USB: serial: mos7840: fix another NULL-deref at open
[pandora-kernel.git] / drivers / usb / serial / mos7840.c
1 /*
2  * This program is free software; you can redistribute it and/or modify
3  * it under the terms of the GNU General Public License as published by
4  * the Free Software Foundation; either version 2 of the License, or
5  * (at your option) any later version.
6  *
7  * This program is distributed in the hope that it will be useful,
8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
10  * GNU General Public License for more details.
11  *
12  * You should have received a copy of the GNU General Public License
13  * along with this program; if not, write to the Free Software
14  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
15  *
16  * Clean ups from Moschip version and a few ioctl implementations by:
17  *      Paul B Schroeder <pschroeder "at" uplogix "dot" com>
18  *
19  * Originally based on drivers/usb/serial/io_edgeport.c which is:
20  *      Copyright (C) 2000 Inside Out Networks, All rights reserved.
21  *      Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
22  *
23  */
24
25 #include <linux/kernel.h>
26 #include <linux/errno.h>
27 #include <linux/init.h>
28 #include <linux/slab.h>
29 #include <linux/tty.h>
30 #include <linux/tty_driver.h>
31 #include <linux/tty_flip.h>
32 #include <linux/module.h>
33 #include <linux/serial.h>
34 #include <linux/usb.h>
35 #include <linux/usb/serial.h>
36 #include <linux/uaccess.h>
37
38 /*
39  * Version Information
40  */
41 #define DRIVER_VERSION "1.3.2"
42 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
43
44 /*
45  * 16C50 UART register defines
46  */
47
48 #define LCR_BITS_5             0x00     /* 5 bits/char */
49 #define LCR_BITS_6             0x01     /* 6 bits/char */
50 #define LCR_BITS_7             0x02     /* 7 bits/char */
51 #define LCR_BITS_8             0x03     /* 8 bits/char */
52 #define LCR_BITS_MASK          0x03     /* Mask for bits/char field */
53
54 #define LCR_STOP_1             0x00     /* 1 stop bit */
55 #define LCR_STOP_1_5           0x04     /* 1.5 stop bits (if 5   bits/char) */
56 #define LCR_STOP_2             0x04     /* 2 stop bits   (if 6-8 bits/char) */
57 #define LCR_STOP_MASK          0x04     /* Mask for stop bits field */
58
59 #define LCR_PAR_NONE           0x00     /* No parity */
60 #define LCR_PAR_ODD            0x08     /* Odd parity */
61 #define LCR_PAR_EVEN           0x18     /* Even parity */
62 #define LCR_PAR_MARK           0x28     /* Force parity bit to 1 */
63 #define LCR_PAR_SPACE          0x38     /* Force parity bit to 0 */
64 #define LCR_PAR_MASK           0x38     /* Mask for parity field */
65
66 #define LCR_SET_BREAK          0x40     /* Set Break condition */
67 #define LCR_DL_ENABLE          0x80     /* Enable access to divisor latch */
68
69 #define MCR_DTR                0x01     /* Assert DTR */
70 #define MCR_RTS                0x02     /* Assert RTS */
71 #define MCR_OUT1               0x04     /* Loopback only: Sets state of RI */
72 #define MCR_MASTER_IE          0x08     /* Enable interrupt outputs */
73 #define MCR_LOOPBACK           0x10     /* Set internal (digital) loopback mode */
74 #define MCR_XON_ANY            0x20     /* Enable any char to exit XOFF mode */
75
76 #define MOS7840_MSR_CTS        0x10     /* Current state of CTS */
77 #define MOS7840_MSR_DSR        0x20     /* Current state of DSR */
78 #define MOS7840_MSR_RI         0x40     /* Current state of RI */
79 #define MOS7840_MSR_CD         0x80     /* Current state of CD */
80
81 /*
82  * Defines used for sending commands to port
83  */
84
85 #define WAIT_FOR_EVER   (HZ * 0)        /* timeout urb is wait for ever */
86 #define MOS_WDR_TIMEOUT (HZ * 5)        /* default urb timeout */
87
88 #define MOS_PORT1       0x0200
89 #define MOS_PORT2       0x0300
90 #define MOS_VENREG      0x0000
91 #define MOS_MAX_PORT    0x02
92 #define MOS_WRITE       0x0E
93 #define MOS_READ        0x0D
94
95 /* Requests */
96 #define MCS_RD_RTYPE    0xC0
97 #define MCS_WR_RTYPE    0x40
98 #define MCS_RDREQ       0x0D
99 #define MCS_WRREQ       0x0E
100 #define MCS_CTRL_TIMEOUT        500
101 #define VENDOR_READ_LENGTH      (0x01)
102
103 #define MAX_NAME_LEN    64
104
105 #define ZLP_REG1  0x3A          /* Zero_Flag_Reg1    58 */
106 #define ZLP_REG5  0x3E          /* Zero_Flag_Reg5    62 */
107
108 /* For higher baud Rates use TIOCEXBAUD */
109 #define TIOCEXBAUD     0x5462
110
111 /* vendor id and device id defines */
112
113 /* The native mos7840/7820 component */
114 #define USB_VENDOR_ID_MOSCHIP           0x9710
115 #define MOSCHIP_DEVICE_ID_7840          0x7840
116 #define MOSCHIP_DEVICE_ID_7820          0x7820
117 /* The native component can have its vendor/device id's overridden
118  * in vendor-specific implementations.  Such devices can be handled
119  * by making a change here, in moschip_port_id_table, and in
120  * moschip_id_table_combined
121  */
122 #define USB_VENDOR_ID_BANDB              0x0856
123 #define BANDB_DEVICE_ID_USO9ML2_2        0xAC22
124 #define BANDB_DEVICE_ID_USO9ML2_2P       0xBC00
125 #define BANDB_DEVICE_ID_USO9ML2_4        0xAC24
126 #define BANDB_DEVICE_ID_USO9ML2_4P       0xBC01
127 #define BANDB_DEVICE_ID_US9ML2_2         0xAC29
128 #define BANDB_DEVICE_ID_US9ML2_4         0xAC30
129 #define BANDB_DEVICE_ID_USPTL4_2         0xAC31
130 #define BANDB_DEVICE_ID_USPTL4_4         0xAC32
131 #define BANDB_DEVICE_ID_USOPTL4_2        0xAC42
132 #define BANDB_DEVICE_ID_USOPTL4_2P       0xBC02
133 #define BANDB_DEVICE_ID_USOPTL4_4        0xAC44
134 #define BANDB_DEVICE_ID_USOPTL4_4P       0xBC03
135 #define BANDB_DEVICE_ID_USOPTL2_4        0xAC24
136
137 /* This driver also supports
138  * ATEN UC2324 device using Moschip MCS7840
139  * ATEN UC2322 device using Moschip MCS7820
140  */
141 #define USB_VENDOR_ID_ATENINTL          0x0557
142 #define ATENINTL_DEVICE_ID_UC2324       0x2011
143 #define ATENINTL_DEVICE_ID_UC2322       0x7820
144
145 /* Interrupt Routine Defines    */
146
147 #define SERIAL_IIR_RLS      0x06
148 #define SERIAL_IIR_MS       0x00
149
150 /*
151  *  Emulation of the bit mask on the LINE STATUS REGISTER.
152  */
153 #define SERIAL_LSR_DR       0x0001
154 #define SERIAL_LSR_OE       0x0002
155 #define SERIAL_LSR_PE       0x0004
156 #define SERIAL_LSR_FE       0x0008
157 #define SERIAL_LSR_BI       0x0010
158
159 #define MOS_MSR_DELTA_CTS   0x10
160 #define MOS_MSR_DELTA_DSR   0x20
161 #define MOS_MSR_DELTA_RI    0x40
162 #define MOS_MSR_DELTA_CD    0x80
163
164 /* Serial Port register Address */
165 #define INTERRUPT_ENABLE_REGISTER  ((__u16)(0x01))
166 #define FIFO_CONTROL_REGISTER      ((__u16)(0x02))
167 #define LINE_CONTROL_REGISTER      ((__u16)(0x03))
168 #define MODEM_CONTROL_REGISTER     ((__u16)(0x04))
169 #define LINE_STATUS_REGISTER       ((__u16)(0x05))
170 #define MODEM_STATUS_REGISTER      ((__u16)(0x06))
171 #define SCRATCH_PAD_REGISTER       ((__u16)(0x07))
172 #define DIVISOR_LATCH_LSB          ((__u16)(0x00))
173 #define DIVISOR_LATCH_MSB          ((__u16)(0x01))
174
175 #define CLK_MULTI_REGISTER         ((__u16)(0x02))
176 #define CLK_START_VALUE_REGISTER   ((__u16)(0x03))
177 #define GPIO_REGISTER              ((__u16)(0x07))
178
179 #define SERIAL_LCR_DLAB            ((__u16)(0x0080))
180
181 /*
182  * URB POOL related defines
183  */
184 #define NUM_URBS                        16      /* URB Count */
185 #define URB_TRANSFER_BUFFER_SIZE        32      /* URB Size  */
186
187
188 enum mos7840_flag {
189         MOS7840_FLAG_CTRL_BUSY,
190 };
191
192 static const struct usb_device_id moschip_port_id_table[] = {
193         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
194         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
195         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
196         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
197         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
198         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
199         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
200         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
201         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
202         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
203         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
204         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
205         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
206         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
207         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
208         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
209         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
210         {}                      /* terminating entry */
211 };
212
213 static const struct usb_device_id moschip_id_table_combined[] __devinitconst = {
214         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
215         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
216         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
217         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
218         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
219         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
220         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
221         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
222         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
223         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
224         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
225         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
226         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
227         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
228         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
229         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
230         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
231         {}                      /* terminating entry */
232 };
233
234 MODULE_DEVICE_TABLE(usb, moschip_id_table_combined);
235
236 /* This structure holds all of the local port information */
237
238 struct moschip_port {
239         int port_num;           /*Actual port number in the device(1,2,etc) */
240         struct urb *write_urb;  /* write URB for this port */
241         struct urb *read_urb;   /* read URB for this port */
242         __u8 shadowLCR;         /* last LCR value received */
243         __u8 shadowMCR;         /* last MCR value received */
244         char open;
245         char open_ports;
246         wait_queue_head_t wait_chase;   /* for handling sleeping while waiting for chase to finish */
247         int delta_msr_cond;
248         struct async_icount icount;
249         struct usb_serial_port *port;   /* loop back to the owner of this object */
250
251         /* Offsets */
252         __u8 SpRegOffset;
253         __u8 ControlRegOffset;
254         __u8 DcrRegOffset;
255         /* for processing control URBS in interrupt context */
256         struct urb *control_urb;
257         struct usb_ctrlrequest *dr;
258         char *ctrl_buf;
259         int MsrLsr;
260
261         spinlock_t pool_lock;
262         struct urb *write_urb_pool[NUM_URBS];
263         char busy[NUM_URBS];
264         bool read_urb_busy;
265
266         unsigned long flags;
267 };
268
269
270 static int debug;
271
272 /*
273  * mos7840_set_reg_sync
274  *      To set the Control register by calling usb_fill_control_urb function
275  *      by passing usb_sndctrlpipe function as parameter.
276  */
277
278 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
279                                 __u16 val)
280 {
281         struct usb_device *dev = port->serial->dev;
282         val = val & 0x00ff;
283         dbg("mos7840_set_reg_sync offset is %x, value %x", reg, val);
284
285         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
286                                MCS_WR_RTYPE, val, reg, NULL, 0,
287                                MOS_WDR_TIMEOUT);
288 }
289
290 /*
291  * mos7840_get_reg_sync
292  *      To set the Uart register by calling usb_fill_control_urb function by
293  *      passing usb_rcvctrlpipe function as parameter.
294  */
295
296 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
297                                 __u16 *val)
298 {
299         struct usb_device *dev = port->serial->dev;
300         int ret = 0;
301         u8 *buf;
302
303         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
304         if (!buf)
305                 return -ENOMEM;
306
307         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
308                               MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
309                               MOS_WDR_TIMEOUT);
310         *val = buf[0];
311         dbg("mos7840_get_reg_sync offset is %x, return val %x", reg, *val);
312
313         kfree(buf);
314         return ret;
315 }
316
317 /*
318  * mos7840_set_uart_reg
319  *      To set the Uart register by calling usb_fill_control_urb function by
320  *      passing usb_sndctrlpipe function as parameter.
321  */
322
323 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
324                                 __u16 val)
325 {
326
327         struct usb_device *dev = port->serial->dev;
328         val = val & 0x00ff;
329         /* For the UART control registers, the application number need
330            to be Or'ed */
331         if (port->serial->num_ports == 4) {
332                 val |= (((__u16) port->number -
333                                 (__u16) (port->serial->minor)) + 1) << 8;
334                 dbg("mos7840_set_uart_reg application number is %x", val);
335         } else {
336                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
337                         val |= (((__u16) port->number -
338                               (__u16) (port->serial->minor)) + 1) << 8;
339                         dbg("mos7840_set_uart_reg application number is %x",
340                             val);
341                 } else {
342                         val |=
343                             (((__u16) port->number -
344                               (__u16) (port->serial->minor)) + 2) << 8;
345                         dbg("mos7840_set_uart_reg application number is %x",
346                             val);
347                 }
348         }
349         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
350                                MCS_WR_RTYPE, val, reg, NULL, 0,
351                                MOS_WDR_TIMEOUT);
352
353 }
354
355 /*
356  * mos7840_get_uart_reg
357  *      To set the Control register by calling usb_fill_control_urb function
358  *      by passing usb_rcvctrlpipe function as parameter.
359  */
360 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
361                                 __u16 *val)
362 {
363         struct usb_device *dev = port->serial->dev;
364         int ret = 0;
365         __u16 Wval;
366         u8 *buf;
367
368         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
369         if (!buf)
370                 return -ENOMEM;
371
372         /* dbg("application number is %4x",
373             (((__u16)port->number - (__u16)(port->serial->minor))+1)<<8); */
374         /* Wval  is same as application number */
375         if (port->serial->num_ports == 4) {
376                 Wval =
377                     (((__u16) port->number - (__u16) (port->serial->minor)) +
378                      1) << 8;
379                 dbg("mos7840_get_uart_reg application number is %x", Wval);
380         } else {
381                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
382                         Wval = (((__u16) port->number -
383                               (__u16) (port->serial->minor)) + 1) << 8;
384                         dbg("mos7840_get_uart_reg application number is %x",
385                             Wval);
386                 } else {
387                         Wval = (((__u16) port->number -
388                               (__u16) (port->serial->minor)) + 2) << 8;
389                         dbg("mos7840_get_uart_reg application number is %x",
390                             Wval);
391                 }
392         }
393         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
394                               MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
395                               MOS_WDR_TIMEOUT);
396         *val = buf[0];
397
398         kfree(buf);
399         return ret;
400 }
401
402 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
403 {
404
405         dbg("***************************************");
406         dbg("SpRegOffset is %2x", mos7840_port->SpRegOffset);
407         dbg("ControlRegOffset is %2x", mos7840_port->ControlRegOffset);
408         dbg("DCRRegOffset is %2x", mos7840_port->DcrRegOffset);
409         dbg("***************************************");
410
411 }
412
413 /************************************************************************/
414 /************************************************************************/
415 /*             I N T E R F A C E   F U N C T I O N S                    */
416 /*             I N T E R F A C E   F U N C T I O N S                    */
417 /************************************************************************/
418 /************************************************************************/
419
420 static inline void mos7840_set_port_private(struct usb_serial_port *port,
421                                             struct moschip_port *data)
422 {
423         usb_set_serial_port_data(port, (void *)data);
424 }
425
426 static inline struct moschip_port *mos7840_get_port_private(struct
427                                                             usb_serial_port
428                                                             *port)
429 {
430         return (struct moschip_port *)usb_get_serial_port_data(port);
431 }
432
433 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
434 {
435         struct moschip_port *mos7840_port;
436         struct async_icount *icount;
437         mos7840_port = port;
438         icount = &mos7840_port->icount;
439         if (new_msr &
440             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
441              MOS_MSR_DELTA_CD)) {
442                 icount = &mos7840_port->icount;
443
444                 /* update input line counters */
445                 if (new_msr & MOS_MSR_DELTA_CTS) {
446                         icount->cts++;
447                         smp_wmb();
448                 }
449                 if (new_msr & MOS_MSR_DELTA_DSR) {
450                         icount->dsr++;
451                         smp_wmb();
452                 }
453                 if (new_msr & MOS_MSR_DELTA_CD) {
454                         icount->dcd++;
455                         smp_wmb();
456                 }
457                 if (new_msr & MOS_MSR_DELTA_RI) {
458                         icount->rng++;
459                         smp_wmb();
460                 }
461
462                 mos7840_port->delta_msr_cond = 1;
463                 wake_up_interruptible(&port->port->delta_msr_wait);
464         }
465 }
466
467 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
468 {
469         struct async_icount *icount;
470
471         dbg("%s - %02x", __func__, new_lsr);
472
473         if (new_lsr & SERIAL_LSR_BI) {
474                 /*
475                  * Parity and Framing errors only count if they
476                  * occur exclusive of a break being
477                  * received.
478                  */
479                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
480         }
481
482         /* update input line counters */
483         icount = &port->icount;
484         if (new_lsr & SERIAL_LSR_BI) {
485                 icount->brk++;
486                 smp_wmb();
487         }
488         if (new_lsr & SERIAL_LSR_OE) {
489                 icount->overrun++;
490                 smp_wmb();
491         }
492         if (new_lsr & SERIAL_LSR_PE) {
493                 icount->parity++;
494                 smp_wmb();
495         }
496         if (new_lsr & SERIAL_LSR_FE) {
497                 icount->frame++;
498                 smp_wmb();
499         }
500 }
501
502 /************************************************************************/
503 /************************************************************************/
504 /*            U S B  C A L L B A C K   F U N C T I O N S                */
505 /*            U S B  C A L L B A C K   F U N C T I O N S                */
506 /************************************************************************/
507 /************************************************************************/
508
509 static void mos7840_control_callback(struct urb *urb)
510 {
511         unsigned char *data;
512         struct moschip_port *mos7840_port;
513         __u8 regval = 0x0;
514         int status = urb->status;
515
516         mos7840_port = urb->context;
517
518         switch (status) {
519         case 0:
520                 /* success */
521                 break;
522         case -ECONNRESET:
523         case -ENOENT:
524         case -ESHUTDOWN:
525                 /* this urb is terminated, clean up */
526                 dbg("%s - urb shutting down with status: %d", __func__,
527                     status);
528                 goto out;
529         default:
530                 dbg("%s - nonzero urb status received: %d", __func__,
531                     status);
532                 goto out;
533         }
534
535         dbg("%s urb buffer size is %d", __func__, urb->actual_length);
536         dbg("%s mos7840_port->MsrLsr is %d port %d", __func__,
537             mos7840_port->MsrLsr, mos7840_port->port_num);
538         data = urb->transfer_buffer;
539         regval = (__u8) data[0];
540         dbg("%s data is %x", __func__, regval);
541         if (mos7840_port->MsrLsr == 0)
542                 mos7840_handle_new_msr(mos7840_port, regval);
543         else if (mos7840_port->MsrLsr == 1)
544                 mos7840_handle_new_lsr(mos7840_port, regval);
545 out:
546         clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mos7840_port->flags);
547 }
548
549 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
550                            __u16 *val)
551 {
552         struct usb_device *dev = mcs->port->serial->dev;
553         struct usb_ctrlrequest *dr = mcs->dr;
554         unsigned char *buffer = mcs->ctrl_buf;
555         int ret;
556
557         if (test_and_set_bit_lock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags))
558                 return -EBUSY;
559
560         dr->bRequestType = MCS_RD_RTYPE;
561         dr->bRequest = MCS_RDREQ;
562         dr->wValue = cpu_to_le16(Wval); /* 0 */
563         dr->wIndex = cpu_to_le16(reg);
564         dr->wLength = cpu_to_le16(2);
565
566         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
567                              (unsigned char *)dr, buffer, 2,
568                              mos7840_control_callback, mcs);
569         mcs->control_urb->transfer_buffer_length = 2;
570         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
571         if (ret)
572                 clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags);
573
574         return ret;
575 }
576
577 /*****************************************************************************
578  * mos7840_interrupt_callback
579  *      this is the callback function for when we have received data on the
580  *      interrupt endpoint.
581  *****************************************************************************/
582
583 static void mos7840_interrupt_callback(struct urb *urb)
584 {
585         int result;
586         int length;
587         struct moschip_port *mos7840_port;
588         struct usb_serial *serial;
589         __u16 Data;
590         unsigned char *data;
591         __u8 sp[5], st;
592         int i, rv = 0;
593         __u16 wval, wreg = 0;
594         int status = urb->status;
595
596         dbg("%s", " : Entering");
597
598         switch (status) {
599         case 0:
600                 /* success */
601                 break;
602         case -ECONNRESET:
603         case -ENOENT:
604         case -ESHUTDOWN:
605                 /* this urb is terminated, clean up */
606                 dbg("%s - urb shutting down with status: %d", __func__,
607                     status);
608                 return;
609         default:
610                 dbg("%s - nonzero urb status received: %d", __func__,
611                     status);
612                 goto exit;
613         }
614
615         length = urb->actual_length;
616         data = urb->transfer_buffer;
617
618         serial = urb->context;
619
620         /* Moschip get 5 bytes
621          * Byte 1 IIR Port 1 (port.number is 0)
622          * Byte 2 IIR Port 2 (port.number is 1)
623          * Byte 3 IIR Port 3 (port.number is 2)
624          * Byte 4 IIR Port 4 (port.number is 3)
625          * Byte 5 FIFO status for both */
626
627         if (length && length > 5) {
628                 dbg("%s", "Wrong data !!!");
629                 return;
630         }
631
632         sp[0] = (__u8) data[0];
633         sp[1] = (__u8) data[1];
634         sp[2] = (__u8) data[2];
635         sp[3] = (__u8) data[3];
636         st = (__u8) data[4];
637
638         for (i = 0; i < serial->num_ports; i++) {
639                 mos7840_port = mos7840_get_port_private(serial->port[i]);
640                 wval =
641                     (((__u16) serial->port[i]->number -
642                       (__u16) (serial->minor)) + 1) << 8;
643                 if (mos7840_port->open) {
644                         if (sp[i] & 0x01) {
645                                 dbg("SP%d No Interrupt !!!", i);
646                         } else {
647                                 switch (sp[i] & 0x0f) {
648                                 case SERIAL_IIR_RLS:
649                                         dbg("Serial Port %d: Receiver status error or ", i);
650                                         dbg("address bit detected in 9-bit mode");
651                                         mos7840_port->MsrLsr = 1;
652                                         wreg = LINE_STATUS_REGISTER;
653                                         break;
654                                 case SERIAL_IIR_MS:
655                                         dbg("Serial Port %d: Modem status change", i);
656                                         mos7840_port->MsrLsr = 0;
657                                         wreg = MODEM_STATUS_REGISTER;
658                                         break;
659                                 }
660                                 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
661                         }
662                 }
663         }
664         if (!(rv < 0))
665                 /* the completion handler for the control urb will resubmit */
666                 return;
667 exit:
668         result = usb_submit_urb(urb, GFP_ATOMIC);
669         if (result) {
670                 dev_err(&urb->dev->dev,
671                         "%s - Error %d submitting interrupt urb\n",
672                         __func__, result);
673         }
674 }
675
676 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
677                                        const char *function)
678 {
679         if (!port) {
680                 dbg("%s - port == NULL", function);
681                 return -1;
682         }
683         if (!port->serial) {
684                 dbg("%s - port->serial == NULL", function);
685                 return -1;
686         }
687
688         return 0;
689 }
690
691 /* Inline functions to check the sanity of a pointer that is passed to us */
692 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
693                                          const char *function)
694 {
695         if (!serial) {
696                 dbg("%s - serial == NULL", function);
697                 return -1;
698         }
699         if (!serial->type) {
700                 dbg("%s - serial->type == NULL!", function);
701                 return -1;
702         }
703
704         return 0;
705 }
706
707 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
708                                                  const char *function)
709 {
710         /* if no port was specified, or it fails a paranoia check */
711         if (!port ||
712             mos7840_port_paranoia_check(port, function) ||
713             mos7840_serial_paranoia_check(port->serial, function)) {
714                 /* then say that we don't have a valid usb_serial thing,
715                  * which will end up genrating -ENODEV return values */
716                 return NULL;
717         }
718
719         return port->serial;
720 }
721
722 /*****************************************************************************
723  * mos7840_bulk_in_callback
724  *      this is the callback function for when we have received data on the
725  *      bulk in endpoint.
726  *****************************************************************************/
727
728 static void mos7840_bulk_in_callback(struct urb *urb)
729 {
730         int retval;
731         unsigned char *data;
732         struct usb_serial *serial;
733         struct usb_serial_port *port;
734         struct moschip_port *mos7840_port;
735         struct tty_struct *tty;
736         int status = urb->status;
737
738         mos7840_port = urb->context;
739         if (!mos7840_port) {
740                 dbg("%s", "NULL mos7840_port pointer");
741                 return;
742         }
743
744         if (status) {
745                 dbg("nonzero read bulk status received: %d", status);
746                 mos7840_port->read_urb_busy = false;
747                 return;
748         }
749
750         port = (struct usb_serial_port *)mos7840_port->port;
751         if (mos7840_port_paranoia_check(port, __func__)) {
752                 dbg("%s", "Port Paranoia failed");
753                 mos7840_port->read_urb_busy = false;
754                 return;
755         }
756
757         serial = mos7840_get_usb_serial(port, __func__);
758         if (!serial) {
759                 dbg("%s", "Bad serial pointer");
760                 mos7840_port->read_urb_busy = false;
761                 return;
762         }
763
764         dbg("%s", "Entering... ");
765
766         data = urb->transfer_buffer;
767
768         dbg("%s", "Entering ...........");
769
770         if (urb->actual_length) {
771                 tty = tty_port_tty_get(&mos7840_port->port->port);
772                 if (tty) {
773                         tty_insert_flip_string(tty, data, urb->actual_length);
774                         dbg(" %s ", data);
775                         tty_flip_buffer_push(tty);
776                         tty_kref_put(tty);
777                 }
778                 mos7840_port->icount.rx += urb->actual_length;
779                 smp_wmb();
780                 dbg("mos7840_port->icount.rx is %d:",
781                     mos7840_port->icount.rx);
782         }
783
784         if (!mos7840_port->read_urb) {
785                 dbg("%s", "URB KILLED !!!");
786                 mos7840_port->read_urb_busy = false;
787                 return;
788         }
789
790
791         mos7840_port->read_urb->dev = serial->dev;
792
793         mos7840_port->read_urb_busy = true;
794         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
795
796         if (retval) {
797                 dbg("usb_submit_urb(read bulk) failed, retval = %d", retval);
798                 mos7840_port->read_urb_busy = false;
799         }
800 }
801
802 /*****************************************************************************
803  * mos7840_bulk_out_data_callback
804  *      this is the callback function for when we have finished sending
805  *      serial data on the bulk out endpoint.
806  *****************************************************************************/
807
808 static void mos7840_bulk_out_data_callback(struct urb *urb)
809 {
810         struct moschip_port *mos7840_port;
811         struct tty_struct *tty;
812         int status = urb->status;
813         int i;
814
815         mos7840_port = urb->context;
816         spin_lock(&mos7840_port->pool_lock);
817         for (i = 0; i < NUM_URBS; i++) {
818                 if (urb == mos7840_port->write_urb_pool[i]) {
819                         mos7840_port->busy[i] = 0;
820                         break;
821                 }
822         }
823         spin_unlock(&mos7840_port->pool_lock);
824
825         if (status) {
826                 dbg("nonzero write bulk status received:%d", status);
827                 return;
828         }
829
830         if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
831                 dbg("%s", "Port Paranoia failed");
832                 return;
833         }
834
835         dbg("%s", "Entering .........");
836
837         tty = tty_port_tty_get(&mos7840_port->port->port);
838         if (tty && mos7840_port->open)
839                 tty_wakeup(tty);
840         tty_kref_put(tty);
841
842 }
843
844 /************************************************************************/
845 /*       D R I V E R  T T Y  I N T E R F A C E  F U N C T I O N S       */
846 /************************************************************************/
847 #ifdef MCSSerialProbe
848 static int mos7840_serial_probe(struct usb_serial *serial,
849                                 const struct usb_device_id *id)
850 {
851
852         /*need to implement the mode_reg reading and updating\
853            structures usb_serial_ device_type\
854            (i.e num_ports, num_bulkin,bulkout etc) */
855         /* Also we can update the changes  attach */
856         return 1;
857 }
858 #endif
859
860 /*****************************************************************************
861  * mos7840_open
862  *      this function is called by the tty driver when a port is opened
863  *      If successful, we return 0
864  *      Otherwise we return a negative error number.
865  *****************************************************************************/
866
867 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
868 {
869         int response;
870         int j;
871         struct usb_serial *serial;
872         struct urb *urb;
873         __u16 Data;
874         int status;
875         struct moschip_port *mos7840_port;
876         struct moschip_port *port0;
877
878         dbg ("%s enter", __func__);
879
880         if (mos7840_port_paranoia_check(port, __func__)) {
881                 dbg("%s", "Port Paranoia failed");
882                 return -ENODEV;
883         }
884
885         serial = port->serial;
886
887         if (mos7840_serial_paranoia_check(serial, __func__)) {
888                 dbg("%s", "Serial Paranoia failed");
889                 return -ENODEV;
890         }
891
892         mos7840_port = mos7840_get_port_private(port);
893         port0 = mos7840_get_port_private(serial->port[0]);
894
895         if (mos7840_port == NULL || port0 == NULL)
896                 return -ENODEV;
897
898         usb_clear_halt(serial->dev, port->write_urb->pipe);
899         usb_clear_halt(serial->dev, port->read_urb->pipe);
900         port0->open_ports++;
901
902         /* Initialising the write urb pool */
903         for (j = 0; j < NUM_URBS; ++j) {
904                 urb = usb_alloc_urb(0, GFP_KERNEL);
905                 mos7840_port->write_urb_pool[j] = urb;
906
907                 if (urb == NULL) {
908                         dev_err(&port->dev, "No more urbs???\n");
909                         continue;
910                 }
911
912                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
913                                                                 GFP_KERNEL);
914                 if (!urb->transfer_buffer) {
915                         usb_free_urb(urb);
916                         mos7840_port->write_urb_pool[j] = NULL;
917                         dev_err(&port->dev,
918                                 "%s-out of memory for urb buffers.\n",
919                                 __func__);
920                         continue;
921                 }
922         }
923
924 /*****************************************************************************
925  * Initialize MCS7840 -- Write Init values to corresponding Registers
926  *
927  * Register Index
928  * 1 : IER
929  * 2 : FCR
930  * 3 : LCR
931  * 4 : MCR
932  *
933  * 0x08 : SP1/2 Control Reg
934  *****************************************************************************/
935
936         /* NEED to check the following Block */
937
938         Data = 0x0;
939         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
940         if (status < 0) {
941                 dbg("Reading Spreg failed");
942                 goto err;
943         }
944         Data |= 0x80;
945         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
946         if (status < 0) {
947                 dbg("writing Spreg failed");
948                 goto err;
949         }
950
951         Data &= ~0x80;
952         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
953         if (status < 0) {
954                 dbg("writing Spreg failed");
955                 goto err;
956         }
957         /* End of block to be checked */
958
959         Data = 0x0;
960         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
961                                                                         &Data);
962         if (status < 0) {
963                 dbg("Reading Controlreg failed");
964                 goto err;
965         }
966         Data |= 0x08;           /* Driver done bit */
967         Data |= 0x20;           /* rx_disable */
968         status = mos7840_set_reg_sync(port,
969                                 mos7840_port->ControlRegOffset, Data);
970         if (status < 0) {
971                 dbg("writing Controlreg failed");
972                 goto err;
973         }
974         /* do register settings here */
975         /* Set all regs to the device default values. */
976         /***********************************
977          * First Disable all interrupts.
978          ***********************************/
979         Data = 0x00;
980         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
981         if (status < 0) {
982                 dbg("disabling interrupts failed");
983                 goto err;
984         }
985         /* Set FIFO_CONTROL_REGISTER to the default value */
986         Data = 0x00;
987         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
988         if (status < 0) {
989                 dbg("Writing FIFO_CONTROL_REGISTER  failed");
990                 goto err;
991         }
992
993         Data = 0xcf;
994         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
995         if (status < 0) {
996                 dbg("Writing FIFO_CONTROL_REGISTER  failed");
997                 goto err;
998         }
999
1000         Data = 0x03;
1001         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1002         mos7840_port->shadowLCR = Data;
1003
1004         Data = 0x0b;
1005         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1006         mos7840_port->shadowMCR = Data;
1007
1008         Data = 0x00;
1009         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1010         mos7840_port->shadowLCR = Data;
1011
1012         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1013         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1014
1015         Data = 0x0c;
1016         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1017
1018         Data = 0x0;
1019         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1020
1021         Data = 0x00;
1022         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1023
1024         Data = Data & ~SERIAL_LCR_DLAB;
1025         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1026         mos7840_port->shadowLCR = Data;
1027
1028         /* clearing Bulkin and Bulkout Fifo */
1029         Data = 0x0;
1030         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
1031
1032         Data = Data | 0x0c;
1033         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1034
1035         Data = Data & ~0x0c;
1036         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1037         /* Finally enable all interrupts */
1038         Data = 0x0c;
1039         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1040
1041         /* clearing rx_disable */
1042         Data = 0x0;
1043         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1044                                                                         &Data);
1045         Data = Data & ~0x20;
1046         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1047                                                                         Data);
1048
1049         /* rx_negate */
1050         Data = 0x0;
1051         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1052                                                                         &Data);
1053         Data = Data | 0x10;
1054         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1055                                                                         Data);
1056
1057         /* Check to see if we've set up our endpoint info yet    *
1058          * (can't set it up in mos7840_startup as the structures *
1059          * were not set up at that time.)                        */
1060         if (port0->open_ports == 1) {
1061                 /* FIXME: Buffer never NULL, so URB is not submitted. */
1062                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1063                         /* set up interrupt urb */
1064                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1065                                 serial->dev,
1066                                 usb_rcvintpipe(serial->dev,
1067                                 serial->port[0]->interrupt_in_endpointAddress),
1068                                 serial->port[0]->interrupt_in_buffer,
1069                                 serial->port[0]->interrupt_in_urb->
1070                                 transfer_buffer_length,
1071                                 mos7840_interrupt_callback,
1072                                 serial,
1073                                 serial->port[0]->interrupt_in_urb->interval);
1074
1075                         /* start interrupt read for mos7840 */
1076                         response =
1077                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1078                                            GFP_KERNEL);
1079                         if (response) {
1080                                 dev_err(&port->dev, "%s - Error %d submitting "
1081                                         "interrupt urb\n", __func__, response);
1082                         }
1083
1084                 }
1085
1086         }
1087
1088         /* see if we've set up our endpoint info yet   *
1089          * (can't set it up in mos7840_startup as the  *
1090          * structures were not set up at that time.)   */
1091
1092         dbg("port number is %d", port->number);
1093         dbg("serial number is %d", port->serial->minor);
1094         dbg("Bulkin endpoint is %d", port->bulk_in_endpointAddress);
1095         dbg("BulkOut endpoint is %d", port->bulk_out_endpointAddress);
1096         dbg("Interrupt endpoint is %d", port->interrupt_in_endpointAddress);
1097         dbg("port's number in the device is %d", mos7840_port->port_num);
1098         mos7840_port->read_urb = port->read_urb;
1099
1100         /* set up our bulk in urb */
1101         if ((serial->num_ports == 2)
1102                 && ((((__u16)port->number -
1103                         (__u16)(port->serial->minor)) % 2) != 0)) {
1104                 usb_fill_bulk_urb(mos7840_port->read_urb,
1105                         serial->dev,
1106                         usb_rcvbulkpipe(serial->dev,
1107                                 (port->bulk_in_endpointAddress) + 2),
1108                         port->bulk_in_buffer,
1109                         mos7840_port->read_urb->transfer_buffer_length,
1110                         mos7840_bulk_in_callback, mos7840_port);
1111         } else {
1112                 usb_fill_bulk_urb(mos7840_port->read_urb,
1113                         serial->dev,
1114                         usb_rcvbulkpipe(serial->dev,
1115                                 port->bulk_in_endpointAddress),
1116                         port->bulk_in_buffer,
1117                         mos7840_port->read_urb->transfer_buffer_length,
1118                         mos7840_bulk_in_callback, mos7840_port);
1119         }
1120
1121         dbg("mos7840_open: bulkin endpoint is %d",
1122             port->bulk_in_endpointAddress);
1123         mos7840_port->read_urb_busy = true;
1124         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1125         if (response) {
1126                 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1127                         __func__, response);
1128                 mos7840_port->read_urb_busy = false;
1129         }
1130
1131         /* initialize our wait queues */
1132         init_waitqueue_head(&mos7840_port->wait_chase);
1133
1134         /* initialize our icount structure */
1135         memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1136
1137         /* initialize our port settings */
1138         /* Must set to enable ints! */
1139         mos7840_port->shadowMCR = MCR_MASTER_IE;
1140         /* send a open port command */
1141         mos7840_port->open = 1;
1142         /* mos7840_change_port_settings(mos7840_port,old_termios); */
1143         mos7840_port->icount.tx = 0;
1144         mos7840_port->icount.rx = 0;
1145
1146         dbg("usb_serial serial:%p       mos7840_port:%p\n      usb_serial_port port:%p",
1147                                 serial, mos7840_port, port);
1148
1149         dbg ("%s leave", __func__);
1150
1151         return 0;
1152 err:
1153         for (j = 0; j < NUM_URBS; ++j) {
1154                 urb = mos7840_port->write_urb_pool[j];
1155                 if (!urb)
1156                         continue;
1157                 kfree(urb->transfer_buffer);
1158                 usb_free_urb(urb);
1159         }
1160         return status;
1161 }
1162
1163 /*****************************************************************************
1164  * mos7840_chars_in_buffer
1165  *      this function is called by the tty driver when it wants to know how many
1166  *      bytes of data we currently have outstanding in the port (data that has
1167  *      been written, but hasn't made it out the port yet)
1168  *      If successful, we return the number of bytes left to be written in the
1169  *      system,
1170  *      Otherwise we return zero.
1171  *****************************************************************************/
1172
1173 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1174 {
1175         struct usb_serial_port *port = tty->driver_data;
1176         int i;
1177         int chars = 0;
1178         unsigned long flags;
1179         struct moschip_port *mos7840_port;
1180
1181         dbg("%s", " mos7840_chars_in_buffer:entering ...........");
1182
1183         if (mos7840_port_paranoia_check(port, __func__)) {
1184                 dbg("%s", "Invalid port");
1185                 return 0;
1186         }
1187
1188         mos7840_port = mos7840_get_port_private(port);
1189         if (mos7840_port == NULL) {
1190                 dbg("%s", "mos7840_break:leaving ...........");
1191                 return 0;
1192         }
1193
1194         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1195         for (i = 0; i < NUM_URBS; ++i) {
1196                 if (mos7840_port->busy[i]) {
1197                         struct urb *urb = mos7840_port->write_urb_pool[i];
1198                         chars += urb->transfer_buffer_length;
1199                 }
1200         }
1201         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1202         dbg("%s - returns %d", __func__, chars);
1203         return chars;
1204
1205 }
1206
1207 /*****************************************************************************
1208  * mos7840_close
1209  *      this function is called by the tty driver when a port is closed
1210  *****************************************************************************/
1211
1212 static void mos7840_close(struct usb_serial_port *port)
1213 {
1214         struct usb_serial *serial;
1215         struct moschip_port *mos7840_port;
1216         struct moschip_port *port0;
1217         int j;
1218         __u16 Data;
1219
1220         dbg("%s", "mos7840_close:entering...");
1221
1222         if (mos7840_port_paranoia_check(port, __func__)) {
1223                 dbg("%s", "Port Paranoia failed");
1224                 return;
1225         }
1226
1227         serial = mos7840_get_usb_serial(port, __func__);
1228         if (!serial) {
1229                 dbg("%s", "Serial Paranoia failed");
1230                 return;
1231         }
1232
1233         mos7840_port = mos7840_get_port_private(port);
1234         port0 = mos7840_get_port_private(serial->port[0]);
1235
1236         if (mos7840_port == NULL || port0 == NULL)
1237                 return;
1238
1239         for (j = 0; j < NUM_URBS; ++j)
1240                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1241
1242         /* Freeing Write URBs */
1243         for (j = 0; j < NUM_URBS; ++j) {
1244                 if (mos7840_port->write_urb_pool[j]) {
1245                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1246                                 kfree(mos7840_port->write_urb_pool[j]->
1247                                       transfer_buffer);
1248
1249                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1250                 }
1251         }
1252
1253         /* While closing port, shutdown all bulk read, write  *
1254          * and interrupt read if they exists                  */
1255         if (serial->dev) {
1256                 if (mos7840_port->write_urb) {
1257                         dbg("%s", "Shutdown bulk write");
1258                         usb_kill_urb(mos7840_port->write_urb);
1259                 }
1260                 if (mos7840_port->read_urb) {
1261                         dbg("%s", "Shutdown bulk read");
1262                         usb_kill_urb(mos7840_port->read_urb);
1263                         mos7840_port->read_urb_busy = false;
1264                 }
1265                 if ((&mos7840_port->control_urb)) {
1266                         dbg("%s", "Shutdown control read");
1267                         /*/      usb_kill_urb (mos7840_port->control_urb); */
1268                 }
1269         }
1270 /*      if(mos7840_port->ctrl_buf != NULL) */
1271 /*              kfree(mos7840_port->ctrl_buf); */
1272         port0->open_ports--;
1273         dbg("mos7840_num_open_ports in close%d:in port%d",
1274             port0->open_ports, port->number);
1275         if (port0->open_ports == 0) {
1276                 if (serial->port[0]->interrupt_in_urb) {
1277                         dbg("%s", "Shutdown interrupt_in_urb");
1278                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1279                 }
1280         }
1281
1282         if (mos7840_port->write_urb) {
1283                 /* if this urb had a transfer buffer already (old tx) free it */
1284                 if (mos7840_port->write_urb->transfer_buffer != NULL)
1285                         kfree(mos7840_port->write_urb->transfer_buffer);
1286                 usb_free_urb(mos7840_port->write_urb);
1287         }
1288
1289         Data = 0x0;
1290         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1291
1292         Data = 0x00;
1293         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1294
1295         mos7840_port->open = 0;
1296
1297         dbg("%s", "Leaving ............");
1298 }
1299
1300 /************************************************************************
1301  *
1302  * mos7840_block_until_chase_response
1303  *
1304  *      This function will block the close until one of the following:
1305  *              1. Response to our Chase comes from mos7840
1306  *              2. A timeout of 10 seconds without activity has expired
1307  *                 (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1308  *
1309  ************************************************************************/
1310
1311 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1312                                         struct moschip_port *mos7840_port)
1313 {
1314         int timeout = 1 * HZ;
1315         int wait = 10;
1316         int count;
1317
1318         while (1) {
1319                 count = mos7840_chars_in_buffer(tty);
1320
1321                 /* Check for Buffer status */
1322                 if (count <= 0)
1323                         return;
1324
1325                 /* Block the thread for a while */
1326                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1327                                                timeout);
1328                 /* No activity.. count down section */
1329                 wait--;
1330                 if (wait == 0) {
1331                         dbg("%s - TIMEOUT", __func__);
1332                         return;
1333                 } else {
1334                         /* Reset timeout value back to seconds */
1335                         wait = 10;
1336                 }
1337         }
1338
1339 }
1340
1341 /*****************************************************************************
1342  * mos7840_break
1343  *      this function sends a break to the port
1344  *****************************************************************************/
1345 static void mos7840_break(struct tty_struct *tty, int break_state)
1346 {
1347         struct usb_serial_port *port = tty->driver_data;
1348         unsigned char data;
1349         struct usb_serial *serial;
1350         struct moschip_port *mos7840_port;
1351
1352         dbg("%s", "Entering ...........");
1353         dbg("mos7840_break: Start");
1354
1355         if (mos7840_port_paranoia_check(port, __func__)) {
1356                 dbg("%s", "Port Paranoia failed");
1357                 return;
1358         }
1359
1360         serial = mos7840_get_usb_serial(port, __func__);
1361         if (!serial) {
1362                 dbg("%s", "Serial Paranoia failed");
1363                 return;
1364         }
1365
1366         mos7840_port = mos7840_get_port_private(port);
1367
1368         if (mos7840_port == NULL)
1369                 return;
1370
1371         if (serial->dev)
1372                 /* flush and block until tx is empty */
1373                 mos7840_block_until_chase_response(tty, mos7840_port);
1374
1375         if (break_state == -1)
1376                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1377         else
1378                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1379
1380         /* FIXME: no locking on shadowLCR anywhere in driver */
1381         mos7840_port->shadowLCR = data;
1382         dbg("mcs7840_break mos7840_port->shadowLCR is %x",
1383             mos7840_port->shadowLCR);
1384         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1385                              mos7840_port->shadowLCR);
1386 }
1387
1388 /*****************************************************************************
1389  * mos7840_write_room
1390  *      this function is called by the tty driver when it wants to know how many
1391  *      bytes of data we can accept for a specific port.
1392  *      If successful, we return the amount of room that we have for this port
1393  *      Otherwise we return a negative error number.
1394  *****************************************************************************/
1395
1396 static int mos7840_write_room(struct tty_struct *tty)
1397 {
1398         struct usb_serial_port *port = tty->driver_data;
1399         int i;
1400         int room = 0;
1401         unsigned long flags;
1402         struct moschip_port *mos7840_port;
1403
1404         dbg("%s", " mos7840_write_room:entering ...........");
1405
1406         if (mos7840_port_paranoia_check(port, __func__)) {
1407                 dbg("%s", "Invalid port");
1408                 dbg("%s", " mos7840_write_room:leaving ...........");
1409                 return -1;
1410         }
1411
1412         mos7840_port = mos7840_get_port_private(port);
1413         if (mos7840_port == NULL) {
1414                 dbg("%s", "mos7840_break:leaving ...........");
1415                 return -1;
1416         }
1417
1418         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1419         for (i = 0; i < NUM_URBS; ++i) {
1420                 if (!mos7840_port->busy[i])
1421                         room += URB_TRANSFER_BUFFER_SIZE;
1422         }
1423         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1424
1425         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1426         dbg("%s - returns %d", __func__, room);
1427         return room;
1428
1429 }
1430
1431 /*****************************************************************************
1432  * mos7840_write
1433  *      this function is called by the tty driver when data should be written to
1434  *      the port.
1435  *      If successful, we return the number of bytes written, otherwise we
1436  *      return a negative error number.
1437  *****************************************************************************/
1438
1439 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1440                          const unsigned char *data, int count)
1441 {
1442         int status;
1443         int i;
1444         int bytes_sent = 0;
1445         int transfer_size;
1446         unsigned long flags;
1447
1448         struct moschip_port *mos7840_port;
1449         struct usb_serial *serial;
1450         struct urb *urb;
1451         /* __u16 Data; */
1452         const unsigned char *current_position = data;
1453         unsigned char *data1;
1454         dbg("%s", "entering ...........");
1455         /* dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1456                                         mos7840_port->shadowLCR); */
1457
1458 #ifdef NOTMOS7840
1459         Data = 0x00;
1460         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1461         mos7840_port->shadowLCR = Data;
1462         dbg("mos7840_write: LINE_CONTROL_REGISTER is %x", Data);
1463         dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1464             mos7840_port->shadowLCR);
1465
1466         /* Data = 0x03; */
1467         /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1468         /* mos7840_port->shadowLCR=Data;//Need to add later */
1469
1470         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1471         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1472
1473         /* Data = 0x0c; */
1474         /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1475         Data = 0x00;
1476         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1477         dbg("mos7840_write:DLL value is %x", Data);
1478
1479         Data = 0x0;
1480         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1481         dbg("mos7840_write:DLM value is %x", Data);
1482
1483         Data = Data & ~SERIAL_LCR_DLAB;
1484         dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1485             mos7840_port->shadowLCR);
1486         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1487 #endif
1488
1489         if (mos7840_port_paranoia_check(port, __func__)) {
1490                 dbg("%s", "Port Paranoia failed");
1491                 return -1;
1492         }
1493
1494         serial = port->serial;
1495         if (mos7840_serial_paranoia_check(serial, __func__)) {
1496                 dbg("%s", "Serial Paranoia failed");
1497                 return -1;
1498         }
1499
1500         mos7840_port = mos7840_get_port_private(port);
1501         if (mos7840_port == NULL) {
1502                 dbg("%s", "mos7840_port is NULL");
1503                 return -1;
1504         }
1505
1506         /* try to find a free urb in the list */
1507         urb = NULL;
1508
1509         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1510         for (i = 0; i < NUM_URBS; ++i) {
1511                 if (!mos7840_port->busy[i]) {
1512                         mos7840_port->busy[i] = 1;
1513                         urb = mos7840_port->write_urb_pool[i];
1514                         dbg("URB:%d", i);
1515                         break;
1516                 }
1517         }
1518         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1519
1520         if (urb == NULL) {
1521                 dbg("%s - no more free urbs", __func__);
1522                 goto exit;
1523         }
1524
1525         if (urb->transfer_buffer == NULL) {
1526                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1527                                                GFP_ATOMIC);
1528
1529                 if (urb->transfer_buffer == NULL) {
1530                         dev_err(&port->dev, "%s no more kernel memory...\n",
1531                                 __func__);
1532                         goto exit;
1533                 }
1534         }
1535         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1536
1537         memcpy(urb->transfer_buffer, current_position, transfer_size);
1538
1539         /* fill urb with data and submit  */
1540         if ((serial->num_ports == 2)
1541                 && ((((__u16)port->number -
1542                         (__u16)(port->serial->minor)) % 2) != 0)) {
1543                 usb_fill_bulk_urb(urb,
1544                         serial->dev,
1545                         usb_sndbulkpipe(serial->dev,
1546                                 (port->bulk_out_endpointAddress) + 2),
1547                         urb->transfer_buffer,
1548                         transfer_size,
1549                         mos7840_bulk_out_data_callback, mos7840_port);
1550         } else {
1551                 usb_fill_bulk_urb(urb,
1552                         serial->dev,
1553                         usb_sndbulkpipe(serial->dev,
1554                                 port->bulk_out_endpointAddress),
1555                         urb->transfer_buffer,
1556                         transfer_size,
1557                         mos7840_bulk_out_data_callback, mos7840_port);
1558         }
1559
1560         data1 = urb->transfer_buffer;
1561         dbg("bulkout endpoint is %d", port->bulk_out_endpointAddress);
1562
1563         /* send it down the pipe */
1564         status = usb_submit_urb(urb, GFP_ATOMIC);
1565
1566         if (status) {
1567                 mos7840_port->busy[i] = 0;
1568                 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
1569                         "with status = %d\n", __func__, status);
1570                 bytes_sent = status;
1571                 goto exit;
1572         }
1573         bytes_sent = transfer_size;
1574         mos7840_port->icount.tx += transfer_size;
1575         smp_wmb();
1576         dbg("mos7840_port->icount.tx is %d:", mos7840_port->icount.tx);
1577 exit:
1578         return bytes_sent;
1579
1580 }
1581
1582 /*****************************************************************************
1583  * mos7840_throttle
1584  *      this function is called by the tty driver when it wants to stop the data
1585  *      being read from the port.
1586  *****************************************************************************/
1587
1588 static void mos7840_throttle(struct tty_struct *tty)
1589 {
1590         struct usb_serial_port *port = tty->driver_data;
1591         struct moschip_port *mos7840_port;
1592         int status;
1593
1594         if (mos7840_port_paranoia_check(port, __func__)) {
1595                 dbg("%s", "Invalid port");
1596                 return;
1597         }
1598
1599         dbg("- port %d", port->number);
1600
1601         mos7840_port = mos7840_get_port_private(port);
1602
1603         if (mos7840_port == NULL)
1604                 return;
1605
1606         if (!mos7840_port->open) {
1607                 dbg("%s", "port not opened");
1608                 return;
1609         }
1610
1611         dbg("%s", "Entering ..........");
1612
1613         /* if we are implementing XON/XOFF, send the stop character */
1614         if (I_IXOFF(tty)) {
1615                 unsigned char stop_char = STOP_CHAR(tty);
1616                 status = mos7840_write(tty, port, &stop_char, 1);
1617                 if (status <= 0)
1618                         return;
1619         }
1620         /* if we are implementing RTS/CTS, toggle that line */
1621         if (tty->termios->c_cflag & CRTSCTS) {
1622                 mos7840_port->shadowMCR &= ~MCR_RTS;
1623                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1624                                          mos7840_port->shadowMCR);
1625                 if (status < 0)
1626                         return;
1627         }
1628 }
1629
1630 /*****************************************************************************
1631  * mos7840_unthrottle
1632  *      this function is called by the tty driver when it wants to resume
1633  *      the data being read from the port (called after mos7840_throttle is
1634  *      called)
1635  *****************************************************************************/
1636 static void mos7840_unthrottle(struct tty_struct *tty)
1637 {
1638         struct usb_serial_port *port = tty->driver_data;
1639         int status;
1640         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1641
1642         if (mos7840_port_paranoia_check(port, __func__)) {
1643                 dbg("%s", "Invalid port");
1644                 return;
1645         }
1646
1647         if (mos7840_port == NULL)
1648                 return;
1649
1650         if (!mos7840_port->open) {
1651                 dbg("%s - port not opened", __func__);
1652                 return;
1653         }
1654
1655         dbg("%s", "Entering ..........");
1656
1657         /* if we are implementing XON/XOFF, send the start character */
1658         if (I_IXOFF(tty)) {
1659                 unsigned char start_char = START_CHAR(tty);
1660                 status = mos7840_write(tty, port, &start_char, 1);
1661                 if (status <= 0)
1662                         return;
1663         }
1664
1665         /* if we are implementing RTS/CTS, toggle that line */
1666         if (tty->termios->c_cflag & CRTSCTS) {
1667                 mos7840_port->shadowMCR |= MCR_RTS;
1668                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1669                                          mos7840_port->shadowMCR);
1670                 if (status < 0)
1671                         return;
1672         }
1673 }
1674
1675 static int mos7840_tiocmget(struct tty_struct *tty)
1676 {
1677         struct usb_serial_port *port = tty->driver_data;
1678         struct moschip_port *mos7840_port;
1679         unsigned int result;
1680         __u16 msr;
1681         __u16 mcr;
1682         int status;
1683         mos7840_port = mos7840_get_port_private(port);
1684
1685         dbg("%s - port %d", __func__, port->number);
1686
1687         if (mos7840_port == NULL)
1688                 return -ENODEV;
1689
1690         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1691         if (status != 1)
1692                 return -EIO;
1693         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1694         if (status != 1)
1695                 return -EIO;
1696         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1697             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1698             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1699             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1700             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1701             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1702             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1703
1704         dbg("%s - 0x%04X", __func__, result);
1705
1706         return result;
1707 }
1708
1709 static int mos7840_tiocmset(struct tty_struct *tty,
1710                             unsigned int set, unsigned int clear)
1711 {
1712         struct usb_serial_port *port = tty->driver_data;
1713         struct moschip_port *mos7840_port;
1714         unsigned int mcr;
1715         int status;
1716
1717         dbg("%s - port %d", __func__, port->number);
1718
1719         mos7840_port = mos7840_get_port_private(port);
1720
1721         if (mos7840_port == NULL)
1722                 return -ENODEV;
1723
1724         /* FIXME: What locks the port registers ? */
1725         mcr = mos7840_port->shadowMCR;
1726         if (clear & TIOCM_RTS)
1727                 mcr &= ~MCR_RTS;
1728         if (clear & TIOCM_DTR)
1729                 mcr &= ~MCR_DTR;
1730         if (clear & TIOCM_LOOP)
1731                 mcr &= ~MCR_LOOPBACK;
1732
1733         if (set & TIOCM_RTS)
1734                 mcr |= MCR_RTS;
1735         if (set & TIOCM_DTR)
1736                 mcr |= MCR_DTR;
1737         if (set & TIOCM_LOOP)
1738                 mcr |= MCR_LOOPBACK;
1739
1740         mos7840_port->shadowMCR = mcr;
1741
1742         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1743         if (status < 0) {
1744                 dbg("setting MODEM_CONTROL_REGISTER Failed");
1745                 return status;
1746         }
1747
1748         return 0;
1749 }
1750
1751 /*****************************************************************************
1752  * mos7840_calc_baud_rate_divisor
1753  *      this function calculates the proper baud rate divisor for the specified
1754  *      baud rate.
1755  *****************************************************************************/
1756 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1757                                           __u16 *clk_sel_val)
1758 {
1759
1760         dbg("%s - %d", __func__, baudRate);
1761
1762         if (baudRate <= 115200) {
1763                 *divisor = 115200 / baudRate;
1764                 *clk_sel_val = 0x0;
1765         }
1766         if ((baudRate > 115200) && (baudRate <= 230400)) {
1767                 *divisor = 230400 / baudRate;
1768                 *clk_sel_val = 0x10;
1769         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1770                 *divisor = 403200 / baudRate;
1771                 *clk_sel_val = 0x20;
1772         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1773                 *divisor = 460800 / baudRate;
1774                 *clk_sel_val = 0x30;
1775         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1776                 *divisor = 806400 / baudRate;
1777                 *clk_sel_val = 0x40;
1778         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1779                 *divisor = 921600 / baudRate;
1780                 *clk_sel_val = 0x50;
1781         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1782                 *divisor = 1572864 / baudRate;
1783                 *clk_sel_val = 0x60;
1784         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1785                 *divisor = 3145728 / baudRate;
1786                 *clk_sel_val = 0x70;
1787         }
1788         return 0;
1789
1790 #ifdef NOTMCS7840
1791
1792         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1793                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1794                         *divisor = mos7840_divisor_table[i].Divisor;
1795                         return 0;
1796                 }
1797         }
1798
1799         /* After trying for all the standard baud rates    *
1800          * Try calculating the divisor for this baud rate  */
1801
1802         if (baudrate > 75 && baudrate < 230400) {
1803                 /* get the divisor */
1804                 custom = (__u16) (230400L / baudrate);
1805
1806                 /* Check for round off */
1807                 round1 = (__u16) (2304000L / baudrate);
1808                 round = (__u16) (round1 - (custom * 10));
1809                 if (round > 4)
1810                         custom++;
1811                 *divisor = custom;
1812
1813                 dbg(" Baud %d = %d", baudrate, custom);
1814                 return 0;
1815         }
1816
1817         dbg("%s", " Baud calculation Failed...");
1818         return -1;
1819 #endif
1820 }
1821
1822 /*****************************************************************************
1823  * mos7840_send_cmd_write_baud_rate
1824  *      this function sends the proper command to change the baud rate of the
1825  *      specified port.
1826  *****************************************************************************/
1827
1828 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1829                                             int baudRate)
1830 {
1831         int divisor = 0;
1832         int status;
1833         __u16 Data;
1834         unsigned char number;
1835         __u16 clk_sel_val;
1836         struct usb_serial_port *port;
1837
1838         if (mos7840_port == NULL)
1839                 return -1;
1840
1841         port = (struct usb_serial_port *)mos7840_port->port;
1842         if (mos7840_port_paranoia_check(port, __func__)) {
1843                 dbg("%s", "Invalid port");
1844                 return -1;
1845         }
1846
1847         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1848                 dbg("%s", "Invalid Serial");
1849                 return -1;
1850         }
1851
1852         dbg("%s", "Entering ..........");
1853
1854         number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1855
1856         dbg("%s - port = %d, baud = %d", __func__,
1857             mos7840_port->port->number, baudRate);
1858         /* reset clk_uart_sel in spregOffset */
1859         if (baudRate > 115200) {
1860 #ifdef HW_flow_control
1861                 /* NOTE: need to see the pther register to modify */
1862                 /* setting h/w flow control bit to 1 */
1863                 Data = 0x2b;
1864                 mos7840_port->shadowMCR = Data;
1865                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1866                                                                         Data);
1867                 if (status < 0) {
1868                         dbg("Writing spreg failed in set_serial_baud");
1869                         return -1;
1870                 }
1871 #endif
1872
1873         } else {
1874 #ifdef HW_flow_control
1875                 /* setting h/w flow control bit to 0 */
1876                 Data = 0xb;
1877                 mos7840_port->shadowMCR = Data;
1878                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1879                                                                         Data);
1880                 if (status < 0) {
1881                         dbg("Writing spreg failed in set_serial_baud");
1882                         return -1;
1883                 }
1884 #endif
1885
1886         }
1887
1888         if (1) {                /* baudRate <= 115200) */
1889                 clk_sel_val = 0x0;
1890                 Data = 0x0;
1891                 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1892                                                    &clk_sel_val);
1893                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1894                                                                  &Data);
1895                 if (status < 0) {
1896                         dbg("reading spreg failed in set_serial_baud");
1897                         return -1;
1898                 }
1899                 Data = (Data & 0x8f) | clk_sel_val;
1900                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1901                                                                 Data);
1902                 if (status < 0) {
1903                         dbg("Writing spreg failed in set_serial_baud");
1904                         return -1;
1905                 }
1906                 /* Calculate the Divisor */
1907
1908                 if (status) {
1909                         dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1910                         return status;
1911                 }
1912                 /* Enable access to divisor latch */
1913                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1914                 mos7840_port->shadowLCR = Data;
1915                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1916
1917                 /* Write the divisor */
1918                 Data = (unsigned char)(divisor & 0xff);
1919                 dbg("set_serial_baud Value to write DLL is %x", Data);
1920                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1921
1922                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1923                 dbg("set_serial_baud Value to write DLM is %x", Data);
1924                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1925
1926                 /* Disable access to divisor latch */
1927                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1928                 mos7840_port->shadowLCR = Data;
1929                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1930
1931         }
1932         return status;
1933 }
1934
1935 /*****************************************************************************
1936  * mos7840_change_port_settings
1937  *      This routine is called to set the UART on the device to match
1938  *      the specified new settings.
1939  *****************************************************************************/
1940
1941 static void mos7840_change_port_settings(struct tty_struct *tty,
1942         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1943 {
1944         int baud;
1945         unsigned cflag;
1946         unsigned iflag;
1947         __u8 lData;
1948         __u8 lParity;
1949         __u8 lStop;
1950         int status;
1951         __u16 Data;
1952         struct usb_serial_port *port;
1953         struct usb_serial *serial;
1954
1955         if (mos7840_port == NULL)
1956                 return;
1957
1958         port = (struct usb_serial_port *)mos7840_port->port;
1959
1960         if (mos7840_port_paranoia_check(port, __func__)) {
1961                 dbg("%s", "Invalid port");
1962                 return;
1963         }
1964
1965         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1966                 dbg("%s", "Invalid Serial");
1967                 return;
1968         }
1969
1970         serial = port->serial;
1971
1972         dbg("%s - port %d", __func__, mos7840_port->port->number);
1973
1974         if (!mos7840_port->open) {
1975                 dbg("%s - port not opened", __func__);
1976                 return;
1977         }
1978
1979         dbg("%s", "Entering ..........");
1980
1981         lData = LCR_BITS_8;
1982         lStop = LCR_STOP_1;
1983         lParity = LCR_PAR_NONE;
1984
1985         cflag = tty->termios->c_cflag;
1986         iflag = tty->termios->c_iflag;
1987
1988         /* Change the number of bits */
1989         switch (cflag & CSIZE) {
1990         case CS5:
1991                 lData = LCR_BITS_5;
1992                 break;
1993
1994         case CS6:
1995                 lData = LCR_BITS_6;
1996                 break;
1997
1998         case CS7:
1999                 lData = LCR_BITS_7;
2000                 break;
2001
2002         default:
2003         case CS8:
2004                 lData = LCR_BITS_8;
2005                 break;
2006         }
2007
2008         /* Change the Parity bit */
2009         if (cflag & PARENB) {
2010                 if (cflag & PARODD) {
2011                         lParity = LCR_PAR_ODD;
2012                         dbg("%s - parity = odd", __func__);
2013                 } else {
2014                         lParity = LCR_PAR_EVEN;
2015                         dbg("%s - parity = even", __func__);
2016                 }
2017
2018         } else {
2019                 dbg("%s - parity = none", __func__);
2020         }
2021
2022         if (cflag & CMSPAR)
2023                 lParity = lParity | 0x20;
2024
2025         /* Change the Stop bit */
2026         if (cflag & CSTOPB) {
2027                 lStop = LCR_STOP_2;
2028                 dbg("%s - stop bits = 2", __func__);
2029         } else {
2030                 lStop = LCR_STOP_1;
2031                 dbg("%s - stop bits = 1", __func__);
2032         }
2033
2034         /* Update the LCR with the correct value */
2035         mos7840_port->shadowLCR &=
2036             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
2037         mos7840_port->shadowLCR |= (lData | lParity | lStop);
2038
2039         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x",
2040             mos7840_port->shadowLCR);
2041         /* Disable Interrupts */
2042         Data = 0x00;
2043         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2044
2045         Data = 0x00;
2046         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2047
2048         Data = 0xcf;
2049         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2050
2051         /* Send the updated LCR value to the mos7840 */
2052         Data = mos7840_port->shadowLCR;
2053
2054         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2055
2056         Data = 0x00b;
2057         mos7840_port->shadowMCR = Data;
2058         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2059         Data = 0x00b;
2060         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2061
2062         /* set up the MCR register and send it to the mos7840 */
2063
2064         mos7840_port->shadowMCR = MCR_MASTER_IE;
2065         if (cflag & CBAUD)
2066                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2067
2068         if (cflag & CRTSCTS)
2069                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2070         else
2071                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2072
2073         Data = mos7840_port->shadowMCR;
2074         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2075
2076         /* Determine divisor based on baud rate */
2077         baud = tty_get_baud_rate(tty);
2078
2079         if (!baud) {
2080                 /* pick a default, any default... */
2081                 dbg("%s", "Picked default baud...");
2082                 baud = 9600;
2083         }
2084
2085         dbg("%s - baud rate = %d", __func__, baud);
2086         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2087
2088         /* Enable Interrupts */
2089         Data = 0x0c;
2090         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2091
2092         if (mos7840_port->read_urb_busy == false) {
2093                 mos7840_port->read_urb->dev = serial->dev;
2094                 mos7840_port->read_urb_busy = true;
2095                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2096                 if (status) {
2097                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2098                             status);
2099                         mos7840_port->read_urb_busy = false;
2100                 }
2101         }
2102         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x",
2103             mos7840_port->shadowLCR);
2104 }
2105
2106 /*****************************************************************************
2107  * mos7840_set_termios
2108  *      this function is called by the tty driver when it wants to change
2109  *      the termios structure
2110  *****************************************************************************/
2111
2112 static void mos7840_set_termios(struct tty_struct *tty,
2113                                 struct usb_serial_port *port,
2114                                 struct ktermios *old_termios)
2115 {
2116         int status;
2117         unsigned int cflag;
2118         struct usb_serial *serial;
2119         struct moschip_port *mos7840_port;
2120         dbg("mos7840_set_termios: START");
2121         if (mos7840_port_paranoia_check(port, __func__)) {
2122                 dbg("%s", "Invalid port");
2123                 return;
2124         }
2125
2126         serial = port->serial;
2127
2128         if (mos7840_serial_paranoia_check(serial, __func__)) {
2129                 dbg("%s", "Invalid Serial");
2130                 return;
2131         }
2132
2133         mos7840_port = mos7840_get_port_private(port);
2134
2135         if (mos7840_port == NULL)
2136                 return;
2137
2138         if (!mos7840_port->open) {
2139                 dbg("%s - port not opened", __func__);
2140                 return;
2141         }
2142
2143         dbg("%s", "setting termios - ");
2144
2145         cflag = tty->termios->c_cflag;
2146
2147         dbg("%s - clfag %08x iflag %08x", __func__,
2148             tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2149         dbg("%s - old clfag %08x old iflag %08x", __func__,
2150             old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2151         dbg("%s - port %d", __func__, port->number);
2152
2153         /* change the port settings to the new ones specified */
2154
2155         mos7840_change_port_settings(tty, mos7840_port, old_termios);
2156
2157         if (!mos7840_port->read_urb) {
2158                 dbg("%s", "URB KILLED !!!!!");
2159                 return;
2160         }
2161
2162         if (mos7840_port->read_urb_busy == false) {
2163                 mos7840_port->read_urb->dev = serial->dev;
2164                 mos7840_port->read_urb_busy = true;
2165                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2166                 if (status) {
2167                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2168                             status);
2169                         mos7840_port->read_urb_busy = false;
2170                 }
2171         }
2172 }
2173
2174 /*****************************************************************************
2175  * mos7840_get_lsr_info - get line status register info
2176  *
2177  * Purpose: Let user call ioctl() to get info when the UART physically
2178  *          is emptied.  On bus types like RS485, the transmitter must
2179  *          release the bus after transmitting. This must be done when
2180  *          the transmit shift register is empty, not be done when the
2181  *          transmit holding register is empty.  This functionality
2182  *          allows an RS485 driver to be written in user space.
2183  *****************************************************************************/
2184
2185 static int mos7840_get_lsr_info(struct tty_struct *tty,
2186                                 unsigned int __user *value)
2187 {
2188         int count;
2189         unsigned int result = 0;
2190
2191         count = mos7840_chars_in_buffer(tty);
2192         if (count == 0) {
2193                 dbg("%s -- Empty", __func__);
2194                 result = TIOCSER_TEMT;
2195         }
2196
2197         if (copy_to_user(value, &result, sizeof(int)))
2198                 return -EFAULT;
2199         return 0;
2200 }
2201
2202 /*****************************************************************************
2203  * mos7840_get_serial_info
2204  *      function to get information about serial port
2205  *****************************************************************************/
2206
2207 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2208                                    struct serial_struct __user *retinfo)
2209 {
2210         struct serial_struct tmp;
2211
2212         if (mos7840_port == NULL)
2213                 return -1;
2214
2215         if (!retinfo)
2216                 return -EFAULT;
2217
2218         memset(&tmp, 0, sizeof(tmp));
2219
2220         tmp.type = PORT_16550A;
2221         tmp.line = mos7840_port->port->serial->minor;
2222         tmp.port = mos7840_port->port->number;
2223         tmp.irq = 0;
2224         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2225         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2226         tmp.baud_base = 9600;
2227         tmp.close_delay = 5 * HZ;
2228         tmp.closing_wait = 30 * HZ;
2229
2230         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2231                 return -EFAULT;
2232         return 0;
2233 }
2234
2235 static int mos7840_get_icount(struct tty_struct *tty,
2236                         struct serial_icounter_struct *icount)
2237 {
2238         struct usb_serial_port *port = tty->driver_data;
2239         struct moschip_port *mos7840_port;
2240         struct async_icount cnow;
2241
2242         mos7840_port = mos7840_get_port_private(port);
2243         cnow = mos7840_port->icount;
2244
2245         smp_rmb();
2246         icount->cts = cnow.cts;
2247         icount->dsr = cnow.dsr;
2248         icount->rng = cnow.rng;
2249         icount->dcd = cnow.dcd;
2250         icount->rx = cnow.rx;
2251         icount->tx = cnow.tx;
2252         icount->frame = cnow.frame;
2253         icount->overrun = cnow.overrun;
2254         icount->parity = cnow.parity;
2255         icount->brk = cnow.brk;
2256         icount->buf_overrun = cnow.buf_overrun;
2257
2258         dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2259                 port->number, icount->rx, icount->tx);
2260         return 0;
2261 }
2262
2263 /*****************************************************************************
2264  * SerialIoctl
2265  *      this function handles any ioctl calls to the driver
2266  *****************************************************************************/
2267
2268 static int mos7840_ioctl(struct tty_struct *tty,
2269                          unsigned int cmd, unsigned long arg)
2270 {
2271         struct usb_serial_port *port = tty->driver_data;
2272         void __user *argp = (void __user *)arg;
2273         struct moschip_port *mos7840_port;
2274
2275         struct async_icount cnow;
2276         struct async_icount cprev;
2277
2278         if (mos7840_port_paranoia_check(port, __func__)) {
2279                 dbg("%s", "Invalid port");
2280                 return -1;
2281         }
2282
2283         mos7840_port = mos7840_get_port_private(port);
2284
2285         if (mos7840_port == NULL)
2286                 return -1;
2287
2288         dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2289
2290         switch (cmd) {
2291                 /* return number of bytes available */
2292
2293         case TIOCSERGETLSR:
2294                 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2295                 return mos7840_get_lsr_info(tty, argp);
2296
2297         case TIOCGSERIAL:
2298                 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2299                 return mos7840_get_serial_info(mos7840_port, argp);
2300
2301         case TIOCSSERIAL:
2302                 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2303                 break;
2304
2305         case TIOCMIWAIT:
2306                 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2307                 cprev = mos7840_port->icount;
2308                 while (1) {
2309                         /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2310                         mos7840_port->delta_msr_cond = 0;
2311                         wait_event_interruptible(port->delta_msr_wait,
2312                                                  (port->serial->disconnected ||
2313                                                   mos7840_port->
2314                                                   delta_msr_cond == 1));
2315
2316                         /* see if a signal did it */
2317                         if (signal_pending(current))
2318                                 return -ERESTARTSYS;
2319
2320                         if (port->serial->disconnected)
2321                                 return -EIO;
2322
2323                         cnow = mos7840_port->icount;
2324                         smp_rmb();
2325                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2326                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2327                                 return -EIO;    /* no change => error */
2328                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2329                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2330                             ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2331                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2332                                 return 0;
2333                         }
2334                         cprev = cnow;
2335                 }
2336                 /* NOTREACHED */
2337                 break;
2338
2339         default:
2340                 break;
2341         }
2342         return -ENOIOCTLCMD;
2343 }
2344
2345 static int mos7840_calc_num_ports(struct usb_serial *serial)
2346 {
2347         __u16 Data = 0x00;
2348         int ret = 0;
2349         int mos7840_num_ports;
2350
2351         ret = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2352                 MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, &Data,
2353                 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2354
2355         if ((Data & 0x01) == 0) {
2356                 mos7840_num_ports = 2;
2357                 serial->num_bulk_in = 2;
2358                 serial->num_bulk_out = 2;
2359                 serial->num_ports = 2;
2360         } else {
2361                 mos7840_num_ports = 4;
2362                 serial->num_bulk_in = 4;
2363                 serial->num_bulk_out = 4;
2364                 serial->num_ports = 4;
2365         }
2366
2367         return mos7840_num_ports;
2368 }
2369
2370 /****************************************************************************
2371  * mos7840_startup
2372  ****************************************************************************/
2373
2374 static int mos7840_startup(struct usb_serial *serial)
2375 {
2376         struct moschip_port *mos7840_port;
2377         struct usb_device *dev;
2378         int i, status;
2379
2380         __u16 Data;
2381         dbg("%s", "mos7840_startup :Entering..........");
2382
2383         if (!serial) {
2384                 dbg("%s", "Invalid Handler");
2385                 return -1;
2386         }
2387
2388         if (serial->num_bulk_in < serial->num_ports ||
2389                         serial->num_bulk_out < serial->num_ports ||
2390                         serial->num_interrupt_in < 1) {
2391                 dev_err(&serial->interface->dev, "missing endpoints\n");
2392                 return -ENODEV;
2393         }
2394
2395         dev = serial->dev;
2396
2397         dbg("%s", "Entering...");
2398         dbg ("mos7840_startup: serial = %p", serial);
2399
2400         /* we set up the pointers to the endpoints in the mos7840_open *
2401          * function, as the structures aren't created yet.             */
2402
2403         /* set up port private structures */
2404         for (i = 0; i < serial->num_ports; ++i) {
2405                 dbg ("mos7840_startup: configuring port %d............", i);
2406                 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2407                 if (mos7840_port == NULL) {
2408                         dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2409                         status = -ENOMEM;
2410                         i--; /* don't follow NULL pointer cleaning up */
2411                         goto error;
2412                 }
2413
2414                 /* Initialize all port interrupt end point to port 0 int
2415                  * endpoint. Our device has only one interrupt end point
2416                  * common to all port */
2417
2418                 mos7840_port->port = serial->port[i];
2419                 mos7840_set_port_private(serial->port[i], mos7840_port);
2420                 spin_lock_init(&mos7840_port->pool_lock);
2421
2422                 /* minor is not initialised until later by
2423                  * usb-serial.c:get_free_serial() and cannot therefore be used
2424                  * to index device instances */
2425                 mos7840_port->port_num = i + 1;
2426                 dbg ("serial->port[i]->number = %d", serial->port[i]->number);
2427                 dbg ("serial->port[i]->serial->minor = %d", serial->port[i]->serial->minor);
2428                 dbg ("mos7840_port->port_num = %d", mos7840_port->port_num);
2429                 dbg ("serial->minor = %d", serial->minor);
2430
2431                 if (mos7840_port->port_num == 1) {
2432                         mos7840_port->SpRegOffset = 0x0;
2433                         mos7840_port->ControlRegOffset = 0x1;
2434                         mos7840_port->DcrRegOffset = 0x4;
2435                 } else if ((mos7840_port->port_num == 2)
2436                            && (serial->num_ports == 4)) {
2437                         mos7840_port->SpRegOffset = 0x8;
2438                         mos7840_port->ControlRegOffset = 0x9;
2439                         mos7840_port->DcrRegOffset = 0x16;
2440                 } else if ((mos7840_port->port_num == 2)
2441                            && (serial->num_ports == 2)) {
2442                         mos7840_port->SpRegOffset = 0xa;
2443                         mos7840_port->ControlRegOffset = 0xb;
2444                         mos7840_port->DcrRegOffset = 0x19;
2445                 } else if ((mos7840_port->port_num == 3)
2446                            && (serial->num_ports == 4)) {
2447                         mos7840_port->SpRegOffset = 0xa;
2448                         mos7840_port->ControlRegOffset = 0xb;
2449                         mos7840_port->DcrRegOffset = 0x19;
2450                 } else if ((mos7840_port->port_num == 4)
2451                            && (serial->num_ports == 4)) {
2452                         mos7840_port->SpRegOffset = 0xc;
2453                         mos7840_port->ControlRegOffset = 0xd;
2454                         mos7840_port->DcrRegOffset = 0x1c;
2455                 }
2456                 mos7840_dump_serial_port(mos7840_port);
2457                 mos7840_set_port_private(serial->port[i], mos7840_port);
2458
2459                 /* enable rx_disable bit in control register */
2460                 status = mos7840_get_reg_sync(serial->port[i],
2461                                  mos7840_port->ControlRegOffset, &Data);
2462                 if (status < 0) {
2463                         dbg("Reading ControlReg failed status-0x%x", status);
2464                         break;
2465                 } else
2466                         dbg("ControlReg Reading success val is %x, status%d",
2467                             Data, status);
2468                 Data |= 0x08;   /* setting driver done bit */
2469                 Data |= 0x04;   /* sp1_bit to have cts change reflect in
2470                                    modem status reg */
2471
2472                 /* Data |= 0x20; //rx_disable bit */
2473                 status = mos7840_set_reg_sync(serial->port[i],
2474                                          mos7840_port->ControlRegOffset, Data);
2475                 if (status < 0) {
2476                         dbg("Writing ControlReg failed(rx_disable) status-0x%x", status);
2477                         break;
2478                 } else
2479                         dbg("ControlReg Writing success(rx_disable) status%d",
2480                             status);
2481
2482                 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2483                    and 0x24 in DCR3 */
2484                 Data = 0x01;
2485                 status = mos7840_set_reg_sync(serial->port[i],
2486                          (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2487                 if (status < 0) {
2488                         dbg("Writing DCR0 failed status-0x%x", status);
2489                         break;
2490                 } else
2491                         dbg("DCR0 Writing success status%d", status);
2492
2493                 Data = 0x05;
2494                 status = mos7840_set_reg_sync(serial->port[i],
2495                          (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2496                 if (status < 0) {
2497                         dbg("Writing DCR1 failed status-0x%x", status);
2498                         break;
2499                 } else
2500                         dbg("DCR1 Writing success status%d", status);
2501
2502                 Data = 0x24;
2503                 status = mos7840_set_reg_sync(serial->port[i],
2504                          (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2505                 if (status < 0) {
2506                         dbg("Writing DCR2 failed status-0x%x", status);
2507                         break;
2508                 } else
2509                         dbg("DCR2 Writing success status%d", status);
2510
2511                 /* write values in clkstart0x0 and clkmulti 0x20 */
2512                 Data = 0x0;
2513                 status = mos7840_set_reg_sync(serial->port[i],
2514                                          CLK_START_VALUE_REGISTER, Data);
2515                 if (status < 0) {
2516                         dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x", status);
2517                         break;
2518                 } else
2519                         dbg("CLK_START_VALUE_REGISTER Writing success status%d", status);
2520
2521                 Data = 0x20;
2522                 status = mos7840_set_reg_sync(serial->port[i],
2523                                         CLK_MULTI_REGISTER, Data);
2524                 if (status < 0) {
2525                         dbg("Writing CLK_MULTI_REGISTER failed status-0x%x",
2526                             status);
2527                         goto error;
2528                 } else
2529                         dbg("CLK_MULTI_REGISTER Writing success status%d",
2530                             status);
2531
2532                 /* write value 0x0 to scratchpad register */
2533                 Data = 0x00;
2534                 status = mos7840_set_uart_reg(serial->port[i],
2535                                                 SCRATCH_PAD_REGISTER, Data);
2536                 if (status < 0) {
2537                         dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x",
2538                             status);
2539                         break;
2540                 } else
2541                         dbg("SCRATCH_PAD_REGISTER Writing success status%d",
2542                             status);
2543
2544                 /* Zero Length flag register */
2545                 if ((mos7840_port->port_num != 1)
2546                     && (serial->num_ports == 2)) {
2547
2548                         Data = 0xff;
2549                         status = mos7840_set_reg_sync(serial->port[i],
2550                                       (__u16) (ZLP_REG1 +
2551                                       ((__u16)mos7840_port->port_num)), Data);
2552                         dbg("ZLIP offset %x",
2553                             (__u16) (ZLP_REG1 +
2554                                         ((__u16) mos7840_port->port_num)));
2555                         if (status < 0) {
2556                                 dbg("Writing ZLP_REG%d failed status-0x%x",
2557                                     i + 2, status);
2558                                 break;
2559                         } else
2560                                 dbg("ZLP_REG%d Writing success status%d",
2561                                     i + 2, status);
2562                 } else {
2563                         Data = 0xff;
2564                         status = mos7840_set_reg_sync(serial->port[i],
2565                               (__u16) (ZLP_REG1 +
2566                               ((__u16)mos7840_port->port_num) - 0x1), Data);
2567                         dbg("ZLIP offset %x",
2568                             (__u16) (ZLP_REG1 +
2569                                      ((__u16) mos7840_port->port_num) - 0x1));
2570                         if (status < 0) {
2571                                 dbg("Writing ZLP_REG%d failed status-0x%x",
2572                                     i + 1, status);
2573                                 break;
2574                         } else
2575                                 dbg("ZLP_REG%d Writing success status%d",
2576                                     i + 1, status);
2577
2578                 }
2579                 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2580                 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2581                 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2582                                                                 GFP_KERNEL);
2583                 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2584                                                         !mos7840_port->dr) {
2585                         status = -ENOMEM;
2586                         goto error;
2587                 }
2588         }
2589         dbg ("mos7840_startup: all ports configured...........");
2590
2591         /* Zero Length flag enable */
2592         Data = 0x0f;
2593         status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2594         if (status < 0) {
2595                 dbg("Writing ZLP_REG5 failed status-0x%x", status);
2596                 goto error;
2597         } else
2598                 dbg("ZLP_REG5 Writing success status%d", status);
2599
2600         /* setting configuration feature to one */
2601         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2602                         (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2603         return 0;
2604 error:
2605         for (/* nothing */; i >= 0; i--) {
2606                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2607
2608                 kfree(mos7840_port->dr);
2609                 kfree(mos7840_port->ctrl_buf);
2610                 usb_free_urb(mos7840_port->control_urb);
2611                 kfree(mos7840_port);
2612         }
2613         return status;
2614 }
2615
2616 /****************************************************************************
2617  * mos7840_disconnect
2618  *      This function is called whenever the device is removed from the usb bus.
2619  ****************************************************************************/
2620
2621 static void mos7840_disconnect(struct usb_serial *serial)
2622 {
2623         int i;
2624         struct moschip_port *mos7840_port;
2625         dbg("%s", " disconnect :entering..........");
2626
2627         if (!serial) {
2628                 dbg("%s", "Invalid Handler");
2629                 return;
2630         }
2631
2632         /* check for the ports to be closed,close the ports and disconnect */
2633
2634         /* free private structure allocated for serial port  *
2635          * stop reads and writes on all ports                */
2636
2637         for (i = 0; i < serial->num_ports; ++i) {
2638                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2639                 dbg ("mos7840_port %d = %p", i, mos7840_port);
2640                 if (mos7840_port) {
2641                         usb_kill_urb(mos7840_port->control_urb);
2642                 }
2643         }
2644
2645         dbg("%s", "Thank u :: ");
2646
2647 }
2648
2649 /****************************************************************************
2650  * mos7840_release
2651  *      This function is called when the usb_serial structure is freed.
2652  ****************************************************************************/
2653
2654 static void mos7840_release(struct usb_serial *serial)
2655 {
2656         int i;
2657         struct moschip_port *mos7840_port;
2658         dbg("%s", " release :entering..........");
2659
2660         if (!serial) {
2661                 dbg("%s", "Invalid Handler");
2662                 return;
2663         }
2664
2665         /* check for the ports to be closed,close the ports and disconnect */
2666
2667         /* free private structure allocated for serial port  *
2668          * stop reads and writes on all ports                */
2669
2670         for (i = 0; i < serial->num_ports; ++i) {
2671                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2672                 dbg("mos7840_port %d = %p", i, mos7840_port);
2673                 if (mos7840_port) {
2674                         usb_free_urb(mos7840_port->control_urb);
2675                         kfree(mos7840_port->ctrl_buf);
2676                         kfree(mos7840_port->dr);
2677                         kfree(mos7840_port);
2678                 }
2679         }
2680
2681         dbg("%s", "Thank u :: ");
2682
2683 }
2684
2685 static struct usb_driver io_driver = {
2686         .name = "mos7840",
2687         .probe = usb_serial_probe,
2688         .disconnect = usb_serial_disconnect,
2689         .id_table = moschip_id_table_combined,
2690         .no_dynamic_id = 1,
2691 };
2692
2693 static struct usb_serial_driver moschip7840_4port_device = {
2694         .driver = {
2695                    .owner = THIS_MODULE,
2696                    .name = "mos7840",
2697                    },
2698         .description = DRIVER_DESC,
2699         .usb_driver = &io_driver,
2700         .id_table = moschip_port_id_table,
2701         .num_ports = 4,
2702         .open = mos7840_open,
2703         .close = mos7840_close,
2704         .write = mos7840_write,
2705         .write_room = mos7840_write_room,
2706         .chars_in_buffer = mos7840_chars_in_buffer,
2707         .throttle = mos7840_throttle,
2708         .unthrottle = mos7840_unthrottle,
2709         .calc_num_ports = mos7840_calc_num_ports,
2710 #ifdef MCSSerialProbe
2711         .probe = mos7840_serial_probe,
2712 #endif
2713         .ioctl = mos7840_ioctl,
2714         .set_termios = mos7840_set_termios,
2715         .break_ctl = mos7840_break,
2716         .tiocmget = mos7840_tiocmget,
2717         .tiocmset = mos7840_tiocmset,
2718         .get_icount = mos7840_get_icount,
2719         .attach = mos7840_startup,
2720         .disconnect = mos7840_disconnect,
2721         .release = mos7840_release,
2722         .read_bulk_callback = mos7840_bulk_in_callback,
2723         .read_int_callback = mos7840_interrupt_callback,
2724 };
2725
2726 /****************************************************************************
2727  * moschip7840_init
2728  *      This is called by the module subsystem, or on startup to initialize us
2729  ****************************************************************************/
2730 static int __init moschip7840_init(void)
2731 {
2732         int retval;
2733
2734         dbg("%s", " mos7840_init :entering..........");
2735
2736         /* Register with the usb serial */
2737         retval = usb_serial_register(&moschip7840_4port_device);
2738
2739         if (retval)
2740                 goto failed_port_device_register;
2741
2742         dbg("%s", "Entering...");
2743         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
2744                DRIVER_DESC "\n");
2745
2746         /* Register with the usb */
2747         retval = usb_register(&io_driver);
2748         if (retval == 0) {
2749                 dbg("%s", "Leaving...");
2750                 return 0;
2751         }
2752         usb_serial_deregister(&moschip7840_4port_device);
2753 failed_port_device_register:
2754         return retval;
2755 }
2756
2757 /****************************************************************************
2758  * moschip7840_exit
2759  *      Called when the driver is about to be unloaded.
2760  ****************************************************************************/
2761 static void __exit moschip7840_exit(void)
2762 {
2763
2764         dbg("%s", " mos7840_exit :entering..........");
2765
2766         usb_deregister(&io_driver);
2767
2768         usb_serial_deregister(&moschip7840_4port_device);
2769
2770         dbg("%s", "Entering...");
2771 }
2772
2773 module_init(moschip7840_init);
2774 module_exit(moschip7840_exit);
2775
2776 /* Module information */
2777 MODULE_DESCRIPTION(DRIVER_DESC);
2778 MODULE_LICENSE("GPL");
2779
2780 module_param(debug, bool, S_IRUGO | S_IWUSR);
2781 MODULE_PARM_DESC(debug, "Debug enabled or not");