3 * Controls the Moschip 7720 usb to dual port serial convertor
5 * Copyright 2006 Moschip Semiconductor Tech. Ltd.
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, version 2 of the License.
12 * Vijaya Kumar <vijaykumar.gn@gmail.com>
13 * Ajay Kumar <naanuajay@yahoo.com>
14 * Gurudeva <ngurudeva@yahoo.com>
16 * Cleaned up from the original by:
17 * Greg Kroah-Hartman <gregkh@suse.de>
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>
23 #include <linux/kernel.h>
24 #include <linux/errno.h>
25 #include <linux/init.h>
26 #include <linux/slab.h>
27 #include <linux/tty.h>
28 #include <linux/tty_driver.h>
29 #include <linux/tty_flip.h>
30 #include <linux/module.h>
31 #include <linux/spinlock.h>
32 #include <linux/serial.h>
33 #include <linux/serial_reg.h>
34 #include <linux/usb.h>
35 #include <linux/usb/serial.h>
36 #include <asm/uaccess.h>
42 #define DRIVER_VERSION "1.0.0.4F"
43 #define DRIVER_AUTHOR "Aspire Communications pvt Ltd."
44 #define DRIVER_DESC "Moschip USB Serial Driver"
46 /* default urb timeout */
47 #define MOS_WDR_TIMEOUT (HZ * 5)
49 #define MOS_PORT1 0x0200
50 #define MOS_PORT2 0x0300
51 #define MOS_VENREG 0x0000
52 #define MOS_MAX_PORT 0x02
53 #define MOS_WRITE 0x0E
56 /* Interrupt Rotinue Defines */
57 #define SERIAL_IIR_RLS 0x06
58 #define SERIAL_IIR_RDA 0x04
59 #define SERIAL_IIR_CTI 0x0c
60 #define SERIAL_IIR_THR 0x02
61 #define SERIAL_IIR_MS 0x00
63 #define NUM_URBS 16 /* URB Count */
64 #define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
66 /* This structure holds all of the local port information */
69 __u8 shadowLCR; /* last LCR value received */
70 __u8 shadowMCR; /* last MCR value received */
71 __u8 shadowMSR; /* last MSR value received */
73 struct async_icount icount;
74 struct usb_serial_port *port; /* loop back to the owner */
75 struct urb *write_urb_pool[NUM_URBS];
78 /* This structure holds all of the individual serial device information */
81 int interrupt_started;
86 #define USB_VENDOR_ID_MOSCHIP 0x9710
87 #define MOSCHIP_DEVICE_ID_7720 0x7720
88 #define MOSCHIP_DEVICE_ID_7715 0x7715
90 static struct usb_device_id moschip_port_id_table [] = {
91 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP,MOSCHIP_DEVICE_ID_7720) },
92 { } /* terminating entry */
94 MODULE_DEVICE_TABLE(usb, moschip_port_id_table);
98 * mos7720_interrupt_callback
99 * this is the callback function for when we have received data on the
100 * interrupt endpoint.
102 static void mos7720_interrupt_callback(struct urb *urb)
106 int status = urb->status;
111 dbg("%s"," : Entering\n");
120 /* this urb is terminated, clean up */
121 dbg("%s - urb shutting down with status: %d", __func__,
125 dbg("%s - nonzero urb status received: %d", __func__,
130 length = urb->actual_length;
131 data = urb->transfer_buffer;
133 /* Moschip get 4 bytes
134 * Byte 1 IIR Port 1 (port.number is 0)
135 * Byte 2 IIR Port 2 (port.number is 1)
136 * Byte 3 --------------
137 * Byte 4 FIFO status for both */
139 /* the above description is inverted
140 * oneukum 2007-03-14 */
142 if (unlikely(length != 4)) {
143 dbg("Wrong data !!!");
150 if ((sp1 | sp2) & 0x01) {
151 /* No Interrupt Pending in both the ports */
152 dbg("No Interrupt !!!");
154 switch (sp1 & 0x0f) {
156 dbg("Serial Port 1: Receiver status error or address "
157 "bit detected in 9-bit mode\n");
160 dbg("Serial Port 1: Receiver time out");
163 dbg("Serial Port 1: Modem status change");
167 switch (sp2 & 0x0f) {
169 dbg("Serial Port 2: Receiver status error or address "
170 "bit detected in 9-bit mode");
173 dbg("Serial Port 2: Receiver time out");
176 dbg("Serial Port 2: Modem status change");
182 result = usb_submit_urb(urb, GFP_ATOMIC);
184 dev_err(&urb->dev->dev,
185 "%s - Error %d submitting control urb\n",
191 * mos7720_bulk_in_callback
192 * this is the callback function for when we have received data on the
195 static void mos7720_bulk_in_callback(struct urb *urb)
198 unsigned char *data ;
199 struct usb_serial_port *port;
200 struct moschip_port *mos7720_port;
201 struct tty_struct *tty;
202 int status = urb->status;
205 dbg("nonzero read bulk status received: %d", status);
209 mos7720_port = urb->context;
211 dbg("%s","NULL mos7720_port pointer \n");
215 port = mos7720_port->port;
217 dbg("Entering...%s", __func__);
219 data = urb->transfer_buffer;
221 tty = port->port.tty;
222 if (tty && urb->actual_length) {
223 tty_buffer_request_room(tty, urb->actual_length);
224 tty_insert_flip_string(tty, data, urb->actual_length);
225 tty_flip_buffer_push(tty);
228 if (!port->read_urb) {
229 dbg("URB KILLED !!!");
233 if (port->read_urb->status != -EINPROGRESS) {
234 port->read_urb->dev = port->serial->dev;
236 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
238 dbg("usb_submit_urb(read bulk) failed, retval = %d",
244 * mos7720_bulk_out_data_callback
245 * this is the callback function for when we have finished sending serial
246 * data on the bulk out endpoint.
248 static void mos7720_bulk_out_data_callback(struct urb *urb)
250 struct moschip_port *mos7720_port;
251 struct tty_struct *tty;
252 int status = urb->status;
255 dbg("nonzero write bulk status received:%d", status);
259 mos7720_port = urb->context;
261 dbg("NULL mos7720_port pointer");
265 dbg("Entering .........");
267 tty = mos7720_port->port->port.tty;
269 if (tty && mos7720_port->open)
275 * this function will be used for sending command to device
277 static int send_mos_cmd(struct usb_serial *serial, __u8 request, __u16 value,
278 __u16 index, void *data)
282 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
286 if (value < MOS_MAX_PORT) {
287 if (product == MOSCHIP_DEVICE_ID_7715) {
288 value = value*0x100+0x100;
290 value = value*0x100+0x200;
294 if ((product == MOSCHIP_DEVICE_ID_7715) &&
296 dbg("serial->product== MOSCHIP_DEVICE_ID_7715");
301 if (request == MOS_WRITE) {
302 request = (__u8)MOS_WRITE;
303 requesttype = (__u8)0x40;
304 value = value + (__u16)*((unsigned char *)data);
306 pipe = usb_sndctrlpipe(serial->dev, 0);
308 request = (__u8)MOS_READ;
309 requesttype = (__u8)0xC0;
311 pipe = usb_rcvctrlpipe(serial->dev,0);
314 status = usb_control_msg(serial->dev, pipe, request, requesttype,
315 value, index, data, size, MOS_WDR_TIMEOUT);
318 dbg("Command Write failed Value %x index %x\n",value,index);
323 static int mos7720_open(struct tty_struct *tty,
324 struct usb_serial_port *port, struct file * filp)
326 struct usb_serial *serial;
327 struct usb_serial_port *port0;
329 struct moschip_serial *mos7720_serial;
330 struct moschip_port *mos7720_port;
334 int allocated_urbs = 0;
337 serial = port->serial;
339 mos7720_port = usb_get_serial_port_data(port);
340 if (mos7720_port == NULL)
343 port0 = serial->port[0];
345 mos7720_serial = usb_get_serial_data(serial);
347 if (mos7720_serial == NULL || port0 == NULL)
350 usb_clear_halt(serial->dev, port->write_urb->pipe);
351 usb_clear_halt(serial->dev, port->read_urb->pipe);
353 /* Initialising the write urb pool */
354 for (j = 0; j < NUM_URBS; ++j) {
355 urb = usb_alloc_urb(0,GFP_KERNEL);
356 mos7720_port->write_urb_pool[j] = urb;
359 err("No more urbs???");
363 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
365 if (!urb->transfer_buffer) {
366 err("%s-out of memory for urb buffers.", __func__);
367 usb_free_urb(mos7720_port->write_urb_pool[j]);
368 mos7720_port->write_urb_pool[j] = NULL;
377 /* Initialize MCS7720 -- Write Init values to corresponding Registers
385 * 0x08 : SP1/2 Control Reg
387 port_number = port->number - port->serial->minor;
388 send_mos_cmd(port->serial, MOS_READ, port_number, UART_LSR, &data);
389 dbg("SS::%p LSR:%x\n",mos7720_port, data);
391 dbg("Check:Sending Command ..........");
394 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x01, &data);
396 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x02, &data);
399 send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);
401 send_mos_cmd(serial, MOS_WRITE, port_number, 0x02, &data);
404 send_mos_cmd(serial, MOS_WRITE, port_number, 0x02, &data);
406 mos7720_port->shadowLCR = data;
407 send_mos_cmd(serial, MOS_WRITE, port_number, 0x03, &data);
409 mos7720_port->shadowMCR = data;
410 send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
412 send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
415 send_mos_cmd(serial, MOS_READ, MOS_MAX_PORT, 0x08, &data);
417 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x08, &data);
420 send_mos_cmd(serial, MOS_READ, MOS_MAX_PORT, port_number + 1, &data);
422 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, port_number + 1, &data);
424 send_mos_cmd(port->serial, MOS_WRITE, MOS_MAX_PORT, port_number + 1, &data);
427 send_mos_cmd(serial, MOS_READ, MOS_MAX_PORT, 0x08, &data);
429 data = data | (port->number - port->serial->minor + 1);
430 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x08, &data);
433 mos7720_port->shadowLCR = data;
434 send_mos_cmd(serial, MOS_WRITE, port_number, 0x03, &data);
436 send_mos_cmd(serial, MOS_WRITE, port_number, 0x00, &data);
438 send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);
440 mos7720_port->shadowLCR = data;
441 send_mos_cmd(serial, MOS_WRITE, port_number, 0x03, &data);
443 send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);
445 send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);
447 /* force low_latency on so that our tty_push actually forces *
448 * the data through,otherwise it is scheduled, and with *
449 * high data rates (like with OHCI) data can get lost. */
452 tty->low_latency = 1;
454 /* see if we've set up our endpoint info yet *
455 * (can't set it up in mos7720_startup as the *
456 * structures were not set up at that time.) */
457 if (!mos7720_serial->interrupt_started) {
458 dbg("Interrupt buffer NULL !!!");
460 /* not set up yet, so do it now */
461 mos7720_serial->interrupt_started = 1;
463 dbg("To Submit URB !!!");
465 /* set up our interrupt urb */
466 usb_fill_int_urb(port0->interrupt_in_urb, serial->dev,
467 usb_rcvintpipe(serial->dev,
468 port->interrupt_in_endpointAddress),
469 port0->interrupt_in_buffer,
470 port0->interrupt_in_urb->transfer_buffer_length,
471 mos7720_interrupt_callback, mos7720_port,
472 port0->interrupt_in_urb->interval);
474 /* start interrupt read for this mos7720 this interrupt *
475 * will continue as long as the mos7720 is connected */
476 dbg("Submit URB over !!!");
477 response = usb_submit_urb(port0->interrupt_in_urb, GFP_KERNEL);
480 "%s - Error %d submitting control urb\n",
484 /* set up our bulk in urb */
485 usb_fill_bulk_urb(port->read_urb, serial->dev,
486 usb_rcvbulkpipe(serial->dev,
487 port->bulk_in_endpointAddress),
488 port->bulk_in_buffer,
489 port->read_urb->transfer_buffer_length,
490 mos7720_bulk_in_callback, mos7720_port);
491 response = usb_submit_urb(port->read_urb, GFP_KERNEL);
494 "%s - Error %d submitting read urb\n", __func__, response);
496 /* initialize our icount structure */
497 memset(&(mos7720_port->icount), 0x00, sizeof(mos7720_port->icount));
499 /* initialize our port settings */
500 mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */
502 /* send a open port command */
503 mos7720_port->open = 1;
509 * mos7720_chars_in_buffer
510 * this function is called by the tty driver when it wants to know how many
511 * bytes of data we currently have outstanding in the port (data that has
512 * been written, but hasn't made it out the port yet)
513 * If successful, we return the number of bytes left to be written in the
515 * Otherwise we return a negative error number.
517 static int mos7720_chars_in_buffer(struct tty_struct *tty)
519 struct usb_serial_port *port = tty->driver_data;
522 struct moschip_port *mos7720_port;
524 dbg("%s:entering ...........", __func__);
526 mos7720_port = usb_get_serial_port_data(port);
527 if (mos7720_port == NULL) {
528 dbg("%s:leaving ...........", __func__);
532 for (i = 0; i < NUM_URBS; ++i) {
533 if (mos7720_port->write_urb_pool[i] && mos7720_port->write_urb_pool[i]->status == -EINPROGRESS)
534 chars += URB_TRANSFER_BUFFER_SIZE;
536 dbg("%s - returns %d", __func__, chars);
540 static void mos7720_close(struct tty_struct *tty,
541 struct usb_serial_port *port, struct file *filp)
543 struct usb_serial *serial;
544 struct moschip_port *mos7720_port;
548 dbg("mos7720_close:entering...");
550 serial = port->serial;
552 mos7720_port = usb_get_serial_port_data(port);
553 if (mos7720_port == NULL)
556 for (j = 0; j < NUM_URBS; ++j)
557 usb_kill_urb(mos7720_port->write_urb_pool[j]);
559 /* Freeing Write URBs */
560 for (j = 0; j < NUM_URBS; ++j) {
561 if (mos7720_port->write_urb_pool[j]) {
562 kfree(mos7720_port->write_urb_pool[j]->transfer_buffer);
563 usb_free_urb(mos7720_port->write_urb_pool[j]);
567 /* While closing port, shutdown all bulk read, write *
568 * and interrupt read if they exists, otherwise nop */
569 dbg("Shutdown bulk write");
570 usb_kill_urb(port->write_urb);
571 dbg("Shutdown bulk read");
572 usb_kill_urb(port->read_urb);
574 mutex_lock(&serial->disc_mutex);
575 /* these commands must not be issued if the device has
576 * been disconnected */
577 if (!serial->disconnected) {
579 send_mos_cmd(serial, MOS_WRITE, port->number - port->serial->minor,
583 send_mos_cmd(serial, MOS_WRITE, port->number - port->serial->minor,
586 mutex_unlock(&serial->disc_mutex);
587 mos7720_port->open = 0;
589 dbg("Leaving %s", __func__);
592 static void mos7720_break(struct tty_struct *tty, int break_state)
594 struct usb_serial_port *port = tty->driver_data;
596 struct usb_serial *serial;
597 struct moschip_port *mos7720_port;
599 dbg("Entering %s", __func__);
601 serial = port->serial;
603 mos7720_port = usb_get_serial_port_data(port);
604 if (mos7720_port == NULL)
607 if (break_state == -1)
608 data = mos7720_port->shadowLCR | UART_LCR_SBC;
610 data = mos7720_port->shadowLCR & ~UART_LCR_SBC;
612 mos7720_port->shadowLCR = data;
613 send_mos_cmd(serial, MOS_WRITE, port->number - port->serial->minor,
621 * this function is called by the tty driver when it wants to know how many
622 * bytes of data we can accept for a specific port.
623 * If successful, we return the amount of room that we have for this port
624 * Otherwise we return a negative error number.
626 static int mos7720_write_room(struct tty_struct *tty)
628 struct usb_serial_port *port = tty->driver_data;
629 struct moschip_port *mos7720_port;
633 dbg("%s:entering ...........", __func__);
635 mos7720_port = usb_get_serial_port_data(port);
636 if (mos7720_port == NULL) {
637 dbg("%s:leaving ...........", __func__);
642 for (i = 0; i < NUM_URBS; ++i) {
643 if (mos7720_port->write_urb_pool[i] && mos7720_port->write_urb_pool[i]->status != -EINPROGRESS)
644 room += URB_TRANSFER_BUFFER_SIZE;
647 dbg("%s - returns %d", __func__, room);
651 static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port,
652 const unsigned char *data, int count)
659 struct moschip_port *mos7720_port;
660 struct usb_serial *serial;
662 const unsigned char *current_position = data;
664 dbg("%s:entering ...........", __func__);
666 serial = port->serial;
668 mos7720_port = usb_get_serial_port_data(port);
669 if (mos7720_port == NULL) {
670 dbg("mos7720_port is NULL");
674 /* try to find a free urb in the list */
677 for (i = 0; i < NUM_URBS; ++i) {
678 if (mos7720_port->write_urb_pool[i] && mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) {
679 urb = mos7720_port->write_urb_pool[i];
686 dbg("%s - no more free urbs", __func__);
690 if (urb->transfer_buffer == NULL) {
691 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
693 if (urb->transfer_buffer == NULL) {
694 err("%s no more kernel memory...", __func__);
698 transfer_size = min (count, URB_TRANSFER_BUFFER_SIZE);
700 memcpy(urb->transfer_buffer, current_position, transfer_size);
701 usb_serial_debug_data(debug, &port->dev, __func__, transfer_size,
702 urb->transfer_buffer);
704 /* fill urb with data and submit */
705 usb_fill_bulk_urb(urb, serial->dev,
706 usb_sndbulkpipe(serial->dev,
707 port->bulk_out_endpointAddress),
708 urb->transfer_buffer, transfer_size,
709 mos7720_bulk_out_data_callback, mos7720_port);
711 /* send it down the pipe */
712 status = usb_submit_urb(urb,GFP_ATOMIC);
714 err("%s - usb_submit_urb(write bulk) failed with status = %d",
719 bytes_sent = transfer_size;
725 static void mos7720_throttle(struct tty_struct *tty)
727 struct usb_serial_port *port = tty->driver_data;
728 struct moschip_port *mos7720_port;
731 dbg("%s- port %d\n", __func__, port->number);
733 mos7720_port = usb_get_serial_port_data(port);
735 if (mos7720_port == NULL)
738 if (!mos7720_port->open) {
739 dbg("port not opened");
743 dbg("%s: Entering ..........", __func__);
745 /* if we are implementing XON/XOFF, send the stop character */
747 unsigned char stop_char = STOP_CHAR(tty);
748 status = mos7720_write(tty, port, &stop_char, 1);
753 /* if we are implementing RTS/CTS, toggle that line */
754 if (tty->termios->c_cflag & CRTSCTS) {
755 mos7720_port->shadowMCR &= ~UART_MCR_RTS;
756 status = send_mos_cmd(port->serial, MOS_WRITE,
757 port->number - port->serial->minor,
758 UART_MCR, &mos7720_port->shadowMCR);
764 static void mos7720_unthrottle(struct tty_struct *tty)
766 struct usb_serial_port *port = tty->driver_data;
767 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
770 if (mos7720_port == NULL)
773 if (!mos7720_port->open) {
774 dbg("%s - port not opened", __func__);
778 dbg("%s: Entering ..........", __func__);
780 /* if we are implementing XON/XOFF, send the start character */
782 unsigned char start_char = START_CHAR(tty);
783 status = mos7720_write(tty, port, &start_char, 1);
788 /* if we are implementing RTS/CTS, toggle that line */
789 if (tty->termios->c_cflag & CRTSCTS) {
790 mos7720_port->shadowMCR |= UART_MCR_RTS;
791 status = send_mos_cmd(port->serial, MOS_WRITE,
792 port->number - port->serial->minor,
793 UART_MCR, &mos7720_port->shadowMCR);
799 static int set_higher_rates(struct moschip_port *mos7720_port,
803 struct usb_serial_port *port;
804 struct usb_serial *serial;
807 if (mos7720_port == NULL)
810 port = mos7720_port->port;
811 serial = port->serial;
813 /***********************************************
814 * Init Sequence for higher rates
815 ***********************************************/
816 dbg("Sending Setting Commands ..........");
817 port_number = port->number - port->serial->minor;
820 send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);
822 send_mos_cmd(serial, MOS_WRITE, port_number, 0x02, &data);
824 send_mos_cmd(serial, MOS_WRITE, port->number, 0x02, &data);
826 mos7720_port->shadowMCR = data;
827 send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
829 send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
832 send_mos_cmd(serial, MOS_READ, MOS_MAX_PORT, 0x08, &data);
834 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x08, &data);
837 /***********************************************
838 * Set for higher rates *
839 ***********************************************/
842 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, port_number + 1,&data);
845 send_mos_cmd(serial, MOS_READ, MOS_MAX_PORT, 0x08, &data);
847 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x08, &data);
850 mos7720_port->shadowMCR = data;
851 send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
853 send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
855 /***********************************************
857 ***********************************************/
859 data = mos7720_port->shadowLCR | UART_LCR_DLAB;
860 mos7720_port->shadowLCR = data;
861 send_mos_cmd(serial, MOS_WRITE, port_number, 0x03, &data);
863 data = 0x001; /* DLL */
864 send_mos_cmd(serial, MOS_WRITE, port_number, 0x00, &data);
865 data = 0x000; /* DLM */
866 send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);
868 data = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
869 mos7720_port->shadowLCR = data;
870 send_mos_cmd(serial, MOS_WRITE, port_number, 0x03, &data);
875 /* baud rate information */
876 struct divisor_table_entry
882 /* Define table of divisors for moschip 7720 hardware *
883 * These assume a 3.6864MHz crystal, the standard /16, and *
885 static struct divisor_table_entry divisor_table[] = {
887 { 110, 1047}, /* 2094.545455 => 230450 => .0217 % over */
888 { 134, 857}, /* 1713.011152 => 230398.5 => .00065% under */
904 /*****************************************************************************
905 * calc_baud_rate_divisor
906 * this function calculates the proper baud rate divisor for the specified
908 *****************************************************************************/
909 static int calc_baud_rate_divisor(int baudrate, int *divisor)
917 dbg("%s - %d", __func__, baudrate);
919 for (i = 0; i < ARRAY_SIZE(divisor_table); i++) {
920 if (divisor_table[i].baudrate == baudrate) {
921 *divisor = divisor_table[i].divisor;
926 /* After trying for all the standard baud rates *
927 * Try calculating the divisor for this baud rate */
928 if (baudrate > 75 && baudrate < 230400) {
929 /* get the divisor */
930 custom = (__u16)(230400L / baudrate);
932 /* Check for round off */
933 round1 = (__u16)(2304000L / baudrate);
934 round = (__u16)(round1 - (custom * 10));
939 dbg("Baud %d = %d",baudrate, custom);
943 dbg("Baud calculation Failed...");
948 * send_cmd_write_baud_rate
949 * this function sends the proper command to change the baud rate of the
952 static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port,
955 struct usb_serial_port *port;
956 struct usb_serial *serial;
960 unsigned char number;
962 if (mos7720_port == NULL)
965 port = mos7720_port->port;
966 serial = port->serial;
968 dbg("%s: Entering ..........", __func__);
970 number = port->number - port->serial->minor;
971 dbg("%s - port = %d, baud = %d", __func__, port->number, baudrate);
973 /* Calculate the Divisor */
974 status = calc_baud_rate_divisor(baudrate, &divisor);
976 err("%s - bad baud rate", __func__);
980 /* Enable access to divisor latch */
981 data = mos7720_port->shadowLCR | UART_LCR_DLAB;
982 mos7720_port->shadowLCR = data;
983 send_mos_cmd(serial, MOS_WRITE, number, UART_LCR, &data);
985 /* Write the divisor */
986 data = ((unsigned char)(divisor & 0xff));
987 send_mos_cmd(serial, MOS_WRITE, number, 0x00, &data);
989 data = ((unsigned char)((divisor & 0xff00) >> 8));
990 send_mos_cmd(serial, MOS_WRITE, number, 0x01, &data);
992 /* Disable access to divisor latch */
993 data = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
994 mos7720_port->shadowLCR = data;
995 send_mos_cmd(serial, MOS_WRITE, number, 0x03, &data);
1001 * change_port_settings
1002 * This routine is called to set the UART on the device to match
1003 * the specified new settings.
1005 static void change_port_settings(struct tty_struct *tty,
1006 struct moschip_port *mos7720_port,
1007 struct ktermios *old_termios)
1009 struct usb_serial_port *port;
1010 struct usb_serial *serial;
1022 if (mos7720_port == NULL)
1025 port = mos7720_port->port;
1026 serial = port->serial;
1027 port_number = port->number - port->serial->minor;
1029 dbg("%s - port %d", __func__, port->number);
1031 if (!mos7720_port->open) {
1032 dbg("%s - port not opened", __func__);
1036 dbg("%s: Entering ..........", __func__);
1038 lData = UART_LCR_WLEN8;
1039 lStop = 0x00; /* 1 stop bit */
1040 lParity = 0x00; /* No parity */
1042 cflag = tty->termios->c_cflag;
1043 iflag = tty->termios->c_iflag;
1045 /* Change the number of bits */
1046 switch (cflag & CSIZE) {
1048 lData = UART_LCR_WLEN5;
1053 lData = UART_LCR_WLEN6;
1058 lData = UART_LCR_WLEN7;
1063 lData = UART_LCR_WLEN8;
1067 /* Change the Parity bit */
1068 if (cflag & PARENB) {
1069 if (cflag & PARODD) {
1070 lParity = UART_LCR_PARITY;
1071 dbg("%s - parity = odd", __func__);
1073 lParity = (UART_LCR_EPAR | UART_LCR_PARITY);
1074 dbg("%s - parity = even", __func__);
1078 dbg("%s - parity = none", __func__);
1082 lParity = lParity | 0x20;
1084 /* Change the Stop bit */
1085 if (cflag & CSTOPB) {
1086 lStop = UART_LCR_STOP;
1087 dbg("%s - stop bits = 2", __func__);
1090 dbg("%s - stop bits = 1", __func__);
1093 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */
1094 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */
1095 #define LCR_PAR_MASK 0x38 /* Mask for parity field */
1097 /* Update the LCR with the correct value */
1098 mos7720_port->shadowLCR &= ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1099 mos7720_port->shadowLCR |= (lData | lParity | lStop);
1102 /* Disable Interrupts */
1104 send_mos_cmd(serial,MOS_WRITE,port->number - port->serial->minor, UART_IER, &data);
1107 send_mos_cmd(serial, MOS_WRITE, port_number, UART_FCR, &data);
1110 send_mos_cmd(serial, MOS_WRITE, port_number, UART_FCR, &data);
1112 /* Send the updated LCR value to the mos7720 */
1113 data = mos7720_port->shadowLCR;
1114 send_mos_cmd(serial, MOS_WRITE, port_number, UART_LCR, &data);
1117 mos7720_port->shadowMCR = data;
1118 send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
1120 send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
1122 /* set up the MCR register and send it to the mos7720 */
1123 mos7720_port->shadowMCR = UART_MCR_OUT2;
1125 mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS);
1127 if (cflag & CRTSCTS) {
1128 mos7720_port->shadowMCR |= (UART_MCR_XONANY);
1130 /* To set hardware flow control to the specified *
1131 * serial port, in SP1/2_CONTROL_REG */
1134 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT,
1138 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT,
1142 mos7720_port->shadowMCR &= ~(UART_MCR_XONANY);
1145 data = mos7720_port->shadowMCR;
1146 send_mos_cmd(serial, MOS_WRITE, port_number, UART_MCR, &data);
1148 /* Determine divisor based on baud rate */
1149 baud = tty_get_baud_rate(tty);
1151 /* pick a default, any default... */
1152 dbg("Picked default baud...");
1156 if (baud >= 230400) {
1157 set_higher_rates(mos7720_port, baud);
1158 /* Enable Interrupts */
1160 send_mos_cmd(serial, MOS_WRITE, port_number, UART_IER, &data);
1164 dbg("%s - baud rate = %d", __func__, baud);
1165 status = send_cmd_write_baud_rate(mos7720_port, baud);
1166 /* FIXME: needs to write actual resulting baud back not just
1169 tty_encode_baud_rate(tty, baud, baud);
1170 /* Enable Interrupts */
1172 send_mos_cmd(serial, MOS_WRITE, port_number, UART_IER, &data);
1174 if (port->read_urb->status != -EINPROGRESS) {
1175 port->read_urb->dev = serial->dev;
1177 status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1179 dbg("usb_submit_urb(read bulk) failed, status = %d",
1186 * mos7720_set_termios
1187 * this function is called by the tty driver when it wants to change the
1188 * termios structure.
1190 static void mos7720_set_termios(struct tty_struct *tty,
1191 struct usb_serial_port *port, struct ktermios *old_termios)
1195 struct usb_serial *serial;
1196 struct moschip_port *mos7720_port;
1198 serial = port->serial;
1200 mos7720_port = usb_get_serial_port_data(port);
1202 if (mos7720_port == NULL)
1205 if (!mos7720_port->open) {
1206 dbg("%s - port not opened", __func__);
1210 dbg("%s\n","setting termios - ASPIRE");
1212 cflag = tty->termios->c_cflag;
1214 dbg("%s - cflag %08x iflag %08x", __func__,
1215 tty->termios->c_cflag,
1216 RELEVANT_IFLAG(tty->termios->c_iflag));
1218 dbg("%s - old cflag %08x old iflag %08x", __func__,
1219 old_termios->c_cflag,
1220 RELEVANT_IFLAG(old_termios->c_iflag));
1222 dbg("%s - port %d", __func__, port->number);
1224 /* change the port settings to the new ones specified */
1225 change_port_settings(tty, mos7720_port, old_termios);
1227 if(!port->read_urb) {
1228 dbg("%s","URB KILLED !!!!!\n");
1232 if(port->read_urb->status != -EINPROGRESS) {
1233 port->read_urb->dev = serial->dev;
1234 status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1236 dbg("usb_submit_urb(read bulk) failed, status = %d",
1243 * get_lsr_info - get line status register info
1245 * Purpose: Let user call ioctl() to get info when the UART physically
1246 * is emptied. On bus types like RS485, the transmitter must
1247 * release the bus after transmitting. This must be done when
1248 * the transmit shift register is empty, not be done when the
1249 * transmit holding register is empty. This functionality
1250 * allows an RS485 driver to be written in user space.
1252 static int get_lsr_info(struct tty_struct *tty, struct moschip_port *mos7720_port,
1253 unsigned int __user *value)
1256 unsigned int result = 0;
1258 count = mos7720_chars_in_buffer(tty);
1260 dbg("%s -- Empty", __func__);
1261 result = TIOCSER_TEMT;
1264 if (copy_to_user(value, &result, sizeof(int)))
1270 * get_number_bytes_avail - get number of bytes available
1272 * Purpose: Let user call ioctl to get the count of number of bytes available.
1274 static int get_number_bytes_avail(struct moschip_port *mos7720_port,
1275 unsigned int __user *value)
1277 unsigned int result = 0;
1278 struct tty_struct *tty = mos7720_port->port->port.tty;
1281 return -ENOIOCTLCMD;
1283 result = tty->read_cnt;
1285 dbg("%s(%d) = %d", __func__, mos7720_port->port->number, result);
1286 if (copy_to_user(value, &result, sizeof(int)))
1289 return -ENOIOCTLCMD;
1292 static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd,
1293 unsigned int __user *value)
1299 struct usb_serial_port *port;
1301 if (mos7720_port == NULL)
1304 port = (struct usb_serial_port*)mos7720_port->port;
1305 mcr = mos7720_port->shadowMCR;
1307 if (copy_from_user(&arg, value, sizeof(int)))
1312 if (arg & TIOCM_RTS)
1313 mcr |= UART_MCR_RTS;
1314 if (arg & TIOCM_DTR)
1315 mcr |= UART_MCR_RTS;
1316 if (arg & TIOCM_LOOP)
1317 mcr |= UART_MCR_LOOP;
1321 if (arg & TIOCM_RTS)
1322 mcr &= ~UART_MCR_RTS;
1323 if (arg & TIOCM_DTR)
1324 mcr &= ~UART_MCR_RTS;
1325 if (arg & TIOCM_LOOP)
1326 mcr &= ~UART_MCR_LOOP;
1330 /* turn off the RTS and DTR and LOOPBACK
1331 * and then only turn on what was asked to */
1332 mcr &= ~(UART_MCR_RTS | UART_MCR_DTR | UART_MCR_LOOP);
1333 mcr |= ((arg & TIOCM_RTS) ? UART_MCR_RTS : 0);
1334 mcr |= ((arg & TIOCM_DTR) ? UART_MCR_DTR : 0);
1335 mcr |= ((arg & TIOCM_LOOP) ? UART_MCR_LOOP : 0);
1339 mos7720_port->shadowMCR = mcr;
1341 data = mos7720_port->shadowMCR;
1342 send_mos_cmd(port->serial, MOS_WRITE,
1343 port->number - port->serial->minor, UART_MCR, &data);
1348 static int get_modem_info(struct moschip_port *mos7720_port,
1349 unsigned int __user *value)
1351 unsigned int result = 0;
1352 unsigned int msr = mos7720_port->shadowMSR;
1353 unsigned int mcr = mos7720_port->shadowMCR;
1355 result = ((mcr & UART_MCR_DTR) ? TIOCM_DTR: 0) /* 0x002 */
1356 | ((mcr & UART_MCR_RTS) ? TIOCM_RTS: 0) /* 0x004 */
1357 | ((msr & UART_MSR_CTS) ? TIOCM_CTS: 0) /* 0x020 */
1358 | ((msr & UART_MSR_DCD) ? TIOCM_CAR: 0) /* 0x040 */
1359 | ((msr & UART_MSR_RI) ? TIOCM_RI: 0) /* 0x080 */
1360 | ((msr & UART_MSR_DSR) ? TIOCM_DSR: 0); /* 0x100 */
1363 dbg("%s -- %x", __func__, result);
1365 if (copy_to_user(value, &result, sizeof(int)))
1370 static int get_serial_info(struct moschip_port *mos7720_port,
1371 struct serial_struct __user *retinfo)
1373 struct serial_struct tmp;
1378 memset(&tmp, 0, sizeof(tmp));
1380 tmp.type = PORT_16550A;
1381 tmp.line = mos7720_port->port->serial->minor;
1382 tmp.port = mos7720_port->port->number;
1384 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
1385 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
1386 tmp.baud_base = 9600;
1387 tmp.close_delay = 5*HZ;
1388 tmp.closing_wait = 30*HZ;
1390 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1395 static int mos7720_ioctl(struct tty_struct *tty, struct file *file,
1396 unsigned int cmd, unsigned long arg)
1398 struct usb_serial_port *port = tty->driver_data;
1399 struct moschip_port *mos7720_port;
1400 struct async_icount cnow;
1401 struct async_icount cprev;
1402 struct serial_icounter_struct icount;
1404 mos7720_port = usb_get_serial_port_data(port);
1405 if (mos7720_port == NULL)
1408 dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
1412 /* return number of bytes available */
1413 dbg("%s (%d) TIOCINQ", __func__, port->number);
1414 return get_number_bytes_avail(mos7720_port,
1415 (unsigned int __user *)arg);
1419 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
1420 return get_lsr_info(tty, mos7720_port, (unsigned int __user *)arg);
1423 /* FIXME: These should be using the mode methods */
1427 dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET", __func__,
1429 return set_modem_info(mos7720_port, cmd,
1430 (unsigned int __user *)arg);
1433 dbg("%s (%d) TIOCMGET", __func__, port->number);
1434 return get_modem_info(mos7720_port,
1435 (unsigned int __user *)arg);
1438 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
1439 return get_serial_info(mos7720_port,
1440 (struct serial_struct __user *)arg);
1443 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
1444 cprev = mos7720_port->icount;
1446 if (signal_pending(current))
1447 return -ERESTARTSYS;
1448 cnow = mos7720_port->icount;
1449 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1450 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
1451 return -EIO; /* no change => error */
1452 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1453 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1454 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
1455 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1464 cnow = mos7720_port->icount;
1465 icount.cts = cnow.cts;
1466 icount.dsr = cnow.dsr;
1467 icount.rng = cnow.rng;
1468 icount.dcd = cnow.dcd;
1469 icount.rx = cnow.rx;
1470 icount.tx = cnow.tx;
1471 icount.frame = cnow.frame;
1472 icount.overrun = cnow.overrun;
1473 icount.parity = cnow.parity;
1474 icount.brk = cnow.brk;
1475 icount.buf_overrun = cnow.buf_overrun;
1477 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
1478 port->number, icount.rx, icount.tx );
1479 if (copy_to_user((void __user *)arg, &icount, sizeof(icount)))
1484 return -ENOIOCTLCMD;
1487 static int mos7720_startup(struct usb_serial *serial)
1489 struct moschip_serial *mos7720_serial;
1490 struct moschip_port *mos7720_port;
1491 struct usb_device *dev;
1495 dbg("%s: Entering ..........", __func__);
1498 dbg("Invalid Handler");
1504 /* create our private serial structure */
1505 mos7720_serial = kzalloc(sizeof(struct moschip_serial), GFP_KERNEL);
1506 if (mos7720_serial == NULL) {
1507 err("%s - Out of memory", __func__);
1511 usb_set_serial_data(serial, mos7720_serial);
1513 /* we set up the pointers to the endpoints in the mos7720_open *
1514 * function, as the structures aren't created yet. */
1516 /* set up port private structures */
1517 for (i = 0; i < serial->num_ports; ++i) {
1518 mos7720_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
1519 if (mos7720_port == NULL) {
1520 err("%s - Out of memory", __func__);
1521 usb_set_serial_data(serial, NULL);
1522 kfree(mos7720_serial);
1526 /* Initialize all port interrupt end point to port 0 int
1527 * endpoint. Our device has only one interrupt endpoint
1528 * comman to all ports */
1529 serial->port[i]->interrupt_in_endpointAddress = serial->port[0]->interrupt_in_endpointAddress;
1531 mos7720_port->port = serial->port[i];
1532 usb_set_serial_port_data(serial->port[i], mos7720_port);
1534 dbg("port number is %d", serial->port[i]->number);
1535 dbg("serial number is %d", serial->minor);
1539 /* setting configuration feature to one */
1540 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1541 (__u8)0x03, 0x00,0x01,0x00, NULL, 0x00, 5*HZ);
1543 send_mos_cmd(serial,MOS_READ,0x00, UART_LSR, &data); // LSR For Port 1
1546 send_mos_cmd(serial,MOS_READ,0x01, UART_LSR, &data); // LSR For Port 2
1552 static void mos7720_shutdown(struct usb_serial *serial)
1556 /* free private structure allocated for serial port */
1557 for (i=0; i < serial->num_ports; ++i) {
1558 kfree(usb_get_serial_port_data(serial->port[i]));
1559 usb_set_serial_port_data(serial->port[i], NULL);
1562 /* free private structure allocated for serial device */
1563 kfree(usb_get_serial_data(serial));
1564 usb_set_serial_data(serial, NULL);
1567 static struct usb_driver usb_driver = {
1568 .name = "moschip7720",
1569 .probe = usb_serial_probe,
1570 .disconnect = usb_serial_disconnect,
1571 .id_table = moschip_port_id_table,
1575 static struct usb_serial_driver moschip7720_2port_driver = {
1577 .owner = THIS_MODULE,
1578 .name = "moschip7720",
1580 .description = "Moschip 2 port adapter",
1581 .usb_driver = &usb_driver,
1582 .id_table = moschip_port_id_table,
1584 .open = mos7720_open,
1585 .close = mos7720_close,
1586 .throttle = mos7720_throttle,
1587 .unthrottle = mos7720_unthrottle,
1588 .attach = mos7720_startup,
1589 .shutdown = mos7720_shutdown,
1590 .ioctl = mos7720_ioctl,
1591 .set_termios = mos7720_set_termios,
1592 .write = mos7720_write,
1593 .write_room = mos7720_write_room,
1594 .chars_in_buffer = mos7720_chars_in_buffer,
1595 .break_ctl = mos7720_break,
1596 .read_bulk_callback = mos7720_bulk_in_callback,
1597 .read_int_callback = mos7720_interrupt_callback,
1600 static int __init moschip7720_init(void)
1604 dbg("%s: Entering ..........", __func__);
1606 /* Register with the usb serial */
1607 retval = usb_serial_register(&moschip7720_2port_driver);
1609 goto failed_port_device_register;
1611 info(DRIVER_DESC " " DRIVER_VERSION);
1613 /* Register with the usb */
1614 retval = usb_register(&usb_driver);
1616 goto failed_usb_register;
1620 failed_usb_register:
1621 usb_serial_deregister(&moschip7720_2port_driver);
1623 failed_port_device_register:
1627 static void __exit moschip7720_exit(void)
1629 usb_deregister(&usb_driver);
1630 usb_serial_deregister(&moschip7720_2port_driver);
1633 module_init(moschip7720_init);
1634 module_exit(moschip7720_exit);
1636 /* Module information */
1637 MODULE_AUTHOR( DRIVER_AUTHOR );
1638 MODULE_DESCRIPTION( DRIVER_DESC );
1639 MODULE_LICENSE("GPL");
1641 module_param(debug, bool, S_IRUGO | S_IWUSR);
1642 MODULE_PARM_DESC(debug, "Debug enabled or not");