2 * Silicon Laboratories CP2101/CP2102 USB to RS232 serial adaptor driver
4 * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License version
8 * 2 as published by the Free Software Foundation.
10 * Support to set flow control line levels using TIOCMGET and TIOCMSET
11 * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow
12 * control thanks to Munir Nassar nassarmu@real-time.com
16 #include <linux/kernel.h>
17 #include <linux/errno.h>
18 #include <linux/slab.h>
19 #include <linux/tty.h>
20 #include <linux/tty_flip.h>
21 #include <linux/module.h>
22 #include <linux/moduleparam.h>
23 #include <linux/usb.h>
24 #include <linux/uaccess.h>
25 #include <linux/usb/serial.h>
30 #define DRIVER_VERSION "v0.08"
31 #define DRIVER_DESC "Silicon Labs CP2101/CP2102 RS232 serial adaptor driver"
36 static int cp2101_open(struct tty_struct *, struct usb_serial_port *,
38 static void cp2101_cleanup(struct usb_serial_port *);
39 static void cp2101_close(struct usb_serial_port *);
40 static void cp2101_get_termios(struct tty_struct *,
41 struct usb_serial_port *port);
42 static void cp2101_get_termios_port(struct usb_serial_port *port,
43 unsigned int *cflagp, unsigned int *baudp);
44 static void cp2101_set_termios(struct tty_struct *, struct usb_serial_port *,
46 static int cp2101_tiocmget(struct tty_struct *, struct file *);
47 static int cp2101_tiocmset(struct tty_struct *, struct file *,
48 unsigned int, unsigned int);
49 static int cp2101_tiocmset_port(struct usb_serial_port *port, struct file *,
50 unsigned int, unsigned int);
51 static void cp2101_break_ctl(struct tty_struct *, int);
52 static int cp2101_startup(struct usb_serial *);
53 static void cp2101_shutdown(struct usb_serial *);
57 static struct usb_device_id id_table [] = {
58 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
59 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
60 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
61 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
62 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
63 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
64 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
65 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
66 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
67 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
68 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
69 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
70 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
71 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
72 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
73 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
74 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
75 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
76 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
77 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
78 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
79 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
80 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
81 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
82 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
83 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
84 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
85 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
86 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
87 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
88 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
89 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
90 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
91 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
92 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
93 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demostration module */
94 { USB_DEVICE(0x10c4, 0x8293) }, /* Telegesys ETRX2USB */
95 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
96 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
97 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
98 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
99 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
100 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
101 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
102 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
103 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
104 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
105 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
106 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
107 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
108 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
109 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
110 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
111 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
112 { } /* Terminating Entry */
115 MODULE_DEVICE_TABLE(usb, id_table);
117 static struct usb_driver cp2101_driver = {
119 .probe = usb_serial_probe,
120 .disconnect = usb_serial_disconnect,
121 .id_table = id_table,
125 static struct usb_serial_driver cp2101_device = {
127 .owner = THIS_MODULE,
130 .usb_driver = &cp2101_driver,
131 .id_table = id_table,
134 .close = cp2101_close,
135 .break_ctl = cp2101_break_ctl,
136 .set_termios = cp2101_set_termios,
137 .tiocmget = cp2101_tiocmget,
138 .tiocmset = cp2101_tiocmset,
139 .attach = cp2101_startup,
140 .shutdown = cp2101_shutdown,
143 /* Config request types */
144 #define REQTYPE_HOST_TO_DEVICE 0x41
145 #define REQTYPE_DEVICE_TO_HOST 0xc1
147 /* Config SET requests. To GET, add 1 to the request number */
148 #define CP2101_UART 0x00 /* Enable / Disable */
149 #define CP2101_BAUDRATE 0x01 /* (BAUD_RATE_GEN_FREQ / baudrate) */
150 #define CP2101_BITS 0x03 /* 0x(0)(databits)(parity)(stopbits) */
151 #define CP2101_BREAK 0x05 /* On / Off */
152 #define CP2101_CONTROL 0x07 /* Flow control line states */
153 #define CP2101_MODEMCTL 0x13 /* Modem controls */
154 #define CP2101_CONFIG_6 0x19 /* 6 bytes of config data ??? */
157 #define UART_ENABLE 0x0001
158 #define UART_DISABLE 0x0000
160 /* CP2101_BAUDRATE */
161 #define BAUD_RATE_GEN_FREQ 0x384000
164 #define BITS_DATA_MASK 0X0f00
165 #define BITS_DATA_5 0X0500
166 #define BITS_DATA_6 0X0600
167 #define BITS_DATA_7 0X0700
168 #define BITS_DATA_8 0X0800
169 #define BITS_DATA_9 0X0900
171 #define BITS_PARITY_MASK 0x00f0
172 #define BITS_PARITY_NONE 0x0000
173 #define BITS_PARITY_ODD 0x0010
174 #define BITS_PARITY_EVEN 0x0020
175 #define BITS_PARITY_MARK 0x0030
176 #define BITS_PARITY_SPACE 0x0040
178 #define BITS_STOP_MASK 0x000f
179 #define BITS_STOP_1 0x0000
180 #define BITS_STOP_1_5 0x0001
181 #define BITS_STOP_2 0x0002
184 #define BREAK_ON 0x0000
185 #define BREAK_OFF 0x0001
188 #define CONTROL_DTR 0x0001
189 #define CONTROL_RTS 0x0002
190 #define CONTROL_CTS 0x0010
191 #define CONTROL_DSR 0x0020
192 #define CONTROL_RING 0x0040
193 #define CONTROL_DCD 0x0080
194 #define CONTROL_WRITE_DTR 0x0100
195 #define CONTROL_WRITE_RTS 0x0200
199 * Reads from the CP2101 configuration registers
200 * 'size' is specified in bytes.
201 * 'data' is a pointer to a pre-allocated array of integers large
202 * enough to hold 'size' bytes (with 4 bytes to each integer)
204 static int cp2101_get_config(struct usb_serial_port *port, u8 request,
205 unsigned int *data, int size)
207 struct usb_serial *serial = port->serial;
209 int result, i, length;
211 /* Number of integers required to contain the array */
212 length = (((size - 1) | 3) + 1)/4;
214 buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
216 dev_err(&port->dev, "%s - out of memory.\n", __func__);
220 /* For get requests, the request number must be incremented */
223 /* Issue the request, attempting to read 'size' bytes */
224 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
225 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
228 /* Convert data into an array of integers */
229 for (i = 0; i < length; i++)
230 data[i] = le32_to_cpu(buf[i]);
234 if (result != size) {
235 dbg("%s - Unable to send config request, "
236 "request=0x%x size=%d result=%d\n",
237 __func__, request, size, result);
246 * Writes to the CP2101 configuration registers
247 * Values less than 16 bits wide are sent directly
248 * 'size' is specified in bytes.
250 static int cp2101_set_config(struct usb_serial_port *port, u8 request,
251 unsigned int *data, int size)
253 struct usb_serial *serial = port->serial;
255 int result, i, length;
257 /* Number of integers required to contain the array */
258 length = (((size - 1) | 3) + 1)/4;
260 buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
262 dev_err(&port->dev, "%s - out of memory.\n",
267 /* Array of integers into bytes */
268 for (i = 0; i < length; i++)
269 buf[i] = cpu_to_le32(data[i]);
272 result = usb_control_msg(serial->dev,
273 usb_sndctrlpipe(serial->dev, 0),
274 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
277 result = usb_control_msg(serial->dev,
278 usb_sndctrlpipe(serial->dev, 0),
279 request, REQTYPE_HOST_TO_DEVICE, data[0],
285 if ((size > 2 && result != size) || result < 0) {
286 dbg("%s - Unable to send request, "
287 "request=0x%x size=%d result=%d\n",
288 __func__, request, size, result);
292 /* Single data value */
293 result = usb_control_msg(serial->dev,
294 usb_sndctrlpipe(serial->dev, 0),
295 request, REQTYPE_HOST_TO_DEVICE, data[0],
301 * cp2101_set_config_single
302 * Convenience function for calling cp2101_set_config on single data values
303 * without requiring an integer pointer
305 static inline int cp2101_set_config_single(struct usb_serial_port *port,
306 u8 request, unsigned int data)
308 return cp2101_set_config(port, request, &data, 2);
312 * cp2101_quantise_baudrate
313 * Quantises the baud rate as per AN205 Table 1
315 static unsigned int cp2101_quantise_baudrate(unsigned int baud) {
316 if (baud <= 56) baud = 0;
317 else if (baud <= 300) baud = 300;
318 else if (baud <= 600) baud = 600;
319 else if (baud <= 1200) baud = 1200;
320 else if (baud <= 1800) baud = 1800;
321 else if (baud <= 2400) baud = 2400;
322 else if (baud <= 4000) baud = 4000;
323 else if (baud <= 4803) baud = 4800;
324 else if (baud <= 7207) baud = 7200;
325 else if (baud <= 9612) baud = 9600;
326 else if (baud <= 14428) baud = 14400;
327 else if (baud <= 16062) baud = 16000;
328 else if (baud <= 19250) baud = 19200;
329 else if (baud <= 28912) baud = 28800;
330 else if (baud <= 38601) baud = 38400;
331 else if (baud <= 51558) baud = 51200;
332 else if (baud <= 56280) baud = 56000;
333 else if (baud <= 58053) baud = 57600;
334 else if (baud <= 64111) baud = 64000;
335 else if (baud <= 77608) baud = 76800;
336 else if (baud <= 117028) baud = 115200;
337 else if (baud <= 129347) baud = 128000;
338 else if (baud <= 156868) baud = 153600;
339 else if (baud <= 237832) baud = 230400;
340 else if (baud <= 254234) baud = 250000;
341 else if (baud <= 273066) baud = 256000;
342 else if (baud <= 491520) baud = 460800;
343 else if (baud <= 567138) baud = 500000;
344 else if (baud <= 670254) baud = 576000;
345 else if (baud <= 1053257) baud = 921600;
346 else if (baud <= 1474560) baud = 1228800;
347 else if (baud <= 2457600) baud = 1843200;
352 static int cp2101_open(struct tty_struct *tty, struct usb_serial_port *port,
355 struct usb_serial *serial = port->serial;
358 dbg("%s - port %d", __func__, port->number);
360 if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) {
361 dev_err(&port->dev, "%s - Unable to enable UART\n",
366 /* Start reading from the device */
367 usb_fill_bulk_urb(port->read_urb, serial->dev,
368 usb_rcvbulkpipe(serial->dev,
369 port->bulk_in_endpointAddress),
370 port->read_urb->transfer_buffer,
371 port->read_urb->transfer_buffer_length,
372 serial->type->read_bulk_callback,
374 result = usb_submit_urb(port->read_urb, GFP_KERNEL);
376 dev_err(&port->dev, "%s - failed resubmitting read urb, "
377 "error %d\n", __func__, result);
381 /* Configure the termios structure */
382 cp2101_get_termios(tty, port);
384 /* Set the DTR and RTS pins low */
385 cp2101_tiocmset_port(tty ? (struct usb_serial_port *) tty->driver_data
387 NULL, TIOCM_DTR | TIOCM_RTS, 0);
392 static void cp2101_cleanup(struct usb_serial_port *port)
394 struct usb_serial *serial = port->serial;
396 dbg("%s - port %d", __func__, port->number);
399 /* shutdown any bulk reads that might be going on */
400 if (serial->num_bulk_out)
401 usb_kill_urb(port->write_urb);
402 if (serial->num_bulk_in)
403 usb_kill_urb(port->read_urb);
407 static void cp2101_close(struct usb_serial_port *port)
409 dbg("%s - port %d", __func__, port->number);
411 /* shutdown our urbs */
412 dbg("%s - shutting down urbs", __func__);
413 usb_kill_urb(port->write_urb);
414 usb_kill_urb(port->read_urb);
416 mutex_lock(&port->serial->disc_mutex);
417 if (!port->serial->disconnected)
418 cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
419 mutex_unlock(&port->serial->disc_mutex);
424 * Reads the baud rate, data bits, parity, stop bits and flow control mode
425 * from the device, corrects any unsupported values, and configures the
426 * termios structure to reflect the state of the device
428 static void cp2101_get_termios(struct tty_struct *tty,
429 struct usb_serial_port *port)
434 cp2101_get_termios_port(tty->driver_data,
435 &tty->termios->c_cflag, &baud);
436 tty_encode_baud_rate(tty, baud, baud);
442 cp2101_get_termios_port(port, &cflag, &baud);
447 * cp2101_get_termios_port
448 * This is the heart of cp2101_get_termios which always uses a &usb_serial_port.
450 static void cp2101_get_termios_port(struct usb_serial_port *port,
451 unsigned int *cflagp, unsigned int *baudp)
453 unsigned int cflag, modem_ctl[4];
457 dbg("%s - port %d", __func__, port->number);
459 cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2);
460 /* Convert to baudrate */
462 baud = cp2101_quantise_baudrate((BAUD_RATE_GEN_FREQ + baud/2)/ baud);
464 dbg("%s - baud rate = %d", __func__, baud);
469 cp2101_get_config(port, CP2101_BITS, &bits, 2);
471 switch (bits & BITS_DATA_MASK) {
473 dbg("%s - data bits = 5", __func__);
477 dbg("%s - data bits = 6", __func__);
481 dbg("%s - data bits = 7", __func__);
485 dbg("%s - data bits = 8", __func__);
489 dbg("%s - data bits = 9 (not supported, using 8 data bits)",
492 bits &= ~BITS_DATA_MASK;
494 cp2101_set_config(port, CP2101_BITS, &bits, 2);
497 dbg("%s - Unknown number of data bits, using 8", __func__);
499 bits &= ~BITS_DATA_MASK;
501 cp2101_set_config(port, CP2101_BITS, &bits, 2);
505 switch (bits & BITS_PARITY_MASK) {
506 case BITS_PARITY_NONE:
507 dbg("%s - parity = NONE", __func__);
510 case BITS_PARITY_ODD:
511 dbg("%s - parity = ODD", __func__);
512 cflag |= (PARENB|PARODD);
514 case BITS_PARITY_EVEN:
515 dbg("%s - parity = EVEN", __func__);
519 case BITS_PARITY_MARK:
520 dbg("%s - parity = MARK (not supported, disabling parity)",
523 bits &= ~BITS_PARITY_MASK;
524 cp2101_set_config(port, CP2101_BITS, &bits, 2);
526 case BITS_PARITY_SPACE:
527 dbg("%s - parity = SPACE (not supported, disabling parity)",
530 bits &= ~BITS_PARITY_MASK;
531 cp2101_set_config(port, CP2101_BITS, &bits, 2);
534 dbg("%s - Unknown parity mode, disabling parity", __func__);
536 bits &= ~BITS_PARITY_MASK;
537 cp2101_set_config(port, CP2101_BITS, &bits, 2);
542 switch (bits & BITS_STOP_MASK) {
544 dbg("%s - stop bits = 1", __func__);
547 dbg("%s - stop bits = 1.5 (not supported, using 1 stop bit)",
549 bits &= ~BITS_STOP_MASK;
550 cp2101_set_config(port, CP2101_BITS, &bits, 2);
553 dbg("%s - stop bits = 2", __func__);
557 dbg("%s - Unknown number of stop bits, using 1 stop bit",
559 bits &= ~BITS_STOP_MASK;
560 cp2101_set_config(port, CP2101_BITS, &bits, 2);
564 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
565 if (modem_ctl[0] & 0x0008) {
566 dbg("%s - flow control = CRTSCTS", __func__);
569 dbg("%s - flow control = NONE", __func__);
576 static void cp2101_set_termios(struct tty_struct *tty,
577 struct usb_serial_port *port, struct ktermios *old_termios)
579 unsigned int cflag, old_cflag;
580 unsigned int baud = 0, bits;
581 unsigned int modem_ctl[4];
583 dbg("%s - port %d", __func__, port->number);
588 tty->termios->c_cflag &= ~CMSPAR;
589 cflag = tty->termios->c_cflag;
590 old_cflag = old_termios->c_cflag;
591 baud = cp2101_quantise_baudrate(tty_get_baud_rate(tty));
593 /* If the baud rate is to be updated*/
594 if (baud != tty_termios_baud_rate(old_termios) && baud != 0) {
595 dbg("%s - Setting baud rate to %d baud", __func__,
597 if (cp2101_set_config_single(port, CP2101_BAUDRATE,
598 ((BAUD_RATE_GEN_FREQ + baud/2) / baud))) {
599 dbg("Baud rate requested not supported by device\n");
600 baud = tty_termios_baud_rate(old_termios);
603 /* Report back the resulting baud rate */
604 tty_encode_baud_rate(tty, baud, baud);
606 /* If the number of data bits is to be updated */
607 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
608 cp2101_get_config(port, CP2101_BITS, &bits, 2);
609 bits &= ~BITS_DATA_MASK;
610 switch (cflag & CSIZE) {
613 dbg("%s - data bits = 5", __func__);
617 dbg("%s - data bits = 6", __func__);
621 dbg("%s - data bits = 7", __func__);
625 dbg("%s - data bits = 8", __func__);
629 dbg("%s - data bits = 9", __func__);
632 dbg("cp2101 driver does not "
633 "support the number of bits requested,"
634 " using 8 bit mode\n");
638 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
639 dbg("Number of data bits requested "
640 "not supported by device\n");
643 if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
644 cp2101_get_config(port, CP2101_BITS, &bits, 2);
645 bits &= ~BITS_PARITY_MASK;
646 if (cflag & PARENB) {
647 if (cflag & PARODD) {
648 bits |= BITS_PARITY_ODD;
649 dbg("%s - parity = ODD", __func__);
651 bits |= BITS_PARITY_EVEN;
652 dbg("%s - parity = EVEN", __func__);
655 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
656 dbg("Parity mode not supported "
660 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
661 cp2101_get_config(port, CP2101_BITS, &bits, 2);
662 bits &= ~BITS_STOP_MASK;
663 if (cflag & CSTOPB) {
665 dbg("%s - stop bits = 2", __func__);
668 dbg("%s - stop bits = 1", __func__);
670 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
671 dbg("Number of stop bits requested "
672 "not supported by device\n");
675 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
676 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
677 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
678 __func__, modem_ctl[0], modem_ctl[1],
679 modem_ctl[2], modem_ctl[3]);
681 if (cflag & CRTSCTS) {
682 modem_ctl[0] &= ~0x7B;
683 modem_ctl[0] |= 0x09;
685 dbg("%s - flow control = CRTSCTS", __func__);
687 modem_ctl[0] &= ~0x7B;
688 modem_ctl[0] |= 0x01;
689 modem_ctl[1] |= 0x40;
690 dbg("%s - flow control = NONE", __func__);
693 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
694 __func__, modem_ctl[0], modem_ctl[1],
695 modem_ctl[2], modem_ctl[3]);
696 cp2101_set_config(port, CP2101_MODEMCTL, modem_ctl, 16);
701 static int cp2101_tiocmset (struct tty_struct *tty, struct file *file,
702 unsigned int set, unsigned int clear)
704 struct usb_serial_port *port = tty->driver_data;
705 return cp2101_tiocmset_port(port, file, set, clear);
708 static int cp2101_tiocmset_port(struct usb_serial_port *port, struct file *file,
709 unsigned int set, unsigned int clear)
711 unsigned int control = 0;
713 dbg("%s - port %d", __func__, port->number);
715 if (set & TIOCM_RTS) {
716 control |= CONTROL_RTS;
717 control |= CONTROL_WRITE_RTS;
719 if (set & TIOCM_DTR) {
720 control |= CONTROL_DTR;
721 control |= CONTROL_WRITE_DTR;
723 if (clear & TIOCM_RTS) {
724 control &= ~CONTROL_RTS;
725 control |= CONTROL_WRITE_RTS;
727 if (clear & TIOCM_DTR) {
728 control &= ~CONTROL_DTR;
729 control |= CONTROL_WRITE_DTR;
732 dbg("%s - control = 0x%.4x", __func__, control);
734 return cp2101_set_config(port, CP2101_CONTROL, &control, 2);
737 static int cp2101_tiocmget (struct tty_struct *tty, struct file *file)
739 struct usb_serial_port *port = tty->driver_data;
740 unsigned int control;
743 dbg("%s - port %d", __func__, port->number);
745 cp2101_get_config(port, CP2101_CONTROL, &control, 1);
747 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
748 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
749 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
750 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
751 |((control & CONTROL_RING)? TIOCM_RI : 0)
752 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
754 dbg("%s - control = 0x%.2x", __func__, control);
759 static void cp2101_break_ctl (struct tty_struct *tty, int break_state)
761 struct usb_serial_port *port = tty->driver_data;
764 dbg("%s - port %d", __func__, port->number);
765 if (break_state == 0)
769 dbg("%s - turning break %s", __func__,
770 state == BREAK_OFF ? "off" : "on");
771 cp2101_set_config(port, CP2101_BREAK, &state, 2);
774 static int cp2101_startup(struct usb_serial *serial)
776 /* CP2101 buffers behave strangely unless device is reset */
777 usb_reset_device(serial->dev);
781 static void cp2101_shutdown(struct usb_serial *serial)
787 /* Stop reads and writes on all ports */
788 for (i = 0; i < serial->num_ports; ++i)
789 cp2101_cleanup(serial->port[i]);
792 static int __init cp2101_init(void)
796 retval = usb_serial_register(&cp2101_device);
798 return retval; /* Failed to register */
800 retval = usb_register(&cp2101_driver);
802 /* Failed to register */
803 usb_serial_deregister(&cp2101_device);
808 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
813 static void __exit cp2101_exit(void)
815 usb_deregister(&cp2101_driver);
816 usb_serial_deregister(&cp2101_device);
819 module_init(cp2101_init);
820 module_exit(cp2101_exit);
822 MODULE_DESCRIPTION(DRIVER_DESC);
823 MODULE_VERSION(DRIVER_VERSION);
824 MODULE_LICENSE("GPL");
826 module_param(debug, bool, S_IRUGO | S_IWUSR);
827 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");