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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>
26
27#define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
28
29
30
31
32static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
33static void cp210x_close(struct usb_serial_port *);
34static void cp210x_get_termios(struct tty_struct *, struct usb_serial_port *);
35static void cp210x_get_termios_port(struct usb_serial_port *port,
36 unsigned int *cflagp, unsigned int *baudp);
37static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *,
38 struct ktermios *);
39static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
40 struct ktermios*);
41static int cp210x_tiocmget(struct tty_struct *);
42static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
43static int cp210x_tiocmset_port(struct usb_serial_port *port,
44 unsigned int, unsigned int);
45static void cp210x_break_ctl(struct tty_struct *, int);
46static int cp210x_startup(struct usb_serial *);
47static void cp210x_release(struct usb_serial *);
48static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
49
50static const struct usb_device_id id_table[] = {
51 { USB_DEVICE(0x045B, 0x0053) },
52 { USB_DEVICE(0x0471, 0x066A) },
53 { USB_DEVICE(0x0489, 0xE000) },
54 { USB_DEVICE(0x0489, 0xE003) },
55 { USB_DEVICE(0x0745, 0x1000) },
56 { USB_DEVICE(0x0846, 0x1100) },
57 { USB_DEVICE(0x08e6, 0x5501) },
58 { USB_DEVICE(0x08FD, 0x000A) },
59 { USB_DEVICE(0x0908, 0x01FF) },
60 { USB_DEVICE(0x0BED, 0x1100) },
61 { USB_DEVICE(0x0BED, 0x1101) },
62 { USB_DEVICE(0x0FCF, 0x1003) },
63 { USB_DEVICE(0x0FCF, 0x1004) },
64 { USB_DEVICE(0x0FCF, 0x1006) },
65 { USB_DEVICE(0x0FDE, 0xCA05) },
66 { USB_DEVICE(0x10A6, 0xAA26) },
67 { USB_DEVICE(0x10AB, 0x10C5) },
68 { USB_DEVICE(0x10B5, 0xAC70) },
69 { USB_DEVICE(0x10C4, 0x0F91) },
70 { USB_DEVICE(0x10C4, 0x1101) },
71 { USB_DEVICE(0x10C4, 0x1601) },
72 { USB_DEVICE(0x10C4, 0x800A) },
73 { USB_DEVICE(0x10C4, 0x803B) },
74 { USB_DEVICE(0x10C4, 0x8044) },
75 { USB_DEVICE(0x10C4, 0x804E) },
76 { USB_DEVICE(0x10C4, 0x8053) },
77 { USB_DEVICE(0x10C4, 0x8054) },
78 { USB_DEVICE(0x10C4, 0x8066) },
79 { USB_DEVICE(0x10C4, 0x806F) },
80 { USB_DEVICE(0x10C4, 0x807A) },
81 { USB_DEVICE(0x10C4, 0x80C4) },
82 { USB_DEVICE(0x10C4, 0x80CA) },
83 { USB_DEVICE(0x10C4, 0x80DD) },
84 { USB_DEVICE(0x10C4, 0x80F6) },
85 { USB_DEVICE(0x10C4, 0x8115) },
86 { USB_DEVICE(0x10C4, 0x813D) },
87 { USB_DEVICE(0x10C4, 0x813F) },
88 { USB_DEVICE(0x10C4, 0x814A) },
89 { USB_DEVICE(0x10C4, 0x814B) },
90 { USB_DEVICE(0x2405, 0x0003) },
91 { USB_DEVICE(0x10C4, 0x8156) },
92 { USB_DEVICE(0x10C4, 0x815E) },
93 { USB_DEVICE(0x10C4, 0x815F) },
94 { USB_DEVICE(0x10C4, 0x818B) },
95 { USB_DEVICE(0x10C4, 0x819F) },
96 { USB_DEVICE(0x10C4, 0x81A6) },
97 { USB_DEVICE(0x10C4, 0x81A9) },
98 { USB_DEVICE(0x10C4, 0x81AC) },
99 { USB_DEVICE(0x10C4, 0x81AD) },
100 { USB_DEVICE(0x10C4, 0x81C8) },
101 { USB_DEVICE(0x10C4, 0x81E2) },
102 { USB_DEVICE(0x10C4, 0x81E7) },
103 { USB_DEVICE(0x10C4, 0x81E8) },
104 { USB_DEVICE(0x10C4, 0x81F2) },
105 { USB_DEVICE(0x10C4, 0x8218) },
106 { USB_DEVICE(0x10C4, 0x822B) },
107 { USB_DEVICE(0x10C4, 0x826B) },
108 { USB_DEVICE(0x10C4, 0x8281) },
109 { USB_DEVICE(0x10C4, 0x8293) },
110 { USB_DEVICE(0x10C4, 0x82F9) },
111 { USB_DEVICE(0x10C4, 0x8341) },
112 { USB_DEVICE(0x10C4, 0x8382) },
113 { USB_DEVICE(0x10C4, 0x83A8) },
114 { USB_DEVICE(0x10C4, 0x83D8) },
115 { USB_DEVICE(0x10C4, 0x8411) },
116 { USB_DEVICE(0x10C4, 0x8418) },
117 { USB_DEVICE(0x10C4, 0x846E) },
118 { USB_DEVICE(0x10C4, 0x8477) },
119 { USB_DEVICE(0x10C4, 0x85EA) },
120 { USB_DEVICE(0x10C4, 0x85EB) },
121 { USB_DEVICE(0x10C4, 0x85F8) },
122 { USB_DEVICE(0x10C4, 0x8664) },
123 { USB_DEVICE(0x10C4, 0x8665) },
124 { USB_DEVICE(0x10C4, 0x8856) },
125 { USB_DEVICE(0x10C4, 0x8857) },
126 { USB_DEVICE(0x10C4, 0x88A4) },
127 { USB_DEVICE(0x10C4, 0x88A5) },
128 { USB_DEVICE(0x10C4, 0x8946) },
129 { USB_DEVICE(0x10C4, 0x8977) },
130 { USB_DEVICE(0x10C4, 0x8998) },
131 { USB_DEVICE(0x10C4, 0x8A2A) },
132 { USB_DEVICE(0x10C4, 0xEA60) },
133 { USB_DEVICE(0x10C4, 0xEA61) },
134 { USB_DEVICE(0x10C4, 0xEA70) },
135 { USB_DEVICE(0x10C4, 0xEA80) },
136 { USB_DEVICE(0x10C4, 0xEA71) },
137 { USB_DEVICE(0x10C4, 0xF001) },
138 { USB_DEVICE(0x10C4, 0xF002) },
139 { USB_DEVICE(0x10C4, 0xF003) },
140 { USB_DEVICE(0x10C4, 0xF004) },
141 { USB_DEVICE(0x10C5, 0xEA61) },
142 { USB_DEVICE(0x10CE, 0xEA6A) },
143 { USB_DEVICE(0x13AD, 0x9999) },
144 { USB_DEVICE(0x1555, 0x0004) },
145 { USB_DEVICE(0x166A, 0x0201) },
146 { USB_DEVICE(0x166A, 0x0301) },
147 { USB_DEVICE(0x166A, 0x0303) },
148 { USB_DEVICE(0x166A, 0x0304) },
149 { USB_DEVICE(0x166A, 0x0305) },
150 { USB_DEVICE(0x166A, 0x0401) },
151 { USB_DEVICE(0x166A, 0x0101) },
152 { USB_DEVICE(0x16C0, 0x09B0) },
153 { USB_DEVICE(0x16C0, 0x09B1) },
154 { USB_DEVICE(0x16D6, 0x0001) },
155 { USB_DEVICE(0x16DC, 0x0010) },
156 { USB_DEVICE(0x16DC, 0x0011) },
157 { USB_DEVICE(0x16DC, 0x0012) },
158 { USB_DEVICE(0x16DC, 0x0015) },
159 { USB_DEVICE(0x17A8, 0x0001) },
160 { USB_DEVICE(0x17A8, 0x0005) },
161 { USB_DEVICE(0x17F4, 0xAAAA) },
162 { USB_DEVICE(0x1843, 0x0200) },
163 { USB_DEVICE(0x18EF, 0xE00F) },
164 { USB_DEVICE(0x1ADB, 0x0001) },
165 { USB_DEVICE(0x1B1C, 0x1C00) },
166 { USB_DEVICE(0x1BA4, 0x0002) },
167 { USB_DEVICE(0x1BE3, 0x07A6) },
168 { USB_DEVICE(0x1D6F, 0x0010) },
169 { USB_DEVICE(0x1E29, 0x0102) },
170 { USB_DEVICE(0x1E29, 0x0501) },
171 { USB_DEVICE(0x1FB9, 0x0100) },
172 { USB_DEVICE(0x1FB9, 0x0200) },
173 { USB_DEVICE(0x1FB9, 0x0201) },
174 { USB_DEVICE(0x1FB9, 0x0202) },
175 { USB_DEVICE(0x1FB9, 0x0203) },
176 { USB_DEVICE(0x1FB9, 0x0300) },
177 { USB_DEVICE(0x1FB9, 0x0301) },
178 { USB_DEVICE(0x1FB9, 0x0302) },
179 { USB_DEVICE(0x1FB9, 0x0303) },
180 { USB_DEVICE(0x1FB9, 0x0400) },
181 { USB_DEVICE(0x1FB9, 0x0401) },
182 { USB_DEVICE(0x1FB9, 0x0402) },
183 { USB_DEVICE(0x1FB9, 0x0403) },
184 { USB_DEVICE(0x1FB9, 0x0404) },
185 { USB_DEVICE(0x1FB9, 0x0600) },
186 { USB_DEVICE(0x1FB9, 0x0601) },
187 { USB_DEVICE(0x1FB9, 0x0602) },
188 { USB_DEVICE(0x1FB9, 0x0700) },
189 { USB_DEVICE(0x1FB9, 0x0701) },
190 { USB_DEVICE(0x3195, 0xF190) },
191 { USB_DEVICE(0x3195, 0xF280) },
192 { USB_DEVICE(0x3195, 0xF281) },
193 { USB_DEVICE(0x413C, 0x9500) },
194 { }
195};
196
197MODULE_DEVICE_TABLE(usb, id_table);
198
199struct cp210x_serial_private {
200 __u8 bInterfaceNumber;
201};
202
203static struct usb_serial_driver cp210x_device = {
204 .driver = {
205 .owner = THIS_MODULE,
206 .name = "cp210x",
207 },
208 .id_table = id_table,
209 .num_ports = 1,
210 .bulk_in_size = 256,
211 .bulk_out_size = 256,
212 .open = cp210x_open,
213 .close = cp210x_close,
214 .break_ctl = cp210x_break_ctl,
215 .set_termios = cp210x_set_termios,
216 .tiocmget = cp210x_tiocmget,
217 .tiocmset = cp210x_tiocmset,
218 .attach = cp210x_startup,
219 .release = cp210x_release,
220 .dtr_rts = cp210x_dtr_rts
221};
222
223static struct usb_serial_driver * const serial_drivers[] = {
224 &cp210x_device, NULL
225};
226
227
228#define REQTYPE_HOST_TO_INTERFACE 0x41
229#define REQTYPE_INTERFACE_TO_HOST 0xc1
230#define REQTYPE_HOST_TO_DEVICE 0x40
231#define REQTYPE_DEVICE_TO_HOST 0xc0
232
233
234#define CP210X_IFC_ENABLE 0x00
235#define CP210X_SET_BAUDDIV 0x01
236#define CP210X_GET_BAUDDIV 0x02
237#define CP210X_SET_LINE_CTL 0x03
238#define CP210X_GET_LINE_CTL 0x04
239#define CP210X_SET_BREAK 0x05
240#define CP210X_IMM_CHAR 0x06
241#define CP210X_SET_MHS 0x07
242#define CP210X_GET_MDMSTS 0x08
243#define CP210X_SET_XON 0x09
244#define CP210X_SET_XOFF 0x0A
245#define CP210X_SET_EVENTMASK 0x0B
246#define CP210X_GET_EVENTMASK 0x0C
247#define CP210X_SET_CHAR 0x0D
248#define CP210X_GET_CHARS 0x0E
249#define CP210X_GET_PROPS 0x0F
250#define CP210X_GET_COMM_STATUS 0x10
251#define CP210X_RESET 0x11
252#define CP210X_PURGE 0x12
253#define CP210X_SET_FLOW 0x13
254#define CP210X_GET_FLOW 0x14
255#define CP210X_EMBED_EVENTS 0x15
256#define CP210X_GET_EVENTSTATE 0x16
257#define CP210X_SET_CHARS 0x19
258#define CP210X_GET_BAUDRATE 0x1D
259#define CP210X_SET_BAUDRATE 0x1E
260
261
262#define UART_ENABLE 0x0001
263#define UART_DISABLE 0x0000
264
265
266#define BAUD_RATE_GEN_FREQ 0x384000
267
268
269#define BITS_DATA_MASK 0X0f00
270#define BITS_DATA_5 0X0500
271#define BITS_DATA_6 0X0600
272#define BITS_DATA_7 0X0700
273#define BITS_DATA_8 0X0800
274#define BITS_DATA_9 0X0900
275
276#define BITS_PARITY_MASK 0x00f0
277#define BITS_PARITY_NONE 0x0000
278#define BITS_PARITY_ODD 0x0010
279#define BITS_PARITY_EVEN 0x0020
280#define BITS_PARITY_MARK 0x0030
281#define BITS_PARITY_SPACE 0x0040
282
283#define BITS_STOP_MASK 0x000f
284#define BITS_STOP_1 0x0000
285#define BITS_STOP_1_5 0x0001
286#define BITS_STOP_2 0x0002
287
288
289#define BREAK_ON 0x0001
290#define BREAK_OFF 0x0000
291
292
293#define CONTROL_DTR 0x0001
294#define CONTROL_RTS 0x0002
295#define CONTROL_CTS 0x0010
296#define CONTROL_DSR 0x0020
297#define CONTROL_RING 0x0040
298#define CONTROL_DCD 0x0080
299#define CONTROL_WRITE_DTR 0x0100
300#define CONTROL_WRITE_RTS 0x0200
301
302
303
304
305
306
307
308
309static int cp210x_get_config(struct usb_serial_port *port, u8 request,
310 unsigned int *data, int size)
311{
312 struct usb_serial *serial = port->serial;
313 struct cp210x_serial_private *spriv = usb_get_serial_data(serial);
314 __le32 *buf;
315 int result, i, length;
316
317
318 length = (((size - 1) | 3) + 1) / 4;
319
320 buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
321 if (!buf)
322 return -ENOMEM;
323
324
325 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
326 request, REQTYPE_INTERFACE_TO_HOST, 0x0000,
327 spriv->bInterfaceNumber, buf, size,
328 USB_CTRL_GET_TIMEOUT);
329
330
331 for (i = 0; i < length; i++)
332 data[i] = le32_to_cpu(buf[i]);
333
334 kfree(buf);
335
336 if (result != size) {
337 dev_dbg(&port->dev, "%s - Unable to send config request, request=0x%x size=%d result=%d\n",
338 __func__, request, size, result);
339 if (result > 0)
340 result = -EPROTO;
341
342 return result;
343 }
344
345 return 0;
346}
347
348
349
350
351
352
353
354static int cp210x_set_config(struct usb_serial_port *port, u8 request,
355 unsigned int *data, int size)
356{
357 struct usb_serial *serial = port->serial;
358 struct cp210x_serial_private *spriv = usb_get_serial_data(serial);
359 __le32 *buf;
360 int result, i, length;
361
362
363 length = (((size - 1) | 3) + 1) / 4;
364
365 buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
366 if (!buf)
367 return -ENOMEM;
368
369
370 for (i = 0; i < length; i++)
371 buf[i] = cpu_to_le32(data[i]);
372
373 if (size > 2) {
374 result = usb_control_msg(serial->dev,
375 usb_sndctrlpipe(serial->dev, 0),
376 request, REQTYPE_HOST_TO_INTERFACE, 0x0000,
377 spriv->bInterfaceNumber, buf, size,
378 USB_CTRL_SET_TIMEOUT);
379 } else {
380 result = usb_control_msg(serial->dev,
381 usb_sndctrlpipe(serial->dev, 0),
382 request, REQTYPE_HOST_TO_INTERFACE, data[0],
383 spriv->bInterfaceNumber, NULL, 0,
384 USB_CTRL_SET_TIMEOUT);
385 }
386
387 kfree(buf);
388
389 if ((size > 2 && result != size) || result < 0) {
390 dev_dbg(&port->dev, "%s - Unable to send request, request=0x%x size=%d result=%d\n",
391 __func__, request, size, result);
392 if (result > 0)
393 result = -EPROTO;
394
395 return result;
396 }
397
398 return 0;
399}
400
401
402
403
404
405
406static inline int cp210x_set_config_single(struct usb_serial_port *port,
407 u8 request, unsigned int data)
408{
409 return cp210x_set_config(port, request, &data, 2);
410}
411
412
413
414
415
416static unsigned int cp210x_quantise_baudrate(unsigned int baud)
417{
418 if (baud <= 300)
419 baud = 300;
420 else if (baud <= 600) baud = 600;
421 else if (baud <= 1200) baud = 1200;
422 else if (baud <= 1800) baud = 1800;
423 else if (baud <= 2400) baud = 2400;
424 else if (baud <= 4000) baud = 4000;
425 else if (baud <= 4803) baud = 4800;
426 else if (baud <= 7207) baud = 7200;
427 else if (baud <= 9612) baud = 9600;
428 else if (baud <= 14428) baud = 14400;
429 else if (baud <= 16062) baud = 16000;
430 else if (baud <= 19250) baud = 19200;
431 else if (baud <= 28912) baud = 28800;
432 else if (baud <= 38601) baud = 38400;
433 else if (baud <= 51558) baud = 51200;
434 else if (baud <= 56280) baud = 56000;
435 else if (baud <= 58053) baud = 57600;
436 else if (baud <= 64111) baud = 64000;
437 else if (baud <= 77608) baud = 76800;
438 else if (baud <= 117028) baud = 115200;
439 else if (baud <= 129347) baud = 128000;
440 else if (baud <= 156868) baud = 153600;
441 else if (baud <= 237832) baud = 230400;
442 else if (baud <= 254234) baud = 250000;
443 else if (baud <= 273066) baud = 256000;
444 else if (baud <= 491520) baud = 460800;
445 else if (baud <= 567138) baud = 500000;
446 else if (baud <= 670254) baud = 576000;
447 else if (baud < 1000000)
448 baud = 921600;
449 else if (baud > 2000000)
450 baud = 2000000;
451 return baud;
452}
453
454static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
455{
456 int result;
457
458 result = cp210x_set_config_single(port, CP210X_IFC_ENABLE,
459 UART_ENABLE);
460 if (result) {
461 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
462 return result;
463 }
464
465
466 cp210x_get_termios(tty, port);
467
468
469 if (tty)
470 cp210x_change_speed(tty, port, NULL);
471
472 return usb_serial_generic_open(tty, port);
473}
474
475static void cp210x_close(struct usb_serial_port *port)
476{
477 usb_serial_generic_close(port);
478 cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE);
479}
480
481
482
483
484
485
486
487static void cp210x_get_termios(struct tty_struct *tty,
488 struct usb_serial_port *port)
489{
490 unsigned int baud;
491
492 if (tty) {
493 cp210x_get_termios_port(tty->driver_data,
494 &tty->termios.c_cflag, &baud);
495 tty_encode_baud_rate(tty, baud, baud);
496 } else {
497 unsigned int cflag;
498 cflag = 0;
499 cp210x_get_termios_port(port, &cflag, &baud);
500 }
501}
502
503
504
505
506
507static void cp210x_get_termios_port(struct usb_serial_port *port,
508 unsigned int *cflagp, unsigned int *baudp)
509{
510 struct device *dev = &port->dev;
511 unsigned int cflag, modem_ctl[4];
512 unsigned int baud;
513 unsigned int bits;
514
515 cp210x_get_config(port, CP210X_GET_BAUDRATE, &baud, 4);
516
517 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
518 *baudp = baud;
519
520 cflag = *cflagp;
521
522 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
523 cflag &= ~CSIZE;
524 switch (bits & BITS_DATA_MASK) {
525 case BITS_DATA_5:
526 dev_dbg(dev, "%s - data bits = 5\n", __func__);
527 cflag |= CS5;
528 break;
529 case BITS_DATA_6:
530 dev_dbg(dev, "%s - data bits = 6\n", __func__);
531 cflag |= CS6;
532 break;
533 case BITS_DATA_7:
534 dev_dbg(dev, "%s - data bits = 7\n", __func__);
535 cflag |= CS7;
536 break;
537 case BITS_DATA_8:
538 dev_dbg(dev, "%s - data bits = 8\n", __func__);
539 cflag |= CS8;
540 break;
541 case BITS_DATA_9:
542 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
543 cflag |= CS8;
544 bits &= ~BITS_DATA_MASK;
545 bits |= BITS_DATA_8;
546 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
547 break;
548 default:
549 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
550 cflag |= CS8;
551 bits &= ~BITS_DATA_MASK;
552 bits |= BITS_DATA_8;
553 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
554 break;
555 }
556
557 switch (bits & BITS_PARITY_MASK) {
558 case BITS_PARITY_NONE:
559 dev_dbg(dev, "%s - parity = NONE\n", __func__);
560 cflag &= ~PARENB;
561 break;
562 case BITS_PARITY_ODD:
563 dev_dbg(dev, "%s - parity = ODD\n", __func__);
564 cflag |= (PARENB|PARODD);
565 break;
566 case BITS_PARITY_EVEN:
567 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
568 cflag &= ~PARODD;
569 cflag |= PARENB;
570 break;
571 case BITS_PARITY_MARK:
572 dev_dbg(dev, "%s - parity = MARK\n", __func__);
573 cflag |= (PARENB|PARODD|CMSPAR);
574 break;
575 case BITS_PARITY_SPACE:
576 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
577 cflag &= ~PARODD;
578 cflag |= (PARENB|CMSPAR);
579 break;
580 default:
581 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
582 cflag &= ~PARENB;
583 bits &= ~BITS_PARITY_MASK;
584 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
585 break;
586 }
587
588 cflag &= ~CSTOPB;
589 switch (bits & BITS_STOP_MASK) {
590 case BITS_STOP_1:
591 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
592 break;
593 case BITS_STOP_1_5:
594 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
595 bits &= ~BITS_STOP_MASK;
596 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
597 break;
598 case BITS_STOP_2:
599 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
600 cflag |= CSTOPB;
601 break;
602 default:
603 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
604 bits &= ~BITS_STOP_MASK;
605 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
606 break;
607 }
608
609 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
610 if (modem_ctl[0] & 0x0008) {
611 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
612 cflag |= CRTSCTS;
613 } else {
614 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
615 cflag &= ~CRTSCTS;
616 }
617
618 *cflagp = cflag;
619}
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647static void cp210x_change_speed(struct tty_struct *tty,
648 struct usb_serial_port *port, struct ktermios *old_termios)
649{
650 u32 baud;
651
652 baud = tty->termios.c_ospeed;
653
654
655
656
657
658
659 baud = cp210x_quantise_baudrate(baud);
660
661 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
662 if (cp210x_set_config(port, CP210X_SET_BAUDRATE, &baud,
663 sizeof(baud))) {
664 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
665 if (old_termios)
666 baud = old_termios->c_ospeed;
667 else
668 baud = 9600;
669 }
670
671 tty_encode_baud_rate(tty, baud, baud);
672}
673
674static void cp210x_set_termios(struct tty_struct *tty,
675 struct usb_serial_port *port, struct ktermios *old_termios)
676{
677 struct device *dev = &port->dev;
678 unsigned int cflag, old_cflag;
679 unsigned int bits;
680 unsigned int modem_ctl[4];
681
682 cflag = tty->termios.c_cflag;
683 old_cflag = old_termios->c_cflag;
684
685 if (tty->termios.c_ospeed != old_termios->c_ospeed)
686 cp210x_change_speed(tty, port, old_termios);
687
688
689 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
690 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
691 bits &= ~BITS_DATA_MASK;
692 switch (cflag & CSIZE) {
693 case CS5:
694 bits |= BITS_DATA_5;
695 dev_dbg(dev, "%s - data bits = 5\n", __func__);
696 break;
697 case CS6:
698 bits |= BITS_DATA_6;
699 dev_dbg(dev, "%s - data bits = 6\n", __func__);
700 break;
701 case CS7:
702 bits |= BITS_DATA_7;
703 dev_dbg(dev, "%s - data bits = 7\n", __func__);
704 break;
705 case CS8:
706 bits |= BITS_DATA_8;
707 dev_dbg(dev, "%s - data bits = 8\n", __func__);
708 break;
709
710
711
712
713 default:
714 dev_dbg(dev, "cp210x driver does not support the number of bits requested, using 8 bit mode\n");
715 bits |= BITS_DATA_8;
716 break;
717 }
718 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
719 dev_dbg(dev, "Number of data bits requested not supported by device\n");
720 }
721
722 if ((cflag & (PARENB|PARODD|CMSPAR)) !=
723 (old_cflag & (PARENB|PARODD|CMSPAR))) {
724 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
725 bits &= ~BITS_PARITY_MASK;
726 if (cflag & PARENB) {
727 if (cflag & CMSPAR) {
728 if (cflag & PARODD) {
729 bits |= BITS_PARITY_MARK;
730 dev_dbg(dev, "%s - parity = MARK\n", __func__);
731 } else {
732 bits |= BITS_PARITY_SPACE;
733 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
734 }
735 } else {
736 if (cflag & PARODD) {
737 bits |= BITS_PARITY_ODD;
738 dev_dbg(dev, "%s - parity = ODD\n", __func__);
739 } else {
740 bits |= BITS_PARITY_EVEN;
741 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
742 }
743 }
744 }
745 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
746 dev_dbg(dev, "Parity mode not supported by device\n");
747 }
748
749 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
750 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
751 bits &= ~BITS_STOP_MASK;
752 if (cflag & CSTOPB) {
753 bits |= BITS_STOP_2;
754 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
755 } else {
756 bits |= BITS_STOP_1;
757 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
758 }
759 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
760 dev_dbg(dev, "Number of stop bits requested not supported by device\n");
761 }
762
763 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
764 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
765 dev_dbg(dev, "%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n",
766 __func__, modem_ctl[0], modem_ctl[1],
767 modem_ctl[2], modem_ctl[3]);
768
769 if (cflag & CRTSCTS) {
770 modem_ctl[0] &= ~0x7B;
771 modem_ctl[0] |= 0x09;
772 modem_ctl[1] = 0x80;
773 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
774 } else {
775 modem_ctl[0] &= ~0x7B;
776 modem_ctl[0] |= 0x01;
777 modem_ctl[1] |= 0x40;
778 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
779 }
780
781 dev_dbg(dev, "%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n",
782 __func__, modem_ctl[0], modem_ctl[1],
783 modem_ctl[2], modem_ctl[3]);
784 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16);
785 }
786
787}
788
789static int cp210x_tiocmset(struct tty_struct *tty,
790 unsigned int set, unsigned int clear)
791{
792 struct usb_serial_port *port = tty->driver_data;
793 return cp210x_tiocmset_port(port, set, clear);
794}
795
796static int cp210x_tiocmset_port(struct usb_serial_port *port,
797 unsigned int set, unsigned int clear)
798{
799 unsigned int control = 0;
800
801 if (set & TIOCM_RTS) {
802 control |= CONTROL_RTS;
803 control |= CONTROL_WRITE_RTS;
804 }
805 if (set & TIOCM_DTR) {
806 control |= CONTROL_DTR;
807 control |= CONTROL_WRITE_DTR;
808 }
809 if (clear & TIOCM_RTS) {
810 control &= ~CONTROL_RTS;
811 control |= CONTROL_WRITE_RTS;
812 }
813 if (clear & TIOCM_DTR) {
814 control &= ~CONTROL_DTR;
815 control |= CONTROL_WRITE_DTR;
816 }
817
818 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
819
820 return cp210x_set_config(port, CP210X_SET_MHS, &control, 2);
821}
822
823static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
824{
825 if (on)
826 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
827 else
828 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
829}
830
831static int cp210x_tiocmget(struct tty_struct *tty)
832{
833 struct usb_serial_port *port = tty->driver_data;
834 unsigned int control;
835 int result;
836
837 cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1);
838
839 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
840 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
841 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
842 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
843 |((control & CONTROL_RING)? TIOCM_RI : 0)
844 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
845
846 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
847
848 return result;
849}
850
851static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
852{
853 struct usb_serial_port *port = tty->driver_data;
854 unsigned int state;
855
856 if (break_state == 0)
857 state = BREAK_OFF;
858 else
859 state = BREAK_ON;
860 dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
861 state == BREAK_OFF ? "off" : "on");
862 cp210x_set_config(port, CP210X_SET_BREAK, &state, 2);
863}
864
865static int cp210x_startup(struct usb_serial *serial)
866{
867 struct usb_host_interface *cur_altsetting;
868 struct cp210x_serial_private *spriv;
869
870 spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
871 if (!spriv)
872 return -ENOMEM;
873
874 cur_altsetting = serial->interface->cur_altsetting;
875 spriv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber;
876
877 usb_set_serial_data(serial, spriv);
878
879 return 0;
880}
881
882static void cp210x_release(struct usb_serial *serial)
883{
884 struct cp210x_serial_private *spriv;
885
886 spriv = usb_get_serial_data(serial);
887 kfree(spriv);
888}
889
890module_usb_serial_driver(serial_drivers, id_table);
891
892MODULE_DESCRIPTION(DRIVER_DESC);
893MODULE_LICENSE("GPL");
894