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Linux 4.16.11
[linux/fpc-iii.git] / drivers / usb / serial / pl2303.c
blob46dd09da2434d8f1e8a1e0adb9fd82de099fdb5a
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Prolific PL2303 USB to serial adaptor driver
4 *
5 * Copyright (C) 2001-2007 Greg Kroah-Hartman (greg@kroah.com)
6 * Copyright (C) 2003 IBM Corp.
7 *
8 * Original driver for 2.2.x by anonymous
9 *
10 * See Documentation/usb/usb-serial.txt for more information on using this
11 * driver
12 */
13
14 #include <linux/kernel.h>
15 #include <linux/errno.h>
16 #include <linux/slab.h>
17 #include <linux/tty.h>
18 #include <linux/tty_driver.h>
19 #include <linux/tty_flip.h>
20 #include <linux/serial.h>
21 #include <linux/module.h>
22 #include <linux/moduleparam.h>
23 #include <linux/spinlock.h>
24 #include <linux/uaccess.h>
25 #include <linux/usb.h>
26 #include <linux/usb/serial.h>
27 #include <asm/unaligned.h>
28 #include "pl2303.h"
29
30
31 #define PL2303_QUIRK_UART_STATE_IDX0 BIT(0)
32 #define PL2303_QUIRK_LEGACY BIT(1)
33 #define PL2303_QUIRK_ENDPOINT_HACK BIT(2)
34
35 static const struct usb_device_id id_table[] = {
36 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID),
37 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
38 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) },
39 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_DCU11) },
40 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ3) },
41 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_CHILITAG) },
42 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_PHAROS) },
43 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ALDIGA) },
44 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MMX) },
45 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GPRS) },
46 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_HCR331) },
47 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MOTOROLA) },
48 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ZTEK) },
49 { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
50 { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID_RSAQ5) },
51 { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID),
52 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
53 { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_UC485),
54 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
55 { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID2) },
56 { USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) },
57 { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },
58 { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) },
59 { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) },
60 { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID_2080) },
61 { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) },
62 { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) },
63 { USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) },
64 { USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) },
65 { USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) },
66 { USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) },
67 { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) },
68 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1),
69 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
70 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65),
71 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
72 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75),
73 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
74 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_EF81),
75 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
76 { USB_DEVICE(BENQ_VENDOR_ID, BENQ_PRODUCT_ID_S81) }, /* Benq/Siemens S81 */
77 { USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) },
78 { USB_DEVICE(NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID) },
79 { USB_DEVICE(CA_42_CA42_VENDOR_ID, CA_42_CA42_PRODUCT_ID) },
80 { USB_DEVICE(SAGEM_VENDOR_ID, SAGEM_PRODUCT_ID) },
81 { USB_DEVICE(LEADTEK_VENDOR_ID, LEADTEK_9531_PRODUCT_ID) },
82 { USB_DEVICE(SPEEDDRAGON_VENDOR_ID, SPEEDDRAGON_PRODUCT_ID) },
83 { USB_DEVICE(DATAPILOT_U2_VENDOR_ID, DATAPILOT_U2_PRODUCT_ID) },
84 { USB_DEVICE(BELKIN_VENDOR_ID, BELKIN_PRODUCT_ID) },
85 { USB_DEVICE(ALCOR_VENDOR_ID, ALCOR_PRODUCT_ID),
86 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
87 { USB_DEVICE(WS002IN_VENDOR_ID, WS002IN_PRODUCT_ID) },
88 { USB_DEVICE(COREGA_VENDOR_ID, COREGA_PRODUCT_ID) },
89 { USB_DEVICE(YCCABLE_VENDOR_ID, YCCABLE_PRODUCT_ID) },
90 { USB_DEVICE(SUPERIAL_VENDOR_ID, SUPERIAL_PRODUCT_ID) },
91 { USB_DEVICE(HP_VENDOR_ID, HP_LD220_PRODUCT_ID) },
92 { USB_DEVICE(HP_VENDOR_ID, HP_LD960_PRODUCT_ID) },
93 { USB_DEVICE(HP_VENDOR_ID, HP_LCM220_PRODUCT_ID) },
94 { USB_DEVICE(HP_VENDOR_ID, HP_LCM960_PRODUCT_ID) },
95 { USB_DEVICE(CRESSI_VENDOR_ID, CRESSI_EDY_PRODUCT_ID) },
96 { USB_DEVICE(ZEAGLE_VENDOR_ID, ZEAGLE_N2ITION3_PRODUCT_ID) },
97 { USB_DEVICE(SONY_VENDOR_ID, SONY_QN3USB_PRODUCT_ID) },
98 { USB_DEVICE(SANWA_VENDOR_ID, SANWA_PRODUCT_ID) },
99 { USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530_PRODUCT_ID) },
100 { USB_DEVICE(SMART_VENDOR_ID, SMART_PRODUCT_ID) },
101 { } /* Terminating entry */
102 };
103
104 MODULE_DEVICE_TABLE(usb, id_table);
105
106 #define SET_LINE_REQUEST_TYPE 0x21
107 #define SET_LINE_REQUEST 0x20
108
109 #define SET_CONTROL_REQUEST_TYPE 0x21
110 #define SET_CONTROL_REQUEST 0x22
111 #define CONTROL_DTR 0x01
112 #define CONTROL_RTS 0x02
113
114 #define BREAK_REQUEST_TYPE 0x21
115 #define BREAK_REQUEST 0x23
116 #define BREAK_ON 0xffff
117 #define BREAK_OFF 0x0000
118
119 #define GET_LINE_REQUEST_TYPE 0xa1
120 #define GET_LINE_REQUEST 0x21
121
122 #define VENDOR_WRITE_REQUEST_TYPE 0x40
123 #define VENDOR_WRITE_REQUEST 0x01
124
125 #define VENDOR_READ_REQUEST_TYPE 0xc0
126 #define VENDOR_READ_REQUEST 0x01
127
128 #define UART_STATE_INDEX 8
129 #define UART_STATE_MSR_MASK 0x8b
130 #define UART_STATE_TRANSIENT_MASK 0x74
131 #define UART_DCD 0x01
132 #define UART_DSR 0x02
133 #define UART_BREAK_ERROR 0x04
134 #define UART_RING 0x08
135 #define UART_FRAME_ERROR 0x10
136 #define UART_PARITY_ERROR 0x20
137 #define UART_OVERRUN_ERROR 0x40
138 #define UART_CTS 0x80
139
140 static void pl2303_set_break(struct usb_serial_port *port, bool enable);
141
142 enum pl2303_type {
143 TYPE_01, /* Type 0 and 1 (difference unknown) */
144 TYPE_HX, /* HX version of the pl2303 chip */
145 TYPE_COUNT
146 };
147
148 struct pl2303_type_data {
149 speed_t max_baud_rate;
150 unsigned long quirks;
151 };
152
153 struct pl2303_serial_private {
154 const struct pl2303_type_data *type;
155 unsigned long quirks;
156 };
157
158 struct pl2303_private {
159 spinlock_t lock;
160 u8 line_control;
161 u8 line_status;
162
163 u8 line_settings[7];
164 };
165
166 static const struct pl2303_type_data pl2303_type_data[TYPE_COUNT] = {
167 [TYPE_01] = {
168 .max_baud_rate = 1228800,
169 .quirks = PL2303_QUIRK_LEGACY,
170 },
171 [TYPE_HX] = {
172 .max_baud_rate = 12000000,
173 },
174 };
175
176 static int pl2303_vendor_read(struct usb_serial *serial, u16 value,
177 unsigned char buf[1])
178 {
179 struct device *dev = &serial->interface->dev;
180 int res;
181
182 res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
183 VENDOR_READ_REQUEST, VENDOR_READ_REQUEST_TYPE,
184 value, 0, buf, 1, 100);
185 if (res != 1) {
186 dev_err(dev, "%s - failed to read [%04x]: %d\n", __func__,
187 value, res);
188 if (res >= 0)
189 res = -EIO;
190
191 return res;
192 }
193
194 dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, buf[0]);
195
196 return 0;
197 }
198
199 static int pl2303_vendor_write(struct usb_serial *serial, u16 value, u16 index)
200 {
201 struct device *dev = &serial->interface->dev;
202 int res;
203
204 dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, index);
205
206 res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
207 VENDOR_WRITE_REQUEST, VENDOR_WRITE_REQUEST_TYPE,
208 value, index, NULL, 0, 100);
209 if (res) {
210 dev_err(dev, "%s - failed to write [%04x]: %d\n", __func__,
211 value, res);
212 return res;
213 }
214
215 return 0;
216 }
217
218 static int pl2303_probe(struct usb_serial *serial,
219 const struct usb_device_id *id)
220 {
221 usb_set_serial_data(serial, (void *)id->driver_info);
222
223 return 0;
224 }
225
226 /*
227 * Use interrupt endpoint from first interface if available.
228 *
229 * This is needed due to the looney way its endpoints are set up.
230 */
231 static int pl2303_endpoint_hack(struct usb_serial *serial,
232 struct usb_serial_endpoints *epds)
233 {
234 struct usb_interface *interface = serial->interface;
235 struct usb_device *dev = serial->dev;
236 struct device *ddev = &interface->dev;
237 struct usb_host_interface *iface_desc;
238 struct usb_endpoint_descriptor *endpoint;
239 unsigned int i;
240
241 if (interface == dev->actconfig->interface[0])
242 return 0;
243
244 /* check out the endpoints of the other interface */
245 iface_desc = dev->actconfig->interface[0]->cur_altsetting;
246
247 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
248 endpoint = &iface_desc->endpoint[i].desc;
249
250 if (!usb_endpoint_is_int_in(endpoint))
251 continue;
252
253 dev_dbg(ddev, "found interrupt in on separate interface\n");
254 if (epds->num_interrupt_in < ARRAY_SIZE(epds->interrupt_in))
255 epds->interrupt_in[epds->num_interrupt_in++] = endpoint;
256 }
257
258 return 0;
259 }
260
261 static int pl2303_calc_num_ports(struct usb_serial *serial,
262 struct usb_serial_endpoints *epds)
263 {
264 unsigned long quirks = (unsigned long)usb_get_serial_data(serial);
265 struct device *dev = &serial->interface->dev;
266 int ret;
267
268 if (quirks & PL2303_QUIRK_ENDPOINT_HACK) {
269 ret = pl2303_endpoint_hack(serial, epds);
270 if (ret)
271 return ret;
272 }
273
274 if (epds->num_interrupt_in < 1) {
275 dev_err(dev, "required interrupt-in endpoint missing\n");
276 return -ENODEV;
277 }
278
279 return 1;
280 }
281
282 static int pl2303_startup(struct usb_serial *serial)
283 {
284 struct pl2303_serial_private *spriv;
285 enum pl2303_type type = TYPE_01;
286 unsigned char *buf;
287
288 spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
289 if (!spriv)
290 return -ENOMEM;
291
292 buf = kmalloc(1, GFP_KERNEL);
293 if (!buf) {
294 kfree(spriv);
295 return -ENOMEM;
296 }
297
298 if (serial->dev->descriptor.bDeviceClass == 0x02)
299 type = TYPE_01; /* type 0 */
300 else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40)
301 type = TYPE_HX;
302 else if (serial->dev->descriptor.bDeviceClass == 0x00)
303 type = TYPE_01; /* type 1 */
304 else if (serial->dev->descriptor.bDeviceClass == 0xFF)
305 type = TYPE_01; /* type 1 */
306 dev_dbg(&serial->interface->dev, "device type: %d\n", type);
307
308 spriv->type = &pl2303_type_data[type];
309 spriv->quirks = (unsigned long)usb_get_serial_data(serial);
310 spriv->quirks |= spriv->type->quirks;
311
312 usb_set_serial_data(serial, spriv);
313
314 pl2303_vendor_read(serial, 0x8484, buf);
315 pl2303_vendor_write(serial, 0x0404, 0);
316 pl2303_vendor_read(serial, 0x8484, buf);
317 pl2303_vendor_read(serial, 0x8383, buf);
318 pl2303_vendor_read(serial, 0x8484, buf);
319 pl2303_vendor_write(serial, 0x0404, 1);
320 pl2303_vendor_read(serial, 0x8484, buf);
321 pl2303_vendor_read(serial, 0x8383, buf);
322 pl2303_vendor_write(serial, 0, 1);
323 pl2303_vendor_write(serial, 1, 0);
324 if (spriv->quirks & PL2303_QUIRK_LEGACY)
325 pl2303_vendor_write(serial, 2, 0x24);
326 else
327 pl2303_vendor_write(serial, 2, 0x44);
328
329 kfree(buf);
330
331 return 0;
332 }
333
334 static void pl2303_release(struct usb_serial *serial)
335 {
336 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
337
338 kfree(spriv);
339 }
340
341 static int pl2303_port_probe(struct usb_serial_port *port)
342 {
343 struct pl2303_private *priv;
344
345 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
346 if (!priv)
347 return -ENOMEM;
348
349 spin_lock_init(&priv->lock);
350
351 usb_set_serial_port_data(port, priv);
352
353 port->port.drain_delay = 256;
354
355 return 0;
356 }
357
358 static int pl2303_port_remove(struct usb_serial_port *port)
359 {
360 struct pl2303_private *priv = usb_get_serial_port_data(port);
361
362 kfree(priv);
363
364 return 0;
365 }
366
367 static int pl2303_set_control_lines(struct usb_serial_port *port, u8 value)
368 {
369 struct usb_device *dev = port->serial->dev;
370 int retval;
371
372 dev_dbg(&port->dev, "%s - %02x\n", __func__, value);
373
374 retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
375 SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
376 value, 0, NULL, 0, 100);
377 if (retval)
378 dev_err(&port->dev, "%s - failed: %d\n", __func__, retval);
379
380 return retval;
381 }
382
383 /*
384 * Returns the nearest supported baud rate that can be set directly without
385 * using divisors.
386 */
387 static speed_t pl2303_get_supported_baud_rate(speed_t baud)
388 {
389 static const speed_t baud_sup[] = {
390 75, 150, 300, 600, 1200, 1800, 2400, 3600, 4800, 7200, 9600,
391 14400, 19200, 28800, 38400, 57600, 115200, 230400, 460800,
392 614400, 921600, 1228800, 2457600, 3000000, 6000000
393 };
394
395 unsigned i;
396
397 for (i = 0; i < ARRAY_SIZE(baud_sup); ++i) {
398 if (baud_sup[i] > baud)
399 break;
400 }
401
402 if (i == ARRAY_SIZE(baud_sup))
403 baud = baud_sup[i - 1];
404 else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1]))
405 baud = baud_sup[i - 1];
406 else
407 baud = baud_sup[i];
408
409 return baud;
410 }
411
412 /*
413 * NOTE: If unsupported baud rates are set directly, the PL2303 seems to
414 * use 9600 baud.
415 */
416 static speed_t pl2303_encode_baud_rate_direct(unsigned char buf[4],
417 speed_t baud)
418 {
419 put_unaligned_le32(baud, buf);
420
421 return baud;
422 }
423
424 static speed_t pl2303_encode_baud_rate_divisor(unsigned char buf[4],
425 speed_t baud)
426 {
427 unsigned int baseline, mantissa, exponent;
428
429 /*
430 * Apparently the formula is:
431 * baudrate = 12M * 32 / (mantissa * 4^exponent)
432 * where
433 * mantissa = buf[8:0]
434 * exponent = buf[11:9]
435 */
436 baseline = 12000000 * 32;
437 mantissa = baseline / baud;
438 if (mantissa == 0)
439 mantissa = 1; /* Avoid dividing by zero if baud > 32*12M. */
440 exponent = 0;
441 while (mantissa >= 512) {
442 if (exponent < 7) {
443 mantissa >>= 2; /* divide by 4 */
444 exponent++;
445 } else {
446 /* Exponent is maxed. Trim mantissa and leave. */
447 mantissa = 511;
448 break;
449 }
450 }
451
452 buf[3] = 0x80;
453 buf[2] = 0;
454 buf[1] = exponent << 1 | mantissa >> 8;
455 buf[0] = mantissa & 0xff;
456
457 /* Calculate and return the exact baud rate. */
458 baud = (baseline / mantissa) >> (exponent << 1);
459
460 return baud;
461 }
462
463 static void pl2303_encode_baud_rate(struct tty_struct *tty,
464 struct usb_serial_port *port,
465 u8 buf[4])
466 {
467 struct usb_serial *serial = port->serial;
468 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
469 speed_t baud_sup;
470 speed_t baud;
471
472 baud = tty_get_baud_rate(tty);
473 dev_dbg(&port->dev, "baud requested = %u\n", baud);
474 if (!baud)
475 return;
476
477 if (spriv->type->max_baud_rate)
478 baud = min_t(speed_t, baud, spriv->type->max_baud_rate);
479 /*
480 * Use direct method for supported baud rates, otherwise use divisors.
481 */
482 baud_sup = pl2303_get_supported_baud_rate(baud);
483
484 if (baud == baud_sup)
485 baud = pl2303_encode_baud_rate_direct(buf, baud);
486 else
487 baud = pl2303_encode_baud_rate_divisor(buf, baud);
488
489 /* Save resulting baud rate */
490 tty_encode_baud_rate(tty, baud, baud);
491 dev_dbg(&port->dev, "baud set = %u\n", baud);
492 }
493
494 static int pl2303_get_line_request(struct usb_serial_port *port,
495 unsigned char buf[7])
496 {
497 struct usb_device *udev = port->serial->dev;
498 int ret;
499
500 ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
501 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
502 0, 0, buf, 7, 100);
503 if (ret != 7) {
504 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
505
506 if (ret >= 0)
507 ret = -EIO;
508
509 return ret;
510 }
511
512 dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
513
514 return 0;
515 }
516
517 static int pl2303_set_line_request(struct usb_serial_port *port,
518 unsigned char buf[7])
519 {
520 struct usb_device *udev = port->serial->dev;
521 int ret;
522
523 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
524 SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
525 0, 0, buf, 7, 100);
526 if (ret < 0) {
527 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
528 return ret;
529 }
530
531 dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
532
533 return 0;
534 }
535
536 static void pl2303_set_termios(struct tty_struct *tty,
537 struct usb_serial_port *port, struct ktermios *old_termios)
538 {
539 struct usb_serial *serial = port->serial;
540 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
541 struct pl2303_private *priv = usb_get_serial_port_data(port);
542 unsigned long flags;
543 unsigned char *buf;
544 int ret;
545 u8 control;
546
547 if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios))
548 return;
549
550 buf = kzalloc(7, GFP_KERNEL);
551 if (!buf) {
552 /* Report back no change occurred */
553 if (old_termios)
554 tty->termios = *old_termios;
555 return;
556 }
557
558 pl2303_get_line_request(port, buf);
559
560 switch (C_CSIZE(tty)) {
561 case CS5:
562 buf[6] = 5;
563 break;
564 case CS6:
565 buf[6] = 6;
566 break;
567 case CS7:
568 buf[6] = 7;
569 break;
570 default:
571 case CS8:
572 buf[6] = 8;
573 }
574 dev_dbg(&port->dev, "data bits = %d\n", buf[6]);
575
576 /* For reference buf[0]:buf[3] baud rate value */
577 pl2303_encode_baud_rate(tty, port, &buf[0]);
578
579 /* For reference buf[4]=0 is 1 stop bits */
580 /* For reference buf[4]=1 is 1.5 stop bits */
581 /* For reference buf[4]=2 is 2 stop bits */
582 if (C_CSTOPB(tty)) {
583 /*
584 * NOTE: Comply with "real" UARTs / RS232:
585 * use 1.5 instead of 2 stop bits with 5 data bits
586 */
587 if (C_CSIZE(tty) == CS5) {
588 buf[4] = 1;
589 dev_dbg(&port->dev, "stop bits = 1.5\n");
590 } else {
591 buf[4] = 2;
592 dev_dbg(&port->dev, "stop bits = 2\n");
593 }
594 } else {
595 buf[4] = 0;
596 dev_dbg(&port->dev, "stop bits = 1\n");
597 }
598
599 if (C_PARENB(tty)) {
600 /* For reference buf[5]=0 is none parity */
601 /* For reference buf[5]=1 is odd parity */
602 /* For reference buf[5]=2 is even parity */
603 /* For reference buf[5]=3 is mark parity */
604 /* For reference buf[5]=4 is space parity */
605 if (C_PARODD(tty)) {
606 if (C_CMSPAR(tty)) {
607 buf[5] = 3;
608 dev_dbg(&port->dev, "parity = mark\n");
609 } else {
610 buf[5] = 1;
611 dev_dbg(&port->dev, "parity = odd\n");
612 }
613 } else {
614 if (C_CMSPAR(tty)) {
615 buf[5] = 4;
616 dev_dbg(&port->dev, "parity = space\n");
617 } else {
618 buf[5] = 2;
619 dev_dbg(&port->dev, "parity = even\n");
620 }
621 }
622 } else {
623 buf[5] = 0;
624 dev_dbg(&port->dev, "parity = none\n");
625 }
626
627 /*
628 * Some PL2303 are known to lose bytes if you change serial settings
629 * even to the same values as before. Thus we actually need to filter
630 * in this specific case.
631 *
632 * Note that the tty_termios_hw_change check above is not sufficient
633 * as a previously requested baud rate may differ from the one
634 * actually used (and stored in old_termios).
635 *
636 * NOTE: No additional locking needed for line_settings as it is
637 * only used in set_termios, which is serialised against itself.
638 */
639 if (!old_termios || memcmp(buf, priv->line_settings, 7)) {
640 ret = pl2303_set_line_request(port, buf);
641 if (!ret)
642 memcpy(priv->line_settings, buf, 7);
643 }
644
645 /* change control lines if we are switching to or from B0 */
646 spin_lock_irqsave(&priv->lock, flags);
647 control = priv->line_control;
648 if (C_BAUD(tty) == B0)
649 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
650 else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
651 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
652 if (control != priv->line_control) {
653 control = priv->line_control;
654 spin_unlock_irqrestore(&priv->lock, flags);
655 pl2303_set_control_lines(port, control);
656 } else {
657 spin_unlock_irqrestore(&priv->lock, flags);
658 }
659
660 if (C_CRTSCTS(tty)) {
661 if (spriv->quirks & PL2303_QUIRK_LEGACY)
662 pl2303_vendor_write(serial, 0x0, 0x41);
663 else
664 pl2303_vendor_write(serial, 0x0, 0x61);
665 } else {
666 pl2303_vendor_write(serial, 0x0, 0x0);
667 }
668
669 kfree(buf);
670 }
671
672 static void pl2303_dtr_rts(struct usb_serial_port *port, int on)
673 {
674 struct pl2303_private *priv = usb_get_serial_port_data(port);
675 unsigned long flags;
676 u8 control;
677
678 spin_lock_irqsave(&priv->lock, flags);
679 if (on)
680 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
681 else
682 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
683 control = priv->line_control;
684 spin_unlock_irqrestore(&priv->lock, flags);
685
686 pl2303_set_control_lines(port, control);
687 }
688
689 static void pl2303_close(struct usb_serial_port *port)
690 {
691 usb_serial_generic_close(port);
692 usb_kill_urb(port->interrupt_in_urb);
693 pl2303_set_break(port, false);
694 }
695
696 static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port)
697 {
698 struct usb_serial *serial = port->serial;
699 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
700 int result;
701
702 if (spriv->quirks & PL2303_QUIRK_LEGACY) {
703 usb_clear_halt(serial->dev, port->write_urb->pipe);
704 usb_clear_halt(serial->dev, port->read_urb->pipe);
705 } else {
706 /* reset upstream data pipes */
707 pl2303_vendor_write(serial, 8, 0);
708 pl2303_vendor_write(serial, 9, 0);
709 }
710
711 /* Setup termios */
712 if (tty)
713 pl2303_set_termios(tty, port, NULL);
714
715 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
716 if (result) {
717 dev_err(&port->dev, "failed to submit interrupt urb: %d\n",
718 result);
719 return result;
720 }
721
722 result = usb_serial_generic_open(tty, port);
723 if (result) {
724 usb_kill_urb(port->interrupt_in_urb);
725 return result;
726 }
727
728 return 0;
729 }
730
731 static int pl2303_tiocmset(struct tty_struct *tty,
732 unsigned int set, unsigned int clear)
733 {
734 struct usb_serial_port *port = tty->driver_data;
735 struct pl2303_private *priv = usb_get_serial_port_data(port);
736 unsigned long flags;
737 u8 control;
738 int ret;
739
740 spin_lock_irqsave(&priv->lock, flags);
741 if (set & TIOCM_RTS)
742 priv->line_control |= CONTROL_RTS;
743 if (set & TIOCM_DTR)
744 priv->line_control |= CONTROL_DTR;
745 if (clear & TIOCM_RTS)
746 priv->line_control &= ~CONTROL_RTS;
747 if (clear & TIOCM_DTR)
748 priv->line_control &= ~CONTROL_DTR;
749 control = priv->line_control;
750 spin_unlock_irqrestore(&priv->lock, flags);
751
752 ret = pl2303_set_control_lines(port, control);
753 if (ret)
754 return usb_translate_errors(ret);
755
756 return 0;
757 }
758
759 static int pl2303_tiocmget(struct tty_struct *tty)
760 {
761 struct usb_serial_port *port = tty->driver_data;
762 struct pl2303_private *priv = usb_get_serial_port_data(port);
763 unsigned long flags;
764 unsigned int mcr;
765 unsigned int status;
766 unsigned int result;
767
768 spin_lock_irqsave(&priv->lock, flags);
769 mcr = priv->line_control;
770 status = priv->line_status;
771 spin_unlock_irqrestore(&priv->lock, flags);
772
773 result = ((mcr & CONTROL_DTR) ? TIOCM_DTR : 0)
774 | ((mcr & CONTROL_RTS) ? TIOCM_RTS : 0)
775 | ((status & UART_CTS) ? TIOCM_CTS : 0)
776 | ((status & UART_DSR) ? TIOCM_DSR : 0)
777 | ((status & UART_RING) ? TIOCM_RI : 0)
778 | ((status & UART_DCD) ? TIOCM_CD : 0);
779
780 dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
781
782 return result;
783 }
784
785 static int pl2303_carrier_raised(struct usb_serial_port *port)
786 {
787 struct pl2303_private *priv = usb_get_serial_port_data(port);
788
789 if (priv->line_status & UART_DCD)
790 return 1;
791
792 return 0;
793 }
794
795 static int pl2303_ioctl(struct tty_struct *tty,
796 unsigned int cmd, unsigned long arg)
797 {
798 struct serial_struct ser;
799 struct usb_serial_port *port = tty->driver_data;
800
801 switch (cmd) {
802 case TIOCGSERIAL:
803 memset(&ser, 0, sizeof ser);
804 ser.type = PORT_16654;
805 ser.line = port->minor;
806 ser.port = port->port_number;
807 ser.baud_base = 460800;
808
809 if (copy_to_user((void __user *)arg, &ser, sizeof ser))
810 return -EFAULT;
811
812 return 0;
813 default:
814 break;
815 }
816
817 return -ENOIOCTLCMD;
818 }
819
820 static void pl2303_set_break(struct usb_serial_port *port, bool enable)
821 {
822 struct usb_serial *serial = port->serial;
823 u16 state;
824 int result;
825
826 if (enable)
827 state = BREAK_ON;
828 else
829 state = BREAK_OFF;
830
831 dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
832 state == BREAK_OFF ? "off" : "on");
833
834 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
835 BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
836 0, NULL, 0, 100);
837 if (result)
838 dev_err(&port->dev, "error sending break = %d\n", result);
839 }
840
841 static void pl2303_break_ctl(struct tty_struct *tty, int state)
842 {
843 struct usb_serial_port *port = tty->driver_data;
844
845 pl2303_set_break(port, state);
846 }
847
848 static void pl2303_update_line_status(struct usb_serial_port *port,
849 unsigned char *data,
850 unsigned int actual_length)
851 {
852 struct usb_serial *serial = port->serial;
853 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
854 struct pl2303_private *priv = usb_get_serial_port_data(port);
855 struct tty_struct *tty;
856 unsigned long flags;
857 unsigned int status_idx = UART_STATE_INDEX;
858 u8 status;
859 u8 delta;
860
861 if (spriv->quirks & PL2303_QUIRK_UART_STATE_IDX0)
862 status_idx = 0;
863
864 if (actual_length < status_idx + 1)
865 return;
866
867 status = data[status_idx];
868
869 /* Save off the uart status for others to look at */
870 spin_lock_irqsave(&priv->lock, flags);
871 delta = priv->line_status ^ status;
872 priv->line_status = status;
873 spin_unlock_irqrestore(&priv->lock, flags);
874
875 if (status & UART_BREAK_ERROR)
876 usb_serial_handle_break(port);
877
878 if (delta & UART_STATE_MSR_MASK) {
879 if (delta & UART_CTS)
880 port->icount.cts++;
881 if (delta & UART_DSR)
882 port->icount.dsr++;
883 if (delta & UART_RING)
884 port->icount.rng++;
885 if (delta & UART_DCD) {
886 port->icount.dcd++;
887 tty = tty_port_tty_get(&port->port);
888 if (tty) {
889 usb_serial_handle_dcd_change(port, tty,
890 status & UART_DCD);
891 tty_kref_put(tty);
892 }
893 }
894
895 wake_up_interruptible(&port->port.delta_msr_wait);
896 }
897 }
898
899 static void pl2303_read_int_callback(struct urb *urb)
900 {
901 struct usb_serial_port *port = urb->context;
902 unsigned char *data = urb->transfer_buffer;
903 unsigned int actual_length = urb->actual_length;
904 int status = urb->status;
905 int retval;
906
907 switch (status) {
908 case 0:
909 /* success */
910 break;
911 case -ECONNRESET:
912 case -ENOENT:
913 case -ESHUTDOWN:
914 /* this urb is terminated, clean up */
915 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
916 __func__, status);
917 return;
918 default:
919 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
920 __func__, status);
921 goto exit;
922 }
923
924 usb_serial_debug_data(&port->dev, __func__,
925 urb->actual_length, urb->transfer_buffer);
926
927 pl2303_update_line_status(port, data, actual_length);
928
929 exit:
930 retval = usb_submit_urb(urb, GFP_ATOMIC);
931 if (retval) {
932 dev_err(&port->dev,
933 "%s - usb_submit_urb failed with result %d\n",
934 __func__, retval);
935 }
936 }
937
938 static void pl2303_process_read_urb(struct urb *urb)
939 {
940 struct usb_serial_port *port = urb->context;
941 struct pl2303_private *priv = usb_get_serial_port_data(port);
942 unsigned char *data = urb->transfer_buffer;
943 char tty_flag = TTY_NORMAL;
944 unsigned long flags;
945 u8 line_status;
946 int i;
947
948 /* update line status */
949 spin_lock_irqsave(&priv->lock, flags);
950 line_status = priv->line_status;
951 priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
952 spin_unlock_irqrestore(&priv->lock, flags);
953
954 if (!urb->actual_length)
955 return;
956
957 /*
958 * Break takes precedence over parity, which takes precedence over
959 * framing errors.
960 */
961 if (line_status & UART_BREAK_ERROR)
962 tty_flag = TTY_BREAK;
963 else if (line_status & UART_PARITY_ERROR)
964 tty_flag = TTY_PARITY;
965 else if (line_status & UART_FRAME_ERROR)
966 tty_flag = TTY_FRAME;
967
968 if (tty_flag != TTY_NORMAL)
969 dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__,
970 tty_flag);
971 /* overrun is special, not associated with a char */
972 if (line_status & UART_OVERRUN_ERROR)
973 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
974
975 if (port->port.console && port->sysrq) {
976 for (i = 0; i < urb->actual_length; ++i)
977 if (!usb_serial_handle_sysrq_char(port, data[i]))
978 tty_insert_flip_char(&port->port, data[i],
979 tty_flag);
980 } else {
981 tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag,
982 urb->actual_length);
983 }
984
985 tty_flip_buffer_push(&port->port);
986 }
987
988 static struct usb_serial_driver pl2303_device = {
989 .driver = {
990 .owner = THIS_MODULE,
991 .name = "pl2303",
992 },
993 .id_table = id_table,
994 .num_bulk_in = 1,
995 .num_bulk_out = 1,
996 .num_interrupt_in = 0, /* see pl2303_calc_num_ports */
997 .bulk_in_size = 256,
998 .bulk_out_size = 256,
999 .open = pl2303_open,
1000 .close = pl2303_close,
1001 .dtr_rts = pl2303_dtr_rts,
1002 .carrier_raised = pl2303_carrier_raised,
1003 .ioctl = pl2303_ioctl,
1004 .break_ctl = pl2303_break_ctl,
1005 .set_termios = pl2303_set_termios,
1006 .tiocmget = pl2303_tiocmget,
1007 .tiocmset = pl2303_tiocmset,
1008 .tiocmiwait = usb_serial_generic_tiocmiwait,
1009 .process_read_urb = pl2303_process_read_urb,
1010 .read_int_callback = pl2303_read_int_callback,
1011 .probe = pl2303_probe,
1012 .calc_num_ports = pl2303_calc_num_ports,
1013 .attach = pl2303_startup,
1014 .release = pl2303_release,
1015 .port_probe = pl2303_port_probe,
1016 .port_remove = pl2303_port_remove,
1017 };
1018
1019 static struct usb_serial_driver * const serial_drivers[] = {
1020 &pl2303_device, NULL
1021 };
1022
1023 module_usb_serial_driver(serial_drivers, id_table);
1024
1025 MODULE_DESCRIPTION("Prolific PL2303 USB to serial adaptor driver");
1026 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support