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 ([email protected])
6 * Copyright (C) 2003 IBM Corp.
7 *
8 * Original driver for 2.2.x by anonymous
9 *
10 * See Documentation/usb/usb-serial.rst 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 <linux/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 #define PL2303_QUIRK_NO_BREAK_GETLINE BIT(3)
35
36 static const struct usb_device_id id_table[] = {
37 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID),
38 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
39 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) },
40 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_DCU11) },
41 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ3) },
42 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_CHILITAG) },
43 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_PHAROS) },
44 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ALDIGA) },
45 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MMX) },
46 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GPRS) },
47 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_HCR331) },
48 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MOTOROLA) },
49 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ZTEK) },
50 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_TB) },
51 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GC) },
52 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GB) },
53 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GT) },
54 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GL) },
55 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GE) },
56 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GS) },
57 { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
58 { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID_RSAQ5) },
59 { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID),
60 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
61 { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_UC485),
62 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
63 { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_UC232B),
64 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
65 { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID2) },
66 { USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) },
67 { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },
68 { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) },
69 { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) },
70 { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID_2080) },
71 { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) },
72 { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) },
73 { USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) },
74 { USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) },
75 { USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) },
76 { USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) },
77 { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) },
78 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1),
79 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
80 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65),
81 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
82 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75),
83 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
84 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_EF81),
85 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
86 { USB_DEVICE(BENQ_VENDOR_ID, BENQ_PRODUCT_ID_S81) }, /* Benq/Siemens S81 */
87 { USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) },
88 { USB_DEVICE(NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID) },
89 { USB_DEVICE(CA_42_CA42_VENDOR_ID, CA_42_CA42_PRODUCT_ID) },
90 { USB_DEVICE(SAGEM_VENDOR_ID, SAGEM_PRODUCT_ID) },
91 { USB_DEVICE(LEADTEK_VENDOR_ID, LEADTEK_9531_PRODUCT_ID) },
92 { USB_DEVICE(SPEEDDRAGON_VENDOR_ID, SPEEDDRAGON_PRODUCT_ID) },
93 { USB_DEVICE(DATAPILOT_U2_VENDOR_ID, DATAPILOT_U2_PRODUCT_ID) },
94 { USB_DEVICE(BELKIN_VENDOR_ID, BELKIN_PRODUCT_ID) },
95 { USB_DEVICE(ALCOR_VENDOR_ID, ALCOR_PRODUCT_ID),
96 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
97 { USB_DEVICE(WS002IN_VENDOR_ID, WS002IN_PRODUCT_ID) },
98 { USB_DEVICE(COREGA_VENDOR_ID, COREGA_PRODUCT_ID) },
99 { USB_DEVICE(YCCABLE_VENDOR_ID, YCCABLE_PRODUCT_ID) },
100 { USB_DEVICE(SUPERIAL_VENDOR_ID, SUPERIAL_PRODUCT_ID) },
101 { USB_DEVICE(HP_VENDOR_ID, HP_LD220_PRODUCT_ID) },
102 { USB_DEVICE(HP_VENDOR_ID, HP_LD220TA_PRODUCT_ID) },
103 { USB_DEVICE(HP_VENDOR_ID, HP_LD381_PRODUCT_ID) },
104 { USB_DEVICE(HP_VENDOR_ID, HP_LD381GC_PRODUCT_ID) },
105 { USB_DEVICE(HP_VENDOR_ID, HP_LD960_PRODUCT_ID) },
106 { USB_DEVICE(HP_VENDOR_ID, HP_LD960TA_PRODUCT_ID) },
107 { USB_DEVICE(HP_VENDOR_ID, HP_LCM220_PRODUCT_ID) },
108 { USB_DEVICE(HP_VENDOR_ID, HP_LCM960_PRODUCT_ID) },
109 { USB_DEVICE(HP_VENDOR_ID, HP_LM920_PRODUCT_ID) },
110 { USB_DEVICE(HP_VENDOR_ID, HP_LM930_PRODUCT_ID) },
111 { USB_DEVICE(HP_VENDOR_ID, HP_LM940_PRODUCT_ID) },
112 { USB_DEVICE(HP_VENDOR_ID, HP_TD620_PRODUCT_ID) },
113 { USB_DEVICE(CRESSI_VENDOR_ID, CRESSI_EDY_PRODUCT_ID) },
114 { USB_DEVICE(ZEAGLE_VENDOR_ID, ZEAGLE_N2ITION3_PRODUCT_ID) },
115 { USB_DEVICE(SONY_VENDOR_ID, SONY_QN3USB_PRODUCT_ID) },
116 { USB_DEVICE(SANWA_VENDOR_ID, SANWA_PRODUCT_ID) },
117 { USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530_PRODUCT_ID) },
118 { USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530GC_PRODUCT_ID) },
119 { USB_DEVICE(SMART_VENDOR_ID, SMART_PRODUCT_ID) },
120 { USB_DEVICE(AT_VENDOR_ID, AT_VTKIT3_PRODUCT_ID) },
121 { USB_DEVICE(IBM_VENDOR_ID, IBM_PRODUCT_ID) },
122 { USB_DEVICE(MACROSILICON_VENDOR_ID, MACROSILICON_MS3020_PRODUCT_ID) },
123 { } /* Terminating entry */
124 };
125
126 MODULE_DEVICE_TABLE(usb, id_table);
127
128 #define SET_LINE_REQUEST_TYPE 0x21
129 #define SET_LINE_REQUEST 0x20
130
131 #define SET_CONTROL_REQUEST_TYPE 0x21
132 #define SET_CONTROL_REQUEST 0x22
133 #define CONTROL_DTR 0x01
134 #define CONTROL_RTS 0x02
135
136 #define BREAK_REQUEST_TYPE 0x21
137 #define BREAK_REQUEST 0x23
138 #define BREAK_ON 0xffff
139 #define BREAK_OFF 0x0000
140
141 #define GET_LINE_REQUEST_TYPE 0xa1
142 #define GET_LINE_REQUEST 0x21
143
144 #define VENDOR_WRITE_REQUEST_TYPE 0x40
145 #define VENDOR_WRITE_REQUEST 0x01
146 #define VENDOR_WRITE_NREQUEST 0x80
147
148 #define VENDOR_READ_REQUEST_TYPE 0xc0
149 #define VENDOR_READ_REQUEST 0x01
150 #define VENDOR_READ_NREQUEST 0x81
151
152 #define UART_STATE_INDEX 8
153 #define UART_STATE_MSR_MASK 0x8b
154 #define UART_STATE_TRANSIENT_MASK 0x74
155 #define UART_DCD 0x01
156 #define UART_DSR 0x02
157 #define UART_BREAK_ERROR 0x04
158 #define UART_RING 0x08
159 #define UART_FRAME_ERROR 0x10
160 #define UART_PARITY_ERROR 0x20
161 #define UART_OVERRUN_ERROR 0x40
162 #define UART_CTS 0x80
163
164 #define PL2303_FLOWCTRL_MASK 0xf0
165
166 #define PL2303_READ_TYPE_HX_STATUS 0x8080
167
168 #define PL2303_HXN_RESET_REG 0x07
169 #define PL2303_HXN_RESET_UPSTREAM_PIPE 0x02
170 #define PL2303_HXN_RESET_DOWNSTREAM_PIPE 0x01
171
172 #define PL2303_HXN_FLOWCTRL_REG 0x0a
173 #define PL2303_HXN_FLOWCTRL_MASK 0x1c
174 #define PL2303_HXN_FLOWCTRL_NONE 0x1c
175 #define PL2303_HXN_FLOWCTRL_RTS_CTS 0x18
176 #define PL2303_HXN_FLOWCTRL_XON_XOFF 0x0c
177
178 static int pl2303_set_break(struct usb_serial_port *port, bool enable);
179
180 enum pl2303_type {
181 TYPE_H,
182 TYPE_HX,
183 TYPE_TA,
184 TYPE_TB,
185 TYPE_HXD,
186 TYPE_HXN,
187 TYPE_COUNT
188 };
189
190 struct pl2303_type_data {
191 const char *name;
192 speed_t max_baud_rate;
193 unsigned long quirks;
194 unsigned int no_autoxonxoff:1;
195 unsigned int no_divisors:1;
196 unsigned int alt_divisors:1;
197 };
198
199 struct pl2303_serial_private {
200 const struct pl2303_type_data *type;
201 unsigned long quirks;
202 };
203
204 struct pl2303_private {
205 spinlock_t lock;
206 u8 line_control;
207 u8 line_status;
208
209 u8 line_settings[7];
210 };
211
212 static const struct pl2303_type_data pl2303_type_data[TYPE_COUNT] = {
213 [TYPE_H] = {
214 .name = "H",
215 .max_baud_rate = 1228800,
216 .quirks = PL2303_QUIRK_LEGACY,
217 .no_autoxonxoff = true,
218 },
219 [TYPE_HX] = {
220 .name = "HX",
221 .max_baud_rate = 6000000,
222 },
223 [TYPE_TA] = {
224 .name = "TA",
225 .max_baud_rate = 6000000,
226 .alt_divisors = true,
227 },
228 [TYPE_TB] = {
229 .name = "TB",
230 .max_baud_rate = 12000000,
231 .alt_divisors = true,
232 },
233 [TYPE_HXD] = {
234 .name = "HXD",
235 .max_baud_rate = 12000000,
236 },
237 [TYPE_HXN] = {
238 .name = "G",
239 .max_baud_rate = 12000000,
240 .no_divisors = true,
241 },
242 };
243
pl2303_vendor_read(struct usb_serial * serial,u16 value,unsigned char buf[1])244 static int pl2303_vendor_read(struct usb_serial *serial, u16 value,
245 unsigned char buf[1])
246 {
247 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
248 struct device *dev = &serial->interface->dev;
249 u8 request;
250 int res;
251
252 if (spriv->type == &pl2303_type_data[TYPE_HXN])
253 request = VENDOR_READ_NREQUEST;
254 else
255 request = VENDOR_READ_REQUEST;
256
257 res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
258 request, VENDOR_READ_REQUEST_TYPE,
259 value, 0, buf, 1, 100);
260 if (res != 1) {
261 dev_err(dev, "%s - failed to read [%04x]: %d\n", __func__,
262 value, res);
263 if (res >= 0)
264 res = -EIO;
265
266 return res;
267 }
268
269 dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, buf[0]);
270
271 return 0;
272 }
273
pl2303_vendor_write(struct usb_serial * serial,u16 value,u16 index)274 static int pl2303_vendor_write(struct usb_serial *serial, u16 value, u16 index)
275 {
276 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
277 struct device *dev = &serial->interface->dev;
278 u8 request;
279 int res;
280
281 dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, index);
282
283 if (spriv->type == &pl2303_type_data[TYPE_HXN])
284 request = VENDOR_WRITE_NREQUEST;
285 else
286 request = VENDOR_WRITE_REQUEST;
287
288 res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
289 request, VENDOR_WRITE_REQUEST_TYPE,
290 value, index, NULL, 0, 100);
291 if (res) {
292 dev_err(dev, "%s - failed to write [%04x]: %d\n", __func__,
293 value, res);
294 return res;
295 }
296
297 return 0;
298 }
299
pl2303_update_reg(struct usb_serial * serial,u8 reg,u8 mask,u8 val)300 static int pl2303_update_reg(struct usb_serial *serial, u8 reg, u8 mask, u8 val)
301 {
302 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
303 int ret = 0;
304 u8 *buf;
305
306 buf = kmalloc(1, GFP_KERNEL);
307 if (!buf)
308 return -ENOMEM;
309
310 if (spriv->type == &pl2303_type_data[TYPE_HXN])
311 ret = pl2303_vendor_read(serial, reg, buf);
312 else
313 ret = pl2303_vendor_read(serial, reg | 0x80, buf);
314
315 if (ret)
316 goto out_free;
317
318 *buf &= ~mask;
319 *buf |= val & mask;
320
321 ret = pl2303_vendor_write(serial, reg, *buf);
322 out_free:
323 kfree(buf);
324
325 return ret;
326 }
327
pl2303_probe(struct usb_serial * serial,const struct usb_device_id * id)328 static int pl2303_probe(struct usb_serial *serial,
329 const struct usb_device_id *id)
330 {
331 usb_set_serial_data(serial, (void *)id->driver_info);
332
333 return 0;
334 }
335
336 /*
337 * Use interrupt endpoint from first interface if available.
338 *
339 * This is needed due to the looney way its endpoints are set up.
340 */
pl2303_endpoint_hack(struct usb_serial * serial,struct usb_serial_endpoints * epds)341 static int pl2303_endpoint_hack(struct usb_serial *serial,
342 struct usb_serial_endpoints *epds)
343 {
344 struct usb_interface *interface = serial->interface;
345 struct usb_device *dev = serial->dev;
346 struct device *ddev = &interface->dev;
347 struct usb_host_interface *iface_desc;
348 struct usb_endpoint_descriptor *endpoint;
349 unsigned int i;
350
351 if (interface == dev->actconfig->interface[0])
352 return 0;
353
354 /* check out the endpoints of the other interface */
355 iface_desc = dev->actconfig->interface[0]->cur_altsetting;
356
357 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
358 endpoint = &iface_desc->endpoint[i].desc;
359
360 if (!usb_endpoint_is_int_in(endpoint))
361 continue;
362
363 dev_dbg(ddev, "found interrupt in on separate interface\n");
364 if (epds->num_interrupt_in < ARRAY_SIZE(epds->interrupt_in))
365 epds->interrupt_in[epds->num_interrupt_in++] = endpoint;
366 }
367
368 return 0;
369 }
370
pl2303_calc_num_ports(struct usb_serial * serial,struct usb_serial_endpoints * epds)371 static int pl2303_calc_num_ports(struct usb_serial *serial,
372 struct usb_serial_endpoints *epds)
373 {
374 unsigned long quirks = (unsigned long)usb_get_serial_data(serial);
375 struct device *dev = &serial->interface->dev;
376 int ret;
377
378 if (quirks & PL2303_QUIRK_ENDPOINT_HACK) {
379 ret = pl2303_endpoint_hack(serial, epds);
380 if (ret)
381 return ret;
382 }
383
384 if (epds->num_interrupt_in < 1) {
385 dev_err(dev, "required interrupt-in endpoint missing\n");
386 return -ENODEV;
387 }
388
389 return 1;
390 }
391
pl2303_supports_hx_status(struct usb_serial * serial)392 static bool pl2303_supports_hx_status(struct usb_serial *serial)
393 {
394 int ret;
395 u8 buf;
396
397 ret = usb_control_msg_recv(serial->dev, 0, VENDOR_READ_REQUEST,
398 VENDOR_READ_REQUEST_TYPE, PL2303_READ_TYPE_HX_STATUS,
399 0, &buf, 1, 100, GFP_KERNEL);
400
401 return ret == 0;
402 }
403
pl2303_detect_type(struct usb_serial * serial)404 static int pl2303_detect_type(struct usb_serial *serial)
405 {
406 struct usb_device_descriptor *desc = &serial->dev->descriptor;
407 u16 bcdDevice, bcdUSB;
408
409 /*
410 * Legacy PL2303H, variants 0 and 1 (difference unknown).
411 */
412 if (desc->bDeviceClass == 0x02)
413 return TYPE_H; /* variant 0 */
414
415 if (desc->bMaxPacketSize0 != 0x40) {
416 if (desc->bDeviceClass == 0x00 || desc->bDeviceClass == 0xff)
417 return TYPE_H; /* variant 1 */
418
419 return TYPE_H; /* variant 0 */
420 }
421
422 bcdDevice = le16_to_cpu(desc->bcdDevice);
423 bcdUSB = le16_to_cpu(desc->bcdUSB);
424
425 switch (bcdUSB) {
426 case 0x101:
427 /* USB 1.0.1? Let's assume they meant 1.1... */
428 fallthrough;
429 case 0x110:
430 switch (bcdDevice) {
431 case 0x300:
432 return TYPE_HX;
433 case 0x400:
434 return TYPE_HXD;
435 default:
436 return TYPE_HX;
437 }
438 break;
439 case 0x200:
440 switch (bcdDevice) {
441 case 0x100: /* GC */
442 case 0x105:
443 return TYPE_HXN;
444 case 0x300: /* GT / TA */
445 if (pl2303_supports_hx_status(serial))
446 return TYPE_TA;
447 fallthrough;
448 case 0x305:
449 case 0x400: /* GL */
450 case 0x405:
451 return TYPE_HXN;
452 case 0x500: /* GE / TB */
453 if (pl2303_supports_hx_status(serial))
454 return TYPE_TB;
455 fallthrough;
456 case 0x505:
457 case 0x600: /* GS */
458 case 0x605:
459 case 0x700: /* GR */
460 case 0x705:
461 return TYPE_HXN;
462 }
463 break;
464 }
465
466 dev_err(&serial->interface->dev,
467 "unknown device type, please report to [email protected]\n");
468 return -ENODEV;
469 }
470
pl2303_is_hxd_clone(struct usb_serial * serial)471 static bool pl2303_is_hxd_clone(struct usb_serial *serial)
472 {
473 struct usb_device *udev = serial->dev;
474 unsigned char *buf;
475 int ret;
476
477 buf = kmalloc(7, GFP_KERNEL);
478 if (!buf)
479 return false;
480
481 ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
482 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
483 0, 0, buf, 7, 100);
484
485 kfree(buf);
486
487 return ret == -EPIPE;
488 }
489
pl2303_startup(struct usb_serial * serial)490 static int pl2303_startup(struct usb_serial *serial)
491 {
492 struct pl2303_serial_private *spriv;
493 enum pl2303_type type;
494 unsigned char *buf;
495 int ret;
496
497 ret = pl2303_detect_type(serial);
498 if (ret < 0)
499 return ret;
500
501 type = ret;
502 dev_dbg(&serial->interface->dev, "device type: %s\n", pl2303_type_data[type].name);
503
504 spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
505 if (!spriv)
506 return -ENOMEM;
507
508 spriv->type = &pl2303_type_data[type];
509 spriv->quirks = (unsigned long)usb_get_serial_data(serial);
510 spriv->quirks |= spriv->type->quirks;
511
512 if (type == TYPE_HXD && pl2303_is_hxd_clone(serial))
513 spriv->quirks |= PL2303_QUIRK_NO_BREAK_GETLINE;
514
515 usb_set_serial_data(serial, spriv);
516
517 if (type != TYPE_HXN) {
518 buf = kmalloc(1, GFP_KERNEL);
519 if (!buf) {
520 kfree(spriv);
521 return -ENOMEM;
522 }
523
524 pl2303_vendor_read(serial, 0x8484, buf);
525 pl2303_vendor_write(serial, 0x0404, 0);
526 pl2303_vendor_read(serial, 0x8484, buf);
527 pl2303_vendor_read(serial, 0x8383, buf);
528 pl2303_vendor_read(serial, 0x8484, buf);
529 pl2303_vendor_write(serial, 0x0404, 1);
530 pl2303_vendor_read(serial, 0x8484, buf);
531 pl2303_vendor_read(serial, 0x8383, buf);
532 pl2303_vendor_write(serial, 0, 1);
533 pl2303_vendor_write(serial, 1, 0);
534 if (spriv->quirks & PL2303_QUIRK_LEGACY)
535 pl2303_vendor_write(serial, 2, 0x24);
536 else
537 pl2303_vendor_write(serial, 2, 0x44);
538
539 kfree(buf);
540 }
541
542 return 0;
543 }
544
pl2303_release(struct usb_serial * serial)545 static void pl2303_release(struct usb_serial *serial)
546 {
547 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
548
549 kfree(spriv);
550 }
551
pl2303_port_probe(struct usb_serial_port * port)552 static int pl2303_port_probe(struct usb_serial_port *port)
553 {
554 struct pl2303_private *priv;
555
556 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
557 if (!priv)
558 return -ENOMEM;
559
560 spin_lock_init(&priv->lock);
561
562 usb_set_serial_port_data(port, priv);
563
564 port->port.drain_delay = 256;
565
566 return 0;
567 }
568
pl2303_port_remove(struct usb_serial_port * port)569 static void pl2303_port_remove(struct usb_serial_port *port)
570 {
571 struct pl2303_private *priv = usb_get_serial_port_data(port);
572
573 kfree(priv);
574 }
575
pl2303_set_control_lines(struct usb_serial_port * port,u8 value)576 static int pl2303_set_control_lines(struct usb_serial_port *port, u8 value)
577 {
578 struct usb_device *dev = port->serial->dev;
579 int retval;
580
581 dev_dbg(&port->dev, "%s - %02x\n", __func__, value);
582
583 retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
584 SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
585 value, 0, NULL, 0, 100);
586 if (retval)
587 dev_err(&port->dev, "%s - failed: %d\n", __func__, retval);
588
589 return retval;
590 }
591
592 /*
593 * Returns the nearest supported baud rate that can be set directly without
594 * using divisors.
595 */
pl2303_get_supported_baud_rate(speed_t baud)596 static speed_t pl2303_get_supported_baud_rate(speed_t baud)
597 {
598 static const speed_t baud_sup[] = {
599 75, 150, 300, 600, 1200, 1800, 2400, 3600, 4800, 7200, 9600,
600 14400, 19200, 28800, 38400, 57600, 115200, 230400, 460800,
601 614400, 921600, 1228800, 2457600, 3000000, 6000000
602 };
603
604 unsigned i;
605
606 for (i = 0; i < ARRAY_SIZE(baud_sup); ++i) {
607 if (baud_sup[i] > baud)
608 break;
609 }
610
611 if (i == ARRAY_SIZE(baud_sup))
612 baud = baud_sup[i - 1];
613 else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1]))
614 baud = baud_sup[i - 1];
615 else
616 baud = baud_sup[i];
617
618 return baud;
619 }
620
621 /*
622 * NOTE: If unsupported baud rates are set directly, the PL2303 seems to
623 * use 9600 baud.
624 */
pl2303_encode_baud_rate_direct(unsigned char buf[4],speed_t baud)625 static speed_t pl2303_encode_baud_rate_direct(unsigned char buf[4],
626 speed_t baud)
627 {
628 put_unaligned_le32(baud, buf);
629
630 return baud;
631 }
632
pl2303_encode_baud_rate_divisor(unsigned char buf[4],speed_t baud)633 static speed_t pl2303_encode_baud_rate_divisor(unsigned char buf[4],
634 speed_t baud)
635 {
636 unsigned int baseline, mantissa, exponent;
637
638 /*
639 * Apparently the formula is:
640 * baudrate = 12M * 32 / (mantissa * 4^exponent)
641 * where
642 * mantissa = buf[8:0]
643 * exponent = buf[11:9]
644 */
645 baseline = 12000000 * 32;
646 mantissa = baseline / baud;
647 if (mantissa == 0)
648 mantissa = 1; /* Avoid dividing by zero if baud > 32*12M. */
649 exponent = 0;
650 while (mantissa >= 512) {
651 if (exponent < 7) {
652 mantissa >>= 2; /* divide by 4 */
653 exponent++;
654 } else {
655 /* Exponent is maxed. Trim mantissa and leave. */
656 mantissa = 511;
657 break;
658 }
659 }
660
661 buf[3] = 0x80;
662 buf[2] = 0;
663 buf[1] = exponent << 1 | mantissa >> 8;
664 buf[0] = mantissa & 0xff;
665
666 /* Calculate and return the exact baud rate. */
667 baud = (baseline / mantissa) >> (exponent << 1);
668
669 return baud;
670 }
671
pl2303_encode_baud_rate_divisor_alt(unsigned char buf[4],speed_t baud)672 static speed_t pl2303_encode_baud_rate_divisor_alt(unsigned char buf[4],
673 speed_t baud)
674 {
675 unsigned int baseline, mantissa, exponent;
676
677 /*
678 * Apparently, for the TA version the formula is:
679 * baudrate = 12M * 32 / (mantissa * 2^exponent)
680 * where
681 * mantissa = buf[10:0]
682 * exponent = buf[15:13 16]
683 */
684 baseline = 12000000 * 32;
685 mantissa = baseline / baud;
686 if (mantissa == 0)
687 mantissa = 1; /* Avoid dividing by zero if baud > 32*12M. */
688 exponent = 0;
689 while (mantissa >= 2048) {
690 if (exponent < 15) {
691 mantissa >>= 1; /* divide by 2 */
692 exponent++;
693 } else {
694 /* Exponent is maxed. Trim mantissa and leave. */
695 mantissa = 2047;
696 break;
697 }
698 }
699
700 buf[3] = 0x80;
701 buf[2] = exponent & 0x01;
702 buf[1] = (exponent & ~0x01) << 4 | mantissa >> 8;
703 buf[0] = mantissa & 0xff;
704
705 /* Calculate and return the exact baud rate. */
706 baud = (baseline / mantissa) >> exponent;
707
708 return baud;
709 }
710
pl2303_encode_baud_rate(struct tty_struct * tty,struct usb_serial_port * port,u8 buf[4])711 static void pl2303_encode_baud_rate(struct tty_struct *tty,
712 struct usb_serial_port *port,
713 u8 buf[4])
714 {
715 struct usb_serial *serial = port->serial;
716 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
717 speed_t baud_sup;
718 speed_t baud;
719
720 baud = tty_get_baud_rate(tty);
721 dev_dbg(&port->dev, "baud requested = %u\n", baud);
722 if (!baud)
723 return;
724
725 if (spriv->type->max_baud_rate)
726 baud = min_t(speed_t, baud, spriv->type->max_baud_rate);
727 /*
728 * Use direct method for supported baud rates, otherwise use divisors.
729 * Newer chip types do not support divisor encoding.
730 */
731 if (spriv->type->no_divisors)
732 baud_sup = baud;
733 else
734 baud_sup = pl2303_get_supported_baud_rate(baud);
735
736 if (baud == baud_sup)
737 baud = pl2303_encode_baud_rate_direct(buf, baud);
738 else if (spriv->type->alt_divisors)
739 baud = pl2303_encode_baud_rate_divisor_alt(buf, baud);
740 else
741 baud = pl2303_encode_baud_rate_divisor(buf, baud);
742
743 /* Save resulting baud rate */
744 tty_encode_baud_rate(tty, baud, baud);
745 dev_dbg(&port->dev, "baud set = %u\n", baud);
746 }
747
pl2303_get_line_request(struct usb_serial_port * port,unsigned char buf[7])748 static int pl2303_get_line_request(struct usb_serial_port *port,
749 unsigned char buf[7])
750 {
751 struct usb_serial *serial = port->serial;
752 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
753 struct usb_device *udev = serial->dev;
754 int ret;
755
756 if (spriv->quirks & PL2303_QUIRK_NO_BREAK_GETLINE) {
757 struct pl2303_private *priv = usb_get_serial_port_data(port);
758
759 memcpy(buf, priv->line_settings, 7);
760 return 0;
761 }
762
763 ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
764 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
765 0, 0, buf, 7, 100);
766 if (ret != 7) {
767 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
768
769 if (ret >= 0)
770 ret = -EIO;
771
772 return ret;
773 }
774
775 dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
776
777 return 0;
778 }
779
pl2303_set_line_request(struct usb_serial_port * port,unsigned char buf[7])780 static int pl2303_set_line_request(struct usb_serial_port *port,
781 unsigned char buf[7])
782 {
783 struct usb_device *udev = port->serial->dev;
784 int ret;
785
786 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
787 SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
788 0, 0, buf, 7, 100);
789 if (ret < 0) {
790 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
791 return ret;
792 }
793
794 dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
795
796 return 0;
797 }
798
pl2303_termios_change(const struct ktermios * a,const struct ktermios * b)799 static bool pl2303_termios_change(const struct ktermios *a, const struct ktermios *b)
800 {
801 bool ixon_change;
802
803 ixon_change = ((a->c_iflag ^ b->c_iflag) & (IXON | IXANY)) ||
804 a->c_cc[VSTART] != b->c_cc[VSTART] ||
805 a->c_cc[VSTOP] != b->c_cc[VSTOP];
806
807 return tty_termios_hw_change(a, b) || ixon_change;
808 }
809
pl2303_enable_xonxoff(struct tty_struct * tty,const struct pl2303_type_data * type)810 static bool pl2303_enable_xonxoff(struct tty_struct *tty, const struct pl2303_type_data *type)
811 {
812 if (!I_IXON(tty) || I_IXANY(tty))
813 return false;
814
815 if (START_CHAR(tty) != 0x11 || STOP_CHAR(tty) != 0x13)
816 return false;
817
818 if (type->no_autoxonxoff)
819 return false;
820
821 return true;
822 }
823
pl2303_set_termios(struct tty_struct * tty,struct usb_serial_port * port,const struct ktermios * old_termios)824 static void pl2303_set_termios(struct tty_struct *tty,
825 struct usb_serial_port *port,
826 const struct ktermios *old_termios)
827 {
828 struct usb_serial *serial = port->serial;
829 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
830 struct pl2303_private *priv = usb_get_serial_port_data(port);
831 unsigned long flags;
832 unsigned char *buf;
833 int ret;
834 u8 control;
835
836 if (old_termios && !pl2303_termios_change(&tty->termios, old_termios))
837 return;
838
839 buf = kzalloc(7, GFP_KERNEL);
840 if (!buf) {
841 /* Report back no change occurred */
842 if (old_termios)
843 tty->termios = *old_termios;
844 return;
845 }
846
847 pl2303_get_line_request(port, buf);
848
849 buf[6] = tty_get_char_size(tty->termios.c_cflag);
850 dev_dbg(&port->dev, "data bits = %d\n", buf[6]);
851
852 /* For reference buf[0]:buf[3] baud rate value */
853 pl2303_encode_baud_rate(tty, port, &buf[0]);
854
855 /* For reference buf[4]=0 is 1 stop bits */
856 /* For reference buf[4]=1 is 1.5 stop bits */
857 /* For reference buf[4]=2 is 2 stop bits */
858 if (C_CSTOPB(tty)) {
859 /*
860 * NOTE: Comply with "real" UARTs / RS232:
861 * use 1.5 instead of 2 stop bits with 5 data bits
862 */
863 if (C_CSIZE(tty) == CS5) {
864 buf[4] = 1;
865 dev_dbg(&port->dev, "stop bits = 1.5\n");
866 } else {
867 buf[4] = 2;
868 dev_dbg(&port->dev, "stop bits = 2\n");
869 }
870 } else {
871 buf[4] = 0;
872 dev_dbg(&port->dev, "stop bits = 1\n");
873 }
874
875 if (C_PARENB(tty)) {
876 /* For reference buf[5]=0 is none parity */
877 /* For reference buf[5]=1 is odd parity */
878 /* For reference buf[5]=2 is even parity */
879 /* For reference buf[5]=3 is mark parity */
880 /* For reference buf[5]=4 is space parity */
881 if (C_PARODD(tty)) {
882 if (C_CMSPAR(tty)) {
883 buf[5] = 3;
884 dev_dbg(&port->dev, "parity = mark\n");
885 } else {
886 buf[5] = 1;
887 dev_dbg(&port->dev, "parity = odd\n");
888 }
889 } else {
890 if (C_CMSPAR(tty)) {
891 buf[5] = 4;
892 dev_dbg(&port->dev, "parity = space\n");
893 } else {
894 buf[5] = 2;
895 dev_dbg(&port->dev, "parity = even\n");
896 }
897 }
898 } else {
899 buf[5] = 0;
900 dev_dbg(&port->dev, "parity = none\n");
901 }
902
903 /*
904 * Some PL2303 are known to lose bytes if you change serial settings
905 * even to the same values as before. Thus we actually need to filter
906 * in this specific case.
907 *
908 * Note that the tty_termios_hw_change check above is not sufficient
909 * as a previously requested baud rate may differ from the one
910 * actually used (and stored in old_termios).
911 *
912 * NOTE: No additional locking needed for line_settings as it is
913 * only used in set_termios, which is serialised against itself.
914 */
915 if (!old_termios || memcmp(buf, priv->line_settings, 7)) {
916 ret = pl2303_set_line_request(port, buf);
917 if (!ret)
918 memcpy(priv->line_settings, buf, 7);
919 }
920
921 /* change control lines if we are switching to or from B0 */
922 spin_lock_irqsave(&priv->lock, flags);
923 control = priv->line_control;
924 if (C_BAUD(tty) == B0)
925 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
926 else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
927 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
928 if (control != priv->line_control) {
929 control = priv->line_control;
930 spin_unlock_irqrestore(&priv->lock, flags);
931 pl2303_set_control_lines(port, control);
932 } else {
933 spin_unlock_irqrestore(&priv->lock, flags);
934 }
935
936 if (C_CRTSCTS(tty)) {
937 if (spriv->quirks & PL2303_QUIRK_LEGACY) {
938 pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0x40);
939 } else if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
940 pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG,
941 PL2303_HXN_FLOWCTRL_MASK,
942 PL2303_HXN_FLOWCTRL_RTS_CTS);
943 } else {
944 pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0x60);
945 }
946 } else if (pl2303_enable_xonxoff(tty, spriv->type)) {
947 if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
948 pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG,
949 PL2303_HXN_FLOWCTRL_MASK,
950 PL2303_HXN_FLOWCTRL_XON_XOFF);
951 } else {
952 pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0xc0);
953 }
954 } else {
955 if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
956 pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG,
957 PL2303_HXN_FLOWCTRL_MASK,
958 PL2303_HXN_FLOWCTRL_NONE);
959 } else {
960 pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0);
961 }
962 }
963
964 kfree(buf);
965 }
966
pl2303_dtr_rts(struct usb_serial_port * port,int on)967 static void pl2303_dtr_rts(struct usb_serial_port *port, int on)
968 {
969 struct pl2303_private *priv = usb_get_serial_port_data(port);
970 unsigned long flags;
971 u8 control;
972
973 spin_lock_irqsave(&priv->lock, flags);
974 if (on)
975 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
976 else
977 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
978 control = priv->line_control;
979 spin_unlock_irqrestore(&priv->lock, flags);
980
981 pl2303_set_control_lines(port, control);
982 }
983
pl2303_close(struct usb_serial_port * port)984 static void pl2303_close(struct usb_serial_port *port)
985 {
986 usb_serial_generic_close(port);
987 usb_kill_urb(port->interrupt_in_urb);
988 pl2303_set_break(port, false);
989 }
990
pl2303_open(struct tty_struct * tty,struct usb_serial_port * port)991 static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port)
992 {
993 struct usb_serial *serial = port->serial;
994 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
995 int result;
996
997 if (spriv->quirks & PL2303_QUIRK_LEGACY) {
998 usb_clear_halt(serial->dev, port->write_urb->pipe);
999 usb_clear_halt(serial->dev, port->read_urb->pipe);
1000 } else {
1001 /* reset upstream data pipes */
1002 if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
1003 pl2303_vendor_write(serial, PL2303_HXN_RESET_REG,
1004 PL2303_HXN_RESET_UPSTREAM_PIPE |
1005 PL2303_HXN_RESET_DOWNSTREAM_PIPE);
1006 } else {
1007 pl2303_vendor_write(serial, 8, 0);
1008 pl2303_vendor_write(serial, 9, 0);
1009 }
1010 }
1011
1012 /* Setup termios */
1013 if (tty)
1014 pl2303_set_termios(tty, port, NULL);
1015
1016 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
1017 if (result) {
1018 dev_err(&port->dev, "failed to submit interrupt urb: %d\n",
1019 result);
1020 return result;
1021 }
1022
1023 result = usb_serial_generic_open(tty, port);
1024 if (result) {
1025 usb_kill_urb(port->interrupt_in_urb);
1026 return result;
1027 }
1028
1029 return 0;
1030 }
1031
pl2303_tiocmset(struct tty_struct * tty,unsigned int set,unsigned int clear)1032 static int pl2303_tiocmset(struct tty_struct *tty,
1033 unsigned int set, unsigned int clear)
1034 {
1035 struct usb_serial_port *port = tty->driver_data;
1036 struct pl2303_private *priv = usb_get_serial_port_data(port);
1037 unsigned long flags;
1038 u8 control;
1039 int ret;
1040
1041 spin_lock_irqsave(&priv->lock, flags);
1042 if (set & TIOCM_RTS)
1043 priv->line_control |= CONTROL_RTS;
1044 if (set & TIOCM_DTR)
1045 priv->line_control |= CONTROL_DTR;
1046 if (clear & TIOCM_RTS)
1047 priv->line_control &= ~CONTROL_RTS;
1048 if (clear & TIOCM_DTR)
1049 priv->line_control &= ~CONTROL_DTR;
1050 control = priv->line_control;
1051 spin_unlock_irqrestore(&priv->lock, flags);
1052
1053 ret = pl2303_set_control_lines(port, control);
1054 if (ret)
1055 return usb_translate_errors(ret);
1056
1057 return 0;
1058 }
1059
pl2303_tiocmget(struct tty_struct * tty)1060 static int pl2303_tiocmget(struct tty_struct *tty)
1061 {
1062 struct usb_serial_port *port = tty->driver_data;
1063 struct pl2303_private *priv = usb_get_serial_port_data(port);
1064 unsigned long flags;
1065 unsigned int mcr;
1066 unsigned int status;
1067 unsigned int result;
1068
1069 spin_lock_irqsave(&priv->lock, flags);
1070 mcr = priv->line_control;
1071 status = priv->line_status;
1072 spin_unlock_irqrestore(&priv->lock, flags);
1073
1074 result = ((mcr & CONTROL_DTR) ? TIOCM_DTR : 0)
1075 | ((mcr & CONTROL_RTS) ? TIOCM_RTS : 0)
1076 | ((status & UART_CTS) ? TIOCM_CTS : 0)
1077 | ((status & UART_DSR) ? TIOCM_DSR : 0)
1078 | ((status & UART_RING) ? TIOCM_RI : 0)
1079 | ((status & UART_DCD) ? TIOCM_CD : 0);
1080
1081 dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
1082
1083 return result;
1084 }
1085
pl2303_carrier_raised(struct usb_serial_port * port)1086 static int pl2303_carrier_raised(struct usb_serial_port *port)
1087 {
1088 struct pl2303_private *priv = usb_get_serial_port_data(port);
1089
1090 if (priv->line_status & UART_DCD)
1091 return 1;
1092
1093 return 0;
1094 }
1095
pl2303_set_break(struct usb_serial_port * port,bool enable)1096 static int pl2303_set_break(struct usb_serial_port *port, bool enable)
1097 {
1098 struct usb_serial *serial = port->serial;
1099 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
1100 u16 state;
1101 int result;
1102
1103 if (spriv->quirks & PL2303_QUIRK_NO_BREAK_GETLINE)
1104 return -ENOTTY;
1105
1106 if (enable)
1107 state = BREAK_ON;
1108 else
1109 state = BREAK_OFF;
1110
1111 dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1112 state == BREAK_OFF ? "off" : "on");
1113
1114 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1115 BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
1116 0, NULL, 0, 100);
1117 if (result) {
1118 dev_err(&port->dev, "error sending break = %d\n", result);
1119 return result;
1120 }
1121
1122 return 0;
1123 }
1124
pl2303_break_ctl(struct tty_struct * tty,int state)1125 static int pl2303_break_ctl(struct tty_struct *tty, int state)
1126 {
1127 struct usb_serial_port *port = tty->driver_data;
1128
1129 return pl2303_set_break(port, state);
1130 }
1131
pl2303_update_line_status(struct usb_serial_port * port,unsigned char * data,unsigned int actual_length)1132 static void pl2303_update_line_status(struct usb_serial_port *port,
1133 unsigned char *data,
1134 unsigned int actual_length)
1135 {
1136 struct usb_serial *serial = port->serial;
1137 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
1138 struct pl2303_private *priv = usb_get_serial_port_data(port);
1139 struct tty_struct *tty;
1140 unsigned long flags;
1141 unsigned int status_idx = UART_STATE_INDEX;
1142 u8 status;
1143 u8 delta;
1144
1145 if (spriv->quirks & PL2303_QUIRK_UART_STATE_IDX0)
1146 status_idx = 0;
1147
1148 if (actual_length < status_idx + 1)
1149 return;
1150
1151 status = data[status_idx];
1152
1153 /* Save off the uart status for others to look at */
1154 spin_lock_irqsave(&priv->lock, flags);
1155 delta = priv->line_status ^ status;
1156 priv->line_status = status;
1157 spin_unlock_irqrestore(&priv->lock, flags);
1158
1159 if (status & UART_BREAK_ERROR)
1160 usb_serial_handle_break(port);
1161
1162 if (delta & UART_STATE_MSR_MASK) {
1163 if (delta & UART_CTS)
1164 port->icount.cts++;
1165 if (delta & UART_DSR)
1166 port->icount.dsr++;
1167 if (delta & UART_RING)
1168 port->icount.rng++;
1169 if (delta & UART_DCD) {
1170 port->icount.dcd++;
1171 tty = tty_port_tty_get(&port->port);
1172 if (tty) {
1173 usb_serial_handle_dcd_change(port, tty,
1174 status & UART_DCD);
1175 tty_kref_put(tty);
1176 }
1177 }
1178
1179 wake_up_interruptible(&port->port.delta_msr_wait);
1180 }
1181 }
1182
pl2303_read_int_callback(struct urb * urb)1183 static void pl2303_read_int_callback(struct urb *urb)
1184 {
1185 struct usb_serial_port *port = urb->context;
1186 unsigned char *data = urb->transfer_buffer;
1187 unsigned int actual_length = urb->actual_length;
1188 int status = urb->status;
1189 int retval;
1190
1191 switch (status) {
1192 case 0:
1193 /* success */
1194 break;
1195 case -ECONNRESET:
1196 case -ENOENT:
1197 case -ESHUTDOWN:
1198 /* this urb is terminated, clean up */
1199 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
1200 __func__, status);
1201 return;
1202 default:
1203 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
1204 __func__, status);
1205 goto exit;
1206 }
1207
1208 usb_serial_debug_data(&port->dev, __func__,
1209 urb->actual_length, urb->transfer_buffer);
1210
1211 pl2303_update_line_status(port, data, actual_length);
1212
1213 exit:
1214 retval = usb_submit_urb(urb, GFP_ATOMIC);
1215 if (retval) {
1216 dev_err(&port->dev,
1217 "%s - usb_submit_urb failed with result %d\n",
1218 __func__, retval);
1219 }
1220 }
1221
pl2303_process_read_urb(struct urb * urb)1222 static void pl2303_process_read_urb(struct urb *urb)
1223 {
1224 struct usb_serial_port *port = urb->context;
1225 struct pl2303_private *priv = usb_get_serial_port_data(port);
1226 unsigned char *data = urb->transfer_buffer;
1227 char tty_flag = TTY_NORMAL;
1228 unsigned long flags;
1229 u8 line_status;
1230 int i;
1231
1232 /* update line status */
1233 spin_lock_irqsave(&priv->lock, flags);
1234 line_status = priv->line_status;
1235 priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
1236 spin_unlock_irqrestore(&priv->lock, flags);
1237
1238 if (!urb->actual_length)
1239 return;
1240
1241 /*
1242 * Break takes precedence over parity, which takes precedence over
1243 * framing errors.
1244 */
1245 if (line_status & UART_BREAK_ERROR)
1246 tty_flag = TTY_BREAK;
1247 else if (line_status & UART_PARITY_ERROR)
1248 tty_flag = TTY_PARITY;
1249 else if (line_status & UART_FRAME_ERROR)
1250 tty_flag = TTY_FRAME;
1251
1252 if (tty_flag != TTY_NORMAL)
1253 dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__,
1254 tty_flag);
1255 /* overrun is special, not associated with a char */
1256 if (line_status & UART_OVERRUN_ERROR)
1257 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
1258
1259 if (port->sysrq) {
1260 for (i = 0; i < urb->actual_length; ++i)
1261 if (!usb_serial_handle_sysrq_char(port, data[i]))
1262 tty_insert_flip_char(&port->port, data[i],
1263 tty_flag);
1264 } else {
1265 tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag,
1266 urb->actual_length);
1267 }
1268
1269 tty_flip_buffer_push(&port->port);
1270 }
1271
1272 static struct usb_serial_driver pl2303_device = {
1273 .driver = {
1274 .name = "pl2303",
1275 },
1276 .id_table = id_table,
1277 .num_bulk_in = 1,
1278 .num_bulk_out = 1,
1279 .num_interrupt_in = 0, /* see pl2303_calc_num_ports */
1280 .bulk_in_size = 256,
1281 .bulk_out_size = 256,
1282 .open = pl2303_open,
1283 .close = pl2303_close,
1284 .dtr_rts = pl2303_dtr_rts,
1285 .carrier_raised = pl2303_carrier_raised,
1286 .break_ctl = pl2303_break_ctl,
1287 .set_termios = pl2303_set_termios,
1288 .tiocmget = pl2303_tiocmget,
1289 .tiocmset = pl2303_tiocmset,
1290 .tiocmiwait = usb_serial_generic_tiocmiwait,
1291 .process_read_urb = pl2303_process_read_urb,
1292 .read_int_callback = pl2303_read_int_callback,
1293 .probe = pl2303_probe,
1294 .calc_num_ports = pl2303_calc_num_ports,
1295 .attach = pl2303_startup,
1296 .release = pl2303_release,
1297 .port_probe = pl2303_port_probe,
1298 .port_remove = pl2303_port_remove,
1299 };
1300
1301 static struct usb_serial_driver * const serial_drivers[] = {
1302 &pl2303_device, NULL
1303 };
1304
1305 module_usb_serial_driver(serial_drivers, id_table);
1306
1307 MODULE_DESCRIPTION("Prolific PL2303 USB to serial adaptor driver");
1308 MODULE_LICENSE("GPL v2");
1309