Version:  2.0.40 2.2.26 2.4.37 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0

Linux/drivers/usb/serial/pl2303.c

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

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