Version:  2.0.40 2.2.26 2.4.37 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6

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

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