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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  * Copyright (C) 2009, 2013 Frank Schäfer <fschaefer.oss@googlemail.com>
8  *  - fixes, improvements and documentation for the baud rate encoding methods
9  * Copyright (C) 2013 Reinhard Max <max@suse.de>
10  *  - fixes and improvements for the divisor based baud rate encoding method
11  *
12  * Original driver for 2.2.x by anonymous
13  *
14  *      This program is free software; you can redistribute it and/or
15  *      modify it under the terms of the GNU General Public License version
16  *      2 as published by the Free Software Foundation.
17  *
18  * See Documentation/usb/usb-serial.txt for more information on using this
19  * driver
20  *
21  */
22
23 #include <linux/kernel.h>
24 #include <linux/errno.h>
25 #include <linux/init.h>
26 #include <linux/slab.h>
27 #include <linux/tty.h>
28 #include <linux/tty_driver.h>
29 #include <linux/tty_flip.h>
30 #include <linux/serial.h>
31 #include <linux/module.h>
32 #include <linux/moduleparam.h>
33 #include <linux/spinlock.h>
34 #include <linux/uaccess.h>
35 #include <linux/usb.h>
36 #include <linux/usb/serial.h>
37 #include <asm/unaligned.h>
38 #include "pl2303.h"
39
40 /*
41  * Version Information
42  */
43 #define DRIVER_DESC "Prolific PL2303 USB to serial adaptor driver"
44
45 static const struct usb_device_id id_table[] = {
46         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID) },
47         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) },
48         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_DCU11) },
49         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ3) },
50         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_PHAROS) },
51         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ALDIGA) },
52         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MMX) },
53         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GPRS) },
54         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_HCR331) },
55         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MOTOROLA) },
56         { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
57         { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID_RSAQ5) },
58         { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID) },
59         { USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) },
60         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },
61         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) },
62         { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) },
63         { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID_2080) },
64         { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) },
65         { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) },
66         { USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) },
67         { USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) },
68         { USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) },
69         { USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) },
70         { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) },
71         { USB_DEVICE(SAMSUNG_VENDOR_ID, SAMSUNG_PRODUCT_ID) },
72         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1) },
73         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65) },
74         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75) },
75         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_EF81) },
76         { USB_DEVICE(BENQ_VENDOR_ID, BENQ_PRODUCT_ID_S81) }, /* Benq/Siemens S81 */
77         { USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) },
78         { USB_DEVICE(NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID) },
79         { USB_DEVICE(CA_42_CA42_VENDOR_ID, CA_42_CA42_PRODUCT_ID) },
80         { USB_DEVICE(SAGEM_VENDOR_ID, SAGEM_PRODUCT_ID) },
81         { USB_DEVICE(LEADTEK_VENDOR_ID, LEADTEK_9531_PRODUCT_ID) },
82         { USB_DEVICE(SPEEDDRAGON_VENDOR_ID, SPEEDDRAGON_PRODUCT_ID) },
83         { USB_DEVICE(DATAPILOT_U2_VENDOR_ID, DATAPILOT_U2_PRODUCT_ID) },
84         { USB_DEVICE(BELKIN_VENDOR_ID, BELKIN_PRODUCT_ID) },
85         { USB_DEVICE(ALCOR_VENDOR_ID, ALCOR_PRODUCT_ID) },
86         { USB_DEVICE(WS002IN_VENDOR_ID, WS002IN_PRODUCT_ID) },
87         { USB_DEVICE(COREGA_VENDOR_ID, COREGA_PRODUCT_ID) },
88         { USB_DEVICE(YCCABLE_VENDOR_ID, YCCABLE_PRODUCT_ID) },
89         { USB_DEVICE(SUPERIAL_VENDOR_ID, SUPERIAL_PRODUCT_ID) },
90         { USB_DEVICE(HP_VENDOR_ID, HP_LD220_PRODUCT_ID) },
91         { USB_DEVICE(CRESSI_VENDOR_ID, CRESSI_EDY_PRODUCT_ID) },
92         { USB_DEVICE(ZEAGLE_VENDOR_ID, ZEAGLE_N2ITION3_PRODUCT_ID) },
93         { USB_DEVICE(SONY_VENDOR_ID, SONY_QN3USB_PRODUCT_ID) },
94         { USB_DEVICE(SANWA_VENDOR_ID, SANWA_PRODUCT_ID) },
95         { USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530_PRODUCT_ID) },
96         { USB_DEVICE(SMART_VENDOR_ID, SMART_PRODUCT_ID) },
97         { }                                     /* Terminating entry */
98 };
99
100 MODULE_DEVICE_TABLE(usb, id_table);
101
102 #define SET_LINE_REQUEST_TYPE           0x21
103 #define SET_LINE_REQUEST                0x20
104
105 #define SET_CONTROL_REQUEST_TYPE        0x21
106 #define SET_CONTROL_REQUEST             0x22
107 #define CONTROL_DTR                     0x01
108 #define CONTROL_RTS                     0x02
109
110 #define BREAK_REQUEST_TYPE              0x21
111 #define BREAK_REQUEST                   0x23
112 #define BREAK_ON                        0xffff
113 #define BREAK_OFF                       0x0000
114
115 #define GET_LINE_REQUEST_TYPE           0xa1
116 #define GET_LINE_REQUEST                0x21
117
118 #define VENDOR_WRITE_REQUEST_TYPE       0x40
119 #define VENDOR_WRITE_REQUEST            0x01
120
121 #define VENDOR_READ_REQUEST_TYPE        0xc0
122 #define VENDOR_READ_REQUEST             0x01
123
124 #define UART_STATE                      0x08
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
136 enum pl2303_type {
137         type_0,         /* don't know the difference between type 0 and */
138         type_1,         /* type 1, until someone from prolific tells us... */
139         HX,             /* HX version of the pl2303 chip */
140 };
141
142 struct pl2303_serial_private {
143         enum pl2303_type type;
144 };
145
146 struct pl2303_private {
147         spinlock_t lock;
148         u8 line_control;
149         u8 line_status;
150 };
151
152 static int pl2303_vendor_read(__u16 value, __u16 index,
153                 struct usb_serial *serial, unsigned char *buf)
154 {
155         int res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
156                         VENDOR_READ_REQUEST, VENDOR_READ_REQUEST_TYPE,
157                         value, index, buf, 1, 100);
158         dev_dbg(&serial->interface->dev, "0x%x:0x%x:0x%x:0x%x  %d - %x\n",
159                 VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, value, index,
160                 res, buf[0]);
161         return res;
162 }
163
164 static int pl2303_vendor_write(__u16 value, __u16 index,
165                 struct usb_serial *serial)
166 {
167         int res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
168                         VENDOR_WRITE_REQUEST, VENDOR_WRITE_REQUEST_TYPE,
169                         value, index, NULL, 0, 100);
170         dev_dbg(&serial->interface->dev, "0x%x:0x%x:0x%x:0x%x  %d\n",
171                 VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, value, index,
172                 res);
173         return res;
174 }
175
176 static int pl2303_startup(struct usb_serial *serial)
177 {
178         struct pl2303_serial_private *spriv;
179         enum pl2303_type type = type_0;
180         unsigned char *buf;
181
182         spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
183         if (!spriv)
184                 return -ENOMEM;
185
186         buf = kmalloc(10, GFP_KERNEL);
187         if (!buf) {
188                 kfree(spriv);
189                 return -ENOMEM;
190         }
191
192         if (serial->dev->descriptor.bDeviceClass == 0x02)
193                 type = type_0;
194         else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40)
195                 type = HX;
196         else if (serial->dev->descriptor.bDeviceClass == 0x00
197                  || serial->dev->descriptor.bDeviceClass == 0xFF)
198                 type = type_1;
199         dev_dbg(&serial->interface->dev, "device type: %d\n", type);
200
201         spriv->type = type;
202         usb_set_serial_data(serial, spriv);
203
204         pl2303_vendor_read(0x8484, 0, serial, buf);
205         pl2303_vendor_write(0x0404, 0, serial);
206         pl2303_vendor_read(0x8484, 0, serial, buf);
207         pl2303_vendor_read(0x8383, 0, serial, buf);
208         pl2303_vendor_read(0x8484, 0, serial, buf);
209         pl2303_vendor_write(0x0404, 1, serial);
210         pl2303_vendor_read(0x8484, 0, serial, buf);
211         pl2303_vendor_read(0x8383, 0, serial, buf);
212         pl2303_vendor_write(0, 1, serial);
213         pl2303_vendor_write(1, 0, serial);
214         if (type == HX)
215                 pl2303_vendor_write(2, 0x44, serial);
216         else
217                 pl2303_vendor_write(2, 0x24, serial);
218
219         kfree(buf);
220         return 0;
221 }
222
223 static void pl2303_release(struct usb_serial *serial)
224 {
225         struct pl2303_serial_private *spriv;
226
227         spriv = usb_get_serial_data(serial);
228         kfree(spriv);
229 }
230
231 static int pl2303_port_probe(struct usb_serial_port *port)
232 {
233         struct pl2303_private *priv;
234
235         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
236         if (!priv)
237                 return -ENOMEM;
238
239         spin_lock_init(&priv->lock);
240
241         usb_set_serial_port_data(port, priv);
242
243         port->port.drain_delay = 256;
244
245         return 0;
246 }
247
248 static int pl2303_port_remove(struct usb_serial_port *port)
249 {
250         struct pl2303_private *priv;
251
252         priv = usb_get_serial_port_data(port);
253         kfree(priv);
254
255         return 0;
256 }
257
258 static int pl2303_set_control_lines(struct usb_serial_port *port, u8 value)
259 {
260         struct usb_device *dev = port->serial->dev;
261         int retval;
262
263         retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
264                                  SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
265                                  value, 0, NULL, 0, 100);
266         dev_dbg(&port->dev, "%s - value = %d, retval = %d\n", __func__,
267                 value, retval);
268         return retval;
269 }
270
271 static int pl2303_baudrate_encode_direct(int baud, enum pl2303_type type,
272                                                                       u8 buf[4])
273 {
274         /*
275          * NOTE: Only the values defined in baud_sup are supported !
276          *       => if unsupported values are set, the PL2303 seems to
277          *          use 9600 baud (at least my PL2303X always does)
278          */
279         const int baud_sup[] = { 75, 150, 300, 600, 1200, 1800, 2400, 3600,
280                                  4800, 7200, 9600, 14400, 19200, 28800, 38400,
281                                  57600, 115200, 230400, 460800, 614400, 921600,
282                                  1228800, 2457600, 3000000, 6000000 };
283         /*
284          * NOTE: The PL2303HX (tested with rev. 3A) also supports the following
285          * baud rates: 128000, 134400, 161280, 201600, 268800, 403200, 806400.
286          * As long as we are not using this encoding method for them, there is
287          * no point in complicating the code to support them.
288          */
289         int i;
290
291         /* Set baudrate to nearest supported value */
292         for (i = 0; i < ARRAY_SIZE(baud_sup); ++i) {
293                 if (baud_sup[i] > baud)
294                         break;
295         }
296         if (i == ARRAY_SIZE(baud_sup))
297                 baud = baud_sup[i - 1];
298         else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1]))
299                 baud = baud_sup[i - 1];
300         else
301                 baud = baud_sup[i];
302         /* type_0, type_1 only support up to 1228800 baud */
303         if (type != HX)
304                 baud = min_t(int, baud, 1228800);
305         /* Direct (standard) baud rate encoding method */
306         put_unaligned_le32(baud, buf);
307
308         return baud;
309 }
310
311 static int pl2303_baudrate_encode_divisor(int baud, enum pl2303_type type,
312                                                                       u8 buf[4])
313 {
314         /*
315          * Divisor based baud rate encoding method
316          *
317          * NOTE: it's not clear if the type_0/1 chips support this method
318          *
319          * divisor = 12MHz * 32 / baudrate = 2^A * B
320          *
321          * with
322          *
323          * A = buf[1] & 0x0e
324          * B = buf[0]  +  (buf[1] & 0x01) << 8
325          *
326          * Special cases:
327          * => 8 < B < 16: device seems to work not properly
328          * => B <= 8: device uses the max. value B = 512 instead
329          */
330         unsigned int A, B;
331
332         /*
333          * NOTE: The Windows driver allows maximum baud rates of 110% of the
334          * specified maximium value.
335          * Quick tests with early (2004) HX (rev. A) chips suggest, that even
336          * higher baud rates (up to the maximum of 24M baud !) are working fine,
337          * but that should really be tested carefully in "real life" scenarios
338          * before removing the upper limit completely.
339          * Baud rates smaller than the specified 75 baud are definitely working
340          * fine.
341          */
342         if (type == HX)
343                 baud = min_t(int, baud, 6000000 * 1.1);
344         else
345                 baud = min_t(int, baud, 1228800 * 1.1);
346         /* Determine factors A and B */
347         A = 0;
348         B = 12000000 * 32 / baud;  /* 12MHz */
349         B <<= 1; /* Add one bit for rounding */
350         while (B > (512 << 1) && A <= 14) {
351                 A += 2;
352                 B >>= 2;
353         }
354         if (A > 14) { /* max. divisor = min. baudrate reached */
355                 A = 14;
356                 B = 512;
357                 /* => ~45.78 baud */
358         } else {
359                 B = (B + 1) >> 1; /* Round the last bit */
360         }
361         /* Handle special cases */
362         if (B == 512)
363                 B = 0; /* also: 1 to 8 */
364         else if (B < 16)
365                 /*
366                  * NOTE: With the current algorithm this happens
367                  * only for A=0 and means that the min. divisor
368                  * (respectively: the max. baudrate) is reached.
369                  */
370                 B = 16;         /* => 24 MBaud */
371         /* Encode the baud rate */
372         buf[3] = 0x80;     /* Select divisor encoding method */
373         buf[2] = 0;
374         buf[1] = (A & 0x0e);            /* A */
375         buf[1] |= ((B & 0x100) >> 8);   /* MSB of B */
376         buf[0] = B & 0xff;              /* 8 LSBs of B */
377         /* Calculate the actual/resulting baud rate */
378         if (B <= 8)
379                 B = 512;
380         baud = 12000000 * 32 / ((1 << A) * B);
381
382         return baud;
383 }
384
385 static void pl2303_encode_baudrate(struct tty_struct *tty,
386                                         struct usb_serial_port *port,
387                                         enum pl2303_type type,
388                                         u8 buf[4])
389 {
390         int baud;
391
392         baud = tty_get_baud_rate(tty);
393         dev_dbg(&port->dev, "baud requested = %d\n", baud);
394         if (!baud)
395                 return;
396         /*
397          * There are two methods for setting/encoding the baud rate
398          * 1) Direct method: encodes the baud rate value directly
399          *    => supported by all chip types
400          * 2) Divisor based method: encodes a divisor to a base value (12MHz*32)
401          *    => supported by HX chips (and likely not by type_0/1 chips)
402          *
403          * NOTE: Although the divisor based baud rate encoding method is much
404          * more flexible, some of the standard baud rate values can not be
405          * realized exactly. But the difference is very small (max. 0.2%) and
406          * the device likely uses the same baud rate generator for both methods
407          * so that there is likley no difference.
408          */
409         if (type != HX)
410                 baud = pl2303_baudrate_encode_direct(baud, type, buf);
411         else
412                 baud = pl2303_baudrate_encode_divisor(baud, type, buf);
413         /* Save resulting baud rate */
414         tty_encode_baud_rate(tty, baud, baud);
415         dev_dbg(&port->dev, "baud set = %d\n", baud);
416 }
417
418 static void pl2303_set_termios(struct tty_struct *tty,
419                 struct usb_serial_port *port, struct ktermios *old_termios)
420 {
421         struct usb_serial *serial = port->serial;
422         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
423         struct pl2303_private *priv = usb_get_serial_port_data(port);
424         unsigned long flags;
425         unsigned char *buf;
426         int i;
427         u8 control;
428
429         /*
430          * The PL2303 is reported to lose bytes if you change serial settings
431          * even to the same values as before. Thus we actually need to filter
432          * in this specific case.
433          */
434         if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios))
435                 return;
436
437         buf = kzalloc(7, GFP_KERNEL);
438         if (!buf) {
439                 dev_err(&port->dev, "%s - out of memory.\n", __func__);
440                 /* Report back no change occurred */
441                 if (old_termios)
442                         tty->termios = *old_termios;
443                 return;
444         }
445
446         i = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
447                             GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
448                             0, 0, buf, 7, 100);
449         dev_dbg(&port->dev, "0xa1:0x21:0:0  %d - %7ph\n", i, buf);
450
451         if (C_CSIZE(tty)) {
452                 switch (C_CSIZE(tty)) {
453                 case CS5:
454                         buf[6] = 5;
455                         break;
456                 case CS6:
457                         buf[6] = 6;
458                         break;
459                 case CS7:
460                         buf[6] = 7;
461                         break;
462                 default:
463                 case CS8:
464                         buf[6] = 8;
465                 }
466                 dev_dbg(&port->dev, "data bits = %d\n", buf[6]);
467         }
468
469         /* For reference:   buf[0]:buf[3] baud rate value */
470         pl2303_encode_baudrate(tty, port, spriv->type, buf);
471
472         /* For reference buf[4]=0 is 1 stop bits */
473         /* For reference buf[4]=1 is 1.5 stop bits */
474         /* For reference buf[4]=2 is 2 stop bits */
475         if (C_CSTOPB(tty)) {
476                 /*
477                  * NOTE: Comply with "real" UARTs / RS232:
478                  *       use 1.5 instead of 2 stop bits with 5 data bits
479                  */
480                 if (C_CSIZE(tty) == CS5) {
481                         buf[4] = 1;
482                         dev_dbg(&port->dev, "stop bits = 1.5\n");
483                 } else {
484                         buf[4] = 2;
485                         dev_dbg(&port->dev, "stop bits = 2\n");
486                 }
487         } else {
488                 buf[4] = 0;
489                 dev_dbg(&port->dev, "stop bits = 1\n");
490         }
491
492         if (C_PARENB(tty)) {
493                 /* For reference buf[5]=0 is none parity */
494                 /* For reference buf[5]=1 is odd parity */
495                 /* For reference buf[5]=2 is even parity */
496                 /* For reference buf[5]=3 is mark parity */
497                 /* For reference buf[5]=4 is space parity */
498                 if (C_PARODD(tty)) {
499                         if (tty->termios.c_cflag & CMSPAR) {
500                                 buf[5] = 3;
501                                 dev_dbg(&port->dev, "parity = mark\n");
502                         } else {
503                                 buf[5] = 1;
504                                 dev_dbg(&port->dev, "parity = odd\n");
505                         }
506                 } else {
507                         if (tty->termios.c_cflag & CMSPAR) {
508                                 buf[5] = 4;
509                                 dev_dbg(&port->dev, "parity = space\n");
510                         } else {
511                                 buf[5] = 2;
512                                 dev_dbg(&port->dev, "parity = even\n");
513                         }
514                 }
515         } else {
516                 buf[5] = 0;
517                 dev_dbg(&port->dev, "parity = none\n");
518         }
519
520         i = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
521                             SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
522                             0, 0, buf, 7, 100);
523         dev_dbg(&port->dev, "0x21:0x20:0:0  %d\n", i);
524
525         /* change control lines if we are switching to or from B0 */
526         spin_lock_irqsave(&priv->lock, flags);
527         control = priv->line_control;
528         if (C_BAUD(tty) == B0)
529                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
530         else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
531                 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
532         if (control != priv->line_control) {
533                 control = priv->line_control;
534                 spin_unlock_irqrestore(&priv->lock, flags);
535                 pl2303_set_control_lines(port, control);
536         } else {
537                 spin_unlock_irqrestore(&priv->lock, flags);
538         }
539
540         memset(buf, 0, 7);
541         i = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
542                             GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
543                             0, 0, buf, 7, 100);
544         dev_dbg(&port->dev, "0xa1:0x21:0:0  %d - %7ph\n", i, buf);
545
546         if (C_CRTSCTS(tty)) {
547                 if (spriv->type == HX)
548                         pl2303_vendor_write(0x0, 0x61, serial);
549                 else
550                         pl2303_vendor_write(0x0, 0x41, serial);
551         } else {
552                 pl2303_vendor_write(0x0, 0x0, serial);
553         }
554
555         kfree(buf);
556 }
557
558 static void pl2303_dtr_rts(struct usb_serial_port *port, int on)
559 {
560         struct pl2303_private *priv = usb_get_serial_port_data(port);
561         unsigned long flags;
562         u8 control;
563
564         spin_lock_irqsave(&priv->lock, flags);
565         /* Change DTR and RTS */
566         if (on)
567                 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
568         else
569                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
570         control = priv->line_control;
571         spin_unlock_irqrestore(&priv->lock, flags);
572         pl2303_set_control_lines(port, control);
573 }
574
575 static void pl2303_close(struct usb_serial_port *port)
576 {
577         usb_serial_generic_close(port);
578         usb_kill_urb(port->interrupt_in_urb);
579 }
580
581 static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port)
582 {
583         struct usb_serial *serial = port->serial;
584         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
585         int result;
586
587         if (spriv->type != HX) {
588                 usb_clear_halt(serial->dev, port->write_urb->pipe);
589                 usb_clear_halt(serial->dev, port->read_urb->pipe);
590         } else {
591                 /* reset upstream data pipes */
592                 pl2303_vendor_write(8, 0, serial);
593                 pl2303_vendor_write(9, 0, serial);
594         }
595
596         /* Setup termios */
597         if (tty)
598                 pl2303_set_termios(tty, port, NULL);
599
600         result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
601         if (result) {
602                 dev_err(&port->dev, "%s - failed submitting interrupt urb,"
603                         " error %d\n", __func__, result);
604                 return result;
605         }
606
607         result = usb_serial_generic_open(tty, port);
608         if (result) {
609                 usb_kill_urb(port->interrupt_in_urb);
610                 return result;
611         }
612
613         return 0;
614 }
615
616 static int pl2303_tiocmset(struct tty_struct *tty,
617                            unsigned int set, unsigned int clear)
618 {
619         struct usb_serial_port *port = tty->driver_data;
620         struct pl2303_private *priv = usb_get_serial_port_data(port);
621         unsigned long flags;
622         u8 control;
623         int ret;
624
625         spin_lock_irqsave(&priv->lock, flags);
626         if (set & TIOCM_RTS)
627                 priv->line_control |= CONTROL_RTS;
628         if (set & TIOCM_DTR)
629                 priv->line_control |= CONTROL_DTR;
630         if (clear & TIOCM_RTS)
631                 priv->line_control &= ~CONTROL_RTS;
632         if (clear & TIOCM_DTR)
633                 priv->line_control &= ~CONTROL_DTR;
634         control = priv->line_control;
635         spin_unlock_irqrestore(&priv->lock, flags);
636
637         ret = pl2303_set_control_lines(port, control);
638         if (ret)
639                 return usb_translate_errors(ret);
640
641         return 0;
642 }
643
644 static int pl2303_tiocmget(struct tty_struct *tty)
645 {
646         struct usb_serial_port *port = tty->driver_data;
647         struct pl2303_private *priv = usb_get_serial_port_data(port);
648         unsigned long flags;
649         unsigned int mcr;
650         unsigned int status;
651         unsigned int result;
652
653         spin_lock_irqsave(&priv->lock, flags);
654         mcr = priv->line_control;
655         status = priv->line_status;
656         spin_unlock_irqrestore(&priv->lock, flags);
657
658         result = ((mcr & CONTROL_DTR)           ? TIOCM_DTR : 0)
659                   | ((mcr & CONTROL_RTS)        ? TIOCM_RTS : 0)
660                   | ((status & UART_CTS)        ? TIOCM_CTS : 0)
661                   | ((status & UART_DSR)        ? TIOCM_DSR : 0)
662                   | ((status & UART_RING)       ? TIOCM_RI  : 0)
663                   | ((status & UART_DCD)        ? TIOCM_CD  : 0);
664
665         dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
666
667         return result;
668 }
669
670 static int pl2303_carrier_raised(struct usb_serial_port *port)
671 {
672         struct pl2303_private *priv = usb_get_serial_port_data(port);
673         if (priv->line_status & UART_DCD)
674                 return 1;
675         return 0;
676 }
677
678 static int pl2303_tiocmiwait(struct tty_struct *tty, unsigned long arg)
679 {
680         struct usb_serial_port *port = tty->driver_data;
681         struct pl2303_private *priv = usb_get_serial_port_data(port);
682         unsigned long flags;
683         unsigned int prevstatus;
684         unsigned int status;
685         unsigned int changed;
686
687         spin_lock_irqsave(&priv->lock, flags);
688         prevstatus = priv->line_status;
689         spin_unlock_irqrestore(&priv->lock, flags);
690
691         while (1) {
692                 interruptible_sleep_on(&port->port.delta_msr_wait);
693                 /* see if a signal did it */
694                 if (signal_pending(current))
695                         return -ERESTARTSYS;
696
697                 if (port->serial->disconnected)
698                         return -EIO;
699
700                 spin_lock_irqsave(&priv->lock, flags);
701                 status = priv->line_status;
702                 spin_unlock_irqrestore(&priv->lock, flags);
703
704                 changed = prevstatus ^ status;
705
706                 if (((arg & TIOCM_RNG) && (changed & UART_RING)) ||
707                     ((arg & TIOCM_DSR) && (changed & UART_DSR)) ||
708                     ((arg & TIOCM_CD)  && (changed & UART_DCD)) ||
709                     ((arg & TIOCM_CTS) && (changed & UART_CTS))) {
710                         return 0;
711                 }
712                 prevstatus = status;
713         }
714         /* NOTREACHED */
715         return 0;
716 }
717
718 static int pl2303_ioctl(struct tty_struct *tty,
719                         unsigned int cmd, unsigned long arg)
720 {
721         struct serial_struct ser;
722         struct usb_serial_port *port = tty->driver_data;
723
724         dev_dbg(&port->dev, "%s cmd = 0x%04x\n", __func__, cmd);
725
726         switch (cmd) {
727         case TIOCGSERIAL:
728                 memset(&ser, 0, sizeof ser);
729                 ser.type = PORT_16654;
730                 ser.line = port->minor;
731                 ser.port = port->port_number;
732                 ser.baud_base = 460800;
733
734                 if (copy_to_user((void __user *)arg, &ser, sizeof ser))
735                         return -EFAULT;
736
737                 return 0;
738         default:
739                 dev_dbg(&port->dev, "%s not supported = 0x%04x\n", __func__, cmd);
740                 break;
741         }
742         return -ENOIOCTLCMD;
743 }
744
745 static void pl2303_break_ctl(struct tty_struct *tty, int break_state)
746 {
747         struct usb_serial_port *port = tty->driver_data;
748         struct usb_serial *serial = port->serial;
749         u16 state;
750         int result;
751
752         if (break_state == 0)
753                 state = BREAK_OFF;
754         else
755                 state = BREAK_ON;
756         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
757                         state == BREAK_OFF ? "off" : "on");
758
759         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
760                                  BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
761                                  0, NULL, 0, 100);
762         if (result)
763                 dev_err(&port->dev, "error sending break = %d\n", result);
764 }
765
766 static void pl2303_update_line_status(struct usb_serial_port *port,
767                                       unsigned char *data,
768                                       unsigned int actual_length)
769 {
770
771         struct pl2303_private *priv = usb_get_serial_port_data(port);
772         struct tty_struct *tty;
773         unsigned long flags;
774         u8 status_idx = UART_STATE;
775         u8 length = UART_STATE + 1;
776         u8 prev_line_status;
777         u16 idv, idp;
778
779         idv = le16_to_cpu(port->serial->dev->descriptor.idVendor);
780         idp = le16_to_cpu(port->serial->dev->descriptor.idProduct);
781
782
783         if (idv == SIEMENS_VENDOR_ID) {
784                 if (idp == SIEMENS_PRODUCT_ID_X65 ||
785                     idp == SIEMENS_PRODUCT_ID_SX1 ||
786                     idp == SIEMENS_PRODUCT_ID_X75) {
787
788                         length = 1;
789                         status_idx = 0;
790                 }
791         }
792
793         if (actual_length < length)
794                 return;
795
796         /* Save off the uart status for others to look at */
797         spin_lock_irqsave(&priv->lock, flags);
798         prev_line_status = priv->line_status;
799         priv->line_status = data[status_idx];
800         spin_unlock_irqrestore(&priv->lock, flags);
801         if (priv->line_status & UART_BREAK_ERROR)
802                 usb_serial_handle_break(port);
803         wake_up_interruptible(&port->port.delta_msr_wait);
804
805         tty = tty_port_tty_get(&port->port);
806         if (!tty)
807                 return;
808         if ((priv->line_status ^ prev_line_status) & UART_DCD)
809                 usb_serial_handle_dcd_change(port, tty,
810                                 priv->line_status & UART_DCD);
811         tty_kref_put(tty);
812 }
813
814 static void pl2303_read_int_callback(struct urb *urb)
815 {
816         struct usb_serial_port *port =  urb->context;
817         unsigned char *data = urb->transfer_buffer;
818         unsigned int actual_length = urb->actual_length;
819         int status = urb->status;
820         int retval;
821
822         switch (status) {
823         case 0:
824                 /* success */
825                 break;
826         case -ECONNRESET:
827         case -ENOENT:
828         case -ESHUTDOWN:
829                 /* this urb is terminated, clean up */
830                 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
831                         __func__, status);
832                 return;
833         default:
834                 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
835                         __func__, status);
836                 goto exit;
837         }
838
839         usb_serial_debug_data(&port->dev, __func__,
840                               urb->actual_length, urb->transfer_buffer);
841
842         pl2303_update_line_status(port, data, actual_length);
843
844 exit:
845         retval = usb_submit_urb(urb, GFP_ATOMIC);
846         if (retval)
847                 dev_err(&port->dev,
848                         "%s - usb_submit_urb failed with result %d\n",
849                         __func__, retval);
850 }
851
852 static void pl2303_process_read_urb(struct urb *urb)
853 {
854         struct usb_serial_port *port = urb->context;
855         struct pl2303_private *priv = usb_get_serial_port_data(port);
856         unsigned char *data = urb->transfer_buffer;
857         char tty_flag = TTY_NORMAL;
858         unsigned long flags;
859         u8 line_status;
860         int i;
861
862         /* update line status */
863         spin_lock_irqsave(&priv->lock, flags);
864         line_status = priv->line_status;
865         priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
866         spin_unlock_irqrestore(&priv->lock, flags);
867         wake_up_interruptible(&port->port.delta_msr_wait);
868
869         if (!urb->actual_length)
870                 return;
871
872         /* break takes precedence over parity, */
873         /* which takes precedence over framing errors */
874         if (line_status & UART_BREAK_ERROR)
875                 tty_flag = TTY_BREAK;
876         else if (line_status & UART_PARITY_ERROR)
877                 tty_flag = TTY_PARITY;
878         else if (line_status & UART_FRAME_ERROR)
879                 tty_flag = TTY_FRAME;
880
881         if (tty_flag != TTY_NORMAL)
882                 dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__,
883                                                                 tty_flag);
884         /* overrun is special, not associated with a char */
885         if (line_status & UART_OVERRUN_ERROR)
886                 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
887
888         if (port->port.console && port->sysrq) {
889                 for (i = 0; i < urb->actual_length; ++i)
890                         if (!usb_serial_handle_sysrq_char(port, data[i]))
891                                 tty_insert_flip_char(&port->port, data[i],
892                                                 tty_flag);
893         } else {
894                 tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag,
895                                                         urb->actual_length);
896         }
897
898         tty_flip_buffer_push(&port->port);
899 }
900
901 /* All of the device info needed for the PL2303 SIO serial converter */
902 static struct usb_serial_driver pl2303_device = {
903         .driver = {
904                 .owner =        THIS_MODULE,
905                 .name =         "pl2303",
906         },
907         .id_table =             id_table,
908         .num_ports =            1,
909         .bulk_in_size =         256,
910         .bulk_out_size =        256,
911         .open =                 pl2303_open,
912         .close =                pl2303_close,
913         .dtr_rts =              pl2303_dtr_rts,
914         .carrier_raised =       pl2303_carrier_raised,
915         .ioctl =                pl2303_ioctl,
916         .break_ctl =            pl2303_break_ctl,
917         .set_termios =          pl2303_set_termios,
918         .tiocmget =             pl2303_tiocmget,
919         .tiocmset =             pl2303_tiocmset,
920         .tiocmiwait =           pl2303_tiocmiwait,
921         .process_read_urb =     pl2303_process_read_urb,
922         .read_int_callback =    pl2303_read_int_callback,
923         .attach =               pl2303_startup,
924         .release =              pl2303_release,
925         .port_probe =           pl2303_port_probe,
926         .port_remove =          pl2303_port_remove,
927 };
928
929 static struct usb_serial_driver * const serial_drivers[] = {
930         &pl2303_device, NULL
931 };
932
933 module_usb_serial_driver(serial_drivers, id_table);
934
935 MODULE_DESCRIPTION(DRIVER_DESC);
936 MODULE_LICENSE("GPL");