USB: pl2303: Removes unneeded goto.
[linux-2.6.git] / drivers / usb / serial / pl2303.c
1 /*
2  * Prolific PL2303 USB to serial adaptor driver
3  *
4  * Copyright (C) 2001-2004 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 modify
10  *      it under the terms of the GNU General Public License as published by
11  *      the Free Software Foundation; either version 2 of the License.
12  *
13  * See Documentation/usb/usb-serial.txt for more information on using this driver
14  *
15  */
16
17 #include <linux/kernel.h>
18 #include <linux/errno.h>
19 #include <linux/init.h>
20 #include <linux/slab.h>
21 #include <linux/tty.h>
22 #include <linux/tty_driver.h>
23 #include <linux/tty_flip.h>
24 #include <linux/serial.h>
25 #include <linux/module.h>
26 #include <linux/moduleparam.h>
27 #include <linux/spinlock.h>
28 #include <asm/uaccess.h>
29 #include <linux/usb.h>
30 #include <linux/usb/serial.h>
31 #include "pl2303.h"
32
33 /*
34  * Version Information
35  */
36 #define DRIVER_DESC "Prolific PL2303 USB to serial adaptor driver"
37
38 static int debug;
39
40 #define PL2303_CLOSING_WAIT     (30*HZ)
41
42 #define PL2303_BUF_SIZE         1024
43 #define PL2303_TMP_BUF_SIZE     1024
44
45 struct pl2303_buf {
46         unsigned int    buf_size;
47         char            *buf_buf;
48         char            *buf_get;
49         char            *buf_put;
50 };
51
52 static struct usb_device_id id_table [] = {
53         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID) },
54         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) },
55         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_DCU11) },
56         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ3) },
57         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_PHAROS) },
58         { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
59         { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID) },
60         { USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) },
61         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },
62         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) },
63         { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) },
64         { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID_2080) },
65         { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) },
66         { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) },
67         { USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) },
68         { USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) },
69         { USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) },
70         { USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) },
71         { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) },
72         { USB_DEVICE(SAMSUNG_VENDOR_ID, SAMSUNG_PRODUCT_ID) },
73         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1) },
74         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65) },
75         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75) },
76         { USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) },
77         { USB_DEVICE(NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID) },
78         { USB_DEVICE(CA_42_CA42_VENDOR_ID, CA_42_CA42_PRODUCT_ID) },
79         { USB_DEVICE(SAGEM_VENDOR_ID, SAGEM_PRODUCT_ID) },
80         { USB_DEVICE(LEADTEK_VENDOR_ID, LEADTEK_9531_PRODUCT_ID) },
81         { USB_DEVICE(SPEEDDRAGON_VENDOR_ID, SPEEDDRAGON_PRODUCT_ID) },
82         { USB_DEVICE(DATAPILOT_U2_VENDOR_ID, DATAPILOT_U2_PRODUCT_ID) },
83         { USB_DEVICE(BELKIN_VENDOR_ID, BELKIN_PRODUCT_ID) },
84         { }                                     /* Terminating entry */
85 };
86
87 MODULE_DEVICE_TABLE (usb, id_table);
88
89 static struct usb_driver pl2303_driver = {
90         .name =         "pl2303",
91         .probe =        usb_serial_probe,
92         .disconnect =   usb_serial_disconnect,
93         .id_table =     id_table,
94         .no_dynamic_id =        1,
95 };
96
97 #define SET_LINE_REQUEST_TYPE           0x21
98 #define SET_LINE_REQUEST                0x20
99
100 #define SET_CONTROL_REQUEST_TYPE        0x21
101 #define SET_CONTROL_REQUEST             0x22
102 #define CONTROL_DTR                     0x01
103 #define CONTROL_RTS                     0x02
104
105 #define BREAK_REQUEST_TYPE              0x21
106 #define BREAK_REQUEST                   0x23    
107 #define BREAK_ON                        0xffff
108 #define BREAK_OFF                       0x0000
109
110 #define GET_LINE_REQUEST_TYPE           0xa1
111 #define GET_LINE_REQUEST                0x21
112
113 #define VENDOR_WRITE_REQUEST_TYPE       0x40
114 #define VENDOR_WRITE_REQUEST            0x01
115
116 #define VENDOR_READ_REQUEST_TYPE        0xc0
117 #define VENDOR_READ_REQUEST             0x01
118
119 #define UART_STATE                      0x08
120 #define UART_STATE_TRANSIENT_MASK       0x74
121 #define UART_DCD                        0x01
122 #define UART_DSR                        0x02
123 #define UART_BREAK_ERROR                0x04
124 #define UART_RING                       0x08
125 #define UART_FRAME_ERROR                0x10
126 #define UART_PARITY_ERROR               0x20
127 #define UART_OVERRUN_ERROR              0x40
128 #define UART_CTS                        0x80
129
130 /* function prototypes for a PL2303 serial converter */
131 static int pl2303_open (struct usb_serial_port *port, struct file *filp);
132 static void pl2303_close (struct usb_serial_port *port, struct file *filp);
133 static void pl2303_set_termios (struct usb_serial_port *port,
134                                 struct termios *old);
135 static int pl2303_ioctl (struct usb_serial_port *port, struct file *file,
136                          unsigned int cmd, unsigned long arg);
137 static void pl2303_read_int_callback (struct urb *urb, struct pt_regs *regs);
138 static void pl2303_read_bulk_callback (struct urb *urb, struct pt_regs *regs);
139 static void pl2303_write_bulk_callback (struct urb *urb, struct pt_regs *regs);
140 static int pl2303_write (struct usb_serial_port *port,
141                          const unsigned char *buf, int count);
142 static void pl2303_send (struct usb_serial_port *port);
143 static int pl2303_write_room(struct usb_serial_port *port);
144 static int pl2303_chars_in_buffer(struct usb_serial_port *port);
145 static void pl2303_break_ctl(struct usb_serial_port *port,int break_state);
146 static int pl2303_tiocmget (struct usb_serial_port *port, struct file *file);
147 static int pl2303_tiocmset (struct usb_serial_port *port, struct file *file,
148                             unsigned int set, unsigned int clear);
149 static int pl2303_startup (struct usb_serial *serial);
150 static void pl2303_shutdown (struct usb_serial *serial);
151 static struct pl2303_buf *pl2303_buf_alloc(unsigned int size);
152 static void pl2303_buf_free(struct pl2303_buf *pb);
153 static void pl2303_buf_clear(struct pl2303_buf *pb);
154 static unsigned int pl2303_buf_data_avail(struct pl2303_buf *pb);
155 static unsigned int pl2303_buf_space_avail(struct pl2303_buf *pb);
156 static unsigned int pl2303_buf_put(struct pl2303_buf *pb, const char *buf,
157         unsigned int count);
158 static unsigned int pl2303_buf_get(struct pl2303_buf *pb, char *buf,
159         unsigned int count);
160
161
162 /* All of the device info needed for the PL2303 SIO serial converter */
163 static struct usb_serial_driver pl2303_device = {
164         .driver = {
165                 .owner =        THIS_MODULE,
166                 .name =         "pl2303",
167         },
168         .id_table =             id_table,
169         .num_interrupt_in =     NUM_DONT_CARE,
170         .num_bulk_in =          1,
171         .num_bulk_out =         1,
172         .num_ports =            1,
173         .open =                 pl2303_open,
174         .close =                pl2303_close,
175         .write =                pl2303_write,
176         .ioctl =                pl2303_ioctl,
177         .break_ctl =            pl2303_break_ctl,
178         .set_termios =          pl2303_set_termios,
179         .tiocmget =             pl2303_tiocmget,
180         .tiocmset =             pl2303_tiocmset,
181         .read_bulk_callback =   pl2303_read_bulk_callback,
182         .read_int_callback =    pl2303_read_int_callback,
183         .write_bulk_callback =  pl2303_write_bulk_callback,
184         .write_room =           pl2303_write_room,
185         .chars_in_buffer =      pl2303_chars_in_buffer,
186         .attach =               pl2303_startup,
187         .shutdown =             pl2303_shutdown,
188 };
189
190 enum pl2303_type {
191         type_0,         /* don't know the difference between type 0 and */
192         type_1,         /* type 1, until someone from prolific tells us... */
193         HX,             /* HX version of the pl2303 chip */
194 };
195
196 struct pl2303_private {
197         spinlock_t lock;
198         struct pl2303_buf *buf;
199         int write_urb_in_use;
200         wait_queue_head_t delta_msr_wait;
201         u8 line_control;
202         u8 line_status;
203         u8 termios_initialized;
204         enum pl2303_type type;
205 };
206
207
208 static int pl2303_startup (struct usb_serial *serial)
209 {
210         struct pl2303_private *priv;
211         enum pl2303_type type = type_0;
212         int i;
213
214         if (serial->dev->descriptor.bDeviceClass == 0x02)
215                 type = type_0;
216         else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40)
217                 type = HX;
218         else if (serial->dev->descriptor.bDeviceClass == 0x00)
219                 type = type_1;
220         else if (serial->dev->descriptor.bDeviceClass == 0xFF)
221                 type = type_1;
222         dbg("device type: %d", type);
223
224         for (i = 0; i < serial->num_ports; ++i) {
225                 priv = kzalloc(sizeof(struct pl2303_private), GFP_KERNEL);
226                 if (!priv)
227                         goto cleanup;
228                 spin_lock_init(&priv->lock);
229                 priv->buf = pl2303_buf_alloc(PL2303_BUF_SIZE);
230                 if (priv->buf == NULL) {
231                         kfree(priv);
232                         goto cleanup;
233                 }
234                 init_waitqueue_head(&priv->delta_msr_wait);
235                 priv->type = type;
236                 usb_set_serial_port_data(serial->port[i], priv);
237         }
238         return 0;
239
240 cleanup:
241         for (--i; i>=0; --i) {
242                 priv = usb_get_serial_port_data(serial->port[i]);
243                 pl2303_buf_free(priv->buf);
244                 kfree(priv);
245                 usb_set_serial_port_data(serial->port[i], NULL);
246         }
247         return -ENOMEM;
248 }
249
250 static int set_control_lines (struct usb_device *dev, u8 value)
251 {
252         int retval;
253         
254         retval = usb_control_msg (dev, usb_sndctrlpipe (dev, 0),
255                                   SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
256                                   value, 0, NULL, 0, 100);
257         dbg("%s - value = %d, retval = %d", __FUNCTION__, value, retval);
258         return retval;
259 }
260
261 static int pl2303_write (struct usb_serial_port *port,  const unsigned char *buf, int count)
262 {
263         struct pl2303_private *priv = usb_get_serial_port_data(port);
264         unsigned long flags;
265
266         dbg("%s - port %d, %d bytes", __FUNCTION__, port->number, count);
267
268         if (!count)
269                 return count;
270
271         spin_lock_irqsave(&priv->lock, flags);
272         count = pl2303_buf_put(priv->buf, buf, count);
273         spin_unlock_irqrestore(&priv->lock, flags);
274
275         pl2303_send(port);
276
277         return count;
278 }
279
280 static void pl2303_send(struct usb_serial_port *port)
281 {
282         int count, result;
283         struct pl2303_private *priv = usb_get_serial_port_data(port);
284         unsigned long flags;
285
286         dbg("%s - port %d", __FUNCTION__, port->number);
287
288         spin_lock_irqsave(&priv->lock, flags);
289
290         if (priv->write_urb_in_use) {
291                 spin_unlock_irqrestore(&priv->lock, flags);
292                 return;
293         }
294
295         count = pl2303_buf_get(priv->buf, port->write_urb->transfer_buffer,
296                 port->bulk_out_size);
297
298         if (count == 0) {
299                 spin_unlock_irqrestore(&priv->lock, flags);
300                 return;
301         }
302
303         priv->write_urb_in_use = 1;
304
305         spin_unlock_irqrestore(&priv->lock, flags);
306
307         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, port->write_urb->transfer_buffer);
308
309         port->write_urb->transfer_buffer_length = count;
310         port->write_urb->dev = port->serial->dev;
311         result = usb_submit_urb (port->write_urb, GFP_ATOMIC);
312         if (result) {
313                 dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result);
314                 priv->write_urb_in_use = 0;
315                 // TODO: reschedule pl2303_send
316         }
317
318         usb_serial_port_softint(port);
319 }
320
321 static int pl2303_write_room(struct usb_serial_port *port)
322 {
323         struct pl2303_private *priv = usb_get_serial_port_data(port);
324         int room = 0;
325         unsigned long flags;
326
327         dbg("%s - port %d", __FUNCTION__, port->number);
328
329         spin_lock_irqsave(&priv->lock, flags);
330         room = pl2303_buf_space_avail(priv->buf);
331         spin_unlock_irqrestore(&priv->lock, flags);
332
333         dbg("%s - returns %d", __FUNCTION__, room);
334         return room;
335 }
336
337 static int pl2303_chars_in_buffer(struct usb_serial_port *port)
338 {
339         struct pl2303_private *priv = usb_get_serial_port_data(port);
340         int chars = 0;
341         unsigned long flags;
342
343         dbg("%s - port %d", __FUNCTION__, port->number);
344
345         spin_lock_irqsave(&priv->lock, flags);
346         chars = pl2303_buf_data_avail(priv->buf);
347         spin_unlock_irqrestore(&priv->lock, flags);
348
349         dbg("%s - returns %d", __FUNCTION__, chars);
350         return chars;
351 }
352
353 static void pl2303_set_termios (struct usb_serial_port *port, struct termios *old_termios)
354 {
355         struct usb_serial *serial = port->serial;
356         struct pl2303_private *priv = usb_get_serial_port_data(port);
357         unsigned long flags;
358         unsigned int cflag;
359         unsigned char *buf;
360         int baud;
361         int i;
362         u8 control;
363
364         dbg("%s -  port %d", __FUNCTION__, port->number);
365
366         if ((!port->tty) || (!port->tty->termios)) {
367                 dbg("%s - no tty structures", __FUNCTION__);
368                 return;
369         }
370
371         spin_lock_irqsave(&priv->lock, flags);
372         if (!priv->termios_initialized) {
373                 *(port->tty->termios) = tty_std_termios;
374                 port->tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
375                 priv->termios_initialized = 1;
376         }
377         spin_unlock_irqrestore(&priv->lock, flags);
378
379         cflag = port->tty->termios->c_cflag;
380         /* check that they really want us to change something */
381         if (old_termios) {
382                 if ((cflag == old_termios->c_cflag) &&
383                     (RELEVANT_IFLAG(port->tty->termios->c_iflag) == RELEVANT_IFLAG(old_termios->c_iflag))) {
384                     dbg("%s - nothing to change...", __FUNCTION__);
385                     return;
386                 }
387         }
388
389         buf = kzalloc (7, GFP_KERNEL);
390         if (!buf) {
391                 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
392                 return;
393         }
394         
395         i = usb_control_msg (serial->dev, usb_rcvctrlpipe (serial->dev, 0),
396                              GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
397                              0, 0, buf, 7, 100);
398         dbg ("0xa1:0x21:0:0  %d - %x %x %x %x %x %x %x", i,
399              buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
400
401
402         if (cflag & CSIZE) {
403                 switch (cflag & CSIZE) {
404                         case CS5:       buf[6] = 5;     break;
405                         case CS6:       buf[6] = 6;     break;
406                         case CS7:       buf[6] = 7;     break;
407                         default:
408                         case CS8:       buf[6] = 8;     break;
409                 }
410                 dbg("%s - data bits = %d", __FUNCTION__, buf[6]);
411         }
412
413         baud = 0;
414         switch (cflag & CBAUD) {
415                 case B0:        baud = 0;       break;
416                 case B75:       baud = 75;      break;
417                 case B150:      baud = 150;     break;
418                 case B300:      baud = 300;     break;
419                 case B600:      baud = 600;     break;
420                 case B1200:     baud = 1200;    break;
421                 case B1800:     baud = 1800;    break;
422                 case B2400:     baud = 2400;    break;
423                 case B4800:     baud = 4800;    break;
424                 case B9600:     baud = 9600;    break;
425                 case B19200:    baud = 19200;   break;
426                 case B38400:    baud = 38400;   break;
427                 case B57600:    baud = 57600;   break;
428                 case B115200:   baud = 115200;  break;
429                 case B230400:   baud = 230400;  break;
430                 case B460800:   baud = 460800;  break;
431                 default:
432                         dev_err(&port->dev, "pl2303 driver does not support the baudrate requested (fix it)\n");
433                         break;
434         }
435         dbg("%s - baud = %d", __FUNCTION__, baud);
436         if (baud) {
437                 buf[0] = baud & 0xff;
438                 buf[1] = (baud >> 8) & 0xff;
439                 buf[2] = (baud >> 16) & 0xff;
440                 buf[3] = (baud >> 24) & 0xff;
441         }
442
443         /* For reference buf[4]=0 is 1 stop bits */
444         /* For reference buf[4]=1 is 1.5 stop bits */
445         /* For reference buf[4]=2 is 2 stop bits */
446         if (cflag & CSTOPB) {
447                 buf[4] = 2;
448                 dbg("%s - stop bits = 2", __FUNCTION__);
449         } else {
450                 buf[4] = 0;
451                 dbg("%s - stop bits = 1", __FUNCTION__);
452         }
453
454         if (cflag & PARENB) {
455                 /* For reference buf[5]=0 is none parity */
456                 /* For reference buf[5]=1 is odd parity */
457                 /* For reference buf[5]=2 is even parity */
458                 /* For reference buf[5]=3 is mark parity */
459                 /* For reference buf[5]=4 is space parity */
460                 if (cflag & PARODD) {
461                         buf[5] = 1;
462                         dbg("%s - parity = odd", __FUNCTION__);
463                 } else {
464                         buf[5] = 2;
465                         dbg("%s - parity = even", __FUNCTION__);
466                 }
467         } else {
468                 buf[5] = 0;
469                 dbg("%s - parity = none", __FUNCTION__);
470         }
471
472         i = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0),
473                              SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE, 
474                              0, 0, buf, 7, 100);
475         dbg ("0x21:0x20:0:0  %d", i);
476
477         /* change control lines if we are switching to or from B0 */
478         spin_lock_irqsave(&priv->lock, flags);
479         control = priv->line_control;
480         if ((cflag & CBAUD) == B0)
481                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
482         else
483                 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
484         if (control != priv->line_control) {
485                 control = priv->line_control;
486                 spin_unlock_irqrestore(&priv->lock, flags);
487                 set_control_lines(serial->dev, control);
488         } else {
489                 spin_unlock_irqrestore(&priv->lock, flags);
490         }
491         
492         buf[0] = buf[1] = buf[2] = buf[3] = buf[4] = buf[5] = buf[6] = 0;
493
494         i = usb_control_msg (serial->dev, usb_rcvctrlpipe (serial->dev, 0),
495                              GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
496                              0, 0, buf, 7, 100);
497         dbg ("0xa1:0x21:0:0  %d - %x %x %x %x %x %x %x", i,
498              buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
499
500         if (cflag & CRTSCTS) {
501                 __u16 index;
502                 if (priv->type == HX)
503                         index = 0x61;
504                 else
505                         index = 0x41;
506                 i = usb_control_msg(serial->dev, 
507                                     usb_sndctrlpipe(serial->dev, 0),
508                                     VENDOR_WRITE_REQUEST,
509                                     VENDOR_WRITE_REQUEST_TYPE,
510                                     0x0, index, NULL, 0, 100);
511                 dbg ("0x40:0x1:0x0:0x%x  %d", index, i);
512         }
513
514         kfree (buf);
515 }
516
517 static int pl2303_open (struct usb_serial_port *port, struct file *filp)
518 {
519         struct termios tmp_termios;
520         struct usb_serial *serial = port->serial;
521         struct pl2303_private *priv = usb_get_serial_port_data(port);
522         unsigned char *buf;
523         int result;
524
525         dbg("%s -  port %d", __FUNCTION__, port->number);
526
527         if (priv->type != HX) {
528                 usb_clear_halt(serial->dev, port->write_urb->pipe);
529                 usb_clear_halt(serial->dev, port->read_urb->pipe);
530         }
531
532         buf = kmalloc(10, GFP_KERNEL);
533         if (buf==NULL)
534                 return -ENOMEM;
535
536 #define FISH(a,b,c,d)                                                           \
537         result=usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev,0),     \
538                                b, a, c, d, buf, 1, 100);                        \
539         dbg("0x%x:0x%x:0x%x:0x%x  %d - %x",a,b,c,d,result,buf[0]);
540
541 #define SOUP(a,b,c,d)                                                           \
542         result=usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev,0),     \
543                                b, a, c, d, NULL, 0, 100);                       \
544         dbg("0x%x:0x%x:0x%x:0x%x  %d",a,b,c,d,result);
545
546         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
547         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 0);
548         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
549         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0);
550         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
551         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 1);
552         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
553         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0);
554         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0, 1);
555         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 1, 0);
556
557         if (priv->type == HX) {
558                 /* HX chip */
559                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 2, 0x44);
560                 /* reset upstream data pipes */
561                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 8, 0);
562                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 9, 0);
563         } else {
564                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 2, 0x24);
565         }
566
567         kfree(buf);
568
569         /* Setup termios */
570         if (port->tty) {
571                 pl2303_set_termios (port, &tmp_termios);
572         }
573
574         //FIXME: need to assert RTS and DTR if CRTSCTS off
575
576         dbg("%s - submitting read urb", __FUNCTION__);
577         port->read_urb->dev = serial->dev;
578         result = usb_submit_urb (port->read_urb, GFP_KERNEL);
579         if (result) {
580                 dev_err(&port->dev, "%s - failed submitting read urb, error %d\n", __FUNCTION__, result);
581                 pl2303_close (port, NULL);
582                 return -EPROTO;
583         }
584
585         dbg("%s - submitting interrupt urb", __FUNCTION__);
586         port->interrupt_in_urb->dev = serial->dev;
587         result = usb_submit_urb (port->interrupt_in_urb, GFP_KERNEL);
588         if (result) {
589                 dev_err(&port->dev, "%s - failed submitting interrupt urb, error %d\n", __FUNCTION__, result);
590                 pl2303_close (port, NULL);
591                 return -EPROTO;
592         }
593         return 0;
594 }
595
596
597 static void pl2303_close (struct usb_serial_port *port, struct file *filp)
598 {
599         struct pl2303_private *priv = usb_get_serial_port_data(port);
600         unsigned long flags;
601         unsigned int c_cflag;
602         int bps;
603         long timeout;
604         wait_queue_t wait;
605
606         dbg("%s - port %d", __FUNCTION__, port->number);
607
608         /* wait for data to drain from the buffer */
609         spin_lock_irqsave(&priv->lock, flags);
610         timeout = PL2303_CLOSING_WAIT;
611         init_waitqueue_entry(&wait, current);
612         add_wait_queue(&port->tty->write_wait, &wait);
613         for (;;) {
614                 set_current_state(TASK_INTERRUPTIBLE);
615                 if (pl2303_buf_data_avail(priv->buf) == 0
616                 || timeout == 0 || signal_pending(current)
617                 || !usb_get_intfdata(port->serial->interface))  /* disconnect */
618                         break;
619                 spin_unlock_irqrestore(&priv->lock, flags);
620                 timeout = schedule_timeout(timeout);
621                 spin_lock_irqsave(&priv->lock, flags);
622         }
623         set_current_state(TASK_RUNNING);
624         remove_wait_queue(&port->tty->write_wait, &wait);
625         /* clear out any remaining data in the buffer */
626         pl2303_buf_clear(priv->buf);
627         spin_unlock_irqrestore(&priv->lock, flags);
628
629         /* wait for characters to drain from the device */
630         /* (this is long enough for the entire 256 byte */
631         /* pl2303 hardware buffer to drain with no flow */
632         /* control for data rates of 1200 bps or more, */
633         /* for lower rates we should really know how much */
634         /* data is in the buffer to compute a delay */
635         /* that is not unnecessarily long) */
636         bps = tty_get_baud_rate(port->tty);
637         if (bps > 1200)
638                 timeout = max((HZ*2560)/bps,HZ/10);
639         else
640                 timeout = 2*HZ;
641         schedule_timeout_interruptible(timeout);
642
643         /* shutdown our urbs */
644         dbg("%s - shutting down urbs", __FUNCTION__);
645         usb_kill_urb(port->write_urb);
646         usb_kill_urb(port->read_urb);
647         usb_kill_urb(port->interrupt_in_urb);
648
649         if (port->tty) {
650                 c_cflag = port->tty->termios->c_cflag;
651                 if (c_cflag & HUPCL) {
652                         /* drop DTR and RTS */
653                         spin_lock_irqsave(&priv->lock, flags);
654                         priv->line_control = 0;
655                         spin_unlock_irqrestore (&priv->lock, flags);
656                         set_control_lines (port->serial->dev, 0);
657                 }
658         }
659 }
660
661 static int pl2303_tiocmset (struct usb_serial_port *port, struct file *file,
662                             unsigned int set, unsigned int clear)
663 {
664         struct pl2303_private *priv = usb_get_serial_port_data(port);
665         unsigned long flags;
666         u8 control;
667
668         if (!usb_get_intfdata(port->serial->interface))
669                 return -ENODEV;
670
671         spin_lock_irqsave (&priv->lock, flags);
672         if (set & TIOCM_RTS)
673                 priv->line_control |= CONTROL_RTS;
674         if (set & TIOCM_DTR)
675                 priv->line_control |= CONTROL_DTR;
676         if (clear & TIOCM_RTS)
677                 priv->line_control &= ~CONTROL_RTS;
678         if (clear & TIOCM_DTR)
679                 priv->line_control &= ~CONTROL_DTR;
680         control = priv->line_control;
681         spin_unlock_irqrestore (&priv->lock, flags);
682
683         return set_control_lines (port->serial->dev, control);
684 }
685
686 static int pl2303_tiocmget (struct usb_serial_port *port, struct file *file)
687 {
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         dbg("%s (%d)", __FUNCTION__, port->number);
695
696         if (!usb_get_intfdata(port->serial->interface))
697                 return -ENODEV;
698
699         spin_lock_irqsave (&priv->lock, flags);
700         mcr = priv->line_control;
701         status = priv->line_status;
702         spin_unlock_irqrestore (&priv->lock, flags);
703
704         result = ((mcr & CONTROL_DTR)           ? TIOCM_DTR : 0)
705                   | ((mcr & CONTROL_RTS)        ? TIOCM_RTS : 0)
706                   | ((status & UART_CTS)        ? TIOCM_CTS : 0)
707                   | ((status & UART_DSR)        ? TIOCM_DSR : 0)
708                   | ((status & UART_RING)       ? TIOCM_RI  : 0)
709                   | ((status & UART_DCD)        ? TIOCM_CD  : 0);
710
711         dbg("%s - result = %x", __FUNCTION__, result);
712
713         return result;
714 }
715
716 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
717 {
718         struct pl2303_private *priv = usb_get_serial_port_data(port);
719         unsigned long flags;
720         unsigned int prevstatus;
721         unsigned int status;
722         unsigned int changed;
723
724         spin_lock_irqsave (&priv->lock, flags);
725         prevstatus = priv->line_status;
726         spin_unlock_irqrestore (&priv->lock, flags);
727
728         while (1) {
729                 interruptible_sleep_on(&priv->delta_msr_wait);
730                 /* see if a signal did it */
731                 if (signal_pending(current))
732                         return -ERESTARTSYS;
733                 
734                 spin_lock_irqsave (&priv->lock, flags);
735                 status = priv->line_status;
736                 spin_unlock_irqrestore (&priv->lock, flags);
737                 
738                 changed=prevstatus^status;
739                 
740                 if (((arg & TIOCM_RNG) && (changed & UART_RING)) ||
741                     ((arg & TIOCM_DSR) && (changed & UART_DSR)) ||
742                     ((arg & TIOCM_CD)  && (changed & UART_DCD)) ||
743                     ((arg & TIOCM_CTS) && (changed & UART_CTS)) ) {
744                         return 0;
745                 }
746                 prevstatus = status;
747         }
748         /* NOTREACHED */
749         return 0;
750 }
751
752 static int pl2303_ioctl (struct usb_serial_port *port, struct file *file, unsigned int cmd, unsigned long arg)
753 {
754         dbg("%s (%d) cmd = 0x%04x", __FUNCTION__, port->number, cmd);
755
756         switch (cmd) {
757                 case TIOCMIWAIT:
758                         dbg("%s (%d) TIOCMIWAIT", __FUNCTION__,  port->number);
759                         return wait_modem_info(port, arg);
760
761                 default:
762                         dbg("%s not supported = 0x%04x", __FUNCTION__, cmd);
763                         break;
764         }
765
766         return -ENOIOCTLCMD;
767 }
768
769 static void pl2303_break_ctl (struct usb_serial_port *port, int break_state)
770 {
771         struct usb_serial *serial = port->serial;
772         u16 state;
773         int result;
774
775         dbg("%s - port %d", __FUNCTION__, port->number);
776
777         if (break_state == 0)
778                 state = BREAK_OFF;
779         else
780                 state = BREAK_ON;
781         dbg("%s - turning break %s", __FUNCTION__, state==BREAK_OFF ? "off" : "on");
782
783         result = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0),
784                                   BREAK_REQUEST, BREAK_REQUEST_TYPE, state, 
785                                   0, NULL, 0, 100);
786         if (result)
787                 dbg("%s - error sending break = %d", __FUNCTION__, result);
788 }
789
790
791 static void pl2303_shutdown (struct usb_serial *serial)
792 {
793         int i;
794         struct pl2303_private *priv;
795
796         dbg("%s", __FUNCTION__);
797
798         for (i = 0; i < serial->num_ports; ++i) {
799                 priv = usb_get_serial_port_data(serial->port[i]);
800                 if (priv) {
801                         pl2303_buf_free(priv->buf);
802                         kfree(priv);
803                         usb_set_serial_port_data(serial->port[i], NULL);
804                 }
805         }               
806 }
807
808 static void pl2303_update_line_status(struct usb_serial_port *port,
809                                       unsigned char *data,
810                                       unsigned int actual_length)
811 {
812
813         struct pl2303_private *priv = usb_get_serial_port_data(port);
814         unsigned long flags;
815         u8 status_idx = UART_STATE;
816         u8 length = UART_STATE + 1;
817
818         if ((le16_to_cpu(port->serial->dev->descriptor.idVendor) == SIEMENS_VENDOR_ID) &&
819             (le16_to_cpu(port->serial->dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_X65 ||
820              le16_to_cpu(port->serial->dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_SX1 ||
821              le16_to_cpu(port->serial->dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_X75)) {
822                 length = 1;
823                 status_idx = 0;
824         }
825
826         if (actual_length < length)
827                 return;
828
829         /* Save off the uart status for others to look at */
830         spin_lock_irqsave(&priv->lock, flags);
831         priv->line_status = data[status_idx];
832         spin_unlock_irqrestore(&priv->lock, flags);
833         wake_up_interruptible (&priv->delta_msr_wait);
834 }
835
836 static void pl2303_read_int_callback (struct urb *urb, struct pt_regs *regs)
837 {
838         struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
839         unsigned char *data = urb->transfer_buffer;
840         unsigned int actual_length = urb->actual_length;
841         int status;
842
843         dbg("%s (%d)", __FUNCTION__, port->number);
844
845         switch (urb->status) {
846         case 0:
847                 /* success */
848                 break;
849         case -ECONNRESET:
850         case -ENOENT:
851         case -ESHUTDOWN:
852                 /* this urb is terminated, clean up */
853                 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
854                 return;
855         default:
856                 dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
857                 goto exit;
858         }
859
860         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, urb->transfer_buffer);
861         pl2303_update_line_status(port, data, actual_length);
862
863 exit:
864         status = usb_submit_urb (urb, GFP_ATOMIC);
865         if (status)
866                 dev_err(&urb->dev->dev, "%s - usb_submit_urb failed with result %d\n",
867                         __FUNCTION__, status);
868 }
869
870
871 static void pl2303_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
872 {
873         struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
874         struct pl2303_private *priv = usb_get_serial_port_data(port);
875         struct tty_struct *tty;
876         unsigned char *data = urb->transfer_buffer;
877         unsigned long flags;
878         int i;
879         int result;
880         u8 status;
881         char tty_flag;
882
883         dbg("%s - port %d", __FUNCTION__, port->number);
884
885         if (urb->status) {
886                 dbg("%s - urb->status = %d", __FUNCTION__, urb->status);
887                 if (!port->open_count) {
888                         dbg("%s - port is closed, exiting.", __FUNCTION__);
889                         return;
890                 }
891                 if (urb->status == -EPROTO) {
892                         /* PL2303 mysteriously fails with -EPROTO reschedule the read */
893                         dbg("%s - caught -EPROTO, resubmitting the urb", __FUNCTION__);
894                         urb->status = 0;
895                         urb->dev = port->serial->dev;
896                         result = usb_submit_urb(urb, GFP_ATOMIC);
897                         if (result)
898                                 dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
899                         return;
900                 }
901                 dbg("%s - unable to handle the error, exiting.", __FUNCTION__);
902                 return;
903         }
904
905         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
906
907         /* get tty_flag from status */
908         tty_flag = TTY_NORMAL;
909
910         spin_lock_irqsave(&priv->lock, flags);
911         status = priv->line_status;
912         priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
913         spin_unlock_irqrestore(&priv->lock, flags);
914         wake_up_interruptible (&priv->delta_msr_wait);
915
916         /* break takes precedence over parity, */
917         /* which takes precedence over framing errors */
918         if (status & UART_BREAK_ERROR )
919                 tty_flag = TTY_BREAK;
920         else if (status & UART_PARITY_ERROR)
921                 tty_flag = TTY_PARITY;
922         else if (status & UART_FRAME_ERROR)
923                 tty_flag = TTY_FRAME;
924         dbg("%s - tty_flag = %d", __FUNCTION__, tty_flag);
925
926         tty = port->tty;
927         if (tty && urb->actual_length) {
928                 tty_buffer_request_room(tty, urb->actual_length + 1);
929                 /* overrun is special, not associated with a char */
930                 if (status & UART_OVERRUN_ERROR)
931                         tty_insert_flip_char(tty, 0, TTY_OVERRUN);
932                 for (i = 0; i < urb->actual_length; ++i)
933                         tty_insert_flip_char (tty, data[i], tty_flag);
934                 tty_flip_buffer_push (tty);
935         }
936
937         /* Schedule the next read _if_ we are still open */
938         if (port->open_count) {
939                 urb->dev = port->serial->dev;
940                 result = usb_submit_urb(urb, GFP_ATOMIC);
941                 if (result)
942                         dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
943         }
944
945         return;
946 }
947
948
949
950 static void pl2303_write_bulk_callback (struct urb *urb, struct pt_regs *regs)
951 {
952         struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
953         struct pl2303_private *priv = usb_get_serial_port_data(port);
954         int result;
955
956         dbg("%s - port %d", __FUNCTION__, port->number);
957
958         switch (urb->status) {
959         case 0:
960                 /* success */
961                 break;
962         case -ECONNRESET:
963         case -ENOENT:
964         case -ESHUTDOWN:
965                 /* this urb is terminated, clean up */
966                 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
967                 priv->write_urb_in_use = 0;
968                 return;
969         default:
970                 /* error in the urb, so we have to resubmit it */
971                 dbg("%s - Overflow in write", __FUNCTION__);
972                 dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
973                 port->write_urb->transfer_buffer_length = 1;
974                 port->write_urb->dev = port->serial->dev;
975                 result = usb_submit_urb (port->write_urb, GFP_ATOMIC);
976                 if (result)
977                         dev_err(&urb->dev->dev, "%s - failed resubmitting write urb, error %d\n", __FUNCTION__, result);
978                 else
979                         return;
980         }
981
982         priv->write_urb_in_use = 0;
983
984         /* send any buffered data */
985         pl2303_send(port);
986 }
987
988
989 /*
990  * pl2303_buf_alloc
991  *
992  * Allocate a circular buffer and all associated memory.
993  */
994
995 static struct pl2303_buf *pl2303_buf_alloc(unsigned int size)
996 {
997
998         struct pl2303_buf *pb;
999
1000
1001         if (size == 0)
1002                 return NULL;
1003
1004         pb = (struct pl2303_buf *)kmalloc(sizeof(struct pl2303_buf), GFP_KERNEL);
1005         if (pb == NULL)
1006                 return NULL;
1007
1008         pb->buf_buf = kmalloc(size, GFP_KERNEL);
1009         if (pb->buf_buf == NULL) {
1010                 kfree(pb);
1011                 return NULL;
1012         }
1013
1014         pb->buf_size = size;
1015         pb->buf_get = pb->buf_put = pb->buf_buf;
1016
1017         return pb;
1018
1019 }
1020
1021
1022 /*
1023  * pl2303_buf_free
1024  *
1025  * Free the buffer and all associated memory.
1026  */
1027
1028 static void pl2303_buf_free(struct pl2303_buf *pb)
1029 {
1030         if (pb) {
1031                 kfree(pb->buf_buf);
1032                 kfree(pb);
1033         }
1034 }
1035
1036
1037 /*
1038  * pl2303_buf_clear
1039  *
1040  * Clear out all data in the circular buffer.
1041  */
1042
1043 static void pl2303_buf_clear(struct pl2303_buf *pb)
1044 {
1045         if (pb != NULL)
1046                 pb->buf_get = pb->buf_put;
1047                 /* equivalent to a get of all data available */
1048 }
1049
1050
1051 /*
1052  * pl2303_buf_data_avail
1053  *
1054  * Return the number of bytes of data available in the circular
1055  * buffer.
1056  */
1057
1058 static unsigned int pl2303_buf_data_avail(struct pl2303_buf *pb)
1059 {
1060         if (pb != NULL)
1061                 return ((pb->buf_size + pb->buf_put - pb->buf_get) % pb->buf_size);
1062         else
1063                 return 0;
1064 }
1065
1066
1067 /*
1068  * pl2303_buf_space_avail
1069  *
1070  * Return the number of bytes of space available in the circular
1071  * buffer.
1072  */
1073
1074 static unsigned int pl2303_buf_space_avail(struct pl2303_buf *pb)
1075 {
1076         if (pb != NULL)
1077                 return ((pb->buf_size + pb->buf_get - pb->buf_put - 1) % pb->buf_size);
1078         else
1079                 return 0;
1080 }
1081
1082
1083 /*
1084  * pl2303_buf_put
1085  *
1086  * Copy data data from a user buffer and put it into the circular buffer.
1087  * Restrict to the amount of space available.
1088  *
1089  * Return the number of bytes copied.
1090  */
1091
1092 static unsigned int pl2303_buf_put(struct pl2303_buf *pb, const char *buf,
1093         unsigned int count)
1094 {
1095
1096         unsigned int len;
1097
1098
1099         if (pb == NULL)
1100                 return 0;
1101
1102         len  = pl2303_buf_space_avail(pb);
1103         if (count > len)
1104                 count = len;
1105
1106         if (count == 0)
1107                 return 0;
1108
1109         len = pb->buf_buf + pb->buf_size - pb->buf_put;
1110         if (count > len) {
1111                 memcpy(pb->buf_put, buf, len);
1112                 memcpy(pb->buf_buf, buf+len, count - len);
1113                 pb->buf_put = pb->buf_buf + count - len;
1114         } else {
1115                 memcpy(pb->buf_put, buf, count);
1116                 if (count < len)
1117                         pb->buf_put += count;
1118                 else /* count == len */
1119                         pb->buf_put = pb->buf_buf;
1120         }
1121
1122         return count;
1123
1124 }
1125
1126
1127 /*
1128  * pl2303_buf_get
1129  *
1130  * Get data from the circular buffer and copy to the given buffer.
1131  * Restrict to the amount of data available.
1132  *
1133  * Return the number of bytes copied.
1134  */
1135
1136 static unsigned int pl2303_buf_get(struct pl2303_buf *pb, char *buf,
1137         unsigned int count)
1138 {
1139
1140         unsigned int len;
1141
1142
1143         if (pb == NULL)
1144                 return 0;
1145
1146         len = pl2303_buf_data_avail(pb);
1147         if (count > len)
1148                 count = len;
1149
1150         if (count == 0)
1151                 return 0;
1152
1153         len = pb->buf_buf + pb->buf_size - pb->buf_get;
1154         if (count > len) {
1155                 memcpy(buf, pb->buf_get, len);
1156                 memcpy(buf+len, pb->buf_buf, count - len);
1157                 pb->buf_get = pb->buf_buf + count - len;
1158         } else {
1159                 memcpy(buf, pb->buf_get, count);
1160                 if (count < len)
1161                         pb->buf_get += count;
1162                 else /* count == len */
1163                         pb->buf_get = pb->buf_buf;
1164         }
1165
1166         return count;
1167
1168 }
1169
1170 static int __init pl2303_init (void)
1171 {
1172         int retval;
1173         retval = usb_serial_register(&pl2303_device);
1174         if (retval)
1175                 goto failed_usb_serial_register;
1176         retval = usb_register(&pl2303_driver);
1177         if (retval)
1178                 goto failed_usb_register;
1179         info(DRIVER_DESC);
1180         return 0;
1181 failed_usb_register:
1182         usb_serial_deregister(&pl2303_device);
1183 failed_usb_serial_register:
1184         return retval;
1185 }
1186
1187
1188 static void __exit pl2303_exit (void)
1189 {
1190         usb_deregister (&pl2303_driver);
1191         usb_serial_deregister (&pl2303_device);
1192 }
1193
1194
1195 module_init(pl2303_init);
1196 module_exit(pl2303_exit);
1197
1198 MODULE_DESCRIPTION(DRIVER_DESC);
1199 MODULE_LICENSE("GPL");
1200
1201 module_param(debug, bool, S_IRUGO | S_IWUSR);
1202 MODULE_PARM_DESC(debug, "Debug enabled or not");
1203