[PATCH] pl2303 - status line
[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, or
12  *      (at your option) any later version.
13  *
14  * See Documentation/usb/usb-serial.txt for more information on using this driver
15  *
16  * 2002_Mar_26 gkh
17  *      allowed driver to work properly if there is no tty assigned to a port
18  *      (this happens for serial console devices.)
19  *
20  * 2001_Oct_06 gkh
21  *      Added RTS and DTR line control.  Thanks to joe@bndlg.de for parts of it.
22  *
23  * 2001_Sep_19 gkh
24  *      Added break support.
25  *
26  * 2001_Aug_30 gkh
27  *      fixed oops in write_bulk_callback.
28  *
29  * 2001_Aug_28 gkh
30  *      reworked buffer logic to be like other usb-serial drivers.  Hopefully
31  *      removing some reported problems.
32  *
33  * 2001_Jun_06 gkh
34  *      finished porting to 2.4 format.
35  * 
36  */
37
38 #include <linux/config.h>
39 #include <linux/kernel.h>
40 #include <linux/errno.h>
41 #include <linux/init.h>
42 #include <linux/slab.h>
43 #include <linux/tty.h>
44 #include <linux/tty_driver.h>
45 #include <linux/tty_flip.h>
46 #include <linux/serial.h>
47 #include <linux/module.h>
48 #include <linux/moduleparam.h>
49 #include <linux/spinlock.h>
50 #include <asm/uaccess.h>
51 #include <linux/usb.h>
52 #include "usb-serial.h"
53 #include "pl2303.h"
54
55 /*
56  * Version Information
57  */
58 #define DRIVER_VERSION "v0.12"
59 #define DRIVER_DESC "Prolific PL2303 USB to serial adaptor driver"
60
61 static int debug;
62
63 #define PL2303_CLOSING_WAIT     (30*HZ)
64
65 #define PL2303_BUF_SIZE         1024
66 #define PL2303_TMP_BUF_SIZE     1024
67
68 static DECLARE_MUTEX(pl2303_tmp_buf_sem);
69
70 struct pl2303_buf {
71         unsigned int    buf_size;
72         char            *buf_buf;
73         char            *buf_get;
74         char            *buf_put;
75 };
76
77 static struct usb_device_id id_table [] = {
78         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID) },
79         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) },
80         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ3) },
81         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_PHAROS) },
82         { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
83         { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID) },
84         { USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) },
85         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },
86         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) },
87         { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) },
88         { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) },
89         { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) },
90         { USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) },
91         { USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) },
92         { USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) },
93         { USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) },
94         { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) },
95         { USB_DEVICE(SAMSUNG_VENDOR_ID, SAMSUNG_PRODUCT_ID) },
96         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65) },
97         { }                                     /* Terminating entry */
98 };
99
100 MODULE_DEVICE_TABLE (usb, id_table);
101
102 static struct usb_driver pl2303_driver = {
103         .owner =        THIS_MODULE,
104         .name =         "pl2303",
105         .probe =        usb_serial_probe,
106         .disconnect =   usb_serial_disconnect,
107         .id_table =     id_table,
108 };
109
110 #define SET_LINE_REQUEST_TYPE           0x21
111 #define SET_LINE_REQUEST                0x20
112
113 #define SET_CONTROL_REQUEST_TYPE        0x21
114 #define SET_CONTROL_REQUEST             0x22
115 #define CONTROL_DTR                     0x01
116 #define CONTROL_RTS                     0x02
117
118 #define BREAK_REQUEST_TYPE              0x21
119 #define BREAK_REQUEST                   0x23    
120 #define BREAK_ON                        0xffff
121 #define BREAK_OFF                       0x0000
122
123 #define GET_LINE_REQUEST_TYPE           0xa1
124 #define GET_LINE_REQUEST                0x21
125
126 #define VENDOR_WRITE_REQUEST_TYPE       0x40
127 #define VENDOR_WRITE_REQUEST            0x01
128
129 #define VENDOR_READ_REQUEST_TYPE        0xc0
130 #define VENDOR_READ_REQUEST             0x01
131
132 #define UART_STATE                      0x08
133 #define UART_STATE_TRANSIENT_MASK       0x74
134 #define UART_DCD                        0x01
135 #define UART_DSR                        0x02
136 #define UART_BREAK_ERROR                0x04
137 #define UART_RING                       0x08
138 #define UART_FRAME_ERROR                0x10
139 #define UART_PARITY_ERROR               0x20
140 #define UART_OVERRUN_ERROR              0x40
141 #define UART_CTS                        0x80
142
143 /* function prototypes for a PL2303 serial converter */
144 static int pl2303_open (struct usb_serial_port *port, struct file *filp);
145 static void pl2303_close (struct usb_serial_port *port, struct file *filp);
146 static void pl2303_set_termios (struct usb_serial_port *port,
147                                 struct termios *old);
148 static int pl2303_ioctl (struct usb_serial_port *port, struct file *file,
149                          unsigned int cmd, unsigned long arg);
150 static void pl2303_read_int_callback (struct urb *urb, struct pt_regs *regs);
151 static void pl2303_read_bulk_callback (struct urb *urb, struct pt_regs *regs);
152 static void pl2303_write_bulk_callback (struct urb *urb, struct pt_regs *regs);
153 static int pl2303_write (struct usb_serial_port *port,
154                          const unsigned char *buf, int count);
155 static void pl2303_send (struct usb_serial_port *port);
156 static int pl2303_write_room(struct usb_serial_port *port);
157 static int pl2303_chars_in_buffer(struct usb_serial_port *port);
158 static void pl2303_break_ctl(struct usb_serial_port *port,int break_state);
159 static int pl2303_tiocmget (struct usb_serial_port *port, struct file *file);
160 static int pl2303_tiocmset (struct usb_serial_port *port, struct file *file,
161                             unsigned int set, unsigned int clear);
162 static int pl2303_startup (struct usb_serial *serial);
163 static void pl2303_shutdown (struct usb_serial *serial);
164 static struct pl2303_buf *pl2303_buf_alloc(unsigned int size);
165 static void pl2303_buf_free(struct pl2303_buf *pb);
166 static void pl2303_buf_clear(struct pl2303_buf *pb);
167 static unsigned int pl2303_buf_data_avail(struct pl2303_buf *pb);
168 static unsigned int pl2303_buf_space_avail(struct pl2303_buf *pb);
169 static unsigned int pl2303_buf_put(struct pl2303_buf *pb, const char *buf,
170         unsigned int count);
171 static unsigned int pl2303_buf_get(struct pl2303_buf *pb, char *buf,
172         unsigned int count);
173
174
175 /* All of the device info needed for the PL2303 SIO serial converter */
176 static struct usb_serial_device_type pl2303_device = {
177         .owner =                THIS_MODULE,
178         .name =                 "PL-2303",
179         .id_table =             id_table,
180         .num_interrupt_in =     NUM_DONT_CARE,
181         .num_bulk_in =          1,
182         .num_bulk_out =         1,
183         .num_ports =            1,
184         .open =                 pl2303_open,
185         .close =                pl2303_close,
186         .write =                pl2303_write,
187         .ioctl =                pl2303_ioctl,
188         .break_ctl =            pl2303_break_ctl,
189         .set_termios =          pl2303_set_termios,
190         .tiocmget =             pl2303_tiocmget,
191         .tiocmset =             pl2303_tiocmset,
192         .read_bulk_callback =   pl2303_read_bulk_callback,
193         .read_int_callback =    pl2303_read_int_callback,
194         .write_bulk_callback =  pl2303_write_bulk_callback,
195         .write_room =           pl2303_write_room,
196         .chars_in_buffer =      pl2303_chars_in_buffer,
197         .attach =               pl2303_startup,
198         .shutdown =             pl2303_shutdown,
199 };
200
201 enum pl2303_type {
202         type_0,         /* don't know the difference between type 0 and */
203         type_1,         /* type 1, until someone from prolific tells us... */
204         HX,             /* HX version of the pl2303 chip */
205 };
206
207 struct pl2303_private {
208         spinlock_t lock;
209         struct pl2303_buf *buf;
210         int write_urb_in_use;
211         wait_queue_head_t delta_msr_wait;
212         u8 line_control;
213         u8 line_status;
214         u8 termios_initialized;
215         enum pl2303_type type;
216 };
217
218
219 static int pl2303_startup (struct usb_serial *serial)
220 {
221         struct pl2303_private *priv;
222         enum pl2303_type type = type_0;
223         int i;
224
225         if (serial->dev->descriptor.bDeviceClass == 0x02)
226                 type = type_0;
227         else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40)
228                 type = HX;
229         else if (serial->dev->descriptor.bDeviceClass == 0x00)
230                 type = type_1;
231         else if (serial->dev->descriptor.bDeviceClass == 0xFF)
232                 type = type_1;
233         dbg("device type: %d", type);
234
235         for (i = 0; i < serial->num_ports; ++i) {
236                 priv = kmalloc (sizeof (struct pl2303_private), GFP_KERNEL);
237                 if (!priv)
238                         goto cleanup;
239                 memset (priv, 0x00, sizeof (struct pl2303_private));
240                 spin_lock_init(&priv->lock);
241                 priv->buf = pl2303_buf_alloc(PL2303_BUF_SIZE);
242                 if (priv->buf == NULL) {
243                         kfree(priv);
244                         goto cleanup;
245                 }
246                 init_waitqueue_head(&priv->delta_msr_wait);
247                 priv->type = type;
248                 usb_set_serial_port_data(serial->port[i], priv);
249         }
250         return 0;
251
252 cleanup:
253         for (--i; i>=0; --i) {
254                 priv = usb_get_serial_port_data(serial->port[i]);
255                 pl2303_buf_free(priv->buf);
256                 kfree(priv);
257                 usb_set_serial_port_data(serial->port[i], NULL);
258         }
259         return -ENOMEM;
260 }
261
262 static int set_control_lines (struct usb_device *dev, u8 value)
263 {
264         int retval;
265         
266         retval = usb_control_msg (dev, usb_sndctrlpipe (dev, 0),
267                                   SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
268                                   value, 0, NULL, 0, 100);
269         dbg("%s - value = %d, retval = %d", __FUNCTION__, value, retval);
270         return retval;
271 }
272
273 static int pl2303_write (struct usb_serial_port *port,  const unsigned char *buf, int count)
274 {
275         struct pl2303_private *priv = usb_get_serial_port_data(port);
276         unsigned long flags;
277
278         dbg("%s - port %d, %d bytes", __FUNCTION__, port->number, count);
279
280         if (!count)
281                 return count;
282
283         spin_lock_irqsave(&priv->lock, flags);
284         count = pl2303_buf_put(priv->buf, buf, count);
285         spin_unlock_irqrestore(&priv->lock, flags);
286
287         pl2303_send(port);
288
289         return count;
290 }
291
292 static void pl2303_send(struct usb_serial_port *port)
293 {
294         int count, result;
295         struct pl2303_private *priv = usb_get_serial_port_data(port);
296         unsigned long flags;
297
298         dbg("%s - port %d", __FUNCTION__, port->number);
299
300         spin_lock_irqsave(&priv->lock, flags);
301
302         if (priv->write_urb_in_use) {
303                 spin_unlock_irqrestore(&priv->lock, flags);
304                 return;
305         }
306
307         count = pl2303_buf_get(priv->buf, port->write_urb->transfer_buffer,
308                 port->bulk_out_size);
309
310         if (count == 0) {
311                 spin_unlock_irqrestore(&priv->lock, flags);
312                 return;
313         }
314
315         priv->write_urb_in_use = 1;
316
317         spin_unlock_irqrestore(&priv->lock, flags);
318
319         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, port->write_urb->transfer_buffer);
320
321         port->write_urb->transfer_buffer_length = count;
322         port->write_urb->dev = port->serial->dev;
323         result = usb_submit_urb (port->write_urb, GFP_ATOMIC);
324         if (result) {
325                 dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result);
326                 priv->write_urb_in_use = 0;
327                 // TODO: reschedule pl2303_send
328         }
329
330         schedule_work(&port->work);
331 }
332
333 static int pl2303_write_room(struct usb_serial_port *port)
334 {
335         struct pl2303_private *priv = usb_get_serial_port_data(port);
336         int room = 0;
337         unsigned long flags;
338
339         dbg("%s - port %d", __FUNCTION__, port->number);
340
341         spin_lock_irqsave(&priv->lock, flags);
342         room = pl2303_buf_space_avail(priv->buf);
343         spin_unlock_irqrestore(&priv->lock, flags);
344
345         dbg("%s - returns %d", __FUNCTION__, room);
346         return room;
347 }
348
349 static int pl2303_chars_in_buffer(struct usb_serial_port *port)
350 {
351         struct pl2303_private *priv = usb_get_serial_port_data(port);
352         int chars = 0;
353         unsigned long flags;
354
355         dbg("%s - port %d", __FUNCTION__, port->number);
356
357         spin_lock_irqsave(&priv->lock, flags);
358         chars = pl2303_buf_data_avail(priv->buf);
359         spin_unlock_irqrestore(&priv->lock, flags);
360
361         dbg("%s - returns %d", __FUNCTION__, chars);
362         return chars;
363 }
364
365 static void pl2303_set_termios (struct usb_serial_port *port, struct termios *old_termios)
366 {
367         struct usb_serial *serial = port->serial;
368         struct pl2303_private *priv = usb_get_serial_port_data(port);
369         unsigned long flags;
370         unsigned int cflag;
371         unsigned char *buf;
372         int baud;
373         int i;
374         u8 control;
375
376         dbg("%s -  port %d", __FUNCTION__, port->number);
377
378         if ((!port->tty) || (!port->tty->termios)) {
379                 dbg("%s - no tty structures", __FUNCTION__);
380                 return;
381         }
382
383         spin_lock_irqsave(&priv->lock, flags);
384         if (!priv->termios_initialized) {
385                 *(port->tty->termios) = tty_std_termios;
386                 port->tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
387                 priv->termios_initialized = 1;
388         }
389         spin_unlock_irqrestore(&priv->lock, flags);
390
391         cflag = port->tty->termios->c_cflag;
392         /* check that they really want us to change something */
393         if (old_termios) {
394                 if ((cflag == old_termios->c_cflag) &&
395                     (RELEVANT_IFLAG(port->tty->termios->c_iflag) == RELEVANT_IFLAG(old_termios->c_iflag))) {
396                     dbg("%s - nothing to change...", __FUNCTION__);
397                     return;
398                 }
399         }
400
401         buf = kmalloc (7, GFP_KERNEL);
402         if (!buf) {
403                 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
404                 return;
405         }
406         memset (buf, 0x00, 0x07);
407         
408         i = usb_control_msg (serial->dev, usb_rcvctrlpipe (serial->dev, 0),
409                              GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
410                              0, 0, buf, 7, 100);
411         dbg ("0xa1:0x21:0:0  %d - %x %x %x %x %x %x %x", i,
412              buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
413
414
415         if (cflag & CSIZE) {
416                 switch (cflag & CSIZE) {
417                         case CS5:       buf[6] = 5;     break;
418                         case CS6:       buf[6] = 6;     break;
419                         case CS7:       buf[6] = 7;     break;
420                         default:
421                         case CS8:       buf[6] = 8;     break;
422                 }
423                 dbg("%s - data bits = %d", __FUNCTION__, buf[6]);
424         }
425
426         baud = 0;
427         switch (cflag & CBAUD) {
428                 case B0:        baud = 0;       break;
429                 case B75:       baud = 75;      break;
430                 case B150:      baud = 150;     break;
431                 case B300:      baud = 300;     break;
432                 case B600:      baud = 600;     break;
433                 case B1200:     baud = 1200;    break;
434                 case B1800:     baud = 1800;    break;
435                 case B2400:     baud = 2400;    break;
436                 case B4800:     baud = 4800;    break;
437                 case B9600:     baud = 9600;    break;
438                 case B19200:    baud = 19200;   break;
439                 case B38400:    baud = 38400;   break;
440                 case B57600:    baud = 57600;   break;
441                 case B115200:   baud = 115200;  break;
442                 case B230400:   baud = 230400;  break;
443                 case B460800:   baud = 460800;  break;
444                 default:
445                         dev_err(&port->dev, "pl2303 driver does not support the baudrate requested (fix it)\n");
446                         break;
447         }
448         dbg("%s - baud = %d", __FUNCTION__, baud);
449         if (baud) {
450                 buf[0] = baud & 0xff;
451                 buf[1] = (baud >> 8) & 0xff;
452                 buf[2] = (baud >> 16) & 0xff;
453                 buf[3] = (baud >> 24) & 0xff;
454         }
455
456         /* For reference buf[4]=0 is 1 stop bits */
457         /* For reference buf[4]=1 is 1.5 stop bits */
458         /* For reference buf[4]=2 is 2 stop bits */
459         if (cflag & CSTOPB) {
460                 buf[4] = 2;
461                 dbg("%s - stop bits = 2", __FUNCTION__);
462         } else {
463                 buf[4] = 0;
464                 dbg("%s - stop bits = 1", __FUNCTION__);
465         }
466
467         if (cflag & PARENB) {
468                 /* For reference buf[5]=0 is none parity */
469                 /* For reference buf[5]=1 is odd parity */
470                 /* For reference buf[5]=2 is even parity */
471                 /* For reference buf[5]=3 is mark parity */
472                 /* For reference buf[5]=4 is space parity */
473                 if (cflag & PARODD) {
474                         buf[5] = 1;
475                         dbg("%s - parity = odd", __FUNCTION__);
476                 } else {
477                         buf[5] = 2;
478                         dbg("%s - parity = even", __FUNCTION__);
479                 }
480         } else {
481                 buf[5] = 0;
482                 dbg("%s - parity = none", __FUNCTION__);
483         }
484
485         i = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0),
486                              SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE, 
487                              0, 0, buf, 7, 100);
488         dbg ("0x21:0x20:0:0  %d", i);
489
490         /* change control lines if we are switching to or from B0 */
491         spin_lock_irqsave(&priv->lock, flags);
492         control = priv->line_control;
493         if ((cflag & CBAUD) == B0)
494                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
495         else
496                 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
497         if (control != priv->line_control) {
498                 control = priv->line_control;
499                 spin_unlock_irqrestore(&priv->lock, flags);
500                 set_control_lines(serial->dev, control);
501         } else {
502                 spin_unlock_irqrestore(&priv->lock, flags);
503         }
504         
505         buf[0] = buf[1] = buf[2] = buf[3] = buf[4] = buf[5] = buf[6] = 0;
506
507         i = usb_control_msg (serial->dev, usb_rcvctrlpipe (serial->dev, 0),
508                              GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
509                              0, 0, buf, 7, 100);
510         dbg ("0xa1:0x21:0:0  %d - %x %x %x %x %x %x %x", i,
511              buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
512
513         if (cflag & CRTSCTS) {
514                 __u16 index;
515                 if (priv->type == HX)
516                         index = 0x61;
517                 else
518                         index = 0x41;
519                 i = usb_control_msg(serial->dev, 
520                                     usb_sndctrlpipe(serial->dev, 0),
521                                     VENDOR_WRITE_REQUEST,
522                                     VENDOR_WRITE_REQUEST_TYPE,
523                                     0x0, index, NULL, 0, 100);
524                 dbg ("0x40:0x1:0x0:0x%x  %d", index, i);
525         }
526
527         kfree (buf);
528 }
529
530 static int pl2303_open (struct usb_serial_port *port, struct file *filp)
531 {
532         struct termios tmp_termios;
533         struct usb_serial *serial = port->serial;
534         struct pl2303_private *priv = usb_get_serial_port_data(port);
535         unsigned char *buf;
536         int result;
537
538         dbg("%s -  port %d", __FUNCTION__, port->number);
539
540         usb_clear_halt(serial->dev, port->write_urb->pipe);
541         usb_clear_halt(serial->dev, port->read_urb->pipe);
542
543         buf = kmalloc(10, GFP_KERNEL);
544         if (buf==NULL)
545                 return -ENOMEM;
546
547 #define FISH(a,b,c,d)                                                           \
548         result=usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev,0),     \
549                                b, a, c, d, buf, 1, 100);                        \
550         dbg("0x%x:0x%x:0x%x:0x%x  %d - %x",a,b,c,d,result,buf[0]);
551
552 #define SOUP(a,b,c,d)                                                           \
553         result=usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev,0),     \
554                                b, a, c, d, NULL, 0, 100);                       \
555         dbg("0x%x:0x%x:0x%x:0x%x  %d",a,b,c,d,result);
556
557         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
558         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 0);
559         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
560         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0);
561         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
562         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 1);
563         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
564         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0);
565         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0, 1);
566         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 1, 0);
567
568         if (priv->type == HX) {
569                 /* HX chip */
570                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 2, 0x44);
571                 /* reset upstream data pipes */
572                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 8, 0);
573                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 9, 0);
574         } else {
575                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 2, 0x24);
576         }
577
578         kfree(buf);
579
580         /* Setup termios */
581         if (port->tty) {
582                 pl2303_set_termios (port, &tmp_termios);
583         }
584
585         //FIXME: need to assert RTS and DTR if CRTSCTS off
586
587         dbg("%s - submitting read urb", __FUNCTION__);
588         port->read_urb->dev = serial->dev;
589         result = usb_submit_urb (port->read_urb, GFP_KERNEL);
590         if (result) {
591                 dev_err(&port->dev, "%s - failed submitting read urb, error %d\n", __FUNCTION__, result);
592                 pl2303_close (port, NULL);
593                 return -EPROTO;
594         }
595
596         dbg("%s - submitting interrupt urb", __FUNCTION__);
597         port->interrupt_in_urb->dev = serial->dev;
598         result = usb_submit_urb (port->interrupt_in_urb, GFP_KERNEL);
599         if (result) {
600                 dev_err(&port->dev, "%s - failed submitting interrupt urb, error %d\n", __FUNCTION__, result);
601                 pl2303_close (port, NULL);
602                 return -EPROTO;
603         }
604         return 0;
605 }
606
607
608 static void pl2303_close (struct usb_serial_port *port, struct file *filp)
609 {
610         struct pl2303_private *priv = usb_get_serial_port_data(port);
611         unsigned long flags;
612         unsigned int c_cflag;
613         int bps;
614         long timeout;
615         wait_queue_t wait;                                              \
616
617         dbg("%s - port %d", __FUNCTION__, port->number);
618
619         /* wait for data to drain from the buffer */
620         spin_lock_irqsave(&priv->lock, flags);
621         timeout = PL2303_CLOSING_WAIT;
622         init_waitqueue_entry(&wait, current);
623         add_wait_queue(&port->tty->write_wait, &wait);
624         for (;;) {
625                 set_current_state(TASK_INTERRUPTIBLE);
626                 if (pl2303_buf_data_avail(priv->buf) == 0
627                 || timeout == 0 || signal_pending(current)
628                 || !usb_get_intfdata(port->serial->interface))  /* disconnect */
629                         break;
630                 spin_unlock_irqrestore(&priv->lock, flags);
631                 timeout = schedule_timeout(timeout);
632                 spin_lock_irqsave(&priv->lock, flags);
633         }
634         set_current_state(TASK_RUNNING);
635         remove_wait_queue(&port->tty->write_wait, &wait);
636         /* clear out any remaining data in the buffer */
637         pl2303_buf_clear(priv->buf);
638         spin_unlock_irqrestore(&priv->lock, flags);
639
640         /* wait for characters to drain from the device */
641         /* (this is long enough for the entire 256 byte */
642         /* pl2303 hardware buffer to drain with no flow */
643         /* control for data rates of 1200 bps or more, */
644         /* for lower rates we should really know how much */
645         /* data is in the buffer to compute a delay */
646         /* that is not unnecessarily long) */
647         bps = tty_get_baud_rate(port->tty);
648         if (bps > 1200)
649                 timeout = max((HZ*2560)/bps,HZ/10);
650         else
651                 timeout = 2*HZ;
652         set_current_state(TASK_INTERRUPTIBLE);
653         schedule_timeout(timeout);
654
655         /* shutdown our urbs */
656         dbg("%s - shutting down urbs", __FUNCTION__);
657         usb_kill_urb(port->write_urb);
658         usb_kill_urb(port->read_urb);
659         usb_kill_urb(port->interrupt_in_urb);
660
661         if (port->tty) {
662                 c_cflag = port->tty->termios->c_cflag;
663                 if (c_cflag & HUPCL) {
664                         /* drop DTR and RTS */
665                         spin_lock_irqsave(&priv->lock, flags);
666                         priv->line_control = 0;
667                         spin_unlock_irqrestore (&priv->lock, flags);
668                         set_control_lines (port->serial->dev, 0);
669                 }
670         }
671 }
672
673 static int pl2303_tiocmset (struct usb_serial_port *port, struct file *file,
674                             unsigned int set, unsigned int clear)
675 {
676         struct pl2303_private *priv = usb_get_serial_port_data(port);
677         unsigned long flags;
678         u8 control;
679
680         if (!usb_get_intfdata(port->serial->interface))
681                 return -ENODEV;
682
683         spin_lock_irqsave (&priv->lock, flags);
684         if (set & TIOCM_RTS)
685                 priv->line_control |= CONTROL_RTS;
686         if (set & TIOCM_DTR)
687                 priv->line_control |= CONTROL_DTR;
688         if (clear & TIOCM_RTS)
689                 priv->line_control &= ~CONTROL_RTS;
690         if (clear & TIOCM_DTR)
691                 priv->line_control &= ~CONTROL_DTR;
692         control = priv->line_control;
693         spin_unlock_irqrestore (&priv->lock, flags);
694
695         return set_control_lines (port->serial->dev, control);
696 }
697
698 static int pl2303_tiocmget (struct usb_serial_port *port, struct file *file)
699 {
700         struct pl2303_private *priv = usb_get_serial_port_data(port);
701         unsigned long flags;
702         unsigned int mcr;
703         unsigned int status;
704         unsigned int result;
705
706         dbg("%s (%d)", __FUNCTION__, port->number);
707
708         if (!usb_get_intfdata(port->serial->interface))
709                 return -ENODEV;
710
711         spin_lock_irqsave (&priv->lock, flags);
712         mcr = priv->line_control;
713         status = priv->line_status;
714         spin_unlock_irqrestore (&priv->lock, flags);
715
716         result = ((mcr & CONTROL_DTR)           ? TIOCM_DTR : 0)
717                   | ((mcr & CONTROL_RTS)        ? TIOCM_RTS : 0)
718                   | ((status & UART_CTS)        ? TIOCM_CTS : 0)
719                   | ((status & UART_DSR)        ? TIOCM_DSR : 0)
720                   | ((status & UART_RING)       ? TIOCM_RI  : 0)
721                   | ((status & UART_DCD)        ? TIOCM_CD  : 0);
722
723         dbg("%s - result = %x", __FUNCTION__, result);
724
725         return result;
726 }
727
728 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
729 {
730         struct pl2303_private *priv = usb_get_serial_port_data(port);
731         unsigned long flags;
732         unsigned int prevstatus;
733         unsigned int status;
734         unsigned int changed;
735
736         spin_lock_irqsave (&priv->lock, flags);
737         prevstatus = priv->line_status;
738         spin_unlock_irqrestore (&priv->lock, flags);
739
740         while (1) {
741                 interruptible_sleep_on(&priv->delta_msr_wait);
742                 /* see if a signal did it */
743                 if (signal_pending(current))
744                         return -ERESTARTSYS;
745                 
746                 spin_lock_irqsave (&priv->lock, flags);
747                 status = priv->line_status;
748                 spin_unlock_irqrestore (&priv->lock, flags);
749                 
750                 changed=prevstatus^status;
751                 
752                 if (((arg & TIOCM_RNG) && (changed & UART_RING)) ||
753                     ((arg & TIOCM_DSR) && (changed & UART_DSR)) ||
754                     ((arg & TIOCM_CD)  && (changed & UART_DCD)) ||
755                     ((arg & TIOCM_CTS) && (changed & UART_CTS)) ) {
756                         return 0;
757                 }
758                 prevstatus = status;
759         }
760         /* NOTREACHED */
761         return 0;
762 }
763
764 static int pl2303_ioctl (struct usb_serial_port *port, struct file *file, unsigned int cmd, unsigned long arg)
765 {
766         dbg("%s (%d) cmd = 0x%04x", __FUNCTION__, port->number, cmd);
767
768         switch (cmd) {
769                 case TIOCMIWAIT:
770                         dbg("%s (%d) TIOCMIWAIT", __FUNCTION__,  port->number);
771                         return wait_modem_info(port, arg);
772
773                 default:
774                         dbg("%s not supported = 0x%04x", __FUNCTION__, cmd);
775                         break;
776         }
777
778         return -ENOIOCTLCMD;
779 }
780
781 static void pl2303_break_ctl (struct usb_serial_port *port, int break_state)
782 {
783         struct usb_serial *serial = port->serial;
784         u16 state;
785         int result;
786
787         dbg("%s - port %d", __FUNCTION__, port->number);
788
789         if (break_state == 0)
790                 state = BREAK_OFF;
791         else
792                 state = BREAK_ON;
793         dbg("%s - turning break %s", __FUNCTION__, state==BREAK_OFF ? "off" : "on");
794
795         result = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0),
796                                   BREAK_REQUEST, BREAK_REQUEST_TYPE, state, 
797                                   0, NULL, 0, 100);
798         if (result)
799                 dbg("%s - error sending break = %d", __FUNCTION__, result);
800 }
801
802
803 static void pl2303_shutdown (struct usb_serial *serial)
804 {
805         int i;
806         struct pl2303_private *priv;
807
808         dbg("%s", __FUNCTION__);
809
810         for (i = 0; i < serial->num_ports; ++i) {
811                 priv = usb_get_serial_port_data(serial->port[i]);
812                 if (priv) {
813                         pl2303_buf_free(priv->buf);
814                         kfree(priv);
815                         usb_set_serial_port_data(serial->port[i], NULL);
816                 }
817         }               
818 }
819
820 static void pl2303_update_line_status(struct usb_serial_port *port,
821                                       unsigned char *data,
822                                       unsigned int actual_length)
823 {
824
825         struct pl2303_private *priv = usb_get_serial_port_data(port);
826         unsigned long flags;
827         u8 status_idx = UART_STATE;
828         u8 length = UART_STATE;
829
830         if ((le16_to_cpu(port->serial->dev->descriptor.idVendor) == SIEMENS_VENDOR_ID) &&
831             (le16_to_cpu(port->serial->dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_X65)) {
832                 length = 1;
833                 status_idx = 0;
834         }
835
836         if (actual_length < length)
837                 goto exit;
838
839         /* Save off the uart status for others to look at */
840         spin_lock_irqsave(&priv->lock, flags);
841         priv->line_status = data[status_idx];
842         spin_unlock_irqrestore(&priv->lock, flags);
843
844 exit:
845         return;
846 }
847
848 static void pl2303_read_int_callback (struct urb *urb, struct pt_regs *regs)
849 {
850         struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
851         unsigned char *data = urb->transfer_buffer;
852         unsigned int actual_length = urb->actual_length;
853         int status;
854
855         dbg("%s (%d)", __FUNCTION__, port->number);
856
857         switch (urb->status) {
858         case 0:
859                 /* success */
860                 break;
861         case -ECONNRESET:
862         case -ENOENT:
863         case -ESHUTDOWN:
864                 /* this urb is terminated, clean up */
865                 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
866                 return;
867         default:
868                 dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
869                 goto exit;
870         }
871
872         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, urb->transfer_buffer);
873         pl2303_update_line_status(port, data, actual_length);
874
875 exit:
876         status = usb_submit_urb (urb, GFP_ATOMIC);
877         if (status)
878                 dev_err(&urb->dev->dev, "%s - usb_submit_urb failed with result %d\n",
879                         __FUNCTION__, status);
880 }
881
882
883 static void pl2303_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
884 {
885         struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
886         struct pl2303_private *priv = usb_get_serial_port_data(port);
887         struct tty_struct *tty;
888         unsigned char *data = urb->transfer_buffer;
889         unsigned long flags;
890         int i;
891         int result;
892         u8 status;
893         char tty_flag;
894
895         dbg("%s - port %d", __FUNCTION__, port->number);
896
897         if (urb->status) {
898                 dbg("%s - urb->status = %d", __FUNCTION__, urb->status);
899                 if (!port->open_count) {
900                         dbg("%s - port is closed, exiting.", __FUNCTION__);
901                         return;
902                 }
903                 if (urb->status == -EPROTO) {
904                         /* PL2303 mysteriously fails with -EPROTO reschedule the read */
905                         dbg("%s - caught -EPROTO, resubmitting the urb", __FUNCTION__);
906                         urb->status = 0;
907                         urb->dev = port->serial->dev;
908                         result = usb_submit_urb(urb, GFP_ATOMIC);
909                         if (result)
910                                 dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
911                         return;
912                 }
913                 dbg("%s - unable to handle the error, exiting.", __FUNCTION__);
914                 return;
915         }
916
917         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
918
919         /* get tty_flag from status */
920         tty_flag = TTY_NORMAL;
921
922         spin_lock_irqsave(&priv->lock, flags);
923         status = priv->line_status;
924         priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
925         spin_unlock_irqrestore(&priv->lock, flags);
926         wake_up_interruptible (&priv->delta_msr_wait);
927
928         /* break takes precedence over parity, */
929         /* which takes precedence over framing errors */
930         if (status & UART_BREAK_ERROR )
931                 tty_flag = TTY_BREAK;
932         else if (status & UART_PARITY_ERROR)
933                 tty_flag = TTY_PARITY;
934         else if (status & UART_FRAME_ERROR)
935                 tty_flag = TTY_FRAME;
936         dbg("%s - tty_flag = %d", __FUNCTION__, tty_flag);
937
938         tty = port->tty;
939         if (tty && urb->actual_length) {
940                 /* overrun is special, not associated with a char */
941                 if (status & UART_OVERRUN_ERROR)
942                         tty_insert_flip_char(tty, 0, TTY_OVERRUN);
943
944                 for (i = 0; i < urb->actual_length; ++i) {
945                         if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
946                                 tty_flip_buffer_push(tty);
947                         }
948                         tty_insert_flip_char (tty, data[i], tty_flag);
949                 }
950                 tty_flip_buffer_push (tty);
951         }
952
953         /* Schedule the next read _if_ we are still open */
954         if (port->open_count) {
955                 urb->dev = port->serial->dev;
956                 result = usb_submit_urb(urb, GFP_ATOMIC);
957                 if (result)
958                         dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
959         }
960
961         return;
962 }
963
964
965
966 static void pl2303_write_bulk_callback (struct urb *urb, struct pt_regs *regs)
967 {
968         struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
969         struct pl2303_private *priv = usb_get_serial_port_data(port);
970         int result;
971
972         dbg("%s - port %d", __FUNCTION__, port->number);
973
974         switch (urb->status) {
975         case 0:
976                 /* success */
977                 break;
978         case -ECONNRESET:
979         case -ENOENT:
980         case -ESHUTDOWN:
981                 /* this urb is terminated, clean up */
982                 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
983                 priv->write_urb_in_use = 0;
984                 return;
985         default:
986                 /* error in the urb, so we have to resubmit it */
987                 dbg("%s - Overflow in write", __FUNCTION__);
988                 dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
989                 port->write_urb->transfer_buffer_length = 1;
990                 port->write_urb->dev = port->serial->dev;
991                 result = usb_submit_urb (port->write_urb, GFP_ATOMIC);
992                 if (result)
993                         dev_err(&urb->dev->dev, "%s - failed resubmitting write urb, error %d\n", __FUNCTION__, result);
994                 else
995                         return;
996         }
997
998         priv->write_urb_in_use = 0;
999
1000         /* send any buffered data */
1001         pl2303_send(port);
1002 }
1003
1004
1005 /*
1006  * pl2303_buf_alloc
1007  *
1008  * Allocate a circular buffer and all associated memory.
1009  */
1010
1011 static struct pl2303_buf *pl2303_buf_alloc(unsigned int size)
1012 {
1013
1014         struct pl2303_buf *pb;
1015
1016
1017         if (size == 0)
1018                 return NULL;
1019
1020         pb = (struct pl2303_buf *)kmalloc(sizeof(struct pl2303_buf), GFP_KERNEL);
1021         if (pb == NULL)
1022                 return NULL;
1023
1024         pb->buf_buf = kmalloc(size, GFP_KERNEL);
1025         if (pb->buf_buf == NULL) {
1026                 kfree(pb);
1027                 return NULL;
1028         }
1029
1030         pb->buf_size = size;
1031         pb->buf_get = pb->buf_put = pb->buf_buf;
1032
1033         return pb;
1034
1035 }
1036
1037
1038 /*
1039  * pl2303_buf_free
1040  *
1041  * Free the buffer and all associated memory.
1042  */
1043
1044 static void pl2303_buf_free(struct pl2303_buf *pb)
1045 {
1046         if (pb != NULL) {
1047                 if (pb->buf_buf != NULL)
1048                         kfree(pb->buf_buf);
1049                 kfree(pb);
1050         }
1051 }
1052
1053
1054 /*
1055  * pl2303_buf_clear
1056  *
1057  * Clear out all data in the circular buffer.
1058  */
1059
1060 static void pl2303_buf_clear(struct pl2303_buf *pb)
1061 {
1062         if (pb != NULL)
1063                 pb->buf_get = pb->buf_put;
1064                 /* equivalent to a get of all data available */
1065 }
1066
1067
1068 /*
1069  * pl2303_buf_data_avail
1070  *
1071  * Return the number of bytes of data available in the circular
1072  * buffer.
1073  */
1074
1075 static unsigned int pl2303_buf_data_avail(struct pl2303_buf *pb)
1076 {
1077         if (pb != NULL)
1078                 return ((pb->buf_size + pb->buf_put - pb->buf_get) % pb->buf_size);
1079         else
1080                 return 0;
1081 }
1082
1083
1084 /*
1085  * pl2303_buf_space_avail
1086  *
1087  * Return the number of bytes of space available in the circular
1088  * buffer.
1089  */
1090
1091 static unsigned int pl2303_buf_space_avail(struct pl2303_buf *pb)
1092 {
1093         if (pb != NULL)
1094                 return ((pb->buf_size + pb->buf_get - pb->buf_put - 1) % pb->buf_size);
1095         else
1096                 return 0;
1097 }
1098
1099
1100 /*
1101  * pl2303_buf_put
1102  *
1103  * Copy data data from a user buffer and put it into the circular buffer.
1104  * Restrict to the amount of space available.
1105  *
1106  * Return the number of bytes copied.
1107  */
1108
1109 static unsigned int pl2303_buf_put(struct pl2303_buf *pb, const char *buf,
1110         unsigned int count)
1111 {
1112
1113         unsigned int len;
1114
1115
1116         if (pb == NULL)
1117                 return 0;
1118
1119         len  = pl2303_buf_space_avail(pb);
1120         if (count > len)
1121                 count = len;
1122
1123         if (count == 0)
1124                 return 0;
1125
1126         len = pb->buf_buf + pb->buf_size - pb->buf_put;
1127         if (count > len) {
1128                 memcpy(pb->buf_put, buf, len);
1129                 memcpy(pb->buf_buf, buf+len, count - len);
1130                 pb->buf_put = pb->buf_buf + count - len;
1131         } else {
1132                 memcpy(pb->buf_put, buf, count);
1133                 if (count < len)
1134                         pb->buf_put += count;
1135                 else /* count == len */
1136                         pb->buf_put = pb->buf_buf;
1137         }
1138
1139         return count;
1140
1141 }
1142
1143
1144 /*
1145  * pl2303_buf_get
1146  *
1147  * Get data from the circular buffer and copy to the given buffer.
1148  * Restrict to the amount of data available.
1149  *
1150  * Return the number of bytes copied.
1151  */
1152
1153 static unsigned int pl2303_buf_get(struct pl2303_buf *pb, char *buf,
1154         unsigned int count)
1155 {
1156
1157         unsigned int len;
1158
1159
1160         if (pb == NULL)
1161                 return 0;
1162
1163         len = pl2303_buf_data_avail(pb);
1164         if (count > len)
1165                 count = len;
1166
1167         if (count == 0)
1168                 return 0;
1169
1170         len = pb->buf_buf + pb->buf_size - pb->buf_get;
1171         if (count > len) {
1172                 memcpy(buf, pb->buf_get, len);
1173                 memcpy(buf+len, pb->buf_buf, count - len);
1174                 pb->buf_get = pb->buf_buf + count - len;
1175         } else {
1176                 memcpy(buf, pb->buf_get, count);
1177                 if (count < len)
1178                         pb->buf_get += count;
1179                 else /* count == len */
1180                         pb->buf_get = pb->buf_buf;
1181         }
1182
1183         return count;
1184
1185 }
1186
1187 static int __init pl2303_init (void)
1188 {
1189         int retval;
1190         retval = usb_serial_register(&pl2303_device);
1191         if (retval)
1192                 goto failed_usb_serial_register;
1193         retval = usb_register(&pl2303_driver);
1194         if (retval)
1195                 goto failed_usb_register;
1196         info(DRIVER_DESC " " DRIVER_VERSION);
1197         return 0;
1198 failed_usb_register:
1199         usb_serial_deregister(&pl2303_device);
1200 failed_usb_serial_register:
1201         return retval;
1202 }
1203
1204
1205 static void __exit pl2303_exit (void)
1206 {
1207         usb_deregister (&pl2303_driver);
1208         usb_serial_deregister (&pl2303_device);
1209 }
1210
1211
1212 module_init(pl2303_init);
1213 module_exit(pl2303_exit);
1214
1215 MODULE_DESCRIPTION(DRIVER_DESC);
1216 MODULE_VERSION(DRIVER_VERSION);
1217 MODULE_LICENSE("GPL");
1218
1219 module_param(debug, bool, S_IRUGO | S_IWUSR);
1220 MODULE_PARM_DESC(debug, "Debug enabled or not");
1221