e2600e7ce4eaf6a3baed2a53d0629e6e489cfd04
[linux-2.6.git] / drivers / usb / serial / cp210x.c
1 /*
2  * Silicon Laboratories CP210x USB to RS232 serial adaptor driver
3  *
4  * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
5  *
6  *      This program is free software; you can redistribute it and/or
7  *      modify it under the terms of the GNU General Public License version
8  *      2 as published by the Free Software Foundation.
9  *
10  * Support to set flow control line levels using TIOCMGET and TIOCMSET
11  * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow
12  * control thanks to Munir Nassar nassarmu@real-time.com
13  *
14  */
15
16 #include <linux/kernel.h>
17 #include <linux/errno.h>
18 #include <linux/slab.h>
19 #include <linux/tty.h>
20 #include <linux/tty_flip.h>
21 #include <linux/module.h>
22 #include <linux/moduleparam.h>
23 #include <linux/usb.h>
24 #include <linux/uaccess.h>
25 #include <linux/usb/serial.h>
26
27 /*
28  * Version Information
29  */
30 #define DRIVER_VERSION "v0.09"
31 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
32
33 /*
34  * Function Prototypes
35  */
36 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
37 static void cp210x_cleanup(struct usb_serial_port *);
38 static void cp210x_close(struct usb_serial_port *);
39 static void cp210x_get_termios(struct tty_struct *,
40         struct usb_serial_port *port);
41 static void cp210x_get_termios_port(struct usb_serial_port *port,
42         unsigned int *cflagp, unsigned int *baudp);
43 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
44                                                         struct ktermios*);
45 static int cp210x_tiocmget(struct tty_struct *, struct file *);
46 static int cp210x_tiocmset(struct tty_struct *, struct file *,
47                 unsigned int, unsigned int);
48 static int cp210x_tiocmset_port(struct usb_serial_port *port, struct file *,
49                 unsigned int, unsigned int);
50 static void cp210x_break_ctl(struct tty_struct *, int);
51 static int cp210x_startup(struct usb_serial *);
52 static void cp210x_disconnect(struct usb_serial *);
53 static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
54 static int cp210x_carrier_raised(struct usb_serial_port *p);
55
56 static int debug;
57
58 static const struct usb_device_id id_table[] = {
59         { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
60         { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
61         { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
62         { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
63         { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
64         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
65         { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
66         { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
67         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
68         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
69         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
70         { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
71         { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
72         { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
73         { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
74         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
75         { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
76         { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
77         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
78         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
79         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
80         { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
81         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
82         { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
83         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
84         { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
85         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
86         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
87         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
88         { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
89         { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
90         { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
91         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
92         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
93         { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
94         { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
95         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
96         { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
97         { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demostration module */
98         { USB_DEVICE(0x10c4, 0x8293) }, /* Telegesys ETRX2USB */
99         { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
100         { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
101         { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
102         { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
103         { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
104         { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
105         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
106         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
107         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
108         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
109         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
110         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
111         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
112         { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
113         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
114         { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
115         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
116         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
117         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
118         { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
119         { } /* Terminating Entry */
120 };
121
122 MODULE_DEVICE_TABLE(usb, id_table);
123
124 static struct usb_driver cp210x_driver = {
125         .name           = "cp210x",
126         .probe          = usb_serial_probe,
127         .disconnect     = usb_serial_disconnect,
128         .id_table       = id_table,
129         .no_dynamic_id  =       1,
130 };
131
132 static struct usb_serial_driver cp210x_device = {
133         .driver = {
134                 .owner =        THIS_MODULE,
135                 .name =         "cp210x",
136         },
137         .usb_driver             = &cp210x_driver,
138         .id_table               = id_table,
139         .num_ports              = 1,
140         .open                   = cp210x_open,
141         .close                  = cp210x_close,
142         .break_ctl              = cp210x_break_ctl,
143         .set_termios            = cp210x_set_termios,
144         .tiocmget               = cp210x_tiocmget,
145         .tiocmset               = cp210x_tiocmset,
146         .attach                 = cp210x_startup,
147         .disconnect             = cp210x_disconnect,
148         .dtr_rts                = cp210x_dtr_rts,
149         .carrier_raised         = cp210x_carrier_raised
150 };
151
152 /* Config request types */
153 #define REQTYPE_HOST_TO_DEVICE  0x41
154 #define REQTYPE_DEVICE_TO_HOST  0xc1
155
156 /* Config request codes */
157 #define CP210X_IFC_ENABLE       0x00
158 #define CP210X_SET_BAUDDIV      0x01
159 #define CP210X_GET_BAUDDIV      0x02
160 #define CP210X_SET_LINE_CTL     0x03
161 #define CP210X_GET_LINE_CTL     0x04
162 #define CP210X_SET_BREAK        0x05
163 #define CP210X_IMM_CHAR         0x06
164 #define CP210X_SET_MHS          0x07
165 #define CP210X_GET_MDMSTS       0x08
166 #define CP210X_SET_XON          0x09
167 #define CP210X_SET_XOFF         0x0A
168 #define CP210X_SET_EVENTMASK    0x0B
169 #define CP210X_GET_EVENTMASK    0x0C
170 #define CP210X_SET_CHAR         0x0D
171 #define CP210X_GET_CHARS        0x0E
172 #define CP210X_GET_PROPS        0x0F
173 #define CP210X_GET_COMM_STATUS  0x10
174 #define CP210X_RESET            0x11
175 #define CP210X_PURGE            0x12
176 #define CP210X_SET_FLOW         0x13
177 #define CP210X_GET_FLOW         0x14
178 #define CP210X_EMBED_EVENTS     0x15
179 #define CP210X_GET_EVENTSTATE   0x16
180 #define CP210X_SET_CHARS        0x19
181
182 /* CP210X_IFC_ENABLE */
183 #define UART_ENABLE             0x0001
184 #define UART_DISABLE            0x0000
185
186 /* CP210X_(SET|GET)_BAUDDIV */
187 #define BAUD_RATE_GEN_FREQ      0x384000
188
189 /* CP210X_(SET|GET)_LINE_CTL */
190 #define BITS_DATA_MASK          0X0f00
191 #define BITS_DATA_5             0X0500
192 #define BITS_DATA_6             0X0600
193 #define BITS_DATA_7             0X0700
194 #define BITS_DATA_8             0X0800
195 #define BITS_DATA_9             0X0900
196
197 #define BITS_PARITY_MASK        0x00f0
198 #define BITS_PARITY_NONE        0x0000
199 #define BITS_PARITY_ODD         0x0010
200 #define BITS_PARITY_EVEN        0x0020
201 #define BITS_PARITY_MARK        0x0030
202 #define BITS_PARITY_SPACE       0x0040
203
204 #define BITS_STOP_MASK          0x000f
205 #define BITS_STOP_1             0x0000
206 #define BITS_STOP_1_5           0x0001
207 #define BITS_STOP_2             0x0002
208
209 /* CP210X_SET_BREAK */
210 #define BREAK_ON                0x0000
211 #define BREAK_OFF               0x0001
212
213 /* CP210X_(SET_MHS|GET_MDMSTS) */
214 #define CONTROL_DTR             0x0001
215 #define CONTROL_RTS             0x0002
216 #define CONTROL_CTS             0x0010
217 #define CONTROL_DSR             0x0020
218 #define CONTROL_RING            0x0040
219 #define CONTROL_DCD             0x0080
220 #define CONTROL_WRITE_DTR       0x0100
221 #define CONTROL_WRITE_RTS       0x0200
222
223 /*
224  * cp210x_get_config
225  * Reads from the CP210x configuration registers
226  * 'size' is specified in bytes.
227  * 'data' is a pointer to a pre-allocated array of integers large
228  * enough to hold 'size' bytes (with 4 bytes to each integer)
229  */
230 static int cp210x_get_config(struct usb_serial_port *port, u8 request,
231                 unsigned int *data, int size)
232 {
233         struct usb_serial *serial = port->serial;
234         __le32 *buf;
235         int result, i, length;
236
237         /* Number of integers required to contain the array */
238         length = (((size - 1) | 3) + 1)/4;
239
240         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
241         if (!buf) {
242                 dev_err(&port->dev, "%s - out of memory.\n", __func__);
243                 return -ENOMEM;
244         }
245
246         /* Issue the request, attempting to read 'size' bytes */
247         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
248                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
249                                 0, buf, size, 300);
250
251         /* Convert data into an array of integers */
252         for (i = 0; i < length; i++)
253                 data[i] = le32_to_cpu(buf[i]);
254
255         kfree(buf);
256
257         if (result != size) {
258                 dbg("%s - Unable to send config request, "
259                                 "request=0x%x size=%d result=%d\n",
260                                 __func__, request, size, result);
261                 return -EPROTO;
262         }
263
264         return 0;
265 }
266
267 /*
268  * cp210x_set_config
269  * Writes to the CP210x configuration registers
270  * Values less than 16 bits wide are sent directly
271  * 'size' is specified in bytes.
272  */
273 static int cp210x_set_config(struct usb_serial_port *port, u8 request,
274                 unsigned int *data, int size)
275 {
276         struct usb_serial *serial = port->serial;
277         __le32 *buf;
278         int result, i, length;
279
280         /* Number of integers required to contain the array */
281         length = (((size - 1) | 3) + 1)/4;
282
283         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
284         if (!buf) {
285                 dev_err(&port->dev, "%s - out of memory.\n",
286                                 __func__);
287                 return -ENOMEM;
288         }
289
290         /* Array of integers into bytes */
291         for (i = 0; i < length; i++)
292                 buf[i] = cpu_to_le32(data[i]);
293
294         if (size > 2) {
295                 result = usb_control_msg(serial->dev,
296                                 usb_sndctrlpipe(serial->dev, 0),
297                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
298                                 0, buf, size, 300);
299         } else {
300                 result = usb_control_msg(serial->dev,
301                                 usb_sndctrlpipe(serial->dev, 0),
302                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
303                                 0, NULL, 0, 300);
304         }
305
306         kfree(buf);
307
308         if ((size > 2 && result != size) || result < 0) {
309                 dbg("%s - Unable to send request, "
310                                 "request=0x%x size=%d result=%d\n",
311                                 __func__, request, size, result);
312                 return -EPROTO;
313         }
314
315         /* Single data value */
316         result = usb_control_msg(serial->dev,
317                         usb_sndctrlpipe(serial->dev, 0),
318                         request, REQTYPE_HOST_TO_DEVICE, data[0],
319                         0, NULL, 0, 300);
320         return 0;
321 }
322
323 /*
324  * cp210x_set_config_single
325  * Convenience function for calling cp210x_set_config on single data values
326  * without requiring an integer pointer
327  */
328 static inline int cp210x_set_config_single(struct usb_serial_port *port,
329                 u8 request, unsigned int data)
330 {
331         return cp210x_set_config(port, request, &data, 2);
332 }
333
334 /*
335  * cp210x_quantise_baudrate
336  * Quantises the baud rate as per AN205 Table 1
337  */
338 static unsigned int cp210x_quantise_baudrate(unsigned int baud) {
339         if      (baud <= 56)       baud = 0;
340         else if (baud <= 300)      baud = 300;
341         else if (baud <= 600)      baud = 600;
342         else if (baud <= 1200)     baud = 1200;
343         else if (baud <= 1800)     baud = 1800;
344         else if (baud <= 2400)     baud = 2400;
345         else if (baud <= 4000)     baud = 4000;
346         else if (baud <= 4803)     baud = 4800;
347         else if (baud <= 7207)     baud = 7200;
348         else if (baud <= 9612)     baud = 9600;
349         else if (baud <= 14428)    baud = 14400;
350         else if (baud <= 16062)    baud = 16000;
351         else if (baud <= 19250)    baud = 19200;
352         else if (baud <= 28912)    baud = 28800;
353         else if (baud <= 38601)    baud = 38400;
354         else if (baud <= 51558)    baud = 51200;
355         else if (baud <= 56280)    baud = 56000;
356         else if (baud <= 58053)    baud = 57600;
357         else if (baud <= 64111)    baud = 64000;
358         else if (baud <= 77608)    baud = 76800;
359         else if (baud <= 117028)   baud = 115200;
360         else if (baud <= 129347)   baud = 128000;
361         else if (baud <= 156868)   baud = 153600;
362         else if (baud <= 237832)   baud = 230400;
363         else if (baud <= 254234)   baud = 250000;
364         else if (baud <= 273066)   baud = 256000;
365         else if (baud <= 491520)   baud = 460800;
366         else if (baud <= 567138)   baud = 500000;
367         else if (baud <= 670254)   baud = 576000;
368         else if (baud <= 1053257)  baud = 921600;
369         else if (baud <= 1474560)  baud = 1228800;
370         else if (baud <= 2457600)  baud = 1843200;
371         else                       baud = 3686400;
372         return baud;
373 }
374
375 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
376 {
377         struct usb_serial *serial = port->serial;
378         int result;
379
380         dbg("%s - port %d", __func__, port->number);
381
382         if (cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_ENABLE)) {
383                 dev_err(&port->dev, "%s - Unable to enable UART\n",
384                                 __func__);
385                 return -EPROTO;
386         }
387
388         /* Start reading from the device */
389         usb_fill_bulk_urb(port->read_urb, serial->dev,
390                         usb_rcvbulkpipe(serial->dev,
391                         port->bulk_in_endpointAddress),
392                         port->read_urb->transfer_buffer,
393                         port->read_urb->transfer_buffer_length,
394                         serial->type->read_bulk_callback,
395                         port);
396         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
397         if (result) {
398                 dev_err(&port->dev, "%s - failed resubmitting read urb, "
399                                 "error %d\n", __func__, result);
400                 return result;
401         }
402
403         /* Configure the termios structure */
404         cp210x_get_termios(tty, port);
405         return 0;
406 }
407
408 static void cp210x_cleanup(struct usb_serial_port *port)
409 {
410         struct usb_serial *serial = port->serial;
411
412         dbg("%s - port %d", __func__, port->number);
413
414         if (serial->dev) {
415                 /* shutdown any bulk reads that might be going on */
416                 if (serial->num_bulk_out)
417                         usb_kill_urb(port->write_urb);
418                 if (serial->num_bulk_in)
419                         usb_kill_urb(port->read_urb);
420         }
421 }
422
423 static void cp210x_close(struct usb_serial_port *port)
424 {
425         dbg("%s - port %d", __func__, port->number);
426
427         /* shutdown our urbs */
428         dbg("%s - shutting down urbs", __func__);
429         usb_kill_urb(port->write_urb);
430         usb_kill_urb(port->read_urb);
431
432         mutex_lock(&port->serial->disc_mutex);
433         if (!port->serial->disconnected)
434                 cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE);
435         mutex_unlock(&port->serial->disc_mutex);
436 }
437
438 /*
439  * cp210x_get_termios
440  * Reads the baud rate, data bits, parity, stop bits and flow control mode
441  * from the device, corrects any unsupported values, and configures the
442  * termios structure to reflect the state of the device
443  */
444 static void cp210x_get_termios(struct tty_struct *tty,
445         struct usb_serial_port *port)
446 {
447         unsigned int baud;
448
449         if (tty) {
450                 cp210x_get_termios_port(tty->driver_data,
451                         &tty->termios->c_cflag, &baud);
452                 tty_encode_baud_rate(tty, baud, baud);
453         }
454
455         else {
456                 unsigned int cflag;
457                 cflag = 0;
458                 cp210x_get_termios_port(port, &cflag, &baud);
459         }
460 }
461
462 /*
463  * cp210x_get_termios_port
464  * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
465  */
466 static void cp210x_get_termios_port(struct usb_serial_port *port,
467         unsigned int *cflagp, unsigned int *baudp)
468 {
469         unsigned int cflag, modem_ctl[4];
470         unsigned int baud;
471         unsigned int bits;
472
473         dbg("%s - port %d", __func__, port->number);
474
475         cp210x_get_config(port, CP210X_GET_BAUDDIV, &baud, 2);
476         /* Convert to baudrate */
477         if (baud)
478                 baud = cp210x_quantise_baudrate((BAUD_RATE_GEN_FREQ + baud/2)/ baud);
479
480         dbg("%s - baud rate = %d", __func__, baud);
481         *baudp = baud;
482
483         cflag = *cflagp;
484
485         cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
486         cflag &= ~CSIZE;
487         switch (bits & BITS_DATA_MASK) {
488         case BITS_DATA_5:
489                 dbg("%s - data bits = 5", __func__);
490                 cflag |= CS5;
491                 break;
492         case BITS_DATA_6:
493                 dbg("%s - data bits = 6", __func__);
494                 cflag |= CS6;
495                 break;
496         case BITS_DATA_7:
497                 dbg("%s - data bits = 7", __func__);
498                 cflag |= CS7;
499                 break;
500         case BITS_DATA_8:
501                 dbg("%s - data bits = 8", __func__);
502                 cflag |= CS8;
503                 break;
504         case BITS_DATA_9:
505                 dbg("%s - data bits = 9 (not supported, using 8 data bits)",
506                                                                 __func__);
507                 cflag |= CS8;
508                 bits &= ~BITS_DATA_MASK;
509                 bits |= BITS_DATA_8;
510                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
511                 break;
512         default:
513                 dbg("%s - Unknown number of data bits, using 8", __func__);
514                 cflag |= CS8;
515                 bits &= ~BITS_DATA_MASK;
516                 bits |= BITS_DATA_8;
517                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
518                 break;
519         }
520
521         switch (bits & BITS_PARITY_MASK) {
522         case BITS_PARITY_NONE:
523                 dbg("%s - parity = NONE", __func__);
524                 cflag &= ~PARENB;
525                 break;
526         case BITS_PARITY_ODD:
527                 dbg("%s - parity = ODD", __func__);
528                 cflag |= (PARENB|PARODD);
529                 break;
530         case BITS_PARITY_EVEN:
531                 dbg("%s - parity = EVEN", __func__);
532                 cflag &= ~PARODD;
533                 cflag |= PARENB;
534                 break;
535         case BITS_PARITY_MARK:
536                 dbg("%s - parity = MARK (not supported, disabling parity)",
537                                 __func__);
538                 cflag &= ~PARENB;
539                 bits &= ~BITS_PARITY_MASK;
540                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
541                 break;
542         case BITS_PARITY_SPACE:
543                 dbg("%s - parity = SPACE (not supported, disabling parity)",
544                                 __func__);
545                 cflag &= ~PARENB;
546                 bits &= ~BITS_PARITY_MASK;
547                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
548                 break;
549         default:
550                 dbg("%s - Unknown parity mode, disabling parity", __func__);
551                 cflag &= ~PARENB;
552                 bits &= ~BITS_PARITY_MASK;
553                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
554                 break;
555         }
556
557         cflag &= ~CSTOPB;
558         switch (bits & BITS_STOP_MASK) {
559         case BITS_STOP_1:
560                 dbg("%s - stop bits = 1", __func__);
561                 break;
562         case BITS_STOP_1_5:
563                 dbg("%s - stop bits = 1.5 (not supported, using 1 stop bit)",
564                                                                 __func__);
565                 bits &= ~BITS_STOP_MASK;
566                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
567                 break;
568         case BITS_STOP_2:
569                 dbg("%s - stop bits = 2", __func__);
570                 cflag |= CSTOPB;
571                 break;
572         default:
573                 dbg("%s - Unknown number of stop bits, using 1 stop bit",
574                                                                 __func__);
575                 bits &= ~BITS_STOP_MASK;
576                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
577                 break;
578         }
579
580         cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
581         if (modem_ctl[0] & 0x0008) {
582                 dbg("%s - flow control = CRTSCTS", __func__);
583                 cflag |= CRTSCTS;
584         } else {
585                 dbg("%s - flow control = NONE", __func__);
586                 cflag &= ~CRTSCTS;
587         }
588
589         *cflagp = cflag;
590 }
591
592 static void cp210x_set_termios(struct tty_struct *tty,
593                 struct usb_serial_port *port, struct ktermios *old_termios)
594 {
595         unsigned int cflag, old_cflag;
596         unsigned int baud = 0, bits;
597         unsigned int modem_ctl[4];
598
599         dbg("%s - port %d", __func__, port->number);
600
601         if (!tty)
602                 return;
603
604         tty->termios->c_cflag &= ~CMSPAR;
605         cflag = tty->termios->c_cflag;
606         old_cflag = old_termios->c_cflag;
607         baud = cp210x_quantise_baudrate(tty_get_baud_rate(tty));
608
609         /* If the baud rate is to be updated*/
610         if (baud != tty_termios_baud_rate(old_termios) && baud != 0) {
611                 dbg("%s - Setting baud rate to %d baud", __func__,
612                                 baud);
613                 if (cp210x_set_config_single(port, CP210X_SET_BAUDDIV,
614                                         ((BAUD_RATE_GEN_FREQ + baud/2) / baud))) {
615                         dbg("Baud rate requested not supported by device");
616                         baud = tty_termios_baud_rate(old_termios);
617                 }
618         }
619         /* Report back the resulting baud rate */
620         tty_encode_baud_rate(tty, baud, baud);
621
622         /* If the number of data bits is to be updated */
623         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
624                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
625                 bits &= ~BITS_DATA_MASK;
626                 switch (cflag & CSIZE) {
627                 case CS5:
628                         bits |= BITS_DATA_5;
629                         dbg("%s - data bits = 5", __func__);
630                         break;
631                 case CS6:
632                         bits |= BITS_DATA_6;
633                         dbg("%s - data bits = 6", __func__);
634                         break;
635                 case CS7:
636                         bits |= BITS_DATA_7;
637                         dbg("%s - data bits = 7", __func__);
638                         break;
639                 case CS8:
640                         bits |= BITS_DATA_8;
641                         dbg("%s - data bits = 8", __func__);
642                         break;
643                 /*case CS9:
644                         bits |= BITS_DATA_9;
645                         dbg("%s - data bits = 9", __func__);
646                         break;*/
647                 default:
648                         dbg("cp210x driver does not "
649                                         "support the number of bits requested,"
650                                         " using 8 bit mode\n");
651                                 bits |= BITS_DATA_8;
652                                 break;
653                 }
654                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
655                         dbg("Number of data bits requested "
656                                         "not supported by device\n");
657         }
658
659         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
660                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
661                 bits &= ~BITS_PARITY_MASK;
662                 if (cflag & PARENB) {
663                         if (cflag & PARODD) {
664                                 bits |= BITS_PARITY_ODD;
665                                 dbg("%s - parity = ODD", __func__);
666                         } else {
667                                 bits |= BITS_PARITY_EVEN;
668                                 dbg("%s - parity = EVEN", __func__);
669                         }
670                 }
671                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
672                         dbg("Parity mode not supported "
673                                         "by device\n");
674         }
675
676         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
677                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
678                 bits &= ~BITS_STOP_MASK;
679                 if (cflag & CSTOPB) {
680                         bits |= BITS_STOP_2;
681                         dbg("%s - stop bits = 2", __func__);
682                 } else {
683                         bits |= BITS_STOP_1;
684                         dbg("%s - stop bits = 1", __func__);
685                 }
686                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
687                         dbg("Number of stop bits requested "
688                                         "not supported by device\n");
689         }
690
691         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
692                 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
693                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
694                                 __func__, modem_ctl[0], modem_ctl[1],
695                                 modem_ctl[2], modem_ctl[3]);
696
697                 if (cflag & CRTSCTS) {
698                         modem_ctl[0] &= ~0x7B;
699                         modem_ctl[0] |= 0x09;
700                         modem_ctl[1] = 0x80;
701                         dbg("%s - flow control = CRTSCTS", __func__);
702                 } else {
703                         modem_ctl[0] &= ~0x7B;
704                         modem_ctl[0] |= 0x01;
705                         modem_ctl[1] |= 0x40;
706                         dbg("%s - flow control = NONE", __func__);
707                 }
708
709                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
710                                 __func__, modem_ctl[0], modem_ctl[1],
711                                 modem_ctl[2], modem_ctl[3]);
712                 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16);
713         }
714
715 }
716
717 static int cp210x_tiocmset (struct tty_struct *tty, struct file *file,
718                 unsigned int set, unsigned int clear)
719 {
720         struct usb_serial_port *port = tty->driver_data;
721         return cp210x_tiocmset_port(port, file, set, clear);
722 }
723
724 static int cp210x_tiocmset_port(struct usb_serial_port *port, struct file *file,
725                 unsigned int set, unsigned int clear)
726 {
727         unsigned int control = 0;
728
729         dbg("%s - port %d", __func__, port->number);
730
731         if (set & TIOCM_RTS) {
732                 control |= CONTROL_RTS;
733                 control |= CONTROL_WRITE_RTS;
734         }
735         if (set & TIOCM_DTR) {
736                 control |= CONTROL_DTR;
737                 control |= CONTROL_WRITE_DTR;
738         }
739         if (clear & TIOCM_RTS) {
740                 control &= ~CONTROL_RTS;
741                 control |= CONTROL_WRITE_RTS;
742         }
743         if (clear & TIOCM_DTR) {
744                 control &= ~CONTROL_DTR;
745                 control |= CONTROL_WRITE_DTR;
746         }
747
748         dbg("%s - control = 0x%.4x", __func__, control);
749
750         return cp210x_set_config(port, CP210X_SET_MHS, &control, 2);
751 }
752
753 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
754 {
755         if (on)
756                 cp210x_tiocmset_port(p, NULL,  TIOCM_DTR|TIOCM_RTS, 0);
757         else
758                 cp210x_tiocmset_port(p, NULL,  0, TIOCM_DTR|TIOCM_RTS);
759 }
760
761 static int cp210x_tiocmget (struct tty_struct *tty, struct file *file)
762 {
763         struct usb_serial_port *port = tty->driver_data;
764         unsigned int control;
765         int result;
766
767         dbg("%s - port %d", __func__, port->number);
768
769         cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1);
770
771         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
772                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
773                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
774                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
775                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
776                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
777
778         dbg("%s - control = 0x%.2x", __func__, control);
779
780         return result;
781 }
782
783 static int cp210x_carrier_raised(struct usb_serial_port *p)
784 {
785         unsigned int control;
786         cp210x_get_config(p, CP210X_GET_MDMSTS, &control, 1);
787         if (control & CONTROL_DCD)
788                 return 1;
789         return 0;
790 }
791
792 static void cp210x_break_ctl (struct tty_struct *tty, int break_state)
793 {
794         struct usb_serial_port *port = tty->driver_data;
795         unsigned int state;
796
797         dbg("%s - port %d", __func__, port->number);
798         if (break_state == 0)
799                 state = BREAK_OFF;
800         else
801                 state = BREAK_ON;
802         dbg("%s - turning break %s", __func__,
803                         state == BREAK_OFF ? "off" : "on");
804         cp210x_set_config(port, CP210X_SET_BREAK, &state, 2);
805 }
806
807 static int cp210x_startup(struct usb_serial *serial)
808 {
809         /* cp210x buffers behave strangely unless device is reset */
810         usb_reset_device(serial->dev);
811         return 0;
812 }
813
814 static void cp210x_disconnect(struct usb_serial *serial)
815 {
816         int i;
817
818         dbg("%s", __func__);
819
820         /* Stop reads and writes on all ports */
821         for (i = 0; i < serial->num_ports; ++i)
822                 cp210x_cleanup(serial->port[i]);
823 }
824
825 static int __init cp210x_init(void)
826 {
827         int retval;
828
829         retval = usb_serial_register(&cp210x_device);
830         if (retval)
831                 return retval; /* Failed to register */
832
833         retval = usb_register(&cp210x_driver);
834         if (retval) {
835                 /* Failed to register */
836                 usb_serial_deregister(&cp210x_device);
837                 return retval;
838         }
839
840         /* Success */
841         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
842                DRIVER_DESC "\n");
843         return 0;
844 }
845
846 static void __exit cp210x_exit(void)
847 {
848         usb_deregister(&cp210x_driver);
849         usb_serial_deregister(&cp210x_device);
850 }
851
852 module_init(cp210x_init);
853 module_exit(cp210x_exit);
854
855 MODULE_DESCRIPTION(DRIVER_DESC);
856 MODULE_VERSION(DRIVER_VERSION);
857 MODULE_LICENSE("GPL");
858
859 module_param(debug, bool, S_IRUGO | S_IWUSR);
860 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");