netfilter: fix description of expected checkentry return code on xt_target
[cascardo/linux.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, 0x81E8) }, /* Zephyr Bioharness */
95         { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
96         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
97         { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
98         { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demostration module */
99         { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesys ETRX2USB */
100         { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
101         { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
102         { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
103         { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
104         { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
105         { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
106         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
107         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
108         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
109         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
110         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
111         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
112         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
113         { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
114         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
115         { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
116         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
117         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
118         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
119         { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
120         { } /* Terminating Entry */
121 };
122
123 MODULE_DEVICE_TABLE(usb, id_table);
124
125 static struct usb_driver cp210x_driver = {
126         .name           = "cp210x",
127         .probe          = usb_serial_probe,
128         .disconnect     = usb_serial_disconnect,
129         .id_table       = id_table,
130         .no_dynamic_id  =       1,
131 };
132
133 static struct usb_serial_driver cp210x_device = {
134         .driver = {
135                 .owner =        THIS_MODULE,
136                 .name =         "cp210x",
137         },
138         .usb_driver             = &cp210x_driver,
139         .id_table               = id_table,
140         .num_ports              = 1,
141         .open                   = cp210x_open,
142         .close                  = cp210x_close,
143         .break_ctl              = cp210x_break_ctl,
144         .set_termios            = cp210x_set_termios,
145         .tiocmget               = cp210x_tiocmget,
146         .tiocmset               = cp210x_tiocmset,
147         .attach                 = cp210x_startup,
148         .disconnect             = cp210x_disconnect,
149         .dtr_rts                = cp210x_dtr_rts,
150         .carrier_raised         = cp210x_carrier_raised
151 };
152
153 /* Config request types */
154 #define REQTYPE_HOST_TO_DEVICE  0x41
155 #define REQTYPE_DEVICE_TO_HOST  0xc1
156
157 /* Config request codes */
158 #define CP210X_IFC_ENABLE       0x00
159 #define CP210X_SET_BAUDDIV      0x01
160 #define CP210X_GET_BAUDDIV      0x02
161 #define CP210X_SET_LINE_CTL     0x03
162 #define CP210X_GET_LINE_CTL     0x04
163 #define CP210X_SET_BREAK        0x05
164 #define CP210X_IMM_CHAR         0x06
165 #define CP210X_SET_MHS          0x07
166 #define CP210X_GET_MDMSTS       0x08
167 #define CP210X_SET_XON          0x09
168 #define CP210X_SET_XOFF         0x0A
169 #define CP210X_SET_EVENTMASK    0x0B
170 #define CP210X_GET_EVENTMASK    0x0C
171 #define CP210X_SET_CHAR         0x0D
172 #define CP210X_GET_CHARS        0x0E
173 #define CP210X_GET_PROPS        0x0F
174 #define CP210X_GET_COMM_STATUS  0x10
175 #define CP210X_RESET            0x11
176 #define CP210X_PURGE            0x12
177 #define CP210X_SET_FLOW         0x13
178 #define CP210X_GET_FLOW         0x14
179 #define CP210X_EMBED_EVENTS     0x15
180 #define CP210X_GET_EVENTSTATE   0x16
181 #define CP210X_SET_CHARS        0x19
182
183 /* CP210X_IFC_ENABLE */
184 #define UART_ENABLE             0x0001
185 #define UART_DISABLE            0x0000
186
187 /* CP210X_(SET|GET)_BAUDDIV */
188 #define BAUD_RATE_GEN_FREQ      0x384000
189
190 /* CP210X_(SET|GET)_LINE_CTL */
191 #define BITS_DATA_MASK          0X0f00
192 #define BITS_DATA_5             0X0500
193 #define BITS_DATA_6             0X0600
194 #define BITS_DATA_7             0X0700
195 #define BITS_DATA_8             0X0800
196 #define BITS_DATA_9             0X0900
197
198 #define BITS_PARITY_MASK        0x00f0
199 #define BITS_PARITY_NONE        0x0000
200 #define BITS_PARITY_ODD         0x0010
201 #define BITS_PARITY_EVEN        0x0020
202 #define BITS_PARITY_MARK        0x0030
203 #define BITS_PARITY_SPACE       0x0040
204
205 #define BITS_STOP_MASK          0x000f
206 #define BITS_STOP_1             0x0000
207 #define BITS_STOP_1_5           0x0001
208 #define BITS_STOP_2             0x0002
209
210 /* CP210X_SET_BREAK */
211 #define BREAK_ON                0x0000
212 #define BREAK_OFF               0x0001
213
214 /* CP210X_(SET_MHS|GET_MDMSTS) */
215 #define CONTROL_DTR             0x0001
216 #define CONTROL_RTS             0x0002
217 #define CONTROL_CTS             0x0010
218 #define CONTROL_DSR             0x0020
219 #define CONTROL_RING            0x0040
220 #define CONTROL_DCD             0x0080
221 #define CONTROL_WRITE_DTR       0x0100
222 #define CONTROL_WRITE_RTS       0x0200
223
224 /*
225  * cp210x_get_config
226  * Reads from the CP210x configuration registers
227  * 'size' is specified in bytes.
228  * 'data' is a pointer to a pre-allocated array of integers large
229  * enough to hold 'size' bytes (with 4 bytes to each integer)
230  */
231 static int cp210x_get_config(struct usb_serial_port *port, u8 request,
232                 unsigned int *data, int size)
233 {
234         struct usb_serial *serial = port->serial;
235         __le32 *buf;
236         int result, i, length;
237
238         /* Number of integers required to contain the array */
239         length = (((size - 1) | 3) + 1)/4;
240
241         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
242         if (!buf) {
243                 dev_err(&port->dev, "%s - out of memory.\n", __func__);
244                 return -ENOMEM;
245         }
246
247         /* Issue the request, attempting to read 'size' bytes */
248         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
249                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
250                                 0, buf, size, 300);
251
252         /* Convert data into an array of integers */
253         for (i = 0; i < length; i++)
254                 data[i] = le32_to_cpu(buf[i]);
255
256         kfree(buf);
257
258         if (result != size) {
259                 dbg("%s - Unable to send config request, "
260                                 "request=0x%x size=%d result=%d\n",
261                                 __func__, request, size, result);
262                 return -EPROTO;
263         }
264
265         return 0;
266 }
267
268 /*
269  * cp210x_set_config
270  * Writes to the CP210x configuration registers
271  * Values less than 16 bits wide are sent directly
272  * 'size' is specified in bytes.
273  */
274 static int cp210x_set_config(struct usb_serial_port *port, u8 request,
275                 unsigned int *data, int size)
276 {
277         struct usb_serial *serial = port->serial;
278         __le32 *buf;
279         int result, i, length;
280
281         /* Number of integers required to contain the array */
282         length = (((size - 1) | 3) + 1)/4;
283
284         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
285         if (!buf) {
286                 dev_err(&port->dev, "%s - out of memory.\n",
287                                 __func__);
288                 return -ENOMEM;
289         }
290
291         /* Array of integers into bytes */
292         for (i = 0; i < length; i++)
293                 buf[i] = cpu_to_le32(data[i]);
294
295         if (size > 2) {
296                 result = usb_control_msg(serial->dev,
297                                 usb_sndctrlpipe(serial->dev, 0),
298                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
299                                 0, buf, size, 300);
300         } else {
301                 result = usb_control_msg(serial->dev,
302                                 usb_sndctrlpipe(serial->dev, 0),
303                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
304                                 0, NULL, 0, 300);
305         }
306
307         kfree(buf);
308
309         if ((size > 2 && result != size) || result < 0) {
310                 dbg("%s - Unable to send request, "
311                                 "request=0x%x size=%d result=%d\n",
312                                 __func__, request, size, result);
313                 return -EPROTO;
314         }
315
316         return 0;
317 }
318
319 /*
320  * cp210x_set_config_single
321  * Convenience function for calling cp210x_set_config on single data values
322  * without requiring an integer pointer
323  */
324 static inline int cp210x_set_config_single(struct usb_serial_port *port,
325                 u8 request, unsigned int data)
326 {
327         return cp210x_set_config(port, request, &data, 2);
328 }
329
330 /*
331  * cp210x_quantise_baudrate
332  * Quantises the baud rate as per AN205 Table 1
333  */
334 static unsigned int cp210x_quantise_baudrate(unsigned int baud) {
335         if      (baud <= 56)       baud = 0;
336         else if (baud <= 300)      baud = 300;
337         else if (baud <= 600)      baud = 600;
338         else if (baud <= 1200)     baud = 1200;
339         else if (baud <= 1800)     baud = 1800;
340         else if (baud <= 2400)     baud = 2400;
341         else if (baud <= 4000)     baud = 4000;
342         else if (baud <= 4803)     baud = 4800;
343         else if (baud <= 7207)     baud = 7200;
344         else if (baud <= 9612)     baud = 9600;
345         else if (baud <= 14428)    baud = 14400;
346         else if (baud <= 16062)    baud = 16000;
347         else if (baud <= 19250)    baud = 19200;
348         else if (baud <= 28912)    baud = 28800;
349         else if (baud <= 38601)    baud = 38400;
350         else if (baud <= 51558)    baud = 51200;
351         else if (baud <= 56280)    baud = 56000;
352         else if (baud <= 58053)    baud = 57600;
353         else if (baud <= 64111)    baud = 64000;
354         else if (baud <= 77608)    baud = 76800;
355         else if (baud <= 117028)   baud = 115200;
356         else if (baud <= 129347)   baud = 128000;
357         else if (baud <= 156868)   baud = 153600;
358         else if (baud <= 237832)   baud = 230400;
359         else if (baud <= 254234)   baud = 250000;
360         else if (baud <= 273066)   baud = 256000;
361         else if (baud <= 491520)   baud = 460800;
362         else if (baud <= 567138)   baud = 500000;
363         else if (baud <= 670254)   baud = 576000;
364         else if (baud <= 1053257)  baud = 921600;
365         else if (baud <= 1474560)  baud = 1228800;
366         else if (baud <= 2457600)  baud = 1843200;
367         else                       baud = 3686400;
368         return baud;
369 }
370
371 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
372 {
373         struct usb_serial *serial = port->serial;
374         int result;
375
376         dbg("%s - port %d", __func__, port->number);
377
378         if (cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_ENABLE)) {
379                 dev_err(&port->dev, "%s - Unable to enable UART\n",
380                                 __func__);
381                 return -EPROTO;
382         }
383
384         /* Start reading from the device */
385         usb_fill_bulk_urb(port->read_urb, serial->dev,
386                         usb_rcvbulkpipe(serial->dev,
387                         port->bulk_in_endpointAddress),
388                         port->read_urb->transfer_buffer,
389                         port->read_urb->transfer_buffer_length,
390                         serial->type->read_bulk_callback,
391                         port);
392         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
393         if (result) {
394                 dev_err(&port->dev, "%s - failed resubmitting read urb, "
395                                 "error %d\n", __func__, result);
396                 return result;
397         }
398
399         /* Configure the termios structure */
400         cp210x_get_termios(tty, port);
401         return 0;
402 }
403
404 static void cp210x_cleanup(struct usb_serial_port *port)
405 {
406         struct usb_serial *serial = port->serial;
407
408         dbg("%s - port %d", __func__, port->number);
409
410         if (serial->dev) {
411                 /* shutdown any bulk reads that might be going on */
412                 if (serial->num_bulk_out)
413                         usb_kill_urb(port->write_urb);
414                 if (serial->num_bulk_in)
415                         usb_kill_urb(port->read_urb);
416         }
417 }
418
419 static void cp210x_close(struct usb_serial_port *port)
420 {
421         dbg("%s - port %d", __func__, port->number);
422
423         /* shutdown our urbs */
424         dbg("%s - shutting down urbs", __func__);
425         usb_kill_urb(port->write_urb);
426         usb_kill_urb(port->read_urb);
427
428         mutex_lock(&port->serial->disc_mutex);
429         if (!port->serial->disconnected)
430                 cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE);
431         mutex_unlock(&port->serial->disc_mutex);
432 }
433
434 /*
435  * cp210x_get_termios
436  * Reads the baud rate, data bits, parity, stop bits and flow control mode
437  * from the device, corrects any unsupported values, and configures the
438  * termios structure to reflect the state of the device
439  */
440 static void cp210x_get_termios(struct tty_struct *tty,
441         struct usb_serial_port *port)
442 {
443         unsigned int baud;
444
445         if (tty) {
446                 cp210x_get_termios_port(tty->driver_data,
447                         &tty->termios->c_cflag, &baud);
448                 tty_encode_baud_rate(tty, baud, baud);
449         }
450
451         else {
452                 unsigned int cflag;
453                 cflag = 0;
454                 cp210x_get_termios_port(port, &cflag, &baud);
455         }
456 }
457
458 /*
459  * cp210x_get_termios_port
460  * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
461  */
462 static void cp210x_get_termios_port(struct usb_serial_port *port,
463         unsigned int *cflagp, unsigned int *baudp)
464 {
465         unsigned int cflag, modem_ctl[4];
466         unsigned int baud;
467         unsigned int bits;
468
469         dbg("%s - port %d", __func__, port->number);
470
471         cp210x_get_config(port, CP210X_GET_BAUDDIV, &baud, 2);
472         /* Convert to baudrate */
473         if (baud)
474                 baud = cp210x_quantise_baudrate((BAUD_RATE_GEN_FREQ + baud/2)/ baud);
475
476         dbg("%s - baud rate = %d", __func__, baud);
477         *baudp = baud;
478
479         cflag = *cflagp;
480
481         cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
482         cflag &= ~CSIZE;
483         switch (bits & BITS_DATA_MASK) {
484         case BITS_DATA_5:
485                 dbg("%s - data bits = 5", __func__);
486                 cflag |= CS5;
487                 break;
488         case BITS_DATA_6:
489                 dbg("%s - data bits = 6", __func__);
490                 cflag |= CS6;
491                 break;
492         case BITS_DATA_7:
493                 dbg("%s - data bits = 7", __func__);
494                 cflag |= CS7;
495                 break;
496         case BITS_DATA_8:
497                 dbg("%s - data bits = 8", __func__);
498                 cflag |= CS8;
499                 break;
500         case BITS_DATA_9:
501                 dbg("%s - data bits = 9 (not supported, using 8 data bits)",
502                                                                 __func__);
503                 cflag |= CS8;
504                 bits &= ~BITS_DATA_MASK;
505                 bits |= BITS_DATA_8;
506                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
507                 break;
508         default:
509                 dbg("%s - Unknown number of data bits, using 8", __func__);
510                 cflag |= CS8;
511                 bits &= ~BITS_DATA_MASK;
512                 bits |= BITS_DATA_8;
513                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
514                 break;
515         }
516
517         switch (bits & BITS_PARITY_MASK) {
518         case BITS_PARITY_NONE:
519                 dbg("%s - parity = NONE", __func__);
520                 cflag &= ~PARENB;
521                 break;
522         case BITS_PARITY_ODD:
523                 dbg("%s - parity = ODD", __func__);
524                 cflag |= (PARENB|PARODD);
525                 break;
526         case BITS_PARITY_EVEN:
527                 dbg("%s - parity = EVEN", __func__);
528                 cflag &= ~PARODD;
529                 cflag |= PARENB;
530                 break;
531         case BITS_PARITY_MARK:
532                 dbg("%s - parity = MARK (not supported, disabling parity)",
533                                 __func__);
534                 cflag &= ~PARENB;
535                 bits &= ~BITS_PARITY_MASK;
536                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
537                 break;
538         case BITS_PARITY_SPACE:
539                 dbg("%s - parity = SPACE (not supported, disabling parity)",
540                                 __func__);
541                 cflag &= ~PARENB;
542                 bits &= ~BITS_PARITY_MASK;
543                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
544                 break;
545         default:
546                 dbg("%s - Unknown parity mode, disabling parity", __func__);
547                 cflag &= ~PARENB;
548                 bits &= ~BITS_PARITY_MASK;
549                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
550                 break;
551         }
552
553         cflag &= ~CSTOPB;
554         switch (bits & BITS_STOP_MASK) {
555         case BITS_STOP_1:
556                 dbg("%s - stop bits = 1", __func__);
557                 break;
558         case BITS_STOP_1_5:
559                 dbg("%s - stop bits = 1.5 (not supported, using 1 stop bit)",
560                                                                 __func__);
561                 bits &= ~BITS_STOP_MASK;
562                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
563                 break;
564         case BITS_STOP_2:
565                 dbg("%s - stop bits = 2", __func__);
566                 cflag |= CSTOPB;
567                 break;
568         default:
569                 dbg("%s - Unknown number of stop bits, using 1 stop bit",
570                                                                 __func__);
571                 bits &= ~BITS_STOP_MASK;
572                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
573                 break;
574         }
575
576         cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
577         if (modem_ctl[0] & 0x0008) {
578                 dbg("%s - flow control = CRTSCTS", __func__);
579                 cflag |= CRTSCTS;
580         } else {
581                 dbg("%s - flow control = NONE", __func__);
582                 cflag &= ~CRTSCTS;
583         }
584
585         *cflagp = cflag;
586 }
587
588 static void cp210x_set_termios(struct tty_struct *tty,
589                 struct usb_serial_port *port, struct ktermios *old_termios)
590 {
591         unsigned int cflag, old_cflag;
592         unsigned int baud = 0, bits;
593         unsigned int modem_ctl[4];
594
595         dbg("%s - port %d", __func__, port->number);
596
597         if (!tty)
598                 return;
599
600         tty->termios->c_cflag &= ~CMSPAR;
601         cflag = tty->termios->c_cflag;
602         old_cflag = old_termios->c_cflag;
603         baud = cp210x_quantise_baudrate(tty_get_baud_rate(tty));
604
605         /* If the baud rate is to be updated*/
606         if (baud != tty_termios_baud_rate(old_termios) && baud != 0) {
607                 dbg("%s - Setting baud rate to %d baud", __func__,
608                                 baud);
609                 if (cp210x_set_config_single(port, CP210X_SET_BAUDDIV,
610                                         ((BAUD_RATE_GEN_FREQ + baud/2) / baud))) {
611                         dbg("Baud rate requested not supported by device");
612                         baud = tty_termios_baud_rate(old_termios);
613                 }
614         }
615         /* Report back the resulting baud rate */
616         tty_encode_baud_rate(tty, baud, baud);
617
618         /* If the number of data bits is to be updated */
619         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
620                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
621                 bits &= ~BITS_DATA_MASK;
622                 switch (cflag & CSIZE) {
623                 case CS5:
624                         bits |= BITS_DATA_5;
625                         dbg("%s - data bits = 5", __func__);
626                         break;
627                 case CS6:
628                         bits |= BITS_DATA_6;
629                         dbg("%s - data bits = 6", __func__);
630                         break;
631                 case CS7:
632                         bits |= BITS_DATA_7;
633                         dbg("%s - data bits = 7", __func__);
634                         break;
635                 case CS8:
636                         bits |= BITS_DATA_8;
637                         dbg("%s - data bits = 8", __func__);
638                         break;
639                 /*case CS9:
640                         bits |= BITS_DATA_9;
641                         dbg("%s - data bits = 9", __func__);
642                         break;*/
643                 default:
644                         dbg("cp210x driver does not "
645                                         "support the number of bits requested,"
646                                         " using 8 bit mode\n");
647                                 bits |= BITS_DATA_8;
648                                 break;
649                 }
650                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
651                         dbg("Number of data bits requested "
652                                         "not supported by device\n");
653         }
654
655         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
656                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
657                 bits &= ~BITS_PARITY_MASK;
658                 if (cflag & PARENB) {
659                         if (cflag & PARODD) {
660                                 bits |= BITS_PARITY_ODD;
661                                 dbg("%s - parity = ODD", __func__);
662                         } else {
663                                 bits |= BITS_PARITY_EVEN;
664                                 dbg("%s - parity = EVEN", __func__);
665                         }
666                 }
667                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
668                         dbg("Parity mode not supported "
669                                         "by device\n");
670         }
671
672         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
673                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
674                 bits &= ~BITS_STOP_MASK;
675                 if (cflag & CSTOPB) {
676                         bits |= BITS_STOP_2;
677                         dbg("%s - stop bits = 2", __func__);
678                 } else {
679                         bits |= BITS_STOP_1;
680                         dbg("%s - stop bits = 1", __func__);
681                 }
682                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
683                         dbg("Number of stop bits requested "
684                                         "not supported by device\n");
685         }
686
687         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
688                 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
689                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
690                                 __func__, modem_ctl[0], modem_ctl[1],
691                                 modem_ctl[2], modem_ctl[3]);
692
693                 if (cflag & CRTSCTS) {
694                         modem_ctl[0] &= ~0x7B;
695                         modem_ctl[0] |= 0x09;
696                         modem_ctl[1] = 0x80;
697                         dbg("%s - flow control = CRTSCTS", __func__);
698                 } else {
699                         modem_ctl[0] &= ~0x7B;
700                         modem_ctl[0] |= 0x01;
701                         modem_ctl[1] |= 0x40;
702                         dbg("%s - flow control = NONE", __func__);
703                 }
704
705                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
706                                 __func__, modem_ctl[0], modem_ctl[1],
707                                 modem_ctl[2], modem_ctl[3]);
708                 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16);
709         }
710
711 }
712
713 static int cp210x_tiocmset (struct tty_struct *tty, struct file *file,
714                 unsigned int set, unsigned int clear)
715 {
716         struct usb_serial_port *port = tty->driver_data;
717         return cp210x_tiocmset_port(port, file, set, clear);
718 }
719
720 static int cp210x_tiocmset_port(struct usb_serial_port *port, struct file *file,
721                 unsigned int set, unsigned int clear)
722 {
723         unsigned int control = 0;
724
725         dbg("%s - port %d", __func__, port->number);
726
727         if (set & TIOCM_RTS) {
728                 control |= CONTROL_RTS;
729                 control |= CONTROL_WRITE_RTS;
730         }
731         if (set & TIOCM_DTR) {
732                 control |= CONTROL_DTR;
733                 control |= CONTROL_WRITE_DTR;
734         }
735         if (clear & TIOCM_RTS) {
736                 control &= ~CONTROL_RTS;
737                 control |= CONTROL_WRITE_RTS;
738         }
739         if (clear & TIOCM_DTR) {
740                 control &= ~CONTROL_DTR;
741                 control |= CONTROL_WRITE_DTR;
742         }
743
744         dbg("%s - control = 0x%.4x", __func__, control);
745
746         return cp210x_set_config(port, CP210X_SET_MHS, &control, 2);
747 }
748
749 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
750 {
751         if (on)
752                 cp210x_tiocmset_port(p, NULL,  TIOCM_DTR|TIOCM_RTS, 0);
753         else
754                 cp210x_tiocmset_port(p, NULL,  0, TIOCM_DTR|TIOCM_RTS);
755 }
756
757 static int cp210x_tiocmget (struct tty_struct *tty, struct file *file)
758 {
759         struct usb_serial_port *port = tty->driver_data;
760         unsigned int control;
761         int result;
762
763         dbg("%s - port %d", __func__, port->number);
764
765         cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1);
766
767         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
768                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
769                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
770                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
771                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
772                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
773
774         dbg("%s - control = 0x%.2x", __func__, control);
775
776         return result;
777 }
778
779 static int cp210x_carrier_raised(struct usb_serial_port *p)
780 {
781         unsigned int control;
782         cp210x_get_config(p, CP210X_GET_MDMSTS, &control, 1);
783         if (control & CONTROL_DCD)
784                 return 1;
785         return 0;
786 }
787
788 static void cp210x_break_ctl (struct tty_struct *tty, int break_state)
789 {
790         struct usb_serial_port *port = tty->driver_data;
791         unsigned int state;
792
793         dbg("%s - port %d", __func__, port->number);
794         if (break_state == 0)
795                 state = BREAK_OFF;
796         else
797                 state = BREAK_ON;
798         dbg("%s - turning break %s", __func__,
799                         state == BREAK_OFF ? "off" : "on");
800         cp210x_set_config(port, CP210X_SET_BREAK, &state, 2);
801 }
802
803 static int cp210x_startup(struct usb_serial *serial)
804 {
805         /* cp210x buffers behave strangely unless device is reset */
806         usb_reset_device(serial->dev);
807         return 0;
808 }
809
810 static void cp210x_disconnect(struct usb_serial *serial)
811 {
812         int i;
813
814         dbg("%s", __func__);
815
816         /* Stop reads and writes on all ports */
817         for (i = 0; i < serial->num_ports; ++i)
818                 cp210x_cleanup(serial->port[i]);
819 }
820
821 static int __init cp210x_init(void)
822 {
823         int retval;
824
825         retval = usb_serial_register(&cp210x_device);
826         if (retval)
827                 return retval; /* Failed to register */
828
829         retval = usb_register(&cp210x_driver);
830         if (retval) {
831                 /* Failed to register */
832                 usb_serial_deregister(&cp210x_device);
833                 return retval;
834         }
835
836         /* Success */
837         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
838                DRIVER_DESC "\n");
839         return 0;
840 }
841
842 static void __exit cp210x_exit(void)
843 {
844         usb_deregister(&cp210x_driver);
845         usb_serial_deregister(&cp210x_device);
846 }
847
848 module_init(cp210x_init);
849 module_exit(cp210x_exit);
850
851 MODULE_DESCRIPTION(DRIVER_DESC);
852 MODULE_VERSION(DRIVER_VERSION);
853 MODULE_LICENSE("GPL");
854
855 module_param(debug, bool, S_IRUGO | S_IWUSR);
856 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");