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_close(struct usb_serial_port *);
38 static void cp210x_get_termios(struct tty_struct *,
39 struct usb_serial_port *port);
40 static void cp210x_get_termios_port(struct usb_serial_port *port,
41 unsigned int *cflagp, unsigned int *baudp);
42 static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *,
43 struct ktermios *);
44 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
45 struct ktermios*);
46 static int cp210x_tiocmget(struct tty_struct *);
47 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
48 static int cp210x_tiocmset_port(struct usb_serial_port *port,
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_dtr_rts(struct usb_serial_port *p, int on);
53
54 static bool debug;
55
56 static const struct usb_device_id id_table[] = {
57 { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */
58 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
59 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
60 { USB_DEVICE(0x0489, 0xE003) }, /* 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(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
65 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
66 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
67 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
68 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
69 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
70 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
71 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
72 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
73 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
74 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
75 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
76 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
77 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
78 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
79 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
80 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
81 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
82 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
83 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
84 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
85 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
86 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
87 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
88 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
89 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
90 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
91 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
92 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
93 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
94 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
95 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
96 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
97 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
98 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
99 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
100 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
101 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
102 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
103 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
104 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
105 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
106 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
107 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
108 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
109 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
110 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
111 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
112 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
113 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
114 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
115 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
116 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
117 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
118 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
119 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
120 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
121 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
122 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
123 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
124 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
125 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
126 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
127 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
128 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
129 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
130 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
131 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
132 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
133 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
134 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
135 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
136 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
137 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
138 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
139 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
140 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
141 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
142 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
143 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
144 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
145 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
146 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
147 { } /* Terminating Entry */
148 };
149
150 MODULE_DEVICE_TABLE(usb, id_table);
151
152 static struct usb_driver cp210x_driver = {
153 .name = "cp210x",
154 .probe = usb_serial_probe,
155 .disconnect = usb_serial_disconnect,
156 .id_table = id_table,
157 .no_dynamic_id = 1,
158 };
159
160 static struct usb_serial_driver cp210x_device = {
161 .driver = {
162 .owner = THIS_MODULE,
163 .name = "cp210x",
164 },
165 .usb_driver = &cp210x_driver,
166 .id_table = id_table,
167 .num_ports = 1,
168 .bulk_in_size = 256,
169 .bulk_out_size = 256,
170 .open = cp210x_open,
171 .close = cp210x_close,
172 .break_ctl = cp210x_break_ctl,
173 .set_termios = cp210x_set_termios,
174 .tiocmget = cp210x_tiocmget,
175 .tiocmset = cp210x_tiocmset,
176 .attach = cp210x_startup,
177 .dtr_rts = cp210x_dtr_rts
178 };
179
180 /* Config request types */
181 #define REQTYPE_HOST_TO_DEVICE 0x41
182 #define REQTYPE_DEVICE_TO_HOST 0xc1
183
184 /* Config request codes */
185 #define CP210X_IFC_ENABLE 0x00
186 #define CP210X_SET_BAUDDIV 0x01
187 #define CP210X_GET_BAUDDIV 0x02
188 #define CP210X_SET_LINE_CTL 0x03
189 #define CP210X_GET_LINE_CTL 0x04
190 #define CP210X_SET_BREAK 0x05
191 #define CP210X_IMM_CHAR 0x06
192 #define CP210X_SET_MHS 0x07
193 #define CP210X_GET_MDMSTS 0x08
194 #define CP210X_SET_XON 0x09
195 #define CP210X_SET_XOFF 0x0A
196 #define CP210X_SET_EVENTMASK 0x0B
197 #define CP210X_GET_EVENTMASK 0x0C
198 #define CP210X_SET_CHAR 0x0D
199 #define CP210X_GET_CHARS 0x0E
200 #define CP210X_GET_PROPS 0x0F
201 #define CP210X_GET_COMM_STATUS 0x10
202 #define CP210X_RESET 0x11
203 #define CP210X_PURGE 0x12
204 #define CP210X_SET_FLOW 0x13
205 #define CP210X_GET_FLOW 0x14
206 #define CP210X_EMBED_EVENTS 0x15
207 #define CP210X_GET_EVENTSTATE 0x16
208 #define CP210X_SET_CHARS 0x19
209 #define CP210X_GET_BAUDRATE 0x1D
210 #define CP210X_SET_BAUDRATE 0x1E
211
212 /* CP210X_IFC_ENABLE */
213 #define UART_ENABLE 0x0001
214 #define UART_DISABLE 0x0000
215
216 /* CP210X_(SET|GET)_BAUDDIV */
217 #define BAUD_RATE_GEN_FREQ 0x384000
218
219 /* CP210X_(SET|GET)_LINE_CTL */
220 #define BITS_DATA_MASK 0X0f00
221 #define BITS_DATA_5 0X0500
222 #define BITS_DATA_6 0X0600
223 #define BITS_DATA_7 0X0700
224 #define BITS_DATA_8 0X0800
225 #define BITS_DATA_9 0X0900
226
227 #define BITS_PARITY_MASK 0x00f0
228 #define BITS_PARITY_NONE 0x0000
229 #define BITS_PARITY_ODD 0x0010
230 #define BITS_PARITY_EVEN 0x0020
231 #define BITS_PARITY_MARK 0x0030
232 #define BITS_PARITY_SPACE 0x0040
233
234 #define BITS_STOP_MASK 0x000f
235 #define BITS_STOP_1 0x0000
236 #define BITS_STOP_1_5 0x0001
237 #define BITS_STOP_2 0x0002
238
239 /* CP210X_SET_BREAK */
240 #define BREAK_ON 0x0001
241 #define BREAK_OFF 0x0000
242
243 /* CP210X_(SET_MHS|GET_MDMSTS) */
244 #define CONTROL_DTR 0x0001
245 #define CONTROL_RTS 0x0002
246 #define CONTROL_CTS 0x0010
247 #define CONTROL_DSR 0x0020
248 #define CONTROL_RING 0x0040
249 #define CONTROL_DCD 0x0080
250 #define CONTROL_WRITE_DTR 0x0100
251 #define CONTROL_WRITE_RTS 0x0200
252
253 /*
254 * cp210x_get_config
255 * Reads from the CP210x configuration registers
256 * 'size' is specified in bytes.
257 * 'data' is a pointer to a pre-allocated array of integers large
258 * enough to hold 'size' bytes (with 4 bytes to each integer)
259 */
cp210x_get_config(struct usb_serial_port * port,u8 request,unsigned int * data,int size)260 static int cp210x_get_config(struct usb_serial_port *port, u8 request,
261 unsigned int *data, int size)
262 {
263 struct usb_serial *serial = port->serial;
264 __le32 *buf;
265 int result, i, length;
266
267 /* Number of integers required to contain the array */
268 length = (((size - 1) | 3) + 1)/4;
269
270 buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
271 if (!buf) {
272 dev_err(&port->dev, "%s - out of memory.\n", __func__);
273 return -ENOMEM;
274 }
275
276 /* Issue the request, attempting to read 'size' bytes */
277 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
278 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
279 0, buf, size, 300);
280
281 /* Convert data into an array of integers */
282 for (i = 0; i < length; i++)
283 data[i] = le32_to_cpu(buf[i]);
284
285 kfree(buf);
286
287 if (result != size) {
288 dbg("%s - Unable to send config request, "
289 "request=0x%x size=%d result=%d\n",
290 __func__, request, size, result);
291 if (result > 0)
292 result = -EPROTO;
293
294 return result;
295 }
296
297 return 0;
298 }
299
300 /*
301 * cp210x_set_config
302 * Writes to the CP210x configuration registers
303 * Values less than 16 bits wide are sent directly
304 * 'size' is specified in bytes.
305 */
cp210x_set_config(struct usb_serial_port * port,u8 request,unsigned int * data,int size)306 static int cp210x_set_config(struct usb_serial_port *port, u8 request,
307 unsigned int *data, int size)
308 {
309 struct usb_serial *serial = port->serial;
310 __le32 *buf;
311 int result, i, length;
312
313 /* Number of integers required to contain the array */
314 length = (((size - 1) | 3) + 1)/4;
315
316 buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
317 if (!buf) {
318 dev_err(&port->dev, "%s - out of memory.\n",
319 __func__);
320 return -ENOMEM;
321 }
322
323 /* Array of integers into bytes */
324 for (i = 0; i < length; i++)
325 buf[i] = cpu_to_le32(data[i]);
326
327 if (size > 2) {
328 result = usb_control_msg(serial->dev,
329 usb_sndctrlpipe(serial->dev, 0),
330 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
331 0, buf, size, 300);
332 } else {
333 result = usb_control_msg(serial->dev,
334 usb_sndctrlpipe(serial->dev, 0),
335 request, REQTYPE_HOST_TO_DEVICE, data[0],
336 0, NULL, 0, 300);
337 }
338
339 kfree(buf);
340
341 if ((size > 2 && result != size) || result < 0) {
342 dbg("%s - Unable to send request, "
343 "request=0x%x size=%d result=%d\n",
344 __func__, request, size, result);
345 if (result > 0)
346 result = -EPROTO;
347
348 return result;
349 }
350
351 return 0;
352 }
353
354 /*
355 * cp210x_set_config_single
356 * Convenience function for calling cp210x_set_config on single data values
357 * without requiring an integer pointer
358 */
cp210x_set_config_single(struct usb_serial_port * port,u8 request,unsigned int data)359 static inline int cp210x_set_config_single(struct usb_serial_port *port,
360 u8 request, unsigned int data)
361 {
362 return cp210x_set_config(port, request, &data, 2);
363 }
364
365 /*
366 * cp210x_quantise_baudrate
367 * Quantises the baud rate as per AN205 Table 1
368 */
cp210x_quantise_baudrate(unsigned int baud)369 static unsigned int cp210x_quantise_baudrate(unsigned int baud) {
370 if (baud <= 300)
371 baud = 300;
372 else if (baud <= 600) baud = 600;
373 else if (baud <= 1200) baud = 1200;
374 else if (baud <= 1800) baud = 1800;
375 else if (baud <= 2400) baud = 2400;
376 else if (baud <= 4000) baud = 4000;
377 else if (baud <= 4803) baud = 4800;
378 else if (baud <= 7207) baud = 7200;
379 else if (baud <= 9612) baud = 9600;
380 else if (baud <= 14428) baud = 14400;
381 else if (baud <= 16062) baud = 16000;
382 else if (baud <= 19250) baud = 19200;
383 else if (baud <= 28912) baud = 28800;
384 else if (baud <= 38601) baud = 38400;
385 else if (baud <= 51558) baud = 51200;
386 else if (baud <= 56280) baud = 56000;
387 else if (baud <= 58053) baud = 57600;
388 else if (baud <= 64111) baud = 64000;
389 else if (baud <= 77608) baud = 76800;
390 else if (baud <= 117028) baud = 115200;
391 else if (baud <= 129347) baud = 128000;
392 else if (baud <= 156868) baud = 153600;
393 else if (baud <= 237832) baud = 230400;
394 else if (baud <= 254234) baud = 250000;
395 else if (baud <= 273066) baud = 256000;
396 else if (baud <= 491520) baud = 460800;
397 else if (baud <= 567138) baud = 500000;
398 else if (baud <= 670254) baud = 576000;
399 else if (baud < 1000000)
400 baud = 921600;
401 else if (baud > 2000000)
402 baud = 2000000;
403 return baud;
404 }
405
cp210x_open(struct tty_struct * tty,struct usb_serial_port * port)406 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
407 {
408 int result;
409
410 dbg("%s - port %d", __func__, port->number);
411
412 result = cp210x_set_config_single(port, CP210X_IFC_ENABLE,
413 UART_ENABLE);
414 if (result) {
415 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
416 return result;
417 }
418
419 /* Configure the termios structure */
420 cp210x_get_termios(tty, port);
421
422 /* The baud rate must be initialised on cp2104 */
423 if (tty)
424 cp210x_change_speed(tty, port, NULL);
425
426 return usb_serial_generic_open(tty, port);
427 }
428
cp210x_close(struct usb_serial_port * port)429 static void cp210x_close(struct usb_serial_port *port)
430 {
431 dbg("%s - port %d", __func__, port->number);
432
433 usb_serial_generic_close(port);
434
435 mutex_lock(&port->serial->disc_mutex);
436 if (!port->serial->disconnected)
437 cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE);
438 mutex_unlock(&port->serial->disc_mutex);
439 }
440
441 /*
442 * cp210x_get_termios
443 * Reads the baud rate, data bits, parity, stop bits and flow control mode
444 * from the device, corrects any unsupported values, and configures the
445 * termios structure to reflect the state of the device
446 */
cp210x_get_termios(struct tty_struct * tty,struct usb_serial_port * port)447 static void cp210x_get_termios(struct tty_struct *tty,
448 struct usb_serial_port *port)
449 {
450 unsigned int baud;
451
452 if (tty) {
453 cp210x_get_termios_port(tty->driver_data,
454 &tty->termios->c_cflag, &baud);
455 tty_encode_baud_rate(tty, baud, baud);
456 }
457
458 else {
459 unsigned int cflag;
460 cflag = 0;
461 cp210x_get_termios_port(port, &cflag, &baud);
462 }
463 }
464
465 /*
466 * cp210x_get_termios_port
467 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
468 */
cp210x_get_termios_port(struct usb_serial_port * port,unsigned int * cflagp,unsigned int * baudp)469 static void cp210x_get_termios_port(struct usb_serial_port *port,
470 unsigned int *cflagp, unsigned int *baudp)
471 {
472 unsigned int cflag, modem_ctl[4];
473 unsigned int baud;
474 unsigned int bits;
475
476 dbg("%s - port %d", __func__, port->number);
477
478 cp210x_get_config(port, CP210X_GET_BAUDRATE, &baud, 4);
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", __func__);
537 cflag |= (PARENB|PARODD|CMSPAR);
538 break;
539 case BITS_PARITY_SPACE:
540 dbg("%s - parity = SPACE", __func__);
541 cflag &= ~PARODD;
542 cflag |= (PARENB|CMSPAR);
543 break;
544 default:
545 dbg("%s - Unknown parity mode, disabling parity", __func__);
546 cflag &= ~PARENB;
547 bits &= ~BITS_PARITY_MASK;
548 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
549 break;
550 }
551
552 cflag &= ~CSTOPB;
553 switch (bits & BITS_STOP_MASK) {
554 case BITS_STOP_1:
555 dbg("%s - stop bits = 1", __func__);
556 break;
557 case BITS_STOP_1_5:
558 dbg("%s - stop bits = 1.5 (not supported, using 1 stop bit)",
559 __func__);
560 bits &= ~BITS_STOP_MASK;
561 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
562 break;
563 case BITS_STOP_2:
564 dbg("%s - stop bits = 2", __func__);
565 cflag |= CSTOPB;
566 break;
567 default:
568 dbg("%s - Unknown number of stop bits, using 1 stop bit",
569 __func__);
570 bits &= ~BITS_STOP_MASK;
571 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
572 break;
573 }
574
575 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
576 if (modem_ctl[0] & 0x0008) {
577 dbg("%s - flow control = CRTSCTS", __func__);
578 cflag |= CRTSCTS;
579 } else {
580 dbg("%s - flow control = NONE", __func__);
581 cflag &= ~CRTSCTS;
582 }
583
584 *cflagp = cflag;
585 }
586
587 /*
588 * CP2101 supports the following baud rates:
589 *
590 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
591 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
592 *
593 * CP2102 and CP2103 support the following additional rates:
594 *
595 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
596 * 576000
597 *
598 * The device will map a requested rate to a supported one, but the result
599 * of requests for rates greater than 1053257 is undefined (see AN205).
600 *
601 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
602 * respectively, with an error less than 1%. The actual rates are determined
603 * by
604 *
605 * div = round(freq / (2 x prescale x request))
606 * actual = freq / (2 x prescale x div)
607 *
608 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
609 * or 1 otherwise.
610 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
611 * otherwise.
612 */
cp210x_change_speed(struct tty_struct * tty,struct usb_serial_port * port,struct ktermios * old_termios)613 static void cp210x_change_speed(struct tty_struct *tty,
614 struct usb_serial_port *port, struct ktermios *old_termios)
615 {
616 u32 baud;
617
618 baud = tty->termios->c_ospeed;
619
620 /* This maps the requested rate to a rate valid on cp2102 or cp2103,
621 * or to an arbitrary rate in [1M,2M].
622 *
623 * NOTE: B0 is not implemented.
624 */
625 baud = cp210x_quantise_baudrate(baud);
626
627 dbg("%s - setting baud rate to %u", __func__, baud);
628 if (cp210x_set_config(port, CP210X_SET_BAUDRATE, &baud,
629 sizeof(baud))) {
630 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
631 if (old_termios)
632 baud = old_termios->c_ospeed;
633 else
634 baud = 9600;
635 }
636
637 tty_encode_baud_rate(tty, baud, baud);
638 }
639
cp210x_set_termios(struct tty_struct * tty,struct usb_serial_port * port,struct ktermios * old_termios)640 static void cp210x_set_termios(struct tty_struct *tty,
641 struct usb_serial_port *port, struct ktermios *old_termios)
642 {
643 unsigned int cflag, old_cflag;
644 unsigned int bits;
645 unsigned int modem_ctl[4];
646
647 dbg("%s - port %d", __func__, port->number);
648
649 if (!tty)
650 return;
651
652 cflag = tty->termios->c_cflag;
653 old_cflag = old_termios->c_cflag;
654
655 if (tty->termios->c_ospeed != old_termios->c_ospeed)
656 cp210x_change_speed(tty, port, old_termios);
657
658 /* If the number of data bits is to be updated */
659 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
660 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
661 bits &= ~BITS_DATA_MASK;
662 switch (cflag & CSIZE) {
663 case CS5:
664 bits |= BITS_DATA_5;
665 dbg("%s - data bits = 5", __func__);
666 break;
667 case CS6:
668 bits |= BITS_DATA_6;
669 dbg("%s - data bits = 6", __func__);
670 break;
671 case CS7:
672 bits |= BITS_DATA_7;
673 dbg("%s - data bits = 7", __func__);
674 break;
675 case CS8:
676 bits |= BITS_DATA_8;
677 dbg("%s - data bits = 8", __func__);
678 break;
679 /*case CS9:
680 bits |= BITS_DATA_9;
681 dbg("%s - data bits = 9", __func__);
682 break;*/
683 default:
684 dbg("cp210x driver does not "
685 "support the number of bits requested,"
686 " using 8 bit mode\n");
687 bits |= BITS_DATA_8;
688 break;
689 }
690 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
691 dbg("Number of data bits requested "
692 "not supported by device\n");
693 }
694
695 if ((cflag & (PARENB|PARODD|CMSPAR)) !=
696 (old_cflag & (PARENB|PARODD|CMSPAR))) {
697 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
698 bits &= ~BITS_PARITY_MASK;
699 if (cflag & PARENB) {
700 if (cflag & CMSPAR) {
701 if (cflag & PARODD) {
702 bits |= BITS_PARITY_MARK;
703 dbg("%s - parity = MARK", __func__);
704 } else {
705 bits |= BITS_PARITY_SPACE;
706 dbg("%s - parity = SPACE", __func__);
707 }
708 } else {
709 if (cflag & PARODD) {
710 bits |= BITS_PARITY_ODD;
711 dbg("%s - parity = ODD", __func__);
712 } else {
713 bits |= BITS_PARITY_EVEN;
714 dbg("%s - parity = EVEN", __func__);
715 }
716 }
717 }
718 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
719 dbg("Parity mode not supported "
720 "by device\n");
721 }
722
723 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
724 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
725 bits &= ~BITS_STOP_MASK;
726 if (cflag & CSTOPB) {
727 bits |= BITS_STOP_2;
728 dbg("%s - stop bits = 2", __func__);
729 } else {
730 bits |= BITS_STOP_1;
731 dbg("%s - stop bits = 1", __func__);
732 }
733 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
734 dbg("Number of stop bits requested "
735 "not supported by device\n");
736 }
737
738 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
739 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
740 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
741 __func__, modem_ctl[0], modem_ctl[1],
742 modem_ctl[2], modem_ctl[3]);
743
744 if (cflag & CRTSCTS) {
745 modem_ctl[0] &= ~0x7B;
746 modem_ctl[0] |= 0x09;
747 modem_ctl[1] = 0x80;
748 dbg("%s - flow control = CRTSCTS", __func__);
749 } else {
750 modem_ctl[0] &= ~0x7B;
751 modem_ctl[0] |= 0x01;
752 modem_ctl[1] |= 0x40;
753 dbg("%s - flow control = NONE", __func__);
754 }
755
756 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
757 __func__, modem_ctl[0], modem_ctl[1],
758 modem_ctl[2], modem_ctl[3]);
759 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16);
760 }
761
762 }
763
cp210x_tiocmset(struct tty_struct * tty,unsigned int set,unsigned int clear)764 static int cp210x_tiocmset (struct tty_struct *tty,
765 unsigned int set, unsigned int clear)
766 {
767 struct usb_serial_port *port = tty->driver_data;
768 return cp210x_tiocmset_port(port, set, clear);
769 }
770
cp210x_tiocmset_port(struct usb_serial_port * port,unsigned int set,unsigned int clear)771 static int cp210x_tiocmset_port(struct usb_serial_port *port,
772 unsigned int set, unsigned int clear)
773 {
774 unsigned int control = 0;
775
776 dbg("%s - port %d", __func__, port->number);
777
778 if (set & TIOCM_RTS) {
779 control |= CONTROL_RTS;
780 control |= CONTROL_WRITE_RTS;
781 }
782 if (set & TIOCM_DTR) {
783 control |= CONTROL_DTR;
784 control |= CONTROL_WRITE_DTR;
785 }
786 if (clear & TIOCM_RTS) {
787 control &= ~CONTROL_RTS;
788 control |= CONTROL_WRITE_RTS;
789 }
790 if (clear & TIOCM_DTR) {
791 control &= ~CONTROL_DTR;
792 control |= CONTROL_WRITE_DTR;
793 }
794
795 dbg("%s - control = 0x%.4x", __func__, control);
796
797 return cp210x_set_config(port, CP210X_SET_MHS, &control, 2);
798 }
799
cp210x_dtr_rts(struct usb_serial_port * p,int on)800 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
801 {
802 if (on)
803 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
804 else
805 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
806 }
807
cp210x_tiocmget(struct tty_struct * tty)808 static int cp210x_tiocmget (struct tty_struct *tty)
809 {
810 struct usb_serial_port *port = tty->driver_data;
811 unsigned int control;
812 int result;
813
814 dbg("%s - port %d", __func__, port->number);
815
816 cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1);
817
818 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
819 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
820 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
821 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
822 |((control & CONTROL_RING)? TIOCM_RI : 0)
823 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
824
825 dbg("%s - control = 0x%.2x", __func__, control);
826
827 return result;
828 }
829
cp210x_break_ctl(struct tty_struct * tty,int break_state)830 static void cp210x_break_ctl (struct tty_struct *tty, int break_state)
831 {
832 struct usb_serial_port *port = tty->driver_data;
833 unsigned int state;
834
835 dbg("%s - port %d", __func__, port->number);
836 if (break_state == 0)
837 state = BREAK_OFF;
838 else
839 state = BREAK_ON;
840 dbg("%s - turning break %s", __func__,
841 state == BREAK_OFF ? "off" : "on");
842 cp210x_set_config(port, CP210X_SET_BREAK, &state, 2);
843 }
844
cp210x_startup(struct usb_serial * serial)845 static int cp210x_startup(struct usb_serial *serial)
846 {
847 /* cp210x buffers behave strangely unless device is reset */
848 usb_reset_device(serial->dev);
849 return 0;
850 }
851
cp210x_init(void)852 static int __init cp210x_init(void)
853 {
854 int retval;
855
856 retval = usb_serial_register(&cp210x_device);
857 if (retval)
858 return retval; /* Failed to register */
859
860 retval = usb_register(&cp210x_driver);
861 if (retval) {
862 /* Failed to register */
863 usb_serial_deregister(&cp210x_device);
864 return retval;
865 }
866
867 /* Success */
868 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
869 DRIVER_DESC "\n");
870 return 0;
871 }
872
cp210x_exit(void)873 static void __exit cp210x_exit(void)
874 {
875 usb_deregister(&cp210x_driver);
876 usb_serial_deregister(&cp210x_device);
877 }
878
879 module_init(cp210x_init);
880 module_exit(cp210x_exit);
881
882 MODULE_DESCRIPTION(DRIVER_DESC);
883 MODULE_VERSION(DRIVER_VERSION);
884 MODULE_LICENSE("GPL");
885
886 module_param(debug, bool, S_IRUGO | S_IWUSR);
887 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");
888