2 * Silicon Laboratories CP210x USB to RS232 serial adaptor driver
4 * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
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.
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
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>
30 #define DRIVER_VERSION "v0.09"
31 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
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 *,
44 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
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);
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(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
140 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
141 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
142 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
143 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
144 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
145 { } /* Terminating Entry */
148 MODULE_DEVICE_TABLE(usb, id_table);
150 static struct usb_driver cp210x_driver = {
152 .probe = usb_serial_probe,
153 .disconnect = usb_serial_disconnect,
154 .id_table = id_table,
158 static struct usb_serial_driver cp210x_device = {
160 .owner = THIS_MODULE,
163 .usb_driver = &cp210x_driver,
164 .id_table = id_table,
167 .bulk_out_size = 256,
169 .close = cp210x_close,
170 .break_ctl = cp210x_break_ctl,
171 .set_termios = cp210x_set_termios,
172 .tiocmget = cp210x_tiocmget,
173 .tiocmset = cp210x_tiocmset,
174 .attach = cp210x_startup,
175 .dtr_rts = cp210x_dtr_rts
178 /* Config request types */
179 #define REQTYPE_HOST_TO_DEVICE 0x41
180 #define REQTYPE_DEVICE_TO_HOST 0xc1
182 /* Config request codes */
183 #define CP210X_IFC_ENABLE 0x00
184 #define CP210X_SET_BAUDDIV 0x01
185 #define CP210X_GET_BAUDDIV 0x02
186 #define CP210X_SET_LINE_CTL 0x03
187 #define CP210X_GET_LINE_CTL 0x04
188 #define CP210X_SET_BREAK 0x05
189 #define CP210X_IMM_CHAR 0x06
190 #define CP210X_SET_MHS 0x07
191 #define CP210X_GET_MDMSTS 0x08
192 #define CP210X_SET_XON 0x09
193 #define CP210X_SET_XOFF 0x0A
194 #define CP210X_SET_EVENTMASK 0x0B
195 #define CP210X_GET_EVENTMASK 0x0C
196 #define CP210X_SET_CHAR 0x0D
197 #define CP210X_GET_CHARS 0x0E
198 #define CP210X_GET_PROPS 0x0F
199 #define CP210X_GET_COMM_STATUS 0x10
200 #define CP210X_RESET 0x11
201 #define CP210X_PURGE 0x12
202 #define CP210X_SET_FLOW 0x13
203 #define CP210X_GET_FLOW 0x14
204 #define CP210X_EMBED_EVENTS 0x15
205 #define CP210X_GET_EVENTSTATE 0x16
206 #define CP210X_SET_CHARS 0x19
207 #define CP210X_GET_BAUDRATE 0x1D
208 #define CP210X_SET_BAUDRATE 0x1E
210 /* CP210X_IFC_ENABLE */
211 #define UART_ENABLE 0x0001
212 #define UART_DISABLE 0x0000
214 /* CP210X_(SET|GET)_BAUDDIV */
215 #define BAUD_RATE_GEN_FREQ 0x384000
217 /* CP210X_(SET|GET)_LINE_CTL */
218 #define BITS_DATA_MASK 0X0f00
219 #define BITS_DATA_5 0X0500
220 #define BITS_DATA_6 0X0600
221 #define BITS_DATA_7 0X0700
222 #define BITS_DATA_8 0X0800
223 #define BITS_DATA_9 0X0900
225 #define BITS_PARITY_MASK 0x00f0
226 #define BITS_PARITY_NONE 0x0000
227 #define BITS_PARITY_ODD 0x0010
228 #define BITS_PARITY_EVEN 0x0020
229 #define BITS_PARITY_MARK 0x0030
230 #define BITS_PARITY_SPACE 0x0040
232 #define BITS_STOP_MASK 0x000f
233 #define BITS_STOP_1 0x0000
234 #define BITS_STOP_1_5 0x0001
235 #define BITS_STOP_2 0x0002
237 /* CP210X_SET_BREAK */
238 #define BREAK_ON 0x0001
239 #define BREAK_OFF 0x0000
241 /* CP210X_(SET_MHS|GET_MDMSTS) */
242 #define CONTROL_DTR 0x0001
243 #define CONTROL_RTS 0x0002
244 #define CONTROL_CTS 0x0010
245 #define CONTROL_DSR 0x0020
246 #define CONTROL_RING 0x0040
247 #define CONTROL_DCD 0x0080
248 #define CONTROL_WRITE_DTR 0x0100
249 #define CONTROL_WRITE_RTS 0x0200
253 * Reads from the CP210x configuration registers
254 * 'size' is specified in bytes.
255 * 'data' is a pointer to a pre-allocated array of integers large
256 * enough to hold 'size' bytes (with 4 bytes to each integer)
258 static int cp210x_get_config(struct usb_serial_port *port, u8 request,
259 unsigned int *data, int size)
261 struct usb_serial *serial = port->serial;
263 int result, i, length;
265 /* Number of integers required to contain the array */
266 length = (((size - 1) | 3) + 1)/4;
268 buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
270 dev_err(&port->dev, "%s - out of memory.\n", __func__);
274 /* Issue the request, attempting to read 'size' bytes */
275 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
276 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
279 /* Convert data into an array of integers */
280 for (i = 0; i < length; i++)
281 data[i] = le32_to_cpu(buf[i]);
285 if (result != size) {
286 dbg("%s - Unable to send config request, "
287 "request=0x%x size=%d result=%d\n",
288 __func__, request, size, result);
297 * Writes to the CP210x configuration registers
298 * Values less than 16 bits wide are sent directly
299 * 'size' is specified in bytes.
301 static int cp210x_set_config(struct usb_serial_port *port, u8 request,
302 unsigned int *data, int size)
304 struct usb_serial *serial = port->serial;
306 int result, i, length;
308 /* Number of integers required to contain the array */
309 length = (((size - 1) | 3) + 1)/4;
311 buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
313 dev_err(&port->dev, "%s - out of memory.\n",
318 /* Array of integers into bytes */
319 for (i = 0; i < length; i++)
320 buf[i] = cpu_to_le32(data[i]);
323 result = usb_control_msg(serial->dev,
324 usb_sndctrlpipe(serial->dev, 0),
325 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
328 result = usb_control_msg(serial->dev,
329 usb_sndctrlpipe(serial->dev, 0),
330 request, REQTYPE_HOST_TO_DEVICE, data[0],
336 if ((size > 2 && result != size) || result < 0) {
337 dbg("%s - Unable to send request, "
338 "request=0x%x size=%d result=%d\n",
339 __func__, request, size, result);
347 * cp210x_set_config_single
348 * Convenience function for calling cp210x_set_config on single data values
349 * without requiring an integer pointer
351 static inline int cp210x_set_config_single(struct usb_serial_port *port,
352 u8 request, unsigned int data)
354 return cp210x_set_config(port, request, &data, 2);
358 * cp210x_quantise_baudrate
359 * Quantises the baud rate as per AN205 Table 1
361 static unsigned int cp210x_quantise_baudrate(unsigned int baud) {
364 else if (baud <= 600) baud = 600;
365 else if (baud <= 1200) baud = 1200;
366 else if (baud <= 1800) baud = 1800;
367 else if (baud <= 2400) baud = 2400;
368 else if (baud <= 4000) baud = 4000;
369 else if (baud <= 4803) baud = 4800;
370 else if (baud <= 7207) baud = 7200;
371 else if (baud <= 9612) baud = 9600;
372 else if (baud <= 14428) baud = 14400;
373 else if (baud <= 16062) baud = 16000;
374 else if (baud <= 19250) baud = 19200;
375 else if (baud <= 28912) baud = 28800;
376 else if (baud <= 38601) baud = 38400;
377 else if (baud <= 51558) baud = 51200;
378 else if (baud <= 56280) baud = 56000;
379 else if (baud <= 58053) baud = 57600;
380 else if (baud <= 64111) baud = 64000;
381 else if (baud <= 77608) baud = 76800;
382 else if (baud <= 117028) baud = 115200;
383 else if (baud <= 129347) baud = 128000;
384 else if (baud <= 156868) baud = 153600;
385 else if (baud <= 237832) baud = 230400;
386 else if (baud <= 254234) baud = 250000;
387 else if (baud <= 273066) baud = 256000;
388 else if (baud <= 491520) baud = 460800;
389 else if (baud <= 567138) baud = 500000;
390 else if (baud <= 670254) baud = 576000;
391 else if (baud <= 1053257) baud = 921600;
392 else if (baud <= 1474560) baud = 1228800;
393 else if (baud <= 2457600) baud = 1843200;
398 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
400 dbg("%s - port %d", __func__, port->number);
402 if (cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_ENABLE)) {
403 dev_err(&port->dev, "%s - Unable to enable UART\n",
408 /* Configure the termios structure */
409 cp210x_get_termios(tty, port);
411 return usb_serial_generic_open(tty, port);
414 static void cp210x_close(struct usb_serial_port *port)
416 dbg("%s - port %d", __func__, port->number);
418 usb_serial_generic_close(port);
420 mutex_lock(&port->serial->disc_mutex);
421 if (!port->serial->disconnected)
422 cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE);
423 mutex_unlock(&port->serial->disc_mutex);
428 * Reads the baud rate, data bits, parity, stop bits and flow control mode
429 * from the device, corrects any unsupported values, and configures the
430 * termios structure to reflect the state of the device
432 static void cp210x_get_termios(struct tty_struct *tty,
433 struct usb_serial_port *port)
438 cp210x_get_termios_port(tty->driver_data,
439 &tty->termios->c_cflag, &baud);
440 tty_encode_baud_rate(tty, baud, baud);
446 cp210x_get_termios_port(port, &cflag, &baud);
451 * cp210x_get_termios_port
452 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
454 static void cp210x_get_termios_port(struct usb_serial_port *port,
455 unsigned int *cflagp, unsigned int *baudp)
457 unsigned int cflag, modem_ctl[4];
461 dbg("%s - port %d", __func__, port->number);
463 cp210x_get_config(port, CP210X_GET_BAUDRATE, &baud, 4);
465 dbg("%s - baud rate = %d", __func__, baud);
470 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
472 switch (bits & BITS_DATA_MASK) {
474 dbg("%s - data bits = 5", __func__);
478 dbg("%s - data bits = 6", __func__);
482 dbg("%s - data bits = 7", __func__);
486 dbg("%s - data bits = 8", __func__);
490 dbg("%s - data bits = 9 (not supported, using 8 data bits)",
493 bits &= ~BITS_DATA_MASK;
495 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
498 dbg("%s - Unknown number of data bits, using 8", __func__);
500 bits &= ~BITS_DATA_MASK;
502 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
506 switch (bits & BITS_PARITY_MASK) {
507 case BITS_PARITY_NONE:
508 dbg("%s - parity = NONE", __func__);
511 case BITS_PARITY_ODD:
512 dbg("%s - parity = ODD", __func__);
513 cflag |= (PARENB|PARODD);
515 case BITS_PARITY_EVEN:
516 dbg("%s - parity = EVEN", __func__);
520 case BITS_PARITY_MARK:
521 dbg("%s - parity = MARK (not supported, disabling parity)",
524 bits &= ~BITS_PARITY_MASK;
525 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
527 case BITS_PARITY_SPACE:
528 dbg("%s - parity = SPACE (not supported, disabling parity)",
531 bits &= ~BITS_PARITY_MASK;
532 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
535 dbg("%s - Unknown parity mode, disabling parity", __func__);
537 bits &= ~BITS_PARITY_MASK;
538 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
543 switch (bits & BITS_STOP_MASK) {
545 dbg("%s - stop bits = 1", __func__);
548 dbg("%s - stop bits = 1.5 (not supported, using 1 stop bit)",
550 bits &= ~BITS_STOP_MASK;
551 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
554 dbg("%s - stop bits = 2", __func__);
558 dbg("%s - Unknown number of stop bits, using 1 stop bit",
560 bits &= ~BITS_STOP_MASK;
561 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
565 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
566 if (modem_ctl[0] & 0x0008) {
567 dbg("%s - flow control = CRTSCTS", __func__);
570 dbg("%s - flow control = NONE", __func__);
578 * CP2101 supports the following baud rates:
580 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
581 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
583 * CP2102 and CP2103 support the following additional rates:
585 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
588 * The device will map a requested rate to a supported one, but the result
589 * of requests for rates greater than 1053257 is undefined (see AN205).
591 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
592 * respectively, with an error less than 1%. The actual rates are determined
595 * div = round(freq / (2 x prescale x request))
596 * actual = freq / (2 x prescale x div)
598 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
600 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
603 static void cp210x_change_speed(struct tty_struct *tty,
604 struct usb_serial_port *port, struct ktermios *old_termios)
608 baud = tty->termios->c_ospeed;
610 /* This maps the requested rate to a rate valid on cp2102 or cp2103.
612 * NOTE: B0 is not implemented.
614 baud = cp210x_quantise_baudrate(baud);
616 dbg("%s - setting baud rate to %u", __func__, baud);
617 if (cp210x_set_config(port, CP210X_SET_BAUDRATE, &baud,
619 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
621 baud = old_termios->c_ospeed;
626 tty_encode_baud_rate(tty, baud, baud);
629 static void cp210x_set_termios(struct tty_struct *tty,
630 struct usb_serial_port *port, struct ktermios *old_termios)
632 unsigned int cflag, old_cflag;
634 unsigned int modem_ctl[4];
636 dbg("%s - port %d", __func__, port->number);
641 tty->termios->c_cflag &= ~CMSPAR;
642 cflag = tty->termios->c_cflag;
643 old_cflag = old_termios->c_cflag;
645 if (tty->termios->c_ospeed != old_termios->c_ospeed)
646 cp210x_change_speed(tty, port, old_termios);
648 /* If the number of data bits is to be updated */
649 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
650 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
651 bits &= ~BITS_DATA_MASK;
652 switch (cflag & CSIZE) {
655 dbg("%s - data bits = 5", __func__);
659 dbg("%s - data bits = 6", __func__);
663 dbg("%s - data bits = 7", __func__);
667 dbg("%s - data bits = 8", __func__);
671 dbg("%s - data bits = 9", __func__);
674 dbg("cp210x driver does not "
675 "support the number of bits requested,"
676 " using 8 bit mode\n");
680 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
681 dbg("Number of data bits requested "
682 "not supported by device\n");
685 if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
686 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
687 bits &= ~BITS_PARITY_MASK;
688 if (cflag & PARENB) {
689 if (cflag & PARODD) {
690 bits |= BITS_PARITY_ODD;
691 dbg("%s - parity = ODD", __func__);
693 bits |= BITS_PARITY_EVEN;
694 dbg("%s - parity = EVEN", __func__);
697 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
698 dbg("Parity mode not supported "
702 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
703 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
704 bits &= ~BITS_STOP_MASK;
705 if (cflag & CSTOPB) {
707 dbg("%s - stop bits = 2", __func__);
710 dbg("%s - stop bits = 1", __func__);
712 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
713 dbg("Number of stop bits requested "
714 "not supported by device\n");
717 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
718 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
719 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
720 __func__, modem_ctl[0], modem_ctl[1],
721 modem_ctl[2], modem_ctl[3]);
723 if (cflag & CRTSCTS) {
724 modem_ctl[0] &= ~0x7B;
725 modem_ctl[0] |= 0x09;
727 dbg("%s - flow control = CRTSCTS", __func__);
729 modem_ctl[0] &= ~0x7B;
730 modem_ctl[0] |= 0x01;
731 modem_ctl[1] |= 0x40;
732 dbg("%s - flow control = NONE", __func__);
735 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
736 __func__, modem_ctl[0], modem_ctl[1],
737 modem_ctl[2], modem_ctl[3]);
738 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16);
743 static int cp210x_tiocmset (struct tty_struct *tty,
744 unsigned int set, unsigned int clear)
746 struct usb_serial_port *port = tty->driver_data;
747 return cp210x_tiocmset_port(port, set, clear);
750 static int cp210x_tiocmset_port(struct usb_serial_port *port,
751 unsigned int set, unsigned int clear)
753 unsigned int control = 0;
755 dbg("%s - port %d", __func__, port->number);
757 if (set & TIOCM_RTS) {
758 control |= CONTROL_RTS;
759 control |= CONTROL_WRITE_RTS;
761 if (set & TIOCM_DTR) {
762 control |= CONTROL_DTR;
763 control |= CONTROL_WRITE_DTR;
765 if (clear & TIOCM_RTS) {
766 control &= ~CONTROL_RTS;
767 control |= CONTROL_WRITE_RTS;
769 if (clear & TIOCM_DTR) {
770 control &= ~CONTROL_DTR;
771 control |= CONTROL_WRITE_DTR;
774 dbg("%s - control = 0x%.4x", __func__, control);
776 return cp210x_set_config(port, CP210X_SET_MHS, &control, 2);
779 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
782 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
784 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
787 static int cp210x_tiocmget (struct tty_struct *tty)
789 struct usb_serial_port *port = tty->driver_data;
790 unsigned int control;
793 dbg("%s - port %d", __func__, port->number);
795 cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1);
797 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
798 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
799 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
800 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
801 |((control & CONTROL_RING)? TIOCM_RI : 0)
802 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
804 dbg("%s - control = 0x%.2x", __func__, control);
809 static void cp210x_break_ctl (struct tty_struct *tty, int break_state)
811 struct usb_serial_port *port = tty->driver_data;
814 dbg("%s - port %d", __func__, port->number);
815 if (break_state == 0)
819 dbg("%s - turning break %s", __func__,
820 state == BREAK_OFF ? "off" : "on");
821 cp210x_set_config(port, CP210X_SET_BREAK, &state, 2);
824 static int cp210x_startup(struct usb_serial *serial)
826 /* cp210x buffers behave strangely unless device is reset */
827 usb_reset_device(serial->dev);
831 static int __init cp210x_init(void)
835 retval = usb_serial_register(&cp210x_device);
837 return retval; /* Failed to register */
839 retval = usb_register(&cp210x_driver);
841 /* Failed to register */
842 usb_serial_deregister(&cp210x_device);
847 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
852 static void __exit cp210x_exit(void)
854 usb_deregister(&cp210x_driver);
855 usb_serial_deregister(&cp210x_device);
858 module_init(cp210x_init);
859 module_exit(cp210x_exit);
861 MODULE_DESCRIPTION(DRIVER_DESC);
862 MODULE_VERSION(DRIVER_VERSION);
863 MODULE_LICENSE("GPL");
865 module_param(debug, bool, S_IRUGO | S_IWUSR);
866 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");