MIPS: ralink: adds support for RT2880 SoC family
[linux-2.6/btrfs-unstable.git] / drivers / usb / serial / cp210x.c
blob4747d1c328ffbdc13e1ca4337dc11a6c557711f5
1 /*
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>
27 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
30 * Function Prototypes
32 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
33 static void cp210x_close(struct usb_serial_port *);
34 static void cp210x_get_termios(struct tty_struct *, struct usb_serial_port *);
35 static void cp210x_get_termios_port(struct usb_serial_port *port,
36 unsigned int *cflagp, unsigned int *baudp);
37 static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *,
38 struct ktermios *);
39 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
40 struct ktermios*);
41 static int cp210x_tiocmget(struct tty_struct *);
42 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
43 static int cp210x_tiocmset_port(struct usb_serial_port *port,
44 unsigned int, unsigned int);
45 static void cp210x_break_ctl(struct tty_struct *, int);
46 static int cp210x_startup(struct usb_serial *);
47 static void cp210x_release(struct usb_serial *);
48 static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
50 static const struct usb_device_id id_table[] = {
51 { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */
52 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
53 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
54 { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
55 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
56 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
57 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
58 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
59 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
60 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
61 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
62 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
63 { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */
64 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
65 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
66 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
67 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
68 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
69 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
70 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
71 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
72 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
73 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
74 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
75 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
76 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
77 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
78 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
79 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
80 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
81 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
82 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
83 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
84 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
85 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
86 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
87 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
88 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
89 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
90 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
91 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
92 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
93 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
94 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
95 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
96 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
97 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
98 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
99 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
100 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
101 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
102 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
103 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
104 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
105 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
106 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
107 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
108 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
109 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
110 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
111 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
112 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
113 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
114 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
115 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
116 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
117 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
118 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
119 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
120 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
121 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
122 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
123 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
124 { USB_DEVICE(0x10C4, 0xEA80) }, /* Silicon Labs factory default */
125 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
126 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
127 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
128 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
129 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
130 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
131 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
132 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
133 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
134 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
135 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
136 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
137 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
138 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
139 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
140 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
141 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
142 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
143 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
144 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
145 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
146 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
147 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
148 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
149 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
150 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
151 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
152 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
153 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
154 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
155 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
156 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
157 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
158 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
159 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
160 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
161 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
162 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
163 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
164 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
165 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
166 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
167 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
168 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
169 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
170 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
171 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
172 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
173 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
174 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
175 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
176 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
177 { } /* Terminating Entry */
180 MODULE_DEVICE_TABLE(usb, id_table);
182 struct cp210x_serial_private {
183 __u8 bInterfaceNumber;
186 static struct usb_serial_driver cp210x_device = {
187 .driver = {
188 .owner = THIS_MODULE,
189 .name = "cp210x",
191 .id_table = id_table,
192 .num_ports = 1,
193 .bulk_in_size = 256,
194 .bulk_out_size = 256,
195 .open = cp210x_open,
196 .close = cp210x_close,
197 .break_ctl = cp210x_break_ctl,
198 .set_termios = cp210x_set_termios,
199 .tiocmget = cp210x_tiocmget,
200 .tiocmset = cp210x_tiocmset,
201 .attach = cp210x_startup,
202 .release = cp210x_release,
203 .dtr_rts = cp210x_dtr_rts
206 static struct usb_serial_driver * const serial_drivers[] = {
207 &cp210x_device, NULL
210 /* Config request types */
211 #define REQTYPE_HOST_TO_INTERFACE 0x41
212 #define REQTYPE_INTERFACE_TO_HOST 0xc1
213 #define REQTYPE_HOST_TO_DEVICE 0x40
214 #define REQTYPE_DEVICE_TO_HOST 0xc0
216 /* Config request codes */
217 #define CP210X_IFC_ENABLE 0x00
218 #define CP210X_SET_BAUDDIV 0x01
219 #define CP210X_GET_BAUDDIV 0x02
220 #define CP210X_SET_LINE_CTL 0x03
221 #define CP210X_GET_LINE_CTL 0x04
222 #define CP210X_SET_BREAK 0x05
223 #define CP210X_IMM_CHAR 0x06
224 #define CP210X_SET_MHS 0x07
225 #define CP210X_GET_MDMSTS 0x08
226 #define CP210X_SET_XON 0x09
227 #define CP210X_SET_XOFF 0x0A
228 #define CP210X_SET_EVENTMASK 0x0B
229 #define CP210X_GET_EVENTMASK 0x0C
230 #define CP210X_SET_CHAR 0x0D
231 #define CP210X_GET_CHARS 0x0E
232 #define CP210X_GET_PROPS 0x0F
233 #define CP210X_GET_COMM_STATUS 0x10
234 #define CP210X_RESET 0x11
235 #define CP210X_PURGE 0x12
236 #define CP210X_SET_FLOW 0x13
237 #define CP210X_GET_FLOW 0x14
238 #define CP210X_EMBED_EVENTS 0x15
239 #define CP210X_GET_EVENTSTATE 0x16
240 #define CP210X_SET_CHARS 0x19
241 #define CP210X_GET_BAUDRATE 0x1D
242 #define CP210X_SET_BAUDRATE 0x1E
244 /* CP210X_IFC_ENABLE */
245 #define UART_ENABLE 0x0001
246 #define UART_DISABLE 0x0000
248 /* CP210X_(SET|GET)_BAUDDIV */
249 #define BAUD_RATE_GEN_FREQ 0x384000
251 /* CP210X_(SET|GET)_LINE_CTL */
252 #define BITS_DATA_MASK 0X0f00
253 #define BITS_DATA_5 0X0500
254 #define BITS_DATA_6 0X0600
255 #define BITS_DATA_7 0X0700
256 #define BITS_DATA_8 0X0800
257 #define BITS_DATA_9 0X0900
259 #define BITS_PARITY_MASK 0x00f0
260 #define BITS_PARITY_NONE 0x0000
261 #define BITS_PARITY_ODD 0x0010
262 #define BITS_PARITY_EVEN 0x0020
263 #define BITS_PARITY_MARK 0x0030
264 #define BITS_PARITY_SPACE 0x0040
266 #define BITS_STOP_MASK 0x000f
267 #define BITS_STOP_1 0x0000
268 #define BITS_STOP_1_5 0x0001
269 #define BITS_STOP_2 0x0002
271 /* CP210X_SET_BREAK */
272 #define BREAK_ON 0x0001
273 #define BREAK_OFF 0x0000
275 /* CP210X_(SET_MHS|GET_MDMSTS) */
276 #define CONTROL_DTR 0x0001
277 #define CONTROL_RTS 0x0002
278 #define CONTROL_CTS 0x0010
279 #define CONTROL_DSR 0x0020
280 #define CONTROL_RING 0x0040
281 #define CONTROL_DCD 0x0080
282 #define CONTROL_WRITE_DTR 0x0100
283 #define CONTROL_WRITE_RTS 0x0200
286 * cp210x_get_config
287 * Reads from the CP210x configuration registers
288 * 'size' is specified in bytes.
289 * 'data' is a pointer to a pre-allocated array of integers large
290 * enough to hold 'size' bytes (with 4 bytes to each integer)
292 static int cp210x_get_config(struct usb_serial_port *port, u8 request,
293 unsigned int *data, int size)
295 struct usb_serial *serial = port->serial;
296 struct cp210x_serial_private *spriv = usb_get_serial_data(serial);
297 __le32 *buf;
298 int result, i, length;
300 /* Number of integers required to contain the array */
301 length = (((size - 1) | 3) + 1) / 4;
303 buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
304 if (!buf) {
305 dev_err(&port->dev, "%s - out of memory.\n", __func__);
306 return -ENOMEM;
309 /* Issue the request, attempting to read 'size' bytes */
310 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
311 request, REQTYPE_INTERFACE_TO_HOST, 0x0000,
312 spriv->bInterfaceNumber, buf, size,
313 USB_CTRL_GET_TIMEOUT);
315 /* Convert data into an array of integers */
316 for (i = 0; i < length; i++)
317 data[i] = le32_to_cpu(buf[i]);
319 kfree(buf);
321 if (result != size) {
322 dev_dbg(&port->dev, "%s - Unable to send config request, request=0x%x size=%d result=%d\n",
323 __func__, request, size, result);
324 if (result > 0)
325 result = -EPROTO;
327 return result;
330 return 0;
334 * cp210x_set_config
335 * Writes to the CP210x configuration registers
336 * Values less than 16 bits wide are sent directly
337 * 'size' is specified in bytes.
339 static int cp210x_set_config(struct usb_serial_port *port, u8 request,
340 unsigned int *data, int size)
342 struct usb_serial *serial = port->serial;
343 struct cp210x_serial_private *spriv = usb_get_serial_data(serial);
344 __le32 *buf;
345 int result, i, length;
347 /* Number of integers required to contain the array */
348 length = (((size - 1) | 3) + 1) / 4;
350 buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
351 if (!buf) {
352 dev_err(&port->dev, "%s - out of memory.\n", __func__);
353 return -ENOMEM;
356 /* Array of integers into bytes */
357 for (i = 0; i < length; i++)
358 buf[i] = cpu_to_le32(data[i]);
360 if (size > 2) {
361 result = usb_control_msg(serial->dev,
362 usb_sndctrlpipe(serial->dev, 0),
363 request, REQTYPE_HOST_TO_INTERFACE, 0x0000,
364 spriv->bInterfaceNumber, buf, size,
365 USB_CTRL_SET_TIMEOUT);
366 } else {
367 result = usb_control_msg(serial->dev,
368 usb_sndctrlpipe(serial->dev, 0),
369 request, REQTYPE_HOST_TO_INTERFACE, data[0],
370 spriv->bInterfaceNumber, NULL, 0,
371 USB_CTRL_SET_TIMEOUT);
374 kfree(buf);
376 if ((size > 2 && result != size) || result < 0) {
377 dev_dbg(&port->dev, "%s - Unable to send request, request=0x%x size=%d result=%d\n",
378 __func__, request, size, result);
379 if (result > 0)
380 result = -EPROTO;
382 return result;
385 return 0;
389 * cp210x_set_config_single
390 * Convenience function for calling cp210x_set_config on single data values
391 * without requiring an integer pointer
393 static inline int cp210x_set_config_single(struct usb_serial_port *port,
394 u8 request, unsigned int data)
396 return cp210x_set_config(port, request, &data, 2);
400 * cp210x_quantise_baudrate
401 * Quantises the baud rate as per AN205 Table 1
403 static unsigned int cp210x_quantise_baudrate(unsigned int baud)
405 if (baud <= 300)
406 baud = 300;
407 else if (baud <= 600) baud = 600;
408 else if (baud <= 1200) baud = 1200;
409 else if (baud <= 1800) baud = 1800;
410 else if (baud <= 2400) baud = 2400;
411 else if (baud <= 4000) baud = 4000;
412 else if (baud <= 4803) baud = 4800;
413 else if (baud <= 7207) baud = 7200;
414 else if (baud <= 9612) baud = 9600;
415 else if (baud <= 14428) baud = 14400;
416 else if (baud <= 16062) baud = 16000;
417 else if (baud <= 19250) baud = 19200;
418 else if (baud <= 28912) baud = 28800;
419 else if (baud <= 38601) baud = 38400;
420 else if (baud <= 51558) baud = 51200;
421 else if (baud <= 56280) baud = 56000;
422 else if (baud <= 58053) baud = 57600;
423 else if (baud <= 64111) baud = 64000;
424 else if (baud <= 77608) baud = 76800;
425 else if (baud <= 117028) baud = 115200;
426 else if (baud <= 129347) baud = 128000;
427 else if (baud <= 156868) baud = 153600;
428 else if (baud <= 237832) baud = 230400;
429 else if (baud <= 254234) baud = 250000;
430 else if (baud <= 273066) baud = 256000;
431 else if (baud <= 491520) baud = 460800;
432 else if (baud <= 567138) baud = 500000;
433 else if (baud <= 670254) baud = 576000;
434 else if (baud < 1000000)
435 baud = 921600;
436 else if (baud > 2000000)
437 baud = 2000000;
438 return baud;
441 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
443 int result;
445 result = cp210x_set_config_single(port, CP210X_IFC_ENABLE,
446 UART_ENABLE);
447 if (result) {
448 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
449 return result;
452 /* Configure the termios structure */
453 cp210x_get_termios(tty, port);
455 /* The baud rate must be initialised on cp2104 */
456 if (tty)
457 cp210x_change_speed(tty, port, NULL);
459 return usb_serial_generic_open(tty, port);
462 static void cp210x_close(struct usb_serial_port *port)
464 usb_serial_generic_close(port);
466 mutex_lock(&port->serial->disc_mutex);
467 if (!port->serial->disconnected)
468 cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE);
469 mutex_unlock(&port->serial->disc_mutex);
473 * cp210x_get_termios
474 * Reads the baud rate, data bits, parity, stop bits and flow control mode
475 * from the device, corrects any unsupported values, and configures the
476 * termios structure to reflect the state of the device
478 static void cp210x_get_termios(struct tty_struct *tty,
479 struct usb_serial_port *port)
481 unsigned int baud;
483 if (tty) {
484 cp210x_get_termios_port(tty->driver_data,
485 &tty->termios.c_cflag, &baud);
486 tty_encode_baud_rate(tty, baud, baud);
487 } else {
488 unsigned int cflag;
489 cflag = 0;
490 cp210x_get_termios_port(port, &cflag, &baud);
495 * cp210x_get_termios_port
496 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
498 static void cp210x_get_termios_port(struct usb_serial_port *port,
499 unsigned int *cflagp, unsigned int *baudp)
501 struct device *dev = &port->dev;
502 unsigned int cflag, modem_ctl[4];
503 unsigned int baud;
504 unsigned int bits;
506 cp210x_get_config(port, CP210X_GET_BAUDRATE, &baud, 4);
508 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
509 *baudp = baud;
511 cflag = *cflagp;
513 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
514 cflag &= ~CSIZE;
515 switch (bits & BITS_DATA_MASK) {
516 case BITS_DATA_5:
517 dev_dbg(dev, "%s - data bits = 5\n", __func__);
518 cflag |= CS5;
519 break;
520 case BITS_DATA_6:
521 dev_dbg(dev, "%s - data bits = 6\n", __func__);
522 cflag |= CS6;
523 break;
524 case BITS_DATA_7:
525 dev_dbg(dev, "%s - data bits = 7\n", __func__);
526 cflag |= CS7;
527 break;
528 case BITS_DATA_8:
529 dev_dbg(dev, "%s - data bits = 8\n", __func__);
530 cflag |= CS8;
531 break;
532 case BITS_DATA_9:
533 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
534 cflag |= CS8;
535 bits &= ~BITS_DATA_MASK;
536 bits |= BITS_DATA_8;
537 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
538 break;
539 default:
540 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
541 cflag |= CS8;
542 bits &= ~BITS_DATA_MASK;
543 bits |= BITS_DATA_8;
544 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
545 break;
548 switch (bits & BITS_PARITY_MASK) {
549 case BITS_PARITY_NONE:
550 dev_dbg(dev, "%s - parity = NONE\n", __func__);
551 cflag &= ~PARENB;
552 break;
553 case BITS_PARITY_ODD:
554 dev_dbg(dev, "%s - parity = ODD\n", __func__);
555 cflag |= (PARENB|PARODD);
556 break;
557 case BITS_PARITY_EVEN:
558 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
559 cflag &= ~PARODD;
560 cflag |= PARENB;
561 break;
562 case BITS_PARITY_MARK:
563 dev_dbg(dev, "%s - parity = MARK\n", __func__);
564 cflag |= (PARENB|PARODD|CMSPAR);
565 break;
566 case BITS_PARITY_SPACE:
567 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
568 cflag &= ~PARODD;
569 cflag |= (PARENB|CMSPAR);
570 break;
571 default:
572 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
573 cflag &= ~PARENB;
574 bits &= ~BITS_PARITY_MASK;
575 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
576 break;
579 cflag &= ~CSTOPB;
580 switch (bits & BITS_STOP_MASK) {
581 case BITS_STOP_1:
582 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
583 break;
584 case BITS_STOP_1_5:
585 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
586 bits &= ~BITS_STOP_MASK;
587 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
588 break;
589 case BITS_STOP_2:
590 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
591 cflag |= CSTOPB;
592 break;
593 default:
594 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
595 bits &= ~BITS_STOP_MASK;
596 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
597 break;
600 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
601 if (modem_ctl[0] & 0x0008) {
602 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
603 cflag |= CRTSCTS;
604 } else {
605 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
606 cflag &= ~CRTSCTS;
609 *cflagp = cflag;
613 * CP2101 supports the following baud rates:
615 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
616 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
618 * CP2102 and CP2103 support the following additional rates:
620 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
621 * 576000
623 * The device will map a requested rate to a supported one, but the result
624 * of requests for rates greater than 1053257 is undefined (see AN205).
626 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
627 * respectively, with an error less than 1%. The actual rates are determined
628 * by
630 * div = round(freq / (2 x prescale x request))
631 * actual = freq / (2 x prescale x div)
633 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
634 * or 1 otherwise.
635 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
636 * otherwise.
638 static void cp210x_change_speed(struct tty_struct *tty,
639 struct usb_serial_port *port, struct ktermios *old_termios)
641 u32 baud;
643 baud = tty->termios.c_ospeed;
645 /* This maps the requested rate to a rate valid on cp2102 or cp2103,
646 * or to an arbitrary rate in [1M,2M].
648 * NOTE: B0 is not implemented.
650 baud = cp210x_quantise_baudrate(baud);
652 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
653 if (cp210x_set_config(port, CP210X_SET_BAUDRATE, &baud,
654 sizeof(baud))) {
655 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
656 if (old_termios)
657 baud = old_termios->c_ospeed;
658 else
659 baud = 9600;
662 tty_encode_baud_rate(tty, baud, baud);
665 static void cp210x_set_termios(struct tty_struct *tty,
666 struct usb_serial_port *port, struct ktermios *old_termios)
668 struct device *dev = &port->dev;
669 unsigned int cflag, old_cflag;
670 unsigned int bits;
671 unsigned int modem_ctl[4];
673 dev_dbg(dev, "%s - port %d\n", __func__, port->number);
675 if (!tty)
676 return;
678 cflag = tty->termios.c_cflag;
679 old_cflag = old_termios->c_cflag;
681 if (tty->termios.c_ospeed != old_termios->c_ospeed)
682 cp210x_change_speed(tty, port, old_termios);
684 /* If the number of data bits is to be updated */
685 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
686 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
687 bits &= ~BITS_DATA_MASK;
688 switch (cflag & CSIZE) {
689 case CS5:
690 bits |= BITS_DATA_5;
691 dev_dbg(dev, "%s - data bits = 5\n", __func__);
692 break;
693 case CS6:
694 bits |= BITS_DATA_6;
695 dev_dbg(dev, "%s - data bits = 6\n", __func__);
696 break;
697 case CS7:
698 bits |= BITS_DATA_7;
699 dev_dbg(dev, "%s - data bits = 7\n", __func__);
700 break;
701 case CS8:
702 bits |= BITS_DATA_8;
703 dev_dbg(dev, "%s - data bits = 8\n", __func__);
704 break;
705 /*case CS9:
706 bits |= BITS_DATA_9;
707 dev_dbg(dev, "%s - data bits = 9\n", __func__);
708 break;*/
709 default:
710 dev_dbg(dev, "cp210x driver does not support the number of bits requested, using 8 bit mode\n");
711 bits |= BITS_DATA_8;
712 break;
714 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
715 dev_dbg(dev, "Number of data bits requested not supported by device\n");
718 if ((cflag & (PARENB|PARODD|CMSPAR)) !=
719 (old_cflag & (PARENB|PARODD|CMSPAR))) {
720 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
721 bits &= ~BITS_PARITY_MASK;
722 if (cflag & PARENB) {
723 if (cflag & CMSPAR) {
724 if (cflag & PARODD) {
725 bits |= BITS_PARITY_MARK;
726 dev_dbg(dev, "%s - parity = MARK\n", __func__);
727 } else {
728 bits |= BITS_PARITY_SPACE;
729 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
731 } else {
732 if (cflag & PARODD) {
733 bits |= BITS_PARITY_ODD;
734 dev_dbg(dev, "%s - parity = ODD\n", __func__);
735 } else {
736 bits |= BITS_PARITY_EVEN;
737 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
741 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
742 dev_dbg(dev, "Parity mode not supported by device\n");
745 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
746 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
747 bits &= ~BITS_STOP_MASK;
748 if (cflag & CSTOPB) {
749 bits |= BITS_STOP_2;
750 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
751 } else {
752 bits |= BITS_STOP_1;
753 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
755 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
756 dev_dbg(dev, "Number of stop bits requested not supported by device\n");
759 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
760 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
761 dev_dbg(dev, "%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n",
762 __func__, modem_ctl[0], modem_ctl[1],
763 modem_ctl[2], modem_ctl[3]);
765 if (cflag & CRTSCTS) {
766 modem_ctl[0] &= ~0x7B;
767 modem_ctl[0] |= 0x09;
768 modem_ctl[1] = 0x80;
769 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
770 } else {
771 modem_ctl[0] &= ~0x7B;
772 modem_ctl[0] |= 0x01;
773 modem_ctl[1] |= 0x40;
774 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
777 dev_dbg(dev, "%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n",
778 __func__, modem_ctl[0], modem_ctl[1],
779 modem_ctl[2], modem_ctl[3]);
780 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16);
785 static int cp210x_tiocmset(struct tty_struct *tty,
786 unsigned int set, unsigned int clear)
788 struct usb_serial_port *port = tty->driver_data;
789 return cp210x_tiocmset_port(port, set, clear);
792 static int cp210x_tiocmset_port(struct usb_serial_port *port,
793 unsigned int set, unsigned int clear)
795 unsigned int control = 0;
797 if (set & TIOCM_RTS) {
798 control |= CONTROL_RTS;
799 control |= CONTROL_WRITE_RTS;
801 if (set & TIOCM_DTR) {
802 control |= CONTROL_DTR;
803 control |= CONTROL_WRITE_DTR;
805 if (clear & TIOCM_RTS) {
806 control &= ~CONTROL_RTS;
807 control |= CONTROL_WRITE_RTS;
809 if (clear & TIOCM_DTR) {
810 control &= ~CONTROL_DTR;
811 control |= CONTROL_WRITE_DTR;
814 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
816 return cp210x_set_config(port, CP210X_SET_MHS, &control, 2);
819 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
821 if (on)
822 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
823 else
824 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
827 static int cp210x_tiocmget(struct tty_struct *tty)
829 struct usb_serial_port *port = tty->driver_data;
830 unsigned int control;
831 int result;
833 cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1);
835 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
836 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
837 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
838 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
839 |((control & CONTROL_RING)? TIOCM_RI : 0)
840 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
842 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
844 return result;
847 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
849 struct usb_serial_port *port = tty->driver_data;
850 unsigned int state;
852 if (break_state == 0)
853 state = BREAK_OFF;
854 else
855 state = BREAK_ON;
856 dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
857 state == BREAK_OFF ? "off" : "on");
858 cp210x_set_config(port, CP210X_SET_BREAK, &state, 2);
861 static int cp210x_startup(struct usb_serial *serial)
863 struct usb_host_interface *cur_altsetting;
864 struct cp210x_serial_private *spriv;
866 /* cp210x buffers behave strangely unless device is reset */
867 usb_reset_device(serial->dev);
869 spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
870 if (!spriv)
871 return -ENOMEM;
873 cur_altsetting = serial->interface->cur_altsetting;
874 spriv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber;
876 usb_set_serial_data(serial, spriv);
878 return 0;
881 static void cp210x_release(struct usb_serial *serial)
883 struct cp210x_serial_private *spriv;
885 spriv = usb_get_serial_data(serial);
886 kfree(spriv);
889 module_usb_serial_driver(serial_drivers, id_table);
891 MODULE_DESCRIPTION(DRIVER_DESC);
892 MODULE_LICENSE("GPL");