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_release(struct usb_serial *);
53 static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
57 static const struct usb_device_id id_table[] = {
58 { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */
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(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
62 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
63 { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */
64 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
65 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
66 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
67 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
68 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
69 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
70 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
71 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
72 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
73 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
74 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
75 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
76 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
77 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
78 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
79 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
80 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
81 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
82 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
83 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
84 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
85 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
86 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
87 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
88 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
89 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
90 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
91 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
92 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
93 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
94 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
95 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
96 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
97 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
98 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
99 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
100 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
101 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
102 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
103 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
104 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
105 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
106 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
107 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
108 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
109 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
110 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
111 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
112 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
113 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */
114 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
115 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
116 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
117 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
118 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
119 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
120 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
121 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
122 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
123 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
124 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
125 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
126 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
127 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
128 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
129 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
130 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
131 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
132 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
133 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
134 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
135 { USB_DEVICE(0x10C4, 0xEA80) }, /* Silicon Labs factory default */
136 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
137 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
138 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
139 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
140 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
141 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
142 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
143 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
144 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
145 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
146 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
147 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
148 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
149 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
150 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
151 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
152 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
153 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
154 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
155 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
156 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
157 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
158 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
159 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
160 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
161 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
162 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
163 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
164 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
165 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
166 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
167 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
168 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
169 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
170 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
171 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
172 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
173 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
174 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
175 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
176 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
177 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
178 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
179 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
180 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
181 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
182 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
183 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
184 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
185 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
186 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
187 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
188 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
189 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
190 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
191 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
192 { } /* Terminating Entry */
195 MODULE_DEVICE_TABLE(usb, id_table);
197 struct cp210x_port_private {
198 __u8 bInterfaceNumber;
201 static struct usb_driver cp210x_driver = {
203 .probe = usb_serial_probe,
204 .disconnect = usb_serial_disconnect,
205 .id_table = id_table,
209 static struct usb_serial_driver cp210x_device = {
211 .owner = THIS_MODULE,
214 .usb_driver = &cp210x_driver,
215 .id_table = id_table,
218 .bulk_out_size = 256,
220 .close = cp210x_close,
221 .break_ctl = cp210x_break_ctl,
222 .set_termios = cp210x_set_termios,
223 .tiocmget = cp210x_tiocmget,
224 .tiocmset = cp210x_tiocmset,
225 .attach = cp210x_startup,
226 .release = cp210x_release,
227 .dtr_rts = cp210x_dtr_rts
230 /* Config request types */
231 #define REQTYPE_HOST_TO_DEVICE 0x41
232 #define REQTYPE_DEVICE_TO_HOST 0xc1
234 /* Config request codes */
235 #define CP210X_IFC_ENABLE 0x00
236 #define CP210X_SET_BAUDDIV 0x01
237 #define CP210X_GET_BAUDDIV 0x02
238 #define CP210X_SET_LINE_CTL 0x03
239 #define CP210X_GET_LINE_CTL 0x04
240 #define CP210X_SET_BREAK 0x05
241 #define CP210X_IMM_CHAR 0x06
242 #define CP210X_SET_MHS 0x07
243 #define CP210X_GET_MDMSTS 0x08
244 #define CP210X_SET_XON 0x09
245 #define CP210X_SET_XOFF 0x0A
246 #define CP210X_SET_EVENTMASK 0x0B
247 #define CP210X_GET_EVENTMASK 0x0C
248 #define CP210X_SET_CHAR 0x0D
249 #define CP210X_GET_CHARS 0x0E
250 #define CP210X_GET_PROPS 0x0F
251 #define CP210X_GET_COMM_STATUS 0x10
252 #define CP210X_RESET 0x11
253 #define CP210X_PURGE 0x12
254 #define CP210X_SET_FLOW 0x13
255 #define CP210X_GET_FLOW 0x14
256 #define CP210X_EMBED_EVENTS 0x15
257 #define CP210X_GET_EVENTSTATE 0x16
258 #define CP210X_SET_CHARS 0x19
259 #define CP210X_GET_BAUDRATE 0x1D
260 #define CP210X_SET_BAUDRATE 0x1E
262 /* CP210X_IFC_ENABLE */
263 #define UART_ENABLE 0x0001
264 #define UART_DISABLE 0x0000
266 /* CP210X_(SET|GET)_BAUDDIV */
267 #define BAUD_RATE_GEN_FREQ 0x384000
269 /* CP210X_(SET|GET)_LINE_CTL */
270 #define BITS_DATA_MASK 0X0f00
271 #define BITS_DATA_5 0X0500
272 #define BITS_DATA_6 0X0600
273 #define BITS_DATA_7 0X0700
274 #define BITS_DATA_8 0X0800
275 #define BITS_DATA_9 0X0900
277 #define BITS_PARITY_MASK 0x00f0
278 #define BITS_PARITY_NONE 0x0000
279 #define BITS_PARITY_ODD 0x0010
280 #define BITS_PARITY_EVEN 0x0020
281 #define BITS_PARITY_MARK 0x0030
282 #define BITS_PARITY_SPACE 0x0040
284 #define BITS_STOP_MASK 0x000f
285 #define BITS_STOP_1 0x0000
286 #define BITS_STOP_1_5 0x0001
287 #define BITS_STOP_2 0x0002
289 /* CP210X_SET_BREAK */
290 #define BREAK_ON 0x0001
291 #define BREAK_OFF 0x0000
293 /* CP210X_(SET_MHS|GET_MDMSTS) */
294 #define CONTROL_DTR 0x0001
295 #define CONTROL_RTS 0x0002
296 #define CONTROL_CTS 0x0010
297 #define CONTROL_DSR 0x0020
298 #define CONTROL_RING 0x0040
299 #define CONTROL_DCD 0x0080
300 #define CONTROL_WRITE_DTR 0x0100
301 #define CONTROL_WRITE_RTS 0x0200
305 * Reads from the CP210x configuration registers
306 * 'size' is specified in bytes.
307 * 'data' is a pointer to a pre-allocated array of integers large
308 * enough to hold 'size' bytes (with 4 bytes to each integer)
310 static int cp210x_get_config(struct usb_serial_port *port, u8 request,
311 unsigned int *data, int size)
313 struct usb_serial *serial = port->serial;
314 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
316 int result, i, length;
318 /* Number of integers required to contain the array */
319 length = (((size - 1) | 3) + 1)/4;
321 buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
323 dev_err(&port->dev, "%s - out of memory.\n", __func__);
327 /* Issue the request, attempting to read 'size' bytes */
328 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
329 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
330 port_priv->bInterfaceNumber, buf, size,
331 USB_CTRL_GET_TIMEOUT);
333 /* Convert data into an array of integers */
334 for (i = 0; i < length; i++)
335 data[i] = le32_to_cpu(buf[i]);
339 if (result != size) {
340 dbg("%s - Unable to send config request, "
341 "request=0x%x size=%d result=%d\n",
342 __func__, request, size, result);
351 * Writes to the CP210x configuration registers
352 * Values less than 16 bits wide are sent directly
353 * 'size' is specified in bytes.
355 static int cp210x_set_config(struct usb_serial_port *port, u8 request,
356 unsigned int *data, int size)
358 struct usb_serial *serial = port->serial;
359 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
361 int result, i, length;
363 /* Number of integers required to contain the array */
364 length = (((size - 1) | 3) + 1)/4;
366 buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
368 dev_err(&port->dev, "%s - out of memory.\n",
373 /* Array of integers into bytes */
374 for (i = 0; i < length; i++)
375 buf[i] = cpu_to_le32(data[i]);
378 result = usb_control_msg(serial->dev,
379 usb_sndctrlpipe(serial->dev, 0),
380 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
381 port_priv->bInterfaceNumber, buf, size,
382 USB_CTRL_SET_TIMEOUT);
384 result = usb_control_msg(serial->dev,
385 usb_sndctrlpipe(serial->dev, 0),
386 request, REQTYPE_HOST_TO_DEVICE, data[0],
387 port_priv->bInterfaceNumber, NULL, 0,
388 USB_CTRL_SET_TIMEOUT);
393 if ((size > 2 && result != size) || result < 0) {
394 dbg("%s - Unable to send request, "
395 "request=0x%x size=%d result=%d\n",
396 __func__, request, size, result);
404 * cp210x_set_config_single
405 * Convenience function for calling cp210x_set_config on single data values
406 * without requiring an integer pointer
408 static inline int cp210x_set_config_single(struct usb_serial_port *port,
409 u8 request, unsigned int data)
411 return cp210x_set_config(port, request, &data, 2);
415 * cp210x_quantise_baudrate
416 * Quantises the baud rate as per AN205 Table 1
418 static unsigned int cp210x_quantise_baudrate(unsigned int baud) {
421 else if (baud <= 600) baud = 600;
422 else if (baud <= 1200) baud = 1200;
423 else if (baud <= 1800) baud = 1800;
424 else if (baud <= 2400) baud = 2400;
425 else if (baud <= 4000) baud = 4000;
426 else if (baud <= 4803) baud = 4800;
427 else if (baud <= 7207) baud = 7200;
428 else if (baud <= 9612) baud = 9600;
429 else if (baud <= 14428) baud = 14400;
430 else if (baud <= 16062) baud = 16000;
431 else if (baud <= 19250) baud = 19200;
432 else if (baud <= 28912) baud = 28800;
433 else if (baud <= 38601) baud = 38400;
434 else if (baud <= 51558) baud = 51200;
435 else if (baud <= 56280) baud = 56000;
436 else if (baud <= 58053) baud = 57600;
437 else if (baud <= 64111) baud = 64000;
438 else if (baud <= 77608) baud = 76800;
439 else if (baud <= 117028) baud = 115200;
440 else if (baud <= 129347) baud = 128000;
441 else if (baud <= 156868) baud = 153600;
442 else if (baud <= 237832) baud = 230400;
443 else if (baud <= 254234) baud = 250000;
444 else if (baud <= 273066) baud = 256000;
445 else if (baud <= 491520) baud = 460800;
446 else if (baud <= 567138) baud = 500000;
447 else if (baud <= 670254) baud = 576000;
448 else if (baud < 1000000)
450 else if (baud > 2000000)
455 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
457 dbg("%s - port %d", __func__, port->number);
459 if (cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_ENABLE)) {
460 dev_err(&port->dev, "%s - Unable to enable UART\n",
465 /* Configure the termios structure */
466 cp210x_get_termios(tty, port);
468 /* The baud rate must be initialised on cp2104 */
470 cp210x_change_speed(tty, port, NULL);
472 return usb_serial_generic_open(tty, port);
475 static void cp210x_close(struct usb_serial_port *port)
477 dbg("%s - port %d", __func__, port->number);
479 usb_serial_generic_close(port);
481 mutex_lock(&port->serial->disc_mutex);
482 if (!port->serial->disconnected)
483 cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE);
484 mutex_unlock(&port->serial->disc_mutex);
489 * Reads the baud rate, data bits, parity, stop bits and flow control mode
490 * from the device, corrects any unsupported values, and configures the
491 * termios structure to reflect the state of the device
493 static void cp210x_get_termios(struct tty_struct *tty,
494 struct usb_serial_port *port)
499 cp210x_get_termios_port(tty->driver_data,
500 &tty->termios->c_cflag, &baud);
501 tty_encode_baud_rate(tty, baud, baud);
507 cp210x_get_termios_port(port, &cflag, &baud);
512 * cp210x_get_termios_port
513 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
515 static void cp210x_get_termios_port(struct usb_serial_port *port,
516 unsigned int *cflagp, unsigned int *baudp)
518 unsigned int cflag, modem_ctl[4];
522 dbg("%s - port %d", __func__, port->number);
524 cp210x_get_config(port, CP210X_GET_BAUDRATE, &baud, 4);
526 dbg("%s - baud rate = %d", __func__, baud);
531 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
533 switch (bits & BITS_DATA_MASK) {
535 dbg("%s - data bits = 5", __func__);
539 dbg("%s - data bits = 6", __func__);
543 dbg("%s - data bits = 7", __func__);
547 dbg("%s - data bits = 8", __func__);
551 dbg("%s - data bits = 9 (not supported, using 8 data bits)",
554 bits &= ~BITS_DATA_MASK;
556 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
559 dbg("%s - Unknown number of data bits, using 8", __func__);
561 bits &= ~BITS_DATA_MASK;
563 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
567 switch (bits & BITS_PARITY_MASK) {
568 case BITS_PARITY_NONE:
569 dbg("%s - parity = NONE", __func__);
572 case BITS_PARITY_ODD:
573 dbg("%s - parity = ODD", __func__);
574 cflag |= (PARENB|PARODD);
576 case BITS_PARITY_EVEN:
577 dbg("%s - parity = EVEN", __func__);
581 case BITS_PARITY_MARK:
582 dbg("%s - parity = MARK (not supported, disabling parity)",
585 bits &= ~BITS_PARITY_MASK;
586 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
588 case BITS_PARITY_SPACE:
589 dbg("%s - parity = SPACE (not supported, disabling parity)",
592 bits &= ~BITS_PARITY_MASK;
593 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
596 dbg("%s - Unknown parity mode, disabling parity", __func__);
598 bits &= ~BITS_PARITY_MASK;
599 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
604 switch (bits & BITS_STOP_MASK) {
606 dbg("%s - stop bits = 1", __func__);
609 dbg("%s - stop bits = 1.5 (not supported, using 1 stop bit)",
611 bits &= ~BITS_STOP_MASK;
612 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
615 dbg("%s - stop bits = 2", __func__);
619 dbg("%s - Unknown number of stop bits, using 1 stop bit",
621 bits &= ~BITS_STOP_MASK;
622 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
626 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
627 if (modem_ctl[0] & 0x0008) {
628 dbg("%s - flow control = CRTSCTS", __func__);
631 dbg("%s - flow control = NONE", __func__);
639 * CP2101 supports the following baud rates:
641 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
642 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
644 * CP2102 and CP2103 support the following additional rates:
646 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
649 * The device will map a requested rate to a supported one, but the result
650 * of requests for rates greater than 1053257 is undefined (see AN205).
652 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
653 * respectively, with an error less than 1%. The actual rates are determined
656 * div = round(freq / (2 x prescale x request))
657 * actual = freq / (2 x prescale x div)
659 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
661 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
664 static void cp210x_change_speed(struct tty_struct *tty,
665 struct usb_serial_port *port, struct ktermios *old_termios)
669 baud = tty->termios->c_ospeed;
671 /* This maps the requested rate to a rate valid on cp2102 or cp2103,
672 * or to an arbitrary rate in [1M,2M].
674 * NOTE: B0 is not implemented.
676 baud = cp210x_quantise_baudrate(baud);
678 dbg("%s - setting baud rate to %u", __func__, baud);
679 if (cp210x_set_config(port, CP210X_SET_BAUDRATE, &baud,
681 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
683 baud = old_termios->c_ospeed;
688 tty_encode_baud_rate(tty, baud, baud);
691 static void cp210x_set_termios(struct tty_struct *tty,
692 struct usb_serial_port *port, struct ktermios *old_termios)
694 unsigned int cflag, old_cflag;
696 unsigned int modem_ctl[4];
698 dbg("%s - port %d", __func__, port->number);
703 tty->termios->c_cflag &= ~CMSPAR;
704 cflag = tty->termios->c_cflag;
705 old_cflag = old_termios->c_cflag;
707 if (tty->termios->c_ospeed != old_termios->c_ospeed)
708 cp210x_change_speed(tty, port, old_termios);
710 /* If the number of data bits is to be updated */
711 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
712 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
713 bits &= ~BITS_DATA_MASK;
714 switch (cflag & CSIZE) {
717 dbg("%s - data bits = 5", __func__);
721 dbg("%s - data bits = 6", __func__);
725 dbg("%s - data bits = 7", __func__);
729 dbg("%s - data bits = 8", __func__);
733 dbg("%s - data bits = 9", __func__);
736 dbg("cp210x driver does not "
737 "support the number of bits requested,"
738 " using 8 bit mode\n");
742 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
743 dbg("Number of data bits requested "
744 "not supported by device\n");
747 if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
748 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
749 bits &= ~BITS_PARITY_MASK;
750 if (cflag & PARENB) {
751 if (cflag & PARODD) {
752 bits |= BITS_PARITY_ODD;
753 dbg("%s - parity = ODD", __func__);
755 bits |= BITS_PARITY_EVEN;
756 dbg("%s - parity = EVEN", __func__);
759 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
760 dbg("Parity mode not supported "
764 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
765 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
766 bits &= ~BITS_STOP_MASK;
767 if (cflag & CSTOPB) {
769 dbg("%s - stop bits = 2", __func__);
772 dbg("%s - stop bits = 1", __func__);
774 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
775 dbg("Number of stop bits requested "
776 "not supported by device\n");
779 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
780 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
781 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
782 __func__, modem_ctl[0], modem_ctl[1],
783 modem_ctl[2], modem_ctl[3]);
785 if (cflag & CRTSCTS) {
786 modem_ctl[0] &= ~0x7B;
787 modem_ctl[0] |= 0x09;
789 dbg("%s - flow control = CRTSCTS", __func__);
791 modem_ctl[0] &= ~0x7B;
792 modem_ctl[0] |= 0x01;
793 modem_ctl[1] |= 0x40;
794 dbg("%s - flow control = NONE", __func__);
797 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
798 __func__, modem_ctl[0], modem_ctl[1],
799 modem_ctl[2], modem_ctl[3]);
800 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16);
805 static int cp210x_tiocmset (struct tty_struct *tty,
806 unsigned int set, unsigned int clear)
808 struct usb_serial_port *port = tty->driver_data;
809 return cp210x_tiocmset_port(port, set, clear);
812 static int cp210x_tiocmset_port(struct usb_serial_port *port,
813 unsigned int set, unsigned int clear)
815 unsigned int control = 0;
817 dbg("%s - port %d", __func__, port->number);
819 if (set & TIOCM_RTS) {
820 control |= CONTROL_RTS;
821 control |= CONTROL_WRITE_RTS;
823 if (set & TIOCM_DTR) {
824 control |= CONTROL_DTR;
825 control |= CONTROL_WRITE_DTR;
827 if (clear & TIOCM_RTS) {
828 control &= ~CONTROL_RTS;
829 control |= CONTROL_WRITE_RTS;
831 if (clear & TIOCM_DTR) {
832 control &= ~CONTROL_DTR;
833 control |= CONTROL_WRITE_DTR;
836 dbg("%s - control = 0x%.4x", __func__, control);
838 return cp210x_set_config(port, CP210X_SET_MHS, &control, 2);
841 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
844 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
846 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
849 static int cp210x_tiocmget (struct tty_struct *tty)
851 struct usb_serial_port *port = tty->driver_data;
852 unsigned int control;
855 dbg("%s - port %d", __func__, port->number);
857 cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1);
859 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
860 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
861 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
862 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
863 |((control & CONTROL_RING)? TIOCM_RI : 0)
864 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
866 dbg("%s - control = 0x%.2x", __func__, control);
871 static void cp210x_break_ctl (struct tty_struct *tty, int break_state)
873 struct usb_serial_port *port = tty->driver_data;
876 dbg("%s - port %d", __func__, port->number);
877 if (break_state == 0)
881 dbg("%s - turning break %s", __func__,
882 state == BREAK_OFF ? "off" : "on");
883 cp210x_set_config(port, CP210X_SET_BREAK, &state, 2);
886 static int cp210x_startup(struct usb_serial *serial)
888 struct cp210x_port_private *port_priv;
891 /* cp210x buffers behave strangely unless device is reset */
892 usb_reset_device(serial->dev);
894 for (i = 0; i < serial->num_ports; i++) {
895 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
899 memset(port_priv, 0x00, sizeof(*port_priv));
900 port_priv->bInterfaceNumber =
901 serial->interface->cur_altsetting->desc.bInterfaceNumber;
903 usb_set_serial_port_data(serial->port[i], port_priv);
909 static void cp210x_release(struct usb_serial *serial)
911 struct cp210x_port_private *port_priv;
914 for (i = 0; i < serial->num_ports; i++) {
915 port_priv = usb_get_serial_port_data(serial->port[i]);
917 usb_set_serial_port_data(serial->port[i], NULL);
921 static int __init cp210x_init(void)
925 retval = usb_serial_register(&cp210x_device);
927 return retval; /* Failed to register */
929 retval = usb_register(&cp210x_driver);
931 /* Failed to register */
932 usb_serial_deregister(&cp210x_device);
937 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
942 static void __exit cp210x_exit(void)
944 usb_deregister(&cp210x_driver);
945 usb_serial_deregister(&cp210x_device);
948 module_init(cp210x_init);
949 module_exit(cp210x_exit);
951 MODULE_DESCRIPTION(DRIVER_DESC);
952 MODULE_VERSION(DRIVER_VERSION);
953 MODULE_LICENSE("GPL");
955 module_param(debug, bool, S_IRUGO | S_IWUSR);
956 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");