ACPI / LPSS: make code less confusing for reader
[deliverable/linux.git] / drivers / usb / serial / cp210x.c
1 /*
2 * Silicon Laboratories CP210x USB to RS232 serial adaptor driver
3 *
4 * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License version
8 * 2 as published by the Free Software Foundation.
9 *
10 * Support to set flow control line levels using TIOCMGET and TIOCMSET
11 * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow
12 * control thanks to Munir Nassar nassarmu@real-time.com
13 *
14 */
15
16 #include <linux/kernel.h>
17 #include <linux/errno.h>
18 #include <linux/slab.h>
19 #include <linux/tty.h>
20 #include <linux/tty_flip.h>
21 #include <linux/module.h>
22 #include <linux/moduleparam.h>
23 #include <linux/usb.h>
24 #include <linux/uaccess.h>
25 #include <linux/usb/serial.h>
26
27 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
28
29 /*
30 * Function Prototypes
31 */
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);
49
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(0x10C4, 0x8156) }, /* B&G H3000 link cable */
89 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
90 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
91 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
92 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
93 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
94 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
95 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
96 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
97 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
98 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
99 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
100 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
101 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
102 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
103 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
104 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
105 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
106 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
107 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
108 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
109 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
110 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
111 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
112 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
113 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
114 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
115 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
116 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
117 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
118 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
119 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
120 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
121 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
122 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
123 { USB_DEVICE(0x10C4, 0xEA80) }, /* 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, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
134 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
135 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
136 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
137 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
138 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
139 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
140 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
141 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
142 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
143 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
144 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
145 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
146 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
147 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
148 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
149 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
150 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
151 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
152 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
153 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
154 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
155 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
156 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
157 { } /* Terminating Entry */
158 };
159
160 MODULE_DEVICE_TABLE(usb, id_table);
161
162 struct cp210x_serial_private {
163 __u8 bInterfaceNumber;
164 };
165
166 static struct usb_serial_driver cp210x_device = {
167 .driver = {
168 .owner = THIS_MODULE,
169 .name = "cp210x",
170 },
171 .id_table = id_table,
172 .num_ports = 1,
173 .bulk_in_size = 256,
174 .bulk_out_size = 256,
175 .open = cp210x_open,
176 .close = cp210x_close,
177 .break_ctl = cp210x_break_ctl,
178 .set_termios = cp210x_set_termios,
179 .tiocmget = cp210x_tiocmget,
180 .tiocmset = cp210x_tiocmset,
181 .attach = cp210x_startup,
182 .release = cp210x_release,
183 .dtr_rts = cp210x_dtr_rts
184 };
185
186 static struct usb_serial_driver * const serial_drivers[] = {
187 &cp210x_device, NULL
188 };
189
190 /* Config request types */
191 #define REQTYPE_HOST_TO_INTERFACE 0x41
192 #define REQTYPE_INTERFACE_TO_HOST 0xc1
193 #define REQTYPE_HOST_TO_DEVICE 0x40
194 #define REQTYPE_DEVICE_TO_HOST 0xc0
195
196 /* Config request codes */
197 #define CP210X_IFC_ENABLE 0x00
198 #define CP210X_SET_BAUDDIV 0x01
199 #define CP210X_GET_BAUDDIV 0x02
200 #define CP210X_SET_LINE_CTL 0x03
201 #define CP210X_GET_LINE_CTL 0x04
202 #define CP210X_SET_BREAK 0x05
203 #define CP210X_IMM_CHAR 0x06
204 #define CP210X_SET_MHS 0x07
205 #define CP210X_GET_MDMSTS 0x08
206 #define CP210X_SET_XON 0x09
207 #define CP210X_SET_XOFF 0x0A
208 #define CP210X_SET_EVENTMASK 0x0B
209 #define CP210X_GET_EVENTMASK 0x0C
210 #define CP210X_SET_CHAR 0x0D
211 #define CP210X_GET_CHARS 0x0E
212 #define CP210X_GET_PROPS 0x0F
213 #define CP210X_GET_COMM_STATUS 0x10
214 #define CP210X_RESET 0x11
215 #define CP210X_PURGE 0x12
216 #define CP210X_SET_FLOW 0x13
217 #define CP210X_GET_FLOW 0x14
218 #define CP210X_EMBED_EVENTS 0x15
219 #define CP210X_GET_EVENTSTATE 0x16
220 #define CP210X_SET_CHARS 0x19
221 #define CP210X_GET_BAUDRATE 0x1D
222 #define CP210X_SET_BAUDRATE 0x1E
223
224 /* CP210X_IFC_ENABLE */
225 #define UART_ENABLE 0x0001
226 #define UART_DISABLE 0x0000
227
228 /* CP210X_(SET|GET)_BAUDDIV */
229 #define BAUD_RATE_GEN_FREQ 0x384000
230
231 /* CP210X_(SET|GET)_LINE_CTL */
232 #define BITS_DATA_MASK 0X0f00
233 #define BITS_DATA_5 0X0500
234 #define BITS_DATA_6 0X0600
235 #define BITS_DATA_7 0X0700
236 #define BITS_DATA_8 0X0800
237 #define BITS_DATA_9 0X0900
238
239 #define BITS_PARITY_MASK 0x00f0
240 #define BITS_PARITY_NONE 0x0000
241 #define BITS_PARITY_ODD 0x0010
242 #define BITS_PARITY_EVEN 0x0020
243 #define BITS_PARITY_MARK 0x0030
244 #define BITS_PARITY_SPACE 0x0040
245
246 #define BITS_STOP_MASK 0x000f
247 #define BITS_STOP_1 0x0000
248 #define BITS_STOP_1_5 0x0001
249 #define BITS_STOP_2 0x0002
250
251 /* CP210X_SET_BREAK */
252 #define BREAK_ON 0x0001
253 #define BREAK_OFF 0x0000
254
255 /* CP210X_(SET_MHS|GET_MDMSTS) */
256 #define CONTROL_DTR 0x0001
257 #define CONTROL_RTS 0x0002
258 #define CONTROL_CTS 0x0010
259 #define CONTROL_DSR 0x0020
260 #define CONTROL_RING 0x0040
261 #define CONTROL_DCD 0x0080
262 #define CONTROL_WRITE_DTR 0x0100
263 #define CONTROL_WRITE_RTS 0x0200
264
265 /*
266 * cp210x_get_config
267 * Reads from the CP210x configuration registers
268 * 'size' is specified in bytes.
269 * 'data' is a pointer to a pre-allocated array of integers large
270 * enough to hold 'size' bytes (with 4 bytes to each integer)
271 */
272 static int cp210x_get_config(struct usb_serial_port *port, u8 request,
273 unsigned int *data, int size)
274 {
275 struct usb_serial *serial = port->serial;
276 struct cp210x_serial_private *spriv = usb_get_serial_data(serial);
277 __le32 *buf;
278 int result, i, length;
279
280 /* Number of integers required to contain the array */
281 length = (((size - 1) | 3) + 1) / 4;
282
283 buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
284 if (!buf) {
285 dev_err(&port->dev, "%s - out of memory.\n", __func__);
286 return -ENOMEM;
287 }
288
289 /* Issue the request, attempting to read 'size' bytes */
290 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
291 request, REQTYPE_INTERFACE_TO_HOST, 0x0000,
292 spriv->bInterfaceNumber, buf, size,
293 USB_CTRL_GET_TIMEOUT);
294
295 /* Convert data into an array of integers */
296 for (i = 0; i < length; i++)
297 data[i] = le32_to_cpu(buf[i]);
298
299 kfree(buf);
300
301 if (result != size) {
302 dev_dbg(&port->dev, "%s - Unable to send config request, request=0x%x size=%d result=%d\n",
303 __func__, request, size, result);
304 if (result > 0)
305 result = -EPROTO;
306
307 return result;
308 }
309
310 return 0;
311 }
312
313 /*
314 * cp210x_set_config
315 * Writes to the CP210x configuration registers
316 * Values less than 16 bits wide are sent directly
317 * 'size' is specified in bytes.
318 */
319 static int cp210x_set_config(struct usb_serial_port *port, u8 request,
320 unsigned int *data, int size)
321 {
322 struct usb_serial *serial = port->serial;
323 struct cp210x_serial_private *spriv = usb_get_serial_data(serial);
324 __le32 *buf;
325 int result, i, length;
326
327 /* Number of integers required to contain the array */
328 length = (((size - 1) | 3) + 1) / 4;
329
330 buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
331 if (!buf) {
332 dev_err(&port->dev, "%s - out of memory.\n", __func__);
333 return -ENOMEM;
334 }
335
336 /* Array of integers into bytes */
337 for (i = 0; i < length; i++)
338 buf[i] = cpu_to_le32(data[i]);
339
340 if (size > 2) {
341 result = usb_control_msg(serial->dev,
342 usb_sndctrlpipe(serial->dev, 0),
343 request, REQTYPE_HOST_TO_INTERFACE, 0x0000,
344 spriv->bInterfaceNumber, buf, size,
345 USB_CTRL_SET_TIMEOUT);
346 } else {
347 result = usb_control_msg(serial->dev,
348 usb_sndctrlpipe(serial->dev, 0),
349 request, REQTYPE_HOST_TO_INTERFACE, data[0],
350 spriv->bInterfaceNumber, NULL, 0,
351 USB_CTRL_SET_TIMEOUT);
352 }
353
354 kfree(buf);
355
356 if ((size > 2 && result != size) || result < 0) {
357 dev_dbg(&port->dev, "%s - Unable to send request, request=0x%x size=%d result=%d\n",
358 __func__, request, size, result);
359 if (result > 0)
360 result = -EPROTO;
361
362 return result;
363 }
364
365 return 0;
366 }
367
368 /*
369 * cp210x_set_config_single
370 * Convenience function for calling cp210x_set_config on single data values
371 * without requiring an integer pointer
372 */
373 static inline int cp210x_set_config_single(struct usb_serial_port *port,
374 u8 request, unsigned int data)
375 {
376 return cp210x_set_config(port, request, &data, 2);
377 }
378
379 /*
380 * cp210x_quantise_baudrate
381 * Quantises the baud rate as per AN205 Table 1
382 */
383 static unsigned int cp210x_quantise_baudrate(unsigned int baud)
384 {
385 if (baud <= 300)
386 baud = 300;
387 else if (baud <= 600) baud = 600;
388 else if (baud <= 1200) baud = 1200;
389 else if (baud <= 1800) baud = 1800;
390 else if (baud <= 2400) baud = 2400;
391 else if (baud <= 4000) baud = 4000;
392 else if (baud <= 4803) baud = 4800;
393 else if (baud <= 7207) baud = 7200;
394 else if (baud <= 9612) baud = 9600;
395 else if (baud <= 14428) baud = 14400;
396 else if (baud <= 16062) baud = 16000;
397 else if (baud <= 19250) baud = 19200;
398 else if (baud <= 28912) baud = 28800;
399 else if (baud <= 38601) baud = 38400;
400 else if (baud <= 51558) baud = 51200;
401 else if (baud <= 56280) baud = 56000;
402 else if (baud <= 58053) baud = 57600;
403 else if (baud <= 64111) baud = 64000;
404 else if (baud <= 77608) baud = 76800;
405 else if (baud <= 117028) baud = 115200;
406 else if (baud <= 129347) baud = 128000;
407 else if (baud <= 156868) baud = 153600;
408 else if (baud <= 237832) baud = 230400;
409 else if (baud <= 254234) baud = 250000;
410 else if (baud <= 273066) baud = 256000;
411 else if (baud <= 491520) baud = 460800;
412 else if (baud <= 567138) baud = 500000;
413 else if (baud <= 670254) baud = 576000;
414 else if (baud < 1000000)
415 baud = 921600;
416 else if (baud > 2000000)
417 baud = 2000000;
418 return baud;
419 }
420
421 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
422 {
423 int result;
424
425 result = cp210x_set_config_single(port, CP210X_IFC_ENABLE,
426 UART_ENABLE);
427 if (result) {
428 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
429 return result;
430 }
431
432 /* Configure the termios structure */
433 cp210x_get_termios(tty, port);
434
435 /* The baud rate must be initialised on cp2104 */
436 if (tty)
437 cp210x_change_speed(tty, port, NULL);
438
439 return usb_serial_generic_open(tty, port);
440 }
441
442 static void cp210x_close(struct usb_serial_port *port)
443 {
444 usb_serial_generic_close(port);
445
446 mutex_lock(&port->serial->disc_mutex);
447 if (!port->serial->disconnected)
448 cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE);
449 mutex_unlock(&port->serial->disc_mutex);
450 }
451
452 /*
453 * cp210x_get_termios
454 * Reads the baud rate, data bits, parity, stop bits and flow control mode
455 * from the device, corrects any unsupported values, and configures the
456 * termios structure to reflect the state of the device
457 */
458 static void cp210x_get_termios(struct tty_struct *tty,
459 struct usb_serial_port *port)
460 {
461 unsigned int baud;
462
463 if (tty) {
464 cp210x_get_termios_port(tty->driver_data,
465 &tty->termios.c_cflag, &baud);
466 tty_encode_baud_rate(tty, baud, baud);
467 } else {
468 unsigned int cflag;
469 cflag = 0;
470 cp210x_get_termios_port(port, &cflag, &baud);
471 }
472 }
473
474 /*
475 * cp210x_get_termios_port
476 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
477 */
478 static void cp210x_get_termios_port(struct usb_serial_port *port,
479 unsigned int *cflagp, unsigned int *baudp)
480 {
481 struct device *dev = &port->dev;
482 unsigned int cflag, modem_ctl[4];
483 unsigned int baud;
484 unsigned int bits;
485
486 cp210x_get_config(port, CP210X_GET_BAUDRATE, &baud, 4);
487
488 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
489 *baudp = baud;
490
491 cflag = *cflagp;
492
493 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
494 cflag &= ~CSIZE;
495 switch (bits & BITS_DATA_MASK) {
496 case BITS_DATA_5:
497 dev_dbg(dev, "%s - data bits = 5\n", __func__);
498 cflag |= CS5;
499 break;
500 case BITS_DATA_6:
501 dev_dbg(dev, "%s - data bits = 6\n", __func__);
502 cflag |= CS6;
503 break;
504 case BITS_DATA_7:
505 dev_dbg(dev, "%s - data bits = 7\n", __func__);
506 cflag |= CS7;
507 break;
508 case BITS_DATA_8:
509 dev_dbg(dev, "%s - data bits = 8\n", __func__);
510 cflag |= CS8;
511 break;
512 case BITS_DATA_9:
513 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __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 default:
520 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
521 cflag |= CS8;
522 bits &= ~BITS_DATA_MASK;
523 bits |= BITS_DATA_8;
524 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
525 break;
526 }
527
528 switch (bits & BITS_PARITY_MASK) {
529 case BITS_PARITY_NONE:
530 dev_dbg(dev, "%s - parity = NONE\n", __func__);
531 cflag &= ~PARENB;
532 break;
533 case BITS_PARITY_ODD:
534 dev_dbg(dev, "%s - parity = ODD\n", __func__);
535 cflag |= (PARENB|PARODD);
536 break;
537 case BITS_PARITY_EVEN:
538 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
539 cflag &= ~PARODD;
540 cflag |= PARENB;
541 break;
542 case BITS_PARITY_MARK:
543 dev_dbg(dev, "%s - parity = MARK\n", __func__);
544 cflag |= (PARENB|PARODD|CMSPAR);
545 break;
546 case BITS_PARITY_SPACE:
547 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
548 cflag &= ~PARODD;
549 cflag |= (PARENB|CMSPAR);
550 break;
551 default:
552 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
553 cflag &= ~PARENB;
554 bits &= ~BITS_PARITY_MASK;
555 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
556 break;
557 }
558
559 cflag &= ~CSTOPB;
560 switch (bits & BITS_STOP_MASK) {
561 case BITS_STOP_1:
562 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
563 break;
564 case BITS_STOP_1_5:
565 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
566 bits &= ~BITS_STOP_MASK;
567 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
568 break;
569 case BITS_STOP_2:
570 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
571 cflag |= CSTOPB;
572 break;
573 default:
574 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
575 bits &= ~BITS_STOP_MASK;
576 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
577 break;
578 }
579
580 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
581 if (modem_ctl[0] & 0x0008) {
582 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
583 cflag |= CRTSCTS;
584 } else {
585 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
586 cflag &= ~CRTSCTS;
587 }
588
589 *cflagp = cflag;
590 }
591
592 /*
593 * CP2101 supports the following baud rates:
594 *
595 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
596 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
597 *
598 * CP2102 and CP2103 support the following additional rates:
599 *
600 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
601 * 576000
602 *
603 * The device will map a requested rate to a supported one, but the result
604 * of requests for rates greater than 1053257 is undefined (see AN205).
605 *
606 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
607 * respectively, with an error less than 1%. The actual rates are determined
608 * by
609 *
610 * div = round(freq / (2 x prescale x request))
611 * actual = freq / (2 x prescale x div)
612 *
613 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
614 * or 1 otherwise.
615 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
616 * otherwise.
617 */
618 static void cp210x_change_speed(struct tty_struct *tty,
619 struct usb_serial_port *port, struct ktermios *old_termios)
620 {
621 u32 baud;
622
623 baud = tty->termios.c_ospeed;
624
625 /* This maps the requested rate to a rate valid on cp2102 or cp2103,
626 * or to an arbitrary rate in [1M,2M].
627 *
628 * NOTE: B0 is not implemented.
629 */
630 baud = cp210x_quantise_baudrate(baud);
631
632 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
633 if (cp210x_set_config(port, CP210X_SET_BAUDRATE, &baud,
634 sizeof(baud))) {
635 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
636 if (old_termios)
637 baud = old_termios->c_ospeed;
638 else
639 baud = 9600;
640 }
641
642 tty_encode_baud_rate(tty, baud, baud);
643 }
644
645 static void cp210x_set_termios(struct tty_struct *tty,
646 struct usb_serial_port *port, struct ktermios *old_termios)
647 {
648 struct device *dev = &port->dev;
649 unsigned int cflag, old_cflag;
650 unsigned int bits;
651 unsigned int modem_ctl[4];
652
653 dev_dbg(dev, "%s - port %d\n", __func__, port->number);
654
655 if (!tty)
656 return;
657
658 cflag = tty->termios.c_cflag;
659 old_cflag = old_termios->c_cflag;
660
661 if (tty->termios.c_ospeed != old_termios->c_ospeed)
662 cp210x_change_speed(tty, port, old_termios);
663
664 /* If the number of data bits is to be updated */
665 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
666 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
667 bits &= ~BITS_DATA_MASK;
668 switch (cflag & CSIZE) {
669 case CS5:
670 bits |= BITS_DATA_5;
671 dev_dbg(dev, "%s - data bits = 5\n", __func__);
672 break;
673 case CS6:
674 bits |= BITS_DATA_6;
675 dev_dbg(dev, "%s - data bits = 6\n", __func__);
676 break;
677 case CS7:
678 bits |= BITS_DATA_7;
679 dev_dbg(dev, "%s - data bits = 7\n", __func__);
680 break;
681 case CS8:
682 bits |= BITS_DATA_8;
683 dev_dbg(dev, "%s - data bits = 8\n", __func__);
684 break;
685 /*case CS9:
686 bits |= BITS_DATA_9;
687 dev_dbg(dev, "%s - data bits = 9\n", __func__);
688 break;*/
689 default:
690 dev_dbg(dev, "cp210x driver does not support the number of bits requested, using 8 bit mode\n");
691 bits |= BITS_DATA_8;
692 break;
693 }
694 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
695 dev_dbg(dev, "Number of data bits requested not supported by device\n");
696 }
697
698 if ((cflag & (PARENB|PARODD|CMSPAR)) !=
699 (old_cflag & (PARENB|PARODD|CMSPAR))) {
700 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
701 bits &= ~BITS_PARITY_MASK;
702 if (cflag & PARENB) {
703 if (cflag & CMSPAR) {
704 if (cflag & PARODD) {
705 bits |= BITS_PARITY_MARK;
706 dev_dbg(dev, "%s - parity = MARK\n", __func__);
707 } else {
708 bits |= BITS_PARITY_SPACE;
709 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
710 }
711 } else {
712 if (cflag & PARODD) {
713 bits |= BITS_PARITY_ODD;
714 dev_dbg(dev, "%s - parity = ODD\n", __func__);
715 } else {
716 bits |= BITS_PARITY_EVEN;
717 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
718 }
719 }
720 }
721 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
722 dev_dbg(dev, "Parity mode not supported by device\n");
723 }
724
725 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
726 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
727 bits &= ~BITS_STOP_MASK;
728 if (cflag & CSTOPB) {
729 bits |= BITS_STOP_2;
730 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
731 } else {
732 bits |= BITS_STOP_1;
733 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
734 }
735 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
736 dev_dbg(dev, "Number of stop bits requested not supported by device\n");
737 }
738
739 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
740 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
741 dev_dbg(dev, "%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n",
742 __func__, modem_ctl[0], modem_ctl[1],
743 modem_ctl[2], modem_ctl[3]);
744
745 if (cflag & CRTSCTS) {
746 modem_ctl[0] &= ~0x7B;
747 modem_ctl[0] |= 0x09;
748 modem_ctl[1] = 0x80;
749 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
750 } else {
751 modem_ctl[0] &= ~0x7B;
752 modem_ctl[0] |= 0x01;
753 modem_ctl[1] |= 0x40;
754 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
755 }
756
757 dev_dbg(dev, "%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n",
758 __func__, modem_ctl[0], modem_ctl[1],
759 modem_ctl[2], modem_ctl[3]);
760 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16);
761 }
762
763 }
764
765 static int cp210x_tiocmset(struct tty_struct *tty,
766 unsigned int set, unsigned int clear)
767 {
768 struct usb_serial_port *port = tty->driver_data;
769 return cp210x_tiocmset_port(port, set, clear);
770 }
771
772 static int cp210x_tiocmset_port(struct usb_serial_port *port,
773 unsigned int set, unsigned int clear)
774 {
775 unsigned int control = 0;
776
777 if (set & TIOCM_RTS) {
778 control |= CONTROL_RTS;
779 control |= CONTROL_WRITE_RTS;
780 }
781 if (set & TIOCM_DTR) {
782 control |= CONTROL_DTR;
783 control |= CONTROL_WRITE_DTR;
784 }
785 if (clear & TIOCM_RTS) {
786 control &= ~CONTROL_RTS;
787 control |= CONTROL_WRITE_RTS;
788 }
789 if (clear & TIOCM_DTR) {
790 control &= ~CONTROL_DTR;
791 control |= CONTROL_WRITE_DTR;
792 }
793
794 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
795
796 return cp210x_set_config(port, CP210X_SET_MHS, &control, 2);
797 }
798
799 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
800 {
801 if (on)
802 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
803 else
804 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
805 }
806
807 static int cp210x_tiocmget(struct tty_struct *tty)
808 {
809 struct usb_serial_port *port = tty->driver_data;
810 unsigned int control;
811 int result;
812
813 cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1);
814
815 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
816 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
817 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
818 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
819 |((control & CONTROL_RING)? TIOCM_RI : 0)
820 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
821
822 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
823
824 return result;
825 }
826
827 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
828 {
829 struct usb_serial_port *port = tty->driver_data;
830 unsigned int state;
831
832 if (break_state == 0)
833 state = BREAK_OFF;
834 else
835 state = BREAK_ON;
836 dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
837 state == BREAK_OFF ? "off" : "on");
838 cp210x_set_config(port, CP210X_SET_BREAK, &state, 2);
839 }
840
841 static int cp210x_startup(struct usb_serial *serial)
842 {
843 struct usb_host_interface *cur_altsetting;
844 struct cp210x_serial_private *spriv;
845
846 /* cp210x buffers behave strangely unless device is reset */
847 usb_reset_device(serial->dev);
848
849 spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
850 if (!spriv)
851 return -ENOMEM;
852
853 cur_altsetting = serial->interface->cur_altsetting;
854 spriv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber;
855
856 usb_set_serial_data(serial, spriv);
857
858 return 0;
859 }
860
861 static void cp210x_release(struct usb_serial *serial)
862 {
863 struct cp210x_serial_private *spriv;
864
865 spriv = usb_get_serial_data(serial);
866 kfree(spriv);
867 }
868
869 module_usb_serial_driver(serial_drivers, id_table);
870
871 MODULE_DESCRIPTION(DRIVER_DESC);
872 MODULE_LICENSE("GPL");
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