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NFS: Don't clear desc->pg_moreio in nfs_do_recoalesce()
[linux/fpc-iii.git] / drivers / usb / serial / cp210x.c
blobffd739e31bfc193b058628560e86ea6f9b96f375
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(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */
57 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
58 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
59 { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */
60 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
61 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
62 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
63 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
64 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
65 { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */
66 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
67 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
68 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
69 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
70 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
71 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
72 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
73 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
74 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
75 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
76 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
77 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
78 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
79 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
80 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
81 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
82 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
83 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
84 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
85 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
86 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
87 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
88 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
89 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
90 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
91 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
92 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
93 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
94 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
95 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
96 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
97 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
98 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
99 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
100 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
101 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
102 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
103 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
104 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
105 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
106 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
107 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
108 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */
109 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
110 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
111 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
112 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
113 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
114 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
115 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
116 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
117 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
118 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
119 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
120 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
121 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
122 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
123 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
124 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
125 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
126 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
127 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
128 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
129 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
130 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
131 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
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(0x16C0, 0x09B0) }, /* Lunatico Seletek */
153 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
154 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
155 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
156 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
157 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
158 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
159 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
160 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
161 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
162 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
163 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
164 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
165 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
166 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
167 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
168 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
169 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
170 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
171 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
172 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
173 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
174 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
175 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
176 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
177 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
178 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
179 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
180 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
181 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
182 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
183 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
184 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
185 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
186 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
187 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
188 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
189 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
190 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
191 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
192 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
193 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
194 { } /* Terminating Entry */
195 };
196
197 MODULE_DEVICE_TABLE(usb, id_table);
198
199 struct cp210x_serial_private {
200 __u8 bInterfaceNumber;
201 };
202
203 static struct usb_serial_driver cp210x_device = {
204 .driver = {
205 .owner = THIS_MODULE,
206 .name = "cp210x",
207 },
208 .id_table = id_table,
209 .num_ports = 1,
210 .bulk_in_size = 256,
211 .bulk_out_size = 256,
212 .open = cp210x_open,
213 .close = cp210x_close,
214 .break_ctl = cp210x_break_ctl,
215 .set_termios = cp210x_set_termios,
216 .tiocmget = cp210x_tiocmget,
217 .tiocmset = cp210x_tiocmset,
218 .attach = cp210x_startup,
219 .release = cp210x_release,
220 .dtr_rts = cp210x_dtr_rts
221 };
222
223 static struct usb_serial_driver * const serial_drivers[] = {
224 &cp210x_device, NULL
225 };
226
227 /* Config request types */
228 #define REQTYPE_HOST_TO_INTERFACE 0x41
229 #define REQTYPE_INTERFACE_TO_HOST 0xc1
230 #define REQTYPE_HOST_TO_DEVICE 0x40
231 #define REQTYPE_DEVICE_TO_HOST 0xc0
232
233 /* Config request codes */
234 #define CP210X_IFC_ENABLE 0x00
235 #define CP210X_SET_BAUDDIV 0x01
236 #define CP210X_GET_BAUDDIV 0x02
237 #define CP210X_SET_LINE_CTL 0x03
238 #define CP210X_GET_LINE_CTL 0x04
239 #define CP210X_SET_BREAK 0x05
240 #define CP210X_IMM_CHAR 0x06
241 #define CP210X_SET_MHS 0x07
242 #define CP210X_GET_MDMSTS 0x08
243 #define CP210X_SET_XON 0x09
244 #define CP210X_SET_XOFF 0x0A
245 #define CP210X_SET_EVENTMASK 0x0B
246 #define CP210X_GET_EVENTMASK 0x0C
247 #define CP210X_SET_CHAR 0x0D
248 #define CP210X_GET_CHARS 0x0E
249 #define CP210X_GET_PROPS 0x0F
250 #define CP210X_GET_COMM_STATUS 0x10
251 #define CP210X_RESET 0x11
252 #define CP210X_PURGE 0x12
253 #define CP210X_SET_FLOW 0x13
254 #define CP210X_GET_FLOW 0x14
255 #define CP210X_EMBED_EVENTS 0x15
256 #define CP210X_GET_EVENTSTATE 0x16
257 #define CP210X_SET_CHARS 0x19
258 #define CP210X_GET_BAUDRATE 0x1D
259 #define CP210X_SET_BAUDRATE 0x1E
260
261 /* CP210X_IFC_ENABLE */
262 #define UART_ENABLE 0x0001
263 #define UART_DISABLE 0x0000
264
265 /* CP210X_(SET|GET)_BAUDDIV */
266 #define BAUD_RATE_GEN_FREQ 0x384000
267
268 /* CP210X_(SET|GET)_LINE_CTL */
269 #define BITS_DATA_MASK 0X0f00
270 #define BITS_DATA_5 0X0500
271 #define BITS_DATA_6 0X0600
272 #define BITS_DATA_7 0X0700
273 #define BITS_DATA_8 0X0800
274 #define BITS_DATA_9 0X0900
275
276 #define BITS_PARITY_MASK 0x00f0
277 #define BITS_PARITY_NONE 0x0000
278 #define BITS_PARITY_ODD 0x0010
279 #define BITS_PARITY_EVEN 0x0020
280 #define BITS_PARITY_MARK 0x0030
281 #define BITS_PARITY_SPACE 0x0040
282
283 #define BITS_STOP_MASK 0x000f
284 #define BITS_STOP_1 0x0000
285 #define BITS_STOP_1_5 0x0001
286 #define BITS_STOP_2 0x0002
287
288 /* CP210X_SET_BREAK */
289 #define BREAK_ON 0x0001
290 #define BREAK_OFF 0x0000
291
292 /* CP210X_(SET_MHS|GET_MDMSTS) */
293 #define CONTROL_DTR 0x0001
294 #define CONTROL_RTS 0x0002
295 #define CONTROL_CTS 0x0010
296 #define CONTROL_DSR 0x0020
297 #define CONTROL_RING 0x0040
298 #define CONTROL_DCD 0x0080
299 #define CONTROL_WRITE_DTR 0x0100
300 #define CONTROL_WRITE_RTS 0x0200
301
302 /*
303 * cp210x_get_config
304 * Reads from the CP210x configuration registers
305 * 'size' is specified in bytes.
306 * 'data' is a pointer to a pre-allocated array of integers large
307 * enough to hold 'size' bytes (with 4 bytes to each integer)
308 */
309 static int cp210x_get_config(struct usb_serial_port *port, u8 request,
310 unsigned int *data, int size)
311 {
312 struct usb_serial *serial = port->serial;
313 struct cp210x_serial_private *spriv = usb_get_serial_data(serial);
314 __le32 *buf;
315 int result, i, length;
316
317 /* Number of integers required to contain the array */
318 length = (((size - 1) | 3) + 1) / 4;
319
320 buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
321 if (!buf)
322 return -ENOMEM;
323
324 /* Issue the request, attempting to read 'size' bytes */
325 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
326 request, REQTYPE_INTERFACE_TO_HOST, 0x0000,
327 spriv->bInterfaceNumber, buf, size,
328 USB_CTRL_GET_TIMEOUT);
329
330 /* Convert data into an array of integers */
331 for (i = 0; i < length; i++)
332 data[i] = le32_to_cpu(buf[i]);
333
334 kfree(buf);
335
336 if (result != size) {
337 dev_dbg(&port->dev, "%s - Unable to send config request, request=0x%x size=%d result=%d\n",
338 __func__, request, size, result);
339 if (result > 0)
340 result = -EPROTO;
341
342 return result;
343 }
344
345 return 0;
346 }
347
348 /*
349 * cp210x_set_config
350 * Writes to the CP210x configuration registers
351 * Values less than 16 bits wide are sent directly
352 * 'size' is specified in bytes.
353 */
354 static int cp210x_set_config(struct usb_serial_port *port, u8 request,
355 unsigned int *data, int size)
356 {
357 struct usb_serial *serial = port->serial;
358 struct cp210x_serial_private *spriv = usb_get_serial_data(serial);
359 __le32 *buf;
360 int result, i, length;
361
362 /* Number of integers required to contain the array */
363 length = (((size - 1) | 3) + 1) / 4;
364
365 buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
366 if (!buf)
367 return -ENOMEM;
368
369 /* Array of integers into bytes */
370 for (i = 0; i < length; i++)
371 buf[i] = cpu_to_le32(data[i]);
372
373 if (size > 2) {
374 result = usb_control_msg(serial->dev,
375 usb_sndctrlpipe(serial->dev, 0),
376 request, REQTYPE_HOST_TO_INTERFACE, 0x0000,
377 spriv->bInterfaceNumber, buf, size,
378 USB_CTRL_SET_TIMEOUT);
379 } else {
380 result = usb_control_msg(serial->dev,
381 usb_sndctrlpipe(serial->dev, 0),
382 request, REQTYPE_HOST_TO_INTERFACE, data[0],
383 spriv->bInterfaceNumber, NULL, 0,
384 USB_CTRL_SET_TIMEOUT);
385 }
386
387 kfree(buf);
388
389 if ((size > 2 && result != size) || result < 0) {
390 dev_dbg(&port->dev, "%s - Unable to send request, request=0x%x size=%d result=%d\n",
391 __func__, request, size, result);
392 if (result > 0)
393 result = -EPROTO;
394
395 return result;
396 }
397
398 return 0;
399 }
400
401 /*
402 * cp210x_set_config_single
403 * Convenience function for calling cp210x_set_config on single data values
404 * without requiring an integer pointer
405 */
406 static inline int cp210x_set_config_single(struct usb_serial_port *port,
407 u8 request, unsigned int data)
408 {
409 return cp210x_set_config(port, request, &data, 2);
410 }
411
412 /*
413 * cp210x_quantise_baudrate
414 * Quantises the baud rate as per AN205 Table 1
415 */
416 static unsigned int cp210x_quantise_baudrate(unsigned int baud)
417 {
418 if (baud <= 300)
419 baud = 300;
420 else if (baud <= 600) baud = 600;
421 else if (baud <= 1200) baud = 1200;
422 else if (baud <= 1800) baud = 1800;
423 else if (baud <= 2400) baud = 2400;
424 else if (baud <= 4000) baud = 4000;
425 else if (baud <= 4803) baud = 4800;
426 else if (baud <= 7207) baud = 7200;
427 else if (baud <= 9612) baud = 9600;
428 else if (baud <= 14428) baud = 14400;
429 else if (baud <= 16062) baud = 16000;
430 else if (baud <= 19250) baud = 19200;
431 else if (baud <= 28912) baud = 28800;
432 else if (baud <= 38601) baud = 38400;
433 else if (baud <= 51558) baud = 51200;
434 else if (baud <= 56280) baud = 56000;
435 else if (baud <= 58053) baud = 57600;
436 else if (baud <= 64111) baud = 64000;
437 else if (baud <= 77608) baud = 76800;
438 else if (baud <= 117028) baud = 115200;
439 else if (baud <= 129347) baud = 128000;
440 else if (baud <= 156868) baud = 153600;
441 else if (baud <= 237832) baud = 230400;
442 else if (baud <= 254234) baud = 250000;
443 else if (baud <= 273066) baud = 256000;
444 else if (baud <= 491520) baud = 460800;
445 else if (baud <= 567138) baud = 500000;
446 else if (baud <= 670254) baud = 576000;
447 else if (baud < 1000000)
448 baud = 921600;
449 else if (baud > 2000000)
450 baud = 2000000;
451 return baud;
452 }
453
454 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
455 {
456 int result;
457
458 result = cp210x_set_config_single(port, CP210X_IFC_ENABLE,
459 UART_ENABLE);
460 if (result) {
461 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
462 return result;
463 }
464
465 /* Configure the termios structure */
466 cp210x_get_termios(tty, port);
467
468 /* The baud rate must be initialised on cp2104 */
469 if (tty)
470 cp210x_change_speed(tty, port, NULL);
471
472 return usb_serial_generic_open(tty, port);
473 }
474
475 static void cp210x_close(struct usb_serial_port *port)
476 {
477 usb_serial_generic_close(port);
478 cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE);
479 }
480
481 /*
482 * cp210x_get_termios
483 * Reads the baud rate, data bits, parity, stop bits and flow control mode
484 * from the device, corrects any unsupported values, and configures the
485 * termios structure to reflect the state of the device
486 */
487 static void cp210x_get_termios(struct tty_struct *tty,
488 struct usb_serial_port *port)
489 {
490 unsigned int baud;
491
492 if (tty) {
493 cp210x_get_termios_port(tty->driver_data,
494 &tty->termios.c_cflag, &baud);
495 tty_encode_baud_rate(tty, baud, baud);
496 } else {
497 unsigned int cflag;
498 cflag = 0;
499 cp210x_get_termios_port(port, &cflag, &baud);
500 }
501 }
502
503 /*
504 * cp210x_get_termios_port
505 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
506 */
507 static void cp210x_get_termios_port(struct usb_serial_port *port,
508 unsigned int *cflagp, unsigned int *baudp)
509 {
510 struct device *dev = &port->dev;
511 unsigned int cflag, modem_ctl[4];
512 unsigned int baud;
513 unsigned int bits;
514
515 cp210x_get_config(port, CP210X_GET_BAUDRATE, &baud, 4);
516
517 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
518 *baudp = baud;
519
520 cflag = *cflagp;
521
522 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
523 cflag &= ~CSIZE;
524 switch (bits & BITS_DATA_MASK) {
525 case BITS_DATA_5:
526 dev_dbg(dev, "%s - data bits = 5\n", __func__);
527 cflag |= CS5;
528 break;
529 case BITS_DATA_6:
530 dev_dbg(dev, "%s - data bits = 6\n", __func__);
531 cflag |= CS6;
532 break;
533 case BITS_DATA_7:
534 dev_dbg(dev, "%s - data bits = 7\n", __func__);
535 cflag |= CS7;
536 break;
537 case BITS_DATA_8:
538 dev_dbg(dev, "%s - data bits = 8\n", __func__);
539 cflag |= CS8;
540 break;
541 case BITS_DATA_9:
542 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
543 cflag |= CS8;
544 bits &= ~BITS_DATA_MASK;
545 bits |= BITS_DATA_8;
546 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
547 break;
548 default:
549 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
550 cflag |= CS8;
551 bits &= ~BITS_DATA_MASK;
552 bits |= BITS_DATA_8;
553 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
554 break;
555 }
556
557 switch (bits & BITS_PARITY_MASK) {
558 case BITS_PARITY_NONE:
559 dev_dbg(dev, "%s - parity = NONE\n", __func__);
560 cflag &= ~PARENB;
561 break;
562 case BITS_PARITY_ODD:
563 dev_dbg(dev, "%s - parity = ODD\n", __func__);
564 cflag |= (PARENB|PARODD);
565 break;
566 case BITS_PARITY_EVEN:
567 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
568 cflag &= ~PARODD;
569 cflag |= PARENB;
570 break;
571 case BITS_PARITY_MARK:
572 dev_dbg(dev, "%s - parity = MARK\n", __func__);
573 cflag |= (PARENB|PARODD|CMSPAR);
574 break;
575 case BITS_PARITY_SPACE:
576 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
577 cflag &= ~PARODD;
578 cflag |= (PARENB|CMSPAR);
579 break;
580 default:
581 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
582 cflag &= ~PARENB;
583 bits &= ~BITS_PARITY_MASK;
584 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
585 break;
586 }
587
588 cflag &= ~CSTOPB;
589 switch (bits & BITS_STOP_MASK) {
590 case BITS_STOP_1:
591 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
592 break;
593 case BITS_STOP_1_5:
594 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
595 bits &= ~BITS_STOP_MASK;
596 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
597 break;
598 case BITS_STOP_2:
599 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
600 cflag |= CSTOPB;
601 break;
602 default:
603 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
604 bits &= ~BITS_STOP_MASK;
605 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
606 break;
607 }
608
609 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
610 if (modem_ctl[0] & 0x0008) {
611 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
612 cflag |= CRTSCTS;
613 } else {
614 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
615 cflag &= ~CRTSCTS;
616 }
617
618 *cflagp = cflag;
619 }
620
621 /*
622 * CP2101 supports the following baud rates:
623 *
624 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
625 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
626 *
627 * CP2102 and CP2103 support the following additional rates:
628 *
629 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
630 * 576000
631 *
632 * The device will map a requested rate to a supported one, but the result
633 * of requests for rates greater than 1053257 is undefined (see AN205).
634 *
635 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
636 * respectively, with an error less than 1%. The actual rates are determined
637 * by
638 *
639 * div = round(freq / (2 x prescale x request))
640 * actual = freq / (2 x prescale x div)
641 *
642 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
643 * or 1 otherwise.
644 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
645 * otherwise.
646 */
647 static void cp210x_change_speed(struct tty_struct *tty,
648 struct usb_serial_port *port, struct ktermios *old_termios)
649 {
650 u32 baud;
651
652 baud = tty->termios.c_ospeed;
653
654 /* This maps the requested rate to a rate valid on cp2102 or cp2103,
655 * or to an arbitrary rate in [1M,2M].
656 *
657 * NOTE: B0 is not implemented.
658 */
659 baud = cp210x_quantise_baudrate(baud);
660
661 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
662 if (cp210x_set_config(port, CP210X_SET_BAUDRATE, &baud,
663 sizeof(baud))) {
664 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
665 if (old_termios)
666 baud = old_termios->c_ospeed;
667 else
668 baud = 9600;
669 }
670
671 tty_encode_baud_rate(tty, baud, baud);
672 }
673
674 static void cp210x_set_termios(struct tty_struct *tty,
675 struct usb_serial_port *port, struct ktermios *old_termios)
676 {
677 struct device *dev = &port->dev;
678 unsigned int cflag, old_cflag;
679 unsigned int bits;
680 unsigned int modem_ctl[4];
681
682 cflag = tty->termios.c_cflag;
683 old_cflag = old_termios->c_cflag;
684
685 if (tty->termios.c_ospeed != old_termios->c_ospeed)
686 cp210x_change_speed(tty, port, old_termios);
687
688 /* If the number of data bits is to be updated */
689 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
690 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
691 bits &= ~BITS_DATA_MASK;
692 switch (cflag & CSIZE) {
693 case CS5:
694 bits |= BITS_DATA_5;
695 dev_dbg(dev, "%s - data bits = 5\n", __func__);
696 break;
697 case CS6:
698 bits |= BITS_DATA_6;
699 dev_dbg(dev, "%s - data bits = 6\n", __func__);
700 break;
701 case CS7:
702 bits |= BITS_DATA_7;
703 dev_dbg(dev, "%s - data bits = 7\n", __func__);
704 break;
705 case CS8:
706 bits |= BITS_DATA_8;
707 dev_dbg(dev, "%s - data bits = 8\n", __func__);
708 break;
709 /*case CS9:
710 bits |= BITS_DATA_9;
711 dev_dbg(dev, "%s - data bits = 9\n", __func__);
712 break;*/
713 default:
714 dev_dbg(dev, "cp210x driver does not support the number of bits requested, using 8 bit mode\n");
715 bits |= BITS_DATA_8;
716 break;
717 }
718 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
719 dev_dbg(dev, "Number of data bits requested not supported by device\n");
720 }
721
722 if ((cflag & (PARENB|PARODD|CMSPAR)) !=
723 (old_cflag & (PARENB|PARODD|CMSPAR))) {
724 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
725 bits &= ~BITS_PARITY_MASK;
726 if (cflag & PARENB) {
727 if (cflag & CMSPAR) {
728 if (cflag & PARODD) {
729 bits |= BITS_PARITY_MARK;
730 dev_dbg(dev, "%s - parity = MARK\n", __func__);
731 } else {
732 bits |= BITS_PARITY_SPACE;
733 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
734 }
735 } else {
736 if (cflag & PARODD) {
737 bits |= BITS_PARITY_ODD;
738 dev_dbg(dev, "%s - parity = ODD\n", __func__);
739 } else {
740 bits |= BITS_PARITY_EVEN;
741 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
742 }
743 }
744 }
745 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
746 dev_dbg(dev, "Parity mode not supported by device\n");
747 }
748
749 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
750 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
751 bits &= ~BITS_STOP_MASK;
752 if (cflag & CSTOPB) {
753 bits |= BITS_STOP_2;
754 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
755 } else {
756 bits |= BITS_STOP_1;
757 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
758 }
759 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
760 dev_dbg(dev, "Number of stop bits requested not supported by device\n");
761 }
762
763 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
764 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
765 dev_dbg(dev, "%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n",
766 __func__, modem_ctl[0], modem_ctl[1],
767 modem_ctl[2], modem_ctl[3]);
768
769 if (cflag & CRTSCTS) {
770 modem_ctl[0] &= ~0x7B;
771 modem_ctl[0] |= 0x09;
772 modem_ctl[1] = 0x80;
773 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
774 } else {
775 modem_ctl[0] &= ~0x7B;
776 modem_ctl[0] |= 0x01;
777 modem_ctl[1] |= 0x40;
778 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
779 }
780
781 dev_dbg(dev, "%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n",
782 __func__, modem_ctl[0], modem_ctl[1],
783 modem_ctl[2], modem_ctl[3]);
784 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16);
785 }
786
787 }
788
789 static int cp210x_tiocmset(struct tty_struct *tty,
790 unsigned int set, unsigned int clear)
791 {
792 struct usb_serial_port *port = tty->driver_data;
793 return cp210x_tiocmset_port(port, set, clear);
794 }
795
796 static int cp210x_tiocmset_port(struct usb_serial_port *port,
797 unsigned int set, unsigned int clear)
798 {
799 unsigned int control = 0;
800
801 if (set & TIOCM_RTS) {
802 control |= CONTROL_RTS;
803 control |= CONTROL_WRITE_RTS;
804 }
805 if (set & TIOCM_DTR) {
806 control |= CONTROL_DTR;
807 control |= CONTROL_WRITE_DTR;
808 }
809 if (clear & TIOCM_RTS) {
810 control &= ~CONTROL_RTS;
811 control |= CONTROL_WRITE_RTS;
812 }
813 if (clear & TIOCM_DTR) {
814 control &= ~CONTROL_DTR;
815 control |= CONTROL_WRITE_DTR;
816 }
817
818 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
819
820 return cp210x_set_config(port, CP210X_SET_MHS, &control, 2);
821 }
822
823 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
824 {
825 if (on)
826 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
827 else
828 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
829 }
830
831 static int cp210x_tiocmget(struct tty_struct *tty)
832 {
833 struct usb_serial_port *port = tty->driver_data;
834 unsigned int control;
835 int result;
836
837 cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1);
838
839 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
840 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
841 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
842 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
843 |((control & CONTROL_RING)? TIOCM_RI : 0)
844 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
845
846 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
847
848 return result;
849 }
850
851 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
852 {
853 struct usb_serial_port *port = tty->driver_data;
854 unsigned int state;
855
856 if (break_state == 0)
857 state = BREAK_OFF;
858 else
859 state = BREAK_ON;
860 dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
861 state == BREAK_OFF ? "off" : "on");
862 cp210x_set_config(port, CP210X_SET_BREAK, &state, 2);
863 }
864
865 static int cp210x_startup(struct usb_serial *serial)
866 {
867 struct usb_host_interface *cur_altsetting;
868 struct cp210x_serial_private *spriv;
869
870 spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
871 if (!spriv)
872 return -ENOMEM;
873
874 cur_altsetting = serial->interface->cur_altsetting;
875 spriv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber;
876
877 usb_set_serial_data(serial, spriv);
878
879 return 0;
880 }
881
882 static void cp210x_release(struct usb_serial *serial)
883 {
884 struct cp210x_serial_private *spriv;
885
886 spriv = usb_get_serial_data(serial);
887 kfree(spriv);
888 }
889
890 module_usb_serial_driver(serial_drivers, id_table);
891
892 MODULE_DESCRIPTION(DRIVER_DESC);
893 MODULE_LICENSE("GPL");
Linux with added FPC-III support