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[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 bool cp210x_tx_empty(struct usb_serial_port *port);
42 static int cp210x_tiocmget(struct tty_struct *);
43 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
44 static int cp210x_tiocmset_port(struct usb_serial_port *port,
45 unsigned int, unsigned int);
46 static void cp210x_break_ctl(struct tty_struct *, int);
47 static int cp210x_port_probe(struct usb_serial_port *);
48 static int cp210x_port_remove(struct usb_serial_port *);
49 static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
50
51 static const struct usb_device_id id_table[] = {
52 { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */
53 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
54 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
55 { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
56 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
57 { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */
58 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
59 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
60 { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */
61 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
62 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
63 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
64 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
65 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
66 { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */
67 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
68 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
69 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
70 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
71 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
72 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
73 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
74 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
75 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
76 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
77 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
78 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
79 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
80 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
81 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
82 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
83 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
84 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
85 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
86 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
87 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
88 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
89 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
90 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
91 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
92 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
93 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
94 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
95 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
96 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
97 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
98 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
99 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
100 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
101 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
102 { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */
103 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
104 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
105 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
106 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
107 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
108 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
109 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
110 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */
111 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
112 { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */
113 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
114 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
115 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
116 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
117 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
118 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
119 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
120 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
121 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
122 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
123 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
124 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
125 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
126 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
127 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
128 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
129 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
130 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
131 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
132 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
133 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
134 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
135 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
136 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
137 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
138 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
139 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
140 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
141 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
142 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
143 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
144 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
145 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
146 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
147 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
148 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
149 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
150 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
151 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
152 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
153 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
154 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
155 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
156 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
157 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
158 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
159 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
160 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
161 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
162 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
163 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
164 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
165 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
166 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
167 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
168 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
169 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
170 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
171 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
172 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
173 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
174 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
175 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
176 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
177 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
178 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
179 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
180 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
181 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
182 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
183 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
184 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
185 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
186 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
187 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
188 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
189 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
190 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
191 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
192 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
193 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
194 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
195 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
196 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
197 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
198 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
199 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
200 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
201 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
202 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
203 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
204 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
205 { } /* Terminating Entry */
206 };
207
208 MODULE_DEVICE_TABLE(usb, id_table);
209
210 struct cp210x_port_private {
211 __u8 bInterfaceNumber;
212 bool has_swapped_line_ctl;
213 };
214
215 static struct usb_serial_driver cp210x_device = {
216 .driver = {
217 .owner = THIS_MODULE,
218 .name = "cp210x",
219 },
220 .id_table = id_table,
221 .num_ports = 1,
222 .bulk_in_size = 256,
223 .bulk_out_size = 256,
224 .open = cp210x_open,
225 .close = cp210x_close,
226 .break_ctl = cp210x_break_ctl,
227 .set_termios = cp210x_set_termios,
228 .tx_empty = cp210x_tx_empty,
229 .tiocmget = cp210x_tiocmget,
230 .tiocmset = cp210x_tiocmset,
231 .port_probe = cp210x_port_probe,
232 .port_remove = cp210x_port_remove,
233 .dtr_rts = cp210x_dtr_rts
234 };
235
236 static struct usb_serial_driver * const serial_drivers[] = {
237 &cp210x_device, NULL
238 };
239
240 /* Config request types */
241 #define REQTYPE_HOST_TO_INTERFACE 0x41
242 #define REQTYPE_INTERFACE_TO_HOST 0xc1
243 #define REQTYPE_HOST_TO_DEVICE 0x40
244 #define REQTYPE_DEVICE_TO_HOST 0xc0
245
246 /* Config request codes */
247 #define CP210X_IFC_ENABLE 0x00
248 #define CP210X_SET_BAUDDIV 0x01
249 #define CP210X_GET_BAUDDIV 0x02
250 #define CP210X_SET_LINE_CTL 0x03
251 #define CP210X_GET_LINE_CTL 0x04
252 #define CP210X_SET_BREAK 0x05
253 #define CP210X_IMM_CHAR 0x06
254 #define CP210X_SET_MHS 0x07
255 #define CP210X_GET_MDMSTS 0x08
256 #define CP210X_SET_XON 0x09
257 #define CP210X_SET_XOFF 0x0A
258 #define CP210X_SET_EVENTMASK 0x0B
259 #define CP210X_GET_EVENTMASK 0x0C
260 #define CP210X_SET_CHAR 0x0D
261 #define CP210X_GET_CHARS 0x0E
262 #define CP210X_GET_PROPS 0x0F
263 #define CP210X_GET_COMM_STATUS 0x10
264 #define CP210X_RESET 0x11
265 #define CP210X_PURGE 0x12
266 #define CP210X_SET_FLOW 0x13
267 #define CP210X_GET_FLOW 0x14
268 #define CP210X_EMBED_EVENTS 0x15
269 #define CP210X_GET_EVENTSTATE 0x16
270 #define CP210X_SET_CHARS 0x19
271 #define CP210X_GET_BAUDRATE 0x1D
272 #define CP210X_SET_BAUDRATE 0x1E
273
274 /* CP210X_IFC_ENABLE */
275 #define UART_ENABLE 0x0001
276 #define UART_DISABLE 0x0000
277
278 /* CP210X_(SET|GET)_BAUDDIV */
279 #define BAUD_RATE_GEN_FREQ 0x384000
280
281 /* CP210X_(SET|GET)_LINE_CTL */
282 #define BITS_DATA_MASK 0X0f00
283 #define BITS_DATA_5 0X0500
284 #define BITS_DATA_6 0X0600
285 #define BITS_DATA_7 0X0700
286 #define BITS_DATA_8 0X0800
287 #define BITS_DATA_9 0X0900
288
289 #define BITS_PARITY_MASK 0x00f0
290 #define BITS_PARITY_NONE 0x0000
291 #define BITS_PARITY_ODD 0x0010
292 #define BITS_PARITY_EVEN 0x0020
293 #define BITS_PARITY_MARK 0x0030
294 #define BITS_PARITY_SPACE 0x0040
295
296 #define BITS_STOP_MASK 0x000f
297 #define BITS_STOP_1 0x0000
298 #define BITS_STOP_1_5 0x0001
299 #define BITS_STOP_2 0x0002
300
301 /* CP210X_SET_BREAK */
302 #define BREAK_ON 0x0001
303 #define BREAK_OFF 0x0000
304
305 /* CP210X_(SET_MHS|GET_MDMSTS) */
306 #define CONTROL_DTR 0x0001
307 #define CONTROL_RTS 0x0002
308 #define CONTROL_CTS 0x0010
309 #define CONTROL_DSR 0x0020
310 #define CONTROL_RING 0x0040
311 #define CONTROL_DCD 0x0080
312 #define CONTROL_WRITE_DTR 0x0100
313 #define CONTROL_WRITE_RTS 0x0200
314
315 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
316 struct cp210x_comm_status {
317 __le32 ulErrors;
318 __le32 ulHoldReasons;
319 __le32 ulAmountInInQueue;
320 __le32 ulAmountInOutQueue;
321 u8 bEofReceived;
322 u8 bWaitForImmediate;
323 u8 bReserved;
324 } __packed;
325
326 /*
327 * CP210X_PURGE - 16 bits passed in wValue of USB request.
328 * SiLabs app note AN571 gives a strange description of the 4 bits:
329 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
330 * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
331 */
332 #define PURGE_ALL 0x000f
333
334 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
335 struct cp210x_flow_ctl {
336 __le32 ulControlHandshake;
337 __le32 ulFlowReplace;
338 __le32 ulXonLimit;
339 __le32 ulXoffLimit;
340 } __packed;
341
342 /* cp210x_flow_ctl::ulControlHandshake */
343 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0)
344 #define CP210X_SERIAL_DTR_SHIFT(_mode) (_mode)
345 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3)
346 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4)
347 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5)
348 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6)
349
350 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */
351 #define CP210X_SERIAL_DTR_INACTIVE 0
352 #define CP210X_SERIAL_DTR_ACTIVE 1
353 #define CP210X_SERIAL_DTR_FLOW_CTL 2
354
355 /* cp210x_flow_ctl::ulFlowReplace */
356 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0)
357 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1)
358 #define CP210X_SERIAL_ERROR_CHAR BIT(2)
359 #define CP210X_SERIAL_NULL_STRIPPING BIT(3)
360 #define CP210X_SERIAL_BREAK_CHAR BIT(4)
361 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6)
362 #define CP210X_SERIAL_RTS_SHIFT(_mode) (_mode << 6)
363 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31)
364
365 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */
366 #define CP210X_SERIAL_RTS_INACTIVE 0
367 #define CP210X_SERIAL_RTS_ACTIVE 1
368 #define CP210X_SERIAL_RTS_FLOW_CTL 2
369
370 /*
371 * Reads a variable-sized block of CP210X_ registers, identified by req.
372 * Returns data into buf in native USB byte order.
373 */
374 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
375 void *buf, int bufsize)
376 {
377 struct usb_serial *serial = port->serial;
378 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
379 void *dmabuf;
380 int result;
381
382 dmabuf = kmalloc(bufsize, GFP_KERNEL);
383 if (!dmabuf) {
384 /*
385 * FIXME Some callers don't bother to check for error,
386 * at least give them consistent junk until they are fixed
387 */
388 memset(buf, 0, bufsize);
389 return -ENOMEM;
390 }
391
392 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
393 req, REQTYPE_INTERFACE_TO_HOST, 0,
394 port_priv->bInterfaceNumber, dmabuf, bufsize,
395 USB_CTRL_SET_TIMEOUT);
396 if (result == bufsize) {
397 memcpy(buf, dmabuf, bufsize);
398 result = 0;
399 } else {
400 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
401 req, bufsize, result);
402 if (result >= 0)
403 result = -EPROTO;
404
405 /*
406 * FIXME Some callers don't bother to check for error,
407 * at least give them consistent junk until they are fixed
408 */
409 memset(buf, 0, bufsize);
410 }
411
412 kfree(dmabuf);
413
414 return result;
415 }
416
417 /*
418 * Reads any 32-bit CP210X_ register identified by req.
419 */
420 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val)
421 {
422 __le32 le32_val;
423 int err;
424
425 err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val));
426 if (err) {
427 /*
428 * FIXME Some callers don't bother to check for error,
429 * at least give them consistent junk until they are fixed
430 */
431 *val = 0;
432 return err;
433 }
434
435 *val = le32_to_cpu(le32_val);
436
437 return 0;
438 }
439
440 /*
441 * Reads any 16-bit CP210X_ register identified by req.
442 */
443 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val)
444 {
445 __le16 le16_val;
446 int err;
447
448 err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val));
449 if (err)
450 return err;
451
452 *val = le16_to_cpu(le16_val);
453
454 return 0;
455 }
456
457 /*
458 * Reads any 8-bit CP210X_ register identified by req.
459 */
460 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
461 {
462 return cp210x_read_reg_block(port, req, val, sizeof(*val));
463 }
464
465 /*
466 * Writes any 16-bit CP210X_ register (req) whose value is passed
467 * entirely in the wValue field of the USB request.
468 */
469 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
470 {
471 struct usb_serial *serial = port->serial;
472 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
473 int result;
474
475 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
476 req, REQTYPE_HOST_TO_INTERFACE, val,
477 port_priv->bInterfaceNumber, NULL, 0,
478 USB_CTRL_SET_TIMEOUT);
479 if (result < 0) {
480 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
481 req, result);
482 }
483
484 return result;
485 }
486
487 /*
488 * Writes a variable-sized block of CP210X_ registers, identified by req.
489 * Data in buf must be in native USB byte order.
490 */
491 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
492 void *buf, int bufsize)
493 {
494 struct usb_serial *serial = port->serial;
495 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
496 void *dmabuf;
497 int result;
498
499 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
500 if (!dmabuf)
501 return -ENOMEM;
502
503 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
504 req, REQTYPE_HOST_TO_INTERFACE, 0,
505 port_priv->bInterfaceNumber, dmabuf, bufsize,
506 USB_CTRL_SET_TIMEOUT);
507
508 kfree(dmabuf);
509
510 if (result == bufsize) {
511 result = 0;
512 } else {
513 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
514 req, bufsize, result);
515 if (result >= 0)
516 result = -EPROTO;
517 }
518
519 return result;
520 }
521
522 /*
523 * Writes any 32-bit CP210X_ register identified by req.
524 */
525 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
526 {
527 __le32 le32_val;
528
529 le32_val = cpu_to_le32(val);
530
531 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
532 }
533
534 /*
535 * Detect CP2108 GET_LINE_CTL bug and activate workaround.
536 * Write a known good value 0x800, read it back.
537 * If it comes back swapped the bug is detected.
538 * Preserve the original register value.
539 */
540 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
541 {
542 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
543 u16 line_ctl_save;
544 u16 line_ctl_test;
545 int err;
546
547 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save);
548 if (err)
549 return err;
550
551 err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800);
552 if (err)
553 return err;
554
555 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test);
556 if (err)
557 return err;
558
559 if (line_ctl_test == 8) {
560 port_priv->has_swapped_line_ctl = true;
561 line_ctl_save = swab16(line_ctl_save);
562 }
563
564 return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save);
565 }
566
567 /*
568 * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL)
569 * to workaround cp2108 bug and get correct value.
570 */
571 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl)
572 {
573 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
574 int err;
575
576 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl);
577 if (err)
578 return err;
579
580 /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
581 if (port_priv->has_swapped_line_ctl)
582 *ctl = swab16(*ctl);
583
584 return 0;
585 }
586
587 /*
588 * cp210x_quantise_baudrate
589 * Quantises the baud rate as per AN205 Table 1
590 */
591 static unsigned int cp210x_quantise_baudrate(unsigned int baud)
592 {
593 if (baud <= 300)
594 baud = 300;
595 else if (baud <= 600) baud = 600;
596 else if (baud <= 1200) baud = 1200;
597 else if (baud <= 1800) baud = 1800;
598 else if (baud <= 2400) baud = 2400;
599 else if (baud <= 4000) baud = 4000;
600 else if (baud <= 4803) baud = 4800;
601 else if (baud <= 7207) baud = 7200;
602 else if (baud <= 9612) baud = 9600;
603 else if (baud <= 14428) baud = 14400;
604 else if (baud <= 16062) baud = 16000;
605 else if (baud <= 19250) baud = 19200;
606 else if (baud <= 28912) baud = 28800;
607 else if (baud <= 38601) baud = 38400;
608 else if (baud <= 51558) baud = 51200;
609 else if (baud <= 56280) baud = 56000;
610 else if (baud <= 58053) baud = 57600;
611 else if (baud <= 64111) baud = 64000;
612 else if (baud <= 77608) baud = 76800;
613 else if (baud <= 117028) baud = 115200;
614 else if (baud <= 129347) baud = 128000;
615 else if (baud <= 156868) baud = 153600;
616 else if (baud <= 237832) baud = 230400;
617 else if (baud <= 254234) baud = 250000;
618 else if (baud <= 273066) baud = 256000;
619 else if (baud <= 491520) baud = 460800;
620 else if (baud <= 567138) baud = 500000;
621 else if (baud <= 670254) baud = 576000;
622 else if (baud < 1000000)
623 baud = 921600;
624 else if (baud > 2000000)
625 baud = 2000000;
626 return baud;
627 }
628
629 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
630 {
631 int result;
632
633 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
634 if (result) {
635 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
636 return result;
637 }
638
639 /* Configure the termios structure */
640 cp210x_get_termios(tty, port);
641
642 /* The baud rate must be initialised on cp2104 */
643 if (tty)
644 cp210x_change_speed(tty, port, NULL);
645
646 return usb_serial_generic_open(tty, port);
647 }
648
649 static void cp210x_close(struct usb_serial_port *port)
650 {
651 usb_serial_generic_close(port);
652
653 /* Clear both queues; cp2108 needs this to avoid an occasional hang */
654 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
655
656 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
657 }
658
659 /*
660 * Read how many bytes are waiting in the TX queue.
661 */
662 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
663 u32 *count)
664 {
665 struct usb_serial *serial = port->serial;
666 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
667 struct cp210x_comm_status *sts;
668 int result;
669
670 sts = kmalloc(sizeof(*sts), GFP_KERNEL);
671 if (!sts)
672 return -ENOMEM;
673
674 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
675 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
676 0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
677 USB_CTRL_GET_TIMEOUT);
678 if (result == sizeof(*sts)) {
679 *count = le32_to_cpu(sts->ulAmountInOutQueue);
680 result = 0;
681 } else {
682 dev_err(&port->dev, "failed to get comm status: %d\n", result);
683 if (result >= 0)
684 result = -EPROTO;
685 }
686
687 kfree(sts);
688
689 return result;
690 }
691
692 static bool cp210x_tx_empty(struct usb_serial_port *port)
693 {
694 int err;
695 u32 count;
696
697 err = cp210x_get_tx_queue_byte_count(port, &count);
698 if (err)
699 return true;
700
701 return !count;
702 }
703
704 /*
705 * cp210x_get_termios
706 * Reads the baud rate, data bits, parity, stop bits and flow control mode
707 * from the device, corrects any unsupported values, and configures the
708 * termios structure to reflect the state of the device
709 */
710 static void cp210x_get_termios(struct tty_struct *tty,
711 struct usb_serial_port *port)
712 {
713 unsigned int baud;
714
715 if (tty) {
716 cp210x_get_termios_port(tty->driver_data,
717 &tty->termios.c_cflag, &baud);
718 tty_encode_baud_rate(tty, baud, baud);
719 } else {
720 unsigned int cflag;
721 cflag = 0;
722 cp210x_get_termios_port(port, &cflag, &baud);
723 }
724 }
725
726 /*
727 * cp210x_get_termios_port
728 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
729 */
730 static void cp210x_get_termios_port(struct usb_serial_port *port,
731 unsigned int *cflagp, unsigned int *baudp)
732 {
733 struct device *dev = &port->dev;
734 unsigned int cflag;
735 struct cp210x_flow_ctl flow_ctl;
736 u32 baud;
737 u16 bits;
738 u32 ctl_hs;
739
740 cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud);
741
742 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
743 *baudp = baud;
744
745 cflag = *cflagp;
746
747 cp210x_get_line_ctl(port, &bits);
748 cflag &= ~CSIZE;
749 switch (bits & BITS_DATA_MASK) {
750 case BITS_DATA_5:
751 dev_dbg(dev, "%s - data bits = 5\n", __func__);
752 cflag |= CS5;
753 break;
754 case BITS_DATA_6:
755 dev_dbg(dev, "%s - data bits = 6\n", __func__);
756 cflag |= CS6;
757 break;
758 case BITS_DATA_7:
759 dev_dbg(dev, "%s - data bits = 7\n", __func__);
760 cflag |= CS7;
761 break;
762 case BITS_DATA_8:
763 dev_dbg(dev, "%s - data bits = 8\n", __func__);
764 cflag |= CS8;
765 break;
766 case BITS_DATA_9:
767 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
768 cflag |= CS8;
769 bits &= ~BITS_DATA_MASK;
770 bits |= BITS_DATA_8;
771 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
772 break;
773 default:
774 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
775 cflag |= CS8;
776 bits &= ~BITS_DATA_MASK;
777 bits |= BITS_DATA_8;
778 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
779 break;
780 }
781
782 switch (bits & BITS_PARITY_MASK) {
783 case BITS_PARITY_NONE:
784 dev_dbg(dev, "%s - parity = NONE\n", __func__);
785 cflag &= ~PARENB;
786 break;
787 case BITS_PARITY_ODD:
788 dev_dbg(dev, "%s - parity = ODD\n", __func__);
789 cflag |= (PARENB|PARODD);
790 break;
791 case BITS_PARITY_EVEN:
792 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
793 cflag &= ~PARODD;
794 cflag |= PARENB;
795 break;
796 case BITS_PARITY_MARK:
797 dev_dbg(dev, "%s - parity = MARK\n", __func__);
798 cflag |= (PARENB|PARODD|CMSPAR);
799 break;
800 case BITS_PARITY_SPACE:
801 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
802 cflag &= ~PARODD;
803 cflag |= (PARENB|CMSPAR);
804 break;
805 default:
806 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
807 cflag &= ~PARENB;
808 bits &= ~BITS_PARITY_MASK;
809 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
810 break;
811 }
812
813 cflag &= ~CSTOPB;
814 switch (bits & BITS_STOP_MASK) {
815 case BITS_STOP_1:
816 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
817 break;
818 case BITS_STOP_1_5:
819 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
820 bits &= ~BITS_STOP_MASK;
821 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
822 break;
823 case BITS_STOP_2:
824 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
825 cflag |= CSTOPB;
826 break;
827 default:
828 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
829 bits &= ~BITS_STOP_MASK;
830 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
831 break;
832 }
833
834 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
835 sizeof(flow_ctl));
836 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
837 if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) {
838 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
839 cflag |= CRTSCTS;
840 } else {
841 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
842 cflag &= ~CRTSCTS;
843 }
844
845 *cflagp = cflag;
846 }
847
848 /*
849 * CP2101 supports the following baud rates:
850 *
851 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
852 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
853 *
854 * CP2102 and CP2103 support the following additional rates:
855 *
856 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
857 * 576000
858 *
859 * The device will map a requested rate to a supported one, but the result
860 * of requests for rates greater than 1053257 is undefined (see AN205).
861 *
862 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
863 * respectively, with an error less than 1%. The actual rates are determined
864 * by
865 *
866 * div = round(freq / (2 x prescale x request))
867 * actual = freq / (2 x prescale x div)
868 *
869 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
870 * or 1 otherwise.
871 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
872 * otherwise.
873 */
874 static void cp210x_change_speed(struct tty_struct *tty,
875 struct usb_serial_port *port, struct ktermios *old_termios)
876 {
877 u32 baud;
878
879 baud = tty->termios.c_ospeed;
880
881 /* This maps the requested rate to a rate valid on cp2102 or cp2103,
882 * or to an arbitrary rate in [1M,2M].
883 *
884 * NOTE: B0 is not implemented.
885 */
886 baud = cp210x_quantise_baudrate(baud);
887
888 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
889 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
890 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
891 if (old_termios)
892 baud = old_termios->c_ospeed;
893 else
894 baud = 9600;
895 }
896
897 tty_encode_baud_rate(tty, baud, baud);
898 }
899
900 static void cp210x_set_termios(struct tty_struct *tty,
901 struct usb_serial_port *port, struct ktermios *old_termios)
902 {
903 struct device *dev = &port->dev;
904 unsigned int cflag, old_cflag;
905 u16 bits;
906
907 cflag = tty->termios.c_cflag;
908 old_cflag = old_termios->c_cflag;
909
910 if (tty->termios.c_ospeed != old_termios->c_ospeed)
911 cp210x_change_speed(tty, port, old_termios);
912
913 /* If the number of data bits is to be updated */
914 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
915 cp210x_get_line_ctl(port, &bits);
916 bits &= ~BITS_DATA_MASK;
917 switch (cflag & CSIZE) {
918 case CS5:
919 bits |= BITS_DATA_5;
920 dev_dbg(dev, "%s - data bits = 5\n", __func__);
921 break;
922 case CS6:
923 bits |= BITS_DATA_6;
924 dev_dbg(dev, "%s - data bits = 6\n", __func__);
925 break;
926 case CS7:
927 bits |= BITS_DATA_7;
928 dev_dbg(dev, "%s - data bits = 7\n", __func__);
929 break;
930 case CS8:
931 bits |= BITS_DATA_8;
932 dev_dbg(dev, "%s - data bits = 8\n", __func__);
933 break;
934 /*case CS9:
935 bits |= BITS_DATA_9;
936 dev_dbg(dev, "%s - data bits = 9\n", __func__);
937 break;*/
938 default:
939 dev_dbg(dev, "cp210x driver does not support the number of bits requested, using 8 bit mode\n");
940 bits |= BITS_DATA_8;
941 break;
942 }
943 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
944 dev_dbg(dev, "Number of data bits requested not supported by device\n");
945 }
946
947 if ((cflag & (PARENB|PARODD|CMSPAR)) !=
948 (old_cflag & (PARENB|PARODD|CMSPAR))) {
949 cp210x_get_line_ctl(port, &bits);
950 bits &= ~BITS_PARITY_MASK;
951 if (cflag & PARENB) {
952 if (cflag & CMSPAR) {
953 if (cflag & PARODD) {
954 bits |= BITS_PARITY_MARK;
955 dev_dbg(dev, "%s - parity = MARK\n", __func__);
956 } else {
957 bits |= BITS_PARITY_SPACE;
958 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
959 }
960 } else {
961 if (cflag & PARODD) {
962 bits |= BITS_PARITY_ODD;
963 dev_dbg(dev, "%s - parity = ODD\n", __func__);
964 } else {
965 bits |= BITS_PARITY_EVEN;
966 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
967 }
968 }
969 }
970 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
971 dev_dbg(dev, "Parity mode not supported by device\n");
972 }
973
974 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
975 cp210x_get_line_ctl(port, &bits);
976 bits &= ~BITS_STOP_MASK;
977 if (cflag & CSTOPB) {
978 bits |= BITS_STOP_2;
979 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
980 } else {
981 bits |= BITS_STOP_1;
982 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
983 }
984 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
985 dev_dbg(dev, "Number of stop bits requested not supported by device\n");
986 }
987
988 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
989 struct cp210x_flow_ctl flow_ctl;
990 u32 ctl_hs;
991 u32 flow_repl;
992
993 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
994 sizeof(flow_ctl));
995 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
996 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
997 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
998 __func__, ctl_hs, flow_repl);
999
1000 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1001 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1002 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1003 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1004 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE);
1005 if (cflag & CRTSCTS) {
1006 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1007
1008 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1009 flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1010 CP210X_SERIAL_RTS_FLOW_CTL);
1011 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1012 } else {
1013 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1014
1015 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1016 flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1017 CP210X_SERIAL_RTS_ACTIVE);
1018 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1019 }
1020
1021 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1022 __func__, ctl_hs, flow_repl);
1023 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1024 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1025 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1026 sizeof(flow_ctl));
1027 }
1028
1029 }
1030
1031 static int cp210x_tiocmset(struct tty_struct *tty,
1032 unsigned int set, unsigned int clear)
1033 {
1034 struct usb_serial_port *port = tty->driver_data;
1035 return cp210x_tiocmset_port(port, set, clear);
1036 }
1037
1038 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1039 unsigned int set, unsigned int clear)
1040 {
1041 u16 control = 0;
1042
1043 if (set & TIOCM_RTS) {
1044 control |= CONTROL_RTS;
1045 control |= CONTROL_WRITE_RTS;
1046 }
1047 if (set & TIOCM_DTR) {
1048 control |= CONTROL_DTR;
1049 control |= CONTROL_WRITE_DTR;
1050 }
1051 if (clear & TIOCM_RTS) {
1052 control &= ~CONTROL_RTS;
1053 control |= CONTROL_WRITE_RTS;
1054 }
1055 if (clear & TIOCM_DTR) {
1056 control &= ~CONTROL_DTR;
1057 control |= CONTROL_WRITE_DTR;
1058 }
1059
1060 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
1061
1062 return cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1063 }
1064
1065 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
1066 {
1067 if (on)
1068 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
1069 else
1070 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
1071 }
1072
1073 static int cp210x_tiocmget(struct tty_struct *tty)
1074 {
1075 struct usb_serial_port *port = tty->driver_data;
1076 u8 control;
1077 int result;
1078
1079 cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1080
1081 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1082 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1083 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1084 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1085 |((control & CONTROL_RING)? TIOCM_RI : 0)
1086 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
1087
1088 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
1089
1090 return result;
1091 }
1092
1093 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1094 {
1095 struct usb_serial_port *port = tty->driver_data;
1096 u16 state;
1097
1098 if (break_state == 0)
1099 state = BREAK_OFF;
1100 else
1101 state = BREAK_ON;
1102 dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1103 state == BREAK_OFF ? "off" : "on");
1104 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1105 }
1106
1107 static int cp210x_port_probe(struct usb_serial_port *port)
1108 {
1109 struct usb_serial *serial = port->serial;
1110 struct usb_host_interface *cur_altsetting;
1111 struct cp210x_port_private *port_priv;
1112 int ret;
1113
1114 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1115 if (!port_priv)
1116 return -ENOMEM;
1117
1118 cur_altsetting = serial->interface->cur_altsetting;
1119 port_priv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber;
1120
1121 usb_set_serial_port_data(port, port_priv);
1122
1123 ret = cp210x_detect_swapped_line_ctl(port);
1124 if (ret) {
1125 kfree(port_priv);
1126 return ret;
1127 }
1128
1129 return 0;
1130 }
1131
1132 static int cp210x_port_remove(struct usb_serial_port *port)
1133 {
1134 struct cp210x_port_private *port_priv;
1135
1136 port_priv = usb_get_serial_port_data(port);
1137 kfree(port_priv);
1138
1139 return 0;
1140 }
1141
1142 module_usb_serial_driver(serial_drivers, id_table);
1143
1144 MODULE_DESCRIPTION(DRIVER_DESC);
1145 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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