mmc: rtsx_pci: Enable MMC_CAP_ERASE to allow erase/discard/trim requests
[linux/fpc-iii.git] / drivers / usb / serial / cp210x.c
blob96a70789b4c215376914aaa1196785bff53ce312
1 /*
2 * Silicon Laboratories CP210x USB to RS232 serial adaptor driver
4 * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License version
8 * 2 as published by the Free Software Foundation.
10 * Support to set flow control line levels using TIOCMGET and TIOCMSET
11 * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow
12 * control thanks to Munir Nassar nassarmu@real-time.com
16 #include <linux/kernel.h>
17 #include <linux/errno.h>
18 #include <linux/slab.h>
19 #include <linux/tty.h>
20 #include <linux/tty_flip.h>
21 #include <linux/module.h>
22 #include <linux/moduleparam.h>
23 #include <linux/usb.h>
24 #include <linux/uaccess.h>
25 #include <linux/usb/serial.h>
27 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
30 * Function Prototypes
32 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
33 static void cp210x_close(struct usb_serial_port *);
34 static void cp210x_get_termios(struct tty_struct *, struct usb_serial_port *);
35 static void cp210x_get_termios_port(struct usb_serial_port *port,
36 unsigned int *cflagp, unsigned int *baudp);
37 static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *,
38 struct ktermios *);
39 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
40 struct ktermios*);
41 static 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);
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 */
208 MODULE_DEVICE_TABLE(usb, id_table);
210 struct cp210x_port_private {
211 __u8 bInterfaceNumber;
212 bool has_swapped_line_ctl;
215 static struct usb_serial_driver cp210x_device = {
216 .driver = {
217 .owner = THIS_MODULE,
218 .name = "cp210x",
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
236 static struct usb_serial_driver * const serial_drivers[] = {
237 &cp210x_device, NULL
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
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
274 /* CP210X_IFC_ENABLE */
275 #define UART_ENABLE 0x0001
276 #define UART_DISABLE 0x0000
278 /* CP210X_(SET|GET)_BAUDDIV */
279 #define BAUD_RATE_GEN_FREQ 0x384000
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
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
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
301 /* CP210X_SET_BREAK */
302 #define BREAK_ON 0x0001
303 #define BREAK_OFF 0x0000
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
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;
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.
332 #define PURGE_ALL 0x000f
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;
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)
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
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)
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
371 * Reads a variable-sized block of CP210X_ registers, identified by req.
372 * Returns data into buf in native USB byte order.
374 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
375 void *buf, int bufsize)
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;
382 dmabuf = kmalloc(bufsize, GFP_KERNEL);
383 if (!dmabuf) {
385 * FIXME Some callers don't bother to check for error,
386 * at least give them consistent junk until they are fixed
388 memset(buf, 0, bufsize);
389 return -ENOMEM;
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;
406 * FIXME Some callers don't bother to check for error,
407 * at least give them consistent junk until they are fixed
409 memset(buf, 0, bufsize);
412 kfree(dmabuf);
414 return result;
418 * Reads any 32-bit CP210X_ register identified by req.
420 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val)
422 __le32 le32_val;
423 int err;
425 err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val));
426 if (err) {
428 * FIXME Some callers don't bother to check for error,
429 * at least give them consistent junk until they are fixed
431 *val = 0;
432 return err;
435 *val = le32_to_cpu(le32_val);
437 return 0;
441 * Reads any 16-bit CP210X_ register identified by req.
443 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val)
445 __le16 le16_val;
446 int err;
448 err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val));
449 if (err)
450 return err;
452 *val = le16_to_cpu(le16_val);
454 return 0;
458 * Reads any 8-bit CP210X_ register identified by req.
460 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
462 return cp210x_read_reg_block(port, req, val, sizeof(*val));
466 * Writes any 16-bit CP210X_ register (req) whose value is passed
467 * entirely in the wValue field of the USB request.
469 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
471 struct usb_serial *serial = port->serial;
472 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
473 int result;
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);
484 return result;
488 * Writes a variable-sized block of CP210X_ registers, identified by req.
489 * Data in buf must be in native USB byte order.
491 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
492 void *buf, int bufsize)
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;
499 dmabuf = kmalloc(bufsize, GFP_KERNEL);
500 if (!dmabuf)
501 return -ENOMEM;
503 memcpy(dmabuf, buf, bufsize);
505 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
506 req, REQTYPE_HOST_TO_INTERFACE, 0,
507 port_priv->bInterfaceNumber, dmabuf, bufsize,
508 USB_CTRL_SET_TIMEOUT);
510 kfree(dmabuf);
512 if (result == bufsize) {
513 result = 0;
514 } else {
515 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
516 req, bufsize, result);
517 if (result >= 0)
518 result = -EPROTO;
521 return result;
525 * Writes any 32-bit CP210X_ register identified by req.
527 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
529 __le32 le32_val;
531 le32_val = cpu_to_le32(val);
533 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
537 * Detect CP2108 GET_LINE_CTL bug and activate workaround.
538 * Write a known good value 0x800, read it back.
539 * If it comes back swapped the bug is detected.
540 * Preserve the original register value.
542 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
544 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
545 u16 line_ctl_save;
546 u16 line_ctl_test;
547 int err;
549 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save);
550 if (err)
551 return err;
553 err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800);
554 if (err)
555 return err;
557 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test);
558 if (err)
559 return err;
561 if (line_ctl_test == 8) {
562 port_priv->has_swapped_line_ctl = true;
563 line_ctl_save = swab16(line_ctl_save);
566 return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save);
570 * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL)
571 * to workaround cp2108 bug and get correct value.
573 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl)
575 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
576 int err;
578 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl);
579 if (err)
580 return err;
582 /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
583 if (port_priv->has_swapped_line_ctl)
584 *ctl = swab16(*ctl);
586 return 0;
590 * cp210x_quantise_baudrate
591 * Quantises the baud rate as per AN205 Table 1
593 static unsigned int cp210x_quantise_baudrate(unsigned int baud)
595 if (baud <= 300)
596 baud = 300;
597 else if (baud <= 600) baud = 600;
598 else if (baud <= 1200) baud = 1200;
599 else if (baud <= 1800) baud = 1800;
600 else if (baud <= 2400) baud = 2400;
601 else if (baud <= 4000) baud = 4000;
602 else if (baud <= 4803) baud = 4800;
603 else if (baud <= 7207) baud = 7200;
604 else if (baud <= 9612) baud = 9600;
605 else if (baud <= 14428) baud = 14400;
606 else if (baud <= 16062) baud = 16000;
607 else if (baud <= 19250) baud = 19200;
608 else if (baud <= 28912) baud = 28800;
609 else if (baud <= 38601) baud = 38400;
610 else if (baud <= 51558) baud = 51200;
611 else if (baud <= 56280) baud = 56000;
612 else if (baud <= 58053) baud = 57600;
613 else if (baud <= 64111) baud = 64000;
614 else if (baud <= 77608) baud = 76800;
615 else if (baud <= 117028) baud = 115200;
616 else if (baud <= 129347) baud = 128000;
617 else if (baud <= 156868) baud = 153600;
618 else if (baud <= 237832) baud = 230400;
619 else if (baud <= 254234) baud = 250000;
620 else if (baud <= 273066) baud = 256000;
621 else if (baud <= 491520) baud = 460800;
622 else if (baud <= 567138) baud = 500000;
623 else if (baud <= 670254) baud = 576000;
624 else if (baud < 1000000)
625 baud = 921600;
626 else if (baud > 2000000)
627 baud = 2000000;
628 return baud;
631 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
633 int result;
635 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
636 if (result) {
637 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
638 return result;
641 /* Configure the termios structure */
642 cp210x_get_termios(tty, port);
644 /* The baud rate must be initialised on cp2104 */
645 if (tty)
646 cp210x_change_speed(tty, port, NULL);
648 return usb_serial_generic_open(tty, port);
651 static void cp210x_close(struct usb_serial_port *port)
653 usb_serial_generic_close(port);
655 /* Clear both queues; cp2108 needs this to avoid an occasional hang */
656 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
658 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
662 * Read how many bytes are waiting in the TX queue.
664 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
665 u32 *count)
667 struct usb_serial *serial = port->serial;
668 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
669 struct cp210x_comm_status *sts;
670 int result;
672 sts = kmalloc(sizeof(*sts), GFP_KERNEL);
673 if (!sts)
674 return -ENOMEM;
676 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
677 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
678 0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
679 USB_CTRL_GET_TIMEOUT);
680 if (result == sizeof(*sts)) {
681 *count = le32_to_cpu(sts->ulAmountInOutQueue);
682 result = 0;
683 } else {
684 dev_err(&port->dev, "failed to get comm status: %d\n", result);
685 if (result >= 0)
686 result = -EPROTO;
689 kfree(sts);
691 return result;
694 static bool cp210x_tx_empty(struct usb_serial_port *port)
696 int err;
697 u32 count;
699 err = cp210x_get_tx_queue_byte_count(port, &count);
700 if (err)
701 return true;
703 return !count;
707 * cp210x_get_termios
708 * Reads the baud rate, data bits, parity, stop bits and flow control mode
709 * from the device, corrects any unsupported values, and configures the
710 * termios structure to reflect the state of the device
712 static void cp210x_get_termios(struct tty_struct *tty,
713 struct usb_serial_port *port)
715 unsigned int baud;
717 if (tty) {
718 cp210x_get_termios_port(tty->driver_data,
719 &tty->termios.c_cflag, &baud);
720 tty_encode_baud_rate(tty, baud, baud);
721 } else {
722 unsigned int cflag;
723 cflag = 0;
724 cp210x_get_termios_port(port, &cflag, &baud);
729 * cp210x_get_termios_port
730 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
732 static void cp210x_get_termios_port(struct usb_serial_port *port,
733 unsigned int *cflagp, unsigned int *baudp)
735 struct device *dev = &port->dev;
736 unsigned int cflag;
737 struct cp210x_flow_ctl flow_ctl;
738 u32 baud;
739 u16 bits;
740 u32 ctl_hs;
742 cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud);
744 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
745 *baudp = baud;
747 cflag = *cflagp;
749 cp210x_get_line_ctl(port, &bits);
750 cflag &= ~CSIZE;
751 switch (bits & BITS_DATA_MASK) {
752 case BITS_DATA_5:
753 dev_dbg(dev, "%s - data bits = 5\n", __func__);
754 cflag |= CS5;
755 break;
756 case BITS_DATA_6:
757 dev_dbg(dev, "%s - data bits = 6\n", __func__);
758 cflag |= CS6;
759 break;
760 case BITS_DATA_7:
761 dev_dbg(dev, "%s - data bits = 7\n", __func__);
762 cflag |= CS7;
763 break;
764 case BITS_DATA_8:
765 dev_dbg(dev, "%s - data bits = 8\n", __func__);
766 cflag |= CS8;
767 break;
768 case BITS_DATA_9:
769 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
770 cflag |= CS8;
771 bits &= ~BITS_DATA_MASK;
772 bits |= BITS_DATA_8;
773 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
774 break;
775 default:
776 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
777 cflag |= CS8;
778 bits &= ~BITS_DATA_MASK;
779 bits |= BITS_DATA_8;
780 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
781 break;
784 switch (bits & BITS_PARITY_MASK) {
785 case BITS_PARITY_NONE:
786 dev_dbg(dev, "%s - parity = NONE\n", __func__);
787 cflag &= ~PARENB;
788 break;
789 case BITS_PARITY_ODD:
790 dev_dbg(dev, "%s - parity = ODD\n", __func__);
791 cflag |= (PARENB|PARODD);
792 break;
793 case BITS_PARITY_EVEN:
794 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
795 cflag &= ~PARODD;
796 cflag |= PARENB;
797 break;
798 case BITS_PARITY_MARK:
799 dev_dbg(dev, "%s - parity = MARK\n", __func__);
800 cflag |= (PARENB|PARODD|CMSPAR);
801 break;
802 case BITS_PARITY_SPACE:
803 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
804 cflag &= ~PARODD;
805 cflag |= (PARENB|CMSPAR);
806 break;
807 default:
808 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
809 cflag &= ~PARENB;
810 bits &= ~BITS_PARITY_MASK;
811 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
812 break;
815 cflag &= ~CSTOPB;
816 switch (bits & BITS_STOP_MASK) {
817 case BITS_STOP_1:
818 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
819 break;
820 case BITS_STOP_1_5:
821 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
822 bits &= ~BITS_STOP_MASK;
823 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
824 break;
825 case BITS_STOP_2:
826 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
827 cflag |= CSTOPB;
828 break;
829 default:
830 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
831 bits &= ~BITS_STOP_MASK;
832 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
833 break;
836 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
837 sizeof(flow_ctl));
838 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
839 if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) {
840 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
841 cflag |= CRTSCTS;
842 } else {
843 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
844 cflag &= ~CRTSCTS;
847 *cflagp = cflag;
851 * CP2101 supports the following baud rates:
853 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
854 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
856 * CP2102 and CP2103 support the following additional rates:
858 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
859 * 576000
861 * The device will map a requested rate to a supported one, but the result
862 * of requests for rates greater than 1053257 is undefined (see AN205).
864 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
865 * respectively, with an error less than 1%. The actual rates are determined
866 * by
868 * div = round(freq / (2 x prescale x request))
869 * actual = freq / (2 x prescale x div)
871 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
872 * or 1 otherwise.
873 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
874 * otherwise.
876 static void cp210x_change_speed(struct tty_struct *tty,
877 struct usb_serial_port *port, struct ktermios *old_termios)
879 u32 baud;
881 baud = tty->termios.c_ospeed;
883 /* This maps the requested rate to a rate valid on cp2102 or cp2103,
884 * or to an arbitrary rate in [1M,2M].
886 * NOTE: B0 is not implemented.
888 baud = cp210x_quantise_baudrate(baud);
890 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
891 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
892 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
893 if (old_termios)
894 baud = old_termios->c_ospeed;
895 else
896 baud = 9600;
899 tty_encode_baud_rate(tty, baud, baud);
902 static void cp210x_set_termios(struct tty_struct *tty,
903 struct usb_serial_port *port, struct ktermios *old_termios)
905 struct device *dev = &port->dev;
906 unsigned int cflag, old_cflag;
907 u16 bits;
909 cflag = tty->termios.c_cflag;
910 old_cflag = old_termios->c_cflag;
912 if (tty->termios.c_ospeed != old_termios->c_ospeed)
913 cp210x_change_speed(tty, port, old_termios);
915 /* If the number of data bits is to be updated */
916 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
917 cp210x_get_line_ctl(port, &bits);
918 bits &= ~BITS_DATA_MASK;
919 switch (cflag & CSIZE) {
920 case CS5:
921 bits |= BITS_DATA_5;
922 dev_dbg(dev, "%s - data bits = 5\n", __func__);
923 break;
924 case CS6:
925 bits |= BITS_DATA_6;
926 dev_dbg(dev, "%s - data bits = 6\n", __func__);
927 break;
928 case CS7:
929 bits |= BITS_DATA_7;
930 dev_dbg(dev, "%s - data bits = 7\n", __func__);
931 break;
932 case CS8:
933 bits |= BITS_DATA_8;
934 dev_dbg(dev, "%s - data bits = 8\n", __func__);
935 break;
936 /*case CS9:
937 bits |= BITS_DATA_9;
938 dev_dbg(dev, "%s - data bits = 9\n", __func__);
939 break;*/
940 default:
941 dev_dbg(dev, "cp210x driver does not support the number of bits requested, using 8 bit mode\n");
942 bits |= BITS_DATA_8;
943 break;
945 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
946 dev_dbg(dev, "Number of data bits requested not supported by device\n");
949 if ((cflag & (PARENB|PARODD|CMSPAR)) !=
950 (old_cflag & (PARENB|PARODD|CMSPAR))) {
951 cp210x_get_line_ctl(port, &bits);
952 bits &= ~BITS_PARITY_MASK;
953 if (cflag & PARENB) {
954 if (cflag & CMSPAR) {
955 if (cflag & PARODD) {
956 bits |= BITS_PARITY_MARK;
957 dev_dbg(dev, "%s - parity = MARK\n", __func__);
958 } else {
959 bits |= BITS_PARITY_SPACE;
960 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
962 } else {
963 if (cflag & PARODD) {
964 bits |= BITS_PARITY_ODD;
965 dev_dbg(dev, "%s - parity = ODD\n", __func__);
966 } else {
967 bits |= BITS_PARITY_EVEN;
968 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
972 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
973 dev_dbg(dev, "Parity mode not supported by device\n");
976 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
977 cp210x_get_line_ctl(port, &bits);
978 bits &= ~BITS_STOP_MASK;
979 if (cflag & CSTOPB) {
980 bits |= BITS_STOP_2;
981 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
982 } else {
983 bits |= BITS_STOP_1;
984 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
986 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
987 dev_dbg(dev, "Number of stop bits requested not supported by device\n");
990 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
991 struct cp210x_flow_ctl flow_ctl;
992 u32 ctl_hs;
993 u32 flow_repl;
995 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
996 sizeof(flow_ctl));
997 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
998 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
999 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1000 __func__, ctl_hs, flow_repl);
1002 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1003 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1004 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1005 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1006 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE);
1007 if (cflag & CRTSCTS) {
1008 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1010 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1011 flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1012 CP210X_SERIAL_RTS_FLOW_CTL);
1013 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1014 } else {
1015 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1017 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1018 flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1019 CP210X_SERIAL_RTS_ACTIVE);
1020 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1023 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1024 __func__, ctl_hs, flow_repl);
1025 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1026 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1027 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1028 sizeof(flow_ctl));
1033 static int cp210x_tiocmset(struct tty_struct *tty,
1034 unsigned int set, unsigned int clear)
1036 struct usb_serial_port *port = tty->driver_data;
1037 return cp210x_tiocmset_port(port, set, clear);
1040 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1041 unsigned int set, unsigned int clear)
1043 u16 control = 0;
1045 if (set & TIOCM_RTS) {
1046 control |= CONTROL_RTS;
1047 control |= CONTROL_WRITE_RTS;
1049 if (set & TIOCM_DTR) {
1050 control |= CONTROL_DTR;
1051 control |= CONTROL_WRITE_DTR;
1053 if (clear & TIOCM_RTS) {
1054 control &= ~CONTROL_RTS;
1055 control |= CONTROL_WRITE_RTS;
1057 if (clear & TIOCM_DTR) {
1058 control &= ~CONTROL_DTR;
1059 control |= CONTROL_WRITE_DTR;
1062 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
1064 return cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1067 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
1069 if (on)
1070 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
1071 else
1072 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
1075 static int cp210x_tiocmget(struct tty_struct *tty)
1077 struct usb_serial_port *port = tty->driver_data;
1078 u8 control;
1079 int result;
1081 cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1083 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1084 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1085 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1086 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1087 |((control & CONTROL_RING)? TIOCM_RI : 0)
1088 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
1090 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
1092 return result;
1095 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1097 struct usb_serial_port *port = tty->driver_data;
1098 u16 state;
1100 if (break_state == 0)
1101 state = BREAK_OFF;
1102 else
1103 state = BREAK_ON;
1104 dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1105 state == BREAK_OFF ? "off" : "on");
1106 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1109 static int cp210x_port_probe(struct usb_serial_port *port)
1111 struct usb_serial *serial = port->serial;
1112 struct usb_host_interface *cur_altsetting;
1113 struct cp210x_port_private *port_priv;
1114 int ret;
1116 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1117 if (!port_priv)
1118 return -ENOMEM;
1120 cur_altsetting = serial->interface->cur_altsetting;
1121 port_priv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber;
1123 usb_set_serial_port_data(port, port_priv);
1125 ret = cp210x_detect_swapped_line_ctl(port);
1126 if (ret) {
1127 kfree(port_priv);
1128 return ret;
1131 return 0;
1134 static int cp210x_port_remove(struct usb_serial_port *port)
1136 struct cp210x_port_private *port_priv;
1138 port_priv = usb_get_serial_port_data(port);
1139 kfree(port_priv);
1141 return 0;
1144 module_usb_serial_driver(serial_drivers, id_table);
1146 MODULE_DESCRIPTION(DRIVER_DESC);
1147 MODULE_LICENSE("GPL");