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[mirror_ubuntu-bionic-kernel.git] / drivers / usb / serial / cp210x.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Silicon Laboratories CP210x USB to RS232 serial adaptor driver
4 *
5 * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
6 *
7 * Support to set flow control line levels using TIOCMGET and TIOCMSET
8 * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow
9 * control thanks to Munir Nassar nassarmu@real-time.com
10 *
11 */
12
13 #include <linux/kernel.h>
14 #include <linux/errno.h>
15 #include <linux/slab.h>
16 #include <linux/tty.h>
17 #include <linux/tty_flip.h>
18 #include <linux/module.h>
19 #include <linux/moduleparam.h>
20 #include <linux/usb.h>
21 #include <linux/uaccess.h>
22 #include <linux/usb/serial.h>
23 #include <linux/gpio/driver.h>
24 #include <linux/bitops.h>
25 #include <linux/mutex.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 tcflag_t *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_attach(struct usb_serial *);
48 static void cp210x_disconnect(struct usb_serial *);
49 static void cp210x_release(struct usb_serial *);
50 static int cp210x_port_probe(struct usb_serial_port *);
51 static int cp210x_port_remove(struct usb_serial_port *);
52 static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
53
54 static const struct usb_device_id id_table[] = {
55 { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */
56 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
57 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
58 { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
59 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
60 { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */
61 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
62 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
63 { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */
64 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
65 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
66 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
67 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
68 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
69 { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */
70 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
71 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
72 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
73 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
74 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
75 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
76 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
77 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
78 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
79 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
80 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
81 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
82 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
83 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
84 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
85 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
86 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
87 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
88 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
89 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
90 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
91 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
92 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
93 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
94 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
95 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
96 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
97 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
98 { USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */
99 { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */
100 { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */
101 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
102 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
103 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
104 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
105 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
106 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
107 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
108 { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */
109 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
110 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
111 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
112 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
113 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
114 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
115 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
116 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */
117 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
118 { USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */
119 { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */
120 { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */
121 { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */
122 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
123 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
124 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
125 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
126 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
127 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
128 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
129 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
130 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */
131 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
132 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
133 { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */
134 { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */
135 { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */
136 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
137 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
138 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
139 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
140 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
141 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
142 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
143 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
144 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
145 { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */
146 { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */
147 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
148 { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */
149 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
150 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
151 { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */
152 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
153 { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */
154 { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */
155 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
156 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
157 { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */
158 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
159 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
160 { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */
161 { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */
162 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
163 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
164 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
165 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
166 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
167 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
168 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
169 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
170 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
171 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
172 { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */
173 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
174 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
175 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
176 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
177 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
178 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
179 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
180 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
181 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
182 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
183 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
184 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
185 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
186 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
187 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
188 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
189 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
190 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
191 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
192 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
193 { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */
194 { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */
195 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
196 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
197 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
198 { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */
199 { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */
200 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
201 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
202 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
203 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
204 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
205 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
206 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
207 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
208 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
209 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
210 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
211 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
212 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
213 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
214 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
215 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
216 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
217 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
218 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
219 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
220 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
221 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
222 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
223 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
224 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
225 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
226 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
227 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
228 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
229 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
230 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
231 { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */
232 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
233 { } /* Terminating Entry */
234 };
235
236 MODULE_DEVICE_TABLE(usb, id_table);
237
238 struct cp210x_serial_private {
239 #ifdef CONFIG_GPIOLIB
240 struct gpio_chip gc;
241 u8 config;
242 u8 gpio_mode;
243 bool gpio_registered;
244 #endif
245 u8 partnum;
246 };
247
248 struct cp210x_port_private {
249 __u8 bInterfaceNumber;
250 bool has_swapped_line_ctl;
251 };
252
253 static struct usb_serial_driver cp210x_device = {
254 .driver = {
255 .owner = THIS_MODULE,
256 .name = "cp210x",
257 },
258 .id_table = id_table,
259 .num_ports = 1,
260 .bulk_in_size = 256,
261 .bulk_out_size = 256,
262 .open = cp210x_open,
263 .close = cp210x_close,
264 .break_ctl = cp210x_break_ctl,
265 .set_termios = cp210x_set_termios,
266 .tx_empty = cp210x_tx_empty,
267 .tiocmget = cp210x_tiocmget,
268 .tiocmset = cp210x_tiocmset,
269 .attach = cp210x_attach,
270 .disconnect = cp210x_disconnect,
271 .release = cp210x_release,
272 .port_probe = cp210x_port_probe,
273 .port_remove = cp210x_port_remove,
274 .dtr_rts = cp210x_dtr_rts
275 };
276
277 static struct usb_serial_driver * const serial_drivers[] = {
278 &cp210x_device, NULL
279 };
280
281 /* Config request types */
282 #define REQTYPE_HOST_TO_INTERFACE 0x41
283 #define REQTYPE_INTERFACE_TO_HOST 0xc1
284 #define REQTYPE_HOST_TO_DEVICE 0x40
285 #define REQTYPE_DEVICE_TO_HOST 0xc0
286
287 /* Config request codes */
288 #define CP210X_IFC_ENABLE 0x00
289 #define CP210X_SET_BAUDDIV 0x01
290 #define CP210X_GET_BAUDDIV 0x02
291 #define CP210X_SET_LINE_CTL 0x03
292 #define CP210X_GET_LINE_CTL 0x04
293 #define CP210X_SET_BREAK 0x05
294 #define CP210X_IMM_CHAR 0x06
295 #define CP210X_SET_MHS 0x07
296 #define CP210X_GET_MDMSTS 0x08
297 #define CP210X_SET_XON 0x09
298 #define CP210X_SET_XOFF 0x0A
299 #define CP210X_SET_EVENTMASK 0x0B
300 #define CP210X_GET_EVENTMASK 0x0C
301 #define CP210X_SET_CHAR 0x0D
302 #define CP210X_GET_CHARS 0x0E
303 #define CP210X_GET_PROPS 0x0F
304 #define CP210X_GET_COMM_STATUS 0x10
305 #define CP210X_RESET 0x11
306 #define CP210X_PURGE 0x12
307 #define CP210X_SET_FLOW 0x13
308 #define CP210X_GET_FLOW 0x14
309 #define CP210X_EMBED_EVENTS 0x15
310 #define CP210X_GET_EVENTSTATE 0x16
311 #define CP210X_SET_CHARS 0x19
312 #define CP210X_GET_BAUDRATE 0x1D
313 #define CP210X_SET_BAUDRATE 0x1E
314 #define CP210X_VENDOR_SPECIFIC 0xFF
315
316 /* CP210X_IFC_ENABLE */
317 #define UART_ENABLE 0x0001
318 #define UART_DISABLE 0x0000
319
320 /* CP210X_(SET|GET)_BAUDDIV */
321 #define BAUD_RATE_GEN_FREQ 0x384000
322
323 /* CP210X_(SET|GET)_LINE_CTL */
324 #define BITS_DATA_MASK 0X0f00
325 #define BITS_DATA_5 0X0500
326 #define BITS_DATA_6 0X0600
327 #define BITS_DATA_7 0X0700
328 #define BITS_DATA_8 0X0800
329 #define BITS_DATA_9 0X0900
330
331 #define BITS_PARITY_MASK 0x00f0
332 #define BITS_PARITY_NONE 0x0000
333 #define BITS_PARITY_ODD 0x0010
334 #define BITS_PARITY_EVEN 0x0020
335 #define BITS_PARITY_MARK 0x0030
336 #define BITS_PARITY_SPACE 0x0040
337
338 #define BITS_STOP_MASK 0x000f
339 #define BITS_STOP_1 0x0000
340 #define BITS_STOP_1_5 0x0001
341 #define BITS_STOP_2 0x0002
342
343 /* CP210X_SET_BREAK */
344 #define BREAK_ON 0x0001
345 #define BREAK_OFF 0x0000
346
347 /* CP210X_(SET_MHS|GET_MDMSTS) */
348 #define CONTROL_DTR 0x0001
349 #define CONTROL_RTS 0x0002
350 #define CONTROL_CTS 0x0010
351 #define CONTROL_DSR 0x0020
352 #define CONTROL_RING 0x0040
353 #define CONTROL_DCD 0x0080
354 #define CONTROL_WRITE_DTR 0x0100
355 #define CONTROL_WRITE_RTS 0x0200
356
357 /* CP210X_VENDOR_SPECIFIC values */
358 #define CP210X_READ_LATCH 0x00C2
359 #define CP210X_GET_PARTNUM 0x370B
360 #define CP210X_GET_PORTCONFIG 0x370C
361 #define CP210X_GET_DEVICEMODE 0x3711
362 #define CP210X_WRITE_LATCH 0x37E1
363
364 /* Part number definitions */
365 #define CP210X_PARTNUM_CP2101 0x01
366 #define CP210X_PARTNUM_CP2102 0x02
367 #define CP210X_PARTNUM_CP2103 0x03
368 #define CP210X_PARTNUM_CP2104 0x04
369 #define CP210X_PARTNUM_CP2105 0x05
370 #define CP210X_PARTNUM_CP2108 0x08
371 #define CP210X_PARTNUM_UNKNOWN 0xFF
372
373 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
374 struct cp210x_comm_status {
375 __le32 ulErrors;
376 __le32 ulHoldReasons;
377 __le32 ulAmountInInQueue;
378 __le32 ulAmountInOutQueue;
379 u8 bEofReceived;
380 u8 bWaitForImmediate;
381 u8 bReserved;
382 } __packed;
383
384 /*
385 * CP210X_PURGE - 16 bits passed in wValue of USB request.
386 * SiLabs app note AN571 gives a strange description of the 4 bits:
387 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
388 * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
389 */
390 #define PURGE_ALL 0x000f
391
392 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
393 struct cp210x_flow_ctl {
394 __le32 ulControlHandshake;
395 __le32 ulFlowReplace;
396 __le32 ulXonLimit;
397 __le32 ulXoffLimit;
398 } __packed;
399
400 /* cp210x_flow_ctl::ulControlHandshake */
401 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0)
402 #define CP210X_SERIAL_DTR_SHIFT(_mode) (_mode)
403 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3)
404 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4)
405 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5)
406 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6)
407
408 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */
409 #define CP210X_SERIAL_DTR_INACTIVE 0
410 #define CP210X_SERIAL_DTR_ACTIVE 1
411 #define CP210X_SERIAL_DTR_FLOW_CTL 2
412
413 /* cp210x_flow_ctl::ulFlowReplace */
414 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0)
415 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1)
416 #define CP210X_SERIAL_ERROR_CHAR BIT(2)
417 #define CP210X_SERIAL_NULL_STRIPPING BIT(3)
418 #define CP210X_SERIAL_BREAK_CHAR BIT(4)
419 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6)
420 #define CP210X_SERIAL_RTS_SHIFT(_mode) (_mode << 6)
421 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31)
422
423 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */
424 #define CP210X_SERIAL_RTS_INACTIVE 0
425 #define CP210X_SERIAL_RTS_ACTIVE 1
426 #define CP210X_SERIAL_RTS_FLOW_CTL 2
427
428 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
429 struct cp210x_pin_mode {
430 u8 eci;
431 u8 sci;
432 } __packed;
433
434 #define CP210X_PIN_MODE_MODEM 0
435 #define CP210X_PIN_MODE_GPIO BIT(0)
436
437 /*
438 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes.
439 * Structure needs padding due to unused/unspecified bytes.
440 */
441 struct cp210x_config {
442 __le16 gpio_mode;
443 u8 __pad0[2];
444 __le16 reset_state;
445 u8 __pad1[4];
446 __le16 suspend_state;
447 u8 sci_cfg;
448 u8 eci_cfg;
449 u8 device_cfg;
450 } __packed;
451
452 /* GPIO modes */
453 #define CP210X_SCI_GPIO_MODE_OFFSET 9
454 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9)
455
456 #define CP210X_ECI_GPIO_MODE_OFFSET 2
457 #define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2)
458
459 /* CP2105 port configuration values */
460 #define CP2105_GPIO0_TXLED_MODE BIT(0)
461 #define CP2105_GPIO1_RXLED_MODE BIT(1)
462 #define CP2105_GPIO1_RS485_MODE BIT(2)
463
464 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */
465 struct cp210x_gpio_write {
466 u8 mask;
467 u8 state;
468 } __packed;
469
470 /*
471 * Helper to get interface number when we only have struct usb_serial.
472 */
473 static u8 cp210x_interface_num(struct usb_serial *serial)
474 {
475 struct usb_host_interface *cur_altsetting;
476
477 cur_altsetting = serial->interface->cur_altsetting;
478
479 return cur_altsetting->desc.bInterfaceNumber;
480 }
481
482 /*
483 * Reads a variable-sized block of CP210X_ registers, identified by req.
484 * Returns data into buf in native USB byte order.
485 */
486 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
487 void *buf, int bufsize)
488 {
489 struct usb_serial *serial = port->serial;
490 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
491 void *dmabuf;
492 int result;
493
494 dmabuf = kmalloc(bufsize, GFP_KERNEL);
495 if (!dmabuf) {
496 /*
497 * FIXME Some callers don't bother to check for error,
498 * at least give them consistent junk until they are fixed
499 */
500 memset(buf, 0, bufsize);
501 return -ENOMEM;
502 }
503
504 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
505 req, REQTYPE_INTERFACE_TO_HOST, 0,
506 port_priv->bInterfaceNumber, dmabuf, bufsize,
507 USB_CTRL_SET_TIMEOUT);
508 if (result == bufsize) {
509 memcpy(buf, dmabuf, bufsize);
510 result = 0;
511 } else {
512 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
513 req, bufsize, result);
514 if (result >= 0)
515 result = -EIO;
516
517 /*
518 * FIXME Some callers don't bother to check for error,
519 * at least give them consistent junk until they are fixed
520 */
521 memset(buf, 0, bufsize);
522 }
523
524 kfree(dmabuf);
525
526 return result;
527 }
528
529 /*
530 * Reads any 32-bit CP210X_ register identified by req.
531 */
532 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val)
533 {
534 __le32 le32_val;
535 int err;
536
537 err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val));
538 if (err) {
539 /*
540 * FIXME Some callers don't bother to check for error,
541 * at least give them consistent junk until they are fixed
542 */
543 *val = 0;
544 return err;
545 }
546
547 *val = le32_to_cpu(le32_val);
548
549 return 0;
550 }
551
552 /*
553 * Reads any 16-bit CP210X_ register identified by req.
554 */
555 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val)
556 {
557 __le16 le16_val;
558 int err;
559
560 err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val));
561 if (err)
562 return err;
563
564 *val = le16_to_cpu(le16_val);
565
566 return 0;
567 }
568
569 /*
570 * Reads any 8-bit CP210X_ register identified by req.
571 */
572 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
573 {
574 return cp210x_read_reg_block(port, req, val, sizeof(*val));
575 }
576
577 /*
578 * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
579 * Returns data into buf in native USB byte order.
580 */
581 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
582 void *buf, int bufsize)
583 {
584 void *dmabuf;
585 int result;
586
587 dmabuf = kmalloc(bufsize, GFP_KERNEL);
588 if (!dmabuf)
589 return -ENOMEM;
590
591 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
592 CP210X_VENDOR_SPECIFIC, type, val,
593 cp210x_interface_num(serial), dmabuf, bufsize,
594 USB_CTRL_GET_TIMEOUT);
595 if (result == bufsize) {
596 memcpy(buf, dmabuf, bufsize);
597 result = 0;
598 } else {
599 dev_err(&serial->interface->dev,
600 "failed to get vendor val 0x%04x size %d: %d\n", val,
601 bufsize, result);
602 if (result >= 0)
603 result = -EIO;
604 }
605
606 kfree(dmabuf);
607
608 return result;
609 }
610
611 /*
612 * Writes any 16-bit CP210X_ register (req) whose value is passed
613 * entirely in the wValue field of the USB request.
614 */
615 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
616 {
617 struct usb_serial *serial = port->serial;
618 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
619 int result;
620
621 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
622 req, REQTYPE_HOST_TO_INTERFACE, val,
623 port_priv->bInterfaceNumber, NULL, 0,
624 USB_CTRL_SET_TIMEOUT);
625 if (result < 0) {
626 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
627 req, result);
628 }
629
630 return result;
631 }
632
633 /*
634 * Writes a variable-sized block of CP210X_ registers, identified by req.
635 * Data in buf must be in native USB byte order.
636 */
637 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
638 void *buf, int bufsize)
639 {
640 struct usb_serial *serial = port->serial;
641 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
642 void *dmabuf;
643 int result;
644
645 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
646 if (!dmabuf)
647 return -ENOMEM;
648
649 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
650 req, REQTYPE_HOST_TO_INTERFACE, 0,
651 port_priv->bInterfaceNumber, dmabuf, bufsize,
652 USB_CTRL_SET_TIMEOUT);
653
654 kfree(dmabuf);
655
656 if (result == bufsize) {
657 result = 0;
658 } else {
659 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
660 req, bufsize, result);
661 if (result >= 0)
662 result = -EIO;
663 }
664
665 return result;
666 }
667
668 /*
669 * Writes any 32-bit CP210X_ register identified by req.
670 */
671 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
672 {
673 __le32 le32_val;
674
675 le32_val = cpu_to_le32(val);
676
677 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
678 }
679
680 #ifdef CONFIG_GPIOLIB
681 /*
682 * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
683 * Data in buf must be in native USB byte order.
684 */
685 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
686 u16 val, void *buf, int bufsize)
687 {
688 void *dmabuf;
689 int result;
690
691 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
692 if (!dmabuf)
693 return -ENOMEM;
694
695 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
696 CP210X_VENDOR_SPECIFIC, type, val,
697 cp210x_interface_num(serial), dmabuf, bufsize,
698 USB_CTRL_SET_TIMEOUT);
699
700 kfree(dmabuf);
701
702 if (result == bufsize) {
703 result = 0;
704 } else {
705 dev_err(&serial->interface->dev,
706 "failed to set vendor val 0x%04x size %d: %d\n", val,
707 bufsize, result);
708 if (result >= 0)
709 result = -EIO;
710 }
711
712 return result;
713 }
714 #endif
715
716 /*
717 * Detect CP2108 GET_LINE_CTL bug and activate workaround.
718 * Write a known good value 0x800, read it back.
719 * If it comes back swapped the bug is detected.
720 * Preserve the original register value.
721 */
722 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
723 {
724 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
725 u16 line_ctl_save;
726 u16 line_ctl_test;
727 int err;
728
729 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save);
730 if (err)
731 return err;
732
733 err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800);
734 if (err)
735 return err;
736
737 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test);
738 if (err)
739 return err;
740
741 if (line_ctl_test == 8) {
742 port_priv->has_swapped_line_ctl = true;
743 line_ctl_save = swab16(line_ctl_save);
744 }
745
746 return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save);
747 }
748
749 /*
750 * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL)
751 * to workaround cp2108 bug and get correct value.
752 */
753 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl)
754 {
755 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
756 int err;
757
758 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl);
759 if (err)
760 return err;
761
762 /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
763 if (port_priv->has_swapped_line_ctl)
764 *ctl = swab16(*ctl);
765
766 return 0;
767 }
768
769 /*
770 * cp210x_quantise_baudrate
771 * Quantises the baud rate as per AN205 Table 1
772 */
773 static unsigned int cp210x_quantise_baudrate(unsigned int baud)
774 {
775 if (baud <= 300)
776 baud = 300;
777 else if (baud <= 600) baud = 600;
778 else if (baud <= 1200) baud = 1200;
779 else if (baud <= 1800) baud = 1800;
780 else if (baud <= 2400) baud = 2400;
781 else if (baud <= 4000) baud = 4000;
782 else if (baud <= 4803) baud = 4800;
783 else if (baud <= 7207) baud = 7200;
784 else if (baud <= 9612) baud = 9600;
785 else if (baud <= 14428) baud = 14400;
786 else if (baud <= 16062) baud = 16000;
787 else if (baud <= 19250) baud = 19200;
788 else if (baud <= 28912) baud = 28800;
789 else if (baud <= 38601) baud = 38400;
790 else if (baud <= 51558) baud = 51200;
791 else if (baud <= 56280) baud = 56000;
792 else if (baud <= 58053) baud = 57600;
793 else if (baud <= 64111) baud = 64000;
794 else if (baud <= 77608) baud = 76800;
795 else if (baud <= 117028) baud = 115200;
796 else if (baud <= 129347) baud = 128000;
797 else if (baud <= 156868) baud = 153600;
798 else if (baud <= 237832) baud = 230400;
799 else if (baud <= 254234) baud = 250000;
800 else if (baud <= 273066) baud = 256000;
801 else if (baud <= 491520) baud = 460800;
802 else if (baud <= 567138) baud = 500000;
803 else if (baud <= 670254) baud = 576000;
804 else if (baud < 1000000)
805 baud = 921600;
806 else if (baud > 2000000)
807 baud = 2000000;
808 return baud;
809 }
810
811 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
812 {
813 int result;
814
815 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
816 if (result) {
817 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
818 return result;
819 }
820
821 /* Configure the termios structure */
822 cp210x_get_termios(tty, port);
823
824 /* The baud rate must be initialised on cp2104 */
825 if (tty)
826 cp210x_change_speed(tty, port, NULL);
827
828 return usb_serial_generic_open(tty, port);
829 }
830
831 static void cp210x_close(struct usb_serial_port *port)
832 {
833 usb_serial_generic_close(port);
834
835 /* Clear both queues; cp2108 needs this to avoid an occasional hang */
836 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
837
838 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
839 }
840
841 /*
842 * Read how many bytes are waiting in the TX queue.
843 */
844 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
845 u32 *count)
846 {
847 struct usb_serial *serial = port->serial;
848 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
849 struct cp210x_comm_status *sts;
850 int result;
851
852 sts = kmalloc(sizeof(*sts), GFP_KERNEL);
853 if (!sts)
854 return -ENOMEM;
855
856 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
857 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
858 0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
859 USB_CTRL_GET_TIMEOUT);
860 if (result == sizeof(*sts)) {
861 *count = le32_to_cpu(sts->ulAmountInOutQueue);
862 result = 0;
863 } else {
864 dev_err(&port->dev, "failed to get comm status: %d\n", result);
865 if (result >= 0)
866 result = -EIO;
867 }
868
869 kfree(sts);
870
871 return result;
872 }
873
874 static bool cp210x_tx_empty(struct usb_serial_port *port)
875 {
876 int err;
877 u32 count;
878
879 err = cp210x_get_tx_queue_byte_count(port, &count);
880 if (err)
881 return true;
882
883 return !count;
884 }
885
886 /*
887 * cp210x_get_termios
888 * Reads the baud rate, data bits, parity, stop bits and flow control mode
889 * from the device, corrects any unsupported values, and configures the
890 * termios structure to reflect the state of the device
891 */
892 static void cp210x_get_termios(struct tty_struct *tty,
893 struct usb_serial_port *port)
894 {
895 unsigned int baud;
896
897 if (tty) {
898 cp210x_get_termios_port(tty->driver_data,
899 &tty->termios.c_cflag, &baud);
900 tty_encode_baud_rate(tty, baud, baud);
901 } else {
902 tcflag_t cflag;
903 cflag = 0;
904 cp210x_get_termios_port(port, &cflag, &baud);
905 }
906 }
907
908 /*
909 * cp210x_get_termios_port
910 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
911 */
912 static void cp210x_get_termios_port(struct usb_serial_port *port,
913 tcflag_t *cflagp, unsigned int *baudp)
914 {
915 struct device *dev = &port->dev;
916 tcflag_t cflag;
917 struct cp210x_flow_ctl flow_ctl;
918 u32 baud;
919 u16 bits;
920 u32 ctl_hs;
921
922 cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud);
923
924 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
925 *baudp = baud;
926
927 cflag = *cflagp;
928
929 cp210x_get_line_ctl(port, &bits);
930 cflag &= ~CSIZE;
931 switch (bits & BITS_DATA_MASK) {
932 case BITS_DATA_5:
933 dev_dbg(dev, "%s - data bits = 5\n", __func__);
934 cflag |= CS5;
935 break;
936 case BITS_DATA_6:
937 dev_dbg(dev, "%s - data bits = 6\n", __func__);
938 cflag |= CS6;
939 break;
940 case BITS_DATA_7:
941 dev_dbg(dev, "%s - data bits = 7\n", __func__);
942 cflag |= CS7;
943 break;
944 case BITS_DATA_8:
945 dev_dbg(dev, "%s - data bits = 8\n", __func__);
946 cflag |= CS8;
947 break;
948 case BITS_DATA_9:
949 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
950 cflag |= CS8;
951 bits &= ~BITS_DATA_MASK;
952 bits |= BITS_DATA_8;
953 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
954 break;
955 default:
956 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
957 cflag |= CS8;
958 bits &= ~BITS_DATA_MASK;
959 bits |= BITS_DATA_8;
960 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
961 break;
962 }
963
964 switch (bits & BITS_PARITY_MASK) {
965 case BITS_PARITY_NONE:
966 dev_dbg(dev, "%s - parity = NONE\n", __func__);
967 cflag &= ~PARENB;
968 break;
969 case BITS_PARITY_ODD:
970 dev_dbg(dev, "%s - parity = ODD\n", __func__);
971 cflag |= (PARENB|PARODD);
972 break;
973 case BITS_PARITY_EVEN:
974 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
975 cflag &= ~PARODD;
976 cflag |= PARENB;
977 break;
978 case BITS_PARITY_MARK:
979 dev_dbg(dev, "%s - parity = MARK\n", __func__);
980 cflag |= (PARENB|PARODD|CMSPAR);
981 break;
982 case BITS_PARITY_SPACE:
983 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
984 cflag &= ~PARODD;
985 cflag |= (PARENB|CMSPAR);
986 break;
987 default:
988 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
989 cflag &= ~PARENB;
990 bits &= ~BITS_PARITY_MASK;
991 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
992 break;
993 }
994
995 cflag &= ~CSTOPB;
996 switch (bits & BITS_STOP_MASK) {
997 case BITS_STOP_1:
998 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
999 break;
1000 case BITS_STOP_1_5:
1001 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
1002 bits &= ~BITS_STOP_MASK;
1003 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1004 break;
1005 case BITS_STOP_2:
1006 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1007 cflag |= CSTOPB;
1008 break;
1009 default:
1010 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
1011 bits &= ~BITS_STOP_MASK;
1012 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1013 break;
1014 }
1015
1016 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1017 sizeof(flow_ctl));
1018 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1019 if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) {
1020 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1021 cflag |= CRTSCTS;
1022 } else {
1023 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1024 cflag &= ~CRTSCTS;
1025 }
1026
1027 *cflagp = cflag;
1028 }
1029
1030 /*
1031 * CP2101 supports the following baud rates:
1032 *
1033 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
1034 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
1035 *
1036 * CP2102 and CP2103 support the following additional rates:
1037 *
1038 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
1039 * 576000
1040 *
1041 * The device will map a requested rate to a supported one, but the result
1042 * of requests for rates greater than 1053257 is undefined (see AN205).
1043 *
1044 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
1045 * respectively, with an error less than 1%. The actual rates are determined
1046 * by
1047 *
1048 * div = round(freq / (2 x prescale x request))
1049 * actual = freq / (2 x prescale x div)
1050 *
1051 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1052 * or 1 otherwise.
1053 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1054 * otherwise.
1055 */
1056 static void cp210x_change_speed(struct tty_struct *tty,
1057 struct usb_serial_port *port, struct ktermios *old_termios)
1058 {
1059 u32 baud;
1060
1061 baud = tty->termios.c_ospeed;
1062
1063 /* This maps the requested rate to a rate valid on cp2102 or cp2103,
1064 * or to an arbitrary rate in [1M,2M].
1065 *
1066 * NOTE: B0 is not implemented.
1067 */
1068 baud = cp210x_quantise_baudrate(baud);
1069
1070 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1071 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1072 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1073 if (old_termios)
1074 baud = old_termios->c_ospeed;
1075 else
1076 baud = 9600;
1077 }
1078
1079 tty_encode_baud_rate(tty, baud, baud);
1080 }
1081
1082 static void cp210x_set_termios(struct tty_struct *tty,
1083 struct usb_serial_port *port, struct ktermios *old_termios)
1084 {
1085 struct device *dev = &port->dev;
1086 unsigned int cflag, old_cflag;
1087 u16 bits;
1088
1089 cflag = tty->termios.c_cflag;
1090 old_cflag = old_termios->c_cflag;
1091
1092 if (tty->termios.c_ospeed != old_termios->c_ospeed)
1093 cp210x_change_speed(tty, port, old_termios);
1094
1095 /* If the number of data bits is to be updated */
1096 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
1097 cp210x_get_line_ctl(port, &bits);
1098 bits &= ~BITS_DATA_MASK;
1099 switch (cflag & CSIZE) {
1100 case CS5:
1101 bits |= BITS_DATA_5;
1102 dev_dbg(dev, "%s - data bits = 5\n", __func__);
1103 break;
1104 case CS6:
1105 bits |= BITS_DATA_6;
1106 dev_dbg(dev, "%s - data bits = 6\n", __func__);
1107 break;
1108 case CS7:
1109 bits |= BITS_DATA_7;
1110 dev_dbg(dev, "%s - data bits = 7\n", __func__);
1111 break;
1112 case CS8:
1113 default:
1114 bits |= BITS_DATA_8;
1115 dev_dbg(dev, "%s - data bits = 8\n", __func__);
1116 break;
1117 }
1118 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1119 dev_dbg(dev, "Number of data bits requested not supported by device\n");
1120 }
1121
1122 if ((cflag & (PARENB|PARODD|CMSPAR)) !=
1123 (old_cflag & (PARENB|PARODD|CMSPAR))) {
1124 cp210x_get_line_ctl(port, &bits);
1125 bits &= ~BITS_PARITY_MASK;
1126 if (cflag & PARENB) {
1127 if (cflag & CMSPAR) {
1128 if (cflag & PARODD) {
1129 bits |= BITS_PARITY_MARK;
1130 dev_dbg(dev, "%s - parity = MARK\n", __func__);
1131 } else {
1132 bits |= BITS_PARITY_SPACE;
1133 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
1134 }
1135 } else {
1136 if (cflag & PARODD) {
1137 bits |= BITS_PARITY_ODD;
1138 dev_dbg(dev, "%s - parity = ODD\n", __func__);
1139 } else {
1140 bits |= BITS_PARITY_EVEN;
1141 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
1142 }
1143 }
1144 }
1145 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1146 dev_dbg(dev, "Parity mode not supported by device\n");
1147 }
1148
1149 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
1150 cp210x_get_line_ctl(port, &bits);
1151 bits &= ~BITS_STOP_MASK;
1152 if (cflag & CSTOPB) {
1153 bits |= BITS_STOP_2;
1154 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1155 } else {
1156 bits |= BITS_STOP_1;
1157 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
1158 }
1159 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1160 dev_dbg(dev, "Number of stop bits requested not supported by device\n");
1161 }
1162
1163 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
1164 struct cp210x_flow_ctl flow_ctl;
1165 u32 ctl_hs;
1166 u32 flow_repl;
1167
1168 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1169 sizeof(flow_ctl));
1170 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1171 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1172 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1173 __func__, ctl_hs, flow_repl);
1174
1175 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1176 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1177 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1178 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1179 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE);
1180 if (cflag & CRTSCTS) {
1181 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1182
1183 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1184 flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1185 CP210X_SERIAL_RTS_FLOW_CTL);
1186 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1187 } else {
1188 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1189
1190 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1191 flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1192 CP210X_SERIAL_RTS_ACTIVE);
1193 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1194 }
1195
1196 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1197 __func__, ctl_hs, flow_repl);
1198 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1199 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1200 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1201 sizeof(flow_ctl));
1202 }
1203
1204 }
1205
1206 static int cp210x_tiocmset(struct tty_struct *tty,
1207 unsigned int set, unsigned int clear)
1208 {
1209 struct usb_serial_port *port = tty->driver_data;
1210 return cp210x_tiocmset_port(port, set, clear);
1211 }
1212
1213 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1214 unsigned int set, unsigned int clear)
1215 {
1216 u16 control = 0;
1217
1218 if (set & TIOCM_RTS) {
1219 control |= CONTROL_RTS;
1220 control |= CONTROL_WRITE_RTS;
1221 }
1222 if (set & TIOCM_DTR) {
1223 control |= CONTROL_DTR;
1224 control |= CONTROL_WRITE_DTR;
1225 }
1226 if (clear & TIOCM_RTS) {
1227 control &= ~CONTROL_RTS;
1228 control |= CONTROL_WRITE_RTS;
1229 }
1230 if (clear & TIOCM_DTR) {
1231 control &= ~CONTROL_DTR;
1232 control |= CONTROL_WRITE_DTR;
1233 }
1234
1235 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
1236
1237 return cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1238 }
1239
1240 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
1241 {
1242 if (on)
1243 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
1244 else
1245 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
1246 }
1247
1248 static int cp210x_tiocmget(struct tty_struct *tty)
1249 {
1250 struct usb_serial_port *port = tty->driver_data;
1251 u8 control;
1252 int result;
1253
1254 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1255 if (result)
1256 return result;
1257
1258 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1259 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1260 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1261 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1262 |((control & CONTROL_RING)? TIOCM_RI : 0)
1263 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
1264
1265 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
1266
1267 return result;
1268 }
1269
1270 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1271 {
1272 struct usb_serial_port *port = tty->driver_data;
1273 u16 state;
1274
1275 if (break_state == 0)
1276 state = BREAK_OFF;
1277 else
1278 state = BREAK_ON;
1279 dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1280 state == BREAK_OFF ? "off" : "on");
1281 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1282 }
1283
1284 #ifdef CONFIG_GPIOLIB
1285 static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset)
1286 {
1287 struct usb_serial *serial = gpiochip_get_data(gc);
1288 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1289
1290 switch (offset) {
1291 case 0:
1292 if (priv->config & CP2105_GPIO0_TXLED_MODE)
1293 return -ENODEV;
1294 break;
1295 case 1:
1296 if (priv->config & (CP2105_GPIO1_RXLED_MODE |
1297 CP2105_GPIO1_RS485_MODE))
1298 return -ENODEV;
1299 break;
1300 }
1301
1302 return 0;
1303 }
1304
1305 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1306 {
1307 struct usb_serial *serial = gpiochip_get_data(gc);
1308 int result;
1309 u8 buf;
1310
1311 result = cp210x_read_vendor_block(serial, REQTYPE_INTERFACE_TO_HOST,
1312 CP210X_READ_LATCH, &buf, sizeof(buf));
1313 if (result < 0)
1314 return result;
1315
1316 return !!(buf & BIT(gpio));
1317 }
1318
1319 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1320 {
1321 struct usb_serial *serial = gpiochip_get_data(gc);
1322 struct cp210x_gpio_write buf;
1323
1324 if (value == 1)
1325 buf.state = BIT(gpio);
1326 else
1327 buf.state = 0;
1328
1329 buf.mask = BIT(gpio);
1330
1331 cp210x_write_vendor_block(serial, REQTYPE_HOST_TO_INTERFACE,
1332 CP210X_WRITE_LATCH, &buf, sizeof(buf));
1333 }
1334
1335 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1336 {
1337 /* Hardware does not support an input mode */
1338 return 0;
1339 }
1340
1341 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
1342 {
1343 /* Hardware does not support an input mode */
1344 return -ENOTSUPP;
1345 }
1346
1347 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1348 int value)
1349 {
1350 return 0;
1351 }
1352
1353 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
1354 unsigned long config)
1355 {
1356 struct usb_serial *serial = gpiochip_get_data(gc);
1357 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1358 enum pin_config_param param = pinconf_to_config_param(config);
1359
1360 /* Succeed only if in correct mode (this can't be set at runtime) */
1361 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) &&
1362 (priv->gpio_mode & BIT(gpio)))
1363 return 0;
1364
1365 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) &&
1366 !(priv->gpio_mode & BIT(gpio)))
1367 return 0;
1368
1369 return -ENOTSUPP;
1370 }
1371
1372 /*
1373 * This function is for configuring GPIO using shared pins, where other signals
1374 * are made unavailable by configuring the use of GPIO. This is believed to be
1375 * only applicable to the cp2105 at this point, the other devices supported by
1376 * this driver that provide GPIO do so in a way that does not impact other
1377 * signals and are thus expected to have very different initialisation.
1378 */
1379 static int cp2105_shared_gpio_init(struct usb_serial *serial)
1380 {
1381 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1382 struct cp210x_pin_mode mode;
1383 struct cp210x_config config;
1384 u8 intf_num = cp210x_interface_num(serial);
1385 int result;
1386
1387 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1388 CP210X_GET_DEVICEMODE, &mode,
1389 sizeof(mode));
1390 if (result < 0)
1391 return result;
1392
1393 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1394 CP210X_GET_PORTCONFIG, &config,
1395 sizeof(config));
1396 if (result < 0)
1397 return result;
1398
1399 /* 2 banks of GPIO - One for the pins taken from each serial port */
1400 if (intf_num == 0) {
1401 if (mode.eci == CP210X_PIN_MODE_MODEM)
1402 return 0;
1403
1404 priv->config = config.eci_cfg;
1405 priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) &
1406 CP210X_ECI_GPIO_MODE_MASK) >>
1407 CP210X_ECI_GPIO_MODE_OFFSET);
1408 priv->gc.ngpio = 2;
1409 } else if (intf_num == 1) {
1410 if (mode.sci == CP210X_PIN_MODE_MODEM)
1411 return 0;
1412
1413 priv->config = config.sci_cfg;
1414 priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) &
1415 CP210X_SCI_GPIO_MODE_MASK) >>
1416 CP210X_SCI_GPIO_MODE_OFFSET);
1417 priv->gc.ngpio = 3;
1418 } else {
1419 return -ENODEV;
1420 }
1421
1422 priv->gc.label = "cp210x";
1423 priv->gc.request = cp210x_gpio_request;
1424 priv->gc.get_direction = cp210x_gpio_direction_get;
1425 priv->gc.direction_input = cp210x_gpio_direction_input;
1426 priv->gc.direction_output = cp210x_gpio_direction_output;
1427 priv->gc.get = cp210x_gpio_get;
1428 priv->gc.set = cp210x_gpio_set;
1429 priv->gc.set_config = cp210x_gpio_set_config;
1430 priv->gc.owner = THIS_MODULE;
1431 priv->gc.parent = &serial->interface->dev;
1432 priv->gc.base = -1;
1433 priv->gc.can_sleep = true;
1434
1435 result = gpiochip_add_data(&priv->gc, serial);
1436 if (!result)
1437 priv->gpio_registered = true;
1438
1439 return result;
1440 }
1441
1442 static void cp210x_gpio_remove(struct usb_serial *serial)
1443 {
1444 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1445
1446 if (priv->gpio_registered) {
1447 gpiochip_remove(&priv->gc);
1448 priv->gpio_registered = false;
1449 }
1450 }
1451
1452 #else
1453
1454 static int cp2105_shared_gpio_init(struct usb_serial *serial)
1455 {
1456 return 0;
1457 }
1458
1459 static void cp210x_gpio_remove(struct usb_serial *serial)
1460 {
1461 /* Nothing to do */
1462 }
1463
1464 #endif
1465
1466 static int cp210x_port_probe(struct usb_serial_port *port)
1467 {
1468 struct usb_serial *serial = port->serial;
1469 struct cp210x_port_private *port_priv;
1470 int ret;
1471
1472 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1473 if (!port_priv)
1474 return -ENOMEM;
1475
1476 port_priv->bInterfaceNumber = cp210x_interface_num(serial);
1477
1478 usb_set_serial_port_data(port, port_priv);
1479
1480 ret = cp210x_detect_swapped_line_ctl(port);
1481 if (ret) {
1482 kfree(port_priv);
1483 return ret;
1484 }
1485
1486 return 0;
1487 }
1488
1489 static int cp210x_port_remove(struct usb_serial_port *port)
1490 {
1491 struct cp210x_port_private *port_priv;
1492
1493 port_priv = usb_get_serial_port_data(port);
1494 kfree(port_priv);
1495
1496 return 0;
1497 }
1498
1499 static int cp210x_attach(struct usb_serial *serial)
1500 {
1501 int result;
1502 struct cp210x_serial_private *priv;
1503
1504 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1505 if (!priv)
1506 return -ENOMEM;
1507
1508 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1509 CP210X_GET_PARTNUM, &priv->partnum,
1510 sizeof(priv->partnum));
1511 if (result < 0) {
1512 dev_warn(&serial->interface->dev,
1513 "querying part number failed\n");
1514 priv->partnum = CP210X_PARTNUM_UNKNOWN;
1515 }
1516
1517 usb_set_serial_data(serial, priv);
1518
1519 if (priv->partnum == CP210X_PARTNUM_CP2105) {
1520 result = cp2105_shared_gpio_init(serial);
1521 if (result < 0) {
1522 dev_err(&serial->interface->dev,
1523 "GPIO initialisation failed, continuing without GPIO support\n");
1524 }
1525 }
1526
1527 return 0;
1528 }
1529
1530 static void cp210x_disconnect(struct usb_serial *serial)
1531 {
1532 cp210x_gpio_remove(serial);
1533 }
1534
1535 static void cp210x_release(struct usb_serial *serial)
1536 {
1537 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1538
1539 cp210x_gpio_remove(serial);
1540
1541 kfree(priv);
1542 }
1543
1544 module_usb_serial_driver(serial_drivers, id_table);
1545
1546 MODULE_DESCRIPTION(DRIVER_DESC);
1547 MODULE_LICENSE("GPL v2");
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