1 /*
2 * Silicon Laboratories CP210x USB to RS232 serial adaptor driver
3 *
4 * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License version
8 * 2 as published by the Free Software Foundation.
9 *
10 * Support to set flow control line levels using TIOCMGET and TIOCMSET
11 * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow
12 * control thanks to Munir Nassar nassarmu@real-time.com
13 *
14 */
15
16 #include <linux/kernel.h>
17 #include <linux/errno.h>
18 #include <linux/slab.h>
19 #include <linux/tty.h>
20 #include <linux/tty_flip.h>
21 #include <linux/module.h>
22 #include <linux/moduleparam.h>
23 #include <linux/usb.h>
24 #include <linux/uaccess.h>
25 #include <linux/usb/serial.h>
26 #include <linux/gpio/driver.h>
27 #include <linux/bitops.h>
28 #include <linux/mutex.h>
29
30 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
31
32 /*
33 * Function Prototypes
34 */
35 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
36 static void cp210x_close(struct usb_serial_port *);
37 static void cp210x_get_termios(struct tty_struct *, struct usb_serial_port *);
38 static void cp210x_get_termios_port(struct usb_serial_port *port,
39 tcflag_t *cflagp, unsigned int *baudp);
40 static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *,
41 struct ktermios *);
42 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
43 struct ktermios*);
44 static bool cp210x_tx_empty(struct usb_serial_port *port);
45 static int cp210x_tiocmget(struct tty_struct *);
46 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
47 static int cp210x_tiocmset_port(struct usb_serial_port *port,
48 unsigned int, unsigned int);
49 static void cp210x_break_ctl(struct tty_struct *, int);
50 static int cp210x_attach(struct usb_serial *);
51 static void cp210x_disconnect(struct usb_serial *);
52 static void cp210x_release(struct usb_serial *);
53 static int cp210x_port_probe(struct usb_serial_port *);
54 static int cp210x_port_remove(struct usb_serial_port *);
55 static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
56
57 static const struct usb_device_id id_table[] = {
58 { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */
59 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
60 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
61 { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
62 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
63 { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */
64 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
65 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
66 { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */
67 { USB_DEVICE(0x0B00, 0x3070) }, /* Ingenico 3070 */
68 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
69 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
70 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
71 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
72 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
73 { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */
74 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
75 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
76 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
77 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
78 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
79 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
80 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
81 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
82 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
83 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
84 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
85 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
86 { USB_DEVICE(0x10C4, 0x8056) }, /* Lorenz Messtechnik devices */
87 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
88 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
89 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
90 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
91 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
92 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
93 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
94 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
95 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
96 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
97 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
98 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
99 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
100 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
101 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
102 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
103 { USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */
104 { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */
105 { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */
106 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
107 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
108 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
109 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
110 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
111 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
112 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
113 { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */
114 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
115 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
116 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
117 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
118 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
119 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
120 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
121 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */
122 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
123 { USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */
124 { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */
125 { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */
126 { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */
127 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
128 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
129 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
130 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
131 { USB_DEVICE(0x10C4, 0x83AA) }, /* Mark-10 Digital Force Gauge */
132 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
133 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
134 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
135 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
136 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */
137 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
138 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
139 { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */
140 { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */
141 { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */
142 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
143 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
144 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
145 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
146 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
147 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
148 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
149 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
150 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
151 { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */
152 { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */
153 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
154 { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */
155 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
156 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
157 { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */
158 { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */
159 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
160 { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */
161 { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */
162 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
163 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
164 { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */
165 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
166 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
167 { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */
168 { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */
169 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
170 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
171 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
172 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
173 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
174 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
175 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
176 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
177 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
178 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
179 { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */
180 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
181 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
182 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
183 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
184 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
185 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
186 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
187 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
188 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
189 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
190 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
191 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
192 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
193 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
194 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
195 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
196 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
197 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
198 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
199 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
200 { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */
201 { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */
202 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
203 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
204 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
205 { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */
206 { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */
207 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
208 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
209 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
210 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
211 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
212 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
213 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
214 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
215 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
216 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
217 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
218 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
219 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
220 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
221 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
222 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
223 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
224 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
225 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
226 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
227 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
228 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
229 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
230 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
231 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
232 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
233 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
234 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
235 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
236 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
237 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
238 { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */
239 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
240 { } /* Terminating Entry */
241 };
242
243 MODULE_DEVICE_TABLE(usb, id_table);
244
245 struct cp210x_serial_private {
246 #ifdef CONFIG_GPIOLIB
247 struct gpio_chip gc;
248 u8 config;
249 u8 gpio_mode;
250 bool gpio_registered;
251 #endif
252 u8 partnum;
253 };
254
255 struct cp210x_port_private {
256 __u8 bInterfaceNumber;
257 bool has_swapped_line_ctl;
258 };
259
260 static struct usb_serial_driver cp210x_device = {
261 .driver = {
262 .owner = THIS_MODULE,
263 .name = "cp210x",
264 },
265 .id_table = id_table,
266 .num_ports = 1,
267 .bulk_in_size = 256,
268 .bulk_out_size = 256,
269 .open = cp210x_open,
270 .close = cp210x_close,
271 .break_ctl = cp210x_break_ctl,
272 .set_termios = cp210x_set_termios,
273 .tx_empty = cp210x_tx_empty,
274 .tiocmget = cp210x_tiocmget,
275 .tiocmset = cp210x_tiocmset,
276 .attach = cp210x_attach,
277 .disconnect = cp210x_disconnect,
278 .release = cp210x_release,
279 .port_probe = cp210x_port_probe,
280 .port_remove = cp210x_port_remove,
281 .dtr_rts = cp210x_dtr_rts
282 };
283
284 static struct usb_serial_driver * const serial_drivers[] = {
285 &cp210x_device, NULL
286 };
287
288 /* Config request types */
289 #define REQTYPE_HOST_TO_INTERFACE 0x41
290 #define REQTYPE_INTERFACE_TO_HOST 0xc1
291 #define REQTYPE_HOST_TO_DEVICE 0x40
292 #define REQTYPE_DEVICE_TO_HOST 0xc0
293
294 /* Config request codes */
295 #define CP210X_IFC_ENABLE 0x00
296 #define CP210X_SET_BAUDDIV 0x01
297 #define CP210X_GET_BAUDDIV 0x02
298 #define CP210X_SET_LINE_CTL 0x03
299 #define CP210X_GET_LINE_CTL 0x04
300 #define CP210X_SET_BREAK 0x05
301 #define CP210X_IMM_CHAR 0x06
302 #define CP210X_SET_MHS 0x07
303 #define CP210X_GET_MDMSTS 0x08
304 #define CP210X_SET_XON 0x09
305 #define CP210X_SET_XOFF 0x0A
306 #define CP210X_SET_EVENTMASK 0x0B
307 #define CP210X_GET_EVENTMASK 0x0C
308 #define CP210X_SET_CHAR 0x0D
309 #define CP210X_GET_CHARS 0x0E
310 #define CP210X_GET_PROPS 0x0F
311 #define CP210X_GET_COMM_STATUS 0x10
312 #define CP210X_RESET 0x11
313 #define CP210X_PURGE 0x12
314 #define CP210X_SET_FLOW 0x13
315 #define CP210X_GET_FLOW 0x14
316 #define CP210X_EMBED_EVENTS 0x15
317 #define CP210X_GET_EVENTSTATE 0x16
318 #define CP210X_SET_CHARS 0x19
319 #define CP210X_GET_BAUDRATE 0x1D
320 #define CP210X_SET_BAUDRATE 0x1E
321 #define CP210X_VENDOR_SPECIFIC 0xFF
322
323 /* CP210X_IFC_ENABLE */
324 #define UART_ENABLE 0x0001
325 #define UART_DISABLE 0x0000
326
327 /* CP210X_(SET|GET)_BAUDDIV */
328 #define BAUD_RATE_GEN_FREQ 0x384000
329
330 /* CP210X_(SET|GET)_LINE_CTL */
331 #define BITS_DATA_MASK 0X0f00
332 #define BITS_DATA_5 0X0500
333 #define BITS_DATA_6 0X0600
334 #define BITS_DATA_7 0X0700
335 #define BITS_DATA_8 0X0800
336 #define BITS_DATA_9 0X0900
337
338 #define BITS_PARITY_MASK 0x00f0
339 #define BITS_PARITY_NONE 0x0000
340 #define BITS_PARITY_ODD 0x0010
341 #define BITS_PARITY_EVEN 0x0020
342 #define BITS_PARITY_MARK 0x0030
343 #define BITS_PARITY_SPACE 0x0040
344
345 #define BITS_STOP_MASK 0x000f
346 #define BITS_STOP_1 0x0000
347 #define BITS_STOP_1_5 0x0001
348 #define BITS_STOP_2 0x0002
349
350 /* CP210X_SET_BREAK */
351 #define BREAK_ON 0x0001
352 #define BREAK_OFF 0x0000
353
354 /* CP210X_(SET_MHS|GET_MDMSTS) */
355 #define CONTROL_DTR 0x0001
356 #define CONTROL_RTS 0x0002
357 #define CONTROL_CTS 0x0010
358 #define CONTROL_DSR 0x0020
359 #define CONTROL_RING 0x0040
360 #define CONTROL_DCD 0x0080
361 #define CONTROL_WRITE_DTR 0x0100
362 #define CONTROL_WRITE_RTS 0x0200
363
364 /* CP210X_VENDOR_SPECIFIC values */
365 #define CP210X_READ_LATCH 0x00C2
366 #define CP210X_GET_PARTNUM 0x370B
367 #define CP210X_GET_PORTCONFIG 0x370C
368 #define CP210X_GET_DEVICEMODE 0x3711
369 #define CP210X_WRITE_LATCH 0x37E1
370
371 /* Part number definitions */
372 #define CP210X_PARTNUM_CP2101 0x01
373 #define CP210X_PARTNUM_CP2102 0x02
374 #define CP210X_PARTNUM_CP2103 0x03
375 #define CP210X_PARTNUM_CP2104 0x04
376 #define CP210X_PARTNUM_CP2105 0x05
377 #define CP210X_PARTNUM_CP2108 0x08
378 #define CP210X_PARTNUM_UNKNOWN 0xFF
379
380 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
381 struct cp210x_comm_status {
382 __le32 ulErrors;
383 __le32 ulHoldReasons;
384 __le32 ulAmountInInQueue;
385 __le32 ulAmountInOutQueue;
386 u8 bEofReceived;
387 u8 bWaitForImmediate;
388 u8 bReserved;
389 } __packed;
390
391 /*
392 * CP210X_PURGE - 16 bits passed in wValue of USB request.
393 * SiLabs app note AN571 gives a strange description of the 4 bits:
394 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
395 * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
396 */
397 #define PURGE_ALL 0x000f
398
399 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
400 struct cp210x_flow_ctl {
401 __le32 ulControlHandshake;
402 __le32 ulFlowReplace;
403 __le32 ulXonLimit;
404 __le32 ulXoffLimit;
405 } __packed;
406
407 /* cp210x_flow_ctl::ulControlHandshake */
408 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0)
409 #define CP210X_SERIAL_DTR_SHIFT(_mode) (_mode)
410 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3)
411 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4)
412 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5)
413 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6)
414
415 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */
416 #define CP210X_SERIAL_DTR_INACTIVE 0
417 #define CP210X_SERIAL_DTR_ACTIVE 1
418 #define CP210X_SERIAL_DTR_FLOW_CTL 2
419
420 /* cp210x_flow_ctl::ulFlowReplace */
421 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0)
422 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1)
423 #define CP210X_SERIAL_ERROR_CHAR BIT(2)
424 #define CP210X_SERIAL_NULL_STRIPPING BIT(3)
425 #define CP210X_SERIAL_BREAK_CHAR BIT(4)
426 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6)
427 #define CP210X_SERIAL_RTS_SHIFT(_mode) (_mode << 6)
428 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31)
429
430 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */
431 #define CP210X_SERIAL_RTS_INACTIVE 0
432 #define CP210X_SERIAL_RTS_ACTIVE 1
433 #define CP210X_SERIAL_RTS_FLOW_CTL 2
434
435 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
436 struct cp210x_pin_mode {
437 u8 eci;
438 u8 sci;
439 } __packed;
440
441 #define CP210X_PIN_MODE_MODEM 0
442 #define CP210X_PIN_MODE_GPIO BIT(0)
443
444 /*
445 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes.
446 * Structure needs padding due to unused/unspecified bytes.
447 */
448 struct cp210x_config {
449 __le16 gpio_mode;
450 u8 __pad0[2];
451 __le16 reset_state;
452 u8 __pad1[4];
453 __le16 suspend_state;
454 u8 sci_cfg;
455 u8 eci_cfg;
456 u8 device_cfg;
457 } __packed;
458
459 /* GPIO modes */
460 #define CP210X_SCI_GPIO_MODE_OFFSET 9
461 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9)
462
463 #define CP210X_ECI_GPIO_MODE_OFFSET 2
464 #define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2)
465
466 /* CP2105 port configuration values */
467 #define CP2105_GPIO0_TXLED_MODE BIT(0)
468 #define CP2105_GPIO1_RXLED_MODE BIT(1)
469 #define CP2105_GPIO1_RS485_MODE BIT(2)
470
471 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */
472 struct cp210x_gpio_write {
473 u8 mask;
474 u8 state;
475 } __packed;
476
477 /*
478 * Helper to get interface number when we only have struct usb_serial.
479 */
cp210x_interface_num(struct usb_serial * serial)480 static u8 cp210x_interface_num(struct usb_serial *serial)
481 {
482 struct usb_host_interface *cur_altsetting;
483
484 cur_altsetting = serial->interface->cur_altsetting;
485
486 return cur_altsetting->desc.bInterfaceNumber;
487 }
488
489 /*
490 * Reads a variable-sized block of CP210X_ registers, identified by req.
491 * Returns data into buf in native USB byte order.
492 */
cp210x_read_reg_block(struct usb_serial_port * port,u8 req,void * buf,int bufsize)493 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
494 void *buf, int bufsize)
495 {
496 struct usb_serial *serial = port->serial;
497 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
498 void *dmabuf;
499 int result;
500
501 dmabuf = kmalloc(bufsize, GFP_KERNEL);
502 if (!dmabuf) {
503 /*
504 * FIXME Some callers don't bother to check for error,
505 * at least give them consistent junk until they are fixed
506 */
507 memset(buf, 0, bufsize);
508 return -ENOMEM;
509 }
510
511 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
512 req, REQTYPE_INTERFACE_TO_HOST, 0,
513 port_priv->bInterfaceNumber, dmabuf, bufsize,
514 USB_CTRL_SET_TIMEOUT);
515 if (result == bufsize) {
516 memcpy(buf, dmabuf, bufsize);
517 result = 0;
518 } else {
519 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
520 req, bufsize, result);
521 if (result >= 0)
522 result = -EIO;
523
524 /*
525 * FIXME Some callers don't bother to check for error,
526 * at least give them consistent junk until they are fixed
527 */
528 memset(buf, 0, bufsize);
529 }
530
531 kfree(dmabuf);
532
533 return result;
534 }
535
536 /*
537 * Reads any 32-bit CP210X_ register identified by req.
538 */
cp210x_read_u32_reg(struct usb_serial_port * port,u8 req,u32 * val)539 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val)
540 {
541 __le32 le32_val;
542 int err;
543
544 err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val));
545 if (err) {
546 /*
547 * FIXME Some callers don't bother to check for error,
548 * at least give them consistent junk until they are fixed
549 */
550 *val = 0;
551 return err;
552 }
553
554 *val = le32_to_cpu(le32_val);
555
556 return 0;
557 }
558
559 /*
560 * Reads any 16-bit CP210X_ register identified by req.
561 */
cp210x_read_u16_reg(struct usb_serial_port * port,u8 req,u16 * val)562 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val)
563 {
564 __le16 le16_val;
565 int err;
566
567 err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val));
568 if (err)
569 return err;
570
571 *val = le16_to_cpu(le16_val);
572
573 return 0;
574 }
575
576 /*
577 * Reads any 8-bit CP210X_ register identified by req.
578 */
cp210x_read_u8_reg(struct usb_serial_port * port,u8 req,u8 * val)579 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
580 {
581 return cp210x_read_reg_block(port, req, val, sizeof(*val));
582 }
583
584 /*
585 * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
586 * Returns data into buf in native USB byte order.
587 */
cp210x_read_vendor_block(struct usb_serial * serial,u8 type,u16 val,void * buf,int bufsize)588 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
589 void *buf, int bufsize)
590 {
591 void *dmabuf;
592 int result;
593
594 dmabuf = kmalloc(bufsize, GFP_KERNEL);
595 if (!dmabuf)
596 return -ENOMEM;
597
598 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
599 CP210X_VENDOR_SPECIFIC, type, val,
600 cp210x_interface_num(serial), dmabuf, bufsize,
601 USB_CTRL_GET_TIMEOUT);
602 if (result == bufsize) {
603 memcpy(buf, dmabuf, bufsize);
604 result = 0;
605 } else {
606 dev_err(&serial->interface->dev,
607 "failed to get vendor val 0x%04x size %d: %d\n", val,
608 bufsize, result);
609 if (result >= 0)
610 result = -EIO;
611 }
612
613 kfree(dmabuf);
614
615 return result;
616 }
617
618 /*
619 * Writes any 16-bit CP210X_ register (req) whose value is passed
620 * entirely in the wValue field of the USB request.
621 */
cp210x_write_u16_reg(struct usb_serial_port * port,u8 req,u16 val)622 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
623 {
624 struct usb_serial *serial = port->serial;
625 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
626 int result;
627
628 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
629 req, REQTYPE_HOST_TO_INTERFACE, val,
630 port_priv->bInterfaceNumber, NULL, 0,
631 USB_CTRL_SET_TIMEOUT);
632 if (result < 0) {
633 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
634 req, result);
635 }
636
637 return result;
638 }
639
640 /*
641 * Writes a variable-sized block of CP210X_ registers, identified by req.
642 * Data in buf must be in native USB byte order.
643 */
cp210x_write_reg_block(struct usb_serial_port * port,u8 req,void * buf,int bufsize)644 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
645 void *buf, int bufsize)
646 {
647 struct usb_serial *serial = port->serial;
648 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
649 void *dmabuf;
650 int result;
651
652 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
653 if (!dmabuf)
654 return -ENOMEM;
655
656 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
657 req, REQTYPE_HOST_TO_INTERFACE, 0,
658 port_priv->bInterfaceNumber, dmabuf, bufsize,
659 USB_CTRL_SET_TIMEOUT);
660
661 kfree(dmabuf);
662
663 if (result == bufsize) {
664 result = 0;
665 } else {
666 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
667 req, bufsize, result);
668 if (result >= 0)
669 result = -EIO;
670 }
671
672 return result;
673 }
674
675 /*
676 * Writes any 32-bit CP210X_ register identified by req.
677 */
cp210x_write_u32_reg(struct usb_serial_port * port,u8 req,u32 val)678 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
679 {
680 __le32 le32_val;
681
682 le32_val = cpu_to_le32(val);
683
684 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
685 }
686
687 #ifdef CONFIG_GPIOLIB
688 /*
689 * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
690 * Data in buf must be in native USB byte order.
691 */
cp210x_write_vendor_block(struct usb_serial * serial,u8 type,u16 val,void * buf,int bufsize)692 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
693 u16 val, void *buf, int bufsize)
694 {
695 void *dmabuf;
696 int result;
697
698 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
699 if (!dmabuf)
700 return -ENOMEM;
701
702 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
703 CP210X_VENDOR_SPECIFIC, type, val,
704 cp210x_interface_num(serial), dmabuf, bufsize,
705 USB_CTRL_SET_TIMEOUT);
706
707 kfree(dmabuf);
708
709 if (result == bufsize) {
710 result = 0;
711 } else {
712 dev_err(&serial->interface->dev,
713 "failed to set vendor val 0x%04x size %d: %d\n", val,
714 bufsize, result);
715 if (result >= 0)
716 result = -EIO;
717 }
718
719 return result;
720 }
721 #endif
722
723 /*
724 * Detect CP2108 GET_LINE_CTL bug and activate workaround.
725 * Write a known good value 0x800, read it back.
726 * If it comes back swapped the bug is detected.
727 * Preserve the original register value.
728 */
cp210x_detect_swapped_line_ctl(struct usb_serial_port * port)729 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
730 {
731 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
732 u16 line_ctl_save;
733 u16 line_ctl_test;
734 int err;
735
736 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save);
737 if (err)
738 return err;
739
740 err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800);
741 if (err)
742 return err;
743
744 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test);
745 if (err)
746 return err;
747
748 if (line_ctl_test == 8) {
749 port_priv->has_swapped_line_ctl = true;
750 line_ctl_save = swab16(line_ctl_save);
751 }
752
753 return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save);
754 }
755
756 /*
757 * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL)
758 * to workaround cp2108 bug and get correct value.
759 */
cp210x_get_line_ctl(struct usb_serial_port * port,u16 * ctl)760 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl)
761 {
762 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
763 int err;
764
765 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl);
766 if (err)
767 return err;
768
769 /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
770 if (port_priv->has_swapped_line_ctl)
771 *ctl = swab16(*ctl);
772
773 return 0;
774 }
775
776 /*
777 * cp210x_quantise_baudrate
778 * Quantises the baud rate as per AN205 Table 1
779 */
cp210x_quantise_baudrate(unsigned int baud)780 static unsigned int cp210x_quantise_baudrate(unsigned int baud)
781 {
782 if (baud <= 300)
783 baud = 300;
784 else if (baud <= 600) baud = 600;
785 else if (baud <= 1200) baud = 1200;
786 else if (baud <= 1800) baud = 1800;
787 else if (baud <= 2400) baud = 2400;
788 else if (baud <= 4000) baud = 4000;
789 else if (baud <= 4803) baud = 4800;
790 else if (baud <= 7207) baud = 7200;
791 else if (baud <= 9612) baud = 9600;
792 else if (baud <= 14428) baud = 14400;
793 else if (baud <= 16062) baud = 16000;
794 else if (baud <= 19250) baud = 19200;
795 else if (baud <= 28912) baud = 28800;
796 else if (baud <= 38601) baud = 38400;
797 else if (baud <= 51558) baud = 51200;
798 else if (baud <= 56280) baud = 56000;
799 else if (baud <= 58053) baud = 57600;
800 else if (baud <= 64111) baud = 64000;
801 else if (baud <= 77608) baud = 76800;
802 else if (baud <= 117028) baud = 115200;
803 else if (baud <= 129347) baud = 128000;
804 else if (baud <= 156868) baud = 153600;
805 else if (baud <= 237832) baud = 230400;
806 else if (baud <= 254234) baud = 250000;
807 else if (baud <= 273066) baud = 256000;
808 else if (baud <= 491520) baud = 460800;
809 else if (baud <= 567138) baud = 500000;
810 else if (baud <= 670254) baud = 576000;
811 else if (baud < 1000000)
812 baud = 921600;
813 else if (baud > 2000000)
814 baud = 2000000;
815 return baud;
816 }
817
cp210x_open(struct tty_struct * tty,struct usb_serial_port * port)818 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
819 {
820 int result;
821
822 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
823 if (result) {
824 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
825 return result;
826 }
827
828 /* Configure the termios structure */
829 cp210x_get_termios(tty, port);
830
831 /* The baud rate must be initialised on cp2104 */
832 if (tty)
833 cp210x_change_speed(tty, port, NULL);
834
835 return usb_serial_generic_open(tty, port);
836 }
837
cp210x_close(struct usb_serial_port * port)838 static void cp210x_close(struct usb_serial_port *port)
839 {
840 usb_serial_generic_close(port);
841
842 /* Clear both queues; cp2108 needs this to avoid an occasional hang */
843 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
844
845 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
846 }
847
848 /*
849 * Read how many bytes are waiting in the TX queue.
850 */
cp210x_get_tx_queue_byte_count(struct usb_serial_port * port,u32 * count)851 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
852 u32 *count)
853 {
854 struct usb_serial *serial = port->serial;
855 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
856 struct cp210x_comm_status *sts;
857 int result;
858
859 sts = kmalloc(sizeof(*sts), GFP_KERNEL);
860 if (!sts)
861 return -ENOMEM;
862
863 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
864 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
865 0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
866 USB_CTRL_GET_TIMEOUT);
867 if (result == sizeof(*sts)) {
868 *count = le32_to_cpu(sts->ulAmountInOutQueue);
869 result = 0;
870 } else {
871 dev_err(&port->dev, "failed to get comm status: %d\n", result);
872 if (result >= 0)
873 result = -EIO;
874 }
875
876 kfree(sts);
877
878 return result;
879 }
880
cp210x_tx_empty(struct usb_serial_port * port)881 static bool cp210x_tx_empty(struct usb_serial_port *port)
882 {
883 int err;
884 u32 count;
885
886 err = cp210x_get_tx_queue_byte_count(port, &count);
887 if (err)
888 return true;
889
890 return !count;
891 }
892
893 /*
894 * cp210x_get_termios
895 * Reads the baud rate, data bits, parity, stop bits and flow control mode
896 * from the device, corrects any unsupported values, and configures the
897 * termios structure to reflect the state of the device
898 */
cp210x_get_termios(struct tty_struct * tty,struct usb_serial_port * port)899 static void cp210x_get_termios(struct tty_struct *tty,
900 struct usb_serial_port *port)
901 {
902 unsigned int baud;
903
904 if (tty) {
905 cp210x_get_termios_port(tty->driver_data,
906 &tty->termios.c_cflag, &baud);
907 tty_encode_baud_rate(tty, baud, baud);
908 } else {
909 tcflag_t cflag;
910 cflag = 0;
911 cp210x_get_termios_port(port, &cflag, &baud);
912 }
913 }
914
915 /*
916 * cp210x_get_termios_port
917 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
918 */
cp210x_get_termios_port(struct usb_serial_port * port,tcflag_t * cflagp,unsigned int * baudp)919 static void cp210x_get_termios_port(struct usb_serial_port *port,
920 tcflag_t *cflagp, unsigned int *baudp)
921 {
922 struct device *dev = &port->dev;
923 tcflag_t cflag;
924 struct cp210x_flow_ctl flow_ctl;
925 u32 baud;
926 u16 bits;
927 u32 ctl_hs;
928
929 cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud);
930
931 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
932 *baudp = baud;
933
934 cflag = *cflagp;
935
936 cp210x_get_line_ctl(port, &bits);
937 cflag &= ~CSIZE;
938 switch (bits & BITS_DATA_MASK) {
939 case BITS_DATA_5:
940 dev_dbg(dev, "%s - data bits = 5\n", __func__);
941 cflag |= CS5;
942 break;
943 case BITS_DATA_6:
944 dev_dbg(dev, "%s - data bits = 6\n", __func__);
945 cflag |= CS6;
946 break;
947 case BITS_DATA_7:
948 dev_dbg(dev, "%s - data bits = 7\n", __func__);
949 cflag |= CS7;
950 break;
951 case BITS_DATA_8:
952 dev_dbg(dev, "%s - data bits = 8\n", __func__);
953 cflag |= CS8;
954 break;
955 case BITS_DATA_9:
956 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\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 default:
963 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
964 cflag |= CS8;
965 bits &= ~BITS_DATA_MASK;
966 bits |= BITS_DATA_8;
967 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
968 break;
969 }
970
971 switch (bits & BITS_PARITY_MASK) {
972 case BITS_PARITY_NONE:
973 dev_dbg(dev, "%s - parity = NONE\n", __func__);
974 cflag &= ~PARENB;
975 break;
976 case BITS_PARITY_ODD:
977 dev_dbg(dev, "%s - parity = ODD\n", __func__);
978 cflag |= (PARENB|PARODD);
979 break;
980 case BITS_PARITY_EVEN:
981 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
982 cflag &= ~PARODD;
983 cflag |= PARENB;
984 break;
985 case BITS_PARITY_MARK:
986 dev_dbg(dev, "%s - parity = MARK\n", __func__);
987 cflag |= (PARENB|PARODD|CMSPAR);
988 break;
989 case BITS_PARITY_SPACE:
990 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
991 cflag &= ~PARODD;
992 cflag |= (PARENB|CMSPAR);
993 break;
994 default:
995 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
996 cflag &= ~PARENB;
997 bits &= ~BITS_PARITY_MASK;
998 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
999 break;
1000 }
1001
1002 cflag &= ~CSTOPB;
1003 switch (bits & BITS_STOP_MASK) {
1004 case BITS_STOP_1:
1005 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
1006 break;
1007 case BITS_STOP_1_5:
1008 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
1009 bits &= ~BITS_STOP_MASK;
1010 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1011 break;
1012 case BITS_STOP_2:
1013 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1014 cflag |= CSTOPB;
1015 break;
1016 default:
1017 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
1018 bits &= ~BITS_STOP_MASK;
1019 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1020 break;
1021 }
1022
1023 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1024 sizeof(flow_ctl));
1025 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1026 if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) {
1027 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1028 cflag |= CRTSCTS;
1029 } else {
1030 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1031 cflag &= ~CRTSCTS;
1032 }
1033
1034 *cflagp = cflag;
1035 }
1036
1037 /*
1038 * CP2101 supports the following baud rates:
1039 *
1040 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
1041 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
1042 *
1043 * CP2102 and CP2103 support the following additional rates:
1044 *
1045 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
1046 * 576000
1047 *
1048 * The device will map a requested rate to a supported one, but the result
1049 * of requests for rates greater than 1053257 is undefined (see AN205).
1050 *
1051 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
1052 * respectively, with an error less than 1%. The actual rates are determined
1053 * by
1054 *
1055 * div = round(freq / (2 x prescale x request))
1056 * actual = freq / (2 x prescale x div)
1057 *
1058 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1059 * or 1 otherwise.
1060 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1061 * otherwise.
1062 */
cp210x_change_speed(struct tty_struct * tty,struct usb_serial_port * port,struct ktermios * old_termios)1063 static void cp210x_change_speed(struct tty_struct *tty,
1064 struct usb_serial_port *port, struct ktermios *old_termios)
1065 {
1066 u32 baud;
1067
1068 baud = tty->termios.c_ospeed;
1069
1070 /* This maps the requested rate to a rate valid on cp2102 or cp2103,
1071 * or to an arbitrary rate in [1M,2M].
1072 *
1073 * NOTE: B0 is not implemented.
1074 */
1075 baud = cp210x_quantise_baudrate(baud);
1076
1077 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1078 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1079 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1080 if (old_termios)
1081 baud = old_termios->c_ospeed;
1082 else
1083 baud = 9600;
1084 }
1085
1086 tty_encode_baud_rate(tty, baud, baud);
1087 }
1088
cp210x_set_termios(struct tty_struct * tty,struct usb_serial_port * port,struct ktermios * old_termios)1089 static void cp210x_set_termios(struct tty_struct *tty,
1090 struct usb_serial_port *port, struct ktermios *old_termios)
1091 {
1092 struct device *dev = &port->dev;
1093 unsigned int cflag, old_cflag;
1094 u16 bits;
1095
1096 cflag = tty->termios.c_cflag;
1097 old_cflag = old_termios->c_cflag;
1098
1099 if (tty->termios.c_ospeed != old_termios->c_ospeed)
1100 cp210x_change_speed(tty, port, old_termios);
1101
1102 /* If the number of data bits is to be updated */
1103 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
1104 cp210x_get_line_ctl(port, &bits);
1105 bits &= ~BITS_DATA_MASK;
1106 switch (cflag & CSIZE) {
1107 case CS5:
1108 bits |= BITS_DATA_5;
1109 dev_dbg(dev, "%s - data bits = 5\n", __func__);
1110 break;
1111 case CS6:
1112 bits |= BITS_DATA_6;
1113 dev_dbg(dev, "%s - data bits = 6\n", __func__);
1114 break;
1115 case CS7:
1116 bits |= BITS_DATA_7;
1117 dev_dbg(dev, "%s - data bits = 7\n", __func__);
1118 break;
1119 case CS8:
1120 default:
1121 bits |= BITS_DATA_8;
1122 dev_dbg(dev, "%s - data bits = 8\n", __func__);
1123 break;
1124 }
1125 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1126 dev_dbg(dev, "Number of data bits requested not supported by device\n");
1127 }
1128
1129 if ((cflag & (PARENB|PARODD|CMSPAR)) !=
1130 (old_cflag & (PARENB|PARODD|CMSPAR))) {
1131 cp210x_get_line_ctl(port, &bits);
1132 bits &= ~BITS_PARITY_MASK;
1133 if (cflag & PARENB) {
1134 if (cflag & CMSPAR) {
1135 if (cflag & PARODD) {
1136 bits |= BITS_PARITY_MARK;
1137 dev_dbg(dev, "%s - parity = MARK\n", __func__);
1138 } else {
1139 bits |= BITS_PARITY_SPACE;
1140 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
1141 }
1142 } else {
1143 if (cflag & PARODD) {
1144 bits |= BITS_PARITY_ODD;
1145 dev_dbg(dev, "%s - parity = ODD\n", __func__);
1146 } else {
1147 bits |= BITS_PARITY_EVEN;
1148 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
1149 }
1150 }
1151 }
1152 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1153 dev_dbg(dev, "Parity mode not supported by device\n");
1154 }
1155
1156 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
1157 cp210x_get_line_ctl(port, &bits);
1158 bits &= ~BITS_STOP_MASK;
1159 if (cflag & CSTOPB) {
1160 bits |= BITS_STOP_2;
1161 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1162 } else {
1163 bits |= BITS_STOP_1;
1164 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
1165 }
1166 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1167 dev_dbg(dev, "Number of stop bits requested not supported by device\n");
1168 }
1169
1170 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
1171 struct cp210x_flow_ctl flow_ctl;
1172 u32 ctl_hs;
1173 u32 flow_repl;
1174
1175 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1176 sizeof(flow_ctl));
1177 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1178 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1179 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1180 __func__, ctl_hs, flow_repl);
1181
1182 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1183 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1184 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1185 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1186 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE);
1187 if (cflag & CRTSCTS) {
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_FLOW_CTL);
1193 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1194 } else {
1195 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1196
1197 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1198 flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1199 CP210X_SERIAL_RTS_ACTIVE);
1200 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1201 }
1202
1203 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1204 __func__, ctl_hs, flow_repl);
1205 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1206 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1207 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1208 sizeof(flow_ctl));
1209 }
1210
1211 }
1212
cp210x_tiocmset(struct tty_struct * tty,unsigned int set,unsigned int clear)1213 static int cp210x_tiocmset(struct tty_struct *tty,
1214 unsigned int set, unsigned int clear)
1215 {
1216 struct usb_serial_port *port = tty->driver_data;
1217 return cp210x_tiocmset_port(port, set, clear);
1218 }
1219
cp210x_tiocmset_port(struct usb_serial_port * port,unsigned int set,unsigned int clear)1220 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1221 unsigned int set, unsigned int clear)
1222 {
1223 u16 control = 0;
1224
1225 if (set & TIOCM_RTS) {
1226 control |= CONTROL_RTS;
1227 control |= CONTROL_WRITE_RTS;
1228 }
1229 if (set & TIOCM_DTR) {
1230 control |= CONTROL_DTR;
1231 control |= CONTROL_WRITE_DTR;
1232 }
1233 if (clear & TIOCM_RTS) {
1234 control &= ~CONTROL_RTS;
1235 control |= CONTROL_WRITE_RTS;
1236 }
1237 if (clear & TIOCM_DTR) {
1238 control &= ~CONTROL_DTR;
1239 control |= CONTROL_WRITE_DTR;
1240 }
1241
1242 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
1243
1244 return cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1245 }
1246
cp210x_dtr_rts(struct usb_serial_port * p,int on)1247 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
1248 {
1249 if (on)
1250 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
1251 else
1252 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
1253 }
1254
cp210x_tiocmget(struct tty_struct * tty)1255 static int cp210x_tiocmget(struct tty_struct *tty)
1256 {
1257 struct usb_serial_port *port = tty->driver_data;
1258 u8 control;
1259 int result;
1260
1261 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1262 if (result)
1263 return result;
1264
1265 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1266 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1267 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1268 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1269 |((control & CONTROL_RING)? TIOCM_RI : 0)
1270 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
1271
1272 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
1273
1274 return result;
1275 }
1276
cp210x_break_ctl(struct tty_struct * tty,int break_state)1277 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1278 {
1279 struct usb_serial_port *port = tty->driver_data;
1280 u16 state;
1281
1282 if (break_state == 0)
1283 state = BREAK_OFF;
1284 else
1285 state = BREAK_ON;
1286 dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1287 state == BREAK_OFF ? "off" : "on");
1288 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1289 }
1290
1291 #ifdef CONFIG_GPIOLIB
cp210x_gpio_request(struct gpio_chip * gc,unsigned int offset)1292 static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset)
1293 {
1294 struct usb_serial *serial = gpiochip_get_data(gc);
1295 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1296
1297 switch (offset) {
1298 case 0:
1299 if (priv->config & CP2105_GPIO0_TXLED_MODE)
1300 return -ENODEV;
1301 break;
1302 case 1:
1303 if (priv->config & (CP2105_GPIO1_RXLED_MODE |
1304 CP2105_GPIO1_RS485_MODE))
1305 return -ENODEV;
1306 break;
1307 }
1308
1309 return 0;
1310 }
1311
cp210x_gpio_get(struct gpio_chip * gc,unsigned int gpio)1312 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1313 {
1314 struct usb_serial *serial = gpiochip_get_data(gc);
1315 int result;
1316 u8 buf;
1317
1318 result = cp210x_read_vendor_block(serial, REQTYPE_INTERFACE_TO_HOST,
1319 CP210X_READ_LATCH, &buf, sizeof(buf));
1320 if (result < 0)
1321 return result;
1322
1323 return !!(buf & BIT(gpio));
1324 }
1325
cp210x_gpio_set(struct gpio_chip * gc,unsigned int gpio,int value)1326 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1327 {
1328 struct usb_serial *serial = gpiochip_get_data(gc);
1329 struct cp210x_gpio_write buf;
1330
1331 if (value == 1)
1332 buf.state = BIT(gpio);
1333 else
1334 buf.state = 0;
1335
1336 buf.mask = BIT(gpio);
1337
1338 cp210x_write_vendor_block(serial, REQTYPE_HOST_TO_INTERFACE,
1339 CP210X_WRITE_LATCH, &buf, sizeof(buf));
1340 }
1341
cp210x_gpio_direction_get(struct gpio_chip * gc,unsigned int gpio)1342 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1343 {
1344 /* Hardware does not support an input mode */
1345 return 0;
1346 }
1347
cp210x_gpio_direction_input(struct gpio_chip * gc,unsigned int gpio)1348 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
1349 {
1350 /* Hardware does not support an input mode */
1351 return -ENOTSUPP;
1352 }
1353
cp210x_gpio_direction_output(struct gpio_chip * gc,unsigned int gpio,int value)1354 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1355 int value)
1356 {
1357 return 0;
1358 }
1359
cp210x_gpio_set_config(struct gpio_chip * gc,unsigned int gpio,unsigned long config)1360 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
1361 unsigned long config)
1362 {
1363 struct usb_serial *serial = gpiochip_get_data(gc);
1364 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1365 enum pin_config_param param = pinconf_to_config_param(config);
1366
1367 /* Succeed only if in correct mode (this can't be set at runtime) */
1368 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) &&
1369 (priv->gpio_mode & BIT(gpio)))
1370 return 0;
1371
1372 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) &&
1373 !(priv->gpio_mode & BIT(gpio)))
1374 return 0;
1375
1376 return -ENOTSUPP;
1377 }
1378
1379 /*
1380 * This function is for configuring GPIO using shared pins, where other signals
1381 * are made unavailable by configuring the use of GPIO. This is believed to be
1382 * only applicable to the cp2105 at this point, the other devices supported by
1383 * this driver that provide GPIO do so in a way that does not impact other
1384 * signals and are thus expected to have very different initialisation.
1385 */
cp2105_shared_gpio_init(struct usb_serial * serial)1386 static int cp2105_shared_gpio_init(struct usb_serial *serial)
1387 {
1388 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1389 struct cp210x_pin_mode mode;
1390 struct cp210x_config config;
1391 u8 intf_num = cp210x_interface_num(serial);
1392 int result;
1393
1394 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1395 CP210X_GET_DEVICEMODE, &mode,
1396 sizeof(mode));
1397 if (result < 0)
1398 return result;
1399
1400 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1401 CP210X_GET_PORTCONFIG, &config,
1402 sizeof(config));
1403 if (result < 0)
1404 return result;
1405
1406 /* 2 banks of GPIO - One for the pins taken from each serial port */
1407 if (intf_num == 0) {
1408 if (mode.eci == CP210X_PIN_MODE_MODEM)
1409 return 0;
1410
1411 priv->config = config.eci_cfg;
1412 priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) &
1413 CP210X_ECI_GPIO_MODE_MASK) >>
1414 CP210X_ECI_GPIO_MODE_OFFSET);
1415 priv->gc.ngpio = 2;
1416 } else if (intf_num == 1) {
1417 if (mode.sci == CP210X_PIN_MODE_MODEM)
1418 return 0;
1419
1420 priv->config = config.sci_cfg;
1421 priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) &
1422 CP210X_SCI_GPIO_MODE_MASK) >>
1423 CP210X_SCI_GPIO_MODE_OFFSET);
1424 priv->gc.ngpio = 3;
1425 } else {
1426 return -ENODEV;
1427 }
1428
1429 priv->gc.label = "cp210x";
1430 priv->gc.request = cp210x_gpio_request;
1431 priv->gc.get_direction = cp210x_gpio_direction_get;
1432 priv->gc.direction_input = cp210x_gpio_direction_input;
1433 priv->gc.direction_output = cp210x_gpio_direction_output;
1434 priv->gc.get = cp210x_gpio_get;
1435 priv->gc.set = cp210x_gpio_set;
1436 priv->gc.set_config = cp210x_gpio_set_config;
1437 priv->gc.owner = THIS_MODULE;
1438 priv->gc.parent = &serial->interface->dev;
1439 priv->gc.base = -1;
1440 priv->gc.can_sleep = true;
1441
1442 result = gpiochip_add_data(&priv->gc, serial);
1443 if (!result)
1444 priv->gpio_registered = true;
1445
1446 return result;
1447 }
1448
cp210x_gpio_remove(struct usb_serial * serial)1449 static void cp210x_gpio_remove(struct usb_serial *serial)
1450 {
1451 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1452
1453 if (priv->gpio_registered) {
1454 gpiochip_remove(&priv->gc);
1455 priv->gpio_registered = false;
1456 }
1457 }
1458
1459 #else
1460
cp2105_shared_gpio_init(struct usb_serial * serial)1461 static int cp2105_shared_gpio_init(struct usb_serial *serial)
1462 {
1463 return 0;
1464 }
1465
cp210x_gpio_remove(struct usb_serial * serial)1466 static void cp210x_gpio_remove(struct usb_serial *serial)
1467 {
1468 /* Nothing to do */
1469 }
1470
1471 #endif
1472
cp210x_port_probe(struct usb_serial_port * port)1473 static int cp210x_port_probe(struct usb_serial_port *port)
1474 {
1475 struct usb_serial *serial = port->serial;
1476 struct cp210x_port_private *port_priv;
1477 int ret;
1478
1479 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1480 if (!port_priv)
1481 return -ENOMEM;
1482
1483 port_priv->bInterfaceNumber = cp210x_interface_num(serial);
1484
1485 usb_set_serial_port_data(port, port_priv);
1486
1487 ret = cp210x_detect_swapped_line_ctl(port);
1488 if (ret) {
1489 kfree(port_priv);
1490 return ret;
1491 }
1492
1493 return 0;
1494 }
1495
cp210x_port_remove(struct usb_serial_port * port)1496 static int cp210x_port_remove(struct usb_serial_port *port)
1497 {
1498 struct cp210x_port_private *port_priv;
1499
1500 port_priv = usb_get_serial_port_data(port);
1501 kfree(port_priv);
1502
1503 return 0;
1504 }
1505
cp210x_attach(struct usb_serial * serial)1506 static int cp210x_attach(struct usb_serial *serial)
1507 {
1508 int result;
1509 struct cp210x_serial_private *priv;
1510
1511 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1512 if (!priv)
1513 return -ENOMEM;
1514
1515 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1516 CP210X_GET_PARTNUM, &priv->partnum,
1517 sizeof(priv->partnum));
1518 if (result < 0) {
1519 dev_warn(&serial->interface->dev,
1520 "querying part number failed\n");
1521 priv->partnum = CP210X_PARTNUM_UNKNOWN;
1522 }
1523
1524 usb_set_serial_data(serial, priv);
1525
1526 if (priv->partnum == CP210X_PARTNUM_CP2105) {
1527 result = cp2105_shared_gpio_init(serial);
1528 if (result < 0) {
1529 dev_err(&serial->interface->dev,
1530 "GPIO initialisation failed, continuing without GPIO support\n");
1531 }
1532 }
1533
1534 return 0;
1535 }
1536
cp210x_disconnect(struct usb_serial * serial)1537 static void cp210x_disconnect(struct usb_serial *serial)
1538 {
1539 cp210x_gpio_remove(serial);
1540 }
1541
cp210x_release(struct usb_serial * serial)1542 static void cp210x_release(struct usb_serial *serial)
1543 {
1544 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1545
1546 cp210x_gpio_remove(serial);
1547
1548 kfree(priv);
1549 }
1550
1551 module_usb_serial_driver(serial_drivers, id_table);
1552
1553 MODULE_DESCRIPTION(DRIVER_DESC);
1554 MODULE_LICENSE("GPL");
1555