1 // SPDX-License-Identifier: GPL-2.0
3 * Silicon Laboratories CP210x USB to RS232 serial adaptor driver
5 * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
6 * Copyright (C) 2010-2021 Johan Hovold (johan@kernel.org)
8 * Support to set flow control line levels using TIOCMGET and TIOCMSET
9 * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow
10 * control thanks to Munir Nassar nassarmu@real-time.com
14 #include <linux/kernel.h>
15 #include <linux/errno.h>
16 #include <linux/slab.h>
17 #include <linux/tty.h>
18 #include <linux/tty_flip.h>
19 #include <linux/module.h>
20 #include <linux/usb.h>
21 #include <linux/usb/serial.h>
22 #include <linux/gpio/driver.h>
23 #include <linux/bitops.h>
24 #include <linux/mutex.h>
26 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
31 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
32 static void cp210x_close(struct usb_serial_port *);
33 static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *,
35 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
37 static bool cp210x_tx_empty(struct usb_serial_port *port);
38 static int cp210x_tiocmget(struct tty_struct *);
39 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
40 static int cp210x_tiocmset_port(struct usb_serial_port *port,
41 unsigned int, unsigned int);
42 static void cp210x_break_ctl(struct tty_struct *, int);
43 static int cp210x_attach(struct usb_serial *);
44 static void cp210x_disconnect(struct usb_serial *);
45 static void cp210x_release(struct usb_serial *);
46 static int cp210x_port_probe(struct usb_serial_port *);
47 static void cp210x_port_remove(struct usb_serial_port *);
48 static void cp210x_dtr_rts(struct usb_serial_port *port, int on);
49 static void cp210x_process_read_urb(struct urb *urb);
50 static void cp210x_enable_event_mode(struct usb_serial_port *port);
51 static void cp210x_disable_event_mode(struct usb_serial_port *port);
53 static const struct usb_device_id id_table[] = {
54 { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */
55 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
56 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
57 { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
58 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
59 { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */
60 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
61 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
62 { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */
63 { USB_DEVICE(0x0988, 0x0578) }, /* Teraoka AD2000 */
64 { USB_DEVICE(0x0B00, 0x3070) }, /* Ingenico 3070 */
65 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
66 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
67 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
68 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
69 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
70 { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */
71 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
72 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
73 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
74 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
75 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
76 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
77 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
78 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
79 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
80 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
81 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
82 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
83 { USB_DEVICE(0x10C4, 0x8056) }, /* Lorenz Messtechnik devices */
84 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
85 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
86 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
87 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
88 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
89 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
90 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
91 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
92 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
93 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
94 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
95 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
96 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
97 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
98 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
99 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
100 { USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */
101 { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */
102 { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */
103 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
104 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
105 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
106 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
107 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
108 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
109 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
110 { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */
111 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
112 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
113 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
114 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
115 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
116 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
117 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
118 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */
119 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
120 { USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */
121 { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */
122 { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */
123 { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */
124 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
125 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
126 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
127 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
128 { USB_DEVICE(0x10C4, 0x83AA) }, /* Mark-10 Digital Force Gauge */
129 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
130 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
131 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
132 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
133 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */
134 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
135 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
136 { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */
137 { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */
138 { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */
139 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
140 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
141 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
142 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
143 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
144 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
145 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
146 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
147 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
148 { USB_DEVICE(0x10C4, 0x88D8) }, /* Acuity Brands nLight Air Adapter */
149 { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */
150 { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */
151 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
152 { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */
153 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
154 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
155 { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */
156 { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */
157 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
158 { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */
159 { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */
160 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
161 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
162 { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */
163 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
164 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
165 { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */
166 { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */
167 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
168 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
169 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
170 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
171 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
172 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
173 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
174 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
175 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
176 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
177 { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */
178 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
179 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
180 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
181 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
182 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
183 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
184 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
185 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
186 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
187 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
188 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
189 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
190 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
191 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
192 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
193 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
194 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
195 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
196 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
197 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
198 { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */
199 { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */
200 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
201 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
202 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
203 { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */
204 { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */
205 { USB_DEVICE(0x1901, 0x0197) }, /* GE CS1000 Display serial interface */
206 { USB_DEVICE(0x1901, 0x0198) }, /* GE CS1000 M.2 Key E serial interface */
207 { USB_DEVICE(0x199B, 0xBA30) }, /* LORD WSDA-200-USB */
208 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
209 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
210 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
211 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
212 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
213 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
214 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
215 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
216 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
217 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
218 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
219 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
220 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
221 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
222 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
223 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
224 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
225 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
226 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
227 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
228 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
229 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
230 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
231 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
232 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
233 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
234 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
235 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
236 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
237 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
238 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
239 { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */
240 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
241 { } /* Terminating Entry */
244 MODULE_DEVICE_TABLE(usb, id_table);
246 struct cp210x_serial_private {
247 #ifdef CONFIG_GPIOLIB
249 bool gpio_registered;
257 bool use_actual_rate;
260 enum cp210x_event_state {
269 struct cp210x_port_private {
272 enum cp210x_event_state event_state;
281 static struct usb_serial_driver cp210x_device = {
283 .owner = THIS_MODULE,
286 .id_table = id_table,
289 .bulk_out_size = 256,
291 .close = cp210x_close,
292 .break_ctl = cp210x_break_ctl,
293 .set_termios = cp210x_set_termios,
294 .tx_empty = cp210x_tx_empty,
295 .throttle = usb_serial_generic_throttle,
296 .unthrottle = usb_serial_generic_unthrottle,
297 .tiocmget = cp210x_tiocmget,
298 .tiocmset = cp210x_tiocmset,
299 .get_icount = usb_serial_generic_get_icount,
300 .attach = cp210x_attach,
301 .disconnect = cp210x_disconnect,
302 .release = cp210x_release,
303 .port_probe = cp210x_port_probe,
304 .port_remove = cp210x_port_remove,
305 .dtr_rts = cp210x_dtr_rts,
306 .process_read_urb = cp210x_process_read_urb,
309 static struct usb_serial_driver * const serial_drivers[] = {
313 /* Config request types */
314 #define REQTYPE_HOST_TO_INTERFACE 0x41
315 #define REQTYPE_INTERFACE_TO_HOST 0xc1
316 #define REQTYPE_HOST_TO_DEVICE 0x40
317 #define REQTYPE_DEVICE_TO_HOST 0xc0
319 /* Config request codes */
320 #define CP210X_IFC_ENABLE 0x00
321 #define CP210X_SET_BAUDDIV 0x01
322 #define CP210X_GET_BAUDDIV 0x02
323 #define CP210X_SET_LINE_CTL 0x03
324 #define CP210X_GET_LINE_CTL 0x04
325 #define CP210X_SET_BREAK 0x05
326 #define CP210X_IMM_CHAR 0x06
327 #define CP210X_SET_MHS 0x07
328 #define CP210X_GET_MDMSTS 0x08
329 #define CP210X_SET_XON 0x09
330 #define CP210X_SET_XOFF 0x0A
331 #define CP210X_SET_EVENTMASK 0x0B
332 #define CP210X_GET_EVENTMASK 0x0C
333 #define CP210X_SET_CHAR 0x0D
334 #define CP210X_GET_CHARS 0x0E
335 #define CP210X_GET_PROPS 0x0F
336 #define CP210X_GET_COMM_STATUS 0x10
337 #define CP210X_RESET 0x11
338 #define CP210X_PURGE 0x12
339 #define CP210X_SET_FLOW 0x13
340 #define CP210X_GET_FLOW 0x14
341 #define CP210X_EMBED_EVENTS 0x15
342 #define CP210X_GET_EVENTSTATE 0x16
343 #define CP210X_SET_CHARS 0x19
344 #define CP210X_GET_BAUDRATE 0x1D
345 #define CP210X_SET_BAUDRATE 0x1E
346 #define CP210X_VENDOR_SPECIFIC 0xFF
348 /* CP210X_IFC_ENABLE */
349 #define UART_ENABLE 0x0001
350 #define UART_DISABLE 0x0000
352 /* CP210X_(SET|GET)_BAUDDIV */
353 #define BAUD_RATE_GEN_FREQ 0x384000
355 /* CP210X_(SET|GET)_LINE_CTL */
356 #define BITS_DATA_MASK 0X0f00
357 #define BITS_DATA_5 0X0500
358 #define BITS_DATA_6 0X0600
359 #define BITS_DATA_7 0X0700
360 #define BITS_DATA_8 0X0800
361 #define BITS_DATA_9 0X0900
363 #define BITS_PARITY_MASK 0x00f0
364 #define BITS_PARITY_NONE 0x0000
365 #define BITS_PARITY_ODD 0x0010
366 #define BITS_PARITY_EVEN 0x0020
367 #define BITS_PARITY_MARK 0x0030
368 #define BITS_PARITY_SPACE 0x0040
370 #define BITS_STOP_MASK 0x000f
371 #define BITS_STOP_1 0x0000
372 #define BITS_STOP_1_5 0x0001
373 #define BITS_STOP_2 0x0002
375 /* CP210X_SET_BREAK */
376 #define BREAK_ON 0x0001
377 #define BREAK_OFF 0x0000
379 /* CP210X_(SET_MHS|GET_MDMSTS) */
380 #define CONTROL_DTR 0x0001
381 #define CONTROL_RTS 0x0002
382 #define CONTROL_CTS 0x0010
383 #define CONTROL_DSR 0x0020
384 #define CONTROL_RING 0x0040
385 #define CONTROL_DCD 0x0080
386 #define CONTROL_WRITE_DTR 0x0100
387 #define CONTROL_WRITE_RTS 0x0200
389 /* CP210X_(GET|SET)_CHARS */
390 struct cp210x_special_chars {
399 /* CP210X_VENDOR_SPECIFIC values */
400 #define CP210X_READ_2NCONFIG 0x000E
401 #define CP210X_READ_LATCH 0x00C2
402 #define CP210X_GET_PARTNUM 0x370B
403 #define CP210X_GET_PORTCONFIG 0x370C
404 #define CP210X_GET_DEVICEMODE 0x3711
405 #define CP210X_WRITE_LATCH 0x37E1
407 /* Part number definitions */
408 #define CP210X_PARTNUM_CP2101 0x01
409 #define CP210X_PARTNUM_CP2102 0x02
410 #define CP210X_PARTNUM_CP2103 0x03
411 #define CP210X_PARTNUM_CP2104 0x04
412 #define CP210X_PARTNUM_CP2105 0x05
413 #define CP210X_PARTNUM_CP2108 0x08
414 #define CP210X_PARTNUM_CP2102N_QFN28 0x20
415 #define CP210X_PARTNUM_CP2102N_QFN24 0x21
416 #define CP210X_PARTNUM_CP2102N_QFN20 0x22
417 #define CP210X_PARTNUM_UNKNOWN 0xFF
419 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
420 struct cp210x_comm_status {
422 __le32 ulHoldReasons;
423 __le32 ulAmountInInQueue;
424 __le32 ulAmountInOutQueue;
426 u8 bWaitForImmediate;
431 * CP210X_PURGE - 16 bits passed in wValue of USB request.
432 * SiLabs app note AN571 gives a strange description of the 4 bits:
433 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
434 * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
436 #define PURGE_ALL 0x000f
438 /* CP210X_EMBED_EVENTS */
439 #define CP210X_ESCCHAR 0xec
441 #define CP210X_LSR_OVERRUN BIT(1)
442 #define CP210X_LSR_PARITY BIT(2)
443 #define CP210X_LSR_FRAME BIT(3)
444 #define CP210X_LSR_BREAK BIT(4)
447 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
448 struct cp210x_flow_ctl {
449 __le32 ulControlHandshake;
450 __le32 ulFlowReplace;
455 /* cp210x_flow_ctl::ulControlHandshake */
456 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0)
457 #define CP210X_SERIAL_DTR_INACTIVE (0 << 0)
458 #define CP210X_SERIAL_DTR_ACTIVE (1 << 0)
459 #define CP210X_SERIAL_DTR_FLOW_CTL (2 << 0)
460 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3)
461 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4)
462 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5)
463 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6)
465 /* cp210x_flow_ctl::ulFlowReplace */
466 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0)
467 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1)
468 #define CP210X_SERIAL_ERROR_CHAR BIT(2)
469 #define CP210X_SERIAL_NULL_STRIPPING BIT(3)
470 #define CP210X_SERIAL_BREAK_CHAR BIT(4)
471 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6)
472 #define CP210X_SERIAL_RTS_INACTIVE (0 << 6)
473 #define CP210X_SERIAL_RTS_ACTIVE (1 << 6)
474 #define CP210X_SERIAL_RTS_FLOW_CTL (2 << 6)
475 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31)
477 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
478 struct cp210x_pin_mode {
483 #define CP210X_PIN_MODE_MODEM 0
484 #define CP210X_PIN_MODE_GPIO BIT(0)
487 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes
488 * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes.
490 struct cp210x_dual_port_config {
495 __le16 suspend_state;
502 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes
503 * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes.
505 struct cp210x_single_port_config {
510 __le16 suspend_state;
515 #define CP210X_SCI_GPIO_MODE_OFFSET 9
516 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9)
518 #define CP210X_ECI_GPIO_MODE_OFFSET 2
519 #define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2)
521 #define CP210X_GPIO_MODE_OFFSET 8
522 #define CP210X_GPIO_MODE_MASK GENMASK(11, 8)
524 /* CP2105 port configuration values */
525 #define CP2105_GPIO0_TXLED_MODE BIT(0)
526 #define CP2105_GPIO1_RXLED_MODE BIT(1)
527 #define CP2105_GPIO1_RS485_MODE BIT(2)
529 /* CP2104 port configuration values */
530 #define CP2104_GPIO0_TXLED_MODE BIT(0)
531 #define CP2104_GPIO1_RXLED_MODE BIT(1)
532 #define CP2104_GPIO2_RS485_MODE BIT(2)
534 /* CP2102N configuration array indices */
535 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX 2
536 #define CP210X_2NCONFIG_GPIO_MODE_IDX 581
537 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587
538 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600
540 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */
541 struct cp210x_gpio_write {
547 * Helper to get interface number when we only have struct usb_serial.
549 static u8 cp210x_interface_num(struct usb_serial *serial)
551 struct usb_host_interface *cur_altsetting;
553 cur_altsetting = serial->interface->cur_altsetting;
555 return cur_altsetting->desc.bInterfaceNumber;
559 * Reads a variable-sized block of CP210X_ registers, identified by req.
560 * Returns data into buf in native USB byte order.
562 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
563 void *buf, int bufsize)
565 struct usb_serial *serial = port->serial;
566 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
570 dmabuf = kmalloc(bufsize, GFP_KERNEL);
574 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
575 req, REQTYPE_INTERFACE_TO_HOST, 0,
576 port_priv->bInterfaceNumber, dmabuf, bufsize,
577 USB_CTRL_SET_TIMEOUT);
578 if (result == bufsize) {
579 memcpy(buf, dmabuf, bufsize);
582 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
583 req, bufsize, result);
594 * Reads any 8-bit CP210X_ register identified by req.
596 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
598 return cp210x_read_reg_block(port, req, val, sizeof(*val));
602 * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
603 * Returns data into buf in native USB byte order.
605 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
606 void *buf, int bufsize)
611 dmabuf = kmalloc(bufsize, GFP_KERNEL);
615 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
616 CP210X_VENDOR_SPECIFIC, type, val,
617 cp210x_interface_num(serial), dmabuf, bufsize,
618 USB_CTRL_GET_TIMEOUT);
619 if (result == bufsize) {
620 memcpy(buf, dmabuf, bufsize);
623 dev_err(&serial->interface->dev,
624 "failed to get vendor val 0x%04x size %d: %d\n", val,
636 * Writes any 16-bit CP210X_ register (req) whose value is passed
637 * entirely in the wValue field of the USB request.
639 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
641 struct usb_serial *serial = port->serial;
642 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
645 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
646 req, REQTYPE_HOST_TO_INTERFACE, val,
647 port_priv->bInterfaceNumber, NULL, 0,
648 USB_CTRL_SET_TIMEOUT);
650 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
658 * Writes a variable-sized block of CP210X_ registers, identified by req.
659 * Data in buf must be in native USB byte order.
661 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
662 void *buf, int bufsize)
664 struct usb_serial *serial = port->serial;
665 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
669 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
673 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
674 req, REQTYPE_HOST_TO_INTERFACE, 0,
675 port_priv->bInterfaceNumber, dmabuf, bufsize,
676 USB_CTRL_SET_TIMEOUT);
681 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
682 req, bufsize, result);
690 * Writes any 32-bit CP210X_ register identified by req.
692 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
696 le32_val = cpu_to_le32(val);
698 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
701 #ifdef CONFIG_GPIOLIB
703 * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
704 * Data in buf must be in native USB byte order.
706 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
707 u16 val, void *buf, int bufsize)
712 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
716 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
717 CP210X_VENDOR_SPECIFIC, type, val,
718 cp210x_interface_num(serial), dmabuf, bufsize,
719 USB_CTRL_SET_TIMEOUT);
724 dev_err(&serial->interface->dev,
725 "failed to set vendor val 0x%04x size %d: %d\n", val,
734 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
736 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
739 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
741 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
746 cp210x_set_termios(tty, port, NULL);
748 result = usb_serial_generic_open(tty, port);
755 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
756 port_priv->event_mode = false;
761 static void cp210x_close(struct usb_serial_port *port)
763 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
765 usb_serial_generic_close(port);
767 /* Clear both queues; cp2108 needs this to avoid an occasional hang */
768 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
770 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
772 /* Disabling the interface disables event-insertion mode. */
773 port_priv->event_mode = false;
776 static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag)
778 if (lsr & CP210X_LSR_BREAK) {
781 } else if (lsr & CP210X_LSR_PARITY) {
782 port->icount.parity++;
784 } else if (lsr & CP210X_LSR_FRAME) {
785 port->icount.frame++;
789 if (lsr & CP210X_LSR_OVERRUN) {
790 port->icount.overrun++;
791 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
795 static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag)
797 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
799 switch (port_priv->event_state) {
801 if (*ch == CP210X_ESCCHAR) {
802 port_priv->event_state = ES_ESCAPE;
809 dev_dbg(&port->dev, "%s - escape char\n", __func__);
810 *ch = CP210X_ESCCHAR;
811 port_priv->event_state = ES_DATA;
814 port_priv->event_state = ES_LSR_DATA_0;
817 port_priv->event_state = ES_LSR;
820 port_priv->event_state = ES_MSR;
823 dev_err(&port->dev, "malformed event 0x%02x\n", *ch);
824 port_priv->event_state = ES_DATA;
829 port_priv->lsr = *ch;
830 port_priv->event_state = ES_LSR_DATA_1;
833 dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n",
834 __func__, port_priv->lsr, *ch);
835 cp210x_process_lsr(port, port_priv->lsr, flag);
836 port_priv->event_state = ES_DATA;
839 dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch);
840 port_priv->lsr = *ch;
841 cp210x_process_lsr(port, port_priv->lsr, flag);
842 port_priv->event_state = ES_DATA;
845 dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch);
847 port_priv->event_state = ES_DATA;
854 static void cp210x_process_read_urb(struct urb *urb)
856 struct usb_serial_port *port = urb->context;
857 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
858 unsigned char *ch = urb->transfer_buffer;
862 if (!urb->actual_length)
865 if (port_priv->event_mode) {
866 for (i = 0; i < urb->actual_length; i++, ch++) {
869 if (cp210x_process_char(port, ch, &flag))
872 tty_insert_flip_char(&port->port, *ch, flag);
875 tty_insert_flip_string(&port->port, ch, urb->actual_length);
877 tty_flip_buffer_push(&port->port);
881 * Read how many bytes are waiting in the TX queue.
883 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
886 struct usb_serial *serial = port->serial;
887 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
888 struct cp210x_comm_status *sts;
891 sts = kmalloc(sizeof(*sts), GFP_KERNEL);
895 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
896 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
897 0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
898 USB_CTRL_GET_TIMEOUT);
899 if (result == sizeof(*sts)) {
900 *count = le32_to_cpu(sts->ulAmountInOutQueue);
903 dev_err(&port->dev, "failed to get comm status: %d\n", result);
913 static bool cp210x_tx_empty(struct usb_serial_port *port)
918 err = cp210x_get_tx_queue_byte_count(port, &count);
930 static const struct cp210x_rate cp210x_an205_table1[] = {
963 * Quantises the baud rate as per AN205 Table 1
965 static speed_t cp210x_get_an205_rate(speed_t baud)
969 for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) {
970 if (baud <= cp210x_an205_table1[i].high)
974 return cp210x_an205_table1[i].rate;
977 static speed_t cp210x_get_actual_rate(speed_t baud)
979 unsigned int prescale = 1;
985 div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud);
986 baud = 48000000 / (2 * prescale * div);
992 * CP2101 supports the following baud rates:
994 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
995 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
997 * CP2102 and CP2103 support the following additional rates:
999 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
1002 * The device will map a requested rate to a supported one, but the result
1003 * of requests for rates greater than 1053257 is undefined (see AN205).
1005 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
1006 * respectively, with an error less than 1%. The actual rates are determined
1009 * div = round(freq / (2 x prescale x request))
1010 * actual = freq / (2 x prescale x div)
1012 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1014 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1017 static void cp210x_change_speed(struct tty_struct *tty,
1018 struct usb_serial_port *port, struct ktermios *old_termios)
1020 struct usb_serial *serial = port->serial;
1021 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1025 * This maps the requested rate to the actual rate, a valid rate on
1026 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed].
1028 * NOTE: B0 is not implemented.
1030 baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed);
1032 if (priv->use_actual_rate)
1033 baud = cp210x_get_actual_rate(baud);
1034 else if (baud < 1000000)
1035 baud = cp210x_get_an205_rate(baud);
1037 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1038 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1039 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1041 baud = old_termios->c_ospeed;
1046 tty_encode_baud_rate(tty, baud, baud);
1049 static void cp210x_enable_event_mode(struct usb_serial_port *port)
1051 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1054 if (port_priv->event_mode)
1057 port_priv->event_state = ES_DATA;
1058 port_priv->event_mode = true;
1060 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR);
1062 dev_err(&port->dev, "failed to enable events: %d\n", ret);
1063 port_priv->event_mode = false;
1067 static void cp210x_disable_event_mode(struct usb_serial_port *port)
1069 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1072 if (!port_priv->event_mode)
1075 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0);
1077 dev_err(&port->dev, "failed to disable events: %d\n", ret);
1081 port_priv->event_mode = false;
1084 static int cp210x_set_chars(struct usb_serial_port *port,
1085 struct cp210x_special_chars *chars)
1087 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1088 struct usb_serial *serial = port->serial;
1092 dmabuf = kmemdup(chars, sizeof(*chars), GFP_KERNEL);
1096 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1097 CP210X_SET_CHARS, REQTYPE_HOST_TO_INTERFACE, 0,
1098 port_priv->bInterfaceNumber,
1099 dmabuf, sizeof(*chars), USB_CTRL_SET_TIMEOUT);
1104 dev_err(&port->dev, "failed to set special chars: %d\n", result);
1111 static bool cp210x_termios_change(const struct ktermios *a, const struct ktermios *b)
1113 bool iflag_change, cc_change;
1115 iflag_change = ((a->c_iflag ^ b->c_iflag) & (INPCK | IXON | IXOFF));
1116 cc_change = a->c_cc[VSTART] != b->c_cc[VSTART] ||
1117 a->c_cc[VSTOP] != b->c_cc[VSTOP];
1119 return tty_termios_hw_change(a, b) || iflag_change || cc_change;
1122 static void cp210x_set_flow_control(struct tty_struct *tty,
1123 struct usb_serial_port *port, struct ktermios *old_termios)
1125 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1126 struct cp210x_special_chars chars;
1127 struct cp210x_flow_ctl flow_ctl;
1133 C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS) &&
1134 I_IXON(tty) == (old_termios->c_iflag & IXON) &&
1135 I_IXOFF(tty) == (old_termios->c_iflag & IXOFF) &&
1136 START_CHAR(tty) == old_termios->c_cc[VSTART] &&
1137 STOP_CHAR(tty) == old_termios->c_cc[VSTOP]) {
1141 if (I_IXON(tty) || I_IXOFF(tty)) {
1142 memset(&chars, 0, sizeof(chars));
1144 chars.bXonChar = START_CHAR(tty);
1145 chars.bXoffChar = STOP_CHAR(tty);
1147 ret = cp210x_set_chars(port, &chars);
1152 mutex_lock(&port_priv->mutex);
1154 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1159 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1160 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1162 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1163 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1164 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1165 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1167 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE;
1169 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE;
1171 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1172 if (C_CRTSCTS(tty)) {
1173 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1175 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL;
1177 flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1178 port_priv->crtscts = true;
1180 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1182 flow_repl |= CP210X_SERIAL_RTS_ACTIVE;
1184 flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1185 port_priv->crtscts = false;
1189 flow_repl |= CP210X_SERIAL_AUTO_RECEIVE;
1191 flow_repl &= ~CP210X_SERIAL_AUTO_RECEIVE;
1194 flow_repl |= CP210X_SERIAL_AUTO_TRANSMIT;
1196 flow_repl &= ~CP210X_SERIAL_AUTO_TRANSMIT;
1198 flow_ctl.ulXonLimit = cpu_to_le32(128);
1199 flow_ctl.ulXoffLimit = cpu_to_le32(128);
1201 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", __func__,
1204 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1205 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1207 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1210 mutex_unlock(&port_priv->mutex);
1213 static void cp210x_set_termios(struct tty_struct *tty,
1214 struct usb_serial_port *port, struct ktermios *old_termios)
1216 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1220 if (old_termios && !cp210x_termios_change(&tty->termios, old_termios))
1223 if (!old_termios || tty->termios.c_ospeed != old_termios->c_ospeed)
1224 cp210x_change_speed(tty, port, old_termios);
1226 /* CP2101 only supports CS8, 1 stop bit and non-stick parity. */
1227 if (priv->partnum == CP210X_PARTNUM_CP2101) {
1228 tty->termios.c_cflag &= ~(CSIZE | CSTOPB | CMSPAR);
1229 tty->termios.c_cflag |= CS8;
1234 switch (C_CSIZE(tty)) {
1236 bits |= BITS_DATA_5;
1239 bits |= BITS_DATA_6;
1242 bits |= BITS_DATA_7;
1246 bits |= BITS_DATA_8;
1250 if (C_PARENB(tty)) {
1251 if (C_CMSPAR(tty)) {
1253 bits |= BITS_PARITY_MARK;
1255 bits |= BITS_PARITY_SPACE;
1258 bits |= BITS_PARITY_ODD;
1260 bits |= BITS_PARITY_EVEN;
1265 bits |= BITS_STOP_2;
1267 bits |= BITS_STOP_1;
1269 ret = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1271 dev_err(&port->dev, "failed to set line control: %d\n", ret);
1273 cp210x_set_flow_control(tty, port, old_termios);
1276 * Enable event-insertion mode only if input parity checking is
1280 cp210x_enable_event_mode(port);
1282 cp210x_disable_event_mode(port);
1285 static int cp210x_tiocmset(struct tty_struct *tty,
1286 unsigned int set, unsigned int clear)
1288 struct usb_serial_port *port = tty->driver_data;
1289 return cp210x_tiocmset_port(port, set, clear);
1292 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1293 unsigned int set, unsigned int clear)
1295 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1296 struct cp210x_flow_ctl flow_ctl;
1297 u32 ctl_hs, flow_repl;
1301 mutex_lock(&port_priv->mutex);
1303 if (set & TIOCM_RTS) {
1304 port_priv->rts = true;
1305 control |= CONTROL_RTS;
1306 control |= CONTROL_WRITE_RTS;
1308 if (set & TIOCM_DTR) {
1309 port_priv->dtr = true;
1310 control |= CONTROL_DTR;
1311 control |= CONTROL_WRITE_DTR;
1313 if (clear & TIOCM_RTS) {
1314 port_priv->rts = false;
1315 control &= ~CONTROL_RTS;
1316 control |= CONTROL_WRITE_RTS;
1318 if (clear & TIOCM_DTR) {
1319 port_priv->dtr = false;
1320 control &= ~CONTROL_DTR;
1321 control |= CONTROL_WRITE_DTR;
1325 * Use SET_FLOW to set DTR and enable/disable auto-RTS when hardware
1326 * flow control is enabled.
1328 if (port_priv->crtscts && control & CONTROL_WRITE_RTS) {
1329 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1334 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1335 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1337 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1339 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE;
1341 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE;
1343 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1345 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL;
1347 flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1349 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1350 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1352 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n",
1353 __func__, ctl_hs, flow_repl);
1355 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1358 dev_dbg(&port->dev, "%s - control = 0x%04x\n", __func__, control);
1360 ret = cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1363 mutex_unlock(&port_priv->mutex);
1368 static void cp210x_dtr_rts(struct usb_serial_port *port, int on)
1371 cp210x_tiocmset_port(port, TIOCM_DTR | TIOCM_RTS, 0);
1373 cp210x_tiocmset_port(port, 0, TIOCM_DTR | TIOCM_RTS);
1376 static int cp210x_tiocmget(struct tty_struct *tty)
1378 struct usb_serial_port *port = tty->driver_data;
1382 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1386 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1387 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1388 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1389 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1390 |((control & CONTROL_RING)? TIOCM_RI : 0)
1391 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
1393 dev_dbg(&port->dev, "%s - control = 0x%02x\n", __func__, control);
1398 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1400 struct usb_serial_port *port = tty->driver_data;
1403 if (break_state == 0)
1407 dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1408 state == BREAK_OFF ? "off" : "on");
1409 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1412 #ifdef CONFIG_GPIOLIB
1413 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1415 struct usb_serial *serial = gpiochip_get_data(gc);
1416 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1417 u8 req_type = REQTYPE_DEVICE_TO_HOST;
1421 if (priv->partnum == CP210X_PARTNUM_CP2105)
1422 req_type = REQTYPE_INTERFACE_TO_HOST;
1424 result = usb_autopm_get_interface(serial->interface);
1428 result = cp210x_read_vendor_block(serial, req_type,
1429 CP210X_READ_LATCH, &buf, sizeof(buf));
1430 usb_autopm_put_interface(serial->interface);
1434 return !!(buf & BIT(gpio));
1437 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1439 struct usb_serial *serial = gpiochip_get_data(gc);
1440 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1441 struct cp210x_gpio_write buf;
1445 buf.state = BIT(gpio);
1449 buf.mask = BIT(gpio);
1451 result = usb_autopm_get_interface(serial->interface);
1455 if (priv->partnum == CP210X_PARTNUM_CP2105) {
1456 result = cp210x_write_vendor_block(serial,
1457 REQTYPE_HOST_TO_INTERFACE,
1458 CP210X_WRITE_LATCH, &buf,
1461 u16 wIndex = buf.state << 8 | buf.mask;
1463 result = usb_control_msg(serial->dev,
1464 usb_sndctrlpipe(serial->dev, 0),
1465 CP210X_VENDOR_SPECIFIC,
1466 REQTYPE_HOST_TO_DEVICE,
1469 NULL, 0, USB_CTRL_SET_TIMEOUT);
1472 usb_autopm_put_interface(serial->interface);
1475 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n",
1480 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1482 struct usb_serial *serial = gpiochip_get_data(gc);
1483 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1485 return priv->gpio_input & BIT(gpio);
1488 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
1490 struct usb_serial *serial = gpiochip_get_data(gc);
1491 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1493 if (priv->partnum == CP210X_PARTNUM_CP2105) {
1494 /* hardware does not support an input mode */
1498 /* push-pull pins cannot be changed to be inputs */
1499 if (priv->gpio_pushpull & BIT(gpio))
1502 /* make sure to release pin if it is being driven low */
1503 cp210x_gpio_set(gc, gpio, 1);
1505 priv->gpio_input |= BIT(gpio);
1510 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1513 struct usb_serial *serial = gpiochip_get_data(gc);
1514 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1516 priv->gpio_input &= ~BIT(gpio);
1517 cp210x_gpio_set(gc, gpio, value);
1522 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
1523 unsigned long config)
1525 struct usb_serial *serial = gpiochip_get_data(gc);
1526 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1527 enum pin_config_param param = pinconf_to_config_param(config);
1529 /* Succeed only if in correct mode (this can't be set at runtime) */
1530 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) &&
1531 (priv->gpio_pushpull & BIT(gpio)))
1534 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) &&
1535 !(priv->gpio_pushpull & BIT(gpio)))
1541 static int cp210x_gpio_init_valid_mask(struct gpio_chip *gc,
1542 unsigned long *valid_mask, unsigned int ngpios)
1544 struct usb_serial *serial = gpiochip_get_data(gc);
1545 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1546 struct device *dev = &serial->interface->dev;
1547 unsigned long altfunc_mask = priv->gpio_altfunc;
1549 bitmap_complement(valid_mask, &altfunc_mask, ngpios);
1551 if (bitmap_empty(valid_mask, ngpios))
1552 dev_dbg(dev, "no pin configured for GPIO\n");
1554 dev_dbg(dev, "GPIO.%*pbl configured for GPIO\n", ngpios,
1560 * This function is for configuring GPIO using shared pins, where other signals
1561 * are made unavailable by configuring the use of GPIO. This is believed to be
1562 * only applicable to the cp2105 at this point, the other devices supported by
1563 * this driver that provide GPIO do so in a way that does not impact other
1564 * signals and are thus expected to have very different initialisation.
1566 static int cp2105_gpioconf_init(struct usb_serial *serial)
1568 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1569 struct cp210x_pin_mode mode;
1570 struct cp210x_dual_port_config config;
1571 u8 intf_num = cp210x_interface_num(serial);
1575 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1576 CP210X_GET_DEVICEMODE, &mode,
1581 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1582 CP210X_GET_PORTCONFIG, &config,
1587 /* 2 banks of GPIO - One for the pins taken from each serial port */
1588 if (intf_num == 0) {
1589 if (mode.eci == CP210X_PIN_MODE_MODEM) {
1590 /* mark all GPIOs of this interface as reserved */
1591 priv->gpio_altfunc = 0xff;
1595 iface_config = config.eci_cfg;
1596 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1597 CP210X_ECI_GPIO_MODE_MASK) >>
1598 CP210X_ECI_GPIO_MODE_OFFSET);
1600 } else if (intf_num == 1) {
1601 if (mode.sci == CP210X_PIN_MODE_MODEM) {
1602 /* mark all GPIOs of this interface as reserved */
1603 priv->gpio_altfunc = 0xff;
1607 iface_config = config.sci_cfg;
1608 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1609 CP210X_SCI_GPIO_MODE_MASK) >>
1610 CP210X_SCI_GPIO_MODE_OFFSET);
1616 /* mark all pins which are not in GPIO mode */
1617 if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */
1618 priv->gpio_altfunc |= BIT(0);
1619 if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */
1620 CP2105_GPIO1_RS485_MODE))
1621 priv->gpio_altfunc |= BIT(1);
1623 /* driver implementation for CP2105 only supports outputs */
1624 priv->gpio_input = 0;
1629 static int cp2104_gpioconf_init(struct usb_serial *serial)
1631 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1632 struct cp210x_single_port_config config;
1638 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1639 CP210X_GET_PORTCONFIG, &config,
1646 iface_config = config.device_cfg;
1647 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1648 CP210X_GPIO_MODE_MASK) >>
1649 CP210X_GPIO_MODE_OFFSET);
1650 gpio_latch = (u8)((le16_to_cpu(config.reset_state) &
1651 CP210X_GPIO_MODE_MASK) >>
1652 CP210X_GPIO_MODE_OFFSET);
1654 /* mark all pins which are not in GPIO mode */
1655 if (iface_config & CP2104_GPIO0_TXLED_MODE) /* GPIO 0 */
1656 priv->gpio_altfunc |= BIT(0);
1657 if (iface_config & CP2104_GPIO1_RXLED_MODE) /* GPIO 1 */
1658 priv->gpio_altfunc |= BIT(1);
1659 if (iface_config & CP2104_GPIO2_RS485_MODE) /* GPIO 2 */
1660 priv->gpio_altfunc |= BIT(2);
1663 * Like CP2102N, CP2104 has also no strict input and output pin
1665 * Do the same input mode emulation as CP2102N.
1667 for (i = 0; i < priv->gc.ngpio; ++i) {
1669 * Set direction to "input" iff pin is open-drain and reset
1672 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1673 priv->gpio_input |= BIT(i);
1679 static int cp2102n_gpioconf_init(struct usb_serial *serial)
1681 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1682 const u16 config_size = 0x02a6;
1693 * Retrieve device configuration from the device.
1694 * The array received contains all customization settings done at the
1695 * factory/manufacturer. Format of the array is documented at the
1696 * time of writing at:
1697 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa
1699 config_buf = kmalloc(config_size, GFP_KERNEL);
1703 result = cp210x_read_vendor_block(serial,
1704 REQTYPE_DEVICE_TO_HOST,
1705 CP210X_READ_2NCONFIG,
1713 config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX];
1714 gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX];
1715 gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX];
1716 gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX];
1720 /* Make sure this is a config format we understand. */
1721 if (config_version != 0x01)
1727 * Get default pin states after reset. Needed so we can determine
1728 * the direction of an open-drain pin.
1730 gpio_latch = (gpio_rst_latch >> 3) & 0x0f;
1732 /* 0 indicates open-drain mode, 1 is push-pull */
1733 priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f;
1735 /* 0 indicates GPIO mode, 1 is alternate function */
1736 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f;
1738 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) {
1740 * For the QFN28 package, GPIO4-6 are controlled by
1741 * the low three bits of the mode/latch fields.
1742 * Contrary to the document linked above, the bits for
1743 * the SUSPEND pins are elsewhere. No alternate
1744 * function is available for these pins.
1747 gpio_latch |= (gpio_rst_latch & 7) << 4;
1748 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4;
1752 * The CP2102N does not strictly has input and output pin modes,
1753 * it only knows open-drain and push-pull modes which is set at
1754 * factory. An open-drain pin can function both as an
1755 * input or an output. We emulate input mode for open-drain pins
1756 * by making sure they are not driven low, and we do not allow
1757 * push-pull pins to be set as an input.
1759 for (i = 0; i < priv->gc.ngpio; ++i) {
1761 * Set direction to "input" iff pin is open-drain and reset
1764 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1765 priv->gpio_input |= BIT(i);
1771 static int cp210x_gpio_init(struct usb_serial *serial)
1773 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1776 switch (priv->partnum) {
1777 case CP210X_PARTNUM_CP2104:
1778 result = cp2104_gpioconf_init(serial);
1780 case CP210X_PARTNUM_CP2105:
1781 result = cp2105_gpioconf_init(serial);
1783 case CP210X_PARTNUM_CP2102N_QFN28:
1784 case CP210X_PARTNUM_CP2102N_QFN24:
1785 case CP210X_PARTNUM_CP2102N_QFN20:
1786 result = cp2102n_gpioconf_init(serial);
1795 priv->gc.label = "cp210x";
1796 priv->gc.get_direction = cp210x_gpio_direction_get;
1797 priv->gc.direction_input = cp210x_gpio_direction_input;
1798 priv->gc.direction_output = cp210x_gpio_direction_output;
1799 priv->gc.get = cp210x_gpio_get;
1800 priv->gc.set = cp210x_gpio_set;
1801 priv->gc.set_config = cp210x_gpio_set_config;
1802 priv->gc.init_valid_mask = cp210x_gpio_init_valid_mask;
1803 priv->gc.owner = THIS_MODULE;
1804 priv->gc.parent = &serial->interface->dev;
1806 priv->gc.can_sleep = true;
1808 result = gpiochip_add_data(&priv->gc, serial);
1810 priv->gpio_registered = true;
1815 static void cp210x_gpio_remove(struct usb_serial *serial)
1817 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1819 if (priv->gpio_registered) {
1820 gpiochip_remove(&priv->gc);
1821 priv->gpio_registered = false;
1827 static int cp210x_gpio_init(struct usb_serial *serial)
1832 static void cp210x_gpio_remove(struct usb_serial *serial)
1839 static int cp210x_port_probe(struct usb_serial_port *port)
1841 struct usb_serial *serial = port->serial;
1842 struct cp210x_port_private *port_priv;
1844 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1848 port_priv->bInterfaceNumber = cp210x_interface_num(serial);
1849 mutex_init(&port_priv->mutex);
1851 usb_set_serial_port_data(port, port_priv);
1856 static void cp210x_port_remove(struct usb_serial_port *port)
1858 struct cp210x_port_private *port_priv;
1860 port_priv = usb_get_serial_port_data(port);
1864 static void cp210x_init_max_speed(struct usb_serial *serial)
1866 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1867 bool use_actual_rate = false;
1871 switch (priv->partnum) {
1872 case CP210X_PARTNUM_CP2101:
1875 case CP210X_PARTNUM_CP2102:
1876 case CP210X_PARTNUM_CP2103:
1879 case CP210X_PARTNUM_CP2104:
1880 use_actual_rate = true;
1883 case CP210X_PARTNUM_CP2108:
1886 case CP210X_PARTNUM_CP2105:
1887 if (cp210x_interface_num(serial) == 0) {
1888 use_actual_rate = true;
1889 max = 2000000; /* ECI */
1892 max = 921600; /* SCI */
1895 case CP210X_PARTNUM_CP2102N_QFN28:
1896 case CP210X_PARTNUM_CP2102N_QFN24:
1897 case CP210X_PARTNUM_CP2102N_QFN20:
1898 use_actual_rate = true;
1906 priv->min_speed = min;
1907 priv->max_speed = max;
1908 priv->use_actual_rate = use_actual_rate;
1911 static int cp210x_attach(struct usb_serial *serial)
1914 struct cp210x_serial_private *priv;
1916 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1920 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1921 CP210X_GET_PARTNUM, &priv->partnum,
1922 sizeof(priv->partnum));
1924 dev_warn(&serial->interface->dev,
1925 "querying part number failed\n");
1926 priv->partnum = CP210X_PARTNUM_UNKNOWN;
1929 usb_set_serial_data(serial, priv);
1931 cp210x_init_max_speed(serial);
1933 result = cp210x_gpio_init(serial);
1935 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n",
1942 static void cp210x_disconnect(struct usb_serial *serial)
1944 cp210x_gpio_remove(serial);
1947 static void cp210x_release(struct usb_serial *serial)
1949 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1951 cp210x_gpio_remove(serial);
1956 module_usb_serial_driver(serial_drivers, id_table);
1958 MODULE_DESCRIPTION(DRIVER_DESC);
1959 MODULE_LICENSE("GPL v2");