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USB: serial: cp210x: re-enable auto-RTS on open
[linux/fpc-iii.git] / drivers / usb / serial / cp210x.c
blob22c5ad23b1cd167cb58440f4e74c17666f7882ee
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Silicon Laboratories CP210x USB to RS232 serial adaptor driver
4 *
5 * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
6 *
7 * Support to set flow control line levels using TIOCMGET and TIOCMSET
8 * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow
9 * control thanks to Munir Nassar nassarmu@real-time.com
10 *
11 */
12
13 #include <linux/kernel.h>
14 #include <linux/errno.h>
15 #include <linux/slab.h>
16 #include <linux/tty.h>
17 #include <linux/tty_flip.h>
18 #include <linux/module.h>
19 #include <linux/moduleparam.h>
20 #include <linux/usb.h>
21 #include <linux/uaccess.h>
22 #include <linux/usb/serial.h>
23 #include <linux/gpio/driver.h>
24 #include <linux/bitops.h>
25 #include <linux/mutex.h>
26
27 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
28
29 /*
30 * Function Prototypes
31 */
32 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
33 static void cp210x_close(struct usb_serial_port *);
34 static void cp210x_get_termios(struct tty_struct *, struct usb_serial_port *);
35 static void cp210x_get_termios_port(struct usb_serial_port *port,
36 tcflag_t *cflagp, unsigned int *baudp);
37 static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *,
38 struct ktermios *);
39 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
40 struct ktermios*);
41 static bool cp210x_tx_empty(struct usb_serial_port *port);
42 static int cp210x_tiocmget(struct tty_struct *);
43 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
44 static int cp210x_tiocmset_port(struct usb_serial_port *port,
45 unsigned int, unsigned int);
46 static void cp210x_break_ctl(struct tty_struct *, int);
47 static int cp210x_attach(struct usb_serial *);
48 static void cp210x_disconnect(struct usb_serial *);
49 static void cp210x_release(struct usb_serial *);
50 static int cp210x_port_probe(struct usb_serial_port *);
51 static int cp210x_port_remove(struct usb_serial_port *);
52 static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
53
54 static const struct usb_device_id id_table[] = {
55 { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */
56 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
57 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
58 { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
59 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
60 { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */
61 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
62 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
63 { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */
64 { USB_DEVICE(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, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */
149 { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */
150 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
151 { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */
152 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
153 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
154 { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */
155 { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */
156 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
157 { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */
158 { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */
159 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
160 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
161 { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */
162 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
163 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
164 { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */
165 { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */
166 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
167 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
168 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
169 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
170 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
171 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
172 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
173 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
174 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
175 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
176 { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */
177 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
178 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
179 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
180 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
181 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
182 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
183 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
184 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
185 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
186 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
187 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
188 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
189 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
190 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
191 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
192 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
193 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
194 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
195 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
196 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
197 { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */
198 { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */
199 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
200 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
201 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
202 { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */
203 { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */
204 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
205 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
206 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
207 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
208 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
209 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
210 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
211 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
212 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
213 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
214 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
215 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
216 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
217 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
218 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
219 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
220 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
221 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
222 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
223 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
224 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
225 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
226 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
227 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
228 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
229 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
230 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
231 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
232 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
233 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
234 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
235 { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */
236 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
237 { } /* Terminating Entry */
238 };
239
240 MODULE_DEVICE_TABLE(usb, id_table);
241
242 struct cp210x_serial_private {
243 #ifdef CONFIG_GPIOLIB
244 struct gpio_chip gc;
245 bool gpio_registered;
246 u8 gpio_pushpull;
247 u8 gpio_altfunc;
248 u8 gpio_input;
249 #endif
250 u8 partnum;
251 speed_t min_speed;
252 speed_t max_speed;
253 bool use_actual_rate;
254 };
255
256 struct cp210x_port_private {
257 __u8 bInterfaceNumber;
258 bool has_swapped_line_ctl;
259 };
260
261 static struct usb_serial_driver cp210x_device = {
262 .driver = {
263 .owner = THIS_MODULE,
264 .name = "cp210x",
265 },
266 .id_table = id_table,
267 .num_ports = 1,
268 .bulk_in_size = 256,
269 .bulk_out_size = 256,
270 .open = cp210x_open,
271 .close = cp210x_close,
272 .break_ctl = cp210x_break_ctl,
273 .set_termios = cp210x_set_termios,
274 .tx_empty = cp210x_tx_empty,
275 .tiocmget = cp210x_tiocmget,
276 .tiocmset = cp210x_tiocmset,
277 .attach = cp210x_attach,
278 .disconnect = cp210x_disconnect,
279 .release = cp210x_release,
280 .port_probe = cp210x_port_probe,
281 .port_remove = cp210x_port_remove,
282 .dtr_rts = cp210x_dtr_rts
283 };
284
285 static struct usb_serial_driver * const serial_drivers[] = {
286 &cp210x_device, NULL
287 };
288
289 /* Config request types */
290 #define REQTYPE_HOST_TO_INTERFACE 0x41
291 #define REQTYPE_INTERFACE_TO_HOST 0xc1
292 #define REQTYPE_HOST_TO_DEVICE 0x40
293 #define REQTYPE_DEVICE_TO_HOST 0xc0
294
295 /* Config request codes */
296 #define CP210X_IFC_ENABLE 0x00
297 #define CP210X_SET_BAUDDIV 0x01
298 #define CP210X_GET_BAUDDIV 0x02
299 #define CP210X_SET_LINE_CTL 0x03
300 #define CP210X_GET_LINE_CTL 0x04
301 #define CP210X_SET_BREAK 0x05
302 #define CP210X_IMM_CHAR 0x06
303 #define CP210X_SET_MHS 0x07
304 #define CP210X_GET_MDMSTS 0x08
305 #define CP210X_SET_XON 0x09
306 #define CP210X_SET_XOFF 0x0A
307 #define CP210X_SET_EVENTMASK 0x0B
308 #define CP210X_GET_EVENTMASK 0x0C
309 #define CP210X_SET_CHAR 0x0D
310 #define CP210X_GET_CHARS 0x0E
311 #define CP210X_GET_PROPS 0x0F
312 #define CP210X_GET_COMM_STATUS 0x10
313 #define CP210X_RESET 0x11
314 #define CP210X_PURGE 0x12
315 #define CP210X_SET_FLOW 0x13
316 #define CP210X_GET_FLOW 0x14
317 #define CP210X_EMBED_EVENTS 0x15
318 #define CP210X_GET_EVENTSTATE 0x16
319 #define CP210X_SET_CHARS 0x19
320 #define CP210X_GET_BAUDRATE 0x1D
321 #define CP210X_SET_BAUDRATE 0x1E
322 #define CP210X_VENDOR_SPECIFIC 0xFF
323
324 /* CP210X_IFC_ENABLE */
325 #define UART_ENABLE 0x0001
326 #define UART_DISABLE 0x0000
327
328 /* CP210X_(SET|GET)_BAUDDIV */
329 #define BAUD_RATE_GEN_FREQ 0x384000
330
331 /* CP210X_(SET|GET)_LINE_CTL */
332 #define BITS_DATA_MASK 0X0f00
333 #define BITS_DATA_5 0X0500
334 #define BITS_DATA_6 0X0600
335 #define BITS_DATA_7 0X0700
336 #define BITS_DATA_8 0X0800
337 #define BITS_DATA_9 0X0900
338
339 #define BITS_PARITY_MASK 0x00f0
340 #define BITS_PARITY_NONE 0x0000
341 #define BITS_PARITY_ODD 0x0010
342 #define BITS_PARITY_EVEN 0x0020
343 #define BITS_PARITY_MARK 0x0030
344 #define BITS_PARITY_SPACE 0x0040
345
346 #define BITS_STOP_MASK 0x000f
347 #define BITS_STOP_1 0x0000
348 #define BITS_STOP_1_5 0x0001
349 #define BITS_STOP_2 0x0002
350
351 /* CP210X_SET_BREAK */
352 #define BREAK_ON 0x0001
353 #define BREAK_OFF 0x0000
354
355 /* CP210X_(SET_MHS|GET_MDMSTS) */
356 #define CONTROL_DTR 0x0001
357 #define CONTROL_RTS 0x0002
358 #define CONTROL_CTS 0x0010
359 #define CONTROL_DSR 0x0020
360 #define CONTROL_RING 0x0040
361 #define CONTROL_DCD 0x0080
362 #define CONTROL_WRITE_DTR 0x0100
363 #define CONTROL_WRITE_RTS 0x0200
364
365 /* CP210X_VENDOR_SPECIFIC values */
366 #define CP210X_READ_2NCONFIG 0x000E
367 #define CP210X_READ_LATCH 0x00C2
368 #define CP210X_GET_PARTNUM 0x370B
369 #define CP210X_GET_PORTCONFIG 0x370C
370 #define CP210X_GET_DEVICEMODE 0x3711
371 #define CP210X_WRITE_LATCH 0x37E1
372
373 /* Part number definitions */
374 #define CP210X_PARTNUM_CP2101 0x01
375 #define CP210X_PARTNUM_CP2102 0x02
376 #define CP210X_PARTNUM_CP2103 0x03
377 #define CP210X_PARTNUM_CP2104 0x04
378 #define CP210X_PARTNUM_CP2105 0x05
379 #define CP210X_PARTNUM_CP2108 0x08
380 #define CP210X_PARTNUM_CP2102N_QFN28 0x20
381 #define CP210X_PARTNUM_CP2102N_QFN24 0x21
382 #define CP210X_PARTNUM_CP2102N_QFN20 0x22
383 #define CP210X_PARTNUM_UNKNOWN 0xFF
384
385 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
386 struct cp210x_comm_status {
387 __le32 ulErrors;
388 __le32 ulHoldReasons;
389 __le32 ulAmountInInQueue;
390 __le32 ulAmountInOutQueue;
391 u8 bEofReceived;
392 u8 bWaitForImmediate;
393 u8 bReserved;
394 } __packed;
395
396 /*
397 * CP210X_PURGE - 16 bits passed in wValue of USB request.
398 * SiLabs app note AN571 gives a strange description of the 4 bits:
399 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
400 * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
401 */
402 #define PURGE_ALL 0x000f
403
404 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
405 struct cp210x_flow_ctl {
406 __le32 ulControlHandshake;
407 __le32 ulFlowReplace;
408 __le32 ulXonLimit;
409 __le32 ulXoffLimit;
410 } __packed;
411
412 /* cp210x_flow_ctl::ulControlHandshake */
413 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0)
414 #define CP210X_SERIAL_DTR_SHIFT(_mode) (_mode)
415 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3)
416 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4)
417 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5)
418 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6)
419
420 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */
421 #define CP210X_SERIAL_DTR_INACTIVE 0
422 #define CP210X_SERIAL_DTR_ACTIVE 1
423 #define CP210X_SERIAL_DTR_FLOW_CTL 2
424
425 /* cp210x_flow_ctl::ulFlowReplace */
426 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0)
427 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1)
428 #define CP210X_SERIAL_ERROR_CHAR BIT(2)
429 #define CP210X_SERIAL_NULL_STRIPPING BIT(3)
430 #define CP210X_SERIAL_BREAK_CHAR BIT(4)
431 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6)
432 #define CP210X_SERIAL_RTS_SHIFT(_mode) (_mode << 6)
433 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31)
434
435 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */
436 #define CP210X_SERIAL_RTS_INACTIVE 0
437 #define CP210X_SERIAL_RTS_ACTIVE 1
438 #define CP210X_SERIAL_RTS_FLOW_CTL 2
439
440 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
441 struct cp210x_pin_mode {
442 u8 eci;
443 u8 sci;
444 } __packed;
445
446 #define CP210X_PIN_MODE_MODEM 0
447 #define CP210X_PIN_MODE_GPIO BIT(0)
448
449 /*
450 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes
451 * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes.
452 */
453 struct cp210x_dual_port_config {
454 __le16 gpio_mode;
455 u8 __pad0[2];
456 __le16 reset_state;
457 u8 __pad1[4];
458 __le16 suspend_state;
459 u8 sci_cfg;
460 u8 eci_cfg;
461 u8 device_cfg;
462 } __packed;
463
464 /*
465 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes
466 * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes.
467 */
468 struct cp210x_single_port_config {
469 __le16 gpio_mode;
470 u8 __pad0[2];
471 __le16 reset_state;
472 u8 __pad1[4];
473 __le16 suspend_state;
474 u8 device_cfg;
475 } __packed;
476
477 /* GPIO modes */
478 #define CP210X_SCI_GPIO_MODE_OFFSET 9
479 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9)
480
481 #define CP210X_ECI_GPIO_MODE_OFFSET 2
482 #define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2)
483
484 #define CP210X_GPIO_MODE_OFFSET 8
485 #define CP210X_GPIO_MODE_MASK GENMASK(11, 8)
486
487 /* CP2105 port configuration values */
488 #define CP2105_GPIO0_TXLED_MODE BIT(0)
489 #define CP2105_GPIO1_RXLED_MODE BIT(1)
490 #define CP2105_GPIO1_RS485_MODE BIT(2)
491
492 /* CP2104 port configuration values */
493 #define CP2104_GPIO0_TXLED_MODE BIT(0)
494 #define CP2104_GPIO1_RXLED_MODE BIT(1)
495 #define CP2104_GPIO2_RS485_MODE BIT(2)
496
497 /* CP2102N configuration array indices */
498 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX 2
499 #define CP210X_2NCONFIG_GPIO_MODE_IDX 581
500 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587
501 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600
502
503 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */
504 struct cp210x_gpio_write {
505 u8 mask;
506 u8 state;
507 } __packed;
508
509 /*
510 * Helper to get interface number when we only have struct usb_serial.
511 */
512 static u8 cp210x_interface_num(struct usb_serial *serial)
513 {
514 struct usb_host_interface *cur_altsetting;
515
516 cur_altsetting = serial->interface->cur_altsetting;
517
518 return cur_altsetting->desc.bInterfaceNumber;
519 }
520
521 /*
522 * Reads a variable-sized block of CP210X_ registers, identified by req.
523 * Returns data into buf in native USB byte order.
524 */
525 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
526 void *buf, int bufsize)
527 {
528 struct usb_serial *serial = port->serial;
529 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
530 void *dmabuf;
531 int result;
532
533 dmabuf = kmalloc(bufsize, GFP_KERNEL);
534 if (!dmabuf) {
535 /*
536 * FIXME Some callers don't bother to check for error,
537 * at least give them consistent junk until they are fixed
538 */
539 memset(buf, 0, bufsize);
540 return -ENOMEM;
541 }
542
543 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
544 req, REQTYPE_INTERFACE_TO_HOST, 0,
545 port_priv->bInterfaceNumber, dmabuf, bufsize,
546 USB_CTRL_SET_TIMEOUT);
547 if (result == bufsize) {
548 memcpy(buf, dmabuf, bufsize);
549 result = 0;
550 } else {
551 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
552 req, bufsize, result);
553 if (result >= 0)
554 result = -EIO;
555
556 /*
557 * FIXME Some callers don't bother to check for error,
558 * at least give them consistent junk until they are fixed
559 */
560 memset(buf, 0, bufsize);
561 }
562
563 kfree(dmabuf);
564
565 return result;
566 }
567
568 /*
569 * Reads any 32-bit CP210X_ register identified by req.
570 */
571 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val)
572 {
573 __le32 le32_val;
574 int err;
575
576 err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val));
577 if (err) {
578 /*
579 * FIXME Some callers don't bother to check for error,
580 * at least give them consistent junk until they are fixed
581 */
582 *val = 0;
583 return err;
584 }
585
586 *val = le32_to_cpu(le32_val);
587
588 return 0;
589 }
590
591 /*
592 * Reads any 16-bit CP210X_ register identified by req.
593 */
594 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val)
595 {
596 __le16 le16_val;
597 int err;
598
599 err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val));
600 if (err)
601 return err;
602
603 *val = le16_to_cpu(le16_val);
604
605 return 0;
606 }
607
608 /*
609 * Reads any 8-bit CP210X_ register identified by req.
610 */
611 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
612 {
613 return cp210x_read_reg_block(port, req, val, sizeof(*val));
614 }
615
616 /*
617 * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
618 * Returns data into buf in native USB byte order.
619 */
620 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
621 void *buf, int bufsize)
622 {
623 void *dmabuf;
624 int result;
625
626 dmabuf = kmalloc(bufsize, GFP_KERNEL);
627 if (!dmabuf)
628 return -ENOMEM;
629
630 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
631 CP210X_VENDOR_SPECIFIC, type, val,
632 cp210x_interface_num(serial), dmabuf, bufsize,
633 USB_CTRL_GET_TIMEOUT);
634 if (result == bufsize) {
635 memcpy(buf, dmabuf, bufsize);
636 result = 0;
637 } else {
638 dev_err(&serial->interface->dev,
639 "failed to get vendor val 0x%04x size %d: %d\n", val,
640 bufsize, result);
641 if (result >= 0)
642 result = -EIO;
643 }
644
645 kfree(dmabuf);
646
647 return result;
648 }
649
650 /*
651 * Writes any 16-bit CP210X_ register (req) whose value is passed
652 * entirely in the wValue field of the USB request.
653 */
654 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
655 {
656 struct usb_serial *serial = port->serial;
657 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
658 int result;
659
660 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
661 req, REQTYPE_HOST_TO_INTERFACE, val,
662 port_priv->bInterfaceNumber, NULL, 0,
663 USB_CTRL_SET_TIMEOUT);
664 if (result < 0) {
665 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
666 req, result);
667 }
668
669 return result;
670 }
671
672 /*
673 * Writes a variable-sized block of CP210X_ registers, identified by req.
674 * Data in buf must be in native USB byte order.
675 */
676 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
677 void *buf, int bufsize)
678 {
679 struct usb_serial *serial = port->serial;
680 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
681 void *dmabuf;
682 int result;
683
684 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
685 if (!dmabuf)
686 return -ENOMEM;
687
688 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
689 req, REQTYPE_HOST_TO_INTERFACE, 0,
690 port_priv->bInterfaceNumber, dmabuf, bufsize,
691 USB_CTRL_SET_TIMEOUT);
692
693 kfree(dmabuf);
694
695 if (result == bufsize) {
696 result = 0;
697 } else {
698 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
699 req, bufsize, result);
700 if (result >= 0)
701 result = -EIO;
702 }
703
704 return result;
705 }
706
707 /*
708 * Writes any 32-bit CP210X_ register identified by req.
709 */
710 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
711 {
712 __le32 le32_val;
713
714 le32_val = cpu_to_le32(val);
715
716 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
717 }
718
719 #ifdef CONFIG_GPIOLIB
720 /*
721 * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
722 * Data in buf must be in native USB byte order.
723 */
724 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
725 u16 val, void *buf, int bufsize)
726 {
727 void *dmabuf;
728 int result;
729
730 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
731 if (!dmabuf)
732 return -ENOMEM;
733
734 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
735 CP210X_VENDOR_SPECIFIC, type, val,
736 cp210x_interface_num(serial), dmabuf, bufsize,
737 USB_CTRL_SET_TIMEOUT);
738
739 kfree(dmabuf);
740
741 if (result == bufsize) {
742 result = 0;
743 } else {
744 dev_err(&serial->interface->dev,
745 "failed to set vendor val 0x%04x size %d: %d\n", val,
746 bufsize, result);
747 if (result >= 0)
748 result = -EIO;
749 }
750
751 return result;
752 }
753 #endif
754
755 /*
756 * Detect CP2108 GET_LINE_CTL bug and activate workaround.
757 * Write a known good value 0x800, read it back.
758 * If it comes back swapped the bug is detected.
759 * Preserve the original register value.
760 */
761 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
762 {
763 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
764 u16 line_ctl_save;
765 u16 line_ctl_test;
766 int err;
767
768 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save);
769 if (err)
770 return err;
771
772 err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800);
773 if (err)
774 return err;
775
776 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test);
777 if (err)
778 return err;
779
780 if (line_ctl_test == 8) {
781 port_priv->has_swapped_line_ctl = true;
782 line_ctl_save = swab16(line_ctl_save);
783 }
784
785 return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save);
786 }
787
788 /*
789 * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL)
790 * to workaround cp2108 bug and get correct value.
791 */
792 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl)
793 {
794 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
795 int err;
796
797 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl);
798 if (err)
799 return err;
800
801 /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
802 if (port_priv->has_swapped_line_ctl)
803 *ctl = swab16(*ctl);
804
805 return 0;
806 }
807
808 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
809 {
810 int result;
811
812 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
813 if (result) {
814 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
815 return result;
816 }
817
818 /* Configure the termios structure */
819 cp210x_get_termios(tty, port);
820
821 /* The baud rate must be initialised on cp2104 */
822 if (tty)
823 cp210x_change_speed(tty, port, NULL);
824
825 return usb_serial_generic_open(tty, port);
826 }
827
828 static void cp210x_close(struct usb_serial_port *port)
829 {
830 usb_serial_generic_close(port);
831
832 /* Clear both queues; cp2108 needs this to avoid an occasional hang */
833 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
834
835 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
836 }
837
838 /*
839 * Read how many bytes are waiting in the TX queue.
840 */
841 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
842 u32 *count)
843 {
844 struct usb_serial *serial = port->serial;
845 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
846 struct cp210x_comm_status *sts;
847 int result;
848
849 sts = kmalloc(sizeof(*sts), GFP_KERNEL);
850 if (!sts)
851 return -ENOMEM;
852
853 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
854 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
855 0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
856 USB_CTRL_GET_TIMEOUT);
857 if (result == sizeof(*sts)) {
858 *count = le32_to_cpu(sts->ulAmountInOutQueue);
859 result = 0;
860 } else {
861 dev_err(&port->dev, "failed to get comm status: %d\n", result);
862 if (result >= 0)
863 result = -EIO;
864 }
865
866 kfree(sts);
867
868 return result;
869 }
870
871 static bool cp210x_tx_empty(struct usb_serial_port *port)
872 {
873 int err;
874 u32 count;
875
876 err = cp210x_get_tx_queue_byte_count(port, &count);
877 if (err)
878 return true;
879
880 return !count;
881 }
882
883 /*
884 * cp210x_get_termios
885 * Reads the baud rate, data bits, parity, stop bits and flow control mode
886 * from the device, corrects any unsupported values, and configures the
887 * termios structure to reflect the state of the device
888 */
889 static void cp210x_get_termios(struct tty_struct *tty,
890 struct usb_serial_port *port)
891 {
892 unsigned int baud;
893
894 if (tty) {
895 cp210x_get_termios_port(tty->driver_data,
896 &tty->termios.c_cflag, &baud);
897 tty_encode_baud_rate(tty, baud, baud);
898 } else {
899 tcflag_t cflag;
900 cflag = 0;
901 cp210x_get_termios_port(port, &cflag, &baud);
902 }
903 }
904
905 /*
906 * cp210x_get_termios_port
907 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
908 */
909 static void cp210x_get_termios_port(struct usb_serial_port *port,
910 tcflag_t *cflagp, unsigned int *baudp)
911 {
912 struct device *dev = &port->dev;
913 tcflag_t cflag;
914 struct cp210x_flow_ctl flow_ctl;
915 u32 baud;
916 u16 bits;
917 u32 ctl_hs;
918 u32 flow_repl;
919
920 cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud);
921
922 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
923 *baudp = baud;
924
925 cflag = *cflagp;
926
927 cp210x_get_line_ctl(port, &bits);
928 cflag &= ~CSIZE;
929 switch (bits & BITS_DATA_MASK) {
930 case BITS_DATA_5:
931 dev_dbg(dev, "%s - data bits = 5\n", __func__);
932 cflag |= CS5;
933 break;
934 case BITS_DATA_6:
935 dev_dbg(dev, "%s - data bits = 6\n", __func__);
936 cflag |= CS6;
937 break;
938 case BITS_DATA_7:
939 dev_dbg(dev, "%s - data bits = 7\n", __func__);
940 cflag |= CS7;
941 break;
942 case BITS_DATA_8:
943 dev_dbg(dev, "%s - data bits = 8\n", __func__);
944 cflag |= CS8;
945 break;
946 case BITS_DATA_9:
947 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
948 cflag |= CS8;
949 bits &= ~BITS_DATA_MASK;
950 bits |= BITS_DATA_8;
951 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
952 break;
953 default:
954 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
955 cflag |= CS8;
956 bits &= ~BITS_DATA_MASK;
957 bits |= BITS_DATA_8;
958 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
959 break;
960 }
961
962 switch (bits & BITS_PARITY_MASK) {
963 case BITS_PARITY_NONE:
964 dev_dbg(dev, "%s - parity = NONE\n", __func__);
965 cflag &= ~PARENB;
966 break;
967 case BITS_PARITY_ODD:
968 dev_dbg(dev, "%s - parity = ODD\n", __func__);
969 cflag |= (PARENB|PARODD);
970 break;
971 case BITS_PARITY_EVEN:
972 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
973 cflag &= ~PARODD;
974 cflag |= PARENB;
975 break;
976 case BITS_PARITY_MARK:
977 dev_dbg(dev, "%s - parity = MARK\n", __func__);
978 cflag |= (PARENB|PARODD|CMSPAR);
979 break;
980 case BITS_PARITY_SPACE:
981 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
982 cflag &= ~PARODD;
983 cflag |= (PARENB|CMSPAR);
984 break;
985 default:
986 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
987 cflag &= ~PARENB;
988 bits &= ~BITS_PARITY_MASK;
989 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
990 break;
991 }
992
993 cflag &= ~CSTOPB;
994 switch (bits & BITS_STOP_MASK) {
995 case BITS_STOP_1:
996 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
997 break;
998 case BITS_STOP_1_5:
999 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
1000 bits &= ~BITS_STOP_MASK;
1001 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1002 break;
1003 case BITS_STOP_2:
1004 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1005 cflag |= CSTOPB;
1006 break;
1007 default:
1008 dev_dbg(dev, "%s - Unknown number of stop bits, 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 }
1013
1014 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1015 sizeof(flow_ctl));
1016 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1017 if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) {
1018 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1019 /*
1020 * When the port is closed, the CP210x hardware disables
1021 * auto-RTS and RTS is deasserted but it leaves auto-CTS when
1022 * in hardware flow control mode. When re-opening the port, if
1023 * auto-CTS is enabled on the cp210x, then auto-RTS must be
1024 * re-enabled in the driver.
1025 */
1026 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1027 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1028 flow_repl |= CP210X_SERIAL_RTS_SHIFT(CP210X_SERIAL_RTS_FLOW_CTL);
1029 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1030 cp210x_write_reg_block(port,
1031 CP210X_SET_FLOW,
1032 &flow_ctl,
1033 sizeof(flow_ctl));
1034
1035 cflag |= CRTSCTS;
1036 } else {
1037 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1038 cflag &= ~CRTSCTS;
1039 }
1040
1041 *cflagp = cflag;
1042 }
1043
1044 struct cp210x_rate {
1045 speed_t rate;
1046 speed_t high;
1047 };
1048
1049 static const struct cp210x_rate cp210x_an205_table1[] = {
1050 { 300, 300 },
1051 { 600, 600 },
1052 { 1200, 1200 },
1053 { 1800, 1800 },
1054 { 2400, 2400 },
1055 { 4000, 4000 },
1056 { 4800, 4803 },
1057 { 7200, 7207 },
1058 { 9600, 9612 },
1059 { 14400, 14428 },
1060 { 16000, 16062 },
1061 { 19200, 19250 },
1062 { 28800, 28912 },
1063 { 38400, 38601 },
1064 { 51200, 51558 },
1065 { 56000, 56280 },
1066 { 57600, 58053 },
1067 { 64000, 64111 },
1068 { 76800, 77608 },
1069 { 115200, 117028 },
1070 { 128000, 129347 },
1071 { 153600, 156868 },
1072 { 230400, 237832 },
1073 { 250000, 254234 },
1074 { 256000, 273066 },
1075 { 460800, 491520 },
1076 { 500000, 567138 },
1077 { 576000, 670254 },
1078 { 921600, UINT_MAX }
1079 };
1080
1081 /*
1082 * Quantises the baud rate as per AN205 Table 1
1083 */
1084 static speed_t cp210x_get_an205_rate(speed_t baud)
1085 {
1086 int i;
1087
1088 for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) {
1089 if (baud <= cp210x_an205_table1[i].high)
1090 break;
1091 }
1092
1093 return cp210x_an205_table1[i].rate;
1094 }
1095
1096 static speed_t cp210x_get_actual_rate(speed_t baud)
1097 {
1098 unsigned int prescale = 1;
1099 unsigned int div;
1100
1101 if (baud <= 365)
1102 prescale = 4;
1103
1104 div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud);
1105 baud = 48000000 / (2 * prescale * div);
1106
1107 return baud;
1108 }
1109
1110 /*
1111 * CP2101 supports the following baud rates:
1112 *
1113 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
1114 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
1115 *
1116 * CP2102 and CP2103 support the following additional rates:
1117 *
1118 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
1119 * 576000
1120 *
1121 * The device will map a requested rate to a supported one, but the result
1122 * of requests for rates greater than 1053257 is undefined (see AN205).
1123 *
1124 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
1125 * respectively, with an error less than 1%. The actual rates are determined
1126 * by
1127 *
1128 * div = round(freq / (2 x prescale x request))
1129 * actual = freq / (2 x prescale x div)
1130 *
1131 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1132 * or 1 otherwise.
1133 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1134 * otherwise.
1135 */
1136 static void cp210x_change_speed(struct tty_struct *tty,
1137 struct usb_serial_port *port, struct ktermios *old_termios)
1138 {
1139 struct usb_serial *serial = port->serial;
1140 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1141 u32 baud;
1142
1143 /*
1144 * This maps the requested rate to the actual rate, a valid rate on
1145 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed].
1146 *
1147 * NOTE: B0 is not implemented.
1148 */
1149 baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed);
1150
1151 if (priv->use_actual_rate)
1152 baud = cp210x_get_actual_rate(baud);
1153 else if (baud < 1000000)
1154 baud = cp210x_get_an205_rate(baud);
1155
1156 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1157 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1158 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1159 if (old_termios)
1160 baud = old_termios->c_ospeed;
1161 else
1162 baud = 9600;
1163 }
1164
1165 tty_encode_baud_rate(tty, baud, baud);
1166 }
1167
1168 static void cp210x_set_termios(struct tty_struct *tty,
1169 struct usb_serial_port *port, struct ktermios *old_termios)
1170 {
1171 struct device *dev = &port->dev;
1172 unsigned int cflag, old_cflag;
1173 u16 bits;
1174
1175 cflag = tty->termios.c_cflag;
1176 old_cflag = old_termios->c_cflag;
1177
1178 if (tty->termios.c_ospeed != old_termios->c_ospeed)
1179 cp210x_change_speed(tty, port, old_termios);
1180
1181 /* If the number of data bits is to be updated */
1182 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
1183 cp210x_get_line_ctl(port, &bits);
1184 bits &= ~BITS_DATA_MASK;
1185 switch (cflag & CSIZE) {
1186 case CS5:
1187 bits |= BITS_DATA_5;
1188 dev_dbg(dev, "%s - data bits = 5\n", __func__);
1189 break;
1190 case CS6:
1191 bits |= BITS_DATA_6;
1192 dev_dbg(dev, "%s - data bits = 6\n", __func__);
1193 break;
1194 case CS7:
1195 bits |= BITS_DATA_7;
1196 dev_dbg(dev, "%s - data bits = 7\n", __func__);
1197 break;
1198 case CS8:
1199 default:
1200 bits |= BITS_DATA_8;
1201 dev_dbg(dev, "%s - data bits = 8\n", __func__);
1202 break;
1203 }
1204 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1205 dev_dbg(dev, "Number of data bits requested not supported by device\n");
1206 }
1207
1208 if ((cflag & (PARENB|PARODD|CMSPAR)) !=
1209 (old_cflag & (PARENB|PARODD|CMSPAR))) {
1210 cp210x_get_line_ctl(port, &bits);
1211 bits &= ~BITS_PARITY_MASK;
1212 if (cflag & PARENB) {
1213 if (cflag & CMSPAR) {
1214 if (cflag & PARODD) {
1215 bits |= BITS_PARITY_MARK;
1216 dev_dbg(dev, "%s - parity = MARK\n", __func__);
1217 } else {
1218 bits |= BITS_PARITY_SPACE;
1219 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
1220 }
1221 } else {
1222 if (cflag & PARODD) {
1223 bits |= BITS_PARITY_ODD;
1224 dev_dbg(dev, "%s - parity = ODD\n", __func__);
1225 } else {
1226 bits |= BITS_PARITY_EVEN;
1227 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
1228 }
1229 }
1230 }
1231 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1232 dev_dbg(dev, "Parity mode not supported by device\n");
1233 }
1234
1235 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
1236 cp210x_get_line_ctl(port, &bits);
1237 bits &= ~BITS_STOP_MASK;
1238 if (cflag & CSTOPB) {
1239 bits |= BITS_STOP_2;
1240 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1241 } else {
1242 bits |= BITS_STOP_1;
1243 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
1244 }
1245 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1246 dev_dbg(dev, "Number of stop bits requested not supported by device\n");
1247 }
1248
1249 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
1250 struct cp210x_flow_ctl flow_ctl;
1251 u32 ctl_hs;
1252 u32 flow_repl;
1253
1254 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1255 sizeof(flow_ctl));
1256 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1257 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1258 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1259 __func__, ctl_hs, flow_repl);
1260
1261 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1262 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1263 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1264 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1265 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE);
1266 if (cflag & CRTSCTS) {
1267 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1268
1269 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1270 flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1271 CP210X_SERIAL_RTS_FLOW_CTL);
1272 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1273 } else {
1274 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1275
1276 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1277 flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1278 CP210X_SERIAL_RTS_ACTIVE);
1279 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1280 }
1281
1282 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1283 __func__, ctl_hs, flow_repl);
1284 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1285 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1286 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1287 sizeof(flow_ctl));
1288 }
1289
1290 }
1291
1292 static int cp210x_tiocmset(struct tty_struct *tty,
1293 unsigned int set, unsigned int clear)
1294 {
1295 struct usb_serial_port *port = tty->driver_data;
1296 return cp210x_tiocmset_port(port, set, clear);
1297 }
1298
1299 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1300 unsigned int set, unsigned int clear)
1301 {
1302 u16 control = 0;
1303
1304 if (set & TIOCM_RTS) {
1305 control |= CONTROL_RTS;
1306 control |= CONTROL_WRITE_RTS;
1307 }
1308 if (set & TIOCM_DTR) {
1309 control |= CONTROL_DTR;
1310 control |= CONTROL_WRITE_DTR;
1311 }
1312 if (clear & TIOCM_RTS) {
1313 control &= ~CONTROL_RTS;
1314 control |= CONTROL_WRITE_RTS;
1315 }
1316 if (clear & TIOCM_DTR) {
1317 control &= ~CONTROL_DTR;
1318 control |= CONTROL_WRITE_DTR;
1319 }
1320
1321 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
1322
1323 return cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1324 }
1325
1326 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
1327 {
1328 if (on)
1329 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
1330 else
1331 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
1332 }
1333
1334 static int cp210x_tiocmget(struct tty_struct *tty)
1335 {
1336 struct usb_serial_port *port = tty->driver_data;
1337 u8 control;
1338 int result;
1339
1340 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1341 if (result)
1342 return result;
1343
1344 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1345 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1346 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1347 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1348 |((control & CONTROL_RING)? TIOCM_RI : 0)
1349 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
1350
1351 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
1352
1353 return result;
1354 }
1355
1356 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1357 {
1358 struct usb_serial_port *port = tty->driver_data;
1359 u16 state;
1360
1361 if (break_state == 0)
1362 state = BREAK_OFF;
1363 else
1364 state = BREAK_ON;
1365 dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1366 state == BREAK_OFF ? "off" : "on");
1367 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1368 }
1369
1370 #ifdef CONFIG_GPIOLIB
1371 static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset)
1372 {
1373 struct usb_serial *serial = gpiochip_get_data(gc);
1374 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1375
1376 if (priv->gpio_altfunc & BIT(offset))
1377 return -ENODEV;
1378
1379 return 0;
1380 }
1381
1382 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1383 {
1384 struct usb_serial *serial = gpiochip_get_data(gc);
1385 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1386 u8 req_type = REQTYPE_DEVICE_TO_HOST;
1387 int result;
1388 u8 buf;
1389
1390 if (priv->partnum == CP210X_PARTNUM_CP2105)
1391 req_type = REQTYPE_INTERFACE_TO_HOST;
1392
1393 result = usb_autopm_get_interface(serial->interface);
1394 if (result)
1395 return result;
1396
1397 result = cp210x_read_vendor_block(serial, req_type,
1398 CP210X_READ_LATCH, &buf, sizeof(buf));
1399 usb_autopm_put_interface(serial->interface);
1400 if (result < 0)
1401 return result;
1402
1403 return !!(buf & BIT(gpio));
1404 }
1405
1406 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1407 {
1408 struct usb_serial *serial = gpiochip_get_data(gc);
1409 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1410 struct cp210x_gpio_write buf;
1411 int result;
1412
1413 if (value == 1)
1414 buf.state = BIT(gpio);
1415 else
1416 buf.state = 0;
1417
1418 buf.mask = BIT(gpio);
1419
1420 result = usb_autopm_get_interface(serial->interface);
1421 if (result)
1422 goto out;
1423
1424 if (priv->partnum == CP210X_PARTNUM_CP2105) {
1425 result = cp210x_write_vendor_block(serial,
1426 REQTYPE_HOST_TO_INTERFACE,
1427 CP210X_WRITE_LATCH, &buf,
1428 sizeof(buf));
1429 } else {
1430 u16 wIndex = buf.state << 8 | buf.mask;
1431
1432 result = usb_control_msg(serial->dev,
1433 usb_sndctrlpipe(serial->dev, 0),
1434 CP210X_VENDOR_SPECIFIC,
1435 REQTYPE_HOST_TO_DEVICE,
1436 CP210X_WRITE_LATCH,
1437 wIndex,
1438 NULL, 0, USB_CTRL_SET_TIMEOUT);
1439 }
1440
1441 usb_autopm_put_interface(serial->interface);
1442 out:
1443 if (result < 0) {
1444 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n",
1445 result);
1446 }
1447 }
1448
1449 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1450 {
1451 struct usb_serial *serial = gpiochip_get_data(gc);
1452 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1453
1454 return priv->gpio_input & BIT(gpio);
1455 }
1456
1457 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
1458 {
1459 struct usb_serial *serial = gpiochip_get_data(gc);
1460 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1461
1462 if (priv->partnum == CP210X_PARTNUM_CP2105) {
1463 /* hardware does not support an input mode */
1464 return -ENOTSUPP;
1465 }
1466
1467 /* push-pull pins cannot be changed to be inputs */
1468 if (priv->gpio_pushpull & BIT(gpio))
1469 return -EINVAL;
1470
1471 /* make sure to release pin if it is being driven low */
1472 cp210x_gpio_set(gc, gpio, 1);
1473
1474 priv->gpio_input |= BIT(gpio);
1475
1476 return 0;
1477 }
1478
1479 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1480 int value)
1481 {
1482 struct usb_serial *serial = gpiochip_get_data(gc);
1483 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1484
1485 priv->gpio_input &= ~BIT(gpio);
1486 cp210x_gpio_set(gc, gpio, value);
1487
1488 return 0;
1489 }
1490
1491 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
1492 unsigned long config)
1493 {
1494 struct usb_serial *serial = gpiochip_get_data(gc);
1495 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1496 enum pin_config_param param = pinconf_to_config_param(config);
1497
1498 /* Succeed only if in correct mode (this can't be set at runtime) */
1499 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) &&
1500 (priv->gpio_pushpull & BIT(gpio)))
1501 return 0;
1502
1503 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) &&
1504 !(priv->gpio_pushpull & BIT(gpio)))
1505 return 0;
1506
1507 return -ENOTSUPP;
1508 }
1509
1510 /*
1511 * This function is for configuring GPIO using shared pins, where other signals
1512 * are made unavailable by configuring the use of GPIO. This is believed to be
1513 * only applicable to the cp2105 at this point, the other devices supported by
1514 * this driver that provide GPIO do so in a way that does not impact other
1515 * signals and are thus expected to have very different initialisation.
1516 */
1517 static int cp2105_gpioconf_init(struct usb_serial *serial)
1518 {
1519 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1520 struct cp210x_pin_mode mode;
1521 struct cp210x_dual_port_config config;
1522 u8 intf_num = cp210x_interface_num(serial);
1523 u8 iface_config;
1524 int result;
1525
1526 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1527 CP210X_GET_DEVICEMODE, &mode,
1528 sizeof(mode));
1529 if (result < 0)
1530 return result;
1531
1532 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1533 CP210X_GET_PORTCONFIG, &config,
1534 sizeof(config));
1535 if (result < 0)
1536 return result;
1537
1538 /* 2 banks of GPIO - One for the pins taken from each serial port */
1539 if (intf_num == 0) {
1540 if (mode.eci == CP210X_PIN_MODE_MODEM) {
1541 /* mark all GPIOs of this interface as reserved */
1542 priv->gpio_altfunc = 0xff;
1543 return 0;
1544 }
1545
1546 iface_config = config.eci_cfg;
1547 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1548 CP210X_ECI_GPIO_MODE_MASK) >>
1549 CP210X_ECI_GPIO_MODE_OFFSET);
1550 priv->gc.ngpio = 2;
1551 } else if (intf_num == 1) {
1552 if (mode.sci == CP210X_PIN_MODE_MODEM) {
1553 /* mark all GPIOs of this interface as reserved */
1554 priv->gpio_altfunc = 0xff;
1555 return 0;
1556 }
1557
1558 iface_config = config.sci_cfg;
1559 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1560 CP210X_SCI_GPIO_MODE_MASK) >>
1561 CP210X_SCI_GPIO_MODE_OFFSET);
1562 priv->gc.ngpio = 3;
1563 } else {
1564 return -ENODEV;
1565 }
1566
1567 /* mark all pins which are not in GPIO mode */
1568 if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */
1569 priv->gpio_altfunc |= BIT(0);
1570 if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */
1571 CP2105_GPIO1_RS485_MODE))
1572 priv->gpio_altfunc |= BIT(1);
1573
1574 /* driver implementation for CP2105 only supports outputs */
1575 priv->gpio_input = 0;
1576
1577 return 0;
1578 }
1579
1580 static int cp2104_gpioconf_init(struct usb_serial *serial)
1581 {
1582 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1583 struct cp210x_single_port_config config;
1584 u8 iface_config;
1585 u8 gpio_latch;
1586 int result;
1587 u8 i;
1588
1589 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1590 CP210X_GET_PORTCONFIG, &config,
1591 sizeof(config));
1592 if (result < 0)
1593 return result;
1594
1595 priv->gc.ngpio = 4;
1596
1597 iface_config = config.device_cfg;
1598 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1599 CP210X_GPIO_MODE_MASK) >>
1600 CP210X_GPIO_MODE_OFFSET);
1601 gpio_latch = (u8)((le16_to_cpu(config.reset_state) &
1602 CP210X_GPIO_MODE_MASK) >>
1603 CP210X_GPIO_MODE_OFFSET);
1604
1605 /* mark all pins which are not in GPIO mode */
1606 if (iface_config & CP2104_GPIO0_TXLED_MODE) /* GPIO 0 */
1607 priv->gpio_altfunc |= BIT(0);
1608 if (iface_config & CP2104_GPIO1_RXLED_MODE) /* GPIO 1 */
1609 priv->gpio_altfunc |= BIT(1);
1610 if (iface_config & CP2104_GPIO2_RS485_MODE) /* GPIO 2 */
1611 priv->gpio_altfunc |= BIT(2);
1612
1613 /*
1614 * Like CP2102N, CP2104 has also no strict input and output pin
1615 * modes.
1616 * Do the same input mode emulation as CP2102N.
1617 */
1618 for (i = 0; i < priv->gc.ngpio; ++i) {
1619 /*
1620 * Set direction to "input" iff pin is open-drain and reset
1621 * value is 1.
1622 */
1623 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1624 priv->gpio_input |= BIT(i);
1625 }
1626
1627 return 0;
1628 }
1629
1630 static int cp2102n_gpioconf_init(struct usb_serial *serial)
1631 {
1632 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1633 const u16 config_size = 0x02a6;
1634 u8 gpio_rst_latch;
1635 u8 config_version;
1636 u8 gpio_pushpull;
1637 u8 *config_buf;
1638 u8 gpio_latch;
1639 u8 gpio_ctrl;
1640 int result;
1641 u8 i;
1642
1643 /*
1644 * Retrieve device configuration from the device.
1645 * The array received contains all customization settings done at the
1646 * factory/manufacturer. Format of the array is documented at the
1647 * time of writing at:
1648 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa
1649 */
1650 config_buf = kmalloc(config_size, GFP_KERNEL);
1651 if (!config_buf)
1652 return -ENOMEM;
1653
1654 result = cp210x_read_vendor_block(serial,
1655 REQTYPE_DEVICE_TO_HOST,
1656 CP210X_READ_2NCONFIG,
1657 config_buf,
1658 config_size);
1659 if (result < 0) {
1660 kfree(config_buf);
1661 return result;
1662 }
1663
1664 config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX];
1665 gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX];
1666 gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX];
1667 gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX];
1668
1669 kfree(config_buf);
1670
1671 /* Make sure this is a config format we understand. */
1672 if (config_version != 0x01)
1673 return -ENOTSUPP;
1674
1675 priv->gc.ngpio = 4;
1676
1677 /*
1678 * Get default pin states after reset. Needed so we can determine
1679 * the direction of an open-drain pin.
1680 */
1681 gpio_latch = (gpio_rst_latch >> 3) & 0x0f;
1682
1683 /* 0 indicates open-drain mode, 1 is push-pull */
1684 priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f;
1685
1686 /* 0 indicates GPIO mode, 1 is alternate function */
1687 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f;
1688
1689 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) {
1690 /*
1691 * For the QFN28 package, GPIO4-6 are controlled by
1692 * the low three bits of the mode/latch fields.
1693 * Contrary to the document linked above, the bits for
1694 * the SUSPEND pins are elsewhere. No alternate
1695 * function is available for these pins.
1696 */
1697 priv->gc.ngpio = 7;
1698 gpio_latch |= (gpio_rst_latch & 7) << 4;
1699 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4;
1700 }
1701
1702 /*
1703 * The CP2102N does not strictly has input and output pin modes,
1704 * it only knows open-drain and push-pull modes which is set at
1705 * factory. An open-drain pin can function both as an
1706 * input or an output. We emulate input mode for open-drain pins
1707 * by making sure they are not driven low, and we do not allow
1708 * push-pull pins to be set as an input.
1709 */
1710 for (i = 0; i < priv->gc.ngpio; ++i) {
1711 /*
1712 * Set direction to "input" iff pin is open-drain and reset
1713 * value is 1.
1714 */
1715 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1716 priv->gpio_input |= BIT(i);
1717 }
1718
1719 return 0;
1720 }
1721
1722 static int cp210x_gpio_init(struct usb_serial *serial)
1723 {
1724 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1725 int result;
1726
1727 switch (priv->partnum) {
1728 case CP210X_PARTNUM_CP2104:
1729 result = cp2104_gpioconf_init(serial);
1730 break;
1731 case CP210X_PARTNUM_CP2105:
1732 result = cp2105_gpioconf_init(serial);
1733 break;
1734 case CP210X_PARTNUM_CP2102N_QFN28:
1735 case CP210X_PARTNUM_CP2102N_QFN24:
1736 case CP210X_PARTNUM_CP2102N_QFN20:
1737 result = cp2102n_gpioconf_init(serial);
1738 break;
1739 default:
1740 return 0;
1741 }
1742
1743 if (result < 0)
1744 return result;
1745
1746 priv->gc.label = "cp210x";
1747 priv->gc.request = cp210x_gpio_request;
1748 priv->gc.get_direction = cp210x_gpio_direction_get;
1749 priv->gc.direction_input = cp210x_gpio_direction_input;
1750 priv->gc.direction_output = cp210x_gpio_direction_output;
1751 priv->gc.get = cp210x_gpio_get;
1752 priv->gc.set = cp210x_gpio_set;
1753 priv->gc.set_config = cp210x_gpio_set_config;
1754 priv->gc.owner = THIS_MODULE;
1755 priv->gc.parent = &serial->interface->dev;
1756 priv->gc.base = -1;
1757 priv->gc.can_sleep = true;
1758
1759 result = gpiochip_add_data(&priv->gc, serial);
1760 if (!result)
1761 priv->gpio_registered = true;
1762
1763 return result;
1764 }
1765
1766 static void cp210x_gpio_remove(struct usb_serial *serial)
1767 {
1768 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1769
1770 if (priv->gpio_registered) {
1771 gpiochip_remove(&priv->gc);
1772 priv->gpio_registered = false;
1773 }
1774 }
1775
1776 #else
1777
1778 static int cp210x_gpio_init(struct usb_serial *serial)
1779 {
1780 return 0;
1781 }
1782
1783 static void cp210x_gpio_remove(struct usb_serial *serial)
1784 {
1785 /* Nothing to do */
1786 }
1787
1788 #endif
1789
1790 static int cp210x_port_probe(struct usb_serial_port *port)
1791 {
1792 struct usb_serial *serial = port->serial;
1793 struct cp210x_port_private *port_priv;
1794 int ret;
1795
1796 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1797 if (!port_priv)
1798 return -ENOMEM;
1799
1800 port_priv->bInterfaceNumber = cp210x_interface_num(serial);
1801
1802 usb_set_serial_port_data(port, port_priv);
1803
1804 ret = cp210x_detect_swapped_line_ctl(port);
1805 if (ret) {
1806 kfree(port_priv);
1807 return ret;
1808 }
1809
1810 return 0;
1811 }
1812
1813 static int cp210x_port_remove(struct usb_serial_port *port)
1814 {
1815 struct cp210x_port_private *port_priv;
1816
1817 port_priv = usb_get_serial_port_data(port);
1818 kfree(port_priv);
1819
1820 return 0;
1821 }
1822
1823 static void cp210x_init_max_speed(struct usb_serial *serial)
1824 {
1825 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1826 bool use_actual_rate = false;
1827 speed_t min = 300;
1828 speed_t max;
1829
1830 switch (priv->partnum) {
1831 case CP210X_PARTNUM_CP2101:
1832 max = 921600;
1833 break;
1834 case CP210X_PARTNUM_CP2102:
1835 case CP210X_PARTNUM_CP2103:
1836 max = 1000000;
1837 break;
1838 case CP210X_PARTNUM_CP2104:
1839 use_actual_rate = true;
1840 max = 2000000;
1841 break;
1842 case CP210X_PARTNUM_CP2108:
1843 max = 2000000;
1844 break;
1845 case CP210X_PARTNUM_CP2105:
1846 if (cp210x_interface_num(serial) == 0) {
1847 use_actual_rate = true;
1848 max = 2000000; /* ECI */
1849 } else {
1850 min = 2400;
1851 max = 921600; /* SCI */
1852 }
1853 break;
1854 case CP210X_PARTNUM_CP2102N_QFN28:
1855 case CP210X_PARTNUM_CP2102N_QFN24:
1856 case CP210X_PARTNUM_CP2102N_QFN20:
1857 use_actual_rate = true;
1858 max = 3000000;
1859 break;
1860 default:
1861 max = 2000000;
1862 break;
1863 }
1864
1865 priv->min_speed = min;
1866 priv->max_speed = max;
1867 priv->use_actual_rate = use_actual_rate;
1868 }
1869
1870 static int cp210x_attach(struct usb_serial *serial)
1871 {
1872 int result;
1873 struct cp210x_serial_private *priv;
1874
1875 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1876 if (!priv)
1877 return -ENOMEM;
1878
1879 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1880 CP210X_GET_PARTNUM, &priv->partnum,
1881 sizeof(priv->partnum));
1882 if (result < 0) {
1883 dev_warn(&serial->interface->dev,
1884 "querying part number failed\n");
1885 priv->partnum = CP210X_PARTNUM_UNKNOWN;
1886 }
1887
1888 usb_set_serial_data(serial, priv);
1889
1890 cp210x_init_max_speed(serial);
1891
1892 result = cp210x_gpio_init(serial);
1893 if (result < 0) {
1894 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n",
1895 result);
1896 }
1897
1898 return 0;
1899 }
1900
1901 static void cp210x_disconnect(struct usb_serial *serial)
1902 {
1903 cp210x_gpio_remove(serial);
1904 }
1905
1906 static void cp210x_release(struct usb_serial *serial)
1907 {
1908 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1909
1910 cp210x_gpio_remove(serial);
1911
1912 kfree(priv);
1913 }
1914
1915 module_usb_serial_driver(serial_drivers, id_table);
1916
1917 MODULE_DESCRIPTION(DRIVER_DESC);
1918 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support