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Merge tag 'regmap-fix-v5.11-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux/fpc-iii.git] / drivers / usb / serial / cp210x.c
blobfbb10dfc56e3184a44277a16a5dc7c1d074a2127
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_change_speed(struct tty_struct *, struct usb_serial_port *,
35 struct ktermios *);
36 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
37 struct ktermios*);
38 static bool cp210x_tx_empty(struct usb_serial_port *port);
39 static int cp210x_tiocmget(struct tty_struct *);
40 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
41 static int cp210x_tiocmset_port(struct usb_serial_port *port,
42 unsigned int, unsigned int);
43 static void cp210x_break_ctl(struct tty_struct *, int);
44 static int cp210x_attach(struct usb_serial *);
45 static void cp210x_disconnect(struct usb_serial *);
46 static void cp210x_release(struct usb_serial *);
47 static int cp210x_port_probe(struct usb_serial_port *);
48 static int cp210x_port_remove(struct usb_serial_port *);
49 static void cp210x_dtr_rts(struct usb_serial_port *port, int on);
50 static void cp210x_process_read_urb(struct urb *urb);
51 static void cp210x_enable_event_mode(struct usb_serial_port *port);
52 static void cp210x_disable_event_mode(struct usb_serial_port *port);
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 enum cp210x_event_state {
257 ES_DATA,
258 ES_ESCAPE,
259 ES_LSR,
260 ES_LSR_DATA_0,
261 ES_LSR_DATA_1,
262 ES_MSR
263 };
264
265 struct cp210x_port_private {
266 u8 bInterfaceNumber;
267 bool event_mode;
268 enum cp210x_event_state event_state;
269 u8 lsr;
270 };
271
272 static struct usb_serial_driver cp210x_device = {
273 .driver = {
274 .owner = THIS_MODULE,
275 .name = "cp210x",
276 },
277 .id_table = id_table,
278 .num_ports = 1,
279 .bulk_in_size = 256,
280 .bulk_out_size = 256,
281 .open = cp210x_open,
282 .close = cp210x_close,
283 .break_ctl = cp210x_break_ctl,
284 .set_termios = cp210x_set_termios,
285 .tx_empty = cp210x_tx_empty,
286 .throttle = usb_serial_generic_throttle,
287 .unthrottle = usb_serial_generic_unthrottle,
288 .tiocmget = cp210x_tiocmget,
289 .tiocmset = cp210x_tiocmset,
290 .get_icount = usb_serial_generic_get_icount,
291 .attach = cp210x_attach,
292 .disconnect = cp210x_disconnect,
293 .release = cp210x_release,
294 .port_probe = cp210x_port_probe,
295 .port_remove = cp210x_port_remove,
296 .dtr_rts = cp210x_dtr_rts,
297 .process_read_urb = cp210x_process_read_urb,
298 };
299
300 static struct usb_serial_driver * const serial_drivers[] = {
301 &cp210x_device, NULL
302 };
303
304 /* Config request types */
305 #define REQTYPE_HOST_TO_INTERFACE 0x41
306 #define REQTYPE_INTERFACE_TO_HOST 0xc1
307 #define REQTYPE_HOST_TO_DEVICE 0x40
308 #define REQTYPE_DEVICE_TO_HOST 0xc0
309
310 /* Config request codes */
311 #define CP210X_IFC_ENABLE 0x00
312 #define CP210X_SET_BAUDDIV 0x01
313 #define CP210X_GET_BAUDDIV 0x02
314 #define CP210X_SET_LINE_CTL 0x03
315 #define CP210X_GET_LINE_CTL 0x04
316 #define CP210X_SET_BREAK 0x05
317 #define CP210X_IMM_CHAR 0x06
318 #define CP210X_SET_MHS 0x07
319 #define CP210X_GET_MDMSTS 0x08
320 #define CP210X_SET_XON 0x09
321 #define CP210X_SET_XOFF 0x0A
322 #define CP210X_SET_EVENTMASK 0x0B
323 #define CP210X_GET_EVENTMASK 0x0C
324 #define CP210X_SET_CHAR 0x0D
325 #define CP210X_GET_CHARS 0x0E
326 #define CP210X_GET_PROPS 0x0F
327 #define CP210X_GET_COMM_STATUS 0x10
328 #define CP210X_RESET 0x11
329 #define CP210X_PURGE 0x12
330 #define CP210X_SET_FLOW 0x13
331 #define CP210X_GET_FLOW 0x14
332 #define CP210X_EMBED_EVENTS 0x15
333 #define CP210X_GET_EVENTSTATE 0x16
334 #define CP210X_SET_CHARS 0x19
335 #define CP210X_GET_BAUDRATE 0x1D
336 #define CP210X_SET_BAUDRATE 0x1E
337 #define CP210X_VENDOR_SPECIFIC 0xFF
338
339 /* CP210X_IFC_ENABLE */
340 #define UART_ENABLE 0x0001
341 #define UART_DISABLE 0x0000
342
343 /* CP210X_(SET|GET)_BAUDDIV */
344 #define BAUD_RATE_GEN_FREQ 0x384000
345
346 /* CP210X_(SET|GET)_LINE_CTL */
347 #define BITS_DATA_MASK 0X0f00
348 #define BITS_DATA_5 0X0500
349 #define BITS_DATA_6 0X0600
350 #define BITS_DATA_7 0X0700
351 #define BITS_DATA_8 0X0800
352 #define BITS_DATA_9 0X0900
353
354 #define BITS_PARITY_MASK 0x00f0
355 #define BITS_PARITY_NONE 0x0000
356 #define BITS_PARITY_ODD 0x0010
357 #define BITS_PARITY_EVEN 0x0020
358 #define BITS_PARITY_MARK 0x0030
359 #define BITS_PARITY_SPACE 0x0040
360
361 #define BITS_STOP_MASK 0x000f
362 #define BITS_STOP_1 0x0000
363 #define BITS_STOP_1_5 0x0001
364 #define BITS_STOP_2 0x0002
365
366 /* CP210X_SET_BREAK */
367 #define BREAK_ON 0x0001
368 #define BREAK_OFF 0x0000
369
370 /* CP210X_(SET_MHS|GET_MDMSTS) */
371 #define CONTROL_DTR 0x0001
372 #define CONTROL_RTS 0x0002
373 #define CONTROL_CTS 0x0010
374 #define CONTROL_DSR 0x0020
375 #define CONTROL_RING 0x0040
376 #define CONTROL_DCD 0x0080
377 #define CONTROL_WRITE_DTR 0x0100
378 #define CONTROL_WRITE_RTS 0x0200
379
380 /* CP210X_VENDOR_SPECIFIC values */
381 #define CP210X_READ_2NCONFIG 0x000E
382 #define CP210X_READ_LATCH 0x00C2
383 #define CP210X_GET_PARTNUM 0x370B
384 #define CP210X_GET_PORTCONFIG 0x370C
385 #define CP210X_GET_DEVICEMODE 0x3711
386 #define CP210X_WRITE_LATCH 0x37E1
387
388 /* Part number definitions */
389 #define CP210X_PARTNUM_CP2101 0x01
390 #define CP210X_PARTNUM_CP2102 0x02
391 #define CP210X_PARTNUM_CP2103 0x03
392 #define CP210X_PARTNUM_CP2104 0x04
393 #define CP210X_PARTNUM_CP2105 0x05
394 #define CP210X_PARTNUM_CP2108 0x08
395 #define CP210X_PARTNUM_CP2102N_QFN28 0x20
396 #define CP210X_PARTNUM_CP2102N_QFN24 0x21
397 #define CP210X_PARTNUM_CP2102N_QFN20 0x22
398 #define CP210X_PARTNUM_UNKNOWN 0xFF
399
400 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
401 struct cp210x_comm_status {
402 __le32 ulErrors;
403 __le32 ulHoldReasons;
404 __le32 ulAmountInInQueue;
405 __le32 ulAmountInOutQueue;
406 u8 bEofReceived;
407 u8 bWaitForImmediate;
408 u8 bReserved;
409 } __packed;
410
411 /*
412 * CP210X_PURGE - 16 bits passed in wValue of USB request.
413 * SiLabs app note AN571 gives a strange description of the 4 bits:
414 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
415 * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
416 */
417 #define PURGE_ALL 0x000f
418
419 /* CP210X_EMBED_EVENTS */
420 #define CP210X_ESCCHAR 0xec
421
422 #define CP210X_LSR_OVERRUN BIT(1)
423 #define CP210X_LSR_PARITY BIT(2)
424 #define CP210X_LSR_FRAME BIT(3)
425 #define CP210X_LSR_BREAK BIT(4)
426
427
428 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
429 struct cp210x_flow_ctl {
430 __le32 ulControlHandshake;
431 __le32 ulFlowReplace;
432 __le32 ulXonLimit;
433 __le32 ulXoffLimit;
434 };
435
436 /* cp210x_flow_ctl::ulControlHandshake */
437 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0)
438 #define CP210X_SERIAL_DTR_SHIFT(_mode) (_mode)
439 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3)
440 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4)
441 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5)
442 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6)
443
444 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */
445 #define CP210X_SERIAL_DTR_INACTIVE 0
446 #define CP210X_SERIAL_DTR_ACTIVE 1
447 #define CP210X_SERIAL_DTR_FLOW_CTL 2
448
449 /* cp210x_flow_ctl::ulFlowReplace */
450 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0)
451 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1)
452 #define CP210X_SERIAL_ERROR_CHAR BIT(2)
453 #define CP210X_SERIAL_NULL_STRIPPING BIT(3)
454 #define CP210X_SERIAL_BREAK_CHAR BIT(4)
455 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6)
456 #define CP210X_SERIAL_RTS_SHIFT(_mode) (_mode << 6)
457 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31)
458
459 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */
460 #define CP210X_SERIAL_RTS_INACTIVE 0
461 #define CP210X_SERIAL_RTS_ACTIVE 1
462 #define CP210X_SERIAL_RTS_FLOW_CTL 2
463
464 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
465 struct cp210x_pin_mode {
466 u8 eci;
467 u8 sci;
468 };
469
470 #define CP210X_PIN_MODE_MODEM 0
471 #define CP210X_PIN_MODE_GPIO BIT(0)
472
473 /*
474 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes
475 * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes.
476 */
477 struct cp210x_dual_port_config {
478 __le16 gpio_mode;
479 u8 __pad0[2];
480 __le16 reset_state;
481 u8 __pad1[4];
482 __le16 suspend_state;
483 u8 sci_cfg;
484 u8 eci_cfg;
485 u8 device_cfg;
486 } __packed;
487
488 /*
489 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes
490 * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes.
491 */
492 struct cp210x_single_port_config {
493 __le16 gpio_mode;
494 u8 __pad0[2];
495 __le16 reset_state;
496 u8 __pad1[4];
497 __le16 suspend_state;
498 u8 device_cfg;
499 } __packed;
500
501 /* GPIO modes */
502 #define CP210X_SCI_GPIO_MODE_OFFSET 9
503 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9)
504
505 #define CP210X_ECI_GPIO_MODE_OFFSET 2
506 #define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2)
507
508 #define CP210X_GPIO_MODE_OFFSET 8
509 #define CP210X_GPIO_MODE_MASK GENMASK(11, 8)
510
511 /* CP2105 port configuration values */
512 #define CP2105_GPIO0_TXLED_MODE BIT(0)
513 #define CP2105_GPIO1_RXLED_MODE BIT(1)
514 #define CP2105_GPIO1_RS485_MODE BIT(2)
515
516 /* CP2104 port configuration values */
517 #define CP2104_GPIO0_TXLED_MODE BIT(0)
518 #define CP2104_GPIO1_RXLED_MODE BIT(1)
519 #define CP2104_GPIO2_RS485_MODE BIT(2)
520
521 /* CP2102N configuration array indices */
522 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX 2
523 #define CP210X_2NCONFIG_GPIO_MODE_IDX 581
524 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587
525 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600
526
527 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */
528 struct cp210x_gpio_write {
529 u8 mask;
530 u8 state;
531 };
532
533 /*
534 * Helper to get interface number when we only have struct usb_serial.
535 */
536 static u8 cp210x_interface_num(struct usb_serial *serial)
537 {
538 struct usb_host_interface *cur_altsetting;
539
540 cur_altsetting = serial->interface->cur_altsetting;
541
542 return cur_altsetting->desc.bInterfaceNumber;
543 }
544
545 /*
546 * Reads a variable-sized block of CP210X_ registers, identified by req.
547 * Returns data into buf in native USB byte order.
548 */
549 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
550 void *buf, int bufsize)
551 {
552 struct usb_serial *serial = port->serial;
553 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
554 void *dmabuf;
555 int result;
556
557 dmabuf = kmalloc(bufsize, GFP_KERNEL);
558 if (!dmabuf)
559 return -ENOMEM;
560
561 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
562 req, REQTYPE_INTERFACE_TO_HOST, 0,
563 port_priv->bInterfaceNumber, dmabuf, bufsize,
564 USB_CTRL_SET_TIMEOUT);
565 if (result == bufsize) {
566 memcpy(buf, dmabuf, bufsize);
567 result = 0;
568 } else {
569 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
570 req, bufsize, result);
571 if (result >= 0)
572 result = -EIO;
573 }
574
575 kfree(dmabuf);
576
577 return result;
578 }
579
580 /*
581 * Reads any 8-bit CP210X_ register identified by req.
582 */
583 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
584 {
585 return cp210x_read_reg_block(port, req, val, sizeof(*val));
586 }
587
588 /*
589 * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
590 * Returns data into buf in native USB byte order.
591 */
592 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
593 void *buf, int bufsize)
594 {
595 void *dmabuf;
596 int result;
597
598 dmabuf = kmalloc(bufsize, GFP_KERNEL);
599 if (!dmabuf)
600 return -ENOMEM;
601
602 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
603 CP210X_VENDOR_SPECIFIC, type, val,
604 cp210x_interface_num(serial), dmabuf, bufsize,
605 USB_CTRL_GET_TIMEOUT);
606 if (result == bufsize) {
607 memcpy(buf, dmabuf, bufsize);
608 result = 0;
609 } else {
610 dev_err(&serial->interface->dev,
611 "failed to get vendor val 0x%04x size %d: %d\n", val,
612 bufsize, result);
613 if (result >= 0)
614 result = -EIO;
615 }
616
617 kfree(dmabuf);
618
619 return result;
620 }
621
622 /*
623 * Writes any 16-bit CP210X_ register (req) whose value is passed
624 * entirely in the wValue field of the USB request.
625 */
626 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
627 {
628 struct usb_serial *serial = port->serial;
629 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
630 int result;
631
632 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
633 req, REQTYPE_HOST_TO_INTERFACE, val,
634 port_priv->bInterfaceNumber, NULL, 0,
635 USB_CTRL_SET_TIMEOUT);
636 if (result < 0) {
637 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
638 req, result);
639 }
640
641 return result;
642 }
643
644 /*
645 * Writes a variable-sized block of CP210X_ registers, identified by req.
646 * Data in buf must be in native USB byte order.
647 */
648 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
649 void *buf, int bufsize)
650 {
651 struct usb_serial *serial = port->serial;
652 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
653 void *dmabuf;
654 int result;
655
656 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
657 if (!dmabuf)
658 return -ENOMEM;
659
660 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
661 req, REQTYPE_HOST_TO_INTERFACE, 0,
662 port_priv->bInterfaceNumber, dmabuf, bufsize,
663 USB_CTRL_SET_TIMEOUT);
664
665 kfree(dmabuf);
666
667 if (result == bufsize) {
668 result = 0;
669 } else {
670 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
671 req, bufsize, result);
672 if (result >= 0)
673 result = -EIO;
674 }
675
676 return result;
677 }
678
679 /*
680 * Writes any 32-bit CP210X_ register identified by req.
681 */
682 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
683 {
684 __le32 le32_val;
685
686 le32_val = cpu_to_le32(val);
687
688 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
689 }
690
691 #ifdef CONFIG_GPIOLIB
692 /*
693 * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
694 * Data in buf must be in native USB byte order.
695 */
696 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
697 u16 val, void *buf, int bufsize)
698 {
699 void *dmabuf;
700 int result;
701
702 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
703 if (!dmabuf)
704 return -ENOMEM;
705
706 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
707 CP210X_VENDOR_SPECIFIC, type, val,
708 cp210x_interface_num(serial), dmabuf, bufsize,
709 USB_CTRL_SET_TIMEOUT);
710
711 kfree(dmabuf);
712
713 if (result == bufsize) {
714 result = 0;
715 } else {
716 dev_err(&serial->interface->dev,
717 "failed to set vendor val 0x%04x size %d: %d\n", val,
718 bufsize, result);
719 if (result >= 0)
720 result = -EIO;
721 }
722
723 return result;
724 }
725 #endif
726
727 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
728 {
729 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
730 int result;
731
732 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
733 if (result) {
734 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
735 return result;
736 }
737
738 if (tty)
739 cp210x_set_termios(tty, port, NULL);
740
741 result = usb_serial_generic_open(tty, port);
742 if (result)
743 goto err_disable;
744
745 return 0;
746
747 err_disable:
748 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
749 port_priv->event_mode = false;
750
751 return result;
752 }
753
754 static void cp210x_close(struct usb_serial_port *port)
755 {
756 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
757
758 usb_serial_generic_close(port);
759
760 /* Clear both queues; cp2108 needs this to avoid an occasional hang */
761 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
762
763 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
764
765 /* Disabling the interface disables event-insertion mode. */
766 port_priv->event_mode = false;
767 }
768
769 static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag)
770 {
771 if (lsr & CP210X_LSR_BREAK) {
772 port->icount.brk++;
773 *flag = TTY_BREAK;
774 } else if (lsr & CP210X_LSR_PARITY) {
775 port->icount.parity++;
776 *flag = TTY_PARITY;
777 } else if (lsr & CP210X_LSR_FRAME) {
778 port->icount.frame++;
779 *flag = TTY_FRAME;
780 }
781
782 if (lsr & CP210X_LSR_OVERRUN) {
783 port->icount.overrun++;
784 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
785 }
786 }
787
788 static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag)
789 {
790 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
791
792 switch (port_priv->event_state) {
793 case ES_DATA:
794 if (*ch == CP210X_ESCCHAR) {
795 port_priv->event_state = ES_ESCAPE;
796 break;
797 }
798 return false;
799 case ES_ESCAPE:
800 switch (*ch) {
801 case 0:
802 dev_dbg(&port->dev, "%s - escape char\n", __func__);
803 *ch = CP210X_ESCCHAR;
804 port_priv->event_state = ES_DATA;
805 return false;
806 case 1:
807 port_priv->event_state = ES_LSR_DATA_0;
808 break;
809 case 2:
810 port_priv->event_state = ES_LSR;
811 break;
812 case 3:
813 port_priv->event_state = ES_MSR;
814 break;
815 default:
816 dev_err(&port->dev, "malformed event 0x%02x\n", *ch);
817 port_priv->event_state = ES_DATA;
818 break;
819 }
820 break;
821 case ES_LSR_DATA_0:
822 port_priv->lsr = *ch;
823 port_priv->event_state = ES_LSR_DATA_1;
824 break;
825 case ES_LSR_DATA_1:
826 dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n",
827 __func__, port_priv->lsr, *ch);
828 cp210x_process_lsr(port, port_priv->lsr, flag);
829 port_priv->event_state = ES_DATA;
830 return false;
831 case ES_LSR:
832 dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch);
833 port_priv->lsr = *ch;
834 cp210x_process_lsr(port, port_priv->lsr, flag);
835 port_priv->event_state = ES_DATA;
836 break;
837 case ES_MSR:
838 dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch);
839 /* unimplemented */
840 port_priv->event_state = ES_DATA;
841 break;
842 }
843
844 return true;
845 }
846
847 static void cp210x_process_read_urb(struct urb *urb)
848 {
849 struct usb_serial_port *port = urb->context;
850 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
851 unsigned char *ch = urb->transfer_buffer;
852 char flag;
853 int i;
854
855 if (!urb->actual_length)
856 return;
857
858 if (port_priv->event_mode) {
859 for (i = 0; i < urb->actual_length; i++, ch++) {
860 flag = TTY_NORMAL;
861
862 if (cp210x_process_char(port, ch, &flag))
863 continue;
864
865 tty_insert_flip_char(&port->port, *ch, flag);
866 }
867 } else {
868 tty_insert_flip_string(&port->port, ch, urb->actual_length);
869 }
870 tty_flip_buffer_push(&port->port);
871 }
872
873 /*
874 * Read how many bytes are waiting in the TX queue.
875 */
876 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
877 u32 *count)
878 {
879 struct usb_serial *serial = port->serial;
880 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
881 struct cp210x_comm_status *sts;
882 int result;
883
884 sts = kmalloc(sizeof(*sts), GFP_KERNEL);
885 if (!sts)
886 return -ENOMEM;
887
888 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
889 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
890 0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
891 USB_CTRL_GET_TIMEOUT);
892 if (result == sizeof(*sts)) {
893 *count = le32_to_cpu(sts->ulAmountInOutQueue);
894 result = 0;
895 } else {
896 dev_err(&port->dev, "failed to get comm status: %d\n", result);
897 if (result >= 0)
898 result = -EIO;
899 }
900
901 kfree(sts);
902
903 return result;
904 }
905
906 static bool cp210x_tx_empty(struct usb_serial_port *port)
907 {
908 int err;
909 u32 count;
910
911 err = cp210x_get_tx_queue_byte_count(port, &count);
912 if (err)
913 return true;
914
915 return !count;
916 }
917
918 struct cp210x_rate {
919 speed_t rate;
920 speed_t high;
921 };
922
923 static const struct cp210x_rate cp210x_an205_table1[] = {
924 { 300, 300 },
925 { 600, 600 },
926 { 1200, 1200 },
927 { 1800, 1800 },
928 { 2400, 2400 },
929 { 4000, 4000 },
930 { 4800, 4803 },
931 { 7200, 7207 },
932 { 9600, 9612 },
933 { 14400, 14428 },
934 { 16000, 16062 },
935 { 19200, 19250 },
936 { 28800, 28912 },
937 { 38400, 38601 },
938 { 51200, 51558 },
939 { 56000, 56280 },
940 { 57600, 58053 },
941 { 64000, 64111 },
942 { 76800, 77608 },
943 { 115200, 117028 },
944 { 128000, 129347 },
945 { 153600, 156868 },
946 { 230400, 237832 },
947 { 250000, 254234 },
948 { 256000, 273066 },
949 { 460800, 491520 },
950 { 500000, 567138 },
951 { 576000, 670254 },
952 { 921600, UINT_MAX }
953 };
954
955 /*
956 * Quantises the baud rate as per AN205 Table 1
957 */
958 static speed_t cp210x_get_an205_rate(speed_t baud)
959 {
960 int i;
961
962 for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) {
963 if (baud <= cp210x_an205_table1[i].high)
964 break;
965 }
966
967 return cp210x_an205_table1[i].rate;
968 }
969
970 static speed_t cp210x_get_actual_rate(speed_t baud)
971 {
972 unsigned int prescale = 1;
973 unsigned int div;
974
975 if (baud <= 365)
976 prescale = 4;
977
978 div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud);
979 baud = 48000000 / (2 * prescale * div);
980
981 return baud;
982 }
983
984 /*
985 * CP2101 supports the following baud rates:
986 *
987 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
988 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
989 *
990 * CP2102 and CP2103 support the following additional rates:
991 *
992 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
993 * 576000
994 *
995 * The device will map a requested rate to a supported one, but the result
996 * of requests for rates greater than 1053257 is undefined (see AN205).
997 *
998 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
999 * respectively, with an error less than 1%. The actual rates are determined
1000 * by
1001 *
1002 * div = round(freq / (2 x prescale x request))
1003 * actual = freq / (2 x prescale x div)
1004 *
1005 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1006 * or 1 otherwise.
1007 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1008 * otherwise.
1009 */
1010 static void cp210x_change_speed(struct tty_struct *tty,
1011 struct usb_serial_port *port, struct ktermios *old_termios)
1012 {
1013 struct usb_serial *serial = port->serial;
1014 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1015 u32 baud;
1016
1017 /*
1018 * This maps the requested rate to the actual rate, a valid rate on
1019 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed].
1020 *
1021 * NOTE: B0 is not implemented.
1022 */
1023 baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed);
1024
1025 if (priv->use_actual_rate)
1026 baud = cp210x_get_actual_rate(baud);
1027 else if (baud < 1000000)
1028 baud = cp210x_get_an205_rate(baud);
1029
1030 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1031 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1032 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1033 if (old_termios)
1034 baud = old_termios->c_ospeed;
1035 else
1036 baud = 9600;
1037 }
1038
1039 tty_encode_baud_rate(tty, baud, baud);
1040 }
1041
1042 static void cp210x_enable_event_mode(struct usb_serial_port *port)
1043 {
1044 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1045 int ret;
1046
1047 if (port_priv->event_mode)
1048 return;
1049
1050 port_priv->event_state = ES_DATA;
1051 port_priv->event_mode = true;
1052
1053 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR);
1054 if (ret) {
1055 dev_err(&port->dev, "failed to enable events: %d\n", ret);
1056 port_priv->event_mode = false;
1057 }
1058 }
1059
1060 static void cp210x_disable_event_mode(struct usb_serial_port *port)
1061 {
1062 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1063 int ret;
1064
1065 if (!port_priv->event_mode)
1066 return;
1067
1068 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0);
1069 if (ret) {
1070 dev_err(&port->dev, "failed to disable events: %d\n", ret);
1071 return;
1072 }
1073
1074 port_priv->event_mode = false;
1075 }
1076
1077 static bool cp210x_termios_change(const struct ktermios *a, const struct ktermios *b)
1078 {
1079 bool iflag_change;
1080
1081 iflag_change = ((a->c_iflag ^ b->c_iflag) & INPCK);
1082
1083 return tty_termios_hw_change(a, b) || iflag_change;
1084 }
1085
1086 static void cp210x_set_flow_control(struct tty_struct *tty,
1087 struct usb_serial_port *port, struct ktermios *old_termios)
1088 {
1089 struct cp210x_flow_ctl flow_ctl;
1090 u32 flow_repl;
1091 u32 ctl_hs;
1092 int ret;
1093
1094 if (old_termios && C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS))
1095 return;
1096
1097 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1098 sizeof(flow_ctl));
1099 if (ret)
1100 return;
1101
1102 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1103 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1104
1105 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1106 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1107 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1108 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1109 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE);
1110
1111 if (C_CRTSCTS(tty)) {
1112 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1113 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1114 flow_repl |= CP210X_SERIAL_RTS_SHIFT(CP210X_SERIAL_RTS_FLOW_CTL);
1115 } else {
1116 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1117 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1118 flow_repl |= CP210X_SERIAL_RTS_SHIFT(CP210X_SERIAL_RTS_ACTIVE);
1119 }
1120
1121 dev_dbg(&port->dev, "%s - ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1122 __func__, ctl_hs, flow_repl);
1123
1124 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1125 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1126
1127 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1128 sizeof(flow_ctl));
1129 }
1130
1131 static void cp210x_set_termios(struct tty_struct *tty,
1132 struct usb_serial_port *port, struct ktermios *old_termios)
1133 {
1134 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1135 u16 bits;
1136 int ret;
1137
1138 if (old_termios && !cp210x_termios_change(&tty->termios, old_termios))
1139 return;
1140
1141 if (!old_termios || tty->termios.c_ospeed != old_termios->c_ospeed)
1142 cp210x_change_speed(tty, port, old_termios);
1143
1144 /* CP2101 only supports CS8, 1 stop bit and non-stick parity. */
1145 if (priv->partnum == CP210X_PARTNUM_CP2101) {
1146 tty->termios.c_cflag &= ~(CSIZE | CSTOPB | CMSPAR);
1147 tty->termios.c_cflag |= CS8;
1148 }
1149
1150 bits = 0;
1151
1152 switch (C_CSIZE(tty)) {
1153 case CS5:
1154 bits |= BITS_DATA_5;
1155 break;
1156 case CS6:
1157 bits |= BITS_DATA_6;
1158 break;
1159 case CS7:
1160 bits |= BITS_DATA_7;
1161 break;
1162 case CS8:
1163 default:
1164 bits |= BITS_DATA_8;
1165 break;
1166 }
1167
1168 if (C_PARENB(tty)) {
1169 if (C_CMSPAR(tty)) {
1170 if (C_PARODD(tty))
1171 bits |= BITS_PARITY_MARK;
1172 else
1173 bits |= BITS_PARITY_SPACE;
1174 } else {
1175 if (C_PARODD(tty))
1176 bits |= BITS_PARITY_ODD;
1177 else
1178 bits |= BITS_PARITY_EVEN;
1179 }
1180 }
1181
1182 if (C_CSTOPB(tty))
1183 bits |= BITS_STOP_2;
1184 else
1185 bits |= BITS_STOP_1;
1186
1187 ret = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1188 if (ret)
1189 dev_err(&port->dev, "failed to set line control: %d\n", ret);
1190
1191 cp210x_set_flow_control(tty, port, old_termios);
1192
1193 /*
1194 * Enable event-insertion mode only if input parity checking is
1195 * enabled for now.
1196 */
1197 if (I_INPCK(tty))
1198 cp210x_enable_event_mode(port);
1199 else
1200 cp210x_disable_event_mode(port);
1201 }
1202
1203 static int cp210x_tiocmset(struct tty_struct *tty,
1204 unsigned int set, unsigned int clear)
1205 {
1206 struct usb_serial_port *port = tty->driver_data;
1207 return cp210x_tiocmset_port(port, set, clear);
1208 }
1209
1210 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1211 unsigned int set, unsigned int clear)
1212 {
1213 u16 control = 0;
1214
1215 if (set & TIOCM_RTS) {
1216 control |= CONTROL_RTS;
1217 control |= CONTROL_WRITE_RTS;
1218 }
1219 if (set & TIOCM_DTR) {
1220 control |= CONTROL_DTR;
1221 control |= CONTROL_WRITE_DTR;
1222 }
1223 if (clear & TIOCM_RTS) {
1224 control &= ~CONTROL_RTS;
1225 control |= CONTROL_WRITE_RTS;
1226 }
1227 if (clear & TIOCM_DTR) {
1228 control &= ~CONTROL_DTR;
1229 control |= CONTROL_WRITE_DTR;
1230 }
1231
1232 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
1233
1234 return cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1235 }
1236
1237 static void cp210x_dtr_rts(struct usb_serial_port *port, int on)
1238 {
1239 if (on)
1240 cp210x_tiocmset_port(port, TIOCM_DTR | TIOCM_RTS, 0);
1241 else
1242 cp210x_tiocmset_port(port, 0, TIOCM_DTR | TIOCM_RTS);
1243 }
1244
1245 static int cp210x_tiocmget(struct tty_struct *tty)
1246 {
1247 struct usb_serial_port *port = tty->driver_data;
1248 u8 control;
1249 int result;
1250
1251 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1252 if (result)
1253 return result;
1254
1255 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1256 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1257 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1258 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1259 |((control & CONTROL_RING)? TIOCM_RI : 0)
1260 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
1261
1262 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
1263
1264 return result;
1265 }
1266
1267 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1268 {
1269 struct usb_serial_port *port = tty->driver_data;
1270 u16 state;
1271
1272 if (break_state == 0)
1273 state = BREAK_OFF;
1274 else
1275 state = BREAK_ON;
1276 dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1277 state == BREAK_OFF ? "off" : "on");
1278 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1279 }
1280
1281 #ifdef CONFIG_GPIOLIB
1282 static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset)
1283 {
1284 struct usb_serial *serial = gpiochip_get_data(gc);
1285 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1286
1287 if (priv->gpio_altfunc & BIT(offset))
1288 return -ENODEV;
1289
1290 return 0;
1291 }
1292
1293 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1294 {
1295 struct usb_serial *serial = gpiochip_get_data(gc);
1296 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1297 u8 req_type = REQTYPE_DEVICE_TO_HOST;
1298 int result;
1299 u8 buf;
1300
1301 if (priv->partnum == CP210X_PARTNUM_CP2105)
1302 req_type = REQTYPE_INTERFACE_TO_HOST;
1303
1304 result = usb_autopm_get_interface(serial->interface);
1305 if (result)
1306 return result;
1307
1308 result = cp210x_read_vendor_block(serial, req_type,
1309 CP210X_READ_LATCH, &buf, sizeof(buf));
1310 usb_autopm_put_interface(serial->interface);
1311 if (result < 0)
1312 return result;
1313
1314 return !!(buf & BIT(gpio));
1315 }
1316
1317 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1318 {
1319 struct usb_serial *serial = gpiochip_get_data(gc);
1320 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1321 struct cp210x_gpio_write buf;
1322 int result;
1323
1324 if (value == 1)
1325 buf.state = BIT(gpio);
1326 else
1327 buf.state = 0;
1328
1329 buf.mask = BIT(gpio);
1330
1331 result = usb_autopm_get_interface(serial->interface);
1332 if (result)
1333 goto out;
1334
1335 if (priv->partnum == CP210X_PARTNUM_CP2105) {
1336 result = cp210x_write_vendor_block(serial,
1337 REQTYPE_HOST_TO_INTERFACE,
1338 CP210X_WRITE_LATCH, &buf,
1339 sizeof(buf));
1340 } else {
1341 u16 wIndex = buf.state << 8 | buf.mask;
1342
1343 result = usb_control_msg(serial->dev,
1344 usb_sndctrlpipe(serial->dev, 0),
1345 CP210X_VENDOR_SPECIFIC,
1346 REQTYPE_HOST_TO_DEVICE,
1347 CP210X_WRITE_LATCH,
1348 wIndex,
1349 NULL, 0, USB_CTRL_SET_TIMEOUT);
1350 }
1351
1352 usb_autopm_put_interface(serial->interface);
1353 out:
1354 if (result < 0) {
1355 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n",
1356 result);
1357 }
1358 }
1359
1360 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1361 {
1362 struct usb_serial *serial = gpiochip_get_data(gc);
1363 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1364
1365 return priv->gpio_input & BIT(gpio);
1366 }
1367
1368 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
1369 {
1370 struct usb_serial *serial = gpiochip_get_data(gc);
1371 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1372
1373 if (priv->partnum == CP210X_PARTNUM_CP2105) {
1374 /* hardware does not support an input mode */
1375 return -ENOTSUPP;
1376 }
1377
1378 /* push-pull pins cannot be changed to be inputs */
1379 if (priv->gpio_pushpull & BIT(gpio))
1380 return -EINVAL;
1381
1382 /* make sure to release pin if it is being driven low */
1383 cp210x_gpio_set(gc, gpio, 1);
1384
1385 priv->gpio_input |= BIT(gpio);
1386
1387 return 0;
1388 }
1389
1390 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1391 int value)
1392 {
1393 struct usb_serial *serial = gpiochip_get_data(gc);
1394 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1395
1396 priv->gpio_input &= ~BIT(gpio);
1397 cp210x_gpio_set(gc, gpio, value);
1398
1399 return 0;
1400 }
1401
1402 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
1403 unsigned long config)
1404 {
1405 struct usb_serial *serial = gpiochip_get_data(gc);
1406 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1407 enum pin_config_param param = pinconf_to_config_param(config);
1408
1409 /* Succeed only if in correct mode (this can't be set at runtime) */
1410 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) &&
1411 (priv->gpio_pushpull & BIT(gpio)))
1412 return 0;
1413
1414 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) &&
1415 !(priv->gpio_pushpull & BIT(gpio)))
1416 return 0;
1417
1418 return -ENOTSUPP;
1419 }
1420
1421 /*
1422 * This function is for configuring GPIO using shared pins, where other signals
1423 * are made unavailable by configuring the use of GPIO. This is believed to be
1424 * only applicable to the cp2105 at this point, the other devices supported by
1425 * this driver that provide GPIO do so in a way that does not impact other
1426 * signals and are thus expected to have very different initialisation.
1427 */
1428 static int cp2105_gpioconf_init(struct usb_serial *serial)
1429 {
1430 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1431 struct cp210x_pin_mode mode;
1432 struct cp210x_dual_port_config config;
1433 u8 intf_num = cp210x_interface_num(serial);
1434 u8 iface_config;
1435 int result;
1436
1437 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1438 CP210X_GET_DEVICEMODE, &mode,
1439 sizeof(mode));
1440 if (result < 0)
1441 return result;
1442
1443 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1444 CP210X_GET_PORTCONFIG, &config,
1445 sizeof(config));
1446 if (result < 0)
1447 return result;
1448
1449 /* 2 banks of GPIO - One for the pins taken from each serial port */
1450 if (intf_num == 0) {
1451 if (mode.eci == CP210X_PIN_MODE_MODEM) {
1452 /* mark all GPIOs of this interface as reserved */
1453 priv->gpio_altfunc = 0xff;
1454 return 0;
1455 }
1456
1457 iface_config = config.eci_cfg;
1458 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1459 CP210X_ECI_GPIO_MODE_MASK) >>
1460 CP210X_ECI_GPIO_MODE_OFFSET);
1461 priv->gc.ngpio = 2;
1462 } else if (intf_num == 1) {
1463 if (mode.sci == CP210X_PIN_MODE_MODEM) {
1464 /* mark all GPIOs of this interface as reserved */
1465 priv->gpio_altfunc = 0xff;
1466 return 0;
1467 }
1468
1469 iface_config = config.sci_cfg;
1470 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1471 CP210X_SCI_GPIO_MODE_MASK) >>
1472 CP210X_SCI_GPIO_MODE_OFFSET);
1473 priv->gc.ngpio = 3;
1474 } else {
1475 return -ENODEV;
1476 }
1477
1478 /* mark all pins which are not in GPIO mode */
1479 if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */
1480 priv->gpio_altfunc |= BIT(0);
1481 if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */
1482 CP2105_GPIO1_RS485_MODE))
1483 priv->gpio_altfunc |= BIT(1);
1484
1485 /* driver implementation for CP2105 only supports outputs */
1486 priv->gpio_input = 0;
1487
1488 return 0;
1489 }
1490
1491 static int cp2104_gpioconf_init(struct usb_serial *serial)
1492 {
1493 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1494 struct cp210x_single_port_config config;
1495 u8 iface_config;
1496 u8 gpio_latch;
1497 int result;
1498 u8 i;
1499
1500 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1501 CP210X_GET_PORTCONFIG, &config,
1502 sizeof(config));
1503 if (result < 0)
1504 return result;
1505
1506 priv->gc.ngpio = 4;
1507
1508 iface_config = config.device_cfg;
1509 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1510 CP210X_GPIO_MODE_MASK) >>
1511 CP210X_GPIO_MODE_OFFSET);
1512 gpio_latch = (u8)((le16_to_cpu(config.reset_state) &
1513 CP210X_GPIO_MODE_MASK) >>
1514 CP210X_GPIO_MODE_OFFSET);
1515
1516 /* mark all pins which are not in GPIO mode */
1517 if (iface_config & CP2104_GPIO0_TXLED_MODE) /* GPIO 0 */
1518 priv->gpio_altfunc |= BIT(0);
1519 if (iface_config & CP2104_GPIO1_RXLED_MODE) /* GPIO 1 */
1520 priv->gpio_altfunc |= BIT(1);
1521 if (iface_config & CP2104_GPIO2_RS485_MODE) /* GPIO 2 */
1522 priv->gpio_altfunc |= BIT(2);
1523
1524 /*
1525 * Like CP2102N, CP2104 has also no strict input and output pin
1526 * modes.
1527 * Do the same input mode emulation as CP2102N.
1528 */
1529 for (i = 0; i < priv->gc.ngpio; ++i) {
1530 /*
1531 * Set direction to "input" iff pin is open-drain and reset
1532 * value is 1.
1533 */
1534 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1535 priv->gpio_input |= BIT(i);
1536 }
1537
1538 return 0;
1539 }
1540
1541 static int cp2102n_gpioconf_init(struct usb_serial *serial)
1542 {
1543 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1544 const u16 config_size = 0x02a6;
1545 u8 gpio_rst_latch;
1546 u8 config_version;
1547 u8 gpio_pushpull;
1548 u8 *config_buf;
1549 u8 gpio_latch;
1550 u8 gpio_ctrl;
1551 int result;
1552 u8 i;
1553
1554 /*
1555 * Retrieve device configuration from the device.
1556 * The array received contains all customization settings done at the
1557 * factory/manufacturer. Format of the array is documented at the
1558 * time of writing at:
1559 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa
1560 */
1561 config_buf = kmalloc(config_size, GFP_KERNEL);
1562 if (!config_buf)
1563 return -ENOMEM;
1564
1565 result = cp210x_read_vendor_block(serial,
1566 REQTYPE_DEVICE_TO_HOST,
1567 CP210X_READ_2NCONFIG,
1568 config_buf,
1569 config_size);
1570 if (result < 0) {
1571 kfree(config_buf);
1572 return result;
1573 }
1574
1575 config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX];
1576 gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX];
1577 gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX];
1578 gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX];
1579
1580 kfree(config_buf);
1581
1582 /* Make sure this is a config format we understand. */
1583 if (config_version != 0x01)
1584 return -ENOTSUPP;
1585
1586 priv->gc.ngpio = 4;
1587
1588 /*
1589 * Get default pin states after reset. Needed so we can determine
1590 * the direction of an open-drain pin.
1591 */
1592 gpio_latch = (gpio_rst_latch >> 3) & 0x0f;
1593
1594 /* 0 indicates open-drain mode, 1 is push-pull */
1595 priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f;
1596
1597 /* 0 indicates GPIO mode, 1 is alternate function */
1598 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f;
1599
1600 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) {
1601 /*
1602 * For the QFN28 package, GPIO4-6 are controlled by
1603 * the low three bits of the mode/latch fields.
1604 * Contrary to the document linked above, the bits for
1605 * the SUSPEND pins are elsewhere. No alternate
1606 * function is available for these pins.
1607 */
1608 priv->gc.ngpio = 7;
1609 gpio_latch |= (gpio_rst_latch & 7) << 4;
1610 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4;
1611 }
1612
1613 /*
1614 * The CP2102N does not strictly has input and output pin modes,
1615 * it only knows open-drain and push-pull modes which is set at
1616 * factory. An open-drain pin can function both as an
1617 * input or an output. We emulate input mode for open-drain pins
1618 * by making sure they are not driven low, and we do not allow
1619 * push-pull pins to be set as an input.
1620 */
1621 for (i = 0; i < priv->gc.ngpio; ++i) {
1622 /*
1623 * Set direction to "input" iff pin is open-drain and reset
1624 * value is 1.
1625 */
1626 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1627 priv->gpio_input |= BIT(i);
1628 }
1629
1630 return 0;
1631 }
1632
1633 static int cp210x_gpio_init(struct usb_serial *serial)
1634 {
1635 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1636 int result;
1637
1638 switch (priv->partnum) {
1639 case CP210X_PARTNUM_CP2104:
1640 result = cp2104_gpioconf_init(serial);
1641 break;
1642 case CP210X_PARTNUM_CP2105:
1643 result = cp2105_gpioconf_init(serial);
1644 break;
1645 case CP210X_PARTNUM_CP2102N_QFN28:
1646 case CP210X_PARTNUM_CP2102N_QFN24:
1647 case CP210X_PARTNUM_CP2102N_QFN20:
1648 result = cp2102n_gpioconf_init(serial);
1649 break;
1650 default:
1651 return 0;
1652 }
1653
1654 if (result < 0)
1655 return result;
1656
1657 priv->gc.label = "cp210x";
1658 priv->gc.request = cp210x_gpio_request;
1659 priv->gc.get_direction = cp210x_gpio_direction_get;
1660 priv->gc.direction_input = cp210x_gpio_direction_input;
1661 priv->gc.direction_output = cp210x_gpio_direction_output;
1662 priv->gc.get = cp210x_gpio_get;
1663 priv->gc.set = cp210x_gpio_set;
1664 priv->gc.set_config = cp210x_gpio_set_config;
1665 priv->gc.owner = THIS_MODULE;
1666 priv->gc.parent = &serial->interface->dev;
1667 priv->gc.base = -1;
1668 priv->gc.can_sleep = true;
1669
1670 result = gpiochip_add_data(&priv->gc, serial);
1671 if (!result)
1672 priv->gpio_registered = true;
1673
1674 return result;
1675 }
1676
1677 static void cp210x_gpio_remove(struct usb_serial *serial)
1678 {
1679 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1680
1681 if (priv->gpio_registered) {
1682 gpiochip_remove(&priv->gc);
1683 priv->gpio_registered = false;
1684 }
1685 }
1686
1687 #else
1688
1689 static int cp210x_gpio_init(struct usb_serial *serial)
1690 {
1691 return 0;
1692 }
1693
1694 static void cp210x_gpio_remove(struct usb_serial *serial)
1695 {
1696 /* Nothing to do */
1697 }
1698
1699 #endif
1700
1701 static int cp210x_port_probe(struct usb_serial_port *port)
1702 {
1703 struct usb_serial *serial = port->serial;
1704 struct cp210x_port_private *port_priv;
1705
1706 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1707 if (!port_priv)
1708 return -ENOMEM;
1709
1710 port_priv->bInterfaceNumber = cp210x_interface_num(serial);
1711
1712 usb_set_serial_port_data(port, port_priv);
1713
1714 return 0;
1715 }
1716
1717 static int cp210x_port_remove(struct usb_serial_port *port)
1718 {
1719 struct cp210x_port_private *port_priv;
1720
1721 port_priv = usb_get_serial_port_data(port);
1722 kfree(port_priv);
1723
1724 return 0;
1725 }
1726
1727 static void cp210x_init_max_speed(struct usb_serial *serial)
1728 {
1729 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1730 bool use_actual_rate = false;
1731 speed_t min = 300;
1732 speed_t max;
1733
1734 switch (priv->partnum) {
1735 case CP210X_PARTNUM_CP2101:
1736 max = 921600;
1737 break;
1738 case CP210X_PARTNUM_CP2102:
1739 case CP210X_PARTNUM_CP2103:
1740 max = 1000000;
1741 break;
1742 case CP210X_PARTNUM_CP2104:
1743 use_actual_rate = true;
1744 max = 2000000;
1745 break;
1746 case CP210X_PARTNUM_CP2108:
1747 max = 2000000;
1748 break;
1749 case CP210X_PARTNUM_CP2105:
1750 if (cp210x_interface_num(serial) == 0) {
1751 use_actual_rate = true;
1752 max = 2000000; /* ECI */
1753 } else {
1754 min = 2400;
1755 max = 921600; /* SCI */
1756 }
1757 break;
1758 case CP210X_PARTNUM_CP2102N_QFN28:
1759 case CP210X_PARTNUM_CP2102N_QFN24:
1760 case CP210X_PARTNUM_CP2102N_QFN20:
1761 use_actual_rate = true;
1762 max = 3000000;
1763 break;
1764 default:
1765 max = 2000000;
1766 break;
1767 }
1768
1769 priv->min_speed = min;
1770 priv->max_speed = max;
1771 priv->use_actual_rate = use_actual_rate;
1772 }
1773
1774 static int cp210x_attach(struct usb_serial *serial)
1775 {
1776 int result;
1777 struct cp210x_serial_private *priv;
1778
1779 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1780 if (!priv)
1781 return -ENOMEM;
1782
1783 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1784 CP210X_GET_PARTNUM, &priv->partnum,
1785 sizeof(priv->partnum));
1786 if (result < 0) {
1787 dev_warn(&serial->interface->dev,
1788 "querying part number failed\n");
1789 priv->partnum = CP210X_PARTNUM_UNKNOWN;
1790 }
1791
1792 usb_set_serial_data(serial, priv);
1793
1794 cp210x_init_max_speed(serial);
1795
1796 result = cp210x_gpio_init(serial);
1797 if (result < 0) {
1798 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n",
1799 result);
1800 }
1801
1802 return 0;
1803 }
1804
1805 static void cp210x_disconnect(struct usb_serial *serial)
1806 {
1807 cp210x_gpio_remove(serial);
1808 }
1809
1810 static void cp210x_release(struct usb_serial *serial)
1811 {
1812 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1813
1814 cp210x_gpio_remove(serial);
1815
1816 kfree(priv);
1817 }
1818
1819 module_usb_serial_driver(serial_drivers, id_table);
1820
1821 MODULE_DESCRIPTION(DRIVER_DESC);
1822 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support