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dt-bindings: mtd: ingenic: Use standard ecc-engine property
[linux/fpc-iii.git] / drivers / usb / serial / cp210x.c
blobfffe23ab0189a00b1a7747662c9248cfd41770ae
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, 0x8066) }, /* Argussoft In-System Programmer */
84 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
85 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
86 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
87 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
88 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
89 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
90 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
91 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
92 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
93 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
94 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
95 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
96 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
97 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
98 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
99 { USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */
100 { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */
101 { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */
102 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
103 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
104 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
105 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
106 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
107 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
108 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
109 { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */
110 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
111 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
112 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
113 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
114 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
115 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
116 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
117 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */
118 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
119 { USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */
120 { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */
121 { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */
122 { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */
123 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
124 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
125 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
126 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
127 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
128 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
129 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
130 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
131 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */
132 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
133 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
134 { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */
135 { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */
136 { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */
137 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
138 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
139 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
140 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
141 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
142 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
143 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
144 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
145 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
146 { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */
147 { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */
148 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
149 { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */
150 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
151 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
152 { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */
153 { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */
154 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
155 { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */
156 { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */
157 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
158 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
159 { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */
160 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
161 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
162 { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */
163 { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */
164 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
165 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
166 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
167 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
168 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
169 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
170 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
171 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
172 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
173 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
174 { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */
175 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
176 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
177 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
178 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
179 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
180 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
181 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
182 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
183 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
184 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
185 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
186 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
187 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
188 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
189 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
190 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
191 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
192 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
193 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
194 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
195 { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */
196 { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */
197 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
198 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
199 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
200 { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */
201 { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */
202 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
203 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
204 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
205 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
206 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
207 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
208 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
209 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
210 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
211 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
212 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
213 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
214 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
215 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
216 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
217 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
218 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
219 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
220 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
221 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
222 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
223 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
224 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
225 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
226 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
227 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
228 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
229 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
230 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
231 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
232 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
233 { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */
234 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
235 { } /* Terminating Entry */
236 };
237
238 MODULE_DEVICE_TABLE(usb, id_table);
239
240 struct cp210x_serial_private {
241 #ifdef CONFIG_GPIOLIB
242 struct gpio_chip gc;
243 bool gpio_registered;
244 u8 gpio_pushpull;
245 u8 gpio_altfunc;
246 u8 gpio_input;
247 #endif
248 u8 partnum;
249 speed_t min_speed;
250 speed_t max_speed;
251 bool use_actual_rate;
252 };
253
254 struct cp210x_port_private {
255 __u8 bInterfaceNumber;
256 bool has_swapped_line_ctl;
257 };
258
259 static struct usb_serial_driver cp210x_device = {
260 .driver = {
261 .owner = THIS_MODULE,
262 .name = "cp210x",
263 },
264 .id_table = id_table,
265 .num_ports = 1,
266 .bulk_in_size = 256,
267 .bulk_out_size = 256,
268 .open = cp210x_open,
269 .close = cp210x_close,
270 .break_ctl = cp210x_break_ctl,
271 .set_termios = cp210x_set_termios,
272 .tx_empty = cp210x_tx_empty,
273 .tiocmget = cp210x_tiocmget,
274 .tiocmset = cp210x_tiocmset,
275 .attach = cp210x_attach,
276 .disconnect = cp210x_disconnect,
277 .release = cp210x_release,
278 .port_probe = cp210x_port_probe,
279 .port_remove = cp210x_port_remove,
280 .dtr_rts = cp210x_dtr_rts
281 };
282
283 static struct usb_serial_driver * const serial_drivers[] = {
284 &cp210x_device, NULL
285 };
286
287 /* Config request types */
288 #define REQTYPE_HOST_TO_INTERFACE 0x41
289 #define REQTYPE_INTERFACE_TO_HOST 0xc1
290 #define REQTYPE_HOST_TO_DEVICE 0x40
291 #define REQTYPE_DEVICE_TO_HOST 0xc0
292
293 /* Config request codes */
294 #define CP210X_IFC_ENABLE 0x00
295 #define CP210X_SET_BAUDDIV 0x01
296 #define CP210X_GET_BAUDDIV 0x02
297 #define CP210X_SET_LINE_CTL 0x03
298 #define CP210X_GET_LINE_CTL 0x04
299 #define CP210X_SET_BREAK 0x05
300 #define CP210X_IMM_CHAR 0x06
301 #define CP210X_SET_MHS 0x07
302 #define CP210X_GET_MDMSTS 0x08
303 #define CP210X_SET_XON 0x09
304 #define CP210X_SET_XOFF 0x0A
305 #define CP210X_SET_EVENTMASK 0x0B
306 #define CP210X_GET_EVENTMASK 0x0C
307 #define CP210X_SET_CHAR 0x0D
308 #define CP210X_GET_CHARS 0x0E
309 #define CP210X_GET_PROPS 0x0F
310 #define CP210X_GET_COMM_STATUS 0x10
311 #define CP210X_RESET 0x11
312 #define CP210X_PURGE 0x12
313 #define CP210X_SET_FLOW 0x13
314 #define CP210X_GET_FLOW 0x14
315 #define CP210X_EMBED_EVENTS 0x15
316 #define CP210X_GET_EVENTSTATE 0x16
317 #define CP210X_SET_CHARS 0x19
318 #define CP210X_GET_BAUDRATE 0x1D
319 #define CP210X_SET_BAUDRATE 0x1E
320 #define CP210X_VENDOR_SPECIFIC 0xFF
321
322 /* CP210X_IFC_ENABLE */
323 #define UART_ENABLE 0x0001
324 #define UART_DISABLE 0x0000
325
326 /* CP210X_(SET|GET)_BAUDDIV */
327 #define BAUD_RATE_GEN_FREQ 0x384000
328
329 /* CP210X_(SET|GET)_LINE_CTL */
330 #define BITS_DATA_MASK 0X0f00
331 #define BITS_DATA_5 0X0500
332 #define BITS_DATA_6 0X0600
333 #define BITS_DATA_7 0X0700
334 #define BITS_DATA_8 0X0800
335 #define BITS_DATA_9 0X0900
336
337 #define BITS_PARITY_MASK 0x00f0
338 #define BITS_PARITY_NONE 0x0000
339 #define BITS_PARITY_ODD 0x0010
340 #define BITS_PARITY_EVEN 0x0020
341 #define BITS_PARITY_MARK 0x0030
342 #define BITS_PARITY_SPACE 0x0040
343
344 #define BITS_STOP_MASK 0x000f
345 #define BITS_STOP_1 0x0000
346 #define BITS_STOP_1_5 0x0001
347 #define BITS_STOP_2 0x0002
348
349 /* CP210X_SET_BREAK */
350 #define BREAK_ON 0x0001
351 #define BREAK_OFF 0x0000
352
353 /* CP210X_(SET_MHS|GET_MDMSTS) */
354 #define CONTROL_DTR 0x0001
355 #define CONTROL_RTS 0x0002
356 #define CONTROL_CTS 0x0010
357 #define CONTROL_DSR 0x0020
358 #define CONTROL_RING 0x0040
359 #define CONTROL_DCD 0x0080
360 #define CONTROL_WRITE_DTR 0x0100
361 #define CONTROL_WRITE_RTS 0x0200
362
363 /* CP210X_VENDOR_SPECIFIC values */
364 #define CP210X_READ_2NCONFIG 0x000E
365 #define CP210X_READ_LATCH 0x00C2
366 #define CP210X_GET_PARTNUM 0x370B
367 #define CP210X_GET_PORTCONFIG 0x370C
368 #define CP210X_GET_DEVICEMODE 0x3711
369 #define CP210X_WRITE_LATCH 0x37E1
370
371 /* Part number definitions */
372 #define CP210X_PARTNUM_CP2101 0x01
373 #define CP210X_PARTNUM_CP2102 0x02
374 #define CP210X_PARTNUM_CP2103 0x03
375 #define CP210X_PARTNUM_CP2104 0x04
376 #define CP210X_PARTNUM_CP2105 0x05
377 #define CP210X_PARTNUM_CP2108 0x08
378 #define CP210X_PARTNUM_CP2102N_QFN28 0x20
379 #define CP210X_PARTNUM_CP2102N_QFN24 0x21
380 #define CP210X_PARTNUM_CP2102N_QFN20 0x22
381 #define CP210X_PARTNUM_UNKNOWN 0xFF
382
383 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
384 struct cp210x_comm_status {
385 __le32 ulErrors;
386 __le32 ulHoldReasons;
387 __le32 ulAmountInInQueue;
388 __le32 ulAmountInOutQueue;
389 u8 bEofReceived;
390 u8 bWaitForImmediate;
391 u8 bReserved;
392 } __packed;
393
394 /*
395 * CP210X_PURGE - 16 bits passed in wValue of USB request.
396 * SiLabs app note AN571 gives a strange description of the 4 bits:
397 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
398 * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
399 */
400 #define PURGE_ALL 0x000f
401
402 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
403 struct cp210x_flow_ctl {
404 __le32 ulControlHandshake;
405 __le32 ulFlowReplace;
406 __le32 ulXonLimit;
407 __le32 ulXoffLimit;
408 } __packed;
409
410 /* cp210x_flow_ctl::ulControlHandshake */
411 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0)
412 #define CP210X_SERIAL_DTR_SHIFT(_mode) (_mode)
413 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3)
414 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4)
415 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5)
416 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6)
417
418 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */
419 #define CP210X_SERIAL_DTR_INACTIVE 0
420 #define CP210X_SERIAL_DTR_ACTIVE 1
421 #define CP210X_SERIAL_DTR_FLOW_CTL 2
422
423 /* cp210x_flow_ctl::ulFlowReplace */
424 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0)
425 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1)
426 #define CP210X_SERIAL_ERROR_CHAR BIT(2)
427 #define CP210X_SERIAL_NULL_STRIPPING BIT(3)
428 #define CP210X_SERIAL_BREAK_CHAR BIT(4)
429 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6)
430 #define CP210X_SERIAL_RTS_SHIFT(_mode) (_mode << 6)
431 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31)
432
433 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */
434 #define CP210X_SERIAL_RTS_INACTIVE 0
435 #define CP210X_SERIAL_RTS_ACTIVE 1
436 #define CP210X_SERIAL_RTS_FLOW_CTL 2
437
438 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
439 struct cp210x_pin_mode {
440 u8 eci;
441 u8 sci;
442 } __packed;
443
444 #define CP210X_PIN_MODE_MODEM 0
445 #define CP210X_PIN_MODE_GPIO BIT(0)
446
447 /*
448 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes
449 * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes.
450 */
451 struct cp210x_dual_port_config {
452 __le16 gpio_mode;
453 u8 __pad0[2];
454 __le16 reset_state;
455 u8 __pad1[4];
456 __le16 suspend_state;
457 u8 sci_cfg;
458 u8 eci_cfg;
459 u8 device_cfg;
460 } __packed;
461
462 /*
463 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes
464 * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes.
465 */
466 struct cp210x_single_port_config {
467 __le16 gpio_mode;
468 u8 __pad0[2];
469 __le16 reset_state;
470 u8 __pad1[4];
471 __le16 suspend_state;
472 u8 device_cfg;
473 } __packed;
474
475 /* GPIO modes */
476 #define CP210X_SCI_GPIO_MODE_OFFSET 9
477 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9)
478
479 #define CP210X_ECI_GPIO_MODE_OFFSET 2
480 #define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2)
481
482 #define CP210X_GPIO_MODE_OFFSET 8
483 #define CP210X_GPIO_MODE_MASK GENMASK(11, 8)
484
485 /* CP2105 port configuration values */
486 #define CP2105_GPIO0_TXLED_MODE BIT(0)
487 #define CP2105_GPIO1_RXLED_MODE BIT(1)
488 #define CP2105_GPIO1_RS485_MODE BIT(2)
489
490 /* CP2104 port configuration values */
491 #define CP2104_GPIO0_TXLED_MODE BIT(0)
492 #define CP2104_GPIO1_RXLED_MODE BIT(1)
493 #define CP2104_GPIO2_RS485_MODE BIT(2)
494
495 /* CP2102N configuration array indices */
496 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX 2
497 #define CP210X_2NCONFIG_GPIO_MODE_IDX 581
498 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587
499 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600
500
501 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */
502 struct cp210x_gpio_write {
503 u8 mask;
504 u8 state;
505 } __packed;
506
507 /*
508 * Helper to get interface number when we only have struct usb_serial.
509 */
510 static u8 cp210x_interface_num(struct usb_serial *serial)
511 {
512 struct usb_host_interface *cur_altsetting;
513
514 cur_altsetting = serial->interface->cur_altsetting;
515
516 return cur_altsetting->desc.bInterfaceNumber;
517 }
518
519 /*
520 * Reads a variable-sized block of CP210X_ registers, identified by req.
521 * Returns data into buf in native USB byte order.
522 */
523 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
524 void *buf, int bufsize)
525 {
526 struct usb_serial *serial = port->serial;
527 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
528 void *dmabuf;
529 int result;
530
531 dmabuf = kmalloc(bufsize, GFP_KERNEL);
532 if (!dmabuf) {
533 /*
534 * FIXME Some callers don't bother to check for error,
535 * at least give them consistent junk until they are fixed
536 */
537 memset(buf, 0, bufsize);
538 return -ENOMEM;
539 }
540
541 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
542 req, REQTYPE_INTERFACE_TO_HOST, 0,
543 port_priv->bInterfaceNumber, dmabuf, bufsize,
544 USB_CTRL_SET_TIMEOUT);
545 if (result == bufsize) {
546 memcpy(buf, dmabuf, bufsize);
547 result = 0;
548 } else {
549 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
550 req, bufsize, result);
551 if (result >= 0)
552 result = -EIO;
553
554 /*
555 * FIXME Some callers don't bother to check for error,
556 * at least give them consistent junk until they are fixed
557 */
558 memset(buf, 0, bufsize);
559 }
560
561 kfree(dmabuf);
562
563 return result;
564 }
565
566 /*
567 * Reads any 32-bit CP210X_ register identified by req.
568 */
569 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val)
570 {
571 __le32 le32_val;
572 int err;
573
574 err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val));
575 if (err) {
576 /*
577 * FIXME Some callers don't bother to check for error,
578 * at least give them consistent junk until they are fixed
579 */
580 *val = 0;
581 return err;
582 }
583
584 *val = le32_to_cpu(le32_val);
585
586 return 0;
587 }
588
589 /*
590 * Reads any 16-bit CP210X_ register identified by req.
591 */
592 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val)
593 {
594 __le16 le16_val;
595 int err;
596
597 err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val));
598 if (err)
599 return err;
600
601 *val = le16_to_cpu(le16_val);
602
603 return 0;
604 }
605
606 /*
607 * Reads any 8-bit CP210X_ register identified by req.
608 */
609 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
610 {
611 return cp210x_read_reg_block(port, req, val, sizeof(*val));
612 }
613
614 /*
615 * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
616 * Returns data into buf in native USB byte order.
617 */
618 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
619 void *buf, int bufsize)
620 {
621 void *dmabuf;
622 int result;
623
624 dmabuf = kmalloc(bufsize, GFP_KERNEL);
625 if (!dmabuf)
626 return -ENOMEM;
627
628 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
629 CP210X_VENDOR_SPECIFIC, type, val,
630 cp210x_interface_num(serial), dmabuf, bufsize,
631 USB_CTRL_GET_TIMEOUT);
632 if (result == bufsize) {
633 memcpy(buf, dmabuf, bufsize);
634 result = 0;
635 } else {
636 dev_err(&serial->interface->dev,
637 "failed to get vendor val 0x%04x size %d: %d\n", val,
638 bufsize, result);
639 if (result >= 0)
640 result = -EIO;
641 }
642
643 kfree(dmabuf);
644
645 return result;
646 }
647
648 /*
649 * Writes any 16-bit CP210X_ register (req) whose value is passed
650 * entirely in the wValue field of the USB request.
651 */
652 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
653 {
654 struct usb_serial *serial = port->serial;
655 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
656 int result;
657
658 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
659 req, REQTYPE_HOST_TO_INTERFACE, val,
660 port_priv->bInterfaceNumber, NULL, 0,
661 USB_CTRL_SET_TIMEOUT);
662 if (result < 0) {
663 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
664 req, result);
665 }
666
667 return result;
668 }
669
670 /*
671 * Writes a variable-sized block of CP210X_ registers, identified by req.
672 * Data in buf must be in native USB byte order.
673 */
674 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
675 void *buf, int bufsize)
676 {
677 struct usb_serial *serial = port->serial;
678 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
679 void *dmabuf;
680 int result;
681
682 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
683 if (!dmabuf)
684 return -ENOMEM;
685
686 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
687 req, REQTYPE_HOST_TO_INTERFACE, 0,
688 port_priv->bInterfaceNumber, dmabuf, bufsize,
689 USB_CTRL_SET_TIMEOUT);
690
691 kfree(dmabuf);
692
693 if (result == bufsize) {
694 result = 0;
695 } else {
696 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
697 req, bufsize, result);
698 if (result >= 0)
699 result = -EIO;
700 }
701
702 return result;
703 }
704
705 /*
706 * Writes any 32-bit CP210X_ register identified by req.
707 */
708 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
709 {
710 __le32 le32_val;
711
712 le32_val = cpu_to_le32(val);
713
714 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
715 }
716
717 #ifdef CONFIG_GPIOLIB
718 /*
719 * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
720 * Data in buf must be in native USB byte order.
721 */
722 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
723 u16 val, void *buf, int bufsize)
724 {
725 void *dmabuf;
726 int result;
727
728 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
729 if (!dmabuf)
730 return -ENOMEM;
731
732 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
733 CP210X_VENDOR_SPECIFIC, type, val,
734 cp210x_interface_num(serial), dmabuf, bufsize,
735 USB_CTRL_SET_TIMEOUT);
736
737 kfree(dmabuf);
738
739 if (result == bufsize) {
740 result = 0;
741 } else {
742 dev_err(&serial->interface->dev,
743 "failed to set vendor val 0x%04x size %d: %d\n", val,
744 bufsize, result);
745 if (result >= 0)
746 result = -EIO;
747 }
748
749 return result;
750 }
751 #endif
752
753 /*
754 * Detect CP2108 GET_LINE_CTL bug and activate workaround.
755 * Write a known good value 0x800, read it back.
756 * If it comes back swapped the bug is detected.
757 * Preserve the original register value.
758 */
759 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
760 {
761 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
762 u16 line_ctl_save;
763 u16 line_ctl_test;
764 int err;
765
766 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save);
767 if (err)
768 return err;
769
770 err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800);
771 if (err)
772 return err;
773
774 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test);
775 if (err)
776 return err;
777
778 if (line_ctl_test == 8) {
779 port_priv->has_swapped_line_ctl = true;
780 line_ctl_save = swab16(line_ctl_save);
781 }
782
783 return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save);
784 }
785
786 /*
787 * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL)
788 * to workaround cp2108 bug and get correct value.
789 */
790 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl)
791 {
792 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
793 int err;
794
795 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl);
796 if (err)
797 return err;
798
799 /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
800 if (port_priv->has_swapped_line_ctl)
801 *ctl = swab16(*ctl);
802
803 return 0;
804 }
805
806 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
807 {
808 int result;
809
810 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
811 if (result) {
812 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
813 return result;
814 }
815
816 /* Configure the termios structure */
817 cp210x_get_termios(tty, port);
818
819 /* The baud rate must be initialised on cp2104 */
820 if (tty)
821 cp210x_change_speed(tty, port, NULL);
822
823 return usb_serial_generic_open(tty, port);
824 }
825
826 static void cp210x_close(struct usb_serial_port *port)
827 {
828 usb_serial_generic_close(port);
829
830 /* Clear both queues; cp2108 needs this to avoid an occasional hang */
831 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
832
833 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
834 }
835
836 /*
837 * Read how many bytes are waiting in the TX queue.
838 */
839 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
840 u32 *count)
841 {
842 struct usb_serial *serial = port->serial;
843 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
844 struct cp210x_comm_status *sts;
845 int result;
846
847 sts = kmalloc(sizeof(*sts), GFP_KERNEL);
848 if (!sts)
849 return -ENOMEM;
850
851 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
852 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
853 0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
854 USB_CTRL_GET_TIMEOUT);
855 if (result == sizeof(*sts)) {
856 *count = le32_to_cpu(sts->ulAmountInOutQueue);
857 result = 0;
858 } else {
859 dev_err(&port->dev, "failed to get comm status: %d\n", result);
860 if (result >= 0)
861 result = -EIO;
862 }
863
864 kfree(sts);
865
866 return result;
867 }
868
869 static bool cp210x_tx_empty(struct usb_serial_port *port)
870 {
871 int err;
872 u32 count;
873
874 err = cp210x_get_tx_queue_byte_count(port, &count);
875 if (err)
876 return true;
877
878 return !count;
879 }
880
881 /*
882 * cp210x_get_termios
883 * Reads the baud rate, data bits, parity, stop bits and flow control mode
884 * from the device, corrects any unsupported values, and configures the
885 * termios structure to reflect the state of the device
886 */
887 static void cp210x_get_termios(struct tty_struct *tty,
888 struct usb_serial_port *port)
889 {
890 unsigned int baud;
891
892 if (tty) {
893 cp210x_get_termios_port(tty->driver_data,
894 &tty->termios.c_cflag, &baud);
895 tty_encode_baud_rate(tty, baud, baud);
896 } else {
897 tcflag_t cflag;
898 cflag = 0;
899 cp210x_get_termios_port(port, &cflag, &baud);
900 }
901 }
902
903 /*
904 * cp210x_get_termios_port
905 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
906 */
907 static void cp210x_get_termios_port(struct usb_serial_port *port,
908 tcflag_t *cflagp, unsigned int *baudp)
909 {
910 struct device *dev = &port->dev;
911 tcflag_t cflag;
912 struct cp210x_flow_ctl flow_ctl;
913 u32 baud;
914 u16 bits;
915 u32 ctl_hs;
916
917 cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud);
918
919 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
920 *baudp = baud;
921
922 cflag = *cflagp;
923
924 cp210x_get_line_ctl(port, &bits);
925 cflag &= ~CSIZE;
926 switch (bits & BITS_DATA_MASK) {
927 case BITS_DATA_5:
928 dev_dbg(dev, "%s - data bits = 5\n", __func__);
929 cflag |= CS5;
930 break;
931 case BITS_DATA_6:
932 dev_dbg(dev, "%s - data bits = 6\n", __func__);
933 cflag |= CS6;
934 break;
935 case BITS_DATA_7:
936 dev_dbg(dev, "%s - data bits = 7\n", __func__);
937 cflag |= CS7;
938 break;
939 case BITS_DATA_8:
940 dev_dbg(dev, "%s - data bits = 8\n", __func__);
941 cflag |= CS8;
942 break;
943 case BITS_DATA_9:
944 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
945 cflag |= CS8;
946 bits &= ~BITS_DATA_MASK;
947 bits |= BITS_DATA_8;
948 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
949 break;
950 default:
951 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
952 cflag |= CS8;
953 bits &= ~BITS_DATA_MASK;
954 bits |= BITS_DATA_8;
955 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
956 break;
957 }
958
959 switch (bits & BITS_PARITY_MASK) {
960 case BITS_PARITY_NONE:
961 dev_dbg(dev, "%s - parity = NONE\n", __func__);
962 cflag &= ~PARENB;
963 break;
964 case BITS_PARITY_ODD:
965 dev_dbg(dev, "%s - parity = ODD\n", __func__);
966 cflag |= (PARENB|PARODD);
967 break;
968 case BITS_PARITY_EVEN:
969 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
970 cflag &= ~PARODD;
971 cflag |= PARENB;
972 break;
973 case BITS_PARITY_MARK:
974 dev_dbg(dev, "%s - parity = MARK\n", __func__);
975 cflag |= (PARENB|PARODD|CMSPAR);
976 break;
977 case BITS_PARITY_SPACE:
978 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
979 cflag &= ~PARODD;
980 cflag |= (PARENB|CMSPAR);
981 break;
982 default:
983 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
984 cflag &= ~PARENB;
985 bits &= ~BITS_PARITY_MASK;
986 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
987 break;
988 }
989
990 cflag &= ~CSTOPB;
991 switch (bits & BITS_STOP_MASK) {
992 case BITS_STOP_1:
993 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
994 break;
995 case BITS_STOP_1_5:
996 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
997 bits &= ~BITS_STOP_MASK;
998 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
999 break;
1000 case BITS_STOP_2:
1001 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1002 cflag |= CSTOPB;
1003 break;
1004 default:
1005 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
1006 bits &= ~BITS_STOP_MASK;
1007 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1008 break;
1009 }
1010
1011 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1012 sizeof(flow_ctl));
1013 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1014 if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) {
1015 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1016 cflag |= CRTSCTS;
1017 } else {
1018 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1019 cflag &= ~CRTSCTS;
1020 }
1021
1022 *cflagp = cflag;
1023 }
1024
1025 struct cp210x_rate {
1026 speed_t rate;
1027 speed_t high;
1028 };
1029
1030 static const struct cp210x_rate cp210x_an205_table1[] = {
1031 { 300, 300 },
1032 { 600, 600 },
1033 { 1200, 1200 },
1034 { 1800, 1800 },
1035 { 2400, 2400 },
1036 { 4000, 4000 },
1037 { 4800, 4803 },
1038 { 7200, 7207 },
1039 { 9600, 9612 },
1040 { 14400, 14428 },
1041 { 16000, 16062 },
1042 { 19200, 19250 },
1043 { 28800, 28912 },
1044 { 38400, 38601 },
1045 { 51200, 51558 },
1046 { 56000, 56280 },
1047 { 57600, 58053 },
1048 { 64000, 64111 },
1049 { 76800, 77608 },
1050 { 115200, 117028 },
1051 { 128000, 129347 },
1052 { 153600, 156868 },
1053 { 230400, 237832 },
1054 { 250000, 254234 },
1055 { 256000, 273066 },
1056 { 460800, 491520 },
1057 { 500000, 567138 },
1058 { 576000, 670254 },
1059 { 921600, UINT_MAX }
1060 };
1061
1062 /*
1063 * Quantises the baud rate as per AN205 Table 1
1064 */
1065 static speed_t cp210x_get_an205_rate(speed_t baud)
1066 {
1067 int i;
1068
1069 for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) {
1070 if (baud <= cp210x_an205_table1[i].high)
1071 break;
1072 }
1073
1074 return cp210x_an205_table1[i].rate;
1075 }
1076
1077 static speed_t cp210x_get_actual_rate(speed_t baud)
1078 {
1079 unsigned int prescale = 1;
1080 unsigned int div;
1081
1082 if (baud <= 365)
1083 prescale = 4;
1084
1085 div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud);
1086 baud = 48000000 / (2 * prescale * div);
1087
1088 return baud;
1089 }
1090
1091 /*
1092 * CP2101 supports the following baud rates:
1093 *
1094 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
1095 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
1096 *
1097 * CP2102 and CP2103 support the following additional rates:
1098 *
1099 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
1100 * 576000
1101 *
1102 * The device will map a requested rate to a supported one, but the result
1103 * of requests for rates greater than 1053257 is undefined (see AN205).
1104 *
1105 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
1106 * respectively, with an error less than 1%. The actual rates are determined
1107 * by
1108 *
1109 * div = round(freq / (2 x prescale x request))
1110 * actual = freq / (2 x prescale x div)
1111 *
1112 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1113 * or 1 otherwise.
1114 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1115 * otherwise.
1116 */
1117 static void cp210x_change_speed(struct tty_struct *tty,
1118 struct usb_serial_port *port, struct ktermios *old_termios)
1119 {
1120 struct usb_serial *serial = port->serial;
1121 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1122 u32 baud;
1123
1124 /*
1125 * This maps the requested rate to the actual rate, a valid rate on
1126 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed].
1127 *
1128 * NOTE: B0 is not implemented.
1129 */
1130 baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed);
1131
1132 if (priv->use_actual_rate)
1133 baud = cp210x_get_actual_rate(baud);
1134 else if (baud < 1000000)
1135 baud = cp210x_get_an205_rate(baud);
1136
1137 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1138 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1139 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1140 if (old_termios)
1141 baud = old_termios->c_ospeed;
1142 else
1143 baud = 9600;
1144 }
1145
1146 tty_encode_baud_rate(tty, baud, baud);
1147 }
1148
1149 static void cp210x_set_termios(struct tty_struct *tty,
1150 struct usb_serial_port *port, struct ktermios *old_termios)
1151 {
1152 struct device *dev = &port->dev;
1153 unsigned int cflag, old_cflag;
1154 u16 bits;
1155
1156 cflag = tty->termios.c_cflag;
1157 old_cflag = old_termios->c_cflag;
1158
1159 if (tty->termios.c_ospeed != old_termios->c_ospeed)
1160 cp210x_change_speed(tty, port, old_termios);
1161
1162 /* If the number of data bits is to be updated */
1163 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
1164 cp210x_get_line_ctl(port, &bits);
1165 bits &= ~BITS_DATA_MASK;
1166 switch (cflag & CSIZE) {
1167 case CS5:
1168 bits |= BITS_DATA_5;
1169 dev_dbg(dev, "%s - data bits = 5\n", __func__);
1170 break;
1171 case CS6:
1172 bits |= BITS_DATA_6;
1173 dev_dbg(dev, "%s - data bits = 6\n", __func__);
1174 break;
1175 case CS7:
1176 bits |= BITS_DATA_7;
1177 dev_dbg(dev, "%s - data bits = 7\n", __func__);
1178 break;
1179 case CS8:
1180 default:
1181 bits |= BITS_DATA_8;
1182 dev_dbg(dev, "%s - data bits = 8\n", __func__);
1183 break;
1184 }
1185 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1186 dev_dbg(dev, "Number of data bits requested not supported by device\n");
1187 }
1188
1189 if ((cflag & (PARENB|PARODD|CMSPAR)) !=
1190 (old_cflag & (PARENB|PARODD|CMSPAR))) {
1191 cp210x_get_line_ctl(port, &bits);
1192 bits &= ~BITS_PARITY_MASK;
1193 if (cflag & PARENB) {
1194 if (cflag & CMSPAR) {
1195 if (cflag & PARODD) {
1196 bits |= BITS_PARITY_MARK;
1197 dev_dbg(dev, "%s - parity = MARK\n", __func__);
1198 } else {
1199 bits |= BITS_PARITY_SPACE;
1200 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
1201 }
1202 } else {
1203 if (cflag & PARODD) {
1204 bits |= BITS_PARITY_ODD;
1205 dev_dbg(dev, "%s - parity = ODD\n", __func__);
1206 } else {
1207 bits |= BITS_PARITY_EVEN;
1208 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
1209 }
1210 }
1211 }
1212 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1213 dev_dbg(dev, "Parity mode not supported by device\n");
1214 }
1215
1216 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
1217 cp210x_get_line_ctl(port, &bits);
1218 bits &= ~BITS_STOP_MASK;
1219 if (cflag & CSTOPB) {
1220 bits |= BITS_STOP_2;
1221 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1222 } else {
1223 bits |= BITS_STOP_1;
1224 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
1225 }
1226 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1227 dev_dbg(dev, "Number of stop bits requested not supported by device\n");
1228 }
1229
1230 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
1231 struct cp210x_flow_ctl flow_ctl;
1232 u32 ctl_hs;
1233 u32 flow_repl;
1234
1235 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1236 sizeof(flow_ctl));
1237 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1238 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1239 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1240 __func__, ctl_hs, flow_repl);
1241
1242 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1243 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1244 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1245 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1246 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE);
1247 if (cflag & CRTSCTS) {
1248 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1249
1250 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1251 flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1252 CP210X_SERIAL_RTS_FLOW_CTL);
1253 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1254 } else {
1255 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1256
1257 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1258 flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1259 CP210X_SERIAL_RTS_ACTIVE);
1260 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1261 }
1262
1263 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1264 __func__, ctl_hs, flow_repl);
1265 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1266 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1267 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1268 sizeof(flow_ctl));
1269 }
1270
1271 }
1272
1273 static int cp210x_tiocmset(struct tty_struct *tty,
1274 unsigned int set, unsigned int clear)
1275 {
1276 struct usb_serial_port *port = tty->driver_data;
1277 return cp210x_tiocmset_port(port, set, clear);
1278 }
1279
1280 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1281 unsigned int set, unsigned int clear)
1282 {
1283 u16 control = 0;
1284
1285 if (set & TIOCM_RTS) {
1286 control |= CONTROL_RTS;
1287 control |= CONTROL_WRITE_RTS;
1288 }
1289 if (set & TIOCM_DTR) {
1290 control |= CONTROL_DTR;
1291 control |= CONTROL_WRITE_DTR;
1292 }
1293 if (clear & TIOCM_RTS) {
1294 control &= ~CONTROL_RTS;
1295 control |= CONTROL_WRITE_RTS;
1296 }
1297 if (clear & TIOCM_DTR) {
1298 control &= ~CONTROL_DTR;
1299 control |= CONTROL_WRITE_DTR;
1300 }
1301
1302 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
1303
1304 return cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1305 }
1306
1307 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
1308 {
1309 if (on)
1310 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
1311 else
1312 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
1313 }
1314
1315 static int cp210x_tiocmget(struct tty_struct *tty)
1316 {
1317 struct usb_serial_port *port = tty->driver_data;
1318 u8 control;
1319 int result;
1320
1321 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1322 if (result)
1323 return result;
1324
1325 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1326 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1327 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1328 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1329 |((control & CONTROL_RING)? TIOCM_RI : 0)
1330 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
1331
1332 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
1333
1334 return result;
1335 }
1336
1337 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1338 {
1339 struct usb_serial_port *port = tty->driver_data;
1340 u16 state;
1341
1342 if (break_state == 0)
1343 state = BREAK_OFF;
1344 else
1345 state = BREAK_ON;
1346 dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1347 state == BREAK_OFF ? "off" : "on");
1348 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1349 }
1350
1351 #ifdef CONFIG_GPIOLIB
1352 static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset)
1353 {
1354 struct usb_serial *serial = gpiochip_get_data(gc);
1355 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1356
1357 if (priv->gpio_altfunc & BIT(offset))
1358 return -ENODEV;
1359
1360 return 0;
1361 }
1362
1363 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1364 {
1365 struct usb_serial *serial = gpiochip_get_data(gc);
1366 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1367 u8 req_type = REQTYPE_DEVICE_TO_HOST;
1368 int result;
1369 u8 buf;
1370
1371 if (priv->partnum == CP210X_PARTNUM_CP2105)
1372 req_type = REQTYPE_INTERFACE_TO_HOST;
1373
1374 result = usb_autopm_get_interface(serial->interface);
1375 if (result)
1376 return result;
1377
1378 result = cp210x_read_vendor_block(serial, req_type,
1379 CP210X_READ_LATCH, &buf, sizeof(buf));
1380 usb_autopm_put_interface(serial->interface);
1381 if (result < 0)
1382 return result;
1383
1384 return !!(buf & BIT(gpio));
1385 }
1386
1387 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1388 {
1389 struct usb_serial *serial = gpiochip_get_data(gc);
1390 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1391 struct cp210x_gpio_write buf;
1392 int result;
1393
1394 if (value == 1)
1395 buf.state = BIT(gpio);
1396 else
1397 buf.state = 0;
1398
1399 buf.mask = BIT(gpio);
1400
1401 result = usb_autopm_get_interface(serial->interface);
1402 if (result)
1403 goto out;
1404
1405 if (priv->partnum == CP210X_PARTNUM_CP2105) {
1406 result = cp210x_write_vendor_block(serial,
1407 REQTYPE_HOST_TO_INTERFACE,
1408 CP210X_WRITE_LATCH, &buf,
1409 sizeof(buf));
1410 } else {
1411 u16 wIndex = buf.state << 8 | buf.mask;
1412
1413 result = usb_control_msg(serial->dev,
1414 usb_sndctrlpipe(serial->dev, 0),
1415 CP210X_VENDOR_SPECIFIC,
1416 REQTYPE_HOST_TO_DEVICE,
1417 CP210X_WRITE_LATCH,
1418 wIndex,
1419 NULL, 0, USB_CTRL_SET_TIMEOUT);
1420 }
1421
1422 usb_autopm_put_interface(serial->interface);
1423 out:
1424 if (result < 0) {
1425 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n",
1426 result);
1427 }
1428 }
1429
1430 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1431 {
1432 struct usb_serial *serial = gpiochip_get_data(gc);
1433 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1434
1435 return priv->gpio_input & BIT(gpio);
1436 }
1437
1438 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
1439 {
1440 struct usb_serial *serial = gpiochip_get_data(gc);
1441 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1442
1443 if (priv->partnum == CP210X_PARTNUM_CP2105) {
1444 /* hardware does not support an input mode */
1445 return -ENOTSUPP;
1446 }
1447
1448 /* push-pull pins cannot be changed to be inputs */
1449 if (priv->gpio_pushpull & BIT(gpio))
1450 return -EINVAL;
1451
1452 /* make sure to release pin if it is being driven low */
1453 cp210x_gpio_set(gc, gpio, 1);
1454
1455 priv->gpio_input |= BIT(gpio);
1456
1457 return 0;
1458 }
1459
1460 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1461 int value)
1462 {
1463 struct usb_serial *serial = gpiochip_get_data(gc);
1464 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1465
1466 priv->gpio_input &= ~BIT(gpio);
1467 cp210x_gpio_set(gc, gpio, value);
1468
1469 return 0;
1470 }
1471
1472 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
1473 unsigned long config)
1474 {
1475 struct usb_serial *serial = gpiochip_get_data(gc);
1476 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1477 enum pin_config_param param = pinconf_to_config_param(config);
1478
1479 /* Succeed only if in correct mode (this can't be set at runtime) */
1480 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) &&
1481 (priv->gpio_pushpull & BIT(gpio)))
1482 return 0;
1483
1484 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) &&
1485 !(priv->gpio_pushpull & BIT(gpio)))
1486 return 0;
1487
1488 return -ENOTSUPP;
1489 }
1490
1491 /*
1492 * This function is for configuring GPIO using shared pins, where other signals
1493 * are made unavailable by configuring the use of GPIO. This is believed to be
1494 * only applicable to the cp2105 at this point, the other devices supported by
1495 * this driver that provide GPIO do so in a way that does not impact other
1496 * signals and are thus expected to have very different initialisation.
1497 */
1498 static int cp2105_gpioconf_init(struct usb_serial *serial)
1499 {
1500 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1501 struct cp210x_pin_mode mode;
1502 struct cp210x_dual_port_config config;
1503 u8 intf_num = cp210x_interface_num(serial);
1504 u8 iface_config;
1505 int result;
1506
1507 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1508 CP210X_GET_DEVICEMODE, &mode,
1509 sizeof(mode));
1510 if (result < 0)
1511 return result;
1512
1513 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1514 CP210X_GET_PORTCONFIG, &config,
1515 sizeof(config));
1516 if (result < 0)
1517 return result;
1518
1519 /* 2 banks of GPIO - One for the pins taken from each serial port */
1520 if (intf_num == 0) {
1521 if (mode.eci == CP210X_PIN_MODE_MODEM) {
1522 /* mark all GPIOs of this interface as reserved */
1523 priv->gpio_altfunc = 0xff;
1524 return 0;
1525 }
1526
1527 iface_config = config.eci_cfg;
1528 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1529 CP210X_ECI_GPIO_MODE_MASK) >>
1530 CP210X_ECI_GPIO_MODE_OFFSET);
1531 priv->gc.ngpio = 2;
1532 } else if (intf_num == 1) {
1533 if (mode.sci == CP210X_PIN_MODE_MODEM) {
1534 /* mark all GPIOs of this interface as reserved */
1535 priv->gpio_altfunc = 0xff;
1536 return 0;
1537 }
1538
1539 iface_config = config.sci_cfg;
1540 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1541 CP210X_SCI_GPIO_MODE_MASK) >>
1542 CP210X_SCI_GPIO_MODE_OFFSET);
1543 priv->gc.ngpio = 3;
1544 } else {
1545 return -ENODEV;
1546 }
1547
1548 /* mark all pins which are not in GPIO mode */
1549 if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */
1550 priv->gpio_altfunc |= BIT(0);
1551 if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */
1552 CP2105_GPIO1_RS485_MODE))
1553 priv->gpio_altfunc |= BIT(1);
1554
1555 /* driver implementation for CP2105 only supports outputs */
1556 priv->gpio_input = 0;
1557
1558 return 0;
1559 }
1560
1561 static int cp2104_gpioconf_init(struct usb_serial *serial)
1562 {
1563 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1564 struct cp210x_single_port_config config;
1565 u8 iface_config;
1566 u8 gpio_latch;
1567 int result;
1568 u8 i;
1569
1570 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1571 CP210X_GET_PORTCONFIG, &config,
1572 sizeof(config));
1573 if (result < 0)
1574 return result;
1575
1576 priv->gc.ngpio = 4;
1577
1578 iface_config = config.device_cfg;
1579 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1580 CP210X_GPIO_MODE_MASK) >>
1581 CP210X_GPIO_MODE_OFFSET);
1582 gpio_latch = (u8)((le16_to_cpu(config.reset_state) &
1583 CP210X_GPIO_MODE_MASK) >>
1584 CP210X_GPIO_MODE_OFFSET);
1585
1586 /* mark all pins which are not in GPIO mode */
1587 if (iface_config & CP2104_GPIO0_TXLED_MODE) /* GPIO 0 */
1588 priv->gpio_altfunc |= BIT(0);
1589 if (iface_config & CP2104_GPIO1_RXLED_MODE) /* GPIO 1 */
1590 priv->gpio_altfunc |= BIT(1);
1591 if (iface_config & CP2104_GPIO2_RS485_MODE) /* GPIO 2 */
1592 priv->gpio_altfunc |= BIT(2);
1593
1594 /*
1595 * Like CP2102N, CP2104 has also no strict input and output pin
1596 * modes.
1597 * Do the same input mode emulation as CP2102N.
1598 */
1599 for (i = 0; i < priv->gc.ngpio; ++i) {
1600 /*
1601 * Set direction to "input" iff pin is open-drain and reset
1602 * value is 1.
1603 */
1604 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1605 priv->gpio_input |= BIT(i);
1606 }
1607
1608 return 0;
1609 }
1610
1611 static int cp2102n_gpioconf_init(struct usb_serial *serial)
1612 {
1613 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1614 const u16 config_size = 0x02a6;
1615 u8 gpio_rst_latch;
1616 u8 config_version;
1617 u8 gpio_pushpull;
1618 u8 *config_buf;
1619 u8 gpio_latch;
1620 u8 gpio_ctrl;
1621 int result;
1622 u8 i;
1623
1624 /*
1625 * Retrieve device configuration from the device.
1626 * The array received contains all customization settings done at the
1627 * factory/manufacturer. Format of the array is documented at the
1628 * time of writing at:
1629 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa
1630 */
1631 config_buf = kmalloc(config_size, GFP_KERNEL);
1632 if (!config_buf)
1633 return -ENOMEM;
1634
1635 result = cp210x_read_vendor_block(serial,
1636 REQTYPE_DEVICE_TO_HOST,
1637 CP210X_READ_2NCONFIG,
1638 config_buf,
1639 config_size);
1640 if (result < 0) {
1641 kfree(config_buf);
1642 return result;
1643 }
1644
1645 config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX];
1646 gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX];
1647 gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX];
1648 gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX];
1649
1650 kfree(config_buf);
1651
1652 /* Make sure this is a config format we understand. */
1653 if (config_version != 0x01)
1654 return -ENOTSUPP;
1655
1656 priv->gc.ngpio = 4;
1657
1658 /*
1659 * Get default pin states after reset. Needed so we can determine
1660 * the direction of an open-drain pin.
1661 */
1662 gpio_latch = (gpio_rst_latch >> 3) & 0x0f;
1663
1664 /* 0 indicates open-drain mode, 1 is push-pull */
1665 priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f;
1666
1667 /* 0 indicates GPIO mode, 1 is alternate function */
1668 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f;
1669
1670 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) {
1671 /*
1672 * For the QFN28 package, GPIO4-6 are controlled by
1673 * the low three bits of the mode/latch fields.
1674 * Contrary to the document linked above, the bits for
1675 * the SUSPEND pins are elsewhere. No alternate
1676 * function is available for these pins.
1677 */
1678 priv->gc.ngpio = 7;
1679 gpio_latch |= (gpio_rst_latch & 7) << 4;
1680 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4;
1681 }
1682
1683 /*
1684 * The CP2102N does not strictly has input and output pin modes,
1685 * it only knows open-drain and push-pull modes which is set at
1686 * factory. An open-drain pin can function both as an
1687 * input or an output. We emulate input mode for open-drain pins
1688 * by making sure they are not driven low, and we do not allow
1689 * push-pull pins to be set as an input.
1690 */
1691 for (i = 0; i < priv->gc.ngpio; ++i) {
1692 /*
1693 * Set direction to "input" iff pin is open-drain and reset
1694 * value is 1.
1695 */
1696 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1697 priv->gpio_input |= BIT(i);
1698 }
1699
1700 return 0;
1701 }
1702
1703 static int cp210x_gpio_init(struct usb_serial *serial)
1704 {
1705 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1706 int result;
1707
1708 switch (priv->partnum) {
1709 case CP210X_PARTNUM_CP2104:
1710 result = cp2104_gpioconf_init(serial);
1711 break;
1712 case CP210X_PARTNUM_CP2105:
1713 result = cp2105_gpioconf_init(serial);
1714 break;
1715 case CP210X_PARTNUM_CP2102N_QFN28:
1716 case CP210X_PARTNUM_CP2102N_QFN24:
1717 case CP210X_PARTNUM_CP2102N_QFN20:
1718 result = cp2102n_gpioconf_init(serial);
1719 break;
1720 default:
1721 return 0;
1722 }
1723
1724 if (result < 0)
1725 return result;
1726
1727 priv->gc.label = "cp210x";
1728 priv->gc.request = cp210x_gpio_request;
1729 priv->gc.get_direction = cp210x_gpio_direction_get;
1730 priv->gc.direction_input = cp210x_gpio_direction_input;
1731 priv->gc.direction_output = cp210x_gpio_direction_output;
1732 priv->gc.get = cp210x_gpio_get;
1733 priv->gc.set = cp210x_gpio_set;
1734 priv->gc.set_config = cp210x_gpio_set_config;
1735 priv->gc.owner = THIS_MODULE;
1736 priv->gc.parent = &serial->interface->dev;
1737 priv->gc.base = -1;
1738 priv->gc.can_sleep = true;
1739
1740 result = gpiochip_add_data(&priv->gc, serial);
1741 if (!result)
1742 priv->gpio_registered = true;
1743
1744 return result;
1745 }
1746
1747 static void cp210x_gpio_remove(struct usb_serial *serial)
1748 {
1749 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1750
1751 if (priv->gpio_registered) {
1752 gpiochip_remove(&priv->gc);
1753 priv->gpio_registered = false;
1754 }
1755 }
1756
1757 #else
1758
1759 static int cp210x_gpio_init(struct usb_serial *serial)
1760 {
1761 return 0;
1762 }
1763
1764 static void cp210x_gpio_remove(struct usb_serial *serial)
1765 {
1766 /* Nothing to do */
1767 }
1768
1769 #endif
1770
1771 static int cp210x_port_probe(struct usb_serial_port *port)
1772 {
1773 struct usb_serial *serial = port->serial;
1774 struct cp210x_port_private *port_priv;
1775 int ret;
1776
1777 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1778 if (!port_priv)
1779 return -ENOMEM;
1780
1781 port_priv->bInterfaceNumber = cp210x_interface_num(serial);
1782
1783 usb_set_serial_port_data(port, port_priv);
1784
1785 ret = cp210x_detect_swapped_line_ctl(port);
1786 if (ret) {
1787 kfree(port_priv);
1788 return ret;
1789 }
1790
1791 return 0;
1792 }
1793
1794 static int cp210x_port_remove(struct usb_serial_port *port)
1795 {
1796 struct cp210x_port_private *port_priv;
1797
1798 port_priv = usb_get_serial_port_data(port);
1799 kfree(port_priv);
1800
1801 return 0;
1802 }
1803
1804 static void cp210x_init_max_speed(struct usb_serial *serial)
1805 {
1806 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1807 bool use_actual_rate = false;
1808 speed_t min = 300;
1809 speed_t max;
1810
1811 switch (priv->partnum) {
1812 case CP210X_PARTNUM_CP2101:
1813 max = 921600;
1814 break;
1815 case CP210X_PARTNUM_CP2102:
1816 case CP210X_PARTNUM_CP2103:
1817 max = 1000000;
1818 break;
1819 case CP210X_PARTNUM_CP2104:
1820 use_actual_rate = true;
1821 max = 2000000;
1822 break;
1823 case CP210X_PARTNUM_CP2108:
1824 max = 2000000;
1825 break;
1826 case CP210X_PARTNUM_CP2105:
1827 if (cp210x_interface_num(serial) == 0) {
1828 use_actual_rate = true;
1829 max = 2000000; /* ECI */
1830 } else {
1831 min = 2400;
1832 max = 921600; /* SCI */
1833 }
1834 break;
1835 case CP210X_PARTNUM_CP2102N_QFN28:
1836 case CP210X_PARTNUM_CP2102N_QFN24:
1837 case CP210X_PARTNUM_CP2102N_QFN20:
1838 use_actual_rate = true;
1839 max = 3000000;
1840 break;
1841 default:
1842 max = 2000000;
1843 break;
1844 }
1845
1846 priv->min_speed = min;
1847 priv->max_speed = max;
1848 priv->use_actual_rate = use_actual_rate;
1849 }
1850
1851 static int cp210x_attach(struct usb_serial *serial)
1852 {
1853 int result;
1854 struct cp210x_serial_private *priv;
1855
1856 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1857 if (!priv)
1858 return -ENOMEM;
1859
1860 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1861 CP210X_GET_PARTNUM, &priv->partnum,
1862 sizeof(priv->partnum));
1863 if (result < 0) {
1864 dev_warn(&serial->interface->dev,
1865 "querying part number failed\n");
1866 priv->partnum = CP210X_PARTNUM_UNKNOWN;
1867 }
1868
1869 usb_set_serial_data(serial, priv);
1870
1871 cp210x_init_max_speed(serial);
1872
1873 result = cp210x_gpio_init(serial);
1874 if (result < 0) {
1875 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n",
1876 result);
1877 }
1878
1879 return 0;
1880 }
1881
1882 static void cp210x_disconnect(struct usb_serial *serial)
1883 {
1884 cp210x_gpio_remove(serial);
1885 }
1886
1887 static void cp210x_release(struct usb_serial *serial)
1888 {
1889 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1890
1891 cp210x_gpio_remove(serial);
1892
1893 kfree(priv);
1894 }
1895
1896 module_usb_serial_driver(serial_drivers, id_table);
1897
1898 MODULE_DESCRIPTION(DRIVER_DESC);
1899 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support