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Merge tag 'usb-4.19-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
[linux-2.6/btrfs-unstable.git] / drivers / usb / serial / cp210x.c
blobc0777a374a88f86847b8ada0891d9849e7aa70a8
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(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
65 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
66 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
67 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
68 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
69 { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */
70 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
71 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
72 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
73 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
74 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
75 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
76 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
77 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
78 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
79 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
80 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
81 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
82 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
83 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
84 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
85 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
86 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
87 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
88 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
89 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
90 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
91 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
92 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
93 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
94 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
95 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
96 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
97 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
98 { USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */
99 { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */
100 { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */
101 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
102 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
103 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
104 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
105 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
106 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
107 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
108 { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */
109 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
110 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
111 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
112 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
113 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
114 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
115 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
116 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */
117 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
118 { USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */
119 { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */
120 { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */
121 { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */
122 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
123 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
124 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
125 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
126 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
127 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
128 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
129 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
130 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */
131 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
132 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
133 { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */
134 { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */
135 { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */
136 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
137 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
138 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
139 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
140 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
141 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
142 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
143 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
144 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
145 { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */
146 { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */
147 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
148 { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */
149 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
150 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
151 { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */
152 { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */
153 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
154 { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */
155 { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */
156 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
157 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
158 { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */
159 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
160 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
161 { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */
162 { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */
163 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
164 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
165 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
166 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
167 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
168 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
169 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
170 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
171 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
172 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
173 { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */
174 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
175 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
176 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
177 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
178 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
179 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
180 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
181 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
182 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
183 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
184 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
185 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
186 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
187 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
188 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
189 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
190 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
191 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
192 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
193 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
194 { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */
195 { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */
196 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
197 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
198 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
199 { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */
200 { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */
201 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
202 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
203 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
204 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
205 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
206 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
207 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
208 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
209 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
210 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
211 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
212 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
213 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
214 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
215 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
216 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
217 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
218 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
219 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
220 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
221 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
222 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
223 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
224 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
225 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
226 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
227 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
228 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
229 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
230 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
231 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
232 { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */
233 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
234 { } /* Terminating Entry */
235 };
236
237 MODULE_DEVICE_TABLE(usb, id_table);
238
239 struct cp210x_serial_private {
240 #ifdef CONFIG_GPIOLIB
241 struct gpio_chip gc;
242 bool gpio_registered;
243 u8 gpio_pushpull;
244 u8 gpio_altfunc;
245 u8 gpio_input;
246 #endif
247 u8 partnum;
248 speed_t max_speed;
249 bool use_actual_rate;
250 };
251
252 struct cp210x_port_private {
253 __u8 bInterfaceNumber;
254 bool has_swapped_line_ctl;
255 };
256
257 static struct usb_serial_driver cp210x_device = {
258 .driver = {
259 .owner = THIS_MODULE,
260 .name = "cp210x",
261 },
262 .id_table = id_table,
263 .num_ports = 1,
264 .bulk_in_size = 256,
265 .bulk_out_size = 256,
266 .open = cp210x_open,
267 .close = cp210x_close,
268 .break_ctl = cp210x_break_ctl,
269 .set_termios = cp210x_set_termios,
270 .tx_empty = cp210x_tx_empty,
271 .tiocmget = cp210x_tiocmget,
272 .tiocmset = cp210x_tiocmset,
273 .attach = cp210x_attach,
274 .disconnect = cp210x_disconnect,
275 .release = cp210x_release,
276 .port_probe = cp210x_port_probe,
277 .port_remove = cp210x_port_remove,
278 .dtr_rts = cp210x_dtr_rts
279 };
280
281 static struct usb_serial_driver * const serial_drivers[] = {
282 &cp210x_device, NULL
283 };
284
285 /* Config request types */
286 #define REQTYPE_HOST_TO_INTERFACE 0x41
287 #define REQTYPE_INTERFACE_TO_HOST 0xc1
288 #define REQTYPE_HOST_TO_DEVICE 0x40
289 #define REQTYPE_DEVICE_TO_HOST 0xc0
290
291 /* Config request codes */
292 #define CP210X_IFC_ENABLE 0x00
293 #define CP210X_SET_BAUDDIV 0x01
294 #define CP210X_GET_BAUDDIV 0x02
295 #define CP210X_SET_LINE_CTL 0x03
296 #define CP210X_GET_LINE_CTL 0x04
297 #define CP210X_SET_BREAK 0x05
298 #define CP210X_IMM_CHAR 0x06
299 #define CP210X_SET_MHS 0x07
300 #define CP210X_GET_MDMSTS 0x08
301 #define CP210X_SET_XON 0x09
302 #define CP210X_SET_XOFF 0x0A
303 #define CP210X_SET_EVENTMASK 0x0B
304 #define CP210X_GET_EVENTMASK 0x0C
305 #define CP210X_SET_CHAR 0x0D
306 #define CP210X_GET_CHARS 0x0E
307 #define CP210X_GET_PROPS 0x0F
308 #define CP210X_GET_COMM_STATUS 0x10
309 #define CP210X_RESET 0x11
310 #define CP210X_PURGE 0x12
311 #define CP210X_SET_FLOW 0x13
312 #define CP210X_GET_FLOW 0x14
313 #define CP210X_EMBED_EVENTS 0x15
314 #define CP210X_GET_EVENTSTATE 0x16
315 #define CP210X_SET_CHARS 0x19
316 #define CP210X_GET_BAUDRATE 0x1D
317 #define CP210X_SET_BAUDRATE 0x1E
318 #define CP210X_VENDOR_SPECIFIC 0xFF
319
320 /* CP210X_IFC_ENABLE */
321 #define UART_ENABLE 0x0001
322 #define UART_DISABLE 0x0000
323
324 /* CP210X_(SET|GET)_BAUDDIV */
325 #define BAUD_RATE_GEN_FREQ 0x384000
326
327 /* CP210X_(SET|GET)_LINE_CTL */
328 #define BITS_DATA_MASK 0X0f00
329 #define BITS_DATA_5 0X0500
330 #define BITS_DATA_6 0X0600
331 #define BITS_DATA_7 0X0700
332 #define BITS_DATA_8 0X0800
333 #define BITS_DATA_9 0X0900
334
335 #define BITS_PARITY_MASK 0x00f0
336 #define BITS_PARITY_NONE 0x0000
337 #define BITS_PARITY_ODD 0x0010
338 #define BITS_PARITY_EVEN 0x0020
339 #define BITS_PARITY_MARK 0x0030
340 #define BITS_PARITY_SPACE 0x0040
341
342 #define BITS_STOP_MASK 0x000f
343 #define BITS_STOP_1 0x0000
344 #define BITS_STOP_1_5 0x0001
345 #define BITS_STOP_2 0x0002
346
347 /* CP210X_SET_BREAK */
348 #define BREAK_ON 0x0001
349 #define BREAK_OFF 0x0000
350
351 /* CP210X_(SET_MHS|GET_MDMSTS) */
352 #define CONTROL_DTR 0x0001
353 #define CONTROL_RTS 0x0002
354 #define CONTROL_CTS 0x0010
355 #define CONTROL_DSR 0x0020
356 #define CONTROL_RING 0x0040
357 #define CONTROL_DCD 0x0080
358 #define CONTROL_WRITE_DTR 0x0100
359 #define CONTROL_WRITE_RTS 0x0200
360
361 /* CP210X_VENDOR_SPECIFIC values */
362 #define CP210X_READ_2NCONFIG 0x000E
363 #define CP210X_READ_LATCH 0x00C2
364 #define CP210X_GET_PARTNUM 0x370B
365 #define CP210X_GET_PORTCONFIG 0x370C
366 #define CP210X_GET_DEVICEMODE 0x3711
367 #define CP210X_WRITE_LATCH 0x37E1
368
369 /* Part number definitions */
370 #define CP210X_PARTNUM_CP2101 0x01
371 #define CP210X_PARTNUM_CP2102 0x02
372 #define CP210X_PARTNUM_CP2103 0x03
373 #define CP210X_PARTNUM_CP2104 0x04
374 #define CP210X_PARTNUM_CP2105 0x05
375 #define CP210X_PARTNUM_CP2108 0x08
376 #define CP210X_PARTNUM_CP2102N_QFN28 0x20
377 #define CP210X_PARTNUM_CP2102N_QFN24 0x21
378 #define CP210X_PARTNUM_CP2102N_QFN20 0x22
379 #define CP210X_PARTNUM_UNKNOWN 0xFF
380
381 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
382 struct cp210x_comm_status {
383 __le32 ulErrors;
384 __le32 ulHoldReasons;
385 __le32 ulAmountInInQueue;
386 __le32 ulAmountInOutQueue;
387 u8 bEofReceived;
388 u8 bWaitForImmediate;
389 u8 bReserved;
390 } __packed;
391
392 /*
393 * CP210X_PURGE - 16 bits passed in wValue of USB request.
394 * SiLabs app note AN571 gives a strange description of the 4 bits:
395 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
396 * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
397 */
398 #define PURGE_ALL 0x000f
399
400 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
401 struct cp210x_flow_ctl {
402 __le32 ulControlHandshake;
403 __le32 ulFlowReplace;
404 __le32 ulXonLimit;
405 __le32 ulXoffLimit;
406 } __packed;
407
408 /* cp210x_flow_ctl::ulControlHandshake */
409 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0)
410 #define CP210X_SERIAL_DTR_SHIFT(_mode) (_mode)
411 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3)
412 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4)
413 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5)
414 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6)
415
416 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */
417 #define CP210X_SERIAL_DTR_INACTIVE 0
418 #define CP210X_SERIAL_DTR_ACTIVE 1
419 #define CP210X_SERIAL_DTR_FLOW_CTL 2
420
421 /* cp210x_flow_ctl::ulFlowReplace */
422 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0)
423 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1)
424 #define CP210X_SERIAL_ERROR_CHAR BIT(2)
425 #define CP210X_SERIAL_NULL_STRIPPING BIT(3)
426 #define CP210X_SERIAL_BREAK_CHAR BIT(4)
427 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6)
428 #define CP210X_SERIAL_RTS_SHIFT(_mode) (_mode << 6)
429 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31)
430
431 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */
432 #define CP210X_SERIAL_RTS_INACTIVE 0
433 #define CP210X_SERIAL_RTS_ACTIVE 1
434 #define CP210X_SERIAL_RTS_FLOW_CTL 2
435
436 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
437 struct cp210x_pin_mode {
438 u8 eci;
439 u8 sci;
440 } __packed;
441
442 #define CP210X_PIN_MODE_MODEM 0
443 #define CP210X_PIN_MODE_GPIO BIT(0)
444
445 /*
446 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes.
447 * Structure needs padding due to unused/unspecified bytes.
448 */
449 struct cp210x_config {
450 __le16 gpio_mode;
451 u8 __pad0[2];
452 __le16 reset_state;
453 u8 __pad1[4];
454 __le16 suspend_state;
455 u8 sci_cfg;
456 u8 eci_cfg;
457 u8 device_cfg;
458 } __packed;
459
460 /* GPIO modes */
461 #define CP210X_SCI_GPIO_MODE_OFFSET 9
462 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9)
463
464 #define CP210X_ECI_GPIO_MODE_OFFSET 2
465 #define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2)
466
467 /* CP2105 port configuration values */
468 #define CP2105_GPIO0_TXLED_MODE BIT(0)
469 #define CP2105_GPIO1_RXLED_MODE BIT(1)
470 #define CP2105_GPIO1_RS485_MODE BIT(2)
471
472 /* CP2102N configuration array indices */
473 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX 2
474 #define CP210X_2NCONFIG_GPIO_MODE_IDX 581
475 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587
476 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600
477
478 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */
479 struct cp210x_gpio_write {
480 u8 mask;
481 u8 state;
482 } __packed;
483
484 /*
485 * Helper to get interface number when we only have struct usb_serial.
486 */
487 static u8 cp210x_interface_num(struct usb_serial *serial)
488 {
489 struct usb_host_interface *cur_altsetting;
490
491 cur_altsetting = serial->interface->cur_altsetting;
492
493 return cur_altsetting->desc.bInterfaceNumber;
494 }
495
496 /*
497 * Reads a variable-sized block of CP210X_ registers, identified by req.
498 * Returns data into buf in native USB byte order.
499 */
500 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
501 void *buf, int bufsize)
502 {
503 struct usb_serial *serial = port->serial;
504 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
505 void *dmabuf;
506 int result;
507
508 dmabuf = kmalloc(bufsize, GFP_KERNEL);
509 if (!dmabuf) {
510 /*
511 * FIXME Some callers don't bother to check for error,
512 * at least give them consistent junk until they are fixed
513 */
514 memset(buf, 0, bufsize);
515 return -ENOMEM;
516 }
517
518 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
519 req, REQTYPE_INTERFACE_TO_HOST, 0,
520 port_priv->bInterfaceNumber, dmabuf, bufsize,
521 USB_CTRL_SET_TIMEOUT);
522 if (result == bufsize) {
523 memcpy(buf, dmabuf, bufsize);
524 result = 0;
525 } else {
526 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
527 req, bufsize, result);
528 if (result >= 0)
529 result = -EIO;
530
531 /*
532 * FIXME Some callers don't bother to check for error,
533 * at least give them consistent junk until they are fixed
534 */
535 memset(buf, 0, bufsize);
536 }
537
538 kfree(dmabuf);
539
540 return result;
541 }
542
543 /*
544 * Reads any 32-bit CP210X_ register identified by req.
545 */
546 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val)
547 {
548 __le32 le32_val;
549 int err;
550
551 err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val));
552 if (err) {
553 /*
554 * FIXME Some callers don't bother to check for error,
555 * at least give them consistent junk until they are fixed
556 */
557 *val = 0;
558 return err;
559 }
560
561 *val = le32_to_cpu(le32_val);
562
563 return 0;
564 }
565
566 /*
567 * Reads any 16-bit CP210X_ register identified by req.
568 */
569 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val)
570 {
571 __le16 le16_val;
572 int err;
573
574 err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val));
575 if (err)
576 return err;
577
578 *val = le16_to_cpu(le16_val);
579
580 return 0;
581 }
582
583 /*
584 * Reads any 8-bit CP210X_ register identified by req.
585 */
586 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
587 {
588 return cp210x_read_reg_block(port, req, val, sizeof(*val));
589 }
590
591 /*
592 * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
593 * Returns data into buf in native USB byte order.
594 */
595 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
596 void *buf, int bufsize)
597 {
598 void *dmabuf;
599 int result;
600
601 dmabuf = kmalloc(bufsize, GFP_KERNEL);
602 if (!dmabuf)
603 return -ENOMEM;
604
605 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
606 CP210X_VENDOR_SPECIFIC, type, val,
607 cp210x_interface_num(serial), dmabuf, bufsize,
608 USB_CTRL_GET_TIMEOUT);
609 if (result == bufsize) {
610 memcpy(buf, dmabuf, bufsize);
611 result = 0;
612 } else {
613 dev_err(&serial->interface->dev,
614 "failed to get vendor val 0x%04x size %d: %d\n", val,
615 bufsize, result);
616 if (result >= 0)
617 result = -EIO;
618 }
619
620 kfree(dmabuf);
621
622 return result;
623 }
624
625 /*
626 * Writes any 16-bit CP210X_ register (req) whose value is passed
627 * entirely in the wValue field of the USB request.
628 */
629 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
630 {
631 struct usb_serial *serial = port->serial;
632 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
633 int result;
634
635 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
636 req, REQTYPE_HOST_TO_INTERFACE, val,
637 port_priv->bInterfaceNumber, NULL, 0,
638 USB_CTRL_SET_TIMEOUT);
639 if (result < 0) {
640 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
641 req, result);
642 }
643
644 return result;
645 }
646
647 /*
648 * Writes a variable-sized block of CP210X_ registers, identified by req.
649 * Data in buf must be in native USB byte order.
650 */
651 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
652 void *buf, int bufsize)
653 {
654 struct usb_serial *serial = port->serial;
655 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
656 void *dmabuf;
657 int result;
658
659 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
660 if (!dmabuf)
661 return -ENOMEM;
662
663 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
664 req, REQTYPE_HOST_TO_INTERFACE, 0,
665 port_priv->bInterfaceNumber, dmabuf, bufsize,
666 USB_CTRL_SET_TIMEOUT);
667
668 kfree(dmabuf);
669
670 if (result == bufsize) {
671 result = 0;
672 } else {
673 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
674 req, bufsize, result);
675 if (result >= 0)
676 result = -EIO;
677 }
678
679 return result;
680 }
681
682 /*
683 * Writes any 32-bit CP210X_ register identified by req.
684 */
685 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
686 {
687 __le32 le32_val;
688
689 le32_val = cpu_to_le32(val);
690
691 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
692 }
693
694 #ifdef CONFIG_GPIOLIB
695 /*
696 * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
697 * Data in buf must be in native USB byte order.
698 */
699 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
700 u16 val, void *buf, int bufsize)
701 {
702 void *dmabuf;
703 int result;
704
705 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
706 if (!dmabuf)
707 return -ENOMEM;
708
709 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
710 CP210X_VENDOR_SPECIFIC, type, val,
711 cp210x_interface_num(serial), dmabuf, bufsize,
712 USB_CTRL_SET_TIMEOUT);
713
714 kfree(dmabuf);
715
716 if (result == bufsize) {
717 result = 0;
718 } else {
719 dev_err(&serial->interface->dev,
720 "failed to set vendor val 0x%04x size %d: %d\n", val,
721 bufsize, result);
722 if (result >= 0)
723 result = -EIO;
724 }
725
726 return result;
727 }
728 #endif
729
730 /*
731 * Detect CP2108 GET_LINE_CTL bug and activate workaround.
732 * Write a known good value 0x800, read it back.
733 * If it comes back swapped the bug is detected.
734 * Preserve the original register value.
735 */
736 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
737 {
738 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
739 u16 line_ctl_save;
740 u16 line_ctl_test;
741 int err;
742
743 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save);
744 if (err)
745 return err;
746
747 err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800);
748 if (err)
749 return err;
750
751 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test);
752 if (err)
753 return err;
754
755 if (line_ctl_test == 8) {
756 port_priv->has_swapped_line_ctl = true;
757 line_ctl_save = swab16(line_ctl_save);
758 }
759
760 return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save);
761 }
762
763 /*
764 * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL)
765 * to workaround cp2108 bug and get correct value.
766 */
767 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl)
768 {
769 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
770 int err;
771
772 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl);
773 if (err)
774 return err;
775
776 /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
777 if (port_priv->has_swapped_line_ctl)
778 *ctl = swab16(*ctl);
779
780 return 0;
781 }
782
783 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
784 {
785 int result;
786
787 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
788 if (result) {
789 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
790 return result;
791 }
792
793 /* Configure the termios structure */
794 cp210x_get_termios(tty, port);
795
796 /* The baud rate must be initialised on cp2104 */
797 if (tty)
798 cp210x_change_speed(tty, port, NULL);
799
800 return usb_serial_generic_open(tty, port);
801 }
802
803 static void cp210x_close(struct usb_serial_port *port)
804 {
805 usb_serial_generic_close(port);
806
807 /* Clear both queues; cp2108 needs this to avoid an occasional hang */
808 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
809
810 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
811 }
812
813 /*
814 * Read how many bytes are waiting in the TX queue.
815 */
816 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
817 u32 *count)
818 {
819 struct usb_serial *serial = port->serial;
820 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
821 struct cp210x_comm_status *sts;
822 int result;
823
824 sts = kmalloc(sizeof(*sts), GFP_KERNEL);
825 if (!sts)
826 return -ENOMEM;
827
828 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
829 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
830 0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
831 USB_CTRL_GET_TIMEOUT);
832 if (result == sizeof(*sts)) {
833 *count = le32_to_cpu(sts->ulAmountInOutQueue);
834 result = 0;
835 } else {
836 dev_err(&port->dev, "failed to get comm status: %d\n", result);
837 if (result >= 0)
838 result = -EIO;
839 }
840
841 kfree(sts);
842
843 return result;
844 }
845
846 static bool cp210x_tx_empty(struct usb_serial_port *port)
847 {
848 int err;
849 u32 count;
850
851 err = cp210x_get_tx_queue_byte_count(port, &count);
852 if (err)
853 return true;
854
855 return !count;
856 }
857
858 /*
859 * cp210x_get_termios
860 * Reads the baud rate, data bits, parity, stop bits and flow control mode
861 * from the device, corrects any unsupported values, and configures the
862 * termios structure to reflect the state of the device
863 */
864 static void cp210x_get_termios(struct tty_struct *tty,
865 struct usb_serial_port *port)
866 {
867 unsigned int baud;
868
869 if (tty) {
870 cp210x_get_termios_port(tty->driver_data,
871 &tty->termios.c_cflag, &baud);
872 tty_encode_baud_rate(tty, baud, baud);
873 } else {
874 tcflag_t cflag;
875 cflag = 0;
876 cp210x_get_termios_port(port, &cflag, &baud);
877 }
878 }
879
880 /*
881 * cp210x_get_termios_port
882 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
883 */
884 static void cp210x_get_termios_port(struct usb_serial_port *port,
885 tcflag_t *cflagp, unsigned int *baudp)
886 {
887 struct device *dev = &port->dev;
888 tcflag_t cflag;
889 struct cp210x_flow_ctl flow_ctl;
890 u32 baud;
891 u16 bits;
892 u32 ctl_hs;
893
894 cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud);
895
896 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
897 *baudp = baud;
898
899 cflag = *cflagp;
900
901 cp210x_get_line_ctl(port, &bits);
902 cflag &= ~CSIZE;
903 switch (bits & BITS_DATA_MASK) {
904 case BITS_DATA_5:
905 dev_dbg(dev, "%s - data bits = 5\n", __func__);
906 cflag |= CS5;
907 break;
908 case BITS_DATA_6:
909 dev_dbg(dev, "%s - data bits = 6\n", __func__);
910 cflag |= CS6;
911 break;
912 case BITS_DATA_7:
913 dev_dbg(dev, "%s - data bits = 7\n", __func__);
914 cflag |= CS7;
915 break;
916 case BITS_DATA_8:
917 dev_dbg(dev, "%s - data bits = 8\n", __func__);
918 cflag |= CS8;
919 break;
920 case BITS_DATA_9:
921 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
922 cflag |= CS8;
923 bits &= ~BITS_DATA_MASK;
924 bits |= BITS_DATA_8;
925 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
926 break;
927 default:
928 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
929 cflag |= CS8;
930 bits &= ~BITS_DATA_MASK;
931 bits |= BITS_DATA_8;
932 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
933 break;
934 }
935
936 switch (bits & BITS_PARITY_MASK) {
937 case BITS_PARITY_NONE:
938 dev_dbg(dev, "%s - parity = NONE\n", __func__);
939 cflag &= ~PARENB;
940 break;
941 case BITS_PARITY_ODD:
942 dev_dbg(dev, "%s - parity = ODD\n", __func__);
943 cflag |= (PARENB|PARODD);
944 break;
945 case BITS_PARITY_EVEN:
946 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
947 cflag &= ~PARODD;
948 cflag |= PARENB;
949 break;
950 case BITS_PARITY_MARK:
951 dev_dbg(dev, "%s - parity = MARK\n", __func__);
952 cflag |= (PARENB|PARODD|CMSPAR);
953 break;
954 case BITS_PARITY_SPACE:
955 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
956 cflag &= ~PARODD;
957 cflag |= (PARENB|CMSPAR);
958 break;
959 default:
960 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
961 cflag &= ~PARENB;
962 bits &= ~BITS_PARITY_MASK;
963 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
964 break;
965 }
966
967 cflag &= ~CSTOPB;
968 switch (bits & BITS_STOP_MASK) {
969 case BITS_STOP_1:
970 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
971 break;
972 case BITS_STOP_1_5:
973 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
974 bits &= ~BITS_STOP_MASK;
975 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
976 break;
977 case BITS_STOP_2:
978 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
979 cflag |= CSTOPB;
980 break;
981 default:
982 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
983 bits &= ~BITS_STOP_MASK;
984 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
985 break;
986 }
987
988 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
989 sizeof(flow_ctl));
990 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
991 if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) {
992 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
993 cflag |= CRTSCTS;
994 } else {
995 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
996 cflag &= ~CRTSCTS;
997 }
998
999 *cflagp = cflag;
1000 }
1001
1002 struct cp210x_rate {
1003 speed_t rate;
1004 speed_t high;
1005 };
1006
1007 static const struct cp210x_rate cp210x_an205_table1[] = {
1008 { 300, 300 },
1009 { 600, 600 },
1010 { 1200, 1200 },
1011 { 1800, 1800 },
1012 { 2400, 2400 },
1013 { 4000, 4000 },
1014 { 4800, 4803 },
1015 { 7200, 7207 },
1016 { 9600, 9612 },
1017 { 14400, 14428 },
1018 { 16000, 16062 },
1019 { 19200, 19250 },
1020 { 28800, 28912 },
1021 { 38400, 38601 },
1022 { 51200, 51558 },
1023 { 56000, 56280 },
1024 { 57600, 58053 },
1025 { 64000, 64111 },
1026 { 76800, 77608 },
1027 { 115200, 117028 },
1028 { 128000, 129347 },
1029 { 153600, 156868 },
1030 { 230400, 237832 },
1031 { 250000, 254234 },
1032 { 256000, 273066 },
1033 { 460800, 491520 },
1034 { 500000, 567138 },
1035 { 576000, 670254 },
1036 { 921600, UINT_MAX }
1037 };
1038
1039 /*
1040 * Quantises the baud rate as per AN205 Table 1
1041 */
1042 static speed_t cp210x_get_an205_rate(speed_t baud)
1043 {
1044 int i;
1045
1046 for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) {
1047 if (baud <= cp210x_an205_table1[i].high)
1048 break;
1049 }
1050
1051 return cp210x_an205_table1[i].rate;
1052 }
1053
1054 static speed_t cp210x_get_actual_rate(struct usb_serial *serial, speed_t baud)
1055 {
1056 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1057 unsigned int prescale = 1;
1058 unsigned int div;
1059
1060 baud = clamp(baud, 300u, priv->max_speed);
1061
1062 if (baud <= 365)
1063 prescale = 4;
1064
1065 div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud);
1066 baud = 48000000 / (2 * prescale * div);
1067
1068 return baud;
1069 }
1070
1071 /*
1072 * CP2101 supports the following baud rates:
1073 *
1074 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
1075 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
1076 *
1077 * CP2102 and CP2103 support the following additional rates:
1078 *
1079 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
1080 * 576000
1081 *
1082 * The device will map a requested rate to a supported one, but the result
1083 * of requests for rates greater than 1053257 is undefined (see AN205).
1084 *
1085 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
1086 * respectively, with an error less than 1%. The actual rates are determined
1087 * by
1088 *
1089 * div = round(freq / (2 x prescale x request))
1090 * actual = freq / (2 x prescale x div)
1091 *
1092 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1093 * or 1 otherwise.
1094 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1095 * otherwise.
1096 */
1097 static void cp210x_change_speed(struct tty_struct *tty,
1098 struct usb_serial_port *port, struct ktermios *old_termios)
1099 {
1100 struct usb_serial *serial = port->serial;
1101 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1102 u32 baud;
1103
1104 baud = tty->termios.c_ospeed;
1105
1106 /*
1107 * This maps the requested rate to the actual rate, a valid rate on
1108 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed].
1109 *
1110 * NOTE: B0 is not implemented.
1111 */
1112 if (priv->use_actual_rate)
1113 baud = cp210x_get_actual_rate(serial, baud);
1114 else if (baud < 1000000)
1115 baud = cp210x_get_an205_rate(baud);
1116 else if (baud > priv->max_speed)
1117 baud = priv->max_speed;
1118
1119 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1120 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1121 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1122 if (old_termios)
1123 baud = old_termios->c_ospeed;
1124 else
1125 baud = 9600;
1126 }
1127
1128 tty_encode_baud_rate(tty, baud, baud);
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 device *dev = &port->dev;
1135 unsigned int cflag, old_cflag;
1136 u16 bits;
1137
1138 cflag = tty->termios.c_cflag;
1139 old_cflag = old_termios->c_cflag;
1140
1141 if (tty->termios.c_ospeed != old_termios->c_ospeed)
1142 cp210x_change_speed(tty, port, old_termios);
1143
1144 /* If the number of data bits is to be updated */
1145 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
1146 cp210x_get_line_ctl(port, &bits);
1147 bits &= ~BITS_DATA_MASK;
1148 switch (cflag & CSIZE) {
1149 case CS5:
1150 bits |= BITS_DATA_5;
1151 dev_dbg(dev, "%s - data bits = 5\n", __func__);
1152 break;
1153 case CS6:
1154 bits |= BITS_DATA_6;
1155 dev_dbg(dev, "%s - data bits = 6\n", __func__);
1156 break;
1157 case CS7:
1158 bits |= BITS_DATA_7;
1159 dev_dbg(dev, "%s - data bits = 7\n", __func__);
1160 break;
1161 case CS8:
1162 default:
1163 bits |= BITS_DATA_8;
1164 dev_dbg(dev, "%s - data bits = 8\n", __func__);
1165 break;
1166 }
1167 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1168 dev_dbg(dev, "Number of data bits requested not supported by device\n");
1169 }
1170
1171 if ((cflag & (PARENB|PARODD|CMSPAR)) !=
1172 (old_cflag & (PARENB|PARODD|CMSPAR))) {
1173 cp210x_get_line_ctl(port, &bits);
1174 bits &= ~BITS_PARITY_MASK;
1175 if (cflag & PARENB) {
1176 if (cflag & CMSPAR) {
1177 if (cflag & PARODD) {
1178 bits |= BITS_PARITY_MARK;
1179 dev_dbg(dev, "%s - parity = MARK\n", __func__);
1180 } else {
1181 bits |= BITS_PARITY_SPACE;
1182 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
1183 }
1184 } else {
1185 if (cflag & PARODD) {
1186 bits |= BITS_PARITY_ODD;
1187 dev_dbg(dev, "%s - parity = ODD\n", __func__);
1188 } else {
1189 bits |= BITS_PARITY_EVEN;
1190 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
1191 }
1192 }
1193 }
1194 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1195 dev_dbg(dev, "Parity mode not supported by device\n");
1196 }
1197
1198 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
1199 cp210x_get_line_ctl(port, &bits);
1200 bits &= ~BITS_STOP_MASK;
1201 if (cflag & CSTOPB) {
1202 bits |= BITS_STOP_2;
1203 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1204 } else {
1205 bits |= BITS_STOP_1;
1206 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
1207 }
1208 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1209 dev_dbg(dev, "Number of stop bits requested not supported by device\n");
1210 }
1211
1212 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
1213 struct cp210x_flow_ctl flow_ctl;
1214 u32 ctl_hs;
1215 u32 flow_repl;
1216
1217 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1218 sizeof(flow_ctl));
1219 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1220 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1221 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1222 __func__, ctl_hs, flow_repl);
1223
1224 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1225 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1226 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1227 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1228 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE);
1229 if (cflag & CRTSCTS) {
1230 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1231
1232 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1233 flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1234 CP210X_SERIAL_RTS_FLOW_CTL);
1235 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1236 } else {
1237 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1238
1239 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1240 flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1241 CP210X_SERIAL_RTS_ACTIVE);
1242 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1243 }
1244
1245 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1246 __func__, ctl_hs, flow_repl);
1247 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1248 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1249 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1250 sizeof(flow_ctl));
1251 }
1252
1253 }
1254
1255 static int cp210x_tiocmset(struct tty_struct *tty,
1256 unsigned int set, unsigned int clear)
1257 {
1258 struct usb_serial_port *port = tty->driver_data;
1259 return cp210x_tiocmset_port(port, set, clear);
1260 }
1261
1262 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1263 unsigned int set, unsigned int clear)
1264 {
1265 u16 control = 0;
1266
1267 if (set & TIOCM_RTS) {
1268 control |= CONTROL_RTS;
1269 control |= CONTROL_WRITE_RTS;
1270 }
1271 if (set & TIOCM_DTR) {
1272 control |= CONTROL_DTR;
1273 control |= CONTROL_WRITE_DTR;
1274 }
1275 if (clear & TIOCM_RTS) {
1276 control &= ~CONTROL_RTS;
1277 control |= CONTROL_WRITE_RTS;
1278 }
1279 if (clear & TIOCM_DTR) {
1280 control &= ~CONTROL_DTR;
1281 control |= CONTROL_WRITE_DTR;
1282 }
1283
1284 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
1285
1286 return cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1287 }
1288
1289 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
1290 {
1291 if (on)
1292 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
1293 else
1294 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
1295 }
1296
1297 static int cp210x_tiocmget(struct tty_struct *tty)
1298 {
1299 struct usb_serial_port *port = tty->driver_data;
1300 u8 control;
1301 int result;
1302
1303 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1304 if (result)
1305 return result;
1306
1307 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1308 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1309 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1310 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1311 |((control & CONTROL_RING)? TIOCM_RI : 0)
1312 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
1313
1314 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
1315
1316 return result;
1317 }
1318
1319 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1320 {
1321 struct usb_serial_port *port = tty->driver_data;
1322 u16 state;
1323
1324 if (break_state == 0)
1325 state = BREAK_OFF;
1326 else
1327 state = BREAK_ON;
1328 dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1329 state == BREAK_OFF ? "off" : "on");
1330 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1331 }
1332
1333 #ifdef CONFIG_GPIOLIB
1334 static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset)
1335 {
1336 struct usb_serial *serial = gpiochip_get_data(gc);
1337 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1338
1339 if (priv->gpio_altfunc & BIT(offset))
1340 return -ENODEV;
1341
1342 return 0;
1343 }
1344
1345 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1346 {
1347 struct usb_serial *serial = gpiochip_get_data(gc);
1348 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1349 u8 req_type = REQTYPE_DEVICE_TO_HOST;
1350 int result;
1351 u8 buf;
1352
1353 if (priv->partnum == CP210X_PARTNUM_CP2105)
1354 req_type = REQTYPE_INTERFACE_TO_HOST;
1355
1356 result = cp210x_read_vendor_block(serial, req_type,
1357 CP210X_READ_LATCH, &buf, sizeof(buf));
1358 if (result < 0)
1359 return result;
1360
1361 return !!(buf & BIT(gpio));
1362 }
1363
1364 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1365 {
1366 struct usb_serial *serial = gpiochip_get_data(gc);
1367 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1368 struct cp210x_gpio_write buf;
1369 int result;
1370
1371 if (value == 1)
1372 buf.state = BIT(gpio);
1373 else
1374 buf.state = 0;
1375
1376 buf.mask = BIT(gpio);
1377
1378 if (priv->partnum == CP210X_PARTNUM_CP2105) {
1379 result = cp210x_write_vendor_block(serial,
1380 REQTYPE_HOST_TO_INTERFACE,
1381 CP210X_WRITE_LATCH, &buf,
1382 sizeof(buf));
1383 } else {
1384 u16 wIndex = buf.state << 8 | buf.mask;
1385
1386 result = usb_control_msg(serial->dev,
1387 usb_sndctrlpipe(serial->dev, 0),
1388 CP210X_VENDOR_SPECIFIC,
1389 REQTYPE_HOST_TO_DEVICE,
1390 CP210X_WRITE_LATCH,
1391 wIndex,
1392 NULL, 0, USB_CTRL_SET_TIMEOUT);
1393 }
1394
1395 if (result < 0) {
1396 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n",
1397 result);
1398 }
1399 }
1400
1401 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1402 {
1403 struct usb_serial *serial = gpiochip_get_data(gc);
1404 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1405
1406 return priv->gpio_input & BIT(gpio);
1407 }
1408
1409 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
1410 {
1411 struct usb_serial *serial = gpiochip_get_data(gc);
1412 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1413
1414 if (priv->partnum == CP210X_PARTNUM_CP2105) {
1415 /* hardware does not support an input mode */
1416 return -ENOTSUPP;
1417 }
1418
1419 /* push-pull pins cannot be changed to be inputs */
1420 if (priv->gpio_pushpull & BIT(gpio))
1421 return -EINVAL;
1422
1423 /* make sure to release pin if it is being driven low */
1424 cp210x_gpio_set(gc, gpio, 1);
1425
1426 priv->gpio_input |= BIT(gpio);
1427
1428 return 0;
1429 }
1430
1431 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1432 int value)
1433 {
1434 struct usb_serial *serial = gpiochip_get_data(gc);
1435 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1436
1437 priv->gpio_input &= ~BIT(gpio);
1438 cp210x_gpio_set(gc, gpio, value);
1439
1440 return 0;
1441 }
1442
1443 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
1444 unsigned long config)
1445 {
1446 struct usb_serial *serial = gpiochip_get_data(gc);
1447 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1448 enum pin_config_param param = pinconf_to_config_param(config);
1449
1450 /* Succeed only if in correct mode (this can't be set at runtime) */
1451 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) &&
1452 (priv->gpio_pushpull & BIT(gpio)))
1453 return 0;
1454
1455 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) &&
1456 !(priv->gpio_pushpull & BIT(gpio)))
1457 return 0;
1458
1459 return -ENOTSUPP;
1460 }
1461
1462 /*
1463 * This function is for configuring GPIO using shared pins, where other signals
1464 * are made unavailable by configuring the use of GPIO. This is believed to be
1465 * only applicable to the cp2105 at this point, the other devices supported by
1466 * this driver that provide GPIO do so in a way that does not impact other
1467 * signals and are thus expected to have very different initialisation.
1468 */
1469 static int cp2105_gpioconf_init(struct usb_serial *serial)
1470 {
1471 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1472 struct cp210x_pin_mode mode;
1473 struct cp210x_config config;
1474 u8 intf_num = cp210x_interface_num(serial);
1475 u8 iface_config;
1476 int result;
1477
1478 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1479 CP210X_GET_DEVICEMODE, &mode,
1480 sizeof(mode));
1481 if (result < 0)
1482 return result;
1483
1484 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1485 CP210X_GET_PORTCONFIG, &config,
1486 sizeof(config));
1487 if (result < 0)
1488 return result;
1489
1490 /* 2 banks of GPIO - One for the pins taken from each serial port */
1491 if (intf_num == 0) {
1492 if (mode.eci == CP210X_PIN_MODE_MODEM) {
1493 /* mark all GPIOs of this interface as reserved */
1494 priv->gpio_altfunc = 0xff;
1495 return 0;
1496 }
1497
1498 iface_config = config.eci_cfg;
1499 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1500 CP210X_ECI_GPIO_MODE_MASK) >>
1501 CP210X_ECI_GPIO_MODE_OFFSET);
1502 priv->gc.ngpio = 2;
1503 } else if (intf_num == 1) {
1504 if (mode.sci == CP210X_PIN_MODE_MODEM) {
1505 /* mark all GPIOs of this interface as reserved */
1506 priv->gpio_altfunc = 0xff;
1507 return 0;
1508 }
1509
1510 iface_config = config.sci_cfg;
1511 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1512 CP210X_SCI_GPIO_MODE_MASK) >>
1513 CP210X_SCI_GPIO_MODE_OFFSET);
1514 priv->gc.ngpio = 3;
1515 } else {
1516 return -ENODEV;
1517 }
1518
1519 /* mark all pins which are not in GPIO mode */
1520 if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */
1521 priv->gpio_altfunc |= BIT(0);
1522 if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */
1523 CP2105_GPIO1_RS485_MODE))
1524 priv->gpio_altfunc |= BIT(1);
1525
1526 /* driver implementation for CP2105 only supports outputs */
1527 priv->gpio_input = 0;
1528
1529 return 0;
1530 }
1531
1532 static int cp2102n_gpioconf_init(struct usb_serial *serial)
1533 {
1534 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1535 const u16 config_size = 0x02a6;
1536 u8 gpio_rst_latch;
1537 u8 config_version;
1538 u8 gpio_pushpull;
1539 u8 *config_buf;
1540 u8 gpio_latch;
1541 u8 gpio_ctrl;
1542 int result;
1543 u8 i;
1544
1545 /*
1546 * Retrieve device configuration from the device.
1547 * The array received contains all customization settings done at the
1548 * factory/manufacturer. Format of the array is documented at the
1549 * time of writing at:
1550 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa
1551 */
1552 config_buf = kmalloc(config_size, GFP_KERNEL);
1553 if (!config_buf)
1554 return -ENOMEM;
1555
1556 result = cp210x_read_vendor_block(serial,
1557 REQTYPE_DEVICE_TO_HOST,
1558 CP210X_READ_2NCONFIG,
1559 config_buf,
1560 config_size);
1561 if (result < 0) {
1562 kfree(config_buf);
1563 return result;
1564 }
1565
1566 config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX];
1567 gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX];
1568 gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX];
1569 gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX];
1570
1571 kfree(config_buf);
1572
1573 /* Make sure this is a config format we understand. */
1574 if (config_version != 0x01)
1575 return -ENOTSUPP;
1576
1577 /*
1578 * We only support 4 GPIOs even on the QFN28 package, because
1579 * config locations of GPIOs 4-6 determined using reverse
1580 * engineering revealed conflicting offsets with other
1581 * documented functions. So we'll just play it safe for now.
1582 */
1583 priv->gc.ngpio = 4;
1584
1585 /*
1586 * Get default pin states after reset. Needed so we can determine
1587 * the direction of an open-drain pin.
1588 */
1589 gpio_latch = (gpio_rst_latch >> 3) & 0x0f;
1590
1591 /* 0 indicates open-drain mode, 1 is push-pull */
1592 priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f;
1593
1594 /* 0 indicates GPIO mode, 1 is alternate function */
1595 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f;
1596
1597 /*
1598 * The CP2102N does not strictly has input and output pin modes,
1599 * it only knows open-drain and push-pull modes which is set at
1600 * factory. An open-drain pin can function both as an
1601 * input or an output. We emulate input mode for open-drain pins
1602 * by making sure they are not driven low, and we do not allow
1603 * push-pull pins to be set as an input.
1604 */
1605 for (i = 0; i < priv->gc.ngpio; ++i) {
1606 /*
1607 * Set direction to "input" iff pin is open-drain and reset
1608 * value is 1.
1609 */
1610 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1611 priv->gpio_input |= BIT(i);
1612 }
1613
1614 return 0;
1615 }
1616
1617 static int cp210x_gpio_init(struct usb_serial *serial)
1618 {
1619 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1620 int result;
1621
1622 switch (priv->partnum) {
1623 case CP210X_PARTNUM_CP2105:
1624 result = cp2105_gpioconf_init(serial);
1625 break;
1626 case CP210X_PARTNUM_CP2102N_QFN28:
1627 case CP210X_PARTNUM_CP2102N_QFN24:
1628 case CP210X_PARTNUM_CP2102N_QFN20:
1629 result = cp2102n_gpioconf_init(serial);
1630 break;
1631 default:
1632 return 0;
1633 }
1634
1635 if (result < 0)
1636 return result;
1637
1638 priv->gc.label = "cp210x";
1639 priv->gc.request = cp210x_gpio_request;
1640 priv->gc.get_direction = cp210x_gpio_direction_get;
1641 priv->gc.direction_input = cp210x_gpio_direction_input;
1642 priv->gc.direction_output = cp210x_gpio_direction_output;
1643 priv->gc.get = cp210x_gpio_get;
1644 priv->gc.set = cp210x_gpio_set;
1645 priv->gc.set_config = cp210x_gpio_set_config;
1646 priv->gc.owner = THIS_MODULE;
1647 priv->gc.parent = &serial->interface->dev;
1648 priv->gc.base = -1;
1649 priv->gc.can_sleep = true;
1650
1651 result = gpiochip_add_data(&priv->gc, serial);
1652 if (!result)
1653 priv->gpio_registered = true;
1654
1655 return result;
1656 }
1657
1658 static void cp210x_gpio_remove(struct usb_serial *serial)
1659 {
1660 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1661
1662 if (priv->gpio_registered) {
1663 gpiochip_remove(&priv->gc);
1664 priv->gpio_registered = false;
1665 }
1666 }
1667
1668 #else
1669
1670 static int cp210x_gpio_init(struct usb_serial *serial)
1671 {
1672 return 0;
1673 }
1674
1675 static void cp210x_gpio_remove(struct usb_serial *serial)
1676 {
1677 /* Nothing to do */
1678 }
1679
1680 #endif
1681
1682 static int cp210x_port_probe(struct usb_serial_port *port)
1683 {
1684 struct usb_serial *serial = port->serial;
1685 struct cp210x_port_private *port_priv;
1686 int ret;
1687
1688 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1689 if (!port_priv)
1690 return -ENOMEM;
1691
1692 port_priv->bInterfaceNumber = cp210x_interface_num(serial);
1693
1694 usb_set_serial_port_data(port, port_priv);
1695
1696 ret = cp210x_detect_swapped_line_ctl(port);
1697 if (ret) {
1698 kfree(port_priv);
1699 return ret;
1700 }
1701
1702 return 0;
1703 }
1704
1705 static int cp210x_port_remove(struct usb_serial_port *port)
1706 {
1707 struct cp210x_port_private *port_priv;
1708
1709 port_priv = usb_get_serial_port_data(port);
1710 kfree(port_priv);
1711
1712 return 0;
1713 }
1714
1715 static void cp210x_init_max_speed(struct usb_serial *serial)
1716 {
1717 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1718 bool use_actual_rate = false;
1719 speed_t max;
1720
1721 switch (priv->partnum) {
1722 case CP210X_PARTNUM_CP2101:
1723 max = 921600;
1724 break;
1725 case CP210X_PARTNUM_CP2102:
1726 case CP210X_PARTNUM_CP2103:
1727 max = 1000000;
1728 break;
1729 case CP210X_PARTNUM_CP2104:
1730 use_actual_rate = true;
1731 max = 2000000;
1732 break;
1733 case CP210X_PARTNUM_CP2108:
1734 max = 2000000;
1735 break;
1736 case CP210X_PARTNUM_CP2105:
1737 if (cp210x_interface_num(serial) == 0) {
1738 use_actual_rate = true;
1739 max = 2000000; /* ECI */
1740 } else {
1741 max = 921600; /* SCI */
1742 }
1743 break;
1744 case CP210X_PARTNUM_CP2102N_QFN28:
1745 case CP210X_PARTNUM_CP2102N_QFN24:
1746 case CP210X_PARTNUM_CP2102N_QFN20:
1747 use_actual_rate = true;
1748 max = 3000000;
1749 break;
1750 default:
1751 max = 2000000;
1752 break;
1753 }
1754
1755 priv->max_speed = max;
1756 priv->use_actual_rate = use_actual_rate;
1757 }
1758
1759 static int cp210x_attach(struct usb_serial *serial)
1760 {
1761 int result;
1762 struct cp210x_serial_private *priv;
1763
1764 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1765 if (!priv)
1766 return -ENOMEM;
1767
1768 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1769 CP210X_GET_PARTNUM, &priv->partnum,
1770 sizeof(priv->partnum));
1771 if (result < 0) {
1772 dev_warn(&serial->interface->dev,
1773 "querying part number failed\n");
1774 priv->partnum = CP210X_PARTNUM_UNKNOWN;
1775 }
1776
1777 usb_set_serial_data(serial, priv);
1778
1779 cp210x_init_max_speed(serial);
1780
1781 result = cp210x_gpio_init(serial);
1782 if (result < 0) {
1783 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n",
1784 result);
1785 }
1786
1787 return 0;
1788 }
1789
1790 static void cp210x_disconnect(struct usb_serial *serial)
1791 {
1792 cp210x_gpio_remove(serial);
1793 }
1794
1795 static void cp210x_release(struct usb_serial *serial)
1796 {
1797 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1798
1799 cp210x_gpio_remove(serial);
1800
1801 kfree(priv);
1802 }
1803
1804 module_usb_serial_driver(serial_drivers, id_table);
1805
1806 MODULE_DESCRIPTION(DRIVER_DESC);
1807 MODULE_LICENSE("GPL v2");
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