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 * Copyright (C) 2010-2021 Johan Hovold (johan@kernel.org)
7 *
8 * Support to set flow control line levels using TIOCMGET and TIOCMSET
9 * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow
10 * control thanks to Munir Nassar nassarmu@real-time.com
11 *
12 */
13
14 #include <linux/kernel.h>
15 #include <linux/errno.h>
16 #include <linux/slab.h>
17 #include <linux/tty.h>
18 #include <linux/tty_flip.h>
19 #include <linux/module.h>
20 #include <linux/usb.h>
21 #include <linux/usb/serial.h>
22 #include <linux/gpio/driver.h>
23 #include <linux/bitops.h>
24 #include <linux/mutex.h>
25
26 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
27
28 /*
29 * Function Prototypes
30 */
31 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
32 static void cp210x_close(struct usb_serial_port *);
33 static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *,
34 const struct ktermios *);
35 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
36 const struct ktermios *);
37 static bool cp210x_tx_empty(struct usb_serial_port *port);
38 static int cp210x_tiocmget(struct tty_struct *);
39 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
40 static int cp210x_tiocmset_port(struct usb_serial_port *port,
41 unsigned int, unsigned int);
42 static void cp210x_break_ctl(struct tty_struct *, int);
43 static int cp210x_attach(struct usb_serial *);
44 static void cp210x_disconnect(struct usb_serial *);
45 static void cp210x_release(struct usb_serial *);
46 static int cp210x_port_probe(struct usb_serial_port *);
47 static void cp210x_port_remove(struct usb_serial_port *);
48 static void cp210x_dtr_rts(struct usb_serial_port *port, int on);
49 static void cp210x_process_read_urb(struct urb *urb);
50 static void cp210x_enable_event_mode(struct usb_serial_port *port);
51 static void cp210x_disable_event_mode(struct usb_serial_port *port);
52
53 static const struct usb_device_id id_table[] = {
54 { USB_DEVICE(0x0404, 0x034C) }, /* NCR Retail IO Box */
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, 0x0070) }, /* Siemens SCALANCE LPE-9000 USB Serial Console */
64 { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */
65 { USB_DEVICE(0x0988, 0x0578) }, /* Teraoka AD2000 */
66 { USB_DEVICE(0x0B00, 0x3070) }, /* Ingenico 3070 */
67 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
68 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
69 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
70 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
71 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
72 { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */
73 { USB_DEVICE(0x106F, 0x0003) }, /* CPI / Money Controls Bulk Coin Recycler */
74 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
75 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
76 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
77 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
78 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
79 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
80 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
81 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
82 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
83 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
84 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
85 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
86 { USB_DEVICE(0x10C4, 0x8056) }, /* Lorenz Messtechnik devices */
87 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
88 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
89 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
90 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
91 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
92 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
93 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
94 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
95 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
96 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
97 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
98 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
99 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
100 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
101 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
102 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
103 { USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */
104 { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */
105 { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */
106 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
107 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
108 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
109 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
110 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
111 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
112 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
113 { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */
114 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
115 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
116 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
117 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
118 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
119 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
120 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
121 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */
122 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
123 { USB_DEVICE(0x10C4, 0x82AA) }, /* Silicon Labs IFS-USB-DATACABLE used with Quint UPS */
124 { USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */
125 { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */
126 { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */
127 { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */
128 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
129 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
130 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
131 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
132 { USB_DEVICE(0x10C4, 0x83AA) }, /* Mark-10 Digital Force Gauge */
133 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
134 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
135 { USB_DEVICE(0x10C4, 0x8414) }, /* Decagon USB Cable Adapter */
136 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
137 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
138 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */
139 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
140 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
141 { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */
142 { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */
143 { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */
144 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
145 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
146 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
147 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
148 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
149 { USB_DEVICE(0x10C4, 0x87ED) }, /* IMST USB-Stick for Smart Meter */
150 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
151 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
152 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
153 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
154 { USB_DEVICE(0x10C4, 0x88D8) }, /* Acuity Brands nLight Air Adapter */
155 { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */
156 { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */
157 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
158 { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */
159 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
160 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
161 { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */
162 { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */
163 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
164 { USB_DEVICE(0x10C4, 0x8A5B) }, /* CEL EM3588 ZigBee USB Stick */
165 { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */
166 { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */
167 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
168 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
169 { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */
170 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
171 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
172 { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */
173 { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */
174 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
175 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
176 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
177 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
178 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
179 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
180 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
181 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
182 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
183 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
184 { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */
185 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
186 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
187 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
188 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
189 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
190 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
191 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
192 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
193 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
194 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
195 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
196 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
197 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
198 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
199 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
200 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
201 { USB_DEVICE(0x17A8, 0x0011) }, /* Kamstrup 444 MHz RF sniffer */
202 { USB_DEVICE(0x17A8, 0x0013) }, /* Kamstrup 870 MHz RF sniffer */
203 { USB_DEVICE(0x17A8, 0x0101) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Int Ant) */
204 { USB_DEVICE(0x17A8, 0x0102) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Ext Ant) */
205 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
206 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
207 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
208 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
209 { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */
210 { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */
211 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
212 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
213 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
214 { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */
215 { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */
216 { USB_DEVICE(0x1901, 0x0197) }, /* GE CS1000 M.2 Key E serial interface */
217 { USB_DEVICE(0x1901, 0x0198) }, /* GE CS1000 Display serial interface */
218 { USB_DEVICE(0x199B, 0xBA30) }, /* LORD WSDA-200-USB */
219 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
220 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
221 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
222 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
223 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
224 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
225 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
226 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
227 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
228 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
229 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
230 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
231 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
232 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
233 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
234 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
235 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
236 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
237 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
238 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
239 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
240 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
241 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
242 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
243 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
244 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
245 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
246 { USB_DEVICE(0x2184, 0x0030) }, /* GW Instek GDM-834x Digital Multimeter */
247 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
248 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
249 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
250 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
251 { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */
252 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
253 { } /* Terminating Entry */
254 };
255
256 MODULE_DEVICE_TABLE(usb, id_table);
257
258 struct cp210x_serial_private {
259 #ifdef CONFIG_GPIOLIB
260 struct gpio_chip gc;
261 bool gpio_registered;
262 u16 gpio_pushpull;
263 u16 gpio_altfunc;
264 u16 gpio_input;
265 #endif
266 u8 partnum;
267 u32 fw_version;
268 speed_t min_speed;
269 speed_t max_speed;
270 bool use_actual_rate;
271 bool no_flow_control;
272 bool no_event_mode;
273 };
274
275 enum cp210x_event_state {
276 ES_DATA,
277 ES_ESCAPE,
278 ES_LSR,
279 ES_LSR_DATA_0,
280 ES_LSR_DATA_1,
281 ES_MSR
282 };
283
284 struct cp210x_port_private {
285 u8 bInterfaceNumber;
286 bool event_mode;
287 enum cp210x_event_state event_state;
288 u8 lsr;
289
290 struct mutex mutex;
291 bool crtscts;
292 bool dtr;
293 bool rts;
294 };
295
296 static struct usb_serial_driver cp210x_device = {
297 .driver = {
298 .owner = THIS_MODULE,
299 .name = "cp210x",
300 },
301 .id_table = id_table,
302 .num_ports = 1,
303 .bulk_in_size = 256,
304 .bulk_out_size = 256,
305 .open = cp210x_open,
306 .close = cp210x_close,
307 .break_ctl = cp210x_break_ctl,
308 .set_termios = cp210x_set_termios,
309 .tx_empty = cp210x_tx_empty,
310 .throttle = usb_serial_generic_throttle,
311 .unthrottle = usb_serial_generic_unthrottle,
312 .tiocmget = cp210x_tiocmget,
313 .tiocmset = cp210x_tiocmset,
314 .get_icount = usb_serial_generic_get_icount,
315 .attach = cp210x_attach,
316 .disconnect = cp210x_disconnect,
317 .release = cp210x_release,
318 .port_probe = cp210x_port_probe,
319 .port_remove = cp210x_port_remove,
320 .dtr_rts = cp210x_dtr_rts,
321 .process_read_urb = cp210x_process_read_urb,
322 };
323
324 static struct usb_serial_driver * const serial_drivers[] = {
325 &cp210x_device, NULL
326 };
327
328 /* Config request types */
329 #define REQTYPE_HOST_TO_INTERFACE 0x41
330 #define REQTYPE_INTERFACE_TO_HOST 0xc1
331 #define REQTYPE_HOST_TO_DEVICE 0x40
332 #define REQTYPE_DEVICE_TO_HOST 0xc0
333
334 /* Config request codes */
335 #define CP210X_IFC_ENABLE 0x00
336 #define CP210X_SET_BAUDDIV 0x01
337 #define CP210X_GET_BAUDDIV 0x02
338 #define CP210X_SET_LINE_CTL 0x03
339 #define CP210X_GET_LINE_CTL 0x04
340 #define CP210X_SET_BREAK 0x05
341 #define CP210X_IMM_CHAR 0x06
342 #define CP210X_SET_MHS 0x07
343 #define CP210X_GET_MDMSTS 0x08
344 #define CP210X_SET_XON 0x09
345 #define CP210X_SET_XOFF 0x0A
346 #define CP210X_SET_EVENTMASK 0x0B
347 #define CP210X_GET_EVENTMASK 0x0C
348 #define CP210X_SET_CHAR 0x0D
349 #define CP210X_GET_CHARS 0x0E
350 #define CP210X_GET_PROPS 0x0F
351 #define CP210X_GET_COMM_STATUS 0x10
352 #define CP210X_RESET 0x11
353 #define CP210X_PURGE 0x12
354 #define CP210X_SET_FLOW 0x13
355 #define CP210X_GET_FLOW 0x14
356 #define CP210X_EMBED_EVENTS 0x15
357 #define CP210X_GET_EVENTSTATE 0x16
358 #define CP210X_SET_CHARS 0x19
359 #define CP210X_GET_BAUDRATE 0x1D
360 #define CP210X_SET_BAUDRATE 0x1E
361 #define CP210X_VENDOR_SPECIFIC 0xFF
362
363 /* CP210X_IFC_ENABLE */
364 #define UART_ENABLE 0x0001
365 #define UART_DISABLE 0x0000
366
367 /* CP210X_(SET|GET)_BAUDDIV */
368 #define BAUD_RATE_GEN_FREQ 0x384000
369
370 /* CP210X_(SET|GET)_LINE_CTL */
371 #define BITS_DATA_MASK 0X0f00
372 #define BITS_DATA_5 0X0500
373 #define BITS_DATA_6 0X0600
374 #define BITS_DATA_7 0X0700
375 #define BITS_DATA_8 0X0800
376 #define BITS_DATA_9 0X0900
377
378 #define BITS_PARITY_MASK 0x00f0
379 #define BITS_PARITY_NONE 0x0000
380 #define BITS_PARITY_ODD 0x0010
381 #define BITS_PARITY_EVEN 0x0020
382 #define BITS_PARITY_MARK 0x0030
383 #define BITS_PARITY_SPACE 0x0040
384
385 #define BITS_STOP_MASK 0x000f
386 #define BITS_STOP_1 0x0000
387 #define BITS_STOP_1_5 0x0001
388 #define BITS_STOP_2 0x0002
389
390 /* CP210X_SET_BREAK */
391 #define BREAK_ON 0x0001
392 #define BREAK_OFF 0x0000
393
394 /* CP210X_(SET_MHS|GET_MDMSTS) */
395 #define CONTROL_DTR 0x0001
396 #define CONTROL_RTS 0x0002
397 #define CONTROL_CTS 0x0010
398 #define CONTROL_DSR 0x0020
399 #define CONTROL_RING 0x0040
400 #define CONTROL_DCD 0x0080
401 #define CONTROL_WRITE_DTR 0x0100
402 #define CONTROL_WRITE_RTS 0x0200
403
404 /* CP210X_(GET|SET)_CHARS */
405 struct cp210x_special_chars {
406 u8 bEofChar;
407 u8 bErrorChar;
408 u8 bBreakChar;
409 u8 bEventChar;
410 u8 bXonChar;
411 u8 bXoffChar;
412 };
413
414 /* CP210X_VENDOR_SPECIFIC values */
415 #define CP210X_GET_FW_VER 0x000E
416 #define CP210X_READ_2NCONFIG 0x000E
417 #define CP210X_GET_FW_VER_2N 0x0010
418 #define CP210X_READ_LATCH 0x00C2
419 #define CP210X_GET_PARTNUM 0x370B
420 #define CP210X_GET_PORTCONFIG 0x370C
421 #define CP210X_GET_DEVICEMODE 0x3711
422 #define CP210X_WRITE_LATCH 0x37E1
423
424 /* Part number definitions */
425 #define CP210X_PARTNUM_CP2101 0x01
426 #define CP210X_PARTNUM_CP2102 0x02
427 #define CP210X_PARTNUM_CP2103 0x03
428 #define CP210X_PARTNUM_CP2104 0x04
429 #define CP210X_PARTNUM_CP2105 0x05
430 #define CP210X_PARTNUM_CP2108 0x08
431 #define CP210X_PARTNUM_CP2102N_QFN28 0x20
432 #define CP210X_PARTNUM_CP2102N_QFN24 0x21
433 #define CP210X_PARTNUM_CP2102N_QFN20 0x22
434 #define CP210X_PARTNUM_UNKNOWN 0xFF
435
436 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
437 struct cp210x_comm_status {
438 __le32 ulErrors;
439 __le32 ulHoldReasons;
440 __le32 ulAmountInInQueue;
441 __le32 ulAmountInOutQueue;
442 u8 bEofReceived;
443 u8 bWaitForImmediate;
444 u8 bReserved;
445 } __packed;
446
447 /*
448 * CP210X_PURGE - 16 bits passed in wValue of USB request.
449 * SiLabs app note AN571 gives a strange description of the 4 bits:
450 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
451 * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
452 */
453 #define PURGE_ALL 0x000f
454
455 /* CP210X_EMBED_EVENTS */
456 #define CP210X_ESCCHAR 0xec
457
458 #define CP210X_LSR_OVERRUN BIT(1)
459 #define CP210X_LSR_PARITY BIT(2)
460 #define CP210X_LSR_FRAME BIT(3)
461 #define CP210X_LSR_BREAK BIT(4)
462
463
464 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
465 struct cp210x_flow_ctl {
466 __le32 ulControlHandshake;
467 __le32 ulFlowReplace;
468 __le32 ulXonLimit;
469 __le32 ulXoffLimit;
470 };
471
472 /* cp210x_flow_ctl::ulControlHandshake */
473 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0)
474 #define CP210X_SERIAL_DTR_INACTIVE (0 << 0)
475 #define CP210X_SERIAL_DTR_ACTIVE (1 << 0)
476 #define CP210X_SERIAL_DTR_FLOW_CTL (2 << 0)
477 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3)
478 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4)
479 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5)
480 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6)
481
482 /* cp210x_flow_ctl::ulFlowReplace */
483 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0)
484 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1)
485 #define CP210X_SERIAL_ERROR_CHAR BIT(2)
486 #define CP210X_SERIAL_NULL_STRIPPING BIT(3)
487 #define CP210X_SERIAL_BREAK_CHAR BIT(4)
488 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6)
489 #define CP210X_SERIAL_RTS_INACTIVE (0 << 6)
490 #define CP210X_SERIAL_RTS_ACTIVE (1 << 6)
491 #define CP210X_SERIAL_RTS_FLOW_CTL (2 << 6)
492 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31)
493
494 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
495 struct cp210x_pin_mode {
496 u8 eci;
497 u8 sci;
498 };
499
500 #define CP210X_PIN_MODE_MODEM 0
501 #define CP210X_PIN_MODE_GPIO BIT(0)
502
503 /*
504 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes
505 * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes.
506 */
507 struct cp210x_dual_port_config {
508 __le16 gpio_mode;
509 u8 __pad0[2];
510 __le16 reset_state;
511 u8 __pad1[4];
512 __le16 suspend_state;
513 u8 sci_cfg;
514 u8 eci_cfg;
515 u8 device_cfg;
516 } __packed;
517
518 /*
519 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes
520 * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes.
521 */
522 struct cp210x_single_port_config {
523 __le16 gpio_mode;
524 u8 __pad0[2];
525 __le16 reset_state;
526 u8 __pad1[4];
527 __le16 suspend_state;
528 u8 device_cfg;
529 } __packed;
530
531 /* GPIO modes */
532 #define CP210X_SCI_GPIO_MODE_OFFSET 9
533 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9)
534
535 #define CP210X_ECI_GPIO_MODE_OFFSET 2
536 #define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2)
537
538 #define CP210X_GPIO_MODE_OFFSET 8
539 #define CP210X_GPIO_MODE_MASK GENMASK(11, 8)
540
541 /* CP2105 port configuration values */
542 #define CP2105_GPIO0_TXLED_MODE BIT(0)
543 #define CP2105_GPIO1_RXLED_MODE BIT(1)
544 #define CP2105_GPIO1_RS485_MODE BIT(2)
545
546 /* CP2104 port configuration values */
547 #define CP2104_GPIO0_TXLED_MODE BIT(0)
548 #define CP2104_GPIO1_RXLED_MODE BIT(1)
549 #define CP2104_GPIO2_RS485_MODE BIT(2)
550
551 struct cp210x_quad_port_state {
552 __le16 gpio_mode_pb0;
553 __le16 gpio_mode_pb1;
554 __le16 gpio_mode_pb2;
555 __le16 gpio_mode_pb3;
556 __le16 gpio_mode_pb4;
557
558 __le16 gpio_lowpower_pb0;
559 __le16 gpio_lowpower_pb1;
560 __le16 gpio_lowpower_pb2;
561 __le16 gpio_lowpower_pb3;
562 __le16 gpio_lowpower_pb4;
563
564 __le16 gpio_latch_pb0;
565 __le16 gpio_latch_pb1;
566 __le16 gpio_latch_pb2;
567 __le16 gpio_latch_pb3;
568 __le16 gpio_latch_pb4;
569 };
570
571 /*
572 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0x49 bytes
573 * on a CP2108 chip.
574 *
575 * See https://www.silabs.com/documents/public/application-notes/an978-cp210x-usb-to-uart-api-specification.pdf
576 */
577 struct cp210x_quad_port_config {
578 struct cp210x_quad_port_state reset_state;
579 struct cp210x_quad_port_state suspend_state;
580 u8 ipdelay_ifc[4];
581 u8 enhancedfxn_ifc[4];
582 u8 enhancedfxn_device;
583 u8 extclkfreq[4];
584 } __packed;
585
586 #define CP2108_EF_IFC_GPIO_TXLED 0x01
587 #define CP2108_EF_IFC_GPIO_RXLED 0x02
588 #define CP2108_EF_IFC_GPIO_RS485 0x04
589 #define CP2108_EF_IFC_GPIO_RS485_LOGIC 0x08
590 #define CP2108_EF_IFC_GPIO_CLOCK 0x10
591 #define CP2108_EF_IFC_DYNAMIC_SUSPEND 0x40
592
593 /* CP2102N configuration array indices */
594 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX 2
595 #define CP210X_2NCONFIG_GPIO_MODE_IDX 581
596 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587
597 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600
598
599 /* CP2102N QFN20 port configuration values */
600 #define CP2102N_QFN20_GPIO2_TXLED_MODE BIT(2)
601 #define CP2102N_QFN20_GPIO3_RXLED_MODE BIT(3)
602 #define CP2102N_QFN20_GPIO1_RS485_MODE BIT(4)
603 #define CP2102N_QFN20_GPIO0_CLK_MODE BIT(6)
604
605 /*
606 * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x02 bytes
607 * for CP2102N, CP2103, CP2104 and CP2105.
608 */
609 struct cp210x_gpio_write {
610 u8 mask;
611 u8 state;
612 };
613
614 /*
615 * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x04 bytes
616 * for CP2108.
617 */
618 struct cp210x_gpio_write16 {
619 __le16 mask;
620 __le16 state;
621 };
622
623 /*
624 * Helper to get interface number when we only have struct usb_serial.
625 */
cp210x_interface_num(struct usb_serial * serial)626 static u8 cp210x_interface_num(struct usb_serial *serial)
627 {
628 struct usb_host_interface *cur_altsetting;
629
630 cur_altsetting = serial->interface->cur_altsetting;
631
632 return cur_altsetting->desc.bInterfaceNumber;
633 }
634
635 /*
636 * Reads a variable-sized block of CP210X_ registers, identified by req.
637 * Returns data into buf in native USB byte order.
638 */
cp210x_read_reg_block(struct usb_serial_port * port,u8 req,void * buf,int bufsize)639 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
640 void *buf, int bufsize)
641 {
642 struct usb_serial *serial = port->serial;
643 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
644 int result;
645
646
647 result = usb_control_msg_recv(serial->dev, 0, req,
648 REQTYPE_INTERFACE_TO_HOST, 0,
649 port_priv->bInterfaceNumber, buf, bufsize,
650 USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
651 if (result) {
652 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
653 req, bufsize, result);
654 return result;
655 }
656
657 return 0;
658 }
659
660 /*
661 * Reads any 8-bit CP210X_ register identified by req.
662 */
cp210x_read_u8_reg(struct usb_serial_port * port,u8 req,u8 * val)663 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
664 {
665 return cp210x_read_reg_block(port, req, val, sizeof(*val));
666 }
667
668 /*
669 * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
670 * Returns data into buf in native USB byte order.
671 */
cp210x_read_vendor_block(struct usb_serial * serial,u8 type,u16 val,void * buf,int bufsize)672 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
673 void *buf, int bufsize)
674 {
675 int result;
676
677 result = usb_control_msg_recv(serial->dev, 0, CP210X_VENDOR_SPECIFIC,
678 type, val, cp210x_interface_num(serial), buf, bufsize,
679 USB_CTRL_GET_TIMEOUT, GFP_KERNEL);
680 if (result) {
681 dev_err(&serial->interface->dev,
682 "failed to get vendor val 0x%04x size %d: %d\n", val,
683 bufsize, result);
684 return result;
685 }
686
687 return 0;
688 }
689
690 /*
691 * Writes any 16-bit CP210X_ register (req) whose value is passed
692 * entirely in the wValue field of the USB request.
693 */
cp210x_write_u16_reg(struct usb_serial_port * port,u8 req,u16 val)694 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
695 {
696 struct usb_serial *serial = port->serial;
697 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
698 int result;
699
700 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
701 req, REQTYPE_HOST_TO_INTERFACE, val,
702 port_priv->bInterfaceNumber, NULL, 0,
703 USB_CTRL_SET_TIMEOUT);
704 if (result < 0) {
705 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
706 req, result);
707 }
708
709 return result;
710 }
711
712 /*
713 * Writes a variable-sized block of CP210X_ registers, identified by req.
714 * Data in buf must be in native USB byte order.
715 */
cp210x_write_reg_block(struct usb_serial_port * port,u8 req,void * buf,int bufsize)716 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
717 void *buf, int bufsize)
718 {
719 struct usb_serial *serial = port->serial;
720 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
721 int result;
722
723 result = usb_control_msg_send(serial->dev, 0, req,
724 REQTYPE_HOST_TO_INTERFACE, 0,
725 port_priv->bInterfaceNumber, buf, bufsize,
726 USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
727 if (result) {
728 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
729 req, bufsize, result);
730 return result;
731 }
732
733 return 0;
734 }
735
736 /*
737 * Writes any 32-bit CP210X_ register identified by req.
738 */
cp210x_write_u32_reg(struct usb_serial_port * port,u8 req,u32 val)739 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
740 {
741 __le32 le32_val;
742
743 le32_val = cpu_to_le32(val);
744
745 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
746 }
747
748 #ifdef CONFIG_GPIOLIB
749 /*
750 * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
751 * Data in buf must be in native USB byte order.
752 */
cp210x_write_vendor_block(struct usb_serial * serial,u8 type,u16 val,void * buf,int bufsize)753 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
754 u16 val, void *buf, int bufsize)
755 {
756 int result;
757
758 result = usb_control_msg_send(serial->dev, 0, CP210X_VENDOR_SPECIFIC,
759 type, val, cp210x_interface_num(serial), buf, bufsize,
760 USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
761 if (result) {
762 dev_err(&serial->interface->dev,
763 "failed to set vendor val 0x%04x size %d: %d\n", val,
764 bufsize, result);
765 return result;
766 }
767
768 return 0;
769 }
770 #endif
771
cp210x_open(struct tty_struct * tty,struct usb_serial_port * port)772 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
773 {
774 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
775 int result;
776
777 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
778 if (result) {
779 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
780 return result;
781 }
782
783 if (tty)
784 cp210x_set_termios(tty, port, NULL);
785
786 result = usb_serial_generic_open(tty, port);
787 if (result)
788 goto err_disable;
789
790 return 0;
791
792 err_disable:
793 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
794 port_priv->event_mode = false;
795
796 return result;
797 }
798
cp210x_close(struct usb_serial_port * port)799 static void cp210x_close(struct usb_serial_port *port)
800 {
801 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
802
803 usb_serial_generic_close(port);
804
805 /* Clear both queues; cp2108 needs this to avoid an occasional hang */
806 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
807
808 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
809
810 /* Disabling the interface disables event-insertion mode. */
811 port_priv->event_mode = false;
812 }
813
cp210x_process_lsr(struct usb_serial_port * port,unsigned char lsr,char * flag)814 static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag)
815 {
816 if (lsr & CP210X_LSR_BREAK) {
817 port->icount.brk++;
818 *flag = TTY_BREAK;
819 } else if (lsr & CP210X_LSR_PARITY) {
820 port->icount.parity++;
821 *flag = TTY_PARITY;
822 } else if (lsr & CP210X_LSR_FRAME) {
823 port->icount.frame++;
824 *flag = TTY_FRAME;
825 }
826
827 if (lsr & CP210X_LSR_OVERRUN) {
828 port->icount.overrun++;
829 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
830 }
831 }
832
cp210x_process_char(struct usb_serial_port * port,unsigned char * ch,char * flag)833 static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag)
834 {
835 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
836
837 switch (port_priv->event_state) {
838 case ES_DATA:
839 if (*ch == CP210X_ESCCHAR) {
840 port_priv->event_state = ES_ESCAPE;
841 break;
842 }
843 return false;
844 case ES_ESCAPE:
845 switch (*ch) {
846 case 0:
847 dev_dbg(&port->dev, "%s - escape char\n", __func__);
848 *ch = CP210X_ESCCHAR;
849 port_priv->event_state = ES_DATA;
850 return false;
851 case 1:
852 port_priv->event_state = ES_LSR_DATA_0;
853 break;
854 case 2:
855 port_priv->event_state = ES_LSR;
856 break;
857 case 3:
858 port_priv->event_state = ES_MSR;
859 break;
860 default:
861 dev_err(&port->dev, "malformed event 0x%02x\n", *ch);
862 port_priv->event_state = ES_DATA;
863 break;
864 }
865 break;
866 case ES_LSR_DATA_0:
867 port_priv->lsr = *ch;
868 port_priv->event_state = ES_LSR_DATA_1;
869 break;
870 case ES_LSR_DATA_1:
871 dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n",
872 __func__, port_priv->lsr, *ch);
873 cp210x_process_lsr(port, port_priv->lsr, flag);
874 port_priv->event_state = ES_DATA;
875 return false;
876 case ES_LSR:
877 dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch);
878 port_priv->lsr = *ch;
879 cp210x_process_lsr(port, port_priv->lsr, flag);
880 port_priv->event_state = ES_DATA;
881 break;
882 case ES_MSR:
883 dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch);
884 /* unimplemented */
885 port_priv->event_state = ES_DATA;
886 break;
887 }
888
889 return true;
890 }
891
cp210x_process_read_urb(struct urb * urb)892 static void cp210x_process_read_urb(struct urb *urb)
893 {
894 struct usb_serial_port *port = urb->context;
895 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
896 unsigned char *ch = urb->transfer_buffer;
897 char flag;
898 int i;
899
900 if (!urb->actual_length)
901 return;
902
903 if (port_priv->event_mode) {
904 for (i = 0; i < urb->actual_length; i++, ch++) {
905 flag = TTY_NORMAL;
906
907 if (cp210x_process_char(port, ch, &flag))
908 continue;
909
910 tty_insert_flip_char(&port->port, *ch, flag);
911 }
912 } else {
913 tty_insert_flip_string(&port->port, ch, urb->actual_length);
914 }
915 tty_flip_buffer_push(&port->port);
916 }
917
918 /*
919 * Read how many bytes are waiting in the TX queue.
920 */
cp210x_get_tx_queue_byte_count(struct usb_serial_port * port,u32 * count)921 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
922 u32 *count)
923 {
924 struct usb_serial *serial = port->serial;
925 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
926 struct cp210x_comm_status sts;
927 int result;
928
929 result = usb_control_msg_recv(serial->dev, 0, CP210X_GET_COMM_STATUS,
930 REQTYPE_INTERFACE_TO_HOST, 0,
931 port_priv->bInterfaceNumber, &sts, sizeof(sts),
932 USB_CTRL_GET_TIMEOUT, GFP_KERNEL);
933 if (result) {
934 dev_err(&port->dev, "failed to get comm status: %d\n", result);
935 return result;
936 }
937
938 *count = le32_to_cpu(sts.ulAmountInOutQueue);
939
940 return 0;
941 }
942
cp210x_tx_empty(struct usb_serial_port * port)943 static bool cp210x_tx_empty(struct usb_serial_port *port)
944 {
945 int err;
946 u32 count;
947
948 err = cp210x_get_tx_queue_byte_count(port, &count);
949 if (err)
950 return true;
951
952 return !count;
953 }
954
955 struct cp210x_rate {
956 speed_t rate;
957 speed_t high;
958 };
959
960 static const struct cp210x_rate cp210x_an205_table1[] = {
961 { 300, 300 },
962 { 600, 600 },
963 { 1200, 1200 },
964 { 1800, 1800 },
965 { 2400, 2400 },
966 { 4000, 4000 },
967 { 4800, 4803 },
968 { 7200, 7207 },
969 { 9600, 9612 },
970 { 14400, 14428 },
971 { 16000, 16062 },
972 { 19200, 19250 },
973 { 28800, 28912 },
974 { 38400, 38601 },
975 { 51200, 51558 },
976 { 56000, 56280 },
977 { 57600, 58053 },
978 { 64000, 64111 },
979 { 76800, 77608 },
980 { 115200, 117028 },
981 { 128000, 129347 },
982 { 153600, 156868 },
983 { 230400, 237832 },
984 { 250000, 254234 },
985 { 256000, 273066 },
986 { 460800, 491520 },
987 { 500000, 567138 },
988 { 576000, 670254 },
989 { 921600, UINT_MAX }
990 };
991
992 /*
993 * Quantises the baud rate as per AN205 Table 1
994 */
cp210x_get_an205_rate(speed_t baud)995 static speed_t cp210x_get_an205_rate(speed_t baud)
996 {
997 int i;
998
999 for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) {
1000 if (baud <= cp210x_an205_table1[i].high)
1001 break;
1002 }
1003
1004 return cp210x_an205_table1[i].rate;
1005 }
1006
cp210x_get_actual_rate(speed_t baud)1007 static speed_t cp210x_get_actual_rate(speed_t baud)
1008 {
1009 unsigned int prescale = 1;
1010 unsigned int div;
1011
1012 if (baud <= 365)
1013 prescale = 4;
1014
1015 div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud);
1016 baud = 48000000 / (2 * prescale * div);
1017
1018 return baud;
1019 }
1020
1021 /*
1022 * CP2101 supports the following baud rates:
1023 *
1024 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
1025 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
1026 *
1027 * CP2102 and CP2103 support the following additional rates:
1028 *
1029 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
1030 * 576000
1031 *
1032 * The device will map a requested rate to a supported one, but the result
1033 * of requests for rates greater than 1053257 is undefined (see AN205).
1034 *
1035 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
1036 * respectively, with an error less than 1%. The actual rates are determined
1037 * by
1038 *
1039 * div = round(freq / (2 x prescale x request))
1040 * actual = freq / (2 x prescale x div)
1041 *
1042 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1043 * or 1 otherwise.
1044 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1045 * otherwise.
1046 */
cp210x_change_speed(struct tty_struct * tty,struct usb_serial_port * port,const struct ktermios * old_termios)1047 static void cp210x_change_speed(struct tty_struct *tty,
1048 struct usb_serial_port *port,
1049 const struct ktermios *old_termios)
1050 {
1051 struct usb_serial *serial = port->serial;
1052 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1053 u32 baud;
1054
1055 /*
1056 * This maps the requested rate to the actual rate, a valid rate on
1057 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed].
1058 *
1059 * NOTE: B0 is not implemented.
1060 */
1061 baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed);
1062
1063 if (priv->use_actual_rate)
1064 baud = cp210x_get_actual_rate(baud);
1065 else if (baud < 1000000)
1066 baud = cp210x_get_an205_rate(baud);
1067
1068 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1069 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1070 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1071 if (old_termios)
1072 baud = old_termios->c_ospeed;
1073 else
1074 baud = 9600;
1075 }
1076
1077 tty_encode_baud_rate(tty, baud, baud);
1078 }
1079
cp210x_enable_event_mode(struct usb_serial_port * port)1080 static void cp210x_enable_event_mode(struct usb_serial_port *port)
1081 {
1082 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1083 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1084 int ret;
1085
1086 if (port_priv->event_mode)
1087 return;
1088
1089 if (priv->no_event_mode)
1090 return;
1091
1092 port_priv->event_state = ES_DATA;
1093 port_priv->event_mode = true;
1094
1095 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR);
1096 if (ret) {
1097 dev_err(&port->dev, "failed to enable events: %d\n", ret);
1098 port_priv->event_mode = false;
1099 }
1100 }
1101
cp210x_disable_event_mode(struct usb_serial_port * port)1102 static void cp210x_disable_event_mode(struct usb_serial_port *port)
1103 {
1104 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1105 int ret;
1106
1107 if (!port_priv->event_mode)
1108 return;
1109
1110 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0);
1111 if (ret) {
1112 dev_err(&port->dev, "failed to disable events: %d\n", ret);
1113 return;
1114 }
1115
1116 port_priv->event_mode = false;
1117 }
1118
cp210x_termios_change(const struct ktermios * a,const struct ktermios * b)1119 static bool cp210x_termios_change(const struct ktermios *a, const struct ktermios *b)
1120 {
1121 bool iflag_change, cc_change;
1122
1123 iflag_change = ((a->c_iflag ^ b->c_iflag) & (INPCK | IXON | IXOFF));
1124 cc_change = a->c_cc[VSTART] != b->c_cc[VSTART] ||
1125 a->c_cc[VSTOP] != b->c_cc[VSTOP];
1126
1127 return tty_termios_hw_change(a, b) || iflag_change || cc_change;
1128 }
1129
cp210x_set_flow_control(struct tty_struct * tty,struct usb_serial_port * port,const struct ktermios * old_termios)1130 static void cp210x_set_flow_control(struct tty_struct *tty,
1131 struct usb_serial_port *port,
1132 const struct ktermios *old_termios)
1133 {
1134 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1135 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1136 struct cp210x_special_chars chars;
1137 struct cp210x_flow_ctl flow_ctl;
1138 u32 flow_repl;
1139 u32 ctl_hs;
1140 bool crtscts;
1141 int ret;
1142
1143 /*
1144 * Some CP2102N interpret ulXonLimit as ulFlowReplace (erratum
1145 * CP2102N_E104). Report back that flow control is not supported.
1146 */
1147 if (priv->no_flow_control) {
1148 tty->termios.c_cflag &= ~CRTSCTS;
1149 tty->termios.c_iflag &= ~(IXON | IXOFF);
1150 }
1151
1152 if (old_termios &&
1153 C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS) &&
1154 I_IXON(tty) == (old_termios->c_iflag & IXON) &&
1155 I_IXOFF(tty) == (old_termios->c_iflag & IXOFF) &&
1156 START_CHAR(tty) == old_termios->c_cc[VSTART] &&
1157 STOP_CHAR(tty) == old_termios->c_cc[VSTOP]) {
1158 return;
1159 }
1160
1161 if (I_IXON(tty) || I_IXOFF(tty)) {
1162 memset(&chars, 0, sizeof(chars));
1163
1164 chars.bXonChar = START_CHAR(tty);
1165 chars.bXoffChar = STOP_CHAR(tty);
1166
1167 ret = cp210x_write_reg_block(port, CP210X_SET_CHARS, &chars,
1168 sizeof(chars));
1169 if (ret) {
1170 dev_err(&port->dev, "failed to set special chars: %d\n",
1171 ret);
1172 }
1173 }
1174
1175 mutex_lock(&port_priv->mutex);
1176
1177 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1178 sizeof(flow_ctl));
1179 if (ret)
1180 goto out_unlock;
1181
1182 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1183 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1184
1185 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1186 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1187 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1188 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1189 if (port_priv->dtr)
1190 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE;
1191 else
1192 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE;
1193
1194 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1195 if (C_CRTSCTS(tty)) {
1196 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1197 if (port_priv->rts)
1198 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL;
1199 else
1200 flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1201 crtscts = true;
1202 } else {
1203 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1204 if (port_priv->rts)
1205 flow_repl |= CP210X_SERIAL_RTS_ACTIVE;
1206 else
1207 flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1208 crtscts = false;
1209 }
1210
1211 if (I_IXOFF(tty)) {
1212 flow_repl |= CP210X_SERIAL_AUTO_RECEIVE;
1213
1214 flow_ctl.ulXonLimit = cpu_to_le32(128);
1215 flow_ctl.ulXoffLimit = cpu_to_le32(128);
1216 } else {
1217 flow_repl &= ~CP210X_SERIAL_AUTO_RECEIVE;
1218 }
1219
1220 if (I_IXON(tty))
1221 flow_repl |= CP210X_SERIAL_AUTO_TRANSMIT;
1222 else
1223 flow_repl &= ~CP210X_SERIAL_AUTO_TRANSMIT;
1224
1225 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", __func__,
1226 ctl_hs, flow_repl);
1227
1228 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1229 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1230
1231 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1232 sizeof(flow_ctl));
1233 if (ret)
1234 goto out_unlock;
1235
1236 port_priv->crtscts = crtscts;
1237 out_unlock:
1238 mutex_unlock(&port_priv->mutex);
1239 }
1240
cp210x_set_termios(struct tty_struct * tty,struct usb_serial_port * port,const struct ktermios * old_termios)1241 static void cp210x_set_termios(struct tty_struct *tty,
1242 struct usb_serial_port *port,
1243 const struct ktermios *old_termios)
1244 {
1245 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1246 u16 bits;
1247 int ret;
1248
1249 if (old_termios && !cp210x_termios_change(&tty->termios, old_termios))
1250 return;
1251
1252 if (!old_termios || tty->termios.c_ospeed != old_termios->c_ospeed)
1253 cp210x_change_speed(tty, port, old_termios);
1254
1255 /* CP2101 only supports CS8, 1 stop bit and non-stick parity. */
1256 if (priv->partnum == CP210X_PARTNUM_CP2101) {
1257 tty->termios.c_cflag &= ~(CSIZE | CSTOPB | CMSPAR);
1258 tty->termios.c_cflag |= CS8;
1259 }
1260
1261 bits = 0;
1262
1263 switch (C_CSIZE(tty)) {
1264 case CS5:
1265 bits |= BITS_DATA_5;
1266 break;
1267 case CS6:
1268 bits |= BITS_DATA_6;
1269 break;
1270 case CS7:
1271 bits |= BITS_DATA_7;
1272 break;
1273 case CS8:
1274 default:
1275 bits |= BITS_DATA_8;
1276 break;
1277 }
1278
1279 if (C_PARENB(tty)) {
1280 if (C_CMSPAR(tty)) {
1281 if (C_PARODD(tty))
1282 bits |= BITS_PARITY_MARK;
1283 else
1284 bits |= BITS_PARITY_SPACE;
1285 } else {
1286 if (C_PARODD(tty))
1287 bits |= BITS_PARITY_ODD;
1288 else
1289 bits |= BITS_PARITY_EVEN;
1290 }
1291 }
1292
1293 if (C_CSTOPB(tty))
1294 bits |= BITS_STOP_2;
1295 else
1296 bits |= BITS_STOP_1;
1297
1298 ret = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1299 if (ret)
1300 dev_err(&port->dev, "failed to set line control: %d\n", ret);
1301
1302 cp210x_set_flow_control(tty, port, old_termios);
1303
1304 /*
1305 * Enable event-insertion mode only if input parity checking is
1306 * enabled for now.
1307 */
1308 if (I_INPCK(tty))
1309 cp210x_enable_event_mode(port);
1310 else
1311 cp210x_disable_event_mode(port);
1312 }
1313
cp210x_tiocmset(struct tty_struct * tty,unsigned int set,unsigned int clear)1314 static int cp210x_tiocmset(struct tty_struct *tty,
1315 unsigned int set, unsigned int clear)
1316 {
1317 struct usb_serial_port *port = tty->driver_data;
1318 return cp210x_tiocmset_port(port, set, clear);
1319 }
1320
cp210x_tiocmset_port(struct usb_serial_port * port,unsigned int set,unsigned int clear)1321 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1322 unsigned int set, unsigned int clear)
1323 {
1324 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1325 struct cp210x_flow_ctl flow_ctl;
1326 u32 ctl_hs, flow_repl;
1327 u16 control = 0;
1328 int ret;
1329
1330 mutex_lock(&port_priv->mutex);
1331
1332 if (set & TIOCM_RTS) {
1333 port_priv->rts = true;
1334 control |= CONTROL_RTS;
1335 control |= CONTROL_WRITE_RTS;
1336 }
1337 if (set & TIOCM_DTR) {
1338 port_priv->dtr = true;
1339 control |= CONTROL_DTR;
1340 control |= CONTROL_WRITE_DTR;
1341 }
1342 if (clear & TIOCM_RTS) {
1343 port_priv->rts = false;
1344 control &= ~CONTROL_RTS;
1345 control |= CONTROL_WRITE_RTS;
1346 }
1347 if (clear & TIOCM_DTR) {
1348 port_priv->dtr = false;
1349 control &= ~CONTROL_DTR;
1350 control |= CONTROL_WRITE_DTR;
1351 }
1352
1353 /*
1354 * Use SET_FLOW to set DTR and enable/disable auto-RTS when hardware
1355 * flow control is enabled.
1356 */
1357 if (port_priv->crtscts && control & CONTROL_WRITE_RTS) {
1358 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1359 sizeof(flow_ctl));
1360 if (ret)
1361 goto out_unlock;
1362
1363 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1364 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1365
1366 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1367 if (port_priv->dtr)
1368 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE;
1369 else
1370 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE;
1371
1372 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1373 if (port_priv->rts)
1374 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL;
1375 else
1376 flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1377
1378 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1379 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1380
1381 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n",
1382 __func__, ctl_hs, flow_repl);
1383
1384 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1385 sizeof(flow_ctl));
1386 } else {
1387 dev_dbg(&port->dev, "%s - control = 0x%04x\n", __func__, control);
1388
1389 ret = cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1390 }
1391 out_unlock:
1392 mutex_unlock(&port_priv->mutex);
1393
1394 return ret;
1395 }
1396
cp210x_dtr_rts(struct usb_serial_port * port,int on)1397 static void cp210x_dtr_rts(struct usb_serial_port *port, int on)
1398 {
1399 if (on)
1400 cp210x_tiocmset_port(port, TIOCM_DTR | TIOCM_RTS, 0);
1401 else
1402 cp210x_tiocmset_port(port, 0, TIOCM_DTR | TIOCM_RTS);
1403 }
1404
cp210x_tiocmget(struct tty_struct * tty)1405 static int cp210x_tiocmget(struct tty_struct *tty)
1406 {
1407 struct usb_serial_port *port = tty->driver_data;
1408 u8 control;
1409 int result;
1410
1411 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1412 if (result)
1413 return result;
1414
1415 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1416 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1417 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1418 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1419 |((control & CONTROL_RING)? TIOCM_RI : 0)
1420 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
1421
1422 dev_dbg(&port->dev, "%s - control = 0x%02x\n", __func__, control);
1423
1424 return result;
1425 }
1426
cp210x_break_ctl(struct tty_struct * tty,int break_state)1427 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1428 {
1429 struct usb_serial_port *port = tty->driver_data;
1430 u16 state;
1431
1432 if (break_state == 0)
1433 state = BREAK_OFF;
1434 else
1435 state = BREAK_ON;
1436 dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1437 state == BREAK_OFF ? "off" : "on");
1438 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1439 }
1440
1441 #ifdef CONFIG_GPIOLIB
cp210x_gpio_get(struct gpio_chip * gc,unsigned int gpio)1442 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1443 {
1444 struct usb_serial *serial = gpiochip_get_data(gc);
1445 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1446 u8 req_type;
1447 u16 mask;
1448 int result;
1449 int len;
1450
1451 result = usb_autopm_get_interface(serial->interface);
1452 if (result)
1453 return result;
1454
1455 switch (priv->partnum) {
1456 case CP210X_PARTNUM_CP2105:
1457 req_type = REQTYPE_INTERFACE_TO_HOST;
1458 len = 1;
1459 break;
1460 case CP210X_PARTNUM_CP2108:
1461 req_type = REQTYPE_INTERFACE_TO_HOST;
1462 len = 2;
1463 break;
1464 default:
1465 req_type = REQTYPE_DEVICE_TO_HOST;
1466 len = 1;
1467 break;
1468 }
1469
1470 mask = 0;
1471 result = cp210x_read_vendor_block(serial, req_type, CP210X_READ_LATCH,
1472 &mask, len);
1473
1474 usb_autopm_put_interface(serial->interface);
1475
1476 if (result < 0)
1477 return result;
1478
1479 le16_to_cpus(&mask);
1480
1481 return !!(mask & BIT(gpio));
1482 }
1483
cp210x_gpio_set(struct gpio_chip * gc,unsigned int gpio,int value)1484 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1485 {
1486 struct usb_serial *serial = gpiochip_get_data(gc);
1487 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1488 struct cp210x_gpio_write16 buf16;
1489 struct cp210x_gpio_write buf;
1490 u16 mask, state;
1491 u16 wIndex;
1492 int result;
1493
1494 if (value == 1)
1495 state = BIT(gpio);
1496 else
1497 state = 0;
1498
1499 mask = BIT(gpio);
1500
1501 result = usb_autopm_get_interface(serial->interface);
1502 if (result)
1503 goto out;
1504
1505 switch (priv->partnum) {
1506 case CP210X_PARTNUM_CP2105:
1507 buf.mask = (u8)mask;
1508 buf.state = (u8)state;
1509 result = cp210x_write_vendor_block(serial,
1510 REQTYPE_HOST_TO_INTERFACE,
1511 CP210X_WRITE_LATCH, &buf,
1512 sizeof(buf));
1513 break;
1514 case CP210X_PARTNUM_CP2108:
1515 buf16.mask = cpu_to_le16(mask);
1516 buf16.state = cpu_to_le16(state);
1517 result = cp210x_write_vendor_block(serial,
1518 REQTYPE_HOST_TO_INTERFACE,
1519 CP210X_WRITE_LATCH, &buf16,
1520 sizeof(buf16));
1521 break;
1522 default:
1523 wIndex = state << 8 | mask;
1524 result = usb_control_msg(serial->dev,
1525 usb_sndctrlpipe(serial->dev, 0),
1526 CP210X_VENDOR_SPECIFIC,
1527 REQTYPE_HOST_TO_DEVICE,
1528 CP210X_WRITE_LATCH,
1529 wIndex,
1530 NULL, 0, USB_CTRL_SET_TIMEOUT);
1531 break;
1532 }
1533
1534 usb_autopm_put_interface(serial->interface);
1535 out:
1536 if (result < 0) {
1537 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n",
1538 result);
1539 }
1540 }
1541
cp210x_gpio_direction_get(struct gpio_chip * gc,unsigned int gpio)1542 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1543 {
1544 struct usb_serial *serial = gpiochip_get_data(gc);
1545 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1546
1547 return priv->gpio_input & BIT(gpio);
1548 }
1549
cp210x_gpio_direction_input(struct gpio_chip * gc,unsigned int gpio)1550 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
1551 {
1552 struct usb_serial *serial = gpiochip_get_data(gc);
1553 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1554
1555 if (priv->partnum == CP210X_PARTNUM_CP2105) {
1556 /* hardware does not support an input mode */
1557 return -ENOTSUPP;
1558 }
1559
1560 /* push-pull pins cannot be changed to be inputs */
1561 if (priv->gpio_pushpull & BIT(gpio))
1562 return -EINVAL;
1563
1564 /* make sure to release pin if it is being driven low */
1565 cp210x_gpio_set(gc, gpio, 1);
1566
1567 priv->gpio_input |= BIT(gpio);
1568
1569 return 0;
1570 }
1571
cp210x_gpio_direction_output(struct gpio_chip * gc,unsigned int gpio,int value)1572 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1573 int value)
1574 {
1575 struct usb_serial *serial = gpiochip_get_data(gc);
1576 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1577
1578 priv->gpio_input &= ~BIT(gpio);
1579 cp210x_gpio_set(gc, gpio, value);
1580
1581 return 0;
1582 }
1583
cp210x_gpio_set_config(struct gpio_chip * gc,unsigned int gpio,unsigned long config)1584 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
1585 unsigned long config)
1586 {
1587 struct usb_serial *serial = gpiochip_get_data(gc);
1588 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1589 enum pin_config_param param = pinconf_to_config_param(config);
1590
1591 /* Succeed only if in correct mode (this can't be set at runtime) */
1592 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) &&
1593 (priv->gpio_pushpull & BIT(gpio)))
1594 return 0;
1595
1596 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) &&
1597 !(priv->gpio_pushpull & BIT(gpio)))
1598 return 0;
1599
1600 return -ENOTSUPP;
1601 }
1602
cp210x_gpio_init_valid_mask(struct gpio_chip * gc,unsigned long * valid_mask,unsigned int ngpios)1603 static int cp210x_gpio_init_valid_mask(struct gpio_chip *gc,
1604 unsigned long *valid_mask, unsigned int ngpios)
1605 {
1606 struct usb_serial *serial = gpiochip_get_data(gc);
1607 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1608 struct device *dev = &serial->interface->dev;
1609 unsigned long altfunc_mask = priv->gpio_altfunc;
1610
1611 bitmap_complement(valid_mask, &altfunc_mask, ngpios);
1612
1613 if (bitmap_empty(valid_mask, ngpios))
1614 dev_dbg(dev, "no pin configured for GPIO\n");
1615 else
1616 dev_dbg(dev, "GPIO.%*pbl configured for GPIO\n", ngpios,
1617 valid_mask);
1618 return 0;
1619 }
1620
1621 /*
1622 * This function is for configuring GPIO using shared pins, where other signals
1623 * are made unavailable by configuring the use of GPIO. This is believed to be
1624 * only applicable to the cp2105 at this point, the other devices supported by
1625 * this driver that provide GPIO do so in a way that does not impact other
1626 * signals and are thus expected to have very different initialisation.
1627 */
cp2105_gpioconf_init(struct usb_serial * serial)1628 static int cp2105_gpioconf_init(struct usb_serial *serial)
1629 {
1630 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1631 struct cp210x_pin_mode mode;
1632 struct cp210x_dual_port_config config;
1633 u8 intf_num = cp210x_interface_num(serial);
1634 u8 iface_config;
1635 int result;
1636
1637 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1638 CP210X_GET_DEVICEMODE, &mode,
1639 sizeof(mode));
1640 if (result < 0)
1641 return result;
1642
1643 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1644 CP210X_GET_PORTCONFIG, &config,
1645 sizeof(config));
1646 if (result < 0)
1647 return result;
1648
1649 /* 2 banks of GPIO - One for the pins taken from each serial port */
1650 if (intf_num == 0) {
1651 priv->gc.ngpio = 2;
1652
1653 if (mode.eci == CP210X_PIN_MODE_MODEM) {
1654 /* mark all GPIOs of this interface as reserved */
1655 priv->gpio_altfunc = 0xff;
1656 return 0;
1657 }
1658
1659 iface_config = config.eci_cfg;
1660 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1661 CP210X_ECI_GPIO_MODE_MASK) >>
1662 CP210X_ECI_GPIO_MODE_OFFSET);
1663 } else if (intf_num == 1) {
1664 priv->gc.ngpio = 3;
1665
1666 if (mode.sci == CP210X_PIN_MODE_MODEM) {
1667 /* mark all GPIOs of this interface as reserved */
1668 priv->gpio_altfunc = 0xff;
1669 return 0;
1670 }
1671
1672 iface_config = config.sci_cfg;
1673 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1674 CP210X_SCI_GPIO_MODE_MASK) >>
1675 CP210X_SCI_GPIO_MODE_OFFSET);
1676 } else {
1677 return -ENODEV;
1678 }
1679
1680 /* mark all pins which are not in GPIO mode */
1681 if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */
1682 priv->gpio_altfunc |= BIT(0);
1683 if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */
1684 CP2105_GPIO1_RS485_MODE))
1685 priv->gpio_altfunc |= BIT(1);
1686
1687 /* driver implementation for CP2105 only supports outputs */
1688 priv->gpio_input = 0;
1689
1690 return 0;
1691 }
1692
cp2104_gpioconf_init(struct usb_serial * serial)1693 static int cp2104_gpioconf_init(struct usb_serial *serial)
1694 {
1695 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1696 struct cp210x_single_port_config config;
1697 u8 iface_config;
1698 u8 gpio_latch;
1699 int result;
1700 u8 i;
1701
1702 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1703 CP210X_GET_PORTCONFIG, &config,
1704 sizeof(config));
1705 if (result < 0)
1706 return result;
1707
1708 priv->gc.ngpio = 4;
1709
1710 iface_config = config.device_cfg;
1711 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1712 CP210X_GPIO_MODE_MASK) >>
1713 CP210X_GPIO_MODE_OFFSET);
1714 gpio_latch = (u8)((le16_to_cpu(config.reset_state) &
1715 CP210X_GPIO_MODE_MASK) >>
1716 CP210X_GPIO_MODE_OFFSET);
1717
1718 /* mark all pins which are not in GPIO mode */
1719 if (iface_config & CP2104_GPIO0_TXLED_MODE) /* GPIO 0 */
1720 priv->gpio_altfunc |= BIT(0);
1721 if (iface_config & CP2104_GPIO1_RXLED_MODE) /* GPIO 1 */
1722 priv->gpio_altfunc |= BIT(1);
1723 if (iface_config & CP2104_GPIO2_RS485_MODE) /* GPIO 2 */
1724 priv->gpio_altfunc |= BIT(2);
1725
1726 /*
1727 * Like CP2102N, CP2104 has also no strict input and output pin
1728 * modes.
1729 * Do the same input mode emulation as CP2102N.
1730 */
1731 for (i = 0; i < priv->gc.ngpio; ++i) {
1732 /*
1733 * Set direction to "input" iff pin is open-drain and reset
1734 * value is 1.
1735 */
1736 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1737 priv->gpio_input |= BIT(i);
1738 }
1739
1740 return 0;
1741 }
1742
cp2108_gpio_init(struct usb_serial * serial)1743 static int cp2108_gpio_init(struct usb_serial *serial)
1744 {
1745 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1746 struct cp210x_quad_port_config config;
1747 u16 gpio_latch;
1748 int result;
1749 u8 i;
1750
1751 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1752 CP210X_GET_PORTCONFIG, &config,
1753 sizeof(config));
1754 if (result < 0)
1755 return result;
1756
1757 priv->gc.ngpio = 16;
1758 priv->gpio_pushpull = le16_to_cpu(config.reset_state.gpio_mode_pb1);
1759 gpio_latch = le16_to_cpu(config.reset_state.gpio_latch_pb1);
1760
1761 /*
1762 * Mark all pins which are not in GPIO mode.
1763 *
1764 * Refer to table 9.1 "GPIO Mode alternate Functions" in the datasheet:
1765 * https://www.silabs.com/documents/public/data-sheets/cp2108-datasheet.pdf
1766 *
1767 * Alternate functions of GPIO0 to GPIO3 are determine by enhancedfxn_ifc[0]
1768 * and the similarly for the other pins; enhancedfxn_ifc[1]: GPIO4 to GPIO7,
1769 * enhancedfxn_ifc[2]: GPIO8 to GPIO11, enhancedfxn_ifc[3]: GPIO12 to GPIO15.
1770 */
1771 for (i = 0; i < 4; i++) {
1772 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_TXLED)
1773 priv->gpio_altfunc |= BIT(i * 4);
1774 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RXLED)
1775 priv->gpio_altfunc |= BIT((i * 4) + 1);
1776 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RS485)
1777 priv->gpio_altfunc |= BIT((i * 4) + 2);
1778 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_CLOCK)
1779 priv->gpio_altfunc |= BIT((i * 4) + 3);
1780 }
1781
1782 /*
1783 * Like CP2102N, CP2108 has also no strict input and output pin
1784 * modes. Do the same input mode emulation as CP2102N.
1785 */
1786 for (i = 0; i < priv->gc.ngpio; ++i) {
1787 /*
1788 * Set direction to "input" iff pin is open-drain and reset
1789 * value is 1.
1790 */
1791 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1792 priv->gpio_input |= BIT(i);
1793 }
1794
1795 return 0;
1796 }
1797
cp2102n_gpioconf_init(struct usb_serial * serial)1798 static int cp2102n_gpioconf_init(struct usb_serial *serial)
1799 {
1800 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1801 const u16 config_size = 0x02a6;
1802 u8 gpio_rst_latch;
1803 u8 config_version;
1804 u8 gpio_pushpull;
1805 u8 *config_buf;
1806 u8 gpio_latch;
1807 u8 gpio_ctrl;
1808 int result;
1809 u8 i;
1810
1811 /*
1812 * Retrieve device configuration from the device.
1813 * The array received contains all customization settings done at the
1814 * factory/manufacturer. Format of the array is documented at the
1815 * time of writing at:
1816 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa
1817 */
1818 config_buf = kmalloc(config_size, GFP_KERNEL);
1819 if (!config_buf)
1820 return -ENOMEM;
1821
1822 result = cp210x_read_vendor_block(serial,
1823 REQTYPE_DEVICE_TO_HOST,
1824 CP210X_READ_2NCONFIG,
1825 config_buf,
1826 config_size);
1827 if (result < 0) {
1828 kfree(config_buf);
1829 return result;
1830 }
1831
1832 config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX];
1833 gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX];
1834 gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX];
1835 gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX];
1836
1837 kfree(config_buf);
1838
1839 /* Make sure this is a config format we understand. */
1840 if (config_version != 0x01)
1841 return -ENOTSUPP;
1842
1843 priv->gc.ngpio = 4;
1844
1845 /*
1846 * Get default pin states after reset. Needed so we can determine
1847 * the direction of an open-drain pin.
1848 */
1849 gpio_latch = (gpio_rst_latch >> 3) & 0x0f;
1850
1851 /* 0 indicates open-drain mode, 1 is push-pull */
1852 priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f;
1853
1854 /* 0 indicates GPIO mode, 1 is alternate function */
1855 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN20) {
1856 /* QFN20 is special... */
1857 if (gpio_ctrl & CP2102N_QFN20_GPIO0_CLK_MODE) /* GPIO 0 */
1858 priv->gpio_altfunc |= BIT(0);
1859 if (gpio_ctrl & CP2102N_QFN20_GPIO1_RS485_MODE) /* GPIO 1 */
1860 priv->gpio_altfunc |= BIT(1);
1861 if (gpio_ctrl & CP2102N_QFN20_GPIO2_TXLED_MODE) /* GPIO 2 */
1862 priv->gpio_altfunc |= BIT(2);
1863 if (gpio_ctrl & CP2102N_QFN20_GPIO3_RXLED_MODE) /* GPIO 3 */
1864 priv->gpio_altfunc |= BIT(3);
1865 } else {
1866 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f;
1867 }
1868
1869 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) {
1870 /*
1871 * For the QFN28 package, GPIO4-6 are controlled by
1872 * the low three bits of the mode/latch fields.
1873 * Contrary to the document linked above, the bits for
1874 * the SUSPEND pins are elsewhere. No alternate
1875 * function is available for these pins.
1876 */
1877 priv->gc.ngpio = 7;
1878 gpio_latch |= (gpio_rst_latch & 7) << 4;
1879 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4;
1880 }
1881
1882 /*
1883 * The CP2102N does not strictly has input and output pin modes,
1884 * it only knows open-drain and push-pull modes which is set at
1885 * factory. An open-drain pin can function both as an
1886 * input or an output. We emulate input mode for open-drain pins
1887 * by making sure they are not driven low, and we do not allow
1888 * push-pull pins to be set as an input.
1889 */
1890 for (i = 0; i < priv->gc.ngpio; ++i) {
1891 /*
1892 * Set direction to "input" iff pin is open-drain and reset
1893 * value is 1.
1894 */
1895 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1896 priv->gpio_input |= BIT(i);
1897 }
1898
1899 return 0;
1900 }
1901
cp210x_gpio_init(struct usb_serial * serial)1902 static int cp210x_gpio_init(struct usb_serial *serial)
1903 {
1904 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1905 int result;
1906
1907 switch (priv->partnum) {
1908 case CP210X_PARTNUM_CP2104:
1909 result = cp2104_gpioconf_init(serial);
1910 break;
1911 case CP210X_PARTNUM_CP2105:
1912 result = cp2105_gpioconf_init(serial);
1913 break;
1914 case CP210X_PARTNUM_CP2108:
1915 /*
1916 * The GPIOs are not tied to any specific port so only register
1917 * once for interface 0.
1918 */
1919 if (cp210x_interface_num(serial) != 0)
1920 return 0;
1921 result = cp2108_gpio_init(serial);
1922 break;
1923 case CP210X_PARTNUM_CP2102N_QFN28:
1924 case CP210X_PARTNUM_CP2102N_QFN24:
1925 case CP210X_PARTNUM_CP2102N_QFN20:
1926 result = cp2102n_gpioconf_init(serial);
1927 break;
1928 default:
1929 return 0;
1930 }
1931
1932 if (result < 0)
1933 return result;
1934
1935 priv->gc.label = "cp210x";
1936 priv->gc.get_direction = cp210x_gpio_direction_get;
1937 priv->gc.direction_input = cp210x_gpio_direction_input;
1938 priv->gc.direction_output = cp210x_gpio_direction_output;
1939 priv->gc.get = cp210x_gpio_get;
1940 priv->gc.set = cp210x_gpio_set;
1941 priv->gc.set_config = cp210x_gpio_set_config;
1942 priv->gc.init_valid_mask = cp210x_gpio_init_valid_mask;
1943 priv->gc.owner = THIS_MODULE;
1944 priv->gc.parent = &serial->interface->dev;
1945 priv->gc.base = -1;
1946 priv->gc.can_sleep = true;
1947
1948 result = gpiochip_add_data(&priv->gc, serial);
1949 if (!result)
1950 priv->gpio_registered = true;
1951
1952 return result;
1953 }
1954
cp210x_gpio_remove(struct usb_serial * serial)1955 static void cp210x_gpio_remove(struct usb_serial *serial)
1956 {
1957 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1958
1959 if (priv->gpio_registered) {
1960 gpiochip_remove(&priv->gc);
1961 priv->gpio_registered = false;
1962 }
1963 }
1964
1965 #else
1966
cp210x_gpio_init(struct usb_serial * serial)1967 static int cp210x_gpio_init(struct usb_serial *serial)
1968 {
1969 return 0;
1970 }
1971
cp210x_gpio_remove(struct usb_serial * serial)1972 static void cp210x_gpio_remove(struct usb_serial *serial)
1973 {
1974 /* Nothing to do */
1975 }
1976
1977 #endif
1978
cp210x_port_probe(struct usb_serial_port * port)1979 static int cp210x_port_probe(struct usb_serial_port *port)
1980 {
1981 struct usb_serial *serial = port->serial;
1982 struct cp210x_port_private *port_priv;
1983
1984 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1985 if (!port_priv)
1986 return -ENOMEM;
1987
1988 port_priv->bInterfaceNumber = cp210x_interface_num(serial);
1989 mutex_init(&port_priv->mutex);
1990
1991 usb_set_serial_port_data(port, port_priv);
1992
1993 return 0;
1994 }
1995
cp210x_port_remove(struct usb_serial_port * port)1996 static void cp210x_port_remove(struct usb_serial_port *port)
1997 {
1998 struct cp210x_port_private *port_priv;
1999
2000 port_priv = usb_get_serial_port_data(port);
2001 kfree(port_priv);
2002 }
2003
cp210x_init_max_speed(struct usb_serial * serial)2004 static void cp210x_init_max_speed(struct usb_serial *serial)
2005 {
2006 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2007 bool use_actual_rate = false;
2008 speed_t min = 300;
2009 speed_t max;
2010
2011 switch (priv->partnum) {
2012 case CP210X_PARTNUM_CP2101:
2013 max = 921600;
2014 break;
2015 case CP210X_PARTNUM_CP2102:
2016 case CP210X_PARTNUM_CP2103:
2017 max = 1000000;
2018 break;
2019 case CP210X_PARTNUM_CP2104:
2020 use_actual_rate = true;
2021 max = 2000000;
2022 break;
2023 case CP210X_PARTNUM_CP2108:
2024 max = 2000000;
2025 break;
2026 case CP210X_PARTNUM_CP2105:
2027 if (cp210x_interface_num(serial) == 0) {
2028 use_actual_rate = true;
2029 max = 2000000; /* ECI */
2030 } else {
2031 min = 2400;
2032 max = 921600; /* SCI */
2033 }
2034 break;
2035 case CP210X_PARTNUM_CP2102N_QFN28:
2036 case CP210X_PARTNUM_CP2102N_QFN24:
2037 case CP210X_PARTNUM_CP2102N_QFN20:
2038 use_actual_rate = true;
2039 max = 3000000;
2040 break;
2041 default:
2042 max = 2000000;
2043 break;
2044 }
2045
2046 priv->min_speed = min;
2047 priv->max_speed = max;
2048 priv->use_actual_rate = use_actual_rate;
2049 }
2050
cp2102_determine_quirks(struct usb_serial * serial)2051 static void cp2102_determine_quirks(struct usb_serial *serial)
2052 {
2053 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2054 u8 *buf;
2055 int ret;
2056
2057 buf = kmalloc(2, GFP_KERNEL);
2058 if (!buf)
2059 return;
2060 /*
2061 * Some (possibly counterfeit) CP2102 do not support event-insertion
2062 * mode and respond differently to malformed vendor requests.
2063 * Specifically, they return one instead of two bytes when sent a
2064 * two-byte part-number request.
2065 */
2066 ret = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2067 CP210X_VENDOR_SPECIFIC, REQTYPE_DEVICE_TO_HOST,
2068 CP210X_GET_PARTNUM, 0, buf, 2, USB_CTRL_GET_TIMEOUT);
2069 if (ret == 1) {
2070 dev_dbg(&serial->interface->dev,
2071 "device does not support event-insertion mode\n");
2072 priv->no_event_mode = true;
2073 }
2074
2075 kfree(buf);
2076 }
2077
cp210x_get_fw_version(struct usb_serial * serial,u16 value)2078 static int cp210x_get_fw_version(struct usb_serial *serial, u16 value)
2079 {
2080 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2081 u8 ver[3];
2082 int ret;
2083
2084 ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, value,
2085 ver, sizeof(ver));
2086 if (ret)
2087 return ret;
2088
2089 dev_dbg(&serial->interface->dev, "%s - %d.%d.%d\n", __func__,
2090 ver[0], ver[1], ver[2]);
2091
2092 priv->fw_version = ver[0] << 16 | ver[1] << 8 | ver[2];
2093
2094 return 0;
2095 }
2096
cp210x_determine_type(struct usb_serial * serial)2097 static void cp210x_determine_type(struct usb_serial *serial)
2098 {
2099 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2100 int ret;
2101
2102 ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
2103 CP210X_GET_PARTNUM, &priv->partnum,
2104 sizeof(priv->partnum));
2105 if (ret < 0) {
2106 dev_warn(&serial->interface->dev,
2107 "querying part number failed\n");
2108 priv->partnum = CP210X_PARTNUM_UNKNOWN;
2109 return;
2110 }
2111
2112 dev_dbg(&serial->interface->dev, "partnum = 0x%02x\n", priv->partnum);
2113
2114 switch (priv->partnum) {
2115 case CP210X_PARTNUM_CP2102:
2116 cp2102_determine_quirks(serial);
2117 break;
2118 case CP210X_PARTNUM_CP2105:
2119 case CP210X_PARTNUM_CP2108:
2120 cp210x_get_fw_version(serial, CP210X_GET_FW_VER);
2121 break;
2122 case CP210X_PARTNUM_CP2102N_QFN28:
2123 case CP210X_PARTNUM_CP2102N_QFN24:
2124 case CP210X_PARTNUM_CP2102N_QFN20:
2125 ret = cp210x_get_fw_version(serial, CP210X_GET_FW_VER_2N);
2126 if (ret)
2127 break;
2128 if (priv->fw_version <= 0x10004)
2129 priv->no_flow_control = true;
2130 break;
2131 default:
2132 break;
2133 }
2134 }
2135
cp210x_attach(struct usb_serial * serial)2136 static int cp210x_attach(struct usb_serial *serial)
2137 {
2138 int result;
2139 struct cp210x_serial_private *priv;
2140
2141 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2142 if (!priv)
2143 return -ENOMEM;
2144
2145 usb_set_serial_data(serial, priv);
2146
2147 cp210x_determine_type(serial);
2148 cp210x_init_max_speed(serial);
2149
2150 result = cp210x_gpio_init(serial);
2151 if (result < 0) {
2152 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n",
2153 result);
2154 }
2155
2156 return 0;
2157 }
2158
cp210x_disconnect(struct usb_serial * serial)2159 static void cp210x_disconnect(struct usb_serial *serial)
2160 {
2161 cp210x_gpio_remove(serial);
2162 }
2163
cp210x_release(struct usb_serial * serial)2164 static void cp210x_release(struct usb_serial *serial)
2165 {
2166 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2167
2168 cp210x_gpio_remove(serial);
2169
2170 kfree(priv);
2171 }
2172
2173 module_usb_serial_driver(serial_drivers, id_table);
2174
2175 MODULE_DESCRIPTION(DRIVER_DESC);
2176 MODULE_LICENSE("GPL v2");
2177