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 struct ktermios *);
35 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
36 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 void *dmabuf;
645 int result;
646
647 dmabuf = kmalloc(bufsize, GFP_KERNEL);
648 if (!dmabuf)
649 return -ENOMEM;
650
651 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
652 req, REQTYPE_INTERFACE_TO_HOST, 0,
653 port_priv->bInterfaceNumber, dmabuf, bufsize,
654 USB_CTRL_GET_TIMEOUT);
655 if (result == bufsize) {
656 memcpy(buf, dmabuf, bufsize);
657 result = 0;
658 } else {
659 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
660 req, bufsize, result);
661 if (result >= 0)
662 result = -EIO;
663 }
664
665 kfree(dmabuf);
666
667 return result;
668 }
669
670 /*
671 * Reads any 8-bit CP210X_ register identified by req.
672 */
cp210x_read_u8_reg(struct usb_serial_port * port,u8 req,u8 * val)673 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
674 {
675 return cp210x_read_reg_block(port, req, val, sizeof(*val));
676 }
677
678 /*
679 * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
680 * Returns data into buf in native USB byte order.
681 */
cp210x_read_vendor_block(struct usb_serial * serial,u8 type,u16 val,void * buf,int bufsize)682 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
683 void *buf, int bufsize)
684 {
685 void *dmabuf;
686 int result;
687
688 dmabuf = kmalloc(bufsize, GFP_KERNEL);
689 if (!dmabuf)
690 return -ENOMEM;
691
692 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
693 CP210X_VENDOR_SPECIFIC, type, val,
694 cp210x_interface_num(serial), dmabuf, bufsize,
695 USB_CTRL_GET_TIMEOUT);
696 if (result == bufsize) {
697 memcpy(buf, dmabuf, bufsize);
698 result = 0;
699 } else {
700 dev_err(&serial->interface->dev,
701 "failed to get vendor val 0x%04x size %d: %d\n", val,
702 bufsize, result);
703 if (result >= 0)
704 result = -EIO;
705 }
706
707 kfree(dmabuf);
708
709 return result;
710 }
711
712 /*
713 * Writes any 16-bit CP210X_ register (req) whose value is passed
714 * entirely in the wValue field of the USB request.
715 */
cp210x_write_u16_reg(struct usb_serial_port * port,u8 req,u16 val)716 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
717 {
718 struct usb_serial *serial = port->serial;
719 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
720 int result;
721
722 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
723 req, REQTYPE_HOST_TO_INTERFACE, val,
724 port_priv->bInterfaceNumber, NULL, 0,
725 USB_CTRL_SET_TIMEOUT);
726 if (result < 0) {
727 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
728 req, result);
729 }
730
731 return result;
732 }
733
734 /*
735 * Writes a variable-sized block of CP210X_ registers, identified by req.
736 * Data in buf must be in native USB byte order.
737 */
cp210x_write_reg_block(struct usb_serial_port * port,u8 req,void * buf,int bufsize)738 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
739 void *buf, int bufsize)
740 {
741 struct usb_serial *serial = port->serial;
742 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
743 void *dmabuf;
744 int result;
745
746 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
747 if (!dmabuf)
748 return -ENOMEM;
749
750 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
751 req, REQTYPE_HOST_TO_INTERFACE, 0,
752 port_priv->bInterfaceNumber, dmabuf, bufsize,
753 USB_CTRL_SET_TIMEOUT);
754
755 kfree(dmabuf);
756
757 if (result < 0) {
758 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
759 req, bufsize, result);
760 return result;
761 }
762
763 return 0;
764 }
765
766 /*
767 * Writes any 32-bit CP210X_ register identified by req.
768 */
cp210x_write_u32_reg(struct usb_serial_port * port,u8 req,u32 val)769 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
770 {
771 __le32 le32_val;
772
773 le32_val = cpu_to_le32(val);
774
775 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
776 }
777
778 #ifdef CONFIG_GPIOLIB
779 /*
780 * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
781 * Data in buf must be in native USB byte order.
782 */
cp210x_write_vendor_block(struct usb_serial * serial,u8 type,u16 val,void * buf,int bufsize)783 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
784 u16 val, void *buf, int bufsize)
785 {
786 void *dmabuf;
787 int result;
788
789 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
790 if (!dmabuf)
791 return -ENOMEM;
792
793 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
794 CP210X_VENDOR_SPECIFIC, type, val,
795 cp210x_interface_num(serial), dmabuf, bufsize,
796 USB_CTRL_SET_TIMEOUT);
797
798 kfree(dmabuf);
799
800 if (result < 0) {
801 dev_err(&serial->interface->dev,
802 "failed to set vendor val 0x%04x size %d: %d\n", val,
803 bufsize, result);
804 return result;
805 }
806
807 return 0;
808 }
809 #endif
810
cp210x_open(struct tty_struct * tty,struct usb_serial_port * port)811 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
812 {
813 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
814 int result;
815
816 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
817 if (result) {
818 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
819 return result;
820 }
821
822 if (tty)
823 cp210x_set_termios(tty, port, NULL);
824
825 result = usb_serial_generic_open(tty, port);
826 if (result)
827 goto err_disable;
828
829 return 0;
830
831 err_disable:
832 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
833 port_priv->event_mode = false;
834
835 return result;
836 }
837
cp210x_close(struct usb_serial_port * port)838 static void cp210x_close(struct usb_serial_port *port)
839 {
840 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
841
842 usb_serial_generic_close(port);
843
844 /* Clear both queues; cp2108 needs this to avoid an occasional hang */
845 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
846
847 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
848
849 /* Disabling the interface disables event-insertion mode. */
850 port_priv->event_mode = false;
851 }
852
cp210x_process_lsr(struct usb_serial_port * port,unsigned char lsr,char * flag)853 static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag)
854 {
855 if (lsr & CP210X_LSR_BREAK) {
856 port->icount.brk++;
857 *flag = TTY_BREAK;
858 } else if (lsr & CP210X_LSR_PARITY) {
859 port->icount.parity++;
860 *flag = TTY_PARITY;
861 } else if (lsr & CP210X_LSR_FRAME) {
862 port->icount.frame++;
863 *flag = TTY_FRAME;
864 }
865
866 if (lsr & CP210X_LSR_OVERRUN) {
867 port->icount.overrun++;
868 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
869 }
870 }
871
cp210x_process_char(struct usb_serial_port * port,unsigned char * ch,char * flag)872 static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag)
873 {
874 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
875
876 switch (port_priv->event_state) {
877 case ES_DATA:
878 if (*ch == CP210X_ESCCHAR) {
879 port_priv->event_state = ES_ESCAPE;
880 break;
881 }
882 return false;
883 case ES_ESCAPE:
884 switch (*ch) {
885 case 0:
886 dev_dbg(&port->dev, "%s - escape char\n", __func__);
887 *ch = CP210X_ESCCHAR;
888 port_priv->event_state = ES_DATA;
889 return false;
890 case 1:
891 port_priv->event_state = ES_LSR_DATA_0;
892 break;
893 case 2:
894 port_priv->event_state = ES_LSR;
895 break;
896 case 3:
897 port_priv->event_state = ES_MSR;
898 break;
899 default:
900 dev_err(&port->dev, "malformed event 0x%02x\n", *ch);
901 port_priv->event_state = ES_DATA;
902 break;
903 }
904 break;
905 case ES_LSR_DATA_0:
906 port_priv->lsr = *ch;
907 port_priv->event_state = ES_LSR_DATA_1;
908 break;
909 case ES_LSR_DATA_1:
910 dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n",
911 __func__, port_priv->lsr, *ch);
912 cp210x_process_lsr(port, port_priv->lsr, flag);
913 port_priv->event_state = ES_DATA;
914 return false;
915 case ES_LSR:
916 dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch);
917 port_priv->lsr = *ch;
918 cp210x_process_lsr(port, port_priv->lsr, flag);
919 port_priv->event_state = ES_DATA;
920 break;
921 case ES_MSR:
922 dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch);
923 /* unimplemented */
924 port_priv->event_state = ES_DATA;
925 break;
926 }
927
928 return true;
929 }
930
cp210x_process_read_urb(struct urb * urb)931 static void cp210x_process_read_urb(struct urb *urb)
932 {
933 struct usb_serial_port *port = urb->context;
934 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
935 unsigned char *ch = urb->transfer_buffer;
936 char flag;
937 int i;
938
939 if (!urb->actual_length)
940 return;
941
942 if (port_priv->event_mode) {
943 for (i = 0; i < urb->actual_length; i++, ch++) {
944 flag = TTY_NORMAL;
945
946 if (cp210x_process_char(port, ch, &flag))
947 continue;
948
949 tty_insert_flip_char(&port->port, *ch, flag);
950 }
951 } else {
952 tty_insert_flip_string(&port->port, ch, urb->actual_length);
953 }
954 tty_flip_buffer_push(&port->port);
955 }
956
957 /*
958 * Read how many bytes are waiting in the TX queue.
959 */
cp210x_get_tx_queue_byte_count(struct usb_serial_port * port,u32 * count)960 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
961 u32 *count)
962 {
963 struct usb_serial *serial = port->serial;
964 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
965 struct cp210x_comm_status *sts;
966 int result;
967
968 sts = kmalloc(sizeof(*sts), GFP_KERNEL);
969 if (!sts)
970 return -ENOMEM;
971
972 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
973 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
974 0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
975 USB_CTRL_GET_TIMEOUT);
976 if (result == sizeof(*sts)) {
977 *count = le32_to_cpu(sts->ulAmountInOutQueue);
978 result = 0;
979 } else {
980 dev_err(&port->dev, "failed to get comm status: %d\n", result);
981 if (result >= 0)
982 result = -EIO;
983 }
984
985 kfree(sts);
986
987 return result;
988 }
989
cp210x_tx_empty(struct usb_serial_port * port)990 static bool cp210x_tx_empty(struct usb_serial_port *port)
991 {
992 int err;
993 u32 count;
994
995 err = cp210x_get_tx_queue_byte_count(port, &count);
996 if (err)
997 return true;
998
999 return !count;
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 */
cp210x_get_an205_rate(speed_t baud)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
cp210x_get_actual_rate(speed_t baud)1054 static speed_t cp210x_get_actual_rate(speed_t baud)
1055 {
1056 unsigned int prescale = 1;
1057 unsigned int div;
1058
1059 if (baud <= 365)
1060 prescale = 4;
1061
1062 div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud);
1063 baud = 48000000 / (2 * prescale * div);
1064
1065 return baud;
1066 }
1067
1068 /*
1069 * CP2101 supports the following baud rates:
1070 *
1071 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
1072 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
1073 *
1074 * CP2102 and CP2103 support the following additional rates:
1075 *
1076 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
1077 * 576000
1078 *
1079 * The device will map a requested rate to a supported one, but the result
1080 * of requests for rates greater than 1053257 is undefined (see AN205).
1081 *
1082 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
1083 * respectively, with an error less than 1%. The actual rates are determined
1084 * by
1085 *
1086 * div = round(freq / (2 x prescale x request))
1087 * actual = freq / (2 x prescale x div)
1088 *
1089 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1090 * or 1 otherwise.
1091 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1092 * otherwise.
1093 */
cp210x_change_speed(struct tty_struct * tty,struct usb_serial_port * port,struct ktermios * old_termios)1094 static void cp210x_change_speed(struct tty_struct *tty,
1095 struct usb_serial_port *port, struct ktermios *old_termios)
1096 {
1097 struct usb_serial *serial = port->serial;
1098 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1099 u32 baud;
1100
1101 /*
1102 * This maps the requested rate to the actual rate, a valid rate on
1103 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed].
1104 *
1105 * NOTE: B0 is not implemented.
1106 */
1107 baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed);
1108
1109 if (priv->use_actual_rate)
1110 baud = cp210x_get_actual_rate(baud);
1111 else if (baud < 1000000)
1112 baud = cp210x_get_an205_rate(baud);
1113
1114 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1115 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1116 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1117 if (old_termios)
1118 baud = old_termios->c_ospeed;
1119 else
1120 baud = 9600;
1121 }
1122
1123 tty_encode_baud_rate(tty, baud, baud);
1124 }
1125
cp210x_enable_event_mode(struct usb_serial_port * port)1126 static void cp210x_enable_event_mode(struct usb_serial_port *port)
1127 {
1128 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1129 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1130 int ret;
1131
1132 if (port_priv->event_mode)
1133 return;
1134
1135 if (priv->no_event_mode)
1136 return;
1137
1138 port_priv->event_state = ES_DATA;
1139 port_priv->event_mode = true;
1140
1141 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR);
1142 if (ret) {
1143 dev_err(&port->dev, "failed to enable events: %d\n", ret);
1144 port_priv->event_mode = false;
1145 }
1146 }
1147
cp210x_disable_event_mode(struct usb_serial_port * port)1148 static void cp210x_disable_event_mode(struct usb_serial_port *port)
1149 {
1150 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1151 int ret;
1152
1153 if (!port_priv->event_mode)
1154 return;
1155
1156 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0);
1157 if (ret) {
1158 dev_err(&port->dev, "failed to disable events: %d\n", ret);
1159 return;
1160 }
1161
1162 port_priv->event_mode = false;
1163 }
1164
cp210x_termios_change(const struct ktermios * a,const struct ktermios * b)1165 static bool cp210x_termios_change(const struct ktermios *a, const struct ktermios *b)
1166 {
1167 bool iflag_change, cc_change;
1168
1169 iflag_change = ((a->c_iflag ^ b->c_iflag) & (INPCK | IXON | IXOFF));
1170 cc_change = a->c_cc[VSTART] != b->c_cc[VSTART] ||
1171 a->c_cc[VSTOP] != b->c_cc[VSTOP];
1172
1173 return tty_termios_hw_change(a, b) || iflag_change || cc_change;
1174 }
1175
cp210x_set_flow_control(struct tty_struct * tty,struct usb_serial_port * port,struct ktermios * old_termios)1176 static void cp210x_set_flow_control(struct tty_struct *tty,
1177 struct usb_serial_port *port, struct ktermios *old_termios)
1178 {
1179 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1180 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1181 struct cp210x_special_chars chars;
1182 struct cp210x_flow_ctl flow_ctl;
1183 u32 flow_repl;
1184 u32 ctl_hs;
1185 bool crtscts;
1186 int ret;
1187
1188 /*
1189 * Some CP2102N interpret ulXonLimit as ulFlowReplace (erratum
1190 * CP2102N_E104). Report back that flow control is not supported.
1191 */
1192 if (priv->no_flow_control) {
1193 tty->termios.c_cflag &= ~CRTSCTS;
1194 tty->termios.c_iflag &= ~(IXON | IXOFF);
1195 }
1196
1197 if (old_termios &&
1198 C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS) &&
1199 I_IXON(tty) == (old_termios->c_iflag & IXON) &&
1200 I_IXOFF(tty) == (old_termios->c_iflag & IXOFF) &&
1201 START_CHAR(tty) == old_termios->c_cc[VSTART] &&
1202 STOP_CHAR(tty) == old_termios->c_cc[VSTOP]) {
1203 return;
1204 }
1205
1206 if (I_IXON(tty) || I_IXOFF(tty)) {
1207 memset(&chars, 0, sizeof(chars));
1208
1209 chars.bXonChar = START_CHAR(tty);
1210 chars.bXoffChar = STOP_CHAR(tty);
1211
1212 ret = cp210x_write_reg_block(port, CP210X_SET_CHARS, &chars,
1213 sizeof(chars));
1214 if (ret) {
1215 dev_err(&port->dev, "failed to set special chars: %d\n",
1216 ret);
1217 }
1218 }
1219
1220 mutex_lock(&port_priv->mutex);
1221
1222 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1223 sizeof(flow_ctl));
1224 if (ret)
1225 goto out_unlock;
1226
1227 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1228 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1229
1230 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1231 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1232 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1233 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1234 if (port_priv->dtr)
1235 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE;
1236 else
1237 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE;
1238
1239 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1240 if (C_CRTSCTS(tty)) {
1241 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1242 if (port_priv->rts)
1243 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL;
1244 else
1245 flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1246 crtscts = true;
1247 } else {
1248 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1249 if (port_priv->rts)
1250 flow_repl |= CP210X_SERIAL_RTS_ACTIVE;
1251 else
1252 flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1253 crtscts = false;
1254 }
1255
1256 if (I_IXOFF(tty)) {
1257 flow_repl |= CP210X_SERIAL_AUTO_RECEIVE;
1258
1259 flow_ctl.ulXonLimit = cpu_to_le32(128);
1260 flow_ctl.ulXoffLimit = cpu_to_le32(128);
1261 } else {
1262 flow_repl &= ~CP210X_SERIAL_AUTO_RECEIVE;
1263 }
1264
1265 if (I_IXON(tty))
1266 flow_repl |= CP210X_SERIAL_AUTO_TRANSMIT;
1267 else
1268 flow_repl &= ~CP210X_SERIAL_AUTO_TRANSMIT;
1269
1270 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", __func__,
1271 ctl_hs, flow_repl);
1272
1273 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1274 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1275
1276 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1277 sizeof(flow_ctl));
1278 if (ret)
1279 goto out_unlock;
1280
1281 port_priv->crtscts = crtscts;
1282 out_unlock:
1283 mutex_unlock(&port_priv->mutex);
1284 }
1285
cp210x_set_termios(struct tty_struct * tty,struct usb_serial_port * port,struct ktermios * old_termios)1286 static void cp210x_set_termios(struct tty_struct *tty,
1287 struct usb_serial_port *port, struct ktermios *old_termios)
1288 {
1289 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1290 u16 bits;
1291 int ret;
1292
1293 if (old_termios && !cp210x_termios_change(&tty->termios, old_termios))
1294 return;
1295
1296 if (!old_termios || tty->termios.c_ospeed != old_termios->c_ospeed)
1297 cp210x_change_speed(tty, port, old_termios);
1298
1299 /* CP2101 only supports CS8, 1 stop bit and non-stick parity. */
1300 if (priv->partnum == CP210X_PARTNUM_CP2101) {
1301 tty->termios.c_cflag &= ~(CSIZE | CSTOPB | CMSPAR);
1302 tty->termios.c_cflag |= CS8;
1303 }
1304
1305 bits = 0;
1306
1307 switch (C_CSIZE(tty)) {
1308 case CS5:
1309 bits |= BITS_DATA_5;
1310 break;
1311 case CS6:
1312 bits |= BITS_DATA_6;
1313 break;
1314 case CS7:
1315 bits |= BITS_DATA_7;
1316 break;
1317 case CS8:
1318 default:
1319 bits |= BITS_DATA_8;
1320 break;
1321 }
1322
1323 if (C_PARENB(tty)) {
1324 if (C_CMSPAR(tty)) {
1325 if (C_PARODD(tty))
1326 bits |= BITS_PARITY_MARK;
1327 else
1328 bits |= BITS_PARITY_SPACE;
1329 } else {
1330 if (C_PARODD(tty))
1331 bits |= BITS_PARITY_ODD;
1332 else
1333 bits |= BITS_PARITY_EVEN;
1334 }
1335 }
1336
1337 if (C_CSTOPB(tty))
1338 bits |= BITS_STOP_2;
1339 else
1340 bits |= BITS_STOP_1;
1341
1342 ret = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1343 if (ret)
1344 dev_err(&port->dev, "failed to set line control: %d\n", ret);
1345
1346 cp210x_set_flow_control(tty, port, old_termios);
1347
1348 /*
1349 * Enable event-insertion mode only if input parity checking is
1350 * enabled for now.
1351 */
1352 if (I_INPCK(tty))
1353 cp210x_enable_event_mode(port);
1354 else
1355 cp210x_disable_event_mode(port);
1356 }
1357
cp210x_tiocmset(struct tty_struct * tty,unsigned int set,unsigned int clear)1358 static int cp210x_tiocmset(struct tty_struct *tty,
1359 unsigned int set, unsigned int clear)
1360 {
1361 struct usb_serial_port *port = tty->driver_data;
1362 return cp210x_tiocmset_port(port, set, clear);
1363 }
1364
cp210x_tiocmset_port(struct usb_serial_port * port,unsigned int set,unsigned int clear)1365 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1366 unsigned int set, unsigned int clear)
1367 {
1368 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1369 struct cp210x_flow_ctl flow_ctl;
1370 u32 ctl_hs, flow_repl;
1371 u16 control = 0;
1372 int ret;
1373
1374 mutex_lock(&port_priv->mutex);
1375
1376 if (set & TIOCM_RTS) {
1377 port_priv->rts = true;
1378 control |= CONTROL_RTS;
1379 control |= CONTROL_WRITE_RTS;
1380 }
1381 if (set & TIOCM_DTR) {
1382 port_priv->dtr = true;
1383 control |= CONTROL_DTR;
1384 control |= CONTROL_WRITE_DTR;
1385 }
1386 if (clear & TIOCM_RTS) {
1387 port_priv->rts = false;
1388 control &= ~CONTROL_RTS;
1389 control |= CONTROL_WRITE_RTS;
1390 }
1391 if (clear & TIOCM_DTR) {
1392 port_priv->dtr = false;
1393 control &= ~CONTROL_DTR;
1394 control |= CONTROL_WRITE_DTR;
1395 }
1396
1397 /*
1398 * Use SET_FLOW to set DTR and enable/disable auto-RTS when hardware
1399 * flow control is enabled.
1400 */
1401 if (port_priv->crtscts && control & CONTROL_WRITE_RTS) {
1402 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1403 sizeof(flow_ctl));
1404 if (ret)
1405 goto out_unlock;
1406
1407 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1408 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1409
1410 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1411 if (port_priv->dtr)
1412 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE;
1413 else
1414 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE;
1415
1416 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1417 if (port_priv->rts)
1418 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL;
1419 else
1420 flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1421
1422 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1423 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1424
1425 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n",
1426 __func__, ctl_hs, flow_repl);
1427
1428 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1429 sizeof(flow_ctl));
1430 } else {
1431 dev_dbg(&port->dev, "%s - control = 0x%04x\n", __func__, control);
1432
1433 ret = cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1434 }
1435 out_unlock:
1436 mutex_unlock(&port_priv->mutex);
1437
1438 return ret;
1439 }
1440
cp210x_dtr_rts(struct usb_serial_port * port,int on)1441 static void cp210x_dtr_rts(struct usb_serial_port *port, int on)
1442 {
1443 if (on)
1444 cp210x_tiocmset_port(port, TIOCM_DTR | TIOCM_RTS, 0);
1445 else
1446 cp210x_tiocmset_port(port, 0, TIOCM_DTR | TIOCM_RTS);
1447 }
1448
cp210x_tiocmget(struct tty_struct * tty)1449 static int cp210x_tiocmget(struct tty_struct *tty)
1450 {
1451 struct usb_serial_port *port = tty->driver_data;
1452 u8 control;
1453 int result;
1454
1455 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1456 if (result)
1457 return result;
1458
1459 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1460 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1461 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1462 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1463 |((control & CONTROL_RING)? TIOCM_RI : 0)
1464 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
1465
1466 dev_dbg(&port->dev, "%s - control = 0x%02x\n", __func__, control);
1467
1468 return result;
1469 }
1470
cp210x_break_ctl(struct tty_struct * tty,int break_state)1471 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1472 {
1473 struct usb_serial_port *port = tty->driver_data;
1474 u16 state;
1475
1476 if (break_state == 0)
1477 state = BREAK_OFF;
1478 else
1479 state = BREAK_ON;
1480 dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1481 state == BREAK_OFF ? "off" : "on");
1482 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1483 }
1484
1485 #ifdef CONFIG_GPIOLIB
cp210x_gpio_get(struct gpio_chip * gc,unsigned int gpio)1486 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1487 {
1488 struct usb_serial *serial = gpiochip_get_data(gc);
1489 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1490 u8 req_type;
1491 u16 mask;
1492 int result;
1493 int len;
1494
1495 result = usb_autopm_get_interface(serial->interface);
1496 if (result)
1497 return result;
1498
1499 switch (priv->partnum) {
1500 case CP210X_PARTNUM_CP2105:
1501 req_type = REQTYPE_INTERFACE_TO_HOST;
1502 len = 1;
1503 break;
1504 case CP210X_PARTNUM_CP2108:
1505 req_type = REQTYPE_INTERFACE_TO_HOST;
1506 len = 2;
1507 break;
1508 default:
1509 req_type = REQTYPE_DEVICE_TO_HOST;
1510 len = 1;
1511 break;
1512 }
1513
1514 mask = 0;
1515 result = cp210x_read_vendor_block(serial, req_type, CP210X_READ_LATCH,
1516 &mask, len);
1517
1518 usb_autopm_put_interface(serial->interface);
1519
1520 if (result < 0)
1521 return result;
1522
1523 le16_to_cpus(&mask);
1524
1525 return !!(mask & BIT(gpio));
1526 }
1527
cp210x_gpio_set(struct gpio_chip * gc,unsigned int gpio,int value)1528 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1529 {
1530 struct usb_serial *serial = gpiochip_get_data(gc);
1531 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1532 struct cp210x_gpio_write16 buf16;
1533 struct cp210x_gpio_write buf;
1534 u16 mask, state;
1535 u16 wIndex;
1536 int result;
1537
1538 if (value == 1)
1539 state = BIT(gpio);
1540 else
1541 state = 0;
1542
1543 mask = BIT(gpio);
1544
1545 result = usb_autopm_get_interface(serial->interface);
1546 if (result)
1547 goto out;
1548
1549 switch (priv->partnum) {
1550 case CP210X_PARTNUM_CP2105:
1551 buf.mask = (u8)mask;
1552 buf.state = (u8)state;
1553 result = cp210x_write_vendor_block(serial,
1554 REQTYPE_HOST_TO_INTERFACE,
1555 CP210X_WRITE_LATCH, &buf,
1556 sizeof(buf));
1557 break;
1558 case CP210X_PARTNUM_CP2108:
1559 buf16.mask = cpu_to_le16(mask);
1560 buf16.state = cpu_to_le16(state);
1561 result = cp210x_write_vendor_block(serial,
1562 REQTYPE_HOST_TO_INTERFACE,
1563 CP210X_WRITE_LATCH, &buf16,
1564 sizeof(buf16));
1565 break;
1566 default:
1567 wIndex = state << 8 | mask;
1568 result = usb_control_msg(serial->dev,
1569 usb_sndctrlpipe(serial->dev, 0),
1570 CP210X_VENDOR_SPECIFIC,
1571 REQTYPE_HOST_TO_DEVICE,
1572 CP210X_WRITE_LATCH,
1573 wIndex,
1574 NULL, 0, USB_CTRL_SET_TIMEOUT);
1575 break;
1576 }
1577
1578 usb_autopm_put_interface(serial->interface);
1579 out:
1580 if (result < 0) {
1581 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n",
1582 result);
1583 }
1584 }
1585
cp210x_gpio_direction_get(struct gpio_chip * gc,unsigned int gpio)1586 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1587 {
1588 struct usb_serial *serial = gpiochip_get_data(gc);
1589 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1590
1591 return priv->gpio_input & BIT(gpio);
1592 }
1593
cp210x_gpio_direction_input(struct gpio_chip * gc,unsigned int gpio)1594 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
1595 {
1596 struct usb_serial *serial = gpiochip_get_data(gc);
1597 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1598
1599 if (priv->partnum == CP210X_PARTNUM_CP2105) {
1600 /* hardware does not support an input mode */
1601 return -ENOTSUPP;
1602 }
1603
1604 /* push-pull pins cannot be changed to be inputs */
1605 if (priv->gpio_pushpull & BIT(gpio))
1606 return -EINVAL;
1607
1608 /* make sure to release pin if it is being driven low */
1609 cp210x_gpio_set(gc, gpio, 1);
1610
1611 priv->gpio_input |= BIT(gpio);
1612
1613 return 0;
1614 }
1615
cp210x_gpio_direction_output(struct gpio_chip * gc,unsigned int gpio,int value)1616 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1617 int value)
1618 {
1619 struct usb_serial *serial = gpiochip_get_data(gc);
1620 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1621
1622 priv->gpio_input &= ~BIT(gpio);
1623 cp210x_gpio_set(gc, gpio, value);
1624
1625 return 0;
1626 }
1627
cp210x_gpio_set_config(struct gpio_chip * gc,unsigned int gpio,unsigned long config)1628 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
1629 unsigned long config)
1630 {
1631 struct usb_serial *serial = gpiochip_get_data(gc);
1632 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1633 enum pin_config_param param = pinconf_to_config_param(config);
1634
1635 /* Succeed only if in correct mode (this can't be set at runtime) */
1636 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) &&
1637 (priv->gpio_pushpull & BIT(gpio)))
1638 return 0;
1639
1640 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) &&
1641 !(priv->gpio_pushpull & BIT(gpio)))
1642 return 0;
1643
1644 return -ENOTSUPP;
1645 }
1646
cp210x_gpio_init_valid_mask(struct gpio_chip * gc,unsigned long * valid_mask,unsigned int ngpios)1647 static int cp210x_gpio_init_valid_mask(struct gpio_chip *gc,
1648 unsigned long *valid_mask, unsigned int ngpios)
1649 {
1650 struct usb_serial *serial = gpiochip_get_data(gc);
1651 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1652 struct device *dev = &serial->interface->dev;
1653 unsigned long altfunc_mask = priv->gpio_altfunc;
1654
1655 bitmap_complement(valid_mask, &altfunc_mask, ngpios);
1656
1657 if (bitmap_empty(valid_mask, ngpios))
1658 dev_dbg(dev, "no pin configured for GPIO\n");
1659 else
1660 dev_dbg(dev, "GPIO.%*pbl configured for GPIO\n", ngpios,
1661 valid_mask);
1662 return 0;
1663 }
1664
1665 /*
1666 * This function is for configuring GPIO using shared pins, where other signals
1667 * are made unavailable by configuring the use of GPIO. This is believed to be
1668 * only applicable to the cp2105 at this point, the other devices supported by
1669 * this driver that provide GPIO do so in a way that does not impact other
1670 * signals and are thus expected to have very different initialisation.
1671 */
cp2105_gpioconf_init(struct usb_serial * serial)1672 static int cp2105_gpioconf_init(struct usb_serial *serial)
1673 {
1674 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1675 struct cp210x_pin_mode mode;
1676 struct cp210x_dual_port_config config;
1677 u8 intf_num = cp210x_interface_num(serial);
1678 u8 iface_config;
1679 int result;
1680
1681 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1682 CP210X_GET_DEVICEMODE, &mode,
1683 sizeof(mode));
1684 if (result < 0)
1685 return result;
1686
1687 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1688 CP210X_GET_PORTCONFIG, &config,
1689 sizeof(config));
1690 if (result < 0)
1691 return result;
1692
1693 /* 2 banks of GPIO - One for the pins taken from each serial port */
1694 if (intf_num == 0) {
1695 priv->gc.ngpio = 2;
1696
1697 if (mode.eci == CP210X_PIN_MODE_MODEM) {
1698 /* mark all GPIOs of this interface as reserved */
1699 priv->gpio_altfunc = 0xff;
1700 return 0;
1701 }
1702
1703 iface_config = config.eci_cfg;
1704 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1705 CP210X_ECI_GPIO_MODE_MASK) >>
1706 CP210X_ECI_GPIO_MODE_OFFSET);
1707 } else if (intf_num == 1) {
1708 priv->gc.ngpio = 3;
1709
1710 if (mode.sci == CP210X_PIN_MODE_MODEM) {
1711 /* mark all GPIOs of this interface as reserved */
1712 priv->gpio_altfunc = 0xff;
1713 return 0;
1714 }
1715
1716 iface_config = config.sci_cfg;
1717 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1718 CP210X_SCI_GPIO_MODE_MASK) >>
1719 CP210X_SCI_GPIO_MODE_OFFSET);
1720 } else {
1721 return -ENODEV;
1722 }
1723
1724 /* mark all pins which are not in GPIO mode */
1725 if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */
1726 priv->gpio_altfunc |= BIT(0);
1727 if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */
1728 CP2105_GPIO1_RS485_MODE))
1729 priv->gpio_altfunc |= BIT(1);
1730
1731 /* driver implementation for CP2105 only supports outputs */
1732 priv->gpio_input = 0;
1733
1734 return 0;
1735 }
1736
cp2104_gpioconf_init(struct usb_serial * serial)1737 static int cp2104_gpioconf_init(struct usb_serial *serial)
1738 {
1739 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1740 struct cp210x_single_port_config config;
1741 u8 iface_config;
1742 u8 gpio_latch;
1743 int result;
1744 u8 i;
1745
1746 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1747 CP210X_GET_PORTCONFIG, &config,
1748 sizeof(config));
1749 if (result < 0)
1750 return result;
1751
1752 priv->gc.ngpio = 4;
1753
1754 iface_config = config.device_cfg;
1755 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1756 CP210X_GPIO_MODE_MASK) >>
1757 CP210X_GPIO_MODE_OFFSET);
1758 gpio_latch = (u8)((le16_to_cpu(config.reset_state) &
1759 CP210X_GPIO_MODE_MASK) >>
1760 CP210X_GPIO_MODE_OFFSET);
1761
1762 /* mark all pins which are not in GPIO mode */
1763 if (iface_config & CP2104_GPIO0_TXLED_MODE) /* GPIO 0 */
1764 priv->gpio_altfunc |= BIT(0);
1765 if (iface_config & CP2104_GPIO1_RXLED_MODE) /* GPIO 1 */
1766 priv->gpio_altfunc |= BIT(1);
1767 if (iface_config & CP2104_GPIO2_RS485_MODE) /* GPIO 2 */
1768 priv->gpio_altfunc |= BIT(2);
1769
1770 /*
1771 * Like CP2102N, CP2104 has also no strict input and output pin
1772 * modes.
1773 * Do the same input mode emulation as CP2102N.
1774 */
1775 for (i = 0; i < priv->gc.ngpio; ++i) {
1776 /*
1777 * Set direction to "input" iff pin is open-drain and reset
1778 * value is 1.
1779 */
1780 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1781 priv->gpio_input |= BIT(i);
1782 }
1783
1784 return 0;
1785 }
1786
cp2108_gpio_init(struct usb_serial * serial)1787 static int cp2108_gpio_init(struct usb_serial *serial)
1788 {
1789 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1790 struct cp210x_quad_port_config config;
1791 u16 gpio_latch;
1792 int result;
1793 u8 i;
1794
1795 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1796 CP210X_GET_PORTCONFIG, &config,
1797 sizeof(config));
1798 if (result < 0)
1799 return result;
1800
1801 priv->gc.ngpio = 16;
1802 priv->gpio_pushpull = le16_to_cpu(config.reset_state.gpio_mode_pb1);
1803 gpio_latch = le16_to_cpu(config.reset_state.gpio_latch_pb1);
1804
1805 /*
1806 * Mark all pins which are not in GPIO mode.
1807 *
1808 * Refer to table 9.1 "GPIO Mode alternate Functions" in the datasheet:
1809 * https://www.silabs.com/documents/public/data-sheets/cp2108-datasheet.pdf
1810 *
1811 * Alternate functions of GPIO0 to GPIO3 are determine by enhancedfxn_ifc[0]
1812 * and the similarly for the other pins; enhancedfxn_ifc[1]: GPIO4 to GPIO7,
1813 * enhancedfxn_ifc[2]: GPIO8 to GPIO11, enhancedfxn_ifc[3]: GPIO12 to GPIO15.
1814 */
1815 for (i = 0; i < 4; i++) {
1816 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_TXLED)
1817 priv->gpio_altfunc |= BIT(i * 4);
1818 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RXLED)
1819 priv->gpio_altfunc |= BIT((i * 4) + 1);
1820 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RS485)
1821 priv->gpio_altfunc |= BIT((i * 4) + 2);
1822 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_CLOCK)
1823 priv->gpio_altfunc |= BIT((i * 4) + 3);
1824 }
1825
1826 /*
1827 * Like CP2102N, CP2108 has also no strict input and output pin
1828 * modes. Do the same input mode emulation as CP2102N.
1829 */
1830 for (i = 0; i < priv->gc.ngpio; ++i) {
1831 /*
1832 * Set direction to "input" iff pin is open-drain and reset
1833 * value is 1.
1834 */
1835 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1836 priv->gpio_input |= BIT(i);
1837 }
1838
1839 return 0;
1840 }
1841
cp2102n_gpioconf_init(struct usb_serial * serial)1842 static int cp2102n_gpioconf_init(struct usb_serial *serial)
1843 {
1844 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1845 const u16 config_size = 0x02a6;
1846 u8 gpio_rst_latch;
1847 u8 config_version;
1848 u8 gpio_pushpull;
1849 u8 *config_buf;
1850 u8 gpio_latch;
1851 u8 gpio_ctrl;
1852 int result;
1853 u8 i;
1854
1855 /*
1856 * Retrieve device configuration from the device.
1857 * The array received contains all customization settings done at the
1858 * factory/manufacturer. Format of the array is documented at the
1859 * time of writing at:
1860 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa
1861 */
1862 config_buf = kmalloc(config_size, GFP_KERNEL);
1863 if (!config_buf)
1864 return -ENOMEM;
1865
1866 result = cp210x_read_vendor_block(serial,
1867 REQTYPE_DEVICE_TO_HOST,
1868 CP210X_READ_2NCONFIG,
1869 config_buf,
1870 config_size);
1871 if (result < 0) {
1872 kfree(config_buf);
1873 return result;
1874 }
1875
1876 config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX];
1877 gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX];
1878 gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX];
1879 gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX];
1880
1881 kfree(config_buf);
1882
1883 /* Make sure this is a config format we understand. */
1884 if (config_version != 0x01)
1885 return -ENOTSUPP;
1886
1887 priv->gc.ngpio = 4;
1888
1889 /*
1890 * Get default pin states after reset. Needed so we can determine
1891 * the direction of an open-drain pin.
1892 */
1893 gpio_latch = (gpio_rst_latch >> 3) & 0x0f;
1894
1895 /* 0 indicates open-drain mode, 1 is push-pull */
1896 priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f;
1897
1898 /* 0 indicates GPIO mode, 1 is alternate function */
1899 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN20) {
1900 /* QFN20 is special... */
1901 if (gpio_ctrl & CP2102N_QFN20_GPIO0_CLK_MODE) /* GPIO 0 */
1902 priv->gpio_altfunc |= BIT(0);
1903 if (gpio_ctrl & CP2102N_QFN20_GPIO1_RS485_MODE) /* GPIO 1 */
1904 priv->gpio_altfunc |= BIT(1);
1905 if (gpio_ctrl & CP2102N_QFN20_GPIO2_TXLED_MODE) /* GPIO 2 */
1906 priv->gpio_altfunc |= BIT(2);
1907 if (gpio_ctrl & CP2102N_QFN20_GPIO3_RXLED_MODE) /* GPIO 3 */
1908 priv->gpio_altfunc |= BIT(3);
1909 } else {
1910 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f;
1911 }
1912
1913 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) {
1914 /*
1915 * For the QFN28 package, GPIO4-6 are controlled by
1916 * the low three bits of the mode/latch fields.
1917 * Contrary to the document linked above, the bits for
1918 * the SUSPEND pins are elsewhere. No alternate
1919 * function is available for these pins.
1920 */
1921 priv->gc.ngpio = 7;
1922 gpio_latch |= (gpio_rst_latch & 7) << 4;
1923 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4;
1924 }
1925
1926 /*
1927 * The CP2102N does not strictly has input and output pin modes,
1928 * it only knows open-drain and push-pull modes which is set at
1929 * factory. An open-drain pin can function both as an
1930 * input or an output. We emulate input mode for open-drain pins
1931 * by making sure they are not driven low, and we do not allow
1932 * push-pull pins to be set as an input.
1933 */
1934 for (i = 0; i < priv->gc.ngpio; ++i) {
1935 /*
1936 * Set direction to "input" iff pin is open-drain and reset
1937 * value is 1.
1938 */
1939 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1940 priv->gpio_input |= BIT(i);
1941 }
1942
1943 return 0;
1944 }
1945
cp210x_gpio_init(struct usb_serial * serial)1946 static int cp210x_gpio_init(struct usb_serial *serial)
1947 {
1948 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1949 int result;
1950
1951 switch (priv->partnum) {
1952 case CP210X_PARTNUM_CP2104:
1953 result = cp2104_gpioconf_init(serial);
1954 break;
1955 case CP210X_PARTNUM_CP2105:
1956 result = cp2105_gpioconf_init(serial);
1957 break;
1958 case CP210X_PARTNUM_CP2108:
1959 /*
1960 * The GPIOs are not tied to any specific port so only register
1961 * once for interface 0.
1962 */
1963 if (cp210x_interface_num(serial) != 0)
1964 return 0;
1965 result = cp2108_gpio_init(serial);
1966 break;
1967 case CP210X_PARTNUM_CP2102N_QFN28:
1968 case CP210X_PARTNUM_CP2102N_QFN24:
1969 case CP210X_PARTNUM_CP2102N_QFN20:
1970 result = cp2102n_gpioconf_init(serial);
1971 break;
1972 default:
1973 return 0;
1974 }
1975
1976 if (result < 0)
1977 return result;
1978
1979 priv->gc.label = "cp210x";
1980 priv->gc.get_direction = cp210x_gpio_direction_get;
1981 priv->gc.direction_input = cp210x_gpio_direction_input;
1982 priv->gc.direction_output = cp210x_gpio_direction_output;
1983 priv->gc.get = cp210x_gpio_get;
1984 priv->gc.set = cp210x_gpio_set;
1985 priv->gc.set_config = cp210x_gpio_set_config;
1986 priv->gc.init_valid_mask = cp210x_gpio_init_valid_mask;
1987 priv->gc.owner = THIS_MODULE;
1988 priv->gc.parent = &serial->interface->dev;
1989 priv->gc.base = -1;
1990 priv->gc.can_sleep = true;
1991
1992 result = gpiochip_add_data(&priv->gc, serial);
1993 if (!result)
1994 priv->gpio_registered = true;
1995
1996 return result;
1997 }
1998
cp210x_gpio_remove(struct usb_serial * serial)1999 static void cp210x_gpio_remove(struct usb_serial *serial)
2000 {
2001 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2002
2003 if (priv->gpio_registered) {
2004 gpiochip_remove(&priv->gc);
2005 priv->gpio_registered = false;
2006 }
2007 }
2008
2009 #else
2010
cp210x_gpio_init(struct usb_serial * serial)2011 static int cp210x_gpio_init(struct usb_serial *serial)
2012 {
2013 return 0;
2014 }
2015
cp210x_gpio_remove(struct usb_serial * serial)2016 static void cp210x_gpio_remove(struct usb_serial *serial)
2017 {
2018 /* Nothing to do */
2019 }
2020
2021 #endif
2022
cp210x_port_probe(struct usb_serial_port * port)2023 static int cp210x_port_probe(struct usb_serial_port *port)
2024 {
2025 struct usb_serial *serial = port->serial;
2026 struct cp210x_port_private *port_priv;
2027
2028 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
2029 if (!port_priv)
2030 return -ENOMEM;
2031
2032 port_priv->bInterfaceNumber = cp210x_interface_num(serial);
2033 mutex_init(&port_priv->mutex);
2034
2035 usb_set_serial_port_data(port, port_priv);
2036
2037 return 0;
2038 }
2039
cp210x_port_remove(struct usb_serial_port * port)2040 static void cp210x_port_remove(struct usb_serial_port *port)
2041 {
2042 struct cp210x_port_private *port_priv;
2043
2044 port_priv = usb_get_serial_port_data(port);
2045 kfree(port_priv);
2046 }
2047
cp210x_init_max_speed(struct usb_serial * serial)2048 static void cp210x_init_max_speed(struct usb_serial *serial)
2049 {
2050 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2051 bool use_actual_rate = false;
2052 speed_t min = 300;
2053 speed_t max;
2054
2055 switch (priv->partnum) {
2056 case CP210X_PARTNUM_CP2101:
2057 max = 921600;
2058 break;
2059 case CP210X_PARTNUM_CP2102:
2060 case CP210X_PARTNUM_CP2103:
2061 max = 1000000;
2062 break;
2063 case CP210X_PARTNUM_CP2104:
2064 use_actual_rate = true;
2065 max = 2000000;
2066 break;
2067 case CP210X_PARTNUM_CP2108:
2068 max = 2000000;
2069 break;
2070 case CP210X_PARTNUM_CP2105:
2071 if (cp210x_interface_num(serial) == 0) {
2072 use_actual_rate = true;
2073 max = 2000000; /* ECI */
2074 } else {
2075 min = 2400;
2076 max = 921600; /* SCI */
2077 }
2078 break;
2079 case CP210X_PARTNUM_CP2102N_QFN28:
2080 case CP210X_PARTNUM_CP2102N_QFN24:
2081 case CP210X_PARTNUM_CP2102N_QFN20:
2082 use_actual_rate = true;
2083 max = 3000000;
2084 break;
2085 default:
2086 max = 2000000;
2087 break;
2088 }
2089
2090 priv->min_speed = min;
2091 priv->max_speed = max;
2092 priv->use_actual_rate = use_actual_rate;
2093 }
2094
cp2102_determine_quirks(struct usb_serial * serial)2095 static void cp2102_determine_quirks(struct usb_serial *serial)
2096 {
2097 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2098 u8 *buf;
2099 int ret;
2100
2101 buf = kmalloc(2, GFP_KERNEL);
2102 if (!buf)
2103 return;
2104 /*
2105 * Some (possibly counterfeit) CP2102 do not support event-insertion
2106 * mode and respond differently to malformed vendor requests.
2107 * Specifically, they return one instead of two bytes when sent a
2108 * two-byte part-number request.
2109 */
2110 ret = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2111 CP210X_VENDOR_SPECIFIC, REQTYPE_DEVICE_TO_HOST,
2112 CP210X_GET_PARTNUM, 0, buf, 2, USB_CTRL_GET_TIMEOUT);
2113 if (ret == 1) {
2114 dev_dbg(&serial->interface->dev,
2115 "device does not support event-insertion mode\n");
2116 priv->no_event_mode = true;
2117 }
2118
2119 kfree(buf);
2120 }
2121
cp210x_get_fw_version(struct usb_serial * serial,u16 value)2122 static int cp210x_get_fw_version(struct usb_serial *serial, u16 value)
2123 {
2124 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2125 u8 ver[3];
2126 int ret;
2127
2128 ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, value,
2129 ver, sizeof(ver));
2130 if (ret)
2131 return ret;
2132
2133 dev_dbg(&serial->interface->dev, "%s - %d.%d.%d\n", __func__,
2134 ver[0], ver[1], ver[2]);
2135
2136 priv->fw_version = ver[0] << 16 | ver[1] << 8 | ver[2];
2137
2138 return 0;
2139 }
2140
cp210x_determine_type(struct usb_serial * serial)2141 static void cp210x_determine_type(struct usb_serial *serial)
2142 {
2143 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2144 int ret;
2145
2146 ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
2147 CP210X_GET_PARTNUM, &priv->partnum,
2148 sizeof(priv->partnum));
2149 if (ret < 0) {
2150 dev_warn(&serial->interface->dev,
2151 "querying part number failed\n");
2152 priv->partnum = CP210X_PARTNUM_UNKNOWN;
2153 return;
2154 }
2155
2156 dev_dbg(&serial->interface->dev, "partnum = 0x%02x\n", priv->partnum);
2157
2158 switch (priv->partnum) {
2159 case CP210X_PARTNUM_CP2102:
2160 cp2102_determine_quirks(serial);
2161 break;
2162 case CP210X_PARTNUM_CP2105:
2163 case CP210X_PARTNUM_CP2108:
2164 cp210x_get_fw_version(serial, CP210X_GET_FW_VER);
2165 break;
2166 case CP210X_PARTNUM_CP2102N_QFN28:
2167 case CP210X_PARTNUM_CP2102N_QFN24:
2168 case CP210X_PARTNUM_CP2102N_QFN20:
2169 ret = cp210x_get_fw_version(serial, CP210X_GET_FW_VER_2N);
2170 if (ret)
2171 break;
2172 if (priv->fw_version <= 0x10004)
2173 priv->no_flow_control = true;
2174 break;
2175 default:
2176 break;
2177 }
2178 }
2179
cp210x_attach(struct usb_serial * serial)2180 static int cp210x_attach(struct usb_serial *serial)
2181 {
2182 int result;
2183 struct cp210x_serial_private *priv;
2184
2185 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2186 if (!priv)
2187 return -ENOMEM;
2188
2189 usb_set_serial_data(serial, priv);
2190
2191 cp210x_determine_type(serial);
2192 cp210x_init_max_speed(serial);
2193
2194 result = cp210x_gpio_init(serial);
2195 if (result < 0) {
2196 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n",
2197 result);
2198 }
2199
2200 return 0;
2201 }
2202
cp210x_disconnect(struct usb_serial * serial)2203 static void cp210x_disconnect(struct usb_serial *serial)
2204 {
2205 cp210x_gpio_remove(serial);
2206 }
2207
cp210x_release(struct usb_serial * serial)2208 static void cp210x_release(struct usb_serial *serial)
2209 {
2210 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2211
2212 cp210x_gpio_remove(serial);
2213
2214 kfree(priv);
2215 }
2216
2217 module_usb_serial_driver(serial_drivers, id_table);
2218
2219 MODULE_DESCRIPTION(DRIVER_DESC);
2220 MODULE_LICENSE("GPL v2");
2221