1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Silicon Laboratories CP210x USB to RS232 serial adaptor driver
4 *
5 * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
6 *
7 * Support to set flow control line levels using TIOCMGET and TIOCMSET
8 * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow
9 * control thanks to Munir Nassar nassarmu@real-time.com
10 *
11 */
12
13 #include <linux/kernel.h>
14 #include <linux/errno.h>
15 #include <linux/slab.h>
16 #include <linux/tty.h>
17 #include <linux/tty_flip.h>
18 #include <linux/module.h>
19 #include <linux/moduleparam.h>
20 #include <linux/usb.h>
21 #include <linux/uaccess.h>
22 #include <linux/usb/serial.h>
23 #include <linux/gpio/driver.h>
24 #include <linux/bitops.h>
25 #include <linux/mutex.h>
26
27 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
28
29 /*
30 * Function Prototypes
31 */
32 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
33 static void cp210x_close(struct usb_serial_port *);
34 static void cp210x_get_termios(struct tty_struct *, struct usb_serial_port *);
35 static void cp210x_get_termios_port(struct usb_serial_port *port,
36 tcflag_t *cflagp, unsigned int *baudp);
37 static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *,
38 struct ktermios *);
39 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
40 struct ktermios*);
41 static bool cp210x_tx_empty(struct usb_serial_port *port);
42 static int cp210x_tiocmget(struct tty_struct *);
43 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
44 static int cp210x_tiocmset_port(struct usb_serial_port *port,
45 unsigned int, unsigned int);
46 static void cp210x_break_ctl(struct tty_struct *, int);
47 static int cp210x_attach(struct usb_serial *);
48 static void cp210x_disconnect(struct usb_serial *);
49 static void cp210x_release(struct usb_serial *);
50 static int cp210x_port_probe(struct usb_serial_port *);
51 static int cp210x_port_remove(struct usb_serial_port *);
52 static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
53 static void cp210x_process_read_urb(struct urb *urb);
54 static void cp210x_enable_event_mode(struct usb_serial_port *port);
55 static void cp210x_disable_event_mode(struct usb_serial_port *port);
56
57 static const struct usb_device_id id_table[] = {
58 { USB_DEVICE(0x0404, 0x034C) }, /* NCR Retail IO Box */
59 { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */
60 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
61 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
62 { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
63 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
64 { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */
65 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
66 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
67 { USB_DEVICE(0x0908, 0x0070) }, /* Siemens SCALANCE LPE-9000 USB Serial Console */
68 { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */
69 { USB_DEVICE(0x0988, 0x0578) }, /* Teraoka AD2000 */
70 { USB_DEVICE(0x0B00, 0x3070) }, /* Ingenico 3070 */
71 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
72 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
73 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
74 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
75 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
76 { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */
77 { USB_DEVICE(0x106F, 0x0003) }, /* CPI / Money Controls Bulk Coin Recycler */
78 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
79 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
80 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
81 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
82 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
83 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
84 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
85 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
86 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
87 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
88 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
89 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
90 { USB_DEVICE(0x10C4, 0x8056) }, /* Lorenz Messtechnik devices */
91 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
92 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
93 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
94 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
95 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
96 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
97 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
98 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
99 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
100 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
101 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
102 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
103 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
104 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
105 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
106 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
107 { USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */
108 { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */
109 { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */
110 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
111 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
112 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
113 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
114 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
115 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
116 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
117 { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */
118 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
119 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
120 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
121 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
122 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
123 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
124 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
125 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */
126 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
127 { USB_DEVICE(0x10C4, 0x82AA) }, /* Silicon Labs IFS-USB-DATACABLE used with Quint UPS */
128 { USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */
129 { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */
130 { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */
131 { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */
132 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
133 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
134 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
135 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
136 { USB_DEVICE(0x10C4, 0x83AA) }, /* Mark-10 Digital Force Gauge */
137 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
138 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
139 { USB_DEVICE(0x10C4, 0x8414) }, /* Decagon USB Cable Adapter */
140 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
141 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
142 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */
143 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
144 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
145 { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */
146 { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */
147 { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */
148 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
149 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
150 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
151 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
152 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
153 { USB_DEVICE(0x10C4, 0x87ED) }, /* IMST USB-Stick for Smart Meter */
154 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
155 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
156 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
157 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
158 { USB_DEVICE(0x10C4, 0x88D8) }, /* Acuity Brands nLight Air Adapter */
159 { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */
160 { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */
161 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
162 { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */
163 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
164 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
165 { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */
166 { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */
167 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
168 { USB_DEVICE(0x10C4, 0x8A5B) }, /* CEL EM3588 ZigBee USB Stick */
169 { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */
170 { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */
171 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
172 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
173 { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */
174 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
175 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
176 { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */
177 { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */
178 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
179 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
180 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
181 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
182 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
183 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
184 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
185 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
186 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
187 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
188 { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */
189 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
190 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
191 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
192 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
193 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
194 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
195 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
196 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
197 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
198 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
199 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
200 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
201 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
202 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
203 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
204 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
205 { USB_DEVICE(0x17A8, 0x0011) }, /* Kamstrup 444 MHz RF sniffer */
206 { USB_DEVICE(0x17A8, 0x0013) }, /* Kamstrup 870 MHz RF sniffer */
207 { USB_DEVICE(0x17A8, 0x0101) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Int Ant) */
208 { USB_DEVICE(0x17A8, 0x0102) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Ext Ant) */
209 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
210 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
211 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
212 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
213 { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */
214 { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */
215 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
216 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
217 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
218 { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */
219 { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */
220 { USB_DEVICE(0x1901, 0x0197) }, /* GE CS1000 M.2 Key E serial interface */
221 { USB_DEVICE(0x1901, 0x0198) }, /* GE CS1000 Display serial interface */
222 { USB_DEVICE(0x199B, 0xBA30) }, /* LORD WSDA-200-USB */
223 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
224 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
225 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
226 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
227 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
228 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
229 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
230 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
231 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
232 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
233 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
234 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
235 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
236 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
237 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
238 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
239 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
240 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
241 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
242 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
243 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
244 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
245 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
246 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
247 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
248 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
249 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
250 { USB_DEVICE(0x2184, 0x0030) }, /* GW Instek GDM-834x Digital Multimeter */
251 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
252 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
253 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
254 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
255 { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */
256 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
257 { } /* Terminating Entry */
258 };
259
260 MODULE_DEVICE_TABLE(usb, id_table);
261
262 struct cp210x_serial_private {
263 #ifdef CONFIG_GPIOLIB
264 struct gpio_chip gc;
265 bool gpio_registered;
266 u8 gpio_pushpull;
267 u8 gpio_altfunc;
268 u8 gpio_input;
269 #endif
270 u8 partnum;
271 speed_t min_speed;
272 speed_t max_speed;
273 bool use_actual_rate;
274 bool no_event_mode;
275 };
276
277 enum cp210x_event_state {
278 ES_DATA,
279 ES_ESCAPE,
280 ES_LSR,
281 ES_LSR_DATA_0,
282 ES_LSR_DATA_1,
283 ES_MSR
284 };
285
286 struct cp210x_port_private {
287 u8 bInterfaceNumber;
288 bool has_swapped_line_ctl;
289 bool event_mode;
290 enum cp210x_event_state event_state;
291 u8 lsr;
292 };
293
294 static struct usb_serial_driver cp210x_device = {
295 .driver = {
296 .owner = THIS_MODULE,
297 .name = "cp210x",
298 },
299 .id_table = id_table,
300 .num_ports = 1,
301 .bulk_in_size = 256,
302 .bulk_out_size = 256,
303 .open = cp210x_open,
304 .close = cp210x_close,
305 .break_ctl = cp210x_break_ctl,
306 .set_termios = cp210x_set_termios,
307 .tx_empty = cp210x_tx_empty,
308 .throttle = usb_serial_generic_throttle,
309 .unthrottle = usb_serial_generic_unthrottle,
310 .tiocmget = cp210x_tiocmget,
311 .tiocmset = cp210x_tiocmset,
312 .get_icount = usb_serial_generic_get_icount,
313 .attach = cp210x_attach,
314 .disconnect = cp210x_disconnect,
315 .release = cp210x_release,
316 .port_probe = cp210x_port_probe,
317 .port_remove = cp210x_port_remove,
318 .dtr_rts = cp210x_dtr_rts,
319 .process_read_urb = cp210x_process_read_urb,
320 };
321
322 static struct usb_serial_driver * const serial_drivers[] = {
323 &cp210x_device, NULL
324 };
325
326 /* Config request types */
327 #define REQTYPE_HOST_TO_INTERFACE 0x41
328 #define REQTYPE_INTERFACE_TO_HOST 0xc1
329 #define REQTYPE_HOST_TO_DEVICE 0x40
330 #define REQTYPE_DEVICE_TO_HOST 0xc0
331
332 /* Config request codes */
333 #define CP210X_IFC_ENABLE 0x00
334 #define CP210X_SET_BAUDDIV 0x01
335 #define CP210X_GET_BAUDDIV 0x02
336 #define CP210X_SET_LINE_CTL 0x03
337 #define CP210X_GET_LINE_CTL 0x04
338 #define CP210X_SET_BREAK 0x05
339 #define CP210X_IMM_CHAR 0x06
340 #define CP210X_SET_MHS 0x07
341 #define CP210X_GET_MDMSTS 0x08
342 #define CP210X_SET_XON 0x09
343 #define CP210X_SET_XOFF 0x0A
344 #define CP210X_SET_EVENTMASK 0x0B
345 #define CP210X_GET_EVENTMASK 0x0C
346 #define CP210X_SET_CHAR 0x0D
347 #define CP210X_GET_CHARS 0x0E
348 #define CP210X_GET_PROPS 0x0F
349 #define CP210X_GET_COMM_STATUS 0x10
350 #define CP210X_RESET 0x11
351 #define CP210X_PURGE 0x12
352 #define CP210X_SET_FLOW 0x13
353 #define CP210X_GET_FLOW 0x14
354 #define CP210X_EMBED_EVENTS 0x15
355 #define CP210X_GET_EVENTSTATE 0x16
356 #define CP210X_SET_CHARS 0x19
357 #define CP210X_GET_BAUDRATE 0x1D
358 #define CP210X_SET_BAUDRATE 0x1E
359 #define CP210X_VENDOR_SPECIFIC 0xFF
360
361 /* CP210X_IFC_ENABLE */
362 #define UART_ENABLE 0x0001
363 #define UART_DISABLE 0x0000
364
365 /* CP210X_(SET|GET)_BAUDDIV */
366 #define BAUD_RATE_GEN_FREQ 0x384000
367
368 /* CP210X_(SET|GET)_LINE_CTL */
369 #define BITS_DATA_MASK 0X0f00
370 #define BITS_DATA_5 0X0500
371 #define BITS_DATA_6 0X0600
372 #define BITS_DATA_7 0X0700
373 #define BITS_DATA_8 0X0800
374 #define BITS_DATA_9 0X0900
375
376 #define BITS_PARITY_MASK 0x00f0
377 #define BITS_PARITY_NONE 0x0000
378 #define BITS_PARITY_ODD 0x0010
379 #define BITS_PARITY_EVEN 0x0020
380 #define BITS_PARITY_MARK 0x0030
381 #define BITS_PARITY_SPACE 0x0040
382
383 #define BITS_STOP_MASK 0x000f
384 #define BITS_STOP_1 0x0000
385 #define BITS_STOP_1_5 0x0001
386 #define BITS_STOP_2 0x0002
387
388 /* CP210X_SET_BREAK */
389 #define BREAK_ON 0x0001
390 #define BREAK_OFF 0x0000
391
392 /* CP210X_(SET_MHS|GET_MDMSTS) */
393 #define CONTROL_DTR 0x0001
394 #define CONTROL_RTS 0x0002
395 #define CONTROL_CTS 0x0010
396 #define CONTROL_DSR 0x0020
397 #define CONTROL_RING 0x0040
398 #define CONTROL_DCD 0x0080
399 #define CONTROL_WRITE_DTR 0x0100
400 #define CONTROL_WRITE_RTS 0x0200
401
402 /* CP210X_VENDOR_SPECIFIC values */
403 #define CP210X_READ_2NCONFIG 0x000E
404 #define CP210X_READ_LATCH 0x00C2
405 #define CP210X_GET_PARTNUM 0x370B
406 #define CP210X_GET_PORTCONFIG 0x370C
407 #define CP210X_GET_DEVICEMODE 0x3711
408 #define CP210X_WRITE_LATCH 0x37E1
409
410 /* Part number definitions */
411 #define CP210X_PARTNUM_CP2101 0x01
412 #define CP210X_PARTNUM_CP2102 0x02
413 #define CP210X_PARTNUM_CP2103 0x03
414 #define CP210X_PARTNUM_CP2104 0x04
415 #define CP210X_PARTNUM_CP2105 0x05
416 #define CP210X_PARTNUM_CP2108 0x08
417 #define CP210X_PARTNUM_CP2102N_QFN28 0x20
418 #define CP210X_PARTNUM_CP2102N_QFN24 0x21
419 #define CP210X_PARTNUM_CP2102N_QFN20 0x22
420 #define CP210X_PARTNUM_UNKNOWN 0xFF
421
422 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
423 struct cp210x_comm_status {
424 __le32 ulErrors;
425 __le32 ulHoldReasons;
426 __le32 ulAmountInInQueue;
427 __le32 ulAmountInOutQueue;
428 u8 bEofReceived;
429 u8 bWaitForImmediate;
430 u8 bReserved;
431 } __packed;
432
433 /*
434 * CP210X_PURGE - 16 bits passed in wValue of USB request.
435 * SiLabs app note AN571 gives a strange description of the 4 bits:
436 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
437 * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
438 */
439 #define PURGE_ALL 0x000f
440
441 /* CP210X_EMBED_EVENTS */
442 #define CP210X_ESCCHAR 0xec
443
444 #define CP210X_LSR_OVERRUN BIT(1)
445 #define CP210X_LSR_PARITY BIT(2)
446 #define CP210X_LSR_FRAME BIT(3)
447 #define CP210X_LSR_BREAK BIT(4)
448
449
450 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
451 struct cp210x_flow_ctl {
452 __le32 ulControlHandshake;
453 __le32 ulFlowReplace;
454 __le32 ulXonLimit;
455 __le32 ulXoffLimit;
456 };
457
458 /* cp210x_flow_ctl::ulControlHandshake */
459 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0)
460 #define CP210X_SERIAL_DTR_SHIFT(_mode) (_mode)
461 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3)
462 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4)
463 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5)
464 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6)
465
466 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */
467 #define CP210X_SERIAL_DTR_INACTIVE 0
468 #define CP210X_SERIAL_DTR_ACTIVE 1
469 #define CP210X_SERIAL_DTR_FLOW_CTL 2
470
471 /* cp210x_flow_ctl::ulFlowReplace */
472 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0)
473 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1)
474 #define CP210X_SERIAL_ERROR_CHAR BIT(2)
475 #define CP210X_SERIAL_NULL_STRIPPING BIT(3)
476 #define CP210X_SERIAL_BREAK_CHAR BIT(4)
477 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6)
478 #define CP210X_SERIAL_RTS_SHIFT(_mode) (_mode << 6)
479 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31)
480
481 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */
482 #define CP210X_SERIAL_RTS_INACTIVE 0
483 #define CP210X_SERIAL_RTS_ACTIVE 1
484 #define CP210X_SERIAL_RTS_FLOW_CTL 2
485
486 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
487 struct cp210x_pin_mode {
488 u8 eci;
489 u8 sci;
490 };
491
492 #define CP210X_PIN_MODE_MODEM 0
493 #define CP210X_PIN_MODE_GPIO BIT(0)
494
495 /*
496 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes
497 * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes.
498 */
499 struct cp210x_dual_port_config {
500 __le16 gpio_mode;
501 u8 __pad0[2];
502 __le16 reset_state;
503 u8 __pad1[4];
504 __le16 suspend_state;
505 u8 sci_cfg;
506 u8 eci_cfg;
507 u8 device_cfg;
508 } __packed;
509
510 /*
511 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes
512 * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes.
513 */
514 struct cp210x_single_port_config {
515 __le16 gpio_mode;
516 u8 __pad0[2];
517 __le16 reset_state;
518 u8 __pad1[4];
519 __le16 suspend_state;
520 u8 device_cfg;
521 } __packed;
522
523 /* GPIO modes */
524 #define CP210X_SCI_GPIO_MODE_OFFSET 9
525 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9)
526
527 #define CP210X_ECI_GPIO_MODE_OFFSET 2
528 #define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2)
529
530 #define CP210X_GPIO_MODE_OFFSET 8
531 #define CP210X_GPIO_MODE_MASK GENMASK(11, 8)
532
533 /* CP2105 port configuration values */
534 #define CP2105_GPIO0_TXLED_MODE BIT(0)
535 #define CP2105_GPIO1_RXLED_MODE BIT(1)
536 #define CP2105_GPIO1_RS485_MODE BIT(2)
537
538 /* CP2104 port configuration values */
539 #define CP2104_GPIO0_TXLED_MODE BIT(0)
540 #define CP2104_GPIO1_RXLED_MODE BIT(1)
541 #define CP2104_GPIO2_RS485_MODE BIT(2)
542
543 /* CP2102N configuration array indices */
544 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX 2
545 #define CP210X_2NCONFIG_GPIO_MODE_IDX 581
546 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587
547 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600
548
549 /* CP2102N QFN20 port configuration values */
550 #define CP2102N_QFN20_GPIO2_TXLED_MODE BIT(2)
551 #define CP2102N_QFN20_GPIO3_RXLED_MODE BIT(3)
552 #define CP2102N_QFN20_GPIO1_RS485_MODE BIT(4)
553 #define CP2102N_QFN20_GPIO0_CLK_MODE BIT(6)
554
555 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */
556 struct cp210x_gpio_write {
557 u8 mask;
558 u8 state;
559 };
560
561 /*
562 * Helper to get interface number when we only have struct usb_serial.
563 */
cp210x_interface_num(struct usb_serial *serial)564 static u8 cp210x_interface_num(struct usb_serial *serial)
565 {
566 struct usb_host_interface *cur_altsetting;
567
568 cur_altsetting = serial->interface->cur_altsetting;
569
570 return cur_altsetting->desc.bInterfaceNumber;
571 }
572
573 /*
574 * Reads a variable-sized block of CP210X_ registers, identified by req.
575 * Returns data into buf in native USB byte order.
576 */
cp210x_read_reg_block(struct usb_serial_port *port, u8 req, void *buf, int bufsize)577 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
578 void *buf, int bufsize)
579 {
580 struct usb_serial *serial = port->serial;
581 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
582 void *dmabuf;
583 int result;
584
585 dmabuf = kmalloc(bufsize, GFP_KERNEL);
586 if (!dmabuf) {
587 /*
588 * FIXME Some callers don't bother to check for error,
589 * at least give them consistent junk until they are fixed
590 */
591 memset(buf, 0, bufsize);
592 return -ENOMEM;
593 }
594
595 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
596 req, REQTYPE_INTERFACE_TO_HOST, 0,
597 port_priv->bInterfaceNumber, dmabuf, bufsize,
598 USB_CTRL_SET_TIMEOUT);
599 if (result == bufsize) {
600 memcpy(buf, dmabuf, bufsize);
601 result = 0;
602 } else {
603 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
604 req, bufsize, result);
605 if (result >= 0)
606 result = -EIO;
607
608 /*
609 * FIXME Some callers don't bother to check for error,
610 * at least give them consistent junk until they are fixed
611 */
612 memset(buf, 0, bufsize);
613 }
614
615 kfree(dmabuf);
616
617 return result;
618 }
619
620 /*
621 * Reads any 32-bit CP210X_ register identified by req.
622 */
cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val)623 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val)
624 {
625 __le32 le32_val;
626 int err;
627
628 err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val));
629 if (err) {
630 /*
631 * FIXME Some callers don't bother to check for error,
632 * at least give them consistent junk until they are fixed
633 */
634 *val = 0;
635 return err;
636 }
637
638 *val = le32_to_cpu(le32_val);
639
640 return 0;
641 }
642
643 /*
644 * Reads any 16-bit CP210X_ register identified by req.
645 */
cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val)646 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val)
647 {
648 __le16 le16_val;
649 int err;
650
651 err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val));
652 if (err)
653 return err;
654
655 *val = le16_to_cpu(le16_val);
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 void *dmabuf;
676 int result;
677
678 dmabuf = kmalloc(bufsize, GFP_KERNEL);
679 if (!dmabuf)
680 return -ENOMEM;
681
682 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
683 CP210X_VENDOR_SPECIFIC, type, val,
684 cp210x_interface_num(serial), dmabuf, bufsize,
685 USB_CTRL_GET_TIMEOUT);
686 if (result == bufsize) {
687 memcpy(buf, dmabuf, bufsize);
688 result = 0;
689 } else {
690 dev_err(&serial->interface->dev,
691 "failed to get vendor val 0x%04x size %d: %d\n", val,
692 bufsize, result);
693 if (result >= 0)
694 result = -EIO;
695 }
696
697 kfree(dmabuf);
698
699 return result;
700 }
701
702 /*
703 * Writes any 16-bit CP210X_ register (req) whose value is passed
704 * entirely in the wValue field of the USB request.
705 */
cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)706 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
707 {
708 struct usb_serial *serial = port->serial;
709 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
710 int result;
711
712 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
713 req, REQTYPE_HOST_TO_INTERFACE, val,
714 port_priv->bInterfaceNumber, NULL, 0,
715 USB_CTRL_SET_TIMEOUT);
716 if (result < 0) {
717 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
718 req, result);
719 }
720
721 return result;
722 }
723
724 /*
725 * Writes a variable-sized block of CP210X_ registers, identified by req.
726 * Data in buf must be in native USB byte order.
727 */
cp210x_write_reg_block(struct usb_serial_port *port, u8 req, void *buf, int bufsize)728 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
729 void *buf, int bufsize)
730 {
731 struct usb_serial *serial = port->serial;
732 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
733 void *dmabuf;
734 int result;
735
736 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
737 if (!dmabuf)
738 return -ENOMEM;
739
740 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
741 req, REQTYPE_HOST_TO_INTERFACE, 0,
742 port_priv->bInterfaceNumber, dmabuf, bufsize,
743 USB_CTRL_SET_TIMEOUT);
744
745 kfree(dmabuf);
746
747 if (result == bufsize) {
748 result = 0;
749 } else {
750 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
751 req, bufsize, result);
752 if (result >= 0)
753 result = -EIO;
754 }
755
756 return result;
757 }
758
759 /*
760 * Writes any 32-bit CP210X_ register identified by req.
761 */
cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)762 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
763 {
764 __le32 le32_val;
765
766 le32_val = cpu_to_le32(val);
767
768 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
769 }
770
771 #ifdef CONFIG_GPIOLIB
772 /*
773 * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
774 * Data in buf must be in native USB byte order.
775 */
cp210x_write_vendor_block(struct usb_serial *serial, u8 type, u16 val, void *buf, int bufsize)776 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
777 u16 val, void *buf, int bufsize)
778 {
779 void *dmabuf;
780 int result;
781
782 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
783 if (!dmabuf)
784 return -ENOMEM;
785
786 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
787 CP210X_VENDOR_SPECIFIC, type, val,
788 cp210x_interface_num(serial), dmabuf, bufsize,
789 USB_CTRL_SET_TIMEOUT);
790
791 kfree(dmabuf);
792
793 if (result == bufsize) {
794 result = 0;
795 } else {
796 dev_err(&serial->interface->dev,
797 "failed to set vendor val 0x%04x size %d: %d\n", val,
798 bufsize, result);
799 if (result >= 0)
800 result = -EIO;
801 }
802
803 return result;
804 }
805 #endif
806
807 /*
808 * Detect CP2108 GET_LINE_CTL bug and activate workaround.
809 * Write a known good value 0x800, read it back.
810 * If it comes back swapped the bug is detected.
811 * Preserve the original register value.
812 */
cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)813 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
814 {
815 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
816 u16 line_ctl_save;
817 u16 line_ctl_test;
818 int err;
819
820 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save);
821 if (err)
822 return err;
823
824 err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800);
825 if (err)
826 return err;
827
828 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test);
829 if (err)
830 return err;
831
832 if (line_ctl_test == 8) {
833 port_priv->has_swapped_line_ctl = true;
834 line_ctl_save = swab16(line_ctl_save);
835 }
836
837 return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save);
838 }
839
840 /*
841 * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL)
842 * to workaround cp2108 bug and get correct value.
843 */
cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl)844 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl)
845 {
846 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
847 int err;
848
849 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl);
850 if (err)
851 return err;
852
853 /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
854 if (port_priv->has_swapped_line_ctl)
855 *ctl = swab16(*ctl);
856
857 return 0;
858 }
859
cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)860 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
861 {
862 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
863 int result;
864
865 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
866 if (result) {
867 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
868 return result;
869 }
870
871 /* Configure the termios structure */
872 cp210x_get_termios(tty, port);
873
874 if (tty) {
875 /* The baud rate must be initialised on cp2104 */
876 cp210x_change_speed(tty, port, NULL);
877
878 if (I_INPCK(tty))
879 cp210x_enable_event_mode(port);
880 }
881
882 result = usb_serial_generic_open(tty, port);
883 if (result)
884 goto err_disable;
885
886 return 0;
887
888 err_disable:
889 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
890 port_priv->event_mode = false;
891
892 return result;
893 }
894
cp210x_close(struct usb_serial_port *port)895 static void cp210x_close(struct usb_serial_port *port)
896 {
897 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
898
899 usb_serial_generic_close(port);
900
901 /* Clear both queues; cp2108 needs this to avoid an occasional hang */
902 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
903
904 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
905
906 /* Disabling the interface disables event-insertion mode. */
907 port_priv->event_mode = false;
908 }
909
cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag)910 static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag)
911 {
912 if (lsr & CP210X_LSR_BREAK) {
913 port->icount.brk++;
914 *flag = TTY_BREAK;
915 } else if (lsr & CP210X_LSR_PARITY) {
916 port->icount.parity++;
917 *flag = TTY_PARITY;
918 } else if (lsr & CP210X_LSR_FRAME) {
919 port->icount.frame++;
920 *flag = TTY_FRAME;
921 }
922
923 if (lsr & CP210X_LSR_OVERRUN) {
924 port->icount.overrun++;
925 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
926 }
927 }
928
cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag)929 static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag)
930 {
931 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
932
933 switch (port_priv->event_state) {
934 case ES_DATA:
935 if (*ch == CP210X_ESCCHAR) {
936 port_priv->event_state = ES_ESCAPE;
937 break;
938 }
939 return false;
940 case ES_ESCAPE:
941 switch (*ch) {
942 case 0:
943 dev_dbg(&port->dev, "%s - escape char\n", __func__);
944 *ch = CP210X_ESCCHAR;
945 port_priv->event_state = ES_DATA;
946 return false;
947 case 1:
948 port_priv->event_state = ES_LSR_DATA_0;
949 break;
950 case 2:
951 port_priv->event_state = ES_LSR;
952 break;
953 case 3:
954 port_priv->event_state = ES_MSR;
955 break;
956 default:
957 dev_err(&port->dev, "malformed event 0x%02x\n", *ch);
958 port_priv->event_state = ES_DATA;
959 break;
960 }
961 break;
962 case ES_LSR_DATA_0:
963 port_priv->lsr = *ch;
964 port_priv->event_state = ES_LSR_DATA_1;
965 break;
966 case ES_LSR_DATA_1:
967 dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n",
968 __func__, port_priv->lsr, *ch);
969 cp210x_process_lsr(port, port_priv->lsr, flag);
970 port_priv->event_state = ES_DATA;
971 return false;
972 case ES_LSR:
973 dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch);
974 port_priv->lsr = *ch;
975 cp210x_process_lsr(port, port_priv->lsr, flag);
976 port_priv->event_state = ES_DATA;
977 break;
978 case ES_MSR:
979 dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch);
980 /* unimplemented */
981 port_priv->event_state = ES_DATA;
982 break;
983 }
984
985 return true;
986 }
987
cp210x_process_read_urb(struct urb *urb)988 static void cp210x_process_read_urb(struct urb *urb)
989 {
990 struct usb_serial_port *port = urb->context;
991 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
992 unsigned char *ch = urb->transfer_buffer;
993 char flag;
994 int i;
995
996 if (!urb->actual_length)
997 return;
998
999 if (port_priv->event_mode) {
1000 for (i = 0; i < urb->actual_length; i++, ch++) {
1001 flag = TTY_NORMAL;
1002
1003 if (cp210x_process_char(port, ch, &flag))
1004 continue;
1005
1006 tty_insert_flip_char(&port->port, *ch, flag);
1007 }
1008 } else {
1009 tty_insert_flip_string(&port->port, ch, urb->actual_length);
1010 }
1011 tty_flip_buffer_push(&port->port);
1012 }
1013
1014 /*
1015 * Read how many bytes are waiting in the TX queue.
1016 */
cp210x_get_tx_queue_byte_count(struct usb_serial_port *port, u32 *count)1017 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
1018 u32 *count)
1019 {
1020 struct usb_serial *serial = port->serial;
1021 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1022 struct cp210x_comm_status *sts;
1023 int result;
1024
1025 sts = kmalloc(sizeof(*sts), GFP_KERNEL);
1026 if (!sts)
1027 return -ENOMEM;
1028
1029 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
1030 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
1031 0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
1032 USB_CTRL_GET_TIMEOUT);
1033 if (result == sizeof(*sts)) {
1034 *count = le32_to_cpu(sts->ulAmountInOutQueue);
1035 result = 0;
1036 } else {
1037 dev_err(&port->dev, "failed to get comm status: %d\n", result);
1038 if (result >= 0)
1039 result = -EIO;
1040 }
1041
1042 kfree(sts);
1043
1044 return result;
1045 }
1046
cp210x_tx_empty(struct usb_serial_port *port)1047 static bool cp210x_tx_empty(struct usb_serial_port *port)
1048 {
1049 int err;
1050 u32 count;
1051
1052 err = cp210x_get_tx_queue_byte_count(port, &count);
1053 if (err)
1054 return true;
1055
1056 return !count;
1057 }
1058
1059 /*
1060 * cp210x_get_termios
1061 * Reads the baud rate, data bits, parity, stop bits and flow control mode
1062 * from the device, corrects any unsupported values, and configures the
1063 * termios structure to reflect the state of the device
1064 */
cp210x_get_termios(struct tty_struct *tty, struct usb_serial_port *port)1065 static void cp210x_get_termios(struct tty_struct *tty,
1066 struct usb_serial_port *port)
1067 {
1068 unsigned int baud;
1069
1070 if (tty) {
1071 cp210x_get_termios_port(tty->driver_data,
1072 &tty->termios.c_cflag, &baud);
1073 tty_encode_baud_rate(tty, baud, baud);
1074 } else {
1075 tcflag_t cflag;
1076 cflag = 0;
1077 cp210x_get_termios_port(port, &cflag, &baud);
1078 }
1079 }
1080
1081 /*
1082 * cp210x_get_termios_port
1083 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
1084 */
cp210x_get_termios_port(struct usb_serial_port *port, tcflag_t *cflagp, unsigned int *baudp)1085 static void cp210x_get_termios_port(struct usb_serial_port *port,
1086 tcflag_t *cflagp, unsigned int *baudp)
1087 {
1088 struct device *dev = &port->dev;
1089 tcflag_t cflag;
1090 struct cp210x_flow_ctl flow_ctl;
1091 u32 baud;
1092 u16 bits;
1093 u32 ctl_hs;
1094 u32 flow_repl;
1095
1096 cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud);
1097
1098 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
1099 *baudp = baud;
1100
1101 cflag = *cflagp;
1102
1103 cp210x_get_line_ctl(port, &bits);
1104 cflag &= ~CSIZE;
1105 switch (bits & BITS_DATA_MASK) {
1106 case BITS_DATA_5:
1107 dev_dbg(dev, "%s - data bits = 5\n", __func__);
1108 cflag |= CS5;
1109 break;
1110 case BITS_DATA_6:
1111 dev_dbg(dev, "%s - data bits = 6\n", __func__);
1112 cflag |= CS6;
1113 break;
1114 case BITS_DATA_7:
1115 dev_dbg(dev, "%s - data bits = 7\n", __func__);
1116 cflag |= CS7;
1117 break;
1118 case BITS_DATA_8:
1119 dev_dbg(dev, "%s - data bits = 8\n", __func__);
1120 cflag |= CS8;
1121 break;
1122 case BITS_DATA_9:
1123 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
1124 cflag |= CS8;
1125 bits &= ~BITS_DATA_MASK;
1126 bits |= BITS_DATA_8;
1127 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1128 break;
1129 default:
1130 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
1131 cflag |= CS8;
1132 bits &= ~BITS_DATA_MASK;
1133 bits |= BITS_DATA_8;
1134 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1135 break;
1136 }
1137
1138 switch (bits & BITS_PARITY_MASK) {
1139 case BITS_PARITY_NONE:
1140 dev_dbg(dev, "%s - parity = NONE\n", __func__);
1141 cflag &= ~PARENB;
1142 break;
1143 case BITS_PARITY_ODD:
1144 dev_dbg(dev, "%s - parity = ODD\n", __func__);
1145 cflag |= (PARENB|PARODD);
1146 break;
1147 case BITS_PARITY_EVEN:
1148 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
1149 cflag &= ~PARODD;
1150 cflag |= PARENB;
1151 break;
1152 case BITS_PARITY_MARK:
1153 dev_dbg(dev, "%s - parity = MARK\n", __func__);
1154 cflag |= (PARENB|PARODD|CMSPAR);
1155 break;
1156 case BITS_PARITY_SPACE:
1157 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
1158 cflag &= ~PARODD;
1159 cflag |= (PARENB|CMSPAR);
1160 break;
1161 default:
1162 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
1163 cflag &= ~PARENB;
1164 bits &= ~BITS_PARITY_MASK;
1165 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1166 break;
1167 }
1168
1169 cflag &= ~CSTOPB;
1170 switch (bits & BITS_STOP_MASK) {
1171 case BITS_STOP_1:
1172 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
1173 break;
1174 case BITS_STOP_1_5:
1175 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
1176 bits &= ~BITS_STOP_MASK;
1177 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1178 break;
1179 case BITS_STOP_2:
1180 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1181 cflag |= CSTOPB;
1182 break;
1183 default:
1184 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
1185 bits &= ~BITS_STOP_MASK;
1186 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1187 break;
1188 }
1189
1190 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1191 sizeof(flow_ctl));
1192 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1193 if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) {
1194 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1195 /*
1196 * When the port is closed, the CP210x hardware disables
1197 * auto-RTS and RTS is deasserted but it leaves auto-CTS when
1198 * in hardware flow control mode. When re-opening the port, if
1199 * auto-CTS is enabled on the cp210x, then auto-RTS must be
1200 * re-enabled in the driver.
1201 */
1202 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1203 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1204 flow_repl |= CP210X_SERIAL_RTS_SHIFT(CP210X_SERIAL_RTS_FLOW_CTL);
1205 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1206 cp210x_write_reg_block(port,
1207 CP210X_SET_FLOW,
1208 &flow_ctl,
1209 sizeof(flow_ctl));
1210
1211 cflag |= CRTSCTS;
1212 } else {
1213 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1214 cflag &= ~CRTSCTS;
1215 }
1216
1217 *cflagp = cflag;
1218 }
1219
1220 struct cp210x_rate {
1221 speed_t rate;
1222 speed_t high;
1223 };
1224
1225 static const struct cp210x_rate cp210x_an205_table1[] = {
1226 { 300, 300 },
1227 { 600, 600 },
1228 { 1200, 1200 },
1229 { 1800, 1800 },
1230 { 2400, 2400 },
1231 { 4000, 4000 },
1232 { 4800, 4803 },
1233 { 7200, 7207 },
1234 { 9600, 9612 },
1235 { 14400, 14428 },
1236 { 16000, 16062 },
1237 { 19200, 19250 },
1238 { 28800, 28912 },
1239 { 38400, 38601 },
1240 { 51200, 51558 },
1241 { 56000, 56280 },
1242 { 57600, 58053 },
1243 { 64000, 64111 },
1244 { 76800, 77608 },
1245 { 115200, 117028 },
1246 { 128000, 129347 },
1247 { 153600, 156868 },
1248 { 230400, 237832 },
1249 { 250000, 254234 },
1250 { 256000, 273066 },
1251 { 460800, 491520 },
1252 { 500000, 567138 },
1253 { 576000, 670254 },
1254 { 921600, UINT_MAX }
1255 };
1256
1257 /*
1258 * Quantises the baud rate as per AN205 Table 1
1259 */
cp210x_get_an205_rate(speed_t baud)1260 static speed_t cp210x_get_an205_rate(speed_t baud)
1261 {
1262 int i;
1263
1264 for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) {
1265 if (baud <= cp210x_an205_table1[i].high)
1266 break;
1267 }
1268
1269 return cp210x_an205_table1[i].rate;
1270 }
1271
cp210x_get_actual_rate(speed_t baud)1272 static speed_t cp210x_get_actual_rate(speed_t baud)
1273 {
1274 unsigned int prescale = 1;
1275 unsigned int div;
1276
1277 if (baud <= 365)
1278 prescale = 4;
1279
1280 div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud);
1281 baud = 48000000 / (2 * prescale * div);
1282
1283 return baud;
1284 }
1285
1286 /*
1287 * CP2101 supports the following baud rates:
1288 *
1289 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
1290 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
1291 *
1292 * CP2102 and CP2103 support the following additional rates:
1293 *
1294 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
1295 * 576000
1296 *
1297 * The device will map a requested rate to a supported one, but the result
1298 * of requests for rates greater than 1053257 is undefined (see AN205).
1299 *
1300 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
1301 * respectively, with an error less than 1%. The actual rates are determined
1302 * by
1303 *
1304 * div = round(freq / (2 x prescale x request))
1305 * actual = freq / (2 x prescale x div)
1306 *
1307 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1308 * or 1 otherwise.
1309 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1310 * otherwise.
1311 */
cp210x_change_speed(struct tty_struct *tty, struct usb_serial_port *port, struct ktermios *old_termios)1312 static void cp210x_change_speed(struct tty_struct *tty,
1313 struct usb_serial_port *port, struct ktermios *old_termios)
1314 {
1315 struct usb_serial *serial = port->serial;
1316 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1317 u32 baud;
1318
1319 /*
1320 * This maps the requested rate to the actual rate, a valid rate on
1321 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed].
1322 *
1323 * NOTE: B0 is not implemented.
1324 */
1325 baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed);
1326
1327 if (priv->use_actual_rate)
1328 baud = cp210x_get_actual_rate(baud);
1329 else if (baud < 1000000)
1330 baud = cp210x_get_an205_rate(baud);
1331
1332 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1333 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1334 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1335 if (old_termios)
1336 baud = old_termios->c_ospeed;
1337 else
1338 baud = 9600;
1339 }
1340
1341 tty_encode_baud_rate(tty, baud, baud);
1342 }
1343
cp210x_enable_event_mode(struct usb_serial_port *port)1344 static void cp210x_enable_event_mode(struct usb_serial_port *port)
1345 {
1346 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1347 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1348 int ret;
1349
1350 if (port_priv->event_mode)
1351 return;
1352
1353 if (priv->no_event_mode)
1354 return;
1355
1356 port_priv->event_state = ES_DATA;
1357 port_priv->event_mode = true;
1358
1359 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR);
1360 if (ret) {
1361 dev_err(&port->dev, "failed to enable events: %d\n", ret);
1362 port_priv->event_mode = false;
1363 }
1364 }
1365
cp210x_disable_event_mode(struct usb_serial_port *port)1366 static void cp210x_disable_event_mode(struct usb_serial_port *port)
1367 {
1368 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1369 int ret;
1370
1371 if (!port_priv->event_mode)
1372 return;
1373
1374 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0);
1375 if (ret) {
1376 dev_err(&port->dev, "failed to disable events: %d\n", ret);
1377 return;
1378 }
1379
1380 port_priv->event_mode = false;
1381 }
1382
cp210x_set_termios(struct tty_struct *tty, struct usb_serial_port *port, struct ktermios *old_termios)1383 static void cp210x_set_termios(struct tty_struct *tty,
1384 struct usb_serial_port *port, struct ktermios *old_termios)
1385 {
1386 struct device *dev = &port->dev;
1387 unsigned int cflag, old_cflag;
1388 u16 bits;
1389
1390 cflag = tty->termios.c_cflag;
1391 old_cflag = old_termios->c_cflag;
1392
1393 if (tty->termios.c_ospeed != old_termios->c_ospeed)
1394 cp210x_change_speed(tty, port, old_termios);
1395
1396 /* If the number of data bits is to be updated */
1397 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
1398 cp210x_get_line_ctl(port, &bits);
1399 bits &= ~BITS_DATA_MASK;
1400 switch (cflag & CSIZE) {
1401 case CS5:
1402 bits |= BITS_DATA_5;
1403 dev_dbg(dev, "%s - data bits = 5\n", __func__);
1404 break;
1405 case CS6:
1406 bits |= BITS_DATA_6;
1407 dev_dbg(dev, "%s - data bits = 6\n", __func__);
1408 break;
1409 case CS7:
1410 bits |= BITS_DATA_7;
1411 dev_dbg(dev, "%s - data bits = 7\n", __func__);
1412 break;
1413 case CS8:
1414 default:
1415 bits |= BITS_DATA_8;
1416 dev_dbg(dev, "%s - data bits = 8\n", __func__);
1417 break;
1418 }
1419 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1420 dev_dbg(dev, "Number of data bits requested not supported by device\n");
1421 }
1422
1423 if ((cflag & (PARENB|PARODD|CMSPAR)) !=
1424 (old_cflag & (PARENB|PARODD|CMSPAR))) {
1425 cp210x_get_line_ctl(port, &bits);
1426 bits &= ~BITS_PARITY_MASK;
1427 if (cflag & PARENB) {
1428 if (cflag & CMSPAR) {
1429 if (cflag & PARODD) {
1430 bits |= BITS_PARITY_MARK;
1431 dev_dbg(dev, "%s - parity = MARK\n", __func__);
1432 } else {
1433 bits |= BITS_PARITY_SPACE;
1434 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
1435 }
1436 } else {
1437 if (cflag & PARODD) {
1438 bits |= BITS_PARITY_ODD;
1439 dev_dbg(dev, "%s - parity = ODD\n", __func__);
1440 } else {
1441 bits |= BITS_PARITY_EVEN;
1442 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
1443 }
1444 }
1445 }
1446 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1447 dev_dbg(dev, "Parity mode not supported by device\n");
1448 }
1449
1450 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
1451 cp210x_get_line_ctl(port, &bits);
1452 bits &= ~BITS_STOP_MASK;
1453 if (cflag & CSTOPB) {
1454 bits |= BITS_STOP_2;
1455 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1456 } else {
1457 bits |= BITS_STOP_1;
1458 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
1459 }
1460 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1461 dev_dbg(dev, "Number of stop bits requested not supported by device\n");
1462 }
1463
1464 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
1465 struct cp210x_flow_ctl flow_ctl;
1466 u32 ctl_hs;
1467 u32 flow_repl;
1468
1469 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1470 sizeof(flow_ctl));
1471 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1472 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1473 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1474 __func__, ctl_hs, flow_repl);
1475
1476 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1477 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1478 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1479 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1480 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE);
1481 if (cflag & CRTSCTS) {
1482 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1483
1484 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1485 flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1486 CP210X_SERIAL_RTS_FLOW_CTL);
1487 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1488 } else {
1489 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1490
1491 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1492 flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1493 CP210X_SERIAL_RTS_ACTIVE);
1494 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1495 }
1496
1497 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1498 __func__, ctl_hs, flow_repl);
1499 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1500 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1501 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1502 sizeof(flow_ctl));
1503 }
1504
1505 /*
1506 * Enable event-insertion mode only if input parity checking is
1507 * enabled for now.
1508 */
1509 if (I_INPCK(tty))
1510 cp210x_enable_event_mode(port);
1511 else
1512 cp210x_disable_event_mode(port);
1513 }
1514
cp210x_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear)1515 static int cp210x_tiocmset(struct tty_struct *tty,
1516 unsigned int set, unsigned int clear)
1517 {
1518 struct usb_serial_port *port = tty->driver_data;
1519 return cp210x_tiocmset_port(port, set, clear);
1520 }
1521
cp210x_tiocmset_port(struct usb_serial_port *port, unsigned int set, unsigned int clear)1522 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1523 unsigned int set, unsigned int clear)
1524 {
1525 u16 control = 0;
1526
1527 if (set & TIOCM_RTS) {
1528 control |= CONTROL_RTS;
1529 control |= CONTROL_WRITE_RTS;
1530 }
1531 if (set & TIOCM_DTR) {
1532 control |= CONTROL_DTR;
1533 control |= CONTROL_WRITE_DTR;
1534 }
1535 if (clear & TIOCM_RTS) {
1536 control &= ~CONTROL_RTS;
1537 control |= CONTROL_WRITE_RTS;
1538 }
1539 if (clear & TIOCM_DTR) {
1540 control &= ~CONTROL_DTR;
1541 control |= CONTROL_WRITE_DTR;
1542 }
1543
1544 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
1545
1546 return cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1547 }
1548
cp210x_dtr_rts(struct usb_serial_port *p, int on)1549 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
1550 {
1551 if (on)
1552 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
1553 else
1554 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
1555 }
1556
cp210x_tiocmget(struct tty_struct *tty)1557 static int cp210x_tiocmget(struct tty_struct *tty)
1558 {
1559 struct usb_serial_port *port = tty->driver_data;
1560 u8 control;
1561 int result;
1562
1563 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1564 if (result)
1565 return result;
1566
1567 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1568 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1569 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1570 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1571 |((control & CONTROL_RING)? TIOCM_RI : 0)
1572 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
1573
1574 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
1575
1576 return result;
1577 }
1578
cp210x_break_ctl(struct tty_struct *tty, int break_state)1579 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1580 {
1581 struct usb_serial_port *port = tty->driver_data;
1582 u16 state;
1583
1584 if (break_state == 0)
1585 state = BREAK_OFF;
1586 else
1587 state = BREAK_ON;
1588 dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1589 state == BREAK_OFF ? "off" : "on");
1590 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1591 }
1592
1593 #ifdef CONFIG_GPIOLIB
cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset)1594 static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset)
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->gpio_altfunc & BIT(offset))
1600 return -ENODEV;
1601
1602 return 0;
1603 }
1604
cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)1605 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1606 {
1607 struct usb_serial *serial = gpiochip_get_data(gc);
1608 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1609 u8 req_type = REQTYPE_DEVICE_TO_HOST;
1610 int result;
1611 u8 buf;
1612
1613 if (priv->partnum == CP210X_PARTNUM_CP2105)
1614 req_type = REQTYPE_INTERFACE_TO_HOST;
1615
1616 result = usb_autopm_get_interface(serial->interface);
1617 if (result)
1618 return result;
1619
1620 result = cp210x_read_vendor_block(serial, req_type,
1621 CP210X_READ_LATCH, &buf, sizeof(buf));
1622 usb_autopm_put_interface(serial->interface);
1623 if (result < 0)
1624 return result;
1625
1626 return !!(buf & BIT(gpio));
1627 }
1628
cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)1629 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1630 {
1631 struct usb_serial *serial = gpiochip_get_data(gc);
1632 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1633 struct cp210x_gpio_write buf;
1634 int result;
1635
1636 if (value == 1)
1637 buf.state = BIT(gpio);
1638 else
1639 buf.state = 0;
1640
1641 buf.mask = BIT(gpio);
1642
1643 result = usb_autopm_get_interface(serial->interface);
1644 if (result)
1645 goto out;
1646
1647 if (priv->partnum == CP210X_PARTNUM_CP2105) {
1648 result = cp210x_write_vendor_block(serial,
1649 REQTYPE_HOST_TO_INTERFACE,
1650 CP210X_WRITE_LATCH, &buf,
1651 sizeof(buf));
1652 } else {
1653 u16 wIndex = buf.state << 8 | buf.mask;
1654
1655 result = usb_control_msg(serial->dev,
1656 usb_sndctrlpipe(serial->dev, 0),
1657 CP210X_VENDOR_SPECIFIC,
1658 REQTYPE_HOST_TO_DEVICE,
1659 CP210X_WRITE_LATCH,
1660 wIndex,
1661 NULL, 0, USB_CTRL_SET_TIMEOUT);
1662 }
1663
1664 usb_autopm_put_interface(serial->interface);
1665 out:
1666 if (result < 0) {
1667 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n",
1668 result);
1669 }
1670 }
1671
cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)1672 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1673 {
1674 struct usb_serial *serial = gpiochip_get_data(gc);
1675 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1676
1677 return priv->gpio_input & BIT(gpio);
1678 }
1679
cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)1680 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
1681 {
1682 struct usb_serial *serial = gpiochip_get_data(gc);
1683 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1684
1685 if (priv->partnum == CP210X_PARTNUM_CP2105) {
1686 /* hardware does not support an input mode */
1687 return -ENOTSUPP;
1688 }
1689
1690 /* push-pull pins cannot be changed to be inputs */
1691 if (priv->gpio_pushpull & BIT(gpio))
1692 return -EINVAL;
1693
1694 /* make sure to release pin if it is being driven low */
1695 cp210x_gpio_set(gc, gpio, 1);
1696
1697 priv->gpio_input |= BIT(gpio);
1698
1699 return 0;
1700 }
1701
cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio, int value)1702 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1703 int value)
1704 {
1705 struct usb_serial *serial = gpiochip_get_data(gc);
1706 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1707
1708 priv->gpio_input &= ~BIT(gpio);
1709 cp210x_gpio_set(gc, gpio, value);
1710
1711 return 0;
1712 }
1713
cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio, unsigned long config)1714 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
1715 unsigned long config)
1716 {
1717 struct usb_serial *serial = gpiochip_get_data(gc);
1718 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1719 enum pin_config_param param = pinconf_to_config_param(config);
1720
1721 /* Succeed only if in correct mode (this can't be set at runtime) */
1722 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) &&
1723 (priv->gpio_pushpull & BIT(gpio)))
1724 return 0;
1725
1726 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) &&
1727 !(priv->gpio_pushpull & BIT(gpio)))
1728 return 0;
1729
1730 return -ENOTSUPP;
1731 }
1732
1733 /*
1734 * This function is for configuring GPIO using shared pins, where other signals
1735 * are made unavailable by configuring the use of GPIO. This is believed to be
1736 * only applicable to the cp2105 at this point, the other devices supported by
1737 * this driver that provide GPIO do so in a way that does not impact other
1738 * signals and are thus expected to have very different initialisation.
1739 */
cp2105_gpioconf_init(struct usb_serial *serial)1740 static int cp2105_gpioconf_init(struct usb_serial *serial)
1741 {
1742 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1743 struct cp210x_pin_mode mode;
1744 struct cp210x_dual_port_config config;
1745 u8 intf_num = cp210x_interface_num(serial);
1746 u8 iface_config;
1747 int result;
1748
1749 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1750 CP210X_GET_DEVICEMODE, &mode,
1751 sizeof(mode));
1752 if (result < 0)
1753 return result;
1754
1755 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1756 CP210X_GET_PORTCONFIG, &config,
1757 sizeof(config));
1758 if (result < 0)
1759 return result;
1760
1761 /* 2 banks of GPIO - One for the pins taken from each serial port */
1762 if (intf_num == 0) {
1763 priv->gc.ngpio = 2;
1764
1765 if (mode.eci == CP210X_PIN_MODE_MODEM) {
1766 /* mark all GPIOs of this interface as reserved */
1767 priv->gpio_altfunc = 0xff;
1768 return 0;
1769 }
1770
1771 iface_config = config.eci_cfg;
1772 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1773 CP210X_ECI_GPIO_MODE_MASK) >>
1774 CP210X_ECI_GPIO_MODE_OFFSET);
1775 } else if (intf_num == 1) {
1776 priv->gc.ngpio = 3;
1777
1778 if (mode.sci == CP210X_PIN_MODE_MODEM) {
1779 /* mark all GPIOs of this interface as reserved */
1780 priv->gpio_altfunc = 0xff;
1781 return 0;
1782 }
1783
1784 iface_config = config.sci_cfg;
1785 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1786 CP210X_SCI_GPIO_MODE_MASK) >>
1787 CP210X_SCI_GPIO_MODE_OFFSET);
1788 } else {
1789 return -ENODEV;
1790 }
1791
1792 /* mark all pins which are not in GPIO mode */
1793 if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */
1794 priv->gpio_altfunc |= BIT(0);
1795 if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */
1796 CP2105_GPIO1_RS485_MODE))
1797 priv->gpio_altfunc |= BIT(1);
1798
1799 /* driver implementation for CP2105 only supports outputs */
1800 priv->gpio_input = 0;
1801
1802 return 0;
1803 }
1804
cp2104_gpioconf_init(struct usb_serial *serial)1805 static int cp2104_gpioconf_init(struct usb_serial *serial)
1806 {
1807 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1808 struct cp210x_single_port_config config;
1809 u8 iface_config;
1810 u8 gpio_latch;
1811 int result;
1812 u8 i;
1813
1814 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1815 CP210X_GET_PORTCONFIG, &config,
1816 sizeof(config));
1817 if (result < 0)
1818 return result;
1819
1820 priv->gc.ngpio = 4;
1821
1822 iface_config = config.device_cfg;
1823 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1824 CP210X_GPIO_MODE_MASK) >>
1825 CP210X_GPIO_MODE_OFFSET);
1826 gpio_latch = (u8)((le16_to_cpu(config.reset_state) &
1827 CP210X_GPIO_MODE_MASK) >>
1828 CP210X_GPIO_MODE_OFFSET);
1829
1830 /* mark all pins which are not in GPIO mode */
1831 if (iface_config & CP2104_GPIO0_TXLED_MODE) /* GPIO 0 */
1832 priv->gpio_altfunc |= BIT(0);
1833 if (iface_config & CP2104_GPIO1_RXLED_MODE) /* GPIO 1 */
1834 priv->gpio_altfunc |= BIT(1);
1835 if (iface_config & CP2104_GPIO2_RS485_MODE) /* GPIO 2 */
1836 priv->gpio_altfunc |= BIT(2);
1837
1838 /*
1839 * Like CP2102N, CP2104 has also no strict input and output pin
1840 * modes.
1841 * Do the same input mode emulation as CP2102N.
1842 */
1843 for (i = 0; i < priv->gc.ngpio; ++i) {
1844 /*
1845 * Set direction to "input" iff pin is open-drain and reset
1846 * value is 1.
1847 */
1848 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1849 priv->gpio_input |= BIT(i);
1850 }
1851
1852 return 0;
1853 }
1854
cp2102n_gpioconf_init(struct usb_serial *serial)1855 static int cp2102n_gpioconf_init(struct usb_serial *serial)
1856 {
1857 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1858 const u16 config_size = 0x02a6;
1859 u8 gpio_rst_latch;
1860 u8 config_version;
1861 u8 gpio_pushpull;
1862 u8 *config_buf;
1863 u8 gpio_latch;
1864 u8 gpio_ctrl;
1865 int result;
1866 u8 i;
1867
1868 /*
1869 * Retrieve device configuration from the device.
1870 * The array received contains all customization settings done at the
1871 * factory/manufacturer. Format of the array is documented at the
1872 * time of writing at:
1873 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa
1874 */
1875 config_buf = kmalloc(config_size, GFP_KERNEL);
1876 if (!config_buf)
1877 return -ENOMEM;
1878
1879 result = cp210x_read_vendor_block(serial,
1880 REQTYPE_DEVICE_TO_HOST,
1881 CP210X_READ_2NCONFIG,
1882 config_buf,
1883 config_size);
1884 if (result < 0) {
1885 kfree(config_buf);
1886 return result;
1887 }
1888
1889 config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX];
1890 gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX];
1891 gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX];
1892 gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX];
1893
1894 kfree(config_buf);
1895
1896 /* Make sure this is a config format we understand. */
1897 if (config_version != 0x01)
1898 return -ENOTSUPP;
1899
1900 priv->gc.ngpio = 4;
1901
1902 /*
1903 * Get default pin states after reset. Needed so we can determine
1904 * the direction of an open-drain pin.
1905 */
1906 gpio_latch = (gpio_rst_latch >> 3) & 0x0f;
1907
1908 /* 0 indicates open-drain mode, 1 is push-pull */
1909 priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f;
1910
1911 /* 0 indicates GPIO mode, 1 is alternate function */
1912 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN20) {
1913 /* QFN20 is special... */
1914 if (gpio_ctrl & CP2102N_QFN20_GPIO0_CLK_MODE) /* GPIO 0 */
1915 priv->gpio_altfunc |= BIT(0);
1916 if (gpio_ctrl & CP2102N_QFN20_GPIO1_RS485_MODE) /* GPIO 1 */
1917 priv->gpio_altfunc |= BIT(1);
1918 if (gpio_ctrl & CP2102N_QFN20_GPIO2_TXLED_MODE) /* GPIO 2 */
1919 priv->gpio_altfunc |= BIT(2);
1920 if (gpio_ctrl & CP2102N_QFN20_GPIO3_RXLED_MODE) /* GPIO 3 */
1921 priv->gpio_altfunc |= BIT(3);
1922 } else {
1923 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f;
1924 }
1925
1926 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) {
1927 /*
1928 * For the QFN28 package, GPIO4-6 are controlled by
1929 * the low three bits of the mode/latch fields.
1930 * Contrary to the document linked above, the bits for
1931 * the SUSPEND pins are elsewhere. No alternate
1932 * function is available for these pins.
1933 */
1934 priv->gc.ngpio = 7;
1935 gpio_latch |= (gpio_rst_latch & 7) << 4;
1936 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4;
1937 }
1938
1939 /*
1940 * The CP2102N does not strictly has input and output pin modes,
1941 * it only knows open-drain and push-pull modes which is set at
1942 * factory. An open-drain pin can function both as an
1943 * input or an output. We emulate input mode for open-drain pins
1944 * by making sure they are not driven low, and we do not allow
1945 * push-pull pins to be set as an input.
1946 */
1947 for (i = 0; i < priv->gc.ngpio; ++i) {
1948 /*
1949 * Set direction to "input" iff pin is open-drain and reset
1950 * value is 1.
1951 */
1952 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1953 priv->gpio_input |= BIT(i);
1954 }
1955
1956 return 0;
1957 }
1958
cp210x_gpio_init(struct usb_serial *serial)1959 static int cp210x_gpio_init(struct usb_serial *serial)
1960 {
1961 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1962 int result;
1963
1964 switch (priv->partnum) {
1965 case CP210X_PARTNUM_CP2104:
1966 result = cp2104_gpioconf_init(serial);
1967 break;
1968 case CP210X_PARTNUM_CP2105:
1969 result = cp2105_gpioconf_init(serial);
1970 break;
1971 case CP210X_PARTNUM_CP2102N_QFN28:
1972 case CP210X_PARTNUM_CP2102N_QFN24:
1973 case CP210X_PARTNUM_CP2102N_QFN20:
1974 result = cp2102n_gpioconf_init(serial);
1975 break;
1976 default:
1977 return 0;
1978 }
1979
1980 if (result < 0)
1981 return result;
1982
1983 priv->gc.label = "cp210x";
1984 priv->gc.request = cp210x_gpio_request;
1985 priv->gc.get_direction = cp210x_gpio_direction_get;
1986 priv->gc.direction_input = cp210x_gpio_direction_input;
1987 priv->gc.direction_output = cp210x_gpio_direction_output;
1988 priv->gc.get = cp210x_gpio_get;
1989 priv->gc.set = cp210x_gpio_set;
1990 priv->gc.set_config = cp210x_gpio_set_config;
1991 priv->gc.owner = THIS_MODULE;
1992 priv->gc.parent = &serial->interface->dev;
1993 priv->gc.base = -1;
1994 priv->gc.can_sleep = true;
1995
1996 result = gpiochip_add_data(&priv->gc, serial);
1997 if (!result)
1998 priv->gpio_registered = true;
1999
2000 return result;
2001 }
2002
cp210x_gpio_remove(struct usb_serial *serial)2003 static void cp210x_gpio_remove(struct usb_serial *serial)
2004 {
2005 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2006
2007 if (priv->gpio_registered) {
2008 gpiochip_remove(&priv->gc);
2009 priv->gpio_registered = false;
2010 }
2011 }
2012
2013 #else
2014
cp210x_gpio_init(struct usb_serial *serial)2015 static int cp210x_gpio_init(struct usb_serial *serial)
2016 {
2017 return 0;
2018 }
2019
cp210x_gpio_remove(struct usb_serial *serial)2020 static void cp210x_gpio_remove(struct usb_serial *serial)
2021 {
2022 /* Nothing to do */
2023 }
2024
2025 #endif
2026
cp210x_port_probe(struct usb_serial_port *port)2027 static int cp210x_port_probe(struct usb_serial_port *port)
2028 {
2029 struct usb_serial *serial = port->serial;
2030 struct cp210x_port_private *port_priv;
2031 int ret;
2032
2033 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
2034 if (!port_priv)
2035 return -ENOMEM;
2036
2037 port_priv->bInterfaceNumber = cp210x_interface_num(serial);
2038
2039 usb_set_serial_port_data(port, port_priv);
2040
2041 ret = cp210x_detect_swapped_line_ctl(port);
2042 if (ret) {
2043 kfree(port_priv);
2044 return ret;
2045 }
2046
2047 return 0;
2048 }
2049
cp210x_port_remove(struct usb_serial_port *port)2050 static int cp210x_port_remove(struct usb_serial_port *port)
2051 {
2052 struct cp210x_port_private *port_priv;
2053
2054 port_priv = usb_get_serial_port_data(port);
2055 kfree(port_priv);
2056
2057 return 0;
2058 }
2059
cp210x_init_max_speed(struct usb_serial *serial)2060 static void cp210x_init_max_speed(struct usb_serial *serial)
2061 {
2062 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2063 bool use_actual_rate = false;
2064 speed_t min = 300;
2065 speed_t max;
2066
2067 switch (priv->partnum) {
2068 case CP210X_PARTNUM_CP2101:
2069 max = 921600;
2070 break;
2071 case CP210X_PARTNUM_CP2102:
2072 case CP210X_PARTNUM_CP2103:
2073 max = 1000000;
2074 break;
2075 case CP210X_PARTNUM_CP2104:
2076 use_actual_rate = true;
2077 max = 2000000;
2078 break;
2079 case CP210X_PARTNUM_CP2108:
2080 max = 2000000;
2081 break;
2082 case CP210X_PARTNUM_CP2105:
2083 if (cp210x_interface_num(serial) == 0) {
2084 use_actual_rate = true;
2085 max = 2000000; /* ECI */
2086 } else {
2087 min = 2400;
2088 max = 921600; /* SCI */
2089 }
2090 break;
2091 case CP210X_PARTNUM_CP2102N_QFN28:
2092 case CP210X_PARTNUM_CP2102N_QFN24:
2093 case CP210X_PARTNUM_CP2102N_QFN20:
2094 use_actual_rate = true;
2095 max = 3000000;
2096 break;
2097 default:
2098 max = 2000000;
2099 break;
2100 }
2101
2102 priv->min_speed = min;
2103 priv->max_speed = max;
2104 priv->use_actual_rate = use_actual_rate;
2105 }
2106
cp2102_determine_quirks(struct usb_serial *serial)2107 static void cp2102_determine_quirks(struct usb_serial *serial)
2108 {
2109 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2110 u8 *buf;
2111 int ret;
2112
2113 buf = kmalloc(2, GFP_KERNEL);
2114 if (!buf)
2115 return;
2116 /*
2117 * Some (possibly counterfeit) CP2102 do not support event-insertion
2118 * mode and respond differently to malformed vendor requests.
2119 * Specifically, they return one instead of two bytes when sent a
2120 * two-byte part-number request.
2121 */
2122 ret = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2123 CP210X_VENDOR_SPECIFIC, REQTYPE_DEVICE_TO_HOST,
2124 CP210X_GET_PARTNUM, 0, buf, 2, USB_CTRL_GET_TIMEOUT);
2125 if (ret == 1) {
2126 dev_dbg(&serial->interface->dev,
2127 "device does not support event-insertion mode\n");
2128 priv->no_event_mode = true;
2129 }
2130
2131 kfree(buf);
2132 }
2133
cp210x_determine_quirks(struct usb_serial *serial)2134 static void cp210x_determine_quirks(struct usb_serial *serial)
2135 {
2136 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2137
2138 switch (priv->partnum) {
2139 case CP210X_PARTNUM_CP2102:
2140 cp2102_determine_quirks(serial);
2141 break;
2142 default:
2143 break;
2144 }
2145 }
2146
cp210x_attach(struct usb_serial *serial)2147 static int cp210x_attach(struct usb_serial *serial)
2148 {
2149 int result;
2150 struct cp210x_serial_private *priv;
2151
2152 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2153 if (!priv)
2154 return -ENOMEM;
2155
2156 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
2157 CP210X_GET_PARTNUM, &priv->partnum,
2158 sizeof(priv->partnum));
2159 if (result < 0) {
2160 dev_warn(&serial->interface->dev,
2161 "querying part number failed\n");
2162 priv->partnum = CP210X_PARTNUM_UNKNOWN;
2163 }
2164
2165 usb_set_serial_data(serial, priv);
2166
2167 cp210x_determine_quirks(serial);
2168 cp210x_init_max_speed(serial);
2169
2170 result = cp210x_gpio_init(serial);
2171 if (result < 0) {
2172 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n",
2173 result);
2174 }
2175
2176 return 0;
2177 }
2178
cp210x_disconnect(struct usb_serial *serial)2179 static void cp210x_disconnect(struct usb_serial *serial)
2180 {
2181 cp210x_gpio_remove(serial);
2182 }
2183
cp210x_release(struct usb_serial *serial)2184 static void cp210x_release(struct usb_serial *serial)
2185 {
2186 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2187
2188 cp210x_gpio_remove(serial);
2189
2190 kfree(priv);
2191 }
2192
2193 module_usb_serial_driver(serial_drivers, id_table);
2194
2195 MODULE_DESCRIPTION(DRIVER_DESC);
2196 MODULE_LICENSE("GPL v2");
2197