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, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */
128 { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */
129 { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */
130 { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */
131 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
132 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
133 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
134 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
135 { USB_DEVICE(0x10C4, 0x83AA) }, /* Mark-10 Digital Force Gauge */
136 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
137 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
138 { USB_DEVICE(0x10C4, 0x8414) }, /* Decagon USB Cable Adapter */
139 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
140 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
141 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */
142 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
143 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
144 { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */
145 { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */
146 { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */
147 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
148 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
149 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
150 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
151 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
152 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
153 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
154 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
155 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
156 { USB_DEVICE(0x10C4, 0x88D8) }, /* Acuity Brands nLight Air Adapter */
157 { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */
158 { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */
159 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
160 { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */
161 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
162 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
163 { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */
164 { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */
165 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
166 { USB_DEVICE(0x10C4, 0x8A5B) }, /* CEL EM3588 ZigBee USB Stick */
167 { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */
168 { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */
169 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
170 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
171 { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */
172 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
173 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
174 { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */
175 { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */
176 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
177 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
178 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
179 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
180 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
181 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
182 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
183 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
184 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
185 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
186 { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */
187 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
188 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
189 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
190 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
191 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
192 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
193 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
194 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
195 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
196 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
197 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
198 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
199 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
200 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
201 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
202 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
203 { USB_DEVICE(0x17A8, 0x0011) }, /* Kamstrup 444 MHz RF sniffer */
204 { USB_DEVICE(0x17A8, 0x0013) }, /* Kamstrup 870 MHz RF sniffer */
205 { USB_DEVICE(0x17A8, 0x0101) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Int Ant) */
206 { USB_DEVICE(0x17A8, 0x0102) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Ext Ant) */
207 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
208 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
209 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
210 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
211 { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */
212 { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */
213 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
214 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
215 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
216 { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */
217 { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */
218 { USB_DEVICE(0x1901, 0x0197) }, /* GE CS1000 M.2 Key E serial interface */
219 { USB_DEVICE(0x1901, 0x0198) }, /* GE CS1000 Display serial interface */
220 { USB_DEVICE(0x199B, 0xBA30) }, /* LORD WSDA-200-USB */
221 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
222 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
223 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
224 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
225 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
226 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
227 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
228 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
229 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
230 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
231 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
232 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
233 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
234 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
235 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
236 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
237 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
238 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
239 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
240 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
241 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
242 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
243 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
244 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
245 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
246 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
247 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
248 { USB_DEVICE(0x2184, 0x0030) }, /* GW Instek GDM-834x Digital Multimeter */
249 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
250 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
251 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
252 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
253 { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */
254 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
255 { } /* Terminating Entry */
256 };
257
258 MODULE_DEVICE_TABLE(usb, id_table);
259
260 struct cp210x_serial_private {
261 #ifdef CONFIG_GPIOLIB
262 struct gpio_chip gc;
263 bool gpio_registered;
264 u8 gpio_pushpull;
265 u8 gpio_altfunc;
266 u8 gpio_input;
267 #endif
268 u8 partnum;
269 speed_t min_speed;
270 speed_t max_speed;
271 bool use_actual_rate;
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 has_swapped_line_ctl;
287 bool event_mode;
288 enum cp210x_event_state event_state;
289 u8 lsr;
290 };
291
292 static struct usb_serial_driver cp210x_device = {
293 .driver = {
294 .owner = THIS_MODULE,
295 .name = "cp210x",
296 },
297 .id_table = id_table,
298 .num_ports = 1,
299 .bulk_in_size = 256,
300 .bulk_out_size = 256,
301 .open = cp210x_open,
302 .close = cp210x_close,
303 .break_ctl = cp210x_break_ctl,
304 .set_termios = cp210x_set_termios,
305 .tx_empty = cp210x_tx_empty,
306 .throttle = usb_serial_generic_throttle,
307 .unthrottle = usb_serial_generic_unthrottle,
308 .tiocmget = cp210x_tiocmget,
309 .tiocmset = cp210x_tiocmset,
310 .get_icount = usb_serial_generic_get_icount,
311 .attach = cp210x_attach,
312 .disconnect = cp210x_disconnect,
313 .release = cp210x_release,
314 .port_probe = cp210x_port_probe,
315 .port_remove = cp210x_port_remove,
316 .dtr_rts = cp210x_dtr_rts,
317 .process_read_urb = cp210x_process_read_urb,
318 };
319
320 static struct usb_serial_driver * const serial_drivers[] = {
321 &cp210x_device, NULL
322 };
323
324 /* Config request types */
325 #define REQTYPE_HOST_TO_INTERFACE 0x41
326 #define REQTYPE_INTERFACE_TO_HOST 0xc1
327 #define REQTYPE_HOST_TO_DEVICE 0x40
328 #define REQTYPE_DEVICE_TO_HOST 0xc0
329
330 /* Config request codes */
331 #define CP210X_IFC_ENABLE 0x00
332 #define CP210X_SET_BAUDDIV 0x01
333 #define CP210X_GET_BAUDDIV 0x02
334 #define CP210X_SET_LINE_CTL 0x03
335 #define CP210X_GET_LINE_CTL 0x04
336 #define CP210X_SET_BREAK 0x05
337 #define CP210X_IMM_CHAR 0x06
338 #define CP210X_SET_MHS 0x07
339 #define CP210X_GET_MDMSTS 0x08
340 #define CP210X_SET_XON 0x09
341 #define CP210X_SET_XOFF 0x0A
342 #define CP210X_SET_EVENTMASK 0x0B
343 #define CP210X_GET_EVENTMASK 0x0C
344 #define CP210X_SET_CHAR 0x0D
345 #define CP210X_GET_CHARS 0x0E
346 #define CP210X_GET_PROPS 0x0F
347 #define CP210X_GET_COMM_STATUS 0x10
348 #define CP210X_RESET 0x11
349 #define CP210X_PURGE 0x12
350 #define CP210X_SET_FLOW 0x13
351 #define CP210X_GET_FLOW 0x14
352 #define CP210X_EMBED_EVENTS 0x15
353 #define CP210X_GET_EVENTSTATE 0x16
354 #define CP210X_SET_CHARS 0x19
355 #define CP210X_GET_BAUDRATE 0x1D
356 #define CP210X_SET_BAUDRATE 0x1E
357 #define CP210X_VENDOR_SPECIFIC 0xFF
358
359 /* CP210X_IFC_ENABLE */
360 #define UART_ENABLE 0x0001
361 #define UART_DISABLE 0x0000
362
363 /* CP210X_(SET|GET)_BAUDDIV */
364 #define BAUD_RATE_GEN_FREQ 0x384000
365
366 /* CP210X_(SET|GET)_LINE_CTL */
367 #define BITS_DATA_MASK 0X0f00
368 #define BITS_DATA_5 0X0500
369 #define BITS_DATA_6 0X0600
370 #define BITS_DATA_7 0X0700
371 #define BITS_DATA_8 0X0800
372 #define BITS_DATA_9 0X0900
373
374 #define BITS_PARITY_MASK 0x00f0
375 #define BITS_PARITY_NONE 0x0000
376 #define BITS_PARITY_ODD 0x0010
377 #define BITS_PARITY_EVEN 0x0020
378 #define BITS_PARITY_MARK 0x0030
379 #define BITS_PARITY_SPACE 0x0040
380
381 #define BITS_STOP_MASK 0x000f
382 #define BITS_STOP_1 0x0000
383 #define BITS_STOP_1_5 0x0001
384 #define BITS_STOP_2 0x0002
385
386 /* CP210X_SET_BREAK */
387 #define BREAK_ON 0x0001
388 #define BREAK_OFF 0x0000
389
390 /* CP210X_(SET_MHS|GET_MDMSTS) */
391 #define CONTROL_DTR 0x0001
392 #define CONTROL_RTS 0x0002
393 #define CONTROL_CTS 0x0010
394 #define CONTROL_DSR 0x0020
395 #define CONTROL_RING 0x0040
396 #define CONTROL_DCD 0x0080
397 #define CONTROL_WRITE_DTR 0x0100
398 #define CONTROL_WRITE_RTS 0x0200
399
400 /* CP210X_VENDOR_SPECIFIC values */
401 #define CP210X_READ_2NCONFIG 0x000E
402 #define CP210X_READ_LATCH 0x00C2
403 #define CP210X_GET_PARTNUM 0x370B
404 #define CP210X_GET_PORTCONFIG 0x370C
405 #define CP210X_GET_DEVICEMODE 0x3711
406 #define CP210X_WRITE_LATCH 0x37E1
407
408 /* Part number definitions */
409 #define CP210X_PARTNUM_CP2101 0x01
410 #define CP210X_PARTNUM_CP2102 0x02
411 #define CP210X_PARTNUM_CP2103 0x03
412 #define CP210X_PARTNUM_CP2104 0x04
413 #define CP210X_PARTNUM_CP2105 0x05
414 #define CP210X_PARTNUM_CP2108 0x08
415 #define CP210X_PARTNUM_CP2102N_QFN28 0x20
416 #define CP210X_PARTNUM_CP2102N_QFN24 0x21
417 #define CP210X_PARTNUM_CP2102N_QFN20 0x22
418 #define CP210X_PARTNUM_UNKNOWN 0xFF
419
420 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
421 struct cp210x_comm_status {
422 __le32 ulErrors;
423 __le32 ulHoldReasons;
424 __le32 ulAmountInInQueue;
425 __le32 ulAmountInOutQueue;
426 u8 bEofReceived;
427 u8 bWaitForImmediate;
428 u8 bReserved;
429 } __packed;
430
431 /*
432 * CP210X_PURGE - 16 bits passed in wValue of USB request.
433 * SiLabs app note AN571 gives a strange description of the 4 bits:
434 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
435 * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
436 */
437 #define PURGE_ALL 0x000f
438
439 /* CP210X_EMBED_EVENTS */
440 #define CP210X_ESCCHAR 0xec
441
442 #define CP210X_LSR_OVERRUN BIT(1)
443 #define CP210X_LSR_PARITY BIT(2)
444 #define CP210X_LSR_FRAME BIT(3)
445 #define CP210X_LSR_BREAK BIT(4)
446
447
448 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
449 struct cp210x_flow_ctl {
450 __le32 ulControlHandshake;
451 __le32 ulFlowReplace;
452 __le32 ulXonLimit;
453 __le32 ulXoffLimit;
454 };
455
456 /* cp210x_flow_ctl::ulControlHandshake */
457 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0)
458 #define CP210X_SERIAL_DTR_SHIFT(_mode) (_mode)
459 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3)
460 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4)
461 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5)
462 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6)
463
464 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */
465 #define CP210X_SERIAL_DTR_INACTIVE 0
466 #define CP210X_SERIAL_DTR_ACTIVE 1
467 #define CP210X_SERIAL_DTR_FLOW_CTL 2
468
469 /* cp210x_flow_ctl::ulFlowReplace */
470 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0)
471 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1)
472 #define CP210X_SERIAL_ERROR_CHAR BIT(2)
473 #define CP210X_SERIAL_NULL_STRIPPING BIT(3)
474 #define CP210X_SERIAL_BREAK_CHAR BIT(4)
475 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6)
476 #define CP210X_SERIAL_RTS_SHIFT(_mode) (_mode << 6)
477 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31)
478
479 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */
480 #define CP210X_SERIAL_RTS_INACTIVE 0
481 #define CP210X_SERIAL_RTS_ACTIVE 1
482 #define CP210X_SERIAL_RTS_FLOW_CTL 2
483
484 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
485 struct cp210x_pin_mode {
486 u8 eci;
487 u8 sci;
488 };
489
490 #define CP210X_PIN_MODE_MODEM 0
491 #define CP210X_PIN_MODE_GPIO BIT(0)
492
493 /*
494 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes
495 * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes.
496 */
497 struct cp210x_dual_port_config {
498 __le16 gpio_mode;
499 u8 __pad0[2];
500 __le16 reset_state;
501 u8 __pad1[4];
502 __le16 suspend_state;
503 u8 sci_cfg;
504 u8 eci_cfg;
505 u8 device_cfg;
506 } __packed;
507
508 /*
509 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes
510 * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes.
511 */
512 struct cp210x_single_port_config {
513 __le16 gpio_mode;
514 u8 __pad0[2];
515 __le16 reset_state;
516 u8 __pad1[4];
517 __le16 suspend_state;
518 u8 device_cfg;
519 } __packed;
520
521 /* GPIO modes */
522 #define CP210X_SCI_GPIO_MODE_OFFSET 9
523 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9)
524
525 #define CP210X_ECI_GPIO_MODE_OFFSET 2
526 #define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2)
527
528 #define CP210X_GPIO_MODE_OFFSET 8
529 #define CP210X_GPIO_MODE_MASK GENMASK(11, 8)
530
531 /* CP2105 port configuration values */
532 #define CP2105_GPIO0_TXLED_MODE BIT(0)
533 #define CP2105_GPIO1_RXLED_MODE BIT(1)
534 #define CP2105_GPIO1_RS485_MODE BIT(2)
535
536 /* CP2104 port configuration values */
537 #define CP2104_GPIO0_TXLED_MODE BIT(0)
538 #define CP2104_GPIO1_RXLED_MODE BIT(1)
539 #define CP2104_GPIO2_RS485_MODE BIT(2)
540
541 /* CP2102N configuration array indices */
542 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX 2
543 #define CP210X_2NCONFIG_GPIO_MODE_IDX 581
544 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587
545 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600
546
547 /* CP2102N QFN20 port configuration values */
548 #define CP2102N_QFN20_GPIO2_TXLED_MODE BIT(2)
549 #define CP2102N_QFN20_GPIO3_RXLED_MODE BIT(3)
550 #define CP2102N_QFN20_GPIO1_RS485_MODE BIT(4)
551 #define CP2102N_QFN20_GPIO0_CLK_MODE BIT(6)
552
553 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */
554 struct cp210x_gpio_write {
555 u8 mask;
556 u8 state;
557 };
558
559 /*
560 * Helper to get interface number when we only have struct usb_serial.
561 */
cp210x_interface_num(struct usb_serial * serial)562 static u8 cp210x_interface_num(struct usb_serial *serial)
563 {
564 struct usb_host_interface *cur_altsetting;
565
566 cur_altsetting = serial->interface->cur_altsetting;
567
568 return cur_altsetting->desc.bInterfaceNumber;
569 }
570
571 /*
572 * Reads a variable-sized block of CP210X_ registers, identified by req.
573 * Returns data into buf in native USB byte order.
574 */
cp210x_read_reg_block(struct usb_serial_port * port,u8 req,void * buf,int bufsize)575 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
576 void *buf, int bufsize)
577 {
578 struct usb_serial *serial = port->serial;
579 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
580 void *dmabuf;
581 int result;
582
583 dmabuf = kmalloc(bufsize, GFP_KERNEL);
584 if (!dmabuf) {
585 /*
586 * FIXME Some callers don't bother to check for error,
587 * at least give them consistent junk until they are fixed
588 */
589 memset(buf, 0, bufsize);
590 return -ENOMEM;
591 }
592
593 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
594 req, REQTYPE_INTERFACE_TO_HOST, 0,
595 port_priv->bInterfaceNumber, dmabuf, bufsize,
596 USB_CTRL_SET_TIMEOUT);
597 if (result == bufsize) {
598 memcpy(buf, dmabuf, bufsize);
599 result = 0;
600 } else {
601 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
602 req, bufsize, result);
603 if (result >= 0)
604 result = -EIO;
605
606 /*
607 * FIXME Some callers don't bother to check for error,
608 * at least give them consistent junk until they are fixed
609 */
610 memset(buf, 0, bufsize);
611 }
612
613 kfree(dmabuf);
614
615 return result;
616 }
617
618 /*
619 * Reads any 32-bit CP210X_ register identified by req.
620 */
cp210x_read_u32_reg(struct usb_serial_port * port,u8 req,u32 * val)621 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val)
622 {
623 __le32 le32_val;
624 int err;
625
626 err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val));
627 if (err) {
628 /*
629 * FIXME Some callers don't bother to check for error,
630 * at least give them consistent junk until they are fixed
631 */
632 *val = 0;
633 return err;
634 }
635
636 *val = le32_to_cpu(le32_val);
637
638 return 0;
639 }
640
641 /*
642 * Reads any 16-bit CP210X_ register identified by req.
643 */
cp210x_read_u16_reg(struct usb_serial_port * port,u8 req,u16 * val)644 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val)
645 {
646 __le16 le16_val;
647 int err;
648
649 err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val));
650 if (err)
651 return err;
652
653 *val = le16_to_cpu(le16_val);
654
655 return 0;
656 }
657
658 /*
659 * Reads any 8-bit CP210X_ register identified by req.
660 */
cp210x_read_u8_reg(struct usb_serial_port * port,u8 req,u8 * val)661 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
662 {
663 return cp210x_read_reg_block(port, req, val, sizeof(*val));
664 }
665
666 /*
667 * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
668 * Returns data into buf in native USB byte order.
669 */
cp210x_read_vendor_block(struct usb_serial * serial,u8 type,u16 val,void * buf,int bufsize)670 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
671 void *buf, int bufsize)
672 {
673 void *dmabuf;
674 int result;
675
676 dmabuf = kmalloc(bufsize, GFP_KERNEL);
677 if (!dmabuf)
678 return -ENOMEM;
679
680 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
681 CP210X_VENDOR_SPECIFIC, type, val,
682 cp210x_interface_num(serial), dmabuf, bufsize,
683 USB_CTRL_GET_TIMEOUT);
684 if (result == bufsize) {
685 memcpy(buf, dmabuf, bufsize);
686 result = 0;
687 } else {
688 dev_err(&serial->interface->dev,
689 "failed to get vendor val 0x%04x size %d: %d\n", val,
690 bufsize, result);
691 if (result >= 0)
692 result = -EIO;
693 }
694
695 kfree(dmabuf);
696
697 return result;
698 }
699
700 /*
701 * Writes any 16-bit CP210X_ register (req) whose value is passed
702 * entirely in the wValue field of the USB request.
703 */
cp210x_write_u16_reg(struct usb_serial_port * port,u8 req,u16 val)704 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
705 {
706 struct usb_serial *serial = port->serial;
707 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
708 int result;
709
710 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
711 req, REQTYPE_HOST_TO_INTERFACE, val,
712 port_priv->bInterfaceNumber, NULL, 0,
713 USB_CTRL_SET_TIMEOUT);
714 if (result < 0) {
715 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
716 req, result);
717 }
718
719 return result;
720 }
721
722 /*
723 * Writes a variable-sized block of CP210X_ registers, identified by req.
724 * Data in buf must be in native USB byte order.
725 */
cp210x_write_reg_block(struct usb_serial_port * port,u8 req,void * buf,int bufsize)726 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
727 void *buf, int bufsize)
728 {
729 struct usb_serial *serial = port->serial;
730 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
731 void *dmabuf;
732 int result;
733
734 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
735 if (!dmabuf)
736 return -ENOMEM;
737
738 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
739 req, REQTYPE_HOST_TO_INTERFACE, 0,
740 port_priv->bInterfaceNumber, dmabuf, bufsize,
741 USB_CTRL_SET_TIMEOUT);
742
743 kfree(dmabuf);
744
745 if (result == bufsize) {
746 result = 0;
747 } else {
748 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
749 req, bufsize, result);
750 if (result >= 0)
751 result = -EIO;
752 }
753
754 return result;
755 }
756
757 /*
758 * Writes any 32-bit CP210X_ register identified by req.
759 */
cp210x_write_u32_reg(struct usb_serial_port * port,u8 req,u32 val)760 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
761 {
762 __le32 le32_val;
763
764 le32_val = cpu_to_le32(val);
765
766 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
767 }
768
769 #ifdef CONFIG_GPIOLIB
770 /*
771 * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
772 * Data in buf must be in native USB byte order.
773 */
cp210x_write_vendor_block(struct usb_serial * serial,u8 type,u16 val,void * buf,int bufsize)774 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
775 u16 val, void *buf, int bufsize)
776 {
777 void *dmabuf;
778 int result;
779
780 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
781 if (!dmabuf)
782 return -ENOMEM;
783
784 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
785 CP210X_VENDOR_SPECIFIC, type, val,
786 cp210x_interface_num(serial), dmabuf, bufsize,
787 USB_CTRL_SET_TIMEOUT);
788
789 kfree(dmabuf);
790
791 if (result == bufsize) {
792 result = 0;
793 } else {
794 dev_err(&serial->interface->dev,
795 "failed to set vendor val 0x%04x size %d: %d\n", val,
796 bufsize, result);
797 if (result >= 0)
798 result = -EIO;
799 }
800
801 return result;
802 }
803 #endif
804
805 /*
806 * Detect CP2108 GET_LINE_CTL bug and activate workaround.
807 * Write a known good value 0x800, read it back.
808 * If it comes back swapped the bug is detected.
809 * Preserve the original register value.
810 */
cp210x_detect_swapped_line_ctl(struct usb_serial_port * port)811 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
812 {
813 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
814 u16 line_ctl_save;
815 u16 line_ctl_test;
816 int err;
817
818 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save);
819 if (err)
820 return err;
821
822 err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800);
823 if (err)
824 return err;
825
826 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test);
827 if (err)
828 return err;
829
830 if (line_ctl_test == 8) {
831 port_priv->has_swapped_line_ctl = true;
832 line_ctl_save = swab16(line_ctl_save);
833 }
834
835 return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save);
836 }
837
838 /*
839 * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL)
840 * to workaround cp2108 bug and get correct value.
841 */
cp210x_get_line_ctl(struct usb_serial_port * port,u16 * ctl)842 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl)
843 {
844 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
845 int err;
846
847 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl);
848 if (err)
849 return err;
850
851 /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
852 if (port_priv->has_swapped_line_ctl)
853 *ctl = swab16(*ctl);
854
855 return 0;
856 }
857
cp210x_open(struct tty_struct * tty,struct usb_serial_port * port)858 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
859 {
860 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
861 int result;
862
863 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
864 if (result) {
865 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
866 return result;
867 }
868
869 /* Configure the termios structure */
870 cp210x_get_termios(tty, port);
871
872 if (tty) {
873 /* The baud rate must be initialised on cp2104 */
874 cp210x_change_speed(tty, port, NULL);
875
876 if (I_INPCK(tty))
877 cp210x_enable_event_mode(port);
878 }
879
880 result = usb_serial_generic_open(tty, port);
881 if (result)
882 goto err_disable;
883
884 return 0;
885
886 err_disable:
887 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
888 port_priv->event_mode = false;
889
890 return result;
891 }
892
cp210x_close(struct usb_serial_port * port)893 static void cp210x_close(struct usb_serial_port *port)
894 {
895 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
896
897 usb_serial_generic_close(port);
898
899 /* Clear both queues; cp2108 needs this to avoid an occasional hang */
900 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
901
902 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
903
904 /* Disabling the interface disables event-insertion mode. */
905 port_priv->event_mode = false;
906 }
907
cp210x_process_lsr(struct usb_serial_port * port,unsigned char lsr,char * flag)908 static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag)
909 {
910 if (lsr & CP210X_LSR_BREAK) {
911 port->icount.brk++;
912 *flag = TTY_BREAK;
913 } else if (lsr & CP210X_LSR_PARITY) {
914 port->icount.parity++;
915 *flag = TTY_PARITY;
916 } else if (lsr & CP210X_LSR_FRAME) {
917 port->icount.frame++;
918 *flag = TTY_FRAME;
919 }
920
921 if (lsr & CP210X_LSR_OVERRUN) {
922 port->icount.overrun++;
923 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
924 }
925 }
926
cp210x_process_char(struct usb_serial_port * port,unsigned char * ch,char * flag)927 static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag)
928 {
929 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
930
931 switch (port_priv->event_state) {
932 case ES_DATA:
933 if (*ch == CP210X_ESCCHAR) {
934 port_priv->event_state = ES_ESCAPE;
935 break;
936 }
937 return false;
938 case ES_ESCAPE:
939 switch (*ch) {
940 case 0:
941 dev_dbg(&port->dev, "%s - escape char\n", __func__);
942 *ch = CP210X_ESCCHAR;
943 port_priv->event_state = ES_DATA;
944 return false;
945 case 1:
946 port_priv->event_state = ES_LSR_DATA_0;
947 break;
948 case 2:
949 port_priv->event_state = ES_LSR;
950 break;
951 case 3:
952 port_priv->event_state = ES_MSR;
953 break;
954 default:
955 dev_err(&port->dev, "malformed event 0x%02x\n", *ch);
956 port_priv->event_state = ES_DATA;
957 break;
958 }
959 break;
960 case ES_LSR_DATA_0:
961 port_priv->lsr = *ch;
962 port_priv->event_state = ES_LSR_DATA_1;
963 break;
964 case ES_LSR_DATA_1:
965 dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n",
966 __func__, port_priv->lsr, *ch);
967 cp210x_process_lsr(port, port_priv->lsr, flag);
968 port_priv->event_state = ES_DATA;
969 return false;
970 case ES_LSR:
971 dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch);
972 port_priv->lsr = *ch;
973 cp210x_process_lsr(port, port_priv->lsr, flag);
974 port_priv->event_state = ES_DATA;
975 break;
976 case ES_MSR:
977 dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch);
978 /* unimplemented */
979 port_priv->event_state = ES_DATA;
980 break;
981 }
982
983 return true;
984 }
985
cp210x_process_read_urb(struct urb * urb)986 static void cp210x_process_read_urb(struct urb *urb)
987 {
988 struct usb_serial_port *port = urb->context;
989 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
990 unsigned char *ch = urb->transfer_buffer;
991 char flag;
992 int i;
993
994 if (!urb->actual_length)
995 return;
996
997 if (port_priv->event_mode) {
998 for (i = 0; i < urb->actual_length; i++, ch++) {
999 flag = TTY_NORMAL;
1000
1001 if (cp210x_process_char(port, ch, &flag))
1002 continue;
1003
1004 tty_insert_flip_char(&port->port, *ch, flag);
1005 }
1006 } else {
1007 tty_insert_flip_string(&port->port, ch, urb->actual_length);
1008 }
1009 tty_flip_buffer_push(&port->port);
1010 }
1011
1012 /*
1013 * Read how many bytes are waiting in the TX queue.
1014 */
cp210x_get_tx_queue_byte_count(struct usb_serial_port * port,u32 * count)1015 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
1016 u32 *count)
1017 {
1018 struct usb_serial *serial = port->serial;
1019 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1020 struct cp210x_comm_status *sts;
1021 int result;
1022
1023 sts = kmalloc(sizeof(*sts), GFP_KERNEL);
1024 if (!sts)
1025 return -ENOMEM;
1026
1027 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
1028 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
1029 0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
1030 USB_CTRL_GET_TIMEOUT);
1031 if (result == sizeof(*sts)) {
1032 *count = le32_to_cpu(sts->ulAmountInOutQueue);
1033 result = 0;
1034 } else {
1035 dev_err(&port->dev, "failed to get comm status: %d\n", result);
1036 if (result >= 0)
1037 result = -EIO;
1038 }
1039
1040 kfree(sts);
1041
1042 return result;
1043 }
1044
cp210x_tx_empty(struct usb_serial_port * port)1045 static bool cp210x_tx_empty(struct usb_serial_port *port)
1046 {
1047 int err;
1048 u32 count;
1049
1050 err = cp210x_get_tx_queue_byte_count(port, &count);
1051 if (err)
1052 return true;
1053
1054 return !count;
1055 }
1056
1057 /*
1058 * cp210x_get_termios
1059 * Reads the baud rate, data bits, parity, stop bits and flow control mode
1060 * from the device, corrects any unsupported values, and configures the
1061 * termios structure to reflect the state of the device
1062 */
cp210x_get_termios(struct tty_struct * tty,struct usb_serial_port * port)1063 static void cp210x_get_termios(struct tty_struct *tty,
1064 struct usb_serial_port *port)
1065 {
1066 unsigned int baud;
1067
1068 if (tty) {
1069 cp210x_get_termios_port(tty->driver_data,
1070 &tty->termios.c_cflag, &baud);
1071 tty_encode_baud_rate(tty, baud, baud);
1072 } else {
1073 tcflag_t cflag;
1074 cflag = 0;
1075 cp210x_get_termios_port(port, &cflag, &baud);
1076 }
1077 }
1078
1079 /*
1080 * cp210x_get_termios_port
1081 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
1082 */
cp210x_get_termios_port(struct usb_serial_port * port,tcflag_t * cflagp,unsigned int * baudp)1083 static void cp210x_get_termios_port(struct usb_serial_port *port,
1084 tcflag_t *cflagp, unsigned int *baudp)
1085 {
1086 struct device *dev = &port->dev;
1087 tcflag_t cflag;
1088 struct cp210x_flow_ctl flow_ctl;
1089 u32 baud;
1090 u16 bits;
1091 u32 ctl_hs;
1092 u32 flow_repl;
1093
1094 cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud);
1095
1096 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
1097 *baudp = baud;
1098
1099 cflag = *cflagp;
1100
1101 cp210x_get_line_ctl(port, &bits);
1102 cflag &= ~CSIZE;
1103 switch (bits & BITS_DATA_MASK) {
1104 case BITS_DATA_5:
1105 dev_dbg(dev, "%s - data bits = 5\n", __func__);
1106 cflag |= CS5;
1107 break;
1108 case BITS_DATA_6:
1109 dev_dbg(dev, "%s - data bits = 6\n", __func__);
1110 cflag |= CS6;
1111 break;
1112 case BITS_DATA_7:
1113 dev_dbg(dev, "%s - data bits = 7\n", __func__);
1114 cflag |= CS7;
1115 break;
1116 case BITS_DATA_8:
1117 dev_dbg(dev, "%s - data bits = 8\n", __func__);
1118 cflag |= CS8;
1119 break;
1120 case BITS_DATA_9:
1121 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
1122 cflag |= CS8;
1123 bits &= ~BITS_DATA_MASK;
1124 bits |= BITS_DATA_8;
1125 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1126 break;
1127 default:
1128 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
1129 cflag |= CS8;
1130 bits &= ~BITS_DATA_MASK;
1131 bits |= BITS_DATA_8;
1132 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1133 break;
1134 }
1135
1136 switch (bits & BITS_PARITY_MASK) {
1137 case BITS_PARITY_NONE:
1138 dev_dbg(dev, "%s - parity = NONE\n", __func__);
1139 cflag &= ~PARENB;
1140 break;
1141 case BITS_PARITY_ODD:
1142 dev_dbg(dev, "%s - parity = ODD\n", __func__);
1143 cflag |= (PARENB|PARODD);
1144 break;
1145 case BITS_PARITY_EVEN:
1146 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
1147 cflag &= ~PARODD;
1148 cflag |= PARENB;
1149 break;
1150 case BITS_PARITY_MARK:
1151 dev_dbg(dev, "%s - parity = MARK\n", __func__);
1152 cflag |= (PARENB|PARODD|CMSPAR);
1153 break;
1154 case BITS_PARITY_SPACE:
1155 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
1156 cflag &= ~PARODD;
1157 cflag |= (PARENB|CMSPAR);
1158 break;
1159 default:
1160 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
1161 cflag &= ~PARENB;
1162 bits &= ~BITS_PARITY_MASK;
1163 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1164 break;
1165 }
1166
1167 cflag &= ~CSTOPB;
1168 switch (bits & BITS_STOP_MASK) {
1169 case BITS_STOP_1:
1170 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
1171 break;
1172 case BITS_STOP_1_5:
1173 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
1174 bits &= ~BITS_STOP_MASK;
1175 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1176 break;
1177 case BITS_STOP_2:
1178 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1179 cflag |= CSTOPB;
1180 break;
1181 default:
1182 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
1183 bits &= ~BITS_STOP_MASK;
1184 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1185 break;
1186 }
1187
1188 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1189 sizeof(flow_ctl));
1190 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1191 if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) {
1192 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1193 /*
1194 * When the port is closed, the CP210x hardware disables
1195 * auto-RTS and RTS is deasserted but it leaves auto-CTS when
1196 * in hardware flow control mode. When re-opening the port, if
1197 * auto-CTS is enabled on the cp210x, then auto-RTS must be
1198 * re-enabled in the driver.
1199 */
1200 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1201 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1202 flow_repl |= CP210X_SERIAL_RTS_SHIFT(CP210X_SERIAL_RTS_FLOW_CTL);
1203 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1204 cp210x_write_reg_block(port,
1205 CP210X_SET_FLOW,
1206 &flow_ctl,
1207 sizeof(flow_ctl));
1208
1209 cflag |= CRTSCTS;
1210 } else {
1211 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1212 cflag &= ~CRTSCTS;
1213 }
1214
1215 *cflagp = cflag;
1216 }
1217
1218 struct cp210x_rate {
1219 speed_t rate;
1220 speed_t high;
1221 };
1222
1223 static const struct cp210x_rate cp210x_an205_table1[] = {
1224 { 300, 300 },
1225 { 600, 600 },
1226 { 1200, 1200 },
1227 { 1800, 1800 },
1228 { 2400, 2400 },
1229 { 4000, 4000 },
1230 { 4800, 4803 },
1231 { 7200, 7207 },
1232 { 9600, 9612 },
1233 { 14400, 14428 },
1234 { 16000, 16062 },
1235 { 19200, 19250 },
1236 { 28800, 28912 },
1237 { 38400, 38601 },
1238 { 51200, 51558 },
1239 { 56000, 56280 },
1240 { 57600, 58053 },
1241 { 64000, 64111 },
1242 { 76800, 77608 },
1243 { 115200, 117028 },
1244 { 128000, 129347 },
1245 { 153600, 156868 },
1246 { 230400, 237832 },
1247 { 250000, 254234 },
1248 { 256000, 273066 },
1249 { 460800, 491520 },
1250 { 500000, 567138 },
1251 { 576000, 670254 },
1252 { 921600, UINT_MAX }
1253 };
1254
1255 /*
1256 * Quantises the baud rate as per AN205 Table 1
1257 */
cp210x_get_an205_rate(speed_t baud)1258 static speed_t cp210x_get_an205_rate(speed_t baud)
1259 {
1260 int i;
1261
1262 for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) {
1263 if (baud <= cp210x_an205_table1[i].high)
1264 break;
1265 }
1266
1267 return cp210x_an205_table1[i].rate;
1268 }
1269
cp210x_get_actual_rate(speed_t baud)1270 static speed_t cp210x_get_actual_rate(speed_t baud)
1271 {
1272 unsigned int prescale = 1;
1273 unsigned int div;
1274
1275 if (baud <= 365)
1276 prescale = 4;
1277
1278 div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud);
1279 baud = 48000000 / (2 * prescale * div);
1280
1281 return baud;
1282 }
1283
1284 /*
1285 * CP2101 supports the following baud rates:
1286 *
1287 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
1288 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
1289 *
1290 * CP2102 and CP2103 support the following additional rates:
1291 *
1292 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
1293 * 576000
1294 *
1295 * The device will map a requested rate to a supported one, but the result
1296 * of requests for rates greater than 1053257 is undefined (see AN205).
1297 *
1298 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
1299 * respectively, with an error less than 1%. The actual rates are determined
1300 * by
1301 *
1302 * div = round(freq / (2 x prescale x request))
1303 * actual = freq / (2 x prescale x div)
1304 *
1305 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1306 * or 1 otherwise.
1307 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1308 * otherwise.
1309 */
cp210x_change_speed(struct tty_struct * tty,struct usb_serial_port * port,struct ktermios * old_termios)1310 static void cp210x_change_speed(struct tty_struct *tty,
1311 struct usb_serial_port *port, struct ktermios *old_termios)
1312 {
1313 struct usb_serial *serial = port->serial;
1314 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1315 u32 baud;
1316
1317 /*
1318 * This maps the requested rate to the actual rate, a valid rate on
1319 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed].
1320 *
1321 * NOTE: B0 is not implemented.
1322 */
1323 baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed);
1324
1325 if (priv->use_actual_rate)
1326 baud = cp210x_get_actual_rate(baud);
1327 else if (baud < 1000000)
1328 baud = cp210x_get_an205_rate(baud);
1329
1330 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1331 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1332 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1333 if (old_termios)
1334 baud = old_termios->c_ospeed;
1335 else
1336 baud = 9600;
1337 }
1338
1339 tty_encode_baud_rate(tty, baud, baud);
1340 }
1341
cp210x_enable_event_mode(struct usb_serial_port * port)1342 static void cp210x_enable_event_mode(struct usb_serial_port *port)
1343 {
1344 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1345 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1346 int ret;
1347
1348 if (port_priv->event_mode)
1349 return;
1350
1351 if (priv->no_event_mode)
1352 return;
1353
1354 port_priv->event_state = ES_DATA;
1355 port_priv->event_mode = true;
1356
1357 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR);
1358 if (ret) {
1359 dev_err(&port->dev, "failed to enable events: %d\n", ret);
1360 port_priv->event_mode = false;
1361 }
1362 }
1363
cp210x_disable_event_mode(struct usb_serial_port * port)1364 static void cp210x_disable_event_mode(struct usb_serial_port *port)
1365 {
1366 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1367 int ret;
1368
1369 if (!port_priv->event_mode)
1370 return;
1371
1372 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0);
1373 if (ret) {
1374 dev_err(&port->dev, "failed to disable events: %d\n", ret);
1375 return;
1376 }
1377
1378 port_priv->event_mode = false;
1379 }
1380
cp210x_set_termios(struct tty_struct * tty,struct usb_serial_port * port,struct ktermios * old_termios)1381 static void cp210x_set_termios(struct tty_struct *tty,
1382 struct usb_serial_port *port, struct ktermios *old_termios)
1383 {
1384 struct device *dev = &port->dev;
1385 unsigned int cflag, old_cflag;
1386 u16 bits;
1387
1388 cflag = tty->termios.c_cflag;
1389 old_cflag = old_termios->c_cflag;
1390
1391 if (tty->termios.c_ospeed != old_termios->c_ospeed)
1392 cp210x_change_speed(tty, port, old_termios);
1393
1394 /* If the number of data bits is to be updated */
1395 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
1396 cp210x_get_line_ctl(port, &bits);
1397 bits &= ~BITS_DATA_MASK;
1398 switch (cflag & CSIZE) {
1399 case CS5:
1400 bits |= BITS_DATA_5;
1401 dev_dbg(dev, "%s - data bits = 5\n", __func__);
1402 break;
1403 case CS6:
1404 bits |= BITS_DATA_6;
1405 dev_dbg(dev, "%s - data bits = 6\n", __func__);
1406 break;
1407 case CS7:
1408 bits |= BITS_DATA_7;
1409 dev_dbg(dev, "%s - data bits = 7\n", __func__);
1410 break;
1411 case CS8:
1412 default:
1413 bits |= BITS_DATA_8;
1414 dev_dbg(dev, "%s - data bits = 8\n", __func__);
1415 break;
1416 }
1417 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1418 dev_dbg(dev, "Number of data bits requested not supported by device\n");
1419 }
1420
1421 if ((cflag & (PARENB|PARODD|CMSPAR)) !=
1422 (old_cflag & (PARENB|PARODD|CMSPAR))) {
1423 cp210x_get_line_ctl(port, &bits);
1424 bits &= ~BITS_PARITY_MASK;
1425 if (cflag & PARENB) {
1426 if (cflag & CMSPAR) {
1427 if (cflag & PARODD) {
1428 bits |= BITS_PARITY_MARK;
1429 dev_dbg(dev, "%s - parity = MARK\n", __func__);
1430 } else {
1431 bits |= BITS_PARITY_SPACE;
1432 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
1433 }
1434 } else {
1435 if (cflag & PARODD) {
1436 bits |= BITS_PARITY_ODD;
1437 dev_dbg(dev, "%s - parity = ODD\n", __func__);
1438 } else {
1439 bits |= BITS_PARITY_EVEN;
1440 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
1441 }
1442 }
1443 }
1444 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1445 dev_dbg(dev, "Parity mode not supported by device\n");
1446 }
1447
1448 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
1449 cp210x_get_line_ctl(port, &bits);
1450 bits &= ~BITS_STOP_MASK;
1451 if (cflag & CSTOPB) {
1452 bits |= BITS_STOP_2;
1453 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1454 } else {
1455 bits |= BITS_STOP_1;
1456 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
1457 }
1458 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1459 dev_dbg(dev, "Number of stop bits requested not supported by device\n");
1460 }
1461
1462 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
1463 struct cp210x_flow_ctl flow_ctl;
1464 u32 ctl_hs;
1465 u32 flow_repl;
1466
1467 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1468 sizeof(flow_ctl));
1469 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1470 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1471 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1472 __func__, ctl_hs, flow_repl);
1473
1474 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1475 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1476 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1477 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1478 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE);
1479 if (cflag & CRTSCTS) {
1480 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1481
1482 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1483 flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1484 CP210X_SERIAL_RTS_FLOW_CTL);
1485 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1486 } else {
1487 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1488
1489 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1490 flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1491 CP210X_SERIAL_RTS_ACTIVE);
1492 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1493 }
1494
1495 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1496 __func__, ctl_hs, flow_repl);
1497 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1498 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1499 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1500 sizeof(flow_ctl));
1501 }
1502
1503 /*
1504 * Enable event-insertion mode only if input parity checking is
1505 * enabled for now.
1506 */
1507 if (I_INPCK(tty))
1508 cp210x_enable_event_mode(port);
1509 else
1510 cp210x_disable_event_mode(port);
1511 }
1512
cp210x_tiocmset(struct tty_struct * tty,unsigned int set,unsigned int clear)1513 static int cp210x_tiocmset(struct tty_struct *tty,
1514 unsigned int set, unsigned int clear)
1515 {
1516 struct usb_serial_port *port = tty->driver_data;
1517 return cp210x_tiocmset_port(port, set, clear);
1518 }
1519
cp210x_tiocmset_port(struct usb_serial_port * port,unsigned int set,unsigned int clear)1520 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1521 unsigned int set, unsigned int clear)
1522 {
1523 u16 control = 0;
1524
1525 if (set & TIOCM_RTS) {
1526 control |= CONTROL_RTS;
1527 control |= CONTROL_WRITE_RTS;
1528 }
1529 if (set & TIOCM_DTR) {
1530 control |= CONTROL_DTR;
1531 control |= CONTROL_WRITE_DTR;
1532 }
1533 if (clear & TIOCM_RTS) {
1534 control &= ~CONTROL_RTS;
1535 control |= CONTROL_WRITE_RTS;
1536 }
1537 if (clear & TIOCM_DTR) {
1538 control &= ~CONTROL_DTR;
1539 control |= CONTROL_WRITE_DTR;
1540 }
1541
1542 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
1543
1544 return cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1545 }
1546
cp210x_dtr_rts(struct usb_serial_port * p,int on)1547 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
1548 {
1549 if (on)
1550 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
1551 else
1552 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
1553 }
1554
cp210x_tiocmget(struct tty_struct * tty)1555 static int cp210x_tiocmget(struct tty_struct *tty)
1556 {
1557 struct usb_serial_port *port = tty->driver_data;
1558 u8 control;
1559 int result;
1560
1561 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1562 if (result)
1563 return result;
1564
1565 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1566 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1567 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1568 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1569 |((control & CONTROL_RING)? TIOCM_RI : 0)
1570 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
1571
1572 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
1573
1574 return result;
1575 }
1576
cp210x_break_ctl(struct tty_struct * tty,int break_state)1577 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1578 {
1579 struct usb_serial_port *port = tty->driver_data;
1580 u16 state;
1581
1582 if (break_state == 0)
1583 state = BREAK_OFF;
1584 else
1585 state = BREAK_ON;
1586 dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1587 state == BREAK_OFF ? "off" : "on");
1588 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1589 }
1590
1591 #ifdef CONFIG_GPIOLIB
cp210x_gpio_request(struct gpio_chip * gc,unsigned int offset)1592 static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset)
1593 {
1594 struct usb_serial *serial = gpiochip_get_data(gc);
1595 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1596
1597 if (priv->gpio_altfunc & BIT(offset))
1598 return -ENODEV;
1599
1600 return 0;
1601 }
1602
cp210x_gpio_get(struct gpio_chip * gc,unsigned int gpio)1603 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1604 {
1605 struct usb_serial *serial = gpiochip_get_data(gc);
1606 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1607 u8 req_type = REQTYPE_DEVICE_TO_HOST;
1608 int result;
1609 u8 buf;
1610
1611 if (priv->partnum == CP210X_PARTNUM_CP2105)
1612 req_type = REQTYPE_INTERFACE_TO_HOST;
1613
1614 result = usb_autopm_get_interface(serial->interface);
1615 if (result)
1616 return result;
1617
1618 result = cp210x_read_vendor_block(serial, req_type,
1619 CP210X_READ_LATCH, &buf, sizeof(buf));
1620 usb_autopm_put_interface(serial->interface);
1621 if (result < 0)
1622 return result;
1623
1624 return !!(buf & BIT(gpio));
1625 }
1626
cp210x_gpio_set(struct gpio_chip * gc,unsigned int gpio,int value)1627 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1628 {
1629 struct usb_serial *serial = gpiochip_get_data(gc);
1630 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1631 struct cp210x_gpio_write buf;
1632 int result;
1633
1634 if (value == 1)
1635 buf.state = BIT(gpio);
1636 else
1637 buf.state = 0;
1638
1639 buf.mask = BIT(gpio);
1640
1641 result = usb_autopm_get_interface(serial->interface);
1642 if (result)
1643 goto out;
1644
1645 if (priv->partnum == CP210X_PARTNUM_CP2105) {
1646 result = cp210x_write_vendor_block(serial,
1647 REQTYPE_HOST_TO_INTERFACE,
1648 CP210X_WRITE_LATCH, &buf,
1649 sizeof(buf));
1650 } else {
1651 u16 wIndex = buf.state << 8 | buf.mask;
1652
1653 result = usb_control_msg(serial->dev,
1654 usb_sndctrlpipe(serial->dev, 0),
1655 CP210X_VENDOR_SPECIFIC,
1656 REQTYPE_HOST_TO_DEVICE,
1657 CP210X_WRITE_LATCH,
1658 wIndex,
1659 NULL, 0, USB_CTRL_SET_TIMEOUT);
1660 }
1661
1662 usb_autopm_put_interface(serial->interface);
1663 out:
1664 if (result < 0) {
1665 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n",
1666 result);
1667 }
1668 }
1669
cp210x_gpio_direction_get(struct gpio_chip * gc,unsigned int gpio)1670 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1671 {
1672 struct usb_serial *serial = gpiochip_get_data(gc);
1673 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1674
1675 return priv->gpio_input & BIT(gpio);
1676 }
1677
cp210x_gpio_direction_input(struct gpio_chip * gc,unsigned int gpio)1678 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
1679 {
1680 struct usb_serial *serial = gpiochip_get_data(gc);
1681 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1682
1683 if (priv->partnum == CP210X_PARTNUM_CP2105) {
1684 /* hardware does not support an input mode */
1685 return -ENOTSUPP;
1686 }
1687
1688 /* push-pull pins cannot be changed to be inputs */
1689 if (priv->gpio_pushpull & BIT(gpio))
1690 return -EINVAL;
1691
1692 /* make sure to release pin if it is being driven low */
1693 cp210x_gpio_set(gc, gpio, 1);
1694
1695 priv->gpio_input |= BIT(gpio);
1696
1697 return 0;
1698 }
1699
cp210x_gpio_direction_output(struct gpio_chip * gc,unsigned int gpio,int value)1700 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1701 int value)
1702 {
1703 struct usb_serial *serial = gpiochip_get_data(gc);
1704 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1705
1706 priv->gpio_input &= ~BIT(gpio);
1707 cp210x_gpio_set(gc, gpio, value);
1708
1709 return 0;
1710 }
1711
cp210x_gpio_set_config(struct gpio_chip * gc,unsigned int gpio,unsigned long config)1712 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
1713 unsigned long config)
1714 {
1715 struct usb_serial *serial = gpiochip_get_data(gc);
1716 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1717 enum pin_config_param param = pinconf_to_config_param(config);
1718
1719 /* Succeed only if in correct mode (this can't be set at runtime) */
1720 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) &&
1721 (priv->gpio_pushpull & BIT(gpio)))
1722 return 0;
1723
1724 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) &&
1725 !(priv->gpio_pushpull & BIT(gpio)))
1726 return 0;
1727
1728 return -ENOTSUPP;
1729 }
1730
1731 /*
1732 * This function is for configuring GPIO using shared pins, where other signals
1733 * are made unavailable by configuring the use of GPIO. This is believed to be
1734 * only applicable to the cp2105 at this point, the other devices supported by
1735 * this driver that provide GPIO do so in a way that does not impact other
1736 * signals and are thus expected to have very different initialisation.
1737 */
cp2105_gpioconf_init(struct usb_serial * serial)1738 static int cp2105_gpioconf_init(struct usb_serial *serial)
1739 {
1740 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1741 struct cp210x_pin_mode mode;
1742 struct cp210x_dual_port_config config;
1743 u8 intf_num = cp210x_interface_num(serial);
1744 u8 iface_config;
1745 int result;
1746
1747 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1748 CP210X_GET_DEVICEMODE, &mode,
1749 sizeof(mode));
1750 if (result < 0)
1751 return result;
1752
1753 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1754 CP210X_GET_PORTCONFIG, &config,
1755 sizeof(config));
1756 if (result < 0)
1757 return result;
1758
1759 /* 2 banks of GPIO - One for the pins taken from each serial port */
1760 if (intf_num == 0) {
1761 priv->gc.ngpio = 2;
1762
1763 if (mode.eci == CP210X_PIN_MODE_MODEM) {
1764 /* mark all GPIOs of this interface as reserved */
1765 priv->gpio_altfunc = 0xff;
1766 return 0;
1767 }
1768
1769 iface_config = config.eci_cfg;
1770 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1771 CP210X_ECI_GPIO_MODE_MASK) >>
1772 CP210X_ECI_GPIO_MODE_OFFSET);
1773 } else if (intf_num == 1) {
1774 priv->gc.ngpio = 3;
1775
1776 if (mode.sci == CP210X_PIN_MODE_MODEM) {
1777 /* mark all GPIOs of this interface as reserved */
1778 priv->gpio_altfunc = 0xff;
1779 return 0;
1780 }
1781
1782 iface_config = config.sci_cfg;
1783 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1784 CP210X_SCI_GPIO_MODE_MASK) >>
1785 CP210X_SCI_GPIO_MODE_OFFSET);
1786 } else {
1787 return -ENODEV;
1788 }
1789
1790 /* mark all pins which are not in GPIO mode */
1791 if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */
1792 priv->gpio_altfunc |= BIT(0);
1793 if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */
1794 CP2105_GPIO1_RS485_MODE))
1795 priv->gpio_altfunc |= BIT(1);
1796
1797 /* driver implementation for CP2105 only supports outputs */
1798 priv->gpio_input = 0;
1799
1800 return 0;
1801 }
1802
cp2104_gpioconf_init(struct usb_serial * serial)1803 static int cp2104_gpioconf_init(struct usb_serial *serial)
1804 {
1805 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1806 struct cp210x_single_port_config config;
1807 u8 iface_config;
1808 u8 gpio_latch;
1809 int result;
1810 u8 i;
1811
1812 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1813 CP210X_GET_PORTCONFIG, &config,
1814 sizeof(config));
1815 if (result < 0)
1816 return result;
1817
1818 priv->gc.ngpio = 4;
1819
1820 iface_config = config.device_cfg;
1821 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1822 CP210X_GPIO_MODE_MASK) >>
1823 CP210X_GPIO_MODE_OFFSET);
1824 gpio_latch = (u8)((le16_to_cpu(config.reset_state) &
1825 CP210X_GPIO_MODE_MASK) >>
1826 CP210X_GPIO_MODE_OFFSET);
1827
1828 /* mark all pins which are not in GPIO mode */
1829 if (iface_config & CP2104_GPIO0_TXLED_MODE) /* GPIO 0 */
1830 priv->gpio_altfunc |= BIT(0);
1831 if (iface_config & CP2104_GPIO1_RXLED_MODE) /* GPIO 1 */
1832 priv->gpio_altfunc |= BIT(1);
1833 if (iface_config & CP2104_GPIO2_RS485_MODE) /* GPIO 2 */
1834 priv->gpio_altfunc |= BIT(2);
1835
1836 /*
1837 * Like CP2102N, CP2104 has also no strict input and output pin
1838 * modes.
1839 * Do the same input mode emulation as CP2102N.
1840 */
1841 for (i = 0; i < priv->gc.ngpio; ++i) {
1842 /*
1843 * Set direction to "input" iff pin is open-drain and reset
1844 * value is 1.
1845 */
1846 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1847 priv->gpio_input |= BIT(i);
1848 }
1849
1850 return 0;
1851 }
1852
cp2102n_gpioconf_init(struct usb_serial * serial)1853 static int cp2102n_gpioconf_init(struct usb_serial *serial)
1854 {
1855 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1856 const u16 config_size = 0x02a6;
1857 u8 gpio_rst_latch;
1858 u8 config_version;
1859 u8 gpio_pushpull;
1860 u8 *config_buf;
1861 u8 gpio_latch;
1862 u8 gpio_ctrl;
1863 int result;
1864 u8 i;
1865
1866 /*
1867 * Retrieve device configuration from the device.
1868 * The array received contains all customization settings done at the
1869 * factory/manufacturer. Format of the array is documented at the
1870 * time of writing at:
1871 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa
1872 */
1873 config_buf = kmalloc(config_size, GFP_KERNEL);
1874 if (!config_buf)
1875 return -ENOMEM;
1876
1877 result = cp210x_read_vendor_block(serial,
1878 REQTYPE_DEVICE_TO_HOST,
1879 CP210X_READ_2NCONFIG,
1880 config_buf,
1881 config_size);
1882 if (result < 0) {
1883 kfree(config_buf);
1884 return result;
1885 }
1886
1887 config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX];
1888 gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX];
1889 gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX];
1890 gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX];
1891
1892 kfree(config_buf);
1893
1894 /* Make sure this is a config format we understand. */
1895 if (config_version != 0x01)
1896 return -ENOTSUPP;
1897
1898 priv->gc.ngpio = 4;
1899
1900 /*
1901 * Get default pin states after reset. Needed so we can determine
1902 * the direction of an open-drain pin.
1903 */
1904 gpio_latch = (gpio_rst_latch >> 3) & 0x0f;
1905
1906 /* 0 indicates open-drain mode, 1 is push-pull */
1907 priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f;
1908
1909 /* 0 indicates GPIO mode, 1 is alternate function */
1910 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN20) {
1911 /* QFN20 is special... */
1912 if (gpio_ctrl & CP2102N_QFN20_GPIO0_CLK_MODE) /* GPIO 0 */
1913 priv->gpio_altfunc |= BIT(0);
1914 if (gpio_ctrl & CP2102N_QFN20_GPIO1_RS485_MODE) /* GPIO 1 */
1915 priv->gpio_altfunc |= BIT(1);
1916 if (gpio_ctrl & CP2102N_QFN20_GPIO2_TXLED_MODE) /* GPIO 2 */
1917 priv->gpio_altfunc |= BIT(2);
1918 if (gpio_ctrl & CP2102N_QFN20_GPIO3_RXLED_MODE) /* GPIO 3 */
1919 priv->gpio_altfunc |= BIT(3);
1920 } else {
1921 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f;
1922 }
1923
1924 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) {
1925 /*
1926 * For the QFN28 package, GPIO4-6 are controlled by
1927 * the low three bits of the mode/latch fields.
1928 * Contrary to the document linked above, the bits for
1929 * the SUSPEND pins are elsewhere. No alternate
1930 * function is available for these pins.
1931 */
1932 priv->gc.ngpio = 7;
1933 gpio_latch |= (gpio_rst_latch & 7) << 4;
1934 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4;
1935 }
1936
1937 /*
1938 * The CP2102N does not strictly has input and output pin modes,
1939 * it only knows open-drain and push-pull modes which is set at
1940 * factory. An open-drain pin can function both as an
1941 * input or an output. We emulate input mode for open-drain pins
1942 * by making sure they are not driven low, and we do not allow
1943 * push-pull pins to be set as an input.
1944 */
1945 for (i = 0; i < priv->gc.ngpio; ++i) {
1946 /*
1947 * Set direction to "input" iff pin is open-drain and reset
1948 * value is 1.
1949 */
1950 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1951 priv->gpio_input |= BIT(i);
1952 }
1953
1954 return 0;
1955 }
1956
cp210x_gpio_init(struct usb_serial * serial)1957 static int cp210x_gpio_init(struct usb_serial *serial)
1958 {
1959 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1960 int result;
1961
1962 switch (priv->partnum) {
1963 case CP210X_PARTNUM_CP2104:
1964 result = cp2104_gpioconf_init(serial);
1965 break;
1966 case CP210X_PARTNUM_CP2105:
1967 result = cp2105_gpioconf_init(serial);
1968 break;
1969 case CP210X_PARTNUM_CP2102N_QFN28:
1970 case CP210X_PARTNUM_CP2102N_QFN24:
1971 case CP210X_PARTNUM_CP2102N_QFN20:
1972 result = cp2102n_gpioconf_init(serial);
1973 break;
1974 default:
1975 return 0;
1976 }
1977
1978 if (result < 0)
1979 return result;
1980
1981 priv->gc.label = "cp210x";
1982 priv->gc.request = cp210x_gpio_request;
1983 priv->gc.get_direction = cp210x_gpio_direction_get;
1984 priv->gc.direction_input = cp210x_gpio_direction_input;
1985 priv->gc.direction_output = cp210x_gpio_direction_output;
1986 priv->gc.get = cp210x_gpio_get;
1987 priv->gc.set = cp210x_gpio_set;
1988 priv->gc.set_config = cp210x_gpio_set_config;
1989 priv->gc.owner = THIS_MODULE;
1990 priv->gc.parent = &serial->interface->dev;
1991 priv->gc.base = -1;
1992 priv->gc.can_sleep = true;
1993
1994 result = gpiochip_add_data(&priv->gc, serial);
1995 if (!result)
1996 priv->gpio_registered = true;
1997
1998 return result;
1999 }
2000
cp210x_gpio_remove(struct usb_serial * serial)2001 static void cp210x_gpio_remove(struct usb_serial *serial)
2002 {
2003 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2004
2005 if (priv->gpio_registered) {
2006 gpiochip_remove(&priv->gc);
2007 priv->gpio_registered = false;
2008 }
2009 }
2010
2011 #else
2012
cp210x_gpio_init(struct usb_serial * serial)2013 static int cp210x_gpio_init(struct usb_serial *serial)
2014 {
2015 return 0;
2016 }
2017
cp210x_gpio_remove(struct usb_serial * serial)2018 static void cp210x_gpio_remove(struct usb_serial *serial)
2019 {
2020 /* Nothing to do */
2021 }
2022
2023 #endif
2024
cp210x_port_probe(struct usb_serial_port * port)2025 static int cp210x_port_probe(struct usb_serial_port *port)
2026 {
2027 struct usb_serial *serial = port->serial;
2028 struct cp210x_port_private *port_priv;
2029 int ret;
2030
2031 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
2032 if (!port_priv)
2033 return -ENOMEM;
2034
2035 port_priv->bInterfaceNumber = cp210x_interface_num(serial);
2036
2037 usb_set_serial_port_data(port, port_priv);
2038
2039 ret = cp210x_detect_swapped_line_ctl(port);
2040 if (ret) {
2041 kfree(port_priv);
2042 return ret;
2043 }
2044
2045 return 0;
2046 }
2047
cp210x_port_remove(struct usb_serial_port * port)2048 static int cp210x_port_remove(struct usb_serial_port *port)
2049 {
2050 struct cp210x_port_private *port_priv;
2051
2052 port_priv = usb_get_serial_port_data(port);
2053 kfree(port_priv);
2054
2055 return 0;
2056 }
2057
cp210x_init_max_speed(struct usb_serial * serial)2058 static void cp210x_init_max_speed(struct usb_serial *serial)
2059 {
2060 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2061 bool use_actual_rate = false;
2062 speed_t min = 300;
2063 speed_t max;
2064
2065 switch (priv->partnum) {
2066 case CP210X_PARTNUM_CP2101:
2067 max = 921600;
2068 break;
2069 case CP210X_PARTNUM_CP2102:
2070 case CP210X_PARTNUM_CP2103:
2071 max = 1000000;
2072 break;
2073 case CP210X_PARTNUM_CP2104:
2074 use_actual_rate = true;
2075 max = 2000000;
2076 break;
2077 case CP210X_PARTNUM_CP2108:
2078 max = 2000000;
2079 break;
2080 case CP210X_PARTNUM_CP2105:
2081 if (cp210x_interface_num(serial) == 0) {
2082 use_actual_rate = true;
2083 max = 2000000; /* ECI */
2084 } else {
2085 min = 2400;
2086 max = 921600; /* SCI */
2087 }
2088 break;
2089 case CP210X_PARTNUM_CP2102N_QFN28:
2090 case CP210X_PARTNUM_CP2102N_QFN24:
2091 case CP210X_PARTNUM_CP2102N_QFN20:
2092 use_actual_rate = true;
2093 max = 3000000;
2094 break;
2095 default:
2096 max = 2000000;
2097 break;
2098 }
2099
2100 priv->min_speed = min;
2101 priv->max_speed = max;
2102 priv->use_actual_rate = use_actual_rate;
2103 }
2104
cp2102_determine_quirks(struct usb_serial * serial)2105 static void cp2102_determine_quirks(struct usb_serial *serial)
2106 {
2107 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2108 u8 *buf;
2109 int ret;
2110
2111 buf = kmalloc(2, GFP_KERNEL);
2112 if (!buf)
2113 return;
2114 /*
2115 * Some (possibly counterfeit) CP2102 do not support event-insertion
2116 * mode and respond differently to malformed vendor requests.
2117 * Specifically, they return one instead of two bytes when sent a
2118 * two-byte part-number request.
2119 */
2120 ret = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2121 CP210X_VENDOR_SPECIFIC, REQTYPE_DEVICE_TO_HOST,
2122 CP210X_GET_PARTNUM, 0, buf, 2, USB_CTRL_GET_TIMEOUT);
2123 if (ret == 1) {
2124 dev_dbg(&serial->interface->dev,
2125 "device does not support event-insertion mode\n");
2126 priv->no_event_mode = true;
2127 }
2128
2129 kfree(buf);
2130 }
2131
cp210x_determine_quirks(struct usb_serial * serial)2132 static void cp210x_determine_quirks(struct usb_serial *serial)
2133 {
2134 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2135
2136 switch (priv->partnum) {
2137 case CP210X_PARTNUM_CP2102:
2138 cp2102_determine_quirks(serial);
2139 break;
2140 default:
2141 break;
2142 }
2143 }
2144
cp210x_attach(struct usb_serial * serial)2145 static int cp210x_attach(struct usb_serial *serial)
2146 {
2147 int result;
2148 struct cp210x_serial_private *priv;
2149
2150 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2151 if (!priv)
2152 return -ENOMEM;
2153
2154 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
2155 CP210X_GET_PARTNUM, &priv->partnum,
2156 sizeof(priv->partnum));
2157 if (result < 0) {
2158 dev_warn(&serial->interface->dev,
2159 "querying part number failed\n");
2160 priv->partnum = CP210X_PARTNUM_UNKNOWN;
2161 }
2162
2163 usb_set_serial_data(serial, priv);
2164
2165 cp210x_determine_quirks(serial);
2166 cp210x_init_max_speed(serial);
2167
2168 result = cp210x_gpio_init(serial);
2169 if (result < 0) {
2170 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n",
2171 result);
2172 }
2173
2174 return 0;
2175 }
2176
cp210x_disconnect(struct usb_serial * serial)2177 static void cp210x_disconnect(struct usb_serial *serial)
2178 {
2179 cp210x_gpio_remove(serial);
2180 }
2181
cp210x_release(struct usb_serial * serial)2182 static void cp210x_release(struct usb_serial *serial)
2183 {
2184 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2185
2186 cp210x_gpio_remove(serial);
2187
2188 kfree(priv);
2189 }
2190
2191 module_usb_serial_driver(serial_drivers, id_table);
2192
2193 MODULE_DESCRIPTION(DRIVER_DESC);
2194 MODULE_LICENSE("GPL v2");
2195