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(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */
59 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
60 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
61 { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
62 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
63 { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */
64 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
65 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
66 { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */
67 { USB_DEVICE(0x0988, 0x0578) }, /* Teraoka AD2000 */
68 { USB_DEVICE(0x0B00, 0x3070) }, /* Ingenico 3070 */
69 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
70 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
71 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
72 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
73 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
74 { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */
75 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
76 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
77 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
78 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
79 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
80 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
81 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
82 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
83 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
84 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
85 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
86 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
87 { USB_DEVICE(0x10C4, 0x8056) }, /* Lorenz Messtechnik devices */
88 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
89 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
90 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
91 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
92 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
93 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
94 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
95 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
96 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
97 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
98 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
99 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
100 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
101 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
102 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
103 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
104 { USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */
105 { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */
106 { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */
107 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
108 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
109 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
110 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
111 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
112 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
113 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
114 { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */
115 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
116 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
117 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
118 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
119 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
120 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
121 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
122 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */
123 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
124 { USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */
125 { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */
126 { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */
127 { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */
128 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
129 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
130 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
131 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
132 { USB_DEVICE(0x10C4, 0x83AA) }, /* Mark-10 Digital Force Gauge */
133 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
134 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
135 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
136 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
137 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */
138 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
139 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
140 { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */
141 { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */
142 { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */
143 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
144 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
145 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
146 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
147 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
148 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
149 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
150 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
151 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
152 { USB_DEVICE(0x10C4, 0x88D8) }, /* Acuity Brands nLight Air Adapter */
153 { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */
154 { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */
155 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
156 { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */
157 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
158 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
159 { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */
160 { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */
161 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
162 { USB_DEVICE(0x10C4, 0x8A5B) }, /* CEL EM3588 ZigBee USB Stick */
163 { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */
164 { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */
165 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
166 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
167 { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */
168 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
169 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
170 { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */
171 { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */
172 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
173 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
174 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
175 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
176 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
177 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
178 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
179 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
180 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
181 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
182 { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */
183 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
184 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
185 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
186 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
187 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
188 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
189 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
190 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
191 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
192 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
193 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
194 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
195 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
196 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
197 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
198 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
199 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
200 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
201 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
202 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
203 { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */
204 { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */
205 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
206 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
207 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
208 { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */
209 { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */
210 { USB_DEVICE(0x1901, 0x0197) }, /* GE CS1000 M.2 Key E serial interface */
211 { USB_DEVICE(0x1901, 0x0198) }, /* GE CS1000 Display serial interface */
212 { USB_DEVICE(0x199B, 0xBA30) }, /* LORD WSDA-200-USB */
213 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
214 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
215 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
216 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
217 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
218 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
219 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
220 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
221 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
222 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
223 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
224 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
225 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
226 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
227 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
228 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
229 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
230 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
231 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
232 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
233 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
234 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
235 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
236 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
237 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
238 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
239 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
240 { USB_DEVICE(0x2184, 0x0030) }, /* GW Instek GDM-834x Digital Multimeter */
241 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
242 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
243 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
244 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
245 { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */
246 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
247 { } /* Terminating Entry */
248 };
249
250 MODULE_DEVICE_TABLE(usb, id_table);
251
252 struct cp210x_serial_private {
253 #ifdef CONFIG_GPIOLIB
254 struct gpio_chip gc;
255 bool gpio_registered;
256 u8 gpio_pushpull;
257 u8 gpio_altfunc;
258 u8 gpio_input;
259 #endif
260 u8 partnum;
261 speed_t min_speed;
262 speed_t max_speed;
263 bool use_actual_rate;
264 bool no_event_mode;
265 };
266
267 enum cp210x_event_state {
268 ES_DATA,
269 ES_ESCAPE,
270 ES_LSR,
271 ES_LSR_DATA_0,
272 ES_LSR_DATA_1,
273 ES_MSR
274 };
275
276 struct cp210x_port_private {
277 u8 bInterfaceNumber;
278 bool has_swapped_line_ctl;
279 bool event_mode;
280 enum cp210x_event_state event_state;
281 u8 lsr;
282 };
283
284 static struct usb_serial_driver cp210x_device = {
285 .driver = {
286 .owner = THIS_MODULE,
287 .name = "cp210x",
288 },
289 .id_table = id_table,
290 .num_ports = 1,
291 .bulk_in_size = 256,
292 .bulk_out_size = 256,
293 .open = cp210x_open,
294 .close = cp210x_close,
295 .break_ctl = cp210x_break_ctl,
296 .set_termios = cp210x_set_termios,
297 .tx_empty = cp210x_tx_empty,
298 .throttle = usb_serial_generic_throttle,
299 .unthrottle = usb_serial_generic_unthrottle,
300 .tiocmget = cp210x_tiocmget,
301 .tiocmset = cp210x_tiocmset,
302 .get_icount = usb_serial_generic_get_icount,
303 .attach = cp210x_attach,
304 .disconnect = cp210x_disconnect,
305 .release = cp210x_release,
306 .port_probe = cp210x_port_probe,
307 .port_remove = cp210x_port_remove,
308 .dtr_rts = cp210x_dtr_rts,
309 .process_read_urb = cp210x_process_read_urb,
310 };
311
312 static struct usb_serial_driver * const serial_drivers[] = {
313 &cp210x_device, NULL
314 };
315
316 /* Config request types */
317 #define REQTYPE_HOST_TO_INTERFACE 0x41
318 #define REQTYPE_INTERFACE_TO_HOST 0xc1
319 #define REQTYPE_HOST_TO_DEVICE 0x40
320 #define REQTYPE_DEVICE_TO_HOST 0xc0
321
322 /* Config request codes */
323 #define CP210X_IFC_ENABLE 0x00
324 #define CP210X_SET_BAUDDIV 0x01
325 #define CP210X_GET_BAUDDIV 0x02
326 #define CP210X_SET_LINE_CTL 0x03
327 #define CP210X_GET_LINE_CTL 0x04
328 #define CP210X_SET_BREAK 0x05
329 #define CP210X_IMM_CHAR 0x06
330 #define CP210X_SET_MHS 0x07
331 #define CP210X_GET_MDMSTS 0x08
332 #define CP210X_SET_XON 0x09
333 #define CP210X_SET_XOFF 0x0A
334 #define CP210X_SET_EVENTMASK 0x0B
335 #define CP210X_GET_EVENTMASK 0x0C
336 #define CP210X_SET_CHAR 0x0D
337 #define CP210X_GET_CHARS 0x0E
338 #define CP210X_GET_PROPS 0x0F
339 #define CP210X_GET_COMM_STATUS 0x10
340 #define CP210X_RESET 0x11
341 #define CP210X_PURGE 0x12
342 #define CP210X_SET_FLOW 0x13
343 #define CP210X_GET_FLOW 0x14
344 #define CP210X_EMBED_EVENTS 0x15
345 #define CP210X_GET_EVENTSTATE 0x16
346 #define CP210X_SET_CHARS 0x19
347 #define CP210X_GET_BAUDRATE 0x1D
348 #define CP210X_SET_BAUDRATE 0x1E
349 #define CP210X_VENDOR_SPECIFIC 0xFF
350
351 /* CP210X_IFC_ENABLE */
352 #define UART_ENABLE 0x0001
353 #define UART_DISABLE 0x0000
354
355 /* CP210X_(SET|GET)_BAUDDIV */
356 #define BAUD_RATE_GEN_FREQ 0x384000
357
358 /* CP210X_(SET|GET)_LINE_CTL */
359 #define BITS_DATA_MASK 0X0f00
360 #define BITS_DATA_5 0X0500
361 #define BITS_DATA_6 0X0600
362 #define BITS_DATA_7 0X0700
363 #define BITS_DATA_8 0X0800
364 #define BITS_DATA_9 0X0900
365
366 #define BITS_PARITY_MASK 0x00f0
367 #define BITS_PARITY_NONE 0x0000
368 #define BITS_PARITY_ODD 0x0010
369 #define BITS_PARITY_EVEN 0x0020
370 #define BITS_PARITY_MARK 0x0030
371 #define BITS_PARITY_SPACE 0x0040
372
373 #define BITS_STOP_MASK 0x000f
374 #define BITS_STOP_1 0x0000
375 #define BITS_STOP_1_5 0x0001
376 #define BITS_STOP_2 0x0002
377
378 /* CP210X_SET_BREAK */
379 #define BREAK_ON 0x0001
380 #define BREAK_OFF 0x0000
381
382 /* CP210X_(SET_MHS|GET_MDMSTS) */
383 #define CONTROL_DTR 0x0001
384 #define CONTROL_RTS 0x0002
385 #define CONTROL_CTS 0x0010
386 #define CONTROL_DSR 0x0020
387 #define CONTROL_RING 0x0040
388 #define CONTROL_DCD 0x0080
389 #define CONTROL_WRITE_DTR 0x0100
390 #define CONTROL_WRITE_RTS 0x0200
391
392 /* CP210X_VENDOR_SPECIFIC values */
393 #define CP210X_READ_2NCONFIG 0x000E
394 #define CP210X_READ_LATCH 0x00C2
395 #define CP210X_GET_PARTNUM 0x370B
396 #define CP210X_GET_PORTCONFIG 0x370C
397 #define CP210X_GET_DEVICEMODE 0x3711
398 #define CP210X_WRITE_LATCH 0x37E1
399
400 /* Part number definitions */
401 #define CP210X_PARTNUM_CP2101 0x01
402 #define CP210X_PARTNUM_CP2102 0x02
403 #define CP210X_PARTNUM_CP2103 0x03
404 #define CP210X_PARTNUM_CP2104 0x04
405 #define CP210X_PARTNUM_CP2105 0x05
406 #define CP210X_PARTNUM_CP2108 0x08
407 #define CP210X_PARTNUM_CP2102N_QFN28 0x20
408 #define CP210X_PARTNUM_CP2102N_QFN24 0x21
409 #define CP210X_PARTNUM_CP2102N_QFN20 0x22
410 #define CP210X_PARTNUM_UNKNOWN 0xFF
411
412 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
413 struct cp210x_comm_status {
414 __le32 ulErrors;
415 __le32 ulHoldReasons;
416 __le32 ulAmountInInQueue;
417 __le32 ulAmountInOutQueue;
418 u8 bEofReceived;
419 u8 bWaitForImmediate;
420 u8 bReserved;
421 } __packed;
422
423 /*
424 * CP210X_PURGE - 16 bits passed in wValue of USB request.
425 * SiLabs app note AN571 gives a strange description of the 4 bits:
426 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
427 * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
428 */
429 #define PURGE_ALL 0x000f
430
431 /* CP210X_EMBED_EVENTS */
432 #define CP210X_ESCCHAR 0xec
433
434 #define CP210X_LSR_OVERRUN BIT(1)
435 #define CP210X_LSR_PARITY BIT(2)
436 #define CP210X_LSR_FRAME BIT(3)
437 #define CP210X_LSR_BREAK BIT(4)
438
439
440 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
441 struct cp210x_flow_ctl {
442 __le32 ulControlHandshake;
443 __le32 ulFlowReplace;
444 __le32 ulXonLimit;
445 __le32 ulXoffLimit;
446 };
447
448 /* cp210x_flow_ctl::ulControlHandshake */
449 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0)
450 #define CP210X_SERIAL_DTR_SHIFT(_mode) (_mode)
451 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3)
452 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4)
453 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5)
454 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6)
455
456 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */
457 #define CP210X_SERIAL_DTR_INACTIVE 0
458 #define CP210X_SERIAL_DTR_ACTIVE 1
459 #define CP210X_SERIAL_DTR_FLOW_CTL 2
460
461 /* cp210x_flow_ctl::ulFlowReplace */
462 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0)
463 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1)
464 #define CP210X_SERIAL_ERROR_CHAR BIT(2)
465 #define CP210X_SERIAL_NULL_STRIPPING BIT(3)
466 #define CP210X_SERIAL_BREAK_CHAR BIT(4)
467 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6)
468 #define CP210X_SERIAL_RTS_SHIFT(_mode) (_mode << 6)
469 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31)
470
471 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */
472 #define CP210X_SERIAL_RTS_INACTIVE 0
473 #define CP210X_SERIAL_RTS_ACTIVE 1
474 #define CP210X_SERIAL_RTS_FLOW_CTL 2
475
476 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
477 struct cp210x_pin_mode {
478 u8 eci;
479 u8 sci;
480 };
481
482 #define CP210X_PIN_MODE_MODEM 0
483 #define CP210X_PIN_MODE_GPIO BIT(0)
484
485 /*
486 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes
487 * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes.
488 */
489 struct cp210x_dual_port_config {
490 __le16 gpio_mode;
491 u8 __pad0[2];
492 __le16 reset_state;
493 u8 __pad1[4];
494 __le16 suspend_state;
495 u8 sci_cfg;
496 u8 eci_cfg;
497 u8 device_cfg;
498 } __packed;
499
500 /*
501 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes
502 * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes.
503 */
504 struct cp210x_single_port_config {
505 __le16 gpio_mode;
506 u8 __pad0[2];
507 __le16 reset_state;
508 u8 __pad1[4];
509 __le16 suspend_state;
510 u8 device_cfg;
511 } __packed;
512
513 /* GPIO modes */
514 #define CP210X_SCI_GPIO_MODE_OFFSET 9
515 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9)
516
517 #define CP210X_ECI_GPIO_MODE_OFFSET 2
518 #define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2)
519
520 #define CP210X_GPIO_MODE_OFFSET 8
521 #define CP210X_GPIO_MODE_MASK GENMASK(11, 8)
522
523 /* CP2105 port configuration values */
524 #define CP2105_GPIO0_TXLED_MODE BIT(0)
525 #define CP2105_GPIO1_RXLED_MODE BIT(1)
526 #define CP2105_GPIO1_RS485_MODE BIT(2)
527
528 /* CP2104 port configuration values */
529 #define CP2104_GPIO0_TXLED_MODE BIT(0)
530 #define CP2104_GPIO1_RXLED_MODE BIT(1)
531 #define CP2104_GPIO2_RS485_MODE BIT(2)
532
533 /* CP2102N configuration array indices */
534 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX 2
535 #define CP210X_2NCONFIG_GPIO_MODE_IDX 581
536 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587
537 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600
538
539 /* CP2102N QFN20 port configuration values */
540 #define CP2102N_QFN20_GPIO2_TXLED_MODE BIT(2)
541 #define CP2102N_QFN20_GPIO3_RXLED_MODE BIT(3)
542 #define CP2102N_QFN20_GPIO1_RS485_MODE BIT(4)
543 #define CP2102N_QFN20_GPIO0_CLK_MODE BIT(6)
544
545 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */
546 struct cp210x_gpio_write {
547 u8 mask;
548 u8 state;
549 };
550
551 /*
552 * Helper to get interface number when we only have struct usb_serial.
553 */
cp210x_interface_num(struct usb_serial * serial)554 static u8 cp210x_interface_num(struct usb_serial *serial)
555 {
556 struct usb_host_interface *cur_altsetting;
557
558 cur_altsetting = serial->interface->cur_altsetting;
559
560 return cur_altsetting->desc.bInterfaceNumber;
561 }
562
563 /*
564 * Reads a variable-sized block of CP210X_ registers, identified by req.
565 * Returns data into buf in native USB byte order.
566 */
cp210x_read_reg_block(struct usb_serial_port * port,u8 req,void * buf,int bufsize)567 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
568 void *buf, int bufsize)
569 {
570 struct usb_serial *serial = port->serial;
571 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
572 void *dmabuf;
573 int result;
574
575 dmabuf = kmalloc(bufsize, GFP_KERNEL);
576 if (!dmabuf) {
577 /*
578 * FIXME Some callers don't bother to check for error,
579 * at least give them consistent junk until they are fixed
580 */
581 memset(buf, 0, bufsize);
582 return -ENOMEM;
583 }
584
585 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
586 req, REQTYPE_INTERFACE_TO_HOST, 0,
587 port_priv->bInterfaceNumber, dmabuf, bufsize,
588 USB_CTRL_SET_TIMEOUT);
589 if (result == bufsize) {
590 memcpy(buf, dmabuf, bufsize);
591 result = 0;
592 } else {
593 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
594 req, bufsize, result);
595 if (result >= 0)
596 result = -EIO;
597
598 /*
599 * FIXME Some callers don't bother to check for error,
600 * at least give them consistent junk until they are fixed
601 */
602 memset(buf, 0, bufsize);
603 }
604
605 kfree(dmabuf);
606
607 return result;
608 }
609
610 /*
611 * Reads any 32-bit CP210X_ register identified by req.
612 */
cp210x_read_u32_reg(struct usb_serial_port * port,u8 req,u32 * val)613 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val)
614 {
615 __le32 le32_val;
616 int err;
617
618 err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val));
619 if (err) {
620 /*
621 * FIXME Some callers don't bother to check for error,
622 * at least give them consistent junk until they are fixed
623 */
624 *val = 0;
625 return err;
626 }
627
628 *val = le32_to_cpu(le32_val);
629
630 return 0;
631 }
632
633 /*
634 * Reads any 16-bit CP210X_ register identified by req.
635 */
cp210x_read_u16_reg(struct usb_serial_port * port,u8 req,u16 * val)636 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val)
637 {
638 __le16 le16_val;
639 int err;
640
641 err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val));
642 if (err)
643 return err;
644
645 *val = le16_to_cpu(le16_val);
646
647 return 0;
648 }
649
650 /*
651 * Reads any 8-bit CP210X_ register identified by req.
652 */
cp210x_read_u8_reg(struct usb_serial_port * port,u8 req,u8 * val)653 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
654 {
655 return cp210x_read_reg_block(port, req, val, sizeof(*val));
656 }
657
658 /*
659 * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
660 * Returns data into buf in native USB byte order.
661 */
cp210x_read_vendor_block(struct usb_serial * serial,u8 type,u16 val,void * buf,int bufsize)662 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
663 void *buf, int bufsize)
664 {
665 void *dmabuf;
666 int result;
667
668 dmabuf = kmalloc(bufsize, GFP_KERNEL);
669 if (!dmabuf)
670 return -ENOMEM;
671
672 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
673 CP210X_VENDOR_SPECIFIC, type, val,
674 cp210x_interface_num(serial), dmabuf, bufsize,
675 USB_CTRL_GET_TIMEOUT);
676 if (result == bufsize) {
677 memcpy(buf, dmabuf, bufsize);
678 result = 0;
679 } else {
680 dev_err(&serial->interface->dev,
681 "failed to get vendor val 0x%04x size %d: %d\n", val,
682 bufsize, result);
683 if (result >= 0)
684 result = -EIO;
685 }
686
687 kfree(dmabuf);
688
689 return result;
690 }
691
692 /*
693 * Writes any 16-bit CP210X_ register (req) whose value is passed
694 * entirely in the wValue field of the USB request.
695 */
cp210x_write_u16_reg(struct usb_serial_port * port,u8 req,u16 val)696 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
697 {
698 struct usb_serial *serial = port->serial;
699 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
700 int result;
701
702 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
703 req, REQTYPE_HOST_TO_INTERFACE, val,
704 port_priv->bInterfaceNumber, NULL, 0,
705 USB_CTRL_SET_TIMEOUT);
706 if (result < 0) {
707 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
708 req, result);
709 }
710
711 return result;
712 }
713
714 /*
715 * Writes a variable-sized block of CP210X_ registers, identified by req.
716 * Data in buf must be in native USB byte order.
717 */
cp210x_write_reg_block(struct usb_serial_port * port,u8 req,void * buf,int bufsize)718 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
719 void *buf, int bufsize)
720 {
721 struct usb_serial *serial = port->serial;
722 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
723 void *dmabuf;
724 int result;
725
726 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
727 if (!dmabuf)
728 return -ENOMEM;
729
730 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
731 req, REQTYPE_HOST_TO_INTERFACE, 0,
732 port_priv->bInterfaceNumber, dmabuf, bufsize,
733 USB_CTRL_SET_TIMEOUT);
734
735 kfree(dmabuf);
736
737 if (result == bufsize) {
738 result = 0;
739 } else {
740 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
741 req, bufsize, result);
742 if (result >= 0)
743 result = -EIO;
744 }
745
746 return result;
747 }
748
749 /*
750 * Writes any 32-bit CP210X_ register identified by req.
751 */
cp210x_write_u32_reg(struct usb_serial_port * port,u8 req,u32 val)752 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
753 {
754 __le32 le32_val;
755
756 le32_val = cpu_to_le32(val);
757
758 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
759 }
760
761 #ifdef CONFIG_GPIOLIB
762 /*
763 * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
764 * Data in buf must be in native USB byte order.
765 */
cp210x_write_vendor_block(struct usb_serial * serial,u8 type,u16 val,void * buf,int bufsize)766 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
767 u16 val, void *buf, int bufsize)
768 {
769 void *dmabuf;
770 int result;
771
772 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
773 if (!dmabuf)
774 return -ENOMEM;
775
776 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
777 CP210X_VENDOR_SPECIFIC, type, val,
778 cp210x_interface_num(serial), dmabuf, bufsize,
779 USB_CTRL_SET_TIMEOUT);
780
781 kfree(dmabuf);
782
783 if (result == bufsize) {
784 result = 0;
785 } else {
786 dev_err(&serial->interface->dev,
787 "failed to set vendor val 0x%04x size %d: %d\n", val,
788 bufsize, result);
789 if (result >= 0)
790 result = -EIO;
791 }
792
793 return result;
794 }
795 #endif
796
797 /*
798 * Detect CP2108 GET_LINE_CTL bug and activate workaround.
799 * Write a known good value 0x800, read it back.
800 * If it comes back swapped the bug is detected.
801 * Preserve the original register value.
802 */
cp210x_detect_swapped_line_ctl(struct usb_serial_port * port)803 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
804 {
805 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
806 u16 line_ctl_save;
807 u16 line_ctl_test;
808 int err;
809
810 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save);
811 if (err)
812 return err;
813
814 err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800);
815 if (err)
816 return err;
817
818 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test);
819 if (err)
820 return err;
821
822 if (line_ctl_test == 8) {
823 port_priv->has_swapped_line_ctl = true;
824 line_ctl_save = swab16(line_ctl_save);
825 }
826
827 return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save);
828 }
829
830 /*
831 * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL)
832 * to workaround cp2108 bug and get correct value.
833 */
cp210x_get_line_ctl(struct usb_serial_port * port,u16 * ctl)834 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl)
835 {
836 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
837 int err;
838
839 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl);
840 if (err)
841 return err;
842
843 /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
844 if (port_priv->has_swapped_line_ctl)
845 *ctl = swab16(*ctl);
846
847 return 0;
848 }
849
cp210x_open(struct tty_struct * tty,struct usb_serial_port * port)850 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
851 {
852 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
853 int result;
854
855 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
856 if (result) {
857 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
858 return result;
859 }
860
861 /* Configure the termios structure */
862 cp210x_get_termios(tty, port);
863
864 if (tty) {
865 /* The baud rate must be initialised on cp2104 */
866 cp210x_change_speed(tty, port, NULL);
867
868 if (I_INPCK(tty))
869 cp210x_enable_event_mode(port);
870 }
871
872 result = usb_serial_generic_open(tty, port);
873 if (result)
874 goto err_disable;
875
876 return 0;
877
878 err_disable:
879 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
880 port_priv->event_mode = false;
881
882 return result;
883 }
884
cp210x_close(struct usb_serial_port * port)885 static void cp210x_close(struct usb_serial_port *port)
886 {
887 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
888
889 usb_serial_generic_close(port);
890
891 /* Clear both queues; cp2108 needs this to avoid an occasional hang */
892 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
893
894 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
895
896 /* Disabling the interface disables event-insertion mode. */
897 port_priv->event_mode = false;
898 }
899
cp210x_process_lsr(struct usb_serial_port * port,unsigned char lsr,char * flag)900 static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag)
901 {
902 if (lsr & CP210X_LSR_BREAK) {
903 port->icount.brk++;
904 *flag = TTY_BREAK;
905 } else if (lsr & CP210X_LSR_PARITY) {
906 port->icount.parity++;
907 *flag = TTY_PARITY;
908 } else if (lsr & CP210X_LSR_FRAME) {
909 port->icount.frame++;
910 *flag = TTY_FRAME;
911 }
912
913 if (lsr & CP210X_LSR_OVERRUN) {
914 port->icount.overrun++;
915 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
916 }
917 }
918
cp210x_process_char(struct usb_serial_port * port,unsigned char * ch,char * flag)919 static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag)
920 {
921 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
922
923 switch (port_priv->event_state) {
924 case ES_DATA:
925 if (*ch == CP210X_ESCCHAR) {
926 port_priv->event_state = ES_ESCAPE;
927 break;
928 }
929 return false;
930 case ES_ESCAPE:
931 switch (*ch) {
932 case 0:
933 dev_dbg(&port->dev, "%s - escape char\n", __func__);
934 *ch = CP210X_ESCCHAR;
935 port_priv->event_state = ES_DATA;
936 return false;
937 case 1:
938 port_priv->event_state = ES_LSR_DATA_0;
939 break;
940 case 2:
941 port_priv->event_state = ES_LSR;
942 break;
943 case 3:
944 port_priv->event_state = ES_MSR;
945 break;
946 default:
947 dev_err(&port->dev, "malformed event 0x%02x\n", *ch);
948 port_priv->event_state = ES_DATA;
949 break;
950 }
951 break;
952 case ES_LSR_DATA_0:
953 port_priv->lsr = *ch;
954 port_priv->event_state = ES_LSR_DATA_1;
955 break;
956 case ES_LSR_DATA_1:
957 dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n",
958 __func__, port_priv->lsr, *ch);
959 cp210x_process_lsr(port, port_priv->lsr, flag);
960 port_priv->event_state = ES_DATA;
961 return false;
962 case ES_LSR:
963 dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch);
964 port_priv->lsr = *ch;
965 cp210x_process_lsr(port, port_priv->lsr, flag);
966 port_priv->event_state = ES_DATA;
967 break;
968 case ES_MSR:
969 dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch);
970 /* unimplemented */
971 port_priv->event_state = ES_DATA;
972 break;
973 }
974
975 return true;
976 }
977
cp210x_process_read_urb(struct urb * urb)978 static void cp210x_process_read_urb(struct urb *urb)
979 {
980 struct usb_serial_port *port = urb->context;
981 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
982 unsigned char *ch = urb->transfer_buffer;
983 char flag;
984 int i;
985
986 if (!urb->actual_length)
987 return;
988
989 if (port_priv->event_mode) {
990 for (i = 0; i < urb->actual_length; i++, ch++) {
991 flag = TTY_NORMAL;
992
993 if (cp210x_process_char(port, ch, &flag))
994 continue;
995
996 tty_insert_flip_char(&port->port, *ch, flag);
997 }
998 } else {
999 tty_insert_flip_string(&port->port, ch, urb->actual_length);
1000 }
1001 tty_flip_buffer_push(&port->port);
1002 }
1003
1004 /*
1005 * Read how many bytes are waiting in the TX queue.
1006 */
cp210x_get_tx_queue_byte_count(struct usb_serial_port * port,u32 * count)1007 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
1008 u32 *count)
1009 {
1010 struct usb_serial *serial = port->serial;
1011 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1012 struct cp210x_comm_status *sts;
1013 int result;
1014
1015 sts = kmalloc(sizeof(*sts), GFP_KERNEL);
1016 if (!sts)
1017 return -ENOMEM;
1018
1019 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
1020 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
1021 0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
1022 USB_CTRL_GET_TIMEOUT);
1023 if (result == sizeof(*sts)) {
1024 *count = le32_to_cpu(sts->ulAmountInOutQueue);
1025 result = 0;
1026 } else {
1027 dev_err(&port->dev, "failed to get comm status: %d\n", result);
1028 if (result >= 0)
1029 result = -EIO;
1030 }
1031
1032 kfree(sts);
1033
1034 return result;
1035 }
1036
cp210x_tx_empty(struct usb_serial_port * port)1037 static bool cp210x_tx_empty(struct usb_serial_port *port)
1038 {
1039 int err;
1040 u32 count;
1041
1042 err = cp210x_get_tx_queue_byte_count(port, &count);
1043 if (err)
1044 return true;
1045
1046 return !count;
1047 }
1048
1049 /*
1050 * cp210x_get_termios
1051 * Reads the baud rate, data bits, parity, stop bits and flow control mode
1052 * from the device, corrects any unsupported values, and configures the
1053 * termios structure to reflect the state of the device
1054 */
cp210x_get_termios(struct tty_struct * tty,struct usb_serial_port * port)1055 static void cp210x_get_termios(struct tty_struct *tty,
1056 struct usb_serial_port *port)
1057 {
1058 unsigned int baud;
1059
1060 if (tty) {
1061 cp210x_get_termios_port(tty->driver_data,
1062 &tty->termios.c_cflag, &baud);
1063 tty_encode_baud_rate(tty, baud, baud);
1064 } else {
1065 tcflag_t cflag;
1066 cflag = 0;
1067 cp210x_get_termios_port(port, &cflag, &baud);
1068 }
1069 }
1070
1071 /*
1072 * cp210x_get_termios_port
1073 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
1074 */
cp210x_get_termios_port(struct usb_serial_port * port,tcflag_t * cflagp,unsigned int * baudp)1075 static void cp210x_get_termios_port(struct usb_serial_port *port,
1076 tcflag_t *cflagp, unsigned int *baudp)
1077 {
1078 struct device *dev = &port->dev;
1079 tcflag_t cflag;
1080 struct cp210x_flow_ctl flow_ctl;
1081 u32 baud;
1082 u16 bits;
1083 u32 ctl_hs;
1084 u32 flow_repl;
1085
1086 cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud);
1087
1088 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
1089 *baudp = baud;
1090
1091 cflag = *cflagp;
1092
1093 cp210x_get_line_ctl(port, &bits);
1094 cflag &= ~CSIZE;
1095 switch (bits & BITS_DATA_MASK) {
1096 case BITS_DATA_5:
1097 dev_dbg(dev, "%s - data bits = 5\n", __func__);
1098 cflag |= CS5;
1099 break;
1100 case BITS_DATA_6:
1101 dev_dbg(dev, "%s - data bits = 6\n", __func__);
1102 cflag |= CS6;
1103 break;
1104 case BITS_DATA_7:
1105 dev_dbg(dev, "%s - data bits = 7\n", __func__);
1106 cflag |= CS7;
1107 break;
1108 case BITS_DATA_8:
1109 dev_dbg(dev, "%s - data bits = 8\n", __func__);
1110 cflag |= CS8;
1111 break;
1112 case BITS_DATA_9:
1113 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
1114 cflag |= CS8;
1115 bits &= ~BITS_DATA_MASK;
1116 bits |= BITS_DATA_8;
1117 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1118 break;
1119 default:
1120 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
1121 cflag |= CS8;
1122 bits &= ~BITS_DATA_MASK;
1123 bits |= BITS_DATA_8;
1124 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1125 break;
1126 }
1127
1128 switch (bits & BITS_PARITY_MASK) {
1129 case BITS_PARITY_NONE:
1130 dev_dbg(dev, "%s - parity = NONE\n", __func__);
1131 cflag &= ~PARENB;
1132 break;
1133 case BITS_PARITY_ODD:
1134 dev_dbg(dev, "%s - parity = ODD\n", __func__);
1135 cflag |= (PARENB|PARODD);
1136 break;
1137 case BITS_PARITY_EVEN:
1138 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
1139 cflag &= ~PARODD;
1140 cflag |= PARENB;
1141 break;
1142 case BITS_PARITY_MARK:
1143 dev_dbg(dev, "%s - parity = MARK\n", __func__);
1144 cflag |= (PARENB|PARODD|CMSPAR);
1145 break;
1146 case BITS_PARITY_SPACE:
1147 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
1148 cflag &= ~PARODD;
1149 cflag |= (PARENB|CMSPAR);
1150 break;
1151 default:
1152 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
1153 cflag &= ~PARENB;
1154 bits &= ~BITS_PARITY_MASK;
1155 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1156 break;
1157 }
1158
1159 cflag &= ~CSTOPB;
1160 switch (bits & BITS_STOP_MASK) {
1161 case BITS_STOP_1:
1162 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
1163 break;
1164 case BITS_STOP_1_5:
1165 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
1166 bits &= ~BITS_STOP_MASK;
1167 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1168 break;
1169 case BITS_STOP_2:
1170 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1171 cflag |= CSTOPB;
1172 break;
1173 default:
1174 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
1175 bits &= ~BITS_STOP_MASK;
1176 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1177 break;
1178 }
1179
1180 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1181 sizeof(flow_ctl));
1182 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1183 if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) {
1184 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1185 /*
1186 * When the port is closed, the CP210x hardware disables
1187 * auto-RTS and RTS is deasserted but it leaves auto-CTS when
1188 * in hardware flow control mode. When re-opening the port, if
1189 * auto-CTS is enabled on the cp210x, then auto-RTS must be
1190 * re-enabled in the driver.
1191 */
1192 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1193 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1194 flow_repl |= CP210X_SERIAL_RTS_SHIFT(CP210X_SERIAL_RTS_FLOW_CTL);
1195 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1196 cp210x_write_reg_block(port,
1197 CP210X_SET_FLOW,
1198 &flow_ctl,
1199 sizeof(flow_ctl));
1200
1201 cflag |= CRTSCTS;
1202 } else {
1203 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1204 cflag &= ~CRTSCTS;
1205 }
1206
1207 *cflagp = cflag;
1208 }
1209
1210 struct cp210x_rate {
1211 speed_t rate;
1212 speed_t high;
1213 };
1214
1215 static const struct cp210x_rate cp210x_an205_table1[] = {
1216 { 300, 300 },
1217 { 600, 600 },
1218 { 1200, 1200 },
1219 { 1800, 1800 },
1220 { 2400, 2400 },
1221 { 4000, 4000 },
1222 { 4800, 4803 },
1223 { 7200, 7207 },
1224 { 9600, 9612 },
1225 { 14400, 14428 },
1226 { 16000, 16062 },
1227 { 19200, 19250 },
1228 { 28800, 28912 },
1229 { 38400, 38601 },
1230 { 51200, 51558 },
1231 { 56000, 56280 },
1232 { 57600, 58053 },
1233 { 64000, 64111 },
1234 { 76800, 77608 },
1235 { 115200, 117028 },
1236 { 128000, 129347 },
1237 { 153600, 156868 },
1238 { 230400, 237832 },
1239 { 250000, 254234 },
1240 { 256000, 273066 },
1241 { 460800, 491520 },
1242 { 500000, 567138 },
1243 { 576000, 670254 },
1244 { 921600, UINT_MAX }
1245 };
1246
1247 /*
1248 * Quantises the baud rate as per AN205 Table 1
1249 */
cp210x_get_an205_rate(speed_t baud)1250 static speed_t cp210x_get_an205_rate(speed_t baud)
1251 {
1252 int i;
1253
1254 for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) {
1255 if (baud <= cp210x_an205_table1[i].high)
1256 break;
1257 }
1258
1259 return cp210x_an205_table1[i].rate;
1260 }
1261
cp210x_get_actual_rate(speed_t baud)1262 static speed_t cp210x_get_actual_rate(speed_t baud)
1263 {
1264 unsigned int prescale = 1;
1265 unsigned int div;
1266
1267 if (baud <= 365)
1268 prescale = 4;
1269
1270 div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud);
1271 baud = 48000000 / (2 * prescale * div);
1272
1273 return baud;
1274 }
1275
1276 /*
1277 * CP2101 supports the following baud rates:
1278 *
1279 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
1280 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
1281 *
1282 * CP2102 and CP2103 support the following additional rates:
1283 *
1284 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
1285 * 576000
1286 *
1287 * The device will map a requested rate to a supported one, but the result
1288 * of requests for rates greater than 1053257 is undefined (see AN205).
1289 *
1290 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
1291 * respectively, with an error less than 1%. The actual rates are determined
1292 * by
1293 *
1294 * div = round(freq / (2 x prescale x request))
1295 * actual = freq / (2 x prescale x div)
1296 *
1297 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1298 * or 1 otherwise.
1299 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1300 * otherwise.
1301 */
cp210x_change_speed(struct tty_struct * tty,struct usb_serial_port * port,struct ktermios * old_termios)1302 static void cp210x_change_speed(struct tty_struct *tty,
1303 struct usb_serial_port *port, struct ktermios *old_termios)
1304 {
1305 struct usb_serial *serial = port->serial;
1306 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1307 u32 baud;
1308
1309 /*
1310 * This maps the requested rate to the actual rate, a valid rate on
1311 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed].
1312 *
1313 * NOTE: B0 is not implemented.
1314 */
1315 baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed);
1316
1317 if (priv->use_actual_rate)
1318 baud = cp210x_get_actual_rate(baud);
1319 else if (baud < 1000000)
1320 baud = cp210x_get_an205_rate(baud);
1321
1322 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1323 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1324 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1325 if (old_termios)
1326 baud = old_termios->c_ospeed;
1327 else
1328 baud = 9600;
1329 }
1330
1331 tty_encode_baud_rate(tty, baud, baud);
1332 }
1333
cp210x_enable_event_mode(struct usb_serial_port * port)1334 static void cp210x_enable_event_mode(struct usb_serial_port *port)
1335 {
1336 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1337 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1338 int ret;
1339
1340 if (port_priv->event_mode)
1341 return;
1342
1343 if (priv->no_event_mode)
1344 return;
1345
1346 port_priv->event_state = ES_DATA;
1347 port_priv->event_mode = true;
1348
1349 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR);
1350 if (ret) {
1351 dev_err(&port->dev, "failed to enable events: %d\n", ret);
1352 port_priv->event_mode = false;
1353 }
1354 }
1355
cp210x_disable_event_mode(struct usb_serial_port * port)1356 static void cp210x_disable_event_mode(struct usb_serial_port *port)
1357 {
1358 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1359 int ret;
1360
1361 if (!port_priv->event_mode)
1362 return;
1363
1364 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0);
1365 if (ret) {
1366 dev_err(&port->dev, "failed to disable events: %d\n", ret);
1367 return;
1368 }
1369
1370 port_priv->event_mode = false;
1371 }
1372
cp210x_set_termios(struct tty_struct * tty,struct usb_serial_port * port,struct ktermios * old_termios)1373 static void cp210x_set_termios(struct tty_struct *tty,
1374 struct usb_serial_port *port, struct ktermios *old_termios)
1375 {
1376 struct device *dev = &port->dev;
1377 unsigned int cflag, old_cflag;
1378 u16 bits;
1379
1380 cflag = tty->termios.c_cflag;
1381 old_cflag = old_termios->c_cflag;
1382
1383 if (tty->termios.c_ospeed != old_termios->c_ospeed)
1384 cp210x_change_speed(tty, port, old_termios);
1385
1386 /* If the number of data bits is to be updated */
1387 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
1388 cp210x_get_line_ctl(port, &bits);
1389 bits &= ~BITS_DATA_MASK;
1390 switch (cflag & CSIZE) {
1391 case CS5:
1392 bits |= BITS_DATA_5;
1393 dev_dbg(dev, "%s - data bits = 5\n", __func__);
1394 break;
1395 case CS6:
1396 bits |= BITS_DATA_6;
1397 dev_dbg(dev, "%s - data bits = 6\n", __func__);
1398 break;
1399 case CS7:
1400 bits |= BITS_DATA_7;
1401 dev_dbg(dev, "%s - data bits = 7\n", __func__);
1402 break;
1403 case CS8:
1404 default:
1405 bits |= BITS_DATA_8;
1406 dev_dbg(dev, "%s - data bits = 8\n", __func__);
1407 break;
1408 }
1409 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1410 dev_dbg(dev, "Number of data bits requested not supported by device\n");
1411 }
1412
1413 if ((cflag & (PARENB|PARODD|CMSPAR)) !=
1414 (old_cflag & (PARENB|PARODD|CMSPAR))) {
1415 cp210x_get_line_ctl(port, &bits);
1416 bits &= ~BITS_PARITY_MASK;
1417 if (cflag & PARENB) {
1418 if (cflag & CMSPAR) {
1419 if (cflag & PARODD) {
1420 bits |= BITS_PARITY_MARK;
1421 dev_dbg(dev, "%s - parity = MARK\n", __func__);
1422 } else {
1423 bits |= BITS_PARITY_SPACE;
1424 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
1425 }
1426 } else {
1427 if (cflag & PARODD) {
1428 bits |= BITS_PARITY_ODD;
1429 dev_dbg(dev, "%s - parity = ODD\n", __func__);
1430 } else {
1431 bits |= BITS_PARITY_EVEN;
1432 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
1433 }
1434 }
1435 }
1436 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1437 dev_dbg(dev, "Parity mode not supported by device\n");
1438 }
1439
1440 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
1441 cp210x_get_line_ctl(port, &bits);
1442 bits &= ~BITS_STOP_MASK;
1443 if (cflag & CSTOPB) {
1444 bits |= BITS_STOP_2;
1445 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1446 } else {
1447 bits |= BITS_STOP_1;
1448 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
1449 }
1450 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1451 dev_dbg(dev, "Number of stop bits requested not supported by device\n");
1452 }
1453
1454 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
1455 struct cp210x_flow_ctl flow_ctl;
1456 u32 ctl_hs;
1457 u32 flow_repl;
1458
1459 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1460 sizeof(flow_ctl));
1461 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1462 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1463 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1464 __func__, ctl_hs, flow_repl);
1465
1466 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1467 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1468 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1469 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1470 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE);
1471 if (cflag & CRTSCTS) {
1472 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1473
1474 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1475 flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1476 CP210X_SERIAL_RTS_FLOW_CTL);
1477 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1478 } else {
1479 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1480
1481 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1482 flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1483 CP210X_SERIAL_RTS_ACTIVE);
1484 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1485 }
1486
1487 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1488 __func__, ctl_hs, flow_repl);
1489 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1490 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1491 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1492 sizeof(flow_ctl));
1493 }
1494
1495 /*
1496 * Enable event-insertion mode only if input parity checking is
1497 * enabled for now.
1498 */
1499 if (I_INPCK(tty))
1500 cp210x_enable_event_mode(port);
1501 else
1502 cp210x_disable_event_mode(port);
1503 }
1504
cp210x_tiocmset(struct tty_struct * tty,unsigned int set,unsigned int clear)1505 static int cp210x_tiocmset(struct tty_struct *tty,
1506 unsigned int set, unsigned int clear)
1507 {
1508 struct usb_serial_port *port = tty->driver_data;
1509 return cp210x_tiocmset_port(port, set, clear);
1510 }
1511
cp210x_tiocmset_port(struct usb_serial_port * port,unsigned int set,unsigned int clear)1512 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1513 unsigned int set, unsigned int clear)
1514 {
1515 u16 control = 0;
1516
1517 if (set & TIOCM_RTS) {
1518 control |= CONTROL_RTS;
1519 control |= CONTROL_WRITE_RTS;
1520 }
1521 if (set & TIOCM_DTR) {
1522 control |= CONTROL_DTR;
1523 control |= CONTROL_WRITE_DTR;
1524 }
1525 if (clear & TIOCM_RTS) {
1526 control &= ~CONTROL_RTS;
1527 control |= CONTROL_WRITE_RTS;
1528 }
1529 if (clear & TIOCM_DTR) {
1530 control &= ~CONTROL_DTR;
1531 control |= CONTROL_WRITE_DTR;
1532 }
1533
1534 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
1535
1536 return cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1537 }
1538
cp210x_dtr_rts(struct usb_serial_port * p,int on)1539 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
1540 {
1541 if (on)
1542 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
1543 else
1544 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
1545 }
1546
cp210x_tiocmget(struct tty_struct * tty)1547 static int cp210x_tiocmget(struct tty_struct *tty)
1548 {
1549 struct usb_serial_port *port = tty->driver_data;
1550 u8 control;
1551 int result;
1552
1553 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1554 if (result)
1555 return result;
1556
1557 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1558 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1559 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1560 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1561 |((control & CONTROL_RING)? TIOCM_RI : 0)
1562 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
1563
1564 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
1565
1566 return result;
1567 }
1568
cp210x_break_ctl(struct tty_struct * tty,int break_state)1569 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1570 {
1571 struct usb_serial_port *port = tty->driver_data;
1572 u16 state;
1573
1574 if (break_state == 0)
1575 state = BREAK_OFF;
1576 else
1577 state = BREAK_ON;
1578 dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1579 state == BREAK_OFF ? "off" : "on");
1580 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1581 }
1582
1583 #ifdef CONFIG_GPIOLIB
cp210x_gpio_request(struct gpio_chip * gc,unsigned int offset)1584 static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset)
1585 {
1586 struct usb_serial *serial = gpiochip_get_data(gc);
1587 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1588
1589 if (priv->gpio_altfunc & BIT(offset))
1590 return -ENODEV;
1591
1592 return 0;
1593 }
1594
cp210x_gpio_get(struct gpio_chip * gc,unsigned int gpio)1595 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1596 {
1597 struct usb_serial *serial = gpiochip_get_data(gc);
1598 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1599 u8 req_type = REQTYPE_DEVICE_TO_HOST;
1600 int result;
1601 u8 buf;
1602
1603 if (priv->partnum == CP210X_PARTNUM_CP2105)
1604 req_type = REQTYPE_INTERFACE_TO_HOST;
1605
1606 result = usb_autopm_get_interface(serial->interface);
1607 if (result)
1608 return result;
1609
1610 result = cp210x_read_vendor_block(serial, req_type,
1611 CP210X_READ_LATCH, &buf, sizeof(buf));
1612 usb_autopm_put_interface(serial->interface);
1613 if (result < 0)
1614 return result;
1615
1616 return !!(buf & BIT(gpio));
1617 }
1618
cp210x_gpio_set(struct gpio_chip * gc,unsigned int gpio,int value)1619 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1620 {
1621 struct usb_serial *serial = gpiochip_get_data(gc);
1622 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1623 struct cp210x_gpio_write buf;
1624 int result;
1625
1626 if (value == 1)
1627 buf.state = BIT(gpio);
1628 else
1629 buf.state = 0;
1630
1631 buf.mask = BIT(gpio);
1632
1633 result = usb_autopm_get_interface(serial->interface);
1634 if (result)
1635 goto out;
1636
1637 if (priv->partnum == CP210X_PARTNUM_CP2105) {
1638 result = cp210x_write_vendor_block(serial,
1639 REQTYPE_HOST_TO_INTERFACE,
1640 CP210X_WRITE_LATCH, &buf,
1641 sizeof(buf));
1642 } else {
1643 u16 wIndex = buf.state << 8 | buf.mask;
1644
1645 result = usb_control_msg(serial->dev,
1646 usb_sndctrlpipe(serial->dev, 0),
1647 CP210X_VENDOR_SPECIFIC,
1648 REQTYPE_HOST_TO_DEVICE,
1649 CP210X_WRITE_LATCH,
1650 wIndex,
1651 NULL, 0, USB_CTRL_SET_TIMEOUT);
1652 }
1653
1654 usb_autopm_put_interface(serial->interface);
1655 out:
1656 if (result < 0) {
1657 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n",
1658 result);
1659 }
1660 }
1661
cp210x_gpio_direction_get(struct gpio_chip * gc,unsigned int gpio)1662 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1663 {
1664 struct usb_serial *serial = gpiochip_get_data(gc);
1665 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1666
1667 return priv->gpio_input & BIT(gpio);
1668 }
1669
cp210x_gpio_direction_input(struct gpio_chip * gc,unsigned int gpio)1670 static int cp210x_gpio_direction_input(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 if (priv->partnum == CP210X_PARTNUM_CP2105) {
1676 /* hardware does not support an input mode */
1677 return -ENOTSUPP;
1678 }
1679
1680 /* push-pull pins cannot be changed to be inputs */
1681 if (priv->gpio_pushpull & BIT(gpio))
1682 return -EINVAL;
1683
1684 /* make sure to release pin if it is being driven low */
1685 cp210x_gpio_set(gc, gpio, 1);
1686
1687 priv->gpio_input |= BIT(gpio);
1688
1689 return 0;
1690 }
1691
cp210x_gpio_direction_output(struct gpio_chip * gc,unsigned int gpio,int value)1692 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1693 int value)
1694 {
1695 struct usb_serial *serial = gpiochip_get_data(gc);
1696 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1697
1698 priv->gpio_input &= ~BIT(gpio);
1699 cp210x_gpio_set(gc, gpio, value);
1700
1701 return 0;
1702 }
1703
cp210x_gpio_set_config(struct gpio_chip * gc,unsigned int gpio,unsigned long config)1704 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
1705 unsigned long config)
1706 {
1707 struct usb_serial *serial = gpiochip_get_data(gc);
1708 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1709 enum pin_config_param param = pinconf_to_config_param(config);
1710
1711 /* Succeed only if in correct mode (this can't be set at runtime) */
1712 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) &&
1713 (priv->gpio_pushpull & BIT(gpio)))
1714 return 0;
1715
1716 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) &&
1717 !(priv->gpio_pushpull & BIT(gpio)))
1718 return 0;
1719
1720 return -ENOTSUPP;
1721 }
1722
1723 /*
1724 * This function is for configuring GPIO using shared pins, where other signals
1725 * are made unavailable by configuring the use of GPIO. This is believed to be
1726 * only applicable to the cp2105 at this point, the other devices supported by
1727 * this driver that provide GPIO do so in a way that does not impact other
1728 * signals and are thus expected to have very different initialisation.
1729 */
cp2105_gpioconf_init(struct usb_serial * serial)1730 static int cp2105_gpioconf_init(struct usb_serial *serial)
1731 {
1732 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1733 struct cp210x_pin_mode mode;
1734 struct cp210x_dual_port_config config;
1735 u8 intf_num = cp210x_interface_num(serial);
1736 u8 iface_config;
1737 int result;
1738
1739 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1740 CP210X_GET_DEVICEMODE, &mode,
1741 sizeof(mode));
1742 if (result < 0)
1743 return result;
1744
1745 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1746 CP210X_GET_PORTCONFIG, &config,
1747 sizeof(config));
1748 if (result < 0)
1749 return result;
1750
1751 /* 2 banks of GPIO - One for the pins taken from each serial port */
1752 if (intf_num == 0) {
1753 priv->gc.ngpio = 2;
1754
1755 if (mode.eci == CP210X_PIN_MODE_MODEM) {
1756 /* mark all GPIOs of this interface as reserved */
1757 priv->gpio_altfunc = 0xff;
1758 return 0;
1759 }
1760
1761 iface_config = config.eci_cfg;
1762 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1763 CP210X_ECI_GPIO_MODE_MASK) >>
1764 CP210X_ECI_GPIO_MODE_OFFSET);
1765 } else if (intf_num == 1) {
1766 priv->gc.ngpio = 3;
1767
1768 if (mode.sci == CP210X_PIN_MODE_MODEM) {
1769 /* mark all GPIOs of this interface as reserved */
1770 priv->gpio_altfunc = 0xff;
1771 return 0;
1772 }
1773
1774 iface_config = config.sci_cfg;
1775 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1776 CP210X_SCI_GPIO_MODE_MASK) >>
1777 CP210X_SCI_GPIO_MODE_OFFSET);
1778 } else {
1779 return -ENODEV;
1780 }
1781
1782 /* mark all pins which are not in GPIO mode */
1783 if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */
1784 priv->gpio_altfunc |= BIT(0);
1785 if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */
1786 CP2105_GPIO1_RS485_MODE))
1787 priv->gpio_altfunc |= BIT(1);
1788
1789 /* driver implementation for CP2105 only supports outputs */
1790 priv->gpio_input = 0;
1791
1792 return 0;
1793 }
1794
cp2104_gpioconf_init(struct usb_serial * serial)1795 static int cp2104_gpioconf_init(struct usb_serial *serial)
1796 {
1797 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1798 struct cp210x_single_port_config config;
1799 u8 iface_config;
1800 u8 gpio_latch;
1801 int result;
1802 u8 i;
1803
1804 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1805 CP210X_GET_PORTCONFIG, &config,
1806 sizeof(config));
1807 if (result < 0)
1808 return result;
1809
1810 priv->gc.ngpio = 4;
1811
1812 iface_config = config.device_cfg;
1813 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1814 CP210X_GPIO_MODE_MASK) >>
1815 CP210X_GPIO_MODE_OFFSET);
1816 gpio_latch = (u8)((le16_to_cpu(config.reset_state) &
1817 CP210X_GPIO_MODE_MASK) >>
1818 CP210X_GPIO_MODE_OFFSET);
1819
1820 /* mark all pins which are not in GPIO mode */
1821 if (iface_config & CP2104_GPIO0_TXLED_MODE) /* GPIO 0 */
1822 priv->gpio_altfunc |= BIT(0);
1823 if (iface_config & CP2104_GPIO1_RXLED_MODE) /* GPIO 1 */
1824 priv->gpio_altfunc |= BIT(1);
1825 if (iface_config & CP2104_GPIO2_RS485_MODE) /* GPIO 2 */
1826 priv->gpio_altfunc |= BIT(2);
1827
1828 /*
1829 * Like CP2102N, CP2104 has also no strict input and output pin
1830 * modes.
1831 * Do the same input mode emulation as CP2102N.
1832 */
1833 for (i = 0; i < priv->gc.ngpio; ++i) {
1834 /*
1835 * Set direction to "input" iff pin is open-drain and reset
1836 * value is 1.
1837 */
1838 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1839 priv->gpio_input |= BIT(i);
1840 }
1841
1842 return 0;
1843 }
1844
cp2102n_gpioconf_init(struct usb_serial * serial)1845 static int cp2102n_gpioconf_init(struct usb_serial *serial)
1846 {
1847 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1848 const u16 config_size = 0x02a6;
1849 u8 gpio_rst_latch;
1850 u8 config_version;
1851 u8 gpio_pushpull;
1852 u8 *config_buf;
1853 u8 gpio_latch;
1854 u8 gpio_ctrl;
1855 int result;
1856 u8 i;
1857
1858 /*
1859 * Retrieve device configuration from the device.
1860 * The array received contains all customization settings done at the
1861 * factory/manufacturer. Format of the array is documented at the
1862 * time of writing at:
1863 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa
1864 */
1865 config_buf = kmalloc(config_size, GFP_KERNEL);
1866 if (!config_buf)
1867 return -ENOMEM;
1868
1869 result = cp210x_read_vendor_block(serial,
1870 REQTYPE_DEVICE_TO_HOST,
1871 CP210X_READ_2NCONFIG,
1872 config_buf,
1873 config_size);
1874 if (result < 0) {
1875 kfree(config_buf);
1876 return result;
1877 }
1878
1879 config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX];
1880 gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX];
1881 gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX];
1882 gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX];
1883
1884 kfree(config_buf);
1885
1886 /* Make sure this is a config format we understand. */
1887 if (config_version != 0x01)
1888 return -ENOTSUPP;
1889
1890 priv->gc.ngpio = 4;
1891
1892 /*
1893 * Get default pin states after reset. Needed so we can determine
1894 * the direction of an open-drain pin.
1895 */
1896 gpio_latch = (gpio_rst_latch >> 3) & 0x0f;
1897
1898 /* 0 indicates open-drain mode, 1 is push-pull */
1899 priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f;
1900
1901 /* 0 indicates GPIO mode, 1 is alternate function */
1902 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN20) {
1903 /* QFN20 is special... */
1904 if (gpio_ctrl & CP2102N_QFN20_GPIO0_CLK_MODE) /* GPIO 0 */
1905 priv->gpio_altfunc |= BIT(0);
1906 if (gpio_ctrl & CP2102N_QFN20_GPIO1_RS485_MODE) /* GPIO 1 */
1907 priv->gpio_altfunc |= BIT(1);
1908 if (gpio_ctrl & CP2102N_QFN20_GPIO2_TXLED_MODE) /* GPIO 2 */
1909 priv->gpio_altfunc |= BIT(2);
1910 if (gpio_ctrl & CP2102N_QFN20_GPIO3_RXLED_MODE) /* GPIO 3 */
1911 priv->gpio_altfunc |= BIT(3);
1912 } else {
1913 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f;
1914 }
1915
1916 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) {
1917 /*
1918 * For the QFN28 package, GPIO4-6 are controlled by
1919 * the low three bits of the mode/latch fields.
1920 * Contrary to the document linked above, the bits for
1921 * the SUSPEND pins are elsewhere. No alternate
1922 * function is available for these pins.
1923 */
1924 priv->gc.ngpio = 7;
1925 gpio_latch |= (gpio_rst_latch & 7) << 4;
1926 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4;
1927 }
1928
1929 /*
1930 * The CP2102N does not strictly has input and output pin modes,
1931 * it only knows open-drain and push-pull modes which is set at
1932 * factory. An open-drain pin can function both as an
1933 * input or an output. We emulate input mode for open-drain pins
1934 * by making sure they are not driven low, and we do not allow
1935 * push-pull pins to be set as an input.
1936 */
1937 for (i = 0; i < priv->gc.ngpio; ++i) {
1938 /*
1939 * Set direction to "input" iff pin is open-drain and reset
1940 * value is 1.
1941 */
1942 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1943 priv->gpio_input |= BIT(i);
1944 }
1945
1946 return 0;
1947 }
1948
cp210x_gpio_init(struct usb_serial * serial)1949 static int cp210x_gpio_init(struct usb_serial *serial)
1950 {
1951 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1952 int result;
1953
1954 switch (priv->partnum) {
1955 case CP210X_PARTNUM_CP2104:
1956 result = cp2104_gpioconf_init(serial);
1957 break;
1958 case CP210X_PARTNUM_CP2105:
1959 result = cp2105_gpioconf_init(serial);
1960 break;
1961 case CP210X_PARTNUM_CP2102N_QFN28:
1962 case CP210X_PARTNUM_CP2102N_QFN24:
1963 case CP210X_PARTNUM_CP2102N_QFN20:
1964 result = cp2102n_gpioconf_init(serial);
1965 break;
1966 default:
1967 return 0;
1968 }
1969
1970 if (result < 0)
1971 return result;
1972
1973 priv->gc.label = "cp210x";
1974 priv->gc.request = cp210x_gpio_request;
1975 priv->gc.get_direction = cp210x_gpio_direction_get;
1976 priv->gc.direction_input = cp210x_gpio_direction_input;
1977 priv->gc.direction_output = cp210x_gpio_direction_output;
1978 priv->gc.get = cp210x_gpio_get;
1979 priv->gc.set = cp210x_gpio_set;
1980 priv->gc.set_config = cp210x_gpio_set_config;
1981 priv->gc.owner = THIS_MODULE;
1982 priv->gc.parent = &serial->interface->dev;
1983 priv->gc.base = -1;
1984 priv->gc.can_sleep = true;
1985
1986 result = gpiochip_add_data(&priv->gc, serial);
1987 if (!result)
1988 priv->gpio_registered = true;
1989
1990 return result;
1991 }
1992
cp210x_gpio_remove(struct usb_serial * serial)1993 static void cp210x_gpio_remove(struct usb_serial *serial)
1994 {
1995 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1996
1997 if (priv->gpio_registered) {
1998 gpiochip_remove(&priv->gc);
1999 priv->gpio_registered = false;
2000 }
2001 }
2002
2003 #else
2004
cp210x_gpio_init(struct usb_serial * serial)2005 static int cp210x_gpio_init(struct usb_serial *serial)
2006 {
2007 return 0;
2008 }
2009
cp210x_gpio_remove(struct usb_serial * serial)2010 static void cp210x_gpio_remove(struct usb_serial *serial)
2011 {
2012 /* Nothing to do */
2013 }
2014
2015 #endif
2016
cp210x_port_probe(struct usb_serial_port * port)2017 static int cp210x_port_probe(struct usb_serial_port *port)
2018 {
2019 struct usb_serial *serial = port->serial;
2020 struct cp210x_port_private *port_priv;
2021 int ret;
2022
2023 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
2024 if (!port_priv)
2025 return -ENOMEM;
2026
2027 port_priv->bInterfaceNumber = cp210x_interface_num(serial);
2028
2029 usb_set_serial_port_data(port, port_priv);
2030
2031 ret = cp210x_detect_swapped_line_ctl(port);
2032 if (ret) {
2033 kfree(port_priv);
2034 return ret;
2035 }
2036
2037 return 0;
2038 }
2039
cp210x_port_remove(struct usb_serial_port * port)2040 static int cp210x_port_remove(struct usb_serial_port *port)
2041 {
2042 struct cp210x_port_private *port_priv;
2043
2044 port_priv = usb_get_serial_port_data(port);
2045 kfree(port_priv);
2046
2047 return 0;
2048 }
2049
cp210x_init_max_speed(struct usb_serial * serial)2050 static void cp210x_init_max_speed(struct usb_serial *serial)
2051 {
2052 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2053 bool use_actual_rate = false;
2054 speed_t min = 300;
2055 speed_t max;
2056
2057 switch (priv->partnum) {
2058 case CP210X_PARTNUM_CP2101:
2059 max = 921600;
2060 break;
2061 case CP210X_PARTNUM_CP2102:
2062 case CP210X_PARTNUM_CP2103:
2063 max = 1000000;
2064 break;
2065 case CP210X_PARTNUM_CP2104:
2066 use_actual_rate = true;
2067 max = 2000000;
2068 break;
2069 case CP210X_PARTNUM_CP2108:
2070 max = 2000000;
2071 break;
2072 case CP210X_PARTNUM_CP2105:
2073 if (cp210x_interface_num(serial) == 0) {
2074 use_actual_rate = true;
2075 max = 2000000; /* ECI */
2076 } else {
2077 min = 2400;
2078 max = 921600; /* SCI */
2079 }
2080 break;
2081 case CP210X_PARTNUM_CP2102N_QFN28:
2082 case CP210X_PARTNUM_CP2102N_QFN24:
2083 case CP210X_PARTNUM_CP2102N_QFN20:
2084 use_actual_rate = true;
2085 max = 3000000;
2086 break;
2087 default:
2088 max = 2000000;
2089 break;
2090 }
2091
2092 priv->min_speed = min;
2093 priv->max_speed = max;
2094 priv->use_actual_rate = use_actual_rate;
2095 }
2096
cp2102_determine_quirks(struct usb_serial * serial)2097 static void cp2102_determine_quirks(struct usb_serial *serial)
2098 {
2099 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2100 u8 *buf;
2101 int ret;
2102
2103 buf = kmalloc(2, GFP_KERNEL);
2104 if (!buf)
2105 return;
2106 /*
2107 * Some (possibly counterfeit) CP2102 do not support event-insertion
2108 * mode and respond differently to malformed vendor requests.
2109 * Specifically, they return one instead of two bytes when sent a
2110 * two-byte part-number request.
2111 */
2112 ret = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2113 CP210X_VENDOR_SPECIFIC, REQTYPE_DEVICE_TO_HOST,
2114 CP210X_GET_PARTNUM, 0, buf, 2, USB_CTRL_GET_TIMEOUT);
2115 if (ret == 1) {
2116 dev_dbg(&serial->interface->dev,
2117 "device does not support event-insertion mode\n");
2118 priv->no_event_mode = true;
2119 }
2120
2121 kfree(buf);
2122 }
2123
cp210x_determine_quirks(struct usb_serial * serial)2124 static void cp210x_determine_quirks(struct usb_serial *serial)
2125 {
2126 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2127
2128 switch (priv->partnum) {
2129 case CP210X_PARTNUM_CP2102:
2130 cp2102_determine_quirks(serial);
2131 break;
2132 default:
2133 break;
2134 }
2135 }
2136
cp210x_attach(struct usb_serial * serial)2137 static int cp210x_attach(struct usb_serial *serial)
2138 {
2139 int result;
2140 struct cp210x_serial_private *priv;
2141
2142 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2143 if (!priv)
2144 return -ENOMEM;
2145
2146 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
2147 CP210X_GET_PARTNUM, &priv->partnum,
2148 sizeof(priv->partnum));
2149 if (result < 0) {
2150 dev_warn(&serial->interface->dev,
2151 "querying part number failed\n");
2152 priv->partnum = CP210X_PARTNUM_UNKNOWN;
2153 }
2154
2155 usb_set_serial_data(serial, priv);
2156
2157 cp210x_determine_quirks(serial);
2158 cp210x_init_max_speed(serial);
2159
2160 result = cp210x_gpio_init(serial);
2161 if (result < 0) {
2162 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n",
2163 result);
2164 }
2165
2166 return 0;
2167 }
2168
cp210x_disconnect(struct usb_serial * serial)2169 static void cp210x_disconnect(struct usb_serial *serial)
2170 {
2171 cp210x_gpio_remove(serial);
2172 }
2173
cp210x_release(struct usb_serial * serial)2174 static void cp210x_release(struct usb_serial *serial)
2175 {
2176 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2177
2178 cp210x_gpio_remove(serial);
2179
2180 kfree(priv);
2181 }
2182
2183 module_usb_serial_driver(serial_drivers, id_table);
2184
2185 MODULE_DESCRIPTION(DRIVER_DESC);
2186 MODULE_LICENSE("GPL v2");
2187