1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Silicon Laboratories CP210x USB to RS232 serial adaptor driver
4 *
5 * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
6 *
7 * Support to set flow control line levels using TIOCMGET and TIOCMSET
8 * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow
9 * control thanks to Munir Nassar nassarmu@real-time.com
10 *
11 */
12
13 #include <linux/kernel.h>
14 #include <linux/errno.h>
15 #include <linux/slab.h>
16 #include <linux/tty.h>
17 #include <linux/tty_flip.h>
18 #include <linux/module.h>
19 #include <linux/moduleparam.h>
20 #include <linux/usb.h>
21 #include <linux/uaccess.h>
22 #include <linux/usb/serial.h>
23 #include <linux/gpio/driver.h>
24 #include <linux/bitops.h>
25 #include <linux/mutex.h>
26
27 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
28
29 /*
30 * Function Prototypes
31 */
32 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
33 static void cp210x_close(struct usb_serial_port *);
34 static void cp210x_get_termios(struct tty_struct *, struct usb_serial_port *);
35 static void cp210x_get_termios_port(struct usb_serial_port *port,
36 tcflag_t *cflagp, unsigned int *baudp);
37 static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *,
38 struct ktermios *);
39 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
40 struct ktermios*);
41 static bool cp210x_tx_empty(struct usb_serial_port *port);
42 static int cp210x_tiocmget(struct tty_struct *);
43 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
44 static int cp210x_tiocmset_port(struct usb_serial_port *port,
45 unsigned int, unsigned int);
46 static void cp210x_break_ctl(struct tty_struct *, int);
47 static int cp210x_attach(struct usb_serial *);
48 static void cp210x_disconnect(struct usb_serial *);
49 static void cp210x_release(struct usb_serial *);
50 static int cp210x_port_probe(struct usb_serial_port *);
51 static int cp210x_port_remove(struct usb_serial_port *);
52 static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
53 static void cp210x_process_read_urb(struct urb *urb);
54 static void cp210x_enable_event_mode(struct usb_serial_port *port);
55 static void cp210x_disable_event_mode(struct usb_serial_port *port);
56
57 static const struct usb_device_id id_table[] = {
58 { USB_DEVICE(0x0404, 0x034C) }, /* NCR Retail IO Box */
59 { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */
60 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
61 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
62 { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
63 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
64 { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */
65 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
66 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
67 { USB_DEVICE(0x0908, 0x0070) }, /* Siemens SCALANCE LPE-9000 USB Serial Console */
68 { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */
69 { USB_DEVICE(0x0988, 0x0578) }, /* Teraoka AD2000 */
70 { USB_DEVICE(0x0B00, 0x3070) }, /* Ingenico 3070 */
71 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
72 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
73 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
74 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
75 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
76 { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */
77 { USB_DEVICE(0x106F, 0x0003) }, /* CPI / Money Controls Bulk Coin Recycler */
78 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
79 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
80 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
81 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
82 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
83 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
84 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
85 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
86 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
87 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
88 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
89 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
90 { USB_DEVICE(0x10C4, 0x8056) }, /* Lorenz Messtechnik devices */
91 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
92 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
93 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
94 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
95 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
96 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
97 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
98 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
99 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
100 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
101 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
102 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
103 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
104 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
105 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
106 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
107 { USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */
108 { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */
109 { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */
110 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
111 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
112 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
113 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
114 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
115 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
116 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
117 { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */
118 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
119 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
120 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
121 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
122 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
123 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
124 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
125 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */
126 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
127 { USB_DEVICE(0x10C4, 0x82AA) }, /* Silicon Labs IFS-USB-DATACABLE used with Quint UPS */
128 { USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */
129 { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */
130 { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */
131 { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */
132 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
133 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
134 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
135 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
136 { USB_DEVICE(0x10C4, 0x83AA) }, /* Mark-10 Digital Force Gauge */
137 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
138 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
139 { USB_DEVICE(0x10C4, 0x8414) }, /* Decagon USB Cable Adapter */
140 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
141 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
142 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */
143 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
144 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
145 { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */
146 { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */
147 { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */
148 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
149 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
150 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
151 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
152 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
153 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
154 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
155 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
156 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
157 { USB_DEVICE(0x10C4, 0x88D8) }, /* Acuity Brands nLight Air Adapter */
158 { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */
159 { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */
160 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
161 { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */
162 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
163 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
164 { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */
165 { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */
166 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
167 { USB_DEVICE(0x10C4, 0x8A5B) }, /* CEL EM3588 ZigBee USB Stick */
168 { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */
169 { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */
170 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
171 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
172 { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */
173 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
174 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
175 { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */
176 { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */
177 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
178 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
179 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
180 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
181 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
182 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
183 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
184 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
185 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
186 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
187 { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */
188 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
189 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
190 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
191 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
192 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
193 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
194 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
195 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
196 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
197 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
198 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
199 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
200 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
201 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
202 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
203 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
204 { USB_DEVICE(0x17A8, 0x0011) }, /* Kamstrup 444 MHz RF sniffer */
205 { USB_DEVICE(0x17A8, 0x0013) }, /* Kamstrup 870 MHz RF sniffer */
206 { USB_DEVICE(0x17A8, 0x0101) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Int Ant) */
207 { USB_DEVICE(0x17A8, 0x0102) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Ext Ant) */
208 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
209 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
210 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
211 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
212 { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */
213 { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */
214 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
215 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
216 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
217 { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */
218 { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */
219 { USB_DEVICE(0x1901, 0x0197) }, /* GE CS1000 M.2 Key E serial interface */
220 { USB_DEVICE(0x1901, 0x0198) }, /* GE CS1000 Display serial interface */
221 { USB_DEVICE(0x199B, 0xBA30) }, /* LORD WSDA-200-USB */
222 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
223 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
224 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
225 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
226 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
227 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
228 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
229 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
230 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
231 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
232 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
233 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
234 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
235 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
236 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
237 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
238 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
239 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
240 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
241 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
242 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
243 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
244 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
245 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
246 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
247 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
248 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
249 { USB_DEVICE(0x2184, 0x0030) }, /* GW Instek GDM-834x Digital Multimeter */
250 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
251 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
252 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
253 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
254 { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */
255 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
256 { } /* Terminating Entry */
257 };
258
259 MODULE_DEVICE_TABLE(usb, id_table);
260
261 struct cp210x_serial_private {
262 #ifdef CONFIG_GPIOLIB
263 struct gpio_chip gc;
264 bool gpio_registered;
265 u8 gpio_pushpull;
266 u8 gpio_altfunc;
267 u8 gpio_input;
268 #endif
269 u8 partnum;
270 speed_t min_speed;
271 speed_t max_speed;
272 bool use_actual_rate;
273 bool no_event_mode;
274 };
275
276 enum cp210x_event_state {
277 ES_DATA,
278 ES_ESCAPE,
279 ES_LSR,
280 ES_LSR_DATA_0,
281 ES_LSR_DATA_1,
282 ES_MSR
283 };
284
285 struct cp210x_port_private {
286 u8 bInterfaceNumber;
287 bool has_swapped_line_ctl;
288 bool event_mode;
289 enum cp210x_event_state event_state;
290 u8 lsr;
291 };
292
293 static struct usb_serial_driver cp210x_device = {
294 .driver = {
295 .owner = THIS_MODULE,
296 .name = "cp210x",
297 },
298 .id_table = id_table,
299 .num_ports = 1,
300 .bulk_in_size = 256,
301 .bulk_out_size = 256,
302 .open = cp210x_open,
303 .close = cp210x_close,
304 .break_ctl = cp210x_break_ctl,
305 .set_termios = cp210x_set_termios,
306 .tx_empty = cp210x_tx_empty,
307 .throttle = usb_serial_generic_throttle,
308 .unthrottle = usb_serial_generic_unthrottle,
309 .tiocmget = cp210x_tiocmget,
310 .tiocmset = cp210x_tiocmset,
311 .get_icount = usb_serial_generic_get_icount,
312 .attach = cp210x_attach,
313 .disconnect = cp210x_disconnect,
314 .release = cp210x_release,
315 .port_probe = cp210x_port_probe,
316 .port_remove = cp210x_port_remove,
317 .dtr_rts = cp210x_dtr_rts,
318 .process_read_urb = cp210x_process_read_urb,
319 };
320
321 static struct usb_serial_driver * const serial_drivers[] = {
322 &cp210x_device, NULL
323 };
324
325 /* Config request types */
326 #define REQTYPE_HOST_TO_INTERFACE 0x41
327 #define REQTYPE_INTERFACE_TO_HOST 0xc1
328 #define REQTYPE_HOST_TO_DEVICE 0x40
329 #define REQTYPE_DEVICE_TO_HOST 0xc0
330
331 /* Config request codes */
332 #define CP210X_IFC_ENABLE 0x00
333 #define CP210X_SET_BAUDDIV 0x01
334 #define CP210X_GET_BAUDDIV 0x02
335 #define CP210X_SET_LINE_CTL 0x03
336 #define CP210X_GET_LINE_CTL 0x04
337 #define CP210X_SET_BREAK 0x05
338 #define CP210X_IMM_CHAR 0x06
339 #define CP210X_SET_MHS 0x07
340 #define CP210X_GET_MDMSTS 0x08
341 #define CP210X_SET_XON 0x09
342 #define CP210X_SET_XOFF 0x0A
343 #define CP210X_SET_EVENTMASK 0x0B
344 #define CP210X_GET_EVENTMASK 0x0C
345 #define CP210X_SET_CHAR 0x0D
346 #define CP210X_GET_CHARS 0x0E
347 #define CP210X_GET_PROPS 0x0F
348 #define CP210X_GET_COMM_STATUS 0x10
349 #define CP210X_RESET 0x11
350 #define CP210X_PURGE 0x12
351 #define CP210X_SET_FLOW 0x13
352 #define CP210X_GET_FLOW 0x14
353 #define CP210X_EMBED_EVENTS 0x15
354 #define CP210X_GET_EVENTSTATE 0x16
355 #define CP210X_SET_CHARS 0x19
356 #define CP210X_GET_BAUDRATE 0x1D
357 #define CP210X_SET_BAUDRATE 0x1E
358 #define CP210X_VENDOR_SPECIFIC 0xFF
359
360 /* CP210X_IFC_ENABLE */
361 #define UART_ENABLE 0x0001
362 #define UART_DISABLE 0x0000
363
364 /* CP210X_(SET|GET)_BAUDDIV */
365 #define BAUD_RATE_GEN_FREQ 0x384000
366
367 /* CP210X_(SET|GET)_LINE_CTL */
368 #define BITS_DATA_MASK 0X0f00
369 #define BITS_DATA_5 0X0500
370 #define BITS_DATA_6 0X0600
371 #define BITS_DATA_7 0X0700
372 #define BITS_DATA_8 0X0800
373 #define BITS_DATA_9 0X0900
374
375 #define BITS_PARITY_MASK 0x00f0
376 #define BITS_PARITY_NONE 0x0000
377 #define BITS_PARITY_ODD 0x0010
378 #define BITS_PARITY_EVEN 0x0020
379 #define BITS_PARITY_MARK 0x0030
380 #define BITS_PARITY_SPACE 0x0040
381
382 #define BITS_STOP_MASK 0x000f
383 #define BITS_STOP_1 0x0000
384 #define BITS_STOP_1_5 0x0001
385 #define BITS_STOP_2 0x0002
386
387 /* CP210X_SET_BREAK */
388 #define BREAK_ON 0x0001
389 #define BREAK_OFF 0x0000
390
391 /* CP210X_(SET_MHS|GET_MDMSTS) */
392 #define CONTROL_DTR 0x0001
393 #define CONTROL_RTS 0x0002
394 #define CONTROL_CTS 0x0010
395 #define CONTROL_DSR 0x0020
396 #define CONTROL_RING 0x0040
397 #define CONTROL_DCD 0x0080
398 #define CONTROL_WRITE_DTR 0x0100
399 #define CONTROL_WRITE_RTS 0x0200
400
401 /* CP210X_VENDOR_SPECIFIC values */
402 #define CP210X_READ_2NCONFIG 0x000E
403 #define CP210X_READ_LATCH 0x00C2
404 #define CP210X_GET_PARTNUM 0x370B
405 #define CP210X_GET_PORTCONFIG 0x370C
406 #define CP210X_GET_DEVICEMODE 0x3711
407 #define CP210X_WRITE_LATCH 0x37E1
408
409 /* Part number definitions */
410 #define CP210X_PARTNUM_CP2101 0x01
411 #define CP210X_PARTNUM_CP2102 0x02
412 #define CP210X_PARTNUM_CP2103 0x03
413 #define CP210X_PARTNUM_CP2104 0x04
414 #define CP210X_PARTNUM_CP2105 0x05
415 #define CP210X_PARTNUM_CP2108 0x08
416 #define CP210X_PARTNUM_CP2102N_QFN28 0x20
417 #define CP210X_PARTNUM_CP2102N_QFN24 0x21
418 #define CP210X_PARTNUM_CP2102N_QFN20 0x22
419 #define CP210X_PARTNUM_UNKNOWN 0xFF
420
421 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
422 struct cp210x_comm_status {
423 __le32 ulErrors;
424 __le32 ulHoldReasons;
425 __le32 ulAmountInInQueue;
426 __le32 ulAmountInOutQueue;
427 u8 bEofReceived;
428 u8 bWaitForImmediate;
429 u8 bReserved;
430 } __packed;
431
432 /*
433 * CP210X_PURGE - 16 bits passed in wValue of USB request.
434 * SiLabs app note AN571 gives a strange description of the 4 bits:
435 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
436 * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
437 */
438 #define PURGE_ALL 0x000f
439
440 /* CP210X_EMBED_EVENTS */
441 #define CP210X_ESCCHAR 0xec
442
443 #define CP210X_LSR_OVERRUN BIT(1)
444 #define CP210X_LSR_PARITY BIT(2)
445 #define CP210X_LSR_FRAME BIT(3)
446 #define CP210X_LSR_BREAK BIT(4)
447
448
449 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
450 struct cp210x_flow_ctl {
451 __le32 ulControlHandshake;
452 __le32 ulFlowReplace;
453 __le32 ulXonLimit;
454 __le32 ulXoffLimit;
455 };
456
457 /* cp210x_flow_ctl::ulControlHandshake */
458 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0)
459 #define CP210X_SERIAL_DTR_SHIFT(_mode) (_mode)
460 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3)
461 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4)
462 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5)
463 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6)
464
465 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */
466 #define CP210X_SERIAL_DTR_INACTIVE 0
467 #define CP210X_SERIAL_DTR_ACTIVE 1
468 #define CP210X_SERIAL_DTR_FLOW_CTL 2
469
470 /* cp210x_flow_ctl::ulFlowReplace */
471 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0)
472 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1)
473 #define CP210X_SERIAL_ERROR_CHAR BIT(2)
474 #define CP210X_SERIAL_NULL_STRIPPING BIT(3)
475 #define CP210X_SERIAL_BREAK_CHAR BIT(4)
476 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6)
477 #define CP210X_SERIAL_RTS_SHIFT(_mode) (_mode << 6)
478 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31)
479
480 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */
481 #define CP210X_SERIAL_RTS_INACTIVE 0
482 #define CP210X_SERIAL_RTS_ACTIVE 1
483 #define CP210X_SERIAL_RTS_FLOW_CTL 2
484
485 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
486 struct cp210x_pin_mode {
487 u8 eci;
488 u8 sci;
489 };
490
491 #define CP210X_PIN_MODE_MODEM 0
492 #define CP210X_PIN_MODE_GPIO BIT(0)
493
494 /*
495 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes
496 * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes.
497 */
498 struct cp210x_dual_port_config {
499 __le16 gpio_mode;
500 u8 __pad0[2];
501 __le16 reset_state;
502 u8 __pad1[4];
503 __le16 suspend_state;
504 u8 sci_cfg;
505 u8 eci_cfg;
506 u8 device_cfg;
507 } __packed;
508
509 /*
510 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes
511 * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes.
512 */
513 struct cp210x_single_port_config {
514 __le16 gpio_mode;
515 u8 __pad0[2];
516 __le16 reset_state;
517 u8 __pad1[4];
518 __le16 suspend_state;
519 u8 device_cfg;
520 } __packed;
521
522 /* GPIO modes */
523 #define CP210X_SCI_GPIO_MODE_OFFSET 9
524 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9)
525
526 #define CP210X_ECI_GPIO_MODE_OFFSET 2
527 #define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2)
528
529 #define CP210X_GPIO_MODE_OFFSET 8
530 #define CP210X_GPIO_MODE_MASK GENMASK(11, 8)
531
532 /* CP2105 port configuration values */
533 #define CP2105_GPIO0_TXLED_MODE BIT(0)
534 #define CP2105_GPIO1_RXLED_MODE BIT(1)
535 #define CP2105_GPIO1_RS485_MODE BIT(2)
536
537 /* CP2104 port configuration values */
538 #define CP2104_GPIO0_TXLED_MODE BIT(0)
539 #define CP2104_GPIO1_RXLED_MODE BIT(1)
540 #define CP2104_GPIO2_RS485_MODE BIT(2)
541
542 /* CP2102N configuration array indices */
543 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX 2
544 #define CP210X_2NCONFIG_GPIO_MODE_IDX 581
545 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587
546 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600
547
548 /* CP2102N QFN20 port configuration values */
549 #define CP2102N_QFN20_GPIO2_TXLED_MODE BIT(2)
550 #define CP2102N_QFN20_GPIO3_RXLED_MODE BIT(3)
551 #define CP2102N_QFN20_GPIO1_RS485_MODE BIT(4)
552 #define CP2102N_QFN20_GPIO0_CLK_MODE BIT(6)
553
554 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */
555 struct cp210x_gpio_write {
556 u8 mask;
557 u8 state;
558 };
559
560 /*
561 * Helper to get interface number when we only have struct usb_serial.
562 */
cp210x_interface_num(struct usb_serial * serial)563 static u8 cp210x_interface_num(struct usb_serial *serial)
564 {
565 struct usb_host_interface *cur_altsetting;
566
567 cur_altsetting = serial->interface->cur_altsetting;
568
569 return cur_altsetting->desc.bInterfaceNumber;
570 }
571
572 /*
573 * Reads a variable-sized block of CP210X_ registers, identified by req.
574 * Returns data into buf in native USB byte order.
575 */
cp210x_read_reg_block(struct usb_serial_port * port,u8 req,void * buf,int bufsize)576 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
577 void *buf, int bufsize)
578 {
579 struct usb_serial *serial = port->serial;
580 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
581 void *dmabuf;
582 int result;
583
584 dmabuf = kmalloc(bufsize, GFP_KERNEL);
585 if (!dmabuf) {
586 /*
587 * FIXME Some callers don't bother to check for error,
588 * at least give them consistent junk until they are fixed
589 */
590 memset(buf, 0, bufsize);
591 return -ENOMEM;
592 }
593
594 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
595 req, REQTYPE_INTERFACE_TO_HOST, 0,
596 port_priv->bInterfaceNumber, dmabuf, bufsize,
597 USB_CTRL_SET_TIMEOUT);
598 if (result == bufsize) {
599 memcpy(buf, dmabuf, bufsize);
600 result = 0;
601 } else {
602 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
603 req, bufsize, result);
604 if (result >= 0)
605 result = -EIO;
606
607 /*
608 * FIXME Some callers don't bother to check for error,
609 * at least give them consistent junk until they are fixed
610 */
611 memset(buf, 0, bufsize);
612 }
613
614 kfree(dmabuf);
615
616 return result;
617 }
618
619 /*
620 * Reads any 32-bit CP210X_ register identified by req.
621 */
cp210x_read_u32_reg(struct usb_serial_port * port,u8 req,u32 * val)622 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val)
623 {
624 __le32 le32_val;
625 int err;
626
627 err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val));
628 if (err) {
629 /*
630 * FIXME Some callers don't bother to check for error,
631 * at least give them consistent junk until they are fixed
632 */
633 *val = 0;
634 return err;
635 }
636
637 *val = le32_to_cpu(le32_val);
638
639 return 0;
640 }
641
642 /*
643 * Reads any 16-bit CP210X_ register identified by req.
644 */
cp210x_read_u16_reg(struct usb_serial_port * port,u8 req,u16 * val)645 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val)
646 {
647 __le16 le16_val;
648 int err;
649
650 err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val));
651 if (err)
652 return err;
653
654 *val = le16_to_cpu(le16_val);
655
656 return 0;
657 }
658
659 /*
660 * Reads any 8-bit CP210X_ register identified by req.
661 */
cp210x_read_u8_reg(struct usb_serial_port * port,u8 req,u8 * val)662 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
663 {
664 return cp210x_read_reg_block(port, req, val, sizeof(*val));
665 }
666
667 /*
668 * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
669 * Returns data into buf in native USB byte order.
670 */
cp210x_read_vendor_block(struct usb_serial * serial,u8 type,u16 val,void * buf,int bufsize)671 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
672 void *buf, int bufsize)
673 {
674 void *dmabuf;
675 int result;
676
677 dmabuf = kmalloc(bufsize, GFP_KERNEL);
678 if (!dmabuf)
679 return -ENOMEM;
680
681 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
682 CP210X_VENDOR_SPECIFIC, type, val,
683 cp210x_interface_num(serial), dmabuf, bufsize,
684 USB_CTRL_GET_TIMEOUT);
685 if (result == bufsize) {
686 memcpy(buf, dmabuf, bufsize);
687 result = 0;
688 } else {
689 dev_err(&serial->interface->dev,
690 "failed to get vendor val 0x%04x size %d: %d\n", val,
691 bufsize, result);
692 if (result >= 0)
693 result = -EIO;
694 }
695
696 kfree(dmabuf);
697
698 return result;
699 }
700
701 /*
702 * Writes any 16-bit CP210X_ register (req) whose value is passed
703 * entirely in the wValue field of the USB request.
704 */
cp210x_write_u16_reg(struct usb_serial_port * port,u8 req,u16 val)705 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
706 {
707 struct usb_serial *serial = port->serial;
708 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
709 int result;
710
711 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
712 req, REQTYPE_HOST_TO_INTERFACE, val,
713 port_priv->bInterfaceNumber, NULL, 0,
714 USB_CTRL_SET_TIMEOUT);
715 if (result < 0) {
716 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
717 req, result);
718 }
719
720 return result;
721 }
722
723 /*
724 * Writes a variable-sized block of CP210X_ registers, identified by req.
725 * Data in buf must be in native USB byte order.
726 */
cp210x_write_reg_block(struct usb_serial_port * port,u8 req,void * buf,int bufsize)727 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
728 void *buf, int bufsize)
729 {
730 struct usb_serial *serial = port->serial;
731 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
732 void *dmabuf;
733 int result;
734
735 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
736 if (!dmabuf)
737 return -ENOMEM;
738
739 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
740 req, REQTYPE_HOST_TO_INTERFACE, 0,
741 port_priv->bInterfaceNumber, dmabuf, bufsize,
742 USB_CTRL_SET_TIMEOUT);
743
744 kfree(dmabuf);
745
746 if (result == bufsize) {
747 result = 0;
748 } else {
749 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
750 req, bufsize, result);
751 if (result >= 0)
752 result = -EIO;
753 }
754
755 return result;
756 }
757
758 /*
759 * Writes any 32-bit CP210X_ register identified by req.
760 */
cp210x_write_u32_reg(struct usb_serial_port * port,u8 req,u32 val)761 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
762 {
763 __le32 le32_val;
764
765 le32_val = cpu_to_le32(val);
766
767 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
768 }
769
770 #ifdef CONFIG_GPIOLIB
771 /*
772 * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
773 * Data in buf must be in native USB byte order.
774 */
cp210x_write_vendor_block(struct usb_serial * serial,u8 type,u16 val,void * buf,int bufsize)775 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
776 u16 val, void *buf, int bufsize)
777 {
778 void *dmabuf;
779 int result;
780
781 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
782 if (!dmabuf)
783 return -ENOMEM;
784
785 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
786 CP210X_VENDOR_SPECIFIC, type, val,
787 cp210x_interface_num(serial), dmabuf, bufsize,
788 USB_CTRL_SET_TIMEOUT);
789
790 kfree(dmabuf);
791
792 if (result == bufsize) {
793 result = 0;
794 } else {
795 dev_err(&serial->interface->dev,
796 "failed to set vendor val 0x%04x size %d: %d\n", val,
797 bufsize, result);
798 if (result >= 0)
799 result = -EIO;
800 }
801
802 return result;
803 }
804 #endif
805
806 /*
807 * Detect CP2108 GET_LINE_CTL bug and activate workaround.
808 * Write a known good value 0x800, read it back.
809 * If it comes back swapped the bug is detected.
810 * Preserve the original register value.
811 */
cp210x_detect_swapped_line_ctl(struct usb_serial_port * port)812 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
813 {
814 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
815 u16 line_ctl_save;
816 u16 line_ctl_test;
817 int err;
818
819 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save);
820 if (err)
821 return err;
822
823 err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800);
824 if (err)
825 return err;
826
827 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test);
828 if (err)
829 return err;
830
831 if (line_ctl_test == 8) {
832 port_priv->has_swapped_line_ctl = true;
833 line_ctl_save = swab16(line_ctl_save);
834 }
835
836 return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save);
837 }
838
839 /*
840 * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL)
841 * to workaround cp2108 bug and get correct value.
842 */
cp210x_get_line_ctl(struct usb_serial_port * port,u16 * ctl)843 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl)
844 {
845 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
846 int err;
847
848 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl);
849 if (err)
850 return err;
851
852 /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
853 if (port_priv->has_swapped_line_ctl)
854 *ctl = swab16(*ctl);
855
856 return 0;
857 }
858
cp210x_open(struct tty_struct * tty,struct usb_serial_port * port)859 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
860 {
861 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
862 int result;
863
864 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
865 if (result) {
866 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
867 return result;
868 }
869
870 /* Configure the termios structure */
871 cp210x_get_termios(tty, port);
872
873 if (tty) {
874 /* The baud rate must be initialised on cp2104 */
875 cp210x_change_speed(tty, port, NULL);
876
877 if (I_INPCK(tty))
878 cp210x_enable_event_mode(port);
879 }
880
881 result = usb_serial_generic_open(tty, port);
882 if (result)
883 goto err_disable;
884
885 return 0;
886
887 err_disable:
888 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
889 port_priv->event_mode = false;
890
891 return result;
892 }
893
cp210x_close(struct usb_serial_port * port)894 static void cp210x_close(struct usb_serial_port *port)
895 {
896 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
897
898 usb_serial_generic_close(port);
899
900 /* Clear both queues; cp2108 needs this to avoid an occasional hang */
901 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
902
903 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
904
905 /* Disabling the interface disables event-insertion mode. */
906 port_priv->event_mode = false;
907 }
908
cp210x_process_lsr(struct usb_serial_port * port,unsigned char lsr,char * flag)909 static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag)
910 {
911 if (lsr & CP210X_LSR_BREAK) {
912 port->icount.brk++;
913 *flag = TTY_BREAK;
914 } else if (lsr & CP210X_LSR_PARITY) {
915 port->icount.parity++;
916 *flag = TTY_PARITY;
917 } else if (lsr & CP210X_LSR_FRAME) {
918 port->icount.frame++;
919 *flag = TTY_FRAME;
920 }
921
922 if (lsr & CP210X_LSR_OVERRUN) {
923 port->icount.overrun++;
924 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
925 }
926 }
927
cp210x_process_char(struct usb_serial_port * port,unsigned char * ch,char * flag)928 static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag)
929 {
930 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
931
932 switch (port_priv->event_state) {
933 case ES_DATA:
934 if (*ch == CP210X_ESCCHAR) {
935 port_priv->event_state = ES_ESCAPE;
936 break;
937 }
938 return false;
939 case ES_ESCAPE:
940 switch (*ch) {
941 case 0:
942 dev_dbg(&port->dev, "%s - escape char\n", __func__);
943 *ch = CP210X_ESCCHAR;
944 port_priv->event_state = ES_DATA;
945 return false;
946 case 1:
947 port_priv->event_state = ES_LSR_DATA_0;
948 break;
949 case 2:
950 port_priv->event_state = ES_LSR;
951 break;
952 case 3:
953 port_priv->event_state = ES_MSR;
954 break;
955 default:
956 dev_err(&port->dev, "malformed event 0x%02x\n", *ch);
957 port_priv->event_state = ES_DATA;
958 break;
959 }
960 break;
961 case ES_LSR_DATA_0:
962 port_priv->lsr = *ch;
963 port_priv->event_state = ES_LSR_DATA_1;
964 break;
965 case ES_LSR_DATA_1:
966 dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n",
967 __func__, port_priv->lsr, *ch);
968 cp210x_process_lsr(port, port_priv->lsr, flag);
969 port_priv->event_state = ES_DATA;
970 return false;
971 case ES_LSR:
972 dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch);
973 port_priv->lsr = *ch;
974 cp210x_process_lsr(port, port_priv->lsr, flag);
975 port_priv->event_state = ES_DATA;
976 break;
977 case ES_MSR:
978 dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch);
979 /* unimplemented */
980 port_priv->event_state = ES_DATA;
981 break;
982 }
983
984 return true;
985 }
986
cp210x_process_read_urb(struct urb * urb)987 static void cp210x_process_read_urb(struct urb *urb)
988 {
989 struct usb_serial_port *port = urb->context;
990 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
991 unsigned char *ch = urb->transfer_buffer;
992 char flag;
993 int i;
994
995 if (!urb->actual_length)
996 return;
997
998 if (port_priv->event_mode) {
999 for (i = 0; i < urb->actual_length; i++, ch++) {
1000 flag = TTY_NORMAL;
1001
1002 if (cp210x_process_char(port, ch, &flag))
1003 continue;
1004
1005 tty_insert_flip_char(&port->port, *ch, flag);
1006 }
1007 } else {
1008 tty_insert_flip_string(&port->port, ch, urb->actual_length);
1009 }
1010 tty_flip_buffer_push(&port->port);
1011 }
1012
1013 /*
1014 * Read how many bytes are waiting in the TX queue.
1015 */
cp210x_get_tx_queue_byte_count(struct usb_serial_port * port,u32 * count)1016 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
1017 u32 *count)
1018 {
1019 struct usb_serial *serial = port->serial;
1020 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1021 struct cp210x_comm_status *sts;
1022 int result;
1023
1024 sts = kmalloc(sizeof(*sts), GFP_KERNEL);
1025 if (!sts)
1026 return -ENOMEM;
1027
1028 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
1029 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
1030 0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
1031 USB_CTRL_GET_TIMEOUT);
1032 if (result == sizeof(*sts)) {
1033 *count = le32_to_cpu(sts->ulAmountInOutQueue);
1034 result = 0;
1035 } else {
1036 dev_err(&port->dev, "failed to get comm status: %d\n", result);
1037 if (result >= 0)
1038 result = -EIO;
1039 }
1040
1041 kfree(sts);
1042
1043 return result;
1044 }
1045
cp210x_tx_empty(struct usb_serial_port * port)1046 static bool cp210x_tx_empty(struct usb_serial_port *port)
1047 {
1048 int err;
1049 u32 count;
1050
1051 err = cp210x_get_tx_queue_byte_count(port, &count);
1052 if (err)
1053 return true;
1054
1055 return !count;
1056 }
1057
1058 /*
1059 * cp210x_get_termios
1060 * Reads the baud rate, data bits, parity, stop bits and flow control mode
1061 * from the device, corrects any unsupported values, and configures the
1062 * termios structure to reflect the state of the device
1063 */
cp210x_get_termios(struct tty_struct * tty,struct usb_serial_port * port)1064 static void cp210x_get_termios(struct tty_struct *tty,
1065 struct usb_serial_port *port)
1066 {
1067 unsigned int baud;
1068
1069 if (tty) {
1070 cp210x_get_termios_port(tty->driver_data,
1071 &tty->termios.c_cflag, &baud);
1072 tty_encode_baud_rate(tty, baud, baud);
1073 } else {
1074 tcflag_t cflag;
1075 cflag = 0;
1076 cp210x_get_termios_port(port, &cflag, &baud);
1077 }
1078 }
1079
1080 /*
1081 * cp210x_get_termios_port
1082 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
1083 */
cp210x_get_termios_port(struct usb_serial_port * port,tcflag_t * cflagp,unsigned int * baudp)1084 static void cp210x_get_termios_port(struct usb_serial_port *port,
1085 tcflag_t *cflagp, unsigned int *baudp)
1086 {
1087 struct device *dev = &port->dev;
1088 tcflag_t cflag;
1089 struct cp210x_flow_ctl flow_ctl;
1090 u32 baud;
1091 u16 bits;
1092 u32 ctl_hs;
1093 u32 flow_repl;
1094
1095 cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud);
1096
1097 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
1098 *baudp = baud;
1099
1100 cflag = *cflagp;
1101
1102 cp210x_get_line_ctl(port, &bits);
1103 cflag &= ~CSIZE;
1104 switch (bits & BITS_DATA_MASK) {
1105 case BITS_DATA_5:
1106 dev_dbg(dev, "%s - data bits = 5\n", __func__);
1107 cflag |= CS5;
1108 break;
1109 case BITS_DATA_6:
1110 dev_dbg(dev, "%s - data bits = 6\n", __func__);
1111 cflag |= CS6;
1112 break;
1113 case BITS_DATA_7:
1114 dev_dbg(dev, "%s - data bits = 7\n", __func__);
1115 cflag |= CS7;
1116 break;
1117 case BITS_DATA_8:
1118 dev_dbg(dev, "%s - data bits = 8\n", __func__);
1119 cflag |= CS8;
1120 break;
1121 case BITS_DATA_9:
1122 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
1123 cflag |= CS8;
1124 bits &= ~BITS_DATA_MASK;
1125 bits |= BITS_DATA_8;
1126 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1127 break;
1128 default:
1129 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
1130 cflag |= CS8;
1131 bits &= ~BITS_DATA_MASK;
1132 bits |= BITS_DATA_8;
1133 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1134 break;
1135 }
1136
1137 switch (bits & BITS_PARITY_MASK) {
1138 case BITS_PARITY_NONE:
1139 dev_dbg(dev, "%s - parity = NONE\n", __func__);
1140 cflag &= ~PARENB;
1141 break;
1142 case BITS_PARITY_ODD:
1143 dev_dbg(dev, "%s - parity = ODD\n", __func__);
1144 cflag |= (PARENB|PARODD);
1145 break;
1146 case BITS_PARITY_EVEN:
1147 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
1148 cflag &= ~PARODD;
1149 cflag |= PARENB;
1150 break;
1151 case BITS_PARITY_MARK:
1152 dev_dbg(dev, "%s - parity = MARK\n", __func__);
1153 cflag |= (PARENB|PARODD|CMSPAR);
1154 break;
1155 case BITS_PARITY_SPACE:
1156 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
1157 cflag &= ~PARODD;
1158 cflag |= (PARENB|CMSPAR);
1159 break;
1160 default:
1161 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
1162 cflag &= ~PARENB;
1163 bits &= ~BITS_PARITY_MASK;
1164 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1165 break;
1166 }
1167
1168 cflag &= ~CSTOPB;
1169 switch (bits & BITS_STOP_MASK) {
1170 case BITS_STOP_1:
1171 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
1172 break;
1173 case BITS_STOP_1_5:
1174 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, 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 case BITS_STOP_2:
1179 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1180 cflag |= CSTOPB;
1181 break;
1182 default:
1183 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
1184 bits &= ~BITS_STOP_MASK;
1185 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1186 break;
1187 }
1188
1189 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1190 sizeof(flow_ctl));
1191 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1192 if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) {
1193 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1194 /*
1195 * When the port is closed, the CP210x hardware disables
1196 * auto-RTS and RTS is deasserted but it leaves auto-CTS when
1197 * in hardware flow control mode. When re-opening the port, if
1198 * auto-CTS is enabled on the cp210x, then auto-RTS must be
1199 * re-enabled in the driver.
1200 */
1201 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1202 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1203 flow_repl |= CP210X_SERIAL_RTS_SHIFT(CP210X_SERIAL_RTS_FLOW_CTL);
1204 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1205 cp210x_write_reg_block(port,
1206 CP210X_SET_FLOW,
1207 &flow_ctl,
1208 sizeof(flow_ctl));
1209
1210 cflag |= CRTSCTS;
1211 } else {
1212 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1213 cflag &= ~CRTSCTS;
1214 }
1215
1216 *cflagp = cflag;
1217 }
1218
1219 struct cp210x_rate {
1220 speed_t rate;
1221 speed_t high;
1222 };
1223
1224 static const struct cp210x_rate cp210x_an205_table1[] = {
1225 { 300, 300 },
1226 { 600, 600 },
1227 { 1200, 1200 },
1228 { 1800, 1800 },
1229 { 2400, 2400 },
1230 { 4000, 4000 },
1231 { 4800, 4803 },
1232 { 7200, 7207 },
1233 { 9600, 9612 },
1234 { 14400, 14428 },
1235 { 16000, 16062 },
1236 { 19200, 19250 },
1237 { 28800, 28912 },
1238 { 38400, 38601 },
1239 { 51200, 51558 },
1240 { 56000, 56280 },
1241 { 57600, 58053 },
1242 { 64000, 64111 },
1243 { 76800, 77608 },
1244 { 115200, 117028 },
1245 { 128000, 129347 },
1246 { 153600, 156868 },
1247 { 230400, 237832 },
1248 { 250000, 254234 },
1249 { 256000, 273066 },
1250 { 460800, 491520 },
1251 { 500000, 567138 },
1252 { 576000, 670254 },
1253 { 921600, UINT_MAX }
1254 };
1255
1256 /*
1257 * Quantises the baud rate as per AN205 Table 1
1258 */
cp210x_get_an205_rate(speed_t baud)1259 static speed_t cp210x_get_an205_rate(speed_t baud)
1260 {
1261 int i;
1262
1263 for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) {
1264 if (baud <= cp210x_an205_table1[i].high)
1265 break;
1266 }
1267
1268 return cp210x_an205_table1[i].rate;
1269 }
1270
cp210x_get_actual_rate(speed_t baud)1271 static speed_t cp210x_get_actual_rate(speed_t baud)
1272 {
1273 unsigned int prescale = 1;
1274 unsigned int div;
1275
1276 if (baud <= 365)
1277 prescale = 4;
1278
1279 div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud);
1280 baud = 48000000 / (2 * prescale * div);
1281
1282 return baud;
1283 }
1284
1285 /*
1286 * CP2101 supports the following baud rates:
1287 *
1288 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
1289 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
1290 *
1291 * CP2102 and CP2103 support the following additional rates:
1292 *
1293 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
1294 * 576000
1295 *
1296 * The device will map a requested rate to a supported one, but the result
1297 * of requests for rates greater than 1053257 is undefined (see AN205).
1298 *
1299 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
1300 * respectively, with an error less than 1%. The actual rates are determined
1301 * by
1302 *
1303 * div = round(freq / (2 x prescale x request))
1304 * actual = freq / (2 x prescale x div)
1305 *
1306 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1307 * or 1 otherwise.
1308 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1309 * otherwise.
1310 */
cp210x_change_speed(struct tty_struct * tty,struct usb_serial_port * port,struct ktermios * old_termios)1311 static void cp210x_change_speed(struct tty_struct *tty,
1312 struct usb_serial_port *port, struct ktermios *old_termios)
1313 {
1314 struct usb_serial *serial = port->serial;
1315 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1316 u32 baud;
1317
1318 /*
1319 * This maps the requested rate to the actual rate, a valid rate on
1320 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed].
1321 *
1322 * NOTE: B0 is not implemented.
1323 */
1324 baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed);
1325
1326 if (priv->use_actual_rate)
1327 baud = cp210x_get_actual_rate(baud);
1328 else if (baud < 1000000)
1329 baud = cp210x_get_an205_rate(baud);
1330
1331 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1332 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1333 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1334 if (old_termios)
1335 baud = old_termios->c_ospeed;
1336 else
1337 baud = 9600;
1338 }
1339
1340 tty_encode_baud_rate(tty, baud, baud);
1341 }
1342
cp210x_enable_event_mode(struct usb_serial_port * port)1343 static void cp210x_enable_event_mode(struct usb_serial_port *port)
1344 {
1345 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1346 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1347 int ret;
1348
1349 if (port_priv->event_mode)
1350 return;
1351
1352 if (priv->no_event_mode)
1353 return;
1354
1355 port_priv->event_state = ES_DATA;
1356 port_priv->event_mode = true;
1357
1358 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR);
1359 if (ret) {
1360 dev_err(&port->dev, "failed to enable events: %d\n", ret);
1361 port_priv->event_mode = false;
1362 }
1363 }
1364
cp210x_disable_event_mode(struct usb_serial_port * port)1365 static void cp210x_disable_event_mode(struct usb_serial_port *port)
1366 {
1367 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1368 int ret;
1369
1370 if (!port_priv->event_mode)
1371 return;
1372
1373 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0);
1374 if (ret) {
1375 dev_err(&port->dev, "failed to disable events: %d\n", ret);
1376 return;
1377 }
1378
1379 port_priv->event_mode = false;
1380 }
1381
cp210x_set_termios(struct tty_struct * tty,struct usb_serial_port * port,struct ktermios * old_termios)1382 static void cp210x_set_termios(struct tty_struct *tty,
1383 struct usb_serial_port *port, struct ktermios *old_termios)
1384 {
1385 struct device *dev = &port->dev;
1386 unsigned int cflag, old_cflag;
1387 u16 bits;
1388
1389 cflag = tty->termios.c_cflag;
1390 old_cflag = old_termios->c_cflag;
1391
1392 if (tty->termios.c_ospeed != old_termios->c_ospeed)
1393 cp210x_change_speed(tty, port, old_termios);
1394
1395 /* If the number of data bits is to be updated */
1396 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
1397 cp210x_get_line_ctl(port, &bits);
1398 bits &= ~BITS_DATA_MASK;
1399 switch (cflag & CSIZE) {
1400 case CS5:
1401 bits |= BITS_DATA_5;
1402 dev_dbg(dev, "%s - data bits = 5\n", __func__);
1403 break;
1404 case CS6:
1405 bits |= BITS_DATA_6;
1406 dev_dbg(dev, "%s - data bits = 6\n", __func__);
1407 break;
1408 case CS7:
1409 bits |= BITS_DATA_7;
1410 dev_dbg(dev, "%s - data bits = 7\n", __func__);
1411 break;
1412 case CS8:
1413 default:
1414 bits |= BITS_DATA_8;
1415 dev_dbg(dev, "%s - data bits = 8\n", __func__);
1416 break;
1417 }
1418 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1419 dev_dbg(dev, "Number of data bits requested not supported by device\n");
1420 }
1421
1422 if ((cflag & (PARENB|PARODD|CMSPAR)) !=
1423 (old_cflag & (PARENB|PARODD|CMSPAR))) {
1424 cp210x_get_line_ctl(port, &bits);
1425 bits &= ~BITS_PARITY_MASK;
1426 if (cflag & PARENB) {
1427 if (cflag & CMSPAR) {
1428 if (cflag & PARODD) {
1429 bits |= BITS_PARITY_MARK;
1430 dev_dbg(dev, "%s - parity = MARK\n", __func__);
1431 } else {
1432 bits |= BITS_PARITY_SPACE;
1433 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
1434 }
1435 } else {
1436 if (cflag & PARODD) {
1437 bits |= BITS_PARITY_ODD;
1438 dev_dbg(dev, "%s - parity = ODD\n", __func__);
1439 } else {
1440 bits |= BITS_PARITY_EVEN;
1441 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
1442 }
1443 }
1444 }
1445 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1446 dev_dbg(dev, "Parity mode not supported by device\n");
1447 }
1448
1449 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
1450 cp210x_get_line_ctl(port, &bits);
1451 bits &= ~BITS_STOP_MASK;
1452 if (cflag & CSTOPB) {
1453 bits |= BITS_STOP_2;
1454 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1455 } else {
1456 bits |= BITS_STOP_1;
1457 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
1458 }
1459 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1460 dev_dbg(dev, "Number of stop bits requested not supported by device\n");
1461 }
1462
1463 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
1464 struct cp210x_flow_ctl flow_ctl;
1465 u32 ctl_hs;
1466 u32 flow_repl;
1467
1468 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1469 sizeof(flow_ctl));
1470 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1471 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1472 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1473 __func__, ctl_hs, flow_repl);
1474
1475 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1476 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1477 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1478 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1479 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE);
1480 if (cflag & CRTSCTS) {
1481 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1482
1483 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1484 flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1485 CP210X_SERIAL_RTS_FLOW_CTL);
1486 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1487 } else {
1488 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1489
1490 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1491 flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1492 CP210X_SERIAL_RTS_ACTIVE);
1493 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1494 }
1495
1496 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1497 __func__, ctl_hs, flow_repl);
1498 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1499 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1500 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1501 sizeof(flow_ctl));
1502 }
1503
1504 /*
1505 * Enable event-insertion mode only if input parity checking is
1506 * enabled for now.
1507 */
1508 if (I_INPCK(tty))
1509 cp210x_enable_event_mode(port);
1510 else
1511 cp210x_disable_event_mode(port);
1512 }
1513
cp210x_tiocmset(struct tty_struct * tty,unsigned int set,unsigned int clear)1514 static int cp210x_tiocmset(struct tty_struct *tty,
1515 unsigned int set, unsigned int clear)
1516 {
1517 struct usb_serial_port *port = tty->driver_data;
1518 return cp210x_tiocmset_port(port, set, clear);
1519 }
1520
cp210x_tiocmset_port(struct usb_serial_port * port,unsigned int set,unsigned int clear)1521 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1522 unsigned int set, unsigned int clear)
1523 {
1524 u16 control = 0;
1525
1526 if (set & TIOCM_RTS) {
1527 control |= CONTROL_RTS;
1528 control |= CONTROL_WRITE_RTS;
1529 }
1530 if (set & TIOCM_DTR) {
1531 control |= CONTROL_DTR;
1532 control |= CONTROL_WRITE_DTR;
1533 }
1534 if (clear & TIOCM_RTS) {
1535 control &= ~CONTROL_RTS;
1536 control |= CONTROL_WRITE_RTS;
1537 }
1538 if (clear & TIOCM_DTR) {
1539 control &= ~CONTROL_DTR;
1540 control |= CONTROL_WRITE_DTR;
1541 }
1542
1543 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
1544
1545 return cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1546 }
1547
cp210x_dtr_rts(struct usb_serial_port * p,int on)1548 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
1549 {
1550 if (on)
1551 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
1552 else
1553 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
1554 }
1555
cp210x_tiocmget(struct tty_struct * tty)1556 static int cp210x_tiocmget(struct tty_struct *tty)
1557 {
1558 struct usb_serial_port *port = tty->driver_data;
1559 u8 control;
1560 int result;
1561
1562 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1563 if (result)
1564 return result;
1565
1566 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1567 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1568 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1569 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1570 |((control & CONTROL_RING)? TIOCM_RI : 0)
1571 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
1572
1573 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
1574
1575 return result;
1576 }
1577
cp210x_break_ctl(struct tty_struct * tty,int break_state)1578 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1579 {
1580 struct usb_serial_port *port = tty->driver_data;
1581 u16 state;
1582
1583 if (break_state == 0)
1584 state = BREAK_OFF;
1585 else
1586 state = BREAK_ON;
1587 dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1588 state == BREAK_OFF ? "off" : "on");
1589 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1590 }
1591
1592 #ifdef CONFIG_GPIOLIB
cp210x_gpio_request(struct gpio_chip * gc,unsigned int offset)1593 static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset)
1594 {
1595 struct usb_serial *serial = gpiochip_get_data(gc);
1596 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1597
1598 if (priv->gpio_altfunc & BIT(offset))
1599 return -ENODEV;
1600
1601 return 0;
1602 }
1603
cp210x_gpio_get(struct gpio_chip * gc,unsigned int gpio)1604 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1605 {
1606 struct usb_serial *serial = gpiochip_get_data(gc);
1607 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1608 u8 req_type = REQTYPE_DEVICE_TO_HOST;
1609 int result;
1610 u8 buf;
1611
1612 if (priv->partnum == CP210X_PARTNUM_CP2105)
1613 req_type = REQTYPE_INTERFACE_TO_HOST;
1614
1615 result = usb_autopm_get_interface(serial->interface);
1616 if (result)
1617 return result;
1618
1619 result = cp210x_read_vendor_block(serial, req_type,
1620 CP210X_READ_LATCH, &buf, sizeof(buf));
1621 usb_autopm_put_interface(serial->interface);
1622 if (result < 0)
1623 return result;
1624
1625 return !!(buf & BIT(gpio));
1626 }
1627
cp210x_gpio_set(struct gpio_chip * gc,unsigned int gpio,int value)1628 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1629 {
1630 struct usb_serial *serial = gpiochip_get_data(gc);
1631 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1632 struct cp210x_gpio_write buf;
1633 int result;
1634
1635 if (value == 1)
1636 buf.state = BIT(gpio);
1637 else
1638 buf.state = 0;
1639
1640 buf.mask = BIT(gpio);
1641
1642 result = usb_autopm_get_interface(serial->interface);
1643 if (result)
1644 goto out;
1645
1646 if (priv->partnum == CP210X_PARTNUM_CP2105) {
1647 result = cp210x_write_vendor_block(serial,
1648 REQTYPE_HOST_TO_INTERFACE,
1649 CP210X_WRITE_LATCH, &buf,
1650 sizeof(buf));
1651 } else {
1652 u16 wIndex = buf.state << 8 | buf.mask;
1653
1654 result = usb_control_msg(serial->dev,
1655 usb_sndctrlpipe(serial->dev, 0),
1656 CP210X_VENDOR_SPECIFIC,
1657 REQTYPE_HOST_TO_DEVICE,
1658 CP210X_WRITE_LATCH,
1659 wIndex,
1660 NULL, 0, USB_CTRL_SET_TIMEOUT);
1661 }
1662
1663 usb_autopm_put_interface(serial->interface);
1664 out:
1665 if (result < 0) {
1666 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n",
1667 result);
1668 }
1669 }
1670
cp210x_gpio_direction_get(struct gpio_chip * gc,unsigned int gpio)1671 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1672 {
1673 struct usb_serial *serial = gpiochip_get_data(gc);
1674 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1675
1676 return priv->gpio_input & BIT(gpio);
1677 }
1678
cp210x_gpio_direction_input(struct gpio_chip * gc,unsigned int gpio)1679 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
1680 {
1681 struct usb_serial *serial = gpiochip_get_data(gc);
1682 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1683
1684 if (priv->partnum == CP210X_PARTNUM_CP2105) {
1685 /* hardware does not support an input mode */
1686 return -ENOTSUPP;
1687 }
1688
1689 /* push-pull pins cannot be changed to be inputs */
1690 if (priv->gpio_pushpull & BIT(gpio))
1691 return -EINVAL;
1692
1693 /* make sure to release pin if it is being driven low */
1694 cp210x_gpio_set(gc, gpio, 1);
1695
1696 priv->gpio_input |= BIT(gpio);
1697
1698 return 0;
1699 }
1700
cp210x_gpio_direction_output(struct gpio_chip * gc,unsigned int gpio,int value)1701 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1702 int value)
1703 {
1704 struct usb_serial *serial = gpiochip_get_data(gc);
1705 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1706
1707 priv->gpio_input &= ~BIT(gpio);
1708 cp210x_gpio_set(gc, gpio, value);
1709
1710 return 0;
1711 }
1712
cp210x_gpio_set_config(struct gpio_chip * gc,unsigned int gpio,unsigned long config)1713 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
1714 unsigned long config)
1715 {
1716 struct usb_serial *serial = gpiochip_get_data(gc);
1717 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1718 enum pin_config_param param = pinconf_to_config_param(config);
1719
1720 /* Succeed only if in correct mode (this can't be set at runtime) */
1721 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) &&
1722 (priv->gpio_pushpull & BIT(gpio)))
1723 return 0;
1724
1725 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) &&
1726 !(priv->gpio_pushpull & BIT(gpio)))
1727 return 0;
1728
1729 return -ENOTSUPP;
1730 }
1731
1732 /*
1733 * This function is for configuring GPIO using shared pins, where other signals
1734 * are made unavailable by configuring the use of GPIO. This is believed to be
1735 * only applicable to the cp2105 at this point, the other devices supported by
1736 * this driver that provide GPIO do so in a way that does not impact other
1737 * signals and are thus expected to have very different initialisation.
1738 */
cp2105_gpioconf_init(struct usb_serial * serial)1739 static int cp2105_gpioconf_init(struct usb_serial *serial)
1740 {
1741 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1742 struct cp210x_pin_mode mode;
1743 struct cp210x_dual_port_config config;
1744 u8 intf_num = cp210x_interface_num(serial);
1745 u8 iface_config;
1746 int result;
1747
1748 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1749 CP210X_GET_DEVICEMODE, &mode,
1750 sizeof(mode));
1751 if (result < 0)
1752 return result;
1753
1754 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1755 CP210X_GET_PORTCONFIG, &config,
1756 sizeof(config));
1757 if (result < 0)
1758 return result;
1759
1760 /* 2 banks of GPIO - One for the pins taken from each serial port */
1761 if (intf_num == 0) {
1762 priv->gc.ngpio = 2;
1763
1764 if (mode.eci == CP210X_PIN_MODE_MODEM) {
1765 /* mark all GPIOs of this interface as reserved */
1766 priv->gpio_altfunc = 0xff;
1767 return 0;
1768 }
1769
1770 iface_config = config.eci_cfg;
1771 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1772 CP210X_ECI_GPIO_MODE_MASK) >>
1773 CP210X_ECI_GPIO_MODE_OFFSET);
1774 } else if (intf_num == 1) {
1775 priv->gc.ngpio = 3;
1776
1777 if (mode.sci == CP210X_PIN_MODE_MODEM) {
1778 /* mark all GPIOs of this interface as reserved */
1779 priv->gpio_altfunc = 0xff;
1780 return 0;
1781 }
1782
1783 iface_config = config.sci_cfg;
1784 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1785 CP210X_SCI_GPIO_MODE_MASK) >>
1786 CP210X_SCI_GPIO_MODE_OFFSET);
1787 } else {
1788 return -ENODEV;
1789 }
1790
1791 /* mark all pins which are not in GPIO mode */
1792 if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */
1793 priv->gpio_altfunc |= BIT(0);
1794 if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */
1795 CP2105_GPIO1_RS485_MODE))
1796 priv->gpio_altfunc |= BIT(1);
1797
1798 /* driver implementation for CP2105 only supports outputs */
1799 priv->gpio_input = 0;
1800
1801 return 0;
1802 }
1803
cp2104_gpioconf_init(struct usb_serial * serial)1804 static int cp2104_gpioconf_init(struct usb_serial *serial)
1805 {
1806 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1807 struct cp210x_single_port_config config;
1808 u8 iface_config;
1809 u8 gpio_latch;
1810 int result;
1811 u8 i;
1812
1813 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1814 CP210X_GET_PORTCONFIG, &config,
1815 sizeof(config));
1816 if (result < 0)
1817 return result;
1818
1819 priv->gc.ngpio = 4;
1820
1821 iface_config = config.device_cfg;
1822 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1823 CP210X_GPIO_MODE_MASK) >>
1824 CP210X_GPIO_MODE_OFFSET);
1825 gpio_latch = (u8)((le16_to_cpu(config.reset_state) &
1826 CP210X_GPIO_MODE_MASK) >>
1827 CP210X_GPIO_MODE_OFFSET);
1828
1829 /* mark all pins which are not in GPIO mode */
1830 if (iface_config & CP2104_GPIO0_TXLED_MODE) /* GPIO 0 */
1831 priv->gpio_altfunc |= BIT(0);
1832 if (iface_config & CP2104_GPIO1_RXLED_MODE) /* GPIO 1 */
1833 priv->gpio_altfunc |= BIT(1);
1834 if (iface_config & CP2104_GPIO2_RS485_MODE) /* GPIO 2 */
1835 priv->gpio_altfunc |= BIT(2);
1836
1837 /*
1838 * Like CP2102N, CP2104 has also no strict input and output pin
1839 * modes.
1840 * Do the same input mode emulation as CP2102N.
1841 */
1842 for (i = 0; i < priv->gc.ngpio; ++i) {
1843 /*
1844 * Set direction to "input" iff pin is open-drain and reset
1845 * value is 1.
1846 */
1847 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1848 priv->gpio_input |= BIT(i);
1849 }
1850
1851 return 0;
1852 }
1853
cp2102n_gpioconf_init(struct usb_serial * serial)1854 static int cp2102n_gpioconf_init(struct usb_serial *serial)
1855 {
1856 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1857 const u16 config_size = 0x02a6;
1858 u8 gpio_rst_latch;
1859 u8 config_version;
1860 u8 gpio_pushpull;
1861 u8 *config_buf;
1862 u8 gpio_latch;
1863 u8 gpio_ctrl;
1864 int result;
1865 u8 i;
1866
1867 /*
1868 * Retrieve device configuration from the device.
1869 * The array received contains all customization settings done at the
1870 * factory/manufacturer. Format of the array is documented at the
1871 * time of writing at:
1872 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa
1873 */
1874 config_buf = kmalloc(config_size, GFP_KERNEL);
1875 if (!config_buf)
1876 return -ENOMEM;
1877
1878 result = cp210x_read_vendor_block(serial,
1879 REQTYPE_DEVICE_TO_HOST,
1880 CP210X_READ_2NCONFIG,
1881 config_buf,
1882 config_size);
1883 if (result < 0) {
1884 kfree(config_buf);
1885 return result;
1886 }
1887
1888 config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX];
1889 gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX];
1890 gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX];
1891 gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX];
1892
1893 kfree(config_buf);
1894
1895 /* Make sure this is a config format we understand. */
1896 if (config_version != 0x01)
1897 return -ENOTSUPP;
1898
1899 priv->gc.ngpio = 4;
1900
1901 /*
1902 * Get default pin states after reset. Needed so we can determine
1903 * the direction of an open-drain pin.
1904 */
1905 gpio_latch = (gpio_rst_latch >> 3) & 0x0f;
1906
1907 /* 0 indicates open-drain mode, 1 is push-pull */
1908 priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f;
1909
1910 /* 0 indicates GPIO mode, 1 is alternate function */
1911 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN20) {
1912 /* QFN20 is special... */
1913 if (gpio_ctrl & CP2102N_QFN20_GPIO0_CLK_MODE) /* GPIO 0 */
1914 priv->gpio_altfunc |= BIT(0);
1915 if (gpio_ctrl & CP2102N_QFN20_GPIO1_RS485_MODE) /* GPIO 1 */
1916 priv->gpio_altfunc |= BIT(1);
1917 if (gpio_ctrl & CP2102N_QFN20_GPIO2_TXLED_MODE) /* GPIO 2 */
1918 priv->gpio_altfunc |= BIT(2);
1919 if (gpio_ctrl & CP2102N_QFN20_GPIO3_RXLED_MODE) /* GPIO 3 */
1920 priv->gpio_altfunc |= BIT(3);
1921 } else {
1922 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f;
1923 }
1924
1925 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) {
1926 /*
1927 * For the QFN28 package, GPIO4-6 are controlled by
1928 * the low three bits of the mode/latch fields.
1929 * Contrary to the document linked above, the bits for
1930 * the SUSPEND pins are elsewhere. No alternate
1931 * function is available for these pins.
1932 */
1933 priv->gc.ngpio = 7;
1934 gpio_latch |= (gpio_rst_latch & 7) << 4;
1935 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4;
1936 }
1937
1938 /*
1939 * The CP2102N does not strictly has input and output pin modes,
1940 * it only knows open-drain and push-pull modes which is set at
1941 * factory. An open-drain pin can function both as an
1942 * input or an output. We emulate input mode for open-drain pins
1943 * by making sure they are not driven low, and we do not allow
1944 * push-pull pins to be set as an input.
1945 */
1946 for (i = 0; i < priv->gc.ngpio; ++i) {
1947 /*
1948 * Set direction to "input" iff pin is open-drain and reset
1949 * value is 1.
1950 */
1951 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1952 priv->gpio_input |= BIT(i);
1953 }
1954
1955 return 0;
1956 }
1957
cp210x_gpio_init(struct usb_serial * serial)1958 static int cp210x_gpio_init(struct usb_serial *serial)
1959 {
1960 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1961 int result;
1962
1963 switch (priv->partnum) {
1964 case CP210X_PARTNUM_CP2104:
1965 result = cp2104_gpioconf_init(serial);
1966 break;
1967 case CP210X_PARTNUM_CP2105:
1968 result = cp2105_gpioconf_init(serial);
1969 break;
1970 case CP210X_PARTNUM_CP2102N_QFN28:
1971 case CP210X_PARTNUM_CP2102N_QFN24:
1972 case CP210X_PARTNUM_CP2102N_QFN20:
1973 result = cp2102n_gpioconf_init(serial);
1974 break;
1975 default:
1976 return 0;
1977 }
1978
1979 if (result < 0)
1980 return result;
1981
1982 priv->gc.label = "cp210x";
1983 priv->gc.request = cp210x_gpio_request;
1984 priv->gc.get_direction = cp210x_gpio_direction_get;
1985 priv->gc.direction_input = cp210x_gpio_direction_input;
1986 priv->gc.direction_output = cp210x_gpio_direction_output;
1987 priv->gc.get = cp210x_gpio_get;
1988 priv->gc.set = cp210x_gpio_set;
1989 priv->gc.set_config = cp210x_gpio_set_config;
1990 priv->gc.owner = THIS_MODULE;
1991 priv->gc.parent = &serial->interface->dev;
1992 priv->gc.base = -1;
1993 priv->gc.can_sleep = true;
1994
1995 result = gpiochip_add_data(&priv->gc, serial);
1996 if (!result)
1997 priv->gpio_registered = true;
1998
1999 return result;
2000 }
2001
cp210x_gpio_remove(struct usb_serial * serial)2002 static void cp210x_gpio_remove(struct usb_serial *serial)
2003 {
2004 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2005
2006 if (priv->gpio_registered) {
2007 gpiochip_remove(&priv->gc);
2008 priv->gpio_registered = false;
2009 }
2010 }
2011
2012 #else
2013
cp210x_gpio_init(struct usb_serial * serial)2014 static int cp210x_gpio_init(struct usb_serial *serial)
2015 {
2016 return 0;
2017 }
2018
cp210x_gpio_remove(struct usb_serial * serial)2019 static void cp210x_gpio_remove(struct usb_serial *serial)
2020 {
2021 /* Nothing to do */
2022 }
2023
2024 #endif
2025
cp210x_port_probe(struct usb_serial_port * port)2026 static int cp210x_port_probe(struct usb_serial_port *port)
2027 {
2028 struct usb_serial *serial = port->serial;
2029 struct cp210x_port_private *port_priv;
2030 int ret;
2031
2032 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
2033 if (!port_priv)
2034 return -ENOMEM;
2035
2036 port_priv->bInterfaceNumber = cp210x_interface_num(serial);
2037
2038 usb_set_serial_port_data(port, port_priv);
2039
2040 ret = cp210x_detect_swapped_line_ctl(port);
2041 if (ret) {
2042 kfree(port_priv);
2043 return ret;
2044 }
2045
2046 return 0;
2047 }
2048
cp210x_port_remove(struct usb_serial_port * port)2049 static int cp210x_port_remove(struct usb_serial_port *port)
2050 {
2051 struct cp210x_port_private *port_priv;
2052
2053 port_priv = usb_get_serial_port_data(port);
2054 kfree(port_priv);
2055
2056 return 0;
2057 }
2058
cp210x_init_max_speed(struct usb_serial * serial)2059 static void cp210x_init_max_speed(struct usb_serial *serial)
2060 {
2061 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2062 bool use_actual_rate = false;
2063 speed_t min = 300;
2064 speed_t max;
2065
2066 switch (priv->partnum) {
2067 case CP210X_PARTNUM_CP2101:
2068 max = 921600;
2069 break;
2070 case CP210X_PARTNUM_CP2102:
2071 case CP210X_PARTNUM_CP2103:
2072 max = 1000000;
2073 break;
2074 case CP210X_PARTNUM_CP2104:
2075 use_actual_rate = true;
2076 max = 2000000;
2077 break;
2078 case CP210X_PARTNUM_CP2108:
2079 max = 2000000;
2080 break;
2081 case CP210X_PARTNUM_CP2105:
2082 if (cp210x_interface_num(serial) == 0) {
2083 use_actual_rate = true;
2084 max = 2000000; /* ECI */
2085 } else {
2086 min = 2400;
2087 max = 921600; /* SCI */
2088 }
2089 break;
2090 case CP210X_PARTNUM_CP2102N_QFN28:
2091 case CP210X_PARTNUM_CP2102N_QFN24:
2092 case CP210X_PARTNUM_CP2102N_QFN20:
2093 use_actual_rate = true;
2094 max = 3000000;
2095 break;
2096 default:
2097 max = 2000000;
2098 break;
2099 }
2100
2101 priv->min_speed = min;
2102 priv->max_speed = max;
2103 priv->use_actual_rate = use_actual_rate;
2104 }
2105
cp2102_determine_quirks(struct usb_serial * serial)2106 static void cp2102_determine_quirks(struct usb_serial *serial)
2107 {
2108 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2109 u8 *buf;
2110 int ret;
2111
2112 buf = kmalloc(2, GFP_KERNEL);
2113 if (!buf)
2114 return;
2115 /*
2116 * Some (possibly counterfeit) CP2102 do not support event-insertion
2117 * mode and respond differently to malformed vendor requests.
2118 * Specifically, they return one instead of two bytes when sent a
2119 * two-byte part-number request.
2120 */
2121 ret = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2122 CP210X_VENDOR_SPECIFIC, REQTYPE_DEVICE_TO_HOST,
2123 CP210X_GET_PARTNUM, 0, buf, 2, USB_CTRL_GET_TIMEOUT);
2124 if (ret == 1) {
2125 dev_dbg(&serial->interface->dev,
2126 "device does not support event-insertion mode\n");
2127 priv->no_event_mode = true;
2128 }
2129
2130 kfree(buf);
2131 }
2132
cp210x_determine_quirks(struct usb_serial * serial)2133 static void cp210x_determine_quirks(struct usb_serial *serial)
2134 {
2135 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2136
2137 switch (priv->partnum) {
2138 case CP210X_PARTNUM_CP2102:
2139 cp2102_determine_quirks(serial);
2140 break;
2141 default:
2142 break;
2143 }
2144 }
2145
cp210x_attach(struct usb_serial * serial)2146 static int cp210x_attach(struct usb_serial *serial)
2147 {
2148 int result;
2149 struct cp210x_serial_private *priv;
2150
2151 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2152 if (!priv)
2153 return -ENOMEM;
2154
2155 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
2156 CP210X_GET_PARTNUM, &priv->partnum,
2157 sizeof(priv->partnum));
2158 if (result < 0) {
2159 dev_warn(&serial->interface->dev,
2160 "querying part number failed\n");
2161 priv->partnum = CP210X_PARTNUM_UNKNOWN;
2162 }
2163
2164 usb_set_serial_data(serial, priv);
2165
2166 cp210x_determine_quirks(serial);
2167 cp210x_init_max_speed(serial);
2168
2169 result = cp210x_gpio_init(serial);
2170 if (result < 0) {
2171 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n",
2172 result);
2173 }
2174
2175 return 0;
2176 }
2177
cp210x_disconnect(struct usb_serial * serial)2178 static void cp210x_disconnect(struct usb_serial *serial)
2179 {
2180 cp210x_gpio_remove(serial);
2181 }
2182
cp210x_release(struct usb_serial * serial)2183 static void cp210x_release(struct usb_serial *serial)
2184 {
2185 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2186
2187 cp210x_gpio_remove(serial);
2188
2189 kfree(priv);
2190 }
2191
2192 module_usb_serial_driver(serial_drivers, id_table);
2193
2194 MODULE_DESCRIPTION(DRIVER_DESC);
2195 MODULE_LICENSE("GPL v2");
2196