1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Silicon Laboratories CP210x USB to RS232 serial adaptor driver
4 *
5 * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
6 * Copyright (C) 2010-2021 Johan Hovold (johan@kernel.org)
7 *
8 * Support to set flow control line levels using TIOCMGET and TIOCMSET
9 * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow
10 * control thanks to Munir Nassar nassarmu@real-time.com
11 *
12 */
13
14 #include <linux/kernel.h>
15 #include <linux/errno.h>
16 #include <linux/slab.h>
17 #include <linux/tty.h>
18 #include <linux/tty_flip.h>
19 #include <linux/module.h>
20 #include <linux/usb.h>
21 #include <linux/usb/serial.h>
22 #include <linux/gpio/driver.h>
23 #include <linux/bitops.h>
24 #include <linux/mutex.h>
25
26 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
27
28 /*
29 * Function Prototypes
30 */
31 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
32 static void cp210x_close(struct usb_serial_port *);
33 static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *,
34 const struct ktermios *);
35 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
36 const struct ktermios *);
37 static bool cp210x_tx_empty(struct usb_serial_port *port);
38 static int cp210x_tiocmget(struct tty_struct *);
39 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
40 static int cp210x_tiocmset_port(struct usb_serial_port *port,
41 unsigned int, unsigned int);
42 static int cp210x_break_ctl(struct tty_struct *, int);
43 static int cp210x_attach(struct usb_serial *);
44 static void cp210x_disconnect(struct usb_serial *);
45 static void cp210x_release(struct usb_serial *);
46 static int cp210x_port_probe(struct usb_serial_port *);
47 static void cp210x_port_remove(struct usb_serial_port *);
48 static void cp210x_dtr_rts(struct usb_serial_port *port, int on);
49 static void cp210x_process_read_urb(struct urb *urb);
50 static void cp210x_enable_event_mode(struct usb_serial_port *port);
51 static void cp210x_disable_event_mode(struct usb_serial_port *port);
52
53 static const struct usb_device_id id_table[] = {
54 { USB_DEVICE(0x0404, 0x034C) }, /* NCR Retail IO Box */
55 { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */
56 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
57 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
58 { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
59 { USB_DEVICE(0x04BF, 0x1301) }, /* TDK Corporation NC0110013M - Network Controller */
60 { USB_DEVICE(0x04BF, 0x1303) }, /* TDK Corporation MM0110113M - i3 Micro Module */
61 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
62 { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */
63 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
64 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
65 { USB_DEVICE(0x0908, 0x0070) }, /* Siemens SCALANCE LPE-9000 USB Serial Console */
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(0x106F, 0x0003) }, /* CPI / Money Controls Bulk Coin Recycler */
76 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
77 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
78 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
79 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
80 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
81 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
82 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
83 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
84 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
85 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
86 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
87 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
88 { USB_DEVICE(0x10C4, 0x8056) }, /* Lorenz Messtechnik devices */
89 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
90 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
91 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
92 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
93 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
94 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
95 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
96 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
97 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
98 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
99 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
100 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
101 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
102 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
103 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
104 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
105 { USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */
106 { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */
107 { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */
108 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
109 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
110 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
111 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
112 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
113 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
114 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
115 { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */
116 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
117 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
118 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
119 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
120 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
121 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
122 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
123 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */
124 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
125 { USB_DEVICE(0x10C4, 0x82AA) }, /* Silicon Labs IFS-USB-DATACABLE used with Quint UPS */
126 { USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */
127 { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */
128 { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */
129 { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */
130 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
131 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
132 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
133 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
134 { USB_DEVICE(0x10C4, 0x83AA) }, /* Mark-10 Digital Force Gauge */
135 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
136 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
137 { USB_DEVICE(0x10C4, 0x8414) }, /* Decagon USB Cable Adapter */
138 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
139 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
140 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */
141 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
142 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
143 { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */
144 { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */
145 { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */
146 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
147 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
148 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
149 { USB_DEVICE(0x10C4, 0x863C) }, /* MGP Instruments PDS100 */
150 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
151 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
152 { USB_DEVICE(0x10C4, 0x87ED) }, /* IMST USB-Stick for Smart Meter */
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(0x11CA, 0x0212) }, /* Verifone USB to Printer (UART, CP2102) */
184 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
185 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
186 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
187 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
188 { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */
189 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
190 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
191 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
192 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
193 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
194 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
195 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
196 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
197 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
198 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
199 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
200 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
201 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
202 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
203 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
204 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
205 { USB_DEVICE(0x17A8, 0x0011) }, /* Kamstrup 444 MHz RF sniffer */
206 { USB_DEVICE(0x17A8, 0x0013) }, /* Kamstrup 870 MHz RF sniffer */
207 { USB_DEVICE(0x17A8, 0x0101) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Int Ant) */
208 { USB_DEVICE(0x17A8, 0x0102) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Ext Ant) */
209 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
210 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
211 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
212 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
213 { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */
214 { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */
215 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
216 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
217 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
218 { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */
219 { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */
220 { USB_DEVICE(0x1901, 0x0197) }, /* GE CS1000 M.2 Key E serial interface */
221 { USB_DEVICE(0x1901, 0x0198) }, /* GE CS1000 Display serial interface */
222 { USB_DEVICE(0x199B, 0xBA30) }, /* LORD WSDA-200-USB */
223 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
224 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
225 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
226 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
227 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
228 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
229 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
230 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
231 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
232 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
233 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
234 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
235 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
236 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
237 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
238 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
239 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
240 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
241 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
242 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
243 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
244 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
245 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
246 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
247 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
248 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
249 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
250 { USB_DEVICE(0x2184, 0x0030) }, /* GW Instek GDM-834x Digital Multimeter */
251 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
252 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
253 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
254 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
255 { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */
256 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
257 { } /* Terminating Entry */
258 };
259
260 MODULE_DEVICE_TABLE(usb, id_table);
261
262 struct cp210x_serial_private {
263 #ifdef CONFIG_GPIOLIB
264 struct gpio_chip gc;
265 bool gpio_registered;
266 u16 gpio_pushpull;
267 u16 gpio_altfunc;
268 u16 gpio_input;
269 #endif
270 u8 partnum;
271 u32 fw_version;
272 speed_t min_speed;
273 speed_t max_speed;
274 bool use_actual_rate;
275 bool no_flow_control;
276 bool no_event_mode;
277 };
278
279 enum cp210x_event_state {
280 ES_DATA,
281 ES_ESCAPE,
282 ES_LSR,
283 ES_LSR_DATA_0,
284 ES_LSR_DATA_1,
285 ES_MSR
286 };
287
288 struct cp210x_port_private {
289 u8 bInterfaceNumber;
290 bool event_mode;
291 enum cp210x_event_state event_state;
292 u8 lsr;
293
294 struct mutex mutex;
295 bool crtscts;
296 bool dtr;
297 bool rts;
298 };
299
300 static struct usb_serial_driver cp210x_device = {
301 .driver = {
302 .owner = THIS_MODULE,
303 .name = "cp210x",
304 },
305 .id_table = id_table,
306 .num_ports = 1,
307 .bulk_in_size = 256,
308 .bulk_out_size = 256,
309 .open = cp210x_open,
310 .close = cp210x_close,
311 .break_ctl = cp210x_break_ctl,
312 .set_termios = cp210x_set_termios,
313 .tx_empty = cp210x_tx_empty,
314 .throttle = usb_serial_generic_throttle,
315 .unthrottle = usb_serial_generic_unthrottle,
316 .tiocmget = cp210x_tiocmget,
317 .tiocmset = cp210x_tiocmset,
318 .get_icount = usb_serial_generic_get_icount,
319 .attach = cp210x_attach,
320 .disconnect = cp210x_disconnect,
321 .release = cp210x_release,
322 .port_probe = cp210x_port_probe,
323 .port_remove = cp210x_port_remove,
324 .dtr_rts = cp210x_dtr_rts,
325 .process_read_urb = cp210x_process_read_urb,
326 };
327
328 static struct usb_serial_driver * const serial_drivers[] = {
329 &cp210x_device, NULL
330 };
331
332 /* Config request types */
333 #define REQTYPE_HOST_TO_INTERFACE 0x41
334 #define REQTYPE_INTERFACE_TO_HOST 0xc1
335 #define REQTYPE_HOST_TO_DEVICE 0x40
336 #define REQTYPE_DEVICE_TO_HOST 0xc0
337
338 /* Config request codes */
339 #define CP210X_IFC_ENABLE 0x00
340 #define CP210X_SET_BAUDDIV 0x01
341 #define CP210X_GET_BAUDDIV 0x02
342 #define CP210X_SET_LINE_CTL 0x03
343 #define CP210X_GET_LINE_CTL 0x04
344 #define CP210X_SET_BREAK 0x05
345 #define CP210X_IMM_CHAR 0x06
346 #define CP210X_SET_MHS 0x07
347 #define CP210X_GET_MDMSTS 0x08
348 #define CP210X_SET_XON 0x09
349 #define CP210X_SET_XOFF 0x0A
350 #define CP210X_SET_EVENTMASK 0x0B
351 #define CP210X_GET_EVENTMASK 0x0C
352 #define CP210X_SET_CHAR 0x0D
353 #define CP210X_GET_CHARS 0x0E
354 #define CP210X_GET_PROPS 0x0F
355 #define CP210X_GET_COMM_STATUS 0x10
356 #define CP210X_RESET 0x11
357 #define CP210X_PURGE 0x12
358 #define CP210X_SET_FLOW 0x13
359 #define CP210X_GET_FLOW 0x14
360 #define CP210X_EMBED_EVENTS 0x15
361 #define CP210X_GET_EVENTSTATE 0x16
362 #define CP210X_SET_CHARS 0x19
363 #define CP210X_GET_BAUDRATE 0x1D
364 #define CP210X_SET_BAUDRATE 0x1E
365 #define CP210X_VENDOR_SPECIFIC 0xFF
366
367 /* CP210X_IFC_ENABLE */
368 #define UART_ENABLE 0x0001
369 #define UART_DISABLE 0x0000
370
371 /* CP210X_(SET|GET)_BAUDDIV */
372 #define BAUD_RATE_GEN_FREQ 0x384000
373
374 /* CP210X_(SET|GET)_LINE_CTL */
375 #define BITS_DATA_MASK 0X0f00
376 #define BITS_DATA_5 0X0500
377 #define BITS_DATA_6 0X0600
378 #define BITS_DATA_7 0X0700
379 #define BITS_DATA_8 0X0800
380 #define BITS_DATA_9 0X0900
381
382 #define BITS_PARITY_MASK 0x00f0
383 #define BITS_PARITY_NONE 0x0000
384 #define BITS_PARITY_ODD 0x0010
385 #define BITS_PARITY_EVEN 0x0020
386 #define BITS_PARITY_MARK 0x0030
387 #define BITS_PARITY_SPACE 0x0040
388
389 #define BITS_STOP_MASK 0x000f
390 #define BITS_STOP_1 0x0000
391 #define BITS_STOP_1_5 0x0001
392 #define BITS_STOP_2 0x0002
393
394 /* CP210X_SET_BREAK */
395 #define BREAK_ON 0x0001
396 #define BREAK_OFF 0x0000
397
398 /* CP210X_(SET_MHS|GET_MDMSTS) */
399 #define CONTROL_DTR 0x0001
400 #define CONTROL_RTS 0x0002
401 #define CONTROL_CTS 0x0010
402 #define CONTROL_DSR 0x0020
403 #define CONTROL_RING 0x0040
404 #define CONTROL_DCD 0x0080
405 #define CONTROL_WRITE_DTR 0x0100
406 #define CONTROL_WRITE_RTS 0x0200
407
408 /* CP210X_(GET|SET)_CHARS */
409 struct cp210x_special_chars {
410 u8 bEofChar;
411 u8 bErrorChar;
412 u8 bBreakChar;
413 u8 bEventChar;
414 u8 bXonChar;
415 u8 bXoffChar;
416 };
417
418 /* CP210X_VENDOR_SPECIFIC values */
419 #define CP210X_GET_FW_VER 0x000E
420 #define CP210X_READ_2NCONFIG 0x000E
421 #define CP210X_GET_FW_VER_2N 0x0010
422 #define CP210X_READ_LATCH 0x00C2
423 #define CP210X_GET_PARTNUM 0x370B
424 #define CP210X_GET_PORTCONFIG 0x370C
425 #define CP210X_GET_DEVICEMODE 0x3711
426 #define CP210X_WRITE_LATCH 0x37E1
427
428 /* Part number definitions */
429 #define CP210X_PARTNUM_CP2101 0x01
430 #define CP210X_PARTNUM_CP2102 0x02
431 #define CP210X_PARTNUM_CP2103 0x03
432 #define CP210X_PARTNUM_CP2104 0x04
433 #define CP210X_PARTNUM_CP2105 0x05
434 #define CP210X_PARTNUM_CP2108 0x08
435 #define CP210X_PARTNUM_CP2102N_QFN28 0x20
436 #define CP210X_PARTNUM_CP2102N_QFN24 0x21
437 #define CP210X_PARTNUM_CP2102N_QFN20 0x22
438 #define CP210X_PARTNUM_UNKNOWN 0xFF
439
440 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
441 struct cp210x_comm_status {
442 __le32 ulErrors;
443 __le32 ulHoldReasons;
444 __le32 ulAmountInInQueue;
445 __le32 ulAmountInOutQueue;
446 u8 bEofReceived;
447 u8 bWaitForImmediate;
448 u8 bReserved;
449 } __packed;
450
451 /*
452 * CP210X_PURGE - 16 bits passed in wValue of USB request.
453 * SiLabs app note AN571 gives a strange description of the 4 bits:
454 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
455 * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
456 */
457 #define PURGE_ALL 0x000f
458
459 /* CP210X_EMBED_EVENTS */
460 #define CP210X_ESCCHAR 0xec
461
462 #define CP210X_LSR_OVERRUN BIT(1)
463 #define CP210X_LSR_PARITY BIT(2)
464 #define CP210X_LSR_FRAME BIT(3)
465 #define CP210X_LSR_BREAK BIT(4)
466
467
468 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
469 struct cp210x_flow_ctl {
470 __le32 ulControlHandshake;
471 __le32 ulFlowReplace;
472 __le32 ulXonLimit;
473 __le32 ulXoffLimit;
474 };
475
476 /* cp210x_flow_ctl::ulControlHandshake */
477 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0)
478 #define CP210X_SERIAL_DTR_INACTIVE (0 << 0)
479 #define CP210X_SERIAL_DTR_ACTIVE (1 << 0)
480 #define CP210X_SERIAL_DTR_FLOW_CTL (2 << 0)
481 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3)
482 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4)
483 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5)
484 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6)
485
486 /* cp210x_flow_ctl::ulFlowReplace */
487 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0)
488 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1)
489 #define CP210X_SERIAL_ERROR_CHAR BIT(2)
490 #define CP210X_SERIAL_NULL_STRIPPING BIT(3)
491 #define CP210X_SERIAL_BREAK_CHAR BIT(4)
492 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6)
493 #define CP210X_SERIAL_RTS_INACTIVE (0 << 6)
494 #define CP210X_SERIAL_RTS_ACTIVE (1 << 6)
495 #define CP210X_SERIAL_RTS_FLOW_CTL (2 << 6)
496 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31)
497
498 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
499 struct cp210x_pin_mode {
500 u8 eci;
501 u8 sci;
502 };
503
504 #define CP210X_PIN_MODE_MODEM 0
505 #define CP210X_PIN_MODE_GPIO BIT(0)
506
507 /*
508 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes
509 * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes.
510 */
511 struct cp210x_dual_port_config {
512 __le16 gpio_mode;
513 u8 __pad0[2];
514 __le16 reset_state;
515 u8 __pad1[4];
516 __le16 suspend_state;
517 u8 sci_cfg;
518 u8 eci_cfg;
519 u8 device_cfg;
520 } __packed;
521
522 /*
523 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes
524 * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes.
525 */
526 struct cp210x_single_port_config {
527 __le16 gpio_mode;
528 u8 __pad0[2];
529 __le16 reset_state;
530 u8 __pad1[4];
531 __le16 suspend_state;
532 u8 device_cfg;
533 } __packed;
534
535 /* GPIO modes */
536 #define CP210X_SCI_GPIO_MODE_OFFSET 9
537 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9)
538
539 #define CP210X_ECI_GPIO_MODE_OFFSET 2
540 #define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2)
541
542 #define CP210X_GPIO_MODE_OFFSET 8
543 #define CP210X_GPIO_MODE_MASK GENMASK(11, 8)
544
545 /* CP2105 port configuration values */
546 #define CP2105_GPIO0_TXLED_MODE BIT(0)
547 #define CP2105_GPIO1_RXLED_MODE BIT(1)
548 #define CP2105_GPIO1_RS485_MODE BIT(2)
549
550 /* CP2104 port configuration values */
551 #define CP2104_GPIO0_TXLED_MODE BIT(0)
552 #define CP2104_GPIO1_RXLED_MODE BIT(1)
553 #define CP2104_GPIO2_RS485_MODE BIT(2)
554
555 struct cp210x_quad_port_state {
556 __le16 gpio_mode_pb0;
557 __le16 gpio_mode_pb1;
558 __le16 gpio_mode_pb2;
559 __le16 gpio_mode_pb3;
560 __le16 gpio_mode_pb4;
561
562 __le16 gpio_lowpower_pb0;
563 __le16 gpio_lowpower_pb1;
564 __le16 gpio_lowpower_pb2;
565 __le16 gpio_lowpower_pb3;
566 __le16 gpio_lowpower_pb4;
567
568 __le16 gpio_latch_pb0;
569 __le16 gpio_latch_pb1;
570 __le16 gpio_latch_pb2;
571 __le16 gpio_latch_pb3;
572 __le16 gpio_latch_pb4;
573 };
574
575 /*
576 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0x49 bytes
577 * on a CP2108 chip.
578 *
579 * See https://www.silabs.com/documents/public/application-notes/an978-cp210x-usb-to-uart-api-specification.pdf
580 */
581 struct cp210x_quad_port_config {
582 struct cp210x_quad_port_state reset_state;
583 struct cp210x_quad_port_state suspend_state;
584 u8 ipdelay_ifc[4];
585 u8 enhancedfxn_ifc[4];
586 u8 enhancedfxn_device;
587 u8 extclkfreq[4];
588 } __packed;
589
590 #define CP2108_EF_IFC_GPIO_TXLED 0x01
591 #define CP2108_EF_IFC_GPIO_RXLED 0x02
592 #define CP2108_EF_IFC_GPIO_RS485 0x04
593 #define CP2108_EF_IFC_GPIO_RS485_LOGIC 0x08
594 #define CP2108_EF_IFC_GPIO_CLOCK 0x10
595 #define CP2108_EF_IFC_DYNAMIC_SUSPEND 0x40
596
597 /* CP2102N configuration array indices */
598 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX 2
599 #define CP210X_2NCONFIG_GPIO_MODE_IDX 581
600 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587
601 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600
602
603 /* CP2102N QFN20 port configuration values */
604 #define CP2102N_QFN20_GPIO2_TXLED_MODE BIT(2)
605 #define CP2102N_QFN20_GPIO3_RXLED_MODE BIT(3)
606 #define CP2102N_QFN20_GPIO1_RS485_MODE BIT(4)
607 #define CP2102N_QFN20_GPIO0_CLK_MODE BIT(6)
608
609 /*
610 * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x02 bytes
611 * for CP2102N, CP2103, CP2104 and CP2105.
612 */
613 struct cp210x_gpio_write {
614 u8 mask;
615 u8 state;
616 };
617
618 /*
619 * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x04 bytes
620 * for CP2108.
621 */
622 struct cp210x_gpio_write16 {
623 __le16 mask;
624 __le16 state;
625 };
626
627 /*
628 * Helper to get interface number when we only have struct usb_serial.
629 */
cp210x_interface_num(struct usb_serial * serial)630 static u8 cp210x_interface_num(struct usb_serial *serial)
631 {
632 struct usb_host_interface *cur_altsetting;
633
634 cur_altsetting = serial->interface->cur_altsetting;
635
636 return cur_altsetting->desc.bInterfaceNumber;
637 }
638
639 /*
640 * Reads a variable-sized block of CP210X_ registers, identified by req.
641 * Returns data into buf in native USB byte order.
642 */
cp210x_read_reg_block(struct usb_serial_port * port,u8 req,void * buf,int bufsize)643 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
644 void *buf, int bufsize)
645 {
646 struct usb_serial *serial = port->serial;
647 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
648 int result;
649
650
651 result = usb_control_msg_recv(serial->dev, 0, req,
652 REQTYPE_INTERFACE_TO_HOST, 0,
653 port_priv->bInterfaceNumber, buf, bufsize,
654 USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
655 if (result) {
656 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
657 req, bufsize, result);
658 return result;
659 }
660
661 return 0;
662 }
663
664 /*
665 * Reads any 8-bit CP210X_ register identified by req.
666 */
cp210x_read_u8_reg(struct usb_serial_port * port,u8 req,u8 * val)667 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
668 {
669 return cp210x_read_reg_block(port, req, val, sizeof(*val));
670 }
671
672 /*
673 * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
674 * Returns data into buf in native USB byte order.
675 */
cp210x_read_vendor_block(struct usb_serial * serial,u8 type,u16 val,void * buf,int bufsize)676 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
677 void *buf, int bufsize)
678 {
679 int result;
680
681 result = usb_control_msg_recv(serial->dev, 0, CP210X_VENDOR_SPECIFIC,
682 type, val, cp210x_interface_num(serial), buf, bufsize,
683 USB_CTRL_GET_TIMEOUT, GFP_KERNEL);
684 if (result) {
685 dev_err(&serial->interface->dev,
686 "failed to get vendor val 0x%04x size %d: %d\n", val,
687 bufsize, result);
688 return result;
689 }
690
691 return 0;
692 }
693
694 /*
695 * Writes any 16-bit CP210X_ register (req) whose value is passed
696 * entirely in the wValue field of the USB request.
697 */
cp210x_write_u16_reg(struct usb_serial_port * port,u8 req,u16 val)698 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
699 {
700 struct usb_serial *serial = port->serial;
701 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
702 int result;
703
704 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
705 req, REQTYPE_HOST_TO_INTERFACE, val,
706 port_priv->bInterfaceNumber, NULL, 0,
707 USB_CTRL_SET_TIMEOUT);
708 if (result < 0) {
709 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
710 req, result);
711 }
712
713 return result;
714 }
715
716 /*
717 * Writes a variable-sized block of CP210X_ registers, identified by req.
718 * Data in buf must be in native USB byte order.
719 */
cp210x_write_reg_block(struct usb_serial_port * port,u8 req,void * buf,int bufsize)720 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
721 void *buf, int bufsize)
722 {
723 struct usb_serial *serial = port->serial;
724 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
725 int result;
726
727 result = usb_control_msg_send(serial->dev, 0, req,
728 REQTYPE_HOST_TO_INTERFACE, 0,
729 port_priv->bInterfaceNumber, buf, bufsize,
730 USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
731 if (result) {
732 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
733 req, bufsize, result);
734 return result;
735 }
736
737 return 0;
738 }
739
740 /*
741 * Writes any 32-bit CP210X_ register identified by req.
742 */
cp210x_write_u32_reg(struct usb_serial_port * port,u8 req,u32 val)743 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
744 {
745 __le32 le32_val;
746
747 le32_val = cpu_to_le32(val);
748
749 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
750 }
751
752 #ifdef CONFIG_GPIOLIB
753 /*
754 * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
755 * Data in buf must be in native USB byte order.
756 */
cp210x_write_vendor_block(struct usb_serial * serial,u8 type,u16 val,void * buf,int bufsize)757 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
758 u16 val, void *buf, int bufsize)
759 {
760 int result;
761
762 result = usb_control_msg_send(serial->dev, 0, CP210X_VENDOR_SPECIFIC,
763 type, val, cp210x_interface_num(serial), buf, bufsize,
764 USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
765 if (result) {
766 dev_err(&serial->interface->dev,
767 "failed to set vendor val 0x%04x size %d: %d\n", val,
768 bufsize, result);
769 return result;
770 }
771
772 return 0;
773 }
774 #endif
775
cp210x_open(struct tty_struct * tty,struct usb_serial_port * port)776 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
777 {
778 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
779 int result;
780
781 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
782 if (result) {
783 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
784 return result;
785 }
786
787 if (tty)
788 cp210x_set_termios(tty, port, NULL);
789
790 result = usb_serial_generic_open(tty, port);
791 if (result)
792 goto err_disable;
793
794 return 0;
795
796 err_disable:
797 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
798 port_priv->event_mode = false;
799
800 return result;
801 }
802
cp210x_close(struct usb_serial_port * port)803 static void cp210x_close(struct usb_serial_port *port)
804 {
805 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
806
807 usb_serial_generic_close(port);
808
809 /* Clear both queues; cp2108 needs this to avoid an occasional hang */
810 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
811
812 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
813
814 /* Disabling the interface disables event-insertion mode. */
815 port_priv->event_mode = false;
816 }
817
cp210x_process_lsr(struct usb_serial_port * port,unsigned char lsr,char * flag)818 static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag)
819 {
820 if (lsr & CP210X_LSR_BREAK) {
821 port->icount.brk++;
822 *flag = TTY_BREAK;
823 } else if (lsr & CP210X_LSR_PARITY) {
824 port->icount.parity++;
825 *flag = TTY_PARITY;
826 } else if (lsr & CP210X_LSR_FRAME) {
827 port->icount.frame++;
828 *flag = TTY_FRAME;
829 }
830
831 if (lsr & CP210X_LSR_OVERRUN) {
832 port->icount.overrun++;
833 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
834 }
835 }
836
cp210x_process_char(struct usb_serial_port * port,unsigned char * ch,char * flag)837 static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag)
838 {
839 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
840
841 switch (port_priv->event_state) {
842 case ES_DATA:
843 if (*ch == CP210X_ESCCHAR) {
844 port_priv->event_state = ES_ESCAPE;
845 break;
846 }
847 return false;
848 case ES_ESCAPE:
849 switch (*ch) {
850 case 0:
851 dev_dbg(&port->dev, "%s - escape char\n", __func__);
852 *ch = CP210X_ESCCHAR;
853 port_priv->event_state = ES_DATA;
854 return false;
855 case 1:
856 port_priv->event_state = ES_LSR_DATA_0;
857 break;
858 case 2:
859 port_priv->event_state = ES_LSR;
860 break;
861 case 3:
862 port_priv->event_state = ES_MSR;
863 break;
864 default:
865 dev_err(&port->dev, "malformed event 0x%02x\n", *ch);
866 port_priv->event_state = ES_DATA;
867 break;
868 }
869 break;
870 case ES_LSR_DATA_0:
871 port_priv->lsr = *ch;
872 port_priv->event_state = ES_LSR_DATA_1;
873 break;
874 case ES_LSR_DATA_1:
875 dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n",
876 __func__, port_priv->lsr, *ch);
877 cp210x_process_lsr(port, port_priv->lsr, flag);
878 port_priv->event_state = ES_DATA;
879 return false;
880 case ES_LSR:
881 dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch);
882 port_priv->lsr = *ch;
883 cp210x_process_lsr(port, port_priv->lsr, flag);
884 port_priv->event_state = ES_DATA;
885 break;
886 case ES_MSR:
887 dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch);
888 /* unimplemented */
889 port_priv->event_state = ES_DATA;
890 break;
891 }
892
893 return true;
894 }
895
cp210x_process_read_urb(struct urb * urb)896 static void cp210x_process_read_urb(struct urb *urb)
897 {
898 struct usb_serial_port *port = urb->context;
899 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
900 unsigned char *ch = urb->transfer_buffer;
901 char flag;
902 int i;
903
904 if (!urb->actual_length)
905 return;
906
907 if (port_priv->event_mode) {
908 for (i = 0; i < urb->actual_length; i++, ch++) {
909 flag = TTY_NORMAL;
910
911 if (cp210x_process_char(port, ch, &flag))
912 continue;
913
914 tty_insert_flip_char(&port->port, *ch, flag);
915 }
916 } else {
917 tty_insert_flip_string(&port->port, ch, urb->actual_length);
918 }
919 tty_flip_buffer_push(&port->port);
920 }
921
922 /*
923 * Read how many bytes are waiting in the TX queue.
924 */
cp210x_get_tx_queue_byte_count(struct usb_serial_port * port,u32 * count)925 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
926 u32 *count)
927 {
928 struct usb_serial *serial = port->serial;
929 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
930 struct cp210x_comm_status sts;
931 int result;
932
933 result = usb_control_msg_recv(serial->dev, 0, CP210X_GET_COMM_STATUS,
934 REQTYPE_INTERFACE_TO_HOST, 0,
935 port_priv->bInterfaceNumber, &sts, sizeof(sts),
936 USB_CTRL_GET_TIMEOUT, GFP_KERNEL);
937 if (result) {
938 dev_err(&port->dev, "failed to get comm status: %d\n", result);
939 return result;
940 }
941
942 *count = le32_to_cpu(sts.ulAmountInOutQueue);
943
944 return 0;
945 }
946
cp210x_tx_empty(struct usb_serial_port * port)947 static bool cp210x_tx_empty(struct usb_serial_port *port)
948 {
949 int err;
950 u32 count;
951
952 err = cp210x_get_tx_queue_byte_count(port, &count);
953 if (err)
954 return true;
955
956 return !count;
957 }
958
959 struct cp210x_rate {
960 speed_t rate;
961 speed_t high;
962 };
963
964 static const struct cp210x_rate cp210x_an205_table1[] = {
965 { 300, 300 },
966 { 600, 600 },
967 { 1200, 1200 },
968 { 1800, 1800 },
969 { 2400, 2400 },
970 { 4000, 4000 },
971 { 4800, 4803 },
972 { 7200, 7207 },
973 { 9600, 9612 },
974 { 14400, 14428 },
975 { 16000, 16062 },
976 { 19200, 19250 },
977 { 28800, 28912 },
978 { 38400, 38601 },
979 { 51200, 51558 },
980 { 56000, 56280 },
981 { 57600, 58053 },
982 { 64000, 64111 },
983 { 76800, 77608 },
984 { 115200, 117028 },
985 { 128000, 129347 },
986 { 153600, 156868 },
987 { 230400, 237832 },
988 { 250000, 254234 },
989 { 256000, 273066 },
990 { 460800, 491520 },
991 { 500000, 567138 },
992 { 576000, 670254 },
993 { 921600, UINT_MAX }
994 };
995
996 /*
997 * Quantises the baud rate as per AN205 Table 1
998 */
cp210x_get_an205_rate(speed_t baud)999 static speed_t cp210x_get_an205_rate(speed_t baud)
1000 {
1001 int i;
1002
1003 for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) {
1004 if (baud <= cp210x_an205_table1[i].high)
1005 break;
1006 }
1007
1008 return cp210x_an205_table1[i].rate;
1009 }
1010
cp210x_get_actual_rate(speed_t baud)1011 static speed_t cp210x_get_actual_rate(speed_t baud)
1012 {
1013 unsigned int prescale = 1;
1014 unsigned int div;
1015
1016 if (baud <= 365)
1017 prescale = 4;
1018
1019 div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud);
1020 baud = 48000000 / (2 * prescale * div);
1021
1022 return baud;
1023 }
1024
1025 /*
1026 * CP2101 supports the following baud rates:
1027 *
1028 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
1029 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
1030 *
1031 * CP2102 and CP2103 support the following additional rates:
1032 *
1033 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
1034 * 576000
1035 *
1036 * The device will map a requested rate to a supported one, but the result
1037 * of requests for rates greater than 1053257 is undefined (see AN205).
1038 *
1039 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
1040 * respectively, with an error less than 1%. The actual rates are determined
1041 * by
1042 *
1043 * div = round(freq / (2 x prescale x request))
1044 * actual = freq / (2 x prescale x div)
1045 *
1046 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1047 * or 1 otherwise.
1048 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1049 * otherwise.
1050 */
cp210x_change_speed(struct tty_struct * tty,struct usb_serial_port * port,const struct ktermios * old_termios)1051 static void cp210x_change_speed(struct tty_struct *tty,
1052 struct usb_serial_port *port,
1053 const struct ktermios *old_termios)
1054 {
1055 struct usb_serial *serial = port->serial;
1056 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1057 u32 baud;
1058
1059 if (tty->termios.c_ospeed == 0)
1060 return;
1061
1062 /*
1063 * This maps the requested rate to the actual rate, a valid rate on
1064 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed].
1065 */
1066 baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed);
1067
1068 if (priv->use_actual_rate)
1069 baud = cp210x_get_actual_rate(baud);
1070 else if (baud < 1000000)
1071 baud = cp210x_get_an205_rate(baud);
1072
1073 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1074 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1075 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1076 if (old_termios)
1077 baud = old_termios->c_ospeed;
1078 else
1079 baud = 9600;
1080 }
1081
1082 tty_encode_baud_rate(tty, baud, baud);
1083 }
1084
cp210x_enable_event_mode(struct usb_serial_port * port)1085 static void cp210x_enable_event_mode(struct usb_serial_port *port)
1086 {
1087 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1088 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1089 int ret;
1090
1091 if (port_priv->event_mode)
1092 return;
1093
1094 if (priv->no_event_mode)
1095 return;
1096
1097 port_priv->event_state = ES_DATA;
1098 port_priv->event_mode = true;
1099
1100 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR);
1101 if (ret) {
1102 dev_err(&port->dev, "failed to enable events: %d\n", ret);
1103 port_priv->event_mode = false;
1104 }
1105 }
1106
cp210x_disable_event_mode(struct usb_serial_port * port)1107 static void cp210x_disable_event_mode(struct usb_serial_port *port)
1108 {
1109 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1110 int ret;
1111
1112 if (!port_priv->event_mode)
1113 return;
1114
1115 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0);
1116 if (ret) {
1117 dev_err(&port->dev, "failed to disable events: %d\n", ret);
1118 return;
1119 }
1120
1121 port_priv->event_mode = false;
1122 }
1123
cp210x_termios_change(const struct ktermios * a,const struct ktermios * b)1124 static bool cp210x_termios_change(const struct ktermios *a, const struct ktermios *b)
1125 {
1126 bool iflag_change, cc_change;
1127
1128 iflag_change = ((a->c_iflag ^ b->c_iflag) & (INPCK | IXON | IXOFF));
1129 cc_change = a->c_cc[VSTART] != b->c_cc[VSTART] ||
1130 a->c_cc[VSTOP] != b->c_cc[VSTOP];
1131
1132 return tty_termios_hw_change(a, b) || iflag_change || cc_change;
1133 }
1134
cp210x_set_flow_control(struct tty_struct * tty,struct usb_serial_port * port,const struct ktermios * old_termios)1135 static void cp210x_set_flow_control(struct tty_struct *tty,
1136 struct usb_serial_port *port,
1137 const struct ktermios *old_termios)
1138 {
1139 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1140 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1141 struct cp210x_special_chars chars;
1142 struct cp210x_flow_ctl flow_ctl;
1143 u32 flow_repl;
1144 u32 ctl_hs;
1145 bool crtscts;
1146 int ret;
1147
1148 /*
1149 * Some CP2102N interpret ulXonLimit as ulFlowReplace (erratum
1150 * CP2102N_E104). Report back that flow control is not supported.
1151 */
1152 if (priv->no_flow_control) {
1153 tty->termios.c_cflag &= ~CRTSCTS;
1154 tty->termios.c_iflag &= ~(IXON | IXOFF);
1155 }
1156
1157 if (tty->termios.c_ospeed != 0 &&
1158 old_termios && old_termios->c_ospeed != 0 &&
1159 C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS) &&
1160 I_IXON(tty) == (old_termios->c_iflag & IXON) &&
1161 I_IXOFF(tty) == (old_termios->c_iflag & IXOFF) &&
1162 START_CHAR(tty) == old_termios->c_cc[VSTART] &&
1163 STOP_CHAR(tty) == old_termios->c_cc[VSTOP]) {
1164 return;
1165 }
1166
1167 if (I_IXON(tty) || I_IXOFF(tty)) {
1168 memset(&chars, 0, sizeof(chars));
1169
1170 chars.bXonChar = START_CHAR(tty);
1171 chars.bXoffChar = STOP_CHAR(tty);
1172
1173 ret = cp210x_write_reg_block(port, CP210X_SET_CHARS, &chars,
1174 sizeof(chars));
1175 if (ret) {
1176 dev_err(&port->dev, "failed to set special chars: %d\n",
1177 ret);
1178 }
1179 }
1180
1181 mutex_lock(&port_priv->mutex);
1182
1183 if (tty->termios.c_ospeed == 0) {
1184 port_priv->dtr = false;
1185 port_priv->rts = false;
1186 } else if (old_termios && old_termios->c_ospeed == 0) {
1187 port_priv->dtr = true;
1188 port_priv->rts = true;
1189 }
1190
1191 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1192 sizeof(flow_ctl));
1193 if (ret)
1194 goto out_unlock;
1195
1196 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1197 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1198
1199 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1200 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1201 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1202 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1203 if (port_priv->dtr)
1204 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE;
1205 else
1206 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE;
1207
1208 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1209 if (C_CRTSCTS(tty)) {
1210 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1211 if (port_priv->rts)
1212 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL;
1213 else
1214 flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1215 crtscts = true;
1216 } else {
1217 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1218 if (port_priv->rts)
1219 flow_repl |= CP210X_SERIAL_RTS_ACTIVE;
1220 else
1221 flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1222 crtscts = false;
1223 }
1224
1225 if (I_IXOFF(tty)) {
1226 flow_repl |= CP210X_SERIAL_AUTO_RECEIVE;
1227
1228 flow_ctl.ulXonLimit = cpu_to_le32(128);
1229 flow_ctl.ulXoffLimit = cpu_to_le32(128);
1230 } else {
1231 flow_repl &= ~CP210X_SERIAL_AUTO_RECEIVE;
1232 }
1233
1234 if (I_IXON(tty))
1235 flow_repl |= CP210X_SERIAL_AUTO_TRANSMIT;
1236 else
1237 flow_repl &= ~CP210X_SERIAL_AUTO_TRANSMIT;
1238
1239 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", __func__,
1240 ctl_hs, flow_repl);
1241
1242 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1243 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1244
1245 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1246 sizeof(flow_ctl));
1247 if (ret)
1248 goto out_unlock;
1249
1250 port_priv->crtscts = crtscts;
1251 out_unlock:
1252 mutex_unlock(&port_priv->mutex);
1253 }
1254
cp210x_set_termios(struct tty_struct * tty,struct usb_serial_port * port,const struct ktermios * old_termios)1255 static void cp210x_set_termios(struct tty_struct *tty,
1256 struct usb_serial_port *port,
1257 const struct ktermios *old_termios)
1258 {
1259 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1260 u16 bits;
1261 int ret;
1262
1263 if (old_termios && !cp210x_termios_change(&tty->termios, old_termios) &&
1264 tty->termios.c_ospeed != 0)
1265 return;
1266
1267 if (!old_termios || tty->termios.c_ospeed != old_termios->c_ospeed)
1268 cp210x_change_speed(tty, port, old_termios);
1269
1270 /* CP2101 only supports CS8, 1 stop bit and non-stick parity. */
1271 if (priv->partnum == CP210X_PARTNUM_CP2101) {
1272 tty->termios.c_cflag &= ~(CSIZE | CSTOPB | CMSPAR);
1273 tty->termios.c_cflag |= CS8;
1274 }
1275
1276 bits = 0;
1277
1278 switch (C_CSIZE(tty)) {
1279 case CS5:
1280 bits |= BITS_DATA_5;
1281 break;
1282 case CS6:
1283 bits |= BITS_DATA_6;
1284 break;
1285 case CS7:
1286 bits |= BITS_DATA_7;
1287 break;
1288 case CS8:
1289 default:
1290 bits |= BITS_DATA_8;
1291 break;
1292 }
1293
1294 if (C_PARENB(tty)) {
1295 if (C_CMSPAR(tty)) {
1296 if (C_PARODD(tty))
1297 bits |= BITS_PARITY_MARK;
1298 else
1299 bits |= BITS_PARITY_SPACE;
1300 } else {
1301 if (C_PARODD(tty))
1302 bits |= BITS_PARITY_ODD;
1303 else
1304 bits |= BITS_PARITY_EVEN;
1305 }
1306 }
1307
1308 if (C_CSTOPB(tty))
1309 bits |= BITS_STOP_2;
1310 else
1311 bits |= BITS_STOP_1;
1312
1313 ret = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1314 if (ret)
1315 dev_err(&port->dev, "failed to set line control: %d\n", ret);
1316
1317 cp210x_set_flow_control(tty, port, old_termios);
1318
1319 /*
1320 * Enable event-insertion mode only if input parity checking is
1321 * enabled for now.
1322 */
1323 if (I_INPCK(tty))
1324 cp210x_enable_event_mode(port);
1325 else
1326 cp210x_disable_event_mode(port);
1327 }
1328
cp210x_tiocmset(struct tty_struct * tty,unsigned int set,unsigned int clear)1329 static int cp210x_tiocmset(struct tty_struct *tty,
1330 unsigned int set, unsigned int clear)
1331 {
1332 struct usb_serial_port *port = tty->driver_data;
1333 return cp210x_tiocmset_port(port, set, clear);
1334 }
1335
cp210x_tiocmset_port(struct usb_serial_port * port,unsigned int set,unsigned int clear)1336 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1337 unsigned int set, unsigned int clear)
1338 {
1339 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1340 struct cp210x_flow_ctl flow_ctl;
1341 u32 ctl_hs, flow_repl;
1342 u16 control = 0;
1343 int ret;
1344
1345 mutex_lock(&port_priv->mutex);
1346
1347 if (set & TIOCM_RTS) {
1348 port_priv->rts = true;
1349 control |= CONTROL_RTS;
1350 control |= CONTROL_WRITE_RTS;
1351 }
1352 if (set & TIOCM_DTR) {
1353 port_priv->dtr = true;
1354 control |= CONTROL_DTR;
1355 control |= CONTROL_WRITE_DTR;
1356 }
1357 if (clear & TIOCM_RTS) {
1358 port_priv->rts = false;
1359 control &= ~CONTROL_RTS;
1360 control |= CONTROL_WRITE_RTS;
1361 }
1362 if (clear & TIOCM_DTR) {
1363 port_priv->dtr = false;
1364 control &= ~CONTROL_DTR;
1365 control |= CONTROL_WRITE_DTR;
1366 }
1367
1368 /*
1369 * Use SET_FLOW to set DTR and enable/disable auto-RTS when hardware
1370 * flow control is enabled.
1371 */
1372 if (port_priv->crtscts && control & CONTROL_WRITE_RTS) {
1373 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1374 sizeof(flow_ctl));
1375 if (ret)
1376 goto out_unlock;
1377
1378 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1379 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1380
1381 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1382 if (port_priv->dtr)
1383 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE;
1384 else
1385 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE;
1386
1387 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1388 if (port_priv->rts)
1389 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL;
1390 else
1391 flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1392
1393 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1394 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1395
1396 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n",
1397 __func__, ctl_hs, flow_repl);
1398
1399 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1400 sizeof(flow_ctl));
1401 } else {
1402 dev_dbg(&port->dev, "%s - control = 0x%04x\n", __func__, control);
1403
1404 ret = cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1405 }
1406 out_unlock:
1407 mutex_unlock(&port_priv->mutex);
1408
1409 return ret;
1410 }
1411
cp210x_dtr_rts(struct usb_serial_port * port,int on)1412 static void cp210x_dtr_rts(struct usb_serial_port *port, int on)
1413 {
1414 if (on)
1415 cp210x_tiocmset_port(port, TIOCM_DTR | TIOCM_RTS, 0);
1416 else
1417 cp210x_tiocmset_port(port, 0, TIOCM_DTR | TIOCM_RTS);
1418 }
1419
cp210x_tiocmget(struct tty_struct * tty)1420 static int cp210x_tiocmget(struct tty_struct *tty)
1421 {
1422 struct usb_serial_port *port = tty->driver_data;
1423 u8 control;
1424 int result;
1425
1426 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1427 if (result)
1428 return result;
1429
1430 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1431 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1432 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1433 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1434 |((control & CONTROL_RING)? TIOCM_RI : 0)
1435 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
1436
1437 dev_dbg(&port->dev, "%s - control = 0x%02x\n", __func__, control);
1438
1439 return result;
1440 }
1441
cp210x_break_ctl(struct tty_struct * tty,int break_state)1442 static int cp210x_break_ctl(struct tty_struct *tty, int break_state)
1443 {
1444 struct usb_serial_port *port = tty->driver_data;
1445 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1446 u16 state;
1447
1448 if (priv->partnum == CP210X_PARTNUM_CP2105) {
1449 if (cp210x_interface_num(port->serial) == 1)
1450 return -ENOTTY;
1451 }
1452
1453 if (break_state == 0)
1454 state = BREAK_OFF;
1455 else
1456 state = BREAK_ON;
1457
1458 dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1459 state == BREAK_OFF ? "off" : "on");
1460
1461 return cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1462 }
1463
1464 #ifdef CONFIG_GPIOLIB
cp210x_gpio_get(struct gpio_chip * gc,unsigned int gpio)1465 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1466 {
1467 struct usb_serial *serial = gpiochip_get_data(gc);
1468 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1469 u8 req_type;
1470 u16 mask;
1471 int result;
1472 int len;
1473
1474 result = usb_autopm_get_interface(serial->interface);
1475 if (result)
1476 return result;
1477
1478 switch (priv->partnum) {
1479 case CP210X_PARTNUM_CP2105:
1480 req_type = REQTYPE_INTERFACE_TO_HOST;
1481 len = 1;
1482 break;
1483 case CP210X_PARTNUM_CP2108:
1484 req_type = REQTYPE_INTERFACE_TO_HOST;
1485 len = 2;
1486 break;
1487 default:
1488 req_type = REQTYPE_DEVICE_TO_HOST;
1489 len = 1;
1490 break;
1491 }
1492
1493 mask = 0;
1494 result = cp210x_read_vendor_block(serial, req_type, CP210X_READ_LATCH,
1495 &mask, len);
1496
1497 usb_autopm_put_interface(serial->interface);
1498
1499 if (result < 0)
1500 return result;
1501
1502 le16_to_cpus(&mask);
1503
1504 return !!(mask & BIT(gpio));
1505 }
1506
cp210x_gpio_set(struct gpio_chip * gc,unsigned int gpio,int value)1507 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1508 {
1509 struct usb_serial *serial = gpiochip_get_data(gc);
1510 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1511 struct cp210x_gpio_write16 buf16;
1512 struct cp210x_gpio_write buf;
1513 u16 mask, state;
1514 u16 wIndex;
1515 int result;
1516
1517 if (value == 1)
1518 state = BIT(gpio);
1519 else
1520 state = 0;
1521
1522 mask = BIT(gpio);
1523
1524 result = usb_autopm_get_interface(serial->interface);
1525 if (result)
1526 goto out;
1527
1528 switch (priv->partnum) {
1529 case CP210X_PARTNUM_CP2105:
1530 buf.mask = (u8)mask;
1531 buf.state = (u8)state;
1532 result = cp210x_write_vendor_block(serial,
1533 REQTYPE_HOST_TO_INTERFACE,
1534 CP210X_WRITE_LATCH, &buf,
1535 sizeof(buf));
1536 break;
1537 case CP210X_PARTNUM_CP2108:
1538 buf16.mask = cpu_to_le16(mask);
1539 buf16.state = cpu_to_le16(state);
1540 result = cp210x_write_vendor_block(serial,
1541 REQTYPE_HOST_TO_INTERFACE,
1542 CP210X_WRITE_LATCH, &buf16,
1543 sizeof(buf16));
1544 break;
1545 default:
1546 wIndex = state << 8 | mask;
1547 result = usb_control_msg(serial->dev,
1548 usb_sndctrlpipe(serial->dev, 0),
1549 CP210X_VENDOR_SPECIFIC,
1550 REQTYPE_HOST_TO_DEVICE,
1551 CP210X_WRITE_LATCH,
1552 wIndex,
1553 NULL, 0, USB_CTRL_SET_TIMEOUT);
1554 break;
1555 }
1556
1557 usb_autopm_put_interface(serial->interface);
1558 out:
1559 if (result < 0) {
1560 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n",
1561 result);
1562 }
1563 }
1564
cp210x_gpio_direction_get(struct gpio_chip * gc,unsigned int gpio)1565 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1566 {
1567 struct usb_serial *serial = gpiochip_get_data(gc);
1568 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1569
1570 return priv->gpio_input & BIT(gpio);
1571 }
1572
cp210x_gpio_direction_input(struct gpio_chip * gc,unsigned int gpio)1573 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
1574 {
1575 struct usb_serial *serial = gpiochip_get_data(gc);
1576 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1577
1578 if (priv->partnum == CP210X_PARTNUM_CP2105) {
1579 /* hardware does not support an input mode */
1580 return -ENOTSUPP;
1581 }
1582
1583 /* push-pull pins cannot be changed to be inputs */
1584 if (priv->gpio_pushpull & BIT(gpio))
1585 return -EINVAL;
1586
1587 /* make sure to release pin if it is being driven low */
1588 cp210x_gpio_set(gc, gpio, 1);
1589
1590 priv->gpio_input |= BIT(gpio);
1591
1592 return 0;
1593 }
1594
cp210x_gpio_direction_output(struct gpio_chip * gc,unsigned int gpio,int value)1595 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1596 int value)
1597 {
1598 struct usb_serial *serial = gpiochip_get_data(gc);
1599 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1600
1601 priv->gpio_input &= ~BIT(gpio);
1602 cp210x_gpio_set(gc, gpio, value);
1603
1604 return 0;
1605 }
1606
cp210x_gpio_set_config(struct gpio_chip * gc,unsigned int gpio,unsigned long config)1607 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
1608 unsigned long config)
1609 {
1610 struct usb_serial *serial = gpiochip_get_data(gc);
1611 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1612 enum pin_config_param param = pinconf_to_config_param(config);
1613
1614 /* Succeed only if in correct mode (this can't be set at runtime) */
1615 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) &&
1616 (priv->gpio_pushpull & BIT(gpio)))
1617 return 0;
1618
1619 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) &&
1620 !(priv->gpio_pushpull & BIT(gpio)))
1621 return 0;
1622
1623 return -ENOTSUPP;
1624 }
1625
cp210x_gpio_init_valid_mask(struct gpio_chip * gc,unsigned long * valid_mask,unsigned int ngpios)1626 static int cp210x_gpio_init_valid_mask(struct gpio_chip *gc,
1627 unsigned long *valid_mask, unsigned int ngpios)
1628 {
1629 struct usb_serial *serial = gpiochip_get_data(gc);
1630 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1631 struct device *dev = &serial->interface->dev;
1632 unsigned long altfunc_mask = priv->gpio_altfunc;
1633
1634 bitmap_complement(valid_mask, &altfunc_mask, ngpios);
1635
1636 if (bitmap_empty(valid_mask, ngpios))
1637 dev_dbg(dev, "no pin configured for GPIO\n");
1638 else
1639 dev_dbg(dev, "GPIO.%*pbl configured for GPIO\n", ngpios,
1640 valid_mask);
1641 return 0;
1642 }
1643
1644 /*
1645 * This function is for configuring GPIO using shared pins, where other signals
1646 * are made unavailable by configuring the use of GPIO. This is believed to be
1647 * only applicable to the cp2105 at this point, the other devices supported by
1648 * this driver that provide GPIO do so in a way that does not impact other
1649 * signals and are thus expected to have very different initialisation.
1650 */
cp2105_gpioconf_init(struct usb_serial * serial)1651 static int cp2105_gpioconf_init(struct usb_serial *serial)
1652 {
1653 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1654 struct cp210x_pin_mode mode;
1655 struct cp210x_dual_port_config config;
1656 u8 intf_num = cp210x_interface_num(serial);
1657 u8 iface_config;
1658 int result;
1659
1660 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1661 CP210X_GET_DEVICEMODE, &mode,
1662 sizeof(mode));
1663 if (result < 0)
1664 return result;
1665
1666 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1667 CP210X_GET_PORTCONFIG, &config,
1668 sizeof(config));
1669 if (result < 0)
1670 return result;
1671
1672 /* 2 banks of GPIO - One for the pins taken from each serial port */
1673 if (intf_num == 0) {
1674 priv->gc.ngpio = 2;
1675
1676 if (mode.eci == CP210X_PIN_MODE_MODEM) {
1677 /* mark all GPIOs of this interface as reserved */
1678 priv->gpio_altfunc = 0xff;
1679 return 0;
1680 }
1681
1682 iface_config = config.eci_cfg;
1683 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1684 CP210X_ECI_GPIO_MODE_MASK) >>
1685 CP210X_ECI_GPIO_MODE_OFFSET);
1686 } else if (intf_num == 1) {
1687 priv->gc.ngpio = 3;
1688
1689 if (mode.sci == CP210X_PIN_MODE_MODEM) {
1690 /* mark all GPIOs of this interface as reserved */
1691 priv->gpio_altfunc = 0xff;
1692 return 0;
1693 }
1694
1695 iface_config = config.sci_cfg;
1696 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1697 CP210X_SCI_GPIO_MODE_MASK) >>
1698 CP210X_SCI_GPIO_MODE_OFFSET);
1699 } else {
1700 return -ENODEV;
1701 }
1702
1703 /* mark all pins which are not in GPIO mode */
1704 if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */
1705 priv->gpio_altfunc |= BIT(0);
1706 if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */
1707 CP2105_GPIO1_RS485_MODE))
1708 priv->gpio_altfunc |= BIT(1);
1709
1710 /* driver implementation for CP2105 only supports outputs */
1711 priv->gpio_input = 0;
1712
1713 return 0;
1714 }
1715
cp2104_gpioconf_init(struct usb_serial * serial)1716 static int cp2104_gpioconf_init(struct usb_serial *serial)
1717 {
1718 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1719 struct cp210x_single_port_config config;
1720 u8 iface_config;
1721 u8 gpio_latch;
1722 int result;
1723 u8 i;
1724
1725 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1726 CP210X_GET_PORTCONFIG, &config,
1727 sizeof(config));
1728 if (result < 0)
1729 return result;
1730
1731 priv->gc.ngpio = 4;
1732
1733 iface_config = config.device_cfg;
1734 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1735 CP210X_GPIO_MODE_MASK) >>
1736 CP210X_GPIO_MODE_OFFSET);
1737 gpio_latch = (u8)((le16_to_cpu(config.reset_state) &
1738 CP210X_GPIO_MODE_MASK) >>
1739 CP210X_GPIO_MODE_OFFSET);
1740
1741 /* mark all pins which are not in GPIO mode */
1742 if (iface_config & CP2104_GPIO0_TXLED_MODE) /* GPIO 0 */
1743 priv->gpio_altfunc |= BIT(0);
1744 if (iface_config & CP2104_GPIO1_RXLED_MODE) /* GPIO 1 */
1745 priv->gpio_altfunc |= BIT(1);
1746 if (iface_config & CP2104_GPIO2_RS485_MODE) /* GPIO 2 */
1747 priv->gpio_altfunc |= BIT(2);
1748
1749 /*
1750 * Like CP2102N, CP2104 has also no strict input and output pin
1751 * modes.
1752 * Do the same input mode emulation as CP2102N.
1753 */
1754 for (i = 0; i < priv->gc.ngpio; ++i) {
1755 /*
1756 * Set direction to "input" iff pin is open-drain and reset
1757 * value is 1.
1758 */
1759 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1760 priv->gpio_input |= BIT(i);
1761 }
1762
1763 return 0;
1764 }
1765
cp2108_gpio_init(struct usb_serial * serial)1766 static int cp2108_gpio_init(struct usb_serial *serial)
1767 {
1768 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1769 struct cp210x_quad_port_config config;
1770 u16 gpio_latch;
1771 int result;
1772 u8 i;
1773
1774 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1775 CP210X_GET_PORTCONFIG, &config,
1776 sizeof(config));
1777 if (result < 0)
1778 return result;
1779
1780 priv->gc.ngpio = 16;
1781 priv->gpio_pushpull = le16_to_cpu(config.reset_state.gpio_mode_pb1);
1782 gpio_latch = le16_to_cpu(config.reset_state.gpio_latch_pb1);
1783
1784 /*
1785 * Mark all pins which are not in GPIO mode.
1786 *
1787 * Refer to table 9.1 "GPIO Mode alternate Functions" in the datasheet:
1788 * https://www.silabs.com/documents/public/data-sheets/cp2108-datasheet.pdf
1789 *
1790 * Alternate functions of GPIO0 to GPIO3 are determine by enhancedfxn_ifc[0]
1791 * and the similarly for the other pins; enhancedfxn_ifc[1]: GPIO4 to GPIO7,
1792 * enhancedfxn_ifc[2]: GPIO8 to GPIO11, enhancedfxn_ifc[3]: GPIO12 to GPIO15.
1793 */
1794 for (i = 0; i < 4; i++) {
1795 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_TXLED)
1796 priv->gpio_altfunc |= BIT(i * 4);
1797 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RXLED)
1798 priv->gpio_altfunc |= BIT((i * 4) + 1);
1799 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RS485)
1800 priv->gpio_altfunc |= BIT((i * 4) + 2);
1801 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_CLOCK)
1802 priv->gpio_altfunc |= BIT((i * 4) + 3);
1803 }
1804
1805 /*
1806 * Like CP2102N, CP2108 has also no strict input and output pin
1807 * modes. Do the same input mode emulation as CP2102N.
1808 */
1809 for (i = 0; i < priv->gc.ngpio; ++i) {
1810 /*
1811 * Set direction to "input" iff pin is open-drain and reset
1812 * value is 1.
1813 */
1814 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1815 priv->gpio_input |= BIT(i);
1816 }
1817
1818 return 0;
1819 }
1820
cp2102n_gpioconf_init(struct usb_serial * serial)1821 static int cp2102n_gpioconf_init(struct usb_serial *serial)
1822 {
1823 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1824 const u16 config_size = 0x02a6;
1825 u8 gpio_rst_latch;
1826 u8 config_version;
1827 u8 gpio_pushpull;
1828 u8 *config_buf;
1829 u8 gpio_latch;
1830 u8 gpio_ctrl;
1831 int result;
1832 u8 i;
1833
1834 /*
1835 * Retrieve device configuration from the device.
1836 * The array received contains all customization settings done at the
1837 * factory/manufacturer. Format of the array is documented at the
1838 * time of writing at:
1839 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa
1840 */
1841 config_buf = kmalloc(config_size, GFP_KERNEL);
1842 if (!config_buf)
1843 return -ENOMEM;
1844
1845 result = cp210x_read_vendor_block(serial,
1846 REQTYPE_DEVICE_TO_HOST,
1847 CP210X_READ_2NCONFIG,
1848 config_buf,
1849 config_size);
1850 if (result < 0) {
1851 kfree(config_buf);
1852 return result;
1853 }
1854
1855 config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX];
1856 gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX];
1857 gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX];
1858 gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX];
1859
1860 kfree(config_buf);
1861
1862 /* Make sure this is a config format we understand. */
1863 if (config_version != 0x01)
1864 return -ENOTSUPP;
1865
1866 priv->gc.ngpio = 4;
1867
1868 /*
1869 * Get default pin states after reset. Needed so we can determine
1870 * the direction of an open-drain pin.
1871 */
1872 gpio_latch = (gpio_rst_latch >> 3) & 0x0f;
1873
1874 /* 0 indicates open-drain mode, 1 is push-pull */
1875 priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f;
1876
1877 /* 0 indicates GPIO mode, 1 is alternate function */
1878 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN20) {
1879 /* QFN20 is special... */
1880 if (gpio_ctrl & CP2102N_QFN20_GPIO0_CLK_MODE) /* GPIO 0 */
1881 priv->gpio_altfunc |= BIT(0);
1882 if (gpio_ctrl & CP2102N_QFN20_GPIO1_RS485_MODE) /* GPIO 1 */
1883 priv->gpio_altfunc |= BIT(1);
1884 if (gpio_ctrl & CP2102N_QFN20_GPIO2_TXLED_MODE) /* GPIO 2 */
1885 priv->gpio_altfunc |= BIT(2);
1886 if (gpio_ctrl & CP2102N_QFN20_GPIO3_RXLED_MODE) /* GPIO 3 */
1887 priv->gpio_altfunc |= BIT(3);
1888 } else {
1889 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f;
1890 }
1891
1892 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) {
1893 /*
1894 * For the QFN28 package, GPIO4-6 are controlled by
1895 * the low three bits of the mode/latch fields.
1896 * Contrary to the document linked above, the bits for
1897 * the SUSPEND pins are elsewhere. No alternate
1898 * function is available for these pins.
1899 */
1900 priv->gc.ngpio = 7;
1901 gpio_latch |= (gpio_rst_latch & 7) << 4;
1902 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4;
1903 }
1904
1905 /*
1906 * The CP2102N does not strictly has input and output pin modes,
1907 * it only knows open-drain and push-pull modes which is set at
1908 * factory. An open-drain pin can function both as an
1909 * input or an output. We emulate input mode for open-drain pins
1910 * by making sure they are not driven low, and we do not allow
1911 * push-pull pins to be set as an input.
1912 */
1913 for (i = 0; i < priv->gc.ngpio; ++i) {
1914 /*
1915 * Set direction to "input" iff pin is open-drain and reset
1916 * value is 1.
1917 */
1918 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1919 priv->gpio_input |= BIT(i);
1920 }
1921
1922 return 0;
1923 }
1924
cp210x_gpio_init(struct usb_serial * serial)1925 static int cp210x_gpio_init(struct usb_serial *serial)
1926 {
1927 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1928 int result;
1929
1930 switch (priv->partnum) {
1931 case CP210X_PARTNUM_CP2104:
1932 result = cp2104_gpioconf_init(serial);
1933 break;
1934 case CP210X_PARTNUM_CP2105:
1935 result = cp2105_gpioconf_init(serial);
1936 break;
1937 case CP210X_PARTNUM_CP2108:
1938 /*
1939 * The GPIOs are not tied to any specific port so only register
1940 * once for interface 0.
1941 */
1942 if (cp210x_interface_num(serial) != 0)
1943 return 0;
1944 result = cp2108_gpio_init(serial);
1945 break;
1946 case CP210X_PARTNUM_CP2102N_QFN28:
1947 case CP210X_PARTNUM_CP2102N_QFN24:
1948 case CP210X_PARTNUM_CP2102N_QFN20:
1949 result = cp2102n_gpioconf_init(serial);
1950 break;
1951 default:
1952 return 0;
1953 }
1954
1955 if (result < 0)
1956 return result;
1957
1958 priv->gc.label = "cp210x";
1959 priv->gc.get_direction = cp210x_gpio_direction_get;
1960 priv->gc.direction_input = cp210x_gpio_direction_input;
1961 priv->gc.direction_output = cp210x_gpio_direction_output;
1962 priv->gc.get = cp210x_gpio_get;
1963 priv->gc.set = cp210x_gpio_set;
1964 priv->gc.set_config = cp210x_gpio_set_config;
1965 priv->gc.init_valid_mask = cp210x_gpio_init_valid_mask;
1966 priv->gc.owner = THIS_MODULE;
1967 priv->gc.parent = &serial->interface->dev;
1968 priv->gc.base = -1;
1969 priv->gc.can_sleep = true;
1970
1971 result = gpiochip_add_data(&priv->gc, serial);
1972 if (!result)
1973 priv->gpio_registered = true;
1974
1975 return result;
1976 }
1977
cp210x_gpio_remove(struct usb_serial * serial)1978 static void cp210x_gpio_remove(struct usb_serial *serial)
1979 {
1980 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1981
1982 if (priv->gpio_registered) {
1983 gpiochip_remove(&priv->gc);
1984 priv->gpio_registered = false;
1985 }
1986 }
1987
1988 #else
1989
cp210x_gpio_init(struct usb_serial * serial)1990 static int cp210x_gpio_init(struct usb_serial *serial)
1991 {
1992 return 0;
1993 }
1994
cp210x_gpio_remove(struct usb_serial * serial)1995 static void cp210x_gpio_remove(struct usb_serial *serial)
1996 {
1997 /* Nothing to do */
1998 }
1999
2000 #endif
2001
cp210x_port_probe(struct usb_serial_port * port)2002 static int cp210x_port_probe(struct usb_serial_port *port)
2003 {
2004 struct usb_serial *serial = port->serial;
2005 struct cp210x_port_private *port_priv;
2006
2007 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
2008 if (!port_priv)
2009 return -ENOMEM;
2010
2011 port_priv->bInterfaceNumber = cp210x_interface_num(serial);
2012 mutex_init(&port_priv->mutex);
2013
2014 usb_set_serial_port_data(port, port_priv);
2015
2016 return 0;
2017 }
2018
cp210x_port_remove(struct usb_serial_port * port)2019 static void cp210x_port_remove(struct usb_serial_port *port)
2020 {
2021 struct cp210x_port_private *port_priv;
2022
2023 port_priv = usb_get_serial_port_data(port);
2024 kfree(port_priv);
2025 }
2026
cp210x_init_max_speed(struct usb_serial * serial)2027 static void cp210x_init_max_speed(struct usb_serial *serial)
2028 {
2029 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2030 bool use_actual_rate = false;
2031 speed_t min = 300;
2032 speed_t max;
2033
2034 switch (priv->partnum) {
2035 case CP210X_PARTNUM_CP2101:
2036 max = 921600;
2037 break;
2038 case CP210X_PARTNUM_CP2102:
2039 case CP210X_PARTNUM_CP2103:
2040 max = 1000000;
2041 break;
2042 case CP210X_PARTNUM_CP2104:
2043 use_actual_rate = true;
2044 max = 2000000;
2045 break;
2046 case CP210X_PARTNUM_CP2108:
2047 max = 2000000;
2048 break;
2049 case CP210X_PARTNUM_CP2105:
2050 if (cp210x_interface_num(serial) == 0) {
2051 use_actual_rate = true;
2052 max = 2000000; /* ECI */
2053 } else {
2054 min = 2400;
2055 max = 921600; /* SCI */
2056 }
2057 break;
2058 case CP210X_PARTNUM_CP2102N_QFN28:
2059 case CP210X_PARTNUM_CP2102N_QFN24:
2060 case CP210X_PARTNUM_CP2102N_QFN20:
2061 use_actual_rate = true;
2062 max = 3000000;
2063 break;
2064 default:
2065 max = 2000000;
2066 break;
2067 }
2068
2069 priv->min_speed = min;
2070 priv->max_speed = max;
2071 priv->use_actual_rate = use_actual_rate;
2072 }
2073
cp2102_determine_quirks(struct usb_serial * serial)2074 static void cp2102_determine_quirks(struct usb_serial *serial)
2075 {
2076 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2077 u8 *buf;
2078 int ret;
2079
2080 buf = kmalloc(2, GFP_KERNEL);
2081 if (!buf)
2082 return;
2083 /*
2084 * Some (possibly counterfeit) CP2102 do not support event-insertion
2085 * mode and respond differently to malformed vendor requests.
2086 * Specifically, they return one instead of two bytes when sent a
2087 * two-byte part-number request.
2088 */
2089 ret = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2090 CP210X_VENDOR_SPECIFIC, REQTYPE_DEVICE_TO_HOST,
2091 CP210X_GET_PARTNUM, 0, buf, 2, USB_CTRL_GET_TIMEOUT);
2092 if (ret == 1) {
2093 dev_dbg(&serial->interface->dev,
2094 "device does not support event-insertion mode\n");
2095 priv->no_event_mode = true;
2096 }
2097
2098 kfree(buf);
2099 }
2100
cp210x_get_fw_version(struct usb_serial * serial,u16 value)2101 static int cp210x_get_fw_version(struct usb_serial *serial, u16 value)
2102 {
2103 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2104 u8 ver[3];
2105 int ret;
2106
2107 ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, value,
2108 ver, sizeof(ver));
2109 if (ret)
2110 return ret;
2111
2112 dev_dbg(&serial->interface->dev, "%s - %d.%d.%d\n", __func__,
2113 ver[0], ver[1], ver[2]);
2114
2115 priv->fw_version = ver[0] << 16 | ver[1] << 8 | ver[2];
2116
2117 return 0;
2118 }
2119
cp210x_determine_type(struct usb_serial * serial)2120 static void cp210x_determine_type(struct usb_serial *serial)
2121 {
2122 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2123 int ret;
2124
2125 ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
2126 CP210X_GET_PARTNUM, &priv->partnum,
2127 sizeof(priv->partnum));
2128 if (ret < 0) {
2129 dev_warn(&serial->interface->dev,
2130 "querying part number failed\n");
2131 priv->partnum = CP210X_PARTNUM_UNKNOWN;
2132 return;
2133 }
2134
2135 dev_dbg(&serial->interface->dev, "partnum = 0x%02x\n", priv->partnum);
2136
2137 switch (priv->partnum) {
2138 case CP210X_PARTNUM_CP2102:
2139 cp2102_determine_quirks(serial);
2140 break;
2141 case CP210X_PARTNUM_CP2105:
2142 case CP210X_PARTNUM_CP2108:
2143 cp210x_get_fw_version(serial, CP210X_GET_FW_VER);
2144 break;
2145 case CP210X_PARTNUM_CP2102N_QFN28:
2146 case CP210X_PARTNUM_CP2102N_QFN24:
2147 case CP210X_PARTNUM_CP2102N_QFN20:
2148 ret = cp210x_get_fw_version(serial, CP210X_GET_FW_VER_2N);
2149 if (ret)
2150 break;
2151 if (priv->fw_version <= 0x10004)
2152 priv->no_flow_control = true;
2153 break;
2154 default:
2155 break;
2156 }
2157 }
2158
cp210x_attach(struct usb_serial * serial)2159 static int cp210x_attach(struct usb_serial *serial)
2160 {
2161 int result;
2162 struct cp210x_serial_private *priv;
2163
2164 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2165 if (!priv)
2166 return -ENOMEM;
2167
2168 usb_set_serial_data(serial, priv);
2169
2170 cp210x_determine_type(serial);
2171 cp210x_init_max_speed(serial);
2172
2173 result = cp210x_gpio_init(serial);
2174 if (result < 0) {
2175 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n",
2176 result);
2177 }
2178
2179 return 0;
2180 }
2181
cp210x_disconnect(struct usb_serial * serial)2182 static void cp210x_disconnect(struct usb_serial *serial)
2183 {
2184 cp210x_gpio_remove(serial);
2185 }
2186
cp210x_release(struct usb_serial * serial)2187 static void cp210x_release(struct usb_serial *serial)
2188 {
2189 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2190
2191 cp210x_gpio_remove(serial);
2192
2193 kfree(priv);
2194 }
2195
2196 module_usb_serial_driver(serial_drivers, id_table);
2197
2198 MODULE_DESCRIPTION(DRIVER_DESC);
2199 MODULE_LICENSE("GPL v2");
2200