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 */
31static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
32static void cp210x_close(struct usb_serial_port *);
33static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *,
34 const struct ktermios *);
35static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
36 const struct ktermios *);
37static bool cp210x_tx_empty(struct usb_serial_port *port);
38static int cp210x_tiocmget(struct tty_struct *);
39static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
40static int cp210x_tiocmset_port(struct usb_serial_port *port,
41 unsigned int, unsigned int);
42static int cp210x_break_ctl(struct tty_struct *, int);
43static int cp210x_attach(struct usb_serial *);
44static void cp210x_disconnect(struct usb_serial *);
45static void cp210x_release(struct usb_serial *);
46static int cp210x_port_probe(struct usb_serial_port *);
47static void cp210x_port_remove(struct usb_serial_port *);
48static void cp210x_dtr_rts(struct usb_serial_port *port, int on);
49static void cp210x_process_read_urb(struct urb *urb);
50static void cp210x_enable_event_mode(struct usb_serial_port *port);
51static void cp210x_disable_event_mode(struct usb_serial_port *port);
52
53static 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(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
60 { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */
61 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
62 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
63 { USB_DEVICE(0x0908, 0x0070) }, /* Siemens SCALANCE LPE-9000 USB Serial Console */
64 { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */
65 { USB_DEVICE(0x0988, 0x0578) }, /* Teraoka AD2000 */
66 { USB_DEVICE(0x0B00, 0x3070) }, /* Ingenico 3070 */
67 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
68 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
69 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
70 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
71 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
72 { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */
73 { USB_DEVICE(0x106F, 0x0003) }, /* CPI / Money Controls Bulk Coin Recycler */
74 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
75 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
76 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
77 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
78 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
79 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
80 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
81 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
82 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
83 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
84 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
85 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
86 { USB_DEVICE(0x10C4, 0x8056) }, /* Lorenz Messtechnik devices */
87 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
88 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
89 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
90 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
91 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
92 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
93 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
94 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
95 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
96 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
97 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
98 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
99 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
100 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
101 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
102 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
103 { USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */
104 { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */
105 { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */
106 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
107 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
108 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
109 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
110 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
111 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
112 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
113 { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */
114 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
115 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
116 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
117 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
118 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
119 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
120 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
121 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */
122 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
123 { USB_DEVICE(0x10C4, 0x82AA) }, /* Silicon Labs IFS-USB-DATACABLE used with Quint UPS */
124 { USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */
125 { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */
126 { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */
127 { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */
128 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
129 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
130 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
131 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
132 { USB_DEVICE(0x10C4, 0x83AA) }, /* Mark-10 Digital Force Gauge */
133 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
134 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
135 { USB_DEVICE(0x10C4, 0x8414) }, /* Decagon USB Cable Adapter */
136 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
137 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
138 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */
139 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
140 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
141 { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */
142 { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */
143 { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */
144 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
145 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
146 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
147 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
148 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
149 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
150 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
151 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
152 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
153 { USB_DEVICE(0x10C4, 0x88D8) }, /* Acuity Brands nLight Air Adapter */
154 { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */
155 { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */
156 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
157 { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */
158 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
159 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
160 { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */
161 { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */
162 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
163 { USB_DEVICE(0x10C4, 0x8A5B) }, /* CEL EM3588 ZigBee USB Stick */
164 { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */
165 { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */
166 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
167 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
168 { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */
169 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
170 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
171 { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */
172 { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */
173 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
174 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
175 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
176 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
177 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
178 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
179 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
180 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
181 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
182 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
183 { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */
184 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
185 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
186 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
187 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
188 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
189 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
190 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
191 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
192 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
193 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
194 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
195 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
196 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
197 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
198 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
199 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
200 { USB_DEVICE(0x17A8, 0x0011) }, /* Kamstrup 444 MHz RF sniffer */
201 { USB_DEVICE(0x17A8, 0x0013) }, /* Kamstrup 870 MHz RF sniffer */
202 { USB_DEVICE(0x17A8, 0x0101) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Int Ant) */
203 { USB_DEVICE(0x17A8, 0x0102) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Ext Ant) */
204 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
205 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
206 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
207 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
208 { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */
209 { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */
210 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
211 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
212 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
213 { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */
214 { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */
215 { USB_DEVICE(0x1901, 0x0197) }, /* GE CS1000 M.2 Key E serial interface */
216 { USB_DEVICE(0x1901, 0x0198) }, /* GE CS1000 Display serial interface */
217 { USB_DEVICE(0x199B, 0xBA30) }, /* LORD WSDA-200-USB */
218 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
219 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
220 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
221 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
222 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
223 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
224 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
225 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
226 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
227 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
228 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
229 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
230 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
231 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
232 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
233 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
234 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
235 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
236 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
237 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
238 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
239 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
240 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
241 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
242 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
243 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
244 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
245 { USB_DEVICE(0x2184, 0x0030) }, /* GW Instek GDM-834x Digital Multimeter */
246 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
247 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
248 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
249 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
250 { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */
251 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
252 { } /* Terminating Entry */
253};
254
255MODULE_DEVICE_TABLE(usb, id_table);
256
257struct cp210x_serial_private {
258#ifdef CONFIG_GPIOLIB
259 struct gpio_chip gc;
260 bool gpio_registered;
261 u16 gpio_pushpull;
262 u16 gpio_altfunc;
263 u16 gpio_input;
264#endif
265 u8 partnum;
266 u32 fw_version;
267 speed_t min_speed;
268 speed_t max_speed;
269 bool use_actual_rate;
270 bool no_flow_control;
271 bool no_event_mode;
272};
273
274enum cp210x_event_state {
275 ES_DATA,
276 ES_ESCAPE,
277 ES_LSR,
278 ES_LSR_DATA_0,
279 ES_LSR_DATA_1,
280 ES_MSR
281};
282
283struct cp210x_port_private {
284 u8 bInterfaceNumber;
285 bool event_mode;
286 enum cp210x_event_state event_state;
287 u8 lsr;
288
289 struct mutex mutex;
290 bool crtscts;
291 bool dtr;
292 bool rts;
293};
294
295static struct usb_serial_driver cp210x_device = {
296 .driver = {
297 .owner = THIS_MODULE,
298 .name = "cp210x",
299 },
300 .id_table = id_table,
301 .num_ports = 1,
302 .bulk_in_size = 256,
303 .bulk_out_size = 256,
304 .open = cp210x_open,
305 .close = cp210x_close,
306 .break_ctl = cp210x_break_ctl,
307 .set_termios = cp210x_set_termios,
308 .tx_empty = cp210x_tx_empty,
309 .throttle = usb_serial_generic_throttle,
310 .unthrottle = usb_serial_generic_unthrottle,
311 .tiocmget = cp210x_tiocmget,
312 .tiocmset = cp210x_tiocmset,
313 .get_icount = usb_serial_generic_get_icount,
314 .attach = cp210x_attach,
315 .disconnect = cp210x_disconnect,
316 .release = cp210x_release,
317 .port_probe = cp210x_port_probe,
318 .port_remove = cp210x_port_remove,
319 .dtr_rts = cp210x_dtr_rts,
320 .process_read_urb = cp210x_process_read_urb,
321};
322
323static struct usb_serial_driver * const serial_drivers[] = {
324 &cp210x_device, NULL
325};
326
327/* Config request types */
328#define REQTYPE_HOST_TO_INTERFACE 0x41
329#define REQTYPE_INTERFACE_TO_HOST 0xc1
330#define REQTYPE_HOST_TO_DEVICE 0x40
331#define REQTYPE_DEVICE_TO_HOST 0xc0
332
333/* Config request codes */
334#define CP210X_IFC_ENABLE 0x00
335#define CP210X_SET_BAUDDIV 0x01
336#define CP210X_GET_BAUDDIV 0x02
337#define CP210X_SET_LINE_CTL 0x03
338#define CP210X_GET_LINE_CTL 0x04
339#define CP210X_SET_BREAK 0x05
340#define CP210X_IMM_CHAR 0x06
341#define CP210X_SET_MHS 0x07
342#define CP210X_GET_MDMSTS 0x08
343#define CP210X_SET_XON 0x09
344#define CP210X_SET_XOFF 0x0A
345#define CP210X_SET_EVENTMASK 0x0B
346#define CP210X_GET_EVENTMASK 0x0C
347#define CP210X_SET_CHAR 0x0D
348#define CP210X_GET_CHARS 0x0E
349#define CP210X_GET_PROPS 0x0F
350#define CP210X_GET_COMM_STATUS 0x10
351#define CP210X_RESET 0x11
352#define CP210X_PURGE 0x12
353#define CP210X_SET_FLOW 0x13
354#define CP210X_GET_FLOW 0x14
355#define CP210X_EMBED_EVENTS 0x15
356#define CP210X_GET_EVENTSTATE 0x16
357#define CP210X_SET_CHARS 0x19
358#define CP210X_GET_BAUDRATE 0x1D
359#define CP210X_SET_BAUDRATE 0x1E
360#define CP210X_VENDOR_SPECIFIC 0xFF
361
362/* CP210X_IFC_ENABLE */
363#define UART_ENABLE 0x0001
364#define UART_DISABLE 0x0000
365
366/* CP210X_(SET|GET)_BAUDDIV */
367#define BAUD_RATE_GEN_FREQ 0x384000
368
369/* CP210X_(SET|GET)_LINE_CTL */
370#define BITS_DATA_MASK 0X0f00
371#define BITS_DATA_5 0X0500
372#define BITS_DATA_6 0X0600
373#define BITS_DATA_7 0X0700
374#define BITS_DATA_8 0X0800
375#define BITS_DATA_9 0X0900
376
377#define BITS_PARITY_MASK 0x00f0
378#define BITS_PARITY_NONE 0x0000
379#define BITS_PARITY_ODD 0x0010
380#define BITS_PARITY_EVEN 0x0020
381#define BITS_PARITY_MARK 0x0030
382#define BITS_PARITY_SPACE 0x0040
383
384#define BITS_STOP_MASK 0x000f
385#define BITS_STOP_1 0x0000
386#define BITS_STOP_1_5 0x0001
387#define BITS_STOP_2 0x0002
388
389/* CP210X_SET_BREAK */
390#define BREAK_ON 0x0001
391#define BREAK_OFF 0x0000
392
393/* CP210X_(SET_MHS|GET_MDMSTS) */
394#define CONTROL_DTR 0x0001
395#define CONTROL_RTS 0x0002
396#define CONTROL_CTS 0x0010
397#define CONTROL_DSR 0x0020
398#define CONTROL_RING 0x0040
399#define CONTROL_DCD 0x0080
400#define CONTROL_WRITE_DTR 0x0100
401#define CONTROL_WRITE_RTS 0x0200
402
403/* CP210X_(GET|SET)_CHARS */
404struct cp210x_special_chars {
405 u8 bEofChar;
406 u8 bErrorChar;
407 u8 bBreakChar;
408 u8 bEventChar;
409 u8 bXonChar;
410 u8 bXoffChar;
411};
412
413/* CP210X_VENDOR_SPECIFIC values */
414#define CP210X_GET_FW_VER 0x000E
415#define CP210X_READ_2NCONFIG 0x000E
416#define CP210X_GET_FW_VER_2N 0x0010
417#define CP210X_READ_LATCH 0x00C2
418#define CP210X_GET_PARTNUM 0x370B
419#define CP210X_GET_PORTCONFIG 0x370C
420#define CP210X_GET_DEVICEMODE 0x3711
421#define CP210X_WRITE_LATCH 0x37E1
422
423/* Part number definitions */
424#define CP210X_PARTNUM_CP2101 0x01
425#define CP210X_PARTNUM_CP2102 0x02
426#define CP210X_PARTNUM_CP2103 0x03
427#define CP210X_PARTNUM_CP2104 0x04
428#define CP210X_PARTNUM_CP2105 0x05
429#define CP210X_PARTNUM_CP2108 0x08
430#define CP210X_PARTNUM_CP2102N_QFN28 0x20
431#define CP210X_PARTNUM_CP2102N_QFN24 0x21
432#define CP210X_PARTNUM_CP2102N_QFN20 0x22
433#define CP210X_PARTNUM_UNKNOWN 0xFF
434
435/* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
436struct cp210x_comm_status {
437 __le32 ulErrors;
438 __le32 ulHoldReasons;
439 __le32 ulAmountInInQueue;
440 __le32 ulAmountInOutQueue;
441 u8 bEofReceived;
442 u8 bWaitForImmediate;
443 u8 bReserved;
444} __packed;
445
446/*
447 * CP210X_PURGE - 16 bits passed in wValue of USB request.
448 * SiLabs app note AN571 gives a strange description of the 4 bits:
449 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
450 * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
451 */
452#define PURGE_ALL 0x000f
453
454/* CP210X_EMBED_EVENTS */
455#define CP210X_ESCCHAR 0xec
456
457#define CP210X_LSR_OVERRUN BIT(1)
458#define CP210X_LSR_PARITY BIT(2)
459#define CP210X_LSR_FRAME BIT(3)
460#define CP210X_LSR_BREAK BIT(4)
461
462
463/* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
464struct cp210x_flow_ctl {
465 __le32 ulControlHandshake;
466 __le32 ulFlowReplace;
467 __le32 ulXonLimit;
468 __le32 ulXoffLimit;
469};
470
471/* cp210x_flow_ctl::ulControlHandshake */
472#define CP210X_SERIAL_DTR_MASK GENMASK(1, 0)
473#define CP210X_SERIAL_DTR_INACTIVE (0 << 0)
474#define CP210X_SERIAL_DTR_ACTIVE (1 << 0)
475#define CP210X_SERIAL_DTR_FLOW_CTL (2 << 0)
476#define CP210X_SERIAL_CTS_HANDSHAKE BIT(3)
477#define CP210X_SERIAL_DSR_HANDSHAKE BIT(4)
478#define CP210X_SERIAL_DCD_HANDSHAKE BIT(5)
479#define CP210X_SERIAL_DSR_SENSITIVITY BIT(6)
480
481/* cp210x_flow_ctl::ulFlowReplace */
482#define CP210X_SERIAL_AUTO_TRANSMIT BIT(0)
483#define CP210X_SERIAL_AUTO_RECEIVE BIT(1)
484#define CP210X_SERIAL_ERROR_CHAR BIT(2)
485#define CP210X_SERIAL_NULL_STRIPPING BIT(3)
486#define CP210X_SERIAL_BREAK_CHAR BIT(4)
487#define CP210X_SERIAL_RTS_MASK GENMASK(7, 6)
488#define CP210X_SERIAL_RTS_INACTIVE (0 << 6)
489#define CP210X_SERIAL_RTS_ACTIVE (1 << 6)
490#define CP210X_SERIAL_RTS_FLOW_CTL (2 << 6)
491#define CP210X_SERIAL_XOFF_CONTINUE BIT(31)
492
493/* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
494struct cp210x_pin_mode {
495 u8 eci;
496 u8 sci;
497};
498
499#define CP210X_PIN_MODE_MODEM 0
500#define CP210X_PIN_MODE_GPIO BIT(0)
501
502/*
503 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes
504 * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes.
505 */
506struct cp210x_dual_port_config {
507 __le16 gpio_mode;
508 u8 __pad0[2];
509 __le16 reset_state;
510 u8 __pad1[4];
511 __le16 suspend_state;
512 u8 sci_cfg;
513 u8 eci_cfg;
514 u8 device_cfg;
515} __packed;
516
517/*
518 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes
519 * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes.
520 */
521struct cp210x_single_port_config {
522 __le16 gpio_mode;
523 u8 __pad0[2];
524 __le16 reset_state;
525 u8 __pad1[4];
526 __le16 suspend_state;
527 u8 device_cfg;
528} __packed;
529
530/* GPIO modes */
531#define CP210X_SCI_GPIO_MODE_OFFSET 9
532#define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9)
533
534#define CP210X_ECI_GPIO_MODE_OFFSET 2
535#define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2)
536
537#define CP210X_GPIO_MODE_OFFSET 8
538#define CP210X_GPIO_MODE_MASK GENMASK(11, 8)
539
540/* CP2105 port configuration values */
541#define CP2105_GPIO0_TXLED_MODE BIT(0)
542#define CP2105_GPIO1_RXLED_MODE BIT(1)
543#define CP2105_GPIO1_RS485_MODE BIT(2)
544
545/* CP2104 port configuration values */
546#define CP2104_GPIO0_TXLED_MODE BIT(0)
547#define CP2104_GPIO1_RXLED_MODE BIT(1)
548#define CP2104_GPIO2_RS485_MODE BIT(2)
549
550struct cp210x_quad_port_state {
551 __le16 gpio_mode_pb0;
552 __le16 gpio_mode_pb1;
553 __le16 gpio_mode_pb2;
554 __le16 gpio_mode_pb3;
555 __le16 gpio_mode_pb4;
556
557 __le16 gpio_lowpower_pb0;
558 __le16 gpio_lowpower_pb1;
559 __le16 gpio_lowpower_pb2;
560 __le16 gpio_lowpower_pb3;
561 __le16 gpio_lowpower_pb4;
562
563 __le16 gpio_latch_pb0;
564 __le16 gpio_latch_pb1;
565 __le16 gpio_latch_pb2;
566 __le16 gpio_latch_pb3;
567 __le16 gpio_latch_pb4;
568};
569
570/*
571 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0x49 bytes
572 * on a CP2108 chip.
573 *
574 * See https://www.silabs.com/documents/public/application-notes/an978-cp210x-usb-to-uart-api-specification.pdf
575 */
576struct cp210x_quad_port_config {
577 struct cp210x_quad_port_state reset_state;
578 struct cp210x_quad_port_state suspend_state;
579 u8 ipdelay_ifc[4];
580 u8 enhancedfxn_ifc[4];
581 u8 enhancedfxn_device;
582 u8 extclkfreq[4];
583} __packed;
584
585#define CP2108_EF_IFC_GPIO_TXLED 0x01
586#define CP2108_EF_IFC_GPIO_RXLED 0x02
587#define CP2108_EF_IFC_GPIO_RS485 0x04
588#define CP2108_EF_IFC_GPIO_RS485_LOGIC 0x08
589#define CP2108_EF_IFC_GPIO_CLOCK 0x10
590#define CP2108_EF_IFC_DYNAMIC_SUSPEND 0x40
591
592/* CP2102N configuration array indices */
593#define CP210X_2NCONFIG_CONFIG_VERSION_IDX 2
594#define CP210X_2NCONFIG_GPIO_MODE_IDX 581
595#define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587
596#define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600
597
598/* CP2102N QFN20 port configuration values */
599#define CP2102N_QFN20_GPIO2_TXLED_MODE BIT(2)
600#define CP2102N_QFN20_GPIO3_RXLED_MODE BIT(3)
601#define CP2102N_QFN20_GPIO1_RS485_MODE BIT(4)
602#define CP2102N_QFN20_GPIO0_CLK_MODE BIT(6)
603
604/*
605 * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x02 bytes
606 * for CP2102N, CP2103, CP2104 and CP2105.
607 */
608struct cp210x_gpio_write {
609 u8 mask;
610 u8 state;
611};
612
613/*
614 * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x04 bytes
615 * for CP2108.
616 */
617struct cp210x_gpio_write16 {
618 __le16 mask;
619 __le16 state;
620};
621
622/*
623 * Helper to get interface number when we only have struct usb_serial.
624 */
625static u8 cp210x_interface_num(struct usb_serial *serial)
626{
627 struct usb_host_interface *cur_altsetting;
628
629 cur_altsetting = serial->interface->cur_altsetting;
630
631 return cur_altsetting->desc.bInterfaceNumber;
632}
633
634/*
635 * Reads a variable-sized block of CP210X_ registers, identified by req.
636 * Returns data into buf in native USB byte order.
637 */
638static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
639 void *buf, int bufsize)
640{
641 struct usb_serial *serial = port->serial;
642 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
643 int result;
644
645
646 result = usb_control_msg_recv(dev: serial->dev, endpoint: 0, request: req,
647 REQTYPE_INTERFACE_TO_HOST, value: 0,
648 index: port_priv->bInterfaceNumber, data: buf, size: bufsize,
649 USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
650 if (result) {
651 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
652 req, bufsize, result);
653 return result;
654 }
655
656 return 0;
657}
658
659/*
660 * Reads any 8-bit CP210X_ register identified by req.
661 */
662static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
663{
664 return cp210x_read_reg_block(port, req, buf: val, bufsize: 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 */
671static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
672 void *buf, int bufsize)
673{
674 int result;
675
676 result = usb_control_msg_recv(dev: serial->dev, endpoint: 0, CP210X_VENDOR_SPECIFIC,
677 requesttype: type, value: val, index: cp210x_interface_num(serial), data: buf, size: bufsize,
678 USB_CTRL_GET_TIMEOUT, GFP_KERNEL);
679 if (result) {
680 dev_err(&serial->interface->dev,
681 "failed to get vendor val 0x%04x size %d: %d\n", val,
682 bufsize, result);
683 return result;
684 }
685
686 return 0;
687}
688
689/*
690 * Writes any 16-bit CP210X_ register (req) whose value is passed
691 * entirely in the wValue field of the USB request.
692 */
693static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
694{
695 struct usb_serial *serial = port->serial;
696 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
697 int result;
698
699 result = usb_control_msg(dev: serial->dev, usb_sndctrlpipe(serial->dev, 0),
700 request: req, REQTYPE_HOST_TO_INTERFACE, value: val,
701 index: port_priv->bInterfaceNumber, NULL, size: 0,
702 USB_CTRL_SET_TIMEOUT);
703 if (result < 0) {
704 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
705 req, result);
706 }
707
708 return result;
709}
710
711/*
712 * Writes a variable-sized block of CP210X_ registers, identified by req.
713 * Data in buf must be in native USB byte order.
714 */
715static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
716 void *buf, int bufsize)
717{
718 struct usb_serial *serial = port->serial;
719 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
720 int result;
721
722 result = usb_control_msg_send(dev: serial->dev, endpoint: 0, request: req,
723 REQTYPE_HOST_TO_INTERFACE, value: 0,
724 index: port_priv->bInterfaceNumber, data: buf, size: bufsize,
725 USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
726 if (result) {
727 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
728 req, bufsize, result);
729 return result;
730 }
731
732 return 0;
733}
734
735/*
736 * Writes any 32-bit CP210X_ register identified by req.
737 */
738static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
739{
740 __le32 le32_val;
741
742 le32_val = cpu_to_le32(val);
743
744 return cp210x_write_reg_block(port, req, buf: &le32_val, bufsize: sizeof(le32_val));
745}
746
747#ifdef CONFIG_GPIOLIB
748/*
749 * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
750 * Data in buf must be in native USB byte order.
751 */
752static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
753 u16 val, void *buf, int bufsize)
754{
755 int result;
756
757 result = usb_control_msg_send(dev: serial->dev, endpoint: 0, CP210X_VENDOR_SPECIFIC,
758 requesttype: type, value: val, index: cp210x_interface_num(serial), data: buf, size: bufsize,
759 USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
760 if (result) {
761 dev_err(&serial->interface->dev,
762 "failed to set vendor val 0x%04x size %d: %d\n", val,
763 bufsize, result);
764 return result;
765 }
766
767 return 0;
768}
769#endif
770
771static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
772{
773 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
774 int result;
775
776 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
777 if (result) {
778 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
779 return result;
780 }
781
782 if (tty)
783 cp210x_set_termios(tty, port, NULL);
784
785 result = usb_serial_generic_open(tty, port);
786 if (result)
787 goto err_disable;
788
789 return 0;
790
791err_disable:
792 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
793 port_priv->event_mode = false;
794
795 return result;
796}
797
798static void cp210x_close(struct usb_serial_port *port)
799{
800 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
801
802 usb_serial_generic_close(port);
803
804 /* Clear both queues; cp2108 needs this to avoid an occasional hang */
805 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
806
807 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
808
809 /* Disabling the interface disables event-insertion mode. */
810 port_priv->event_mode = false;
811}
812
813static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag)
814{
815 if (lsr & CP210X_LSR_BREAK) {
816 port->icount.brk++;
817 *flag = TTY_BREAK;
818 } else if (lsr & CP210X_LSR_PARITY) {
819 port->icount.parity++;
820 *flag = TTY_PARITY;
821 } else if (lsr & CP210X_LSR_FRAME) {
822 port->icount.frame++;
823 *flag = TTY_FRAME;
824 }
825
826 if (lsr & CP210X_LSR_OVERRUN) {
827 port->icount.overrun++;
828 tty_insert_flip_char(port: &port->port, ch: 0, TTY_OVERRUN);
829 }
830}
831
832static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag)
833{
834 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
835
836 switch (port_priv->event_state) {
837 case ES_DATA:
838 if (*ch == CP210X_ESCCHAR) {
839 port_priv->event_state = ES_ESCAPE;
840 break;
841 }
842 return false;
843 case ES_ESCAPE:
844 switch (*ch) {
845 case 0:
846 dev_dbg(&port->dev, "%s - escape char\n", __func__);
847 *ch = CP210X_ESCCHAR;
848 port_priv->event_state = ES_DATA;
849 return false;
850 case 1:
851 port_priv->event_state = ES_LSR_DATA_0;
852 break;
853 case 2:
854 port_priv->event_state = ES_LSR;
855 break;
856 case 3:
857 port_priv->event_state = ES_MSR;
858 break;
859 default:
860 dev_err(&port->dev, "malformed event 0x%02x\n", *ch);
861 port_priv->event_state = ES_DATA;
862 break;
863 }
864 break;
865 case ES_LSR_DATA_0:
866 port_priv->lsr = *ch;
867 port_priv->event_state = ES_LSR_DATA_1;
868 break;
869 case ES_LSR_DATA_1:
870 dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n",
871 __func__, port_priv->lsr, *ch);
872 cp210x_process_lsr(port, lsr: port_priv->lsr, flag);
873 port_priv->event_state = ES_DATA;
874 return false;
875 case ES_LSR:
876 dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch);
877 port_priv->lsr = *ch;
878 cp210x_process_lsr(port, lsr: port_priv->lsr, flag);
879 port_priv->event_state = ES_DATA;
880 break;
881 case ES_MSR:
882 dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch);
883 /* unimplemented */
884 port_priv->event_state = ES_DATA;
885 break;
886 }
887
888 return true;
889}
890
891static void cp210x_process_read_urb(struct urb *urb)
892{
893 struct usb_serial_port *port = urb->context;
894 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
895 unsigned char *ch = urb->transfer_buffer;
896 char flag;
897 int i;
898
899 if (!urb->actual_length)
900 return;
901
902 if (port_priv->event_mode) {
903 for (i = 0; i < urb->actual_length; i++, ch++) {
904 flag = TTY_NORMAL;
905
906 if (cp210x_process_char(port, ch, flag: &flag))
907 continue;
908
909 tty_insert_flip_char(port: &port->port, ch: *ch, flag);
910 }
911 } else {
912 tty_insert_flip_string(port: &port->port, chars: ch, size: urb->actual_length);
913 }
914 tty_flip_buffer_push(port: &port->port);
915}
916
917/*
918 * Read how many bytes are waiting in the TX queue.
919 */
920static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
921 u32 *count)
922{
923 struct usb_serial *serial = port->serial;
924 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
925 struct cp210x_comm_status sts;
926 int result;
927
928 result = usb_control_msg_recv(dev: serial->dev, endpoint: 0, CP210X_GET_COMM_STATUS,
929 REQTYPE_INTERFACE_TO_HOST, value: 0,
930 index: port_priv->bInterfaceNumber, data: &sts, size: sizeof(sts),
931 USB_CTRL_GET_TIMEOUT, GFP_KERNEL);
932 if (result) {
933 dev_err(&port->dev, "failed to get comm status: %d\n", result);
934 return result;
935 }
936
937 *count = le32_to_cpu(sts.ulAmountInOutQueue);
938
939 return 0;
940}
941
942static bool cp210x_tx_empty(struct usb_serial_port *port)
943{
944 int err;
945 u32 count;
946
947 err = cp210x_get_tx_queue_byte_count(port, count: &count);
948 if (err)
949 return true;
950
951 return !count;
952}
953
954struct cp210x_rate {
955 speed_t rate;
956 speed_t high;
957};
958
959static const struct cp210x_rate cp210x_an205_table1[] = {
960 { 300, 300 },
961 { 600, 600 },
962 { 1200, 1200 },
963 { 1800, 1800 },
964 { 2400, 2400 },
965 { 4000, 4000 },
966 { 4800, 4803 },
967 { 7200, 7207 },
968 { 9600, 9612 },
969 { 14400, 14428 },
970 { 16000, 16062 },
971 { 19200, 19250 },
972 { 28800, 28912 },
973 { 38400, 38601 },
974 { 51200, 51558 },
975 { 56000, 56280 },
976 { 57600, 58053 },
977 { 64000, 64111 },
978 { 76800, 77608 },
979 { 115200, 117028 },
980 { 128000, 129347 },
981 { 153600, 156868 },
982 { 230400, 237832 },
983 { 250000, 254234 },
984 { 256000, 273066 },
985 { 460800, 491520 },
986 { 500000, 567138 },
987 { 576000, 670254 },
988 { 921600, UINT_MAX }
989};
990
991/*
992 * Quantises the baud rate as per AN205 Table 1
993 */
994static speed_t cp210x_get_an205_rate(speed_t baud)
995{
996 int i;
997
998 for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) {
999 if (baud <= cp210x_an205_table1[i].high)
1000 break;
1001 }
1002
1003 return cp210x_an205_table1[i].rate;
1004}
1005
1006static speed_t cp210x_get_actual_rate(speed_t baud)
1007{
1008 unsigned int prescale = 1;
1009 unsigned int div;
1010
1011 if (baud <= 365)
1012 prescale = 4;
1013
1014 div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud);
1015 baud = 48000000 / (2 * prescale * div);
1016
1017 return baud;
1018}
1019
1020/*
1021 * CP2101 supports the following baud rates:
1022 *
1023 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
1024 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
1025 *
1026 * CP2102 and CP2103 support the following additional rates:
1027 *
1028 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
1029 * 576000
1030 *
1031 * The device will map a requested rate to a supported one, but the result
1032 * of requests for rates greater than 1053257 is undefined (see AN205).
1033 *
1034 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
1035 * respectively, with an error less than 1%. The actual rates are determined
1036 * by
1037 *
1038 * div = round(freq / (2 x prescale x request))
1039 * actual = freq / (2 x prescale x div)
1040 *
1041 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1042 * or 1 otherwise.
1043 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1044 * otherwise.
1045 */
1046static void cp210x_change_speed(struct tty_struct *tty,
1047 struct usb_serial_port *port,
1048 const struct ktermios *old_termios)
1049{
1050 struct usb_serial *serial = port->serial;
1051 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1052 u32 baud;
1053
1054 if (tty->termios.c_ospeed == 0)
1055 return;
1056
1057 /*
1058 * This maps the requested rate to the actual rate, a valid rate on
1059 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed].
1060 */
1061 baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed);
1062
1063 if (priv->use_actual_rate)
1064 baud = cp210x_get_actual_rate(baud);
1065 else if (baud < 1000000)
1066 baud = cp210x_get_an205_rate(baud);
1067
1068 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1069 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, val: baud)) {
1070 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1071 if (old_termios)
1072 baud = old_termios->c_ospeed;
1073 else
1074 baud = 9600;
1075 }
1076
1077 tty_encode_baud_rate(tty, ibaud: baud, obaud: baud);
1078}
1079
1080static void cp210x_enable_event_mode(struct usb_serial_port *port)
1081{
1082 struct cp210x_serial_private *priv = usb_get_serial_data(serial: port->serial);
1083 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1084 int ret;
1085
1086 if (port_priv->event_mode)
1087 return;
1088
1089 if (priv->no_event_mode)
1090 return;
1091
1092 port_priv->event_state = ES_DATA;
1093 port_priv->event_mode = true;
1094
1095 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR);
1096 if (ret) {
1097 dev_err(&port->dev, "failed to enable events: %d\n", ret);
1098 port_priv->event_mode = false;
1099 }
1100}
1101
1102static void cp210x_disable_event_mode(struct usb_serial_port *port)
1103{
1104 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1105 int ret;
1106
1107 if (!port_priv->event_mode)
1108 return;
1109
1110 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, val: 0);
1111 if (ret) {
1112 dev_err(&port->dev, "failed to disable events: %d\n", ret);
1113 return;
1114 }
1115
1116 port_priv->event_mode = false;
1117}
1118
1119static bool cp210x_termios_change(const struct ktermios *a, const struct ktermios *b)
1120{
1121 bool iflag_change, cc_change;
1122
1123 iflag_change = ((a->c_iflag ^ b->c_iflag) & (INPCK | IXON | IXOFF));
1124 cc_change = a->c_cc[VSTART] != b->c_cc[VSTART] ||
1125 a->c_cc[VSTOP] != b->c_cc[VSTOP];
1126
1127 return tty_termios_hw_change(a, b) || iflag_change || cc_change;
1128}
1129
1130static void cp210x_set_flow_control(struct tty_struct *tty,
1131 struct usb_serial_port *port,
1132 const struct ktermios *old_termios)
1133{
1134 struct cp210x_serial_private *priv = usb_get_serial_data(serial: port->serial);
1135 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1136 struct cp210x_special_chars chars;
1137 struct cp210x_flow_ctl flow_ctl;
1138 u32 flow_repl;
1139 u32 ctl_hs;
1140 bool crtscts;
1141 int ret;
1142
1143 /*
1144 * Some CP2102N interpret ulXonLimit as ulFlowReplace (erratum
1145 * CP2102N_E104). Report back that flow control is not supported.
1146 */
1147 if (priv->no_flow_control) {
1148 tty->termios.c_cflag &= ~CRTSCTS;
1149 tty->termios.c_iflag &= ~(IXON | IXOFF);
1150 }
1151
1152 if (tty->termios.c_ospeed != 0 &&
1153 old_termios && old_termios->c_ospeed != 0 &&
1154 C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS) &&
1155 I_IXON(tty) == (old_termios->c_iflag & IXON) &&
1156 I_IXOFF(tty) == (old_termios->c_iflag & IXOFF) &&
1157 START_CHAR(tty) == old_termios->c_cc[VSTART] &&
1158 STOP_CHAR(tty) == old_termios->c_cc[VSTOP]) {
1159 return;
1160 }
1161
1162 if (I_IXON(tty) || I_IXOFF(tty)) {
1163 memset(&chars, 0, sizeof(chars));
1164
1165 chars.bXonChar = START_CHAR(tty);
1166 chars.bXoffChar = STOP_CHAR(tty);
1167
1168 ret = cp210x_write_reg_block(port, CP210X_SET_CHARS, buf: &chars,
1169 bufsize: sizeof(chars));
1170 if (ret) {
1171 dev_err(&port->dev, "failed to set special chars: %d\n",
1172 ret);
1173 }
1174 }
1175
1176 mutex_lock(&port_priv->mutex);
1177
1178 if (tty->termios.c_ospeed == 0) {
1179 port_priv->dtr = false;
1180 port_priv->rts = false;
1181 } else if (old_termios && old_termios->c_ospeed == 0) {
1182 port_priv->dtr = true;
1183 port_priv->rts = true;
1184 }
1185
1186 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, buf: &flow_ctl,
1187 bufsize: sizeof(flow_ctl));
1188 if (ret)
1189 goto out_unlock;
1190
1191 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1192 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1193
1194 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1195 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1196 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1197 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1198 if (port_priv->dtr)
1199 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE;
1200 else
1201 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE;
1202
1203 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1204 if (C_CRTSCTS(tty)) {
1205 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1206 if (port_priv->rts)
1207 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL;
1208 else
1209 flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1210 crtscts = true;
1211 } else {
1212 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1213 if (port_priv->rts)
1214 flow_repl |= CP210X_SERIAL_RTS_ACTIVE;
1215 else
1216 flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1217 crtscts = false;
1218 }
1219
1220 if (I_IXOFF(tty)) {
1221 flow_repl |= CP210X_SERIAL_AUTO_RECEIVE;
1222
1223 flow_ctl.ulXonLimit = cpu_to_le32(128);
1224 flow_ctl.ulXoffLimit = cpu_to_le32(128);
1225 } else {
1226 flow_repl &= ~CP210X_SERIAL_AUTO_RECEIVE;
1227 }
1228
1229 if (I_IXON(tty))
1230 flow_repl |= CP210X_SERIAL_AUTO_TRANSMIT;
1231 else
1232 flow_repl &= ~CP210X_SERIAL_AUTO_TRANSMIT;
1233
1234 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", __func__,
1235 ctl_hs, flow_repl);
1236
1237 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1238 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1239
1240 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, buf: &flow_ctl,
1241 bufsize: sizeof(flow_ctl));
1242 if (ret)
1243 goto out_unlock;
1244
1245 port_priv->crtscts = crtscts;
1246out_unlock:
1247 mutex_unlock(lock: &port_priv->mutex);
1248}
1249
1250static void cp210x_set_termios(struct tty_struct *tty,
1251 struct usb_serial_port *port,
1252 const struct ktermios *old_termios)
1253{
1254 struct cp210x_serial_private *priv = usb_get_serial_data(serial: port->serial);
1255 u16 bits;
1256 int ret;
1257
1258 if (old_termios && !cp210x_termios_change(a: &tty->termios, b: old_termios) &&
1259 tty->termios.c_ospeed != 0)
1260 return;
1261
1262 if (!old_termios || tty->termios.c_ospeed != old_termios->c_ospeed)
1263 cp210x_change_speed(tty, port, old_termios);
1264
1265 /* CP2101 only supports CS8, 1 stop bit and non-stick parity. */
1266 if (priv->partnum == CP210X_PARTNUM_CP2101) {
1267 tty->termios.c_cflag &= ~(CSIZE | CSTOPB | CMSPAR);
1268 tty->termios.c_cflag |= CS8;
1269 }
1270
1271 bits = 0;
1272
1273 switch (C_CSIZE(tty)) {
1274 case CS5:
1275 bits |= BITS_DATA_5;
1276 break;
1277 case CS6:
1278 bits |= BITS_DATA_6;
1279 break;
1280 case CS7:
1281 bits |= BITS_DATA_7;
1282 break;
1283 case CS8:
1284 default:
1285 bits |= BITS_DATA_8;
1286 break;
1287 }
1288
1289 if (C_PARENB(tty)) {
1290 if (C_CMSPAR(tty)) {
1291 if (C_PARODD(tty))
1292 bits |= BITS_PARITY_MARK;
1293 else
1294 bits |= BITS_PARITY_SPACE;
1295 } else {
1296 if (C_PARODD(tty))
1297 bits |= BITS_PARITY_ODD;
1298 else
1299 bits |= BITS_PARITY_EVEN;
1300 }
1301 }
1302
1303 if (C_CSTOPB(tty))
1304 bits |= BITS_STOP_2;
1305 else
1306 bits |= BITS_STOP_1;
1307
1308 ret = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, val: bits);
1309 if (ret)
1310 dev_err(&port->dev, "failed to set line control: %d\n", ret);
1311
1312 cp210x_set_flow_control(tty, port, old_termios);
1313
1314 /*
1315 * Enable event-insertion mode only if input parity checking is
1316 * enabled for now.
1317 */
1318 if (I_INPCK(tty))
1319 cp210x_enable_event_mode(port);
1320 else
1321 cp210x_disable_event_mode(port);
1322}
1323
1324static int cp210x_tiocmset(struct tty_struct *tty,
1325 unsigned int set, unsigned int clear)
1326{
1327 struct usb_serial_port *port = tty->driver_data;
1328 return cp210x_tiocmset_port(port, set, clear);
1329}
1330
1331static int cp210x_tiocmset_port(struct usb_serial_port *port,
1332 unsigned int set, unsigned int clear)
1333{
1334 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1335 struct cp210x_flow_ctl flow_ctl;
1336 u32 ctl_hs, flow_repl;
1337 u16 control = 0;
1338 int ret;
1339
1340 mutex_lock(&port_priv->mutex);
1341
1342 if (set & TIOCM_RTS) {
1343 port_priv->rts = true;
1344 control |= CONTROL_RTS;
1345 control |= CONTROL_WRITE_RTS;
1346 }
1347 if (set & TIOCM_DTR) {
1348 port_priv->dtr = true;
1349 control |= CONTROL_DTR;
1350 control |= CONTROL_WRITE_DTR;
1351 }
1352 if (clear & TIOCM_RTS) {
1353 port_priv->rts = false;
1354 control &= ~CONTROL_RTS;
1355 control |= CONTROL_WRITE_RTS;
1356 }
1357 if (clear & TIOCM_DTR) {
1358 port_priv->dtr = false;
1359 control &= ~CONTROL_DTR;
1360 control |= CONTROL_WRITE_DTR;
1361 }
1362
1363 /*
1364 * Use SET_FLOW to set DTR and enable/disable auto-RTS when hardware
1365 * flow control is enabled.
1366 */
1367 if (port_priv->crtscts && control & CONTROL_WRITE_RTS) {
1368 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, buf: &flow_ctl,
1369 bufsize: sizeof(flow_ctl));
1370 if (ret)
1371 goto out_unlock;
1372
1373 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1374 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1375
1376 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1377 if (port_priv->dtr)
1378 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE;
1379 else
1380 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE;
1381
1382 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1383 if (port_priv->rts)
1384 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL;
1385 else
1386 flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1387
1388 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1389 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1390
1391 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n",
1392 __func__, ctl_hs, flow_repl);
1393
1394 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, buf: &flow_ctl,
1395 bufsize: sizeof(flow_ctl));
1396 } else {
1397 dev_dbg(&port->dev, "%s - control = 0x%04x\n", __func__, control);
1398
1399 ret = cp210x_write_u16_reg(port, CP210X_SET_MHS, val: control);
1400 }
1401out_unlock:
1402 mutex_unlock(lock: &port_priv->mutex);
1403
1404 return ret;
1405}
1406
1407static void cp210x_dtr_rts(struct usb_serial_port *port, int on)
1408{
1409 if (on)
1410 cp210x_tiocmset_port(port, TIOCM_DTR | TIOCM_RTS, clear: 0);
1411 else
1412 cp210x_tiocmset_port(port, set: 0, TIOCM_DTR | TIOCM_RTS);
1413}
1414
1415static int cp210x_tiocmget(struct tty_struct *tty)
1416{
1417 struct usb_serial_port *port = tty->driver_data;
1418 u8 control;
1419 int result;
1420
1421 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, val: &control);
1422 if (result)
1423 return result;
1424
1425 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1426 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1427 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1428 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1429 |((control & CONTROL_RING)? TIOCM_RI : 0)
1430 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
1431
1432 dev_dbg(&port->dev, "%s - control = 0x%02x\n", __func__, control);
1433
1434 return result;
1435}
1436
1437static int cp210x_break_ctl(struct tty_struct *tty, int break_state)
1438{
1439 struct usb_serial_port *port = tty->driver_data;
1440 struct cp210x_serial_private *priv = usb_get_serial_data(serial: port->serial);
1441 u16 state;
1442
1443 if (priv->partnum == CP210X_PARTNUM_CP2105) {
1444 if (cp210x_interface_num(serial: port->serial) == 1)
1445 return -ENOTTY;
1446 }
1447
1448 if (break_state == 0)
1449 state = BREAK_OFF;
1450 else
1451 state = BREAK_ON;
1452
1453 dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1454 state == BREAK_OFF ? "off" : "on");
1455
1456 return cp210x_write_u16_reg(port, CP210X_SET_BREAK, val: state);
1457}
1458
1459#ifdef CONFIG_GPIOLIB
1460static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1461{
1462 struct usb_serial *serial = gpiochip_get_data(gc);
1463 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1464 u8 req_type;
1465 u16 mask;
1466 int result;
1467 int len;
1468
1469 result = usb_autopm_get_interface(intf: serial->interface);
1470 if (result)
1471 return result;
1472
1473 switch (priv->partnum) {
1474 case CP210X_PARTNUM_CP2105:
1475 req_type = REQTYPE_INTERFACE_TO_HOST;
1476 len = 1;
1477 break;
1478 case CP210X_PARTNUM_CP2108:
1479 req_type = REQTYPE_INTERFACE_TO_HOST;
1480 len = 2;
1481 break;
1482 default:
1483 req_type = REQTYPE_DEVICE_TO_HOST;
1484 len = 1;
1485 break;
1486 }
1487
1488 mask = 0;
1489 result = cp210x_read_vendor_block(serial, type: req_type, CP210X_READ_LATCH,
1490 buf: &mask, bufsize: len);
1491
1492 usb_autopm_put_interface(intf: serial->interface);
1493
1494 if (result < 0)
1495 return result;
1496
1497 le16_to_cpus(&mask);
1498
1499 return !!(mask & BIT(gpio));
1500}
1501
1502static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1503{
1504 struct usb_serial *serial = gpiochip_get_data(gc);
1505 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1506 struct cp210x_gpio_write16 buf16;
1507 struct cp210x_gpio_write buf;
1508 u16 mask, state;
1509 u16 wIndex;
1510 int result;
1511
1512 if (value == 1)
1513 state = BIT(gpio);
1514 else
1515 state = 0;
1516
1517 mask = BIT(gpio);
1518
1519 result = usb_autopm_get_interface(intf: serial->interface);
1520 if (result)
1521 goto out;
1522
1523 switch (priv->partnum) {
1524 case CP210X_PARTNUM_CP2105:
1525 buf.mask = (u8)mask;
1526 buf.state = (u8)state;
1527 result = cp210x_write_vendor_block(serial,
1528 REQTYPE_HOST_TO_INTERFACE,
1529 CP210X_WRITE_LATCH, buf: &buf,
1530 bufsize: sizeof(buf));
1531 break;
1532 case CP210X_PARTNUM_CP2108:
1533 buf16.mask = cpu_to_le16(mask);
1534 buf16.state = cpu_to_le16(state);
1535 result = cp210x_write_vendor_block(serial,
1536 REQTYPE_HOST_TO_INTERFACE,
1537 CP210X_WRITE_LATCH, buf: &buf16,
1538 bufsize: sizeof(buf16));
1539 break;
1540 default:
1541 wIndex = state << 8 | mask;
1542 result = usb_control_msg(dev: serial->dev,
1543 usb_sndctrlpipe(serial->dev, 0),
1544 CP210X_VENDOR_SPECIFIC,
1545 REQTYPE_HOST_TO_DEVICE,
1546 CP210X_WRITE_LATCH,
1547 index: wIndex,
1548 NULL, size: 0, USB_CTRL_SET_TIMEOUT);
1549 break;
1550 }
1551
1552 usb_autopm_put_interface(intf: serial->interface);
1553out:
1554 if (result < 0) {
1555 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n",
1556 result);
1557 }
1558}
1559
1560static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1561{
1562 struct usb_serial *serial = gpiochip_get_data(gc);
1563 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1564
1565 return priv->gpio_input & BIT(gpio);
1566}
1567
1568static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
1569{
1570 struct usb_serial *serial = gpiochip_get_data(gc);
1571 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1572
1573 if (priv->partnum == CP210X_PARTNUM_CP2105) {
1574 /* hardware does not support an input mode */
1575 return -ENOTSUPP;
1576 }
1577
1578 /* push-pull pins cannot be changed to be inputs */
1579 if (priv->gpio_pushpull & BIT(gpio))
1580 return -EINVAL;
1581
1582 /* make sure to release pin if it is being driven low */
1583 cp210x_gpio_set(gc, gpio, value: 1);
1584
1585 priv->gpio_input |= BIT(gpio);
1586
1587 return 0;
1588}
1589
1590static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1591 int value)
1592{
1593 struct usb_serial *serial = gpiochip_get_data(gc);
1594 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1595
1596 priv->gpio_input &= ~BIT(gpio);
1597 cp210x_gpio_set(gc, gpio, value);
1598
1599 return 0;
1600}
1601
1602static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
1603 unsigned long config)
1604{
1605 struct usb_serial *serial = gpiochip_get_data(gc);
1606 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1607 enum pin_config_param param = pinconf_to_config_param(config);
1608
1609 /* Succeed only if in correct mode (this can't be set at runtime) */
1610 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) &&
1611 (priv->gpio_pushpull & BIT(gpio)))
1612 return 0;
1613
1614 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) &&
1615 !(priv->gpio_pushpull & BIT(gpio)))
1616 return 0;
1617
1618 return -ENOTSUPP;
1619}
1620
1621static int cp210x_gpio_init_valid_mask(struct gpio_chip *gc,
1622 unsigned long *valid_mask, unsigned int ngpios)
1623{
1624 struct usb_serial *serial = gpiochip_get_data(gc);
1625 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1626 struct device *dev = &serial->interface->dev;
1627 unsigned long altfunc_mask = priv->gpio_altfunc;
1628
1629 bitmap_complement(dst: valid_mask, src: &altfunc_mask, nbits: ngpios);
1630
1631 if (bitmap_empty(src: valid_mask, nbits: ngpios))
1632 dev_dbg(dev, "no pin configured for GPIO\n");
1633 else
1634 dev_dbg(dev, "GPIO.%*pbl configured for GPIO\n", ngpios,
1635 valid_mask);
1636 return 0;
1637}
1638
1639/*
1640 * This function is for configuring GPIO using shared pins, where other signals
1641 * are made unavailable by configuring the use of GPIO. This is believed to be
1642 * only applicable to the cp2105 at this point, the other devices supported by
1643 * this driver that provide GPIO do so in a way that does not impact other
1644 * signals and are thus expected to have very different initialisation.
1645 */
1646static int cp2105_gpioconf_init(struct usb_serial *serial)
1647{
1648 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1649 struct cp210x_pin_mode mode;
1650 struct cp210x_dual_port_config config;
1651 u8 intf_num = cp210x_interface_num(serial);
1652 u8 iface_config;
1653 int result;
1654
1655 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1656 CP210X_GET_DEVICEMODE, buf: &mode,
1657 bufsize: sizeof(mode));
1658 if (result < 0)
1659 return result;
1660
1661 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1662 CP210X_GET_PORTCONFIG, buf: &config,
1663 bufsize: sizeof(config));
1664 if (result < 0)
1665 return result;
1666
1667 /* 2 banks of GPIO - One for the pins taken from each serial port */
1668 if (intf_num == 0) {
1669 priv->gc.ngpio = 2;
1670
1671 if (mode.eci == CP210X_PIN_MODE_MODEM) {
1672 /* mark all GPIOs of this interface as reserved */
1673 priv->gpio_altfunc = 0xff;
1674 return 0;
1675 }
1676
1677 iface_config = config.eci_cfg;
1678 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1679 CP210X_ECI_GPIO_MODE_MASK) >>
1680 CP210X_ECI_GPIO_MODE_OFFSET);
1681 } else if (intf_num == 1) {
1682 priv->gc.ngpio = 3;
1683
1684 if (mode.sci == CP210X_PIN_MODE_MODEM) {
1685 /* mark all GPIOs of this interface as reserved */
1686 priv->gpio_altfunc = 0xff;
1687 return 0;
1688 }
1689
1690 iface_config = config.sci_cfg;
1691 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1692 CP210X_SCI_GPIO_MODE_MASK) >>
1693 CP210X_SCI_GPIO_MODE_OFFSET);
1694 } else {
1695 return -ENODEV;
1696 }
1697
1698 /* mark all pins which are not in GPIO mode */
1699 if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */
1700 priv->gpio_altfunc |= BIT(0);
1701 if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */
1702 CP2105_GPIO1_RS485_MODE))
1703 priv->gpio_altfunc |= BIT(1);
1704
1705 /* driver implementation for CP2105 only supports outputs */
1706 priv->gpio_input = 0;
1707
1708 return 0;
1709}
1710
1711static int cp2104_gpioconf_init(struct usb_serial *serial)
1712{
1713 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1714 struct cp210x_single_port_config config;
1715 u8 iface_config;
1716 u8 gpio_latch;
1717 int result;
1718 u8 i;
1719
1720 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1721 CP210X_GET_PORTCONFIG, buf: &config,
1722 bufsize: sizeof(config));
1723 if (result < 0)
1724 return result;
1725
1726 priv->gc.ngpio = 4;
1727
1728 iface_config = config.device_cfg;
1729 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1730 CP210X_GPIO_MODE_MASK) >>
1731 CP210X_GPIO_MODE_OFFSET);
1732 gpio_latch = (u8)((le16_to_cpu(config.reset_state) &
1733 CP210X_GPIO_MODE_MASK) >>
1734 CP210X_GPIO_MODE_OFFSET);
1735
1736 /* mark all pins which are not in GPIO mode */
1737 if (iface_config & CP2104_GPIO0_TXLED_MODE) /* GPIO 0 */
1738 priv->gpio_altfunc |= BIT(0);
1739 if (iface_config & CP2104_GPIO1_RXLED_MODE) /* GPIO 1 */
1740 priv->gpio_altfunc |= BIT(1);
1741 if (iface_config & CP2104_GPIO2_RS485_MODE) /* GPIO 2 */
1742 priv->gpio_altfunc |= BIT(2);
1743
1744 /*
1745 * Like CP2102N, CP2104 has also no strict input and output pin
1746 * modes.
1747 * Do the same input mode emulation as CP2102N.
1748 */
1749 for (i = 0; i < priv->gc.ngpio; ++i) {
1750 /*
1751 * Set direction to "input" iff pin is open-drain and reset
1752 * value is 1.
1753 */
1754 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1755 priv->gpio_input |= BIT(i);
1756 }
1757
1758 return 0;
1759}
1760
1761static int cp2108_gpio_init(struct usb_serial *serial)
1762{
1763 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1764 struct cp210x_quad_port_config config;
1765 u16 gpio_latch;
1766 int result;
1767 u8 i;
1768
1769 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1770 CP210X_GET_PORTCONFIG, buf: &config,
1771 bufsize: sizeof(config));
1772 if (result < 0)
1773 return result;
1774
1775 priv->gc.ngpio = 16;
1776 priv->gpio_pushpull = le16_to_cpu(config.reset_state.gpio_mode_pb1);
1777 gpio_latch = le16_to_cpu(config.reset_state.gpio_latch_pb1);
1778
1779 /*
1780 * Mark all pins which are not in GPIO mode.
1781 *
1782 * Refer to table 9.1 "GPIO Mode alternate Functions" in the datasheet:
1783 * https://www.silabs.com/documents/public/data-sheets/cp2108-datasheet.pdf
1784 *
1785 * Alternate functions of GPIO0 to GPIO3 are determine by enhancedfxn_ifc[0]
1786 * and the similarly for the other pins; enhancedfxn_ifc[1]: GPIO4 to GPIO7,
1787 * enhancedfxn_ifc[2]: GPIO8 to GPIO11, enhancedfxn_ifc[3]: GPIO12 to GPIO15.
1788 */
1789 for (i = 0; i < 4; i++) {
1790 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_TXLED)
1791 priv->gpio_altfunc |= BIT(i * 4);
1792 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RXLED)
1793 priv->gpio_altfunc |= BIT((i * 4) + 1);
1794 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RS485)
1795 priv->gpio_altfunc |= BIT((i * 4) + 2);
1796 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_CLOCK)
1797 priv->gpio_altfunc |= BIT((i * 4) + 3);
1798 }
1799
1800 /*
1801 * Like CP2102N, CP2108 has also no strict input and output pin
1802 * modes. Do the same input mode emulation as CP2102N.
1803 */
1804 for (i = 0; i < priv->gc.ngpio; ++i) {
1805 /*
1806 * Set direction to "input" iff pin is open-drain and reset
1807 * value is 1.
1808 */
1809 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1810 priv->gpio_input |= BIT(i);
1811 }
1812
1813 return 0;
1814}
1815
1816static int cp2102n_gpioconf_init(struct usb_serial *serial)
1817{
1818 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1819 const u16 config_size = 0x02a6;
1820 u8 gpio_rst_latch;
1821 u8 config_version;
1822 u8 gpio_pushpull;
1823 u8 *config_buf;
1824 u8 gpio_latch;
1825 u8 gpio_ctrl;
1826 int result;
1827 u8 i;
1828
1829 /*
1830 * Retrieve device configuration from the device.
1831 * The array received contains all customization settings done at the
1832 * factory/manufacturer. Format of the array is documented at the
1833 * time of writing at:
1834 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa
1835 */
1836 config_buf = kmalloc(size: config_size, GFP_KERNEL);
1837 if (!config_buf)
1838 return -ENOMEM;
1839
1840 result = cp210x_read_vendor_block(serial,
1841 REQTYPE_DEVICE_TO_HOST,
1842 CP210X_READ_2NCONFIG,
1843 buf: config_buf,
1844 bufsize: config_size);
1845 if (result < 0) {
1846 kfree(objp: config_buf);
1847 return result;
1848 }
1849
1850 config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX];
1851 gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX];
1852 gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX];
1853 gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX];
1854
1855 kfree(objp: config_buf);
1856
1857 /* Make sure this is a config format we understand. */
1858 if (config_version != 0x01)
1859 return -ENOTSUPP;
1860
1861 priv->gc.ngpio = 4;
1862
1863 /*
1864 * Get default pin states after reset. Needed so we can determine
1865 * the direction of an open-drain pin.
1866 */
1867 gpio_latch = (gpio_rst_latch >> 3) & 0x0f;
1868
1869 /* 0 indicates open-drain mode, 1 is push-pull */
1870 priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f;
1871
1872 /* 0 indicates GPIO mode, 1 is alternate function */
1873 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN20) {
1874 /* QFN20 is special... */
1875 if (gpio_ctrl & CP2102N_QFN20_GPIO0_CLK_MODE) /* GPIO 0 */
1876 priv->gpio_altfunc |= BIT(0);
1877 if (gpio_ctrl & CP2102N_QFN20_GPIO1_RS485_MODE) /* GPIO 1 */
1878 priv->gpio_altfunc |= BIT(1);
1879 if (gpio_ctrl & CP2102N_QFN20_GPIO2_TXLED_MODE) /* GPIO 2 */
1880 priv->gpio_altfunc |= BIT(2);
1881 if (gpio_ctrl & CP2102N_QFN20_GPIO3_RXLED_MODE) /* GPIO 3 */
1882 priv->gpio_altfunc |= BIT(3);
1883 } else {
1884 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f;
1885 }
1886
1887 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) {
1888 /*
1889 * For the QFN28 package, GPIO4-6 are controlled by
1890 * the low three bits of the mode/latch fields.
1891 * Contrary to the document linked above, the bits for
1892 * the SUSPEND pins are elsewhere. No alternate
1893 * function is available for these pins.
1894 */
1895 priv->gc.ngpio = 7;
1896 gpio_latch |= (gpio_rst_latch & 7) << 4;
1897 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4;
1898 }
1899
1900 /*
1901 * The CP2102N does not strictly has input and output pin modes,
1902 * it only knows open-drain and push-pull modes which is set at
1903 * factory. An open-drain pin can function both as an
1904 * input or an output. We emulate input mode for open-drain pins
1905 * by making sure they are not driven low, and we do not allow
1906 * push-pull pins to be set as an input.
1907 */
1908 for (i = 0; i < priv->gc.ngpio; ++i) {
1909 /*
1910 * Set direction to "input" iff pin is open-drain and reset
1911 * value is 1.
1912 */
1913 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1914 priv->gpio_input |= BIT(i);
1915 }
1916
1917 return 0;
1918}
1919
1920static int cp210x_gpio_init(struct usb_serial *serial)
1921{
1922 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1923 int result;
1924
1925 switch (priv->partnum) {
1926 case CP210X_PARTNUM_CP2104:
1927 result = cp2104_gpioconf_init(serial);
1928 break;
1929 case CP210X_PARTNUM_CP2105:
1930 result = cp2105_gpioconf_init(serial);
1931 break;
1932 case CP210X_PARTNUM_CP2108:
1933 /*
1934 * The GPIOs are not tied to any specific port so only register
1935 * once for interface 0.
1936 */
1937 if (cp210x_interface_num(serial) != 0)
1938 return 0;
1939 result = cp2108_gpio_init(serial);
1940 break;
1941 case CP210X_PARTNUM_CP2102N_QFN28:
1942 case CP210X_PARTNUM_CP2102N_QFN24:
1943 case CP210X_PARTNUM_CP2102N_QFN20:
1944 result = cp2102n_gpioconf_init(serial);
1945 break;
1946 default:
1947 return 0;
1948 }
1949
1950 if (result < 0)
1951 return result;
1952
1953 priv->gc.label = "cp210x";
1954 priv->gc.get_direction = cp210x_gpio_direction_get;
1955 priv->gc.direction_input = cp210x_gpio_direction_input;
1956 priv->gc.direction_output = cp210x_gpio_direction_output;
1957 priv->gc.get = cp210x_gpio_get;
1958 priv->gc.set = cp210x_gpio_set;
1959 priv->gc.set_config = cp210x_gpio_set_config;
1960 priv->gc.init_valid_mask = cp210x_gpio_init_valid_mask;
1961 priv->gc.owner = THIS_MODULE;
1962 priv->gc.parent = &serial->interface->dev;
1963 priv->gc.base = -1;
1964 priv->gc.can_sleep = true;
1965
1966 result = gpiochip_add_data(&priv->gc, serial);
1967 if (!result)
1968 priv->gpio_registered = true;
1969
1970 return result;
1971}
1972
1973static void cp210x_gpio_remove(struct usb_serial *serial)
1974{
1975 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1976
1977 if (priv->gpio_registered) {
1978 gpiochip_remove(gc: &priv->gc);
1979 priv->gpio_registered = false;
1980 }
1981}
1982
1983#else
1984
1985static int cp210x_gpio_init(struct usb_serial *serial)
1986{
1987 return 0;
1988}
1989
1990static void cp210x_gpio_remove(struct usb_serial *serial)
1991{
1992 /* Nothing to do */
1993}
1994
1995#endif
1996
1997static int cp210x_port_probe(struct usb_serial_port *port)
1998{
1999 struct usb_serial *serial = port->serial;
2000 struct cp210x_port_private *port_priv;
2001
2002 port_priv = kzalloc(size: sizeof(*port_priv), GFP_KERNEL);
2003 if (!port_priv)
2004 return -ENOMEM;
2005
2006 port_priv->bInterfaceNumber = cp210x_interface_num(serial);
2007 mutex_init(&port_priv->mutex);
2008
2009 usb_set_serial_port_data(port, data: port_priv);
2010
2011 return 0;
2012}
2013
2014static void cp210x_port_remove(struct usb_serial_port *port)
2015{
2016 struct cp210x_port_private *port_priv;
2017
2018 port_priv = usb_get_serial_port_data(port);
2019 kfree(objp: port_priv);
2020}
2021
2022static void cp210x_init_max_speed(struct usb_serial *serial)
2023{
2024 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2025 bool use_actual_rate = false;
2026 speed_t min = 300;
2027 speed_t max;
2028
2029 switch (priv->partnum) {
2030 case CP210X_PARTNUM_CP2101:
2031 max = 921600;
2032 break;
2033 case CP210X_PARTNUM_CP2102:
2034 case CP210X_PARTNUM_CP2103:
2035 max = 1000000;
2036 break;
2037 case CP210X_PARTNUM_CP2104:
2038 use_actual_rate = true;
2039 max = 2000000;
2040 break;
2041 case CP210X_PARTNUM_CP2108:
2042 max = 2000000;
2043 break;
2044 case CP210X_PARTNUM_CP2105:
2045 if (cp210x_interface_num(serial) == 0) {
2046 use_actual_rate = true;
2047 max = 2000000; /* ECI */
2048 } else {
2049 min = 2400;
2050 max = 921600; /* SCI */
2051 }
2052 break;
2053 case CP210X_PARTNUM_CP2102N_QFN28:
2054 case CP210X_PARTNUM_CP2102N_QFN24:
2055 case CP210X_PARTNUM_CP2102N_QFN20:
2056 use_actual_rate = true;
2057 max = 3000000;
2058 break;
2059 default:
2060 max = 2000000;
2061 break;
2062 }
2063
2064 priv->min_speed = min;
2065 priv->max_speed = max;
2066 priv->use_actual_rate = use_actual_rate;
2067}
2068
2069static void cp2102_determine_quirks(struct usb_serial *serial)
2070{
2071 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2072 u8 *buf;
2073 int ret;
2074
2075 buf = kmalloc(size: 2, GFP_KERNEL);
2076 if (!buf)
2077 return;
2078 /*
2079 * Some (possibly counterfeit) CP2102 do not support event-insertion
2080 * mode and respond differently to malformed vendor requests.
2081 * Specifically, they return one instead of two bytes when sent a
2082 * two-byte part-number request.
2083 */
2084 ret = usb_control_msg(dev: serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2085 CP210X_VENDOR_SPECIFIC, REQTYPE_DEVICE_TO_HOST,
2086 CP210X_GET_PARTNUM, index: 0, data: buf, size: 2, USB_CTRL_GET_TIMEOUT);
2087 if (ret == 1) {
2088 dev_dbg(&serial->interface->dev,
2089 "device does not support event-insertion mode\n");
2090 priv->no_event_mode = true;
2091 }
2092
2093 kfree(objp: buf);
2094}
2095
2096static int cp210x_get_fw_version(struct usb_serial *serial, u16 value)
2097{
2098 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2099 u8 ver[3];
2100 int ret;
2101
2102 ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, val: value,
2103 buf: ver, bufsize: sizeof(ver));
2104 if (ret)
2105 return ret;
2106
2107 dev_dbg(&serial->interface->dev, "%s - %d.%d.%d\n", __func__,
2108 ver[0], ver[1], ver[2]);
2109
2110 priv->fw_version = ver[0] << 16 | ver[1] << 8 | ver[2];
2111
2112 return 0;
2113}
2114
2115static void cp210x_determine_type(struct usb_serial *serial)
2116{
2117 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2118 int ret;
2119
2120 ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
2121 CP210X_GET_PARTNUM, buf: &priv->partnum,
2122 bufsize: sizeof(priv->partnum));
2123 if (ret < 0) {
2124 dev_warn(&serial->interface->dev,
2125 "querying part number failed\n");
2126 priv->partnum = CP210X_PARTNUM_UNKNOWN;
2127 return;
2128 }
2129
2130 dev_dbg(&serial->interface->dev, "partnum = 0x%02x\n", priv->partnum);
2131
2132 switch (priv->partnum) {
2133 case CP210X_PARTNUM_CP2102:
2134 cp2102_determine_quirks(serial);
2135 break;
2136 case CP210X_PARTNUM_CP2105:
2137 case CP210X_PARTNUM_CP2108:
2138 cp210x_get_fw_version(serial, CP210X_GET_FW_VER);
2139 break;
2140 case CP210X_PARTNUM_CP2102N_QFN28:
2141 case CP210X_PARTNUM_CP2102N_QFN24:
2142 case CP210X_PARTNUM_CP2102N_QFN20:
2143 ret = cp210x_get_fw_version(serial, CP210X_GET_FW_VER_2N);
2144 if (ret)
2145 break;
2146 if (priv->fw_version <= 0x10004)
2147 priv->no_flow_control = true;
2148 break;
2149 default:
2150 break;
2151 }
2152}
2153
2154static int cp210x_attach(struct usb_serial *serial)
2155{
2156 int result;
2157 struct cp210x_serial_private *priv;
2158
2159 priv = kzalloc(size: sizeof(*priv), GFP_KERNEL);
2160 if (!priv)
2161 return -ENOMEM;
2162
2163 usb_set_serial_data(serial, data: priv);
2164
2165 cp210x_determine_type(serial);
2166 cp210x_init_max_speed(serial);
2167
2168 result = cp210x_gpio_init(serial);
2169 if (result < 0) {
2170 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n",
2171 result);
2172 }
2173
2174 return 0;
2175}
2176
2177static void cp210x_disconnect(struct usb_serial *serial)
2178{
2179 cp210x_gpio_remove(serial);
2180}
2181
2182static void cp210x_release(struct usb_serial *serial)
2183{
2184 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2185
2186 cp210x_gpio_remove(serial);
2187
2188 kfree(objp: priv);
2189}
2190
2191module_usb_serial_driver(serial_drivers, id_table);
2192
2193MODULE_DESCRIPTION(DRIVER_DESC);
2194MODULE_LICENSE("GPL v2");
2195

source code of linux/drivers/usb/serial/cp210x.c