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Merge tag 'trace-printf-v6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/trace...
[drm/drm-misc.git] / drivers / usb / serial / cp210x.c
blobc24101f0a07ad1b316ff800c487fa56960d91584
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 .name = "cp210x",
303 },
304 .id_table = id_table,
305 .num_ports = 1,
306 .bulk_in_size = 256,
307 .bulk_out_size = 256,
308 .open = cp210x_open,
309 .close = cp210x_close,
310 .break_ctl = cp210x_break_ctl,
311 .set_termios = cp210x_set_termios,
312 .tx_empty = cp210x_tx_empty,
313 .throttle = usb_serial_generic_throttle,
314 .unthrottle = usb_serial_generic_unthrottle,
315 .tiocmget = cp210x_tiocmget,
316 .tiocmset = cp210x_tiocmset,
317 .get_icount = usb_serial_generic_get_icount,
318 .attach = cp210x_attach,
319 .disconnect = cp210x_disconnect,
320 .release = cp210x_release,
321 .port_probe = cp210x_port_probe,
322 .port_remove = cp210x_port_remove,
323 .dtr_rts = cp210x_dtr_rts,
324 .process_read_urb = cp210x_process_read_urb,
325 };
326
327 static struct usb_serial_driver * const serial_drivers[] = {
328 &cp210x_device, NULL
329 };
330
331 /* Config request types */
332 #define REQTYPE_HOST_TO_INTERFACE 0x41
333 #define REQTYPE_INTERFACE_TO_HOST 0xc1
334 #define REQTYPE_HOST_TO_DEVICE 0x40
335 #define REQTYPE_DEVICE_TO_HOST 0xc0
336
337 /* Config request codes */
338 #define CP210X_IFC_ENABLE 0x00
339 #define CP210X_SET_BAUDDIV 0x01
340 #define CP210X_GET_BAUDDIV 0x02
341 #define CP210X_SET_LINE_CTL 0x03
342 #define CP210X_GET_LINE_CTL 0x04
343 #define CP210X_SET_BREAK 0x05
344 #define CP210X_IMM_CHAR 0x06
345 #define CP210X_SET_MHS 0x07
346 #define CP210X_GET_MDMSTS 0x08
347 #define CP210X_SET_XON 0x09
348 #define CP210X_SET_XOFF 0x0A
349 #define CP210X_SET_EVENTMASK 0x0B
350 #define CP210X_GET_EVENTMASK 0x0C
351 #define CP210X_SET_CHAR 0x0D
352 #define CP210X_GET_CHARS 0x0E
353 #define CP210X_GET_PROPS 0x0F
354 #define CP210X_GET_COMM_STATUS 0x10
355 #define CP210X_RESET 0x11
356 #define CP210X_PURGE 0x12
357 #define CP210X_SET_FLOW 0x13
358 #define CP210X_GET_FLOW 0x14
359 #define CP210X_EMBED_EVENTS 0x15
360 #define CP210X_GET_EVENTSTATE 0x16
361 #define CP210X_SET_CHARS 0x19
362 #define CP210X_GET_BAUDRATE 0x1D
363 #define CP210X_SET_BAUDRATE 0x1E
364 #define CP210X_VENDOR_SPECIFIC 0xFF
365
366 /* CP210X_IFC_ENABLE */
367 #define UART_ENABLE 0x0001
368 #define UART_DISABLE 0x0000
369
370 /* CP210X_(SET|GET)_BAUDDIV */
371 #define BAUD_RATE_GEN_FREQ 0x384000
372
373 /* CP210X_(SET|GET)_LINE_CTL */
374 #define BITS_DATA_MASK 0X0f00
375 #define BITS_DATA_5 0X0500
376 #define BITS_DATA_6 0X0600
377 #define BITS_DATA_7 0X0700
378 #define BITS_DATA_8 0X0800
379 #define BITS_DATA_9 0X0900
380
381 #define BITS_PARITY_MASK 0x00f0
382 #define BITS_PARITY_NONE 0x0000
383 #define BITS_PARITY_ODD 0x0010
384 #define BITS_PARITY_EVEN 0x0020
385 #define BITS_PARITY_MARK 0x0030
386 #define BITS_PARITY_SPACE 0x0040
387
388 #define BITS_STOP_MASK 0x000f
389 #define BITS_STOP_1 0x0000
390 #define BITS_STOP_1_5 0x0001
391 #define BITS_STOP_2 0x0002
392
393 /* CP210X_SET_BREAK */
394 #define BREAK_ON 0x0001
395 #define BREAK_OFF 0x0000
396
397 /* CP210X_(SET_MHS|GET_MDMSTS) */
398 #define CONTROL_DTR 0x0001
399 #define CONTROL_RTS 0x0002
400 #define CONTROL_CTS 0x0010
401 #define CONTROL_DSR 0x0020
402 #define CONTROL_RING 0x0040
403 #define CONTROL_DCD 0x0080
404 #define CONTROL_WRITE_DTR 0x0100
405 #define CONTROL_WRITE_RTS 0x0200
406
407 /* CP210X_(GET|SET)_CHARS */
408 struct cp210x_special_chars {
409 u8 bEofChar;
410 u8 bErrorChar;
411 u8 bBreakChar;
412 u8 bEventChar;
413 u8 bXonChar;
414 u8 bXoffChar;
415 };
416
417 /* CP210X_VENDOR_SPECIFIC values */
418 #define CP210X_GET_FW_VER 0x000E
419 #define CP210X_READ_2NCONFIG 0x000E
420 #define CP210X_GET_FW_VER_2N 0x0010
421 #define CP210X_READ_LATCH 0x00C2
422 #define CP210X_GET_PARTNUM 0x370B
423 #define CP210X_GET_PORTCONFIG 0x370C
424 #define CP210X_GET_DEVICEMODE 0x3711
425 #define CP210X_WRITE_LATCH 0x37E1
426
427 /* Part number definitions */
428 #define CP210X_PARTNUM_CP2101 0x01
429 #define CP210X_PARTNUM_CP2102 0x02
430 #define CP210X_PARTNUM_CP2103 0x03
431 #define CP210X_PARTNUM_CP2104 0x04
432 #define CP210X_PARTNUM_CP2105 0x05
433 #define CP210X_PARTNUM_CP2108 0x08
434 #define CP210X_PARTNUM_CP2102N_QFN28 0x20
435 #define CP210X_PARTNUM_CP2102N_QFN24 0x21
436 #define CP210X_PARTNUM_CP2102N_QFN20 0x22
437 #define CP210X_PARTNUM_UNKNOWN 0xFF
438
439 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
440 struct cp210x_comm_status {
441 __le32 ulErrors;
442 __le32 ulHoldReasons;
443 __le32 ulAmountInInQueue;
444 __le32 ulAmountInOutQueue;
445 u8 bEofReceived;
446 u8 bWaitForImmediate;
447 u8 bReserved;
448 } __packed;
449
450 /*
451 * CP210X_PURGE - 16 bits passed in wValue of USB request.
452 * SiLabs app note AN571 gives a strange description of the 4 bits:
453 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
454 * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
455 */
456 #define PURGE_ALL 0x000f
457
458 /* CP210X_EMBED_EVENTS */
459 #define CP210X_ESCCHAR 0xec
460
461 #define CP210X_LSR_OVERRUN BIT(1)
462 #define CP210X_LSR_PARITY BIT(2)
463 #define CP210X_LSR_FRAME BIT(3)
464 #define CP210X_LSR_BREAK BIT(4)
465
466
467 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
468 struct cp210x_flow_ctl {
469 __le32 ulControlHandshake;
470 __le32 ulFlowReplace;
471 __le32 ulXonLimit;
472 __le32 ulXoffLimit;
473 };
474
475 /* cp210x_flow_ctl::ulControlHandshake */
476 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0)
477 #define CP210X_SERIAL_DTR_INACTIVE (0 << 0)
478 #define CP210X_SERIAL_DTR_ACTIVE (1 << 0)
479 #define CP210X_SERIAL_DTR_FLOW_CTL (2 << 0)
480 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3)
481 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4)
482 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5)
483 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6)
484
485 /* cp210x_flow_ctl::ulFlowReplace */
486 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0)
487 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1)
488 #define CP210X_SERIAL_ERROR_CHAR BIT(2)
489 #define CP210X_SERIAL_NULL_STRIPPING BIT(3)
490 #define CP210X_SERIAL_BREAK_CHAR BIT(4)
491 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6)
492 #define CP210X_SERIAL_RTS_INACTIVE (0 << 6)
493 #define CP210X_SERIAL_RTS_ACTIVE (1 << 6)
494 #define CP210X_SERIAL_RTS_FLOW_CTL (2 << 6)
495 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31)
496
497 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
498 struct cp210x_pin_mode {
499 u8 eci;
500 u8 sci;
501 };
502
503 #define CP210X_PIN_MODE_MODEM 0
504 #define CP210X_PIN_MODE_GPIO BIT(0)
505
506 /*
507 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes
508 * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes.
509 */
510 struct cp210x_dual_port_config {
511 __le16 gpio_mode;
512 u8 __pad0[2];
513 __le16 reset_state;
514 u8 __pad1[4];
515 __le16 suspend_state;
516 u8 sci_cfg;
517 u8 eci_cfg;
518 u8 device_cfg;
519 } __packed;
520
521 /*
522 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes
523 * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes.
524 */
525 struct cp210x_single_port_config {
526 __le16 gpio_mode;
527 u8 __pad0[2];
528 __le16 reset_state;
529 u8 __pad1[4];
530 __le16 suspend_state;
531 u8 device_cfg;
532 } __packed;
533
534 /* GPIO modes */
535 #define CP210X_SCI_GPIO_MODE_OFFSET 9
536 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9)
537
538 #define CP210X_ECI_GPIO_MODE_OFFSET 2
539 #define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2)
540
541 #define CP210X_GPIO_MODE_OFFSET 8
542 #define CP210X_GPIO_MODE_MASK GENMASK(11, 8)
543
544 /* CP2105 port configuration values */
545 #define CP2105_GPIO0_TXLED_MODE BIT(0)
546 #define CP2105_GPIO1_RXLED_MODE BIT(1)
547 #define CP2105_GPIO1_RS485_MODE BIT(2)
548
549 /* CP2104 port configuration values */
550 #define CP2104_GPIO0_TXLED_MODE BIT(0)
551 #define CP2104_GPIO1_RXLED_MODE BIT(1)
552 #define CP2104_GPIO2_RS485_MODE BIT(2)
553
554 struct cp210x_quad_port_state {
555 __le16 gpio_mode_pb0;
556 __le16 gpio_mode_pb1;
557 __le16 gpio_mode_pb2;
558 __le16 gpio_mode_pb3;
559 __le16 gpio_mode_pb4;
560
561 __le16 gpio_lowpower_pb0;
562 __le16 gpio_lowpower_pb1;
563 __le16 gpio_lowpower_pb2;
564 __le16 gpio_lowpower_pb3;
565 __le16 gpio_lowpower_pb4;
566
567 __le16 gpio_latch_pb0;
568 __le16 gpio_latch_pb1;
569 __le16 gpio_latch_pb2;
570 __le16 gpio_latch_pb3;
571 __le16 gpio_latch_pb4;
572 };
573
574 /*
575 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0x49 bytes
576 * on a CP2108 chip.
577 *
578 * See https://www.silabs.com/documents/public/application-notes/an978-cp210x-usb-to-uart-api-specification.pdf
579 */
580 struct cp210x_quad_port_config {
581 struct cp210x_quad_port_state reset_state;
582 struct cp210x_quad_port_state suspend_state;
583 u8 ipdelay_ifc[4];
584 u8 enhancedfxn_ifc[4];
585 u8 enhancedfxn_device;
586 u8 extclkfreq[4];
587 } __packed;
588
589 #define CP2108_EF_IFC_GPIO_TXLED 0x01
590 #define CP2108_EF_IFC_GPIO_RXLED 0x02
591 #define CP2108_EF_IFC_GPIO_RS485 0x04
592 #define CP2108_EF_IFC_GPIO_RS485_LOGIC 0x08
593 #define CP2108_EF_IFC_GPIO_CLOCK 0x10
594 #define CP2108_EF_IFC_DYNAMIC_SUSPEND 0x40
595
596 /* CP2102N configuration array indices */
597 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX 2
598 #define CP210X_2NCONFIG_GPIO_MODE_IDX 581
599 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587
600 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600
601
602 /* CP2102N QFN20 port configuration values */
603 #define CP2102N_QFN20_GPIO2_TXLED_MODE BIT(2)
604 #define CP2102N_QFN20_GPIO3_RXLED_MODE BIT(3)
605 #define CP2102N_QFN20_GPIO1_RS485_MODE BIT(4)
606 #define CP2102N_QFN20_GPIO0_CLK_MODE BIT(6)
607
608 /*
609 * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x02 bytes
610 * for CP2102N, CP2103, CP2104 and CP2105.
611 */
612 struct cp210x_gpio_write {
613 u8 mask;
614 u8 state;
615 };
616
617 /*
618 * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x04 bytes
619 * for CP2108.
620 */
621 struct cp210x_gpio_write16 {
622 __le16 mask;
623 __le16 state;
624 };
625
626 /*
627 * Helper to get interface number when we only have struct usb_serial.
628 */
629 static u8 cp210x_interface_num(struct usb_serial *serial)
630 {
631 struct usb_host_interface *cur_altsetting;
632
633 cur_altsetting = serial->interface->cur_altsetting;
634
635 return cur_altsetting->desc.bInterfaceNumber;
636 }
637
638 /*
639 * Reads a variable-sized block of CP210X_ registers, identified by req.
640 * Returns data into buf in native USB byte order.
641 */
642 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
643 void *buf, int bufsize)
644 {
645 struct usb_serial *serial = port->serial;
646 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
647 int result;
648
649
650 result = usb_control_msg_recv(serial->dev, 0, req,
651 REQTYPE_INTERFACE_TO_HOST, 0,
652 port_priv->bInterfaceNumber, buf, bufsize,
653 USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
654 if (result) {
655 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
656 req, bufsize, result);
657 return result;
658 }
659
660 return 0;
661 }
662
663 /*
664 * Reads any 8-bit CP210X_ register identified by req.
665 */
666 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
667 {
668 return cp210x_read_reg_block(port, req, val, sizeof(*val));
669 }
670
671 /*
672 * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
673 * Returns data into buf in native USB byte order.
674 */
675 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
676 void *buf, int bufsize)
677 {
678 int result;
679
680 result = usb_control_msg_recv(serial->dev, 0, CP210X_VENDOR_SPECIFIC,
681 type, val, cp210x_interface_num(serial), buf, bufsize,
682 USB_CTRL_GET_TIMEOUT, GFP_KERNEL);
683 if (result) {
684 dev_err(&serial->interface->dev,
685 "failed to get vendor val 0x%04x size %d: %d\n", val,
686 bufsize, result);
687 return result;
688 }
689
690 return 0;
691 }
692
693 /*
694 * Writes any 16-bit CP210X_ register (req) whose value is passed
695 * entirely in the wValue field of the USB request.
696 */
697 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
698 {
699 struct usb_serial *serial = port->serial;
700 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
701 int result;
702
703 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
704 req, REQTYPE_HOST_TO_INTERFACE, val,
705 port_priv->bInterfaceNumber, NULL, 0,
706 USB_CTRL_SET_TIMEOUT);
707 if (result < 0) {
708 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
709 req, result);
710 }
711
712 return result;
713 }
714
715 /*
716 * Writes a variable-sized block of CP210X_ registers, identified by req.
717 * Data in buf must be in native USB byte order.
718 */
719 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
720 void *buf, int bufsize)
721 {
722 struct usb_serial *serial = port->serial;
723 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
724 int result;
725
726 result = usb_control_msg_send(serial->dev, 0, req,
727 REQTYPE_HOST_TO_INTERFACE, 0,
728 port_priv->bInterfaceNumber, buf, bufsize,
729 USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
730 if (result) {
731 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
732 req, bufsize, result);
733 return result;
734 }
735
736 return 0;
737 }
738
739 /*
740 * Writes any 32-bit CP210X_ register identified by req.
741 */
742 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
743 {
744 __le32 le32_val;
745
746 le32_val = cpu_to_le32(val);
747
748 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
749 }
750
751 #ifdef CONFIG_GPIOLIB
752 /*
753 * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
754 * Data in buf must be in native USB byte order.
755 */
756 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
757 u16 val, void *buf, int bufsize)
758 {
759 int result;
760
761 result = usb_control_msg_send(serial->dev, 0, CP210X_VENDOR_SPECIFIC,
762 type, val, cp210x_interface_num(serial), buf, bufsize,
763 USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
764 if (result) {
765 dev_err(&serial->interface->dev,
766 "failed to set vendor val 0x%04x size %d: %d\n", val,
767 bufsize, result);
768 return result;
769 }
770
771 return 0;
772 }
773 #endif
774
775 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
776 {
777 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
778 int result;
779
780 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
781 if (result) {
782 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
783 return result;
784 }
785
786 if (tty)
787 cp210x_set_termios(tty, port, NULL);
788
789 result = usb_serial_generic_open(tty, port);
790 if (result)
791 goto err_disable;
792
793 return 0;
794
795 err_disable:
796 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
797 port_priv->event_mode = false;
798
799 return result;
800 }
801
802 static void cp210x_close(struct usb_serial_port *port)
803 {
804 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
805
806 usb_serial_generic_close(port);
807
808 /* Clear both queues; cp2108 needs this to avoid an occasional hang */
809 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
810
811 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
812
813 /* Disabling the interface disables event-insertion mode. */
814 port_priv->event_mode = false;
815 }
816
817 static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag)
818 {
819 if (lsr & CP210X_LSR_BREAK) {
820 port->icount.brk++;
821 *flag = TTY_BREAK;
822 } else if (lsr & CP210X_LSR_PARITY) {
823 port->icount.parity++;
824 *flag = TTY_PARITY;
825 } else if (lsr & CP210X_LSR_FRAME) {
826 port->icount.frame++;
827 *flag = TTY_FRAME;
828 }
829
830 if (lsr & CP210X_LSR_OVERRUN) {
831 port->icount.overrun++;
832 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
833 }
834 }
835
836 static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag)
837 {
838 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
839
840 switch (port_priv->event_state) {
841 case ES_DATA:
842 if (*ch == CP210X_ESCCHAR) {
843 port_priv->event_state = ES_ESCAPE;
844 break;
845 }
846 return false;
847 case ES_ESCAPE:
848 switch (*ch) {
849 case 0:
850 dev_dbg(&port->dev, "%s - escape char\n", __func__);
851 *ch = CP210X_ESCCHAR;
852 port_priv->event_state = ES_DATA;
853 return false;
854 case 1:
855 port_priv->event_state = ES_LSR_DATA_0;
856 break;
857 case 2:
858 port_priv->event_state = ES_LSR;
859 break;
860 case 3:
861 port_priv->event_state = ES_MSR;
862 break;
863 default:
864 dev_err(&port->dev, "malformed event 0x%02x\n", *ch);
865 port_priv->event_state = ES_DATA;
866 break;
867 }
868 break;
869 case ES_LSR_DATA_0:
870 port_priv->lsr = *ch;
871 port_priv->event_state = ES_LSR_DATA_1;
872 break;
873 case ES_LSR_DATA_1:
874 dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n",
875 __func__, port_priv->lsr, *ch);
876 cp210x_process_lsr(port, port_priv->lsr, flag);
877 port_priv->event_state = ES_DATA;
878 return false;
879 case ES_LSR:
880 dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch);
881 port_priv->lsr = *ch;
882 cp210x_process_lsr(port, port_priv->lsr, flag);
883 port_priv->event_state = ES_DATA;
884 break;
885 case ES_MSR:
886 dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch);
887 /* unimplemented */
888 port_priv->event_state = ES_DATA;
889 break;
890 }
891
892 return true;
893 }
894
895 static void cp210x_process_read_urb(struct urb *urb)
896 {
897 struct usb_serial_port *port = urb->context;
898 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
899 unsigned char *ch = urb->transfer_buffer;
900 char flag;
901 int i;
902
903 if (!urb->actual_length)
904 return;
905
906 if (port_priv->event_mode) {
907 for (i = 0; i < urb->actual_length; i++, ch++) {
908 flag = TTY_NORMAL;
909
910 if (cp210x_process_char(port, ch, &flag))
911 continue;
912
913 tty_insert_flip_char(&port->port, *ch, flag);
914 }
915 } else {
916 tty_insert_flip_string(&port->port, ch, urb->actual_length);
917 }
918 tty_flip_buffer_push(&port->port);
919 }
920
921 /*
922 * Read how many bytes are waiting in the TX queue.
923 */
924 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
925 u32 *count)
926 {
927 struct usb_serial *serial = port->serial;
928 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
929 struct cp210x_comm_status sts;
930 int result;
931
932 result = usb_control_msg_recv(serial->dev, 0, CP210X_GET_COMM_STATUS,
933 REQTYPE_INTERFACE_TO_HOST, 0,
934 port_priv->bInterfaceNumber, &sts, sizeof(sts),
935 USB_CTRL_GET_TIMEOUT, GFP_KERNEL);
936 if (result) {
937 dev_err(&port->dev, "failed to get comm status: %d\n", result);
938 return result;
939 }
940
941 *count = le32_to_cpu(sts.ulAmountInOutQueue);
942
943 return 0;
944 }
945
946 static bool cp210x_tx_empty(struct usb_serial_port *port)
947 {
948 int err;
949 u32 count;
950
951 err = cp210x_get_tx_queue_byte_count(port, &count);
952 if (err)
953 return true;
954
955 return !count;
956 }
957
958 struct cp210x_rate {
959 speed_t rate;
960 speed_t high;
961 };
962
963 static const struct cp210x_rate cp210x_an205_table1[] = {
964 { 300, 300 },
965 { 600, 600 },
966 { 1200, 1200 },
967 { 1800, 1800 },
968 { 2400, 2400 },
969 { 4000, 4000 },
970 { 4800, 4803 },
971 { 7200, 7207 },
972 { 9600, 9612 },
973 { 14400, 14428 },
974 { 16000, 16062 },
975 { 19200, 19250 },
976 { 28800, 28912 },
977 { 38400, 38601 },
978 { 51200, 51558 },
979 { 56000, 56280 },
980 { 57600, 58053 },
981 { 64000, 64111 },
982 { 76800, 77608 },
983 { 115200, 117028 },
984 { 128000, 129347 },
985 { 153600, 156868 },
986 { 230400, 237832 },
987 { 250000, 254234 },
988 { 256000, 273066 },
989 { 460800, 491520 },
990 { 500000, 567138 },
991 { 576000, 670254 },
992 { 921600, UINT_MAX }
993 };
994
995 /*
996 * Quantises the baud rate as per AN205 Table 1
997 */
998 static speed_t cp210x_get_an205_rate(speed_t baud)
999 {
1000 int i;
1001
1002 for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) {
1003 if (baud <= cp210x_an205_table1[i].high)
1004 break;
1005 }
1006
1007 return cp210x_an205_table1[i].rate;
1008 }
1009
1010 static speed_t cp210x_get_actual_rate(speed_t baud)
1011 {
1012 unsigned int prescale = 1;
1013 unsigned int div;
1014
1015 if (baud <= 365)
1016 prescale = 4;
1017
1018 div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud);
1019 baud = 48000000 / (2 * prescale * div);
1020
1021 return baud;
1022 }
1023
1024 /*
1025 * CP2101 supports the following baud rates:
1026 *
1027 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
1028 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
1029 *
1030 * CP2102 and CP2103 support the following additional rates:
1031 *
1032 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
1033 * 576000
1034 *
1035 * The device will map a requested rate to a supported one, but the result
1036 * of requests for rates greater than 1053257 is undefined (see AN205).
1037 *
1038 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
1039 * respectively, with an error less than 1%. The actual rates are determined
1040 * by
1041 *
1042 * div = round(freq / (2 x prescale x request))
1043 * actual = freq / (2 x prescale x div)
1044 *
1045 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1046 * or 1 otherwise.
1047 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1048 * otherwise.
1049 */
1050 static void cp210x_change_speed(struct tty_struct *tty,
1051 struct usb_serial_port *port,
1052 const struct ktermios *old_termios)
1053 {
1054 struct usb_serial *serial = port->serial;
1055 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1056 u32 baud;
1057
1058 if (tty->termios.c_ospeed == 0)
1059 return;
1060
1061 /*
1062 * This maps the requested rate to the actual rate, a valid rate on
1063 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed].
1064 */
1065 baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed);
1066
1067 if (priv->use_actual_rate)
1068 baud = cp210x_get_actual_rate(baud);
1069 else if (baud < 1000000)
1070 baud = cp210x_get_an205_rate(baud);
1071
1072 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1073 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1074 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1075 if (old_termios)
1076 baud = old_termios->c_ospeed;
1077 else
1078 baud = 9600;
1079 }
1080
1081 tty_encode_baud_rate(tty, baud, baud);
1082 }
1083
1084 static void cp210x_enable_event_mode(struct usb_serial_port *port)
1085 {
1086 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1087 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1088 int ret;
1089
1090 if (port_priv->event_mode)
1091 return;
1092
1093 if (priv->no_event_mode)
1094 return;
1095
1096 port_priv->event_state = ES_DATA;
1097 port_priv->event_mode = true;
1098
1099 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR);
1100 if (ret) {
1101 dev_err(&port->dev, "failed to enable events: %d\n", ret);
1102 port_priv->event_mode = false;
1103 }
1104 }
1105
1106 static void cp210x_disable_event_mode(struct usb_serial_port *port)
1107 {
1108 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1109 int ret;
1110
1111 if (!port_priv->event_mode)
1112 return;
1113
1114 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0);
1115 if (ret) {
1116 dev_err(&port->dev, "failed to disable events: %d\n", ret);
1117 return;
1118 }
1119
1120 port_priv->event_mode = false;
1121 }
1122
1123 static bool cp210x_termios_change(const struct ktermios *a, const struct ktermios *b)
1124 {
1125 bool iflag_change, cc_change;
1126
1127 iflag_change = ((a->c_iflag ^ b->c_iflag) & (INPCK | IXON | IXOFF));
1128 cc_change = a->c_cc[VSTART] != b->c_cc[VSTART] ||
1129 a->c_cc[VSTOP] != b->c_cc[VSTOP];
1130
1131 return tty_termios_hw_change(a, b) || iflag_change || cc_change;
1132 }
1133
1134 static void cp210x_set_flow_control(struct tty_struct *tty,
1135 struct usb_serial_port *port,
1136 const struct ktermios *old_termios)
1137 {
1138 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1139 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1140 struct cp210x_special_chars chars;
1141 struct cp210x_flow_ctl flow_ctl;
1142 u32 flow_repl;
1143 u32 ctl_hs;
1144 bool crtscts;
1145 int ret;
1146
1147 /*
1148 * Some CP2102N interpret ulXonLimit as ulFlowReplace (erratum
1149 * CP2102N_E104). Report back that flow control is not supported.
1150 */
1151 if (priv->no_flow_control) {
1152 tty->termios.c_cflag &= ~CRTSCTS;
1153 tty->termios.c_iflag &= ~(IXON | IXOFF);
1154 }
1155
1156 if (tty->termios.c_ospeed != 0 &&
1157 old_termios && old_termios->c_ospeed != 0 &&
1158 C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS) &&
1159 I_IXON(tty) == (old_termios->c_iflag & IXON) &&
1160 I_IXOFF(tty) == (old_termios->c_iflag & IXOFF) &&
1161 START_CHAR(tty) == old_termios->c_cc[VSTART] &&
1162 STOP_CHAR(tty) == old_termios->c_cc[VSTOP]) {
1163 return;
1164 }
1165
1166 if (I_IXON(tty) || I_IXOFF(tty)) {
1167 memset(&chars, 0, sizeof(chars));
1168
1169 chars.bXonChar = START_CHAR(tty);
1170 chars.bXoffChar = STOP_CHAR(tty);
1171
1172 ret = cp210x_write_reg_block(port, CP210X_SET_CHARS, &chars,
1173 sizeof(chars));
1174 if (ret) {
1175 dev_err(&port->dev, "failed to set special chars: %d\n",
1176 ret);
1177 }
1178 }
1179
1180 mutex_lock(&port_priv->mutex);
1181
1182 if (tty->termios.c_ospeed == 0) {
1183 port_priv->dtr = false;
1184 port_priv->rts = false;
1185 } else if (old_termios && old_termios->c_ospeed == 0) {
1186 port_priv->dtr = true;
1187 port_priv->rts = true;
1188 }
1189
1190 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1191 sizeof(flow_ctl));
1192 if (ret)
1193 goto out_unlock;
1194
1195 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1196 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1197
1198 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1199 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1200 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1201 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1202 if (port_priv->dtr)
1203 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE;
1204 else
1205 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE;
1206
1207 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1208 if (C_CRTSCTS(tty)) {
1209 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1210 if (port_priv->rts)
1211 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL;
1212 else
1213 flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1214 crtscts = true;
1215 } else {
1216 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1217 if (port_priv->rts)
1218 flow_repl |= CP210X_SERIAL_RTS_ACTIVE;
1219 else
1220 flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1221 crtscts = false;
1222 }
1223
1224 if (I_IXOFF(tty)) {
1225 flow_repl |= CP210X_SERIAL_AUTO_RECEIVE;
1226
1227 flow_ctl.ulXonLimit = cpu_to_le32(128);
1228 flow_ctl.ulXoffLimit = cpu_to_le32(128);
1229 } else {
1230 flow_repl &= ~CP210X_SERIAL_AUTO_RECEIVE;
1231 }
1232
1233 if (I_IXON(tty))
1234 flow_repl |= CP210X_SERIAL_AUTO_TRANSMIT;
1235 else
1236 flow_repl &= ~CP210X_SERIAL_AUTO_TRANSMIT;
1237
1238 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", __func__,
1239 ctl_hs, flow_repl);
1240
1241 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1242 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1243
1244 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1245 sizeof(flow_ctl));
1246 if (ret)
1247 goto out_unlock;
1248
1249 port_priv->crtscts = crtscts;
1250 out_unlock:
1251 mutex_unlock(&port_priv->mutex);
1252 }
1253
1254 static void cp210x_set_termios(struct tty_struct *tty,
1255 struct usb_serial_port *port,
1256 const struct ktermios *old_termios)
1257 {
1258 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1259 u16 bits;
1260 int ret;
1261
1262 if (old_termios && !cp210x_termios_change(&tty->termios, old_termios) &&
1263 tty->termios.c_ospeed != 0)
1264 return;
1265
1266 if (!old_termios || tty->termios.c_ospeed != old_termios->c_ospeed)
1267 cp210x_change_speed(tty, port, old_termios);
1268
1269 /* CP2101 only supports CS8, 1 stop bit and non-stick parity. */
1270 if (priv->partnum == CP210X_PARTNUM_CP2101) {
1271 tty->termios.c_cflag &= ~(CSIZE | CSTOPB | CMSPAR);
1272 tty->termios.c_cflag |= CS8;
1273 }
1274
1275 bits = 0;
1276
1277 switch (C_CSIZE(tty)) {
1278 case CS5:
1279 bits |= BITS_DATA_5;
1280 break;
1281 case CS6:
1282 bits |= BITS_DATA_6;
1283 break;
1284 case CS7:
1285 bits |= BITS_DATA_7;
1286 break;
1287 case CS8:
1288 default:
1289 bits |= BITS_DATA_8;
1290 break;
1291 }
1292
1293 if (C_PARENB(tty)) {
1294 if (C_CMSPAR(tty)) {
1295 if (C_PARODD(tty))
1296 bits |= BITS_PARITY_MARK;
1297 else
1298 bits |= BITS_PARITY_SPACE;
1299 } else {
1300 if (C_PARODD(tty))
1301 bits |= BITS_PARITY_ODD;
1302 else
1303 bits |= BITS_PARITY_EVEN;
1304 }
1305 }
1306
1307 if (C_CSTOPB(tty))
1308 bits |= BITS_STOP_2;
1309 else
1310 bits |= BITS_STOP_1;
1311
1312 ret = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1313 if (ret)
1314 dev_err(&port->dev, "failed to set line control: %d\n", ret);
1315
1316 cp210x_set_flow_control(tty, port, old_termios);
1317
1318 /*
1319 * Enable event-insertion mode only if input parity checking is
1320 * enabled for now.
1321 */
1322 if (I_INPCK(tty))
1323 cp210x_enable_event_mode(port);
1324 else
1325 cp210x_disable_event_mode(port);
1326 }
1327
1328 static int cp210x_tiocmset(struct tty_struct *tty,
1329 unsigned int set, unsigned int clear)
1330 {
1331 struct usb_serial_port *port = tty->driver_data;
1332 return cp210x_tiocmset_port(port, set, clear);
1333 }
1334
1335 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1336 unsigned int set, unsigned int clear)
1337 {
1338 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1339 struct cp210x_flow_ctl flow_ctl;
1340 u32 ctl_hs, flow_repl;
1341 u16 control = 0;
1342 int ret;
1343
1344 mutex_lock(&port_priv->mutex);
1345
1346 if (set & TIOCM_RTS) {
1347 port_priv->rts = true;
1348 control |= CONTROL_RTS;
1349 control |= CONTROL_WRITE_RTS;
1350 }
1351 if (set & TIOCM_DTR) {
1352 port_priv->dtr = true;
1353 control |= CONTROL_DTR;
1354 control |= CONTROL_WRITE_DTR;
1355 }
1356 if (clear & TIOCM_RTS) {
1357 port_priv->rts = false;
1358 control &= ~CONTROL_RTS;
1359 control |= CONTROL_WRITE_RTS;
1360 }
1361 if (clear & TIOCM_DTR) {
1362 port_priv->dtr = false;
1363 control &= ~CONTROL_DTR;
1364 control |= CONTROL_WRITE_DTR;
1365 }
1366
1367 /*
1368 * Use SET_FLOW to set DTR and enable/disable auto-RTS when hardware
1369 * flow control is enabled.
1370 */
1371 if (port_priv->crtscts && control & CONTROL_WRITE_RTS) {
1372 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1373 sizeof(flow_ctl));
1374 if (ret)
1375 goto out_unlock;
1376
1377 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1378 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1379
1380 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1381 if (port_priv->dtr)
1382 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE;
1383 else
1384 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE;
1385
1386 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1387 if (port_priv->rts)
1388 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL;
1389 else
1390 flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1391
1392 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1393 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1394
1395 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n",
1396 __func__, ctl_hs, flow_repl);
1397
1398 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1399 sizeof(flow_ctl));
1400 } else {
1401 dev_dbg(&port->dev, "%s - control = 0x%04x\n", __func__, control);
1402
1403 ret = cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1404 }
1405 out_unlock:
1406 mutex_unlock(&port_priv->mutex);
1407
1408 return ret;
1409 }
1410
1411 static void cp210x_dtr_rts(struct usb_serial_port *port, int on)
1412 {
1413 if (on)
1414 cp210x_tiocmset_port(port, TIOCM_DTR | TIOCM_RTS, 0);
1415 else
1416 cp210x_tiocmset_port(port, 0, TIOCM_DTR | TIOCM_RTS);
1417 }
1418
1419 static int cp210x_tiocmget(struct tty_struct *tty)
1420 {
1421 struct usb_serial_port *port = tty->driver_data;
1422 u8 control;
1423 int result;
1424
1425 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1426 if (result)
1427 return result;
1428
1429 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1430 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1431 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1432 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1433 |((control & CONTROL_RING)? TIOCM_RI : 0)
1434 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
1435
1436 dev_dbg(&port->dev, "%s - control = 0x%02x\n", __func__, control);
1437
1438 return result;
1439 }
1440
1441 static int cp210x_break_ctl(struct tty_struct *tty, int break_state)
1442 {
1443 struct usb_serial_port *port = tty->driver_data;
1444 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1445 u16 state;
1446
1447 if (priv->partnum == CP210X_PARTNUM_CP2105) {
1448 if (cp210x_interface_num(port->serial) == 1)
1449 return -ENOTTY;
1450 }
1451
1452 if (break_state == 0)
1453 state = BREAK_OFF;
1454 else
1455 state = BREAK_ON;
1456
1457 dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1458 state == BREAK_OFF ? "off" : "on");
1459
1460 return cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1461 }
1462
1463 #ifdef CONFIG_GPIOLIB
1464 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1465 {
1466 struct usb_serial *serial = gpiochip_get_data(gc);
1467 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1468 u8 req_type;
1469 u16 mask;
1470 int result;
1471 int len;
1472
1473 result = usb_autopm_get_interface(serial->interface);
1474 if (result)
1475 return result;
1476
1477 switch (priv->partnum) {
1478 case CP210X_PARTNUM_CP2105:
1479 req_type = REQTYPE_INTERFACE_TO_HOST;
1480 len = 1;
1481 break;
1482 case CP210X_PARTNUM_CP2108:
1483 req_type = REQTYPE_INTERFACE_TO_HOST;
1484 len = 2;
1485 break;
1486 default:
1487 req_type = REQTYPE_DEVICE_TO_HOST;
1488 len = 1;
1489 break;
1490 }
1491
1492 mask = 0;
1493 result = cp210x_read_vendor_block(serial, req_type, CP210X_READ_LATCH,
1494 &mask, len);
1495
1496 usb_autopm_put_interface(serial->interface);
1497
1498 if (result < 0)
1499 return result;
1500
1501 le16_to_cpus(&mask);
1502
1503 return !!(mask & BIT(gpio));
1504 }
1505
1506 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1507 {
1508 struct usb_serial *serial = gpiochip_get_data(gc);
1509 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1510 struct cp210x_gpio_write16 buf16;
1511 struct cp210x_gpio_write buf;
1512 u16 mask, state;
1513 u16 wIndex;
1514 int result;
1515
1516 if (value == 1)
1517 state = BIT(gpio);
1518 else
1519 state = 0;
1520
1521 mask = BIT(gpio);
1522
1523 result = usb_autopm_get_interface(serial->interface);
1524 if (result)
1525 goto out;
1526
1527 switch (priv->partnum) {
1528 case CP210X_PARTNUM_CP2105:
1529 buf.mask = (u8)mask;
1530 buf.state = (u8)state;
1531 result = cp210x_write_vendor_block(serial,
1532 REQTYPE_HOST_TO_INTERFACE,
1533 CP210X_WRITE_LATCH, &buf,
1534 sizeof(buf));
1535 break;
1536 case CP210X_PARTNUM_CP2108:
1537 buf16.mask = cpu_to_le16(mask);
1538 buf16.state = cpu_to_le16(state);
1539 result = cp210x_write_vendor_block(serial,
1540 REQTYPE_HOST_TO_INTERFACE,
1541 CP210X_WRITE_LATCH, &buf16,
1542 sizeof(buf16));
1543 break;
1544 default:
1545 wIndex = state << 8 | mask;
1546 result = usb_control_msg(serial->dev,
1547 usb_sndctrlpipe(serial->dev, 0),
1548 CP210X_VENDOR_SPECIFIC,
1549 REQTYPE_HOST_TO_DEVICE,
1550 CP210X_WRITE_LATCH,
1551 wIndex,
1552 NULL, 0, USB_CTRL_SET_TIMEOUT);
1553 break;
1554 }
1555
1556 usb_autopm_put_interface(serial->interface);
1557 out:
1558 if (result < 0) {
1559 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n",
1560 result);
1561 }
1562 }
1563
1564 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1565 {
1566 struct usb_serial *serial = gpiochip_get_data(gc);
1567 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1568
1569 return priv->gpio_input & BIT(gpio);
1570 }
1571
1572 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
1573 {
1574 struct usb_serial *serial = gpiochip_get_data(gc);
1575 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1576
1577 if (priv->partnum == CP210X_PARTNUM_CP2105) {
1578 /* hardware does not support an input mode */
1579 return -ENOTSUPP;
1580 }
1581
1582 /* push-pull pins cannot be changed to be inputs */
1583 if (priv->gpio_pushpull & BIT(gpio))
1584 return -EINVAL;
1585
1586 /* make sure to release pin if it is being driven low */
1587 cp210x_gpio_set(gc, gpio, 1);
1588
1589 priv->gpio_input |= BIT(gpio);
1590
1591 return 0;
1592 }
1593
1594 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1595 int value)
1596 {
1597 struct usb_serial *serial = gpiochip_get_data(gc);
1598 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1599
1600 priv->gpio_input &= ~BIT(gpio);
1601 cp210x_gpio_set(gc, gpio, value);
1602
1603 return 0;
1604 }
1605
1606 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
1607 unsigned long config)
1608 {
1609 struct usb_serial *serial = gpiochip_get_data(gc);
1610 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1611 enum pin_config_param param = pinconf_to_config_param(config);
1612
1613 /* Succeed only if in correct mode (this can't be set at runtime) */
1614 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) &&
1615 (priv->gpio_pushpull & BIT(gpio)))
1616 return 0;
1617
1618 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) &&
1619 !(priv->gpio_pushpull & BIT(gpio)))
1620 return 0;
1621
1622 return -ENOTSUPP;
1623 }
1624
1625 static int cp210x_gpio_init_valid_mask(struct gpio_chip *gc,
1626 unsigned long *valid_mask, unsigned int ngpios)
1627 {
1628 struct usb_serial *serial = gpiochip_get_data(gc);
1629 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1630 struct device *dev = &serial->interface->dev;
1631 unsigned long altfunc_mask = priv->gpio_altfunc;
1632
1633 bitmap_complement(valid_mask, &altfunc_mask, ngpios);
1634
1635 if (bitmap_empty(valid_mask, ngpios))
1636 dev_dbg(dev, "no pin configured for GPIO\n");
1637 else
1638 dev_dbg(dev, "GPIO.%*pbl configured for GPIO\n", ngpios,
1639 valid_mask);
1640 return 0;
1641 }
1642
1643 /*
1644 * This function is for configuring GPIO using shared pins, where other signals
1645 * are made unavailable by configuring the use of GPIO. This is believed to be
1646 * only applicable to the cp2105 at this point, the other devices supported by
1647 * this driver that provide GPIO do so in a way that does not impact other
1648 * signals and are thus expected to have very different initialisation.
1649 */
1650 static int cp2105_gpioconf_init(struct usb_serial *serial)
1651 {
1652 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1653 struct cp210x_pin_mode mode;
1654 struct cp210x_dual_port_config config;
1655 u8 intf_num = cp210x_interface_num(serial);
1656 u8 iface_config;
1657 int result;
1658
1659 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1660 CP210X_GET_DEVICEMODE, &mode,
1661 sizeof(mode));
1662 if (result < 0)
1663 return result;
1664
1665 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1666 CP210X_GET_PORTCONFIG, &config,
1667 sizeof(config));
1668 if (result < 0)
1669 return result;
1670
1671 /* 2 banks of GPIO - One for the pins taken from each serial port */
1672 if (intf_num == 0) {
1673 priv->gc.ngpio = 2;
1674
1675 if (mode.eci == CP210X_PIN_MODE_MODEM) {
1676 /* mark all GPIOs of this interface as reserved */
1677 priv->gpio_altfunc = 0xff;
1678 return 0;
1679 }
1680
1681 iface_config = config.eci_cfg;
1682 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1683 CP210X_ECI_GPIO_MODE_MASK) >>
1684 CP210X_ECI_GPIO_MODE_OFFSET);
1685 } else if (intf_num == 1) {
1686 priv->gc.ngpio = 3;
1687
1688 if (mode.sci == CP210X_PIN_MODE_MODEM) {
1689 /* mark all GPIOs of this interface as reserved */
1690 priv->gpio_altfunc = 0xff;
1691 return 0;
1692 }
1693
1694 iface_config = config.sci_cfg;
1695 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1696 CP210X_SCI_GPIO_MODE_MASK) >>
1697 CP210X_SCI_GPIO_MODE_OFFSET);
1698 } else {
1699 return -ENODEV;
1700 }
1701
1702 /* mark all pins which are not in GPIO mode */
1703 if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */
1704 priv->gpio_altfunc |= BIT(0);
1705 if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */
1706 CP2105_GPIO1_RS485_MODE))
1707 priv->gpio_altfunc |= BIT(1);
1708
1709 /* driver implementation for CP2105 only supports outputs */
1710 priv->gpio_input = 0;
1711
1712 return 0;
1713 }
1714
1715 static int cp2104_gpioconf_init(struct usb_serial *serial)
1716 {
1717 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1718 struct cp210x_single_port_config config;
1719 u8 iface_config;
1720 u8 gpio_latch;
1721 int result;
1722 u8 i;
1723
1724 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1725 CP210X_GET_PORTCONFIG, &config,
1726 sizeof(config));
1727 if (result < 0)
1728 return result;
1729
1730 priv->gc.ngpio = 4;
1731
1732 iface_config = config.device_cfg;
1733 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1734 CP210X_GPIO_MODE_MASK) >>
1735 CP210X_GPIO_MODE_OFFSET);
1736 gpio_latch = (u8)((le16_to_cpu(config.reset_state) &
1737 CP210X_GPIO_MODE_MASK) >>
1738 CP210X_GPIO_MODE_OFFSET);
1739
1740 /* mark all pins which are not in GPIO mode */
1741 if (iface_config & CP2104_GPIO0_TXLED_MODE) /* GPIO 0 */
1742 priv->gpio_altfunc |= BIT(0);
1743 if (iface_config & CP2104_GPIO1_RXLED_MODE) /* GPIO 1 */
1744 priv->gpio_altfunc |= BIT(1);
1745 if (iface_config & CP2104_GPIO2_RS485_MODE) /* GPIO 2 */
1746 priv->gpio_altfunc |= BIT(2);
1747
1748 /*
1749 * Like CP2102N, CP2104 has also no strict input and output pin
1750 * modes.
1751 * Do the same input mode emulation as CP2102N.
1752 */
1753 for (i = 0; i < priv->gc.ngpio; ++i) {
1754 /*
1755 * Set direction to "input" iff pin is open-drain and reset
1756 * value is 1.
1757 */
1758 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1759 priv->gpio_input |= BIT(i);
1760 }
1761
1762 return 0;
1763 }
1764
1765 static int cp2108_gpio_init(struct usb_serial *serial)
1766 {
1767 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1768 struct cp210x_quad_port_config config;
1769 u16 gpio_latch;
1770 int result;
1771 u8 i;
1772
1773 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1774 CP210X_GET_PORTCONFIG, &config,
1775 sizeof(config));
1776 if (result < 0)
1777 return result;
1778
1779 priv->gc.ngpio = 16;
1780 priv->gpio_pushpull = le16_to_cpu(config.reset_state.gpio_mode_pb1);
1781 gpio_latch = le16_to_cpu(config.reset_state.gpio_latch_pb1);
1782
1783 /*
1784 * Mark all pins which are not in GPIO mode.
1785 *
1786 * Refer to table 9.1 "GPIO Mode alternate Functions" in the datasheet:
1787 * https://www.silabs.com/documents/public/data-sheets/cp2108-datasheet.pdf
1788 *
1789 * Alternate functions of GPIO0 to GPIO3 are determine by enhancedfxn_ifc[0]
1790 * and the similarly for the other pins; enhancedfxn_ifc[1]: GPIO4 to GPIO7,
1791 * enhancedfxn_ifc[2]: GPIO8 to GPIO11, enhancedfxn_ifc[3]: GPIO12 to GPIO15.
1792 */
1793 for (i = 0; i < 4; i++) {
1794 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_TXLED)
1795 priv->gpio_altfunc |= BIT(i * 4);
1796 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RXLED)
1797 priv->gpio_altfunc |= BIT((i * 4) + 1);
1798 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RS485)
1799 priv->gpio_altfunc |= BIT((i * 4) + 2);
1800 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_CLOCK)
1801 priv->gpio_altfunc |= BIT((i * 4) + 3);
1802 }
1803
1804 /*
1805 * Like CP2102N, CP2108 has also no strict input and output pin
1806 * modes. Do the same input mode emulation as CP2102N.
1807 */
1808 for (i = 0; i < priv->gc.ngpio; ++i) {
1809 /*
1810 * Set direction to "input" iff pin is open-drain and reset
1811 * value is 1.
1812 */
1813 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1814 priv->gpio_input |= BIT(i);
1815 }
1816
1817 return 0;
1818 }
1819
1820 static int cp2102n_gpioconf_init(struct usb_serial *serial)
1821 {
1822 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1823 const u16 config_size = 0x02a6;
1824 u8 gpio_rst_latch;
1825 u8 config_version;
1826 u8 gpio_pushpull;
1827 u8 *config_buf;
1828 u8 gpio_latch;
1829 u8 gpio_ctrl;
1830 int result;
1831 u8 i;
1832
1833 /*
1834 * Retrieve device configuration from the device.
1835 * The array received contains all customization settings done at the
1836 * factory/manufacturer. Format of the array is documented at the
1837 * time of writing at:
1838 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa
1839 */
1840 config_buf = kmalloc(config_size, GFP_KERNEL);
1841 if (!config_buf)
1842 return -ENOMEM;
1843
1844 result = cp210x_read_vendor_block(serial,
1845 REQTYPE_DEVICE_TO_HOST,
1846 CP210X_READ_2NCONFIG,
1847 config_buf,
1848 config_size);
1849 if (result < 0) {
1850 kfree(config_buf);
1851 return result;
1852 }
1853
1854 config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX];
1855 gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX];
1856 gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX];
1857 gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX];
1858
1859 kfree(config_buf);
1860
1861 /* Make sure this is a config format we understand. */
1862 if (config_version != 0x01)
1863 return -ENOTSUPP;
1864
1865 priv->gc.ngpio = 4;
1866
1867 /*
1868 * Get default pin states after reset. Needed so we can determine
1869 * the direction of an open-drain pin.
1870 */
1871 gpio_latch = (gpio_rst_latch >> 3) & 0x0f;
1872
1873 /* 0 indicates open-drain mode, 1 is push-pull */
1874 priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f;
1875
1876 /* 0 indicates GPIO mode, 1 is alternate function */
1877 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN20) {
1878 /* QFN20 is special... */
1879 if (gpio_ctrl & CP2102N_QFN20_GPIO0_CLK_MODE) /* GPIO 0 */
1880 priv->gpio_altfunc |= BIT(0);
1881 if (gpio_ctrl & CP2102N_QFN20_GPIO1_RS485_MODE) /* GPIO 1 */
1882 priv->gpio_altfunc |= BIT(1);
1883 if (gpio_ctrl & CP2102N_QFN20_GPIO2_TXLED_MODE) /* GPIO 2 */
1884 priv->gpio_altfunc |= BIT(2);
1885 if (gpio_ctrl & CP2102N_QFN20_GPIO3_RXLED_MODE) /* GPIO 3 */
1886 priv->gpio_altfunc |= BIT(3);
1887 } else {
1888 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f;
1889 }
1890
1891 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) {
1892 /*
1893 * For the QFN28 package, GPIO4-6 are controlled by
1894 * the low three bits of the mode/latch fields.
1895 * Contrary to the document linked above, the bits for
1896 * the SUSPEND pins are elsewhere. No alternate
1897 * function is available for these pins.
1898 */
1899 priv->gc.ngpio = 7;
1900 gpio_latch |= (gpio_rst_latch & 7) << 4;
1901 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4;
1902 }
1903
1904 /*
1905 * The CP2102N does not strictly has input and output pin modes,
1906 * it only knows open-drain and push-pull modes which is set at
1907 * factory. An open-drain pin can function both as an
1908 * input or an output. We emulate input mode for open-drain pins
1909 * by making sure they are not driven low, and we do not allow
1910 * push-pull pins to be set as an input.
1911 */
1912 for (i = 0; i < priv->gc.ngpio; ++i) {
1913 /*
1914 * Set direction to "input" iff pin is open-drain and reset
1915 * value is 1.
1916 */
1917 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1918 priv->gpio_input |= BIT(i);
1919 }
1920
1921 return 0;
1922 }
1923
1924 static int cp210x_gpio_init(struct usb_serial *serial)
1925 {
1926 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1927 int result;
1928
1929 switch (priv->partnum) {
1930 case CP210X_PARTNUM_CP2104:
1931 result = cp2104_gpioconf_init(serial);
1932 break;
1933 case CP210X_PARTNUM_CP2105:
1934 result = cp2105_gpioconf_init(serial);
1935 break;
1936 case CP210X_PARTNUM_CP2108:
1937 /*
1938 * The GPIOs are not tied to any specific port so only register
1939 * once for interface 0.
1940 */
1941 if (cp210x_interface_num(serial) != 0)
1942 return 0;
1943 result = cp2108_gpio_init(serial);
1944 break;
1945 case CP210X_PARTNUM_CP2102N_QFN28:
1946 case CP210X_PARTNUM_CP2102N_QFN24:
1947 case CP210X_PARTNUM_CP2102N_QFN20:
1948 result = cp2102n_gpioconf_init(serial);
1949 break;
1950 default:
1951 return 0;
1952 }
1953
1954 if (result < 0)
1955 return result;
1956
1957 priv->gc.label = "cp210x";
1958 priv->gc.get_direction = cp210x_gpio_direction_get;
1959 priv->gc.direction_input = cp210x_gpio_direction_input;
1960 priv->gc.direction_output = cp210x_gpio_direction_output;
1961 priv->gc.get = cp210x_gpio_get;
1962 priv->gc.set = cp210x_gpio_set;
1963 priv->gc.set_config = cp210x_gpio_set_config;
1964 priv->gc.init_valid_mask = cp210x_gpio_init_valid_mask;
1965 priv->gc.owner = THIS_MODULE;
1966 priv->gc.parent = &serial->interface->dev;
1967 priv->gc.base = -1;
1968 priv->gc.can_sleep = true;
1969
1970 result = gpiochip_add_data(&priv->gc, serial);
1971 if (!result)
1972 priv->gpio_registered = true;
1973
1974 return result;
1975 }
1976
1977 static void cp210x_gpio_remove(struct usb_serial *serial)
1978 {
1979 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1980
1981 if (priv->gpio_registered) {
1982 gpiochip_remove(&priv->gc);
1983 priv->gpio_registered = false;
1984 }
1985 }
1986
1987 #else
1988
1989 static int cp210x_gpio_init(struct usb_serial *serial)
1990 {
1991 return 0;
1992 }
1993
1994 static void cp210x_gpio_remove(struct usb_serial *serial)
1995 {
1996 /* Nothing to do */
1997 }
1998
1999 #endif
2000
2001 static int cp210x_port_probe(struct usb_serial_port *port)
2002 {
2003 struct usb_serial *serial = port->serial;
2004 struct cp210x_port_private *port_priv;
2005
2006 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
2007 if (!port_priv)
2008 return -ENOMEM;
2009
2010 port_priv->bInterfaceNumber = cp210x_interface_num(serial);
2011 mutex_init(&port_priv->mutex);
2012
2013 usb_set_serial_port_data(port, port_priv);
2014
2015 return 0;
2016 }
2017
2018 static void cp210x_port_remove(struct usb_serial_port *port)
2019 {
2020 struct cp210x_port_private *port_priv;
2021
2022 port_priv = usb_get_serial_port_data(port);
2023 kfree(port_priv);
2024 }
2025
2026 static void cp210x_init_max_speed(struct usb_serial *serial)
2027 {
2028 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2029 bool use_actual_rate = false;
2030 speed_t min = 300;
2031 speed_t max;
2032
2033 switch (priv->partnum) {
2034 case CP210X_PARTNUM_CP2101:
2035 max = 921600;
2036 break;
2037 case CP210X_PARTNUM_CP2102:
2038 case CP210X_PARTNUM_CP2103:
2039 max = 1000000;
2040 break;
2041 case CP210X_PARTNUM_CP2104:
2042 use_actual_rate = true;
2043 max = 2000000;
2044 break;
2045 case CP210X_PARTNUM_CP2108:
2046 max = 2000000;
2047 break;
2048 case CP210X_PARTNUM_CP2105:
2049 if (cp210x_interface_num(serial) == 0) {
2050 use_actual_rate = true;
2051 max = 2000000; /* ECI */
2052 } else {
2053 min = 2400;
2054 max = 921600; /* SCI */
2055 }
2056 break;
2057 case CP210X_PARTNUM_CP2102N_QFN28:
2058 case CP210X_PARTNUM_CP2102N_QFN24:
2059 case CP210X_PARTNUM_CP2102N_QFN20:
2060 use_actual_rate = true;
2061 max = 3000000;
2062 break;
2063 default:
2064 max = 2000000;
2065 break;
2066 }
2067
2068 priv->min_speed = min;
2069 priv->max_speed = max;
2070 priv->use_actual_rate = use_actual_rate;
2071 }
2072
2073 static void cp2102_determine_quirks(struct usb_serial *serial)
2074 {
2075 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2076 u8 *buf;
2077 int ret;
2078
2079 buf = kmalloc(2, GFP_KERNEL);
2080 if (!buf)
2081 return;
2082 /*
2083 * Some (possibly counterfeit) CP2102 do not support event-insertion
2084 * mode and respond differently to malformed vendor requests.
2085 * Specifically, they return one instead of two bytes when sent a
2086 * two-byte part-number request.
2087 */
2088 ret = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2089 CP210X_VENDOR_SPECIFIC, REQTYPE_DEVICE_TO_HOST,
2090 CP210X_GET_PARTNUM, 0, buf, 2, USB_CTRL_GET_TIMEOUT);
2091 if (ret == 1) {
2092 dev_dbg(&serial->interface->dev,
2093 "device does not support event-insertion mode\n");
2094 priv->no_event_mode = true;
2095 }
2096
2097 kfree(buf);
2098 }
2099
2100 static int cp210x_get_fw_version(struct usb_serial *serial, u16 value)
2101 {
2102 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2103 u8 ver[3];
2104 int ret;
2105
2106 ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, value,
2107 ver, sizeof(ver));
2108 if (ret)
2109 return ret;
2110
2111 dev_dbg(&serial->interface->dev, "%s - %d.%d.%d\n", __func__,
2112 ver[0], ver[1], ver[2]);
2113
2114 priv->fw_version = ver[0] << 16 | ver[1] << 8 | ver[2];
2115
2116 return 0;
2117 }
2118
2119 static void cp210x_determine_type(struct usb_serial *serial)
2120 {
2121 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2122 int ret;
2123
2124 ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
2125 CP210X_GET_PARTNUM, &priv->partnum,
2126 sizeof(priv->partnum));
2127 if (ret < 0) {
2128 dev_warn(&serial->interface->dev,
2129 "querying part number failed\n");
2130 priv->partnum = CP210X_PARTNUM_UNKNOWN;
2131 return;
2132 }
2133
2134 dev_dbg(&serial->interface->dev, "partnum = 0x%02x\n", priv->partnum);
2135
2136 switch (priv->partnum) {
2137 case CP210X_PARTNUM_CP2102:
2138 cp2102_determine_quirks(serial);
2139 break;
2140 case CP210X_PARTNUM_CP2105:
2141 case CP210X_PARTNUM_CP2108:
2142 cp210x_get_fw_version(serial, CP210X_GET_FW_VER);
2143 break;
2144 case CP210X_PARTNUM_CP2102N_QFN28:
2145 case CP210X_PARTNUM_CP2102N_QFN24:
2146 case CP210X_PARTNUM_CP2102N_QFN20:
2147 ret = cp210x_get_fw_version(serial, CP210X_GET_FW_VER_2N);
2148 if (ret)
2149 break;
2150 if (priv->fw_version <= 0x10004)
2151 priv->no_flow_control = true;
2152 break;
2153 default:
2154 break;
2155 }
2156 }
2157
2158 static int cp210x_attach(struct usb_serial *serial)
2159 {
2160 int result;
2161 struct cp210x_serial_private *priv;
2162
2163 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2164 if (!priv)
2165 return -ENOMEM;
2166
2167 usb_set_serial_data(serial, priv);
2168
2169 cp210x_determine_type(serial);
2170 cp210x_init_max_speed(serial);
2171
2172 result = cp210x_gpio_init(serial);
2173 if (result < 0) {
2174 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n",
2175 result);
2176 }
2177
2178 return 0;
2179 }
2180
2181 static void cp210x_disconnect(struct usb_serial *serial)
2182 {
2183 cp210x_gpio_remove(serial);
2184 }
2185
2186 static void cp210x_release(struct usb_serial *serial)
2187 {
2188 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2189
2190 cp210x_gpio_remove(serial);
2191
2192 kfree(priv);
2193 }
2194
2195 module_usb_serial_driver(serial_drivers, id_table);
2196
2197 MODULE_DESCRIPTION(DRIVER_DESC);
2198 MODULE_LICENSE("GPL v2");
Kernel DRM miscellaneous fixes and cross-tree changes