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1/*
2 * Silicon Laboratories CP210x USB to RS232 serial adaptor driver
3 *
4 * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License version
8 * 2 as published by the Free Software Foundation.
9 *
10 * Support to set flow control line levels using TIOCMGET and TIOCMSET
11 * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow
12 * control thanks to Munir Nassar nassarmu@real-time.com
13 *
14 */
15
16#include <linux/kernel.h>
17#include <linux/errno.h>
18#include <linux/slab.h>
19#include <linux/tty.h>
20#include <linux/tty_flip.h>
21#include <linux/module.h>
22#include <linux/moduleparam.h>
23#include <linux/usb.h>
24#include <linux/uaccess.h>
25#include <linux/usb/serial.h>
26
27#define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
28
29/*
30 * Function Prototypes
31 */
32static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
33static void cp210x_close(struct usb_serial_port *);
34static void cp210x_get_termios(struct tty_struct *, struct usb_serial_port *);
35static void cp210x_get_termios_port(struct usb_serial_port *port,
36 unsigned int *cflagp, unsigned int *baudp);
37static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *,
38 struct ktermios *);
39static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
40 struct ktermios*);
41static bool cp210x_tx_empty(struct usb_serial_port *port);
42static int cp210x_tiocmget(struct tty_struct *);
43static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
44static int cp210x_tiocmset_port(struct usb_serial_port *port,
45 unsigned int, unsigned int);
46static void cp210x_break_ctl(struct tty_struct *, int);
47static int cp210x_port_probe(struct usb_serial_port *);
48static int cp210x_port_remove(struct usb_serial_port *);
49static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
50
51static const struct usb_device_id id_table[] = {
52 { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */
53 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
54 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
55 { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
56 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
57 { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */
58 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
59 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
60 { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */
61 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
62 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
63 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
64 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
65 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
66 { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */
67 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
68 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
69 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
70 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
71 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
72 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
73 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
74 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
75 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
76 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
77 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
78 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
79 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
80 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
81 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
82 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
83 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
84 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
85 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
86 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
87 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
88 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
89 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
90 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
91 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
92 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
93 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
94 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
95 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
96 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
97 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
98 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
99 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
100 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
101 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
102 { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */
103 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
104 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
105 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
106 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
107 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
108 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
109 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
110 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */
111 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
112 { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */
113 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
114 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
115 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
116 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
117 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
118 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
119 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
120 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
121 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
122 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
123 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
124 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
125 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
126 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
127 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
128 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
129 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
130 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
131 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
132 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
133 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
134 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
135 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
136 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
137 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
138 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
139 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
140 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
141 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
142 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
143 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
144 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
145 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
146 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
147 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
148 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
149 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
150 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
151 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
152 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
153 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
154 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
155 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
156 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
157 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
158 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
159 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
160 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
161 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
162 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
163 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
164 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
165 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
166 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
167 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
168 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
169 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
170 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
171 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
172 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
173 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
174 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
175 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
176 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
177 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
178 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
179 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
180 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
181 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
182 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
183 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
184 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
185 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
186 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
187 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
188 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
189 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
190 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
191 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
192 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
193 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
194 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
195 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
196 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
197 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
198 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
199 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
200 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
201 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
202 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
203 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
204 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
205 { } /* Terminating Entry */
206};
207
208MODULE_DEVICE_TABLE(usb, id_table);
209
210struct cp210x_port_private {
211 __u8 bInterfaceNumber;
212 bool has_swapped_line_ctl;
213};
214
215static struct usb_serial_driver cp210x_device = {
216 .driver = {
217 .owner = THIS_MODULE,
218 .name = "cp210x",
219 },
220 .id_table = id_table,
221 .num_ports = 1,
222 .bulk_in_size = 256,
223 .bulk_out_size = 256,
224 .open = cp210x_open,
225 .close = cp210x_close,
226 .break_ctl = cp210x_break_ctl,
227 .set_termios = cp210x_set_termios,
228 .tx_empty = cp210x_tx_empty,
229 .tiocmget = cp210x_tiocmget,
230 .tiocmset = cp210x_tiocmset,
231 .port_probe = cp210x_port_probe,
232 .port_remove = cp210x_port_remove,
233 .dtr_rts = cp210x_dtr_rts
234};
235
236static struct usb_serial_driver * const serial_drivers[] = {
237 &cp210x_device, NULL
238};
239
240/* Config request types */
241#define REQTYPE_HOST_TO_INTERFACE 0x41
242#define REQTYPE_INTERFACE_TO_HOST 0xc1
243#define REQTYPE_HOST_TO_DEVICE 0x40
244#define REQTYPE_DEVICE_TO_HOST 0xc0
245
246/* Config request codes */
247#define CP210X_IFC_ENABLE 0x00
248#define CP210X_SET_BAUDDIV 0x01
249#define CP210X_GET_BAUDDIV 0x02
250#define CP210X_SET_LINE_CTL 0x03
251#define CP210X_GET_LINE_CTL 0x04
252#define CP210X_SET_BREAK 0x05
253#define CP210X_IMM_CHAR 0x06
254#define CP210X_SET_MHS 0x07
255#define CP210X_GET_MDMSTS 0x08
256#define CP210X_SET_XON 0x09
257#define CP210X_SET_XOFF 0x0A
258#define CP210X_SET_EVENTMASK 0x0B
259#define CP210X_GET_EVENTMASK 0x0C
260#define CP210X_SET_CHAR 0x0D
261#define CP210X_GET_CHARS 0x0E
262#define CP210X_GET_PROPS 0x0F
263#define CP210X_GET_COMM_STATUS 0x10
264#define CP210X_RESET 0x11
265#define CP210X_PURGE 0x12
266#define CP210X_SET_FLOW 0x13
267#define CP210X_GET_FLOW 0x14
268#define CP210X_EMBED_EVENTS 0x15
269#define CP210X_GET_EVENTSTATE 0x16
270#define CP210X_SET_CHARS 0x19
271#define CP210X_GET_BAUDRATE 0x1D
272#define CP210X_SET_BAUDRATE 0x1E
273
274/* CP210X_IFC_ENABLE */
275#define UART_ENABLE 0x0001
276#define UART_DISABLE 0x0000
277
278/* CP210X_(SET|GET)_BAUDDIV */
279#define BAUD_RATE_GEN_FREQ 0x384000
280
281/* CP210X_(SET|GET)_LINE_CTL */
282#define BITS_DATA_MASK 0X0f00
283#define BITS_DATA_5 0X0500
284#define BITS_DATA_6 0X0600
285#define BITS_DATA_7 0X0700
286#define BITS_DATA_8 0X0800
287#define BITS_DATA_9 0X0900
288
289#define BITS_PARITY_MASK 0x00f0
290#define BITS_PARITY_NONE 0x0000
291#define BITS_PARITY_ODD 0x0010
292#define BITS_PARITY_EVEN 0x0020
293#define BITS_PARITY_MARK 0x0030
294#define BITS_PARITY_SPACE 0x0040
295
296#define BITS_STOP_MASK 0x000f
297#define BITS_STOP_1 0x0000
298#define BITS_STOP_1_5 0x0001
299#define BITS_STOP_2 0x0002
300
301/* CP210X_SET_BREAK */
302#define BREAK_ON 0x0001
303#define BREAK_OFF 0x0000
304
305/* CP210X_(SET_MHS|GET_MDMSTS) */
306#define CONTROL_DTR 0x0001
307#define CONTROL_RTS 0x0002
308#define CONTROL_CTS 0x0010
309#define CONTROL_DSR 0x0020
310#define CONTROL_RING 0x0040
311#define CONTROL_DCD 0x0080
312#define CONTROL_WRITE_DTR 0x0100
313#define CONTROL_WRITE_RTS 0x0200
314
315/* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
316struct cp210x_comm_status {
317 __le32 ulErrors;
318 __le32 ulHoldReasons;
319 __le32 ulAmountInInQueue;
320 __le32 ulAmountInOutQueue;
321 u8 bEofReceived;
322 u8 bWaitForImmediate;
323 u8 bReserved;
324} __packed;
325
326/*
327 * CP210X_PURGE - 16 bits passed in wValue of USB request.
328 * SiLabs app note AN571 gives a strange description of the 4 bits:
329 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
330 * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
331 */
332#define PURGE_ALL 0x000f
333
334/*
335 * Reads a variable-sized block of CP210X_ registers, identified by req.
336 * Returns data into buf in native USB byte order.
337 */
338static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
339 void *buf, int bufsize)
340{
341 struct usb_serial *serial = port->serial;
342 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
343 void *dmabuf;
344 int result;
345
346 dmabuf = kmalloc(bufsize, GFP_KERNEL);
347 if (!dmabuf) {
348 /*
349 * FIXME Some callers don't bother to check for error,
350 * at least give them consistent junk until they are fixed
351 */
352 memset(buf, 0, bufsize);
353 return -ENOMEM;
354 }
355
356 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
357 req, REQTYPE_INTERFACE_TO_HOST, 0,
358 port_priv->bInterfaceNumber, dmabuf, bufsize,
359 USB_CTRL_SET_TIMEOUT);
360 if (result == bufsize) {
361 memcpy(buf, dmabuf, bufsize);
362 result = 0;
363 } else {
364 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
365 req, bufsize, result);
366 if (result >= 0)
367 result = -EPROTO;
368
369 /*
370 * FIXME Some callers don't bother to check for error,
371 * at least give them consistent junk until they are fixed
372 */
373 memset(buf, 0, bufsize);
374 }
375
376 kfree(dmabuf);
377
378 return result;
379}
380
381/*
382 * Reads any 32-bit CP210X_ register identified by req.
383 */
384static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val)
385{
386 __le32 le32_val;
387 int err;
388
389 err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val));
390 if (err) {
391 /*
392 * FIXME Some callers don't bother to check for error,
393 * at least give them consistent junk until they are fixed
394 */
395 *val = 0;
396 return err;
397 }
398
399 *val = le32_to_cpu(le32_val);
400
401 return 0;
402}
403
404/*
405 * Reads any 16-bit CP210X_ register identified by req.
406 */
407static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val)
408{
409 __le16 le16_val;
410 int err;
411
412 err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val));
413 if (err)
414 return err;
415
416 *val = le16_to_cpu(le16_val);
417
418 return 0;
419}
420
421/*
422 * Reads any 8-bit CP210X_ register identified by req.
423 */
424static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
425{
426 return cp210x_read_reg_block(port, req, val, sizeof(*val));
427}
428
429/*
430 * Writes any 16-bit CP210X_ register (req) whose value is passed
431 * entirely in the wValue field of the USB request.
432 */
433static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
434{
435 struct usb_serial *serial = port->serial;
436 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
437 int result;
438
439 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
440 req, REQTYPE_HOST_TO_INTERFACE, val,
441 port_priv->bInterfaceNumber, NULL, 0,
442 USB_CTRL_SET_TIMEOUT);
443 if (result < 0) {
444 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
445 req, result);
446 }
447
448 return result;
449}
450
451/*
452 * Writes a variable-sized block of CP210X_ registers, identified by req.
453 * Data in buf must be in native USB byte order.
454 */
455static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
456 void *buf, int bufsize)
457{
458 struct usb_serial *serial = port->serial;
459 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
460 void *dmabuf;
461 int result;
462
463 dmabuf = kmalloc(bufsize, GFP_KERNEL);
464 if (!dmabuf)
465 return -ENOMEM;
466
467 memcpy(dmabuf, buf, bufsize);
468
469 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
470 req, REQTYPE_HOST_TO_INTERFACE, 0,
471 port_priv->bInterfaceNumber, dmabuf, bufsize,
472 USB_CTRL_SET_TIMEOUT);
473
474 kfree(dmabuf);
475
476 if (result == bufsize) {
477 result = 0;
478 } else {
479 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
480 req, bufsize, result);
481 if (result >= 0)
482 result = -EPROTO;
483 }
484
485 return result;
486}
487
488/*
489 * Writes any 32-bit CP210X_ register identified by req.
490 */
491static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
492{
493 __le32 le32_val;
494
495 le32_val = cpu_to_le32(val);
496
497 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
498}
499
500/*
501 * Detect CP2108 GET_LINE_CTL bug and activate workaround.
502 * Write a known good value 0x800, read it back.
503 * If it comes back swapped the bug is detected.
504 * Preserve the original register value.
505 */
506static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
507{
508 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
509 u16 line_ctl_save;
510 u16 line_ctl_test;
511 int err;
512
513 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save);
514 if (err)
515 return err;
516
517 err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800);
518 if (err)
519 return err;
520
521 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test);
522 if (err)
523 return err;
524
525 if (line_ctl_test == 8) {
526 port_priv->has_swapped_line_ctl = true;
527 line_ctl_save = swab16(line_ctl_save);
528 }
529
530 return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save);
531}
532
533/*
534 * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL)
535 * to workaround cp2108 bug and get correct value.
536 */
537static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl)
538{
539 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
540 int err;
541
542 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl);
543 if (err)
544 return err;
545
546 /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
547 if (port_priv->has_swapped_line_ctl)
548 *ctl = swab16(*ctl);
549
550 return 0;
551}
552
553/*
554 * cp210x_quantise_baudrate
555 * Quantises the baud rate as per AN205 Table 1
556 */
557static unsigned int cp210x_quantise_baudrate(unsigned int baud)
558{
559 if (baud <= 300)
560 baud = 300;
561 else if (baud <= 600) baud = 600;
562 else if (baud <= 1200) baud = 1200;
563 else if (baud <= 1800) baud = 1800;
564 else if (baud <= 2400) baud = 2400;
565 else if (baud <= 4000) baud = 4000;
566 else if (baud <= 4803) baud = 4800;
567 else if (baud <= 7207) baud = 7200;
568 else if (baud <= 9612) baud = 9600;
569 else if (baud <= 14428) baud = 14400;
570 else if (baud <= 16062) baud = 16000;
571 else if (baud <= 19250) baud = 19200;
572 else if (baud <= 28912) baud = 28800;
573 else if (baud <= 38601) baud = 38400;
574 else if (baud <= 51558) baud = 51200;
575 else if (baud <= 56280) baud = 56000;
576 else if (baud <= 58053) baud = 57600;
577 else if (baud <= 64111) baud = 64000;
578 else if (baud <= 77608) baud = 76800;
579 else if (baud <= 117028) baud = 115200;
580 else if (baud <= 129347) baud = 128000;
581 else if (baud <= 156868) baud = 153600;
582 else if (baud <= 237832) baud = 230400;
583 else if (baud <= 254234) baud = 250000;
584 else if (baud <= 273066) baud = 256000;
585 else if (baud <= 491520) baud = 460800;
586 else if (baud <= 567138) baud = 500000;
587 else if (baud <= 670254) baud = 576000;
588 else if (baud < 1000000)
589 baud = 921600;
590 else if (baud > 2000000)
591 baud = 2000000;
592 return baud;
593}
594
595static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
596{
597 int result;
598
599 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
600 if (result) {
601 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
602 return result;
603 }
604
605 /* Configure the termios structure */
606 cp210x_get_termios(tty, port);
607
608 /* The baud rate must be initialised on cp2104 */
609 if (tty)
610 cp210x_change_speed(tty, port, NULL);
611
612 return usb_serial_generic_open(tty, port);
613}
614
615static void cp210x_close(struct usb_serial_port *port)
616{
617 usb_serial_generic_close(port);
618
619 /* Clear both queues; cp2108 needs this to avoid an occasional hang */
620 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
621
622 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
623}
624
625/*
626 * Read how many bytes are waiting in the TX queue.
627 */
628static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
629 u32 *count)
630{
631 struct usb_serial *serial = port->serial;
632 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
633 struct cp210x_comm_status *sts;
634 int result;
635
636 sts = kmalloc(sizeof(*sts), GFP_KERNEL);
637 if (!sts)
638 return -ENOMEM;
639
640 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
641 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
642 0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
643 USB_CTRL_GET_TIMEOUT);
644 if (result == sizeof(*sts)) {
645 *count = le32_to_cpu(sts->ulAmountInOutQueue);
646 result = 0;
647 } else {
648 dev_err(&port->dev, "failed to get comm status: %d\n", result);
649 if (result >= 0)
650 result = -EPROTO;
651 }
652
653 kfree(sts);
654
655 return result;
656}
657
658static bool cp210x_tx_empty(struct usb_serial_port *port)
659{
660 int err;
661 u32 count;
662
663 err = cp210x_get_tx_queue_byte_count(port, &count);
664 if (err)
665 return true;
666
667 return !count;
668}
669
670/*
671 * cp210x_get_termios
672 * Reads the baud rate, data bits, parity, stop bits and flow control mode
673 * from the device, corrects any unsupported values, and configures the
674 * termios structure to reflect the state of the device
675 */
676static void cp210x_get_termios(struct tty_struct *tty,
677 struct usb_serial_port *port)
678{
679 unsigned int baud;
680
681 if (tty) {
682 cp210x_get_termios_port(tty->driver_data,
683 &tty->termios.c_cflag, &baud);
684 tty_encode_baud_rate(tty, baud, baud);
685 } else {
686 unsigned int cflag;
687 cflag = 0;
688 cp210x_get_termios_port(port, &cflag, &baud);
689 }
690}
691
692/*
693 * cp210x_get_termios_port
694 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
695 */
696static void cp210x_get_termios_port(struct usb_serial_port *port,
697 unsigned int *cflagp, unsigned int *baudp)
698{
699 struct device *dev = &port->dev;
700 unsigned int cflag;
701 u8 modem_ctl[16];
702 u32 baud;
703 u16 bits;
704
705 cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud);
706
707 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
708 *baudp = baud;
709
710 cflag = *cflagp;
711
712 cp210x_get_line_ctl(port, &bits);
713 cflag &= ~CSIZE;
714 switch (bits & BITS_DATA_MASK) {
715 case BITS_DATA_5:
716 dev_dbg(dev, "%s - data bits = 5\n", __func__);
717 cflag |= CS5;
718 break;
719 case BITS_DATA_6:
720 dev_dbg(dev, "%s - data bits = 6\n", __func__);
721 cflag |= CS6;
722 break;
723 case BITS_DATA_7:
724 dev_dbg(dev, "%s - data bits = 7\n", __func__);
725 cflag |= CS7;
726 break;
727 case BITS_DATA_8:
728 dev_dbg(dev, "%s - data bits = 8\n", __func__);
729 cflag |= CS8;
730 break;
731 case BITS_DATA_9:
732 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
733 cflag |= CS8;
734 bits &= ~BITS_DATA_MASK;
735 bits |= BITS_DATA_8;
736 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
737 break;
738 default:
739 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
740 cflag |= CS8;
741 bits &= ~BITS_DATA_MASK;
742 bits |= BITS_DATA_8;
743 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
744 break;
745 }
746
747 switch (bits & BITS_PARITY_MASK) {
748 case BITS_PARITY_NONE:
749 dev_dbg(dev, "%s - parity = NONE\n", __func__);
750 cflag &= ~PARENB;
751 break;
752 case BITS_PARITY_ODD:
753 dev_dbg(dev, "%s - parity = ODD\n", __func__);
754 cflag |= (PARENB|PARODD);
755 break;
756 case BITS_PARITY_EVEN:
757 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
758 cflag &= ~PARODD;
759 cflag |= PARENB;
760 break;
761 case BITS_PARITY_MARK:
762 dev_dbg(dev, "%s - parity = MARK\n", __func__);
763 cflag |= (PARENB|PARODD|CMSPAR);
764 break;
765 case BITS_PARITY_SPACE:
766 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
767 cflag &= ~PARODD;
768 cflag |= (PARENB|CMSPAR);
769 break;
770 default:
771 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
772 cflag &= ~PARENB;
773 bits &= ~BITS_PARITY_MASK;
774 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
775 break;
776 }
777
778 cflag &= ~CSTOPB;
779 switch (bits & BITS_STOP_MASK) {
780 case BITS_STOP_1:
781 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
782 break;
783 case BITS_STOP_1_5:
784 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
785 bits &= ~BITS_STOP_MASK;
786 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
787 break;
788 case BITS_STOP_2:
789 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
790 cflag |= CSTOPB;
791 break;
792 default:
793 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
794 bits &= ~BITS_STOP_MASK;
795 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
796 break;
797 }
798
799 cp210x_read_reg_block(port, CP210X_GET_FLOW, modem_ctl,
800 sizeof(modem_ctl));
801 if (modem_ctl[0] & 0x08) {
802 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
803 cflag |= CRTSCTS;
804 } else {
805 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
806 cflag &= ~CRTSCTS;
807 }
808
809 *cflagp = cflag;
810}
811
812/*
813 * CP2101 supports the following baud rates:
814 *
815 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
816 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
817 *
818 * CP2102 and CP2103 support the following additional rates:
819 *
820 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
821 * 576000
822 *
823 * The device will map a requested rate to a supported one, but the result
824 * of requests for rates greater than 1053257 is undefined (see AN205).
825 *
826 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
827 * respectively, with an error less than 1%. The actual rates are determined
828 * by
829 *
830 * div = round(freq / (2 x prescale x request))
831 * actual = freq / (2 x prescale x div)
832 *
833 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
834 * or 1 otherwise.
835 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
836 * otherwise.
837 */
838static void cp210x_change_speed(struct tty_struct *tty,
839 struct usb_serial_port *port, struct ktermios *old_termios)
840{
841 u32 baud;
842
843 baud = tty->termios.c_ospeed;
844
845 /* This maps the requested rate to a rate valid on cp2102 or cp2103,
846 * or to an arbitrary rate in [1M,2M].
847 *
848 * NOTE: B0 is not implemented.
849 */
850 baud = cp210x_quantise_baudrate(baud);
851
852 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
853 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
854 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
855 if (old_termios)
856 baud = old_termios->c_ospeed;
857 else
858 baud = 9600;
859 }
860
861 tty_encode_baud_rate(tty, baud, baud);
862}
863
864static void cp210x_set_termios(struct tty_struct *tty,
865 struct usb_serial_port *port, struct ktermios *old_termios)
866{
867 struct device *dev = &port->dev;
868 unsigned int cflag, old_cflag;
869 u16 bits;
870 u8 modem_ctl[16];
871
872 cflag = tty->termios.c_cflag;
873 old_cflag = old_termios->c_cflag;
874
875 if (tty->termios.c_ospeed != old_termios->c_ospeed)
876 cp210x_change_speed(tty, port, old_termios);
877
878 /* If the number of data bits is to be updated */
879 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
880 cp210x_get_line_ctl(port, &bits);
881 bits &= ~BITS_DATA_MASK;
882 switch (cflag & CSIZE) {
883 case CS5:
884 bits |= BITS_DATA_5;
885 dev_dbg(dev, "%s - data bits = 5\n", __func__);
886 break;
887 case CS6:
888 bits |= BITS_DATA_6;
889 dev_dbg(dev, "%s - data bits = 6\n", __func__);
890 break;
891 case CS7:
892 bits |= BITS_DATA_7;
893 dev_dbg(dev, "%s - data bits = 7\n", __func__);
894 break;
895 case CS8:
896 bits |= BITS_DATA_8;
897 dev_dbg(dev, "%s - data bits = 8\n", __func__);
898 break;
899 /*case CS9:
900 bits |= BITS_DATA_9;
901 dev_dbg(dev, "%s - data bits = 9\n", __func__);
902 break;*/
903 default:
904 dev_dbg(dev, "cp210x driver does not support the number of bits requested, using 8 bit mode\n");
905 bits |= BITS_DATA_8;
906 break;
907 }
908 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
909 dev_dbg(dev, "Number of data bits requested not supported by device\n");
910 }
911
912 if ((cflag & (PARENB|PARODD|CMSPAR)) !=
913 (old_cflag & (PARENB|PARODD|CMSPAR))) {
914 cp210x_get_line_ctl(port, &bits);
915 bits &= ~BITS_PARITY_MASK;
916 if (cflag & PARENB) {
917 if (cflag & CMSPAR) {
918 if (cflag & PARODD) {
919 bits |= BITS_PARITY_MARK;
920 dev_dbg(dev, "%s - parity = MARK\n", __func__);
921 } else {
922 bits |= BITS_PARITY_SPACE;
923 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
924 }
925 } else {
926 if (cflag & PARODD) {
927 bits |= BITS_PARITY_ODD;
928 dev_dbg(dev, "%s - parity = ODD\n", __func__);
929 } else {
930 bits |= BITS_PARITY_EVEN;
931 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
932 }
933 }
934 }
935 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
936 dev_dbg(dev, "Parity mode not supported by device\n");
937 }
938
939 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
940 cp210x_get_line_ctl(port, &bits);
941 bits &= ~BITS_STOP_MASK;
942 if (cflag & CSTOPB) {
943 bits |= BITS_STOP_2;
944 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
945 } else {
946 bits |= BITS_STOP_1;
947 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
948 }
949 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
950 dev_dbg(dev, "Number of stop bits requested not supported by device\n");
951 }
952
953 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
954
955 /* Only bytes 0, 4 and 7 out of first 8 have functional bits */
956
957 cp210x_read_reg_block(port, CP210X_GET_FLOW, modem_ctl,
958 sizeof(modem_ctl));
959 dev_dbg(dev, "%s - read modem controls = %02x .. .. .. %02x .. .. %02x\n",
960 __func__, modem_ctl[0], modem_ctl[4], modem_ctl[7]);
961
962 if (cflag & CRTSCTS) {
963 modem_ctl[0] &= ~0x7B;
964 modem_ctl[0] |= 0x09;
965 modem_ctl[4] = 0x80;
966 /* FIXME - why clear reserved bits just read? */
967 modem_ctl[5] = 0;
968 modem_ctl[6] = 0;
969 modem_ctl[7] = 0;
970 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
971 } else {
972 modem_ctl[0] &= ~0x7B;
973 modem_ctl[0] |= 0x01;
974 /* FIXME - OR here instead of assignment looks wrong */
975 modem_ctl[4] |= 0x40;
976 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
977 }
978
979 dev_dbg(dev, "%s - write modem controls = %02x .. .. .. %02x .. .. %02x\n",
980 __func__, modem_ctl[0], modem_ctl[4], modem_ctl[7]);
981 cp210x_write_reg_block(port, CP210X_SET_FLOW, modem_ctl,
982 sizeof(modem_ctl));
983 }
984
985}
986
987static int cp210x_tiocmset(struct tty_struct *tty,
988 unsigned int set, unsigned int clear)
989{
990 struct usb_serial_port *port = tty->driver_data;
991 return cp210x_tiocmset_port(port, set, clear);
992}
993
994static int cp210x_tiocmset_port(struct usb_serial_port *port,
995 unsigned int set, unsigned int clear)
996{
997 u16 control = 0;
998
999 if (set & TIOCM_RTS) {
1000 control |= CONTROL_RTS;
1001 control |= CONTROL_WRITE_RTS;
1002 }
1003 if (set & TIOCM_DTR) {
1004 control |= CONTROL_DTR;
1005 control |= CONTROL_WRITE_DTR;
1006 }
1007 if (clear & TIOCM_RTS) {
1008 control &= ~CONTROL_RTS;
1009 control |= CONTROL_WRITE_RTS;
1010 }
1011 if (clear & TIOCM_DTR) {
1012 control &= ~CONTROL_DTR;
1013 control |= CONTROL_WRITE_DTR;
1014 }
1015
1016 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
1017
1018 return cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1019}
1020
1021static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
1022{
1023 if (on)
1024 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
1025 else
1026 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
1027}
1028
1029static int cp210x_tiocmget(struct tty_struct *tty)
1030{
1031 struct usb_serial_port *port = tty->driver_data;
1032 u8 control;
1033 int result;
1034
1035 cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1036
1037 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1038 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1039 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1040 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1041 |((control & CONTROL_RING)? TIOCM_RI : 0)
1042 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
1043
1044 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
1045
1046 return result;
1047}
1048
1049static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1050{
1051 struct usb_serial_port *port = tty->driver_data;
1052 u16 state;
1053
1054 if (break_state == 0)
1055 state = BREAK_OFF;
1056 else
1057 state = BREAK_ON;
1058 dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1059 state == BREAK_OFF ? "off" : "on");
1060 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1061}
1062
1063static int cp210x_port_probe(struct usb_serial_port *port)
1064{
1065 struct usb_serial *serial = port->serial;
1066 struct usb_host_interface *cur_altsetting;
1067 struct cp210x_port_private *port_priv;
1068 int ret;
1069
1070 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1071 if (!port_priv)
1072 return -ENOMEM;
1073
1074 cur_altsetting = serial->interface->cur_altsetting;
1075 port_priv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber;
1076
1077 usb_set_serial_port_data(port, port_priv);
1078
1079 ret = cp210x_detect_swapped_line_ctl(port);
1080 if (ret) {
1081 kfree(port_priv);
1082 return ret;
1083 }
1084
1085 return 0;
1086}
1087
1088static int cp210x_port_remove(struct usb_serial_port *port)
1089{
1090 struct cp210x_port_private *port_priv;
1091
1092 port_priv = usb_get_serial_port_data(port);
1093 kfree(port_priv);
1094
1095 return 0;
1096}
1097
1098module_usb_serial_driver(serial_drivers, id_table);
1099
1100MODULE_DESCRIPTION(DRIVER_DESC);
1101MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Silicon Laboratories CP210x USB to RS232 serial adaptor driver
4 *
5 * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
6 *
7 * Support to set flow control line levels using TIOCMGET and TIOCMSET
8 * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow
9 * control thanks to Munir Nassar nassarmu@real-time.com
10 *
11 */
12
13#include <linux/kernel.h>
14#include <linux/errno.h>
15#include <linux/slab.h>
16#include <linux/tty.h>
17#include <linux/tty_flip.h>
18#include <linux/module.h>
19#include <linux/moduleparam.h>
20#include <linux/usb.h>
21#include <linux/uaccess.h>
22#include <linux/usb/serial.h>
23#include <linux/gpio/driver.h>
24#include <linux/bitops.h>
25#include <linux/mutex.h>
26
27#define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
28
29/*
30 * Function Prototypes
31 */
32static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
33static void cp210x_close(struct usb_serial_port *);
34static void cp210x_get_termios(struct tty_struct *, struct usb_serial_port *);
35static void cp210x_get_termios_port(struct usb_serial_port *port,
36 tcflag_t *cflagp, unsigned int *baudp);
37static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *,
38 struct ktermios *);
39static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
40 struct ktermios*);
41static bool cp210x_tx_empty(struct usb_serial_port *port);
42static int cp210x_tiocmget(struct tty_struct *);
43static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
44static int cp210x_tiocmset_port(struct usb_serial_port *port,
45 unsigned int, unsigned int);
46static void cp210x_break_ctl(struct tty_struct *, int);
47static int cp210x_attach(struct usb_serial *);
48static void cp210x_disconnect(struct usb_serial *);
49static void cp210x_release(struct usb_serial *);
50static int cp210x_port_probe(struct usb_serial_port *);
51static int cp210x_port_remove(struct usb_serial_port *);
52static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
53
54static const struct usb_device_id id_table[] = {
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, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */
64 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
65 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
66 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
67 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
68 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
69 { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */
70 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
71 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
72 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
73 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
74 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
75 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
76 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
77 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
78 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
79 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
80 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
81 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
82 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
83 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
84 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
85 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
86 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
87 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
88 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
89 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
90 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
91 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
92 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
93 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
94 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
95 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
96 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
97 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
98 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
99 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
100 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
101 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
102 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
103 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
104 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
105 { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */
106 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
107 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
108 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
109 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
110 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
111 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
112 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
113 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */
114 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
115 { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */
116 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
117 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
118 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
119 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
120 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
121 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
122 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
123 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
124 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */
125 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
126 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
127 { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */
128 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
129 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
130 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
131 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
132 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
133 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
134 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
135 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
136 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
137 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
138 { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */
139 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
140 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
141 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
142 { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */
143 { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */
144 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
145 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
146 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
147 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
148 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
149 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
150 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
151 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
152 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
153 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
154 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
155 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
156 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
157 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
158 { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */
159 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
160 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
161 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
162 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
163 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
164 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
165 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
166 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
167 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
168 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
169 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
170 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
171 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
172 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
173 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
174 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
175 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
176 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
177 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
178 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
179 { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */
180 { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */
181 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
182 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
183 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
184 { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */
185 { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */
186 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
187 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
188 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
189 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
190 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
191 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
192 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
193 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
194 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
195 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
196 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
197 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
198 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
199 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
200 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
201 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
202 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
203 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
204 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
205 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
206 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
207 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
208 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
209 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
210 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
211 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
212 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
213 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
214 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
215 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
216 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
217 { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */
218 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
219 { } /* Terminating Entry */
220};
221
222MODULE_DEVICE_TABLE(usb, id_table);
223
224struct cp210x_serial_private {
225#ifdef CONFIG_GPIOLIB
226 struct gpio_chip gc;
227 u8 config;
228 u8 gpio_mode;
229 bool gpio_registered;
230#endif
231 u8 partnum;
232};
233
234struct cp210x_port_private {
235 __u8 bInterfaceNumber;
236 bool has_swapped_line_ctl;
237};
238
239static struct usb_serial_driver cp210x_device = {
240 .driver = {
241 .owner = THIS_MODULE,
242 .name = "cp210x",
243 },
244 .id_table = id_table,
245 .num_ports = 1,
246 .bulk_in_size = 256,
247 .bulk_out_size = 256,
248 .open = cp210x_open,
249 .close = cp210x_close,
250 .break_ctl = cp210x_break_ctl,
251 .set_termios = cp210x_set_termios,
252 .tx_empty = cp210x_tx_empty,
253 .tiocmget = cp210x_tiocmget,
254 .tiocmset = cp210x_tiocmset,
255 .attach = cp210x_attach,
256 .disconnect = cp210x_disconnect,
257 .release = cp210x_release,
258 .port_probe = cp210x_port_probe,
259 .port_remove = cp210x_port_remove,
260 .dtr_rts = cp210x_dtr_rts
261};
262
263static struct usb_serial_driver * const serial_drivers[] = {
264 &cp210x_device, NULL
265};
266
267/* Config request types */
268#define REQTYPE_HOST_TO_INTERFACE 0x41
269#define REQTYPE_INTERFACE_TO_HOST 0xc1
270#define REQTYPE_HOST_TO_DEVICE 0x40
271#define REQTYPE_DEVICE_TO_HOST 0xc0
272
273/* Config request codes */
274#define CP210X_IFC_ENABLE 0x00
275#define CP210X_SET_BAUDDIV 0x01
276#define CP210X_GET_BAUDDIV 0x02
277#define CP210X_SET_LINE_CTL 0x03
278#define CP210X_GET_LINE_CTL 0x04
279#define CP210X_SET_BREAK 0x05
280#define CP210X_IMM_CHAR 0x06
281#define CP210X_SET_MHS 0x07
282#define CP210X_GET_MDMSTS 0x08
283#define CP210X_SET_XON 0x09
284#define CP210X_SET_XOFF 0x0A
285#define CP210X_SET_EVENTMASK 0x0B
286#define CP210X_GET_EVENTMASK 0x0C
287#define CP210X_SET_CHAR 0x0D
288#define CP210X_GET_CHARS 0x0E
289#define CP210X_GET_PROPS 0x0F
290#define CP210X_GET_COMM_STATUS 0x10
291#define CP210X_RESET 0x11
292#define CP210X_PURGE 0x12
293#define CP210X_SET_FLOW 0x13
294#define CP210X_GET_FLOW 0x14
295#define CP210X_EMBED_EVENTS 0x15
296#define CP210X_GET_EVENTSTATE 0x16
297#define CP210X_SET_CHARS 0x19
298#define CP210X_GET_BAUDRATE 0x1D
299#define CP210X_SET_BAUDRATE 0x1E
300#define CP210X_VENDOR_SPECIFIC 0xFF
301
302/* CP210X_IFC_ENABLE */
303#define UART_ENABLE 0x0001
304#define UART_DISABLE 0x0000
305
306/* CP210X_(SET|GET)_BAUDDIV */
307#define BAUD_RATE_GEN_FREQ 0x384000
308
309/* CP210X_(SET|GET)_LINE_CTL */
310#define BITS_DATA_MASK 0X0f00
311#define BITS_DATA_5 0X0500
312#define BITS_DATA_6 0X0600
313#define BITS_DATA_7 0X0700
314#define BITS_DATA_8 0X0800
315#define BITS_DATA_9 0X0900
316
317#define BITS_PARITY_MASK 0x00f0
318#define BITS_PARITY_NONE 0x0000
319#define BITS_PARITY_ODD 0x0010
320#define BITS_PARITY_EVEN 0x0020
321#define BITS_PARITY_MARK 0x0030
322#define BITS_PARITY_SPACE 0x0040
323
324#define BITS_STOP_MASK 0x000f
325#define BITS_STOP_1 0x0000
326#define BITS_STOP_1_5 0x0001
327#define BITS_STOP_2 0x0002
328
329/* CP210X_SET_BREAK */
330#define BREAK_ON 0x0001
331#define BREAK_OFF 0x0000
332
333/* CP210X_(SET_MHS|GET_MDMSTS) */
334#define CONTROL_DTR 0x0001
335#define CONTROL_RTS 0x0002
336#define CONTROL_CTS 0x0010
337#define CONTROL_DSR 0x0020
338#define CONTROL_RING 0x0040
339#define CONTROL_DCD 0x0080
340#define CONTROL_WRITE_DTR 0x0100
341#define CONTROL_WRITE_RTS 0x0200
342
343/* CP210X_VENDOR_SPECIFIC values */
344#define CP210X_READ_LATCH 0x00C2
345#define CP210X_GET_PARTNUM 0x370B
346#define CP210X_GET_PORTCONFIG 0x370C
347#define CP210X_GET_DEVICEMODE 0x3711
348#define CP210X_WRITE_LATCH 0x37E1
349
350/* Part number definitions */
351#define CP210X_PARTNUM_CP2101 0x01
352#define CP210X_PARTNUM_CP2102 0x02
353#define CP210X_PARTNUM_CP2103 0x03
354#define CP210X_PARTNUM_CP2104 0x04
355#define CP210X_PARTNUM_CP2105 0x05
356#define CP210X_PARTNUM_CP2108 0x08
357#define CP210X_PARTNUM_UNKNOWN 0xFF
358
359/* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
360struct cp210x_comm_status {
361 __le32 ulErrors;
362 __le32 ulHoldReasons;
363 __le32 ulAmountInInQueue;
364 __le32 ulAmountInOutQueue;
365 u8 bEofReceived;
366 u8 bWaitForImmediate;
367 u8 bReserved;
368} __packed;
369
370/*
371 * CP210X_PURGE - 16 bits passed in wValue of USB request.
372 * SiLabs app note AN571 gives a strange description of the 4 bits:
373 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
374 * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
375 */
376#define PURGE_ALL 0x000f
377
378/* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
379struct cp210x_flow_ctl {
380 __le32 ulControlHandshake;
381 __le32 ulFlowReplace;
382 __le32 ulXonLimit;
383 __le32 ulXoffLimit;
384} __packed;
385
386/* cp210x_flow_ctl::ulControlHandshake */
387#define CP210X_SERIAL_DTR_MASK GENMASK(1, 0)
388#define CP210X_SERIAL_DTR_SHIFT(_mode) (_mode)
389#define CP210X_SERIAL_CTS_HANDSHAKE BIT(3)
390#define CP210X_SERIAL_DSR_HANDSHAKE BIT(4)
391#define CP210X_SERIAL_DCD_HANDSHAKE BIT(5)
392#define CP210X_SERIAL_DSR_SENSITIVITY BIT(6)
393
394/* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */
395#define CP210X_SERIAL_DTR_INACTIVE 0
396#define CP210X_SERIAL_DTR_ACTIVE 1
397#define CP210X_SERIAL_DTR_FLOW_CTL 2
398
399/* cp210x_flow_ctl::ulFlowReplace */
400#define CP210X_SERIAL_AUTO_TRANSMIT BIT(0)
401#define CP210X_SERIAL_AUTO_RECEIVE BIT(1)
402#define CP210X_SERIAL_ERROR_CHAR BIT(2)
403#define CP210X_SERIAL_NULL_STRIPPING BIT(3)
404#define CP210X_SERIAL_BREAK_CHAR BIT(4)
405#define CP210X_SERIAL_RTS_MASK GENMASK(7, 6)
406#define CP210X_SERIAL_RTS_SHIFT(_mode) (_mode << 6)
407#define CP210X_SERIAL_XOFF_CONTINUE BIT(31)
408
409/* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */
410#define CP210X_SERIAL_RTS_INACTIVE 0
411#define CP210X_SERIAL_RTS_ACTIVE 1
412#define CP210X_SERIAL_RTS_FLOW_CTL 2
413
414/* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
415struct cp210x_pin_mode {
416 u8 eci;
417 u8 sci;
418} __packed;
419
420#define CP210X_PIN_MODE_MODEM 0
421#define CP210X_PIN_MODE_GPIO BIT(0)
422
423/*
424 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes.
425 * Structure needs padding due to unused/unspecified bytes.
426 */
427struct cp210x_config {
428 __le16 gpio_mode;
429 u8 __pad0[2];
430 __le16 reset_state;
431 u8 __pad1[4];
432 __le16 suspend_state;
433 u8 sci_cfg;
434 u8 eci_cfg;
435 u8 device_cfg;
436} __packed;
437
438/* GPIO modes */
439#define CP210X_SCI_GPIO_MODE_OFFSET 9
440#define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9)
441
442#define CP210X_ECI_GPIO_MODE_OFFSET 2
443#define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2)
444
445/* CP2105 port configuration values */
446#define CP2105_GPIO0_TXLED_MODE BIT(0)
447#define CP2105_GPIO1_RXLED_MODE BIT(1)
448#define CP2105_GPIO1_RS485_MODE BIT(2)
449
450/* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */
451struct cp210x_gpio_write {
452 u8 mask;
453 u8 state;
454} __packed;
455
456/*
457 * Helper to get interface number when we only have struct usb_serial.
458 */
459static u8 cp210x_interface_num(struct usb_serial *serial)
460{
461 struct usb_host_interface *cur_altsetting;
462
463 cur_altsetting = serial->interface->cur_altsetting;
464
465 return cur_altsetting->desc.bInterfaceNumber;
466}
467
468/*
469 * Reads a variable-sized block of CP210X_ registers, identified by req.
470 * Returns data into buf in native USB byte order.
471 */
472static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
473 void *buf, int bufsize)
474{
475 struct usb_serial *serial = port->serial;
476 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
477 void *dmabuf;
478 int result;
479
480 dmabuf = kmalloc(bufsize, GFP_KERNEL);
481 if (!dmabuf) {
482 /*
483 * FIXME Some callers don't bother to check for error,
484 * at least give them consistent junk until they are fixed
485 */
486 memset(buf, 0, bufsize);
487 return -ENOMEM;
488 }
489
490 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
491 req, REQTYPE_INTERFACE_TO_HOST, 0,
492 port_priv->bInterfaceNumber, dmabuf, bufsize,
493 USB_CTRL_SET_TIMEOUT);
494 if (result == bufsize) {
495 memcpy(buf, dmabuf, bufsize);
496 result = 0;
497 } else {
498 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
499 req, bufsize, result);
500 if (result >= 0)
501 result = -EIO;
502
503 /*
504 * FIXME Some callers don't bother to check for error,
505 * at least give them consistent junk until they are fixed
506 */
507 memset(buf, 0, bufsize);
508 }
509
510 kfree(dmabuf);
511
512 return result;
513}
514
515/*
516 * Reads any 32-bit CP210X_ register identified by req.
517 */
518static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val)
519{
520 __le32 le32_val;
521 int err;
522
523 err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val));
524 if (err) {
525 /*
526 * FIXME Some callers don't bother to check for error,
527 * at least give them consistent junk until they are fixed
528 */
529 *val = 0;
530 return err;
531 }
532
533 *val = le32_to_cpu(le32_val);
534
535 return 0;
536}
537
538/*
539 * Reads any 16-bit CP210X_ register identified by req.
540 */
541static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val)
542{
543 __le16 le16_val;
544 int err;
545
546 err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val));
547 if (err)
548 return err;
549
550 *val = le16_to_cpu(le16_val);
551
552 return 0;
553}
554
555/*
556 * Reads any 8-bit CP210X_ register identified by req.
557 */
558static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
559{
560 return cp210x_read_reg_block(port, req, val, sizeof(*val));
561}
562
563/*
564 * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
565 * Returns data into buf in native USB byte order.
566 */
567static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
568 void *buf, int bufsize)
569{
570 void *dmabuf;
571 int result;
572
573 dmabuf = kmalloc(bufsize, GFP_KERNEL);
574 if (!dmabuf)
575 return -ENOMEM;
576
577 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
578 CP210X_VENDOR_SPECIFIC, type, val,
579 cp210x_interface_num(serial), dmabuf, bufsize,
580 USB_CTRL_GET_TIMEOUT);
581 if (result == bufsize) {
582 memcpy(buf, dmabuf, bufsize);
583 result = 0;
584 } else {
585 dev_err(&serial->interface->dev,
586 "failed to get vendor val 0x%04x size %d: %d\n", val,
587 bufsize, result);
588 if (result >= 0)
589 result = -EIO;
590 }
591
592 kfree(dmabuf);
593
594 return result;
595}
596
597/*
598 * Writes any 16-bit CP210X_ register (req) whose value is passed
599 * entirely in the wValue field of the USB request.
600 */
601static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
602{
603 struct usb_serial *serial = port->serial;
604 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
605 int result;
606
607 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
608 req, REQTYPE_HOST_TO_INTERFACE, val,
609 port_priv->bInterfaceNumber, NULL, 0,
610 USB_CTRL_SET_TIMEOUT);
611 if (result < 0) {
612 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
613 req, result);
614 }
615
616 return result;
617}
618
619/*
620 * Writes a variable-sized block of CP210X_ registers, identified by req.
621 * Data in buf must be in native USB byte order.
622 */
623static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
624 void *buf, int bufsize)
625{
626 struct usb_serial *serial = port->serial;
627 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
628 void *dmabuf;
629 int result;
630
631 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
632 if (!dmabuf)
633 return -ENOMEM;
634
635 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
636 req, REQTYPE_HOST_TO_INTERFACE, 0,
637 port_priv->bInterfaceNumber, dmabuf, bufsize,
638 USB_CTRL_SET_TIMEOUT);
639
640 kfree(dmabuf);
641
642 if (result == bufsize) {
643 result = 0;
644 } else {
645 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
646 req, bufsize, result);
647 if (result >= 0)
648 result = -EIO;
649 }
650
651 return result;
652}
653
654/*
655 * Writes any 32-bit CP210X_ register identified by req.
656 */
657static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
658{
659 __le32 le32_val;
660
661 le32_val = cpu_to_le32(val);
662
663 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
664}
665
666#ifdef CONFIG_GPIOLIB
667/*
668 * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
669 * Data in buf must be in native USB byte order.
670 */
671static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
672 u16 val, void *buf, int bufsize)
673{
674 void *dmabuf;
675 int result;
676
677 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
678 if (!dmabuf)
679 return -ENOMEM;
680
681 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
682 CP210X_VENDOR_SPECIFIC, type, val,
683 cp210x_interface_num(serial), dmabuf, bufsize,
684 USB_CTRL_SET_TIMEOUT);
685
686 kfree(dmabuf);
687
688 if (result == bufsize) {
689 result = 0;
690 } else {
691 dev_err(&serial->interface->dev,
692 "failed to set vendor val 0x%04x size %d: %d\n", val,
693 bufsize, result);
694 if (result >= 0)
695 result = -EIO;
696 }
697
698 return result;
699}
700#endif
701
702/*
703 * Detect CP2108 GET_LINE_CTL bug and activate workaround.
704 * Write a known good value 0x800, read it back.
705 * If it comes back swapped the bug is detected.
706 * Preserve the original register value.
707 */
708static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
709{
710 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
711 u16 line_ctl_save;
712 u16 line_ctl_test;
713 int err;
714
715 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save);
716 if (err)
717 return err;
718
719 err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800);
720 if (err)
721 return err;
722
723 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test);
724 if (err)
725 return err;
726
727 if (line_ctl_test == 8) {
728 port_priv->has_swapped_line_ctl = true;
729 line_ctl_save = swab16(line_ctl_save);
730 }
731
732 return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save);
733}
734
735/*
736 * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL)
737 * to workaround cp2108 bug and get correct value.
738 */
739static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl)
740{
741 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
742 int err;
743
744 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl);
745 if (err)
746 return err;
747
748 /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
749 if (port_priv->has_swapped_line_ctl)
750 *ctl = swab16(*ctl);
751
752 return 0;
753}
754
755/*
756 * cp210x_quantise_baudrate
757 * Quantises the baud rate as per AN205 Table 1
758 */
759static unsigned int cp210x_quantise_baudrate(unsigned int baud)
760{
761 if (baud <= 300)
762 baud = 300;
763 else if (baud <= 600) baud = 600;
764 else if (baud <= 1200) baud = 1200;
765 else if (baud <= 1800) baud = 1800;
766 else if (baud <= 2400) baud = 2400;
767 else if (baud <= 4000) baud = 4000;
768 else if (baud <= 4803) baud = 4800;
769 else if (baud <= 7207) baud = 7200;
770 else if (baud <= 9612) baud = 9600;
771 else if (baud <= 14428) baud = 14400;
772 else if (baud <= 16062) baud = 16000;
773 else if (baud <= 19250) baud = 19200;
774 else if (baud <= 28912) baud = 28800;
775 else if (baud <= 38601) baud = 38400;
776 else if (baud <= 51558) baud = 51200;
777 else if (baud <= 56280) baud = 56000;
778 else if (baud <= 58053) baud = 57600;
779 else if (baud <= 64111) baud = 64000;
780 else if (baud <= 77608) baud = 76800;
781 else if (baud <= 117028) baud = 115200;
782 else if (baud <= 129347) baud = 128000;
783 else if (baud <= 156868) baud = 153600;
784 else if (baud <= 237832) baud = 230400;
785 else if (baud <= 254234) baud = 250000;
786 else if (baud <= 273066) baud = 256000;
787 else if (baud <= 491520) baud = 460800;
788 else if (baud <= 567138) baud = 500000;
789 else if (baud <= 670254) baud = 576000;
790 else if (baud < 1000000)
791 baud = 921600;
792 else if (baud > 2000000)
793 baud = 2000000;
794 return baud;
795}
796
797static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
798{
799 int result;
800
801 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
802 if (result) {
803 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
804 return result;
805 }
806
807 /* Configure the termios structure */
808 cp210x_get_termios(tty, port);
809
810 /* The baud rate must be initialised on cp2104 */
811 if (tty)
812 cp210x_change_speed(tty, port, NULL);
813
814 return usb_serial_generic_open(tty, port);
815}
816
817static void cp210x_close(struct usb_serial_port *port)
818{
819 usb_serial_generic_close(port);
820
821 /* Clear both queues; cp2108 needs this to avoid an occasional hang */
822 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
823
824 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
825}
826
827/*
828 * Read how many bytes are waiting in the TX queue.
829 */
830static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
831 u32 *count)
832{
833 struct usb_serial *serial = port->serial;
834 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
835 struct cp210x_comm_status *sts;
836 int result;
837
838 sts = kmalloc(sizeof(*sts), GFP_KERNEL);
839 if (!sts)
840 return -ENOMEM;
841
842 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
843 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
844 0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
845 USB_CTRL_GET_TIMEOUT);
846 if (result == sizeof(*sts)) {
847 *count = le32_to_cpu(sts->ulAmountInOutQueue);
848 result = 0;
849 } else {
850 dev_err(&port->dev, "failed to get comm status: %d\n", result);
851 if (result >= 0)
852 result = -EIO;
853 }
854
855 kfree(sts);
856
857 return result;
858}
859
860static bool cp210x_tx_empty(struct usb_serial_port *port)
861{
862 int err;
863 u32 count;
864
865 err = cp210x_get_tx_queue_byte_count(port, &count);
866 if (err)
867 return true;
868
869 return !count;
870}
871
872/*
873 * cp210x_get_termios
874 * Reads the baud rate, data bits, parity, stop bits and flow control mode
875 * from the device, corrects any unsupported values, and configures the
876 * termios structure to reflect the state of the device
877 */
878static void cp210x_get_termios(struct tty_struct *tty,
879 struct usb_serial_port *port)
880{
881 unsigned int baud;
882
883 if (tty) {
884 cp210x_get_termios_port(tty->driver_data,
885 &tty->termios.c_cflag, &baud);
886 tty_encode_baud_rate(tty, baud, baud);
887 } else {
888 tcflag_t cflag;
889 cflag = 0;
890 cp210x_get_termios_port(port, &cflag, &baud);
891 }
892}
893
894/*
895 * cp210x_get_termios_port
896 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
897 */
898static void cp210x_get_termios_port(struct usb_serial_port *port,
899 tcflag_t *cflagp, unsigned int *baudp)
900{
901 struct device *dev = &port->dev;
902 tcflag_t cflag;
903 struct cp210x_flow_ctl flow_ctl;
904 u32 baud;
905 u16 bits;
906 u32 ctl_hs;
907
908 cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud);
909
910 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
911 *baudp = baud;
912
913 cflag = *cflagp;
914
915 cp210x_get_line_ctl(port, &bits);
916 cflag &= ~CSIZE;
917 switch (bits & BITS_DATA_MASK) {
918 case BITS_DATA_5:
919 dev_dbg(dev, "%s - data bits = 5\n", __func__);
920 cflag |= CS5;
921 break;
922 case BITS_DATA_6:
923 dev_dbg(dev, "%s - data bits = 6\n", __func__);
924 cflag |= CS6;
925 break;
926 case BITS_DATA_7:
927 dev_dbg(dev, "%s - data bits = 7\n", __func__);
928 cflag |= CS7;
929 break;
930 case BITS_DATA_8:
931 dev_dbg(dev, "%s - data bits = 8\n", __func__);
932 cflag |= CS8;
933 break;
934 case BITS_DATA_9:
935 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
936 cflag |= CS8;
937 bits &= ~BITS_DATA_MASK;
938 bits |= BITS_DATA_8;
939 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
940 break;
941 default:
942 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
943 cflag |= CS8;
944 bits &= ~BITS_DATA_MASK;
945 bits |= BITS_DATA_8;
946 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
947 break;
948 }
949
950 switch (bits & BITS_PARITY_MASK) {
951 case BITS_PARITY_NONE:
952 dev_dbg(dev, "%s - parity = NONE\n", __func__);
953 cflag &= ~PARENB;
954 break;
955 case BITS_PARITY_ODD:
956 dev_dbg(dev, "%s - parity = ODD\n", __func__);
957 cflag |= (PARENB|PARODD);
958 break;
959 case BITS_PARITY_EVEN:
960 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
961 cflag &= ~PARODD;
962 cflag |= PARENB;
963 break;
964 case BITS_PARITY_MARK:
965 dev_dbg(dev, "%s - parity = MARK\n", __func__);
966 cflag |= (PARENB|PARODD|CMSPAR);
967 break;
968 case BITS_PARITY_SPACE:
969 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
970 cflag &= ~PARODD;
971 cflag |= (PARENB|CMSPAR);
972 break;
973 default:
974 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
975 cflag &= ~PARENB;
976 bits &= ~BITS_PARITY_MASK;
977 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
978 break;
979 }
980
981 cflag &= ~CSTOPB;
982 switch (bits & BITS_STOP_MASK) {
983 case BITS_STOP_1:
984 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
985 break;
986 case BITS_STOP_1_5:
987 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
988 bits &= ~BITS_STOP_MASK;
989 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
990 break;
991 case BITS_STOP_2:
992 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
993 cflag |= CSTOPB;
994 break;
995 default:
996 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
997 bits &= ~BITS_STOP_MASK;
998 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
999 break;
1000 }
1001
1002 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1003 sizeof(flow_ctl));
1004 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1005 if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) {
1006 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1007 cflag |= CRTSCTS;
1008 } else {
1009 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1010 cflag &= ~CRTSCTS;
1011 }
1012
1013 *cflagp = cflag;
1014}
1015
1016/*
1017 * CP2101 supports the following baud rates:
1018 *
1019 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
1020 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
1021 *
1022 * CP2102 and CP2103 support the following additional rates:
1023 *
1024 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
1025 * 576000
1026 *
1027 * The device will map a requested rate to a supported one, but the result
1028 * of requests for rates greater than 1053257 is undefined (see AN205).
1029 *
1030 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
1031 * respectively, with an error less than 1%. The actual rates are determined
1032 * by
1033 *
1034 * div = round(freq / (2 x prescale x request))
1035 * actual = freq / (2 x prescale x div)
1036 *
1037 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1038 * or 1 otherwise.
1039 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1040 * otherwise.
1041 */
1042static void cp210x_change_speed(struct tty_struct *tty,
1043 struct usb_serial_port *port, struct ktermios *old_termios)
1044{
1045 u32 baud;
1046
1047 baud = tty->termios.c_ospeed;
1048
1049 /* This maps the requested rate to a rate valid on cp2102 or cp2103,
1050 * or to an arbitrary rate in [1M,2M].
1051 *
1052 * NOTE: B0 is not implemented.
1053 */
1054 baud = cp210x_quantise_baudrate(baud);
1055
1056 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1057 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1058 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1059 if (old_termios)
1060 baud = old_termios->c_ospeed;
1061 else
1062 baud = 9600;
1063 }
1064
1065 tty_encode_baud_rate(tty, baud, baud);
1066}
1067
1068static void cp210x_set_termios(struct tty_struct *tty,
1069 struct usb_serial_port *port, struct ktermios *old_termios)
1070{
1071 struct device *dev = &port->dev;
1072 unsigned int cflag, old_cflag;
1073 u16 bits;
1074
1075 cflag = tty->termios.c_cflag;
1076 old_cflag = old_termios->c_cflag;
1077
1078 if (tty->termios.c_ospeed != old_termios->c_ospeed)
1079 cp210x_change_speed(tty, port, old_termios);
1080
1081 /* If the number of data bits is to be updated */
1082 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
1083 cp210x_get_line_ctl(port, &bits);
1084 bits &= ~BITS_DATA_MASK;
1085 switch (cflag & CSIZE) {
1086 case CS5:
1087 bits |= BITS_DATA_5;
1088 dev_dbg(dev, "%s - data bits = 5\n", __func__);
1089 break;
1090 case CS6:
1091 bits |= BITS_DATA_6;
1092 dev_dbg(dev, "%s - data bits = 6\n", __func__);
1093 break;
1094 case CS7:
1095 bits |= BITS_DATA_7;
1096 dev_dbg(dev, "%s - data bits = 7\n", __func__);
1097 break;
1098 case CS8:
1099 default:
1100 bits |= BITS_DATA_8;
1101 dev_dbg(dev, "%s - data bits = 8\n", __func__);
1102 break;
1103 }
1104 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1105 dev_dbg(dev, "Number of data bits requested not supported by device\n");
1106 }
1107
1108 if ((cflag & (PARENB|PARODD|CMSPAR)) !=
1109 (old_cflag & (PARENB|PARODD|CMSPAR))) {
1110 cp210x_get_line_ctl(port, &bits);
1111 bits &= ~BITS_PARITY_MASK;
1112 if (cflag & PARENB) {
1113 if (cflag & CMSPAR) {
1114 if (cflag & PARODD) {
1115 bits |= BITS_PARITY_MARK;
1116 dev_dbg(dev, "%s - parity = MARK\n", __func__);
1117 } else {
1118 bits |= BITS_PARITY_SPACE;
1119 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
1120 }
1121 } else {
1122 if (cflag & PARODD) {
1123 bits |= BITS_PARITY_ODD;
1124 dev_dbg(dev, "%s - parity = ODD\n", __func__);
1125 } else {
1126 bits |= BITS_PARITY_EVEN;
1127 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
1128 }
1129 }
1130 }
1131 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1132 dev_dbg(dev, "Parity mode not supported by device\n");
1133 }
1134
1135 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
1136 cp210x_get_line_ctl(port, &bits);
1137 bits &= ~BITS_STOP_MASK;
1138 if (cflag & CSTOPB) {
1139 bits |= BITS_STOP_2;
1140 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1141 } else {
1142 bits |= BITS_STOP_1;
1143 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
1144 }
1145 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1146 dev_dbg(dev, "Number of stop bits requested not supported by device\n");
1147 }
1148
1149 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
1150 struct cp210x_flow_ctl flow_ctl;
1151 u32 ctl_hs;
1152 u32 flow_repl;
1153
1154 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1155 sizeof(flow_ctl));
1156 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1157 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1158 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1159 __func__, ctl_hs, flow_repl);
1160
1161 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1162 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1163 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1164 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1165 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE);
1166 if (cflag & CRTSCTS) {
1167 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1168
1169 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1170 flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1171 CP210X_SERIAL_RTS_FLOW_CTL);
1172 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1173 } else {
1174 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1175
1176 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1177 flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1178 CP210X_SERIAL_RTS_ACTIVE);
1179 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1180 }
1181
1182 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1183 __func__, ctl_hs, flow_repl);
1184 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1185 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1186 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1187 sizeof(flow_ctl));
1188 }
1189
1190}
1191
1192static int cp210x_tiocmset(struct tty_struct *tty,
1193 unsigned int set, unsigned int clear)
1194{
1195 struct usb_serial_port *port = tty->driver_data;
1196 return cp210x_tiocmset_port(port, set, clear);
1197}
1198
1199static int cp210x_tiocmset_port(struct usb_serial_port *port,
1200 unsigned int set, unsigned int clear)
1201{
1202 u16 control = 0;
1203
1204 if (set & TIOCM_RTS) {
1205 control |= CONTROL_RTS;
1206 control |= CONTROL_WRITE_RTS;
1207 }
1208 if (set & TIOCM_DTR) {
1209 control |= CONTROL_DTR;
1210 control |= CONTROL_WRITE_DTR;
1211 }
1212 if (clear & TIOCM_RTS) {
1213 control &= ~CONTROL_RTS;
1214 control |= CONTROL_WRITE_RTS;
1215 }
1216 if (clear & TIOCM_DTR) {
1217 control &= ~CONTROL_DTR;
1218 control |= CONTROL_WRITE_DTR;
1219 }
1220
1221 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
1222
1223 return cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1224}
1225
1226static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
1227{
1228 if (on)
1229 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
1230 else
1231 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
1232}
1233
1234static int cp210x_tiocmget(struct tty_struct *tty)
1235{
1236 struct usb_serial_port *port = tty->driver_data;
1237 u8 control;
1238 int result;
1239
1240 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1241 if (result)
1242 return result;
1243
1244 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1245 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1246 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1247 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1248 |((control & CONTROL_RING)? TIOCM_RI : 0)
1249 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
1250
1251 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
1252
1253 return result;
1254}
1255
1256static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1257{
1258 struct usb_serial_port *port = tty->driver_data;
1259 u16 state;
1260
1261 if (break_state == 0)
1262 state = BREAK_OFF;
1263 else
1264 state = BREAK_ON;
1265 dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1266 state == BREAK_OFF ? "off" : "on");
1267 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1268}
1269
1270#ifdef CONFIG_GPIOLIB
1271static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset)
1272{
1273 struct usb_serial *serial = gpiochip_get_data(gc);
1274 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1275
1276 switch (offset) {
1277 case 0:
1278 if (priv->config & CP2105_GPIO0_TXLED_MODE)
1279 return -ENODEV;
1280 break;
1281 case 1:
1282 if (priv->config & (CP2105_GPIO1_RXLED_MODE |
1283 CP2105_GPIO1_RS485_MODE))
1284 return -ENODEV;
1285 break;
1286 }
1287
1288 return 0;
1289}
1290
1291static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1292{
1293 struct usb_serial *serial = gpiochip_get_data(gc);
1294 int result;
1295 u8 buf;
1296
1297 result = cp210x_read_vendor_block(serial, REQTYPE_INTERFACE_TO_HOST,
1298 CP210X_READ_LATCH, &buf, sizeof(buf));
1299 if (result < 0)
1300 return result;
1301
1302 return !!(buf & BIT(gpio));
1303}
1304
1305static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1306{
1307 struct usb_serial *serial = gpiochip_get_data(gc);
1308 struct cp210x_gpio_write buf;
1309
1310 if (value == 1)
1311 buf.state = BIT(gpio);
1312 else
1313 buf.state = 0;
1314
1315 buf.mask = BIT(gpio);
1316
1317 cp210x_write_vendor_block(serial, REQTYPE_HOST_TO_INTERFACE,
1318 CP210X_WRITE_LATCH, &buf, sizeof(buf));
1319}
1320
1321static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1322{
1323 /* Hardware does not support an input mode */
1324 return 0;
1325}
1326
1327static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
1328{
1329 /* Hardware does not support an input mode */
1330 return -ENOTSUPP;
1331}
1332
1333static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1334 int value)
1335{
1336 return 0;
1337}
1338
1339static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
1340 unsigned long config)
1341{
1342 struct usb_serial *serial = gpiochip_get_data(gc);
1343 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1344 enum pin_config_param param = pinconf_to_config_param(config);
1345
1346 /* Succeed only if in correct mode (this can't be set at runtime) */
1347 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) &&
1348 (priv->gpio_mode & BIT(gpio)))
1349 return 0;
1350
1351 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) &&
1352 !(priv->gpio_mode & BIT(gpio)))
1353 return 0;
1354
1355 return -ENOTSUPP;
1356}
1357
1358/*
1359 * This function is for configuring GPIO using shared pins, where other signals
1360 * are made unavailable by configuring the use of GPIO. This is believed to be
1361 * only applicable to the cp2105 at this point, the other devices supported by
1362 * this driver that provide GPIO do so in a way that does not impact other
1363 * signals and are thus expected to have very different initialisation.
1364 */
1365static int cp2105_shared_gpio_init(struct usb_serial *serial)
1366{
1367 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1368 struct cp210x_pin_mode mode;
1369 struct cp210x_config config;
1370 u8 intf_num = cp210x_interface_num(serial);
1371 int result;
1372
1373 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1374 CP210X_GET_DEVICEMODE, &mode,
1375 sizeof(mode));
1376 if (result < 0)
1377 return result;
1378
1379 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1380 CP210X_GET_PORTCONFIG, &config,
1381 sizeof(config));
1382 if (result < 0)
1383 return result;
1384
1385 /* 2 banks of GPIO - One for the pins taken from each serial port */
1386 if (intf_num == 0) {
1387 if (mode.eci == CP210X_PIN_MODE_MODEM)
1388 return 0;
1389
1390 priv->config = config.eci_cfg;
1391 priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) &
1392 CP210X_ECI_GPIO_MODE_MASK) >>
1393 CP210X_ECI_GPIO_MODE_OFFSET);
1394 priv->gc.ngpio = 2;
1395 } else if (intf_num == 1) {
1396 if (mode.sci == CP210X_PIN_MODE_MODEM)
1397 return 0;
1398
1399 priv->config = config.sci_cfg;
1400 priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) &
1401 CP210X_SCI_GPIO_MODE_MASK) >>
1402 CP210X_SCI_GPIO_MODE_OFFSET);
1403 priv->gc.ngpio = 3;
1404 } else {
1405 return -ENODEV;
1406 }
1407
1408 priv->gc.label = "cp210x";
1409 priv->gc.request = cp210x_gpio_request;
1410 priv->gc.get_direction = cp210x_gpio_direction_get;
1411 priv->gc.direction_input = cp210x_gpio_direction_input;
1412 priv->gc.direction_output = cp210x_gpio_direction_output;
1413 priv->gc.get = cp210x_gpio_get;
1414 priv->gc.set = cp210x_gpio_set;
1415 priv->gc.set_config = cp210x_gpio_set_config;
1416 priv->gc.owner = THIS_MODULE;
1417 priv->gc.parent = &serial->interface->dev;
1418 priv->gc.base = -1;
1419 priv->gc.can_sleep = true;
1420
1421 result = gpiochip_add_data(&priv->gc, serial);
1422 if (!result)
1423 priv->gpio_registered = true;
1424
1425 return result;
1426}
1427
1428static void cp210x_gpio_remove(struct usb_serial *serial)
1429{
1430 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1431
1432 if (priv->gpio_registered) {
1433 gpiochip_remove(&priv->gc);
1434 priv->gpio_registered = false;
1435 }
1436}
1437
1438#else
1439
1440static int cp2105_shared_gpio_init(struct usb_serial *serial)
1441{
1442 return 0;
1443}
1444
1445static void cp210x_gpio_remove(struct usb_serial *serial)
1446{
1447 /* Nothing to do */
1448}
1449
1450#endif
1451
1452static int cp210x_port_probe(struct usb_serial_port *port)
1453{
1454 struct usb_serial *serial = port->serial;
1455 struct cp210x_port_private *port_priv;
1456 int ret;
1457
1458 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1459 if (!port_priv)
1460 return -ENOMEM;
1461
1462 port_priv->bInterfaceNumber = cp210x_interface_num(serial);
1463
1464 usb_set_serial_port_data(port, port_priv);
1465
1466 ret = cp210x_detect_swapped_line_ctl(port);
1467 if (ret) {
1468 kfree(port_priv);
1469 return ret;
1470 }
1471
1472 return 0;
1473}
1474
1475static int cp210x_port_remove(struct usb_serial_port *port)
1476{
1477 struct cp210x_port_private *port_priv;
1478
1479 port_priv = usb_get_serial_port_data(port);
1480 kfree(port_priv);
1481
1482 return 0;
1483}
1484
1485static int cp210x_attach(struct usb_serial *serial)
1486{
1487 int result;
1488 struct cp210x_serial_private *priv;
1489
1490 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1491 if (!priv)
1492 return -ENOMEM;
1493
1494 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1495 CP210X_GET_PARTNUM, &priv->partnum,
1496 sizeof(priv->partnum));
1497 if (result < 0) {
1498 dev_warn(&serial->interface->dev,
1499 "querying part number failed\n");
1500 priv->partnum = CP210X_PARTNUM_UNKNOWN;
1501 }
1502
1503 usb_set_serial_data(serial, priv);
1504
1505 if (priv->partnum == CP210X_PARTNUM_CP2105) {
1506 result = cp2105_shared_gpio_init(serial);
1507 if (result < 0) {
1508 dev_err(&serial->interface->dev,
1509 "GPIO initialisation failed, continuing without GPIO support\n");
1510 }
1511 }
1512
1513 return 0;
1514}
1515
1516static void cp210x_disconnect(struct usb_serial *serial)
1517{
1518 cp210x_gpio_remove(serial);
1519}
1520
1521static void cp210x_release(struct usb_serial *serial)
1522{
1523 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1524
1525 cp210x_gpio_remove(serial);
1526
1527 kfree(priv);
1528}
1529
1530module_usb_serial_driver(serial_drivers, id_table);
1531
1532MODULE_DESCRIPTION(DRIVER_DESC);
1533MODULE_LICENSE("GPL v2");