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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/*
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#include <linux/gpio/driver.h>
27#include <linux/bitops.h>
28#include <linux/mutex.h>
29
30#define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
31
32/*
33 * Function Prototypes
34 */
35static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
36static void cp210x_close(struct usb_serial_port *);
37static void cp210x_get_termios(struct tty_struct *, struct usb_serial_port *);
38static void cp210x_get_termios_port(struct usb_serial_port *port,
39 tcflag_t *cflagp, unsigned int *baudp);
40static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *,
41 struct ktermios *);
42static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
43 struct ktermios*);
44static bool cp210x_tx_empty(struct usb_serial_port *port);
45static int cp210x_tiocmget(struct tty_struct *);
46static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
47static int cp210x_tiocmset_port(struct usb_serial_port *port,
48 unsigned int, unsigned int);
49static void cp210x_break_ctl(struct tty_struct *, int);
50static int cp210x_attach(struct usb_serial *);
51static void cp210x_disconnect(struct usb_serial *);
52static void cp210x_release(struct usb_serial *);
53static int cp210x_port_probe(struct usb_serial_port *);
54static int cp210x_port_remove(struct usb_serial_port *);
55static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
56
57static const struct usb_device_id id_table[] = {
58 { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */
59 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
60 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
61 { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
62 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
63 { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */
64 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
65 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
66 { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */
67 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
68 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
69 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
70 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
71 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
72 { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */
73 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
74 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
75 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
76 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
77 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
78 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
79 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
80 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
81 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
82 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
83 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
84 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
85 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
86 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
87 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
88 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
89 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
90 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
91 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
92 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
93 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
94 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
95 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
96 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
97 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
98 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
99 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
100 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
101 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
102 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
103 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
104 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
105 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
106 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
107 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
108 { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */
109 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
110 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
111 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
112 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
113 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
114 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
115 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
116 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */
117 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
118 { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */
119 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
120 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
121 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
122 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
123 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
124 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
125 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
126 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
127 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */
128 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
129 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
130 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
131 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
132 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
133 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
134 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
135 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
136 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
137 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
138 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
139 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
140 { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */
141 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
142 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
143 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
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(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
159 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
160 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
161 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
162 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
163 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
164 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
165 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
166 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
167 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
168 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
169 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
170 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
171 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
172 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
173 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
174 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
175 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
176 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
177 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
178 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
179 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
180 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
181 { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */
182 { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */
183 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
184 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
185 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
186 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
187 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
188 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
189 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
190 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
191 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
192 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
193 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
194 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
195 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
196 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
197 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
198 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
199 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
200 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
201 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
202 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
203 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
204 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
205 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
206 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
207 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
208 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
209 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
210 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
211 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
212 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
213 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
214 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
215 { } /* Terminating Entry */
216};
217
218MODULE_DEVICE_TABLE(usb, id_table);
219
220struct cp210x_serial_private {
221#ifdef CONFIG_GPIOLIB
222 struct gpio_chip gc;
223 u8 config;
224 u8 gpio_mode;
225 bool gpio_registered;
226#endif
227 u8 partnum;
228};
229
230struct cp210x_port_private {
231 __u8 bInterfaceNumber;
232 bool has_swapped_line_ctl;
233};
234
235static struct usb_serial_driver cp210x_device = {
236 .driver = {
237 .owner = THIS_MODULE,
238 .name = "cp210x",
239 },
240 .id_table = id_table,
241 .num_ports = 1,
242 .bulk_in_size = 256,
243 .bulk_out_size = 256,
244 .open = cp210x_open,
245 .close = cp210x_close,
246 .break_ctl = cp210x_break_ctl,
247 .set_termios = cp210x_set_termios,
248 .tx_empty = cp210x_tx_empty,
249 .tiocmget = cp210x_tiocmget,
250 .tiocmset = cp210x_tiocmset,
251 .attach = cp210x_attach,
252 .disconnect = cp210x_disconnect,
253 .release = cp210x_release,
254 .port_probe = cp210x_port_probe,
255 .port_remove = cp210x_port_remove,
256 .dtr_rts = cp210x_dtr_rts
257};
258
259static struct usb_serial_driver * const serial_drivers[] = {
260 &cp210x_device, NULL
261};
262
263/* Config request types */
264#define REQTYPE_HOST_TO_INTERFACE 0x41
265#define REQTYPE_INTERFACE_TO_HOST 0xc1
266#define REQTYPE_HOST_TO_DEVICE 0x40
267#define REQTYPE_DEVICE_TO_HOST 0xc0
268
269/* Config request codes */
270#define CP210X_IFC_ENABLE 0x00
271#define CP210X_SET_BAUDDIV 0x01
272#define CP210X_GET_BAUDDIV 0x02
273#define CP210X_SET_LINE_CTL 0x03
274#define CP210X_GET_LINE_CTL 0x04
275#define CP210X_SET_BREAK 0x05
276#define CP210X_IMM_CHAR 0x06
277#define CP210X_SET_MHS 0x07
278#define CP210X_GET_MDMSTS 0x08
279#define CP210X_SET_XON 0x09
280#define CP210X_SET_XOFF 0x0A
281#define CP210X_SET_EVENTMASK 0x0B
282#define CP210X_GET_EVENTMASK 0x0C
283#define CP210X_SET_CHAR 0x0D
284#define CP210X_GET_CHARS 0x0E
285#define CP210X_GET_PROPS 0x0F
286#define CP210X_GET_COMM_STATUS 0x10
287#define CP210X_RESET 0x11
288#define CP210X_PURGE 0x12
289#define CP210X_SET_FLOW 0x13
290#define CP210X_GET_FLOW 0x14
291#define CP210X_EMBED_EVENTS 0x15
292#define CP210X_GET_EVENTSTATE 0x16
293#define CP210X_SET_CHARS 0x19
294#define CP210X_GET_BAUDRATE 0x1D
295#define CP210X_SET_BAUDRATE 0x1E
296#define CP210X_VENDOR_SPECIFIC 0xFF
297
298/* CP210X_IFC_ENABLE */
299#define UART_ENABLE 0x0001
300#define UART_DISABLE 0x0000
301
302/* CP210X_(SET|GET)_BAUDDIV */
303#define BAUD_RATE_GEN_FREQ 0x384000
304
305/* CP210X_(SET|GET)_LINE_CTL */
306#define BITS_DATA_MASK 0X0f00
307#define BITS_DATA_5 0X0500
308#define BITS_DATA_6 0X0600
309#define BITS_DATA_7 0X0700
310#define BITS_DATA_8 0X0800
311#define BITS_DATA_9 0X0900
312
313#define BITS_PARITY_MASK 0x00f0
314#define BITS_PARITY_NONE 0x0000
315#define BITS_PARITY_ODD 0x0010
316#define BITS_PARITY_EVEN 0x0020
317#define BITS_PARITY_MARK 0x0030
318#define BITS_PARITY_SPACE 0x0040
319
320#define BITS_STOP_MASK 0x000f
321#define BITS_STOP_1 0x0000
322#define BITS_STOP_1_5 0x0001
323#define BITS_STOP_2 0x0002
324
325/* CP210X_SET_BREAK */
326#define BREAK_ON 0x0001
327#define BREAK_OFF 0x0000
328
329/* CP210X_(SET_MHS|GET_MDMSTS) */
330#define CONTROL_DTR 0x0001
331#define CONTROL_RTS 0x0002
332#define CONTROL_CTS 0x0010
333#define CONTROL_DSR 0x0020
334#define CONTROL_RING 0x0040
335#define CONTROL_DCD 0x0080
336#define CONTROL_WRITE_DTR 0x0100
337#define CONTROL_WRITE_RTS 0x0200
338
339/* CP210X_VENDOR_SPECIFIC values */
340#define CP210X_READ_LATCH 0x00C2
341#define CP210X_GET_PARTNUM 0x370B
342#define CP210X_GET_PORTCONFIG 0x370C
343#define CP210X_GET_DEVICEMODE 0x3711
344#define CP210X_WRITE_LATCH 0x37E1
345
346/* Part number definitions */
347#define CP210X_PARTNUM_CP2101 0x01
348#define CP210X_PARTNUM_CP2102 0x02
349#define CP210X_PARTNUM_CP2103 0x03
350#define CP210X_PARTNUM_CP2104 0x04
351#define CP210X_PARTNUM_CP2105 0x05
352#define CP210X_PARTNUM_CP2108 0x08
353
354/* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
355struct cp210x_comm_status {
356 __le32 ulErrors;
357 __le32 ulHoldReasons;
358 __le32 ulAmountInInQueue;
359 __le32 ulAmountInOutQueue;
360 u8 bEofReceived;
361 u8 bWaitForImmediate;
362 u8 bReserved;
363} __packed;
364
365/*
366 * CP210X_PURGE - 16 bits passed in wValue of USB request.
367 * SiLabs app note AN571 gives a strange description of the 4 bits:
368 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
369 * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
370 */
371#define PURGE_ALL 0x000f
372
373/* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
374struct cp210x_flow_ctl {
375 __le32 ulControlHandshake;
376 __le32 ulFlowReplace;
377 __le32 ulXonLimit;
378 __le32 ulXoffLimit;
379} __packed;
380
381/* cp210x_flow_ctl::ulControlHandshake */
382#define CP210X_SERIAL_DTR_MASK GENMASK(1, 0)
383#define CP210X_SERIAL_DTR_SHIFT(_mode) (_mode)
384#define CP210X_SERIAL_CTS_HANDSHAKE BIT(3)
385#define CP210X_SERIAL_DSR_HANDSHAKE BIT(4)
386#define CP210X_SERIAL_DCD_HANDSHAKE BIT(5)
387#define CP210X_SERIAL_DSR_SENSITIVITY BIT(6)
388
389/* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */
390#define CP210X_SERIAL_DTR_INACTIVE 0
391#define CP210X_SERIAL_DTR_ACTIVE 1
392#define CP210X_SERIAL_DTR_FLOW_CTL 2
393
394/* cp210x_flow_ctl::ulFlowReplace */
395#define CP210X_SERIAL_AUTO_TRANSMIT BIT(0)
396#define CP210X_SERIAL_AUTO_RECEIVE BIT(1)
397#define CP210X_SERIAL_ERROR_CHAR BIT(2)
398#define CP210X_SERIAL_NULL_STRIPPING BIT(3)
399#define CP210X_SERIAL_BREAK_CHAR BIT(4)
400#define CP210X_SERIAL_RTS_MASK GENMASK(7, 6)
401#define CP210X_SERIAL_RTS_SHIFT(_mode) (_mode << 6)
402#define CP210X_SERIAL_XOFF_CONTINUE BIT(31)
403
404/* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */
405#define CP210X_SERIAL_RTS_INACTIVE 0
406#define CP210X_SERIAL_RTS_ACTIVE 1
407#define CP210X_SERIAL_RTS_FLOW_CTL 2
408
409/* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
410struct cp210x_pin_mode {
411 u8 eci;
412 u8 sci;
413} __packed;
414
415#define CP210X_PIN_MODE_MODEM 0
416#define CP210X_PIN_MODE_GPIO BIT(0)
417
418/*
419 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes.
420 * Structure needs padding due to unused/unspecified bytes.
421 */
422struct cp210x_config {
423 __le16 gpio_mode;
424 u8 __pad0[2];
425 __le16 reset_state;
426 u8 __pad1[4];
427 __le16 suspend_state;
428 u8 sci_cfg;
429 u8 eci_cfg;
430 u8 device_cfg;
431} __packed;
432
433/* GPIO modes */
434#define CP210X_SCI_GPIO_MODE_OFFSET 9
435#define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9)
436
437#define CP210X_ECI_GPIO_MODE_OFFSET 2
438#define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2)
439
440/* CP2105 port configuration values */
441#define CP2105_GPIO0_TXLED_MODE BIT(0)
442#define CP2105_GPIO1_RXLED_MODE BIT(1)
443#define CP2105_GPIO1_RS485_MODE BIT(2)
444
445/* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */
446struct cp210x_gpio_write {
447 u8 mask;
448 u8 state;
449} __packed;
450
451/*
452 * Helper to get interface number when we only have struct usb_serial.
453 */
454static u8 cp210x_interface_num(struct usb_serial *serial)
455{
456 struct usb_host_interface *cur_altsetting;
457
458 cur_altsetting = serial->interface->cur_altsetting;
459
460 return cur_altsetting->desc.bInterfaceNumber;
461}
462
463/*
464 * Reads a variable-sized block of CP210X_ registers, identified by req.
465 * Returns data into buf in native USB byte order.
466 */
467static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
468 void *buf, int bufsize)
469{
470 struct usb_serial *serial = port->serial;
471 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
472 void *dmabuf;
473 int result;
474
475 dmabuf = kmalloc(bufsize, GFP_KERNEL);
476 if (!dmabuf) {
477 /*
478 * FIXME Some callers don't bother to check for error,
479 * at least give them consistent junk until they are fixed
480 */
481 memset(buf, 0, bufsize);
482 return -ENOMEM;
483 }
484
485 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
486 req, REQTYPE_INTERFACE_TO_HOST, 0,
487 port_priv->bInterfaceNumber, dmabuf, bufsize,
488 USB_CTRL_SET_TIMEOUT);
489 if (result == bufsize) {
490 memcpy(buf, dmabuf, bufsize);
491 result = 0;
492 } else {
493 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
494 req, bufsize, result);
495 if (result >= 0)
496 result = -EIO;
497
498 /*
499 * FIXME Some callers don't bother to check for error,
500 * at least give them consistent junk until they are fixed
501 */
502 memset(buf, 0, bufsize);
503 }
504
505 kfree(dmabuf);
506
507 return result;
508}
509
510/*
511 * Reads any 32-bit CP210X_ register identified by req.
512 */
513static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val)
514{
515 __le32 le32_val;
516 int err;
517
518 err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val));
519 if (err) {
520 /*
521 * FIXME Some callers don't bother to check for error,
522 * at least give them consistent junk until they are fixed
523 */
524 *val = 0;
525 return err;
526 }
527
528 *val = le32_to_cpu(le32_val);
529
530 return 0;
531}
532
533/*
534 * Reads any 16-bit CP210X_ register identified by req.
535 */
536static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val)
537{
538 __le16 le16_val;
539 int err;
540
541 err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val));
542 if (err)
543 return err;
544
545 *val = le16_to_cpu(le16_val);
546
547 return 0;
548}
549
550/*
551 * Reads any 8-bit CP210X_ register identified by req.
552 */
553static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
554{
555 return cp210x_read_reg_block(port, req, val, sizeof(*val));
556}
557
558/*
559 * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
560 * Returns data into buf in native USB byte order.
561 */
562static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
563 void *buf, int bufsize)
564{
565 void *dmabuf;
566 int result;
567
568 dmabuf = kmalloc(bufsize, GFP_KERNEL);
569 if (!dmabuf)
570 return -ENOMEM;
571
572 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
573 CP210X_VENDOR_SPECIFIC, type, val,
574 cp210x_interface_num(serial), dmabuf, bufsize,
575 USB_CTRL_GET_TIMEOUT);
576 if (result == bufsize) {
577 memcpy(buf, dmabuf, bufsize);
578 result = 0;
579 } else {
580 dev_err(&serial->interface->dev,
581 "failed to get vendor val 0x%04x size %d: %d\n", val,
582 bufsize, result);
583 if (result >= 0)
584 result = -EIO;
585 }
586
587 kfree(dmabuf);
588
589 return result;
590}
591
592/*
593 * Writes any 16-bit CP210X_ register (req) whose value is passed
594 * entirely in the wValue field of the USB request.
595 */
596static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
597{
598 struct usb_serial *serial = port->serial;
599 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
600 int result;
601
602 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
603 req, REQTYPE_HOST_TO_INTERFACE, val,
604 port_priv->bInterfaceNumber, NULL, 0,
605 USB_CTRL_SET_TIMEOUT);
606 if (result < 0) {
607 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
608 req, result);
609 }
610
611 return result;
612}
613
614/*
615 * Writes a variable-sized block of CP210X_ registers, identified by req.
616 * Data in buf must be in native USB byte order.
617 */
618static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
619 void *buf, int bufsize)
620{
621 struct usb_serial *serial = port->serial;
622 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
623 void *dmabuf;
624 int result;
625
626 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
627 if (!dmabuf)
628 return -ENOMEM;
629
630 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
631 req, REQTYPE_HOST_TO_INTERFACE, 0,
632 port_priv->bInterfaceNumber, dmabuf, bufsize,
633 USB_CTRL_SET_TIMEOUT);
634
635 kfree(dmabuf);
636
637 if (result == bufsize) {
638 result = 0;
639 } else {
640 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
641 req, bufsize, result);
642 if (result >= 0)
643 result = -EIO;
644 }
645
646 return result;
647}
648
649/*
650 * Writes any 32-bit CP210X_ register identified by req.
651 */
652static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
653{
654 __le32 le32_val;
655
656 le32_val = cpu_to_le32(val);
657
658 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
659}
660
661#ifdef CONFIG_GPIOLIB
662/*
663 * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
664 * Data in buf must be in native USB byte order.
665 */
666static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
667 u16 val, void *buf, int bufsize)
668{
669 void *dmabuf;
670 int result;
671
672 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
673 if (!dmabuf)
674 return -ENOMEM;
675
676 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
677 CP210X_VENDOR_SPECIFIC, type, val,
678 cp210x_interface_num(serial), dmabuf, bufsize,
679 USB_CTRL_SET_TIMEOUT);
680
681 kfree(dmabuf);
682
683 if (result == bufsize) {
684 result = 0;
685 } else {
686 dev_err(&serial->interface->dev,
687 "failed to set vendor val 0x%04x size %d: %d\n", val,
688 bufsize, result);
689 if (result >= 0)
690 result = -EIO;
691 }
692
693 return result;
694}
695#endif
696
697/*
698 * Detect CP2108 GET_LINE_CTL bug and activate workaround.
699 * Write a known good value 0x800, read it back.
700 * If it comes back swapped the bug is detected.
701 * Preserve the original register value.
702 */
703static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
704{
705 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
706 u16 line_ctl_save;
707 u16 line_ctl_test;
708 int err;
709
710 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save);
711 if (err)
712 return err;
713
714 err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800);
715 if (err)
716 return err;
717
718 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test);
719 if (err)
720 return err;
721
722 if (line_ctl_test == 8) {
723 port_priv->has_swapped_line_ctl = true;
724 line_ctl_save = swab16(line_ctl_save);
725 }
726
727 return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save);
728}
729
730/*
731 * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL)
732 * to workaround cp2108 bug and get correct value.
733 */
734static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl)
735{
736 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
737 int err;
738
739 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl);
740 if (err)
741 return err;
742
743 /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
744 if (port_priv->has_swapped_line_ctl)
745 *ctl = swab16(*ctl);
746
747 return 0;
748}
749
750/*
751 * cp210x_quantise_baudrate
752 * Quantises the baud rate as per AN205 Table 1
753 */
754static unsigned int cp210x_quantise_baudrate(unsigned int baud)
755{
756 if (baud <= 300)
757 baud = 300;
758 else if (baud <= 600) baud = 600;
759 else if (baud <= 1200) baud = 1200;
760 else if (baud <= 1800) baud = 1800;
761 else if (baud <= 2400) baud = 2400;
762 else if (baud <= 4000) baud = 4000;
763 else if (baud <= 4803) baud = 4800;
764 else if (baud <= 7207) baud = 7200;
765 else if (baud <= 9612) baud = 9600;
766 else if (baud <= 14428) baud = 14400;
767 else if (baud <= 16062) baud = 16000;
768 else if (baud <= 19250) baud = 19200;
769 else if (baud <= 28912) baud = 28800;
770 else if (baud <= 38601) baud = 38400;
771 else if (baud <= 51558) baud = 51200;
772 else if (baud <= 56280) baud = 56000;
773 else if (baud <= 58053) baud = 57600;
774 else if (baud <= 64111) baud = 64000;
775 else if (baud <= 77608) baud = 76800;
776 else if (baud <= 117028) baud = 115200;
777 else if (baud <= 129347) baud = 128000;
778 else if (baud <= 156868) baud = 153600;
779 else if (baud <= 237832) baud = 230400;
780 else if (baud <= 254234) baud = 250000;
781 else if (baud <= 273066) baud = 256000;
782 else if (baud <= 491520) baud = 460800;
783 else if (baud <= 567138) baud = 500000;
784 else if (baud <= 670254) baud = 576000;
785 else if (baud < 1000000)
786 baud = 921600;
787 else if (baud > 2000000)
788 baud = 2000000;
789 return baud;
790}
791
792static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
793{
794 int result;
795
796 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
797 if (result) {
798 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
799 return result;
800 }
801
802 /* Configure the termios structure */
803 cp210x_get_termios(tty, port);
804
805 /* The baud rate must be initialised on cp2104 */
806 if (tty)
807 cp210x_change_speed(tty, port, NULL);
808
809 return usb_serial_generic_open(tty, port);
810}
811
812static void cp210x_close(struct usb_serial_port *port)
813{
814 usb_serial_generic_close(port);
815
816 /* Clear both queues; cp2108 needs this to avoid an occasional hang */
817 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
818
819 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
820}
821
822/*
823 * Read how many bytes are waiting in the TX queue.
824 */
825static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
826 u32 *count)
827{
828 struct usb_serial *serial = port->serial;
829 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
830 struct cp210x_comm_status *sts;
831 int result;
832
833 sts = kmalloc(sizeof(*sts), GFP_KERNEL);
834 if (!sts)
835 return -ENOMEM;
836
837 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
838 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
839 0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
840 USB_CTRL_GET_TIMEOUT);
841 if (result == sizeof(*sts)) {
842 *count = le32_to_cpu(sts->ulAmountInOutQueue);
843 result = 0;
844 } else {
845 dev_err(&port->dev, "failed to get comm status: %d\n", result);
846 if (result >= 0)
847 result = -EIO;
848 }
849
850 kfree(sts);
851
852 return result;
853}
854
855static bool cp210x_tx_empty(struct usb_serial_port *port)
856{
857 int err;
858 u32 count;
859
860 err = cp210x_get_tx_queue_byte_count(port, &count);
861 if (err)
862 return true;
863
864 return !count;
865}
866
867/*
868 * cp210x_get_termios
869 * Reads the baud rate, data bits, parity, stop bits and flow control mode
870 * from the device, corrects any unsupported values, and configures the
871 * termios structure to reflect the state of the device
872 */
873static void cp210x_get_termios(struct tty_struct *tty,
874 struct usb_serial_port *port)
875{
876 unsigned int baud;
877
878 if (tty) {
879 cp210x_get_termios_port(tty->driver_data,
880 &tty->termios.c_cflag, &baud);
881 tty_encode_baud_rate(tty, baud, baud);
882 } else {
883 tcflag_t cflag;
884 cflag = 0;
885 cp210x_get_termios_port(port, &cflag, &baud);
886 }
887}
888
889/*
890 * cp210x_get_termios_port
891 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
892 */
893static void cp210x_get_termios_port(struct usb_serial_port *port,
894 tcflag_t *cflagp, unsigned int *baudp)
895{
896 struct device *dev = &port->dev;
897 tcflag_t cflag;
898 struct cp210x_flow_ctl flow_ctl;
899 u32 baud;
900 u16 bits;
901 u32 ctl_hs;
902
903 cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud);
904
905 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
906 *baudp = baud;
907
908 cflag = *cflagp;
909
910 cp210x_get_line_ctl(port, &bits);
911 cflag &= ~CSIZE;
912 switch (bits & BITS_DATA_MASK) {
913 case BITS_DATA_5:
914 dev_dbg(dev, "%s - data bits = 5\n", __func__);
915 cflag |= CS5;
916 break;
917 case BITS_DATA_6:
918 dev_dbg(dev, "%s - data bits = 6\n", __func__);
919 cflag |= CS6;
920 break;
921 case BITS_DATA_7:
922 dev_dbg(dev, "%s - data bits = 7\n", __func__);
923 cflag |= CS7;
924 break;
925 case BITS_DATA_8:
926 dev_dbg(dev, "%s - data bits = 8\n", __func__);
927 cflag |= CS8;
928 break;
929 case BITS_DATA_9:
930 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
931 cflag |= CS8;
932 bits &= ~BITS_DATA_MASK;
933 bits |= BITS_DATA_8;
934 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
935 break;
936 default:
937 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
938 cflag |= CS8;
939 bits &= ~BITS_DATA_MASK;
940 bits |= BITS_DATA_8;
941 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
942 break;
943 }
944
945 switch (bits & BITS_PARITY_MASK) {
946 case BITS_PARITY_NONE:
947 dev_dbg(dev, "%s - parity = NONE\n", __func__);
948 cflag &= ~PARENB;
949 break;
950 case BITS_PARITY_ODD:
951 dev_dbg(dev, "%s - parity = ODD\n", __func__);
952 cflag |= (PARENB|PARODD);
953 break;
954 case BITS_PARITY_EVEN:
955 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
956 cflag &= ~PARODD;
957 cflag |= PARENB;
958 break;
959 case BITS_PARITY_MARK:
960 dev_dbg(dev, "%s - parity = MARK\n", __func__);
961 cflag |= (PARENB|PARODD|CMSPAR);
962 break;
963 case BITS_PARITY_SPACE:
964 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
965 cflag &= ~PARODD;
966 cflag |= (PARENB|CMSPAR);
967 break;
968 default:
969 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
970 cflag &= ~PARENB;
971 bits &= ~BITS_PARITY_MASK;
972 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
973 break;
974 }
975
976 cflag &= ~CSTOPB;
977 switch (bits & BITS_STOP_MASK) {
978 case BITS_STOP_1:
979 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
980 break;
981 case BITS_STOP_1_5:
982 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
983 bits &= ~BITS_STOP_MASK;
984 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
985 break;
986 case BITS_STOP_2:
987 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
988 cflag |= CSTOPB;
989 break;
990 default:
991 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
992 bits &= ~BITS_STOP_MASK;
993 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
994 break;
995 }
996
997 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
998 sizeof(flow_ctl));
999 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1000 if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) {
1001 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1002 cflag |= CRTSCTS;
1003 } else {
1004 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1005 cflag &= ~CRTSCTS;
1006 }
1007
1008 *cflagp = cflag;
1009}
1010
1011/*
1012 * CP2101 supports the following baud rates:
1013 *
1014 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
1015 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
1016 *
1017 * CP2102 and CP2103 support the following additional rates:
1018 *
1019 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
1020 * 576000
1021 *
1022 * The device will map a requested rate to a supported one, but the result
1023 * of requests for rates greater than 1053257 is undefined (see AN205).
1024 *
1025 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
1026 * respectively, with an error less than 1%. The actual rates are determined
1027 * by
1028 *
1029 * div = round(freq / (2 x prescale x request))
1030 * actual = freq / (2 x prescale x div)
1031 *
1032 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1033 * or 1 otherwise.
1034 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1035 * otherwise.
1036 */
1037static void cp210x_change_speed(struct tty_struct *tty,
1038 struct usb_serial_port *port, struct ktermios *old_termios)
1039{
1040 u32 baud;
1041
1042 baud = tty->termios.c_ospeed;
1043
1044 /* This maps the requested rate to a rate valid on cp2102 or cp2103,
1045 * or to an arbitrary rate in [1M,2M].
1046 *
1047 * NOTE: B0 is not implemented.
1048 */
1049 baud = cp210x_quantise_baudrate(baud);
1050
1051 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1052 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1053 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1054 if (old_termios)
1055 baud = old_termios->c_ospeed;
1056 else
1057 baud = 9600;
1058 }
1059
1060 tty_encode_baud_rate(tty, baud, baud);
1061}
1062
1063static void cp210x_set_termios(struct tty_struct *tty,
1064 struct usb_serial_port *port, struct ktermios *old_termios)
1065{
1066 struct device *dev = &port->dev;
1067 unsigned int cflag, old_cflag;
1068 u16 bits;
1069
1070 cflag = tty->termios.c_cflag;
1071 old_cflag = old_termios->c_cflag;
1072
1073 if (tty->termios.c_ospeed != old_termios->c_ospeed)
1074 cp210x_change_speed(tty, port, old_termios);
1075
1076 /* If the number of data bits is to be updated */
1077 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
1078 cp210x_get_line_ctl(port, &bits);
1079 bits &= ~BITS_DATA_MASK;
1080 switch (cflag & CSIZE) {
1081 case CS5:
1082 bits |= BITS_DATA_5;
1083 dev_dbg(dev, "%s - data bits = 5\n", __func__);
1084 break;
1085 case CS6:
1086 bits |= BITS_DATA_6;
1087 dev_dbg(dev, "%s - data bits = 6\n", __func__);
1088 break;
1089 case CS7:
1090 bits |= BITS_DATA_7;
1091 dev_dbg(dev, "%s - data bits = 7\n", __func__);
1092 break;
1093 case CS8:
1094 default:
1095 bits |= BITS_DATA_8;
1096 dev_dbg(dev, "%s - data bits = 8\n", __func__);
1097 break;
1098 }
1099 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1100 dev_dbg(dev, "Number of data bits requested not supported by device\n");
1101 }
1102
1103 if ((cflag & (PARENB|PARODD|CMSPAR)) !=
1104 (old_cflag & (PARENB|PARODD|CMSPAR))) {
1105 cp210x_get_line_ctl(port, &bits);
1106 bits &= ~BITS_PARITY_MASK;
1107 if (cflag & PARENB) {
1108 if (cflag & CMSPAR) {
1109 if (cflag & PARODD) {
1110 bits |= BITS_PARITY_MARK;
1111 dev_dbg(dev, "%s - parity = MARK\n", __func__);
1112 } else {
1113 bits |= BITS_PARITY_SPACE;
1114 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
1115 }
1116 } else {
1117 if (cflag & PARODD) {
1118 bits |= BITS_PARITY_ODD;
1119 dev_dbg(dev, "%s - parity = ODD\n", __func__);
1120 } else {
1121 bits |= BITS_PARITY_EVEN;
1122 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
1123 }
1124 }
1125 }
1126 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1127 dev_dbg(dev, "Parity mode not supported by device\n");
1128 }
1129
1130 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
1131 cp210x_get_line_ctl(port, &bits);
1132 bits &= ~BITS_STOP_MASK;
1133 if (cflag & CSTOPB) {
1134 bits |= BITS_STOP_2;
1135 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1136 } else {
1137 bits |= BITS_STOP_1;
1138 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
1139 }
1140 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1141 dev_dbg(dev, "Number of stop bits requested not supported by device\n");
1142 }
1143
1144 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
1145 struct cp210x_flow_ctl flow_ctl;
1146 u32 ctl_hs;
1147 u32 flow_repl;
1148
1149 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1150 sizeof(flow_ctl));
1151 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1152 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1153 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1154 __func__, ctl_hs, flow_repl);
1155
1156 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1157 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1158 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1159 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1160 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE);
1161 if (cflag & CRTSCTS) {
1162 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1163
1164 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1165 flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1166 CP210X_SERIAL_RTS_FLOW_CTL);
1167 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1168 } else {
1169 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1170
1171 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1172 flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1173 CP210X_SERIAL_RTS_ACTIVE);
1174 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1175 }
1176
1177 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1178 __func__, ctl_hs, flow_repl);
1179 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1180 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1181 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1182 sizeof(flow_ctl));
1183 }
1184
1185}
1186
1187static int cp210x_tiocmset(struct tty_struct *tty,
1188 unsigned int set, unsigned int clear)
1189{
1190 struct usb_serial_port *port = tty->driver_data;
1191 return cp210x_tiocmset_port(port, set, clear);
1192}
1193
1194static int cp210x_tiocmset_port(struct usb_serial_port *port,
1195 unsigned int set, unsigned int clear)
1196{
1197 u16 control = 0;
1198
1199 if (set & TIOCM_RTS) {
1200 control |= CONTROL_RTS;
1201 control |= CONTROL_WRITE_RTS;
1202 }
1203 if (set & TIOCM_DTR) {
1204 control |= CONTROL_DTR;
1205 control |= CONTROL_WRITE_DTR;
1206 }
1207 if (clear & TIOCM_RTS) {
1208 control &= ~CONTROL_RTS;
1209 control |= CONTROL_WRITE_RTS;
1210 }
1211 if (clear & TIOCM_DTR) {
1212 control &= ~CONTROL_DTR;
1213 control |= CONTROL_WRITE_DTR;
1214 }
1215
1216 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
1217
1218 return cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1219}
1220
1221static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
1222{
1223 if (on)
1224 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
1225 else
1226 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
1227}
1228
1229static int cp210x_tiocmget(struct tty_struct *tty)
1230{
1231 struct usb_serial_port *port = tty->driver_data;
1232 u8 control;
1233 int result;
1234
1235 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1236 if (result)
1237 return result;
1238
1239 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1240 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1241 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1242 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1243 |((control & CONTROL_RING)? TIOCM_RI : 0)
1244 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
1245
1246 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
1247
1248 return result;
1249}
1250
1251static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1252{
1253 struct usb_serial_port *port = tty->driver_data;
1254 u16 state;
1255
1256 if (break_state == 0)
1257 state = BREAK_OFF;
1258 else
1259 state = BREAK_ON;
1260 dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1261 state == BREAK_OFF ? "off" : "on");
1262 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1263}
1264
1265#ifdef CONFIG_GPIOLIB
1266static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset)
1267{
1268 struct usb_serial *serial = gpiochip_get_data(gc);
1269 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1270
1271 switch (offset) {
1272 case 0:
1273 if (priv->config & CP2105_GPIO0_TXLED_MODE)
1274 return -ENODEV;
1275 break;
1276 case 1:
1277 if (priv->config & (CP2105_GPIO1_RXLED_MODE |
1278 CP2105_GPIO1_RS485_MODE))
1279 return -ENODEV;
1280 break;
1281 }
1282
1283 return 0;
1284}
1285
1286static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1287{
1288 struct usb_serial *serial = gpiochip_get_data(gc);
1289 int result;
1290 u8 buf;
1291
1292 result = cp210x_read_vendor_block(serial, REQTYPE_INTERFACE_TO_HOST,
1293 CP210X_READ_LATCH, &buf, sizeof(buf));
1294 if (result < 0)
1295 return result;
1296
1297 return !!(buf & BIT(gpio));
1298}
1299
1300static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1301{
1302 struct usb_serial *serial = gpiochip_get_data(gc);
1303 struct cp210x_gpio_write buf;
1304
1305 if (value == 1)
1306 buf.state = BIT(gpio);
1307 else
1308 buf.state = 0;
1309
1310 buf.mask = BIT(gpio);
1311
1312 cp210x_write_vendor_block(serial, REQTYPE_HOST_TO_INTERFACE,
1313 CP210X_WRITE_LATCH, &buf, sizeof(buf));
1314}
1315
1316static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1317{
1318 /* Hardware does not support an input mode */
1319 return 0;
1320}
1321
1322static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
1323{
1324 /* Hardware does not support an input mode */
1325 return -ENOTSUPP;
1326}
1327
1328static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1329 int value)
1330{
1331 return 0;
1332}
1333
1334static int cp210x_gpio_set_single_ended(struct gpio_chip *gc, unsigned int gpio,
1335 enum single_ended_mode mode)
1336{
1337 struct usb_serial *serial = gpiochip_get_data(gc);
1338 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1339
1340 /* Succeed only if in correct mode (this can't be set at runtime) */
1341 if ((mode == LINE_MODE_PUSH_PULL) && (priv->gpio_mode & BIT(gpio)))
1342 return 0;
1343
1344 if ((mode == LINE_MODE_OPEN_DRAIN) && !(priv->gpio_mode & BIT(gpio)))
1345 return 0;
1346
1347 return -ENOTSUPP;
1348}
1349
1350/*
1351 * This function is for configuring GPIO using shared pins, where other signals
1352 * are made unavailable by configuring the use of GPIO. This is believed to be
1353 * only applicable to the cp2105 at this point, the other devices supported by
1354 * this driver that provide GPIO do so in a way that does not impact other
1355 * signals and are thus expected to have very different initialisation.
1356 */
1357static int cp2105_shared_gpio_init(struct usb_serial *serial)
1358{
1359 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1360 struct cp210x_pin_mode mode;
1361 struct cp210x_config config;
1362 u8 intf_num = cp210x_interface_num(serial);
1363 int result;
1364
1365 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1366 CP210X_GET_DEVICEMODE, &mode,
1367 sizeof(mode));
1368 if (result < 0)
1369 return result;
1370
1371 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1372 CP210X_GET_PORTCONFIG, &config,
1373 sizeof(config));
1374 if (result < 0)
1375 return result;
1376
1377 /* 2 banks of GPIO - One for the pins taken from each serial port */
1378 if (intf_num == 0) {
1379 if (mode.eci == CP210X_PIN_MODE_MODEM)
1380 return 0;
1381
1382 priv->config = config.eci_cfg;
1383 priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) &
1384 CP210X_ECI_GPIO_MODE_MASK) >>
1385 CP210X_ECI_GPIO_MODE_OFFSET);
1386 priv->gc.ngpio = 2;
1387 } else if (intf_num == 1) {
1388 if (mode.sci == CP210X_PIN_MODE_MODEM)
1389 return 0;
1390
1391 priv->config = config.sci_cfg;
1392 priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) &
1393 CP210X_SCI_GPIO_MODE_MASK) >>
1394 CP210X_SCI_GPIO_MODE_OFFSET);
1395 priv->gc.ngpio = 3;
1396 } else {
1397 return -ENODEV;
1398 }
1399
1400 priv->gc.label = "cp210x";
1401 priv->gc.request = cp210x_gpio_request;
1402 priv->gc.get_direction = cp210x_gpio_direction_get;
1403 priv->gc.direction_input = cp210x_gpio_direction_input;
1404 priv->gc.direction_output = cp210x_gpio_direction_output;
1405 priv->gc.get = cp210x_gpio_get;
1406 priv->gc.set = cp210x_gpio_set;
1407 priv->gc.set_single_ended = cp210x_gpio_set_single_ended;
1408 priv->gc.owner = THIS_MODULE;
1409 priv->gc.parent = &serial->interface->dev;
1410 priv->gc.base = -1;
1411 priv->gc.can_sleep = true;
1412
1413 result = gpiochip_add_data(&priv->gc, serial);
1414 if (!result)
1415 priv->gpio_registered = true;
1416
1417 return result;
1418}
1419
1420static void cp210x_gpio_remove(struct usb_serial *serial)
1421{
1422 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1423
1424 if (priv->gpio_registered) {
1425 gpiochip_remove(&priv->gc);
1426 priv->gpio_registered = false;
1427 }
1428}
1429
1430#else
1431
1432static int cp2105_shared_gpio_init(struct usb_serial *serial)
1433{
1434 return 0;
1435}
1436
1437static void cp210x_gpio_remove(struct usb_serial *serial)
1438{
1439 /* Nothing to do */
1440}
1441
1442#endif
1443
1444static int cp210x_port_probe(struct usb_serial_port *port)
1445{
1446 struct usb_serial *serial = port->serial;
1447 struct cp210x_port_private *port_priv;
1448 int ret;
1449
1450 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1451 if (!port_priv)
1452 return -ENOMEM;
1453
1454 port_priv->bInterfaceNumber = cp210x_interface_num(serial);
1455
1456 usb_set_serial_port_data(port, port_priv);
1457
1458 ret = cp210x_detect_swapped_line_ctl(port);
1459 if (ret) {
1460 kfree(port_priv);
1461 return ret;
1462 }
1463
1464 return 0;
1465}
1466
1467static int cp210x_port_remove(struct usb_serial_port *port)
1468{
1469 struct cp210x_port_private *port_priv;
1470
1471 port_priv = usb_get_serial_port_data(port);
1472 kfree(port_priv);
1473
1474 return 0;
1475}
1476
1477static int cp210x_attach(struct usb_serial *serial)
1478{
1479 int result;
1480 struct cp210x_serial_private *priv;
1481
1482 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1483 if (!priv)
1484 return -ENOMEM;
1485
1486 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1487 CP210X_GET_PARTNUM, &priv->partnum,
1488 sizeof(priv->partnum));
1489 if (result < 0)
1490 goto err_free_priv;
1491
1492 usb_set_serial_data(serial, priv);
1493
1494 if (priv->partnum == CP210X_PARTNUM_CP2105) {
1495 result = cp2105_shared_gpio_init(serial);
1496 if (result < 0) {
1497 dev_err(&serial->interface->dev,
1498 "GPIO initialisation failed, continuing without GPIO support\n");
1499 }
1500 }
1501
1502 return 0;
1503err_free_priv:
1504 kfree(priv);
1505
1506 return result;
1507}
1508
1509static void cp210x_disconnect(struct usb_serial *serial)
1510{
1511 cp210x_gpio_remove(serial);
1512}
1513
1514static void cp210x_release(struct usb_serial *serial)
1515{
1516 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1517
1518 cp210x_gpio_remove(serial);
1519
1520 kfree(priv);
1521}
1522
1523module_usb_serial_driver(serial_drivers, id_table);
1524
1525MODULE_DESCRIPTION(DRIVER_DESC);
1526MODULE_LICENSE("GPL");