Version:  2.0.40 2.2.26 2.4.37 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5

Linux/drivers/usb/serial/cp210x.c

  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  */
 32 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
 33 static void cp210x_close(struct usb_serial_port *);
 34 static void cp210x_get_termios(struct tty_struct *, struct usb_serial_port *);
 35 static void cp210x_get_termios_port(struct usb_serial_port *port,
 36         unsigned int *cflagp, unsigned int *baudp);
 37 static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *,
 38                                                         struct ktermios *);
 39 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
 40                                                         struct ktermios*);
 41 static bool cp210x_tx_empty(struct usb_serial_port *port);
 42 static int cp210x_tiocmget(struct tty_struct *);
 43 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
 44 static int cp210x_tiocmset_port(struct usb_serial_port *port,
 45                 unsigned int, unsigned int);
 46 static void cp210x_break_ctl(struct tty_struct *, int);
 47 static int cp210x_port_probe(struct usb_serial_port *);
 48 static int cp210x_port_remove(struct usb_serial_port *);
 49 static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
 50 
 51 static 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, 0x82F9) }, /* Procyon AVS */
113         { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
114         { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
115         { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
116         { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
117         { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
118         { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
119         { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
120         { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
121         { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
122         { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
123         { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
124         { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
125         { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
126         { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
127         { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
128         { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
129         { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
130         { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
131         { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
132         { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
133         { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
134         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
135         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
136         { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
137         { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
138         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
139         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
140         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
141         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
142         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
143         { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
144         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
145         { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
146         { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
147         { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
148         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
149         { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
150         { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
151         { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
152         { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
153         { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
154         { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
155         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
156         { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
157         { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
158         { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
159         { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
160         { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
161         { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
162         { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
163         { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
164         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
165         { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
166         { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
167         { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
168         { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
169         { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
170         { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
171         { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
172         { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
173         { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
174         { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
175         { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
176         { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
177         { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
178         { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
179         { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
180         { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
181         { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
182         { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
183         { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
184         { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
185         { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
186         { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
187         { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
188         { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
189         { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
190         { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
191         { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
192         { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
193         { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
194         { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
195         { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
196         { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
197         { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
198         { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
199         { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
200         { } /* Terminating Entry */
201 };
202 
203 MODULE_DEVICE_TABLE(usb, id_table);
204 
205 struct cp210x_port_private {
206         __u8                    bInterfaceNumber;
207         bool                    has_swapped_line_ctl;
208 };
209 
210 static struct usb_serial_driver cp210x_device = {
211         .driver = {
212                 .owner =        THIS_MODULE,
213                 .name =         "cp210x",
214         },
215         .id_table               = id_table,
216         .num_ports              = 1,
217         .bulk_in_size           = 256,
218         .bulk_out_size          = 256,
219         .open                   = cp210x_open,
220         .close                  = cp210x_close,
221         .break_ctl              = cp210x_break_ctl,
222         .set_termios            = cp210x_set_termios,
223         .tx_empty               = cp210x_tx_empty,
224         .tiocmget               = cp210x_tiocmget,
225         .tiocmset               = cp210x_tiocmset,
226         .port_probe             = cp210x_port_probe,
227         .port_remove            = cp210x_port_remove,
228         .dtr_rts                = cp210x_dtr_rts
229 };
230 
231 static struct usb_serial_driver * const serial_drivers[] = {
232         &cp210x_device, NULL
233 };
234 
235 /* Config request types */
236 #define REQTYPE_HOST_TO_INTERFACE       0x41
237 #define REQTYPE_INTERFACE_TO_HOST       0xc1
238 #define REQTYPE_HOST_TO_DEVICE  0x40
239 #define REQTYPE_DEVICE_TO_HOST  0xc0
240 
241 /* Config request codes */
242 #define CP210X_IFC_ENABLE       0x00
243 #define CP210X_SET_BAUDDIV      0x01
244 #define CP210X_GET_BAUDDIV      0x02
245 #define CP210X_SET_LINE_CTL     0x03
246 #define CP210X_GET_LINE_CTL     0x04
247 #define CP210X_SET_BREAK        0x05
248 #define CP210X_IMM_CHAR         0x06
249 #define CP210X_SET_MHS          0x07
250 #define CP210X_GET_MDMSTS       0x08
251 #define CP210X_SET_XON          0x09
252 #define CP210X_SET_XOFF         0x0A
253 #define CP210X_SET_EVENTMASK    0x0B
254 #define CP210X_GET_EVENTMASK    0x0C
255 #define CP210X_SET_CHAR         0x0D
256 #define CP210X_GET_CHARS        0x0E
257 #define CP210X_GET_PROPS        0x0F
258 #define CP210X_GET_COMM_STATUS  0x10
259 #define CP210X_RESET            0x11
260 #define CP210X_PURGE            0x12
261 #define CP210X_SET_FLOW         0x13
262 #define CP210X_GET_FLOW         0x14
263 #define CP210X_EMBED_EVENTS     0x15
264 #define CP210X_GET_EVENTSTATE   0x16
265 #define CP210X_SET_CHARS        0x19
266 #define CP210X_GET_BAUDRATE     0x1D
267 #define CP210X_SET_BAUDRATE     0x1E
268 
269 /* CP210X_IFC_ENABLE */
270 #define UART_ENABLE             0x0001
271 #define UART_DISABLE            0x0000
272 
273 /* CP210X_(SET|GET)_BAUDDIV */
274 #define BAUD_RATE_GEN_FREQ      0x384000
275 
276 /* CP210X_(SET|GET)_LINE_CTL */
277 #define BITS_DATA_MASK          0X0f00
278 #define BITS_DATA_5             0X0500
279 #define BITS_DATA_6             0X0600
280 #define BITS_DATA_7             0X0700
281 #define BITS_DATA_8             0X0800
282 #define BITS_DATA_9             0X0900
283 
284 #define BITS_PARITY_MASK        0x00f0
285 #define BITS_PARITY_NONE        0x0000
286 #define BITS_PARITY_ODD         0x0010
287 #define BITS_PARITY_EVEN        0x0020
288 #define BITS_PARITY_MARK        0x0030
289 #define BITS_PARITY_SPACE       0x0040
290 
291 #define BITS_STOP_MASK          0x000f
292 #define BITS_STOP_1             0x0000
293 #define BITS_STOP_1_5           0x0001
294 #define BITS_STOP_2             0x0002
295 
296 /* CP210X_SET_BREAK */
297 #define BREAK_ON                0x0001
298 #define BREAK_OFF               0x0000
299 
300 /* CP210X_(SET_MHS|GET_MDMSTS) */
301 #define CONTROL_DTR             0x0001
302 #define CONTROL_RTS             0x0002
303 #define CONTROL_CTS             0x0010
304 #define CONTROL_DSR             0x0020
305 #define CONTROL_RING            0x0040
306 #define CONTROL_DCD             0x0080
307 #define CONTROL_WRITE_DTR       0x0100
308 #define CONTROL_WRITE_RTS       0x0200
309 
310 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
311 struct cp210x_comm_status {
312         __le32   ulErrors;
313         __le32   ulHoldReasons;
314         __le32   ulAmountInInQueue;
315         __le32   ulAmountInOutQueue;
316         u8       bEofReceived;
317         u8       bWaitForImmediate;
318         u8       bReserved;
319 } __packed;
320 
321 /*
322  * CP210X_PURGE - 16 bits passed in wValue of USB request.
323  * SiLabs app note AN571 gives a strange description of the 4 bits:
324  * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
325  * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
326  */
327 #define PURGE_ALL               0x000f
328 
329 /*
330  * cp210x_get_config
331  * Reads from the CP210x configuration registers
332  * 'size' is specified in bytes.
333  * 'data' is a pointer to a pre-allocated array of integers large
334  * enough to hold 'size' bytes (with 4 bytes to each integer)
335  */
336 static int cp210x_get_config(struct usb_serial_port *port, u8 request,
337                 unsigned int *data, int size)
338 {
339         struct usb_serial *serial = port->serial;
340         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
341         __le32 *buf;
342         int result, i, length;
343 
344         /* Number of integers required to contain the array */
345         length = (((size - 1) | 3) + 1) / 4;
346 
347         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
348         if (!buf)
349                 return -ENOMEM;
350 
351         /* Issue the request, attempting to read 'size' bytes */
352         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
353                                 request, REQTYPE_INTERFACE_TO_HOST, 0x0000,
354                                 port_priv->bInterfaceNumber, buf, size,
355                                 USB_CTRL_GET_TIMEOUT);
356 
357         /* Convert data into an array of integers */
358         for (i = 0; i < length; i++)
359                 data[i] = le32_to_cpu(buf[i]);
360 
361         kfree(buf);
362 
363         if (result != size) {
364                 dev_dbg(&port->dev, "%s - Unable to send config request, request=0x%x size=%d result=%d\n",
365                         __func__, request, size, result);
366                 if (result > 0)
367                         result = -EPROTO;
368 
369                 return result;
370         }
371 
372         return 0;
373 }
374 
375 /*
376  * cp210x_set_config
377  * Writes to the CP210x configuration registers
378  * Values less than 16 bits wide are sent directly
379  * 'size' is specified in bytes.
380  */
381 static int cp210x_set_config(struct usb_serial_port *port, u8 request,
382                 unsigned int *data, int size)
383 {
384         struct usb_serial *serial = port->serial;
385         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
386         __le32 *buf;
387         int result, i, length;
388 
389         /* Number of integers required to contain the array */
390         length = (((size - 1) | 3) + 1) / 4;
391 
392         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
393         if (!buf)
394                 return -ENOMEM;
395 
396         /* Array of integers into bytes */
397         for (i = 0; i < length; i++)
398                 buf[i] = cpu_to_le32(data[i]);
399 
400         if (size > 2) {
401                 result = usb_control_msg(serial->dev,
402                                 usb_sndctrlpipe(serial->dev, 0),
403                                 request, REQTYPE_HOST_TO_INTERFACE, 0x0000,
404                                 port_priv->bInterfaceNumber, buf, size,
405                                 USB_CTRL_SET_TIMEOUT);
406         } else {
407                 result = usb_control_msg(serial->dev,
408                                 usb_sndctrlpipe(serial->dev, 0),
409                                 request, REQTYPE_HOST_TO_INTERFACE, data[0],
410                                 port_priv->bInterfaceNumber, NULL, 0,
411                                 USB_CTRL_SET_TIMEOUT);
412         }
413 
414         kfree(buf);
415 
416         if ((size > 2 && result != size) || result < 0) {
417                 dev_dbg(&port->dev, "%s - Unable to send request, request=0x%x size=%d result=%d\n",
418                         __func__, request, size, result);
419                 if (result > 0)
420                         result = -EPROTO;
421 
422                 return result;
423         }
424 
425         return 0;
426 }
427 
428 /*
429  * cp210x_set_config_single
430  * Convenience function for calling cp210x_set_config on single data values
431  * without requiring an integer pointer
432  */
433 static inline int cp210x_set_config_single(struct usb_serial_port *port,
434                 u8 request, unsigned int data)
435 {
436         return cp210x_set_config(port, request, &data, 2);
437 }
438 
439 /*
440  * Detect CP2108 GET_LINE_CTL bug and activate workaround.
441  * Write a known good value 0x800, read it back.
442  * If it comes back swapped the bug is detected.
443  * Preserve the original register value.
444  */
445 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
446 {
447         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
448         unsigned int line_ctl_save;
449         unsigned int line_ctl_test;
450         int err;
451 
452         err = cp210x_get_config(port, CP210X_GET_LINE_CTL, &line_ctl_save, 2);
453         if (err)
454                 return err;
455 
456         line_ctl_test = 0x800;
457         err = cp210x_set_config(port, CP210X_SET_LINE_CTL, &line_ctl_test, 2);
458         if (err)
459                 return err;
460 
461         err = cp210x_get_config(port, CP210X_GET_LINE_CTL, &line_ctl_test, 2);
462         if (err)
463                 return err;
464 
465         if (line_ctl_test == 8) {
466                 port_priv->has_swapped_line_ctl = true;
467                 line_ctl_save = swab16((u16)line_ctl_save);
468         }
469 
470         return cp210x_set_config(port, CP210X_SET_LINE_CTL, &line_ctl_save, 2);
471 }
472 
473 /*
474  * Must always be called instead of cp210x_get_config(CP210X_GET_LINE_CTL)
475  * to workaround cp2108 bug and get correct value.
476  */
477 static int cp210x_get_line_ctl(struct usb_serial_port *port, unsigned int *ctl)
478 {
479         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
480         int err;
481 
482         err = cp210x_get_config(port, CP210X_GET_LINE_CTL, ctl, 2);
483         if (err)
484                 return err;
485 
486         /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
487         if (port_priv->has_swapped_line_ctl)
488                 *ctl = swab16((u16)(*ctl));
489 
490         return 0;
491 }
492 
493 /*
494  * cp210x_quantise_baudrate
495  * Quantises the baud rate as per AN205 Table 1
496  */
497 static unsigned int cp210x_quantise_baudrate(unsigned int baud)
498 {
499         if (baud <= 300)
500                 baud = 300;
501         else if (baud <= 600)      baud = 600;
502         else if (baud <= 1200)     baud = 1200;
503         else if (baud <= 1800)     baud = 1800;
504         else if (baud <= 2400)     baud = 2400;
505         else if (baud <= 4000)     baud = 4000;
506         else if (baud <= 4803)     baud = 4800;
507         else if (baud <= 7207)     baud = 7200;
508         else if (baud <= 9612)     baud = 9600;
509         else if (baud <= 14428)    baud = 14400;
510         else if (baud <= 16062)    baud = 16000;
511         else if (baud <= 19250)    baud = 19200;
512         else if (baud <= 28912)    baud = 28800;
513         else if (baud <= 38601)    baud = 38400;
514         else if (baud <= 51558)    baud = 51200;
515         else if (baud <= 56280)    baud = 56000;
516         else if (baud <= 58053)    baud = 57600;
517         else if (baud <= 64111)    baud = 64000;
518         else if (baud <= 77608)    baud = 76800;
519         else if (baud <= 117028)   baud = 115200;
520         else if (baud <= 129347)   baud = 128000;
521         else if (baud <= 156868)   baud = 153600;
522         else if (baud <= 237832)   baud = 230400;
523         else if (baud <= 254234)   baud = 250000;
524         else if (baud <= 273066)   baud = 256000;
525         else if (baud <= 491520)   baud = 460800;
526         else if (baud <= 567138)   baud = 500000;
527         else if (baud <= 670254)   baud = 576000;
528         else if (baud < 1000000)
529                 baud = 921600;
530         else if (baud > 2000000)
531                 baud = 2000000;
532         return baud;
533 }
534 
535 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
536 {
537         int result;
538 
539         result = cp210x_set_config_single(port, CP210X_IFC_ENABLE,
540                                                                 UART_ENABLE);
541         if (result) {
542                 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
543                 return result;
544         }
545 
546         /* Configure the termios structure */
547         cp210x_get_termios(tty, port);
548 
549         /* The baud rate must be initialised on cp2104 */
550         if (tty)
551                 cp210x_change_speed(tty, port, NULL);
552 
553         return usb_serial_generic_open(tty, port);
554 }
555 
556 static void cp210x_close(struct usb_serial_port *port)
557 {
558         unsigned int purge_ctl;
559 
560         usb_serial_generic_close(port);
561 
562         /* Clear both queues; cp2108 needs this to avoid an occasional hang */
563         purge_ctl = PURGE_ALL;
564         cp210x_set_config(port, CP210X_PURGE, &purge_ctl, 2);
565 
566         cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE);
567 }
568 
569 /*
570  * Read how many bytes are waiting in the TX queue.
571  */
572 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
573                 u32 *count)
574 {
575         struct usb_serial *serial = port->serial;
576         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
577         struct cp210x_comm_status *sts;
578         int result;
579 
580         sts = kmalloc(sizeof(*sts), GFP_KERNEL);
581         if (!sts)
582                 return -ENOMEM;
583 
584         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
585                         CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
586                         0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
587                         USB_CTRL_GET_TIMEOUT);
588         if (result == sizeof(*sts)) {
589                 *count = le32_to_cpu(sts->ulAmountInOutQueue);
590                 result = 0;
591         } else {
592                 dev_err(&port->dev, "failed to get comm status: %d\n", result);
593                 if (result >= 0)
594                         result = -EPROTO;
595         }
596 
597         kfree(sts);
598 
599         return result;
600 }
601 
602 static bool cp210x_tx_empty(struct usb_serial_port *port)
603 {
604         int err;
605         u32 count;
606 
607         err = cp210x_get_tx_queue_byte_count(port, &count);
608         if (err)
609                 return true;
610 
611         return !count;
612 }
613 
614 /*
615  * cp210x_get_termios
616  * Reads the baud rate, data bits, parity, stop bits and flow control mode
617  * from the device, corrects any unsupported values, and configures the
618  * termios structure to reflect the state of the device
619  */
620 static void cp210x_get_termios(struct tty_struct *tty,
621         struct usb_serial_port *port)
622 {
623         unsigned int baud;
624 
625         if (tty) {
626                 cp210x_get_termios_port(tty->driver_data,
627                         &tty->termios.c_cflag, &baud);
628                 tty_encode_baud_rate(tty, baud, baud);
629         } else {
630                 unsigned int cflag;
631                 cflag = 0;
632                 cp210x_get_termios_port(port, &cflag, &baud);
633         }
634 }
635 
636 /*
637  * cp210x_get_termios_port
638  * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
639  */
640 static void cp210x_get_termios_port(struct usb_serial_port *port,
641         unsigned int *cflagp, unsigned int *baudp)
642 {
643         struct device *dev = &port->dev;
644         unsigned int cflag, modem_ctl[4];
645         unsigned int baud;
646         unsigned int bits;
647 
648         cp210x_get_config(port, CP210X_GET_BAUDRATE, &baud, 4);
649 
650         dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
651         *baudp = baud;
652 
653         cflag = *cflagp;
654 
655         cp210x_get_line_ctl(port, &bits);
656         cflag &= ~CSIZE;
657         switch (bits & BITS_DATA_MASK) {
658         case BITS_DATA_5:
659                 dev_dbg(dev, "%s - data bits = 5\n", __func__);
660                 cflag |= CS5;
661                 break;
662         case BITS_DATA_6:
663                 dev_dbg(dev, "%s - data bits = 6\n", __func__);
664                 cflag |= CS6;
665                 break;
666         case BITS_DATA_7:
667                 dev_dbg(dev, "%s - data bits = 7\n", __func__);
668                 cflag |= CS7;
669                 break;
670         case BITS_DATA_8:
671                 dev_dbg(dev, "%s - data bits = 8\n", __func__);
672                 cflag |= CS8;
673                 break;
674         case BITS_DATA_9:
675                 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
676                 cflag |= CS8;
677                 bits &= ~BITS_DATA_MASK;
678                 bits |= BITS_DATA_8;
679                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
680                 break;
681         default:
682                 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
683                 cflag |= CS8;
684                 bits &= ~BITS_DATA_MASK;
685                 bits |= BITS_DATA_8;
686                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
687                 break;
688         }
689 
690         switch (bits & BITS_PARITY_MASK) {
691         case BITS_PARITY_NONE:
692                 dev_dbg(dev, "%s - parity = NONE\n", __func__);
693                 cflag &= ~PARENB;
694                 break;
695         case BITS_PARITY_ODD:
696                 dev_dbg(dev, "%s - parity = ODD\n", __func__);
697                 cflag |= (PARENB|PARODD);
698                 break;
699         case BITS_PARITY_EVEN:
700                 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
701                 cflag &= ~PARODD;
702                 cflag |= PARENB;
703                 break;
704         case BITS_PARITY_MARK:
705                 dev_dbg(dev, "%s - parity = MARK\n", __func__);
706                 cflag |= (PARENB|PARODD|CMSPAR);
707                 break;
708         case BITS_PARITY_SPACE:
709                 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
710                 cflag &= ~PARODD;
711                 cflag |= (PARENB|CMSPAR);
712                 break;
713         default:
714                 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
715                 cflag &= ~PARENB;
716                 bits &= ~BITS_PARITY_MASK;
717                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
718                 break;
719         }
720 
721         cflag &= ~CSTOPB;
722         switch (bits & BITS_STOP_MASK) {
723         case BITS_STOP_1:
724                 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
725                 break;
726         case BITS_STOP_1_5:
727                 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
728                 bits &= ~BITS_STOP_MASK;
729                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
730                 break;
731         case BITS_STOP_2:
732                 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
733                 cflag |= CSTOPB;
734                 break;
735         default:
736                 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
737                 bits &= ~BITS_STOP_MASK;
738                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
739                 break;
740         }
741 
742         cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
743         if (modem_ctl[0] & 0x0008) {
744                 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
745                 cflag |= CRTSCTS;
746         } else {
747                 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
748                 cflag &= ~CRTSCTS;
749         }
750 
751         *cflagp = cflag;
752 }
753 
754 /*
755  * CP2101 supports the following baud rates:
756  *
757  *      300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
758  *      38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
759  *
760  * CP2102 and CP2103 support the following additional rates:
761  *
762  *      4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
763  *      576000
764  *
765  * The device will map a requested rate to a supported one, but the result
766  * of requests for rates greater than 1053257 is undefined (see AN205).
767  *
768  * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
769  * respectively, with an error less than 1%. The actual rates are determined
770  * by
771  *
772  *      div = round(freq / (2 x prescale x request))
773  *      actual = freq / (2 x prescale x div)
774  *
775  * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
776  * or 1 otherwise.
777  * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
778  * otherwise.
779  */
780 static void cp210x_change_speed(struct tty_struct *tty,
781                 struct usb_serial_port *port, struct ktermios *old_termios)
782 {
783         u32 baud;
784 
785         baud = tty->termios.c_ospeed;
786 
787         /* This maps the requested rate to a rate valid on cp2102 or cp2103,
788          * or to an arbitrary rate in [1M,2M].
789          *
790          * NOTE: B0 is not implemented.
791          */
792         baud = cp210x_quantise_baudrate(baud);
793 
794         dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
795         if (cp210x_set_config(port, CP210X_SET_BAUDRATE, &baud,
796                                                         sizeof(baud))) {
797                 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
798                 if (old_termios)
799                         baud = old_termios->c_ospeed;
800                 else
801                         baud = 9600;
802         }
803 
804         tty_encode_baud_rate(tty, baud, baud);
805 }
806 
807 static void cp210x_set_termios(struct tty_struct *tty,
808                 struct usb_serial_port *port, struct ktermios *old_termios)
809 {
810         struct device *dev = &port->dev;
811         unsigned int cflag, old_cflag;
812         unsigned int bits;
813         unsigned int modem_ctl[4];
814 
815         cflag = tty->termios.c_cflag;
816         old_cflag = old_termios->c_cflag;
817 
818         if (tty->termios.c_ospeed != old_termios->c_ospeed)
819                 cp210x_change_speed(tty, port, old_termios);
820 
821         /* If the number of data bits is to be updated */
822         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
823                 cp210x_get_line_ctl(port, &bits);
824                 bits &= ~BITS_DATA_MASK;
825                 switch (cflag & CSIZE) {
826                 case CS5:
827                         bits |= BITS_DATA_5;
828                         dev_dbg(dev, "%s - data bits = 5\n", __func__);
829                         break;
830                 case CS6:
831                         bits |= BITS_DATA_6;
832                         dev_dbg(dev, "%s - data bits = 6\n", __func__);
833                         break;
834                 case CS7:
835                         bits |= BITS_DATA_7;
836                         dev_dbg(dev, "%s - data bits = 7\n", __func__);
837                         break;
838                 case CS8:
839                         bits |= BITS_DATA_8;
840                         dev_dbg(dev, "%s - data bits = 8\n", __func__);
841                         break;
842                 /*case CS9:
843                         bits |= BITS_DATA_9;
844                         dev_dbg(dev, "%s - data bits = 9\n", __func__);
845                         break;*/
846                 default:
847                         dev_dbg(dev, "cp210x driver does not support the number of bits requested, using 8 bit mode\n");
848                         bits |= BITS_DATA_8;
849                         break;
850                 }
851                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
852                         dev_dbg(dev, "Number of data bits requested not supported by device\n");
853         }
854 
855         if ((cflag     & (PARENB|PARODD|CMSPAR)) !=
856             (old_cflag & (PARENB|PARODD|CMSPAR))) {
857                 cp210x_get_line_ctl(port, &bits);
858                 bits &= ~BITS_PARITY_MASK;
859                 if (cflag & PARENB) {
860                         if (cflag & CMSPAR) {
861                                 if (cflag & PARODD) {
862                                         bits |= BITS_PARITY_MARK;
863                                         dev_dbg(dev, "%s - parity = MARK\n", __func__);
864                                 } else {
865                                         bits |= BITS_PARITY_SPACE;
866                                         dev_dbg(dev, "%s - parity = SPACE\n", __func__);
867                                 }
868                         } else {
869                                 if (cflag & PARODD) {
870                                         bits |= BITS_PARITY_ODD;
871                                         dev_dbg(dev, "%s - parity = ODD\n", __func__);
872                                 } else {
873                                         bits |= BITS_PARITY_EVEN;
874                                         dev_dbg(dev, "%s - parity = EVEN\n", __func__);
875                                 }
876                         }
877                 }
878                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
879                         dev_dbg(dev, "Parity mode not supported by device\n");
880         }
881 
882         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
883                 cp210x_get_line_ctl(port, &bits);
884                 bits &= ~BITS_STOP_MASK;
885                 if (cflag & CSTOPB) {
886                         bits |= BITS_STOP_2;
887                         dev_dbg(dev, "%s - stop bits = 2\n", __func__);
888                 } else {
889                         bits |= BITS_STOP_1;
890                         dev_dbg(dev, "%s - stop bits = 1\n", __func__);
891                 }
892                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
893                         dev_dbg(dev, "Number of stop bits requested not supported by device\n");
894         }
895 
896         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
897                 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
898                 dev_dbg(dev, "%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n",
899                         __func__, modem_ctl[0], modem_ctl[1],
900                         modem_ctl[2], modem_ctl[3]);
901 
902                 if (cflag & CRTSCTS) {
903                         modem_ctl[0] &= ~0x7B;
904                         modem_ctl[0] |= 0x09;
905                         modem_ctl[1] = 0x80;
906                         dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
907                 } else {
908                         modem_ctl[0] &= ~0x7B;
909                         modem_ctl[0] |= 0x01;
910                         modem_ctl[1] |= 0x40;
911                         dev_dbg(dev, "%s - flow control = NONE\n", __func__);
912                 }
913 
914                 dev_dbg(dev, "%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n",
915                         __func__, modem_ctl[0], modem_ctl[1],
916                         modem_ctl[2], modem_ctl[3]);
917                 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16);
918         }
919 
920 }
921 
922 static int cp210x_tiocmset(struct tty_struct *tty,
923                 unsigned int set, unsigned int clear)
924 {
925         struct usb_serial_port *port = tty->driver_data;
926         return cp210x_tiocmset_port(port, set, clear);
927 }
928 
929 static int cp210x_tiocmset_port(struct usb_serial_port *port,
930                 unsigned int set, unsigned int clear)
931 {
932         unsigned int control = 0;
933 
934         if (set & TIOCM_RTS) {
935                 control |= CONTROL_RTS;
936                 control |= CONTROL_WRITE_RTS;
937         }
938         if (set & TIOCM_DTR) {
939                 control |= CONTROL_DTR;
940                 control |= CONTROL_WRITE_DTR;
941         }
942         if (clear & TIOCM_RTS) {
943                 control &= ~CONTROL_RTS;
944                 control |= CONTROL_WRITE_RTS;
945         }
946         if (clear & TIOCM_DTR) {
947                 control &= ~CONTROL_DTR;
948                 control |= CONTROL_WRITE_DTR;
949         }
950 
951         dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
952 
953         return cp210x_set_config(port, CP210X_SET_MHS, &control, 2);
954 }
955 
956 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
957 {
958         if (on)
959                 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
960         else
961                 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
962 }
963 
964 static int cp210x_tiocmget(struct tty_struct *tty)
965 {
966         struct usb_serial_port *port = tty->driver_data;
967         unsigned int control;
968         int result;
969 
970         cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1);
971 
972         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
973                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
974                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
975                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
976                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
977                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
978 
979         dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
980 
981         return result;
982 }
983 
984 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
985 {
986         struct usb_serial_port *port = tty->driver_data;
987         unsigned int state;
988 
989         if (break_state == 0)
990                 state = BREAK_OFF;
991         else
992                 state = BREAK_ON;
993         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
994                 state == BREAK_OFF ? "off" : "on");
995         cp210x_set_config(port, CP210X_SET_BREAK, &state, 2);
996 }
997 
998 static int cp210x_port_probe(struct usb_serial_port *port)
999 {
1000         struct usb_serial *serial = port->serial;
1001         struct usb_host_interface *cur_altsetting;
1002         struct cp210x_port_private *port_priv;
1003         int ret;
1004 
1005         port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1006         if (!port_priv)
1007                 return -ENOMEM;
1008 
1009         cur_altsetting = serial->interface->cur_altsetting;
1010         port_priv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber;
1011 
1012         usb_set_serial_port_data(port, port_priv);
1013 
1014         ret = cp210x_detect_swapped_line_ctl(port);
1015         if (ret) {
1016                 kfree(port_priv);
1017                 return ret;
1018         }
1019 
1020         return 0;
1021 }
1022 
1023 static int cp210x_port_remove(struct usb_serial_port *port)
1024 {
1025         struct cp210x_port_private *port_priv;
1026 
1027         port_priv = usb_get_serial_port_data(port);
1028         kfree(port_priv);
1029 
1030         return 0;
1031 }
1032 
1033 module_usb_serial_driver(serial_drivers, id_table);
1034 
1035 MODULE_DESCRIPTION(DRIVER_DESC);
1036 MODULE_LICENSE("GPL");
1037 

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