Version:  2.0.40 2.2.26 2.4.37 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 4.6 4.7 4.8

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, 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 
208 MODULE_DEVICE_TABLE(usb, id_table);
209 
210 struct cp210x_port_private {
211         __u8                    bInterfaceNumber;
212         bool                    has_swapped_line_ctl;
213 };
214 
215 static 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 
236 static 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 */
316 struct 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 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
335 struct cp210x_flow_ctl {
336         __le32  ulControlHandshake;
337         __le32  ulFlowReplace;
338         __le32  ulXonLimit;
339         __le32  ulXoffLimit;
340 } __packed;
341 
342 /* cp210x_flow_ctl::ulControlHandshake */
343 #define CP210X_SERIAL_DTR_MASK          GENMASK(1, 0)
344 #define CP210X_SERIAL_DTR_SHIFT(_mode)  (_mode)
345 #define CP210X_SERIAL_CTS_HANDSHAKE     BIT(3)
346 #define CP210X_SERIAL_DSR_HANDSHAKE     BIT(4)
347 #define CP210X_SERIAL_DCD_HANDSHAKE     BIT(5)
348 #define CP210X_SERIAL_DSR_SENSITIVITY   BIT(6)
349 
350 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */
351 #define CP210X_SERIAL_DTR_INACTIVE      0
352 #define CP210X_SERIAL_DTR_ACTIVE        1
353 #define CP210X_SERIAL_DTR_FLOW_CTL      2
354 
355 /* cp210x_flow_ctl::ulFlowReplace */
356 #define CP210X_SERIAL_AUTO_TRANSMIT     BIT(0)
357 #define CP210X_SERIAL_AUTO_RECEIVE      BIT(1)
358 #define CP210X_SERIAL_ERROR_CHAR        BIT(2)
359 #define CP210X_SERIAL_NULL_STRIPPING    BIT(3)
360 #define CP210X_SERIAL_BREAK_CHAR        BIT(4)
361 #define CP210X_SERIAL_RTS_MASK          GENMASK(7, 6)
362 #define CP210X_SERIAL_RTS_SHIFT(_mode)  (_mode << 6)
363 #define CP210X_SERIAL_XOFF_CONTINUE     BIT(31)
364 
365 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */
366 #define CP210X_SERIAL_RTS_INACTIVE      0
367 #define CP210X_SERIAL_RTS_ACTIVE        1
368 #define CP210X_SERIAL_RTS_FLOW_CTL      2
369 
370 /*
371  * Reads a variable-sized block of CP210X_ registers, identified by req.
372  * Returns data into buf in native USB byte order.
373  */
374 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
375                 void *buf, int bufsize)
376 {
377         struct usb_serial *serial = port->serial;
378         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
379         void *dmabuf;
380         int result;
381 
382         dmabuf = kmalloc(bufsize, GFP_KERNEL);
383         if (!dmabuf) {
384                 /*
385                  * FIXME Some callers don't bother to check for error,
386                  * at least give them consistent junk until they are fixed
387                  */
388                 memset(buf, 0, bufsize);
389                 return -ENOMEM;
390         }
391 
392         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
393                         req, REQTYPE_INTERFACE_TO_HOST, 0,
394                         port_priv->bInterfaceNumber, dmabuf, bufsize,
395                         USB_CTRL_SET_TIMEOUT);
396         if (result == bufsize) {
397                 memcpy(buf, dmabuf, bufsize);
398                 result = 0;
399         } else {
400                 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
401                                 req, bufsize, result);
402                 if (result >= 0)
403                         result = -EPROTO;
404 
405                 /*
406                  * FIXME Some callers don't bother to check for error,
407                  * at least give them consistent junk until they are fixed
408                  */
409                 memset(buf, 0, bufsize);
410         }
411 
412         kfree(dmabuf);
413 
414         return result;
415 }
416 
417 /*
418  * Reads any 32-bit CP210X_ register identified by req.
419  */
420 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val)
421 {
422         __le32 le32_val;
423         int err;
424 
425         err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val));
426         if (err) {
427                 /*
428                  * FIXME Some callers don't bother to check for error,
429                  * at least give them consistent junk until they are fixed
430                  */
431                 *val = 0;
432                 return err;
433         }
434 
435         *val = le32_to_cpu(le32_val);
436 
437         return 0;
438 }
439 
440 /*
441  * Reads any 16-bit CP210X_ register identified by req.
442  */
443 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val)
444 {
445         __le16 le16_val;
446         int err;
447 
448         err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val));
449         if (err)
450                 return err;
451 
452         *val = le16_to_cpu(le16_val);
453 
454         return 0;
455 }
456 
457 /*
458  * Reads any 8-bit CP210X_ register identified by req.
459  */
460 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
461 {
462         return cp210x_read_reg_block(port, req, val, sizeof(*val));
463 }
464 
465 /*
466  * Writes any 16-bit CP210X_ register (req) whose value is passed
467  * entirely in the wValue field of the USB request.
468  */
469 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
470 {
471         struct usb_serial *serial = port->serial;
472         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
473         int result;
474 
475         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
476                         req, REQTYPE_HOST_TO_INTERFACE, val,
477                         port_priv->bInterfaceNumber, NULL, 0,
478                         USB_CTRL_SET_TIMEOUT);
479         if (result < 0) {
480                 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
481                                 req, result);
482         }
483 
484         return result;
485 }
486 
487 /*
488  * Writes a variable-sized block of CP210X_ registers, identified by req.
489  * Data in buf must be in native USB byte order.
490  */
491 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
492                 void *buf, int bufsize)
493 {
494         struct usb_serial *serial = port->serial;
495         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
496         void *dmabuf;
497         int result;
498 
499         dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
500         if (!dmabuf)
501                 return -ENOMEM;
502 
503         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
504                         req, REQTYPE_HOST_TO_INTERFACE, 0,
505                         port_priv->bInterfaceNumber, dmabuf, bufsize,
506                         USB_CTRL_SET_TIMEOUT);
507 
508         kfree(dmabuf);
509 
510         if (result == bufsize) {
511                 result = 0;
512         } else {
513                 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
514                                 req, bufsize, result);
515                 if (result >= 0)
516                         result = -EPROTO;
517         }
518 
519         return result;
520 }
521 
522 /*
523  * Writes any 32-bit CP210X_ register identified by req.
524  */
525 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
526 {
527         __le32 le32_val;
528 
529         le32_val = cpu_to_le32(val);
530 
531         return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
532 }
533 
534 /*
535  * Detect CP2108 GET_LINE_CTL bug and activate workaround.
536  * Write a known good value 0x800, read it back.
537  * If it comes back swapped the bug is detected.
538  * Preserve the original register value.
539  */
540 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
541 {
542         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
543         u16 line_ctl_save;
544         u16 line_ctl_test;
545         int err;
546 
547         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save);
548         if (err)
549                 return err;
550 
551         err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800);
552         if (err)
553                 return err;
554 
555         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test);
556         if (err)
557                 return err;
558 
559         if (line_ctl_test == 8) {
560                 port_priv->has_swapped_line_ctl = true;
561                 line_ctl_save = swab16(line_ctl_save);
562         }
563 
564         return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save);
565 }
566 
567 /*
568  * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL)
569  * to workaround cp2108 bug and get correct value.
570  */
571 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl)
572 {
573         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
574         int err;
575 
576         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl);
577         if (err)
578                 return err;
579 
580         /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
581         if (port_priv->has_swapped_line_ctl)
582                 *ctl = swab16(*ctl);
583 
584         return 0;
585 }
586 
587 /*
588  * cp210x_quantise_baudrate
589  * Quantises the baud rate as per AN205 Table 1
590  */
591 static unsigned int cp210x_quantise_baudrate(unsigned int baud)
592 {
593         if (baud <= 300)
594                 baud = 300;
595         else if (baud <= 600)      baud = 600;
596         else if (baud <= 1200)     baud = 1200;
597         else if (baud <= 1800)     baud = 1800;
598         else if (baud <= 2400)     baud = 2400;
599         else if (baud <= 4000)     baud = 4000;
600         else if (baud <= 4803)     baud = 4800;
601         else if (baud <= 7207)     baud = 7200;
602         else if (baud <= 9612)     baud = 9600;
603         else if (baud <= 14428)    baud = 14400;
604         else if (baud <= 16062)    baud = 16000;
605         else if (baud <= 19250)    baud = 19200;
606         else if (baud <= 28912)    baud = 28800;
607         else if (baud <= 38601)    baud = 38400;
608         else if (baud <= 51558)    baud = 51200;
609         else if (baud <= 56280)    baud = 56000;
610         else if (baud <= 58053)    baud = 57600;
611         else if (baud <= 64111)    baud = 64000;
612         else if (baud <= 77608)    baud = 76800;
613         else if (baud <= 117028)   baud = 115200;
614         else if (baud <= 129347)   baud = 128000;
615         else if (baud <= 156868)   baud = 153600;
616         else if (baud <= 237832)   baud = 230400;
617         else if (baud <= 254234)   baud = 250000;
618         else if (baud <= 273066)   baud = 256000;
619         else if (baud <= 491520)   baud = 460800;
620         else if (baud <= 567138)   baud = 500000;
621         else if (baud <= 670254)   baud = 576000;
622         else if (baud < 1000000)
623                 baud = 921600;
624         else if (baud > 2000000)
625                 baud = 2000000;
626         return baud;
627 }
628 
629 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
630 {
631         int result;
632 
633         result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
634         if (result) {
635                 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
636                 return result;
637         }
638 
639         /* Configure the termios structure */
640         cp210x_get_termios(tty, port);
641 
642         /* The baud rate must be initialised on cp2104 */
643         if (tty)
644                 cp210x_change_speed(tty, port, NULL);
645 
646         return usb_serial_generic_open(tty, port);
647 }
648 
649 static void cp210x_close(struct usb_serial_port *port)
650 {
651         usb_serial_generic_close(port);
652 
653         /* Clear both queues; cp2108 needs this to avoid an occasional hang */
654         cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
655 
656         cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
657 }
658 
659 /*
660  * Read how many bytes are waiting in the TX queue.
661  */
662 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
663                 u32 *count)
664 {
665         struct usb_serial *serial = port->serial;
666         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
667         struct cp210x_comm_status *sts;
668         int result;
669 
670         sts = kmalloc(sizeof(*sts), GFP_KERNEL);
671         if (!sts)
672                 return -ENOMEM;
673 
674         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
675                         CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
676                         0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
677                         USB_CTRL_GET_TIMEOUT);
678         if (result == sizeof(*sts)) {
679                 *count = le32_to_cpu(sts->ulAmountInOutQueue);
680                 result = 0;
681         } else {
682                 dev_err(&port->dev, "failed to get comm status: %d\n", result);
683                 if (result >= 0)
684                         result = -EPROTO;
685         }
686 
687         kfree(sts);
688 
689         return result;
690 }
691 
692 static bool cp210x_tx_empty(struct usb_serial_port *port)
693 {
694         int err;
695         u32 count;
696 
697         err = cp210x_get_tx_queue_byte_count(port, &count);
698         if (err)
699                 return true;
700 
701         return !count;
702 }
703 
704 /*
705  * cp210x_get_termios
706  * Reads the baud rate, data bits, parity, stop bits and flow control mode
707  * from the device, corrects any unsupported values, and configures the
708  * termios structure to reflect the state of the device
709  */
710 static void cp210x_get_termios(struct tty_struct *tty,
711         struct usb_serial_port *port)
712 {
713         unsigned int baud;
714 
715         if (tty) {
716                 cp210x_get_termios_port(tty->driver_data,
717                         &tty->termios.c_cflag, &baud);
718                 tty_encode_baud_rate(tty, baud, baud);
719         } else {
720                 unsigned int cflag;
721                 cflag = 0;
722                 cp210x_get_termios_port(port, &cflag, &baud);
723         }
724 }
725 
726 /*
727  * cp210x_get_termios_port
728  * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
729  */
730 static void cp210x_get_termios_port(struct usb_serial_port *port,
731         unsigned int *cflagp, unsigned int *baudp)
732 {
733         struct device *dev = &port->dev;
734         unsigned int cflag;
735         struct cp210x_flow_ctl flow_ctl;
736         u32 baud;
737         u16 bits;
738         u32 ctl_hs;
739 
740         cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud);
741 
742         dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
743         *baudp = baud;
744 
745         cflag = *cflagp;
746 
747         cp210x_get_line_ctl(port, &bits);
748         cflag &= ~CSIZE;
749         switch (bits & BITS_DATA_MASK) {
750         case BITS_DATA_5:
751                 dev_dbg(dev, "%s - data bits = 5\n", __func__);
752                 cflag |= CS5;
753                 break;
754         case BITS_DATA_6:
755                 dev_dbg(dev, "%s - data bits = 6\n", __func__);
756                 cflag |= CS6;
757                 break;
758         case BITS_DATA_7:
759                 dev_dbg(dev, "%s - data bits = 7\n", __func__);
760                 cflag |= CS7;
761                 break;
762         case BITS_DATA_8:
763                 dev_dbg(dev, "%s - data bits = 8\n", __func__);
764                 cflag |= CS8;
765                 break;
766         case BITS_DATA_9:
767                 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
768                 cflag |= CS8;
769                 bits &= ~BITS_DATA_MASK;
770                 bits |= BITS_DATA_8;
771                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
772                 break;
773         default:
774                 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
775                 cflag |= CS8;
776                 bits &= ~BITS_DATA_MASK;
777                 bits |= BITS_DATA_8;
778                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
779                 break;
780         }
781 
782         switch (bits & BITS_PARITY_MASK) {
783         case BITS_PARITY_NONE:
784                 dev_dbg(dev, "%s - parity = NONE\n", __func__);
785                 cflag &= ~PARENB;
786                 break;
787         case BITS_PARITY_ODD:
788                 dev_dbg(dev, "%s - parity = ODD\n", __func__);
789                 cflag |= (PARENB|PARODD);
790                 break;
791         case BITS_PARITY_EVEN:
792                 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
793                 cflag &= ~PARODD;
794                 cflag |= PARENB;
795                 break;
796         case BITS_PARITY_MARK:
797                 dev_dbg(dev, "%s - parity = MARK\n", __func__);
798                 cflag |= (PARENB|PARODD|CMSPAR);
799                 break;
800         case BITS_PARITY_SPACE:
801                 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
802                 cflag &= ~PARODD;
803                 cflag |= (PARENB|CMSPAR);
804                 break;
805         default:
806                 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
807                 cflag &= ~PARENB;
808                 bits &= ~BITS_PARITY_MASK;
809                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
810                 break;
811         }
812 
813         cflag &= ~CSTOPB;
814         switch (bits & BITS_STOP_MASK) {
815         case BITS_STOP_1:
816                 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
817                 break;
818         case BITS_STOP_1_5:
819                 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
820                 bits &= ~BITS_STOP_MASK;
821                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
822                 break;
823         case BITS_STOP_2:
824                 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
825                 cflag |= CSTOPB;
826                 break;
827         default:
828                 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
829                 bits &= ~BITS_STOP_MASK;
830                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
831                 break;
832         }
833 
834         cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
835                         sizeof(flow_ctl));
836         ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
837         if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) {
838                 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
839                 cflag |= CRTSCTS;
840         } else {
841                 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
842                 cflag &= ~CRTSCTS;
843         }
844 
845         *cflagp = cflag;
846 }
847 
848 /*
849  * CP2101 supports the following baud rates:
850  *
851  *      300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
852  *      38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
853  *
854  * CP2102 and CP2103 support the following additional rates:
855  *
856  *      4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
857  *      576000
858  *
859  * The device will map a requested rate to a supported one, but the result
860  * of requests for rates greater than 1053257 is undefined (see AN205).
861  *
862  * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
863  * respectively, with an error less than 1%. The actual rates are determined
864  * by
865  *
866  *      div = round(freq / (2 x prescale x request))
867  *      actual = freq / (2 x prescale x div)
868  *
869  * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
870  * or 1 otherwise.
871  * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
872  * otherwise.
873  */
874 static void cp210x_change_speed(struct tty_struct *tty,
875                 struct usb_serial_port *port, struct ktermios *old_termios)
876 {
877         u32 baud;
878 
879         baud = tty->termios.c_ospeed;
880 
881         /* This maps the requested rate to a rate valid on cp2102 or cp2103,
882          * or to an arbitrary rate in [1M,2M].
883          *
884          * NOTE: B0 is not implemented.
885          */
886         baud = cp210x_quantise_baudrate(baud);
887 
888         dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
889         if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
890                 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
891                 if (old_termios)
892                         baud = old_termios->c_ospeed;
893                 else
894                         baud = 9600;
895         }
896 
897         tty_encode_baud_rate(tty, baud, baud);
898 }
899 
900 static void cp210x_set_termios(struct tty_struct *tty,
901                 struct usb_serial_port *port, struct ktermios *old_termios)
902 {
903         struct device *dev = &port->dev;
904         unsigned int cflag, old_cflag;
905         u16 bits;
906 
907         cflag = tty->termios.c_cflag;
908         old_cflag = old_termios->c_cflag;
909 
910         if (tty->termios.c_ospeed != old_termios->c_ospeed)
911                 cp210x_change_speed(tty, port, old_termios);
912 
913         /* If the number of data bits is to be updated */
914         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
915                 cp210x_get_line_ctl(port, &bits);
916                 bits &= ~BITS_DATA_MASK;
917                 switch (cflag & CSIZE) {
918                 case CS5:
919                         bits |= BITS_DATA_5;
920                         dev_dbg(dev, "%s - data bits = 5\n", __func__);
921                         break;
922                 case CS6:
923                         bits |= BITS_DATA_6;
924                         dev_dbg(dev, "%s - data bits = 6\n", __func__);
925                         break;
926                 case CS7:
927                         bits |= BITS_DATA_7;
928                         dev_dbg(dev, "%s - data bits = 7\n", __func__);
929                         break;
930                 case CS8:
931                         bits |= BITS_DATA_8;
932                         dev_dbg(dev, "%s - data bits = 8\n", __func__);
933                         break;
934                 /*case CS9:
935                         bits |= BITS_DATA_9;
936                         dev_dbg(dev, "%s - data bits = 9\n", __func__);
937                         break;*/
938                 default:
939                         dev_dbg(dev, "cp210x driver does not support the number of bits requested, using 8 bit mode\n");
940                         bits |= BITS_DATA_8;
941                         break;
942                 }
943                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
944                         dev_dbg(dev, "Number of data bits requested not supported by device\n");
945         }
946 
947         if ((cflag     & (PARENB|PARODD|CMSPAR)) !=
948             (old_cflag & (PARENB|PARODD|CMSPAR))) {
949                 cp210x_get_line_ctl(port, &bits);
950                 bits &= ~BITS_PARITY_MASK;
951                 if (cflag & PARENB) {
952                         if (cflag & CMSPAR) {
953                                 if (cflag & PARODD) {
954                                         bits |= BITS_PARITY_MARK;
955                                         dev_dbg(dev, "%s - parity = MARK\n", __func__);
956                                 } else {
957                                         bits |= BITS_PARITY_SPACE;
958                                         dev_dbg(dev, "%s - parity = SPACE\n", __func__);
959                                 }
960                         } else {
961                                 if (cflag & PARODD) {
962                                         bits |= BITS_PARITY_ODD;
963                                         dev_dbg(dev, "%s - parity = ODD\n", __func__);
964                                 } else {
965                                         bits |= BITS_PARITY_EVEN;
966                                         dev_dbg(dev, "%s - parity = EVEN\n", __func__);
967                                 }
968                         }
969                 }
970                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
971                         dev_dbg(dev, "Parity mode not supported by device\n");
972         }
973 
974         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
975                 cp210x_get_line_ctl(port, &bits);
976                 bits &= ~BITS_STOP_MASK;
977                 if (cflag & CSTOPB) {
978                         bits |= BITS_STOP_2;
979                         dev_dbg(dev, "%s - stop bits = 2\n", __func__);
980                 } else {
981                         bits |= BITS_STOP_1;
982                         dev_dbg(dev, "%s - stop bits = 1\n", __func__);
983                 }
984                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
985                         dev_dbg(dev, "Number of stop bits requested not supported by device\n");
986         }
987 
988         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
989                 struct cp210x_flow_ctl flow_ctl;
990                 u32 ctl_hs;
991                 u32 flow_repl;
992 
993                 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
994                                 sizeof(flow_ctl));
995                 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
996                 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
997                 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
998                                 __func__, ctl_hs, flow_repl);
999 
1000                 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1001                 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1002                 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1003                 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1004                 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE);
1005                 if (cflag & CRTSCTS) {
1006                         ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1007 
1008                         flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1009                         flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1010                                         CP210X_SERIAL_RTS_FLOW_CTL);
1011                         dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1012                 } else {
1013                         ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1014 
1015                         flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1016                         flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1017                                         CP210X_SERIAL_RTS_ACTIVE);
1018                         dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1019                 }
1020 
1021                 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1022                                 __func__, ctl_hs, flow_repl);
1023                 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1024                 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1025                 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1026                                 sizeof(flow_ctl));
1027         }
1028 
1029 }
1030 
1031 static int cp210x_tiocmset(struct tty_struct *tty,
1032                 unsigned int set, unsigned int clear)
1033 {
1034         struct usb_serial_port *port = tty->driver_data;
1035         return cp210x_tiocmset_port(port, set, clear);
1036 }
1037 
1038 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1039                 unsigned int set, unsigned int clear)
1040 {
1041         u16 control = 0;
1042 
1043         if (set & TIOCM_RTS) {
1044                 control |= CONTROL_RTS;
1045                 control |= CONTROL_WRITE_RTS;
1046         }
1047         if (set & TIOCM_DTR) {
1048                 control |= CONTROL_DTR;
1049                 control |= CONTROL_WRITE_DTR;
1050         }
1051         if (clear & TIOCM_RTS) {
1052                 control &= ~CONTROL_RTS;
1053                 control |= CONTROL_WRITE_RTS;
1054         }
1055         if (clear & TIOCM_DTR) {
1056                 control &= ~CONTROL_DTR;
1057                 control |= CONTROL_WRITE_DTR;
1058         }
1059 
1060         dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
1061 
1062         return cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1063 }
1064 
1065 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
1066 {
1067         if (on)
1068                 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
1069         else
1070                 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
1071 }
1072 
1073 static int cp210x_tiocmget(struct tty_struct *tty)
1074 {
1075         struct usb_serial_port *port = tty->driver_data;
1076         u8 control;
1077         int result;
1078 
1079         cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1080 
1081         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1082                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1083                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1084                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1085                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
1086                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
1087 
1088         dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
1089 
1090         return result;
1091 }
1092 
1093 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1094 {
1095         struct usb_serial_port *port = tty->driver_data;
1096         u16 state;
1097 
1098         if (break_state == 0)
1099                 state = BREAK_OFF;
1100         else
1101                 state = BREAK_ON;
1102         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1103                 state == BREAK_OFF ? "off" : "on");
1104         cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1105 }
1106 
1107 static int cp210x_port_probe(struct usb_serial_port *port)
1108 {
1109         struct usb_serial *serial = port->serial;
1110         struct usb_host_interface *cur_altsetting;
1111         struct cp210x_port_private *port_priv;
1112         int ret;
1113 
1114         port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1115         if (!port_priv)
1116                 return -ENOMEM;
1117 
1118         cur_altsetting = serial->interface->cur_altsetting;
1119         port_priv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber;
1120 
1121         usb_set_serial_port_data(port, port_priv);
1122 
1123         ret = cp210x_detect_swapped_line_ctl(port);
1124         if (ret) {
1125                 kfree(port_priv);
1126                 return ret;
1127         }
1128 
1129         return 0;
1130 }
1131 
1132 static int cp210x_port_remove(struct usb_serial_port *port)
1133 {
1134         struct cp210x_port_private *port_priv;
1135 
1136         port_priv = usb_get_serial_port_data(port);
1137         kfree(port_priv);
1138 
1139         return 0;
1140 }
1141 
1142 module_usb_serial_driver(serial_drivers, id_table);
1143 
1144 MODULE_DESCRIPTION(DRIVER_DESC);
1145 MODULE_LICENSE("GPL");
1146 

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