Version:  2.0.40 2.2.26 2.4.37 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 4.9

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, 0x8470) }, /* Juniper Networks BX Series System Console */
122         { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
123         { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
124         { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
125         { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
126         { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
127         { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
128         { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
129         { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
130         { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
131         { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
132         { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
133         { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
134         { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */
135         { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
136         { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
137         { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
138         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
139         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
140         { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
141         { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
142         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
143         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
144         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
145         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
146         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
147         { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
148         { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
149         { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
150         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
151         { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
152         { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
153         { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
154         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
155         { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
156         { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
157         { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
158         { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
159         { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
160         { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
161         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
162         { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
163         { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
164         { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
165         { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
166         { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
167         { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
168         { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
169         { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
170         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
171         { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
172         { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
173         { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
174         { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
175         { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
176         { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
177         { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
178         { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
179         { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
180         { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
181         { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
182         { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
183         { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
184         { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
185         { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
186         { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
187         { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
188         { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
189         { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
190         { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
191         { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
192         { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
193         { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
194         { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
195         { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
196         { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
197         { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
198         { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
199         { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
200         { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
201         { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
202         { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
203         { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
204         { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
205         { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
206         { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
207         { } /* Terminating Entry */
208 };
209 
210 MODULE_DEVICE_TABLE(usb, id_table);
211 
212 struct cp210x_port_private {
213         __u8                    bInterfaceNumber;
214         bool                    has_swapped_line_ctl;
215 };
216 
217 static struct usb_serial_driver cp210x_device = {
218         .driver = {
219                 .owner =        THIS_MODULE,
220                 .name =         "cp210x",
221         },
222         .id_table               = id_table,
223         .num_ports              = 1,
224         .bulk_in_size           = 256,
225         .bulk_out_size          = 256,
226         .open                   = cp210x_open,
227         .close                  = cp210x_close,
228         .break_ctl              = cp210x_break_ctl,
229         .set_termios            = cp210x_set_termios,
230         .tx_empty               = cp210x_tx_empty,
231         .tiocmget               = cp210x_tiocmget,
232         .tiocmset               = cp210x_tiocmset,
233         .port_probe             = cp210x_port_probe,
234         .port_remove            = cp210x_port_remove,
235         .dtr_rts                = cp210x_dtr_rts
236 };
237 
238 static struct usb_serial_driver * const serial_drivers[] = {
239         &cp210x_device, NULL
240 };
241 
242 /* Config request types */
243 #define REQTYPE_HOST_TO_INTERFACE       0x41
244 #define REQTYPE_INTERFACE_TO_HOST       0xc1
245 #define REQTYPE_HOST_TO_DEVICE  0x40
246 #define REQTYPE_DEVICE_TO_HOST  0xc0
247 
248 /* Config request codes */
249 #define CP210X_IFC_ENABLE       0x00
250 #define CP210X_SET_BAUDDIV      0x01
251 #define CP210X_GET_BAUDDIV      0x02
252 #define CP210X_SET_LINE_CTL     0x03
253 #define CP210X_GET_LINE_CTL     0x04
254 #define CP210X_SET_BREAK        0x05
255 #define CP210X_IMM_CHAR         0x06
256 #define CP210X_SET_MHS          0x07
257 #define CP210X_GET_MDMSTS       0x08
258 #define CP210X_SET_XON          0x09
259 #define CP210X_SET_XOFF         0x0A
260 #define CP210X_SET_EVENTMASK    0x0B
261 #define CP210X_GET_EVENTMASK    0x0C
262 #define CP210X_SET_CHAR         0x0D
263 #define CP210X_GET_CHARS        0x0E
264 #define CP210X_GET_PROPS        0x0F
265 #define CP210X_GET_COMM_STATUS  0x10
266 #define CP210X_RESET            0x11
267 #define CP210X_PURGE            0x12
268 #define CP210X_SET_FLOW         0x13
269 #define CP210X_GET_FLOW         0x14
270 #define CP210X_EMBED_EVENTS     0x15
271 #define CP210X_GET_EVENTSTATE   0x16
272 #define CP210X_SET_CHARS        0x19
273 #define CP210X_GET_BAUDRATE     0x1D
274 #define CP210X_SET_BAUDRATE     0x1E
275 
276 /* CP210X_IFC_ENABLE */
277 #define UART_ENABLE             0x0001
278 #define UART_DISABLE            0x0000
279 
280 /* CP210X_(SET|GET)_BAUDDIV */
281 #define BAUD_RATE_GEN_FREQ      0x384000
282 
283 /* CP210X_(SET|GET)_LINE_CTL */
284 #define BITS_DATA_MASK          0X0f00
285 #define BITS_DATA_5             0X0500
286 #define BITS_DATA_6             0X0600
287 #define BITS_DATA_7             0X0700
288 #define BITS_DATA_8             0X0800
289 #define BITS_DATA_9             0X0900
290 
291 #define BITS_PARITY_MASK        0x00f0
292 #define BITS_PARITY_NONE        0x0000
293 #define BITS_PARITY_ODD         0x0010
294 #define BITS_PARITY_EVEN        0x0020
295 #define BITS_PARITY_MARK        0x0030
296 #define BITS_PARITY_SPACE       0x0040
297 
298 #define BITS_STOP_MASK          0x000f
299 #define BITS_STOP_1             0x0000
300 #define BITS_STOP_1_5           0x0001
301 #define BITS_STOP_2             0x0002
302 
303 /* CP210X_SET_BREAK */
304 #define BREAK_ON                0x0001
305 #define BREAK_OFF               0x0000
306 
307 /* CP210X_(SET_MHS|GET_MDMSTS) */
308 #define CONTROL_DTR             0x0001
309 #define CONTROL_RTS             0x0002
310 #define CONTROL_CTS             0x0010
311 #define CONTROL_DSR             0x0020
312 #define CONTROL_RING            0x0040
313 #define CONTROL_DCD             0x0080
314 #define CONTROL_WRITE_DTR       0x0100
315 #define CONTROL_WRITE_RTS       0x0200
316 
317 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
318 struct cp210x_comm_status {
319         __le32   ulErrors;
320         __le32   ulHoldReasons;
321         __le32   ulAmountInInQueue;
322         __le32   ulAmountInOutQueue;
323         u8       bEofReceived;
324         u8       bWaitForImmediate;
325         u8       bReserved;
326 } __packed;
327 
328 /*
329  * CP210X_PURGE - 16 bits passed in wValue of USB request.
330  * SiLabs app note AN571 gives a strange description of the 4 bits:
331  * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
332  * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
333  */
334 #define PURGE_ALL               0x000f
335 
336 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
337 struct cp210x_flow_ctl {
338         __le32  ulControlHandshake;
339         __le32  ulFlowReplace;
340         __le32  ulXonLimit;
341         __le32  ulXoffLimit;
342 } __packed;
343 
344 /* cp210x_flow_ctl::ulControlHandshake */
345 #define CP210X_SERIAL_DTR_MASK          GENMASK(1, 0)
346 #define CP210X_SERIAL_DTR_SHIFT(_mode)  (_mode)
347 #define CP210X_SERIAL_CTS_HANDSHAKE     BIT(3)
348 #define CP210X_SERIAL_DSR_HANDSHAKE     BIT(4)
349 #define CP210X_SERIAL_DCD_HANDSHAKE     BIT(5)
350 #define CP210X_SERIAL_DSR_SENSITIVITY   BIT(6)
351 
352 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */
353 #define CP210X_SERIAL_DTR_INACTIVE      0
354 #define CP210X_SERIAL_DTR_ACTIVE        1
355 #define CP210X_SERIAL_DTR_FLOW_CTL      2
356 
357 /* cp210x_flow_ctl::ulFlowReplace */
358 #define CP210X_SERIAL_AUTO_TRANSMIT     BIT(0)
359 #define CP210X_SERIAL_AUTO_RECEIVE      BIT(1)
360 #define CP210X_SERIAL_ERROR_CHAR        BIT(2)
361 #define CP210X_SERIAL_NULL_STRIPPING    BIT(3)
362 #define CP210X_SERIAL_BREAK_CHAR        BIT(4)
363 #define CP210X_SERIAL_RTS_MASK          GENMASK(7, 6)
364 #define CP210X_SERIAL_RTS_SHIFT(_mode)  (_mode << 6)
365 #define CP210X_SERIAL_XOFF_CONTINUE     BIT(31)
366 
367 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */
368 #define CP210X_SERIAL_RTS_INACTIVE      0
369 #define CP210X_SERIAL_RTS_ACTIVE        1
370 #define CP210X_SERIAL_RTS_FLOW_CTL      2
371 
372 /*
373  * Reads a variable-sized block of CP210X_ registers, identified by req.
374  * Returns data into buf in native USB byte order.
375  */
376 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
377                 void *buf, int bufsize)
378 {
379         struct usb_serial *serial = port->serial;
380         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
381         void *dmabuf;
382         int result;
383 
384         dmabuf = kmalloc(bufsize, GFP_KERNEL);
385         if (!dmabuf) {
386                 /*
387                  * FIXME Some callers don't bother to check for error,
388                  * at least give them consistent junk until they are fixed
389                  */
390                 memset(buf, 0, bufsize);
391                 return -ENOMEM;
392         }
393 
394         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
395                         req, REQTYPE_INTERFACE_TO_HOST, 0,
396                         port_priv->bInterfaceNumber, dmabuf, bufsize,
397                         USB_CTRL_SET_TIMEOUT);
398         if (result == bufsize) {
399                 memcpy(buf, dmabuf, bufsize);
400                 result = 0;
401         } else {
402                 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
403                                 req, bufsize, result);
404                 if (result >= 0)
405                         result = -EPROTO;
406 
407                 /*
408                  * FIXME Some callers don't bother to check for error,
409                  * at least give them consistent junk until they are fixed
410                  */
411                 memset(buf, 0, bufsize);
412         }
413 
414         kfree(dmabuf);
415 
416         return result;
417 }
418 
419 /*
420  * Reads any 32-bit CP210X_ register identified by req.
421  */
422 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val)
423 {
424         __le32 le32_val;
425         int err;
426 
427         err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val));
428         if (err) {
429                 /*
430                  * FIXME Some callers don't bother to check for error,
431                  * at least give them consistent junk until they are fixed
432                  */
433                 *val = 0;
434                 return err;
435         }
436 
437         *val = le32_to_cpu(le32_val);
438 
439         return 0;
440 }
441 
442 /*
443  * Reads any 16-bit CP210X_ register identified by req.
444  */
445 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val)
446 {
447         __le16 le16_val;
448         int err;
449 
450         err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val));
451         if (err)
452                 return err;
453 
454         *val = le16_to_cpu(le16_val);
455 
456         return 0;
457 }
458 
459 /*
460  * Reads any 8-bit CP210X_ register identified by req.
461  */
462 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
463 {
464         return cp210x_read_reg_block(port, req, val, sizeof(*val));
465 }
466 
467 /*
468  * Writes any 16-bit CP210X_ register (req) whose value is passed
469  * entirely in the wValue field of the USB request.
470  */
471 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
472 {
473         struct usb_serial *serial = port->serial;
474         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
475         int result;
476 
477         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
478                         req, REQTYPE_HOST_TO_INTERFACE, val,
479                         port_priv->bInterfaceNumber, NULL, 0,
480                         USB_CTRL_SET_TIMEOUT);
481         if (result < 0) {
482                 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
483                                 req, result);
484         }
485 
486         return result;
487 }
488 
489 /*
490  * Writes a variable-sized block of CP210X_ registers, identified by req.
491  * Data in buf must be in native USB byte order.
492  */
493 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
494                 void *buf, int bufsize)
495 {
496         struct usb_serial *serial = port->serial;
497         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
498         void *dmabuf;
499         int result;
500 
501         dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
502         if (!dmabuf)
503                 return -ENOMEM;
504 
505         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
506                         req, REQTYPE_HOST_TO_INTERFACE, 0,
507                         port_priv->bInterfaceNumber, dmabuf, bufsize,
508                         USB_CTRL_SET_TIMEOUT);
509 
510         kfree(dmabuf);
511 
512         if (result == bufsize) {
513                 result = 0;
514         } else {
515                 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
516                                 req, bufsize, result);
517                 if (result >= 0)
518                         result = -EPROTO;
519         }
520 
521         return result;
522 }
523 
524 /*
525  * Writes any 32-bit CP210X_ register identified by req.
526  */
527 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
528 {
529         __le32 le32_val;
530 
531         le32_val = cpu_to_le32(val);
532 
533         return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
534 }
535 
536 /*
537  * Detect CP2108 GET_LINE_CTL bug and activate workaround.
538  * Write a known good value 0x800, read it back.
539  * If it comes back swapped the bug is detected.
540  * Preserve the original register value.
541  */
542 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
543 {
544         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
545         u16 line_ctl_save;
546         u16 line_ctl_test;
547         int err;
548 
549         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save);
550         if (err)
551                 return err;
552 
553         err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800);
554         if (err)
555                 return err;
556 
557         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test);
558         if (err)
559                 return err;
560 
561         if (line_ctl_test == 8) {
562                 port_priv->has_swapped_line_ctl = true;
563                 line_ctl_save = swab16(line_ctl_save);
564         }
565 
566         return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save);
567 }
568 
569 /*
570  * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL)
571  * to workaround cp2108 bug and get correct value.
572  */
573 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl)
574 {
575         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
576         int err;
577 
578         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl);
579         if (err)
580                 return err;
581 
582         /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
583         if (port_priv->has_swapped_line_ctl)
584                 *ctl = swab16(*ctl);
585 
586         return 0;
587 }
588 
589 /*
590  * cp210x_quantise_baudrate
591  * Quantises the baud rate as per AN205 Table 1
592  */
593 static unsigned int cp210x_quantise_baudrate(unsigned int baud)
594 {
595         if (baud <= 300)
596                 baud = 300;
597         else if (baud <= 600)      baud = 600;
598         else if (baud <= 1200)     baud = 1200;
599         else if (baud <= 1800)     baud = 1800;
600         else if (baud <= 2400)     baud = 2400;
601         else if (baud <= 4000)     baud = 4000;
602         else if (baud <= 4803)     baud = 4800;
603         else if (baud <= 7207)     baud = 7200;
604         else if (baud <= 9612)     baud = 9600;
605         else if (baud <= 14428)    baud = 14400;
606         else if (baud <= 16062)    baud = 16000;
607         else if (baud <= 19250)    baud = 19200;
608         else if (baud <= 28912)    baud = 28800;
609         else if (baud <= 38601)    baud = 38400;
610         else if (baud <= 51558)    baud = 51200;
611         else if (baud <= 56280)    baud = 56000;
612         else if (baud <= 58053)    baud = 57600;
613         else if (baud <= 64111)    baud = 64000;
614         else if (baud <= 77608)    baud = 76800;
615         else if (baud <= 117028)   baud = 115200;
616         else if (baud <= 129347)   baud = 128000;
617         else if (baud <= 156868)   baud = 153600;
618         else if (baud <= 237832)   baud = 230400;
619         else if (baud <= 254234)   baud = 250000;
620         else if (baud <= 273066)   baud = 256000;
621         else if (baud <= 491520)   baud = 460800;
622         else if (baud <= 567138)   baud = 500000;
623         else if (baud <= 670254)   baud = 576000;
624         else if (baud < 1000000)
625                 baud = 921600;
626         else if (baud > 2000000)
627                 baud = 2000000;
628         return baud;
629 }
630 
631 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
632 {
633         int result;
634 
635         result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
636         if (result) {
637                 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
638                 return result;
639         }
640 
641         /* Configure the termios structure */
642         cp210x_get_termios(tty, port);
643 
644         /* The baud rate must be initialised on cp2104 */
645         if (tty)
646                 cp210x_change_speed(tty, port, NULL);
647 
648         return usb_serial_generic_open(tty, port);
649 }
650 
651 static void cp210x_close(struct usb_serial_port *port)
652 {
653         usb_serial_generic_close(port);
654 
655         /* Clear both queues; cp2108 needs this to avoid an occasional hang */
656         cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
657 
658         cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
659 }
660 
661 /*
662  * Read how many bytes are waiting in the TX queue.
663  */
664 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
665                 u32 *count)
666 {
667         struct usb_serial *serial = port->serial;
668         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
669         struct cp210x_comm_status *sts;
670         int result;
671 
672         sts = kmalloc(sizeof(*sts), GFP_KERNEL);
673         if (!sts)
674                 return -ENOMEM;
675 
676         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
677                         CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
678                         0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
679                         USB_CTRL_GET_TIMEOUT);
680         if (result == sizeof(*sts)) {
681                 *count = le32_to_cpu(sts->ulAmountInOutQueue);
682                 result = 0;
683         } else {
684                 dev_err(&port->dev, "failed to get comm status: %d\n", result);
685                 if (result >= 0)
686                         result = -EPROTO;
687         }
688 
689         kfree(sts);
690 
691         return result;
692 }
693 
694 static bool cp210x_tx_empty(struct usb_serial_port *port)
695 {
696         int err;
697         u32 count;
698 
699         err = cp210x_get_tx_queue_byte_count(port, &count);
700         if (err)
701                 return true;
702 
703         return !count;
704 }
705 
706 /*
707  * cp210x_get_termios
708  * Reads the baud rate, data bits, parity, stop bits and flow control mode
709  * from the device, corrects any unsupported values, and configures the
710  * termios structure to reflect the state of the device
711  */
712 static void cp210x_get_termios(struct tty_struct *tty,
713         struct usb_serial_port *port)
714 {
715         unsigned int baud;
716 
717         if (tty) {
718                 cp210x_get_termios_port(tty->driver_data,
719                         &tty->termios.c_cflag, &baud);
720                 tty_encode_baud_rate(tty, baud, baud);
721         } else {
722                 unsigned int cflag;
723                 cflag = 0;
724                 cp210x_get_termios_port(port, &cflag, &baud);
725         }
726 }
727 
728 /*
729  * cp210x_get_termios_port
730  * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
731  */
732 static void cp210x_get_termios_port(struct usb_serial_port *port,
733         unsigned int *cflagp, unsigned int *baudp)
734 {
735         struct device *dev = &port->dev;
736         unsigned int cflag;
737         struct cp210x_flow_ctl flow_ctl;
738         u32 baud;
739         u16 bits;
740         u32 ctl_hs;
741 
742         cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud);
743 
744         dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
745         *baudp = baud;
746 
747         cflag = *cflagp;
748 
749         cp210x_get_line_ctl(port, &bits);
750         cflag &= ~CSIZE;
751         switch (bits & BITS_DATA_MASK) {
752         case BITS_DATA_5:
753                 dev_dbg(dev, "%s - data bits = 5\n", __func__);
754                 cflag |= CS5;
755                 break;
756         case BITS_DATA_6:
757                 dev_dbg(dev, "%s - data bits = 6\n", __func__);
758                 cflag |= CS6;
759                 break;
760         case BITS_DATA_7:
761                 dev_dbg(dev, "%s - data bits = 7\n", __func__);
762                 cflag |= CS7;
763                 break;
764         case BITS_DATA_8:
765                 dev_dbg(dev, "%s - data bits = 8\n", __func__);
766                 cflag |= CS8;
767                 break;
768         case BITS_DATA_9:
769                 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
770                 cflag |= CS8;
771                 bits &= ~BITS_DATA_MASK;
772                 bits |= BITS_DATA_8;
773                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
774                 break;
775         default:
776                 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
777                 cflag |= CS8;
778                 bits &= ~BITS_DATA_MASK;
779                 bits |= BITS_DATA_8;
780                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
781                 break;
782         }
783 
784         switch (bits & BITS_PARITY_MASK) {
785         case BITS_PARITY_NONE:
786                 dev_dbg(dev, "%s - parity = NONE\n", __func__);
787                 cflag &= ~PARENB;
788                 break;
789         case BITS_PARITY_ODD:
790                 dev_dbg(dev, "%s - parity = ODD\n", __func__);
791                 cflag |= (PARENB|PARODD);
792                 break;
793         case BITS_PARITY_EVEN:
794                 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
795                 cflag &= ~PARODD;
796                 cflag |= PARENB;
797                 break;
798         case BITS_PARITY_MARK:
799                 dev_dbg(dev, "%s - parity = MARK\n", __func__);
800                 cflag |= (PARENB|PARODD|CMSPAR);
801                 break;
802         case BITS_PARITY_SPACE:
803                 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
804                 cflag &= ~PARODD;
805                 cflag |= (PARENB|CMSPAR);
806                 break;
807         default:
808                 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
809                 cflag &= ~PARENB;
810                 bits &= ~BITS_PARITY_MASK;
811                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
812                 break;
813         }
814 
815         cflag &= ~CSTOPB;
816         switch (bits & BITS_STOP_MASK) {
817         case BITS_STOP_1:
818                 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
819                 break;
820         case BITS_STOP_1_5:
821                 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
822                 bits &= ~BITS_STOP_MASK;
823                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
824                 break;
825         case BITS_STOP_2:
826                 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
827                 cflag |= CSTOPB;
828                 break;
829         default:
830                 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
831                 bits &= ~BITS_STOP_MASK;
832                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
833                 break;
834         }
835 
836         cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
837                         sizeof(flow_ctl));
838         ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
839         if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) {
840                 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
841                 cflag |= CRTSCTS;
842         } else {
843                 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
844                 cflag &= ~CRTSCTS;
845         }
846 
847         *cflagp = cflag;
848 }
849 
850 /*
851  * CP2101 supports the following baud rates:
852  *
853  *      300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
854  *      38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
855  *
856  * CP2102 and CP2103 support the following additional rates:
857  *
858  *      4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
859  *      576000
860  *
861  * The device will map a requested rate to a supported one, but the result
862  * of requests for rates greater than 1053257 is undefined (see AN205).
863  *
864  * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
865  * respectively, with an error less than 1%. The actual rates are determined
866  * by
867  *
868  *      div = round(freq / (2 x prescale x request))
869  *      actual = freq / (2 x prescale x div)
870  *
871  * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
872  * or 1 otherwise.
873  * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
874  * otherwise.
875  */
876 static void cp210x_change_speed(struct tty_struct *tty,
877                 struct usb_serial_port *port, struct ktermios *old_termios)
878 {
879         u32 baud;
880 
881         baud = tty->termios.c_ospeed;
882 
883         /* This maps the requested rate to a rate valid on cp2102 or cp2103,
884          * or to an arbitrary rate in [1M,2M].
885          *
886          * NOTE: B0 is not implemented.
887          */
888         baud = cp210x_quantise_baudrate(baud);
889 
890         dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
891         if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
892                 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
893                 if (old_termios)
894                         baud = old_termios->c_ospeed;
895                 else
896                         baud = 9600;
897         }
898 
899         tty_encode_baud_rate(tty, baud, baud);
900 }
901 
902 static void cp210x_set_termios(struct tty_struct *tty,
903                 struct usb_serial_port *port, struct ktermios *old_termios)
904 {
905         struct device *dev = &port->dev;
906         unsigned int cflag, old_cflag;
907         u16 bits;
908 
909         cflag = tty->termios.c_cflag;
910         old_cflag = old_termios->c_cflag;
911 
912         if (tty->termios.c_ospeed != old_termios->c_ospeed)
913                 cp210x_change_speed(tty, port, old_termios);
914 
915         /* If the number of data bits is to be updated */
916         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
917                 cp210x_get_line_ctl(port, &bits);
918                 bits &= ~BITS_DATA_MASK;
919                 switch (cflag & CSIZE) {
920                 case CS5:
921                         bits |= BITS_DATA_5;
922                         dev_dbg(dev, "%s - data bits = 5\n", __func__);
923                         break;
924                 case CS6:
925                         bits |= BITS_DATA_6;
926                         dev_dbg(dev, "%s - data bits = 6\n", __func__);
927                         break;
928                 case CS7:
929                         bits |= BITS_DATA_7;
930                         dev_dbg(dev, "%s - data bits = 7\n", __func__);
931                         break;
932                 case CS8:
933                         bits |= BITS_DATA_8;
934                         dev_dbg(dev, "%s - data bits = 8\n", __func__);
935                         break;
936                 /*case CS9:
937                         bits |= BITS_DATA_9;
938                         dev_dbg(dev, "%s - data bits = 9\n", __func__);
939                         break;*/
940                 default:
941                         dev_dbg(dev, "cp210x driver does not support the number of bits requested, using 8 bit mode\n");
942                         bits |= BITS_DATA_8;
943                         break;
944                 }
945                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
946                         dev_dbg(dev, "Number of data bits requested not supported by device\n");
947         }
948 
949         if ((cflag     & (PARENB|PARODD|CMSPAR)) !=
950             (old_cflag & (PARENB|PARODD|CMSPAR))) {
951                 cp210x_get_line_ctl(port, &bits);
952                 bits &= ~BITS_PARITY_MASK;
953                 if (cflag & PARENB) {
954                         if (cflag & CMSPAR) {
955                                 if (cflag & PARODD) {
956                                         bits |= BITS_PARITY_MARK;
957                                         dev_dbg(dev, "%s - parity = MARK\n", __func__);
958                                 } else {
959                                         bits |= BITS_PARITY_SPACE;
960                                         dev_dbg(dev, "%s - parity = SPACE\n", __func__);
961                                 }
962                         } else {
963                                 if (cflag & PARODD) {
964                                         bits |= BITS_PARITY_ODD;
965                                         dev_dbg(dev, "%s - parity = ODD\n", __func__);
966                                 } else {
967                                         bits |= BITS_PARITY_EVEN;
968                                         dev_dbg(dev, "%s - parity = EVEN\n", __func__);
969                                 }
970                         }
971                 }
972                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
973                         dev_dbg(dev, "Parity mode not supported by device\n");
974         }
975 
976         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
977                 cp210x_get_line_ctl(port, &bits);
978                 bits &= ~BITS_STOP_MASK;
979                 if (cflag & CSTOPB) {
980                         bits |= BITS_STOP_2;
981                         dev_dbg(dev, "%s - stop bits = 2\n", __func__);
982                 } else {
983                         bits |= BITS_STOP_1;
984                         dev_dbg(dev, "%s - stop bits = 1\n", __func__);
985                 }
986                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
987                         dev_dbg(dev, "Number of stop bits requested not supported by device\n");
988         }
989 
990         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
991                 struct cp210x_flow_ctl flow_ctl;
992                 u32 ctl_hs;
993                 u32 flow_repl;
994 
995                 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
996                                 sizeof(flow_ctl));
997                 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
998                 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
999                 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1000                                 __func__, ctl_hs, flow_repl);
1001 
1002                 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1003                 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1004                 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1005                 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1006                 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE);
1007                 if (cflag & CRTSCTS) {
1008                         ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1009 
1010                         flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1011                         flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1012                                         CP210X_SERIAL_RTS_FLOW_CTL);
1013                         dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1014                 } else {
1015                         ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1016 
1017                         flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1018                         flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1019                                         CP210X_SERIAL_RTS_ACTIVE);
1020                         dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1021                 }
1022 
1023                 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1024                                 __func__, ctl_hs, flow_repl);
1025                 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1026                 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1027                 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1028                                 sizeof(flow_ctl));
1029         }
1030 
1031 }
1032 
1033 static int cp210x_tiocmset(struct tty_struct *tty,
1034                 unsigned int set, unsigned int clear)
1035 {
1036         struct usb_serial_port *port = tty->driver_data;
1037         return cp210x_tiocmset_port(port, set, clear);
1038 }
1039 
1040 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1041                 unsigned int set, unsigned int clear)
1042 {
1043         u16 control = 0;
1044 
1045         if (set & TIOCM_RTS) {
1046                 control |= CONTROL_RTS;
1047                 control |= CONTROL_WRITE_RTS;
1048         }
1049         if (set & TIOCM_DTR) {
1050                 control |= CONTROL_DTR;
1051                 control |= CONTROL_WRITE_DTR;
1052         }
1053         if (clear & TIOCM_RTS) {
1054                 control &= ~CONTROL_RTS;
1055                 control |= CONTROL_WRITE_RTS;
1056         }
1057         if (clear & TIOCM_DTR) {
1058                 control &= ~CONTROL_DTR;
1059                 control |= CONTROL_WRITE_DTR;
1060         }
1061 
1062         dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
1063 
1064         return cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1065 }
1066 
1067 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
1068 {
1069         if (on)
1070                 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
1071         else
1072                 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
1073 }
1074 
1075 static int cp210x_tiocmget(struct tty_struct *tty)
1076 {
1077         struct usb_serial_port *port = tty->driver_data;
1078         u8 control;
1079         int result;
1080 
1081         result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1082         if (result)
1083                 return result;
1084 
1085         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1086                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1087                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1088                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1089                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
1090                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
1091 
1092         dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
1093 
1094         return result;
1095 }
1096 
1097 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1098 {
1099         struct usb_serial_port *port = tty->driver_data;
1100         u16 state;
1101 
1102         if (break_state == 0)
1103                 state = BREAK_OFF;
1104         else
1105                 state = BREAK_ON;
1106         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1107                 state == BREAK_OFF ? "off" : "on");
1108         cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1109 }
1110 
1111 static int cp210x_port_probe(struct usb_serial_port *port)
1112 {
1113         struct usb_serial *serial = port->serial;
1114         struct usb_host_interface *cur_altsetting;
1115         struct cp210x_port_private *port_priv;
1116         int ret;
1117 
1118         port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1119         if (!port_priv)
1120                 return -ENOMEM;
1121 
1122         cur_altsetting = serial->interface->cur_altsetting;
1123         port_priv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber;
1124 
1125         usb_set_serial_port_data(port, port_priv);
1126 
1127         ret = cp210x_detect_swapped_line_ctl(port);
1128         if (ret) {
1129                 kfree(port_priv);
1130                 return ret;
1131         }
1132 
1133         return 0;
1134 }
1135 
1136 static int cp210x_port_remove(struct usb_serial_port *port)
1137 {
1138         struct cp210x_port_private *port_priv;
1139 
1140         port_priv = usb_get_serial_port_data(port);
1141         kfree(port_priv);
1142 
1143         return 0;
1144 }
1145 
1146 module_usb_serial_driver(serial_drivers, id_table);
1147 
1148 MODULE_DESCRIPTION(DRIVER_DESC);
1149 MODULE_LICENSE("GPL");
1150 

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