Version:  2.0.40 2.2.26 2.4.37 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6

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 /*
335  * Reads a variable-sized block of CP210X_ registers, identified by req.
336  * Returns data into buf in native USB byte order.
337  */
338 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
339                 void *buf, int bufsize)
340 {
341         struct usb_serial *serial = port->serial;
342         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
343         void *dmabuf;
344         int result;
345 
346         dmabuf = kmalloc(bufsize, GFP_KERNEL);
347         if (!dmabuf) {
348                 /*
349                  * FIXME Some callers don't bother to check for error,
350                  * at least give them consistent junk until they are fixed
351                  */
352                 memset(buf, 0, bufsize);
353                 return -ENOMEM;
354         }
355 
356         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
357                         req, REQTYPE_INTERFACE_TO_HOST, 0,
358                         port_priv->bInterfaceNumber, dmabuf, bufsize,
359                         USB_CTRL_SET_TIMEOUT);
360         if (result == bufsize) {
361                 memcpy(buf, dmabuf, bufsize);
362                 result = 0;
363         } else {
364                 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
365                                 req, bufsize, result);
366                 if (result >= 0)
367                         result = -EPROTO;
368 
369                 /*
370                  * FIXME Some callers don't bother to check for error,
371                  * at least give them consistent junk until they are fixed
372                  */
373                 memset(buf, 0, bufsize);
374         }
375 
376         kfree(dmabuf);
377 
378         return result;
379 }
380 
381 /*
382  * Reads any 32-bit CP210X_ register identified by req.
383  */
384 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val)
385 {
386         __le32 le32_val;
387         int err;
388 
389         err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val));
390         if (err) {
391                 /*
392                  * FIXME Some callers don't bother to check for error,
393                  * at least give them consistent junk until they are fixed
394                  */
395                 *val = 0;
396                 return err;
397         }
398 
399         *val = le32_to_cpu(le32_val);
400 
401         return 0;
402 }
403 
404 /*
405  * Reads any 16-bit CP210X_ register identified by req.
406  */
407 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val)
408 {
409         __le16 le16_val;
410         int err;
411 
412         err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val));
413         if (err)
414                 return err;
415 
416         *val = le16_to_cpu(le16_val);
417 
418         return 0;
419 }
420 
421 /*
422  * Reads any 8-bit CP210X_ register identified by req.
423  */
424 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
425 {
426         return cp210x_read_reg_block(port, req, val, sizeof(*val));
427 }
428 
429 /*
430  * Writes any 16-bit CP210X_ register (req) whose value is passed
431  * entirely in the wValue field of the USB request.
432  */
433 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
434 {
435         struct usb_serial *serial = port->serial;
436         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
437         int result;
438 
439         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
440                         req, REQTYPE_HOST_TO_INTERFACE, val,
441                         port_priv->bInterfaceNumber, NULL, 0,
442                         USB_CTRL_SET_TIMEOUT);
443         if (result < 0) {
444                 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
445                                 req, result);
446         }
447 
448         return result;
449 }
450 
451 /*
452  * Writes a variable-sized block of CP210X_ registers, identified by req.
453  * Data in buf must be in native USB byte order.
454  */
455 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
456                 void *buf, int bufsize)
457 {
458         struct usb_serial *serial = port->serial;
459         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
460         void *dmabuf;
461         int result;
462 
463         dmabuf = kmalloc(bufsize, GFP_KERNEL);
464         if (!dmabuf)
465                 return -ENOMEM;
466 
467         memcpy(dmabuf, buf, bufsize);
468 
469         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
470                         req, REQTYPE_HOST_TO_INTERFACE, 0,
471                         port_priv->bInterfaceNumber, dmabuf, bufsize,
472                         USB_CTRL_SET_TIMEOUT);
473 
474         kfree(dmabuf);
475 
476         if (result == bufsize) {
477                 result = 0;
478         } else {
479                 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
480                                 req, bufsize, result);
481                 if (result >= 0)
482                         result = -EPROTO;
483         }
484 
485         return result;
486 }
487 
488 /*
489  * Writes any 32-bit CP210X_ register identified by req.
490  */
491 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
492 {
493         __le32 le32_val;
494 
495         le32_val = cpu_to_le32(val);
496 
497         return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
498 }
499 
500 /*
501  * Detect CP2108 GET_LINE_CTL bug and activate workaround.
502  * Write a known good value 0x800, read it back.
503  * If it comes back swapped the bug is detected.
504  * Preserve the original register value.
505  */
506 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
507 {
508         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
509         u16 line_ctl_save;
510         u16 line_ctl_test;
511         int err;
512 
513         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save);
514         if (err)
515                 return err;
516 
517         err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800);
518         if (err)
519                 return err;
520 
521         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test);
522         if (err)
523                 return err;
524 
525         if (line_ctl_test == 8) {
526                 port_priv->has_swapped_line_ctl = true;
527                 line_ctl_save = swab16(line_ctl_save);
528         }
529 
530         return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save);
531 }
532 
533 /*
534  * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL)
535  * to workaround cp2108 bug and get correct value.
536  */
537 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl)
538 {
539         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
540         int err;
541 
542         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl);
543         if (err)
544                 return err;
545 
546         /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
547         if (port_priv->has_swapped_line_ctl)
548                 *ctl = swab16(*ctl);
549 
550         return 0;
551 }
552 
553 /*
554  * cp210x_quantise_baudrate
555  * Quantises the baud rate as per AN205 Table 1
556  */
557 static unsigned int cp210x_quantise_baudrate(unsigned int baud)
558 {
559         if (baud <= 300)
560                 baud = 300;
561         else if (baud <= 600)      baud = 600;
562         else if (baud <= 1200)     baud = 1200;
563         else if (baud <= 1800)     baud = 1800;
564         else if (baud <= 2400)     baud = 2400;
565         else if (baud <= 4000)     baud = 4000;
566         else if (baud <= 4803)     baud = 4800;
567         else if (baud <= 7207)     baud = 7200;
568         else if (baud <= 9612)     baud = 9600;
569         else if (baud <= 14428)    baud = 14400;
570         else if (baud <= 16062)    baud = 16000;
571         else if (baud <= 19250)    baud = 19200;
572         else if (baud <= 28912)    baud = 28800;
573         else if (baud <= 38601)    baud = 38400;
574         else if (baud <= 51558)    baud = 51200;
575         else if (baud <= 56280)    baud = 56000;
576         else if (baud <= 58053)    baud = 57600;
577         else if (baud <= 64111)    baud = 64000;
578         else if (baud <= 77608)    baud = 76800;
579         else if (baud <= 117028)   baud = 115200;
580         else if (baud <= 129347)   baud = 128000;
581         else if (baud <= 156868)   baud = 153600;
582         else if (baud <= 237832)   baud = 230400;
583         else if (baud <= 254234)   baud = 250000;
584         else if (baud <= 273066)   baud = 256000;
585         else if (baud <= 491520)   baud = 460800;
586         else if (baud <= 567138)   baud = 500000;
587         else if (baud <= 670254)   baud = 576000;
588         else if (baud < 1000000)
589                 baud = 921600;
590         else if (baud > 2000000)
591                 baud = 2000000;
592         return baud;
593 }
594 
595 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
596 {
597         int result;
598 
599         result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
600         if (result) {
601                 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
602                 return result;
603         }
604 
605         /* Configure the termios structure */
606         cp210x_get_termios(tty, port);
607 
608         /* The baud rate must be initialised on cp2104 */
609         if (tty)
610                 cp210x_change_speed(tty, port, NULL);
611 
612         return usb_serial_generic_open(tty, port);
613 }
614 
615 static void cp210x_close(struct usb_serial_port *port)
616 {
617         usb_serial_generic_close(port);
618 
619         /* Clear both queues; cp2108 needs this to avoid an occasional hang */
620         cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
621 
622         cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
623 }
624 
625 /*
626  * Read how many bytes are waiting in the TX queue.
627  */
628 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
629                 u32 *count)
630 {
631         struct usb_serial *serial = port->serial;
632         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
633         struct cp210x_comm_status *sts;
634         int result;
635 
636         sts = kmalloc(sizeof(*sts), GFP_KERNEL);
637         if (!sts)
638                 return -ENOMEM;
639 
640         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
641                         CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
642                         0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
643                         USB_CTRL_GET_TIMEOUT);
644         if (result == sizeof(*sts)) {
645                 *count = le32_to_cpu(sts->ulAmountInOutQueue);
646                 result = 0;
647         } else {
648                 dev_err(&port->dev, "failed to get comm status: %d\n", result);
649                 if (result >= 0)
650                         result = -EPROTO;
651         }
652 
653         kfree(sts);
654 
655         return result;
656 }
657 
658 static bool cp210x_tx_empty(struct usb_serial_port *port)
659 {
660         int err;
661         u32 count;
662 
663         err = cp210x_get_tx_queue_byte_count(port, &count);
664         if (err)
665                 return true;
666 
667         return !count;
668 }
669 
670 /*
671  * cp210x_get_termios
672  * Reads the baud rate, data bits, parity, stop bits and flow control mode
673  * from the device, corrects any unsupported values, and configures the
674  * termios structure to reflect the state of the device
675  */
676 static void cp210x_get_termios(struct tty_struct *tty,
677         struct usb_serial_port *port)
678 {
679         unsigned int baud;
680 
681         if (tty) {
682                 cp210x_get_termios_port(tty->driver_data,
683                         &tty->termios.c_cflag, &baud);
684                 tty_encode_baud_rate(tty, baud, baud);
685         } else {
686                 unsigned int cflag;
687                 cflag = 0;
688                 cp210x_get_termios_port(port, &cflag, &baud);
689         }
690 }
691 
692 /*
693  * cp210x_get_termios_port
694  * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
695  */
696 static void cp210x_get_termios_port(struct usb_serial_port *port,
697         unsigned int *cflagp, unsigned int *baudp)
698 {
699         struct device *dev = &port->dev;
700         unsigned int cflag;
701         u8 modem_ctl[16];
702         u32 baud;
703         u16 bits;
704 
705         cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud);
706 
707         dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
708         *baudp = baud;
709 
710         cflag = *cflagp;
711 
712         cp210x_get_line_ctl(port, &bits);
713         cflag &= ~CSIZE;
714         switch (bits & BITS_DATA_MASK) {
715         case BITS_DATA_5:
716                 dev_dbg(dev, "%s - data bits = 5\n", __func__);
717                 cflag |= CS5;
718                 break;
719         case BITS_DATA_6:
720                 dev_dbg(dev, "%s - data bits = 6\n", __func__);
721                 cflag |= CS6;
722                 break;
723         case BITS_DATA_7:
724                 dev_dbg(dev, "%s - data bits = 7\n", __func__);
725                 cflag |= CS7;
726                 break;
727         case BITS_DATA_8:
728                 dev_dbg(dev, "%s - data bits = 8\n", __func__);
729                 cflag |= CS8;
730                 break;
731         case BITS_DATA_9:
732                 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
733                 cflag |= CS8;
734                 bits &= ~BITS_DATA_MASK;
735                 bits |= BITS_DATA_8;
736                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
737                 break;
738         default:
739                 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
740                 cflag |= CS8;
741                 bits &= ~BITS_DATA_MASK;
742                 bits |= BITS_DATA_8;
743                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
744                 break;
745         }
746 
747         switch (bits & BITS_PARITY_MASK) {
748         case BITS_PARITY_NONE:
749                 dev_dbg(dev, "%s - parity = NONE\n", __func__);
750                 cflag &= ~PARENB;
751                 break;
752         case BITS_PARITY_ODD:
753                 dev_dbg(dev, "%s - parity = ODD\n", __func__);
754                 cflag |= (PARENB|PARODD);
755                 break;
756         case BITS_PARITY_EVEN:
757                 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
758                 cflag &= ~PARODD;
759                 cflag |= PARENB;
760                 break;
761         case BITS_PARITY_MARK:
762                 dev_dbg(dev, "%s - parity = MARK\n", __func__);
763                 cflag |= (PARENB|PARODD|CMSPAR);
764                 break;
765         case BITS_PARITY_SPACE:
766                 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
767                 cflag &= ~PARODD;
768                 cflag |= (PARENB|CMSPAR);
769                 break;
770         default:
771                 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
772                 cflag &= ~PARENB;
773                 bits &= ~BITS_PARITY_MASK;
774                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
775                 break;
776         }
777 
778         cflag &= ~CSTOPB;
779         switch (bits & BITS_STOP_MASK) {
780         case BITS_STOP_1:
781                 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
782                 break;
783         case BITS_STOP_1_5:
784                 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
785                 bits &= ~BITS_STOP_MASK;
786                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
787                 break;
788         case BITS_STOP_2:
789                 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
790                 cflag |= CSTOPB;
791                 break;
792         default:
793                 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
794                 bits &= ~BITS_STOP_MASK;
795                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
796                 break;
797         }
798 
799         cp210x_read_reg_block(port, CP210X_GET_FLOW, modem_ctl,
800                         sizeof(modem_ctl));
801         if (modem_ctl[0] & 0x08) {
802                 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
803                 cflag |= CRTSCTS;
804         } else {
805                 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
806                 cflag &= ~CRTSCTS;
807         }
808 
809         *cflagp = cflag;
810 }
811 
812 /*
813  * CP2101 supports the following baud rates:
814  *
815  *      300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
816  *      38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
817  *
818  * CP2102 and CP2103 support the following additional rates:
819  *
820  *      4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
821  *      576000
822  *
823  * The device will map a requested rate to a supported one, but the result
824  * of requests for rates greater than 1053257 is undefined (see AN205).
825  *
826  * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
827  * respectively, with an error less than 1%. The actual rates are determined
828  * by
829  *
830  *      div = round(freq / (2 x prescale x request))
831  *      actual = freq / (2 x prescale x div)
832  *
833  * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
834  * or 1 otherwise.
835  * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
836  * otherwise.
837  */
838 static void cp210x_change_speed(struct tty_struct *tty,
839                 struct usb_serial_port *port, struct ktermios *old_termios)
840 {
841         u32 baud;
842 
843         baud = tty->termios.c_ospeed;
844 
845         /* This maps the requested rate to a rate valid on cp2102 or cp2103,
846          * or to an arbitrary rate in [1M,2M].
847          *
848          * NOTE: B0 is not implemented.
849          */
850         baud = cp210x_quantise_baudrate(baud);
851 
852         dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
853         if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
854                 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
855                 if (old_termios)
856                         baud = old_termios->c_ospeed;
857                 else
858                         baud = 9600;
859         }
860 
861         tty_encode_baud_rate(tty, baud, baud);
862 }
863 
864 static void cp210x_set_termios(struct tty_struct *tty,
865                 struct usb_serial_port *port, struct ktermios *old_termios)
866 {
867         struct device *dev = &port->dev;
868         unsigned int cflag, old_cflag;
869         u16 bits;
870         u8 modem_ctl[16];
871 
872         cflag = tty->termios.c_cflag;
873         old_cflag = old_termios->c_cflag;
874 
875         if (tty->termios.c_ospeed != old_termios->c_ospeed)
876                 cp210x_change_speed(tty, port, old_termios);
877 
878         /* If the number of data bits is to be updated */
879         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
880                 cp210x_get_line_ctl(port, &bits);
881                 bits &= ~BITS_DATA_MASK;
882                 switch (cflag & CSIZE) {
883                 case CS5:
884                         bits |= BITS_DATA_5;
885                         dev_dbg(dev, "%s - data bits = 5\n", __func__);
886                         break;
887                 case CS6:
888                         bits |= BITS_DATA_6;
889                         dev_dbg(dev, "%s - data bits = 6\n", __func__);
890                         break;
891                 case CS7:
892                         bits |= BITS_DATA_7;
893                         dev_dbg(dev, "%s - data bits = 7\n", __func__);
894                         break;
895                 case CS8:
896                         bits |= BITS_DATA_8;
897                         dev_dbg(dev, "%s - data bits = 8\n", __func__);
898                         break;
899                 /*case CS9:
900                         bits |= BITS_DATA_9;
901                         dev_dbg(dev, "%s - data bits = 9\n", __func__);
902                         break;*/
903                 default:
904                         dev_dbg(dev, "cp210x driver does not support the number of bits requested, using 8 bit mode\n");
905                         bits |= BITS_DATA_8;
906                         break;
907                 }
908                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
909                         dev_dbg(dev, "Number of data bits requested not supported by device\n");
910         }
911 
912         if ((cflag     & (PARENB|PARODD|CMSPAR)) !=
913             (old_cflag & (PARENB|PARODD|CMSPAR))) {
914                 cp210x_get_line_ctl(port, &bits);
915                 bits &= ~BITS_PARITY_MASK;
916                 if (cflag & PARENB) {
917                         if (cflag & CMSPAR) {
918                                 if (cflag & PARODD) {
919                                         bits |= BITS_PARITY_MARK;
920                                         dev_dbg(dev, "%s - parity = MARK\n", __func__);
921                                 } else {
922                                         bits |= BITS_PARITY_SPACE;
923                                         dev_dbg(dev, "%s - parity = SPACE\n", __func__);
924                                 }
925                         } else {
926                                 if (cflag & PARODD) {
927                                         bits |= BITS_PARITY_ODD;
928                                         dev_dbg(dev, "%s - parity = ODD\n", __func__);
929                                 } else {
930                                         bits |= BITS_PARITY_EVEN;
931                                         dev_dbg(dev, "%s - parity = EVEN\n", __func__);
932                                 }
933                         }
934                 }
935                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
936                         dev_dbg(dev, "Parity mode not supported by device\n");
937         }
938 
939         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
940                 cp210x_get_line_ctl(port, &bits);
941                 bits &= ~BITS_STOP_MASK;
942                 if (cflag & CSTOPB) {
943                         bits |= BITS_STOP_2;
944                         dev_dbg(dev, "%s - stop bits = 2\n", __func__);
945                 } else {
946                         bits |= BITS_STOP_1;
947                         dev_dbg(dev, "%s - stop bits = 1\n", __func__);
948                 }
949                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
950                         dev_dbg(dev, "Number of stop bits requested not supported by device\n");
951         }
952 
953         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
954 
955                 /* Only bytes 0, 4 and 7 out of first 8 have functional bits */
956 
957                 cp210x_read_reg_block(port, CP210X_GET_FLOW, modem_ctl,
958                                 sizeof(modem_ctl));
959                 dev_dbg(dev, "%s - read modem controls = %02x .. .. .. %02x .. .. %02x\n",
960                         __func__, modem_ctl[0], modem_ctl[4], modem_ctl[7]);
961 
962                 if (cflag & CRTSCTS) {
963                         modem_ctl[0] &= ~0x7B;
964                         modem_ctl[0] |= 0x09;
965                         modem_ctl[4] = 0x80;
966                         /* FIXME - why clear reserved bits just read? */
967                         modem_ctl[5] = 0;
968                         modem_ctl[6] = 0;
969                         modem_ctl[7] = 0;
970                         dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
971                 } else {
972                         modem_ctl[0] &= ~0x7B;
973                         modem_ctl[0] |= 0x01;
974                         /* FIXME - OR here instead of assignment looks wrong */
975                         modem_ctl[4] |= 0x40;
976                         dev_dbg(dev, "%s - flow control = NONE\n", __func__);
977                 }
978 
979                 dev_dbg(dev, "%s - write modem controls = %02x .. .. .. %02x .. .. %02x\n",
980                         __func__, modem_ctl[0], modem_ctl[4], modem_ctl[7]);
981                 cp210x_write_reg_block(port, CP210X_SET_FLOW, modem_ctl,
982                                 sizeof(modem_ctl));
983         }
984 
985 }
986 
987 static int cp210x_tiocmset(struct tty_struct *tty,
988                 unsigned int set, unsigned int clear)
989 {
990         struct usb_serial_port *port = tty->driver_data;
991         return cp210x_tiocmset_port(port, set, clear);
992 }
993 
994 static int cp210x_tiocmset_port(struct usb_serial_port *port,
995                 unsigned int set, unsigned int clear)
996 {
997         u16 control = 0;
998 
999         if (set & TIOCM_RTS) {
1000                 control |= CONTROL_RTS;
1001                 control |= CONTROL_WRITE_RTS;
1002         }
1003         if (set & TIOCM_DTR) {
1004                 control |= CONTROL_DTR;
1005                 control |= CONTROL_WRITE_DTR;
1006         }
1007         if (clear & TIOCM_RTS) {
1008                 control &= ~CONTROL_RTS;
1009                 control |= CONTROL_WRITE_RTS;
1010         }
1011         if (clear & TIOCM_DTR) {
1012                 control &= ~CONTROL_DTR;
1013                 control |= CONTROL_WRITE_DTR;
1014         }
1015 
1016         dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
1017 
1018         return cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1019 }
1020 
1021 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
1022 {
1023         if (on)
1024                 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
1025         else
1026                 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
1027 }
1028 
1029 static int cp210x_tiocmget(struct tty_struct *tty)
1030 {
1031         struct usb_serial_port *port = tty->driver_data;
1032         u8 control;
1033         int result;
1034 
1035         cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1036 
1037         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1038                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1039                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1040                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1041                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
1042                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
1043 
1044         dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
1045 
1046         return result;
1047 }
1048 
1049 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1050 {
1051         struct usb_serial_port *port = tty->driver_data;
1052         u16 state;
1053 
1054         if (break_state == 0)
1055                 state = BREAK_OFF;
1056         else
1057                 state = BREAK_ON;
1058         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1059                 state == BREAK_OFF ? "off" : "on");
1060         cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1061 }
1062 
1063 static int cp210x_port_probe(struct usb_serial_port *port)
1064 {
1065         struct usb_serial *serial = port->serial;
1066         struct usb_host_interface *cur_altsetting;
1067         struct cp210x_port_private *port_priv;
1068         int ret;
1069 
1070         port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1071         if (!port_priv)
1072                 return -ENOMEM;
1073 
1074         cur_altsetting = serial->interface->cur_altsetting;
1075         port_priv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber;
1076 
1077         usb_set_serial_port_data(port, port_priv);
1078 
1079         ret = cp210x_detect_swapped_line_ctl(port);
1080         if (ret) {
1081                 kfree(port_priv);
1082                 return ret;
1083         }
1084 
1085         return 0;
1086 }
1087 
1088 static int cp210x_port_remove(struct usb_serial_port *port)
1089 {
1090         struct cp210x_port_private *port_priv;
1091 
1092         port_priv = usb_get_serial_port_data(port);
1093         kfree(port_priv);
1094 
1095         return 0;
1096 }
1097 
1098 module_usb_serial_driver(serial_drivers, id_table);
1099 
1100 MODULE_DESCRIPTION(DRIVER_DESC);
1101 MODULE_LICENSE("GPL");
1102 

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