Version:  2.0.40 2.2.26 2.4.37 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0

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 int cp210x_tiocmget(struct tty_struct *);
 42 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
 43 static int cp210x_tiocmset_port(struct usb_serial_port *port,
 44                 unsigned int, unsigned int);
 45 static void cp210x_break_ctl(struct tty_struct *, int);
 46 static int cp210x_startup(struct usb_serial *);
 47 static void cp210x_release(struct usb_serial *);
 48 static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
 49 
 50 static const struct usb_device_id id_table[] = {
 51         { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */
 52         { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
 53         { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
 54         { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
 55         { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
 56         { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */
 57         { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
 58         { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
 59         { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */
 60         { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
 61         { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
 62         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
 63         { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
 64         { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
 65         { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */
 66         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
 67         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
 68         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
 69         { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
 70         { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
 71         { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
 72         { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
 73         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
 74         { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
 75         { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
 76         { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
 77         { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
 78         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
 79         { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
 80         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
 81         { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
 82         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
 83         { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
 84         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
 85         { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
 86         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
 87         { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
 88         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
 89         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
 90         { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
 91         { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
 92         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
 93         { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
 94         { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
 95         { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
 96         { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
 97         { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
 98         { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
 99         { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
100         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
101         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
102         { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
103         { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
104         { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
105         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
106         { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
107         { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
108         { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */
109         { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
110         { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
111         { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
112         { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
113         { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
114         { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
115         { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
116         { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
117         { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
118         { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
119         { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
120         { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
121         { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
122         { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
123         { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
124         { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
125         { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
126         { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
127         { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
128         { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
129         { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
130         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
131         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
132         { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
133         { USB_DEVICE(0x10C4, 0xEA80) }, /* Silicon Labs factory default */
134         { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
135         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
136         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
137         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
138         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
139         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
140         { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
141         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
142         { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
143         { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
144         { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
145         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
146         { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
147         { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
148         { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
149         { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
150         { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
151         { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
152         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
153         { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
154         { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
155         { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
156         { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
157         { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
158         { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
159         { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
160         { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
161         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
162         { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
163         { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
164         { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
165         { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
166         { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
167         { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
168         { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
169         { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
170         { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
171         { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
172         { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
173         { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
174         { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
175         { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
176         { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
177         { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
178         { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
179         { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
180         { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
181         { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
182         { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
183         { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
184         { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
185         { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
186         { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
187         { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
188         { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
189         { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
190         { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
191         { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
192         { } /* Terminating Entry */
193 };
194 
195 MODULE_DEVICE_TABLE(usb, id_table);
196 
197 struct cp210x_serial_private {
198         __u8                    bInterfaceNumber;
199 };
200 
201 static struct usb_serial_driver cp210x_device = {
202         .driver = {
203                 .owner =        THIS_MODULE,
204                 .name =         "cp210x",
205         },
206         .id_table               = id_table,
207         .num_ports              = 1,
208         .bulk_in_size           = 256,
209         .bulk_out_size          = 256,
210         .open                   = cp210x_open,
211         .close                  = cp210x_close,
212         .break_ctl              = cp210x_break_ctl,
213         .set_termios            = cp210x_set_termios,
214         .tiocmget               = cp210x_tiocmget,
215         .tiocmset               = cp210x_tiocmset,
216         .attach                 = cp210x_startup,
217         .release                = cp210x_release,
218         .dtr_rts                = cp210x_dtr_rts
219 };
220 
221 static struct usb_serial_driver * const serial_drivers[] = {
222         &cp210x_device, NULL
223 };
224 
225 /* Config request types */
226 #define REQTYPE_HOST_TO_INTERFACE       0x41
227 #define REQTYPE_INTERFACE_TO_HOST       0xc1
228 #define REQTYPE_HOST_TO_DEVICE  0x40
229 #define REQTYPE_DEVICE_TO_HOST  0xc0
230 
231 /* Config request codes */
232 #define CP210X_IFC_ENABLE       0x00
233 #define CP210X_SET_BAUDDIV      0x01
234 #define CP210X_GET_BAUDDIV      0x02
235 #define CP210X_SET_LINE_CTL     0x03
236 #define CP210X_GET_LINE_CTL     0x04
237 #define CP210X_SET_BREAK        0x05
238 #define CP210X_IMM_CHAR         0x06
239 #define CP210X_SET_MHS          0x07
240 #define CP210X_GET_MDMSTS       0x08
241 #define CP210X_SET_XON          0x09
242 #define CP210X_SET_XOFF         0x0A
243 #define CP210X_SET_EVENTMASK    0x0B
244 #define CP210X_GET_EVENTMASK    0x0C
245 #define CP210X_SET_CHAR         0x0D
246 #define CP210X_GET_CHARS        0x0E
247 #define CP210X_GET_PROPS        0x0F
248 #define CP210X_GET_COMM_STATUS  0x10
249 #define CP210X_RESET            0x11
250 #define CP210X_PURGE            0x12
251 #define CP210X_SET_FLOW         0x13
252 #define CP210X_GET_FLOW         0x14
253 #define CP210X_EMBED_EVENTS     0x15
254 #define CP210X_GET_EVENTSTATE   0x16
255 #define CP210X_SET_CHARS        0x19
256 #define CP210X_GET_BAUDRATE     0x1D
257 #define CP210X_SET_BAUDRATE     0x1E
258 
259 /* CP210X_IFC_ENABLE */
260 #define UART_ENABLE             0x0001
261 #define UART_DISABLE            0x0000
262 
263 /* CP210X_(SET|GET)_BAUDDIV */
264 #define BAUD_RATE_GEN_FREQ      0x384000
265 
266 /* CP210X_(SET|GET)_LINE_CTL */
267 #define BITS_DATA_MASK          0X0f00
268 #define BITS_DATA_5             0X0500
269 #define BITS_DATA_6             0X0600
270 #define BITS_DATA_7             0X0700
271 #define BITS_DATA_8             0X0800
272 #define BITS_DATA_9             0X0900
273 
274 #define BITS_PARITY_MASK        0x00f0
275 #define BITS_PARITY_NONE        0x0000
276 #define BITS_PARITY_ODD         0x0010
277 #define BITS_PARITY_EVEN        0x0020
278 #define BITS_PARITY_MARK        0x0030
279 #define BITS_PARITY_SPACE       0x0040
280 
281 #define BITS_STOP_MASK          0x000f
282 #define BITS_STOP_1             0x0000
283 #define BITS_STOP_1_5           0x0001
284 #define BITS_STOP_2             0x0002
285 
286 /* CP210X_SET_BREAK */
287 #define BREAK_ON                0x0001
288 #define BREAK_OFF               0x0000
289 
290 /* CP210X_(SET_MHS|GET_MDMSTS) */
291 #define CONTROL_DTR             0x0001
292 #define CONTROL_RTS             0x0002
293 #define CONTROL_CTS             0x0010
294 #define CONTROL_DSR             0x0020
295 #define CONTROL_RING            0x0040
296 #define CONTROL_DCD             0x0080
297 #define CONTROL_WRITE_DTR       0x0100
298 #define CONTROL_WRITE_RTS       0x0200
299 
300 /*
301  * cp210x_get_config
302  * Reads from the CP210x configuration registers
303  * 'size' is specified in bytes.
304  * 'data' is a pointer to a pre-allocated array of integers large
305  * enough to hold 'size' bytes (with 4 bytes to each integer)
306  */
307 static int cp210x_get_config(struct usb_serial_port *port, u8 request,
308                 unsigned int *data, int size)
309 {
310         struct usb_serial *serial = port->serial;
311         struct cp210x_serial_private *spriv = usb_get_serial_data(serial);
312         __le32 *buf;
313         int result, i, length;
314 
315         /* Number of integers required to contain the array */
316         length = (((size - 1) | 3) + 1) / 4;
317 
318         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
319         if (!buf)
320                 return -ENOMEM;
321 
322         /* Issue the request, attempting to read 'size' bytes */
323         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
324                                 request, REQTYPE_INTERFACE_TO_HOST, 0x0000,
325                                 spriv->bInterfaceNumber, buf, size,
326                                 USB_CTRL_GET_TIMEOUT);
327 
328         /* Convert data into an array of integers */
329         for (i = 0; i < length; i++)
330                 data[i] = le32_to_cpu(buf[i]);
331 
332         kfree(buf);
333 
334         if (result != size) {
335                 dev_dbg(&port->dev, "%s - Unable to send config request, request=0x%x size=%d result=%d\n",
336                         __func__, request, size, result);
337                 if (result > 0)
338                         result = -EPROTO;
339 
340                 return result;
341         }
342 
343         return 0;
344 }
345 
346 /*
347  * cp210x_set_config
348  * Writes to the CP210x configuration registers
349  * Values less than 16 bits wide are sent directly
350  * 'size' is specified in bytes.
351  */
352 static int cp210x_set_config(struct usb_serial_port *port, u8 request,
353                 unsigned int *data, int size)
354 {
355         struct usb_serial *serial = port->serial;
356         struct cp210x_serial_private *spriv = usb_get_serial_data(serial);
357         __le32 *buf;
358         int result, i, length;
359 
360         /* Number of integers required to contain the array */
361         length = (((size - 1) | 3) + 1) / 4;
362 
363         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
364         if (!buf)
365                 return -ENOMEM;
366 
367         /* Array of integers into bytes */
368         for (i = 0; i < length; i++)
369                 buf[i] = cpu_to_le32(data[i]);
370 
371         if (size > 2) {
372                 result = usb_control_msg(serial->dev,
373                                 usb_sndctrlpipe(serial->dev, 0),
374                                 request, REQTYPE_HOST_TO_INTERFACE, 0x0000,
375                                 spriv->bInterfaceNumber, buf, size,
376                                 USB_CTRL_SET_TIMEOUT);
377         } else {
378                 result = usb_control_msg(serial->dev,
379                                 usb_sndctrlpipe(serial->dev, 0),
380                                 request, REQTYPE_HOST_TO_INTERFACE, data[0],
381                                 spriv->bInterfaceNumber, NULL, 0,
382                                 USB_CTRL_SET_TIMEOUT);
383         }
384 
385         kfree(buf);
386 
387         if ((size > 2 && result != size) || result < 0) {
388                 dev_dbg(&port->dev, "%s - Unable to send request, request=0x%x size=%d result=%d\n",
389                         __func__, request, size, result);
390                 if (result > 0)
391                         result = -EPROTO;
392 
393                 return result;
394         }
395 
396         return 0;
397 }
398 
399 /*
400  * cp210x_set_config_single
401  * Convenience function for calling cp210x_set_config on single data values
402  * without requiring an integer pointer
403  */
404 static inline int cp210x_set_config_single(struct usb_serial_port *port,
405                 u8 request, unsigned int data)
406 {
407         return cp210x_set_config(port, request, &data, 2);
408 }
409 
410 /*
411  * cp210x_quantise_baudrate
412  * Quantises the baud rate as per AN205 Table 1
413  */
414 static unsigned int cp210x_quantise_baudrate(unsigned int baud)
415 {
416         if (baud <= 300)
417                 baud = 300;
418         else if (baud <= 600)      baud = 600;
419         else if (baud <= 1200)     baud = 1200;
420         else if (baud <= 1800)     baud = 1800;
421         else if (baud <= 2400)     baud = 2400;
422         else if (baud <= 4000)     baud = 4000;
423         else if (baud <= 4803)     baud = 4800;
424         else if (baud <= 7207)     baud = 7200;
425         else if (baud <= 9612)     baud = 9600;
426         else if (baud <= 14428)    baud = 14400;
427         else if (baud <= 16062)    baud = 16000;
428         else if (baud <= 19250)    baud = 19200;
429         else if (baud <= 28912)    baud = 28800;
430         else if (baud <= 38601)    baud = 38400;
431         else if (baud <= 51558)    baud = 51200;
432         else if (baud <= 56280)    baud = 56000;
433         else if (baud <= 58053)    baud = 57600;
434         else if (baud <= 64111)    baud = 64000;
435         else if (baud <= 77608)    baud = 76800;
436         else if (baud <= 117028)   baud = 115200;
437         else if (baud <= 129347)   baud = 128000;
438         else if (baud <= 156868)   baud = 153600;
439         else if (baud <= 237832)   baud = 230400;
440         else if (baud <= 254234)   baud = 250000;
441         else if (baud <= 273066)   baud = 256000;
442         else if (baud <= 491520)   baud = 460800;
443         else if (baud <= 567138)   baud = 500000;
444         else if (baud <= 670254)   baud = 576000;
445         else if (baud < 1000000)
446                 baud = 921600;
447         else if (baud > 2000000)
448                 baud = 2000000;
449         return baud;
450 }
451 
452 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
453 {
454         int result;
455 
456         result = cp210x_set_config_single(port, CP210X_IFC_ENABLE,
457                                                                 UART_ENABLE);
458         if (result) {
459                 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
460                 return result;
461         }
462 
463         /* Configure the termios structure */
464         cp210x_get_termios(tty, port);
465 
466         /* The baud rate must be initialised on cp2104 */
467         if (tty)
468                 cp210x_change_speed(tty, port, NULL);
469 
470         return usb_serial_generic_open(tty, port);
471 }
472 
473 static void cp210x_close(struct usb_serial_port *port)
474 {
475         usb_serial_generic_close(port);
476         cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE);
477 }
478 
479 /*
480  * cp210x_get_termios
481  * Reads the baud rate, data bits, parity, stop bits and flow control mode
482  * from the device, corrects any unsupported values, and configures the
483  * termios structure to reflect the state of the device
484  */
485 static void cp210x_get_termios(struct tty_struct *tty,
486         struct usb_serial_port *port)
487 {
488         unsigned int baud;
489 
490         if (tty) {
491                 cp210x_get_termios_port(tty->driver_data,
492                         &tty->termios.c_cflag, &baud);
493                 tty_encode_baud_rate(tty, baud, baud);
494         } else {
495                 unsigned int cflag;
496                 cflag = 0;
497                 cp210x_get_termios_port(port, &cflag, &baud);
498         }
499 }
500 
501 /*
502  * cp210x_get_termios_port
503  * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
504  */
505 static void cp210x_get_termios_port(struct usb_serial_port *port,
506         unsigned int *cflagp, unsigned int *baudp)
507 {
508         struct device *dev = &port->dev;
509         unsigned int cflag, modem_ctl[4];
510         unsigned int baud;
511         unsigned int bits;
512 
513         cp210x_get_config(port, CP210X_GET_BAUDRATE, &baud, 4);
514 
515         dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
516         *baudp = baud;
517 
518         cflag = *cflagp;
519 
520         cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
521         cflag &= ~CSIZE;
522         switch (bits & BITS_DATA_MASK) {
523         case BITS_DATA_5:
524                 dev_dbg(dev, "%s - data bits = 5\n", __func__);
525                 cflag |= CS5;
526                 break;
527         case BITS_DATA_6:
528                 dev_dbg(dev, "%s - data bits = 6\n", __func__);
529                 cflag |= CS6;
530                 break;
531         case BITS_DATA_7:
532                 dev_dbg(dev, "%s - data bits = 7\n", __func__);
533                 cflag |= CS7;
534                 break;
535         case BITS_DATA_8:
536                 dev_dbg(dev, "%s - data bits = 8\n", __func__);
537                 cflag |= CS8;
538                 break;
539         case BITS_DATA_9:
540                 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
541                 cflag |= CS8;
542                 bits &= ~BITS_DATA_MASK;
543                 bits |= BITS_DATA_8;
544                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
545                 break;
546         default:
547                 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
548                 cflag |= CS8;
549                 bits &= ~BITS_DATA_MASK;
550                 bits |= BITS_DATA_8;
551                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
552                 break;
553         }
554 
555         switch (bits & BITS_PARITY_MASK) {
556         case BITS_PARITY_NONE:
557                 dev_dbg(dev, "%s - parity = NONE\n", __func__);
558                 cflag &= ~PARENB;
559                 break;
560         case BITS_PARITY_ODD:
561                 dev_dbg(dev, "%s - parity = ODD\n", __func__);
562                 cflag |= (PARENB|PARODD);
563                 break;
564         case BITS_PARITY_EVEN:
565                 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
566                 cflag &= ~PARODD;
567                 cflag |= PARENB;
568                 break;
569         case BITS_PARITY_MARK:
570                 dev_dbg(dev, "%s - parity = MARK\n", __func__);
571                 cflag |= (PARENB|PARODD|CMSPAR);
572                 break;
573         case BITS_PARITY_SPACE:
574                 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
575                 cflag &= ~PARODD;
576                 cflag |= (PARENB|CMSPAR);
577                 break;
578         default:
579                 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
580                 cflag &= ~PARENB;
581                 bits &= ~BITS_PARITY_MASK;
582                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
583                 break;
584         }
585 
586         cflag &= ~CSTOPB;
587         switch (bits & BITS_STOP_MASK) {
588         case BITS_STOP_1:
589                 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
590                 break;
591         case BITS_STOP_1_5:
592                 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
593                 bits &= ~BITS_STOP_MASK;
594                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
595                 break;
596         case BITS_STOP_2:
597                 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
598                 cflag |= CSTOPB;
599                 break;
600         default:
601                 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
602                 bits &= ~BITS_STOP_MASK;
603                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
604                 break;
605         }
606 
607         cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
608         if (modem_ctl[0] & 0x0008) {
609                 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
610                 cflag |= CRTSCTS;
611         } else {
612                 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
613                 cflag &= ~CRTSCTS;
614         }
615 
616         *cflagp = cflag;
617 }
618 
619 /*
620  * CP2101 supports the following baud rates:
621  *
622  *      300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
623  *      38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
624  *
625  * CP2102 and CP2103 support the following additional rates:
626  *
627  *      4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
628  *      576000
629  *
630  * The device will map a requested rate to a supported one, but the result
631  * of requests for rates greater than 1053257 is undefined (see AN205).
632  *
633  * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
634  * respectively, with an error less than 1%. The actual rates are determined
635  * by
636  *
637  *      div = round(freq / (2 x prescale x request))
638  *      actual = freq / (2 x prescale x div)
639  *
640  * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
641  * or 1 otherwise.
642  * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
643  * otherwise.
644  */
645 static void cp210x_change_speed(struct tty_struct *tty,
646                 struct usb_serial_port *port, struct ktermios *old_termios)
647 {
648         u32 baud;
649 
650         baud = tty->termios.c_ospeed;
651 
652         /* This maps the requested rate to a rate valid on cp2102 or cp2103,
653          * or to an arbitrary rate in [1M,2M].
654          *
655          * NOTE: B0 is not implemented.
656          */
657         baud = cp210x_quantise_baudrate(baud);
658 
659         dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
660         if (cp210x_set_config(port, CP210X_SET_BAUDRATE, &baud,
661                                                         sizeof(baud))) {
662                 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
663                 if (old_termios)
664                         baud = old_termios->c_ospeed;
665                 else
666                         baud = 9600;
667         }
668 
669         tty_encode_baud_rate(tty, baud, baud);
670 }
671 
672 static void cp210x_set_termios(struct tty_struct *tty,
673                 struct usb_serial_port *port, struct ktermios *old_termios)
674 {
675         struct device *dev = &port->dev;
676         unsigned int cflag, old_cflag;
677         unsigned int bits;
678         unsigned int modem_ctl[4];
679 
680         cflag = tty->termios.c_cflag;
681         old_cflag = old_termios->c_cflag;
682 
683         if (tty->termios.c_ospeed != old_termios->c_ospeed)
684                 cp210x_change_speed(tty, port, old_termios);
685 
686         /* If the number of data bits is to be updated */
687         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
688                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
689                 bits &= ~BITS_DATA_MASK;
690                 switch (cflag & CSIZE) {
691                 case CS5:
692                         bits |= BITS_DATA_5;
693                         dev_dbg(dev, "%s - data bits = 5\n", __func__);
694                         break;
695                 case CS6:
696                         bits |= BITS_DATA_6;
697                         dev_dbg(dev, "%s - data bits = 6\n", __func__);
698                         break;
699                 case CS7:
700                         bits |= BITS_DATA_7;
701                         dev_dbg(dev, "%s - data bits = 7\n", __func__);
702                         break;
703                 case CS8:
704                         bits |= BITS_DATA_8;
705                         dev_dbg(dev, "%s - data bits = 8\n", __func__);
706                         break;
707                 /*case CS9:
708                         bits |= BITS_DATA_9;
709                         dev_dbg(dev, "%s - data bits = 9\n", __func__);
710                         break;*/
711                 default:
712                         dev_dbg(dev, "cp210x driver does not support the number of bits requested, using 8 bit mode\n");
713                         bits |= BITS_DATA_8;
714                         break;
715                 }
716                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
717                         dev_dbg(dev, "Number of data bits requested not supported by device\n");
718         }
719 
720         if ((cflag     & (PARENB|PARODD|CMSPAR)) !=
721             (old_cflag & (PARENB|PARODD|CMSPAR))) {
722                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
723                 bits &= ~BITS_PARITY_MASK;
724                 if (cflag & PARENB) {
725                         if (cflag & CMSPAR) {
726                                 if (cflag & PARODD) {
727                                         bits |= BITS_PARITY_MARK;
728                                         dev_dbg(dev, "%s - parity = MARK\n", __func__);
729                                 } else {
730                                         bits |= BITS_PARITY_SPACE;
731                                         dev_dbg(dev, "%s - parity = SPACE\n", __func__);
732                                 }
733                         } else {
734                                 if (cflag & PARODD) {
735                                         bits |= BITS_PARITY_ODD;
736                                         dev_dbg(dev, "%s - parity = ODD\n", __func__);
737                                 } else {
738                                         bits |= BITS_PARITY_EVEN;
739                                         dev_dbg(dev, "%s - parity = EVEN\n", __func__);
740                                 }
741                         }
742                 }
743                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
744                         dev_dbg(dev, "Parity mode not supported by device\n");
745         }
746 
747         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
748                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
749                 bits &= ~BITS_STOP_MASK;
750                 if (cflag & CSTOPB) {
751                         bits |= BITS_STOP_2;
752                         dev_dbg(dev, "%s - stop bits = 2\n", __func__);
753                 } else {
754                         bits |= BITS_STOP_1;
755                         dev_dbg(dev, "%s - stop bits = 1\n", __func__);
756                 }
757                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
758                         dev_dbg(dev, "Number of stop bits requested not supported by device\n");
759         }
760 
761         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
762                 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
763                 dev_dbg(dev, "%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n",
764                         __func__, modem_ctl[0], modem_ctl[1],
765                         modem_ctl[2], modem_ctl[3]);
766 
767                 if (cflag & CRTSCTS) {
768                         modem_ctl[0] &= ~0x7B;
769                         modem_ctl[0] |= 0x09;
770                         modem_ctl[1] = 0x80;
771                         dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
772                 } else {
773                         modem_ctl[0] &= ~0x7B;
774                         modem_ctl[0] |= 0x01;
775                         modem_ctl[1] |= 0x40;
776                         dev_dbg(dev, "%s - flow control = NONE\n", __func__);
777                 }
778 
779                 dev_dbg(dev, "%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n",
780                         __func__, modem_ctl[0], modem_ctl[1],
781                         modem_ctl[2], modem_ctl[3]);
782                 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16);
783         }
784 
785 }
786 
787 static int cp210x_tiocmset(struct tty_struct *tty,
788                 unsigned int set, unsigned int clear)
789 {
790         struct usb_serial_port *port = tty->driver_data;
791         return cp210x_tiocmset_port(port, set, clear);
792 }
793 
794 static int cp210x_tiocmset_port(struct usb_serial_port *port,
795                 unsigned int set, unsigned int clear)
796 {
797         unsigned int control = 0;
798 
799         if (set & TIOCM_RTS) {
800                 control |= CONTROL_RTS;
801                 control |= CONTROL_WRITE_RTS;
802         }
803         if (set & TIOCM_DTR) {
804                 control |= CONTROL_DTR;
805                 control |= CONTROL_WRITE_DTR;
806         }
807         if (clear & TIOCM_RTS) {
808                 control &= ~CONTROL_RTS;
809                 control |= CONTROL_WRITE_RTS;
810         }
811         if (clear & TIOCM_DTR) {
812                 control &= ~CONTROL_DTR;
813                 control |= CONTROL_WRITE_DTR;
814         }
815 
816         dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
817 
818         return cp210x_set_config(port, CP210X_SET_MHS, &control, 2);
819 }
820 
821 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
822 {
823         if (on)
824                 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
825         else
826                 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
827 }
828 
829 static int cp210x_tiocmget(struct tty_struct *tty)
830 {
831         struct usb_serial_port *port = tty->driver_data;
832         unsigned int control;
833         int result;
834 
835         cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1);
836 
837         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
838                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
839                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
840                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
841                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
842                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
843 
844         dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
845 
846         return result;
847 }
848 
849 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
850 {
851         struct usb_serial_port *port = tty->driver_data;
852         unsigned int state;
853 
854         if (break_state == 0)
855                 state = BREAK_OFF;
856         else
857                 state = BREAK_ON;
858         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
859                 state == BREAK_OFF ? "off" : "on");
860         cp210x_set_config(port, CP210X_SET_BREAK, &state, 2);
861 }
862 
863 static int cp210x_startup(struct usb_serial *serial)
864 {
865         struct usb_host_interface *cur_altsetting;
866         struct cp210x_serial_private *spriv;
867 
868         spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
869         if (!spriv)
870                 return -ENOMEM;
871 
872         cur_altsetting = serial->interface->cur_altsetting;
873         spriv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber;
874 
875         usb_set_serial_data(serial, spriv);
876 
877         return 0;
878 }
879 
880 static void cp210x_release(struct usb_serial *serial)
881 {
882         struct cp210x_serial_private *spriv;
883 
884         spriv = usb_get_serial_data(serial);
885         kfree(spriv);
886 }
887 
888 module_usb_serial_driver(serial_drivers, id_table);
889 
890 MODULE_DESCRIPTION(DRIVER_DESC);
891 MODULE_LICENSE("GPL");
892 

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