Version:  2.0.40 2.2.26 2.4.37 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15

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

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