Version:  2.0.40 2.2.26 2.4.37 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 3.16 3.17 3.18

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, 0x8875) }, /* CEL MeshConnect USB Stick */
124         { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
125         { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
126         { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
127         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
128         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
129         { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
130         { USB_DEVICE(0x10C4, 0xEA80) }, /* Silicon Labs factory default */
131         { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
132         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
133         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
134         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
135         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
136         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
137         { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
138         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
139         { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
140         { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
141         { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
142         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
143         { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
144         { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
145         { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
146         { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
147         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
148         { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
149         { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
150         { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
151         { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
152         { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
153         { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
154         { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
155         { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
156         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
157         { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
158         { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
159         { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
160         { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
161         { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
162         { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
163         { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
164         { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
165         { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
166         { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
167         { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
168         { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
169         { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
170         { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
171         { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
172         { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
173         { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
174         { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
175         { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
176         { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
177         { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
178         { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
179         { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
180         { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
181         { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
182         { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
183         { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
184         { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
185         { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
186         { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
187         { } /* Terminating Entry */
188 };
189 
190 MODULE_DEVICE_TABLE(usb, id_table);
191 
192 struct cp210x_serial_private {
193         __u8                    bInterfaceNumber;
194 };
195 
196 static struct usb_serial_driver cp210x_device = {
197         .driver = {
198                 .owner =        THIS_MODULE,
199                 .name =         "cp210x",
200         },
201         .id_table               = id_table,
202         .num_ports              = 1,
203         .bulk_in_size           = 256,
204         .bulk_out_size          = 256,
205         .open                   = cp210x_open,
206         .close                  = cp210x_close,
207         .break_ctl              = cp210x_break_ctl,
208         .set_termios            = cp210x_set_termios,
209         .tiocmget               = cp210x_tiocmget,
210         .tiocmset               = cp210x_tiocmset,
211         .attach                 = cp210x_startup,
212         .release                = cp210x_release,
213         .dtr_rts                = cp210x_dtr_rts
214 };
215 
216 static struct usb_serial_driver * const serial_drivers[] = {
217         &cp210x_device, NULL
218 };
219 
220 /* Config request types */
221 #define REQTYPE_HOST_TO_INTERFACE       0x41
222 #define REQTYPE_INTERFACE_TO_HOST       0xc1
223 #define REQTYPE_HOST_TO_DEVICE  0x40
224 #define REQTYPE_DEVICE_TO_HOST  0xc0
225 
226 /* Config request codes */
227 #define CP210X_IFC_ENABLE       0x00
228 #define CP210X_SET_BAUDDIV      0x01
229 #define CP210X_GET_BAUDDIV      0x02
230 #define CP210X_SET_LINE_CTL     0x03
231 #define CP210X_GET_LINE_CTL     0x04
232 #define CP210X_SET_BREAK        0x05
233 #define CP210X_IMM_CHAR         0x06
234 #define CP210X_SET_MHS          0x07
235 #define CP210X_GET_MDMSTS       0x08
236 #define CP210X_SET_XON          0x09
237 #define CP210X_SET_XOFF         0x0A
238 #define CP210X_SET_EVENTMASK    0x0B
239 #define CP210X_GET_EVENTMASK    0x0C
240 #define CP210X_SET_CHAR         0x0D
241 #define CP210X_GET_CHARS        0x0E
242 #define CP210X_GET_PROPS        0x0F
243 #define CP210X_GET_COMM_STATUS  0x10
244 #define CP210X_RESET            0x11
245 #define CP210X_PURGE            0x12
246 #define CP210X_SET_FLOW         0x13
247 #define CP210X_GET_FLOW         0x14
248 #define CP210X_EMBED_EVENTS     0x15
249 #define CP210X_GET_EVENTSTATE   0x16
250 #define CP210X_SET_CHARS        0x19
251 #define CP210X_GET_BAUDRATE     0x1D
252 #define CP210X_SET_BAUDRATE     0x1E
253 
254 /* CP210X_IFC_ENABLE */
255 #define UART_ENABLE             0x0001
256 #define UART_DISABLE            0x0000
257 
258 /* CP210X_(SET|GET)_BAUDDIV */
259 #define BAUD_RATE_GEN_FREQ      0x384000
260 
261 /* CP210X_(SET|GET)_LINE_CTL */
262 #define BITS_DATA_MASK          0X0f00
263 #define BITS_DATA_5             0X0500
264 #define BITS_DATA_6             0X0600
265 #define BITS_DATA_7             0X0700
266 #define BITS_DATA_8             0X0800
267 #define BITS_DATA_9             0X0900
268 
269 #define BITS_PARITY_MASK        0x00f0
270 #define BITS_PARITY_NONE        0x0000
271 #define BITS_PARITY_ODD         0x0010
272 #define BITS_PARITY_EVEN        0x0020
273 #define BITS_PARITY_MARK        0x0030
274 #define BITS_PARITY_SPACE       0x0040
275 
276 #define BITS_STOP_MASK          0x000f
277 #define BITS_STOP_1             0x0000
278 #define BITS_STOP_1_5           0x0001
279 #define BITS_STOP_2             0x0002
280 
281 /* CP210X_SET_BREAK */
282 #define BREAK_ON                0x0001
283 #define BREAK_OFF               0x0000
284 
285 /* CP210X_(SET_MHS|GET_MDMSTS) */
286 #define CONTROL_DTR             0x0001
287 #define CONTROL_RTS             0x0002
288 #define CONTROL_CTS             0x0010
289 #define CONTROL_DSR             0x0020
290 #define CONTROL_RING            0x0040
291 #define CONTROL_DCD             0x0080
292 #define CONTROL_WRITE_DTR       0x0100
293 #define CONTROL_WRITE_RTS       0x0200
294 
295 /*
296  * cp210x_get_config
297  * Reads from the CP210x configuration registers
298  * 'size' is specified in bytes.
299  * 'data' is a pointer to a pre-allocated array of integers large
300  * enough to hold 'size' bytes (with 4 bytes to each integer)
301  */
302 static int cp210x_get_config(struct usb_serial_port *port, u8 request,
303                 unsigned int *data, int size)
304 {
305         struct usb_serial *serial = port->serial;
306         struct cp210x_serial_private *spriv = usb_get_serial_data(serial);
307         __le32 *buf;
308         int result, i, length;
309 
310         /* Number of integers required to contain the array */
311         length = (((size - 1) | 3) + 1) / 4;
312 
313         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
314         if (!buf)
315                 return -ENOMEM;
316 
317         /* Issue the request, attempting to read 'size' bytes */
318         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
319                                 request, REQTYPE_INTERFACE_TO_HOST, 0x0000,
320                                 spriv->bInterfaceNumber, buf, size,
321                                 USB_CTRL_GET_TIMEOUT);
322 
323         /* Convert data into an array of integers */
324         for (i = 0; i < length; i++)
325                 data[i] = le32_to_cpu(buf[i]);
326 
327         kfree(buf);
328 
329         if (result != size) {
330                 dev_dbg(&port->dev, "%s - Unable to send config request, request=0x%x size=%d result=%d\n",
331                         __func__, request, size, result);
332                 if (result > 0)
333                         result = -EPROTO;
334 
335                 return result;
336         }
337 
338         return 0;
339 }
340 
341 /*
342  * cp210x_set_config
343  * Writes to the CP210x configuration registers
344  * Values less than 16 bits wide are sent directly
345  * 'size' is specified in bytes.
346  */
347 static int cp210x_set_config(struct usb_serial_port *port, u8 request,
348                 unsigned int *data, int size)
349 {
350         struct usb_serial *serial = port->serial;
351         struct cp210x_serial_private *spriv = usb_get_serial_data(serial);
352         __le32 *buf;
353         int result, i, length;
354 
355         /* Number of integers required to contain the array */
356         length = (((size - 1) | 3) + 1) / 4;
357 
358         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
359         if (!buf)
360                 return -ENOMEM;
361 
362         /* Array of integers into bytes */
363         for (i = 0; i < length; i++)
364                 buf[i] = cpu_to_le32(data[i]);
365 
366         if (size > 2) {
367                 result = usb_control_msg(serial->dev,
368                                 usb_sndctrlpipe(serial->dev, 0),
369                                 request, REQTYPE_HOST_TO_INTERFACE, 0x0000,
370                                 spriv->bInterfaceNumber, buf, size,
371                                 USB_CTRL_SET_TIMEOUT);
372         } else {
373                 result = usb_control_msg(serial->dev,
374                                 usb_sndctrlpipe(serial->dev, 0),
375                                 request, REQTYPE_HOST_TO_INTERFACE, data[0],
376                                 spriv->bInterfaceNumber, NULL, 0,
377                                 USB_CTRL_SET_TIMEOUT);
378         }
379 
380         kfree(buf);
381 
382         if ((size > 2 && result != size) || result < 0) {
383                 dev_dbg(&port->dev, "%s - Unable to send request, request=0x%x size=%d result=%d\n",
384                         __func__, request, size, result);
385                 if (result > 0)
386                         result = -EPROTO;
387 
388                 return result;
389         }
390 
391         return 0;
392 }
393 
394 /*
395  * cp210x_set_config_single
396  * Convenience function for calling cp210x_set_config on single data values
397  * without requiring an integer pointer
398  */
399 static inline int cp210x_set_config_single(struct usb_serial_port *port,
400                 u8 request, unsigned int data)
401 {
402         return cp210x_set_config(port, request, &data, 2);
403 }
404 
405 /*
406  * cp210x_quantise_baudrate
407  * Quantises the baud rate as per AN205 Table 1
408  */
409 static unsigned int cp210x_quantise_baudrate(unsigned int baud)
410 {
411         if (baud <= 300)
412                 baud = 300;
413         else if (baud <= 600)      baud = 600;
414         else if (baud <= 1200)     baud = 1200;
415         else if (baud <= 1800)     baud = 1800;
416         else if (baud <= 2400)     baud = 2400;
417         else if (baud <= 4000)     baud = 4000;
418         else if (baud <= 4803)     baud = 4800;
419         else if (baud <= 7207)     baud = 7200;
420         else if (baud <= 9612)     baud = 9600;
421         else if (baud <= 14428)    baud = 14400;
422         else if (baud <= 16062)    baud = 16000;
423         else if (baud <= 19250)    baud = 19200;
424         else if (baud <= 28912)    baud = 28800;
425         else if (baud <= 38601)    baud = 38400;
426         else if (baud <= 51558)    baud = 51200;
427         else if (baud <= 56280)    baud = 56000;
428         else if (baud <= 58053)    baud = 57600;
429         else if (baud <= 64111)    baud = 64000;
430         else if (baud <= 77608)    baud = 76800;
431         else if (baud <= 117028)   baud = 115200;
432         else if (baud <= 129347)   baud = 128000;
433         else if (baud <= 156868)   baud = 153600;
434         else if (baud <= 237832)   baud = 230400;
435         else if (baud <= 254234)   baud = 250000;
436         else if (baud <= 273066)   baud = 256000;
437         else if (baud <= 491520)   baud = 460800;
438         else if (baud <= 567138)   baud = 500000;
439         else if (baud <= 670254)   baud = 576000;
440         else if (baud < 1000000)
441                 baud = 921600;
442         else if (baud > 2000000)
443                 baud = 2000000;
444         return baud;
445 }
446 
447 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
448 {
449         int result;
450 
451         result = cp210x_set_config_single(port, CP210X_IFC_ENABLE,
452                                                                 UART_ENABLE);
453         if (result) {
454                 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
455                 return result;
456         }
457 
458         /* Configure the termios structure */
459         cp210x_get_termios(tty, port);
460 
461         /* The baud rate must be initialised on cp2104 */
462         if (tty)
463                 cp210x_change_speed(tty, port, NULL);
464 
465         return usb_serial_generic_open(tty, port);
466 }
467 
468 static void cp210x_close(struct usb_serial_port *port)
469 {
470         usb_serial_generic_close(port);
471         cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE);
472 }
473 
474 /*
475  * cp210x_get_termios
476  * Reads the baud rate, data bits, parity, stop bits and flow control mode
477  * from the device, corrects any unsupported values, and configures the
478  * termios structure to reflect the state of the device
479  */
480 static void cp210x_get_termios(struct tty_struct *tty,
481         struct usb_serial_port *port)
482 {
483         unsigned int baud;
484 
485         if (tty) {
486                 cp210x_get_termios_port(tty->driver_data,
487                         &tty->termios.c_cflag, &baud);
488                 tty_encode_baud_rate(tty, baud, baud);
489         } else {
490                 unsigned int cflag;
491                 cflag = 0;
492                 cp210x_get_termios_port(port, &cflag, &baud);
493         }
494 }
495 
496 /*
497  * cp210x_get_termios_port
498  * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
499  */
500 static void cp210x_get_termios_port(struct usb_serial_port *port,
501         unsigned int *cflagp, unsigned int *baudp)
502 {
503         struct device *dev = &port->dev;
504         unsigned int cflag, modem_ctl[4];
505         unsigned int baud;
506         unsigned int bits;
507 
508         cp210x_get_config(port, CP210X_GET_BAUDRATE, &baud, 4);
509 
510         dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
511         *baudp = baud;
512 
513         cflag = *cflagp;
514 
515         cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
516         cflag &= ~CSIZE;
517         switch (bits & BITS_DATA_MASK) {
518         case BITS_DATA_5:
519                 dev_dbg(dev, "%s - data bits = 5\n", __func__);
520                 cflag |= CS5;
521                 break;
522         case BITS_DATA_6:
523                 dev_dbg(dev, "%s - data bits = 6\n", __func__);
524                 cflag |= CS6;
525                 break;
526         case BITS_DATA_7:
527                 dev_dbg(dev, "%s - data bits = 7\n", __func__);
528                 cflag |= CS7;
529                 break;
530         case BITS_DATA_8:
531                 dev_dbg(dev, "%s - data bits = 8\n", __func__);
532                 cflag |= CS8;
533                 break;
534         case BITS_DATA_9:
535                 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
536                 cflag |= CS8;
537                 bits &= ~BITS_DATA_MASK;
538                 bits |= BITS_DATA_8;
539                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
540                 break;
541         default:
542                 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
543                 cflag |= CS8;
544                 bits &= ~BITS_DATA_MASK;
545                 bits |= BITS_DATA_8;
546                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
547                 break;
548         }
549 
550         switch (bits & BITS_PARITY_MASK) {
551         case BITS_PARITY_NONE:
552                 dev_dbg(dev, "%s - parity = NONE\n", __func__);
553                 cflag &= ~PARENB;
554                 break;
555         case BITS_PARITY_ODD:
556                 dev_dbg(dev, "%s - parity = ODD\n", __func__);
557                 cflag |= (PARENB|PARODD);
558                 break;
559         case BITS_PARITY_EVEN:
560                 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
561                 cflag &= ~PARODD;
562                 cflag |= PARENB;
563                 break;
564         case BITS_PARITY_MARK:
565                 dev_dbg(dev, "%s - parity = MARK\n", __func__);
566                 cflag |= (PARENB|PARODD|CMSPAR);
567                 break;
568         case BITS_PARITY_SPACE:
569                 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
570                 cflag &= ~PARODD;
571                 cflag |= (PARENB|CMSPAR);
572                 break;
573         default:
574                 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
575                 cflag &= ~PARENB;
576                 bits &= ~BITS_PARITY_MASK;
577                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
578                 break;
579         }
580 
581         cflag &= ~CSTOPB;
582         switch (bits & BITS_STOP_MASK) {
583         case BITS_STOP_1:
584                 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
585                 break;
586         case BITS_STOP_1_5:
587                 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
588                 bits &= ~BITS_STOP_MASK;
589                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
590                 break;
591         case BITS_STOP_2:
592                 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
593                 cflag |= CSTOPB;
594                 break;
595         default:
596                 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
597                 bits &= ~BITS_STOP_MASK;
598                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
599                 break;
600         }
601 
602         cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
603         if (modem_ctl[0] & 0x0008) {
604                 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
605                 cflag |= CRTSCTS;
606         } else {
607                 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
608                 cflag &= ~CRTSCTS;
609         }
610 
611         *cflagp = cflag;
612 }
613 
614 /*
615  * CP2101 supports the following baud rates:
616  *
617  *      300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
618  *      38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
619  *
620  * CP2102 and CP2103 support the following additional rates:
621  *
622  *      4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
623  *      576000
624  *
625  * The device will map a requested rate to a supported one, but the result
626  * of requests for rates greater than 1053257 is undefined (see AN205).
627  *
628  * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
629  * respectively, with an error less than 1%. The actual rates are determined
630  * by
631  *
632  *      div = round(freq / (2 x prescale x request))
633  *      actual = freq / (2 x prescale x div)
634  *
635  * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
636  * or 1 otherwise.
637  * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
638  * otherwise.
639  */
640 static void cp210x_change_speed(struct tty_struct *tty,
641                 struct usb_serial_port *port, struct ktermios *old_termios)
642 {
643         u32 baud;
644 
645         baud = tty->termios.c_ospeed;
646 
647         /* This maps the requested rate to a rate valid on cp2102 or cp2103,
648          * or to an arbitrary rate in [1M,2M].
649          *
650          * NOTE: B0 is not implemented.
651          */
652         baud = cp210x_quantise_baudrate(baud);
653 
654         dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
655         if (cp210x_set_config(port, CP210X_SET_BAUDRATE, &baud,
656                                                         sizeof(baud))) {
657                 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
658                 if (old_termios)
659                         baud = old_termios->c_ospeed;
660                 else
661                         baud = 9600;
662         }
663 
664         tty_encode_baud_rate(tty, baud, baud);
665 }
666 
667 static void cp210x_set_termios(struct tty_struct *tty,
668                 struct usb_serial_port *port, struct ktermios *old_termios)
669 {
670         struct device *dev = &port->dev;
671         unsigned int cflag, old_cflag;
672         unsigned int bits;
673         unsigned int modem_ctl[4];
674 
675         cflag = tty->termios.c_cflag;
676         old_cflag = old_termios->c_cflag;
677 
678         if (tty->termios.c_ospeed != old_termios->c_ospeed)
679                 cp210x_change_speed(tty, port, old_termios);
680 
681         /* If the number of data bits is to be updated */
682         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
683                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
684                 bits &= ~BITS_DATA_MASK;
685                 switch (cflag & CSIZE) {
686                 case CS5:
687                         bits |= BITS_DATA_5;
688                         dev_dbg(dev, "%s - data bits = 5\n", __func__);
689                         break;
690                 case CS6:
691                         bits |= BITS_DATA_6;
692                         dev_dbg(dev, "%s - data bits = 6\n", __func__);
693                         break;
694                 case CS7:
695                         bits |= BITS_DATA_7;
696                         dev_dbg(dev, "%s - data bits = 7\n", __func__);
697                         break;
698                 case CS8:
699                         bits |= BITS_DATA_8;
700                         dev_dbg(dev, "%s - data bits = 8\n", __func__);
701                         break;
702                 /*case CS9:
703                         bits |= BITS_DATA_9;
704                         dev_dbg(dev, "%s - data bits = 9\n", __func__);
705                         break;*/
706                 default:
707                         dev_dbg(dev, "cp210x driver does not support the number of bits requested, using 8 bit mode\n");
708                         bits |= BITS_DATA_8;
709                         break;
710                 }
711                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
712                         dev_dbg(dev, "Number of data bits requested not supported by device\n");
713         }
714 
715         if ((cflag     & (PARENB|PARODD|CMSPAR)) !=
716             (old_cflag & (PARENB|PARODD|CMSPAR))) {
717                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
718                 bits &= ~BITS_PARITY_MASK;
719                 if (cflag & PARENB) {
720                         if (cflag & CMSPAR) {
721                                 if (cflag & PARODD) {
722                                         bits |= BITS_PARITY_MARK;
723                                         dev_dbg(dev, "%s - parity = MARK\n", __func__);
724                                 } else {
725                                         bits |= BITS_PARITY_SPACE;
726                                         dev_dbg(dev, "%s - parity = SPACE\n", __func__);
727                                 }
728                         } else {
729                                 if (cflag & PARODD) {
730                                         bits |= BITS_PARITY_ODD;
731                                         dev_dbg(dev, "%s - parity = ODD\n", __func__);
732                                 } else {
733                                         bits |= BITS_PARITY_EVEN;
734                                         dev_dbg(dev, "%s - parity = EVEN\n", __func__);
735                                 }
736                         }
737                 }
738                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
739                         dev_dbg(dev, "Parity mode not supported by device\n");
740         }
741 
742         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
743                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
744                 bits &= ~BITS_STOP_MASK;
745                 if (cflag & CSTOPB) {
746                         bits |= BITS_STOP_2;
747                         dev_dbg(dev, "%s - stop bits = 2\n", __func__);
748                 } else {
749                         bits |= BITS_STOP_1;
750                         dev_dbg(dev, "%s - stop bits = 1\n", __func__);
751                 }
752                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
753                         dev_dbg(dev, "Number of stop bits requested not supported by device\n");
754         }
755 
756         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
757                 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
758                 dev_dbg(dev, "%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n",
759                         __func__, modem_ctl[0], modem_ctl[1],
760                         modem_ctl[2], modem_ctl[3]);
761 
762                 if (cflag & CRTSCTS) {
763                         modem_ctl[0] &= ~0x7B;
764                         modem_ctl[0] |= 0x09;
765                         modem_ctl[1] = 0x80;
766                         dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
767                 } else {
768                         modem_ctl[0] &= ~0x7B;
769                         modem_ctl[0] |= 0x01;
770                         modem_ctl[1] |= 0x40;
771                         dev_dbg(dev, "%s - flow control = NONE\n", __func__);
772                 }
773 
774                 dev_dbg(dev, "%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n",
775                         __func__, modem_ctl[0], modem_ctl[1],
776                         modem_ctl[2], modem_ctl[3]);
777                 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16);
778         }
779 
780 }
781 
782 static int cp210x_tiocmset(struct tty_struct *tty,
783                 unsigned int set, unsigned int clear)
784 {
785         struct usb_serial_port *port = tty->driver_data;
786         return cp210x_tiocmset_port(port, set, clear);
787 }
788 
789 static int cp210x_tiocmset_port(struct usb_serial_port *port,
790                 unsigned int set, unsigned int clear)
791 {
792         unsigned int control = 0;
793 
794         if (set & TIOCM_RTS) {
795                 control |= CONTROL_RTS;
796                 control |= CONTROL_WRITE_RTS;
797         }
798         if (set & TIOCM_DTR) {
799                 control |= CONTROL_DTR;
800                 control |= CONTROL_WRITE_DTR;
801         }
802         if (clear & TIOCM_RTS) {
803                 control &= ~CONTROL_RTS;
804                 control |= CONTROL_WRITE_RTS;
805         }
806         if (clear & TIOCM_DTR) {
807                 control &= ~CONTROL_DTR;
808                 control |= CONTROL_WRITE_DTR;
809         }
810 
811         dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
812 
813         return cp210x_set_config(port, CP210X_SET_MHS, &control, 2);
814 }
815 
816 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
817 {
818         if (on)
819                 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
820         else
821                 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
822 }
823 
824 static int cp210x_tiocmget(struct tty_struct *tty)
825 {
826         struct usb_serial_port *port = tty->driver_data;
827         unsigned int control;
828         int result;
829 
830         cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1);
831 
832         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
833                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
834                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
835                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
836                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
837                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
838 
839         dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
840 
841         return result;
842 }
843 
844 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
845 {
846         struct usb_serial_port *port = tty->driver_data;
847         unsigned int state;
848 
849         if (break_state == 0)
850                 state = BREAK_OFF;
851         else
852                 state = BREAK_ON;
853         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
854                 state == BREAK_OFF ? "off" : "on");
855         cp210x_set_config(port, CP210X_SET_BREAK, &state, 2);
856 }
857 
858 static int cp210x_startup(struct usb_serial *serial)
859 {
860         struct usb_host_interface *cur_altsetting;
861         struct cp210x_serial_private *spriv;
862 
863         spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
864         if (!spriv)
865                 return -ENOMEM;
866 
867         cur_altsetting = serial->interface->cur_altsetting;
868         spriv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber;
869 
870         usb_set_serial_data(serial, spriv);
871 
872         return 0;
873 }
874 
875 static void cp210x_release(struct usb_serial *serial)
876 {
877         struct cp210x_serial_private *spriv;
878 
879         spriv = usb_get_serial_data(serial);
880         kfree(spriv);
881 }
882 
883 module_usb_serial_driver(serial_drivers, id_table);
884 
885 MODULE_DESCRIPTION(DRIVER_DESC);
886 MODULE_LICENSE("GPL");
887 

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