Version:  2.0.40 2.2.26 2.4.37 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 4.1 4.2

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, 0x8998) }, /* KCF Technologies PRN */
131         { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
132         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
133         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
134         { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
135         { USB_DEVICE(0x10C4, 0xEA80) }, /* Silicon Labs factory default */
136         { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
137         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
138         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
139         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
140         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
141         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
142         { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
143         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
144         { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
145         { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
146         { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
147         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
148         { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
149         { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
150         { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
151         { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
152         { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
153         { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
154         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
155         { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
156         { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
157         { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
158         { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
159         { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
160         { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
161         { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
162         { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
163         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
164         { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
165         { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
166         { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
167         { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
168         { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
169         { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
170         { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
171         { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
172         { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
173         { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
174         { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
175         { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
176         { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
177         { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
178         { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
179         { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
180         { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
181         { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
182         { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
183         { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
184         { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
185         { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
186         { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
187         { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
188         { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
189         { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
190         { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
191         { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
192         { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
193         { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
194         { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
195         { } /* Terminating Entry */
196 };
197 
198 MODULE_DEVICE_TABLE(usb, id_table);
199 
200 struct cp210x_serial_private {
201         __u8                    bInterfaceNumber;
202 };
203 
204 static struct usb_serial_driver cp210x_device = {
205         .driver = {
206                 .owner =        THIS_MODULE,
207                 .name =         "cp210x",
208         },
209         .id_table               = id_table,
210         .num_ports              = 1,
211         .bulk_in_size           = 256,
212         .bulk_out_size          = 256,
213         .open                   = cp210x_open,
214         .close                  = cp210x_close,
215         .break_ctl              = cp210x_break_ctl,
216         .set_termios            = cp210x_set_termios,
217         .tiocmget               = cp210x_tiocmget,
218         .tiocmset               = cp210x_tiocmset,
219         .attach                 = cp210x_startup,
220         .release                = cp210x_release,
221         .dtr_rts                = cp210x_dtr_rts
222 };
223 
224 static struct usb_serial_driver * const serial_drivers[] = {
225         &cp210x_device, NULL
226 };
227 
228 /* Config request types */
229 #define REQTYPE_HOST_TO_INTERFACE       0x41
230 #define REQTYPE_INTERFACE_TO_HOST       0xc1
231 #define REQTYPE_HOST_TO_DEVICE  0x40
232 #define REQTYPE_DEVICE_TO_HOST  0xc0
233 
234 /* Config request codes */
235 #define CP210X_IFC_ENABLE       0x00
236 #define CP210X_SET_BAUDDIV      0x01
237 #define CP210X_GET_BAUDDIV      0x02
238 #define CP210X_SET_LINE_CTL     0x03
239 #define CP210X_GET_LINE_CTL     0x04
240 #define CP210X_SET_BREAK        0x05
241 #define CP210X_IMM_CHAR         0x06
242 #define CP210X_SET_MHS          0x07
243 #define CP210X_GET_MDMSTS       0x08
244 #define CP210X_SET_XON          0x09
245 #define CP210X_SET_XOFF         0x0A
246 #define CP210X_SET_EVENTMASK    0x0B
247 #define CP210X_GET_EVENTMASK    0x0C
248 #define CP210X_SET_CHAR         0x0D
249 #define CP210X_GET_CHARS        0x0E
250 #define CP210X_GET_PROPS        0x0F
251 #define CP210X_GET_COMM_STATUS  0x10
252 #define CP210X_RESET            0x11
253 #define CP210X_PURGE            0x12
254 #define CP210X_SET_FLOW         0x13
255 #define CP210X_GET_FLOW         0x14
256 #define CP210X_EMBED_EVENTS     0x15
257 #define CP210X_GET_EVENTSTATE   0x16
258 #define CP210X_SET_CHARS        0x19
259 #define CP210X_GET_BAUDRATE     0x1D
260 #define CP210X_SET_BAUDRATE     0x1E
261 
262 /* CP210X_IFC_ENABLE */
263 #define UART_ENABLE             0x0001
264 #define UART_DISABLE            0x0000
265 
266 /* CP210X_(SET|GET)_BAUDDIV */
267 #define BAUD_RATE_GEN_FREQ      0x384000
268 
269 /* CP210X_(SET|GET)_LINE_CTL */
270 #define BITS_DATA_MASK          0X0f00
271 #define BITS_DATA_5             0X0500
272 #define BITS_DATA_6             0X0600
273 #define BITS_DATA_7             0X0700
274 #define BITS_DATA_8             0X0800
275 #define BITS_DATA_9             0X0900
276 
277 #define BITS_PARITY_MASK        0x00f0
278 #define BITS_PARITY_NONE        0x0000
279 #define BITS_PARITY_ODD         0x0010
280 #define BITS_PARITY_EVEN        0x0020
281 #define BITS_PARITY_MARK        0x0030
282 #define BITS_PARITY_SPACE       0x0040
283 
284 #define BITS_STOP_MASK          0x000f
285 #define BITS_STOP_1             0x0000
286 #define BITS_STOP_1_5           0x0001
287 #define BITS_STOP_2             0x0002
288 
289 /* CP210X_SET_BREAK */
290 #define BREAK_ON                0x0001
291 #define BREAK_OFF               0x0000
292 
293 /* CP210X_(SET_MHS|GET_MDMSTS) */
294 #define CONTROL_DTR             0x0001
295 #define CONTROL_RTS             0x0002
296 #define CONTROL_CTS             0x0010
297 #define CONTROL_DSR             0x0020
298 #define CONTROL_RING            0x0040
299 #define CONTROL_DCD             0x0080
300 #define CONTROL_WRITE_DTR       0x0100
301 #define CONTROL_WRITE_RTS       0x0200
302 
303 /*
304  * cp210x_get_config
305  * Reads from the CP210x configuration registers
306  * 'size' is specified in bytes.
307  * 'data' is a pointer to a pre-allocated array of integers large
308  * enough to hold 'size' bytes (with 4 bytes to each integer)
309  */
310 static int cp210x_get_config(struct usb_serial_port *port, u8 request,
311                 unsigned int *data, int size)
312 {
313         struct usb_serial *serial = port->serial;
314         struct cp210x_serial_private *spriv = usb_get_serial_data(serial);
315         __le32 *buf;
316         int result, i, length;
317 
318         /* Number of integers required to contain the array */
319         length = (((size - 1) | 3) + 1) / 4;
320 
321         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
322         if (!buf)
323                 return -ENOMEM;
324 
325         /* Issue the request, attempting to read 'size' bytes */
326         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
327                                 request, REQTYPE_INTERFACE_TO_HOST, 0x0000,
328                                 spriv->bInterfaceNumber, buf, size,
329                                 USB_CTRL_GET_TIMEOUT);
330 
331         /* Convert data into an array of integers */
332         for (i = 0; i < length; i++)
333                 data[i] = le32_to_cpu(buf[i]);
334 
335         kfree(buf);
336 
337         if (result != size) {
338                 dev_dbg(&port->dev, "%s - Unable to send config request, request=0x%x size=%d result=%d\n",
339                         __func__, request, size, result);
340                 if (result > 0)
341                         result = -EPROTO;
342 
343                 return result;
344         }
345 
346         return 0;
347 }
348 
349 /*
350  * cp210x_set_config
351  * Writes to the CP210x configuration registers
352  * Values less than 16 bits wide are sent directly
353  * 'size' is specified in bytes.
354  */
355 static int cp210x_set_config(struct usb_serial_port *port, u8 request,
356                 unsigned int *data, int size)
357 {
358         struct usb_serial *serial = port->serial;
359         struct cp210x_serial_private *spriv = usb_get_serial_data(serial);
360         __le32 *buf;
361         int result, i, length;
362 
363         /* Number of integers required to contain the array */
364         length = (((size - 1) | 3) + 1) / 4;
365 
366         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
367         if (!buf)
368                 return -ENOMEM;
369 
370         /* Array of integers into bytes */
371         for (i = 0; i < length; i++)
372                 buf[i] = cpu_to_le32(data[i]);
373 
374         if (size > 2) {
375                 result = usb_control_msg(serial->dev,
376                                 usb_sndctrlpipe(serial->dev, 0),
377                                 request, REQTYPE_HOST_TO_INTERFACE, 0x0000,
378                                 spriv->bInterfaceNumber, buf, size,
379                                 USB_CTRL_SET_TIMEOUT);
380         } else {
381                 result = usb_control_msg(serial->dev,
382                                 usb_sndctrlpipe(serial->dev, 0),
383                                 request, REQTYPE_HOST_TO_INTERFACE, data[0],
384                                 spriv->bInterfaceNumber, NULL, 0,
385                                 USB_CTRL_SET_TIMEOUT);
386         }
387 
388         kfree(buf);
389 
390         if ((size > 2 && result != size) || result < 0) {
391                 dev_dbg(&port->dev, "%s - Unable to send request, request=0x%x size=%d result=%d\n",
392                         __func__, request, size, result);
393                 if (result > 0)
394                         result = -EPROTO;
395 
396                 return result;
397         }
398 
399         return 0;
400 }
401 
402 /*
403  * cp210x_set_config_single
404  * Convenience function for calling cp210x_set_config on single data values
405  * without requiring an integer pointer
406  */
407 static inline int cp210x_set_config_single(struct usb_serial_port *port,
408                 u8 request, unsigned int data)
409 {
410         return cp210x_set_config(port, request, &data, 2);
411 }
412 
413 /*
414  * cp210x_quantise_baudrate
415  * Quantises the baud rate as per AN205 Table 1
416  */
417 static unsigned int cp210x_quantise_baudrate(unsigned int baud)
418 {
419         if (baud <= 300)
420                 baud = 300;
421         else if (baud <= 600)      baud = 600;
422         else if (baud <= 1200)     baud = 1200;
423         else if (baud <= 1800)     baud = 1800;
424         else if (baud <= 2400)     baud = 2400;
425         else if (baud <= 4000)     baud = 4000;
426         else if (baud <= 4803)     baud = 4800;
427         else if (baud <= 7207)     baud = 7200;
428         else if (baud <= 9612)     baud = 9600;
429         else if (baud <= 14428)    baud = 14400;
430         else if (baud <= 16062)    baud = 16000;
431         else if (baud <= 19250)    baud = 19200;
432         else if (baud <= 28912)    baud = 28800;
433         else if (baud <= 38601)    baud = 38400;
434         else if (baud <= 51558)    baud = 51200;
435         else if (baud <= 56280)    baud = 56000;
436         else if (baud <= 58053)    baud = 57600;
437         else if (baud <= 64111)    baud = 64000;
438         else if (baud <= 77608)    baud = 76800;
439         else if (baud <= 117028)   baud = 115200;
440         else if (baud <= 129347)   baud = 128000;
441         else if (baud <= 156868)   baud = 153600;
442         else if (baud <= 237832)   baud = 230400;
443         else if (baud <= 254234)   baud = 250000;
444         else if (baud <= 273066)   baud = 256000;
445         else if (baud <= 491520)   baud = 460800;
446         else if (baud <= 567138)   baud = 500000;
447         else if (baud <= 670254)   baud = 576000;
448         else if (baud < 1000000)
449                 baud = 921600;
450         else if (baud > 2000000)
451                 baud = 2000000;
452         return baud;
453 }
454 
455 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
456 {
457         int result;
458 
459         result = cp210x_set_config_single(port, CP210X_IFC_ENABLE,
460                                                                 UART_ENABLE);
461         if (result) {
462                 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
463                 return result;
464         }
465 
466         /* Configure the termios structure */
467         cp210x_get_termios(tty, port);
468 
469         /* The baud rate must be initialised on cp2104 */
470         if (tty)
471                 cp210x_change_speed(tty, port, NULL);
472 
473         return usb_serial_generic_open(tty, port);
474 }
475 
476 static void cp210x_close(struct usb_serial_port *port)
477 {
478         usb_serial_generic_close(port);
479         cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE);
480 }
481 
482 /*
483  * cp210x_get_termios
484  * Reads the baud rate, data bits, parity, stop bits and flow control mode
485  * from the device, corrects any unsupported values, and configures the
486  * termios structure to reflect the state of the device
487  */
488 static void cp210x_get_termios(struct tty_struct *tty,
489         struct usb_serial_port *port)
490 {
491         unsigned int baud;
492 
493         if (tty) {
494                 cp210x_get_termios_port(tty->driver_data,
495                         &tty->termios.c_cflag, &baud);
496                 tty_encode_baud_rate(tty, baud, baud);
497         } else {
498                 unsigned int cflag;
499                 cflag = 0;
500                 cp210x_get_termios_port(port, &cflag, &baud);
501         }
502 }
503 
504 /*
505  * cp210x_get_termios_port
506  * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
507  */
508 static void cp210x_get_termios_port(struct usb_serial_port *port,
509         unsigned int *cflagp, unsigned int *baudp)
510 {
511         struct device *dev = &port->dev;
512         unsigned int cflag, modem_ctl[4];
513         unsigned int baud;
514         unsigned int bits;
515 
516         cp210x_get_config(port, CP210X_GET_BAUDRATE, &baud, 4);
517 
518         dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
519         *baudp = baud;
520 
521         cflag = *cflagp;
522 
523         cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
524         cflag &= ~CSIZE;
525         switch (bits & BITS_DATA_MASK) {
526         case BITS_DATA_5:
527                 dev_dbg(dev, "%s - data bits = 5\n", __func__);
528                 cflag |= CS5;
529                 break;
530         case BITS_DATA_6:
531                 dev_dbg(dev, "%s - data bits = 6\n", __func__);
532                 cflag |= CS6;
533                 break;
534         case BITS_DATA_7:
535                 dev_dbg(dev, "%s - data bits = 7\n", __func__);
536                 cflag |= CS7;
537                 break;
538         case BITS_DATA_8:
539                 dev_dbg(dev, "%s - data bits = 8\n", __func__);
540                 cflag |= CS8;
541                 break;
542         case BITS_DATA_9:
543                 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
544                 cflag |= CS8;
545                 bits &= ~BITS_DATA_MASK;
546                 bits |= BITS_DATA_8;
547                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
548                 break;
549         default:
550                 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
551                 cflag |= CS8;
552                 bits &= ~BITS_DATA_MASK;
553                 bits |= BITS_DATA_8;
554                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
555                 break;
556         }
557 
558         switch (bits & BITS_PARITY_MASK) {
559         case BITS_PARITY_NONE:
560                 dev_dbg(dev, "%s - parity = NONE\n", __func__);
561                 cflag &= ~PARENB;
562                 break;
563         case BITS_PARITY_ODD:
564                 dev_dbg(dev, "%s - parity = ODD\n", __func__);
565                 cflag |= (PARENB|PARODD);
566                 break;
567         case BITS_PARITY_EVEN:
568                 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
569                 cflag &= ~PARODD;
570                 cflag |= PARENB;
571                 break;
572         case BITS_PARITY_MARK:
573                 dev_dbg(dev, "%s - parity = MARK\n", __func__);
574                 cflag |= (PARENB|PARODD|CMSPAR);
575                 break;
576         case BITS_PARITY_SPACE:
577                 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
578                 cflag &= ~PARODD;
579                 cflag |= (PARENB|CMSPAR);
580                 break;
581         default:
582                 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
583                 cflag &= ~PARENB;
584                 bits &= ~BITS_PARITY_MASK;
585                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
586                 break;
587         }
588 
589         cflag &= ~CSTOPB;
590         switch (bits & BITS_STOP_MASK) {
591         case BITS_STOP_1:
592                 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
593                 break;
594         case BITS_STOP_1_5:
595                 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
596                 bits &= ~BITS_STOP_MASK;
597                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
598                 break;
599         case BITS_STOP_2:
600                 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
601                 cflag |= CSTOPB;
602                 break;
603         default:
604                 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
605                 bits &= ~BITS_STOP_MASK;
606                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
607                 break;
608         }
609 
610         cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
611         if (modem_ctl[0] & 0x0008) {
612                 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
613                 cflag |= CRTSCTS;
614         } else {
615                 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
616                 cflag &= ~CRTSCTS;
617         }
618 
619         *cflagp = cflag;
620 }
621 
622 /*
623  * CP2101 supports the following baud rates:
624  *
625  *      300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
626  *      38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
627  *
628  * CP2102 and CP2103 support the following additional rates:
629  *
630  *      4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
631  *      576000
632  *
633  * The device will map a requested rate to a supported one, but the result
634  * of requests for rates greater than 1053257 is undefined (see AN205).
635  *
636  * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
637  * respectively, with an error less than 1%. The actual rates are determined
638  * by
639  *
640  *      div = round(freq / (2 x prescale x request))
641  *      actual = freq / (2 x prescale x div)
642  *
643  * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
644  * or 1 otherwise.
645  * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
646  * otherwise.
647  */
648 static void cp210x_change_speed(struct tty_struct *tty,
649                 struct usb_serial_port *port, struct ktermios *old_termios)
650 {
651         u32 baud;
652 
653         baud = tty->termios.c_ospeed;
654 
655         /* This maps the requested rate to a rate valid on cp2102 or cp2103,
656          * or to an arbitrary rate in [1M,2M].
657          *
658          * NOTE: B0 is not implemented.
659          */
660         baud = cp210x_quantise_baudrate(baud);
661 
662         dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
663         if (cp210x_set_config(port, CP210X_SET_BAUDRATE, &baud,
664                                                         sizeof(baud))) {
665                 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
666                 if (old_termios)
667                         baud = old_termios->c_ospeed;
668                 else
669                         baud = 9600;
670         }
671 
672         tty_encode_baud_rate(tty, baud, baud);
673 }
674 
675 static void cp210x_set_termios(struct tty_struct *tty,
676                 struct usb_serial_port *port, struct ktermios *old_termios)
677 {
678         struct device *dev = &port->dev;
679         unsigned int cflag, old_cflag;
680         unsigned int bits;
681         unsigned int modem_ctl[4];
682 
683         cflag = tty->termios.c_cflag;
684         old_cflag = old_termios->c_cflag;
685 
686         if (tty->termios.c_ospeed != old_termios->c_ospeed)
687                 cp210x_change_speed(tty, port, old_termios);
688 
689         /* If the number of data bits is to be updated */
690         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
691                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
692                 bits &= ~BITS_DATA_MASK;
693                 switch (cflag & CSIZE) {
694                 case CS5:
695                         bits |= BITS_DATA_5;
696                         dev_dbg(dev, "%s - data bits = 5\n", __func__);
697                         break;
698                 case CS6:
699                         bits |= BITS_DATA_6;
700                         dev_dbg(dev, "%s - data bits = 6\n", __func__);
701                         break;
702                 case CS7:
703                         bits |= BITS_DATA_7;
704                         dev_dbg(dev, "%s - data bits = 7\n", __func__);
705                         break;
706                 case CS8:
707                         bits |= BITS_DATA_8;
708                         dev_dbg(dev, "%s - data bits = 8\n", __func__);
709                         break;
710                 /*case CS9:
711                         bits |= BITS_DATA_9;
712                         dev_dbg(dev, "%s - data bits = 9\n", __func__);
713                         break;*/
714                 default:
715                         dev_dbg(dev, "cp210x driver does not support the number of bits requested, using 8 bit mode\n");
716                         bits |= BITS_DATA_8;
717                         break;
718                 }
719                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
720                         dev_dbg(dev, "Number of data bits requested not supported by device\n");
721         }
722 
723         if ((cflag     & (PARENB|PARODD|CMSPAR)) !=
724             (old_cflag & (PARENB|PARODD|CMSPAR))) {
725                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
726                 bits &= ~BITS_PARITY_MASK;
727                 if (cflag & PARENB) {
728                         if (cflag & CMSPAR) {
729                                 if (cflag & PARODD) {
730                                         bits |= BITS_PARITY_MARK;
731                                         dev_dbg(dev, "%s - parity = MARK\n", __func__);
732                                 } else {
733                                         bits |= BITS_PARITY_SPACE;
734                                         dev_dbg(dev, "%s - parity = SPACE\n", __func__);
735                                 }
736                         } else {
737                                 if (cflag & PARODD) {
738                                         bits |= BITS_PARITY_ODD;
739                                         dev_dbg(dev, "%s - parity = ODD\n", __func__);
740                                 } else {
741                                         bits |= BITS_PARITY_EVEN;
742                                         dev_dbg(dev, "%s - parity = EVEN\n", __func__);
743                                 }
744                         }
745                 }
746                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
747                         dev_dbg(dev, "Parity mode not supported by device\n");
748         }
749 
750         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
751                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
752                 bits &= ~BITS_STOP_MASK;
753                 if (cflag & CSTOPB) {
754                         bits |= BITS_STOP_2;
755                         dev_dbg(dev, "%s - stop bits = 2\n", __func__);
756                 } else {
757                         bits |= BITS_STOP_1;
758                         dev_dbg(dev, "%s - stop bits = 1\n", __func__);
759                 }
760                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
761                         dev_dbg(dev, "Number of stop bits requested not supported by device\n");
762         }
763 
764         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
765                 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
766                 dev_dbg(dev, "%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n",
767                         __func__, modem_ctl[0], modem_ctl[1],
768                         modem_ctl[2], modem_ctl[3]);
769 
770                 if (cflag & CRTSCTS) {
771                         modem_ctl[0] &= ~0x7B;
772                         modem_ctl[0] |= 0x09;
773                         modem_ctl[1] = 0x80;
774                         dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
775                 } else {
776                         modem_ctl[0] &= ~0x7B;
777                         modem_ctl[0] |= 0x01;
778                         modem_ctl[1] |= 0x40;
779                         dev_dbg(dev, "%s - flow control = NONE\n", __func__);
780                 }
781 
782                 dev_dbg(dev, "%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n",
783                         __func__, modem_ctl[0], modem_ctl[1],
784                         modem_ctl[2], modem_ctl[3]);
785                 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16);
786         }
787 
788 }
789 
790 static int cp210x_tiocmset(struct tty_struct *tty,
791                 unsigned int set, unsigned int clear)
792 {
793         struct usb_serial_port *port = tty->driver_data;
794         return cp210x_tiocmset_port(port, set, clear);
795 }
796 
797 static int cp210x_tiocmset_port(struct usb_serial_port *port,
798                 unsigned int set, unsigned int clear)
799 {
800         unsigned int control = 0;
801 
802         if (set & TIOCM_RTS) {
803                 control |= CONTROL_RTS;
804                 control |= CONTROL_WRITE_RTS;
805         }
806         if (set & TIOCM_DTR) {
807                 control |= CONTROL_DTR;
808                 control |= CONTROL_WRITE_DTR;
809         }
810         if (clear & TIOCM_RTS) {
811                 control &= ~CONTROL_RTS;
812                 control |= CONTROL_WRITE_RTS;
813         }
814         if (clear & TIOCM_DTR) {
815                 control &= ~CONTROL_DTR;
816                 control |= CONTROL_WRITE_DTR;
817         }
818 
819         dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
820 
821         return cp210x_set_config(port, CP210X_SET_MHS, &control, 2);
822 }
823 
824 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
825 {
826         if (on)
827                 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
828         else
829                 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
830 }
831 
832 static int cp210x_tiocmget(struct tty_struct *tty)
833 {
834         struct usb_serial_port *port = tty->driver_data;
835         unsigned int control;
836         int result;
837 
838         cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1);
839 
840         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
841                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
842                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
843                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
844                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
845                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
846 
847         dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
848 
849         return result;
850 }
851 
852 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
853 {
854         struct usb_serial_port *port = tty->driver_data;
855         unsigned int state;
856 
857         if (break_state == 0)
858                 state = BREAK_OFF;
859         else
860                 state = BREAK_ON;
861         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
862                 state == BREAK_OFF ? "off" : "on");
863         cp210x_set_config(port, CP210X_SET_BREAK, &state, 2);
864 }
865 
866 static int cp210x_startup(struct usb_serial *serial)
867 {
868         struct usb_host_interface *cur_altsetting;
869         struct cp210x_serial_private *spriv;
870 
871         spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
872         if (!spriv)
873                 return -ENOMEM;
874 
875         cur_altsetting = serial->interface->cur_altsetting;
876         spriv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber;
877 
878         usb_set_serial_data(serial, spriv);
879 
880         return 0;
881 }
882 
883 static void cp210x_release(struct usb_serial *serial)
884 {
885         struct cp210x_serial_private *spriv;
886 
887         spriv = usb_get_serial_data(serial);
888         kfree(spriv);
889 }
890 
891 module_usb_serial_driver(serial_drivers, id_table);
892 
893 MODULE_DESCRIPTION(DRIVER_DESC);
894 MODULE_LICENSE("GPL");
895 

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