Version:  2.0.40 2.2.26 2.4.37 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 3.19

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

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