blob: 81dd53bb52673c5e5efdc1ba20a9b73429e80cfc [file] [log] [blame]
Thierry MERLEf2242ee2006-12-04 08:31:14 -03001/*
Thierry MERLE1ff16c22007-04-14 16:23:49 -03002 * usbvision_i2c.c
Mauro Carvalho Chehab781aa1d2006-12-04 08:30:53 -03003 * i2c algorithm for USB-I2C Bridges
4 *
Thierry MERLE1ff16c22007-04-14 16:23:49 -03005 * Copyright (c) 1999-2007 Joerg Heckenbach <joerg@heckenbach-aw.de>
Mauro Carvalho Chehab781aa1d2006-12-04 08:30:53 -03006 * Dwaine Garden <dwainegarden@rogers.com>
7 *
8 * This module is part of usbvision driver project.
9 * Updates to driver completed by Dwaine P. Garden
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 */
25
26
27#include <linux/kernel.h>
28#include <linux/module.h>
29#include <linux/delay.h>
Mauro Carvalho Chehab781aa1d2006-12-04 08:30:53 -030030#include <linux/init.h>
31#include <asm/uaccess.h>
32#include <linux/ioport.h>
33#include <linux/errno.h>
Mauro Carvalho Chehab781aa1d2006-12-04 08:30:53 -030034#include <linux/usb.h>
35#include <linux/i2c.h>
Thierry MERLE483dfdb2006-12-04 08:31:45 -030036#include "usbvision.h"
Mauro Carvalho Chehab781aa1d2006-12-04 08:30:53 -030037
Thierry MERLE483dfdb2006-12-04 08:31:45 -030038#define DBG_I2C 1<<0
Mauro Carvalho Chehab781aa1d2006-12-04 08:30:53 -030039
Douglas Schilling Landgrafff699e62008-04-22 14:41:48 -030040static int i2c_debug;
Mauro Carvalho Chehab781aa1d2006-12-04 08:30:53 -030041
Thierry MERLE483dfdb2006-12-04 08:31:45 -030042module_param (i2c_debug, int, 0644); // debug_i2c_usb mode of the device driver
43MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
44
Thierry MERLEdf18c312008-04-04 21:00:57 -030045#define PDEBUG(level, fmt, args...) { \
46 if (i2c_debug & (level)) \
Greg Kroah-Hartmana482f322008-10-10 05:08:23 -030047 printk(KERN_INFO KBUILD_MODNAME ":[%s:%d] " fmt, \
48 __func__, __LINE__ , ## args); \
Thierry MERLEdf18c312008-04-04 21:00:57 -030049 }
Mauro Carvalho Chehab781aa1d2006-12-04 08:30:53 -030050
Thierry MERLE1ff16c22007-04-14 16:23:49 -030051static int usbvision_i2c_write(struct usb_usbvision *usbvision, unsigned char addr, char *buf,
Mauro Carvalho Chehab2a7e9a22006-12-11 05:37:14 -030052 short len);
Thierry MERLE1ff16c22007-04-14 16:23:49 -030053static int usbvision_i2c_read(struct usb_usbvision *usbvision, unsigned char addr, char *buf,
Mauro Carvalho Chehab2a7e9a22006-12-11 05:37:14 -030054 short len);
55
Mauro Carvalho Chehab781aa1d2006-12-04 08:30:53 -030056static inline int try_write_address(struct i2c_adapter *i2c_adap,
57 unsigned char addr, int retries)
58{
Thierry MERLE1ff16c22007-04-14 16:23:49 -030059 struct usb_usbvision *usbvision;
Mauro Carvalho Chehab781aa1d2006-12-04 08:30:53 -030060 int i, ret = -1;
61 char buf[4];
62
Thierry MERLEbf8b20e2007-04-16 18:00:49 -030063 usbvision = (struct usb_usbvision *)i2c_get_adapdata(i2c_adap);
Mauro Carvalho Chehab781aa1d2006-12-04 08:30:53 -030064 buf[0] = 0x00;
65 for (i = 0; i <= retries; i++) {
Thierry MERLE1ff16c22007-04-14 16:23:49 -030066 ret = (usbvision_i2c_write(usbvision, addr, buf, 1));
Mauro Carvalho Chehab781aa1d2006-12-04 08:30:53 -030067 if (ret == 1)
68 break; /* success! */
Mauro Carvalho Chehabc6268462006-12-11 17:18:15 -030069 udelay(5);
Mauro Carvalho Chehab781aa1d2006-12-04 08:30:53 -030070 if (i == retries) /* no success */
71 break;
Mauro Carvalho Chehabc6268462006-12-11 17:18:15 -030072 udelay(10);
Mauro Carvalho Chehab781aa1d2006-12-04 08:30:53 -030073 }
Thierry MERLE483dfdb2006-12-04 08:31:45 -030074 if (i) {
Thierry MERLE1ff16c22007-04-14 16:23:49 -030075 PDEBUG(DBG_I2C,"Needed %d retries for address %#2x", i, addr);
76 PDEBUG(DBG_I2C,"Maybe there's no device at this address");
Mauro Carvalho Chehab781aa1d2006-12-04 08:30:53 -030077 }
78 return ret;
79}
80
81static inline int try_read_address(struct i2c_adapter *i2c_adap,
82 unsigned char addr, int retries)
83{
Thierry MERLE1ff16c22007-04-14 16:23:49 -030084 struct usb_usbvision *usbvision;
Mauro Carvalho Chehab781aa1d2006-12-04 08:30:53 -030085 int i, ret = -1;
86 char buf[4];
87
Thierry MERLEbf8b20e2007-04-16 18:00:49 -030088 usbvision = (struct usb_usbvision *)i2c_get_adapdata(i2c_adap);
Mauro Carvalho Chehab781aa1d2006-12-04 08:30:53 -030089 for (i = 0; i <= retries; i++) {
Thierry MERLE1ff16c22007-04-14 16:23:49 -030090 ret = (usbvision_i2c_read(usbvision, addr, buf, 1));
Mauro Carvalho Chehab781aa1d2006-12-04 08:30:53 -030091 if (ret == 1)
92 break; /* success! */
Mauro Carvalho Chehabc6268462006-12-11 17:18:15 -030093 udelay(5);
Mauro Carvalho Chehab781aa1d2006-12-04 08:30:53 -030094 if (i == retries) /* no success */
95 break;
Mauro Carvalho Chehabc6268462006-12-11 17:18:15 -030096 udelay(10);
Mauro Carvalho Chehab781aa1d2006-12-04 08:30:53 -030097 }
Thierry MERLE483dfdb2006-12-04 08:31:45 -030098 if (i) {
Thierry MERLE1ff16c22007-04-14 16:23:49 -030099 PDEBUG(DBG_I2C,"Needed %d retries for address %#2x", i, addr);
100 PDEBUG(DBG_I2C,"Maybe there's no device at this address");
Mauro Carvalho Chehab781aa1d2006-12-04 08:30:53 -0300101 }
102 return ret;
103}
104
105static inline int usb_find_address(struct i2c_adapter *i2c_adap,
106 struct i2c_msg *msg, int retries,
107 unsigned char *add)
108{
109 unsigned short flags = msg->flags;
Thierry MERLEf2242ee2006-12-04 08:31:14 -0300110
Mauro Carvalho Chehab781aa1d2006-12-04 08:30:53 -0300111 unsigned char addr;
112 int ret;
113 if ((flags & I2C_M_TEN)) {
114 /* a ten bit address */
115 addr = 0xf0 | ((msg->addr >> 7) & 0x03);
116 /* try extended address code... */
117 ret = try_write_address(i2c_adap, addr, retries);
118 if (ret != 1) {
Mauro Carvalho Chehabbe9ed512009-01-08 09:13:42 -0300119 dev_err(&i2c_adap->dev,
120 "died at extended address code, while writing\n");
Mauro Carvalho Chehab781aa1d2006-12-04 08:30:53 -0300121 return -EREMOTEIO;
122 }
123 add[0] = addr;
124 if (flags & I2C_M_RD) {
125 /* okay, now switch into reading mode */
126 addr |= 0x01;
127 ret = try_read_address(i2c_adap, addr, retries);
128 if (ret != 1) {
Mauro Carvalho Chehabbe9ed512009-01-08 09:13:42 -0300129 dev_err(&i2c_adap->dev,
130 "died at extended address code, while reading\n");
Mauro Carvalho Chehab781aa1d2006-12-04 08:30:53 -0300131 return -EREMOTEIO;
132 }
133 }
134
135 } else { /* normal 7bit address */
136 addr = (msg->addr << 1);
137 if (flags & I2C_M_RD)
138 addr |= 1;
Mauro Carvalho Chehab781aa1d2006-12-04 08:30:53 -0300139
140 add[0] = addr;
141 if (flags & I2C_M_RD)
142 ret = try_read_address(i2c_adap, addr, retries);
143 else
144 ret = try_write_address(i2c_adap, addr, retries);
145
146 if (ret != 1) {
147 return -EREMOTEIO;
148 }
149 }
150 return 0;
151}
152
153static int
Thierry MERLE1ff16c22007-04-14 16:23:49 -0300154usbvision_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg msgs[], int num)
Mauro Carvalho Chehab781aa1d2006-12-04 08:30:53 -0300155{
156 struct i2c_msg *pmsg;
Thierry MERLE1ff16c22007-04-14 16:23:49 -0300157 struct usb_usbvision *usbvision;
Mauro Carvalho Chehab781aa1d2006-12-04 08:30:53 -0300158 int i, ret;
Hans Verkuilcf8e1932009-01-17 13:09:11 -0300159 unsigned char addr = 0;
Mauro Carvalho Chehab781aa1d2006-12-04 08:30:53 -0300160
Thierry MERLEbf8b20e2007-04-16 18:00:49 -0300161 usbvision = (struct usb_usbvision *)i2c_get_adapdata(i2c_adap);
162
Mauro Carvalho Chehab781aa1d2006-12-04 08:30:53 -0300163 for (i = 0; i < num; i++) {
164 pmsg = &msgs[i];
165 ret = usb_find_address(i2c_adap, pmsg, i2c_adap->retries, &addr);
166 if (ret != 0) {
Thierry MERLE1ff16c22007-04-14 16:23:49 -0300167 PDEBUG(DBG_I2C,"got NAK from device, message #%d", i);
Mauro Carvalho Chehab781aa1d2006-12-04 08:30:53 -0300168 return (ret < 0) ? ret : -EREMOTEIO;
169 }
170
171 if (pmsg->flags & I2C_M_RD) {
172 /* read bytes into buffer */
Thierry MERLE1ff16c22007-04-14 16:23:49 -0300173 ret = (usbvision_i2c_read(usbvision, addr, pmsg->buf, pmsg->len));
Mauro Carvalho Chehab781aa1d2006-12-04 08:30:53 -0300174 if (ret < pmsg->len) {
175 return (ret < 0) ? ret : -EREMOTEIO;
176 }
177 } else {
178 /* write bytes from buffer */
Thierry MERLE1ff16c22007-04-14 16:23:49 -0300179 ret = (usbvision_i2c_write(usbvision, addr, pmsg->buf, pmsg->len));
Mauro Carvalho Chehab781aa1d2006-12-04 08:30:53 -0300180 if (ret < pmsg->len) {
181 return (ret < 0) ? ret : -EREMOTEIO;
182 }
183 }
184 }
185 return num;
186}
187
Thierry MERLE1ff16c22007-04-14 16:23:49 -0300188static u32 functionality(struct i2c_adapter *adap)
Mauro Carvalho Chehab781aa1d2006-12-04 08:30:53 -0300189{
Jean Delvare39f46ad2007-09-09 06:17:44 -0300190 return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_10BIT_ADDR;
Mauro Carvalho Chehab781aa1d2006-12-04 08:30:53 -0300191}
192
Mauro Carvalho Chehab781aa1d2006-12-04 08:30:53 -0300193/* -----exported algorithm data: ------------------------------------- */
194
Thierry MERLE1ff16c22007-04-14 16:23:49 -0300195static struct i2c_algorithm usbvision_algo = {
196 .master_xfer = usbvision_i2c_xfer,
Mauro Carvalho Chehab781aa1d2006-12-04 08:30:53 -0300197 .smbus_xfer = NULL,
Thierry MERLE1ff16c22007-04-14 16:23:49 -0300198 .functionality = functionality,
Mauro Carvalho Chehab781aa1d2006-12-04 08:30:53 -0300199};
200
201
Thierry MERLE483dfdb2006-12-04 08:31:45 -0300202/* ----------------------------------------------------------------------- */
203/* usbvision specific I2C functions */
204/* ----------------------------------------------------------------------- */
205static struct i2c_adapter i2c_adap_template;
Thierry MERLE483dfdb2006-12-04 08:31:45 -0300206
Thierry MERLE1ff16c22007-04-14 16:23:49 -0300207int usbvision_i2c_register(struct usb_usbvision *usbvision)
Thierry MERLE483dfdb2006-12-04 08:31:45 -0300208{
Hans Verkuil1df79532009-02-21 18:11:31 -0300209 static unsigned short saa711x_addrs[] = {
210 0x4a >> 1, 0x48 >> 1, /* SAA7111, SAA7111A and SAA7113 */
211 0x42 >> 1, 0x40 >> 1, /* SAA7114, SAA7115 and SAA7118 */
212 I2C_CLIENT_END };
213
Hans Verkuil84034722010-09-17 15:07:28 -0300214 if (usbvision->registered_i2c)
215 return 0;
216
Thierry MERLEbf8b20e2007-04-16 18:00:49 -0300217 memcpy(&usbvision->i2c_adap, &i2c_adap_template,
218 sizeof(struct i2c_adapter));
Thierry MERLE483dfdb2006-12-04 08:31:45 -0300219
Laurent Pinchart0fda5d42009-11-27 13:57:18 -0300220 sprintf(usbvision->i2c_adap.name, "%s-%d-%s", i2c_adap_template.name,
221 usbvision->dev->bus->busnum, usbvision->dev->devpath);
Thierry MERLEbf8b20e2007-04-16 18:00:49 -0300222 PDEBUG(DBG_I2C,"Adaptername: %s", usbvision->i2c_adap.name);
223 usbvision->i2c_adap.dev.parent = &usbvision->dev->dev;
Thierry MERLE483dfdb2006-12-04 08:31:45 -0300224
Hans Verkuil1df79532009-02-21 18:11:31 -0300225 i2c_set_adapdata(&usbvision->i2c_adap, &usbvision->v4l2_dev);
Thierry MERLE483dfdb2006-12-04 08:31:45 -0300226
227 if (usbvision_write_reg(usbvision, USBVISION_SER_MODE, USBVISION_IIC_LRNACK) < 0) {
Thierry MERLEbf8b20e2007-04-16 18:00:49 -0300228 printk(KERN_ERR "usbvision_register: can't write reg\n");
Thierry MERLE483dfdb2006-12-04 08:31:45 -0300229 return -EBUSY;
230 }
231
Hans Verkuil1df79532009-02-21 18:11:31 -0300232 PDEBUG(DBG_I2C, "I2C debugging is enabled [i2c]");
233 PDEBUG(DBG_I2C, "ALGO debugging is enabled [i2c]");
234
235 /* register new adapter to i2c module... */
236
237 usbvision->i2c_adap.algo = &usbvision_algo;
238
239 usbvision->i2c_adap.timeout = 100; /* default values, should */
240 usbvision->i2c_adap.retries = 3; /* be replaced by defines */
241
242 i2c_add_adapter(&usbvision->i2c_adap);
243
244 PDEBUG(DBG_I2C, "i2c bus for %s registered", usbvision->i2c_adap.name);
245
Thierry MERLE483dfdb2006-12-04 08:31:45 -0300246 /* Request the load of the i2c modules we need */
247 switch (usbvision_device_data[usbvision->DevModel].Codec) {
248 case CODEC_SAA7113:
Thierry MERLE483dfdb2006-12-04 08:31:45 -0300249 case CODEC_SAA7111:
Hans Verkuil4d6c8712010-05-02 09:29:27 -0300250 /* Without this delay the detection of the saa711x is
251 hit-and-miss. */
252 mdelay(10);
Hans Verkuil53dacb12009-08-10 02:49:08 -0300253 v4l2_i2c_new_subdev(&usbvision->v4l2_dev,
Laurent Pinchart9a1f8b32010-09-24 10:16:44 -0300254 &usbvision->i2c_adap,
Hans Verkuil53dacb12009-08-10 02:49:08 -0300255 "saa7115_auto", 0, saa711x_addrs);
Thierry MERLE483dfdb2006-12-04 08:31:45 -0300256 break;
257 }
258 if (usbvision_device_data[usbvision->DevModel].Tuner == 1) {
Hans Verkuil1df79532009-02-21 18:11:31 -0300259 struct v4l2_subdev *sd;
260 enum v4l2_i2c_tuner_type type;
261 struct tuner_setup tun_setup;
Thierry MERLE483dfdb2006-12-04 08:31:45 -0300262
Hans Verkuil53dacb12009-08-10 02:49:08 -0300263 sd = v4l2_i2c_new_subdev(&usbvision->v4l2_dev,
Laurent Pinchart9a1f8b32010-09-24 10:16:44 -0300264 &usbvision->i2c_adap,
Hans Verkuil53dacb12009-08-10 02:49:08 -0300265 "tuner", 0, v4l2_i2c_tuner_addrs(ADDRS_DEMOD));
Hans Verkuil1df79532009-02-21 18:11:31 -0300266 /* depending on whether we found a demod or not, select
267 the tuner type. */
268 type = sd ? ADDRS_TV_WITH_DEMOD : ADDRS_TV;
269
Hans Verkuil53dacb12009-08-10 02:49:08 -0300270 sd = v4l2_i2c_new_subdev(&usbvision->v4l2_dev,
Laurent Pinchart9a1f8b32010-09-24 10:16:44 -0300271 &usbvision->i2c_adap,
Hans Verkuil53dacb12009-08-10 02:49:08 -0300272 "tuner", 0, v4l2_i2c_tuner_addrs(type));
Hans Verkuil1df79532009-02-21 18:11:31 -0300273
Hans Verkuil84034722010-09-17 15:07:28 -0300274 if (sd == NULL)
275 return -ENODEV;
Hans Verkuil1df79532009-02-21 18:11:31 -0300276 if (usbvision->tuner_type != -1) {
277 tun_setup.mode_mask = T_ANALOG_TV | T_RADIO;
278 tun_setup.type = usbvision->tuner_type;
279 tun_setup.addr = v4l2_i2c_subdev_addr(sd);
280 call_all(usbvision, tuner, s_type_addr, &tun_setup);
281 }
282 }
Hans Verkuil84034722010-09-17 15:07:28 -0300283 usbvision->registered_i2c = 1;
Hans Verkuil1df79532009-02-21 18:11:31 -0300284
285 return 0;
Thierry MERLE1ff16c22007-04-14 16:23:49 -0300286}
287
288int usbvision_i2c_unregister(struct usb_usbvision *usbvision)
289{
Hans Verkuil84034722010-09-17 15:07:28 -0300290 if (!usbvision->registered_i2c)
291 return 0;
Thierry MERLE1ff16c22007-04-14 16:23:49 -0300292
293 i2c_del_adapter(&(usbvision->i2c_adap));
Hans Verkuil84034722010-09-17 15:07:28 -0300294 usbvision->registered_i2c = 0;
Thierry MERLE1ff16c22007-04-14 16:23:49 -0300295
296 PDEBUG(DBG_I2C,"i2c bus for %s unregistered", usbvision->i2c_adap.name);
297
298 return 0;
Thierry MERLE483dfdb2006-12-04 08:31:45 -0300299}
300
Thierry MERLE483dfdb2006-12-04 08:31:45 -0300301static int
302usbvision_i2c_read_max4(struct usb_usbvision *usbvision, unsigned char addr,
303 char *buf, short len)
304{
305 int rc, retries;
306
307 for (retries = 5;;) {
308 rc = usbvision_write_reg(usbvision, USBVISION_SER_ADRS, addr);
309 if (rc < 0)
310 return rc;
311
312 /* Initiate byte read cycle */
313 /* USBVISION_SER_CONT <- d0-d2 n. of bytes to r/w */
314 /* d3 0=Wr 1=Rd */
315 rc = usbvision_write_reg(usbvision, USBVISION_SER_CONT,
316 (len & 0x07) | 0x18);
317 if (rc < 0)
318 return rc;
319
320 /* Test for Busy and ACK */
321 do {
322 /* USBVISION_SER_CONT -> d4 == 0 busy */
323 rc = usbvision_read_reg(usbvision, USBVISION_SER_CONT);
324 } while (rc > 0 && ((rc & 0x10) != 0)); /* Retry while busy */
325 if (rc < 0)
326 return rc;
327
328 /* USBVISION_SER_CONT -> d5 == 1 Not ack */
329 if ((rc & 0x20) == 0) /* Ack? */
330 break;
331
332 /* I2C abort */
333 rc = usbvision_write_reg(usbvision, USBVISION_SER_CONT, 0x00);
334 if (rc < 0)
335 return rc;
336
337 if (--retries < 0)
338 return -1;
339 }
340
341 switch (len) {
342 case 4:
343 buf[3] = usbvision_read_reg(usbvision, USBVISION_SER_DAT4);
344 case 3:
345 buf[2] = usbvision_read_reg(usbvision, USBVISION_SER_DAT3);
346 case 2:
347 buf[1] = usbvision_read_reg(usbvision, USBVISION_SER_DAT2);
348 case 1:
349 buf[0] = usbvision_read_reg(usbvision, USBVISION_SER_DAT1);
350 break;
351 default:
352 printk(KERN_ERR
353 "usbvision_i2c_read_max4: buffer length > 4\n");
354 }
355
356 if (i2c_debug & DBG_I2C) {
357 int idx;
358 for (idx = 0; idx < len; idx++) {
359 PDEBUG(DBG_I2C,"read %x from address %x", (unsigned char)buf[idx], addr);
360 }
361 }
362 return len;
363}
364
365
366static int usbvision_i2c_write_max4(struct usb_usbvision *usbvision,
367 unsigned char addr, const char *buf,
368 short len)
369{
370 int rc, retries;
371 int i;
372 unsigned char value[6];
373 unsigned char ser_cont;
374
375 ser_cont = (len & 0x07) | 0x10;
376
377 value[0] = addr;
378 value[1] = ser_cont;
379 for (i = 0; i < len; i++)
380 value[i + 2] = buf[i];
381
382 for (retries = 5;;) {
383 rc = usb_control_msg(usbvision->dev,
384 usb_sndctrlpipe(usbvision->dev, 1),
385 USBVISION_OP_CODE,
386 USB_DIR_OUT | USB_TYPE_VENDOR |
387 USB_RECIP_ENDPOINT, 0,
388 (__u16) USBVISION_SER_ADRS, value,
389 len + 2, HZ);
390
391 if (rc < 0)
392 return rc;
393
394 rc = usbvision_write_reg(usbvision, USBVISION_SER_CONT,
395 (len & 0x07) | 0x10);
396 if (rc < 0)
397 return rc;
398
399 /* Test for Busy and ACK */
400 do {
401 rc = usbvision_read_reg(usbvision, USBVISION_SER_CONT);
402 } while (rc > 0 && ((rc & 0x10) != 0)); /* Retry while busy */
403 if (rc < 0)
404 return rc;
405
406 if ((rc & 0x20) == 0) /* Ack? */
407 break;
408
409 /* I2C abort */
410 usbvision_write_reg(usbvision, USBVISION_SER_CONT, 0x00);
411
412 if (--retries < 0)
413 return -1;
414
415 }
416
417 if (i2c_debug & DBG_I2C) {
418 int idx;
419 for (idx = 0; idx < len; idx++) {
420 PDEBUG(DBG_I2C,"wrote %x at address %x", (unsigned char)buf[idx], addr);
421 }
422 }
423 return len;
424}
425
Thierry MERLE1ff16c22007-04-14 16:23:49 -0300426static int usbvision_i2c_write(struct usb_usbvision *usbvision, unsigned char addr, char *buf,
Thierry MERLE483dfdb2006-12-04 08:31:45 -0300427 short len)
428{
429 char *bufPtr = buf;
430 int retval;
431 int wrcount = 0;
432 int count;
433 int maxLen = 4;
Thierry MERLE483dfdb2006-12-04 08:31:45 -0300434
435 while (len > 0) {
436 count = (len > maxLen) ? maxLen : len;
437 retval = usbvision_i2c_write_max4(usbvision, addr, bufPtr, count);
438 if (retval > 0) {
439 len -= count;
440 bufPtr += count;
441 wrcount += count;
442 } else
443 return (retval < 0) ? retval : -EFAULT;
444 }
445 return wrcount;
446}
447
Thierry MERLE1ff16c22007-04-14 16:23:49 -0300448static int usbvision_i2c_read(struct usb_usbvision *usbvision, unsigned char addr, char *buf,
Thierry MERLE483dfdb2006-12-04 08:31:45 -0300449 short len)
450{
451 char temp[4];
452 int retval, i;
453 int rdcount = 0;
454 int count;
Thierry MERLE483dfdb2006-12-04 08:31:45 -0300455
456 while (len > 0) {
457 count = (len > 3) ? 4 : len;
458 retval = usbvision_i2c_read_max4(usbvision, addr, temp, count);
459 if (retval > 0) {
460 for (i = 0; i < len; i++)
461 buf[rdcount + i] = temp[i];
462 len -= count;
463 rdcount += count;
464 } else
465 return (retval < 0) ? retval : -EFAULT;
466 }
467 return rdcount;
468}
469
Thierry MERLE483dfdb2006-12-04 08:31:45 -0300470static struct i2c_adapter i2c_adap_template = {
471 .owner = THIS_MODULE,
472 .name = "usbvision",
Thierry MERLE483dfdb2006-12-04 08:31:45 -0300473};
474
Thierry MERLE483dfdb2006-12-04 08:31:45 -0300475/*
476 * Overrides for Emacs so that we follow Linus's tabbing style.
477 * ---------------------------------------------------------------------------
478 * Local variables:
479 * c-basic-offset: 8
480 * End:
481 */