forked from Minki/linux
8403472f19
Removed the BKL from usbvision. There was an initialization bug as well where the i2c bus was registered twice. Although when the BKL was present no oops was generated, I did run into other i2c problems. Now that I protect against duplicate i2c registration that bug is now gone as well. But trying to disconnect the USB cable while someone is still using the device still leads to a crash. Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
482 lines
12 KiB
C
482 lines
12 KiB
C
/*
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* usbvision_i2c.c
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* i2c algorithm for USB-I2C Bridges
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*
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* Copyright (c) 1999-2007 Joerg Heckenbach <joerg@heckenbach-aw.de>
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* Dwaine Garden <dwainegarden@rogers.com>
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*
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* This module is part of usbvision driver project.
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* Updates to driver completed by Dwaine P. Garden
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <asm/uaccess.h>
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#include <linux/ioport.h>
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#include <linux/errno.h>
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#include <linux/usb.h>
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#include <linux/i2c.h>
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#include "usbvision.h"
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#define DBG_I2C 1<<0
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static int i2c_debug;
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module_param (i2c_debug, int, 0644); // debug_i2c_usb mode of the device driver
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MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
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#define PDEBUG(level, fmt, args...) { \
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if (i2c_debug & (level)) \
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printk(KERN_INFO KBUILD_MODNAME ":[%s:%d] " fmt, \
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__func__, __LINE__ , ## args); \
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}
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static int usbvision_i2c_write(struct usb_usbvision *usbvision, unsigned char addr, char *buf,
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short len);
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static int usbvision_i2c_read(struct usb_usbvision *usbvision, unsigned char addr, char *buf,
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short len);
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static inline int try_write_address(struct i2c_adapter *i2c_adap,
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unsigned char addr, int retries)
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{
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struct usb_usbvision *usbvision;
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int i, ret = -1;
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char buf[4];
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usbvision = (struct usb_usbvision *)i2c_get_adapdata(i2c_adap);
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buf[0] = 0x00;
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for (i = 0; i <= retries; i++) {
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ret = (usbvision_i2c_write(usbvision, addr, buf, 1));
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if (ret == 1)
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break; /* success! */
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udelay(5);
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if (i == retries) /* no success */
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break;
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udelay(10);
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}
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if (i) {
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PDEBUG(DBG_I2C,"Needed %d retries for address %#2x", i, addr);
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PDEBUG(DBG_I2C,"Maybe there's no device at this address");
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}
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return ret;
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}
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static inline int try_read_address(struct i2c_adapter *i2c_adap,
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unsigned char addr, int retries)
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{
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struct usb_usbvision *usbvision;
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int i, ret = -1;
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char buf[4];
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usbvision = (struct usb_usbvision *)i2c_get_adapdata(i2c_adap);
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for (i = 0; i <= retries; i++) {
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ret = (usbvision_i2c_read(usbvision, addr, buf, 1));
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if (ret == 1)
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break; /* success! */
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udelay(5);
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if (i == retries) /* no success */
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break;
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udelay(10);
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}
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if (i) {
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PDEBUG(DBG_I2C,"Needed %d retries for address %#2x", i, addr);
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PDEBUG(DBG_I2C,"Maybe there's no device at this address");
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}
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return ret;
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}
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static inline int usb_find_address(struct i2c_adapter *i2c_adap,
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struct i2c_msg *msg, int retries,
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unsigned char *add)
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{
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unsigned short flags = msg->flags;
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unsigned char addr;
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int ret;
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if ((flags & I2C_M_TEN)) {
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/* a ten bit address */
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addr = 0xf0 | ((msg->addr >> 7) & 0x03);
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/* try extended address code... */
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ret = try_write_address(i2c_adap, addr, retries);
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if (ret != 1) {
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dev_err(&i2c_adap->dev,
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"died at extended address code, while writing\n");
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return -EREMOTEIO;
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}
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add[0] = addr;
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if (flags & I2C_M_RD) {
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/* okay, now switch into reading mode */
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addr |= 0x01;
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ret = try_read_address(i2c_adap, addr, retries);
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if (ret != 1) {
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dev_err(&i2c_adap->dev,
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"died at extended address code, while reading\n");
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return -EREMOTEIO;
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}
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}
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} else { /* normal 7bit address */
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addr = (msg->addr << 1);
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if (flags & I2C_M_RD)
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addr |= 1;
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add[0] = addr;
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if (flags & I2C_M_RD)
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ret = try_read_address(i2c_adap, addr, retries);
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else
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ret = try_write_address(i2c_adap, addr, retries);
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if (ret != 1) {
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return -EREMOTEIO;
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}
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}
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return 0;
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}
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static int
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usbvision_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg msgs[], int num)
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{
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struct i2c_msg *pmsg;
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struct usb_usbvision *usbvision;
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int i, ret;
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unsigned char addr = 0;
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usbvision = (struct usb_usbvision *)i2c_get_adapdata(i2c_adap);
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for (i = 0; i < num; i++) {
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pmsg = &msgs[i];
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ret = usb_find_address(i2c_adap, pmsg, i2c_adap->retries, &addr);
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if (ret != 0) {
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PDEBUG(DBG_I2C,"got NAK from device, message #%d", i);
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return (ret < 0) ? ret : -EREMOTEIO;
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}
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if (pmsg->flags & I2C_M_RD) {
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/* read bytes into buffer */
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ret = (usbvision_i2c_read(usbvision, addr, pmsg->buf, pmsg->len));
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if (ret < pmsg->len) {
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return (ret < 0) ? ret : -EREMOTEIO;
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}
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} else {
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/* write bytes from buffer */
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ret = (usbvision_i2c_write(usbvision, addr, pmsg->buf, pmsg->len));
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if (ret < pmsg->len) {
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return (ret < 0) ? ret : -EREMOTEIO;
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}
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}
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}
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return num;
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}
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static u32 functionality(struct i2c_adapter *adap)
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{
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return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_10BIT_ADDR;
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}
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/* -----exported algorithm data: ------------------------------------- */
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static struct i2c_algorithm usbvision_algo = {
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.master_xfer = usbvision_i2c_xfer,
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.smbus_xfer = NULL,
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.functionality = functionality,
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};
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/* ----------------------------------------------------------------------- */
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/* usbvision specific I2C functions */
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/* ----------------------------------------------------------------------- */
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static struct i2c_adapter i2c_adap_template;
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int usbvision_i2c_register(struct usb_usbvision *usbvision)
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{
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static unsigned short saa711x_addrs[] = {
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0x4a >> 1, 0x48 >> 1, /* SAA7111, SAA7111A and SAA7113 */
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0x42 >> 1, 0x40 >> 1, /* SAA7114, SAA7115 and SAA7118 */
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I2C_CLIENT_END };
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if (usbvision->registered_i2c)
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return 0;
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memcpy(&usbvision->i2c_adap, &i2c_adap_template,
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sizeof(struct i2c_adapter));
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sprintf(usbvision->i2c_adap.name, "%s-%d-%s", i2c_adap_template.name,
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usbvision->dev->bus->busnum, usbvision->dev->devpath);
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PDEBUG(DBG_I2C,"Adaptername: %s", usbvision->i2c_adap.name);
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usbvision->i2c_adap.dev.parent = &usbvision->dev->dev;
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i2c_set_adapdata(&usbvision->i2c_adap, &usbvision->v4l2_dev);
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if (usbvision_write_reg(usbvision, USBVISION_SER_MODE, USBVISION_IIC_LRNACK) < 0) {
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printk(KERN_ERR "usbvision_register: can't write reg\n");
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return -EBUSY;
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}
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PDEBUG(DBG_I2C, "I2C debugging is enabled [i2c]");
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PDEBUG(DBG_I2C, "ALGO debugging is enabled [i2c]");
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/* register new adapter to i2c module... */
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usbvision->i2c_adap.algo = &usbvision_algo;
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usbvision->i2c_adap.timeout = 100; /* default values, should */
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usbvision->i2c_adap.retries = 3; /* be replaced by defines */
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i2c_add_adapter(&usbvision->i2c_adap);
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PDEBUG(DBG_I2C, "i2c bus for %s registered", usbvision->i2c_adap.name);
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/* Request the load of the i2c modules we need */
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switch (usbvision_device_data[usbvision->DevModel].Codec) {
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case CODEC_SAA7113:
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case CODEC_SAA7111:
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/* Without this delay the detection of the saa711x is
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hit-and-miss. */
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mdelay(10);
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v4l2_i2c_new_subdev(&usbvision->v4l2_dev,
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&usbvision->i2c_adap, "saa7115",
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"saa7115_auto", 0, saa711x_addrs);
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break;
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}
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if (usbvision_device_data[usbvision->DevModel].Tuner == 1) {
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struct v4l2_subdev *sd;
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enum v4l2_i2c_tuner_type type;
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struct tuner_setup tun_setup;
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sd = v4l2_i2c_new_subdev(&usbvision->v4l2_dev,
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&usbvision->i2c_adap, "tuner",
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"tuner", 0, v4l2_i2c_tuner_addrs(ADDRS_DEMOD));
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/* depending on whether we found a demod or not, select
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the tuner type. */
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type = sd ? ADDRS_TV_WITH_DEMOD : ADDRS_TV;
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sd = v4l2_i2c_new_subdev(&usbvision->v4l2_dev,
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&usbvision->i2c_adap, "tuner",
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"tuner", 0, v4l2_i2c_tuner_addrs(type));
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if (sd == NULL)
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return -ENODEV;
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if (usbvision->tuner_type != -1) {
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tun_setup.mode_mask = T_ANALOG_TV | T_RADIO;
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tun_setup.type = usbvision->tuner_type;
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tun_setup.addr = v4l2_i2c_subdev_addr(sd);
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call_all(usbvision, tuner, s_type_addr, &tun_setup);
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}
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}
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usbvision->registered_i2c = 1;
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return 0;
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}
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int usbvision_i2c_unregister(struct usb_usbvision *usbvision)
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{
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if (!usbvision->registered_i2c)
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return 0;
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i2c_del_adapter(&(usbvision->i2c_adap));
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usbvision->registered_i2c = 0;
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PDEBUG(DBG_I2C,"i2c bus for %s unregistered", usbvision->i2c_adap.name);
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return 0;
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}
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static int
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usbvision_i2c_read_max4(struct usb_usbvision *usbvision, unsigned char addr,
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char *buf, short len)
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{
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int rc, retries;
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for (retries = 5;;) {
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rc = usbvision_write_reg(usbvision, USBVISION_SER_ADRS, addr);
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if (rc < 0)
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return rc;
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/* Initiate byte read cycle */
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/* USBVISION_SER_CONT <- d0-d2 n. of bytes to r/w */
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/* d3 0=Wr 1=Rd */
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rc = usbvision_write_reg(usbvision, USBVISION_SER_CONT,
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(len & 0x07) | 0x18);
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if (rc < 0)
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return rc;
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/* Test for Busy and ACK */
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do {
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/* USBVISION_SER_CONT -> d4 == 0 busy */
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rc = usbvision_read_reg(usbvision, USBVISION_SER_CONT);
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} while (rc > 0 && ((rc & 0x10) != 0)); /* Retry while busy */
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if (rc < 0)
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return rc;
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/* USBVISION_SER_CONT -> d5 == 1 Not ack */
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if ((rc & 0x20) == 0) /* Ack? */
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break;
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/* I2C abort */
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rc = usbvision_write_reg(usbvision, USBVISION_SER_CONT, 0x00);
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if (rc < 0)
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return rc;
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if (--retries < 0)
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return -1;
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}
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switch (len) {
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case 4:
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buf[3] = usbvision_read_reg(usbvision, USBVISION_SER_DAT4);
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case 3:
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buf[2] = usbvision_read_reg(usbvision, USBVISION_SER_DAT3);
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case 2:
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buf[1] = usbvision_read_reg(usbvision, USBVISION_SER_DAT2);
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case 1:
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buf[0] = usbvision_read_reg(usbvision, USBVISION_SER_DAT1);
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break;
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default:
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printk(KERN_ERR
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"usbvision_i2c_read_max4: buffer length > 4\n");
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}
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if (i2c_debug & DBG_I2C) {
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int idx;
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for (idx = 0; idx < len; idx++) {
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PDEBUG(DBG_I2C,"read %x from address %x", (unsigned char)buf[idx], addr);
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}
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}
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return len;
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}
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static int usbvision_i2c_write_max4(struct usb_usbvision *usbvision,
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unsigned char addr, const char *buf,
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short len)
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{
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int rc, retries;
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int i;
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unsigned char value[6];
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unsigned char ser_cont;
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ser_cont = (len & 0x07) | 0x10;
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value[0] = addr;
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value[1] = ser_cont;
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for (i = 0; i < len; i++)
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value[i + 2] = buf[i];
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for (retries = 5;;) {
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rc = usb_control_msg(usbvision->dev,
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usb_sndctrlpipe(usbvision->dev, 1),
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USBVISION_OP_CODE,
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USB_DIR_OUT | USB_TYPE_VENDOR |
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USB_RECIP_ENDPOINT, 0,
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(__u16) USBVISION_SER_ADRS, value,
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len + 2, HZ);
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if (rc < 0)
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return rc;
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rc = usbvision_write_reg(usbvision, USBVISION_SER_CONT,
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(len & 0x07) | 0x10);
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if (rc < 0)
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return rc;
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/* Test for Busy and ACK */
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do {
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rc = usbvision_read_reg(usbvision, USBVISION_SER_CONT);
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} while (rc > 0 && ((rc & 0x10) != 0)); /* Retry while busy */
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if (rc < 0)
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return rc;
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if ((rc & 0x20) == 0) /* Ack? */
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break;
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/* I2C abort */
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usbvision_write_reg(usbvision, USBVISION_SER_CONT, 0x00);
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if (--retries < 0)
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return -1;
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}
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if (i2c_debug & DBG_I2C) {
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int idx;
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for (idx = 0; idx < len; idx++) {
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PDEBUG(DBG_I2C,"wrote %x at address %x", (unsigned char)buf[idx], addr);
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}
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}
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return len;
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}
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static int usbvision_i2c_write(struct usb_usbvision *usbvision, unsigned char addr, char *buf,
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short len)
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{
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char *bufPtr = buf;
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int retval;
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int wrcount = 0;
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int count;
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int maxLen = 4;
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while (len > 0) {
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count = (len > maxLen) ? maxLen : len;
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retval = usbvision_i2c_write_max4(usbvision, addr, bufPtr, count);
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if (retval > 0) {
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len -= count;
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bufPtr += count;
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wrcount += count;
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} else
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return (retval < 0) ? retval : -EFAULT;
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}
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return wrcount;
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}
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static int usbvision_i2c_read(struct usb_usbvision *usbvision, unsigned char addr, char *buf,
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short len)
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{
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char temp[4];
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int retval, i;
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int rdcount = 0;
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int count;
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while (len > 0) {
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count = (len > 3) ? 4 : len;
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retval = usbvision_i2c_read_max4(usbvision, addr, temp, count);
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if (retval > 0) {
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for (i = 0; i < len; i++)
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buf[rdcount + i] = temp[i];
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len -= count;
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rdcount += count;
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} else
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return (retval < 0) ? retval : -EFAULT;
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}
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return rdcount;
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}
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static struct i2c_adapter i2c_adap_template = {
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.owner = THIS_MODULE,
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.name = "usbvision",
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};
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/*
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* Overrides for Emacs so that we follow Linus's tabbing style.
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* ---------------------------------------------------------------------------
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* Local variables:
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* c-basic-offset: 8
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* End:
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*/
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