382 lines
8.4 KiB
C
382 lines
8.4 KiB
C
/*
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* Driver for the Auvitek AU0828 USB bridge
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*
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* Copyright (c) 2008 Steven Toth <stoth@linuxtv.org>
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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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*
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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/module.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/io.h>
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#include "au0828.h"
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#include <media/v4l2-common.h>
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static int i2c_scan;
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module_param(i2c_scan, int, 0444);
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MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");
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#define I2C_WAIT_DELAY 512
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#define I2C_WAIT_RETRY 64
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static inline int i2c_slave_did_write_ack(struct i2c_adapter *i2c_adap)
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{
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struct au0828_dev *dev = i2c_adap->algo_data;
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return au0828_read(dev, REG_201) & 0x08 ? 0 : 1;
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}
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static inline int i2c_slave_did_read_ack(struct i2c_adapter *i2c_adap)
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{
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struct au0828_dev *dev = i2c_adap->algo_data;
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return au0828_read(dev, REG_201) & 0x02 ? 0 : 1;
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}
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static int i2c_wait_read_ack(struct i2c_adapter *i2c_adap)
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{
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int count;
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for (count = 0; count < I2C_WAIT_RETRY; count++) {
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if (!i2c_slave_did_read_ack(i2c_adap))
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break;
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udelay(I2C_WAIT_DELAY);
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}
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if (I2C_WAIT_RETRY == count)
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return 0;
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return 1;
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}
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static inline int i2c_is_read_busy(struct i2c_adapter *i2c_adap)
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{
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struct au0828_dev *dev = i2c_adap->algo_data;
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return au0828_read(dev, REG_201) & 0x01 ? 0 : 1;
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}
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static int i2c_wait_read_done(struct i2c_adapter *i2c_adap)
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{
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int count;
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for (count = 0; count < I2C_WAIT_RETRY; count++) {
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if (!i2c_is_read_busy(i2c_adap))
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break;
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udelay(I2C_WAIT_DELAY);
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}
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if (I2C_WAIT_RETRY == count)
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return 0;
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return 1;
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}
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static inline int i2c_is_write_done(struct i2c_adapter *i2c_adap)
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{
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struct au0828_dev *dev = i2c_adap->algo_data;
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return au0828_read(dev, REG_201) & 0x04 ? 1 : 0;
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}
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static int i2c_wait_write_done(struct i2c_adapter *i2c_adap)
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{
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int count;
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for (count = 0; count < I2C_WAIT_RETRY; count++) {
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if (i2c_is_write_done(i2c_adap))
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break;
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udelay(I2C_WAIT_DELAY);
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}
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if (I2C_WAIT_RETRY == count)
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return 0;
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return 1;
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}
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static inline int i2c_is_busy(struct i2c_adapter *i2c_adap)
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{
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struct au0828_dev *dev = i2c_adap->algo_data;
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return au0828_read(dev, REG_201) & 0x10 ? 1 : 0;
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}
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static int i2c_wait_done(struct i2c_adapter *i2c_adap)
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{
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int count;
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for (count = 0; count < I2C_WAIT_RETRY; count++) {
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if (!i2c_is_busy(i2c_adap))
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break;
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udelay(I2C_WAIT_DELAY);
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}
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if (I2C_WAIT_RETRY == count)
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return 0;
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return 1;
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}
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/* FIXME: Implement join handling correctly */
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static int i2c_sendbytes(struct i2c_adapter *i2c_adap,
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const struct i2c_msg *msg, int joined_rlen)
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{
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int i, strobe = 0;
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struct au0828_dev *dev = i2c_adap->algo_data;
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dprintk(4, "%s()\n", __func__);
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au0828_write(dev, REG_2FF, 0x01);
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au0828_write(dev, REG_202, 0x07);
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/* Hardware needs 8 bit addresses */
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au0828_write(dev, REG_203, msg->addr << 1);
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dprintk(4, "SEND: %02x\n", msg->addr);
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for (i = 0; i < msg->len;) {
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dprintk(4, " %02x\n", msg->buf[i]);
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au0828_write(dev, REG_205, msg->buf[i]);
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strobe++;
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i++;
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if ((strobe >= 4) || (i >= msg->len)) {
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/* Strobe the byte into the bus */
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if (i < msg->len)
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au0828_write(dev, REG_200, 0x41);
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else
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au0828_write(dev, REG_200, 0x01);
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/* Reset strobe trigger */
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strobe = 0;
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if (!i2c_wait_write_done(i2c_adap))
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return -EIO;
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}
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}
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if (!i2c_wait_done(i2c_adap))
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return -EIO;
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dprintk(4, "\n");
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return msg->len;
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}
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/* FIXME: Implement join handling correctly */
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static int i2c_readbytes(struct i2c_adapter *i2c_adap,
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const struct i2c_msg *msg, int joined)
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{
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struct au0828_dev *dev = i2c_adap->algo_data;
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int i;
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dprintk(4, "%s()\n", __func__);
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au0828_write(dev, REG_2FF, 0x01);
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au0828_write(dev, REG_202, 0x07);
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/* Hardware needs 8 bit addresses */
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au0828_write(dev, REG_203, msg->addr << 1);
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dprintk(4, " RECV:\n");
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/* Deal with i2c_scan */
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if (msg->len == 0) {
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au0828_write(dev, REG_200, 0x20);
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if (i2c_wait_read_ack(i2c_adap))
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return -EIO;
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return 0;
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}
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for (i = 0; i < msg->len;) {
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i++;
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if (i < msg->len)
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au0828_write(dev, REG_200, 0x60);
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else
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au0828_write(dev, REG_200, 0x20);
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if (!i2c_wait_read_done(i2c_adap))
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return -EIO;
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msg->buf[i-1] = au0828_read(dev, REG_209) & 0xff;
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dprintk(4, " %02x\n", msg->buf[i-1]);
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}
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if (!i2c_wait_done(i2c_adap))
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return -EIO;
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dprintk(4, "\n");
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return msg->len;
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}
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static int i2c_xfer(struct i2c_adapter *i2c_adap,
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struct i2c_msg *msgs, int num)
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{
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int i, retval = 0;
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dprintk(4, "%s(num = %d)\n", __func__, num);
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for (i = 0; i < num; i++) {
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dprintk(4, "%s(num = %d) addr = 0x%02x len = 0x%x\n",
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__func__, num, msgs[i].addr, msgs[i].len);
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if (msgs[i].flags & I2C_M_RD) {
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/* read */
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retval = i2c_readbytes(i2c_adap, &msgs[i], 0);
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} else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) &&
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msgs[i].addr == msgs[i + 1].addr) {
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/* write then read from same address */
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retval = i2c_sendbytes(i2c_adap, &msgs[i],
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msgs[i + 1].len);
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if (retval < 0)
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goto err;
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i++;
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retval = i2c_readbytes(i2c_adap, &msgs[i], 1);
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} else {
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/* write */
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retval = i2c_sendbytes(i2c_adap, &msgs[i], 0);
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}
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if (retval < 0)
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goto err;
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}
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return num;
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err:
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return retval;
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}
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static int attach_inform(struct i2c_client *client)
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{
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dprintk(1, "%s i2c attach [addr=0x%x,client=%s]\n",
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client->driver->driver.name, client->addr, client->name);
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if (!client->driver->command)
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return 0;
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return 0;
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}
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static int detach_inform(struct i2c_client *client)
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{
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dprintk(1, "i2c detach [client=%s]\n", client->name);
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return 0;
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}
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void au0828_call_i2c_clients(struct au0828_dev *dev,
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unsigned int cmd, void *arg)
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{
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if (dev->i2c_rc != 0)
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return;
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i2c_clients_command(&dev->i2c_adap, cmd, arg);
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}
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static u32 au0828_functionality(struct i2c_adapter *adap)
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{
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return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C;
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}
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static struct i2c_algorithm au0828_i2c_algo_template = {
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.master_xfer = i2c_xfer,
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.functionality = au0828_functionality,
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};
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/* ----------------------------------------------------------------------- */
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static struct i2c_adapter au0828_i2c_adap_template = {
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.name = DRIVER_NAME,
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.owner = THIS_MODULE,
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.id = I2C_HW_B_AU0828,
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.algo = &au0828_i2c_algo_template,
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.class = I2C_CLASS_TV_ANALOG,
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.client_register = attach_inform,
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.client_unregister = detach_inform,
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};
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static struct i2c_client au0828_i2c_client_template = {
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.name = "au0828 internal",
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};
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static char *i2c_devs[128] = {
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[0x8e >> 1] = "au8522",
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[0xa0 >> 1] = "eeprom",
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[0xc2 >> 1] = "tuner/xc5000",
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};
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static void do_i2c_scan(char *name, struct i2c_client *c)
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{
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unsigned char buf;
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int i, rc;
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for (i = 0; i < 128; i++) {
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c->addr = i;
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rc = i2c_master_recv(c, &buf, 0);
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if (rc < 0)
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continue;
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printk(KERN_INFO "%s: i2c scan: found device @ 0x%x [%s]\n",
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name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
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}
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}
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/* init + register i2c algo-bit adapter */
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int au0828_i2c_register(struct au0828_dev *dev)
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{
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dprintk(1, "%s()\n", __func__);
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memcpy(&dev->i2c_adap, &au0828_i2c_adap_template,
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sizeof(dev->i2c_adap));
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memcpy(&dev->i2c_algo, &au0828_i2c_algo_template,
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sizeof(dev->i2c_algo));
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memcpy(&dev->i2c_client, &au0828_i2c_client_template,
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sizeof(dev->i2c_client));
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dev->i2c_adap.dev.parent = &dev->usbdev->dev;
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strlcpy(dev->i2c_adap.name, DRIVER_NAME,
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sizeof(dev->i2c_adap.name));
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dev->i2c_algo.data = dev;
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dev->i2c_adap.algo_data = dev;
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i2c_set_adapdata(&dev->i2c_adap, dev);
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i2c_add_adapter(&dev->i2c_adap);
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dev->i2c_client.adapter = &dev->i2c_adap;
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if (0 == dev->i2c_rc) {
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printk(KERN_INFO "%s: i2c bus registered\n", DRIVER_NAME);
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if (i2c_scan)
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do_i2c_scan(DRIVER_NAME, &dev->i2c_client);
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} else
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printk(KERN_INFO "%s: i2c bus register FAILED\n", DRIVER_NAME);
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return dev->i2c_rc;
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}
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int au0828_i2c_unregister(struct au0828_dev *dev)
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{
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i2c_del_adapter(&dev->i2c_adap);
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return 0;
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}
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