391 lines
9.0 KiB
C
391 lines
9.0 KiB
C
|
/*
|
||
|
|
* Driver for the Auvitek AU0828 USB bridge
|
||
|
|
*
|
||
|
|
* Copyright (c) 2008 Steven Toth <stoth@linuxtv.org>
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License as published by
|
||
|
|
* the Free Software Foundation; either version 2 of the License, or
|
||
|
|
* (at your option) any later version.
|
||
|
|
*
|
||
|
|
* This program is distributed in the hope that it will be useful,
|
||
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
*
|
||
|
|
* GNU General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU General Public License
|
||
|
|
* along with this program; if not, write to the Free Software
|
||
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/moduleparam.h>
|
||
|
|
#include <linux/init.h>
|
||
|
|
#include <linux/delay.h>
|
||
|
|
#include <linux/io.h>
|
||
|
|
|
||
|
|
#include "au0828.h"
|
||
|
|
|
||
|
|
#include <media/v4l2-common.h>
|
||
|
|
|
||
|
|
static int i2c_scan;
|
||
|
|
module_param(i2c_scan, int, 0444);
|
||
|
|
MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");
|
||
|
|
|
||
|
|
#define I2C_WAIT_DELAY 512
|
||
|
|
#define I2C_WAIT_RETRY 64
|
||
|
|
|
||
|
|
static inline int i2c_slave_did_write_ack(struct i2c_adapter *i2c_adap)
|
||
|
|
{
|
||
|
|
struct au0828_dev *dev = i2c_adap->algo_data;
|
||
|
|
return au0828_read(dev, AU0828_I2C_STATUS_201) &
|
||
|
|
AU0828_I2C_STATUS_NO_WRITE_ACK ? 0 : 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int i2c_slave_did_read_ack(struct i2c_adapter *i2c_adap)
|
||
|
|
{
|
||
|
|
struct au0828_dev *dev = i2c_adap->algo_data;
|
||
|
|
return au0828_read(dev, AU0828_I2C_STATUS_201) &
|
||
|
|
AU0828_I2C_STATUS_NO_READ_ACK ? 0 : 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int i2c_wait_read_ack(struct i2c_adapter *i2c_adap)
|
||
|
|
{
|
||
|
|
int count;
|
||
|
|
|
||
|
|
for (count = 0; count < I2C_WAIT_RETRY; count++) {
|
||
|
|
if (!i2c_slave_did_read_ack(i2c_adap))
|
||
|
|
break;
|
||
|
|
udelay(I2C_WAIT_DELAY);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (I2C_WAIT_RETRY == count)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int i2c_is_read_busy(struct i2c_adapter *i2c_adap)
|
||
|
|
{
|
||
|
|
struct au0828_dev *dev = i2c_adap->algo_data;
|
||
|
|
return au0828_read(dev, AU0828_I2C_STATUS_201) &
|
||
|
|
AU0828_I2C_STATUS_READ_DONE ? 0 : 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int i2c_wait_read_done(struct i2c_adapter *i2c_adap)
|
||
|
|
{
|
||
|
|
int count;
|
||
|
|
|
||
|
|
for (count = 0; count < I2C_WAIT_RETRY; count++) {
|
||
|
|
if (!i2c_is_read_busy(i2c_adap))
|
||
|
|
break;
|
||
|
|
udelay(I2C_WAIT_DELAY);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (I2C_WAIT_RETRY == count)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int i2c_is_write_done(struct i2c_adapter *i2c_adap)
|
||
|
|
{
|
||
|
|
struct au0828_dev *dev = i2c_adap->algo_data;
|
||
|
|
return au0828_read(dev, AU0828_I2C_STATUS_201) &
|
||
|
|
AU0828_I2C_STATUS_WRITE_DONE ? 1 : 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int i2c_wait_write_done(struct i2c_adapter *i2c_adap)
|
||
|
|
{
|
||
|
|
int count;
|
||
|
|
|
||
|
|
for (count = 0; count < I2C_WAIT_RETRY; count++) {
|
||
|
|
if (i2c_is_write_done(i2c_adap))
|
||
|
|
break;
|
||
|
|
udelay(I2C_WAIT_DELAY);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (I2C_WAIT_RETRY == count)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int i2c_is_busy(struct i2c_adapter *i2c_adap)
|
||
|
|
{
|
||
|
|
struct au0828_dev *dev = i2c_adap->algo_data;
|
||
|
|
return au0828_read(dev, AU0828_I2C_STATUS_201) &
|
||
|
|
AU0828_I2C_STATUS_BUSY ? 1 : 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int i2c_wait_done(struct i2c_adapter *i2c_adap)
|
||
|
|
{
|
||
|
|
int count;
|
||
|
|
|
||
|
|
for (count = 0; count < I2C_WAIT_RETRY; count++) {
|
||
|
|
if (!i2c_is_busy(i2c_adap))
|
||
|
|
break;
|
||
|
|
udelay(I2C_WAIT_DELAY);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (I2C_WAIT_RETRY == count)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* FIXME: Implement join handling correctly */
|
||
|
|
static int i2c_sendbytes(struct i2c_adapter *i2c_adap,
|
||
|
|
const struct i2c_msg *msg, int joined_rlen)
|
||
|
|
{
|
||
|
|
int i, strobe = 0;
|
||
|
|
struct au0828_dev *dev = i2c_adap->algo_data;
|
||
|
|
|
||
|
|
dprintk(4, "%s()\n", __func__);
|
||
|
|
|
||
|
|
au0828_write(dev, AU0828_I2C_MULTIBYTE_MODE_2FF, 0x01);
|
||
|
|
|
||
|
|
/* Set the I2C clock */
|
||
|
|
au0828_write(dev, AU0828_I2C_CLK_DIVIDER_202,
|
||
|
|
dev->board.i2c_clk_divider);
|
||
|
|
|
||
|
|
/* Hardware needs 8 bit addresses */
|
||
|
|
au0828_write(dev, AU0828_I2C_DEST_ADDR_203, msg->addr << 1);
|
||
|
|
|
||
|
|
dprintk(4, "SEND: %02x\n", msg->addr);
|
||
|
|
|
||
|
|
/* Deal with i2c_scan */
|
||
|
|
if (msg->len == 0) {
|
||
|
|
/* The analog tuner detection code makes use of the SMBUS_QUICK
|
||
|
|
message (which involves a zero length i2c write). To avoid
|
||
|
|
checking the status register when we didn't strobe out any
|
||
|
|
actual bytes to the bus, just do a read check. This is
|
||
|
|
consistent with how I saw i2c device checking done in the
|
||
|
|
USB trace of the Windows driver */
|
||
|
|
au0828_write(dev, AU0828_I2C_TRIGGER_200,
|
||
|
|
AU0828_I2C_TRIGGER_READ);
|
||
|
|
|
||
|
|
if (!i2c_wait_done(i2c_adap))
|
||
|
|
return -EIO;
|
||
|
|
|
||
|
|
if (i2c_wait_read_ack(i2c_adap))
|
||
|
|
return -EIO;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
for (i = 0; i < msg->len;) {
|
||
|
|
|
||
|
|
dprintk(4, " %02x\n", msg->buf[i]);
|
||
|
|
|
||
|
|
au0828_write(dev, AU0828_I2C_WRITE_FIFO_205, msg->buf[i]);
|
||
|
|
|
||
|
|
strobe++;
|
||
|
|
i++;
|
||
|
|
|
||
|
|
if ((strobe >= 4) || (i >= msg->len)) {
|
||
|
|
|
||
|
|
/* Strobe the byte into the bus */
|
||
|
|
if (i < msg->len)
|
||
|
|
au0828_write(dev, AU0828_I2C_TRIGGER_200,
|
||
|
|
AU0828_I2C_TRIGGER_WRITE |
|
||
|
|
AU0828_I2C_TRIGGER_HOLD);
|
||
|
|
else
|
||
|
|
au0828_write(dev, AU0828_I2C_TRIGGER_200,
|
||
|
|
AU0828_I2C_TRIGGER_WRITE);
|
||
|
|
|
||
|
|
/* Reset strobe trigger */
|
||
|
|
strobe = 0;
|
||
|
|
|
||
|
|
if (!i2c_wait_write_done(i2c_adap))
|
||
|
|
return -EIO;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
if (!i2c_wait_done(i2c_adap))
|
||
|
|
return -EIO;
|
||
|
|
|
||
|
|
dprintk(4, "\n");
|
||
|
|
|
||
|
|
return msg->len;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* FIXME: Implement join handling correctly */
|
||
|
|
static int i2c_readbytes(struct i2c_adapter *i2c_adap,
|
||
|
|
const struct i2c_msg *msg, int joined)
|
||
|
|
{
|
||
|
|
struct au0828_dev *dev = i2c_adap->algo_data;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
dprintk(4, "%s()\n", __func__);
|
||
|
|
|
||
|
|
au0828_write(dev, AU0828_I2C_MULTIBYTE_MODE_2FF, 0x01);
|
||
|
|
|
||
|
|
/* Set the I2C clock */
|
||
|
|
au0828_write(dev, AU0828_I2C_CLK_DIVIDER_202,
|
||
|
|
dev->board.i2c_clk_divider);
|
||
|
|
|
||
|
|
/* Hardware needs 8 bit addresses */
|
||
|
|
au0828_write(dev, AU0828_I2C_DEST_ADDR_203, msg->addr << 1);
|
||
|
|
|
||
|
|
dprintk(4, " RECV:\n");
|
||
|
|
|
||
|
|
/* Deal with i2c_scan */
|
||
|
|
if (msg->len == 0) {
|
||
|
|
au0828_write(dev, AU0828_I2C_TRIGGER_200,
|
||
|
|
AU0828_I2C_TRIGGER_READ);
|
||
|
|
|
||
|
|
if (i2c_wait_read_ack(i2c_adap))
|
||
|
|
return -EIO;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
for (i = 0; i < msg->len;) {
|
||
|
|
|
||
|
|
i++;
|
||
|
|
|
||
|
|
if (i < msg->len)
|
||
|
|
au0828_write(dev, AU0828_I2C_TRIGGER_200,
|
||
|
|
AU0828_I2C_TRIGGER_READ |
|
||
|
|
AU0828_I2C_TRIGGER_HOLD);
|
||
|
|
else
|
||
|
|
au0828_write(dev, AU0828_I2C_TRIGGER_200,
|
||
|
|
AU0828_I2C_TRIGGER_READ);
|
||
|
|
|
||
|
|
if (!i2c_wait_read_done(i2c_adap))
|
||
|
|
return -EIO;
|
||
|
|
|
||
|
|
msg->buf[i-1] = au0828_read(dev, AU0828_I2C_READ_FIFO_209) &
|
||
|
|
0xff;
|
||
|
|
|
||
|
|
dprintk(4, " %02x\n", msg->buf[i-1]);
|
||
|
|
}
|
||
|
|
if (!i2c_wait_done(i2c_adap))
|
||
|
|
return -EIO;
|
||
|
|
|
||
|
|
dprintk(4, "\n");
|
||
|
|
|
||
|
|
return msg->len;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int i2c_xfer(struct i2c_adapter *i2c_adap,
|
||
|
|
struct i2c_msg *msgs, int num)
|
||
|
|
{
|
||
|
|
int i, retval = 0;
|
||
|
|
|
||
|
|
dprintk(4, "%s(num = %d)\n", __func__, num);
|
||
|
|
|
||
|
|
for (i = 0; i < num; i++) {
|
||
|
|
dprintk(4, "%s(num = %d) addr = 0x%02x len = 0x%x\n",
|
||
|
|
__func__, num, msgs[i].addr, msgs[i].len);
|
||
|
|
if (msgs[i].flags & I2C_M_RD) {
|
||
|
|
/* read */
|
||
|
|
retval = i2c_readbytes(i2c_adap, &msgs[i], 0);
|
||
|
|
} else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) &&
|
||
|
|
msgs[i].addr == msgs[i + 1].addr) {
|
||
|
|
/* write then read from same address */
|
||
|
|
retval = i2c_sendbytes(i2c_adap, &msgs[i],
|
||
|
|
msgs[i + 1].len);
|
||
|
|
if (retval < 0)
|
||
|
|
goto err;
|
||
|
|
i++;
|
||
|
|
retval = i2c_readbytes(i2c_adap, &msgs[i], 1);
|
||
|
|
} else {
|
||
|
|
/* write */
|
||
|
|
retval = i2c_sendbytes(i2c_adap, &msgs[i], 0);
|
||
|
|
}
|
||
|
|
if (retval < 0)
|
||
|
|
goto err;
|
||
|
|
}
|
||
|
|
return num;
|
||
|
|
|
||
|
|
err:
|
||
|
|
return retval;
|
||
|
|
}
|
||
|
|
|
||
|
|
static u32 au0828_functionality(struct i2c_adapter *adap)
|
||
|
|
{
|
||
|
|
return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct i2c_algorithm au0828_i2c_algo_template = {
|
||
|
|
.master_xfer = i2c_xfer,
|
||
|
|
.functionality = au0828_functionality,
|
||
|
|
};
|
||
|
|
|
||
|
|
/* ----------------------------------------------------------------------- */
|
||
|
|
|
||
|
|
static struct i2c_adapter au0828_i2c_adap_template = {
|
||
|
|
.name = DRIVER_NAME,
|
||
|
|
.owner = THIS_MODULE,
|
||
|
|
.algo = &au0828_i2c_algo_template,
|
||
|
|
};
|
||
|
|
|
||
|
|
static struct i2c_client au0828_i2c_client_template = {
|
||
|
|
.name = "au0828 internal",
|
||
|
|
};
|
||
|
|
|
||
|
|
static char *i2c_devs[128] = {
|
||
|
|
[0x8e >> 1] = "au8522",
|
||
|
|
[0xa0 >> 1] = "eeprom",
|
||
|
|
[0xc2 >> 1] = "tuner/xc5000",
|
||
|
|
};
|
||
|
|
|
||
|
|
static void do_i2c_scan(char *name, struct i2c_client *c)
|
||
|
|
{
|
||
|
|
unsigned char buf;
|
||
|
|
int i, rc;
|
||
|
|
|
||
|
|
for (i = 0; i < 128; i++) {
|
||
|
|
c->addr = i;
|
||
|
|
rc = i2c_master_recv(c, &buf, 0);
|
||
|
|
if (rc < 0)
|
||
|
|
continue;
|
||
|
|
printk(KERN_INFO "%s: i2c scan: found device @ 0x%x [%s]\n",
|
||
|
|
name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* init + register i2c algo-bit adapter */
|
||
|
|
int au0828_i2c_register(struct au0828_dev *dev)
|
||
|
|
{
|
||
|
|
dprintk(1, "%s()\n", __func__);
|
||
|
|
|
||
|
|
memcpy(&dev->i2c_adap, &au0828_i2c_adap_template,
|
||
|
|
sizeof(dev->i2c_adap));
|
||
|
|
memcpy(&dev->i2c_algo, &au0828_i2c_algo_template,
|
||
|
|
sizeof(dev->i2c_algo));
|
||
|
|
memcpy(&dev->i2c_client, &au0828_i2c_client_template,
|
||
|
|
sizeof(dev->i2c_client));
|
||
|
|
|
||
|
|
dev->i2c_adap.dev.parent = &dev->usbdev->dev;
|
||
|
|
|
||
|
|
strlcpy(dev->i2c_adap.name, DRIVER_NAME,
|
||
|
|
sizeof(dev->i2c_adap.name));
|
||
|
|
|
||
|
|
dev->i2c_adap.algo = &dev->i2c_algo;
|
||
|
|
dev->i2c_adap.algo_data = dev;
|
||
|
|
i2c_set_adapdata(&dev->i2c_adap, &dev->v4l2_dev);
|
||
|
|
i2c_add_adapter(&dev->i2c_adap);
|
||
|
|
|
||
|
|
dev->i2c_client.adapter = &dev->i2c_adap;
|
||
|
|
|
||
|
|
if (0 == dev->i2c_rc) {
|
||
|
|
printk(KERN_INFO "%s: i2c bus registered\n", DRIVER_NAME);
|
||
|
|
if (i2c_scan)
|
||
|
|
do_i2c_scan(DRIVER_NAME, &dev->i2c_client);
|
||
|
|
} else
|
||
|
|
printk(KERN_INFO "%s: i2c bus register FAILED\n", DRIVER_NAME);
|
||
|
|
|
||
|
|
return dev->i2c_rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
int au0828_i2c_unregister(struct au0828_dev *dev)
|
||
|
|
{
|
||
|
|
i2c_del_adapter(&dev->i2c_adap);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|