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linux/drivers/media/video/au0828/au0828-i2c.c
Adrian Bunk b33d24c4cc V4L/DVB (7750): au0828/ cleanups and fixes 
This patch contains the following cleanups and fixes:
- "debug" is definitely not a good name for a global variable,
  renamed it to "au0828_debug"
  this fixes a compile error with some kernel configurations
- since the module parameter is int the variable shouldn't be unsigned
- remove the {usb,bridge,i2c}_debug module parameters since they are
  already covered by the "debug" module parameter
- remove the unused au0828_bcount
- make the needlessly global i2c_scan static
- make the needlessly global dvb_register() static

Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-04-26 09:29:57 -03:00

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/*
* Driver for the Auvitek AU0828 USB bridge
*
* Copyright (c) 2008 Steven Toth <stoth@hauppauge.com>
*
* 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, REG_201) & 0x08 ? 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, REG_201) & 0x02 ? 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, REG_201) & 0x01 ? 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, REG_201) & 0x04 ? 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, REG_201) & 0x10 ? 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, REG_2FF, 0x01);
au0828_write(dev, REG_202, 0x07);
/* Hardware needs 8 bit addresses */
au0828_write(dev, REG_203, msg->addr << 1);
dprintk(4, "SEND: %02x\n", msg->addr);
for (i = 0; i < msg->len;) {
dprintk(4, " %02x\n", msg->buf[i]);
au0828_write(dev, REG_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, REG_200, 0x41);
else
au0828_write(dev, REG_200, 0x01);
/* 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, REG_2FF, 0x01);
au0828_write(dev, REG_202, 0x07);
/* Hardware needs 8 bit addresses */
au0828_write(dev, REG_203, msg->addr << 1);
dprintk(4, " RECV:\n");
/* Deal with i2c_scan */
if (msg->len == 0) {
au0828_write(dev, REG_200, 0x20);
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, REG_200, 0x60);
else
au0828_write(dev, REG_200, 0x20);
if (!i2c_wait_read_done(i2c_adap))
return -EIO;
msg->buf[i-1] = au0828_read(dev, REG_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 int attach_inform(struct i2c_client *client)
{
dprintk(1, "%s i2c attach [addr=0x%x,client=%s]\n",
client->driver->driver.name, client->addr, client->name);
if (!client->driver->command)
return 0;
return 0;
}
static int detach_inform(struct i2c_client *client)
{
dprintk(1, "i2c detach [client=%s]\n", client->name);
return 0;
}
void au0828_call_i2c_clients(struct au0828_dev *dev,
unsigned int cmd, void *arg)
{
if (dev->i2c_rc != 0)
return;
i2c_clients_command(&dev->i2c_adap, cmd, arg);
}
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,
.id = I2C_HW_B_AU0828,
.algo = &au0828_i2c_algo_template,
.class = I2C_CLASS_TV_ANALOG,
.client_register = attach_inform,
.client_unregister = detach_inform,
};
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_algo.data = dev;
dev->i2c_adap.algo_data = dev;
i2c_set_adapdata(&dev->i2c_adap, 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;
}
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