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/*
* Hauppauge HD PVR USB driver
*
* Copyright (C) 2008 Janne Grunau (j@jannau.net)
*
* 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, version 2.
*
*/
#include <linux/i2c.h>
#include <linux/slab.h>
#include "hdpvr.h"
#define CTRL_READ_REQUEST 0xb8
#define CTRL_WRITE_REQUEST 0x38
#define REQTYPE_I2C_READ 0xb1
#define REQTYPE_I2C_WRITE 0xb0
#define REQTYPE_I2C_WRITE_STATT 0xd0
static int hdpvr_i2c_read(struct hdpvr_device *dev, unsigned char addr,
char *data, int len)
{
int ret;
char *buf = kmalloc(len, GFP_KERNEL);
if (!buf)
return -ENOMEM;
ret = usb_control_msg(dev->udev,
usb_rcvctrlpipe(dev->udev, 0),
REQTYPE_I2C_READ, CTRL_READ_REQUEST,
0x100|addr, 0, buf, len, 1000);
if (ret == len) {
memcpy(data, buf, len);
ret = 0;
} else if (ret >= 0)
ret = -EIO;
kfree(buf);
return ret;
}
static int hdpvr_i2c_write(struct hdpvr_device *dev, unsigned char addr,
char *data, int len)
{
int ret;
char *buf = kmalloc(len, GFP_KERNEL);
if (!buf)
return -ENOMEM;
memcpy(buf, data, len);
ret = usb_control_msg(dev->udev,
usb_sndctrlpipe(dev->udev, 0),
REQTYPE_I2C_WRITE, CTRL_WRITE_REQUEST,
0x100|addr, 0, buf, len, 1000);
if (ret < 0)
goto error;
ret = usb_control_msg(dev->udev,
usb_rcvctrlpipe(dev->udev, 0),
REQTYPE_I2C_WRITE_STATT, CTRL_READ_REQUEST,
0, 0, buf, 2, 1000);
if (ret == 2)
ret = 0;
else if (ret >= 0)
ret = -EIO;
error:
kfree(buf);
return ret;
}
static int hdpvr_transfer(struct i2c_adapter *i2c_adapter, struct i2c_msg *msgs,
int num)
{
struct hdpvr_device *dev = i2c_get_adapdata(i2c_adapter);
int retval = 0, i, addr;
if (num <= 0)
return 0;
mutex_lock(&dev->i2c_mutex);
for (i = 0; i < num && !retval; i++) {
addr = msgs[i].addr << 1;
if (msgs[i].flags & I2C_M_RD)
retval = hdpvr_i2c_read(dev, addr, msgs[i].buf,
msgs[i].len);
else
retval = hdpvr_i2c_write(dev, addr, msgs[i].buf,
msgs[i].len);
}
mutex_unlock(&dev->i2c_mutex);
return retval ? retval : num;
}
static u32 hdpvr_functionality(struct i2c_adapter *adapter)
{
return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
}
static struct i2c_algorithm hdpvr_algo = {
.master_xfer = hdpvr_transfer,
.functionality = hdpvr_functionality,
};
int hdpvr_register_i2c_adapter(struct hdpvr_device *dev)
{
struct i2c_adapter *i2c_adap;
int retval = -ENOMEM;
i2c_adap = kzalloc(sizeof(struct i2c_adapter), GFP_KERNEL);
if (i2c_adap == NULL)
goto error;
strlcpy(i2c_adap->name, "Hauppauge HD PVR I2C",
sizeof(i2c_adap->name));
i2c_adap->algo = &hdpvr_algo;
i2c_adap->owner = THIS_MODULE;
i2c_adap->dev.parent = &dev->udev->dev;
i2c_set_adapdata(i2c_adap, dev);
retval = i2c_add_adapter(i2c_adap);
if (!retval)
dev->i2c_adapter = i2c_adap;
else
kfree(i2c_adap);
error:
return retval;
}
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