e81516c58e
There is no point in defining I2C adapter IDs when no code is using them. As this field might go away in the future, stop using it when we don't need to. Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
144 lines
2.9 KiB
C
144 lines
2.9 KiB
C
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/*
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* Hauppauge HD PVR USB driver
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*
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* Copyright (C) 2008 Janne Grunau (j@jannau.net)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2.
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*
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*/
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#include <linux/i2c.h>
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#include "hdpvr.h"
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#define CTRL_READ_REQUEST 0xb8
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#define CTRL_WRITE_REQUEST 0x38
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#define REQTYPE_I2C_READ 0xb1
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#define REQTYPE_I2C_WRITE 0xb0
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#define REQTYPE_I2C_WRITE_STATT 0xd0
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static int hdpvr_i2c_read(struct hdpvr_device *dev, unsigned char addr,
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char *data, int len)
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{
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int ret;
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char *buf = kmalloc(len, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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ret = usb_control_msg(dev->udev,
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usb_rcvctrlpipe(dev->udev, 0),
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REQTYPE_I2C_READ, CTRL_READ_REQUEST,
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0x100|addr, 0, buf, len, 1000);
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if (ret == len) {
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memcpy(data, buf, len);
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ret = 0;
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} else if (ret >= 0)
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ret = -EIO;
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kfree(buf);
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return ret;
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}
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static int hdpvr_i2c_write(struct hdpvr_device *dev, unsigned char addr,
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char *data, int len)
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{
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int ret;
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char *buf = kmalloc(len, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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memcpy(buf, data, len);
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ret = usb_control_msg(dev->udev,
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usb_sndctrlpipe(dev->udev, 0),
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REQTYPE_I2C_WRITE, CTRL_WRITE_REQUEST,
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0x100|addr, 0, buf, len, 1000);
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if (ret < 0)
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goto error;
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ret = usb_control_msg(dev->udev,
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usb_rcvctrlpipe(dev->udev, 0),
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REQTYPE_I2C_WRITE_STATT, CTRL_READ_REQUEST,
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0, 0, buf, 2, 1000);
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if (ret == 2)
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ret = 0;
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else if (ret >= 0)
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ret = -EIO;
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error:
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kfree(buf);
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return ret;
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}
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static int hdpvr_transfer(struct i2c_adapter *i2c_adapter, struct i2c_msg *msgs,
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int num)
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{
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struct hdpvr_device *dev = i2c_get_adapdata(i2c_adapter);
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int retval = 0, i, addr;
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if (num <= 0)
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return 0;
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mutex_lock(&dev->i2c_mutex);
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for (i = 0; i < num && !retval; i++) {
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addr = msgs[i].addr << 1;
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if (msgs[i].flags & I2C_M_RD)
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retval = hdpvr_i2c_read(dev, addr, msgs[i].buf,
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msgs[i].len);
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else
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retval = hdpvr_i2c_write(dev, addr, msgs[i].buf,
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msgs[i].len);
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}
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mutex_unlock(&dev->i2c_mutex);
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return retval ? retval : num;
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}
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static u32 hdpvr_functionality(struct i2c_adapter *adapter)
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{
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return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
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}
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static struct i2c_algorithm hdpvr_algo = {
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.master_xfer = hdpvr_transfer,
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.functionality = hdpvr_functionality,
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};
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int hdpvr_register_i2c_adapter(struct hdpvr_device *dev)
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{
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struct i2c_adapter *i2c_adap;
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int retval = -ENOMEM;
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i2c_adap = kzalloc(sizeof(struct i2c_adapter), GFP_KERNEL);
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if (i2c_adap == NULL)
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goto error;
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strlcpy(i2c_adap->name, "Hauppauge HD PVR I2C",
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sizeof(i2c_adap->name));
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i2c_adap->algo = &hdpvr_algo;
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i2c_adap->class = I2C_CLASS_TV_ANALOG;
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i2c_adap->owner = THIS_MODULE;
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i2c_adap->dev.parent = &dev->udev->dev;
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i2c_set_adapdata(i2c_adap, dev);
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retval = i2c_add_adapter(i2c_adap);
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if (!retval)
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dev->i2c_adapter = i2c_adap;
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else
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kfree(i2c_adap);
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error:
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return retval;
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}
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