linux-vybrid_public/drivers/media/video/tuner-i2c.h

/*
    tuner-i2c.h - i2c interface for different tuners

    Copyright (C) 2007 Michael Krufky (mkrufky@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.
*/

#ifndef __TUNER_I2C_H__
#define __TUNER_I2C_H__

#include <linux/i2c.h>

struct tuner_i2c_props {
	u8 addr;
	struct i2c_adapter *adap;
};

static inline int tuner_i2c_xfer_send(struct tuner_i2c_props *props, char *buf, int len)
{
	struct i2c_msg msg = { .addr = props->addr, .flags = 0,
			       .buf = buf, .len = len };
	int ret = i2c_transfer(props->adap, &msg, 1);

	return (ret == 1) ? len : ret;
}

static inline int tuner_i2c_xfer_recv(struct tuner_i2c_props *props, char *buf, int len)
{
	struct i2c_msg msg = { .addr = props->addr, .flags = I2C_M_RD,
			       .buf = buf, .len = len };
	int ret = i2c_transfer(props->adap, &msg, 1);

	return (ret == 1) ? len : ret;
}

static inline int tuner_i2c_xfer_send_recv(struct tuner_i2c_props *props,
					   char *obuf, int olen,
					   char *ibuf, int ilen)
{
	struct i2c_msg msg[2] = { { .addr = props->addr, .flags = 0,
				    .buf = obuf, .len = olen },
				  { .addr = props->addr, .flags = I2C_M_RD,
				    .buf = ibuf, .len = ilen } };
	int ret = i2c_transfer(props->adap, msg, 2);

	return (ret == 2) ? ilen : ret;
}

#define tuner_warn(fmt, arg...) do {					\
	printk(KERN_WARNING "%s %d-%04x: " fmt, PREFIX,			\
			i2c_adapter_id(priv->i2c_props.adap),		\
			priv->i2c_props.addr, ##arg);			\
	 } while (0)

#define tuner_info(fmt, arg...) do {					\
	printk(KERN_INFO "%s %d-%04x: " fmt, PREFIX,			\
			i2c_adapter_id(priv->i2c_props.adap),		\
			priv->i2c_props.addr , ##arg);			\
	} while (0)

#define tuner_err(fmt, arg...) do {					\
	printk(KERN_ERR "%s %d-%04x: " fmt, PREFIX, 			\
			i2c_adapter_id(priv->i2c_props.adap),		\
			priv->i2c_props.addr , ##arg);			\
	} while (0)

#define tuner_dbg(fmt, arg...) do {					\
	if ((debug))							\
		printk(KERN_DEBUG "%s %d-%04x: " fmt, PREFIX,		\
			i2c_adapter_id(priv->i2c_props.adap),		\
			priv->i2c_props.addr , ##arg);			\
	} while (0)

#endif /* __TUNER_I2C_H__ */