dddvb/ddbridge/ddbridge-i2c.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * ddbridge-i2c.h: Digital Devices bridge i2c driver
 *
 * Copyright (C) 2010-2017 Digital Devices GmbH
 *                         Ralph Metzler <rjkm@metzlerbros.de>
 *                         Marcus Metzler <mocm@metzlerbros.de>
 *
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 only, as published by the Free Software Foundation.
 *
 *
 * 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, see <https://www.gnu.org/licenses/>.
 */

#ifndef _DDBRIDGE_I2C_H_
#define _DDBRIDGE_I2C_H_

#include <linux/i2c.h>
#include <linux/types.h>

static inline int i2c_io(struct i2c_adapter *adapter, u8 adr,
			 u8 *wbuf, u32 wlen, u8 *rbuf, u32 rlen)
{
	struct i2c_msg msgs[2] = {{.addr = adr,  .flags = 0,
				   .buf  = wbuf, .len   = wlen },
				  {.addr = adr,  .flags = I2C_M_RD,
				   .buf  = rbuf,  .len   = rlen } };
	return (i2c_transfer(adapter, msgs, 2) == 2) ? 0 : -1;
}

static inline int i2c_write(struct i2c_adapter *adap, u8 adr,
			    u8 *data, int len)
{
	struct i2c_msg msg = {.addr = adr, .flags = 0,
			      .buf = data, .len = len};

	return (i2c_transfer(adap, &msg, 1) == 1) ? 0 : -1;
}

static inline int i2c_read(struct i2c_adapter *adapter, u8 adr, u8 *val)
{
	struct i2c_msg msgs[1] = {{.addr = adr,  .flags = I2C_M_RD,
				   .buf  = val,  .len   = 1 } };
	return (i2c_transfer(adapter, msgs, 1) == 1) ? 0 : -1;
}

static inline int i2c_read_regs(struct i2c_adapter *adapter,
				u8 adr, u8 reg, u8 *val, u8 len)
{
	struct i2c_msg msgs[2] = {{.addr = adr,  .flags = 0,
				   .buf  = &reg, .len   = 1 },
				  {.addr = adr,  .flags = I2C_M_RD,
				   .buf  = val,  .len   = len } };
	return (i2c_transfer(adapter, msgs, 2) == 2) ? 0 : -1;
}

static inline int i2c_read_regs16(struct i2c_adapter *adapter,
				  u8 adr, u16 reg, u8 *val, u8 len)
{
	u8 reg16[2] = { reg >> 8, reg };
	struct i2c_msg msgs[2] = {{.addr = adr,  .flags = 0,
				   .buf  = reg16, .len   = 2 },
				  {.addr = adr,  .flags = I2C_M_RD,
				   .buf  = val,  .len   = len } };
	return (i2c_transfer(adapter, msgs, 2) == 2) ? 0 : -1;
}

static inline int i2c_read_reg(struct i2c_adapter *adapter, u8 adr,
			       u8 reg, u8 *val)
{
	struct i2c_msg msgs[2] = {{.addr = adr,  .flags = 0,
				   .buf  = &reg, .len   = 1},
				  {.addr = adr,  .flags = I2C_M_RD,
				   .buf  = val,  .len   = 1 } };
	return (i2c_transfer(adapter, msgs, 2) == 2) ? 0 : -1;
}

static inline int i2c_read_reg16(struct i2c_adapter *adapter, u8 adr,
				 u16 reg, u8 *val)
{
	u8 msg[2] = {reg >> 8, reg & 0xff};
	struct i2c_msg msgs[2] = {{.addr = adr, .flags = 0,
				   .buf  = msg, .len   = 2},
				  {.addr = adr, .flags = I2C_M_RD,
				   .buf  = val, .len   = 1 } };
	return (i2c_transfer(adapter, msgs, 2) == 2) ? 0 : -1;
}

static inline int i2c_write_reg16(struct i2c_adapter *adap, u8 adr,
				  u16 reg, u8 val)
{
	u8 msg[3] = {reg >> 8, reg & 0xff, val};

	return i2c_write(adap, adr, msg, 3);
}

static inline int i2c_write_reg(struct i2c_adapter *adap, u8 adr,
				u8 reg, u8 val)
{
	u8 msg[2] = {reg, val};

	return i2c_write(adap, adr, msg, 2);
}

#endif