path: root/drivers/mfd/stmpe.c

/*
 * Copyright (C) ST-Ericsson SA 2010
 *
 * License Terms: GNU General Public License, version 2
 * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/mfd/core.h>
#include <linux/mfd/stmpe.h>
#include "stmpe.h"

static int __stmpe_enable(struct stmpe *stmpe, unsigned int blocks)
{
	return stmpe->variant->enable(stmpe, blocks, true);
}

static int __stmpe_disable(struct stmpe *stmpe, unsigned int blocks)
{
	return stmpe->variant->enable(stmpe, blocks, false);
}

static int __stmpe_reg_read(struct stmpe *stmpe, u8 reg)
{
	int ret;

	ret = i2c_smbus_read_byte_data(stmpe->i2c, reg);
	if (ret < 0)
		dev_err(stmpe->dev, "failed to read reg %#x: %d\n",
			reg, ret);

	dev_vdbg(stmpe->dev, "rd: reg %#x => data %#x\n", reg, ret);

	return ret;
}

static int __stmpe_reg_write(struct stmpe *stmpe, u8 reg, u8 val)
{
	int ret;

	dev_vdbg(stmpe->dev, "wr: reg %#x <= %#x\n", reg, val);

	ret = i2c_smbus_write_byte_data(stmpe->i2c, reg, val);
	if (ret < 0)
		dev_err(stmpe->dev, "failed to write reg %#x: %d\n",
			reg, ret);

	return ret;
}

static int __stmpe_set_bits(struct stmpe *stmpe, u8 reg, u8 mask, u8 val)
{
	int ret;

	ret = __stmpe_reg_read(stmpe, reg);
	if (ret < 0)
		return ret;

	ret &= ~mask;
	ret |= val;

	return __stmpe_reg_write(stmpe, reg, ret);
}

static int __stmpe_block_read(struct stmpe *stmpe, u8 reg, u8 length,
			      u8 *values)
{
	int ret;

	ret = i2c_smbus_read_i2c_block_data(stmpe->i2c, reg, length, values);
	if (ret < 0)
		dev_err(stmpe->dev, "failed to read regs %#x: %d\n",
			reg, ret);

	dev_vdbg(stmpe->dev, "rd: reg %#x (%d) => ret %#x\n", reg, length, ret);
	stmpe_dump_bytes("stmpe rd: ", values, length);

	return ret;
}

static int __stmpe_block_write(struct stmpe *stmpe, u8 reg, u8 length,
			const u8 *values)
{
	int ret;

	dev_vdbg(stmpe->dev, "wr: regs %#x (%d)\n", reg, length);
	stmpe_dump_bytes("stmpe wr: ", values, length);

	ret = i2c_smbus_write_i2c_block_data(stmpe->i2c, reg, length,
					     values);
	if (ret < 0)
		dev_err(stmpe->dev, "failed to write regs %#x: %d\n",
			reg, ret);

	return ret;
}

/**
 * stmpe_enable - enable blocks on an STMPE device
 * @stmpe:	Device to work on
 * @blocks:	Mask of blocks (enum stmpe_block values) to enable
 */
int stmpe_enable(struct stmpe *stmpe, unsigned int blocks)
{
	int ret;

	mutex_lock(&stmpe->lock);
	ret = __stmpe_enable(stmpe, blocks);
	mutex_unlock(&stmpe->lock);

	return ret;
}
EXPORT_SYMBOL_GPL(stmpe_enable);

/**
 * stmpe_disable - disable blocks on an STMPE device
 * @stmpe:	Device to work on
 * @blocks:	Mask of blocks (enum stmpe_block values) to enable
 */
int stmpe_disable(struct stmpe *stmpe, unsigned int blocks)
{
	int ret;

	mutex_lock(&stmpe->lock);
	ret = __stmpe_disable(stmpe, blocks);
	mutex_unlock(&stmpe->lock);

	return ret;
}
EXPORT_SYMBOL_GPL(stmpe_disable);

/**
 * stmpe_reg_read() - read a single STMPE register
 * @stmpe:	Device to read from
 * @reg:	Register to read
 */
int stmpe_reg_read(struct stmpe *stmpe, u8 reg)
{
	int ret;

	mutex_lock(&stmpe->lock);
	ret = __stmpe_reg_read(stmpe, reg);
	mutex_unlock(&stmpe->lock);

	return ret