gpio-mc9s08dz60.c
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/*
* Copyright 2009-2012 Freescale Semiconductor, Inc. All Rights Reserved.
*
* Author: Wu Guoxing <b39297@freescale.com>
*
* 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.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/gpio.h>
#define GPIO_GROUP_NUM 2
#define GPIO_NUM_PER_GROUP 8
#define GPIO_NUM (GPIO_GROUP_NUM*GPIO_NUM_PER_GROUP)
struct mc9s08dz60 {
struct i2c_client *client;
struct gpio_chip chip;
};
static inline struct mc9s08dz60 *to_mc9s08dz60(struct gpio_chip *gc)
{
return container_of(gc, struct mc9s08dz60, chip);
}
static void mc9s_gpio_to_reg_and_bit(int offset, u8 *reg, u8 *bit)
{
*reg = 0x20 + offset / GPIO_NUM_PER_GROUP;
*bit = offset % GPIO_NUM_PER_GROUP;
}
static int mc9s08dz60_get_value(struct gpio_chip *gc, unsigned offset)
{
u8 reg, bit;
s32 value;
struct mc9s08dz60 *mc9s = to_mc9s08dz60(gc);
mc9s_gpio_to_reg_and_bit(offset, ®, &bit);
value = i2c_smbus_read_byte_data(mc9s->client, reg);
return (value >= 0) ? (value >> bit) & 0x1 : 0;
}
static int mc9s08dz60_set(struct mc9s08dz60 *mc9s, unsigned offset, int val)
{
u8 reg, bit;
s32 value;
mc9s_gpio_to_reg_and_bit(offset, ®, &bit);
value = i2c_smbus_read_byte_data(mc9s->client, reg);
if (value >= 0) {
if (val)
value |= 1 << bit;
else
value &= ~(1 << bit);
return i2c_smbus_write_byte_data(mc9s->client, reg, value);
} else
return value;
}
static void mc9s08dz60_set_value(struct gpio_chip *gc, unsigned offset, int val)
{
struct mc9s08dz60 *mc9s = to_mc9s08dz60(gc);
mc9s08dz60_set(mc9s, offset, val);
}
static int mc9s08dz60_direction_output(struct gpio_chip *gc,
unsigned offset, int val)
{
struct mc9s08dz60 *mc9s = to_mc9s08dz60(gc);
return mc9s08dz60_set(mc9s, offset, val);
}
static int mc9s08dz60_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct mc9s08dz60 *mc9s;
mc9s = devm_kzalloc(&client->dev, sizeof(*mc9s), GFP_KERNEL);
if (!mc9s)
return -ENOMEM;
mc9s->chip.label = client->name;
mc9s->chip.base = -1;
mc9s->chip.dev = &client->dev;
mc9s->chip.owner = THIS_MODULE;
mc9s->chip.ngpio = GPIO_NUM;
mc9s->chip.can_sleep = true;
mc9s->chip.get = mc9s08dz60_get_value;
mc9s->chip.set = mc9s08dz60_set_value;
mc9s->chip.direction_output = mc9s08dz60_direction_output;
mc9s->client = client;
i2c_set_clientdata(client, mc9s);
return gpiochip_add(&mc9s->chip);
}
static int mc9s08dz60_remove(struct i2c_client *client)
{
struct mc9s08dz60 *mc9s;
mc9s = i2c_get_clientdata(client);
gpiochip_remove(&mc9s->chip);
return 0;
}
static const struct i2c_device_id mc9s08dz60_id[] = {
{"mc9s08dz60", 0},
{},
};
MODULE_DEVICE_TABLE(i2c, mc9s08dz60_id);
static struct i2c_driver mc9s08dz60_i2c_driver = {
.driver = {
.owner = THIS_MODULE,
.name = "mc9s08dz60",
},
.probe = mc9s08dz60_probe,
.remove = mc9s08dz60_remove,
.id_table = mc9s08dz60_id,
};
module_i2c_driver(mc9s08dz60_i2c_driver);
MODULE_AUTHOR("Freescale Semiconductor, Inc. "
"Wu Guoxing <b39297@freescale.com>");
MODULE_DESCRIPTION("mc9s08dz60 gpio function on mx35 3ds board");
MODULE_LICENSE("GPL v2");