[deliverable/linux.git] / drivers / gpio / gpio-mc9s08dz60.c

/*
 * 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 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 = gpiochip_get_data(gc);

	mc9s_gpio_to_reg_and_bit(offset, &reg, &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, &reg, &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 = gpiochip_get_data(gc);

	mc9s08dz60_set(mc9s, offset, val);
}

static int mc9s08dz60_direction_output(struct gpio_chip *gc,
				       unsigned offset, int val)
{
	struct mc9s08dz60 *mc9s = gpiochip_get_data(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.parent = &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_data(&mc9s->chip, mc9s);
}

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 = {
		.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");
Commit	Line	Data
608589b1	1	/*
	2	* Copyright 2009-2012 Freescale Semiconductor, Inc. All Rights Reserved.
	3	*
	4	* Author: Wu Guoxing <b39297@freescale.com>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*/
	16
	17	#include <linux/kernel.h>
	18	#include <linux/module.h>
	19	#include <linux/slab.h>
	20	#include <linux/i2c.h>
	21	#include <linux/gpio.h>
	22
	23	#define GPIO_GROUP_NUM 2
	24	#define GPIO_NUM_PER_GROUP 8
	25	#define GPIO_NUM (GPIO_GROUP_NUM*GPIO_NUM_PER_GROUP)
	26
	27	struct mc9s08dz60 {
	28	struct i2c_client *client;
	29	struct gpio_chip chip;
	30	};
	31
608589b1	32	static void mc9s_gpio_to_reg_and_bit(int offset, u8 reg, u8 bit)
	33	{
	34	*reg = 0x20 + offset / GPIO_NUM_PER_GROUP;
	35	*bit = offset % GPIO_NUM_PER_GROUP;
	36	}
	37
	38	static int mc9s08dz60_get_value(struct gpio_chip *gc, unsigned offset)
	39	{
	40	u8 reg, bit;
	41	s32 value;
cf90c9e3	42	struct mc9s08dz60 *mc9s = gpiochip_get_data(gc);
608589b1	43
	44	mc9s_gpio_to_reg_and_bit(offset, &reg, &bit);
	45	value = i2c_smbus_read_byte_data(mc9s->client, reg);
	46
	47	return (value >= 0) ? (value >> bit) & 0x1 : 0;
	48	}
	49
	50	static int mc9s08dz60_set(struct mc9s08dz60 *mc9s, unsigned offset, int val)
	51	{
	52	u8 reg, bit;
	53	s32 value;
	54
	55	mc9s_gpio_to_reg_and_bit(offset, &reg, &bit);
	56	value = i2c_smbus_read_byte_data(mc9s->client, reg);
	57	if (value >= 0) {
	58	if (val)
	59	value \|= 1 << bit;
	60	else
	61	value &= ~(1 << bit);
	62
	63	return i2c_smbus_write_byte_data(mc9s->client, reg, value);
	64	} else
	65	return value;
	66
	67	}
	68
	69
	70	static void mc9s08dz60_set_value(struct gpio_chip *gc, unsigned offset, int val)
	71	{
cf90c9e3	72	struct mc9s08dz60 *mc9s = gpiochip_get_data(gc);
608589b1	73
	74	mc9s08dz60_set(mc9s, offset, val);
	75	}
	76
	77	static int mc9s08dz60_direction_output(struct gpio_chip *gc,
	78	unsigned offset, int val)
	79	{
cf90c9e3	80	struct mc9s08dz60 *mc9s = gpiochip_get_data(gc);
608589b1	81
	82	return mc9s08dz60_set(mc9s, offset, val);
	83	}
	84
	85	static int mc9s08dz60_probe(struct i2c_client *client,
	86	const struct i2c_device_id *id)
	87	{
608589b1	88	struct mc9s08dz60 *mc9s;
608589b1	89
3c7051d7	90	mc9s = devm_kzalloc(&client->dev, sizeof(*mc9s), GFP_KERNEL);
608589b1	91	if (!mc9s)
	92	return -ENOMEM;
	93
	94	mc9s->chip.label = client->name;
	95	mc9s->chip.base = -1;
58383c78	96	mc9s->chip.parent = &client->dev;
608589b1	97	mc9s->chip.owner = THIS_MODULE;
608589b1	98	mc9s->chip.ngpio = GPIO_NUM;
9fb1f39e	99	mc9s->chip.can_sleep = true;
608589b1	100	mc9s->chip.get = mc9s08dz60_get_value;
	101	mc9s->chip.set = mc9s08dz60_set_value;
	102	mc9s->chip.direction_output = mc9s08dz60_direction_output;
	103	mc9s->client = client;
	104	i2c_set_clientdata(client, mc9s);
	105
cf90c9e3	106	return gpiochip_add_data(&mc9s->chip, mc9s);
608589b1	107	}
	108
	109	static int mc9s08dz60_remove(struct i2c_client *client)
	110	{
	111	struct mc9s08dz60 *mc9s;
608589b1	112
	113	mc9s = i2c_get_clientdata(client);
	114
9f5132ae	115	gpiochip_remove(&mc9s->chip);
9f5132ae	116	return 0;
608589b1	117	}
	118
	119	static const struct i2c_device_id mc9s08dz60_id[] = {
	120	{"mc9s08dz60", 0},
	121	{},
	122	};
	123
	124	MODULE_DEVICE_TABLE(i2c, mc9s08dz60_id);
	125
	126	static struct i2c_driver mc9s08dz60_i2c_driver = {
	127	.driver = {
608589b1	128	.name = "mc9s08dz60",
	129	},
	130	.probe = mc9s08dz60_probe,
	131	.remove = mc9s08dz60_remove,
	132	.id_table = mc9s08dz60_id,
	133	};
	134
	135	module_i2c_driver(mc9s08dz60_i2c_driver);
	136
	137	MODULE_AUTHOR("Freescale Semiconductor, Inc. "
	138	"Wu Guoxing <b39297@freescale.com>");
	139	MODULE_DESCRIPTION("mc9s08dz60 gpio function on mx35 3ds board");
	140	MODULE_LICENSE("GPL v2");