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

/*
 * Copyright 2009-2012 Freescale Semiconductor, Inc. All Rights Reserved.
 *
 * Author: Wu Guoxing <[email protected]>
 *
 * 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, &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 = 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)
{
	int ret = 0;
	struct mc9s08dz60 *mc9s;

	mc9s = kzalloc(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 = 1;
	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);

	ret = gpiochip_add(&mc9s->chip);
	if (ret)
		goto error;

	return 0;

 error:
	kfree(mc9s);
	return ret;
}

static int mc9s08dz60_remove(struct i2c_client *client)
{
	struct mc9s08dz60 *mc9s;
	int ret;

	mc9s = i2c_get_clientdata(client);

	ret = gpiochip_remove(&mc9s->chip);
	if (!ret)
		kfree(mc9s);

	return ret;

}

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 <[email protected]>");
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 <[email protected]>
	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
	32	static inline struct mc9s08dz60 to_mc9s08dz60(struct gpio_chip gc)
	33	{
	34	return container_of(gc, struct mc9s08dz60, chip);
	35	}
	36
	37
	38	static void mc9s_gpio_to_reg_and_bit(int offset, u8 reg, u8 bit)
	39	{
	40	*reg = 0x20 + offset / GPIO_NUM_PER_GROUP;
	41	*bit = offset % GPIO_NUM_PER_GROUP;
	42	}
	43
	44	static int mc9s08dz60_get_value(struct gpio_chip *gc, unsigned offset)
	45	{
	46	u8 reg, bit;
	47	s32 value;
	48	struct mc9s08dz60 *mc9s = to_mc9s08dz60(gc);
	49
	50	mc9s_gpio_to_reg_and_bit(offset, &reg, &bit);
	51	value = i2c_smbus_read_byte_data(mc9s->client, reg);
	52
	53	return (value >= 0) ? (value >> bit) & 0x1 : 0;
	54	}
	55
	56	static int mc9s08dz60_set(struct mc9s08dz60 *mc9s, unsigned offset, int val)
	57	{
	58	u8 reg, bit;
	59	s32 value;
	60
	61	mc9s_gpio_to_reg_and_bit(offset, &reg, &bit);
	62	value = i2c_smbus_read_byte_data(mc9s->client, reg);
	63	if (value >= 0) {
	64	if (val)
65	value \|= 1 << bit;
66	else
67	value &= ~(1 << bit);
68
69	return i2c_smbus_write_byte_data(mc9s->client, reg, value);
70	} else
71	return value;
72
73	}
74
75
76	static void mc9s08dz60_set_value(struct gpio_chip *gc, unsigned offset, int val)
77	{
78	struct mc9s08dz60 *mc9s = to_mc9s08dz60(gc);
79
80	mc9s08dz60_set(mc9s, offset, val);
81	}
82
83	static int mc9s08dz60_direction_output(struct gpio_chip *gc,
84	unsigned offset, int val)
85	{
86	struct mc9s08dz60 *mc9s = to_mc9s08dz60(gc);
87
88	return mc9s08dz60_set(mc9s, offset, val);
89	}
90
91	static int mc9s08dz60_probe(struct i2c_client *client,
92	const struct i2c_device_id *id)
93	{
94	int ret = 0;
95	struct mc9s08dz60 *mc9s;
96
97	mc9s = kzalloc(sizeof(*mc9s), GFP_KERNEL);
98	if (!mc9s)
99	return -ENOMEM;
100
101	mc9s->chip.label = client->name;
102	mc9s->chip.base = -1;
103	mc9s->chip.dev = &client->dev;
104	mc9s->chip.owner = THIS_MODULE;
105	mc9s->chip.ngpio = GPIO_NUM;
106	mc9s->chip.can_sleep = 1;
107	mc9s->chip.get = mc9s08dz60_get_value;
108	mc9s->chip.set = mc9s08dz60_set_value;
109	mc9s->chip.direction_output = mc9s08dz60_direction_output;
110	mc9s->client = client;
111	i2c_set_clientdata(client, mc9s);
112
113	ret = gpiochip_add(&mc9s->chip);
114	if (ret)
115	goto error;
116
117	return 0;
118
119	error:
120	kfree(mc9s);
121	return ret;
122	}
123
124	static int mc9s08dz60_remove(struct i2c_client *client)
125	{
126	struct mc9s08dz60 *mc9s;
127	int ret;
128
129	mc9s = i2c_get_clientdata(client);
130
131	ret = gpiochip_remove(&mc9s->chip);
132	if (!ret)
133	kfree(mc9s);
134
135	return ret;
136
137	}
138
139	static const struct i2c_device_id mc9s08dz60_id[] = {
140	{"mc9s08dz60", 0},
141	{},
142	};
143
144	MODULE_DEVICE_TABLE(i2c, mc9s08dz60_id);
145
146	static struct i2c_driver mc9s08dz60_i2c_driver = {
147	.driver = {
148	.owner = THIS_MODULE,
149	.name = "mc9s08dz60",
150	},
151	.probe = mc9s08dz60_probe,
152	.remove = mc9s08dz60_remove,
153	.id_table = mc9s08dz60_id,
154	};
155
156	module_i2c_driver(mc9s08dz60_i2c_driver);
157
158	MODULE_AUTHOR("Freescale Semiconductor, Inc. "
159	"Wu Guoxing <[email protected]>");
160	MODULE_DESCRIPTION("mc9s08dz60 gpio function on mx35 3ds board");
161	MODULE_LICENSE("GPL v2");