summaryrefslogtreecommitdiff
path: root/drivers/gpio/gpio-mc9s08dz60.c
blob: dce35ff00db72ff6224dfc519a5928b9bd21a337 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
/*
 * 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, &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)
{
	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);

	return gpiochip_remove(&mc9s->chip);
}

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");