Root/drivers/gpio/gpio-mc9s08dz60.c

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
27struct mc9s08dz60 {
28    struct i2c_client *client;
29    struct gpio_chip chip;
30};
31
32static inline struct mc9s08dz60 *to_mc9s08dz60(struct gpio_chip *gc)
33{
34    return container_of(gc, struct mc9s08dz60, chip);
35}
36
37
38static 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
44static 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
56static 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
76static 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
83static 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
91static 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
124static 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
139static const struct i2c_device_id mc9s08dz60_id[] = {
140    {"mc9s08dz60", 0},
141    {},
142};
143
144MODULE_DEVICE_TABLE(i2c, mc9s08dz60_id);
145
146static 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
156module_i2c_driver(mc9s08dz60_i2c_driver);
157
158MODULE_AUTHOR("Freescale Semiconductor, Inc. "
159        "Wu Guoxing <b39297@freescale.com>");
160MODULE_DESCRIPTION("mc9s08dz60 gpio function on mx35 3ds board");
161MODULE_LICENSE("GPL v2");
162

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