b9c1c297669e64a167a9257021a82d54e1f854c5
[linux-2.6.git] / drivers / gpio / gpio-tps65910.c
1 /*
2  * TI TPS6591x GPIO driver
3  *
4  * Copyright 2010 Texas Instruments Inc.
5  *
6  * Author: Graeme Gregory <gg@slimlogic.co.uk>
7  * Author: Jorge Eduardo Candelaria jedu@slimlogic.co.uk>
8  *
9  *  This program is free software; you can redistribute it and/or modify it
10  *  under  the terms of the GNU General  Public License as published by the
11  *  Free Software Foundation;  either version 2 of the License, or (at your
12  *  option) any later version.
13  *
14  */
15
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/errno.h>
19 #include <linux/gpio.h>
20 #include <linux/i2c.h>
21 #include <linux/mfd/tps65910.h>
22
23 static int tps65910_gpio_get(struct gpio_chip *gc, unsigned offset)
24 {
25         struct tps65910 *tps65910 = container_of(gc, struct tps65910, gpio);
26         uint8_t val;
27
28         tps65910->read(tps65910, TPS65910_GPIO0 + offset, 1, &val);
29
30         if (val & GPIO_STS_MASK)
31                 return 1;
32
33         return 0;
34 }
35
36 static void tps65910_gpio_set(struct gpio_chip *gc, unsigned offset,
37                               int value)
38 {
39         struct tps65910 *tps65910 = container_of(gc, struct tps65910, gpio);
40
41         if (value)
42                 tps65910_set_bits(tps65910, TPS65910_GPIO0 + offset,
43                                                 GPIO_SET_MASK);
44         else
45                 tps65910_clear_bits(tps65910, TPS65910_GPIO0 + offset,
46                                                 GPIO_SET_MASK);
47 }
48
49 static int tps65910_gpio_output(struct gpio_chip *gc, unsigned offset,
50                                 int value)
51 {
52         struct tps65910 *tps65910 = container_of(gc, struct tps65910, gpio);
53
54         /* Set the initial value */
55         tps65910_gpio_set(gc, 0, value);
56
57         return tps65910_set_bits(tps65910, TPS65910_GPIO0 + offset,
58                                                 GPIO_CFG_MASK);
59 }
60
61 static int tps65910_gpio_input(struct gpio_chip *gc, unsigned offset)
62 {
63         struct tps65910 *tps65910 = container_of(gc, struct tps65910, gpio);
64
65         return tps65910_clear_bits(tps65910, TPS65910_GPIO0 + offset,
66                                                 GPIO_CFG_MASK);
67 }
68
69 void tps65910_gpio_init(struct tps65910 *tps65910, int gpio_base)
70 {
71         int ret;
72
73         if (!gpio_base)
74                 return;
75
76         tps65910->gpio.owner            = THIS_MODULE;
77         tps65910->gpio.label            = tps65910->i2c_client->name;
78         tps65910->gpio.dev              = tps65910->dev;
79         tps65910->gpio.base             = gpio_base;
80
81         switch(tps65910_chip_id(tps65910)) {
82         case TPS65910:
83                 tps65910->gpio.ngpio    = 6;
84                 break;
85         case TPS65911:
86                 tps65910->gpio.ngpio    = 9;
87                 break;
88         default:
89                 return;
90         }
91         tps65910->gpio.can_sleep        = 1;
92
93         tps65910->gpio.direction_input  = tps65910_gpio_input;
94         tps65910->gpio.direction_output = tps65910_gpio_output;
95         tps65910->gpio.set              = tps65910_gpio_set;
96         tps65910->gpio.get              = tps65910_gpio_get;
97
98         ret = gpiochip_add(&tps65910->gpio);
99
100         if (ret)
101                 dev_warn(tps65910->dev, "GPIO registration failed: %d\n", ret);
102 }