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Graeme Gregory2537df72011-05-02 16:19:52 -05001/*
2 * tps65910-gpio.c -- TI TPS6591x
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
23static 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
Jorge Eduardo Candelaria11ad14f2011-05-16 18:35:42 -050028 tps65910->read(tps65910, TPS65910_GPIO0 + offset, 1, &val);
Graeme Gregory2537df72011-05-02 16:19:52 -050029
Jorge Eduardo Candelaria11ad14f2011-05-16 18:35:42 -050030 if (val & GPIO_STS_MASK)
Graeme Gregory2537df72011-05-02 16:19:52 -050031 return 1;
32
33 return 0;
34}
35
36static 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)
Jorge Eduardo Candelaria11ad14f2011-05-16 18:35:42 -050042 tps65910_set_bits(tps65910, TPS65910_GPIO0 + offset,
43 GPIO_SET_MASK);
Graeme Gregory2537df72011-05-02 16:19:52 -050044 else
Jorge Eduardo Candelaria11ad14f2011-05-16 18:35:42 -050045 tps65910_clear_bits(tps65910, TPS65910_GPIO0 + offset,
46 GPIO_SET_MASK);
Graeme Gregory2537df72011-05-02 16:19:52 -050047}
48
49static 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
Jorge Eduardo Candelaria11ad14f2011-05-16 18:35:42 -050057 return tps65910_set_bits(tps65910, TPS65910_GPIO0 + offset,
58 GPIO_CFG_MASK);
Graeme Gregory2537df72011-05-02 16:19:52 -050059}
60
61static int tps65910_gpio_input(struct gpio_chip *gc, unsigned offset)
62{
63 struct tps65910 *tps65910 = container_of(gc, struct tps65910, gpio);
64
Jorge Eduardo Candelaria11ad14f2011-05-16 18:35:42 -050065 return tps65910_clear_bits(tps65910, TPS65910_GPIO0 + offset,
66 GPIO_CFG_MASK);
Graeme Gregory2537df72011-05-02 16:19:52 -050067}
68
69void 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;
Jorge Eduardo Candelaria11ad14f2011-05-16 18:35:42 -050080
81 switch(tps65910_chip_id(tps65910)) {
82 case TPS65910:
83 tps65910->gpio.ngpio = 6;
84 case TPS65911:
85 tps65910->gpio.ngpio = 9;
86 default:
87 return;
88 }
Graeme Gregory2537df72011-05-02 16:19:52 -050089 tps65910->gpio.can_sleep = 1;
90
91 tps65910->gpio.direction_input = tps65910_gpio_input;
92 tps65910->gpio.direction_output = tps65910_gpio_output;
93 tps65910->gpio.set = tps65910_gpio_set;
94 tps65910->gpio.get = tps65910_gpio_get;
95
96 ret = gpiochip_add(&tps65910->gpio);
97
98 if (ret)
99 dev_warn(tps65910->dev, "GPIO registration failed: %d\n", ret);
100}