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
tps65910_gpio_get(struct gpio_chip * gc,unsigned offset)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
tps65910_gpio_set(struct gpio_chip * gc,unsigned offset,int value)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
tps65910_gpio_output(struct gpio_chip * gc,unsigned offset,int value)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, offset, value);
56
57 return tps65910_set_bits(tps65910, TPS65910_GPIO0 + offset,
58 GPIO_CFG_MASK);
59 }
60
tps65910_gpio_input(struct gpio_chip * gc,unsigned offset)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
tps65910_gpio_init(struct tps65910 * tps65910,int gpio_base)69 void tps65910_gpio_init(struct tps65910 *tps65910, int gpio_base)
70 {
71 int ret;
72 struct tps65910_board *board_data;
73
74 if (!gpio_base)
75 return;
76
77 tps65910->gpio.owner = THIS_MODULE;
78 tps65910->gpio.label = tps65910->i2c_client->name;
79 tps65910->gpio.dev = tps65910->dev;
80 tps65910->gpio.base = gpio_base;
81
82 switch(tps65910_chip_id(tps65910)) {
83 case TPS65910:
84 tps65910->gpio.ngpio = TPS65910_NUM_GPIO;
85 break;
86 case TPS65911:
87 tps65910->gpio.ngpio = TPS65911_NUM_GPIO;
88 break;
89 default:
90 return;
91 }
92 tps65910->gpio.can_sleep = 1;
93
94 tps65910->gpio.direction_input = tps65910_gpio_input;
95 tps65910->gpio.direction_output = tps65910_gpio_output;
96 tps65910->gpio.set = tps65910_gpio_set;
97 tps65910->gpio.get = tps65910_gpio_get;
98
99 /* Configure sleep control for gpios */
100 board_data = dev_get_platdata(tps65910->dev);
101 if (board_data) {
102 int i;
103 for (i = 0; i < tps65910->gpio.ngpio; ++i) {
104 if (board_data->en_gpio_sleep[i]) {
105 ret = tps65910_set_bits(tps65910,
106 TPS65910_GPIO0 + i, GPIO_SLEEP_MASK);
107 if (ret < 0)
108 dev_warn(tps65910->dev,
109 "GPIO Sleep setting failed\n");
110 }
111 }
112 }
113
114 ret = gpiochip_add(&tps65910->gpio);
115
116 if (ret)
117 dev_warn(tps65910->dev, "GPIO registration failed: %d\n", ret);
118 }
119