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668a6cc7 MO |
1 | /* |
2 | * Copyright 2011 Texas Instruments Inc. | |
3 | * | |
4 | * Author: Margarita Olaya <magi@slimlogic.co.uk> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the | |
8 | * Free Software Foundation; either version 2 of the License, or (at your | |
9 | * option) any later version. | |
10 | * | |
11 | * This driver is based on wm8350 implementation. | |
12 | */ | |
13 | ||
14 | #include <linux/kernel.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/errno.h> | |
17 | #include <linux/gpio.h> | |
18 | #include <linux/mfd/core.h> | |
19 | #include <linux/platform_device.h> | |
20 | #include <linux/seq_file.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/mfd/tps65912.h> | |
23 | ||
24 | struct tps65912_gpio_data { | |
25 | struct tps65912 *tps65912; | |
26 | struct gpio_chip gpio_chip; | |
27 | }; | |
28 | ||
29 | static int tps65912_gpio_get(struct gpio_chip *gc, unsigned offset) | |
30 | { | |
31 | struct tps65912 *tps65912 = container_of(gc, struct tps65912, gpio); | |
32 | int val; | |
33 | ||
34 | val = tps65912_reg_read(tps65912, TPS65912_GPIO1 + offset); | |
35 | ||
36 | if (val & GPIO_STS_MASK) | |
37 | return 1; | |
38 | ||
39 | return 0; | |
40 | } | |
41 | ||
42 | static void tps65912_gpio_set(struct gpio_chip *gc, unsigned offset, | |
43 | int value) | |
44 | { | |
45 | struct tps65912 *tps65912 = container_of(gc, struct tps65912, gpio); | |
46 | ||
47 | if (value) | |
48 | tps65912_set_bits(tps65912, TPS65912_GPIO1 + offset, | |
49 | GPIO_SET_MASK); | |
50 | else | |
51 | tps65912_clear_bits(tps65912, TPS65912_GPIO1 + offset, | |
52 | GPIO_SET_MASK); | |
53 | } | |
54 | ||
55 | static int tps65912_gpio_output(struct gpio_chip *gc, unsigned offset, | |
56 | int value) | |
57 | { | |
58 | struct tps65912 *tps65912 = container_of(gc, struct tps65912, gpio); | |
59 | ||
60 | /* Set the initial value */ | |
61 | tps65912_gpio_set(gc, offset, value); | |
62 | ||
63 | return tps65912_set_bits(tps65912, TPS65912_GPIO1 + offset, | |
64 | GPIO_CFG_MASK); | |
65 | } | |
66 | ||
67 | static int tps65912_gpio_input(struct gpio_chip *gc, unsigned offset) | |
68 | { | |
69 | struct tps65912 *tps65912 = container_of(gc, struct tps65912, gpio); | |
70 | ||
71 | return tps65912_clear_bits(tps65912, TPS65912_GPIO1 + offset, | |
72 | GPIO_CFG_MASK); | |
668a6cc7 MO |
73 | } |
74 | ||
75 | static struct gpio_chip template_chip = { | |
76 | .label = "tps65912", | |
77 | .owner = THIS_MODULE, | |
78 | .direction_input = tps65912_gpio_input, | |
79 | .direction_output = tps65912_gpio_output, | |
80 | .get = tps65912_gpio_get, | |
81 | .set = tps65912_gpio_set, | |
9fb1f39e | 82 | .can_sleep = true, |
668a6cc7 MO |
83 | .ngpio = 5, |
84 | .base = -1, | |
85 | }; | |
86 | ||
3836309d | 87 | static int tps65912_gpio_probe(struct platform_device *pdev) |
668a6cc7 MO |
88 | { |
89 | struct tps65912 *tps65912 = dev_get_drvdata(pdev->dev.parent); | |
e56aee18 | 90 | struct tps65912_board *pdata = dev_get_platdata(tps65912->dev); |
668a6cc7 MO |
91 | struct tps65912_gpio_data *tps65912_gpio; |
92 | int ret; | |
93 | ||
45e253a7 AL |
94 | tps65912_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps65912_gpio), |
95 | GFP_KERNEL); | |
668a6cc7 MO |
96 | if (tps65912_gpio == NULL) |
97 | return -ENOMEM; | |
98 | ||
99 | tps65912_gpio->tps65912 = tps65912; | |
100 | tps65912_gpio->gpio_chip = template_chip; | |
101 | tps65912_gpio->gpio_chip.dev = &pdev->dev; | |
102 | if (pdata && pdata->gpio_base) | |
103 | tps65912_gpio->gpio_chip.base = pdata->gpio_base; | |
104 | ||
105 | ret = gpiochip_add(&tps65912_gpio->gpio_chip); | |
106 | if (ret < 0) { | |
107 | dev_err(&pdev->dev, "Failed to register gpiochip, %d\n", ret); | |
45e253a7 | 108 | return ret; |
668a6cc7 MO |
109 | } |
110 | ||
111 | platform_set_drvdata(pdev, tps65912_gpio); | |
112 | ||
113 | return ret; | |
668a6cc7 MO |
114 | } |
115 | ||
206210ce | 116 | static int tps65912_gpio_remove(struct platform_device *pdev) |
668a6cc7 MO |
117 | { |
118 | struct tps65912_gpio_data *tps65912_gpio = platform_get_drvdata(pdev); | |
668a6cc7 | 119 | |
9f5132ae | 120 | gpiochip_remove(&tps65912_gpio->gpio_chip); |
121 | return 0; | |
668a6cc7 MO |
122 | } |
123 | ||
124 | static struct platform_driver tps65912_gpio_driver = { | |
125 | .driver = { | |
126 | .name = "tps65912-gpio", | |
127 | .owner = THIS_MODULE, | |
128 | }, | |
129 | .probe = tps65912_gpio_probe, | |
8283c4ff | 130 | .remove = tps65912_gpio_remove, |
668a6cc7 MO |
131 | }; |
132 | ||
133 | static int __init tps65912_gpio_init(void) | |
134 | { | |
135 | return platform_driver_register(&tps65912_gpio_driver); | |
136 | } | |
137 | subsys_initcall(tps65912_gpio_init); | |
138 | ||
139 | static void __exit tps65912_gpio_exit(void) | |
140 | { | |
141 | platform_driver_unregister(&tps65912_gpio_driver); | |
142 | } | |
143 | module_exit(tps65912_gpio_exit); | |
144 | ||
145 | MODULE_AUTHOR("Margarita Olaya Cabrera <magi@slimlogic.co.uk>"); | |
146 | MODULE_DESCRIPTION("GPIO interface for TPS65912 PMICs"); | |
147 | MODULE_LICENSE("GPL v2"); | |
148 | MODULE_ALIAS("platform:tps65912-gpio"); |