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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux...
[karo-tx-linux.git] / drivers / gpio / gpio-tps65912.c
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);
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,
82         .can_sleep              = true,
83         .ngpio                  = 5,
84         .base                   = -1,
85 };
86
87 static int tps65912_gpio_probe(struct platform_device *pdev)
88 {
89         struct tps65912 *tps65912 = dev_get_drvdata(pdev->dev.parent);
90         struct tps65912_board *pdata = dev_get_platdata(tps65912->dev);
91         struct tps65912_gpio_data *tps65912_gpio;
92         int ret;
93
94         tps65912_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps65912_gpio),
95                                      GFP_KERNEL);
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);
108                 return ret;
109         }
110
111         platform_set_drvdata(pdev, tps65912_gpio);
112
113         return ret;
114 }
115
116 static int tps65912_gpio_remove(struct platform_device *pdev)
117 {
118         struct tps65912_gpio_data  *tps65912_gpio = platform_get_drvdata(pdev);
119
120         return gpiochip_remove(&tps65912_gpio->gpio_chip);
121 }
122
123 static struct platform_driver tps65912_gpio_driver = {
124         .driver = {
125                 .name = "tps65912-gpio",
126                 .owner = THIS_MODULE,
127         },
128         .probe = tps65912_gpio_probe,
129         .remove = tps65912_gpio_remove,
130 };
131
132 static int __init tps65912_gpio_init(void)
133 {
134         return platform_driver_register(&tps65912_gpio_driver);
135 }
136 subsys_initcall(tps65912_gpio_init);
137
138 static void __exit tps65912_gpio_exit(void)
139 {
140         platform_driver_unregister(&tps65912_gpio_driver);
141 }
142 module_exit(tps65912_gpio_exit);
143
144 MODULE_AUTHOR("Margarita Olaya Cabrera <magi@slimlogic.co.uk>");
145 MODULE_DESCRIPTION("GPIO interface for TPS65912 PMICs");
146 MODULE_LICENSE("GPL v2");
147 MODULE_ALIAS("platform:tps65912-gpio");