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[karo-tx-linux.git] / drivers / gpio / gpio-tps65086.c
1 /*
2  * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
3  *      Andrew F. Davis <afd@ti.com>
4  *
5  * This program is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU General Public License version 2 as
7  * published by the Free Software Foundation.
8  *
9  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
10  * kind, whether expressed or implied; without even the implied warranty
11  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License version 2 for more details.
13  *
14  * Based on the TPS65912 driver
15  */
16
17 #include <linux/gpio.h>
18 #include <linux/module.h>
19 #include <linux/platform_device.h>
20
21 #include <linux/mfd/tps65086.h>
22
23 struct tps65086_gpio {
24         struct gpio_chip chip;
25         struct tps65086 *tps;
26 };
27
28 static int tps65086_gpio_get_direction(struct gpio_chip *chip,
29                                        unsigned offset)
30 {
31         /* This device is output only */
32         return 0;
33 }
34
35 static int tps65086_gpio_direction_input(struct gpio_chip *chip,
36                                          unsigned offset)
37 {
38         /* This device is output only */
39         return -EINVAL;
40 }
41
42 static int tps65086_gpio_direction_output(struct gpio_chip *chip,
43                                           unsigned offset, int value)
44 {
45         struct tps65086_gpio *gpio = gpiochip_get_data(chip);
46
47         /* Set the initial value */
48         regmap_update_bits(gpio->tps->regmap, TPS65086_GPOCTRL,
49                            BIT(4 + offset), value ? BIT(4 + offset) : 0);
50
51         return 0;
52 }
53
54 static int tps65086_gpio_get(struct gpio_chip *chip, unsigned offset)
55 {
56         struct tps65086_gpio *gpio = gpiochip_get_data(chip);
57         int ret, val;
58
59         ret = regmap_read(gpio->tps->regmap, TPS65086_GPOCTRL, &val);
60         if (ret < 0)
61                 return ret;
62
63         return val & BIT(4 + offset);
64 }
65
66 static void tps65086_gpio_set(struct gpio_chip *chip, unsigned offset,
67                               int value)
68 {
69         struct tps65086_gpio *gpio = gpiochip_get_data(chip);
70
71         regmap_update_bits(gpio->tps->regmap, TPS65086_GPOCTRL,
72                            BIT(4 + offset), value ? BIT(4 + offset) : 0);
73 }
74
75 static struct gpio_chip template_chip = {
76         .label                  = "tps65086-gpio",
77         .owner                  = THIS_MODULE,
78         .get_direction          = tps65086_gpio_get_direction,
79         .direction_input        = tps65086_gpio_direction_input,
80         .direction_output       = tps65086_gpio_direction_output,
81         .get                    = tps65086_gpio_get,
82         .set                    = tps65086_gpio_set,
83         .base                   = -1,
84         .ngpio                  = 4,
85         .can_sleep              = true,
86 };
87
88 static int tps65086_gpio_probe(struct platform_device *pdev)
89 {
90         struct tps65086_gpio *gpio;
91         int ret;
92
93         gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
94         if (!gpio)
95                 return -ENOMEM;
96
97         platform_set_drvdata(pdev, gpio);
98
99         gpio->tps = dev_get_drvdata(pdev->dev.parent);
100         gpio->chip = template_chip;
101         gpio->chip.parent = gpio->tps->dev;
102
103         ret = gpiochip_add_data(&gpio->chip, gpio);
104         if (ret < 0) {
105                 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
106                 return ret;
107         }
108
109         return 0;
110 }
111
112 static int tps65086_gpio_remove(struct platform_device *pdev)
113 {
114         struct tps65086_gpio *gpio = platform_get_drvdata(pdev);
115
116         gpiochip_remove(&gpio->chip);
117
118         return 0;
119 }
120
121 static const struct platform_device_id tps65086_gpio_id_table[] = {
122         { "tps65086-gpio", },
123         { /* sentinel */ }
124 };
125 MODULE_DEVICE_TABLE(platform, tps65086_gpio_id_table);
126
127 static struct platform_driver tps65086_gpio_driver = {
128         .driver = {
129                 .name = "tps65086-gpio",
130         },
131         .probe = tps65086_gpio_probe,
132         .remove = tps65086_gpio_remove,
133         .id_table = tps65086_gpio_id_table,
134 };
135 module_platform_driver(tps65086_gpio_driver);
136
137 MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
138 MODULE_DESCRIPTION("TPS65086 GPIO driver");
139 MODULE_LICENSE("GPL v2");