Commit | Line | Data |
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d5a4da15 | 1 | // SPDX-License-Identifier: GPL-2.0 |
99f0fd54 AD |
2 | /* |
3 | * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/ | |
4 | * Andrew F. Davis <afd@ti.com> | |
5 | * | |
99f0fd54 AD |
6 | * Based on the TPS65912 driver |
7 | */ | |
8 | ||
5d75683e | 9 | #include <linux/gpio/driver.h> |
99f0fd54 AD |
10 | #include <linux/module.h> |
11 | #include <linux/platform_device.h> | |
12 | ||
13 | #include <linux/mfd/tps65086.h> | |
14 | ||
15 | struct tps65086_gpio { | |
16 | struct gpio_chip chip; | |
17 | struct tps65086 *tps; | |
18 | }; | |
19 | ||
20 | static int tps65086_gpio_get_direction(struct gpio_chip *chip, | |
21 | unsigned offset) | |
22 | { | |
23 | /* This device is output only */ | |
24 | return 0; | |
25 | } | |
26 | ||
27 | static int tps65086_gpio_direction_input(struct gpio_chip *chip, | |
28 | unsigned offset) | |
29 | { | |
30 | /* This device is output only */ | |
31 | return -EINVAL; | |
32 | } | |
33 | ||
34 | static int tps65086_gpio_direction_output(struct gpio_chip *chip, | |
35 | unsigned offset, int value) | |
36 | { | |
37 | struct tps65086_gpio *gpio = gpiochip_get_data(chip); | |
38 | ||
39 | /* Set the initial value */ | |
40 | regmap_update_bits(gpio->tps->regmap, TPS65086_GPOCTRL, | |
41 | BIT(4 + offset), value ? BIT(4 + offset) : 0); | |
42 | ||
43 | return 0; | |
44 | } | |
45 | ||
46 | static int tps65086_gpio_get(struct gpio_chip *chip, unsigned offset) | |
47 | { | |
48 | struct tps65086_gpio *gpio = gpiochip_get_data(chip); | |
49 | int ret, val; | |
50 | ||
51 | ret = regmap_read(gpio->tps->regmap, TPS65086_GPOCTRL, &val); | |
52 | if (ret < 0) | |
53 | return ret; | |
54 | ||
55 | return val & BIT(4 + offset); | |
56 | } | |
57 | ||
58 | static void tps65086_gpio_set(struct gpio_chip *chip, unsigned offset, | |
59 | int value) | |
60 | { | |
61 | struct tps65086_gpio *gpio = gpiochip_get_data(chip); | |
62 | ||
63 | regmap_update_bits(gpio->tps->regmap, TPS65086_GPOCTRL, | |
64 | BIT(4 + offset), value ? BIT(4 + offset) : 0); | |
65 | } | |
66 | ||
e35b5ab0 | 67 | static const struct gpio_chip template_chip = { |
99f0fd54 AD |
68 | .label = "tps65086-gpio", |
69 | .owner = THIS_MODULE, | |
70 | .get_direction = tps65086_gpio_get_direction, | |
71 | .direction_input = tps65086_gpio_direction_input, | |
72 | .direction_output = tps65086_gpio_direction_output, | |
73 | .get = tps65086_gpio_get, | |
74 | .set = tps65086_gpio_set, | |
75 | .base = -1, | |
76 | .ngpio = 4, | |
77 | .can_sleep = true, | |
78 | }; | |
79 | ||
80 | static int tps65086_gpio_probe(struct platform_device *pdev) | |
81 | { | |
82 | struct tps65086_gpio *gpio; | |
83 | int ret; | |
84 | ||
85 | gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); | |
86 | if (!gpio) | |
87 | return -ENOMEM; | |
88 | ||
89 | platform_set_drvdata(pdev, gpio); | |
90 | ||
91 | gpio->tps = dev_get_drvdata(pdev->dev.parent); | |
92 | gpio->chip = template_chip; | |
93 | gpio->chip.parent = gpio->tps->dev; | |
94 | ||
95 | ret = gpiochip_add_data(&gpio->chip, gpio); | |
96 | if (ret < 0) { | |
97 | dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret); | |
98 | return ret; | |
99 | } | |
100 | ||
101 | return 0; | |
102 | } | |
103 | ||
104 | static int tps65086_gpio_remove(struct platform_device *pdev) | |
105 | { | |
106 | struct tps65086_gpio *gpio = platform_get_drvdata(pdev); | |
107 | ||
108 | gpiochip_remove(&gpio->chip); | |
109 | ||
110 | return 0; | |
111 | } | |
112 | ||
113 | static const struct platform_device_id tps65086_gpio_id_table[] = { | |
114 | { "tps65086-gpio", }, | |
115 | { /* sentinel */ } | |
116 | }; | |
117 | MODULE_DEVICE_TABLE(platform, tps65086_gpio_id_table); | |
118 | ||
119 | static struct platform_driver tps65086_gpio_driver = { | |
120 | .driver = { | |
121 | .name = "tps65086-gpio", | |
122 | }, | |
123 | .probe = tps65086_gpio_probe, | |
124 | .remove = tps65086_gpio_remove, | |
125 | .id_table = tps65086_gpio_id_table, | |
126 | }; | |
127 | module_platform_driver(tps65086_gpio_driver); | |
128 | ||
129 | MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>"); | |
130 | MODULE_DESCRIPTION("TPS65086 GPIO driver"); | |
131 | MODULE_LICENSE("GPL v2"); |