1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * Copyright (C) 2015-2023 Texas Instruments Incorporated - https://www.ti.com/ |
4 | * Andrew Davis <afd@ti.com> |
5 | * |
6 | * Based on the TPS65912 driver |
7 | */ |
8 | |
9 | #include <linux/gpio/driver.h> |
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 GPIO_LINE_DIRECTION_OUT; |
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(gc: chip); |
38 | |
39 | /* Set the initial value */ |
40 | regmap_update_bits(map: gpio->tps->regmap, TPS65086_GPOCTRL, |
41 | BIT(4 + offset), val: 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(gc: chip); |
49 | int ret, val; |
50 | |
51 | ret = regmap_read(map: gpio->tps->regmap, TPS65086_GPOCTRL, val: &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(gc: chip); |
62 | |
63 | regmap_update_bits(map: gpio->tps->regmap, TPS65086_GPOCTRL, |
64 | BIT(4 + offset), val: value ? BIT(4 + offset) : 0); |
65 | } |
66 | |
67 | static const struct gpio_chip template_chip = { |
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 | |
84 | gpio = devm_kzalloc(dev: &pdev->dev, size: sizeof(*gpio), GFP_KERNEL); |
85 | if (!gpio) |
86 | return -ENOMEM; |
87 | |
88 | gpio->tps = dev_get_drvdata(dev: pdev->dev.parent); |
89 | gpio->chip = template_chip; |
90 | gpio->chip.parent = gpio->tps->dev; |
91 | |
92 | return devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio); |
93 | } |
94 | |
95 | static const struct platform_device_id tps65086_gpio_id_table[] = { |
96 | { "tps65086-gpio" , }, |
97 | { /* sentinel */ } |
98 | }; |
99 | MODULE_DEVICE_TABLE(platform, tps65086_gpio_id_table); |
100 | |
101 | static struct platform_driver tps65086_gpio_driver = { |
102 | .driver = { |
103 | .name = "tps65086-gpio" , |
104 | }, |
105 | .probe = tps65086_gpio_probe, |
106 | .id_table = tps65086_gpio_id_table, |
107 | }; |
108 | module_platform_driver(tps65086_gpio_driver); |
109 | |
110 | MODULE_AUTHOR("Andrew Davis <afd@ti.com>" ); |
111 | MODULE_DESCRIPTION("TPS65086 GPIO driver" ); |
112 | MODULE_LICENSE("GPL v2" ); |
113 | |