1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * ROHM BD9571MWV-M and BD9574MWF-M GPIO driver |
4 | * |
5 | * Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@gmail.com> |
6 | * |
7 | * Based on the TPS65086 driver |
8 | * |
9 | * NOTE: Interrupts are not supported yet. |
10 | */ |
11 | |
12 | #include <linux/gpio/driver.h> |
13 | #include <linux/mfd/rohm-generic.h> |
14 | #include <linux/module.h> |
15 | #include <linux/platform_device.h> |
16 | |
17 | #include <linux/mfd/bd9571mwv.h> |
18 | |
19 | struct bd9571mwv_gpio { |
20 | struct regmap *regmap; |
21 | struct gpio_chip chip; |
22 | }; |
23 | |
24 | static int bd9571mwv_gpio_get_direction(struct gpio_chip *chip, |
25 | unsigned int offset) |
26 | { |
27 | struct bd9571mwv_gpio *gpio = gpiochip_get_data(gc: chip); |
28 | int ret, val; |
29 | |
30 | ret = regmap_read(map: gpio->regmap, BD9571MWV_GPIO_DIR, val: &val); |
31 | if (ret < 0) |
32 | return ret; |
33 | if (val & BIT(offset)) |
34 | return GPIO_LINE_DIRECTION_IN; |
35 | |
36 | return GPIO_LINE_DIRECTION_OUT; |
37 | } |
38 | |
39 | static int bd9571mwv_gpio_direction_input(struct gpio_chip *chip, |
40 | unsigned int offset) |
41 | { |
42 | struct bd9571mwv_gpio *gpio = gpiochip_get_data(gc: chip); |
43 | |
44 | regmap_update_bits(map: gpio->regmap, BD9571MWV_GPIO_DIR, BIT(offset), val: 0); |
45 | |
46 | return 0; |
47 | } |
48 | |
49 | static int bd9571mwv_gpio_direction_output(struct gpio_chip *chip, |
50 | unsigned int offset, int value) |
51 | { |
52 | struct bd9571mwv_gpio *gpio = gpiochip_get_data(gc: chip); |
53 | |
54 | /* Set the initial value */ |
55 | regmap_update_bits(map: gpio->regmap, BD9571MWV_GPIO_OUT, |
56 | BIT(offset), val: value ? BIT(offset) : 0); |
57 | regmap_update_bits(map: gpio->regmap, BD9571MWV_GPIO_DIR, |
58 | BIT(offset), BIT(offset)); |
59 | |
60 | return 0; |
61 | } |
62 | |
63 | static int bd9571mwv_gpio_get(struct gpio_chip *chip, unsigned int offset) |
64 | { |
65 | struct bd9571mwv_gpio *gpio = gpiochip_get_data(gc: chip); |
66 | int ret, val; |
67 | |
68 | ret = regmap_read(map: gpio->regmap, BD9571MWV_GPIO_IN, val: &val); |
69 | if (ret < 0) |
70 | return ret; |
71 | |
72 | return val & BIT(offset); |
73 | } |
74 | |
75 | static void bd9571mwv_gpio_set(struct gpio_chip *chip, unsigned int offset, |
76 | int value) |
77 | { |
78 | struct bd9571mwv_gpio *gpio = gpiochip_get_data(gc: chip); |
79 | |
80 | regmap_update_bits(map: gpio->regmap, BD9571MWV_GPIO_OUT, |
81 | BIT(offset), val: value ? BIT(offset) : 0); |
82 | } |
83 | |
84 | static const struct gpio_chip template_chip = { |
85 | .label = "bd9571mwv-gpio" , |
86 | .owner = THIS_MODULE, |
87 | .get_direction = bd9571mwv_gpio_get_direction, |
88 | .direction_input = bd9571mwv_gpio_direction_input, |
89 | .direction_output = bd9571mwv_gpio_direction_output, |
90 | .get = bd9571mwv_gpio_get, |
91 | .set = bd9571mwv_gpio_set, |
92 | .base = -1, |
93 | .ngpio = 2, |
94 | .can_sleep = true, |
95 | }; |
96 | |
97 | static int bd9571mwv_gpio_probe(struct platform_device *pdev) |
98 | { |
99 | struct bd9571mwv_gpio *gpio; |
100 | |
101 | gpio = devm_kzalloc(dev: &pdev->dev, size: sizeof(*gpio), GFP_KERNEL); |
102 | if (!gpio) |
103 | return -ENOMEM; |
104 | |
105 | gpio->regmap = dev_get_regmap(dev: pdev->dev.parent, NULL); |
106 | gpio->chip = template_chip; |
107 | gpio->chip.parent = pdev->dev.parent; |
108 | |
109 | return devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio); |
110 | } |
111 | |
112 | static const struct platform_device_id bd9571mwv_gpio_id_table[] = { |
113 | { "bd9571mwv-gpio" , ROHM_CHIP_TYPE_BD9571 }, |
114 | { "bd9574mwf-gpio" , ROHM_CHIP_TYPE_BD9574 }, |
115 | { /* sentinel */ } |
116 | }; |
117 | MODULE_DEVICE_TABLE(platform, bd9571mwv_gpio_id_table); |
118 | |
119 | static struct platform_driver bd9571mwv_gpio_driver = { |
120 | .driver = { |
121 | .name = "bd9571mwv-gpio" , |
122 | }, |
123 | .probe = bd9571mwv_gpio_probe, |
124 | .id_table = bd9571mwv_gpio_id_table, |
125 | }; |
126 | module_platform_driver(bd9571mwv_gpio_driver); |
127 | |
128 | MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@gmail.com>" ); |
129 | MODULE_DESCRIPTION("BD9571MWV GPIO driver" ); |
130 | MODULE_LICENSE("GPL v2" ); |
131 | |