Commit | Line | Data |
---|---|---|
b9f71d14 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
93847930 | 2 | /* |
2e35627e | 3 | * ROHM BD9571MWV-M and BD9574MWF-M GPIO driver |
93847930 MV |
4 | * |
5 | * Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@gmail.com> | |
6 | * | |
93847930 MV |
7 | * Based on the TPS65086 driver |
8 | * | |
9 | * NOTE: Interrupts are not supported yet. | |
10 | */ | |
11 | ||
12 | #include <linux/gpio/driver.h> | |
2e35627e | 13 | #include <linux/mfd/rohm-generic.h> |
93847930 MV |
14 | #include <linux/module.h> |
15 | #include <linux/platform_device.h> | |
16 | ||
17 | #include <linux/mfd/bd9571mwv.h> | |
18 | ||
19 | struct bd9571mwv_gpio { | |
2d7af444 | 20 | struct regmap *regmap; |
93847930 | 21 | struct gpio_chip chip; |
93847930 MV |
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(chip); | |
28 | int ret, val; | |
29 | ||
2d7af444 | 30 | ret = regmap_read(gpio->regmap, BD9571MWV_GPIO_DIR, &val); |
93847930 MV |
31 | if (ret < 0) |
32 | return ret; | |
e42615ec MV |
33 | if (val & BIT(offset)) |
34 | return GPIO_LINE_DIRECTION_IN; | |
93847930 | 35 | |
e42615ec | 36 | return GPIO_LINE_DIRECTION_OUT; |
93847930 MV |
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(chip); | |
43 | ||
2d7af444 | 44 | regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_DIR, BIT(offset), 0); |
93847930 MV |
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(chip); | |
53 | ||
54 | /* Set the initial value */ | |
2d7af444 | 55 | regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_OUT, |
93847930 | 56 | BIT(offset), value ? BIT(offset) : 0); |
2d7af444 | 57 | regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_DIR, |
93847930 MV |
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(chip); | |
66 | int ret, val; | |
67 | ||
2d7af444 | 68 | ret = regmap_read(gpio->regmap, BD9571MWV_GPIO_IN, &val); |
93847930 MV |
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(chip); | |
79 | ||
2d7af444 | 80 | regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_OUT, |
93847930 MV |
81 | BIT(offset), 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 | int ret; | |
101 | ||
102 | gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); | |
103 | if (!gpio) | |
104 | return -ENOMEM; | |
105 | ||
106 | platform_set_drvdata(pdev, gpio); | |
107 | ||
2d7af444 | 108 | gpio->regmap = dev_get_regmap(pdev->dev.parent, NULL); |
93847930 | 109 | gpio->chip = template_chip; |
2d7af444 | 110 | gpio->chip.parent = pdev->dev.parent; |
93847930 MV |
111 | |
112 | ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio); | |
113 | if (ret < 0) { | |
114 | dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret); | |
115 | return ret; | |
116 | } | |
117 | ||
118 | return 0; | |
119 | } | |
120 | ||
121 | static const struct platform_device_id bd9571mwv_gpio_id_table[] = { | |
2e35627e YS |
122 | { "bd9571mwv-gpio", ROHM_CHIP_TYPE_BD9571 }, |
123 | { "bd9574mwf-gpio", ROHM_CHIP_TYPE_BD9574 }, | |
93847930 MV |
124 | { /* sentinel */ } |
125 | }; | |
126 | MODULE_DEVICE_TABLE(platform, bd9571mwv_gpio_id_table); | |
127 | ||
128 | static struct platform_driver bd9571mwv_gpio_driver = { | |
129 | .driver = { | |
130 | .name = "bd9571mwv-gpio", | |
131 | }, | |
132 | .probe = bd9571mwv_gpio_probe, | |
133 | .id_table = bd9571mwv_gpio_id_table, | |
134 | }; | |
135 | module_platform_driver(bd9571mwv_gpio_driver); | |
136 | ||
137 | MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@gmail.com>"); | |
138 | MODULE_DESCRIPTION("BD9571MWV GPIO driver"); | |
139 | MODULE_LICENSE("GPL v2"); |