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1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // Copyright (c) 2019, Linaro Limited | |
3 | ||
e91d0f05 | 4 | #include <linux/mod_devicetable.h> |
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5 | #include <linux/module.h> |
6 | #include <linux/gpio/driver.h> | |
e91d0f05 | 7 | #include <linux/platform_device.h> |
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8 | #include <linux/regmap.h> |
9 | #include <linux/slab.h> | |
59c32468 | 10 | |
dbec64b1 | 11 | #define WCD_PIN_MASK(p) BIT(p) |
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12 | #define WCD_REG_DIR_CTL_OFFSET 0x42 |
13 | #define WCD_REG_VAL_CTL_OFFSET 0x43 | |
14 | #define WCD934X_NPINS 5 | |
15 | ||
16 | struct wcd_gpio_data { | |
17 | struct regmap *map; | |
18 | struct gpio_chip chip; | |
19 | }; | |
20 | ||
21 | static int wcd_gpio_get_direction(struct gpio_chip *chip, unsigned int pin) | |
22 | { | |
23 | struct wcd_gpio_data *data = gpiochip_get_data(chip); | |
24 | unsigned int value; | |
25 | int ret; | |
26 | ||
27 | ret = regmap_read(data->map, WCD_REG_DIR_CTL_OFFSET, &value); | |
28 | if (ret < 0) | |
29 | return ret; | |
30 | ||
31 | if (value & WCD_PIN_MASK(pin)) | |
32 | return GPIO_LINE_DIRECTION_OUT; | |
33 | ||
34 | return GPIO_LINE_DIRECTION_IN; | |
35 | } | |
36 | ||
37 | static int wcd_gpio_direction_input(struct gpio_chip *chip, unsigned int pin) | |
38 | { | |
39 | struct wcd_gpio_data *data = gpiochip_get_data(chip); | |
40 | ||
41 | return regmap_update_bits(data->map, WCD_REG_DIR_CTL_OFFSET, | |
42 | WCD_PIN_MASK(pin), 0); | |
43 | } | |
44 | ||
45 | static int wcd_gpio_direction_output(struct gpio_chip *chip, unsigned int pin, | |
46 | int val) | |
47 | { | |
48 | struct wcd_gpio_data *data = gpiochip_get_data(chip); | |
49 | ||
50 | regmap_update_bits(data->map, WCD_REG_DIR_CTL_OFFSET, | |
51 | WCD_PIN_MASK(pin), WCD_PIN_MASK(pin)); | |
52 | ||
53 | return regmap_update_bits(data->map, WCD_REG_VAL_CTL_OFFSET, | |
54 | WCD_PIN_MASK(pin), | |
55 | val ? WCD_PIN_MASK(pin) : 0); | |
56 | } | |
57 | ||
58 | static int wcd_gpio_get(struct gpio_chip *chip, unsigned int pin) | |
59 | { | |
60 | struct wcd_gpio_data *data = gpiochip_get_data(chip); | |
47203198 | 61 | unsigned int value; |
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62 | |
63 | regmap_read(data->map, WCD_REG_VAL_CTL_OFFSET, &value); | |
64 | ||
47203198 | 65 | return !!(value & WCD_PIN_MASK(pin)); |
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66 | } |
67 | ||
68 | static void wcd_gpio_set(struct gpio_chip *chip, unsigned int pin, int val) | |
69 | { | |
47d7d116 AL |
70 | struct wcd_gpio_data *data = gpiochip_get_data(chip); |
71 | ||
72 | regmap_update_bits(data->map, WCD_REG_VAL_CTL_OFFSET, | |
73 | WCD_PIN_MASK(pin), val ? WCD_PIN_MASK(pin) : 0); | |
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74 | } |
75 | ||
76 | static int wcd_gpio_probe(struct platform_device *pdev) | |
77 | { | |
78 | struct device *dev = &pdev->dev; | |
79 | struct wcd_gpio_data *data; | |
80 | struct gpio_chip *chip; | |
81 | ||
82 | data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); | |
83 | if (!data) | |
84 | return -ENOMEM; | |
85 | ||
86 | data->map = dev_get_regmap(dev->parent, NULL); | |
87 | if (!data->map) { | |
88 | dev_err(dev, "%s: failed to get regmap\n", __func__); | |
89 | return -EINVAL; | |
90 | } | |
91 | ||
92 | chip = &data->chip; | |
93 | chip->direction_input = wcd_gpio_direction_input; | |
94 | chip->direction_output = wcd_gpio_direction_output; | |
95 | chip->get_direction = wcd_gpio_get_direction; | |
96 | chip->get = wcd_gpio_get; | |
97 | chip->set = wcd_gpio_set; | |
98 | chip->parent = dev; | |
99 | chip->base = -1; | |
100 | chip->ngpio = WCD934X_NPINS; | |
101 | chip->label = dev_name(dev); | |
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102 | chip->can_sleep = false; |
103 | ||
104 | return devm_gpiochip_add_data(dev, chip, data); | |
105 | } | |
106 | ||
107 | static const struct of_device_id wcd_gpio_of_match[] = { | |
108 | { .compatible = "qcom,wcd9340-gpio" }, | |
109 | { .compatible = "qcom,wcd9341-gpio" }, | |
110 | { } | |
111 | }; | |
112 | MODULE_DEVICE_TABLE(of, wcd_gpio_of_match); | |
113 | ||
114 | static struct platform_driver wcd_gpio_driver = { | |
115 | .driver = { | |
116 | .name = "wcd934x-gpio", | |
117 | .of_match_table = wcd_gpio_of_match, | |
118 | }, | |
119 | .probe = wcd_gpio_probe, | |
120 | }; | |
121 | ||
122 | module_platform_driver(wcd_gpio_driver); | |
123 | MODULE_DESCRIPTION("Qualcomm Technologies, Inc WCD GPIO control driver"); | |
124 | MODULE_LICENSE("GPL v2"); |