Commit | Line | Data |
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66dbe750 | 1 | // SPDX-License-Identifier: GPL-2.0+ |
38f6ce45 | 2 | /* |
c103de24 | 3 | * gpiolib support for Wolfson WM835x PMICs |
38f6ce45 MB |
4 | * |
5 | * Copyright 2009 Wolfson Microelectronics PLC. | |
6 | * | |
7 | * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> | |
8 | * | |
38f6ce45 MB |
9 | */ |
10 | ||
11 | #include <linux/kernel.h> | |
5a0e3ad6 | 12 | #include <linux/slab.h> |
38f6ce45 | 13 | #include <linux/module.h> |
10833c4b | 14 | #include <linux/gpio/driver.h> |
38f6ce45 MB |
15 | #include <linux/mfd/core.h> |
16 | #include <linux/platform_device.h> | |
17 | #include <linux/seq_file.h> | |
18 | ||
19 | #include <linux/mfd/wm8350/core.h> | |
20 | #include <linux/mfd/wm8350/gpio.h> | |
21 | ||
22 | struct wm8350_gpio_data { | |
23 | struct wm8350 *wm8350; | |
24 | struct gpio_chip gpio_chip; | |
25 | }; | |
26 | ||
38f6ce45 MB |
27 | static int wm8350_gpio_direction_in(struct gpio_chip *chip, unsigned offset) |
28 | { | |
dfcdf721 | 29 | struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip); |
38f6ce45 MB |
30 | struct wm8350 *wm8350 = wm8350_gpio->wm8350; |
31 | ||
32 | return wm8350_set_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O, | |
33 | 1 << offset); | |
34 | } | |
35 | ||
36 | static int wm8350_gpio_get(struct gpio_chip *chip, unsigned offset) | |
37 | { | |
dfcdf721 | 38 | struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip); |
38f6ce45 MB |
39 | struct wm8350 *wm8350 = wm8350_gpio->wm8350; |
40 | int ret; | |
41 | ||
42 | ret = wm8350_reg_read(wm8350, WM8350_GPIO_LEVEL); | |
43 | if (ret < 0) | |
44 | return ret; | |
45 | ||
46 | if (ret & (1 << offset)) | |
47 | return 1; | |
48 | else | |
49 | return 0; | |
50 | } | |
51 | ||
52 | static void wm8350_gpio_set(struct gpio_chip *chip, unsigned offset, int value) | |
53 | { | |
dfcdf721 | 54 | struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip); |
38f6ce45 MB |
55 | struct wm8350 *wm8350 = wm8350_gpio->wm8350; |
56 | ||
57 | if (value) | |
58 | wm8350_set_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset); | |
59 | else | |
60 | wm8350_clear_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset); | |
61 | } | |
62 | ||
63 | static int wm8350_gpio_direction_out(struct gpio_chip *chip, | |
64 | unsigned offset, int value) | |
65 | { | |
dfcdf721 | 66 | struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip); |
38f6ce45 MB |
67 | struct wm8350 *wm8350 = wm8350_gpio->wm8350; |
68 | int ret; | |
69 | ||
70 | ret = wm8350_clear_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O, | |
71 | 1 << offset); | |
72 | if (ret < 0) | |
73 | return ret; | |
74 | ||
75 | /* Don't have an atomic direction/value setup */ | |
76 | wm8350_gpio_set(chip, offset, value); | |
77 | ||
78 | return 0; | |
79 | } | |
80 | ||
81 | static int wm8350_gpio_to_irq(struct gpio_chip *chip, unsigned offset) | |
82 | { | |
dfcdf721 | 83 | struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip); |
38f6ce45 MB |
84 | struct wm8350 *wm8350 = wm8350_gpio->wm8350; |
85 | ||
86 | if (!wm8350->irq_base) | |
87 | return -EINVAL; | |
88 | ||
89 | return wm8350->irq_base + WM8350_IRQ_GPIO(offset); | |
90 | } | |
91 | ||
e35b5ab0 | 92 | static const struct gpio_chip template_chip = { |
38f6ce45 MB |
93 | .label = "wm8350", |
94 | .owner = THIS_MODULE, | |
95 | .direction_input = wm8350_gpio_direction_in, | |
96 | .get = wm8350_gpio_get, | |
97 | .direction_output = wm8350_gpio_direction_out, | |
98 | .set = wm8350_gpio_set, | |
99 | .to_irq = wm8350_gpio_to_irq, | |
9fb1f39e | 100 | .can_sleep = true, |
38f6ce45 MB |
101 | }; |
102 | ||
3836309d | 103 | static int wm8350_gpio_probe(struct platform_device *pdev) |
38f6ce45 MB |
104 | { |
105 | struct wm8350 *wm8350 = dev_get_drvdata(pdev->dev.parent); | |
e56aee18 | 106 | struct wm8350_platform_data *pdata = dev_get_platdata(wm8350->dev); |
38f6ce45 MB |
107 | struct wm8350_gpio_data *wm8350_gpio; |
108 | int ret; | |
109 | ||
5b425438 AL |
110 | wm8350_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8350_gpio), |
111 | GFP_KERNEL); | |
38f6ce45 MB |
112 | if (wm8350_gpio == NULL) |
113 | return -ENOMEM; | |
114 | ||
115 | wm8350_gpio->wm8350 = wm8350; | |
116 | wm8350_gpio->gpio_chip = template_chip; | |
117 | wm8350_gpio->gpio_chip.ngpio = 13; | |
58383c78 | 118 | wm8350_gpio->gpio_chip.parent = &pdev->dev; |
38f6ce45 MB |
119 | if (pdata && pdata->gpio_base) |
120 | wm8350_gpio->gpio_chip.base = pdata->gpio_base; | |
121 | else | |
122 | wm8350_gpio->gpio_chip.base = -1; | |
123 | ||
4a4925cf LD |
124 | ret = devm_gpiochip_add_data(&pdev->dev, &wm8350_gpio->gpio_chip, |
125 | wm8350_gpio); | |
38f6ce45 | 126 | if (ret < 0) { |
5b425438 AL |
127 | dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret); |
128 | return ret; | |
38f6ce45 MB |
129 | } |
130 | ||
131 | platform_set_drvdata(pdev, wm8350_gpio); | |
132 | ||
133 | return ret; | |
38f6ce45 MB |
134 | } |
135 | ||
38f6ce45 MB |
136 | static struct platform_driver wm8350_gpio_driver = { |
137 | .driver.name = "wm8350-gpio", | |
38f6ce45 | 138 | .probe = wm8350_gpio_probe, |
38f6ce45 MB |
139 | }; |
140 | ||
141 | static int __init wm8350_gpio_init(void) | |
142 | { | |
143 | return platform_driver_register(&wm8350_gpio_driver); | |
144 | } | |
145 | subsys_initcall(wm8350_gpio_init); | |
146 | ||
147 | static void __exit wm8350_gpio_exit(void) | |
148 | { | |
149 | platform_driver_unregister(&wm8350_gpio_driver); | |
150 | } | |
151 | module_exit(wm8350_gpio_exit); | |
152 | ||
153 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
154 | MODULE_DESCRIPTION("GPIO interface for WM8350 PMICs"); | |
155 | MODULE_LICENSE("GPL"); | |
156 | MODULE_ALIAS("platform:wm8350-gpio"); |