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