tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
21struct wm8350_gpio_data {
22 struct wm8350 *wm8350;
23 struct gpio_chip gpio_chip;
24};
25
26static int wm8350_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
27{
28 struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
29 struct wm8350 *wm8350 = wm8350_gpio->wm8350;
30
31 return wm8350_set_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O,
32 1 << offset);
33}
34
35static int wm8350_gpio_get(struct gpio_chip *chip, unsigned offset)
36{
37 struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(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
51static int wm8350_gpio_set(struct gpio_chip *chip, unsigned int offset,
52 int value)
53{
54 struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
55 struct wm8350 *wm8350 = wm8350_gpio->wm8350;
56
57 if (value)
58 return wm8350_set_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset);
59
60 return wm8350_clear_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset);
61}
62
63static int wm8350_gpio_direction_out(struct gpio_chip *chip,
64 unsigned offset, int value)
65{
66 struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
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 return wm8350_gpio_set(chip, offset, value);
77}
78
79static int wm8350_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
80{
81 struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
82 struct wm8350 *wm8350 = wm8350_gpio->wm8350;
83
84 if (!wm8350->irq_base)
85 return -EINVAL;
86
87 return wm8350->irq_base + WM8350_IRQ_GPIO(offset);
88}
89
90static const struct gpio_chip template_chip = {
91 .label = "wm8350",
92 .owner = THIS_MODULE,
93 .direction_input = wm8350_gpio_direction_in,
94 .get = wm8350_gpio_get,
95 .direction_output = wm8350_gpio_direction_out,
96 .set = wm8350_gpio_set,
97 .to_irq = wm8350_gpio_to_irq,
98 .can_sleep = true,
99};
100
101static int wm8350_gpio_probe(struct platform_device *pdev)
102{
103 struct wm8350 *wm8350 = dev_get_drvdata(pdev->dev.parent);
104 struct wm8350_platform_data *pdata = dev_get_platdata(wm8350->dev);
105 struct wm8350_gpio_data *wm8350_gpio;
106
107 wm8350_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8350_gpio),
108 GFP_KERNEL);
109 if (wm8350_gpio == NULL)
110 return -ENOMEM;
111
112 wm8350_gpio->wm8350 = wm8350;
113 wm8350_gpio->gpio_chip = template_chip;
114 wm8350_gpio->gpio_chip.ngpio = 13;
115 wm8350_gpio->gpio_chip.parent = &pdev->dev;
116 if (pdata && pdata->gpio_base)
117 wm8350_gpio->gpio_chip.base = pdata->gpio_base;
118 else
119 wm8350_gpio->gpio_chip.base = -1;
120
121 return devm_gpiochip_add_data(&pdev->dev, &wm8350_gpio->gpio_chip, wm8350_gpio);
122}
123
124static struct platform_driver wm8350_gpio_driver = {
125 .driver.name = "wm8350-gpio",
126 .probe = wm8350_gpio_probe,
127};
128
129static int __init wm8350_gpio_init(void)
130{
131 return platform_driver_register(&wm8350_gpio_driver);
132}
133subsys_initcall(wm8350_gpio_init);
134
135static void __exit wm8350_gpio_exit(void)
136{
137 platform_driver_unregister(&wm8350_gpio_driver);
138}
139module_exit(wm8350_gpio_exit);
140
141MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
142MODULE_DESCRIPTION("GPIO interface for WM8350 PMICs");
143MODULE_LICENSE("GPL");
144MODULE_ALIAS("platform:wm8350-gpio");