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/kernel.h>
12#include <linux/slab.h>
13#include <linux/module.h>
14#include <linux/gpio/driver.h>
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
22struct wm8350_gpio_data {
23 struct wm8350 *wm8350;
24 struct gpio_chip gpio_chip;
25};
26
27static int wm8350_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
28{
29 struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
30 struct wm8350 *wm8350 = wm8350_gpio->wm8350;
31
32 return wm8350_set_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O,
33 1 << offset);
34}
35
36static int wm8350_gpio_get(struct gpio_chip *chip, unsigned offset)
37{
38 struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
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
52static void wm8350_gpio_set(struct gpio_chip *chip, unsigned offset, 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 wm8350_set_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset);
59 else
60 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 wm8350_gpio_set(chip, offset, value);
77
78 return 0;
79}
80
81static int wm8350_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
82{
83 struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
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
92static const struct gpio_chip template_chip = {
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,
100 .can_sleep = true,
101};
102
103static int wm8350_gpio_probe(struct platform_device *pdev)
104{
105 struct wm8350 *wm8350 = dev_get_drvdata(pdev->dev.parent);
106 struct wm8350_platform_data *pdata = dev_get_platdata(wm8350->dev);
107 struct wm8350_gpio_data *wm8350_gpio;
108 int ret;
109
110 wm8350_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8350_gpio),
111 GFP_KERNEL);
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;
118 wm8350_gpio->gpio_chip.parent = &pdev->dev;
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
124 ret = devm_gpiochip_add_data(&pdev->dev, &wm8350_gpio->gpio_chip,
125 wm8350_gpio);
126 if (ret < 0) {
127 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
128 return ret;
129 }
130
131 platform_set_drvdata(pdev, wm8350_gpio);
132
133 return ret;
134}
135
136static struct platform_driver wm8350_gpio_driver = {
137 .driver.name = "wm8350-gpio",
138 .probe = wm8350_gpio_probe,
139};
140
141static int __init wm8350_gpio_init(void)
142{
143 return platform_driver_register(&wm8350_gpio_driver);
144}
145subsys_initcall(wm8350_gpio_init);
146
147static void __exit wm8350_gpio_exit(void)
148{
149 platform_driver_unregister(&wm8350_gpio_driver);
150}
151module_exit(wm8350_gpio_exit);
152
153MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
154MODULE_DESCRIPTION("GPIO interface for WM8350 PMICs");
155MODULE_LICENSE("GPL");
156MODULE_ALIAS("platform:wm8350-gpio");
157