1 // SPDX-License-Identifier: GPL-2.0+
3 * gpiolib support for Wolfson WM835x PMICs
5 * Copyright 2009 Wolfson Microelectronics PLC.
7 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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>
19 #include <linux/mfd/wm8350/core.h>
20 #include <linux/mfd/wm8350/gpio.h>
22 struct wm8350_gpio_data {
23 struct wm8350 *wm8350;
24 struct gpio_chip gpio_chip;
27 static int wm8350_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
29 struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
30 struct wm8350 *wm8350 = wm8350_gpio->wm8350;
32 return wm8350_set_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O,
36 static int wm8350_gpio_get(struct gpio_chip *chip, unsigned offset)
38 struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
39 struct wm8350 *wm8350 = wm8350_gpio->wm8350;
42 ret = wm8350_reg_read(wm8350, WM8350_GPIO_LEVEL);
46 if (ret & (1 << offset))
52 static void wm8350_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
54 struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
55 struct wm8350 *wm8350 = wm8350_gpio->wm8350;
58 wm8350_set_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset);
60 wm8350_clear_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset);
63 static int wm8350_gpio_direction_out(struct gpio_chip *chip,
64 unsigned offset, int value)
66 struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
67 struct wm8350 *wm8350 = wm8350_gpio->wm8350;
70 ret = wm8350_clear_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O,
75 /* Don't have an atomic direction/value setup */
76 wm8350_gpio_set(chip, offset, value);
81 static int wm8350_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
83 struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
84 struct wm8350 *wm8350 = wm8350_gpio->wm8350;
86 if (!wm8350->irq_base)
89 return wm8350->irq_base + WM8350_IRQ_GPIO(offset);
92 static const struct gpio_chip template_chip = {
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,
103 static int wm8350_gpio_probe(struct platform_device *pdev)
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;
109 wm8350_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8350_gpio),
111 if (wm8350_gpio == NULL)
114 wm8350_gpio->wm8350 = wm8350;
115 wm8350_gpio->gpio_chip = template_chip;
116 wm8350_gpio->gpio_chip.ngpio = 13;
117 wm8350_gpio->gpio_chip.parent = &pdev->dev;
118 if (pdata && pdata->gpio_base)
119 wm8350_gpio->gpio_chip.base = pdata->gpio_base;
121 wm8350_gpio->gpio_chip.base = -1;
123 return devm_gpiochip_add_data(&pdev->dev, &wm8350_gpio->gpio_chip, wm8350_gpio);
126 static struct platform_driver wm8350_gpio_driver = {
127 .driver.name = "wm8350-gpio",
128 .probe = wm8350_gpio_probe,
131 static int __init wm8350_gpio_init(void)
133 return platform_driver_register(&wm8350_gpio_driver);
135 subsys_initcall(wm8350_gpio_init);
137 static void __exit wm8350_gpio_exit(void)
139 platform_driver_unregister(&wm8350_gpio_driver);
141 module_exit(wm8350_gpio_exit);
143 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
144 MODULE_DESCRIPTION("GPIO interface for WM8350 PMICs");
145 MODULE_LICENSE("GPL");
146 MODULE_ALIAS("platform:wm8350-gpio");