157 lines
3.9 KiB
C
157 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* gpiolib support for Wolfson WM835x PMICs
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*
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* Copyright 2009 Wolfson Microelectronics PLC.
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*
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* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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*
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/gpio/driver.h>
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#include <linux/mfd/core.h>
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#include <linux/platform_device.h>
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#include <linux/seq_file.h>
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#include <linux/mfd/wm8350/core.h>
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#include <linux/mfd/wm8350/gpio.h>
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struct wm8350_gpio_data {
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struct wm8350 *wm8350;
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struct gpio_chip gpio_chip;
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};
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static int wm8350_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
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{
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struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
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struct wm8350 *wm8350 = wm8350_gpio->wm8350;
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return wm8350_set_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O,
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1 << offset);
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}
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static int wm8350_gpio_get(struct gpio_chip *chip, unsigned offset)
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{
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struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
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struct wm8350 *wm8350 = wm8350_gpio->wm8350;
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int ret;
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ret = wm8350_reg_read(wm8350, WM8350_GPIO_LEVEL);
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if (ret < 0)
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return ret;
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if (ret & (1 << offset))
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return 1;
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else
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return 0;
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}
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static void wm8350_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
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{
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struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
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struct wm8350 *wm8350 = wm8350_gpio->wm8350;
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if (value)
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wm8350_set_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset);
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else
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wm8350_clear_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset);
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}
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static int wm8350_gpio_direction_out(struct gpio_chip *chip,
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unsigned offset, int value)
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{
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struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
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struct wm8350 *wm8350 = wm8350_gpio->wm8350;
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int ret;
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ret = wm8350_clear_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O,
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1 << offset);
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if (ret < 0)
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return ret;
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/* Don't have an atomic direction/value setup */
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wm8350_gpio_set(chip, offset, value);
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return 0;
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}
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static int wm8350_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
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{
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struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
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struct wm8350 *wm8350 = wm8350_gpio->wm8350;
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if (!wm8350->irq_base)
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return -EINVAL;
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return wm8350->irq_base + WM8350_IRQ_GPIO(offset);
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}
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static const struct gpio_chip template_chip = {
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.label = "wm8350",
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.owner = THIS_MODULE,
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.direction_input = wm8350_gpio_direction_in,
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.get = wm8350_gpio_get,
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.direction_output = wm8350_gpio_direction_out,
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.set = wm8350_gpio_set,
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.to_irq = wm8350_gpio_to_irq,
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.can_sleep = true,
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};
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static int wm8350_gpio_probe(struct platform_device *pdev)
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{
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struct wm8350 *wm8350 = dev_get_drvdata(pdev->dev.parent);
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struct wm8350_platform_data *pdata = dev_get_platdata(wm8350->dev);
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struct wm8350_gpio_data *wm8350_gpio;
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int ret;
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wm8350_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8350_gpio),
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GFP_KERNEL);
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if (wm8350_gpio == NULL)
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return -ENOMEM;
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wm8350_gpio->wm8350 = wm8350;
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wm8350_gpio->gpio_chip = template_chip;
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wm8350_gpio->gpio_chip.ngpio = 13;
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wm8350_gpio->gpio_chip.parent = &pdev->dev;
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if (pdata && pdata->gpio_base)
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wm8350_gpio->gpio_chip.base = pdata->gpio_base;
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else
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wm8350_gpio->gpio_chip.base = -1;
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ret = devm_gpiochip_add_data(&pdev->dev, &wm8350_gpio->gpio_chip,
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wm8350_gpio);
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if (ret < 0) {
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dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
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return ret;
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}
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platform_set_drvdata(pdev, wm8350_gpio);
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return ret;
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}
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static struct platform_driver wm8350_gpio_driver = {
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.driver.name = "wm8350-gpio",
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.probe = wm8350_gpio_probe,
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};
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static int __init wm8350_gpio_init(void)
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{
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return platform_driver_register(&wm8350_gpio_driver);
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}
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subsys_initcall(wm8350_gpio_init);
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static void __exit wm8350_gpio_exit(void)
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{
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platform_driver_unregister(&wm8350_gpio_driver);
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}
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module_exit(wm8350_gpio_exit);
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MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
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MODULE_DESCRIPTION("GPIO interface for WM8350 PMICs");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:wm8350-gpio");
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