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0533260687
The platform_set_drvdata() call is only useful if we need to retrieve back the private information. Since the driver doesn't do that, it's not useful to have it. If this is removed, we can also just do a direct return on devm_gpiochip_add_data(). We don't need to print that this call failed as there are other ways to log/see this during probe. Signed-off-by: Alexandru Ardelean <aardelean@deviqon.com> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
146 lines
3.7 KiB
C
146 lines
3.7 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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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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return devm_gpiochip_add_data(&pdev->dev, &wm8350_gpio->gpio_chip, wm8350_gpio);
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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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