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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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e42615ec23
It's hard for occasional GPIO code reader/writer to know if values 0/1 equal to IN or OUT. Use defined GPIO_LINE_DIRECTION_IN and GPIO_LINE_DIRECTION_OUT to help them out. NOTE - for gpio-amd-fch and gpio-bd9571mwv: This commit also changes the return value for direction get to equal 1 for direction INPUT. Prior this commit these drivers might have returned some other positive value but 1 for INPUT. Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com> Acked-by: Scott Branden <scott.branden@broadcom.com> Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com> Reviewed-by: Michal Simek <michal.simek@xilinx.com> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: William Breathitt Gray <vilhelm.gray@gmail.com> Acked-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
131 lines
3 KiB
C
131 lines
3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
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* Andrew F. Davis <afd@ti.com>
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*
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* Based on the TPS65912 driver
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*/
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#include <linux/gpio/driver.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/tps65086.h>
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struct tps65086_gpio {
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struct gpio_chip chip;
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struct tps65086 *tps;
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};
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static int tps65086_gpio_get_direction(struct gpio_chip *chip,
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unsigned offset)
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{
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/* This device is output only */
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return GPIO_LINE_DIRECTION_OUT;
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}
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static int tps65086_gpio_direction_input(struct gpio_chip *chip,
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unsigned offset)
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{
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/* This device is output only */
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return -EINVAL;
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}
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static int tps65086_gpio_direction_output(struct gpio_chip *chip,
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unsigned offset, int value)
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{
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struct tps65086_gpio *gpio = gpiochip_get_data(chip);
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/* Set the initial value */
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regmap_update_bits(gpio->tps->regmap, TPS65086_GPOCTRL,
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BIT(4 + offset), value ? BIT(4 + offset) : 0);
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return 0;
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}
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static int tps65086_gpio_get(struct gpio_chip *chip, unsigned offset)
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{
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struct tps65086_gpio *gpio = gpiochip_get_data(chip);
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int ret, val;
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ret = regmap_read(gpio->tps->regmap, TPS65086_GPOCTRL, &val);
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if (ret < 0)
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return ret;
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return val & BIT(4 + offset);
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}
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static void tps65086_gpio_set(struct gpio_chip *chip, unsigned offset,
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int value)
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{
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struct tps65086_gpio *gpio = gpiochip_get_data(chip);
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regmap_update_bits(gpio->tps->regmap, TPS65086_GPOCTRL,
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BIT(4 + offset), value ? BIT(4 + offset) : 0);
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}
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static const struct gpio_chip template_chip = {
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.label = "tps65086-gpio",
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.owner = THIS_MODULE,
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.get_direction = tps65086_gpio_get_direction,
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.direction_input = tps65086_gpio_direction_input,
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.direction_output = tps65086_gpio_direction_output,
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.get = tps65086_gpio_get,
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.set = tps65086_gpio_set,
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.base = -1,
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.ngpio = 4,
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.can_sleep = true,
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};
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static int tps65086_gpio_probe(struct platform_device *pdev)
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{
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struct tps65086_gpio *gpio;
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int ret;
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gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
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if (!gpio)
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return -ENOMEM;
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platform_set_drvdata(pdev, gpio);
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gpio->tps = dev_get_drvdata(pdev->dev.parent);
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gpio->chip = template_chip;
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gpio->chip.parent = gpio->tps->dev;
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ret = gpiochip_add_data(&gpio->chip, 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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return 0;
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}
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static int tps65086_gpio_remove(struct platform_device *pdev)
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{
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struct tps65086_gpio *gpio = platform_get_drvdata(pdev);
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gpiochip_remove(&gpio->chip);
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return 0;
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}
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static const struct platform_device_id tps65086_gpio_id_table[] = {
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{ "tps65086-gpio", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(platform, tps65086_gpio_id_table);
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static struct platform_driver tps65086_gpio_driver = {
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.driver = {
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.name = "tps65086-gpio",
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},
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.probe = tps65086_gpio_probe,
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.remove = tps65086_gpio_remove,
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.id_table = tps65086_gpio_id_table,
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};
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module_platform_driver(tps65086_gpio_driver);
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MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
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MODULE_DESCRIPTION("TPS65086 GPIO driver");
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MODULE_LICENSE("GPL v2");
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