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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>
147 lines
3.7 KiB
C
147 lines
3.7 KiB
C
/*
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* ROHM BD9571MWV-M GPIO driver
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*
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* Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@gmail.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether expressed or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License version 2 for more details.
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*
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* Based on the TPS65086 driver
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*
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* NOTE: Interrupts are not supported yet.
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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/bd9571mwv.h>
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struct bd9571mwv_gpio {
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struct gpio_chip chip;
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struct bd9571mwv *bd;
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};
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static int bd9571mwv_gpio_get_direction(struct gpio_chip *chip,
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unsigned int offset)
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{
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struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
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int ret, val;
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ret = regmap_read(gpio->bd->regmap, BD9571MWV_GPIO_DIR, &val);
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if (ret < 0)
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return ret;
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if (val & BIT(offset))
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return GPIO_LINE_DIRECTION_IN;
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return GPIO_LINE_DIRECTION_OUT;
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}
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static int bd9571mwv_gpio_direction_input(struct gpio_chip *chip,
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unsigned int offset)
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{
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struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
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regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_DIR,
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BIT(offset), 0);
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return 0;
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}
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static int bd9571mwv_gpio_direction_output(struct gpio_chip *chip,
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unsigned int offset, int value)
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{
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struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
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/* Set the initial value */
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regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_OUT,
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BIT(offset), value ? BIT(offset) : 0);
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regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_DIR,
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BIT(offset), BIT(offset));
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return 0;
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}
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static int bd9571mwv_gpio_get(struct gpio_chip *chip, unsigned int offset)
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{
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struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
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int ret, val;
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ret = regmap_read(gpio->bd->regmap, BD9571MWV_GPIO_IN, &val);
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if (ret < 0)
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return ret;
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return val & BIT(offset);
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}
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static void bd9571mwv_gpio_set(struct gpio_chip *chip, unsigned int offset,
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int value)
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{
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struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
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regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_OUT,
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BIT(offset), value ? BIT(offset) : 0);
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}
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static const struct gpio_chip template_chip = {
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.label = "bd9571mwv-gpio",
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.owner = THIS_MODULE,
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.get_direction = bd9571mwv_gpio_get_direction,
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.direction_input = bd9571mwv_gpio_direction_input,
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.direction_output = bd9571mwv_gpio_direction_output,
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.get = bd9571mwv_gpio_get,
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.set = bd9571mwv_gpio_set,
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.base = -1,
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.ngpio = 2,
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.can_sleep = true,
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};
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static int bd9571mwv_gpio_probe(struct platform_device *pdev)
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{
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struct bd9571mwv_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->bd = dev_get_drvdata(pdev->dev.parent);
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gpio->chip = template_chip;
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gpio->chip.parent = gpio->bd->dev;
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ret = devm_gpiochip_add_data(&pdev->dev, &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 const struct platform_device_id bd9571mwv_gpio_id_table[] = {
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{ "bd9571mwv-gpio", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(platform, bd9571mwv_gpio_id_table);
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static struct platform_driver bd9571mwv_gpio_driver = {
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.driver = {
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.name = "bd9571mwv-gpio",
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},
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.probe = bd9571mwv_gpio_probe,
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.id_table = bd9571mwv_gpio_id_table,
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};
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module_platform_driver(bd9571mwv_gpio_driver);
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MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@gmail.com>");
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MODULE_DESCRIPTION("BD9571MWV GPIO driver");
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MODULE_LICENSE("GPL v2");
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