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https://github.com/torvalds/linux
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21dde316ca
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>
131 lines
3.3 KiB
C
131 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* ROHM BD9571MWV-M and BD9574MWF-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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* 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/mfd/rohm-generic.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 regmap *regmap;
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struct gpio_chip chip;
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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->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->regmap, BD9571MWV_GPIO_DIR, 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->regmap, BD9571MWV_GPIO_OUT,
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BIT(offset), value ? BIT(offset) : 0);
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regmap_update_bits(gpio->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->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->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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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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gpio->regmap = dev_get_regmap(pdev->dev.parent, NULL);
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gpio->chip = template_chip;
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gpio->chip.parent = pdev->dev.parent;
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return devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
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}
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static const struct platform_device_id bd9571mwv_gpio_id_table[] = {
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{ "bd9571mwv-gpio", ROHM_CHIP_TYPE_BD9571 },
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{ "bd9574mwf-gpio", ROHM_CHIP_TYPE_BD9574 },
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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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