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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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aa93b0f39a
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>
113 lines
2.9 KiB
C
113 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright Intel Corporation (C) 2014-2016. All Rights Reserved
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*
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* GPIO driver for Altera Arria10 MAX5 System Resource Chip
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*
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* Adapted from gpio-tps65910.c
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*/
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#include <linux/gpio/driver.h>
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#include <linux/mfd/altera-a10sr.h>
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#include <linux/module.h>
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/**
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* struct altr_a10sr_gpio - Altera Max5 GPIO device private data structure
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* @gp: : instance of the gpio_chip
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* @regmap: the regmap from the parent device.
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*/
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struct altr_a10sr_gpio {
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struct gpio_chip gp;
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struct regmap *regmap;
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};
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static int altr_a10sr_gpio_get(struct gpio_chip *chip, unsigned int offset)
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{
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struct altr_a10sr_gpio *gpio = gpiochip_get_data(chip);
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int ret, val;
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ret = regmap_read(gpio->regmap, ALTR_A10SR_PBDSW_REG, &val);
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if (ret < 0)
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return ret;
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return !!(val & BIT(offset - ALTR_A10SR_LED_VALID_SHIFT));
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}
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static void altr_a10sr_gpio_set(struct gpio_chip *chip, unsigned int offset,
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int value)
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{
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struct altr_a10sr_gpio *gpio = gpiochip_get_data(chip);
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regmap_update_bits(gpio->regmap, ALTR_A10SR_LED_REG,
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BIT(ALTR_A10SR_LED_VALID_SHIFT + offset),
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value ? BIT(ALTR_A10SR_LED_VALID_SHIFT + offset)
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: 0);
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}
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static int altr_a10sr_gpio_direction_input(struct gpio_chip *gc,
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unsigned int nr)
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{
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if (nr < (ALTR_A10SR_IN_VALID_RANGE_LO - ALTR_A10SR_LED_VALID_SHIFT))
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return -EINVAL;
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return 0;
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}
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static int altr_a10sr_gpio_direction_output(struct gpio_chip *gc,
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unsigned int nr, int value)
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{
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if (nr > (ALTR_A10SR_OUT_VALID_RANGE_HI - ALTR_A10SR_LED_VALID_SHIFT))
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return -EINVAL;
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altr_a10sr_gpio_set(gc, nr, value);
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return 0;
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}
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static const struct gpio_chip altr_a10sr_gc = {
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.label = "altr_a10sr_gpio",
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.owner = THIS_MODULE,
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.get = altr_a10sr_gpio_get,
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.set = altr_a10sr_gpio_set,
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.direction_input = altr_a10sr_gpio_direction_input,
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.direction_output = altr_a10sr_gpio_direction_output,
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.can_sleep = true,
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.ngpio = 12,
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.base = -1,
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};
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static int altr_a10sr_gpio_probe(struct platform_device *pdev)
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{
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struct altr_a10sr_gpio *gpio;
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struct altr_a10sr *a10sr = dev_get_drvdata(pdev->dev.parent);
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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 = a10sr->regmap;
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gpio->gp = altr_a10sr_gc;
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gpio->gp.parent = pdev->dev.parent;
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gpio->gp.of_node = pdev->dev.of_node;
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return devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio);
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}
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static const struct of_device_id altr_a10sr_gpio_of_match[] = {
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{ .compatible = "altr,a10sr-gpio" },
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{ },
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};
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MODULE_DEVICE_TABLE(of, altr_a10sr_gpio_of_match);
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static struct platform_driver altr_a10sr_gpio_driver = {
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.probe = altr_a10sr_gpio_probe,
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.driver = {
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.name = "altr_a10sr_gpio",
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.of_match_table = of_match_ptr(altr_a10sr_gpio_of_match),
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},
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};
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module_platform_driver(altr_a10sr_gpio_driver);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Thor Thayer <tthayer@opensource.altera.com>");
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MODULE_DESCRIPTION("Altera Arria10 System Resource Chip GPIO");
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