gpio: altera-a10sr: Add A10 System Resource Chip GPIO support. (26a48c4c) · Commits · 戴 / test

drivers/gpio/Kconfig

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		@@ -818,6 +818,14 @@ config GPIO_ADP5520
		This option enables support for on-chip GPIO found
		on Analog Devices ADP5520 PMICs.

		config GPIO_ALTERA_A10SR
		tristate "Altera Arria10 System Resource GPIO"
		depends on MFD_ALTERA_A10SR
		help
		Driver for Arria10 Development Kit GPIO expansion which
		includes reads of pushbuttons and DIP switches as well
		as writes to LEDs.

		config GPIO_ARIZONA
		tristate "Wolfson Microelectronics Arizona class devices"
		depends on MFD_ARIZONA

drivers/gpio/Makefile

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		@@ -24,6 +24,7 @@ obj-$(CONFIG_GPIO_ADNP) += gpio-adnp.o
		obj-$(CONFIG_GPIO_ADP5520) += gpio-adp5520.o
		obj-$(CONFIG_GPIO_ADP5588) += gpio-adp5588.o
		obj-$(CONFIG_GPIO_ALTERA) += gpio-altera.o
		obj-$(CONFIG_GPIO_ALTERA_A10SR) += gpio-altera-a10sr.o
		obj-$(CONFIG_GPIO_AMD8111) += gpio-amd8111.o
		obj-$(CONFIG_GPIO_AMDPT) += gpio-amdpt.o
		obj-$(CONFIG_GPIO_ARIZONA) += gpio-arizona.o

drivers/gpio/gpio-altera-a10sr.c

0 → 100644

+140 −0

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		/*
		* Copyright Intel Corporation (C) 2014-2016. All Rights Reserved
		*
		* This program is free software; you can redistribute it and/or modify it
		* under the terms and conditions of the GNU General Public License,
		* version 2, as published by the Free Software Foundation.
		*
		* This program is distributed in the hope it will be useful, but WITHOUT
		* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
		* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
		* more details.
		*
		* You should have received a copy of the GNU General Public License along with
		* this program. If not, see <http://www.gnu.org/licenses/>.
		*
		* GPIO driver for Altera Arria10 MAX5 System Resource Chip
		*
		* Adapted from gpio-tps65910.c
		*/

		#include <linux/gpio/driver.h>
		#include <linux/mfd/altera-a10sr.h>
		#include <linux/module.h>

		/**
		* struct altr_a10sr_gpio - Altera Max5 GPIO device private data structure
		* @gp: : instance of the gpio_chip
		* @regmap: the regmap from the parent device.
		*/
		struct altr_a10sr_gpio {
		struct gpio_chip gp;
		struct regmap *regmap;
		};

		static int altr_a10sr_gpio_get(struct gpio_chip *chip, unsigned int offset)
		{
		struct altr_a10sr_gpio *gpio = gpiochip_get_data(chip);
		int ret, val;

		ret = regmap_read(gpio->regmap, ALTR_A10SR_PBDSW_REG, &val);
		if (ret < 0)
		return ret;

		return !!(val & BIT(offset - ALTR_A10SR_LED_VALID_SHIFT));
		}

		static void altr_a10sr_gpio_set(struct gpio_chip *chip, unsigned int offset,
		int value)
		{
		struct altr_a10sr_gpio *gpio = gpiochip_get_data(chip);

		regmap_update_bits(gpio->regmap, ALTR_A10SR_LED_REG,
		BIT(ALTR_A10SR_LED_VALID_SHIFT + offset),
		value ? BIT(ALTR_A10SR_LED_VALID_SHIFT + offset)
		: 0);
		}

		static int altr_a10sr_gpio_direction_input(struct gpio_chip *gc,
		unsigned int nr)
		{
		if (nr >= (ALTR_A10SR_IN_VALID_RANGE_LO - ALTR_A10SR_LED_VALID_SHIFT))
		return 0;
		return -EINVAL;
		}

		static int altr_a10sr_gpio_direction_output(struct gpio_chip *gc,
		unsigned int nr, int value)
		{
		if (nr <= (ALTR_A10SR_OUT_VALID_RANGE_HI - ALTR_A10SR_LED_VALID_SHIFT))
		return 0;
		return -EINVAL;
		}

		static struct gpio_chip altr_a10sr_gc = {
		.label = "altr_a10sr_gpio",
		.owner = THIS_MODULE,
		.get = altr_a10sr_gpio_get,
		.set = altr_a10sr_gpio_set,
		.direction_input = altr_a10sr_gpio_direction_input,
		.direction_output = altr_a10sr_gpio_direction_output,
		.can_sleep = true,
		.ngpio = 12,
		.base = -1,
		};

		static int altr_a10sr_gpio_probe(struct platform_device *pdev)
		{
		struct altr_a10sr_gpio *gpio;
		int ret;
		struct altr_a10sr *a10sr = dev_get_drvdata(pdev->dev.parent);

		gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
		if (!gpio)
		return -ENOMEM;

		gpio->regmap = a10sr->regmap;

		gpio->gp = altr_a10sr_gc;

		gpio->gp.of_node = pdev->dev.of_node;

		ret = devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio);
		if (ret < 0) {
		dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
		return ret;
		}

		platform_set_drvdata(pdev, gpio);

		return 0;
		}

		static int altr_a10sr_gpio_remove(struct platform_device *pdev)
		{
		struct altr_a10sr_gpio *gpio = platform_get_drvdata(pdev);

		gpiochip_remove(&gpio->gp);

		return 0;
		}

		static const struct of_device_id altr_a10sr_gpio_of_match[] = {
		{ .compatible = "altr,a10sr-gpio" },
		{ },
		};
		MODULE_DEVICE_TABLE(of, altr_a10sr_gpio_of_match);

		static struct platform_driver altr_a10sr_gpio_driver = {
		.probe = altr_a10sr_gpio_probe,
		.remove = altr_a10sr_gpio_remove,
		.driver = {
		.name = "altr_a10sr_gpio",
		.of_match_table = of_match_ptr(altr_a10sr_gpio_of_match),
		},
		};
		module_platform_driver(altr_a10sr_gpio_driver);

		MODULE_LICENSE("GPL v2");
		MODULE_AUTHOR("Thor Thayer <tthayer@opensource.altera.com>");
		MODULE_DESCRIPTION("Altera Arria10 System Resource Chip GPIO");

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