9952f6918d
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 228 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Steve Winslow <swinslow@gmail.com> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190528171438.107155473@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
123 lines
3 KiB
C
123 lines
3 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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int ret;
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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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ret = devm_gpiochip_add_data(&pdev->dev, &gpio->gp, 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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platform_set_drvdata(pdev, gpio);
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return 0;
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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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