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68b7587baa
Change the coding style to make it does error checking first. This also fixes checkpatch warning about line over 80 characters. Signed-off-by: Axel Lin <axel.lin@ingics.com> Tested by: Thor Thayer <thor.thayer@linux.intel.com> Reviewed by: Thor Thayer <thor.thayer@linux.intel.com> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
134 lines
3.6 KiB
C
134 lines
3.6 KiB
C
/*
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* Copyright Intel Corporation (C) 2014-2016. All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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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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