| /* |
| * 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 const 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.parent = pdev->dev.parent; |
| 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 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, |
| .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"); |