diff options
Diffstat (limited to 'drivers/gpio/gpio-altera-a10sr.c')
| -rw-r--r-- | drivers/gpio/gpio-altera-a10sr.c | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-altera-a10sr.c b/drivers/gpio/gpio-altera-a10sr.c new file mode 100644 index 000000000000..8274f98e3bee --- /dev/null +++ b/drivers/gpio/gpio-altera-a10sr.c @@ -0,0 +1,140 @@ +/* + * 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"); |