// SPDX-License-Identifier: GPL-2.0-only /* * Copyright Intel Corporation (C) 2014-2016. All Rights Reserved * * 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 -EINVAL; return 0; } 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 -EINVAL; altr_a10sr_gpio_set(gc, nr, value); return 0; } 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");