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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright Intel Corporation (C) 2014-2016. All Rights Reserved4 *5 * GPIO driver for Altera Arria10 MAX5 System Resource Chip6 *7 * Adapted from gpio-tps65910.c8 */9 10#include <linux/gpio/driver.h>11#include <linux/mfd/altera-a10sr.h>12#include <linux/mod_devicetable.h>13#include <linux/module.h>14#include <linux/property.h>15 16/**17 * struct altr_a10sr_gpio - Altera Max5 GPIO device private data structure18 * @gp: : instance of the gpio_chip19 * @regmap: the regmap from the parent device.20 */21struct altr_a10sr_gpio {22 struct gpio_chip gp;23 struct regmap *regmap;24};25 26static int altr_a10sr_gpio_get(struct gpio_chip *chip, unsigned int offset)27{28 struct altr_a10sr_gpio *gpio = gpiochip_get_data(chip);29 int ret, val;30 31 ret = regmap_read(gpio->regmap, ALTR_A10SR_PBDSW_REG, &val);32 if (ret < 0)33 return ret;34 35 return !!(val & BIT(offset - ALTR_A10SR_LED_VALID_SHIFT));36}37 38static void altr_a10sr_gpio_set(struct gpio_chip *chip, unsigned int offset,39 int value)40{41 struct altr_a10sr_gpio *gpio = gpiochip_get_data(chip);42 43 regmap_update_bits(gpio->regmap, ALTR_A10SR_LED_REG,44 BIT(ALTR_A10SR_LED_VALID_SHIFT + offset),45 value ? BIT(ALTR_A10SR_LED_VALID_SHIFT + offset)46 : 0);47}48 49static int altr_a10sr_gpio_direction_input(struct gpio_chip *gc,50 unsigned int nr)51{52 if (nr < (ALTR_A10SR_IN_VALID_RANGE_LO - ALTR_A10SR_LED_VALID_SHIFT))53 return -EINVAL;54 55 return 0;56}57 58static int altr_a10sr_gpio_direction_output(struct gpio_chip *gc,59 unsigned int nr, int value)60{61 if (nr > (ALTR_A10SR_OUT_VALID_RANGE_HI - ALTR_A10SR_LED_VALID_SHIFT))62 return -EINVAL;63 64 altr_a10sr_gpio_set(gc, nr, value);65 return 0;66}67 68static const struct gpio_chip altr_a10sr_gc = {69 .label = "altr_a10sr_gpio",70 .owner = THIS_MODULE,71 .get = altr_a10sr_gpio_get,72 .set = altr_a10sr_gpio_set,73 .direction_input = altr_a10sr_gpio_direction_input,74 .direction_output = altr_a10sr_gpio_direction_output,75 .can_sleep = true,76 .ngpio = 12,77 .base = -1,78};79 80static int altr_a10sr_gpio_probe(struct platform_device *pdev)81{82 struct altr_a10sr_gpio *gpio;83 struct altr_a10sr *a10sr = dev_get_drvdata(pdev->dev.parent);84 85 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);86 if (!gpio)87 return -ENOMEM;88 89 gpio->regmap = a10sr->regmap;90 91 gpio->gp = altr_a10sr_gc;92 gpio->gp.parent = pdev->dev.parent;93 gpio->gp.fwnode = dev_fwnode(&pdev->dev);94 95 return devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio);96}97 98static const struct of_device_id altr_a10sr_gpio_of_match[] = {99 { .compatible = "altr,a10sr-gpio" },100 { },101};102MODULE_DEVICE_TABLE(of, altr_a10sr_gpio_of_match);103 104static struct platform_driver altr_a10sr_gpio_driver = {105 .probe = altr_a10sr_gpio_probe,106 .driver = {107 .name = "altr_a10sr_gpio",108 .of_match_table = altr_a10sr_gpio_of_match,109 },110};111module_platform_driver(altr_a10sr_gpio_driver);112 113MODULE_LICENSE("GPL v2");114MODULE_AUTHOR("Thor Thayer <tthayer@opensource.altera.com>");115MODULE_DESCRIPTION("Altera Arria10 System Resource Chip GPIO");116