1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright Intel Corporation (C) 2014-2016. All Rights Reserved 4 * 5 * GPIO driver for Altera Arria10 MAX5 System Resource Chip 6 * 7 * Adapted from gpio-tps65910.c 8 */ 9 10 #include <linux/gpio/driver.h> 11 #include <linux/mfd/altera-a10sr.h> 12 #include <linux/module.h> 13 #include <linux/property.h> 14 15 /** 16 * struct altr_a10sr_gpio - Altera Max5 GPIO device private data structure 17 * @gp: : instance of the gpio_chip 18 * @regmap: the regmap from the parent device. 19 */ 20 struct altr_a10sr_gpio { 21 struct gpio_chip gp; 22 struct regmap *regmap; 23 }; 24 25 static int altr_a10sr_gpio_get(struct gpio_chip *chip, unsigned int offset) 26 { 27 struct altr_a10sr_gpio *gpio = gpiochip_get_data(chip); 28 int ret, val; 29 30 ret = regmap_read(gpio->regmap, ALTR_A10SR_PBDSW_REG, &val); 31 if (ret < 0) 32 return ret; 33 34 return !!(val & BIT(offset - ALTR_A10SR_LED_VALID_SHIFT)); 35 } 36 37 static void altr_a10sr_gpio_set(struct gpio_chip *chip, unsigned int offset, 38 int value) 39 { 40 struct altr_a10sr_gpio *gpio = gpiochip_get_data(chip); 41 42 regmap_update_bits(gpio->regmap, ALTR_A10SR_LED_REG, 43 BIT(ALTR_A10SR_LED_VALID_SHIFT + offset), 44 value ? BIT(ALTR_A10SR_LED_VALID_SHIFT + offset) 45 : 0); 46 } 47 48 static int altr_a10sr_gpio_direction_input(struct gpio_chip *gc, 49 unsigned int nr) 50 { 51 if (nr < (ALTR_A10SR_IN_VALID_RANGE_LO - ALTR_A10SR_LED_VALID_SHIFT)) 52 return -EINVAL; 53 54 return 0; 55 } 56 57 static int altr_a10sr_gpio_direction_output(struct gpio_chip *gc, 58 unsigned int nr, int value) 59 { 60 if (nr > (ALTR_A10SR_OUT_VALID_RANGE_HI - ALTR_A10SR_LED_VALID_SHIFT)) 61 return -EINVAL; 62 63 altr_a10sr_gpio_set(gc, nr, value); 64 return 0; 65 } 66 67 static const struct gpio_chip altr_a10sr_gc = { 68 .label = "altr_a10sr_gpio", 69 .owner = THIS_MODULE, 70 .get = altr_a10sr_gpio_get, 71 .set = altr_a10sr_gpio_set, 72 .direction_input = altr_a10sr_gpio_direction_input, 73 .direction_output = altr_a10sr_gpio_direction_output, 74 .can_sleep = true, 75 .ngpio = 12, 76 .base = -1, 77 }; 78 79 static int altr_a10sr_gpio_probe(struct platform_device *pdev) 80 { 81 struct altr_a10sr_gpio *gpio; 82 struct altr_a10sr *a10sr = dev_get_drvdata(pdev->dev.parent); 83 84 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); 85 if (!gpio) 86 return -ENOMEM; 87 88 gpio->regmap = a10sr->regmap; 89 90 gpio->gp = altr_a10sr_gc; 91 gpio->gp.parent = pdev->dev.parent; 92 gpio->gp.fwnode = dev_fwnode(&pdev->dev); 93 94 return devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio); 95 } 96 97 static const struct of_device_id altr_a10sr_gpio_of_match[] = { 98 { .compatible = "altr,a10sr-gpio" }, 99 { }, 100 }; 101 MODULE_DEVICE_TABLE(of, altr_a10sr_gpio_of_match); 102 103 static struct platform_driver altr_a10sr_gpio_driver = { 104 .probe = altr_a10sr_gpio_probe, 105 .driver = { 106 .name = "altr_a10sr_gpio", 107 .of_match_table = of_match_ptr(altr_a10sr_gpio_of_match), 108 }, 109 }; 110 module_platform_driver(altr_a10sr_gpio_driver); 111 112 MODULE_LICENSE("GPL v2"); 113 MODULE_AUTHOR("Thor Thayer <tthayer@opensource.altera.com>"); 114 MODULE_DESCRIPTION("Altera Arria10 System Resource Chip GPIO"); 115