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 14 /** 15 * struct altr_a10sr_gpio - Altera Max5 GPIO device private data structure 16 * @gp: : instance of the gpio_chip 17 * @regmap: the regmap from the parent device. 18 */ 19 struct altr_a10sr_gpio { 20 struct gpio_chip gp; 21 struct regmap *regmap; 22 }; 23 24 static int altr_a10sr_gpio_get(struct gpio_chip *chip, unsigned int offset) 25 { 26 struct altr_a10sr_gpio *gpio = gpiochip_get_data(chip); 27 int ret, val; 28 29 ret = regmap_read(gpio->regmap, ALTR_A10SR_PBDSW_REG, &val); 30 if (ret < 0) 31 return ret; 32 33 return !!(val & BIT(offset - ALTR_A10SR_LED_VALID_SHIFT)); 34 } 35 36 static void altr_a10sr_gpio_set(struct gpio_chip *chip, unsigned int offset, 37 int value) 38 { 39 struct altr_a10sr_gpio *gpio = gpiochip_get_data(chip); 40 41 regmap_update_bits(gpio->regmap, ALTR_A10SR_LED_REG, 42 BIT(ALTR_A10SR_LED_VALID_SHIFT + offset), 43 value ? BIT(ALTR_A10SR_LED_VALID_SHIFT + offset) 44 : 0); 45 } 46 47 static int altr_a10sr_gpio_direction_input(struct gpio_chip *gc, 48 unsigned int nr) 49 { 50 if (nr < (ALTR_A10SR_IN_VALID_RANGE_LO - ALTR_A10SR_LED_VALID_SHIFT)) 51 return -EINVAL; 52 53 return 0; 54 } 55 56 static int altr_a10sr_gpio_direction_output(struct gpio_chip *gc, 57 unsigned int nr, int value) 58 { 59 if (nr > (ALTR_A10SR_OUT_VALID_RANGE_HI - ALTR_A10SR_LED_VALID_SHIFT)) 60 return -EINVAL; 61 62 altr_a10sr_gpio_set(gc, nr, value); 63 return 0; 64 } 65 66 static const struct gpio_chip altr_a10sr_gc = { 67 .label = "altr_a10sr_gpio", 68 .owner = THIS_MODULE, 69 .get = altr_a10sr_gpio_get, 70 .set = altr_a10sr_gpio_set, 71 .direction_input = altr_a10sr_gpio_direction_input, 72 .direction_output = altr_a10sr_gpio_direction_output, 73 .can_sleep = true, 74 .ngpio = 12, 75 .base = -1, 76 }; 77 78 static int altr_a10sr_gpio_probe(struct platform_device *pdev) 79 { 80 struct altr_a10sr_gpio *gpio; 81 int ret; 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.of_node = pdev->dev.of_node; 93 94 ret = devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio); 95 if (ret < 0) { 96 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret); 97 return ret; 98 } 99 100 platform_set_drvdata(pdev, gpio); 101 102 return 0; 103 } 104 105 static const struct of_device_id altr_a10sr_gpio_of_match[] = { 106 { .compatible = "altr,a10sr-gpio" }, 107 { }, 108 }; 109 MODULE_DEVICE_TABLE(of, altr_a10sr_gpio_of_match); 110 111 static struct platform_driver altr_a10sr_gpio_driver = { 112 .probe = altr_a10sr_gpio_probe, 113 .driver = { 114 .name = "altr_a10sr_gpio", 115 .of_match_table = of_match_ptr(altr_a10sr_gpio_of_match), 116 }, 117 }; 118 module_platform_driver(altr_a10sr_gpio_driver); 119 120 MODULE_LICENSE("GPL v2"); 121 MODULE_AUTHOR("Thor Thayer <tthayer@opensource.altera.com>"); 122 MODULE_DESCRIPTION("Altera Arria10 System Resource Chip GPIO"); 123