1 // SPDX-License-Identifier: GPL-2.0 2 // Copyright (c) 2019, Linaro Limited 3 4 #include <linux/mod_devicetable.h> 5 #include <linux/module.h> 6 #include <linux/gpio/driver.h> 7 #include <linux/platform_device.h> 8 #include <linux/regmap.h> 9 #include <linux/slab.h> 10 11 #define WCD_PIN_MASK(p) BIT(p) 12 #define WCD_REG_DIR_CTL_OFFSET 0x42 13 #define WCD_REG_VAL_CTL_OFFSET 0x43 14 #define WCD934X_NPINS 5 15 16 struct wcd_gpio_data { 17 struct regmap *map; 18 struct gpio_chip chip; 19 }; 20 21 static int wcd_gpio_get_direction(struct gpio_chip *chip, unsigned int pin) 22 { 23 struct wcd_gpio_data *data = gpiochip_get_data(chip); 24 unsigned int value; 25 int ret; 26 27 ret = regmap_read(data->map, WCD_REG_DIR_CTL_OFFSET, &value); 28 if (ret < 0) 29 return ret; 30 31 if (value & WCD_PIN_MASK(pin)) 32 return GPIO_LINE_DIRECTION_OUT; 33 34 return GPIO_LINE_DIRECTION_IN; 35 } 36 37 static int wcd_gpio_direction_input(struct gpio_chip *chip, unsigned int pin) 38 { 39 struct wcd_gpio_data *data = gpiochip_get_data(chip); 40 41 return regmap_update_bits(data->map, WCD_REG_DIR_CTL_OFFSET, 42 WCD_PIN_MASK(pin), 0); 43 } 44 45 static int wcd_gpio_direction_output(struct gpio_chip *chip, unsigned int pin, 46 int val) 47 { 48 struct wcd_gpio_data *data = gpiochip_get_data(chip); 49 50 regmap_update_bits(data->map, WCD_REG_DIR_CTL_OFFSET, 51 WCD_PIN_MASK(pin), WCD_PIN_MASK(pin)); 52 53 return regmap_update_bits(data->map, WCD_REG_VAL_CTL_OFFSET, 54 WCD_PIN_MASK(pin), 55 val ? WCD_PIN_MASK(pin) : 0); 56 } 57 58 static int wcd_gpio_get(struct gpio_chip *chip, unsigned int pin) 59 { 60 struct wcd_gpio_data *data = gpiochip_get_data(chip); 61 unsigned int value; 62 63 regmap_read(data->map, WCD_REG_VAL_CTL_OFFSET, &value); 64 65 return !!(value & WCD_PIN_MASK(pin)); 66 } 67 68 static void wcd_gpio_set(struct gpio_chip *chip, unsigned int pin, int val) 69 { 70 struct wcd_gpio_data *data = gpiochip_get_data(chip); 71 72 regmap_update_bits(data->map, WCD_REG_VAL_CTL_OFFSET, 73 WCD_PIN_MASK(pin), val ? WCD_PIN_MASK(pin) : 0); 74 } 75 76 static int wcd_gpio_probe(struct platform_device *pdev) 77 { 78 struct device *dev = &pdev->dev; 79 struct wcd_gpio_data *data; 80 struct gpio_chip *chip; 81 82 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); 83 if (!data) 84 return -ENOMEM; 85 86 data->map = dev_get_regmap(dev->parent, NULL); 87 if (!data->map) { 88 dev_err(dev, "%s: failed to get regmap\n", __func__); 89 return -EINVAL; 90 } 91 92 chip = &data->chip; 93 chip->direction_input = wcd_gpio_direction_input; 94 chip->direction_output = wcd_gpio_direction_output; 95 chip->get_direction = wcd_gpio_get_direction; 96 chip->get = wcd_gpio_get; 97 chip->set = wcd_gpio_set; 98 chip->parent = dev; 99 chip->base = -1; 100 chip->ngpio = WCD934X_NPINS; 101 chip->label = dev_name(dev); 102 chip->can_sleep = false; 103 104 return devm_gpiochip_add_data(dev, chip, data); 105 } 106 107 static const struct of_device_id wcd_gpio_of_match[] = { 108 { .compatible = "qcom,wcd9340-gpio" }, 109 { .compatible = "qcom,wcd9341-gpio" }, 110 { } 111 }; 112 MODULE_DEVICE_TABLE(of, wcd_gpio_of_match); 113 114 static struct platform_driver wcd_gpio_driver = { 115 .driver = { 116 .name = "wcd934x-gpio", 117 .of_match_table = wcd_gpio_of_match, 118 }, 119 .probe = wcd_gpio_probe, 120 }; 121 122 module_platform_driver(wcd_gpio_driver); 123 MODULE_DESCRIPTION("Qualcomm Technologies, Inc WCD GPIO control driver"); 124 MODULE_LICENSE("GPL v2"); 125