Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 | // SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 2016 Texas Instruments Incorporated - http://www.ti.com/ * Keerthy <j-keerthy@ti.com> * * Based on the TPS65218 driver */ #include <linux/gpio/driver.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/regmap.h> #include <linux/mfd/lp873x.h> #define BITS_PER_GPO 0x4 #define LP873X_GPO_CTRL_OD 0x2 struct lp873x_gpio { struct gpio_chip chip; struct lp873x *lp873; }; static int lp873x_gpio_get_direction(struct gpio_chip *chip, unsigned int offset) { /* This device is output only */ return GPIO_LINE_DIRECTION_OUT; } static int lp873x_gpio_direction_input(struct gpio_chip *chip, unsigned int offset) { /* This device is output only */ return -EINVAL; } static int lp873x_gpio_direction_output(struct gpio_chip *chip, unsigned int offset, int value) { struct lp873x_gpio *gpio = gpiochip_get_data(chip); /* Set the initial value */ return regmap_update_bits(gpio->lp873->regmap, LP873X_REG_GPO_CTRL, BIT(offset * BITS_PER_GPO), value ? BIT(offset * BITS_PER_GPO) : 0); } static int lp873x_gpio_get(struct gpio_chip *chip, unsigned int offset) { struct lp873x_gpio *gpio = gpiochip_get_data(chip); int ret, val; ret = regmap_read(gpio->lp873->regmap, LP873X_REG_GPO_CTRL, &val); if (ret < 0) return ret; return val & BIT(offset * BITS_PER_GPO); } static void lp873x_gpio_set(struct gpio_chip *chip, unsigned int offset, int value) { struct lp873x_gpio *gpio = gpiochip_get_data(chip); regmap_update_bits(gpio->lp873->regmap, LP873X_REG_GPO_CTRL, BIT(offset * BITS_PER_GPO), value ? BIT(offset * BITS_PER_GPO) : 0); } static int lp873x_gpio_request(struct gpio_chip *gc, unsigned int offset) { struct lp873x_gpio *gpio = gpiochip_get_data(gc); int ret; switch (offset) { case 0: /* No MUX Set up Needed for GPO */ break; case 1: /* Setup the CLKIN_PIN_SEL MUX to GPO2 */ ret = regmap_update_bits(gpio->lp873->regmap, LP873X_REG_CONFIG, LP873X_CONFIG_CLKIN_PIN_SEL, 0); if (ret) return ret; break; default: return -EINVAL; } return 0; } static int lp873x_gpio_set_config(struct gpio_chip *gc, unsigned offset, unsigned long config) { struct lp873x_gpio *gpio = gpiochip_get_data(gc); switch (pinconf_to_config_param(config)) { case PIN_CONFIG_DRIVE_OPEN_DRAIN: return regmap_update_bits(gpio->lp873->regmap, LP873X_REG_GPO_CTRL, BIT(offset * BITS_PER_GPO + LP873X_GPO_CTRL_OD), BIT(offset * BITS_PER_GPO + LP873X_GPO_CTRL_OD)); case PIN_CONFIG_DRIVE_PUSH_PULL: return regmap_update_bits(gpio->lp873->regmap, LP873X_REG_GPO_CTRL, BIT(offset * BITS_PER_GPO + LP873X_GPO_CTRL_OD), 0); default: return -ENOTSUPP; } } static const struct gpio_chip template_chip = { .label = "lp873x-gpio", .owner = THIS_MODULE, .request = lp873x_gpio_request, .get_direction = lp873x_gpio_get_direction, .direction_input = lp873x_gpio_direction_input, .direction_output = lp873x_gpio_direction_output, .get = lp873x_gpio_get, .set = lp873x_gpio_set, .set_config = lp873x_gpio_set_config, .base = -1, .ngpio = 2, .can_sleep = true, }; static int lp873x_gpio_probe(struct platform_device *pdev) { struct lp873x_gpio *gpio; int ret; gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); if (!gpio) return -ENOMEM; platform_set_drvdata(pdev, gpio); gpio->lp873 = dev_get_drvdata(pdev->dev.parent); gpio->chip = template_chip; gpio->chip.parent = gpio->lp873->dev; ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio); if (ret < 0) { dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret); return ret; } return 0; } static const struct platform_device_id lp873x_gpio_id_table[] = { { "lp873x-gpio", }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(platform, lp873x_gpio_id_table); static struct platform_driver lp873x_gpio_driver = { .driver = { .name = "lp873x-gpio", }, .probe = lp873x_gpio_probe, .id_table = lp873x_gpio_id_table, }; module_platform_driver(lp873x_gpio_driver); MODULE_AUTHOR("Keerthy <j-keerthy@ti.com>"); MODULE_DESCRIPTION("LP873X GPIO driver"); MODULE_LICENSE("GPL v2"); |