projects / mirror_ubuntu-hirsute-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 93847930 MV |
1 | /* |
| 2 | * ROHM BD9571MWV-M GPIO driver | |
| 3 | * | |
| 4 | * Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@gmail.com> | |
| 5 | * | |
| 6 | * This program is free software; you can redistribute it and/or | |
| 7 | * modify it under the terms of the GNU General Public License version 2 as | |
| 8 | * published by the Free Software Foundation. | |
| 9 | * | |
| 10 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any | |
| 11 | * kind, whether expressed or implied; without even the implied warranty | |
| 12 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 13 | * GNU General Public License version 2 for more details. | |
| 14 | * | |
| 15 | * Based on the TPS65086 driver | |
| 16 | * | |
| 17 | * NOTE: Interrupts are not supported yet. | |
| 18 | */ | |
| 19 | ||
| 20 | #include <linux/gpio/driver.h> | |
| 21 | #include <linux/module.h> | |
| 22 | #include <linux/platform_device.h> | |
| 23 | ||
| 24 | #include <linux/mfd/bd9571mwv.h> | |
| 25 | ||
| 26 | struct bd9571mwv_gpio { | |
| 27 | struct gpio_chip chip; | |
| 28 | struct bd9571mwv *bd; | |
| 29 | }; | |
| 30 | ||
| 31 | static int bd9571mwv_gpio_get_direction(struct gpio_chip *chip, | |
| 32 | unsigned int offset) | |
| 33 | { | |
| 34 | struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip); | |
| 35 | int ret, val; | |
| 36 | ||
| 37 | ret = regmap_read(gpio->bd->regmap, BD9571MWV_GPIO_DIR, &val); | |
| 38 | if (ret < 0) | |
| 39 | return ret; | |
| e42615ec MV |
40 | if (val & BIT(offset)) |
| 41 | return GPIO_LINE_DIRECTION_IN; | |
| 93847930 | 42 | |
| e42615ec | 43 | return GPIO_LINE_DIRECTION_OUT; |
| 93847930 MV |
44 | } |
| 45 | ||
| 46 | static int bd9571mwv_gpio_direction_input(struct gpio_chip *chip, | |
| 47 | unsigned int offset) | |
| 48 | { | |
| 49 | struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip); | |
| 50 | ||
| 51 | regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_DIR, | |
| 52 | BIT(offset), 0); | |
| 53 | ||
| 54 | return 0; | |
| 55 | } | |
| 56 | ||
| 57 | static int bd9571mwv_gpio_direction_output(struct gpio_chip *chip, | |
| 58 | unsigned int offset, int value) | |
| 59 | { | |
| 60 | struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip); | |
| 61 | ||
| 62 | /* Set the initial value */ | |
| 63 | regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_OUT, | |
| 64 | BIT(offset), value ? BIT(offset) : 0); | |
| 65 | regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_DIR, | |
| 66 | BIT(offset), BIT(offset)); | |
| 67 | ||
| 68 | return 0; | |
| 69 | } | |
| 70 | ||
| 71 | static int bd9571mwv_gpio_get(struct gpio_chip *chip, unsigned int offset) | |
| 72 | { | |
| 73 | struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip); | |
| 74 | int ret, val; | |
| 75 | ||
| 76 | ret = regmap_read(gpio->bd->regmap, BD9571MWV_GPIO_IN, &val); | |
| 77 | if (ret < 0) | |
| 78 | return ret; | |
| 79 | ||
| 80 | return val & BIT(offset); | |
| 81 | } | |
| 82 | ||
| 83 | static void bd9571mwv_gpio_set(struct gpio_chip *chip, unsigned int offset, | |
| 84 | int value) | |
| 85 | { | |
| 86 | struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip); | |
| 87 | ||
| 88 | regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_OUT, | |
| 89 | BIT(offset), value ? BIT(offset) : 0); | |
| 90 | } | |
| 91 | ||
| 92 | static const struct gpio_chip template_chip = { | |
| 93 | .label = "bd9571mwv-gpio", | |
| 94 | .owner = THIS_MODULE, | |
| 95 | .get_direction = bd9571mwv_gpio_get_direction, | |
| 96 | .direction_input = bd9571mwv_gpio_direction_input, | |
| 97 | .direction_output = bd9571mwv_gpio_direction_output, | |
| 98 | .get = bd9571mwv_gpio_get, | |
| 99 | .set = bd9571mwv_gpio_set, | |
| 100 | .base = -1, | |
| 101 | .ngpio = 2, | |
| 102 | .can_sleep = true, | |
| 103 | }; | |
| 104 | ||
| 105 | static int bd9571mwv_gpio_probe(struct platform_device *pdev) | |
| 106 | { | |
| 107 | struct bd9571mwv_gpio *gpio; | |
| 108 | int ret; | |
| 109 | ||
| 110 | gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); | |
| 111 | if (!gpio) | |
| 112 | return -ENOMEM; | |
| 113 | ||
| 114 | platform_set_drvdata(pdev, gpio); | |
| 115 | ||
| 116 | gpio->bd = dev_get_drvdata(pdev->dev.parent); | |
| 117 | gpio->chip = template_chip; | |
| 118 | gpio->chip.parent = gpio->bd->dev; | |
| 119 | ||
| 120 | ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio); | |
| 121 | if (ret < 0) { | |
| 122 | dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret); | |
| 123 | return ret; | |
| 124 | } | |
| 125 | ||
| 126 | return 0; | |
| 127 | } | |
| 128 | ||
| 129 | static const struct platform_device_id bd9571mwv_gpio_id_table[] = { | |
| 130 | { "bd9571mwv-gpio", }, | |
| 131 | { /* sentinel */ } | |
| 132 | }; | |
| 133 | MODULE_DEVICE_TABLE(platform, bd9571mwv_gpio_id_table); | |
| 134 | ||
| 135 | static struct platform_driver bd9571mwv_gpio_driver = { | |
| 136 | .driver = { | |
| 137 | .name = "bd9571mwv-gpio", | |
| 138 | }, | |
| 139 | .probe = bd9571mwv_gpio_probe, | |
| 140 | .id_table = bd9571mwv_gpio_id_table, | |
| 141 | }; | |
| 142 | module_platform_driver(bd9571mwv_gpio_driver); | |
| 143 | ||
| 144 | MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@gmail.com>"); | |
| 145 | MODULE_DESCRIPTION("BD9571MWV GPIO driver"); | |
| 146 | MODULE_LICENSE("GPL v2"); |