LXR linux/drivers/gpio/gpio-bd9571mwv.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * ROHM BD9571MWV-M and BD9574MWF-M GPIO driver
   4 *
   5 * Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@gmail.com>
   6 *
   7 * Based on the TPS65086 driver
   8 *
   9 * NOTE: Interrupts are not supported yet.
  10 */
  11
  12#include <linux/gpio/driver.h>
  13#include <linux/mfd/rohm-generic.h>
  14#include <linux/module.h>
  15#include <linux/platform_device.h>
  16
  17#include <linux/mfd/bd9571mwv.h>
  18
  19struct bd9571mwv_gpio {
  20        struct regmap *regmap;
  21        struct gpio_chip chip;
  22};
  23
  24static int bd9571mwv_gpio_get_direction(struct gpio_chip *chip,
  25                                       unsigned int offset)
  26{
  27        struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
  28        int ret, val;
  29
  30        ret = regmap_read(gpio->regmap, BD9571MWV_GPIO_DIR, &val);
  31        if (ret < 0)
  32                return ret;
  33        if (val & BIT(offset))
  34                return GPIO_LINE_DIRECTION_IN;
  35
  36        return GPIO_LINE_DIRECTION_OUT;
  37}
  38
  39static int bd9571mwv_gpio_direction_input(struct gpio_chip *chip,
  40                                         unsigned int offset)
  41{
  42        struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
  43
  44        regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_DIR, BIT(offset), 0);
  45
  46        return 0;
  47}
  48
  49static int bd9571mwv_gpio_direction_output(struct gpio_chip *chip,
  50                                          unsigned int offset, int value)
  51{
  52        struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
  53
  54        /* Set the initial value */
  55        regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_OUT,
  56                           BIT(offset), value ? BIT(offset) : 0);
  57        regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_DIR,
  58                           BIT(offset), BIT(offset));
  59
  60        return 0;
  61}
  62
  63static int bd9571mwv_gpio_get(struct gpio_chip *chip, unsigned int offset)
  64{
  65        struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
  66        int ret, val;
  67
  68        ret = regmap_read(gpio->regmap, BD9571MWV_GPIO_IN, &val);
  69        if (ret < 0)
  70                return ret;
  71
  72        return val & BIT(offset);
  73}
  74
  75static void bd9571mwv_gpio_set(struct gpio_chip *chip, unsigned int offset,
  76                              int value)
  77{
  78        struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
  79
  80        regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_OUT,
  81                           BIT(offset), value ? BIT(offset) : 0);
  82}
  83
  84static const struct gpio_chip template_chip = {
  85        .label                  = "bd9571mwv-gpio",
  86        .owner                  = THIS_MODULE,
  87        .get_direction          = bd9571mwv_gpio_get_direction,
  88        .direction_input        = bd9571mwv_gpio_direction_input,
  89        .direction_output       = bd9571mwv_gpio_direction_output,
  90        .get                    = bd9571mwv_gpio_get,
  91        .set                    = bd9571mwv_gpio_set,
  92        .base                   = -1,
  93        .ngpio                  = 2,
  94        .can_sleep              = true,
  95};
  96
  97static int bd9571mwv_gpio_probe(struct platform_device *pdev)
  98{
  99        struct bd9571mwv_gpio *gpio;
 100
 101        gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
 102        if (!gpio)
 103                return -ENOMEM;
 104
 105        gpio->regmap = dev_get_regmap(pdev->dev.parent, NULL);
 106        gpio->chip = template_chip;
 107        gpio->chip.parent = pdev->dev.parent;
 108
 109        return devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
 110}
 111
 112static const struct platform_device_id bd9571mwv_gpio_id_table[] = {
 113        { "bd9571mwv-gpio", ROHM_CHIP_TYPE_BD9571 },
 114        { "bd9574mwf-gpio", ROHM_CHIP_TYPE_BD9574 },
 115        { /* sentinel */ }
 116};
 117MODULE_DEVICE_TABLE(platform, bd9571mwv_gpio_id_table);
 118
 119static struct platform_driver bd9571mwv_gpio_driver = {
 120        .driver = {
 121                .name = "bd9571mwv-gpio",
 122        },
 123        .probe = bd9571mwv_gpio_probe,
 124        .id_table = bd9571mwv_gpio_id_table,
 125};
 126module_platform_driver(bd9571mwv_gpio_driver);
 127
 128MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@gmail.com>");
 129MODULE_DESCRIPTION("BD9571MWV GPIO driver");
 130MODULE_LICENSE("GPL v2");
 131