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
  19 struct bd9571mwv_gpio {
  20         struct regmap *regmap;
  21         struct gpio_chip chip;
  22 };
  23
  24 static 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
  39 static 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
  49 static 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
  63 static 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
  75 static 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
  84 static 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
  97 static 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
 112 static 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 };
 117 MODULE_DEVICE_TABLE(platform, bd9571mwv_gpio_id_table);
 118
 119 static 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 };
 126 module_platform_driver(bd9571mwv_gpio_driver);
 127
 128 MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@gmail.com>");
 129 MODULE_DESCRIPTION("BD9571MWV GPIO driver");
 130 MODULE_LICENSE("GPL v2");