LXR linux/drivers/gpio/gpio-tps65086.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
   4 *      Andrew F. Davis <afd@ti.com>
   5 *
   6 * Based on the TPS65912 driver
   7 */
   8
   9#include <linux/gpio/driver.h>
  10#include <linux/module.h>
  11#include <linux/platform_device.h>
  12
  13#include <linux/mfd/tps65086.h>
  14
  15struct tps65086_gpio {
  16        struct gpio_chip chip;
  17        struct tps65086 *tps;
  18};
  19
  20static int tps65086_gpio_get_direction(struct gpio_chip *chip,
  21                                       unsigned offset)
  22{
  23        /* This device is output only */
  24        return GPIO_LINE_DIRECTION_OUT;
  25}
  26
  27static int tps65086_gpio_direction_input(struct gpio_chip *chip,
  28                                         unsigned offset)
  29{
  30        /* This device is output only */
  31        return -EINVAL;
  32}
  33
  34static int tps65086_gpio_direction_output(struct gpio_chip *chip,
  35                                          unsigned offset, int value)
  36{
  37        struct tps65086_gpio *gpio = gpiochip_get_data(chip);
  38
  39        /* Set the initial value */
  40        regmap_update_bits(gpio->tps->regmap, TPS65086_GPOCTRL,
  41                           BIT(4 + offset), value ? BIT(4 + offset) : 0);
  42
  43        return 0;
  44}
  45
  46static int tps65086_gpio_get(struct gpio_chip *chip, unsigned offset)
  47{
  48        struct tps65086_gpio *gpio = gpiochip_get_data(chip);
  49        int ret, val;
  50
  51        ret = regmap_read(gpio->tps->regmap, TPS65086_GPOCTRL, &val);
  52        if (ret < 0)
  53                return ret;
  54
  55        return val & BIT(4 + offset);
  56}
  57
  58static void tps65086_gpio_set(struct gpio_chip *chip, unsigned offset,
  59                              int value)
  60{
  61        struct tps65086_gpio *gpio = gpiochip_get_data(chip);
  62
  63        regmap_update_bits(gpio->tps->regmap, TPS65086_GPOCTRL,
  64                           BIT(4 + offset), value ? BIT(4 + offset) : 0);
  65}
  66
  67static const struct gpio_chip template_chip = {
  68        .label                  = "tps65086-gpio",
  69        .owner                  = THIS_MODULE,
  70        .get_direction          = tps65086_gpio_get_direction,
  71        .direction_input        = tps65086_gpio_direction_input,
  72        .direction_output       = tps65086_gpio_direction_output,
  73        .get                    = tps65086_gpio_get,
  74        .set                    = tps65086_gpio_set,
  75        .base                   = -1,
  76        .ngpio                  = 4,
  77        .can_sleep              = true,
  78};
  79
  80static int tps65086_gpio_probe(struct platform_device *pdev)
  81{
  82        struct tps65086_gpio *gpio;
  83        int ret;
  84
  85        gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
  86        if (!gpio)
  87                return -ENOMEM;
  88
  89        platform_set_drvdata(pdev, gpio);
  90
  91        gpio->tps = dev_get_drvdata(pdev->dev.parent);
  92        gpio->chip = template_chip;
  93        gpio->chip.parent = gpio->tps->dev;
  94
  95        ret = gpiochip_add_data(&gpio->chip, gpio);
  96        if (ret < 0) {
  97                dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
  98                return ret;
  99        }
 100
 101        return 0;
 102}
 103
 104static int tps65086_gpio_remove(struct platform_device *pdev)
 105{
 106        struct tps65086_gpio *gpio = platform_get_drvdata(pdev);
 107
 108        gpiochip_remove(&gpio->chip);
 109
 110        return 0;
 111}
 112
 113static const struct platform_device_id tps65086_gpio_id_table[] = {
 114        { "tps65086-gpio", },
 115        { /* sentinel */ }
 116};
 117MODULE_DEVICE_TABLE(platform, tps65086_gpio_id_table);
 118
 119static struct platform_driver tps65086_gpio_driver = {
 120        .driver = {
 121                .name = "tps65086-gpio",
 122        },
 123        .probe = tps65086_gpio_probe,
 124        .remove = tps65086_gpio_remove,
 125        .id_table = tps65086_gpio_id_table,
 126};
 127module_platform_driver(tps65086_gpio_driver);
 128
 129MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
 130MODULE_DESCRIPTION("TPS65086 GPIO driver");
 131MODULE_LICENSE("GPL v2");
 132