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
  15 struct tps65086_gpio {
  16         struct gpio_chip chip;
  17         struct tps65086 *tps;
  18 };
  19
  20 static int tps65086_gpio_get_direction(struct gpio_chip *chip,
  21                                        unsigned offset)
  22 {
  23         /* This device is output only */
  24         return 0;
  25 }
  26
  27 static int tps65086_gpio_direction_input(struct gpio_chip *chip,
  28                                          unsigned offset)
  29 {
  30         /* This device is output only */
  31         return -EINVAL;
  32 }
  33
  34 static 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
  46 static 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
  58 static 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
  67 static 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
  80 static 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
 104 static 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
 113 static const struct platform_device_id tps65086_gpio_id_table[] = {
 114         { "tps65086-gpio", },
 115         { /* sentinel */ }
 116 };
 117 MODULE_DEVICE_TABLE(platform, tps65086_gpio_id_table);
 118
 119 static 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 };
 127 module_platform_driver(tps65086_gpio_driver);
 128
 129 MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
 130 MODULE_DESCRIPTION("TPS65086 GPIO driver");
 131 MODULE_LICENSE("GPL v2");