drivers/gpio/gpio-tps65086.c

   1 /*
   2  * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
   3  *      Andrew F. Davis <afd@ti.com>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  10  * kind, whether expressed or implied; without even the implied warranty
  11  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License version 2 for more details.
  13  *
  14  * Based on the TPS65912 driver
  15  */
  16
  17 #include <linux/gpio.h>
  18 #include <linux/module.h>
  19 #include <linux/platform_device.h>
  20
  21 #include <linux/mfd/tps65086.h>
  22
  23 struct tps65086_gpio {
  24         struct gpio_chip chip;
  25         struct tps65086 *tps;
  26 };
  27
  28 static int tps65086_gpio_get_direction(struct gpio_chip *chip,
  29                                        unsigned offset)
  30 {
  31         /* This device is output only */
  32         return 0;
  33 }
  34
  35 static int tps65086_gpio_direction_input(struct gpio_chip *chip,
  36                                          unsigned offset)
  37 {
  38         /* This device is output only */
  39         return -EINVAL;
  40 }
  41
  42 static int tps65086_gpio_direction_output(struct gpio_chip *chip,
  43                                           unsigned offset, int value)
  44 {
  45         struct tps65086_gpio *gpio = gpiochip_get_data(chip);
  46
  47         /* Set the initial value */
  48         regmap_update_bits(gpio->tps->regmap, TPS65086_GPOCTRL,
  49                            BIT(4 + offset), value ? BIT(4 + offset) : 0);
  50
  51         return 0;
  52 }
  53
  54 static int tps65086_gpio_get(struct gpio_chip *chip, unsigned offset)
  55 {
  56         struct tps65086_gpio *gpio = gpiochip_get_data(chip);
  57         int ret, val;
  58
  59         ret = regmap_read(gpio->tps->regmap, TPS65086_GPOCTRL, &val);
  60         if (ret < 0)
  61                 return ret;
  62
  63         return val & BIT(4 + offset);
  64 }
  65
  66 static void tps65086_gpio_set(struct gpio_chip *chip, unsigned offset,
  67                               int value)
  68 {
  69         struct tps65086_gpio *gpio = gpiochip_get_data(chip);
  70
  71         regmap_update_bits(gpio->tps->regmap, TPS65086_GPOCTRL,
  72                            BIT(4 + offset), value ? BIT(4 + offset) : 0);
  73 }
  74
  75 static const struct gpio_chip template_chip = {
  76         .label                  = "tps65086-gpio",
  77         .owner                  = THIS_MODULE,
  78         .get_direction          = tps65086_gpio_get_direction,
  79         .direction_input        = tps65086_gpio_direction_input,
  80         .direction_output       = tps65086_gpio_direction_output,
  81         .get                    = tps65086_gpio_get,
  82         .set                    = tps65086_gpio_set,
  83         .base                   = -1,
  84         .ngpio                  = 4,
  85         .can_sleep              = true,
  86 };
  87
  88 static int tps65086_gpio_probe(struct platform_device *pdev)
  89 {
  90         struct tps65086_gpio *gpio;
  91         int ret;
  92
  93         gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
  94         if (!gpio)
  95                 return -ENOMEM;
  96
  97         platform_set_drvdata(pdev, gpio);
  98
  99         gpio->tps = dev_get_drvdata(pdev->dev.parent);
 100         gpio->chip = template_chip;
 101         gpio->chip.parent = gpio->tps->dev;
 102
 103         ret = gpiochip_add_data(&gpio->chip, gpio);
 104         if (ret < 0) {
 105                 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
 106                 return ret;
 107         }
 108
 109         return 0;
 110 }
 111
 112 static int tps65086_gpio_remove(struct platform_device *pdev)
 113 {
 114         struct tps65086_gpio *gpio = platform_get_drvdata(pdev);
 115
 116         gpiochip_remove(&gpio->chip);
 117
 118         return 0;
 119 }
 120
 121 static const struct platform_device_id tps65086_gpio_id_table[] = {
 122         { "tps65086-gpio", },
 123         { /* sentinel */ }
 124 };
 125 MODULE_DEVICE_TABLE(platform, tps65086_gpio_id_table);
 126
 127 static struct platform_driver tps65086_gpio_driver = {
 128         .driver = {
 129                 .name = "tps65086-gpio",
 130         },
 131         .probe = tps65086_gpio_probe,
 132         .remove = tps65086_gpio_remove,
 133         .id_table = tps65086_gpio_id_table,
 134 };
 135 module_platform_driver(tps65086_gpio_driver);
 136
 137 MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
 138 MODULE_DESCRIPTION("TPS65086 GPIO driver");
 139 MODULE_LICENSE("GPL v2");