drivers/gpio/gpio-rc5t583.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * GPIO driver for RICOH583 power management chip.
   4  *
   5  * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
   6  * Author: Laxman dewangan <ldewangan@nvidia.com>
   7  *
   8  * Based on code
   9  *      Copyright (C) 2011 RICOH COMPANY,LTD
  10  */
  11 #include <linux/init.h>
  12 #include <linux/kernel.h>
  13 #include <linux/slab.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/device.h>
  16 #include <linux/gpio/driver.h>
  17 #include <linux/mfd/rc5t583.h>
  18
  19 struct rc5t583_gpio {
  20         struct gpio_chip gpio_chip;
  21         struct rc5t583 *rc5t583;
  22 };
  23
  24 static int rc5t583_gpio_get(struct gpio_chip *gc, unsigned int offset)
  25 {
  26         struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);
  27         struct device *parent = rc5t583_gpio->rc5t583->dev;
  28         uint8_t val = 0;
  29         int ret;
  30
  31         ret = rc5t583_read(parent, RC5T583_GPIO_MON_IOIN, &val);
  32         if (ret < 0)
  33                 return ret;
  34
  35         return !!(val & BIT(offset));
  36 }
  37
  38 static void rc5t583_gpio_set(struct gpio_chip *gc, unsigned int offset, int val)
  39 {
  40         struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);
  41         struct device *parent = rc5t583_gpio->rc5t583->dev;
  42         if (val)
  43                 rc5t583_set_bits(parent, RC5T583_GPIO_IOOUT, BIT(offset));
  44         else
  45                 rc5t583_clear_bits(parent, RC5T583_GPIO_IOOUT, BIT(offset));
  46 }
  47
  48 static int rc5t583_gpio_dir_input(struct gpio_chip *gc, unsigned int offset)
  49 {
  50         struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);
  51         struct device *parent = rc5t583_gpio->rc5t583->dev;
  52         int ret;
  53
  54         ret = rc5t583_clear_bits(parent, RC5T583_GPIO_IOSEL, BIT(offset));
  55         if (ret < 0)
  56                 return ret;
  57
  58         /* Set pin to gpio mode */
  59         return rc5t583_clear_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset));
  60 }
  61
  62 static int rc5t583_gpio_dir_output(struct gpio_chip *gc, unsigned offset,
  63                         int value)
  64 {
  65         struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);
  66         struct device *parent = rc5t583_gpio->rc5t583->dev;
  67         int ret;
  68
  69         rc5t583_gpio_set(gc, offset, value);
  70         ret = rc5t583_set_bits(parent, RC5T583_GPIO_IOSEL, BIT(offset));
  71         if (ret < 0)
  72                 return ret;
  73
  74         /* Set pin to gpio mode */
  75         return rc5t583_clear_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset));
  76 }
  77
  78 static int rc5t583_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
  79 {
  80         struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);
  81
  82         if (offset < RC5T583_MAX_GPIO)
  83                 return rc5t583_gpio->rc5t583->irq_base +
  84                                 RC5T583_IRQ_GPIO0 + offset;
  85         return -EINVAL;
  86 }
  87
  88 static void rc5t583_gpio_free(struct gpio_chip *gc, unsigned offset)
  89 {
  90         struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);
  91         struct device *parent = rc5t583_gpio->rc5t583->dev;
  92
  93         rc5t583_set_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset));
  94 }
  95
  96 static int rc5t583_gpio_probe(struct platform_device *pdev)
  97 {
  98         struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent);
  99         struct rc5t583_platform_data *pdata = dev_get_platdata(rc5t583->dev);
 100         struct rc5t583_gpio *rc5t583_gpio;
 101
 102         rc5t583_gpio = devm_kzalloc(&pdev->dev, sizeof(*rc5t583_gpio),
 103                                         GFP_KERNEL);
 104         if (!rc5t583_gpio)
 105                 return -ENOMEM;
 106
 107         rc5t583_gpio->gpio_chip.label = "gpio-rc5t583",
 108         rc5t583_gpio->gpio_chip.owner = THIS_MODULE,
 109         rc5t583_gpio->gpio_chip.free = rc5t583_gpio_free,
 110         rc5t583_gpio->gpio_chip.direction_input = rc5t583_gpio_dir_input,
 111         rc5t583_gpio->gpio_chip.direction_output = rc5t583_gpio_dir_output,
 112         rc5t583_gpio->gpio_chip.set = rc5t583_gpio_set,
 113         rc5t583_gpio->gpio_chip.get = rc5t583_gpio_get,
 114         rc5t583_gpio->gpio_chip.to_irq = rc5t583_gpio_to_irq,
 115         rc5t583_gpio->gpio_chip.ngpio = RC5T583_MAX_GPIO,
 116         rc5t583_gpio->gpio_chip.can_sleep = true,
 117         rc5t583_gpio->gpio_chip.parent = &pdev->dev;
 118         rc5t583_gpio->gpio_chip.base = -1;
 119         rc5t583_gpio->rc5t583 = rc5t583;
 120
 121         if (pdata && pdata->gpio_base)
 122                 rc5t583_gpio->gpio_chip.base = pdata->gpio_base;
 123
 124         return devm_gpiochip_add_data(&pdev->dev, &rc5t583_gpio->gpio_chip,
 125                                       rc5t583_gpio);
 126 }
 127
 128 static struct platform_driver rc5t583_gpio_driver = {
 129         .driver = {
 130                 .name    = "rc5t583-gpio",
 131         },
 132         .probe          = rc5t583_gpio_probe,
 133 };
 134
 135 static int __init rc5t583_gpio_init(void)
 136 {
 137         return platform_driver_register(&rc5t583_gpio_driver);
 138 }
 139 subsys_initcall(rc5t583_gpio_init);