drivers/gpio/gpio-tps65912.c

   1 /*
   2  * Copyright 2011 Texas Instruments Inc.
   3  *
   4  * Author: Margarita Olaya <magi@slimlogic.co.uk>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify it
   7  *  under  the terms of the GNU General  Public License as published by the
   8  *  Free Software Foundation;  either version 2 of the License, or (at your
   9  *  option) any later version.
  10  *
  11  * This driver is based on wm8350 implementation.
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/errno.h>
  17 #include <linux/gpio.h>
  18 #include <linux/mfd/core.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/seq_file.h>
  21 #include <linux/slab.h>
  22 #include <linux/mfd/tps65912.h>
  23
  24 struct tps65912_gpio_data {
  25         struct tps65912 *tps65912;
  26         struct gpio_chip gpio_chip;
  27 };
  28
  29 static int tps65912_gpio_get(struct gpio_chip *gc, unsigned offset)
  30 {
  31         struct tps65912_gpio_data *tps65912_gpio = gpiochip_get_data(gc);
  32         struct tps65912 *tps65912 = tps65912_gpio->tps65912;
  33         int val;
  34
  35         val = tps65912_reg_read(tps65912, TPS65912_GPIO1 + offset);
  36
  37         if (val & GPIO_STS_MASK)
  38                 return 1;
  39
  40         return 0;
  41 }
  42
  43 static void tps65912_gpio_set(struct gpio_chip *gc, unsigned offset,
  44                               int value)
  45 {
  46         struct tps65912_gpio_data *tps65912_gpio = gpiochip_get_data(gc);
  47         struct tps65912 *tps65912 = tps65912_gpio->tps65912;
  48
  49         if (value)
  50                 tps65912_set_bits(tps65912, TPS65912_GPIO1 + offset,
  51                                                         GPIO_SET_MASK);
  52         else
  53                 tps65912_clear_bits(tps65912, TPS65912_GPIO1 + offset,
  54                                                                 GPIO_SET_MASK);
  55 }
  56
  57 static int tps65912_gpio_output(struct gpio_chip *gc, unsigned offset,
  58                                 int value)
  59 {
  60         struct tps65912_gpio_data *tps65912_gpio = gpiochip_get_data(gc);
  61         struct tps65912 *tps65912 = tps65912_gpio->tps65912;
  62
  63         /* Set the initial value */
  64         tps65912_gpio_set(gc, offset, value);
  65
  66         return tps65912_set_bits(tps65912, TPS65912_GPIO1 + offset,
  67                                                                 GPIO_CFG_MASK);
  68 }
  69
  70 static int tps65912_gpio_input(struct gpio_chip *gc, unsigned offset)
  71 {
  72         struct tps65912_gpio_data *tps65912_gpio = gpiochip_get_data(gc);
  73         struct tps65912 *tps65912 = tps65912_gpio->tps65912;
  74
  75         return tps65912_clear_bits(tps65912, TPS65912_GPIO1 + offset,
  76                                                                 GPIO_CFG_MASK);
  77 }
  78
  79 static struct gpio_chip template_chip = {
  80         .label                  = "tps65912",
  81         .owner                  = THIS_MODULE,
  82         .direction_input        = tps65912_gpio_input,
  83         .direction_output       = tps65912_gpio_output,
  84         .get                    = tps65912_gpio_get,
  85         .set                    = tps65912_gpio_set,
  86         .can_sleep              = true,
  87         .ngpio                  = 5,
  88         .base                   = -1,
  89 };
  90
  91 static int tps65912_gpio_probe(struct platform_device *pdev)
  92 {
  93         struct tps65912 *tps65912 = dev_get_drvdata(pdev->dev.parent);
  94         struct tps65912_board *pdata = dev_get_platdata(tps65912->dev);
  95         struct tps65912_gpio_data *tps65912_gpio;
  96         int ret;
  97
  98         tps65912_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps65912_gpio),
  99                                      GFP_KERNEL);
 100         if (tps65912_gpio == NULL)
 101                 return -ENOMEM;
 102
 103         tps65912_gpio->tps65912 = tps65912;
 104         tps65912_gpio->gpio_chip = template_chip;
 105         tps65912_gpio->gpio_chip.parent = &pdev->dev;
 106         if (pdata && pdata->gpio_base)
 107                 tps65912_gpio->gpio_chip.base = pdata->gpio_base;
 108
 109         ret = devm_gpiochip_add_data(&pdev->dev, &tps65912_gpio->gpio_chip,
 110                                      tps65912_gpio);
 111         if (ret < 0) {
 112                 dev_err(&pdev->dev, "Failed to register gpiochip, %d\n", ret);
 113                 return ret;
 114         }
 115
 116         platform_set_drvdata(pdev, tps65912_gpio);
 117
 118         return ret;
 119 }
 120
 121 static struct platform_driver tps65912_gpio_driver = {
 122         .driver = {
 123                 .name = "tps65912-gpio",
 124         },
 125         .probe = tps65912_gpio_probe,
 126 };
 127
 128 static int __init tps65912_gpio_init(void)
 129 {
 130         return platform_driver_register(&tps65912_gpio_driver);
 131 }
 132 subsys_initcall(tps65912_gpio_init);
 133
 134 static void __exit tps65912_gpio_exit(void)
 135 {
 136         platform_driver_unregister(&tps65912_gpio_driver);
 137 }
 138 module_exit(tps65912_gpio_exit);
 139
 140 MODULE_AUTHOR("Margarita Olaya Cabrera <magi@slimlogic.co.uk>");
 141 MODULE_DESCRIPTION("GPIO interface for TPS65912 PMICs");
 142 MODULE_LICENSE("GPL v2");
 143 MODULE_ALIAS("platform:tps65912-gpio");