linux/drivers/gpio/gpio-tps65912.c
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   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
  24struct tps65912_gpio_data {
  25        struct tps65912 *tps65912;
  26        struct gpio_chip gpio_chip;
  27};
  28
  29static int tps65912_gpio_get(struct gpio_chip *gc, unsigned offset)
  30{
  31        struct tps65912 *tps65912 = container_of(gc, struct tps65912, gpio);
  32        int val;
  33
  34        val = tps65912_reg_read(tps65912, TPS65912_GPIO1 + offset);
  35
  36        if (val & GPIO_STS_MASK)
  37                return 1;
  38
  39        return 0;
  40}
  41
  42static void tps65912_gpio_set(struct gpio_chip *gc, unsigned offset,
  43                              int value)
  44{
  45        struct tps65912 *tps65912 = container_of(gc, struct tps65912, gpio);
  46
  47        if (value)
  48                tps65912_set_bits(tps65912, TPS65912_GPIO1 + offset,
  49                                                        GPIO_SET_MASK);
  50        else
  51                tps65912_clear_bits(tps65912, TPS65912_GPIO1 + offset,
  52                                                                GPIO_SET_MASK);
  53}
  54
  55static int tps65912_gpio_output(struct gpio_chip *gc, unsigned offset,
  56                                int value)
  57{
  58        struct tps65912 *tps65912 = container_of(gc, struct tps65912, gpio);
  59
  60        /* Set the initial value */
  61        tps65912_gpio_set(gc, offset, value);
  62
  63        return tps65912_set_bits(tps65912, TPS65912_GPIO1 + offset,
  64                                                                GPIO_CFG_MASK);
  65}
  66
  67static int tps65912_gpio_input(struct gpio_chip *gc, unsigned offset)
  68{
  69        struct tps65912 *tps65912 = container_of(gc, struct tps65912, gpio);
  70
  71        return tps65912_clear_bits(tps65912, TPS65912_GPIO1 + offset,
  72                                                                GPIO_CFG_MASK);
  73
  74}
  75
  76static struct gpio_chip template_chip = {
  77        .label                  = "tps65912",
  78        .owner                  = THIS_MODULE,
  79        .direction_input        = tps65912_gpio_input,
  80        .direction_output       = tps65912_gpio_output,
  81        .get                    = tps65912_gpio_get,
  82        .set                    = tps65912_gpio_set,
  83        .can_sleep              = 1,
  84        .ngpio                  = 5,
  85        .base                   = -1,
  86};
  87
  88static int __devinit tps65912_gpio_probe(struct platform_device *pdev)
  89{
  90        struct tps65912 *tps65912 = dev_get_drvdata(pdev->dev.parent);
  91        struct tps65912_board *pdata = tps65912->dev->platform_data;
  92        struct tps65912_gpio_data *tps65912_gpio;
  93        int ret;
  94
  95        tps65912_gpio = kzalloc(sizeof(*tps65912_gpio), GFP_KERNEL);
  96        if (tps65912_gpio == NULL)
  97                return -ENOMEM;
  98
  99        tps65912_gpio->tps65912 = tps65912;
 100        tps65912_gpio->gpio_chip = template_chip;
 101        tps65912_gpio->gpio_chip.dev = &pdev->dev;
 102        if (pdata && pdata->gpio_base)
 103                tps65912_gpio->gpio_chip.base = pdata->gpio_base;
 104
 105        ret = gpiochip_add(&tps65912_gpio->gpio_chip);
 106        if (ret < 0) {
 107                dev_err(&pdev->dev, "Failed to register gpiochip, %d\n", ret);
 108                goto err;
 109        }
 110
 111        platform_set_drvdata(pdev, tps65912_gpio);
 112
 113        return ret;
 114
 115err:
 116        kfree(tps65912_gpio);
 117        return ret;
 118}
 119
 120static int __devexit tps65912_gpio_remove(struct platform_device *pdev)
 121{
 122        struct tps65912_gpio_data  *tps65912_gpio = platform_get_drvdata(pdev);
 123        int ret;
 124
 125        ret = gpiochip_remove(&tps65912_gpio->gpio_chip);
 126        if (ret == 0)
 127                kfree(tps65912_gpio);
 128
 129        return ret;
 130}
 131
 132static struct platform_driver tps65912_gpio_driver = {
 133        .driver = {
 134                .name = "tps65912-gpio",
 135                .owner = THIS_MODULE,
 136        },
 137        .probe = tps65912_gpio_probe,
 138        .remove = __devexit_p(tps65912_gpio_remove),
 139};
 140
 141static int __init tps65912_gpio_init(void)
 142{
 143        return platform_driver_register(&tps65912_gpio_driver);
 144}
 145subsys_initcall(tps65912_gpio_init);
 146
 147static void __exit tps65912_gpio_exit(void)
 148{
 149        platform_driver_unregister(&tps65912_gpio_driver);
 150}
 151module_exit(tps65912_gpio_exit);
 152
 153MODULE_AUTHOR("Margarita Olaya Cabrera <magi@slimlogic.co.uk>");
 154MODULE_DESCRIPTION("GPIO interface for TPS65912 PMICs");
 155MODULE_LICENSE("GPL v2");
 156MODULE_ALIAS("platform:tps65912-gpio");
 157
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