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 *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
  42 static 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
  55 static 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
  67 static 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
  76 static 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
  88 static 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
 115 err:
 116         kfree(tps65912_gpio);
 117         return ret;
 118 }
 119
 120 static 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
 132 static 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
 141 static int __init tps65912_gpio_init(void)
 142 {
 143         return platform_driver_register(&tps65912_gpio_driver);
 144 }
 145 subsys_initcall(tps65912_gpio_init);
 146
 147 static void __exit tps65912_gpio_exit(void)
 148 {
 149         platform_driver_unregister(&tps65912_gpio_driver);
 150 }
 151 module_exit(tps65912_gpio_exit);
 152
 153 MODULE_AUTHOR("Margarita Olaya Cabrera <magi@slimlogic.co.uk>");
 154 MODULE_DESCRIPTION("GPIO interface for TPS65912 PMICs");
 155 MODULE_LICENSE("GPL v2");
 156 MODULE_ALIAS("platform:tps65912-gpio");