drivers/gpio/gpio-tps65910.c

   1 /*
   2  * TI TPS6591x GPIO driver
   3  *
   4  * Copyright 2010 Texas Instruments Inc.
   5  *
   6  * Author: Graeme Gregory <gg@slimlogic.co.uk>
   7  * Author: Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>
   8  *
   9  *  This program is free software; you can redistribute it and/or modify it
  10  *  under  the terms of the GNU General  Public License as published by the
  11  *  Free Software Foundation;  either version 2 of the License, or (at your
  12  *  option) any later version.
  13  *
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/init.h>
  18 #include <linux/errno.h>
  19 #include <linux/gpio.h>
  20 #include <linux/i2c.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/mfd/tps65910.h>
  23 #include <linux/of_device.h>
  24
  25 struct tps65910_gpio {
  26         struct gpio_chip gpio_chip;
  27         struct tps65910 *tps65910;
  28 };
  29
  30 static int tps65910_gpio_get(struct gpio_chip *gc, unsigned offset)
  31 {
  32         struct tps65910_gpio *tps65910_gpio = gpiochip_get_data(gc);
  33         struct tps65910 *tps65910 = tps65910_gpio->tps65910;
  34         unsigned int val;
  35
  36         tps65910_reg_read(tps65910, TPS65910_GPIO0 + offset, &val);
  37
  38         if (val & GPIO_STS_MASK)
  39                 return 1;
  40
  41         return 0;
  42 }
  43
  44 static void tps65910_gpio_set(struct gpio_chip *gc, unsigned offset,
  45                               int value)
  46 {
  47         struct tps65910_gpio *tps65910_gpio = gpiochip_get_data(gc);
  48         struct tps65910 *tps65910 = tps65910_gpio->tps65910;
  49
  50         if (value)
  51                 tps65910_reg_set_bits(tps65910, TPS65910_GPIO0 + offset,
  52                                                 GPIO_SET_MASK);
  53         else
  54                 tps65910_reg_clear_bits(tps65910, TPS65910_GPIO0 + offset,
  55                                                 GPIO_SET_MASK);
  56 }
  57
  58 static int tps65910_gpio_output(struct gpio_chip *gc, unsigned offset,
  59                                 int value)
  60 {
  61         struct tps65910_gpio *tps65910_gpio = gpiochip_get_data(gc);
  62         struct tps65910 *tps65910 = tps65910_gpio->tps65910;
  63
  64         /* Set the initial value */
  65         tps65910_gpio_set(gc, offset, value);
  66
  67         return tps65910_reg_set_bits(tps65910, TPS65910_GPIO0 + offset,
  68                                                 GPIO_CFG_MASK);
  69 }
  70
  71 static int tps65910_gpio_input(struct gpio_chip *gc, unsigned offset)
  72 {
  73         struct tps65910_gpio *tps65910_gpio = gpiochip_get_data(gc);
  74         struct tps65910 *tps65910 = tps65910_gpio->tps65910;
  75
  76         return tps65910_reg_clear_bits(tps65910, TPS65910_GPIO0 + offset,
  77                                                 GPIO_CFG_MASK);
  78 }
  79
  80 #ifdef CONFIG_OF
  81 static struct tps65910_board *tps65910_parse_dt_for_gpio(struct device *dev,
  82                 struct tps65910 *tps65910, int chip_ngpio)
  83 {
  84         struct tps65910_board *tps65910_board = tps65910->of_plat_data;
  85         unsigned int prop_array[TPS6591X_MAX_NUM_GPIO];
  86         int ngpio = min(chip_ngpio, TPS6591X_MAX_NUM_GPIO);
  87         int ret;
  88         int idx;
  89
  90         tps65910_board->gpio_base = -1;
  91         ret = of_property_read_u32_array(tps65910->dev->of_node,
  92                         "ti,en-gpio-sleep", prop_array, ngpio);
  93         if (ret < 0) {
  94                 dev_dbg(dev, "ti,en-gpio-sleep not specified\n");
  95                 return tps65910_board;
  96         }
  97
  98         for (idx = 0; idx < ngpio; idx++)
  99                 tps65910_board->en_gpio_sleep[idx] = (prop_array[idx] != 0);
 100
 101         return tps65910_board;
 102 }
 103 #else
 104 static struct tps65910_board *tps65910_parse_dt_for_gpio(struct device *dev,
 105                 struct tps65910 *tps65910, int chip_ngpio)
 106 {
 107         return NULL;
 108 }
 109 #endif
 110
 111 static int tps65910_gpio_probe(struct platform_device *pdev)
 112 {
 113         struct tps65910 *tps65910 = dev_get_drvdata(pdev->dev.parent);
 114         struct tps65910_board *pdata = dev_get_platdata(tps65910->dev);
 115         struct tps65910_gpio *tps65910_gpio;
 116         int ret;
 117         int i;
 118
 119         tps65910_gpio = devm_kzalloc(&pdev->dev,
 120                                 sizeof(*tps65910_gpio), GFP_KERNEL);
 121         if (!tps65910_gpio)
 122                 return -ENOMEM;
 123
 124         tps65910_gpio->tps65910 = tps65910;
 125
 126         tps65910_gpio->gpio_chip.owner = THIS_MODULE;
 127         tps65910_gpio->gpio_chip.label = tps65910->i2c_client->name;
 128
 129         switch (tps65910_chip_id(tps65910)) {
 130         case TPS65910:
 131                 tps65910_gpio->gpio_chip.ngpio = TPS65910_NUM_GPIO;
 132                 break;
 133         case TPS65911:
 134                 tps65910_gpio->gpio_chip.ngpio = TPS65911_NUM_GPIO;
 135                 break;
 136         default:
 137                 return -EINVAL;
 138         }
 139         tps65910_gpio->gpio_chip.can_sleep = true;
 140         tps65910_gpio->gpio_chip.direction_input = tps65910_gpio_input;
 141         tps65910_gpio->gpio_chip.direction_output = tps65910_gpio_output;
 142         tps65910_gpio->gpio_chip.set    = tps65910_gpio_set;
 143         tps65910_gpio->gpio_chip.get    = tps65910_gpio_get;
 144         tps65910_gpio->gpio_chip.parent = &pdev->dev;
 145 #ifdef CONFIG_OF_GPIO
 146         tps65910_gpio->gpio_chip.of_node = tps65910->dev->of_node;
 147 #endif
 148         if (pdata && pdata->gpio_base)
 149                 tps65910_gpio->gpio_chip.base = pdata->gpio_base;
 150         else
 151                 tps65910_gpio->gpio_chip.base = -1;
 152
 153         if (!pdata && tps65910->dev->of_node)
 154                 pdata = tps65910_parse_dt_for_gpio(&pdev->dev, tps65910,
 155                         tps65910_gpio->gpio_chip.ngpio);
 156
 157         if (!pdata)
 158                 goto skip_init;
 159
 160         /* Configure sleep control for gpios if provided */
 161         for (i = 0; i < tps65910_gpio->gpio_chip.ngpio; ++i) {
 162                 if (!pdata->en_gpio_sleep[i])
 163                         continue;
 164
 165                 ret = tps65910_reg_set_bits(tps65910,
 166                         TPS65910_GPIO0 + i, GPIO_SLEEP_MASK);
 167                 if (ret < 0)
 168                         dev_warn(tps65910->dev,
 169                                 "GPIO Sleep setting failed with err %d\n", ret);
 170         }
 171
 172 skip_init:
 173         ret = devm_gpiochip_add_data(&pdev->dev, &tps65910_gpio->gpio_chip,
 174                                      tps65910_gpio);
 175         if (ret < 0) {
 176                 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
 177                 return ret;
 178         }
 179
 180         platform_set_drvdata(pdev, tps65910_gpio);
 181
 182         return ret;
 183 }
 184
 185 static struct platform_driver tps65910_gpio_driver = {
 186         .driver.name    = "tps65910-gpio",
 187         .driver.owner   = THIS_MODULE,
 188         .probe          = tps65910_gpio_probe,
 189 };
 190
 191 static int __init tps65910_gpio_init(void)
 192 {
 193         return platform_driver_register(&tps65910_gpio_driver);
 194 }
 195 subsys_initcall(tps65910_gpio_init);