LXR linux/drivers/gpio/gpio-tps65912.c

   1/*
   2 * GPIO driver for TI TPS65912x PMICs
   3 *
   4 * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
   5 *      Andrew F. Davis <afd@ti.com>
   6 *
   7 * This program is free software; you can redistribute it and/or
   8 * modify it under the terms of the GNU General Public License version 2 as
   9 * published by the Free Software Foundation.
  10 *
  11 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  12 * kind, whether expressed or implied; without even the implied warranty
  13 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License version 2 for more details.
  15 *
  16 * Based on the Arizona GPIO driver and the previous TPS65912 driver by
  17 * Margarita Olaya Cabrera <magi@slimlogic.co.uk>
  18 */
  19
  20#include <linux/gpio.h>
  21#include <linux/module.h>
  22#include <linux/platform_device.h>
  23
  24#include <linux/mfd/tps65912.h>
  25
  26struct tps65912_gpio {
  27        struct gpio_chip gpio_chip;
  28        struct tps65912 *tps;
  29};
  30
  31static int tps65912_gpio_get_direction(struct gpio_chip *gc,
  32                                       unsigned offset)
  33{
  34        struct tps65912_gpio *gpio = gpiochip_get_data(gc);
  35
  36        int ret, val;
  37
  38        ret = regmap_read(gpio->tps->regmap, TPS65912_GPIO1 + offset, &val);
  39        if (ret)
  40                return ret;
  41
  42        if (val & GPIO_CFG_MASK)
  43                return GPIOF_DIR_OUT;
  44        else
  45                return GPIOF_DIR_IN;
  46}
  47
  48static int tps65912_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
  49{
  50        struct tps65912_gpio *gpio = gpiochip_get_data(gc);
  51
  52        return regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
  53                                  GPIO_CFG_MASK, 0);
  54}
  55
  56static int tps65912_gpio_direction_output(struct gpio_chip *gc,
  57                                          unsigned offset, int value)
  58{
  59        struct tps65912_gpio *gpio = gpiochip_get_data(gc);
  60
  61        /* Set the initial value */
  62        regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
  63                           GPIO_SET_MASK, value ? GPIO_SET_MASK : 0);
  64
  65        return regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
  66                                  GPIO_CFG_MASK, GPIO_CFG_MASK);
  67}
  68
  69static int tps65912_gpio_get(struct gpio_chip *gc, unsigned offset)
  70{
  71        struct tps65912_gpio *gpio = gpiochip_get_data(gc);
  72        int ret, val;
  73
  74        ret = regmap_read(gpio->tps->regmap, TPS65912_GPIO1 + offset, &val);
  75        if (ret)
  76                return ret;
  77
  78        if (val & GPIO_STS_MASK)
  79                return 1;
  80
  81        return 0;
  82}
  83
  84static void tps65912_gpio_set(struct gpio_chip *gc, unsigned offset,
  85                              int value)
  86{
  87        struct tps65912_gpio *gpio = gpiochip_get_data(gc);
  88
  89        regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
  90                           GPIO_SET_MASK, value ? GPIO_SET_MASK : 0);
  91}
  92
  93static const struct gpio_chip template_chip = {
  94        .label                  = "tps65912-gpio",
  95        .owner                  = THIS_MODULE,
  96        .get_direction          = tps65912_gpio_get_direction,
  97        .direction_input        = tps65912_gpio_direction_input,
  98        .direction_output       = tps65912_gpio_direction_output,
  99        .get                    = tps65912_gpio_get,
 100        .set                    = tps65912_gpio_set,
 101        .base                   = -1,
 102        .ngpio                  = 5,
 103        .can_sleep              = true,
 104};
 105
 106static int tps65912_gpio_probe(struct platform_device *pdev)
 107{
 108        struct tps65912 *tps = dev_get_drvdata(pdev->dev.parent);
 109        struct tps65912_gpio *gpio;
 110        int ret;
 111
 112        gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
 113        if (!gpio)
 114                return -ENOMEM;
 115
 116        gpio->tps = dev_get_drvdata(pdev->dev.parent);
 117        gpio->gpio_chip = template_chip;
 118        gpio->gpio_chip.parent = tps->dev;
 119
 120        ret = devm_gpiochip_add_data(&pdev->dev, &gpio->gpio_chip,
 121                                     gpio);
 122        if (ret < 0) {
 123                dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
 124                return ret;
 125        }
 126
 127        platform_set_drvdata(pdev, gpio);
 128
 129        return 0;
 130}
 131
 132static const struct platform_device_id tps65912_gpio_id_table[] = {
 133        { "tps65912-gpio", },
 134        { /* sentinel */ }
 135};
 136MODULE_DEVICE_TABLE(platform, tps65912_gpio_id_table);
 137
 138static struct platform_driver tps65912_gpio_driver = {
 139        .driver = {
 140                .name = "tps65912-gpio",
 141        },
 142        .probe = tps65912_gpio_probe,
 143        .id_table = tps65912_gpio_id_table,
 144};
 145module_platform_driver(tps65912_gpio_driver);
 146
 147MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
 148MODULE_DESCRIPTION("TPS65912 GPIO driver");
 149MODULE_LICENSE("GPL v2");
 150