157 строки
4.0 KiB
C
157 строки
4.0 KiB
C
/*
|
|
* gpiolib support for Wolfson Arizona class devices
|
|
*
|
|
* Copyright 2012 Wolfson Microelectronics PLC.
|
|
*
|
|
* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation; either version 2 of the License, or (at your
|
|
* option) any later version.
|
|
*
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/module.h>
|
|
#include <linux/gpio.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/seq_file.h>
|
|
|
|
#include <linux/mfd/arizona/core.h>
|
|
#include <linux/mfd/arizona/pdata.h>
|
|
#include <linux/mfd/arizona/registers.h>
|
|
|
|
struct arizona_gpio {
|
|
struct arizona *arizona;
|
|
struct gpio_chip gpio_chip;
|
|
};
|
|
|
|
static int arizona_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
|
|
{
|
|
struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip);
|
|
struct arizona *arizona = arizona_gpio->arizona;
|
|
|
|
return regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset,
|
|
ARIZONA_GPN_DIR, ARIZONA_GPN_DIR);
|
|
}
|
|
|
|
static int arizona_gpio_get(struct gpio_chip *chip, unsigned offset)
|
|
{
|
|
struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip);
|
|
struct arizona *arizona = arizona_gpio->arizona;
|
|
unsigned int val;
|
|
int ret;
|
|
|
|
ret = regmap_read(arizona->regmap, ARIZONA_GPIO1_CTRL + offset, &val);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (val & ARIZONA_GPN_LVL)
|
|
return 1;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
static int arizona_gpio_direction_out(struct gpio_chip *chip,
|
|
unsigned offset, int value)
|
|
{
|
|
struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip);
|
|
struct arizona *arizona = arizona_gpio->arizona;
|
|
|
|
if (value)
|
|
value = ARIZONA_GPN_LVL;
|
|
|
|
return regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset,
|
|
ARIZONA_GPN_DIR | ARIZONA_GPN_LVL, value);
|
|
}
|
|
|
|
static void arizona_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
|
|
{
|
|
struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip);
|
|
struct arizona *arizona = arizona_gpio->arizona;
|
|
|
|
if (value)
|
|
value = ARIZONA_GPN_LVL;
|
|
|
|
regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset,
|
|
ARIZONA_GPN_LVL, value);
|
|
}
|
|
|
|
static const struct gpio_chip template_chip = {
|
|
.label = "arizona",
|
|
.owner = THIS_MODULE,
|
|
.direction_input = arizona_gpio_direction_in,
|
|
.get = arizona_gpio_get,
|
|
.direction_output = arizona_gpio_direction_out,
|
|
.set = arizona_gpio_set,
|
|
.can_sleep = true,
|
|
};
|
|
|
|
static int arizona_gpio_probe(struct platform_device *pdev)
|
|
{
|
|
struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
|
|
struct arizona_pdata *pdata = dev_get_platdata(arizona->dev);
|
|
struct arizona_gpio *arizona_gpio;
|
|
int ret;
|
|
|
|
arizona_gpio = devm_kzalloc(&pdev->dev, sizeof(*arizona_gpio),
|
|
GFP_KERNEL);
|
|
if (!arizona_gpio)
|
|
return -ENOMEM;
|
|
|
|
arizona_gpio->arizona = arizona;
|
|
arizona_gpio->gpio_chip = template_chip;
|
|
arizona_gpio->gpio_chip.parent = &pdev->dev;
|
|
#ifdef CONFIG_OF_GPIO
|
|
arizona_gpio->gpio_chip.of_node = arizona->dev->of_node;
|
|
#endif
|
|
|
|
switch (arizona->type) {
|
|
case WM5102:
|
|
case WM5110:
|
|
case WM8280:
|
|
case WM8997:
|
|
case WM8998:
|
|
case WM1814:
|
|
arizona_gpio->gpio_chip.ngpio = 5;
|
|
break;
|
|
case WM1831:
|
|
case CS47L24:
|
|
arizona_gpio->gpio_chip.ngpio = 2;
|
|
break;
|
|
default:
|
|
dev_err(&pdev->dev, "Unknown chip variant %d\n",
|
|
arizona->type);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (pdata && pdata->gpio_base)
|
|
arizona_gpio->gpio_chip.base = pdata->gpio_base;
|
|
else
|
|
arizona_gpio->gpio_chip.base = -1;
|
|
|
|
ret = devm_gpiochip_add_data(&pdev->dev, &arizona_gpio->gpio_chip,
|
|
arizona_gpio);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
|
|
ret);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver arizona_gpio_driver = {
|
|
.driver.name = "arizona-gpio",
|
|
.probe = arizona_gpio_probe,
|
|
};
|
|
|
|
module_platform_driver(arizona_gpio_driver);
|
|
|
|
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
|
|
MODULE_DESCRIPTION("GPIO interface for Arizona devices");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:arizona-gpio");
|