mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 09:19:51 +00:00
164 lines
4.2 KiB
C
164 lines
4.2 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 inline struct arizona_gpio *to_arizona_gpio(struct gpio_chip *chip)
|
||
|
{
|
||
|
return container_of(chip, struct arizona_gpio, gpio_chip);
|
||
|
}
|
||
|
|
||
|
static int arizona_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
|
||
|
{
|
||
|
struct arizona_gpio *arizona_gpio = to_arizona_gpio(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 = to_arizona_gpio(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 = to_arizona_gpio(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 = to_arizona_gpio(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 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 = 1,
|
||
|
};
|
||
|
|
||
|
static int __devinit arizona_gpio_probe(struct platform_device *pdev)
|
||
|
{
|
||
|
struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
|
||
|
struct arizona_pdata *pdata = arizona->dev->platform_data;
|
||
|
struct arizona_gpio *arizona_gpio;
|
||
|
int ret;
|
||
|
|
||
|
arizona_gpio = devm_kzalloc(&pdev->dev, sizeof(*arizona_gpio),
|
||
|
GFP_KERNEL);
|
||
|
if (arizona_gpio == NULL)
|
||
|
return -ENOMEM;
|
||
|
|
||
|
arizona_gpio->arizona = arizona;
|
||
|
arizona_gpio->gpio_chip = template_chip;
|
||
|
arizona_gpio->gpio_chip.dev = &pdev->dev;
|
||
|
|
||
|
switch (arizona->type) {
|
||
|
case WM5102:
|
||
|
case WM5110:
|
||
|
arizona_gpio->gpio_chip.ngpio = 5;
|
||
|
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 = gpiochip_add(&arizona_gpio->gpio_chip);
|
||
|
if (ret < 0) {
|
||
|
dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
|
||
|
ret);
|
||
|
goto err;
|
||
|
}
|
||
|
|
||
|
platform_set_drvdata(pdev, arizona_gpio);
|
||
|
|
||
|
return ret;
|
||
|
|
||
|
err:
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
static int __devexit arizona_gpio_remove(struct platform_device *pdev)
|
||
|
{
|
||
|
struct arizona_gpio *arizona_gpio = platform_get_drvdata(pdev);
|
||
|
|
||
|
return gpiochip_remove(&arizona_gpio->gpio_chip);
|
||
|
}
|
||
|
|
||
|
static struct platform_driver arizona_gpio_driver = {
|
||
|
.driver.name = "arizona-gpio",
|
||
|
.driver.owner = THIS_MODULE,
|
||
|
.probe = arizona_gpio_probe,
|
||
|
.remove = __devexit_p(arizona_gpio_remove),
|
||
|
};
|
||
|
|
||
|
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");
|