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/*
* Copyright 2016 Toradex AG
* Dominik Sliwa <dominik.sliwa@toradex.com>
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License version 2 as published by the
* Free Software Foundation.
*/
#include <linux/mfd/apalis-tk1-k20.h>
#include <linux/platform_device.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/gpio.h>
#include <linux/slab.h>
struct apalis_tk1_k20_gpio {
struct gpio_chip chip;
struct apalis_tk1_k20_regmap *apalis_tk1_k20;
};
static int apalis_tk1_k20_gpio_input(struct gpio_chip *chip, unsigned offset)
{
struct apalis_tk1_k20_gpio *gpio = container_of(chip,
struct apalis_tk1_k20_gpio, chip);
apalis_tk1_k20_lock(gpio->apalis_tk1_k20);
apalis_tk1_k20_reg_write(gpio->apalis_tk1_k20, APALIS_TK1_K20_GPIO_NO,
offset);
apalis_tk1_k20_reg_write(gpio->apalis_tk1_k20, APALIS_TK1_K20_GPIO_STA,
0);
apalis_tk1_k20_unlock(gpio->apalis_tk1_k20);
return 0;
}
static int apalis_tk1_k20_gpio_output(struct gpio_chip *chip, unsigned offset,
int value)
{
struct apalis_tk1_k20_gpio *gpio = container_of(chip,
struct apalis_tk1_k20_gpio, chip);
int status;
apalis_tk1_k20_lock(gpio->apalis_tk1_k20);
apalis_tk1_k20_reg_write(gpio->apalis_tk1_k20, APALIS_TK1_K20_GPIO_NO,
offset);
status = APALIS_TK1_K20_GPIO_STA_OE;
status += value ? APALIS_TK1_K20_GPIO_STA_VAL : 0;
apalis_tk1_k20_reg_write(gpio->apalis_tk1_k20, APALIS_TK1_K20_GPIO_STA,
status);
apalis_tk1_k20_unlock(gpio->apalis_tk1_k20);
return 0;
}
static int apalis_tk1_k20_gpio_get(struct gpio_chip *chip, unsigned offset)
{
struct apalis_tk1_k20_gpio *gpio = container_of(chip,
struct apalis_tk1_k20_gpio, chip);
int value;
apalis_tk1_k20_lock(gpio->apalis_tk1_k20);
apalis_tk1_k20_reg_write(gpio->apalis_tk1_k20, APALIS_TK1_K20_GPIO_NO,
offset);
if (apalis_tk1_k20_reg_read(gpio->apalis_tk1_k20,
APALIS_TK1_K20_GPIO_STA, &value) < 0) {
apalis_tk1_k20_unlock(gpio->apalis_tk1_k20);
return -ENODEV;
}
value &= APALIS_TK1_K20_GPIO_STA_VAL;
apalis_tk1_k20_unlock(gpio->apalis_tk1_k20);
return value ? 1 : 0;
}
static int apalis_tk1_k20_gpio_request(struct gpio_chip *chip, unsigned offset)
{
struct apalis_tk1_k20_gpio *gpio = container_of(chip,
struct apalis_tk1_k20_gpio, chip);
int status = 0;
pr_debug("APALIS TK1 K20 GPIO %s\n", __func__);
apalis_tk1_k20_lock(gpio->apalis_tk1_k20);
apalis_tk1_k20_reg_write(gpio->apalis_tk1_k20, APALIS_TK1_K20_GPIO_NO,
offset);
if (apalis_tk1_k20_reg_read(gpio->apalis_tk1_k20,
APALIS_TK1_K20_GPIO_NO, &status) < 0) {
apalis_tk1_k20_unlock(gpio->apalis_tk1_k20);
return -ENODEV;
}
apalis_tk1_k20_unlock(gpio->apalis_tk1_k20);
return status;
}
static void apalis_tk1_k20_gpio_free(struct gpio_chip *chip, unsigned offset)
{
struct apalis_tk1_k20_gpio *gpio = container_of(chip,
struct apalis_tk1_k20_gpio, chip);
apalis_tk1_k20_lock(gpio->apalis_tk1_k20);
apalis_tk1_k20_reg_write(gpio->apalis_tk1_k20, APALIS_TK1_K20_GPIO_NO,
offset);
apalis_tk1_k20_reg_write(gpio->apalis_tk1_k20,
APALIS_TK1_K20_GPIO_STA, 0);
apalis_tk1_k20_unlock(gpio->apalis_tk1_k20);
}
static void apalis_tk1_k20_gpio_set(struct gpio_chip *chip, unsigned offset,
int value)
{
struct apalis_tk1_k20_gpio *gpio = container_of(chip,
struct apalis_tk1_k20_gpio, chip);
int status;
apalis_tk1_k20_lock(gpio->apalis_tk1_k20);
apalis_tk1_k20_reg_write(gpio->apalis_tk1_k20, APALIS_TK1_K20_GPIO_NO,
offset);
if (apalis_tk1_k20_reg_read(gpio->apalis_tk1_k20,
APALIS_TK1_K20_GPIO_STA, &status) < 0) {
apalis_tk1_k20_unlock(gpio->apalis_tk1_k20);
return;
}
status &= ~APALIS_TK1_K20_GPIO_STA_VAL;
status += value ? APALIS_TK1_K20_GPIO_STA_VAL : 0;
apalis_tk1_k20_reg_write(gpio->apalis_tk1_k20, APALIS_TK1_K20_GPIO_STA,
status);
apalis_tk1_k20_unlock(gpio->apalis_tk1_k20);
}
static int __init apalis_tk1_k20_gpio_probe(struct platform_device *pdev)
{
struct apalis_tk1_k20_gpio *priv;
struct apalis_tk1_k20_regmap *apalis_tk1_k20;
int status;
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
apalis_tk1_k20 = dev_get_drvdata(pdev->dev.parent);
if (!apalis_tk1_k20)
return -ENODEV;
priv->apalis_tk1_k20 = apalis_tk1_k20;
platform_set_drvdata(pdev, priv);
apalis_tk1_k20_lock(apalis_tk1_k20);
/* TBD: some code */
apalis_tk1_k20_unlock(apalis_tk1_k20);
priv->chip.base = -1;
priv->chip.can_sleep = 1;
priv->chip.dev = &pdev->dev;
priv->chip.owner = THIS_MODULE;
priv->chip.get = apalis_tk1_k20_gpio_get;
priv->chip.set = apalis_tk1_k20_gpio_set;
priv->chip.direction_input = apalis_tk1_k20_gpio_input;
priv->chip.direction_output = apalis_tk1_k20_gpio_output;
priv->chip.request = apalis_tk1_k20_gpio_request;
priv->chip.free = apalis_tk1_k20_gpio_free;
/* TODO: include as a define somewhere */
priv->chip.ngpio = 160;
status = gpiochip_add(&priv->chip);
return status;
}
static int __exit apalis_tk1_k20_gpio_remove(struct platform_device *pdev)
{
struct apalis_tk1_k20_gpio *priv = platform_get_drvdata(pdev);
return gpiochip_remove(&priv->chip);
}
static const struct platform_device_id apalis_tk1_k20_gpio_idtable[] = {
{
.name = "apalis-tk1-k20-gpio",
},
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, apalis_tk1_k20_gpio_idtable);
static struct platform_driver apalis_tk1_k20_gpio_driver = {
.id_table = apalis_tk1_k20_gpio_idtable,
.remove = __exit_p(apalis_tk1_k20_gpio_remove),
.driver = {
.name = "apalis-tk1-k20-gpio",
.owner = THIS_MODULE,
},
};
module_platform_driver_probe(apalis_tk1_k20_gpio_driver,
&apalis_tk1_k20_gpio_probe);
MODULE_DESCRIPTION("GPIO driver for K20 MCU on Apalis TK1");
MODULE_AUTHOR("Dominik Sliwa <dominik.sliwa@toradex.com>");
MODULE_LICENSE("GPL v2");
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