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/* Copyright (c) 2016, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/of_gpio.h>
#include <linux/mfd/wcd9xxx/wcd-gpio-ctrl.h>
struct wcd_gpio_pinctrl_info {
struct pinctrl *pinctrl;
struct pinctrl_state *pinctrl_active;
struct pinctrl_state *pinctrl_sleep;
};
static struct wcd_gpio_pinctrl_info *wcd_gpio_get_gpiodata(
struct device_node *np)
{
struct platform_device *pdev;
struct wcd_gpio_pinctrl_info *gpio_data;
if (!np) {
pr_err("%s: device node is null\n", __func__);
return NULL;
}
pdev = of_find_device_by_node(np);
if (!pdev) {
pr_err("%s: platform device not found!\n", __func__);
return NULL;
}
gpio_data = dev_get_drvdata(&pdev->dev);
if (!gpio_data)
dev_err(&pdev->dev, "%s: cannot find cdc gpio info\n",
__func__);
return gpio_data;
}
/*
* wcd_gpio_ctrl_select_sleep_state: select pinctrl sleep state
* @np: pointer to struct device_node
*
* Returns error code for failure
*/
int wcd_gpio_ctrl_select_sleep_state(struct device_node *np)
{
struct wcd_gpio_pinctrl_info *gpio_data;
gpio_data = wcd_gpio_get_gpiodata(np);
if (!gpio_data)
return -EINVAL;
if (!gpio_data->pinctrl_sleep) {
pr_err("%s: pinctrl sleep state is null\n", __func__);
return -EINVAL;
}
return pinctrl_select_state(gpio_data->pinctrl,
gpio_data->pinctrl_sleep);
}
EXPORT_SYMBOL(wcd_gpio_ctrl_select_sleep_state);
/*
* wcd_gpio_ctrl_select_active_state: select pinctrl active state
* @np: pointer to struct device_node
*
* Returns error code for failure
*/
int wcd_gpio_ctrl_select_active_state(struct device_node *np)
{
struct wcd_gpio_pinctrl_info *gpio_data;
gpio_data = wcd_gpio_get_gpiodata(np);
if (!gpio_data)
return -EINVAL;
if (!gpio_data->pinctrl_active) {
pr_err("%s: pinctrl active state is null\n", __func__);
return -EINVAL;
}
return pinctrl_select_state(gpio_data->pinctrl,
gpio_data->pinctrl_active);
}
EXPORT_SYMBOL(wcd_gpio_ctrl_select_active_state);
static int wcd_gpio_ctrl_probe(struct platform_device *pdev)
{
int ret = 0;
struct wcd_gpio_pinctrl_info *gpio_data;
gpio_data = devm_kzalloc(&pdev->dev,
sizeof(struct wcd_gpio_pinctrl_info),
GFP_KERNEL);
if (!gpio_data)
return -ENOMEM;
gpio_data->pinctrl = devm_pinctrl_get(&pdev->dev);
if (IS_ERR_OR_NULL(gpio_data->pinctrl)) {
dev_err(&pdev->dev, "%s: Cannot get cdc gpio pinctrl:%ld\n",
__func__, PTR_ERR(gpio_data->pinctrl));
ret = PTR_ERR(gpio_data->pinctrl);
goto err_pctrl_get;
}
gpio_data->pinctrl_active = pinctrl_lookup_state(
gpio_data->pinctrl, "aud_active");
if (IS_ERR_OR_NULL(gpio_data->pinctrl_active)) {
dev_err(&pdev->dev, "%s: Cannot get aud_active pinctrl state:%ld\n",
__func__, PTR_ERR(gpio_data->pinctrl_active));
ret = PTR_ERR(gpio_data->pinctrl_active);
goto err_lookup_state;
}
gpio_data->pinctrl_sleep = pinctrl_lookup_state(
gpio_data->pinctrl, "aud_sleep");
if (IS_ERR_OR_NULL(gpio_data->pinctrl_sleep)) {
dev_err(&pdev->dev, "%s: Cannot get aud_sleep pinctrl state:%ld\n",
__func__, PTR_ERR(gpio_data->pinctrl_sleep));
ret = PTR_ERR(gpio_data->pinctrl_sleep);
goto err_lookup_state;
}
/* Set pinctrl state to aud_sleep by default */
ret = pinctrl_select_state(gpio_data->pinctrl,
gpio_data->pinctrl_sleep);
if (ret)
dev_err(&pdev->dev, "%s: set cdc gpio sleep state fail: %d\n",
__func__, ret);
dev_set_drvdata(&pdev->dev, gpio_data);
return 0;
err_lookup_state:
devm_pinctrl_put(gpio_data->pinctrl);
err_pctrl_get:
devm_kfree(&pdev->dev, gpio_data);
return ret;
}
static int wcd_gpio_ctrl_remove(struct platform_device *pdev)
{
struct wcd_gpio_pinctrl_info *gpio_data;
gpio_data = dev_get_drvdata(&pdev->dev);
if (gpio_data && gpio_data->pinctrl)
devm_pinctrl_put(gpio_data->pinctrl);
devm_kfree(&pdev->dev, gpio_data);
return 0;
}
static const struct of_device_id wcd_gpio_ctrl_match[] = {
{.compatible = "qcom,wcd-gpio-ctrl"},
{}
};
static struct platform_driver wcd_gpio_ctrl_driver = {
.driver = {
.name = "wcd-gpio-ctrl",
.owner = THIS_MODULE,
.of_match_table = wcd_gpio_ctrl_match,
},
.probe = wcd_gpio_ctrl_probe,
.remove = wcd_gpio_ctrl_remove,
};
module_platform_driver(wcd_gpio_ctrl_driver);
MODULE_DESCRIPTION("WCD GPIO Control module platform driver");
MODULE_LICENSE("GPL v2");
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