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/* Copyright (c) 2016, The Linux Foundation. All rights reserved.
* Copyright (C) 2019 XiaoMi, Inc.
*
* 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/delay.h>
#include "spk-id.h"
struct spk_id_info {
struct pinctrl *pinctrl;
struct pinctrl_state *pull_down;
struct pinctrl_state *pull_up;
struct pinctrl_state *no_pull;
int gpio;
int state;
};
static struct spk_id_info *spk_id_get_info(struct device_node *np)
{
struct platform_device *pdev;
struct spk_id_info *info;
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;
}
info = dev_get_drvdata(&pdev->dev);
if (!info)
dev_err(&pdev->dev, "%s: cannot find spk id info\n", __func__);
return info;
}
int spk_id_get_pin_3state(struct device_node *np)
{
struct spk_id_info *info;
int pu = 0;
int pd = 0;
info = spk_id_get_info(np);
if (!info)
return -EINVAL;
if (IS_ERR_OR_NULL(info->pinctrl)) {
pr_err("%s: pin ctrl is invalid:%ld\n", __func__, PTR_ERR(info->pinctrl));
return -EINVAL;
}
if (!gpio_is_valid(info->gpio)) {
pr_err("%s: gpio is invalid:%d\n", __func__, info->gpio);
return -EINVAL;
}
pinctrl_select_state(info->pinctrl, info->pull_down);
msleep(3);
pd = gpio_get_value(info->gpio);
pinctrl_select_state(info->pinctrl, info->pull_up);
msleep(3);
pu = gpio_get_value(info->gpio);
if ((pd == pu) && (pd == 0)) {
pr_info("%s: id pin%d = %d\n", __func__, info->gpio, pd);
pinctrl_select_state(info->pinctrl, info->pull_down);
info->state = PIN_PULL_DOWN;
} else if ((pd == pu) && (pd == 1)) {
pr_info("%s: id pin%d = %d\n", __func__, info->gpio, pd);
pinctrl_select_state(info->pinctrl, info->pull_up);
info->state = PIN_PULL_UP;
} else {
pr_info("%s: id pin%d = 2\n", __func__, info->gpio);
pinctrl_select_state(info->pinctrl, info->no_pull);
info->state = PIN_FLOAT;
}
return info->state;
}
EXPORT_SYMBOL(spk_id_get_pin_3state);
static int spk_id_probe(struct platform_device *pdev)
{
int ret = 0;
struct spk_id_info *info;
info = devm_kzalloc(&pdev->dev,
sizeof(struct spk_id_info),
GFP_KERNEL);
if (!info)
return -ENOMEM;
dev_dbg(&pdev->dev, "%s: device %s\n", __func__, pdev->name);
info->pinctrl = devm_pinctrl_get(&pdev->dev);
if (IS_ERR_OR_NULL(info->pinctrl)) {
dev_err(&pdev->dev, "%s: Cannot get speaker id gpio pinctrl:%ld\n",
__func__, PTR_ERR(info->pinctrl));
ret = PTR_ERR(info->pinctrl);
goto err_pctrl_get;
}
info->pull_down = pinctrl_lookup_state(
info->pinctrl, "pull_down");
if (IS_ERR_OR_NULL(info->pull_down)) {
dev_err(&pdev->dev, "%s: Cannot get pull_down pinctrl state:%ld\n",
__func__, PTR_ERR(info->pull_down));
ret = PTR_ERR(info->pull_down);
goto err_lookup_state;
}
info->pull_up = pinctrl_lookup_state(
info->pinctrl, "pull_up");
if (IS_ERR_OR_NULL(info->pull_up)) {
dev_err(&pdev->dev, "%s: Cannot get pull_up pinctrl state:%ld\n",
__func__, PTR_ERR(info->pull_up));
ret = PTR_ERR(info->pull_up);
goto err_lookup_state;
}
info->no_pull = pinctrl_lookup_state(
info->pinctrl, "no_pull");
if (IS_ERR_OR_NULL(info->no_pull)) {
dev_err(&pdev->dev, "%s: Cannot get no_pull pinctrl state:%ld\n",
__func__, PTR_ERR(info->no_pull));
ret = PTR_ERR(info->no_pull);
goto err_lookup_state;
}
info->gpio = of_get_named_gpio(pdev->dev.of_node,
"audio,speaker-id-gpio", 0);
if (gpio_is_valid(info->gpio)) {
ret = gpio_request(info->gpio, "speaker-id");
if (ret) {
dev_err(&pdev->dev, "%s: Failed to request gpio %d\n",
__func__, info->gpio);
goto err_lookup_state;
}
}
dev_set_drvdata(&pdev->dev, info);
return 0;
err_lookup_state:
devm_pinctrl_put(info->pinctrl);
err_pctrl_get:
devm_kfree(&pdev->dev, info);
return ret;
}
static int spk_id_remove(struct platform_device *pdev)
{
struct spk_id_info *info;
info = dev_get_drvdata(&pdev->dev);
if (info) {
if (info->pinctrl)
devm_pinctrl_put(info->pinctrl);
if (gpio_is_valid(info->gpio))
gpio_free(info->gpio);
}
devm_kfree(&pdev->dev, info);
return 0;
}
static const struct of_device_id spk_id_match[] = {
{.compatible = "audio,speaker-id"},
{}
};
static struct platform_driver spk_id_driver = {
.driver = {
.name = "spk-id",
.owner = THIS_MODULE,
.of_match_table = spk_id_match,
},
.probe = spk_id_probe,
.remove = spk_id_remove,
};
//module_platform_driver(spk_id_driver);
static int __init spk_id_init(void)
{
return platform_driver_register(&spk_id_driver);
}
module_init(spk_id_init);
MODULE_DESCRIPTION("Speaker ID platform driver");
MODULE_LICENSE("GPL v2");
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