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/*
* earjack debugger trigger
*
* Copyright (C) 2012 LGE, Inc.
*
* 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.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <linux/kernel.h>
#include <linux/printk.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/gpio.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/of_gpio.h>
#include <mach/gpiomux.h>
#include <mach/board_lge.h>
struct earjack_debugger_device {
int gpio;
int irq;
int saved_detect;
int (*set_uart_console)(int enable);
};
struct earjack_debugger_platform_data {
int gpio_trigger;
};
extern int msm_serial_set_uart_console(int enable);
static int earjack_debugger_detected(void *dev)
{
//[START] VU3 detects earjack debugger even though it doesn't have it. When it's detected, it starts showing UART log and this logging makes device performance low. gunmin.lee@lge.com 2013/07/15
#if defined (CONFIG_MACH_MSM8974_VU3_KR) || defined (CONFIG_MACH_MSM8974_Z_US) || defined(CONFIG_MACH_MSM8974_Z_CA)
printk("earjack debugger is detected on VU3 but do not allow to use it!");
return 0;
#else
struct earjack_debugger_device *adev = dev;
return !!gpio_get_value(adev->gpio);
#endif
//[END] VU3 detects earjack debugger even though it doesn't have it. When it's detected, it starts showing UART log and this logging makes device performance low. gunmin.lee@lge.com 2013/07/15
}
static irqreturn_t earjack_debugger_irq_handler(int irq, void *_dev)
{
struct earjack_debugger_device *adev = _dev;
unsigned int um = lge_get_uart_mode();
int detect;
/* LGE_CHANGE_S
* add debounce time because accure earjack popup noise
* sangwoo2.park@lge.com 2012/12/20
*/
msleep(400);
/* LGE_CHANGE_E */
detect = earjack_debugger_detected(adev);
if (detect) {
pr_debug("%s() : in!!\n", __func__);
if (um & UART_MODE_INIT_BMSK) {
adev->set_uart_console(1);
} else {
lge_set_uart_mode(um | UART_MODE_EN_BMSK);
}
} else {
pr_debug("%s() : out!!\n", __func__);
if (um & UART_MODE_INIT_BMSK) {
adev->set_uart_console(0);
} else {
lge_set_uart_mode(um & ~UART_MODE_EN_BMSK);
}
}
return IRQ_HANDLED;
}
static void earjack_debugger_parse_dt(struct device *dev,
struct earjack_debugger_platform_data *pdata)
{
struct device_node *np = dev->of_node;
pdata->gpio_trigger = of_get_named_gpio_flags(np, "serial,irq-gpio", 0, NULL);
}
static int __devinit earjack_debugger_probe(struct platform_device *pdev)
{
int ret = 0;
struct earjack_debugger_device *adev;
struct earjack_debugger_platform_data *pdata;
unsigned int um = 0;
if (pdev->dev.of_node) {
pdata = devm_kzalloc(&pdev->dev,
sizeof(struct earjack_debugger_platform_data),
GFP_KERNEL);
if (pdata == NULL) {
pr_err("%s: no pdata\n", __func__);
return -ENOMEM;
}
pdev->dev.platform_data = pdata;
earjack_debugger_parse_dt(&pdev->dev, pdata);
} else {
pdata = pdev->dev.platform_data;
}
if (!pdata) {
pr_err("%s: no pdata\n", __func__);
return -ENOMEM;
}
adev = kzalloc(sizeof(struct earjack_debugger_device), GFP_KERNEL);
if (!adev) {
pr_err("%s: no memory\n", __func__);
return -ENOMEM;
}
adev->gpio = pdata->gpio_trigger;
adev->irq = gpio_to_irq(pdata->gpio_trigger);
adev->set_uart_console = msm_serial_set_uart_console;
platform_set_drvdata(pdev, adev);
ret = gpio_request_one(adev->gpio, GPIOF_IN,
"gpio_earjack_debugger");
if (ret < 0) {
pr_err("%s: failed to request gpio %d\n", __func__,
adev->gpio);
goto err_gpio_request;
}
ret = request_threaded_irq(adev->irq, NULL, earjack_debugger_irq_handler,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
"earjack_debugger_trigger", adev);
if (ret < 0) {
pr_err("%s: failed to request irq\n", __func__);
goto err_request_irq;
}
um = lge_get_uart_mode();
if (earjack_debugger_detected(adev))
adev->set_uart_console(1);
pr_info("earjack debugger probed\n");
return ret;
err_request_irq:
gpio_free(adev->gpio);
err_gpio_request:
kfree(adev);
return ret;
}
static int __devexit earjack_debugger_remove(struct platform_device *pdev)
{
struct earjack_debugger_device *adev = platform_get_drvdata(pdev);
free_irq(adev->irq, adev);
gpio_free(adev->gpio);
kfree(adev);
return 0;
}
static void earjack_debugger_shutdown(struct platform_device *pdev)
{
struct earjack_debugger_device *adev = platform_get_drvdata(pdev);
disable_irq(adev->irq);
}
static int earjack_debugger_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct earjack_debugger_device *adev = platform_get_drvdata(pdev);
disable_irq(adev->irq);
return 0;
}
static int earjack_debugger_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct earjack_debugger_device *adev = platform_get_drvdata(pdev);
enable_irq(adev->irq);
return 0;
}
static const struct dev_pm_ops earjack_debugger_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(earjack_debugger_suspend,
earjack_debugger_resume)
};
#ifdef CONFIG_OF
static struct of_device_id earjack_debugger_match_table[] = {
{ .compatible = "serial,earjack-debugger", },
{ },
};
#endif
static struct platform_driver earjack_debugger_driver = {
.probe = earjack_debugger_probe,
.remove = __devexit_p(earjack_debugger_remove),
.shutdown = earjack_debugger_shutdown,
.driver = {
.name = "earjack-debugger",
.pm = &earjack_debugger_pm_ops,
#ifdef CONFIG_OF
.of_match_table = earjack_debugger_match_table,
#endif
},
};
static int __init earjack_debugger_init(void)
{
if (lge_get_uart_mode() &
(UART_MODE_ALWAYS_ON_BMSK | UART_MODE_ALWAYS_OFF_BMSK))
return -ENODEV;
return platform_driver_register(&earjack_debugger_driver);
}
static void __exit earjack_debugger_exit(void)
{
platform_driver_unregister(&earjack_debugger_driver);
}
module_init(earjack_debugger_init);
module_exit(earjack_debugger_exit);
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