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#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/usbplugevent.h>
#include <linux/delay.h>
#include <linux/io.h>
#define GDEBUG 0
#include <linux/gallen_dbg.h>
#include "../../../arch/arm/mach-mx6/crm_regs.h"
#include <mach/arc_otg.h>
#define SINGLE_SHOT_TIME (6*1000) //in ms
//#define MXC_CCM_CCGR2 0xF7ED4070 // remapped IO addr for CCGR2 reg
//#define USB_PHY_CTR_FUNC 0xF7E80808 // remapped IO addr for USB_PHY_CTR reg
struct usb_plug_priv {
struct device *ddev;
int (*get_status) (void);
};
static struct usb_plug_priv *mxc_usbplug;
extern void set_pmic_dc_charger_state(int dccharger);
static void usb_plug_handler(void *dummy)
{
int plugged;
GALLEN_DBGLOCAL_BEGIN();
if(0==mxc_usbplug) {
printk(KERN_ERR "%s(%d):skip %s() when mxc_usbplug not exist !\n",
__FILE__,__LINE__,__FUNCTION__);
return ;
}
if(0==mxc_usbplug->ddev) {
printk(KERN_ERR "%s(%d):skip %s() when mxc_usbplug->ddev not exist !\n",
__FILE__,__LINE__,__FUNCTION__);
return ;
}
plugged = mxc_usbplug->get_status();
if (plugged) {
int charger;
int ret;
//volatile unsigned long *ccm_ccgr2 = (unsigned long*)(MXC_CCM_CCGR2);
//volatile unsigned long *usb_phy = (unsigned long*)(USB_PHY_CTR_FUNC);
unsigned long old_ccgr2;
unsigned long old_usbphy;
u32 dwTemp;
GALLEN_DBGLOCAL_RUNLOG(0);
#if 0 //[
/* query the i.MX to test for D+/D- charger detection */
//old_ccgr2 = *ccm_ccgr2;
old_ccgr2 = __raw_readl(MXC_CCM_CCGR2);
// *ccm_ccgr2 = (old_ccgr2 | 0x0C000000); /* enable usbotg clocks temporarily */
dwTemp = (old_ccgr2 | 0x0C000000);
__raw_writel(dwTemp,MXC_CCM_CCGR2);
mdelay(100);
//old_usbphy = *usb_phy;
old_usbphy = __raw_readl(USB_PHY_CTR_FUNC);
// *usb_phy = (old_usbphy | 0x01800000); /* enable charge detection circuit */
dwTemp = (old_usbphy | 0x01800000); /* enable charge detection circuit */
__raw_writel(dwTemp,USB_PHY_CTR_FUNC);
mdelay(100);
//charger = (int)(*usb_phy & (0x00000004)); /* bit 2 = charger detection */
charger = (int)(old_usbphy & (0x00000004)); /* bit 2 = charger detection */
/* restore old vals */
// *usb_phy = old_usbphy;
__raw_writel(old_usbphy,USB_PHY_CTR_FUNC);
// *ccm_ccgr2 = old_ccgr2;
__raw_writel(old_ccgr2,MXC_CCM_CCGR2);
#else//][
if (1 < plugged) {
// for PMIC support usb charger detect function.
charger=1;
}
else
charger=0;
#endif //]
if (charger) {
GALLEN_DBGLOCAL_RUNLOG(1);
set_pmic_dc_charger_state(1);
ret = kobject_rename(&mxc_usbplug->ddev->kobj, "usb_plug");
} else {
GALLEN_DBGLOCAL_RUNLOG(2);
ret = kobject_rename(&mxc_usbplug->ddev->kobj, "usb_host");
}
pr_info("usb plugged %d-%d\n", plugged, charger);
kobject_uevent(&mxc_usbplug->ddev->kobj, KOBJ_ADD);
} else {
GALLEN_DBGLOCAL_RUNLOG(3);
kobject_uevent(&mxc_usbplug->ddev->kobj, KOBJ_REMOVE);
kobject_set_name(&mxc_usbplug->ddev->kobj, "%s", "usb_state");
set_pmic_dc_charger_state(0);
pr_info("usb unplugged\n");
}
GALLEN_DBGLOCAL_END();
}
static void single_shot_worker(struct work_struct *work)
{
GALLEN_DBGLOCAL_BEGIN();
usb_plug_handler(NULL);
GALLEN_DBGLOCAL_END();
}
static DECLARE_DELAYED_WORK(single_shot_work, single_shot_worker);
static int __devinit usb_plug_probe(struct platform_device *pdev)
{
int ret;
struct usbplug_event_platform_data *pdata = pdev->dev.platform_data;
GALLEN_DBGLOCAL_BEGIN();
mxc_usbplug = kzalloc(sizeof(struct usb_plug_priv), GFP_KERNEL);
if (!mxc_usbplug) {
GALLEN_DBGLOCAL_RUNLOG(0);
dev_err(&pdev->dev, "Error: kzalloc\n");
ret = -ENOMEM;
goto err_allocate;
}
mxc_usbplug->ddev = &pdev->dev;
kobject_set_name(&mxc_usbplug->ddev->kobj, "%s", "usb_state");
mxc_usbplug->get_status = pdata->get_key_status;
pdata->register_usbplugevent(usb_plug_handler);
schedule_delayed_work(&single_shot_work,
msecs_to_jiffies(SINGLE_SHOT_TIME));
GALLEN_DBGLOCAL_END();
return 0;
err_allocate:
return ret;
}
static int __devexit usb_plug_remove(struct platform_device *pdev)
{
GALLEN_DBGLOCAL_BEGIN();
cancel_delayed_work_sync(&single_shot_work);
kfree(mxc_usbplug);
GALLEN_DBGLOCAL_END();
return 0;
}
static struct platform_driver usb_plug_driver = {
.probe = usb_plug_probe,
.remove = __devexit_p(usb_plug_remove),
.driver = {
.name = "usb_plug",
.owner = THIS_MODULE,
},
};
static int __init usb_plug_init(void)
{
return platform_driver_register(&usb_plug_driver);
}
module_init(usb_plug_init);
static void __exit usb_plug_exit(void)
{
platform_driver_unregister(&usb_plug_driver);
}
module_exit(usb_plug_exit);
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