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/*
* Copyright (C) 2011-2012 Freescale Semiconductor, Inc. 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 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <linux/sched.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/slab.h>
#include <linux/kthread.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/fsl_devices.h>
#include <linux/suspend.h>
#include <linux/io.h>
#include <mach/arc_otg.h>
struct wakeup_ctrl {
int wakeup_irq;
int usb_irq;
struct fsl_usb2_wakeup_platform_data *pdata;
struct task_struct *thread;
struct completion event;
};
static struct wakeup_ctrl *g_ctrl;
extern int usb_event_is_otg_wakeup(struct fsl_usb2_platform_data *pdata);
extern void usb_debounce_id_vbus(void);
static void wakeup_clk_gate(struct fsl_usb2_wakeup_platform_data *pdata, bool on)
{
if (pdata->usb_clock_for_pm)
pdata->usb_clock_for_pm(on);
}
static bool usb2_is_in_lowpower(struct wakeup_ctrl *ctrl)
{
int i;
struct fsl_usb2_wakeup_platform_data *pdata = ctrl->pdata;
/* all the usb module related the wakeup is in lowpower mode */
for (i = 0; i < 3; i++) {
if (pdata->usb_pdata[i]) {
if (pdata->usb_pdata[i]->phy_lowpower_suspend && !pdata->usb_pdata[i]->lowpower)
return false;
}
}
return true;
}
static void delay_process_wakeup(struct wakeup_ctrl *ctrl)
{
int i;
struct fsl_usb2_wakeup_platform_data *pdata = ctrl->pdata;
disable_irq_nosync(ctrl->wakeup_irq);
if ((ctrl->usb_irq > 0) && (ctrl->wakeup_irq != ctrl->usb_irq))
disable_irq_nosync(ctrl->usb_irq);
for (i = 0; i < 3; i++) {
if (pdata->usb_pdata[i]) {
pdata->usb_pdata[i]->irq_delay = 1;
}
}
pdata->usb_wakeup_is_pending = true;
complete(&ctrl->event);
}
static irqreturn_t usb_wakeup_handler(int irq, void *_dev)
{
struct wakeup_ctrl *ctrl = (struct wakeup_ctrl *)_dev;
irqreturn_t ret = IRQ_NONE;
if (usb2_is_in_lowpower(ctrl)) {
pr_debug("usb wakeup is here\n");
delay_process_wakeup(ctrl);
ret = IRQ_HANDLED;
}
return ret;
}
static enum usb_wakeup_event is_wakeup(struct fsl_usb2_platform_data *pdata)
{
if (pdata->is_wakeup_event)
return pdata->is_wakeup_event(pdata);
else
return WAKEUP_EVENT_INVALID;
}
static void wakeup_event_handler(struct wakeup_ctrl *ctrl)
{
struct fsl_usb2_wakeup_platform_data *pdata = ctrl->pdata;
int already_waked = 0;
enum usb_wakeup_event wakeup_evt;
int i;
wakeup_clk_gate(ctrl->pdata, true);
for (i = 0; i < 3; i++) {
struct fsl_usb2_platform_data *usb_pdata = pdata->usb_pdata[i];
if (usb_pdata) {
/* In order to get the real id/vbus value */
if (usb_event_is_otg_wakeup(usb_pdata))
usb_debounce_id_vbus();
usb_pdata->irq_delay = 0;
wakeup_evt = is_wakeup(usb_pdata);
usb_pdata->wakeup_event = wakeup_evt;
if (wakeup_evt != WAKEUP_EVENT_INVALID) {
if (usb2_is_in_lowpower(ctrl))
if (usb_pdata->usb_clock_for_pm)
usb_pdata->usb_clock_for_pm(true);
usb_pdata->lowpower = 0;
already_waked = 1;
if (usb_pdata->wakeup_handler) {
usb_pdata->wakeup_handler(usb_pdata);
}
}
}
}
/* If nothing to wakeup, clear wakeup event */
if ((already_waked == 0) && pdata->usb_wakeup_exhandle)
pdata->usb_wakeup_exhandle();
wakeup_clk_gate(ctrl->pdata, false);
pdata->usb_wakeup_is_pending = false;
wake_up(&pdata->wq);
}
static int wakeup_event_thread(void *param)
{
struct wakeup_ctrl *ctrl = (struct wakeup_ctrl *)param;
struct sched_param sch_param = {.sched_priority = 1};
sched_setscheduler(current, SCHED_RR, &sch_param);
while (1) {
wait_for_completion_interruptible(&ctrl->event);
if (kthread_should_stop())
break;
wakeup_event_handler(ctrl);
enable_irq(ctrl->wakeup_irq);
if ((ctrl->usb_irq > 0) && (ctrl->wakeup_irq != ctrl->usb_irq))
enable_irq(ctrl->usb_irq);
}
return 0;
}
static int wakeup_dev_probe(struct platform_device *pdev)
{
struct fsl_usb2_wakeup_platform_data *pdata;
struct wakeup_ctrl *ctrl = NULL;
int status;
unsigned long interrupt_flag;
printk(KERN_INFO "IMX usb wakeup probe\n");
if (!pdev || !pdev->dev.platform_data)
return -ENODEV;
ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
if (!ctrl)
return -ENOMEM;
pdata = pdev->dev.platform_data;
ctrl->pdata = pdata;
init_waitqueue_head(&pdata->wq);
pdata->usb_wakeup_is_pending = false;
init_completion(&ctrl->event);
/* Currently, both mx5x and mx6q uses usb controller's irq
* as wakeup irq.
*/
ctrl->wakeup_irq = platform_get_irq(pdev, 1);
ctrl->usb_irq = platform_get_irq(pdev, 1);
if (ctrl->wakeup_irq != ctrl->usb_irq)
interrupt_flag = IRQF_DISABLED;
else
interrupt_flag = IRQF_SHARED;
status = request_irq(ctrl->wakeup_irq, usb_wakeup_handler, interrupt_flag, "usb_wakeup", (void *)ctrl);
if (status)
goto error1;
ctrl->thread = kthread_run(wakeup_event_thread, (void *)ctrl, "usb_wakeup thread");
status = IS_ERR(ctrl->thread) ? -1 : 0;
if (status)
goto error2;
g_ctrl = ctrl;
printk(KERN_DEBUG "the wakeup pdata is 0x%p\n", pdata);
return 0;
error2:
free_irq(ctrl->wakeup_irq, (void *)ctrl);
error1:
kfree(ctrl);
return status;
}
static int wakeup_dev_exit(struct platform_device *pdev)
{
if (g_ctrl->thread) {
complete(&g_ctrl->event);
kthread_stop(g_ctrl->thread);
}
free_irq(g_ctrl->wakeup_irq, (void *)g_ctrl);
kfree(g_ctrl);
return 0;
}
static struct platform_driver wakeup_d = {
.probe = wakeup_dev_probe,
.remove = wakeup_dev_exit,
.driver = {
.name = "usb-wakeup",
},
};
static int __init wakeup_dev_init(void)
{
return platform_driver_register(&wakeup_d);
}
static void __exit wakeup_dev_uninit(void)
{
platform_driver_unregister(&wakeup_d);
}
subsys_initcall(wakeup_dev_init);
module_exit(wakeup_dev_uninit);
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