From 040354b953a91accf776feac50a08b8f0f680ce1 Mon Sep 17 00:00:00 2001
From: paris_yeh <paris_yeh@asus.com>
Date: Thu, 30 Apr 2015 11:23:10 +0800
Subject: [PATCH] keys: notify system preparing to force reset if resetkey is
defined
On flo/deb hardware platform, the power key button is able to reset
whole system forcely via predefined timer at PMIC side. Add notifying
call chains to let registered drivers have a chance to prepare data
backup before power is cut off by PMIC firmware.
Change-Id: I25fe00020950f0d4208caffda172f46396082a4d
Signed-off-by: paris_yeh <paris_yeh@asus.com>
---
drivers/input/keyboard/gpio_keys.c | 52 ++++++++++++++++++++++++++++++
include/linux/gpio_keys.h | 10 ++++++
2 files changed, 62 insertions(+)
diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c
index 9f03500288b1..1d0fb42e2f51 100644
--- a/drivers/input/keyboard/gpio_keys.c
+++ b/drivers/input/keyboard/gpio_keys.c
@@ -40,6 +40,9 @@ struct gpio_button_data {
spinlock_t lock;
bool disabled;
bool key_pressed;
+ struct work_struct reset_work;
+ struct timer_list reset_timer;
+ unsigned int timer_hwreset; /* in msecs */
};
struct gpio_keys_drvdata {
@@ -332,6 +335,28 @@ static char *key_descriptions[] = {
};
#endif
+/* Routines for resetkey-transition notifications */
+static BLOCKING_NOTIFIER_HEAD(resetkey_chain_head);
+
+int register_resetkey_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_register(&resetkey_chain_head, nb);
+}
+EXPORT_SYMBOL_GPL(register_resetkey_notifier);
+
+int unregister_resetkey_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_unregister(&resetkey_chain_head, nb);
+}
+EXPORT_SYMBOL_GPL(unregister_resetkey_notifier);
+
+int resetkey_notifier_call_chain(unsigned long val)
+{
+ int ret = blocking_notifier_call_chain(&resetkey_chain_head, val, NULL);
+
+ return notifier_to_errno(ret);
+}
+
static void gpio_keys_gpio_report_event(struct gpio_button_data *bdata)
{
const struct gpio_keys_button *button = bdata->button;
@@ -363,6 +388,13 @@ static void gpio_keys_gpio_work_func(struct work_struct *work)
pr_info("gpio_keys: %s %s\n", state ? "Pressed" : "Released",
key_descriptions[button->code - KEY_VOLUMEDOWN]);
#endif
+ if (button->can_reset) {
+ if (state)
+ mod_timer(&bdata->reset_timer,
+ jiffies + msecs_to_jiffies(bdata->timer_hwreset));
+ else
+ del_timer_sync(&bdata->reset_timer);
+ }
gpio_keys_gpio_report_event(bdata);
}
@@ -373,6 +405,19 @@ static void gpio_keys_gpio_timer(unsigned long _data)
schedule_work(&bdata->work);
}
+static void reset_keys_work_func(struct work_struct *work)
+{
+ pr_info("gpio_keys: notify listeners pmic preparing to reset\n");
+ resetkey_notifier_call_chain(RESETKEY_PREPARE_HWREST);
+}
+
+static void powerkey_gpio_timer(unsigned long _data)
+{
+ struct gpio_button_data *bdata = (struct gpio_button_data *)_data;
+
+ schedule_work(&bdata->reset_work);
+}
+
static irqreturn_t gpio_keys_gpio_isr(int irq, void *dev_id)
{
struct gpio_button_data *bdata = dev_id;
@@ -493,6 +538,13 @@ static int __devinit gpio_keys_setup_key(struct platform_device *pdev,
isr = gpio_keys_gpio_isr;
irqflags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING;
+ if (button->can_reset) {
+ INIT_WORK(&bdata->reset_work, reset_keys_work_func);
+ bdata->timer_hwreset = button->reset_interval;
+ setup_timer(&bdata->reset_timer, powerkey_gpio_timer,
+ (unsigned long)bdata);
+ }
+
} else {
if (!button->irq) {
dev_err(dev, "No IRQ specified\n");
diff --git a/include/linux/gpio_keys.h b/include/linux/gpio_keys.h
index a7e977ff4abf..d02ba7b922d3 100644
--- a/include/linux/gpio_keys.h
+++ b/include/linux/gpio_keys.h
@@ -15,6 +15,8 @@ struct gpio_keys_button {
bool can_disable;
int value; /* axis value for EV_ABS */
unsigned int irq; /* Irq number in case of interrupt keys */
+ bool can_reset; /* key is able to reset system */
+ int reset_interval; /* reset key interval in msec */
};
struct gpio_keys_platform_data {
@@ -28,4 +30,12 @@ struct gpio_keys_platform_data {
const char *name; /* input device name */
};
+
+#define RESETKEY_PRESS 0x0001 /* power key is pressed */
+#define RESETKEY_RELEASE 0x0002 /* power key is released */
+#define RESETKEY_PREPARE_HWREST 0x0003 /* Going to reset whole system by pmic*/
+
+extern int register_resetkey_notifier(struct notifier_block *nb);
+extern int unregister_resetkey_notifier(struct notifier_block *nb);
+
#endif
--
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