linux-kernel - [PATCH v3] extcon: gpio: Add power resume support

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Message-Id: <1389070590-3139-1-git-send-email-rongjun.ying@csr.com>
Date:	Tue,  7 Jan 2014 12:56:30 +0800
From:	RongJun Ying <rjying@...il.com>
To:	MyungJoo Ham <myungjoo.ham@...sung.com>,
	Chanwoo Choi <cw00.choi@...sung.com>,
	Barry Song <Barry.Song@....com>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Workgroup.linux@....com, Rongjun Ying <rongjun.ying@....com>
Subject: [PATCH v3] extcon: gpio: Add power resume support

From: Rongjun Ying <rongjun.ying@....com>

When system on the suspend state, Some SoC can't get gpio interrupt.
After system resume, need send extcon uevent to userspace.

Signed-off-by: Rongjun Ying <rongjun.ying@....com>
Reviewed-by: Barry Song <Baohua.Song@....com>
---
 -v3:
 'check_on_resume' instead of 'load_sleep_irq' as Chanwoo Choi's proposal.

 drivers/extcon/extcon-gpio.c       |   20 ++++++++++++++++++++
 include/linux/extcon/extcon-gpio.h |    1 +
 2 files changed, 21 insertions(+), 0 deletions(-)

diff --git a/drivers/extcon/extcon-gpio.c b/drivers/extcon/extcon-gpio.c
index 7e0dff5..fde52c1 100644
--- a/drivers/extcon/extcon-gpio.c
+++ b/drivers/extcon/extcon-gpio.c
@@ -40,6 +40,7 @@ struct gpio_extcon_data {
 	int irq;
 	struct delayed_work work;
 	unsigned long debounce_jiffies;
+	bool check_on_resume;
 };

 static void gpio_extcon_work(struct work_struct *work)
@@ -103,6 +104,7 @@ static int gpio_extcon_probe(struct platform_device *pdev)
 	extcon_data->gpio_active_low = pdata->gpio_active_low;
 	extcon_data->state_on = pdata->state_on;
 	extcon_data->state_off = pdata->state_off;
+	extcon_data->check_on_resume = pdata->check_on_resume;
 	if (pdata->state_on && pdata->state_off)
 		extcon_data->edev.print_state = extcon_gpio_print_state;
 	if (pdata->debounce) {
@@ -159,12 +161,30 @@ static int gpio_extcon_remove(struct platform_device *pdev)
 	return 0;
 }

+#ifdef CONFIG_PM_SLEEP
+static int gpio_extcon_resume(struct device *dev)
+{
+	struct gpio_extcon_data *extcon_data;
+
+	extcon_data = dev_get_drvdata(dev);
+	if (extcon_data->check_on_resume)
+		queue_delayed_work(system_power_efficient_wq,
+			&extcon_data->work, extcon_data->debounce_jiffies);
+	return 0;
+}
+#endif
+
+static const struct dev_pm_ops gpio_extcon_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(NULL, gpio_extcon_resume)
+};
+
 static struct platform_driver gpio_extcon_driver = {
 	.probe		= gpio_extcon_probe,
 	.remove		= gpio_extcon_remove,
 	.driver		= {
 		.name	= "extcon-gpio",
 		.owner	= THIS_MODULE,
+		.pm = &gpio_extcon_pm_ops,
 	},
 };

diff --git a/include/linux/extcon/extcon-gpio.h b/include/linux/extcon/extcon-gpio.h
index 4195810..c7f0c3e 100644
--- a/include/linux/extcon/extcon-gpio.h
+++ b/include/linux/extcon/extcon-gpio.h
@@ -51,6 +51,7 @@ struct gpio_extcon_platform_data {
 	/* if NULL, "0" or "1" will be printed */
 	const char *state_on;
 	const char *state_off;
+	bool check_on_resume;
 };

 #endif /* __EXTCON_GPIO_H__ */
--
1.7.5.4

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