Re: [PATCH v1] Input: tegra-kbc - report wakeup key for some platforms.

From: Rakesh Iyer <redacted>

Tegra kbc cannot detect exact keypress causing wakeup in interrupt mode.
Allow wakeup keypress to be reported for certain platforms.

Signed-off-by: Rakesh Iyer <redacted>
---
 arch/arm/mach-tegra/include/mach/kbc.h |    1 +
 drivers/input/keyboard/tegra-kbc.c     |   20 ++++++++++++++++----
 2 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/arch/arm/mach-tegra/include/mach/kbc.h b/arch/arm/mach-tegra/include/mach/kbc.h
index 4f3572a..20bb054 100644
--- a/arch/arm/mach-tegra/include/mach/kbc.h
+++ b/arch/arm/mach-tegra/include/mach/kbc.h

@@ -53,6 +53,7 @@ struct tegra_kbc_platform_data {
 	struct tegra_kbc_pin_cfg pin_cfg[KBC_MAX_GPIO];
 	const struct matrix_keymap_data *keymap_data;
 
+	u32 wakeup_key;
 	bool wakeup;
 	bool use_fn_map;
 	bool use_ghost_filter;

diff --git a/drivers/input/keyboard/tegra-kbc.c b/drivers/input/keyboard/tegra-kbc.c
index cf3228b..ceb1185 100644
--- a/drivers/input/keyboard/tegra-kbc.c
+++ b/drivers/input/keyboard/tegra-kbc.c

@@ -52,6 +52,7 @@
 /* KBC Interrupt Register */
 #define KBC_INT_0	0x4
 #define KBC_INT_FIFO_CNT_INT_STATUS	(1 << 2)
+#define KBC_INT_KEYPRESS_INT_STATUS	(1 << 0)
 
 #define KBC_ROW_CFG0_0	0x8
 #define KBC_COL_CFG0_0	0x18

@@ -74,10 +75,12 @@ struct tegra_kbc {
 	unsigned int cp_to_wkup_dly;
 	bool use_fn_map;
 	bool use_ghost_filter;
+	bool keypress_caused_wake;
 	const struct tegra_kbc_platform_data *pdata;
 	unsigned short keycode[KBC_MAX_KEY * 2];
 	unsigned short current_keys[KBC_MAX_KPENT];
 	unsigned int num_pressed_keys;
+	u32 wakeup_key;
 	struct timer_list timer;
 	struct clk *clk;
 };

@@ -409,6 +412,9 @@ static irqreturn_t tegra_kbc_isr(int irq, void *args)
 		 */
 		tegra_kbc_set_fifo_interrupt(kbc, false);
 		mod_timer(&kbc->timer, jiffies + kbc->cp_dly_jiffies);
+	} else if (val & KBC_INT_KEYPRESS_INT_STATUS) {
+		/* We can be here only through system resume path */
+		kbc->keypress_caused_wake = true;
 	}
 
 	spin_unlock_irqrestore(&kbc->lock, flags);

@@ -674,9 +680,10 @@ static int __devinit tegra_kbc_probe(struct platform_device *pdev)
 	keymap_data = pdata->keymap_data ?: &tegra_kbc_default_keymap_data;
 	matrix_keypad_build_keymap(keymap_data, KBC_ROW_SHIFT,
 				   input_dev->keycode, input_dev->keybit);
+	kbc->wakeup_key = pdata->wakeup_key;
 
-	err = request_irq(kbc->irq, tegra_kbc_isr, IRQF_TRIGGER_HIGH,
-			  pdev->name, kbc);
+	err = request_irq(kbc->irq, tegra_kbc_isr,
+			  IRQF_NO_SUSPEND | IRQF_TRIGGER_HIGH, pdev->name, kbc);
 	if (err) {
 		dev_err(&pdev->dev, "failed to request keyboard IRQ\n");
 		goto err_put_clk;

@@ -738,7 +745,6 @@ static int tegra_kbc_suspend(struct device *dev)
 
 	mutex_lock(&kbc->idev->mutex);
 	if (device_may_wakeup(&pdev->dev)) {
-		disable_irq(kbc->irq);
 		del_timer_sync(&kbc->timer);
 		tegra_kbc_set_fifo_interrupt(kbc, false);