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authorRakesh Iyer <riyer@nvidia.com>2012-01-23 11:27:54 +0400
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2012-01-23 12:02:46 +0400
commitb6834b02e476ff0e99b6814665839e37affa31f0 (patch)
tree68dade868915a953f5e8fbb73423c110542ee467 /drivers/input/keyboard/tegra-kbc.c
parent82f6aba8eacf9dec23459832c1a0c789db28faa3 (diff)
downloadlinux-b6834b02e476ff0e99b6814665839e37affa31f0.tar.xz
Input: tegra-kbc - enable key interrupt for wakeup
Enable keypress interrupt to support wakeup from low power state. Signed-off-by: Rakesh Iyer <riyer@nvidia.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Diffstat (limited to 'drivers/input/keyboard/tegra-kbc.c')
-rw-r--r--drivers/input/keyboard/tegra-kbc.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/input/keyboard/tegra-kbc.c b/drivers/input/keyboard/tegra-kbc.c
index a136e2e832be..b307a46ecef1 100644
--- a/drivers/input/keyboard/tegra-kbc.c
+++ b/drivers/input/keyboard/tegra-kbc.c
@@ -48,6 +48,7 @@
#define KBC_FIFO_TH_CNT_SHIFT(cnt) (cnt << 14)
#define KBC_DEBOUNCE_CNT_SHIFT(cnt) (cnt << 4)
#define KBC_CONTROL_FIFO_CNT_INT_EN (1 << 3)
+#define KBC_CONTROL_KEYPRESS_INT_EN (1 << 1)
#define KBC_CONTROL_KBC_EN (1 << 0)
/* KBC Interrupt Register */
@@ -356,6 +357,18 @@ static void tegra_kbc_set_fifo_interrupt(struct tegra_kbc *kbc, bool enable)
writel(val, kbc->mmio + KBC_CONTROL_0);
}
+static void tegra_kbc_set_keypress_interrupt(struct tegra_kbc *kbc, bool enable)
+{
+ u32 val;
+
+ val = readl(kbc->mmio + KBC_CONTROL_0);
+ if (enable)
+ val |= KBC_CONTROL_KEYPRESS_INT_EN;
+ else
+ val &= ~KBC_CONTROL_KEYPRESS_INT_EN;
+ writel(val, kbc->mmio + KBC_CONTROL_0);
+}
+
static void tegra_kbc_keypress_timer(unsigned long data)
{
struct tegra_kbc *kbc = (struct tegra_kbc *)data;
@@ -831,6 +844,8 @@ static int tegra_kbc_suspend(struct device *dev)
msleep(30);
kbc->keypress_caused_wake = false;
+ /* Enable keypress interrupt before going into suspend. */
+ tegra_kbc_set_keypress_interrupt(kbc, true);
enable_irq(kbc->irq);
enable_irq_wake(kbc->irq);
} else {
@@ -852,6 +867,8 @@ static int tegra_kbc_resume(struct device *dev)
if (device_may_wakeup(&pdev->dev)) {
disable_irq_wake(kbc->irq);
tegra_kbc_setup_wakekeys(kbc, false);
+ /* We will use fifo interrupts for key detection. */
+ tegra_kbc_set_keypress_interrupt(kbc, false);
/* Restore the resident time of continuous polling mode. */
writel(kbc->cp_to_wkup_dly, kbc->mmio + KBC_TO_CNT_0);