Input: tegra-kbc - report wakeup key for some platforms

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 <riyer@nvidia.com>
Acked-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 24 insertions, 3 deletions

diff --git a/drivers/input/keyboard/tegra-kbc.c b/drivers/input/keyboard/tegra-kbc.c
index b77725db4be..a136e2e832b 100644
--- a/drivers/input/keyboard/tegra-kbc.c
+++ b/drivers/input/keyboard/tegra-kbc.c
@@ -53,6 +53,7 @@
 /* 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
@@ -75,10 +76,12 @@ 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;
 };
@@ -411,6 +414,9 @@ 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);
@@ -733,9 +739,10 @@ 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;
@@ -823,6 +830,8 @@ static int tegra_kbc_suspend(struct device *dev)
                 tegra_kbc_setup_wakekeys(kbc, true);
                 msleep(30);
 
+                kbc->keypress_caused_wake = false;
+                enable_irq(kbc->irq);
                 enable_irq_wake(kbc->irq);
         } else {
                 if (kbc->idev->users)
@@ -849,7 +858,19 @@ static int tegra_kbc_resume(struct device *dev)
 
                 tegra_kbc_set_fifo_interrupt(kbc, true);
 
-                enable_irq(kbc->irq);
+                if (kbc->keypress_caused_wake && kbc->wakeup_key) {
+                        /*
+                         * We can't report events directly from the ISR
+                         * because timekeeping is stopped when processing
+                         * wakeup request and we get a nasty warning when
+                         * we try to call do_gettimeofday() in evdev
+                         * handler.
+                         */
+                        input_report_key(kbc->idev, kbc->wakeup_key, 1);
+                        input_sync(kbc->idev);
+                        input_report_key(kbc->idev, kbc->wakeup_key, 0);
+                        input_sync(kbc->idev);
+                }
         } else {
                 if (kbc->idev->users)
                         err = tegra_kbc_start(kbc);