[PATCH v2 1/3] platform: x86: intel-vbtn: Wake up the system from suspend-to-idle

[Rafael J. Wysocki]

From: Rafael J. Wysocki <rafael.j.wyso...@intel.com>

Allow the intel-vbtn driver to wake up the system from suspend-to-idle
by configuring its platform device as a wakeup one by default and
switching it over to a system wakeup events triggering mode during
system suspend transitions.

Signed-off-by: Rafael J. Wysocki <rafael.j.wyso...@intel.com>
Acked-by: Andy Shevchenko <andriy.shevche...@linux.intel.com>
---

-> v2: Added tag.

---
 drivers/platform/x86/intel-vbtn.c |   39 +++++++++++++++++++++++++++++++++++---
 1 file changed, 36 insertions(+), 3 deletions(-)

Index: linux-pm/drivers/platform/x86/intel-vbtn.c
===================================================================
--- linux-pm.orig/drivers/platform/x86/intel-vbtn.c
+++ linux-pm/drivers/platform/x86/intel-vbtn.c
@@ -23,6 +23,7 @@
 #include <linux/platform_device.h>
 #include <linux/input/sparse-keymap.h>
 #include <linux/acpi.h>
+#include <linux/suspend.h>
 #include <acpi/acpi_bus.h>
 
 MODULE_LICENSE("GPL");
@@ -46,6 +47,7 @@ static const struct key_entry intel_vbtn
 
 struct intel_vbtn_priv {
        struct input_dev *input_dev;
+       bool wakeup_mode;
 };
 
 static int intel_vbtn_input_setup(struct platform_device *device)
@@ -73,9 +75,15 @@ static void notify_handler(acpi_handle h
        struct platform_device *device = context;
        struct intel_vbtn_priv *priv = dev_get_drvdata(&device->dev);
 
-       if (!sparse_keymap_report_event(priv->input_dev, event, 1, true))
-               dev_info(&device->dev, "unknown event index 0x%x\n",
-                        event);
+       if (priv->wakeup_mode) {
+               if (sparse_keymap_entry_from_scancode(priv->input_dev, event)) {
+                       pm_wakeup_hard_event(&device->dev);
+                       return;
+               }
+       } else if (sparse_keymap_report_event(priv->input_dev, event, 1, true)) 
{
+               return;
+       }
+       dev_info(&device->dev, "unknown event index 0x%x\n", event);
 }
 
 static int intel_vbtn_probe(struct platform_device *device)
@@ -109,6 +117,7 @@ static int intel_vbtn_probe(struct platf
        if (ACPI_FAILURE(status))
                return -EBUSY;
 
+       device_init_wakeup(&device->dev, true);
        return 0;
 }
 
@@ -125,10 +134,34 @@ static int intel_vbtn_remove(struct plat
        return 0;
 }
 
+static int intel_vbtn_pm_prepare(struct device *dev)
+{
+       struct intel_vbtn_priv *priv = dev_get_drvdata(dev);
+
+       priv->wakeup_mode = true;
+       return 0;
+}
+
+static int intel_vbtn_pm_resume(struct device *dev)
+{
+       struct intel_vbtn_priv *priv = dev_get_drvdata(dev);
+
+       priv->wakeup_mode = false;
+       return 0;
+}
+
+static const struct dev_pm_ops intel_vbtn_pm_ops = {
+       .prepare = intel_vbtn_pm_prepare,
+       .resume = intel_vbtn_pm_resume,
+       .restore = intel_vbtn_pm_resume,
+       .thaw = intel_vbtn_pm_resume,
+};
+
 static struct platform_driver intel_vbtn_pl_driver = {
        .driver = {
                .name = "intel-vbtn",
                .acpi_match_table = intel_vbtn_ids,
+               .pm = &intel_vbtn_pm_ops,
        },
        .probe = intel_vbtn_probe,
        .remove = intel_vbtn_remove,