platform: x86: intel-hid: Wake up the system from suspend-to-idle

Allow the intel-hid 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.wysocki@intel.com>
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

diff --git a/drivers/platform/x86/intel-hid.c b/drivers/platform/x86/intel-hid.c
index 63ba2cb..8519e0f 100644 (file)
--- a/drivers/platform/x86/intel-hid.c
+++ b/drivers/platform/x86/intel-hid.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");
@@ -75,6 +76,7 @@ static const struct key_entry intel_array_keymap[] = {
 struct intel_hid_priv {
        struct input_dev *input_dev;
        struct input_dev *array;
+       bool wakeup_mode;
 };
 
 static int intel_hid_set_enable(struct device *device, bool enable)
@@ -116,23 +118,37 @@ static void intel_button_array_enable(struct device *device, bool enable)
                dev_warn(device, "failed to set button capability\n");
 }
 
-static int intel_hid_pl_suspend_handler(struct device *device)
+static int intel_hid_pm_prepare(struct device *device)
 {
-       intel_hid_set_enable(device, false);
-       intel_button_array_enable(device, false);
+       struct intel_hid_priv *priv = dev_get_drvdata(device);
+
+       priv->wakeup_mode = true;
+       return 0;
+}
 
+static int intel_hid_pl_suspend_handler(struct device *device)
+{
+       if (pm_suspend_via_firmware()) {
+               intel_hid_set_enable(device, false);
+               intel_button_array_enable(device, false);
+       }
        return 0;
 }
 
 static int intel_hid_pl_resume_handler(struct device *device)
 {
-       intel_hid_set_enable(device, true);
-       intel_button_array_enable(device, true);
+       struct intel_hid_priv *priv = dev_get_drvdata(device);
 
+       priv->wakeup_mode = false;
+       if (pm_resume_via_firmware()) {
+               intel_hid_set_enable(device, true);
+               intel_button_array_enable(device, true);
+       }
        return 0;
 }
 
 static const struct dev_pm_ops intel_hid_pl_pm_ops = {
+       .prepare = intel_hid_pm_prepare,
        .freeze  = intel_hid_pl_suspend_handler,
        .thaw  = intel_hid_pl_resume_handler,
        .restore  = intel_hid_pl_resume_handler,
@@ -186,6 +202,19 @@ static void notify_handler(acpi_handle handle, u32 event, void *context)
        unsigned long long ev_index;
        acpi_status status;
 
+       if (priv->wakeup_mode) {
+               /* Wake up on 5-button array events only. */
+               if (event == 0xc0 || !priv->array)
+                       return;
+
+               if (sparse_keymap_entry_from_scancode(priv->array, event))
+                       pm_wakeup_hard_event(&device->dev);
+               else
+                       dev_info(&device->dev, "unknown event 0x%x\n", event);
+
+               return;
+       }
+
        /* 0xC0 is for HID events, other values are for 5 button array */
        if (event != 0xc0) {
                if (!priv->array ||
@@ -270,6 +299,7 @@ static int intel_hid_probe(struct platform_device *device)
                                 "failed to enable HID power button\n");
        }
 
+       device_init_wakeup(&device->dev, true);
        return 0;
 
 err_remove_notify: