[PATCH 2/3] platform: x86: intel-hid: Wake up the system from suspend-to-idle

Rafael J. Wysocki
2017-05-31T23:34:59Z

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

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>
---
drivers/platform/x86/intel-hid.c | 40 ++++++++++++++++++++++++++++++++++-----
1 file changed, 35 insertions(+), 5 deletions(-)

Index: linux-pm/drivers/platform/x86/intel-hid.c
===================================================================
--- linux-pm.orig/drivers/platform/x86/intel-hid.c
+++ linux-pm/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_arra
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(st
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 h
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 platfo
"failed to enable HID power button\n");
}

+ device_init_wakeup(&device->dev, true);
return 0;