platform/x86: intel-hid: Support 5 button array

New firmwares include a feature called 5 button array that supports
super key, volume up/down, rotation lock and power button. Support
for this feature is required to fix power button on some recent
systems.

This patch was tested on a Dell Latitude 7480.

Signed-off-by: Alex Hung <alex.hung@canonical.com>
Reviewed-by: Michał Kępień <kernel@kempniu.pl>
Signed-off-by: Darren Hart <dvhart@linux.intel.com>

diff --git a/drivers/platform/x86/intel-hid.c b/drivers/platform/x86/intel-hid.c
index cb3ab2b212b1768b8355aced7d7956f9e1ed2185..bcf438f38781019a2db04847e77aa4bfce023eee 100644 (file)
--- a/drivers/platform/x86/intel-hid.c
+++ b/drivers/platform/x86/intel-hid.c
@@ -1,5 +1,5 @@
 /*
- *  Intel HID event driver for Windows 8
+ *  Intel HID event & 5 button array driver
  *
  *  Copyright (C) 2015 Alex Hung <alex.hung@canonical.com>
  *  Copyright (C) 2015 Andrew Lutomirski <luto@kernel.org>
@@ -57,8 +57,24 @@ static const struct key_entry intel_hid_keymap[] = {
        { KE_END },
 };
 
+/* 5 button array notification value. */
+static const struct key_entry intel_array_keymap[] = {
+       { KE_KEY,    0xC2, { KEY_LEFTMETA } },                /* Press */
+       { KE_IGNORE, 0xC3, { KEY_LEFTMETA } },                /* Release */
+       { KE_KEY,    0xC4, { KEY_VOLUMEUP } },                /* Press */
+       { KE_IGNORE, 0xC5, { KEY_VOLUMEUP } },                /* Release */
+       { KE_KEY,    0xC6, { KEY_VOLUMEDOWN } },              /* Press */
+       { KE_IGNORE, 0xC7, { KEY_VOLUMEDOWN } },              /* Release */
+       { KE_SW,     0xC8, { .sw = { SW_ROTATE_LOCK, 1 } } }, /* Press */
+       { KE_SW,     0xC9, { .sw = { SW_ROTATE_LOCK, 0 } } }, /* Release */
+       { KE_KEY,    0xCE, { KEY_POWER } },                   /* Press */
+       { KE_IGNORE, 0xCF, { KEY_POWER } },                   /* Release */
+       { KE_END },
+};
+
 struct intel_hid_priv {
        struct input_dev *input_dev;
+       struct input_dev *array;
 };
 
 static int intel_hid_set_enable(struct device *device, int enable)
@@ -78,15 +94,43 @@ static int intel_hid_set_enable(struct device *device, int enable)
        return 0;
 }
 
+static void intel_button_array_enable(struct device *device, bool enable)
+{
+       struct intel_hid_priv *priv = dev_get_drvdata(device);
+       acpi_handle handle = ACPI_HANDLE(device);
+       unsigned long long button_cap;
+       acpi_status status;
+
+       if (!priv->array)
+               return;
+
+       /* Query supported platform features */
+       status = acpi_evaluate_integer(handle, "BTNC", NULL, &button_cap);
+       if (ACPI_FAILURE(status)) {
+               dev_warn(device, "failed to get button capability\n");
+               return;
+       }
+
+       /* Enable|disable features - power button is always enabled */
+       status = acpi_execute_simple_method(handle, "BTNE",
+                                           enable ? button_cap : 1);
+       if (ACPI_FAILURE(status))
+               dev_warn(device, "failed to set button capability\n");
+}
+
 static int intel_hid_pl_suspend_handler(struct device *device)
 {
        intel_hid_set_enable(device, 0);
+       intel_button_array_enable(device, false);
+
        return 0;
 }
 
 static int intel_hid_pl_resume_handler(struct device *device)
 {
        intel_hid_set_enable(device, 1);
+       intel_button_array_enable(device, true);
+
        return 0;
 }
 
@@ -126,6 +170,27 @@ err_free_device:
        return ret;
 }
 
+static int intel_button_array_input_setup(struct platform_device *device)
+{
+       struct intel_hid_priv *priv = dev_get_drvdata(&device->dev);
+       int ret;
+
+       /* Setup input device for 5 button array */
+       priv->array = devm_input_allocate_device(&device->dev);
+       if (!priv->array)
+               return -ENOMEM;
+
+       ret = sparse_keymap_setup(priv->array, intel_array_keymap, NULL);
+       if (ret)
+               return ret;
+
+       priv->array->dev.parent = &device->dev;
+       priv->array->name = "Intel HID 5 button array";
+       priv->array->id.bustype = BUS_HOST;
+
+       return input_register_device(priv->array);
+}
+
 static void intel_hid_input_destroy(struct platform_device *device)
 {
        struct intel_hid_priv *priv = dev_get_drvdata(&device->dev);
@@ -140,10 +205,11 @@ static void notify_handler(acpi_handle handle, u32 event, void *context)
        unsigned long long ev_index;
        acpi_status status;
 
-       /* The platform spec only defines one event code: 0xC0. */
+       /* 0xC0 is for HID events, other values are for 5 button array */
        if (event != 0xc0) {
-               dev_warn(&device->dev, "received unknown event (0x%x)\n",
-                        event);
+               if (!priv->array ||
+                   !sparse_keymap_report_event(priv->array, event, 1, true))
+                       dev_info(&device->dev, "unknown event 0x%x\n", event);
                return;
        }
 
@@ -161,8 +227,8 @@ static void notify_handler(acpi_handle handle, u32 event, void *context)
 static int intel_hid_probe(struct platform_device *device)
 {
        acpi_handle handle = ACPI_HANDLE(&device->dev);
+       unsigned long long event_cap, mode;
        struct intel_hid_priv *priv;
-       unsigned long long mode;
        acpi_status status;
        int err;
 
@@ -193,6 +259,15 @@ static int intel_hid_probe(struct platform_device *device)
                return err;
        }
 
+       /* Setup 5 button array */
+       status = acpi_evaluate_integer(handle, "HEBC", NULL, &event_cap);
+       if (ACPI_SUCCESS(status) && (event_cap & 0x20000)) {
+               dev_info(&device->dev, "platform supports 5 button array\n");
+               err = intel_button_array_input_setup(device);
+               if (err)
+                       pr_err("Failed to setup Intel 5 button array hotkeys\n");
+       }
+
        status = acpi_install_notify_handler(handle,
                                             ACPI_DEVICE_NOTIFY,
                                             notify_handler,
@@ -206,6 +281,16 @@ static int intel_hid_probe(struct platform_device *device)
        if (err)
                goto err_remove_notify;
 
+       if (priv->array) {
+               intel_button_array_enable(&device->dev, true);
+
+               /* Call button load method to enable HID power button */
+               status = acpi_evaluate_object(handle, "BTNL", NULL, NULL);
+               if (ACPI_FAILURE(status))
+                       dev_warn(&device->dev,
+                                "failed to enable HID power button\n");
+       }
+
        return 0;
 
 err_remove_notify:
@@ -224,6 +309,7 @@ static int intel_hid_remove(struct platform_device *device)
        acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY, notify_handler);
        intel_hid_input_destroy(device);
        intel_hid_set_enable(&device->dev, 0);
+       intel_button_array_enable(&device->dev, false);
 
        /*
         * Even if we failed to shut off the event stream, we can still