ACPI: thinkpad-acpi: dequeue all pending hot key events at once (v2.2)

Receive all pending HKEY events at once from a single notification, and don't
complain if the queue is empty.

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/drivers/misc/thinkpad_acpi.c b/drivers/misc/thinkpad_acpi.c
index 9a611402ee9dafa954774c5e8a62f3e175fc16e4..3efe81b1b73c455847e7a9a6222800ee9d411f73 100644 (file)
--- a/drivers/misc/thinkpad_acpi.c
+++ b/drivers/misc/thinkpad_acpi.c
@@ -1196,9 +1196,30 @@ static void hotkey_notify(struct ibm_struct *ibm, u32 event)
 {
        u32 hkey;
        unsigned int keycode, scancode;
-       int send_acpi_ev = 0;
+       int send_acpi_ev;
+
+       if (event != 0x80) {
+               printk(IBM_ERR "unknown HKEY notification event %d\n", event);
+               /* forward it to userspace, maybe it knows how to handle it */
+               acpi_bus_generate_netlink_event(ibm->acpi->device->pnp.device_class,
+                                               ibm->acpi->device->dev.bus_id,
+                                               event, 0);
+               return;
+       }
+
+       while (1) {
+               if (!acpi_evalf(hkey_handle, &hkey, "MHKP", "d")) {
+                       printk(IBM_ERR "failed to retrieve HKEY event\n");
+                       return;
+               }
+
+               if (hkey == 0) {
+                       /* queue empty */
+                       return;
+               }
+
+               send_acpi_ev = 0;
 
-       if (event == 0x80 && acpi_evalf(hkey_handle, &hkey, "MHKP", "d")) {
                switch (hkey >> 12) {
                case 1:
                        /* 0x1000-0x1FFF: key presses */
@@ -1220,8 +1241,8 @@ static void hotkey_notify(struct ibm_struct *ibm, u32 event)
                         * eat up known LID events */
                        if (hkey != 0x5001 && hkey != 0x5002) {
                                printk(IBM_ERR
-                                       "unknown LID-related hotkey event: 0x%04x\n",
-                                       hkey);
+                                      "unknown LID-related HKEY event: 0x%04x\n",
+                                      hkey);
                                send_acpi_ev = 1;
                        }
                        break;
@@ -1240,21 +1261,17 @@ static void hotkey_notify(struct ibm_struct *ibm, u32 event)
                        printk(IBM_NOTICE "unhandled HKEY event 0x%04x\n", hkey);
                        send_acpi_ev = 1;
                }
-       } else {
-               printk(IBM_ERR "unknown hotkey notification event %d\n", event);
-               hkey = 0;
-               send_acpi_ev = 1;
-       }
 
-       /* Legacy events */
-       if (send_acpi_ev || hotkey_report_mode < 2)
-               acpi_bus_generate_proc_event(ibm->acpi->device, event, hkey);
+               /* Legacy events */
+               if (send_acpi_ev || hotkey_report_mode < 2)
+                       acpi_bus_generate_proc_event(ibm->acpi->device, event, hkey);
 
-       /* netlink events */
-       if (send_acpi_ev) {
-               acpi_bus_generate_netlink_event(ibm->acpi->device->pnp.device_class,
-                                               ibm->acpi->device->dev.bus_id,
-                                               event, hkey);
+               /* netlink events */
+               if (send_acpi_ev) {
+                       acpi_bus_generate_netlink_event(ibm->acpi->device->pnp.device_class,
+                                                       ibm->acpi->device->dev.bus_id,
+                                                       event, hkey);
+               }
        }
 }