thinkpad-acpi: fix brightness hotkey poll handling

Handle multiple brightness hotkey presses between two polling cycles.

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>

diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index b03bf51..fa412a4 100644 (file)
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -2340,6 +2340,21 @@ static void hotkey_compare_and_issue_event(struct tp_nvram_state *oldn,
                }
        }
 
+       void issue_brightnesschange(const unsigned int oldbrt,
+                                   const unsigned int newbrt)
+       {
+               unsigned int i = oldbrt;
+
+               while (i > newbrt) {
+                       TPACPI_MAY_SEND_KEY(TP_ACPI_HOTKEYSCAN_FNEND);
+                       i--;
+               }
+               while (i < newbrt) {
+                       TPACPI_MAY_SEND_KEY(TP_ACPI_HOTKEYSCAN_FNHOME);
+                       i++;
+               }
+       }
+
        TPACPI_COMPARE_KEY(TP_ACPI_HOTKEYSCAN_THINKPAD, thinkpad_toggle);
        TPACPI_COMPARE_KEY(TP_ACPI_HOTKEYSCAN_FNSPACE, zoom_toggle);
        TPACPI_COMPARE_KEY(TP_ACPI_HOTKEYSCAN_FNF7, display_toggle);
@@ -2394,19 +2409,16 @@ static void hotkey_compare_and_issue_event(struct tp_nvram_state *oldn,
        }
 
        /* handle brightness */
-       if (oldn->brightness_toggle != newn->brightness_toggle) {
-               if (oldn->brightness_level < newn->brightness_level) {
-                       TPACPI_MAY_SEND_KEY(TP_ACPI_HOTKEYSCAN_FNHOME);
-               } else if (oldn->brightness_level > newn->brightness_level) {
+       if (oldn->brightness_level != newn->brightness_level) {
+               issue_brightnesschange(oldn->brightness_level,
+                                      newn->brightness_level);
+       } else if (oldn->brightness_toggle != newn->brightness_toggle) {
+               /* repeated key presses that didn't change state */
+               if (newn->brightness_level == 0)
                        TPACPI_MAY_SEND_KEY(TP_ACPI_HOTKEYSCAN_FNEND);
-               } else {
-                       /* repeated key presses that didn't change state */
-                       if (newn->brightness_level != 0) {
-                               TPACPI_MAY_SEND_KEY(TP_ACPI_HOTKEYSCAN_FNHOME);
-                       } else {
-                               TPACPI_MAY_SEND_KEY(TP_ACPI_HOTKEYSCAN_FNEND);
-                       }
-               }
+               else if (newn->brightness_level >= bright_maxlvl
+                               && !tp_features.bright_unkfw)
+                       TPACPI_MAY_SEND_KEY(TP_ACPI_HOTKEYSCAN_FNHOME);
        }
 
 #undef TPACPI_COMPARE_KEY