ACPI / ACPICA: Use helper function for computing GPE masks

In quite a few places ACPICA needs to compute a GPE enable mask with
only one bit, corresponding to a given GPE, set.  Currently, that
computation is always open coded which leads to unnecessary code
duplication.  Fix this by introducing a helper function for computing
one-bit GPE enable masks and using it where appropriate.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Len Brown <len.brown@intel.com>

3 files changed, 46 insertions, 16 deletions

diff --git a/drivers/acpi/acpica/achware.h b/drivers/acpi/acpica/achware.h
index 5900f135dc6d..c46277d179f0 100644
--- a/drivers/acpi/acpica/achware.h
+++ b/drivers/acpi/acpica/achware.h
@@ -90,6 +90,9 @@ acpi_status acpi_hw_write_port(acpi_io_address address, u32 value, u32 width);
 /*
  * hwgpe - GPE support
  */
+u32 acpi_hw_gpe_register_bit(struct acpi_gpe_event_info *gpe_event_info,
+                             struct acpi_gpe_register_info *gpe_register_info);
+
 acpi_status acpi_hw_low_disable_gpe(struct acpi_gpe_event_info *gpe_event_info);
 
 acpi_status
diff --git a/drivers/acpi/acpica/evgpe.c b/drivers/acpi/acpica/evgpe.c
index deb26f4c6623..57eeb3bde41e 100644
--- a/drivers/acpi/acpica/evgpe.c
+++ b/drivers/acpi/acpica/evgpe.c
@@ -69,7 +69,7 @@ acpi_status
 acpi_ev_update_gpe_enable_masks(struct acpi_gpe_event_info *gpe_event_info)
 {
         struct acpi_gpe_register_info *gpe_register_info;
-        u8 register_bit;
+        u32 register_bit;
 
         ACPI_FUNCTION_TRACE(ev_update_gpe_enable_masks);
 
@@ -78,9 +78,8 @@ acpi_ev_update_gpe_enable_masks(struct acpi_gpe_event_info *gpe_event_info)
                 return_ACPI_STATUS(AE_NOT_EXIST);
         }
 
-        register_bit = (u8)
-            (1 <<
-             (gpe_event_info->gpe_number - gpe_register_info->base_gpe_number));
+        register_bit = acpi_hw_gpe_register_bit(gpe_event_info,
+                                                gpe_register_info);
 
         /* Clear the wake/run bits up front */
 
diff --git a/drivers/acpi/acpica/hwgpe.c b/drivers/acpi/acpica/hwgpe.c
index bd72319a38f0..d989b8e786cc 100644
--- a/drivers/acpi/acpica/hwgpe.c
+++ b/drivers/acpi/acpica/hwgpe.c
@@ -57,6 +57,27 @@ acpi_hw_enable_wakeup_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
 
 /******************************************************************************
  *
+ * FUNCTION:    acpi_hw_gpe_register_bit
+ *
+ * PARAMETERS:  gpe_event_info      - Info block for the GPE
+ *              gpe_register_info   - Info block for the GPE register
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Compute GPE enable mask with one bit corresponding to the given
+ *              GPE set.
+ *
+ ******************************************************************************/
+
+u32 acpi_hw_gpe_register_bit(struct acpi_gpe_event_info *gpe_event_info,
+                             struct acpi_gpe_register_info *gpe_register_info)
+{
+        return (u32)1 << (gpe_event_info->gpe_number -
+                                gpe_register_info->base_gpe_number);
+}
+
+/******************************************************************************
+ *
  * FUNCTION:    acpi_hw_low_disable_gpe
  *
  * PARAMETERS:  gpe_event_info      - Info block for the GPE to be disabled
@@ -72,6 +93,7 @@ acpi_status acpi_hw_low_disable_gpe(struct acpi_gpe_event_info *gpe_event_info)
         struct acpi_gpe_register_info *gpe_register_info;
         acpi_status status;
         u32 enable_mask;
+        u32 register_bit;
 
         /* Get the info block for the entire GPE register */
 
@@ -89,9 +111,9 @@ acpi_status acpi_hw_low_disable_gpe(struct acpi_gpe_event_info *gpe_event_info)
 
         /* Clear just the bit that corresponds to this GPE */
 
-        ACPI_CLEAR_BIT(enable_mask, ((u32)1 <<
-                                     (gpe_event_info->gpe_number -
-                                      gpe_register_info->base_gpe_number)));
+        register_bit = acpi_hw_gpe_register_bit(gpe_event_info,
+                                                gpe_register_info);
+        ACPI_CLEAR_BIT(enable_mask, register_bit);
 
         /* Write the updated enable mask */
 
@@ -150,21 +172,28 @@ acpi_hw_write_gpe_enable_reg(struct acpi_gpe_event_info * gpe_event_info)
 
 acpi_status acpi_hw_clear_gpe(struct acpi_gpe_event_info * gpe_event_info)
 {
+        struct acpi_gpe_register_info *gpe_register_info;
         acpi_status status;
-        u8 register_bit;
+        u32 register_bit;
 
         ACPI_FUNCTION_ENTRY();
 
-        register_bit = (u8)(1 <<
-                            (gpe_event_info->gpe_number -
-                             gpe_event_info->register_info->base_gpe_number));
+        /* Get the info block for the entire GPE register */
+
+        gpe_register_info = gpe_event_info->register_info;
+        if (!gpe_register_info) {
+                return (AE_NOT_EXIST);
+        }
+
+        register_bit = acpi_hw_gpe_register_bit(gpe_event_info,
+                                                gpe_register_info);
 
         /*
          * Write a one to the appropriate bit in the status register to
          * clear this GPE.
          */
         status = acpi_hw_write(register_bit,
-                               &gpe_event_info->register_info->status_address);
+                               &gpe_register_info->status_address);
 
         return (status);
 }
@@ -187,7 +216,7 @@ acpi_hw_get_gpe_status(struct acpi_gpe_event_info * gpe_event_info,
                        acpi_event_status * event_status)
 {
         u32 in_byte;
-        u8 register_bit;
+        u32 register_bit;
         struct acpi_gpe_register_info *gpe_register_info;
         acpi_status status;
         acpi_event_status local_event_status = 0;
@@ -204,9 +233,8 @@ acpi_hw_get_gpe_status(struct acpi_gpe_event_info * gpe_event_info,
 
         /* Get the register bitmask for this GPE */
 
-        register_bit = (u8)(1 <<
-                            (gpe_event_info->gpe_number -
-                             gpe_event_info->register_info->base_gpe_number));
+        register_bit = acpi_hw_gpe_register_bit(gpe_event_info,
+                                                gpe_register_info);
 
         /* GPE currently enabled? (enabled for runtime?) */