patch-2.4.0-test3 linux/drivers/acpi/hardware/hwgpe.c

• Lines: 209
• Date: Wed Jul 5 11:23:12 2000
• Orig file: v2.4.0-test2/linux/drivers/acpi/hardware/hwgpe.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.0-test2/linux/drivers/acpi/hardware/hwgpe.c linux/drivers/acpi/hardware/hwgpe.c
@@ -0,0 +1,208 @@
+/******************************************************************************
+ *
+ * Module Name: hwgpe - Low level GPE enable/disable/clear functions
+ *
+ *****************************************************************************/
+
+/*
+ *  Copyright (C) 2000 R. Byron Moore
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include "acpi.h"
+#include "hardware.h"
+#include "namesp.h"
+#include "events.h"
+
+#define _COMPONENT          HARDWARE
+	 MODULE_NAME         ("hwgpe");
+
+
+u8 decode_to8bit [8] = {1,2,4,8,16,32,64,128};
+
+
+/******************************************************************************
+ *
+ * FUNCTION:    Acpi_hw_enable_gpe
+ *
+ * PARAMETERS:  Gpe_number      - The GPE
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Enable a single GPE.
+ *
+ ******************************************************************************/
+
+void
+acpi_hw_enable_gpe (
+	u32                     gpe_number)
+{
+	u8                      in_byte;
+	u32                     register_index;
+	u8                      bit_mask;
+
+	/*
+	 * Translate GPE number to index into global registers array.
+	 */
+	register_index = acpi_gbl_gpe_valid[gpe_number];
+
+	/*
+	 * Figure out the bit offset for this GPE within the target register.
+	 */
+	bit_mask = decode_to8bit [MOD_8 (gpe_number)];
+
+	/*
+	 * Read the current value of the register, set the appropriate bit
+	 * to enable the GPE, and write out the new register.
+	 */
+	in_byte = acpi_os_in8 (acpi_gbl_gpe_registers[register_index].enable_addr);
+	acpi_os_out8 (acpi_gbl_gpe_registers[register_index].enable_addr,
+			 (u8)(in_byte | bit_mask));
+}
+
+
+/******************************************************************************
+ *
+ * FUNCTION:    Acpi_hw_disable_gpe
+ *
+ * PARAMETERS:  Gpe_number      - The GPE
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Disable a single GPE.
+ *
+ ******************************************************************************/
+
+void
+acpi_hw_disable_gpe (
+	u32                     gpe_number)
+{
+	u8                      in_byte;
+	u32                     register_index;
+	u8                      bit_mask;
+
+	/*
+	 * Translate GPE number to index into global registers array.
+	 */
+	register_index = acpi_gbl_gpe_valid[gpe_number];
+
+	/*
+	 * Figure out the bit offset for this GPE within the target register.
+	 */
+	bit_mask = decode_to8bit [MOD_8 (gpe_number)];
+
+	/*
+	 * Read the current value of the register, clear the appropriate bit,
+	 * and write out the new register value to disable the GPE.
+	 */
+	in_byte = acpi_os_in8 (acpi_gbl_gpe_registers[register_index].enable_addr);
+	acpi_os_out8 (acpi_gbl_gpe_registers[register_index].enable_addr,
+			 (u8)(in_byte & ~bit_mask));
+}
+
+
+/******************************************************************************
+ *
+ * FUNCTION:    Acpi_hw_clear_gpe
+ *
+ * PARAMETERS:  Gpe_number      - The GPE
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Clear a single GPE.
+ *
+ ******************************************************************************/
+
+void
+acpi_hw_clear_gpe (
+	u32                     gpe_number)
+{
+	u32                     register_index;
+	u8                      bit_mask;
+
+	/*
+	 * Translate GPE number to index into global registers array.
+	 */
+	register_index = acpi_gbl_gpe_valid[gpe_number];
+
+	/*
+	 * Figure out the bit offset for this GPE within the target register.
+	 */
+	bit_mask = decode_to8bit [MOD_8 (gpe_number)];
+
+	/*
+	 * Write a one to the appropriate bit in the status register to
+	 * clear this GPE.
+	 */
+	acpi_os_out8 (acpi_gbl_gpe_registers[register_index].status_addr, bit_mask);
+}
+
+
+/******************************************************************************
+ *
+ * FUNCTION:    Acpi_hw_get_gpe_status
+ *
+ * PARAMETERS:  Gpe_number      - The GPE
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Return the status of a single GPE.
+ *
+ ******************************************************************************/
+
+void
+acpi_hw_get_gpe_status (
+	u32                     gpe_number,
+	ACPI_EVENT_STATUS       *event_status)
+{
+	u8                      in_byte = 0;
+	u32                     register_index = 0;
+	u8                      bit_mask = 0;
+
+	if (!event_status) {
+		return;
+	}
+
+	(*event_status) = 0;
+
+	/*
+	 * Translate GPE number to index into global registers array.
+	 */
+	register_index = acpi_gbl_gpe_valid[gpe_number];
+
+	/*
+	 * Figure out the bit offset for this GPE within the target register.
+	 */
+	bit_mask = decode_to8bit [MOD_8 (gpe_number)];
+
+	/*
+	 * Enabled?:
+	 */
+	in_byte = acpi_os_in8 (acpi_gbl_gpe_registers[register_index].enable_addr);
+
+	if (bit_mask & in_byte) {
+		(*event_status) |= ACPI_EVENT_FLAG_ENABLED;
+	}
+
+	/*
+	 * Set?
+	 */
+	in_byte = acpi_os_in8 (acpi_gbl_gpe_registers[register_index].status_addr);
+
+	if (bit_mask & in_byte) {
+		(*event_status) |= ACPI_EVENT_FLAG_SET;
+	}
+}