patch-2.4.6 linux/drivers/acpi/ospm/ec/ectransx.c

• Lines: 327
• Date: Wed Jun 20 17:47:40 2001
• Orig file: v2.4.5/linux/drivers/acpi/ospm/ec/ectransx.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.5/linux/drivers/acpi/ospm/ec/ectransx.c linux/drivers/acpi/ospm/ec/ectransx.c
@@ -0,0 +1,326 @@
+/*****************************************************************************
+ *
+ * Module Name: ectransx.c
+ *   $Revision: 21 $
+ *
+ *****************************************************************************/
+
+/*
+ *  Copyright (C) 2000, 2001 Andrew Grover
+ *
+ *  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 "ec.h"
+
+#define _COMPONENT		ACPI_EC
+	MODULE_NAME             ("ectransx")
+
+
+/****************************************************************************
+ *
+ * FUNCTION:    ec_io_wait
+ *
+ * PARAMETERS:
+ *
+ * RETURN:
+ *
+ * DESCRIPTION:
+ *
+ ****************************************************************************/
+
+ACPI_STATUS
+ec_io_wait (
+	EC_CONTEXT              *ec,
+	EC_EVENT                wait_event)
+{
+	EC_STATUS               ec_status = 0;
+	u32                     i = 100;
+
+	if (!ec || ((wait_event != EC_EVENT_OUTPUT_BUFFER_FULL)
+		&& (wait_event != EC_EVENT_INPUT_BUFFER_EMPTY))) {
+		return(AE_BAD_PARAMETER);
+	}
+
+	/*
+	 * Wait for Event:
+	 * ---------------
+	 * Poll the EC status register waiting for the event to occur.
+	 * Note that we'll wait a maximum of 1ms in 10us chunks.
+	 */
+	switch (wait_event) {
+
+	case EC_EVENT_OUTPUT_BUFFER_FULL:
+		do {
+			ec_status = acpi_os_in8(ec->status_port);
+			if (ec_status & EC_FLAG_OUTPUT_BUFFER) {
+				return(AE_OK);
+			}
+			acpi_os_sleep_usec(10);
+		} while (--i>0);
+		break;
+
+	case EC_EVENT_INPUT_BUFFER_EMPTY:
+		do {
+			ec_status = acpi_os_in8(ec->status_port);
+			if (!(ec_status & EC_FLAG_INPUT_BUFFER)) {
+				return(AE_OK);
+			}
+			acpi_os_sleep_usec(10);
+		} while (--i>0);
+		break;
+	}
+
+	return(AE_TIME);
+}
+
+
+/****************************************************************************
+ *
+ * FUNCTION:    ec_io_read
+ *
+ * PARAMETERS:
+ *
+ * RETURN:
+ *
+ * DESCRIPTION:
+ *
+ ****************************************************************************/
+
+ACPI_STATUS
+ec_io_read (
+	EC_CONTEXT              *ec,
+	ACPI_IO_ADDRESS         io_port,
+	u8                      *data,
+	EC_EVENT                wait_event)
+{
+	ACPI_STATUS             status = AE_OK;
+
+	if (!ec || !data) {
+		return(AE_BAD_PARAMETER);
+	}
+
+	*data = acpi_os_in8(io_port);
+
+	if (wait_event) {
+		status = ec_io_wait(ec, wait_event);
+	}
+
+	return(status);
+}
+
+
+/****************************************************************************
+ *
+ * FUNCTION:    ec_io_write
+ *
+ * PARAMETERS:
+ *
+ * RETURN:
+ *
+ * DESCRIPTION:
+ *
+ ****************************************************************************/
+
+ACPI_STATUS
+ec_io_write (
+	EC_CONTEXT              *ec,
+	ACPI_IO_ADDRESS         io_port,
+	u8                      data,
+	EC_EVENT                wait_event)
+{
+	ACPI_STATUS             status = AE_OK;
+
+	if (!ec) {
+		return(AE_BAD_PARAMETER);
+	}
+
+	acpi_os_out8(io_port, data);
+
+	if (wait_event) {
+		status = ec_io_wait(ec, wait_event);
+	}
+
+	return(status);
+}
+
+
+/****************************************************************************
+ *
+ * FUNCTION:    ec_read
+ *
+ * PARAMETERS:
+ *
+ * RETURN:
+ *
+ * DESCRIPTION:
+ *
+ ****************************************************************************/
+
+ACPI_STATUS
+ec_read (
+	EC_CONTEXT              *ec,
+	u8                      address,
+	u8                      *data)
+{
+	ACPI_STATUS             status = AE_OK;
+
+	if (!ec || !data) {
+		return(AE_BAD_PARAMETER);
+	}
+
+	if (ec->use_global_lock) {
+		status = acpi_acquire_global_lock();
+		if (ACPI_FAILURE(status)) {
+			return(status);
+		}
+	}
+
+	status = ec_io_write(ec, ec->command_port, EC_COMMAND_READ,
+		EC_EVENT_INPUT_BUFFER_EMPTY);
+	if (ACPI_FAILURE(status)) {
+		return(status);
+	}
+
+	status = ec_io_write(ec, ec->data_port, address,
+		EC_EVENT_OUTPUT_BUFFER_FULL);
+	if (ACPI_FAILURE(status)) {
+		return(status);
+	}
+
+	status = ec_io_read(ec, ec->data_port, data, EC_EVENT_NONE);
+
+	if (ec->use_global_lock) {
+		acpi_release_global_lock();
+	}
+
+	return(status);
+}
+
+
+/****************************************************************************
+ *
+ * FUNCTION:    ec_write
+ *
+ * PARAMETERS:
+ *
+ * RETURN:
+ *
+ * DESCRIPTION:
+ *
+ ****************************************************************************/
+
+ACPI_STATUS
+ec_write (
+	EC_CONTEXT              *ec,
+	u8                      address,
+	u8                      data)
+{
+	ACPI_STATUS             status = AE_OK;
+
+	if (!ec)
+		return(AE_BAD_PARAMETER);
+
+	if (ec->use_global_lock) {
+		status = acpi_acquire_global_lock();
+		if (ACPI_FAILURE(status)) {
+			return(status);
+		}
+	}
+
+	status = ec_io_write(ec, ec->command_port, EC_COMMAND_WRITE,
+		EC_EVENT_INPUT_BUFFER_EMPTY);
+	if (ACPI_FAILURE(status)) {
+		return(status);
+	}
+
+	status = ec_io_write(ec, ec->data_port, address,
+		EC_EVENT_INPUT_BUFFER_EMPTY);
+	if (ACPI_FAILURE(status)) {
+		return(status);
+	}
+
+	status = ec_io_write(ec, ec->data_port, data,
+		EC_EVENT_INPUT_BUFFER_EMPTY);
+	if (ACPI_FAILURE(status)) {
+		return(status);
+	}
+
+	if (ec->use_global_lock) {
+		acpi_release_global_lock();
+	}
+
+	return(status);
+}
+
+
+/****************************************************************************
+ *
+ * FUNCTION:    ec_transaction
+ *
+ * PARAMETERS:
+ *
+ * RETURN:
+ *
+ * DESCRIPTION:
+ *
+ ****************************************************************************/
+
+ACPI_STATUS
+ec_transaction (
+	EC_CONTEXT              *ec,
+	EC_REQUEST              *request)
+{
+	ACPI_STATUS             status = AE_OK;
+
+	if (!ec || !request) {
+		return(AE_BAD_PARAMETER);
+	}
+
+	/*
+	 * Obtain mutex to serialize all EC transactions.
+	 */
+	status = acpi_os_wait_semaphore(ec->mutex, 1, EC_DEFAULT_TIMEOUT);
+	if (ACPI_FAILURE(status)) {
+		return(status);
+	}
+
+	/*
+	 * Perform the transaction.
+	 */
+	switch (request->command) {
+
+	case EC_COMMAND_READ:
+		status = ec_read(ec, request->address, &(request->data));
+		break;
+
+	case EC_COMMAND_WRITE:
+		status = ec_write(ec, request->address, request->data);
+		break;
+
+	default:
+		status = AE_SUPPORT;
+		break;
+	}
+
+	/*
+	 * Signal the mutex to indicate transaction completion.
+	 */
+	acpi_os_signal_semaphore(ec->mutex, 1);
+
+	return(status);
+}