patch-2.4.0-prerelease linux/drivers/acpi/power.c

• Lines: 138
• Date: Fri Dec 29 14:07:21 2000
• Orig file: v2.4.0-test12/linux/drivers/acpi/power.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.0-test12/linux/drivers/acpi/power.c linux/drivers/acpi/power.c
@@ -0,0 +1,137 @@
+/*
+ *  power.c - Overall power driver. Also handles AC adapter device.
+ *
+ *  Copyright (C) 2000 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 <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/proc_fs.h>
+#include "acpi.h"
+#include "driver.h"
+
+#define _COMPONENT	OS_DEPENDENT
+	MODULE_NAME	("power")
+
+int acpi_cmbatt_init(void);
+int acpi_cmbatt_terminate(void);
+
+/* ACPI-specific defines */
+#define ACPI_AC_ADAPTER_HID	"ACPI0003"
+
+static int ac_count = 0;
+static ACPI_HANDLE ac_handle = 0;
+
+/*
+ * We found a device with the correct HID
+ */
+static ACPI_STATUS
+acpi_found_ac_adapter(ACPI_HANDLE handle, u32 level, void *ctx, void **value)
+{
+	ACPI_DEVICE_INFO	info;
+
+	if (ac_count > 0) {
+		printk(KERN_ERR "AC Adapter: more than one!\n");
+		return (AE_OK);
+	}
+
+	if (!ACPI_SUCCESS(acpi_get_object_info(handle, &info))) {
+		printk(KERN_ERR "AC Adapter: Could not get AC Adapter object info\n");
+		return (AE_OK);
+	}
+
+	if (!(info.valid & ACPI_VALID_STA)) {
+		printk(KERN_ERR "AC Adapter: Battery _STA invalid\n");
+		return AE_OK;
+	}
+
+	printk(KERN_INFO "AC Adapter: found\n");
+
+	ac_handle = handle;
+
+	ac_count++;
+
+	return AE_OK;
+}
+
+static int
+proc_read_ac_adapter_status(char *page, char **start, off_t off,
+				int count, int *eof, void *data)
+{
+	ACPI_OBJECT obj;
+	ACPI_BUFFER buf;
+
+	char *p = page;
+	int len;
+
+	buf.length = sizeof(obj);
+	buf.pointer = &obj;
+	if (!ACPI_SUCCESS(acpi_evaluate_object(ac_handle, "_PSR", NULL, &buf))
+		|| obj.type != ACPI_TYPE_NUMBER) {
+		p += sprintf(p, "Could not read AC status\n");
+		goto end;
+	}
+
+	if (obj.number.value)
+		p += sprintf(p, "on-line\n");
+	else
+		p += sprintf(p, "off-line\n");
+
+end:
+	len = (p - page);
+	if (len <= off+count) *eof = 1;
+	*start = page + off;
+	len -= off;
+	if (len>count) len = count;
+	if (len<0) len = 0;
+	return len;
+}
+
+int
+acpi_power_init(void)
+{
+	acpi_get_devices(ACPI_AC_ADAPTER_HID, 
+			acpi_found_ac_adapter,
+			NULL,
+			NULL);
+
+	if (!proc_mkdir("power", NULL))
+		return 0;
+
+	if (ac_handle) {
+		create_proc_read_entry("power/ac", 0, NULL,
+			proc_read_ac_adapter_status, NULL);
+	}
+
+	acpi_cmbatt_init();
+
+	return 0;
+}
+
+int
+acpi_power_terminate(void)
+{
+	acpi_cmbatt_terminate();
+
+	if (ac_handle) {
+		remove_proc_entry("power/ac", NULL);
+	}
+
+	remove_proc_entry("power", NULL);
+
+	return 0;
+}