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

• Lines: 403
• Date: Fri Dec 29 14:07:21 2000
• Orig file: v2.4.0-test12/linux/drivers/acpi/cmbatt.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.0-test12/linux/drivers/acpi/cmbatt.c linux/drivers/acpi/cmbatt.c
@@ -0,0 +1,402 @@
+/*
+ *  cmbatt.c - Control Method Battery driver
+ *
+ *  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
+ */
+/*
+ * Changes:
+ * Brendan Burns <bburns@wso.williams.edu> 2000-11-15
+ * - added proc battery interface
+ * - parse returned data from _BST and _BIF
+ * Andy Grover <andrew.grover@intel.com> 2000-12-8
+ * - improved proc interface
+ */
+
+#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	("cmbatt")
+
+/* ACPI-specific defines */
+#define ACPI_CMBATT_HID		"PNP0C0A"
+#define ACPI_BATT_PRESENT	0x10
+#define ACPI_BATT_UNKNOWN	0xFFFFFFFF
+
+/* driver-specific defines */
+#define MAX_CM_BATTERIES	0x8
+#define MAX_BATT_STRLEN		0x20
+
+struct cmbatt_info
+{
+	u32  power_unit;
+	u32  design_capacity;
+	u32  last_full_capacity;
+	u32  battery_technology;
+	u32  design_voltage;
+	u32  design_capacity_warning;
+	u32  design_capacity_low;
+	u32  battery_capacity_granularity_1;
+	u32  battery_capacity_granularity_2;
+
+	char model_number[MAX_BATT_STRLEN];
+	char serial_number[MAX_BATT_STRLEN];
+	char battery_type[MAX_BATT_STRLEN];
+	char oem_info[MAX_BATT_STRLEN];
+};
+
+struct cmbatt_context
+{
+	u32			is_present;
+	ACPI_HANDLE		handle;
+	char			UID[9];
+	char			*power_unit;
+	struct cmbatt_info	info;
+};
+
+struct cmbatt_status
+{
+	u32			state;
+	u32			present_rate;
+	u32			remaining_capacity;
+	u32			present_voltage;
+};
+
+static u32 batt_count = 0;
+
+static struct cmbatt_context batt_list[MAX_CM_BATTERIES];
+
+static ACPI_STATUS
+acpi_get_battery_status(ACPI_HANDLE handle, struct cmbatt_status *result)
+{
+	ACPI_OBJECT       *obj;
+	ACPI_OBJECT       *objs;
+	ACPI_BUFFER       buf;
+
+	buf.length = 0;
+	buf.pointer = NULL;		
+
+	/* determine buffer length needed */
+	if (acpi_evaluate_object(handle, "_BST", NULL, &buf) != AE_BUFFER_OVERFLOW) {
+		printk(KERN_ERR "Cmbatt: Could not get battery status struct length\n");
+		return AE_NOT_FOUND;
+	}
+
+	buf.pointer = kmalloc(buf.length, GFP_KERNEL);
+	if (!buf.pointer)
+		return AE_NO_MEMORY;
+
+	/* get the data */
+	if (!ACPI_SUCCESS(acpi_evaluate_object(handle, "_BST", NULL, &buf))) {
+		printk(KERN_ERR "Cmbatt: Could not get battery status\n");
+		kfree (buf.pointer);
+		return AE_NOT_FOUND;
+	}
+
+	obj = (ACPI_OBJECT *) buf.pointer;
+	objs = obj->package.elements;
+
+	result->state = objs[0].number.value;
+	result->present_rate = objs[1].number.value;
+	result->remaining_capacity = objs[2].number.value;
+	result->present_voltage = objs[3].number.value;
+
+	kfree(buf.pointer);
+
+	return AE_OK;
+}
+
+static ACPI_STATUS
+acpi_get_battery_info(ACPI_HANDLE handle, struct cmbatt_info *result)
+{
+	ACPI_OBJECT       *obj;
+	ACPI_OBJECT       *objs;
+	ACPI_BUFFER       buf;
+
+	buf.length = 0;
+	buf.pointer = NULL;
+
+	/* determine the length of the data */
+	if (acpi_evaluate_object(handle, "_BIF", NULL, &buf) != AE_BUFFER_OVERFLOW) {
+		printk(KERN_ERR "Cmbatt: Could not get battery info struct length\n");
+		return AE_NOT_FOUND;
+	}
+
+	buf.pointer = kmalloc(buf.length, GFP_KERNEL);
+	if (!buf.pointer)
+		return AE_NO_MEMORY;
+
+	/* get the data */
+	if (!ACPI_SUCCESS(acpi_evaluate_object(handle, "_BIF", NULL, &buf))) {
+		printk(KERN_ERR "Cmbatt: Could not get battery info\n");
+		kfree (buf.pointer);
+		return AE_NOT_FOUND;
+	}
+	
+	obj = (ACPI_OBJECT *) buf.pointer;
+	objs = obj->package.elements;
+	
+	result->power_unit=objs[0].number.value;
+	result->design_capacity=objs[1].number.value;
+	result->last_full_capacity=objs[2].number.value;
+	result->battery_technology=objs[3].number.value;
+	result->design_voltage=objs[4].number.value;
+	result->design_capacity_warning=objs[5].number.value;
+	result->design_capacity_low=objs[6].number.value;
+	result->battery_capacity_granularity_1=objs[7].number.value;
+	result->battery_capacity_granularity_2=objs[8].number.value;
+
+	/* BUG: trailing NULL issue */
+	strncpy(result->model_number, objs[9].string.pointer, MAX_BATT_STRLEN-1);
+	strncpy(result->serial_number, objs[10].string.pointer, MAX_BATT_STRLEN-1);
+	strncpy(result->battery_type, objs[11].string.pointer, MAX_BATT_STRLEN-1);
+	strncpy(result->oem_info, objs[12].string.pointer, MAX_BATT_STRLEN-1);
+	
+	kfree(buf.pointer);
+
+	return AE_OK;
+}
+
+/*
+ * We found a device with the correct HID
+ */
+static ACPI_STATUS
+acpi_found_cmbatt(ACPI_HANDLE handle, u32 level, void *ctx, void **value)
+{
+	ACPI_DEVICE_INFO	info;
+
+	if (batt_count >= MAX_CM_BATTERIES) {
+		printk(KERN_ERR "Cmbatt: MAX_CM_BATTERIES exceeded\n");
+		return AE_OK;
+	}
+
+	if (!ACPI_SUCCESS(acpi_get_object_info(handle, &info))) {
+		printk(KERN_ERR "Cmbatt: Could not get battery object info\n");
+		return (AE_OK);
+	}
+
+	if (info.valid & ACPI_VALID_UID) {
+		strncpy(batt_list[batt_count].UID, info.unique_id, 9);
+	}
+	else if (batt_count > 1) {
+		printk(KERN_WARNING "Cmbatt: No UID but more than 1 battery\n");
+	}
+	
+	if (!(info.valid & ACPI_VALID_STA)) {
+		printk(KERN_ERR "Cmbatt: Battery _STA invalid\n");
+		return AE_OK;
+	}
+
+	if (!(info.current_status & ACPI_BATT_PRESENT)) {
+		printk(KERN_INFO "Cmbatt: Battery socket %d empty\n", batt_count);
+		batt_list[batt_count].is_present = FALSE;
+	}
+	else {
+		printk(KERN_INFO "Cmbatt: Battery socket %d occupied\n", batt_count);
+		batt_list[batt_count].is_present = TRUE;
+		if (acpi_get_battery_info(handle, &batt_list[batt_count].info) != AE_OK) {
+			printk(KERN_ERR "acpi_get_battery_info failed\n");
+			return AE_OK;
+		}
+
+		batt_list[batt_count].power_unit = (batt_list[batt_count].info.power_unit) ? "mA" : "mW";
+	}
+	
+	batt_list[batt_count].handle = handle;
+
+	batt_count++;
+
+	return AE_OK;
+}
+
+static int
+proc_read_batt_info(char *page, char **start, off_t off,
+			int count, int *eof, void *data)
+{
+	struct cmbatt_info *info;
+	u32 batt_num = (u32) data;
+	char *p = page;
+	int len;
+
+	info = &batt_list[batt_num].info;
+
+	/* don't get info more than once for a single proc read */
+	if (off != 0)
+		goto end;
+
+	if (!batt_list[batt_num].is_present) {
+		p += sprintf(p, "battery %d not present\n", batt_num);
+		goto end;
+	}
+
+	if (info->last_full_capacity == ACPI_BATT_UNKNOWN)
+		p += sprintf(p, "Unknown last full capacity\n");
+	else
+		p += sprintf(p, "Last Full Capacity %x %s /hr\n", 
+		     info->last_full_capacity, batt_list[batt_num].power_unit);
+
+	if (info->design_capacity == ACPI_BATT_UNKNOWN)
+		p += sprintf(p, "Unknown Design Capacity\n");
+	else
+		p += sprintf(p, "Design Capacity %x %s /hr\n", 
+		     info->design_capacity, batt_list[batt_num].power_unit);
+	
+	if (info->battery_technology)
+		p += sprintf(p, "Secondary Battery Technology\n");
+	else
+		p += sprintf(p, "Primary Battery Technology\n");
+	
+	if (info->design_voltage == ACPI_BATT_UNKNOWN)
+		p += sprintf(p, "Unknown Design Voltage\n");
+	else
+		p += sprintf(p, "Design Voltage %x mV\n", 
+		     info->design_voltage);
+	
+	p += sprintf(p, "Design Capacity Warning %d\n",
+		info->design_capacity_warning);
+	p += sprintf(p, "Design Capacity Low %d\n",
+		info->design_capacity_low);
+	p += sprintf(p, "Battery Capacity Granularity 1 %d\n",
+		info->battery_capacity_granularity_1);
+	p += sprintf(p, "Battery Capacity Granularity 2 %d\n",
+		info->battery_capacity_granularity_2);
+	p += sprintf(p, "model number %s\nserial number %s\nbattery type %s\nOEM info %s\n",
+		info->model_number,info->serial_number,
+		info->battery_type,info->oem_info);
+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;
+}
+
+static int
+proc_read_batt_status(char *page, char **start, off_t off,
+			int count, int *eof, void *data)
+{
+	struct cmbatt_status status;
+	u32 batt_num = (u32) data;
+	char *p = page;
+	int len;
+
+	/* don't get status more than once for a single proc read */
+	if (off != 0)
+		goto end;
+
+	if (!batt_list[batt_num].is_present) {
+		p += sprintf(p, "battery %d not present\n", batt_num);
+		goto end;
+	}
+
+	printk("getting batt status\n");
+
+	if (acpi_get_battery_status(batt_list[batt_num].handle, &status) != AE_OK) {
+		printk(KERN_ERR "Cmbatt: acpi_get_battery_status failed\n");
+		goto end;
+	}
+
+	p += sprintf(p, "Remaining Capacity: %x\n", status.remaining_capacity);
+
+	if (status.state & 0x1)
+		p += sprintf(p, "Battery discharging\n");
+	if (status.state & 0x2)
+		p += sprintf(p, "Battery charging\n");
+	if (status.state & 0x4)
+		p += sprintf(p, "Battery critically low\n");
+
+	if (status.present_rate == ACPI_BATT_UNKNOWN)
+		p += sprintf(p, "Battery rate unknown\n");
+	else
+		p += sprintf(p, "Battery rate %x\n",
+			status.present_rate);
+
+	if (status.remaining_capacity == ACPI_BATT_UNKNOWN)
+		p += sprintf(p, "Battery capacity unknown\n");
+	else
+		p += sprintf(p, "Battery capacity %x %s\n",
+			status.remaining_capacity, batt_list[batt_num].power_unit);
+
+	if (status.present_voltage == ACPI_BATT_UNKNOWN)
+		p += sprintf(p, "Battery voltage unknown\n");
+	else
+		p += sprintf(p, "Battery voltage %x volts\n",
+			status.present_voltage);
+
+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_cmbatt_init(void)
+{
+	int i;
+
+	acpi_get_devices(ACPI_CMBATT_HID, 
+			acpi_found_cmbatt,
+			NULL,
+			NULL);
+
+	for (i = 0; i < batt_count; i++) {
+
+		char batt_name[20];
+
+		sprintf(batt_name, "power/batt%d_info", i);
+		create_proc_read_entry(batt_name, 0, NULL,
+			proc_read_batt_info, (void *) i);
+
+		sprintf(batt_name, "power/batt%d_status", i);
+		create_proc_read_entry(batt_name, 0, NULL,
+			proc_read_batt_status, (void *) i);
+
+	}
+
+	return 0;
+}
+
+int
+acpi_cmbatt_terminate(void)
+{
+	int i;
+
+	for (i = 0; i < batt_count; i++) {
+
+		char batt_name[20];
+
+		sprintf(batt_name, "power/batt%d_info", i);
+		remove_proc_entry(batt_name, NULL);
+
+		sprintf(batt_name, "power/batt%d_status", i);
+		remove_proc_entry(batt_name, NULL);
+	}
+
+	return 0;
+}