/* * 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 2000-11-15 * - added proc battery interface * - parse returned data from _BST and _BIF * Andy Grover 2000-12-8 * - improved proc interface */ #include #include #include #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; }