diff options
Diffstat (limited to 'drivers/macintosh/apm_emu.c')
| -rw-r--r-- | drivers/macintosh/apm_emu.c | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/drivers/macintosh/apm_emu.c b/drivers/macintosh/apm_emu.c new file mode 100644 index 0000000000..5ed0ac65cf --- /dev/null +++ b/drivers/macintosh/apm_emu.c @@ -0,0 +1,108 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * APM emulation for PMU-based machines + * + * Copyright 2001 Benjamin Herrenschmidt (benh@kernel.crashing.org) + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/apm-emulation.h> +#include <linux/adb.h> +#include <linux/pmu.h> + +#define APM_CRITICAL 10 +#define APM_LOW 30 + +static void pmu_apm_get_power_status(struct apm_power_info *info) +{ + int percentage = -1; + int batteries = 0; + int time_units = -1; + int real_count = 0; + int i; + char charging = 0; + long charge = -1; + long amperage = 0; + unsigned long btype = 0; + + info->battery_status = APM_BATTERY_STATUS_UNKNOWN; + info->battery_flag = APM_BATTERY_FLAG_UNKNOWN; + info->units = APM_UNITS_MINS; + + if (pmu_power_flags & PMU_PWR_AC_PRESENT) + info->ac_line_status = APM_AC_ONLINE; + else + info->ac_line_status = APM_AC_OFFLINE; + + for (i=0; i<pmu_battery_count; i++) { + if (pmu_batteries[i].flags & PMU_BATT_PRESENT) { + batteries++; + if (percentage < 0) + percentage = 0; + if (charge < 0) + charge = 0; + percentage += (pmu_batteries[i].charge * 100) / + pmu_batteries[i].max_charge; + charge += pmu_batteries[i].charge; + amperage += pmu_batteries[i].amperage; + if (btype == 0) + btype = (pmu_batteries[i].flags & PMU_BATT_TYPE_MASK); + real_count++; + if ((pmu_batteries[i].flags & PMU_BATT_CHARGING)) + charging++; + } + } + if (batteries == 0) + info->ac_line_status = APM_AC_ONLINE; + + if (real_count) { + if (amperage < 0) { + if (btype == PMU_BATT_TYPE_SMART) + time_units = (charge * 59) / (amperage * -1); + else + time_units = (charge * 16440) / (amperage * -60); + } + percentage /= real_count; + if (charging > 0) { + info->battery_status = APM_BATTERY_STATUS_CHARGING; + info->battery_flag = APM_BATTERY_FLAG_CHARGING; + } else if (percentage <= APM_CRITICAL) { + info->battery_status = APM_BATTERY_STATUS_CRITICAL; + info->battery_flag = APM_BATTERY_FLAG_CRITICAL; + } else if (percentage <= APM_LOW) { + info->battery_status = APM_BATTERY_STATUS_LOW; + info->battery_flag = APM_BATTERY_FLAG_LOW; + } else { + info->battery_status = APM_BATTERY_STATUS_HIGH; + info->battery_flag = APM_BATTERY_FLAG_HIGH; + } + } + + info->battery_life = percentage; + info->time = time_units; +} + +static int __init apm_emu_init(void) +{ + apm_get_power_status = pmu_apm_get_power_status; + + printk(KERN_INFO "apm_emu: PMU APM Emulation initialized.\n"); + + return 0; +} + +static void __exit apm_emu_exit(void) +{ + if (apm_get_power_status == pmu_apm_get_power_status) + apm_get_power_status = NULL; + + printk(KERN_INFO "apm_emu: PMU APM Emulation removed.\n"); +} + +module_init(apm_emu_init); +module_exit(apm_emu_exit); + +MODULE_AUTHOR("Benjamin Herrenschmidt"); +MODULE_DESCRIPTION("APM emulation for PowerMac"); +MODULE_LICENSE("GPL"); |