1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * bios-less APM driver for hp680 4 * 5 * Copyright 2005 (c) Andriy Skulysh <askulysh@gmail.com> 6 * Copyright 2008 (c) Kristoffer Ericson <kristoffer.ericson@gmail.com> 7 */ 8 #include <linux/module.h> 9 #include <linux/kernel.h> 10 #include <linux/init.h> 11 #include <linux/interrupt.h> 12 #include <linux/apm-emulation.h> 13 #include <linux/io.h> 14 #include <asm/adc.h> 15 #include <mach/hp6xx.h> 16 17 /* percentage values */ 18 #define APM_CRITICAL 10 19 #define APM_LOW 30 20 21 /* resonably sane values */ 22 #define HP680_BATTERY_MAX 898 23 #define HP680_BATTERY_MIN 486 24 #define HP680_BATTERY_AC_ON 1023 25 26 #define MODNAME "hp6x0_apm" 27 28 #define PGDR 0xa400012c 29 30 static void hp6x0_apm_get_power_status(struct apm_power_info *info) 31 { 32 int battery, backup, charging, percentage; 33 u8 pgdr; 34 35 battery = adc_single(ADC_CHANNEL_BATTERY); 36 backup = adc_single(ADC_CHANNEL_BACKUP); 37 charging = adc_single(ADC_CHANNEL_CHARGE); 38 39 percentage = 100 * (battery - HP680_BATTERY_MIN) / 40 (HP680_BATTERY_MAX - HP680_BATTERY_MIN); 41 42 /* % of full battery */ 43 info->battery_life = percentage; 44 45 /* We want our estimates in minutes */ 46 info->units = 0; 47 48 /* Extremely(!!) rough estimate, we will replace this with a datalist later on */ 49 info->time = (2 * battery); 50 51 info->ac_line_status = (battery > HP680_BATTERY_AC_ON) ? 52 APM_AC_ONLINE : APM_AC_OFFLINE; 53 54 pgdr = __raw_readb(PGDR); 55 if (pgdr & PGDR_MAIN_BATTERY_OUT) { 56 info->battery_status = APM_BATTERY_STATUS_NOT_PRESENT; 57 info->battery_flag = 0x80; 58 } else if (charging < 8) { 59 info->battery_status = APM_BATTERY_STATUS_CHARGING; 60 info->battery_flag = 0x08; 61 info->ac_line_status = 0x01; 62 } else if (percentage <= APM_CRITICAL) { 63 info->battery_status = APM_BATTERY_STATUS_CRITICAL; 64 info->battery_flag = 0x04; 65 } else if (percentage <= APM_LOW) { 66 info->battery_status = APM_BATTERY_STATUS_LOW; 67 info->battery_flag = 0x02; 68 } else { 69 info->battery_status = APM_BATTERY_STATUS_HIGH; 70 info->battery_flag = 0x01; 71 } 72 } 73 74 static irqreturn_t hp6x0_apm_interrupt(int irq, void *dev) 75 { 76 if (!APM_DISABLED) 77 apm_queue_event(APM_USER_SUSPEND); 78 79 return IRQ_HANDLED; 80 } 81 82 static int __init hp6x0_apm_init(void) 83 { 84 int ret; 85 86 ret = request_irq(HP680_BTN_IRQ, hp6x0_apm_interrupt, 87 0, MODNAME, NULL); 88 if (unlikely(ret < 0)) { 89 printk(KERN_ERR MODNAME ": IRQ %d request failed\n", 90 HP680_BTN_IRQ); 91 return ret; 92 } 93 94 apm_get_power_status = hp6x0_apm_get_power_status; 95 96 return ret; 97 } 98 99 static void __exit hp6x0_apm_exit(void) 100 { 101 free_irq(HP680_BTN_IRQ, 0); 102 } 103 104 module_init(hp6x0_apm_init); 105 module_exit(hp6x0_apm_exit); 106 107 MODULE_AUTHOR("Adriy Skulysh"); 108 MODULE_DESCRIPTION("hp6xx Advanced Power Management"); 109 MODULE_LICENSE("GPL"); 110