| Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [diff] [blame^] | 1 | /* |
| 2 | * bios-less APM driver for hp680 |
| 3 | * |
| 4 | * Copyright 2005 (c) Andriy Skulysh <askulysh@gmail.com> |
| 5 | * Copyright 2008 (c) Kristoffer Ericson <kristoffer.ericson@gmail.com> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License. |
| 9 | */ |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/init.h> |
| 13 | #include <linux/interrupt.h> |
| 14 | #include <linux/apm-emulation.h> |
| 15 | #include <linux/io.h> |
| 16 | #include <asm/adc.h> |
| 17 | #include <mach/hp6xx.h> |
| 18 | |
| 19 | /* percentage values */ |
| 20 | #define APM_CRITICAL 10 |
| 21 | #define APM_LOW 30 |
| 22 | |
| 23 | /* resonably sane values */ |
| 24 | #define HP680_BATTERY_MAX 898 |
| 25 | #define HP680_BATTERY_MIN 486 |
| 26 | #define HP680_BATTERY_AC_ON 1023 |
| 27 | |
| 28 | #define MODNAME "hp6x0_apm" |
| 29 | |
| 30 | #define PGDR 0xa400012c |
| 31 | |
| 32 | static void hp6x0_apm_get_power_status(struct apm_power_info *info) |
| 33 | { |
| 34 | int battery, backup, charging, percentage; |
| 35 | u8 pgdr; |
| 36 | |
| 37 | battery = adc_single(ADC_CHANNEL_BATTERY); |
| 38 | backup = adc_single(ADC_CHANNEL_BACKUP); |
| 39 | charging = adc_single(ADC_CHANNEL_CHARGE); |
| 40 | |
| 41 | percentage = 100 * (battery - HP680_BATTERY_MIN) / |
| 42 | (HP680_BATTERY_MAX - HP680_BATTERY_MIN); |
| 43 | |
| 44 | /* % of full battery */ |
| 45 | info->battery_life = percentage; |
| 46 | |
| 47 | /* We want our estimates in minutes */ |
| 48 | info->units = 0; |
| 49 | |
| 50 | /* Extremely(!!) rough estimate, we will replace this with a datalist later on */ |
| 51 | info->time = (2 * battery); |
| 52 | |
| 53 | info->ac_line_status = (battery > HP680_BATTERY_AC_ON) ? |
| 54 | APM_AC_ONLINE : APM_AC_OFFLINE; |
| 55 | |
| 56 | pgdr = __raw_readb(PGDR); |
| 57 | if (pgdr & PGDR_MAIN_BATTERY_OUT) { |
| 58 | info->battery_status = APM_BATTERY_STATUS_NOT_PRESENT; |
| 59 | info->battery_flag = 0x80; |
| 60 | } else if (charging < 8) { |
| 61 | info->battery_status = APM_BATTERY_STATUS_CHARGING; |
| 62 | info->battery_flag = 0x08; |
| 63 | info->ac_line_status = 0x01; |
| 64 | } else if (percentage <= APM_CRITICAL) { |
| 65 | info->battery_status = APM_BATTERY_STATUS_CRITICAL; |
| 66 | info->battery_flag = 0x04; |
| 67 | } else if (percentage <= APM_LOW) { |
| 68 | info->battery_status = APM_BATTERY_STATUS_LOW; |
| 69 | info->battery_flag = 0x02; |
| 70 | } else { |
| 71 | info->battery_status = APM_BATTERY_STATUS_HIGH; |
| 72 | info->battery_flag = 0x01; |
| 73 | } |
| 74 | } |
| 75 | |
| 76 | static irqreturn_t hp6x0_apm_interrupt(int irq, void *dev) |
| 77 | { |
| 78 | if (!APM_DISABLED) |
| 79 | apm_queue_event(APM_USER_SUSPEND); |
| 80 | |
| 81 | return IRQ_HANDLED; |
| 82 | } |
| 83 | |
| 84 | static int __init hp6x0_apm_init(void) |
| 85 | { |
| 86 | int ret; |
| 87 | |
| 88 | ret = request_irq(HP680_BTN_IRQ, hp6x0_apm_interrupt, |
| 89 | 0, MODNAME, NULL); |
| 90 | if (unlikely(ret < 0)) { |
| 91 | printk(KERN_ERR MODNAME ": IRQ %d request failed\n", |
| 92 | HP680_BTN_IRQ); |
| 93 | return ret; |
| 94 | } |
| 95 | |
| 96 | apm_get_power_status = hp6x0_apm_get_power_status; |
| 97 | |
| 98 | return ret; |
| 99 | } |
| 100 | |
| 101 | static void __exit hp6x0_apm_exit(void) |
| 102 | { |
| 103 | free_irq(HP680_BTN_IRQ, 0); |
| 104 | } |
| 105 | |
| 106 | module_init(hp6x0_apm_init); |
| 107 | module_exit(hp6x0_apm_exit); |
| 108 | |
| 109 | MODULE_AUTHOR("Adriy Skulysh"); |
| 110 | MODULE_DESCRIPTION("hp6xx Advanced Power Management"); |
| 111 | MODULE_LICENSE("GPL"); |