1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * bios-less APM driver for hp680
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright 2005 (c) Andriy Skulysh <askulysh@gmail.com>
6*4882a593Smuzhiyun * Copyright 2008 (c) Kristoffer Ericson <kristoffer.ericson@gmail.com>
7*4882a593Smuzhiyun */
8*4882a593Smuzhiyun #include <linux/module.h>
9*4882a593Smuzhiyun #include <linux/kernel.h>
10*4882a593Smuzhiyun #include <linux/init.h>
11*4882a593Smuzhiyun #include <linux/interrupt.h>
12*4882a593Smuzhiyun #include <linux/apm-emulation.h>
13*4882a593Smuzhiyun #include <linux/io.h>
14*4882a593Smuzhiyun #include <asm/adc.h>
15*4882a593Smuzhiyun #include <mach/hp6xx.h>
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun /* percentage values */
18*4882a593Smuzhiyun #define APM_CRITICAL 10
19*4882a593Smuzhiyun #define APM_LOW 30
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun /* resonably sane values */
22*4882a593Smuzhiyun #define HP680_BATTERY_MAX 898
23*4882a593Smuzhiyun #define HP680_BATTERY_MIN 486
24*4882a593Smuzhiyun #define HP680_BATTERY_AC_ON 1023
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun #define MODNAME "hp6x0_apm"
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun #define PGDR 0xa400012c
29*4882a593Smuzhiyun
hp6x0_apm_get_power_status(struct apm_power_info * info)30*4882a593Smuzhiyun static void hp6x0_apm_get_power_status(struct apm_power_info *info)
31*4882a593Smuzhiyun {
32*4882a593Smuzhiyun int battery, backup, charging, percentage;
33*4882a593Smuzhiyun u8 pgdr;
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun battery = adc_single(ADC_CHANNEL_BATTERY);
36*4882a593Smuzhiyun backup = adc_single(ADC_CHANNEL_BACKUP);
37*4882a593Smuzhiyun charging = adc_single(ADC_CHANNEL_CHARGE);
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun percentage = 100 * (battery - HP680_BATTERY_MIN) /
40*4882a593Smuzhiyun (HP680_BATTERY_MAX - HP680_BATTERY_MIN);
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun /* % of full battery */
43*4882a593Smuzhiyun info->battery_life = percentage;
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun /* We want our estimates in minutes */
46*4882a593Smuzhiyun info->units = 0;
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun /* Extremely(!!) rough estimate, we will replace this with a datalist later on */
49*4882a593Smuzhiyun info->time = (2 * battery);
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun info->ac_line_status = (battery > HP680_BATTERY_AC_ON) ?
52*4882a593Smuzhiyun APM_AC_ONLINE : APM_AC_OFFLINE;
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun pgdr = __raw_readb(PGDR);
55*4882a593Smuzhiyun if (pgdr & PGDR_MAIN_BATTERY_OUT) {
56*4882a593Smuzhiyun info->battery_status = APM_BATTERY_STATUS_NOT_PRESENT;
57*4882a593Smuzhiyun info->battery_flag = 0x80;
58*4882a593Smuzhiyun } else if (charging < 8) {
59*4882a593Smuzhiyun info->battery_status = APM_BATTERY_STATUS_CHARGING;
60*4882a593Smuzhiyun info->battery_flag = 0x08;
61*4882a593Smuzhiyun info->ac_line_status = 0x01;
62*4882a593Smuzhiyun } else if (percentage <= APM_CRITICAL) {
63*4882a593Smuzhiyun info->battery_status = APM_BATTERY_STATUS_CRITICAL;
64*4882a593Smuzhiyun info->battery_flag = 0x04;
65*4882a593Smuzhiyun } else if (percentage <= APM_LOW) {
66*4882a593Smuzhiyun info->battery_status = APM_BATTERY_STATUS_LOW;
67*4882a593Smuzhiyun info->battery_flag = 0x02;
68*4882a593Smuzhiyun } else {
69*4882a593Smuzhiyun info->battery_status = APM_BATTERY_STATUS_HIGH;
70*4882a593Smuzhiyun info->battery_flag = 0x01;
71*4882a593Smuzhiyun }
72*4882a593Smuzhiyun }
73*4882a593Smuzhiyun
hp6x0_apm_interrupt(int irq,void * dev)74*4882a593Smuzhiyun static irqreturn_t hp6x0_apm_interrupt(int irq, void *dev)
75*4882a593Smuzhiyun {
76*4882a593Smuzhiyun if (!APM_DISABLED)
77*4882a593Smuzhiyun apm_queue_event(APM_USER_SUSPEND);
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun return IRQ_HANDLED;
80*4882a593Smuzhiyun }
81*4882a593Smuzhiyun
hp6x0_apm_init(void)82*4882a593Smuzhiyun static int __init hp6x0_apm_init(void)
83*4882a593Smuzhiyun {
84*4882a593Smuzhiyun int ret;
85*4882a593Smuzhiyun
86*4882a593Smuzhiyun ret = request_irq(HP680_BTN_IRQ, hp6x0_apm_interrupt,
87*4882a593Smuzhiyun 0, MODNAME, NULL);
88*4882a593Smuzhiyun if (unlikely(ret < 0)) {
89*4882a593Smuzhiyun printk(KERN_ERR MODNAME ": IRQ %d request failed\n",
90*4882a593Smuzhiyun HP680_BTN_IRQ);
91*4882a593Smuzhiyun return ret;
92*4882a593Smuzhiyun }
93*4882a593Smuzhiyun
94*4882a593Smuzhiyun apm_get_power_status = hp6x0_apm_get_power_status;
95*4882a593Smuzhiyun
96*4882a593Smuzhiyun return ret;
97*4882a593Smuzhiyun }
98*4882a593Smuzhiyun
hp6x0_apm_exit(void)99*4882a593Smuzhiyun static void __exit hp6x0_apm_exit(void)
100*4882a593Smuzhiyun {
101*4882a593Smuzhiyun free_irq(HP680_BTN_IRQ, 0);
102*4882a593Smuzhiyun }
103*4882a593Smuzhiyun
104*4882a593Smuzhiyun module_init(hp6x0_apm_init);
105*4882a593Smuzhiyun module_exit(hp6x0_apm_exit);
106*4882a593Smuzhiyun
107*4882a593Smuzhiyun MODULE_AUTHOR("Adriy Skulysh");
108*4882a593Smuzhiyun MODULE_DESCRIPTION("hp6xx Advanced Power Management");
109*4882a593Smuzhiyun MODULE_LICENSE("GPL");
110