mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-12-11 11:55:20 +02:00
dc3d3f1c49
it's basically also provided by ingenic and nativly based on 2.6.27, adjusted to fit into the OpenWrt-environment
299 lines
7.3 KiB
C
Executable File
299 lines
7.3 KiB
C
Executable File
/*
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* linux/drivers/power/jz_battery
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*
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* Battery measurement code for Ingenic JZ SOC.
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*
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* based on tosa_battery.c
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*
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* Copyright (C) 2008 Marek Vasut <marek.vasut@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/power_supply.h>
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#include <linux/delay.h>
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#include <linux/spinlock.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <asm/jzsoc.h>
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#ifdef CONFIG_POWER_SUPPLY_DEBUG
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#define dprintk(x...) printk(x)
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#else
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#define dprintk(x...) while(0){}
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#endif
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#define JZ_BAT_MAX_VOLTAGE 4200000 // uV
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#define JZ_BAT_MIN_VOLTAGE 3600000
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static DEFINE_MUTEX(bat_lock);
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struct workqueue_struct *monitor_wqueue;
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struct delayed_work bat_work;
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struct mutex work_lock;
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int bat_status = POWER_SUPPLY_STATUS_DISCHARGING;
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extern unsigned int jz_read_battery(void);
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/*********************************************************************
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* Power
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*********************************************************************/
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static int jz_get_power_prop(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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switch (psp) {
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case POWER_SUPPLY_PROP_ONLINE:
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if (psy->type == POWER_SUPPLY_TYPE_MAINS)
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val->intval = !__gpio_get_pin(GPIO_DC_DETE_N);
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else
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val->intval = __gpio_get_pin(GPIO_USB_DETE);
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static enum power_supply_property jz_power_props[] = {
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POWER_SUPPLY_PROP_ONLINE,
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};
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static struct power_supply jz_ac = {
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.name = "ac",
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.type = POWER_SUPPLY_TYPE_MAINS,
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.properties = jz_power_props,
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.num_properties = ARRAY_SIZE(jz_power_props),
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.get_property = jz_get_power_prop,
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};
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static struct power_supply jz_usb = {
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.name = "usb",
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.type = POWER_SUPPLY_TYPE_USB,
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.properties = jz_power_props,
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.num_properties = ARRAY_SIZE(jz_power_props),
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.get_property = jz_get_power_prop,
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};
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/*********************************************************************
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* Battery properties
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*********************************************************************/
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static unsigned long jz_read_bat(struct power_supply *bat_ps)
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{
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unsigned long val;
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if (CFG_PBAT_DIV == 1)
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val = (((unsigned long long)jz_read_battery() * 7500000)) >> 12;
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else
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val = (((unsigned long long)jz_read_battery() * CFG_PBAT_DIV * 2500000)) >> 12;
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dprintk("--raw_batter_vol=%d uV\n", val);
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return val;
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}
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static int jz_bat_get_property(struct power_supply *bat_ps,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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switch (psp) {
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case POWER_SUPPLY_PROP_STATUS:
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val->intval = bat_status;
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break;
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case POWER_SUPPLY_PROP_TECHNOLOGY:
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val->intval = POWER_SUPPLY_TECHNOLOGY_LIPO;
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break;
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case POWER_SUPPLY_PROP_HEALTH:
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if(jz_read_bat(bat_ps) < 3600000) {
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dprintk("--battery dead\n");
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val->intval = POWER_SUPPLY_HEALTH_DEAD;
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} else {
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dprintk("--battery good\n");
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val->intval = POWER_SUPPLY_HEALTH_GOOD;
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}
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break;
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case POWER_SUPPLY_PROP_CAPACITY:
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val->intval = (jz_read_bat(bat_ps) - 3600000) * 100 / (4200000 - 3600000);
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if (val->intval > 100)
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val->intval = 100;
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dprintk("--battery_capacity=%d\%\n",val->intval);
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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val->intval = jz_read_bat(bat_ps);
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_MAX:
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case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
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val->intval = JZ_BAT_MAX_VOLTAGE;
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
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val->intval = JZ_BAT_MIN_VOLTAGE;
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break;
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case POWER_SUPPLY_PROP_PRESENT:
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val->intval = 1;
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break;
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case POWER_SUPPLY_PROP_TEMP:
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case POWER_SUPPLY_PROP_VOL:
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val->intval = 0; // reading TEMP and VOL aren't supported
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static void jz_bat_external_power_changed(struct power_supply *bat_ps)
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{
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cancel_delayed_work(&bat_work);
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queue_delayed_work(monitor_wqueue, &bat_work, HZ/10);
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}
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static char *status_text[] = {
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[POWER_SUPPLY_STATUS_UNKNOWN] = "Unknown",
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[POWER_SUPPLY_STATUS_CHARGING] = "Charging",
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[POWER_SUPPLY_STATUS_DISCHARGING] = "Discharging",
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[POWER_SUPPLY_STATUS_NOT_CHARGING] = "Not charging",
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};
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static void jz_bat_update(struct power_supply *bat_ps)
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{
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int old_status = bat_status;
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static unsigned long old_batt_vol = 0;
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unsigned long batt_vol = jz_read_bat(bat_ps);
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mutex_lock(&work_lock);
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if(!__gpio_get_pin(GPIO_CHARG_STAT_N))
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bat_status = POWER_SUPPLY_STATUS_CHARGING;
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else {
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bat_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
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}
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dprintk("--battery status=%s\n", status_text[bat_status]);
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if ((old_status != bat_status) ||
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(old_batt_vol - batt_vol > 50000)) {
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pr_debug("%s %s -> %s\n", bat_ps->name,
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status_text[old_status],
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status_text[bat_status]);
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power_supply_changed(bat_ps);
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}
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old_batt_vol = batt_vol;
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mutex_unlock(&work_lock);
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}
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static enum power_supply_property jz_bat_main_props[] = {
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POWER_SUPPLY_PROP_STATUS,
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POWER_SUPPLY_PROP_TECHNOLOGY,
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POWER_SUPPLY_PROP_HEALTH,
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POWER_SUPPLY_PROP_CAPACITY, /* in percents! */
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
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POWER_SUPPLY_PROP_VOLTAGE_MAX,
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POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
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POWER_SUPPLY_PROP_PRESENT,
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POWER_SUPPLY_PROP_TEMP,
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POWER_SUPPLY_PROP_VOL,
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};
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struct power_supply bat_ps = {
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.name = "battery",
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.type = POWER_SUPPLY_TYPE_BATTERY,
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.properties = jz_bat_main_props,
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.num_properties = ARRAY_SIZE(jz_bat_main_props),
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.get_property = jz_bat_get_property,
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.external_power_changed = jz_bat_external_power_changed,
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.use_for_apm = 1,
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};
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static void jz_bat_work(struct work_struct *work)
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{
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const int interval = HZ * 6;
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jz_bat_update(&bat_ps);
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queue_delayed_work(monitor_wqueue, &bat_work, interval);
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}
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#ifdef CONFIG_PM
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static int jz_bat_suspend(struct platform_device *dev, pm_message_t state)
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{
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bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
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return 0;
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}
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static int jz_bat_resume(struct platform_device *dev)
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{
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bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
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cancel_delayed_work(&bat_work);
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queue_delayed_work(monitor_wqueue, &bat_work, HZ/10);
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return 0;
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}
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#else
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#define jz_bat_suspend NULL
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#define jz_bat_resume NULL
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#endif
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static int __devinit jz_bat_probe(struct platform_device *dev)
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{
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int ret = 0;
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printk("JZ battery init.\n");
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mutex_init(&work_lock);
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INIT_DELAYED_WORK(&bat_work, jz_bat_work);
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__gpio_disable_pull(GPIO_USB_DETE);
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power_supply_register(&dev->dev, &jz_ac);
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power_supply_register(&dev->dev, &jz_usb);
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ret = power_supply_register(&dev->dev, &bat_ps);
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if (!ret) {
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monitor_wqueue = create_singlethread_workqueue("jz_battery");
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if (!monitor_wqueue) {
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return -ESRCH;
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}
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queue_delayed_work(monitor_wqueue, &bat_work, HZ * 1);
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}
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return ret;
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}
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static int __devexit jz_bat_remove(struct platform_device *dev)
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{
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power_supply_unregister(&bat_ps);
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return 0;
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}
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static struct platform_driver jz_bat_driver = {
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.driver.name = "jz-battery",
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.driver.owner = THIS_MODULE,
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.probe = jz_bat_probe,
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.remove = __devexit_p(jz_bat_remove),
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.suspend = jz_bat_suspend,
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.resume = jz_bat_resume,
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};
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static int __init jz_bat_init(void)
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{
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platform_device_register_simple("jz-battery", 0, NULL, 0);
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return platform_driver_register(&jz_bat_driver);
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}
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static void __exit jz_bat_exit(void)
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{
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platform_driver_unregister(&jz_bat_driver);
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}
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module_init(jz_bat_init);
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module_exit(jz_bat_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
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MODULE_DESCRIPTION("Palm T|X battery driver");
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