332 lines
8.6 KiB
C
332 lines
8.6 KiB
C
/*
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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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* Copyright (C) 2009 Jiejing Zhang <kzjeef@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 <linux/gpio.h>
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#include <linux/power/jz4740-battery.h>
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#include <linux/jz4740-adc.h>
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struct jz_battery_info {
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struct power_supply bat;
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int bat_status;
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struct jz_batt_info *pdata;
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struct mutex work_lock;
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struct workqueue_struct *monitor_wqueue;
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struct delayed_work bat_work;
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};
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#define ps_to_jz_battery(x) container_of((x), struct jz_battery_info, bat);
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/*********************************************************************
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* Battery properties
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*********************************************************************/
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static long jz_read_bat(struct power_supply *psy)
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{
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struct jz_battery_info *bat_info = ps_to_jz_battery(psy);
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enum jz_adc_battery_scale scale;
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if (bat_info->pdata->max_voltag > 2500000)
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scale = JZ_ADC_BATTERY_SCALE_7V5;
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else
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scale = JZ_ADC_BATTERY_SCALE_2V5;
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return jz4740_adc_read_battery_voltage(psy->dev->parent->parent, scale);
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}
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static int jz_bat_get_capacity(struct power_supply *psy)
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{
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int ret;
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struct jz_battery_info *bat_info = ps_to_jz_battery(psy);
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ret = jz_read_bat(psy);
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if (ret < 0)
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return ret;
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ret = (ret - bat_info->pdata->min_voltag) * 100
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/ (bat_info->pdata->max_voltag - bat_info->pdata->min_voltag);
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if (ret > 100)
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ret = 100;
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else if (ret < 0)
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ret = 0;
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return ret;
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}
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static int jz_bat_get_property(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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struct jz_battery_info *bat_info = ps_to_jz_battery(psy)
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switch (psp) {
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case POWER_SUPPLY_PROP_STATUS:
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val->intval = bat_info->bat_status;
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break;
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case POWER_SUPPLY_PROP_TECHNOLOGY:
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val->intval = bat_info->pdata->batt_tech;
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break;
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case POWER_SUPPLY_PROP_HEALTH:
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if(jz_read_bat(psy) < bat_info->pdata->min_voltag) {
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dev_dbg(psy->dev, "%s: battery is dead,"
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"voltage too low!\n", __func__);
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val->intval = POWER_SUPPLY_HEALTH_DEAD;
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} else {
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dev_dbg(psy->dev, "%s: battery is good,"
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"voltage normal.\n", __func__);
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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_bat_get_capacity(psy);
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dev_dbg(psy->dev, "%s: battery_capacity = %d\n",
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__func__, 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(psy);
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if (val->intval < 0)
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return val->intval;
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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 = bat_info->pdata->max_voltag;
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
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val->intval = bat_info->pdata->min_voltag;
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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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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 *psy)
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{
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struct jz_battery_info *bat_info = ps_to_jz_battery(psy);
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cancel_delayed_work(&bat_info->bat_work);
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queue_delayed_work(bat_info->monitor_wqueue, &bat_info->bat_work, HZ / 8);
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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 *psy)
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{
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struct jz_battery_info *bat_info = ps_to_jz_battery(psy);
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int old_status = bat_info->bat_status;
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static unsigned long old_batt_vol = 0;
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unsigned long batt_vol = jz_read_bat(psy);
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mutex_lock(&bat_info->work_lock);
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if (gpio_is_valid(bat_info->pdata->charg_stat_gpio)) {
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if(!gpio_get_value(bat_info->pdata->charg_stat_gpio))
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bat_info->bat_status = POWER_SUPPLY_STATUS_CHARGING;
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else
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bat_info->bat_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
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dev_dbg(psy->dev, "%s: battery status=%s\n",
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__func__, status_text[bat_info->bat_status]);
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if (old_status != bat_info->bat_status) {
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dev_dbg(psy->dev, "%s %s -> %s\n",
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psy->name,
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status_text[old_status],
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status_text[bat_info->bat_status]);
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power_supply_changed(psy);
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}
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}
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if (old_batt_vol - batt_vol > 50000) {
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dev_dbg(psy->dev, "voltage change : %ld -> %ld\n",
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old_batt_vol, batt_vol);
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power_supply_changed(psy);
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old_batt_vol = batt_vol;
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}
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mutex_unlock(&bat_info->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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};
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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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/* query interval too small will increase system workload*/
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const int interval = HZ * 30;
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struct jz_battery_info *bat_info = container_of(work,struct jz_battery_info, bat_work.work);
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jz_bat_update(&bat_info->bat);
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queue_delayed_work(bat_info->monitor_wqueue,
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&bat_info->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 *pdev, pm_message_t state)
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{
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struct jz_battery_info *bat_info = platform_get_drvdata(pdev);
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bat_info->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 *pdev)
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{
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struct jz_battery_info *bat_info = platform_get_drvdata(pdev);
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bat_info->bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
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cancel_delayed_work(&bat_info->bat_work);
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queue_delayed_work(bat_info->monitor_wqueue, &bat_info->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 jz_bat_probe(struct platform_device *pdev)
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{
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int ret = 0;
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struct jz_battery_info *bat_info;
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if (!pdev->dev.platform_data) {
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dev_err(&pdev->dev, "Please set battery info\n");
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return -EINVAL;
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}
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bat_info = kzalloc(sizeof(struct jz_battery_info), GFP_KERNEL);
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if (!bat_info) {
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return -ENOMEM;
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}
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platform_set_drvdata(pdev, bat_info);
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bat_info->pdata = pdev->dev.platform_data;
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bat_info->bat = bat_ps;
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mutex_init(&bat_info->work_lock);
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INIT_DELAYED_WORK(&bat_info->bat_work, jz_bat_work);
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if (gpio_is_valid(bat_info->pdata->charg_stat_gpio)) {
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ret = gpio_request(bat_info->pdata->charg_stat_gpio, "CHARG STAT");
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if (ret) {
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dev_err(&pdev->dev, "charger state gpio request failed.\n");
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goto err_charg_gpio_request;
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}
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ret = gpio_direction_input(bat_info->pdata->charg_stat_gpio);
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if (ret) {
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dev_err(&pdev->dev, "charger state gpio set direction failed.\n");
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goto err_charg_gpio_direction;
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}
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ret = power_supply_register(&pdev->dev, &bat_info->bat);
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if (ret) {
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dev_err(&pdev->dev, "power supply battery register failed.\n");
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goto err_power_register_bat;
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} else {
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bat_info->monitor_wqueue = create_singlethread_workqueue("jz_battery");
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if (!bat_info->monitor_wqueue) {
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return -ESRCH;
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}
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queue_delayed_work(bat_info->monitor_wqueue, &bat_info->bat_work, HZ * 1);
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}
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}
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printk(KERN_INFO "jz_bat init success.\n");
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return ret;
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err_power_register_bat:
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err_charg_gpio_direction:
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gpio_free(bat_info->pdata->charg_stat_gpio);
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err_charg_gpio_request:
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kfree(bat_info);
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return ret;
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}
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static int jz_bat_remove(struct platform_device *pdev)
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{
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struct jz_battery_info *bat_info = platform_get_drvdata(pdev);
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if (bat_info->pdata) {
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if (gpio_is_valid(bat_info->pdata->charg_stat_gpio))
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gpio_free(bat_info->pdata->charg_stat_gpio);
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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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.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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.driver = {
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.name = "jz4740-battery",
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.owner = THIS_MODULE,
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},
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};
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static int __init jz_bat_init(void)
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{
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return platform_driver_register(&jz_bat_driver);
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}
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module_init(jz_bat_init);
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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_exit(jz_bat_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Jiejing Zhang <kzjeef@gmail.com>");
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MODULE_DESCRIPTION("JZ4720/JZ4740 SoC battery driver");
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