mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
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fa49366b50
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@19505 3c298f89-4303-0410-b956-a3cf2f4a3e73
351 lines
8.7 KiB
C
351 lines
8.7 KiB
C
/*
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* Battery measurement code for Ingenic JZ SOC.
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*
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* Copyright (C) 2009 Jiejing Zhang <kzjeef@gmail.com>
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* Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
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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 <linux/gpio.h>
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#include <linux/interrupt.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 {
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struct jz_battery_platform_data *pdata;
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int charge_irq;
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int status;
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long voltage;
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struct power_supply battery;
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struct delayed_work work;
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};
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static inline struct jz_battery *psy_to_jz_battery(struct power_supply *psy)
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{
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return container_of(psy, struct jz_battery, battery);
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}
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static long jz_battery_read_voltage(struct jz_battery *jz_battery)
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{
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struct device *adc = jz_battery->battery.dev->parent->parent;
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enum jz_adc_battery_scale scale;
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if (jz_battery->pdata->info.voltage_max_design > 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(adc, scale);
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}
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static int jz_battery_get_capacity(struct power_supply *psy)
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{
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struct jz_battery *jz_battery = psy_to_jz_battery(psy);
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struct power_supply_info *info = &jz_battery->pdata->info;
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long voltage;
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int ret;
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int voltage_span;
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voltage = jz_battery_read_voltage(jz_battery);
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if (voltage < 0)
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return voltage;
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voltage_span = info->voltage_max_design - info->voltage_min_design;
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ret = ((voltage - info->voltage_min_design) * 100) / voltage_span;
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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_battery_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 *jz_battery = psy_to_jz_battery(psy);
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struct power_supply_info *info = &jz_battery->pdata->info;
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long voltage;
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switch (psp) {
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case POWER_SUPPLY_PROP_STATUS:
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val->intval = jz_battery->status;
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break;
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case POWER_SUPPLY_PROP_TECHNOLOGY:
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val->intval = jz_battery->pdata->info.technology;
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break;
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case POWER_SUPPLY_PROP_HEALTH:
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voltage = jz_battery_read_voltage(jz_battery);
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if (voltage < info->voltage_min_design)
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val->intval = POWER_SUPPLY_HEALTH_DEAD;
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else
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val->intval = POWER_SUPPLY_HEALTH_GOOD;
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break;
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case POWER_SUPPLY_PROP_CAPACITY:
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val->intval = jz_battery_get_capacity(psy);
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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val->intval = jz_battery_read_voltage(jz_battery);
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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_DESIGN:
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val->intval = info->voltage_max_design;
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
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val->intval = info->voltage_min_design;
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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_battery_external_power_changed(struct power_supply *psy)
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{
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struct jz_battery *jz_battery = psy_to_jz_battery(psy);
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cancel_delayed_work(&jz_battery->work);
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schedule_delayed_work(&jz_battery->work, 0);
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}
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static irqreturn_t jz_battery_charge_irq(int irq, void *data)
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{
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struct jz_battery *jz_battery = data;
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cancel_delayed_work(&jz_battery->work);
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schedule_delayed_work(&jz_battery->work, 0);
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return IRQ_HANDLED;
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}
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static void jz_battery_update(struct jz_battery *jz_battery)
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{
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int status;
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long voltage;
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long voltage_difference;
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bool has_changed = 0;
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if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {
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int is_charging;
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is_charging = gpio_get_value(jz_battery->pdata->gpio_charge);
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is_charging ^= jz_battery->pdata->gpio_charge_active_low;
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if (is_charging)
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status = POWER_SUPPLY_STATUS_CHARGING;
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else
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status = POWER_SUPPLY_STATUS_NOT_CHARGING;
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if (status != jz_battery->status) {
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jz_battery->status = status;
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has_changed = 1;
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}
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}
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voltage = jz_battery_read_voltage(jz_battery);
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voltage_difference = voltage - jz_battery->voltage;
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if (voltage_difference > 50000 || voltage_difference < 50000) {
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jz_battery->voltage = voltage;
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has_changed = 1;
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}
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if (has_changed)
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power_supply_changed(&jz_battery->battery);
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}
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static enum power_supply_property jz_battery_properties[] = {
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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,
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
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POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
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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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static void jz_battery_work(struct work_struct *work)
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{
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/* Too small interval will increase system workload */
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const int interval = HZ * 30;
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struct jz_battery *jz_battery = container_of(work, struct jz_battery,
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work.work);
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jz_battery_update(jz_battery);
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schedule_delayed_work(&jz_battery->work, interval);
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}
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static int jz_battery_probe(struct platform_device *pdev)
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{
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int ret = 0;
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struct jz_battery_platform_data *pdata = pdev->dev.platform_data;
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struct jz_battery *jz_battery;
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struct power_supply *battery;
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if (!pdev->dev.platform_data) {
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dev_err(&pdev->dev, "No platform data\n");
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return -EINVAL;
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}
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jz_battery = kzalloc(sizeof(*jz_battery), GFP_KERNEL);
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if (!jz_battery) {
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dev_err(&pdev->dev, "Failed to allocate driver structure\n");
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return -ENOMEM;
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}
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battery = &jz_battery->battery;
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battery->name = pdata->info.name;
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battery->type = POWER_SUPPLY_TYPE_BATTERY;
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battery->properties = jz_battery_properties;
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battery->num_properties = ARRAY_SIZE(jz_battery_properties);
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battery->get_property = jz_battery_get_property;
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battery->external_power_changed = jz_battery_external_power_changed;
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battery->use_for_apm = 1;
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jz_battery->pdata = pdata;
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INIT_DELAYED_WORK(&jz_battery->work, jz_battery_work);
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if (gpio_is_valid(pdata->gpio_charge)) {
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ret = gpio_request(pdata->gpio_charge, dev_name(&pdev->dev));
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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_free;
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}
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ret = gpio_direction_input(pdata->gpio_charge);
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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_free_gpio;
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}
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jz_battery->charge_irq = gpio_to_irq(pdata->gpio_charge);
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if (jz_battery->charge_irq >= 0) {
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ret = request_irq(jz_battery->charge_irq,
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jz_battery_charge_irq,
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IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
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dev_name(&pdev->dev), jz_battery);
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if (ret) {
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dev_err(&pdev->dev, "Failed to request charge irq: %d\n", ret);
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goto err_free_gpio;
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}
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}
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} else {
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jz_battery->charge_irq = -1;
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}
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ret = power_supply_register(&pdev->dev, &jz_battery->battery);
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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_free_irq;
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}
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platform_set_drvdata(pdev, jz_battery);
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schedule_delayed_work(&jz_battery->work, 0);
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return 0;
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err_free_irq:
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if (jz_battery->charge_irq >= 0)
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free_irq(jz_battery->charge_irq, jz_battery);
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err_free_gpio:
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if (gpio_is_valid(pdata->gpio_charge))
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gpio_free(jz_battery->pdata->gpio_charge);
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err_free:
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kfree(jz_battery);
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return ret;
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}
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static int jz_battery_remove(struct platform_device *pdev)
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{
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struct jz_battery *jz_battery = platform_get_drvdata(pdev);
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cancel_delayed_work_sync(&jz_battery->work);
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if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {
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if (jz_battery->charge_irq >= 0)
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free_irq(jz_battery->charge_irq, jz_battery);
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gpio_free(jz_battery->pdata->gpio_charge);
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}
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power_supply_unregister(&jz_battery->battery);
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return 0;
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}
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#ifdef CONFIG_PM
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static int jz_battery_suspend(struct platform_device *pdev, pm_message_t state)
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{
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struct jz_battery *jz_battery = platform_get_drvdata(pdev);
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cancel_delayed_work_sync(&jz_battery->work);
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jz_battery->status = POWER_SUPPLY_STATUS_UNKNOWN;
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return 0;
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}
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static int jz_battery_resume(struct platform_device *pdev)
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{
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struct jz_battery *jz_battery = platform_get_drvdata(pdev);
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schedule_delayed_work(&jz_battery->work, 0);
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return 0;
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}
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#else
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#define jz_battery_suspend NULL
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#define jz_battery_resume NULL
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#endif
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static struct platform_driver jz_battery_driver = {
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.probe = jz_battery_probe,
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.remove = __devexit_p(jz_battery_remove),
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.suspend = jz_battery_suspend,
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.resume = jz_battery_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_battery_init(void)
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{
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return platform_driver_register(&jz_battery_driver);
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}
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module_init(jz_battery_init);
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static void __exit jz_battery_exit(void)
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{
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platform_driver_unregister(&jz_battery_driver);
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}
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module_exit(jz_battery_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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