447 lines
11 KiB
C
447 lines
11 KiB
C
/*
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* Battery and Power Management code for the Sharp SL-6000x
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*
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* Copyright (c) 2005 Dirk Opfer
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* Copyright (c) 2008 Dmitry Baryshkov
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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/wm97xx.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/gpio.h>
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#include <asm/mach-types.h>
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#include <mach/tosa.h>
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static DEFINE_MUTEX(bat_lock); /* protects gpio pins */
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static struct work_struct bat_work;
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struct tosa_bat {
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int status;
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struct power_supply psy;
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int full_chrg;
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struct mutex work_lock; /* protects data */
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bool (*is_present)(struct tosa_bat *bat);
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int gpio_full;
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int gpio_charge_off;
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int technology;
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int gpio_bat;
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int adc_bat;
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int adc_bat_divider;
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int bat_max;
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int bat_min;
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int gpio_temp;
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int adc_temp;
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int adc_temp_divider;
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};
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static struct tosa_bat tosa_bat_main;
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static struct tosa_bat tosa_bat_jacket;
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static unsigned long tosa_read_bat(struct tosa_bat *bat)
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{
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unsigned long value = 0;
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if (bat->gpio_bat < 0 || bat->adc_bat < 0)
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return 0;
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mutex_lock(&bat_lock);
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gpio_set_value(bat->gpio_bat, 1);
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msleep(5);
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value = wm97xx_read_aux_adc(dev_get_drvdata(bat->psy.dev->parent),
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bat->adc_bat);
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gpio_set_value(bat->gpio_bat, 0);
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mutex_unlock(&bat_lock);
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value = value * 1000000 / bat->adc_bat_divider;
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return value;
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}
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static unsigned long tosa_read_temp(struct tosa_bat *bat)
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{
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unsigned long value = 0;
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if (bat->gpio_temp < 0 || bat->adc_temp < 0)
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return 0;
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mutex_lock(&bat_lock);
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gpio_set_value(bat->gpio_temp, 1);
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msleep(5);
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value = wm97xx_read_aux_adc(dev_get_drvdata(bat->psy.dev->parent),
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bat->adc_temp);
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gpio_set_value(bat->gpio_temp, 0);
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mutex_unlock(&bat_lock);
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value = value * 10000 / bat->adc_temp_divider;
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return value;
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}
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static int tosa_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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int ret = 0;
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struct tosa_bat *bat = container_of(psy, struct tosa_bat, psy);
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if (bat->is_present && !bat->is_present(bat)
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&& psp != POWER_SUPPLY_PROP_PRESENT) {
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return -ENODEV;
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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 = bat->technology;
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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val->intval = tosa_read_bat(bat);
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_MAX:
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if (bat->full_chrg == -1)
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val->intval = bat->bat_max;
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else
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val->intval = bat->full_chrg;
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
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val->intval = bat->bat_max;
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
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val->intval = bat->bat_min;
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break;
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case POWER_SUPPLY_PROP_TEMP:
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val->intval = tosa_read_temp(bat);
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break;
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case POWER_SUPPLY_PROP_PRESENT:
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val->intval = bat->is_present ? bat->is_present(bat) : 1;
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break;
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default:
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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static bool tosa_jacket_bat_is_present(struct tosa_bat *bat)
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{
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return gpio_get_value(TOSA_GPIO_JACKET_DETECT) == 0;
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}
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static void tosa_bat_external_power_changed(struct power_supply *psy)
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{
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schedule_work(&bat_work);
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}
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static irqreturn_t tosa_bat_gpio_isr(int irq, void *data)
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{
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pr_info("tosa_bat_gpio irq\n");
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schedule_work(&bat_work);
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return IRQ_HANDLED;
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}
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static void tosa_bat_update(struct tosa_bat *bat)
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{
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int old;
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struct power_supply *psy = &bat->psy;
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mutex_lock(&bat->work_lock);
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old = bat->status;
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if (bat->is_present && !bat->is_present(bat)) {
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printk(KERN_NOTICE "%s not present\n", psy->name);
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bat->status = POWER_SUPPLY_STATUS_UNKNOWN;
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bat->full_chrg = -1;
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} else if (power_supply_am_i_supplied(psy)) {
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if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING) {
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gpio_set_value(bat->gpio_charge_off, 0);
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mdelay(15);
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}
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if (gpio_get_value(bat->gpio_full)) {
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if (old == POWER_SUPPLY_STATUS_CHARGING ||
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bat->full_chrg == -1)
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bat->full_chrg = tosa_read_bat(bat);
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gpio_set_value(bat->gpio_charge_off, 1);
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bat->status = POWER_SUPPLY_STATUS_FULL;
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} else {
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gpio_set_value(bat->gpio_charge_off, 0);
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bat->status = POWER_SUPPLY_STATUS_CHARGING;
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}
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} else {
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gpio_set_value(bat->gpio_charge_off, 1);
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bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
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}
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if (old != bat->status)
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power_supply_changed(psy);
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mutex_unlock(&bat->work_lock);
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}
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static void tosa_bat_work(struct work_struct *work)
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{
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tosa_bat_update(&tosa_bat_main);
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tosa_bat_update(&tosa_bat_jacket);
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}
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static enum power_supply_property tosa_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_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_TEMP,
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POWER_SUPPLY_PROP_PRESENT,
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};
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static enum power_supply_property tosa_bat_bu_props[] = {
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POWER_SUPPLY_PROP_STATUS,
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POWER_SUPPLY_PROP_TECHNOLOGY,
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POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
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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_PRESENT,
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};
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static struct tosa_bat tosa_bat_main = {
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.status = POWER_SUPPLY_STATUS_DISCHARGING,
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.full_chrg = -1,
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.psy = {
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.name = "main-battery",
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.type = POWER_SUPPLY_TYPE_BATTERY,
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.properties = tosa_bat_main_props,
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.num_properties = ARRAY_SIZE(tosa_bat_main_props),
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.get_property = tosa_bat_get_property,
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.external_power_changed = tosa_bat_external_power_changed,
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.use_for_apm = 1,
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},
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.gpio_full = TOSA_GPIO_BAT0_CRG,
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.gpio_charge_off = TOSA_GPIO_CHARGE_OFF,
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.technology = POWER_SUPPLY_TECHNOLOGY_LIPO,
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.gpio_bat = TOSA_GPIO_BAT0_V_ON,
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.adc_bat = WM97XX_AUX_ID3,
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.adc_bat_divider = 414,
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.bat_max = 4310000,
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.bat_min = 1551 * 1000000 / 414,
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.gpio_temp = TOSA_GPIO_BAT1_TH_ON,
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.adc_temp = WM97XX_AUX_ID2,
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.adc_temp_divider = 10000,
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};
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static struct tosa_bat tosa_bat_jacket = {
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.status = POWER_SUPPLY_STATUS_DISCHARGING,
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.full_chrg = -1,
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.psy = {
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.name = "jacket-battery",
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.type = POWER_SUPPLY_TYPE_BATTERY,
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.properties = tosa_bat_main_props,
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.num_properties = ARRAY_SIZE(tosa_bat_main_props),
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.get_property = tosa_bat_get_property,
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.external_power_changed = tosa_bat_external_power_changed,
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},
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.is_present = tosa_jacket_bat_is_present,
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.gpio_full = TOSA_GPIO_BAT1_CRG,
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.gpio_charge_off = TOSA_GPIO_CHARGE_OFF_JC,
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.technology = POWER_SUPPLY_TECHNOLOGY_LIPO,
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.gpio_bat = TOSA_GPIO_BAT1_V_ON,
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.adc_bat = WM97XX_AUX_ID3,
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.adc_bat_divider = 414,
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.bat_max = 4310000,
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.bat_min = 1551 * 1000000 / 414,
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.gpio_temp = TOSA_GPIO_BAT0_TH_ON,
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.adc_temp = WM97XX_AUX_ID2,
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.adc_temp_divider = 10000,
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};
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static struct tosa_bat tosa_bat_bu = {
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.status = POWER_SUPPLY_STATUS_UNKNOWN,
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.full_chrg = -1,
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.psy = {
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.name = "backup-battery",
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.type = POWER_SUPPLY_TYPE_BATTERY,
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.properties = tosa_bat_bu_props,
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.num_properties = ARRAY_SIZE(tosa_bat_bu_props),
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.get_property = tosa_bat_get_property,
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.external_power_changed = tosa_bat_external_power_changed,
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},
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.gpio_full = -1,
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.gpio_charge_off = -1,
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.technology = POWER_SUPPLY_TECHNOLOGY_LiMn,
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.gpio_bat = TOSA_GPIO_BU_CHRG_ON,
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.adc_bat = WM97XX_AUX_ID4,
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.adc_bat_divider = 1266,
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.gpio_temp = -1,
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.adc_temp = -1,
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.adc_temp_divider = -1,
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};
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static struct gpio tosa_bat_gpios[] = {
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{ TOSA_GPIO_CHARGE_OFF, GPIOF_OUT_INIT_HIGH, "main charge off" },
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{ TOSA_GPIO_CHARGE_OFF_JC, GPIOF_OUT_INIT_HIGH, "jacket charge off" },
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{ TOSA_GPIO_BAT_SW_ON, GPIOF_OUT_INIT_LOW, "battery switch" },
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{ TOSA_GPIO_BAT0_V_ON, GPIOF_OUT_INIT_LOW, "main battery" },
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{ TOSA_GPIO_BAT1_V_ON, GPIOF_OUT_INIT_LOW, "jacket battery" },
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{ TOSA_GPIO_BAT1_TH_ON, GPIOF_OUT_INIT_LOW, "main battery temp" },
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{ TOSA_GPIO_BAT0_TH_ON, GPIOF_OUT_INIT_LOW, "jacket battery temp" },
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{ TOSA_GPIO_BU_CHRG_ON, GPIOF_OUT_INIT_LOW, "backup battery" },
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{ TOSA_GPIO_BAT0_CRG, GPIOF_IN, "main battery full" },
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{ TOSA_GPIO_BAT1_CRG, GPIOF_IN, "jacket battery full" },
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{ TOSA_GPIO_BAT0_LOW, GPIOF_IN, "main battery low" },
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{ TOSA_GPIO_BAT1_LOW, GPIOF_IN, "jacket battery low" },
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{ TOSA_GPIO_JACKET_DETECT, GPIOF_IN, "jacket detect" },
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};
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#ifdef CONFIG_PM
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static int tosa_bat_suspend(struct platform_device *dev, pm_message_t state)
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{
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/* flush all pending status updates */
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flush_work(&bat_work);
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return 0;
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}
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static int tosa_bat_resume(struct platform_device *dev)
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{
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/* things may have changed while we were away */
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schedule_work(&bat_work);
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return 0;
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}
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#else
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#define tosa_bat_suspend NULL
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#define tosa_bat_resume NULL
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#endif
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static int tosa_bat_probe(struct platform_device *dev)
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{
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int ret;
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if (!machine_is_tosa())
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return -ENODEV;
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ret = gpio_request_array(tosa_bat_gpios, ARRAY_SIZE(tosa_bat_gpios));
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if (ret)
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return ret;
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mutex_init(&tosa_bat_main.work_lock);
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mutex_init(&tosa_bat_jacket.work_lock);
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INIT_WORK(&bat_work, tosa_bat_work);
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ret = power_supply_register(&dev->dev, &tosa_bat_main.psy);
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if (ret)
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goto err_psy_reg_main;
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ret = power_supply_register(&dev->dev, &tosa_bat_jacket.psy);
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if (ret)
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goto err_psy_reg_jacket;
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ret = power_supply_register(&dev->dev, &tosa_bat_bu.psy);
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if (ret)
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goto err_psy_reg_bu;
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ret = request_irq(gpio_to_irq(TOSA_GPIO_BAT0_CRG),
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tosa_bat_gpio_isr,
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IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
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"main full", &tosa_bat_main);
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if (ret)
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goto err_req_main;
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ret = request_irq(gpio_to_irq(TOSA_GPIO_BAT1_CRG),
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tosa_bat_gpio_isr,
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IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
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"jacket full", &tosa_bat_jacket);
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if (ret)
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goto err_req_jacket;
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ret = request_irq(gpio_to_irq(TOSA_GPIO_JACKET_DETECT),
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tosa_bat_gpio_isr,
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IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
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"jacket detect", &tosa_bat_jacket);
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if (!ret) {
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schedule_work(&bat_work);
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return 0;
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}
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free_irq(gpio_to_irq(TOSA_GPIO_BAT1_CRG), &tosa_bat_jacket);
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err_req_jacket:
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free_irq(gpio_to_irq(TOSA_GPIO_BAT0_CRG), &tosa_bat_main);
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err_req_main:
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power_supply_unregister(&tosa_bat_bu.psy);
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err_psy_reg_bu:
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power_supply_unregister(&tosa_bat_jacket.psy);
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err_psy_reg_jacket:
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power_supply_unregister(&tosa_bat_main.psy);
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err_psy_reg_main:
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/* see comment in tosa_bat_remove */
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cancel_work_sync(&bat_work);
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gpio_free_array(tosa_bat_gpios, ARRAY_SIZE(tosa_bat_gpios));
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return ret;
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}
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static int tosa_bat_remove(struct platform_device *dev)
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{
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free_irq(gpio_to_irq(TOSA_GPIO_JACKET_DETECT), &tosa_bat_jacket);
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free_irq(gpio_to_irq(TOSA_GPIO_BAT1_CRG), &tosa_bat_jacket);
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free_irq(gpio_to_irq(TOSA_GPIO_BAT0_CRG), &tosa_bat_main);
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power_supply_unregister(&tosa_bat_bu.psy);
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power_supply_unregister(&tosa_bat_jacket.psy);
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power_supply_unregister(&tosa_bat_main.psy);
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/*
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* Now cancel the bat_work. We won't get any more schedules,
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* since all sources (isr and external_power_changed) are
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* unregistered now.
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*/
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cancel_work_sync(&bat_work);
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gpio_free_array(tosa_bat_gpios, ARRAY_SIZE(tosa_bat_gpios));
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return 0;
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}
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static struct platform_driver tosa_bat_driver = {
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.driver.name = "wm97xx-battery",
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.driver.owner = THIS_MODULE,
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.probe = tosa_bat_probe,
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.remove = tosa_bat_remove,
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.suspend = tosa_bat_suspend,
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.resume = tosa_bat_resume,
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};
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module_platform_driver(tosa_bat_driver);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Dmitry Baryshkov");
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MODULE_DESCRIPTION("Tosa battery driver");
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MODULE_ALIAS("platform:wm97xx-battery");
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