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@@ -0,0 +1,418 @@
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+/*
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+ * Battery and Power Management code for the Sharp SL-5x00
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+ *
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+ * Copyright (C) 2009 Thomas Kunze
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+ *
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+ * based on tosa_battery.c
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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/gpio.h>
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+#include <linux/mfd/ucb1x00.h>
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+
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+#include <asm/mach/sharpsl_param.h>
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+#include <asm/mach-types.h>
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+#include <mach/collie.h>
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+
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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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+static struct ucb1x00 *ucb;
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+
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+struct collie_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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+
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+ struct mutex work_lock; /* protects data */
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+
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+ bool (*is_present)(struct collie_bat *bat);
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+ int gpio_full;
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+ int gpio_charge_on;
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+
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+ int technology;
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+
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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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+
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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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+
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+static struct collie_bat collie_bat_main;
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+
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+static unsigned long collie_read_bat(struct collie_bat *bat)
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+{
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+ unsigned long value = 0;
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+
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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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+ ucb1x00_adc_enable(ucb);
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+ value = ucb1x00_adc_read(ucb, bat->adc_bat, UCB_SYNC);
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+ ucb1x00_adc_disable(ucb);
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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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+
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+ return value;
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+}
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+
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+static unsigned long collie_read_temp(struct collie_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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+
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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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+ ucb1x00_adc_enable(ucb);
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+ value = ucb1x00_adc_read(ucb, bat->adc_temp, UCB_SYNC);
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+ ucb1x00_adc_disable(ucb);
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+ gpio_set_value(bat->gpio_temp, 0);
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+ mutex_unlock(&bat_lock);
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+
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+ value = value * 10000 / bat->adc_temp_divider;
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+
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+ return value;
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+}
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+
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+static int collie_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 collie_bat *bat = container_of(psy, struct collie_bat, psy);
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+
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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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+
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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 = collie_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 = collie_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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+
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+static void collie_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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+
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+static irqreturn_t collie_bat_gpio_isr(int irq, void *data)
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+{
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+ pr_info("collie_bat_gpio irq: %d\n", gpio_get_value(irq_to_gpio(irq)));
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+ schedule_work(&bat_work);
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+ return IRQ_HANDLED;
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+}
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+
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+static void collie_bat_update(struct collie_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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+
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+ mutex_lock(&bat->work_lock);
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+
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+ old = bat->status;
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+
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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_on, 1);
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+ mdelay(15);
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+ }
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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 = collie_read_bat(bat);
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+
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+ gpio_set_value(bat->gpio_charge_on, 0);
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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_on, 1);
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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_on, 0);
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+ bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
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+ }
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+
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+ if (old != bat->status)
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+ power_supply_changed(psy);
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+
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+ mutex_unlock(&bat->work_lock);
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+}
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+
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+static void collie_bat_work(struct work_struct *work)
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+{
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+ collie_bat_update(&collie_bat_main);
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+}
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+
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+
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+static enum power_supply_property collie_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_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_VOLTAGE_MAX,
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+ POWER_SUPPLY_PROP_PRESENT,
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+ POWER_SUPPLY_PROP_TEMP,
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+};
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+
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+static enum power_supply_property collie_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_VOLTAGE_MAX,
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+ POWER_SUPPLY_PROP_PRESENT,
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+};
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+
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+static struct collie_bat collie_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 = collie_bat_main_props,
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+ .num_properties = ARRAY_SIZE(collie_bat_main_props),
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+ .get_property = collie_bat_get_property,
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+ .external_power_changed = collie_bat_external_power_changed,
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+ .use_for_apm = 1,
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+ },
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+
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+ .gpio_full = COLLIE_GPIO_CO,
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+ .gpio_charge_on = COLLIE_GPIO_CHARGE_ON,
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+
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+ .technology = POWER_SUPPLY_TECHNOLOGY_LIPO,
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+
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+ .gpio_bat = COLLIE_GPIO_MBAT_ON,
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+ .adc_bat = UCB_ADC_INP_AD1,
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+ .adc_bat_divider = 155,
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+ .bat_max = 4310000,
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+ .bat_min = 1551 * 1000000 / 414,
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+
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+ .gpio_temp = COLLIE_GPIO_TMP_ON,
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+ .adc_temp = UCB_ADC_INP_AD0,
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+ .adc_temp_divider = 10000,
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+};
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+
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+static struct collie_bat collie_bat_bu = {
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+ .status = POWER_SUPPLY_STATUS_UNKNOWN,
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+ .full_chrg = -1,
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+
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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 = collie_bat_bu_props,
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+ .num_properties = ARRAY_SIZE(collie_bat_bu_props),
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+ .get_property = collie_bat_get_property,
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+ .external_power_changed = collie_bat_external_power_changed,
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+ },
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+
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+ .gpio_full = -1,
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+ .gpio_charge_on = -1,
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+
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+ .technology = POWER_SUPPLY_TECHNOLOGY_LiMn,
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+
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+ .gpio_bat = COLLIE_GPIO_BBAT_ON,
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+ .adc_bat = UCB_ADC_INP_AD1,
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+ .adc_bat_divider = 155,
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+ .bat_max = 3000000,
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+ .bat_min = 1900000,
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+
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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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+
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+static struct {
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+ int gpio;
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+ char *name;
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+ bool output;
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+ int value;
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+} gpios[] = {
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+ { COLLIE_GPIO_CO, "main battery full", 0, 0 },
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+ { COLLIE_GPIO_MAIN_BAT_LOW, "main battery low", 0, 0 },
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+ { COLLIE_GPIO_CHARGE_ON, "main charge on", 1, 0 },
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+ { COLLIE_GPIO_MBAT_ON, "main battery", 1, 0 },
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+ { COLLIE_GPIO_TMP_ON, "main battery temp", 1, 0 },
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+ { COLLIE_GPIO_BBAT_ON, "backup battery", 1, 0 },
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+};
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+
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+#ifdef CONFIG_PM
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+static int collie_bat_suspend(struct ucb1x00_dev *dev, pm_message_t state)
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+{
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+ /* flush all pending status updates */
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+ flush_scheduled_work();
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+ return 0;
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+}
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+
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+static int collie_bat_resume(struct ucb1x00_dev *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 collie_bat_suspend NULL
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+#define collie_bat_resume NULL
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+#endif
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+
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+static int __devinit collie_bat_probe(struct ucb1x00_dev *dev)
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+{
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+ int ret;
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+ int i;
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+
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+ if (!machine_is_collie())
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+ return -ENODEV;
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+
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+ ucb = dev->ucb;
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+
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+ for (i = 0; i < ARRAY_SIZE(gpios); i++) {
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+ ret = gpio_request(gpios[i].gpio, gpios[i].name);
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+ if (ret) {
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+ i--;
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+ goto err_gpio;
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+ }
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+
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+ if (gpios[i].output)
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+ ret = gpio_direction_output(gpios[i].gpio,
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+ gpios[i].value);
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+ else
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+ ret = gpio_direction_input(gpios[i].gpio);
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+
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+ if (ret)
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+ goto err_gpio;
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+ }
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+
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+ mutex_init(&collie_bat_main.work_lock);
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+
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+ INIT_WORK(&bat_work, collie_bat_work);
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+
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+ ret = power_supply_register(&dev->ucb->dev, &collie_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->ucb->dev, &collie_bat_bu.psy);
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+ if (ret)
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+ goto err_psy_reg_bu;
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+
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+ ret = request_irq(gpio_to_irq(COLLIE_GPIO_CO),
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+ collie_bat_gpio_isr,
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+ IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
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+ "main full", &collie_bat_main);
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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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+ power_supply_unregister(&collie_bat_bu.psy);
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+err_psy_reg_bu:
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+ power_supply_unregister(&collie_bat_main.psy);
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+err_psy_reg_main:
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+
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+ /* see comment in collie_bat_remove */
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+ flush_scheduled_work();
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+
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+ i--;
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+err_gpio:
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+ for (; i >= 0; i--)
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+ gpio_free(gpios[i].gpio);
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+
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+ return ret;
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+}
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+
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+static void __devexit collie_bat_remove(struct ucb1x00_dev *dev)
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+{
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+ int i;
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+
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+ free_irq(gpio_to_irq(COLLIE_GPIO_CO), &collie_bat_main);
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+
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+ power_supply_unregister(&collie_bat_bu.psy);
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+ power_supply_unregister(&collie_bat_main.psy);
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+
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+ /*
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+ * now flush all pending work.
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+ * we won't get any more schedules, since all
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+ * sources (isr and external_power_changed)
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+ * are unregistered now.
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+ */
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+ flush_scheduled_work();
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+
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+ for (i = ARRAY_SIZE(gpios) - 1; i >= 0; i--)
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+ gpio_free(gpios[i].gpio);
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+}
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+
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+static struct ucb1x00_driver collie_bat_driver = {
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+ .add = collie_bat_probe,
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+ .remove = __devexit_p(collie_bat_remove),
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+ .suspend = collie_bat_suspend,
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+ .resume = collie_bat_resume,
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+};
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+
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+static int __init collie_bat_init(void)
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+{
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+ return ucb1x00_register_driver(&collie_bat_driver);
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+}
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+
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+static void __exit collie_bat_exit(void)
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+{
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+ ucb1x00_unregister_driver(&collie_bat_driver);
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+}
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+
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+module_init(collie_bat_init);
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+module_exit(collie_bat_exit);
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+
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+MODULE_LICENSE("GPL");
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+MODULE_AUTHOR("Thomas Kunze");
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+MODULE_DESCRIPTION("Collie battery driver");
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Russell King