--- /dev/null
+/*
+ * Battery and Power Management code for the Sharp SL-5x00
+ *
+ * Copyright (C) 2009 Thomas Kunze
+ *
+ * based on tosa_battery.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/power_supply.h>
+#include <linux/delay.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <linux/gpio.h>
+#include <linux/mfd/ucb1x00.h>
+
+#include <asm/mach/sharpsl_param.h>
+#include <asm/mach-types.h>
+#include <mach/collie.h>
+
+static DEFINE_MUTEX(bat_lock); /* protects gpio pins */
+static struct work_struct bat_work;
+static struct ucb1x00 *ucb;
+static int wakeup_enabled;
+
+struct collie_bat {
+ int status;
+ struct power_supply *psy;
+ int full_chrg;
+
+ struct mutex work_lock; /* protects data */
+
+ bool (*is_present)(struct collie_bat *bat);
+ int gpio_full;
+ int gpio_charge_on;
+
+ int technology;
+
+ int gpio_bat;
+ int adc_bat;
+ int adc_bat_divider;
+ int bat_max;
+ int bat_min;
+
+ int gpio_temp;
+ int adc_temp;
+ int adc_temp_divider;
+};
+
+static struct collie_bat collie_bat_main;
+
+static unsigned long collie_read_bat(struct collie_bat *bat)
+{
+ unsigned long value = 0;
+
+ if (bat->gpio_bat < 0 || bat->adc_bat < 0)
+ return 0;
+ mutex_lock(&bat_lock);
+ gpio_set_value(bat->gpio_bat, 1);
+ msleep(5);
+ ucb1x00_adc_enable(ucb);
+ value = ucb1x00_adc_read(ucb, bat->adc_bat, UCB_SYNC);
+ ucb1x00_adc_disable(ucb);
+ gpio_set_value(bat->gpio_bat, 0);
+ mutex_unlock(&bat_lock);
+ value = value * 1000000 / bat->adc_bat_divider;
+
+ return value;
+}
+
+static unsigned long collie_read_temp(struct collie_bat *bat)
+{
+ unsigned long value = 0;
+ if (bat->gpio_temp < 0 || bat->adc_temp < 0)
+ return 0;
+
+ mutex_lock(&bat_lock);
+ gpio_set_value(bat->gpio_temp, 1);
+ msleep(5);
+ ucb1x00_adc_enable(ucb);
+ value = ucb1x00_adc_read(ucb, bat->adc_temp, UCB_SYNC);
+ ucb1x00_adc_disable(ucb);
+ gpio_set_value(bat->gpio_temp, 0);
+ mutex_unlock(&bat_lock);
+
+ value = value * 10000 / bat->adc_temp_divider;
+
+ return value;
+}
+
+static int collie_bat_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ int ret = 0;
+ struct collie_bat *bat = power_supply_get_drvdata(psy);
+
+ if (bat->is_present && !bat->is_present(bat)
+ && psp != POWER_SUPPLY_PROP_PRESENT) {
+ return -ENODEV;
+ }
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_STATUS:
+ val->intval = bat->status;
+ break;
+ case POWER_SUPPLY_PROP_TECHNOLOGY:
+ val->intval = bat->technology;
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ val->intval = collie_read_bat(bat);
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_MAX:
+ if (bat->full_chrg == -1)
+ val->intval = bat->bat_max;
+ else
+ val->intval = bat->full_chrg;
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
+ val->intval = bat->bat_max;
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
+ val->intval = bat->bat_min;
+ break;
+ case POWER_SUPPLY_PROP_TEMP:
+ val->intval = collie_read_temp(bat);
+ break;
+ case POWER_SUPPLY_PROP_PRESENT:
+ val->intval = bat->is_present ? bat->is_present(bat) : 1;
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+ return ret;
+}
+
+static void collie_bat_external_power_changed(struct power_supply *psy)
+{
+ schedule_work(&bat_work);
+}
+
+static irqreturn_t collie_bat_gpio_isr(int irq, void *data)
+{
+ pr_info("collie_bat_gpio irq\n");
+ schedule_work(&bat_work);
+ return IRQ_HANDLED;
+}
+
+static void collie_bat_update(struct collie_bat *bat)
+{
+ int old;
+ struct power_supply *psy = bat->psy;
+
+ mutex_lock(&bat->work_lock);
+
+ old = bat->status;
+
+ if (bat->is_present && !bat->is_present(bat)) {
+ printk(KERN_NOTICE "%s not present\n", psy->desc->name);
+ bat->status = POWER_SUPPLY_STATUS_UNKNOWN;
+ bat->full_chrg = -1;
+ } else if (power_supply_am_i_supplied(psy)) {
+ if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING) {
+ gpio_set_value(bat->gpio_charge_on, 1);
+ mdelay(15);
+ }
+
+ if (gpio_get_value(bat->gpio_full)) {
+ if (old == POWER_SUPPLY_STATUS_CHARGING ||
+ bat->full_chrg == -1)
+ bat->full_chrg = collie_read_bat(bat);
+
+ gpio_set_value(bat->gpio_charge_on, 0);
+ bat->status = POWER_SUPPLY_STATUS_FULL;
+ } else {
+ gpio_set_value(bat->gpio_charge_on, 1);
+ bat->status = POWER_SUPPLY_STATUS_CHARGING;
+ }
+ } else {
+ gpio_set_value(bat->gpio_charge_on, 0);
+ bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
+ }
+
+ if (old != bat->status)
+ power_supply_changed(psy);
+
+ mutex_unlock(&bat->work_lock);
+}
+
+static void collie_bat_work(struct work_struct *work)
+{
+ collie_bat_update(&collie_bat_main);
+}
+
+
+static enum power_supply_property collie_bat_main_props[] = {
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_TECHNOLOGY,
+ POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
+ POWER_SUPPLY_PROP_VOLTAGE_MAX,
+ POWER_SUPPLY_PROP_PRESENT,
+ POWER_SUPPLY_PROP_TEMP,
+};
+
+static enum power_supply_property collie_bat_bu_props[] = {
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_TECHNOLOGY,
+ POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
+ POWER_SUPPLY_PROP_VOLTAGE_MAX,
+ POWER_SUPPLY_PROP_PRESENT,
+};
+
+static const struct power_supply_desc collie_bat_main_desc = {
+ .name = "main-battery",
+ .type = POWER_SUPPLY_TYPE_BATTERY,
+ .properties = collie_bat_main_props,
+ .num_properties = ARRAY_SIZE(collie_bat_main_props),
+ .get_property = collie_bat_get_property,
+ .external_power_changed = collie_bat_external_power_changed,
+ .use_for_apm = 1,
+};
+
+static struct collie_bat collie_bat_main = {
+ .status = POWER_SUPPLY_STATUS_DISCHARGING,
+ .full_chrg = -1,
+ .psy = NULL,
+
+ .gpio_full = COLLIE_GPIO_CO,
+ .gpio_charge_on = COLLIE_GPIO_CHARGE_ON,
+
+ .technology = POWER_SUPPLY_TECHNOLOGY_LIPO,
+
+ .gpio_bat = COLLIE_GPIO_MBAT_ON,
+ .adc_bat = UCB_ADC_INP_AD1,
+ .adc_bat_divider = 155,
+ .bat_max = 4310000,
+ .bat_min = 1551 * 1000000 / 414,
+
+ .gpio_temp = COLLIE_GPIO_TMP_ON,
+ .adc_temp = UCB_ADC_INP_AD0,
+ .adc_temp_divider = 10000,
+};
+
+static const struct power_supply_desc collie_bat_bu_desc = {
+ .name = "backup-battery",
+ .type = POWER_SUPPLY_TYPE_BATTERY,
+ .properties = collie_bat_bu_props,
+ .num_properties = ARRAY_SIZE(collie_bat_bu_props),
+ .get_property = collie_bat_get_property,
+ .external_power_changed = collie_bat_external_power_changed,
+};
+
+static struct collie_bat collie_bat_bu = {
+ .status = POWER_SUPPLY_STATUS_UNKNOWN,
+ .full_chrg = -1,
+ .psy = NULL,
+
+ .gpio_full = -1,
+ .gpio_charge_on = -1,
+
+ .technology = POWER_SUPPLY_TECHNOLOGY_LiMn,
+
+ .gpio_bat = COLLIE_GPIO_BBAT_ON,
+ .adc_bat = UCB_ADC_INP_AD1,
+ .adc_bat_divider = 155,
+ .bat_max = 3000000,
+ .bat_min = 1900000,
+
+ .gpio_temp = -1,
+ .adc_temp = -1,
+ .adc_temp_divider = -1,
+};
+
+static struct gpio collie_batt_gpios[] = {
+ { COLLIE_GPIO_CO, GPIOF_IN, "main battery full" },
+ { COLLIE_GPIO_MAIN_BAT_LOW, GPIOF_IN, "main battery low" },
+ { COLLIE_GPIO_CHARGE_ON, GPIOF_OUT_INIT_LOW, "main charge on" },
+ { COLLIE_GPIO_MBAT_ON, GPIOF_OUT_INIT_LOW, "main battery" },
+ { COLLIE_GPIO_TMP_ON, GPIOF_OUT_INIT_LOW, "main battery temp" },
+ { COLLIE_GPIO_BBAT_ON, GPIOF_OUT_INIT_LOW, "backup battery" },
+};
+
+#ifdef CONFIG_PM
+static int collie_bat_suspend(struct ucb1x00_dev *dev)
+{
+ /* flush all pending status updates */
+ flush_work(&bat_work);
+
+ if (device_may_wakeup(&dev->ucb->dev) &&
+ collie_bat_main.status == POWER_SUPPLY_STATUS_CHARGING)
+ wakeup_enabled = !enable_irq_wake(gpio_to_irq(COLLIE_GPIO_CO));
+ else
+ wakeup_enabled = 0;
+
+ return 0;
+}
+
+static int collie_bat_resume(struct ucb1x00_dev *dev)
+{
+ if (wakeup_enabled)
+ disable_irq_wake(gpio_to_irq(COLLIE_GPIO_CO));
+
+ /* things may have changed while we were away */
+ schedule_work(&bat_work);
+ return 0;
+}
+#else
+#define collie_bat_suspend NULL
+#define collie_bat_resume NULL
+#endif
+
+static int collie_bat_probe(struct ucb1x00_dev *dev)
+{
+ int ret;
+ struct power_supply_config psy_main_cfg = {}, psy_bu_cfg = {};
+
+ if (!machine_is_collie())
+ return -ENODEV;
+
+ ucb = dev->ucb;
+
+ ret = gpio_request_array(collie_batt_gpios,
+ ARRAY_SIZE(collie_batt_gpios));
+ if (ret)
+ return ret;
+
+ mutex_init(&collie_bat_main.work_lock);
+
+ INIT_WORK(&bat_work, collie_bat_work);
+
+ psy_main_cfg.drv_data = &collie_bat_main;
+ collie_bat_main.psy = power_supply_register(&dev->ucb->dev,
+ &collie_bat_main_desc,
+ &psy_main_cfg);
+ if (IS_ERR(collie_bat_main.psy)) {
+ ret = PTR_ERR(collie_bat_main.psy);
+ goto err_psy_reg_main;
+ }
+
+ psy_bu_cfg.drv_data = &collie_bat_bu;
+ collie_bat_bu.psy = power_supply_register(&dev->ucb->dev,
+ &collie_bat_bu_desc,
+ &psy_bu_cfg);
+ if (IS_ERR(collie_bat_bu.psy)) {
+ ret = PTR_ERR(collie_bat_bu.psy);
+ goto err_psy_reg_bu;
+ }
+
+ ret = request_irq(gpio_to_irq(COLLIE_GPIO_CO),
+ collie_bat_gpio_isr,
+ IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
+ "main full", &collie_bat_main);
+ if (ret)
+ goto err_irq;
+
+ device_init_wakeup(&ucb->dev, 1);
+ schedule_work(&bat_work);
+
+ return 0;
+
+err_irq:
+ power_supply_unregister(collie_bat_bu.psy);
+err_psy_reg_bu:
+ power_supply_unregister(collie_bat_main.psy);
+err_psy_reg_main:
+
+ /* see comment in collie_bat_remove */
+ cancel_work_sync(&bat_work);
+ gpio_free_array(collie_batt_gpios, ARRAY_SIZE(collie_batt_gpios));
+ return ret;
+}
+
+static void collie_bat_remove(struct ucb1x00_dev *dev)
+{
+ free_irq(gpio_to_irq(COLLIE_GPIO_CO), &collie_bat_main);
+
+ power_supply_unregister(collie_bat_bu.psy);
+ power_supply_unregister(collie_bat_main.psy);
+
+ /*
+ * Now cancel the bat_work. We won't get any more schedules,
+ * since all sources (isr and external_power_changed) are
+ * unregistered now.
+ */
+ cancel_work_sync(&bat_work);
+ gpio_free_array(collie_batt_gpios, ARRAY_SIZE(collie_batt_gpios));
+}
+
+static struct ucb1x00_driver collie_bat_driver = {
+ .add = collie_bat_probe,
+ .remove = collie_bat_remove,
+ .suspend = collie_bat_suspend,
+ .resume = collie_bat_resume,
+};
+
+static int __init collie_bat_init(void)
+{
+ return ucb1x00_register_driver(&collie_bat_driver);
+}
+
+static void __exit collie_bat_exit(void)
+{
+ ucb1x00_unregister_driver(&collie_bat_driver);
+}
+
+module_init(collie_bat_init);
+module_exit(collie_bat_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Thomas Kunze");
+MODULE_DESCRIPTION("Collie battery driver");
Code Review / kvmfornfv.git / blobdiff