text: /*
   * 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.
   *
   * h3xxx atmel micro companion support, battery subdevice
   * based on previous kernel 2.4 version
   * Author : Alessandro Gardich <gremlin@gremlin.it>
   * Author : Linus Walleij <linus.walleij@linaro.org>
   *
   */
  
  #include <linux/module.h>
  #include <linux/init.h>
  #include <linux/platform_device.h>
  #include <linux/mfd/ipaq-micro.h>
  #include <linux/power_supply.h>
  #include <linux/workqueue.h>
  
  #define BATT_PERIOD 100000 /* 100 seconds in milliseconds */
  
  #define MICRO_BATT_CHEM_ALKALINE	0x01
  #define MICRO_BATT_CHEM_NICD		0x02
  #define MICRO_BATT_CHEM_NIMH		0x03
  #define MICRO_BATT_CHEM_LION		0x04
  #define MICRO_BATT_CHEM_LIPOLY		0x05
  #define MICRO_BATT_CHEM_NOT_INSTALLED	0x06
  #define MICRO_BATT_CHEM_UNKNOWN		0xff
  
  #define MICRO_BATT_STATUS_HIGH		0x01
  #define MICRO_BATT_STATUS_LOW		0x02
  #define MICRO_BATT_STATUS_CRITICAL	0x04
  #define MICRO_BATT_STATUS_CHARGING	0x08
  #define MICRO_BATT_STATUS_CHARGEMAIN	0x10
  #define MICRO_BATT_STATUS_DEAD		0x20 /* Battery will not charge */
  #define MICRO_BATT_STATUS_NOTINSTALLED	0x20 /* For expansion pack batteries */
  #define MICRO_BATT_STATUS_FULL		0x40 /* Battery fully charged */
  #define MICRO_BATT_STATUS_NOBATTERY	0x80
  #define MICRO_BATT_STATUS_UNKNOWN	0xff
  
  struct micro_battery {
  	struct ipaq_micro *micro;
  	struct workqueue_struct *wq;
  	struct delayed_work update;
  	u8 ac;
  	u8 chemistry;
  	unsigned int voltage;
  	u16 temperature;
  	u8 flag;
  };
  
  static void micro_battery_work(struct work_struct *work)
  {
  	struct micro_battery *mb = container_of(work,
  				struct micro_battery, update.work);
  	struct ipaq_micro_msg msg_battery = {
  		.id = MSG_BATTERY,
  	};
  	struct ipaq_micro_msg msg_sensor = {
  		.id = MSG_THERMAL_SENSOR,
  	};
  
  	/* First send battery message */
  	ipaq_micro_tx_msg_sync(mb->micro, &msg_battery);
  	if (msg_battery.rx_len < 4)
  		pr_info("ERROR");
  
  	/*
  	 * Returned message format:
  	 * byte 0:   0x00 = Not plugged in
  	 *           0x01 = AC adapter plugged in
  	 * byte 1:   chemistry
  	 * byte 2:   voltage LSB
  	 * byte 3:   voltage MSB
  	 * byte 4:   flags
  	 * byte 5-9: same for battery 2
  	 */
  	mb->ac = msg_battery.rx_data[0];
  	mb->chemistry = msg_battery.rx_data[1];
  	mb->voltage = ((((unsigned short)msg_battery.rx_data[3] << 8) +
  			msg_battery.rx_data[2]) * 5000L) * 1000 / 1024;
  	mb->flag = msg_battery.rx_data[4];
  
  	if (msg_battery.rx_len == 9)
  		pr_debug("second battery ignored\n");
  
  	/* Then read the sensor */
  	ipaq_micro_tx_msg_sync(mb->micro, &msg_sensor);
  	mb->temperature = msg_sensor.rx_data[1] << 8 | msg_sensor.rx_data[0];
  
  	queue_delayed_work(mb->wq, &mb->update, msecs_to_jiffies(BATT_PERIOD));
  }
  
  static int get_capacity(struct power_supply *b)
  {
  	struct micro_battery *mb = dev_get_drvdata(b->dev.parent);
  
  	switch (mb->flag & 0x07) {
  	case MICRO_BATT_STATUS_HIGH:
  		return 100;
  		break;
  	case MICRO_BATT_STATUS_LOW:
  		return 50;
  		break;
  	case MICRO_BATT_STATUS_CRITICAL:
  		return 5;
  		break;
  	default:
  		break;
  	}
  	return 0;
  }
  
  static int get_status(struct power_supply *b)
  {
  	struct micro_battery *mb = dev_get_drvdata(b->dev.parent);
  
  	if (mb->flag == MICRO_BATT_STATUS_UNKNOWN)
  		return POWER_SUPPLY_STATUS_UNKNOWN;
  
  	if (mb->flag & MICRO_BATT_STATUS_FULL)
  		return POWER_SUPPLY_STATUS_FULL;
  
  	if ((mb->flag & MICRO_BATT_STATUS_CHARGING) ||
  		(mb->flag & MICRO_BATT_STATUS_CHARGEMAIN))
  		return POWER_SUPPLY_STATUS_CHARGING;
  
  	return POWER_SUPPLY_STATUS_DISCHARGING;
  }
  
  static int micro_batt_get_property(struct power_supply *b,
  					enum power_supply_property psp,
  					union power_supply_propval *val)
  {
  	struct micro_battery *mb = dev_get_drvdata(b->dev.parent);
  
  	switch (psp) {
  	case POWER_SUPPLY_PROP_TECHNOLOGY:
  		switch (mb->chemistry) {
  		case MICRO_BATT_CHEM_NICD:
  			val->intval = POWER_SUPPLY_TECHNOLOGY_NiCd;
  			break;
  		case MICRO_BATT_CHEM_NIMH:
  			val->intval = POWER_SUPPLY_TECHNOLOGY_NiMH;
  			break;
  		case MICRO_BATT_CHEM_LION:
  			val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
  			break;
  		case MICRO_BATT_CHEM_LIPOLY:
  			val->intval = POWER_SUPPLY_TECHNOLOGY_LIPO;
  			break;
  		default:
  			val->intval = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
  			break;
  		};
  		break;
  	case POWER_SUPPLY_PROP_STATUS:
  		val->intval = get_status(b);
  		break;
  	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
  		val->intval = 4700000;
  		break;
  	case POWER_SUPPLY_PROP_CAPACITY:
  		val->intval = get_capacity(b);
  		break;
  	case POWER_SUPPLY_PROP_TEMP:
  		val->intval = mb->temperature;
  		break;
  	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
  		val->intval = mb->voltage;
  		break;
  	default:
  		return -EINVAL;
  	};
  
  	return 0;
  }
  
  static int micro_ac_get_property(struct power_supply *b,
  				 enum power_supply_property psp,
  				 union power_supply_propval *val)
  {
  	struct micro_battery *mb = dev_get_drvdata(b->dev.parent);
  
  	switch (psp) {
  	case POWER_SUPPLY_PROP_ONLINE:
  		val->intval = mb->ac;
  		break;
  	default:
  		return -EINVAL;
  	};
  
  	return 0;
  }
  
  static enum power_supply_property micro_batt_power_props[] = {
  	POWER_SUPPLY_PROP_TECHNOLOGY,
  	POWER_SUPPLY_PROP_STATUS,
  	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
  	POWER_SUPPLY_PROP_CAPACITY,
  	POWER_SUPPLY_PROP_TEMP,
  	POWER_SUPPLY_PROP_VOLTAGE_NOW,
  };
  
  static const struct power_supply_desc micro_batt_power_desc = {
  	.name			= "main-battery",
  	.type			= POWER_SUPPLY_TYPE_BATTERY,
  	.properties		= micro_batt_power_props,
  	.num_properties		= ARRAY_SIZE(micro_batt_power_props),
  	.get_property		= micro_batt_get_property,
  	.use_for_apm		= 1,
  };
  
  static enum power_supply_property micro_ac_power_props[] = {
  	POWER_SUPPLY_PROP_ONLINE,
  };
  
  static const struct power_supply_desc micro_ac_power_desc = {
  	.name			= "ac",
  	.type			= POWER_SUPPLY_TYPE_MAINS,
  	.properties		= micro_ac_power_props,
  	.num_properties		= ARRAY_SIZE(micro_ac_power_props),
  	.get_property		= micro_ac_get_property,
  };
  
  static struct power_supply *micro_batt_power, *micro_ac_power;
  
  static int micro_batt_probe(struct platform_device *pdev)
  {
  	struct micro_battery *mb;
  	int ret;
  
  	mb = devm_kzalloc(&pdev->dev, sizeof(*mb), GFP_KERNEL);
  	if (!mb)
  		return -ENOMEM;
  
  	mb->micro = dev_get_drvdata(pdev->dev.parent);
  	mb->wq = create_singlethread_workqueue("ipaq-battery-wq");
  	if (!mb->wq)
  		return -ENOMEM;
  
  	INIT_DELAYED_WORK(&mb->update, micro_battery_work);
  	platform_set_drvdata(pdev, mb);
  	queue_delayed_work(mb->wq, &mb->update, 1);
  
  	micro_batt_power = power_supply_register(&pdev->dev,
  						 &micro_batt_power_desc, NULL);
  	if (IS_ERR(micro_batt_power)) {
  		ret = PTR_ERR(micro_batt_power);
  		goto batt_err;
  	}
  
  	micro_ac_power = power_supply_register(&pdev->dev,
  					       &micro_ac_power_desc, NULL);
  	if (IS_ERR(micro_ac_power)) {
  		ret = PTR_ERR(micro_ac_power);
  		goto ac_err;
  	}
  
  	dev_info(&pdev->dev, "iPAQ micro battery driver\n");
  	return 0;
  
  ac_err:
  	power_supply_unregister(micro_batt_power);
  batt_err:
  	cancel_delayed_work_sync(&mb->update);
  	destroy_workqueue(mb->wq);
  	return ret;
  }
  
  static int micro_batt_remove(struct platform_device *pdev)
  
  {
  	struct micro_battery *mb = platform_get_drvdata(pdev);
  
  	power_supply_unregister(micro_ac_power);
  	power_supply_unregister(micro_batt_power);
  	cancel_delayed_work_sync(&mb->update);
  	destroy_workqueue(mb->wq);
  
  	return 0;
  }
  
  static int __maybe_unused micro_batt_suspend(struct device *dev)
  {
  	struct micro_battery *mb = dev_get_drvdata(dev);
  
  	cancel_delayed_work_sync(&mb->update);
  	return 0;
  }
  
  static int __maybe_unused micro_batt_resume(struct device *dev)
  {
  	struct micro_battery *mb = dev_get_drvdata(dev);
  
  	queue_delayed_work(mb->wq, &mb->update, msecs_to_jiffies(BATT_PERIOD));
  	return 0;
  }
  
  static const struct dev_pm_ops micro_batt_dev_pm_ops = {
  	SET_SYSTEM_SLEEP_PM_OPS(micro_batt_suspend, micro_batt_resume)
  };
  
  static struct platform_driver micro_batt_device_driver = {
  	.driver		= {
  		.name	= "ipaq-micro-battery",
  		.pm	= &micro_batt_dev_pm_ops,
  	},
  	.probe		= micro_batt_probe,
  	.remove		= micro_batt_remove,
  };
  module_platform_driver(micro_batt_device_driver);
  
  MODULE_LICENSE("GPL");
  MODULE_DESCRIPTION("driver for iPAQ Atmel micro battery");
  MODULE_ALIAS("platform:battery-ipaq-micro");
  