Cleanup battery driver

SVN-Revision: 19505

target/linux/xburst/files-2.6.32/drivers/power/jz4740-battery.c

@@ -1,11 +1,13 @@
 /*
  * Battery measurement code for Ingenic JZ SOC.
  *
+ * Copyright (C) 2009 Jiejing Zhang <[email protected]>
+ * Copyright (C) 2010, Lars-Peter Clausen <[email protected]>
+ *
  * based on tosa_battery.c
  *
  * Copyright (C) 2008 Marek Vasut <[email protected]>
- * Copyright (C) 2009 Jiejing Zhang <[email protected]>
- *
+*
  * 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.
@@ -19,50 +21,56 @@
 #include <linux/interrupt.h>
 #include <linux/platform_device.h>
 #include <linux/gpio.h>
+#include <linux/interrupt.h>
 
 #include <linux/power/jz4740-battery.h>
 #include <linux/jz4740-adc.h>
 
-struct jz_battery_info {
-	struct power_supply bat;
-	int bat_status;
-	struct jz_batt_info *pdata;
-	struct mutex work_lock;
-	struct workqueue_struct *monitor_wqueue;
-	struct delayed_work bat_work;
-};
+struct jz_battery {
+	struct jz_battery_platform_data *pdata;
+
+	int charge_irq;
 
-#define ps_to_jz_battery(x) container_of((x), struct jz_battery_info, bat);
+	int status;
+	long voltage;
 
-/*********************************************************************
- *		Battery properties
- *********************************************************************/
+	struct power_supply battery;
+	struct delayed_work work;
+};
 
-static long jz_read_bat(struct power_supply *psy)
+static inline struct jz_battery *psy_to_jz_battery(struct power_supply *psy)
 {
-	struct jz_battery_info *bat_info = ps_to_jz_battery(psy);
+	return container_of(psy, struct jz_battery, battery);
+}
+
+static long jz_battery_read_voltage(struct jz_battery *jz_battery)
+{
+	struct device *adc = jz_battery->battery.dev->parent->parent;
 	enum jz_adc_battery_scale scale;
 
-	if (bat_info->pdata->max_voltag > 2500000)
+	if (jz_battery->pdata->info.voltage_max_design > 2500000)
 		scale = JZ_ADC_BATTERY_SCALE_7V5;
 	else
 		scale = JZ_ADC_BATTERY_SCALE_2V5;
 
-	return jz4740_adc_read_battery_voltage(psy->dev->parent->parent, scale);
+	return jz4740_adc_read_battery_voltage(adc, scale);
 }
 
-static int jz_bat_get_capacity(struct power_supply *psy)
+static int jz_battery_get_capacity(struct power_supply *psy)
 {
+	struct jz_battery *jz_battery = psy_to_jz_battery(psy);
+	struct power_supply_info *info = &jz_battery->pdata->info;
+	long voltage;
 	int ret;
-	struct jz_battery_info *bat_info = ps_to_jz_battery(psy);
+	int voltage_span;
 
-	ret = jz_read_bat(psy);
+	voltage = jz_battery_read_voltage(jz_battery);
 
-	if (ret < 0)
-		return ret;
+	if (voltage < 0)
+		return voltage;
 
-	ret = (ret - bat_info->pdata->min_voltag) * 100
-		/ (bat_info->pdata->max_voltag - bat_info->pdata->min_voltag);
+	voltage_span = info->voltage_max_design - info->voltage_min_design;
+	ret = ((voltage - info->voltage_min_design) * 100) / voltage_span;
 
 	if (ret > 100)
 		ret = 100;
@@ -72,46 +80,41 @@ static int jz_bat_get_capacity(struct power_supply *psy)
 	return ret;
 }
 
-static int jz_bat_get_property(struct power_supply *psy,
+static int jz_battery_get_property(struct power_supply *psy,
 				enum power_supply_property psp,
 				union power_supply_propval *val)
 {
-	struct jz_battery_info *bat_info = ps_to_jz_battery(psy)
-	
+	struct jz_battery *jz_battery = psy_to_jz_battery(psy);
+	struct power_supply_info *info = &jz_battery->pdata->info;
+	long voltage;
+
 	switch (psp) {
 	case POWER_SUPPLY_PROP_STATUS:
-		val->intval = bat_info->bat_status;
+		val->intval = jz_battery->status;
 		break;
 	case POWER_SUPPLY_PROP_TECHNOLOGY:
-		val->intval = bat_info->pdata->batt_tech;
+		val->intval = jz_battery->pdata->info.technology;
 		break;
 	case POWER_SUPPLY_PROP_HEALTH:
-		if(jz_read_bat(psy) < bat_info->pdata->min_voltag) {
-			dev_dbg(psy->dev, "%s: battery is dead,"
-				"voltage too low!\n", __func__);
+		voltage = jz_battery_read_voltage(jz_battery);
+		if (voltage < info->voltage_min_design)
 			val->intval = POWER_SUPPLY_HEALTH_DEAD;
-		} else {
-			dev_dbg(psy->dev, "%s: battery is good,"
-				"voltage normal.\n", __func__);
+		else
 			val->intval = POWER_SUPPLY_HEALTH_GOOD;
-		}
 		break;
 	case POWER_SUPPLY_PROP_CAPACITY:
-		val->intval = jz_bat_get_capacity(psy);
-		dev_dbg(psy->dev, "%s: battery_capacity = %d\n",
-			__func__, val->intval);
+		val->intval = jz_battery_get_capacity(psy);
 		break;
 	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
-		val->intval = jz_read_bat(psy);
+		val->intval = jz_battery_read_voltage(jz_battery);
 		if (val->intval < 0)
 			return val->intval;
 		break;
-	case POWER_SUPPLY_PROP_VOLTAGE_MAX:
 	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
-		val->intval = bat_info->pdata->max_voltag;
+		val->intval = info->voltage_max_design;
 		break;
 	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
-		val->intval = bat_info->pdata->min_voltag;
+		val->intval = info->voltage_min_design;
 		break;
 	case POWER_SUPPLY_PROP_PRESENT:
 		val->intval = 1;
@@ -122,210 +125,225 @@ static int jz_bat_get_property(struct power_supply *psy,
 	return 0;
 }
 
-static void jz_bat_external_power_changed(struct power_supply *psy)
+static void jz_battery_external_power_changed(struct power_supply *psy)
 {
-	struct jz_battery_info *bat_info = ps_to_jz_battery(psy);
-	
-	cancel_delayed_work(&bat_info->bat_work);
-	queue_delayed_work(bat_info->monitor_wqueue, &bat_info->bat_work, HZ / 8);
+	struct jz_battery *jz_battery = psy_to_jz_battery(psy);
+
+	cancel_delayed_work(&jz_battery->work);
+	schedule_delayed_work(&jz_battery->work, 0);
 }
 
-static char *status_text[] = {
-	[POWER_SUPPLY_STATUS_UNKNOWN] =		"Unknown",
-	[POWER_SUPPLY_STATUS_CHARGING] =	"Charging",
-	[POWER_SUPPLY_STATUS_DISCHARGING] =	"Discharging",
-	[POWER_SUPPLY_STATUS_NOT_CHARGING] =    "Not charging",
-};
+static irqreturn_t jz_battery_charge_irq(int irq, void *data)
+{
+	struct jz_battery *jz_battery = data;
 
-static void jz_bat_update(struct power_supply *psy)
+	cancel_delayed_work(&jz_battery->work);
+	schedule_delayed_work(&jz_battery->work, 0);
+
+	return IRQ_HANDLED;
+}
+
+static void jz_battery_update(struct jz_battery *jz_battery)
 {
-	struct jz_battery_info *bat_info = ps_to_jz_battery(psy);
-		
-	int old_status = bat_info->bat_status;
-	static unsigned long old_batt_vol = 0;
-	unsigned long batt_vol = jz_read_bat(psy);
-	
-	mutex_lock(&bat_info->work_lock);
-
-	if (gpio_is_valid(bat_info->pdata->charg_stat_gpio)) {
-		if(!gpio_get_value(bat_info->pdata->charg_stat_gpio))
-			bat_info->bat_status = POWER_SUPPLY_STATUS_CHARGING;
+	int status;
+	long voltage;
+	long voltage_difference;
+	bool has_changed = 0;
+
+	if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {
+		int is_charging;
+
+		is_charging = gpio_get_value(jz_battery->pdata->gpio_charge);
+		is_charging ^= jz_battery->pdata->gpio_charge_active_low;
+		if (is_charging)
+			status = POWER_SUPPLY_STATUS_CHARGING;
 		else
-			bat_info->bat_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
-		dev_dbg(psy->dev, "%s: battery status=%s\n",
-			__func__, status_text[bat_info->bat_status]);
-		
-		if (old_status != bat_info->bat_status) {
-			dev_dbg(psy->dev, "%s %s -> %s\n",
-				psy->name,
-				status_text[old_status],
-				status_text[bat_info->bat_status]);
-
-			power_supply_changed(psy);
+			status = POWER_SUPPLY_STATUS_NOT_CHARGING;
+
+		if (status != jz_battery->status) {
+			jz_battery->status = status;
+			has_changed = 1;
 		}
 	}
 
-	if (old_batt_vol - batt_vol > 50000) {
-		dev_dbg(psy->dev, "voltage change : %ld -> %ld\n",
-			old_batt_vol, batt_vol);
-		power_supply_changed(psy);
-		old_batt_vol = batt_vol;
+	voltage = jz_battery_read_voltage(jz_battery);
+	voltage_difference = voltage - jz_battery->voltage;
+	if (voltage_difference > 50000 || voltage_difference < 50000) {
+		jz_battery->voltage = voltage;
+		has_changed = 1;
 	}
-
-	mutex_unlock(&bat_info->work_lock);
+	if (has_changed)
+		power_supply_changed(&jz_battery->battery);
 }
 
-static enum power_supply_property jz_bat_main_props[] = {
+static enum power_supply_property jz_battery_properties[] = {
 	POWER_SUPPLY_PROP_STATUS,
 	POWER_SUPPLY_PROP_TECHNOLOGY,
 	POWER_SUPPLY_PROP_HEALTH,
-	POWER_SUPPLY_PROP_CAPACITY, /* in percents! */
+	POWER_SUPPLY_PROP_CAPACITY,
 	POWER_SUPPLY_PROP_VOLTAGE_NOW,
-	POWER_SUPPLY_PROP_VOLTAGE_MAX,
+	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
 	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 	POWER_SUPPLY_PROP_PRESENT,
 };
 
-struct power_supply bat_ps = {
-	.name			= "battery",
-	.type			= POWER_SUPPLY_TYPE_BATTERY,
-	.properties		= jz_bat_main_props,
-	.num_properties		= ARRAY_SIZE(jz_bat_main_props),
-	.get_property		= jz_bat_get_property,
-	.external_power_changed = jz_bat_external_power_changed,
-	.use_for_apm		= 1,
-};
-
-static void jz_bat_work(struct work_struct *work)
+static void jz_battery_work(struct work_struct *work)
 {
-	/* query interval too small will increase system workload*/
+	/* Too small interval will increase system workload */
 	const int interval = HZ * 30;
-	struct jz_battery_info *bat_info = container_of(work,struct jz_battery_info, bat_work.work);
-
-	jz_bat_update(&bat_info->bat);
-	queue_delayed_work(bat_info->monitor_wqueue,
-			   &bat_info->bat_work, interval);
-}
-
-#ifdef CONFIG_PM
-static int jz_bat_suspend(struct platform_device *pdev, pm_message_t state)
-{
-	struct jz_battery_info *bat_info = platform_get_drvdata(pdev);
-	
-	bat_info->bat_status =  POWER_SUPPLY_STATUS_UNKNOWN;
-
-	return 0;
-}
-
-static int jz_bat_resume(struct platform_device *pdev)
-{
-	struct jz_battery_info *bat_info = platform_get_drvdata(pdev);
-
-	bat_info->bat_status =  POWER_SUPPLY_STATUS_UNKNOWN;
-
-	cancel_delayed_work(&bat_info->bat_work);
-	queue_delayed_work(bat_info->monitor_wqueue, &bat_info->bat_work, HZ/10);
+	struct jz_battery *jz_battery = container_of(work, struct jz_battery,
+					    work.work);
 
-	return 0;
+	jz_battery_update(jz_battery);
+	schedule_delayed_work(&jz_battery->work, interval);
 }
-#else
-#define jz_bat_suspend NULL
-#define jz_bat_resume NULL
-#endif
 
-static int jz_bat_probe(struct platform_device *pdev)
+static int jz_battery_probe(struct platform_device *pdev)
 {
 	int ret = 0;
-	struct jz_battery_info *bat_info;
+	struct jz_battery_platform_data *pdata = pdev->dev.platform_data;
+	struct jz_battery *jz_battery;
+	struct power_supply *battery;
 
 	if (!pdev->dev.platform_data) {
-		dev_err(&pdev->dev, "Please set battery info\n");
+		dev_err(&pdev->dev, "No platform data\n");
 		return -EINVAL;
 	}
 
-	bat_info = kzalloc(sizeof(struct jz_battery_info), GFP_KERNEL);
+	jz_battery = kzalloc(sizeof(*jz_battery), GFP_KERNEL);
 
-	if (!bat_info) {
+	if (!jz_battery) {
+		dev_err(&pdev->dev, "Failed to allocate driver structure\n");
 		return -ENOMEM;
 	}
 
-	platform_set_drvdata(pdev, bat_info);
-	bat_info->pdata = pdev->dev.platform_data;
-	bat_info->bat = bat_ps;
-	mutex_init(&bat_info->work_lock);
-	INIT_DELAYED_WORK(&bat_info->bat_work, jz_bat_work);
+	battery = &jz_battery->battery;
+	battery->name = pdata->info.name;
+	battery->type = POWER_SUPPLY_TYPE_BATTERY;
+	battery->properties	= jz_battery_properties;
+	battery->num_properties	= ARRAY_SIZE(jz_battery_properties);
+	battery->get_property = jz_battery_get_property;
+	battery->external_power_changed = jz_battery_external_power_changed;
+	battery->use_for_apm = 1;
+
+	jz_battery->pdata = pdata;
 
-	if (gpio_is_valid(bat_info->pdata->charg_stat_gpio)) {
-		ret = gpio_request(bat_info->pdata->charg_stat_gpio, "CHARG STAT");
+	INIT_DELAYED_WORK(&jz_battery->work, jz_battery_work);
+
+	if (gpio_is_valid(pdata->gpio_charge)) {
+		ret = gpio_request(pdata->gpio_charge, dev_name(&pdev->dev));
 		if (ret) {
 			dev_err(&pdev->dev, "charger state gpio request failed.\n");
-			goto err_charg_gpio_request;
+			goto err_free;
 		}
-		ret = gpio_direction_input(bat_info->pdata->charg_stat_gpio);
+		ret = gpio_direction_input(pdata->gpio_charge);
 		if (ret) {
 			dev_err(&pdev->dev, "charger state gpio set direction failed.\n");
-			goto err_charg_gpio_direction;
+			goto err_free_gpio;
 		}
 
-		ret = power_supply_register(&pdev->dev, &bat_info->bat);
-		if (ret) {
-			dev_err(&pdev->dev, "power supply battery register failed.\n");
-			goto err_power_register_bat;
-		} else {
-			bat_info->monitor_wqueue = create_singlethread_workqueue("jz_battery");
-			if (!bat_info->monitor_wqueue) {
-				return -ESRCH;
+		jz_battery->charge_irq = gpio_to_irq(pdata->gpio_charge);
+
+		if (jz_battery->charge_irq >= 0) {
+			ret = request_irq(jz_battery->charge_irq,
+				    jz_battery_charge_irq,
+				    IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
+				    dev_name(&pdev->dev), jz_battery);
+			if (ret) {
+				dev_err(&pdev->dev, "Failed to request charge irq: %d\n", ret);
+				goto err_free_gpio;
 			}
-			queue_delayed_work(bat_info->monitor_wqueue, &bat_info->bat_work, HZ * 1);
 		}
+	} else {
+		jz_battery->charge_irq = -1;
 	}
-	printk(KERN_INFO "jz_bat init success.\n");
-	return ret;
 
-err_power_register_bat:
-err_charg_gpio_direction:
-	gpio_free(bat_info->pdata->charg_stat_gpio);
-err_charg_gpio_request:
-	kfree(bat_info);
+
+	ret = power_supply_register(&pdev->dev, &jz_battery->battery);
+	if (ret) {
+		dev_err(&pdev->dev, "power supply battery register failed.\n");
+		goto err_free_irq;
+	}
+
+	platform_set_drvdata(pdev, jz_battery);
+	schedule_delayed_work(&jz_battery->work, 0);
+
+	return 0;
+
+err_free_irq:
+	if (jz_battery->charge_irq >= 0)
+		free_irq(jz_battery->charge_irq, jz_battery);
+err_free_gpio:
+	if (gpio_is_valid(pdata->gpio_charge))
+		gpio_free(jz_battery->pdata->gpio_charge);
+err_free:
+	kfree(jz_battery);
 	return ret;
 }
 
-static int jz_bat_remove(struct platform_device *pdev)
+static int jz_battery_remove(struct platform_device *pdev)
 {
-	struct jz_battery_info *bat_info = platform_get_drvdata(pdev);
+	struct jz_battery *jz_battery = platform_get_drvdata(pdev);
 
-	if (bat_info->pdata) {
-		if (gpio_is_valid(bat_info->pdata->charg_stat_gpio))
-			gpio_free(bat_info->pdata->charg_stat_gpio);
+	cancel_delayed_work_sync(&jz_battery->work);
+
+	if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {
+		if (jz_battery->charge_irq >= 0)
+			free_irq(jz_battery->charge_irq, jz_battery);
+		gpio_free(jz_battery->pdata->gpio_charge);
 	}
 
-	power_supply_unregister(&bat_ps);
+	power_supply_unregister(&jz_battery->battery);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int jz_battery_suspend(struct platform_device *pdev, pm_message_t state)
+{
+	struct jz_battery *jz_battery = platform_get_drvdata(pdev);
+
+	cancel_delayed_work_sync(&jz_battery->work);
+	jz_battery->status =  POWER_SUPPLY_STATUS_UNKNOWN;
 
 	return 0;
 }
 
-static struct platform_driver jz_bat_driver = {
-	.probe		= jz_bat_probe,
-	.remove		= __devexit_p(jz_bat_remove),
-	.suspend	= jz_bat_suspend,
-	.resume		= jz_bat_resume,
+static int jz_battery_resume(struct platform_device *pdev)
+{
+	struct jz_battery *jz_battery = platform_get_drvdata(pdev);
+
+	schedule_delayed_work(&jz_battery->work, 0);
+
+	return 0;
+}
+#else
+#define jz_battery_suspend NULL
+#define jz_battery_resume NULL
+#endif
+
+static struct platform_driver jz_battery_driver = {
+	.probe		= jz_battery_probe,
+	.remove		= __devexit_p(jz_battery_remove),
+	.suspend	= jz_battery_suspend,
+	.resume		= jz_battery_resume,
 	.driver = {
 		.name = "jz4740-battery",
 		.owner = THIS_MODULE,
 	},
 };
 
-static int __init jz_bat_init(void)
+static int __init jz_battery_init(void)
 {
-	return platform_driver_register(&jz_bat_driver);
+	return platform_driver_register(&jz_battery_driver);
 }
-module_init(jz_bat_init);
+module_init(jz_battery_init);
 
-static void __exit jz_bat_exit(void)
+static void __exit jz_battery_exit(void)
 {
-	platform_driver_unregister(&jz_bat_driver);
+	platform_driver_unregister(&jz_battery_driver);
 }
-module_exit(jz_bat_exit);
+module_exit(jz_battery_exit);
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Jiejing Zhang <[email protected]>");

target/linux/xburst/files-2.6.32/include/linux/power/jz4740-battery.h

@@ -15,12 +15,10 @@
 #ifndef __JZ4740_BATTERY_H
 #define __JZ4740_BATTERY_H
 
-struct jz_batt_info {
-	int charg_stat_gpio;	/* GPIO port of Charger state */
-
-	int min_voltag;		/* Mininal battery voltage in uV */
-	int max_voltag;		/* Maximum battery voltage in uV */
-	int batt_tech;		/* Battery technology */
+struct jz_battery_platform_data {
+	struct power_supply_info info;
+	int gpio_charge;	/* GPIO port of Charger state */
+	int gpio_charge_active_low;
 };
 
 #endif