1 files changed, 399 insertions, 0 deletions
diff --git a/drivers/power/max17085_battery.c b/drivers/power/max17085_battery.c
new file mode 100644
index 000000000000..05889cfc527a
--- /dev/null
+++ b/drivers/power/max17085_battery.c
@@ -0,0 +1,399 @@
+/*
+ * Copyright (C) 2012 Freescale Semiconductor, Inc. All Rights Reserved.
+ */
+
+/*
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+/*
+ * MAX17085 Battery driver
+ */
+
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/jiffies.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <mach/gpio.h>
+
+struct max17085_chip {
+	struct device *dev;
+
+	/*gpio*/
+	int pwr_good;
+	int ac_in;
+	int charge_now;
+	int charge_done;
+
+	struct power_supply	ac;
+	struct power_supply	bat;
+	struct delayed_work	work;
+
+	int online;
+	int health;
+	int status;
+	int voltage_uV;
+	int cap;
+};
+
+#define MAX17085_DELAY		3000
+#define MAX17085_DEF_TEMP	30
+
+static int max17085_bat_get_mfr(struct power_supply *psy,
+		union power_supply_propval *val)
+{
+	val->strval = "unknown";
+	return 0;
+}
+
+static int max17085_bat_get_tech(struct power_supply *psy,
+		union power_supply_propval *val)
+{
+	val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
+	return 0;
+}
+
+static int max17085_bat_get_cap(struct power_supply *psy,
+		union power_supply_propval *val)
+{
+	struct max17085_chip *chip = container_of(psy,
+			struct max17085_chip, bat);
+
+	val->intval = chip->cap;
+	return 0;
+}
+
+static int max17085_bat_get_volt(struct power_supply *psy,
+		union power_supply_propval *val)
+{
+	struct max17085_chip *chip = container_of(psy,
+			struct max17085_chip, bat);
+
+	val->intval = chip->voltage_uV;
+	return 0;
+}
+
+static int max17085_bat_get_property(struct power_supply *psy,
+		enum power_supply_property psp,
+		union power_supply_propval *val)
+{
+	int ret = 0;
+	struct max17085_chip *chip = container_of(psy,
+			struct max17085_chip, bat);
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_STATUS:
+		val->intval = chip->status;
+		break;
+	case POWER_SUPPLY_PROP_HEALTH:
+		val->intval = chip->health;
+		break;
+	case POWER_SUPPLY_PROP_CAPACITY:
+		ret = max17085_bat_get_cap(psy, val);
+		if (ret)
+			return ret;
+		break;
+	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+		ret = max17085_bat_get_volt(psy, val);
+		if (ret)
+			return ret;
+		break;
+	case POWER_SUPPLY_PROP_MANUFACTURER:
+		ret = max17085_bat_get_mfr(psy, val);
+		if (ret)
+			return ret;
+		break;
+	case POWER_SUPPLY_PROP_TECHNOLOGY:
+		ret = max17085_bat_get_tech(psy, val);
+		if (ret)
+			return ret;
+		break;
+	case POWER_SUPPLY_PROP_PRESENT:
+		val->intval = 1;
+		break;
+	case POWER_SUPPLY_PROP_TEMP:
+		val->intval = MAX17085_DEF_TEMP;
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+	return ret;
+}
+
+static int max17085_ac_get_property(struct power_supply *psy,
+		enum power_supply_property psp,
+		union power_supply_propval *val)
+{
+	struct max17085_chip *chip = container_of(psy,
+			struct max17085_chip, ac);
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_ONLINE:
+		val->intval = chip->online;
+		break;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+static void max17085_get_online(struct max17085_chip *chip)
+{
+	int level = gpio_get_value(chip->ac_in);
+	int cur_online = !level;
+
+	if (chip->online != cur_online) {
+		chip->online = cur_online;
+		power_supply_changed(&chip->ac);
+	}
+}
+
+static void max17085_get_health(struct max17085_chip *chip)
+{
+	int level = gpio_get_value(chip->pwr_good);
+
+	if (level && (chip->voltage_uV >= 0))
+		chip->health = POWER_SUPPLY_HEALTH_GOOD;
+	else
+		chip->health = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
+}
+
+extern int da9052_adc_read(unsigned char channel);
+#define VOLT_REG_TO_MV(val)	((val * 2500) / 1024)
+#define BATT_TO_ADC_SCALE	11
+#define DA9052_ADCMAN_ADCIN6	6
+static void max17085_get_volt(struct max17085_chip *chip)
+{
+	int val;
+	val = da9052_adc_read(DA9052_ADCMAN_ADCIN6);
+
+	/* Ignore lower 2 bits out of 10 bits due to noise */
+	val = val & 0x3fc;
+	if (val > 0)
+		chip->voltage_uV = VOLT_REG_TO_MV(val)*1000*BATT_TO_ADC_SCALE;
+	else
+		chip->voltage_uV = -1;
+}
+
+#define BATT_EMPTY_MV		9955
+#define BATT_FULL_MV		12000
+static void max17085_get_cap(struct max17085_chip *chip)
+{
+	int old_cap = chip->cap;
+
+	if (chip->voltage_uV > BATT_EMPTY_MV*1000) {
+		chip->cap = (chip->voltage_uV/1000 - BATT_EMPTY_MV) * 100/
+				(BATT_FULL_MV - BATT_EMPTY_MV);
+		if (chip->cap > 100)
+			chip->cap = 100;
+	} else
+		chip->cap = 0;
+
+	if (chip->cap != old_cap)
+		power_supply_changed(&chip->bat);
+}
+
+static void max17085_update_status(struct max17085_chip *chip)
+{
+	int old_status = chip->status;
+
+	if (chip->online) {
+		if (chip->voltage_uV/1000 < BATT_FULL_MV)
+			chip->status =
+				POWER_SUPPLY_STATUS_CHARGING;
+		else
+			chip->status =
+				POWER_SUPPLY_STATUS_NOT_CHARGING;
+	} else
+		chip->status = POWER_SUPPLY_STATUS_DISCHARGING;
+
+	if (chip->voltage_uV/1000 >= BATT_FULL_MV)
+		chip->status = POWER_SUPPLY_STATUS_FULL;
+
+	if (old_status != POWER_SUPPLY_STATUS_UNKNOWN &&
+		old_status != chip->status)
+		power_supply_changed(&chip->bat);
+
+	if (chip->cap < 20) {
+		gpio_set_value(chip->charge_now, 1);
+		gpio_set_value(chip->charge_done, 0);
+	} else if (chip->cap < 80) {
+		gpio_set_value(chip->charge_now, 1);
+		gpio_set_value(chip->charge_done, 1);
+	} else {
+		gpio_set_value(chip->charge_now, 0);
+		gpio_set_value(chip->charge_done, 1);
+	}
+}
+
+static void max17085_work(struct work_struct *work)
+{
+	struct max17085_chip *chip = container_of(work,
+			struct max17085_chip, work.work);
+
+	max17085_get_online(chip);
+	max17085_get_volt(chip);
+	max17085_get_health(chip);
+	max17085_get_cap(chip);
+	max17085_update_status(chip);
+
+	schedule_delayed_work(&chip->work, msecs_to_jiffies(MAX17085_DELAY));
+}
+
+static enum power_supply_property max17085_bat_props[] = {
+	POWER_SUPPLY_PROP_STATUS,
+	POWER_SUPPLY_PROP_PRESENT,
+	POWER_SUPPLY_PROP_HEALTH,
+	POWER_SUPPLY_PROP_TECHNOLOGY,
+	POWER_SUPPLY_PROP_VOLTAGE_NOW,
+	POWER_SUPPLY_PROP_CAPACITY,
+	POWER_SUPPLY_PROP_TEMP,
+	POWER_SUPPLY_PROP_MANUFACTURER,
+};
+
+static enum power_supply_property max17085_ac_props[] = {
+	POWER_SUPPLY_PROP_ONLINE,
+};
+
+static int max17085_bat_probe(struct platform_device *pdev)
+{
+	int ret = 0;
+	struct max17085_chip *chip;
+	struct resource *res;
+
+	chip = kzalloc(sizeof(struct max17085_chip), GFP_KERNEL);
+	if (!chip) {
+		ret = -ENOMEM;
+		goto chip_alloc_failed;
+	}
+
+	res = platform_get_resource_byname(pdev,
+			IORESOURCE_IO, "pwr-good");
+	if (res == NULL) {
+		ret = -EINVAL;
+		goto resource_failed;
+	}
+	chip->pwr_good = res->start;
+	res = platform_get_resource_byname(pdev,
+			IORESOURCE_IO, "ac-in");
+	if (res == NULL) {
+		ret = -EINVAL;
+		goto resource_failed;
+	}
+	chip->ac_in = res->start;
+	res = platform_get_resource_byname(pdev,
+			IORESOURCE_IO, "charge-now");
+	if (res == NULL) {
+		ret = -EINVAL;
+		goto resource_failed;
+	}
+	chip->charge_now = res->start;
+	res = platform_get_resource_byname(pdev,
+			IORESOURCE_IO, "charge-done");
+	if (res == NULL) {
+		ret = -EINVAL;
+		goto resource_failed;
+	}
+	chip->charge_done = res->start;
+
+	chip->dev = &pdev->dev;
+	chip->bat.name = "battery";
+	chip->bat.type = POWER_SUPPLY_TYPE_BATTERY;
+	chip->bat.properties = max17085_bat_props;
+	chip->bat.num_properties = ARRAY_SIZE(max17085_bat_props);
+	chip->bat.get_property = max17085_bat_get_property;
+	chip->bat.use_for_apm = 1;
+
+	chip->ac.name = "ac";
+	chip->ac.type = POWER_SUPPLY_TYPE_MAINS;
+	chip->ac.properties = max17085_ac_props;
+	chip->ac.num_properties = ARRAY_SIZE(max17085_ac_props);
+	chip->ac.get_property = max17085_ac_get_property;
+
+	platform_set_drvdata(pdev, chip);
+
+	ret = power_supply_register(&pdev->dev, &chip->ac);
+	if (ret) {
+		dev_err(chip->dev, "failed to register ac\n");
+		goto register_ac_failed;
+	}
+
+	ret = power_supply_register(&pdev->dev, &chip->bat);
+	if (ret) {
+		dev_err(chip->dev, "failed to register battery\n");
+		goto register_batt_failed;
+	}
+
+	max17085_get_online(chip);
+
+	INIT_DELAYED_WORK_DEFERRABLE(&chip->work, max17085_work);
+	schedule_delayed_work(&chip->work, msecs_to_jiffies(MAX17085_DELAY));
+
+	return ret;
+
+register_batt_failed:
+	power_supply_unregister(&chip->ac);
+register_ac_failed:
+resource_failed:
+	kfree(chip);
+chip_alloc_failed:
+	return ret;
+}
+
+static int max17085_bat_remove(struct platform_device *pdev)
+{
+	struct max17085_chip *chip = platform_get_drvdata(pdev);
+
+	cancel_delayed_work(&chip->work);
+	power_supply_unregister(&chip->bat);
+	power_supply_unregister(&chip->ac);
+	kfree(chip);
+
+	return 0;
+}
+
+static void max17085_bat_shutdown(struct platform_device *pdev)
+{
+	struct max17085_chip *chip = platform_get_drvdata(pdev);
+
+	cancel_delayed_work_sync(&chip->work);
+	gpio_set_value(chip->charge_now, 0);
+	gpio_set_value(chip->charge_done, 0);
+}
+
+static struct platform_driver max17085_bat_driver = {
+	.probe = max17085_bat_probe,
+	.remove = max17085_bat_remove,
+	.shutdown = max17085_bat_shutdown,
+	.driver = {
+		.name = "max17085_bat",
+	},
+
+};
+
+static int __devinit max17085_bat_init(void)
+{
+	return platform_driver_register(&max17085_bat_driver);
+}
+
+static void __devexit max17085_bat_exit(void)
+{
+	platform_driver_unregister(&max17085_bat_driver);
+}
+
+module_init(max17085_bat_init);
+module_exit(max17085_bat_exit);
+
+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
+MODULE_DESCRIPTION("MAX17085 battery driver");
+MODULE_LICENSE("GPL");