drivers/power/tps65090-charger.c - kernel/tegra - Git at Google

 /*
  * drivers/power/tps65090-charger.c
  *
  * Battery charger driver for TI's tps65090
  *
  * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  * more details.
  *
  * You should have received a copy of the GNU General Public License along
  * with this program; if not, write to the Free Software Foundation, Inc.,
  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  */
 #include <linux/err.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/delay.h>
 #include <linux/platform_device.h>
 #include <linux/power_supply.h>
 #include <linux/power/sbs-battery.h>
 #include <linux/mfd/tps65090.h>
 #include <linux/power/battery-charger-gauge-comm.h>

 #define TPS65090_INTR_STS	0x00
 #define TPS65090_CG_CTRL0	0x04
 #define TPS65090_CG_CTRL1	0x05
 #define TPS65090_CG_CTRL2	0x06
 #define TPS65090_CG_CTRL3	0x07
 #define TPS65090_CG_CTRL4	0x08
 #define TPS65090_CG_CTRL5	0x09
 #define TPS65090_CG_STATUS1	0x0a
 #define TPS65090_CG_STATUS2	0x0b

 #define TPS65090_NOITERM	BIT(5)
 #define CHARGER_ENABLE		0x01
 #define TPS65090_VACG		0x02

 struct tps65090_charger {
 	struct	device	*dev;
 	int	irq_base;
 	int	ac_online;
 	int	prev_ac_online;
 	struct power_supply	ac;
 	struct tps65090_charger_data *chg_pdata;
 	struct battery_charger_dev *bc_dev;
 	int status;
 };

 static enum power_supply_property tps65090_ac_props[] = {
 	POWER_SUPPLY_PROP_ONLINE,
 };

 static int tps65090_low_chrg_current(struct tps65090_charger *charger)
 {
 	int ret;

 	ret = tps65090_write(charger->dev->parent, TPS65090_CG_CTRL5,
 			TPS65090_NOITERM);
 	if (ret < 0) {
 		dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
 			__func__, TPS65090_CG_CTRL5);
 		return ret;
 	}
 	return 0;
 }

 static int tps65090_enable_charging(struct tps65090_charger *charger,
 	uint8_t enable)
 {
 	int ret;
 	uint8_t retval = 0;

 	ret = tps65090_read(charger->dev->parent, TPS65090_CG_CTRL0, &retval);
 	if (ret < 0) {
 		dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
 				__func__, TPS65090_CG_CTRL0);
 		return ret;
 	}

 	ret = tps65090_write(charger->dev->parent, TPS65090_CG_CTRL0,
 				(retval | CHARGER_ENABLE));
 	if (ret < 0) {
 		dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
 				__func__, TPS65090_CG_CTRL0);
 		return ret;
 	}
 	return 0;
 }

 static int tps65090_config_charger(struct tps65090_charger *charger)
 {
 	int ret;

 	ret = tps65090_low_chrg_current(charger);
 	if (ret < 0) {
 		dev_err(charger->dev,
 			"error configuring low charge current\n");
 		return ret;
 	}

 	return 0;
 }

 static int tps65090_ac_get_property(struct power_supply *psy,
 			enum power_supply_property psp,
 			union power_supply_propval *val)
 {
 	struct tps65090_charger *charger = container_of(psy,
 					struct tps65090_charger, ac);

 	if (psp == POWER_SUPPLY_PROP_ONLINE) {
 		val->intval = charger->ac_online;
 		charger->prev_ac_online = charger->ac_online;
 		return 0;
 	}
 	return -EINVAL;
 }

 static irqreturn_t tps65090_charger_isr(int irq, void *dev_id)
 {
 	struct tps65090_charger *charger = dev_id;
 	int ret;
 	uint8_t retval = 0;
 	uint8_t retval2 = 0;

 	ret = tps65090_read(charger->dev->parent, TPS65090_CG_STATUS1, &retval);
 	if (ret < 0) {
 		dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n",
 				__func__, TPS65090_CG_STATUS1);
 		goto error;
 	}
 	msleep(75);
 	ret = tps65090_read(charger->dev->parent, TPS65090_INTR_STS, &retval2);
 	if (ret < 0) {
 		dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n",
 				__func__, TPS65090_INTR_STS);
 		goto error;
 	}


 	if (retval2 & TPS65090_VACG) {
 		ret = tps65090_enable_charging(charger, 1);
 		if (ret < 0)
 			goto error;
 		charger->ac_online = 1;
 		charger->status = BATTERY_CHARGING;
 	} else {
 		charger->ac_online = 0;
 		charger->status = BATTERY_DISCHARGING;
 	}

 	if (charger->prev_ac_online != charger->ac_online) {
 		battery_charging_status_update(charger->bc_dev,
 				charger->status);
 		power_supply_changed(&charger->ac);
 	}
 error:
 	return IRQ_HANDLED;
 }

 static int tps65090_charger_get_status(struct battery_charger_dev *bc_dev)
 {
 	struct tps65090_charger *chip = battery_charger_get_drvdata(bc_dev);

 	return chip->status;
 }

 static struct battery_charging_ops tps65090_charger_bci_ops = {
 	.get_charging_status = tps65090_charger_get_status,
 };

 static struct battery_charger_info tps65090_charger_bci = {
 	.cell_id = 0,
 	.bc_ops = &tps65090_charger_bci_ops,
 };

 static int tps65090_charger_probe(struct platform_device *pdev)
 {
 	uint8_t retval = 0;
 	int ret;
 	struct tps65090_charger *charger_data;
 	struct tps65090_platform_data *pdata;

 	pdata = dev_get_platdata(pdev->dev.parent);
 	if (!pdata) {
 		dev_err(&pdev->dev, "%s():no platform data available\n",
 				__func__);
 		return -ENODEV;
 	}

 	charger_data = devm_kzalloc(&pdev->dev, sizeof(*charger_data),
 			GFP_KERNEL);
 	if (!charger_data) {
 		dev_err(&pdev->dev, "failed to allocate memory status\n");
 		return -ENOMEM;
 	}

 	charger_data->chg_pdata = pdata->charger_pdata;
 	if (!pdata) {
 		dev_err(&pdev->dev, "%s()No charger data,exiting\n", __func__);
 		return -ENODEV;
 	}

 	dev_set_drvdata(&pdev->dev, charger_data);

 	charger_data->dev = &pdev->dev;

 	/* Check for battery presence */
 	ret = sbs_battery_detect();
 	if (ret < 0) {
 		dev_err(charger_data->dev, "No battery. Exiting driver\n");
 		return -ENODEV;
 	}

 	if (charger_data->chg_pdata->irq_base) {
 		ret = request_threaded_irq(charger_data->chg_pdata->irq_base
 			+ TPS65090_IRQ_VAC_STATUS_CHANGE,
 			NULL, tps65090_charger_isr, 0, "tps65090-charger",
 			charger_data);
 		if (ret) {
 			dev_err(charger_data->dev, "Unable to register irq %d err %d\n",
 					charger_data->irq_base, ret);
 			return ret;
 		}
 	}

 	charger_data->ac.name		= "tps65090-ac";
 	charger_data->ac.type		= POWER_SUPPLY_TYPE_MAINS;
 	charger_data->ac.get_property	= tps65090_ac_get_property;
 	charger_data->ac.properties	= tps65090_ac_props;
 	charger_data->ac.num_properties	= ARRAY_SIZE(tps65090_ac_props);

 	ret = power_supply_register(&pdev->dev, &charger_data->ac);
 	if (ret) {
 		dev_err(&pdev->dev, "failed: power supply register\n");
 		goto fail_suppy_reg;
 	}

 	charger_data->bc_dev = battery_charger_register(&pdev->dev,
 				&tps65090_charger_bci, charger_data);
 	if (IS_ERR(charger_data->bc_dev)) {
 		ret = PTR_ERR(charger_data->bc_dev);
 		dev_err(&pdev->dev, "battery charger register failed: %d\n",
 			ret);
 		goto chg_reg_err;
 	}

 	ret = tps65090_config_charger(charger_data);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "charger config failed, err %d\n", ret);
 		goto fail_config;
 	}

 	/* Check for charger presence */
 	ret = tps65090_read(charger_data->dev->parent, TPS65090_CG_STATUS1,
 			&retval);
 	if (ret < 0) {
 		dev_err(charger_data->dev, "%s(): Error in reading reg 0x%x",
 			__func__, TPS65090_CG_STATUS1);
 		goto fail_config;
 	}

 	if (retval != 0) {
 		ret = tps65090_enable_charging(charger_data, 1);
 		if (ret < 0) {
 			dev_err(charger_data->dev, "error enabling charger\n");
 			return ret;
 		}
 		charger_data->ac_online = 1;
 		power_supply_changed(&charger_data->ac);
 	}

 	return 0;
 fail_config:
 	battery_charger_unregister(charger_data->bc_dev);
 chg_reg_err:
 	power_supply_unregister(&charger_data->ac);

 fail_suppy_reg:
 	free_irq(charger_data->irq_base, charger_data);
 	return ret;
 }

 static int tps65090_charger_remove(struct platform_device *pdev)
 {
 	struct tps65090_charger *charger = dev_get_drvdata(&pdev->dev);

 	battery_charger_unregister(charger->bc_dev);
 	power_supply_unregister(&charger->ac);
 	free_irq(charger->irq_base, charger);
 	return 0;
 }

 static struct platform_driver tps65090_charger_driver = {
 	.driver	= {
 		.name	= "tps65090-charger",
 		.owner	= THIS_MODULE,
 	},
 	.probe	= tps65090_charger_probe,
 	.remove = tps65090_charger_remove,
 };

 module_platform_driver(tps65090_charger_driver);

 MODULE_LICENSE("GPL v2");
 MODULE_AUTHOR("Syed Rafiuddin <srafiuddin@nvidia.com>");
 MODULE_DESCRIPTION("tps65090 battery charger driver");
	/*
	* drivers/power/tps65090-charger.c
	*
	* Battery charger driver for TI's tps65090
	*
	* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	* more details.
	*
	* You should have received a copy of the GNU General Public License along
	* with this program; if not, write to the Free Software Foundation, Inc.,
	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
	*/
	#include <linux/err.h>
	#include <linux/init.h>
	#include <linux/interrupt.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/slab.h>
	#include <linux/delay.h>
	#include <linux/platform_device.h>
	#include <linux/power_supply.h>
	#include <linux/power/sbs-battery.h>
	#include <linux/mfd/tps65090.h>
	#include <linux/power/battery-charger-gauge-comm.h>

	#define TPS65090_INTR_STS 0x00
	#define TPS65090_CG_CTRL0 0x04
	#define TPS65090_CG_CTRL1 0x05
	#define TPS65090_CG_CTRL2 0x06
	#define TPS65090_CG_CTRL3 0x07
	#define TPS65090_CG_CTRL4 0x08
	#define TPS65090_CG_CTRL5 0x09
	#define TPS65090_CG_STATUS1 0x0a
	#define TPS65090_CG_STATUS2 0x0b

	#define TPS65090_NOITERM BIT(5)
	#define CHARGER_ENABLE 0x01
	#define TPS65090_VACG 0x02

	struct tps65090_charger {
	struct device *dev;
	int irq_base;
	int ac_online;
	int prev_ac_online;
	struct power_supply ac;
	struct tps65090_charger_data *chg_pdata;
	struct battery_charger_dev *bc_dev;
	int status;
	};

	static enum power_supply_property tps65090_ac_props[] = {
	POWER_SUPPLY_PROP_ONLINE,
	};

	static int tps65090_low_chrg_current(struct tps65090_charger *charger)
	{
	int ret;

	ret = tps65090_write(charger->dev->parent, TPS65090_CG_CTRL5,
	TPS65090_NOITERM);
	if (ret < 0) {
	dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
	__func__, TPS65090_CG_CTRL5);
	return ret;
	}
	return 0;
	}

	static int tps65090_enable_charging(struct tps65090_charger *charger,
	uint8_t enable)
	{
	int ret;
	uint8_t retval = 0;

	ret = tps65090_read(charger->dev->parent, TPS65090_CG_CTRL0, &retval);
	if (ret < 0) {
	dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
	__func__, TPS65090_CG_CTRL0);
	return ret;
	}

	ret = tps65090_write(charger->dev->parent, TPS65090_CG_CTRL0,
	(retval \| CHARGER_ENABLE));
	if (ret < 0) {
	dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
	__func__, TPS65090_CG_CTRL0);
	return ret;
	}
	return 0;
	}

	static int tps65090_config_charger(struct tps65090_charger *charger)
	{
	int ret;

	ret = tps65090_low_chrg_current(charger);
	if (ret < 0) {
	dev_err(charger->dev,
	"error configuring low charge current\n");
	return ret;
	}

	return 0;
	}

	static int tps65090_ac_get_property(struct power_supply *psy,
	enum power_supply_property psp,
	union power_supply_propval *val)
	{
	struct tps65090_charger *charger = container_of(psy,
	struct tps65090_charger, ac);

	if (psp == POWER_SUPPLY_PROP_ONLINE) {
	val->intval = charger->ac_online;
	charger->prev_ac_online = charger->ac_online;
	return 0;
	}
	return -EINVAL;
	}

	static irqreturn_t tps65090_charger_isr(int irq, void *dev_id)
	{
	struct tps65090_charger *charger = dev_id;
	int ret;
	uint8_t retval = 0;
	uint8_t retval2 = 0;

	ret = tps65090_read(charger->dev->parent, TPS65090_CG_STATUS1, &retval);
	if (ret < 0) {
	dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n",
	__func__, TPS65090_CG_STATUS1);
	goto error;
	}
	msleep(75);
	ret = tps65090_read(charger->dev->parent, TPS65090_INTR_STS, &retval2);
	if (ret < 0) {
	dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n",
	__func__, TPS65090_INTR_STS);
	goto error;
	}


	if (retval2 & TPS65090_VACG) {
	ret = tps65090_enable_charging(charger, 1);
	if (ret < 0)
	goto error;
	charger->ac_online = 1;
	charger->status = BATTERY_CHARGING;
	} else {
	charger->ac_online = 0;
	charger->status = BATTERY_DISCHARGING;
	}

	if (charger->prev_ac_online != charger->ac_online) {
	battery_charging_status_update(charger->bc_dev,
	charger->status);
	power_supply_changed(&charger->ac);
	}
	error:
	return IRQ_HANDLED;
	}

	static int tps65090_charger_get_status(struct battery_charger_dev *bc_dev)
	{
	struct tps65090_charger *chip = battery_charger_get_drvdata(bc_dev);

	return chip->status;
	}

	static struct battery_charging_ops tps65090_charger_bci_ops = {
	.get_charging_status = tps65090_charger_get_status,
	};

	static struct battery_charger_info tps65090_charger_bci = {
	.cell_id = 0,
	.bc_ops = &tps65090_charger_bci_ops,
	};

	static int tps65090_charger_probe(struct platform_device *pdev)
	{
	uint8_t retval = 0;
	int ret;
	struct tps65090_charger *charger_data;
	struct tps65090_platform_data *pdata;

	pdata = dev_get_platdata(pdev->dev.parent);
	if (!pdata) {
	dev_err(&pdev->dev, "%s():no platform data available\n",
	__func__);
	return -ENODEV;
	}

	charger_data = devm_kzalloc(&pdev->dev, sizeof(*charger_data),
	GFP_KERNEL);
	if (!charger_data) {
	dev_err(&pdev->dev, "failed to allocate memory status\n");
	return -ENOMEM;
	}

	charger_data->chg_pdata = pdata->charger_pdata;
	if (!pdata) {
	dev_err(&pdev->dev, "%s()No charger data,exiting\n", __func__);
	return -ENODEV;
	}

	dev_set_drvdata(&pdev->dev, charger_data);

	charger_data->dev = &pdev->dev;

	/* Check for battery presence */
	ret = sbs_battery_detect();
	if (ret < 0) {
	dev_err(charger_data->dev, "No battery. Exiting driver\n");
	return -ENODEV;
	}

	if (charger_data->chg_pdata->irq_base) {
	ret = request_threaded_irq(charger_data->chg_pdata->irq_base
	+ TPS65090_IRQ_VAC_STATUS_CHANGE,
	NULL, tps65090_charger_isr, 0, "tps65090-charger",
	charger_data);
	if (ret) {
	dev_err(charger_data->dev, "Unable to register irq %d err %d\n",
	charger_data->irq_base, ret);
	return ret;
	}
	}

	charger_data->ac.name = "tps65090-ac";
	charger_data->ac.type = POWER_SUPPLY_TYPE_MAINS;
	charger_data->ac.get_property = tps65090_ac_get_property;
	charger_data->ac.properties = tps65090_ac_props;
	charger_data->ac.num_properties = ARRAY_SIZE(tps65090_ac_props);

	ret = power_supply_register(&pdev->dev, &charger_data->ac);
	if (ret) {
	dev_err(&pdev->dev, "failed: power supply register\n");
	goto fail_suppy_reg;
	}

	charger_data->bc_dev = battery_charger_register(&pdev->dev,
	&tps65090_charger_bci, charger_data);
	if (IS_ERR(charger_data->bc_dev)) {
	ret = PTR_ERR(charger_data->bc_dev);
	dev_err(&pdev->dev, "battery charger register failed: %d\n",
	ret);
	goto chg_reg_err;
	}

	ret = tps65090_config_charger(charger_data);
	if (ret < 0) {
	dev_err(&pdev->dev, "charger config failed, err %d\n", ret);
	goto fail_config;
	}

	/* Check for charger presence */
	ret = tps65090_read(charger_data->dev->parent, TPS65090_CG_STATUS1,
	&retval);
	if (ret < 0) {
	dev_err(charger_data->dev, "%s(): Error in reading reg 0x%x",
	__func__, TPS65090_CG_STATUS1);
	goto fail_config;
	}

	if (retval != 0) {
	ret = tps65090_enable_charging(charger_data, 1);
	if (ret < 0) {
	dev_err(charger_data->dev, "error enabling charger\n");
	return ret;
	}
	charger_data->ac_online = 1;
	power_supply_changed(&charger_data->ac);
	}

	return 0;
	fail_config:
	battery_charger_unregister(charger_data->bc_dev);
	chg_reg_err:
	power_supply_unregister(&charger_data->ac);

	fail_suppy_reg:
	free_irq(charger_data->irq_base, charger_data);
	return ret;
	}

	static int tps65090_charger_remove(struct platform_device *pdev)
	{
	struct tps65090_charger *charger = dev_get_drvdata(&pdev->dev);

	battery_charger_unregister(charger->bc_dev);
	power_supply_unregister(&charger->ac);
	free_irq(charger->irq_base, charger);
	return 0;
	}

	static struct platform_driver tps65090_charger_driver = {
	.driver = {
	.name = "tps65090-charger",
	.owner = THIS_MODULE,
	},
	.probe = tps65090_charger_probe,
	.remove = tps65090_charger_remove,
	};

	module_platform_driver(tps65090_charger_driver);

	MODULE_LICENSE("GPL v2");
	MODULE_AUTHOR("Syed Rafiuddin <srafiuddin@nvidia.com>");
	MODULE_DESCRIPTION("tps65090 battery charger driver");