drivers/power/tps65090-charger.c - linux - Git at Google

 /*
  * Battery charger driver for TI's tps65090
  *
  * Copyright (c) 2013, NVIDIA CORPORATION.  All rights reserved.

  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
  * version 2, as published by the Free Software Foundation.

  * This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
  */
 #include <linux/delay.h>
 #include <linux/err.h>
 #include <linux/freezer.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
 #include <linux/kthread.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/power_supply.h>
 #include <linux/slab.h>

 #include <linux/mfd/tps65090.h>

 #define TPS65090_CHARGER_ENABLE	BIT(0)
 #define TPS65090_VACG		BIT(1)
 #define TPS65090_NOITERM	BIT(5)

 #define POLL_INTERVAL		(HZ * 2)	/* Used when no irq */

 struct tps65090_charger {
 	struct	device	*dev;
 	int	ac_online;
 	int	prev_ac_online;
 	int	irq;
 	struct task_struct	*poll_task;
 	bool			passive_mode;
 	struct power_supply	*ac;
 	struct tps65090_platform_data *pdata;
 };

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

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

 	if (charger->passive_mode)
 		return 0;

 	ret = tps65090_write(charger->dev->parent, TPS65090_REG_CG_CTRL5,
 			TPS65090_NOITERM);
 	if (ret < 0) {
 		dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
 			__func__, TPS65090_REG_CG_CTRL5);
 		return ret;
 	}
 	return 0;
 }

 static int tps65090_enable_charging(struct tps65090_charger *charger)
 {
 	int ret;
 	uint8_t ctrl0 = 0;

 	if (charger->passive_mode)
 		return 0;

 	ret = tps65090_read(charger->dev->parent, TPS65090_REG_CG_CTRL0,
 			    &ctrl0);
 	if (ret < 0) {
 		dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
 				__func__, TPS65090_REG_CG_CTRL0);
 		return ret;
 	}

 	ret = tps65090_write(charger->dev->parent, TPS65090_REG_CG_CTRL0,
 				(ctrl0 | TPS65090_CHARGER_ENABLE));
 	if (ret < 0) {
 		dev_err(charger->dev, "%s(): error writing in register 0x%x\n",
 				__func__, TPS65090_REG_CG_CTRL0);
 		return ret;
 	}
 	return 0;
 }

 static int tps65090_config_charger(struct tps65090_charger *charger)
 {
 	uint8_t intrmask = 0;
 	int ret;

 	if (charger->passive_mode)
 		return 0;

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

 	/* Enable the VACG interrupt for AC power detect */
 	ret = tps65090_read(charger->dev->parent, TPS65090_REG_INTR_MASK,
 			    &intrmask);
 	if (ret < 0) {
 		dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
 			__func__, TPS65090_REG_INTR_MASK);
 		return ret;
 	}

 	ret = tps65090_write(charger->dev->parent, TPS65090_REG_INTR_MASK,
 			     (intrmask | TPS65090_VACG));
 	if (ret < 0) {
 		dev_err(charger->dev, "%s(): error writing in register 0x%x\n",
 			__func__, TPS65090_REG_CG_CTRL0);
 		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 = power_supply_get_drvdata(psy);

 	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 status1 = 0;
 	uint8_t intrsts = 0;

 	ret = tps65090_read(charger->dev->parent, TPS65090_REG_CG_STATUS1,
 			    &status1);
 	if (ret < 0) {
 		dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n",
 				__func__, TPS65090_REG_CG_STATUS1);
 		return IRQ_HANDLED;
 	}
 	msleep(75);
 	ret = tps65090_read(charger->dev->parent, TPS65090_REG_INTR_STS,
 			    &intrsts);
 	if (ret < 0) {
 		dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n",
 				__func__, TPS65090_REG_INTR_STS);
 		return IRQ_HANDLED;
 	}

 	if (intrsts & TPS65090_VACG) {
 		ret = tps65090_enable_charging(charger);
 		if (ret < 0)
 			return IRQ_HANDLED;
 		charger->ac_online = 1;
 	} else {
 		charger->ac_online = 0;
 	}

 	/* Clear interrupts. */
 	if (!charger->passive_mode) {
 		ret = tps65090_write(charger->dev->parent,
 				     TPS65090_REG_INTR_STS, 0x00);
 		if (ret < 0) {
 			dev_err(charger->dev,
 				"%s(): Error in writing reg 0x%x\n",
 				__func__, TPS65090_REG_INTR_STS);
 		}
 	}

 	if (charger->prev_ac_online != charger->ac_online)
 		power_supply_changed(charger->ac);

 	return IRQ_HANDLED;
 }

 static struct tps65090_platform_data *
 		tps65090_parse_dt_charger_data(struct platform_device *pdev)
 {
 	struct tps65090_platform_data *pdata;
 	struct device_node *np = pdev->dev.of_node;
 	unsigned int prop;

 	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
 	if (!pdata) {
 		dev_err(&pdev->dev, "Memory alloc for tps65090_pdata failed\n");
 		return NULL;
 	}

 	prop = of_property_read_bool(np, "ti,enable-low-current-chrg");
 	pdata->enable_low_current_chrg = prop;

 	pdata->irq_base = -1;

 	return pdata;

 }

 static int tps65090_charger_poll_task(void *data)
 {
 	set_freezable();

 	while (!kthread_should_stop()) {
 		schedule_timeout_interruptible(POLL_INTERVAL);
 		try_to_freeze();
 		tps65090_charger_isr(-1, data);
 	}
 	return 0;
 }

 static const struct power_supply_desc tps65090_charger_desc = {
 	.name			= "tps65090-ac",
 	.type			= POWER_SUPPLY_TYPE_MAINS,
 	.get_property		= tps65090_ac_get_property,
 	.properties		= tps65090_ac_props,
 	.num_properties		= ARRAY_SIZE(tps65090_ac_props),
 };

 static int tps65090_charger_probe(struct platform_device *pdev)
 {
 	struct tps65090_charger *cdata;
 	struct tps65090_platform_data *pdata;
 	struct power_supply_config psy_cfg = {};
 	uint8_t status1 = 0;
 	int ret;
 	int irq;

 	pdata = dev_get_platdata(pdev->dev.parent);

 	if (IS_ENABLED(CONFIG_OF) && !pdata && pdev->dev.of_node)
 		pdata = tps65090_parse_dt_charger_data(pdev);

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

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

 	platform_set_drvdata(pdev, cdata);

 	cdata->dev			= &pdev->dev;
 	cdata->pdata			= pdata;

 	psy_cfg.supplied_to		= pdata->supplied_to;
 	psy_cfg.num_supplicants		= pdata->num_supplicants;
 	psy_cfg.of_node			= pdev->dev.of_node;
 	psy_cfg.drv_data		= cdata;

 	cdata->ac = power_supply_register(&pdev->dev, &tps65090_charger_desc,
 			&psy_cfg);
 	if (IS_ERR(cdata->ac)) {
 		dev_err(&pdev->dev, "failed: power supply register\n");
 		return PTR_ERR(cdata->ac);
 	}

 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0)
 		irq = -ENXIO;
 	cdata->irq = irq;

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

 	/* Check for charger presence */
 	ret = tps65090_read(cdata->dev->parent, TPS65090_REG_CG_STATUS1,
 			&status1);
 	if (ret < 0) {
 		dev_err(cdata->dev, "%s(): Error in reading reg 0x%x", __func__,
 			TPS65090_REG_CG_STATUS1);
 		goto fail_unregister_supply;
 	}

 	if (status1 != 0) {
 		ret = tps65090_enable_charging(cdata);
 		if (ret < 0) {
 			dev_err(cdata->dev, "error enabling charger\n");
 			goto fail_unregister_supply;
 		}
 		cdata->ac_online = 1;
 		power_supply_changed(cdata->ac);
 	}

 	if (irq != -ENXIO) {
 		ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
 			tps65090_charger_isr, 0, "tps65090-charger", cdata);
 		if (ret) {
 			dev_err(cdata->dev,
 				"Unable to register irq %d err %d\n", irq,
 				ret);
 			goto fail_unregister_supply;
 		}
 	} else {
 		cdata->poll_task = kthread_run(tps65090_charger_poll_task,
 					      cdata, "ktps65090charger");
 		cdata->passive_mode = true;
 		if (IS_ERR(cdata->poll_task)) {
 			ret = PTR_ERR(cdata->poll_task);
 			dev_err(cdata->dev,
 				"Unable to run kthread err %d\n", ret);
 			goto fail_unregister_supply;
 		}
 	}

 	return 0;

 fail_unregister_supply:
 	power_supply_unregister(cdata->ac);

 	return ret;
 }

 static int tps65090_charger_remove(struct platform_device *pdev)
 {
 	struct tps65090_charger *cdata = platform_get_drvdata(pdev);

 	if (cdata->irq == -ENXIO)
 		kthread_stop(cdata->poll_task);
 	power_supply_unregister(cdata->ac);

 	return 0;
 }

 static const struct of_device_id of_tps65090_charger_match[] = {
 	{ .compatible = "ti,tps65090-charger", },
 	{ /* end */ }
 };

 static struct platform_driver tps65090_charger_driver = {
 	.driver	= {
 		.name	= "tps65090-charger",
 		.of_match_table = of_tps65090_charger_match,
 	},
 	.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");
	/*
	* Battery charger driver for TI's tps65090
	*
	* Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved.

	* This program is free software; you can redistribute it and/or modify it
	* under the terms and conditions of the GNU General Public License,
	* version 2, as published by the Free Software Foundation.

	* This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
	*/
	#include <linux/delay.h>
	#include <linux/err.h>
	#include <linux/freezer.h>
	#include <linux/init.h>
	#include <linux/interrupt.h>
	#include <linux/kernel.h>
	#include <linux/kthread.h>
	#include <linux/module.h>
	#include <linux/of_device.h>
	#include <linux/platform_device.h>
	#include <linux/power_supply.h>
	#include <linux/slab.h>

	#include <linux/mfd/tps65090.h>

	#define TPS65090_CHARGER_ENABLE BIT(0)
	#define TPS65090_VACG BIT(1)
	#define TPS65090_NOITERM BIT(5)

	#define POLL_INTERVAL (HZ * 2) /* Used when no irq */

	struct tps65090_charger {
	struct device *dev;
	int ac_online;
	int prev_ac_online;
	int irq;
	struct task_struct *poll_task;
	bool passive_mode;
	struct power_supply *ac;
	struct tps65090_platform_data *pdata;
	};

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

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

	if (charger->passive_mode)
	return 0;

	ret = tps65090_write(charger->dev->parent, TPS65090_REG_CG_CTRL5,
	TPS65090_NOITERM);
	if (ret < 0) {
	dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
	__func__, TPS65090_REG_CG_CTRL5);
	return ret;
	}
	return 0;
	}

	static int tps65090_enable_charging(struct tps65090_charger *charger)
	{
	int ret;
	uint8_t ctrl0 = 0;

	if (charger->passive_mode)
	return 0;

	ret = tps65090_read(charger->dev->parent, TPS65090_REG_CG_CTRL0,
	&ctrl0);
	if (ret < 0) {
	dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
	__func__, TPS65090_REG_CG_CTRL0);
	return ret;
	}

	ret = tps65090_write(charger->dev->parent, TPS65090_REG_CG_CTRL0,
	(ctrl0 \| TPS65090_CHARGER_ENABLE));
	if (ret < 0) {
	dev_err(charger->dev, "%s(): error writing in register 0x%x\n",
	__func__, TPS65090_REG_CG_CTRL0);
	return ret;
	}
	return 0;
	}

	static int tps65090_config_charger(struct tps65090_charger *charger)
	{
	uint8_t intrmask = 0;
	int ret;

	if (charger->passive_mode)
	return 0;

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

	/* Enable the VACG interrupt for AC power detect */
	ret = tps65090_read(charger->dev->parent, TPS65090_REG_INTR_MASK,
	&intrmask);
	if (ret < 0) {
	dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
	__func__, TPS65090_REG_INTR_MASK);
	return ret;
	}

	ret = tps65090_write(charger->dev->parent, TPS65090_REG_INTR_MASK,
	(intrmask \| TPS65090_VACG));
	if (ret < 0) {
	dev_err(charger->dev, "%s(): error writing in register 0x%x\n",
	__func__, TPS65090_REG_CG_CTRL0);
	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 = power_supply_get_drvdata(psy);

	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 status1 = 0;
	uint8_t intrsts = 0;

	ret = tps65090_read(charger->dev->parent, TPS65090_REG_CG_STATUS1,
	&status1);
	if (ret < 0) {
	dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n",
	__func__, TPS65090_REG_CG_STATUS1);
	return IRQ_HANDLED;
	}
	msleep(75);
	ret = tps65090_read(charger->dev->parent, TPS65090_REG_INTR_STS,
	&intrsts);
	if (ret < 0) {
	dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n",
	__func__, TPS65090_REG_INTR_STS);
	return IRQ_HANDLED;
	}

	if (intrsts & TPS65090_VACG) {
	ret = tps65090_enable_charging(charger);
	if (ret < 0)
	return IRQ_HANDLED;
	charger->ac_online = 1;
	} else {
	charger->ac_online = 0;
	}

	/* Clear interrupts. */
	if (!charger->passive_mode) {
	ret = tps65090_write(charger->dev->parent,
	TPS65090_REG_INTR_STS, 0x00);
	if (ret < 0) {
	dev_err(charger->dev,
	"%s(): Error in writing reg 0x%x\n",
	__func__, TPS65090_REG_INTR_STS);
	}
	}

	if (charger->prev_ac_online != charger->ac_online)
	power_supply_changed(charger->ac);

	return IRQ_HANDLED;
	}

	static struct tps65090_platform_data *
	tps65090_parse_dt_charger_data(struct platform_device *pdev)
	{
	struct tps65090_platform_data *pdata;
	struct device_node *np = pdev->dev.of_node;
	unsigned int prop;

	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata) {
	dev_err(&pdev->dev, "Memory alloc for tps65090_pdata failed\n");
	return NULL;
	}

	prop = of_property_read_bool(np, "ti,enable-low-current-chrg");
	pdata->enable_low_current_chrg = prop;

	pdata->irq_base = -1;

	return pdata;

	}

	static int tps65090_charger_poll_task(void *data)
	{
	set_freezable();

	while (!kthread_should_stop()) {
	schedule_timeout_interruptible(POLL_INTERVAL);
	try_to_freeze();
	tps65090_charger_isr(-1, data);
	}
	return 0;
	}

	static const struct power_supply_desc tps65090_charger_desc = {
	.name = "tps65090-ac",
	.type = POWER_SUPPLY_TYPE_MAINS,
	.get_property = tps65090_ac_get_property,
	.properties = tps65090_ac_props,
	.num_properties = ARRAY_SIZE(tps65090_ac_props),
	};

	static int tps65090_charger_probe(struct platform_device *pdev)
	{
	struct tps65090_charger *cdata;
	struct tps65090_platform_data *pdata;
	struct power_supply_config psy_cfg = {};
	uint8_t status1 = 0;
	int ret;
	int irq;

	pdata = dev_get_platdata(pdev->dev.parent);

	if (IS_ENABLED(CONFIG_OF) && !pdata && pdev->dev.of_node)
	pdata = tps65090_parse_dt_charger_data(pdev);

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

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

	platform_set_drvdata(pdev, cdata);

	cdata->dev = &pdev->dev;
	cdata->pdata = pdata;

	psy_cfg.supplied_to = pdata->supplied_to;
	psy_cfg.num_supplicants = pdata->num_supplicants;
	psy_cfg.of_node = pdev->dev.of_node;
	psy_cfg.drv_data = cdata;

	cdata->ac = power_supply_register(&pdev->dev, &tps65090_charger_desc,
	&psy_cfg);
	if (IS_ERR(cdata->ac)) {
	dev_err(&pdev->dev, "failed: power supply register\n");
	return PTR_ERR(cdata->ac);
	}

	irq = platform_get_irq(pdev, 0);
	if (irq < 0)
	irq = -ENXIO;
	cdata->irq = irq;

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

	/* Check for charger presence */
	ret = tps65090_read(cdata->dev->parent, TPS65090_REG_CG_STATUS1,
	&status1);
	if (ret < 0) {
	dev_err(cdata->dev, "%s(): Error in reading reg 0x%x", __func__,
	TPS65090_REG_CG_STATUS1);
	goto fail_unregister_supply;
	}

	if (status1 != 0) {
	ret = tps65090_enable_charging(cdata);
	if (ret < 0) {
	dev_err(cdata->dev, "error enabling charger\n");
	goto fail_unregister_supply;
	}
	cdata->ac_online = 1;
	power_supply_changed(cdata->ac);
	}

	if (irq != -ENXIO) {
	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
	tps65090_charger_isr, 0, "tps65090-charger", cdata);
	if (ret) {
	dev_err(cdata->dev,
	"Unable to register irq %d err %d\n", irq,
	ret);
	goto fail_unregister_supply;
	}
	} else {
	cdata->poll_task = kthread_run(tps65090_charger_poll_task,
	cdata, "ktps65090charger");
	cdata->passive_mode = true;
	if (IS_ERR(cdata->poll_task)) {
	ret = PTR_ERR(cdata->poll_task);
	dev_err(cdata->dev,
	"Unable to run kthread err %d\n", ret);
	goto fail_unregister_supply;
	}
	}

	return 0;

	fail_unregister_supply:
	power_supply_unregister(cdata->ac);

	return ret;
	}

	static int tps65090_charger_remove(struct platform_device *pdev)
	{
	struct tps65090_charger *cdata = platform_get_drvdata(pdev);

	if (cdata->irq == -ENXIO)
	kthread_stop(cdata->poll_task);
	power_supply_unregister(cdata->ac);

	return 0;
	}

	static const struct of_device_id of_tps65090_charger_match[] = {
	{ .compatible = "ti,tps65090-charger", },
	{ /* end */ }
	};

	static struct platform_driver tps65090_charger_driver = {
	.driver = {
	.name = "tps65090-charger",
	.of_match_table = of_tps65090_charger_match,
	},
	.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");