drivers/power/tps65217_charger.c - kernel/bruno - Git at Google

 /*
  * Battery charger driver for TI's tps65217
  *
  * Copyright (c) 2015, Collabora Ltd.

  * 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/>.
  */

 /*
  * Battery charger driver for TI's tps65217
  */
 #include <linux/kernel.h>
 #include <linux/kthread.h>
 #include <linux/device.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/slab.h>
 #include <linux/err.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/power_supply.h>

 #include <linux/mfd/core.h>
 #include <linux/mfd/tps65217.h>

 #define POLL_INTERVAL		(HZ * 2)

 struct tps65217_charger {
 	struct tps65217 *tps;
 	struct device *dev;
 	struct power_supply *ac;

 	int	ac_online;
 	int	prev_ac_online;

 	struct task_struct	*poll_task;
 };

 static enum power_supply_property tps65217_ac_props[] = {
 	POWER_SUPPLY_PROP_ONLINE,
 };

 static int tps65217_config_charger(struct tps65217_charger *charger)
 {
 	int ret;

 	dev_dbg(charger->dev, "%s\n", __func__);

 	/*
 	 * tps65217 rev. G, p. 31 (see p. 32 for NTC schematic)
 	 *
 	 * The device can be configured to support a 100k NTC (B = 3960) by
 	 * setting the the NTC_TYPE bit in register CHGCONFIG1 to 1. However it
 	 * is not recommended to do so. In sleep mode, the charger continues
 	 * charging the battery, but all register values are reset to default
 	 * values. Therefore, the charger would get the wrong temperature
 	 * information. If 100k NTC setting is required, please contact the
 	 * factory.
 	 *
 	 * ATTENTION, conflicting information, from p. 46
 	 *
 	 * NTC TYPE (for battery temperature measurement)
 	 *   0 – 100k (curve 1, B = 3960)
 	 *   1 – 10k  (curve 2, B = 3480) (default on reset)
 	 *
 	 */
 	ret = tps65217_clear_bits(charger->tps, TPS65217_REG_CHGCONFIG1,
 				  TPS65217_CHGCONFIG1_NTC_TYPE,
 				  TPS65217_PROTECT_NONE);
 	if (ret) {
 		dev_err(charger->dev,
 			"failed to set 100k NTC setting: %d\n", ret);
 		return ret;
 	}

 	return 0;
 }

 static int tps65217_enable_charging(struct tps65217_charger *charger)
 {
 	int ret;

 	/* charger already enabled */
 	if (charger->ac_online)
 		return 0;

 	dev_dbg(charger->dev, "%s: enable charging\n", __func__);
 	ret = tps65217_set_bits(charger->tps, TPS65217_REG_CHGCONFIG1,
 				TPS65217_CHGCONFIG1_CHG_EN,
 				TPS65217_CHGCONFIG1_CHG_EN,
 				TPS65217_PROTECT_NONE);
 	if (ret) {
 		dev_err(charger->dev,
 			"%s: Error in writing CHG_EN in reg 0x%x: %d\n",
 			__func__, TPS65217_REG_CHGCONFIG1, ret);
 		return ret;
 	}

 	charger->ac_online = 1;

 	return 0;
 }

 static int tps65217_ac_get_property(struct power_supply *psy,
 			enum power_supply_property psp,
 			union power_supply_propval *val)
 {
 	struct tps65217_charger *charger = power_supply_get_drvdata(psy);

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

 static irqreturn_t tps65217_charger_irq(int irq, void *dev)
 {
 	int ret, val;
 	struct tps65217_charger *charger = dev;

 	charger->prev_ac_online = charger->ac_online;

 	ret = tps65217_reg_read(charger->tps, TPS65217_REG_STATUS, &val);
 	if (ret < 0) {
 		dev_err(charger->dev, "%s: Error in reading reg 0x%x\n",
 			__func__, TPS65217_REG_STATUS);
 		return IRQ_HANDLED;
 	}

 	dev_dbg(charger->dev, "%s: 0x%x\n", __func__, val);

 	/* check for AC status bit */
 	if (val & TPS65217_STATUS_ACPWR) {
 		ret = tps65217_enable_charging(charger);
 		if (ret) {
 			dev_err(charger->dev,
 				"failed to enable charger: %d\n", ret);
 			return IRQ_HANDLED;
 		}
 	} else {
 		charger->ac_online = 0;
 	}

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

 	ret = tps65217_reg_read(charger->tps, TPS65217_REG_CHGCONFIG0, &val);
 	if (ret < 0) {
 		dev_err(charger->dev, "%s: Error in reading reg 0x%x\n",
 			__func__, TPS65217_REG_CHGCONFIG0);
 		return IRQ_HANDLED;
 	}

 	if (val & TPS65217_CHGCONFIG0_ACTIVE)
 		dev_dbg(charger->dev, "%s: charger is charging\n", __func__);
 	else
 		dev_dbg(charger->dev,
 			"%s: charger is NOT charging\n", __func__);

 	return IRQ_HANDLED;
 }

 static int tps65217_charger_poll_task(void *data)
 {
 	set_freezable();

 	while (!kthread_should_stop()) {
 		schedule_timeout_interruptible(POLL_INTERVAL);
 		try_to_freeze();
 		tps65217_charger_irq(-1, data);
 	}
 	return 0;
 }

 static const struct power_supply_desc tps65217_charger_desc = {
 	.name			= "tps65217-ac",
 	.type			= POWER_SUPPLY_TYPE_MAINS,
 	.get_property		= tps65217_ac_get_property,
 	.properties		= tps65217_ac_props,
 	.num_properties		= ARRAY_SIZE(tps65217_ac_props),
 };

 static int tps65217_charger_probe(struct platform_device *pdev)
 {
 	struct tps65217 *tps = dev_get_drvdata(pdev->dev.parent);
 	struct tps65217_charger *charger;
 	int ret;

 	dev_dbg(&pdev->dev, "%s\n", __func__);

 	charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
 	if (!charger)
 		return -ENOMEM;

 	platform_set_drvdata(pdev, charger);
 	charger->tps = tps;
 	charger->dev = &pdev->dev;

 	charger->ac = devm_power_supply_register(&pdev->dev,
 						 &tps65217_charger_desc,
 						 NULL);
 	if (IS_ERR(charger->ac)) {
 		dev_err(&pdev->dev, "failed: power supply register\n");
 		return PTR_ERR(charger->ac);
 	}

 	ret = tps65217_config_charger(charger);
 	if (ret < 0) {
 		dev_err(charger->dev, "charger config failed, err %d\n", ret);
 		return ret;
 	}

 	charger->poll_task = kthread_run(tps65217_charger_poll_task,
 				      charger, "ktps65217charger");
 	if (IS_ERR(charger->poll_task)) {
 		ret = PTR_ERR(charger->poll_task);
 		dev_err(charger->dev, "Unable to run kthread err %d\n", ret);
 		return ret;
 	}

 	return 0;
 }

 static int tps65217_charger_remove(struct platform_device *pdev)
 {
 	struct tps65217_charger *charger = platform_get_drvdata(pdev);

 	kthread_stop(charger->poll_task);

 	return 0;
 }

 static const struct of_device_id tps65217_charger_match_table[] = {
 	{ .compatible = "ti,tps65217-charger", },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, tps65217_charger_match_table);

 static struct platform_driver tps65217_charger_driver = {
 	.probe	= tps65217_charger_probe,
 	.remove = tps65217_charger_remove,
 	.driver	= {
 		.name	= "tps65217-charger",
 		.of_match_table = of_match_ptr(tps65217_charger_match_table),
 	},

 };
 module_platform_driver(tps65217_charger_driver);

 MODULE_LICENSE("GPL v2");
 MODULE_AUTHOR("Enric Balletbo Serra <enric.balletbo@collabora.com>");
 MODULE_DESCRIPTION("TPS65217 battery charger driver");
	/*
	* Battery charger driver for TI's tps65217
	*
	* Copyright (c) 2015, Collabora Ltd.

	* 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/>.
	*/

	/*
	* Battery charger driver for TI's tps65217
	*/
	#include <linux/kernel.h>
	#include <linux/kthread.h>
	#include <linux/device.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/init.h>
	#include <linux/interrupt.h>
	#include <linux/slab.h>
	#include <linux/err.h>
	#include <linux/of.h>
	#include <linux/of_device.h>
	#include <linux/power_supply.h>

	#include <linux/mfd/core.h>
	#include <linux/mfd/tps65217.h>

	#define POLL_INTERVAL (HZ * 2)

	struct tps65217_charger {
	struct tps65217 *tps;
	struct device *dev;
	struct power_supply *ac;

	int ac_online;
	int prev_ac_online;

	struct task_struct *poll_task;
	};

	static enum power_supply_property tps65217_ac_props[] = {
	POWER_SUPPLY_PROP_ONLINE,
	};

	static int tps65217_config_charger(struct tps65217_charger *charger)
	{
	int ret;

	dev_dbg(charger->dev, "%s\n", __func__);

	/*
	* tps65217 rev. G, p. 31 (see p. 32 for NTC schematic)
	*
	* The device can be configured to support a 100k NTC (B = 3960) by
	* setting the the NTC_TYPE bit in register CHGCONFIG1 to 1. However it
	* is not recommended to do so. In sleep mode, the charger continues
	* charging the battery, but all register values are reset to default
	* values. Therefore, the charger would get the wrong temperature
	* information. If 100k NTC setting is required, please contact the
	* factory.
	*
	* ATTENTION, conflicting information, from p. 46
	*
	* NTC TYPE (for battery temperature measurement)
	* 0 – 100k (curve 1, B = 3960)
	* 1 – 10k (curve 2, B = 3480) (default on reset)
	*
	*/
	ret = tps65217_clear_bits(charger->tps, TPS65217_REG_CHGCONFIG1,
	TPS65217_CHGCONFIG1_NTC_TYPE,
	TPS65217_PROTECT_NONE);
	if (ret) {
	dev_err(charger->dev,
	"failed to set 100k NTC setting: %d\n", ret);
	return ret;
	}

	return 0;
	}

	static int tps65217_enable_charging(struct tps65217_charger *charger)
	{
	int ret;

	/* charger already enabled */
	if (charger->ac_online)
	return 0;

	dev_dbg(charger->dev, "%s: enable charging\n", __func__);
	ret = tps65217_set_bits(charger->tps, TPS65217_REG_CHGCONFIG1,
	TPS65217_CHGCONFIG1_CHG_EN,
	TPS65217_CHGCONFIG1_CHG_EN,
	TPS65217_PROTECT_NONE);
	if (ret) {
	dev_err(charger->dev,
	"%s: Error in writing CHG_EN in reg 0x%x: %d\n",
	__func__, TPS65217_REG_CHGCONFIG1, ret);
	return ret;
	}

	charger->ac_online = 1;

	return 0;
	}

	static int tps65217_ac_get_property(struct power_supply *psy,
	enum power_supply_property psp,
	union power_supply_propval *val)
	{
	struct tps65217_charger *charger = power_supply_get_drvdata(psy);

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

	static irqreturn_t tps65217_charger_irq(int irq, void *dev)
	{
	int ret, val;
	struct tps65217_charger *charger = dev;

	charger->prev_ac_online = charger->ac_online;

	ret = tps65217_reg_read(charger->tps, TPS65217_REG_STATUS, &val);
	if (ret < 0) {
	dev_err(charger->dev, "%s: Error in reading reg 0x%x\n",
	__func__, TPS65217_REG_STATUS);
	return IRQ_HANDLED;
	}

	dev_dbg(charger->dev, "%s: 0x%x\n", __func__, val);

	/* check for AC status bit */
	if (val & TPS65217_STATUS_ACPWR) {
	ret = tps65217_enable_charging(charger);
	if (ret) {
	dev_err(charger->dev,
	"failed to enable charger: %d\n", ret);
	return IRQ_HANDLED;
	}
	} else {
	charger->ac_online = 0;
	}

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

	ret = tps65217_reg_read(charger->tps, TPS65217_REG_CHGCONFIG0, &val);
	if (ret < 0) {
	dev_err(charger->dev, "%s: Error in reading reg 0x%x\n",
	__func__, TPS65217_REG_CHGCONFIG0);
	return IRQ_HANDLED;
	}

	if (val & TPS65217_CHGCONFIG0_ACTIVE)
	dev_dbg(charger->dev, "%s: charger is charging\n", __func__);
	else
	dev_dbg(charger->dev,
	"%s: charger is NOT charging\n", __func__);

	return IRQ_HANDLED;
	}

	static int tps65217_charger_poll_task(void *data)
	{
	set_freezable();

	while (!kthread_should_stop()) {
	schedule_timeout_interruptible(POLL_INTERVAL);
	try_to_freeze();
	tps65217_charger_irq(-1, data);
	}
	return 0;
	}

	static const struct power_supply_desc tps65217_charger_desc = {
	.name = "tps65217-ac",
	.type = POWER_SUPPLY_TYPE_MAINS,
	.get_property = tps65217_ac_get_property,
	.properties = tps65217_ac_props,
	.num_properties = ARRAY_SIZE(tps65217_ac_props),
	};

	static int tps65217_charger_probe(struct platform_device *pdev)
	{
	struct tps65217 *tps = dev_get_drvdata(pdev->dev.parent);
	struct tps65217_charger *charger;
	int ret;

	dev_dbg(&pdev->dev, "%s\n", __func__);

	charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
	if (!charger)
	return -ENOMEM;

	platform_set_drvdata(pdev, charger);
	charger->tps = tps;
	charger->dev = &pdev->dev;

	charger->ac = devm_power_supply_register(&pdev->dev,
	&tps65217_charger_desc,
	NULL);
	if (IS_ERR(charger->ac)) {
	dev_err(&pdev->dev, "failed: power supply register\n");
	return PTR_ERR(charger->ac);
	}

	ret = tps65217_config_charger(charger);
	if (ret < 0) {
	dev_err(charger->dev, "charger config failed, err %d\n", ret);
	return ret;
	}

	charger->poll_task = kthread_run(tps65217_charger_poll_task,
	charger, "ktps65217charger");
	if (IS_ERR(charger->poll_task)) {
	ret = PTR_ERR(charger->poll_task);
	dev_err(charger->dev, "Unable to run kthread err %d\n", ret);
	return ret;
	}

	return 0;
	}

	static int tps65217_charger_remove(struct platform_device *pdev)
	{
	struct tps65217_charger *charger = platform_get_drvdata(pdev);

	kthread_stop(charger->poll_task);

	return 0;
	}

	static const struct of_device_id tps65217_charger_match_table[] = {
	{ .compatible = "ti,tps65217-charger", },
	{ /* sentinel */ }
	};
	MODULE_DEVICE_TABLE(of, tps65217_charger_match_table);

	static struct platform_driver tps65217_charger_driver = {
	.probe = tps65217_charger_probe,
	.remove = tps65217_charger_remove,
	.driver = {
	.name = "tps65217-charger",
	.of_match_table = of_match_ptr(tps65217_charger_match_table),
	},

	};
	module_platform_driver(tps65217_charger_driver);

	MODULE_LICENSE("GPL v2");
	MODULE_AUTHOR("Enric Balletbo Serra <enric.balletbo@collabora.com>");
	MODULE_DESCRIPTION("TPS65217 battery charger driver");