drivers/power/bq51013b_charger.c - kernel/msm.git - Git at Google

 /*
 * Copyright(c) 2013, LGE Inc. All rights reserved.
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * 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.
 *
 */

 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/gpio.h>
 #include <linux/errno.h>
 #include <linux/interrupt.h>
 #include <linux/power_supply.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/of_gpio.h>
 #include <linux/power/bq51013b_charger.h>

 #define BQ51013B_NAME "bq51013b"

 struct bq51013b_chip {
 	struct device *dev;
 	struct power_supply wlc_psy;
 	struct power_supply *ac_psy;
 	unsigned int chg_ctrl_gpio;
 	unsigned int wlc_int_gpio;
 	int current_ma;
 	int present;
 	int online;
 };

 static const struct platform_device_id bq51013b_id[] = {
 	{BQ51013B_NAME, 0},
 	{},
 };

 static struct of_device_id bq51013b_match[] = {
 	{ .compatible = "ti,bq51013b", },
 	{}
 };

 static enum power_supply_property pm_power_props_wireless[] = {
 	POWER_SUPPLY_PROP_PRESENT,
 	POWER_SUPPLY_PROP_ONLINE,
 	POWER_SUPPLY_PROP_CURRENT_MAX,
 };

 static char *pm_power_supplied_to[] = {
 	"ac",
 #ifdef CONFIG_TOUCHSCREEN_CHARGER_NOTIFY
 	"touch",
 #endif
 };

 static int bq51013b_charger_is_present(struct bq51013b_chip *chip)
 {
 	return !gpio_get_value(chip->wlc_int_gpio);
 }

 static int pm_power_get_property_wireless(struct power_supply *psy,
 					  enum power_supply_property psp,
 					  union power_supply_propval *val)
 {
 	struct bq51013b_chip *chip = container_of(psy, struct bq51013b_chip,
 						wlc_psy);

 	switch (psp) {
 	case POWER_SUPPLY_PROP_PRESENT:
 		val->intval = bq51013b_charger_is_present(chip);
 		break;
 	case POWER_SUPPLY_PROP_ONLINE:
 		val->intval = chip->online;
 		break;
 	case POWER_SUPPLY_PROP_CURRENT_MAX:
 		val->intval = chip->current_ma * 1000;
 		break;
 	default:
 		return -EINVAL;
 	}
 	return 0;
 }

 static irqreturn_t bq51013b_irq_handler(int irq, void *data)
 {
 	struct bq51013b_chip *chip = data;
 	int present;

 	if (!chip->ac_psy)
 		chip->ac_psy = power_supply_get_by_name("ac");

 	if (!chip->ac_psy)
 		return IRQ_HANDLED;

 	present = bq51013b_charger_is_present(chip);

 	pr_debug("%s: wlc present = %d\n", __func__, present);
 	power_supply_set_present(chip->ac_psy, present);

 	return IRQ_HANDLED;
 }

 static int pm_power_set_property_wireless(struct power_supply *psy,
 				  enum power_supply_property psp,
 				  const union power_supply_propval *val)
 {
 	struct bq51013b_chip *chip = container_of(psy, struct bq51013b_chip,
 						wlc_psy);

 	switch (psp) {
 	case POWER_SUPPLY_PROP_ONLINE:
 		chip->online = val->intval;
 		break;
 	default:
 		return -EINVAL;
 	}

 	power_supply_changed(&chip->wlc_psy);
 	return 0;
 }

 static int bq51013b_gpio_init(struct bq51013b_chip *chip)
 {
 	int ret = 0;

 	ret =  gpio_request_one(chip->chg_ctrl_gpio, GPIOF_OUT_INIT_LOW,
 			"chg_ctrl_gpio");
 	if (ret) {
 		pr_err("%s: failed to request chg_ctrl_gpio\n", __func__);
 		goto err_chg_ctrl_gpio;
 	}

 	ret =  gpio_request_one(chip->wlc_int_gpio, GPIOF_DIR_IN,
 			"wlc_int_gpio");
 	if (ret) {
 		pr_err("%s: failed to request wlc_int_gpio\n", __func__);
 		goto err_wlc_int;
 	}

 err_wlc_int:
 	gpio_free(chip->chg_ctrl_gpio);
 err_chg_ctrl_gpio:
 	return ret;

 }

 static int bq51013b_init_wlc_psy(struct bq51013b_chip *chip)
 {
 	int ret = 0;

 	chip->wlc_psy.name = "wireless";
 	chip->wlc_psy.type = POWER_SUPPLY_TYPE_WIRELESS;
 	chip->wlc_psy.supplied_to = pm_power_supplied_to;
 	chip->wlc_psy.num_supplicants = ARRAY_SIZE(pm_power_supplied_to);
 	chip->wlc_psy.properties = pm_power_props_wireless;
 	chip->wlc_psy.num_properties = ARRAY_SIZE(pm_power_props_wireless);
 	chip->wlc_psy.get_property = pm_power_get_property_wireless;
 	chip->wlc_psy.set_property = pm_power_set_property_wireless;

 	ret = power_supply_register(chip->dev, &chip->wlc_psy);
 	if (ret) {
 		pr_err("%s: failed to register power_supply. ret = %d\n",
 				__func__, ret);
 		return ret;
 	}

 	return 0;
 }

 static int bq51013b_parse_dt(struct device_node *dev_node,
 				struct bq51013b_chip *chip)
 {
 	int ret = 0;

 	chip->chg_ctrl_gpio = of_get_named_gpio(dev_node,
 					"ti,chg-ctrl-gpio", 0);
 	if (chip->chg_ctrl_gpio < 0) {
 		pr_err("%s: failed to get chg_ctrl_gpio\n", __func__);
 		ret = chip->chg_ctrl_gpio;
 		goto out;
 	}

 	chip->wlc_int_gpio = of_get_named_gpio(dev_node,
 					"ti,wlc-int-gpio", 0);
 	if (chip->wlc_int_gpio < 0) {
 		pr_err("%s: failed to get wlc_int_gpio\n", __func__);
 		ret = chip->chg_ctrl_gpio;
 		goto out;
 	}

 	ret = of_property_read_u32(dev_node, "ti,chg-current-ma",
 				   &(chip->current_ma));
 	if (ret) {
 		pr_err("%s: failed to get current_ma\n", __func__);
 		goto out;
 	}

 	pr_info("%s: current_ma = %d\n", __func__, chip->current_ma);
 out:
 	return ret;
 }

 static int bq51013b_probe(struct platform_device *pdev)
 {
 	struct bq51013b_chip *chip;
 	struct device_node *dev_node = pdev->dev.of_node;
 	struct bq51013b_platform_data *pdata;
 	int ret = 0;

 	pr_info("%s: start\n", __func__);

 	chip = kzalloc(sizeof(struct bq51013b_chip), GFP_KERNEL);
 	if (!chip) {
 		pr_err("%s: failed to alloc memory\n", __func__);
 		return -ENOMEM;
 	}

 	if (dev_node) {
 		ret = bq51013b_parse_dt(dev_node, chip);
 		if (ret) {
 			pr_err("failed to parse dt\n");
 			goto err_parse_dt;
 		}
 	} else {
 		pdata = pdev->dev.platform_data;
 		chip->chg_ctrl_gpio = pdata->chg_ctrl_gpio;
 		chip->wlc_int_gpio = pdata->wlc_int_gpio;
 		chip->current_ma = pdata->current_ma;
 	}

 	chip->dev = &pdev->dev;

 	ret = bq51013b_init_wlc_psy(chip);
 	if (ret) {
 		pr_err("%s: failed to init power supply", __func__);
 		goto err_parse_dt;
 	}

 	ret = bq51013b_gpio_init(chip);
 	if (ret) {
 		pr_err("%s: gpio int failed", __func__);
 		goto err_gpio_init;
 	}

 	ret = request_threaded_irq(gpio_to_irq(chip->wlc_int_gpio), NULL,
 				bq51013b_irq_handler,
 				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
 				"bq51013b", chip);
 	if (ret) {
 		pr_err("%s: failed to request irq", __func__);
 		goto err_req_irq;
 	}
 	enable_irq_wake(gpio_to_irq(chip->wlc_int_gpio));
 	platform_set_drvdata(pdev, chip);

 	return 0;

 err_req_irq:
 	gpio_free(chip->chg_ctrl_gpio);
 	gpio_free(chip->wlc_int_gpio);
 err_gpio_init:
 	power_supply_unregister(&chip->wlc_psy);
 err_parse_dt:
 	kfree(chip);
 	return ret;
 }

 static int bq51013b_remove(struct platform_device *pdev)
 {
 	struct bq51013b_chip *chip = platform_get_drvdata(pdev);

 	platform_set_drvdata(pdev, NULL);
 	free_irq(gpio_to_irq(chip->wlc_int_gpio), chip);
 	gpio_free(chip->wlc_int_gpio);
 	gpio_free(chip->chg_ctrl_gpio);
 	power_supply_unregister(&chip->wlc_psy);
 	kfree(chip);
 	return 0;
 }

 static struct platform_driver bq51013b_driver = {
 	.probe = bq51013b_probe,
 	.remove = bq51013b_remove,
 	.id_table = bq51013b_id,
 	.driver = {
 		.name = BQ51013B_NAME,
 		.owner = THIS_MODULE,
 		.of_match_table = bq51013b_match,
 	},
 };

 static int __init bq51013b_init(void)
 {
 	return platform_driver_register(&bq51013b_driver);
 }
 module_init(bq51013b_init);

 static void __exit bq51013b_exit(void)
 {
 	platform_driver_unregister(&bq51013b_driver);
 }
 module_exit(bq51013b_exit);

 MODULE_AUTHOR("ChoongRyeol Lee <choongryeol.lee@lge.com>");
 MODULE_DESCRIPTION("BQ51013B Wireless Charger Driver");
 MODULE_LICENSE("GPL v2");
	/*
	* Copyright(c) 2013, LGE Inc. All rights reserved.
	*
	* This software is licensed under the terms of the GNU General Public
	* License version 2, as published by the Free Software Foundation, and
	* may be copied, distributed, and modified under those terms.
	*
	* 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.
	*
	*/

	#include <linux/module.h>
	#include <linux/moduleparam.h>
	#include <linux/platform_device.h>
	#include <linux/slab.h>
	#include <linux/gpio.h>
	#include <linux/errno.h>
	#include <linux/interrupt.h>
	#include <linux/power_supply.h>
	#include <linux/of.h>
	#include <linux/of_device.h>
	#include <linux/of_gpio.h>
	#include <linux/power/bq51013b_charger.h>

	#define BQ51013B_NAME "bq51013b"

	struct bq51013b_chip {
	struct device *dev;
	struct power_supply wlc_psy;
	struct power_supply *ac_psy;
	unsigned int chg_ctrl_gpio;
	unsigned int wlc_int_gpio;
	int current_ma;
	int present;
	int online;
	};

	static const struct platform_device_id bq51013b_id[] = {
	{BQ51013B_NAME, 0},
	{},
	};

	static struct of_device_id bq51013b_match[] = {
	{ .compatible = "ti,bq51013b", },
	{}
	};

	static enum power_supply_property pm_power_props_wireless[] = {
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_ONLINE,
	POWER_SUPPLY_PROP_CURRENT_MAX,
	};

	static char *pm_power_supplied_to[] = {
	"ac",
	#ifdef CONFIG_TOUCHSCREEN_CHARGER_NOTIFY
	"touch",
	#endif
	};

	static int bq51013b_charger_is_present(struct bq51013b_chip *chip)
	{
	return !gpio_get_value(chip->wlc_int_gpio);
	}

	static int pm_power_get_property_wireless(struct power_supply *psy,
	enum power_supply_property psp,
	union power_supply_propval *val)
	{
	struct bq51013b_chip *chip = container_of(psy, struct bq51013b_chip,
	wlc_psy);

	switch (psp) {
	case POWER_SUPPLY_PROP_PRESENT:
	val->intval = bq51013b_charger_is_present(chip);
	break;
	case POWER_SUPPLY_PROP_ONLINE:
	val->intval = chip->online;
	break;
	case POWER_SUPPLY_PROP_CURRENT_MAX:
	val->intval = chip->current_ma * 1000;
	break;
	default:
	return -EINVAL;
	}
	return 0;
	}

	static irqreturn_t bq51013b_irq_handler(int irq, void *data)
	{
	struct bq51013b_chip *chip = data;
	int present;

	if (!chip->ac_psy)
	chip->ac_psy = power_supply_get_by_name("ac");

	if (!chip->ac_psy)
	return IRQ_HANDLED;

	present = bq51013b_charger_is_present(chip);

	pr_debug("%s: wlc present = %d\n", __func__, present);
	power_supply_set_present(chip->ac_psy, present);

	return IRQ_HANDLED;
	}

	static int pm_power_set_property_wireless(struct power_supply *psy,
	enum power_supply_property psp,
	const union power_supply_propval *val)
	{
	struct bq51013b_chip *chip = container_of(psy, struct bq51013b_chip,
	wlc_psy);

	switch (psp) {
	case POWER_SUPPLY_PROP_ONLINE:
	chip->online = val->intval;
	break;
	default:
	return -EINVAL;
	}

	power_supply_changed(&chip->wlc_psy);
	return 0;
	}

	static int bq51013b_gpio_init(struct bq51013b_chip *chip)
	{
	int ret = 0;

	ret = gpio_request_one(chip->chg_ctrl_gpio, GPIOF_OUT_INIT_LOW,
	"chg_ctrl_gpio");
	if (ret) {
	pr_err("%s: failed to request chg_ctrl_gpio\n", __func__);
	goto err_chg_ctrl_gpio;
	}

	ret = gpio_request_one(chip->wlc_int_gpio, GPIOF_DIR_IN,
	"wlc_int_gpio");
	if (ret) {
	pr_err("%s: failed to request wlc_int_gpio\n", __func__);
	goto err_wlc_int;
	}

	err_wlc_int:
	gpio_free(chip->chg_ctrl_gpio);
	err_chg_ctrl_gpio:
	return ret;

	}

	static int bq51013b_init_wlc_psy(struct bq51013b_chip *chip)
	{
	int ret = 0;

	chip->wlc_psy.name = "wireless";
	chip->wlc_psy.type = POWER_SUPPLY_TYPE_WIRELESS;
	chip->wlc_psy.supplied_to = pm_power_supplied_to;
	chip->wlc_psy.num_supplicants = ARRAY_SIZE(pm_power_supplied_to);
	chip->wlc_psy.properties = pm_power_props_wireless;
	chip->wlc_psy.num_properties = ARRAY_SIZE(pm_power_props_wireless);
	chip->wlc_psy.get_property = pm_power_get_property_wireless;
	chip->wlc_psy.set_property = pm_power_set_property_wireless;

	ret = power_supply_register(chip->dev, &chip->wlc_psy);
	if (ret) {
	pr_err("%s: failed to register power_supply. ret = %d\n",
	__func__, ret);
	return ret;
	}

	return 0;
	}

	static int bq51013b_parse_dt(struct device_node *dev_node,
	struct bq51013b_chip *chip)
	{
	int ret = 0;

	chip->chg_ctrl_gpio = of_get_named_gpio(dev_node,
	"ti,chg-ctrl-gpio", 0);
	if (chip->chg_ctrl_gpio < 0) {
	pr_err("%s: failed to get chg_ctrl_gpio\n", __func__);
	ret = chip->chg_ctrl_gpio;
	goto out;
	}

	chip->wlc_int_gpio = of_get_named_gpio(dev_node,
	"ti,wlc-int-gpio", 0);
	if (chip->wlc_int_gpio < 0) {
	pr_err("%s: failed to get wlc_int_gpio\n", __func__);
	ret = chip->chg_ctrl_gpio;
	goto out;
	}

	ret = of_property_read_u32(dev_node, "ti,chg-current-ma",
	&(chip->current_ma));
	if (ret) {
	pr_err("%s: failed to get current_ma\n", __func__);
	goto out;
	}

	pr_info("%s: current_ma = %d\n", __func__, chip->current_ma);
	out:
	return ret;
	}

	static int bq51013b_probe(struct platform_device *pdev)
	{
	struct bq51013b_chip *chip;
	struct device_node *dev_node = pdev->dev.of_node;
	struct bq51013b_platform_data *pdata;
	int ret = 0;

	pr_info("%s: start\n", __func__);

	chip = kzalloc(sizeof(struct bq51013b_chip), GFP_KERNEL);
	if (!chip) {
	pr_err("%s: failed to alloc memory\n", __func__);
	return -ENOMEM;
	}

	if (dev_node) {
	ret = bq51013b_parse_dt(dev_node, chip);
	if (ret) {
	pr_err("failed to parse dt\n");
	goto err_parse_dt;
	}
	} else {
	pdata = pdev->dev.platform_data;
	chip->chg_ctrl_gpio = pdata->chg_ctrl_gpio;
	chip->wlc_int_gpio = pdata->wlc_int_gpio;
	chip->current_ma = pdata->current_ma;
	}

	chip->dev = &pdev->dev;

	ret = bq51013b_init_wlc_psy(chip);
	if (ret) {
	pr_err("%s: failed to init power supply", __func__);
	goto err_parse_dt;
	}

	ret = bq51013b_gpio_init(chip);
	if (ret) {
	pr_err("%s: gpio int failed", __func__);
	goto err_gpio_init;
	}

	ret = request_threaded_irq(gpio_to_irq(chip->wlc_int_gpio), NULL,
	bq51013b_irq_handler,
	IRQF_TRIGGER_RISING \| IRQF_TRIGGER_FALLING,
	"bq51013b", chip);
	if (ret) {
	pr_err("%s: failed to request irq", __func__);
	goto err_req_irq;
	}
	enable_irq_wake(gpio_to_irq(chip->wlc_int_gpio));
	platform_set_drvdata(pdev, chip);

	return 0;

	err_req_irq:
	gpio_free(chip->chg_ctrl_gpio);
	gpio_free(chip->wlc_int_gpio);
	err_gpio_init:
	power_supply_unregister(&chip->wlc_psy);
	err_parse_dt:
	kfree(chip);
	return ret;
	}

	static int bq51013b_remove(struct platform_device *pdev)
	{
	struct bq51013b_chip *chip = platform_get_drvdata(pdev);

	platform_set_drvdata(pdev, NULL);
	free_irq(gpio_to_irq(chip->wlc_int_gpio), chip);
	gpio_free(chip->wlc_int_gpio);
	gpio_free(chip->chg_ctrl_gpio);
	power_supply_unregister(&chip->wlc_psy);
	kfree(chip);
	return 0;
	}

	static struct platform_driver bq51013b_driver = {
	.probe = bq51013b_probe,
	.remove = bq51013b_remove,
	.id_table = bq51013b_id,
	.driver = {
	.name = BQ51013B_NAME,
	.owner = THIS_MODULE,
	.of_match_table = bq51013b_match,
	},
	};

	static int __init bq51013b_init(void)
	{
	return platform_driver_register(&bq51013b_driver);
	}
	module_init(bq51013b_init);

	static void __exit bq51013b_exit(void)
	{
	platform_driver_unregister(&bq51013b_driver);
	}
	module_exit(bq51013b_exit);

	MODULE_AUTHOR("ChoongRyeol Lee <choongryeol.lee@lge.com>");
	MODULE_DESCRIPTION("BQ51013B Wireless Charger Driver");
	MODULE_LICENSE("GPL v2");