[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / power / gpio-charger.c

/*
 *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
 *  Driver for chargers which report their online status through a GPIO pin
 *
 *  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.
 *
 *  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.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#include <linux/device.h>
#include <linux/gpio.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/slab.h>

#include <linux/power/gpio-charger.h>

struct gpio_charger {
	const struct gpio_charger_platform_data *pdata;
	unsigned int irq;

	struct power_supply charger;
};

static irqreturn_t gpio_charger_irq(int irq, void *devid)
{
	struct power_supply *charger = devid;

	power_supply_changed(charger);

	return IRQ_HANDLED;
}

static inline struct gpio_charger *psy_to_gpio_charger(struct power_supply *psy)
{
	return container_of(psy, struct gpio_charger, charger);
}

static int gpio_charger_get_property(struct power_supply *psy,
		enum power_supply_property psp, union power_supply_propval *val)
{
	struct gpio_charger *gpio_charger = psy_to_gpio_charger(psy);
	const struct gpio_charger_platform_data *pdata = gpio_charger->pdata;

	switch (psp) {
	case POWER_SUPPLY_PROP_ONLINE:
		val->intval = gpio_get_value_cansleep(pdata->gpio);
		val->intval ^= pdata->gpio_active_low;
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

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

static int gpio_charger_probe(struct platform_device *pdev)
{
	const struct gpio_charger_platform_data *pdata = pdev->dev.platform_data;
	struct gpio_charger *gpio_charger;
	struct power_supply *charger;
	int ret;
	int irq;

	if (!pdata) {
		dev_err(&pdev->dev, "No platform data\n");
		return -EINVAL;
	}

	if (!gpio_is_valid(pdata->gpio)) {
		dev_err(&pdev->dev, "Invalid gpio pin\n");
		return -EINVAL;
	}

	gpio_charger = devm_kzalloc(&pdev->dev, sizeof(*gpio_charger),
					GFP_KERNEL);
	if (!gpio_charger) {
		dev_err(&pdev->dev, "Failed to alloc driver structure\n");
		return -ENOMEM;
	}

	charger = &gpio_charger->charger;

	charger->name = pdata->name ? pdata->name : "gpio-charger";
	charger->type = pdata->type;
	charger->properties = gpio_charger_properties;
	charger->num_properties = ARRAY_SIZE(gpio_charger_properties);
	charger->get_property = gpio_charger_get_property;
	charger->supplied_to = pdata->supplied_to;
	charger->num_supplicants = pdata->num_supplicants;

	ret = gpio_request(pdata->gpio, dev_name(&pdev->dev));
	if (ret) {
		dev_err(&pdev->dev, "Failed to request gpio pin: %d\n", ret);
		goto err_free;
	}
	ret = gpio_direction_input(pdata->gpio);
	if (ret) {
		dev_err(&pdev->dev, "Failed to set gpio to input: %d\n", ret);
		goto err_gpio_free;
	}

	gpio_charger->pdata = pdata;

	ret = power_supply_register(&pdev->dev, charger);
	if (ret < 0) {
		dev_err(&pdev->dev, "Failed to register power supply: %d\n",
			ret);
		goto err_gpio_free;
	}

	irq = gpio_to_irq(pdata->gpio);
	if (irq > 0) {
		ret = request_any_context_irq(irq, gpio_charger_irq,
				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
				dev_name(&pdev->dev), charger);
		if (ret < 0)
			dev_warn(&pdev->dev, "Failed to request irq: %d\n", ret);
		else
			gpio_charger->irq = irq;
	}

	platform_set_drvdata(pdev, gpio_charger);

	return 0;

err_gpio_free:
	gpio_free(pdata->gpio);
err_free:
	return ret;
}

static int gpio_charger_remove(struct platform_device *pdev)
{
	struct gpio_charger *gpio_charger = platform_get_drvdata(pdev);

	if (gpio_charger->irq)
		free_irq(gpio_charger->irq, &gpio_charger->charger);

	power_supply_unregister(&gpio_charger->charger);

	gpio_free(gpio_charger->pdata->gpio);

	platform_set_drvdata(pdev, NULL);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int gpio_charger_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct gpio_charger *gpio_charger = platform_get_drvdata(pdev);

	power_supply_changed(&gpio_charger->charger);

	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(gpio_charger_pm_ops, NULL, gpio_charger_resume);

static struct platform_driver gpio_charger_driver = {
	.probe = gpio_charger_probe,
	.remove = gpio_charger_remove,
	.driver = {
		.name = "gpio-charger",
		.owner = THIS_MODULE,
		.pm = &gpio_charger_pm_ops,
	},
};

module_platform_driver(gpio_charger_driver);

MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
MODULE_DESCRIPTION("Driver for chargers which report their online status through a GPIO");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:gpio-charger");
Commit	Line	Data
5070437c LPC	1	/*
	2	* Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
	3	* Driver for chargers which report their online status through a GPIO pin
	4	*
	5	* This program is free software; you can redistribute it and/or modify it
	6	* under the terms of the GNU General Public License as published by the
	7	* Free Software Foundation; either version 2 of the License, or (at your
	8	* option) any later version.
	9	*
	10	* You should have received a copy of the GNU General Public License along
	11	* with this program; if not, write to the Free Software Foundation, Inc.,
	12	* 675 Mass Ave, Cambridge, MA 02139, USA.
	13	*
	14	*/
	15
	16	#include <linux/device.h>
	17	#include <linux/gpio.h>
	18	#include <linux/init.h>
	19	#include <linux/interrupt.h>
	20	#include <linux/kernel.h>
	21	#include <linux/module.h>
	22	#include <linux/platform_device.h>
	23	#include <linux/power_supply.h>
	24	#include <linux/slab.h>
	25
	26	#include <linux/power/gpio-charger.h>
	27
	28	struct gpio_charger {
	29	const struct gpio_charger_platform_data *pdata;
	30	unsigned int irq;
	31
	32	struct power_supply charger;
	33	};
	34
	35	static irqreturn_t gpio_charger_irq(int irq, void *devid)
	36	{
	37	struct power_supply *charger = devid;
	38
	39	power_supply_changed(charger);
	40
	41	return IRQ_HANDLED;
	42	}
	43
	44	static inline struct gpio_charger psy_to_gpio_charger(struct power_supply psy)
	45	{
	46	return container_of(psy, struct gpio_charger, charger);
	47	}
	48
	49	static int gpio_charger_get_property(struct power_supply *psy,
	50	enum power_supply_property psp, union power_supply_propval *val)
	51	{
	52	struct gpio_charger *gpio_charger = psy_to_gpio_charger(psy);
	53	const struct gpio_charger_platform_data *pdata = gpio_charger->pdata;
	54
	55	switch (psp) {
	56	case POWER_SUPPLY_PROP_ONLINE:
ecb7a8eb	57	val->intval = gpio_get_value_cansleep(pdata->gpio);
5070437c LPC	58	val->intval ^= pdata->gpio_active_low;
	59	break;
	60	default:
	61	return -EINVAL;
	62	}
	63
	64	return 0;
	65	}
	66
	67	static enum power_supply_property gpio_charger_properties[] = {
	68	POWER_SUPPLY_PROP_ONLINE,
	69	};
	70
c8afa640	71	static int gpio_charger_probe(struct platform_device *pdev)
5070437c LPC	72	{
	73	const struct gpio_charger_platform_data *pdata = pdev->dev.platform_data;
	74	struct gpio_charger *gpio_charger;
	75	struct power_supply *charger;
	76	int ret;
	77	int irq;
	78
	79	if (!pdata) {
	80	dev_err(&pdev->dev, "No platform data\n");
	81	return -EINVAL;
	82	}
	83
	84	if (!gpio_is_valid(pdata->gpio)) {
	85	dev_err(&pdev->dev, "Invalid gpio pin\n");
	86	return -EINVAL;
	87	}
	88
b92ff855 JH	89	gpio_charger = devm_kzalloc(&pdev->dev, sizeof(*gpio_charger),
b92ff855 JH	90	GFP_KERNEL);
2e9ff5f5 LPC	91	if (!gpio_charger) {
	92	dev_err(&pdev->dev, "Failed to alloc driver structure\n");
	93	return -ENOMEM;
	94	}
5070437c LPC	95
	96	charger = &gpio_charger->charger;
	97
80577b8a	98	charger->name = pdata->name ? pdata->name : "gpio-charger";
5070437c LPC	99	charger->type = pdata->type;
	100	charger->properties = gpio_charger_properties;
	101	charger->num_properties = ARRAY_SIZE(gpio_charger_properties);
26eb3872	102	charger->get_property = gpio_charger_get_property;
5070437c LPC	103	charger->supplied_to = pdata->supplied_to;
	104	charger->num_supplicants = pdata->num_supplicants;
	105
	106	ret = gpio_request(pdata->gpio, dev_name(&pdev->dev));
	107	if (ret) {
	108	dev_err(&pdev->dev, "Failed to request gpio pin: %d\n", ret);
	109	goto err_free;
	110	}
	111	ret = gpio_direction_input(pdata->gpio);
	112	if (ret) {
	113	dev_err(&pdev->dev, "Failed to set gpio to input: %d\n", ret);
	114	goto err_gpio_free;
	115	}
	116
26eb3872 LPC	117	gpio_charger->pdata = pdata;
	118
	119	ret = power_supply_register(&pdev->dev, charger);
	120	if (ret < 0) {
	121	dev_err(&pdev->dev, "Failed to register power supply: %d\n",
	122	ret);
	123	goto err_gpio_free;
	124	}
	125
5070437c LPC	126	irq = gpio_to_irq(pdata->gpio);
5070437c LPC	127	if (irq > 0) {
26eb3872	128	ret = request_any_context_irq(irq, gpio_charger_irq,
5070437c LPC	129	IRQF_TRIGGER_RISING \| IRQF_TRIGGER_FALLING,
5070437c LPC	130	dev_name(&pdev->dev), charger);
f8c63918	131	if (ret < 0)
5070437c LPC	132	dev_warn(&pdev->dev, "Failed to request irq: %d\n", ret);
	133	else
	134	gpio_charger->irq = irq;
	135	}
	136
5070437c LPC	137	platform_set_drvdata(pdev, gpio_charger);
	138
	139	return 0;
	140
5070437c LPC	141	err_gpio_free:
	142	gpio_free(pdata->gpio);
	143	err_free:
5070437c LPC	144	return ret;
	145	}
	146
415ec69f	147	static int gpio_charger_remove(struct platform_device *pdev)
5070437c LPC	148	{
	149	struct gpio_charger *gpio_charger = platform_get_drvdata(pdev);
	150
5070437c LPC	151	if (gpio_charger->irq)
5070437c LPC	152	free_irq(gpio_charger->irq, &gpio_charger->charger);
26eb3872 LPC	153
	154	power_supply_unregister(&gpio_charger->charger);
	155
5070437c LPC	156	gpio_free(gpio_charger->pdata->gpio);
	157
	158	platform_set_drvdata(pdev, NULL);
5070437c LPC	159
	160	return 0;
	161	}
	162
f10513de BL	163	#ifdef CONFIG_PM_SLEEP
	164	static int gpio_charger_resume(struct device *dev)
	165	{
	166	struct platform_device *pdev = to_platform_device(dev);
	167	struct gpio_charger *gpio_charger = platform_get_drvdata(pdev);
	168
	169	power_supply_changed(&gpio_charger->charger);
	170
	171	return 0;
	172	}
	173	#endif
	174
	175	static SIMPLE_DEV_PM_OPS(gpio_charger_pm_ops, NULL, gpio_charger_resume);
	176
5070437c LPC	177	static struct platform_driver gpio_charger_driver = {
5070437c LPC	178	.probe = gpio_charger_probe,
28ea73f4	179	.remove = gpio_charger_remove,
5070437c LPC	180	.driver = {
	181	.name = "gpio-charger",
	182	.owner = THIS_MODULE,
f10513de	183	.pm = &gpio_charger_pm_ops,
5070437c LPC	184	},
	185	};
	186
300bac7f	187	module_platform_driver(gpio_charger_driver);
5070437c LPC	188
	189	MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
	190	MODULE_DESCRIPTION("Driver for chargers which report their online status through a GPIO");
	191	MODULE_LICENSE("GPL");
	192	MODULE_ALIAS("platform:gpio-charger");