[linux-2.6-block.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/of.h>
#include <linux/of_gpio.h>

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

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

	struct power_supply *charger;
	struct power_supply_desc charger_desc;
};

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 power_supply_get_drvdata(psy);
}

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
struct gpio_charger_platform_data *gpio_charger_parse_dt(struct device *dev)
{
	struct device_node *np = dev->of_node;
	struct gpio_charger_platform_data *pdata;
	const char *chargetype;
	enum of_gpio_flags flags;
	int ret;

	if (!np)
		return ERR_PTR(-ENOENT);

	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
		return ERR_PTR(-ENOMEM);

	pdata->name = np->name;

	pdata->gpio = of_get_gpio_flags(np, 0, &flags);
	if (pdata->gpio < 0) {
		if (pdata->gpio != -EPROBE_DEFER)
			dev_err(dev, "could not get charger gpio\n");
		return ERR_PTR(pdata->gpio);
	}

	pdata->gpio_active_low = !!(flags & OF_GPIO_ACTIVE_LOW);

	pdata->type = POWER_SUPPLY_TYPE_UNKNOWN;
	ret = of_property_read_string(np, "charger-type", &chargetype);
	if (ret >= 0) {
		if (!strncmp("unknown", chargetype, 7))
			pdata->type = POWER_SUPPLY_TYPE_UNKNOWN;
		else if (!strncmp("battery", chargetype, 7))
			pdata->type = POWER_SUPPLY_TYPE_BATTERY;
		else if (!strncmp("ups", chargetype, 3))
			pdata->type = POWER_SUPPLY_TYPE_UPS;
		else if (!strncmp("mains", chargetype, 5))
			pdata->type = POWER_SUPPLY_TYPE_MAINS;
		else if (!strncmp("usb-sdp", chargetype, 7))
			pdata->type = POWER_SUPPLY_TYPE_USB;
		else if (!strncmp("usb-dcp", chargetype, 7))
			pdata->type = POWER_SUPPLY_TYPE_USB_DCP;
		else if (!strncmp("usb-cdp", chargetype, 7))
			pdata->type = POWER_SUPPLY_TYPE_USB_CDP;
		else if (!strncmp("usb-aca", chargetype, 7))
			pdata->type = POWER_SUPPLY_TYPE_USB_ACA;
		else
			dev_warn(dev, "unknown charger type %s\n", chargetype);
	}

	return pdata;
}

static int gpio_charger_probe(struct platform_device *pdev)
{
	const struct gpio_charger_platform_data *pdata = pdev->dev.platform_data;
	struct power_supply_config psy_cfg = {};
	struct gpio_charger *gpio_charger;
	struct power_supply_desc *charger_desc;
	int ret;
	int irq;

	if (!pdata) {
		pdata = gpio_charger_parse_dt(&pdev->dev);
		if (IS_ERR(pdata)) {
			ret = PTR_ERR(pdata);
			if (ret != -EPROBE_DEFER)
				dev_err(&pdev->dev, "No platform data\n");
			return ret;
		}
	}

	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_desc = &gpio_charger->charger_desc;

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

	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 = gpio_charger;

	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;

	gpio_charger->charger = power_supply_register(&pdev->dev,
						      charger_desc, &psy_cfg);
	if (IS_ERR(gpio_charger->charger)) {
		ret = PTR_ERR(gpio_charger->charger);
		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), gpio_charger->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);

	device_init_wakeup(&pdev->dev, 1);

	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);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int gpio_charger_suspend(struct device *dev)
{
	struct gpio_charger *gpio_charger = dev_get_drvdata(dev);

	if (device_may_wakeup(dev))
		gpio_charger->wakeup_enabled =
			!enable_irq_wake(gpio_charger->irq);

	return 0;
}

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);

	if (device_may_wakeup(dev) && gpio_charger->wakeup_enabled)
		disable_irq_wake(gpio_charger->irq);
	power_supply_changed(gpio_charger->charger);

	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(gpio_charger_pm_ops,
		gpio_charger_suspend, gpio_charger_resume);

static const struct of_device_id gpio_charger_match[] = {
	{ .compatible = "gpio-charger" },
	{ }
};
MODULE_DEVICE_TABLE(of, gpio_charger_match);

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

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>
c8dd9cce HS	25	#include <linux/of.h>
c8dd9cce HS	26	#include <linux/of_gpio.h>
5070437c LPC	27
	28	#include <linux/power/gpio-charger.h>
	29
	30	struct gpio_charger {
	31	const struct gpio_charger_platform_data *pdata;
	32	unsigned int irq;
4ea81266	33	bool wakeup_enabled;
5070437c	34
297d716f KK	35	struct power_supply *charger;
297d716f KK	36	struct power_supply_desc charger_desc;
5070437c LPC	37	};
	38
	39	static irqreturn_t gpio_charger_irq(int irq, void *devid)
	40	{
	41	struct power_supply *charger = devid;
	42
	43	power_supply_changed(charger);
	44
	45	return IRQ_HANDLED;
	46	}
	47
	48	static inline struct gpio_charger psy_to_gpio_charger(struct power_supply psy)
	49	{
297d716f	50	return power_supply_get_drvdata(psy);
5070437c LPC	51	}
	52
	53	static int gpio_charger_get_property(struct power_supply *psy,
	54	enum power_supply_property psp, union power_supply_propval *val)
	55	{
	56	struct gpio_charger *gpio_charger = psy_to_gpio_charger(psy);
	57	const struct gpio_charger_platform_data *pdata = gpio_charger->pdata;
	58
	59	switch (psp) {
	60	case POWER_SUPPLY_PROP_ONLINE:
4d96fb1e	61	val->intval = !!gpio_get_value_cansleep(pdata->gpio);
5070437c LPC	62	val->intval ^= pdata->gpio_active_low;
	63	break;
	64	default:
	65	return -EINVAL;
	66	}
	67
	68	return 0;
	69	}
	70
	71	static enum power_supply_property gpio_charger_properties[] = {
	72	POWER_SUPPLY_PROP_ONLINE,
	73	};
	74
c8dd9cce HS	75	static
	76	struct gpio_charger_platform_data gpio_charger_parse_dt(struct device dev)
	77	{
	78	struct device_node *np = dev->of_node;
	79	struct gpio_charger_platform_data *pdata;
	80	const char *chargetype;
	81	enum of_gpio_flags flags;
	82	int ret;
	83
	84	if (!np)
	85	return ERR_PTR(-ENOENT);
	86
	87	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	88	if (!pdata)
	89	return ERR_PTR(-ENOMEM);
	90
	91	pdata->name = np->name;
	92
	93	pdata->gpio = of_get_gpio_flags(np, 0, &flags);
	94	if (pdata->gpio < 0) {
	95	if (pdata->gpio != -EPROBE_DEFER)
	96	dev_err(dev, "could not get charger gpio\n");
	97	return ERR_PTR(pdata->gpio);
	98	}
	99
	100	pdata->gpio_active_low = !!(flags & OF_GPIO_ACTIVE_LOW);
	101
	102	pdata->type = POWER_SUPPLY_TYPE_UNKNOWN;
	103	ret = of_property_read_string(np, "charger-type", &chargetype);
	104	if (ret >= 0) {
	105	if (!strncmp("unknown", chargetype, 7))
	106	pdata->type = POWER_SUPPLY_TYPE_UNKNOWN;
	107	else if (!strncmp("battery", chargetype, 7))
	108	pdata->type = POWER_SUPPLY_TYPE_BATTERY;
	109	else if (!strncmp("ups", chargetype, 3))
	110	pdata->type = POWER_SUPPLY_TYPE_UPS;
	111	else if (!strncmp("mains", chargetype, 5))
	112	pdata->type = POWER_SUPPLY_TYPE_MAINS;
	113	else if (!strncmp("usb-sdp", chargetype, 7))
	114	pdata->type = POWER_SUPPLY_TYPE_USB;
	115	else if (!strncmp("usb-dcp", chargetype, 7))
	116	pdata->type = POWER_SUPPLY_TYPE_USB_DCP;
	117	else if (!strncmp("usb-cdp", chargetype, 7))
	118	pdata->type = POWER_SUPPLY_TYPE_USB_CDP;
	119	else if (!strncmp("usb-aca", chargetype, 7))
	120	pdata->type = POWER_SUPPLY_TYPE_USB_ACA;
	121	else
	122	dev_warn(dev, "unknown charger type %s\n", chargetype);
	123	}
	124
	125	return pdata;
	126	}
	127
c8afa640	128	static int gpio_charger_probe(struct platform_device *pdev)
5070437c LPC	129	{
5070437c LPC	130	const struct gpio_charger_platform_data *pdata = pdev->dev.platform_data;
2dc9215d	131	struct power_supply_config psy_cfg = {};
5070437c	132	struct gpio_charger *gpio_charger;
297d716f	133	struct power_supply_desc *charger_desc;
5070437c LPC	134	int ret;
	135	int irq;
	136
	137	if (!pdata) {
c8dd9cce HS	138	pdata = gpio_charger_parse_dt(&pdev->dev);
	139	if (IS_ERR(pdata)) {
	140	ret = PTR_ERR(pdata);
	141	if (ret != -EPROBE_DEFER)
	142	dev_err(&pdev->dev, "No platform data\n");
	143	return ret;
	144	}
5070437c LPC	145	}
	146
	147	if (!gpio_is_valid(pdata->gpio)) {
	148	dev_err(&pdev->dev, "Invalid gpio pin\n");
	149	return -EINVAL;
	150	}
	151
b92ff855 JH	152	gpio_charger = devm_kzalloc(&pdev->dev, sizeof(*gpio_charger),
b92ff855 JH	153	GFP_KERNEL);
2e9ff5f5 LPC	154	if (!gpio_charger) {
	155	dev_err(&pdev->dev, "Failed to alloc driver structure\n");
	156	return -ENOMEM;
	157	}
5070437c	158
297d716f	159	charger_desc = &gpio_charger->charger_desc;
5070437c	160
297d716f KK	161	charger_desc->name = pdata->name ? pdata->name : "gpio-charger";
	162	charger_desc->type = pdata->type;
	163	charger_desc->properties = gpio_charger_properties;
	164	charger_desc->num_properties = ARRAY_SIZE(gpio_charger_properties);
	165	charger_desc->get_property = gpio_charger_get_property;
2dc9215d KK	166
	167	psy_cfg.supplied_to = pdata->supplied_to;
	168	psy_cfg.num_supplicants = pdata->num_supplicants;
	169	psy_cfg.of_node = pdev->dev.of_node;
297d716f	170	psy_cfg.drv_data = gpio_charger;
5070437c LPC	171
	172	ret = gpio_request(pdata->gpio, dev_name(&pdev->dev));
	173	if (ret) {
	174	dev_err(&pdev->dev, "Failed to request gpio pin: %d\n", ret);
	175	goto err_free;
	176	}
	177	ret = gpio_direction_input(pdata->gpio);
	178	if (ret) {
	179	dev_err(&pdev->dev, "Failed to set gpio to input: %d\n", ret);
	180	goto err_gpio_free;
	181	}
	182
26eb3872 LPC	183	gpio_charger->pdata = pdata;
26eb3872 LPC	184
297d716f KK	185	gpio_charger->charger = power_supply_register(&pdev->dev,
	186	charger_desc, &psy_cfg);
	187	if (IS_ERR(gpio_charger->charger)) {
	188	ret = PTR_ERR(gpio_charger->charger);
26eb3872 LPC	189	dev_err(&pdev->dev, "Failed to register power supply: %d\n",
	190	ret);
	191	goto err_gpio_free;
	192	}
	193
5070437c LPC	194	irq = gpio_to_irq(pdata->gpio);
5070437c LPC	195	if (irq > 0) {
26eb3872	196	ret = request_any_context_irq(irq, gpio_charger_irq,
5070437c	197	IRQF_TRIGGER_RISING \| IRQF_TRIGGER_FALLING,
297d716f	198	dev_name(&pdev->dev), gpio_charger->charger);
f8c63918	199	if (ret < 0)
5070437c LPC	200	dev_warn(&pdev->dev, "Failed to request irq: %d\n", ret);
	201	else
	202	gpio_charger->irq = irq;
	203	}
	204
5070437c LPC	205	platform_set_drvdata(pdev, gpio_charger);
5070437c LPC	206
4ea81266 DES	207	device_init_wakeup(&pdev->dev, 1);
4ea81266 DES	208
5070437c LPC	209	return 0;
5070437c LPC	210
5070437c LPC	211	err_gpio_free:
	212	gpio_free(pdata->gpio);
	213	err_free:
5070437c LPC	214	return ret;
	215	}
	216
415ec69f	217	static int gpio_charger_remove(struct platform_device *pdev)
5070437c LPC	218	{
	219	struct gpio_charger *gpio_charger = platform_get_drvdata(pdev);
	220
5070437c	221	if (gpio_charger->irq)
297d716f	222	free_irq(gpio_charger->irq, gpio_charger->charger);
26eb3872	223
297d716f	224	power_supply_unregister(gpio_charger->charger);
26eb3872	225
5070437c LPC	226	gpio_free(gpio_charger->pdata->gpio);
5070437c LPC	227
5070437c LPC	228	return 0;
	229	}
	230
f10513de	231	#ifdef CONFIG_PM_SLEEP
4ea81266 DES	232	static int gpio_charger_suspend(struct device *dev)
	233	{
	234	struct gpio_charger *gpio_charger = dev_get_drvdata(dev);
	235
	236	if (device_may_wakeup(dev))
	237	gpio_charger->wakeup_enabled =
faeed51b	238	!enable_irq_wake(gpio_charger->irq);
4ea81266 DES	239
	240	return 0;
	241	}
	242
f10513de BL	243	static int gpio_charger_resume(struct device *dev)
	244	{
	245	struct platform_device *pdev = to_platform_device(dev);
	246	struct gpio_charger *gpio_charger = platform_get_drvdata(pdev);
	247
faeed51b	248	if (device_may_wakeup(dev) && gpio_charger->wakeup_enabled)
4ea81266	249	disable_irq_wake(gpio_charger->irq);
297d716f	250	power_supply_changed(gpio_charger->charger);
f10513de BL	251
	252	return 0;
	253	}
	254	#endif
	255
4ea81266 DES	256	static SIMPLE_DEV_PM_OPS(gpio_charger_pm_ops,
4ea81266 DES	257	gpio_charger_suspend, gpio_charger_resume);
f10513de	258
c8dd9cce HS	259	static const struct of_device_id gpio_charger_match[] = {
	260	{ .compatible = "gpio-charger" },
	261	{ }
	262	};
	263	MODULE_DEVICE_TABLE(of, gpio_charger_match);
	264
5070437c LPC	265	static struct platform_driver gpio_charger_driver = {
5070437c LPC	266	.probe = gpio_charger_probe,
28ea73f4	267	.remove = gpio_charger_remove,
5070437c LPC	268	.driver = {
5070437c LPC	269	.name = "gpio-charger",
f10513de	270	.pm = &gpio_charger_pm_ops,
c8dd9cce	271	.of_match_table = gpio_charger_match,
5070437c LPC	272	},
	273	};
	274
300bac7f	275	module_platform_driver(gpio_charger_driver);
5070437c LPC	276
	277	MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
	278	MODULE_DESCRIPTION("Driver for chargers which report their online status through a GPIO");
	279	MODULE_LICENSE("GPL");
	280	MODULE_ALIAS("platform:gpio-charger");