[linux-2.6-block.git] / drivers / power / supply / 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> /* For legacy platform data */
#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/gpio/consumer.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;
	struct gpio_desc *gpiod;
	bool legacy_gpio_requested;
};

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 = gpiod_get_value_cansleep(gpio_charger->gpiod);
		/* This xor is only ever used with legacy 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;
	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->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;
		}
	}

	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;
	}

	/*
	 * This will fetch a GPIO descriptor from device tree, ACPI or
	 * boardfile descriptor tables. It's good to try this first.
	 */
	gpio_charger->gpiod = devm_gpiod_get(&pdev->dev, NULL, GPIOD_IN);

	/*
	 * If this fails and we're not using device tree, try the
	 * legacy platform data method.
	 */
	if (IS_ERR(gpio_charger->gpiod) && !pdev->dev.of_node) {
		/* Non-DT: use legacy GPIO numbers */
		if (!gpio_is_valid(pdata->gpio)) {
			dev_err(&pdev->dev, "Invalid gpio pin in pdata\n");
			return -EINVAL;
		}
		ret = gpio_request(pdata->gpio, dev_name(&pdev->dev));
		if (ret) {
			dev_err(&pdev->dev, "Failed to request gpio pin: %d\n",
				ret);
			return ret;
		}
		gpio_charger->legacy_gpio_requested = true;
		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;
		}
		/* Then convert this to gpiod for now */
		gpio_charger->gpiod = gpio_to_desc(pdata->gpio);
	} else if (IS_ERR(gpio_charger->gpiod)) {
		/* Just try again if this happens */
		if (PTR_ERR(gpio_charger->gpiod) == -EPROBE_DEFER)
			return -EPROBE_DEFER;
		dev_err(&pdev->dev, "error getting GPIO descriptor\n");
		return PTR_ERR(gpio_charger->gpiod);
	}

	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;

	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 = gpiod_to_irq(gpio_charger->gpiod);
	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:
	if (gpio_charger->legacy_gpio_requested)
		gpio_free(pdata->gpio);
	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);

	if (gpio_charger->legacy_gpio_requested)
		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>
fb9a33ae	17	#include <linux/gpio.h> /* For legacy platform data */
5070437c LPC	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	25	#include <linux/of.h>
fb9a33ae	26	#include <linux/gpio/consumer.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;
fb9a33ae LW	37	struct gpio_desc *gpiod;
fb9a33ae LW	38	bool legacy_gpio_requested;
5070437c LPC	39	};
	40
	41	static irqreturn_t gpio_charger_irq(int irq, void *devid)
	42	{
	43	struct power_supply *charger = devid;
	44
	45	power_supply_changed(charger);
	46
	47	return IRQ_HANDLED;
	48	}
	49
	50	static inline struct gpio_charger psy_to_gpio_charger(struct power_supply psy)
	51	{
297d716f	52	return power_supply_get_drvdata(psy);
5070437c LPC	53	}
	54
	55	static int gpio_charger_get_property(struct power_supply *psy,
	56	enum power_supply_property psp, union power_supply_propval *val)
	57	{
	58	struct gpio_charger *gpio_charger = psy_to_gpio_charger(psy);
	59	const struct gpio_charger_platform_data *pdata = gpio_charger->pdata;
	60
	61	switch (psp) {
	62	case POWER_SUPPLY_PROP_ONLINE:
fb9a33ae LW	63	val->intval = gpiod_get_value_cansleep(gpio_charger->gpiod);
fb9a33ae LW	64	/* This xor is only ever used with legacy pdata GPIO */
5070437c LPC	65	val->intval ^= pdata->gpio_active_low;
	66	break;
	67	default:
	68	return -EINVAL;
	69	}
	70
	71	return 0;
	72	}
	73
	74	static enum power_supply_property gpio_charger_properties[] = {
	75	POWER_SUPPLY_PROP_ONLINE,
	76	};
	77
c8dd9cce HS	78	static
	79	struct gpio_charger_platform_data gpio_charger_parse_dt(struct device dev)
	80	{
	81	struct device_node *np = dev->of_node;
	82	struct gpio_charger_platform_data *pdata;
	83	const char *chargetype;
c8dd9cce HS	84	int ret;
	85
	86	if (!np)
	87	return ERR_PTR(-ENOENT);
	88
	89	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	90	if (!pdata)
	91	return ERR_PTR(-ENOMEM);
	92
	93	pdata->name = np->name;
c8dd9cce HS	94	pdata->type = POWER_SUPPLY_TYPE_UNKNOWN;
	95	ret = of_property_read_string(np, "charger-type", &chargetype);
	96	if (ret >= 0) {
	97	if (!strncmp("unknown", chargetype, 7))
	98	pdata->type = POWER_SUPPLY_TYPE_UNKNOWN;
	99	else if (!strncmp("battery", chargetype, 7))
	100	pdata->type = POWER_SUPPLY_TYPE_BATTERY;
	101	else if (!strncmp("ups", chargetype, 3))
	102	pdata->type = POWER_SUPPLY_TYPE_UPS;
	103	else if (!strncmp("mains", chargetype, 5))
	104	pdata->type = POWER_SUPPLY_TYPE_MAINS;
	105	else if (!strncmp("usb-sdp", chargetype, 7))
	106	pdata->type = POWER_SUPPLY_TYPE_USB;
	107	else if (!strncmp("usb-dcp", chargetype, 7))
	108	pdata->type = POWER_SUPPLY_TYPE_USB_DCP;
	109	else if (!strncmp("usb-cdp", chargetype, 7))
	110	pdata->type = POWER_SUPPLY_TYPE_USB_CDP;
	111	else if (!strncmp("usb-aca", chargetype, 7))
	112	pdata->type = POWER_SUPPLY_TYPE_USB_ACA;
	113	else
	114	dev_warn(dev, "unknown charger type %s\n", chargetype);
	115	}
	116
	117	return pdata;
	118	}
	119
c8afa640	120	static int gpio_charger_probe(struct platform_device *pdev)
5070437c LPC	121	{
5070437c LPC	122	const struct gpio_charger_platform_data *pdata = pdev->dev.platform_data;
2dc9215d	123	struct power_supply_config psy_cfg = {};
5070437c	124	struct gpio_charger *gpio_charger;
297d716f	125	struct power_supply_desc *charger_desc;
5070437c LPC	126	int ret;
	127	int irq;
	128
	129	if (!pdata) {
c8dd9cce HS	130	pdata = gpio_charger_parse_dt(&pdev->dev);
	131	if (IS_ERR(pdata)) {
	132	ret = PTR_ERR(pdata);
	133	if (ret != -EPROBE_DEFER)
	134	dev_err(&pdev->dev, "No platform data\n");
	135	return ret;
	136	}
5070437c LPC	137	}
5070437c LPC	138
b92ff855 JH	139	gpio_charger = devm_kzalloc(&pdev->dev, sizeof(*gpio_charger),
b92ff855 JH	140	GFP_KERNEL);
2e9ff5f5 LPC	141	if (!gpio_charger) {
	142	dev_err(&pdev->dev, "Failed to alloc driver structure\n");
	143	return -ENOMEM;
	144	}
5070437c	145
fb9a33ae LW	146	/*
	147	* This will fetch a GPIO descriptor from device tree, ACPI or
	148	* boardfile descriptor tables. It's good to try this first.
	149	*/
	150	gpio_charger->gpiod = devm_gpiod_get(&pdev->dev, NULL, GPIOD_IN);
	151
	152	/*
	153	* If this fails and we're not using device tree, try the
	154	* legacy platform data method.
	155	*/
	156	if (IS_ERR(gpio_charger->gpiod) && !pdev->dev.of_node) {
	157	/* Non-DT: use legacy GPIO numbers */
	158	if (!gpio_is_valid(pdata->gpio)) {
	159	dev_err(&pdev->dev, "Invalid gpio pin in pdata\n");
	160	return -EINVAL;
	161	}
	162	ret = gpio_request(pdata->gpio, dev_name(&pdev->dev));
	163	if (ret) {
	164	dev_err(&pdev->dev, "Failed to request gpio pin: %d\n",
	165	ret);
	166	return ret;
	167	}
	168	gpio_charger->legacy_gpio_requested = true;
	169	ret = gpio_direction_input(pdata->gpio);
	170	if (ret) {
	171	dev_err(&pdev->dev, "Failed to set gpio to input: %d\n",
	172	ret);
	173	goto err_gpio_free;
	174	}
	175	/* Then convert this to gpiod for now */
	176	gpio_charger->gpiod = gpio_to_desc(pdata->gpio);
	177	} else if (IS_ERR(gpio_charger->gpiod)) {
	178	/* Just try again if this happens */
	179	if (PTR_ERR(gpio_charger->gpiod) == -EPROBE_DEFER)
	180	return -EPROBE_DEFER;
	181	dev_err(&pdev->dev, "error getting GPIO descriptor\n");
	182	return PTR_ERR(gpio_charger->gpiod);
	183	}
	184
297d716f	185	charger_desc = &gpio_charger->charger_desc;
5070437c	186
297d716f KK	187	charger_desc->name = pdata->name ? pdata->name : "gpio-charger";
	188	charger_desc->type = pdata->type;
	189	charger_desc->properties = gpio_charger_properties;
	190	charger_desc->num_properties = ARRAY_SIZE(gpio_charger_properties);
	191	charger_desc->get_property = gpio_charger_get_property;
2dc9215d KK	192
	193	psy_cfg.supplied_to = pdata->supplied_to;
	194	psy_cfg.num_supplicants = pdata->num_supplicants;
	195	psy_cfg.of_node = pdev->dev.of_node;
297d716f	196	psy_cfg.drv_data = gpio_charger;
5070437c	197
26eb3872 LPC	198	gpio_charger->pdata = pdata;
26eb3872 LPC	199
297d716f KK	200	gpio_charger->charger = power_supply_register(&pdev->dev,
	201	charger_desc, &psy_cfg);
	202	if (IS_ERR(gpio_charger->charger)) {
	203	ret = PTR_ERR(gpio_charger->charger);
26eb3872 LPC	204	dev_err(&pdev->dev, "Failed to register power supply: %d\n",
	205	ret);
	206	goto err_gpio_free;
	207	}
	208
fb9a33ae	209	irq = gpiod_to_irq(gpio_charger->gpiod);
5070437c	210	if (irq > 0) {
26eb3872	211	ret = request_any_context_irq(irq, gpio_charger_irq,
5070437c	212	IRQF_TRIGGER_RISING \| IRQF_TRIGGER_FALLING,
297d716f	213	dev_name(&pdev->dev), gpio_charger->charger);
f8c63918	214	if (ret < 0)
5070437c LPC	215	dev_warn(&pdev->dev, "Failed to request irq: %d\n", ret);
	216	else
	217	gpio_charger->irq = irq;
	218	}
	219
5070437c LPC	220	platform_set_drvdata(pdev, gpio_charger);
5070437c LPC	221
4ea81266 DES	222	device_init_wakeup(&pdev->dev, 1);
4ea81266 DES	223
5070437c LPC	224	return 0;
5070437c LPC	225
5070437c	226	err_gpio_free:
fb9a33ae LW	227	if (gpio_charger->legacy_gpio_requested)
fb9a33ae LW	228	gpio_free(pdata->gpio);
5070437c LPC	229	return ret;
	230	}
	231
415ec69f	232	static int gpio_charger_remove(struct platform_device *pdev)
5070437c LPC	233	{
	234	struct gpio_charger *gpio_charger = platform_get_drvdata(pdev);
	235
5070437c	236	if (gpio_charger->irq)
297d716f	237	free_irq(gpio_charger->irq, gpio_charger->charger);
26eb3872	238
297d716f	239	power_supply_unregister(gpio_charger->charger);
26eb3872	240
fb9a33ae LW	241	if (gpio_charger->legacy_gpio_requested)
fb9a33ae LW	242	gpio_free(gpio_charger->pdata->gpio);
5070437c	243
5070437c LPC	244	return 0;
	245	}
	246
f10513de	247	#ifdef CONFIG_PM_SLEEP
4ea81266 DES	248	static int gpio_charger_suspend(struct device *dev)
	249	{
	250	struct gpio_charger *gpio_charger = dev_get_drvdata(dev);
	251
	252	if (device_may_wakeup(dev))
	253	gpio_charger->wakeup_enabled =
faeed51b	254	!enable_irq_wake(gpio_charger->irq);
4ea81266 DES	255
	256	return 0;
	257	}
	258
f10513de BL	259	static int gpio_charger_resume(struct device *dev)
	260	{
	261	struct platform_device *pdev = to_platform_device(dev);
	262	struct gpio_charger *gpio_charger = platform_get_drvdata(pdev);
	263
faeed51b	264	if (device_may_wakeup(dev) && gpio_charger->wakeup_enabled)
4ea81266	265	disable_irq_wake(gpio_charger->irq);
297d716f	266	power_supply_changed(gpio_charger->charger);
f10513de BL	267
	268	return 0;
	269	}
	270	#endif
	271
4ea81266 DES	272	static SIMPLE_DEV_PM_OPS(gpio_charger_pm_ops,
4ea81266 DES	273	gpio_charger_suspend, gpio_charger_resume);
f10513de	274
c8dd9cce HS	275	static const struct of_device_id gpio_charger_match[] = {
	276	{ .compatible = "gpio-charger" },
	277	{ }
	278	};
	279	MODULE_DEVICE_TABLE(of, gpio_charger_match);
	280
5070437c LPC	281	static struct platform_driver gpio_charger_driver = {
5070437c LPC	282	.probe = gpio_charger_probe,
28ea73f4	283	.remove = gpio_charger_remove,
5070437c LPC	284	.driver = {
5070437c LPC	285	.name = "gpio-charger",
f10513de	286	.pm = &gpio_charger_pm_ops,
c8dd9cce	287	.of_match_table = gpio_charger_match,
5070437c LPC	288	},
	289	};
	290
300bac7f	291	module_platform_driver(gpio_charger_driver);
5070437c LPC	292
	293	MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
	294	MODULE_DESCRIPTION("Driver for chargers which report their online status through a GPIO");
	295	MODULE_LICENSE("GPL");
	296	MODULE_ALIAS("platform:gpio-charger");