[deliverable/linux.git] / drivers / power / pda_power.c

/*
 * Common power driver for PDAs and phones with one or two external
 * power supplies (AC/USB) connected to main and backup batteries,
 * and optional builtin charger.
 *
 * Copyright © 2007 Anton Vorontsov <cbou@mail.ru>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/power_supply.h>
#include <linux/pda_power.h>
#include <linux/timer.h>
#include <linux/jiffies.h>

static inline unsigned int get_irq_flags(struct resource *res)
{
	unsigned int flags = IRQF_DISABLED | IRQF_SHARED;

	flags |= res->flags & IRQF_TRIGGER_MASK;

	return flags;
}

static struct device *dev;
static struct pda_power_pdata *pdata;
static struct resource *ac_irq, *usb_irq;
static struct timer_list charger_timer;
static struct timer_list supply_timer;

static int pda_power_get_property(struct power_supply *psy,
				  enum power_supply_property psp,
				  union power_supply_propval *val)
{
	switch (psp) {
	case POWER_SUPPLY_PROP_ONLINE:
		if (psy->type == POWER_SUPPLY_TYPE_MAINS)
			val->intval = pdata->is_ac_online ?
				      pdata->is_ac_online() : 0;
		else
			val->intval = pdata->is_usb_online ?
				      pdata->is_usb_online() : 0;
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

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

static char *pda_power_supplied_to[] = {
	"main-battery",
	"backup-battery",
};

static struct power_supply pda_power_supplies[] = {
	{
		.name = "ac",
		.type = POWER_SUPPLY_TYPE_MAINS,
		.supplied_to = pda_power_supplied_to,
		.num_supplicants = ARRAY_SIZE(pda_power_supplied_to),
		.properties = pda_power_props,
		.num_properties = ARRAY_SIZE(pda_power_props),
		.get_property = pda_power_get_property,
	},
	{
		.name = "usb",
		.type = POWER_SUPPLY_TYPE_USB,
		.supplied_to = pda_power_supplied_to,
		.num_supplicants = ARRAY_SIZE(pda_power_supplied_to),
		.properties = pda_power_props,
		.num_properties = ARRAY_SIZE(pda_power_props),
		.get_property = pda_power_get_property,
	},
};

static void update_charger(void)
{
	if (!pdata->set_charge)
		return;

	if (pdata->is_ac_online && pdata->is_ac_online()) {
		dev_dbg(dev, "charger on (AC)\n");
		pdata->set_charge(PDA_POWER_CHARGE_AC);
	} else if (pdata->is_usb_online && pdata->is_usb_online()) {
		dev_dbg(dev, "charger on (USB)\n");
		pdata->set_charge(PDA_POWER_CHARGE_USB);
	} else {
		dev_dbg(dev, "charger off\n");
		pdata->set_charge(0);
	}
}

static void supply_timer_func(unsigned long power_supply_ptr)
{
	void *power_supply = (void *)power_supply_ptr;

	power_supply_changed(power_supply);
}

static void charger_timer_func(unsigned long power_supply_ptr)
{
	update_charger();

	/* Okay, charger set. Now wait a bit before notifying supplicants,
	 * charge power should stabilize. */
	supply_timer.data = power_supply_ptr;
	mod_timer(&supply_timer,
		  jiffies + msecs_to_jiffies(pdata->wait_for_charger));
}

static irqreturn_t power_changed_isr(int irq, void *power_supply)
{
	/* Wait a bit before reading ac/usb line status and setting charger,
	 * because ac/usb status readings may lag from irq. */
	charger_timer.data = (unsigned long)power_supply;
	mod_timer(&charger_timer,
		  jiffies + msecs_to_jiffies(pdata->wait_for_status));
	return IRQ_HANDLED;
}

static int pda_power_probe(struct platform_device *pdev)
{
	int ret = 0;

	dev = &pdev->dev;

	if (pdev->id != -1) {
		dev_err(dev, "it's meaningless to register several "
			"pda_powers; use id = -1\n");
		ret = -EINVAL;
		goto wrongid;
	}

	pdata = pdev->dev.platform_data;

	update_charger();

	if (!pdata->wait_for_status)
		pdata->wait_for_status = 500;

	if (!pdata->wait_for_charger)
		pdata->wait_for_charger = 500;

	setup_timer(&charger_timer, charger_timer_func, 0);
	setup_timer(&supply_timer, supply_timer_func, 0);

	ac_irq = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "ac");
	usb_irq = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "usb");
	if (!ac_irq && !usb_irq) {
		dev_err(dev, "no ac/usb irq specified\n");
		ret = -ENODEV;
		goto noirqs;
	}

	if (pdata->supplied_to) {
		pda_power_supplies[0].supplied_to = pdata->supplied_to;
		pda_power_supplies[1].supplied_to = pdata->supplied_to;
		pda_power_supplies[0].num_supplicants = pdata->num_supplicants;
		pda_power_supplies[1].num_supplicants = pdata->num_supplicants;
	}

	if (pdata->is_ac_online) {
		ret = power_supply_register(&pdev->dev, &pda_power_supplies[0]);
		if (ret) {
			dev_err(dev, "failed to register %s power supply\n",
				pda_power_supplies[0].name);
			goto ac_supply_failed;
		}

		if (ac_irq) {
			ret = request_irq(ac_irq->start, power_changed_isr,
					  get_irq_flags(ac_irq), ac_irq->name,
					  &pda_power_supplies[0]);
			if (ret) {
				dev_err(dev, "request ac irq failed\n");
				goto ac_irq_failed;
			}
		}
	}

	if (pdata->is_usb_online) {
		ret = power_supply_register(&pdev->dev, &pda_power_supplies[1]);
		if (ret) {
			dev_err(dev, "failed to register %s power supply\n",
				pda_power_supplies[1].name);
			goto usb_supply_failed;
		}

		if (usb_irq) {
			ret = request_irq(usb_irq->start, power_changed_isr,
					  get_irq_flags(usb_irq),
					  usb_irq->name,
					  &pda_power_supplies[1]);
			if (ret) {
				dev_err(dev, "request usb irq failed\n");
				goto usb_irq_failed;
			}
		}
	}

	return 0;

usb_irq_failed:
	if (pdata->is_usb_online)
		power_supply_unregister(&pda_power_supplies[1]);
usb_supply_failed:
	if (pdata->is_ac_online && ac_irq)
		free_irq(ac_irq->start, &pda_power_supplies[0]);
ac_irq_failed:
	if (pdata->is_ac_online)
		power_supply_unregister(&pda_power_supplies[0]);
ac_supply_failed:
noirqs:
wrongid:
	return ret;
}

static int pda_power_remove(struct platform_device *pdev)
{
	if (pdata->is_usb_online && usb_irq)
		free_irq(usb_irq->start, &pda_power_supplies[1]);
	if (pdata->is_ac_online && ac_irq)
		free_irq(ac_irq->start, &pda_power_supplies[0]);
	del_timer_sync(&charger_timer);
	del_timer_sync(&supply_timer);
	if (pdata->is_usb_online)
		power_supply_unregister(&pda_power_supplies[1]);
	if (pdata->is_ac_online)
		power_supply_unregister(&pda_power_supplies[0]);
	return 0;
}

static struct platform_driver pda_power_pdrv = {
	.driver = {
		.name = "pda-power",
	},
	.probe = pda_power_probe,
	.remove = pda_power_remove,
};

static int __init pda_power_init(void)
{
	return platform_driver_register(&pda_power_pdrv);
}

static void __exit pda_power_exit(void)
{
	platform_driver_unregister(&pda_power_pdrv);
}

module_init(pda_power_init);
module_exit(pda_power_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Anton Vorontsov <cbou@mail.ru>");
Commit	Line	Data
b2998049 AV	1	/*
	2	* Common power driver for PDAs and phones with one or two external
	3	* power supplies (AC/USB) connected to main and backup batteries,
	4	* and optional builtin charger.
	5	*
	6	* Copyright © 2007 Anton Vorontsov <cbou@mail.ru>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*/
	12
	13	#include <linux/module.h>
	14	#include <linux/platform_device.h>
	15	#include <linux/interrupt.h>
	16	#include <linux/power_supply.h>
	17	#include <linux/pda_power.h>
	18	#include <linux/timer.h>
	19	#include <linux/jiffies.h>
	20
	21	static inline unsigned int get_irq_flags(struct resource *res)
	22	{
	23	unsigned int flags = IRQF_DISABLED \| IRQF_SHARED;
	24
	25	flags \|= res->flags & IRQF_TRIGGER_MASK;
	26
	27	return flags;
	28	}
	29
	30	static struct device *dev;
	31	static struct pda_power_pdata *pdata;
	32	static struct resource ac_irq, usb_irq;
	33	static struct timer_list charger_timer;
	34	static struct timer_list supply_timer;
	35
	36	static int pda_power_get_property(struct power_supply *psy,
	37	enum power_supply_property psp,
	38	union power_supply_propval *val)
	39	{
	40	switch (psp) {
	41	case POWER_SUPPLY_PROP_ONLINE:
	42	if (psy->type == POWER_SUPPLY_TYPE_MAINS)
	43	val->intval = pdata->is_ac_online ?
	44	pdata->is_ac_online() : 0;
	45	else
	46	val->intval = pdata->is_usb_online ?
	47	pdata->is_usb_online() : 0;
	48	break;
	49	default:
	50	return -EINVAL;
	51	}
	52	return 0;
	53	}
	54
	55	static enum power_supply_property pda_power_props[] = {
	56	POWER_SUPPLY_PROP_ONLINE,
	57	};
	58
	59	static char *pda_power_supplied_to[] = {
	60	"main-battery",
	61	"backup-battery",
	62	};
	63
	64	static struct power_supply pda_power_supplies[] = {
65	{
66	.name = "ac",
67	.type = POWER_SUPPLY_TYPE_MAINS,
68	.supplied_to = pda_power_supplied_to,
69	.num_supplicants = ARRAY_SIZE(pda_power_supplied_to),
70	.properties = pda_power_props,
71	.num_properties = ARRAY_SIZE(pda_power_props),
72	.get_property = pda_power_get_property,
73	},
74	{
75	.name = "usb",
76	.type = POWER_SUPPLY_TYPE_USB,
77	.supplied_to = pda_power_supplied_to,
78	.num_supplicants = ARRAY_SIZE(pda_power_supplied_to),
79	.properties = pda_power_props,
80	.num_properties = ARRAY_SIZE(pda_power_props),
81	.get_property = pda_power_get_property,
82	},
83	};
84
85	static void update_charger(void)
86	{
87	if (!pdata->set_charge)
88	return;
89
90	if (pdata->is_ac_online && pdata->is_ac_online()) {
91	dev_dbg(dev, "charger on (AC)\n");
92	pdata->set_charge(PDA_POWER_CHARGE_AC);
93	} else if (pdata->is_usb_online && pdata->is_usb_online()) {
94	dev_dbg(dev, "charger on (USB)\n");
95	pdata->set_charge(PDA_POWER_CHARGE_USB);
96	} else {
97	dev_dbg(dev, "charger off\n");
98	pdata->set_charge(0);
99	}
b2998049 AV	100	}
b2998049 AV	101
5ebf6e6a	102	static void supply_timer_func(unsigned long power_supply_ptr)
b2998049	103	{
5ebf6e6a JG	104	void power_supply = (void )power_supply_ptr;
	105
	106	power_supply_changed(power_supply);
b2998049 AV	107	}
b2998049 AV	108
5ebf6e6a	109	static void charger_timer_func(unsigned long power_supply_ptr)
b2998049 AV	110	{
	111	update_charger();
	112
	113	/* Okay, charger set. Now wait a bit before notifying supplicants,
	114	* charge power should stabilize. */
5ebf6e6a	115	supply_timer.data = power_supply_ptr;
b2998049 AV	116	mod_timer(&supply_timer,
b2998049 AV	117	jiffies + msecs_to_jiffies(pdata->wait_for_charger));
b2998049 AV	118	}
b2998049 AV	119
5ebf6e6a	120	static irqreturn_t power_changed_isr(int irq, void *power_supply)
b2998049 AV	121	{
	122	/* Wait a bit before reading ac/usb line status and setting charger,
	123	* because ac/usb status readings may lag from irq. */
5ebf6e6a	124	charger_timer.data = (unsigned long)power_supply;
b2998049 AV	125	mod_timer(&charger_timer,
	126	jiffies + msecs_to_jiffies(pdata->wait_for_status));
	127	return IRQ_HANDLED;
	128	}
	129
	130	static int pda_power_probe(struct platform_device *pdev)
	131	{
	132	int ret = 0;
	133
	134	dev = &pdev->dev;
	135
	136	if (pdev->id != -1) {
	137	dev_err(dev, "it's meaningless to register several "
	138	"pda_powers; use id = -1\n");
	139	ret = -EINVAL;
	140	goto wrongid;
	141	}
	142
	143	pdata = pdev->dev.platform_data;
	144
	145	update_charger();
	146
	147	if (!pdata->wait_for_status)
	148	pdata->wait_for_status = 500;
	149
	150	if (!pdata->wait_for_charger)
	151	pdata->wait_for_charger = 500;
	152
	153	setup_timer(&charger_timer, charger_timer_func, 0);
	154	setup_timer(&supply_timer, supply_timer_func, 0);
	155
	156	ac_irq = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "ac");
	157	usb_irq = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "usb");
	158	if (!ac_irq && !usb_irq) {
	159	dev_err(dev, "no ac/usb irq specified\n");
	160	ret = -ENODEV;
	161	goto noirqs;
	162	}
	163
	164	if (pdata->supplied_to) {
	165	pda_power_supplies[0].supplied_to = pdata->supplied_to;
	166	pda_power_supplies[1].supplied_to = pdata->supplied_to;
	167	pda_power_supplies[0].num_supplicants = pdata->num_supplicants;
	168	pda_power_supplies[1].num_supplicants = pdata->num_supplicants;
	169	}
	170
9ef45106 DB	171	if (pdata->is_ac_online) {
	172	ret = power_supply_register(&pdev->dev, &pda_power_supplies[0]);
	173	if (ret) {
	174	dev_err(dev, "failed to register %s power supply\n",
	175	pda_power_supplies[0].name);
	176	goto ac_supply_failed;
	177	}
b2998049	178
9ef45106 DB	179	if (ac_irq) {
	180	ret = request_irq(ac_irq->start, power_changed_isr,
	181	get_irq_flags(ac_irq), ac_irq->name,
	182	&pda_power_supplies[0]);
	183	if (ret) {
	184	dev_err(dev, "request ac irq failed\n");
	185	goto ac_irq_failed;
	186	}
	187	}
b2998049 AV	188	}
b2998049 AV	189
9ef45106 DB	190	if (pdata->is_usb_online) {
9ef45106 DB	191	ret = power_supply_register(&pdev->dev, &pda_power_supplies[1]);
b2998049	192	if (ret) {
9ef45106 DB	193	dev_err(dev, "failed to register %s power supply\n",
	194	pda_power_supplies[1].name);
	195	goto usb_supply_failed;
b2998049	196	}
b2998049	197
9ef45106 DB	198	if (usb_irq) {
	199	ret = request_irq(usb_irq->start, power_changed_isr,
	200	get_irq_flags(usb_irq),
	201	usb_irq->name,
	202	&pda_power_supplies[1]);
	203	if (ret) {
	204	dev_err(dev, "request usb irq failed\n");
	205	goto usb_irq_failed;
	206	}
b2998049 AV	207	}
	208	}
	209
9ef45106	210	return 0;
b2998049 AV	211
b2998049 AV	212	usb_irq_failed:
9ef45106 DB	213	if (pdata->is_usb_online)
	214	power_supply_unregister(&pda_power_supplies[1]);
	215	usb_supply_failed:
	216	if (pdata->is_ac_online && ac_irq)
b2998049 AV	217	free_irq(ac_irq->start, &pda_power_supplies[0]);
b2998049 AV	218	ac_irq_failed:
9ef45106 DB	219	if (pdata->is_ac_online)
	220	power_supply_unregister(&pda_power_supplies[0]);
	221	ac_supply_failed:
b2998049 AV	222	noirqs:
b2998049 AV	223	wrongid:
b2998049 AV	224	return ret;
	225	}
	226
	227	static int pda_power_remove(struct platform_device *pdev)
	228	{
9ef45106	229	if (pdata->is_usb_online && usb_irq)
b2998049	230	free_irq(usb_irq->start, &pda_power_supplies[1]);
9ef45106	231	if (pdata->is_ac_online && ac_irq)
b2998049 AV	232	free_irq(ac_irq->start, &pda_power_supplies[0]);
	233	del_timer_sync(&charger_timer);
	234	del_timer_sync(&supply_timer);
9ef45106 DB	235	if (pdata->is_usb_online)
	236	power_supply_unregister(&pda_power_supplies[1]);
	237	if (pdata->is_ac_online)
	238	power_supply_unregister(&pda_power_supplies[0]);
b2998049 AV	239	return 0;
	240	}
	241
	242	static struct platform_driver pda_power_pdrv = {
	243	.driver = {
	244	.name = "pda-power",
	245	},
	246	.probe = pda_power_probe,
	247	.remove = pda_power_remove,
	248	};
	249
	250	static int __init pda_power_init(void)
	251	{
	252	return platform_driver_register(&pda_power_pdrv);
	253	}
	254
	255	static void __exit pda_power_exit(void)
	256	{
	257	platform_driver_unregister(&pda_power_pdrv);
b2998049 AV	258	}
	259
	260	module_init(pda_power_init);
	261	module_exit(pda_power_exit);
	262	MODULE_LICENSE("GPL");
	263	MODULE_AUTHOR("Anton Vorontsov <cbou@mail.ru>");