[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / power / collie_battery.c

/*
 * Battery and Power Management code for the Sharp SL-5x00
 *
 * Copyright (C) 2009 Thomas Kunze
 *
 * based on tosa_battery.c
 *
 * 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/kernel.h>
#include <linux/module.h>
#include <linux/power_supply.h>
#include <linux/delay.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/gpio.h>
#include <linux/mfd/ucb1x00.h>

#include <asm/mach/sharpsl_param.h>
#include <asm/mach-types.h>
#include <mach/collie.h>

static DEFINE_MUTEX(bat_lock); /* protects gpio pins */
static struct work_struct bat_work;
static struct ucb1x00 *ucb;

struct collie_bat {
	int status;
	struct power_supply psy;
	int full_chrg;

	struct mutex work_lock; /* protects data */

	bool (*is_present)(struct collie_bat *bat);
	int gpio_full;
	int gpio_charge_on;

	int technology;

	int gpio_bat;
	int adc_bat;
	int adc_bat_divider;
	int bat_max;
	int bat_min;

	int gpio_temp;
	int adc_temp;
	int adc_temp_divider;
};

static struct collie_bat collie_bat_main;

static unsigned long collie_read_bat(struct collie_bat *bat)
{
	unsigned long value = 0;

	if (bat->gpio_bat < 0 || bat->adc_bat < 0)
		return 0;
	mutex_lock(&bat_lock);
	gpio_set_value(bat->gpio_bat, 1);
	msleep(5);
	ucb1x00_adc_enable(ucb);
	value = ucb1x00_adc_read(ucb, bat->adc_bat, UCB_SYNC);
	ucb1x00_adc_disable(ucb);
	gpio_set_value(bat->gpio_bat, 0);
	mutex_unlock(&bat_lock);
	value = value * 1000000 / bat->adc_bat_divider;

	return value;
}

static unsigned long collie_read_temp(struct collie_bat *bat)
{
	unsigned long value = 0;
	if (bat->gpio_temp < 0 || bat->adc_temp < 0)
		return 0;

	mutex_lock(&bat_lock);
	gpio_set_value(bat->gpio_temp, 1);
	msleep(5);
	ucb1x00_adc_enable(ucb);
	value = ucb1x00_adc_read(ucb, bat->adc_temp, UCB_SYNC);
	ucb1x00_adc_disable(ucb);
	gpio_set_value(bat->gpio_temp, 0);
	mutex_unlock(&bat_lock);

	value = value * 10000 / bat->adc_temp_divider;

	return value;
}

static int collie_bat_get_property(struct power_supply *psy,
			    enum power_supply_property psp,
			    union power_supply_propval *val)
{
	int ret = 0;
	struct collie_bat *bat = container_of(psy, struct collie_bat, psy);

	if (bat->is_present && !bat->is_present(bat)
			&& psp != POWER_SUPPLY_PROP_PRESENT) {
		return -ENODEV;
	}

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
		val->intval = bat->status;
		break;
	case POWER_SUPPLY_PROP_TECHNOLOGY:
		val->intval = bat->technology;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		val->intval = collie_read_bat(bat);
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_MAX:
		if (bat->full_chrg == -1)
			val->intval = bat->bat_max;
		else
			val->intval = bat->full_chrg;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
		val->intval = bat->bat_max;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
		val->intval = bat->bat_min;
		break;
	case POWER_SUPPLY_PROP_TEMP:
		val->intval = collie_read_temp(bat);
		break;
	case POWER_SUPPLY_PROP_PRESENT:
		val->intval = bat->is_present ? bat->is_present(bat) : 1;
		break;
	default:
		ret = -EINVAL;
		break;
	}
	return ret;
}

static void collie_bat_external_power_changed(struct power_supply *psy)
{
	schedule_work(&bat_work);
}

static irqreturn_t collie_bat_gpio_isr(int irq, void *data)
{
	pr_info("collie_bat_gpio irq\n");
	schedule_work(&bat_work);
	return IRQ_HANDLED;
}

static void collie_bat_update(struct collie_bat *bat)
{
	int old;
	struct power_supply *psy = &bat->psy;

	mutex_lock(&bat->work_lock);

	old = bat->status;

	if (bat->is_present && !bat->is_present(bat)) {
		printk(KERN_NOTICE "%s not present\n", psy->name);
		bat->status = POWER_SUPPLY_STATUS_UNKNOWN;
		bat->full_chrg = -1;
	} else if (power_supply_am_i_supplied(psy)) {
		if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING) {
			gpio_set_value(bat->gpio_charge_on, 1);
			mdelay(15);
		}

		if (gpio_get_value(bat->gpio_full)) {
			if (old == POWER_SUPPLY_STATUS_CHARGING ||
					bat->full_chrg == -1)
				bat->full_chrg = collie_read_bat(bat);

			gpio_set_value(bat->gpio_charge_on, 0);
			bat->status = POWER_SUPPLY_STATUS_FULL;
		} else {
			gpio_set_value(bat->gpio_charge_on, 1);
			bat->status = POWER_SUPPLY_STATUS_CHARGING;
		}
	} else {
		gpio_set_value(bat->gpio_charge_on, 0);
		bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
	}

	if (old != bat->status)
		power_supply_changed(psy);

	mutex_unlock(&bat->work_lock);
}

static void collie_bat_work(struct work_struct *work)
{
	collie_bat_update(&collie_bat_main);
}


static enum power_supply_property collie_bat_main_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_TECHNOLOGY,
	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
	POWER_SUPPLY_PROP_VOLTAGE_MAX,
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_TEMP,
};

static enum power_supply_property collie_bat_bu_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_TECHNOLOGY,
	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
	POWER_SUPPLY_PROP_VOLTAGE_MAX,
	POWER_SUPPLY_PROP_PRESENT,
};

static struct collie_bat collie_bat_main = {
	.status = POWER_SUPPLY_STATUS_DISCHARGING,
	.full_chrg = -1,
	.psy = {
		.name		= "main-battery",
		.type		= POWER_SUPPLY_TYPE_BATTERY,
		.properties	= collie_bat_main_props,
		.num_properties	= ARRAY_SIZE(collie_bat_main_props),
		.get_property	= collie_bat_get_property,
		.external_power_changed = collie_bat_external_power_changed,
		.use_for_apm	= 1,
	},

	.gpio_full = COLLIE_GPIO_CO,
	.gpio_charge_on = COLLIE_GPIO_CHARGE_ON,

	.technology = POWER_SUPPLY_TECHNOLOGY_LIPO,

	.gpio_bat = COLLIE_GPIO_MBAT_ON,
	.adc_bat = UCB_ADC_INP_AD1,
	.adc_bat_divider = 155,
	.bat_max = 4310000,
	.bat_min = 1551 * 1000000 / 414,

	.gpio_temp = COLLIE_GPIO_TMP_ON,
	.adc_temp = UCB_ADC_INP_AD0,
	.adc_temp_divider = 10000,
};

static struct collie_bat collie_bat_bu = {
	.status = POWER_SUPPLY_STATUS_UNKNOWN,
	.full_chrg = -1,

	.psy = {
		.name		= "backup-battery",
		.type		= POWER_SUPPLY_TYPE_BATTERY,
		.properties	= collie_bat_bu_props,
		.num_properties	= ARRAY_SIZE(collie_bat_bu_props),
		.get_property	= collie_bat_get_property,
		.external_power_changed = collie_bat_external_power_changed,
	},

	.gpio_full = -1,
	.gpio_charge_on = -1,

	.technology = POWER_SUPPLY_TECHNOLOGY_LiMn,

	.gpio_bat = COLLIE_GPIO_BBAT_ON,
	.adc_bat = UCB_ADC_INP_AD1,
	.adc_bat_divider = 155,
	.bat_max = 3000000,
	.bat_min = 1900000,

	.gpio_temp = -1,
	.adc_temp = -1,
	.adc_temp_divider = -1,
};

static struct gpio collie_batt_gpios[] = {
	{ COLLIE_GPIO_CO,	    GPIOF_IN,		"main battery full" },
	{ COLLIE_GPIO_MAIN_BAT_LOW, GPIOF_IN,		"main battery low" },
	{ COLLIE_GPIO_CHARGE_ON,    GPIOF_OUT_INIT_LOW,	"main charge on" },
	{ COLLIE_GPIO_MBAT_ON,	    GPIOF_OUT_INIT_LOW,	"main battery" },
	{ COLLIE_GPIO_TMP_ON,	    GPIOF_OUT_INIT_LOW,	"main battery temp" },
	{ COLLIE_GPIO_BBAT_ON,	    GPIOF_OUT_INIT_LOW,	"backup battery" },
};

#ifdef CONFIG_PM
static int collie_bat_suspend(struct ucb1x00_dev *dev, pm_message_t state)
{
	/* flush all pending status updates */
	flush_work(&bat_work);
	return 0;
}

static int collie_bat_resume(struct ucb1x00_dev *dev)
{
	/* things may have changed while we were away */
	schedule_work(&bat_work);
	return 0;
}
#else
#define collie_bat_suspend NULL
#define collie_bat_resume NULL
#endif

static int collie_bat_probe(struct ucb1x00_dev *dev)
{
	int ret;

	if (!machine_is_collie())
		return -ENODEV;

	ucb = dev->ucb;

	ret = gpio_request_array(collie_batt_gpios,
				 ARRAY_SIZE(collie_batt_gpios));
	if (ret)
		return ret;

	mutex_init(&collie_bat_main.work_lock);

	INIT_WORK(&bat_work, collie_bat_work);

	ret = power_supply_register(&dev->ucb->dev, &collie_bat_main.psy);
	if (ret)
		goto err_psy_reg_main;
	ret = power_supply_register(&dev->ucb->dev, &collie_bat_bu.psy);
	if (ret)
		goto err_psy_reg_bu;

	ret = request_irq(gpio_to_irq(COLLIE_GPIO_CO),
				collie_bat_gpio_isr,
				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
				"main full", &collie_bat_main);
	if (!ret) {
		schedule_work(&bat_work);
		return 0;
	}
	power_supply_unregister(&collie_bat_bu.psy);
err_psy_reg_bu:
	power_supply_unregister(&collie_bat_main.psy);
err_psy_reg_main:

	/* see comment in collie_bat_remove */
	cancel_work_sync(&bat_work);
	gpio_free_array(collie_batt_gpios, ARRAY_SIZE(collie_batt_gpios));
	return ret;
}

static void collie_bat_remove(struct ucb1x00_dev *dev)
{
	free_irq(gpio_to_irq(COLLIE_GPIO_CO), &collie_bat_main);

	power_supply_unregister(&collie_bat_bu.psy);
	power_supply_unregister(&collie_bat_main.psy);

	/*
	 * Now cancel the bat_work.  We won't get any more schedules,
	 * since all sources (isr and external_power_changed) are
	 * unregistered now.
	 */
	cancel_work_sync(&bat_work);
	gpio_free_array(collie_batt_gpios, ARRAY_SIZE(collie_batt_gpios));
}

static struct ucb1x00_driver collie_bat_driver = {
	.add		= collie_bat_probe,
	.remove		= collie_bat_remove,
	.suspend	= collie_bat_suspend,
	.resume		= collie_bat_resume,
};

static int __init collie_bat_init(void)
{
	return ucb1x00_register_driver(&collie_bat_driver);
}

static void __exit collie_bat_exit(void)
{
	ucb1x00_unregister_driver(&collie_bat_driver);
}

module_init(collie_bat_init);
module_exit(collie_bat_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Thomas Kunze");
MODULE_DESCRIPTION("Collie battery driver");
Commit	Line	Data
f1fce597 TK	1	/*
	2	* Battery and Power Management code for the Sharp SL-5x00
	3	*
	4	* Copyright (C) 2009 Thomas Kunze
	5	*
	6	* based on tosa_battery.c
	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/kernel.h>
	14	#include <linux/module.h>
	15	#include <linux/power_supply.h>
	16	#include <linux/delay.h>
	17	#include <linux/spinlock.h>
	18	#include <linux/interrupt.h>
	19	#include <linux/gpio.h>
	20	#include <linux/mfd/ucb1x00.h>
	21
	22	#include <asm/mach/sharpsl_param.h>
	23	#include <asm/mach-types.h>
	24	#include <mach/collie.h>
	25
	26	static DEFINE_MUTEX(bat_lock); /* protects gpio pins */
	27	static struct work_struct bat_work;
	28	static struct ucb1x00 *ucb;
	29
	30	struct collie_bat {
	31	int status;
	32	struct power_supply psy;
	33	int full_chrg;
	34
	35	struct mutex work_lock; /* protects data */
	36
	37	bool (is_present)(struct collie_bat bat);
	38	int gpio_full;
	39	int gpio_charge_on;
	40
	41	int technology;
	42
	43	int gpio_bat;
	44	int adc_bat;
	45	int adc_bat_divider;
	46	int bat_max;
	47	int bat_min;
	48
	49	int gpio_temp;
	50	int adc_temp;
	51	int adc_temp_divider;
	52	};
	53
	54	static struct collie_bat collie_bat_main;
	55
	56	static unsigned long collie_read_bat(struct collie_bat *bat)
	57	{
	58	unsigned long value = 0;
	59
	60	if (bat->gpio_bat < 0 \|\| bat->adc_bat < 0)
	61	return 0;
	62	mutex_lock(&bat_lock);
	63	gpio_set_value(bat->gpio_bat, 1);
	64	msleep(5);
65	ucb1x00_adc_enable(ucb);
66	value = ucb1x00_adc_read(ucb, bat->adc_bat, UCB_SYNC);
67	ucb1x00_adc_disable(ucb);
68	gpio_set_value(bat->gpio_bat, 0);
69	mutex_unlock(&bat_lock);
70	value = value * 1000000 / bat->adc_bat_divider;
71
72	return value;
73	}
74
75	static unsigned long collie_read_temp(struct collie_bat *bat)
76	{
77	unsigned long value = 0;
78	if (bat->gpio_temp < 0 \|\| bat->adc_temp < 0)
79	return 0;
80
81	mutex_lock(&bat_lock);
82	gpio_set_value(bat->gpio_temp, 1);
83	msleep(5);
84	ucb1x00_adc_enable(ucb);
85	value = ucb1x00_adc_read(ucb, bat->adc_temp, UCB_SYNC);
86	ucb1x00_adc_disable(ucb);
87	gpio_set_value(bat->gpio_temp, 0);
88	mutex_unlock(&bat_lock);
89
90	value = value * 10000 / bat->adc_temp_divider;
91
92	return value;
93	}
94
95	static int collie_bat_get_property(struct power_supply *psy,
96	enum power_supply_property psp,
97	union power_supply_propval *val)
98	{
99	int ret = 0;
100	struct collie_bat *bat = container_of(psy, struct collie_bat, psy);
101
102	if (bat->is_present && !bat->is_present(bat)
103	&& psp != POWER_SUPPLY_PROP_PRESENT) {
104	return -ENODEV;
105	}
106
107	switch (psp) {
108	case POWER_SUPPLY_PROP_STATUS:
109	val->intval = bat->status;
110	break;
111	case POWER_SUPPLY_PROP_TECHNOLOGY:
112	val->intval = bat->technology;
113	break;
114	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
115	val->intval = collie_read_bat(bat);
116	break;
117	case POWER_SUPPLY_PROP_VOLTAGE_MAX:
118	if (bat->full_chrg == -1)
119	val->intval = bat->bat_max;
120	else
121	val->intval = bat->full_chrg;
122	break;
123	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
124	val->intval = bat->bat_max;
125	break;
126	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
127	val->intval = bat->bat_min;
128	break;
129	case POWER_SUPPLY_PROP_TEMP:
130	val->intval = collie_read_temp(bat);
131	break;
132	case POWER_SUPPLY_PROP_PRESENT:
133	val->intval = bat->is_present ? bat->is_present(bat) : 1;
134	break;
135	default:
136	ret = -EINVAL;
137	break;
138	}
139	return ret;
140	}
141
142	static void collie_bat_external_power_changed(struct power_supply *psy)
143	{
144	schedule_work(&bat_work);
145	}
146
147	static irqreturn_t collie_bat_gpio_isr(int irq, void *data)
148	{
629bcb4b	149	pr_info("collie_bat_gpio irq\n");
f1fce597 TK	150	schedule_work(&bat_work);
	151	return IRQ_HANDLED;
	152	}
	153
	154	static void collie_bat_update(struct collie_bat *bat)
	155	{
	156	int old;
	157	struct power_supply *psy = &bat->psy;
	158
	159	mutex_lock(&bat->work_lock);
	160
	161	old = bat->status;
	162
	163	if (bat->is_present && !bat->is_present(bat)) {
	164	printk(KERN_NOTICE "%s not present\n", psy->name);
	165	bat->status = POWER_SUPPLY_STATUS_UNKNOWN;
	166	bat->full_chrg = -1;
	167	} else if (power_supply_am_i_supplied(psy)) {
	168	if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING) {
	169	gpio_set_value(bat->gpio_charge_on, 1);
	170	mdelay(15);
	171	}
	172
	173	if (gpio_get_value(bat->gpio_full)) {
	174	if (old == POWER_SUPPLY_STATUS_CHARGING \|\|
	175	bat->full_chrg == -1)
	176	bat->full_chrg = collie_read_bat(bat);
	177
	178	gpio_set_value(bat->gpio_charge_on, 0);
	179	bat->status = POWER_SUPPLY_STATUS_FULL;
	180	} else {
	181	gpio_set_value(bat->gpio_charge_on, 1);
	182	bat->status = POWER_SUPPLY_STATUS_CHARGING;
	183	}
	184	} else {
	185	gpio_set_value(bat->gpio_charge_on, 0);
	186	bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
	187	}
	188
	189	if (old != bat->status)
	190	power_supply_changed(psy);
	191
	192	mutex_unlock(&bat->work_lock);
	193	}
	194
	195	static void collie_bat_work(struct work_struct *work)
	196	{
	197	collie_bat_update(&collie_bat_main);
	198	}
	199
	200
	201	static enum power_supply_property collie_bat_main_props[] = {
	202	POWER_SUPPLY_PROP_STATUS,
	203	POWER_SUPPLY_PROP_TECHNOLOGY,
	204	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
	205	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	206	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
	207	POWER_SUPPLY_PROP_VOLTAGE_MAX,
	208	POWER_SUPPLY_PROP_PRESENT,
	209	POWER_SUPPLY_PROP_TEMP,
	210	};
	211
	212	static enum power_supply_property collie_bat_bu_props[] = {
	213	POWER_SUPPLY_PROP_STATUS,
214	POWER_SUPPLY_PROP_TECHNOLOGY,
215	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
216	POWER_SUPPLY_PROP_VOLTAGE_NOW,
217	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
218	POWER_SUPPLY_PROP_VOLTAGE_MAX,
219	POWER_SUPPLY_PROP_PRESENT,
220	};
221
222	static struct collie_bat collie_bat_main = {
223	.status = POWER_SUPPLY_STATUS_DISCHARGING,
224	.full_chrg = -1,
225	.psy = {
226	.name = "main-battery",
227	.type = POWER_SUPPLY_TYPE_BATTERY,
228	.properties = collie_bat_main_props,
229	.num_properties = ARRAY_SIZE(collie_bat_main_props),
230	.get_property = collie_bat_get_property,
231	.external_power_changed = collie_bat_external_power_changed,
232	.use_for_apm = 1,
233	},
234
235	.gpio_full = COLLIE_GPIO_CO,
236	.gpio_charge_on = COLLIE_GPIO_CHARGE_ON,
237
238	.technology = POWER_SUPPLY_TECHNOLOGY_LIPO,
239
240	.gpio_bat = COLLIE_GPIO_MBAT_ON,
241	.adc_bat = UCB_ADC_INP_AD1,
242	.adc_bat_divider = 155,
243	.bat_max = 4310000,
244	.bat_min = 1551 * 1000000 / 414,
245
246	.gpio_temp = COLLIE_GPIO_TMP_ON,
247	.adc_temp = UCB_ADC_INP_AD0,
248	.adc_temp_divider = 10000,
249	};
250
251	static struct collie_bat collie_bat_bu = {
252	.status = POWER_SUPPLY_STATUS_UNKNOWN,
253	.full_chrg = -1,
254
255	.psy = {
256	.name = "backup-battery",
257	.type = POWER_SUPPLY_TYPE_BATTERY,
258	.properties = collie_bat_bu_props,
259	.num_properties = ARRAY_SIZE(collie_bat_bu_props),
260	.get_property = collie_bat_get_property,
261	.external_power_changed = collie_bat_external_power_changed,
262	},
263
264	.gpio_full = -1,
265	.gpio_charge_on = -1,
266
267	.technology = POWER_SUPPLY_TECHNOLOGY_LiMn,
268
269	.gpio_bat = COLLIE_GPIO_BBAT_ON,
270	.adc_bat = UCB_ADC_INP_AD1,
271	.adc_bat_divider = 155,
272	.bat_max = 3000000,
273	.bat_min = 1900000,
274
275	.gpio_temp = -1,
276	.adc_temp = -1,
277	.adc_temp_divider = -1,
278	};
279
389cd203 AL	280	static struct gpio collie_batt_gpios[] = {
	281	{ COLLIE_GPIO_CO, GPIOF_IN, "main battery full" },
	282	{ COLLIE_GPIO_MAIN_BAT_LOW, GPIOF_IN, "main battery low" },
	283	{ COLLIE_GPIO_CHARGE_ON, GPIOF_OUT_INIT_LOW, "main charge on" },
	284	{ COLLIE_GPIO_MBAT_ON, GPIOF_OUT_INIT_LOW, "main battery" },
	285	{ COLLIE_GPIO_TMP_ON, GPIOF_OUT_INIT_LOW, "main battery temp" },
	286	{ COLLIE_GPIO_BBAT_ON, GPIOF_OUT_INIT_LOW, "backup battery" },
f1fce597 TK	287	};
	288
	289	#ifdef CONFIG_PM
	290	static int collie_bat_suspend(struct ucb1x00_dev *dev, pm_message_t state)
	291	{
	292	/* flush all pending status updates */
43829731	293	flush_work(&bat_work);
f1fce597 TK	294	return 0;
	295	}
	296
	297	static int collie_bat_resume(struct ucb1x00_dev *dev)
	298	{
	299	/* things may have changed while we were away */
	300	schedule_work(&bat_work);
	301	return 0;
	302	}
	303	#else
	304	#define collie_bat_suspend NULL
	305	#define collie_bat_resume NULL
	306	#endif
	307
c8afa640	308	static int collie_bat_probe(struct ucb1x00_dev *dev)
f1fce597 TK	309	{
f1fce597 TK	310	int ret;
f1fce597 TK	311
	312	if (!machine_is_collie())
	313	return -ENODEV;
	314
	315	ucb = dev->ucb;
	316
389cd203 AL	317	ret = gpio_request_array(collie_batt_gpios,
	318	ARRAY_SIZE(collie_batt_gpios));
	319	if (ret)
	320	return ret;
f1fce597 TK	321
	322	mutex_init(&collie_bat_main.work_lock);
	323
	324	INIT_WORK(&bat_work, collie_bat_work);
	325
	326	ret = power_supply_register(&dev->ucb->dev, &collie_bat_main.psy);
	327	if (ret)
	328	goto err_psy_reg_main;
	329	ret = power_supply_register(&dev->ucb->dev, &collie_bat_bu.psy);
	330	if (ret)
	331	goto err_psy_reg_bu;
	332
	333	ret = request_irq(gpio_to_irq(COLLIE_GPIO_CO),
	334	collie_bat_gpio_isr,
	335	IRQF_TRIGGER_RISING \| IRQF_TRIGGER_FALLING,
	336	"main full", &collie_bat_main);
	337	if (!ret) {
	338	schedule_work(&bat_work);
	339	return 0;
	340	}
	341	power_supply_unregister(&collie_bat_bu.psy);
	342	err_psy_reg_bu:
	343	power_supply_unregister(&collie_bat_main.psy);
	344	err_psy_reg_main:
	345
	346	/* see comment in collie_bat_remove */
bc51e7ff	347	cancel_work_sync(&bat_work);
389cd203	348	gpio_free_array(collie_batt_gpios, ARRAY_SIZE(collie_batt_gpios));
f1fce597 TK	349	return ret;
	350	}
	351
415ec69f	352	static void collie_bat_remove(struct ucb1x00_dev *dev)
f1fce597	353	{
f1fce597 TK	354	free_irq(gpio_to_irq(COLLIE_GPIO_CO), &collie_bat_main);
	355
	356	power_supply_unregister(&collie_bat_bu.psy);
	357	power_supply_unregister(&collie_bat_main.psy);
	358
	359	/*
bc51e7ff TH	360	* Now cancel the bat_work. We won't get any more schedules,
	361	* since all sources (isr and external_power_changed) are
	362	* unregistered now.
f1fce597	363	*/
bc51e7ff	364	cancel_work_sync(&bat_work);
389cd203	365	gpio_free_array(collie_batt_gpios, ARRAY_SIZE(collie_batt_gpios));
f1fce597 TK	366	}
	367
	368	static struct ucb1x00_driver collie_bat_driver = {
	369	.add = collie_bat_probe,
28ea73f4	370	.remove = collie_bat_remove,
f1fce597 TK	371	.suspend = collie_bat_suspend,
	372	.resume = collie_bat_resume,
	373	};
	374
	375	static int __init collie_bat_init(void)
	376	{
	377	return ucb1x00_register_driver(&collie_bat_driver);
	378	}
	379
	380	static void __exit collie_bat_exit(void)
	381	{
	382	ucb1x00_unregister_driver(&collie_bat_driver);
	383	}
	384
	385	module_init(collie_bat_init);
	386	module_exit(collie_bat_exit);
	387
	388	MODULE_LICENSE("GPL");
	389	MODULE_AUTHOR("Thomas Kunze");
	390	MODULE_DESCRIPTION("Collie battery driver");