[net-next-2.6.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: %d\n", gpio_get_value(irq_to_gpio(irq)));
	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 {
	int gpio;
	char *name;
	bool output;
	int value;
} gpios[] = {
	{ COLLIE_GPIO_CO,		"main battery full",	0, 0 },
	{ COLLIE_GPIO_MAIN_BAT_LOW,	"main battery low",	0, 0 },
	{ COLLIE_GPIO_CHARGE_ON,	"main charge on",	1, 0 },
	{ COLLIE_GPIO_MBAT_ON,		"main battery",		1, 0 },
	{ COLLIE_GPIO_TMP_ON,		"main battery temp",	1, 0 },
	{ COLLIE_GPIO_BBAT_ON,		"backup battery",	1, 0 },
};

#ifdef CONFIG_PM
static int collie_bat_suspend(struct ucb1x00_dev *dev, pm_message_t state)
{
	/* flush all pending status updates */
	flush_scheduled_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 __devinit collie_bat_probe(struct ucb1x00_dev *dev)
{
	int ret;
	int i;

	if (!machine_is_collie())
		return -ENODEV;

	ucb = dev->ucb;

	for (i = 0; i < ARRAY_SIZE(gpios); i++) {
		ret = gpio_request(gpios[i].gpio, gpios[i].name);
		if (ret) {
			i--;
			goto err_gpio;
		}

		if (gpios[i].output)
			ret = gpio_direction_output(gpios[i].gpio,
					gpios[i].value);
		else
			ret = gpio_direction_input(gpios[i].gpio);

		if (ret)
			goto err_gpio;
	}

	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 */
	flush_scheduled_work();

	i--;
err_gpio:
	for (; i >= 0; i--)
		gpio_free(gpios[i].gpio);

	return ret;
}

static void __devexit collie_bat_remove(struct ucb1x00_dev *dev)
{
	int i;

	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 flush all pending work.
	 * we won't get any more schedules, since all
	 * sources (isr and external_power_changed)
	 * are unregistered now.
	 */
	flush_scheduled_work();

	for (i = ARRAY_SIZE(gpios) - 1; i >= 0; i--)
		gpio_free(gpios[i].gpio);
}

static struct ucb1x00_driver collie_bat_driver = {
	.add		= collie_bat_probe,
	.remove		= __devexit_p(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	{
149	pr_info("collie_bat_gpio irq: %d\n", gpio_get_value(irq_to_gpio(irq)));
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
280	static struct {
281	int gpio;
282	char *name;
283	bool output;
284	int value;
285	} gpios[] = {
286	{ COLLIE_GPIO_CO, "main battery full", 0, 0 },
287	{ COLLIE_GPIO_MAIN_BAT_LOW, "main battery low", 0, 0 },
288	{ COLLIE_GPIO_CHARGE_ON, "main charge on", 1, 0 },
289	{ COLLIE_GPIO_MBAT_ON, "main battery", 1, 0 },
290	{ COLLIE_GPIO_TMP_ON, "main battery temp", 1, 0 },
291	{ COLLIE_GPIO_BBAT_ON, "backup battery", 1, 0 },
292	};
293
294	#ifdef CONFIG_PM
295	static int collie_bat_suspend(struct ucb1x00_dev *dev, pm_message_t state)
296	{
297	/* flush all pending status updates */
298	flush_scheduled_work();
299	return 0;
300	}
301
302	static int collie_bat_resume(struct ucb1x00_dev *dev)
303	{
304	/* things may have changed while we were away */
305	schedule_work(&bat_work);
306	return 0;
307	}
308	#else
309	#define collie_bat_suspend NULL
310	#define collie_bat_resume NULL
311	#endif
312
313	static int __devinit collie_bat_probe(struct ucb1x00_dev *dev)
314	{
315	int ret;
316	int i;
317
318	if (!machine_is_collie())
319	return -ENODEV;
320
321	ucb = dev->ucb;
322
323	for (i = 0; i < ARRAY_SIZE(gpios); i++) {
324	ret = gpio_request(gpios[i].gpio, gpios[i].name);
325	if (ret) {
326	i--;
327	goto err_gpio;
328	}
329
330	if (gpios[i].output)
331	ret = gpio_direction_output(gpios[i].gpio,
332	gpios[i].value);
333	else
334	ret = gpio_direction_input(gpios[i].gpio);
335
336	if (ret)
337	goto err_gpio;
338	}
339
340	mutex_init(&collie_bat_main.work_lock);
341
342	INIT_WORK(&bat_work, collie_bat_work);
343
344	ret = power_supply_register(&dev->ucb->dev, &collie_bat_main.psy);
345	if (ret)
346	goto err_psy_reg_main;
347	ret = power_supply_register(&dev->ucb->dev, &collie_bat_bu.psy);
348	if (ret)
349	goto err_psy_reg_bu;
350
351	ret = request_irq(gpio_to_irq(COLLIE_GPIO_CO),
352	collie_bat_gpio_isr,
353	IRQF_TRIGGER_RISING \| IRQF_TRIGGER_FALLING,
354	"main full", &collie_bat_main);
355	if (!ret) {
356	schedule_work(&bat_work);
357	return 0;
358	}
359	power_supply_unregister(&collie_bat_bu.psy);
360	err_psy_reg_bu:
361	power_supply_unregister(&collie_bat_main.psy);
362	err_psy_reg_main:
363
364	/* see comment in collie_bat_remove */
365	flush_scheduled_work();
366
367	i--;
368	err_gpio:
369	for (; i >= 0; i--)
370	gpio_free(gpios[i].gpio);
371
372	return ret;
373	}
374
375	static void __devexit collie_bat_remove(struct ucb1x00_dev *dev)
376	{
377	int i;
378
379	free_irq(gpio_to_irq(COLLIE_GPIO_CO), &collie_bat_main);
380
381	power_supply_unregister(&collie_bat_bu.psy);
382	power_supply_unregister(&collie_bat_main.psy);
383
384	/*
385	* now flush all pending work.
386	* we won't get any more schedules, since all
387	* sources (isr and external_power_changed)
388	* are unregistered now.
389	*/
390	flush_scheduled_work();
391
392	for (i = ARRAY_SIZE(gpios) - 1; i >= 0; i--)
393	gpio_free(gpios[i].gpio);
394	}
395
396	static struct ucb1x00_driver collie_bat_driver = {
397	.add = collie_bat_probe,
398	.remove = __devexit_p(collie_bat_remove),
399	.suspend = collie_bat_suspend,
400	.resume = collie_bat_resume,
401	};
402
403	static int __init collie_bat_init(void)
404	{
405	return ucb1x00_register_driver(&collie_bat_driver);
406	}
407
408	static void __exit collie_bat_exit(void)
409	{
410	ucb1x00_unregister_driver(&collie_bat_driver);
411	}
412
413	module_init(collie_bat_init);
414	module_exit(collie_bat_exit);
415
416	MODULE_LICENSE("GPL");
417	MODULE_AUTHOR("Thomas Kunze");
418	MODULE_DESCRIPTION("Collie battery driver");