Bootlin logo

Elixir Cross Referencer

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
/*
 * Battery and Power Management code for the Sharp SL-6000x
 *
 * Copyright (c) 2005 Dirk Opfer
 * Copyright (c) 2008 Dmitry Baryshkov
 *
 * 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/wm97xx.h>
#include <linux/delay.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/gpio.h>

#include <asm/mach-types.h>
#include <mach/tosa.h>

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

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

	struct mutex work_lock; /* protects data */

	bool (*is_present)(struct tosa_bat *bat);
	int gpio_full;
	int gpio_charge_off;

	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 tosa_bat tosa_bat_main;
static struct tosa_bat tosa_bat_jacket;

static unsigned long tosa_read_bat(struct tosa_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);
	value = wm97xx_read_aux_adc(bat->psy.dev->parent->driver_data,
			bat->adc_bat);
	gpio_set_value(bat->gpio_bat, 0);
	mutex_unlock(&bat_lock);

	value = value * 1000000 / bat->adc_bat_divider;

	return value;
}

static unsigned long tosa_read_temp(struct tosa_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);
	value = wm97xx_read_aux_adc(bat->psy.dev->parent->driver_data,
			bat->adc_temp);
	gpio_set_value(bat->gpio_temp, 0);
	mutex_unlock(&bat_lock);

	value = value * 10000 / bat->adc_temp_divider;

	return value;
}

static int tosa_bat_get_property(struct power_supply *psy,
			    enum power_supply_property psp,
			    union power_supply_propval *val)
{
	int ret = 0;
	struct tosa_bat *bat = container_of(psy, struct tosa_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 = tosa_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 = tosa_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 bool tosa_jacket_bat_is_present(struct tosa_bat *bat)
{
	return gpio_get_value(TOSA_GPIO_JACKET_DETECT) == 0;
}

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

static irqreturn_t tosa_bat_gpio_isr(int irq, void *data)
{
	pr_info("tosa_bat_gpio irq: %d\n", gpio_get_value(irq_to_gpio(irq)));
	schedule_work(&bat_work);
	return IRQ_HANDLED;
}

static void tosa_bat_update(struct tosa_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_off, 0);
			mdelay(15);
		}

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

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

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

	mutex_unlock(&bat->work_lock);
}

static void tosa_bat_work(struct work_struct *work)
{
	tosa_bat_update(&tosa_bat_main);
	tosa_bat_update(&tosa_bat_jacket);
}


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

static enum power_supply_property tosa_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_PRESENT,
};

static struct tosa_bat tosa_bat_main = {
	.status = POWER_SUPPLY_STATUS_DISCHARGING,
	.full_chrg = -1,
	.psy = {
		.name		= "main-battery",
		.type		= POWER_SUPPLY_TYPE_BATTERY,
		.properties	= tosa_bat_main_props,
		.num_properties	= ARRAY_SIZE(tosa_bat_main_props),
		.get_property	= tosa_bat_get_property,
		.external_power_changed = tosa_bat_external_power_changed,
		.use_for_apm	= 1,
	},

	.gpio_full = TOSA_GPIO_BAT0_CRG,
	.gpio_charge_off = TOSA_GPIO_CHARGE_OFF,

	.technology = POWER_SUPPLY_TECHNOLOGY_LIPO,

	.gpio_bat = TOSA_GPIO_BAT0_V_ON,
	.adc_bat = WM97XX_AUX_ID3,
	.adc_bat_divider = 414,
	.bat_max = 4310000,
	.bat_min = 1551 * 1000000 / 414,

	.gpio_temp = TOSA_GPIO_BAT1_TH_ON,
	.adc_temp = WM97XX_AUX_ID2,
	.adc_temp_divider = 10000,
};

static struct tosa_bat tosa_bat_jacket = {
	.status = POWER_SUPPLY_STATUS_DISCHARGING,
	.full_chrg = -1,
	.psy = {
		.name		= "jacket-battery",
		.type		= POWER_SUPPLY_TYPE_BATTERY,
		.properties	= tosa_bat_main_props,
		.num_properties	= ARRAY_SIZE(tosa_bat_main_props),
		.get_property	= tosa_bat_get_property,
		.external_power_changed = tosa_bat_external_power_changed,
	},

	.is_present = tosa_jacket_bat_is_present,
	.gpio_full = TOSA_GPIO_BAT1_CRG,
	.gpio_charge_off = TOSA_GPIO_CHARGE_OFF_JC,

	.technology = POWER_SUPPLY_TECHNOLOGY_LIPO,

	.gpio_bat = TOSA_GPIO_BAT1_V_ON,
	.adc_bat = WM97XX_AUX_ID3,
	.adc_bat_divider = 414,
	.bat_max = 4310000,
	.bat_min = 1551 * 1000000 / 414,

	.gpio_temp = TOSA_GPIO_BAT0_TH_ON,
	.adc_temp = WM97XX_AUX_ID2,
	.adc_temp_divider = 10000,
};

static struct tosa_bat tosa_bat_bu = {
	.status = POWER_SUPPLY_STATUS_UNKNOWN,
	.full_chrg = -1,

	.psy = {
		.name		= "backup-battery",
		.type		= POWER_SUPPLY_TYPE_BATTERY,
		.properties	= tosa_bat_bu_props,
		.num_properties	= ARRAY_SIZE(tosa_bat_bu_props),
		.get_property	= tosa_bat_get_property,
		.external_power_changed = tosa_bat_external_power_changed,
	},

	.gpio_full = -1,
	.gpio_charge_off = -1,

	.technology = POWER_SUPPLY_TECHNOLOGY_LiMn,

	.gpio_bat = TOSA_GPIO_BU_CHRG_ON,
	.adc_bat = WM97XX_AUX_ID4,
	.adc_bat_divider = 1266,

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

static struct {
	int gpio;
	char *name;
	bool output;
	int value;
} gpios[] = {
	{ TOSA_GPIO_CHARGE_OFF,		"main charge off",	1, 1 },
	{ TOSA_GPIO_CHARGE_OFF_JC,	"jacket charge off",	1, 1 },
	{ TOSA_GPIO_BAT_SW_ON,		"battery switch",	1, 0 },
	{ TOSA_GPIO_BAT0_V_ON,		"main battery",		1, 0 },
	{ TOSA_GPIO_BAT1_V_ON,		"jacket battery",	1, 0 },
	{ TOSA_GPIO_BAT1_TH_ON,		"main battery temp",	1, 0 },
	{ TOSA_GPIO_BAT0_TH_ON,		"jacket battery temp",	1, 0 },
	{ TOSA_GPIO_BU_CHRG_ON,		"backup battery",	1, 0 },
	{ TOSA_GPIO_BAT0_CRG,		"main battery full",	0, 0 },
	{ TOSA_GPIO_BAT1_CRG,		"jacket battery full",	0, 0 },
	{ TOSA_GPIO_BAT0_LOW,		"main battery low",	0, 0 },
	{ TOSA_GPIO_BAT1_LOW,		"jacket battery low",	0, 0 },
	{ TOSA_GPIO_JACKET_DETECT,	"jacket detect",	0, 0 },
};

#ifdef CONFIG_PM
static int tosa_bat_suspend(struct platform_device *dev, pm_message_t state)
{
	/* flush all pending status updates */
	flush_scheduled_work();
	return 0;
}

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

static int __devinit tosa_bat_probe(struct platform_device *dev)
{
	int ret;
	int i;

	if (!machine_is_tosa())
		return -ENODEV;

	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(&tosa_bat_main.work_lock);
	mutex_init(&tosa_bat_jacket.work_lock);

	INIT_WORK(&bat_work, tosa_bat_work);

	ret = power_supply_register(&dev->dev, &tosa_bat_main.psy);
	if (ret)
		goto err_psy_reg_main;
	ret = power_supply_register(&dev->dev, &tosa_bat_jacket.psy);
	if (ret)
		goto err_psy_reg_jacket;
	ret = power_supply_register(&dev->dev, &tosa_bat_bu.psy);
	if (ret)
		goto err_psy_reg_bu;

	ret = request_irq(gpio_to_irq(TOSA_GPIO_BAT0_CRG),
				tosa_bat_gpio_isr,
				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
				"main full", &tosa_bat_main);
	if (ret)
		goto err_req_main;

	ret = request_irq(gpio_to_irq(TOSA_GPIO_BAT1_CRG),
				tosa_bat_gpio_isr,
				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
				"jacket full", &tosa_bat_jacket);
	if (ret)
		goto err_req_jacket;

	ret = request_irq(gpio_to_irq(TOSA_GPIO_JACKET_DETECT),
				tosa_bat_gpio_isr,
				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
				"jacket detect", &tosa_bat_jacket);
	if (!ret) {
		schedule_work(&bat_work);
		return 0;
	}

	free_irq(gpio_to_irq(TOSA_GPIO_BAT1_CRG), &tosa_bat_jacket);
err_req_jacket:
	free_irq(gpio_to_irq(TOSA_GPIO_BAT0_CRG), &tosa_bat_main);
err_req_main:
	power_supply_unregister(&tosa_bat_bu.psy);
err_psy_reg_bu:
	power_supply_unregister(&tosa_bat_jacket.psy);
err_psy_reg_jacket:
	power_supply_unregister(&tosa_bat_main.psy);
err_psy_reg_main:

	/* see comment in tosa_bat_remove */
	flush_scheduled_work();

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

	return ret;
}

static int __devexit tosa_bat_remove(struct platform_device *dev)
{
	int i;

	free_irq(gpio_to_irq(TOSA_GPIO_JACKET_DETECT), &tosa_bat_jacket);
	free_irq(gpio_to_irq(TOSA_GPIO_BAT1_CRG), &tosa_bat_jacket);
	free_irq(gpio_to_irq(TOSA_GPIO_BAT0_CRG), &tosa_bat_main);

	power_supply_unregister(&tosa_bat_bu.psy);
	power_supply_unregister(&tosa_bat_jacket.psy);
	power_supply_unregister(&tosa_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);

	return 0;
}

static struct platform_driver tosa_bat_driver = {
	.driver.name	= "wm97xx-battery",
	.driver.owner	= THIS_MODULE,
	.probe		= tosa_bat_probe,
	.remove		= __devexit_p(tosa_bat_remove),
	.suspend	= tosa_bat_suspend,
	.resume		= tosa_bat_resume,
};

static int __init tosa_bat_init(void)
{
	return platform_driver_register(&tosa_bat_driver);
}

static void __exit tosa_bat_exit(void)
{
	platform_driver_unregister(&tosa_bat_driver);
}

module_init(tosa_bat_init);
module_exit(tosa_bat_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Dmitry Baryshkov");
MODULE_DESCRIPTION("Tosa battery driver");
MODULE_ALIAS("platform:wm97xx-battery");