summaryrefslogtreecommitdiffstats
path: root/drivers/power/supply/s3c_adc_battery.c
blob: 0ffe5cd3abf627fc14516384e7718601604571c8 (plain)
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
/*
 *	iPAQ h1930/h1940/rx1950 battery controller driver
 *	Copyright (c) Vasily Khoruzhick
 *	Based on h1940_battery.c by Arnaud Patard
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive for
 * more details.
 *
 */

#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/leds.h>
#include <linux/gpio.h>
#include <linux/err.h>
#include <linux/timer.h>
#include <linux/jiffies.h>
#include <linux/s3c_adc_battery.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/module.h>

#include <plat/adc.h>

#define BAT_POLL_INTERVAL		10000 /* ms */
#define JITTER_DELAY			500 /* ms */

struct s3c_adc_bat {
	struct power_supply		*psy;
	struct s3c_adc_client		*client;
	struct s3c_adc_bat_pdata	*pdata;
	int				volt_value;
	int				cur_value;
	unsigned int			timestamp;
	int				level;
	int				status;
	int				cable_plugged:1;
};

static struct delayed_work bat_work;

static void s3c_adc_bat_ext_power_changed(struct power_supply *psy)
{
	schedule_delayed_work(&bat_work,
		msecs_to_jiffies(JITTER_DELAY));
}

static int gather_samples(struct s3c_adc_client *client, int num, int channel)
{
	int value, i;

	/* default to 1 if nothing is set */
	if (num < 1)
		num = 1;

	value = 0;
	for (i = 0; i < num; i++)
		value += s3c_adc_read(client, channel);
	value /= num;

	return value;
}

static enum power_supply_property s3c_adc_backup_bat_props[] = {
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_VOLTAGE_MIN,
	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
};

static int s3c_adc_backup_bat_get_property(struct power_supply *psy,
				enum power_supply_property psp,
				union power_supply_propval *val)
{
	struct s3c_adc_bat *bat = power_supply_get_drvdata(psy);

	if (!bat) {
		dev_err(&psy->dev, "%s: no battery infos ?!\n", __func__);
		return -EINVAL;
	}

	if (bat->volt_value < 0 ||
		jiffies_to_msecs(jiffies - bat->timestamp) >
			BAT_POLL_INTERVAL) {
		bat->volt_value = gather_samples(bat->client,
			bat->pdata->backup_volt_samples,
			bat->pdata->backup_volt_channel);
		bat->volt_value *= bat->pdata->backup_volt_mult;
		bat->timestamp = jiffies;
	}

	switch (psp) {
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		val->intval = bat->volt_value;
		return 0;
	case POWER_SUPPLY_PROP_VOLTAGE_MIN:
		val->intval = bat->pdata->backup_volt_min;
		return 0;
	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
		val->intval = bat->pdata->backup_volt_max;
		return 0;
	default:
		return -EINVAL;
	}
}

static const struct power_supply_desc backup_bat_desc = {
	.name		= "backup-battery",
	.type		= POWER_SUPPLY_TYPE_BATTERY,
	.properties	= s3c_adc_backup_bat_props,
	.num_properties = ARRAY_SIZE(s3c_adc_backup_bat_props),
	.get_property	= s3c_adc_backup_bat_get_property,
	.use_for_apm	= 1,
};

static struct s3c_adc_bat backup_bat;

static enum power_supply_property s3c_adc_main_bat_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
	POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN,
	POWER_SUPPLY_PROP_CHARGE_NOW,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CURRENT_NOW,
};

static int calc_full_volt(int volt_val, int cur_val, int impedance)
{
	return volt_val + cur_val * impedance / 1000;
}

static int charge_finished(struct s3c_adc_bat *bat)
{
	return bat->pdata->gpio_inverted ?
		!gpio_get_value(bat->pdata->gpio_charge_finished) :
		gpio_get_value(bat->pdata->gpio_charge_finished);
}

static int s3c_adc_bat_get_property(struct power_supply *psy,
				    enum power_supply_property psp,
				    union power_supply_propval *val)
{
	struct s3c_adc_bat *bat = power_supply_get_drvdata(psy);

	int new_level;
	int full_volt;
	const struct s3c_adc_bat_thresh *lut;
	unsigned int lut_size;

	if (!bat) {
		dev_err(&psy->dev, "no battery infos ?!\n");
		return -EINVAL;
	}

	lut = bat->pdata->lut_noac;
	lut_size = bat->pdata->lut_noac_cnt;

	if (bat->volt_value < 0 || bat->cur_value < 0 ||
		jiffies_to_msecs(jiffies - bat->timestamp) >
			BAT_POLL_INTERVAL) {
		bat->volt_value = gather_samples(bat->client,
			bat->pdata->volt_samples,
			bat->pdata->volt_channel) * bat->pdata->volt_mult;
		bat->cur_value = gather_samples(bat->client,
			bat->pdata->current_samples,
			bat->pdata->current_channel) * bat->pdata->current_mult;
		bat->timestamp = jiffies;
	}

	if (bat->cable_plugged &&
		((bat->pdata->gpio_charge_finished < 0) ||
		!charge_finished(bat))) {
		lut = bat->pdata->lut_acin;
		lut_size = bat->pdata->lut_acin_cnt;
	}

	new_level = 100000;
	full_volt = calc_full_volt((bat->volt_value / 1000),
		(bat->cur_value / 1000), bat->pdata->internal_impedance);

	if (full_volt < calc_full_volt(lut->volt, lut->cur,
		bat->pdata->internal_impedance)) {
		lut_size--;
		while (lut_size--) {
			int lut_volt1;
			int lut_volt2;

			lut_volt1 = calc_full_volt(lut[0].volt, lut[0].cur,
				bat->pdata->internal_impedance);
			lut_volt2 = calc_full_volt(lut[1].volt, lut[1].cur,
				bat->pdata->internal_impedance);
			if (full_volt < lut_volt1 && full_volt >= lut_volt2) {
				new_level = (lut[1].level +
					(lut[0].level - lut[1].level) *
					(full_volt - lut_volt2) /
					(lut_volt1 - lut_volt2)) * 1000;
				break;
			}
			new_level = lut[1].level * 1000;
			lut++;
		}
	}

	bat->level = new_level;

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
		if (bat->pdata->gpio_charge_finished < 0)
			val->intval = bat->level == 100000 ?
				POWER_SUPPLY_STATUS_FULL : bat->status;
		else
			val->intval = bat->status;
		return 0;
	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
		val->intval = 100000;
		return 0;
	case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN:
		val->intval = 0;
		return 0;
	case POWER_SUPPLY_PROP_CHARGE_NOW:
		val->intval = bat->level;
		return 0;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		val->intval = bat->volt_value;
		return 0;
	case POWER_SUPPLY_PROP_CURRENT_NOW:
		val->intval = bat->cur_value;
		return 0;
	default:
		return -EINVAL;
	}
}

static const struct power_supply_desc main_bat_desc = {
	.name			= "main-battery",
	.type			= POWER_SUPPLY_TYPE_BATTERY,
	.properties		= s3c_adc_main_bat_props,
	.num_properties		= ARRAY_SIZE(s3c_adc_main_bat_props),
	.get_property		= s3c_adc_bat_get_property,
	.external_power_changed = s3c_adc_bat_ext_power_changed,
	.use_for_apm		= 1,
};

static struct s3c_adc_bat main_bat;

static void s3c_adc_bat_work(struct work_struct *work)
{
	struct s3c_adc_bat *bat = &main_bat;
	int is_charged;
	int is_plugged;
	static int was_plugged;

	is_plugged = power_supply_am_i_supplied(bat->psy);
	bat->cable_plugged = is_plugged;
	if (is_plugged != was_plugged) {
		was_plugged = is_plugged;
		if (is_plugged) {
			if (bat->pdata->enable_charger)
				bat->pdata->enable_charger();
			bat->status = POWER_SUPPLY_STATUS_CHARGING;
		} else {
			if (bat->pdata->disable_charger)
				bat->pdata->disable_charger();
			bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
		}
	} else {
		if ((bat->pdata->gpio_charge_finished >= 0) && is_plugged) {
			is_charged = charge_finished(&main_bat);
			if (is_charged) {
				if (bat->pdata->disable_charger)
					bat->pdata->disable_charger();
				bat->status = POWER_SUPPLY_STATUS_FULL;
			} else {
				if (bat->pdata->enable_charger)
					bat->pdata->enable_charger();
				bat->status = POWER_SUPPLY_STATUS_CHARGING;
			}
		}
	}

	power_supply_changed(bat->psy);
}

static irqreturn_t s3c_adc_bat_charged(int irq, void *dev_id)
{
	schedule_delayed_work(&bat_work,
		msecs_to_jiffies(JITTER_DELAY));
	return IRQ_HANDLED;
}

static int s3c_adc_bat_probe(struct platform_device *pdev)
{
	struct s3c_adc_client	*client;
	struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
	int ret;

	client = s3c_adc_register(pdev, NULL, NULL, 0);
	if (IS_ERR(client)) {
		dev_err(&pdev->dev, "cannot register adc\n");
		return PTR_ERR(client);
	}

	platform_set_drvdata(pdev, client);

	main_bat.client = client;
	main_bat.pdata = pdata;
	main_bat.volt_value = -1;
	main_bat.cur_value = -1;
	main_bat.cable_plugged = 0;
	main_bat.status = POWER_SUPPLY_STATUS_DISCHARGING;

	main_bat.psy = power_supply_register(&pdev->dev, &main_bat_desc, NULL);
	if (IS_ERR(main_bat.psy)) {
		ret = PTR_ERR(main_bat.psy);
		goto err_reg_main;
	}
	if (pdata->backup_volt_mult) {
		const struct power_supply_config psy_cfg
						= { .drv_data = &backup_bat, };

		backup_bat.client = client;
		backup_bat.pdata = pdev->dev.platform_data;
		backup_bat.volt_value = -1;
		backup_bat.psy = power_supply_register(&pdev->dev,
						       &backup_bat_desc,
						       &psy_cfg);
		if (IS_ERR(backup_bat.psy)) {
			ret = PTR_ERR(backup_bat.psy);
			goto err_reg_backup;
		}
	}

	INIT_DELAYED_WORK(&bat_work, s3c_adc_bat_work);

	if (pdata->gpio_charge_finished >= 0) {
		ret = gpio_request(pdata->gpio_charge_finished, "charged");
		if (ret)
			goto err_gpio;

		ret = request_irq(gpio_to_irq(pdata->gpio_charge_finished),
				s3c_adc_bat_charged,
				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
				"battery charged", NULL);
		if (ret)
			goto err_irq;
	}

	if (pdata->init) {
		ret = pdata->init();
		if (ret)
			goto err_platform;
	}

	dev_info(&pdev->dev, "successfully loaded\n");
	device_init_wakeup(&pdev->dev, 1);

	/* Schedule timer to check current status */
	schedule_delayed_work(&bat_work,
		msecs_to_jiffies(JITTER_DELAY));

	return 0;

err_platform:
	if (pdata->gpio_charge_finished >= 0)
		free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL);
err_irq:
	if (pdata->gpio_charge_finished >= 0)
		gpio_free(pdata->gpio_charge_finished);
err_gpio:
	if (pdata->backup_volt_mult)
		power_supply_unregister(backup_bat.psy);
err_reg_backup:
	power_supply_unregister(main_bat.psy);
err_reg_main:
	return ret;
}

static int s3c_adc_bat_remove(struct platform_device *pdev)
{
	struct s3c_adc_client *client = platform_get_drvdata(pdev);
	struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;

	power_supply_unregister(main_bat.psy);
	if (pdata->backup_volt_mult)
		power_supply_unregister(backup_bat.psy);

	s3c_adc_release(client);

	if (pdata->gpio_charge_finished >= 0) {
		free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL);
		gpio_free(pdata->gpio_charge_finished);
	}

	cancel_delayed_work(&bat_work);

	if (pdata->exit)
		pdata->exit();

	return 0;
}

#ifdef CONFIG_PM
static int s3c_adc_bat_suspend(struct platform_device *pdev,
	pm_message_t state)
{
	struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;

	if (pdata->gpio_charge_finished >= 0) {
		if (device_may_wakeup(&pdev->dev))
			enable_irq_wake(
				gpio_to_irq(pdata->gpio_charge_finished));
		else {
			disable_irq(gpio_to_irq(pdata->gpio_charge_finished));
			main_bat.pdata->disable_charger();
		}
	}

	return 0;
}

static int s3c_adc_bat_resume(struct platform_device *pdev)
{
	struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;

	if (pdata->gpio_charge_finished >= 0) {
		if (device_may_wakeup(&pdev->dev))
			disable_irq_wake(
				gpio_to_irq(pdata->gpio_charge_finished));
		else
			enable_irq(gpio_to_irq(pdata->gpio_charge_finished));
	}

	/* Schedule timer to check current status */
	schedule_delayed_work(&bat_work,
		msecs_to_jiffies(JITTER_DELAY));

	return 0;
}
#else
#define s3c_adc_bat_suspend NULL
#define s3c_adc_bat_resume NULL
#endif

static struct platform_driver s3c_adc_bat_driver = {
	.driver		= {
		.name	= "s3c-adc-battery",
	},
	.probe		= s3c_adc_bat_probe,
	.remove		= s3c_adc_bat_remove,
	.suspend	= s3c_adc_bat_suspend,
	.resume		= s3c_adc_bat_resume,
};

module_platform_driver(s3c_adc_bat_driver);

MODULE_AUTHOR("Vasily Khoruzhick <anarsoul@gmail.com>");
MODULE_DESCRIPTION("iPAQ H1930/H1940/RX1950 battery controller driver");
MODULE_LICENSE("GPL");
OpenPOWER on IntegriCloud