da9030_battery.c 15.7 KB
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592
/*
 * Battery charger driver for Dialog Semiconductor DA9030
 *
 * Copyright (C) 2008 Compulab, Ltd.
 * 	Mike Rapoport <mike@compulab.co.il>
 *
 * 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/slab.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/device.h>
#include <linux/workqueue.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/mfd/da903x.h>

#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/notifier.h>

#define DA9030_FAULT_LOG		0x0a
#define DA9030_FAULT_LOG_OVER_TEMP	(1 << 7)
#define DA9030_FAULT_LOG_VBAT_OVER	(1 << 4)

#define DA9030_CHARGE_CONTROL		0x28
#define DA9030_CHRG_CHARGER_ENABLE	(1 << 7)

#define DA9030_ADC_MAN_CONTROL		0x30
#define DA9030_ADC_TBATREF_ENABLE	(1 << 5)
#define DA9030_ADC_LDO_INT_ENABLE	(1 << 4)

#define DA9030_ADC_AUTO_CONTROL		0x31
#define DA9030_ADC_TBAT_ENABLE		(1 << 5)
#define DA9030_ADC_VBAT_IN_TXON		(1 << 4)
#define DA9030_ADC_VCH_ENABLE		(1 << 3)
#define DA9030_ADC_ICH_ENABLE		(1 << 2)
#define DA9030_ADC_VBAT_ENABLE		(1 << 1)
#define DA9030_ADC_AUTO_SLEEP_ENABLE	(1 << 0)

#define DA9030_VBATMON		0x32
#define DA9030_VBATMONTXON	0x33
#define DA9030_TBATHIGHP	0x34
#define DA9030_TBATHIGHN	0x35
#define DA9030_TBATLOW		0x36

#define DA9030_VBAT_RES		0x41
#define DA9030_VBATMIN_RES	0x42
#define DA9030_VBATMINTXON_RES	0x43
#define DA9030_ICHMAX_RES	0x44
#define DA9030_ICHMIN_RES	0x45
#define DA9030_ICHAVERAGE_RES	0x46
#define DA9030_VCHMAX_RES	0x47
#define DA9030_VCHMIN_RES	0x48
#define DA9030_TBAT_RES		0x49

struct da9030_adc_res {
	uint8_t vbat_res;
	uint8_t vbatmin_res;
	uint8_t vbatmintxon;
	uint8_t ichmax_res;
	uint8_t ichmin_res;
	uint8_t ichaverage_res;
	uint8_t vchmax_res;
	uint8_t vchmin_res;
	uint8_t tbat_res;
	uint8_t adc_in4_res;
	uint8_t adc_in5_res;
};

struct da9030_battery_thresholds {
	int tbat_low;
	int tbat_high;
	int tbat_restart;

	int vbat_low;
	int vbat_crit;
	int vbat_charge_start;
	int vbat_charge_stop;
	int vbat_charge_restart;

	int vcharge_min;
	int vcharge_max;
};

struct da9030_charger {
	struct power_supply psy;

	struct device *master;

	struct da9030_adc_res adc;
	struct delayed_work work;
	unsigned int interval;

	struct power_supply_info *battery_info;

	struct da9030_battery_thresholds thresholds;

	unsigned int charge_milliamp;
	unsigned int charge_millivolt;

	/* charger status */
	bool chdet;
	uint8_t fault;
	int mA;
	int mV;
	bool is_on;

	struct notifier_block nb;

	/* platform callbacks for battery low and critical events */
	void (*battery_low)(void);
	void (*battery_critical)(void);

	struct dentry *debug_file;
};

static inline int da9030_reg_to_mV(int reg)
{
	return ((reg * 2650) >> 8) + 2650;
}

static inline int da9030_millivolt_to_reg(int mV)
{
	return ((mV - 2650) << 8) / 2650;
}

static inline int da9030_reg_to_mA(int reg)
{
	return ((reg * 24000) >> 8) / 15;
}

#ifdef CONFIG_DEBUG_FS
static int bat_debug_show(struct seq_file *s, void *data)
{
	struct da9030_charger *charger = s->private;

	seq_printf(s, "charger is %s\n", charger->is_on ? "on" : "off");
	if (charger->chdet) {
		seq_printf(s, "iset = %dmA, vset = %dmV\n",
			   charger->mA, charger->mV);
	}

	seq_printf(s, "vbat_res = %d (%dmV)\n",
		   charger->adc.vbat_res,
		   da9030_reg_to_mV(charger->adc.vbat_res));
	seq_printf(s, "vbatmin_res = %d (%dmV)\n",
		   charger->adc.vbatmin_res,
		   da9030_reg_to_mV(charger->adc.vbatmin_res));
	seq_printf(s, "vbatmintxon = %d (%dmV)\n",
		   charger->adc.vbatmintxon,
		   da9030_reg_to_mV(charger->adc.vbatmintxon));
	seq_printf(s, "ichmax_res = %d (%dmA)\n",
		   charger->adc.ichmax_res,
		   da9030_reg_to_mV(charger->adc.ichmax_res));
	seq_printf(s, "ichmin_res = %d (%dmA)\n",
		   charger->adc.ichmin_res,
		   da9030_reg_to_mA(charger->adc.ichmin_res));
	seq_printf(s, "ichaverage_res = %d (%dmA)\n",
		   charger->adc.ichaverage_res,
		   da9030_reg_to_mA(charger->adc.ichaverage_res));
	seq_printf(s, "vchmax_res = %d (%dmV)\n",
		   charger->adc.vchmax_res,
		   da9030_reg_to_mA(charger->adc.vchmax_res));
	seq_printf(s, "vchmin_res = %d (%dmV)\n",
		   charger->adc.vchmin_res,
		   da9030_reg_to_mV(charger->adc.vchmin_res));

	return 0;
}

static int debug_open(struct inode *inode, struct file *file)
{
	return single_open(file, bat_debug_show, inode->i_private);
}

static const struct file_operations bat_debug_fops = {
	.open		= debug_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static struct dentry *da9030_bat_create_debugfs(struct da9030_charger *charger)
{
	charger->debug_file = debugfs_create_file("charger", 0666, NULL,
						  charger, &bat_debug_fops);
	return charger->debug_file;
}

static void da9030_bat_remove_debugfs(struct da9030_charger *charger)
{
	debugfs_remove(charger->debug_file);
}
#else
static inline struct dentry *da9030_bat_create_debugfs(struct da9030_charger *charger)
{
	return NULL;
}
static inline void da9030_bat_remove_debugfs(struct da9030_charger *charger)
{
}
#endif

static inline void da9030_read_adc(struct da9030_charger *charger,
				   struct da9030_adc_res *adc)
{
	da903x_reads(charger->master, DA9030_VBAT_RES,
		     sizeof(*adc), (uint8_t *)adc);
}

static void da9030_charger_update_state(struct da9030_charger *charger)
{
	uint8_t val;

	da903x_read(charger->master, DA9030_CHARGE_CONTROL, &val);
	charger->is_on = (val & DA9030_CHRG_CHARGER_ENABLE) ? 1 : 0;
	charger->mA = ((val >> 3) & 0xf) * 100;
	charger->mV = (val & 0x7) * 50 + 4000;

	da9030_read_adc(charger, &charger->adc);
	da903x_read(charger->master, DA9030_FAULT_LOG, &charger->fault);
	charger->chdet = da903x_query_status(charger->master,
						     DA9030_STATUS_CHDET);
}

static void da9030_set_charge(struct da9030_charger *charger, int on)
{
	uint8_t val;

	if (on) {
		val = DA9030_CHRG_CHARGER_ENABLE;
		val |= (charger->charge_milliamp / 100) << 3;
		val |= (charger->charge_millivolt - 4000) / 50;
		charger->is_on = 1;
	} else {
		val = 0;
		charger->is_on = 0;
	}

	da903x_write(charger->master, DA9030_CHARGE_CONTROL, val);

	power_supply_changed(&charger->psy);
}

static void da9030_charger_check_state(struct da9030_charger *charger)
{
	da9030_charger_update_state(charger);

	/* we wake or boot with external power on */
	if (!charger->is_on) {
		if ((charger->chdet) &&
		    (charger->adc.vbat_res <
		     charger->thresholds.vbat_charge_start)) {
			da9030_set_charge(charger, 1);
		}
	} else {
		/* Charger has been pulled out */
		if (!charger->chdet) {
			da9030_set_charge(charger, 0);
			return;
		}

		if (charger->adc.vbat_res >=
		    charger->thresholds.vbat_charge_stop) {
			da9030_set_charge(charger, 0);
			da903x_write(charger->master, DA9030_VBATMON,
				       charger->thresholds.vbat_charge_restart);
		} else if (charger->adc.vbat_res >
			   charger->thresholds.vbat_low) {
			/* we are charging and passed LOW_THRESH,
			   so upate DA9030 VBAT threshold
			 */
			da903x_write(charger->master, DA9030_VBATMON,
				     charger->thresholds.vbat_low);
		}
		if (charger->adc.vchmax_res > charger->thresholds.vcharge_max ||
		    charger->adc.vchmin_res < charger->thresholds.vcharge_min ||
		    /* Tempreture readings are negative */
		    charger->adc.tbat_res < charger->thresholds.tbat_high ||
		    charger->adc.tbat_res > charger->thresholds.tbat_low) {
			/* disable charger */
			da9030_set_charge(charger, 0);
		}
	}
}

static void da9030_charging_monitor(struct work_struct *work)
{
	struct da9030_charger *charger;

	charger = container_of(work, struct da9030_charger, work.work);

	da9030_charger_check_state(charger);

	/* reschedule for the next time */
	schedule_delayed_work(&charger->work, charger->interval);
}

static enum power_supply_property da9030_battery_props[] = {
	POWER_SUPPLY_PROP_MODEL_NAME,
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_HEALTH,
	POWER_SUPPLY_PROP_TECHNOLOGY,
	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CURRENT_AVG,
};

static void da9030_battery_check_status(struct da9030_charger *charger,
				    union power_supply_propval *val)
{
	if (charger->chdet) {
		if (charger->is_on)
			val->intval = POWER_SUPPLY_STATUS_CHARGING;
		else
			val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
	} else {
		val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
	}
}

static void da9030_battery_check_health(struct da9030_charger *charger,
				    union power_supply_propval *val)
{
	if (charger->fault & DA9030_FAULT_LOG_OVER_TEMP)
		val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
	else if (charger->fault & DA9030_FAULT_LOG_VBAT_OVER)
		val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
	else
		val->intval = POWER_SUPPLY_HEALTH_GOOD;
}

static int da9030_battery_get_property(struct power_supply *psy,
				   enum power_supply_property psp,
				   union power_supply_propval *val)
{
	struct da9030_charger *charger;
	charger = container_of(psy, struct da9030_charger, psy);

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
		da9030_battery_check_status(charger, val);
		break;
	case POWER_SUPPLY_PROP_HEALTH:
		da9030_battery_check_health(charger, val);
		break;
	case POWER_SUPPLY_PROP_TECHNOLOGY:
		val->intval = charger->battery_info->technology;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
		val->intval = charger->battery_info->voltage_max_design;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
		val->intval = charger->battery_info->voltage_min_design;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		val->intval = da9030_reg_to_mV(charger->adc.vbat_res) * 1000;
		break;
	case POWER_SUPPLY_PROP_CURRENT_AVG:
		val->intval =
			da9030_reg_to_mA(charger->adc.ichaverage_res) * 1000;
		break;
	case POWER_SUPPLY_PROP_MODEL_NAME:
		val->strval = charger->battery_info->name;
		break;
	default:
		break;
	}

	return 0;
}

static void da9030_battery_vbat_event(struct da9030_charger *charger)
{
	da9030_read_adc(charger, &charger->adc);

	if (charger->is_on)
		return;

	if (charger->adc.vbat_res < charger->thresholds.vbat_low) {
		/* set VBAT threshold for critical */
		da903x_write(charger->master, DA9030_VBATMON,
			     charger->thresholds.vbat_crit);
		if (charger->battery_low)
			charger->battery_low();
	} else if (charger->adc.vbat_res <
		   charger->thresholds.vbat_crit) {
		/* notify the system of battery critical */
		if (charger->battery_critical)
			charger->battery_critical();
	}
}

static int da9030_battery_event(struct notifier_block *nb, unsigned long event,
				void *data)
{
	struct da9030_charger *charger =
		container_of(nb, struct da9030_charger, nb);

	switch (event) {
	case DA9030_EVENT_CHDET:
		cancel_delayed_work_sync(&charger->work);
		schedule_work(&charger->work.work);
		break;
	case DA9030_EVENT_VBATMON:
		da9030_battery_vbat_event(charger);
		break;
	case DA9030_EVENT_CHIOVER:
	case DA9030_EVENT_TBAT:
		da9030_set_charge(charger, 0);
		break;
	}

	return 0;
}

static void da9030_battery_convert_thresholds(struct da9030_charger *charger,
					      struct da9030_battery_info *pdata)
{
	charger->thresholds.tbat_low = pdata->tbat_low;
	charger->thresholds.tbat_high = pdata->tbat_high;
	charger->thresholds.tbat_restart  = pdata->tbat_restart;

	charger->thresholds.vbat_low =
		da9030_millivolt_to_reg(pdata->vbat_low);
	charger->thresholds.vbat_crit =
		da9030_millivolt_to_reg(pdata->vbat_crit);
	charger->thresholds.vbat_charge_start =
		da9030_millivolt_to_reg(pdata->vbat_charge_start);
	charger->thresholds.vbat_charge_stop =
		da9030_millivolt_to_reg(pdata->vbat_charge_stop);
	charger->thresholds.vbat_charge_restart =
		da9030_millivolt_to_reg(pdata->vbat_charge_restart);

	charger->thresholds.vcharge_min =
		da9030_millivolt_to_reg(pdata->vcharge_min);
	charger->thresholds.vcharge_max =
		da9030_millivolt_to_reg(pdata->vcharge_max);
}

static void da9030_battery_setup_psy(struct da9030_charger *charger)
{
	struct power_supply *psy = &charger->psy;
	struct power_supply_info *info = charger->battery_info;

	psy->name = info->name;
	psy->use_for_apm = info->use_for_apm;
	psy->type = POWER_SUPPLY_TYPE_BATTERY;
	psy->get_property = da9030_battery_get_property;

	psy->properties = da9030_battery_props;
	psy->num_properties = ARRAY_SIZE(da9030_battery_props);
};

static int da9030_battery_charger_init(struct da9030_charger *charger)
{
	char v[5];
	int ret;

	v[0] = v[1] = charger->thresholds.vbat_low;
	v[2] = charger->thresholds.tbat_high;
	v[3] = charger->thresholds.tbat_restart;
	v[4] = charger->thresholds.tbat_low;

	ret = da903x_writes(charger->master, DA9030_VBATMON, 5, v);
	if (ret)
		return ret;

	/*
	 * Enable reference voltage supply for ADC from the LDO_INTERNAL
	 * regulator. Must be set before ADC measurements can be made.
	 */
	ret = da903x_write(charger->master, DA9030_ADC_MAN_CONTROL,
			   DA9030_ADC_LDO_INT_ENABLE |
			   DA9030_ADC_TBATREF_ENABLE);
	if (ret)
		return ret;

	/* enable auto ADC measuremnts */
	return da903x_write(charger->master, DA9030_ADC_AUTO_CONTROL,
			    DA9030_ADC_TBAT_ENABLE | DA9030_ADC_VBAT_IN_TXON |
			    DA9030_ADC_VCH_ENABLE | DA9030_ADC_ICH_ENABLE |
			    DA9030_ADC_VBAT_ENABLE |
			    DA9030_ADC_AUTO_SLEEP_ENABLE);
}

static int da9030_battery_probe(struct platform_device *pdev)
{
	struct da9030_charger *charger;
	struct da9030_battery_info *pdata = pdev->dev.platform_data;
	int ret;

	if (pdata == NULL)
		return -EINVAL;

	if (pdata->charge_milliamp >= 1500 ||
	    pdata->charge_millivolt < 4000 ||
	    pdata->charge_millivolt > 4350)
		return -EINVAL;

	charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
	if (charger == NULL)
		return -ENOMEM;

	charger->master = pdev->dev.parent;

	/* 10 seconds between monitor runs unless platform defines other
	   interval */
	charger->interval = msecs_to_jiffies(
		(pdata->batmon_interval ? : 10) * 1000);

	charger->charge_milliamp = pdata->charge_milliamp;
	charger->charge_millivolt = pdata->charge_millivolt;
	charger->battery_info = pdata->battery_info;
	charger->battery_low = pdata->battery_low;
	charger->battery_critical = pdata->battery_critical;

	da9030_battery_convert_thresholds(charger, pdata);

	ret = da9030_battery_charger_init(charger);
	if (ret)
		goto err_charger_init;

	INIT_DELAYED_WORK(&charger->work, da9030_charging_monitor);
	schedule_delayed_work(&charger->work, charger->interval);

	charger->nb.notifier_call = da9030_battery_event;
	ret = da903x_register_notifier(charger->master, &charger->nb,
				       DA9030_EVENT_CHDET |
				       DA9030_EVENT_VBATMON |
				       DA9030_EVENT_CHIOVER |
				       DA9030_EVENT_TBAT);
	if (ret)
		goto err_notifier;

	da9030_battery_setup_psy(charger);
	ret = power_supply_register(&pdev->dev, &charger->psy);
	if (ret)
		goto err_ps_register;

	charger->debug_file = da9030_bat_create_debugfs(charger);
	platform_set_drvdata(pdev, charger);
	return 0;

err_ps_register:
	da903x_unregister_notifier(charger->master, &charger->nb,
				   DA9030_EVENT_CHDET | DA9030_EVENT_VBATMON |
				   DA9030_EVENT_CHIOVER | DA9030_EVENT_TBAT);
err_notifier:
	cancel_delayed_work(&charger->work);

err_charger_init:
	return ret;
}

static int da9030_battery_remove(struct platform_device *dev)
{
	struct da9030_charger *charger = platform_get_drvdata(dev);

	da9030_bat_remove_debugfs(charger);

	da903x_unregister_notifier(charger->master, &charger->nb,
				   DA9030_EVENT_CHDET | DA9030_EVENT_VBATMON |
				   DA9030_EVENT_CHIOVER | DA9030_EVENT_TBAT);
	cancel_delayed_work_sync(&charger->work);
	da9030_set_charge(charger, 0);
	power_supply_unregister(&charger->psy);

	return 0;
}

static struct platform_driver da903x_battery_driver = {
	.driver	= {
		.name	= "da903x-battery",
		.owner	= THIS_MODULE,
	},
	.probe = da9030_battery_probe,
	.remove = da9030_battery_remove,
};

module_platform_driver(da903x_battery_driver);

MODULE_DESCRIPTION("DA9030 battery charger driver");
MODULE_AUTHOR("Mike Rapoport, CompuLab");
MODULE_LICENSE("GPL");