xref: /openbmc/linux/drivers/power/supply/qcom_smbb.c (revision 0838a3bf)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Copyright (c) 2014, Sony Mobile Communications Inc.
3  *
4  * This driver is for the multi-block Switch-Mode Battery Charger and Boost
5  * (SMBB) hardware, found in Qualcomm PM8941 PMICs.  The charger is an
6  * integrated, single-cell lithium-ion battery charger.
7  *
8  * Sub-components:
9  *  - Charger core
10  *  - Buck
11  *  - DC charge-path
12  *  - USB charge-path
13  *  - Battery interface
14  *  - Boost (not implemented)
15  *  - Misc
16  *  - HF-Buck
17  */
18 
19 #include <linux/errno.h>
20 #include <linux/interrupt.h>
21 #include <linux/kernel.h>
22 #include <linux/module.h>
23 #include <linux/mutex.h>
24 #include <linux/of.h>
25 #include <linux/platform_device.h>
26 #include <linux/power_supply.h>
27 #include <linux/regmap.h>
28 #include <linux/slab.h>
29 #include <linux/extcon-provider.h>
30 #include <linux/regulator/driver.h>
31 
32 #define SMBB_CHG_VMAX		0x040
33 #define SMBB_CHG_VSAFE		0x041
34 #define SMBB_CHG_CFG		0x043
35 #define SMBB_CHG_IMAX		0x044
36 #define SMBB_CHG_ISAFE		0x045
37 #define SMBB_CHG_VIN_MIN	0x047
38 #define SMBB_CHG_CTRL		0x049
39 #define CTRL_EN			BIT(7)
40 #define SMBB_CHG_VBAT_WEAK	0x052
41 #define SMBB_CHG_IBAT_TERM_CHG	0x05b
42 #define IBAT_TERM_CHG_IEOC	BIT(7)
43 #define IBAT_TERM_CHG_IEOC_BMS	BIT(7)
44 #define IBAT_TERM_CHG_IEOC_CHG	0
45 #define SMBB_CHG_VBAT_DET	0x05d
46 #define SMBB_CHG_TCHG_MAX_EN	0x060
47 #define TCHG_MAX_EN		BIT(7)
48 #define SMBB_CHG_WDOG_TIME	0x062
49 #define SMBB_CHG_WDOG_EN	0x065
50 #define WDOG_EN			BIT(7)
51 
52 #define SMBB_BUCK_REG_MODE	0x174
53 #define BUCK_REG_MODE		BIT(0)
54 #define BUCK_REG_MODE_VBAT	BIT(0)
55 #define BUCK_REG_MODE_VSYS	0
56 
57 #define SMBB_BAT_PRES_STATUS	0x208
58 #define PRES_STATUS_BAT_PRES	BIT(7)
59 #define SMBB_BAT_TEMP_STATUS	0x209
60 #define TEMP_STATUS_OK		BIT(7)
61 #define TEMP_STATUS_HOT		BIT(6)
62 #define SMBB_BAT_BTC_CTRL	0x249
63 #define BTC_CTRL_COMP_EN	BIT(7)
64 #define BTC_CTRL_COLD_EXT	BIT(1)
65 #define BTC_CTRL_HOT_EXT_N	BIT(0)
66 
67 #define SMBB_USB_IMAX		0x344
68 #define SMBB_USB_OTG_CTL	0x348
69 #define OTG_CTL_EN		BIT(0)
70 #define SMBB_USB_ENUM_TIMER_STOP 0x34e
71 #define ENUM_TIMER_STOP		BIT(0)
72 #define SMBB_USB_SEC_ACCESS	0x3d0
73 #define SEC_ACCESS_MAGIC	0xa5
74 #define SMBB_USB_REV_BST	0x3ed
75 #define REV_BST_CHG_GONE	BIT(7)
76 
77 #define SMBB_DC_IMAX		0x444
78 
79 #define SMBB_MISC_REV2		0x601
80 #define SMBB_MISC_BOOT_DONE	0x642
81 #define BOOT_DONE		BIT(7)
82 
83 #define STATUS_USBIN_VALID	BIT(0) /* USB connection is valid */
84 #define STATUS_DCIN_VALID	BIT(1) /* DC connection is valid */
85 #define STATUS_BAT_HOT		BIT(2) /* Battery temp 1=Hot, 0=Cold */
86 #define STATUS_BAT_OK		BIT(3) /* Battery temp OK */
87 #define STATUS_BAT_PRESENT	BIT(4) /* Battery is present */
88 #define STATUS_CHG_DONE		BIT(5) /* Charge cycle is complete */
89 #define STATUS_CHG_TRKL		BIT(6) /* Trickle charging */
90 #define STATUS_CHG_FAST		BIT(7) /* Fast charging */
91 #define STATUS_CHG_GONE		BIT(8) /* No charger is connected */
92 
93 enum smbb_attr {
94 	ATTR_BAT_ISAFE,
95 	ATTR_BAT_IMAX,
96 	ATTR_USBIN_IMAX,
97 	ATTR_DCIN_IMAX,
98 	ATTR_BAT_VSAFE,
99 	ATTR_BAT_VMAX,
100 	ATTR_BAT_VMIN,
101 	ATTR_CHG_VDET,
102 	ATTR_VIN_MIN,
103 	_ATTR_CNT,
104 };
105 
106 struct smbb_charger {
107 	unsigned int revision;
108 	unsigned int addr;
109 	struct device *dev;
110 	struct extcon_dev *edev;
111 
112 	bool dc_disabled;
113 	bool jeita_ext_temp;
114 	unsigned long status;
115 	struct mutex statlock;
116 
117 	unsigned int attr[_ATTR_CNT];
118 
119 	struct power_supply *usb_psy;
120 	struct power_supply *dc_psy;
121 	struct power_supply *bat_psy;
122 	struct regmap *regmap;
123 
124 	struct regulator_desc otg_rdesc;
125 	struct regulator_dev *otg_reg;
126 };
127 
128 static const unsigned int smbb_usb_extcon_cable[] = {
129 	EXTCON_USB,
130 	EXTCON_NONE,
131 };
132 
smbb_vbat_weak_fn(unsigned int index)133 static int smbb_vbat_weak_fn(unsigned int index)
134 {
135 	return 2100000 + index * 100000;
136 }
137 
smbb_vin_fn(unsigned int index)138 static int smbb_vin_fn(unsigned int index)
139 {
140 	if (index > 42)
141 		return 5600000 + (index - 43) * 200000;
142 	return 3400000 + index * 50000;
143 }
144 
smbb_vmax_fn(unsigned int index)145 static int smbb_vmax_fn(unsigned int index)
146 {
147 	return 3240000 + index * 10000;
148 }
149 
smbb_vbat_det_fn(unsigned int index)150 static int smbb_vbat_det_fn(unsigned int index)
151 {
152 	return 3240000 + index * 20000;
153 }
154 
smbb_imax_fn(unsigned int index)155 static int smbb_imax_fn(unsigned int index)
156 {
157 	if (index < 2)
158 		return 100000 + index * 50000;
159 	return index * 100000;
160 }
161 
smbb_bat_imax_fn(unsigned int index)162 static int smbb_bat_imax_fn(unsigned int index)
163 {
164 	return index * 50000;
165 }
166 
smbb_hw_lookup(unsigned int val,int (* fn)(unsigned int))167 static unsigned int smbb_hw_lookup(unsigned int val, int (*fn)(unsigned int))
168 {
169 	unsigned int widx;
170 	unsigned int sel;
171 
172 	for (widx = sel = 0; (*fn)(widx) <= val; ++widx)
173 		sel = widx;
174 
175 	return sel;
176 }
177 
178 static const struct smbb_charger_attr {
179 	const char *name;
180 	unsigned int reg;
181 	unsigned int safe_reg;
182 	unsigned int max;
183 	unsigned int min;
184 	unsigned int fail_ok;
185 	int (*hw_fn)(unsigned int);
186 } smbb_charger_attrs[] = {
187 	[ATTR_BAT_ISAFE] = {
188 		.name = "qcom,fast-charge-safe-current",
189 		.reg = SMBB_CHG_ISAFE,
190 		.max = 3000000,
191 		.min = 200000,
192 		.hw_fn = smbb_bat_imax_fn,
193 		.fail_ok = 1,
194 	},
195 	[ATTR_BAT_IMAX] = {
196 		.name = "qcom,fast-charge-current-limit",
197 		.reg = SMBB_CHG_IMAX,
198 		.safe_reg = SMBB_CHG_ISAFE,
199 		.max = 3000000,
200 		.min = 200000,
201 		.hw_fn = smbb_bat_imax_fn,
202 	},
203 	[ATTR_DCIN_IMAX] = {
204 		.name = "qcom,dc-current-limit",
205 		.reg = SMBB_DC_IMAX,
206 		.max = 2500000,
207 		.min = 100000,
208 		.hw_fn = smbb_imax_fn,
209 	},
210 	[ATTR_BAT_VSAFE] = {
211 		.name = "qcom,fast-charge-safe-voltage",
212 		.reg = SMBB_CHG_VSAFE,
213 		.max = 5000000,
214 		.min = 3240000,
215 		.hw_fn = smbb_vmax_fn,
216 		.fail_ok = 1,
217 	},
218 	[ATTR_BAT_VMAX] = {
219 		.name = "qcom,fast-charge-high-threshold-voltage",
220 		.reg = SMBB_CHG_VMAX,
221 		.safe_reg = SMBB_CHG_VSAFE,
222 		.max = 5000000,
223 		.min = 3240000,
224 		.hw_fn = smbb_vmax_fn,
225 	},
226 	[ATTR_BAT_VMIN] = {
227 		.name = "qcom,fast-charge-low-threshold-voltage",
228 		.reg = SMBB_CHG_VBAT_WEAK,
229 		.max = 3600000,
230 		.min = 2100000,
231 		.hw_fn = smbb_vbat_weak_fn,
232 	},
233 	[ATTR_CHG_VDET] = {
234 		.name = "qcom,auto-recharge-threshold-voltage",
235 		.reg = SMBB_CHG_VBAT_DET,
236 		.max = 5000000,
237 		.min = 3240000,
238 		.hw_fn = smbb_vbat_det_fn,
239 	},
240 	[ATTR_VIN_MIN] = {
241 		.name = "qcom,minimum-input-voltage",
242 		.reg = SMBB_CHG_VIN_MIN,
243 		.max = 9600000,
244 		.min = 4200000,
245 		.hw_fn = smbb_vin_fn,
246 	},
247 	[ATTR_USBIN_IMAX] = {
248 		.name = "usb-charge-current-limit",
249 		.reg = SMBB_USB_IMAX,
250 		.max = 2500000,
251 		.min = 100000,
252 		.hw_fn = smbb_imax_fn,
253 	},
254 };
255 
smbb_charger_attr_write(struct smbb_charger * chg,enum smbb_attr which,unsigned int val)256 static int smbb_charger_attr_write(struct smbb_charger *chg,
257 		enum smbb_attr which, unsigned int val)
258 {
259 	const struct smbb_charger_attr *prop;
260 	unsigned int wval;
261 	unsigned int out;
262 	int rc;
263 
264 	prop = &smbb_charger_attrs[which];
265 
266 	if (val > prop->max || val < prop->min) {
267 		dev_err(chg->dev, "value out of range for %s [%u:%u]\n",
268 			prop->name, prop->min, prop->max);
269 		return -EINVAL;
270 	}
271 
272 	if (prop->safe_reg) {
273 		rc = regmap_read(chg->regmap,
274 				chg->addr + prop->safe_reg, &wval);
275 		if (rc) {
276 			dev_err(chg->dev,
277 				"unable to read safe value for '%s'\n",
278 				prop->name);
279 			return rc;
280 		}
281 
282 		wval = prop->hw_fn(wval);
283 
284 		if (val > wval) {
285 			dev_warn(chg->dev,
286 				"%s above safe value, clamping at %u\n",
287 				prop->name, wval);
288 			val = wval;
289 		}
290 	}
291 
292 	wval = smbb_hw_lookup(val, prop->hw_fn);
293 
294 	rc = regmap_write(chg->regmap, chg->addr + prop->reg, wval);
295 	if (rc) {
296 		dev_err(chg->dev, "unable to update %s", prop->name);
297 		return rc;
298 	}
299 	out = prop->hw_fn(wval);
300 	if (out != val) {
301 		dev_warn(chg->dev,
302 			"%s inaccurate, rounded to %u\n",
303 			prop->name, out);
304 	}
305 
306 	dev_dbg(chg->dev, "%s <= %d\n", prop->name, out);
307 
308 	chg->attr[which] = out;
309 
310 	return 0;
311 }
312 
smbb_charger_attr_read(struct smbb_charger * chg,enum smbb_attr which)313 static int smbb_charger_attr_read(struct smbb_charger *chg,
314 		enum smbb_attr which)
315 {
316 	const struct smbb_charger_attr *prop;
317 	unsigned int val;
318 	int rc;
319 
320 	prop = &smbb_charger_attrs[which];
321 
322 	rc = regmap_read(chg->regmap, chg->addr + prop->reg, &val);
323 	if (rc) {
324 		dev_err(chg->dev, "failed to read %s\n", prop->name);
325 		return rc;
326 	}
327 	val = prop->hw_fn(val);
328 	dev_dbg(chg->dev, "%s => %d\n", prop->name, val);
329 
330 	chg->attr[which] = val;
331 
332 	return 0;
333 }
334 
smbb_charger_attr_parse(struct smbb_charger * chg,enum smbb_attr which)335 static int smbb_charger_attr_parse(struct smbb_charger *chg,
336 		enum smbb_attr which)
337 {
338 	const struct smbb_charger_attr *prop;
339 	unsigned int val;
340 	int rc;
341 
342 	prop = &smbb_charger_attrs[which];
343 
344 	rc = of_property_read_u32(chg->dev->of_node, prop->name, &val);
345 	if (rc == 0) {
346 		rc = smbb_charger_attr_write(chg, which, val);
347 		if (!rc || !prop->fail_ok)
348 			return rc;
349 	}
350 	return smbb_charger_attr_read(chg, which);
351 }
352 
smbb_set_line_flag(struct smbb_charger * chg,int irq,int flag)353 static void smbb_set_line_flag(struct smbb_charger *chg, int irq, int flag)
354 {
355 	bool state;
356 	int ret;
357 
358 	ret = irq_get_irqchip_state(irq, IRQCHIP_STATE_LINE_LEVEL, &state);
359 	if (ret < 0) {
360 		dev_err(chg->dev, "failed to read irq line\n");
361 		return;
362 	}
363 
364 	mutex_lock(&chg->statlock);
365 	if (state)
366 		chg->status |= flag;
367 	else
368 		chg->status &= ~flag;
369 	mutex_unlock(&chg->statlock);
370 
371 	dev_dbg(chg->dev, "status = %03lx\n", chg->status);
372 }
373 
smbb_usb_valid_handler(int irq,void * _data)374 static irqreturn_t smbb_usb_valid_handler(int irq, void *_data)
375 {
376 	struct smbb_charger *chg = _data;
377 
378 	smbb_set_line_flag(chg, irq, STATUS_USBIN_VALID);
379 	extcon_set_state_sync(chg->edev, EXTCON_USB,
380 				chg->status & STATUS_USBIN_VALID);
381 	power_supply_changed(chg->usb_psy);
382 
383 	return IRQ_HANDLED;
384 }
385 
smbb_dc_valid_handler(int irq,void * _data)386 static irqreturn_t smbb_dc_valid_handler(int irq, void *_data)
387 {
388 	struct smbb_charger *chg = _data;
389 
390 	smbb_set_line_flag(chg, irq, STATUS_DCIN_VALID);
391 	if (!chg->dc_disabled)
392 		power_supply_changed(chg->dc_psy);
393 
394 	return IRQ_HANDLED;
395 }
396 
smbb_bat_temp_handler(int irq,void * _data)397 static irqreturn_t smbb_bat_temp_handler(int irq, void *_data)
398 {
399 	struct smbb_charger *chg = _data;
400 	unsigned int val;
401 	int rc;
402 
403 	rc = regmap_read(chg->regmap, chg->addr + SMBB_BAT_TEMP_STATUS, &val);
404 	if (rc)
405 		return IRQ_HANDLED;
406 
407 	mutex_lock(&chg->statlock);
408 	if (val & TEMP_STATUS_OK) {
409 		chg->status |= STATUS_BAT_OK;
410 	} else {
411 		chg->status &= ~STATUS_BAT_OK;
412 		if (val & TEMP_STATUS_HOT)
413 			chg->status |= STATUS_BAT_HOT;
414 	}
415 	mutex_unlock(&chg->statlock);
416 
417 	power_supply_changed(chg->bat_psy);
418 	return IRQ_HANDLED;
419 }
420 
smbb_bat_present_handler(int irq,void * _data)421 static irqreturn_t smbb_bat_present_handler(int irq, void *_data)
422 {
423 	struct smbb_charger *chg = _data;
424 
425 	smbb_set_line_flag(chg, irq, STATUS_BAT_PRESENT);
426 	power_supply_changed(chg->bat_psy);
427 
428 	return IRQ_HANDLED;
429 }
430 
smbb_chg_done_handler(int irq,void * _data)431 static irqreturn_t smbb_chg_done_handler(int irq, void *_data)
432 {
433 	struct smbb_charger *chg = _data;
434 
435 	smbb_set_line_flag(chg, irq, STATUS_CHG_DONE);
436 	power_supply_changed(chg->bat_psy);
437 
438 	return IRQ_HANDLED;
439 }
440 
smbb_chg_gone_handler(int irq,void * _data)441 static irqreturn_t smbb_chg_gone_handler(int irq, void *_data)
442 {
443 	struct smbb_charger *chg = _data;
444 
445 	smbb_set_line_flag(chg, irq, STATUS_CHG_GONE);
446 	power_supply_changed(chg->bat_psy);
447 	power_supply_changed(chg->usb_psy);
448 	if (!chg->dc_disabled)
449 		power_supply_changed(chg->dc_psy);
450 
451 	return IRQ_HANDLED;
452 }
453 
smbb_chg_fast_handler(int irq,void * _data)454 static irqreturn_t smbb_chg_fast_handler(int irq, void *_data)
455 {
456 	struct smbb_charger *chg = _data;
457 
458 	smbb_set_line_flag(chg, irq, STATUS_CHG_FAST);
459 	power_supply_changed(chg->bat_psy);
460 
461 	return IRQ_HANDLED;
462 }
463 
smbb_chg_trkl_handler(int irq,void * _data)464 static irqreturn_t smbb_chg_trkl_handler(int irq, void *_data)
465 {
466 	struct smbb_charger *chg = _data;
467 
468 	smbb_set_line_flag(chg, irq, STATUS_CHG_TRKL);
469 	power_supply_changed(chg->bat_psy);
470 
471 	return IRQ_HANDLED;
472 }
473 
474 static const struct smbb_irq {
475 	const char *name;
476 	irqreturn_t (*handler)(int, void *);
477 } smbb_charger_irqs[] = {
478 	{ "chg-done", smbb_chg_done_handler },
479 	{ "chg-fast", smbb_chg_fast_handler },
480 	{ "chg-trkl", smbb_chg_trkl_handler },
481 	{ "bat-temp-ok", smbb_bat_temp_handler },
482 	{ "bat-present", smbb_bat_present_handler },
483 	{ "chg-gone", smbb_chg_gone_handler },
484 	{ "usb-valid", smbb_usb_valid_handler },
485 	{ "dc-valid", smbb_dc_valid_handler },
486 };
487 
smbb_usbin_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)488 static int smbb_usbin_get_property(struct power_supply *psy,
489 		enum power_supply_property psp,
490 		union power_supply_propval *val)
491 {
492 	struct smbb_charger *chg = power_supply_get_drvdata(psy);
493 	int rc = 0;
494 
495 	switch (psp) {
496 	case POWER_SUPPLY_PROP_ONLINE:
497 		mutex_lock(&chg->statlock);
498 		val->intval = !(chg->status & STATUS_CHG_GONE) &&
499 				(chg->status & STATUS_USBIN_VALID);
500 		mutex_unlock(&chg->statlock);
501 		break;
502 	case POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT:
503 		val->intval = chg->attr[ATTR_USBIN_IMAX];
504 		break;
505 	case POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT_MAX:
506 		val->intval = 2500000;
507 		break;
508 	default:
509 		rc = -EINVAL;
510 		break;
511 	}
512 
513 	return rc;
514 }
515 
smbb_usbin_set_property(struct power_supply * psy,enum power_supply_property psp,const union power_supply_propval * val)516 static int smbb_usbin_set_property(struct power_supply *psy,
517 		enum power_supply_property psp,
518 		const union power_supply_propval *val)
519 {
520 	struct smbb_charger *chg = power_supply_get_drvdata(psy);
521 	int rc;
522 
523 	switch (psp) {
524 	case POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT:
525 		rc = smbb_charger_attr_write(chg, ATTR_USBIN_IMAX,
526 				val->intval);
527 		break;
528 	default:
529 		rc = -EINVAL;
530 		break;
531 	}
532 
533 	return rc;
534 }
535 
smbb_dcin_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)536 static int smbb_dcin_get_property(struct power_supply *psy,
537 		enum power_supply_property psp,
538 		union power_supply_propval *val)
539 {
540 	struct smbb_charger *chg = power_supply_get_drvdata(psy);
541 	int rc = 0;
542 
543 	switch (psp) {
544 	case POWER_SUPPLY_PROP_ONLINE:
545 		mutex_lock(&chg->statlock);
546 		val->intval = !(chg->status & STATUS_CHG_GONE) &&
547 				(chg->status & STATUS_DCIN_VALID);
548 		mutex_unlock(&chg->statlock);
549 		break;
550 	case POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT:
551 		val->intval = chg->attr[ATTR_DCIN_IMAX];
552 		break;
553 	case POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT_MAX:
554 		val->intval = 2500000;
555 		break;
556 	default:
557 		rc = -EINVAL;
558 		break;
559 	}
560 
561 	return rc;
562 }
563 
smbb_dcin_set_property(struct power_supply * psy,enum power_supply_property psp,const union power_supply_propval * val)564 static int smbb_dcin_set_property(struct power_supply *psy,
565 		enum power_supply_property psp,
566 		const union power_supply_propval *val)
567 {
568 	struct smbb_charger *chg = power_supply_get_drvdata(psy);
569 	int rc;
570 
571 	switch (psp) {
572 	case POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT:
573 		rc = smbb_charger_attr_write(chg, ATTR_DCIN_IMAX,
574 				val->intval);
575 		break;
576 	default:
577 		rc = -EINVAL;
578 		break;
579 	}
580 
581 	return rc;
582 }
583 
smbb_charger_writable_property(struct power_supply * psy,enum power_supply_property psp)584 static int smbb_charger_writable_property(struct power_supply *psy,
585 		enum power_supply_property psp)
586 {
587 	return psp == POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT;
588 }
589 
smbb_battery_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)590 static int smbb_battery_get_property(struct power_supply *psy,
591 		enum power_supply_property psp,
592 		union power_supply_propval *val)
593 {
594 	struct smbb_charger *chg = power_supply_get_drvdata(psy);
595 	unsigned long status;
596 	int rc = 0;
597 
598 	mutex_lock(&chg->statlock);
599 	status = chg->status;
600 	mutex_unlock(&chg->statlock);
601 
602 	switch (psp) {
603 	case POWER_SUPPLY_PROP_STATUS:
604 		if (status & STATUS_CHG_GONE)
605 			val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
606 		else if (!(status & (STATUS_DCIN_VALID | STATUS_USBIN_VALID)))
607 			val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
608 		else if (status & STATUS_CHG_DONE)
609 			val->intval = POWER_SUPPLY_STATUS_FULL;
610 		else if (!(status & STATUS_BAT_OK))
611 			val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
612 		else if (status & (STATUS_CHG_FAST | STATUS_CHG_TRKL))
613 			val->intval = POWER_SUPPLY_STATUS_CHARGING;
614 		else /* everything is ok for charging, but we are not... */
615 			val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
616 		break;
617 	case POWER_SUPPLY_PROP_HEALTH:
618 		if (status & STATUS_BAT_OK)
619 			val->intval = POWER_SUPPLY_HEALTH_GOOD;
620 		else if (status & STATUS_BAT_HOT)
621 			val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
622 		else
623 			val->intval = POWER_SUPPLY_HEALTH_COLD;
624 		break;
625 	case POWER_SUPPLY_PROP_CHARGE_TYPE:
626 		if (status & STATUS_CHG_FAST)
627 			val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
628 		else if (status & STATUS_CHG_TRKL)
629 			val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
630 		else
631 			val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
632 		break;
633 	case POWER_SUPPLY_PROP_PRESENT:
634 		val->intval = !!(status & STATUS_BAT_PRESENT);
635 		break;
636 	case POWER_SUPPLY_PROP_CURRENT_MAX:
637 		val->intval = chg->attr[ATTR_BAT_IMAX];
638 		break;
639 	case POWER_SUPPLY_PROP_VOLTAGE_MAX:
640 		val->intval = chg->attr[ATTR_BAT_VMAX];
641 		break;
642 	case POWER_SUPPLY_PROP_TECHNOLOGY:
643 		/* this charger is a single-cell lithium-ion battery charger
644 		* only.  If you hook up some other technology, there will be
645 		* fireworks.
646 		*/
647 		val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
648 		break;
649 	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
650 		val->intval = 3000000; /* single-cell li-ion low end */
651 		break;
652 	default:
653 		rc = -EINVAL;
654 		break;
655 	}
656 
657 	return rc;
658 }
659 
smbb_battery_set_property(struct power_supply * psy,enum power_supply_property psp,const union power_supply_propval * val)660 static int smbb_battery_set_property(struct power_supply *psy,
661 		enum power_supply_property psp,
662 		const union power_supply_propval *val)
663 {
664 	struct smbb_charger *chg = power_supply_get_drvdata(psy);
665 	int rc;
666 
667 	switch (psp) {
668 	case POWER_SUPPLY_PROP_CURRENT_MAX:
669 		rc = smbb_charger_attr_write(chg, ATTR_BAT_IMAX, val->intval);
670 		break;
671 	case POWER_SUPPLY_PROP_VOLTAGE_MAX:
672 		rc = smbb_charger_attr_write(chg, ATTR_BAT_VMAX, val->intval);
673 		break;
674 	default:
675 		rc = -EINVAL;
676 		break;
677 	}
678 
679 	return rc;
680 }
681 
smbb_battery_writable_property(struct power_supply * psy,enum power_supply_property psp)682 static int smbb_battery_writable_property(struct power_supply *psy,
683 		enum power_supply_property psp)
684 {
685 	switch (psp) {
686 	case POWER_SUPPLY_PROP_CURRENT_MAX:
687 	case POWER_SUPPLY_PROP_VOLTAGE_MAX:
688 		return 1;
689 	default:
690 		return 0;
691 	}
692 }
693 
694 static enum power_supply_property smbb_charger_properties[] = {
695 	POWER_SUPPLY_PROP_ONLINE,
696 	POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT,
697 	POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT_MAX,
698 };
699 
700 static enum power_supply_property smbb_battery_properties[] = {
701 	POWER_SUPPLY_PROP_STATUS,
702 	POWER_SUPPLY_PROP_HEALTH,
703 	POWER_SUPPLY_PROP_PRESENT,
704 	POWER_SUPPLY_PROP_CHARGE_TYPE,
705 	POWER_SUPPLY_PROP_CURRENT_MAX,
706 	POWER_SUPPLY_PROP_VOLTAGE_MAX,
707 	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
708 	POWER_SUPPLY_PROP_TECHNOLOGY,
709 };
710 
711 static const struct reg_off_mask_default {
712 	unsigned int offset;
713 	unsigned int mask;
714 	unsigned int value;
715 	unsigned int rev_mask;
716 } smbb_charger_setup[] = {
717 	/* The bootloader is supposed to set this... make sure anyway. */
718 	{ SMBB_MISC_BOOT_DONE, BOOT_DONE, BOOT_DONE },
719 
720 	/* Disable software timer */
721 	{ SMBB_CHG_TCHG_MAX_EN, TCHG_MAX_EN, 0 },
722 
723 	/* Clear and disable watchdog */
724 	{ SMBB_CHG_WDOG_TIME, 0xff, 160 },
725 	{ SMBB_CHG_WDOG_EN, WDOG_EN, 0 },
726 
727 	/* Use charger based EoC detection */
728 	{ SMBB_CHG_IBAT_TERM_CHG, IBAT_TERM_CHG_IEOC, IBAT_TERM_CHG_IEOC_CHG },
729 
730 	/* Disable GSM PA load adjustment.
731 	* The PA signal is incorrectly connected on v2.
732 	*/
733 	{ SMBB_CHG_CFG, 0xff, 0x00, BIT(3) },
734 
735 	/* Use VBAT (not VSYS) to compensate for IR drop during fast charging */
736 	{ SMBB_BUCK_REG_MODE, BUCK_REG_MODE, BUCK_REG_MODE_VBAT },
737 
738 	/* Enable battery temperature comparators */
739 	{ SMBB_BAT_BTC_CTRL, BTC_CTRL_COMP_EN, BTC_CTRL_COMP_EN },
740 
741 	/* Stop USB enumeration timer */
742 	{ SMBB_USB_ENUM_TIMER_STOP, ENUM_TIMER_STOP, ENUM_TIMER_STOP },
743 
744 #if 0 /* FIXME supposedly only to disable hardware ARB termination */
745 	{ SMBB_USB_SEC_ACCESS, SEC_ACCESS_MAGIC },
746 	{ SMBB_USB_REV_BST, 0xff, REV_BST_CHG_GONE },
747 #endif
748 
749 	/* Stop USB enumeration timer, again */
750 	{ SMBB_USB_ENUM_TIMER_STOP, ENUM_TIMER_STOP, ENUM_TIMER_STOP },
751 
752 	/* Enable charging */
753 	{ SMBB_CHG_CTRL, CTRL_EN, CTRL_EN },
754 };
755 
756 static char *smbb_bif[] = { "smbb-bif" };
757 
758 static const struct power_supply_desc bat_psy_desc = {
759 	.name = "smbb-bif",
760 	.type = POWER_SUPPLY_TYPE_BATTERY,
761 	.properties = smbb_battery_properties,
762 	.num_properties = ARRAY_SIZE(smbb_battery_properties),
763 	.get_property = smbb_battery_get_property,
764 	.set_property = smbb_battery_set_property,
765 	.property_is_writeable = smbb_battery_writable_property,
766 };
767 
768 static const struct power_supply_desc usb_psy_desc = {
769 	.name = "smbb-usbin",
770 	.type = POWER_SUPPLY_TYPE_USB,
771 	.properties = smbb_charger_properties,
772 	.num_properties = ARRAY_SIZE(smbb_charger_properties),
773 	.get_property = smbb_usbin_get_property,
774 	.set_property = smbb_usbin_set_property,
775 	.property_is_writeable = smbb_charger_writable_property,
776 };
777 
778 static const struct power_supply_desc dc_psy_desc = {
779 	.name = "smbb-dcin",
780 	.type = POWER_SUPPLY_TYPE_MAINS,
781 	.properties = smbb_charger_properties,
782 	.num_properties = ARRAY_SIZE(smbb_charger_properties),
783 	.get_property = smbb_dcin_get_property,
784 	.set_property = smbb_dcin_set_property,
785 	.property_is_writeable = smbb_charger_writable_property,
786 };
787 
smbb_chg_otg_enable(struct regulator_dev * rdev)788 static int smbb_chg_otg_enable(struct regulator_dev *rdev)
789 {
790 	struct smbb_charger *chg = rdev_get_drvdata(rdev);
791 	int rc;
792 
793 	rc = regmap_update_bits(chg->regmap, chg->addr + SMBB_USB_OTG_CTL,
794 				OTG_CTL_EN, OTG_CTL_EN);
795 	if (rc)
796 		dev_err(chg->dev, "failed to update OTG_CTL\n");
797 	return rc;
798 }
799 
smbb_chg_otg_disable(struct regulator_dev * rdev)800 static int smbb_chg_otg_disable(struct regulator_dev *rdev)
801 {
802 	struct smbb_charger *chg = rdev_get_drvdata(rdev);
803 	int rc;
804 
805 	rc = regmap_update_bits(chg->regmap, chg->addr + SMBB_USB_OTG_CTL,
806 				OTG_CTL_EN, 0);
807 	if (rc)
808 		dev_err(chg->dev, "failed to update OTG_CTL\n");
809 	return rc;
810 }
811 
smbb_chg_otg_is_enabled(struct regulator_dev * rdev)812 static int smbb_chg_otg_is_enabled(struct regulator_dev *rdev)
813 {
814 	struct smbb_charger *chg = rdev_get_drvdata(rdev);
815 	unsigned int value = 0;
816 	int rc;
817 
818 	rc = regmap_read(chg->regmap, chg->addr + SMBB_USB_OTG_CTL, &value);
819 	if (rc)
820 		dev_err(chg->dev, "failed to read OTG_CTL\n");
821 
822 	return !!(value & OTG_CTL_EN);
823 }
824 
825 static const struct regulator_ops smbb_chg_otg_ops = {
826 	.enable = smbb_chg_otg_enable,
827 	.disable = smbb_chg_otg_disable,
828 	.is_enabled = smbb_chg_otg_is_enabled,
829 };
830 
smbb_charger_probe(struct platform_device * pdev)831 static int smbb_charger_probe(struct platform_device *pdev)
832 {
833 	struct power_supply_config bat_cfg = {};
834 	struct power_supply_config usb_cfg = {};
835 	struct power_supply_config dc_cfg = {};
836 	struct smbb_charger *chg;
837 	struct regulator_config config = { };
838 	int rc, i;
839 
840 	chg = devm_kzalloc(&pdev->dev, sizeof(*chg), GFP_KERNEL);
841 	if (!chg)
842 		return -ENOMEM;
843 
844 	chg->dev = &pdev->dev;
845 	mutex_init(&chg->statlock);
846 
847 	chg->regmap = dev_get_regmap(pdev->dev.parent, NULL);
848 	if (!chg->regmap) {
849 		dev_err(&pdev->dev, "failed to locate regmap\n");
850 		return -ENODEV;
851 	}
852 
853 	rc = of_property_read_u32(pdev->dev.of_node, "reg", &chg->addr);
854 	if (rc) {
855 		dev_err(&pdev->dev, "missing or invalid 'reg' property\n");
856 		return rc;
857 	}
858 
859 	rc = regmap_read(chg->regmap, chg->addr + SMBB_MISC_REV2, &chg->revision);
860 	if (rc) {
861 		dev_err(&pdev->dev, "unable to read revision\n");
862 		return rc;
863 	}
864 
865 	chg->revision += 1;
866 	if (chg->revision != 1 && chg->revision != 2 && chg->revision != 3) {
867 		dev_err(&pdev->dev, "v%d hardware not supported\n", chg->revision);
868 		return -ENODEV;
869 	}
870 	dev_info(&pdev->dev, "Initializing SMBB rev %u", chg->revision);
871 
872 	chg->dc_disabled = of_property_read_bool(pdev->dev.of_node, "qcom,disable-dc");
873 
874 	for (i = 0; i < _ATTR_CNT; ++i) {
875 		rc = smbb_charger_attr_parse(chg, i);
876 		if (rc) {
877 			dev_err(&pdev->dev, "failed to parse/apply settings\n");
878 			return rc;
879 		}
880 	}
881 
882 	bat_cfg.drv_data = chg;
883 	bat_cfg.of_node = pdev->dev.of_node;
884 	chg->bat_psy = devm_power_supply_register(&pdev->dev,
885 						  &bat_psy_desc,
886 						  &bat_cfg);
887 	if (IS_ERR(chg->bat_psy)) {
888 		dev_err(&pdev->dev, "failed to register battery\n");
889 		return PTR_ERR(chg->bat_psy);
890 	}
891 
892 	usb_cfg.drv_data = chg;
893 	usb_cfg.supplied_to = smbb_bif;
894 	usb_cfg.num_supplicants = ARRAY_SIZE(smbb_bif);
895 	chg->usb_psy = devm_power_supply_register(&pdev->dev,
896 						  &usb_psy_desc,
897 						  &usb_cfg);
898 	if (IS_ERR(chg->usb_psy)) {
899 		dev_err(&pdev->dev, "failed to register USB power supply\n");
900 		return PTR_ERR(chg->usb_psy);
901 	}
902 
903 	chg->edev = devm_extcon_dev_allocate(&pdev->dev, smbb_usb_extcon_cable);
904 	if (IS_ERR(chg->edev)) {
905 		dev_err(&pdev->dev, "failed to allocate extcon device\n");
906 		return -ENOMEM;
907 	}
908 
909 	rc = devm_extcon_dev_register(&pdev->dev, chg->edev);
910 	if (rc < 0) {
911 		dev_err(&pdev->dev, "failed to register extcon device\n");
912 		return rc;
913 	}
914 
915 	if (!chg->dc_disabled) {
916 		dc_cfg.drv_data = chg;
917 		dc_cfg.supplied_to = smbb_bif;
918 		dc_cfg.num_supplicants = ARRAY_SIZE(smbb_bif);
919 		chg->dc_psy = devm_power_supply_register(&pdev->dev,
920 							 &dc_psy_desc,
921 							 &dc_cfg);
922 		if (IS_ERR(chg->dc_psy)) {
923 			dev_err(&pdev->dev, "failed to register DC power supply\n");
924 			return PTR_ERR(chg->dc_psy);
925 		}
926 	}
927 
928 	for (i = 0; i < ARRAY_SIZE(smbb_charger_irqs); ++i) {
929 		int irq;
930 
931 		irq = platform_get_irq_byname(pdev, smbb_charger_irqs[i].name);
932 		if (irq < 0)
933 			return irq;
934 
935 		smbb_charger_irqs[i].handler(irq, chg);
936 
937 		rc = devm_request_threaded_irq(&pdev->dev, irq, NULL,
938 				smbb_charger_irqs[i].handler, IRQF_ONESHOT,
939 				smbb_charger_irqs[i].name, chg);
940 		if (rc) {
941 			dev_err(&pdev->dev, "failed to request irq '%s'\n",
942 				smbb_charger_irqs[i].name);
943 			return rc;
944 		}
945 	}
946 
947 	/*
948 	 * otg regulator is used to control VBUS voltage direction
949 	 * when USB switches between host and gadget mode
950 	 */
951 	chg->otg_rdesc.id = -1;
952 	chg->otg_rdesc.name = "otg-vbus";
953 	chg->otg_rdesc.ops = &smbb_chg_otg_ops;
954 	chg->otg_rdesc.owner = THIS_MODULE;
955 	chg->otg_rdesc.type = REGULATOR_VOLTAGE;
956 	chg->otg_rdesc.supply_name = "usb-otg-in";
957 	chg->otg_rdesc.of_match = "otg-vbus";
958 
959 	config.dev = &pdev->dev;
960 	config.driver_data = chg;
961 
962 	chg->otg_reg = devm_regulator_register(&pdev->dev, &chg->otg_rdesc,
963 					       &config);
964 	if (IS_ERR(chg->otg_reg))
965 		return PTR_ERR(chg->otg_reg);
966 
967 	chg->jeita_ext_temp = of_property_read_bool(pdev->dev.of_node,
968 			"qcom,jeita-extended-temp-range");
969 
970 	/* Set temperature range to [35%:70%] or [25%:80%] accordingly */
971 	rc = regmap_update_bits(chg->regmap, chg->addr + SMBB_BAT_BTC_CTRL,
972 			BTC_CTRL_COLD_EXT | BTC_CTRL_HOT_EXT_N,
973 			chg->jeita_ext_temp ?
974 				BTC_CTRL_COLD_EXT :
975 				BTC_CTRL_HOT_EXT_N);
976 	if (rc) {
977 		dev_err(&pdev->dev,
978 			"unable to set %s temperature range\n",
979 			chg->jeita_ext_temp ? "JEITA extended" : "normal");
980 		return rc;
981 	}
982 
983 	for (i = 0; i < ARRAY_SIZE(smbb_charger_setup); ++i) {
984 		const struct reg_off_mask_default *r = &smbb_charger_setup[i];
985 
986 		if (r->rev_mask & BIT(chg->revision))
987 			continue;
988 
989 		rc = regmap_update_bits(chg->regmap, chg->addr + r->offset,
990 				r->mask, r->value);
991 		if (rc) {
992 			dev_err(&pdev->dev,
993 				"unable to initializing charging, bailing\n");
994 			return rc;
995 		}
996 	}
997 
998 	platform_set_drvdata(pdev, chg);
999 
1000 	return 0;
1001 }
1002 
smbb_charger_remove(struct platform_device * pdev)1003 static int smbb_charger_remove(struct platform_device *pdev)
1004 {
1005 	struct smbb_charger *chg;
1006 
1007 	chg = platform_get_drvdata(pdev);
1008 
1009 	regmap_update_bits(chg->regmap, chg->addr + SMBB_CHG_CTRL, CTRL_EN, 0);
1010 
1011 	return 0;
1012 }
1013 
1014 static const struct of_device_id smbb_charger_id_table[] = {
1015 	{ .compatible = "qcom,pm8226-charger" },
1016 	{ .compatible = "qcom,pm8941-charger" },
1017 	{ }
1018 };
1019 MODULE_DEVICE_TABLE(of, smbb_charger_id_table);
1020 
1021 static struct platform_driver smbb_charger_driver = {
1022 	.probe	  = smbb_charger_probe,
1023 	.remove	 = smbb_charger_remove,
1024 	.driver	 = {
1025 		.name   = "qcom-smbb",
1026 		.of_match_table = smbb_charger_id_table,
1027 	},
1028 };
1029 module_platform_driver(smbb_charger_driver);
1030 
1031 MODULE_DESCRIPTION("Qualcomm Switch-Mode Battery Charger and Boost driver");
1032 MODULE_LICENSE("GPL v2");
1033