1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Summit Microelectronics SMB347 Battery Charger Driver
4  *
5  * Copyright (C) 2011, Intel Corporation
6  *
7  * Authors: Bruce E. Robertson <bruce.e.robertson@intel.com>
8  *          Mika Westerberg <mika.westerberg@linux.intel.com>
9  */
10 
11 #include <linux/delay.h>
12 #include <linux/err.h>
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/interrupt.h>
17 #include <linux/i2c.h>
18 #include <linux/power_supply.h>
19 #include <linux/property.h>
20 #include <linux/regmap.h>
21 #include <linux/regulator/driver.h>
22 
23 #include <dt-bindings/power/summit,smb347-charger.h>
24 
25 /* Use the default compensation method */
26 #define SMB3XX_SOFT_TEMP_COMPENSATE_DEFAULT -1
27 
28 /* Use default factory programmed value for hard/soft temperature limit */
29 #define SMB3XX_TEMP_USE_DEFAULT		-273
30 
31 /*
32  * Configuration registers. These are mirrored to volatile RAM and can be
33  * written once %CMD_A_ALLOW_WRITE is set in %CMD_A register. They will be
34  * reloaded from non-volatile registers after POR.
35  */
36 #define CFG_CHARGE_CURRENT			0x00
37 #define CFG_CHARGE_CURRENT_FCC_MASK		0xe0
38 #define CFG_CHARGE_CURRENT_FCC_SHIFT		5
39 #define CFG_CHARGE_CURRENT_PCC_MASK		0x18
40 #define CFG_CHARGE_CURRENT_PCC_SHIFT		3
41 #define CFG_CHARGE_CURRENT_TC_MASK		0x07
42 #define CFG_CURRENT_LIMIT			0x01
43 #define CFG_CURRENT_LIMIT_DC_MASK		0xf0
44 #define CFG_CURRENT_LIMIT_DC_SHIFT		4
45 #define CFG_CURRENT_LIMIT_USB_MASK		0x0f
46 #define CFG_FLOAT_VOLTAGE			0x03
47 #define CFG_FLOAT_VOLTAGE_FLOAT_MASK		0x3f
48 #define CFG_FLOAT_VOLTAGE_THRESHOLD_MASK	0xc0
49 #define CFG_FLOAT_VOLTAGE_THRESHOLD_SHIFT	6
50 #define CFG_STAT				0x05
51 #define CFG_STAT_DISABLED			BIT(5)
52 #define CFG_STAT_ACTIVE_HIGH			BIT(7)
53 #define CFG_PIN					0x06
54 #define CFG_PIN_EN_CTRL_MASK			0x60
55 #define CFG_PIN_EN_CTRL_ACTIVE_HIGH		0x40
56 #define CFG_PIN_EN_CTRL_ACTIVE_LOW		0x60
57 #define CFG_PIN_EN_APSD_IRQ			BIT(1)
58 #define CFG_PIN_EN_CHARGER_ERROR		BIT(2)
59 #define CFG_PIN_EN_CTRL				BIT(4)
60 #define CFG_THERM				0x07
61 #define CFG_THERM_SOFT_HOT_COMPENSATION_MASK	0x03
62 #define CFG_THERM_SOFT_HOT_COMPENSATION_SHIFT	0
63 #define CFG_THERM_SOFT_COLD_COMPENSATION_MASK	0x0c
64 #define CFG_THERM_SOFT_COLD_COMPENSATION_SHIFT	2
65 #define CFG_THERM_MONITOR_DISABLED		BIT(4)
66 #define CFG_SYSOK				0x08
67 #define CFG_SYSOK_INOK_ACTIVE_HIGH		BIT(0)
68 #define CFG_SYSOK_SUSPEND_HARD_LIMIT_DISABLED	BIT(2)
69 #define CFG_OTHER				0x09
70 #define CFG_OTHER_RID_MASK			0xc0
71 #define CFG_OTHER_RID_ENABLED_AUTO_OTG		0xc0
72 #define CFG_OTG					0x0a
73 #define CFG_OTG_TEMP_THRESHOLD_MASK		0x30
74 #define CFG_OTG_CURRENT_LIMIT_250mA		BIT(2)
75 #define CFG_OTG_CURRENT_LIMIT_750mA		BIT(3)
76 #define CFG_OTG_TEMP_THRESHOLD_SHIFT		4
77 #define CFG_OTG_CC_COMPENSATION_MASK		0xc0
78 #define CFG_OTG_CC_COMPENSATION_SHIFT		6
79 #define CFG_TEMP_LIMIT				0x0b
80 #define CFG_TEMP_LIMIT_SOFT_HOT_MASK		0x03
81 #define CFG_TEMP_LIMIT_SOFT_HOT_SHIFT		0
82 #define CFG_TEMP_LIMIT_SOFT_COLD_MASK		0x0c
83 #define CFG_TEMP_LIMIT_SOFT_COLD_SHIFT		2
84 #define CFG_TEMP_LIMIT_HARD_HOT_MASK		0x30
85 #define CFG_TEMP_LIMIT_HARD_HOT_SHIFT		4
86 #define CFG_TEMP_LIMIT_HARD_COLD_MASK		0xc0
87 #define CFG_TEMP_LIMIT_HARD_COLD_SHIFT		6
88 #define CFG_FAULT_IRQ				0x0c
89 #define CFG_FAULT_IRQ_DCIN_UV			BIT(2)
90 #define CFG_STATUS_IRQ				0x0d
91 #define CFG_STATUS_IRQ_TERMINATION_OR_TAPER	BIT(4)
92 #define CFG_STATUS_IRQ_CHARGE_TIMEOUT		BIT(7)
93 #define CFG_ADDRESS				0x0e
94 
95 /* Command registers */
96 #define CMD_A					0x30
97 #define CMD_A_CHG_ENABLED			BIT(1)
98 #define CMD_A_SUSPEND_ENABLED			BIT(2)
99 #define CMD_A_OTG_ENABLED			BIT(4)
100 #define CMD_A_ALLOW_WRITE			BIT(7)
101 #define CMD_B					0x31
102 #define CMD_C					0x33
103 
104 /* Interrupt Status registers */
105 #define IRQSTAT_A				0x35
106 #define IRQSTAT_C				0x37
107 #define IRQSTAT_C_TERMINATION_STAT		BIT(0)
108 #define IRQSTAT_C_TERMINATION_IRQ		BIT(1)
109 #define IRQSTAT_C_TAPER_IRQ			BIT(3)
110 #define IRQSTAT_D				0x38
111 #define IRQSTAT_D_CHARGE_TIMEOUT_STAT		BIT(2)
112 #define IRQSTAT_D_CHARGE_TIMEOUT_IRQ		BIT(3)
113 #define IRQSTAT_E				0x39
114 #define IRQSTAT_E_USBIN_UV_STAT			BIT(0)
115 #define IRQSTAT_E_USBIN_UV_IRQ			BIT(1)
116 #define IRQSTAT_E_DCIN_UV_STAT			BIT(4)
117 #define IRQSTAT_E_DCIN_UV_IRQ			BIT(5)
118 #define IRQSTAT_F				0x3a
119 
120 /* Status registers */
121 #define STAT_A					0x3b
122 #define STAT_A_FLOAT_VOLTAGE_MASK		0x3f
123 #define STAT_B					0x3c
124 #define STAT_C					0x3d
125 #define STAT_C_CHG_ENABLED			BIT(0)
126 #define STAT_C_HOLDOFF_STAT			BIT(3)
127 #define STAT_C_CHG_MASK				0x06
128 #define STAT_C_CHG_SHIFT			1
129 #define STAT_C_CHG_TERM				BIT(5)
130 #define STAT_C_CHARGER_ERROR			BIT(6)
131 #define STAT_E					0x3f
132 
133 #define SMB347_MAX_REGISTER			0x3f
134 
135 /**
136  * struct smb347_charger - smb347 charger instance
137  * @dev: pointer to device
138  * @regmap: pointer to driver regmap
139  * @mains: power_supply instance for AC/DC power
140  * @usb: power_supply instance for USB power
141  * @usb_rdev: USB VBUS regulator device
142  * @id: SMB charger ID
143  * @mains_online: is AC/DC input connected
144  * @usb_online: is USB input connected
145  * @irq_unsupported: is interrupt unsupported by SMB hardware
146  * @usb_vbus_enabled: is USB VBUS powered by SMB charger
147  * @max_charge_current: maximum current (in uA) the battery can be charged
148  * @max_charge_voltage: maximum voltage (in uV) the battery can be charged
149  * @pre_charge_current: current (in uA) to use in pre-charging phase
150  * @termination_current: current (in uA) used to determine when the
151  *			 charging cycle terminates
152  * @pre_to_fast_voltage: voltage (in uV) treshold used for transitioning to
153  *			 pre-charge to fast charge mode
154  * @mains_current_limit: maximum input current drawn from AC/DC input (in uA)
155  * @usb_hc_current_limit: maximum input high current (in uA) drawn from USB
156  *			  input
157  * @chip_temp_threshold: die temperature where device starts limiting charge
158  *			 current [%100 - %130] (in degree C)
159  * @soft_cold_temp_limit: soft cold temperature limit [%0 - %15] (in degree C),
160  *			  granularity is 5 deg C.
161  * @soft_hot_temp_limit: soft hot temperature limit [%40 - %55] (in degree  C),
162  *			 granularity is 5 deg C.
163  * @hard_cold_temp_limit: hard cold temperature limit [%-5 - %10] (in degree C),
164  *			  granularity is 5 deg C.
165  * @hard_hot_temp_limit: hard hot temperature limit [%50 - %65] (in degree C),
166  *			 granularity is 5 deg C.
167  * @suspend_on_hard_temp_limit: suspend charging when hard limit is hit
168  * @soft_temp_limit_compensation: compensation method when soft temperature
169  *				  limit is hit
170  * @charge_current_compensation: current (in uA) for charging compensation
171  *				 current when temperature hits soft limits
172  * @use_mains: AC/DC input can be used
173  * @use_usb: USB input can be used
174  * @use_usb_otg: USB OTG output can be used (not implemented yet)
175  * @enable_control: how charging enable/disable is controlled
176  *		    (driver/pin controls)
177  * @inok_polarity: polarity of INOK signal which denotes presence of external
178  *		   power supply
179  *
180  * @use_main, @use_usb, and @use_usb_otg are means to enable/disable
181  * hardware support for these. This is useful when we want to have for
182  * example OTG charging controlled via OTG transceiver driver and not by
183  * the SMB347 hardware.
184  *
185  * Hard and soft temperature limit values are given as described in the
186  * device data sheet and assuming NTC beta value is %3750. Even if this is
187  * not the case, these values should be used. They can be mapped to the
188  * corresponding NTC beta values with the help of table %2 in the data
189  * sheet. So for example if NTC beta is %3375 and we want to program hard
190  * hot limit to be %53 deg C, @hard_hot_temp_limit should be set to %50.
191  *
192  * If zero value is given in any of the current and voltage values, the
193  * factory programmed default will be used. For soft/hard temperature
194  * values, pass in %SMB3XX_TEMP_USE_DEFAULT instead.
195  */
196 struct smb347_charger {
197 	struct device		*dev;
198 	struct regmap		*regmap;
199 	struct power_supply	*mains;
200 	struct power_supply	*usb;
201 	struct regulator_dev	*usb_rdev;
202 	unsigned int		id;
203 	bool			mains_online;
204 	bool			usb_online;
205 	bool			irq_unsupported;
206 	bool			usb_vbus_enabled;
207 
208 	unsigned int		max_charge_current;
209 	unsigned int		max_charge_voltage;
210 	unsigned int		pre_charge_current;
211 	unsigned int		termination_current;
212 	unsigned int		pre_to_fast_voltage;
213 	unsigned int		mains_current_limit;
214 	unsigned int		usb_hc_current_limit;
215 	unsigned int		chip_temp_threshold;
216 	int			soft_cold_temp_limit;
217 	int			soft_hot_temp_limit;
218 	int			hard_cold_temp_limit;
219 	int			hard_hot_temp_limit;
220 	bool			suspend_on_hard_temp_limit;
221 	unsigned int		soft_temp_limit_compensation;
222 	unsigned int		charge_current_compensation;
223 	bool			use_mains;
224 	bool			use_usb;
225 	bool			use_usb_otg;
226 	unsigned int		enable_control;
227 	unsigned int		inok_polarity;
228 };
229 
230 enum smb_charger_chipid {
231 	SMB345,
232 	SMB347,
233 	SMB358,
234 	NUM_CHIP_TYPES,
235 };
236 
237 /* Fast charge current in uA */
238 static const unsigned int fcc_tbl[NUM_CHIP_TYPES][8] = {
239 	[SMB345] = {  200000,  450000,  600000,  900000,
240 		     1300000, 1500000, 1800000, 2000000 },
241 	[SMB347] = {  700000,  900000, 1200000, 1500000,
242 		     1800000, 2000000, 2200000, 2500000 },
243 	[SMB358] = {  200000,  450000,  600000,  900000,
244 		     1300000, 1500000, 1800000, 2000000 },
245 };
246 /* Pre-charge current in uA */
247 static const unsigned int pcc_tbl[NUM_CHIP_TYPES][4] = {
248 	[SMB345] = { 150000, 250000, 350000, 450000 },
249 	[SMB347] = { 100000, 150000, 200000, 250000 },
250 	[SMB358] = { 150000, 250000, 350000, 450000 },
251 };
252 
253 /* Termination current in uA */
254 static const unsigned int tc_tbl[NUM_CHIP_TYPES][8] = {
255 	[SMB345] = {  30000,  40000,  60000,  80000,
256 		     100000, 125000, 150000, 200000 },
257 	[SMB347] = {  37500,  50000, 100000, 150000,
258 		     200000, 250000, 500000, 600000 },
259 	[SMB358] = {  30000,  40000,  60000,  80000,
260 		     100000, 125000, 150000, 200000 },
261 };
262 
263 /* Input current limit in uA */
264 static const unsigned int icl_tbl[NUM_CHIP_TYPES][10] = {
265 	[SMB345] = {  300000,  500000,  700000, 1000000, 1500000,
266 		     1800000, 2000000, 2000000, 2000000, 2000000 },
267 	[SMB347] = {  300000,  500000,  700000,  900000, 1200000,
268 		     1500000, 1800000, 2000000, 2200000, 2500000 },
269 	[SMB358] = {  300000,  500000,  700000, 1000000, 1500000,
270 		     1800000, 2000000, 2000000, 2000000, 2000000 },
271 };
272 
273 /* Charge current compensation in uA */
274 static const unsigned int ccc_tbl[NUM_CHIP_TYPES][4] = {
275 	[SMB345] = {  200000,  450000,  600000,  900000 },
276 	[SMB347] = {  250000,  700000,  900000, 1200000 },
277 	[SMB358] = {  200000,  450000,  600000,  900000 },
278 };
279 
280 /* Convert register value to current using lookup table */
281 static int hw_to_current(const unsigned int *tbl, size_t size, unsigned int val)
282 {
283 	if (val >= size)
284 		return -EINVAL;
285 	return tbl[val];
286 }
287 
288 /* Convert current to register value using lookup table */
289 static int current_to_hw(const unsigned int *tbl, size_t size, unsigned int val)
290 {
291 	size_t i;
292 
293 	for (i = 0; i < size; i++)
294 		if (val < tbl[i])
295 			break;
296 	return i > 0 ? i - 1 : -EINVAL;
297 }
298 
299 /**
300  * smb347_update_ps_status - refreshes the power source status
301  * @smb: pointer to smb347 charger instance
302  *
303  * Function checks whether any power source is connected to the charger and
304  * updates internal state accordingly. If there is a change to previous state
305  * function returns %1, otherwise %0 and negative errno in case of errror.
306  */
307 static int smb347_update_ps_status(struct smb347_charger *smb)
308 {
309 	bool usb = false;
310 	bool dc = false;
311 	unsigned int val;
312 	int ret;
313 
314 	ret = regmap_read(smb->regmap, IRQSTAT_E, &val);
315 	if (ret < 0)
316 		return ret;
317 
318 	/*
319 	 * Dc and usb are set depending on whether they are enabled in
320 	 * platform data _and_ whether corresponding undervoltage is set.
321 	 */
322 	if (smb->use_mains)
323 		dc = !(val & IRQSTAT_E_DCIN_UV_STAT);
324 	if (smb->use_usb)
325 		usb = !(val & IRQSTAT_E_USBIN_UV_STAT);
326 
327 	ret = smb->mains_online != dc || smb->usb_online != usb;
328 	smb->mains_online = dc;
329 	smb->usb_online = usb;
330 
331 	return ret;
332 }
333 
334 /*
335  * smb347_is_ps_online - returns whether input power source is connected
336  * @smb: pointer to smb347 charger instance
337  *
338  * Returns %true if input power source is connected. Note that this is
339  * dependent on what platform has configured for usable power sources. For
340  * example if USB is disabled, this will return %false even if the USB cable
341  * is connected.
342  */
343 static bool smb347_is_ps_online(struct smb347_charger *smb)
344 {
345 	return smb->usb_online || smb->mains_online;
346 }
347 
348 /**
349  * smb347_charging_status - returns status of charging
350  * @smb: pointer to smb347 charger instance
351  *
352  * Function returns charging status. %0 means no charging is in progress,
353  * %1 means pre-charging, %2 fast-charging and %3 taper-charging.
354  */
355 static int smb347_charging_status(struct smb347_charger *smb)
356 {
357 	unsigned int val;
358 	int ret;
359 
360 	if (!smb347_is_ps_online(smb))
361 		return 0;
362 
363 	ret = regmap_read(smb->regmap, STAT_C, &val);
364 	if (ret < 0)
365 		return 0;
366 
367 	return (val & STAT_C_CHG_MASK) >> STAT_C_CHG_SHIFT;
368 }
369 
370 static int smb347_charging_set(struct smb347_charger *smb, bool enable)
371 {
372 	if (smb->enable_control != SMB3XX_CHG_ENABLE_SW) {
373 		dev_dbg(smb->dev, "charging enable/disable in SW disabled\n");
374 		return 0;
375 	}
376 
377 	if (enable && smb->usb_vbus_enabled) {
378 		dev_dbg(smb->dev, "charging not enabled because USB is in host mode\n");
379 		return 0;
380 	}
381 
382 	return regmap_update_bits(smb->regmap, CMD_A, CMD_A_CHG_ENABLED,
383 				  enable ? CMD_A_CHG_ENABLED : 0);
384 }
385 
386 static inline int smb347_charging_enable(struct smb347_charger *smb)
387 {
388 	return smb347_charging_set(smb, true);
389 }
390 
391 static inline int smb347_charging_disable(struct smb347_charger *smb)
392 {
393 	return smb347_charging_set(smb, false);
394 }
395 
396 static int smb347_start_stop_charging(struct smb347_charger *smb)
397 {
398 	int ret;
399 
400 	/*
401 	 * Depending on whether valid power source is connected or not, we
402 	 * disable or enable the charging. We do it manually because it
403 	 * depends on how the platform has configured the valid inputs.
404 	 */
405 	if (smb347_is_ps_online(smb)) {
406 		ret = smb347_charging_enable(smb);
407 		if (ret < 0)
408 			dev_err(smb->dev, "failed to enable charging\n");
409 	} else {
410 		ret = smb347_charging_disable(smb);
411 		if (ret < 0)
412 			dev_err(smb->dev, "failed to disable charging\n");
413 	}
414 
415 	return ret;
416 }
417 
418 static int smb347_set_charge_current(struct smb347_charger *smb)
419 {
420 	unsigned int id = smb->id;
421 	int ret;
422 
423 	if (smb->max_charge_current) {
424 		ret = current_to_hw(fcc_tbl[id], ARRAY_SIZE(fcc_tbl[id]),
425 				    smb->max_charge_current);
426 		if (ret < 0)
427 			return ret;
428 
429 		ret = regmap_update_bits(smb->regmap, CFG_CHARGE_CURRENT,
430 					 CFG_CHARGE_CURRENT_FCC_MASK,
431 					 ret << CFG_CHARGE_CURRENT_FCC_SHIFT);
432 		if (ret < 0)
433 			return ret;
434 	}
435 
436 	if (smb->pre_charge_current) {
437 		ret = current_to_hw(pcc_tbl[id], ARRAY_SIZE(pcc_tbl[id]),
438 				    smb->pre_charge_current);
439 		if (ret < 0)
440 			return ret;
441 
442 		ret = regmap_update_bits(smb->regmap, CFG_CHARGE_CURRENT,
443 					 CFG_CHARGE_CURRENT_PCC_MASK,
444 					 ret << CFG_CHARGE_CURRENT_PCC_SHIFT);
445 		if (ret < 0)
446 			return ret;
447 	}
448 
449 	if (smb->termination_current) {
450 		ret = current_to_hw(tc_tbl[id], ARRAY_SIZE(tc_tbl[id]),
451 				    smb->termination_current);
452 		if (ret < 0)
453 			return ret;
454 
455 		ret = regmap_update_bits(smb->regmap, CFG_CHARGE_CURRENT,
456 					 CFG_CHARGE_CURRENT_TC_MASK, ret);
457 		if (ret < 0)
458 			return ret;
459 	}
460 
461 	return 0;
462 }
463 
464 static int smb347_set_current_limits(struct smb347_charger *smb)
465 {
466 	unsigned int id = smb->id;
467 	int ret;
468 
469 	if (smb->mains_current_limit) {
470 		ret = current_to_hw(icl_tbl[id], ARRAY_SIZE(icl_tbl[id]),
471 				    smb->mains_current_limit);
472 		if (ret < 0)
473 			return ret;
474 
475 		ret = regmap_update_bits(smb->regmap, CFG_CURRENT_LIMIT,
476 					 CFG_CURRENT_LIMIT_DC_MASK,
477 					 ret << CFG_CURRENT_LIMIT_DC_SHIFT);
478 		if (ret < 0)
479 			return ret;
480 	}
481 
482 	if (smb->usb_hc_current_limit) {
483 		ret = current_to_hw(icl_tbl[id], ARRAY_SIZE(icl_tbl[id]),
484 				    smb->usb_hc_current_limit);
485 		if (ret < 0)
486 			return ret;
487 
488 		ret = regmap_update_bits(smb->regmap, CFG_CURRENT_LIMIT,
489 					 CFG_CURRENT_LIMIT_USB_MASK, ret);
490 		if (ret < 0)
491 			return ret;
492 	}
493 
494 	return 0;
495 }
496 
497 static int smb347_set_voltage_limits(struct smb347_charger *smb)
498 {
499 	int ret;
500 
501 	if (smb->pre_to_fast_voltage) {
502 		ret = smb->pre_to_fast_voltage;
503 
504 		/* uV */
505 		ret = clamp_val(ret, 2400000, 3000000) - 2400000;
506 		ret /= 200000;
507 
508 		ret = regmap_update_bits(smb->regmap, CFG_FLOAT_VOLTAGE,
509 				CFG_FLOAT_VOLTAGE_THRESHOLD_MASK,
510 				ret << CFG_FLOAT_VOLTAGE_THRESHOLD_SHIFT);
511 		if (ret < 0)
512 			return ret;
513 	}
514 
515 	if (smb->max_charge_voltage) {
516 		ret = smb->max_charge_voltage;
517 
518 		/* uV */
519 		ret = clamp_val(ret, 3500000, 4500000) - 3500000;
520 		ret /= 20000;
521 
522 		ret = regmap_update_bits(smb->regmap, CFG_FLOAT_VOLTAGE,
523 					 CFG_FLOAT_VOLTAGE_FLOAT_MASK, ret);
524 		if (ret < 0)
525 			return ret;
526 	}
527 
528 	return 0;
529 }
530 
531 static int smb347_set_temp_limits(struct smb347_charger *smb)
532 {
533 	unsigned int id = smb->id;
534 	bool enable_therm_monitor = false;
535 	int ret = 0;
536 	int val;
537 
538 	if (smb->chip_temp_threshold) {
539 		val = smb->chip_temp_threshold;
540 
541 		/* degree C */
542 		val = clamp_val(val, 100, 130) - 100;
543 		val /= 10;
544 
545 		ret = regmap_update_bits(smb->regmap, CFG_OTG,
546 					 CFG_OTG_TEMP_THRESHOLD_MASK,
547 					 val << CFG_OTG_TEMP_THRESHOLD_SHIFT);
548 		if (ret < 0)
549 			return ret;
550 	}
551 
552 	if (smb->soft_cold_temp_limit != SMB3XX_TEMP_USE_DEFAULT) {
553 		val = smb->soft_cold_temp_limit;
554 
555 		val = clamp_val(val, 0, 15);
556 		val /= 5;
557 		/* this goes from higher to lower so invert the value */
558 		val = ~val & 0x3;
559 
560 		ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
561 					 CFG_TEMP_LIMIT_SOFT_COLD_MASK,
562 					 val << CFG_TEMP_LIMIT_SOFT_COLD_SHIFT);
563 		if (ret < 0)
564 			return ret;
565 
566 		enable_therm_monitor = true;
567 	}
568 
569 	if (smb->soft_hot_temp_limit != SMB3XX_TEMP_USE_DEFAULT) {
570 		val = smb->soft_hot_temp_limit;
571 
572 		val = clamp_val(val, 40, 55) - 40;
573 		val /= 5;
574 
575 		ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
576 					 CFG_TEMP_LIMIT_SOFT_HOT_MASK,
577 					 val << CFG_TEMP_LIMIT_SOFT_HOT_SHIFT);
578 		if (ret < 0)
579 			return ret;
580 
581 		enable_therm_monitor = true;
582 	}
583 
584 	if (smb->hard_cold_temp_limit != SMB3XX_TEMP_USE_DEFAULT) {
585 		val = smb->hard_cold_temp_limit;
586 
587 		val = clamp_val(val, -5, 10) + 5;
588 		val /= 5;
589 		/* this goes from higher to lower so invert the value */
590 		val = ~val & 0x3;
591 
592 		ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
593 					 CFG_TEMP_LIMIT_HARD_COLD_MASK,
594 					 val << CFG_TEMP_LIMIT_HARD_COLD_SHIFT);
595 		if (ret < 0)
596 			return ret;
597 
598 		enable_therm_monitor = true;
599 	}
600 
601 	if (smb->hard_hot_temp_limit != SMB3XX_TEMP_USE_DEFAULT) {
602 		val = smb->hard_hot_temp_limit;
603 
604 		val = clamp_val(val, 50, 65) - 50;
605 		val /= 5;
606 
607 		ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
608 					 CFG_TEMP_LIMIT_HARD_HOT_MASK,
609 					 val << CFG_TEMP_LIMIT_HARD_HOT_SHIFT);
610 		if (ret < 0)
611 			return ret;
612 
613 		enable_therm_monitor = true;
614 	}
615 
616 	/*
617 	 * If any of the temperature limits are set, we also enable the
618 	 * thermistor monitoring.
619 	 *
620 	 * When soft limits are hit, the device will start to compensate
621 	 * current and/or voltage depending on the configuration.
622 	 *
623 	 * When hard limit is hit, the device will suspend charging
624 	 * depending on the configuration.
625 	 */
626 	if (enable_therm_monitor) {
627 		ret = regmap_update_bits(smb->regmap, CFG_THERM,
628 					 CFG_THERM_MONITOR_DISABLED, 0);
629 		if (ret < 0)
630 			return ret;
631 	}
632 
633 	if (smb->suspend_on_hard_temp_limit) {
634 		ret = regmap_update_bits(smb->regmap, CFG_SYSOK,
635 				 CFG_SYSOK_SUSPEND_HARD_LIMIT_DISABLED, 0);
636 		if (ret < 0)
637 			return ret;
638 	}
639 
640 	if (smb->soft_temp_limit_compensation !=
641 	    SMB3XX_SOFT_TEMP_COMPENSATE_DEFAULT) {
642 		val = smb->soft_temp_limit_compensation & 0x3;
643 
644 		ret = regmap_update_bits(smb->regmap, CFG_THERM,
645 				 CFG_THERM_SOFT_HOT_COMPENSATION_MASK,
646 				 val << CFG_THERM_SOFT_HOT_COMPENSATION_SHIFT);
647 		if (ret < 0)
648 			return ret;
649 
650 		ret = regmap_update_bits(smb->regmap, CFG_THERM,
651 				 CFG_THERM_SOFT_COLD_COMPENSATION_MASK,
652 				 val << CFG_THERM_SOFT_COLD_COMPENSATION_SHIFT);
653 		if (ret < 0)
654 			return ret;
655 	}
656 
657 	if (smb->charge_current_compensation) {
658 		val = current_to_hw(ccc_tbl[id], ARRAY_SIZE(ccc_tbl[id]),
659 				    smb->charge_current_compensation);
660 		if (val < 0)
661 			return val;
662 
663 		ret = regmap_update_bits(smb->regmap, CFG_OTG,
664 				CFG_OTG_CC_COMPENSATION_MASK,
665 				(val & 0x3) << CFG_OTG_CC_COMPENSATION_SHIFT);
666 		if (ret < 0)
667 			return ret;
668 	}
669 
670 	return ret;
671 }
672 
673 /*
674  * smb347_set_writable - enables/disables writing to non-volatile registers
675  * @smb: pointer to smb347 charger instance
676  *
677  * You can enable/disable writing to the non-volatile configuration
678  * registers by calling this function.
679  *
680  * Returns %0 on success and negative errno in case of failure.
681  */
682 static int smb347_set_writable(struct smb347_charger *smb, bool writable,
683 			       bool irq_toggle)
684 {
685 	struct i2c_client *client = to_i2c_client(smb->dev);
686 	int ret;
687 
688 	if (writable && irq_toggle && !smb->irq_unsupported)
689 		disable_irq(client->irq);
690 
691 	ret = regmap_update_bits(smb->regmap, CMD_A, CMD_A_ALLOW_WRITE,
692 				 writable ? CMD_A_ALLOW_WRITE : 0);
693 
694 	if ((!writable || ret) && irq_toggle && !smb->irq_unsupported)
695 		enable_irq(client->irq);
696 
697 	return ret;
698 }
699 
700 static int smb347_hw_init(struct smb347_charger *smb)
701 {
702 	unsigned int val;
703 	int ret;
704 
705 	ret = smb347_set_writable(smb, true, false);
706 	if (ret < 0)
707 		return ret;
708 
709 	/*
710 	 * Program the platform specific configuration values to the device
711 	 * first.
712 	 */
713 	ret = smb347_set_charge_current(smb);
714 	if (ret < 0)
715 		goto fail;
716 
717 	ret = smb347_set_current_limits(smb);
718 	if (ret < 0)
719 		goto fail;
720 
721 	ret = smb347_set_voltage_limits(smb);
722 	if (ret < 0)
723 		goto fail;
724 
725 	ret = smb347_set_temp_limits(smb);
726 	if (ret < 0)
727 		goto fail;
728 
729 	/* If USB charging is disabled we put the USB in suspend mode */
730 	if (!smb->use_usb) {
731 		ret = regmap_update_bits(smb->regmap, CMD_A,
732 					 CMD_A_SUSPEND_ENABLED,
733 					 CMD_A_SUSPEND_ENABLED);
734 		if (ret < 0)
735 			goto fail;
736 	}
737 
738 	/*
739 	 * If configured by platform data, we enable hardware Auto-OTG
740 	 * support for driving VBUS. Otherwise we disable it.
741 	 */
742 	ret = regmap_update_bits(smb->regmap, CFG_OTHER, CFG_OTHER_RID_MASK,
743 		smb->use_usb_otg ? CFG_OTHER_RID_ENABLED_AUTO_OTG : 0);
744 	if (ret < 0)
745 		goto fail;
746 
747 	/* Activate pin control, making it writable. */
748 	switch (smb->enable_control) {
749 	case SMB3XX_CHG_ENABLE_PIN_ACTIVE_LOW:
750 	case SMB3XX_CHG_ENABLE_PIN_ACTIVE_HIGH:
751 		ret = regmap_set_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_CTRL);
752 		if (ret < 0)
753 			goto fail;
754 	}
755 
756 	/*
757 	 * Make the charging functionality controllable by a write to the
758 	 * command register unless pin control is specified in the platform
759 	 * data.
760 	 */
761 	switch (smb->enable_control) {
762 	case SMB3XX_CHG_ENABLE_PIN_ACTIVE_LOW:
763 		val = CFG_PIN_EN_CTRL_ACTIVE_LOW;
764 		break;
765 	case SMB3XX_CHG_ENABLE_PIN_ACTIVE_HIGH:
766 		val = CFG_PIN_EN_CTRL_ACTIVE_HIGH;
767 		break;
768 	default:
769 		val = 0;
770 		break;
771 	}
772 
773 	ret = regmap_update_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_CTRL_MASK,
774 				 val);
775 	if (ret < 0)
776 		goto fail;
777 
778 	/* Disable Automatic Power Source Detection (APSD) interrupt. */
779 	ret = regmap_update_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_APSD_IRQ, 0);
780 	if (ret < 0)
781 		goto fail;
782 
783 	ret = smb347_update_ps_status(smb);
784 	if (ret < 0)
785 		goto fail;
786 
787 	ret = smb347_start_stop_charging(smb);
788 
789 fail:
790 	smb347_set_writable(smb, false, false);
791 	return ret;
792 }
793 
794 static irqreturn_t smb347_interrupt(int irq, void *data)
795 {
796 	struct smb347_charger *smb = data;
797 	unsigned int stat_c, irqstat_c, irqstat_d, irqstat_e;
798 	bool handled = false;
799 	int ret;
800 
801 	/* SMB347 it needs at least 20ms for setting IRQSTAT_E_*IN_UV_IRQ */
802 	usleep_range(25000, 35000);
803 
804 	ret = regmap_read(smb->regmap, STAT_C, &stat_c);
805 	if (ret < 0) {
806 		dev_warn(smb->dev, "reading STAT_C failed\n");
807 		return IRQ_NONE;
808 	}
809 
810 	ret = regmap_read(smb->regmap, IRQSTAT_C, &irqstat_c);
811 	if (ret < 0) {
812 		dev_warn(smb->dev, "reading IRQSTAT_C failed\n");
813 		return IRQ_NONE;
814 	}
815 
816 	ret = regmap_read(smb->regmap, IRQSTAT_D, &irqstat_d);
817 	if (ret < 0) {
818 		dev_warn(smb->dev, "reading IRQSTAT_D failed\n");
819 		return IRQ_NONE;
820 	}
821 
822 	ret = regmap_read(smb->regmap, IRQSTAT_E, &irqstat_e);
823 	if (ret < 0) {
824 		dev_warn(smb->dev, "reading IRQSTAT_E failed\n");
825 		return IRQ_NONE;
826 	}
827 
828 	/*
829 	 * If we get charger error we report the error back to user.
830 	 * If the error is recovered charging will resume again.
831 	 */
832 	if (stat_c & STAT_C_CHARGER_ERROR) {
833 		dev_err(smb->dev, "charging stopped due to charger error\n");
834 		if (smb->use_mains)
835 			power_supply_changed(smb->mains);
836 		if (smb->use_usb)
837 			power_supply_changed(smb->usb);
838 		handled = true;
839 	}
840 
841 	/*
842 	 * If we reached the termination current the battery is charged and
843 	 * we can update the status now. Charging is automatically
844 	 * disabled by the hardware.
845 	 */
846 	if (irqstat_c & (IRQSTAT_C_TERMINATION_IRQ | IRQSTAT_C_TAPER_IRQ)) {
847 		if (irqstat_c & IRQSTAT_C_TERMINATION_STAT) {
848 			if (smb->use_mains)
849 				power_supply_changed(smb->mains);
850 			if (smb->use_usb)
851 				power_supply_changed(smb->usb);
852 		}
853 		dev_dbg(smb->dev, "going to HW maintenance mode\n");
854 		handled = true;
855 	}
856 
857 	/*
858 	 * If we got a charger timeout INT that means the charge
859 	 * full is not detected with in charge timeout value.
860 	 */
861 	if (irqstat_d & IRQSTAT_D_CHARGE_TIMEOUT_IRQ) {
862 		dev_dbg(smb->dev, "total Charge Timeout INT received\n");
863 
864 		if (irqstat_d & IRQSTAT_D_CHARGE_TIMEOUT_STAT)
865 			dev_warn(smb->dev, "charging stopped due to timeout\n");
866 		if (smb->use_mains)
867 			power_supply_changed(smb->mains);
868 		if (smb->use_usb)
869 			power_supply_changed(smb->usb);
870 		handled = true;
871 	}
872 
873 	/*
874 	 * If we got an under voltage interrupt it means that AC/USB input
875 	 * was connected or disconnected.
876 	 */
877 	if (irqstat_e & (IRQSTAT_E_USBIN_UV_IRQ | IRQSTAT_E_DCIN_UV_IRQ)) {
878 		if (smb347_update_ps_status(smb) > 0) {
879 			smb347_start_stop_charging(smb);
880 			if (smb->use_mains)
881 				power_supply_changed(smb->mains);
882 			if (smb->use_usb)
883 				power_supply_changed(smb->usb);
884 		}
885 		handled = true;
886 	}
887 
888 	return handled ? IRQ_HANDLED : IRQ_NONE;
889 }
890 
891 static int smb347_irq_set(struct smb347_charger *smb, bool enable)
892 {
893 	int ret;
894 
895 	if (smb->irq_unsupported)
896 		return 0;
897 
898 	ret = smb347_set_writable(smb, true, true);
899 	if (ret < 0)
900 		return ret;
901 
902 	/*
903 	 * Enable/disable interrupts for:
904 	 *	- under voltage
905 	 *	- termination current reached
906 	 *	- charger timeout
907 	 *	- charger error
908 	 */
909 	ret = regmap_update_bits(smb->regmap, CFG_FAULT_IRQ, 0xff,
910 				 enable ? CFG_FAULT_IRQ_DCIN_UV : 0);
911 	if (ret < 0)
912 		goto fail;
913 
914 	ret = regmap_update_bits(smb->regmap, CFG_STATUS_IRQ, 0xff,
915 			enable ? (CFG_STATUS_IRQ_TERMINATION_OR_TAPER |
916 					CFG_STATUS_IRQ_CHARGE_TIMEOUT) : 0);
917 	if (ret < 0)
918 		goto fail;
919 
920 	ret = regmap_update_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_CHARGER_ERROR,
921 				 enable ? CFG_PIN_EN_CHARGER_ERROR : 0);
922 fail:
923 	smb347_set_writable(smb, false, true);
924 	return ret;
925 }
926 
927 static inline int smb347_irq_enable(struct smb347_charger *smb)
928 {
929 	return smb347_irq_set(smb, true);
930 }
931 
932 static inline int smb347_irq_disable(struct smb347_charger *smb)
933 {
934 	return smb347_irq_set(smb, false);
935 }
936 
937 static int smb347_irq_init(struct smb347_charger *smb,
938 			   struct i2c_client *client)
939 {
940 	int ret;
941 
942 	smb->irq_unsupported = true;
943 
944 	/*
945 	 * Interrupt pin is optional. If it is connected, we setup the
946 	 * interrupt support here.
947 	 */
948 	if (!client->irq)
949 		return 0;
950 
951 	ret = smb347_set_writable(smb, true, false);
952 	if (ret < 0)
953 		return ret;
954 
955 	/*
956 	 * Configure the STAT output to be suitable for interrupts: disable
957 	 * all other output (except interrupts) and make it active low.
958 	 */
959 	ret = regmap_update_bits(smb->regmap, CFG_STAT,
960 				 CFG_STAT_ACTIVE_HIGH | CFG_STAT_DISABLED,
961 				 CFG_STAT_DISABLED);
962 
963 	smb347_set_writable(smb, false, false);
964 
965 	if (ret < 0) {
966 		dev_warn(smb->dev, "failed to initialize IRQ: %d\n", ret);
967 		dev_warn(smb->dev, "disabling IRQ support\n");
968 		return 0;
969 	}
970 
971 	ret = devm_request_threaded_irq(smb->dev, client->irq, NULL,
972 					smb347_interrupt, IRQF_ONESHOT,
973 					client->name, smb);
974 	if (ret)
975 		return ret;
976 
977 	smb->irq_unsupported = false;
978 
979 	ret = smb347_irq_enable(smb);
980 	if (ret < 0)
981 		return ret;
982 
983 	return 0;
984 }
985 
986 /*
987  * Returns the constant charge current programmed
988  * into the charger in uA.
989  */
990 static int get_const_charge_current(struct smb347_charger *smb)
991 {
992 	unsigned int id = smb->id;
993 	int ret, intval;
994 	unsigned int v;
995 
996 	if (!smb347_is_ps_online(smb))
997 		return -ENODATA;
998 
999 	ret = regmap_read(smb->regmap, STAT_B, &v);
1000 	if (ret < 0)
1001 		return ret;
1002 
1003 	/*
1004 	 * The current value is composition of FCC and PCC values
1005 	 * and we can detect which table to use from bit 5.
1006 	 */
1007 	if (v & 0x20) {
1008 		intval = hw_to_current(fcc_tbl[id],
1009 				       ARRAY_SIZE(fcc_tbl[id]), v & 7);
1010 	} else {
1011 		v >>= 3;
1012 		intval = hw_to_current(pcc_tbl[id],
1013 				       ARRAY_SIZE(pcc_tbl[id]), v & 7);
1014 	}
1015 
1016 	return intval;
1017 }
1018 
1019 /*
1020  * Returns the constant charge voltage programmed
1021  * into the charger in uV.
1022  */
1023 static int get_const_charge_voltage(struct smb347_charger *smb)
1024 {
1025 	int ret, intval;
1026 	unsigned int v;
1027 
1028 	if (!smb347_is_ps_online(smb))
1029 		return -ENODATA;
1030 
1031 	ret = regmap_read(smb->regmap, STAT_A, &v);
1032 	if (ret < 0)
1033 		return ret;
1034 
1035 	v &= STAT_A_FLOAT_VOLTAGE_MASK;
1036 	if (v > 0x3d)
1037 		v = 0x3d;
1038 
1039 	intval = 3500000 + v * 20000;
1040 
1041 	return intval;
1042 }
1043 
1044 static int smb347_get_charging_status(struct smb347_charger *smb,
1045 				      struct power_supply *psy)
1046 {
1047 	int ret, status;
1048 	unsigned int val;
1049 
1050 	if (psy->desc->type == POWER_SUPPLY_TYPE_USB) {
1051 		if (!smb->usb_online)
1052 			return POWER_SUPPLY_STATUS_DISCHARGING;
1053 	} else {
1054 		if (!smb->mains_online)
1055 			return POWER_SUPPLY_STATUS_DISCHARGING;
1056 	}
1057 
1058 	ret = regmap_read(smb->regmap, STAT_C, &val);
1059 	if (ret < 0)
1060 		return ret;
1061 
1062 	if ((val & STAT_C_CHARGER_ERROR) ||
1063 			(val & STAT_C_HOLDOFF_STAT)) {
1064 		/*
1065 		 * set to NOT CHARGING upon charger error
1066 		 * or charging has stopped.
1067 		 */
1068 		status = POWER_SUPPLY_STATUS_NOT_CHARGING;
1069 	} else {
1070 		if ((val & STAT_C_CHG_MASK) >> STAT_C_CHG_SHIFT) {
1071 			/*
1072 			 * set to charging if battery is in pre-charge,
1073 			 * fast charge or taper charging mode.
1074 			 */
1075 			status = POWER_SUPPLY_STATUS_CHARGING;
1076 		} else if (val & STAT_C_CHG_TERM) {
1077 			/*
1078 			 * set the status to FULL if battery is not in pre
1079 			 * charge, fast charge or taper charging mode AND
1080 			 * charging is terminated at least once.
1081 			 */
1082 			status = POWER_SUPPLY_STATUS_FULL;
1083 		} else {
1084 			/*
1085 			 * in this case no charger error or termination
1086 			 * occured but charging is not in progress!!!
1087 			 */
1088 			status = POWER_SUPPLY_STATUS_NOT_CHARGING;
1089 		}
1090 	}
1091 
1092 	return status;
1093 }
1094 
1095 static int smb347_get_property_locked(struct power_supply *psy,
1096 				      enum power_supply_property prop,
1097 				      union power_supply_propval *val)
1098 {
1099 	struct smb347_charger *smb = power_supply_get_drvdata(psy);
1100 	int ret;
1101 
1102 	switch (prop) {
1103 	case POWER_SUPPLY_PROP_STATUS:
1104 		ret = smb347_get_charging_status(smb, psy);
1105 		if (ret < 0)
1106 			return ret;
1107 		val->intval = ret;
1108 		break;
1109 
1110 	case POWER_SUPPLY_PROP_CHARGE_TYPE:
1111 		if (psy->desc->type == POWER_SUPPLY_TYPE_USB) {
1112 			if (!smb->usb_online)
1113 				return -ENODATA;
1114 		} else {
1115 			if (!smb->mains_online)
1116 				return -ENODATA;
1117 		}
1118 
1119 		/*
1120 		 * We handle trickle and pre-charging the same, and taper
1121 		 * and none the same.
1122 		 */
1123 		switch (smb347_charging_status(smb)) {
1124 		case 1:
1125 			val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
1126 			break;
1127 		case 2:
1128 			val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
1129 			break;
1130 		default:
1131 			val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
1132 			break;
1133 		}
1134 		break;
1135 
1136 	case POWER_SUPPLY_PROP_ONLINE:
1137 		if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
1138 			val->intval = smb->usb_online;
1139 		else
1140 			val->intval = smb->mains_online;
1141 		break;
1142 
1143 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
1144 		ret = get_const_charge_voltage(smb);
1145 		if (ret < 0)
1146 			return ret;
1147 		val->intval = ret;
1148 		break;
1149 
1150 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
1151 		ret = get_const_charge_current(smb);
1152 		if (ret < 0)
1153 			return ret;
1154 		val->intval = ret;
1155 		break;
1156 
1157 	default:
1158 		return -EINVAL;
1159 	}
1160 
1161 	return 0;
1162 }
1163 
1164 static int smb347_get_property(struct power_supply *psy,
1165 			       enum power_supply_property prop,
1166 			       union power_supply_propval *val)
1167 {
1168 	struct smb347_charger *smb = power_supply_get_drvdata(psy);
1169 	struct i2c_client *client = to_i2c_client(smb->dev);
1170 	int ret;
1171 
1172 	if (!smb->irq_unsupported)
1173 		disable_irq(client->irq);
1174 
1175 	ret = smb347_get_property_locked(psy, prop, val);
1176 
1177 	if (!smb->irq_unsupported)
1178 		enable_irq(client->irq);
1179 
1180 	return ret;
1181 }
1182 
1183 static enum power_supply_property smb347_properties[] = {
1184 	POWER_SUPPLY_PROP_STATUS,
1185 	POWER_SUPPLY_PROP_CHARGE_TYPE,
1186 	POWER_SUPPLY_PROP_ONLINE,
1187 	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
1188 	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
1189 };
1190 
1191 static bool smb347_volatile_reg(struct device *dev, unsigned int reg)
1192 {
1193 	switch (reg) {
1194 	case IRQSTAT_A:
1195 	case IRQSTAT_C:
1196 	case IRQSTAT_D:
1197 	case IRQSTAT_E:
1198 	case IRQSTAT_F:
1199 	case STAT_A:
1200 	case STAT_B:
1201 	case STAT_C:
1202 	case STAT_E:
1203 		return true;
1204 	}
1205 
1206 	return false;
1207 }
1208 
1209 static bool smb347_readable_reg(struct device *dev, unsigned int reg)
1210 {
1211 	switch (reg) {
1212 	case CFG_CHARGE_CURRENT:
1213 	case CFG_CURRENT_LIMIT:
1214 	case CFG_FLOAT_VOLTAGE:
1215 	case CFG_STAT:
1216 	case CFG_PIN:
1217 	case CFG_THERM:
1218 	case CFG_SYSOK:
1219 	case CFG_OTHER:
1220 	case CFG_OTG:
1221 	case CFG_TEMP_LIMIT:
1222 	case CFG_FAULT_IRQ:
1223 	case CFG_STATUS_IRQ:
1224 	case CFG_ADDRESS:
1225 	case CMD_A:
1226 	case CMD_B:
1227 	case CMD_C:
1228 		return true;
1229 	}
1230 
1231 	return smb347_volatile_reg(dev, reg);
1232 }
1233 
1234 static void smb347_dt_parse_dev_info(struct smb347_charger *smb)
1235 {
1236 	struct device *dev = smb->dev;
1237 
1238 	smb->soft_temp_limit_compensation =
1239 					SMB3XX_SOFT_TEMP_COMPENSATE_DEFAULT;
1240 	/*
1241 	 * These properties come from the battery info, still we need to
1242 	 * pre-initialize the values. See smb347_get_battery_info() below.
1243 	 */
1244 	smb->soft_cold_temp_limit = SMB3XX_TEMP_USE_DEFAULT;
1245 	smb->hard_cold_temp_limit = SMB3XX_TEMP_USE_DEFAULT;
1246 	smb->soft_hot_temp_limit  = SMB3XX_TEMP_USE_DEFAULT;
1247 	smb->hard_hot_temp_limit  = SMB3XX_TEMP_USE_DEFAULT;
1248 
1249 	/* Charging constraints */
1250 	device_property_read_u32(dev, "summit,fast-voltage-threshold-microvolt",
1251 				 &smb->pre_to_fast_voltage);
1252 	device_property_read_u32(dev, "summit,mains-current-limit-microamp",
1253 				 &smb->mains_current_limit);
1254 	device_property_read_u32(dev, "summit,usb-current-limit-microamp",
1255 				 &smb->usb_hc_current_limit);
1256 
1257 	/* For thermometer monitoring */
1258 	device_property_read_u32(dev, "summit,chip-temperature-threshold-celsius",
1259 				 &smb->chip_temp_threshold);
1260 	device_property_read_u32(dev, "summit,soft-compensation-method",
1261 				 &smb->soft_temp_limit_compensation);
1262 	device_property_read_u32(dev, "summit,charge-current-compensation-microamp",
1263 				 &smb->charge_current_compensation);
1264 
1265 	/* Supported charging mode */
1266 	smb->use_mains = device_property_read_bool(dev, "summit,enable-mains-charging");
1267 	smb->use_usb = device_property_read_bool(dev, "summit,enable-usb-charging");
1268 	smb->use_usb_otg = device_property_read_bool(dev, "summit,enable-otg-charging");
1269 
1270 	/* Select charging control */
1271 	device_property_read_u32(dev, "summit,enable-charge-control",
1272 				 &smb->enable_control);
1273 
1274 	/*
1275 	 * Polarity of INOK signal indicating presence of external power
1276 	 * supply connected to the charger.
1277 	 */
1278 	device_property_read_u32(dev, "summit,inok-polarity",
1279 				 &smb->inok_polarity);
1280 }
1281 
1282 static int smb347_get_battery_info(struct smb347_charger *smb)
1283 {
1284 	struct power_supply_battery_info *info;
1285 	struct power_supply *supply;
1286 	int err;
1287 
1288 	if (smb->mains)
1289 		supply = smb->mains;
1290 	else
1291 		supply = smb->usb;
1292 
1293 	err = power_supply_get_battery_info(supply, &info);
1294 	if (err == -ENXIO || err == -ENODEV)
1295 		return 0;
1296 	if (err)
1297 		return err;
1298 
1299 	if (info->constant_charge_current_max_ua != -EINVAL)
1300 		smb->max_charge_current = info->constant_charge_current_max_ua;
1301 
1302 	if (info->constant_charge_voltage_max_uv != -EINVAL)
1303 		smb->max_charge_voltage = info->constant_charge_voltage_max_uv;
1304 
1305 	if (info->precharge_current_ua != -EINVAL)
1306 		smb->pre_charge_current = info->precharge_current_ua;
1307 
1308 	if (info->charge_term_current_ua != -EINVAL)
1309 		smb->termination_current = info->charge_term_current_ua;
1310 
1311 	if (info->temp_alert_min != INT_MIN)
1312 		smb->soft_cold_temp_limit = info->temp_alert_min;
1313 
1314 	if (info->temp_alert_max != INT_MAX)
1315 		smb->soft_hot_temp_limit = info->temp_alert_max;
1316 
1317 	if (info->temp_min != INT_MIN)
1318 		smb->hard_cold_temp_limit = info->temp_min;
1319 
1320 	if (info->temp_max != INT_MAX)
1321 		smb->hard_hot_temp_limit = info->temp_max;
1322 
1323 	/* Suspend when battery temperature is outside hard limits */
1324 	if (smb->hard_cold_temp_limit != SMB3XX_TEMP_USE_DEFAULT ||
1325 	    smb->hard_hot_temp_limit != SMB3XX_TEMP_USE_DEFAULT)
1326 		smb->suspend_on_hard_temp_limit = true;
1327 
1328 	return 0;
1329 }
1330 
1331 static int smb347_usb_vbus_get_current_limit(struct regulator_dev *rdev)
1332 {
1333 	struct smb347_charger *smb = rdev_get_drvdata(rdev);
1334 	unsigned int val;
1335 	int ret;
1336 
1337 	ret = regmap_read(smb->regmap, CFG_OTG, &val);
1338 	if (ret < 0)
1339 		return ret;
1340 
1341 	/*
1342 	 * It's unknown what happens if this bit is unset due to lack of
1343 	 * access to the datasheet, assume it's limit-enable.
1344 	 */
1345 	if (!(val & CFG_OTG_CURRENT_LIMIT_250mA))
1346 		return 0;
1347 
1348 	return val & CFG_OTG_CURRENT_LIMIT_750mA ? 750000 : 250000;
1349 }
1350 
1351 static int smb347_usb_vbus_set_new_current_limit(struct smb347_charger *smb,
1352 						 int max_uA)
1353 {
1354 	const unsigned int mask = CFG_OTG_CURRENT_LIMIT_750mA |
1355 				  CFG_OTG_CURRENT_LIMIT_250mA;
1356 	unsigned int val = CFG_OTG_CURRENT_LIMIT_250mA;
1357 	int ret;
1358 
1359 	if (max_uA >= 750000)
1360 		val |= CFG_OTG_CURRENT_LIMIT_750mA;
1361 
1362 	ret = regmap_update_bits(smb->regmap, CFG_OTG, mask, val);
1363 	if (ret < 0)
1364 		dev_err(smb->dev, "failed to change USB current limit\n");
1365 
1366 	return ret;
1367 }
1368 
1369 static int smb347_usb_vbus_set_current_limit(struct regulator_dev *rdev,
1370 					     int min_uA, int max_uA)
1371 {
1372 	struct smb347_charger *smb = rdev_get_drvdata(rdev);
1373 	int ret;
1374 
1375 	ret = smb347_set_writable(smb, true, true);
1376 	if (ret < 0)
1377 		return ret;
1378 
1379 	ret = smb347_usb_vbus_set_new_current_limit(smb, max_uA);
1380 	smb347_set_writable(smb, false, true);
1381 
1382 	return ret;
1383 }
1384 
1385 static int smb347_usb_vbus_regulator_enable(struct regulator_dev *rdev)
1386 {
1387 	struct smb347_charger *smb = rdev_get_drvdata(rdev);
1388 	int ret, max_uA;
1389 
1390 	ret = smb347_set_writable(smb, true, true);
1391 	if (ret < 0)
1392 		return ret;
1393 
1394 	smb347_charging_disable(smb);
1395 
1396 	if (device_property_read_bool(&rdev->dev, "summit,needs-inok-toggle")) {
1397 		unsigned int sysok = 0;
1398 
1399 		if (smb->inok_polarity == SMB3XX_SYSOK_INOK_ACTIVE_LOW)
1400 			sysok = CFG_SYSOK_INOK_ACTIVE_HIGH;
1401 
1402 		/*
1403 		 * VBUS won't be powered if INOK is active, so we need to
1404 		 * manually disable INOK on some platforms.
1405 		 */
1406 		ret = regmap_update_bits(smb->regmap, CFG_SYSOK,
1407 					 CFG_SYSOK_INOK_ACTIVE_HIGH, sysok);
1408 		if (ret < 0) {
1409 			dev_err(smb->dev, "failed to disable INOK\n");
1410 			goto done;
1411 		}
1412 	}
1413 
1414 	ret = smb347_usb_vbus_get_current_limit(rdev);
1415 	if (ret < 0) {
1416 		dev_err(smb->dev, "failed to get USB VBUS current limit\n");
1417 		goto done;
1418 	}
1419 
1420 	max_uA = ret;
1421 
1422 	ret = smb347_usb_vbus_set_new_current_limit(smb, 250000);
1423 	if (ret < 0) {
1424 		dev_err(smb->dev, "failed to preset USB VBUS current limit\n");
1425 		goto done;
1426 	}
1427 
1428 	ret = regmap_set_bits(smb->regmap, CMD_A, CMD_A_OTG_ENABLED);
1429 	if (ret < 0) {
1430 		dev_err(smb->dev, "failed to enable USB VBUS\n");
1431 		goto done;
1432 	}
1433 
1434 	smb->usb_vbus_enabled = true;
1435 
1436 	ret = smb347_usb_vbus_set_new_current_limit(smb, max_uA);
1437 	if (ret < 0) {
1438 		dev_err(smb->dev, "failed to restore USB VBUS current limit\n");
1439 		goto done;
1440 	}
1441 done:
1442 	smb347_set_writable(smb, false, true);
1443 
1444 	return ret;
1445 }
1446 
1447 static int smb347_usb_vbus_regulator_disable(struct regulator_dev *rdev)
1448 {
1449 	struct smb347_charger *smb = rdev_get_drvdata(rdev);
1450 	int ret;
1451 
1452 	ret = smb347_set_writable(smb, true, true);
1453 	if (ret < 0)
1454 		return ret;
1455 
1456 	ret = regmap_clear_bits(smb->regmap, CMD_A, CMD_A_OTG_ENABLED);
1457 	if (ret < 0) {
1458 		dev_err(smb->dev, "failed to disable USB VBUS\n");
1459 		goto done;
1460 	}
1461 
1462 	smb->usb_vbus_enabled = false;
1463 
1464 	if (device_property_read_bool(&rdev->dev, "summit,needs-inok-toggle")) {
1465 		unsigned int sysok = 0;
1466 
1467 		if (smb->inok_polarity == SMB3XX_SYSOK_INOK_ACTIVE_HIGH)
1468 			sysok = CFG_SYSOK_INOK_ACTIVE_HIGH;
1469 
1470 		ret = regmap_update_bits(smb->regmap, CFG_SYSOK,
1471 					 CFG_SYSOK_INOK_ACTIVE_HIGH, sysok);
1472 		if (ret < 0) {
1473 			dev_err(smb->dev, "failed to enable INOK\n");
1474 			goto done;
1475 		}
1476 	}
1477 
1478 	smb347_start_stop_charging(smb);
1479 done:
1480 	smb347_set_writable(smb, false, true);
1481 
1482 	return ret;
1483 }
1484 
1485 static const struct regmap_config smb347_regmap = {
1486 	.reg_bits	= 8,
1487 	.val_bits	= 8,
1488 	.max_register	= SMB347_MAX_REGISTER,
1489 	.volatile_reg	= smb347_volatile_reg,
1490 	.readable_reg	= smb347_readable_reg,
1491 	.cache_type	= REGCACHE_RBTREE,
1492 };
1493 
1494 static const struct regulator_ops smb347_usb_vbus_regulator_ops = {
1495 	.is_enabled	= regulator_is_enabled_regmap,
1496 	.enable		= smb347_usb_vbus_regulator_enable,
1497 	.disable	= smb347_usb_vbus_regulator_disable,
1498 	.get_current_limit = smb347_usb_vbus_get_current_limit,
1499 	.set_current_limit = smb347_usb_vbus_set_current_limit,
1500 };
1501 
1502 static const struct power_supply_desc smb347_mains_desc = {
1503 	.name		= "smb347-mains",
1504 	.type		= POWER_SUPPLY_TYPE_MAINS,
1505 	.get_property	= smb347_get_property,
1506 	.properties	= smb347_properties,
1507 	.num_properties	= ARRAY_SIZE(smb347_properties),
1508 };
1509 
1510 static const struct power_supply_desc smb347_usb_desc = {
1511 	.name		= "smb347-usb",
1512 	.type		= POWER_SUPPLY_TYPE_USB,
1513 	.get_property	= smb347_get_property,
1514 	.properties	= smb347_properties,
1515 	.num_properties	= ARRAY_SIZE(smb347_properties),
1516 };
1517 
1518 static const struct regulator_desc smb347_usb_vbus_regulator_desc = {
1519 	.name		= "smb347-usb-vbus",
1520 	.of_match	= of_match_ptr("usb-vbus"),
1521 	.ops		= &smb347_usb_vbus_regulator_ops,
1522 	.type		= REGULATOR_VOLTAGE,
1523 	.owner		= THIS_MODULE,
1524 	.enable_reg	= CMD_A,
1525 	.enable_mask	= CMD_A_OTG_ENABLED,
1526 	.enable_val	= CMD_A_OTG_ENABLED,
1527 	.fixed_uV	= 5000000,
1528 	.n_voltages	= 1,
1529 };
1530 
1531 static int smb347_probe(struct i2c_client *client,
1532 			const struct i2c_device_id *id)
1533 {
1534 	struct power_supply_config mains_usb_cfg = {};
1535 	struct regulator_config usb_rdev_cfg = {};
1536 	struct device *dev = &client->dev;
1537 	struct smb347_charger *smb;
1538 	int ret;
1539 
1540 	smb = devm_kzalloc(dev, sizeof(*smb), GFP_KERNEL);
1541 	if (!smb)
1542 		return -ENOMEM;
1543 	smb->dev = &client->dev;
1544 	smb->id = id->driver_data;
1545 	i2c_set_clientdata(client, smb);
1546 
1547 	smb347_dt_parse_dev_info(smb);
1548 	if (!smb->use_mains && !smb->use_usb)
1549 		return -EINVAL;
1550 
1551 	smb->regmap = devm_regmap_init_i2c(client, &smb347_regmap);
1552 	if (IS_ERR(smb->regmap))
1553 		return PTR_ERR(smb->regmap);
1554 
1555 	mains_usb_cfg.drv_data = smb;
1556 	mains_usb_cfg.of_node = dev->of_node;
1557 	if (smb->use_mains) {
1558 		smb->mains = devm_power_supply_register(dev, &smb347_mains_desc,
1559 							&mains_usb_cfg);
1560 		if (IS_ERR(smb->mains))
1561 			return PTR_ERR(smb->mains);
1562 	}
1563 
1564 	if (smb->use_usb) {
1565 		smb->usb = devm_power_supply_register(dev, &smb347_usb_desc,
1566 						      &mains_usb_cfg);
1567 		if (IS_ERR(smb->usb))
1568 			return PTR_ERR(smb->usb);
1569 	}
1570 
1571 	ret = smb347_get_battery_info(smb);
1572 	if (ret)
1573 		return ret;
1574 
1575 	ret = smb347_hw_init(smb);
1576 	if (ret < 0)
1577 		return ret;
1578 
1579 	ret = smb347_irq_init(smb, client);
1580 	if (ret)
1581 		return ret;
1582 
1583 	usb_rdev_cfg.dev = dev;
1584 	usb_rdev_cfg.driver_data = smb;
1585 	usb_rdev_cfg.regmap = smb->regmap;
1586 
1587 	smb->usb_rdev = devm_regulator_register(dev,
1588 						&smb347_usb_vbus_regulator_desc,
1589 						&usb_rdev_cfg);
1590 	if (IS_ERR(smb->usb_rdev)) {
1591 		smb347_irq_disable(smb);
1592 		return PTR_ERR(smb->usb_rdev);
1593 	}
1594 
1595 	return 0;
1596 }
1597 
1598 static void smb347_remove(struct i2c_client *client)
1599 {
1600 	struct smb347_charger *smb = i2c_get_clientdata(client);
1601 
1602 	smb347_usb_vbus_regulator_disable(smb->usb_rdev);
1603 	smb347_irq_disable(smb);
1604 }
1605 
1606 static void smb347_shutdown(struct i2c_client *client)
1607 {
1608 	smb347_remove(client);
1609 }
1610 
1611 static const struct i2c_device_id smb347_id[] = {
1612 	{ "smb345", SMB345 },
1613 	{ "smb347", SMB347 },
1614 	{ "smb358", SMB358 },
1615 	{ },
1616 };
1617 MODULE_DEVICE_TABLE(i2c, smb347_id);
1618 
1619 static const struct of_device_id smb3xx_of_match[] = {
1620 	{ .compatible = "summit,smb345" },
1621 	{ .compatible = "summit,smb347" },
1622 	{ .compatible = "summit,smb358" },
1623 	{ },
1624 };
1625 MODULE_DEVICE_TABLE(of, smb3xx_of_match);
1626 
1627 static struct i2c_driver smb347_driver = {
1628 	.driver = {
1629 		.name = "smb347",
1630 		.of_match_table = smb3xx_of_match,
1631 	},
1632 	.probe = smb347_probe,
1633 	.remove = smb347_remove,
1634 	.shutdown = smb347_shutdown,
1635 	.id_table = smb347_id,
1636 };
1637 module_i2c_driver(smb347_driver);
1638 
1639 MODULE_AUTHOR("Bruce E. Robertson <bruce.e.robertson@intel.com>");
1640 MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
1641 MODULE_DESCRIPTION("SMB347 battery charger driver");
1642 MODULE_LICENSE("GPL");
1643