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smb347-charger: Clean up battery attributes
[deliverable/linux.git] / drivers / power / smb347-charger.c
1 /*
2 * Summit Microelectronics SMB347 Battery Charger Driver
3 *
4 * Copyright (C) 2011, Intel Corporation
5 *
6 * Authors: Bruce E. Robertson <bruce.e.robertson@intel.com>
7 * Mika Westerberg <mika.westerberg@linux.intel.com>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14 #include <linux/gpio.h>
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/init.h>
18 #include <linux/interrupt.h>
19 #include <linux/i2c.h>
20 #include <linux/mutex.h>
21 #include <linux/power_supply.h>
22 #include <linux/power/smb347-charger.h>
23 #include <linux/regmap.h>
24
25 /*
26 * Configuration registers. These are mirrored to volatile RAM and can be
27 * written once %CMD_A_ALLOW_WRITE is set in %CMD_A register. They will be
28 * reloaded from non-volatile registers after POR.
29 */
30 #define CFG_CHARGE_CURRENT 0x00
31 #define CFG_CHARGE_CURRENT_FCC_MASK 0xe0
32 #define CFG_CHARGE_CURRENT_FCC_SHIFT 5
33 #define CFG_CHARGE_CURRENT_PCC_MASK 0x18
34 #define CFG_CHARGE_CURRENT_PCC_SHIFT 3
35 #define CFG_CHARGE_CURRENT_TC_MASK 0x07
36 #define CFG_CURRENT_LIMIT 0x01
37 #define CFG_CURRENT_LIMIT_DC_MASK 0xf0
38 #define CFG_CURRENT_LIMIT_DC_SHIFT 4
39 #define CFG_CURRENT_LIMIT_USB_MASK 0x0f
40 #define CFG_FLOAT_VOLTAGE 0x03
41 #define CFG_FLOAT_VOLTAGE_FLOAT_MASK 0x3f
42 #define CFG_FLOAT_VOLTAGE_THRESHOLD_MASK 0xc0
43 #define CFG_FLOAT_VOLTAGE_THRESHOLD_SHIFT 6
44 #define CFG_STAT 0x05
45 #define CFG_STAT_DISABLED BIT(5)
46 #define CFG_STAT_ACTIVE_HIGH BIT(7)
47 #define CFG_PIN 0x06
48 #define CFG_PIN_EN_CTRL_MASK 0x60
49 #define CFG_PIN_EN_CTRL_ACTIVE_HIGH 0x40
50 #define CFG_PIN_EN_CTRL_ACTIVE_LOW 0x60
51 #define CFG_PIN_EN_APSD_IRQ BIT(1)
52 #define CFG_PIN_EN_CHARGER_ERROR BIT(2)
53 #define CFG_THERM 0x07
54 #define CFG_THERM_SOFT_HOT_COMPENSATION_MASK 0x03
55 #define CFG_THERM_SOFT_HOT_COMPENSATION_SHIFT 0
56 #define CFG_THERM_SOFT_COLD_COMPENSATION_MASK 0x0c
57 #define CFG_THERM_SOFT_COLD_COMPENSATION_SHIFT 2
58 #define CFG_THERM_MONITOR_DISABLED BIT(4)
59 #define CFG_SYSOK 0x08
60 #define CFG_SYSOK_SUSPEND_HARD_LIMIT_DISABLED BIT(2)
61 #define CFG_OTHER 0x09
62 #define CFG_OTHER_RID_MASK 0xc0
63 #define CFG_OTHER_RID_ENABLED_AUTO_OTG 0xc0
64 #define CFG_OTG 0x0a
65 #define CFG_OTG_TEMP_THRESHOLD_MASK 0x30
66 #define CFG_OTG_TEMP_THRESHOLD_SHIFT 4
67 #define CFG_OTG_CC_COMPENSATION_MASK 0xc0
68 #define CFG_OTG_CC_COMPENSATION_SHIFT 6
69 #define CFG_TEMP_LIMIT 0x0b
70 #define CFG_TEMP_LIMIT_SOFT_HOT_MASK 0x03
71 #define CFG_TEMP_LIMIT_SOFT_HOT_SHIFT 0
72 #define CFG_TEMP_LIMIT_SOFT_COLD_MASK 0x0c
73 #define CFG_TEMP_LIMIT_SOFT_COLD_SHIFT 2
74 #define CFG_TEMP_LIMIT_HARD_HOT_MASK 0x30
75 #define CFG_TEMP_LIMIT_HARD_HOT_SHIFT 4
76 #define CFG_TEMP_LIMIT_HARD_COLD_MASK 0xc0
77 #define CFG_TEMP_LIMIT_HARD_COLD_SHIFT 6
78 #define CFG_FAULT_IRQ 0x0c
79 #define CFG_FAULT_IRQ_DCIN_UV BIT(2)
80 #define CFG_STATUS_IRQ 0x0d
81 #define CFG_STATUS_IRQ_TERMINATION_OR_TAPER BIT(4)
82 #define CFG_ADDRESS 0x0e
83
84 /* Command registers */
85 #define CMD_A 0x30
86 #define CMD_A_CHG_ENABLED BIT(1)
87 #define CMD_A_SUSPEND_ENABLED BIT(2)
88 #define CMD_A_ALLOW_WRITE BIT(7)
89 #define CMD_B 0x31
90 #define CMD_C 0x33
91
92 /* Interrupt Status registers */
93 #define IRQSTAT_A 0x35
94 #define IRQSTAT_C 0x37
95 #define IRQSTAT_C_TERMINATION_STAT BIT(0)
96 #define IRQSTAT_C_TERMINATION_IRQ BIT(1)
97 #define IRQSTAT_C_TAPER_IRQ BIT(3)
98 #define IRQSTAT_E 0x39
99 #define IRQSTAT_E_USBIN_UV_STAT BIT(0)
100 #define IRQSTAT_E_USBIN_UV_IRQ BIT(1)
101 #define IRQSTAT_E_DCIN_UV_STAT BIT(4)
102 #define IRQSTAT_E_DCIN_UV_IRQ BIT(5)
103 #define IRQSTAT_F 0x3a
104
105 /* Status registers */
106 #define STAT_A 0x3b
107 #define STAT_A_FLOAT_VOLTAGE_MASK 0x3f
108 #define STAT_B 0x3c
109 #define STAT_C 0x3d
110 #define STAT_C_CHG_ENABLED BIT(0)
111 #define STAT_C_CHG_MASK 0x06
112 #define STAT_C_CHG_SHIFT 1
113 #define STAT_C_CHARGER_ERROR BIT(6)
114 #define STAT_E 0x3f
115
116 #define SMB347_MAX_REGISTER 0x3f
117
118 /**
119 * struct smb347_charger - smb347 charger instance
120 * @lock: protects concurrent access to online variables
121 * @dev: pointer to device
122 * @regmap: pointer to driver regmap
123 * @mains: power_supply instance for AC/DC power
124 * @usb: power_supply instance for USB power
125 * @battery: power_supply instance for battery
126 * @mains_online: is AC/DC input connected
127 * @usb_online: is USB input connected
128 * @charging_enabled: is charging enabled
129 * @pdata: pointer to platform data
130 */
131 struct smb347_charger {
132 struct mutex lock;
133 struct device *dev;
134 struct regmap *regmap;
135 struct power_supply mains;
136 struct power_supply usb;
137 struct power_supply battery;
138 bool mains_online;
139 bool usb_online;
140 bool charging_enabled;
141 const struct smb347_charger_platform_data *pdata;
142 };
143
144 /* Fast charge current in uA */
145 static const unsigned int fcc_tbl[] = {
146 700000,
147 900000,
148 1200000,
149 1500000,
150 1800000,
151 2000000,
152 2200000,
153 2500000,
154 };
155
156 /* Pre-charge current in uA */
157 static const unsigned int pcc_tbl[] = {
158 100000,
159 150000,
160 200000,
161 250000,
162 };
163
164 /* Termination current in uA */
165 static const unsigned int tc_tbl[] = {
166 37500,
167 50000,
168 100000,
169 150000,
170 200000,
171 250000,
172 500000,
173 600000,
174 };
175
176 /* Input current limit in uA */
177 static const unsigned int icl_tbl[] = {
178 300000,
179 500000,
180 700000,
181 900000,
182 1200000,
183 1500000,
184 1800000,
185 2000000,
186 2200000,
187 2500000,
188 };
189
190 /* Charge current compensation in uA */
191 static const unsigned int ccc_tbl[] = {
192 250000,
193 700000,
194 900000,
195 1200000,
196 };
197
198 /* Convert current to register value using lookup table */
199 static int current_to_hw(const unsigned int *tbl, size_t size, unsigned int val)
200 {
201 size_t i;
202
203 for (i = 0; i < size; i++)
204 if (val < tbl[i])
205 break;
206 return i > 0 ? i - 1 : -EINVAL;
207 }
208
209 /**
210 * smb347_update_ps_status - refreshes the power source status
211 * @smb: pointer to smb347 charger instance
212 *
213 * Function checks whether any power source is connected to the charger and
214 * updates internal state accordingly. If there is a change to previous state
215 * function returns %1, otherwise %0 and negative errno in case of errror.
216 */
217 static int smb347_update_ps_status(struct smb347_charger *smb)
218 {
219 bool usb = false;
220 bool dc = false;
221 unsigned int val;
222 int ret;
223
224 ret = regmap_read(smb->regmap, IRQSTAT_E, &val);
225 if (ret < 0)
226 return ret;
227
228 /*
229 * Dc and usb are set depending on whether they are enabled in
230 * platform data _and_ whether corresponding undervoltage is set.
231 */
232 if (smb->pdata->use_mains)
233 dc = !(val & IRQSTAT_E_DCIN_UV_STAT);
234 if (smb->pdata->use_usb)
235 usb = !(val & IRQSTAT_E_USBIN_UV_STAT);
236
237 mutex_lock(&smb->lock);
238 ret = smb->mains_online != dc || smb->usb_online != usb;
239 smb->mains_online = dc;
240 smb->usb_online = usb;
241 mutex_unlock(&smb->lock);
242
243 return ret;
244 }
245
246 /*
247 * smb347_is_ps_online - returns whether input power source is connected
248 * @smb: pointer to smb347 charger instance
249 *
250 * Returns %true if input power source is connected. Note that this is
251 * dependent on what platform has configured for usable power sources. For
252 * example if USB is disabled, this will return %false even if the USB cable
253 * is connected.
254 */
255 static bool smb347_is_ps_online(struct smb347_charger *smb)
256 {
257 bool ret;
258
259 mutex_lock(&smb->lock);
260 ret = smb->usb_online || smb->mains_online;
261 mutex_unlock(&smb->lock);
262
263 return ret;
264 }
265
266 /**
267 * smb347_charging_status - returns status of charging
268 * @smb: pointer to smb347 charger instance
269 *
270 * Function returns charging status. %0 means no charging is in progress,
271 * %1 means pre-charging, %2 fast-charging and %3 taper-charging.
272 */
273 static int smb347_charging_status(struct smb347_charger *smb)
274 {
275 unsigned int val;
276 int ret;
277
278 if (!smb347_is_ps_online(smb))
279 return 0;
280
281 ret = regmap_read(smb->regmap, STAT_C, &val);
282 if (ret < 0)
283 return 0;
284
285 return (val & STAT_C_CHG_MASK) >> STAT_C_CHG_SHIFT;
286 }
287
288 static int smb347_charging_set(struct smb347_charger *smb, bool enable)
289 {
290 int ret = 0;
291
292 if (smb->pdata->enable_control != SMB347_CHG_ENABLE_SW) {
293 dev_dbg(smb->dev, "charging enable/disable in SW disabled\n");
294 return 0;
295 }
296
297 mutex_lock(&smb->lock);
298 if (smb->charging_enabled != enable) {
299 ret = regmap_update_bits(smb->regmap, CMD_A, CMD_A_CHG_ENABLED,
300 enable ? CMD_A_CHG_ENABLED : 0);
301 if (!ret)
302 smb->charging_enabled = enable;
303 }
304 mutex_unlock(&smb->lock);
305 return ret;
306 }
307
308 static inline int smb347_charging_enable(struct smb347_charger *smb)
309 {
310 return smb347_charging_set(smb, true);
311 }
312
313 static inline int smb347_charging_disable(struct smb347_charger *smb)
314 {
315 return smb347_charging_set(smb, false);
316 }
317
318 static int smb347_start_stop_charging(struct smb347_charger *smb)
319 {
320 int ret;
321
322 /*
323 * Depending on whether valid power source is connected or not, we
324 * disable or enable the charging. We do it manually because it
325 * depends on how the platform has configured the valid inputs.
326 */
327 if (smb347_is_ps_online(smb)) {
328 ret = smb347_charging_enable(smb);
329 if (ret < 0)
330 dev_err(smb->dev, "failed to enable charging\n");
331 } else {
332 ret = smb347_charging_disable(smb);
333 if (ret < 0)
334 dev_err(smb->dev, "failed to disable charging\n");
335 }
336
337 return ret;
338 }
339
340 static int smb347_set_charge_current(struct smb347_charger *smb)
341 {
342 int ret;
343
344 if (smb->pdata->max_charge_current) {
345 ret = current_to_hw(fcc_tbl, ARRAY_SIZE(fcc_tbl),
346 smb->pdata->max_charge_current);
347 if (ret < 0)
348 return ret;
349
350 ret = regmap_update_bits(smb->regmap, CFG_CHARGE_CURRENT,
351 CFG_CHARGE_CURRENT_FCC_MASK,
352 ret << CFG_CHARGE_CURRENT_FCC_SHIFT);
353 if (ret < 0)
354 return ret;
355 }
356
357 if (smb->pdata->pre_charge_current) {
358 ret = current_to_hw(pcc_tbl, ARRAY_SIZE(pcc_tbl),
359 smb->pdata->pre_charge_current);
360 if (ret < 0)
361 return ret;
362
363 ret = regmap_update_bits(smb->regmap, CFG_CHARGE_CURRENT,
364 CFG_CHARGE_CURRENT_PCC_MASK,
365 ret << CFG_CHARGE_CURRENT_PCC_SHIFT);
366 if (ret < 0)
367 return ret;
368 }
369
370 if (smb->pdata->termination_current) {
371 ret = current_to_hw(tc_tbl, ARRAY_SIZE(tc_tbl),
372 smb->pdata->termination_current);
373 if (ret < 0)
374 return ret;
375
376 ret = regmap_update_bits(smb->regmap, CFG_CHARGE_CURRENT,
377 CFG_CHARGE_CURRENT_TC_MASK, ret);
378 if (ret < 0)
379 return ret;
380 }
381
382 return 0;
383 }
384
385 static int smb347_set_current_limits(struct smb347_charger *smb)
386 {
387 int ret;
388
389 if (smb->pdata->mains_current_limit) {
390 ret = current_to_hw(icl_tbl, ARRAY_SIZE(icl_tbl),
391 smb->pdata->mains_current_limit);
392 if (ret < 0)
393 return ret;
394
395 ret = regmap_update_bits(smb->regmap, CFG_CURRENT_LIMIT,
396 CFG_CURRENT_LIMIT_DC_MASK,
397 ret << CFG_CURRENT_LIMIT_DC_SHIFT);
398 if (ret < 0)
399 return ret;
400 }
401
402 if (smb->pdata->usb_hc_current_limit) {
403 ret = current_to_hw(icl_tbl, ARRAY_SIZE(icl_tbl),
404 smb->pdata->usb_hc_current_limit);
405 if (ret < 0)
406 return ret;
407
408 ret = regmap_update_bits(smb->regmap, CFG_CURRENT_LIMIT,
409 CFG_CURRENT_LIMIT_USB_MASK, ret);
410 if (ret < 0)
411 return ret;
412 }
413
414 return 0;
415 }
416
417 static int smb347_set_voltage_limits(struct smb347_charger *smb)
418 {
419 int ret;
420
421 if (smb->pdata->pre_to_fast_voltage) {
422 ret = smb->pdata->pre_to_fast_voltage;
423
424 /* uV */
425 ret = clamp_val(ret, 2400000, 3000000) - 2400000;
426 ret /= 200000;
427
428 ret = regmap_update_bits(smb->regmap, CFG_FLOAT_VOLTAGE,
429 CFG_FLOAT_VOLTAGE_THRESHOLD_MASK,
430 ret << CFG_FLOAT_VOLTAGE_THRESHOLD_SHIFT);
431 if (ret < 0)
432 return ret;
433 }
434
435 if (smb->pdata->max_charge_voltage) {
436 ret = smb->pdata->max_charge_voltage;
437
438 /* uV */
439 ret = clamp_val(ret, 3500000, 4500000) - 3500000;
440 ret /= 20000;
441
442 ret = regmap_update_bits(smb->regmap, CFG_FLOAT_VOLTAGE,
443 CFG_FLOAT_VOLTAGE_FLOAT_MASK, ret);
444 if (ret < 0)
445 return ret;
446 }
447
448 return 0;
449 }
450
451 static int smb347_set_temp_limits(struct smb347_charger *smb)
452 {
453 bool enable_therm_monitor = false;
454 int ret = 0;
455 int val;
456
457 if (smb->pdata->chip_temp_threshold) {
458 val = smb->pdata->chip_temp_threshold;
459
460 /* degree C */
461 val = clamp_val(val, 100, 130) - 100;
462 val /= 10;
463
464 ret = regmap_update_bits(smb->regmap, CFG_OTG,
465 CFG_OTG_TEMP_THRESHOLD_MASK,
466 val << CFG_OTG_TEMP_THRESHOLD_SHIFT);
467 if (ret < 0)
468 return ret;
469 }
470
471 if (smb->pdata->soft_cold_temp_limit != SMB347_TEMP_USE_DEFAULT) {
472 val = smb->pdata->soft_cold_temp_limit;
473
474 val = clamp_val(val, 0, 15);
475 val /= 5;
476 /* this goes from higher to lower so invert the value */
477 val = ~val & 0x3;
478
479 ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
480 CFG_TEMP_LIMIT_SOFT_COLD_MASK,
481 val << CFG_TEMP_LIMIT_SOFT_COLD_SHIFT);
482 if (ret < 0)
483 return ret;
484
485 enable_therm_monitor = true;
486 }
487
488 if (smb->pdata->soft_hot_temp_limit != SMB347_TEMP_USE_DEFAULT) {
489 val = smb->pdata->soft_hot_temp_limit;
490
491 val = clamp_val(val, 40, 55) - 40;
492 val /= 5;
493
494 ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
495 CFG_TEMP_LIMIT_SOFT_HOT_MASK,
496 val << CFG_TEMP_LIMIT_SOFT_HOT_SHIFT);
497 if (ret < 0)
498 return ret;
499
500 enable_therm_monitor = true;
501 }
502
503 if (smb->pdata->hard_cold_temp_limit != SMB347_TEMP_USE_DEFAULT) {
504 val = smb->pdata->hard_cold_temp_limit;
505
506 val = clamp_val(val, -5, 10) + 5;
507 val /= 5;
508 /* this goes from higher to lower so invert the value */
509 val = ~val & 0x3;
510
511 ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
512 CFG_TEMP_LIMIT_HARD_COLD_MASK,
513 val << CFG_TEMP_LIMIT_HARD_COLD_SHIFT);
514 if (ret < 0)
515 return ret;
516
517 enable_therm_monitor = true;
518 }
519
520 if (smb->pdata->hard_hot_temp_limit != SMB347_TEMP_USE_DEFAULT) {
521 val = smb->pdata->hard_hot_temp_limit;
522
523 val = clamp_val(val, 50, 65) - 50;
524 val /= 5;
525
526 ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
527 CFG_TEMP_LIMIT_HARD_HOT_MASK,
528 val << CFG_TEMP_LIMIT_HARD_HOT_SHIFT);
529 if (ret < 0)
530 return ret;
531
532 enable_therm_monitor = true;
533 }
534
535 /*
536 * If any of the temperature limits are set, we also enable the
537 * thermistor monitoring.
538 *
539 * When soft limits are hit, the device will start to compensate
540 * current and/or voltage depending on the configuration.
541 *
542 * When hard limit is hit, the device will suspend charging
543 * depending on the configuration.
544 */
545 if (enable_therm_monitor) {
546 ret = regmap_update_bits(smb->regmap, CFG_THERM,
547 CFG_THERM_MONITOR_DISABLED, 0);
548 if (ret < 0)
549 return ret;
550 }
551
552 if (smb->pdata->suspend_on_hard_temp_limit) {
553 ret = regmap_update_bits(smb->regmap, CFG_SYSOK,
554 CFG_SYSOK_SUSPEND_HARD_LIMIT_DISABLED, 0);
555 if (ret < 0)
556 return ret;
557 }
558
559 if (smb->pdata->soft_temp_limit_compensation !=
560 SMB347_SOFT_TEMP_COMPENSATE_DEFAULT) {
561 val = smb->pdata->soft_temp_limit_compensation & 0x3;
562
563 ret = regmap_update_bits(smb->regmap, CFG_THERM,
564 CFG_THERM_SOFT_HOT_COMPENSATION_MASK,
565 val << CFG_THERM_SOFT_HOT_COMPENSATION_SHIFT);
566 if (ret < 0)
567 return ret;
568
569 ret = regmap_update_bits(smb->regmap, CFG_THERM,
570 CFG_THERM_SOFT_COLD_COMPENSATION_MASK,
571 val << CFG_THERM_SOFT_COLD_COMPENSATION_SHIFT);
572 if (ret < 0)
573 return ret;
574 }
575
576 if (smb->pdata->charge_current_compensation) {
577 val = current_to_hw(ccc_tbl, ARRAY_SIZE(ccc_tbl),
578 smb->pdata->charge_current_compensation);
579 if (val < 0)
580 return val;
581
582 ret = regmap_update_bits(smb->regmap, CFG_OTG,
583 CFG_OTG_CC_COMPENSATION_MASK,
584 (val & 0x3) << CFG_OTG_CC_COMPENSATION_SHIFT);
585 if (ret < 0)
586 return ret;
587 }
588
589 return ret;
590 }
591
592 /*
593 * smb347_set_writable - enables/disables writing to non-volatile registers
594 * @smb: pointer to smb347 charger instance
595 *
596 * You can enable/disable writing to the non-volatile configuration
597 * registers by calling this function.
598 *
599 * Returns %0 on success and negative errno in case of failure.
600 */
601 static int smb347_set_writable(struct smb347_charger *smb, bool writable)
602 {
603 return regmap_update_bits(smb->regmap, CMD_A, CMD_A_ALLOW_WRITE,
604 writable ? CMD_A_ALLOW_WRITE : 0);
605 }
606
607 static int smb347_hw_init(struct smb347_charger *smb)
608 {
609 unsigned int val;
610 int ret;
611
612 ret = smb347_set_writable(smb, true);
613 if (ret < 0)
614 return ret;
615
616 /*
617 * Program the platform specific configuration values to the device
618 * first.
619 */
620 ret = smb347_set_charge_current(smb);
621 if (ret < 0)
622 goto fail;
623
624 ret = smb347_set_current_limits(smb);
625 if (ret < 0)
626 goto fail;
627
628 ret = smb347_set_voltage_limits(smb);
629 if (ret < 0)
630 goto fail;
631
632 ret = smb347_set_temp_limits(smb);
633 if (ret < 0)
634 goto fail;
635
636 /* If USB charging is disabled we put the USB in suspend mode */
637 if (!smb->pdata->use_usb) {
638 ret = regmap_update_bits(smb->regmap, CMD_A,
639 CMD_A_SUSPEND_ENABLED,
640 CMD_A_SUSPEND_ENABLED);
641 if (ret < 0)
642 goto fail;
643 }
644
645 /*
646 * If configured by platform data, we enable hardware Auto-OTG
647 * support for driving VBUS. Otherwise we disable it.
648 */
649 ret = regmap_update_bits(smb->regmap, CFG_OTHER, CFG_OTHER_RID_MASK,
650 smb->pdata->use_usb_otg ? CFG_OTHER_RID_ENABLED_AUTO_OTG : 0);
651 if (ret < 0)
652 goto fail;
653
654 /*
655 * Make the charging functionality controllable by a write to the
656 * command register unless pin control is specified in the platform
657 * data.
658 */
659 switch (smb->pdata->enable_control) {
660 case SMB347_CHG_ENABLE_PIN_ACTIVE_LOW:
661 val = CFG_PIN_EN_CTRL_ACTIVE_LOW;
662 break;
663 case SMB347_CHG_ENABLE_PIN_ACTIVE_HIGH:
664 val = CFG_PIN_EN_CTRL_ACTIVE_HIGH;
665 break;
666 default:
667 val = 0;
668 break;
669 }
670
671 ret = regmap_update_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_CTRL_MASK,
672 val);
673 if (ret < 0)
674 goto fail;
675
676 /* Disable Automatic Power Source Detection (APSD) interrupt. */
677 ret = regmap_update_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_APSD_IRQ, 0);
678 if (ret < 0)
679 goto fail;
680
681 ret = smb347_update_ps_status(smb);
682 if (ret < 0)
683 goto fail;
684
685 ret = smb347_start_stop_charging(smb);
686
687 fail:
688 smb347_set_writable(smb, false);
689 return ret;
690 }
691
692 static irqreturn_t smb347_interrupt(int irq, void *data)
693 {
694 struct smb347_charger *smb = data;
695 unsigned int stat_c, irqstat_e, irqstat_c;
696 bool handled = false;
697 int ret;
698
699 ret = regmap_read(smb->regmap, STAT_C, &stat_c);
700 if (ret < 0) {
701 dev_warn(smb->dev, "reading STAT_C failed\n");
702 return IRQ_NONE;
703 }
704
705 ret = regmap_read(smb->regmap, IRQSTAT_C, &irqstat_c);
706 if (ret < 0) {
707 dev_warn(smb->dev, "reading IRQSTAT_C failed\n");
708 return IRQ_NONE;
709 }
710
711 ret = regmap_read(smb->regmap, IRQSTAT_E, &irqstat_e);
712 if (ret < 0) {
713 dev_warn(smb->dev, "reading IRQSTAT_E failed\n");
714 return IRQ_NONE;
715 }
716
717 /*
718 * If we get charger error we report the error back to user and
719 * disable charging.
720 */
721 if (stat_c & STAT_C_CHARGER_ERROR) {
722 dev_err(smb->dev, "error in charger, disabling charging\n");
723
724 smb347_charging_disable(smb);
725 power_supply_changed(&smb->battery);
726 handled = true;
727 }
728
729 /*
730 * If we reached the termination current the battery is charged and
731 * we can update the status now. Charging is automatically
732 * disabled by the hardware.
733 */
734 if (irqstat_c & (IRQSTAT_C_TERMINATION_IRQ | IRQSTAT_C_TAPER_IRQ)) {
735 if (irqstat_c & IRQSTAT_C_TERMINATION_STAT)
736 power_supply_changed(&smb->battery);
737 handled = true;
738 }
739
740 /*
741 * If we got an under voltage interrupt it means that AC/USB input
742 * was connected or disconnected.
743 */
744 if (irqstat_e & (IRQSTAT_E_USBIN_UV_IRQ | IRQSTAT_E_DCIN_UV_IRQ)) {
745 if (smb347_update_ps_status(smb) > 0) {
746 smb347_start_stop_charging(smb);
747 if (smb->pdata->use_mains)
748 power_supply_changed(&smb->mains);
749 if (smb->pdata->use_usb)
750 power_supply_changed(&smb->usb);
751 }
752 handled = true;
753 }
754
755 return handled ? IRQ_HANDLED : IRQ_NONE;
756 }
757
758 static int smb347_irq_set(struct smb347_charger *smb, bool enable)
759 {
760 int ret;
761
762 ret = smb347_set_writable(smb, true);
763 if (ret < 0)
764 return ret;
765
766 /*
767 * Enable/disable interrupts for:
768 * - under voltage
769 * - termination current reached
770 * - charger error
771 */
772 ret = regmap_update_bits(smb->regmap, CFG_FAULT_IRQ, 0xff,
773 enable ? CFG_FAULT_IRQ_DCIN_UV : 0);
774 if (ret < 0)
775 goto fail;
776
777 ret = regmap_update_bits(smb->regmap, CFG_STATUS_IRQ, 0xff,
778 enable ? CFG_STATUS_IRQ_TERMINATION_OR_TAPER : 0);
779 if (ret < 0)
780 goto fail;
781
782 ret = regmap_update_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_CHARGER_ERROR,
783 enable ? CFG_PIN_EN_CHARGER_ERROR : 0);
784 fail:
785 smb347_set_writable(smb, false);
786 return ret;
787 }
788
789 static inline int smb347_irq_enable(struct smb347_charger *smb)
790 {
791 return smb347_irq_set(smb, true);
792 }
793
794 static inline int smb347_irq_disable(struct smb347_charger *smb)
795 {
796 return smb347_irq_set(smb, false);
797 }
798
799 static int smb347_irq_init(struct smb347_charger *smb,
800 struct i2c_client *client)
801 {
802 const struct smb347_charger_platform_data *pdata = smb->pdata;
803 int ret, irq = gpio_to_irq(pdata->irq_gpio);
804
805 ret = gpio_request_one(pdata->irq_gpio, GPIOF_IN, client->name);
806 if (ret < 0)
807 goto fail;
808
809 ret = request_threaded_irq(irq, NULL, smb347_interrupt,
810 IRQF_TRIGGER_FALLING, client->name, smb);
811 if (ret < 0)
812 goto fail_gpio;
813
814 ret = smb347_set_writable(smb, true);
815 if (ret < 0)
816 goto fail_irq;
817
818 /*
819 * Configure the STAT output to be suitable for interrupts: disable
820 * all other output (except interrupts) and make it active low.
821 */
822 ret = regmap_update_bits(smb->regmap, CFG_STAT,
823 CFG_STAT_ACTIVE_HIGH | CFG_STAT_DISABLED,
824 CFG_STAT_DISABLED);
825 if (ret < 0)
826 goto fail_readonly;
827
828 smb347_set_writable(smb, false);
829 client->irq = irq;
830 return 0;
831
832 fail_readonly:
833 smb347_set_writable(smb, false);
834 fail_irq:
835 free_irq(irq, smb);
836 fail_gpio:
837 gpio_free(pdata->irq_gpio);
838 fail:
839 client->irq = 0;
840 return ret;
841 }
842
843 static int smb347_mains_get_property(struct power_supply *psy,
844 enum power_supply_property prop,
845 union power_supply_propval *val)
846 {
847 struct smb347_charger *smb =
848 container_of(psy, struct smb347_charger, mains);
849
850 if (prop == POWER_SUPPLY_PROP_ONLINE) {
851 val->intval = smb->mains_online;
852 return 0;
853 }
854 return -EINVAL;
855 }
856
857 static enum power_supply_property smb347_mains_properties[] = {
858 POWER_SUPPLY_PROP_ONLINE,
859 };
860
861 static int smb347_usb_get_property(struct power_supply *psy,
862 enum power_supply_property prop,
863 union power_supply_propval *val)
864 {
865 struct smb347_charger *smb =
866 container_of(psy, struct smb347_charger, usb);
867
868 if (prop == POWER_SUPPLY_PROP_ONLINE) {
869 val->intval = smb->usb_online;
870 return 0;
871 }
872 return -EINVAL;
873 }
874
875 static enum power_supply_property smb347_usb_properties[] = {
876 POWER_SUPPLY_PROP_ONLINE,
877 };
878
879 static int smb347_battery_get_property(struct power_supply *psy,
880 enum power_supply_property prop,
881 union power_supply_propval *val)
882 {
883 struct smb347_charger *smb =
884 container_of(psy, struct smb347_charger, battery);
885 const struct smb347_charger_platform_data *pdata = smb->pdata;
886 int ret;
887
888 ret = smb347_update_ps_status(smb);
889 if (ret < 0)
890 return ret;
891
892 switch (prop) {
893 case POWER_SUPPLY_PROP_STATUS:
894 if (!smb347_is_ps_online(smb)) {
895 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
896 break;
897 }
898 if (smb347_charging_status(smb))
899 val->intval = POWER_SUPPLY_STATUS_CHARGING;
900 else
901 val->intval = POWER_SUPPLY_STATUS_FULL;
902 break;
903
904 case POWER_SUPPLY_PROP_CHARGE_TYPE:
905 if (!smb347_is_ps_online(smb))
906 return -ENODATA;
907
908 /*
909 * We handle trickle and pre-charging the same, and taper
910 * and none the same.
911 */
912 switch (smb347_charging_status(smb)) {
913 case 1:
914 val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
915 break;
916 case 2:
917 val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
918 break;
919 default:
920 val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
921 break;
922 }
923 break;
924
925 case POWER_SUPPLY_PROP_TECHNOLOGY:
926 val->intval = pdata->battery_info.technology;
927 break;
928
929 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
930 val->intval = pdata->battery_info.voltage_min_design;
931 break;
932
933 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
934 val->intval = pdata->battery_info.voltage_max_design;
935 break;
936
937 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
938 val->intval = pdata->battery_info.charge_full_design;
939 break;
940
941 case POWER_SUPPLY_PROP_MODEL_NAME:
942 val->strval = pdata->battery_info.name;
943 break;
944
945 default:
946 return -EINVAL;
947 }
948
949 return 0;
950 }
951
952 static enum power_supply_property smb347_battery_properties[] = {
953 POWER_SUPPLY_PROP_STATUS,
954 POWER_SUPPLY_PROP_CHARGE_TYPE,
955 POWER_SUPPLY_PROP_TECHNOLOGY,
956 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
957 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
958 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
959 POWER_SUPPLY_PROP_MODEL_NAME,
960 };
961
962 static bool smb347_volatile_reg(struct device *dev, unsigned int reg)
963 {
964 switch (reg) {
965 case IRQSTAT_A:
966 case IRQSTAT_C:
967 case IRQSTAT_E:
968 case IRQSTAT_F:
969 case STAT_A:
970 case STAT_B:
971 case STAT_C:
972 case STAT_E:
973 return true;
974 }
975
976 return false;
977 }
978
979 static bool smb347_readable_reg(struct device *dev, unsigned int reg)
980 {
981 switch (reg) {
982 case CFG_CHARGE_CURRENT:
983 case CFG_CURRENT_LIMIT:
984 case CFG_FLOAT_VOLTAGE:
985 case CFG_STAT:
986 case CFG_PIN:
987 case CFG_THERM:
988 case CFG_SYSOK:
989 case CFG_OTHER:
990 case CFG_OTG:
991 case CFG_TEMP_LIMIT:
992 case CFG_FAULT_IRQ:
993 case CFG_STATUS_IRQ:
994 case CFG_ADDRESS:
995 case CMD_A:
996 case CMD_B:
997 case CMD_C:
998 return true;
999 }
1000
1001 return smb347_volatile_reg(dev, reg);
1002 }
1003
1004 static const struct regmap_config smb347_regmap = {
1005 .reg_bits = 8,
1006 .val_bits = 8,
1007 .max_register = SMB347_MAX_REGISTER,
1008 .volatile_reg = smb347_volatile_reg,
1009 .readable_reg = smb347_readable_reg,
1010 };
1011
1012 static int smb347_probe(struct i2c_client *client,
1013 const struct i2c_device_id *id)
1014 {
1015 static char *battery[] = { "smb347-battery" };
1016 const struct smb347_charger_platform_data *pdata;
1017 struct device *dev = &client->dev;
1018 struct smb347_charger *smb;
1019 int ret;
1020
1021 pdata = dev->platform_data;
1022 if (!pdata)
1023 return -EINVAL;
1024
1025 if (!pdata->use_mains && !pdata->use_usb)
1026 return -EINVAL;
1027
1028 smb = devm_kzalloc(dev, sizeof(*smb), GFP_KERNEL);
1029 if (!smb)
1030 return -ENOMEM;
1031
1032 i2c_set_clientdata(client, smb);
1033
1034 mutex_init(&smb->lock);
1035 smb->dev = &client->dev;
1036 smb->pdata = pdata;
1037
1038 smb->regmap = devm_regmap_init_i2c(client, &smb347_regmap);
1039 if (IS_ERR(smb->regmap))
1040 return PTR_ERR(smb->regmap);
1041
1042 ret = smb347_hw_init(smb);
1043 if (ret < 0)
1044 return ret;
1045
1046 if (smb->pdata->use_mains) {
1047 smb->mains.name = "smb347-mains";
1048 smb->mains.type = POWER_SUPPLY_TYPE_MAINS;
1049 smb->mains.get_property = smb347_mains_get_property;
1050 smb->mains.properties = smb347_mains_properties;
1051 smb->mains.num_properties = ARRAY_SIZE(smb347_mains_properties);
1052 smb->mains.supplied_to = battery;
1053 smb->mains.num_supplicants = ARRAY_SIZE(battery);
1054 ret = power_supply_register(dev, &smb->mains);
1055 if (ret < 0)
1056 return ret;
1057 }
1058
1059 if (smb->pdata->use_usb) {
1060 smb->usb.name = "smb347-usb";
1061 smb->usb.type = POWER_SUPPLY_TYPE_USB;
1062 smb->usb.get_property = smb347_usb_get_property;
1063 smb->usb.properties = smb347_usb_properties;
1064 smb->usb.num_properties = ARRAY_SIZE(smb347_usb_properties);
1065 smb->usb.supplied_to = battery;
1066 smb->usb.num_supplicants = ARRAY_SIZE(battery);
1067 ret = power_supply_register(dev, &smb->usb);
1068 if (ret < 0) {
1069 if (smb->pdata->use_mains)
1070 power_supply_unregister(&smb->mains);
1071 return ret;
1072 }
1073 }
1074
1075 smb->battery.name = "smb347-battery";
1076 smb->battery.type = POWER_SUPPLY_TYPE_BATTERY;
1077 smb->battery.get_property = smb347_battery_get_property;
1078 smb->battery.properties = smb347_battery_properties;
1079 smb->battery.num_properties = ARRAY_SIZE(smb347_battery_properties);
1080
1081
1082 ret = power_supply_register(dev, &smb->battery);
1083 if (ret < 0) {
1084 if (smb->pdata->use_usb)
1085 power_supply_unregister(&smb->usb);
1086 if (smb->pdata->use_mains)
1087 power_supply_unregister(&smb->mains);
1088 return ret;
1089 }
1090
1091 /*
1092 * Interrupt pin is optional. If it is connected, we setup the
1093 * interrupt support here.
1094 */
1095 if (pdata->irq_gpio >= 0) {
1096 ret = smb347_irq_init(smb, client);
1097 if (ret < 0) {
1098 dev_warn(dev, "failed to initialize IRQ: %d\n", ret);
1099 dev_warn(dev, "disabling IRQ support\n");
1100 } else {
1101 smb347_irq_enable(smb);
1102 }
1103 }
1104
1105 return 0;
1106 }
1107
1108 static int smb347_remove(struct i2c_client *client)
1109 {
1110 struct smb347_charger *smb = i2c_get_clientdata(client);
1111
1112 if (client->irq) {
1113 smb347_irq_disable(smb);
1114 free_irq(client->irq, smb);
1115 gpio_free(smb->pdata->irq_gpio);
1116 }
1117
1118 power_supply_unregister(&smb->battery);
1119 if (smb->pdata->use_usb)
1120 power_supply_unregister(&smb->usb);
1121 if (smb->pdata->use_mains)
1122 power_supply_unregister(&smb->mains);
1123 return 0;
1124 }
1125
1126 static const struct i2c_device_id smb347_id[] = {
1127 { "smb347", 0 },
1128 { }
1129 };
1130 MODULE_DEVICE_TABLE(i2c, smb347_id);
1131
1132 static struct i2c_driver smb347_driver = {
1133 .driver = {
1134 .name = "smb347",
1135 },
1136 .probe = smb347_probe,
1137 .remove = __devexit_p(smb347_remove),
1138 .id_table = smb347_id,
1139 };
1140
1141 module_i2c_driver(smb347_driver);
1142
1143 MODULE_AUTHOR("Bruce E. Robertson <bruce.e.robertson@intel.com>");
1144 MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
1145 MODULE_DESCRIPTION("SMB347 battery charger driver");
1146 MODULE_LICENSE("GPL");
1147 MODULE_ALIAS("i2c:smb347");
Linux kernel - Deliverables
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