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block: move down direct IO plugging
[linux/fpc-iii.git] / drivers / power / smb347-charger.c
blob332dd0110bda36e6c7c09a60c98d5bed23d5d3cd
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/err.h>
15 #include <linux/gpio.h>
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/init.h>
19 #include <linux/interrupt.h>
20 #include <linux/i2c.h>
21 #include <linux/mutex.h>
22 #include <linux/power_supply.h>
23 #include <linux/power/smb347-charger.h>
24 #include <linux/regmap.h>
25
26 /*
27 * Configuration registers. These are mirrored to volatile RAM and can be
28 * written once %CMD_A_ALLOW_WRITE is set in %CMD_A register. They will be
29 * reloaded from non-volatile registers after POR.
30 */
31 #define CFG_CHARGE_CURRENT 0x00
32 #define CFG_CHARGE_CURRENT_FCC_MASK 0xe0
33 #define CFG_CHARGE_CURRENT_FCC_SHIFT 5
34 #define CFG_CHARGE_CURRENT_PCC_MASK 0x18
35 #define CFG_CHARGE_CURRENT_PCC_SHIFT 3
36 #define CFG_CHARGE_CURRENT_TC_MASK 0x07
37 #define CFG_CURRENT_LIMIT 0x01
38 #define CFG_CURRENT_LIMIT_DC_MASK 0xf0
39 #define CFG_CURRENT_LIMIT_DC_SHIFT 4
40 #define CFG_CURRENT_LIMIT_USB_MASK 0x0f
41 #define CFG_FLOAT_VOLTAGE 0x03
42 #define CFG_FLOAT_VOLTAGE_FLOAT_MASK 0x3f
43 #define CFG_FLOAT_VOLTAGE_THRESHOLD_MASK 0xc0
44 #define CFG_FLOAT_VOLTAGE_THRESHOLD_SHIFT 6
45 #define CFG_STAT 0x05
46 #define CFG_STAT_DISABLED BIT(5)
47 #define CFG_STAT_ACTIVE_HIGH BIT(7)
48 #define CFG_PIN 0x06
49 #define CFG_PIN_EN_CTRL_MASK 0x60
50 #define CFG_PIN_EN_CTRL_ACTIVE_HIGH 0x40
51 #define CFG_PIN_EN_CTRL_ACTIVE_LOW 0x60
52 #define CFG_PIN_EN_APSD_IRQ BIT(1)
53 #define CFG_PIN_EN_CHARGER_ERROR BIT(2)
54 #define CFG_THERM 0x07
55 #define CFG_THERM_SOFT_HOT_COMPENSATION_MASK 0x03
56 #define CFG_THERM_SOFT_HOT_COMPENSATION_SHIFT 0
57 #define CFG_THERM_SOFT_COLD_COMPENSATION_MASK 0x0c
58 #define CFG_THERM_SOFT_COLD_COMPENSATION_SHIFT 2
59 #define CFG_THERM_MONITOR_DISABLED BIT(4)
60 #define CFG_SYSOK 0x08
61 #define CFG_SYSOK_SUSPEND_HARD_LIMIT_DISABLED BIT(2)
62 #define CFG_OTHER 0x09
63 #define CFG_OTHER_RID_MASK 0xc0
64 #define CFG_OTHER_RID_ENABLED_AUTO_OTG 0xc0
65 #define CFG_OTG 0x0a
66 #define CFG_OTG_TEMP_THRESHOLD_MASK 0x30
67 #define CFG_OTG_TEMP_THRESHOLD_SHIFT 4
68 #define CFG_OTG_CC_COMPENSATION_MASK 0xc0
69 #define CFG_OTG_CC_COMPENSATION_SHIFT 6
70 #define CFG_TEMP_LIMIT 0x0b
71 #define CFG_TEMP_LIMIT_SOFT_HOT_MASK 0x03
72 #define CFG_TEMP_LIMIT_SOFT_HOT_SHIFT 0
73 #define CFG_TEMP_LIMIT_SOFT_COLD_MASK 0x0c
74 #define CFG_TEMP_LIMIT_SOFT_COLD_SHIFT 2
75 #define CFG_TEMP_LIMIT_HARD_HOT_MASK 0x30
76 #define CFG_TEMP_LIMIT_HARD_HOT_SHIFT 4
77 #define CFG_TEMP_LIMIT_HARD_COLD_MASK 0xc0
78 #define CFG_TEMP_LIMIT_HARD_COLD_SHIFT 6
79 #define CFG_FAULT_IRQ 0x0c
80 #define CFG_FAULT_IRQ_DCIN_UV BIT(2)
81 #define CFG_STATUS_IRQ 0x0d
82 #define CFG_STATUS_IRQ_TERMINATION_OR_TAPER BIT(4)
83 #define CFG_ADDRESS 0x0e
84
85 /* Command registers */
86 #define CMD_A 0x30
87 #define CMD_A_CHG_ENABLED BIT(1)
88 #define CMD_A_SUSPEND_ENABLED BIT(2)
89 #define CMD_A_ALLOW_WRITE BIT(7)
90 #define CMD_B 0x31
91 #define CMD_C 0x33
92
93 /* Interrupt Status registers */
94 #define IRQSTAT_A 0x35
95 #define IRQSTAT_C 0x37
96 #define IRQSTAT_C_TERMINATION_STAT BIT(0)
97 #define IRQSTAT_C_TERMINATION_IRQ BIT(1)
98 #define IRQSTAT_C_TAPER_IRQ BIT(3)
99 #define IRQSTAT_E 0x39
100 #define IRQSTAT_E_USBIN_UV_STAT BIT(0)
101 #define IRQSTAT_E_USBIN_UV_IRQ BIT(1)
102 #define IRQSTAT_E_DCIN_UV_STAT BIT(4)
103 #define IRQSTAT_E_DCIN_UV_IRQ BIT(5)
104 #define IRQSTAT_F 0x3a
105
106 /* Status registers */
107 #define STAT_A 0x3b
108 #define STAT_A_FLOAT_VOLTAGE_MASK 0x3f
109 #define STAT_B 0x3c
110 #define STAT_C 0x3d
111 #define STAT_C_CHG_ENABLED BIT(0)
112 #define STAT_C_CHG_MASK 0x06
113 #define STAT_C_CHG_SHIFT 1
114 #define STAT_C_CHARGER_ERROR BIT(6)
115 #define STAT_E 0x3f
116
117 #define SMB347_MAX_REGISTER 0x3f
118
119 /**
120 * struct smb347_charger - smb347 charger instance
121 * @lock: protects concurrent access to online variables
122 * @dev: pointer to device
123 * @regmap: pointer to driver regmap
124 * @mains: power_supply instance for AC/DC power
125 * @usb: power_supply instance for USB power
126 * @battery: power_supply instance for battery
127 * @mains_online: is AC/DC input connected
128 * @usb_online: is USB input connected
129 * @charging_enabled: is charging enabled
130 * @pdata: pointer to platform data
131 */
132 struct smb347_charger {
133 struct mutex lock;
134 struct device *dev;
135 struct regmap *regmap;
136 struct power_supply mains;
137 struct power_supply usb;
138 struct power_supply battery;
139 bool mains_online;
140 bool usb_online;
141 bool charging_enabled;
142 const struct smb347_charger_platform_data *pdata;
143 };
144
145 /* Fast charge current in uA */
146 static const unsigned int fcc_tbl[] = {
147 700000,
148 900000,
149 1200000,
150 1500000,
151 1800000,
152 2000000,
153 2200000,
154 2500000,
155 };
156
157 /* Pre-charge current in uA */
158 static const unsigned int pcc_tbl[] = {
159 100000,
160 150000,
161 200000,
162 250000,
163 };
164
165 /* Termination current in uA */
166 static const unsigned int tc_tbl[] = {
167 37500,
168 50000,
169 100000,
170 150000,
171 200000,
172 250000,
173 500000,
174 600000,
175 };
176
177 /* Input current limit in uA */
178 static const unsigned int icl_tbl[] = {
179 300000,
180 500000,
181 700000,
182 900000,
183 1200000,
184 1500000,
185 1800000,
186 2000000,
187 2200000,
188 2500000,
189 };
190
191 /* Charge current compensation in uA */
192 static const unsigned int ccc_tbl[] = {
193 250000,
194 700000,
195 900000,
196 1200000,
197 };
198
199 /* Convert register value to current using lookup table */
200 static int hw_to_current(const unsigned int *tbl, size_t size, unsigned int val)
201 {
202 if (val >= size)
203 return -EINVAL;
204 return tbl[val];
205 }
206
207 /* Convert current to register value using lookup table */
208 static int current_to_hw(const unsigned int *tbl, size_t size, unsigned int val)
209 {
210 size_t i;
211
212 for (i = 0; i < size; i++)
213 if (val < tbl[i])
214 break;
215 return i > 0 ? i - 1 : -EINVAL;
216 }
217
218 /**
219 * smb347_update_ps_status - refreshes the power source status
220 * @smb: pointer to smb347 charger instance
221 *
222 * Function checks whether any power source is connected to the charger and
223 * updates internal state accordingly. If there is a change to previous state
224 * function returns %1, otherwise %0 and negative errno in case of errror.
225 */
226 static int smb347_update_ps_status(struct smb347_charger *smb)
227 {
228 bool usb = false;
229 bool dc = false;
230 unsigned int val;
231 int ret;
232
233 ret = regmap_read(smb->regmap, IRQSTAT_E, &val);
234 if (ret < 0)
235 return ret;
236
237 /*
238 * Dc and usb are set depending on whether they are enabled in
239 * platform data _and_ whether corresponding undervoltage is set.
240 */
241 if (smb->pdata->use_mains)
242 dc = !(val & IRQSTAT_E_DCIN_UV_STAT);
243 if (smb->pdata->use_usb)
244 usb = !(val & IRQSTAT_E_USBIN_UV_STAT);
245
246 mutex_lock(&smb->lock);
247 ret = smb->mains_online != dc || smb->usb_online != usb;
248 smb->mains_online = dc;
249 smb->usb_online = usb;
250 mutex_unlock(&smb->lock);
251
252 return ret;
253 }
254
255 /*
256 * smb347_is_ps_online - returns whether input power source is connected
257 * @smb: pointer to smb347 charger instance
258 *
259 * Returns %true if input power source is connected. Note that this is
260 * dependent on what platform has configured for usable power sources. For
261 * example if USB is disabled, this will return %false even if the USB cable
262 * is connected.
263 */
264 static bool smb347_is_ps_online(struct smb347_charger *smb)
265 {
266 bool ret;
267
268 mutex_lock(&smb->lock);
269 ret = smb->usb_online || smb->mains_online;
270 mutex_unlock(&smb->lock);
271
272 return ret;
273 }
274
275 /**
276 * smb347_charging_status - returns status of charging
277 * @smb: pointer to smb347 charger instance
278 *
279 * Function returns charging status. %0 means no charging is in progress,
280 * %1 means pre-charging, %2 fast-charging and %3 taper-charging.
281 */
282 static int smb347_charging_status(struct smb347_charger *smb)
283 {
284 unsigned int val;
285 int ret;
286
287 if (!smb347_is_ps_online(smb))
288 return 0;
289
290 ret = regmap_read(smb->regmap, STAT_C, &val);
291 if (ret < 0)
292 return 0;
293
294 return (val & STAT_C_CHG_MASK) >> STAT_C_CHG_SHIFT;
295 }
296
297 static int smb347_charging_set(struct smb347_charger *smb, bool enable)
298 {
299 int ret = 0;
300
301 if (smb->pdata->enable_control != SMB347_CHG_ENABLE_SW) {
302 dev_dbg(smb->dev, "charging enable/disable in SW disabled\n");
303 return 0;
304 }
305
306 mutex_lock(&smb->lock);
307 if (smb->charging_enabled != enable) {
308 ret = regmap_update_bits(smb->regmap, CMD_A, CMD_A_CHG_ENABLED,
309 enable ? CMD_A_CHG_ENABLED : 0);
310 if (!ret)
311 smb->charging_enabled = enable;
312 }
313 mutex_unlock(&smb->lock);
314 return ret;
315 }
316
317 static inline int smb347_charging_enable(struct smb347_charger *smb)
318 {
319 return smb347_charging_set(smb, true);
320 }
321
322 static inline int smb347_charging_disable(struct smb347_charger *smb)
323 {
324 return smb347_charging_set(smb, false);
325 }
326
327 static int smb347_start_stop_charging(struct smb347_charger *smb)
328 {
329 int ret;
330
331 /*
332 * Depending on whether valid power source is connected or not, we
333 * disable or enable the charging. We do it manually because it
334 * depends on how the platform has configured the valid inputs.
335 */
336 if (smb347_is_ps_online(smb)) {
337 ret = smb347_charging_enable(smb);
338 if (ret < 0)
339 dev_err(smb->dev, "failed to enable charging\n");
340 } else {
341 ret = smb347_charging_disable(smb);
342 if (ret < 0)
343 dev_err(smb->dev, "failed to disable charging\n");
344 }
345
346 return ret;
347 }
348
349 static int smb347_set_charge_current(struct smb347_charger *smb)
350 {
351 int ret;
352
353 if (smb->pdata->max_charge_current) {
354 ret = current_to_hw(fcc_tbl, ARRAY_SIZE(fcc_tbl),
355 smb->pdata->max_charge_current);
356 if (ret < 0)
357 return ret;
358
359 ret = regmap_update_bits(smb->regmap, CFG_CHARGE_CURRENT,
360 CFG_CHARGE_CURRENT_FCC_MASK,
361 ret << CFG_CHARGE_CURRENT_FCC_SHIFT);
362 if (ret < 0)
363 return ret;
364 }
365
366 if (smb->pdata->pre_charge_current) {
367 ret = current_to_hw(pcc_tbl, ARRAY_SIZE(pcc_tbl),
368 smb->pdata->pre_charge_current);
369 if (ret < 0)
370 return ret;
371
372 ret = regmap_update_bits(smb->regmap, CFG_CHARGE_CURRENT,
373 CFG_CHARGE_CURRENT_PCC_MASK,
374 ret << CFG_CHARGE_CURRENT_PCC_SHIFT);
375 if (ret < 0)
376 return ret;
377 }
378
379 if (smb->pdata->termination_current) {
380 ret = current_to_hw(tc_tbl, ARRAY_SIZE(tc_tbl),
381 smb->pdata->termination_current);
382 if (ret < 0)
383 return ret;
384
385 ret = regmap_update_bits(smb->regmap, CFG_CHARGE_CURRENT,
386 CFG_CHARGE_CURRENT_TC_MASK, ret);
387 if (ret < 0)
388 return ret;
389 }
390
391 return 0;
392 }
393
394 static int smb347_set_current_limits(struct smb347_charger *smb)
395 {
396 int ret;
397
398 if (smb->pdata->mains_current_limit) {
399 ret = current_to_hw(icl_tbl, ARRAY_SIZE(icl_tbl),
400 smb->pdata->mains_current_limit);
401 if (ret < 0)
402 return ret;
403
404 ret = regmap_update_bits(smb->regmap, CFG_CURRENT_LIMIT,
405 CFG_CURRENT_LIMIT_DC_MASK,
406 ret << CFG_CURRENT_LIMIT_DC_SHIFT);
407 if (ret < 0)
408 return ret;
409 }
410
411 if (smb->pdata->usb_hc_current_limit) {
412 ret = current_to_hw(icl_tbl, ARRAY_SIZE(icl_tbl),
413 smb->pdata->usb_hc_current_limit);
414 if (ret < 0)
415 return ret;
416
417 ret = regmap_update_bits(smb->regmap, CFG_CURRENT_LIMIT,
418 CFG_CURRENT_LIMIT_USB_MASK, ret);
419 if (ret < 0)
420 return ret;
421 }
422
423 return 0;
424 }
425
426 static int smb347_set_voltage_limits(struct smb347_charger *smb)
427 {
428 int ret;
429
430 if (smb->pdata->pre_to_fast_voltage) {
431 ret = smb->pdata->pre_to_fast_voltage;
432
433 /* uV */
434 ret = clamp_val(ret, 2400000, 3000000) - 2400000;
435 ret /= 200000;
436
437 ret = regmap_update_bits(smb->regmap, CFG_FLOAT_VOLTAGE,
438 CFG_FLOAT_VOLTAGE_THRESHOLD_MASK,
439 ret << CFG_FLOAT_VOLTAGE_THRESHOLD_SHIFT);
440 if (ret < 0)
441 return ret;
442 }
443
444 if (smb->pdata->max_charge_voltage) {
445 ret = smb->pdata->max_charge_voltage;
446
447 /* uV */
448 ret = clamp_val(ret, 3500000, 4500000) - 3500000;
449 ret /= 20000;
450
451 ret = regmap_update_bits(smb->regmap, CFG_FLOAT_VOLTAGE,
452 CFG_FLOAT_VOLTAGE_FLOAT_MASK, ret);
453 if (ret < 0)
454 return ret;
455 }
456
457 return 0;
458 }
459
460 static int smb347_set_temp_limits(struct smb347_charger *smb)
461 {
462 bool enable_therm_monitor = false;
463 int ret = 0;
464 int val;
465
466 if (smb->pdata->chip_temp_threshold) {
467 val = smb->pdata->chip_temp_threshold;
468
469 /* degree C */
470 val = clamp_val(val, 100, 130) - 100;
471 val /= 10;
472
473 ret = regmap_update_bits(smb->regmap, CFG_OTG,
474 CFG_OTG_TEMP_THRESHOLD_MASK,
475 val << CFG_OTG_TEMP_THRESHOLD_SHIFT);
476 if (ret < 0)
477 return ret;
478 }
479
480 if (smb->pdata->soft_cold_temp_limit != SMB347_TEMP_USE_DEFAULT) {
481 val = smb->pdata->soft_cold_temp_limit;
482
483 val = clamp_val(val, 0, 15);
484 val /= 5;
485 /* this goes from higher to lower so invert the value */
486 val = ~val & 0x3;
487
488 ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
489 CFG_TEMP_LIMIT_SOFT_COLD_MASK,
490 val << CFG_TEMP_LIMIT_SOFT_COLD_SHIFT);
491 if (ret < 0)
492 return ret;
493
494 enable_therm_monitor = true;
495 }
496
497 if (smb->pdata->soft_hot_temp_limit != SMB347_TEMP_USE_DEFAULT) {
498 val = smb->pdata->soft_hot_temp_limit;
499
500 val = clamp_val(val, 40, 55) - 40;
501 val /= 5;
502
503 ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
504 CFG_TEMP_LIMIT_SOFT_HOT_MASK,
505 val << CFG_TEMP_LIMIT_SOFT_HOT_SHIFT);
506 if (ret < 0)
507 return ret;
508
509 enable_therm_monitor = true;
510 }
511
512 if (smb->pdata->hard_cold_temp_limit != SMB347_TEMP_USE_DEFAULT) {
513 val = smb->pdata->hard_cold_temp_limit;
514
515 val = clamp_val(val, -5, 10) + 5;
516 val /= 5;
517 /* this goes from higher to lower so invert the value */
518 val = ~val & 0x3;
519
520 ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
521 CFG_TEMP_LIMIT_HARD_COLD_MASK,
522 val << CFG_TEMP_LIMIT_HARD_COLD_SHIFT);
523 if (ret < 0)
524 return ret;
525
526 enable_therm_monitor = true;
527 }
528
529 if (smb->pdata->hard_hot_temp_limit != SMB347_TEMP_USE_DEFAULT) {
530 val = smb->pdata->hard_hot_temp_limit;
531
532 val = clamp_val(val, 50, 65) - 50;
533 val /= 5;
534
535 ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
536 CFG_TEMP_LIMIT_HARD_HOT_MASK,
537 val << CFG_TEMP_LIMIT_HARD_HOT_SHIFT);
538 if (ret < 0)
539 return ret;
540
541 enable_therm_monitor = true;
542 }
543
544 /*
545 * If any of the temperature limits are set, we also enable the
546 * thermistor monitoring.
547 *
548 * When soft limits are hit, the device will start to compensate
549 * current and/or voltage depending on the configuration.
550 *
551 * When hard limit is hit, the device will suspend charging
552 * depending on the configuration.
553 */
554 if (enable_therm_monitor) {
555 ret = regmap_update_bits(smb->regmap, CFG_THERM,
556 CFG_THERM_MONITOR_DISABLED, 0);
557 if (ret < 0)
558 return ret;
559 }
560
561 if (smb->pdata->suspend_on_hard_temp_limit) {
562 ret = regmap_update_bits(smb->regmap, CFG_SYSOK,
563 CFG_SYSOK_SUSPEND_HARD_LIMIT_DISABLED, 0);
564 if (ret < 0)
565 return ret;
566 }
567
568 if (smb->pdata->soft_temp_limit_compensation !=
569 SMB347_SOFT_TEMP_COMPENSATE_DEFAULT) {
570 val = smb->pdata->soft_temp_limit_compensation & 0x3;
571
572 ret = regmap_update_bits(smb->regmap, CFG_THERM,
573 CFG_THERM_SOFT_HOT_COMPENSATION_MASK,
574 val << CFG_THERM_SOFT_HOT_COMPENSATION_SHIFT);
575 if (ret < 0)
576 return ret;
577
578 ret = regmap_update_bits(smb->regmap, CFG_THERM,
579 CFG_THERM_SOFT_COLD_COMPENSATION_MASK,
580 val << CFG_THERM_SOFT_COLD_COMPENSATION_SHIFT);
581 if (ret < 0)
582 return ret;
583 }
584
585 if (smb->pdata->charge_current_compensation) {
586 val = current_to_hw(ccc_tbl, ARRAY_SIZE(ccc_tbl),
587 smb->pdata->charge_current_compensation);
588 if (val < 0)
589 return val;
590
591 ret = regmap_update_bits(smb->regmap, CFG_OTG,
592 CFG_OTG_CC_COMPENSATION_MASK,
593 (val & 0x3) << CFG_OTG_CC_COMPENSATION_SHIFT);
594 if (ret < 0)
595 return ret;
596 }
597
598 return ret;
599 }
600
601 /*
602 * smb347_set_writable - enables/disables writing to non-volatile registers
603 * @smb: pointer to smb347 charger instance
604 *
605 * You can enable/disable writing to the non-volatile configuration
606 * registers by calling this function.
607 *
608 * Returns %0 on success and negative errno in case of failure.
609 */
610 static int smb347_set_writable(struct smb347_charger *smb, bool writable)
611 {
612 return regmap_update_bits(smb->regmap, CMD_A, CMD_A_ALLOW_WRITE,
613 writable ? CMD_A_ALLOW_WRITE : 0);
614 }
615
616 static int smb347_hw_init(struct smb347_charger *smb)
617 {
618 unsigned int val;
619 int ret;
620
621 ret = smb347_set_writable(smb, true);
622 if (ret < 0)
623 return ret;
624
625 /*
626 * Program the platform specific configuration values to the device
627 * first.
628 */
629 ret = smb347_set_charge_current(smb);
630 if (ret < 0)
631 goto fail;
632
633 ret = smb347_set_current_limits(smb);
634 if (ret < 0)
635 goto fail;
636
637 ret = smb347_set_voltage_limits(smb);
638 if (ret < 0)
639 goto fail;
640
641 ret = smb347_set_temp_limits(smb);
642 if (ret < 0)
643 goto fail;
644
645 /* If USB charging is disabled we put the USB in suspend mode */
646 if (!smb->pdata->use_usb) {
647 ret = regmap_update_bits(smb->regmap, CMD_A,
648 CMD_A_SUSPEND_ENABLED,
649 CMD_A_SUSPEND_ENABLED);
650 if (ret < 0)
651 goto fail;
652 }
653
654 /*
655 * If configured by platform data, we enable hardware Auto-OTG
656 * support for driving VBUS. Otherwise we disable it.
657 */
658 ret = regmap_update_bits(smb->regmap, CFG_OTHER, CFG_OTHER_RID_MASK,
659 smb->pdata->use_usb_otg ? CFG_OTHER_RID_ENABLED_AUTO_OTG : 0);
660 if (ret < 0)
661 goto fail;
662
663 /*
664 * Make the charging functionality controllable by a write to the
665 * command register unless pin control is specified in the platform
666 * data.
667 */
668 switch (smb->pdata->enable_control) {
669 case SMB347_CHG_ENABLE_PIN_ACTIVE_LOW:
670 val = CFG_PIN_EN_CTRL_ACTIVE_LOW;
671 break;
672 case SMB347_CHG_ENABLE_PIN_ACTIVE_HIGH:
673 val = CFG_PIN_EN_CTRL_ACTIVE_HIGH;
674 break;
675 default:
676 val = 0;
677 break;
678 }
679
680 ret = regmap_update_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_CTRL_MASK,
681 val);
682 if (ret < 0)
683 goto fail;
684
685 /* Disable Automatic Power Source Detection (APSD) interrupt. */
686 ret = regmap_update_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_APSD_IRQ, 0);
687 if (ret < 0)
688 goto fail;
689
690 ret = smb347_update_ps_status(smb);
691 if (ret < 0)
692 goto fail;
693
694 ret = smb347_start_stop_charging(smb);
695
696 fail:
697 smb347_set_writable(smb, false);
698 return ret;
699 }
700
701 static irqreturn_t smb347_interrupt(int irq, void *data)
702 {
703 struct smb347_charger *smb = data;
704 unsigned int stat_c, irqstat_e, irqstat_c;
705 bool handled = false;
706 int ret;
707
708 ret = regmap_read(smb->regmap, STAT_C, &stat_c);
709 if (ret < 0) {
710 dev_warn(smb->dev, "reading STAT_C failed\n");
711 return IRQ_NONE;
712 }
713
714 ret = regmap_read(smb->regmap, IRQSTAT_C, &irqstat_c);
715 if (ret < 0) {
716 dev_warn(smb->dev, "reading IRQSTAT_C failed\n");
717 return IRQ_NONE;
718 }
719
720 ret = regmap_read(smb->regmap, IRQSTAT_E, &irqstat_e);
721 if (ret < 0) {
722 dev_warn(smb->dev, "reading IRQSTAT_E failed\n");
723 return IRQ_NONE;
724 }
725
726 /*
727 * If we get charger error we report the error back to user and
728 * disable charging.
729 */
730 if (stat_c & STAT_C_CHARGER_ERROR) {
731 dev_err(smb->dev, "error in charger, disabling charging\n");
732
733 smb347_charging_disable(smb);
734 power_supply_changed(&smb->battery);
735 handled = true;
736 }
737
738 /*
739 * If we reached the termination current the battery is charged and
740 * we can update the status now. Charging is automatically
741 * disabled by the hardware.
742 */
743 if (irqstat_c & (IRQSTAT_C_TERMINATION_IRQ | IRQSTAT_C_TAPER_IRQ)) {
744 if (irqstat_c & IRQSTAT_C_TERMINATION_STAT)
745 power_supply_changed(&smb->battery);
746 handled = true;
747 }
748
749 /*
750 * If we got an under voltage interrupt it means that AC/USB input
751 * was connected or disconnected.
752 */
753 if (irqstat_e & (IRQSTAT_E_USBIN_UV_IRQ | IRQSTAT_E_DCIN_UV_IRQ)) {
754 if (smb347_update_ps_status(smb) > 0) {
755 smb347_start_stop_charging(smb);
756 if (smb->pdata->use_mains)
757 power_supply_changed(&smb->mains);
758 if (smb->pdata->use_usb)
759 power_supply_changed(&smb->usb);
760 }
761 handled = true;
762 }
763
764 return handled ? IRQ_HANDLED : IRQ_NONE;
765 }
766
767 static int smb347_irq_set(struct smb347_charger *smb, bool enable)
768 {
769 int ret;
770
771 ret = smb347_set_writable(smb, true);
772 if (ret < 0)
773 return ret;
774
775 /*
776 * Enable/disable interrupts for:
777 * - under voltage
778 * - termination current reached
779 * - charger error
780 */
781 ret = regmap_update_bits(smb->regmap, CFG_FAULT_IRQ, 0xff,
782 enable ? CFG_FAULT_IRQ_DCIN_UV : 0);
783 if (ret < 0)
784 goto fail;
785
786 ret = regmap_update_bits(smb->regmap, CFG_STATUS_IRQ, 0xff,
787 enable ? CFG_STATUS_IRQ_TERMINATION_OR_TAPER : 0);
788 if (ret < 0)
789 goto fail;
790
791 ret = regmap_update_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_CHARGER_ERROR,
792 enable ? CFG_PIN_EN_CHARGER_ERROR : 0);
793 fail:
794 smb347_set_writable(smb, false);
795 return ret;
796 }
797
798 static inline int smb347_irq_enable(struct smb347_charger *smb)
799 {
800 return smb347_irq_set(smb, true);
801 }
802
803 static inline int smb347_irq_disable(struct smb347_charger *smb)
804 {
805 return smb347_irq_set(smb, false);
806 }
807
808 static int smb347_irq_init(struct smb347_charger *smb,
809 struct i2c_client *client)
810 {
811 const struct smb347_charger_platform_data *pdata = smb->pdata;
812 int ret, irq = gpio_to_irq(pdata->irq_gpio);
813
814 ret = gpio_request_one(pdata->irq_gpio, GPIOF_IN, client->name);
815 if (ret < 0)
816 goto fail;
817
818 ret = request_threaded_irq(irq, NULL, smb347_interrupt,
819 IRQF_TRIGGER_FALLING, client->name, smb);
820 if (ret < 0)
821 goto fail_gpio;
822
823 ret = smb347_set_writable(smb, true);
824 if (ret < 0)
825 goto fail_irq;
826
827 /*
828 * Configure the STAT output to be suitable for interrupts: disable
829 * all other output (except interrupts) and make it active low.
830 */
831 ret = regmap_update_bits(smb->regmap, CFG_STAT,
832 CFG_STAT_ACTIVE_HIGH | CFG_STAT_DISABLED,
833 CFG_STAT_DISABLED);
834 if (ret < 0)
835 goto fail_readonly;
836
837 smb347_set_writable(smb, false);
838 client->irq = irq;
839 return 0;
840
841 fail_readonly:
842 smb347_set_writable(smb, false);
843 fail_irq:
844 free_irq(irq, smb);
845 fail_gpio:
846 gpio_free(pdata->irq_gpio);
847 fail:
848 client->irq = 0;
849 return ret;
850 }
851
852 /*
853 * Returns the constant charge current programmed
854 * into the charger in uA.
855 */
856 static int get_const_charge_current(struct smb347_charger *smb)
857 {
858 int ret, intval;
859 unsigned int v;
860
861 if (!smb347_is_ps_online(smb))
862 return -ENODATA;
863
864 ret = regmap_read(smb->regmap, STAT_B, &v);
865 if (ret < 0)
866 return ret;
867
868 /*
869 * The current value is composition of FCC and PCC values
870 * and we can detect which table to use from bit 5.
871 */
872 if (v & 0x20) {
873 intval = hw_to_current(fcc_tbl, ARRAY_SIZE(fcc_tbl), v & 7);
874 } else {
875 v >>= 3;
876 intval = hw_to_current(pcc_tbl, ARRAY_SIZE(pcc_tbl), v & 7);
877 }
878
879 return intval;
880 }
881
882 /*
883 * Returns the constant charge voltage programmed
884 * into the charger in uV.
885 */
886 static int get_const_charge_voltage(struct smb347_charger *smb)
887 {
888 int ret, intval;
889 unsigned int v;
890
891 if (!smb347_is_ps_online(smb))
892 return -ENODATA;
893
894 ret = regmap_read(smb->regmap, STAT_A, &v);
895 if (ret < 0)
896 return ret;
897
898 v &= STAT_A_FLOAT_VOLTAGE_MASK;
899 if (v > 0x3d)
900 v = 0x3d;
901
902 intval = 3500000 + v * 20000;
903
904 return intval;
905 }
906
907 static int smb347_mains_get_property(struct power_supply *psy,
908 enum power_supply_property prop,
909 union power_supply_propval *val)
910 {
911 struct smb347_charger *smb =
912 container_of(psy, struct smb347_charger, mains);
913 int ret;
914
915 switch (prop) {
916 case POWER_SUPPLY_PROP_ONLINE:
917 val->intval = smb->mains_online;
918 break;
919
920 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
921 ret = get_const_charge_voltage(smb);
922 if (ret < 0)
923 return ret;
924 else
925 val->intval = ret;
926 break;
927
928 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
929 ret = get_const_charge_current(smb);
930 if (ret < 0)
931 return ret;
932 else
933 val->intval = ret;
934 break;
935
936 default:
937 return -EINVAL;
938 }
939
940 return 0;
941 }
942
943 static enum power_supply_property smb347_mains_properties[] = {
944 POWER_SUPPLY_PROP_ONLINE,
945 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
946 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
947 };
948
949 static int smb347_usb_get_property(struct power_supply *psy,
950 enum power_supply_property prop,
951 union power_supply_propval *val)
952 {
953 struct smb347_charger *smb =
954 container_of(psy, struct smb347_charger, usb);
955 int ret;
956
957 switch (prop) {
958 case POWER_SUPPLY_PROP_ONLINE:
959 val->intval = smb->usb_online;
960 break;
961
962 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
963 ret = get_const_charge_voltage(smb);
964 if (ret < 0)
965 return ret;
966 else
967 val->intval = ret;
968 break;
969
970 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
971 ret = get_const_charge_current(smb);
972 if (ret < 0)
973 return ret;
974 else
975 val->intval = ret;
976 break;
977
978 default:
979 return -EINVAL;
980 }
981
982 return 0;
983 }
984
985 static enum power_supply_property smb347_usb_properties[] = {
986 POWER_SUPPLY_PROP_ONLINE,
987 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
988 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
989 };
990
991 static int smb347_battery_get_property(struct power_supply *psy,
992 enum power_supply_property prop,
993 union power_supply_propval *val)
994 {
995 struct smb347_charger *smb =
996 container_of(psy, struct smb347_charger, battery);
997 const struct smb347_charger_platform_data *pdata = smb->pdata;
998 int ret;
999
1000 ret = smb347_update_ps_status(smb);
1001 if (ret < 0)
1002 return ret;
1003
1004 switch (prop) {
1005 case POWER_SUPPLY_PROP_STATUS:
1006 if (!smb347_is_ps_online(smb)) {
1007 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
1008 break;
1009 }
1010 if (smb347_charging_status(smb))
1011 val->intval = POWER_SUPPLY_STATUS_CHARGING;
1012 else
1013 val->intval = POWER_SUPPLY_STATUS_FULL;
1014 break;
1015
1016 case POWER_SUPPLY_PROP_CHARGE_TYPE:
1017 if (!smb347_is_ps_online(smb))
1018 return -ENODATA;
1019
1020 /*
1021 * We handle trickle and pre-charging the same, and taper
1022 * and none the same.
1023 */
1024 switch (smb347_charging_status(smb)) {
1025 case 1:
1026 val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
1027 break;
1028 case 2:
1029 val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
1030 break;
1031 default:
1032 val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
1033 break;
1034 }
1035 break;
1036
1037 case POWER_SUPPLY_PROP_TECHNOLOGY:
1038 val->intval = pdata->battery_info.technology;
1039 break;
1040
1041 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
1042 val->intval = pdata->battery_info.voltage_min_design;
1043 break;
1044
1045 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
1046 val->intval = pdata->battery_info.voltage_max_design;
1047 break;
1048
1049 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
1050 val->intval = pdata->battery_info.charge_full_design;
1051 break;
1052
1053 case POWER_SUPPLY_PROP_MODEL_NAME:
1054 val->strval = pdata->battery_info.name;
1055 break;
1056
1057 default:
1058 return -EINVAL;
1059 }
1060
1061 return 0;
1062 }
1063
1064 static enum power_supply_property smb347_battery_properties[] = {
1065 POWER_SUPPLY_PROP_STATUS,
1066 POWER_SUPPLY_PROP_CHARGE_TYPE,
1067 POWER_SUPPLY_PROP_TECHNOLOGY,
1068 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
1069 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
1070 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
1071 POWER_SUPPLY_PROP_MODEL_NAME,
1072 };
1073
1074 static bool smb347_volatile_reg(struct device *dev, unsigned int reg)
1075 {
1076 switch (reg) {
1077 case IRQSTAT_A:
1078 case IRQSTAT_C:
1079 case IRQSTAT_E:
1080 case IRQSTAT_F:
1081 case STAT_A:
1082 case STAT_B:
1083 case STAT_C:
1084 case STAT_E:
1085 return true;
1086 }
1087
1088 return false;
1089 }
1090
1091 static bool smb347_readable_reg(struct device *dev, unsigned int reg)
1092 {
1093 switch (reg) {
1094 case CFG_CHARGE_CURRENT:
1095 case CFG_CURRENT_LIMIT:
1096 case CFG_FLOAT_VOLTAGE:
1097 case CFG_STAT:
1098 case CFG_PIN:
1099 case CFG_THERM:
1100 case CFG_SYSOK:
1101 case CFG_OTHER:
1102 case CFG_OTG:
1103 case CFG_TEMP_LIMIT:
1104 case CFG_FAULT_IRQ:
1105 case CFG_STATUS_IRQ:
1106 case CFG_ADDRESS:
1107 case CMD_A:
1108 case CMD_B:
1109 case CMD_C:
1110 return true;
1111 }
1112
1113 return smb347_volatile_reg(dev, reg);
1114 }
1115
1116 static const struct regmap_config smb347_regmap = {
1117 .reg_bits = 8,
1118 .val_bits = 8,
1119 .max_register = SMB347_MAX_REGISTER,
1120 .volatile_reg = smb347_volatile_reg,
1121 .readable_reg = smb347_readable_reg,
1122 };
1123
1124 static int smb347_probe(struct i2c_client *client,
1125 const struct i2c_device_id *id)
1126 {
1127 static char *battery[] = { "smb347-battery" };
1128 const struct smb347_charger_platform_data *pdata;
1129 struct device *dev = &client->dev;
1130 struct smb347_charger *smb;
1131 int ret;
1132
1133 pdata = dev->platform_data;
1134 if (!pdata)
1135 return -EINVAL;
1136
1137 if (!pdata->use_mains && !pdata->use_usb)
1138 return -EINVAL;
1139
1140 smb = devm_kzalloc(dev, sizeof(*smb), GFP_KERNEL);
1141 if (!smb)
1142 return -ENOMEM;
1143
1144 i2c_set_clientdata(client, smb);
1145
1146 mutex_init(&smb->lock);
1147 smb->dev = &client->dev;
1148 smb->pdata = pdata;
1149
1150 smb->regmap = devm_regmap_init_i2c(client, &smb347_regmap);
1151 if (IS_ERR(smb->regmap))
1152 return PTR_ERR(smb->regmap);
1153
1154 ret = smb347_hw_init(smb);
1155 if (ret < 0)
1156 return ret;
1157
1158 if (smb->pdata->use_mains) {
1159 smb->mains.name = "smb347-mains";
1160 smb->mains.type = POWER_SUPPLY_TYPE_MAINS;
1161 smb->mains.get_property = smb347_mains_get_property;
1162 smb->mains.properties = smb347_mains_properties;
1163 smb->mains.num_properties = ARRAY_SIZE(smb347_mains_properties);
1164 smb->mains.supplied_to = battery;
1165 smb->mains.num_supplicants = ARRAY_SIZE(battery);
1166 ret = power_supply_register(dev, &smb->mains);
1167 if (ret < 0)
1168 return ret;
1169 }
1170
1171 if (smb->pdata->use_usb) {
1172 smb->usb.name = "smb347-usb";
1173 smb->usb.type = POWER_SUPPLY_TYPE_USB;
1174 smb->usb.get_property = smb347_usb_get_property;
1175 smb->usb.properties = smb347_usb_properties;
1176 smb->usb.num_properties = ARRAY_SIZE(smb347_usb_properties);
1177 smb->usb.supplied_to = battery;
1178 smb->usb.num_supplicants = ARRAY_SIZE(battery);
1179 ret = power_supply_register(dev, &smb->usb);
1180 if (ret < 0) {
1181 if (smb->pdata->use_mains)
1182 power_supply_unregister(&smb->mains);
1183 return ret;
1184 }
1185 }
1186
1187 smb->battery.name = "smb347-battery";
1188 smb->battery.type = POWER_SUPPLY_TYPE_BATTERY;
1189 smb->battery.get_property = smb347_battery_get_property;
1190 smb->battery.properties = smb347_battery_properties;
1191 smb->battery.num_properties = ARRAY_SIZE(smb347_battery_properties);
1192
1193
1194 ret = power_supply_register(dev, &smb->battery);
1195 if (ret < 0) {
1196 if (smb->pdata->use_usb)
1197 power_supply_unregister(&smb->usb);
1198 if (smb->pdata->use_mains)
1199 power_supply_unregister(&smb->mains);
1200 return ret;
1201 }
1202
1203 /*
1204 * Interrupt pin is optional. If it is connected, we setup the
1205 * interrupt support here.
1206 */
1207 if (pdata->irq_gpio >= 0) {
1208 ret = smb347_irq_init(smb, client);
1209 if (ret < 0) {
1210 dev_warn(dev, "failed to initialize IRQ: %d\n", ret);
1211 dev_warn(dev, "disabling IRQ support\n");
1212 } else {
1213 smb347_irq_enable(smb);
1214 }
1215 }
1216
1217 return 0;
1218 }
1219
1220 static int smb347_remove(struct i2c_client *client)
1221 {
1222 struct smb347_charger *smb = i2c_get_clientdata(client);
1223
1224 if (client->irq) {
1225 smb347_irq_disable(smb);
1226 free_irq(client->irq, smb);
1227 gpio_free(smb->pdata->irq_gpio);
1228 }
1229
1230 power_supply_unregister(&smb->battery);
1231 if (smb->pdata->use_usb)
1232 power_supply_unregister(&smb->usb);
1233 if (smb->pdata->use_mains)
1234 power_supply_unregister(&smb->mains);
1235 return 0;
1236 }
1237
1238 static const struct i2c_device_id smb347_id[] = {
1239 { "smb347", 0 },
1240 { }
1241 };
1242 MODULE_DEVICE_TABLE(i2c, smb347_id);
1243
1244 static struct i2c_driver smb347_driver = {
1245 .driver = {
1246 .name = "smb347",
1247 },
1248 .probe = smb347_probe,
1249 .remove = __devexit_p(smb347_remove),
1250 .id_table = smb347_id,
1251 };
1252
1253 module_i2c_driver(smb347_driver);
1254
1255 MODULE_AUTHOR("Bruce E. Robertson <bruce.e.robertson@intel.com>");
1256 MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
1257 MODULE_DESCRIPTION("SMB347 battery charger driver");
1258 MODULE_LICENSE("GPL");
1259 MODULE_ALIAS("i2c:smb347");
Linux with added FPC-III support