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