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1/*
2 * Battery driver for Marvell 88PM860x PMIC
3 *
4 * Copyright (c) 2012 Marvell International Ltd.
5 * Author: Jett Zhou <jtzhou@marvell.com>
6 * Haojian Zhuang <haojian.zhuang@marvell.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/platform_device.h>
16#include <linux/slab.h>
17#include <linux/mutex.h>
18#include <linux/string.h>
19#include <linux/power_supply.h>
20#include <linux/mfd/88pm860x.h>
21#include <linux/delay.h>
22
23/* bit definitions of Status Query Interface 2 */
24#define STATUS2_CHG (1 << 2)
25#define STATUS2_BAT (1 << 3)
26#define STATUS2_VBUS (1 << 4)
27
28/* bit definitions of Measurement Enable 1 Register */
29#define MEAS1_TINT (1 << 3)
30#define MEAS1_GP1 (1 << 5)
31
32/* bit definitions of Measurement Enable 3 Register */
33#define MEAS3_IBAT (1 << 0)
34#define MEAS3_BAT_DET (1 << 1)
35#define MEAS3_CC (1 << 2)
36
37/* bit definitions of Measurement Off Time Register */
38#define MEAS_OFF_SLEEP_EN (1 << 1)
39
40/* bit definitions of GPADC Bias Current 2 Register */
41#define GPBIAS2_GPADC1_SET (2 << 4)
42/* GPADC1 Bias Current value in uA unit */
43#define GPBIAS2_GPADC1_UA ((GPBIAS2_GPADC1_SET >> 4) * 5 + 1)
44
45/* bit definitions of GPADC Misc 1 Register */
46#define GPMISC1_GPADC_EN (1 << 0)
47
48/* bit definitions of Charger Control 6 Register */
49#define CC6_BAT_DET_GPADC1 1
50
51/* bit definitions of Coulomb Counter Reading Register */
52#define CCNT_AVG_SEL (4 << 3)
53
54/* bit definitions of RTC miscellaneous Register1 */
55#define RTC_SOC_5LSB (0x1F << 3)
56
57/* bit definitions of RTC Register1 */
58#define RTC_SOC_3MSB (0x7)
59
60/* bit definitions of Power up Log register */
61#define BAT_WU_LOG (1<<6)
62
63/* coulomb counter index */
64#define CCNT_POS1 0
65#define CCNT_POS2 1
66#define CCNT_NEG1 2
67#define CCNT_NEG2 3
68#define CCNT_SPOS 4
69#define CCNT_SNEG 5
70
71/* OCV -- Open Circuit Voltage */
72#define OCV_MODE_ACTIVE 0
73#define OCV_MODE_SLEEP 1
74
75/* Vbat range of CC for measuring Rbat */
76#define LOW_BAT_THRESHOLD 3600
77#define VBATT_RESISTOR_MIN 3800
78#define VBATT_RESISTOR_MAX 4100
79
80/* TBAT for batt, TINT for chip itself */
81#define PM860X_TEMP_TINT (0)
82#define PM860X_TEMP_TBAT (1)
83
84/*
85 * Battery temperature based on NTC resistor, defined
86 * corresponding resistor value -- Ohm / C degeree.
87 */
88#define TBAT_NEG_25D 127773 /* -25 */
89#define TBAT_NEG_10D 54564 /* -10 */
90#define TBAT_0D 32330 /* 0 */
91#define TBAT_10D 19785 /* 10 */
92#define TBAT_20D 12468 /* 20 */
93#define TBAT_30D 8072 /* 30 */
94#define TBAT_40D 5356 /* 40 */
95
96struct pm860x_battery_info {
97 struct pm860x_chip *chip;
98 struct i2c_client *i2c;
99 struct device *dev;
100
101 struct power_supply battery;
102 struct mutex lock;
103 int status;
104 int irq_cc;
105 int irq_batt;
106 int max_capacity;
107 int resistor; /* Battery Internal Resistor */
108 int last_capacity;
109 int start_soc;
110 unsigned present:1;
111 unsigned temp_type:1; /* TINT or TBAT */
112};
113
114struct ccnt {
115 unsigned long long int pos;
116 unsigned long long int neg;
117 unsigned int spos;
118 unsigned int sneg;
119
120 int total_chg; /* mAh(3.6C) */
121 int total_dischg; /* mAh(3.6C) */
122};
123
124/*
125 * State of Charge.
126 * The first number is mAh(=3.6C), and the second number is percent point.
127 */
128static int array_soc[][2] = {
129 {4170, 100}, {4154, 99}, {4136, 98}, {4122, 97}, {4107, 96},
130 {4102, 95}, {4088, 94}, {4081, 93}, {4070, 92}, {4060, 91},
131 {4053, 90}, {4044, 89}, {4035, 88}, {4028, 87}, {4019, 86},
132 {4013, 85}, {4006, 84}, {3995, 83}, {3987, 82}, {3982, 81},
133 {3976, 80}, {3968, 79}, {3962, 78}, {3954, 77}, {3946, 76},
134 {3941, 75}, {3934, 74}, {3929, 73}, {3922, 72}, {3916, 71},
135 {3910, 70}, {3904, 69}, {3898, 68}, {3892, 67}, {3887, 66},
136 {3880, 65}, {3874, 64}, {3868, 63}, {3862, 62}, {3854, 61},
137 {3849, 60}, {3843, 59}, {3840, 58}, {3833, 57}, {3829, 56},
138 {3824, 55}, {3818, 54}, {3815, 53}, {3810, 52}, {3808, 51},
139 {3804, 50}, {3801, 49}, {3798, 48}, {3796, 47}, {3792, 46},
140 {3789, 45}, {3785, 44}, {3784, 43}, {3782, 42}, {3780, 41},
141 {3777, 40}, {3776, 39}, {3774, 38}, {3772, 37}, {3771, 36},
142 {3769, 35}, {3768, 34}, {3764, 33}, {3763, 32}, {3760, 31},
143 {3760, 30}, {3754, 29}, {3750, 28}, {3749, 27}, {3744, 26},
144 {3740, 25}, {3734, 24}, {3732, 23}, {3728, 22}, {3726, 21},
145 {3720, 20}, {3716, 19}, {3709, 18}, {3703, 17}, {3698, 16},
146 {3692, 15}, {3683, 14}, {3675, 13}, {3670, 12}, {3665, 11},
147 {3661, 10}, {3649, 9}, {3637, 8}, {3622, 7}, {3609, 6},
148 {3580, 5}, {3558, 4}, {3540, 3}, {3510, 2}, {3429, 1},
149};
150
151static struct ccnt ccnt_data;
152
153/*
154 * register 1 bit[7:0] -- bit[11:4] of measured value of voltage
155 * register 0 bit[3:0] -- bit[3:0] of measured value of voltage
156 */
157static int measure_12bit_voltage(struct pm860x_battery_info *info,
158 int offset, int *data)
159{
160 unsigned char buf[2];
161 int ret;
162
163 ret = pm860x_bulk_read(info->i2c, offset, 2, buf);
164 if (ret < 0)
165 return ret;
166
167 *data = ((buf[0] & 0xff) << 4) | (buf[1] & 0x0f);
168 /* V_MEAS(mV) = data * 1.8 * 1000 / (2^12) */
169 *data = ((*data & 0xfff) * 9 * 25) >> 9;
170 return 0;
171}
172
173static int measure_vbatt(struct pm860x_battery_info *info, int state,
174 int *data)
175{
176 unsigned char buf[5];
177 int ret;
178
179 switch (state) {
180 case OCV_MODE_ACTIVE:
181 ret = measure_12bit_voltage(info, PM8607_VBAT_MEAS1, data);
182 if (ret)
183 return ret;
184 /* V_BATT_MEAS(mV) = value * 3 * 1.8 * 1000 / (2^12) */
185 *data *= 3;
186 break;
187 case OCV_MODE_SLEEP:
188 /*
189 * voltage value of VBATT in sleep mode is saved in different
190 * registers.
191 * bit[11:10] -- bit[7:6] of LDO9(0x18)
192 * bit[9:8] -- bit[7:6] of LDO8(0x17)
193 * bit[7:6] -- bit[7:6] of LDO7(0x16)
194 * bit[5:4] -- bit[7:6] of LDO6(0x15)
195 * bit[3:0] -- bit[7:4] of LDO5(0x14)
196 */
197 ret = pm860x_bulk_read(info->i2c, PM8607_LDO5, 5, buf);
198 if (ret < 0)
199 return ret;
200 ret = ((buf[4] >> 6) << 10) | ((buf[3] >> 6) << 8)
201 | ((buf[2] >> 6) << 6) | ((buf[1] >> 6) << 4)
202 | (buf[0] >> 4);
203 /* V_BATT_MEAS(mV) = data * 3 * 1.8 * 1000 / (2^12) */
204 *data = ((*data & 0xff) * 27 * 25) >> 9;
205 break;
206 default:
207 return -EINVAL;
208 }
209 return 0;
210}
211
212/*
213 * Return value is signed data.
214 * Negative value means discharging, and positive value means charging.
215 */
216static int measure_current(struct pm860x_battery_info *info, int *data)
217{
218 unsigned char buf[2];
219 short s;
220 int ret;
221
222 ret = pm860x_bulk_read(info->i2c, PM8607_IBAT_MEAS1, 2, buf);
223 if (ret < 0)
224 return ret;
225
226 s = ((buf[0] & 0xff) << 8) | (buf[1] & 0xff);
227 /* current(mA) = value * 0.125 */
228 *data = s >> 3;
229 return 0;
230}
231
232static int set_charger_current(struct pm860x_battery_info *info, int data,
233 int *old)
234{
235 int ret;
236
237 if (data < 50 || data > 1600 || !old)
238 return -EINVAL;
239
240 data = ((data - 50) / 50) & 0x1f;
241 *old = pm860x_reg_read(info->i2c, PM8607_CHG_CTRL2);
242 *old = (*old & 0x1f) * 50 + 50;
243 ret = pm860x_set_bits(info->i2c, PM8607_CHG_CTRL2, 0x1f, data);
244 if (ret < 0)
245 return ret;
246 return 0;
247}
248
249static int read_ccnt(struct pm860x_battery_info *info, int offset,
250 int *ccnt)
251{
252 unsigned char buf[2];
253 int ret;
254
255 ret = pm860x_set_bits(info->i2c, PM8607_CCNT, 7, offset & 7);
256 if (ret < 0)
257 goto out;
258 ret = pm860x_bulk_read(info->i2c, PM8607_CCNT_MEAS1, 2, buf);
259 if (ret < 0)
260 goto out;
261 *ccnt = ((buf[0] & 0xff) << 8) | (buf[1] & 0xff);
262 return 0;
263out:
264 return ret;
265}
266
267static int calc_ccnt(struct pm860x_battery_info *info, struct ccnt *ccnt)
268{
269 unsigned int sum;
270 int ret;
271 int data;
272
273 ret = read_ccnt(info, CCNT_POS1, &data);
274 if (ret)
275 goto out;
276 sum = data & 0xffff;
277 ret = read_ccnt(info, CCNT_POS2, &data);
278 if (ret)
279 goto out;
280 sum |= (data & 0xffff) << 16;
281 ccnt->pos += sum;
282
283 ret = read_ccnt(info, CCNT_NEG1, &data);
284 if (ret)
285 goto out;
286 sum = data & 0xffff;
287 ret = read_ccnt(info, CCNT_NEG2, &data);
288 if (ret)
289 goto out;
290 sum |= (data & 0xffff) << 16;
291 sum = ~sum + 1; /* since it's negative */
292 ccnt->neg += sum;
293
294 ret = read_ccnt(info, CCNT_SPOS, &data);
295 if (ret)
296 goto out;
297 ccnt->spos += data;
298 ret = read_ccnt(info, CCNT_SNEG, &data);
299 if (ret)
300 goto out;
301
302 /*
303 * charge(mAh) = count * 1.6984 * 1e(-8)
304 * = count * 16984 * 1.024 * 1.024 * 1.024 / (2 ^ 40)
305 * = count * 18236 / (2 ^ 40)
306 */
307 ccnt->total_chg = (int) ((ccnt->pos * 18236) >> 40);
308 ccnt->total_dischg = (int) ((ccnt->neg * 18236) >> 40);
309 return 0;
310out:
311 return ret;
312}
313
314static int clear_ccnt(struct pm860x_battery_info *info, struct ccnt *ccnt)
315{
316 int data;
317
318 memset(ccnt, 0, sizeof(*ccnt));
319 /* read to clear ccnt */
320 read_ccnt(info, CCNT_POS1, &data);
321 read_ccnt(info, CCNT_POS2, &data);
322 read_ccnt(info, CCNT_NEG1, &data);
323 read_ccnt(info, CCNT_NEG2, &data);
324 read_ccnt(info, CCNT_SPOS, &data);
325 read_ccnt(info, CCNT_SNEG, &data);
326 return 0;
327}
328
329/* Calculate Open Circuit Voltage */
330static int calc_ocv(struct pm860x_battery_info *info, int *ocv)
331{
332 int ret;
333 int i;
334 int data;
335 int vbatt_avg;
336 int vbatt_sum;
337 int ibatt_avg;
338 int ibatt_sum;
339
340 if (!ocv)
341 return -EINVAL;
342
343 for (i = 0, ibatt_sum = 0, vbatt_sum = 0; i < 10; i++) {
344 ret = measure_vbatt(info, OCV_MODE_ACTIVE, &data);
345 if (ret)
346 goto out;
347 vbatt_sum += data;
348 ret = measure_current(info, &data);
349 if (ret)
350 goto out;
351 ibatt_sum += data;
352 }
353 vbatt_avg = vbatt_sum / 10;
354 ibatt_avg = ibatt_sum / 10;
355
356 mutex_lock(&info->lock);
357 if (info->present)
358 *ocv = vbatt_avg - ibatt_avg * info->resistor / 1000;
359 else
360 *ocv = vbatt_avg;
361 mutex_unlock(&info->lock);
362 dev_dbg(info->dev, "VBAT average:%d, OCV:%d\n", vbatt_avg, *ocv);
363 return 0;
364out:
365 return ret;
366}
367
368/* Calculate State of Charge (percent points) */
369static int calc_soc(struct pm860x_battery_info *info, int state, int *soc)
370{
371 int i;
372 int ocv;
373 int count;
374 int ret = -EINVAL;
375
376 if (!soc)
377 return -EINVAL;
378
379 switch (state) {
380 case OCV_MODE_ACTIVE:
381 ret = calc_ocv(info, &ocv);
382 break;
383 case OCV_MODE_SLEEP:
384 ret = measure_vbatt(info, OCV_MODE_SLEEP, &ocv);
385 break;
386 }
387 if (ret)
388 return ret;
389
390 count = ARRAY_SIZE(array_soc);
391 if (ocv < array_soc[count - 1][0]) {
392 *soc = 0;
393 return 0;
394 }
395
396 for (i = 0; i < count; i++) {
397 if (ocv >= array_soc[i][0]) {
398 *soc = array_soc[i][1];
399 break;
400 }
401 }
402 return 0;
403}
404
405static irqreturn_t pm860x_coulomb_handler(int irq, void *data)
406{
407 struct pm860x_battery_info *info = data;
408
409 calc_ccnt(info, &ccnt_data);
410 return IRQ_HANDLED;
411}
412
413static irqreturn_t pm860x_batt_handler(int irq, void *data)
414{
415 struct pm860x_battery_info *info = data;
416 int ret;
417
418 mutex_lock(&info->lock);
419 ret = pm860x_reg_read(info->i2c, PM8607_STATUS_2);
420 if (ret & STATUS2_BAT) {
421 info->present = 1;
422 info->temp_type = PM860X_TEMP_TBAT;
423 } else {
424 info->present = 0;
425 info->temp_type = PM860X_TEMP_TINT;
426 }
427 mutex_unlock(&info->lock);
428 /* clear ccnt since battery is attached or dettached */
429 clear_ccnt(info, &ccnt_data);
430 return IRQ_HANDLED;
431}
432
433static void pm860x_init_battery(struct pm860x_battery_info *info)
434{
435 unsigned char buf[2];
436 int ret;
437 int data;
438 int bat_remove;
439 int soc;
440
441 /* measure enable on GPADC1 */
442 data = MEAS1_GP1;
443 if (info->temp_type == PM860X_TEMP_TINT)
444 data |= MEAS1_TINT;
445 ret = pm860x_set_bits(info->i2c, PM8607_MEAS_EN1, data, data);
446 if (ret)
447 goto out;
448
449 /* measure enable on IBAT, BAT_DET, CC. IBAT is depend on CC. */
450 data = MEAS3_IBAT | MEAS3_BAT_DET | MEAS3_CC;
451 ret = pm860x_set_bits(info->i2c, PM8607_MEAS_EN3, data, data);
452 if (ret)
453 goto out;
454
455 /* measure disable CC in sleep time */
456 ret = pm860x_reg_write(info->i2c, PM8607_MEAS_OFF_TIME1, 0x82);
457 if (ret)
458 goto out;
459 ret = pm860x_reg_write(info->i2c, PM8607_MEAS_OFF_TIME2, 0x6c);
460 if (ret)
461 goto out;
462
463 /* enable GPADC */
464 ret = pm860x_set_bits(info->i2c, PM8607_GPADC_MISC1,
465 GPMISC1_GPADC_EN, GPMISC1_GPADC_EN);
466 if (ret < 0)
467 goto out;
468
469 /* detect battery via GPADC1 */
470 ret = pm860x_set_bits(info->i2c, PM8607_CHG_CTRL6,
471 CC6_BAT_DET_GPADC1, CC6_BAT_DET_GPADC1);
472 if (ret < 0)
473 goto out;
474
475 ret = pm860x_set_bits(info->i2c, PM8607_CCNT, 7 << 3,
476 CCNT_AVG_SEL);
477 if (ret < 0)
478 goto out;
479
480 /* set GPADC1 bias */
481 ret = pm860x_set_bits(info->i2c, PM8607_GP_BIAS2, 0xF << 4,
482 GPBIAS2_GPADC1_SET);
483 if (ret < 0)
484 goto out;
485
486 /* check whether battery present) */
487 mutex_lock(&info->lock);
488 ret = pm860x_reg_read(info->i2c, PM8607_STATUS_2);
489 if (ret < 0) {
490 mutex_unlock(&info->lock);
491 goto out;
492 }
493 if (ret & STATUS2_BAT) {
494 info->present = 1;
495 info->temp_type = PM860X_TEMP_TBAT;
496 } else {
497 info->present = 0;
498 info->temp_type = PM860X_TEMP_TINT;
499 }
500 mutex_unlock(&info->lock);
501
502 calc_soc(info, OCV_MODE_ACTIVE, &soc);
503
504 data = pm860x_reg_read(info->i2c, PM8607_POWER_UP_LOG);
505 bat_remove = data & BAT_WU_LOG;
506
507 dev_dbg(info->dev, "battery wake up? %s\n",
508 bat_remove != 0 ? "yes" : "no");
509
510 /* restore SOC from RTC domain register */
511 if (bat_remove == 0) {
512 buf[0] = pm860x_reg_read(info->i2c, PM8607_RTC_MISC2);
513 buf[1] = pm860x_reg_read(info->i2c, PM8607_RTC1);
514 data = ((buf[1] & 0x3) << 5) | ((buf[0] >> 3) & 0x1F);
515 if (data > soc + 15)
516 info->start_soc = soc;
517 else if (data < soc - 15)
518 info->start_soc = soc;
519 else
520 info->start_soc = data;
521 dev_dbg(info->dev, "soc_rtc %d, soc_ocv :%d\n", data, soc);
522 } else {
523 pm860x_set_bits(info->i2c, PM8607_POWER_UP_LOG,
524 BAT_WU_LOG, BAT_WU_LOG);
525 info->start_soc = soc;
526 }
527 info->last_capacity = info->start_soc;
528 dev_dbg(info->dev, "init soc : %d\n", info->last_capacity);
529out:
530 return;
531}
532
533static void set_temp_threshold(struct pm860x_battery_info *info,
534 int min, int max)
535{
536 int data;
537
538 /* (tmp << 8) / 1800 */
539 if (min <= 0)
540 data = 0;
541 else
542 data = (min << 8) / 1800;
543 pm860x_reg_write(info->i2c, PM8607_GPADC1_HIGHTH, data);
544 dev_dbg(info->dev, "TEMP_HIGHTH : min: %d, 0x%x\n", min, data);
545
546 if (max <= 0)
547 data = 0xff;
548 else
549 data = (max << 8) / 1800;
550 pm860x_reg_write(info->i2c, PM8607_GPADC1_LOWTH, data);
551 dev_dbg(info->dev, "TEMP_LOWTH:max : %d, 0x%x\n", max, data);
552}
553
554static int measure_temp(struct pm860x_battery_info *info, int *data)
555{
556 int ret;
557 int temp;
558 int min;
559 int max;
560
561 if (info->temp_type == PM860X_TEMP_TINT) {
562 ret = measure_12bit_voltage(info, PM8607_TINT_MEAS1, data);
563 if (ret)
564 return ret;
565 *data = (*data - 884) * 1000 / 3611;
566 } else {
567 ret = measure_12bit_voltage(info, PM8607_GPADC1_MEAS1, data);
568 if (ret)
569 return ret;
570 /* meausered Vtbat(mV) / Ibias_current(11uA)*/
571 *data = (*data * 1000) / GPBIAS2_GPADC1_UA;
572
573 if (*data > TBAT_NEG_25D) {
574 temp = -30; /* over cold , suppose -30 roughly */
575 max = TBAT_NEG_10D * GPBIAS2_GPADC1_UA / 1000;
576 set_temp_threshold(info, 0, max);
577 } else if (*data > TBAT_NEG_10D) {
578 temp = -15; /* -15 degree, code */
579 max = TBAT_NEG_10D * GPBIAS2_GPADC1_UA / 1000;
580 set_temp_threshold(info, 0, max);
581 } else if (*data > TBAT_0D) {
582 temp = -5; /* -5 degree */
583 min = TBAT_NEG_10D * GPBIAS2_GPADC1_UA / 1000;
584 max = TBAT_40D * GPBIAS2_GPADC1_UA / 1000;
585 set_temp_threshold(info, min, max);
586 } else if (*data > TBAT_10D) {
587 temp = 5; /* in range of (0, 10) */
588 min = TBAT_NEG_10D * GPBIAS2_GPADC1_UA / 1000;
589 max = TBAT_40D * GPBIAS2_GPADC1_UA / 1000;
590 set_temp_threshold(info, min, max);
591 } else if (*data > TBAT_20D) {
592 temp = 15; /* in range of (10, 20) */
593 min = TBAT_NEG_10D * GPBIAS2_GPADC1_UA / 1000;
594 max = TBAT_40D * GPBIAS2_GPADC1_UA / 1000;
595 set_temp_threshold(info, min, max);
596 } else if (*data > TBAT_30D) {
597 temp = 25; /* in range of (20, 30) */
598 min = TBAT_NEG_10D * GPBIAS2_GPADC1_UA / 1000;
599 max = TBAT_40D * GPBIAS2_GPADC1_UA / 1000;
600 set_temp_threshold(info, min, max);
601 } else if (*data > TBAT_40D) {
602 temp = 35; /* in range of (30, 40) */
603 min = TBAT_NEG_10D * GPBIAS2_GPADC1_UA / 1000;
604 max = TBAT_40D * GPBIAS2_GPADC1_UA / 1000;
605 set_temp_threshold(info, min, max);
606 } else {
607 min = TBAT_40D * GPBIAS2_GPADC1_UA / 1000;
608 set_temp_threshold(info, min, 0);
609 temp = 45; /* over heat ,suppose 45 roughly */
610 }
611
612 dev_dbg(info->dev, "temp_C:%d C,temp_mv:%d mv\n", temp, *data);
613 *data = temp;
614 }
615 return 0;
616}
617
618static int calc_resistor(struct pm860x_battery_info *info)
619{
620 int vbatt_sum1;
621 int vbatt_sum2;
622 int chg_current;
623 int ibatt_sum1;
624 int ibatt_sum2;
625 int data;
626 int ret;
627 int i;
628
629 ret = measure_current(info, &data);
630 /* make sure that charging is launched by data > 0 */
631 if (ret || data < 0)
632 goto out;
633
634 ret = measure_vbatt(info, OCV_MODE_ACTIVE, &data);
635 if (ret)
636 goto out;
637 /* calculate resistor only in CC charge mode */
638 if (data < VBATT_RESISTOR_MIN || data > VBATT_RESISTOR_MAX)
639 goto out;
640
641 /* current is saved */
642 if (set_charger_current(info, 500, &chg_current))
643 goto out;
644
645 /*
646 * set charge current as 500mA, wait about 500ms till charging
647 * process is launched and stable with the newer charging current.
648 */
649 msleep(500);
650
651 for (i = 0, vbatt_sum1 = 0, ibatt_sum1 = 0; i < 10; i++) {
652 ret = measure_vbatt(info, OCV_MODE_ACTIVE, &data);
653 if (ret)
654 goto out_meas;
655 vbatt_sum1 += data;
656 ret = measure_current(info, &data);
657 if (ret)
658 goto out_meas;
659
660 if (data < 0)
661 ibatt_sum1 = ibatt_sum1 - data; /* discharging */
662 else
663 ibatt_sum1 = ibatt_sum1 + data; /* charging */
664 }
665
666 if (set_charger_current(info, 100, &ret))
667 goto out_meas;
668 /*
669 * set charge current as 100mA, wait about 500ms till charging
670 * process is launched and stable with the newer charging current.
671 */
672 msleep(500);
673
674 for (i = 0, vbatt_sum2 = 0, ibatt_sum2 = 0; i < 10; i++) {
675 ret = measure_vbatt(info, OCV_MODE_ACTIVE, &data);
676 if (ret)
677 goto out_meas;
678 vbatt_sum2 += data;
679 ret = measure_current(info, &data);
680 if (ret)
681 goto out_meas;
682
683 if (data < 0)
684 ibatt_sum2 = ibatt_sum2 - data; /* discharging */
685 else
686 ibatt_sum2 = ibatt_sum2 + data; /* charging */
687 }
688
689 /* restore current setting */
690 if (set_charger_current(info, chg_current, &ret))
691 goto out_meas;
692
693 if ((vbatt_sum1 > vbatt_sum2) && (ibatt_sum1 > ibatt_sum2) &&
694 (ibatt_sum2 > 0)) {
695 /* calculate resistor in discharging case */
696 data = 1000 * (vbatt_sum1 - vbatt_sum2)
697 / (ibatt_sum1 - ibatt_sum2);
698 if ((data - info->resistor > 0) &&
699 (data - info->resistor < info->resistor))
700 info->resistor = data;
701 if ((info->resistor - data > 0) &&
702 (info->resistor - data < data))
703 info->resistor = data;
704 }
705 return 0;
706
707out_meas:
708 set_charger_current(info, chg_current, &ret);
709out:
710 return -EINVAL;
711}
712
713static int calc_capacity(struct pm860x_battery_info *info, int *cap)
714{
715 int ret;
716 int data;
717 int ibat;
718 int cap_ocv = 0;
719 int cap_cc = 0;
720
721 ret = calc_ccnt(info, &ccnt_data);
722 if (ret)
723 goto out;
724soc:
725 data = info->max_capacity * info->start_soc / 100;
726 if (ccnt_data.total_dischg - ccnt_data.total_chg <= data) {
727 cap_cc =
728 data + ccnt_data.total_chg - ccnt_data.total_dischg;
729 } else {
730 clear_ccnt(info, &ccnt_data);
731 calc_soc(info, OCV_MODE_ACTIVE, &info->start_soc);
732 dev_dbg(info->dev, "restart soc = %d !\n",
733 info->start_soc);
734 goto soc;
735 }
736
737 cap_cc = cap_cc * 100 / info->max_capacity;
738 if (cap_cc < 0)
739 cap_cc = 0;
740 else if (cap_cc > 100)
741 cap_cc = 100;
742
743 dev_dbg(info->dev, "%s, last cap : %d", __func__,
744 info->last_capacity);
745
746 ret = measure_current(info, &ibat);
747 if (ret)
748 goto out;
749 /* Calculate the capacity when discharging(ibat < 0) */
750 if (ibat < 0) {
751 ret = calc_soc(info, OCV_MODE_ACTIVE, &cap_ocv);
752 if (ret)
753 cap_ocv = info->last_capacity;
754 ret = measure_vbatt(info, OCV_MODE_ACTIVE, &data);
755 if (ret)
756 goto out;
757 if (data <= LOW_BAT_THRESHOLD) {
758 /* choose the lower capacity value to report
759 * between vbat and CC when vbat < 3.6v;
760 * than 3.6v;
761 */
762 *cap = min(cap_ocv, cap_cc);
763 } else {
764 /* when detect vbat > 3.6v, but cap_cc < 15,and
765 * cap_ocv is 10% larger than cap_cc, we can think
766 * CC have some accumulation error, switch to OCV
767 * to estimate capacity;
768 * */
769 if (cap_cc < 15 && cap_ocv - cap_cc > 10)
770 *cap = cap_ocv;
771 else
772 *cap = cap_cc;
773 }
774 /* when discharging, make sure current capacity
775 * is lower than last*/
776 if (*cap > info->last_capacity)
777 *cap = info->last_capacity;
778 } else {
779 *cap = cap_cc;
780 }
781 info->last_capacity = *cap;
782
783 dev_dbg(info->dev, "%s, cap_ocv:%d cap_cc:%d, cap:%d\n",
784 (ibat < 0) ? "discharging" : "charging",
785 cap_ocv, cap_cc, *cap);
786 /*
787 * store the current capacity to RTC domain register,
788 * after next power up , it will be restored.
789 */
790 pm860x_set_bits(info->i2c, PM8607_RTC_MISC2, RTC_SOC_5LSB,
791 (*cap & 0x1F) << 3);
792 pm860x_set_bits(info->i2c, PM8607_RTC1, RTC_SOC_3MSB,
793 ((*cap >> 5) & 0x3));
794 return 0;
795out:
796 return ret;
797}
798
799static void pm860x_external_power_changed(struct power_supply *psy)
800{
801 struct pm860x_battery_info *info;
802
803 info = container_of(psy, struct pm860x_battery_info, battery);
804 calc_resistor(info);
805}
806
807static int pm860x_batt_get_prop(struct power_supply *psy,
808 enum power_supply_property psp,
809 union power_supply_propval *val)
810{
811 struct pm860x_battery_info *info = dev_get_drvdata(psy->dev->parent);
812 int data;
813 int ret;
814
815 switch (psp) {
816 case POWER_SUPPLY_PROP_PRESENT:
817 val->intval = info->present;
818 break;
819 case POWER_SUPPLY_PROP_CAPACITY:
820 ret = calc_capacity(info, &data);
821 if (ret)
822 return ret;
823 if (data < 0)
824 data = 0;
825 else if (data > 100)
826 data = 100;
827 /* return 100 if battery is not attached */
828 if (!info->present)
829 data = 100;
830 val->intval = data;
831 break;
832 case POWER_SUPPLY_PROP_TECHNOLOGY:
833 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
834 break;
835 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
836 /* return real vbatt Voltage */
837 ret = measure_vbatt(info, OCV_MODE_ACTIVE, &data);
838 if (ret)
839 return ret;
840 val->intval = data * 1000;
841 break;
842 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
843 /* return Open Circuit Voltage (not measured voltage) */
844 ret = calc_ocv(info, &data);
845 if (ret)
846 return ret;
847 val->intval = data * 1000;
848 break;
849 case POWER_SUPPLY_PROP_CURRENT_NOW:
850 ret = measure_current(info, &data);
851 if (ret)
852 return ret;
853 val->intval = data;
854 break;
855 case POWER_SUPPLY_PROP_TEMP:
856 if (info->present) {
857 ret = measure_temp(info, &data);
858 if (ret)
859 return ret;
860 data *= 10;
861 } else {
862 /* Fake Temp 25C Without Battery */
863 data = 250;
864 }
865 val->intval = data;
866 break;
867 default:
868 return -ENODEV;
869 }
870 return 0;
871}
872
873static int pm860x_batt_set_prop(struct power_supply *psy,
874 enum power_supply_property psp,
875 const union power_supply_propval *val)
876{
877 struct pm860x_battery_info *info = dev_get_drvdata(psy->dev->parent);
878
879 switch (psp) {
880 case POWER_SUPPLY_PROP_CHARGE_FULL:
881 clear_ccnt(info, &ccnt_data);
882 info->start_soc = 100;
883 dev_dbg(info->dev, "chg done, update soc = %d\n",
884 info->start_soc);
885 break;
886 default:
887 return -EPERM;
888 }
889
890 return 0;
891}
892
893
894static enum power_supply_property pm860x_batt_props[] = {
895 POWER_SUPPLY_PROP_PRESENT,
896 POWER_SUPPLY_PROP_CAPACITY,
897 POWER_SUPPLY_PROP_TECHNOLOGY,
898 POWER_SUPPLY_PROP_VOLTAGE_NOW,
899 POWER_SUPPLY_PROP_VOLTAGE_AVG,
900 POWER_SUPPLY_PROP_CURRENT_NOW,
901 POWER_SUPPLY_PROP_TEMP,
902};
903
904static int pm860x_battery_probe(struct platform_device *pdev)
905{
906 struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
907 struct pm860x_battery_info *info;
908 struct pm860x_power_pdata *pdata;
909 int ret;
910
911 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
912 if (!info)
913 return -ENOMEM;
914
915 info->irq_cc = platform_get_irq(pdev, 0);
916 if (info->irq_cc <= 0) {
917 dev_err(&pdev->dev, "No IRQ resource!\n");
918 return -EINVAL;
919 }
920
921 info->irq_batt = platform_get_irq(pdev, 1);
922 if (info->irq_batt <= 0) {
923 dev_err(&pdev->dev, "No IRQ resource!\n");
924 return -EINVAL;
925 }
926
927 info->chip = chip;
928 info->i2c =
929 (chip->id == CHIP_PM8607) ? chip->client : chip->companion;
930 info->dev = &pdev->dev;
931 info->status = POWER_SUPPLY_STATUS_UNKNOWN;
932 pdata = pdev->dev.platform_data;
933
934 mutex_init(&info->lock);
935 platform_set_drvdata(pdev, info);
936
937 pm860x_init_battery(info);
938
939 info->battery.name = "battery-monitor";
940 info->battery.type = POWER_SUPPLY_TYPE_BATTERY;
941 info->battery.properties = pm860x_batt_props;
942 info->battery.num_properties = ARRAY_SIZE(pm860x_batt_props);
943 info->battery.get_property = pm860x_batt_get_prop;
944 info->battery.set_property = pm860x_batt_set_prop;
945 info->battery.external_power_changed = pm860x_external_power_changed;
946
947 if (pdata && pdata->max_capacity)
948 info->max_capacity = pdata->max_capacity;
949 else
950 info->max_capacity = 1500; /* set default capacity */
951 if (pdata && pdata->resistor)
952 info->resistor = pdata->resistor;
953 else
954 info->resistor = 300; /* set default internal resistor */
955
956 ret = power_supply_register(&pdev->dev, &info->battery);
957 if (ret)
958 return ret;
959 info->battery.dev->parent = &pdev->dev;
960
961 ret = request_threaded_irq(info->irq_cc, NULL,
962 pm860x_coulomb_handler, IRQF_ONESHOT,
963 "coulomb", info);
964 if (ret < 0) {
965 dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
966 info->irq_cc, ret);
967 goto out_reg;
968 }
969
970 ret = request_threaded_irq(info->irq_batt, NULL, pm860x_batt_handler,
971 IRQF_ONESHOT, "battery", info);
972 if (ret < 0) {
973 dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
974 info->irq_batt, ret);
975 goto out_coulomb;
976 }
977
978
979 return 0;
980
981out_coulomb:
982 free_irq(info->irq_cc, info);
983out_reg:
984 power_supply_unregister(&info->battery);
985 return ret;
986}
987
988static int pm860x_battery_remove(struct platform_device *pdev)
989{
990 struct pm860x_battery_info *info = platform_get_drvdata(pdev);
991
992 free_irq(info->irq_batt, info);
993 free_irq(info->irq_cc, info);
994 power_supply_unregister(&info->battery);
995 return 0;
996}
997
998#ifdef CONFIG_PM_SLEEP
999static int pm860x_battery_suspend(struct device *dev)
1000{
1001 struct platform_device *pdev = to_platform_device(dev);
1002 struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
1003
1004 if (device_may_wakeup(dev))
1005 chip->wakeup_flag |= 1 << PM8607_IRQ_CC;
1006 return 0;
1007}
1008
1009static int pm860x_battery_resume(struct device *dev)
1010{
1011 struct platform_device *pdev = to_platform_device(dev);
1012 struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
1013
1014 if (device_may_wakeup(dev))
1015 chip->wakeup_flag &= ~(1 << PM8607_IRQ_CC);
1016 return 0;
1017}
1018#endif
1019
1020static SIMPLE_DEV_PM_OPS(pm860x_battery_pm_ops,
1021 pm860x_battery_suspend, pm860x_battery_resume);
1022
1023static struct platform_driver pm860x_battery_driver = {
1024 .driver = {
1025 .name = "88pm860x-battery",
1026 .owner = THIS_MODULE,
1027 .pm = &pm860x_battery_pm_ops,
1028 },
1029 .probe = pm860x_battery_probe,
1030 .remove = pm860x_battery_remove,
1031};
1032module_platform_driver(pm860x_battery_driver);
1033
1034MODULE_DESCRIPTION("Marvell 88PM860x Battery driver");
1035MODULE_LICENSE("GPL");