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
96 struct 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
114 struct 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 */
128 static 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
151 static 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 */
measure_12bit_voltage(struct pm860x_battery_info * info,int offset,int * data)157 static 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
measure_vbatt(struct pm860x_battery_info * info,int state,int * data)173 static 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 */
measure_current(struct pm860x_battery_info * info,int * data)216 static 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
set_charger_current(struct pm860x_battery_info * info,int data,int * old)232 static 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
read_ccnt(struct pm860x_battery_info * info,int offset,int * ccnt)249 static 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;
263 out:
264 return ret;
265 }
266
calc_ccnt(struct pm860x_battery_info * info,struct ccnt * ccnt)267 static 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;
310 out:
311 return ret;
312 }
313
clear_ccnt(struct pm860x_battery_info * info,struct ccnt * ccnt)314 static 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 */
calc_ocv(struct pm860x_battery_info * info,int * ocv)330 static 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;
364 out:
365 return ret;
366 }
367
368 /* Calculate State of Charge (percent points) */
calc_soc(struct pm860x_battery_info * info,int state,int * soc)369 static 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
pm860x_coulomb_handler(int irq,void * data)405 static 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
pm860x_batt_handler(int irq,void * data)413 static 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
pm860x_init_battery(struct pm860x_battery_info * info)433 static 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 = 0;
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 ret = calc_soc(info, OCV_MODE_ACTIVE, &soc);
503 if (ret < 0)
504 goto out;
505
506 data = pm860x_reg_read(info->i2c, PM8607_POWER_UP_LOG);
507 bat_remove = data & BAT_WU_LOG;
508
509 dev_dbg(info->dev, "battery wake up? %s\n",
510 bat_remove != 0 ? "yes" : "no");
511
512 /* restore SOC from RTC domain register */
513 if (bat_remove == 0) {
514 buf[0] = pm860x_reg_read(info->i2c, PM8607_RTC_MISC2);
515 buf[1] = pm860x_reg_read(info->i2c, PM8607_RTC1);
516 data = ((buf[1] & 0x3) << 5) | ((buf[0] >> 3) & 0x1F);
517 if (data > soc + 15)
518 info->start_soc = soc;
519 else if (data < soc - 15)
520 info->start_soc = soc;
521 else
522 info->start_soc = data;
523 dev_dbg(info->dev, "soc_rtc %d, soc_ocv :%d\n", data, soc);
524 } else {
525 pm860x_set_bits(info->i2c, PM8607_POWER_UP_LOG,
526 BAT_WU_LOG, BAT_WU_LOG);
527 info->start_soc = soc;
528 }
529 info->last_capacity = info->start_soc;
530 dev_dbg(info->dev, "init soc : %d\n", info->last_capacity);
531 out:
532 return;
533 }
534
set_temp_threshold(struct pm860x_battery_info * info,int min,int max)535 static void set_temp_threshold(struct pm860x_battery_info *info,
536 int min, int max)
537 {
538 int data;
539
540 /* (tmp << 8) / 1800 */
541 if (min <= 0)
542 data = 0;
543 else
544 data = (min << 8) / 1800;
545 pm860x_reg_write(info->i2c, PM8607_GPADC1_HIGHTH, data);
546 dev_dbg(info->dev, "TEMP_HIGHTH : min: %d, 0x%x\n", min, data);
547
548 if (max <= 0)
549 data = 0xff;
550 else
551 data = (max << 8) / 1800;
552 pm860x_reg_write(info->i2c, PM8607_GPADC1_LOWTH, data);
553 dev_dbg(info->dev, "TEMP_LOWTH:max : %d, 0x%x\n", max, data);
554 }
555
measure_temp(struct pm860x_battery_info * info,int * data)556 static int measure_temp(struct pm860x_battery_info *info, int *data)
557 {
558 int ret;
559 int temp;
560 int min;
561 int max;
562
563 if (info->temp_type == PM860X_TEMP_TINT) {
564 ret = measure_12bit_voltage(info, PM8607_TINT_MEAS1, data);
565 if (ret)
566 return ret;
567 *data = (*data - 884) * 1000 / 3611;
568 } else {
569 ret = measure_12bit_voltage(info, PM8607_GPADC1_MEAS1, data);
570 if (ret)
571 return ret;
572 /* meausered Vtbat(mV) / Ibias_current(11uA)*/
573 *data = (*data * 1000) / GPBIAS2_GPADC1_UA;
574
575 if (*data > TBAT_NEG_25D) {
576 temp = -30; /* over cold , suppose -30 roughly */
577 max = TBAT_NEG_10D * GPBIAS2_GPADC1_UA / 1000;
578 set_temp_threshold(info, 0, max);
579 } else if (*data > TBAT_NEG_10D) {
580 temp = -15; /* -15 degree, code */
581 max = TBAT_NEG_10D * GPBIAS2_GPADC1_UA / 1000;
582 set_temp_threshold(info, 0, max);
583 } else if (*data > TBAT_0D) {
584 temp = -5; /* -5 degree */
585 min = TBAT_NEG_10D * GPBIAS2_GPADC1_UA / 1000;
586 max = TBAT_40D * GPBIAS2_GPADC1_UA / 1000;
587 set_temp_threshold(info, min, max);
588 } else if (*data > TBAT_10D) {
589 temp = 5; /* in range of (0, 10) */
590 min = TBAT_NEG_10D * GPBIAS2_GPADC1_UA / 1000;
591 max = TBAT_40D * GPBIAS2_GPADC1_UA / 1000;
592 set_temp_threshold(info, min, max);
593 } else if (*data > TBAT_20D) {
594 temp = 15; /* in range of (10, 20) */
595 min = TBAT_NEG_10D * GPBIAS2_GPADC1_UA / 1000;
596 max = TBAT_40D * GPBIAS2_GPADC1_UA / 1000;
597 set_temp_threshold(info, min, max);
598 } else if (*data > TBAT_30D) {
599 temp = 25; /* in range of (20, 30) */
600 min = TBAT_NEG_10D * GPBIAS2_GPADC1_UA / 1000;
601 max = TBAT_40D * GPBIAS2_GPADC1_UA / 1000;
602 set_temp_threshold(info, min, max);
603 } else if (*data > TBAT_40D) {
604 temp = 35; /* in range of (30, 40) */
605 min = TBAT_NEG_10D * GPBIAS2_GPADC1_UA / 1000;
606 max = TBAT_40D * GPBIAS2_GPADC1_UA / 1000;
607 set_temp_threshold(info, min, max);
608 } else {
609 min = TBAT_40D * GPBIAS2_GPADC1_UA / 1000;
610 set_temp_threshold(info, min, 0);
611 temp = 45; /* over heat ,suppose 45 roughly */
612 }
613
614 dev_dbg(info->dev, "temp_C:%d C,temp_mv:%d mv\n", temp, *data);
615 *data = temp;
616 }
617 return 0;
618 }
619
calc_resistor(struct pm860x_battery_info * info)620 static int calc_resistor(struct pm860x_battery_info *info)
621 {
622 int vbatt_sum1;
623 int vbatt_sum2;
624 int chg_current;
625 int ibatt_sum1;
626 int ibatt_sum2;
627 int data;
628 int ret;
629 int i;
630
631 ret = measure_current(info, &data);
632 /* make sure that charging is launched by data > 0 */
633 if (ret || data < 0)
634 goto out;
635
636 ret = measure_vbatt(info, OCV_MODE_ACTIVE, &data);
637 if (ret)
638 goto out;
639 /* calculate resistor only in CC charge mode */
640 if (data < VBATT_RESISTOR_MIN || data > VBATT_RESISTOR_MAX)
641 goto out;
642
643 /* current is saved */
644 if (set_charger_current(info, 500, &chg_current))
645 goto out;
646
647 /*
648 * set charge current as 500mA, wait about 500ms till charging
649 * process is launched and stable with the newer charging current.
650 */
651 msleep(500);
652
653 for (i = 0, vbatt_sum1 = 0, ibatt_sum1 = 0; i < 10; i++) {
654 ret = measure_vbatt(info, OCV_MODE_ACTIVE, &data);
655 if (ret)
656 goto out_meas;
657 vbatt_sum1 += data;
658 ret = measure_current(info, &data);
659 if (ret)
660 goto out_meas;
661
662 if (data < 0)
663 ibatt_sum1 = ibatt_sum1 - data; /* discharging */
664 else
665 ibatt_sum1 = ibatt_sum1 + data; /* charging */
666 }
667
668 if (set_charger_current(info, 100, &ret))
669 goto out_meas;
670 /*
671 * set charge current as 100mA, wait about 500ms till charging
672 * process is launched and stable with the newer charging current.
673 */
674 msleep(500);
675
676 for (i = 0, vbatt_sum2 = 0, ibatt_sum2 = 0; i < 10; i++) {
677 ret = measure_vbatt(info, OCV_MODE_ACTIVE, &data);
678 if (ret)
679 goto out_meas;
680 vbatt_sum2 += data;
681 ret = measure_current(info, &data);
682 if (ret)
683 goto out_meas;
684
685 if (data < 0)
686 ibatt_sum2 = ibatt_sum2 - data; /* discharging */
687 else
688 ibatt_sum2 = ibatt_sum2 + data; /* charging */
689 }
690
691 /* restore current setting */
692 if (set_charger_current(info, chg_current, &ret))
693 goto out_meas;
694
695 if ((vbatt_sum1 > vbatt_sum2) && (ibatt_sum1 > ibatt_sum2) &&
696 (ibatt_sum2 > 0)) {
697 /* calculate resistor in discharging case */
698 data = 1000 * (vbatt_sum1 - vbatt_sum2)
699 / (ibatt_sum1 - ibatt_sum2);
700 if ((data - info->resistor > 0) &&
701 (data - info->resistor < info->resistor))
702 info->resistor = data;
703 if ((info->resistor - data > 0) &&
704 (info->resistor - data < data))
705 info->resistor = data;
706 }
707 return 0;
708
709 out_meas:
710 set_charger_current(info, chg_current, &ret);
711 out:
712 return -EINVAL;
713 }
714
calc_capacity(struct pm860x_battery_info * info,int * cap)715 static int calc_capacity(struct pm860x_battery_info *info, int *cap)
716 {
717 int ret;
718 int data;
719 int ibat;
720 int cap_ocv = 0;
721 int cap_cc = 0;
722
723 ret = calc_ccnt(info, &ccnt_data);
724 if (ret)
725 goto out;
726 soc:
727 data = info->max_capacity * info->start_soc / 100;
728 if (ccnt_data.total_dischg - ccnt_data.total_chg <= data) {
729 cap_cc =
730 data + ccnt_data.total_chg - ccnt_data.total_dischg;
731 } else {
732 clear_ccnt(info, &ccnt_data);
733 calc_soc(info, OCV_MODE_ACTIVE, &info->start_soc);
734 dev_dbg(info->dev, "restart soc = %d !\n",
735 info->start_soc);
736 goto soc;
737 }
738
739 cap_cc = cap_cc * 100 / info->max_capacity;
740 if (cap_cc < 0)
741 cap_cc = 0;
742 else if (cap_cc > 100)
743 cap_cc = 100;
744
745 dev_dbg(info->dev, "%s, last cap : %d", __func__,
746 info->last_capacity);
747
748 ret = measure_current(info, &ibat);
749 if (ret)
750 goto out;
751 /* Calculate the capacity when discharging(ibat < 0) */
752 if (ibat < 0) {
753 ret = calc_soc(info, OCV_MODE_ACTIVE, &cap_ocv);
754 if (ret)
755 cap_ocv = info->last_capacity;
756 ret = measure_vbatt(info, OCV_MODE_ACTIVE, &data);
757 if (ret)
758 goto out;
759 if (data <= LOW_BAT_THRESHOLD) {
760 /* choose the lower capacity value to report
761 * between vbat and CC when vbat < 3.6v;
762 * than 3.6v;
763 */
764 *cap = min(cap_ocv, cap_cc);
765 } else {
766 /* when detect vbat > 3.6v, but cap_cc < 15,and
767 * cap_ocv is 10% larger than cap_cc, we can think
768 * CC have some accumulation error, switch to OCV
769 * to estimate capacity;
770 * */
771 if (cap_cc < 15 && cap_ocv - cap_cc > 10)
772 *cap = cap_ocv;
773 else
774 *cap = cap_cc;
775 }
776 /* when discharging, make sure current capacity
777 * is lower than last*/
778 if (*cap > info->last_capacity)
779 *cap = info->last_capacity;
780 } else {
781 *cap = cap_cc;
782 }
783 info->last_capacity = *cap;
784
785 dev_dbg(info->dev, "%s, cap_ocv:%d cap_cc:%d, cap:%d\n",
786 (ibat < 0) ? "discharging" : "charging",
787 cap_ocv, cap_cc, *cap);
788 /*
789 * store the current capacity to RTC domain register,
790 * after next power up , it will be restored.
791 */
792 pm860x_set_bits(info->i2c, PM8607_RTC_MISC2, RTC_SOC_5LSB,
793 (*cap & 0x1F) << 3);
794 pm860x_set_bits(info->i2c, PM8607_RTC1, RTC_SOC_3MSB,
795 ((*cap >> 5) & 0x3));
796 return 0;
797 out:
798 return ret;
799 }
800
pm860x_external_power_changed(struct power_supply * psy)801 static void pm860x_external_power_changed(struct power_supply *psy)
802 {
803 struct pm860x_battery_info *info = dev_get_drvdata(psy->dev.parent);
804
805 calc_resistor(info);
806 }
807
pm860x_batt_get_prop(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)808 static int pm860x_batt_get_prop(struct power_supply *psy,
809 enum power_supply_property psp,
810 union power_supply_propval *val)
811 {
812 struct pm860x_battery_info *info = dev_get_drvdata(psy->dev.parent);
813 int data;
814 int ret;
815
816 switch (psp) {
817 case POWER_SUPPLY_PROP_PRESENT:
818 val->intval = info->present;
819 break;
820 case POWER_SUPPLY_PROP_CAPACITY:
821 ret = calc_capacity(info, &data);
822 if (ret)
823 return ret;
824 if (data < 0)
825 data = 0;
826 else if (data > 100)
827 data = 100;
828 /* return 100 if battery is not attached */
829 if (!info->present)
830 data = 100;
831 val->intval = data;
832 break;
833 case POWER_SUPPLY_PROP_TECHNOLOGY:
834 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
835 break;
836 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
837 /* return real vbatt Voltage */
838 ret = measure_vbatt(info, OCV_MODE_ACTIVE, &data);
839 if (ret)
840 return ret;
841 val->intval = data * 1000;
842 break;
843 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
844 /* return Open Circuit Voltage (not measured voltage) */
845 ret = calc_ocv(info, &data);
846 if (ret)
847 return ret;
848 val->intval = data * 1000;
849 break;
850 case POWER_SUPPLY_PROP_CURRENT_NOW:
851 ret = measure_current(info, &data);
852 if (ret)
853 return ret;
854 val->intval = data;
855 break;
856 case POWER_SUPPLY_PROP_TEMP:
857 if (info->present) {
858 ret = measure_temp(info, &data);
859 if (ret)
860 return ret;
861 data *= 10;
862 } else {
863 /* Fake Temp 25C Without Battery */
864 data = 250;
865 }
866 val->intval = data;
867 break;
868 default:
869 return -ENODEV;
870 }
871 return 0;
872 }
873
pm860x_batt_set_prop(struct power_supply * psy,enum power_supply_property psp,const union power_supply_propval * val)874 static int pm860x_batt_set_prop(struct power_supply *psy,
875 enum power_supply_property psp,
876 const union power_supply_propval *val)
877 {
878 struct pm860x_battery_info *info = dev_get_drvdata(psy->dev.parent);
879
880 switch (psp) {
881 case POWER_SUPPLY_PROP_CHARGE_FULL:
882 clear_ccnt(info, &ccnt_data);
883 info->start_soc = 100;
884 dev_dbg(info->dev, "chg done, update soc = %d\n",
885 info->start_soc);
886 break;
887 default:
888 return -EPERM;
889 }
890
891 return 0;
892 }
893
894
895 static enum power_supply_property pm860x_batt_props[] = {
896 POWER_SUPPLY_PROP_PRESENT,
897 POWER_SUPPLY_PROP_CAPACITY,
898 POWER_SUPPLY_PROP_TECHNOLOGY,
899 POWER_SUPPLY_PROP_VOLTAGE_NOW,
900 POWER_SUPPLY_PROP_VOLTAGE_AVG,
901 POWER_SUPPLY_PROP_CURRENT_NOW,
902 POWER_SUPPLY_PROP_TEMP,
903 };
904
905 static const struct power_supply_desc pm860x_battery_desc = {
906 .name = "battery-monitor",
907 .type = POWER_SUPPLY_TYPE_BATTERY,
908 .properties = pm860x_batt_props,
909 .num_properties = ARRAY_SIZE(pm860x_batt_props),
910 .get_property = pm860x_batt_get_prop,
911 .set_property = pm860x_batt_set_prop,
912 .external_power_changed = pm860x_external_power_changed,
913 };
914
pm860x_battery_probe(struct platform_device * pdev)915 static int pm860x_battery_probe(struct platform_device *pdev)
916 {
917 struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
918 struct pm860x_battery_info *info;
919 struct pm860x_power_pdata *pdata;
920 int ret;
921
922 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
923 if (!info)
924 return -ENOMEM;
925
926 info->irq_cc = platform_get_irq(pdev, 0);
927 if (info->irq_cc <= 0) {
928 dev_err(&pdev->dev, "No IRQ resource!\n");
929 return -EINVAL;
930 }
931
932 info->irq_batt = platform_get_irq(pdev, 1);
933 if (info->irq_batt <= 0) {
934 dev_err(&pdev->dev, "No IRQ resource!\n");
935 return -EINVAL;
936 }
937
938 info->chip = chip;
939 info->i2c =
940 (chip->id == CHIP_PM8607) ? chip->client : chip->companion;
941 info->dev = &pdev->dev;
942 info->status = POWER_SUPPLY_STATUS_UNKNOWN;
943 pdata = pdev->dev.platform_data;
944
945 mutex_init(&info->lock);
946 platform_set_drvdata(pdev, info);
947
948 pm860x_init_battery(info);
949
950 if (pdata && pdata->max_capacity)
951 info->max_capacity = pdata->max_capacity;
952 else
953 info->max_capacity = 1500; /* set default capacity */
954 if (pdata && pdata->resistor)
955 info->resistor = pdata->resistor;
956 else
957 info->resistor = 300; /* set default internal resistor */
958
959 info->battery = devm_power_supply_register(&pdev->dev,
960 &pm860x_battery_desc,
961 NULL);
962 if (IS_ERR(info->battery))
963 return PTR_ERR(info->battery);
964 info->battery->dev.parent = &pdev->dev;
965
966 ret = devm_request_threaded_irq(chip->dev, info->irq_cc, NULL,
967 pm860x_coulomb_handler, IRQF_ONESHOT,
968 "coulomb", info);
969 if (ret < 0) {
970 dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
971 info->irq_cc, ret);
972 return ret;
973 }
974
975 ret = devm_request_threaded_irq(chip->dev, info->irq_batt, NULL,
976 pm860x_batt_handler,
977 IRQF_ONESHOT, "battery", info);
978 if (ret < 0) {
979 dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
980 info->irq_batt, ret);
981 return ret;
982 }
983
984
985 return 0;
986 }
987
988 #ifdef CONFIG_PM_SLEEP
pm860x_battery_suspend(struct device * dev)989 static int pm860x_battery_suspend(struct device *dev)
990 {
991 struct platform_device *pdev = to_platform_device(dev);
992 struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
993
994 if (device_may_wakeup(dev))
995 chip->wakeup_flag |= 1 << PM8607_IRQ_CC;
996 return 0;
997 }
998
pm860x_battery_resume(struct device * dev)999 static int pm860x_battery_resume(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 #endif
1009
1010 static SIMPLE_DEV_PM_OPS(pm860x_battery_pm_ops,
1011 pm860x_battery_suspend, pm860x_battery_resume);
1012
1013 static struct platform_driver pm860x_battery_driver = {
1014 .driver = {
1015 .name = "88pm860x-battery",
1016 .pm = &pm860x_battery_pm_ops,
1017 },
1018 .probe = pm860x_battery_probe,
1019 };
1020 module_platform_driver(pm860x_battery_driver);
1021
1022 MODULE_DESCRIPTION("Marvell 88PM860x Battery driver");
1023 MODULE_LICENSE("GPL");
1024