1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Battery driver for Maxim MAX8925
4 *
5 * Copyright (c) 2009-2010 Marvell International Ltd.
6 * Haojian Zhuang <haojian.zhuang@marvell.com>
7 */
8
9 #include <linux/module.h>
10 #include <linux/err.h>
11 #include <linux/slab.h>
12 #include <linux/of.h>
13 #include <linux/i2c.h>
14 #include <linux/interrupt.h>
15 #include <linux/platform_device.h>
16 #include <linux/power_supply.h>
17 #include <linux/mfd/max8925.h>
18
19 /* registers in GPM */
20 #define MAX8925_OUT5VEN 0x54
21 #define MAX8925_OUT3VEN 0x58
22 #define MAX8925_CHG_CNTL1 0x7c
23
24 /* bits definition */
25 #define MAX8925_CHG_STAT_VSYSLOW (1 << 0)
26 #define MAX8925_CHG_STAT_MODE_MASK (3 << 2)
27 #define MAX8925_CHG_STAT_EN_MASK (1 << 4)
28 #define MAX8925_CHG_MBDET (1 << 1)
29 #define MAX8925_CHG_AC_RANGE_MASK (3 << 6)
30
31 /* registers in ADC */
32 #define MAX8925_ADC_RES_CNFG1 0x06
33 #define MAX8925_ADC_AVG_CNFG1 0x07
34 #define MAX8925_ADC_ACQ_CNFG1 0x08
35 #define MAX8925_ADC_ACQ_CNFG2 0x09
36 /* 2 bytes registers in below. MSB is 1st, LSB is 2nd. */
37 #define MAX8925_ADC_AUX2 0x62
38 #define MAX8925_ADC_VCHG 0x64
39 #define MAX8925_ADC_VBBATT 0x66
40 #define MAX8925_ADC_VMBATT 0x68
41 #define MAX8925_ADC_ISNS 0x6a
42 #define MAX8925_ADC_THM 0x6c
43 #define MAX8925_ADC_TDIE 0x6e
44 #define MAX8925_CMD_AUX2 0xc8
45 #define MAX8925_CMD_VCHG 0xd0
46 #define MAX8925_CMD_VBBATT 0xd8
47 #define MAX8925_CMD_VMBATT 0xe0
48 #define MAX8925_CMD_ISNS 0xe8
49 #define MAX8925_CMD_THM 0xf0
50 #define MAX8925_CMD_TDIE 0xf8
51
52 enum {
53 MEASURE_AUX2,
54 MEASURE_VCHG,
55 MEASURE_VBBATT,
56 MEASURE_VMBATT,
57 MEASURE_ISNS,
58 MEASURE_THM,
59 MEASURE_TDIE,
60 MEASURE_MAX,
61 };
62
63 struct max8925_power_info {
64 struct max8925_chip *chip;
65 struct i2c_client *gpm;
66 struct i2c_client *adc;
67
68 struct power_supply *ac;
69 struct power_supply *usb;
70 struct power_supply *battery;
71 int irq_base;
72 unsigned ac_online:1;
73 unsigned usb_online:1;
74 unsigned bat_online:1;
75 unsigned chg_mode:2;
76 unsigned batt_detect:1; /* detecing MB by ID pin */
77 unsigned topoff_threshold:2;
78 unsigned fast_charge:3;
79 unsigned no_temp_support:1;
80 unsigned no_insert_detect:1;
81
82 int (*set_charger) (int);
83 };
84
__set_charger(struct max8925_power_info * info,int enable)85 static int __set_charger(struct max8925_power_info *info, int enable)
86 {
87 struct max8925_chip *chip = info->chip;
88 if (enable) {
89 /* enable charger in platform */
90 if (info->set_charger)
91 info->set_charger(1);
92 /* enable charger */
93 max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 0);
94 } else {
95 /* disable charge */
96 max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 1 << 7);
97 if (info->set_charger)
98 info->set_charger(0);
99 }
100 dev_dbg(chip->dev, "%s\n", (enable) ? "Enable charger"
101 : "Disable charger");
102 return 0;
103 }
104
max8925_charger_handler(int irq,void * data)105 static irqreturn_t max8925_charger_handler(int irq, void *data)
106 {
107 struct max8925_power_info *info = (struct max8925_power_info *)data;
108 struct max8925_chip *chip = info->chip;
109
110 switch (irq - chip->irq_base) {
111 case MAX8925_IRQ_VCHG_DC_R:
112 info->ac_online = 1;
113 __set_charger(info, 1);
114 dev_dbg(chip->dev, "Adapter inserted\n");
115 break;
116 case MAX8925_IRQ_VCHG_DC_F:
117 info->ac_online = 0;
118 __set_charger(info, 0);
119 dev_dbg(chip->dev, "Adapter removed\n");
120 break;
121 case MAX8925_IRQ_VCHG_THM_OK_F:
122 /* Battery is not ready yet */
123 dev_dbg(chip->dev, "Battery temperature is out of range\n");
124 fallthrough;
125 case MAX8925_IRQ_VCHG_DC_OVP:
126 dev_dbg(chip->dev, "Error detection\n");
127 __set_charger(info, 0);
128 break;
129 case MAX8925_IRQ_VCHG_THM_OK_R:
130 /* Battery is ready now */
131 dev_dbg(chip->dev, "Battery temperature is in range\n");
132 break;
133 case MAX8925_IRQ_VCHG_SYSLOW_R:
134 /* VSYS is low */
135 dev_info(chip->dev, "Sys power is too low\n");
136 break;
137 case MAX8925_IRQ_VCHG_SYSLOW_F:
138 dev_dbg(chip->dev, "Sys power is above low threshold\n");
139 break;
140 case MAX8925_IRQ_VCHG_DONE:
141 __set_charger(info, 0);
142 dev_dbg(chip->dev, "Charging is done\n");
143 break;
144 case MAX8925_IRQ_VCHG_TOPOFF:
145 dev_dbg(chip->dev, "Charging in top-off mode\n");
146 break;
147 case MAX8925_IRQ_VCHG_TMR_FAULT:
148 __set_charger(info, 0);
149 dev_dbg(chip->dev, "Safe timer is expired\n");
150 break;
151 case MAX8925_IRQ_VCHG_RST:
152 __set_charger(info, 0);
153 dev_dbg(chip->dev, "Charger is reset\n");
154 break;
155 }
156 return IRQ_HANDLED;
157 }
158
start_measure(struct max8925_power_info * info,int type)159 static int start_measure(struct max8925_power_info *info, int type)
160 {
161 unsigned char buf[2] = {0, 0};
162 int meas_cmd;
163 int meas_reg = 0, ret;
164
165 switch (type) {
166 case MEASURE_VCHG:
167 meas_cmd = MAX8925_CMD_VCHG;
168 meas_reg = MAX8925_ADC_VCHG;
169 break;
170 case MEASURE_VBBATT:
171 meas_cmd = MAX8925_CMD_VBBATT;
172 meas_reg = MAX8925_ADC_VBBATT;
173 break;
174 case MEASURE_VMBATT:
175 meas_cmd = MAX8925_CMD_VMBATT;
176 meas_reg = MAX8925_ADC_VMBATT;
177 break;
178 case MEASURE_ISNS:
179 meas_cmd = MAX8925_CMD_ISNS;
180 meas_reg = MAX8925_ADC_ISNS;
181 break;
182 default:
183 return -EINVAL;
184 }
185
186 max8925_reg_write(info->adc, meas_cmd, 0);
187 max8925_bulk_read(info->adc, meas_reg, 2, buf);
188 ret = ((buf[0]<<8) | buf[1]) >> 4;
189
190 return ret;
191 }
192
max8925_ac_get_prop(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)193 static int max8925_ac_get_prop(struct power_supply *psy,
194 enum power_supply_property psp,
195 union power_supply_propval *val)
196 {
197 struct max8925_power_info *info = dev_get_drvdata(psy->dev.parent);
198 int ret = 0;
199
200 switch (psp) {
201 case POWER_SUPPLY_PROP_ONLINE:
202 val->intval = info->ac_online;
203 break;
204 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
205 if (info->ac_online) {
206 ret = start_measure(info, MEASURE_VCHG);
207 if (ret >= 0) {
208 val->intval = ret * 2000; /* unit is uV */
209 goto out;
210 }
211 }
212 ret = -ENODATA;
213 break;
214 default:
215 ret = -ENODEV;
216 break;
217 }
218 out:
219 return ret;
220 }
221
222 static enum power_supply_property max8925_ac_props[] = {
223 POWER_SUPPLY_PROP_ONLINE,
224 POWER_SUPPLY_PROP_VOLTAGE_NOW,
225 };
226
max8925_usb_get_prop(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)227 static int max8925_usb_get_prop(struct power_supply *psy,
228 enum power_supply_property psp,
229 union power_supply_propval *val)
230 {
231 struct max8925_power_info *info = dev_get_drvdata(psy->dev.parent);
232 int ret = 0;
233
234 switch (psp) {
235 case POWER_SUPPLY_PROP_ONLINE:
236 val->intval = info->usb_online;
237 break;
238 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
239 if (info->usb_online) {
240 ret = start_measure(info, MEASURE_VCHG);
241 if (ret >= 0) {
242 val->intval = ret * 2000; /* unit is uV */
243 goto out;
244 }
245 }
246 ret = -ENODATA;
247 break;
248 default:
249 ret = -ENODEV;
250 break;
251 }
252 out:
253 return ret;
254 }
255
256 static enum power_supply_property max8925_usb_props[] = {
257 POWER_SUPPLY_PROP_ONLINE,
258 POWER_SUPPLY_PROP_VOLTAGE_NOW,
259 };
260
max8925_bat_get_prop(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)261 static int max8925_bat_get_prop(struct power_supply *psy,
262 enum power_supply_property psp,
263 union power_supply_propval *val)
264 {
265 struct max8925_power_info *info = dev_get_drvdata(psy->dev.parent);
266 int ret = 0;
267
268 switch (psp) {
269 case POWER_SUPPLY_PROP_ONLINE:
270 val->intval = info->bat_online;
271 break;
272 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
273 if (info->bat_online) {
274 ret = start_measure(info, MEASURE_VMBATT);
275 if (ret >= 0) {
276 val->intval = ret * 2000; /* unit is uV */
277 ret = 0;
278 break;
279 }
280 }
281 ret = -ENODATA;
282 break;
283 case POWER_SUPPLY_PROP_CURRENT_NOW:
284 if (info->bat_online) {
285 ret = start_measure(info, MEASURE_ISNS);
286 if (ret >= 0) {
287 /* assume r_sns is 0.02 */
288 ret = ((ret * 6250) - 3125) /* uA */;
289 val->intval = 0;
290 if (ret > 0)
291 val->intval = ret; /* unit is mA */
292 ret = 0;
293 break;
294 }
295 }
296 ret = -ENODATA;
297 break;
298 case POWER_SUPPLY_PROP_CHARGE_TYPE:
299 if (!info->bat_online) {
300 ret = -ENODATA;
301 break;
302 }
303 ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
304 ret = (ret & MAX8925_CHG_STAT_MODE_MASK) >> 2;
305 switch (ret) {
306 case 1:
307 val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
308 break;
309 case 0:
310 case 2:
311 val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
312 break;
313 case 3:
314 val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
315 break;
316 }
317 ret = 0;
318 break;
319 case POWER_SUPPLY_PROP_STATUS:
320 if (!info->bat_online) {
321 ret = -ENODATA;
322 break;
323 }
324 ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
325 if (info->usb_online || info->ac_online) {
326 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
327 if (ret & MAX8925_CHG_STAT_EN_MASK)
328 val->intval = POWER_SUPPLY_STATUS_CHARGING;
329 } else
330 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
331 ret = 0;
332 break;
333 default:
334 ret = -ENODEV;
335 break;
336 }
337 return ret;
338 }
339
340 static enum power_supply_property max8925_battery_props[] = {
341 POWER_SUPPLY_PROP_ONLINE,
342 POWER_SUPPLY_PROP_VOLTAGE_NOW,
343 POWER_SUPPLY_PROP_CURRENT_NOW,
344 POWER_SUPPLY_PROP_CHARGE_TYPE,
345 POWER_SUPPLY_PROP_STATUS,
346 };
347
348 static const struct power_supply_desc ac_desc = {
349 .name = "max8925-ac",
350 .type = POWER_SUPPLY_TYPE_MAINS,
351 .properties = max8925_ac_props,
352 .num_properties = ARRAY_SIZE(max8925_ac_props),
353 .get_property = max8925_ac_get_prop,
354 };
355
356 static const struct power_supply_desc usb_desc = {
357 .name = "max8925-usb",
358 .type = POWER_SUPPLY_TYPE_USB,
359 .properties = max8925_usb_props,
360 .num_properties = ARRAY_SIZE(max8925_usb_props),
361 .get_property = max8925_usb_get_prop,
362 };
363
364 static const struct power_supply_desc battery_desc = {
365 .name = "max8925-battery",
366 .type = POWER_SUPPLY_TYPE_BATTERY,
367 .properties = max8925_battery_props,
368 .num_properties = ARRAY_SIZE(max8925_battery_props),
369 .get_property = max8925_bat_get_prop,
370 };
371
372 #define REQUEST_IRQ(_irq, _name) \
373 do { \
374 ret = request_threaded_irq(chip->irq_base + _irq, NULL, \
375 max8925_charger_handler, \
376 IRQF_ONESHOT, _name, info); \
377 if (ret) \
378 dev_err(chip->dev, "Failed to request IRQ #%d: %d\n", \
379 _irq, ret); \
380 } while (0)
381
max8925_init_charger(struct max8925_chip * chip,struct max8925_power_info * info)382 static int max8925_init_charger(struct max8925_chip *chip,
383 struct max8925_power_info *info)
384 {
385 int ret;
386
387 REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_OVP, "ac-ovp");
388 if (!info->no_insert_detect) {
389 REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_F, "ac-remove");
390 REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_R, "ac-insert");
391 }
392 if (!info->no_temp_support) {
393 REQUEST_IRQ(MAX8925_IRQ_VCHG_THM_OK_R, "batt-temp-in-range");
394 REQUEST_IRQ(MAX8925_IRQ_VCHG_THM_OK_F, "batt-temp-out-range");
395 }
396 REQUEST_IRQ(MAX8925_IRQ_VCHG_SYSLOW_F, "vsys-high");
397 REQUEST_IRQ(MAX8925_IRQ_VCHG_SYSLOW_R, "vsys-low");
398 REQUEST_IRQ(MAX8925_IRQ_VCHG_RST, "charger-reset");
399 REQUEST_IRQ(MAX8925_IRQ_VCHG_DONE, "charger-done");
400 REQUEST_IRQ(MAX8925_IRQ_VCHG_TOPOFF, "charger-topoff");
401 REQUEST_IRQ(MAX8925_IRQ_VCHG_TMR_FAULT, "charger-timer-expire");
402
403 info->usb_online = 0;
404 info->bat_online = 0;
405
406 /* check for power - can miss interrupt at boot time */
407 if (start_measure(info, MEASURE_VCHG) * 2000 > 500000)
408 info->ac_online = 1;
409 else
410 info->ac_online = 0;
411
412 ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
413 if (ret >= 0) {
414 /*
415 * If battery detection is enabled, ID pin of battery is
416 * connected to MBDET pin of MAX8925. It could be used to
417 * detect battery presence.
418 * Otherwise, we have to assume that battery is always on.
419 */
420 if (info->batt_detect)
421 info->bat_online = (ret & MAX8925_CHG_MBDET) ? 0 : 1;
422 else
423 info->bat_online = 1;
424 if (ret & MAX8925_CHG_AC_RANGE_MASK)
425 info->ac_online = 1;
426 else
427 info->ac_online = 0;
428 }
429 /* disable charge */
430 max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 1 << 7);
431 /* set charging current in charge topoff mode */
432 max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 3 << 5,
433 info->topoff_threshold << 5);
434 /* set charing current in fast charge mode */
435 max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 7, info->fast_charge);
436
437 return 0;
438 }
439
max8925_deinit_charger(struct max8925_power_info * info)440 static int max8925_deinit_charger(struct max8925_power_info *info)
441 {
442 struct max8925_chip *chip = info->chip;
443 int irq;
444
445 irq = chip->irq_base + MAX8925_IRQ_VCHG_DC_OVP;
446 for (; irq <= chip->irq_base + MAX8925_IRQ_VCHG_TMR_FAULT; irq++)
447 free_irq(irq, info);
448
449 return 0;
450 }
451
452 #ifdef CONFIG_OF
453 static struct max8925_power_pdata *
max8925_power_dt_init(struct platform_device * pdev)454 max8925_power_dt_init(struct platform_device *pdev)
455 {
456 struct device_node *nproot = pdev->dev.parent->of_node;
457 struct device_node *np;
458 int batt_detect;
459 int topoff_threshold;
460 int fast_charge;
461 int no_temp_support;
462 int no_insert_detect;
463 struct max8925_power_pdata *pdata;
464
465 if (!nproot)
466 return pdev->dev.platform_data;
467
468 np = of_get_child_by_name(nproot, "charger");
469 if (!np) {
470 dev_err(&pdev->dev, "failed to find charger node\n");
471 return NULL;
472 }
473
474 pdata = devm_kzalloc(&pdev->dev,
475 sizeof(struct max8925_power_pdata),
476 GFP_KERNEL);
477 if (!pdata)
478 goto ret;
479
480 of_property_read_u32(np, "topoff-threshold", &topoff_threshold);
481 of_property_read_u32(np, "batt-detect", &batt_detect);
482 of_property_read_u32(np, "fast-charge", &fast_charge);
483 of_property_read_u32(np, "no-insert-detect", &no_insert_detect);
484 of_property_read_u32(np, "no-temp-support", &no_temp_support);
485
486 pdata->batt_detect = batt_detect;
487 pdata->fast_charge = fast_charge;
488 pdata->topoff_threshold = topoff_threshold;
489 pdata->no_insert_detect = no_insert_detect;
490 pdata->no_temp_support = no_temp_support;
491
492 ret:
493 of_node_put(np);
494 return pdata;
495 }
496 #else
497 static struct max8925_power_pdata *
max8925_power_dt_init(struct platform_device * pdev)498 max8925_power_dt_init(struct platform_device *pdev)
499 {
500 return pdev->dev.platform_data;
501 }
502 #endif
503
max8925_power_probe(struct platform_device * pdev)504 static int max8925_power_probe(struct platform_device *pdev)
505 {
506 struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
507 struct power_supply_config psy_cfg = {}; /* Only for ac and usb */
508 struct max8925_power_pdata *pdata = NULL;
509 struct max8925_power_info *info;
510 int ret;
511
512 pdata = max8925_power_dt_init(pdev);
513 if (!pdata) {
514 dev_err(&pdev->dev, "platform data isn't assigned to "
515 "power supply\n");
516 return -EINVAL;
517 }
518
519 info = devm_kzalloc(&pdev->dev, sizeof(struct max8925_power_info),
520 GFP_KERNEL);
521 if (!info)
522 return -ENOMEM;
523 info->chip = chip;
524 info->gpm = chip->i2c;
525 info->adc = chip->adc;
526 platform_set_drvdata(pdev, info);
527
528 psy_cfg.supplied_to = pdata->supplied_to;
529 psy_cfg.num_supplicants = pdata->num_supplicants;
530
531 info->ac = power_supply_register(&pdev->dev, &ac_desc, &psy_cfg);
532 if (IS_ERR(info->ac)) {
533 ret = PTR_ERR(info->ac);
534 goto out;
535 }
536 info->ac->dev.parent = &pdev->dev;
537
538 info->usb = power_supply_register(&pdev->dev, &usb_desc, &psy_cfg);
539 if (IS_ERR(info->usb)) {
540 ret = PTR_ERR(info->usb);
541 goto out_unregister_ac;
542 }
543 info->usb->dev.parent = &pdev->dev;
544
545 info->battery = power_supply_register(&pdev->dev, &battery_desc, NULL);
546 if (IS_ERR(info->battery)) {
547 ret = PTR_ERR(info->battery);
548 goto out_unregister_usb;
549 }
550 info->battery->dev.parent = &pdev->dev;
551
552 info->batt_detect = pdata->batt_detect;
553 info->topoff_threshold = pdata->topoff_threshold;
554 info->fast_charge = pdata->fast_charge;
555 info->set_charger = pdata->set_charger;
556 info->no_temp_support = pdata->no_temp_support;
557 info->no_insert_detect = pdata->no_insert_detect;
558
559 max8925_init_charger(chip, info);
560 return 0;
561 out_unregister_usb:
562 power_supply_unregister(info->usb);
563 out_unregister_ac:
564 power_supply_unregister(info->ac);
565 out:
566 return ret;
567 }
568
max8925_power_remove(struct platform_device * pdev)569 static int max8925_power_remove(struct platform_device *pdev)
570 {
571 struct max8925_power_info *info = platform_get_drvdata(pdev);
572
573 if (info) {
574 power_supply_unregister(info->ac);
575 power_supply_unregister(info->usb);
576 power_supply_unregister(info->battery);
577 max8925_deinit_charger(info);
578 }
579 return 0;
580 }
581
582 static struct platform_driver max8925_power_driver = {
583 .probe = max8925_power_probe,
584 .remove = max8925_power_remove,
585 .driver = {
586 .name = "max8925-power",
587 },
588 };
589
590 module_platform_driver(max8925_power_driver);
591
592 MODULE_LICENSE("GPL");
593 MODULE_DESCRIPTION("Power supply driver for MAX8925");
594 MODULE_ALIAS("platform:max8925-power");
595