1
2
3
4
5
6
7
8
9
10
11
12#include <linux/module.h>
13#include <linux/err.h>
14#include <linux/slab.h>
15#include <linux/of.h>
16#include <linux/i2c.h>
17#include <linux/interrupt.h>
18#include <linux/platform_device.h>
19#include <linux/power_supply.h>
20#include <linux/mfd/max8925.h>
21
22
23#define MAX8925_OUT5VEN 0x54
24#define MAX8925_OUT3VEN 0x58
25#define MAX8925_CHG_CNTL1 0x7c
26
27
28#define MAX8925_CHG_STAT_VSYSLOW (1 << 0)
29#define MAX8925_CHG_STAT_MODE_MASK (3 << 2)
30#define MAX8925_CHG_STAT_EN_MASK (1 << 4)
31#define MAX8925_CHG_MBDET (1 << 1)
32#define MAX8925_CHG_AC_RANGE_MASK (3 << 6)
33
34
35#define MAX8925_ADC_RES_CNFG1 0x06
36#define MAX8925_ADC_AVG_CNFG1 0x07
37#define MAX8925_ADC_ACQ_CNFG1 0x08
38#define MAX8925_ADC_ACQ_CNFG2 0x09
39
40#define MAX8925_ADC_AUX2 0x62
41#define MAX8925_ADC_VCHG 0x64
42#define MAX8925_ADC_VBBATT 0x66
43#define MAX8925_ADC_VMBATT 0x68
44#define MAX8925_ADC_ISNS 0x6a
45#define MAX8925_ADC_THM 0x6c
46#define MAX8925_ADC_TDIE 0x6e
47#define MAX8925_CMD_AUX2 0xc8
48#define MAX8925_CMD_VCHG 0xd0
49#define MAX8925_CMD_VBBATT 0xd8
50#define MAX8925_CMD_VMBATT 0xe0
51#define MAX8925_CMD_ISNS 0xe8
52#define MAX8925_CMD_THM 0xf0
53#define MAX8925_CMD_TDIE 0xf8
54
55enum {
56 MEASURE_AUX2,
57 MEASURE_VCHG,
58 MEASURE_VBBATT,
59 MEASURE_VMBATT,
60 MEASURE_ISNS,
61 MEASURE_THM,
62 MEASURE_TDIE,
63 MEASURE_MAX,
64};
65
66struct max8925_power_info {
67 struct max8925_chip *chip;
68 struct i2c_client *gpm;
69 struct i2c_client *adc;
70
71 struct power_supply *ac;
72 struct power_supply *usb;
73 struct power_supply *battery;
74 int irq_base;
75 unsigned ac_online:1;
76 unsigned usb_online:1;
77 unsigned bat_online:1;
78 unsigned chg_mode:2;
79 unsigned batt_detect:1;
80 unsigned topoff_threshold:2;
81 unsigned fast_charge:3;
82 unsigned no_temp_support:1;
83 unsigned no_insert_detect:1;
84
85 int (*set_charger) (int);
86};
87
88static int __set_charger(struct max8925_power_info *info, int enable)
89{
90 struct max8925_chip *chip = info->chip;
91 if (enable) {
92
93 if (info->set_charger)
94 info->set_charger(1);
95
96 max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 0);
97 } else {
98
99 max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 1 << 7);
100 if (info->set_charger)
101 info->set_charger(0);
102 }
103 dev_dbg(chip->dev, "%s\n", (enable) ? "Enable charger"
104 : "Disable charger");
105 return 0;
106}
107
108static irqreturn_t max8925_charger_handler(int irq, void *data)
109{
110 struct max8925_power_info *info = (struct max8925_power_info *)data;
111 struct max8925_chip *chip = info->chip;
112
113 switch (irq - chip->irq_base) {
114 case MAX8925_IRQ_VCHG_DC_R:
115 info->ac_online = 1;
116 __set_charger(info, 1);
117 dev_dbg(chip->dev, "Adapter inserted\n");
118 break;
119 case MAX8925_IRQ_VCHG_DC_F:
120 info->ac_online = 0;
121 __set_charger(info, 0);
122 dev_dbg(chip->dev, "Adapter removed\n");
123 break;
124 case MAX8925_IRQ_VCHG_THM_OK_F:
125
126 dev_dbg(chip->dev, "Battery temperature is out of range\n");
127 case MAX8925_IRQ_VCHG_DC_OVP:
128 dev_dbg(chip->dev, "Error detection\n");
129 __set_charger(info, 0);
130 break;
131 case MAX8925_IRQ_VCHG_THM_OK_R:
132
133 dev_dbg(chip->dev, "Battery temperature is in range\n");
134 break;
135 case MAX8925_IRQ_VCHG_SYSLOW_R:
136
137 dev_info(chip->dev, "Sys power is too low\n");
138 break;
139 case MAX8925_IRQ_VCHG_SYSLOW_F:
140 dev_dbg(chip->dev, "Sys power is above low threshold\n");
141 break;
142 case MAX8925_IRQ_VCHG_DONE:
143 __set_charger(info, 0);
144 dev_dbg(chip->dev, "Charging is done\n");
145 break;
146 case MAX8925_IRQ_VCHG_TOPOFF:
147 dev_dbg(chip->dev, "Charging in top-off mode\n");
148 break;
149 case MAX8925_IRQ_VCHG_TMR_FAULT:
150 __set_charger(info, 0);
151 dev_dbg(chip->dev, "Safe timer is expired\n");
152 break;
153 case MAX8925_IRQ_VCHG_RST:
154 __set_charger(info, 0);
155 dev_dbg(chip->dev, "Charger is reset\n");
156 break;
157 }
158 return IRQ_HANDLED;
159}
160
161static int start_measure(struct max8925_power_info *info, int type)
162{
163 unsigned char buf[2] = {0, 0};
164 int meas_cmd;
165 int meas_reg = 0, ret;
166
167 switch (type) {
168 case MEASURE_VCHG:
169 meas_cmd = MAX8925_CMD_VCHG;
170 meas_reg = MAX8925_ADC_VCHG;
171 break;
172 case MEASURE_VBBATT:
173 meas_cmd = MAX8925_CMD_VBBATT;
174 meas_reg = MAX8925_ADC_VBBATT;
175 break;
176 case MEASURE_VMBATT:
177 meas_cmd = MAX8925_CMD_VMBATT;
178 meas_reg = MAX8925_ADC_VMBATT;
179 break;
180 case MEASURE_ISNS:
181 meas_cmd = MAX8925_CMD_ISNS;
182 meas_reg = MAX8925_ADC_ISNS;
183 break;
184 default:
185 return -EINVAL;
186 }
187
188 max8925_reg_write(info->adc, meas_cmd, 0);
189 max8925_bulk_read(info->adc, meas_reg, 2, buf);
190 ret = ((buf[0]<<8) | buf[1]) >> 4;
191
192 return ret;
193}
194
195static int max8925_ac_get_prop(struct power_supply *psy,
196 enum power_supply_property psp,
197 union power_supply_propval *val)
198{
199 struct max8925_power_info *info = dev_get_drvdata(psy->dev.parent);
200 int ret = 0;
201
202 switch (psp) {
203 case POWER_SUPPLY_PROP_ONLINE:
204 val->intval = info->ac_online;
205 break;
206 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
207 if (info->ac_online) {
208 ret = start_measure(info, MEASURE_VCHG);
209 if (ret >= 0) {
210 val->intval = ret * 2000;
211 goto out;
212 }
213 }
214 ret = -ENODATA;
215 break;
216 default:
217 ret = -ENODEV;
218 break;
219 }
220out:
221 return ret;
222}
223
224static enum power_supply_property max8925_ac_props[] = {
225 POWER_SUPPLY_PROP_ONLINE,
226 POWER_SUPPLY_PROP_VOLTAGE_NOW,
227};
228
229static int max8925_usb_get_prop(struct power_supply *psy,
230 enum power_supply_property psp,
231 union power_supply_propval *val)
232{
233 struct max8925_power_info *info = dev_get_drvdata(psy->dev.parent);
234 int ret = 0;
235
236 switch (psp) {
237 case POWER_SUPPLY_PROP_ONLINE:
238 val->intval = info->usb_online;
239 break;
240 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
241 if (info->usb_online) {
242 ret = start_measure(info, MEASURE_VCHG);
243 if (ret >= 0) {
244 val->intval = ret * 2000;
245 goto out;
246 }
247 }
248 ret = -ENODATA;
249 break;
250 default:
251 ret = -ENODEV;
252 break;
253 }
254out:
255 return ret;
256}
257
258static enum power_supply_property max8925_usb_props[] = {
259 POWER_SUPPLY_PROP_ONLINE,
260 POWER_SUPPLY_PROP_VOLTAGE_NOW,
261};
262
263static int max8925_bat_get_prop(struct power_supply *psy,
264 enum power_supply_property psp,
265 union power_supply_propval *val)
266{
267 struct max8925_power_info *info = dev_get_drvdata(psy->dev.parent);
268 int ret = 0;
269
270 switch (psp) {
271 case POWER_SUPPLY_PROP_ONLINE:
272 val->intval = info->bat_online;
273 break;
274 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
275 if (info->bat_online) {
276 ret = start_measure(info, MEASURE_VMBATT);
277 if (ret >= 0) {
278 val->intval = ret * 2000;
279 ret = 0;
280 break;
281 }
282 }
283 ret = -ENODATA;
284 break;
285 case POWER_SUPPLY_PROP_CURRENT_NOW:
286 if (info->bat_online) {
287 ret = start_measure(info, MEASURE_ISNS);
288 if (ret >= 0) {
289
290 ret = ((ret * 6250) - 3125) ;
291 val->intval = 0;
292 if (ret > 0)
293 val->intval = ret;
294 ret = 0;
295 break;
296 }
297 }
298 ret = -ENODATA;
299 break;
300 case POWER_SUPPLY_PROP_CHARGE_TYPE:
301 if (!info->bat_online) {
302 ret = -ENODATA;
303 break;
304 }
305 ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
306 ret = (ret & MAX8925_CHG_STAT_MODE_MASK) >> 2;
307 switch (ret) {
308 case 1:
309 val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
310 break;
311 case 0:
312 case 2:
313 val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
314 break;
315 case 3:
316 val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
317 break;
318 }
319 ret = 0;
320 break;
321 case POWER_SUPPLY_PROP_STATUS:
322 if (!info->bat_online) {
323 ret = -ENODATA;
324 break;
325 }
326 ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
327 if (info->usb_online || info->ac_online) {
328 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
329 if (ret & MAX8925_CHG_STAT_EN_MASK)
330 val->intval = POWER_SUPPLY_STATUS_CHARGING;
331 } else
332 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
333 ret = 0;
334 break;
335 default:
336 ret = -ENODEV;
337 break;
338 }
339 return ret;
340}
341
342static enum power_supply_property max8925_battery_props[] = {
343 POWER_SUPPLY_PROP_ONLINE,
344 POWER_SUPPLY_PROP_VOLTAGE_NOW,
345 POWER_SUPPLY_PROP_CURRENT_NOW,
346 POWER_SUPPLY_PROP_CHARGE_TYPE,
347 POWER_SUPPLY_PROP_STATUS,
348};
349
350static const struct power_supply_desc ac_desc = {
351 .name = "max8925-ac",
352 .type = POWER_SUPPLY_TYPE_MAINS,
353 .properties = max8925_ac_props,
354 .num_properties = ARRAY_SIZE(max8925_ac_props),
355 .get_property = max8925_ac_get_prop,
356};
357
358static const struct power_supply_desc usb_desc = {
359 .name = "max8925-usb",
360 .type = POWER_SUPPLY_TYPE_USB,
361 .properties = max8925_usb_props,
362 .num_properties = ARRAY_SIZE(max8925_usb_props),
363 .get_property = max8925_usb_get_prop,
364};
365
366static const struct power_supply_desc battery_desc = {
367 .name = "max8925-battery",
368 .type = POWER_SUPPLY_TYPE_BATTERY,
369 .properties = max8925_battery_props,
370 .num_properties = ARRAY_SIZE(max8925_battery_props),
371 .get_property = max8925_bat_get_prop,
372};
373
374#define REQUEST_IRQ(_irq, _name) \
375do { \
376 ret = request_threaded_irq(chip->irq_base + _irq, NULL, \
377 max8925_charger_handler, \
378 IRQF_ONESHOT, _name, info); \
379 if (ret) \
380 dev_err(chip->dev, "Failed to request IRQ #%d: %d\n", \
381 _irq, ret); \
382} while (0)
383
384static int max8925_init_charger(struct max8925_chip *chip,
385 struct max8925_power_info *info)
386{
387 int ret;
388
389 REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_OVP, "ac-ovp");
390 if (!info->no_insert_detect) {
391 REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_F, "ac-remove");
392 REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_R, "ac-insert");
393 }
394 if (!info->no_temp_support) {
395 REQUEST_IRQ(MAX8925_IRQ_VCHG_THM_OK_R, "batt-temp-in-range");
396 REQUEST_IRQ(MAX8925_IRQ_VCHG_THM_OK_F, "batt-temp-out-range");
397 }
398 REQUEST_IRQ(MAX8925_IRQ_VCHG_SYSLOW_F, "vsys-high");
399 REQUEST_IRQ(MAX8925_IRQ_VCHG_SYSLOW_R, "vsys-low");
400 REQUEST_IRQ(MAX8925_IRQ_VCHG_RST, "charger-reset");
401 REQUEST_IRQ(MAX8925_IRQ_VCHG_DONE, "charger-done");
402 REQUEST_IRQ(MAX8925_IRQ_VCHG_TOPOFF, "charger-topoff");
403 REQUEST_IRQ(MAX8925_IRQ_VCHG_TMR_FAULT, "charger-timer-expire");
404
405 info->usb_online = 0;
406 info->bat_online = 0;
407
408
409 if (start_measure(info, MEASURE_VCHG) * 2000 > 500000)
410 info->ac_online = 1;
411 else
412 info->ac_online = 0;
413
414 ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
415 if (ret >= 0) {
416
417
418
419
420
421
422 if (info->batt_detect)
423 info->bat_online = (ret & MAX8925_CHG_MBDET) ? 0 : 1;
424 else
425 info->bat_online = 1;
426 if (ret & MAX8925_CHG_AC_RANGE_MASK)
427 info->ac_online = 1;
428 else
429 info->ac_online = 0;
430 }
431
432 max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 1 << 7);
433
434 max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 3 << 5,
435 info->topoff_threshold << 5);
436
437 max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 7, info->fast_charge);
438
439 return 0;
440}
441
442static int max8925_deinit_charger(struct max8925_power_info *info)
443{
444 struct max8925_chip *chip = info->chip;
445 int irq;
446
447 irq = chip->irq_base + MAX8925_IRQ_VCHG_DC_OVP;
448 for (; irq <= chip->irq_base + MAX8925_IRQ_VCHG_TMR_FAULT; irq++)
449 free_irq(irq, info);
450
451 return 0;
452}
453
454#ifdef CONFIG_OF
455static struct max8925_power_pdata *
456max8925_power_dt_init(struct platform_device *pdev)
457{
458 struct device_node *nproot = pdev->dev.parent->of_node;
459 struct device_node *np;
460 int batt_detect;
461 int topoff_threshold;
462 int fast_charge;
463 int no_temp_support;
464 int no_insert_detect;
465 struct max8925_power_pdata *pdata;
466
467 if (!nproot)
468 return pdev->dev.platform_data;
469
470 np = of_get_child_by_name(nproot, "charger");
471 if (!np) {
472 dev_err(&pdev->dev, "failed to find charger node\n");
473 return NULL;
474 }
475
476 pdata = devm_kzalloc(&pdev->dev,
477 sizeof(struct max8925_power_pdata),
478 GFP_KERNEL);
479 if (!pdata)
480 goto ret;
481
482 of_property_read_u32(np, "topoff-threshold", &topoff_threshold);
483 of_property_read_u32(np, "batt-detect", &batt_detect);
484 of_property_read_u32(np, "fast-charge", &fast_charge);
485 of_property_read_u32(np, "no-insert-detect", &no_insert_detect);
486 of_property_read_u32(np, "no-temp-support", &no_temp_support);
487
488 pdata->batt_detect = batt_detect;
489 pdata->fast_charge = fast_charge;
490 pdata->topoff_threshold = topoff_threshold;
491 pdata->no_insert_detect = no_insert_detect;
492 pdata->no_temp_support = no_temp_support;
493
494ret:
495 of_node_put(np);
496 return pdata;
497}
498#else
499static struct max8925_power_pdata *
500max8925_power_dt_init(struct platform_device *pdev)
501{
502 return pdev->dev.platform_data;
503}
504#endif
505
506static int max8925_power_probe(struct platform_device *pdev)
507{
508 struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
509 struct power_supply_config psy_cfg = {};
510 struct max8925_power_pdata *pdata = NULL;
511 struct max8925_power_info *info;
512 int ret;
513
514 pdata = max8925_power_dt_init(pdev);
515 if (!pdata) {
516 dev_err(&pdev->dev, "platform data isn't assigned to "
517 "power supply\n");
518 return -EINVAL;
519 }
520
521 info = devm_kzalloc(&pdev->dev, sizeof(struct max8925_power_info),
522 GFP_KERNEL);
523 if (!info)
524 return -ENOMEM;
525 info->chip = chip;
526 info->gpm = chip->i2c;
527 info->adc = chip->adc;
528 platform_set_drvdata(pdev, info);
529
530 psy_cfg.supplied_to = pdata->supplied_to;
531 psy_cfg.num_supplicants = pdata->num_supplicants;
532
533 info->ac = power_supply_register(&pdev->dev, &ac_desc, &psy_cfg);
534 if (IS_ERR(info->ac)) {
535 ret = PTR_ERR(info->ac);
536 goto out;
537 }
538 info->ac->dev.parent = &pdev->dev;
539
540 info->usb = power_supply_register(&pdev->dev, &usb_desc, &psy_cfg);
541 if (IS_ERR(info->usb)) {
542 ret = PTR_ERR(info->usb);
543 goto out_unregister_ac;
544 }
545 info->usb->dev.parent = &pdev->dev;
546
547 info->battery = power_supply_register(&pdev->dev, &battery_desc, NULL);
548 if (IS_ERR(info->battery)) {
549 ret = PTR_ERR(info->battery);
550 goto out_unregister_usb;
551 }
552 info->battery->dev.parent = &pdev->dev;
553
554 info->batt_detect = pdata->batt_detect;
555 info->topoff_threshold = pdata->topoff_threshold;
556 info->fast_charge = pdata->fast_charge;
557 info->set_charger = pdata->set_charger;
558 info->no_temp_support = pdata->no_temp_support;
559 info->no_insert_detect = pdata->no_insert_detect;
560
561 max8925_init_charger(chip, info);
562 return 0;
563out_unregister_usb:
564 power_supply_unregister(info->usb);
565out_unregister_ac:
566 power_supply_unregister(info->ac);
567out:
568 return ret;
569}
570
571static int max8925_power_remove(struct platform_device *pdev)
572{
573 struct max8925_power_info *info = platform_get_drvdata(pdev);
574
575 if (info) {
576 power_supply_unregister(info->ac);
577 power_supply_unregister(info->usb);
578 power_supply_unregister(info->battery);
579 max8925_deinit_charger(info);
580 }
581 return 0;
582}
583
584static struct platform_driver max8925_power_driver = {
585 .probe = max8925_power_probe,
586 .remove = max8925_power_remove,
587 .driver = {
588 .name = "max8925-power",
589 },
590};
591
592module_platform_driver(max8925_power_driver);
593
594MODULE_LICENSE("GPL");
595MODULE_DESCRIPTION("Power supply driver for MAX8925");
596MODULE_ALIAS("platform:max8925-power");
597
