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1/*
2 * Battery driver for Maxim MAX8925
3 *
4 * Copyright (c) 2009-2010 Marvell International Ltd.
5 * Haojian Zhuang <haojian.zhuang@marvell.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
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/* registers in GPM */
23#define MAX8925_OUT5VEN 0x54
24#define MAX8925_OUT3VEN 0x58
25#define MAX8925_CHG_CNTL1 0x7c
26
27/* bits definition */
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/* registers in ADC */
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/* 2 bytes registers in below. MSB is 1st, LSB is 2nd. */
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; /* detecing MB by ID pin */
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 /* enable charger in platform */
93 if (info->set_charger)
94 info->set_charger(1);
95 /* enable charger */
96 max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 0);
97 } else {
98 /* disable charge */
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 /* Battery is not ready yet */
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 /* Battery is ready now */
133 dev_dbg(chip->dev, "Battery temperature is in range\n");
134 break;
135 case MAX8925_IRQ_VCHG_SYSLOW_R:
136 /* VSYS is low */
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; /* unit is uV */
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; /* unit is uV */
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; /* unit is uV */
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 /* assume r_sns is 0.02 */
290 ret = ((ret * 6250) - 3125) /* uA */;
291 val->intval = 0;
292 if (ret > 0)
293 val->intval = ret; /* unit is mA */
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
350#define REQUEST_IRQ(_irq, _name) \
351do { \
352 ret = request_threaded_irq(chip->irq_base + _irq, NULL, \
353 max8925_charger_handler, \
354 IRQF_ONESHOT, _name, info); \
355 if (ret) \
356 dev_err(chip->dev, "Failed to request IRQ #%d: %d\n", \
357 _irq, ret); \
358} while (0)
359
360static int max8925_init_charger(struct max8925_chip *chip,
361 struct max8925_power_info *info)
362{
363 int ret;
364
365 REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_OVP, "ac-ovp");
366 if (!info->no_insert_detect) {
367 REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_F, "ac-remove");
368 REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_R, "ac-insert");
369 }
370 if (!info->no_temp_support) {
371 REQUEST_IRQ(MAX8925_IRQ_VCHG_THM_OK_R, "batt-temp-in-range");
372 REQUEST_IRQ(MAX8925_IRQ_VCHG_THM_OK_F, "batt-temp-out-range");
373 }
374 REQUEST_IRQ(MAX8925_IRQ_VCHG_SYSLOW_F, "vsys-high");
375 REQUEST_IRQ(MAX8925_IRQ_VCHG_SYSLOW_R, "vsys-low");
376 REQUEST_IRQ(MAX8925_IRQ_VCHG_RST, "charger-reset");
377 REQUEST_IRQ(MAX8925_IRQ_VCHG_DONE, "charger-done");
378 REQUEST_IRQ(MAX8925_IRQ_VCHG_TOPOFF, "charger-topoff");
379 REQUEST_IRQ(MAX8925_IRQ_VCHG_TMR_FAULT, "charger-timer-expire");
380
381 info->usb_online = 0;
382 info->bat_online = 0;
383
384 /* check for power - can miss interrupt at boot time */
385 if (start_measure(info, MEASURE_VCHG) * 2000 > 500000)
386 info->ac_online = 1;
387 else
388 info->ac_online = 0;
389
390 ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
391 if (ret >= 0) {
392 /*
393 * If battery detection is enabled, ID pin of battery is
394 * connected to MBDET pin of MAX8925. It could be used to
395 * detect battery presence.
396 * Otherwise, we have to assume that battery is always on.
397 */
398 if (info->batt_detect)
399 info->bat_online = (ret & MAX8925_CHG_MBDET) ? 0 : 1;
400 else
401 info->bat_online = 1;
402 if (ret & MAX8925_CHG_AC_RANGE_MASK)
403 info->ac_online = 1;
404 else
405 info->ac_online = 0;
406 }
407 /* disable charge */
408 max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 1 << 7);
409 /* set charging current in charge topoff mode */
410 max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 3 << 5,
411 info->topoff_threshold << 5);
412 /* set charing current in fast charge mode */
413 max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 7, info->fast_charge);
414
415 return 0;
416}
417
418static int max8925_deinit_charger(struct max8925_power_info *info)
419{
420 struct max8925_chip *chip = info->chip;
421 int irq;
422
423 irq = chip->irq_base + MAX8925_IRQ_VCHG_DC_OVP;
424 for (; irq <= chip->irq_base + MAX8925_IRQ_VCHG_TMR_FAULT; irq++)
425 free_irq(irq, info);
426
427 return 0;
428}
429
430#ifdef CONFIG_OF
431static struct max8925_power_pdata *
432max8925_power_dt_init(struct platform_device *pdev)
433{
434 struct device_node *nproot = pdev->dev.parent->of_node;
435 struct device_node *np;
436 int batt_detect;
437 int topoff_threshold;
438 int fast_charge;
439 int no_temp_support;
440 int no_insert_detect;
441 struct max8925_power_pdata *pdata;
442
443 if (!nproot)
444 return pdev->dev.platform_data;
445
446 np = of_find_node_by_name(nproot, "charger");
447 if (!np) {
448 dev_err(&pdev->dev, "failed to find charger node\n");
449 return NULL;
450 }
451
452 pdata = devm_kzalloc(&pdev->dev,
453 sizeof(struct max8925_power_pdata),
454 GFP_KERNEL);
455
456 of_property_read_u32(np, "topoff-threshold", &topoff_threshold);
457 of_property_read_u32(np, "batt-detect", &batt_detect);
458 of_property_read_u32(np, "fast-charge", &fast_charge);
459 of_property_read_u32(np, "no-insert-detect", &no_insert_detect);
460 of_property_read_u32(np, "no-temp-support", &no_temp_support);
461 of_node_put(np);
462
463 pdata->batt_detect = batt_detect;
464 pdata->fast_charge = fast_charge;
465 pdata->topoff_threshold = topoff_threshold;
466 pdata->no_insert_detect = no_insert_detect;
467 pdata->no_temp_support = no_temp_support;
468
469 return pdata;
470}
471#else
472static struct max8925_power_pdata *
473max8925_power_dt_init(struct platform_device *pdev)
474{
475 return pdev->dev.platform_data;
476}
477#endif
478
479static int max8925_power_probe(struct platform_device *pdev)
480{
481 struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
482 struct max8925_power_pdata *pdata = NULL;
483 struct max8925_power_info *info;
484 int ret;
485
486 pdata = max8925_power_dt_init(pdev);
487 if (!pdata) {
488 dev_err(&pdev->dev, "platform data isn't assigned to "
489 "power supply\n");
490 return -EINVAL;
491 }
492
493 info = devm_kzalloc(&pdev->dev, sizeof(struct max8925_power_info),
494 GFP_KERNEL);
495 if (!info)
496 return -ENOMEM;
497 info->chip = chip;
498 info->gpm = chip->i2c;
499 info->adc = chip->adc;
500 platform_set_drvdata(pdev, info);
501
502 info->ac.name = "max8925-ac";
503 info->ac.type = POWER_SUPPLY_TYPE_MAINS;
504 info->ac.properties = max8925_ac_props;
505 info->ac.num_properties = ARRAY_SIZE(max8925_ac_props);
506 info->ac.get_property = max8925_ac_get_prop;
507 info->ac.supplied_to = pdata->supplied_to;
508 info->ac.num_supplicants = pdata->num_supplicants;
509 ret = power_supply_register(&pdev->dev, &info->ac);
510 if (ret)
511 goto out;
512 info->ac.dev->parent = &pdev->dev;
513
514 info->usb.name = "max8925-usb";
515 info->usb.type = POWER_SUPPLY_TYPE_USB;
516 info->usb.properties = max8925_usb_props;
517 info->usb.num_properties = ARRAY_SIZE(max8925_usb_props);
518 info->usb.get_property = max8925_usb_get_prop;
519 info->usb.supplied_to = pdata->supplied_to;
520 info->usb.num_supplicants = pdata->num_supplicants;
521
522 ret = power_supply_register(&pdev->dev, &info->usb);
523 if (ret)
524 goto out_usb;
525 info->usb.dev->parent = &pdev->dev;
526
527 info->battery.name = "max8925-battery";
528 info->battery.type = POWER_SUPPLY_TYPE_BATTERY;
529 info->battery.properties = max8925_battery_props;
530 info->battery.num_properties = ARRAY_SIZE(max8925_battery_props);
531 info->battery.get_property = max8925_bat_get_prop;
532 ret = power_supply_register(&pdev->dev, &info->battery);
533 if (ret)
534 goto out_battery;
535 info->battery.dev->parent = &pdev->dev;
536
537 info->batt_detect = pdata->batt_detect;
538 info->topoff_threshold = pdata->topoff_threshold;
539 info->fast_charge = pdata->fast_charge;
540 info->set_charger = pdata->set_charger;
541 info->no_temp_support = pdata->no_temp_support;
542 info->no_insert_detect = pdata->no_insert_detect;
543
544 max8925_init_charger(chip, info);
545 return 0;
546out_battery:
547 power_supply_unregister(&info->battery);
548out_usb:
549 power_supply_unregister(&info->ac);
550out:
551 return ret;
552}
553
554static int max8925_power_remove(struct platform_device *pdev)
555{
556 struct max8925_power_info *info = platform_get_drvdata(pdev);
557
558 if (info) {
559 power_supply_unregister(&info->ac);
560 power_supply_unregister(&info->usb);
561 power_supply_unregister(&info->battery);
562 max8925_deinit_charger(info);
563 }
564 return 0;
565}
566
567static struct platform_driver max8925_power_driver = {
568 .probe = max8925_power_probe,
569 .remove = max8925_power_remove,
570 .driver = {
571 .name = "max8925-power",
572 },
573};
574
575module_platform_driver(max8925_power_driver);
576
577MODULE_LICENSE("GPL");
578MODULE_DESCRIPTION("Power supply driver for MAX8925");
579MODULE_ALIAS("platform:max8925-power");