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