Root/drivers/power/bq27x00_battery.c

1/*
2 * BQ27x00 battery driver
3 *
4 * Copyright (C) 2008 Rodolfo Giometti <giometti@linux.it>
5 * Copyright (C) 2008 Eurotech S.p.A. <info@eurotech.it>
6 * Copyright (C) 2010-2011 Lars-Peter Clausen <lars@metafoo.de>
7 * Copyright (C) 2011 Pali Rohár <pali.rohar@gmail.com>
8 *
9 * Based on a previous work by Copyright (C) 2008 Texas Instruments, Inc.
10 *
11 * This package is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 *
15 * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
17 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
18 *
19 */
20
21/*
22 * Datasheets:
23 * http://focus.ti.com/docs/prod/folders/print/bq27000.html
24 * http://focus.ti.com/docs/prod/folders/print/bq27500.html
25 * http://www.ti.com/product/bq27425-g1
26 */
27
28#include <linux/module.h>
29#include <linux/param.h>
30#include <linux/jiffies.h>
31#include <linux/workqueue.h>
32#include <linux/delay.h>
33#include <linux/platform_device.h>
34#include <linux/power_supply.h>
35#include <linux/idr.h>
36#include <linux/i2c.h>
37#include <linux/slab.h>
38#include <asm/unaligned.h>
39
40#include <linux/power/bq27x00_battery.h>
41
42#define DRIVER_VERSION "1.2.0"
43
44#define BQ27x00_REG_TEMP 0x06
45#define BQ27x00_REG_VOLT 0x08
46#define BQ27x00_REG_AI 0x14
47#define BQ27x00_REG_FLAGS 0x0A
48#define BQ27x00_REG_TTE 0x16
49#define BQ27x00_REG_TTF 0x18
50#define BQ27x00_REG_TTECP 0x26
51#define BQ27x00_REG_NAC 0x0C /* Nominal available capacity */
52#define BQ27x00_REG_LMD 0x12 /* Last measured discharge */
53#define BQ27x00_REG_CYCT 0x2A /* Cycle count total */
54#define BQ27x00_REG_AE 0x22 /* Available energy */
55#define BQ27x00_POWER_AVG 0x24
56
57#define BQ27000_REG_RSOC 0x0B /* Relative State-of-Charge */
58#define BQ27000_REG_ILMD 0x76 /* Initial last measured discharge */
59#define BQ27000_FLAG_EDVF BIT(0) /* Final End-of-Discharge-Voltage flag */
60#define BQ27000_FLAG_EDV1 BIT(1) /* First End-of-Discharge-Voltage flag */
61#define BQ27000_FLAG_CI BIT(4) /* Capacity Inaccurate flag */
62#define BQ27000_FLAG_FC BIT(5)
63#define BQ27000_FLAG_CHGS BIT(7) /* Charge state flag */
64
65#define BQ27500_REG_SOC 0x2C
66#define BQ27500_REG_DCAP 0x3C /* Design capacity */
67#define BQ27500_FLAG_DSC BIT(0)
68#define BQ27500_FLAG_SOCF BIT(1) /* State-of-Charge threshold final */
69#define BQ27500_FLAG_SOC1 BIT(2) /* State-of-Charge threshold 1 */
70#define BQ27500_FLAG_FC BIT(9)
71#define BQ27500_FLAG_OTC BIT(15)
72
73/* bq27425 register addresses are same as bq27x00 addresses minus 4 */
74#define BQ27425_REG_OFFSET 0x04
75#define BQ27425_REG_SOC 0x18 /* Register address plus offset */
76
77#define BQ27000_RS 20 /* Resistor sense */
78#define BQ27x00_POWER_CONSTANT (256 * 29200 / 1000)
79
80struct bq27x00_device_info;
81struct bq27x00_access_methods {
82    int (*read)(struct bq27x00_device_info *di, u8 reg, bool single);
83};
84
85enum bq27x00_chip { BQ27000, BQ27500, BQ27425};
86
87struct bq27x00_reg_cache {
88    int temperature;
89    int time_to_empty;
90    int time_to_empty_avg;
91    int time_to_full;
92    int charge_full;
93    int cycle_count;
94    int capacity;
95    int energy;
96    int flags;
97    int power_avg;
98    int health;
99};
100
101struct bq27x00_device_info {
102    struct device *dev;
103    int id;
104    enum bq27x00_chip chip;
105
106    struct bq27x00_reg_cache cache;
107    int charge_design_full;
108
109    unsigned long last_update;
110    struct delayed_work work;
111
112    struct power_supply bat;
113
114    struct bq27x00_access_methods bus;
115
116    struct mutex lock;
117};
118
119static enum power_supply_property bq27x00_battery_props[] = {
120    POWER_SUPPLY_PROP_STATUS,
121    POWER_SUPPLY_PROP_PRESENT,
122    POWER_SUPPLY_PROP_VOLTAGE_NOW,
123    POWER_SUPPLY_PROP_CURRENT_NOW,
124    POWER_SUPPLY_PROP_CAPACITY,
125    POWER_SUPPLY_PROP_CAPACITY_LEVEL,
126    POWER_SUPPLY_PROP_TEMP,
127    POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
128    POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
129    POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
130    POWER_SUPPLY_PROP_TECHNOLOGY,
131    POWER_SUPPLY_PROP_CHARGE_FULL,
132    POWER_SUPPLY_PROP_CHARGE_NOW,
133    POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
134    POWER_SUPPLY_PROP_CYCLE_COUNT,
135    POWER_SUPPLY_PROP_ENERGY_NOW,
136    POWER_SUPPLY_PROP_POWER_AVG,
137    POWER_SUPPLY_PROP_HEALTH,
138};
139
140static enum power_supply_property bq27425_battery_props[] = {
141    POWER_SUPPLY_PROP_STATUS,
142    POWER_SUPPLY_PROP_PRESENT,
143    POWER_SUPPLY_PROP_VOLTAGE_NOW,
144    POWER_SUPPLY_PROP_CURRENT_NOW,
145    POWER_SUPPLY_PROP_CAPACITY,
146    POWER_SUPPLY_PROP_CAPACITY_LEVEL,
147    POWER_SUPPLY_PROP_TEMP,
148    POWER_SUPPLY_PROP_TECHNOLOGY,
149    POWER_SUPPLY_PROP_CHARGE_FULL,
150    POWER_SUPPLY_PROP_CHARGE_NOW,
151    POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
152};
153
154static unsigned int poll_interval = 360;
155module_param(poll_interval, uint, 0644);
156MODULE_PARM_DESC(poll_interval, "battery poll interval in seconds - " \
157                "0 disables polling");
158
159/*
160 * Common code for BQ27x00 devices
161 */
162
163static inline int bq27x00_read(struct bq27x00_device_info *di, u8 reg,
164        bool single)
165{
166    if (di->chip == BQ27425)
167        return di->bus.read(di, reg - BQ27425_REG_OFFSET, single);
168    return di->bus.read(di, reg, single);
169}
170
171/*
172 * Higher versions of the chip like BQ27425 and BQ27500
173 * differ from BQ27000 and BQ27200 in calculation of certain
174 * parameters. Hence we need to check for the chip type.
175 */
176static bool bq27xxx_is_chip_version_higher(struct bq27x00_device_info *di)
177{
178    if (di->chip == BQ27425 || di->chip == BQ27500)
179        return true;
180    return false;
181}
182
183/*
184 * Return the battery Relative State-of-Charge
185 * Or < 0 if something fails.
186 */
187static int bq27x00_battery_read_rsoc(struct bq27x00_device_info *di)
188{
189    int rsoc;
190
191    if (di->chip == BQ27500)
192        rsoc = bq27x00_read(di, BQ27500_REG_SOC, false);
193    else if (di->chip == BQ27425)
194        rsoc = bq27x00_read(di, BQ27425_REG_SOC, false);
195    else
196        rsoc = bq27x00_read(di, BQ27000_REG_RSOC, true);
197
198    if (rsoc < 0)
199        dev_dbg(di->dev, "error reading relative State-of-Charge\n");
200
201    return rsoc;
202}
203
204/*
205 * Return a battery charge value in µAh
206 * Or < 0 if something fails.
207 */
208static int bq27x00_battery_read_charge(struct bq27x00_device_info *di, u8 reg)
209{
210    int charge;
211
212    charge = bq27x00_read(di, reg, false);
213    if (charge < 0) {
214        dev_dbg(di->dev, "error reading charge register %02x: %d\n",
215            reg, charge);
216        return charge;
217    }
218
219    if (bq27xxx_is_chip_version_higher(di))
220        charge *= 1000;
221    else
222        charge = charge * 3570 / BQ27000_RS;
223
224    return charge;
225}
226
227/*
228 * Return the battery Nominal available capaciy in µAh
229 * Or < 0 if something fails.
230 */
231static inline int bq27x00_battery_read_nac(struct bq27x00_device_info *di)
232{
233    return bq27x00_battery_read_charge(di, BQ27x00_REG_NAC);
234}
235
236/*
237 * Return the battery Last measured discharge in µAh
238 * Or < 0 if something fails.
239 */
240static inline int bq27x00_battery_read_lmd(struct bq27x00_device_info *di)
241{
242    return bq27x00_battery_read_charge(di, BQ27x00_REG_LMD);
243}
244
245/*
246 * Return the battery Initial last measured discharge in µAh
247 * Or < 0 if something fails.
248 */
249static int bq27x00_battery_read_ilmd(struct bq27x00_device_info *di)
250{
251    int ilmd;
252
253    if (bq27xxx_is_chip_version_higher(di))
254        ilmd = bq27x00_read(di, BQ27500_REG_DCAP, false);
255    else
256        ilmd = bq27x00_read(di, BQ27000_REG_ILMD, true);
257
258    if (ilmd < 0) {
259        dev_dbg(di->dev, "error reading initial last measured discharge\n");
260        return ilmd;
261    }
262
263    if (bq27xxx_is_chip_version_higher(di))
264        ilmd *= 1000;
265    else
266        ilmd = ilmd * 256 * 3570 / BQ27000_RS;
267
268    return ilmd;
269}
270
271/*
272 * Return the battery Available energy in µWh
273 * Or < 0 if something fails.
274 */
275static int bq27x00_battery_read_energy(struct bq27x00_device_info *di)
276{
277    int ae;
278
279    ae = bq27x00_read(di, BQ27x00_REG_AE, false);
280    if (ae < 0) {
281        dev_dbg(di->dev, "error reading available energy\n");
282        return ae;
283    }
284
285    if (di->chip == BQ27500)
286        ae *= 1000;
287    else
288        ae = ae * 29200 / BQ27000_RS;
289
290    return ae;
291}
292
293/*
294 * Return the battery temperature in tenths of degree Celsius
295 * Or < 0 if something fails.
296 */
297static int bq27x00_battery_read_temperature(struct bq27x00_device_info *di)
298{
299    int temp;
300
301    temp = bq27x00_read(di, BQ27x00_REG_TEMP, false);
302    if (temp < 0) {
303        dev_err(di->dev, "error reading temperature\n");
304        return temp;
305    }
306
307    if (bq27xxx_is_chip_version_higher(di))
308        temp -= 2731;
309    else
310        temp = ((temp * 5) - 5463) / 2;
311
312    return temp;
313}
314
315/*
316 * Return the battery Cycle count total
317 * Or < 0 if something fails.
318 */
319static int bq27x00_battery_read_cyct(struct bq27x00_device_info *di)
320{
321    int cyct;
322
323    cyct = bq27x00_read(di, BQ27x00_REG_CYCT, false);
324    if (cyct < 0)
325        dev_err(di->dev, "error reading cycle count total\n");
326
327    return cyct;
328}
329
330/*
331 * Read a time register.
332 * Return < 0 if something fails.
333 */
334static int bq27x00_battery_read_time(struct bq27x00_device_info *di, u8 reg)
335{
336    int tval;
337
338    tval = bq27x00_read(di, reg, false);
339    if (tval < 0) {
340        dev_dbg(di->dev, "error reading time register %02x: %d\n",
341            reg, tval);
342        return tval;
343    }
344
345    if (tval == 65535)
346        return -ENODATA;
347
348    return tval * 60;
349}
350
351/*
352 * Read a power avg register.
353 * Return < 0 if something fails.
354 */
355static int bq27x00_battery_read_pwr_avg(struct bq27x00_device_info *di, u8 reg)
356{
357    int tval;
358
359    tval = bq27x00_read(di, reg, false);
360    if (tval < 0) {
361        dev_err(di->dev, "error reading power avg rgister %02x: %d\n",
362            reg, tval);
363        return tval;
364    }
365
366    if (di->chip == BQ27500)
367        return tval;
368    else
369        return (tval * BQ27x00_POWER_CONSTANT) / BQ27000_RS;
370}
371
372/*
373 * Read flag register.
374 * Return < 0 if something fails.
375 */
376static int bq27x00_battery_read_health(struct bq27x00_device_info *di)
377{
378    int tval;
379
380    tval = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
381    if (tval < 0) {
382        dev_err(di->dev, "error reading flag register:%d\n", tval);
383        return tval;
384    }
385
386    if ((di->chip == BQ27500)) {
387        if (tval & BQ27500_FLAG_SOCF)
388            tval = POWER_SUPPLY_HEALTH_DEAD;
389        else if (tval & BQ27500_FLAG_OTC)
390            tval = POWER_SUPPLY_HEALTH_OVERHEAT;
391        else
392            tval = POWER_SUPPLY_HEALTH_GOOD;
393        return tval;
394    } else {
395        if (tval & BQ27000_FLAG_EDV1)
396            tval = POWER_SUPPLY_HEALTH_DEAD;
397        else
398            tval = POWER_SUPPLY_HEALTH_GOOD;
399        return tval;
400    }
401
402    return -1;
403}
404
405static void bq27x00_update(struct bq27x00_device_info *di)
406{
407    struct bq27x00_reg_cache cache = {0, };
408    bool is_bq27500 = di->chip == BQ27500;
409    bool is_bq27425 = di->chip == BQ27425;
410
411    cache.flags = bq27x00_read(di, BQ27x00_REG_FLAGS, !is_bq27500);
412    if (cache.flags >= 0) {
413        if (!is_bq27500 && !is_bq27425
414                && (cache.flags & BQ27000_FLAG_CI)) {
415            dev_info(di->dev, "battery is not calibrated! ignoring capacity values\n");
416            cache.capacity = -ENODATA;
417            cache.energy = -ENODATA;
418            cache.time_to_empty = -ENODATA;
419            cache.time_to_empty_avg = -ENODATA;
420            cache.time_to_full = -ENODATA;
421            cache.charge_full = -ENODATA;
422            cache.health = -ENODATA;
423        } else {
424            cache.capacity = bq27x00_battery_read_rsoc(di);
425            if (!is_bq27425) {
426                cache.energy = bq27x00_battery_read_energy(di);
427                cache.time_to_empty =
428                    bq27x00_battery_read_time(di,
429                            BQ27x00_REG_TTE);
430                cache.time_to_empty_avg =
431                    bq27x00_battery_read_time(di,
432                            BQ27x00_REG_TTECP);
433                cache.time_to_full =
434                    bq27x00_battery_read_time(di,
435                            BQ27x00_REG_TTF);
436            }
437            cache.charge_full = bq27x00_battery_read_lmd(di);
438            cache.health = bq27x00_battery_read_health(di);
439        }
440        cache.temperature = bq27x00_battery_read_temperature(di);
441        if (!is_bq27425)
442            cache.cycle_count = bq27x00_battery_read_cyct(di);
443        cache.cycle_count = bq27x00_battery_read_cyct(di);
444        cache.power_avg =
445            bq27x00_battery_read_pwr_avg(di, BQ27x00_POWER_AVG);
446
447        /* We only have to read charge design full once */
448        if (di->charge_design_full <= 0)
449            di->charge_design_full = bq27x00_battery_read_ilmd(di);
450    }
451
452    if (memcmp(&di->cache, &cache, sizeof(cache)) != 0) {
453        di->cache = cache;
454        power_supply_changed(&di->bat);
455    }
456
457    di->last_update = jiffies;
458}
459
460static void bq27x00_battery_poll(struct work_struct *work)
461{
462    struct bq27x00_device_info *di =
463        container_of(work, struct bq27x00_device_info, work.work);
464
465    bq27x00_update(di);
466
467    if (poll_interval > 0) {
468        /* The timer does not have to be accurate. */
469        set_timer_slack(&di->work.timer, poll_interval * HZ / 4);
470        schedule_delayed_work(&di->work, poll_interval * HZ);
471    }
472}
473
474/*
475 * Return the battery average current in µA
476 * Note that current can be negative signed as well
477 * Or 0 if something fails.
478 */
479static int bq27x00_battery_current(struct bq27x00_device_info *di,
480    union power_supply_propval *val)
481{
482    int curr;
483    int flags;
484
485    curr = bq27x00_read(di, BQ27x00_REG_AI, false);
486    if (curr < 0) {
487        dev_err(di->dev, "error reading current\n");
488        return curr;
489    }
490
491    if (bq27xxx_is_chip_version_higher(di)) {
492        /* bq27500 returns signed value */
493        val->intval = (int)((s16)curr) * 1000;
494    } else {
495        flags = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
496        if (flags & BQ27000_FLAG_CHGS) {
497            dev_dbg(di->dev, "negative current!\n");
498            curr = -curr;
499        }
500
501        val->intval = curr * 3570 / BQ27000_RS;
502    }
503
504    return 0;
505}
506
507static int bq27x00_battery_status(struct bq27x00_device_info *di,
508    union power_supply_propval *val)
509{
510    int status;
511
512    if (bq27xxx_is_chip_version_higher(di)) {
513        if (di->cache.flags & BQ27500_FLAG_FC)
514            status = POWER_SUPPLY_STATUS_FULL;
515        else if (di->cache.flags & BQ27500_FLAG_DSC)
516            status = POWER_SUPPLY_STATUS_DISCHARGING;
517        else
518            status = POWER_SUPPLY_STATUS_CHARGING;
519    } else {
520        if (di->cache.flags & BQ27000_FLAG_FC)
521            status = POWER_SUPPLY_STATUS_FULL;
522        else if (di->cache.flags & BQ27000_FLAG_CHGS)
523            status = POWER_SUPPLY_STATUS_CHARGING;
524        else if (power_supply_am_i_supplied(&di->bat))
525            status = POWER_SUPPLY_STATUS_NOT_CHARGING;
526        else
527            status = POWER_SUPPLY_STATUS_DISCHARGING;
528    }
529
530    val->intval = status;
531
532    return 0;
533}
534
535static int bq27x00_battery_capacity_level(struct bq27x00_device_info *di,
536    union power_supply_propval *val)
537{
538    int level;
539
540    if (bq27xxx_is_chip_version_higher(di)) {
541        if (di->cache.flags & BQ27500_FLAG_FC)
542            level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
543        else if (di->cache.flags & BQ27500_FLAG_SOC1)
544            level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
545        else if (di->cache.flags & BQ27500_FLAG_SOCF)
546            level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
547        else
548            level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
549    } else {
550        if (di->cache.flags & BQ27000_FLAG_FC)
551            level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
552        else if (di->cache.flags & BQ27000_FLAG_EDV1)
553            level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
554        else if (di->cache.flags & BQ27000_FLAG_EDVF)
555            level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
556        else
557            level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
558    }
559
560    val->intval = level;
561
562    return 0;
563}
564
565/*
566 * Return the battery Voltage in millivolts
567 * Or < 0 if something fails.
568 */
569static int bq27x00_battery_voltage(struct bq27x00_device_info *di,
570    union power_supply_propval *val)
571{
572    int volt;
573
574    volt = bq27x00_read(di, BQ27x00_REG_VOLT, false);
575    if (volt < 0) {
576        dev_err(di->dev, "error reading voltage\n");
577        return volt;
578    }
579
580    val->intval = volt * 1000;
581
582    return 0;
583}
584
585static int bq27x00_simple_value(int value,
586    union power_supply_propval *val)
587{
588    if (value < 0)
589        return value;
590
591    val->intval = value;
592
593    return 0;
594}
595
596#define to_bq27x00_device_info(x) container_of((x), \
597                struct bq27x00_device_info, bat);
598
599static int bq27x00_battery_get_property(struct power_supply *psy,
600                    enum power_supply_property psp,
601                    union power_supply_propval *val)
602{
603    int ret = 0;
604    struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
605
606    mutex_lock(&di->lock);
607    if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
608        cancel_delayed_work_sync(&di->work);
609        bq27x00_battery_poll(&di->work.work);
610    }
611    mutex_unlock(&di->lock);
612
613    if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
614        return -ENODEV;
615
616    switch (psp) {
617    case POWER_SUPPLY_PROP_STATUS:
618        ret = bq27x00_battery_status(di, val);
619        break;
620    case POWER_SUPPLY_PROP_VOLTAGE_NOW:
621        ret = bq27x00_battery_voltage(di, val);
622        break;
623    case POWER_SUPPLY_PROP_PRESENT:
624        val->intval = di->cache.flags < 0 ? 0 : 1;
625        break;
626    case POWER_SUPPLY_PROP_CURRENT_NOW:
627        ret = bq27x00_battery_current(di, val);
628        break;
629    case POWER_SUPPLY_PROP_CAPACITY:
630        ret = bq27x00_simple_value(di->cache.capacity, val);
631        break;
632    case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
633        ret = bq27x00_battery_capacity_level(di, val);
634        break;
635    case POWER_SUPPLY_PROP_TEMP:
636        ret = bq27x00_simple_value(di->cache.temperature, val);
637        break;
638    case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
639        ret = bq27x00_simple_value(di->cache.time_to_empty, val);
640        break;
641    case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
642        ret = bq27x00_simple_value(di->cache.time_to_empty_avg, val);
643        break;
644    case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
645        ret = bq27x00_simple_value(di->cache.time_to_full, val);
646        break;
647    case POWER_SUPPLY_PROP_TECHNOLOGY:
648        val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
649        break;
650    case POWER_SUPPLY_PROP_CHARGE_NOW:
651        ret = bq27x00_simple_value(bq27x00_battery_read_nac(di), val);
652        break;
653    case POWER_SUPPLY_PROP_CHARGE_FULL:
654        ret = bq27x00_simple_value(di->cache.charge_full, val);
655        break;
656    case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
657        ret = bq27x00_simple_value(di->charge_design_full, val);
658        break;
659    case POWER_SUPPLY_PROP_CYCLE_COUNT:
660        ret = bq27x00_simple_value(di->cache.cycle_count, val);
661        break;
662    case POWER_SUPPLY_PROP_ENERGY_NOW:
663        ret = bq27x00_simple_value(di->cache.energy, val);
664        break;
665    case POWER_SUPPLY_PROP_POWER_AVG:
666        ret = bq27x00_simple_value(di->cache.power_avg, val);
667        break;
668    case POWER_SUPPLY_PROP_HEALTH:
669        ret = bq27x00_simple_value(di->cache.health, val);
670        break;
671    default:
672        return -EINVAL;
673    }
674
675    return ret;
676}
677
678static void bq27x00_external_power_changed(struct power_supply *psy)
679{
680    struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
681
682    cancel_delayed_work_sync(&di->work);
683    schedule_delayed_work(&di->work, 0);
684}
685
686static int bq27x00_powersupply_init(struct bq27x00_device_info *di)
687{
688    int ret;
689
690    di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
691    di->chip = BQ27425;
692    if (di->chip == BQ27425) {
693        di->bat.properties = bq27425_battery_props;
694        di->bat.num_properties = ARRAY_SIZE(bq27425_battery_props);
695    } else {
696        di->bat.properties = bq27x00_battery_props;
697        di->bat.num_properties = ARRAY_SIZE(bq27x00_battery_props);
698    }
699    di->bat.get_property = bq27x00_battery_get_property;
700    di->bat.external_power_changed = bq27x00_external_power_changed;
701
702    INIT_DELAYED_WORK(&di->work, bq27x00_battery_poll);
703    mutex_init(&di->lock);
704
705    ret = power_supply_register(di->dev, &di->bat);
706    if (ret) {
707        dev_err(di->dev, "failed to register battery: %d\n", ret);
708        return ret;
709    }
710
711    dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
712
713    bq27x00_update(di);
714
715    return 0;
716}
717
718static void bq27x00_powersupply_unregister(struct bq27x00_device_info *di)
719{
720    /*
721     * power_supply_unregister call bq27x00_battery_get_property which
722     * call bq27x00_battery_poll.
723     * Make sure that bq27x00_battery_poll will not call
724     * schedule_delayed_work again after unregister (which cause OOPS).
725     */
726    poll_interval = 0;
727
728    cancel_delayed_work_sync(&di->work);
729
730    power_supply_unregister(&di->bat);
731
732    mutex_destroy(&di->lock);
733}
734
735
736/* i2c specific code */
737#ifdef CONFIG_BATTERY_BQ27X00_I2C
738
739/* If the system has several batteries we need a different name for each
740 * of them...
741 */
742static DEFINE_IDR(battery_id);
743static DEFINE_MUTEX(battery_mutex);
744
745static int bq27x00_read_i2c(struct bq27x00_device_info *di, u8 reg, bool single)
746{
747    struct i2c_client *client = to_i2c_client(di->dev);
748    struct i2c_msg msg[2];
749    unsigned char data[2];
750    int ret;
751
752    if (!client->adapter)
753        return -ENODEV;
754
755    msg[0].addr = client->addr;
756    msg[0].flags = 0;
757    msg[0].buf = &reg;
758    msg[0].len = sizeof(reg);
759    msg[1].addr = client->addr;
760    msg[1].flags = I2C_M_RD;
761    msg[1].buf = data;
762    if (single)
763        msg[1].len = 1;
764    else
765        msg[1].len = 2;
766
767    ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
768    if (ret < 0)
769        return ret;
770
771    if (!single)
772        ret = get_unaligned_le16(data);
773    else
774        ret = data[0];
775
776    return ret;
777}
778
779static int bq27x00_battery_probe(struct i2c_client *client,
780                 const struct i2c_device_id *id)
781{
782    char *name;
783    struct bq27x00_device_info *di;
784    int num;
785    int retval = 0;
786
787    /* Get new ID for the new battery device */
788    retval = idr_pre_get(&battery_id, GFP_KERNEL);
789    if (retval == 0)
790        return -ENOMEM;
791    mutex_lock(&battery_mutex);
792    retval = idr_get_new(&battery_id, client, &num);
793    mutex_unlock(&battery_mutex);
794    if (retval < 0)
795        return retval;
796
797    name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num);
798    if (!name) {
799        dev_err(&client->dev, "failed to allocate device name\n");
800        retval = -ENOMEM;
801        goto batt_failed_1;
802    }
803
804    di = kzalloc(sizeof(*di), GFP_KERNEL);
805    if (!di) {
806        dev_err(&client->dev, "failed to allocate device info data\n");
807        retval = -ENOMEM;
808        goto batt_failed_2;
809    }
810
811    di->id = num;
812    di->dev = &client->dev;
813    di->chip = id->driver_data;
814    di->bat.name = name;
815    di->bus.read = &bq27x00_read_i2c;
816
817    if (bq27x00_powersupply_init(di))
818        goto batt_failed_3;
819
820    i2c_set_clientdata(client, di);
821
822    return 0;
823
824batt_failed_3:
825    kfree(di);
826batt_failed_2:
827    kfree(name);
828batt_failed_1:
829    mutex_lock(&battery_mutex);
830    idr_remove(&battery_id, num);
831    mutex_unlock(&battery_mutex);
832
833    return retval;
834}
835
836static int bq27x00_battery_remove(struct i2c_client *client)
837{
838    struct bq27x00_device_info *di = i2c_get_clientdata(client);
839
840    bq27x00_powersupply_unregister(di);
841
842    kfree(di->bat.name);
843
844    mutex_lock(&battery_mutex);
845    idr_remove(&battery_id, di->id);
846    mutex_unlock(&battery_mutex);
847
848    kfree(di);
849
850    return 0;
851}
852
853static const struct i2c_device_id bq27x00_id[] = {
854    { "bq27200", BQ27000 }, /* bq27200 is same as bq27000, but with i2c */
855    { "bq27500", BQ27500 },
856    { "bq27425", BQ27425 },
857    {},
858};
859MODULE_DEVICE_TABLE(i2c, bq27x00_id);
860
861static struct i2c_driver bq27x00_battery_driver = {
862    .driver = {
863        .name = "bq27x00-battery",
864    },
865    .probe = bq27x00_battery_probe,
866    .remove = bq27x00_battery_remove,
867    .id_table = bq27x00_id,
868};
869
870static inline int bq27x00_battery_i2c_init(void)
871{
872    int ret = i2c_add_driver(&bq27x00_battery_driver);
873    if (ret)
874        printk(KERN_ERR "Unable to register BQ27x00 i2c driver\n");
875
876    return ret;
877}
878
879static inline void bq27x00_battery_i2c_exit(void)
880{
881    i2c_del_driver(&bq27x00_battery_driver);
882}
883
884#else
885
886static inline int bq27x00_battery_i2c_init(void) { return 0; }
887static inline void bq27x00_battery_i2c_exit(void) {};
888
889#endif
890
891/* platform specific code */
892#ifdef CONFIG_BATTERY_BQ27X00_PLATFORM
893
894static int bq27000_read_platform(struct bq27x00_device_info *di, u8 reg,
895            bool single)
896{
897    struct device *dev = di->dev;
898    struct bq27000_platform_data *pdata = dev->platform_data;
899    unsigned int timeout = 3;
900    int upper, lower;
901    int temp;
902
903    if (!single) {
904        /* Make sure the value has not changed in between reading the
905         * lower and the upper part */
906        upper = pdata->read(dev, reg + 1);
907        do {
908            temp = upper;
909            if (upper < 0)
910                return upper;
911
912            lower = pdata->read(dev, reg);
913            if (lower < 0)
914                return lower;
915
916            upper = pdata->read(dev, reg + 1);
917        } while (temp != upper && --timeout);
918
919        if (timeout == 0)
920            return -EIO;
921
922        return (upper << 8) | lower;
923    }
924
925    return pdata->read(dev, reg);
926}
927
928static int __devinit bq27000_battery_probe(struct platform_device *pdev)
929{
930    struct bq27x00_device_info *di;
931    struct bq27000_platform_data *pdata = pdev->dev.platform_data;
932    int ret;
933
934    if (!pdata) {
935        dev_err(&pdev->dev, "no platform_data supplied\n");
936        return -EINVAL;
937    }
938
939    if (!pdata->read) {
940        dev_err(&pdev->dev, "no hdq read callback supplied\n");
941        return -EINVAL;
942    }
943
944    di = kzalloc(sizeof(*di), GFP_KERNEL);
945    if (!di) {
946        dev_err(&pdev->dev, "failed to allocate device info data\n");
947        return -ENOMEM;
948    }
949
950    platform_set_drvdata(pdev, di);
951
952    di->dev = &pdev->dev;
953    di->chip = BQ27000;
954
955    di->bat.name = pdata->name ?: dev_name(&pdev->dev);
956    di->bus.read = &bq27000_read_platform;
957
958    ret = bq27x00_powersupply_init(di);
959    if (ret)
960        goto err_free;
961
962    return 0;
963
964err_free:
965    platform_set_drvdata(pdev, NULL);
966    kfree(di);
967
968    return ret;
969}
970
971static int __devexit bq27000_battery_remove(struct platform_device *pdev)
972{
973    struct bq27x00_device_info *di = platform_get_drvdata(pdev);
974
975    bq27x00_powersupply_unregister(di);
976
977    platform_set_drvdata(pdev, NULL);
978    kfree(di);
979
980    return 0;
981}
982
983static struct platform_driver bq27000_battery_driver = {
984    .probe = bq27000_battery_probe,
985    .remove = __devexit_p(bq27000_battery_remove),
986    .driver = {
987        .name = "bq27000-battery",
988        .owner = THIS_MODULE,
989    },
990};
991
992static inline int bq27x00_battery_platform_init(void)
993{
994    int ret = platform_driver_register(&bq27000_battery_driver);
995    if (ret)
996        printk(KERN_ERR "Unable to register BQ27000 platform driver\n");
997
998    return ret;
999}
1000
1001static inline void bq27x00_battery_platform_exit(void)
1002{
1003    platform_driver_unregister(&bq27000_battery_driver);
1004}
1005
1006#else
1007
1008static inline int bq27x00_battery_platform_init(void) { return 0; }
1009static inline void bq27x00_battery_platform_exit(void) {};
1010
1011#endif
1012
1013/*
1014 * Module stuff
1015 */
1016
1017static int __init bq27x00_battery_init(void)
1018{
1019    int ret;
1020
1021    ret = bq27x00_battery_i2c_init();
1022    if (ret)
1023        return ret;
1024
1025    ret = bq27x00_battery_platform_init();
1026    if (ret)
1027        bq27x00_battery_i2c_exit();
1028
1029    return ret;
1030}
1031module_init(bq27x00_battery_init);
1032
1033static void __exit bq27x00_battery_exit(void)
1034{
1035    bq27x00_battery_platform_exit();
1036    bq27x00_battery_i2c_exit();
1037}
1038module_exit(bq27x00_battery_exit);
1039
1040MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
1041MODULE_DESCRIPTION("BQ27x00 battery monitor driver");
1042MODULE_LICENSE("GPL");
1043

Archive Download this file

Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master

Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9



interactive