2 * Copyright (C) ST-Ericsson SA 2012
4 * Battery temperature driver for AB8500
6 * License Terms: GNU General Public License v2
8 * Johan Palsson <johan.palsson@stericsson.com>
9 * Karl Komierowski <karl.komierowski@stericsson.com>
10 * Arun R Murthy <arun.murthy@stericsson.com>
13 #include <linux/init.h>
14 #include <linux/module.h>
15 #include <linux/device.h>
16 #include <linux/interrupt.h>
17 #include <linux/delay.h>
18 #include <linux/slab.h>
19 #include <linux/platform_device.h>
20 #include <linux/power_supply.h>
21 #include <linux/completion.h>
22 #include <linux/workqueue.h>
23 #include <linux/jiffies.h>
25 #include <linux/mfd/core.h>
26 #include <linux/mfd/abx500.h>
27 #include <linux/mfd/abx500/ab8500.h>
28 #include <linux/mfd/abx500/ab8500-bm.h>
29 #include <linux/mfd/abx500/ab8500-gpadc.h>
33 #define BTEMP_THERMAL_LOW_LIMIT -10
34 #define BTEMP_THERMAL_MED_LIMIT 0
35 #define BTEMP_THERMAL_HIGH_LIMIT_52 52
36 #define BTEMP_THERMAL_HIGH_LIMIT_57 57
37 #define BTEMP_THERMAL_HIGH_LIMIT_62 62
39 #define BTEMP_BATCTRL_CURR_SRC_7UA 7
40 #define BTEMP_BATCTRL_CURR_SRC_20UA 20
42 #define to_ab8500_btemp_device_info(x) container_of((x), \
43 struct ab8500_btemp, btemp_psy);
46 * struct ab8500_btemp_interrupts - ab8500 interrupts
47 * @name: name of the interrupt
48 * @isr function pointer to the isr
50 struct ab8500_btemp_interrupts
{
52 irqreturn_t (*isr
)(int irq
, void *data
);
55 struct ab8500_btemp_events
{
65 struct ab8500_btemp_ranges
{
72 * struct ab8500_btemp - ab8500 BTEMP device information
73 * @dev: Pointer to the structure device
74 * @node: List of AB8500 BTEMPs, hence prepared for reentrance
75 * @curr_source: What current source we use, in uA
76 * @bat_temp: Battery temperature in degree Celcius
77 * @prev_bat_temp Last dispatched battery temperature
78 * @parent: Pointer to the struct ab8500
79 * @gpadc: Pointer to the struct gpadc
80 * @fg: Pointer to the struct fg
81 * @bm: Platform specific battery management information
82 * @btemp_psy: Structure for BTEMP specific battery properties
83 * @events: Structure for information about events triggered
84 * @btemp_ranges: Battery temperature range structure
85 * @btemp_wq: Work queue for measuring the temperature periodically
86 * @btemp_periodic_work: Work for measuring the temperature periodically
87 * @initialized: True if battery id read.
91 struct list_head node
;
95 struct ab8500
*parent
;
96 struct ab8500_gpadc
*gpadc
;
98 struct abx500_bm_data
*bm
;
99 struct power_supply btemp_psy
;
100 struct ab8500_btemp_events events
;
101 struct ab8500_btemp_ranges btemp_ranges
;
102 struct workqueue_struct
*btemp_wq
;
103 struct delayed_work btemp_periodic_work
;
107 /* BTEMP power supply properties */
108 static enum power_supply_property ab8500_btemp_props
[] = {
109 POWER_SUPPLY_PROP_PRESENT
,
110 POWER_SUPPLY_PROP_ONLINE
,
111 POWER_SUPPLY_PROP_TECHNOLOGY
,
112 POWER_SUPPLY_PROP_TEMP
,
115 static LIST_HEAD(ab8500_btemp_list
);
118 * ab8500_btemp_get() - returns a reference to the primary AB8500 BTEMP
119 * (i.e. the first BTEMP in the instance list)
121 struct ab8500_btemp
*ab8500_btemp_get(void)
123 struct ab8500_btemp
*btemp
;
124 btemp
= list_first_entry(&ab8500_btemp_list
, struct ab8500_btemp
, node
);
130 * ab8500_btemp_batctrl_volt_to_res() - convert batctrl voltage to resistance
131 * @di: pointer to the ab8500_btemp structure
132 * @v_batctrl: measured batctrl voltage
133 * @inst_curr: measured instant current
135 * This function returns the battery resistance that is
136 * derived from the BATCTRL voltage.
137 * Returns value in Ohms.
139 static int ab8500_btemp_batctrl_volt_to_res(struct ab8500_btemp
*di
,
140 int v_batctrl
, int inst_curr
)
144 if (is_ab8500_1p1_or_earlier(di
->parent
)) {
146 * For ABB cut1.0 and 1.1 BAT_CTRL is internally
147 * connected to 1.8V through a 450k resistor
149 return (450000 * (v_batctrl
)) / (1800 - v_batctrl
);
152 if (di
->bm
->adc_therm
== ABx500_ADC_THERM_BATCTRL
) {
154 * If the battery has internal NTC, we use the current
155 * source to calculate the resistance, 7uA or 20uA
157 rbs
= (v_batctrl
* 1000
158 - di
->bm
->gnd_lift_resistance
* inst_curr
)
162 * BAT_CTRL is internally
163 * connected to 1.8V through a 80k resistor
165 rbs
= (80000 * (v_batctrl
)) / (1800 - v_batctrl
);
172 * ab8500_btemp_read_batctrl_voltage() - measure batctrl voltage
173 * @di: pointer to the ab8500_btemp structure
175 * This function returns the voltage on BATCTRL. Returns value in mV.
177 static int ab8500_btemp_read_batctrl_voltage(struct ab8500_btemp
*di
)
182 vbtemp
= ab8500_gpadc_convert(di
->gpadc
, BAT_CTRL
);
185 "%s gpadc conversion failed, using previous value",
194 * ab8500_btemp_curr_source_enable() - enable/disable batctrl current source
195 * @di: pointer to the ab8500_btemp structure
196 * @enable: enable or disable the current source
198 * Enable or disable the current sources for the BatCtrl AD channel
200 static int ab8500_btemp_curr_source_enable(struct ab8500_btemp
*di
,
207 * BATCTRL current sources are included on AB8500 cut2.0
208 * and future versions
210 if (is_ab8500_1p1_or_earlier(di
->parent
))
213 /* Only do this for batteries with internal NTC */
214 if (di
->bm
->adc_therm
== ABx500_ADC_THERM_BATCTRL
&& enable
) {
215 if (di
->curr_source
== BTEMP_BATCTRL_CURR_SRC_7UA
)
216 curr
= BAT_CTRL_7U_ENA
;
218 curr
= BAT_CTRL_20U_ENA
;
220 dev_dbg(di
->dev
, "Set BATCTRL %duA\n", di
->curr_source
);
222 ret
= abx500_mask_and_set_register_interruptible(di
->dev
,
223 AB8500_CHARGER
, AB8500_BAT_CTRL_CURRENT_SOURCE
,
224 FORCE_BAT_CTRL_CMP_HIGH
, FORCE_BAT_CTRL_CMP_HIGH
);
226 dev_err(di
->dev
, "%s failed setting cmp_force\n",
232 * We have to wait one 32kHz cycle before enabling
233 * the current source, since ForceBatCtrlCmpHigh needs
234 * to be written in a separate cycle
238 ret
= abx500_set_register_interruptible(di
->dev
,
239 AB8500_CHARGER
, AB8500_BAT_CTRL_CURRENT_SOURCE
,
240 FORCE_BAT_CTRL_CMP_HIGH
| curr
);
242 dev_err(di
->dev
, "%s failed enabling current source\n",
244 goto disable_curr_source
;
246 } else if (di
->bm
->adc_therm
== ABx500_ADC_THERM_BATCTRL
&& !enable
) {
247 dev_dbg(di
->dev
, "Disable BATCTRL curr source\n");
249 /* Write 0 to the curr bits */
250 ret
= abx500_mask_and_set_register_interruptible(di
->dev
,
251 AB8500_CHARGER
, AB8500_BAT_CTRL_CURRENT_SOURCE
,
252 BAT_CTRL_7U_ENA
| BAT_CTRL_20U_ENA
,
253 ~(BAT_CTRL_7U_ENA
| BAT_CTRL_20U_ENA
));
255 dev_err(di
->dev
, "%s failed disabling current source\n",
257 goto disable_curr_source
;
260 /* Enable Pull-Up and comparator */
261 ret
= abx500_mask_and_set_register_interruptible(di
->dev
,
262 AB8500_CHARGER
, AB8500_BAT_CTRL_CURRENT_SOURCE
,
263 BAT_CTRL_PULL_UP_ENA
| BAT_CTRL_CMP_ENA
,
264 BAT_CTRL_PULL_UP_ENA
| BAT_CTRL_CMP_ENA
);
266 dev_err(di
->dev
, "%s failed enabling PU and comp\n",
272 * We have to wait one 32kHz cycle before disabling
273 * ForceBatCtrlCmpHigh since this needs to be written
274 * in a separate cycle
278 /* Disable 'force comparator' */
279 ret
= abx500_mask_and_set_register_interruptible(di
->dev
,
280 AB8500_CHARGER
, AB8500_BAT_CTRL_CURRENT_SOURCE
,
281 FORCE_BAT_CTRL_CMP_HIGH
, ~FORCE_BAT_CTRL_CMP_HIGH
);
283 dev_err(di
->dev
, "%s failed disabling force comp\n",
285 goto disable_force_comp
;
291 * We have to try unsetting FORCE_BAT_CTRL_CMP_HIGH one more time
292 * if we got an error above
295 /* Write 0 to the curr bits */
296 ret
= abx500_mask_and_set_register_interruptible(di
->dev
,
297 AB8500_CHARGER
, AB8500_BAT_CTRL_CURRENT_SOURCE
,
298 BAT_CTRL_7U_ENA
| BAT_CTRL_20U_ENA
,
299 ~(BAT_CTRL_7U_ENA
| BAT_CTRL_20U_ENA
));
301 dev_err(di
->dev
, "%s failed disabling current source\n",
306 /* Enable Pull-Up and comparator */
307 ret
= abx500_mask_and_set_register_interruptible(di
->dev
,
308 AB8500_CHARGER
, AB8500_BAT_CTRL_CURRENT_SOURCE
,
309 BAT_CTRL_PULL_UP_ENA
| BAT_CTRL_CMP_ENA
,
310 BAT_CTRL_PULL_UP_ENA
| BAT_CTRL_CMP_ENA
);
312 dev_err(di
->dev
, "%s failed enabling PU and comp\n",
319 * We have to wait one 32kHz cycle before disabling
320 * ForceBatCtrlCmpHigh since this needs to be written
321 * in a separate cycle
325 /* Disable 'force comparator' */
326 ret
= abx500_mask_and_set_register_interruptible(di
->dev
,
327 AB8500_CHARGER
, AB8500_BAT_CTRL_CURRENT_SOURCE
,
328 FORCE_BAT_CTRL_CMP_HIGH
, ~FORCE_BAT_CTRL_CMP_HIGH
);
330 dev_err(di
->dev
, "%s failed disabling force comp\n",
339 * ab8500_btemp_get_batctrl_res() - get battery resistance
340 * @di: pointer to the ab8500_btemp structure
342 * This function returns the battery pack identification resistance.
343 * Returns value in Ohms.
345 static int ab8500_btemp_get_batctrl_res(struct ab8500_btemp
*di
)
354 * BATCTRL current sources are included on AB8500 cut2.0
355 * and future versions
357 ret
= ab8500_btemp_curr_source_enable(di
, true);
359 dev_err(di
->dev
, "%s curr source enabled failed\n", __func__
);
364 di
->fg
= ab8500_fg_get();
366 dev_err(di
->dev
, "No fg found\n");
370 ret
= ab8500_fg_inst_curr_start(di
->fg
);
373 dev_err(di
->dev
, "Failed to start current measurement\n");
378 * Since there is no interrupt when current measurement is done,
379 * loop for over 250ms (250ms is one sample conversion time
380 * with 32.768 Khz RTC clock). Note that a stop time must be set
381 * since the ab8500_btemp_read_batctrl_voltage call can block and
382 * take an unknown amount of time to complete.
387 batctrl
+= ab8500_btemp_read_batctrl_voltage(di
);
390 } while (!ab8500_fg_inst_curr_done(di
->fg
));
393 ret
= ab8500_fg_inst_curr_finalize(di
->fg
, &inst_curr
);
395 dev_err(di
->dev
, "Failed to finalize current measurement\n");
399 res
= ab8500_btemp_batctrl_volt_to_res(di
, batctrl
, inst_curr
);
401 ret
= ab8500_btemp_curr_source_enable(di
, false);
403 dev_err(di
->dev
, "%s curr source disable failed\n", __func__
);
407 dev_dbg(di
->dev
, "%s batctrl: %d res: %d inst_curr: %d samples: %d\n",
408 __func__
, batctrl
, res
, inst_curr
, i
);
414 * ab8500_btemp_res_to_temp() - resistance to temperature
415 * @di: pointer to the ab8500_btemp structure
416 * @tbl: pointer to the resiatance to temperature table
417 * @tbl_size: size of the resistance to temperature table
418 * @res: resistance to calculate the temperature from
420 * This function returns the battery temperature in degrees Celcius
421 * based on the NTC resistance.
423 static int ab8500_btemp_res_to_temp(struct ab8500_btemp
*di
,
424 const struct abx500_res_to_temp
*tbl
, int tbl_size
, int res
)
428 * Calculate the formula for the straight line
429 * Simple interpolation if we are within
430 * the resistance table limits, extrapolate
431 * if resistance is outside the limits.
433 if (res
> tbl
[0].resist
)
435 else if (res
<= tbl
[tbl_size
- 1].resist
)
439 while (!(res
<= tbl
[i
].resist
&&
440 res
> tbl
[i
+ 1].resist
))
444 temp
= tbl
[i
].temp
+ ((tbl
[i
+ 1].temp
- tbl
[i
].temp
) *
445 (res
- tbl
[i
].resist
)) / (tbl
[i
+ 1].resist
- tbl
[i
].resist
);
450 * ab8500_btemp_measure_temp() - measure battery temperature
451 * @di: pointer to the ab8500_btemp structure
453 * Returns battery temperature (on success) else the previous temperature
455 static int ab8500_btemp_measure_temp(struct ab8500_btemp
*di
)
459 int rbat
, rntc
, vntc
;
462 id
= di
->bm
->batt_id
;
464 if (di
->bm
->adc_therm
== ABx500_ADC_THERM_BATCTRL
&&
465 id
!= BATTERY_UNKNOWN
) {
467 rbat
= ab8500_btemp_get_batctrl_res(di
);
469 dev_err(di
->dev
, "%s get batctrl res failed\n",
472 * Return out-of-range temperature so that
473 * charging is stopped
475 return BTEMP_THERMAL_LOW_LIMIT
;
478 temp
= ab8500_btemp_res_to_temp(di
,
479 di
->bm
->bat_type
[id
].r_to_t_tbl
,
480 di
->bm
->bat_type
[id
].n_temp_tbl_elements
, rbat
);
482 vntc
= ab8500_gpadc_convert(di
->gpadc
, BTEMP_BALL
);
485 "%s gpadc conversion failed,"
486 " using previous value\n", __func__
);
490 * The PCB NTC is sourced from VTVOUT via a 230kOhm
493 rntc
= 230000 * vntc
/ (VTVOUT_V
- vntc
);
495 temp
= ab8500_btemp_res_to_temp(di
,
496 di
->bm
->bat_type
[id
].r_to_t_tbl
,
497 di
->bm
->bat_type
[id
].n_temp_tbl_elements
, rntc
);
500 dev_dbg(di
->dev
, "Battery temperature is %d\n", temp
);
505 * ab8500_btemp_id() - Identify the connected battery
506 * @di: pointer to the ab8500_btemp structure
508 * This function will try to identify the battery by reading the ID
509 * resistor. Some brands use a combined ID resistor with a NTC resistor to
510 * both be able to identify and to read the temperature of it.
512 static int ab8500_btemp_id(struct ab8500_btemp
*di
)
517 di
->curr_source
= BTEMP_BATCTRL_CURR_SRC_7UA
;
518 di
->bm
->batt_id
= BATTERY_UNKNOWN
;
520 res
= ab8500_btemp_get_batctrl_res(di
);
522 dev_err(di
->dev
, "%s get batctrl res failed\n", __func__
);
526 /* BATTERY_UNKNOWN is defined on position 0, skip it! */
527 for (i
= BATTERY_UNKNOWN
+ 1; i
< di
->bm
->n_btypes
; i
++) {
528 if ((res
<= di
->bm
->bat_type
[i
].resis_high
) &&
529 (res
>= di
->bm
->bat_type
[i
].resis_low
)) {
530 dev_dbg(di
->dev
, "Battery detected on %s"
531 " low %d < res %d < high: %d"
533 di
->bm
->adc_therm
== ABx500_ADC_THERM_BATCTRL
?
534 "BATCTRL" : "BATTEMP",
535 di
->bm
->bat_type
[i
].resis_low
, res
,
536 di
->bm
->bat_type
[i
].resis_high
, i
);
543 if (di
->bm
->batt_id
== BATTERY_UNKNOWN
) {
544 dev_warn(di
->dev
, "Battery identified as unknown"
545 ", resistance %d Ohm\n", res
);
550 * We only have to change current source if the
551 * detected type is Type 1, else we use the 7uA source
553 if (di
->bm
->adc_therm
== ABx500_ADC_THERM_BATCTRL
&&
554 di
->bm
->batt_id
== 1) {
555 dev_dbg(di
->dev
, "Set BATCTRL current source to 20uA\n");
556 di
->curr_source
= BTEMP_BATCTRL_CURR_SRC_20UA
;
559 return di
->bm
->batt_id
;
563 * ab8500_btemp_periodic_work() - Measuring the temperature periodically
564 * @work: pointer to the work_struct structure
566 * Work function for measuring the temperature periodically
568 static void ab8500_btemp_periodic_work(struct work_struct
*work
)
571 struct ab8500_btemp
*di
= container_of(work
,
572 struct ab8500_btemp
, btemp_periodic_work
.work
);
574 if (!di
->initialized
) {
575 di
->initialized
= true;
576 /* Identify the battery */
577 if (ab8500_btemp_id(di
) < 0)
578 dev_warn(di
->dev
, "failed to identify the battery\n");
581 di
->bat_temp
= ab8500_btemp_measure_temp(di
);
583 if (di
->bat_temp
!= di
->prev_bat_temp
) {
584 di
->prev_bat_temp
= di
->bat_temp
;
585 power_supply_changed(&di
->btemp_psy
);
588 if (di
->events
.ac_conn
|| di
->events
.usb_conn
)
589 interval
= di
->bm
->temp_interval_chg
;
591 interval
= di
->bm
->temp_interval_nochg
;
593 /* Schedule a new measurement */
594 queue_delayed_work(di
->btemp_wq
,
595 &di
->btemp_periodic_work
,
596 round_jiffies(interval
* HZ
));
600 * ab8500_btemp_batctrlindb_handler() - battery removal detected
601 * @irq: interrupt number
602 * @_di: void pointer that has to address of ab8500_btemp
604 * Returns IRQ status(IRQ_HANDLED)
606 static irqreturn_t
ab8500_btemp_batctrlindb_handler(int irq
, void *_di
)
608 struct ab8500_btemp
*di
= _di
;
609 dev_err(di
->dev
, "Battery removal detected!\n");
611 di
->events
.batt_rem
= true;
612 power_supply_changed(&di
->btemp_psy
);
618 * ab8500_btemp_templow_handler() - battery temp lower than 10 degrees
619 * @irq: interrupt number
620 * @_di: void pointer that has to address of ab8500_btemp
622 * Returns IRQ status(IRQ_HANDLED)
624 static irqreturn_t
ab8500_btemp_templow_handler(int irq
, void *_di
)
626 struct ab8500_btemp
*di
= _di
;
628 if (is_ab8500_2p0_or_earlier(di
->parent
)) {
629 dev_dbg(di
->dev
, "Ignore false btemp low irq"
630 " for ABB cut 1.0, 1.1 and 2.0\n");
632 dev_crit(di
->dev
, "Battery temperature lower than -10deg c\n");
634 di
->events
.btemp_low
= true;
635 di
->events
.btemp_high
= false;
636 di
->events
.btemp_medhigh
= false;
637 di
->events
.btemp_lowmed
= false;
638 power_supply_changed(&di
->btemp_psy
);
645 * ab8500_btemp_temphigh_handler() - battery temp higher than max temp
646 * @irq: interrupt number
647 * @_di: void pointer that has to address of ab8500_btemp
649 * Returns IRQ status(IRQ_HANDLED)
651 static irqreturn_t
ab8500_btemp_temphigh_handler(int irq
, void *_di
)
653 struct ab8500_btemp
*di
= _di
;
655 dev_crit(di
->dev
, "Battery temperature is higher than MAX temp\n");
657 di
->events
.btemp_high
= true;
658 di
->events
.btemp_medhigh
= false;
659 di
->events
.btemp_lowmed
= false;
660 di
->events
.btemp_low
= false;
661 power_supply_changed(&di
->btemp_psy
);
667 * ab8500_btemp_lowmed_handler() - battery temp between low and medium
668 * @irq: interrupt number
669 * @_di: void pointer that has to address of ab8500_btemp
671 * Returns IRQ status(IRQ_HANDLED)
673 static irqreturn_t
ab8500_btemp_lowmed_handler(int irq
, void *_di
)
675 struct ab8500_btemp
*di
= _di
;
677 dev_dbg(di
->dev
, "Battery temperature is between low and medium\n");
679 di
->events
.btemp_lowmed
= true;
680 di
->events
.btemp_medhigh
= false;
681 di
->events
.btemp_high
= false;
682 di
->events
.btemp_low
= false;
683 power_supply_changed(&di
->btemp_psy
);
689 * ab8500_btemp_medhigh_handler() - battery temp between medium and high
690 * @irq: interrupt number
691 * @_di: void pointer that has to address of ab8500_btemp
693 * Returns IRQ status(IRQ_HANDLED)
695 static irqreturn_t
ab8500_btemp_medhigh_handler(int irq
, void *_di
)
697 struct ab8500_btemp
*di
= _di
;
699 dev_dbg(di
->dev
, "Battery temperature is between medium and high\n");
701 di
->events
.btemp_medhigh
= true;
702 di
->events
.btemp_lowmed
= false;
703 di
->events
.btemp_high
= false;
704 di
->events
.btemp_low
= false;
705 power_supply_changed(&di
->btemp_psy
);
711 * ab8500_btemp_periodic() - Periodic temperature measurements
712 * @di: pointer to the ab8500_btemp structure
713 * @enable: enable or disable periodic temperature measurements
715 * Starts of stops periodic temperature measurements. Periodic measurements
716 * should only be done when a charger is connected.
718 static void ab8500_btemp_periodic(struct ab8500_btemp
*di
,
721 dev_dbg(di
->dev
, "Enable periodic temperature measurements: %d\n",
724 * Make sure a new measurement is done directly by cancelling
727 cancel_delayed_work_sync(&di
->btemp_periodic_work
);
730 queue_delayed_work(di
->btemp_wq
, &di
->btemp_periodic_work
, 0);
734 * ab8500_btemp_get_temp() - get battery temperature
735 * @di: pointer to the ab8500_btemp structure
737 * Returns battery temperature
739 static int ab8500_btemp_get_temp(struct ab8500_btemp
*di
)
744 * The BTEMP events are not reliabe on AB8500 cut2.0
747 if (is_ab8500_2p0_or_earlier(di
->parent
)) {
748 temp
= di
->bat_temp
* 10;
750 if (di
->events
.btemp_low
) {
751 if (temp
> di
->btemp_ranges
.btemp_low_limit
)
752 temp
= di
->btemp_ranges
.btemp_low_limit
;
754 temp
= di
->bat_temp
* 10;
755 } else if (di
->events
.btemp_high
) {
756 if (temp
< di
->btemp_ranges
.btemp_high_limit
)
757 temp
= di
->btemp_ranges
.btemp_high_limit
;
759 temp
= di
->bat_temp
* 10;
760 } else if (di
->events
.btemp_lowmed
) {
761 if (temp
> di
->btemp_ranges
.btemp_med_limit
)
762 temp
= di
->btemp_ranges
.btemp_med_limit
;
764 temp
= di
->bat_temp
* 10;
765 } else if (di
->events
.btemp_medhigh
) {
766 if (temp
< di
->btemp_ranges
.btemp_med_limit
)
767 temp
= di
->btemp_ranges
.btemp_med_limit
;
769 temp
= di
->bat_temp
* 10;
771 temp
= di
->bat_temp
* 10;
777 * ab8500_btemp_get_batctrl_temp() - get the temperature
778 * @btemp: pointer to the btemp structure
780 * Returns the batctrl temperature in millidegrees
782 int ab8500_btemp_get_batctrl_temp(struct ab8500_btemp
*btemp
)
784 return btemp
->bat_temp
* 1000;
788 * ab8500_btemp_get_property() - get the btemp properties
789 * @psy: pointer to the power_supply structure
790 * @psp: pointer to the power_supply_property structure
791 * @val: pointer to the power_supply_propval union
793 * This function gets called when an application tries to get the btemp
794 * properties by reading the sysfs files.
795 * online: presence of the battery
796 * present: presence of the battery
797 * technology: battery technology
798 * temp: battery temperature
799 * Returns error code in case of failure else 0(on success)
801 static int ab8500_btemp_get_property(struct power_supply
*psy
,
802 enum power_supply_property psp
,
803 union power_supply_propval
*val
)
805 struct ab8500_btemp
*di
;
807 di
= to_ab8500_btemp_device_info(psy
);
810 case POWER_SUPPLY_PROP_PRESENT
:
811 case POWER_SUPPLY_PROP_ONLINE
:
812 if (di
->events
.batt_rem
)
817 case POWER_SUPPLY_PROP_TECHNOLOGY
:
818 val
->intval
= di
->bm
->bat_type
[di
->bm
->batt_id
].name
;
820 case POWER_SUPPLY_PROP_TEMP
:
821 val
->intval
= ab8500_btemp_get_temp(di
);
829 static int ab8500_btemp_get_ext_psy_data(struct device
*dev
, void *data
)
831 struct power_supply
*psy
;
832 struct power_supply
*ext
;
833 struct ab8500_btemp
*di
;
834 union power_supply_propval ret
;
836 bool psy_found
= false;
838 psy
= (struct power_supply
*)data
;
839 ext
= dev_get_drvdata(dev
);
840 di
= to_ab8500_btemp_device_info(psy
);
843 * For all psy where the name of your driver
844 * appears in any supplied_to
846 for (i
= 0; i
< ext
->num_supplicants
; i
++) {
847 if (!strcmp(ext
->supplied_to
[i
], psy
->name
))
854 /* Go through all properties for the psy */
855 for (j
= 0; j
< ext
->num_properties
; j
++) {
856 enum power_supply_property prop
;
857 prop
= ext
->properties
[j
];
859 if (ext
->get_property(ext
, prop
, &ret
))
863 case POWER_SUPPLY_PROP_PRESENT
:
865 case POWER_SUPPLY_TYPE_MAINS
:
866 /* AC disconnected */
867 if (!ret
.intval
&& di
->events
.ac_conn
) {
868 di
->events
.ac_conn
= false;
871 else if (ret
.intval
&& !di
->events
.ac_conn
) {
872 di
->events
.ac_conn
= true;
873 if (!di
->events
.usb_conn
)
874 ab8500_btemp_periodic(di
, true);
877 case POWER_SUPPLY_TYPE_USB
:
878 /* USB disconnected */
879 if (!ret
.intval
&& di
->events
.usb_conn
) {
880 di
->events
.usb_conn
= false;
883 else if (ret
.intval
&& !di
->events
.usb_conn
) {
884 di
->events
.usb_conn
= true;
885 if (!di
->events
.ac_conn
)
886 ab8500_btemp_periodic(di
, true);
901 * ab8500_btemp_external_power_changed() - callback for power supply changes
902 * @psy: pointer to the structure power_supply
904 * This function is pointing to the function pointer external_power_changed
905 * of the structure power_supply.
906 * This function gets executed when there is a change in the external power
907 * supply to the btemp.
909 static void ab8500_btemp_external_power_changed(struct power_supply
*psy
)
911 struct ab8500_btemp
*di
= to_ab8500_btemp_device_info(psy
);
913 class_for_each_device(power_supply_class
, NULL
,
914 &di
->btemp_psy
, ab8500_btemp_get_ext_psy_data
);
917 /* ab8500 btemp driver interrupts and their respective isr */
918 static struct ab8500_btemp_interrupts ab8500_btemp_irq
[] = {
919 {"BAT_CTRL_INDB", ab8500_btemp_batctrlindb_handler
},
920 {"BTEMP_LOW", ab8500_btemp_templow_handler
},
921 {"BTEMP_HIGH", ab8500_btemp_temphigh_handler
},
922 {"BTEMP_LOW_MEDIUM", ab8500_btemp_lowmed_handler
},
923 {"BTEMP_MEDIUM_HIGH", ab8500_btemp_medhigh_handler
},
926 #if defined(CONFIG_PM)
927 static int ab8500_btemp_resume(struct platform_device
*pdev
)
929 struct ab8500_btemp
*di
= platform_get_drvdata(pdev
);
931 ab8500_btemp_periodic(di
, true);
936 static int ab8500_btemp_suspend(struct platform_device
*pdev
,
939 struct ab8500_btemp
*di
= platform_get_drvdata(pdev
);
941 ab8500_btemp_periodic(di
, false);
946 #define ab8500_btemp_suspend NULL
947 #define ab8500_btemp_resume NULL
950 static int __devexit
ab8500_btemp_remove(struct platform_device
*pdev
)
952 struct ab8500_btemp
*di
= platform_get_drvdata(pdev
);
955 /* Disable interrupts */
956 for (i
= 0; i
< ARRAY_SIZE(ab8500_btemp_irq
); i
++) {
957 irq
= platform_get_irq_byname(pdev
, ab8500_btemp_irq
[i
].name
);
961 /* Delete the work queue */
962 destroy_workqueue(di
->btemp_wq
);
964 flush_scheduled_work();
965 power_supply_unregister(&di
->btemp_psy
);
966 platform_set_drvdata(pdev
, NULL
);
971 static char *supply_interface
[] = {
976 static int __devinit
ab8500_btemp_probe(struct platform_device
*pdev
)
978 struct device_node
*np
= pdev
->dev
.of_node
;
979 struct abx500_bm_data
*plat
= pdev
->dev
.platform_data
;
980 struct ab8500_btemp
*di
;
984 di
= devm_kzalloc(&pdev
->dev
, sizeof(*di
), GFP_KERNEL
);
986 dev_err(&pdev
->dev
, "%s no mem for ab8500_btemp\n", __func__
);
991 dev_err(&pdev
->dev
, "no battery management data supplied\n");
997 ret
= ab8500_bm_of_probe(&pdev
->dev
, np
, di
->bm
);
999 dev_err(&pdev
->dev
, "failed to get battery information\n");
1004 /* get parent data */
1005 di
->dev
= &pdev
->dev
;
1006 di
->parent
= dev_get_drvdata(pdev
->dev
.parent
);
1007 di
->gpadc
= ab8500_gpadc_get("ab8500-gpadc.0");
1009 di
->initialized
= false;
1012 di
->btemp_psy
.name
= "ab8500_btemp";
1013 di
->btemp_psy
.type
= POWER_SUPPLY_TYPE_BATTERY
;
1014 di
->btemp_psy
.properties
= ab8500_btemp_props
;
1015 di
->btemp_psy
.num_properties
= ARRAY_SIZE(ab8500_btemp_props
);
1016 di
->btemp_psy
.get_property
= ab8500_btemp_get_property
;
1017 di
->btemp_psy
.supplied_to
= supply_interface
;
1018 di
->btemp_psy
.num_supplicants
= ARRAY_SIZE(supply_interface
);
1019 di
->btemp_psy
.external_power_changed
=
1020 ab8500_btemp_external_power_changed
;
1023 /* Create a work queue for the btemp */
1025 create_singlethread_workqueue("ab8500_btemp_wq");
1026 if (di
->btemp_wq
== NULL
) {
1027 dev_err(di
->dev
, "failed to create work queue\n");
1031 /* Init work for measuring temperature periodically */
1032 INIT_DEFERRABLE_WORK(&di
->btemp_periodic_work
,
1033 ab8500_btemp_periodic_work
);
1035 /* Set BTEMP thermal limits. Low and Med are fixed */
1036 di
->btemp_ranges
.btemp_low_limit
= BTEMP_THERMAL_LOW_LIMIT
;
1037 di
->btemp_ranges
.btemp_med_limit
= BTEMP_THERMAL_MED_LIMIT
;
1039 ret
= abx500_get_register_interruptible(di
->dev
, AB8500_CHARGER
,
1040 AB8500_BTEMP_HIGH_TH
, &val
);
1042 dev_err(di
->dev
, "%s ab8500 read failed\n", __func__
);
1046 case BTEMP_HIGH_TH_57_0
:
1047 case BTEMP_HIGH_TH_57_1
:
1048 di
->btemp_ranges
.btemp_high_limit
=
1049 BTEMP_THERMAL_HIGH_LIMIT_57
;
1051 case BTEMP_HIGH_TH_52
:
1052 di
->btemp_ranges
.btemp_high_limit
=
1053 BTEMP_THERMAL_HIGH_LIMIT_52
;
1055 case BTEMP_HIGH_TH_62
:
1056 di
->btemp_ranges
.btemp_high_limit
=
1057 BTEMP_THERMAL_HIGH_LIMIT_62
;
1061 /* Register BTEMP power supply class */
1062 ret
= power_supply_register(di
->dev
, &di
->btemp_psy
);
1064 dev_err(di
->dev
, "failed to register BTEMP psy\n");
1068 /* Register interrupts */
1069 for (i
= 0; i
< ARRAY_SIZE(ab8500_btemp_irq
); i
++) {
1070 irq
= platform_get_irq_byname(pdev
, ab8500_btemp_irq
[i
].name
);
1071 ret
= request_threaded_irq(irq
, NULL
, ab8500_btemp_irq
[i
].isr
,
1072 IRQF_SHARED
| IRQF_NO_SUSPEND
,
1073 ab8500_btemp_irq
[i
].name
, di
);
1076 dev_err(di
->dev
, "failed to request %s IRQ %d: %d\n"
1077 , ab8500_btemp_irq
[i
].name
, irq
, ret
);
1080 dev_dbg(di
->dev
, "Requested %s IRQ %d: %d\n",
1081 ab8500_btemp_irq
[i
].name
, irq
, ret
);
1084 platform_set_drvdata(pdev
, di
);
1086 /* Kick off periodic temperature measurements */
1087 ab8500_btemp_periodic(di
, true);
1088 list_add_tail(&di
->node
, &ab8500_btemp_list
);
1093 power_supply_unregister(&di
->btemp_psy
);
1095 /* We also have to free all successfully registered irqs */
1096 for (i
= i
- 1; i
>= 0; i
--) {
1097 irq
= platform_get_irq_byname(pdev
, ab8500_btemp_irq
[i
].name
);
1101 destroy_workqueue(di
->btemp_wq
);
1105 static const struct of_device_id ab8500_btemp_match
[] = {
1106 { .compatible
= "stericsson,ab8500-btemp", },
1110 static struct platform_driver ab8500_btemp_driver
= {
1111 .probe
= ab8500_btemp_probe
,
1112 .remove
= __devexit_p(ab8500_btemp_remove
),
1113 .suspend
= ab8500_btemp_suspend
,
1114 .resume
= ab8500_btemp_resume
,
1116 .name
= "ab8500-btemp",
1117 .owner
= THIS_MODULE
,
1118 .of_match_table
= ab8500_btemp_match
,
1122 static int __init
ab8500_btemp_init(void)
1124 return platform_driver_register(&ab8500_btemp_driver
);
1127 static void __exit
ab8500_btemp_exit(void)
1129 platform_driver_unregister(&ab8500_btemp_driver
);
1132 subsys_initcall_sync(ab8500_btemp_init
);
1133 module_exit(ab8500_btemp_exit
);
1135 MODULE_LICENSE("GPL v2");
1136 MODULE_AUTHOR("Johan Palsson, Karl Komierowski, Arun R Murthy");
1137 MODULE_ALIAS("platform:ab8500-btemp");
1138 MODULE_DESCRIPTION("AB8500 battery temperature driver");