1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Copyright (C) ST-Ericsson SA 2012 |
4 | * |
5 | * Battery temperature driver for AB8500 |
6 | * |
7 | * Author: |
8 | * Johan Palsson <johan.palsson@stericsson.com> |
9 | * Karl Komierowski <karl.komierowski@stericsson.com> |
10 | * Arun R Murthy <arun.murthy@stericsson.com> |
11 | */ |
12 | |
13 | #include <linux/init.h> |
14 | #include <linux/module.h> |
15 | #include <linux/device.h> |
16 | #include <linux/component.h> |
17 | #include <linux/interrupt.h> |
18 | #include <linux/delay.h> |
19 | #include <linux/slab.h> |
20 | #include <linux/platform_device.h> |
21 | #include <linux/power_supply.h> |
22 | #include <linux/completion.h> |
23 | #include <linux/workqueue.h> |
24 | #include <linux/jiffies.h> |
25 | #include <linux/of.h> |
26 | #include <linux/mfd/core.h> |
27 | #include <linux/mfd/abx500.h> |
28 | #include <linux/mfd/abx500/ab8500.h> |
29 | #include <linux/thermal.h> |
30 | #include <linux/iio/consumer.h> |
31 | #include <linux/fixp-arith.h> |
32 | |
33 | #include "ab8500-bm.h" |
34 | |
35 | #define BTEMP_THERMAL_LOW_LIMIT -10 |
36 | #define BTEMP_THERMAL_MED_LIMIT 0 |
37 | #define BTEMP_THERMAL_HIGH_LIMIT_52 52 |
38 | #define BTEMP_THERMAL_HIGH_LIMIT_57 57 |
39 | #define BTEMP_THERMAL_HIGH_LIMIT_62 62 |
40 | |
41 | #define BTEMP_BATCTRL_CURR_SRC_7UA 7 |
42 | #define BTEMP_BATCTRL_CURR_SRC_20UA 20 |
43 | |
44 | #define BTEMP_BATCTRL_CURR_SRC_16UA 16 |
45 | #define BTEMP_BATCTRL_CURR_SRC_18UA 18 |
46 | |
47 | #define BTEMP_BATCTRL_CURR_SRC_60UA 60 |
48 | #define BTEMP_BATCTRL_CURR_SRC_120UA 120 |
49 | |
50 | /** |
51 | * struct ab8500_btemp_interrupts - ab8500 interrupts |
52 | * @name: name of the interrupt |
53 | * @isr function pointer to the isr |
54 | */ |
55 | struct ab8500_btemp_interrupts { |
56 | char *name; |
57 | irqreturn_t (*isr)(int irq, void *data); |
58 | }; |
59 | |
60 | struct ab8500_btemp_events { |
61 | bool batt_rem; |
62 | bool btemp_high; |
63 | bool btemp_medhigh; |
64 | bool btemp_lowmed; |
65 | bool btemp_low; |
66 | bool ac_conn; |
67 | bool usb_conn; |
68 | }; |
69 | |
70 | struct ab8500_btemp_ranges { |
71 | int btemp_high_limit; |
72 | int btemp_med_limit; |
73 | int btemp_low_limit; |
74 | }; |
75 | |
76 | /** |
77 | * struct ab8500_btemp - ab8500 BTEMP device information |
78 | * @dev: Pointer to the structure device |
79 | * @node: List of AB8500 BTEMPs, hence prepared for reentrance |
80 | * @curr_source: What current source we use, in uA |
81 | * @bat_temp: Dispatched battery temperature in degree Celsius |
82 | * @prev_bat_temp Last measured battery temperature in degree Celsius |
83 | * @parent: Pointer to the struct ab8500 |
84 | * @tz: Thermal zone for the battery |
85 | * @adc_bat_ctrl: ADC channel for the battery control |
86 | * @fg: Pointer to the struct fg |
87 | * @bm: Platform specific battery management information |
88 | * @btemp_psy: Structure for BTEMP specific battery properties |
89 | * @events: Structure for information about events triggered |
90 | * @btemp_ranges: Battery temperature range structure |
91 | * @btemp_wq: Work queue for measuring the temperature periodically |
92 | * @btemp_periodic_work: Work for measuring the temperature periodically |
93 | * @initialized: True if battery id read. |
94 | */ |
95 | struct ab8500_btemp { |
96 | struct device *dev; |
97 | struct list_head node; |
98 | int curr_source; |
99 | int bat_temp; |
100 | int prev_bat_temp; |
101 | struct ab8500 *parent; |
102 | struct thermal_zone_device *tz; |
103 | struct iio_channel *bat_ctrl; |
104 | struct ab8500_fg *fg; |
105 | struct ab8500_bm_data *bm; |
106 | struct power_supply *btemp_psy; |
107 | struct ab8500_btemp_events events; |
108 | struct ab8500_btemp_ranges btemp_ranges; |
109 | struct workqueue_struct *btemp_wq; |
110 | struct delayed_work btemp_periodic_work; |
111 | bool initialized; |
112 | }; |
113 | |
114 | /* BTEMP power supply properties */ |
115 | static enum power_supply_property ab8500_btemp_props[] = { |
116 | POWER_SUPPLY_PROP_PRESENT, |
117 | POWER_SUPPLY_PROP_ONLINE, |
118 | POWER_SUPPLY_PROP_TEMP, |
119 | }; |
120 | |
121 | static LIST_HEAD(ab8500_btemp_list); |
122 | |
123 | /** |
124 | * ab8500_btemp_batctrl_volt_to_res() - convert batctrl voltage to resistance |
125 | * @di: pointer to the ab8500_btemp structure |
126 | * @v_batctrl: measured batctrl voltage |
127 | * @inst_curr: measured instant current |
128 | * |
129 | * This function returns the battery resistance that is |
130 | * derived from the BATCTRL voltage. |
131 | * Returns value in Ohms. |
132 | */ |
133 | static int ab8500_btemp_batctrl_volt_to_res(struct ab8500_btemp *di, |
134 | int v_batctrl, int inst_curr) |
135 | { |
136 | if (is_ab8500_1p1_or_earlier(ab: di->parent)) { |
137 | /* |
138 | * For ABB cut1.0 and 1.1 BAT_CTRL is internally |
139 | * connected to 1.8V through a 450k resistor |
140 | */ |
141 | return (450000 * (v_batctrl)) / (1800 - v_batctrl); |
142 | } |
143 | |
144 | /* |
145 | * BAT_CTRL is internally |
146 | * connected to 1.8V through a 80k resistor |
147 | */ |
148 | return (80000 * (v_batctrl)) / (1800 - v_batctrl); |
149 | } |
150 | |
151 | /** |
152 | * ab8500_btemp_read_batctrl_voltage() - measure batctrl voltage |
153 | * @di: pointer to the ab8500_btemp structure |
154 | * |
155 | * This function returns the voltage on BATCTRL. Returns value in mV. |
156 | */ |
157 | static int ab8500_btemp_read_batctrl_voltage(struct ab8500_btemp *di) |
158 | { |
159 | int vbtemp, ret; |
160 | static int prev; |
161 | |
162 | ret = iio_read_channel_processed(chan: di->bat_ctrl, val: &vbtemp); |
163 | if (ret < 0) { |
164 | dev_err(di->dev, |
165 | "%s ADC conversion failed, using previous value" , |
166 | __func__); |
167 | return prev; |
168 | } |
169 | prev = vbtemp; |
170 | return vbtemp; |
171 | } |
172 | |
173 | /** |
174 | * ab8500_btemp_get_batctrl_res() - get battery resistance |
175 | * @di: pointer to the ab8500_btemp structure |
176 | * |
177 | * This function returns the battery pack identification resistance. |
178 | * Returns value in Ohms. |
179 | */ |
180 | static int ab8500_btemp_get_batctrl_res(struct ab8500_btemp *di) |
181 | { |
182 | int ret; |
183 | int batctrl = 0; |
184 | int res; |
185 | int inst_curr; |
186 | int i; |
187 | |
188 | if (!di->fg) |
189 | di->fg = ab8500_fg_get(); |
190 | if (!di->fg) { |
191 | dev_err(di->dev, "No fg found\n" ); |
192 | return -EINVAL; |
193 | } |
194 | |
195 | ret = ab8500_fg_inst_curr_start(di: di->fg); |
196 | |
197 | if (ret) { |
198 | dev_err(di->dev, "Failed to start current measurement\n" ); |
199 | return ret; |
200 | } |
201 | |
202 | do { |
203 | msleep(msecs: 20); |
204 | } while (!ab8500_fg_inst_curr_started(di: di->fg)); |
205 | |
206 | i = 0; |
207 | |
208 | do { |
209 | batctrl += ab8500_btemp_read_batctrl_voltage(di); |
210 | i++; |
211 | msleep(msecs: 20); |
212 | } while (!ab8500_fg_inst_curr_done(di: di->fg)); |
213 | batctrl /= i; |
214 | |
215 | ret = ab8500_fg_inst_curr_finalize(di: di->fg, res: &inst_curr); |
216 | if (ret) { |
217 | dev_err(di->dev, "Failed to finalize current measurement\n" ); |
218 | return ret; |
219 | } |
220 | |
221 | res = ab8500_btemp_batctrl_volt_to_res(di, v_batctrl: batctrl, inst_curr); |
222 | |
223 | dev_dbg(di->dev, "%s batctrl: %d res: %d inst_curr: %d samples: %d\n" , |
224 | __func__, batctrl, res, inst_curr, i); |
225 | |
226 | return res; |
227 | } |
228 | |
229 | /** |
230 | * ab8500_btemp_id() - Identify the connected battery |
231 | * @di: pointer to the ab8500_btemp structure |
232 | * |
233 | * This function will try to identify the battery by reading the ID |
234 | * resistor. Some brands use a combined ID resistor with a NTC resistor to |
235 | * both be able to identify and to read the temperature of it. |
236 | */ |
237 | static int ab8500_btemp_id(struct ab8500_btemp *di) |
238 | { |
239 | struct power_supply_battery_info *bi = di->bm->bi; |
240 | int res; |
241 | |
242 | di->curr_source = BTEMP_BATCTRL_CURR_SRC_7UA; |
243 | |
244 | res = ab8500_btemp_get_batctrl_res(di); |
245 | if (res < 0) { |
246 | dev_err(di->dev, "%s get batctrl res failed\n" , __func__); |
247 | return -ENXIO; |
248 | } |
249 | |
250 | if (power_supply_battery_bti_in_range(info: bi, resistance: res)) { |
251 | dev_info(di->dev, "Battery detected on BATCTRL (pin C3)" |
252 | " resistance %d Ohm = %d Ohm +/- %d%%\n" , |
253 | res, bi->bti_resistance_ohm, |
254 | bi->bti_resistance_tolerance); |
255 | } else { |
256 | dev_warn(di->dev, "Battery identified as unknown" |
257 | ", resistance %d Ohm\n" , res); |
258 | return -ENXIO; |
259 | } |
260 | |
261 | return 0; |
262 | } |
263 | |
264 | /** |
265 | * ab8500_btemp_periodic_work() - Measuring the temperature periodically |
266 | * @work: pointer to the work_struct structure |
267 | * |
268 | * Work function for measuring the temperature periodically |
269 | */ |
270 | static void ab8500_btemp_periodic_work(struct work_struct *work) |
271 | { |
272 | int interval; |
273 | int bat_temp; |
274 | struct ab8500_btemp *di = container_of(work, |
275 | struct ab8500_btemp, btemp_periodic_work.work); |
276 | /* Assume 25 degrees celsius as start temperature */ |
277 | static int prev = 25; |
278 | int ret; |
279 | |
280 | if (!di->initialized) { |
281 | /* Identify the battery */ |
282 | if (ab8500_btemp_id(di) < 0) |
283 | dev_warn(di->dev, "failed to identify the battery\n" ); |
284 | } |
285 | |
286 | /* Failover if a reading is erroneous, use last meausurement */ |
287 | ret = thermal_zone_get_temp(tz: di->tz, temp: &bat_temp); |
288 | if (ret) { |
289 | dev_err(di->dev, "error reading temperature\n" ); |
290 | bat_temp = prev; |
291 | } else { |
292 | /* Convert from millicentigrades to centigrades */ |
293 | bat_temp /= 1000; |
294 | prev = bat_temp; |
295 | } |
296 | |
297 | /* |
298 | * Filter battery temperature. |
299 | * Allow direct updates on temperature only if two samples result in |
300 | * same temperature. Else only allow 1 degree change from previous |
301 | * reported value in the direction of the new measurement. |
302 | */ |
303 | if ((bat_temp == di->prev_bat_temp) || !di->initialized) { |
304 | if ((di->bat_temp != di->prev_bat_temp) || !di->initialized) { |
305 | di->initialized = true; |
306 | di->bat_temp = bat_temp; |
307 | power_supply_changed(psy: di->btemp_psy); |
308 | } |
309 | } else if (bat_temp < di->prev_bat_temp) { |
310 | di->bat_temp--; |
311 | power_supply_changed(psy: di->btemp_psy); |
312 | } else if (bat_temp > di->prev_bat_temp) { |
313 | di->bat_temp++; |
314 | power_supply_changed(psy: di->btemp_psy); |
315 | } |
316 | di->prev_bat_temp = bat_temp; |
317 | |
318 | if (di->events.ac_conn || di->events.usb_conn) |
319 | interval = di->bm->temp_interval_chg; |
320 | else |
321 | interval = di->bm->temp_interval_nochg; |
322 | |
323 | /* Schedule a new measurement */ |
324 | queue_delayed_work(wq: di->btemp_wq, |
325 | dwork: &di->btemp_periodic_work, |
326 | delay: round_jiffies(j: interval * HZ)); |
327 | } |
328 | |
329 | /** |
330 | * ab8500_btemp_batctrlindb_handler() - battery removal detected |
331 | * @irq: interrupt number |
332 | * @_di: void pointer that has to address of ab8500_btemp |
333 | * |
334 | * Returns IRQ status(IRQ_HANDLED) |
335 | */ |
336 | static irqreturn_t ab8500_btemp_batctrlindb_handler(int irq, void *_di) |
337 | { |
338 | struct ab8500_btemp *di = _di; |
339 | dev_err(di->dev, "Battery removal detected!\n" ); |
340 | |
341 | di->events.batt_rem = true; |
342 | power_supply_changed(psy: di->btemp_psy); |
343 | |
344 | return IRQ_HANDLED; |
345 | } |
346 | |
347 | /** |
348 | * ab8500_btemp_templow_handler() - battery temp lower than 10 degrees |
349 | * @irq: interrupt number |
350 | * @_di: void pointer that has to address of ab8500_btemp |
351 | * |
352 | * Returns IRQ status(IRQ_HANDLED) |
353 | */ |
354 | static irqreturn_t ab8500_btemp_templow_handler(int irq, void *_di) |
355 | { |
356 | struct ab8500_btemp *di = _di; |
357 | |
358 | if (is_ab8500_3p3_or_earlier(ab: di->parent)) { |
359 | dev_dbg(di->dev, "Ignore false btemp low irq" |
360 | " for ABB cut 1.0, 1.1, 2.0 and 3.3\n" ); |
361 | } else { |
362 | dev_crit(di->dev, "Battery temperature lower than -10deg c\n" ); |
363 | |
364 | di->events.btemp_low = true; |
365 | di->events.btemp_high = false; |
366 | di->events.btemp_medhigh = false; |
367 | di->events.btemp_lowmed = false; |
368 | power_supply_changed(psy: di->btemp_psy); |
369 | } |
370 | |
371 | return IRQ_HANDLED; |
372 | } |
373 | |
374 | /** |
375 | * ab8500_btemp_temphigh_handler() - battery temp higher than max temp |
376 | * @irq: interrupt number |
377 | * @_di: void pointer that has to address of ab8500_btemp |
378 | * |
379 | * Returns IRQ status(IRQ_HANDLED) |
380 | */ |
381 | static irqreturn_t ab8500_btemp_temphigh_handler(int irq, void *_di) |
382 | { |
383 | struct ab8500_btemp *di = _di; |
384 | |
385 | dev_crit(di->dev, "Battery temperature is higher than MAX temp\n" ); |
386 | |
387 | di->events.btemp_high = true; |
388 | di->events.btemp_medhigh = false; |
389 | di->events.btemp_lowmed = false; |
390 | di->events.btemp_low = false; |
391 | power_supply_changed(psy: di->btemp_psy); |
392 | |
393 | return IRQ_HANDLED; |
394 | } |
395 | |
396 | /** |
397 | * ab8500_btemp_lowmed_handler() - battery temp between low and medium |
398 | * @irq: interrupt number |
399 | * @_di: void pointer that has to address of ab8500_btemp |
400 | * |
401 | * Returns IRQ status(IRQ_HANDLED) |
402 | */ |
403 | static irqreturn_t ab8500_btemp_lowmed_handler(int irq, void *_di) |
404 | { |
405 | struct ab8500_btemp *di = _di; |
406 | |
407 | dev_dbg(di->dev, "Battery temperature is between low and medium\n" ); |
408 | |
409 | di->events.btemp_lowmed = true; |
410 | di->events.btemp_medhigh = false; |
411 | di->events.btemp_high = false; |
412 | di->events.btemp_low = false; |
413 | power_supply_changed(psy: di->btemp_psy); |
414 | |
415 | return IRQ_HANDLED; |
416 | } |
417 | |
418 | /** |
419 | * ab8500_btemp_medhigh_handler() - battery temp between medium and high |
420 | * @irq: interrupt number |
421 | * @_di: void pointer that has to address of ab8500_btemp |
422 | * |
423 | * Returns IRQ status(IRQ_HANDLED) |
424 | */ |
425 | static irqreturn_t ab8500_btemp_medhigh_handler(int irq, void *_di) |
426 | { |
427 | struct ab8500_btemp *di = _di; |
428 | |
429 | dev_dbg(di->dev, "Battery temperature is between medium and high\n" ); |
430 | |
431 | di->events.btemp_medhigh = true; |
432 | di->events.btemp_lowmed = false; |
433 | di->events.btemp_high = false; |
434 | di->events.btemp_low = false; |
435 | power_supply_changed(psy: di->btemp_psy); |
436 | |
437 | return IRQ_HANDLED; |
438 | } |
439 | |
440 | /** |
441 | * ab8500_btemp_periodic() - Periodic temperature measurements |
442 | * @di: pointer to the ab8500_btemp structure |
443 | * @enable: enable or disable periodic temperature measurements |
444 | * |
445 | * Starts of stops periodic temperature measurements. Periodic measurements |
446 | * should only be done when a charger is connected. |
447 | */ |
448 | static void ab8500_btemp_periodic(struct ab8500_btemp *di, |
449 | bool enable) |
450 | { |
451 | dev_dbg(di->dev, "Enable periodic temperature measurements: %d\n" , |
452 | enable); |
453 | /* |
454 | * Make sure a new measurement is done directly by cancelling |
455 | * any pending work |
456 | */ |
457 | cancel_delayed_work_sync(dwork: &di->btemp_periodic_work); |
458 | |
459 | if (enable) |
460 | queue_delayed_work(wq: di->btemp_wq, dwork: &di->btemp_periodic_work, delay: 0); |
461 | } |
462 | |
463 | /** |
464 | * ab8500_btemp_get_temp() - get battery temperature |
465 | * @di: pointer to the ab8500_btemp structure |
466 | * |
467 | * Returns battery temperature |
468 | */ |
469 | static int ab8500_btemp_get_temp(struct ab8500_btemp *di) |
470 | { |
471 | int temp = 0; |
472 | |
473 | /* |
474 | * The BTEMP events are not reliabe on AB8500 cut3.3 |
475 | * and prior versions |
476 | */ |
477 | if (is_ab8500_3p3_or_earlier(ab: di->parent)) { |
478 | temp = di->bat_temp * 10; |
479 | } else { |
480 | if (di->events.btemp_low) { |
481 | if (temp > di->btemp_ranges.btemp_low_limit) |
482 | temp = di->btemp_ranges.btemp_low_limit * 10; |
483 | else |
484 | temp = di->bat_temp * 10; |
485 | } else if (di->events.btemp_high) { |
486 | if (temp < di->btemp_ranges.btemp_high_limit) |
487 | temp = di->btemp_ranges.btemp_high_limit * 10; |
488 | else |
489 | temp = di->bat_temp * 10; |
490 | } else if (di->events.btemp_lowmed) { |
491 | if (temp > di->btemp_ranges.btemp_med_limit) |
492 | temp = di->btemp_ranges.btemp_med_limit * 10; |
493 | else |
494 | temp = di->bat_temp * 10; |
495 | } else if (di->events.btemp_medhigh) { |
496 | if (temp < di->btemp_ranges.btemp_med_limit) |
497 | temp = di->btemp_ranges.btemp_med_limit * 10; |
498 | else |
499 | temp = di->bat_temp * 10; |
500 | } else |
501 | temp = di->bat_temp * 10; |
502 | } |
503 | return temp; |
504 | } |
505 | |
506 | /** |
507 | * ab8500_btemp_get_property() - get the btemp properties |
508 | * @psy: pointer to the power_supply structure |
509 | * @psp: pointer to the power_supply_property structure |
510 | * @val: pointer to the power_supply_propval union |
511 | * |
512 | * This function gets called when an application tries to get the btemp |
513 | * properties by reading the sysfs files. |
514 | * online: presence of the battery |
515 | * present: presence of the battery |
516 | * technology: battery technology |
517 | * temp: battery temperature |
518 | * Returns error code in case of failure else 0(on success) |
519 | */ |
520 | static int ab8500_btemp_get_property(struct power_supply *psy, |
521 | enum power_supply_property psp, |
522 | union power_supply_propval *val) |
523 | { |
524 | struct ab8500_btemp *di = power_supply_get_drvdata(psy); |
525 | |
526 | switch (psp) { |
527 | case POWER_SUPPLY_PROP_PRESENT: |
528 | case POWER_SUPPLY_PROP_ONLINE: |
529 | if (di->events.batt_rem) |
530 | val->intval = 0; |
531 | else |
532 | val->intval = 1; |
533 | break; |
534 | case POWER_SUPPLY_PROP_TEMP: |
535 | val->intval = ab8500_btemp_get_temp(di); |
536 | break; |
537 | default: |
538 | return -EINVAL; |
539 | } |
540 | return 0; |
541 | } |
542 | |
543 | static int ab8500_btemp_get_ext_psy_data(struct device *dev, void *data) |
544 | { |
545 | struct power_supply *psy; |
546 | struct power_supply *ext = dev_get_drvdata(dev); |
547 | const char **supplicants = (const char **)ext->supplied_to; |
548 | struct ab8500_btemp *di; |
549 | union power_supply_propval ret; |
550 | int j; |
551 | |
552 | psy = (struct power_supply *)data; |
553 | di = power_supply_get_drvdata(psy); |
554 | |
555 | /* |
556 | * For all psy where the name of your driver |
557 | * appears in any supplied_to |
558 | */ |
559 | j = match_string(array: supplicants, n: ext->num_supplicants, string: psy->desc->name); |
560 | if (j < 0) |
561 | return 0; |
562 | |
563 | /* Go through all properties for the psy */ |
564 | for (j = 0; j < ext->desc->num_properties; j++) { |
565 | enum power_supply_property prop; |
566 | prop = ext->desc->properties[j]; |
567 | |
568 | if (power_supply_get_property(psy: ext, psp: prop, val: &ret)) |
569 | continue; |
570 | |
571 | switch (prop) { |
572 | case POWER_SUPPLY_PROP_PRESENT: |
573 | switch (ext->desc->type) { |
574 | case POWER_SUPPLY_TYPE_MAINS: |
575 | /* AC disconnected */ |
576 | if (!ret.intval && di->events.ac_conn) { |
577 | di->events.ac_conn = false; |
578 | } |
579 | /* AC connected */ |
580 | else if (ret.intval && !di->events.ac_conn) { |
581 | di->events.ac_conn = true; |
582 | if (!di->events.usb_conn) |
583 | ab8500_btemp_periodic(di, enable: true); |
584 | } |
585 | break; |
586 | case POWER_SUPPLY_TYPE_USB: |
587 | /* USB disconnected */ |
588 | if (!ret.intval && di->events.usb_conn) { |
589 | di->events.usb_conn = false; |
590 | } |
591 | /* USB connected */ |
592 | else if (ret.intval && !di->events.usb_conn) { |
593 | di->events.usb_conn = true; |
594 | if (!di->events.ac_conn) |
595 | ab8500_btemp_periodic(di, enable: true); |
596 | } |
597 | break; |
598 | default: |
599 | break; |
600 | } |
601 | break; |
602 | default: |
603 | break; |
604 | } |
605 | } |
606 | return 0; |
607 | } |
608 | |
609 | /** |
610 | * ab8500_btemp_external_power_changed() - callback for power supply changes |
611 | * @psy: pointer to the structure power_supply |
612 | * |
613 | * This function is pointing to the function pointer external_power_changed |
614 | * of the structure power_supply. |
615 | * This function gets executed when there is a change in the external power |
616 | * supply to the btemp. |
617 | */ |
618 | static void ab8500_btemp_external_power_changed(struct power_supply *psy) |
619 | { |
620 | class_for_each_device(class: power_supply_class, NULL, data: psy, |
621 | fn: ab8500_btemp_get_ext_psy_data); |
622 | } |
623 | |
624 | /* ab8500 btemp driver interrupts and their respective isr */ |
625 | static struct ab8500_btemp_interrupts ab8500_btemp_irq[] = { |
626 | {"BAT_CTRL_INDB" , ab8500_btemp_batctrlindb_handler}, |
627 | {"BTEMP_LOW" , ab8500_btemp_templow_handler}, |
628 | {"BTEMP_HIGH" , ab8500_btemp_temphigh_handler}, |
629 | {"BTEMP_LOW_MEDIUM" , ab8500_btemp_lowmed_handler}, |
630 | {"BTEMP_MEDIUM_HIGH" , ab8500_btemp_medhigh_handler}, |
631 | }; |
632 | |
633 | static int __maybe_unused ab8500_btemp_resume(struct device *dev) |
634 | { |
635 | struct ab8500_btemp *di = dev_get_drvdata(dev); |
636 | |
637 | ab8500_btemp_periodic(di, enable: true); |
638 | |
639 | return 0; |
640 | } |
641 | |
642 | static int __maybe_unused ab8500_btemp_suspend(struct device *dev) |
643 | { |
644 | struct ab8500_btemp *di = dev_get_drvdata(dev); |
645 | |
646 | ab8500_btemp_periodic(di, enable: false); |
647 | |
648 | return 0; |
649 | } |
650 | |
651 | static char *supply_interface[] = { |
652 | "ab8500_chargalg" , |
653 | "ab8500_fg" , |
654 | }; |
655 | |
656 | static const struct power_supply_desc ab8500_btemp_desc = { |
657 | .name = "ab8500_btemp" , |
658 | .type = POWER_SUPPLY_TYPE_UNKNOWN, |
659 | .properties = ab8500_btemp_props, |
660 | .num_properties = ARRAY_SIZE(ab8500_btemp_props), |
661 | .get_property = ab8500_btemp_get_property, |
662 | .external_power_changed = ab8500_btemp_external_power_changed, |
663 | }; |
664 | |
665 | static int ab8500_btemp_bind(struct device *dev, struct device *master, |
666 | void *data) |
667 | { |
668 | struct ab8500_btemp *di = dev_get_drvdata(dev); |
669 | |
670 | /* Create a work queue for the btemp */ |
671 | di->btemp_wq = |
672 | alloc_workqueue(fmt: "ab8500_btemp_wq" , flags: WQ_MEM_RECLAIM, max_active: 0); |
673 | if (di->btemp_wq == NULL) { |
674 | dev_err(dev, "failed to create work queue\n" ); |
675 | return -ENOMEM; |
676 | } |
677 | |
678 | /* Kick off periodic temperature measurements */ |
679 | ab8500_btemp_periodic(di, enable: true); |
680 | |
681 | return 0; |
682 | } |
683 | |
684 | static void ab8500_btemp_unbind(struct device *dev, struct device *master, |
685 | void *data) |
686 | { |
687 | struct ab8500_btemp *di = dev_get_drvdata(dev); |
688 | |
689 | /* Delete the work queue */ |
690 | destroy_workqueue(wq: di->btemp_wq); |
691 | } |
692 | |
693 | static const struct component_ops ab8500_btemp_component_ops = { |
694 | .bind = ab8500_btemp_bind, |
695 | .unbind = ab8500_btemp_unbind, |
696 | }; |
697 | |
698 | static int ab8500_btemp_probe(struct platform_device *pdev) |
699 | { |
700 | struct power_supply_config psy_cfg = {}; |
701 | struct device *dev = &pdev->dev; |
702 | struct ab8500_btemp *di; |
703 | int irq, i, ret = 0; |
704 | u8 val; |
705 | |
706 | di = devm_kzalloc(dev, size: sizeof(*di), GFP_KERNEL); |
707 | if (!di) |
708 | return -ENOMEM; |
709 | |
710 | di->bm = &ab8500_bm_data; |
711 | |
712 | /* get parent data */ |
713 | di->dev = dev; |
714 | di->parent = dev_get_drvdata(dev: pdev->dev.parent); |
715 | |
716 | /* Get thermal zone and ADC */ |
717 | di->tz = thermal_zone_get_zone_by_name(name: "battery-thermal" ); |
718 | if (IS_ERR(ptr: di->tz)) { |
719 | ret = PTR_ERR(ptr: di->tz); |
720 | /* |
721 | * This usually just means we are probing before the thermal |
722 | * zone, so just defer. |
723 | */ |
724 | if (ret == -ENODEV) |
725 | ret = -EPROBE_DEFER; |
726 | return dev_err_probe(dev, err: ret, |
727 | fmt: "failed to get battery thermal zone\n" ); |
728 | } |
729 | di->bat_ctrl = devm_iio_channel_get(dev, consumer_channel: "bat_ctrl" ); |
730 | if (IS_ERR(ptr: di->bat_ctrl)) { |
731 | ret = dev_err_probe(dev, err: PTR_ERR(ptr: di->bat_ctrl), |
732 | fmt: "failed to get BAT CTRL ADC channel\n" ); |
733 | return ret; |
734 | } |
735 | |
736 | di->initialized = false; |
737 | |
738 | psy_cfg.supplied_to = supply_interface; |
739 | psy_cfg.num_supplicants = ARRAY_SIZE(supply_interface); |
740 | psy_cfg.drv_data = di; |
741 | |
742 | /* Init work for measuring temperature periodically */ |
743 | INIT_DEFERRABLE_WORK(&di->btemp_periodic_work, |
744 | ab8500_btemp_periodic_work); |
745 | |
746 | /* Set BTEMP thermal limits. Low and Med are fixed */ |
747 | di->btemp_ranges.btemp_low_limit = BTEMP_THERMAL_LOW_LIMIT; |
748 | di->btemp_ranges.btemp_med_limit = BTEMP_THERMAL_MED_LIMIT; |
749 | |
750 | ret = abx500_get_register_interruptible(dev, AB8500_CHARGER, |
751 | AB8500_BTEMP_HIGH_TH, value: &val); |
752 | if (ret < 0) { |
753 | dev_err(dev, "%s ab8500 read failed\n" , __func__); |
754 | return ret; |
755 | } |
756 | switch (val) { |
757 | case BTEMP_HIGH_TH_57_0: |
758 | case BTEMP_HIGH_TH_57_1: |
759 | di->btemp_ranges.btemp_high_limit = |
760 | BTEMP_THERMAL_HIGH_LIMIT_57; |
761 | break; |
762 | case BTEMP_HIGH_TH_52: |
763 | di->btemp_ranges.btemp_high_limit = |
764 | BTEMP_THERMAL_HIGH_LIMIT_52; |
765 | break; |
766 | case BTEMP_HIGH_TH_62: |
767 | di->btemp_ranges.btemp_high_limit = |
768 | BTEMP_THERMAL_HIGH_LIMIT_62; |
769 | break; |
770 | } |
771 | |
772 | /* Register BTEMP power supply class */ |
773 | di->btemp_psy = devm_power_supply_register(parent: dev, desc: &ab8500_btemp_desc, |
774 | cfg: &psy_cfg); |
775 | if (IS_ERR(ptr: di->btemp_psy)) { |
776 | dev_err(dev, "failed to register BTEMP psy\n" ); |
777 | return PTR_ERR(ptr: di->btemp_psy); |
778 | } |
779 | |
780 | /* Register interrupts */ |
781 | for (i = 0; i < ARRAY_SIZE(ab8500_btemp_irq); i++) { |
782 | irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name); |
783 | if (irq < 0) |
784 | return irq; |
785 | |
786 | ret = devm_request_threaded_irq(dev, irq, NULL, |
787 | thread_fn: ab8500_btemp_irq[i].isr, |
788 | IRQF_SHARED | IRQF_NO_SUSPEND | IRQF_ONESHOT, |
789 | devname: ab8500_btemp_irq[i].name, dev_id: di); |
790 | |
791 | if (ret) { |
792 | dev_err(dev, "failed to request %s IRQ %d: %d\n" |
793 | , ab8500_btemp_irq[i].name, irq, ret); |
794 | return ret; |
795 | } |
796 | dev_dbg(dev, "Requested %s IRQ %d: %d\n" , |
797 | ab8500_btemp_irq[i].name, irq, ret); |
798 | } |
799 | |
800 | platform_set_drvdata(pdev, data: di); |
801 | |
802 | list_add_tail(new: &di->node, head: &ab8500_btemp_list); |
803 | |
804 | return component_add(dev, &ab8500_btemp_component_ops); |
805 | } |
806 | |
807 | static void ab8500_btemp_remove(struct platform_device *pdev) |
808 | { |
809 | component_del(&pdev->dev, &ab8500_btemp_component_ops); |
810 | } |
811 | |
812 | static SIMPLE_DEV_PM_OPS(ab8500_btemp_pm_ops, ab8500_btemp_suspend, ab8500_btemp_resume); |
813 | |
814 | static const struct of_device_id ab8500_btemp_match[] = { |
815 | { .compatible = "stericsson,ab8500-btemp" , }, |
816 | { }, |
817 | }; |
818 | MODULE_DEVICE_TABLE(of, ab8500_btemp_match); |
819 | |
820 | struct platform_driver ab8500_btemp_driver = { |
821 | .probe = ab8500_btemp_probe, |
822 | .remove_new = ab8500_btemp_remove, |
823 | .driver = { |
824 | .name = "ab8500-btemp" , |
825 | .of_match_table = ab8500_btemp_match, |
826 | .pm = &ab8500_btemp_pm_ops, |
827 | }, |
828 | }; |
829 | MODULE_LICENSE("GPL v2" ); |
830 | MODULE_AUTHOR("Johan Palsson, Karl Komierowski, Arun R Murthy" ); |
831 | MODULE_ALIAS("platform:ab8500-btemp" ); |
832 | MODULE_DESCRIPTION("AB8500 battery temperature driver" ); |
833 | |