Commit | Line | Data |
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28db3888 HZ |
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/i2c.h> | |
15 | #include <linux/interrupt.h> | |
16 | #include <linux/platform_device.h> | |
17 | #include <linux/power_supply.h> | |
18 | #include <linux/mfd/max8925.h> | |
19 | ||
20 | /* registers in GPM */ | |
21 | #define MAX8925_OUT5VEN 0x54 | |
22 | #define MAX8925_OUT3VEN 0x58 | |
23 | #define MAX8925_CHG_CNTL1 0x7c | |
24 | ||
25 | /* bits definition */ | |
26 | #define MAX8925_CHG_STAT_VSYSLOW (1 << 0) | |
27 | #define MAX8925_CHG_STAT_MODE_MASK (3 << 2) | |
28 | #define MAX8925_CHG_STAT_EN_MASK (1 << 4) | |
29 | #define MAX8925_CHG_MBDET (1 << 1) | |
30 | #define MAX8925_CHG_AC_RANGE_MASK (3 << 6) | |
31 | ||
32 | /* registers in ADC */ | |
33 | #define MAX8925_ADC_RES_CNFG1 0x06 | |
34 | #define MAX8925_ADC_AVG_CNFG1 0x07 | |
35 | #define MAX8925_ADC_ACQ_CNFG1 0x08 | |
36 | #define MAX8925_ADC_ACQ_CNFG2 0x09 | |
37 | /* 2 bytes registers in below. MSB is 1st, LSB is 2nd. */ | |
38 | #define MAX8925_ADC_AUX2 0x62 | |
39 | #define MAX8925_ADC_VCHG 0x64 | |
40 | #define MAX8925_ADC_VBBATT 0x66 | |
41 | #define MAX8925_ADC_VMBATT 0x68 | |
42 | #define MAX8925_ADC_ISNS 0x6a | |
43 | #define MAX8925_ADC_THM 0x6c | |
44 | #define MAX8925_ADC_TDIE 0x6e | |
45 | #define MAX8925_CMD_AUX2 0xc8 | |
46 | #define MAX8925_CMD_VCHG 0xd0 | |
47 | #define MAX8925_CMD_VBBATT 0xd8 | |
48 | #define MAX8925_CMD_VMBATT 0xe0 | |
49 | #define MAX8925_CMD_ISNS 0xe8 | |
50 | #define MAX8925_CMD_THM 0xf0 | |
51 | #define MAX8925_CMD_TDIE 0xf8 | |
52 | ||
53 | enum { | |
54 | MEASURE_AUX2, | |
55 | MEASURE_VCHG, | |
56 | MEASURE_VBBATT, | |
57 | MEASURE_VMBATT, | |
58 | MEASURE_ISNS, | |
59 | MEASURE_THM, | |
60 | MEASURE_TDIE, | |
61 | MEASURE_MAX, | |
62 | }; | |
63 | ||
64 | struct max8925_power_info { | |
65 | struct max8925_chip *chip; | |
66 | struct i2c_client *gpm; | |
67 | struct i2c_client *adc; | |
68 | ||
69 | struct power_supply ac; | |
70 | struct power_supply usb; | |
71 | struct power_supply battery; | |
72 | int irq_base; | |
73 | unsigned ac_online:1; | |
74 | unsigned usb_online:1; | |
75 | unsigned bat_online:1; | |
76 | unsigned chg_mode:2; | |
77 | unsigned batt_detect:1; /* detecing MB by ID pin */ | |
78 | unsigned topoff_threshold:2; | |
79 | unsigned fast_charge:3; | |
80 | ||
81 | int (*set_charger) (int); | |
82 | }; | |
83 | ||
84 | static int __set_charger(struct max8925_power_info *info, int enable) | |
85 | { | |
86 | struct max8925_chip *chip = info->chip; | |
87 | if (enable) { | |
88 | /* enable charger in platform */ | |
89 | if (info->set_charger) | |
90 | info->set_charger(1); | |
91 | /* enable charger */ | |
92 | max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 0); | |
93 | } else { | |
94 | /* disable charge */ | |
95 | max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 1 << 7); | |
96 | if (info->set_charger) | |
97 | info->set_charger(0); | |
98 | } | |
99 | dev_dbg(chip->dev, "%s\n", (enable) ? "Enable charger" | |
100 | : "Disable charger"); | |
101 | return 0; | |
102 | } | |
103 | ||
104 | static irqreturn_t max8925_charger_handler(int irq, void *data) | |
105 | { | |
106 | struct max8925_power_info *info = (struct max8925_power_info *)data; | |
107 | struct max8925_chip *chip = info->chip; | |
108 | ||
109 | switch (irq - chip->irq_base) { | |
110 | case MAX8925_IRQ_VCHG_DC_R: | |
111 | info->ac_online = 1; | |
112 | __set_charger(info, 1); | |
113 | dev_dbg(chip->dev, "Adapter inserted\n"); | |
114 | break; | |
115 | case MAX8925_IRQ_VCHG_DC_F: | |
116 | info->ac_online = 0; | |
117 | __set_charger(info, 0); | |
118 | dev_dbg(chip->dev, "Adapter is removal\n"); | |
119 | break; | |
120 | case MAX8925_IRQ_VCHG_USB_R: | |
121 | info->usb_online = 1; | |
122 | __set_charger(info, 1); | |
123 | dev_dbg(chip->dev, "USB inserted\n"); | |
124 | break; | |
125 | case MAX8925_IRQ_VCHG_USB_F: | |
126 | info->usb_online = 0; | |
127 | __set_charger(info, 0); | |
128 | dev_dbg(chip->dev, "USB is removal\n"); | |
129 | break; | |
130 | case MAX8925_IRQ_VCHG_THM_OK_F: | |
131 | /* Battery is not ready yet */ | |
132 | dev_dbg(chip->dev, "Battery temperature is out of range\n"); | |
133 | case MAX8925_IRQ_VCHG_DC_OVP: | |
134 | dev_dbg(chip->dev, "Error detection\n"); | |
135 | __set_charger(info, 0); | |
136 | break; | |
137 | case MAX8925_IRQ_VCHG_THM_OK_R: | |
138 | /* Battery is ready now */ | |
139 | dev_dbg(chip->dev, "Battery temperature is in range\n"); | |
140 | break; | |
141 | case MAX8925_IRQ_VCHG_SYSLOW_R: | |
142 | /* VSYS is low */ | |
143 | dev_info(chip->dev, "Sys power is too low\n"); | |
144 | break; | |
145 | case MAX8925_IRQ_VCHG_SYSLOW_F: | |
146 | dev_dbg(chip->dev, "Sys power is above low threshold\n"); | |
147 | break; | |
148 | case MAX8925_IRQ_VCHG_DONE: | |
149 | __set_charger(info, 0); | |
150 | dev_dbg(chip->dev, "Charging is done\n"); | |
151 | break; | |
152 | case MAX8925_IRQ_VCHG_TOPOFF: | |
153 | dev_dbg(chip->dev, "Charging in top-off mode\n"); | |
154 | break; | |
155 | case MAX8925_IRQ_VCHG_TMR_FAULT: | |
156 | __set_charger(info, 0); | |
157 | dev_dbg(chip->dev, "Safe timer is expired\n"); | |
158 | break; | |
159 | case MAX8925_IRQ_VCHG_RST: | |
160 | __set_charger(info, 0); | |
161 | dev_dbg(chip->dev, "Charger is reset\n"); | |
162 | break; | |
163 | } | |
164 | return IRQ_HANDLED; | |
165 | } | |
166 | ||
167 | static int start_measure(struct max8925_power_info *info, int type) | |
168 | { | |
169 | unsigned char buf[2] = {0, 0}; | |
170 | int meas_reg = 0, ret; | |
171 | ||
172 | switch (type) { | |
173 | case MEASURE_VCHG: | |
174 | meas_reg = MAX8925_ADC_VCHG; | |
175 | break; | |
176 | case MEASURE_VBBATT: | |
177 | meas_reg = MAX8925_ADC_VBBATT; | |
178 | break; | |
179 | case MEASURE_VMBATT: | |
180 | meas_reg = MAX8925_ADC_VMBATT; | |
181 | break; | |
182 | case MEASURE_ISNS: | |
183 | meas_reg = MAX8925_ADC_ISNS; | |
184 | break; | |
185 | default: | |
186 | return -EINVAL; | |
187 | } | |
188 | ||
189 | max8925_bulk_read(info->adc, meas_reg, 2, buf); | |
190 | ret = (buf[0] << 4) | (buf[1] >> 4); | |
191 | ||
192 | return ret; | |
193 | } | |
194 | ||
195 | static int max8925_ac_get_prop(struct power_supply *psy, | |
196 | enum power_supply_property psp, | |
197 | union power_supply_propval *val) | |
198 | { | |
199 | struct max8925_power_info *info = dev_get_drvdata(psy->dev->parent); | |
200 | int ret = 0; | |
201 | ||
202 | switch (psp) { | |
203 | case POWER_SUPPLY_PROP_ONLINE: | |
204 | val->intval = info->ac_online; | |
205 | break; | |
206 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: | |
207 | if (info->ac_online) { | |
208 | ret = start_measure(info, MEASURE_VCHG); | |
209 | if (ret >= 0) { | |
210 | val->intval = ret << 1; /* unit is mV */ | |
211 | goto out; | |
212 | } | |
213 | } | |
214 | ret = -ENODATA; | |
215 | break; | |
216 | default: | |
217 | ret = -ENODEV; | |
218 | break; | |
219 | } | |
220 | out: | |
221 | return ret; | |
222 | } | |
223 | ||
224 | static enum power_supply_property max8925_ac_props[] = { | |
225 | POWER_SUPPLY_PROP_ONLINE, | |
226 | POWER_SUPPLY_PROP_VOLTAGE_NOW, | |
227 | }; | |
228 | ||
229 | static int max8925_usb_get_prop(struct power_supply *psy, | |
230 | enum power_supply_property psp, | |
231 | union power_supply_propval *val) | |
232 | { | |
233 | struct max8925_power_info *info = dev_get_drvdata(psy->dev->parent); | |
234 | int ret = 0; | |
235 | ||
236 | switch (psp) { | |
237 | case POWER_SUPPLY_PROP_ONLINE: | |
238 | val->intval = info->usb_online; | |
239 | break; | |
240 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: | |
241 | if (info->usb_online) { | |
242 | ret = start_measure(info, MEASURE_VCHG); | |
243 | if (ret >= 0) { | |
244 | val->intval = ret << 1; /* unit is mV */ | |
245 | goto out; | |
246 | } | |
247 | } | |
248 | ret = -ENODATA; | |
249 | break; | |
250 | default: | |
251 | ret = -ENODEV; | |
252 | break; | |
253 | } | |
254 | out: | |
255 | return ret; | |
256 | } | |
257 | ||
258 | static enum power_supply_property max8925_usb_props[] = { | |
259 | POWER_SUPPLY_PROP_ONLINE, | |
260 | POWER_SUPPLY_PROP_VOLTAGE_NOW, | |
261 | }; | |
262 | ||
263 | static int max8925_bat_get_prop(struct power_supply *psy, | |
264 | enum power_supply_property psp, | |
265 | union power_supply_propval *val) | |
266 | { | |
267 | struct max8925_power_info *info = dev_get_drvdata(psy->dev->parent); | |
268 | long long int tmp = 0; | |
269 | int ret = 0; | |
270 | ||
271 | switch (psp) { | |
272 | case POWER_SUPPLY_PROP_ONLINE: | |
273 | val->intval = info->bat_online; | |
274 | break; | |
275 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: | |
276 | if (info->bat_online) { | |
277 | ret = start_measure(info, MEASURE_VMBATT); | |
278 | if (ret >= 0) { | |
279 | val->intval = ret << 1; /* unit is mV */ | |
280 | ret = 0; | |
281 | break; | |
282 | } | |
283 | } | |
284 | ret = -ENODATA; | |
285 | break; | |
286 | case POWER_SUPPLY_PROP_CURRENT_NOW: | |
287 | if (info->bat_online) { | |
288 | ret = start_measure(info, MEASURE_ISNS); | |
289 | if (ret >= 0) { | |
290 | tmp = (long long int)ret * 6250 / 4096 - 3125; | |
291 | ret = (int)tmp; | |
292 | val->intval = 0; | |
293 | if (ret > 0) | |
294 | val->intval = ret; /* unit is mA */ | |
295 | ret = 0; | |
296 | break; | |
297 | } | |
298 | } | |
299 | ret = -ENODATA; | |
300 | break; | |
301 | case POWER_SUPPLY_PROP_CHARGE_TYPE: | |
302 | if (!info->bat_online) { | |
303 | ret = -ENODATA; | |
304 | break; | |
305 | } | |
306 | ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS); | |
307 | ret = (ret & MAX8925_CHG_STAT_MODE_MASK) >> 2; | |
308 | switch (ret) { | |
309 | case 1: | |
310 | val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST; | |
311 | break; | |
312 | case 0: | |
313 | case 2: | |
314 | val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE; | |
315 | break; | |
316 | case 3: | |
317 | val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE; | |
318 | break; | |
319 | } | |
320 | ret = 0; | |
321 | break; | |
322 | case POWER_SUPPLY_PROP_STATUS: | |
323 | if (!info->bat_online) { | |
324 | ret = -ENODATA; | |
325 | break; | |
326 | } | |
327 | ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS); | |
328 | if (info->usb_online || info->ac_online) { | |
329 | val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; | |
330 | if (ret & MAX8925_CHG_STAT_EN_MASK) | |
331 | val->intval = POWER_SUPPLY_STATUS_CHARGING; | |
332 | } else | |
333 | val->intval = POWER_SUPPLY_STATUS_DISCHARGING; | |
334 | ret = 0; | |
335 | break; | |
336 | default: | |
337 | ret = -ENODEV; | |
338 | break; | |
339 | } | |
340 | return ret; | |
341 | } | |
342 | ||
343 | static enum power_supply_property max8925_battery_props[] = { | |
344 | POWER_SUPPLY_PROP_ONLINE, | |
345 | POWER_SUPPLY_PROP_VOLTAGE_NOW, | |
346 | POWER_SUPPLY_PROP_CURRENT_NOW, | |
347 | POWER_SUPPLY_PROP_CHARGE_TYPE, | |
348 | POWER_SUPPLY_PROP_STATUS, | |
349 | }; | |
350 | ||
351 | #define REQUEST_IRQ(_irq, _name) \ | |
352 | do { \ | |
353 | ret = request_threaded_irq(chip->irq_base + _irq, NULL, \ | |
354 | max8925_charger_handler, \ | |
355 | IRQF_ONESHOT, _name, info); \ | |
356 | if (ret) \ | |
357 | dev_err(chip->dev, "Failed to request IRQ #%d: %d\n", \ | |
358 | _irq, ret); \ | |
359 | } while (0) | |
360 | ||
361 | static __devinit int max8925_init_charger(struct max8925_chip *chip, | |
362 | struct max8925_power_info *info) | |
363 | { | |
364 | int ret; | |
365 | ||
366 | REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_OVP, "ac-ovp"); | |
367 | REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_F, "ac-remove"); | |
368 | REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_R, "ac-insert"); | |
369 | REQUEST_IRQ(MAX8925_IRQ_VCHG_USB_OVP, "usb-ovp"); | |
370 | REQUEST_IRQ(MAX8925_IRQ_VCHG_USB_F, "usb-remove"); | |
371 | REQUEST_IRQ(MAX8925_IRQ_VCHG_USB_R, "usb-insert"); | |
372 | REQUEST_IRQ(MAX8925_IRQ_VCHG_THM_OK_R, "batt-temp-in-range"); | |
373 | REQUEST_IRQ(MAX8925_IRQ_VCHG_THM_OK_F, "batt-temp-out-range"); | |
374 | REQUEST_IRQ(MAX8925_IRQ_VCHG_SYSLOW_F, "vsys-high"); | |
375 | REQUEST_IRQ(MAX8925_IRQ_VCHG_SYSLOW_R, "vsys-low"); | |
376 | REQUEST_IRQ(MAX8925_IRQ_VCHG_RST, "charger-reset"); | |
377 | REQUEST_IRQ(MAX8925_IRQ_VCHG_DONE, "charger-done"); | |
378 | REQUEST_IRQ(MAX8925_IRQ_VCHG_TOPOFF, "charger-topoff"); | |
379 | REQUEST_IRQ(MAX8925_IRQ_VCHG_TMR_FAULT, "charger-timer-expire"); | |
380 | ||
381 | info->ac_online = 0; | |
382 | info->usb_online = 0; | |
383 | info->bat_online = 0; | |
384 | ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS); | |
385 | if (ret >= 0) { | |
386 | /* | |
387 | * If battery detection is enabled, ID pin of battery is | |
388 | * connected to MBDET pin of MAX8925. It could be used to | |
389 | * detect battery presence. | |
390 | * Otherwise, we have to assume that battery is always on. | |
391 | */ | |
392 | if (info->batt_detect) | |
393 | info->bat_online = (ret & MAX8925_CHG_MBDET) ? 0 : 1; | |
394 | else | |
395 | info->bat_online = 1; | |
396 | if (ret & MAX8925_CHG_AC_RANGE_MASK) | |
397 | info->ac_online = 1; | |
398 | else | |
399 | info->ac_online = 0; | |
400 | } | |
401 | /* disable charge */ | |
402 | max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 1 << 7); | |
403 | /* set charging current in charge topoff mode */ | |
404 | max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 3 << 5, | |
405 | info->topoff_threshold << 5); | |
406 | /* set charing current in fast charge mode */ | |
407 | max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 7, info->fast_charge); | |
408 | ||
409 | return 0; | |
410 | } | |
411 | ||
412 | static __devexit int max8925_deinit_charger(struct max8925_power_info *info) | |
413 | { | |
414 | struct max8925_chip *chip = info->chip; | |
415 | int irq; | |
416 | ||
417 | irq = chip->irq_base + MAX8925_IRQ_VCHG_DC_OVP; | |
418 | for (; irq <= chip->irq_base + MAX8925_IRQ_VCHG_TMR_FAULT; irq++) | |
419 | free_irq(irq, info); | |
420 | ||
421 | return 0; | |
422 | } | |
423 | ||
424 | static __devinit int max8925_power_probe(struct platform_device *pdev) | |
425 | { | |
426 | struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); | |
427 | struct max8925_platform_data *max8925_pdata; | |
428 | struct max8925_power_pdata *pdata = NULL; | |
429 | struct max8925_power_info *info; | |
430 | int ret; | |
431 | ||
432 | if (pdev->dev.parent->platform_data) { | |
433 | max8925_pdata = pdev->dev.parent->platform_data; | |
434 | pdata = max8925_pdata->power; | |
435 | } | |
436 | ||
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 | ||
450 | info->ac.name = "max8925-ac"; | |
451 | info->ac.type = POWER_SUPPLY_TYPE_MAINS; | |
452 | info->ac.properties = max8925_ac_props; | |
453 | info->ac.num_properties = ARRAY_SIZE(max8925_ac_props); | |
454 | info->ac.get_property = max8925_ac_get_prop; | |
455 | ret = power_supply_register(&pdev->dev, &info->ac); | |
456 | if (ret) | |
457 | goto out; | |
458 | info->ac.dev->parent = &pdev->dev; | |
459 | ||
460 | info->usb.name = "max8925-usb"; | |
461 | info->usb.type = POWER_SUPPLY_TYPE_USB; | |
462 | info->usb.properties = max8925_usb_props; | |
463 | info->usb.num_properties = ARRAY_SIZE(max8925_usb_props); | |
464 | info->usb.get_property = max8925_usb_get_prop; | |
465 | ret = power_supply_register(&pdev->dev, &info->usb); | |
466 | if (ret) | |
467 | goto out_usb; | |
468 | info->usb.dev->parent = &pdev->dev; | |
469 | ||
470 | info->battery.name = "max8925-battery"; | |
471 | info->battery.type = POWER_SUPPLY_TYPE_BATTERY; | |
472 | info->battery.properties = max8925_battery_props; | |
473 | info->battery.num_properties = ARRAY_SIZE(max8925_battery_props); | |
474 | info->battery.get_property = max8925_bat_get_prop; | |
475 | ret = power_supply_register(&pdev->dev, &info->battery); | |
476 | if (ret) | |
477 | goto out_battery; | |
478 | info->battery.dev->parent = &pdev->dev; | |
479 | ||
480 | info->batt_detect = pdata->batt_detect; | |
481 | info->topoff_threshold = pdata->topoff_threshold; | |
482 | info->fast_charge = pdata->fast_charge; | |
483 | info->set_charger = pdata->set_charger; | |
484 | dev_set_drvdata(&pdev->dev, info); | |
485 | platform_set_drvdata(pdev, info); | |
486 | ||
487 | max8925_init_charger(chip, info); | |
488 | return 0; | |
489 | out_battery: | |
490 | power_supply_unregister(&info->battery); | |
491 | out_usb: | |
492 | power_supply_unregister(&info->ac); | |
493 | out: | |
494 | kfree(info); | |
495 | return ret; | |
496 | } | |
497 | ||
498 | static __devexit int max8925_power_remove(struct platform_device *pdev) | |
499 | { | |
500 | struct max8925_power_info *info = platform_get_drvdata(pdev); | |
501 | ||
502 | if (info) { | |
503 | power_supply_unregister(&info->ac); | |
504 | power_supply_unregister(&info->usb); | |
505 | power_supply_unregister(&info->battery); | |
506 | max8925_deinit_charger(info); | |
507 | kfree(info); | |
508 | } | |
509 | return 0; | |
510 | } | |
511 | ||
512 | static struct platform_driver max8925_power_driver = { | |
513 | .probe = max8925_power_probe, | |
514 | .remove = __devexit_p(max8925_power_remove), | |
515 | .driver = { | |
516 | .name = "max8925-power", | |
517 | }, | |
518 | }; | |
519 | ||
520 | static int __init max8925_power_init(void) | |
521 | { | |
522 | return platform_driver_register(&max8925_power_driver); | |
523 | } | |
524 | module_init(max8925_power_init); | |
525 | ||
526 | static void __exit max8925_power_exit(void) | |
527 | { | |
528 | platform_driver_unregister(&max8925_power_driver); | |
529 | } | |
530 | module_exit(max8925_power_exit); | |
531 | ||
532 | MODULE_LICENSE("GPL"); | |
533 | MODULE_DESCRIPTION("Power supply driver for MAX8925"); | |
534 | MODULE_ALIAS("platform:max8925-power"); |