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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> | |
5a0e3ad6 | 14 | #include <linux/slab.h> |
28db3888 HZ |
15 | #include <linux/i2c.h> |
16 | #include <linux/interrupt.h> | |
17 | #include <linux/platform_device.h> | |
18 | #include <linux/power_supply.h> | |
19 | #include <linux/mfd/max8925.h> | |
20 | ||
21 | /* registers in GPM */ | |
22 | #define MAX8925_OUT5VEN 0x54 | |
23 | #define MAX8925_OUT3VEN 0x58 | |
24 | #define MAX8925_CHG_CNTL1 0x7c | |
25 | ||
26 | /* bits definition */ | |
27 | #define MAX8925_CHG_STAT_VSYSLOW (1 << 0) | |
28 | #define MAX8925_CHG_STAT_MODE_MASK (3 << 2) | |
29 | #define MAX8925_CHG_STAT_EN_MASK (1 << 4) | |
30 | #define MAX8925_CHG_MBDET (1 << 1) | |
31 | #define MAX8925_CHG_AC_RANGE_MASK (3 << 6) | |
32 | ||
33 | /* registers in ADC */ | |
34 | #define MAX8925_ADC_RES_CNFG1 0x06 | |
35 | #define MAX8925_ADC_AVG_CNFG1 0x07 | |
36 | #define MAX8925_ADC_ACQ_CNFG1 0x08 | |
37 | #define MAX8925_ADC_ACQ_CNFG2 0x09 | |
38 | /* 2 bytes registers in below. MSB is 1st, LSB is 2nd. */ | |
39 | #define MAX8925_ADC_AUX2 0x62 | |
40 | #define MAX8925_ADC_VCHG 0x64 | |
41 | #define MAX8925_ADC_VBBATT 0x66 | |
42 | #define MAX8925_ADC_VMBATT 0x68 | |
43 | #define MAX8925_ADC_ISNS 0x6a | |
44 | #define MAX8925_ADC_THM 0x6c | |
45 | #define MAX8925_ADC_TDIE 0x6e | |
46 | #define MAX8925_CMD_AUX2 0xc8 | |
47 | #define MAX8925_CMD_VCHG 0xd0 | |
48 | #define MAX8925_CMD_VBBATT 0xd8 | |
49 | #define MAX8925_CMD_VMBATT 0xe0 | |
50 | #define MAX8925_CMD_ISNS 0xe8 | |
51 | #define MAX8925_CMD_THM 0xf0 | |
52 | #define MAX8925_CMD_TDIE 0xf8 | |
53 | ||
54 | enum { | |
55 | MEASURE_AUX2, | |
56 | MEASURE_VCHG, | |
57 | MEASURE_VBBATT, | |
58 | MEASURE_VMBATT, | |
59 | MEASURE_ISNS, | |
60 | MEASURE_THM, | |
61 | MEASURE_TDIE, | |
62 | MEASURE_MAX, | |
63 | }; | |
64 | ||
65 | struct max8925_power_info { | |
66 | struct max8925_chip *chip; | |
67 | struct i2c_client *gpm; | |
68 | struct i2c_client *adc; | |
69 | ||
70 | struct power_supply ac; | |
71 | struct power_supply usb; | |
72 | struct power_supply battery; | |
73 | int irq_base; | |
74 | unsigned ac_online:1; | |
75 | unsigned usb_online:1; | |
76 | unsigned bat_online:1; | |
77 | unsigned chg_mode:2; | |
78 | unsigned batt_detect:1; /* detecing MB by ID pin */ | |
79 | unsigned topoff_threshold:2; | |
80 | unsigned fast_charge:3; | |
81 | ||
82 | int (*set_charger) (int); | |
83 | }; | |
84 | ||
85 | static int __set_charger(struct max8925_power_info *info, int enable) | |
86 | { | |
87 | struct max8925_chip *chip = info->chip; | |
88 | if (enable) { | |
89 | /* enable charger in platform */ | |
90 | if (info->set_charger) | |
91 | info->set_charger(1); | |
92 | /* enable charger */ | |
93 | max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 0); | |
94 | } else { | |
95 | /* disable charge */ | |
96 | max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 1 << 7); | |
97 | if (info->set_charger) | |
98 | info->set_charger(0); | |
99 | } | |
100 | dev_dbg(chip->dev, "%s\n", (enable) ? "Enable charger" | |
101 | : "Disable charger"); | |
102 | return 0; | |
103 | } | |
104 | ||
105 | static irqreturn_t max8925_charger_handler(int irq, void *data) | |
106 | { | |
107 | struct max8925_power_info *info = (struct max8925_power_info *)data; | |
108 | struct max8925_chip *chip = info->chip; | |
109 | ||
110 | switch (irq - chip->irq_base) { | |
111 | case MAX8925_IRQ_VCHG_DC_R: | |
112 | info->ac_online = 1; | |
113 | __set_charger(info, 1); | |
114 | dev_dbg(chip->dev, "Adapter inserted\n"); | |
115 | break; | |
116 | case MAX8925_IRQ_VCHG_DC_F: | |
117 | info->ac_online = 0; | |
118 | __set_charger(info, 0); | |
119 | dev_dbg(chip->dev, "Adapter is removal\n"); | |
120 | break; | |
121 | case MAX8925_IRQ_VCHG_USB_R: | |
122 | info->usb_online = 1; | |
123 | __set_charger(info, 1); | |
124 | dev_dbg(chip->dev, "USB inserted\n"); | |
125 | break; | |
126 | case MAX8925_IRQ_VCHG_USB_F: | |
127 | info->usb_online = 0; | |
128 | __set_charger(info, 0); | |
129 | dev_dbg(chip->dev, "USB is removal\n"); | |
130 | break; | |
131 | case MAX8925_IRQ_VCHG_THM_OK_F: | |
132 | /* Battery is not ready yet */ | |
133 | dev_dbg(chip->dev, "Battery temperature is out of range\n"); | |
134 | case MAX8925_IRQ_VCHG_DC_OVP: | |
135 | dev_dbg(chip->dev, "Error detection\n"); | |
136 | __set_charger(info, 0); | |
137 | break; | |
138 | case MAX8925_IRQ_VCHG_THM_OK_R: | |
139 | /* Battery is ready now */ | |
140 | dev_dbg(chip->dev, "Battery temperature is in range\n"); | |
141 | break; | |
142 | case MAX8925_IRQ_VCHG_SYSLOW_R: | |
143 | /* VSYS is low */ | |
144 | dev_info(chip->dev, "Sys power is too low\n"); | |
145 | break; | |
146 | case MAX8925_IRQ_VCHG_SYSLOW_F: | |
147 | dev_dbg(chip->dev, "Sys power is above low threshold\n"); | |
148 | break; | |
149 | case MAX8925_IRQ_VCHG_DONE: | |
150 | __set_charger(info, 0); | |
151 | dev_dbg(chip->dev, "Charging is done\n"); | |
152 | break; | |
153 | case MAX8925_IRQ_VCHG_TOPOFF: | |
154 | dev_dbg(chip->dev, "Charging in top-off mode\n"); | |
155 | break; | |
156 | case MAX8925_IRQ_VCHG_TMR_FAULT: | |
157 | __set_charger(info, 0); | |
158 | dev_dbg(chip->dev, "Safe timer is expired\n"); | |
159 | break; | |
160 | case MAX8925_IRQ_VCHG_RST: | |
161 | __set_charger(info, 0); | |
162 | dev_dbg(chip->dev, "Charger is reset\n"); | |
163 | break; | |
164 | } | |
165 | return IRQ_HANDLED; | |
166 | } | |
167 | ||
168 | static int start_measure(struct max8925_power_info *info, int type) | |
169 | { | |
170 | unsigned char buf[2] = {0, 0}; | |
171 | int meas_reg = 0, ret; | |
172 | ||
173 | switch (type) { | |
174 | case MEASURE_VCHG: | |
175 | meas_reg = MAX8925_ADC_VCHG; | |
176 | break; | |
177 | case MEASURE_VBBATT: | |
178 | meas_reg = MAX8925_ADC_VBBATT; | |
179 | break; | |
180 | case MEASURE_VMBATT: | |
181 | meas_reg = MAX8925_ADC_VMBATT; | |
182 | break; | |
183 | case MEASURE_ISNS: | |
184 | meas_reg = MAX8925_ADC_ISNS; | |
185 | break; | |
186 | default: | |
187 | return -EINVAL; | |
188 | } | |
189 | ||
190 | max8925_bulk_read(info->adc, meas_reg, 2, buf); | |
191 | ret = (buf[0] << 4) | (buf[1] >> 4); | |
192 | ||
193 | return ret; | |
194 | } | |
195 | ||
196 | static int max8925_ac_get_prop(struct power_supply *psy, | |
197 | enum power_supply_property psp, | |
198 | union power_supply_propval *val) | |
199 | { | |
200 | struct max8925_power_info *info = dev_get_drvdata(psy->dev->parent); | |
201 | int ret = 0; | |
202 | ||
203 | switch (psp) { | |
204 | case POWER_SUPPLY_PROP_ONLINE: | |
205 | val->intval = info->ac_online; | |
206 | break; | |
207 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: | |
208 | if (info->ac_online) { | |
209 | ret = start_measure(info, MEASURE_VCHG); | |
210 | if (ret >= 0) { | |
211 | val->intval = ret << 1; /* unit is mV */ | |
212 | goto out; | |
213 | } | |
214 | } | |
215 | ret = -ENODATA; | |
216 | break; | |
217 | default: | |
218 | ret = -ENODEV; | |
219 | break; | |
220 | } | |
221 | out: | |
222 | return ret; | |
223 | } | |
224 | ||
225 | static enum power_supply_property max8925_ac_props[] = { | |
226 | POWER_SUPPLY_PROP_ONLINE, | |
227 | POWER_SUPPLY_PROP_VOLTAGE_NOW, | |
228 | }; | |
229 | ||
230 | static int max8925_usb_get_prop(struct power_supply *psy, | |
231 | enum power_supply_property psp, | |
232 | union power_supply_propval *val) | |
233 | { | |
234 | struct max8925_power_info *info = dev_get_drvdata(psy->dev->parent); | |
235 | int ret = 0; | |
236 | ||
237 | switch (psp) { | |
238 | case POWER_SUPPLY_PROP_ONLINE: | |
239 | val->intval = info->usb_online; | |
240 | break; | |
241 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: | |
242 | if (info->usb_online) { | |
243 | ret = start_measure(info, MEASURE_VCHG); | |
244 | if (ret >= 0) { | |
245 | val->intval = ret << 1; /* unit is mV */ | |
246 | goto out; | |
247 | } | |
248 | } | |
249 | ret = -ENODATA; | |
250 | break; | |
251 | default: | |
252 | ret = -ENODEV; | |
253 | break; | |
254 | } | |
255 | out: | |
256 | return ret; | |
257 | } | |
258 | ||
259 | static enum power_supply_property max8925_usb_props[] = { | |
260 | POWER_SUPPLY_PROP_ONLINE, | |
261 | POWER_SUPPLY_PROP_VOLTAGE_NOW, | |
262 | }; | |
263 | ||
264 | static int max8925_bat_get_prop(struct power_supply *psy, | |
265 | enum power_supply_property psp, | |
266 | union power_supply_propval *val) | |
267 | { | |
268 | struct max8925_power_info *info = dev_get_drvdata(psy->dev->parent); | |
269 | long long int tmp = 0; | |
270 | int ret = 0; | |
271 | ||
272 | switch (psp) { | |
273 | case POWER_SUPPLY_PROP_ONLINE: | |
274 | val->intval = info->bat_online; | |
275 | break; | |
276 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: | |
277 | if (info->bat_online) { | |
278 | ret = start_measure(info, MEASURE_VMBATT); | |
279 | if (ret >= 0) { | |
280 | val->intval = ret << 1; /* unit is mV */ | |
281 | ret = 0; | |
282 | break; | |
283 | } | |
284 | } | |
285 | ret = -ENODATA; | |
286 | break; | |
287 | case POWER_SUPPLY_PROP_CURRENT_NOW: | |
288 | if (info->bat_online) { | |
289 | ret = start_measure(info, MEASURE_ISNS); | |
290 | if (ret >= 0) { | |
291 | tmp = (long long int)ret * 6250 / 4096 - 3125; | |
292 | ret = (int)tmp; | |
293 | val->intval = 0; | |
294 | if (ret > 0) | |
295 | val->intval = ret; /* unit is mA */ | |
296 | ret = 0; | |
297 | break; | |
298 | } | |
299 | } | |
300 | ret = -ENODATA; | |
301 | break; | |
302 | case POWER_SUPPLY_PROP_CHARGE_TYPE: | |
303 | if (!info->bat_online) { | |
304 | ret = -ENODATA; | |
305 | break; | |
306 | } | |
307 | ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS); | |
308 | ret = (ret & MAX8925_CHG_STAT_MODE_MASK) >> 2; | |
309 | switch (ret) { | |
310 | case 1: | |
311 | val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST; | |
312 | break; | |
313 | case 0: | |
314 | case 2: | |
315 | val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE; | |
316 | break; | |
317 | case 3: | |
318 | val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE; | |
319 | break; | |
320 | } | |
321 | ret = 0; | |
322 | break; | |
323 | case POWER_SUPPLY_PROP_STATUS: | |
324 | if (!info->bat_online) { | |
325 | ret = -ENODATA; | |
326 | break; | |
327 | } | |
328 | ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS); | |
329 | if (info->usb_online || info->ac_online) { | |
330 | val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; | |
331 | if (ret & MAX8925_CHG_STAT_EN_MASK) | |
332 | val->intval = POWER_SUPPLY_STATUS_CHARGING; | |
333 | } else | |
334 | val->intval = POWER_SUPPLY_STATUS_DISCHARGING; | |
335 | ret = 0; | |
336 | break; | |
337 | default: | |
338 | ret = -ENODEV; | |
339 | break; | |
340 | } | |
341 | return ret; | |
342 | } | |
343 | ||
344 | static enum power_supply_property max8925_battery_props[] = { | |
345 | POWER_SUPPLY_PROP_ONLINE, | |
346 | POWER_SUPPLY_PROP_VOLTAGE_NOW, | |
347 | POWER_SUPPLY_PROP_CURRENT_NOW, | |
348 | POWER_SUPPLY_PROP_CHARGE_TYPE, | |
349 | POWER_SUPPLY_PROP_STATUS, | |
350 | }; | |
351 | ||
352 | #define REQUEST_IRQ(_irq, _name) \ | |
353 | do { \ | |
354 | ret = request_threaded_irq(chip->irq_base + _irq, NULL, \ | |
355 | max8925_charger_handler, \ | |
356 | IRQF_ONESHOT, _name, info); \ | |
357 | if (ret) \ | |
358 | dev_err(chip->dev, "Failed to request IRQ #%d: %d\n", \ | |
359 | _irq, ret); \ | |
360 | } while (0) | |
361 | ||
362 | static __devinit int max8925_init_charger(struct max8925_chip *chip, | |
363 | struct max8925_power_info *info) | |
364 | { | |
365 | int ret; | |
366 | ||
367 | REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_OVP, "ac-ovp"); | |
368 | REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_F, "ac-remove"); | |
369 | REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_R, "ac-insert"); | |
370 | REQUEST_IRQ(MAX8925_IRQ_VCHG_USB_OVP, "usb-ovp"); | |
371 | REQUEST_IRQ(MAX8925_IRQ_VCHG_USB_F, "usb-remove"); | |
372 | REQUEST_IRQ(MAX8925_IRQ_VCHG_USB_R, "usb-insert"); | |
373 | REQUEST_IRQ(MAX8925_IRQ_VCHG_THM_OK_R, "batt-temp-in-range"); | |
374 | REQUEST_IRQ(MAX8925_IRQ_VCHG_THM_OK_F, "batt-temp-out-range"); | |
375 | REQUEST_IRQ(MAX8925_IRQ_VCHG_SYSLOW_F, "vsys-high"); | |
376 | REQUEST_IRQ(MAX8925_IRQ_VCHG_SYSLOW_R, "vsys-low"); | |
377 | REQUEST_IRQ(MAX8925_IRQ_VCHG_RST, "charger-reset"); | |
378 | REQUEST_IRQ(MAX8925_IRQ_VCHG_DONE, "charger-done"); | |
379 | REQUEST_IRQ(MAX8925_IRQ_VCHG_TOPOFF, "charger-topoff"); | |
380 | REQUEST_IRQ(MAX8925_IRQ_VCHG_TMR_FAULT, "charger-timer-expire"); | |
381 | ||
382 | info->ac_online = 0; | |
383 | info->usb_online = 0; | |
384 | info->bat_online = 0; | |
385 | ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS); | |
386 | if (ret >= 0) { | |
387 | /* | |
388 | * If battery detection is enabled, ID pin of battery is | |
389 | * connected to MBDET pin of MAX8925. It could be used to | |
390 | * detect battery presence. | |
391 | * Otherwise, we have to assume that battery is always on. | |
392 | */ | |
393 | if (info->batt_detect) | |
394 | info->bat_online = (ret & MAX8925_CHG_MBDET) ? 0 : 1; | |
395 | else | |
396 | info->bat_online = 1; | |
397 | if (ret & MAX8925_CHG_AC_RANGE_MASK) | |
398 | info->ac_online = 1; | |
399 | else | |
400 | info->ac_online = 0; | |
401 | } | |
402 | /* disable charge */ | |
403 | max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 1 << 7); | |
404 | /* set charging current in charge topoff mode */ | |
405 | max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 3 << 5, | |
406 | info->topoff_threshold << 5); | |
407 | /* set charing current in fast charge mode */ | |
408 | max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 7, info->fast_charge); | |
409 | ||
410 | return 0; | |
411 | } | |
412 | ||
413 | static __devexit int max8925_deinit_charger(struct max8925_power_info *info) | |
414 | { | |
415 | struct max8925_chip *chip = info->chip; | |
416 | int irq; | |
417 | ||
418 | irq = chip->irq_base + MAX8925_IRQ_VCHG_DC_OVP; | |
419 | for (; irq <= chip->irq_base + MAX8925_IRQ_VCHG_TMR_FAULT; irq++) | |
420 | free_irq(irq, info); | |
421 | ||
422 | return 0; | |
423 | } | |
424 | ||
425 | static __devinit int max8925_power_probe(struct platform_device *pdev) | |
426 | { | |
427 | struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); | |
428 | struct max8925_platform_data *max8925_pdata; | |
429 | struct max8925_power_pdata *pdata = NULL; | |
430 | struct max8925_power_info *info; | |
431 | int ret; | |
432 | ||
433 | if (pdev->dev.parent->platform_data) { | |
434 | max8925_pdata = pdev->dev.parent->platform_data; | |
435 | pdata = max8925_pdata->power; | |
436 | } | |
437 | ||
438 | if (!pdata) { | |
439 | dev_err(&pdev->dev, "platform data isn't assigned to " | |
440 | "power supply\n"); | |
441 | return -EINVAL; | |
442 | } | |
443 | ||
444 | info = kzalloc(sizeof(struct max8925_power_info), GFP_KERNEL); | |
445 | if (!info) | |
446 | return -ENOMEM; | |
447 | info->chip = chip; | |
448 | info->gpm = chip->i2c; | |
449 | info->adc = chip->adc; | |
450 | ||
451 | info->ac.name = "max8925-ac"; | |
452 | info->ac.type = POWER_SUPPLY_TYPE_MAINS; | |
453 | info->ac.properties = max8925_ac_props; | |
454 | info->ac.num_properties = ARRAY_SIZE(max8925_ac_props); | |
455 | info->ac.get_property = max8925_ac_get_prop; | |
456 | ret = power_supply_register(&pdev->dev, &info->ac); | |
457 | if (ret) | |
458 | goto out; | |
459 | info->ac.dev->parent = &pdev->dev; | |
460 | ||
461 | info->usb.name = "max8925-usb"; | |
462 | info->usb.type = POWER_SUPPLY_TYPE_USB; | |
463 | info->usb.properties = max8925_usb_props; | |
464 | info->usb.num_properties = ARRAY_SIZE(max8925_usb_props); | |
465 | info->usb.get_property = max8925_usb_get_prop; | |
466 | ret = power_supply_register(&pdev->dev, &info->usb); | |
467 | if (ret) | |
468 | goto out_usb; | |
469 | info->usb.dev->parent = &pdev->dev; | |
470 | ||
471 | info->battery.name = "max8925-battery"; | |
472 | info->battery.type = POWER_SUPPLY_TYPE_BATTERY; | |
473 | info->battery.properties = max8925_battery_props; | |
474 | info->battery.num_properties = ARRAY_SIZE(max8925_battery_props); | |
475 | info->battery.get_property = max8925_bat_get_prop; | |
476 | ret = power_supply_register(&pdev->dev, &info->battery); | |
477 | if (ret) | |
478 | goto out_battery; | |
479 | info->battery.dev->parent = &pdev->dev; | |
480 | ||
481 | info->batt_detect = pdata->batt_detect; | |
482 | info->topoff_threshold = pdata->topoff_threshold; | |
483 | info->fast_charge = pdata->fast_charge; | |
484 | info->set_charger = pdata->set_charger; | |
485 | dev_set_drvdata(&pdev->dev, info); | |
486 | platform_set_drvdata(pdev, info); | |
487 | ||
488 | max8925_init_charger(chip, info); | |
489 | return 0; | |
490 | out_battery: | |
491 | power_supply_unregister(&info->battery); | |
492 | out_usb: | |
493 | power_supply_unregister(&info->ac); | |
494 | out: | |
495 | kfree(info); | |
496 | return ret; | |
497 | } | |
498 | ||
499 | static __devexit int max8925_power_remove(struct platform_device *pdev) | |
500 | { | |
501 | struct max8925_power_info *info = platform_get_drvdata(pdev); | |
502 | ||
503 | if (info) { | |
504 | power_supply_unregister(&info->ac); | |
505 | power_supply_unregister(&info->usb); | |
506 | power_supply_unregister(&info->battery); | |
507 | max8925_deinit_charger(info); | |
508 | kfree(info); | |
509 | } | |
510 | return 0; | |
511 | } | |
512 | ||
513 | static struct platform_driver max8925_power_driver = { | |
514 | .probe = max8925_power_probe, | |
515 | .remove = __devexit_p(max8925_power_remove), | |
516 | .driver = { | |
517 | .name = "max8925-power", | |
518 | }, | |
519 | }; | |
520 | ||
521 | static int __init max8925_power_init(void) | |
522 | { | |
523 | return platform_driver_register(&max8925_power_driver); | |
524 | } | |
525 | module_init(max8925_power_init); | |
526 | ||
527 | static void __exit max8925_power_exit(void) | |
528 | { | |
529 | platform_driver_unregister(&max8925_power_driver); | |
530 | } | |
531 | module_exit(max8925_power_exit); | |
532 | ||
533 | MODULE_LICENSE("GPL"); | |
534 | MODULE_DESCRIPTION("Power supply driver for MAX8925"); | |
535 | MODULE_ALIAS("platform:max8925-power"); |