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WSL2-Linux-Kernel/drivers/power/supply/bd70528-charger.c

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20 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
//
// Copyright (C) 2018 ROHM Semiconductors
//
// power-supply driver for ROHM BD70528 PMIC
/*
* BD70528 charger HW state machine.
*
* The thermal shutdown state is not drawn. From any other state but
* battery error and suspend it is possible to go to TSD/TMP states
* if temperature is out of bounds.
*
* CHG_RST = H
* or CHG_EN=L
* or (DCIN2_UVLO=L && DCIN1_UVLO=L)
* or (DCIN2_OVLO=H & DCIN1_UVKLO=L)
*
* +--------------+ +--------------+
* | | | |
* | Any state +-------> | Suspend |
* | | | |
* +--------------+ +------+-------+
* |
* CHG_EN = H && BAT_DET = H && |
* No errors (temp, bat_ov, UVLO, |
* OVLO...) |
* |
* BAT_OV or +---------v----------+
* (DBAT && TTRI) | |
* +-----------------+ Trickle Charge | <---------------+
* | | | |
* | +-------+------------+ |
* | | |
* | | ^ |
* | V_BAT > VTRI_TH | | VBAT < VTRI_TH - 50mV |
* | | | |
* | v | |
* | | |
* | BAT_OV or +----------+----+ |
* | (DBAT && TFST) | | |
* | +----------------+ Fast Charge | |
* | | | | |
* v v +----+----------+ |
* | |
*+----------------+ ILIM_DET=L | ^ ILIM_DET |
*| | & CV_DET=H | | or CV_DET=L |
*| Battery Error | & VBAT > | | or VBAT < VRECHG_TH |
*| | VRECHG_TH | | or IBAT > IFST/x |
*+----------------+ & IBAT < | | |
* IFST/x v | |
* ^ | |
* | +---------+-+ |
* | | | |
* +-------------------+ Top OFF | |
* BAT_OV = H or | | |
* (DBAT && TFST) +-----+-----+ |
* | |
* Stay top-off for 15s | |
* v |
* |
* +--------+ |
* | | |
* | Done +-------------------------+
* | |
* +--------+ VBAT < VRECHG_TH
*/
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/mfd/rohm-bd70528.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#define CHG_STAT_SUSPEND 0x0
#define CHG_STAT_TRICKLE 0x1
#define CHG_STAT_FAST 0x3
#define CHG_STAT_TOPOFF 0xe
#define CHG_STAT_DONE 0xf
#define CHG_STAT_OTP_TRICKLE 0x10
#define CHG_STAT_OTP_FAST 0x11
#define CHG_STAT_OTP_DONE 0x12
#define CHG_STAT_TSD_TRICKLE 0x20
#define CHG_STAT_TSD_FAST 0x21
#define CHG_STAT_TSD_TOPOFF 0x22
#define CHG_STAT_BAT_ERR 0x7f
static const char *bd70528_charger_model = "BD70528";
static const char *bd70528_charger_manufacturer = "ROHM Semiconductors";
#define BD_ERR_IRQ_HND(_name_, _wrn_) \
static irqreturn_t bd0528_##_name_##_interrupt(int irq, void *arg) \
{ \
struct power_supply *psy = (struct power_supply *)arg; \
\
power_supply_changed(psy); \
dev_err(&psy->dev, (_wrn_)); \
\
return IRQ_HANDLED; \
}
#define BD_INFO_IRQ_HND(_name_, _wrn_) \
static irqreturn_t bd0528_##_name_##_interrupt(int irq, void *arg) \
{ \
struct power_supply *psy = (struct power_supply *)arg; \
\
power_supply_changed(psy); \
dev_dbg(&psy->dev, (_wrn_)); \
\
return IRQ_HANDLED; \
}
#define BD_IRQ_HND(_name_) bd0528_##_name_##_interrupt
struct bd70528_psy {
struct regmap *regmap;
struct device *dev;
struct power_supply *psy;
};
BD_ERR_IRQ_HND(BAT_OV_DET, "Battery overvoltage detected\n");
BD_ERR_IRQ_HND(DBAT_DET, "Dead battery detected\n");
BD_ERR_IRQ_HND(COLD_DET, "Battery cold\n");
BD_ERR_IRQ_HND(HOT_DET, "Battery hot\n");
BD_ERR_IRQ_HND(CHG_TSD, "Charger thermal shutdown\n");
BD_ERR_IRQ_HND(DCIN2_OV_DET, "DCIN2 overvoltage detected\n");
BD_INFO_IRQ_HND(BAT_OV_RES, "Battery voltage back to normal\n");
BD_INFO_IRQ_HND(COLD_RES, "Battery temperature back to normal\n");
BD_INFO_IRQ_HND(HOT_RES, "Battery temperature back to normal\n");
BD_INFO_IRQ_HND(BAT_RMV, "Battery removed\n");
BD_INFO_IRQ_HND(BAT_DET, "Battery detected\n");
BD_INFO_IRQ_HND(DCIN2_OV_RES, "DCIN2 voltage back to normal\n");
BD_INFO_IRQ_HND(DCIN2_RMV, "DCIN2 removed\n");
BD_INFO_IRQ_HND(DCIN2_DET, "DCIN2 detected\n");
BD_INFO_IRQ_HND(DCIN1_RMV, "DCIN1 removed\n");
BD_INFO_IRQ_HND(DCIN1_DET, "DCIN1 detected\n");
struct irq_name_pair {
const char *n;
irqreturn_t (*h)(int irq, void *arg);
};
static int bd70528_get_irqs(struct platform_device *pdev,
struct bd70528_psy *bdpsy)
{
int irq, i, ret;
unsigned int mask;
static const struct irq_name_pair bd70528_chg_irqs[] = {
{ .n = "bd70528-bat-ov-res", .h = BD_IRQ_HND(BAT_OV_RES) },
{ .n = "bd70528-bat-ov-det", .h = BD_IRQ_HND(BAT_OV_DET) },
{ .n = "bd70528-bat-dead", .h = BD_IRQ_HND(DBAT_DET) },
{ .n = "bd70528-bat-warmed", .h = BD_IRQ_HND(COLD_RES) },
{ .n = "bd70528-bat-cold", .h = BD_IRQ_HND(COLD_DET) },
{ .n = "bd70528-bat-cooled", .h = BD_IRQ_HND(HOT_RES) },
{ .n = "bd70528-bat-hot", .h = BD_IRQ_HND(HOT_DET) },
{ .n = "bd70528-chg-tshd", .h = BD_IRQ_HND(CHG_TSD) },
{ .n = "bd70528-bat-removed", .h = BD_IRQ_HND(BAT_RMV) },
{ .n = "bd70528-bat-detected", .h = BD_IRQ_HND(BAT_DET) },
{ .n = "bd70528-dcin2-ov-res", .h = BD_IRQ_HND(DCIN2_OV_RES) },
{ .n = "bd70528-dcin2-ov-det", .h = BD_IRQ_HND(DCIN2_OV_DET) },
{ .n = "bd70528-dcin2-removed", .h = BD_IRQ_HND(DCIN2_RMV) },
{ .n = "bd70528-dcin2-detected", .h = BD_IRQ_HND(DCIN2_DET) },
{ .n = "bd70528-dcin1-removed", .h = BD_IRQ_HND(DCIN1_RMV) },
{ .n = "bd70528-dcin1-detected", .h = BD_IRQ_HND(DCIN1_DET) },
};
for (i = 0; i < ARRAY_SIZE(bd70528_chg_irqs); i++) {
irq = platform_get_irq_byname(pdev, bd70528_chg_irqs[i].n);
if (irq < 0) {
dev_err(&pdev->dev, "Bad IRQ information for %s (%d)\n",
bd70528_chg_irqs[i].n, irq);
return irq;
}
ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
bd70528_chg_irqs[i].h,
IRQF_ONESHOT,
bd70528_chg_irqs[i].n,
bdpsy->psy);
if (ret)
return ret;
}
/*
* BD70528 irq controller is not touching the main mask register.
* So enable the charger block interrupts at main level. We can just
* leave them enabled as irq-controller should disable irqs
* from sub-registers when IRQ is disabled or freed.
*/
mask = BD70528_REG_INT_BAT1_MASK | BD70528_REG_INT_BAT2_MASK;
ret = regmap_update_bits(bdpsy->regmap,
BD70528_REG_INT_MAIN_MASK, mask, 0);
if (ret)
dev_err(&pdev->dev, "Failed to enable charger IRQs\n");
return ret;
}
static int bd70528_get_charger_status(struct bd70528_psy *bdpsy, int *val)
{
int ret;
unsigned int v;
ret = regmap_read(bdpsy->regmap, BD70528_REG_CHG_CURR_STAT, &v);
if (ret) {
dev_err(bdpsy->dev, "Charger state read failure %d\n",
ret);
return ret;
}
switch (v & BD70528_MASK_CHG_STAT) {
case CHG_STAT_SUSPEND:
/* Maybe we should check the CHG_TTRI_EN? */
case CHG_STAT_OTP_TRICKLE:
case CHG_STAT_OTP_FAST:
case CHG_STAT_OTP_DONE:
case CHG_STAT_TSD_TRICKLE:
case CHG_STAT_TSD_FAST:
case CHG_STAT_TSD_TOPOFF:
case CHG_STAT_BAT_ERR:
*val = POWER_SUPPLY_STATUS_NOT_CHARGING;
break;
case CHG_STAT_DONE:
*val = POWER_SUPPLY_STATUS_FULL;
break;
case CHG_STAT_TRICKLE:
case CHG_STAT_FAST:
case CHG_STAT_TOPOFF:
*val = POWER_SUPPLY_STATUS_CHARGING;
break;
default:
*val = POWER_SUPPLY_STATUS_UNKNOWN;
break;
}
return 0;
}
static int bd70528_get_charge_type(struct bd70528_psy *bdpsy, int *val)
{
int ret;
unsigned int v;
ret = regmap_read(bdpsy->regmap, BD70528_REG_CHG_CURR_STAT, &v);
if (ret) {
dev_err(bdpsy->dev, "Charger state read failure %d\n",
ret);
return ret;
}
switch (v & BD70528_MASK_CHG_STAT) {
case CHG_STAT_TRICKLE:
*val = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
break;
case CHG_STAT_FAST:
case CHG_STAT_TOPOFF:
*val = POWER_SUPPLY_CHARGE_TYPE_FAST;
break;
case CHG_STAT_DONE:
case CHG_STAT_SUSPEND:
/* Maybe we should check the CHG_TTRI_EN? */
case CHG_STAT_OTP_TRICKLE:
case CHG_STAT_OTP_FAST:
case CHG_STAT_OTP_DONE:
case CHG_STAT_TSD_TRICKLE:
case CHG_STAT_TSD_FAST:
case CHG_STAT_TSD_TOPOFF:
case CHG_STAT_BAT_ERR:
*val = POWER_SUPPLY_CHARGE_TYPE_NONE;
break;
default:
*val = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
break;
}
return 0;
}
static int bd70528_get_battery_health(struct bd70528_psy *bdpsy, int *val)
{
int ret;
unsigned int v;
ret = regmap_read(bdpsy->regmap, BD70528_REG_CHG_BAT_STAT, &v);
if (ret) {
dev_err(bdpsy->dev, "Battery state read failure %d\n",
ret);
return ret;
}
/* No battery? */
if (!(v & BD70528_MASK_CHG_BAT_DETECT))
*val = POWER_SUPPLY_HEALTH_DEAD;
else if (v & BD70528_MASK_CHG_BAT_OVERVOLT)
*val = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
else if (v & BD70528_MASK_CHG_BAT_TIMER)
*val = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
else
*val = POWER_SUPPLY_HEALTH_GOOD;
return 0;
}
static int bd70528_get_online(struct bd70528_psy *bdpsy, int *val)
{
int ret;
unsigned int v;
ret = regmap_read(bdpsy->regmap, BD70528_REG_CHG_IN_STAT, &v);
if (ret) {
dev_err(bdpsy->dev, "DC1 IN state read failure %d\n",
ret);
return ret;
}
*val = (v & BD70528_MASK_CHG_DCIN1_UVLO) ? 1 : 0;
return 0;
}
static int bd70528_get_present(struct bd70528_psy *bdpsy, int *val)
{
int ret;
unsigned int v;
ret = regmap_read(bdpsy->regmap, BD70528_REG_CHG_BAT_STAT, &v);
if (ret) {
dev_err(bdpsy->dev, "Battery state read failure %d\n",
ret);
return ret;
}
*val = (v & BD70528_MASK_CHG_BAT_DETECT) ? 1 : 0;
return 0;
}
struct linear_range {
int min;
int step;
int vals;
int low_sel;
};
static const struct linear_range current_limit_ranges[] = {
{
.min = 5,
.step = 1,
.vals = 36,
.low_sel = 0,
},
{
.min = 40,
.step = 5,
.vals = 5,
.low_sel = 0x23,
},
{
.min = 60,
.step = 20,
.vals = 8,
.low_sel = 0x27,
},
{
.min = 200,
.step = 50,
.vals = 7,
.low_sel = 0x2e,
}
};
/*
* BD70528 would support setting and getting own charge current/
* voltage for low temperatures. The driver currently only reads
* the charge current at room temperature. We do set both though.
*/
static const struct linear_range warm_charge_curr[] = {
{
.min = 10,
.step = 10,
.vals = 20,
.low_sel = 0,
},
{
.min = 200,
.step = 25,
.vals = 13,
.low_sel = 0x13,
},
};
/*
* Cold charge current selectors are identical to warm charge current
* selectors. The difference is that only smaller currents are available
* at cold charge range.
*/
#define MAX_COLD_CHG_CURR_SEL 0x15
#define MAX_WARM_CHG_CURR_SEL 0x1f
#define MIN_CHG_CURR_SEL 0x0
static int find_value_for_selector_low(const struct linear_range *r,
int selectors, unsigned int sel,
unsigned int *val)
{
int i;
for (i = 0; i < selectors; i++) {
if (r[i].low_sel <= sel && r[i].low_sel + r[i].vals >= sel) {
*val = r[i].min + (sel - r[i].low_sel) * r[i].step;
return 0;
}
}
return -EINVAL;
}
/*
* For BD70528 voltage/current limits we happily accept any value which
* belongs the range. We could check if value matching the selector is
* desired by computing the range min + (sel - sel_low) * range step - but
* I guess it is enough if we use voltage/current which is closest (below)
* the requested?
*/
static int find_selector_for_value_low(const struct linear_range *r,
int selectors, unsigned int val,
unsigned int *sel, bool *found)
{
int i;
int ret = -EINVAL;
*found = false;
for (i = 0; i < selectors; i++) {
if (r[i].min <= val) {
if (r[i].min + r[i].step * r[i].vals >= val) {
*found = true;
*sel = r[i].low_sel + (val - r[i].min) /
r[i].step;
ret = 0;
break;
}
/*
* If the range max is smaller than requested
* we can set the max supported value from range
*/
*sel = r[i].low_sel + r[i].vals;
ret = 0;
}
}
return ret;
}
static int get_charge_current(struct bd70528_psy *bdpsy, int *ma)
{
unsigned int sel;
int ret;
ret = regmap_read(bdpsy->regmap, BD70528_REG_CHG_CHG_CURR_WARM,
&sel);
if (ret) {
dev_err(bdpsy->dev,
"Charge current reading failed (%d)\n", ret);
return ret;
}
sel &= BD70528_MASK_CHG_CHG_CURR;
ret = find_value_for_selector_low(&warm_charge_curr[0],
ARRAY_SIZE(warm_charge_curr), sel,
ma);
if (ret) {
dev_err(bdpsy->dev,
"Unknown charge current value 0x%x\n",
sel);
}
return ret;
}
static int get_current_limit(struct bd70528_psy *bdpsy, int *ma)
{
unsigned int sel;
int ret;
ret = regmap_read(bdpsy->regmap, BD70528_REG_CHG_DCIN_ILIM,
&sel);
if (ret) {
dev_err(bdpsy->dev,
"Input current limit reading failed (%d)\n", ret);
return ret;
}
sel &= BD70528_MASK_CHG_DCIN_ILIM;
ret = find_value_for_selector_low(&current_limit_ranges[0],
ARRAY_SIZE(current_limit_ranges), sel,
ma);
if (ret) {
/* Unspecified values mean 500 mA */
*ma = 500;
}
return 0;
}
static enum power_supply_property bd70528_charger_props[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_CHARGE_TYPE,
POWER_SUPPLY_PROP_HEALTH,
POWER_SUPPLY_PROP_PRESENT,
POWER_SUPPLY_PROP_ONLINE,
POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
POWER_SUPPLY_PROP_MODEL_NAME,
POWER_SUPPLY_PROP_MANUFACTURER,
};
static int bd70528_charger_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct bd70528_psy *bdpsy = power_supply_get_drvdata(psy);
int ret = 0;
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
return bd70528_get_charger_status(bdpsy, &val->intval);
case POWER_SUPPLY_PROP_CHARGE_TYPE:
return bd70528_get_charge_type(bdpsy, &val->intval);
case POWER_SUPPLY_PROP_HEALTH:
return bd70528_get_battery_health(bdpsy, &val->intval);
case POWER_SUPPLY_PROP_PRESENT:
return bd70528_get_present(bdpsy, &val->intval);
case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
ret = get_current_limit(bdpsy, &val->intval);
val->intval *= 1000;
return ret;
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
ret = get_charge_current(bdpsy, &val->intval);
val->intval *= 1000;
return ret;
case POWER_SUPPLY_PROP_ONLINE:
return bd70528_get_online(bdpsy, &val->intval);
case POWER_SUPPLY_PROP_MODEL_NAME:
val->strval = bd70528_charger_model;
return 0;
case POWER_SUPPLY_PROP_MANUFACTURER:
val->strval = bd70528_charger_manufacturer;
return 0;
default:
break;
}
return -EINVAL;
}
static int bd70528_prop_is_writable(struct power_supply *psy,
enum power_supply_property psp)
{
switch (psp) {
case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
return 1;
default:
break;
}
return 0;
}
static int set_charge_current(struct bd70528_psy *bdpsy, int ma)
{
unsigned int reg;
int ret = 0, tmpret;
bool found;
if (ma > 500) {
dev_warn(bdpsy->dev,
"Requested charge current %u exceed maximum (500mA)\n",
ma);
reg = MAX_WARM_CHG_CURR_SEL;
goto set;
}
if (ma < 10) {
dev_err(bdpsy->dev,
"Requested charge current %u smaller than min (10mA)\n",
ma);
reg = MIN_CHG_CURR_SEL;
ret = -EINVAL;
goto set;
}
ret = find_selector_for_value_low(&warm_charge_curr[0],
ARRAY_SIZE(warm_charge_curr), ma,
&reg, &found);
if (ret) {
reg = MIN_CHG_CURR_SEL;
goto set;
}
if (!found) {
/* There was a gap in supported values and we hit it */
dev_warn(bdpsy->dev,
"Unsupported charge current %u mA\n", ma);
}
set:
tmpret = regmap_update_bits(bdpsy->regmap,
BD70528_REG_CHG_CHG_CURR_WARM,
BD70528_MASK_CHG_CHG_CURR, reg);
if (tmpret)
dev_err(bdpsy->dev,
"Charge current write failure (%d)\n", tmpret);
if (reg > MAX_COLD_CHG_CURR_SEL)
reg = MAX_COLD_CHG_CURR_SEL;
if (!tmpret)
tmpret = regmap_update_bits(bdpsy->regmap,
BD70528_REG_CHG_CHG_CURR_COLD,
BD70528_MASK_CHG_CHG_CURR, reg);
if (!ret)
ret = tmpret;
return ret;
}
#define MAX_CURR_LIMIT_SEL 0x34
#define MIN_CURR_LIMIT_SEL 0x0
static int set_current_limit(struct bd70528_psy *bdpsy, int ma)
{
unsigned int reg;
int ret = 0, tmpret;
bool found;
if (ma > 500) {
dev_warn(bdpsy->dev,
"Requested current limit %u exceed maximum (500mA)\n",
ma);
reg = MAX_CURR_LIMIT_SEL;
goto set;
}
if (ma < 5) {
dev_err(bdpsy->dev,
"Requested current limit %u smaller than min (5mA)\n",
ma);
reg = MIN_CURR_LIMIT_SEL;
ret = -EINVAL;
goto set;
}
ret = find_selector_for_value_low(&current_limit_ranges[0],
ARRAY_SIZE(current_limit_ranges), ma,
&reg, &found);
if (ret) {
reg = MIN_CURR_LIMIT_SEL;
goto set;
}
if (!found) {
/* There was a gap in supported values and we hit it ?*/
dev_warn(bdpsy->dev, "Unsupported current limit %umA\n",
ma);
}
set:
tmpret = regmap_update_bits(bdpsy->regmap,
BD70528_REG_CHG_DCIN_ILIM,
BD70528_MASK_CHG_DCIN_ILIM, reg);
if (!ret)
ret = tmpret;
return ret;
}
static int bd70528_charger_set_property(struct power_supply *psy,
enum power_supply_property psp,
const union power_supply_propval *val)
{
struct bd70528_psy *bdpsy = power_supply_get_drvdata(psy);
switch (psp) {
case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
return set_current_limit(bdpsy, val->intval / 1000);
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
return set_charge_current(bdpsy, val->intval / 1000);
default:
break;
}
return -EINVAL;
}
static const struct power_supply_desc bd70528_charger_desc = {
.name = "bd70528-charger",
.type = POWER_SUPPLY_TYPE_MAINS,
.properties = bd70528_charger_props,
.num_properties = ARRAY_SIZE(bd70528_charger_props),
.get_property = bd70528_charger_get_property,
.set_property = bd70528_charger_set_property,
.property_is_writeable = bd70528_prop_is_writable,
};
static int bd70528_power_probe(struct platform_device *pdev)
{
struct bd70528_psy *bdpsy;
struct power_supply_config cfg = {};
bdpsy = devm_kzalloc(&pdev->dev, sizeof(*bdpsy), GFP_KERNEL);
if (!bdpsy)
return -ENOMEM;
bdpsy->regmap = dev_get_regmap(pdev->dev.parent, NULL);
if (!bdpsy->regmap) {
dev_err(&pdev->dev, "No regmap found for chip\n");
return -EINVAL;
}
bdpsy->dev = &pdev->dev;
platform_set_drvdata(pdev, bdpsy);
cfg.drv_data = bdpsy;
cfg.of_node = pdev->dev.parent->of_node;
bdpsy->psy = devm_power_supply_register(&pdev->dev,
&bd70528_charger_desc, &cfg);
if (IS_ERR(bdpsy->psy)) {
dev_err(&pdev->dev, "failed: power supply register\n");
return PTR_ERR(bdpsy->psy);
}
return bd70528_get_irqs(pdev, bdpsy);
}
static struct platform_driver bd70528_power = {
.driver = {
.name = "bd70528-power"
},
.probe = bd70528_power_probe,
};
module_platform_driver(bd70528_power);
MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
MODULE_DESCRIPTION("BD70528 power-supply driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:bd70528-power");
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