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platform/x86/intel: bytcrc_pwrsrc: Optionally register a power_supply dev

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On some Android tablets with Crystal Cove PMIC the DSDT lacks an ACPI AC
device to indicate whether a charger is plugged in or not.

Add support for registering a "crystal_cove_pwrsrc" power_supply class
device to indicate charger online status. This is made conditional on
a "linux,register-pwrsrc-power_supply" boolean device-property to avoid
registering a duplicate power_supply class device on devices where this
is already handled by an ACPI AC device.

Note the "linux,register-pwrsrc-power_supply" property is only used on
x86/ACPI (non devicetree) devs and the devicetree-bindings maintainers
have requested properties like these to not be added to the devicetree
bindings, so the new property is deliberately not added to any bindings.

Reviewed-by: Andy Shevchenko <andy@kernel.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20241204193442.65374-2-hdegoede@redhat.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
This commit is contained in:
Hans de Goede 2024-12-04 20:34:41 +01:00 • committed by Ilpo Järvinen
parent c0f1bfc141
commit 0130ec83c5
No known key found for this signature in database
GPG key ID: 59AC4F6153E5CE31
1 changed files with 77 additions and 2 deletions
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79
drivers/platform/x86/intel/bytcrc_pwrsrc.c
View file

@ -8,13 +8,22 @@
* Copyright (C) 2013 Intel Corporation
*/
#include <linux/array_size.h>
#include <linux/bits.h>
#include <linux/debugfs.h>
#include <linux/interrupt.h>
#include <linux/mfd/intel_soc_pmic.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/property.h>
#include <linux/regmap.h>
#define CRYSTALCOVE_PWRSRC_IRQ 0x03
#define CRYSTALCOVE_SPWRSRC_REG 0x1E
#define CRYSTALCOVE_SPWRSRC_USB BIT(0)
#define CRYSTALCOVE_SPWRSRC_DC BIT(1)
#define CRYSTALCOVE_SPWRSRC_BATTERY BIT(2)
#define CRYSTALCOVE_RESETSRC0_REG 0x20
#define CRYSTALCOVE_RESETSRC1_REG 0x21
#define CRYSTALCOVE_WAKESRC_REG 0x22
@ -22,6 +31,7 @@
struct crc_pwrsrc_data {
struct regmap *regmap;
struct dentry *debug_dentry;
struct power_supply *psy;
unsigned int resetsrc0;
unsigned int resetsrc1;
unsigned int wakesrc;
@ -118,13 +128,60 @@ static int crc_pwrsrc_read_and_clear(struct crc_pwrsrc_data *data,
return regmap_write(data->regmap, reg, *val);
}
static irqreturn_t crc_pwrsrc_irq_handler(int irq, void *_data)
{
struct crc_pwrsrc_data *data = _data;
unsigned int irq_mask;
if (regmap_read(data->regmap, CRYSTALCOVE_PWRSRC_IRQ, &irq_mask))
return IRQ_NONE;
regmap_write(data->regmap, CRYSTALCOVE_PWRSRC_IRQ, irq_mask);
power_supply_changed(data->psy);
return IRQ_HANDLED;
}
static int crc_pwrsrc_psy_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct crc_pwrsrc_data *data = power_supply_get_drvdata(psy);
unsigned int pwrsrc;
int ret;
if (psp != POWER_SUPPLY_PROP_ONLINE)
return -EINVAL;
ret = regmap_read(data->regmap, CRYSTALCOVE_SPWRSRC_REG, &pwrsrc);
if (ret)
return ret;
val->intval = !!(pwrsrc & (CRYSTALCOVE_SPWRSRC_USB |
CRYSTALCOVE_SPWRSRC_DC));
return 0;
}
static const enum power_supply_property crc_pwrsrc_psy_props[] = {
POWER_SUPPLY_PROP_ONLINE,
};
static const struct power_supply_desc crc_pwrsrc_psy_desc = {
.name = "crystal_cove_pwrsrc",
.type = POWER_SUPPLY_TYPE_MAINS,
.properties = crc_pwrsrc_psy_props,
.num_properties = ARRAY_SIZE(crc_pwrsrc_psy_props),
.get_property = crc_pwrsrc_psy_get_property,
};
static int crc_pwrsrc_probe(struct platform_device *pdev)
{
struct intel_soc_pmic *pmic = dev_get_drvdata(pdev->dev.parent);
struct device *dev = &pdev->dev;
struct crc_pwrsrc_data *data;
int ret;
int irq, ret;
data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
@ -149,6 +206,24 @@ static int crc_pwrsrc_probe(struct platform_device *pdev)
if (ret)
return ret;
if (device_property_read_bool(dev->parent, "linux,register-pwrsrc-power_supply")) {
struct power_supply_config psy_cfg = { .drv_data = data };
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
data->psy = devm_power_supply_register(dev, &crc_pwrsrc_psy_desc, &psy_cfg);
if (IS_ERR(data->psy))
return dev_err_probe(dev, PTR_ERR(data->psy), "registering power-supply\n");
ret = devm_request_threaded_irq(dev, irq, NULL,
crc_pwrsrc_irq_handler,
IRQF_ONESHOT, KBUILD_MODNAME, data);
if (ret)
return dev_err_probe(dev, ret, "requesting IRQ\n");
}
data->debug_dentry = debugfs_create_dir(KBUILD_MODNAME, NULL);
debugfs_create_file("pwrsrc", 0444, data->debug_dentry, data, &pwrsrc_fops);
debugfs_create_file("resetsrc", 0444, data->debug_dentry, data, &resetsrc_fops);