drivers/acpi/dptf/dptf_power.c

Source file repositories/reference/linux-study-clean/drivers/acpi/dptf/dptf_power.c

File Facts

System
Linux kernel
Corpus path
drivers/acpi/dptf/dptf_power.c
Extension
.c
Size
6834 bytes
Lines
263
Domain
Driver Families
Bucket
drivers/acpi
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-only
/*
 * dptf_power:  DPTF platform power driver
 * Copyright (c) 2016, Intel Corporation.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/acpi.h>
#include <linux/platform_device.h>

/*
 * Presentation of attributes which are defined for INT3407 and INT3532.
 * They are:
 * PMAX : Maximum platform power
 * PSRC : Platform power source
 * ARTG : Adapter rating
 * CTYP : Charger type
 * PROP : Rest of worst case platform Power
 * PBSS : Power Battery Steady State
 * RBHF : High Frequency Impedance
 * VBNL : Instantaneous No-Load Voltage
 * CMPP : Current Discharge Capability
 */
#define DPTF_POWER_SHOW(name, object) \
static ssize_t name##_show(struct device *dev,\
			   struct device_attribute *attr,\
			   char *buf)\
{\
	struct acpi_device *acpi_dev = dev_get_drvdata(dev);\
	unsigned long long val;\
	acpi_status status;\
\
	status = acpi_evaluate_integer(acpi_dev->handle, #object,\
				       NULL, &val);\
	if (ACPI_SUCCESS(status))\
		return sprintf(buf, "%d\n", (int)val);\
	else \
		return -EINVAL;\
}

DPTF_POWER_SHOW(max_platform_power_mw, PMAX)
DPTF_POWER_SHOW(platform_power_source, PSRC)
DPTF_POWER_SHOW(adapter_rating_mw, ARTG)
DPTF_POWER_SHOW(battery_steady_power_mw, PBSS)
DPTF_POWER_SHOW(charger_type, CTYP)
DPTF_POWER_SHOW(rest_of_platform_power_mw, PROP)
DPTF_POWER_SHOW(max_steady_state_power_mw, PBSS)
DPTF_POWER_SHOW(high_freq_impedance_mohm, RBHF)
DPTF_POWER_SHOW(no_load_voltage_mv, VBNL)
DPTF_POWER_SHOW(current_discharge_capbility_ma, CMPP);

static DEVICE_ATTR_RO(max_platform_power_mw);
static DEVICE_ATTR_RO(platform_power_source);
static DEVICE_ATTR_RO(adapter_rating_mw);
static DEVICE_ATTR_RO(battery_steady_power_mw);
static DEVICE_ATTR_RO(charger_type);
static DEVICE_ATTR_RO(rest_of_platform_power_mw);
static DEVICE_ATTR_RO(max_steady_state_power_mw);
static DEVICE_ATTR_RO(high_freq_impedance_mohm);
static DEVICE_ATTR_RO(no_load_voltage_mv);
static DEVICE_ATTR_RO(current_discharge_capbility_ma);

static ssize_t prochot_confirm_store(struct device *dev,
				     struct device_attribute *attr,
				     const char *buf, size_t count)
{
	struct acpi_device *acpi_dev = dev_get_drvdata(dev);
	acpi_status status;
	int seq_no;

	if (kstrtouint(buf, 0, &seq_no) < 0)
		return -EINVAL;

	status = acpi_execute_simple_method(acpi_dev->handle, "PBOK", seq_no);
	if (ACPI_SUCCESS(status))
		return count;

	return -EINVAL;
}

static DEVICE_ATTR_WO(prochot_confirm);

static struct attribute *dptf_power_attrs[] = {
	&dev_attr_max_platform_power_mw.attr,
	&dev_attr_platform_power_source.attr,
	&dev_attr_adapter_rating_mw.attr,
	&dev_attr_battery_steady_power_mw.attr,
	&dev_attr_charger_type.attr,
	&dev_attr_rest_of_platform_power_mw.attr,

Annotation

Implementation Notes