drivers/power/supply/ds2781_battery.c

Source file repositories/reference/linux-study-clean/drivers/power/supply/ds2781_battery.c

File Facts

System
Linux kernel
Corpus path
drivers/power/supply/ds2781_battery.c
Extension
.c
Size
19854 bytes
Lines
795
Domain
Driver Families
Bucket
drivers/power
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

struct ds2781_device_info {
	struct device *dev;
	struct power_supply *bat;
	struct power_supply_desc bat_desc;
	struct device *w1_dev;
};

enum current_types {
	CURRENT_NOW,
	CURRENT_AVG,
};

static const char model[] = "DS2781";
static const char manufacturer[] = "Maxim/Dallas";

static inline struct ds2781_device_info *
to_ds2781_device_info(struct power_supply *psy)
{
	return power_supply_get_drvdata(psy);
}

static inline int ds2781_battery_io(struct ds2781_device_info *dev_info,
	char *buf, int addr, size_t count, int io)
{
	return w1_ds2781_io(dev_info->w1_dev, buf, addr, count, io);
}

static int w1_ds2781_read(struct ds2781_device_info *dev_info, char *buf,
		int addr, size_t count)
{
	return ds2781_battery_io(dev_info, buf, addr, count, 0);
}

static inline int ds2781_read8(struct ds2781_device_info *dev_info, u8 *val,
	int addr)
{
	return ds2781_battery_io(dev_info, val, addr, sizeof(u8), 0);
}

static int ds2781_read16(struct ds2781_device_info *dev_info, s16 *val,
	int addr)
{
	int ret;
	u8 raw[2];

	ret = ds2781_battery_io(dev_info, raw, addr, sizeof(raw), 0);
	if (ret < 0)
		return ret;

	*val = (raw[0] << 8) | raw[1];

	return 0;
}

static inline int ds2781_read_block(struct ds2781_device_info *dev_info,
	u8 *val, int addr, size_t count)
{
	return ds2781_battery_io(dev_info, val, addr, count, 0);
}

static inline int ds2781_write(struct ds2781_device_info *dev_info, u8 *val,
	int addr, size_t count)
{
	return ds2781_battery_io(dev_info, val, addr, count, 1);
}

static inline int ds2781_store_eeprom(struct device *dev, int addr)
{
	return w1_ds2781_eeprom_cmd(dev, addr, W1_DS2781_COPY_DATA);
}

static inline int ds2781_recall_eeprom(struct device *dev, int addr)
{
	return w1_ds2781_eeprom_cmd(dev, addr, W1_DS2781_RECALL_DATA);
}

static int ds2781_save_eeprom(struct ds2781_device_info *dev_info, int reg)
{
	int ret;

	ret = ds2781_store_eeprom(dev_info->w1_dev, reg);
	if (ret < 0)
		return ret;

	ret = ds2781_recall_eeprom(dev_info->w1_dev, reg);
	if (ret < 0)
		return ret;

	return 0;
}

Annotation

Implementation Notes