drivers/hwmon/adm1026.c

Source file repositories/reference/linux-study-clean/drivers/hwmon/adm1026.c

File Facts

System
Linux kernel
Corpus path
drivers/hwmon/adm1026.c
Extension
.c
Size
60532 bytes
Lines
1882
Domain
Driver Families
Bucket
drivers/hwmon
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 pwm_data {
	u8 pwm;
	u8 enable;
	u8 auto_pwm_min;
};

struct adm1026_data {
	struct i2c_client *client;
	const struct attribute_group *groups[3];

	struct mutex update_lock;
	bool valid;		/* true if following fields are valid */
	unsigned long last_reading;	/* In jiffies */
	unsigned long last_config;	/* In jiffies */

	u8 in[17];		/* Register value */
	u8 in_max[17];		/* Register value */
	u8 in_min[17];		/* Register value */
	s8 temp[3];		/* Register value */
	s8 temp_min[3];		/* Register value */
	s8 temp_max[3];		/* Register value */
	s8 temp_tmin[3];	/* Register value */
	s8 temp_crit[3];	/* Register value */
	s8 temp_offset[3];	/* Register value */
	u8 fan[8];		/* Register value */
	u8 fan_min[8];		/* Register value */
	u8 fan_div[8];		/* Decoded value */
	struct pwm_data pwm1;	/* Pwm control values */
	u8 vrm;			/* VRM version */
	u8 analog_out;		/* Register value (DAC) */
	long alarms;		/* Register encoding, combined */
	long alarm_mask;	/* Register encoding, combined */
	long gpio;		/* Register encoding, combined */
	long gpio_mask;		/* Register encoding, combined */
	u8 gpio_config[17];	/* Decoded value */
	u8 config1;		/* Register value */
	u8 config2;		/* Register value */
	u8 config3;		/* Register value */
};

static int adm1026_read_value(struct i2c_client *client, u8 reg)
{
	int res;

	if (reg < 0x80) {
		/* "RAM" locations */
		res = i2c_smbus_read_byte_data(client, reg) & 0xff;
	} else {
		/* EEPROM, do nothing */
		res = 0;
	}
	return res;
}

static int adm1026_write_value(struct i2c_client *client, u8 reg, int value)
{
	int res;

	if (reg < 0x80) {
		/* "RAM" locations */
		res = i2c_smbus_write_byte_data(client, reg, value);
	} else {
		/* EEPROM, do nothing */
		res = 0;
	}
	return res;
}

static struct adm1026_data *adm1026_update_device(struct device *dev)
{
	struct adm1026_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	int i;
	long value, alarms, gpio;

	mutex_lock(&data->update_lock);
	if (!data->valid
	    || time_after(jiffies,
			  data->last_reading + ADM1026_DATA_INTERVAL)) {
		/* Things that change quickly */
		dev_dbg(&client->dev, "Reading sensor values\n");
		for (i = 0; i <= 16; ++i) {
			data->in[i] =
			    adm1026_read_value(client, ADM1026_REG_IN[i]);
		}

		for (i = 0; i <= 7; ++i) {
			data->fan[i] =
			    adm1026_read_value(client, ADM1026_REG_FAN(i));
		}

Annotation

Implementation Notes