drivers/hwmon/gl520sm.c

Source file repositories/reference/linux-study-clean/drivers/hwmon/gl520sm.c

File Facts

System
Linux kernel
Corpus path
drivers/hwmon/gl520sm.c
Extension
.c
Size
25310 bytes
Lines
911
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 gl520_data {
	struct i2c_client *client;
	const struct attribute_group *groups[3];
	struct mutex update_lock;
	bool valid;		/* false until the following fields are valid */
	unsigned long last_updated;	/* in jiffies */

	u8 vid;
	u8 vrm;
	u8 in_input[5];		/* [0] = VVD */
	u8 in_min[5];		/* [0] = VDD */
	u8 in_max[5];		/* [0] = VDD */
	u8 fan_input[2];
	u8 fan_min[2];
	u8 fan_div[2];
	u8 fan_off;
	u8 temp_input[2];
	u8 temp_max[2];
	u8 temp_max_hyst[2];
	u8 alarms;
	u8 beep_enable;
	u8 beep_mask;
	u8 alarm_mask;
	u8 two_temps;
};

/*
 * Registers 0x07 to 0x0c are word-sized, others are byte-sized
 * GL520 uses a high-byte first convention
 */
static int gl520_read_value(struct i2c_client *client, u8 reg)
{
	if ((reg >= 0x07) && (reg <= 0x0c))
		return i2c_smbus_read_word_swapped(client, reg);
	else
		return i2c_smbus_read_byte_data(client, reg);
}

static int gl520_write_value(struct i2c_client *client, u8 reg, u16 value)
{
	if ((reg >= 0x07) && (reg <= 0x0c))
		return i2c_smbus_write_word_swapped(client, reg, value);
	else
		return i2c_smbus_write_byte_data(client, reg, value);
}

static struct gl520_data *gl520_update_device(struct device *dev)
{
	struct gl520_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	int val, i;

	mutex_lock(&data->update_lock);

	if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {

		dev_dbg(&client->dev, "Starting gl520sm update\n");

		data->alarms = gl520_read_value(client, GL520_REG_ALARMS);
		data->beep_mask = gl520_read_value(client, GL520_REG_BEEP_MASK);
		data->vid = gl520_read_value(client,
					     GL520_REG_VID_INPUT) & 0x1f;

		for (i = 0; i < 4; i++) {
			data->in_input[i] = gl520_read_value(client,
							GL520_REG_IN_INPUT[i]);
			val = gl520_read_value(client, GL520_REG_IN_LIMIT[i]);
			data->in_min[i] = val & 0xff;
			data->in_max[i] = (val >> 8) & 0xff;
		}

		val = gl520_read_value(client, GL520_REG_FAN_INPUT);
		data->fan_input[0] = (val >> 8) & 0xff;
		data->fan_input[1] = val & 0xff;

		val = gl520_read_value(client, GL520_REG_FAN_MIN);
		data->fan_min[0] = (val >> 8) & 0xff;
		data->fan_min[1] = val & 0xff;

		data->temp_input[0] = gl520_read_value(client,
						GL520_REG_TEMP_INPUT[0]);
		data->temp_max[0] = gl520_read_value(client,
						GL520_REG_TEMP_MAX[0]);
		data->temp_max_hyst[0] = gl520_read_value(client,
						GL520_REG_TEMP_MAX_HYST[0]);

		val = gl520_read_value(client, GL520_REG_FAN_DIV);
		data->fan_div[0] = (val >> 6) & 0x03;
		data->fan_div[1] = (val >> 4) & 0x03;
		data->fan_off = (val >> 2) & 0x01;

Annotation

Implementation Notes