drivers/hwmon/mc34vr500.c

Source file repositories/reference/linux-study-clean/drivers/hwmon/mc34vr500.c

File Facts

System
Linux kernel
Corpus path
drivers/hwmon/mc34vr500.c
Extension
.c
Size
6116 bytes
Lines
264
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 mc34vr500_data {
	struct device *hwmon_dev;
	struct regmap *regmap;
};

static irqreturn_t mc34vr500_process_interrupt(int irq, void *userdata)
{
	struct mc34vr500_data *data = (struct mc34vr500_data *)userdata;
	unsigned int reg;
	int ret;

	ret = regmap_read(data->regmap, MC34VR500_INTSTAT0, &reg);
	if (ret < 0)
		return IRQ_HANDLED;

	if (reg) {
		if (reg & LOWVINS_BIT)
			hwmon_notify_event(data->hwmon_dev, hwmon_in,
					   hwmon_in_min_alarm, 0);

		if (reg & THERM110S_BIT)
			hwmon_notify_event(data->hwmon_dev, hwmon_temp,
					   hwmon_temp_max_alarm, 0);

		if (reg & THERM120S_BIT)
			hwmon_notify_event(data->hwmon_dev, hwmon_temp,
					   hwmon_temp_crit_alarm, 0);

		if (reg & THERM130S_BIT)
			hwmon_notify_event(data->hwmon_dev, hwmon_temp,
					   hwmon_temp_emergency_alarm, 0);

		/* write 1 to clear */
		regmap_write(data->regmap, MC34VR500_INTSTAT0, LOWVINS_BIT |
			     THERM110S_BIT | THERM120S_BIT | THERM130S_BIT);
	}

	return IRQ_HANDLED;
}

static umode_t mc34vr500_is_visible(const void *data,
				    enum hwmon_sensor_types type,
				    u32 attr, int channel)
{
	switch (attr) {
	case hwmon_in_min_alarm:
	case hwmon_temp_max_alarm:
	case hwmon_temp_crit_alarm:
	case hwmon_temp_emergency_alarm:
		return 0444;
	default:
		break;
	}

	return 0;
}

static int mc34vr500_alarm_read(struct mc34vr500_data *data, int index,
				long *val)
{
	unsigned int reg;
	int ret;

	ret = regmap_read(data->regmap, MC34VR500_INTSENSE0, &reg);
	if (ret < 0)
		return ret;

	*val = !!(reg & index);

	return 0;
}

static int mc34vr500_read(struct device *dev, enum hwmon_sensor_types type,
			  u32 attr, int channel, long *val)
{
	struct mc34vr500_data *data = dev_get_drvdata(dev);

	switch (type) {
	case hwmon_in:
		switch (attr) {
		case hwmon_in_min_alarm:
			return mc34vr500_alarm_read(data, LOWVINS_BIT, val);
		default:
			return -EOPNOTSUPP;
		}
	case hwmon_temp:
		switch (attr) {
		case hwmon_temp_max_alarm:
			return mc34vr500_alarm_read(data, THERM110S_BIT, val);
		case hwmon_temp_crit_alarm:

Annotation

Implementation Notes