arch/powerpc/platforms/powernv/opal-sensor.c

Source file repositories/reference/linux-study-clean/arch/powerpc/platforms/powernv/opal-sensor.c

File Facts

System
Linux kernel
Corpus path
arch/powerpc/platforms/powernv/opal-sensor.c
Extension
.c
Size
2649 bytes
Lines
133
Domain
Architecture Layer
Bucket
arch/powerpc
Inferred role
Architecture Layer: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

if (ret) {
			pr_err("%s: Failed to wait for the async response, %d\n",
			       __func__, ret);
			goto out;
		}

		ret = opal_error_code(opal_get_async_rc(msg));
		*sensor_data = be32_to_cpu(data);
		break;

	case OPAL_SUCCESS:
		ret = 0;
		*sensor_data = be32_to_cpu(data);
		break;

	case OPAL_WRONG_STATE:
		ret = -EIO;
		break;

	default:
		ret = opal_error_code(ret);
		break;
	}

out:
	opal_async_release_token(token);
	return ret;
}
EXPORT_SYMBOL_GPL(opal_get_sensor_data);

int opal_get_sensor_data_u64(u32 sensor_hndl, u64 *sensor_data)
{
	int ret, token;
	struct opal_msg msg;
	__be64 data;

	if (!opal_check_token(OPAL_SENSOR_READ_U64)) {
		u32 sdata;

		ret = opal_get_sensor_data(sensor_hndl, &sdata);
		if (!ret)
			*sensor_data = sdata;
		return ret;
	}

	token = opal_async_get_token_interruptible();
	if (token < 0)
		return token;

	ret = opal_sensor_read_u64(sensor_hndl, token, &data);
	switch (ret) {
	case OPAL_ASYNC_COMPLETION:
		ret = opal_async_wait_response(token, &msg);
		if (ret) {
			pr_err("%s: Failed to wait for the async response, %d\n",
			       __func__, ret);
			goto out_token;
		}

		ret = opal_error_code(opal_get_async_rc(msg));
		*sensor_data = be64_to_cpu(data);
		break;

	case OPAL_SUCCESS:
		ret = 0;
		*sensor_data = be64_to_cpu(data);
		break;

	case OPAL_WRONG_STATE:
		ret = -EIO;
		break;

	default:
		ret = opal_error_code(ret);
		break;
	}

out_token:
	opal_async_release_token(token);
	return ret;
}
EXPORT_SYMBOL_GPL(opal_get_sensor_data_u64);

int __init opal_sensor_init(void)
{
	struct platform_device *pdev;
	struct device_node *sensor;

	sensor = of_find_node_by_path("/ibm,opal/sensors");
	if (!sensor) {

Annotation

Implementation Notes