Hi everybody,
I wrote some drivers for an embedded box. In one of these drivers I need the current system temperature.
My system works with the jc42.c driver and I can read the temperature perfectly via the proc filesystem in user space.
How do I query the temperature from another kernel driver?
First of all I added a new function and exported the symbol
int jc42_get_temperature()
{
int temp;
// TODO get the correct temp
temp = jc42_read_value(my_local_client, JC42_REG_TEMP);
return temp;
}
EXPORT_SYMBOL(jc42_get_temperature);
BUT: how do I get the temp? Most of the internal functions require a struct device or a struct i2c_client, which - I assume - are perfectly provided by the kernel when going the way over the proc file system.
I tried to statically save such a struct during the probing process (this is the above my_local_client), but this works neither. When I use the saved struct to call jc42_read_value, I always get a temperature value which is not correct at all.
Kernel is 2.6.29.6-rt24 (yes, jc42 is originally not included there - we ported it from a newer kernel release.)
Thanks for any help!
Matthias
--
To unsubscribe from this list: send the line "unsubscribe linux-embedded" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
