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Diffstat (limited to 'Documentation/w1')
| -rw-r--r-- | Documentation/w1/w1.generic | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/Documentation/w1/w1.generic b/Documentation/w1/w1.generic new file mode 100644 index 00000000000..eace3046a85 --- /dev/null +++ b/Documentation/w1/w1.generic @@ -0,0 +1,19 @@ +Any w1 device must be connected to w1 bus master device - for example +ds9490 usb device or w1-over-GPIO or RS232 converter. +Driver for w1 bus master must provide several functions(you can find +them in struct w1_bus_master definition in w1.h) which then will be +called by w1 core to send various commands over w1 bus(by default it is +reset and search commands). When some device is found on the bus, w1 core +checks if driver for it's family is loaded. +If driver is loaded w1 core creates new w1_slave object and registers it +in the system(creates some generic sysfs files(struct w1_family_ops in +w1_family.h), notifies any registered listener and so on...). +It is device driver's business to provide any communication method +upstream. +For example w1_therm driver(ds18?20 thermal sensor family driver) +provides temperature reading function which is bound to ->rbin() method +of the above w1_family_ops structure. +w1_smem - driver for simple 64bit memory cell provides ID reading +method. + +You can call above methods by reading appropriate sysfs files. |