i2c: Documentation: fix device matching description
The matching process described for new style clients in Documentation/i2c/writing-clients is classed as out-of-date as it requires the presence of an .id_table entry in the driver's i2c_driver entry. Signed-off-by: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Jean Delvare <khali@linux-fr.org>
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@ -25,12 +25,23 @@ routines, and should be zero-initialized except for fields with data you
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provide. A client structure holds device-specific information like the
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driver model device node, and its I2C address.
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/* iff driver uses driver model ("new style") binding model: */
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static struct i2c_device_id foo_idtable[] = {
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{ "foo", my_id_for_foo },
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{ "bar", my_id_for_bar },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, foo_idtable);
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static struct i2c_driver foo_driver = {
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.driver = {
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.name = "foo",
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},
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/* iff driver uses driver model ("new style") binding model: */
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.id_table = foo_ids,
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.probe = foo_probe,
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.remove = foo_remove,
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@ -173,10 +184,9 @@ handle may be used during foo_probe(). If foo_probe() reports success
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(zero not a negative status code) it may save the handle and use it until
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foo_remove() returns. That binding model is used by most Linux drivers.
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Drivers match devices when i2c_client.driver_name and the driver name are
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the same; this approach is used in several other busses that don't have
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device typing support in the hardware. The driver and module name should
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match, so hotplug/coldplug mechanisms will modprobe the driver.
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The probe function is called when an entry in the id_table name field
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matches the device's name. It is passed the entry that was matched so
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the driver knows which one in the table matched.
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Device Creation (Standard driver model)
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