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-rw-r--r--Documentation/i2c/writing-clients35
1 files changed, 15 insertions, 20 deletions
diff --git a/Documentation/i2c/writing-clients b/Documentation/i2c/writing-clients
index 91664be91ff..e6b546dd4f7 100644
--- a/Documentation/i2c/writing-clients
+++ b/Documentation/i2c/writing-clients
@@ -195,31 +195,28 @@ Probing classes (sensors)
-------------------------
If you write a `sensors' driver, you use a slightly different interface.
-As well as I2C addresses, we have to cope with ISA addresses. Also, we
-use a enum of chip types. Don't forget to include `sensors.h'.
+Also, we use a enum of chip types. Don't forget to include `sensors.h'.
The following lists are used internally. They are all lists of integers.
- normal_i2c: filled in by the module writer. Terminated by SENSORS_I2C_END.
+ normal_i2c: filled in by the module writer. Terminated by I2C_CLIENT_END.
A list of I2C addresses which should normally be examined.
- normal_isa: filled in by the module writer. Terminated by SENSORS_ISA_END.
- A list of ISA addresses which should normally be examined.
- probe: insmod parameter. Initialize this list with SENSORS_I2C_END values.
- A list of pairs. The first value is a bus number (SENSORS_ISA_BUS for
- the ISA bus, -1 for any I2C bus), the second is the address. These
- addresses are also probed, as if they were in the 'normal' list.
- ignore: insmod parameter. Initialize this list with SENSORS_I2C_END values.
- A list of pairs. The first value is a bus number (SENSORS_ISA_BUS for
- the ISA bus, -1 for any I2C bus), the second is the I2C address. These
- addresses are never probed. This parameter overrules 'normal' and
- 'probe', but not the 'force' lists.
+ probe: insmod parameter. Initialize this list with I2C_CLIENT_END values.
+ A list of pairs. The first value is a bus number (ANY_I2C_BUS for any
+ I2C bus), the second is the address. These addresses are also probed,
+ as if they were in the 'normal' list.
+ ignore: insmod parameter. Initialize this list with I2C_CLIENT_END values.
+ A list of pairs. The first value is a bus number (ANY_I2C_BUS for any
+ I2C bus), the second is the I2C address. These addresses are never
+ probed. This parameter overrules 'normal' and 'probe', but not the
+ 'force' lists.
Also used is a list of pointers to sensors_force_data structures:
force_data: insmod parameters. A list, ending with an element of which
the force field is NULL.
Each element contains the type of chip and a list of pairs.
- The first value is a bus number (SENSORS_ISA_BUS for the ISA bus,
- -1 for any I2C bus), the second is the address.
+ The first value is a bus number (ANY_I2C_BUS for any I2C bus), the
+ second is the address.
These are automatically translated to insmod variables of the form
force_foo.
@@ -227,13 +224,11 @@ So we have a generic insmod variabled `force', and chip-specific variables
`force_CHIPNAME'.
Fortunately, as a module writer, you just have to define the `normal_i2c'
-and `normal_isa' parameters, and define what chip names are used.
-The complete declaration could look like this:
+parameter, and define what chip names are used. The complete declaration
+could look like this:
/* Scan i2c addresses 0x37, and 0x48 to 0x4f */
static unsigned short normal_i2c[] = { 0x37, 0x48, 0x49, 0x4a, 0x4b, 0x4c,
0x4d, 0x4e, 0x4f, I2C_CLIENT_END };
- /* Scan ISA address 0x290 */
- static unsigned int normal_isa[] = {0x0290,SENSORS_ISA_END};
/* Define chips foo and bar, as well as all module parameters and things */
SENSORS_INSMOD_2(foo,bar);