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author | Ian Abbott <abbotti@mev.co.uk> | 2012-11-14 11:22:55 (GMT) |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-11-15 00:25:08 (GMT) |
commit | 206cb10816d3b1ee38761b387106973df52c4315 (patch) | |
tree | 68857d46b1c586b2b9ef0806472ff831ce1ddeb0 | |
parent | b0a2b6d8ac9ce5d27c9086a196d8f44194561979 (diff) | |
download | linux-fsl-qoriq-206cb10816d3b1ee38761b387106973df52c4315.tar.xz |
staging: comedi: define operations for INSN_CONFIG_DIGITAL_TRIG
The 'addi_apci_1032' driver recently started supporting the
`INSN_CONFIG_DIGITAL_TRIG` configuration instruction, but as no other
drivers were using it before, there was no existing practice of how the
instruction should look.
Define the format to be something a bit more configurable. In
particular, a subdevice might have more than one trigger requiring an ID
and/or `COMEDI_EV_...` flags to disambiguate them, a trigger might have
more than 32 inputs, and a trigger might need several
`INSN_CONFIG_DIGITAL_TRIG` configuration instructions to configure
completely (if there are more than 32 inputs or if it uses a combination
of edge-triggered and level-triggered inputs).
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r-- | drivers/staging/comedi/comedi.h | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/drivers/staging/comedi/comedi.h b/drivers/staging/comedi/comedi.h index 3cbd2cd..c8a8ca1 100644 --- a/drivers/staging/comedi/comedi.h +++ b/drivers/staging/comedi/comedi.h @@ -283,6 +283,44 @@ enum configuration_ids { INSN_CONFIG_PWM_GET_H_BRIDGE = 5004 }; +/* + * Settings for INSN_CONFIG_DIGITAL_TRIG: + * data[0] = INSN_CONFIG_DIGITAL_TRIG + * data[1] = trigger ID + * data[2] = configuration operation + * data[3] = configuration parameter 1 + * data[4] = configuration parameter 2 + * data[5] = configuration parameter 3 + * + * operation parameter 1 parameter 2 parameter 3 + * --------------------------------- ----------- ----------- ----------- + * COMEDI_DIGITAL_TRIG_DISABLE + * COMEDI_DIGITAL_TRIG_ENABLE_EDGES left-shift rising-edges falling-edges + * COMEDI_DIGITAL_TRIG_ENABLE_LEVELS left-shift high-levels low-levels + * + * COMEDI_DIGITAL_TRIG_DISABLE returns the trigger to its default, inactive, + * unconfigured state. + * + * COMEDI_DIGITAL_TRIG_ENABLE_EDGES sets the rising and/or falling edge inputs + * that each can fire the trigger. + * + * COMEDI_DIGITAL_TRIG_ENABLE_LEVELS sets a combination of high and/or low + * level inputs that can fire the trigger. + * + * "left-shift" is useful if the trigger has more than 32 inputs to specify the + * first input for this configuration. + * + * Some sequences of INSN_CONFIG_DIGITAL_TRIG instructions may have a (partly) + * accumulative effect, depending on the low-level driver. This is useful + * when setting up a trigger that has more than 32 inputs or has a combination + * of edge and level triggered inputs. + */ +enum comedi_digital_trig_op { + COMEDI_DIGITAL_TRIG_DISABLE = 0, + COMEDI_DIGITAL_TRIG_ENABLE_EDGES = 1, + COMEDI_DIGITAL_TRIG_ENABLE_LEVELS = 2 +}; + enum comedi_io_direction { COMEDI_INPUT = 0, COMEDI_OUTPUT = 1, |