Staging: comedi: adl_paci9118: organized entry comments
Introductory comments organized according to Linux's comment coding style. Signed-off-by: Sam Asadi <asadi.samuel@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -7,61 +7,62 @@
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*
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* Author: Michal Dobes <dobes@tesnet.cz>
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*
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*/
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*/
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/*
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Driver: adl_pci9118
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Description: Adlink PCI-9118DG, PCI-9118HG, PCI-9118HR
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Author: Michal Dobes <dobes@tesnet.cz>
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Devices: [ADLink] PCI-9118DG (pci9118dg), PCI-9118HG (pci9118hg),
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PCI-9118HR (pci9118hr)
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Status: works
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This driver supports AI, AO, DI and DO subdevices.
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AI subdevice supports cmd and insn interface,
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other subdevices support only insn interface.
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For AI:
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- If cmd->scan_begin_src=TRIG_EXT then trigger input is TGIN (pin 46).
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- If cmd->convert_src=TRIG_EXT then trigger input is EXTTRG (pin 44).
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- If cmd->start_src/stop_src=TRIG_EXT then trigger input is TGIN (pin 46).
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- It is not necessary to have cmd.scan_end_arg=cmd.chanlist_len but
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cmd.scan_end_arg modulo cmd.chanlist_len must by 0.
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- If return value of cmdtest is 5 then you've bad channel list
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(it isn't possible mixture S.E. and DIFF inputs or bipolar and unipolar
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ranges).
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There are some hardware limitations:
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a) You cann't use mixture of unipolar/bipoar ranges or differencial/single
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ended inputs.
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b) DMA transfers must have the length aligned to two samples (32 bit),
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so there is some problems if cmd->chanlist_len is odd. This driver tries
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bypass this with adding one sample to the end of the every scan and discard
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it on output but this cann't be used if cmd->scan_begin_src=TRIG_FOLLOW
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and is used flag TRIG_WAKE_EOS, then driver switch to interrupt driven mode
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with interrupt after every sample.
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c) If isn't used DMA then you can use only mode where
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cmd->scan_begin_src=TRIG_FOLLOW.
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Configuration options:
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[0] - PCI bus of device (optional)
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[1] - PCI slot of device (optional)
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If bus/slot is not specified, then first available PCI
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card will be used.
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[2] - 0= standard 8 DIFF/16 SE channels configuration
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n = external multiplexer connected, 1 <= n <= 256
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[3] - 0=autoselect DMA or EOC interrupts operation
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1 = disable DMA mode
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3 = disable DMA and INT, only insn interface will work
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[4] - sample&hold signal - card can generate signal for external S&H board
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0 = use SSHO(pin 45) signal is generated in onboard hardware S&H logic
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0 != use ADCHN7(pin 23) signal is generated from driver, number say how
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long delay is requested in ns and sign polarity of the hold
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(in this case external multiplexor can serve only 128 channels)
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[5] - 0=stop measure on all hardware errors
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2 | = ignore ADOR - A/D Overrun status
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8|=ignore Bover - A/D Burst Mode Overrun status
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256|=ignore nFull - A/D FIFO Full status
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*/
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* Driver: adl_pci9118
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* Description: Adlink PCI-9118DG, PCI-9118HG, PCI-9118HR
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* Author: Michal Dobes <dobes@tesnet.cz>
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* Devices: [ADLink] PCI-9118DG (pci9118dg), PCI-9118HG (pci9118hg),
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* PCI-9118HR (pci9118hr)
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* Status: works
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*
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* This driver supports AI, AO, DI and DO subdevices.
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* AI subdevice supports cmd and insn interface,
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* other subdevices support only insn interface.
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* For AI:
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* - If cmd->scan_begin_src=TRIG_EXT then trigger input is TGIN (pin 46).
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* - If cmd->convert_src=TRIG_EXT then trigger input is EXTTRG (pin 44).
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* - If cmd->start_src/stop_src=TRIG_EXT then trigger input is TGIN (pin 46).
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* - It is not necessary to have cmd.scan_end_arg=cmd.chanlist_len but
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* cmd.scan_end_arg modulo cmd.chanlist_len must by 0.
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* - If return value of cmdtest is 5 then you've bad channel list
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* (it isn't possible mixture S.E. and DIFF inputs or bipolar and unipolar
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* ranges).
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*
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* There are some hardware limitations:
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* a) You cann't use mixture of unipolar/bipoar ranges or differencial/single
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* ended inputs.
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* b) DMA transfers must have the length aligned to two samples (32 bit),
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* so there is some problems if cmd->chanlist_len is odd. This driver tries
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* bypass this with adding one sample to the end of the every scan and discard
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* it on output but this cann't be used if cmd->scan_begin_src=TRIG_FOLLOW
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* and is used flag TRIG_WAKE_EOS, then driver switch to interrupt driven mode
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* with interrupt after every sample.
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* c) If isn't used DMA then you can use only mode where
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* cmd->scan_begin_src=TRIG_FOLLOW.
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*
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* Configuration options:
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* [0] - PCI bus of device (optional)
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* [1] - PCI slot of device (optional)
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* If bus/slot is not specified, then first available PCI
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* card will be used.
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* [2] - 0= standard 8 DIFF/16 SE channels configuration
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* n = external multiplexer connected, 1 <= n <= 256
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* [3] - 0=autoselect DMA or EOC interrupts operation
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* 1 = disable DMA mode
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* 3 = disable DMA and INT, only insn interface will work
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* [4] - sample&hold signal - card can generate signal for external S&H board
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* 0 = use SSHO(pin 45) signal is generated in onboard hardware S&H logic
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* 0 != use ADCHN7(pin 23) signal is generated from driver, number say how
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* long delay is requested in ns and sign polarity of the hold
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* (in this case external multiplexor can serve only 128 channels)
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* [5] - 0=stop measure on all hardware errors
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* 2 | = ignore ADOR - A/D Overrun status
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* 8|=ignore Bover - A/D Burst Mode Overrun status
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* 256|=ignore nFull - A/D FIFO Full status
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*
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*/
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/*
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* FIXME
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