Comedi's read and write file operation handlers (`comedi_read()` and
`comedi_write()`) currently call `copy_to_user()` or `copy_from_user()`
whilst in the `TASK_INTERRUPTIBLE` state, which falls foul of the
`might_fault()` checks when enabled. Fix it by setting the current task
state back to `TASK_RUNNING` a bit earlier before calling these
functions.
Reported-by: Piotr Gregor <piotrgregor@rsyncme.org>
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Cc: <stable@vger.kernel.org> # 4.5+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
As reported by Éric Piel on the Comedi mailing list (see
<https://groups.google.com/forum/#!topic/comedi_list/ueZiR7vTLOU/discussion>),
the analog output asynchronous commands are running too fast with a
period 50 ns shorter than it should be. This affects all boards with AO
command support that are supported by the "ni_pcimio", "ni_atmio", and
"ni_mio_cs" drivers.
This is a regression bug introduced by commit 080e6795cb ("staging:
comedi: ni_mio_common: Cleans up/clarifies ni_ao_cmd"), specifically,
this line in `ni_ao_cmd_set_update()`:
/* following line: N-1 per STC */
ni_stc_writel(dev, trigvar - 1, NISTC_AO_UI_LOADA_REG);
The `trigvar` variable value comes from a call to `ni_ns_to_timer()`
which converts a timer period in nanoseconds to a hardware divisor
value. The function already reduces the divisor by 1 as required by the
hardware, so the above line should not reduce it further by 1. Fix it
by replacing `trigvar` by `trigvar - 1` in the above line, and remove
the misleading comment.
Reported-by: Éric Piel <piel@delmic.com>
Fixes: 080e6795cb ("staging: comedi: ni_mio_common: Cleans up/clarifies ni_ao_cmd")
Cc: Éric Piel <piel@delmic.com>
Cc: Spencer E. Olson <olsonse@umich.edu>
Cc: <stable@vger.kernel.org> # 4.7+
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Centralize the "clean-up on error" handling in `comedi_init()` using
`goto` statements. Also change some of the explicit `-EIO` return
values to the error return values from the failing functions as there is
no good reason to use `-EIO` explicitly.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
There is a clean-up bug in the core comedi module initialization
functions, `comedi_init()`. If the `comedi_num_legacy_minors` module
parameter is non-zero (and valid), it creates that many "legacy" devices
and registers them in SysFS. A failure causes the function to clean up
and return an error. Unfortunately, it fails to destroy the "comedi"
class that was created earlier. Fix it by adding a call to
`class_destroy(comedi_class)` at the appropriate place in the clean-up
sequence.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Cc: <stable@vger.kernel.org> # 3.9+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Fixed coding style issue where trailing */ in block comments
were not on separate lines.
Signed-off-by: Elias Carter <edcarter@ualberta.ca>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Function pci_ioremap_bar() will return a NULL pointer if there is no
enough memory. However, in function apci3xxx_auto_attach(), the return
value of function pci_ioremap_bar() is not validated. This may result in
NULL dereference in following access to dev->mmio. This patch fixes the
bug.
Signed-off-by: Pan Bian <bianpan2016@163.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
If a process that has mmap'd a COMEDI buffer is being run under a
debugger such as GDB, the buffer contents are inaccessible from the
debugger. Support the `access()` VM operation to allow the buffer
contents to be accessed by another process.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
staging: comedi: drivers: s626.c - fixed the following checkpatch issue:
CHECK: Prefer kernel type 's16' over 'int16_t'
#1939: FILE: drivers/staging/comedi/drivers/s626.c:1939:
+ int16_t dacdata = (int16_t)data[i];
Signed-off-by: Andrea della Porta <sfaragnaus@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Convert the `CLK_CLKFIG(chan, src)` macro to a static function
`pci224_clk_config(chan, src)`. This is consistent with an earlier
change to convert `GAT_CONFIG(chan, src)` to a static function.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Let the compiler figure out whether `pci224_gat_confip()` should be
inlined by itself.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Convert the `CLK_CONFIG(chan, src)` macro to a static function
`pci230_clk_config(chan, src)`. This is consistent with an earlier
change to convert `GAT_CONFIG(chan, src)` to a static function.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Let the compiler figure out whether `pci230_gat_config()` should be
inlined by itself.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
When COMEDI_NI_LABPC is built-in and COMEDI_NI_LABPC_ISA is a loadable
module, thhe ISA DMA code is not reachable by the common module, causing
a link error:
drivers/staging/built-in.o: In function `labpc_interrupt':
ni_labpc_common.c:(.text+0x1d178): undefined reference to `labpc_handle_dma_status'
ni_labpc_common.c:(.text+0x1d1cb): undefined reference to `labpc_drain_dma'
drivers/staging/built-in.o: In function `labpc_ai_cmd':
ni_labpc_common.c:(.text+0x1d8ad): undefined reference to `labpc_setup_dma'
This changes the definition of COMEDI_NI_LABPC_ISADMA so that it will
also be builtin for that case. This looks like a rather old bug, but
I have never seen this in randconfig testing until today.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Convert macro GAT_CONFIG to static inline function as static inline
functions are preferred over macros. This change is possible since the
arguments at all call sites have the same type.
The uses were updated with Coccinelle:
@r1@
expression dev,reg,chan,src;
@@
-GAT_CONFIG(chan, src)
+pci224_gat_config(chan, src)
Also, the comment describing the macro has been removed.
Signed-off-by: simran singhal <singhalsimran0@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Simplify function return by merging assignment and return into a single
line. The following coccinelle script is used to fix this issue.
@@
expression e;
local idexpression ret;
@@
-ret = e;
-return ret;
+return e;
Signed-off-by: Varsha Rao <rvarsha016@gmail.com>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Change the MODULE_DESCRIPTION string from the generic "Comedi low-level
driver" to the more specific "Comedi driver for JR3/PCI force sensor
board".
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
`jr3_pci_alloc_spriv()` initializes `spriv->range[8]` to use a maximum
value of 65536, but that will be overwritten with 65535 at a later time
by `jr3_pci_poll_subdevice()` once the "set full scales" command is
complete. The initial setting looks like a mistake. This range is only
associated with a couple of dummy channels (channels 56 and 57) to read
back the model number and serial number, so no user code should be
attempting to convert those numbers to physical units. Just change the
initial value to 65535 to match the final value.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The various supported boards have different numbers of subdevices from 1
to 4. Each subdevice needs a block of registers in PCI BAR 0. Check
the region is large enough for the required number of subdevices.
Return an error from `jr3_pci_auto_attach()` if it is too small.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The driver currently checks the size of `struct jr3_sensor` is correct
when a device is attached, returning an error if it is wrong. Replace
that with a compile-time check. We don't care too much about the size
of `struct jr3_sensor` as it is embedded in the larger `struct
jr3_block` and is followed by a lot of padding. We should care more
that the size of `struct jr3_block` is correct, as it describes the
overall register layout of a block, and there is an array of such blocks
(one per subdevice). Check its size at compile-time using the
`BUILD_BUG_ON()` macro.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
`jr3_pci_open()` outputs several debug log messages containing serial
numbers of the sensors (one per subdevice) along with a pointer to the
subdevice private data structure. The latter is of no use, so reformat
the debug log to omit it.
`jr3_pci_alloc_spriv()` outputs a debug log message containing more
useless information about the remapped base address of the board
registers, the sensor registers, and the difference between them. Get
rid of it.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
`struct jr3_t` contains a single array member `block` of member type
`struct jr3_block`. Rather than using pointers to `struct jr3_t`, just
use pointers to `struct jr3_block` instead and treat it as an array.
Replace the local variables `struct jr3_t __iomem *iobase` with `struct
jr3_block __iomem *block`. Remove the definition of `struct jr3_t` as
it is no longer needed.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
`struct jr3_t` contains a single array member `block` of a tag-less
`struct` type. Rename the tag-less `struct` type to `struct jr3_block`
and move its definition outside of `struct jr3_t`. This will allow us
to use pointers of this type.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The term "channel" is overloaded in this driver. Rename the `channel`
member of `struct jr3_t` to `block` to reduce confusion. `block` is an
array of an anonymous `struct` type, with each element covering the
registers for one subdevice.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Rename the `channel[x].data` member of `struct jr3_t` to
`channel[x].sensor` to match its type `struct jr3_sensor`. Also rename
local variable `ch0data` in `jr3_pci_show_copyright()` to `sensor0` for
consistency. It points to the `struct jr3_sensor` embedded in the
registers for "channel" 0.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The driver overloads the term "channel" a lot. To help reduce
confusion, rename the `channel` member of `struct
jr3_pci_subdev_private` to `sensor` as it points to a `struct
jr3_sensor`. Also rename the various function parameters and local
variables called `channel` that point to a `struct jr3_sensor` to
`sensor`.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The driver overloads the term "channel" a lot. To help reduce
confusion, rename `struct jr3_channel` to `struct jr3_sensor`.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Variable dac_data is already declared as of type u8. Again explicit type
casting of dac_data to u8, is not required. Hence this patch removes it
by using the following coccinelle script.
@@
type T;
T *ptr;
T p;
@@
(
- (T *)(&p)
+ &p
|
- (T *)ptr
+ ptr
|
- (T *)(ptr)
+ ptr
|
- (T)(p)
+ p
)
Signed-off-by: Varsha Rao <rvarsha016@gmail.com>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The `device_ids[]` passed to `MODULE_DEVICE_TABLE()` should be `const`.
When the "ni_atmio" driver is built-in, gcc warns about `device_ids`
being defined but ununsed. Make it `const`.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
There is no particular reason why comedi has to be built as kernel
modules. Remove the `depends on m` from the Kconfig file to allow it to
be built-in.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Change to unsigned to allow removal of negative value check in
init section. Use smaller data type since the max possible
value currently is 48.
Signed-off-by: Cheah Kok Cheong <thrust73@gmail.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This patch replace "is is " with "is". The replacement couldn't be
automated because sometimes the first "is" was meant to be another
word.
Signed-off-by: simran singhal <singhalsimran0@gmail.com>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Fix checkpatch warning "Avoid multiple line dereference"
using a pointer variable to avoid line wrap.
Signed-off-by: Cheah Kok Cheong <thrust73@gmail.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Checkpatch emits WARNING: Block comments use a trailing */ on a
separate line. Offending comments are commenting variables within
the main data structure of s626 driver. We can move these comments
to kernel doc format with the benefit of clearing the warning and
improving the documentation for the driver.
Remove comments on structure members. Add original comments to the
head of the structure definition in kernel doc format.
Signed-off-by: Tobin C. Harding <me@tobin.cc>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The "jr3_pci" driver currently uses the `iobase` member of its private
device data `struct jr3_pci_dev_private` to store a pointer to its
ioremapped register region. Use the `mmio` member of the `struct
comedi_device` to store this instead, and remove the `iobase` member.
The `iobase` member was of type `struct jr3_t __iomem *`, with the
board's complicated register layout described by `struct jr3_t`. The
`mmio` member is a generic `void __iomem *`, so its value needs
converting to a `struct jr3_t __iomem *` for our purposes.
Change the clean-up in `jr3_pci_detach()` to call `comedi_pci_detach()`
instead of `comedi_pci_disable()`, as that will iounmap `dev->mmio` for
us.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Local function `set_transforms` has a parameter of type `struct
jr3_pci_transform`. This has a size 32 bytes, which is quite large for
passing around in a function call. Change it to use type `const struct
jr3_pci_transform *`. (In practice, it is probably inlined by the
compiler anyway, but doing this seems to save a few bytes.)
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The `range` member of `struct jr3_pci_subdev_private` is an array of a
tag-less `struct` type whose layout is similar to `struct
comedi_lrange`. Both `struct` types end with a member also called
`range`. In the case of tag-less `struct` type, it is a single `struct
comedi_krange`. In the case of `struct comedi_lrange`, it is a flexible
array of `struct comedi_krange`.
Elements of the `range` array member in `struct jr3_pci_subdev_private`
are pointed to by elements of the `range_table_list` array member, which
are of type `const struct comedi_lrange *`. This requires some dodgy
type casting.
To avoid the dodgy type casting, change the element type of the `range`
member of `struct jr3_pci_subdev_private` to be a new type `union
jr3_pci_single_range`. This contains a member `l` of type `struct
comedi_lrange`, and an array member `_reserved` that is large enough to
encompass the `struct comedi_lrange` plus a single `struct
comedi_krange`. It is the same size as the previous type. Accesses to
`spriv->range[i].length` and `spriv->range[i].range` are replaced with
`spriv->range[i].l.length` and `spriv->range[i].l.range[0]` respectively
(where `spriv` is a `struct jr3_pci_subdev_private *`, and `i` is an
array index). Type-casted pointers to `spriv->range[i]` are replaced
with pointers to `spriv->range[i].l`, which do not require the type
casts. Since we defined a new type, we can define local variables of
the corresponding pointer type to shorten some lines of code. This is
made use of in `jr3_pci_alloc_spriv()`.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The type of the `state` member of `struct jr3_pci_subdev_private` is
defined in-situ as an enumerated type without a tag. For aesthetic
reasons, define the type as `enum jr3_pci_poll_state` outside the
containing `struct`.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The `next_time_max` member of `struct jr3_pci_subdev_private` is
assigned to, but never read. Remove it.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
If `jr3_pci_auto_attach()` returns with no error, we can now be sure
that the COMEDI subdevice private data structures have been allocated.
Remove the tests for a valid pointer to the private data structure in
`jr3_pci_ai_insn_read()`, `jr3_pci_open()`, and
`jr3_pci_poll_subdevice()`, since they will not be called if the pointer
is invalid.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
If debug messages are enabled, the card initialization done in
`jr3_pci_auto_attach()` spits out 24 (0x18) debug messages to show the
null-terminated copyright string embedded in the firmware, one character
at a time, including the ASCII NUL characters at the end. Factor out
the copyright display into a new function `jr3_pci_show_copyright()` and
re-work it to copy the whole copyright string into a buffer, so that it
can be shown with a single debug message.
Incidentally, this also removes a checkpatch warning "Avoid multiple
line dereference" in the original code.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Fix three checkpatch warnings of the form:
WARNING: struct comedi_lrange should normally be const
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The various JR3 PCI models have from 1 to 4 DSPs, one per subdevice.
Prior to loading the firmware to all the DSPs, the initialization code
in `jr3_pci_auto_attach()` resets the first DSP. As far as I can tell,
it should reset all of them. Change it to do so.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The timer expiry routine `jr3_pci_poll_dev()` checks for expiry by
checking whether the absolute value of `jiffies` (stored in local
variable `now`) is greater than the expected expiry time in jiffy units.
This will fail when `jiffies` wraps around. Also, it seems to make
sense to handle the expiry one jiffy earlier than the current test. Use
`time_after_eq()` to check for expiry.
Cc: <stable@vger.kernel.org> # 3.15+
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
For some reason, the driver does not consider allocation of the
subdevice private data to be a fatal error when attaching the COMEDI
device. It tests the subdevice private data pointer for validity at
certain points, but omits some crucial tests. In particular,
`jr3_pci_auto_attach()` calls `jr3_pci_alloc_spriv()` to allocate and
initialize the subdevice private data, but the same function
subsequently dereferences the pointer to access the `next_time_min` and
`next_time_max` members without checking it first. The other missing
test is in the timer expiry routine `jr3_pci_poll_dev()`, but it will
crash before it gets that far.
Fix the bug by returning `-ENOMEM` from `jr3_pci_auto_attach()` as soon
as one of the calls to `jr3_pci_alloc_spriv()` returns `NULL`. The
COMEDI core will subsequently call `jr3_pci_detach()` to clean up.
Cc: <stable@vger.kernel.org> # 3.15+
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Fix up affected files that include this signal functionality via sched.h.
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Here is the big staging and iio driver patchsets for 4.11-rc1.
We almost broke even this time around, with only a few thousand lines
added overall, as we removed the old and obsolete i4l code, but added
some new drivers for the RPi platform, as well as adding some new IIO
drivers.
All of these have been in linux-next for a while with no reported
issues.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'staging-4.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging
Pull staging/iio driver updates from Greg KH:
"Here is the big staging and iio driver patchsets for 4.11-rc1.
We almost broke even this time around, with only a few thousand lines
added overall, as we removed the old and obsolete i4l code, but added
some new drivers for the RPi platform, as well as adding some new IIO
drivers.
All of these have been in linux-next for a while with no reported
issues"
* tag 'staging-4.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging: (669 commits)
Staging: vc04_services: Fix the "space prohibited" code style errors
Staging: vc04_services: Fix the "wrong indent" code style errors
staging: octeon: Use net_device_stats from struct net_device
Staging: rtl8192u: ieee80211: ieee80211.h - style fix
Staging: rtl8192u: ieee80211: ieee80211_tx.c - style fix
Staging: rtl8192u: ieee80211: rtl819x_BAProc.c - style fix
Staging: rtl8192u: ieee80211: ieee80211_module.c - style fix
Staging: rtl8192u: ieee80211: rtl819x_TSProc.c - style fix
Staging: rtl8192u: r8192U.h - style fix
Staging: rtl8192u: r8192U_core.c - style fix
Staging: rtl8192u: r819xU_cmdpkt.c - style fix
staging: rtl8192u: blank lines aren't necessary before a close brace '}'
staging: rtl8192u: Adding space after enum and struct definition
staging: rtl8192u: Adding space after struct definition
Staging: ks7010: Add required and preferred spaces around operators
Staging: ks7010: ks*: Remove redundant blank lines
Staging: ks7010: ks*: Add missing blank lines after declarations
staging: visorbus, replace init_timer with setup_timer
staging: vt6656: rxtx.c Removed multiple dereferencing
staging: vt6656: Alignment match open parenthesis
...
Currently this module needs to be manually configured by COMEDI
userspace tool before the test waveform can be read by a COMEDI
compatible application.
This patch adds auto-configuration capability and makes it the default
loading option. This is achieved by creating a device during init
to stand in for a real hardware device. This allows comedi_auto_config()
to perform auto-configuration. With this patch, the test waveform can
be read by a COMEDI compatible application without needing manual
configuration.
Previous behaviour is still selectable via module loading parameter.
Module loading without passing any parameter will default to
auto-configuration with the same default waveform amplitude and
period values. For auto-configuration, different amplitude and
period values can be set via module loading parameters.
Tested on Xubuntu 16.04 using Xoscope ver: 2.0 which is available
in the Ubuntu repository. Xoscope is a COMEDI compatible digital
oscilloscope application. For manual configuration, only module
loading/unloading is tested.
Here are the truncated dmesg output.
[sudo modprobe comedi_test]
comedi_test: 1000000 microvolt, 100000 microsecond waveform attached
driver 'comedi_test' has successfully auto-configured 'comedi_test'.
[sudo modprobe comedi_test amplitude=2500000 period=150000]
comedi_test: 2500000 microvolt, 150000 microsecond waveform attached
driver 'comedi_test' has successfully auto-configured 'comedi_test'.
[sudo modprobe comedi_test noauto=1]
comedi_test: module is from the staging directory, the quality is unknown,
you have been warned.
For those without an actual hardware, the comedi_test module
is as close as one can get to test the COMEDI system.
Having both auto and manual configuration capability will broaden
the test function of this module.
Hopefully this will make it easier for people to check out the
COMEDI system and contribute to its development.
Signed-off-by: Cheah Kok Cheong <thrust73@gmail.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Ian Abbott