Commit Graph

48 Commits

Author SHA1 Message Date
Bartosz Golaszewski 058de3486b gpio: mockup: use the SPDX identifier and remove license boilerplate
Use the SPDX license identifier for GPLv2.0 or later and remove the
license boilerplate.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2018-05-16 14:35:24 +02:00
Bartosz Golaszewski 6cb9215bae gpio: mockup: fix a potential crash when creating debugfs entries
If we failed to create the top debugfs directory, we must not try to
create the child nodes. We currently only check if gpio_mockup_dbg_dir
is not NULL, but it can also contain an errno if debugfs is disabled
in build options. Use IS_ERR_OR_NULL() instead.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2018-03-27 15:18:20 +02:00
Linus Walleij 4f9a4cd66c gpio: mockup: Update Bamvors mail address
Bamvor changed his mail so let's updat his mail address
everywhere.

Cc: Bamvor Jian Zhang <bamv2005@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2018-03-06 09:04:15 +01:00
Bartosz Golaszewski c4b54e138a gpio: mockup: fix a return value check
The return value of platform_device_register_resndata() on error is
an error code converted to pointer with ERR_PTR(), not NULL.

Check the return value correctly.

Fixes: 8a39f597bc ("gpio: mockup: rework device probing")
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-12-08 15:34:15 +01:00
Bartosz Golaszewski cd9835f1c6 gpio: mockup: add helpers for accessing the gpio ranges
In order to avoid repeating the calculations on every access - add
helpers for gpio base and ngpio components of the ranges array.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-12-02 22:42:31 +01:00
Bartosz Golaszewski e63a006f70 gpio: mockup: rename gpio_mockup_params_nr to gpio_mockup_num_ranges
This variable holds the number of mockup GPIO ranges so rename it
accordingly.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-12-02 22:42:31 +01:00
Bartosz Golaszewski 1e0dca677b gpio: mockup: modify the return value check for devm_irq_sim_init()
As discussed with Marc Zyngier: irq_sim_init() and its devres variant
should return the base of the allocated interrupt range on success
rather than 0. This will be modified later - first, change the way
users handle the return value of these routines.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-12-02 22:42:30 +01:00
Bartosz Golaszewski c47bee95f6 gpio: mockup: implement gpio_mockup_set_multiple()
Implement the set_multiple() callback and register it with the gpiolib
framework. This is only meant to also test the internal kernel API.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-12-02 22:42:30 +01:00
Bartosz Golaszewski 2a9d742c26 gpio: mockup: tweak line breaks
Minor readability tweak: prefer breaking the lines in a way where the
second part is longer than the first.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-12-02 22:42:29 +01:00
Bartosz Golaszewski fa86963a75 gpio: mockup: verify that ngpio > 0
Improve the module params sanitization: bail out from init if the user
tries to pass a non-positive number of GPIO lines for any mockup chip.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-12-02 22:42:28 +01:00
Bartosz Golaszewski 46526c15ca gpio: mockup: fix debugfs handling
The debugfs routines returning pointers can return NULL or error codes
embedded with ERR_PTR(). Check the return values with IS_ERR_OR_NULL().

While we're at it: make the error message more specific so it's not
confused with the one emitted when the top-level gpio-mockup debugfs
directory creation fails.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-12-02 22:42:28 +01:00
Bartosz Golaszewski 1cea4734f9 gpio: mockup: group code by logic
Keep GPIO chip callbacks, event trigger callbacks and mockup chip
setup code visibly separated. We're mostly good - just need to move
the line naming routine below.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-12-02 22:42:28 +01:00
Bartosz Golaszewski 5b7908c024 gpio: mockup: change the type of value field in line state struct
GPIO values are universally represented as integers. Change the type
of the variable storing the current line value to int for consistency.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-12-02 22:42:27 +01:00
Bartosz Golaszewski ca8792af40 gpio: mockup: extend the debugfs layout
Currently each chip has a dedicated directory in debugfs for event
triggers. We use the chip's label for the directory name, but the user
can't really associate these directories with chip names without
parsing the relevant sysfs entries.

Use chip names for directory names. For backward compatibility: create
links pointing to the actual directories named using the chip labels.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-12-02 22:42:27 +01:00
Bartosz Golaszewski c3196a7828 gpio: mockup: pass the named_lines parameter over platform_data
Move the last bits of code dealing with module parameters to the init
function. Add a new variable to platform data, which indicates to the
probe function if it should name the GPIO lines. If we ever want to
make the line naming more fine-grained (e.g. per chip switch) it will
be easier this way.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-12-02 22:42:26 +01:00
Bartosz Golaszewski 6d974d3291 gpio: mockup: merge gpio_mockup_add() into gpio_mockup_probe()
Now that the probe() function only does what is should, there's no
need to split the chip adding logic into a separate routine. Merge
gpio_mockup_add() into gpio_mockup_probe().

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-12-02 22:42:26 +01:00
Bartosz Golaszewski b9576d03d5 gpio: mockup: remove a stray tab
Minor coding style fix.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-12-02 22:42:25 +01:00
Bartosz Golaszewski f1bec99ae4 gpio: mockup: implement gpio_mockup_err()
Visually shrink the pr_err() calls by encapsulating adding the module
name prefix to the message in a macro.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-12-02 22:42:25 +01:00
Bartosz Golaszewski 8a39f597bc gpio: mockup: rework device probing
We currently create a single platform device in init and then parse
the configuration passed to us via module parameters in probe() before
creating GPIO chips and registering them with the gpiolib framework.

The relation between platform devices and mockup chips should be 1:1.

Create a separate platform device for each mockup chip using convenient
helpers (platform_device_register_resndata()). Pass a platform data
structure to probe() in which the configuration (GPIO base, number of
lines, chip index) extracted from the module params is stored. Make
probe() create a single mockup chip for every platform device.

This approach has several advantages:
- we only parse the module parameters in init() and can bail out before
  attaching any device if the input is invalid (currently we would
  have to examine kernel logs),
- we'll get notified by the device framework about errors in probe()
  for specific chips,
- probe() gets simplified and only does what it's supposed to.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-12-02 22:42:24 +01:00
Bartosz Golaszewski b447a75100 gpio: mockup: verify the number of GPIO chips requested
The number of supported mockup chips is limited. Check this limit when
parsing the module parameters.

Also: make sure that each chip is described with a <base - ngpio> pair.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-12-02 22:42:24 +01:00
Bartosz Golaszewski 20c35ac473 gpio: mockup: parse the module params in init, not probe
If the module parameters are invalid, we should bail out from the init
function instead of detecting it during the device probe. That way we
don't even allow the user to load the module if we don't accept the
arguments.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-12-02 22:42:23 +01:00
Bartosz Golaszewski f3b47170e0 gpio: mockup: add missing prefixes
Add the gpio_mockup_ prefix to the remaining symbols that still don't
have it, so that the entire driver code is consistent.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-12-02 22:42:23 +01:00
Colin Ian King 02b6bddb0b gpio: mockup: remove unused variable gc
The variable gc is assigned but never read and is redundant. Remove it.
Cleans up clang warning:

drivers/gpio/gpio-mockup.c:169:2: warning: Value stored to 'gc' is never read

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-08-31 15:21:07 +02:00
Bartosz Golaszewski b4c495f03a gpio: mockup: use irq_sim
Shrink the driver by removing the code dealing with dummy interrupts
and replacing it with calls to the irq_sim API.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-08-21 00:12:30 +02:00
Bartosz Golaszewski f6ac438e5e gpio: mockup: use devm_kcalloc() where applicable
When allocating a zeroed array of objects use devm_kcalloc() instead
of manually calculating the required size and using devm_kzalloc().

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-06-20 09:19:12 +02:00
Bartosz Golaszewski c60c7f4c6b gpio: mockup: add myself as author
Just taking credit for the recent changes and new features. :)

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-06-20 09:19:09 +02:00
Bartosz Golaszewski ec604f151e gpio: mockup: improve the error message
Indicate the error number and make the message a bit more elaborate.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-06-20 09:19:05 +02:00
Bartosz Golaszewski 4dc9d76c98 gpio: mockup: don't return magic numbers from probe()
When the requested number of GPIO lines is 0, return -EINVAL, not
-1 which is -EPERM.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-06-20 09:18:59 +02:00
Bartosz Golaszewski b652336d3f gpio: mockup: improve readability
We currently shift bits here and there without actually explaining
what we're doing. Add some helper variables with names indicating
their purpose to improve the code readability.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-06-20 09:18:55 +02:00
Bartosz Golaszewski b6c2e77d34 gpio: mockup: refuse to accept an odd number of GPIO ranges
Currently we ignore the last odd range value, since each chip is
described by two values. Be more strict and require the user to
pass an even number of ranges.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-06-20 09:18:51 +02:00
Bartosz Golaszewski 650b57b083 gpio: mockup: tweak gpio_mockup_event_write()
Invert the logic of the irq_enabled check and only access the private
data after the input is sanitized.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-06-20 09:18:47 +02:00
Bartosz Golaszewski 6f9b3e776d gpio: mockup: improve the debugfs input sanitization
We're currently only checking the first character of the input to the
debugfs event files, so a string like '0sdfdsf' is valid and indicates
a falling edge event.

Be more strict and only allow '0', '1', '0\n' & '1\n'.

While we're at it: move the sanitization code before the irq_enabled
check so that we indicate an error on invalid input even if nobody is
waiting for events.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-06-20 09:18:33 +02:00
Bartosz Golaszewski c7f5326fb4 gpio: mockup: support irqmask and irqunmask
Even though this is a testing module, be nice and actually implement
these functions.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-05-29 13:29:40 +02:00
Bartosz Golaszewski 01a3f23c16 gpio: mockup: be quiet unless something goes wrong
When inserting and removing the module repeatedly (e.g. when running
the libgpiod test-suite) the kernel log gets clobbered with messages
reporting successful creation of dummy gpiochips.

Remove this message and only emit logs when something bad happens.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-05-29 13:28:58 +02:00
Bartosz Golaszewski c650c00c10 gpio: mockup: add prefixes to the direction enum
All internal symbols except for the direction enum follow the same
convention and use the gpio_mockup prefix. Add the prefix to the
DIR_IN and DIR_OUT definitions as well for consistency across the
file.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-05-29 13:28:09 +02:00
Bartosz Golaszewski c9546cf141 gpio: mockup: fix direction values
The comment in linux/gpio/driver.h says:

 @get_direction: returns direction for signal "offset", 0=out, 1=in

We got those switched at some point. Fix the values.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-05-29 13:27:24 +02:00
Linus Torvalds 2bd8040174 This is the bulk of GPIO changes for the v4.12 kernel cycle:
Core changes
 
 - Return NULL from gpiod_get_optional() when GPIOLIB is disabled.
   This was a much discussed change. It affects use cases where people
   write drivers that might or might not be using GPIO resources.
   I have decided that this is the lesser evil right now.
 
 - Make gpiod_count() behave consistently across different hardware
   descriptions.
 
 - Fix the syntax around open drain/open source to not infer active
   high/low semantics.
 
 New drivers
 
 - A new single-register fixed-direction framework driver for hardware
   that have lines controlled by a single register that just work in
   one direction (out or in), including IRQ support.
 
 - Support the Fintek F71889A GPIO SuperIO controller.
 
 - Support the National NI 169445 MMIO GPIO.
 
 - Support for the X-Gene derivative of the DWC GPIO controller
 
 - Support for the Rohm BD9571MWV-M PMIC GPIO controller.
 
 - Refactor the Gemini GPIO driver to a generic Faraday FTGPIO driver
   and replace both the Gemini and the Moxa ART custom drivers with
   this driver.
 
 Driver improvements
 
 - A whole slew of drivers have their spinlocks chaned to raw spinlocks
   as they provide irqchips, and thus we are progressing on realtime
   compliance.
 
 - Use devm_irq_alloc_descs() in a slew of drivers, getting managed
   resources.
 
 - Support for the embedded PWM controller inside the MVEBU driver.
 
 - Debounce, open source and open drain support for the Aspeed driver.
 
 - Misc smaller fixes like spelling and syntax and whatnot.
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Merge tag 'gpio-v4.12-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio

Pull GPIO updates from Linus Walleij:
 "This is the bulk of GPIO changes for the v4.12 kernel cycle.

  Core changes:

   - Return NULL from gpiod_get_optional() when GPIOLIB is disabled.
     This was a much discussed change. It affects use cases where people
     write drivers that might or might not be using GPIO resources. I
     have decided that this is the lesser evil right now.

   - Make gpiod_count() behave consistently across different hardware
     descriptions.

   - Fix the syntax around open drain/open source to not infer active
     high/low semantics.

  New drivers:

   - A new single-register fixed-direction framework driver for hardware
     that have lines controlled by a single register that just work in
     one direction (out or in), including IRQ support.

   - Support the Fintek F71889A GPIO SuperIO controller.

   - Support the National NI 169445 MMIO GPIO.

   - Support for the X-Gene derivative of the DWC GPIO controller

   - Support for the Rohm BD9571MWV-M PMIC GPIO controller.

   - Refactor the Gemini GPIO driver to a generic Faraday FTGPIO driver
     and replace both the Gemini and the Moxa ART custom drivers with
     this driver.

  Driver improvements:

   - A whole slew of drivers have their spinlocks chaned to raw
     spinlocks as they provide irqchips, and thus we are progressing on
     realtime compliance.

   - Use devm_irq_alloc_descs() in a slew of drivers, getting managed
     resources.

   - Support for the embedded PWM controller inside the MVEBU driver.

   - Debounce, open source and open drain support for the Aspeed driver.

   - Misc smaller fixes like spelling and syntax and whatnot"

* tag 'gpio-v4.12-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio: (77 commits)
  gpio: f7188x: Add a missing break
  gpio: omap: return error if requested debounce time is not possible
  gpio: Add ROHM BD9571MWV-M PMIC GPIO driver
  gpio: gpio-wcove: fix GPIO IRQ status mask
  gpio: DT bindings, move tca9554 from pcf857x to pca953x
  gpio: move tca9554 from pcf857x to pca953x
  gpio: arizona: Correct check whether the pin is an input
  gpio: Add XRA1403 DTS binding documentation
  dt-bindings: add exar to vendor prefixes list
  gpio: gpio-wcove: fix irq pending status bit width
  gpio: dwapb: use dwapb_read instead of readl_relaxed
  gpio: aspeed: Add open-source and open-drain support
  gpio: aspeed: Add debounce support
  gpio: aspeed: dt: Add optional clocks property
  gpio: aspeed: dt: Fix description alignment in bindings document
  gpio: mvebu: Add limited PWM support
  gpio: Use unsigned int for interrupt numbers
  gpio: f7188x: Add F71889A GPIO support.
  gpio: core: Decouple open drain/source flag with active low/high
  gpio: arizona: Correct handling for reading input GPIOs
  ...
2017-05-04 12:05:32 -07:00
Bartosz Golaszewski 62a7ca0735 gpio: mockup: use devm_irq_alloc_descs()
Use the resource managed variant of irq_alloc_descs(). This allows us
to remove gpio_mockup_remove().

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Reviewed-by: Bamvor Jian Zhang <bamvor.zhangjian@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-03-15 11:16:32 +01:00
Dan Carpenter fa6256db03 gpio: mockup: return -EFAULT if copy_from_user() fails
copy_from_user() returns the number of bytes remaining to be copied but
we want to return negative error codes on failue.

Fixes: 9202ba2397 ("gpio: mockup: implement event injecting over debugfs")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-03-06 14:35:21 +01:00
Bartosz Golaszewski 9202ba2397 gpio: mockup: implement event injecting over debugfs
Create a debugfs directory for every mockup chip and a single file
for every line. Writing (0 or 1) to these files allows the user to
inject line events (falling or rising edge respectively).

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-02-13 08:36:47 +01:00
Bartosz Golaszewski e2ff740895 gpio: mockup: add a dummy irqchip
Setup a dummy irqchip that will allow us to inject line events for
testing purposes.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-02-13 08:35:33 +01:00
Bartosz Golaszewski 8a68ea00a6 gpio: mockup: implement naming the lines
In order to allow testing line lookup by name from user space, add
a new boolean parameter that indicates whether we want the lines to
be named. The name is created by concatenating the chip name and the
line offset value.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-02-06 14:22:11 +01:00
Bartosz Golaszewski e4ba07bf8d gpio: mockup: code shrink
Moving a couple of lines around allows us to shrink the code a bit
while keeping the same functionality.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-02-06 14:21:13 +01:00
Bartosz Golaszewski ca40916078 gpio: mockup: readability tweaks
The following patch tries to improve the readability of the mockup
driver.

The driver is called gpio-mockup, so add the same prefix to all
functions and structures.

Add some newlines and use a temporary pointer in gpio_mockup_add().

Drop the name of the direction enum and rename the enum values to
better reflect their purpose.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-02-06 14:20:12 +01:00
Bartosz Golaszewski 364ac45655 gpio: mockup: coding style fixes
Fix whitespace errors and arrange local variables for better
readability.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2016-12-28 14:13:38 +01:00
Bartosz Golaszewski ad6d8004fa gpio: mockup: dynamically allocate memory for chip name
Currently the chip name buffer is allocated on the stack and the
address of the buffer is passed to the gpio framework. It's invalid
after probe() returns, so the sysfs label attribute displays garbage.

Use devm_kasprintf() for each string instead.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2016-12-28 14:12:51 +01:00
Bartosz Golaszewski e53c60289d gpio: mockup: make pins_name_start static
This variable is not used outside this module. Make it static.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2016-12-28 14:11:57 +01:00
Bamvor Jian Zhang 0f98dd1b27 gpio/mockup: add virtual gpio device
This patch add basic structure of a virtual gpio device(gpio-mockup)
for testing gpio subsystem. The tester could manipulate such device
through userspace(sysfs or char device) and check the result from
debugfs.

Currently, it support one or more gpiochip(determined by module
parameters with base,ngpio pair). One could test the overlap of
different gpiochip and test the direction and/or output values of
these chips.

Signed-off-by: Kamlakant Patel <kamlakant.patel@broadcom.com>
Signed-off-by: Bamvor Jian Zhang <bamvor.zhangjian@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2016-09-26 11:47:14 -07:00