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  1. 14 3月, 2014 1 次提交
    • A
      gpio: clamp returned values to the boolean range · 23600969
      由 Alexandre Courbot 提交于 
      Nothing prevents GPIO drivers from returning values outside the
boolean range, and as it turns out a few drivers are actually doing so.
These values were passed as-is to unsuspecting consumers and created
confusion.

This patch makes the internal _gpiod_get_raw_value() function return a
bool, effectively clamping the GPIO value to the boolean range no
matter what the driver does.

While we are at it, we also change the value parameter of
_gpiod_set_raw_value() to bool type before drivers start doing funny
things with it as well.

Another way to fix this would be to change the prototypes of the driver
interface to use bool directly, but this would require a huge
cross-systems patch so this simpler solution is preferred.

Changes since v1:
- Change local variable type to bool as well, use boolean values in
  code
- Also change prototype of open drain/open source setting functions
  since they are only called from _gpiod_set_raw_value()

This probably calls for a larger booleanization of gpiolib, but let's
keep that for a latter change - right now we need to address the issue
of non-boolean values returned by drivers.
Signed-off-by: NAlexandre Courbot <acourbot@nvidia.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
      23600969
  3. 13 3月, 2014 4 次提交
    • M
      gpio / ACPI: Rework ACPI GPIO event handling · 6072b9dc
      由 Mika Westerberg 提交于 
      The current ACPI GPIO event handling code was never tested against real
hardware with functioning GPIO triggered events (at the time such hardware
wasn't available). Thus it misses certain things like requesting the GPIOs
properly, passing correct flags to the interrupt handler and so on.

This patch reworks ACPI GPIO event handling so that we:

 1) Use struct acpi_gpio_event for all GPIO signaled events.
 2) Switch to use GPIO descriptor API and request GPIOs by calling
    gpiochip_request_own_desc() that we added in a previous patch.
 3) Pass proper flags from ACPI GPIO resource to request_threaded_irq().

Also instead of open-coding the _AEI iteration loop we can use
acpi_walk_resources(). This simplifies the code a bit and fixes memory leak
that was caused by missing kfree() for buffer returned by
acpi_get_event_resources().

Since the remove path now calls gpiochip_free_own_desc() which takes GPIO
spinlock we need to call acpi_gpiochip_remove() outside of that lock
(analogous to acpi_gpiochip_add() path where the lock is released before
those funtions are called).
Signed-off-by: NMika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
      6072b9dc
    • M
      gpio / ACPI: Rename acpi_gpio_evt_pin to acpi_gpio_event · 4b01a14b
      由 Mika Westerberg 提交于 
      In order to consolidate _Exx, _Lxx and _EVT to use the same structure make
the structure name to reflect that we are dealing with any event, not just
_EVT.

This is just rename, no functional changes.
Signed-off-by: NMika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
      4b01a14b
    • M
      gpio / ACPI: Allocate ACPI specific data directly in acpi_gpiochip_add() · aa92b6f6
      由 Mika Westerberg 提交于 
      We are going to add more ACPI specific data to accompany GPIO chip so
instead of allocating it per each use-case we allocate it once when
acpi_gpiochip_add() is called and release it when acpi_gpiochip_remove() is
called.

Doing this allows us to add more ACPI specific data by merely adding new
fields to struct acpi_gpio_chip.

In addition we embed evt_pins member directly to the structure instead of
having it as a pointer. This simplifies the code a bit since we don't need
to check against NULL.
Signed-off-by: NMika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
      aa92b6f6
    • M
      gpiolib: Allow GPIO chips to request their own GPIOs · 77c2d792
      由 Mika Westerberg 提交于 
      Sometimes it is useful to allow GPIO chips themselves to request GPIOs they
own through gpiolib API. One use case is ACPI ASL code that should be able
to toggle GPIOs through GPIO operation regions.

We can't use gpio_request() because it will pin the module to the kernel
forever (it calls try_module_get()). To solve this we move module refcount
manipulation to gpiod_request() and let __gpiod_request() handle the actual
request. This changes the sequence a bit as now try_module_get() is called
outside of gpio_lock (I think this is safe, try_module_get() handles
serialization it needs already).

Then we provide gpiolib internal functions gpiochip_request/free_own_desc()
that do the same as gpio_request() but don't manipulate module refrence
count. This allows the GPIO chip driver to request and free descriptors it
owns without being pinned to the kernel forever.
Signed-off-by: NMika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: NAlexandre Courbot <acourbot@nvidia.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
      77c2d792
  5. 12 3月, 2014 6 次提交
  7. 11 3月, 2014 2 次提交
  9. 07 3月, 2014 4 次提交
  11. 06 3月, 2014 1 次提交
  13. 05 3月, 2014 2 次提交
    • A
      gpio: remove obsolete tnetv107x driver · de15011a
      由 Arnd Bergmann 提交于 
      The tnetv107x platform is getting removed, so this driver won't
be needed any more.
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Alexandre Courbot <gnurou@gmail.com>
Cc: linux-gpio@vger.kernel.org
Acked-by: NSekhar Nori <nsekhar@ti.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
      de15011a
    • J
      gpio: add a driver for the Synopsys DesignWare APB GPIO block · 7779b345
      由 Jamie Iles 提交于 
      The Synopsys DesignWare block is used in some ARM devices (picoxcell)
and can be configured to provide multiple banks of GPIO pins.

v12: - Add irq_startup/shutdown
     - do irq_create_mapping() in probe, irq_find_mapping() in to_irq()
     - Adjust mappings to show support for 1 gpio per port.
     - gpio-cells = <1>
v11: - Use NULL when checking existence of 'interrupts' property
     - Bindings descriptions cleanup
v10: - in documentation nr-gpio -> nr-gpios
v9:  - cleanup in dt bindings doc
     - use of_get_child_count()
v8:  - remove socfpga.dtsi changes
     - minor cleanup in devicetree documentation
v7:  - use irq_generic_chip
     - support one irq per gpio line or one irq for many
     - s/bank/port/ and other cleanup
v6:  - (atull) squash the set of patches
     - use linear irq domain
     - build fixes. Original driver was reviewed on v3.2.
     - Fix setting irq edge type for 'rising' and 'both'.
     - Support as a loadable module.
     - Use bgpio_chip's spinlock during register access.
     - Clean up register names to match spec
     - s/bank/port/ because register names use the word 'port'
     - s/nr-gpio/nr-gpios/
     - don't get/put the of_node
     - remove signoffs/acked-by's because of changes
     - other cleanup
v5:  - handle sparse bank population correctly
v3:  - depend on rather than select IRQ_DOMAIN
     - split IRQ support into a separate patch
v2:  - use Rob Herring's irqdomain in generic irq chip patches
     - use reg property to indicate bank index
     - support irqs on both edges based on LinusW's u300 driver
Signed-off-by: NJamie Iles <jamie@jamieiles.com>
Signed-off-by: NAlan Tull <atull@altera.com>
Reviewed-by: NSebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
      7779b345
  15. 04 3月, 2014 1 次提交
  17. 27 2月, 2014 3 次提交
  19. 24 2月, 2014 4 次提交
  21. 13 2月, 2014 10 次提交
  23. 12 2月, 2014 2 次提交