summaryrefslogtreecommitdiffstats
path: root/drivers/gpio
Commit message (Collapse)AuthorAgeFilesLines
...
| * | | gpio: davinci: Remove redundant members davinci_gpio_controller stuctKeerthy2017-01-111-3/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | davinci_gpio_controller struct has set_data, in_data, clr_data members that are assigned and never used. Signed-off-by: Keerthy <j-keerthy@ti.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| * | | gpio: devres: Use global array of gpio suffixesAndy Shevchenko2017-01-091-4/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We have already a global array of possible GPIO suffixes. Use it here instead of another copy of them. Unfortunately this will not reduce the memory footprint, though allows to easy maintain list in only one place. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| * | | gpio: of: Add support for multiple GPIOs in a single GPIO hogGeert Uytterhoeven2016-12-301-11/+20
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When listing multiple GPIOs in the "gpios" property of a GPIO hog, only the first GPIO is affected. The user is left clueless about the dysfunctioning of the other GPIOs specified. Fix this by adding and documenting support for specifying multiple GPIOs in a single GPIO hog. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| * | | gpio: update my email addressJohn Crispin2016-12-303-3/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch updates my email address as I no longer have access to the old one. Signed-off-by: John Crispin <john@phrozen.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| * | | gpio: mockup: coding style fixesBartosz Golaszewski2016-12-281-7/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * | | gpio: mockup: dynamically allocate memory for chip nameBartosz Golaszewski2016-12-281-3/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * | | gpio: mockup: make pins_name_start staticBartosz Golaszewski2016-12-281-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * | | gpio: rcar: Fine-grained Runtime PM supportGeert Uytterhoeven2016-12-281-4/+16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently gpio modules are runtime-resumed at probe time. This means the gpio module will be active all the time (except during system suspend, if not configured as a wake-up source). While an R-Car Gen2 gpio module retains pins configured for output at the requested level while put in standby mode, gpio register cannot be accessed while suspended. Unfortunately pm_runtime_get_sync() cannot be called from all contexts where gpio register access is needed. Hence move the Runtime PM handling from probe/remove time to gpio request/free time, which is probably the best we can do. On r8a7791/koelsch, gpio modules 0, 1, 3, and 4 are now suspended during normal use (gpio2 is used for LEDs and regulators, gpio5 for keys, gpio6 for SD-Card CD & WP, gpio7 for keys and regulators). Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> [Niklas: s/gpio_to_priv(chip)/gpiochip_get_data(chip)/] Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| * | | gpio: rcar: set IRQ chip parent_deviceNiklas Söderlund2016-12-281-0/+1
| |/ / | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This enables Runtime PM handling for interrupts. By setting the parent_device in struct irq_chip genirq will call the pm_runtime_get/put APIs when an IRQ is requested/freed. Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* | | gpio: aspeed: Remove dependence on GPIOF_* macrosAndrew Jeffery2017-02-041-3/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 1736f75d35e47409ad776273133d0f558a4c8253 is a (v2) patch which had unresolved review comments[1]. Address the comments by removing the use of macros from the consumer header (this patch represents the diff between v2 and v3[2]). [1] https://lkml.org/lkml/2017/1/26/337 [2] https://lkml.org/lkml/2017/1/26/786 Fixes: 1736f75d35e4 ("gpio: aspeed: Add banks Y, Z, AA, AB and AC") Signed-off-by: Andrew Jeffery <andrew@aj.id.au> Acked-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* | | Merge tag 'v4.10-rc6' into develLinus Walleij2017-01-302-11/+11
|\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | Linux 4.10-rc6 Resolved conflicts in: drivers/pinctrl/pinctrl-amd.c drivers/pinctrl/samsung/pinctrl-exynos.c
| * | | gpio: provide lockdep keys for nested/unnested irqchipsLinus Walleij2017-01-191-9/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The helper function for adding a GPIO chip compiles in a lockdep key for debugging, the same key is needed for nested chips as well. The macro construction is unreadable, replace this with two static inlines instead. The _gpiochip_irqchip_add prefixed function is not helpful, rename it with gpiochip_irqchip_add_key() that tell us what the function is actually doing. Fixes: d245b3f9bd36 ("gpio: simplify adding threaded interrupts") Cc: Roger Quadros <rogerq@ti.com> Reported-by: Clemens Gruber <clemens.gruber@pqgruber.com> Reported-by: Roger Quadros <rogerq@ti.com> Reported-by: Grygorii Strashko <grygorii.strashko@ti.com> Tested-by: Clemens Gruber <clemens.gruber@pqgruber.com> Tested-by: Grygorii Strashko <grygorii.strashko@ti.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| * | | gpio: Move freeing of GPIO hogs before numbing of the deviceGeert Uytterhoeven2016-12-301-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When removing a gpiochip that uses GPIO hogging (e.g. by unloading the chip's DT overlay), a warning is printed: gpio gpiochip8: REMOVING GPIOCHIP WITH GPIOS STILL REQUESTED This happens because gpiochip_free_hogs() is called after the gdev->chip pointer is reset to NULL. Hence __gpiod_free() cannot determine the chip in use, and cannot clear flags nor call the optional chip-specific .free() callback. Move the call to gpiochip_free_hogs() up to fix this. Cc: stable@vger.kernel.org Fixes: ff2b135922992756 ("gpio: make the gpiochip a real device") Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| * | | gpio: mxs: remove __init annotationArnd Bergmann2016-12-301-1/+1
| |/ / | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Building with an old toolchain, I ran into this warning: WARNING: vmlinux.o(.text+0x63eef0): Section mismatch in reference from the function mxs_gpio_probe() to the function .init.text:mxs_gpio_init_gc() Clearly the annotation is wrong, since the function is called from the non-init probe, so let's remove it. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* | | Merge branch 'ib-pinctrl-genprops' into develLinus Walleij2017-01-2618-114/+211
|\ \ \ | | |/ | |/|
| * | pinctrl / gpio: Introduce .set_config() callback for GPIO chipsMika Westerberg2017-01-2618-114/+211
| |/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently we already have two pin configuration related callbacks available for GPIO chips .set_single_ended() and .set_debounce(). In future we expect to have even more, which does not scale well if we need to add yet another callback to the GPIO chip structure for each possible configuration parameter. Better solution is to reuse what we already have available in the generic pinconf. To support this, we introduce a new .set_config() callback for GPIO chips. The callback takes a single packed pin configuration value as parameter. This can then be extended easily beyond what is currently supported by just adding new types to the generic pinconf enum. If the GPIO driver is backed up by a pinctrl driver the GPIO driver can just assign gpiochip_generic_config() (introduced in this patch) to .set_config and that will take care configuration requests are directed to the pinctrl driver. We then convert the existing drivers over .set_config() and finally remove the .set_single_ended() and .set_debounce() callbacks. Suggested-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* | gpio: aspeed: Add banks Y, Z, AA, AB and ACAndrew Jeffery2017-01-261-14/+160
| | | | | | | | | | | | | | | | | | | | | | | | | | | | This is less straight-forward than one would hope, as some banks only have 4 pins rather than 8, others are output only, yet more (W and X, already supported) are input-only, and in the case of the g4 SoC bank AC doesn't exist. Add some structs to describe the varying properties of different banks and integrate mechanisms to deny requests for unsupported configurations. Signed-off-by: Andrew Jeffery <andrew@aj.id.au> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* | gpio: aspeed: Make bank names stringsJoel Stanley2017-01-261-7/+7
|/ | | | | | | | | | The Aspeed SoCs have more GPIOs than can be represented with A-Z. The documentation uses two letter names such as AA and AB, so make the names a three-character array in the bank struct to accommodate this. Signed-off-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Andrew Jeffery <andrew@aj.id.au> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* Merge tag 'mfd-for-linus-4.10' of ↵Linus Torvalds2016-12-191-1/+2
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd Pull MFD updates from Lee Jones: "New Device Support - Add support for Ricoh RC5T619 PMIC to rn5t618 - Add support for PM8821 PMIC to qcom-pm8xxx New Functionality: - Add support for GPIO to lpc_ich - Add support for GPADC to sun4i - Add ability for rk808 to shutdown Fix-ups: - Simplify/strip unnecessary code; tps65218, palmas, tps65217 - Device Tree binding updates; tps65218, altera-a10sr - Provide/export device ID info; tps65218, axp20x-i2c, hi655x-pmic, fsl-imx25-tsadc, intel_soc_pmic_bxtwc - Use MFD API instead of of_platform_populate(); tps65218 - Generalise name-space; pm8xxx - Supply/edit regmap configuration; axp20x, cs47l24-tables, axp20x - Enable compile testing; max77620, max77686, exynos-lpass, abx500-core - Coding style issues; wm8994-core, wm5102-tables - Supply endian support; syscon - Remove module support; ab3100-core, ab8500-debugfs, ab8500-gpadc, abx500-core Bug Fixes: - Fix ordering issues; wm8994 - Fix dependencies (build-time/run-time); exynos_lpass, sun4i-gpadc - Fix compiler warnings; sun4i-gpadc - Fix leaks; mfd-core - Fix page fault during module unload; tps65217" * tag 'mfd-for-linus-4.10' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd: (49 commits) mfd: tps65217: Support an interrupt pin as the system wakeup mfd: tps65217: Make an interrupt handler simpler mfd: tps65217: Update register interrupt mask bits instead of writing operation mfd: tps65217: Specify the IRQ name mfd: tps65217: Fix page fault on unloading modules mfd: palmas: Remove redundant check in palmas_power_off mfd: arizona: Disable IRQs during driver remove mfd: pm8xxx: add support to pm8821 mfd: intel-lpss: Try to enable Memory-Write-Invalidate mfd: rn5t618: Add Ricoh RC5T619 PMIC support mfd: axp20x: Add address extension registers for AXP806 regmap mfd: intel_soc_pmic_bxtwc: Fix a typo in MODULE_DEVICE_TABLE() mfd: core: Fix device reference leak in mfd_clone_cell mfd: bcm590xx: Simplify a test mfd: sun4i-gpadc: Select regmap-irq mfd: abx500-core: drop unused MODULE_ tags from non-modular code mfd: ab8500: make sysctrl explicitly non-modular mfd: ab8500-gpadc: Make it explicitly non-modular mfd: ab8500-debugfs: Make it explicitly non-modular mfd: ab8500-core: Make it explicitly non-modular ...
| * mfd: tps65218: Remove redundant read wrapperKeerthy2016-10-261-1/+2
| | | | | | | | | | | | | | | | | | Currently read directly calls the repmap read function. Hence remove the redundant wrapper and use regmap read wherever needed. Signed-off-by: Keerthy <j-keerthy@ti.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
* | Merge tag 'gpio-v4.10-1' of ↵Linus Torvalds2016-12-1331-1152/+670
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio Pull GPIO updates from Luinus Walleij: "Bulk GPIO changes for the v4.10 kernel cycle: Core changes: - Simplify threaded interrupt handling: instead of passing numbed parameters to gpiochip_irqchip_add_chained() we create a new call: gpiochip_irqchip_add_nested() so the two types are clearly semantically different. Also make sure that all nested chips call gpiochip_set_nested_irqchip() which is necessary for IRQ resend to work properly if it happens. - Return error on seek operations for the chardev. - Clamp values set as part of gpio[d]_direction_output() so that anything != 0 will be send down to the driver as "1" not the value passed in. - ACPI can now support naming of GPIO lines, hogs and holes in the GPIO lists. New drivers: - The SX150x driver was deemed unfit for the GPIO subsystem and was moved over to a combined GPIO+pinctrl driver in the pinctrl subsystem. New features: - Various cleanups to various drivers" * tag 'gpio-v4.10-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio: (49 commits) gpio: merrifield: Implement gpio_get_direction callback gpio: merrifield: Add support for hardware debouncer gpio: chardev: Return error for seek operations gpio: arizona: Tidy up probe error path gpio: arizona: Remove pointless set of platform drvdata gpio: pl061: delete platform data handling gpio: pl061: move platform data into driver gpio: pl061: rename variable from chip to pl061 gpio: pl061: rename state container struct gpio: pl061: use local state for parent IRQ storage gpio: set explicit nesting on drivers gpio: simplify adding threaded interrupts gpio: vf610: use builtin_platform_driver gpio: axp209: use correct register for GPIO input status gpio: stmpe: fix interrupt handling bug gpio: em: depnd on ARCH_SHMOBILE gpio: zx: depend on ARCH_ZX gpio: x86: update config dependencies for x86 specific hardware gpio: mb86s7x: use builtin_platform_driver gpio: etraxfs: use builtin_platform_driver ...
| * \ Merge branch 'thread-irq-simpler' into develLinus Walleij2016-12-0711-72/+117
| |\ \
| | * | gpio: set explicit nesting on driversLinus Walleij2016-11-253-0/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The ADNP, CrystalCove and WhiskeyCove are all nested GPIO irqchips, but were avoiding to connect the parent IRQ to the gpiochip. This works, but is kind of sloppy as the child IRQs are not marked as having the parent IRQ as parent. Cc: Mika Westerberg <mika.westerberg@linux.intel.com> Cc: Ajay Thomas <ajay.thomas.david.rajamanickam@intel.com> Cc: Bin Gao <bin.gao@linux.intel.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| | * | gpio: simplify adding threaded interruptsLinus Walleij2016-11-2511-72/+111
| | |/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This tries to simplify the use of CONFIG_GPIOLIB_IRQCHIP when using threaded interrupts: add a new call gpiochip_irqchip_add_nested() to indicate that we're dealing with a nested rather than a chained irqchip, then create a separate gpiochip_set_nested_irqchip() to mirror the gpiochip_set_chained_irqchip() call to connect the parent and child interrupts. In the nested case gpiochip_set_nested_irqchip() does nothing more than call irq_set_parent() on each valid child interrupt, which has little semantic effect in the kernel, but this is probably still formally correct. Update all drivers using nested interrupts to use gpiochip_irqchip_add_nested() so we can now see clearly which these users are. The DLN2 driver can drop its specific hack with .irq_not_threaded as we now recognize whether a chip is threaded or not from its use of gpiochip_irqchip_add_nested() signature rather than from inspecting .can_sleep. We rename the .irq_parent to .irq_chained_parent since this parent IRQ is only really kept around for the chained interrupt handlers. Cc: Lars Poeschel <poeschel@lemonage.de> Cc: Octavian Purdila <octavian.purdila@intel.com> Cc: Daniel Baluta <daniel.baluta@intel.com> Cc: Bin Gao <bin.gao@linux.intel.com> Cc: Mika Westerberg <mika.westerberg@linux.intel.com> Cc: Ajay Thomas <ajay.thomas.david.rajamanickam@intel.com> Cc: Semen Protsenko <semen.protsenko@globallogic.com> Cc: Alexander Stein <alexander.stein@systec-electronic.com> Cc: Phil Reid <preid@electromag.com.au> Cc: Bartosz Golaszewski <bgolaszewski@baylibre.com> Cc: Patrice Chotard <patrice.chotard@st.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| * | Merge branch 'pl061' into develLinus Walleij2016-12-071-114/+94
| |\ \
| | * | gpio: pl061: delete platform data handlingLinus Walleij2016-12-071-38/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Platform data is a remnant of board files and all boards using the PL061 have been migrated to use device tree or ACPI instead. The custom mechanism to set line by default as inputs/outputs has been superceded by the GPIO-internal hogging mechanism. Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| | * | gpio: pl061: move platform data into driverLinus Walleij2016-12-071-1/+13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | No boardfile defines any PL061 platform data anymore: the Integrator IM/PD-1 includes the file but is not making use of the struct. Let's delete the include and all references, then move the platform data into the driver for later consolidation into the driver state container. The only resource defined by the IM/PD-1 is the IRQ which is passed through the AMBA PrimeCell bus abstraction struct amba_device. Cc: arm@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: Russell King <linux@armlinux.org.uk> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| | * | gpio: pl061: rename variable from chip to pl061Linus Walleij2016-12-071-93/+93
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Rename the local variable "chip" referring to the struct pl061 state container to "pl061": we already have gpio_chip and irq_chip in the driver, we are needlessly adding yet another "chip" to the confusion. Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| | * | gpio: pl061: rename state container structLinus Walleij2016-12-071-15/+15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | The PL061 state container is named "pl061_gpio", let's rename it to simply pl061. Less is more. Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| | * | gpio: pl061: use local state for parent IRQ storageLinus Walleij2016-12-071-1/+4
| | |/ | | | | | | | | | | | | | | | | | | The driver is poking around in the struct gpio_chip internals, which is a no-no. Use a variable in the local state container. Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| * | gpio: merrifield: Implement gpio_get_direction callbackAndy Shevchenko2016-12-071-0/+9
| | | | | | | | | | | | | | | | | | | | | Implement gpio_get_direction() callback for Intel Merrifield GPIO. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| * | gpio: merrifield: Add support for hardware debouncerAndy Shevchenko2016-12-071-0/+22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | By default all pins are configured to use a glitch filter. Writing 1 to the certain bit of the specific register might be useful in case someone needs to bypass the glitch filter completely for a given GPIO pin. This patch adds support for that in the Intel Merrifield GPIO driver. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| * | gpio: chardev: Return error for seek operationsLars-Peter Clausen2016-12-071-2/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The GPIO chardev is used for management tasks (allocating line and event handles) and does neither support read() nor write() operations. Hence it does not make much sense to allow seek operations. Currently the chardev uses noop_llseek() for its seek implementation. This function does not move the pointer and simply returns the current position (always 0 for the GPIO chardev). noop_llseek() is primarily meant for devices that can not support seek, but where there might be a user that depends on the seek() operation succeeding. For newly added devices that can not support seek operations it is recommended to use no_llseek(), which will return an error. For more information see commit 6038f373a3dc ("llseek: automatically add .llseek fop"). Unfortunately this was overlooked when the GPIO chardev ABI was introduced. But it is highly unlikely that since then userspace applications have appeared that rely on being able to perform non-failing seek operations on a GPIO chardev file descriptor. So it should be safe to change from noop_llseel() to no_seek(). Also use nonseekable_open() in the chardev open() callback to clear the FMODE_SEEK, FMODE_PREAD and FMODE_PWRITE flags from the file. Neither of these should be set on a file that does not support seek operations. Cc: stable@vger.kernel.org Fixes: 3c702e9987e2 ("gpio: add a userspace chardev ABI for GPIOs") Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| * | gpio: arizona: Tidy up probe error pathCharles Keepax2016-12-071-5/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | There is some unnecessary complexity in the error path which now things are converted to devm is actually very simple. This patch simplifies things. Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| * | gpio: arizona: Remove pointless set of platform drvdataCharles Keepax2016-12-071-2/+0
| | | | | | | | | | | | | | | | | | | | | | | | We use the gpio chip private data in all the callbacks so remove this redundant line of code. Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| * | gpio: vf610: use builtin_platform_driverGeliang Tang2016-11-241-5/+1
| | | | | | | | | | | | | | | | | | | | | Use builtin_platform_driver() helper to simplify the code. Signed-off-by: Geliang Tang <geliangtang@gmail.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| * | gpio: axp209: use correct register for GPIO input statusQuentin Schulz2016-11-241-6/+2
| | | | | | | | | | | | | | | | | | | | | | | | The GPIO input status was read from control register (AXP20X_GPIO[210]_CTRL) instead of status register (AXP20X_GPIO20_SS). Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| * | gpio: stmpe: fix interrupt handling bugLinus Walleij2016-11-241-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | commit 43db289d00c6 ("gpio: stmpe: Rework registers access") reworked the STMPE register access so as to use [STMPE_IDX_*_LSB + i] to access the 8bit register for a certain bank, assuming the CSB and MSB will follow after the enumerator. For this to work the index needs to go from (size-1) to 0 not 0 to (size-1). However for the GPIO IRQ handler, the status registers we read register MSB + 3 bytes ahead for the 24 bit GPIOs and index registers from MSB upwards and run an index i over the registers UNLESS we are STMPE1600. This is not working when we get to clearing the interrupt EDGE status register STMPE_IDX_GPEDR_[LCM]SB: it is indexed like all other registers [STMPE_IDX_*_LSB + i] but in this loop we index from 0 to get the right bank index for the calculations, and we need to just add i to the MSB. Before this, interrupts on the STMPE2401 were broken, this patch fixes it so it works again. Cc: stable@vger.kernel.org Cc: Patrice Chotard <patrice.chotard@st.com> Fixes: 43db289d00c6 ("gpio: stmpe: Rework registers access") Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| * | gpio: em: depnd on ARCH_SHMOBILEPeter Robinson2016-11-241-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | The GPIO_EM is part of the Renesas SoCs so depend on the arch. Signed-off-by: Peter Robinson <pbrobinson@gmail.com> [Changed to depend on ARCH_EMEV2] Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| * | gpio: zx: depend on ARCH_ZXPeter Robinson2016-11-221-0/+1
| | | | | | | | | | | | | | | | | | | | | Set GPIO_ZX to depend on ARCH_ZX as it's SOC specific. Signed-off-by: Peter Robinson <pbrobinson@gmail.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| * | gpio: x86: update config dependencies for x86 specific hardwarePeter Robinson2016-11-221-5/+8
| | | | | | | | | | | | | | | | | | | | | The devices here are specific to x86 so lets depend on x86. Signed-off-by: Peter Robinson <pbrobinson@gmail.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| * | gpio: mb86s7x: use builtin_platform_driverGeliang Tang2016-11-221-5/+1
| | | | | | | | | | | | | | | | | | | | | Use builtin_platform_driver() helper to simplify the code. Signed-off-by: Geliang Tang <geliangtang@gmail.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| * | gpio: etraxfs: use builtin_platform_driverGeliang Tang2016-11-221-6/+1
| | | | | | | | | | | | | | | | | | | | | Use builtin_platform_driver() helper to simplify the code. Signed-off-by: Geliang Tang <geliangtang@gmail.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| * | gpio: max77620: add compatible string to device id listVenkat Reddy Talla2016-11-161-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | Adding max20024 compatible string to the device id list to support both max77620 and max20024 devices. Signed-off-by: Venkat Reddy Talla <vreddytalla@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| * | gpio: intel-mid: use builtin_pci_driverGeliang Tang2016-11-151-6/+1
| | | | | | | | | | | | | | | | | | | | | Use builtin_pci_driver() helper to simplify the code. Signed-off-by: Geliang Tang <geliangtang@gmail.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| * | gpio: tag line labels used for interruptsLinus Walleij2016-11-151-2/+18
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When a GPIO line is marked as used for an interrupt, it is helpful to set the label to "interrupt" so we know what is going on when inspecting the lines. If a GPIO is already properly named by gpiod_get*() we don't need to do this. It only happens when a line is used from the irqchip side of a GPIO driver without communicating with the GPIO side, such as when gpiochip is used as interrupt provider in the device tree. If the line is still marked as used by "interrupt" when we unmark it as used by an interrupt, also remove this label from the descriptor. Also shape up the code around unmarking IRQ lines. Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| * | gpio: clamp values on gpio[d]_direction_output()Linus Walleij2016-11-151-5/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | I saw weird values != [0,1] being passed down to drivers in their .set_direction_output() callbacks. Go over the gpiolib and make sure to hammer it to [0,1] before hitting the driver to avoid undesired side effects. Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| * | gpio: htc-egpio: read output value from cacheLinus Walleij2016-11-131-4/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | When the hardware is in output mode, reading the value from the hardware is not giving the correct value back. Instead read the value from the cache so we get the right value. Suggested-by: Russell King <linux@arm.linux.org.uk> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| * | gpio: htc-egpio: add .get_direction() supportLinus Walleij2016-11-121-0/+10
| | | | | | | | | | | | | | | | | | | | | | | | This makes is possible to read out the current direction of a GPIO line on the HTC CPLD GPIO expander. Suggested-by: Russell King <linux@arm.linux.org.uk> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| * | ACPI / gpio: avoid warning for gpio hogging codeArnd Bergmann2016-11-091-4/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The newly added acpi_gpiochip_scan_gpios function produces a few harmless warnings: drivers/gpio/gpiolib-acpi.c: In function ‘acpi_gpiochip_add’: drivers/gpio/gpiolib-acpi.c:925:7: error: ‘dflags’ may be used uninitialized in this function [-Werror=maybe-uninitialized] drivers/gpio/gpiolib-acpi.c:925:9: error: ‘lflags’ may be used uninitialized in this function [-Werror=maybe-uninitialized] The problem is that he compiler cannot know that a negative return value from fwnode_property_read_u32_array() or acpi_gpiochip_pin_to_gpio_offset() implies that the IS_ERR(gpio_desc) is true, as the value could in theory be below -MAX_ERRNO. The function already initializes its output values to zero, and moving that intialization a little higher up ensures that we can never have uninitialized data in the caller. Fixes: c80f1ba75df2 ("ACPI / gpio: Add hogging support") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>