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| author | Hans de Goede <hdegoede@redhat.com> | 2017-06-12 22:55:46 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2017-06-15 00:55:44 +0200 |
| commit | 63dada87f7ef7d4a536765c816fbbe7c4b9f3c85 (patch) | |
| tree | d2e7dc3fa453fe4d67ed43a57ff7e9ec5495b1a2 /drivers/platform/x86/Kconfig | |
| parent | dc15e71eefc766373833602c353cf6b4f49da036 (diff) | |
| download | lwn-63dada87f7ef7d4a536765c816fbbe7c4b9f3c85.tar.gz lwn-63dada87f7ef7d4a536765c816fbbe7c4b9f3c85.zip | |
platform/x86: Add driver for ACPI INT0002 Virtual GPIO device
Some peripherals on Bay Trail and Cherry Trail platforms signal a
Power Management Event (PME) to the Power Management Controller (PMC)
to wakeup the system. When this happens software needs to explicitly
clear the PME bus 0 status bit in the GPE0a_STS register to avoid an
IRQ storm on IRQ 9.
This is modelled in ACPI through the INT0002 ACPI device, which is
called a "Virtual GPIO controller" in ACPI because it defines the
event handler to call when the PME triggers through _AEI and _L02
methods as would be done for a real GPIO interrupt in ACPI.
This commit adds a driver which registers the Virtual GPIOs expected
by the DSDT on these devices, letting gpiolib-acpi claim the
virtual GPIO and install a GPIO-interrupt handler which call the _L02
handler as it would for a real GPIO controller.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/platform/x86/Kconfig')
| -rw-r--r-- | drivers/platform/x86/Kconfig | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig index 8489020ecf44..a3ccc3c795a5 100644 --- a/drivers/platform/x86/Kconfig +++ b/drivers/platform/x86/Kconfig @@ -794,6 +794,25 @@ config INTEL_CHT_INT33FE This driver instantiates i2c-clients for these, so that standard i2c drivers for these chips can bind to the them. +config INTEL_INT0002_VGPIO + tristate "Intel ACPI INT0002 Virtual GPIO driver" + depends on GPIOLIB && ACPI + select GPIOLIB_IRQCHIP + ---help--- + Some peripherals on Bay Trail and Cherry Trail platforms signal a + Power Management Event (PME) to the Power Management Controller (PMC) + to wakeup the system. When this happens software needs to explicitly + clear the PME bus 0 status bit in the GPE0a_STS register to avoid an + IRQ storm on IRQ 9. + + This is modelled in ACPI through the INT0002 ACPI device, which is + called a "Virtual GPIO controller" in ACPI because it defines the + event handler to call when the PME triggers through _AEI and _L02 + methods as would be done for a real GPIO interrupt in ACPI. + + To compile this driver as a module, choose M here: the module will + be called intel_int0002_vgpio. + config INTEL_HID_EVENT tristate "INTEL HID Event" depends on ACPI |