From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753547Ab2KTSKT (ORCPT ); Tue, 20 Nov 2012 13:10:19 -0500 Received: from mga02.intel.com ([134.134.136.20]:23717 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753211Ab2KTSKR (ORCPT ); Tue, 20 Nov 2012 13:10:17 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.83,287,1352102400"; d="scan'208";a="222258555" From: Mika Westerberg To: grant.likely@secretlab.ca, linus.walleij@linaro.org, w.sang@pengutronix.de, rafael.j.wysocki@intel.com Cc: linux-kernel@vger.kernel.org, lenb@kernel.org, broonie@opensource.wolfsonmicro.com, khali@linux-fr.org, ben-linux@fluff.org, bhelgaas@google.com, mathias.nyman@linux.intel.com, linux-acpi@vger.kernel.org, Mika Westerberg Subject: [PATCH v4 1/3] gpio / ACPI: add ACPI support Date: Tue, 20 Nov 2012 20:13:30 +0200 Message-Id: <1353435212-15325-2-git-send-email-mika.westerberg@linux.intel.com> X-Mailer: git-send-email 1.7.9.1 In-Reply-To: <1353435212-15325-1-git-send-email-mika.westerberg@linux.intel.com> References: <1353407384-26880-1-git-send-email-mika.westerberg@linux.intel.com> <1353435212-15325-1-git-send-email-mika.westerberg@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Mathias Nyman Add support for translating ACPI GPIO pin numbers to Linux GPIO API pins. Needs a gpio controller driver with the acpi handler hook set. Drivers can use acpi_get_gpio() to translate ACPI5 GpioIO and GpioInt resources to Linux GPIO's. Signed-off-by: Mathias Nyman Signed-off-by: Mika Westerberg --- drivers/gpio/Kconfig | 4 ++++ drivers/gpio/Makefile | 1 + drivers/gpio/gpiolib-acpi.c | 54 +++++++++++++++++++++++++++++++++++++++++++ include/linux/acpi_gpio.h | 19 +++++++++++++++ 4 files changed, 78 insertions(+) create mode 100644 drivers/gpio/gpiolib-acpi.c create mode 100644 include/linux/acpi_gpio.h diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index f11d8e3..5c9b384 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -49,6 +49,10 @@ config OF_GPIO def_bool y depends on OF +config GPIO_ACPI + def_bool y + depends on ACPI + config DEBUG_GPIO bool "Debug GPIO calls" depends on DEBUG_KERNEL diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 9aeed67..420dbac 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -4,6 +4,7 @@ ccflags-$(CONFIG_DEBUG_GPIO) += -DDEBUG obj-$(CONFIG_GPIOLIB) += gpiolib.o devres.o obj-$(CONFIG_OF_GPIO) += gpiolib-of.o +obj-$(CONFIG_GPIO_ACPI) += gpiolib-acpi.o # Device drivers. Generally keep list sorted alphabetically obj-$(CONFIG_GPIO_GENERIC) += gpio-generic.o diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c new file mode 100644 index 0000000..cbad6e9 --- /dev/null +++ b/drivers/gpio/gpiolib-acpi.c @@ -0,0 +1,54 @@ +/* + * ACPI helpers for GPIO API + * + * Copyright (C) 2012, Intel Corporation + * Authors: Mathias Nyman + * Mika Westerberg + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include +#include +#include +#include + +static int acpi_gpiochip_find(struct gpio_chip *gc, void *data) +{ + if (!gc->dev) + return false; + + return ACPI_HANDLE(gc->dev) == data; +} + +/** + * acpi_get_gpio() - Translate ACPI GPIO pin to GPIO number usable with GPIO API + * @path: ACPI GPIO controller full path name, (e.g. "\\_SB.GPO1") + * @pin: ACPI GPIO pin number (0-based, controller-relative) + * + * Returns GPIO number to use with Linux generic GPIO API, or errno error value + */ + +int acpi_get_gpio(char *path, int pin) +{ + struct gpio_chip *chip; + acpi_handle handle; + acpi_status status; + + status = acpi_get_handle(NULL, path, &handle); + if (ACPI_FAILURE(status)) + return -ENODEV; + + chip = gpiochip_find(handle, acpi_gpiochip_find); + if (!chip) + return -ENODEV; + + if (!gpio_is_valid(chip->base + pin)) + return -EINVAL; + + return chip->base + pin; +} +EXPORT_SYMBOL_GPL(acpi_get_gpio); diff --git a/include/linux/acpi_gpio.h b/include/linux/acpi_gpio.h new file mode 100644 index 0000000..91615a3 --- /dev/null +++ b/include/linux/acpi_gpio.h @@ -0,0 +1,19 @@ +#ifndef _LINUX_ACPI_GPIO_H_ +#define _LINUX_ACPI_GPIO_H_ + +#include + +#ifdef CONFIG_GPIO_ACPI + +int acpi_get_gpio(char *path, int pin); + +#else /* CONFIG_GPIO_ACPI */ + +static inline int acpi_get_gpio(char *path, int pin) +{ + return -ENODEV; +} + +#endif /* CONFIG_GPIO_ACPI */ + +#endif /* _LINUX_ACPI_GPIO_H_ */ -- 1.7.10.4