From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: linux-kernel@vger.kernel.org, lenb@kernel.org,
rafael.j.wysocki@intel.com, broonie@opensource.wolfsonmicro.com,
grant.likely@secretlab.ca, linus.walleij@linaro.org,
khali@linux-fr.org, ben-linux@fluff.org, w.sang@pengutronix.de,
bhelgaas@google.com, mathias.nyman@linux.intel.com,
linux-acpi@vger.kernel.org
Subject: Re: [PATCH v2 1/3] gpio / ACPI: add ACPI support
Date: Fri, 16 Nov 2012 02:34:22 +0100 [thread overview]
Message-ID: <3699628.UkRaSOtjaA@vostro.rjw.lan> (raw)
In-Reply-To: <1352977397-2280-2-git-send-email-mika.westerberg@linux.intel.com>
On Thursday, November 15, 2012 01:03:15 PM Mika Westerberg wrote:
> From: Mathias Nyman <mathias.nyman@linux.intel.com>
>
> 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 <mathias.nyman@linux.intel.com>
> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
> ---
> drivers/gpio/Kconfig | 4 ++++
> drivers/gpio/Makefile | 1 +
> drivers/gpio/gpiolib-acpi.c | 56 +++++++++++++++++++++++++++++++++++++++++++
> include/linux/acpi_gpio.h | 19 +++++++++++++++
> 4 files changed, 80 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..8ef9831
> --- /dev/null
> +++ b/drivers/gpio/gpiolib-acpi.c
> @@ -0,0 +1,56 @@
> +/*
> + * ACPI helpers for GPIO API
> + *
> + * Copyright (C) 2012, Intel Corporation
> + * Authors: Mathias Nyman <mathias.nyman@linux.intel.com>
> + * Mika Westerberg <mika.westerberg@linux.intel.com>
> + *
> + * 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 <linux/errno.h>
> +#include <linux/gpio.h>
> +#include <linux/export.h>
> +#include <linux/acpi_gpio.h>
> +#include <linux/acpi.h>
> +
> +static int acpi_gpiochip_find(struct gpio_chip *gc, void *data)
> +{
> + acpi_handle handle = data;
> +
> + if (!gc->dev)
> + return false;
> +
> + return gc->dev->acpi_handle == handle;
I'd prefer DEVICE_ACPI_HANDLE() to be used in such places, we may want to
replace it with something else in the future or make it work differently.
> +}
> +
> +/**
> + * 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 <linux/errno.h>
> +
> +#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_ */
>
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
next prev parent reply other threads:[~2012-11-16 1:30 UTC|newest]
Thread overview: 89+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-15 11:03 [PATCH v2 0/3] ACPI 5 support for GPIO, SPI and I2C Mika Westerberg
2012-11-15 11:03 ` [PATCH v2 1/3] gpio / ACPI: add ACPI support Mika Westerberg
2012-11-16 1:34 ` Rafael J. Wysocki [this message]
2012-11-16 6:54 ` Mika Westerberg
2012-11-16 8:05 ` Mika Westerberg
2012-11-16 8:12 ` Mika Westerberg
2012-11-16 10:02 ` Rafael J. Wysocki
2012-11-16 12:49 ` Mika Westerberg
2012-11-16 10:03 ` Rafael J. Wysocki
2012-11-15 11:03 ` [PATCH v2 2/3] spi / ACPI: add ACPI enumeration support Mika Westerberg
2012-11-16 10:06 ` Rafael J. Wysocki
2012-11-17 10:11 ` Rafael J. Wysocki
2012-11-17 10:18 ` Mika Westerberg
2012-11-15 11:03 ` [PATCH v2 3/3] i2c " Mika Westerberg
2012-11-16 10:09 ` Rafael J. Wysocki
2012-11-16 13:03 ` Jean Delvare
2012-11-16 13:21 ` Rafael J. Wysocki
2012-11-16 13:42 ` Jean Delvare
2012-11-16 14:17 ` Mika Westerberg
2012-11-16 15:23 ` Mika Westerberg
2012-11-16 16:47 ` Jean Delvare
2012-11-16 17:28 ` [PATCH v2 3/3 UPDATED] " Mika Westerberg
2012-11-16 18:12 ` Jean Delvare
2012-11-17 6:46 ` Bjorn Helgaas
2012-11-17 8:03 ` Mika Westerberg
2012-11-17 9:55 ` Mika Westerberg
2012-11-19 22:49 ` Bjorn Helgaas
2012-11-19 23:15 ` Rafael J. Wysocki
2012-11-19 23:28 ` Rafael J. Wysocki
2012-11-20 7:07 ` Mika Westerberg
2012-11-17 11:24 ` Rafael J. Wysocki
2012-11-18 15:55 ` Mika Westerberg
2012-11-18 21:10 ` [PATCH 0/2] ACPI: Simplify "glueing" to physical nodes (was: Re: [PATCH v2 3/3 UPDATED] i2c / ACPI: add ACPI enumeration support) Rafael J. Wysocki
2012-11-18 21:12 ` [PATCH 1/2] ACPI: Allow ACPI handles of devices to be initialized in advance Rafael J. Wysocki
2012-11-19 9:42 ` Mika Westerberg
2012-11-19 12:33 ` [Update][PATCH " Rafael J. Wysocki
2012-11-18 21:13 ` [PATCH 2/2] ACPI / platform: Initialize ACPI handles of platform devices " Rafael J. Wysocki
2012-11-19 16:23 ` Greg Kroah-Hartman
2012-11-19 17:32 ` Rafael J. Wysocki
2012-11-19 17:45 ` Rafael J. Wysocki
2012-11-19 20:44 ` Rafael J. Wysocki
2012-11-19 21:05 ` Mika Westerberg
2012-11-19 21:56 ` Rafael J. Wysocki
2012-11-19 22:32 ` Greg Kroah-Hartman
2012-11-19 22:44 ` Rafael J. Wysocki
2012-11-19 18:25 ` Rafael J. Wysocki
2012-11-19 22:31 ` Greg Kroah-Hartman
2012-11-19 22:45 ` Rafael J. Wysocki
2012-11-20 0:55 ` [Update][PATCH 0/3] ACPI: Simplify "glueing" to physical nodes Rafael J. Wysocki
2012-11-20 0:57 ` [Update][PATCH 1/3] ACPI: Allow ACPI handles of devices to be initialized in advance Rafael J. Wysocki
2012-11-20 0:59 ` [Update][PATCH 2/3] ACPI / driver core: Introduce struct acpi_dev_node and related macros Rafael J. Wysocki
2012-11-20 9:10 ` Mika Westerberg
2012-11-20 9:34 ` [Update 2][PATCH " Rafael J. Wysocki
2012-11-20 12:57 ` Mika Westerberg
2012-11-20 18:08 ` Greg Kroah-Hartman
2012-11-20 1:01 ` [Update][PATCH 3/3] ACPI / platform: Initialize ACPI handles of platform devices in advance Rafael J. Wysocki
2012-11-20 18:08 ` Greg Kroah-Hartman
2012-11-20 9:11 ` [Update][PATCH 0/3] ACPI: Simplify "glueing" to physical nodes Mika Westerberg
2012-11-20 9:31 ` Rafael J. Wysocki
2012-11-20 18:09 ` Greg Kroah-Hartman
2012-11-20 21:40 ` Rafael J. Wysocki
2012-11-16 20:02 ` [PATCH v2 3/3] i2c / ACPI: add ACPI enumeration support Rafael J. Wysocki
2012-11-16 20:09 ` Mika Westerberg
2012-11-16 20:18 ` Rafael J. Wysocki
2012-11-20 10:29 ` [PATCH v3 0/3] ACPI 5 support for GPIO, SPI and I2C Mika Westerberg
2012-11-20 10:29 ` [PATCH v3 1/3] gpio / ACPI: add ACPI support Mika Westerberg
2012-11-20 12:46 ` Rafael J. Wysocki
2012-11-20 10:29 ` [PATCH v3 2/3] spi / ACPI: add ACPI enumeration support Mika Westerberg
2012-11-20 13:05 ` Rafael J. Wysocki
2012-11-20 13:15 ` Mika Westerberg
2012-11-20 13:24 ` Rafael J. Wysocki
2012-11-20 10:29 ` [PATCH v3 3/3] i2c " Mika Westerberg
2012-11-20 13:06 ` Rafael J. Wysocki
2012-11-20 13:57 ` Mika Westerberg
2012-11-20 18:13 ` [PATCH v4 0/3] ACPI 5 support for GPIO, SPI and I2C Mika Westerberg
2012-11-20 18:13 ` [PATCH v4 1/3] gpio / ACPI: add ACPI support Mika Westerberg
2012-11-30 11:20 ` Grant Likely
2012-11-30 11:27 ` Rafael J. Wysocki
2012-11-20 18:13 ` [PATCH v4 2/3] spi / ACPI: add ACPI enumeration support Mika Westerberg
2012-11-30 11:24 ` Grant Likely
2012-11-30 11:36 ` Rafael J. Wysocki
2012-11-20 18:13 ` [PATCH v4 3/3] i2c " Mika Westerberg
2012-11-21 21:31 ` [PATCH v4 0/3] ACPI 5 support for GPIO, SPI and I2C Rafael J. Wysocki
2012-11-21 21:54 ` Jean Delvare
2012-11-23 11:39 ` Rafael J. Wysocki
2012-11-22 1:36 ` Mark Brown
2012-11-22 9:43 ` Linus Walleij
2012-11-22 10:03 ` Rafael J. Wysocki
2012-11-28 12:36 ` Mika Westerberg
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