From: Mika Westerberg <mika.westerberg@linux.intel.com>
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 <mika.westerberg@linux.intel.com>
Subject: [PATCH v3 1/3] gpio / ACPI: add ACPI support
Date: Tue, 20 Nov 2012 12:29:42 +0200 [thread overview]
Message-ID: <1353407384-26880-2-git-send-email-mika.westerberg@linux.intel.com> (raw)
In-Reply-To: <1353407384-26880-1-git-send-email-mika.westerberg@linux.intel.com>
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..8285144
--- /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 ACPI_HANDLE(gc->dev) == handle;
+}
+
+/**
+ * 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_ */
--
1.7.10.4
next prev parent reply other threads:[~2012-11-20 10:26 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
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 ` Mika Westerberg [this message]
2012-11-20 12:46 ` [PATCH v3 1/3] gpio / ACPI: add ACPI support 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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