From: Mika Westerberg <mika.westerberg@linux.intel.com>
To: linux-kernel@vger.kernel.org
Cc: 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,
mathias.nyman@linux.intel.com,
Mika Westerberg <mika.westerberg@linux.intel.com>,
linux-acpi@vger.kernel.org
Subject: [PATCH 1/3] gpio / ACPI: add ACPI support
Date: Sat, 3 Nov 2012 09:46:31 +0200 [thread overview]
Message-ID: <1351928793-14375-2-git-send-email-mika.westerberg@linux.intel.com> (raw)
In-Reply-To: <1351928793-14375-1-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>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
drivers/gpio/Kconfig | 4 +++
drivers/gpio/Makefile | 1 +
drivers/gpio/gpiolib-acpi.c | 60 +++++++++++++++++++++++++++++++++++++++++++
include/linux/acpi_gpio.h | 19 ++++++++++++++
4 files changed, 84 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 d055cee..2f1905b 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -49,6 +49,10 @@ config OF_GPIO
def_bool y
depends on OF && !SPARC
+config ACPI_GPIO
+ 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..5254b6d 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_ACPI_GPIO) += 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..ef56ea4
--- /dev/null
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -0,0 +1,60 @@
+/*
+ * ACPI helpers for GPIO API
+ *
+ * Copyright (C) 2012, Intel Corporation
+ * Author: Mathias Nyman <mathias.nyman@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/module.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;
+ acpi_handle gc_handle;
+
+ if (!gc->dev)
+ return false;
+
+ gc_handle = gc->dev->acpi_handle;
+ if (!gc_handle)
+ return false;
+
+ return gc_handle == 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(acpi_get_gpio);
diff --git a/include/linux/acpi_gpio.h b/include/linux/acpi_gpio.h
new file mode 100644
index 0000000..e025664
--- /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_ACPI_GPIO
+
+int acpi_get_gpio(char *path, int pin);
+
+#else /* CONFIG_ACPI_GPIO */
+
+static inline int acpi_get_gpio(char *path, int pin)
+{
+ return -ENODEV;
+}
+
+#endif /* CONFIG_ACPI_GPIO */
+
+#endif /* _LINUX_ACPI_GPIO_H_ */
--
1.7.10.4
next prev parent reply other threads:[~2012-11-03 7:44 UTC|newest]
Thread overview: 119+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-03 7:46 [PATCH 0/3] ACPI 5 support for GPIO, SPI and I2C Mika Westerberg
2012-11-03 7:46 ` Mika Westerberg [this message]
2012-11-05 11:53 ` [PATCH 1/3] gpio / ACPI: add ACPI support Linus Walleij
2012-11-05 12:14 ` Mathias Nyman
2012-11-05 12:46 ` Rafael J. Wysocki
2012-11-05 13:11 ` Linus Walleij
2012-11-05 13:19 ` Rafael J. Wysocki
2012-11-05 13:28 ` Linus Walleij
2012-11-05 13:50 ` Rafael J. Wysocki
2012-11-05 14:40 ` Linus Walleij
2012-11-06 9:39 ` Mika Westerberg
2012-11-06 10:15 ` Linus Walleij
2012-11-07 8:54 ` Mika Westerberg
2012-11-08 15:55 ` Grant Likely
2012-11-08 19:38 ` Mika Westerberg
2012-11-09 14:11 ` Mathias Nyman
2012-11-09 14:18 ` Grant Likely
2012-11-09 15:05 ` Mathias Nyman
2012-11-09 15:46 ` Grant Likely
2012-11-11 9:50 ` Mika Westerberg
2012-11-03 7:46 ` [PATCH 2/3] spi / ACPI: add ACPI enumeration support Mika Westerberg
2012-11-03 19:42 ` Bjorn Helgaas
2012-11-03 20:13 ` Mika Westerberg
2012-11-03 20:59 ` Rafael J. Wysocki
2012-11-05 10:31 ` Rafael J. Wysocki
2012-11-05 10:56 ` Mika Westerberg
2012-11-05 10:56 ` Mark Brown
2012-11-05 12:02 ` Mika Westerberg
2012-11-05 12:23 ` Jean Delvare
2012-11-05 12:59 ` Rafael J. Wysocki
2012-11-05 13:15 ` Mika Westerberg
2012-11-05 13:20 ` Linus Walleij
2012-11-05 13:43 ` Mika Westerberg
2012-11-05 14:03 ` Jean Delvare
2012-11-05 14:19 ` Rafael J. Wysocki
2012-11-05 14:53 ` Mika Westerberg
2012-11-05 15:19 ` Jean Delvare
2012-11-05 17:12 ` Mika Westerberg
2012-11-05 17:43 ` Bjorn Helgaas
2012-11-05 18:08 ` Mika Westerberg
2012-11-05 17:49 ` Jean Delvare
2012-11-05 20:42 ` Linus Walleij
2012-11-06 8:11 ` Mark Brown
2012-11-05 16:54 ` Bjorn Helgaas
2012-11-06 13:43 ` Rafael J. Wysocki
2012-11-06 20:35 ` Bjorn Helgaas
2012-11-06 22:28 ` Rafael J. Wysocki
2012-11-06 22:36 ` Rafael J. Wysocki
2012-11-07 9:58 ` Mika Westerberg
2012-11-07 11:14 ` Rafael J. Wysocki
2012-11-07 13:05 ` Mika Westerberg
2012-11-08 0:46 ` Rafael J. Wysocki
2012-11-08 20:20 ` Mika Westerberg
2012-11-08 20:54 ` Rafael J. Wysocki
2012-11-08 18:05 ` Grant Likely
2012-11-08 21:06 ` Rafael J. Wysocki
2012-11-08 21:34 ` Grant Likely
2012-11-05 10:54 ` Mark Brown
2012-11-03 20:39 ` Rafael J. Wysocki
2012-11-05 16:54 ` Bjorn Helgaas
2012-11-06 13:16 ` Rafael J. Wysocki
2012-11-06 20:53 ` Bjorn Helgaas
2012-11-06 22:18 ` Rafael J. Wysocki
2012-11-07 9:56 ` Mika Westerberg
2012-11-08 19:32 ` Bjorn Helgaas
2012-11-08 20:04 ` Mika Westerberg
2012-11-09 15:11 ` Bjorn Helgaas
2012-11-09 15:45 ` Grant Likely
2012-11-09 16:35 ` Bjorn Helgaas
2012-11-09 16:43 ` Grant Likely
2012-11-09 16:48 ` Mark Brown
2012-11-09 16:53 ` Bjorn Helgaas
2012-11-10 11:10 ` Rafael J. Wysocki
2012-11-10 11:16 ` Grant Likely
2012-11-10 17:14 ` Bjorn Helgaas
2012-11-10 19:40 ` Rafael J. Wysocki
2012-11-05 10:54 ` Mark Brown
2012-11-05 11:03 ` Mika Westerberg
2012-11-05 11:13 ` Mark Brown
2012-11-08 18:48 ` Grant Likely
2012-11-09 3:50 ` Mika Westerberg
2012-11-03 7:46 ` [PATCH 3/3] i2c " Mika Westerberg
2012-11-03 21:52 ` Jean Delvare
2012-11-04 7:23 ` Mika Westerberg
2012-11-04 8:50 ` Jean Delvare
2012-11-04 10:50 ` Mika Westerberg
2012-11-08 18:58 ` Grant Likely
2012-11-09 3:51 ` Mika Westerberg
2012-11-04 18:29 ` [PATCH 0/3] ACPI 5 support for GPIO, SPI and I2C Linus Walleij
2012-11-05 9:23 ` Mika Westerberg
2012-11-12 11:51 ` [PATCH 0/3] Centralized parsing of ACPI device resources (was: Re: [PATCH 0/3] ACPI 5 support for GPIO, SPI and I2C) Rafael J. Wysocki
2012-11-12 12:00 ` [PATCH 1/3] ACPI: Move device resources interpretation code from PNP to ACPI core Rafael J. Wysocki
2012-11-12 13:27 ` Mika Westerberg
2012-11-12 20:25 ` [Update][PATCH " Rafael J. Wysocki
2012-11-12 12:01 ` [PATCH 2/3] ACPI / platform: Use common ACPI device resource parsing routines Rafael J. Wysocki
2012-11-12 12:02 ` [PATCH 3/3] ACPI: Evaluate _CRS while creating device node objects Rafael J. Wysocki
2012-11-12 14:46 ` Mika Westerberg
2012-11-12 21:03 ` Rafael J. Wysocki
2012-11-13 7:12 ` Mika Westerberg
2012-11-13 12:06 ` [Replacement][PATCH 3/3] Rafael J. Wysocki
2012-11-13 14:16 ` Mika Westerberg
2012-11-13 15:15 ` Rafael J. Wysocki
2012-11-13 15:18 ` Mika Westerberg
2012-11-13 15:28 ` Rafael J. Wysocki
2012-11-13 15:37 ` Mika Westerberg
2012-11-13 16:34 ` [PATCH 3/3] ACPI: Evaluate _CRS while creating device node objects Moore, Robert
2012-11-13 20:44 ` Rafael J. Wysocki
2012-11-13 22:06 ` Moore, Robert
2012-11-13 22:56 ` Rafael J. Wysocki
2012-11-14 2:23 ` Moore, Robert
2012-11-14 9:18 ` Rafael J. Wysocki
2012-11-14 9:32 ` Rafael J. Wysocki
2012-11-14 14:20 ` Moore, Robert
2012-11-13 20:51 ` [PATCH 0/3 rev 2] Centralized parsing of ACPI device resources Rafael J. Wysocki
2012-11-13 20:55 ` [PATCH 1/3 rev 2] ACPI: Move device resources interpretation code from PNP to ACPI core Rafael J. Wysocki
2012-11-13 20:55 ` [PATCH 2/3 rev 2] ACPI / platform: Use common ACPI device resource parsing routines Rafael J. Wysocki
2012-11-13 20:56 ` [PATCH 3/3 rev 2] ACPI: Centralized processing of ACPI device resources Rafael J. Wysocki
2012-11-14 9:52 ` [PATCH 0/3 rev 2] Centralized parsing " Mika Westerberg
2012-11-14 10:08 ` Rafael J. Wysocki
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