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Subject[PATCH 1/2] introduce ALS sysfs class
Date
From: Zhang Rui <rui.zhang@intel.com>

This is a refresh of the ALS sysfs class driver.

ALS sysfs class device provides a standard sysfs interface
for Ambient Light Sensor devices.

Only one sysfs I/F is introduced currently.
/sys/class/als/xxx/illuminance:
indicates the amount of light incident upon a specified surface area.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
Acked-by: Amit Kucheria <amit.kucheria@verdurent.com>
---
Documentation/ABI/testing/sysfs-class-als | 9 ++++
MAINTAINERS | 6 ++
drivers/Kconfig | 2 +
drivers/Makefile | 1 +
drivers/als/Kconfig | 10 ++++
drivers/als/Makefile | 5 ++
drivers/als/als_sys.c | 74 +++++++++++++++++++++++++++++
include/linux/als_sys.h | 35 ++++++++++++++
8 files changed, 142 insertions(+), 0 deletions(-)
create mode 100644 Documentation/ABI/testing/sysfs-class-als
create mode 100644 drivers/als/Kconfig
create mode 100644 drivers/als/Makefile
create mode 100644 drivers/als/als_sys.c
create mode 100644 include/linux/als_sys.h

diff --git a/Documentation/ABI/testing/sysfs-class-als b/Documentation/ABI/testing/sysfs-class-als
new file mode 100644
index 0000000..d3b33f3
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-class-als
@@ -0,0 +1,9 @@
+What: /sys/class/als/.../illuminance
+Date: Sep. 2009
+KernelVersion: 2.6.32
+Contact: Zhang Rui <rui.zhang@intel.com>
+Description: Current Ambient Light Illuminance reported by
+ native ALS driver
+ Unit: lux (lumens per square meter)
+ RO
+
diff --git a/MAINTAINERS b/MAINTAINERS
index c824b4d..0894a1c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -409,6 +409,12 @@ S: Maintained for 2.4; PCI support for 2.6.
L: linux-alpha@vger.kernel.org
F: arch/alpha/

+AMBIENT LIGHT SENSOR
+M: Zhang Rui <rui.zhang@intel.com>
+S: Supported
+F: include/linux/als_sys.h
+F: drivers/als/
+
AMD GEODE CS5536 USB DEVICE CONTROLLER DRIVER
M: Thomas Dahlmann <dahlmann.thomas@arcor.de>
L: linux-geode@lists.infradead.org (moderated for non-subscribers)
diff --git a/drivers/Kconfig b/drivers/Kconfig
index 48bbdbe..67cf884 100644
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -62,6 +62,8 @@ source "drivers/power/Kconfig"

source "drivers/hwmon/Kconfig"

+source "drivers/als/Kconfig"
+
source "drivers/thermal/Kconfig"

source "drivers/watchdog/Kconfig"
diff --git a/drivers/Makefile b/drivers/Makefile
index 6ee53c7..ecb6d5d 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -77,6 +77,7 @@ obj-$(CONFIG_PPS) += pps/
obj-$(CONFIG_W1) += w1/
obj-$(CONFIG_POWER_SUPPLY) += power/
obj-$(CONFIG_HWMON) += hwmon/
+obj-$(CONFIG_ALS) += als/
obj-$(CONFIG_THERMAL) += thermal/
obj-$(CONFIG_WATCHDOG) += watchdog/
obj-$(CONFIG_PHONE) += telephony/
diff --git a/drivers/als/Kconfig b/drivers/als/Kconfig
new file mode 100644
index 0000000..200c52b
--- /dev/null
+++ b/drivers/als/Kconfig
@@ -0,0 +1,10 @@
+#
+# Ambient Light Sensor sysfs device configuration
+#
+
+menuconfig ALS
+ tristate "Ambient Light Sensor sysfs device"
+ help
+ This framework provides a generic sysfs I/F for Ambient Light
+ Sensor devices.
+ If you want this support, you should say Y or M here.
diff --git a/drivers/als/Makefile b/drivers/als/Makefile
new file mode 100644
index 0000000..a527197
--- /dev/null
+++ b/drivers/als/Makefile
@@ -0,0 +1,5 @@
+#
+# Makefile for sensor chip drivers.
+#
+
+obj-$(CONFIG_ALS) += als_sys.o
diff --git a/drivers/als/als_sys.c b/drivers/als/als_sys.c
new file mode 100644
index 0000000..e1d6395
--- /dev/null
+++ b/drivers/als/als_sys.c
@@ -0,0 +1,74 @@
+/*
+ * als_sys.c - Ambient Light Sensor Sysfs support.
+ *
+ * Copyright (C) 2009 Intel Corp
+ * Copyright (C) 2009 Zhang Rui <rui.zhang@intel.com>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/kdev_t.h>
+
+MODULE_AUTHOR("Zhang Rui <rui.zhang@intel.com>");
+MODULE_DESCRIPTION("Ambient Light Sensor sysfs/class support");
+MODULE_LICENSE("GPL");
+
+static struct class *als_class;
+
+/**
+ * als_device_register - register a new Ambient Light Sensor class device
+ * @parent: the device to register.
+ *
+ * Returns the pointer to the new device
+ */
+struct device *als_device_register(struct device *dev, char *name)
+{
+ return device_create(als_class, dev, MKDEV(0, 0), NULL, name);
+}
+EXPORT_SYMBOL(als_device_register);
+
+/**
+ * als_device_unregister - removes the registered ALS class device
+ * @dev: the class device to destroy.
+ */
+void als_device_unregister(struct device *dev)
+{
+ device_unregister(dev);
+}
+EXPORT_SYMBOL(als_device_unregister);
+
+static int __init als_init(void)
+{
+ als_class = class_create(THIS_MODULE, "als");
+ if (IS_ERR(als_class)) {
+ printk(KERN_ERR "als_sys.c: couldn't create sysfs class\n");
+ return PTR_ERR(als_class);
+ }
+ return 0;
+}
+
+static void __exit als_exit(void)
+{
+ class_destroy(als_class);
+}
+
+subsys_initcall(als_init);
+module_exit(als_exit);
diff --git a/include/linux/als_sys.h b/include/linux/als_sys.h
new file mode 100644
index 0000000..500f300
--- /dev/null
+++ b/include/linux/als_sys.h
@@ -0,0 +1,35 @@
+/*
+ * als_sys.h
+ *
+ * Copyright (C) 2009 Intel Corp
+ * Copyright (C) 2009 Zhang Rui <rui.zhang@intel.com>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+#ifndef __ALS_SYS_H__
+#define __ALS_SYS_H__
+
+#include <linux/device.h>
+
+#define ALS_ILLUMINANCE_MIN 0
+#define ALS_ILLUMINANCE_MAX -1
+
+struct device *als_device_register(struct device *dev, char *name);
+void als_device_unregister(struct device *dev);
+
+#endif /* __ALS_SYS_H__ */
--
1.6.3.3


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