Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753067AbZIAH2B (ORCPT ); Tue, 1 Sep 2009 03:28:01 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752852AbZIAH2B (ORCPT ); Tue, 1 Sep 2009 03:28:01 -0400 Received: from mga11.intel.com ([192.55.52.93]:43268 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752819AbZIAH2A (ORCPT ); Tue, 1 Sep 2009 03:28:00 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.44,311,1249282800"; d="scan'208";a="722782441" Subject: [PATCH V6 1/2] introduce ALS sysfs class From: Zhang Rui To: Len Brown Cc: Linux Kernel Mailing List , linux-acpi , Greg KH , Pavel Machek , "Zhang, Rui" Content-Type: text/plain; charset=UTF-8 Date: Tue, 01 Sep 2009 15:25:47 +0800 Message-Id: <1251789947.3483.215.camel@rzhang-dt> Mime-Version: 1.0 X-Mailer: Evolution 2.22.1 (2.22.1-2.fc9) Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 11371 Lines: 386 Introduce ALS sysfs class. ALS sysfs class provides a standard sysfs interface for Ambient Light Sensor devices. please read Documentation/ABI/testing/sysfs-class-als for detailed sysfs designs. CC: Pavel Machek Acked-by: Greg Kroah-Hartman Signed-off-by: Zhang Rui --- Documentation/ABI/testing/sysfs-class-als | 23 +++ MAINTAINERS | 6 drivers/Kconfig | 2 drivers/Makefile | 1 drivers/als/Kconfig | 10 + drivers/als/Makefile | 5 drivers/als/als_sys.c | 200 ++++++++++++++++++++++++++++++ include/linux/als_sys.h | 51 +++++++ 8 files changed, 298 insertions(+) Index: linux-2.6/drivers/Kconfig =================================================================== --- linux-2.6.orig/drivers/Kconfig +++ linux-2.6/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" Index: linux-2.6/drivers/Makefile =================================================================== --- linux-2.6.orig/drivers/Makefile +++ linux-2.6/drivers/Makefile @@ -76,6 +76,7 @@ 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/ Index: linux-2.6/drivers/als/Kconfig =================================================================== --- /dev/null +++ linux-2.6/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 interface for + Ambient Light Sensor devices. + If you want this support, you should say Y or M here. Index: linux-2.6/drivers/als/Makefile =================================================================== --- /dev/null +++ linux-2.6/drivers/als/Makefile @@ -0,0 +1,5 @@ +# +# Makefile for Ambient Light Sensor device drivers. +# + +obj-$(CONFIG_ALS) += als_sys.o Index: linux-2.6/drivers/als/als_sys.c =================================================================== --- /dev/null +++ linux-2.6/drivers/als/als_sys.c @@ -0,0 +1,200 @@ +/* + * als_sys.c - Ambient Light Sensor Sysfs support. + * + * Copyright (C) 2009 Intel Corp + * Copyright (C) 2009 Zhang Rui + * + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + * + * 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 +#include +#include +#include + +MODULE_AUTHOR("Zhang Rui"); +MODULE_DESCRIPTION("Ambient Light Sensor sysfs support"); +MODULE_LICENSE("GPL"); + +static int als_get_adjustment(struct als_device *, int, int *); + +/* sys I/F for Ambient Light Sensor */ + +#define to_als_device(dev) container_of(dev, struct als_device, device) + +static ssize_t +illuminance_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct als_device *als = to_als_device(dev); + int illuminance; + int result; + + result = als->ops->get_illuminance(als, &illuminance); + if (result) + return result; + + if (!illuminance) + return sprintf(buf, "Illuminance below the supported range\n"); + else if (illuminance == -1) + return sprintf(buf, "Illuminance above the supported range\n"); + else if (illuminance < -1) + return -ERANGE; + else + return sprintf(buf, "%d\n", illuminance); +} + +static ssize_t +adjustment_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct als_device *als = to_als_device(dev); + int illuminance, adjustment; + int result; + + result = als->ops->get_illuminance(als, &illuminance); + if (result) + return result; + + if (illuminance < 0 && illuminance != -1) + return sprintf(buf, "Current illuminance invalid\n"); + + result = als_get_adjustment(als, illuminance, &adjustment); + if (result) + return result; + + return sprintf(buf, "%d%%\n", adjustment); +} + +static struct device_attribute als_attrs[] = { + __ATTR(illuminance, 0444, illuminance_show, NULL), + __ATTR(display_adjustment, 0444, adjustment_show, NULL), + __ATTR_NULL, +}; + +static void als_release(struct device *dev) +{ + struct als_device *als = to_als_device(dev); + + kfree(als); +} + +static struct class als_class = { + .name = "als", + .dev_release = als_release, + .dev_attrs = als_attrs, +}; + +static int als_get_adjustment(struct als_device *als, int illuminance, + int *adjustment) +{ + int lux_high, lux_low, adj_high, adj_low; + int i; + + if (!als->mappings) + return -EINVAL; + + if (illuminance == -1 + || illuminance > als->mappings[als->count - 1].illuminance) + illuminance = als->mappings[als->count - 1].illuminance; + else if (illuminance < als->mappings[0].illuminance) + illuminance = als->mappings[0].illuminance; + + for (i = 0; i < als->count; i++) { + if (illuminance == als->mappings[i].illuminance) { + *adjustment = als->mappings[i].adjustment; + return 0; + } + + if (illuminance > als->mappings[i].illuminance) + continue; + + lux_high = als->mappings[i].illuminance; + lux_low = als->mappings[i - 1].illuminance; + adj_high = als->mappings[i].adjustment; + adj_low = als->mappings[i - 1].adjustment; + + *adjustment = + ((adj_high - adj_low) * (illuminance - lux_low)) / + (lux_high - lux_low) + adj_low; + return 0; + } + return -EINVAL; +} + +/** + * als_device_register - register a new Ambient Light Sensor class device + * @ops: standard ALS devices callbacks. + * @devdata: device private data. + */ +struct als_device *als_device_register(struct als_device_ops *ops, + char *name, void *devdata) +{ + struct als_device *als; + int result = -ENOMEM; + + if (!ops || !ops->get_illuminance || !name) + return ERR_PTR(-EINVAL); + + als = kzalloc(sizeof(struct als_device), GFP_KERNEL); + if (!als) + return ERR_PTR(-ENOMEM); + + als->ops = ops; + als->device.class = &als_class; + dev_set_name(&als->device, name); + dev_set_drvdata(&als->device, devdata); + result = device_register(&als->device); + if (result) + goto err; + + if (ops->update_mappings) { + result = ops->update_mappings(als); + if (result) { + device_unregister(&als->device); + goto err; + } + } + return als; + +err: + kfree(als); + return ERR_PTR(result); +} +EXPORT_SYMBOL(als_device_register); + +/** + * als_device_unregister - removes the registered ALS device + * @als: the ALS device to remove. + */ +void als_device_unregister(struct als_device *als) +{ + device_unregister(&als->device); +} +EXPORT_SYMBOL(als_device_unregister); + +static int __init als_init(void) +{ + return class_register(&als_class); +} + +static void __exit als_exit(void) +{ + class_unregister(&als_class); +} + +subsys_initcall(als_init); +module_exit(als_exit); Index: linux-2.6/include/linux/als_sys.h =================================================================== --- /dev/null +++ linux-2.6/include/linux/als_sys.h @@ -0,0 +1,51 @@ +/* + * als.h + * + * Copyright (C) 2009 Intel Corp + * Copyright (C) 2009 Zhang Rui + * + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + * 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 + +struct als_device; + +struct als_device_ops { + int (*get_illuminance) (struct als_device *, int *); + int (*update_mappings) (struct als_device *); +}; + +struct als_mapping { + int illuminance; + int adjustment; +}; + +struct als_device { + struct device device; + struct als_device_ops *ops; + int count; + struct als_mapping *mappings; +}; + +struct als_device *als_device_register(struct als_device_ops *, char *, void *); +void als_device_unregister(struct als_device *); + +#endif /* __ALS_SYS_H__ */ Index: linux-2.6/Documentation/ABI/testing/sysfs-class-als =================================================================== --- /dev/null +++ linux-2.6/Documentation/ABI/testing/sysfs-class-als @@ -0,0 +1,23 @@ +What: /sys/class/als/.../illuminance +Date: Aug. 2009 +KernelVersion: 2.6.32 +Contact: Zhang Rui +Description: Current Ambient Light Illuminance reported by + native ALS driver + Unit: lux (lumens per square meter) + RO + +What: /sys/class/als/.../display_adjustment +Date: Aug. 2009 +KernelVersion: 2.6.32 +Contact: Zhang Rui +Description: a relative percentages in order to simplify the means + by which these adjustments are applied in lieu of + changes to the user’s display brightness preference. + A value of 100% is used to indicate no display + brightness adjustment. + Values less than 100% indicate a negative adjustment + (dimming); values greater than 100% indicate a positive + adjustment (brightening). + RO + Index: linux-2.6/MAINTAINERS =================================================================== --- linux-2.6.orig/MAINTAINERS +++ linux-2.6/MAINTAINERS @@ -399,6 +399,12 @@ S: Maintained for 2.4; PCI support for 2 L: linux-alpha@vger.kernel.org F: arch/alpha/ +AMBIENT LIGHT SENSOR +M: Zhang Rui +S: Supported +F: include/linux/als_sys.h +F: drivers/als/ + AMD GEODE CS5536 USB DEVICE CONTROLLER DRIVER M: Thomas Dahlmann L: linux-geode@lists.infradead.org (moderated for non-subscribers) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/