Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751874Ab0BHUtn (ORCPT ); Mon, 8 Feb 2010 15:49:43 -0500 Received: from ausxippc101.us.dell.com ([143.166.85.207]:20733 "EHLO ausxippc101.us.dell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751414Ab0BHUtl (ORCPT ); Mon, 8 Feb 2010 15:49:41 -0500 X-Loopcount0: from 10.208.86.12 Message-ID: <4B7078E2.50407@dell.com> Date: Mon, 08 Feb 2010 14:49:38 -0600 From: Bob Rodgers User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.7) Gecko/20100111 Thunderbird/3.0.1 MIME-Version: 1.0 To: Matthew Garrett , "lenb@kernel.org" , "rpurdie@rpsys.net" , Linux-kernel CC: Louis Davis , Jim Dailey , Michael Brown , Mario Limonciello , Matt Domsch , Robert_Rodgers@dell.com, Dan Carpenter , Dmitry Torokhov Subject: [PATCH] Add Dell Business Class Netbook LED driver Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 7610 Lines: 298 This patch adds an LED driver to support the Dell Activity LED on the Dell Latitude 2100 netbook and future products to come. The Activity LED is visible externally in the lid so classroom instructors can observe it from a distance. The driver uses the sysfs led_class and provides a standard LED interface. This driver is ready for submission upstream. Signed-off by: Bob Rodgers Signed-off-by: Louis Davis Signed-off-by: Jim Dailey , Developers Acked-by: Matthew Garrett --- drivers/leds/Kconfig | 7 ++ drivers/leds/Makefile | 1 + drivers/leds/dell-led.c | 233 +++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 241 insertions(+), 0 deletions(-) create mode 100644 drivers/leds/dell-led.c diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index 8a0e1ec..40dd693 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -269,6 +269,13 @@ config LEDS_ADP5520 To compile this driver as a module, choose M here: the module will be called leds-adp5520. +config LEDS_DELL_NETBOOKS + tristate "External LED on Dell Business Netbooks" + depends on LEDS_CLASS + help + This adds support for the Latitude 2100 and similar + notebooks that have an external LED. + comment "LED Triggers" config LEDS_TRIGGERS diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index 9e63869..327bfa0 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -33,6 +33,7 @@ obj-$(CONFIG_LEDS_REGULATOR) += leds-regulator.o obj-$(CONFIG_LEDS_INTEL_SS4200) += leds-ss4200.o obj-$(CONFIG_LEDS_LT3593) += leds-lt3593.o obj-$(CONFIG_LEDS_ADP5520) += leds-adp5520.o +obj-$(CONFIG_LEDS_DELL_NETBOOKS) += dell-led.o # LED SPI Drivers obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o diff --git a/drivers/leds/dell-led.c b/drivers/leds/dell-led.c new file mode 100644 index 0000000..44a7a06 --- /dev/null +++ b/drivers/leds/dell-led.c @@ -0,0 +1,233 @@ +/* + * dell_led.c - Dell LED Driver + * + * Copyright (C) 2010 Dell Inc. + * Louis Davis + * Jim Dailey + * + * 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. + * + */ + +#include +#include +#include + +MODULE_AUTHOR("Louis Davis/Jim Dailey"); +MODULE_DESCRIPTION("Dell LED Control Driver"); +MODULE_LICENSE("GPL"); + +#define DELL_LED_BIOS_GUID "F6E4FE6E-909D-47cb-8BAB-C9F6F2F8D396" +MODULE_ALIAS("wmi:" DELL_LED_BIOS_GUID); + +/* Error Result Codes: */ +#define INVALID_DEVICE_ID 250 +#define INVALID_PARAMETER 251 +#define INVALID_BUFFER 252 +#define INTERFACE_ERROR 253 +#define UNSUPPORTED_COMMAND 254 +#define UNSPECIFIED_ERROR 255 + +/* Device ID */ +#define DEVICE_ID_PANEL_BACK 1 + +/* LED Commands */ +#define CMD_LED_ON 16 +#define CMD_LED_OFF 17 +#define CMD_LED_BLINK 18 + +struct bios_args { + unsigned char length; + unsigned char result_code; + unsigned char device_id; + unsigned char command; + unsigned char on_time; + unsigned char off_time; +}; + +static u8 dell_led_perform_fn(u8 length, + u8 result_code, + u8 device_id, + u8 command, + u8 on_time, + u8 off_time) +{ + struct bios_args *bios_return; + u8 return_code; + union acpi_object *obj; + struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL }; + struct acpi_buffer input; + + struct bios_args args; + args.length = length; + args.result_code = result_code; + args.device_id = device_id; + args.command = command; + args.on_time = on_time; + args.off_time = off_time; + + input.length = sizeof(struct bios_args); + input.pointer = &args; + + wmi_evaluate_method(DELL_LED_BIOS_GUID, + 1, + 1, + &input, + &output); + + obj = output.pointer; + + if (!obj || obj->type != ACPI_TYPE_BUFFER) + return -EINVAL; + + bios_return = ((struct bios_args *)obj->buffer.pointer); + return_code = bios_return->result_code; + + kfree(obj); + + return return_code; +} + +static u8 led_on(void) +{ + return dell_led_perform_fn(3, /* Length of command */ + INTERFACE_ERROR, /* Init to INTERFACE_ERROR */ + DEVICE_ID_PANEL_BACK, /* Device ID */ + CMD_LED_ON, /* Command */ + 0, /* not used */ + 0); /* not used */ +} + +static u8 led_off(void) +{ + return dell_led_perform_fn(3, /* Length of command */ + INTERFACE_ERROR, /* Init to INTERFACE_ERROR */ + DEVICE_ID_PANEL_BACK, /* Device ID */ + CMD_LED_OFF, /* Command */ + 0, /* not used */ + 0); /* not used */ +} + +static u8 led_blink(unsigned char on_eighths, + unsigned char off_eighths) +{ + return dell_led_perform_fn(5, /* Length of command */ + INTERFACE_ERROR, /* Init to INTERFACE_ERROR */ + DEVICE_ID_PANEL_BACK, /* Device ID */ + CMD_LED_BLINK, /* Command */ + on_eighths, /* blink on in eigths of a second */ + off_eighths); /* blink off in eights of a second */ +} + +static void dell_led_set(struct led_classdev *led_cdev, + enum led_brightness value) +{ + if (value == LED_OFF) + led_off(); + else + led_on(); +} + +static int dell_led_blink(struct led_classdev *led_cdev, + unsigned long *delay_on, + unsigned long *delay_off) +{ + unsigned long on_eighths; + unsigned long off_eighths; + + /* The Dell LED delay is based on 125ms intervals. + Need to round up to next interval. */ + + on_eighths = (*delay_on + 124) / 125; + if (0 == on_eighths) + on_eighths = 1; + if (on_eighths > 255) + on_eighths = 255; + *delay_on = on_eighths * 125; + + off_eighths = (*delay_off + 124) / 125; + if (0 == off_eighths) + off_eighths = 1; + if (off_eighths > 255) + off_eighths = 255; + *delay_off = off_eighths * 125; + + led_blink(on_eighths, off_eighths); + + return 0; +} + +static struct led_classdev dell_led = { + .name = "dell::lid", + .brightness = LED_OFF, + .max_brightness = 1, + .brightness_set = dell_led_set, + .blink_set = dell_led_blink, + .flags = LED_CORE_SUSPENDRESUME, +}; + +static int __devinit dell_led_probe(struct platform_device *pdev) +{ + return led_classdev_register(&pdev->dev, &dell_led); +} + +static int dell_led_remove(struct platform_device *pdev) +{ + led_classdev_unregister(&dell_led); + return 0; +} + +static struct platform_driver dell_led_driver = { + .probe = dell_led_probe, + .remove = dell_led_remove, + .driver = { + .name = KBUILD_MODNAME, + .owner = THIS_MODULE, + }, +}; + +static struct platform_device *pdev; + +static int __init dell_led_init(void) +{ + int error = 0; + + if (!wmi_has_guid(DELL_LED_BIOS_GUID)) { + printk(KERN_DEBUG KBUILD_MODNAME + ": could not find: DELL_LED_BIOS_GUID\n"); + return -ENODEV; + } + + error = led_off(); + if (error != 0) { + printk(KERN_DEBUG KBUILD_MODNAME + ": could not communicate with LED" + ": error %d\n", error); + return -ENODEV; + } + + error = platform_driver_register(&dell_led_driver); + if (error < 0) + return error; + + pdev = platform_device_register_simple(KBUILD_MODNAME, -1, NULL, 0); + if (IS_ERR(pdev)) { + error = PTR_ERR(pdev); + platform_driver_unregister(&dell_led_driver); + } + + return error; +} + +static void __exit dell_led_exit(void) +{ + platform_driver_unregister(&dell_led_driver); + platform_device_unregister(pdev); + + led_off(); +} + +module_init(dell_led_init); +module_exit(dell_led_exit); -- 1.6.5 -- 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/