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Date: Thu, 31 May 2012 19:39:52 +0800
From: Bryan Wu <bryan.wu@...onical.com>
To: "Steven J. Hill" <sjhill@...s.com>
Cc: Linux LED Subsystem <linux-leds@...r.kernel.org>,
Richard Purdie <rpurdie@...ys.net>,
Chris Dearman <chris@...s.com>,
lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] leds: Support for MIPS SEAD-3 controlled LEDs
On Wed, May 30, 2012 at 11:55 PM, Steven J. Hill <sjhill@...s.com> wrote:
> From: "Steven J. Hill" <sjhill@...s.com>
>
> Add driver for the two LED banks on the MIPS SEAD-3 platform.
>
Overall this LED driver looks very specific to MIPS board SEAD-3 and
the code is not going to share with other platform. How about just
adding this driver in your MIPS machine code, like I did in ARM LED
consolidation work here:
http://git.kernel.org/?p=linux/kernel/git/cooloney/linux-leds.git;a=commitdiff;h=a1bebaca84560c691b7ca6c86df541f36ff87432
> Signed-off-by: Chris Dearman <chris@...s.com>
> Signed-off-by: Steven J. Hill <sjhill@...s.com>
> ---
> drivers/leds/Kconfig | 13 +++++
> drivers/leds/Makefile | 1 +
> drivers/leds/leds-sead3.c | 125 +++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 139 insertions(+)
> create mode 100644 drivers/leds/leds-sead3.c
>
> diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
> index ff4b8cf..3407020 100644
> --- a/drivers/leds/Kconfig
> +++ b/drivers/leds/Kconfig
> @@ -401,6 +401,19 @@ config LEDS_OT200
> This option enables support for the LEDs on the Bachmann OT200.
> Say Y to enable LEDs on the Bachmann OT200.
>
> +config LEDS_SEAD3
> + tristate "LED support for MIPS SEAD-3"
> + depends on LEDS_CLASS && MIPS_SEAD3
> + help
> + This option enables support for the two LED banks on the MIPS
> + SEAD-3 platform. They are accessible via the sysfs interface:
> +
> + /sys/class/leds/sead3::pled/brightness
> + /sys/class/leds/sead3::fled/brightness
> +
> + To compile this driver as a module, choose M here: the
> + module will be called leds-sead3.
> +
> config LEDS_TRIGGERS
> bool "LED Trigger support"
> depends on LEDS_CLASS
> diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
> index 890481c..2003fee 100644
> --- a/drivers/leds/Makefile
> +++ b/drivers/leds/Makefile
> @@ -45,6 +45,7 @@ obj-$(CONFIG_LEDS_NETXBIG) += leds-netxbig.o
> obj-$(CONFIG_LEDS_ASIC3) += leds-asic3.o
> obj-$(CONFIG_LEDS_RENESAS_TPU) += leds-renesas-tpu.o
> obj-$(CONFIG_LEDS_MAX8997) += leds-max8997.o
> +obj-$(CONFIG_LEDS_SEAD3) += leds-sead3.o
>
> # LED SPI Drivers
> obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o
> diff --git a/drivers/leds/leds-sead3.c b/drivers/leds/leds-sead3.c
> new file mode 100644
> index 0000000..9d3d437
> --- /dev/null
> +++ b/drivers/leds/leds-sead3.c
> @@ -0,0 +1,125 @@
> +/*
> + * This file is subject to the terms and conditions of the GNU General Public
> + * License. See the file "COPYING" in the main directory of this archive
> + * for more details.
> + *
> + * Copyright (C) 2010-2012 MIPS Technologies, Inc.
> + *
> + * Based on leds-wrap.c
> + * Copyright (C) 2006 Kristian Kielhofner <kris@...sk.org>
> + */
> +#include <linux/module.h>
> +#include <linux/err.h>
> +#include <linux/io.h>
> +#include <linux/leds.h>
> +#include <linux/platform_device.h>
> +
> +#define DRVNAME "sead3-led"
> +
> +static struct platform_device *pdev;
> +
> +static void sead3_pled_set(struct led_classdev *led_cdev,
> + enum led_brightness value)
> +{
> + writel(value, (void __iomem *)0xbf000210);
No idea for this address, is that a register for brightness? It's
better to give a meaningful name.
> +}
> +
> +static void sead3_fled_set(struct led_classdev *led_cdev,
> + enum led_brightness value)
> +{
> + writel(value, (void __iomem *)0xbf000218);
> +}
> +
> +static struct led_classdev sead3_pled = {
> + .name = "sead3::pled",
> + .brightness_set = sead3_pled_set,
If you need to support suspend/resume, just add this
.flags = LED_CORE_SUSPENDRESUME
And don't need following PM functions.
> +};
> +
> +static struct led_classdev sead3_fled = {
> + .name = "sead3::fled",
> + .brightness_set = sead3_fled_set,
> +};
> +
> +#ifdef CONFIG_PM
> +static int sead3_led_suspend(struct platform_device *dev, pm_message_t state)
> +{
> + led_classdev_suspend(&sead3_pled);
> + led_classdev_suspend(&sead3_fled);
> + return 0;
> +}
> +
> +static int sead3_led_resume(struct platform_device *dev)
> +{
> + led_classdev_resume(&sead3_pled);
> + led_classdev_resume(&sead3_fled);
> + return 0;
> +}
> +#else
> +#define sead3_led_suspend NULL
> +#define sead3_led_resume NULL
> +#endif
> +
> +static int sead3_led_probe(struct platform_device *pdev)
> +{
> + int ret;
> +
> + ret = led_classdev_register(&pdev->dev, &sead3_pled);
> + if (ret < 0)
> + return ret;
> +
> + ret = led_classdev_register(&pdev->dev, &sead3_fled);
> + if (ret < 0)
> + led_classdev_unregister(&sead3_pled);
> +
> + return ret;
> +}
> +
> +static int sead3_led_remove(struct platform_device *pdev)
> +{
> + led_classdev_unregister(&sead3_pled);
> + led_classdev_unregister(&sead3_fled);
> + return 0;
> +}
> +
> +static struct platform_driver sead3_led_driver = {
> + .driver = {
> + .name = DRVNAME,
> + .owner = THIS_MODULE,
> + },
> + .probe = sead3_led_probe,
> + .remove = sead3_led_remove,
> + .suspend = sead3_led_suspend,
> + .resume = sead3_led_resume,
> +};
> +
> +static int __init sead3_led_init(void)
> +{
> + int ret;
> +
> + ret = platform_driver_register(&sead3_led_driver);
> + if (ret < 0)
> + return ret;
> +
> + pdev = platform_device_register_simple(DRVNAME, -1, NULL, 0);
> + if (IS_ERR(pdev)) {
> + ret = PTR_ERR(pdev);
> + platform_driver_unregister(&sead3_led_driver);
> + }
> +
> + return ret;
> +}
> +module_init(sead3_led_init);
> +
> +static void __exit sead3_led_exit(void)
> +{
> + platform_device_unregister(pdev);
> + platform_driver_unregister(&sead3_led_driver);
> +
> + sead3_pled_set(NULL, 0);
> + sead3_fled_set(NULL, 0);
> +}
> +module_exit(sead3_led_exit);
> +
> +MODULE_AUTHOR("Chris Dearman <chris@...s.com");
> +MODULE_DESCRIPTION("SEAD-3 LED driver");
> +MODULE_LICENSE("GPL");
> --
> 1.7.10
>
--
Bryan Wu <bryan.wu@...onical.com>
Kernel Developer +86.186-168-78255 Mobile
Canonical Ltd. www.canonical.com
Ubuntu - Linux for human beings | www.ubuntu.com
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