redonkable/alistair23-linux
redonkable/alistair23-linux
1
0
Fork 0
Code Releases Activity

leds: add SGI IP30 led support

Browse source 
This patch implemenets a driver to support the front panel LEDs of
SGI Octane (IP30) workstations.

Reviewed-by: Dan Murphy <dmurphy@ti.com>
Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
Acked-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Signed-off-by: Pavel Machek <pavel@ucw.cz>
This commit is contained in:
Thomas Bogendoerfer 2020-02-24 12:17:33 +01:00 committed by Pavel Machek
parent cc9c077f6a
commit 64d7e23115
3 changed files with 98 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

11
drivers/leds/Kconfig
View file

@ -846,6 +846,17 @@ config LEDS_TPS6105X
It is a single boost converter primarily for white LEDs and
audio amplifiers.
config LEDS_IP30
tristate "LED support for SGI Octane machines"
depends on LEDS_CLASS
depends on SGI_MFD_IOC3
help
This option enables support for the Red and White LEDs of
SGI Octane machines.
To compile this driver as a module, choose M here: the module
will be called leds-ip30.
comment "LED Triggers"
source "drivers/leds/trigger/Kconfig"

1
drivers/leds/Makefile
View file

@ -86,6 +86,7 @@ obj-$(CONFIG_LEDS_TI_LMU_COMMON) += leds-ti-lmu-common.o
obj-$(CONFIG_LEDS_LM3697) += leds-lm3697.o
obj-$(CONFIG_LEDS_LM36274) += leds-lm36274.o
obj-$(CONFIG_LEDS_TPS6105X) += leds-tps6105x.o
obj-$(CONFIG_LEDS_IP30) += leds-ip30.o
# LED SPI Drivers
obj-$(CONFIG_LEDS_CR0014114) += leds-cr0014114.o

86
drivers/leds/leds-ip30.c Normal file
View file

@ -0,0 +1,86 @@
// SPDX-License-Identifier: GPL-2.0
/*
* LED Driver for SGI Octane machines
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/leds.h>
#define IP30_LED_SYSTEM 0
#define IP30_LED_FAULT 1
struct ip30_led {
struct led_classdev cdev;
u32 __iomem *reg;
};
static void ip30led_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
struct ip30_led *led = container_of(led_cdev, struct ip30_led, cdev);
writel(value, led->reg);
}
static int ip30led_create(struct platform_device *pdev, int num)
{
struct resource *res;
struct ip30_led *data;
res = platform_get_resource(pdev, IORESOURCE_MEM, num);
if (!res)
return -EBUSY;
data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->reg = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(data->reg))
return PTR_ERR(data->reg);
switch (num) {
case IP30_LED_SYSTEM:
data->cdev.name = "white:system";
break;
case IP30_LED_FAULT:
data->cdev.name = "red:fault";
break;
default:
return -EINVAL;
}
data->cdev.brightness = readl(data->reg);
data->cdev.max_brightness = 1;
data->cdev.brightness_set = ip30led_set;
return devm_led_classdev_register(&pdev->dev, &data->cdev);
}
static int ip30led_probe(struct platform_device *pdev)
{
int ret;
ret = ip30led_create(pdev, IP30_LED_SYSTEM);
if (ret < 0)
return ret;
return ip30led_create(pdev, IP30_LED_FAULT);
}
static struct platform_driver ip30led_driver = {
.probe = ip30led_probe,
.driver = {
.name = "ip30-leds",
},
};
module_platform_driver(ip30led_driver);
MODULE_AUTHOR("Thomas Bogendoerfer <tbogendoerfer@suse.de>");
MODULE_DESCRIPTION("SGI Octane LED driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:ip30-leds");