drivers/leds/leds-ip30.c
Source file repositories/reference/linux-study-clean/drivers/leds/leds-ip30.c
File Facts
- System
- Linux kernel
- Corpus path
drivers/leds/leds-ip30.c- Extension
.c- Size
- 1697 bytes
- Lines
- 82
- Domain
- Driver Families
- Bucket
- drivers/leds
- Inferred role
- Driver Families: implementation source
- Status
- source implementation candidate
Why This File Exists
Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.
- Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.
- Allocates kernel memory; connect allocation flags and lifetime to context constraints.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
asm/io.hlinux/module.hlinux/kernel.hlinux/platform_device.hlinux/leds.h
Detected Declarations
struct ip30_ledfunction ip30led_setfunction ip30led_createfunction ip30led_probe
Annotated Snippet
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 ip30_led *data;
data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->reg = devm_platform_ioremap_resource(pdev, num);
if (IS_ERR(data->reg))
return PTR_ERR(data->reg);
switch (num) {
case IP30_LED_SYSTEM:
data->cdev.name = "white:power";
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");
Annotation
- Immediate include surface: `asm/io.h`, `linux/module.h`, `linux/kernel.h`, `linux/platform_device.h`, `linux/leds.h`.
- Detected declarations: `struct ip30_led`, `function ip30led_set`, `function ip30led_create`, `function ip30led_probe`.
- Atlas domain: Driver Families / drivers/leds.
- Implementation status: source implementation candidate.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.