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dev: implement generic devices

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generic devices don't have a type (char, block, etc) and are created
by bus drivers to represent the device until a suitable driver is found.

generic devices are registered by the bus driver. once a more suitable
driver is found, that driver will re-register the device under itself.
This commit is contained in:
max 🍓
2023-06-10 13:21:42 +01:00
parent 4a2c5de5b6
commit c5edce612d
8 changed files with 122 additions and 8 deletions
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31
dev/fb.c
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@@ -17,6 +17,12 @@ struct framebuffer_device *framebuffer_device_create(void)
return FRAMEBUFFER_DEVICE(dev);
}
struct framebuffer_device *framebuffer_device_from_generic(struct device *dev)
{
dev->dev_type = DEV_TYPE_FRAMEBUFFER;
return FRAMEBUFFER_DEVICE(dev);
}
static kern_status_t generate_name(struct framebuffer_device *dev, char out[DEV_NAME_MAX])
{
snprintf(out, DEV_NAME_MAX, "fb%u", dev->fb_id);
@@ -42,6 +48,31 @@ kern_status_t framebuffer_device_register(struct device *dev)
return object_namespace_create_link(global_namespace(), path, &dev->dev_base);
}
kern_status_t framebuffer_get_varinfo(struct device *dev, struct framebuffer_varinfo *varinfo)
{
struct framebuffer_device *fbdev = FRAMEBUFFER_DEVICE(dev);
if (!fbdev) {
return KERN_INVALID_ARGUMENT;
}
memcpy(varinfo, &fbdev->fb_varinfo, sizeof *varinfo);
return KERN_OK;
}
kern_status_t framebuffer_set_varinfo(struct device *dev, const struct framebuffer_varinfo *varinfo)
{
struct framebuffer_device *fbdev = FRAMEBUFFER_DEVICE(dev);
if (!fbdev) {
return KERN_INVALID_ARGUMENT;
}
if (!fbdev->fb_ops || !fbdev->fb_ops->set_varinfo) {
return KERN_UNSUPPORTED;
}
return fbdev->fb_ops->set_varinfo(dev, varinfo);
}
struct device_type_ops framebuffer_type_ops = {
.register_device = framebuffer_device_register,
};