Max Wash
c5edce612d
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.
79 lines
2.0 KiB
C
79 lines
2.0 KiB
C
#include <socks/device.h>
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#include <socks/bitmap.h>
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#include <socks/libc/stdio.h>
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static DECLARE_BITMAP(fb_device_ids, FRAMEBUFFER_DEVICE_MAX);
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static spin_lock_t fb_device_ids_lock = SPIN_LOCK_INIT;
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struct framebuffer_device *framebuffer_device_create(void)
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{
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struct device *dev = device_alloc();
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if (!dev) {
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return NULL;
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}
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dev->dev_type = DEV_TYPE_FRAMEBUFFER;
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return FRAMEBUFFER_DEVICE(dev);
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}
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struct framebuffer_device *framebuffer_device_from_generic(struct device *dev)
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{
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dev->dev_type = DEV_TYPE_FRAMEBUFFER;
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return FRAMEBUFFER_DEVICE(dev);
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}
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static kern_status_t generate_name(struct framebuffer_device *dev, char out[DEV_NAME_MAX])
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{
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snprintf(out, DEV_NAME_MAX, "fb%u", dev->fb_id);
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return KERN_OK;
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}
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kern_status_t framebuffer_device_register(struct device *dev)
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{
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unsigned long flags;
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spin_lock_irqsave(&fb_device_ids_lock, &flags);
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unsigned int id = bitmap_lowest_clear(fb_device_ids, INPUT_DEVICE_MAX);
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bitmap_set(fb_device_ids, id);
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spin_unlock_irqrestore(&fb_device_ids_lock, flags);
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struct framebuffer_device *fbdev = &dev->fb;
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fbdev->fb_id = id;
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char name[DEV_NAME_MAX];
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generate_name(fbdev, name);
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char path[OBJECT_PATH_MAX];
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snprintf(path, sizeof path, "/dev/video/%s", name);
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return object_namespace_create_link(global_namespace(), path, &dev->dev_base);
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}
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kern_status_t framebuffer_get_varinfo(struct device *dev, struct framebuffer_varinfo *varinfo)
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{
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struct framebuffer_device *fbdev = FRAMEBUFFER_DEVICE(dev);
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if (!fbdev) {
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return KERN_INVALID_ARGUMENT;
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}
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memcpy(varinfo, &fbdev->fb_varinfo, sizeof *varinfo);
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return KERN_OK;
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}
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kern_status_t framebuffer_set_varinfo(struct device *dev, const struct framebuffer_varinfo *varinfo)
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{
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struct framebuffer_device *fbdev = FRAMEBUFFER_DEVICE(dev);
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if (!fbdev) {
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return KERN_INVALID_ARGUMENT;
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}
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if (!fbdev->fb_ops || !fbdev->fb_ops->set_varinfo) {
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return KERN_UNSUPPORTED;
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}
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return fbdev->fb_ops->set_varinfo(dev, varinfo);
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}
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struct device_type_ops framebuffer_type_ops = {
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.register_device = framebuffer_device_register,
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};
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