From: David Herrmann dh.herrmann@googlemail.com
This adds the VESA BIOS Extension (VBE) device type. Platform code needs to provide the "vbefb" platform-device with a screen_info structure as platform code.
All drivers that depend on VBE can now register as bus drivers and bind to SYSFB_VBE devices. There is no distinction between graphics framebuffers or plain text VGA. Drivers ought to inspect the screen_info and return -ENODEV during probe() is they cannot make use of the device.
Only one framebuffer of type SYSFB_VBE is available on a system at a time.
Signed-off-by: David Herrmann dh.herrmann@googlemail.com --- drivers/video/sysfb.c | 77 +++++++++++++++++++++++++++++++++++++++++++++++++++ include/linux/sysfb.h | 5 +++- 2 files changed, 81 insertions(+), 1 deletion(-)
diff --git a/drivers/video/sysfb.c b/drivers/video/sysfb.c index 8249006..5b47a9a 100644 --- a/drivers/video/sysfb.c +++ b/drivers/video/sysfb.c @@ -205,6 +205,72 @@ void sysfb_taint(struct sysfb_device *sdev, bool set) } EXPORT_SYMBOL(sysfb_taint);
+static void sysfb_dev_release(struct device *dev) +{ + struct sysfb_device *sdev = to_sysfb_device(dev); + + kfree(sdev); +} + +static struct sysfb_device *sysfb_dev_new(struct device *parent) +{ + struct sysfb_device *sdev; + + sdev = kzalloc(sizeof(*sdev), GFP_KERNEL); + if (!sdev) + return NULL; + + device_initialize(&sdev->dev); + sdev->dev.release = sysfb_dev_release; + sdev->dev.bus = &sysfb_bus_type; + sdev->dev.parent = parent; + + return sdev; +} + +static int sysfb_vbe_probe(struct platform_device *pdev) +{ + int ret; + struct sysfb_device *sdev; + + sdev = sysfb_dev_new(&pdev->dev); + if (!sdev) + return -ENOMEM; + + dev_set_name(&sdev->dev, "vbefb"); + sdev->type = SYSFB_VBE; + sdev->screen = pdev->dev.platform_data; + + ret = device_add(&sdev->dev); + if (ret) + goto err_free; + + platform_set_drvdata(pdev, sdev); + return 0; + +err_free: + put_device(&sdev->dev); + return ret; +} + +static int sysfb_vbe_remove(struct platform_device *pdev) +{ + struct sysfb_device *sdev = platform_get_drvdata(pdev); + + device_del(&sdev->dev); + put_device(&sdev->dev); + return 0; +} + +static struct platform_driver sysfb_vbe_driver = { + .driver = { + .name = "vbefb", + .owner = THIS_MODULE, + }, + .probe = sysfb_vbe_probe, + .remove = sysfb_vbe_remove, +}; + static int __init sysfb_init(void) { int ret; @@ -215,11 +281,22 @@ static int __init sysfb_init(void) return ret; }
+ ret = platform_driver_register(&sysfb_vbe_driver); + if (ret) { + pr_err("cannot register VBE framebuffer driver\n"); + goto err_bus; + } + return 0; + +err_bus: + bus_unregister(&sysfb_bus_type); + return ret; }
static void __exit sysfb_exit(void) { + platform_driver_unregister(&sysfb_vbe_driver); bus_unregister(&sysfb_bus_type); }
diff --git a/include/linux/sysfb.h b/include/linux/sysfb.h index 6cd3c24..1796c1e 100644 --- a/include/linux/sysfb.h +++ b/include/linux/sysfb.h @@ -20,6 +20,7 @@
/** * sysfb_type + * @SYSFB_VBE: VESA BIOS Extension compatible device (includes VGA devices) * * Different types of available framebuffer devices. Only one device of each * type can be available at a time. In most systems there even is only one @@ -29,7 +30,9 @@ * devices. */ enum sysfb_type { - SYSFB_TYPES = 0, + SYSFB_VBE = 0x01, + + SYSFB_TYPES = SYSFB_VBE, };
/**