[deliverable/linux.git] / drivers / video / fbdev / efifb.c

/*
 * Framebuffer driver for EFI/UEFI based system
 *
 * (c) 2006 Edgar Hucek <gimli@dark-green.com>
 * Original efi driver written by Gerd Knorr <kraxel@goldbach.in-berlin.de>
 *
 */

#include <linux/kernel.h>
#include <linux/efi.h>
#include <linux/errno.h>
#include <linux/fb.h>
#include <linux/platform_device.h>
#include <linux/screen_info.h>
#include <video/vga.h>
#include <asm/efi.h>

static bool request_mem_succeeded = false;

static struct fb_var_screeninfo efifb_defined = {
	.activate		= FB_ACTIVATE_NOW,
	.height			= -1,
	.width			= -1,
	.right_margin		= 32,
	.upper_margin		= 16,
	.lower_margin		= 4,
	.vsync_len		= 4,
	.vmode			= FB_VMODE_NONINTERLACED,
};

static struct fb_fix_screeninfo efifb_fix = {
	.id			= "EFI VGA",
	.type			= FB_TYPE_PACKED_PIXELS,
	.accel			= FB_ACCEL_NONE,
	.visual			= FB_VISUAL_TRUECOLOR,
};

static int efifb_setcolreg(unsigned regno, unsigned red, unsigned green,
			   unsigned blue, unsigned transp,
			   struct fb_info *info)
{
	/*
	 *  Set a single color register. The values supplied are
	 *  already rounded down to the hardware's capabilities
	 *  (according to the entries in the `var' structure). Return
	 *  != 0 for invalid regno.
	 */

	if (regno >= info->cmap.len)
		return 1;

	if (regno < 16) {
		red   >>= 16 - info->var.red.length;
		green >>= 16 - info->var.green.length;
		blue  >>= 16 - info->var.blue.length;
		((u32 *)(info->pseudo_palette))[regno] =
			(red   << info->var.red.offset)   |
			(green << info->var.green.offset) |
			(blue  << info->var.blue.offset);
	}
	return 0;
}

static void efifb_destroy(struct fb_info *info)
{
	if (info->screen_base)
		iounmap(info->screen_base);
	if (request_mem_succeeded)
		release_mem_region(info->apertures->ranges[0].base,
				   info->apertures->ranges[0].size);
	fb_dealloc_cmap(&info->cmap);
}

static struct fb_ops efifb_ops = {
	.owner		= THIS_MODULE,
	.fb_destroy	= efifb_destroy,
	.fb_setcolreg	= efifb_setcolreg,
	.fb_fillrect	= cfb_fillrect,
	.fb_copyarea	= cfb_copyarea,
	.fb_imageblit	= cfb_imageblit,
};

static int efifb_setup(char *options)
{
	char *this_opt;

	if (options && *options) {
		while ((this_opt = strsep(&options, ",")) != NULL) {
			if (!*this_opt) continue;

			efifb_setup_from_dmi(&screen_info, this_opt);

			if (!strncmp(this_opt, "base:", 5))
				screen_info.lfb_base = simple_strtoul(this_opt+5, NULL, 0);
			else if (!strncmp(this_opt, "stride:", 7))
				screen_info.lfb_linelength = simple_strtoul(this_opt+7, NULL, 0) * 4;
			else if (!strncmp(this_opt, "height:", 7))
				screen_info.lfb_height = simple_strtoul(this_opt+7, NULL, 0);
			else if (!strncmp(this_opt, "width:", 6))
				screen_info.lfb_width = simple_strtoul(this_opt+6, NULL, 0);
		}
	}

	return 0;
}

static inline bool fb_base_is_valid(void)
{
	if (screen_info.lfb_base)
		return true;

	if (!(screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE))
		return false;

	if (screen_info.ext_lfb_base)
		return true;

	return false;
}

static int efifb_probe(struct platform_device *dev)
{
	struct fb_info *info;
	int err;
	unsigned int size_vmode;
	unsigned int size_remap;
	unsigned int size_total;
	char *option = NULL;

	if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
		return -ENODEV;

	if (fb_get_options("efifb", &option))
		return -ENODEV;
	efifb_setup(option);

	/* We don't get linelength from UGA Draw Protocol, only from
	 * EFI Graphics Protocol.  So if it's not in DMI, and it's not
	 * passed in from the user, we really can't use the framebuffer.
	 */
	if (!screen_info.lfb_linelength)
		return -ENODEV;

	if (!screen_info.lfb_depth)
		screen_info.lfb_depth = 32;
	if (!screen_info.pages)
		screen_info.pages = 1;
	if (!fb_base_is_valid()) {
		printk(KERN_DEBUG "efifb: invalid framebuffer address\n");
		return -ENODEV;
	}
	printk(KERN_INFO "efifb: probing for efifb\n");

	/* just assume they're all unset if any are */
	if (!screen_info.blue_size) {
		screen_info.blue_size = 8;
		screen_info.blue_pos = 0;
		screen_info.green_size = 8;
		screen_info.green_pos = 8;
		screen_info.red_size = 8;
		screen_info.red_pos = 16;
		screen_info.rsvd_size = 8;
		screen_info.rsvd_pos = 24;
	}

	efifb_fix.smem_start = screen_info.lfb_base;

	if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE) {
		u64 ext_lfb_base;

		ext_lfb_base = (u64)(unsigned long)screen_info.ext_lfb_base << 32;
		efifb_fix.smem_start |= ext_lfb_base;
	}

	efifb_defined.bits_per_pixel = screen_info.lfb_depth;
	efifb_defined.xres = screen_info.lfb_width;
	efifb_defined.yres = screen_info.lfb_height;
	efifb_fix.line_length = screen_info.lfb_linelength;

	/*   size_vmode -- that is the amount of memory needed for the
	 *                 used video mode, i.e. the minimum amount of
	 *                 memory we need. */
	size_vmode = efifb_defined.yres * efifb_fix.line_length;

	/*   size_total -- all video memory we have. Used for
	 *                 entries, ressource allocation and bounds
	 *                 checking. */
	size_total = screen_info.lfb_size;
	if (size_total < size_vmode)
		size_total = size_vmode;

	/*   size_remap -- the amount of video memory we are going to
	 *                 use for efifb.  With modern cards it is no
	 *                 option to simply use size_total as that
	 *                 wastes plenty of kernel address space. */
	size_remap  = size_vmode * 2;
	if (size_remap > size_total)
		size_remap = size_total;
	if (size_remap % PAGE_SIZE)
		size_remap += PAGE_SIZE - (size_remap % PAGE_SIZE);
	efifb_fix.smem_len = size_remap;

	if (request_mem_region(efifb_fix.smem_start, size_remap, "efifb")) {
		request_mem_succeeded = true;
	} else {
		/* We cannot make this fatal. Sometimes this comes from magic
		   spaces our resource handlers simply don't know about */
		printk(KERN_WARNING
		       "efifb: cannot reserve video memory at 0x%lx\n",
			efifb_fix.smem_start);
	}

	info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
	if (!info) {
		printk(KERN_ERR "efifb: cannot allocate framebuffer\n");
		err = -ENOMEM;
		goto err_release_mem;
	}
	platform_set_drvdata(dev, info);
	info->pseudo_palette = info->par;
	info->par = NULL;

	info->apertures = alloc_apertures(1);
	if (!info->apertures) {
		err = -ENOMEM;
		goto err_release_fb;
	}
	info->apertures->ranges[0].base = efifb_fix.smem_start;
	info->apertures->ranges[0].size = size_remap;

	info->screen_base = ioremap_wc(efifb_fix.smem_start, efifb_fix.smem_len);
	if (!info->screen_base) {
		printk(KERN_ERR "efifb: abort, cannot ioremap video memory "
				"0x%x @ 0x%lx\n",
			efifb_fix.smem_len, efifb_fix.smem_start);
		err = -EIO;
		goto err_release_fb;
	}

	printk(KERN_INFO "efifb: framebuffer at 0x%lx, using %dk, total %dk\n",
	       efifb_fix.smem_start, size_remap/1024, size_total/1024);
	printk(KERN_INFO "efifb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
	       efifb_defined.xres, efifb_defined.yres,
	       efifb_defined.bits_per_pixel, efifb_fix.line_length,
	       screen_info.pages);

	efifb_defined.xres_virtual = efifb_defined.xres;
	efifb_defined.yres_virtual = efifb_fix.smem_len /
					efifb_fix.line_length;
	printk(KERN_INFO "efifb: scrolling: redraw\n");
	efifb_defined.yres_virtual = efifb_defined.yres;

	/* some dummy values for timing to make fbset happy */
	efifb_defined.pixclock     = 10000000 / efifb_defined.xres *
					1000 / efifb_defined.yres;
	efifb_defined.left_margin  = (efifb_defined.xres / 8) & 0xf8;
	efifb_defined.hsync_len    = (efifb_defined.xres / 8) & 0xf8;

	efifb_defined.red.offset    = screen_info.red_pos;
	efifb_defined.red.length    = screen_info.red_size;
	efifb_defined.green.offset  = screen_info.green_pos;
	efifb_defined.green.length  = screen_info.green_size;
	efifb_defined.blue.offset   = screen_info.blue_pos;
	efifb_defined.blue.length   = screen_info.blue_size;
	efifb_defined.transp.offset = screen_info.rsvd_pos;
	efifb_defined.transp.length = screen_info.rsvd_size;

	printk(KERN_INFO "efifb: %s: "
	       "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
	       "Truecolor",
	       screen_info.rsvd_size,
	       screen_info.red_size,
	       screen_info.green_size,
	       screen_info.blue_size,
	       screen_info.rsvd_pos,
	       screen_info.red_pos,
	       screen_info.green_pos,
	       screen_info.blue_pos);

	efifb_fix.ypanstep  = 0;
	efifb_fix.ywrapstep = 0;

	info->fbops = &efifb_ops;
	info->var = efifb_defined;
	info->fix = efifb_fix;
	info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE;

	if ((err = fb_alloc_cmap(&info->cmap, 256, 0)) < 0) {
		printk(KERN_ERR "efifb: cannot allocate colormap\n");
		goto err_unmap;
	}
	if ((err = register_framebuffer(info)) < 0) {
		printk(KERN_ERR "efifb: cannot register framebuffer\n");
		goto err_fb_dealoc;
	}
	fb_info(info, "%s frame buffer device\n", info->fix.id);
	return 0;

err_fb_dealoc:
	fb_dealloc_cmap(&info->cmap);
err_unmap:
	iounmap(info->screen_base);
err_release_fb:
	framebuffer_release(info);
err_release_mem:
	if (request_mem_succeeded)
		release_mem_region(efifb_fix.smem_start, size_total);
	return err;
}

static int efifb_remove(struct platform_device *pdev)
{
	struct fb_info *info = platform_get_drvdata(pdev);

	unregister_framebuffer(info);
	framebuffer_release(info);

	return 0;
}

static struct platform_driver efifb_driver = {
	.driver = {
		.name = "efi-framebuffer",
	},
	.probe = efifb_probe,
	.remove = efifb_remove,
};

builtin_platform_driver(efifb_driver);
Commit	Line	Data
7c83172b HY	1	/*
	2	* Framebuffer driver for EFI/UEFI based system
	3	*
	4	* (c) 2006 Edgar Hucek <gimli@dark-green.com>
	5	* Original efi driver written by Gerd Knorr <kraxel@goldbach.in-berlin.de>
	6	*
	7	*/
	8
7c83172b	9	#include <linux/kernel.h>
21289ec0	10	#include <linux/efi.h>
7c83172b HY	11	#include <linux/errno.h>
	12	#include <linux/fb.h>
	13	#include <linux/platform_device.h>
	14	#include <linux/screen_info.h>
7c83172b	15	#include <video/vga.h>
21289ec0	16	#include <asm/efi.h>
7c83172b	17
da0241f1 AL	18	static bool request_mem_succeeded = false;
da0241f1 AL	19
48c68c4f	20	static struct fb_var_screeninfo efifb_defined = {
7c83172b HY	21	.activate = FB_ACTIVATE_NOW,
	22	.height = -1,
	23	.width = -1,
	24	.right_margin = 32,
	25	.upper_margin = 16,
	26	.lower_margin = 4,
	27	.vsync_len = 4,
	28	.vmode = FB_VMODE_NONINTERLACED,
	29	};
	30
48c68c4f	31	static struct fb_fix_screeninfo efifb_fix = {
7c83172b HY	32	.id = "EFI VGA",
	33	.type = FB_TYPE_PACKED_PIXELS,
	34	.accel = FB_ACCEL_NONE,
	35	.visual = FB_VISUAL_TRUECOLOR,
	36	};
	37
	38	static int efifb_setcolreg(unsigned regno, unsigned red, unsigned green,
	39	unsigned blue, unsigned transp,
	40	struct fb_info *info)
	41	{
	42	/*
	43	* Set a single color register. The values supplied are
	44	* already rounded down to the hardware's capabilities
	45	* (according to the entries in the `var' structure). Return
	46	* != 0 for invalid regno.
	47	*/
	48
	49	if (regno >= info->cmap.len)
	50	return 1;
	51
	52	if (regno < 16) {
d50b3f43 MS	53	red >>= 16 - info->var.red.length;
	54	green >>= 16 - info->var.green.length;
	55	blue >>= 16 - info->var.blue.length;
7c83172b HY	56	((u32 *)(info->pseudo_palette))[regno] =
	57	(red << info->var.red.offset) \|
	58	(green << info->var.green.offset) \|
	59	(blue << info->var.blue.offset);
	60	}
	61	return 0;
	62	}
	63
89f3f219 MS	64	static void efifb_destroy(struct fb_info *info)
	65	{
	66	if (info->screen_base)
	67	iounmap(info->screen_base);
da0241f1 AL	68	if (request_mem_succeeded)
	69	release_mem_region(info->apertures->ranges[0].base,
	70	info->apertures->ranges[0].size);
907355a9	71	fb_dealloc_cmap(&info->cmap);
89f3f219 MS	72	}
89f3f219 MS	73
7c83172b HY	74	static struct fb_ops efifb_ops = {
7c83172b HY	75	.owner = THIS_MODULE,
89f3f219	76	.fb_destroy = efifb_destroy,
7c83172b HY	77	.fb_setcolreg = efifb_setcolreg,
	78	.fb_fillrect = cfb_fillrect,
	79	.fb_copyarea = cfb_copyarea,
	80	.fb_imageblit = cfb_imageblit,
	81	};
	82
e6816a8d	83	static int efifb_setup(char *options)
7c08c9ae PJ	84	{
7c08c9ae PJ	85	char *this_opt;
7c08c9ae	86
b4aa0163 MG	87	if (options && *options) {
	88	while ((this_opt = strsep(&options, ",")) != NULL) {
	89	if (!*this_opt) continue;
7c08c9ae	90
21289ec0 AB	91	efifb_setup_from_dmi(&screen_info, this_opt);
21289ec0 AB	92
b4aa0163 MG	93	if (!strncmp(this_opt, "base:", 5))
	94	screen_info.lfb_base = simple_strtoul(this_opt+5, NULL, 0);
	95	else if (!strncmp(this_opt, "stride:", 7))
	96	screen_info.lfb_linelength = simple_strtoul(this_opt+7, NULL, 0) * 4;
	97	else if (!strncmp(this_opt, "height:", 7))
	98	screen_info.lfb_height = simple_strtoul(this_opt+7, NULL, 0);
	99	else if (!strncmp(this_opt, "width:", 6))
	100	screen_info.lfb_width = simple_strtoul(this_opt+6, NULL, 0);
7c08c9ae	101	}
7c08c9ae	102	}
b4aa0163	103
7c08c9ae PJ	104	return 0;
	105	}
	106
ae2ee627 MF	107	static inline bool fb_base_is_valid(void)
	108	{
	109	if (screen_info.lfb_base)
	110	return true;
	111
	112	if (!(screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE))
	113	return false;
	114
	115	if (screen_info.ext_lfb_base)
	116	return true;
	117
	118	return false;
	119	}
	120
e6816a8d	121	static int efifb_probe(struct platform_device *dev)
7c83172b HY	122	{
	123	struct fb_info *info;
	124	int err;
	125	unsigned int size_vmode;
	126	unsigned int size_remap;
	127	unsigned int size_total;
e6816a8d DH	128	char *option = NULL;
	129
	130	if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
	131	return -ENODEV;
	132
	133	if (fb_get_options("efifb", &option))
	134	return -ENODEV;
	135	efifb_setup(option);
	136
	137	/* We don't get linelength from UGA Draw Protocol, only from
	138	* EFI Graphics Protocol. So if it's not in DMI, and it's not
	139	* passed in from the user, we really can't use the framebuffer.
	140	*/
	141	if (!screen_info.lfb_linelength)
	142	return -ENODEV;
7c08c9ae	143
7c08c9ae PJ	144	if (!screen_info.lfb_depth)
	145	screen_info.lfb_depth = 32;
	146	if (!screen_info.pages)
	147	screen_info.pages = 1;
ae2ee627	148	if (!fb_base_is_valid()) {
133bb070 MG	149	printk(KERN_DEBUG "efifb: invalid framebuffer address\n");
	150	return -ENODEV;
	151	}
	152	printk(KERN_INFO "efifb: probing for efifb\n");
7c08c9ae PJ	153
	154	/* just assume they're all unset if any are */
	155	if (!screen_info.blue_size) {
	156	screen_info.blue_size = 8;
	157	screen_info.blue_pos = 0;
	158	screen_info.green_size = 8;
	159	screen_info.green_pos = 8;
	160	screen_info.red_size = 8;
	161	screen_info.red_pos = 16;
	162	screen_info.rsvd_size = 8;
	163	screen_info.rsvd_pos = 24;
	164	}
7c83172b HY	165
7c83172b HY	166	efifb_fix.smem_start = screen_info.lfb_base;
ae2ee627 MF	167
	168	if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE) {
	169	u64 ext_lfb_base;
	170
	171	ext_lfb_base = (u64)(unsigned long)screen_info.ext_lfb_base << 32;
	172	efifb_fix.smem_start \|= ext_lfb_base;
	173	}
	174
7c83172b HY	175	efifb_defined.bits_per_pixel = screen_info.lfb_depth;
	176	efifb_defined.xres = screen_info.lfb_width;
	177	efifb_defined.yres = screen_info.lfb_height;
	178	efifb_fix.line_length = screen_info.lfb_linelength;
	179
	180	/* size_vmode -- that is the amount of memory needed for the
	181	* used video mode, i.e. the minimum amount of
	182	* memory we need. */
	183	size_vmode = efifb_defined.yres * efifb_fix.line_length;
	184
	185	/* size_total -- all video memory we have. Used for
	186	* entries, ressource allocation and bounds
	187	* checking. */
	188	size_total = screen_info.lfb_size;
	189	if (size_total < size_vmode)
	190	size_total = size_vmode;
	191
	192	/* size_remap -- the amount of video memory we are going to
	193	* use for efifb. With modern cards it is no
	194	* option to simply use size_total as that
	195	* wastes plenty of kernel address space. */
	196	size_remap = size_vmode * 2;
7c83172b HY	197	if (size_remap > size_total)
7c83172b HY	198	size_remap = size_total;
7c08c9ae PJ	199	if (size_remap % PAGE_SIZE)
7c08c9ae PJ	200	size_remap += PAGE_SIZE - (size_remap % PAGE_SIZE);
7c83172b HY	201	efifb_fix.smem_len = size_remap;
7c83172b HY	202
7c08c9ae	203	if (request_mem_region(efifb_fix.smem_start, size_remap, "efifb")) {
da0241f1	204	request_mem_succeeded = true;
7c08c9ae	205	} else {
7c83172b HY	206	/* We cannot make this fatal. Sometimes this comes from magic
	207	spaces our resource handlers simply don't know about */
	208	printk(KERN_WARNING
	209	"efifb: cannot reserve video memory at 0x%lx\n",
	210	efifb_fix.smem_start);
7c08c9ae	211	}
7c83172b HY	212
	213	info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
	214	if (!info) {
7c08c9ae	215	printk(KERN_ERR "efifb: cannot allocate framebuffer\n");
7c83172b HY	216	err = -ENOMEM;
	217	goto err_release_mem;
	218	}
65b4021e	219	platform_set_drvdata(dev, info);
7c83172b HY	220	info->pseudo_palette = info->par;
	221	info->par = NULL;
	222
1471ca9a MS	223	info->apertures = alloc_apertures(1);
	224	if (!info->apertures) {
	225	err = -ENOMEM;
	226	goto err_release_fb;
	227	}
	228	info->apertures->ranges[0].base = efifb_fix.smem_start;
	229	info->apertures->ranges[0].size = size_remap;
4410f391	230
3c004b4f	231	info->screen_base = ioremap_wc(efifb_fix.smem_start, efifb_fix.smem_len);
7c83172b HY	232	if (!info->screen_base) {
	233	printk(KERN_ERR "efifb: abort, cannot ioremap video memory "
	234	"0x%x @ 0x%lx\n",
	235	efifb_fix.smem_len, efifb_fix.smem_start);
	236	err = -EIO;
7c08c9ae	237	goto err_release_fb;
7c83172b HY	238	}
7c83172b HY	239
a53dd258 AL	240	printk(KERN_INFO "efifb: framebuffer at 0x%lx, using %dk, total %dk\n",
a53dd258 AL	241	efifb_fix.smem_start, size_remap/1024, size_total/1024);
7c83172b HY	242	printk(KERN_INFO "efifb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
	243	efifb_defined.xres, efifb_defined.yres,
	244	efifb_defined.bits_per_pixel, efifb_fix.line_length,
	245	screen_info.pages);
	246
	247	efifb_defined.xres_virtual = efifb_defined.xres;
	248	efifb_defined.yres_virtual = efifb_fix.smem_len /
	249	efifb_fix.line_length;
	250	printk(KERN_INFO "efifb: scrolling: redraw\n");
	251	efifb_defined.yres_virtual = efifb_defined.yres;
	252
	253	/* some dummy values for timing to make fbset happy */
	254	efifb_defined.pixclock = 10000000 / efifb_defined.xres *
	255	1000 / efifb_defined.yres;
	256	efifb_defined.left_margin = (efifb_defined.xres / 8) & 0xf8;
	257	efifb_defined.hsync_len = (efifb_defined.xres / 8) & 0xf8;
	258
	259	efifb_defined.red.offset = screen_info.red_pos;
	260	efifb_defined.red.length = screen_info.red_size;
	261	efifb_defined.green.offset = screen_info.green_pos;
	262	efifb_defined.green.length = screen_info.green_size;
	263	efifb_defined.blue.offset = screen_info.blue_pos;
	264	efifb_defined.blue.length = screen_info.blue_size;
	265	efifb_defined.transp.offset = screen_info.rsvd_pos;
	266	efifb_defined.transp.length = screen_info.rsvd_size;
	267
	268	printk(KERN_INFO "efifb: %s: "
	269	"size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
	270	"Truecolor",
	271	screen_info.rsvd_size,
	272	screen_info.red_size,
	273	screen_info.green_size,
	274	screen_info.blue_size,
	275	screen_info.rsvd_pos,
	276	screen_info.red_pos,
	277	screen_info.green_pos,
	278	screen_info.blue_pos);
	279
	280	efifb_fix.ypanstep = 0;
	281	efifb_fix.ywrapstep = 0;
	282
	283	info->fbops = &efifb_ops;
	284	info->var = efifb_defined;
	285	info->fix = efifb_fix;
4410f391	286	info->flags = FBINFO_FLAG_DEFAULT \| FBINFO_MISC_FIRMWARE;
7c83172b	287
7c08c9ae PJ	288	if ((err = fb_alloc_cmap(&info->cmap, 256, 0)) < 0) {
7c08c9ae PJ	289	printk(KERN_ERR "efifb: cannot allocate colormap\n");
7c83172b HY	290	goto err_unmap;
7c83172b HY	291	}
7c08c9ae PJ	292	if ((err = register_framebuffer(info)) < 0) {
7c08c9ae PJ	293	printk(KERN_ERR "efifb: cannot register framebuffer\n");
7c83172b HY	294	goto err_fb_dealoc;
7c83172b HY	295	}
31b6780c	296	fb_info(info, "%s frame buffer device\n", info->fix.id);
7c83172b HY	297	return 0;
	298
	299	err_fb_dealoc:
	300	fb_dealloc_cmap(&info->cmap);
	301	err_unmap:
	302	iounmap(info->screen_base);
7c08c9ae	303	err_release_fb:
7c83172b HY	304	framebuffer_release(info);
7c83172b HY	305	err_release_mem:
da0241f1	306	if (request_mem_succeeded)
7c08c9ae	307	release_mem_region(efifb_fix.smem_start, size_total);
7c83172b HY	308	return err;
	309	}
	310
65b4021e DH	311	static int efifb_remove(struct platform_device *pdev)
	312	{
	313	struct fb_info *info = platform_get_drvdata(pdev);
	314
	315	unregister_framebuffer(info);
	316	framebuffer_release(info);
	317
	318	return 0;
	319	}
	320
7c83172b	321	static struct platform_driver efifb_driver = {
e6816a8d DH	322	.driver = {
e6816a8d DH	323	.name = "efi-framebuffer",
7c83172b	324	},
e6816a8d	325	.probe = efifb_probe,
65b4021e	326	.remove = efifb_remove,
7c83172b HY	327	};
7c83172b HY	328
07ea7ec5	329	builtin_platform_driver(efifb_driver);