1 files changed, 754 insertions, 0 deletions

diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
new file mode 100644
index 000000000000..eff757ebbed1
--- /dev/null
+++ b/drivers/video/fbdev/core/fbmem.c
@@ -0,0 +1,754 @@
+/*
+ *  linux/drivers/video/fbmem.c
+ *
+ *  Copyright (C) 1994 Martin Schaller
+ *
+ *	2001 - Documented with DocBook
+ *	- Brad Douglas <brad@neruo.com>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file COPYING in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/console.h>
+#include <linux/export.h>
+#include <linux/fb.h>
+#include <linux/fbcon.h>
+#include <linux/lcd.h>
+#include <linux/leds.h>
+
+#include <video/nomodeset.h>
+
+#include "fb_internal.h"
+
+    /*
+     *  Frame buffer device initialization and setup routines
+     */
+
+#define FBPIXMAPSIZE	(1024 * 8)
+
+struct class *fb_class;
+
+DEFINE_MUTEX(registration_lock);
+struct fb_info *registered_fb[FB_MAX] __read_mostly;
+int num_registered_fb __read_mostly;
+#define for_each_registered_fb(i)		\
+	for (i = 0; i < FB_MAX; i++)		\
+		if (!registered_fb[i]) {} else
+
+struct fb_info *get_fb_info(unsigned int idx)
+{
+	struct fb_info *fb_info;
+
+	if (idx >= FB_MAX)
+		return ERR_PTR(-ENODEV);
+
+	mutex_lock(&registration_lock);
+	fb_info = registered_fb[idx];
+	if (fb_info)
+		refcount_inc(&fb_info->count);
+	mutex_unlock(&registration_lock);
+
+	return fb_info;
+}
+
+void put_fb_info(struct fb_info *fb_info)
+{
+	if (!refcount_dec_and_test(&fb_info->count))
+		return;
+	if (fb_info->fbops->fb_destroy)
+		fb_info->fbops->fb_destroy(fb_info);
+}
+
+/*
+ * Helpers
+ */
+
+int fb_get_color_depth(struct fb_var_screeninfo *var,
+		       struct fb_fix_screeninfo *fix)
+{
+	int depth = 0;
+
+	if (fix->visual == FB_VISUAL_MONO01 ||
+	    fix->visual == FB_VISUAL_MONO10)
+		depth = 1;
+	else {
+		if (var->green.length == var->blue.length &&
+		    var->green.length == var->red.length &&
+		    var->green.offset == var->blue.offset &&
+		    var->green.offset == var->red.offset)
+			depth = var->green.length;
+		else
+			depth = var->green.length + var->red.length +
+				var->blue.length;
+	}
+
+	return depth;
+}
+EXPORT_SYMBOL(fb_get_color_depth);
+
+/*
+ * Data padding functions.
+ */
+void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
+{
+	__fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
+}
+EXPORT_SYMBOL(fb_pad_aligned_buffer);
+
+void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
+				u32 shift_high, u32 shift_low, u32 mod)
+{
+	u8 mask = (u8) (0xfff << shift_high), tmp;
+	int i, j;
+
+	for (i = height; i--; ) {
+		for (j = 0; j < idx; j++) {
+			tmp = dst[j];
+			tmp &= mask;
+			tmp |= *src >> shift_low;
+			dst[j] = tmp;
+			tmp = *src << shift_high;
+			dst[j+1] = tmp;
+			src++;
+		}
+		tmp = dst[idx];
+		tmp &= mask;
+		tmp |= *src >> shift_low;
+		dst[idx] = tmp;
+		if (shift_high < mod) {
+			tmp = *src << shift_high;
+			dst[idx+1] = tmp;
+		}
+		src++;
+		dst += d_pitch;
+	}
+}
+EXPORT_SYMBOL(fb_pad_unaligned_buffer);
+
+/*
+ * we need to lock this section since fb_cursor
+ * may use fb_imageblit()
+ */
+char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
+{
+	u32 align = buf->buf_align - 1, offset;
+	char *addr = buf->addr;
+
+	/* If IO mapped, we need to sync before access, no sharing of
+	 * the pixmap is done
+	 */
+	if (buf->flags & FB_PIXMAP_IO) {
+		if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
+			info->fbops->fb_sync(info);
+		return addr;
+	}
+
+	/* See if we fit in the remaining pixmap space */
+	offset = buf->offset + align;
+	offset &= ~align;
+	if (offset + size > buf->size) {
+		/* We do not fit. In order to be able to re-use the buffer,
+		 * we must ensure no asynchronous DMA'ing or whatever operation
+		 * is in progress, we sync for that.
+		 */
+		if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
+			info->fbops->fb_sync(info);
+		offset = 0;
+	}
+	buf->offset = offset + size;
+	addr += offset;
+
+	return addr;
+}
+EXPORT_SYMBOL(fb_get_buffer_offset);
+
+int
+fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
+{
+	struct fb_fix_screeninfo *fix = &info->fix;
+	unsigned int yres = info->var.yres;
+	int err = 0;
+
+	if (var->yoffset > 0) {
+		if (var->vmode & FB_VMODE_YWRAP) {
+			if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
+				err = -EINVAL;
+			else
+				yres = 0;
+		} else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
+			err = -EINVAL;
+	}
+
+	if (var->xoffset > 0 && (!fix->xpanstep ||
+				 (var->xoffset % fix->xpanstep)))
+		err = -EINVAL;
+
+	if (err || !info->fbops->fb_pan_display ||
+	    var->yoffset > info->var.yres_virtual - yres ||
+	    var->xoffset > info->var.xres_virtual - info->var.xres)
+		return -EINVAL;
+
+	if ((err = info->fbops->fb_pan_display(var, info)))
+		return err;
+	info->var.xoffset = var->xoffset;
+	info->var.yoffset = var->yoffset;
+	if (var->vmode & FB_VMODE_YWRAP)
+		info->var.vmode |= FB_VMODE_YWRAP;
+	else
+		info->var.vmode &= ~FB_VMODE_YWRAP;
+	return 0;
+}
+EXPORT_SYMBOL(fb_pan_display);
+
+static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
+			 u32 activate)
+{
+	struct fb_blit_caps caps, fbcaps;
+	int err = 0;
+
+	memset(&caps, 0, sizeof(caps));
+	memset(&fbcaps, 0, sizeof(fbcaps));
+	caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
+	fbcon_get_requirement(info, &caps);
+	info->fbops->fb_get_caps(info, &fbcaps, var);
+
+	if (!bitmap_subset(caps.x, fbcaps.x, FB_MAX_BLIT_WIDTH) ||
+	    !bitmap_subset(caps.y, fbcaps.y, FB_MAX_BLIT_HEIGHT) ||
+	    (fbcaps.len < caps.len))
+		err = -EINVAL;
+
+	return err;
+}
+
+static void fb_lcd_notify_mode_change(struct fb_info *info,
+				      struct fb_videomode *mode)
+{
+	lcd_notify_mode_change_all(info->device, mode->xres, mode->yres);
+}
+
+int
+fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
+{
+	int ret = 0;
+	u32 activate;
+	struct fb_var_screeninfo old_var;
+	struct fb_videomode mode;
+	u32 unused;
+
+	if (var->activate & FB_ACTIVATE_INV_MODE) {
+		struct fb_videomode mode1, mode2;
+
+		fb_var_to_videomode(&mode1, var);
+		fb_var_to_videomode(&mode2, &info->var);
+		/* make sure we don't delete the videomode of current var */
+		ret = fb_mode_is_equal(&mode1, &mode2);
+		if (!ret) {
+			ret = fbcon_mode_deleted(info, &mode1);
+			if (!ret)
+				fb_delete_videomode(&mode1, &info->modelist);
+		}
+
+		return ret ? -EINVAL : 0;
+	}
+
+	if (!(var->activate & FB_ACTIVATE_FORCE) &&
+	    !memcmp(&info->var, var, sizeof(struct fb_var_screeninfo)))
+		return 0;
+
+	activate = var->activate;
+
+	/* When using FOURCC mode, make sure the red, green, blue and
+	 * transp fields are set to 0.
+	 */
+	if ((info->fix.capabilities & FB_CAP_FOURCC) &&
+	    var->grayscale > 1) {
+		if (var->red.offset     || var->green.offset    ||
+		    var->blue.offset    || var->transp.offset   ||
+		    var->red.length     || var->green.length    ||
+		    var->blue.length    || var->transp.length   ||
+		    var->red.msb_right  || var->green.msb_right ||
+		    var->blue.msb_right || var->transp.msb_right)
+			return -EINVAL;
+	}
+
+	if (!info->fbops->fb_check_var) {
+		*var = info->var;
+		return 0;
+	}
+
+	/* bitfill_aligned() assumes that it's at least 8x8 */
+	if (var->xres < 8 || var->yres < 8)
+		return -EINVAL;
+
+	/* Too huge resolution causes multiplication overflow. */
+	if (check_mul_overflow(var->xres, var->yres, &unused) ||
+	    check_mul_overflow(var->xres_virtual, var->yres_virtual, &unused))
+		return -EINVAL;
+
+	ret = info->fbops->fb_check_var(var, info);
+
+	if (ret)
+		return ret;
+
+	/* verify that virtual resolution >= physical resolution */
+	if (var->xres_virtual < var->xres ||
+	    var->yres_virtual < var->yres) {
+		pr_warn("WARNING: fbcon: Driver '%s' missed to adjust virtual screen size (%ux%u vs. %ux%u)\n",
+			info->fix.id,
+			var->xres_virtual, var->yres_virtual,
+			var->xres, var->yres);
+		return -EINVAL;
+	}
+
+	if ((var->activate & FB_ACTIVATE_MASK) != FB_ACTIVATE_NOW)
+		return 0;
+
+	if (info->fbops->fb_get_caps) {
+		ret = fb_check_caps(info, var, activate);
+
+		if (ret)
+			return ret;
+	}
+
+	old_var = info->var;
+	info->var = *var;
+
+	if (info->fbops->fb_set_par) {
+		ret = info->fbops->fb_set_par(info);
+
+		if (ret) {
+			info->var = old_var;
+			printk(KERN_WARNING "detected "
+				"fb_set_par error, "
+				"error code: %d\n", ret);
+			return ret;
+		}
+	}
+
+	fb_pan_display(info, &info->var);
+	fb_set_cmap(&info->cmap, info);
+	fb_var_to_videomode(&mode, &info->var);
+
+	if (info->modelist.prev && info->modelist.next &&
+	    !list_empty(&info->modelist))
+		ret = fb_add_videomode(&mode, &info->modelist);
+
+	if (ret) {
+		info->var = old_var;
+		return ret;
+	}
+
+	fb_lcd_notify_mode_change(info, &mode);
+
+	return 0;
+}
+EXPORT_SYMBOL(fb_set_var);
+
+static void fb_lcd_notify_blank(struct fb_info *info)
+{
+	int power;
+
+	switch (info->blank) {
+	case FB_BLANK_UNBLANK:
+		power = LCD_POWER_ON;
+		break;
+	/* deprecated; TODO: should become 'off' */
+	case FB_BLANK_NORMAL:
+		power = LCD_POWER_REDUCED;
+		break;
+	case FB_BLANK_VSYNC_SUSPEND:
+		power = LCD_POWER_REDUCED_VSYNC_SUSPEND;
+		break;
+	/* 'off' */
+	case FB_BLANK_HSYNC_SUSPEND:
+	case FB_BLANK_POWERDOWN:
+	default:
+		power = LCD_POWER_OFF;
+		break;
+	}
+
+	lcd_notify_blank_all(info->device, power);
+}
+
+static void fb_ledtrig_backlight_notify_blank(struct fb_info *info)
+{
+	if (info->blank == FB_BLANK_UNBLANK)
+		ledtrig_backlight_blank(false);
+	else
+		ledtrig_backlight_blank(true);
+}
+
+int fb_blank(struct fb_info *info, int blank)
+{
+	int old_blank = info->blank;
+	int ret;
+
+	if (!info->fbops->fb_blank)
+		return -EINVAL;
+
+	if (blank > FB_BLANK_POWERDOWN)
+		blank = FB_BLANK_POWERDOWN;
+
+	info->blank = blank;
+
+	ret = info->fbops->fb_blank(blank, info);
+	if (ret)
+		goto err;
+
+	fb_bl_notify_blank(info, old_blank);
+	fb_lcd_notify_blank(info);
+	fb_ledtrig_backlight_notify_blank(info);
+
+	return 0;
+
+err:
+	info->blank = old_blank;
+	return ret;
+}
+EXPORT_SYMBOL(fb_blank);
+
+static int fb_check_foreignness(struct fb_info *fi)
+{
+	const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
+
+	fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
+
+#ifdef __BIG_ENDIAN
+	fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
+#else
+	fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
+#endif /* __BIG_ENDIAN */
+
+	if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
+		pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
+		       "support this framebuffer\n", fi->fix.id);
+		return -ENOSYS;
+	} else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
+		pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
+		       "support this framebuffer\n", fi->fix.id);
+		return -ENOSYS;
+	}
+
+	return 0;
+}
+
+static int do_register_framebuffer(struct fb_info *fb_info)
+{
+	int i, err = 0;
+	struct fb_videomode mode;
+
+	if (fb_check_foreignness(fb_info))
+		return -ENOSYS;
+
+	if (num_registered_fb == FB_MAX)
+		return -ENXIO;
+
+	for (i = 0 ; i < FB_MAX; i++)
+		if (!registered_fb[i])
+			break;
+
+	if (i >= FB_MAX)
+		return -ENXIO;
+
+	if (!fb_info->modelist.prev || !fb_info->modelist.next)
+		INIT_LIST_HEAD(&fb_info->modelist);
+
+	fb_var_to_videomode(&mode, &fb_info->var);
+	err = fb_add_videomode(&mode, &fb_info->modelist);
+	if (err < 0)
+		return err;
+
+	fb_info->node = i;
+	refcount_set(&fb_info->count, 1);
+	mutex_init(&fb_info->lock);
+	mutex_init(&fb_info->mm_lock);
+
+	/*
+	 * With an fb_blank callback present, we assume that the
+	 * display is blank, so that fb_blank() enables it on the
+	 * first modeset.
+	 */
+	if (fb_info->fbops->fb_blank)
+		fb_info->blank = FB_BLANK_POWERDOWN;
+
+	fb_device_create(fb_info);
+
+	if (fb_info->pixmap.addr == NULL) {
+		fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
+		if (fb_info->pixmap.addr) {
+			fb_info->pixmap.size = FBPIXMAPSIZE;
+			fb_info->pixmap.buf_align = 1;
+			fb_info->pixmap.scan_align = 1;
+			fb_info->pixmap.access_align = 32;
+			fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
+		}
+	}
+	fb_info->pixmap.offset = 0;
+
+	if (bitmap_empty(fb_info->pixmap.blit_x, FB_MAX_BLIT_WIDTH))
+		bitmap_fill(fb_info->pixmap.blit_x, FB_MAX_BLIT_WIDTH);
+
+	if (bitmap_empty(fb_info->pixmap.blit_y, FB_MAX_BLIT_HEIGHT))
+		bitmap_fill(fb_info->pixmap.blit_y, FB_MAX_BLIT_HEIGHT);
+
+	if (fb_info->skip_vt_switch)
+		pm_vt_switch_required(fb_info->device, false);
+	else
+		pm_vt_switch_required(fb_info->device, true);
+
+	num_registered_fb++;
+	registered_fb[i] = fb_info;
+
+#ifdef CONFIG_GUMSTIX_AM200EPD
+	{
+		struct fb_event event;
+		event.info = fb_info;
+		fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
+	}
+#endif
+
+	return fbcon_fb_registered(fb_info);
+}
+
+static void unbind_console(struct fb_info *fb_info)
+{
+	int i = fb_info->node;
+
+	if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info))
+		return;
+
+	fbcon_fb_unbind(fb_info);
+}
+
+static void unlink_framebuffer(struct fb_info *fb_info)
+{
+	int i;
+
+	i = fb_info->node;
+	if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info))
+		return;
+
+	fb_device_destroy(fb_info);
+	pm_vt_switch_unregister(fb_info->device);
+	unbind_console(fb_info);
+}
+
+static void do_unregister_framebuffer(struct fb_info *fb_info)
+{
+	unlink_framebuffer(fb_info);
+	if (fb_info->pixmap.addr &&
+	    (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT)) {
+		kfree(fb_info->pixmap.addr);
+		fb_info->pixmap.addr = NULL;
+	}
+
+	fbcon_delete_modelist(&fb_info->modelist);
+	fb_destroy_modelist(&fb_info->modelist);
+	registered_fb[fb_info->node] = NULL;
+	num_registered_fb--;
+#ifdef CONFIG_GUMSTIX_AM200EPD
+	{
+		struct fb_event event;
+		event.info = fb_info;
+		fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
+	}
+#endif
+	fbcon_fb_unregistered(fb_info);
+
+	/* this may free fb info */
+	put_fb_info(fb_info);
+}
+
+/**
+ *	register_framebuffer - registers a frame buffer device
+ *	@fb_info: frame buffer info structure
+ *
+ *	Registers a frame buffer device @fb_info.
+ *
+ *	Returns negative errno on error, or zero for success.
+ *
+ */
+int
+register_framebuffer(struct fb_info *fb_info)
+{
+	int ret;
+
+	mutex_lock(&registration_lock);
+	ret = do_register_framebuffer(fb_info);
+	mutex_unlock(&registration_lock);
+
+	return ret;
+}
+EXPORT_SYMBOL(register_framebuffer);
+
+/**
+ *	unregister_framebuffer - releases a frame buffer device
+ *	@fb_info: frame buffer info structure
+ *
+ *	Unregisters a frame buffer device @fb_info.
+ *
+ *	Returns negative errno on error, or zero for success.
+ *
+ *      This function will also notify the framebuffer console
+ *      to release the driver.
+ *
+ *      This is meant to be called within a driver's module_exit()
+ *      function. If this is called outside module_exit(), ensure
+ *      that the driver implements fb_open() and fb_release() to
+ *      check that no processes are using the device.
+ */
+void
+unregister_framebuffer(struct fb_info *fb_info)
+{
+	mutex_lock(&registration_lock);
+	do_unregister_framebuffer(fb_info);
+	mutex_unlock(&registration_lock);
+}
+EXPORT_SYMBOL(unregister_framebuffer);
+
+static void devm_unregister_framebuffer(void *data)
+{
+	struct fb_info *info = data;
+
+	unregister_framebuffer(info);
+}
+
+/**
+ *	devm_register_framebuffer - resource-managed frame buffer device registration
+ *	@dev: device the framebuffer belongs to
+ *	@fb_info: frame buffer info structure
+ *
+ *	Registers a frame buffer device @fb_info to device @dev.
+ *
+ *	Returns negative errno on error, or zero for success.
+ *
+ */
+int
+devm_register_framebuffer(struct device *dev, struct fb_info *fb_info)
+{
+	int ret;
+
+	ret = register_framebuffer(fb_info);
+	if (ret)
+		return ret;
+
+	return devm_add_action_or_reset(dev, devm_unregister_framebuffer, fb_info);
+}
+EXPORT_SYMBOL(devm_register_framebuffer);
+
+/**
+ *	fb_set_suspend - low level driver signals suspend
+ *	@info: framebuffer affected
+ *	@state: 0 = resuming, !=0 = suspending
+ *
+ *	This is meant to be used by low level drivers to
+ * 	signal suspend/resume to the core & clients.
+ *	It must be called with the console semaphore held
+ */
+void fb_set_suspend(struct fb_info *info, int state)
+{
+	WARN_CONSOLE_UNLOCKED();
+
+	if (state) {
+		fbcon_suspended(info);
+		info->state = FBINFO_STATE_SUSPENDED;
+	} else {
+		info->state = FBINFO_STATE_RUNNING;
+		fbcon_resumed(info);
+	}
+}
+EXPORT_SYMBOL(fb_set_suspend);
+
+static int __init fbmem_init(void)
+{
+	int ret;
+
+	fb_class = class_create("graphics");
+	if (IS_ERR(fb_class)) {
+		ret = PTR_ERR(fb_class);
+		pr_err("Unable to create fb class; errno = %d\n", ret);
+		goto err_fb_class;
+	}
+
+	ret = fb_init_procfs();
+	if (ret)
+		goto err_class_destroy;
+
+	ret = fb_register_chrdev();
+	if (ret)
+		goto err_fb_cleanup_procfs;
+
+	fb_console_init();
+
+	return 0;
+
+err_fb_cleanup_procfs:
+	fb_cleanup_procfs();
+err_class_destroy:
+	class_destroy(fb_class);
+err_fb_class:
+	fb_class = NULL;
+	return ret;
+}
+
+#ifdef MODULE
+static void __exit fbmem_exit(void)
+{
+	fb_console_exit();
+	fb_unregister_chrdev();
+	fb_cleanup_procfs();
+	class_destroy(fb_class);
+}
+
+module_init(fbmem_init);
+module_exit(fbmem_exit);
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Framebuffer base");
+#else
+subsys_initcall(fbmem_init);
+#endif
+
+int fb_new_modelist(struct fb_info *info)
+{
+	struct fb_var_screeninfo var = info->var;
+	struct list_head *pos, *n;
+	struct fb_modelist *modelist;
+	struct fb_videomode *m, mode;
+	int err;
+
+	list_for_each_safe(pos, n, &info->modelist) {
+		modelist = list_entry(pos, struct fb_modelist, list);
+		m = &modelist->mode;
+		fb_videomode_to_var(&var, m);
+		var.activate = FB_ACTIVATE_TEST;
+		err = fb_set_var(info, &var);
+		fb_var_to_videomode(&mode, &var);
+		if (err || !fb_mode_is_equal(m, &mode)) {
+			list_del(pos);
+			kfree(pos);
+		}
+	}
+
+	if (list_empty(&info->modelist))
+		return 1;
+
+	fbcon_new_modelist(info);
+
+	return 0;
+}
+
+bool fb_modesetting_disabled(const char *drvname)
+{
+	bool fwonly = video_firmware_drivers_only();
+
+	if (fwonly)
+		pr_warn("Driver %s not loading because of nomodeset parameter\n",
+			drvname);
+
+	return fwonly;
+}
+EXPORT_SYMBOL(fb_modesetting_disabled);
+
+MODULE_LICENSE("GPL");