bfin-t350mcqb-fb.c

Linux环境下视频显示卡设备的驱动程序源代码

		if (regno > 16)
			return -EINVAL;

		red >>= (16 - info->var.red.length);
		green >>= (16 - info->var.green.length);
		blue >>= (16 - info->var.blue.length);

		value = (red << info->var.red.offset) |
		    (green << info->var.green.offset) |
		    (blue << info->var.blue.offset);
		value &= 0xFFFFFF;

		((u32 *) (info->pseudo_palette))[regno] = value;

	}

	return 0;
}

static struct fb_ops bfin_t350mcqb_fb_ops = {
	.owner = THIS_MODULE,
	.fb_open = bfin_t350mcqb_fb_open,
	.fb_release = bfin_t350mcqb_fb_release,
	.fb_check_var = bfin_t350mcqb_fb_check_var,
	.fb_fillrect = cfb_fillrect,
	.fb_copyarea = cfb_copyarea,
	.fb_imageblit = cfb_imageblit,
	.fb_mmap = bfin_t350mcqb_fb_mmap,
	.fb_cursor = bfin_t350mcqb_fb_cursor,
	.fb_setcolreg = bfin_t350mcqb_fb_setcolreg,
};

#ifndef NO_BL_SUPPORT
static int bl_get_brightness(struct backlight_device *bd)
{
	return 0;
}

static struct backlight_ops bfin_lq043fb_bl_ops = {
	.get_brightness = bl_get_brightness,
};

static struct backlight_device *bl_dev;

static int bfin_lcd_get_power(struct lcd_device *dev)
{
	return 0;
}

static int bfin_lcd_set_power(struct lcd_device *dev, int power)
{
	return 0;
}

static int bfin_lcd_get_contrast(struct lcd_device *dev)
{
	return 0;
}

static int bfin_lcd_set_contrast(struct lcd_device *dev, int contrast)
{

	return 0;
}

static int bfin_lcd_check_fb(struct lcd_device *dev, struct fb_info *fi)
{
	if (!fi || (fi == &bfin_t350mcqb_fb))
		return 1;
	return 0;
}

static struct lcd_ops bfin_lcd_ops = {
	.get_power = bfin_lcd_get_power,
	.set_power = bfin_lcd_set_power,
	.get_contrast = bfin_lcd_get_contrast,
	.set_contrast = bfin_lcd_set_contrast,
	.check_fb = bfin_lcd_check_fb,
};

static struct lcd_device *lcd_dev;
#endif

static irqreturn_t bfin_t350mcqb_irq_error(int irq, void *dev_id)
{
	/*struct bfin_t350mcqbfb_info *info = (struct bfin_t350mcqbfb_info *)dev_id;*/

	u16 status = bfin_read_PPI_STATUS();
	bfin_write_PPI_STATUS(0xFFFF);

	if (status) {
		bfin_t350mcqb_disable_ppi();
		disable_dma(CH_PPI);

		/* start dma */
		enable_dma(CH_PPI);
		bfin_t350mcqb_enable_ppi();
		bfin_write_PPI_STATUS(0xFFFF);
	}

	return IRQ_HANDLED;
}

static int __devinit bfin_t350mcqb_probe(struct platform_device *pdev)
{
	struct bfin_t350mcqbfb_info *info;
	struct fb_info *fbinfo;
	int ret;

	printk(KERN_INFO DRIVER_NAME ": %dx%d %d-bit RGB FrameBuffer initializing...\n",
					 LCD_X_RES, LCD_Y_RES, LCD_BPP);

	if (request_dma(CH_PPI, "CH_PPI") < 0) {
		printk(KERN_ERR DRIVER_NAME
		       ": couldn't request CH_PPI DMA\n");
		ret = -EFAULT;
		goto out1;
	}

	fbinfo =
	    framebuffer_alloc(sizeof(struct bfin_t350mcqbfb_info), &pdev->dev);
	if (!fbinfo) {
		ret = -ENOMEM;
		goto out2;
	}

	info = fbinfo->par;
	info->fb = fbinfo;
	info->dev = &pdev->dev;

	platform_set_drvdata(pdev, fbinfo);

	strcpy(fbinfo->fix.id, driver_name);

	fbinfo->fix.type = FB_TYPE_PACKED_PIXELS;
	fbinfo->fix.type_aux = 0;
	fbinfo->fix.xpanstep = 0;
	fbinfo->fix.ypanstep = 0;
	fbinfo->fix.ywrapstep = 0;
	fbinfo->fix.accel = FB_ACCEL_NONE;
	fbinfo->fix.visual = FB_VISUAL_TRUECOLOR;

	fbinfo->var.nonstd = 0;
	fbinfo->var.activate = FB_ACTIVATE_NOW;
	fbinfo->var.height = -1;
	fbinfo->var.width = -1;
	fbinfo->var.accel_flags = 0;
	fbinfo->var.vmode = FB_VMODE_NONINTERLACED;

	fbinfo->var.xres = LCD_X_RES;
	fbinfo->var.xres_virtual = LCD_X_RES;
	fbinfo->var.yres = LCD_Y_RES;
	fbinfo->var.yres_virtual = LCD_Y_RES;
	fbinfo->var.bits_per_pixel = LCD_BPP;

	fbinfo->var.red.offset = 0;
	fbinfo->var.green.offset = 8;
	fbinfo->var.blue.offset = 16;
	fbinfo->var.transp.offset = 0;
	fbinfo->var.red.length = 8;
	fbinfo->var.green.length = 8;
	fbinfo->var.blue.length = 8;
	fbinfo->var.transp.length = 0;
	fbinfo->fix.smem_len = LCD_X_RES * LCD_Y_RES * LCD_BPP / 8;

	fbinfo->fix.line_length = fbinfo->var.xres_virtual *
	    fbinfo->var.bits_per_pixel / 8;


	fbinfo->fbops = &bfin_t350mcqb_fb_ops;
	fbinfo->flags = FBINFO_FLAG_DEFAULT;

	info->fb_buffer =
	    dma_alloc_coherent(NULL, fbinfo->fix.smem_len, &info->dma_handle,
			       GFP_KERNEL);

	if (NULL == info->fb_buffer) {
		printk(KERN_ERR DRIVER_NAME
		       ": couldn't allocate dma buffer.\n");
		ret = -ENOMEM;
		goto out3;
	}

	memset(info->fb_buffer, 0, fbinfo->fix.smem_len);

	fbinfo->screen_base = (void *)info->fb_buffer + ACTIVE_VIDEO_MEM_OFFSET;
	fbinfo->fix.smem_start = (int)info->fb_buffer + ACTIVE_VIDEO_MEM_OFFSET;

	fbinfo->fbops = &bfin_t350mcqb_fb_ops;

	fbinfo->pseudo_palette = &info->pseudo_pal;

	if (fb_alloc_cmap(&fbinfo->cmap, BFIN_LCD_NBR_PALETTE_ENTRIES, 0)
	    < 0) {
		printk(KERN_ERR DRIVER_NAME
		       "Fail to allocate colormap (%d entries)\n",
		       BFIN_LCD_NBR_PALETTE_ENTRIES);
		ret = -EFAULT;
		goto out4;
	}

	if (bfin_t350mcqb_request_ports(1)) {
		printk(KERN_ERR DRIVER_NAME ": couldn't request gpio port.\n");
		ret = -EFAULT;
		goto out6;
	}

	info->irq = platform_get_irq(pdev, 0);
	if (info->irq < 0) {
		ret = -EINVAL;
		goto out7;
	}

	ret = request_irq(info->irq, bfin_t350mcqb_irq_error, IRQF_DISABLED,
			"PPI ERROR", info);
	if (ret < 0) {
		printk(KERN_ERR DRIVER_NAME
		       ": unable to request PPI ERROR IRQ\n");
		goto out7;
	}

	if (register_framebuffer(fbinfo) < 0) {
		printk(KERN_ERR DRIVER_NAME
		       ": unable to register framebuffer.\n");
		ret = -EINVAL;
		goto out8;
	}
#ifndef NO_BL_SUPPORT
	bl_dev =
	    backlight_device_register("bf52x-bl", NULL, NULL,
				      &bfin_lq043fb_bl_ops);
	bl_dev->props.max_brightness = 255;

	lcd_dev = lcd_device_register(DRIVER_NAME, NULL, &bfin_lcd_ops);
	lcd_dev->props.max_contrast = 255, printk(KERN_INFO "Done.\n");
#endif

	return 0;

out8:
	free_irq(info->irq, info);
out7:
	bfin_t350mcqb_request_ports(0);
out6:
	fb_dealloc_cmap(&fbinfo->cmap);
out4:
	dma_free_coherent(NULL, fbinfo->fix.smem_len, info->fb_buffer,
			  info->dma_handle);
out3:
	framebuffer_release(fbinfo);
out2:
	free_dma(CH_PPI);
out1:
	platform_set_drvdata(pdev, NULL);

	return ret;
}

static int bfin_t350mcqb_remove(struct platform_device *pdev)
{

	struct fb_info *fbinfo = platform_get_drvdata(pdev);
	struct bfin_t350mcqbfb_info *info = fbinfo->par;

	unregister_framebuffer(fbinfo);

	free_dma(CH_PPI);
	free_irq(info->irq, info);

	if (info->fb_buffer != NULL)
		dma_free_coherent(NULL, fbinfo->fix.smem_len, info->fb_buffer,
				  info->dma_handle);

	fb_dealloc_cmap(&fbinfo->cmap);

#ifndef NO_BL_SUPPORT
	lcd_device_unregister(lcd_dev);
	backlight_device_unregister(bl_dev);
#endif

	bfin_t350mcqb_request_ports(0);

	platform_set_drvdata(pdev, NULL);
	framebuffer_release(fbinfo);

	printk(KERN_INFO DRIVER_NAME ": Unregister LCD driver.\n");

	return 0;
}

#ifdef CONFIG_PM
static int bfin_t350mcqb_suspend(struct platform_device *pdev, pm_message_t state)
{
	struct fb_info *fbinfo = platform_get_drvdata(pdev);
	struct bfin_t350mcqbfb_info *info = fbinfo->par;

	bfin_t350mcqb_disable_ppi();
	disable_dma(CH_PPI);
	bfin_write_PPI_STATUS(0xFFFF);

	return 0;
}

static int bfin_t350mcqb_resume(struct platform_device *pdev)
{
	struct fb_info *fbinfo = platform_get_drvdata(pdev);
	struct bfin_t350mcqbfb_info *info = fbinfo->par;

	enable_dma(CH_PPI);
	bfin_t350mcqb_enable_ppi();

	return 0;
}
#else
#define bfin_t350mcqb_suspend	NULL
#define bfin_t350mcqb_resume	NULL
#endif

static struct platform_driver bfin_t350mcqb_driver = {
	.probe = bfin_t350mcqb_probe,
	.remove = bfin_t350mcqb_remove,
	.suspend = bfin_t350mcqb_suspend,
	.resume = bfin_t350mcqb_resume,
	.driver = {
		   .name = DRIVER_NAME,
		   .owner = THIS_MODULE,
		   },
};

static int __devinit bfin_t350mcqb_driver_init(void)
{
	return platform_driver_register(&bfin_t350mcqb_driver);
}

static void __exit bfin_t350mcqb_driver_cleanup(void)
{
	platform_driver_unregister(&bfin_t350mcqb_driver);
}

MODULE_DESCRIPTION("Blackfin TFT LCD Driver");
MODULE_LICENSE("GPL");

module_init(bfin_t350mcqb_driver_init);
module_exit(bfin_t350mcqb_driver_cleanup);