linux-imx

/***************************************************************************

 *   Copyright (C) 2010-2012 by Bruno Prémont <bonbons@linux-vserver.org>  *

 *                                                                         *

 *   Based on Logitech G13 driver (v0.4)                                   *

 *     Copyright (C) 2009 by Rick L. Vinyard, Jr. <rvinyard@cs.nmsu.edu>   *

 *                                                                         *

 *   This program is free software: you can redistribute it and/or modify  *

 *   it under the terms of the GNU General Public License as published by  *

 *   the Free Software Foundation, version 2 of the License.               *

 *                                                                         *

 *   This driver is distributed in the hope that it will be useful, but    *

 *   WITHOUT ANY WARRANTY; without even the implied warranty of            *

 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU      *

 *   General Public License for more details.                              *

 *                                                                         *

 *   You should have received a copy of the GNU General Public License     *

 *   along with this software. If not see <http://www.gnu.org/licenses/>.  *

 ***************************************************************************/

​

#include <linux/hid.h>

#include <linux/vmalloc.h>

​

#include <linux/fb.h>

#include <linux/module.h>

​

#include "hid-picolcd.h"

​

/* Framebuffer

 *

 * The PicoLCD use a Topway LCD module of 256x64 pixel

 * This display area is tiled over 4 controllers with 8 tiles

 * each. Each tile has 8x64 pixel, each data byte representing

 * a 1-bit wide vertical line of the tile.

 *

 * The display can be updated at a tile granularity.

 *

 *       Chip 1           Chip 2           Chip 3           Chip 4

 * +----------------+----------------+----------------+----------------+

 * |     Tile 1     |     Tile 1     |     Tile 1     |     Tile 1     |

 * +----------------+----------------+----------------+----------------+

 * |     Tile 2     |     Tile 2     |     Tile 2     |     Tile 2     |

 * +----------------+----------------+----------------+----------------+

 *                                  ...

 * +----------------+----------------+----------------+----------------+

 * |     Tile 8     |     Tile 8     |     Tile 8     |     Tile 8     |

 * +----------------+----------------+----------------+----------------+

 */

#define PICOLCDFB_NAME "picolcdfb"

#define PICOLCDFB_WIDTH (256)

#define PICOLCDFB_HEIGHT (64)

#define PICOLCDFB_SIZE (PICOLCDFB_WIDTH * PICOLCDFB_HEIGHT / 8)

​

#define PICOLCDFB_UPDATE_RATE_LIMIT   10

#define PICOLCDFB_UPDATE_RATE_DEFAULT  2

​

/* Framebuffer visual structures */

static const struct fb_fix_screeninfo picolcdfb_fix = {

    .id          = PICOLCDFB_NAME,

    .type        = FB_TYPE_PACKED_PIXELS,

    .visual      = FB_VISUAL_MONO01,

    .xpanstep    = 0,

    .ypanstep    = 0,

    .ywrapstep   = 0,