path: root/drivers/video/metronomefb.c

/*
 * linux/drivers/video/metronomefb.c -- FB driver for Metronome controller
 *
 * Copyright (C) 2008, Jaya Kumar
 *
 * 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.
 *
 * Layout is based on skeletonfb.c by James Simmons and Geert Uytterhoeven.
 *
 * This work was made possible by help and equipment support from E-Ink
 * Corporation. http://support.eink.com/community
 *
 * This driver is written to be used with the Metronome display controller.
 * It was tested with an E-Ink 800x600 Vizplex EPD on a Gumstix Connex board
 * using the Lyre interface board.
 *
 * General notes:
 * - User must set metronomefb_enable=1 to enable it.
 * - See Documentation/fb/metronomefb.txt for how metronome works.
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/list.h>
#include <linux/firmware.h>
#include <linux/dma-mapping.h>
#include <linux/uaccess.h>
#include <linux/irq.h>

#include <asm/arch/pxa-regs.h>
#include <asm/unaligned.h>

#define DEBUG 1
#ifdef DEBUG
#define DPRINTK(f, a...) printk(KERN_DEBUG "%s: " f, __func__ , ## a)
#else
#define DPRINTK(f, a...)
#endif


/* Display specific information */
#define DPY_W 832
#define DPY_H 622

struct metromem_desc {
	u32 mFDADR0;
	u32 mFSADR0;
	u32 mFIDR0;
	u32 mLDCMD0;
};

struct metromem_cmd {
	u16 opcode;
	u16 args[((64-2)/2)];
	u16 csum;
};

struct metronomefb_par {
	unsigned char *metromem;
	struct metromem_desc *metromem_desc;
	struct metromem_cmd *metromem_cmd;
	unsigned char *metromem_wfm;
	unsigned char *metromem_img;
	u16 *metromem_img_csum;
	u16 *csum_table;
	int metromemsize;
	dma_addr_t metromem_dma;
	dma_addr_t metromem_desc_dma;
	struct fb_info *info;
	wait_queue_head_t waitq;
	u8 frame_count;
};

/* frame differs from image. frame includes non-visible pixels */
struct epd_frame {
	int fw; /* frame width */
	int fh; /* frame height */
};

static struct epd_frame epd_frame_table[] = {
	{
	.fw = 832,
	.fh = 622
	},
};

static struct fb_fix_screeninfo metronomefb_fix __devinitdata = {
	.id =		"metronomefb",
	.type =		FB_TYPE_PACKED_PIXELS,
	.visual =	FB_VISUAL_STATIC_PSEUDOCOLOR,
	.xpanstep =	0,
	.ypanstep =	0,
	.ywrapstep =	0,
	.line_length =	DPY_W,
	.accel =	FB_ACCEL_NONE,
};

static struct fb_var_screeninfo metronomefb_var __devinitdata = {
	.xres		= DPY_W,
	.yres		= DPY_H,
	.xres_virtual	= DPY_W,
	.yres_virtual	= DPY_H,
	.bits_per_pixel	= 8,
	.grayscale	= 1,
	.nonstd		= 1,
	.red =		{ 4, 3, 0 },
	.green =	{ 0, 0, 0 },
	.blue =		{ 0, 0, 0 },
	.transp =	{ 0, 0, 0 },
};

static unsigned int metronomefb_enable;

struct waveform_hdr {
	u8 stuff[32];

	u8 wmta[3];
	u8 fvsn;

	u8 luts;
	u8 mc;
	u8 trc;
	u8 stuff3;

	u8 endb;
	u8 swtb;
	u8 stuff2a[2];

	u8 stuff2b[3];
	u8 wfm_cs;
} __attribute__ ((packed));

/* main metronomefb functions */
static u8 calc_cksum(int start, int end, u8 *mem)
{
	u8 tmp = 0;
	int i;

	for (i = start; i < end; i++)
		tmp += mem[i];

	return tmp;
}

static u16 calc_img_cksum(u16 *start, int length)
{
	u16 tmp = 0;

	while (length--)
		tmp += *start++;

	return tmp;
}

/* here we decode the incoming waveform file and populate metromem */
#define EXP_WFORM_SIZE 47001
static int load_waveform(u8 *mem, size_t size, u8 *metromem, int m, int t,
				u8 *frame_count)
{
	int tta;
	int wmta;
	int trn = 0;
	int i;
	unsigned char v;
	u8 cksum;
	int cksum_idx;
	int wfm_idx, owfm_idx;
	int mem_idx = 0;
	struct waveform_hdr *wfm_hdr;

	if (size != EXP_WFORM_SIZE) {
		printk(