From cde79864061c8163e76709c8e002899035db5af7 Mon Sep 17 00:00:00 2001
From: lars <lars@3c298f89-4303-0410-b956-a3cf2f4a3e73>
Date: Fri, 5 Mar 2010 04:21:41 +0000
Subject: [xburst] Add support for the n516

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@19987 3c298f89-4303-0410-b956-a3cf2f4a3e73
---
 .../files-2.6.32/drivers/video/metronomefb.c       | 1229 ++++++++++++++++++++
 1 file changed, 1229 insertions(+)
 create mode 100644 target/linux/xburst/files-2.6.32/drivers/video/metronomefb.c

(limited to 'target/linux/xburst/files-2.6.32/drivers/video')

diff --git a/target/linux/xburst/files-2.6.32/drivers/video/metronomefb.c b/target/linux/xburst/files-2.6.32/drivers/video/metronomefb.c
new file mode 100644
index 0000000000..0d6a1cf4d9
--- /dev/null
+++ b/target/linux/xburst/files-2.6.32/drivers/video/metronomefb.c
@@ -0,0 +1,1229 @@
+/*
+ * 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 is intended to be architecture independent. A board specific driver
+ * must be used to perform all the physical IO interactions. An example
+ * is provided as am200epd.c
+ *
+ */
+
+#define DEBUG
+
+#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 <linux/ctype.h>
+
+#include <video/metronomefb.h>
+
+#include <asm/unaligned.h>
+
+/* Display specific information */
+#define DPY_W 832
+#define DPY_H 622
+
+#define WF_MODE_INIT	0 /* Initialization */
+#define WF_MODE_MU	1 /* Monochrome update */
+#define WF_MODE_GU	2 /* Grayscale update */
+#define WF_MODE_GC	3 /* Grayscale clearing */
+
+static int temp = 25;
+
+/* frame differs from image. frame includes non-visible pixels */
+struct epd_frame {
+	int fw; /* frame width */
+	int fh; /* frame height */
+	u16 config[4];
+	int wfm_size;
+};
+
+static struct epd_frame epd_frame_table[] = {
+	{
+		.fw = 832,
+		.fh = 622,
+		.config = {
+			15 /* sdlew */
+			| 2 << 8 /* sdosz */
+			| 0 << 11 /* sdor */
+			| 0 << 12 /* sdces */
+			| 0 << 15, /* sdcer */
+			42 /* gdspl */
+			| 1 << 8 /* gdr1 */
+			| 1 << 9 /* sdshr */
+			| 0 << 15, /* gdspp */
+			18 /* gdspw */
+			| 0 << 15, /* dispc */
+			599 /* vdlc */
+			| 0 << 11 /* dsi */
+			| 0 << 12, /* dsic */
+		},
+		.wfm_size = 47001,
+	},
+	{
+		.fw = 1088,
+		.fh = 791,
+		.config = {
+			0x0104,
+			0x031f,
+			0x0088,
+			0x02ff,
+		},
+		.wfm_size = 46770,
+	},
+	{
+		.fw = 1200,
+		.fh = 842,
+		.config = {
+			0x0101,
+			0x030e,
+			0x0012,
+			0x0280,
+		},
+		.wfm_size = 46770,
+	},
+	{
+		.fw = 800,
+		.fh = 600,
+		.config = {
+			15 /* sdlew */
+			| 2 << 8 /* sdosz */
+			| 0 << 11 /* sdor */
+			| 0 << 12 /* sdces */
+			| 0 << 15, /* sdcer */
+			42 /* gdspl */
+			| 1 << 8 /* gdr1 */
+			| 1 << 9 /* sdshr */
+			| 0 << 15, /* gdspp */
+			18 /* gdspw */
+			| 0 << 15, /* dispc */
+			599 /* vdlc */
+			| 0 << 11 /* dsi */
+			| 0 << 12, /* dsic */
+		},
+		.wfm_size = 46901,
+	},
+};
+
+static const 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 const 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 },
+};
+
+/* the waveform structure that is coming from userspace firmware */
+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 */
+static int load_waveform(u8 *mem, size_t size, int m, int t,
+				struct metronomefb_par *par)
+{
+	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;
+	u8 *metromem = par->metromem_wfm;
+	struct device *dev = &par->pdev->dev;
+	u8 mc, trc;
+	u16 *p;
+	u16 img_cksum;
+
+	dev_dbg(dev, "Loading waveforms, mode %d, temperature %d\n", m, t);
+
+	wfm_hdr = (struct waveform_hdr *) mem;
+
+	if (wfm_hdr->fvsn != 1) {
+		dev_err(dev, "Error: bad fvsn %x\n", wfm_hdr->fvsn);
+		return -EINVAL;
+	}
+	if (wfm_hdr->luts != 0) {
+		dev_err(dev, "Error: bad luts %x\n", wfm_hdr->luts);
+		return -EINVAL;
+	}
+	cksum = calc_cksum(32, 47, mem);
+	if (cksum != wfm_hdr->wfm_cs) {
+		dev_err(dev, "Error: bad cksum %x != %x\n", cksum,
+					wfm_hdr->wfm_cs);
+		return -EINVAL;
+	}
+	mc = wfm_hdr->mc + 1;
+	trc = wfm_hdr->trc + 1;
+
+	for (i = 0; i < 5; i++) {
+		if (*(wfm_hdr->stuff2a + i) != 0) {
+			dev_err(dev, "Error: unexpected value in padding\n");
+			return -EINVAL;
+		}
+	}
+
+	/* calculating trn. trn is something used to index into
+	the waveform. presumably selecting the right one for the
+	desired temperature. it works out the offset of the first
+	v that exceeds the specified temperature */
+	if ((sizeof(*wfm_hdr) + trc) > size)
+		return -EINVAL;
+
+	for (i = sizeof(*wfm_hdr); i <= sizeof(*wfm_hdr) + trc; i++) {
+		if (mem[i] > t) {
+			trn = i - sizeof(*wfm_hdr) - 1;
+			break;
+		}
+	}
+
+	/* check temperature range table checksum */
+	cksum_idx = sizeof(*wfm_hdr) + trc + 1;
+	if (cksum_idx > size)
+		return -EINVAL;
+	cksum = calc_cksum(sizeof(*wfm_hdr), cksum_idx, mem);
+	if (cksum != mem[cksum_idx]) {
+		dev_err(dev, "Error: bad temperature range table cksum"
+				" %x != %x\n", cksum, mem[cksum_idx]);
+		return -EINVAL;
+	}
+
+	/* check waveform mode table address checksum */
+	wmta = get_unaligned_le32(wfm_hdr->wmta) & 0x00FFFFFF;
+	cksum_idx = wmta + m*4 + 3;
+	if (cksum_idx > size)
+		return -EINVAL;
+	cksum = calc_cksum(cksum_idx - 3, cksum_idx, mem);
+	if (cksum != mem[cksum_idx]) {
+		dev_err(dev, "Error: bad mode table address cksum"
+				" %x != %x\n", cksum, mem[cksum_idx]);
+		return -EINVAL;
+	}
+
+	/* check waveform temperature table address checksum */
+	tta = get_unaligned_le32(mem + wmta + m * 4) & 0x00FFFFFF;
+	cksum_idx = tta + trn*4 + 3;
+	if (cksum_idx > size)
+		return -EINVAL;
+	cksum = calc_cksum(cksum_idx - 3, cksum_idx, mem);
+	if (cksum != mem[cksum_idx]) {
+		dev_err(dev, "Error: bad temperature table address cksum"
+			" %x != %x\n", cksum, mem[cksum_idx]);
+		return -EINVAL;
+	}
+
+	/* here we do the real work of putting the waveform into the
+	metromem buffer. this does runlength decoding of the waveform */
+	wfm_idx = get_unaligned_le32(mem + tta + trn * 4) & 0x00FFFFFF;
+	owfm_idx = wfm_idx;
+	if (wfm_idx > size)
+		return -EINVAL;
+	while (wfm_idx < size) {
+		unsigned char rl;
+		v = mem[wfm_idx++];
+		if (v == wfm_hdr->swtb) {
+			while (((v = mem[wfm_idx++]) != wfm_hdr->swtb) &&
+				wfm_idx < size)
+				metromem[mem_idx++] = v;
+
+			continue;
+		}
+
+		if (v == wfm_hdr->endb)
+			break;
+
+		rl = mem[wfm_idx++];
+		for (i = 0; i <= rl; i++)
+			metromem[mem_idx++] = v;
+	}
+
+	cksum_idx = wfm_idx;
+	if (cksum_idx > size)
+		return -EINVAL;
+	dev_dbg(dev, "mem_idx = %u\n", mem_idx);
+	cksum = calc_cksum(owfm_idx, cksum_idx, mem);
+	if (cksum != mem[cksum_idx]) {
+		dev_err(dev, "Error: bad waveform data cksum"
+				" %x != %x\n", cksum, mem[cksum_idx]);
+		return -EINVAL;
+	}
+	par->frame_count = (mem_idx/64);
+
+	p = (u16 *)par->metromem_wfm;
+	img_cksum = calc_img_cksum(p, 16384 / 2);
+	p[16384 / 2] = __cpu_to_le16(img_cksum);
+
+	par->current_wf_mode = m;
+	par->current_wf_temp = t;
+
+	return 0;
+}
+
+static int check_err(struct metronomefb_par *par)
+{
+	int res;
+
+	res = par->board->get_err(par);
+	dev_dbg(&par->pdev->dev, "ERR = %d\n", res);
+	return res;
+}
+
+static inline int wait_for_rdy(struct metronomefb_par *par)
+{
+	int res = 0;
+
+	if (!par->board->get_rdy(par))
+		res = par->board->met_wait_event_intr(par);
+
+	return res;
+}
+
+static int metronome_display_cmd(struct metronomefb_par *par)
+{
+	int i;
+	u16 cs;
+	u16 opcode;
+	static u8 borderval;
+	int res;
+
+	res = wait_for_rdy(par);
+	if (res)
+		return res;
+
+	dev_dbg(&par->pdev->dev, "%s: ENTER\n", __func__);
+	/* setup display command
+	we can't immediately set the opcode since the controller
+	will try parse the command before we've set it all up
+	so we just set cs here and set the opcode at the end */
+
+	if (par->metromem_cmd->opcode == 0xCC40)
+		opcode = cs = 0xCC41;
+	else
+		opcode = cs = 0xCC40;
+
+	/* set the args ( 2 bytes ) for display */
+	i = 0;
+	par->metromem_cmd->args[i] = 	0 << 3 /* border update */
+					| (3 << 4)
+//					| ((borderval++ % 4) & 0x0F) << 4
+					| (par->frame_count - 1) << 8;
+	cs += par->metromem_cmd->args[i++];
+
+	/* the rest are 0 */
+	memset((u8 *) (par->metromem_cmd->args + i), 0, (32-i)*2);
+
+	par->metromem_cmd->csum = cs;
+	par->metromem_cmd->opcode = opcode; /* display cmd */
+
+	return 0;
+
+}
+
+static int __devinit metronome_powerup_cmd(struct metronomefb_par *par)
+{
+	int i;
+	u16 cs;
+	int res;
+
+	dev_dbg(&par->pdev->dev, "%s: ENTER\n", __func__);
+	/* setup power up command */
+	par->metromem_cmd->opcode = 0x1234; /* pwr up pseudo cmd */
+	cs = par->metromem_cmd->opcode;
+
+	/* set pwr1,2,3 to 1024 */
+	for (i = 0; i < 3; i++) {
+//		par->metromem_cmd->args[i] = 1024;
+		par->metromem_cmd->args[i] = 100;
+		cs += par->metromem_cmd->args[i];
+	}
+
+	/* the rest are 0 */
+	memset((u8 *) (par->metromem_cmd->args + i), 0, (32-i)*2);
+
+	par->metromem_cmd->csum = cs;
+
+	msleep(1);
+	par->board->set_rst(par, 1);
+
+	msleep(1);
+	par->board->set_stdby(par, 1);
+
+	res = par->board->met_wait_event(par);
+	dev_dbg(&par->pdev->dev, "%s: EXIT: %d\n", __func__, res);
+	return res;
+}
+
+static int __devinit metronome_config_cmd(struct metronomefb_par *par)
+{
+	/* setup config command
+	we can't immediately set the opcode since the controller
+	will try parse the command before we've set it all up */
+
+	dev_dbg(&par->pdev->dev, "%s: ENTER\n", __func__);
+	memcpy(par->metromem_cmd->args, epd_frame_table[par->dt].config,
+		sizeof(epd_frame_table[par->dt].config));
+	/* the rest are 0 */
+	memset((u8 *) (par->metromem_cmd->args + 4), 0, (32-4)*2);
+
+	par->metromem_cmd->csum = 0xCC10;
+	par->metromem_cmd->csum += calc_img_cksum(par->metromem_cmd->args, 4);
+	par->metromem_cmd->opcode = 0xCC10; /* config cmd */
+
+	return par->board->met_wait_event(par);
+}
+
+static int __devinit metronome_init_cmd(struct metronomefb_par *par)
+{
+	int i;
+	u16 cs;
+
+	/* setup init command
+	we can't immediately set the opcode since the controller
+	will try parse the command before we've set it all up
+	so we just set cs here and set the opcode at the end */
+
+	dev_dbg(&par->pdev->dev, "%s: ENTER\n", __func__);
+	cs = 0xCC20;
+
+	/* set the args ( 2 bytes ) for init */
+	i = 0;
+	par->metromem_cmd->args[i] = 0x0007;
+	cs += par->metromem_cmd->args[i++];
+
+	/* the rest are 0 */
+	memset((u8 *) (par->metromem_cmd->args + i), 0, (32-i)*2);
+
+	par->metromem_cmd->csum = cs;
+	par->metromem_cmd->opcode = 0xCC20; /* init cmd */
+
+	return par->board->met_wait_event(par);
+}
+
+static int metronome_bootup(struct metronomefb_par *par)
+{
+	int res;
+
+	res = metronome_powerup_cmd(par);
+	if (res) {
+		dev_err(&par->pdev->dev, "metronomefb: POWERUP cmd failed\n");
+		goto finish;
+	}
+
+	check_err(par);
+	res = metronome_config_cmd(par);
+	if (res) {
+		dev_err(&par->pdev->dev, "metronomefb: CONFIG cmd failed\n");
+		goto finish;
+	}
+	check_err(par);
+
+	res = metronome_init_cmd(par);
+	if (res)
+		dev_err(&par->pdev->dev, "metronomefb: INIT cmd failed\n");
+	check_err(par);
+
+finish:
+	return res;
+}
+
+static int __devinit metronome_init_regs(struct metronomefb_par *par)
+{
+	int res;
+
+	if (par->board->power_ctl)
+		par->board->power_ctl(par, METRONOME_POWER_ON);
+
+	res =  metronome_bootup(par);
+
+	return res;
+}
+
+static void metronomefb_dpy_update(struct metronomefb_par *par, int clear_all)
+{
+	int x, y;
+	int i;
+	u16 cksum = 0;
+	u32 *buf = (u32 __force *)par->info->screen_base;
+	u32 *img = (u32 *)(par->metromem_img);
+	u32 diff;
+	u32 tmp;
+	unsigned int fbsize = par->info->fix.smem_len;
+	int fx = par->info->fix.line_length;
+	int fy = fbsize / fx;
+	int fx_buf = fx / sizeof(*buf);
+	int m;
+	static int is_first_update = 1;
+	static int partial_updates_count = 0;
+	u32 *fxbuckets = par->fxbuckets;
+	u32 *fybuckets = par->fybuckets;
+
+	wait_for_rdy(par);
+
+	memset(fxbuckets, 0, fx_buf * sizeof(*fxbuckets));
+	memset(fybuckets, 0, fy * sizeof(*fybuckets));
+
+	i = 0;
+	for (y = 0; y < fy; y++) {
+		for(x = 0; x < fx_buf; x++, i++) {
+			tmp = (buf[i] << 5) & 0xE0E0E0E0;
+			img[i] &= 0xF0F0F0F0;
+			diff = img[i] ^ tmp;
+
+			fxbuckets[x] |= diff;
+			fybuckets[y] |= diff;
+
+			img[i] = (img[i] >> 4) | tmp;
+			cksum += img[i] & 0x0000ffff;
+			cksum += (img[i] >> 16);
+		}
+	}
+
+	*((u16 *)(par->metromem_img) + fbsize/2) = cksum;
+
+	if (clear_all || is_first_update ||
+		(partial_updates_count == par->partial_autorefresh_interval)) {
+		m = WF_MODE_GC;
+		partial_updates_count = 0;
+	} else {
+		int min_x = fx_buf;
+		int max_x = 0;
+		int min_y = fy;
+		int max_y = 0;
+		int change_count;
+
+		for (x = 0; x < fx_buf; x++)
+			if(fxbuckets[x]) {
+				min_x = x;
+				break;
+			}
+
+		for (x = fx_buf - 1; x >= 0; x--)
+			if(fxbuckets[x]) {
+				max_x = x;
+				break;
+			}
+
+		for (y = 0; y < fy; y++)
+			if(fybuckets[y]) {
+				min_y = y;
+				break;
+			}
+
+		for (y = fy - 1; y >= 0; y--)
+			if(fybuckets[y]) {
+				max_y = y;
+				break;
+			}
+
+		if ((min_x > max_x) || (min_y > max_y))
+			change_count = 0;
+		else
+			change_count = (max_x - min_x + 1) * (max_y - min_y + 1) * sizeof(*buf);
+
+		if (change_count < fbsize / 100 * par->manual_refresh_threshold)
+			m = WF_MODE_GU;
+		else
+			m = WF_MODE_GC;
+
+		dev_dbg(&par->pdev->dev, "min_x = %d, max_x = %d, min_y = %d, max_y = %d\n",
+				min_x, max_x, min_y, max_y);
+		dev_dbg(&par->pdev->dev, "change_count = %u, treshold = %u%% (%u pixels)\n",
+				change_count, par->manual_refresh_threshold,
+				fbsize / 100 * par->manual_refresh_threshold);
+
+		partial_updates_count++;
+	}
+
+	if (m != par->current_wf_mode) {
+		load_waveform((u8 *) par->firmware->data, par->firmware->size,
+				m, par->current_wf_temp, par);
+	}
+
+	for(;;) {
+		if (likely(!check_err(par))) {
+			metronome_display_cmd(par);
+			break;
+		}
+
+		par->board->set_stdby(par, 0);
+		printk("Resetting Metronome\n");
+		par->board->set_rst(par, 0);
+		mdelay(1);
+		if (par->board->power_ctl)
+			par->board->power_ctl(par, METRONOME_POWER_OFF);
+
+		mdelay(1);
+		load_waveform((u8 *) par->firmware->data, par->firmware->size,
+				WF_MODE_GC, par->current_wf_temp, par);
+		if (par->board->power_ctl)
+			par->board->power_ctl(par, METRONOME_POWER_ON);
+		metronome_bootup(par);
+	}
+
+	is_first_update = 0;
+}
+
+/* this is called back from the deferred io workqueue */
+static void metronomefb_dpy_deferred_io(struct fb_info *info,
+				struct list_head *pagelist)
+{
+	struct metronomefb_par *par = info->par;
+
+	/* We will update entire display because we need to change
+	 * 'previous image' field in pixels which was changed at
+	 * previous refresh
+	 */
+	mutex_lock(&par->lock);
+	metronomefb_dpy_update(par, 0);
+	mutex_unlock(&par->lock);
+}
+
+static void metronomefb_fillrect(struct fb_info *info,
+				   const struct fb_fillrect *rect)
+{
+	struct metronomefb_par *par = info->par;
+
+	mutex_lock(&par->lock);
+	sys_fillrect(info, rect);
+	metronomefb_dpy_update(par, 0);
+	mutex_unlock(&par->lock);
+}
+
+static void metronomefb_copyarea(struct fb_info *info,
+				   const struct fb_copyarea *area)
+{
+	struct metronomefb_par *par = info->par;
+
+	mutex_lock(&par->lock);
+	sys_copyarea(info, area);
+	metronomefb_dpy_update(par, 0);
+	mutex_unlock(&par->lock);
+}
+
+static void metronomefb_imageblit(struct fb_info *info,
+				const struct fb_image *image)
+{
+	struct metronomefb_par *par = info->par;
+
+	mutex_lock(&par->lock);
+	sys_imageblit(info, image);
+	metronomefb_dpy_update(par, 0);
+	mutex_unlock(&par->lock);
+}
+
+/*
+ * this is the slow path from userspace. they can seek and write to
+ * the fb. it is based on fb_sys_write
+ */
+static ssize_t metronomefb_write(struct fb_info *info, const char __user *buf,
+				size_t count, loff_t *ppos)
+{
+	struct metronomefb_par *par = info->par;
+	unsigned long p = *ppos;
+	void *dst;
+	int err = 0;
+	unsigned long total_size;
+
+	if (info->state != FBINFO_STATE_RUNNING)
+		return -EPERM;
+
+	total_size = info->fix.smem_len;
+
+	if (p > total_size)
+		return -EFBIG;
+
+	if (count > total_size) {
+		err = -EFBIG;
+		count = total_size;
+	}
+
+	if (count + p > total_size) {
+		if (!err)
+			err = -ENOSPC;
+
+		count = total_size - p;
+	}
+
+	dst = (void __force *)(info->screen_base + p);
+
+	mutex_lock(&par->lock);
+
+	if (copy_from_user(dst, buf, count))
+		err = -EFAULT;
+
+	if  (!err)
+		*ppos += count;
+
+	metronomefb_dpy_update(par, 0);
+	mutex_unlock(&par->lock);
+
+	return (err) ? err : count;
+}
+
+static struct fb_ops metronomefb_ops = {
+	.owner		= THIS_MODULE,
+	.fb_write	= metronomefb_write,
+	.fb_fillrect	= metronomefb_fillrect,
+	.fb_copyarea	= metronomefb_copyarea,
+	.fb_imageblit	= metronomefb_imageblit,
+};
+
+static struct fb_deferred_io metronomefb_defio = {
+	.delay		= HZ / 4,
+	.deferred_io	= metronomefb_dpy_deferred_io,
+};
+
+static ssize_t metronomefb_defio_delay_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct fb_info *info = dev_get_drvdata(dev);
+
+	sprintf(buf, "%lu\n", info->fbdefio->delay * 1000 / HZ);
+	return strlen(buf) + 1;
+}
+
+static ssize_t metronomefb_defio_delay_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	struct fb_info *info = dev_get_drvdata(dev);
+	char *after;
+	unsigned long state = simple_strtoul(buf, &after, 10);
+	size_t count = after - buf;
+	ssize_t ret = -EINVAL;
+
+	if (*after && isspace(*after))
+		count++;
+
+	state = state * HZ / 1000;
+
+	if (!state)
+		state = 1;
+
+	if (count == size) {
+		ret = count;
+		info->fbdefio->delay = state;
+	}
+
+	return ret;
+}
+
+static ssize_t metronomefb_manual_refresh_thr_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct fb_info *info = dev_get_drvdata(dev);
+	struct metronomefb_par *par = info->par;
+
+	return sprintf(buf, "%u\n", par->manual_refresh_threshold);
+}
+
+static ssize_t metronomefb_manual_refresh_thr_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	struct fb_info *info = dev_get_drvdata(dev);
+	struct metronomefb_par *par = info->par;
+	char *after;
+	unsigned long val = simple_strtoul(buf, &after, 10);
+	size_t count = after - buf;
+	ssize_t ret = -EINVAL;
+
+	if (*after && isspace(*after))
+		count++;
+
+	if (val > 100)
+		return -EINVAL;
+
+
+	if (count == size) {
+		ret = count;
+		par->manual_refresh_threshold = val;
+	}
+
+	return ret;
+}
+
+static ssize_t metronomefb_autorefresh_interval_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct fb_info *info = dev_get_drvdata(dev);
+	struct metronomefb_par *par = info->par;
+
+	return sprintf(buf, "%u\n", par->partial_autorefresh_interval);
+}
+
+static ssize_t metronomefb_autorefresh_interval_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	struct fb_info *info = dev_get_drvdata(dev);
+	struct metronomefb_par *par = info->par;
+	char *after;
+	unsigned long val = simple_strtoul(buf, &after, 10);
+	size_t count = after - buf;
+	ssize_t ret = -EINVAL;
+
+	if (*after && isspace(*after))
+		count++;
+
+	if (val > 100)
+		return -EINVAL;
+
+
+	if (count == size) {
+		ret = count;
+		par->partial_autorefresh_interval = val;
+	}
+
+	return ret;
+}
+
+static ssize_t metronomefb_temp_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct fb_info *info = dev_get_drvdata(dev);
+	struct metronomefb_par *par = info->par;
+
+	return sprintf(buf, "%u\n", par->current_wf_temp);
+}
+
+static ssize_t metronomefb_temp_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	struct fb_info *info = dev_get_drvdata(dev);
+	struct metronomefb_par *par = info->par;
+	char *after;
+	unsigned long val = simple_strtoul(buf, &after, 10);
+	size_t count = after - buf;
+	ssize_t ret = -EINVAL;
+
+	if (*after && isspace(*after))
+		count++;
+
+	if (val > 100)
+		return -EINVAL;
+
+
+	if (count == size) {
+		ret = count;
+		if (val != par->current_wf_temp)
+			load_waveform((u8 *) par->firmware->data, par->firmware->size,
+					par->current_wf_mode, val, par);
+	}
+
+	return ret;
+}
+
+DEVICE_ATTR(defio_delay, 0644,
+		metronomefb_defio_delay_show, metronomefb_defio_delay_store);
+DEVICE_ATTR(manual_refresh_threshold, 0644,
+		metronomefb_manual_refresh_thr_show, metronomefb_manual_refresh_thr_store);
+DEVICE_ATTR(temp, 0644,
+		metronomefb_temp_show, metronomefb_temp_store);
+DEVICE_ATTR(autorefresh_interval, 0644,
+		metronomefb_autorefresh_interval_show, metronomefb_autorefresh_interval_store);
+
+
+static int __devinit metronomefb_probe(struct platform_device *dev)
+{
+	struct fb_info *info;
+	struct metronome_board *board;
+	int retval = -ENOMEM;
+	int videomemorysize;
+	unsigned char *videomemory;
+	struct metronomefb_par *par;
+	const struct firmware *fw_entry;
+	int i;
+	int panel_type;
+	int fw, fh;
+	int epd_dt_index;
+
+	/* pick up board specific routines */
+	board = dev->dev.platform_data;
+	if (!board)
+		return -EINVAL;
+
+	/* try to count device specific driver, if can't, platform recalls */
+	if (!try_module_get(board->owner))
+		return -ENODEV;
+
+	info = framebuffer_alloc(sizeof(struct metronomefb_par), &dev->dev);
+	if (!info)
+		goto err;
+
+	/* we have two blocks of memory.
+	info->screen_base which is vm, and is the fb used by apps.
+	par->metromem which is physically contiguous memory and
+	contains the display controller commands, waveform,
+	processed image data and padding. this is the data pulled
+	by the device's LCD controller and pushed to Metronome.
+	the metromem memory is allocated by the board driver and
+	is provided to us */
+
+	panel_type = board->get_panel_type();
+	switch (panel_type) {
+	case 5:
+		epd_dt_index = 3;
+		break;
+	case 6:
+		epd_dt_index = 0;
+		break;
+	case 8:
+		epd_dt_index = 1;
+		break;
+	case 97:
+		epd_dt_index = 2;
+		break;
+	default:
+		dev_err(&dev->dev, "Unexpected panel type. Defaulting to 6\n");
+		epd_dt_index = 0;
+		break;
+	}
+
+	fw = epd_frame_table[epd_dt_index].fw;
+	fh = epd_frame_table[epd_dt_index].fh;
+
+	/* we need to add a spare page because our csum caching scheme walks
+	 * to the end of the page */
+	videomemorysize = PAGE_SIZE + (fw * fh);
+	videomemory = vmalloc(videomemorysize);
+	if (!videomemory)
+		goto err_fb_rel;
+
+	memset(videomemory, 0xff, videomemorysize);
+
+	info->screen_base = (char __force __iomem *)videomemory;
+	info->fbops = &metronomefb_ops;
+
+	info->var = metronomefb_var;
+	info->var.xres = fw;
+	info->var.yres = fh;
+	info->var.xres_virtual = fw;
+	info->var.yres_virtual = fh;
+
+	info->fix = metronomefb_fix;
+	info->fix.smem_len = fw * fh; /* Real size of image area */
+	info->fix.line_length = fw;
+
+	par = info->par;
+	par->info = info;
+	par->board = board;
+	par->dt = epd_dt_index;
+	par->pdev = dev;
+
+	par->fxbuckets = kmalloc((fw / 4 + 1) * sizeof(*par->fxbuckets), GFP_KERNEL);
+	if (!par->fxbuckets)
+		goto err_vfree;
+
+	par->fybuckets = kmalloc(fh * sizeof(*par->fybuckets), GFP_KERNEL);
+	if (!par->fybuckets)
+		goto err_fxbuckets;
+
+	init_waitqueue_head(&par->waitq);
+	par->manual_refresh_threshold = 60;
+	par->partial_autorefresh_interval = 256;
+	mutex_init(&par->lock);
+
+	/* this table caches per page csum values. */
+	par->csum_table = vmalloc(videomemorysize/PAGE_SIZE);
+	if (!par->csum_table)
+		goto err_fybuckets;
+
+	/* the physical framebuffer that we use is setup by
+	 * the platform device driver. It will provide us
+	 * with cmd, wfm and image memory in a contiguous area. */
+	retval = board->setup_fb(par);
+	if (retval) {
+		dev_err(&dev->dev, "Failed to setup fb\n");
+		goto err_csum_table;
+	}
+
+	/* after this point we should have a framebuffer */
+	if ((!par->metromem_wfm) ||  (!par->metromem_img) ||
+		(!par->metromem_dma)) {
+		dev_err(&dev->dev, "fb access failure\n");
+		retval = -EINVAL;
+		goto err_csum_table;
+	}
+
+	info->fix.smem_start = 0;
+
+	/* load the waveform in. assume mode 3, temp 31 for now
+		a) request the waveform file from userspace
+		b) process waveform and decode into metromem */
+	retval = request_firmware(&fw_entry, "metronome.wbf", &dev->dev);
+	if (retval < 0) {
+		dev_err(&dev->dev, "Failed to get waveform\n");
+		goto err_csum_table;
+	}
+
+	retval = load_waveform((u8 *) fw_entry->data, fw_entry->size, WF_MODE_GC, temp,
+				par);
+	if (retval < 0) {
+		dev_err(&dev->dev, "Failed processing waveform\n");
+		goto err_csum_table;
+	}
+	par->firmware = fw_entry;
+
+	retval = board->setup_io(par);
+	if (retval) {
+		dev_err(&dev->dev, "metronomefb: setup_io() failed\n");
+		goto err_csum_table;
+	}
+
+	if (board->setup_irq(info))
+		goto err_csum_table;
+
+	retval = metronome_init_regs(par);
+	if (retval < 0)
+		goto err_free_irq;
+
+	info->flags = FBINFO_FLAG_DEFAULT;
+
+	info->fbdefio = &metronomefb_defio;
+	fb_deferred_io_init(info);
+
+	retval = fb_alloc_cmap(&info->cmap, 8, 0);
+	if (retval < 0) {
+		dev_err(&dev->dev, "Failed to allocate colormap\n");
+		goto err_free_irq;
+	}
+
+	/* set cmap */
+	for (i = 0; i < 8; i++)
+		info->cmap.red[i] = ((2 * i + 1)*(0xFFFF))/16;
+	memcpy(info->cmap.green, info->cmap.red, sizeof(u16)*8);
+	memcpy(info->cmap.blue, info->cmap.red, sizeof(u16)*8);
+
+	retval = register_framebuffer(info);
+	if (retval < 0)
+		goto err_cmap;
+
+	platform_set_drvdata(dev, info);
+
+	retval = device_create_file(info->dev, &dev_attr_defio_delay);
+	if (retval)
+		goto err_devattr_defio_delay;
+
+	retval = device_create_file(info->dev, &dev_attr_manual_refresh_threshold);
+	if (retval)
+		goto err_devattr_manual_refresh_thr;
+
+	retval = device_create_file(info->dev, &dev_attr_temp);
+	if (retval)
+		goto err_devattr_temp;
+
+	retval = device_create_file(info->dev, &dev_attr_autorefresh_interval);
+	if (retval)
+		goto err_devattr_autorefresh;
+
+	dev_info(&dev->dev,
+		"fb%d: Metronome frame buffer device, using %dK of video"
+		" memory\n", info->node, videomemorysize >> 10);
+
+	return 0;
+
+	device_remove_file(info->dev, &dev_attr_autorefresh_interval);
+err_devattr_autorefresh:
+	device_remove_file(info->dev, &dev_attr_temp);
+err_devattr_temp:
+	device_remove_file(info->dev, &dev_attr_manual_refresh_threshold);
+err_devattr_manual_refresh_thr:
+	device_remove_file(info->dev, &dev_attr_defio_delay);
+err_devattr_defio_delay:
+	unregister_framebuffer(info);
+err_cmap:
+	fb_dealloc_cmap(&info->cmap);
+err_free_irq:
+	board->cleanup(par);
+err_csum_table:
+	vfree(par->csum_table);
+err_fybuckets:
+	kfree(par->fybuckets);
+err_fxbuckets:
+	kfree(par->fxbuckets);
+err_vfree:
+	vfree(videomemory);
+err_fb_rel:
+	framebuffer_release(info);
+err:
+	module_put(board->owner);
+	return retval;
+}
+
+static int __devexit metronomefb_remove(struct platform_device *dev)
+{
+	struct fb_info *info = platform_get_drvdata(dev);
+
+	if (info) {
+		struct metronomefb_par *par = info->par;
+
+		par->board->set_stdby(par, 0);
+		mdelay(1);
+		if (par->board->power_ctl)
+			par->board->power_ctl(par, METRONOME_POWER_OFF);
+
+		device_remove_file(info->dev, &dev_attr_autorefresh_interval);
+		device_remove_file(info->dev, &dev_attr_temp);
+		device_remove_file(info->dev, &dev_attr_manual_refresh_threshold);
+		device_remove_file(info->dev, &dev_attr_defio_delay);
+		unregister_framebuffer(info);
+		fb_deferred_io_cleanup(info);
+		fb_dealloc_cmap(&info->cmap);
+		par->board->cleanup(par);
+		vfree(par->csum_table);
+		kfree(par->fybuckets);
+		kfree(par->fxbuckets);
+		vfree((void __force *)info->screen_base);
+		module_put(par->board->owner);
+		release_firmware(par->firmware);
+		dev_dbg(&dev->dev, "calling release\n");
+		framebuffer_release(info);
+	}
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int metronomefb_suspend(struct platform_device *pdev, pm_message_t message)
+{
+	struct fb_info *info = platform_get_drvdata(pdev);
+	struct metronomefb_par *par = info->par;
+
+	par->board->set_stdby(par, 0);
+	par->board->set_rst(par, 0);
+	if (par->board->power_ctl)
+		par->board->power_ctl(par, METRONOME_POWER_OFF);
+
+	return 0;
+}
+
+static int metronomefb_resume(struct platform_device *pdev)
+{
+	struct fb_info *info = platform_get_drvdata(pdev);
+	struct metronomefb_par *par = info->par;
+
+	if (par->board->power_ctl)
+		par->board->power_ctl(par, METRONOME_POWER_ON);
+
+	mutex_lock(&par->lock);
+	metronome_bootup(par);
+	mutex_unlock(&par->lock);
+
+	return 0;
+}
+
+#else
+#define metronomefb_suspend NULL
+#define metronomefb_resume NULL
+#endif
+
+
+static struct platform_driver metronomefb_driver = {
+	.driver		= {
+			.owner	= THIS_MODULE,
+			.name	= "metronomefb",
+			},
+	.probe		= metronomefb_probe,
+	.remove		= __devexit_p(metronomefb_remove),
+	.suspend	= metronomefb_suspend,
+	.resume		= metronomefb_resume,
+};
+
+static int __init metronomefb_init(void)
+{
+	return platform_driver_register(&metronomefb_driver);
+}
+
+static void __exit metronomefb_exit(void)
+{
+	platform_driver_unregister(&metronomefb_driver);
+}
+
+module_param(temp, int, 0);
+MODULE_PARM_DESC(temp, "Set current temperature");
+
+module_init(metronomefb_init);
+module_exit(metronomefb_exit);
+
+MODULE_DESCRIPTION("fbdev driver for Metronome controller");
+MODULE_AUTHOR("Jaya Kumar");
+MODULE_LICENSE("GPL");
-- 
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