drivers/video/omap2/displays/panel-acx565akm.c - LeafOS-Devices/android_kernel_samsung_gta4xl - Gitiles

 /*
  * Support for ACX565AKM LCD Panel used on Nokia N900
  *
  * Copyright (C) 2010 Nokia Corporation
  *
  * Original Driver Author: Imre Deak <imre.deak@nokia.com>
  * Based on panel-generic.c by Tomi Valkeinen <tomi.valkeinen@nokia.com>
  * Adapted to new DSS2 framework: Roger Quadros <roger.quadros@nokia.com>
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 as published by
  * the Free Software Foundation.
  *
  * This program 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 program.  If not, see <http://www.gnu.org/licenses/>.
  */

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/delay.h>
 #include <linux/spi/spi.h>
 #include <linux/jiffies.h>
 #include <linux/sched.h>
 #include <linux/backlight.h>
 #include <linux/fb.h>

 #include <video/omapdss.h>

 #define MIPID_CMD_READ_DISP_ID		0x04
 #define MIPID_CMD_READ_RED		0x06
 #define MIPID_CMD_READ_GREEN		0x07
 #define MIPID_CMD_READ_BLUE		0x08
 #define MIPID_CMD_READ_DISP_STATUS	0x09
 #define MIPID_CMD_RDDSDR		0x0F
 #define MIPID_CMD_SLEEP_IN		0x10
 #define MIPID_CMD_SLEEP_OUT		0x11
 #define MIPID_CMD_DISP_OFF		0x28
 #define MIPID_CMD_DISP_ON		0x29
 #define MIPID_CMD_WRITE_DISP_BRIGHTNESS	0x51
 #define MIPID_CMD_READ_DISP_BRIGHTNESS	0x52
 #define MIPID_CMD_WRITE_CTRL_DISP	0x53

 #define CTRL_DISP_BRIGHTNESS_CTRL_ON	(1 << 5)
 #define CTRL_DISP_AMBIENT_LIGHT_CTRL_ON	(1 << 4)
 #define CTRL_DISP_BACKLIGHT_ON		(1 << 2)
 #define CTRL_DISP_AUTO_BRIGHTNESS_ON	(1 << 1)

 #define MIPID_CMD_READ_CTRL_DISP	0x54
 #define MIPID_CMD_WRITE_CABC		0x55
 #define MIPID_CMD_READ_CABC		0x56

 #define MIPID_VER_LPH8923		3
 #define MIPID_VER_LS041Y3		4
 #define MIPID_VER_L4F00311		8
 #define MIPID_VER_ACX565AKM		9

 struct acx565akm_device {
 	char		*name;
 	int		enabled;
 	int		model;
 	int		revision;
 	u8		display_id[3];
 	unsigned	has_bc:1;
 	unsigned	has_cabc:1;
 	unsigned	cabc_mode;
 	unsigned long	hw_guard_end;		/* next value of jiffies
 						   when we can issue the
 						   next sleep in/out command */
 	unsigned long	hw_guard_wait;		/* max guard time in jiffies */

 	struct spi_device	*spi;
 	struct mutex		mutex;

 	struct omap_dss_device	*dssdev;
 	struct backlight_device *bl_dev;
 };

 static struct acx565akm_device acx_dev;
 static int acx565akm_bl_update_status(struct backlight_device *dev);

 /*--------------------MIPID interface-----------------------------*/

 static void acx565akm_transfer(struct acx565akm_device *md, int cmd,
 			      const u8 *wbuf, int wlen, u8 *rbuf, int rlen)
 {
 	struct spi_message	m;
 	struct spi_transfer	*x, xfer[5];
 	int			r;

 	BUG_ON(md->spi == NULL);

 	spi_message_init(&m);

 	memset(xfer, 0, sizeof(xfer));
 	x = &xfer[0];

 	cmd &=  0xff;
 	x->tx_buf = &cmd;
 	x->bits_per_word = 9;
 	x->len = 2;

 	if (rlen > 1 && wlen == 0) {
 		/*
 		 * Between the command and the response data there is a
 		 * dummy clock cycle. Add an extra bit after the command
 		 * word to account for this.
 		 */
 		x->bits_per_word = 10;
 		cmd <<= 1;
 	}
 	spi_message_add_tail(x, &m);

 	if (wlen) {
 		x++;
 		x->tx_buf = wbuf;
 		x->len = wlen;
 		x->bits_per_word = 9;
 		spi_message_add_tail(x, &m);
 	}

 	if (rlen) {
 		x++;
 		x->rx_buf	= rbuf;
 		x->len		= rlen;
 		spi_message_add_tail(x, &m);
 	}

 	r = spi_sync(md->spi, &m);
 	if (r < 0)
 		dev_dbg(&md->spi->dev, "spi_sync %d\n", r);
 }

 static inline void acx565akm_cmd(struct acx565akm_device *md, int cmd)
 {
 	acx565akm_transfer(md, cmd, NULL, 0, NULL, 0);
 }

 static inline void acx565akm_write(struct acx565akm_device *md,
 			       int reg, const u8 *buf, int len)
 {
 	acx565akm_transfer(md, reg, buf, len, NULL, 0);
 }

 static inline void acx565akm_read(struct acx565akm_device *md,
 			      int reg, u8 *buf, int len)
 {
 	acx565akm_transfer(md, reg, NULL, 0, buf, len);
 }

 static void hw_guard_start(struct acx565akm_device *md, int guard_msec)
 {
 	md->hw_guard_wait = msecs_to_jiffies(guard_msec);
 	md->hw_guard_end = jiffies + md->hw_guard_wait;
 }

 static void hw_guard_wait(struct acx565akm_device *md)
 {
 	unsigned long wait = md->hw_guard_end - jiffies;

 	if ((long)wait > 0 && wait <= md->hw_guard_wait) {
 		set_current_state(TASK_UNINTERRUPTIBLE);
 		schedule_timeout(wait);
 	}
 }

 /*----------------------MIPID wrappers----------------------------*/

 static void set_sleep_mode(struct acx565akm_device *md, int on)
 {
 	int cmd;

 	if (on)
 		cmd = MIPID_CMD_SLEEP_IN;
 	else
 		cmd = MIPID_CMD_SLEEP_OUT;
 	/*
 	 * We have to keep 120msec between sleep in/out commands.
 	 * (8.2.15, 8.2.16).
 	 */
 	hw_guard_wait(md);
 	acx565akm_cmd(md, cmd);
 	hw_guard_start(md, 120);
 }

 static void set_display_state(struct acx565akm_device *md, int enabled)
 {
 	int cmd = enabled ? MIPID_CMD_DISP_ON : MIPID_CMD_DISP_OFF;

 	acx565akm_cmd(md, cmd);
 }

 static int panel_enabled(struct acx565akm_device *md)
 {
 	u32 disp_status;
 	int enabled;

 	acx565akm_read(md, MIPID_CMD_READ_DISP_STATUS, (u8 *)&disp_status, 4);
 	disp_status = __be32_to_cpu(disp_status);
 	enabled = (disp_status & (1 << 17)) && (disp_status & (1 << 10));
 	dev_dbg(&md->spi->dev,
 		"LCD panel %senabled by bootloader (status 0x%04x)\n",
 		enabled ? "" : "not ", disp_status);
 	return enabled;
 }

 static int panel_detect(struct acx565akm_device *md)
 {
 	acx565akm_read(md, MIPID_CMD_READ_DISP_ID, md->display_id, 3);
 	dev_dbg(&md->spi->dev, "MIPI display ID: %02x%02x%02x\n",
 		md->display_id[0], md->display_id[1], md->display_id[2]);

 	switch (md->display_id[0]) {
 	case 0x10:
 		md->model = MIPID_VER_ACX565AKM;
 		md->name = "acx565akm";
 		md->has_bc = 1;
 		md->has_cabc = 1;
 		break;
 	case 0x29:
 		md->model = MIPID_VER_L4F00311;
 		md->name = "l4f00311";
 		break;
 	case 0x45:
 		md->model = MIPID_VER_LPH8923;
 		md->name = "lph8923";
 		break;
 	case 0x83:
 		md->model = MIPID_VER_LS041Y3;
 		md->name = "ls041y3";
 		break;
 	default:
 		md->name = "unknown";
 		dev_err(&md->spi->dev, "invalid display ID\n");
 		return -ENODEV;
 	}

 	md->revision = md->display_id[1];

 	dev_info(&md->spi->dev, "omapfb: %s rev %02x LCD detected\n",
 			md->name, md->revision);

 	return 0;
 }

 /*----------------------Backlight Control-------------------------*/

 static void enable_backlight_ctrl(struct acx565akm_device *md, int enable)
 {
 	u16 ctrl;

 	acx565akm_read(md, MIPID_CMD_READ_CTRL_DISP, (u8 *)&ctrl, 1);
 	if (enable) {
 		ctrl |= CTRL_DISP_BRIGHTNESS_CTRL_ON |
 			CTRL_DISP_BACKLIGHT_ON;
 	} else {
 		ctrl &= ~(CTRL_DISP_BRIGHTNESS_CTRL_ON |
 			  CTRL_DISP_BACKLIGHT_ON);
 	}

 	ctrl |= 1 << 8;
 	acx565akm_write(md, MIPID_CMD_WRITE_CTRL_DISP, (u8 *)&ctrl, 2);
 }

 static void set_cabc_mode(struct acx565akm_device *md, unsigned mode)
 {
 	u16 cabc_ctrl;

 	md->cabc_mode = mode;
 	if (!md->enabled)
 		return;
 	cabc_ctrl = 0;
 	acx565akm_read(md, MIPID_CMD_READ_CABC, (u8 *)&cabc_ctrl, 1);
 	cabc_ctrl &= ~3;
 	cabc_ctrl |= (1 << 8) | (mode & 3);
 	acx565akm_write(md, MIPID_CMD_WRITE_CABC, (u8 *)&cabc_ctrl, 2);
 }

 static unsigned get_cabc_mode(struct acx565akm_device *md)
 {
 	return md->cabc_mode;
 }

 static unsigned get_hw_cabc_mode(struct acx565akm_device *md)
 {
 	u8 cabc_ctrl;

 	acx565akm_read(md, MIPID_CMD_READ_CABC, &cabc_ctrl, 1);
 	return cabc_ctrl & 3;
 }

 static void acx565akm_set_brightness(struct acx565akm_device *md, int level)
 {
 	int bv;

 	bv = level | (1 << 8);
 	acx565akm_write(md, MIPID_CMD_WRITE_DISP_BRIGHTNESS, (u8 *)&bv, 2);

 	if (level)
 		enable_backlight_ctrl(md, 1);
 	else
 		enable_backlight_ctrl(md, 0);
 }

 static int acx565akm_get_actual_brightness(struct acx565akm_device *md)
 {
 	u8 bv;

 	acx565akm_read(md, MIPID_CMD_READ_DISP_BRIGHTNESS, &bv, 1);

 	return bv;
 }


 static int acx565akm_bl_update_status(struct backlight_device *dev)
 {
 	struct acx565akm_device *md = dev_get_drvdata(&dev->dev);
 	int r;
 	int level;

 	dev_dbg(&md->spi->dev, "%s\n", __func__);

 	mutex_lock(&md->mutex);

 	if (dev->props.fb_blank == FB_BLANK_UNBLANK &&
 			dev->props.power == FB_BLANK_UNBLANK)
 		level = dev->props.brightness;
 	else
 		level = 0;

 	r = 0;
 	if (md->has_bc)
 		acx565akm_set_brightness(md, level);
 	else if (md->dssdev->set_backlight)
 		r = md->dssdev->set_backlight(md->dssdev, level);
 	else
 		r = -ENODEV;

 	mutex_unlock(&md->mutex);

 	return r;
 }

 static int acx565akm_bl_get_intensity(struct backlight_device *dev)
 {
 	struct acx565akm_device *md = dev_get_drvdata(&dev->dev);

 	dev_dbg(&dev->dev, "%s\n", __func__);

 	if (!md->has_bc && md->dssdev->set_backlight == NULL)
 		return -ENODEV;

 	if (dev->props.fb_blank == FB_BLANK_UNBLANK &&
 			dev->props.power == FB_BLANK_UNBLANK) {
 		if (md->has_bc)
 			return acx565akm_get_actual_brightness(md);
 		else
 			return dev->props.brightness;
 	}

 	return 0;
 }

 static const struct backlight_ops acx565akm_bl_ops = {
 	.get_brightness = acx565akm_bl_get_intensity,
 	.update_status  = acx565akm_bl_update_status,
 };

 /*--------------------Auto Brightness control via Sysfs---------------------*/

 static const char *cabc_modes[] = {
 	"off",		/* always used when CABC is not supported */
 	"ui",
 	"still-image",
 	"moving-image",
 };

 static ssize_t show_cabc_mode(struct device *dev,
 		struct device_attribute *attr,
 		char *buf)
 {
 	struct acx565akm_device *md = dev_get_drvdata(dev);
 	const char *mode_str;
 	int mode;
 	int len;

 	if (!md->has_cabc)
 		mode = 0;
 	else
 		mode = get_cabc_mode(md);
 	mode_str = "unknown";
 	if (mode >= 0 && mode < ARRAY_SIZE(cabc_modes))
 		mode_str = cabc_modes[mode];
 	len = snprintf(buf, PAGE_SIZE, "%s\n", mode_str);

 	return len < PAGE_SIZE - 1 ? len : PAGE_SIZE - 1;
 }

 static ssize_t store_cabc_mode(struct device *dev,
 		struct device_attribute *attr,
 		const char *buf, size_t count)
 {
 	struct acx565akm_device *md = dev_get_drvdata(dev);
 	int i;

 	for (i = 0; i < ARRAY_SIZE(cabc_modes); i++) {
 		const char *mode_str = cabc_modes[i];
 		int cmp_len = strlen(mode_str);

 		if (count > 0 && buf[count - 1] == '\n')
 			count--;
 		if (count != cmp_len)
 			continue;

 		if (strncmp(buf, mode_str, cmp_len) == 0)
 			break;
 	}

 	if (i == ARRAY_SIZE(cabc_modes))
 		return -EINVAL;

 	if (!md->has_cabc && i != 0)
 		return -EINVAL;

 	mutex_lock(&md->mutex);
 	set_cabc_mode(md, i);
 	mutex_unlock(&md->mutex);

 	return count;
 }

 static ssize_t show_cabc_available_modes(struct device *dev,
 		struct device_attribute *attr,
 		char *buf)
 {
 	struct acx565akm_device *md = dev_get_drvdata(dev);
 	int len;
 	int i;

 	if (!md->has_cabc)
 		return snprintf(buf, PAGE_SIZE, "%s\n", cabc_modes[0]);

 	for (i = 0, len = 0;
 	     len < PAGE_SIZE && i < ARRAY_SIZE(cabc_modes); i++)
 		len += snprintf(&buf[len], PAGE_SIZE - len, "%s%s%s",
 			i ? " " : "", cabc_modes[i],
 			i == ARRAY_SIZE(cabc_modes) - 1 ? "\n" : "");

 	return len < PAGE_SIZE ? len : PAGE_SIZE - 1;
 }

 static DEVICE_ATTR(cabc_mode, S_IRUGO | S_IWUSR,
 		show_cabc_mode, store_cabc_mode);
 static DEVICE_ATTR(cabc_available_modes, S_IRUGO,
 		show_cabc_available_modes, NULL);

 static struct attribute *bldev_attrs[] = {
 	&dev_attr_cabc_mode.attr,
 	&dev_attr_cabc_available_modes.attr,
 	NULL,
 };

 static struct attribute_group bldev_attr_group = {
 	.attrs = bldev_attrs,
 };


 /*---------------------------ACX Panel----------------------------*/

 static int acx_get_recommended_bpp(struct omap_dss_device *dssdev)
 {
 	return 16;
 }

 static struct omap_video_timings acx_panel_timings = {
 	.x_res		= 800,
 	.y_res		= 480,
 	.pixel_clock	= 24000,
 	.hfp		= 28,
 	.hsw		= 4,
 	.hbp		= 24,
 	.vfp		= 3,
 	.vsw		= 3,
 	.vbp		= 4,

 	.vsync_level	= OMAPDSS_SIG_ACTIVE_LOW,
 	.hsync_level	= OMAPDSS_SIG_ACTIVE_LOW,

 	.data_pclk_edge	= OMAPDSS_DRIVE_SIG_RISING_EDGE,
 	.de_level	= OMAPDSS_SIG_ACTIVE_HIGH,
 	.sync_pclk_edge	= OMAPDSS_DRIVE_SIG_OPPOSITE_EDGES,
 };

 static int acx_panel_probe(struct omap_dss_device *dssdev)
 {
 	int r;
 	struct acx565akm_device *md = &acx_dev;
 	struct backlight_device *bldev;
 	int max_brightness, brightness;
 	struct backlight_properties props;

 	dev_dbg(&dssdev->dev, "%s\n", __func__);

 	/* FIXME AC bias ? */
 	dssdev->panel.timings = acx_panel_timings;

 	if (dssdev->platform_enable)
 		dssdev->platform_enable(dssdev);
 	/*
 	 * After reset we have to wait 5 msec before the first
 	 * command can be sent.
 	 */
 	msleep(5);

 	md->enabled = panel_enabled(md);

 	r = panel_detect(md);
 	if (r) {
 		dev_err(&dssdev->dev, "%s panel detect error\n", __func__);
 		if (!md->enabled && dssdev->platform_disable)
 			dssdev->platform_disable(dssdev);
 		return r;
 	}

 	mutex_lock(&acx_dev.mutex);
 	acx_dev.dssdev = dssdev;
 	mutex_unlock(&acx_dev.mutex);

 	if (!md->enabled) {
 		if (dssdev->platform_disable)
 			dssdev->platform_disable(dssdev);
 	}

 	/*------- Backlight control --------*/

 	memset(&props, 0, sizeof(props));
 	props.fb_blank = FB_BLANK_UNBLANK;
 	props.power = FB_BLANK_UNBLANK;
 	props.type = BACKLIGHT_RAW;

 	bldev = backlight_device_register("acx565akm", &md->spi->dev,
 			md, &acx565akm_bl_ops, &props);
 	md->bl_dev = bldev;
 	if (md->has_cabc) {
 		r = sysfs_create_group(&bldev->dev.kobj, &bldev_attr_group);
 		if (r) {
 			dev_err(&bldev->dev,
 				"%s failed to create sysfs files\n", __func__);
 			backlight_device_unregister(bldev);
 			return r;
 		}
 		md->cabc_mode = get_hw_cabc_mode(md);
 	}

 	if (md->has_bc)
 		max_brightness = 255;
 	else
 		max_brightness = dssdev->max_backlight_level;

 	if (md->has_bc)
 		brightness = acx565akm_get_actual_brightness(md);
 	else if (dssdev->get_backlight)
 		brightness = dssdev->get_backlight(dssdev);
 	else
 		brightness = 0;

 	bldev->props.max_brightness = max_brightness;
 	bldev->props.brightness = brightness;

 	acx565akm_bl_update_status(bldev);
 	return 0;
 }

 static void acx_panel_remove(struct omap_dss_device *dssdev)
 {
 	struct acx565akm_device *md = &acx_dev;

 	dev_dbg(&dssdev->dev, "%s\n", __func__);
 	sysfs_remove_group(&md->bl_dev->dev.kobj, &bldev_attr_group);
 	backlight_device_unregister(md->bl_dev);
 	mutex_lock(&acx_dev.mutex);
 	acx_dev.dssdev = NULL;
 	mutex_unlock(&acx_dev.mutex);
 }

 static int acx_panel_power_on(struct omap_dss_device *dssdev)
 {
 	struct acx565akm_device *md = &acx_dev;
 	int r;

 	dev_dbg(&dssdev->dev, "%s\n", __func__);

 	if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
 		return 0;

 	mutex_lock(&md->mutex);

 	omapdss_sdi_set_timings(dssdev, &dssdev->panel.timings);
 	omapdss_sdi_set_datapairs(dssdev, dssdev->phy.sdi.datapairs);

 	r = omapdss_sdi_display_enable(dssdev);
 	if (r) {
 		pr_err("%s sdi enable failed\n", __func__);
 		goto fail_unlock;
 	}

 	/*FIXME tweak me */
 	msleep(50);

 	if (dssdev->platform_enable) {
 		r = dssdev->platform_enable(dssdev);
 		if (r)
 			goto fail;
 	}

 	if (md->enabled) {
 		dev_dbg(&md->spi->dev, "panel already enabled\n");
 		mutex_unlock(&md->mutex);
 		return 0;
 	}

 	/*
 	 * We have to meet all the following delay requirements:
 	 * 1. tRW: reset pulse width 10usec (7.12.1)
 	 * 2. tRT: reset cancel time 5msec (7.12.1)
 	 * 3. Providing PCLK,HS,VS signals for 2 frames = ~50msec worst
 	 *    case (7.6.2)
 	 * 4. 120msec before the sleep out command (7.12.1)
 	 */
 	msleep(120);

 	set_sleep_mode(md, 0);
 	md->enabled = 1;

 	/* 5msec between sleep out and the next command. (8.2.16) */
 	msleep(5);
 	set_display_state(md, 1);
 	set_cabc_mode(md, md->cabc_mode);

 	mutex_unlock(&md->mutex);

 	return acx565akm_bl_update_status(md->bl_dev);
 fail:
 	omapdss_sdi_display_disable(dssdev);
 fail_unlock:
 	mutex_unlock(&md->mutex);
 	return r;
 }

 static void acx_panel_power_off(struct omap_dss_device *dssdev)
 {
 	struct acx565akm_device *md = &acx_dev;

 	dev_dbg(&dssdev->dev, "%s\n", __func__);

 	if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
 		return;

 	mutex_lock(&md->mutex);

 	if (!md->enabled) {
 		mutex_unlock(&md->mutex);
 		return;
 	}
 	set_display_state(md, 0);
 	set_sleep_mode(md, 1);
 	md->enabled = 0;
 	/*
 	 * We have to provide PCLK,HS,VS signals for 2 frames (worst case
 	 * ~50msec) after sending the sleep in command and asserting the
 	 * reset signal. We probably could assert the reset w/o the delay
 	 * but we still delay to avoid possible artifacts. (7.6.1)
 	 */
 	msleep(50);

 	if (dssdev->platform_disable)
 		dssdev->platform_disable(dssdev);

 	/* FIXME need to tweak this delay */
 	msleep(100);

 	omapdss_sdi_display_disable(dssdev);

 	mutex_unlock(&md->mutex);
 }

 static int acx_panel_enable(struct omap_dss_device *dssdev)
 {
 	int r;

 	dev_dbg(&dssdev->dev, "%s\n", __func__);
 	r = acx_panel_power_on(dssdev);

 	if (r)
 		return r;

 	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 	return 0;
 }

 static void acx_panel_disable(struct omap_dss_device *dssdev)
 {
 	dev_dbg(&dssdev->dev, "%s\n", __func__);
 	acx_panel_power_off(dssdev);
 	dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 }

 static void acx_panel_set_timings(struct omap_dss_device *dssdev,
 		struct omap_video_timings *timings)
 {
 	omapdss_sdi_set_timings(dssdev, timings);

 	dssdev->panel.timings = *timings;
 }

 static int acx_panel_check_timings(struct omap_dss_device *dssdev,
 		struct omap_video_timings *timings)
 {
 	return 0;
 }


 static struct omap_dss_driver acx_panel_driver = {
 	.probe		= acx_panel_probe,
 	.remove		= acx_panel_remove,

 	.enable		= acx_panel_enable,
 	.disable	= acx_panel_disable,

 	.set_timings	= acx_panel_set_timings,
 	.check_timings	= acx_panel_check_timings,

 	.get_recommended_bpp = acx_get_recommended_bpp,

 	.driver         = {
 		.name   = "panel-acx565akm",
 		.owner  = THIS_MODULE,
 	},
 };

 /*--------------------SPI probe-------------------------*/

 static int acx565akm_spi_probe(struct spi_device *spi)
 {
 	struct acx565akm_device *md = &acx_dev;

 	dev_dbg(&spi->dev, "%s\n", __func__);

 	spi->mode = SPI_MODE_3;
 	md->spi = spi;
 	mutex_init(&md->mutex);
 	dev_set_drvdata(&spi->dev, md);

 	omap_dss_register_driver(&acx_panel_driver);

 	return 0;
 }

 static int acx565akm_spi_remove(struct spi_device *spi)
 {
 	struct acx565akm_device *md = dev_get_drvdata(&spi->dev);

 	dev_dbg(&md->spi->dev, "%s\n", __func__);
 	omap_dss_unregister_driver(&acx_panel_driver);

 	return 0;
 }

 static struct spi_driver acx565akm_spi_driver = {
 	.driver = {
 		.name	= "acx565akm",
 		.owner	= THIS_MODULE,
 	},
 	.probe	= acx565akm_spi_probe,
 	.remove	= __devexit_p(acx565akm_spi_remove),
 };

 module_spi_driver(acx565akm_spi_driver);

 MODULE_AUTHOR("Nokia Corporation");
 MODULE_DESCRIPTION("acx565akm LCD Driver");
 MODULE_LICENSE("GPL");
	/*
	* Support for ACX565AKM LCD Panel used on Nokia N900
	*
	* Copyright (C) 2010 Nokia Corporation
	*
	* Original Driver Author: Imre Deak <imre.deak@nokia.com>
	* Based on panel-generic.c by Tomi Valkeinen <tomi.valkeinen@nokia.com>
	* Adapted to new DSS2 framework: Roger Quadros <roger.quadros@nokia.com>
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 as published by
	* the Free Software Foundation.
	*
	* This program 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 program. If not, see <http://www.gnu.org/licenses/>.
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/delay.h>
	#include <linux/spi/spi.h>
	#include <linux/jiffies.h>
	#include <linux/sched.h>
	#include <linux/backlight.h>
	#include <linux/fb.h>

	#include <video/omapdss.h>

	#define MIPID_CMD_READ_DISP_ID 0x04
	#define MIPID_CMD_READ_RED 0x06
	#define MIPID_CMD_READ_GREEN 0x07
	#define MIPID_CMD_READ_BLUE 0x08
	#define MIPID_CMD_READ_DISP_STATUS 0x09
	#define MIPID_CMD_RDDSDR 0x0F
	#define MIPID_CMD_SLEEP_IN 0x10
	#define MIPID_CMD_SLEEP_OUT 0x11
	#define MIPID_CMD_DISP_OFF 0x28
	#define MIPID_CMD_DISP_ON 0x29
	#define MIPID_CMD_WRITE_DISP_BRIGHTNESS 0x51
	#define MIPID_CMD_READ_DISP_BRIGHTNESS 0x52
	#define MIPID_CMD_WRITE_CTRL_DISP 0x53

	#define CTRL_DISP_BRIGHTNESS_CTRL_ON (1 << 5)
	#define CTRL_DISP_AMBIENT_LIGHT_CTRL_ON (1 << 4)
	#define CTRL_DISP_BACKLIGHT_ON (1 << 2)
	#define CTRL_DISP_AUTO_BRIGHTNESS_ON (1 << 1)

	#define MIPID_CMD_READ_CTRL_DISP 0x54
	#define MIPID_CMD_WRITE_CABC 0x55
	#define MIPID_CMD_READ_CABC 0x56

	#define MIPID_VER_LPH8923 3
	#define MIPID_VER_LS041Y3 4
	#define MIPID_VER_L4F00311 8
	#define MIPID_VER_ACX565AKM 9

	struct acx565akm_device {
	char *name;
	int enabled;
	int model;
	int revision;
	u8 display_id[3];
	unsigned has_bc:1;
	unsigned has_cabc:1;
	unsigned cabc_mode;
	unsigned long hw_guard_end; /* next value of jiffies
	when we can issue the
	next sleep in/out command */
	unsigned long hw_guard_wait; /* max guard time in jiffies */

	struct spi_device *spi;
	struct mutex mutex;

	struct omap_dss_device *dssdev;
	struct backlight_device *bl_dev;
	};

	static struct acx565akm_device acx_dev;
	static int acx565akm_bl_update_status(struct backlight_device *dev);

	/--------------------MIPID interface-----------------------------/

	static void acx565akm_transfer(struct acx565akm_device *md, int cmd,
	const u8 wbuf, int wlen, u8 rbuf, int rlen)
	{
	struct spi_message m;
	struct spi_transfer *x, xfer[5];
	int r;

	BUG_ON(md->spi == NULL);

	spi_message_init(&m);

	memset(xfer, 0, sizeof(xfer));
	x = &xfer[0];

	cmd &= 0xff;
	x->tx_buf = &cmd;
	x->bits_per_word = 9;
	x->len = 2;

	if (rlen > 1 && wlen == 0) {
	/*
	* Between the command and the response data there is a
	* dummy clock cycle. Add an extra bit after the command
	* word to account for this.
	*/
	x->bits_per_word = 10;
	cmd <<= 1;
	}
	spi_message_add_tail(x, &m);

	if (wlen) {
	x++;
	x->tx_buf = wbuf;
	x->len = wlen;
	x->bits_per_word = 9;
	spi_message_add_tail(x, &m);
	}

	if (rlen) {
	x++;
	x->rx_buf = rbuf;
	x->len = rlen;
	spi_message_add_tail(x, &m);
	}

	r = spi_sync(md->spi, &m);
	if (r < 0)
	dev_dbg(&md->spi->dev, "spi_sync %d\n", r);
	}

	static inline void acx565akm_cmd(struct acx565akm_device *md, int cmd)
	{
	acx565akm_transfer(md, cmd, NULL, 0, NULL, 0);
	}

	static inline void acx565akm_write(struct acx565akm_device *md,
	int reg, const u8 *buf, int len)
	{
	acx565akm_transfer(md, reg, buf, len, NULL, 0);
	}

	static inline void acx565akm_read(struct acx565akm_device *md,
	int reg, u8 *buf, int len)
	{
	acx565akm_transfer(md, reg, NULL, 0, buf, len);
	}

	static void hw_guard_start(struct acx565akm_device *md, int guard_msec)
	{
	md->hw_guard_wait = msecs_to_jiffies(guard_msec);
	md->hw_guard_end = jiffies + md->hw_guard_wait;
	}

	static void hw_guard_wait(struct acx565akm_device *md)
	{
	unsigned long wait = md->hw_guard_end - jiffies;

	if ((long)wait > 0 && wait <= md->hw_guard_wait) {
	set_current_state(TASK_UNINTERRUPTIBLE);
	schedule_timeout(wait);
	}
	}

	/----------------------MIPID wrappers----------------------------/

	static void set_sleep_mode(struct acx565akm_device *md, int on)
	{
	int cmd;

	if (on)
	cmd = MIPID_CMD_SLEEP_IN;
	else
	cmd = MIPID_CMD_SLEEP_OUT;
	/*
	* We have to keep 120msec between sleep in/out commands.
	* (8.2.15, 8.2.16).
	*/
	hw_guard_wait(md);
	acx565akm_cmd(md, cmd);
	hw_guard_start(md, 120);
	}

	static void set_display_state(struct acx565akm_device *md, int enabled)
	{
	int cmd = enabled ? MIPID_CMD_DISP_ON : MIPID_CMD_DISP_OFF;

	acx565akm_cmd(md, cmd);
	}

	static int panel_enabled(struct acx565akm_device *md)
	{
	u32 disp_status;
	int enabled;

	acx565akm_read(md, MIPID_CMD_READ_DISP_STATUS, (u8 *)&disp_status, 4);
	disp_status = __be32_to_cpu(disp_status);
	enabled = (disp_status & (1 << 17)) && (disp_status & (1 << 10));
	dev_dbg(&md->spi->dev,
	"LCD panel %senabled by bootloader (status 0x%04x)\n",
	enabled ? "" : "not ", disp_status);
	return enabled;
	}

	static int panel_detect(struct acx565akm_device *md)
	{
	acx565akm_read(md, MIPID_CMD_READ_DISP_ID, md->display_id, 3);
	dev_dbg(&md->spi->dev, "MIPI display ID: %02x%02x%02x\n",
	md->display_id[0], md->display_id[1], md->display_id[2]);

	switch (md->display_id[0]) {
	case 0x10:
	md->model = MIPID_VER_ACX565AKM;
	md->name = "acx565akm";
	md->has_bc = 1;
	md->has_cabc = 1;
	break;
	case 0x29:
	md->model = MIPID_VER_L4F00311;
	md->name = "l4f00311";
	break;
	case 0x45:
	md->model = MIPID_VER_LPH8923;
	md->name = "lph8923";
	break;
	case 0x83:
	md->model = MIPID_VER_LS041Y3;
	md->name = "ls041y3";
	break;
	default:
	md->name = "unknown";
	dev_err(&md->spi->dev, "invalid display ID\n");
	return -ENODEV;
	}

	md->revision = md->display_id[1];

	dev_info(&md->spi->dev, "omapfb: %s rev %02x LCD detected\n",
	md->name, md->revision);

	return 0;
	}

	/----------------------Backlight Control-------------------------/

	static void enable_backlight_ctrl(struct acx565akm_device *md, int enable)
	{
	u16 ctrl;

	acx565akm_read(md, MIPID_CMD_READ_CTRL_DISP, (u8 *)&ctrl, 1);
	if (enable) {
	ctrl \|= CTRL_DISP_BRIGHTNESS_CTRL_ON \|
	CTRL_DISP_BACKLIGHT_ON;
	} else {
	ctrl &= ~(CTRL_DISP_BRIGHTNESS_CTRL_ON \|
	CTRL_DISP_BACKLIGHT_ON);
	}

	ctrl \|= 1 << 8;
	acx565akm_write(md, MIPID_CMD_WRITE_CTRL_DISP, (u8 *)&ctrl, 2);
	}

	static void set_cabc_mode(struct acx565akm_device *md, unsigned mode)
	{
	u16 cabc_ctrl;

	md->cabc_mode = mode;
	if (!md->enabled)
	return;
	cabc_ctrl = 0;
	acx565akm_read(md, MIPID_CMD_READ_CABC, (u8 *)&cabc_ctrl, 1);
	cabc_ctrl &= ~3;
	cabc_ctrl \|= (1 << 8) \| (mode & 3);
	acx565akm_write(md, MIPID_CMD_WRITE_CABC, (u8 *)&cabc_ctrl, 2);
	}

	static unsigned get_cabc_mode(struct acx565akm_device *md)
	{
	return md->cabc_mode;
	}

	static unsigned get_hw_cabc_mode(struct acx565akm_device *md)
	{
	u8 cabc_ctrl;

	acx565akm_read(md, MIPID_CMD_READ_CABC, &cabc_ctrl, 1);
	return cabc_ctrl & 3;
	}

	static void acx565akm_set_brightness(struct acx565akm_device *md, int level)
	{
	int bv;

	bv = level \| (1 << 8);
	acx565akm_write(md, MIPID_CMD_WRITE_DISP_BRIGHTNESS, (u8 *)&bv, 2);

	if (level)
	enable_backlight_ctrl(md, 1);
	else
	enable_backlight_ctrl(md, 0);
	}

	static int acx565akm_get_actual_brightness(struct acx565akm_device *md)
	{
	u8 bv;

	acx565akm_read(md, MIPID_CMD_READ_DISP_BRIGHTNESS, &bv, 1);

	return bv;
	}


	static int acx565akm_bl_update_status(struct backlight_device *dev)
	{
	struct acx565akm_device *md = dev_get_drvdata(&dev->dev);
	int r;
	int level;

	dev_dbg(&md->spi->dev, "%s\n", __func__);

	mutex_lock(&md->mutex);

	if (dev->props.fb_blank == FB_BLANK_UNBLANK &&
	dev->props.power == FB_BLANK_UNBLANK)
	level = dev->props.brightness;
	else
	level = 0;

	r = 0;
	if (md->has_bc)
	acx565akm_set_brightness(md, level);
	else if (md->dssdev->set_backlight)
	r = md->dssdev->set_backlight(md->dssdev, level);
	else
	r = -ENODEV;

	mutex_unlock(&md->mutex);

	return r;
	}

	static int acx565akm_bl_get_intensity(struct backlight_device *dev)
	{
	struct acx565akm_device *md = dev_get_drvdata(&dev->dev);

	dev_dbg(&dev->dev, "%s\n", __func__);

	if (!md->has_bc && md->dssdev->set_backlight == NULL)
	return -ENODEV;

	if (dev->props.fb_blank == FB_BLANK_UNBLANK &&
	dev->props.power == FB_BLANK_UNBLANK) {
	if (md->has_bc)
	return acx565akm_get_actual_brightness(md);
	else
	return dev->props.brightness;
	}

	return 0;
	}

	static const struct backlight_ops acx565akm_bl_ops = {
	.get_brightness = acx565akm_bl_get_intensity,
	.update_status = acx565akm_bl_update_status,
	};

	/--------------------Auto Brightness control via Sysfs---------------------/

	static const char *cabc_modes[] = {
	"off", /* always used when CABC is not supported */
	"ui",
	"still-image",
	"moving-image",
	};

	static ssize_t show_cabc_mode(struct device *dev,
	struct device_attribute *attr,
	char *buf)
	{
	struct acx565akm_device *md = dev_get_drvdata(dev);
	const char *mode_str;
	int mode;
	int len;

	if (!md->has_cabc)
	mode = 0;
	else
	mode = get_cabc_mode(md);
	mode_str = "unknown";
	if (mode >= 0 && mode < ARRAY_SIZE(cabc_modes))
	mode_str = cabc_modes[mode];
	len = snprintf(buf, PAGE_SIZE, "%s\n", mode_str);

	return len < PAGE_SIZE - 1 ? len : PAGE_SIZE - 1;
	}

	static ssize_t store_cabc_mode(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t count)
	{
	struct acx565akm_device *md = dev_get_drvdata(dev);
	int i;

	for (i = 0; i < ARRAY_SIZE(cabc_modes); i++) {
	const char *mode_str = cabc_modes[i];
	int cmp_len = strlen(mode_str);

	if (count > 0 && buf[count - 1] == '\n')
	count--;
	if (count != cmp_len)
	continue;

	if (strncmp(buf, mode_str, cmp_len) == 0)
	break;
	}

	if (i == ARRAY_SIZE(cabc_modes))
	return -EINVAL;

	if (!md->has_cabc && i != 0)
	return -EINVAL;

	mutex_lock(&md->mutex);
	set_cabc_mode(md, i);
	mutex_unlock(&md->mutex);

	return count;
	}

	static ssize_t show_cabc_available_modes(struct device *dev,
	struct device_attribute *attr,
	char *buf)
	{
	struct acx565akm_device *md = dev_get_drvdata(dev);
	int len;
	int i;

	if (!md->has_cabc)
	return snprintf(buf, PAGE_SIZE, "%s\n", cabc_modes[0]);

	for (i = 0, len = 0;
	len < PAGE_SIZE && i < ARRAY_SIZE(cabc_modes); i++)
	len += snprintf(&buf[len], PAGE_SIZE - len, "%s%s%s",
	i ? " " : "", cabc_modes[i],
	i == ARRAY_SIZE(cabc_modes) - 1 ? "\n" : "");

	return len < PAGE_SIZE ? len : PAGE_SIZE - 1;
	}

	static DEVICE_ATTR(cabc_mode, S_IRUGO \| S_IWUSR,
	show_cabc_mode, store_cabc_mode);
	static DEVICE_ATTR(cabc_available_modes, S_IRUGO,
	show_cabc_available_modes, NULL);

	static struct attribute *bldev_attrs[] = {
	&dev_attr_cabc_mode.attr,
	&dev_attr_cabc_available_modes.attr,
	NULL,
	};

	static struct attribute_group bldev_attr_group = {
	.attrs = bldev_attrs,
	};


	/---------------------------ACX Panel----------------------------/

	static int acx_get_recommended_bpp(struct omap_dss_device *dssdev)
	{
	return 16;
	}

	static struct omap_video_timings acx_panel_timings = {
	.x_res = 800,
	.y_res = 480,
	.pixel_clock = 24000,
	.hfp = 28,
	.hsw = 4,
	.hbp = 24,
	.vfp = 3,
	.vsw = 3,
	.vbp = 4,

	.vsync_level = OMAPDSS_SIG_ACTIVE_LOW,
	.hsync_level = OMAPDSS_SIG_ACTIVE_LOW,

	.data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE,
	.de_level = OMAPDSS_SIG_ACTIVE_HIGH,
	.sync_pclk_edge = OMAPDSS_DRIVE_SIG_OPPOSITE_EDGES,
	};

	static int acx_panel_probe(struct omap_dss_device *dssdev)
	{
	int r;
	struct acx565akm_device *md = &acx_dev;
	struct backlight_device *bldev;
	int max_brightness, brightness;
	struct backlight_properties props;

	dev_dbg(&dssdev->dev, "%s\n", __func__);

	/* FIXME AC bias ? */
	dssdev->panel.timings = acx_panel_timings;

	if (dssdev->platform_enable)
	dssdev->platform_enable(dssdev);
	/*
	* After reset we have to wait 5 msec before the first
	* command can be sent.
	*/
	msleep(5);

	md->enabled = panel_enabled(md);

	r = panel_detect(md);
	if (r) {
	dev_err(&dssdev->dev, "%s panel detect error\n", __func__);
	if (!md->enabled && dssdev->platform_disable)
	dssdev->platform_disable(dssdev);
	return r;
	}

	mutex_lock(&acx_dev.mutex);
	acx_dev.dssdev = dssdev;
	mutex_unlock(&acx_dev.mutex);

	if (!md->enabled) {
	if (dssdev->platform_disable)
	dssdev->platform_disable(dssdev);
	}

	/------- Backlight control --------/

	memset(&props, 0, sizeof(props));
	props.fb_blank = FB_BLANK_UNBLANK;
	props.power = FB_BLANK_UNBLANK;
	props.type = BACKLIGHT_RAW;

	bldev = backlight_device_register("acx565akm", &md->spi->dev,
	md, &acx565akm_bl_ops, &props);
	md->bl_dev = bldev;
	if (md->has_cabc) {
	r = sysfs_create_group(&bldev->dev.kobj, &bldev_attr_group);
	if (r) {
	dev_err(&bldev->dev,
	"%s failed to create sysfs files\n", __func__);
	backlight_device_unregister(bldev);
	return r;
	}
	md->cabc_mode = get_hw_cabc_mode(md);
	}

	if (md->has_bc)
	max_brightness = 255;
	else
	max_brightness = dssdev->max_backlight_level;

	if (md->has_bc)
	brightness = acx565akm_get_actual_brightness(md);
	else if (dssdev->get_backlight)
	brightness = dssdev->get_backlight(dssdev);
	else
	brightness = 0;

	bldev->props.max_brightness = max_brightness;
	bldev->props.brightness = brightness;

	acx565akm_bl_update_status(bldev);
	return 0;
	}

	static void acx_panel_remove(struct omap_dss_device *dssdev)
	{
	struct acx565akm_device *md = &acx_dev;

	dev_dbg(&dssdev->dev, "%s\n", __func__);
	sysfs_remove_group(&md->bl_dev->dev.kobj, &bldev_attr_group);
	backlight_device_unregister(md->bl_dev);
	mutex_lock(&acx_dev.mutex);
	acx_dev.dssdev = NULL;
	mutex_unlock(&acx_dev.mutex);
	}

	static int acx_panel_power_on(struct omap_dss_device *dssdev)
	{
	struct acx565akm_device *md = &acx_dev;
	int r;

	dev_dbg(&dssdev->dev, "%s\n", __func__);

	if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
	return 0;

	mutex_lock(&md->mutex);

	omapdss_sdi_set_timings(dssdev, &dssdev->panel.timings);
	omapdss_sdi_set_datapairs(dssdev, dssdev->phy.sdi.datapairs);

	r = omapdss_sdi_display_enable(dssdev);
	if (r) {
	pr_err("%s sdi enable failed\n", __func__);
	goto fail_unlock;
	}

	/FIXME tweak me /
	msleep(50);

	if (dssdev->platform_enable) {
	r = dssdev->platform_enable(dssdev);
	if (r)
	goto fail;
	}

	if (md->enabled) {
	dev_dbg(&md->spi->dev, "panel already enabled\n");
	mutex_unlock(&md->mutex);
	return 0;
	}

	/*
	* We have to meet all the following delay requirements:
	* 1. tRW: reset pulse width 10usec (7.12.1)
	* 2. tRT: reset cancel time 5msec (7.12.1)
	* 3. Providing PCLK,HS,VS signals for 2 frames = ~50msec worst
	* case (7.6.2)
	* 4. 120msec before the sleep out command (7.12.1)
	*/
	msleep(120);

	set_sleep_mode(md, 0);
	md->enabled = 1;

	/* 5msec between sleep out and the next command. (8.2.16) */
	msleep(5);
	set_display_state(md, 1);
	set_cabc_mode(md, md->cabc_mode);

	mutex_unlock(&md->mutex);

	return acx565akm_bl_update_status(md->bl_dev);
	fail:
	omapdss_sdi_display_disable(dssdev);
	fail_unlock:
	mutex_unlock(&md->mutex);
	return r;
	}

	static void acx_panel_power_off(struct omap_dss_device *dssdev)
	{
	struct acx565akm_device *md = &acx_dev;

	dev_dbg(&dssdev->dev, "%s\n", __func__);

	if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
	return;

	mutex_lock(&md->mutex);

	if (!md->enabled) {
	mutex_unlock(&md->mutex);
	return;
	}
	set_display_state(md, 0);
	set_sleep_mode(md, 1);
	md->enabled = 0;
	/*
	* We have to provide PCLK,HS,VS signals for 2 frames (worst case
	* ~50msec) after sending the sleep in command and asserting the
	* reset signal. We probably could assert the reset w/o the delay
	* but we still delay to avoid possible artifacts. (7.6.1)
	*/
	msleep(50);

	if (dssdev->platform_disable)
	dssdev->platform_disable(dssdev);

	/* FIXME need to tweak this delay */
	msleep(100);

	omapdss_sdi_display_disable(dssdev);

	mutex_unlock(&md->mutex);
	}

	static int acx_panel_enable(struct omap_dss_device *dssdev)
	{
	int r;

	dev_dbg(&dssdev->dev, "%s\n", __func__);
	r = acx_panel_power_on(dssdev);

	if (r)
	return r;

	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
	return 0;
	}

	static void acx_panel_disable(struct omap_dss_device *dssdev)
	{
	dev_dbg(&dssdev->dev, "%s\n", __func__);
	acx_panel_power_off(dssdev);
	dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
	}

	static void acx_panel_set_timings(struct omap_dss_device *dssdev,
	struct omap_video_timings *timings)
	{
	omapdss_sdi_set_timings(dssdev, timings);

	dssdev->panel.timings = *timings;
	}

	static int acx_panel_check_timings(struct omap_dss_device *dssdev,
	struct omap_video_timings *timings)
	{
	return 0;
	}


	static struct omap_dss_driver acx_panel_driver = {
	.probe = acx_panel_probe,
	.remove = acx_panel_remove,

	.enable = acx_panel_enable,
	.disable = acx_panel_disable,

	.set_timings = acx_panel_set_timings,
	.check_timings = acx_panel_check_timings,

	.get_recommended_bpp = acx_get_recommended_bpp,

	.driver = {
	.name = "panel-acx565akm",
	.owner = THIS_MODULE,
	},
	};

	/--------------------SPI probe-------------------------/

	static int acx565akm_spi_probe(struct spi_device *spi)
	{
	struct acx565akm_device *md = &acx_dev;

	dev_dbg(&spi->dev, "%s\n", __func__);

	spi->mode = SPI_MODE_3;
	md->spi = spi;
	mutex_init(&md->mutex);
	dev_set_drvdata(&spi->dev, md);

	omap_dss_register_driver(&acx_panel_driver);

	return 0;
	}

	static int acx565akm_spi_remove(struct spi_device *spi)
	{
	struct acx565akm_device *md = dev_get_drvdata(&spi->dev);

	dev_dbg(&md->spi->dev, "%s\n", __func__);
	omap_dss_unregister_driver(&acx_panel_driver);

	return 0;
	}

	static struct spi_driver acx565akm_spi_driver = {
	.driver = {
	.name = "acx565akm",
	.owner = THIS_MODULE,
	},
	.probe = acx565akm_spi_probe,
	.remove = __devexit_p(acx565akm_spi_remove),
	};

	module_spi_driver(acx565akm_spi_driver);

	MODULE_AUTHOR("Nokia Corporation");
	MODULE_DESCRIPTION("acx565akm LCD Driver");
	MODULE_LICENSE("GPL");