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/*
* LCD panel driver for Sharp LS037V7DW01
*
* Copyright (C) 2008 Nokia Corporation
* Author: Tomi Valkeinen <tomi.valkeinen@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/module.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/backlight.h>
#include <linux/fb.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <video/omapdss.h>
struct sharp_data {
struct backlight_device *bl;
};
static struct omap_video_timings sharp_ls_timings = {
.x_res = 480,
.y_res = 640,
.pixel_clock = 19200,
.hsw = 2,
.hfp = 1,
.hbp = 28,
.vsw = 1,
.vfp = 1,
.vbp = 1,
.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 sharp_ls_bl_update_status(struct backlight_device *bl)
{
struct omap_dss_device *dssdev = dev_get_drvdata(&bl->dev);
int level;
if (!dssdev->set_backlight)
return -EINVAL;
if (bl->props.fb_blank == FB_BLANK_UNBLANK &&
bl->props.power == FB_BLANK_UNBLANK)
level = bl->props.brightness;
else
level = 0;
return dssdev->set_backlight(dssdev, level);
}
static int sharp_ls_bl_get_brightness(struct backlight_device *bl)
{
if (bl->props.fb_blank == FB_BLANK_UNBLANK &&
bl->props.power == FB_BLANK_UNBLANK)
return bl->props.brightness;
return 0;
}
static const struct backlight_ops sharp_ls_bl_ops = {
.get_brightness = sharp_ls_bl_get_brightness,
.update_status = sharp_ls_bl_update_status,
};
static int sharp_ls_panel_probe(struct omap_dss_device *dssdev)
{
struct backlight_properties props;
struct backlight_device *bl;
struct sharp_data *sd;
int r;
dssdev->panel.timings = sharp_ls_timings;
sd = kzalloc(sizeof(*sd), GFP_KERNEL);
if (!sd)
return -ENOMEM;
dev_set_drvdata(&dssdev->dev, sd);
memset(&props, 0, sizeof(struct backlight_properties));
props.max_brightness = dssdev->max_backlight_level;
props.type = BACKLIGHT_RAW;
bl = backlight_device_register("sharp-ls", &dssdev->dev, dssdev,
&sharp_ls_bl_ops, &props);
if (IS_ERR(bl)) {
r = PTR_ERR(bl);
kfree(sd);
return r;
}
sd->bl = bl;
bl->props.fb_blank = FB_BLANK_UNBLANK;
bl->props.power = FB_BLANK_UNBLANK;
bl->props.brightness = dssdev->max_backlight_level;
r = sharp_ls_bl_update_status(bl);
if (r < 0)
dev_err(&dssdev->dev, "failed to set lcd brightness\n");
return 0;
}
static void __exit sharp_ls_panel_remove(struct omap_dss_device *dssdev)
{
struct sharp_data *sd = dev_get_drvdata(&dssdev->dev);
struct backlight_device *bl = sd->bl;
bl->props.power = FB_BLANK_POWERDOWN;
sharp_ls_bl_update_status(bl);
backlight_device_unregister(bl);
kfree(sd);
}
static int sharp_ls_power_on(struct omap_dss_device *dssdev)
{
int r = 0;
if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
return 0;
omapdss_dpi_set_timings(dssdev, &dssdev->panel.timings);
omapdss_dpi_set_data_lines(dssdev, dssdev->phy.dpi.data_lines);
r = omapdss_dpi_display_enable(dssdev);
if (r)
goto err0;
/* wait couple of vsyncs until enabling the LCD */
msleep(50);
if (dssdev->platform_enable) {
r = dssdev->platform_enable(dssdev);
if (r)
goto err1;
}
return 0;
err1:
omapdss_dpi_display_disable(dssdev);
err0:
return r;
}
static void sharp_ls_power_off(struct omap_dss_device *dssdev)
{
if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
return;
if (dssdev->platform_disable)
dssdev->platform_disable(dssdev);
/* wait at least 5 vsyncs after disabling the LCD */
msleep(100);
omapdss_dpi_display_disable(dssdev);
}
static int sharp_ls_panel_enable(struct omap_dss_device *dssdev)
{
int r;
r = sharp_ls_power_on(dssdev);
dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
return r;
}
static void sharp_ls_panel_disable(struct omap_dss_device *dssdev)
{
sharp_ls_power_off(dssdev);
dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
}
static struct omap_dss_driver sharp_ls_driver = {
.probe = sharp_ls_panel_probe,
.remove = __exit_p(sharp_ls_panel_remove),
.enable = sharp_ls_panel_enable,
.disable = sharp_ls_panel_disable,
.driver = {
.name = "sharp_ls_panel",
.owner = THIS_MODULE,
},
};
static int __init sharp_ls_panel_drv_init(void)
{
return omap_dss_register_driver(&sharp_ls_driver);
}
static void __exit sharp_ls_panel_drv_exit(void)
{
omap_dss_unregister_driver(&sharp_ls_driver);
}
module_init(sharp_ls_panel_drv_init);
module_exit(sharp_ls_panel_drv_exit);
MODULE_LICENSE("GPL");
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