panel-sharp-ls037v7dw01.c

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/*
 * LCD panel driver for Sharp LS037V7DW01
 *
 * Copyright (C) 2008 Nokia Corporation
 * Author: Tomi Valkeinen <[email protected]>
 *
 * 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 int sharp_ls_panel_suspend(struct omap_dss_device *dssdev)
{
    sharp_ls_power_off(dssdev);
    dssdev->state = OMAP_DSS_DISPLAY_SUSPENDED;
    return 0;
}

static int sharp_ls_panel_resume(struct omap_dss_device *dssdev)
{
    int r;
    r = sharp_ls_power_on(dssdev);
    dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
    return r;
}

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,
    .suspend    = sharp_ls_panel_suspend,
    .resume     = sharp_ls_panel_resume,

    .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");