/*
 * LCD panel driver for LG.Philips LB035Q02
 *
 * Author: Steve Sakoman <steve@sakoman.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/spi/spi.h>
#include <linux/mutex.h>

#include <video/omapdss.h>

struct lb035q02_data {
        struct mutex lock;
};

static struct omap_video_timings lb035q02_timings = {
        .x_res = 320,
        .y_res = 240,

        .pixel_clock    = 6500,

        .hsw            = 2,
        .hfp            = 20,
        .hbp            = 68,

        .vsw            = 2,
        .vfp            = 4,
        .vbp            = 18,

        .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 lb035q02_panel_power_on(struct omap_dss_device *dssdev)
{
        int r;

        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;

        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 lb035q02_panel_power_off(struct omap_dss_device *dssdev)
{
        if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
                return;

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

        omapdss_dpi_display_disable(dssdev);
}

static int lb035q02_panel_probe(struct omap_dss_device *dssdev)
{
        struct lb035q02_data *ld;
        int r;

        dssdev->panel.timings = lb035q02_timings;

        ld = kzalloc(sizeof(*ld), GFP_KERNEL);
        if (!ld) {
                r = -ENOMEM;
                goto err;
        }
        mutex_init(&ld->lock);
        dev_set_drvdata(&dssdev->dev, ld);
        return 0;
err:
        return r;
}

static void lb035q02_panel_remove(struct omap_dss_device *dssdev)
{
        struct lb035q02_data *ld = dev_get_drvdata(&dssdev->dev);

        kfree(ld);
}

static int lb035q02_panel_enable(struct omap_dss_device *dssdev)
{
        struct lb035q02_data *ld = dev_get_drvdata(&dssdev->dev);
        int r;

        mutex_lock(&ld->lock);

        r = lb035q02_panel_power_on(dssdev);
        if (r)
                goto err;
        dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;

        mutex_unlock(&ld->lock);
        return 0;
err:
        mutex_unlock(&ld->lock);
        return r;
}

static void lb035q02_panel_disable(struct omap_dss_device *dssdev)
{
        struct lb035q02_data *ld = dev_get_drvdata(&dssdev->dev);

        mutex_lock(&ld->lock);

        lb035q02_panel_power_off(dssdev);
        dssdev->state = OMAP_DSS_DISPLAY_DISABLED;

        mutex_unlock(&ld->lock);
}

static int lb035q02_panel_suspend(struct omap_dss_device *dssdev)
{
        struct lb035q02_data *ld = dev_get_drvdata(&dssdev->dev);

        mutex_lock(&ld->lock);

        lb035q02_panel_power_off(dssdev);
        dssdev->state = OMAP_DSS_DISPLAY_SUSPENDED;

        mutex_unlock(&ld->lock);
        return 0;
}

static int lb035q02_panel_resume(struct omap_dss_device *dssdev)
{
        struct lb035q02_data *ld = dev_get_drvdata(&dssdev->dev);
        int r;

        mutex_lock(&ld->lock);

        r = lb035q02_panel_power_on(dssdev);
        if (r)
                goto err;
        dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;

        mutex_unlock(&ld->lock);
        return 0;
err:
        mutex_unlock(&ld->lock);
        return r;
}

static struct omap_dss_driver lb035q02_driver = {
        .probe          = lb035q02_panel_probe,
        .remove         = lb035q02_panel_remove,

        .enable         = lb035q02_panel_enable,
        .disable        = lb035q02_panel_disable,
        .suspend        = lb035q02_panel_suspend,
        .resume         = lb035q02_panel_resume,

        .driver         = {
                .name   = "lgphilips_lb035q02_panel",
                .owner  = THIS_MODULE,
        },
};

static int lb035q02_write_reg(struct spi_device *spi, u8 reg, u16 val)
{
        struct spi_message msg;
        struct spi_transfer index_xfer = {
                .len            = 3,
                .cs_change      = 1,
        };
        struct spi_transfer value_xfer = {
                .len            = 3,
        };
        u8      buffer[16];

        spi_message_init(&msg);

        /* register index */
        buffer[0] = 0x70;
        buffer[1] = 0x00;
        buffer[2] = reg & 0x7f;
        index_xfer.tx_buf = buffer;
        spi_message_add_tail(&index_xfer, &msg);

        /* register value */
        buffer[4] = 0x72;
        buffer[5] = val >> 8;
        buffer[6] = val;
        value_xfer.tx_buf = buffer + 4;
        spi_message_add_tail(&value_xfer, &msg);

        return spi_sync(spi, &msg);
}

static void init_lb035q02_panel(struct spi_device *spi)
{
        /* Init sequence from page 28 of the lb035q02 spec */
        lb035q02_write_reg(spi, 0x01, 0x6300);
        lb035q02_write_reg(spi, 0x02, 0x0200);
        lb035q02_write_reg(spi, 0x03, 0x0177);
        lb035q02_write_reg(spi, 0x04, 0x04c7);
        lb035q02_write_reg(spi, 0x05, 0xffc0);
        lb035q02_write_reg(spi, 0x06, 0xe806);
        lb035q02_write_reg(spi, 0x0a, 0x4008);
        lb035q02_write_reg(spi, 0x0b, 0x0000);
        lb035q02_write_reg(spi, 0x0d, 0x0030);
        lb035q02_write_reg(spi, 0x0e, 0x2800);
        lb035q02_write_reg(spi, 0x0f, 0x0000);
        lb035q02_write_reg(spi, 0x16, 0x9f80);
        lb035q02_write_reg(spi, 0x17, 0x0a0f);
        lb035q02_write_reg(spi, 0x1e, 0x00c1);
        lb035q02_write_reg(spi, 0x30, 0x0300);
        lb035q02_write_reg(spi, 0x31, 0x0007);
        lb035q02_write_reg(spi, 0x32, 0x0000);
        lb035q02_write_reg(spi, 0x33, 0x0000);
        lb035q02_write_reg(spi, 0x34, 0x0707);
        lb035q02_write_reg(spi, 0x35, 0x0004);
        lb035q02_write_reg(spi, 0x36, 0x0302);
        lb035q02_write_reg(spi, 0x37, 0x0202);
        lb035q02_write_reg(spi, 0x3a, 0x0a0d);
        lb035q02_write_reg(spi, 0x3b, 0x0806);
}

static int __devinit lb035q02_panel_spi_probe(struct spi_device *spi)
{
        init_lb035q02_panel(spi);
        return omap_dss_register_driver(&lb035q02_driver);
}

static int __devexit lb035q02_panel_spi_remove(struct spi_device *spi)
{
        omap_dss_unregister_driver(&lb035q02_driver);
        return 0;
}

static struct spi_driver lb035q02_spi_driver = {
        .driver         = {
                .name   = "lgphilips_lb035q02_panel-spi",
                .owner  = THIS_MODULE,
        },
        .probe          = lb035q02_panel_spi_probe,
        .remove         = __devexit_p(lb035q02_panel_spi_remove),
};

module_spi_driver(lb035q02_spi_driver);

MODULE_LICENSE("GPL");