panel-nec-nl8048hl11-01b.c

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/*
 * Support for NEC-nl8048hl11-01b panel driver
 *
 * Copyright (C) 2010 Texas Instruments Inc.
 * Author: Erik Gilling <[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/spi/spi.h>
#include <linux/backlight.h>
#include <linux/fb.h>

#include <video/omapdss.h>

#define LCD_XRES        800
#define LCD_YRES        480
/*
 * NEC PIX Clock Ratings
 * MIN:21.8MHz TYP:23.8MHz MAX:25.7MHz
 */
#define LCD_PIXEL_CLOCK     23800

struct nec_8048_data {
    struct backlight_device *bl;
};

static const struct {
    unsigned char addr;
    unsigned char dat;
} nec_8048_init_seq[] = {
    { 3, 0x01 }, { 0, 0x00 }, { 1, 0x01 }, { 4, 0x00 }, { 5, 0x14 },
    { 6, 0x24 }, { 16, 0xD7 }, { 17, 0x00 }, { 18, 0x00 }, { 19, 0x55 },
    { 20, 0x01 }, { 21, 0x70 }, { 22, 0x1E }, { 23, 0x25 }, { 24, 0x25 },
    { 25, 0x02 }, { 26, 0x02 }, { 27, 0xA0 }, { 32, 0x2F }, { 33, 0x0F },
    { 34, 0x0F }, { 35, 0x0F }, { 36, 0x0F }, { 37, 0x0F }, { 38, 0x0F },
    { 39, 0x00 }, { 40, 0x02 }, { 41, 0x02 }, { 42, 0x02 }, { 43, 0x0F },
    { 44, 0x0F }, { 45, 0x0F }, { 46, 0x0F }, { 47, 0x0F }, { 48, 0x0F },
    { 49, 0x0F }, { 50, 0x00 }, { 51, 0x02 }, { 52, 0x02 }, { 53, 0x02 },
    { 80, 0x0C }, { 83, 0x42 }, { 84, 0x42 }, { 85, 0x41 }, { 86, 0x14 },
    { 89, 0x88 }, { 90, 0x01 }, { 91, 0x00 }, { 92, 0x02 }, { 93, 0x0C },
    { 94, 0x1C }, { 95, 0x27 }, { 98, 0x49 }, { 99, 0x27 }, { 102, 0x76 },
    { 103, 0x27 }, { 112, 0x01 }, { 113, 0x0E }, { 114, 0x02 },
    { 115, 0x0C }, { 118, 0x0C }, { 121, 0x30 }, { 130, 0x00 },
    { 131, 0x00 }, { 132, 0xFC }, { 134, 0x00 }, { 136, 0x00 },
    { 138, 0x00 }, { 139, 0x00 }, { 140, 0x00 }, { 141, 0xFC },
    { 143, 0x00 }, { 145, 0x00 }, { 147, 0x00 }, { 148, 0x00 },
    { 149, 0x00 }, { 150, 0xFC }, { 152, 0x00 }, { 154, 0x00 },
    { 156, 0x00 }, { 157, 0x00 }, { 2, 0x00 },
};

/*
 * NEC NL8048HL11-01B  Manual
 * defines HFB, HSW, HBP, VFP, VSW, VBP as shown below
 */

static struct omap_video_timings nec_8048_panel_timings = {
    /* 800 x 480 @ 60 Hz  Reduced blanking VESA CVT 0.31M3-R */
    .x_res      = LCD_XRES,
    .y_res      = LCD_YRES,
    .pixel_clock    = LCD_PIXEL_CLOCK,
    .hfp        = 6,
    .hsw        = 1,
    .hbp        = 4,
    .vfp        = 3,
    .vsw        = 1,
    .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_RISING_EDGE,
};

static int nec_8048_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 nec_8048_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 nec_8048_bl_ops = {
    .get_brightness = nec_8048_bl_get_brightness,
    .update_status  = nec_8048_bl_update_status,
};

static int nec_8048_panel_probe(struct omap_dss_device *dssdev)
{
    struct backlight_device *bl;
    struct nec_8048_data *necd;
    struct backlight_properties props;
    int r;

    dssdev->panel.timings = nec_8048_panel_timings;

    necd = kzalloc(sizeof(*necd), GFP_KERNEL);
    if (!necd)
        return -ENOMEM;

    dev_set_drvdata(&dssdev->dev, necd);

    memset(&props, 0, sizeof(struct backlight_properties));
    props.max_brightness = 255;

    bl = backlight_device_register("nec-8048", &dssdev->dev, dssdev,
            &nec_8048_bl_ops, &props);
    if (IS_ERR(bl)) {
        r = PTR_ERR(bl);
        kfree(necd);
        return r;
    }
    necd->bl = bl;

    bl->props.fb_blank = FB_BLANK_UNBLANK;
    bl->props.power = FB_BLANK_UNBLANK;
    bl->props.max_brightness = dssdev->max_backlight_level;
    bl->props.brightness = dssdev->max_backlight_level;

    r = nec_8048_bl_update_status(bl);
    if (r < 0)
        dev_err(&dssdev->dev, "failed to set lcd brightness\n");

    return 0;
}

static void nec_8048_panel_remove(struct omap_dss_device *dssdev)
{
    struct nec_8048_data *necd = dev_get_drvdata(&dssdev->dev);
    struct backlight_device *bl = necd->bl;

    bl->props.power = FB_BLANK_POWERDOWN;
    nec_8048_bl_update_status(bl);
    backlight_device_unregister(bl);

    kfree(necd);
}

static int nec_8048_panel_power_on(struct omap_dss_device *dssdev)
{
    int r;
    struct nec_8048_data *necd = dev_get_drvdata(&dssdev->dev);
    struct backlight_device *bl = necd->bl;

    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;
    }

    r = nec_8048_bl_update_status(bl);
    if (r < 0)
        dev_err(&dssdev->dev, "failed to set lcd brightness\n");

    return 0;
err1:
    omapdss_dpi_display_disable(dssdev);
err0:
    return r;
}

static void nec_8048_panel_power_off(struct omap_dss_device *dssdev)
{
    struct nec_8048_data *necd = dev_get_drvdata(&dssdev->dev);
    struct backlight_device *bl = necd->bl;

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

    bl->props.brightness = 0;
    nec_8048_bl_update_status(bl);

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

    omapdss_dpi_display_disable(dssdev);
}

static int nec_8048_panel_enable(struct omap_dss_device *dssdev)
{
    int r;

    r = nec_8048_panel_power_on(dssdev);
    if (r)
        return r;

    dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;

    return 0;
}

static void nec_8048_panel_disable(struct omap_dss_device *dssdev)
{
    nec_8048_panel_power_off(dssdev);

    dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
}

static int nec_8048_panel_suspend(struct omap_dss_device *dssdev)
{
    nec_8048_panel_power_off(dssdev);

    dssdev->state = OMAP_DSS_DISPLAY_SUSPENDED;

    return 0;
}

static int nec_8048_panel_resume(struct omap_dss_device *dssdev)
{
    int r;

    r = nec_8048_panel_power_on(dssdev);
    if (r)
        return r;

    dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;

    return 0;
}

static int nec_8048_recommended_bpp(struct omap_dss_device *dssdev)
{
    return 16;
}

static struct omap_dss_driver nec_8048_driver = {
    .probe          = nec_8048_panel_probe,
    .remove         = nec_8048_panel_remove,
    .enable         = nec_8048_panel_enable,
    .disable        = nec_8048_panel_disable,
    .suspend        = nec_8048_panel_suspend,
    .resume         = nec_8048_panel_resume,
    .get_recommended_bpp    = nec_8048_recommended_bpp,

    .driver     = {
        .name       = "NEC_8048_panel",
        .owner      = THIS_MODULE,
    },
};

static int nec_8048_spi_send(struct spi_device *spi, unsigned char reg_addr,
            unsigned char reg_data)
{
    int ret = 0;
    unsigned int cmd = 0, data = 0;

    cmd = 0x0000 | reg_addr; /* register address write */
    data = 0x0100 | reg_data ; /* register data write */
    data = (cmd << 16) | data;

    ret = spi_write(spi, (unsigned char *)&data, 4);
    if (ret)
        pr_err("error in spi_write %x\n", data);

    return ret;
}

static int init_nec_8048_wvga_lcd(struct spi_device *spi)
{
    unsigned int i;
    /* Initialization Sequence */
    /* nec_8048_spi_send(spi, REG, VAL) */
    for (i = 0; i < (ARRAY_SIZE(nec_8048_init_seq) - 1); i++)
        nec_8048_spi_send(spi, nec_8048_init_seq[i].addr,
                nec_8048_init_seq[i].dat);
    udelay(20);
    nec_8048_spi_send(spi, nec_8048_init_seq[i].addr,
                nec_8048_init_seq[i].dat);
    return 0;
}

static int nec_8048_spi_probe(struct spi_device *spi)
{
    spi->mode = SPI_MODE_0;
    spi->bits_per_word = 32;
    spi_setup(spi);

    init_nec_8048_wvga_lcd(spi);

    return omap_dss_register_driver(&nec_8048_driver);
}

static int nec_8048_spi_remove(struct spi_device *spi)
{
    omap_dss_unregister_driver(&nec_8048_driver);

    return 0;
}

static int nec_8048_spi_suspend(struct spi_device *spi, pm_message_t mesg)
{
    nec_8048_spi_send(spi, 2, 0x01);
    mdelay(40);

    return 0;
}

static int nec_8048_spi_resume(struct spi_device *spi)
{
    /* reinitialize the panel */
    spi_setup(spi);
    nec_8048_spi_send(spi, 2, 0x00);
    init_nec_8048_wvga_lcd(spi);

    return 0;
}

static struct spi_driver nec_8048_spi_driver = {
    .probe      = nec_8048_spi_probe,
    .remove     = __devexit_p(nec_8048_spi_remove),
    .suspend    = nec_8048_spi_suspend,
    .resume     = nec_8048_spi_resume,
    .driver     = {
        .name   = "nec_8048_spi",
        .owner  = THIS_MODULE,
    },
};

module_spi_driver(nec_8048_spi_driver);

MODULE_AUTHOR("Erik Gilling <[email protected]>");
MODULE_DESCRIPTION("NEC-nl8048hl11-01b Driver");
MODULE_LICENSE("GPL");