lcd_ams_delta.c

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/*
 * Based on drivers/video/omap/lcd_inn1510.c
 *
 * LCD panel support for the Amstrad E3 (Delta) videophone.
 *
 * Copyright (C) 2006 Jonathan McDowell <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * 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, write to the Free Software Foundation, Inc.,
 * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/lcd.h>
#include <linux/gpio.h>

#include <mach/board-ams-delta.h>

#include "omapfb.h"

#define AMS_DELTA_DEFAULT_CONTRAST  112

#define AMS_DELTA_MAX_CONTRAST      0x00FF
#define AMS_DELTA_LCD_POWER     0x0100


/* LCD class device section */

static int ams_delta_lcd;

static int ams_delta_lcd_set_power(struct lcd_device *dev, int power)
{
    if (power == FB_BLANK_UNBLANK) {
        if (!(ams_delta_lcd & AMS_DELTA_LCD_POWER)) {
            omap_writeb(ams_delta_lcd & AMS_DELTA_MAX_CONTRAST,
                    OMAP_PWL_ENABLE);
            omap_writeb(1, OMAP_PWL_CLK_ENABLE);
            ams_delta_lcd |= AMS_DELTA_LCD_POWER;
        }
    } else {
        if (ams_delta_lcd & AMS_DELTA_LCD_POWER) {
            omap_writeb(0, OMAP_PWL_ENABLE);
            omap_writeb(0, OMAP_PWL_CLK_ENABLE);
            ams_delta_lcd &= ~AMS_DELTA_LCD_POWER;
        }
    }
    return 0;
}

static int ams_delta_lcd_set_contrast(struct lcd_device *dev, int value)
{
    if ((value >= 0) && (value <= AMS_DELTA_MAX_CONTRAST)) {
        omap_writeb(value, OMAP_PWL_ENABLE);
        ams_delta_lcd &= ~AMS_DELTA_MAX_CONTRAST;
        ams_delta_lcd |= value;
    }
    return 0;
}

#ifdef CONFIG_LCD_CLASS_DEVICE
static int ams_delta_lcd_get_power(struct lcd_device *dev)
{
    if (ams_delta_lcd & AMS_DELTA_LCD_POWER)
        return FB_BLANK_UNBLANK;
    else
        return FB_BLANK_POWERDOWN;
}

static int ams_delta_lcd_get_contrast(struct lcd_device *dev)
{
    if (!(ams_delta_lcd & AMS_DELTA_LCD_POWER))
        return 0;

    return ams_delta_lcd & AMS_DELTA_MAX_CONTRAST;
}

static struct lcd_ops ams_delta_lcd_ops = {
    .get_power = ams_delta_lcd_get_power,
    .set_power = ams_delta_lcd_set_power,
    .get_contrast = ams_delta_lcd_get_contrast,
    .set_contrast = ams_delta_lcd_set_contrast,
};
#endif


/* omapfb panel section */

static const struct gpio _gpios[] = {
    {
        .gpio   = AMS_DELTA_GPIO_PIN_LCD_VBLEN,
        .flags  = GPIOF_OUT_INIT_LOW,
        .label  = "lcd_vblen",
    },
    {
        .gpio   = AMS_DELTA_GPIO_PIN_LCD_NDISP,
        .flags  = GPIOF_OUT_INIT_LOW,
        .label  = "lcd_ndisp",
    },
};

static int ams_delta_panel_init(struct lcd_panel *panel,
        struct omapfb_device *fbdev)
{
    return gpio_request_array(_gpios, ARRAY_SIZE(_gpios));
}

static void ams_delta_panel_cleanup(struct lcd_panel *panel)
{
    gpio_free_array(_gpios, ARRAY_SIZE(_gpios));
}

static int ams_delta_panel_enable(struct lcd_panel *panel)
{
    gpio_set_value(AMS_DELTA_GPIO_PIN_LCD_NDISP, 1);
    gpio_set_value(AMS_DELTA_GPIO_PIN_LCD_VBLEN, 1);
    return 0;
}

static void ams_delta_panel_disable(struct lcd_panel *panel)
{
    gpio_set_value(AMS_DELTA_GPIO_PIN_LCD_VBLEN, 0);
    gpio_set_value(AMS_DELTA_GPIO_PIN_LCD_NDISP, 0);
}

static unsigned long ams_delta_panel_get_caps(struct lcd_panel *panel)
{
    return 0;
}

static struct lcd_panel ams_delta_panel = {
    .name       = "ams-delta",
    .config     = 0,

    .bpp        = 12,
    .data_lines = 16,
    .x_res      = 480,
    .y_res      = 320,
    .pixel_clock    = 4687,
    .hsw        = 3,
    .hfp        = 1,
    .hbp        = 1,
    .vsw        = 1,
    .vfp        = 0,
    .vbp        = 0,
    .pcd        = 0,
    .acb        = 37,

    .init       = ams_delta_panel_init,
    .cleanup    = ams_delta_panel_cleanup,
    .enable     = ams_delta_panel_enable,
    .disable    = ams_delta_panel_disable,
    .get_caps   = ams_delta_panel_get_caps,
};


/* platform driver section */

static int ams_delta_panel_probe(struct platform_device *pdev)
{
    struct lcd_device *lcd_device = NULL;
#ifdef CONFIG_LCD_CLASS_DEVICE
    int ret;

    lcd_device = lcd_device_register("omapfb", &pdev->dev, NULL,
                        &ams_delta_lcd_ops);

    if (IS_ERR(lcd_device)) {
        ret = PTR_ERR(lcd_device);
        dev_err(&pdev->dev, "failed to register device\n");
        return ret;
    }

    platform_set_drvdata(pdev, lcd_device);
    lcd_device->props.max_contrast = AMS_DELTA_MAX_CONTRAST;
#endif

    ams_delta_lcd_set_contrast(lcd_device, AMS_DELTA_DEFAULT_CONTRAST);
    ams_delta_lcd_set_power(lcd_device, FB_BLANK_UNBLANK);

    omapfb_register_panel(&ams_delta_panel);
    return 0;
}

static int ams_delta_panel_remove(struct platform_device *pdev)
{
    return 0;
}

static int ams_delta_panel_suspend(struct platform_device *pdev,
        pm_message_t mesg)
{
    return 0;
}

static int ams_delta_panel_resume(struct platform_device *pdev)
{
    return 0;
}

static struct platform_driver ams_delta_panel_driver = {
    .probe      = ams_delta_panel_probe,
    .remove     = ams_delta_panel_remove,
    .suspend    = ams_delta_panel_suspend,
    .resume     = ams_delta_panel_resume,
    .driver     = {
        .name   = "lcd_ams_delta",
        .owner  = THIS_MODULE,
    },
};

module_platform_driver(ams_delta_panel_driver);