board-zoom-display.c

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/*
 * Copyright (C) 2010 Texas Instruments Inc.
 *
 * Modified from mach-omap2/board-zoom-peripherals.c
 *
 * 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.
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/i2c/twl.h>
#include <linux/spi/spi.h>
#include <linux/platform_data/spi-omap2-mcspi.h>
#include <video/omapdss.h>
#include <mach/board-zoom.h>

#include "common.h"

#define LCD_PANEL_RESET_GPIO_PROD   96
#define LCD_PANEL_RESET_GPIO_PILOT  55
#define LCD_PANEL_QVGA_GPIO     56

static struct gpio zoom_lcd_gpios[] __initdata = {
    { -EINVAL,      GPIOF_OUT_INIT_HIGH, "lcd reset" },
    { LCD_PANEL_QVGA_GPIO,  GPIOF_OUT_INIT_HIGH, "lcd qvga"  },
};

static void __init zoom_lcd_panel_init(void)
{
    zoom_lcd_gpios[0].gpio = (omap_rev() > OMAP3430_REV_ES3_0) ?
            LCD_PANEL_RESET_GPIO_PROD :
            LCD_PANEL_RESET_GPIO_PILOT;

    if (gpio_request_array(zoom_lcd_gpios, ARRAY_SIZE(zoom_lcd_gpios)))
        pr_err("%s: Failed to get LCD GPIOs.\n", __func__);
}

static int zoom_panel_enable_lcd(struct omap_dss_device *dssdev)
{
    return 0;
}

static void zoom_panel_disable_lcd(struct omap_dss_device *dssdev)
{
}

/*
 * PWMA/B register offsets (TWL4030_MODULE_PWMA)
 */
#define TWL_INTBR_PMBR1 0xD
#define TWL_INTBR_GPBR1 0xC
#define TWL_LED_PWMON   0x0
#define TWL_LED_PWMOFF  0x1

static int zoom_set_bl_intensity(struct omap_dss_device *dssdev, int level)
{
#ifdef CONFIG_TWL4030_CORE
    unsigned char c;
    u8 mux_pwm, enb_pwm;

    if (level > 100)
        return -1;

    twl_i2c_read_u8(TWL4030_MODULE_INTBR, &mux_pwm, TWL_INTBR_PMBR1);
    twl_i2c_read_u8(TWL4030_MODULE_INTBR, &enb_pwm, TWL_INTBR_GPBR1);

    if (level == 0) {
        /* disable pwm1 output and clock */
        enb_pwm = enb_pwm & 0xF5;
        /* change pwm1 pin to gpio pin */
        mux_pwm = mux_pwm & 0xCF;
        twl_i2c_write_u8(TWL4030_MODULE_INTBR,
                    enb_pwm, TWL_INTBR_GPBR1);
        twl_i2c_write_u8(TWL4030_MODULE_INTBR,
                    mux_pwm, TWL_INTBR_PMBR1);
        return 0;
    }

    if (!((enb_pwm & 0xA) && (mux_pwm & 0x30))) {
        /* change gpio pin to pwm1 pin */
        mux_pwm = mux_pwm | 0x30;
        /* enable pwm1 output and clock*/
        enb_pwm = enb_pwm | 0x0A;
        twl_i2c_write_u8(TWL4030_MODULE_INTBR,
                    mux_pwm, TWL_INTBR_PMBR1);
        twl_i2c_write_u8(TWL4030_MODULE_INTBR,
                    enb_pwm, TWL_INTBR_GPBR1);
    }

    c = ((50 * (100 - level)) / 100) + 1;
    twl_i2c_write_u8(TWL4030_MODULE_PWM1, 0x7F, TWL_LED_PWMOFF);
    twl_i2c_write_u8(TWL4030_MODULE_PWM1, c, TWL_LED_PWMON);
#else
    pr_warn("Backlight not enabled\n");
#endif

    return 0;
}

static struct omap_dss_device zoom_lcd_device = {
    .name           = "lcd",
    .driver_name        = "NEC_8048_panel",
    .type           = OMAP_DISPLAY_TYPE_DPI,
    .phy.dpi.data_lines = 24,
    .platform_enable    = zoom_panel_enable_lcd,
    .platform_disable   = zoom_panel_disable_lcd,
    .max_backlight_level    = 100,
    .set_backlight      = zoom_set_bl_intensity,
};

static struct omap_dss_device *zoom_dss_devices[] = {
    &zoom_lcd_device,
};

static struct omap_dss_board_info zoom_dss_data = {
    .num_devices        = ARRAY_SIZE(zoom_dss_devices),
    .devices        = zoom_dss_devices,
    .default_device     = &zoom_lcd_device,
};

static struct omap2_mcspi_device_config dss_lcd_mcspi_config = {
    .turbo_mode     = 1,
};

static struct spi_board_info nec_8048_spi_board_info[] __initdata = {
    [0] = {
        .modalias       = "nec_8048_spi",
        .bus_num        = 1,
        .chip_select        = 2,
        .max_speed_hz       = 375000,
        .controller_data    = &dss_lcd_mcspi_config,
    },
};

void __init zoom_display_init(void)
{
    omap_display_init(&zoom_dss_data);
    spi_register_board_info(nec_8048_spi_board_info,
                ARRAY_SIZE(nec_8048_spi_board_info));
    zoom_lcd_panel_init();
}