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board-zoom-display.c

/*
 * 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 <plat/mcspi.h>
#include <plat/display.h>

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

static void zoom_lcd_panel_init(void)
{
      int ret;
      unsigned char lcd_panel_reset_gpio;

      lcd_panel_reset_gpio = (omap_rev() > OMAP3430_REV_ES3_0) ?
                  LCD_PANEL_RESET_GPIO_PROD :
                  LCD_PANEL_RESET_GPIO_PILOT;

      ret = gpio_request(lcd_panel_reset_gpio, "lcd reset");
      if (ret) {
            pr_err("Failed to get LCD reset GPIO (gpio%d).\n",
                  lcd_panel_reset_gpio);
            return;
      }
      gpio_direction_output(lcd_panel_reset_gpio, 1);

      ret = gpio_request(LCD_PANEL_QVGA_GPIO, "lcd qvga");
      if (ret) {
            pr_err("Failed to get LCD_PANEL_QVGA_GPIO (gpio%d).\n",
                  LCD_PANEL_QVGA_GPIO);
            goto err0;
      }
      gpio_direction_output(LCD_PANEL_QVGA_GPIO, 1);

      return;
err0:
      gpio_free(lcd_panel_reset_gpio);
}

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)
{
      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);

      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 platform_device zoom_dss_device = {
      .name                   = "omapdss",
      .id                     = -1,
      .dev                    = {
            .platform_data          = &zoom_dss_data,
      },
};

static struct omap2_mcspi_device_config dss_lcd_mcspi_config = {
      .turbo_mode       = 1,
      .single_channel   = 1,  /* 0: slave, 1: master */
};

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,
      },
};

static struct platform_device *zoom_display_devices[] __initdata = {
      &zoom_dss_device,
};

void __init zoom_display_init(void)
{
      platform_add_devices(zoom_display_devices,
                        ARRAY_SIZE(zoom_display_devices));
      spi_register_board_info(nec_8048_spi_board_info,
                        ARRAY_SIZE(nec_8048_spi_board_info));
      zoom_lcd_panel_init();
}


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