arch/arm/mach-omap2/board-zoom-display.c

   1 /*
   2  * Copyright (C) 2010 Texas Instruments Inc.
   3  *
   4  * Modified from mach-omap2/board-zoom-peripherals.c
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/init.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/gpio.h>
  15 #include <linux/i2c/twl.h>
  16 #include <linux/spi/spi.h>
  17 #include <plat/mcspi.h>
  18 #include <video/omapdss.h>
  19
  20 #define LCD_PANEL_RESET_GPIO_PROD       96
  21 #define LCD_PANEL_RESET_GPIO_PILOT      55
  22 #define LCD_PANEL_QVGA_GPIO             56
  23
  24 static struct gpio zoom_lcd_gpios[] __initdata = {
  25         { -EINVAL,              GPIOF_OUT_INIT_HIGH, "lcd reset" },
  26         { LCD_PANEL_QVGA_GPIO,  GPIOF_OUT_INIT_HIGH, "lcd qvga"  },
  27 };
  28
  29 static void __init zoom_lcd_panel_init(void)
  30 {
  31         zoom_lcd_gpios[0].gpio = (omap_rev() > OMAP3430_REV_ES3_0) ?
  32                         LCD_PANEL_RESET_GPIO_PROD :
  33                         LCD_PANEL_RESET_GPIO_PILOT;
  34
  35         if (gpio_request_array(zoom_lcd_gpios, ARRAY_SIZE(zoom_lcd_gpios)))
  36                 pr_err("%s: Failed to get LCD GPIOs.\n", __func__);
  37 }
  38
  39 static int zoom_panel_enable_lcd(struct omap_dss_device *dssdev)
  40 {
  41         return 0;
  42 }
  43
  44 static void zoom_panel_disable_lcd(struct omap_dss_device *dssdev)
  45 {
  46 }
  47
  48 /*
  49  * PWMA/B register offsets (TWL4030_MODULE_PWMA)
  50  */
  51 #define TWL_INTBR_PMBR1 0xD
  52 #define TWL_INTBR_GPBR1 0xC
  53 #define TWL_LED_PWMON   0x0
  54 #define TWL_LED_PWMOFF  0x1
  55
  56 static int zoom_set_bl_intensity(struct omap_dss_device *dssdev, int level)
  57 {
  58 #ifdef CONFIG_TWL4030_CORE
  59         unsigned char c;
  60         u8 mux_pwm, enb_pwm;
  61
  62         if (level > 100)
  63                 return -1;
  64
  65         twl_i2c_read_u8(TWL4030_MODULE_INTBR, &mux_pwm, TWL_INTBR_PMBR1);
  66         twl_i2c_read_u8(TWL4030_MODULE_INTBR, &enb_pwm, TWL_INTBR_GPBR1);
  67
  68         if (level == 0) {
  69                 /* disable pwm1 output and clock */
  70                 enb_pwm = enb_pwm & 0xF5;
  71                 /* change pwm1 pin to gpio pin */
  72                 mux_pwm = mux_pwm & 0xCF;
  73                 twl_i2c_write_u8(TWL4030_MODULE_INTBR,
  74                                         enb_pwm, TWL_INTBR_GPBR1);
  75                 twl_i2c_write_u8(TWL4030_MODULE_INTBR,
  76                                         mux_pwm, TWL_INTBR_PMBR1);
  77                 return 0;
  78         }
  79
  80         if (!((enb_pwm & 0xA) && (mux_pwm & 0x30))) {
  81                 /* change gpio pin to pwm1 pin */
  82                 mux_pwm = mux_pwm | 0x30;
  83                 /* enable pwm1 output and clock*/
  84                 enb_pwm = enb_pwm | 0x0A;
  85                 twl_i2c_write_u8(TWL4030_MODULE_INTBR,
  86                                         mux_pwm, TWL_INTBR_PMBR1);
  87                 twl_i2c_write_u8(TWL4030_MODULE_INTBR,
  88                                         enb_pwm, TWL_INTBR_GPBR1);
  89         }
  90
  91         c = ((50 * (100 - level)) / 100) + 1;
  92         twl_i2c_write_u8(TWL4030_MODULE_PWM1, 0x7F, TWL_LED_PWMOFF);
  93         twl_i2c_write_u8(TWL4030_MODULE_PWM1, c, TWL_LED_PWMON);
  94 #else
  95         pr_warn("Backlight not enabled\n");
  96 #endif
  97
  98         return 0;
  99 }
 100
 101 static struct omap_dss_device zoom_lcd_device = {
 102         .name                   = "lcd",
 103         .driver_name            = "NEC_8048_panel",
 104         .type                   = OMAP_DISPLAY_TYPE_DPI,
 105         .phy.dpi.data_lines     = 24,
 106         .platform_enable        = zoom_panel_enable_lcd,
 107         .platform_disable       = zoom_panel_disable_lcd,
 108         .max_backlight_level    = 100,
 109         .set_backlight          = zoom_set_bl_intensity,
 110 };
 111
 112 static struct omap_dss_device *zoom_dss_devices[] = {
 113         &zoom_lcd_device,
 114 };
 115
 116 static struct omap_dss_board_info zoom_dss_data = {
 117         .num_devices            = ARRAY_SIZE(zoom_dss_devices),
 118         .devices                = zoom_dss_devices,
 119         .default_device         = &zoom_lcd_device,
 120 };
 121
 122 static struct omap2_mcspi_device_config dss_lcd_mcspi_config = {
 123         .turbo_mode             = 1,
 124 };
 125
 126 static struct spi_board_info nec_8048_spi_board_info[] __initdata = {
 127         [0] = {
 128                 .modalias               = "nec_8048_spi",
 129                 .bus_num                = 1,
 130                 .chip_select            = 2,
 131                 .max_speed_hz           = 375000,
 132                 .controller_data        = &dss_lcd_mcspi_config,
 133         },
 134 };
 135
 136 void __init zoom_display_init(void)
 137 {
 138         omap_display_init(&zoom_dss_data);
 139         spi_register_board_info(nec_8048_spi_board_info,
 140                                 ARRAY_SIZE(nec_8048_spi_board_info));
 141         zoom_lcd_panel_init();
 142 }
 143