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         unsigned char c;
  59         u8 mux_pwm, enb_pwm;
  60
  61         if (level > 100)
  62                 return -1;
  63
  64         twl_i2c_read_u8(TWL4030_MODULE_INTBR, &mux_pwm, TWL_INTBR_PMBR1);
  65         twl_i2c_read_u8(TWL4030_MODULE_INTBR, &enb_pwm, TWL_INTBR_GPBR1);
  66
  67         if (level == 0) {
  68                 /* disable pwm1 output and clock */
  69                 enb_pwm = enb_pwm & 0xF5;
  70                 /* change pwm1 pin to gpio pin */
  71                 mux_pwm = mux_pwm & 0xCF;
  72                 twl_i2c_write_u8(TWL4030_MODULE_INTBR,
  73                                         enb_pwm, TWL_INTBR_GPBR1);
  74                 twl_i2c_write_u8(TWL4030_MODULE_INTBR,
  75                                         mux_pwm, TWL_INTBR_PMBR1);
  76                 return 0;
  77         }
  78
  79         if (!((enb_pwm & 0xA) && (mux_pwm & 0x30))) {
  80                 /* change gpio pin to pwm1 pin */
  81                 mux_pwm = mux_pwm | 0x30;
  82                 /* enable pwm1 output and clock*/
  83                 enb_pwm = enb_pwm | 0x0A;
  84                 twl_i2c_write_u8(TWL4030_MODULE_INTBR,
  85                                         mux_pwm, TWL_INTBR_PMBR1);
  86                 twl_i2c_write_u8(TWL4030_MODULE_INTBR,
  87                                         enb_pwm, TWL_INTBR_GPBR1);
  88         }
  89
  90         c = ((50 * (100 - level)) / 100) + 1;
  91         twl_i2c_write_u8(TWL4030_MODULE_PWM1, 0x7F, TWL_LED_PWMOFF);
  92         twl_i2c_write_u8(TWL4030_MODULE_PWM1, c, TWL_LED_PWMON);
  93
  94         return 0;
  95 }
  96
  97 static struct omap_dss_device zoom_lcd_device = {
  98         .name                   = "lcd",
  99         .driver_name            = "NEC_8048_panel",
 100         .type                   = OMAP_DISPLAY_TYPE_DPI,
 101         .phy.dpi.data_lines     = 24,
 102         .platform_enable        = zoom_panel_enable_lcd,
 103         .platform_disable       = zoom_panel_disable_lcd,
 104         .max_backlight_level    = 100,
 105         .set_backlight          = zoom_set_bl_intensity,
 106 };
 107
 108 static struct omap_dss_device *zoom_dss_devices[] = {
 109         &zoom_lcd_device,
 110 };
 111
 112 static struct omap_dss_board_info zoom_dss_data = {
 113         .num_devices            = ARRAY_SIZE(zoom_dss_devices),
 114         .devices                = zoom_dss_devices,
 115         .default_device         = &zoom_lcd_device,
 116 };
 117
 118 static struct omap2_mcspi_device_config dss_lcd_mcspi_config = {
 119         .turbo_mode             = 1,
 120         .single_channel = 1,  /* 0: slave, 1: master */
 121 };
 122
 123 static struct spi_board_info nec_8048_spi_board_info[] __initdata = {
 124         [0] = {
 125                 .modalias               = "nec_8048_spi",
 126                 .bus_num                = 1,
 127                 .chip_select            = 2,
 128                 .max_speed_hz           = 375000,
 129                 .controller_data        = &dss_lcd_mcspi_config,
 130         },
 131 };
 132
 133 void __init zoom_display_init(void)
 134 {
 135         omap_display_init(&zoom_dss_data);
 136         spi_register_board_info(nec_8048_spi_board_info,
 137                                 ARRAY_SIZE(nec_8048_spi_board_info));
 138         zoom_lcd_panel_init();
 139 }
 140