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 #include <mach/board-zoom.h>
  20
  21 #define LCD_PANEL_RESET_GPIO_PROD       96
  22 #define LCD_PANEL_RESET_GPIO_PILOT      55
  23 #define LCD_PANEL_QVGA_GPIO             56
  24
  25 static struct gpio zoom_lcd_gpios[] __initdata = {
  26         { -EINVAL,              GPIOF_OUT_INIT_HIGH, "lcd reset" },
  27         { LCD_PANEL_QVGA_GPIO,  GPIOF_OUT_INIT_HIGH, "lcd qvga"  },
  28 };
  29
  30 static void __init zoom_lcd_panel_init(void)
  31 {
  32         zoom_lcd_gpios[0].gpio = (omap_rev() > OMAP3430_REV_ES3_0) ?
  33                         LCD_PANEL_RESET_GPIO_PROD :
  34                         LCD_PANEL_RESET_GPIO_PILOT;
  35
  36         if (gpio_request_array(zoom_lcd_gpios, ARRAY_SIZE(zoom_lcd_gpios)))
  37                 pr_err("%s: Failed to get LCD GPIOs.\n", __func__);
  38 }
  39
  40 static int zoom_panel_enable_lcd(struct omap_dss_device *dssdev)
  41 {
  42         return 0;
  43 }
  44
  45 static void zoom_panel_disable_lcd(struct omap_dss_device *dssdev)
  46 {
  47 }
  48
  49 /*
  50  * PWMA/B register offsets (TWL4030_MODULE_PWMA)
  51  */
  52 #define TWL_INTBR_PMBR1 0xD
  53 #define TWL_INTBR_GPBR1 0xC
  54 #define TWL_LED_PWMON   0x0
  55 #define TWL_LED_PWMOFF  0x1
  56
  57 static int zoom_set_bl_intensity(struct omap_dss_device *dssdev, int level)
  58 {
  59 #ifdef CONFIG_TWL4030_CORE
  60         unsigned char c;
  61         u8 mux_pwm, enb_pwm;
  62
  63         if (level > 100)
  64                 return -1;
  65
  66         twl_i2c_read_u8(TWL4030_MODULE_INTBR, &mux_pwm, TWL_INTBR_PMBR1);
  67         twl_i2c_read_u8(TWL4030_MODULE_INTBR, &enb_pwm, TWL_INTBR_GPBR1);
  68
  69         if (level == 0) {
  70                 /* disable pwm1 output and clock */
  71                 enb_pwm = enb_pwm & 0xF5;
  72                 /* change pwm1 pin to gpio pin */
  73                 mux_pwm = mux_pwm & 0xCF;
  74                 twl_i2c_write_u8(TWL4030_MODULE_INTBR,
  75                                         enb_pwm, TWL_INTBR_GPBR1);
  76                 twl_i2c_write_u8(TWL4030_MODULE_INTBR,
  77                                         mux_pwm, TWL_INTBR_PMBR1);
  78                 return 0;
  79         }
  80
  81         if (!((enb_pwm & 0xA) && (mux_pwm & 0x30))) {
  82                 /* change gpio pin to pwm1 pin */
  83                 mux_pwm = mux_pwm | 0x30;
  84                 /* enable pwm1 output and clock*/
  85                 enb_pwm = enb_pwm | 0x0A;
  86                 twl_i2c_write_u8(TWL4030_MODULE_INTBR,
  87                                         mux_pwm, TWL_INTBR_PMBR1);
  88                 twl_i2c_write_u8(TWL4030_MODULE_INTBR,
  89                                         enb_pwm, TWL_INTBR_GPBR1);
  90         }
  91
  92         c = ((50 * (100 - level)) / 100) + 1;
  93         twl_i2c_write_u8(TWL4030_MODULE_PWM1, 0x7F, TWL_LED_PWMOFF);
  94         twl_i2c_write_u8(TWL4030_MODULE_PWM1, c, TWL_LED_PWMON);
  95 #else
  96         pr_warn("Backlight not enabled\n");
  97 #endif
  98
  99         return 0;
 100 }
 101
 102 static struct omap_dss_device zoom_lcd_device = {
 103         .name                   = "lcd",
 104         .driver_name            = "NEC_8048_panel",
 105         .type                   = OMAP_DISPLAY_TYPE_DPI,
 106         .phy.dpi.data_lines     = 24,
 107         .platform_enable        = zoom_panel_enable_lcd,
 108         .platform_disable       = zoom_panel_disable_lcd,
 109         .max_backlight_level    = 100,
 110         .set_backlight          = zoom_set_bl_intensity,
 111 };
 112
 113 static struct omap_dss_device *zoom_dss_devices[] = {
 114         &zoom_lcd_device,
 115 };
 116
 117 static struct omap_dss_board_info zoom_dss_data = {
 118         .num_devices            = ARRAY_SIZE(zoom_dss_devices),
 119         .devices                = zoom_dss_devices,
 120         .default_device         = &zoom_lcd_device,
 121 };
 122
 123 static struct omap2_mcspi_device_config dss_lcd_mcspi_config = {
 124         .turbo_mode             = 1,
 125 };
 126
 127 static struct spi_board_info nec_8048_spi_board_info[] __initdata = {
 128         [0] = {
 129                 .modalias               = "nec_8048_spi",
 130                 .bus_num                = 1,
 131                 .chip_select            = 2,
 132                 .max_speed_hz           = 375000,
 133                 .controller_data        = &dss_lcd_mcspi_config,
 134         },
 135 };
 136
 137 void __init zoom_display_init(void)
 138 {
 139         omap_display_init(&zoom_dss_data);
 140         spi_register_board_info(nec_8048_spi_board_info,
 141                                 ARRAY_SIZE(nec_8048_spi_board_info));
 142         zoom_lcd_panel_init();
 143 }
 144