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 <linux/platform_data/spi-omap2-mcspi.h>
  18 #include <video/omapdss.h>
  19 #include "board-zoom.h"
  20
  21 #include "soc.h"
  22 #include "common.h"
  23
  24 #define LCD_PANEL_RESET_GPIO_PROD       96
  25 #define LCD_PANEL_RESET_GPIO_PILOT      55
  26 #define LCD_PANEL_QVGA_GPIO             56
  27
  28 static struct gpio zoom_lcd_gpios[] __initdata = {
  29         { -EINVAL,              GPIOF_OUT_INIT_HIGH, "lcd reset" },
  30         { LCD_PANEL_QVGA_GPIO,  GPIOF_OUT_INIT_HIGH, "lcd qvga"  },
  31 };
  32
  33 static void __init zoom_lcd_panel_init(void)
  34 {
  35         zoom_lcd_gpios[0].gpio = (omap_rev() > OMAP3430_REV_ES3_0) ?
  36                         LCD_PANEL_RESET_GPIO_PROD :
  37                         LCD_PANEL_RESET_GPIO_PILOT;
  38
  39         if (gpio_request_array(zoom_lcd_gpios, ARRAY_SIZE(zoom_lcd_gpios)))
  40                 pr_err("%s: Failed to get LCD GPIOs.\n", __func__);
  41 }
  42
  43 static int zoom_panel_enable_lcd(struct omap_dss_device *dssdev)
  44 {
  45         return 0;
  46 }
  47
  48 static void zoom_panel_disable_lcd(struct omap_dss_device *dssdev)
  49 {
  50 }
  51
  52 /* Register offsets in TWL4030_MODULE_INTBR */
  53 #define TWL_INTBR_PMBR1 0xD
  54 #define TWL_INTBR_GPBR1 0xC
  55
  56 /* Register offsets in TWL_MODULE_PWM */
  57 #define TWL_LED_PWMON   0x3
  58 #define TWL_LED_PWMOFF  0x4
  59
  60 static int zoom_set_bl_intensity(struct omap_dss_device *dssdev, int level)
  61 {
  62 #ifdef CONFIG_TWL4030_CORE
  63         unsigned char c;
  64         u8 mux_pwm, enb_pwm;
  65
  66         if (level > 100)
  67                 return -1;
  68
  69         twl_i2c_read_u8(TWL4030_MODULE_INTBR, &mux_pwm, TWL_INTBR_PMBR1);
  70         twl_i2c_read_u8(TWL4030_MODULE_INTBR, &enb_pwm, TWL_INTBR_GPBR1);
  71
  72         if (level == 0) {
  73                 /* disable pwm1 output and clock */
  74                 enb_pwm = enb_pwm & 0xF5;
  75                 /* change pwm1 pin to gpio pin */
  76                 mux_pwm = mux_pwm & 0xCF;
  77                 twl_i2c_write_u8(TWL4030_MODULE_INTBR,
  78                                         enb_pwm, TWL_INTBR_GPBR1);
  79                 twl_i2c_write_u8(TWL4030_MODULE_INTBR,
  80                                         mux_pwm, TWL_INTBR_PMBR1);
  81                 return 0;
  82         }
  83
  84         if (!((enb_pwm & 0xA) && (mux_pwm & 0x30))) {
  85                 /* change gpio pin to pwm1 pin */
  86                 mux_pwm = mux_pwm | 0x30;
  87                 /* enable pwm1 output and clock*/
  88                 enb_pwm = enb_pwm | 0x0A;
  89                 twl_i2c_write_u8(TWL4030_MODULE_INTBR,
  90                                         mux_pwm, TWL_INTBR_PMBR1);
  91                 twl_i2c_write_u8(TWL4030_MODULE_INTBR,
  92                                         enb_pwm, TWL_INTBR_GPBR1);
  93         }
  94
  95         c = ((50 * (100 - level)) / 100) + 1;
  96         twl_i2c_write_u8(TWL_MODULE_PWM, 0x7F, TWL_LED_PWMOFF);
  97         twl_i2c_write_u8(TWL_MODULE_PWM, c, TWL_LED_PWMON);
  98 #else
  99         pr_warn("Backlight not enabled\n");
 100 #endif
 101
 102         return 0;
 103 }
 104
 105 static struct omap_dss_device zoom_lcd_device = {
 106         .name                   = "lcd",
 107         .driver_name            = "NEC_8048_panel",
 108         .type                   = OMAP_DISPLAY_TYPE_DPI,
 109         .phy.dpi.data_lines     = 24,
 110         .platform_enable        = zoom_panel_enable_lcd,
 111         .platform_disable       = zoom_panel_disable_lcd,
 112         .max_backlight_level    = 100,
 113         .set_backlight          = zoom_set_bl_intensity,
 114 };
 115
 116 static struct omap_dss_device *zoom_dss_devices[] = {
 117         &zoom_lcd_device,
 118 };
 119
 120 static struct omap_dss_board_info zoom_dss_data = {
 121         .num_devices            = ARRAY_SIZE(zoom_dss_devices),
 122         .devices                = zoom_dss_devices,
 123         .default_device         = &zoom_lcd_device,
 124 };
 125
 126 static struct omap2_mcspi_device_config dss_lcd_mcspi_config = {
 127         .turbo_mode             = 1,
 128 };
 129
 130 static struct spi_board_info nec_8048_spi_board_info[] __initdata = {
 131         [0] = {
 132                 .modalias               = "nec_8048_spi",
 133                 .bus_num                = 1,
 134                 .chip_select            = 2,
 135                 .max_speed_hz           = 375000,
 136                 .controller_data        = &dss_lcd_mcspi_config,
 137         },
 138 };
 139
 140 void __init zoom_display_init(void)
 141 {
 142         omap_display_init(&zoom_dss_data);
 143         spi_register_board_info(nec_8048_spi_board_info,
 144                                 ARRAY_SIZE(nec_8048_spi_board_info));
 145         zoom_lcd_panel_init();
 146 }
 147