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 "common.h"
  22
  23 #define LCD_PANEL_RESET_GPIO_PROD       96
  24 #define LCD_PANEL_RESET_GPIO_PILOT      55
  25 #define LCD_PANEL_QVGA_GPIO             56
  26
  27 static struct gpio zoom_lcd_gpios[] __initdata = {
  28         { -EINVAL,              GPIOF_OUT_INIT_HIGH, "lcd reset" },
  29         { LCD_PANEL_QVGA_GPIO,  GPIOF_OUT_INIT_HIGH, "lcd qvga"  },
  30 };
  31
  32 static void __init zoom_lcd_panel_init(void)
  33 {
  34         zoom_lcd_gpios[0].gpio = (omap_rev() > OMAP3430_REV_ES3_0) ?
  35                         LCD_PANEL_RESET_GPIO_PROD :
  36                         LCD_PANEL_RESET_GPIO_PILOT;
  37
  38         if (gpio_request_array(zoom_lcd_gpios, ARRAY_SIZE(zoom_lcd_gpios)))
  39                 pr_err("%s: Failed to get LCD GPIOs.\n", __func__);
  40 }
  41
  42 static int zoom_panel_enable_lcd(struct omap_dss_device *dssdev)
  43 {
  44         return 0;
  45 }
  46
  47 static void zoom_panel_disable_lcd(struct omap_dss_device *dssdev)
  48 {
  49 }
  50
  51 /*
  52  * PWMA/B register offsets (TWL4030_MODULE_PWMA)
  53  */
  54 #define TWL_INTBR_PMBR1 0xD
  55 #define TWL_INTBR_GPBR1 0xC
  56 #define TWL_LED_PWMON   0x0
  57 #define TWL_LED_PWMOFF  0x1
  58
  59 static int zoom_set_bl_intensity(struct omap_dss_device *dssdev, int level)
  60 {
  61 #ifdef CONFIG_TWL4030_CORE
  62         unsigned char c;
  63         u8 mux_pwm, enb_pwm;
  64
  65         if (level > 100)
  66                 return -1;
  67
  68         twl_i2c_read_u8(TWL4030_MODULE_INTBR, &mux_pwm, TWL_INTBR_PMBR1);
  69         twl_i2c_read_u8(TWL4030_MODULE_INTBR, &enb_pwm, TWL_INTBR_GPBR1);
  70
  71         if (level == 0) {
  72                 /* disable pwm1 output and clock */
  73                 enb_pwm = enb_pwm & 0xF5;
  74                 /* change pwm1 pin to gpio pin */
  75                 mux_pwm = mux_pwm & 0xCF;
  76                 twl_i2c_write_u8(TWL4030_MODULE_INTBR,
  77                                         enb_pwm, TWL_INTBR_GPBR1);
  78                 twl_i2c_write_u8(TWL4030_MODULE_INTBR,
  79                                         mux_pwm, TWL_INTBR_PMBR1);
  80                 return 0;
  81         }
  82
  83         if (!((enb_pwm & 0xA) && (mux_pwm & 0x30))) {
  84                 /* change gpio pin to pwm1 pin */
  85                 mux_pwm = mux_pwm | 0x30;
  86                 /* enable pwm1 output and clock*/
  87                 enb_pwm = enb_pwm | 0x0A;
  88                 twl_i2c_write_u8(TWL4030_MODULE_INTBR,
  89                                         mux_pwm, TWL_INTBR_PMBR1);
  90                 twl_i2c_write_u8(TWL4030_MODULE_INTBR,
  91                                         enb_pwm, TWL_INTBR_GPBR1);
  92         }
  93
  94         c = ((50 * (100 - level)) / 100) + 1;
  95         twl_i2c_write_u8(TWL4030_MODULE_PWM1, 0x7F, TWL_LED_PWMOFF);
  96         twl_i2c_write_u8(TWL4030_MODULE_PWM1, c, TWL_LED_PWMON);
  97 #else
  98         pr_warn("Backlight not enabled\n");
  99 #endif
 100
 101         return 0;
 102 }
 103
 104 static struct omap_dss_device zoom_lcd_device = {
 105         .name                   = "lcd",
 106         .driver_name            = "NEC_8048_panel",
 107         .type                   = OMAP_DISPLAY_TYPE_DPI,
 108         .phy.dpi.data_lines     = 24,
 109         .platform_enable        = zoom_panel_enable_lcd,
 110         .platform_disable       = zoom_panel_disable_lcd,
 111         .max_backlight_level    = 100,
 112         .set_backlight          = zoom_set_bl_intensity,
 113 };
 114
 115 static struct omap_dss_device *zoom_dss_devices[] = {
 116         &zoom_lcd_device,
 117 };
 118
 119 static struct omap_dss_board_info zoom_dss_data = {
 120         .num_devices            = ARRAY_SIZE(zoom_dss_devices),
 121         .devices                = zoom_dss_devices,
 122         .default_device         = &zoom_lcd_device,
 123 };
 124
 125 static struct omap2_mcspi_device_config dss_lcd_mcspi_config = {
 126         .turbo_mode             = 1,
 127 };
 128
 129 static struct spi_board_info nec_8048_spi_board_info[] __initdata = {
 130         [0] = {
 131                 .modalias               = "nec_8048_spi",
 132                 .bus_num                = 1,
 133                 .chip_select            = 2,
 134                 .max_speed_hz           = 375000,
 135                 .controller_data        = &dss_lcd_mcspi_config,
 136         },
 137 };
 138
 139 void __init zoom_display_init(void)
 140 {
 141         omap_display_init(&zoom_dss_data);
 142         spi_register_board_info(nec_8048_spi_board_info,
 143                                 ARRAY_SIZE(nec_8048_spi_board_info));
 144         zoom_lcd_panel_init();
 145 }
 146