release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/video/omap/lcd_omap2evm.c

   1 /*
   2  * LCD panel support for the MISTRAL OMAP2EVM board
   3  *
   4  * Author: Arun C <arunedarath@mistralsolutions.com>
   5  *
   6  * Derived from drivers/video/omap/lcd_omap3evm.c
   7  * Derived from drivers/video/omap/lcd-apollon.c
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU General Public License as published by the
  11  * Free Software Foundation; either version 2 of the License, or (at your
  12  * option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write to the Free Software Foundation, Inc.,
  21  * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  22  */
  23
  24 #include <linux/module.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/gpio.h>
  27 #include <linux/i2c/twl.h>
  28
  29 #include <plat/mux.h>
  30 #include <asm/mach-types.h>
  31
  32 #include "omapfb.h"
  33
  34 #define LCD_PANEL_ENABLE_GPIO   154
  35 #define LCD_PANEL_LR            128
  36 #define LCD_PANEL_UD            129
  37 #define LCD_PANEL_INI           152
  38 #define LCD_PANEL_QVGA          148
  39 #define LCD_PANEL_RESB          153
  40
  41 #define TWL_LED_LEDEN           0x00
  42 #define TWL_PWMA_PWMAON         0x00
  43 #define TWL_PWMA_PWMAOFF        0x01
  44
  45 static unsigned int bklight_level;
  46
  47 static int omap2evm_panel_init(struct lcd_panel *panel,
  48                                 struct omapfb_device *fbdev)
  49 {
  50         gpio_request(LCD_PANEL_ENABLE_GPIO, "LCD enable");
  51         gpio_request(LCD_PANEL_LR, "LCD lr");
  52         gpio_request(LCD_PANEL_UD, "LCD ud");
  53         gpio_request(LCD_PANEL_INI, "LCD ini");
  54         gpio_request(LCD_PANEL_QVGA, "LCD qvga");
  55         gpio_request(LCD_PANEL_RESB, "LCD resb");
  56
  57         gpio_direction_output(LCD_PANEL_ENABLE_GPIO, 1);
  58         gpio_direction_output(LCD_PANEL_RESB, 1);
  59         gpio_direction_output(LCD_PANEL_INI, 1);
  60         gpio_direction_output(LCD_PANEL_QVGA, 0);
  61         gpio_direction_output(LCD_PANEL_LR, 1);
  62         gpio_direction_output(LCD_PANEL_UD, 1);
  63
  64         twl_i2c_write_u8(TWL4030_MODULE_LED, 0x11, TWL_LED_LEDEN);
  65         twl_i2c_write_u8(TWL4030_MODULE_PWMA, 0x01, TWL_PWMA_PWMAON);
  66         twl_i2c_write_u8(TWL4030_MODULE_PWMA, 0x02, TWL_PWMA_PWMAOFF);
  67         bklight_level = 100;
  68
  69         return 0;
  70 }
  71
  72 static void omap2evm_panel_cleanup(struct lcd_panel *panel)
  73 {
  74         gpio_free(LCD_PANEL_RESB);
  75         gpio_free(LCD_PANEL_QVGA);
  76         gpio_free(LCD_PANEL_INI);
  77         gpio_free(LCD_PANEL_UD);
  78         gpio_free(LCD_PANEL_LR);
  79         gpio_free(LCD_PANEL_ENABLE_GPIO);
  80 }
  81
  82 static int omap2evm_panel_enable(struct lcd_panel *panel)
  83 {
  84         gpio_set_value(LCD_PANEL_ENABLE_GPIO, 0);
  85         return 0;
  86 }
  87
  88 static void omap2evm_panel_disable(struct lcd_panel *panel)
  89 {
  90         gpio_set_value(LCD_PANEL_ENABLE_GPIO, 1);
  91 }
  92
  93 static unsigned long omap2evm_panel_get_caps(struct lcd_panel *panel)
  94 {
  95         return 0;
  96 }
  97
  98 static int omap2evm_bklight_setlevel(struct lcd_panel *panel,
  99                                                 unsigned int level)
 100 {
 101         u8 c;
 102         if ((level >= 0) && (level <= 100)) {
 103                 c = (125 * (100 - level)) / 100 + 2;
 104                 twl_i2c_write_u8(TWL4030_MODULE_PWMA, c, TWL_PWMA_PWMAOFF);
 105                 bklight_level = level;
 106         }
 107         return 0;
 108 }
 109
 110 static unsigned int omap2evm_bklight_getlevel(struct lcd_panel *panel)
 111 {
 112         return bklight_level;
 113 }
 114
 115 static unsigned int omap2evm_bklight_getmaxlevel(struct lcd_panel *panel)
 116 {
 117         return 100;
 118 }
 119
 120 struct lcd_panel omap2evm_panel = {
 121         .name           = "omap2evm",
 122         .config         = OMAP_LCDC_PANEL_TFT | OMAP_LCDC_INV_VSYNC |
 123                           OMAP_LCDC_INV_HSYNC,
 124
 125         .bpp            = 16,
 126         .data_lines     = 18,
 127         .x_res          = 480,
 128         .y_res          = 640,
 129         .hsw            = 3,
 130         .hfp            = 0,
 131         .hbp            = 28,
 132         .vsw            = 2,
 133         .vfp            = 1,
 134         .vbp            = 0,
 135
 136         .pixel_clock    = 20000,
 137
 138         .init           = omap2evm_panel_init,
 139         .cleanup        = omap2evm_panel_cleanup,
 140         .enable         = omap2evm_panel_enable,
 141         .disable        = omap2evm_panel_disable,
 142         .get_caps       = omap2evm_panel_get_caps,
 143         .set_bklight_level      = omap2evm_bklight_setlevel,
 144         .get_bklight_level      = omap2evm_bklight_getlevel,
 145         .get_bklight_max        = omap2evm_bklight_getmaxlevel,
 146 };
 147
 148 static int omap2evm_panel_probe(struct platform_device *pdev)
 149 {
 150         omapfb_register_panel(&omap2evm_panel);
 151         return 0;
 152 }
 153
 154 static int omap2evm_panel_remove(struct platform_device *pdev)
 155 {
 156         return 0;
 157 }
 158
 159 static int omap2evm_panel_suspend(struct platform_device *pdev,
 160                                    pm_message_t mesg)
 161 {
 162         return 0;
 163 }
 164
 165 static int omap2evm_panel_resume(struct platform_device *pdev)
 166 {
 167         return 0;
 168 }
 169
 170 struct platform_driver omap2evm_panel_driver = {
 171         .probe          = omap2evm_panel_probe,
 172         .remove         = omap2evm_panel_remove,
 173         .suspend        = omap2evm_panel_suspend,
 174         .resume         = omap2evm_panel_resume,
 175         .driver         = {
 176                 .name   = "omap2evm_lcd",
 177                 .owner  = THIS_MODULE,
 178         },
 179 };
 180
 181 static int __init omap2evm_panel_drv_init(void)
 182 {
 183         return platform_driver_register(&omap2evm_panel_driver);
 184 }
 185
 186 static void __exit omap2evm_panel_drv_exit(void)
 187 {
 188         platform_driver_unregister(&omap2evm_panel_driver);
 189 }
 190
 191 module_init(omap2evm_panel_drv_init);
 192 module_exit(omap2evm_panel_drv_exit);