release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/video/omap/lcd_omap3evm.c

   1 /*
   2  * LCD panel support for the TI OMAP3 EVM board
   3  *
   4  * Author: Steve Sakoman <steve@sakoman.com>
   5  *
   6  * Derived from drivers/video/omap/lcd-apollon.c
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License as published by the
  10  * Free Software Foundation; either version 2 of the License, or (at your
  11  * option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, write to the Free Software Foundation, Inc.,
  20  * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  21  */
  22
  23 #include <linux/module.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/gpio.h>
  26 #include <linux/i2c/twl.h>
  27
  28 #include <plat/mux.h>
  29 #include <asm/mach-types.h>
  30
  31 #include "omapfb.h"
  32
  33 #define LCD_PANEL_ENABLE_GPIO       153
  34 #define LCD_PANEL_LR                2
  35 #define LCD_PANEL_UD                3
  36 #define LCD_PANEL_INI               152
  37 #define LCD_PANEL_QVGA              154
  38 #define LCD_PANEL_RESB              155
  39
  40 #define ENABLE_VDAC_DEDICATED   0x03
  41 #define ENABLE_VDAC_DEV_GRP     0x20
  42 #define ENABLE_VPLL2_DEDICATED  0x05
  43 #define ENABLE_VPLL2_DEV_GRP    0xE0
  44
  45 #define TWL_LED_LEDEN           0x00
  46 #define TWL_PWMA_PWMAON         0x00
  47 #define TWL_PWMA_PWMAOFF        0x01
  48
  49 static unsigned int bklight_level;
  50
  51 static int omap3evm_panel_init(struct lcd_panel *panel,
  52                                 struct omapfb_device *fbdev)
  53 {
  54         gpio_request(LCD_PANEL_LR, "LCD lr");
  55         gpio_request(LCD_PANEL_UD, "LCD ud");
  56         gpio_request(LCD_PANEL_INI, "LCD ini");
  57         gpio_request(LCD_PANEL_RESB, "LCD resb");
  58         gpio_request(LCD_PANEL_QVGA, "LCD qvga");
  59
  60         gpio_direction_output(LCD_PANEL_RESB, 1);
  61         gpio_direction_output(LCD_PANEL_INI, 1);
  62         gpio_direction_output(LCD_PANEL_QVGA, 0);
  63         gpio_direction_output(LCD_PANEL_LR, 1);
  64         gpio_direction_output(LCD_PANEL_UD, 1);
  65
  66         twl_i2c_write_u8(TWL4030_MODULE_LED, 0x11, TWL_LED_LEDEN);
  67         twl_i2c_write_u8(TWL4030_MODULE_PWMA, 0x01, TWL_PWMA_PWMAON);
  68         twl_i2c_write_u8(TWL4030_MODULE_PWMA, 0x02, TWL_PWMA_PWMAOFF);
  69         bklight_level = 100;
  70
  71         return 0;
  72 }
  73
  74 static void omap3evm_panel_cleanup(struct lcd_panel *panel)
  75 {
  76         gpio_free(LCD_PANEL_QVGA);
  77         gpio_free(LCD_PANEL_RESB);
  78         gpio_free(LCD_PANEL_INI);
  79         gpio_free(LCD_PANEL_UD);
  80         gpio_free(LCD_PANEL_LR);
  81 }
  82
  83 static int omap3evm_panel_enable(struct lcd_panel *panel)
  84 {
  85         gpio_set_value(LCD_PANEL_ENABLE_GPIO, 0);
  86         return 0;
  87 }
  88
  89 static void omap3evm_panel_disable(struct lcd_panel *panel)
  90 {
  91         gpio_set_value(LCD_PANEL_ENABLE_GPIO, 1);
  92 }
  93
  94 static unsigned long omap3evm_panel_get_caps(struct lcd_panel *panel)
  95 {
  96         return 0;
  97 }
  98
  99 static int omap3evm_bklight_setlevel(struct lcd_panel *panel,
 100                                                 unsigned int level)
 101 {
 102         u8 c;
 103         if ((level >= 0) && (level <= 100)) {
 104                 c = (125 * (100 - level)) / 100 + 2;
 105                 twl_i2c_write_u8(TWL4030_MODULE_PWMA, c, TWL_PWMA_PWMAOFF);
 106                 bklight_level = level;
 107         }
 108         return 0;
 109 }
 110
 111 static unsigned int omap3evm_bklight_getlevel(struct lcd_panel *panel)
 112 {
 113         return bklight_level;
 114 }
 115
 116 static unsigned int omap3evm_bklight_getmaxlevel(struct lcd_panel *panel)
 117 {
 118         return 100;
 119 }
 120
 121 struct lcd_panel omap3evm_panel = {
 122         .name           = "omap3evm",
 123         .config         = OMAP_LCDC_PANEL_TFT | OMAP_LCDC_INV_VSYNC |
 124                           OMAP_LCDC_INV_HSYNC,
 125
 126         .bpp            = 16,
 127         .data_lines     = 18,
 128         .x_res          = 480,
 129         .y_res          = 640,
 130         .hsw            = 3,            /* hsync_len (4) - 1 */
 131         .hfp            = 3,            /* right_margin (4) - 1 */
 132         .hbp            = 39,           /* left_margin (40) - 1 */
 133         .vsw            = 1,            /* vsync_len (2) - 1 */
 134         .vfp            = 2,            /* lower_margin */
 135         .vbp            = 7,            /* upper_margin (8) - 1 */
 136
 137         .pixel_clock    = 26000,
 138
 139         .init           = omap3evm_panel_init,
 140         .cleanup        = omap3evm_panel_cleanup,
 141         .enable         = omap3evm_panel_enable,
 142         .disable        = omap3evm_panel_disable,
 143         .get_caps       = omap3evm_panel_get_caps,
 144         .set_bklight_level      = omap3evm_bklight_setlevel,
 145         .get_bklight_level      = omap3evm_bklight_getlevel,
 146         .get_bklight_max        = omap3evm_bklight_getmaxlevel,
 147 };
 148
 149 static int omap3evm_panel_probe(struct platform_device *pdev)
 150 {
 151         omapfb_register_panel(&omap3evm_panel);
 152         return 0;
 153 }
 154
 155 static int omap3evm_panel_remove(struct platform_device *pdev)
 156 {
 157         return 0;
 158 }
 159
 160 static int omap3evm_panel_suspend(struct platform_device *pdev,
 161                                    pm_message_t mesg)
 162 {
 163         return 0;
 164 }
 165
 166 static int omap3evm_panel_resume(struct platform_device *pdev)
 167 {
 168         return 0;
 169 }
 170
 171 struct platform_driver omap3evm_panel_driver = {
 172         .probe          = omap3evm_panel_probe,
 173         .remove         = omap3evm_panel_remove,
 174         .suspend        = omap3evm_panel_suspend,
 175         .resume         = omap3evm_panel_resume,
 176         .driver         = {
 177                 .name   = "omap3evm_lcd",
 178                 .owner  = THIS_MODULE,
 179         },
 180 };
 181
 182 static int __init omap3evm_panel_drv_init(void)
 183 {
 184         return platform_driver_register(&omap3evm_panel_driver);
 185 }
 186
 187 static void __exit omap3evm_panel_drv_exit(void)
 188 {
 189         platform_driver_unregister(&omap3evm_panel_driver);
 190 }
 191
 192 module_init(omap3evm_panel_drv_init);
 193 module_exit(omap3evm_panel_drv_exit);