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/twl4030.h>
  28
  29 #include <mach/mux.h>
  30 #include <mach/omapfb.h>
  31 #include <asm/mach-types.h>
  32
  33 #define LCD_PANEL_ENABLE_GPIO   154
  34 #define LCD_PANEL_LR            128
  35 #define LCD_PANEL_UD            129
  36 #define LCD_PANEL_INI           152
  37 #define LCD_PANEL_QVGA          148
  38 #define LCD_PANEL_RESB          153
  39
  40 #define LCD_XRES                480
  41 #define LCD_YRES                640
  42 #define LCD_PIXCLOCK_MAX        20000 /* in kHz */
  43
  44 #define TWL_LED_LEDEN           0x00
  45 #define TWL_PWMA_PWMAON         0x00
  46 #define TWL_PWMA_PWMAOFF        0x01
  47
  48 static unsigned int bklight_level;
  49
  50 static int omap2evm_panel_init(struct lcd_panel *panel,
  51                                 struct omapfb_device *fbdev)
  52 {
  53         gpio_request(LCD_PANEL_ENABLE_GPIO, "LCD enable");
  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_QVGA, "LCD qvga");
  58         gpio_request(LCD_PANEL_RESB, "LCD resb");
  59
  60         gpio_direction_output(LCD_PANEL_ENABLE_GPIO, 1);
  61         gpio_direction_output(LCD_PANEL_RESB, 1);
  62         gpio_direction_output(LCD_PANEL_INI, 1);
  63         gpio_direction_output(LCD_PANEL_QVGA, 0);
  64         gpio_direction_output(LCD_PANEL_LR, 1);
  65         gpio_direction_output(LCD_PANEL_UD, 1);
  66
  67         twl4030_i2c_write_u8(TWL4030_MODULE_LED, 0x11, TWL_LED_LEDEN);
  68         twl4030_i2c_write_u8(TWL4030_MODULE_PWMA, 0x01, TWL_PWMA_PWMAON);
  69         twl4030_i2c_write_u8(TWL4030_MODULE_PWMA, 0x02, TWL_PWMA_PWMAOFF);
  70         bklight_level = 100;
  71
  72         return 0;
  73 }
  74
  75 static void omap2evm_panel_cleanup(struct lcd_panel *panel)
  76 {
  77 }
  78
  79 static int omap2evm_panel_enable(struct lcd_panel *panel)
  80 {
  81         gpio_set_value(LCD_PANEL_ENABLE_GPIO, 0);
  82         return 0;
  83 }
  84
  85 static void omap2evm_panel_disable(struct lcd_panel *panel)
  86 {
  87         gpio_set_value(LCD_PANEL_ENABLE_GPIO, 1);
  88 }
  89
  90 static unsigned long omap2evm_panel_get_caps(struct lcd_panel *panel)
  91 {
  92         return 0;
  93 }
  94
  95 static int omap2evm_bklight_setlevel(struct lcd_panel *panel,
  96                                                 unsigned int level)
  97 {
  98         u8 c;
  99         if ((level >= 0) && (level <= 100)) {
 100                 c = (125 * (100 - level)) / 100 + 2;
 101                 twl4030_i2c_write_u8(TWL4030_MODULE_PWMA, c, TWL_PWMA_PWMAOFF);
 102                 bklight_level = level;
 103         }
 104         return 0;
 105 }
 106
 107 static unsigned int omap2evm_bklight_getlevel(struct lcd_panel *panel)
 108 {
 109         return bklight_level;
 110 }
 111
 112 static unsigned int omap2evm_bklight_getmaxlevel(struct lcd_panel *panel)
 113 {
 114         return 100;
 115 }
 116
 117 struct lcd_panel omap2evm_panel = {
 118         .name           = "omap2evm",
 119         .config         = OMAP_LCDC_PANEL_TFT | OMAP_LCDC_INV_VSYNC |
 120                           OMAP_LCDC_INV_HSYNC,
 121
 122         .bpp            = 16,
 123         .data_lines     = 18,
 124         .x_res          = LCD_XRES,
 125         .y_res          = LCD_YRES,
 126         .hsw            = 3,
 127         .hfp            = 0,
 128         .hbp            = 28,
 129         .vsw            = 2,
 130         .vfp            = 1,
 131         .vbp            = 0,
 132
 133         .pixel_clock    = LCD_PIXCLOCK_MAX,
 134
 135         .init           = omap2evm_panel_init,
 136         .cleanup        = omap2evm_panel_cleanup,
 137         .enable         = omap2evm_panel_enable,
 138         .disable        = omap2evm_panel_disable,
 139         .get_caps       = omap2evm_panel_get_caps,
 140         .set_bklight_level      = omap2evm_bklight_setlevel,
 141         .get_bklight_level      = omap2evm_bklight_getlevel,
 142         .get_bklight_max        = omap2evm_bklight_getmaxlevel,
 143 };
 144
 145 static int omap2evm_panel_probe(struct platform_device *pdev)
 146 {
 147         omapfb_register_panel(&omap2evm_panel);
 148         return 0;
 149 }
 150
 151 static int omap2evm_panel_remove(struct platform_device *pdev)
 152 {
 153         return 0;
 154 }
 155
 156 static int omap2evm_panel_suspend(struct platform_device *pdev,
 157                                    pm_message_t mesg)
 158 {
 159         return 0;
 160 }
 161
 162 static int omap2evm_panel_resume(struct platform_device *pdev)
 163 {
 164         return 0;
 165 }
 166
 167 struct platform_driver omap2evm_panel_driver = {
 168         .probe          = omap2evm_panel_probe,
 169         .remove         = omap2evm_panel_remove,
 170         .suspend        = omap2evm_panel_suspend,
 171         .resume         = omap2evm_panel_resume,
 172         .driver         = {
 173                 .name   = "omap2evm_lcd",
 174                 .owner  = THIS_MODULE,
 175         },
 176 };
 177
 178 static int __init omap2evm_panel_drv_init(void)
 179 {
 180         return platform_driver_register(&omap2evm_panel_driver);
 181 }
 182
 183 static void __exit omap2evm_panel_drv_exit(void)
 184 {
 185         platform_driver_unregister(&omap2evm_panel_driver);
 186 }
 187
 188 module_init(omap2evm_panel_drv_init);
 189 module_exit(omap2evm_panel_drv_exit);