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 TWL_LED_LEDEN           0x00
  41 #define TWL_PWMA_PWMAON         0x00
  42 #define TWL_PWMA_PWMAOFF        0x01
  43
  44 static unsigned int bklight_level;
  45
  46 static int omap2evm_panel_init(struct lcd_panel *panel,
  47                                 struct omapfb_device *fbdev)
  48 {
  49         gpio_request(LCD_PANEL_ENABLE_GPIO, "LCD enable");
  50         gpio_request(LCD_PANEL_LR, "LCD lr");
  51         gpio_request(LCD_PANEL_UD, "LCD ud");
  52         gpio_request(LCD_PANEL_INI, "LCD ini");
  53         gpio_request(LCD_PANEL_QVGA, "LCD qvga");
  54         gpio_request(LCD_PANEL_RESB, "LCD resb");
  55
  56         gpio_direction_output(LCD_PANEL_ENABLE_GPIO, 1);
  57         gpio_direction_output(LCD_PANEL_RESB, 1);
  58         gpio_direction_output(LCD_PANEL_INI, 1);
  59         gpio_direction_output(LCD_PANEL_QVGA, 0);
  60         gpio_direction_output(LCD_PANEL_LR, 1);
  61         gpio_direction_output(LCD_PANEL_UD, 1);
  62
  63         twl4030_i2c_write_u8(TWL4030_MODULE_LED, 0x11, TWL_LED_LEDEN);
  64         twl4030_i2c_write_u8(TWL4030_MODULE_PWMA, 0x01, TWL_PWMA_PWMAON);
  65         twl4030_i2c_write_u8(TWL4030_MODULE_PWMA, 0x02, TWL_PWMA_PWMAOFF);
  66         bklight_level = 100;
  67
  68         return 0;
  69 }
  70
  71 static void omap2evm_panel_cleanup(struct lcd_panel *panel)
  72 {
  73         gpio_free(LCD_PANEL_RESB);
  74         gpio_free(LCD_PANEL_QVGA);
  75         gpio_free(LCD_PANEL_INI);
  76         gpio_free(LCD_PANEL_UD);
  77         gpio_free(LCD_PANEL_LR);
  78         gpio_free(LCD_PANEL_ENABLE_GPIO);
  79 }
  80
  81 static int omap2evm_panel_enable(struct lcd_panel *panel)
  82 {
  83         gpio_set_value(LCD_PANEL_ENABLE_GPIO, 0);
  84         return 0;
  85 }
  86
  87 static void omap2evm_panel_disable(struct lcd_panel *panel)
  88 {
  89         gpio_set_value(LCD_PANEL_ENABLE_GPIO, 1);
  90 }
  91
  92 static unsigned long omap2evm_panel_get_caps(struct lcd_panel *panel)
  93 {
  94         return 0;
  95 }
  96
  97 static int omap2evm_bklight_setlevel(struct lcd_panel *panel,
  98                                                 unsigned int level)
  99 {
 100         u8 c;
 101         if ((level >= 0) && (level <= 100)) {
 102                 c = (125 * (100 - level)) / 100 + 2;
 103                 twl4030_i2c_write_u8(TWL4030_MODULE_PWMA, c, TWL_PWMA_PWMAOFF);
 104                 bklight_level = level;
 105         }
 106         return 0;
 107 }
 108
 109 static unsigned int omap2evm_bklight_getlevel(struct lcd_panel *panel)
 110 {
 111         return bklight_level;
 112 }
 113
 114 static unsigned int omap2evm_bklight_getmaxlevel(struct lcd_panel *panel)
 115 {
 116         return 100;
 117 }
 118
 119 struct lcd_panel omap2evm_panel = {
 120         .name           = "omap2evm",
 121         .config         = OMAP_LCDC_PANEL_TFT | OMAP_LCDC_INV_VSYNC |
 122                           OMAP_LCDC_INV_HSYNC,
 123
 124         .bpp            = 16,
 125         .data_lines     = 18,
 126         .x_res          = 480,
 127         .y_res          = 640,
 128         .hsw            = 3,
 129         .hfp            = 0,
 130         .hbp            = 28,
 131         .vsw            = 2,
 132         .vfp            = 1,
 133         .vbp            = 0,
 134
 135         .pixel_clock    = 20000,
 136
 137         .init           = omap2evm_panel_init,
 138         .cleanup        = omap2evm_panel_cleanup,
 139         .enable         = omap2evm_panel_enable,
 140         .disable        = omap2evm_panel_disable,
 141         .get_caps       = omap2evm_panel_get_caps,
 142         .set_bklight_level      = omap2evm_bklight_setlevel,
 143         .get_bklight_level      = omap2evm_bklight_getlevel,
 144         .get_bklight_max        = omap2evm_bklight_getmaxlevel,
 145 };
 146
 147 static int omap2evm_panel_probe(struct platform_device *pdev)
 148 {
 149         omapfb_register_panel(&omap2evm_panel);
 150         return 0;
 151 }
 152
 153 static int omap2evm_panel_remove(struct platform_device *pdev)
 154 {
 155         return 0;
 156 }
 157
 158 static int omap2evm_panel_suspend(struct platform_device *pdev,
 159                                    pm_message_t mesg)
 160 {
 161         return 0;
 162 }
 163
 164 static int omap2evm_panel_resume(struct platform_device *pdev)
 165 {
 166         return 0;
 167 }
 168
 169 struct platform_driver omap2evm_panel_driver = {
 170         .probe          = omap2evm_panel_probe,
 171         .remove         = omap2evm_panel_remove,
 172         .suspend        = omap2evm_panel_suspend,
 173         .resume         = omap2evm_panel_resume,
 174         .driver         = {
 175                 .name   = "omap2evm_lcd",
 176                 .owner  = THIS_MODULE,
 177         },
 178 };
 179
 180 static int __init omap2evm_panel_drv_init(void)
 181 {
 182         return platform_driver_register(&omap2evm_panel_driver);
 183 }
 184
 185 static void __exit omap2evm_panel_drv_exit(void)
 186 {
 187         platform_driver_unregister(&omap2evm_panel_driver);
 188 }
 189
 190 module_init(omap2evm_panel_drv_init);
 191 module_exit(omap2evm_panel_drv_exit);