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/twl4030.h>
  27
  28 #include <mach/mux.h>
  29 #include <mach/omapfb.h>
  30 #include <asm/mach-types.h>
  31
  32 #define LCD_PANEL_ENABLE_GPIO       153
  33 #define LCD_PANEL_LR                2
  34 #define LCD_PANEL_UD                3
  35 #define LCD_PANEL_INI               152
  36 #define LCD_PANEL_QVGA              154
  37 #define LCD_PANEL_RESB              155
  38
  39 #define LCD_XRES                480
  40 #define LCD_YRES                640
  41 #define LCD_PIXCLOCK            26000 /* in kHz  */
  42
  43 #define ENABLE_VDAC_DEDICATED   0x03
  44 #define ENABLE_VDAC_DEV_GRP     0x20
  45 #define ENABLE_VPLL2_DEDICATED  0x05
  46 #define ENABLE_VPLL2_DEV_GRP    0xE0
  47
  48 #define TWL_LED_LEDEN           0x00
  49 #define TWL_PWMA_PWMAON         0x00
  50 #define TWL_PWMA_PWMAOFF        0x01
  51
  52 static unsigned int bklight_level;
  53
  54 static int omap3evm_panel_init(struct lcd_panel *panel,
  55                                 struct omapfb_device *fbdev)
  56 {
  57         gpio_request(LCD_PANEL_LR, "LCD lr");
  58         gpio_request(LCD_PANEL_UD, "LCD ud");
  59         gpio_request(LCD_PANEL_INI, "LCD ini");
  60         gpio_request(LCD_PANEL_RESB, "LCD resb");
  61         gpio_request(LCD_PANEL_QVGA, "LCD qvga");
  62
  63         gpio_direction_output(LCD_PANEL_RESB, 1);
  64         gpio_direction_output(LCD_PANEL_INI, 1);
  65         gpio_direction_output(LCD_PANEL_QVGA, 0);
  66         gpio_direction_output(LCD_PANEL_LR, 1);
  67         gpio_direction_output(LCD_PANEL_UD, 1);
  68
  69         twl4030_i2c_write_u8(TWL4030_MODULE_LED, 0x11, TWL_LED_LEDEN);
  70         twl4030_i2c_write_u8(TWL4030_MODULE_PWMA, 0x01, TWL_PWMA_PWMAON);
  71         twl4030_i2c_write_u8(TWL4030_MODULE_PWMA, 0x02, TWL_PWMA_PWMAOFF);
  72         bklight_level = 100;
  73
  74         return 0;
  75 }
  76
  77 static void omap3evm_panel_cleanup(struct lcd_panel *panel)
  78 {
  79 }
  80
  81 static int omap3evm_panel_enable(struct lcd_panel *panel)
  82 {
  83         gpio_set_value(LCD_PANEL_ENABLE_GPIO, 0);
  84         return 0;
  85 }
  86
  87 static void omap3evm_panel_disable(struct lcd_panel *panel)
  88 {
  89         gpio_set_value(LCD_PANEL_ENABLE_GPIO, 1);
  90 }
  91
  92 static unsigned long omap3evm_panel_get_caps(struct lcd_panel *panel)
  93 {
  94         return 0;
  95 }
  96
  97 static int omap3evm_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 omap3evm_bklight_getlevel(struct lcd_panel *panel)
 110 {
 111         return bklight_level;
 112 }
 113
 114 static unsigned int omap3evm_bklight_getmaxlevel(struct lcd_panel *panel)
 115 {
 116         return 100;
 117 }
 118
 119 struct lcd_panel omap3evm_panel = {
 120         .name           = "omap3evm",
 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          = LCD_XRES,
 127         .y_res          = LCD_YRES,
 128         .hsw            = 3,            /* hsync_len (4) - 1 */
 129         .hfp            = 3,            /* right_margin (4) - 1 */
 130         .hbp            = 39,           /* left_margin (40) - 1 */
 131         .vsw            = 1,            /* vsync_len (2) - 1 */
 132         .vfp            = 2,            /* lower_margin */
 133         .vbp            = 7,            /* upper_margin (8) - 1 */
 134
 135         .pixel_clock    = LCD_PIXCLOCK,
 136
 137         .init           = omap3evm_panel_init,
 138         .cleanup        = omap3evm_panel_cleanup,
 139         .enable         = omap3evm_panel_enable,
 140         .disable        = omap3evm_panel_disable,
 141         .get_caps       = omap3evm_panel_get_caps,
 142         .set_bklight_level      = omap3evm_bklight_setlevel,
 143         .get_bklight_level      = omap3evm_bklight_getlevel,
 144         .get_bklight_max        = omap3evm_bklight_getmaxlevel,
 145 };
 146
 147 static int omap3evm_panel_probe(struct platform_device *pdev)
 148 {
 149         omapfb_register_panel(&omap3evm_panel);
 150         return 0;
 151 }
 152
 153 static int omap3evm_panel_remove(struct platform_device *pdev)
 154 {
 155         return 0;
 156 }
 157
 158 static int omap3evm_panel_suspend(struct platform_device *pdev,
 159                                    pm_message_t mesg)
 160 {
 161         return 0;
 162 }
 163
 164 static int omap3evm_panel_resume(struct platform_device *pdev)
 165 {
 166         return 0;
 167 }
 168
 169 struct platform_driver omap3evm_panel_driver = {
 170         .probe          = omap3evm_panel_probe,
 171         .remove         = omap3evm_panel_remove,
 172         .suspend        = omap3evm_panel_suspend,
 173         .resume         = omap3evm_panel_resume,
 174         .driver         = {
 175                 .name   = "omap3evm_lcd",
 176                 .owner  = THIS_MODULE,
 177         },
 178 };
 179
 180 static int __init omap3evm_panel_drv_init(void)
 181 {
 182         return platform_driver_register(&omap3evm_panel_driver);
 183 }
 184
 185 static void __exit omap3evm_panel_drv_exit(void)
 186 {
 187         platform_driver_unregister(&omap3evm_panel_driver);
 188 }
 189
 190 module_init(omap3evm_panel_drv_init);
 191 module_exit(omap3evm_panel_drv_exit);