drivers/video/omap2/dss/hdmi_panel.c

   1 /*
   2  * hdmi_panel.c
   3  *
   4  * HDMI library support functions for TI OMAP4 processors.
   5  *
   6  * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com/
   7  * Authors:     Mythri P k <mythripk@ti.com>
   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 version 2 as published by
  11  * the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but WITHOUT
  14  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  16  * more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along with
  19  * this program.  If not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #include <linux/kernel.h>
  23 #include <linux/err.h>
  24 #include <linux/io.h>
  25 #include <linux/mutex.h>
  26 #include <linux/module.h>
  27 #include <video/omapdss.h>
  28
  29 #include "dss.h"
  30
  31 static struct {
  32         struct mutex hdmi_lock;
  33 } hdmi;
  34
  35
  36 static int hdmi_panel_probe(struct omap_dss_device *dssdev)
  37 {
  38         DSSDBG("ENTER hdmi_panel_probe\n");
  39
  40         dssdev->panel.config = OMAP_DSS_LCD_TFT |
  41                         OMAP_DSS_LCD_IVS | OMAP_DSS_LCD_IHS;
  42
  43         /*
  44          * Initialize the timings to 640 * 480
  45          * This is only for framebuffer update not for TV timing setting
  46          * Setting TV timing will be done only on enable
  47          */
  48         dssdev->panel.timings.x_res = 640;
  49         dssdev->panel.timings.y_res = 480;
  50
  51         DSSDBG("hdmi_panel_probe x_res= %d y_res = %d\n",
  52                 dssdev->panel.timings.x_res,
  53                 dssdev->panel.timings.y_res);
  54         return 0;
  55 }
  56
  57 static void hdmi_panel_remove(struct omap_dss_device *dssdev)
  58 {
  59
  60 }
  61
  62 static int hdmi_panel_enable(struct omap_dss_device *dssdev)
  63 {
  64         int r = 0;
  65         DSSDBG("ENTER hdmi_panel_enable\n");
  66
  67         mutex_lock(&hdmi.hdmi_lock);
  68
  69         if (dssdev->state != OMAP_DSS_DISPLAY_DISABLED) {
  70                 r = -EINVAL;
  71                 goto err;
  72         }
  73
  74         r = omapdss_hdmi_display_enable(dssdev);
  75         if (r) {
  76                 DSSERR("failed to power on\n");
  77                 goto err;
  78         }
  79
  80         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
  81
  82 err:
  83         mutex_unlock(&hdmi.hdmi_lock);
  84
  85         return r;
  86 }
  87
  88 static void hdmi_panel_disable(struct omap_dss_device *dssdev)
  89 {
  90         mutex_lock(&hdmi.hdmi_lock);
  91
  92         if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
  93                 omapdss_hdmi_display_disable(dssdev);
  94
  95         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
  96
  97         mutex_unlock(&hdmi.hdmi_lock);
  98 }
  99
 100 static int hdmi_panel_suspend(struct omap_dss_device *dssdev)
 101 {
 102         int r = 0;
 103
 104         mutex_lock(&hdmi.hdmi_lock);
 105
 106         if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE) {
 107                 r = -EINVAL;
 108                 goto err;
 109         }
 110
 111         dssdev->state = OMAP_DSS_DISPLAY_SUSPENDED;
 112
 113         omapdss_hdmi_display_disable(dssdev);
 114
 115 err:
 116         mutex_unlock(&hdmi.hdmi_lock);
 117
 118         return r;
 119 }
 120
 121 static int hdmi_panel_resume(struct omap_dss_device *dssdev)
 122 {
 123         int r = 0;
 124
 125         mutex_lock(&hdmi.hdmi_lock);
 126
 127         if (dssdev->state != OMAP_DSS_DISPLAY_SUSPENDED) {
 128                 r = -EINVAL;
 129                 goto err;
 130         }
 131
 132         r = omapdss_hdmi_display_enable(dssdev);
 133         if (r) {
 134                 DSSERR("failed to power on\n");
 135                 goto err;
 136         }
 137
 138         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 139
 140 err:
 141         mutex_unlock(&hdmi.hdmi_lock);
 142
 143         return r;
 144 }
 145
 146 static void hdmi_get_timings(struct omap_dss_device *dssdev,
 147                         struct omap_video_timings *timings)
 148 {
 149         mutex_lock(&hdmi.hdmi_lock);
 150
 151         *timings = dssdev->panel.timings;
 152
 153         mutex_unlock(&hdmi.hdmi_lock);
 154 }
 155
 156 static void hdmi_set_timings(struct omap_dss_device *dssdev,
 157                         struct omap_video_timings *timings)
 158 {
 159         DSSDBG("hdmi_set_timings\n");
 160
 161         mutex_lock(&hdmi.hdmi_lock);
 162
 163         dssdev->panel.timings = *timings;
 164         omapdss_hdmi_display_set_timing(dssdev);
 165
 166         mutex_unlock(&hdmi.hdmi_lock);
 167 }
 168
 169 static int hdmi_check_timings(struct omap_dss_device *dssdev,
 170                         struct omap_video_timings *timings)
 171 {
 172         int r = 0;
 173
 174         DSSDBG("hdmi_check_timings\n");
 175
 176         mutex_lock(&hdmi.hdmi_lock);
 177
 178         r = omapdss_hdmi_display_check_timing(dssdev, timings);
 179         if (r) {
 180                 DSSERR("Timing cannot be applied\n");
 181                 goto err;
 182         }
 183 err:
 184         mutex_unlock(&hdmi.hdmi_lock);
 185         return r;
 186 }
 187
 188 static struct omap_dss_driver hdmi_driver = {
 189         .probe          = hdmi_panel_probe,
 190         .remove         = hdmi_panel_remove,
 191         .enable         = hdmi_panel_enable,
 192         .disable        = hdmi_panel_disable,
 193         .suspend        = hdmi_panel_suspend,
 194         .resume         = hdmi_panel_resume,
 195         .get_timings    = hdmi_get_timings,
 196         .set_timings    = hdmi_set_timings,
 197         .check_timings  = hdmi_check_timings,
 198         .driver                 = {
 199                 .name   = "hdmi_panel",
 200                 .owner  = THIS_MODULE,
 201         },
 202 };
 203
 204 int hdmi_panel_init(void)
 205 {
 206         mutex_init(&hdmi.hdmi_lock);
 207
 208         omap_dss_register_driver(&hdmi_driver);
 209
 210         return 0;
 211 }
 212
 213 void hdmi_panel_exit(void)
 214 {
 215         omap_dss_unregister_driver(&hdmi_driver);
 216
 217 }