drivers/video/omap2/dss/output.c

   1 /*
   2  * Copyright (C) 2012 Texas Instruments Ltd
   3  * Author: Archit Taneja <archit@ti.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 as published by
   7  * the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <linux/kernel.h>
  19 #include <linux/module.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/slab.h>
  22
  23 #include <video/omapdss.h>
  24
  25 #include "dss.h"
  26
  27 static LIST_HEAD(output_list);
  28 static DEFINE_MUTEX(output_lock);
  29
  30 int omapdss_output_set_device(struct omap_dss_output *out,
  31                 struct omap_dss_device *dssdev)
  32 {
  33         int r;
  34
  35         mutex_lock(&output_lock);
  36
  37         if (out->device) {
  38                 DSSERR("output already has device %s connected to it\n",
  39                         out->device->name);
  40                 r = -EINVAL;
  41                 goto err;
  42         }
  43
  44         if (out->type != dssdev->type) {
  45                 DSSERR("output type and display type don't match\n");
  46                 r = -EINVAL;
  47                 goto err;
  48         }
  49
  50         out->device = dssdev;
  51         dssdev->output = out;
  52
  53         mutex_unlock(&output_lock);
  54
  55         return 0;
  56 err:
  57         mutex_unlock(&output_lock);
  58
  59         return r;
  60 }
  61 EXPORT_SYMBOL(omapdss_output_set_device);
  62
  63 int omapdss_output_unset_device(struct omap_dss_output *out)
  64 {
  65         int r;
  66
  67         mutex_lock(&output_lock);
  68
  69         if (!out->device) {
  70                 DSSERR("output doesn't have a device connected to it\n");
  71                 r = -EINVAL;
  72                 goto err;
  73         }
  74
  75         if (out->device->state != OMAP_DSS_DISPLAY_DISABLED) {
  76                 DSSERR("device %s is not disabled, cannot unset device\n",
  77                                 out->device->name);
  78                 r = -EINVAL;
  79                 goto err;
  80         }
  81
  82         out->device->output = NULL;
  83         out->device = NULL;
  84
  85         mutex_unlock(&output_lock);
  86
  87         return 0;
  88 err:
  89         mutex_unlock(&output_lock);
  90
  91         return r;
  92 }
  93 EXPORT_SYMBOL(omapdss_output_unset_device);
  94
  95 void dss_register_output(struct omap_dss_output *out)
  96 {
  97         list_add_tail(&out->list, &output_list);
  98 }
  99
 100 void dss_unregister_output(struct omap_dss_output *out)
 101 {
 102         list_del(&out->list);
 103 }
 104
 105 struct omap_dss_output *omap_dss_get_output(enum omap_dss_output_id id)
 106 {
 107         struct omap_dss_output *out;
 108
 109         list_for_each_entry(out, &output_list, list) {
 110                 if (out->id == id)
 111                         return out;
 112         }
 113
 114         return NULL;
 115 }
 116
 117 struct omap_dss_output *omapdss_get_output_from_dssdev(struct omap_dss_device *dssdev)
 118 {
 119         struct omap_dss_output *out = NULL;
 120         enum omap_dss_output_id id;
 121
 122         switch (dssdev->type) {
 123         case OMAP_DISPLAY_TYPE_DPI:
 124                 out = omap_dss_get_output(OMAP_DSS_OUTPUT_DPI);
 125                 break;
 126         case OMAP_DISPLAY_TYPE_DBI:
 127                 out = omap_dss_get_output(OMAP_DSS_OUTPUT_DBI);
 128                 break;
 129         case OMAP_DISPLAY_TYPE_SDI:
 130                 out = omap_dss_get_output(OMAP_DSS_OUTPUT_SDI);
 131                 break;
 132         case OMAP_DISPLAY_TYPE_VENC:
 133                 out = omap_dss_get_output(OMAP_DSS_OUTPUT_VENC);
 134                 break;
 135         case OMAP_DISPLAY_TYPE_HDMI:
 136                 out = omap_dss_get_output(OMAP_DSS_OUTPUT_HDMI);
 137                 break;
 138         case OMAP_DISPLAY_TYPE_DSI:
 139                 id = dssdev->phy.dsi.module == 0 ? OMAP_DSS_OUTPUT_DSI1 :
 140                                         OMAP_DSS_OUTPUT_DSI2;
 141                 out = omap_dss_get_output(id);
 142                 break;
 143         default:
 144                 break;
 145         }
 146
 147         return out;
 148 }