kernel/drivers/video/fbdev/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 #include <linux/of.h>
  23
  24 #include <video/omapdss.h>
  25
  26 #include "dss.h"
  27
  28 static LIST_HEAD(output_list);
  29 static DEFINE_MUTEX(output_lock);
  30
  31 int omapdss_output_set_device(struct omap_dss_device *out,
  32                 struct omap_dss_device *dssdev)
  33 {
  34         int r;
  35
  36         mutex_lock(&output_lock);
  37
  38         if (out->dst) {
  39                 DSSERR("output already has device %s connected to it\n",
  40                         out->dst->name);
  41                 r = -EINVAL;
  42                 goto err;
  43         }
  44
  45         if (out->output_type != dssdev->type) {
  46                 DSSERR("output type and display type don't match\n");
  47                 r = -EINVAL;
  48                 goto err;
  49         }
  50
  51         out->dst = dssdev;
  52         dssdev->src = out;
  53
  54         mutex_unlock(&output_lock);
  55
  56         return 0;
  57 err:
  58         mutex_unlock(&output_lock);
  59
  60         return r;
  61 }
  62 EXPORT_SYMBOL(omapdss_output_set_device);
  63
  64 int omapdss_output_unset_device(struct omap_dss_device *out)
  65 {
  66         int r;
  67
  68         mutex_lock(&output_lock);
  69
  70         if (!out->dst) {
  71                 DSSERR("output doesn't have a device connected to it\n");
  72                 r = -EINVAL;
  73                 goto err;
  74         }
  75
  76         if (out->dst->state != OMAP_DSS_DISPLAY_DISABLED) {
  77                 DSSERR("device %s is not disabled, cannot unset device\n",
  78                                 out->dst->name);
  79                 r = -EINVAL;
  80                 goto err;
  81         }
  82
  83         out->dst->src = NULL;
  84         out->dst = NULL;
  85
  86         mutex_unlock(&output_lock);
  87
  88         return 0;
  89 err:
  90         mutex_unlock(&output_lock);
  91
  92         return r;
  93 }
  94 EXPORT_SYMBOL(omapdss_output_unset_device);
  95
  96 int omapdss_register_output(struct omap_dss_device *out)
  97 {
  98         list_add_tail(&out->list, &output_list);
  99         return 0;
 100 }
 101 EXPORT_SYMBOL(omapdss_register_output);
 102
 103 void omapdss_unregister_output(struct omap_dss_device *out)
 104 {
 105         list_del(&out->list);
 106 }
 107 EXPORT_SYMBOL(omapdss_unregister_output);
 108
 109 struct omap_dss_device *omap_dss_get_output(enum omap_dss_output_id id)
 110 {
 111         struct omap_dss_device *out;
 112
 113         list_for_each_entry(out, &output_list, list) {
 114                 if (out->id == id)
 115                         return out;
 116         }
 117
 118         return NULL;
 119 }
 120 EXPORT_SYMBOL(omap_dss_get_output);
 121
 122 struct omap_dss_device *omap_dss_find_output(const char *name)
 123 {
 124         struct omap_dss_device *out;
 125
 126         list_for_each_entry(out, &output_list, list) {
 127                 if (strcmp(out->name, name) == 0)
 128                         return omap_dss_get_device(out);
 129         }
 130
 131         return NULL;
 132 }
 133 EXPORT_SYMBOL(omap_dss_find_output);
 134
 135 struct omap_dss_device *omap_dss_find_output_by_port_node(struct device_node *port)
 136 {
 137         struct device_node *src_node;
 138         struct omap_dss_device *out;
 139         u32 reg;
 140
 141         src_node = dss_of_port_get_parent_device(port);
 142         if (!src_node)
 143                 return NULL;
 144
 145         reg = dss_of_port_get_port_number(port);
 146
 147         list_for_each_entry(out, &output_list, list) {
 148                 if (out->dev->of_node == src_node && out->port_num == reg) {
 149                         of_node_put(src_node);
 150                         return omap_dss_get_device(out);
 151                 }
 152         }
 153
 154         of_node_put(src_node);
 155
 156         return NULL;
 157 }
 158 EXPORT_SYMBOL(omap_dss_find_output_by_port_node);
 159
 160 struct omap_dss_device *omapdss_find_output_from_display(struct omap_dss_device *dssdev)
 161 {
 162         while (dssdev->src)
 163                 dssdev = dssdev->src;
 164
 165         if (dssdev->id != 0)
 166                 return omap_dss_get_device(dssdev);
 167
 168         return NULL;
 169 }
 170 EXPORT_SYMBOL(omapdss_find_output_from_display);
 171
 172 struct omap_overlay_manager *omapdss_find_mgr_from_display(struct omap_dss_device *dssdev)
 173 {
 174         struct omap_dss_device *out;
 175         struct omap_overlay_manager *mgr;
 176
 177         out = omapdss_find_output_from_display(dssdev);
 178
 179         if (out == NULL)
 180                 return NULL;
 181
 182         mgr = out->manager;
 183
 184         omap_dss_put_device(out);
 185
 186         return mgr;
 187 }
 188 EXPORT_SYMBOL(omapdss_find_mgr_from_display);
 189
 190 static const struct dss_mgr_ops *dss_mgr_ops;
 191
 192 int dss_install_mgr_ops(const struct dss_mgr_ops *mgr_ops)
 193 {
 194         if (dss_mgr_ops)
 195                 return -EBUSY;
 196
 197         dss_mgr_ops = mgr_ops;
 198
 199         return 0;
 200 }
 201 EXPORT_SYMBOL(dss_install_mgr_ops);
 202
 203 void dss_uninstall_mgr_ops(void)
 204 {
 205         dss_mgr_ops = NULL;
 206 }
 207 EXPORT_SYMBOL(dss_uninstall_mgr_ops);
 208
 209 int dss_mgr_connect(struct omap_overlay_manager *mgr,
 210                 struct omap_dss_device *dst)
 211 {
 212         return dss_mgr_ops->connect(mgr, dst);
 213 }
 214 EXPORT_SYMBOL(dss_mgr_connect);
 215
 216 void dss_mgr_disconnect(struct omap_overlay_manager *mgr,
 217                 struct omap_dss_device *dst)
 218 {
 219         dss_mgr_ops->disconnect(mgr, dst);
 220 }
 221 EXPORT_SYMBOL(dss_mgr_disconnect);
 222
 223 void dss_mgr_set_timings(struct omap_overlay_manager *mgr,
 224                 const struct omap_video_timings *timings)
 225 {
 226         dss_mgr_ops->set_timings(mgr, timings);
 227 }
 228 EXPORT_SYMBOL(dss_mgr_set_timings);
 229
 230 void dss_mgr_set_lcd_config(struct omap_overlay_manager *mgr,
 231                 const struct dss_lcd_mgr_config *config)
 232 {
 233         dss_mgr_ops->set_lcd_config(mgr, config);
 234 }
 235 EXPORT_SYMBOL(dss_mgr_set_lcd_config);
 236
 237 int dss_mgr_enable(struct omap_overlay_manager *mgr)
 238 {
 239         return dss_mgr_ops->enable(mgr);
 240 }
 241 EXPORT_SYMBOL(dss_mgr_enable);
 242
 243 void dss_mgr_disable(struct omap_overlay_manager *mgr)
 244 {
 245         dss_mgr_ops->disable(mgr);
 246 }
 247 EXPORT_SYMBOL(dss_mgr_disable);
 248
 249 void dss_mgr_start_update(struct omap_overlay_manager *mgr)
 250 {
 251         dss_mgr_ops->start_update(mgr);
 252 }
 253 EXPORT_SYMBOL(dss_mgr_start_update);
 254
 255 int dss_mgr_register_framedone_handler(struct omap_overlay_manager *mgr,
 256                 void (*handler)(void *), void *data)
 257 {
 258         return dss_mgr_ops->register_framedone_handler(mgr, handler, data);
 259 }
 260 EXPORT_SYMBOL(dss_mgr_register_framedone_handler);
 261
 262 void dss_mgr_unregister_framedone_handler(struct omap_overlay_manager *mgr,
 263                 void (*handler)(void *), void *data)
 264 {
 265         dss_mgr_ops->unregister_framedone_handler(mgr, handler, data);
 266 }
 267 EXPORT_SYMBOL(dss_mgr_unregister_framedone_handler);