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