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 #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_device *out,
  31                 struct omap_dss_device *dssdev)
  32 {
  33         int r;
  34
  35         mutex_lock(&output_lock);
  36
  37         if (out->dst) {
  38                 DSSERR("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                 DSSERR("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                 DSSERR("output doesn't have a device connected to it\n");
  71                 r = -EINVAL;
  72                 goto err;
  73         }
  74
  75         if (out->dst->state != OMAP_DSS_DISPLAY_DISABLED) {
  76                 DSSERR("device %s is not disabled, cannot unset device\n",
  77                                 out->dst->name);
  78                 r = -EINVAL;
  79                 goto err;
  80         }
  81
  82         out->dst->src = NULL;
  83         out->dst = 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 int omapdss_register_output(struct omap_dss_device *out)
  96 {
  97         list_add_tail(&out->list, &output_list);
  98         return 0;
  99 }
 100 EXPORT_SYMBOL(omapdss_register_output);
 101
 102 void omapdss_unregister_output(struct omap_dss_device *out)
 103 {
 104         list_del(&out->list);
 105 }
 106 EXPORT_SYMBOL(omapdss_unregister_output);
 107
 108 struct omap_dss_device *omap_dss_get_output(enum omap_dss_output_id id)
 109 {
 110         struct omap_dss_device *out;
 111
 112         list_for_each_entry(out, &output_list, list) {
 113                 if (out->id == id)
 114                         return out;
 115         }
 116
 117         return NULL;
 118 }
 119 EXPORT_SYMBOL(omap_dss_get_output);
 120
 121 struct omap_dss_device *omap_dss_find_output(const char *name)
 122 {
 123         struct omap_dss_device *out;
 124
 125         list_for_each_entry(out, &output_list, list) {
 126                 if (strcmp(out->name, name) == 0)
 127                         return omap_dss_get_device(out);
 128         }
 129
 130         return NULL;
 131 }
 132 EXPORT_SYMBOL(omap_dss_find_output);
 133
 134 struct omap_dss_device *omap_dss_find_output_by_port_node(struct device_node *port)
 135 {
 136         struct device_node *src_node;
 137         struct omap_dss_device *out;
 138         u32 reg;
 139
 140         src_node = dss_of_port_get_parent_device(port);
 141         if (!src_node)
 142                 return NULL;
 143
 144         reg = dss_of_port_get_port_number(port);
 145
 146         list_for_each_entry(out, &output_list, list) {
 147                 if (out->dev->of_node == src_node && out->port_num == reg) {
 148                         of_node_put(src_node);
 149                         return omap_dss_get_device(out);
 150                 }
 151         }
 152
 153         of_node_put(src_node);
 154
 155         return NULL;
 156 }
 157 EXPORT_SYMBOL(omap_dss_find_output_by_port_node);
 158
 159 struct omap_dss_device *omapdss_find_output_from_display(struct omap_dss_device *dssdev)
 160 {
 161         while (dssdev->src)
 162                 dssdev = dssdev->src;
 163
 164         if (dssdev->id != 0)
 165                 return omap_dss_get_device(dssdev);
 166
 167         return NULL;
 168 }
 169 EXPORT_SYMBOL(omapdss_find_output_from_display);
 170
 171 static const struct dss_mgr_ops *dss_mgr_ops;
 172
 173 int dss_install_mgr_ops(const struct dss_mgr_ops *mgr_ops)
 174 {
 175         if (dss_mgr_ops)
 176                 return -EBUSY;
 177
 178         dss_mgr_ops = mgr_ops;
 179
 180         return 0;
 181 }
 182 EXPORT_SYMBOL(dss_install_mgr_ops);
 183
 184 void dss_uninstall_mgr_ops(void)
 185 {
 186         dss_mgr_ops = NULL;
 187 }
 188 EXPORT_SYMBOL(dss_uninstall_mgr_ops);
 189
 190 int dss_mgr_connect(enum omap_channel channel,
 191                 struct omap_dss_device *dst)
 192 {
 193         return dss_mgr_ops->connect(channel, dst);
 194 }
 195 EXPORT_SYMBOL(dss_mgr_connect);
 196
 197 void dss_mgr_disconnect(enum omap_channel channel,
 198                 struct omap_dss_device *dst)
 199 {
 200         dss_mgr_ops->disconnect(channel, dst);
 201 }
 202 EXPORT_SYMBOL(dss_mgr_disconnect);
 203
 204 void dss_mgr_set_timings(enum omap_channel channel,
 205                 const struct omap_video_timings *timings)
 206 {
 207         dss_mgr_ops->set_timings(channel, timings);
 208 }
 209 EXPORT_SYMBOL(dss_mgr_set_timings);
 210
 211 void dss_mgr_set_lcd_config(enum omap_channel channel,
 212                 const struct dss_lcd_mgr_config *config)
 213 {
 214         dss_mgr_ops->set_lcd_config(channel, config);
 215 }
 216 EXPORT_SYMBOL(dss_mgr_set_lcd_config);
 217
 218 int dss_mgr_enable(enum omap_channel channel)
 219 {
 220         return dss_mgr_ops->enable(channel);
 221 }
 222 EXPORT_SYMBOL(dss_mgr_enable);
 223
 224 void dss_mgr_disable(enum omap_channel channel)
 225 {
 226         dss_mgr_ops->disable(channel);
 227 }
 228 EXPORT_SYMBOL(dss_mgr_disable);
 229
 230 void dss_mgr_start_update(enum omap_channel channel)
 231 {
 232         dss_mgr_ops->start_update(channel);
 233 }
 234 EXPORT_SYMBOL(dss_mgr_start_update);
 235
 236 int dss_mgr_register_framedone_handler(enum omap_channel channel,
 237                 void (*handler)(void *), void *data)
 238 {
 239         return dss_mgr_ops->register_framedone_handler(channel, handler, data);
 240 }
 241 EXPORT_SYMBOL(dss_mgr_register_framedone_handler);
 242
 243 void dss_mgr_unregister_framedone_handler(enum omap_channel channel,
 244                 void (*handler)(void *), void *data)
 245 {
 246         dss_mgr_ops->unregister_framedone_handler(channel, handler, data);
 247 }
 248 EXPORT_SYMBOL(dss_mgr_unregister_framedone_handler);