1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
|
/*
* Copyright (C) 2009 Nokia Corporation
* Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
*
* Some code and ideas taken from drivers/video/omap/ driver
* by Imre Deak.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
#define DSS_SUBSYS_NAME "DISPLAY"
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/jiffies.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include "omapdss.h"
static void omapdss_default_get_timings(struct omap_dss_device *dssdev,
struct videomode *vm)
{
*vm = dssdev->panel.vm;
}
static LIST_HEAD(panel_list);
static DEFINE_MUTEX(panel_list_mutex);
static int disp_num_counter;
int omapdss_register_display(struct omap_dss_device *dssdev)
{
struct omap_dss_driver *drv = dssdev->driver;
struct list_head *cur;
int id;
/*
* Note: this presumes that all displays either have an DT alias, or
* none has.
*/
id = of_alias_get_id(dssdev->dev->of_node, "display");
if (id < 0)
id = disp_num_counter++;
snprintf(dssdev->alias, sizeof(dssdev->alias), "display%d", id);
/* Use 'label' property for name, if it exists */
of_property_read_string(dssdev->dev->of_node, "label", &dssdev->name);
if (dssdev->name == NULL)
dssdev->name = dssdev->alias;
if (drv && drv->get_timings == NULL)
drv->get_timings = omapdss_default_get_timings;
mutex_lock(&panel_list_mutex);
list_for_each(cur, &panel_list) {
struct omap_dss_device *ldev = list_entry(cur,
struct omap_dss_device,
panel_list);
if (strcmp(ldev->alias, dssdev->alias) > 0)
break;
}
list_add_tail(&dssdev->panel_list, cur);
mutex_unlock(&panel_list_mutex);
return 0;
}
EXPORT_SYMBOL(omapdss_register_display);
void omapdss_unregister_display(struct omap_dss_device *dssdev)
{
mutex_lock(&panel_list_mutex);
list_del(&dssdev->panel_list);
mutex_unlock(&panel_list_mutex);
}
EXPORT_SYMBOL(omapdss_unregister_display);
bool omapdss_component_is_display(struct device_node *node)
{
struct omap_dss_device *dssdev;
bool found = false;
mutex_lock(&panel_list_mutex);
list_for_each_entry(dssdev, &panel_list, panel_list) {
if (dssdev->dev->of_node == node) {
found = true;
goto out;
}
}
out:
mutex_unlock(&panel_list_mutex);
return found;
}
EXPORT_SYMBOL(omapdss_component_is_display);
struct omap_dss_device *omap_dss_get_device(struct omap_dss_device *dssdev)
{
if (!try_module_get(dssdev->owner))
return NULL;
if (get_device(dssdev->dev) == NULL) {
module_put(dssdev->owner);
return NULL;
}
return dssdev;
}
EXPORT_SYMBOL(omap_dss_get_device);
void omap_dss_put_device(struct omap_dss_device *dssdev)
{
put_device(dssdev->dev);
module_put(dssdev->owner);
}
EXPORT_SYMBOL(omap_dss_put_device);
/*
* ref count of the found device is incremented.
* ref count of from-device is decremented.
*/
struct omap_dss_device *omap_dss_get_next_device(struct omap_dss_device *from)
{
struct list_head *l;
struct omap_dss_device *dssdev;
mutex_lock(&panel_list_mutex);
if (list_empty(&panel_list)) {
dssdev = NULL;
goto out;
}
if (from == NULL) {
dssdev = list_first_entry(&panel_list, struct omap_dss_device,
panel_list);
omap_dss_get_device(dssdev);
goto out;
}
omap_dss_put_device(from);
list_for_each(l, &panel_list) {
dssdev = list_entry(l, struct omap_dss_device, panel_list);
if (dssdev == from) {
if (list_is_last(l, &panel_list)) {
dssdev = NULL;
goto out;
}
dssdev = list_entry(l->next, struct omap_dss_device,
panel_list);
omap_dss_get_device(dssdev);
goto out;
}
}
WARN(1, "'from' dssdev not found\n");
dssdev = NULL;
out:
mutex_unlock(&panel_list_mutex);
return dssdev;
}
EXPORT_SYMBOL(omap_dss_get_next_device);
|
