1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2012 Texas Instruments Ltd
4 * Author: Archit Taneja <archit@ti.com>
5 */
6
7#include <linux/kernel.h>
8#include <linux/module.h>
9#include <linux/platform_device.h>
10#include <linux/slab.h>
11#include <linux/of.h>
12
13#include <video/omapfb_dss.h>
14
15#include "dss.h"
16
17static LIST_HEAD(output_list);
18static DEFINE_MUTEX(output_lock);
19
20int omapdss_output_set_device(struct omap_dss_device *out,
21		struct omap_dss_device *dssdev)
22{
23	int r;
24
25	mutex_lock(&output_lock);
26
27	if (out->dst) {
28		DSSERR("output already has device %s connected to it\n",
29			out->dst->name);
30		r = -EINVAL;
31		goto err;
32	}
33
34	if (out->output_type != dssdev->type) {
35		DSSERR("output type and display type don't match\n");
36		r = -EINVAL;
37		goto err;
38	}
39
40	out->dst = dssdev;
41	dssdev->src = out;
42
43	mutex_unlock(&output_lock);
44
45	return 0;
46err:
47	mutex_unlock(&output_lock);
48
49	return r;
50}
51EXPORT_SYMBOL(omapdss_output_set_device);
52
53int omapdss_output_unset_device(struct omap_dss_device *out)
54{
55	int r;
56
57	mutex_lock(&output_lock);
58
59	if (!out->dst) {
60		DSSERR("output doesn't have a device connected to it\n");
61		r = -EINVAL;
62		goto err;
63	}
64
65	if (out->dst->state != OMAP_DSS_DISPLAY_DISABLED) {
66		DSSERR("device %s is not disabled, cannot unset device\n",
67				out->dst->name);
68		r = -EINVAL;
69		goto err;
70	}
71
72	out->dst->src = NULL;
73	out->dst = NULL;
74
75	mutex_unlock(&output_lock);
76
77	return 0;
78err:
79	mutex_unlock(&output_lock);
80
81	return r;
82}
83EXPORT_SYMBOL(omapdss_output_unset_device);
84
85int omapdss_register_output(struct omap_dss_device *out)
86{
87	list_add_tail(&out->list, &output_list);
88	return 0;
89}
90EXPORT_SYMBOL(omapdss_register_output);
91
92void omapdss_unregister_output(struct omap_dss_device *out)
93{
94	list_del(&out->list);
95}
96EXPORT_SYMBOL(omapdss_unregister_output);
97
98struct omap_dss_device *omap_dss_get_output(enum omap_dss_output_id id)
99{
100	struct omap_dss_device *out;
101
102	list_for_each_entry(out, &output_list, list) {
103		if (out->id == id)
104			return out;
105	}
106
107	return NULL;
108}
109EXPORT_SYMBOL(omap_dss_get_output);
110
111struct omap_dss_device *omap_dss_find_output(const char *name)
112{
113	struct omap_dss_device *out;
114
115	list_for_each_entry(out, &output_list, list) {
116		if (strcmp(out->name, name) == 0)
117			return omap_dss_get_device(out);
118	}
119
120	return NULL;
121}
122EXPORT_SYMBOL(omap_dss_find_output);
123
124struct omap_dss_device *omap_dss_find_output_by_port_node(struct device_node *port)
125{
126	struct device_node *src_node;
127	struct omap_dss_device *out;
128	u32 reg;
129
130	src_node = dss_of_port_get_parent_device(port);
131	if (!src_node)
132		return NULL;
133
134	reg = dss_of_port_get_port_number(port);
135
136	list_for_each_entry(out, &output_list, list) {
137		if (out->dev->of_node == src_node && out->port_num == reg) {
138			of_node_put(src_node);
139			return omap_dss_get_device(out);
140		}
141	}
142
143	of_node_put(src_node);
144
145	return NULL;
146}
147EXPORT_SYMBOL(omap_dss_find_output_by_port_node);
148
149struct omap_dss_device *omapdss_find_output_from_display(struct omap_dss_device *dssdev)
150{
151	while (dssdev->src)
152		dssdev = dssdev->src;
153
154	if (dssdev->id != 0)
155		return omap_dss_get_device(dssdev);
156
157	return NULL;
158}
159EXPORT_SYMBOL(omapdss_find_output_from_display);
160
161struct omap_overlay_manager *omapdss_find_mgr_from_display(struct omap_dss_device *dssdev)
162{
163	struct omap_dss_device *out;
164	struct omap_overlay_manager *mgr;
165
166	out = omapdss_find_output_from_display(dssdev);
167
168	if (out == NULL)
169		return NULL;
170
171	mgr = out->manager;
172
173	omap_dss_put_device(out);
174
175	return mgr;
176}
177EXPORT_SYMBOL(omapdss_find_mgr_from_display);
178
179static const struct dss_mgr_ops *dss_mgr_ops;
180
181int dss_install_mgr_ops(const struct dss_mgr_ops *mgr_ops)
182{
183	if (dss_mgr_ops)
184		return -EBUSY;
185
186	dss_mgr_ops = mgr_ops;
187
188	return 0;
189}
190EXPORT_SYMBOL(dss_install_mgr_ops);
191
192void dss_uninstall_mgr_ops(void)
193{
194	dss_mgr_ops = NULL;
195}
196EXPORT_SYMBOL(dss_uninstall_mgr_ops);
197
198int dss_mgr_connect(struct omap_overlay_manager *mgr,
199		struct omap_dss_device *dst)
200{
201	return dss_mgr_ops->connect(mgr, dst);
202}
203EXPORT_SYMBOL(dss_mgr_connect);
204
205void dss_mgr_disconnect(struct omap_overlay_manager *mgr,
206		struct omap_dss_device *dst)
207{
208	dss_mgr_ops->disconnect(mgr, dst);
209}
210EXPORT_SYMBOL(dss_mgr_disconnect);
211
212void dss_mgr_set_timings(struct omap_overlay_manager *mgr,
213		const struct omap_video_timings *timings)
214{
215	dss_mgr_ops->set_timings(mgr, timings);
216}
217EXPORT_SYMBOL(dss_mgr_set_timings);
218
219void dss_mgr_set_lcd_config(struct omap_overlay_manager *mgr,
220		const struct dss_lcd_mgr_config *config)
221{
222	dss_mgr_ops->set_lcd_config(mgr, config);
223}
224EXPORT_SYMBOL(dss_mgr_set_lcd_config);
225
226int dss_mgr_enable(struct omap_overlay_manager *mgr)
227{
228	return dss_mgr_ops->enable(mgr);
229}
230EXPORT_SYMBOL(dss_mgr_enable);
231
232void dss_mgr_disable(struct omap_overlay_manager *mgr)
233{
234	dss_mgr_ops->disable(mgr);
235}
236EXPORT_SYMBOL(dss_mgr_disable);
237
238void dss_mgr_start_update(struct omap_overlay_manager *mgr)
239{
240	dss_mgr_ops->start_update(mgr);
241}
242EXPORT_SYMBOL(dss_mgr_start_update);
243
244int dss_mgr_register_framedone_handler(struct omap_overlay_manager *mgr,
245		void (*handler)(void *), void *data)
246{
247	return dss_mgr_ops->register_framedone_handler(mgr, handler, data);
248}
249EXPORT_SYMBOL(dss_mgr_register_framedone_handler);
250
251void dss_mgr_unregister_framedone_handler(struct omap_overlay_manager *mgr,
252		void (*handler)(void *), void *data)
253{
254	dss_mgr_ops->unregister_framedone_handler(mgr, handler, data);
255}
256EXPORT_SYMBOL(dss_mgr_unregister_framedone_handler);
257