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
 28static LIST_HEAD(output_list);
 29static DEFINE_MUTEX(output_lock);
 30
 31int 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;
 57err:
 58	mutex_unlock(&output_lock);
 59
 60	return r;
 61}
 62EXPORT_SYMBOL(omapdss_output_set_device);
 63
 64int 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;
 89err:
 90	mutex_unlock(&output_lock);
 91
 92	return r;
 93}
 94EXPORT_SYMBOL(omapdss_output_unset_device);
 95
 96int omapdss_register_output(struct omap_dss_device *out)
 97{
 98	list_add_tail(&out->list, &output_list);
 99	return 0;
100}
101EXPORT_SYMBOL(omapdss_register_output);
102
103void omapdss_unregister_output(struct omap_dss_device *out)
104{
105	list_del(&out->list);
106}
107EXPORT_SYMBOL(omapdss_unregister_output);
108
109struct 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}
120EXPORT_SYMBOL(omap_dss_get_output);
121
122struct 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}
133EXPORT_SYMBOL(omap_dss_find_output);
134
135struct 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}
158EXPORT_SYMBOL(omap_dss_find_output_by_port_node);
159
160struct 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}
170EXPORT_SYMBOL(omapdss_find_output_from_display);
171
172static const struct dss_mgr_ops *dss_mgr_ops;
173
174int dss_install_mgr_ops(const struct dss_mgr_ops *mgr_ops)
175{
176	if (dss_mgr_ops)
177		return -EBUSY;
178
179	dss_mgr_ops = mgr_ops;
180
181	return 0;
182}
183EXPORT_SYMBOL(dss_install_mgr_ops);
184
185void dss_uninstall_mgr_ops(void)
186{
187	dss_mgr_ops = NULL;
188}
189EXPORT_SYMBOL(dss_uninstall_mgr_ops);
190
191int dss_mgr_connect(enum omap_channel channel,
192		struct omap_dss_device *dst)
193{
194	return dss_mgr_ops->connect(channel, dst);
195}
196EXPORT_SYMBOL(dss_mgr_connect);
197
198void dss_mgr_disconnect(enum omap_channel channel,
199		struct omap_dss_device *dst)
200{
201	dss_mgr_ops->disconnect(channel, dst);
202}
203EXPORT_SYMBOL(dss_mgr_disconnect);
204
205void dss_mgr_set_timings(enum omap_channel channel,
206		const struct omap_video_timings *timings)
207{
208	dss_mgr_ops->set_timings(channel, timings);
209}
210EXPORT_SYMBOL(dss_mgr_set_timings);
211
212void 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}
217EXPORT_SYMBOL(dss_mgr_set_lcd_config);
218
219int dss_mgr_enable(enum omap_channel channel)
220{
221	return dss_mgr_ops->enable(channel);
222}
223EXPORT_SYMBOL(dss_mgr_enable);
224
225void dss_mgr_disable(enum omap_channel channel)
226{
227	dss_mgr_ops->disable(channel);
228}
229EXPORT_SYMBOL(dss_mgr_disable);
230
231void dss_mgr_start_update(enum omap_channel channel)
232{
233	dss_mgr_ops->start_update(channel);
234}
235EXPORT_SYMBOL(dss_mgr_start_update);
236
237int 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}
242EXPORT_SYMBOL(dss_mgr_register_framedone_handler);
243
244void 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}
249EXPORT_SYMBOL(dss_mgr_unregister_framedone_handler);