1/*
  2 * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
  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
 26static LIST_HEAD(output_list);
 27static DEFINE_MUTEX(output_lock);
 28
 29int 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;
 56err:
 57	mutex_unlock(&output_lock);
 58
 59	return r;
 60}
 61EXPORT_SYMBOL(omapdss_output_set_device);
 62
 63int 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;
 90err:
 91	mutex_unlock(&output_lock);
 92
 93	return r;
 94}
 95EXPORT_SYMBOL(omapdss_output_unset_device);
 96
 97int omapdss_register_output(struct omap_dss_device *out)
 98{
 99	list_add_tail(&out->list, &output_list);
100	return 0;
101}
102EXPORT_SYMBOL(omapdss_register_output);
103
104void omapdss_unregister_output(struct omap_dss_device *out)
105{
106	list_del(&out->list);
107}
108EXPORT_SYMBOL(omapdss_unregister_output);
109
110bool 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}
121EXPORT_SYMBOL(omapdss_component_is_output);
122
123struct 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}
134EXPORT_SYMBOL(omap_dss_get_output);
135
136struct 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
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;
173static struct omap_drm_private *dss_mgr_ops_priv;
174
175int dss_install_mgr_ops(const struct dss_mgr_ops *mgr_ops,
176			struct omap_drm_private *priv)
177{
178	if (dss_mgr_ops)
179		return -EBUSY;
180
181	dss_mgr_ops = mgr_ops;
182	dss_mgr_ops_priv = priv;
183
184	return 0;
185}
186EXPORT_SYMBOL(dss_install_mgr_ops);
187
188void dss_uninstall_mgr_ops(void)
189{
190	dss_mgr_ops = NULL;
191	dss_mgr_ops_priv = NULL;
192}
193EXPORT_SYMBOL(dss_uninstall_mgr_ops);
194
195int dss_mgr_connect(struct omap_dss_device *dssdev, struct omap_dss_device *dst)
196{
197	return dss_mgr_ops->connect(dss_mgr_ops_priv,
198				    dssdev->dispc_channel, dst);
199}
200EXPORT_SYMBOL(dss_mgr_connect);
201
202void dss_mgr_disconnect(struct omap_dss_device *dssdev,
203			struct omap_dss_device *dst)
204{
205	dss_mgr_ops->disconnect(dss_mgr_ops_priv, dssdev->dispc_channel, dst);
206}
207EXPORT_SYMBOL(dss_mgr_disconnect);
208
209void dss_mgr_set_timings(struct omap_dss_device *dssdev,
210			 const struct videomode *vm)
211{
212	dss_mgr_ops->set_timings(dss_mgr_ops_priv, dssdev->dispc_channel, vm);
213}
214EXPORT_SYMBOL(dss_mgr_set_timings);
215
216void dss_mgr_set_lcd_config(struct omap_dss_device *dssdev,
217		const struct dss_lcd_mgr_config *config)
218{
219	dss_mgr_ops->set_lcd_config(dss_mgr_ops_priv,
220				    dssdev->dispc_channel, config);
221}
222EXPORT_SYMBOL(dss_mgr_set_lcd_config);
223
224int dss_mgr_enable(struct omap_dss_device *dssdev)
225{
226	return dss_mgr_ops->enable(dss_mgr_ops_priv, dssdev->dispc_channel);
227}
228EXPORT_SYMBOL(dss_mgr_enable);
229
230void dss_mgr_disable(struct omap_dss_device *dssdev)
231{
232	dss_mgr_ops->disable(dss_mgr_ops_priv, dssdev->dispc_channel);
233}
234EXPORT_SYMBOL(dss_mgr_disable);
235
236void dss_mgr_start_update(struct omap_dss_device *dssdev)
237{
238	dss_mgr_ops->start_update(dss_mgr_ops_priv, dssdev->dispc_channel);
239}
240EXPORT_SYMBOL(dss_mgr_start_update);
241
242int dss_mgr_register_framedone_handler(struct omap_dss_device *dssdev,
243		void (*handler)(void *), void *data)
244{
245	return dss_mgr_ops->register_framedone_handler(dss_mgr_ops_priv,
246						       dssdev->dispc_channel,
247						       handler, data);
248}
249EXPORT_SYMBOL(dss_mgr_register_framedone_handler);
250
251void dss_mgr_unregister_framedone_handler(struct omap_dss_device *dssdev,
252		void (*handler)(void *), void *data)
253{
254	dss_mgr_ops->unregister_framedone_handler(dss_mgr_ops_priv,
255						  dssdev->dispc_channel,
256						  handler, data);
257}
258EXPORT_SYMBOL(dss_mgr_unregister_framedone_handler);