1 /*
2  * Copyright (C) 2009 Nokia Corporation
3  * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
4  *
5  * Some code and ideas taken from drivers/video/omap/ driver
6  * by Imre Deak.
7  *
8  * This program is free software; you can redistribute it and/or modify it
9  * under the terms of the GNU General Public License version 2 as published by
10  * the Free Software Foundation.
11  *
12  * This program is distributed in the hope that it will be useful, but WITHOUT
13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
15  * more details.
16  *
17  * You should have received a copy of the GNU General Public License along with
18  * this program.  If not, see <http://www.gnu.org/licenses/>.
19  */
20 
21 #define DSS_SUBSYS_NAME "DISPLAY"
22 
23 #include <linux/kernel.h>
24 #include <linux/module.h>
25 #include <linux/platform_device.h>
26 #include <linux/sysfs.h>
27 
28 #include <video/omapdss.h>
29 #include "dss.h"
30 
31 static ssize_t display_name_show(struct omap_dss_device *dssdev, char *buf)
32 {
33 	return snprintf(buf, PAGE_SIZE, "%s\n",
34 			dssdev->name ?
35 			dssdev->name : "");
36 }
37 
38 static ssize_t display_enabled_show(struct omap_dss_device *dssdev, char *buf)
39 {
40 	return snprintf(buf, PAGE_SIZE, "%d\n",
41 			omapdss_device_is_enabled(dssdev));
42 }
43 
44 static ssize_t display_enabled_store(struct omap_dss_device *dssdev,
45 		const char *buf, size_t size)
46 {
47 	int r;
48 	bool enable;
49 
50 	r = strtobool(buf, &enable);
51 	if (r)
52 		return r;
53 
54 	if (enable == omapdss_device_is_enabled(dssdev))
55 		return size;
56 
57 	if (omapdss_device_is_connected(dssdev) == false)
58 		return -ENODEV;
59 
60 	if (enable) {
61 		r = dssdev->driver->enable(dssdev);
62 		if (r)
63 			return r;
64 	} else {
65 		dssdev->driver->disable(dssdev);
66 	}
67 
68 	return size;
69 }
70 
71 static ssize_t display_tear_show(struct omap_dss_device *dssdev, char *buf)
72 {
73 	return snprintf(buf, PAGE_SIZE, "%d\n",
74 			dssdev->driver->get_te ?
75 			dssdev->driver->get_te(dssdev) : 0);
76 }
77 
78 static ssize_t display_tear_store(struct omap_dss_device *dssdev,
79 	const char *buf, size_t size)
80 {
81 	int r;
82 	bool te;
83 
84 	if (!dssdev->driver->enable_te || !dssdev->driver->get_te)
85 		return -ENOENT;
86 
87 	r = strtobool(buf, &te);
88 	if (r)
89 		return r;
90 
91 	r = dssdev->driver->enable_te(dssdev, te);
92 	if (r)
93 		return r;
94 
95 	return size;
96 }
97 
98 static ssize_t display_timings_show(struct omap_dss_device *dssdev, char *buf)
99 {
100 	struct omap_video_timings t;
101 
102 	if (!dssdev->driver->get_timings)
103 		return -ENOENT;
104 
105 	dssdev->driver->get_timings(dssdev, &t);
106 
107 	return snprintf(buf, PAGE_SIZE, "%u,%u/%u/%u/%u,%u/%u/%u/%u\n",
108 			t.pixelclock,
109 			t.x_res, t.hfp, t.hbp, t.hsw,
110 			t.y_res, t.vfp, t.vbp, t.vsw);
111 }
112 
113 static ssize_t display_timings_store(struct omap_dss_device *dssdev,
114 	const char *buf, size_t size)
115 {
116 	struct omap_video_timings t = dssdev->panel.timings;
117 	int r, found;
118 
119 	if (!dssdev->driver->set_timings || !dssdev->driver->check_timings)
120 		return -ENOENT;
121 
122 	found = 0;
123 #ifdef CONFIG_FB_OMAP2_DSS_VENC
124 	if (strncmp("pal", buf, 3) == 0) {
125 		t = omap_dss_pal_timings;
126 		found = 1;
127 	} else if (strncmp("ntsc", buf, 4) == 0) {
128 		t = omap_dss_ntsc_timings;
129 		found = 1;
130 	}
131 #endif
132 	if (!found && sscanf(buf, "%u,%hu/%hu/%hu/%hu,%hu/%hu/%hu/%hu",
133 				&t.pixelclock,
134 				&t.x_res, &t.hfp, &t.hbp, &t.hsw,
135 				&t.y_res, &t.vfp, &t.vbp, &t.vsw) != 9)
136 		return -EINVAL;
137 
138 	r = dssdev->driver->check_timings(dssdev, &t);
139 	if (r)
140 		return r;
141 
142 	dssdev->driver->disable(dssdev);
143 	dssdev->driver->set_timings(dssdev, &t);
144 	r = dssdev->driver->enable(dssdev);
145 	if (r)
146 		return r;
147 
148 	return size;
149 }
150 
151 static ssize_t display_rotate_show(struct omap_dss_device *dssdev, char *buf)
152 {
153 	int rotate;
154 	if (!dssdev->driver->get_rotate)
155 		return -ENOENT;
156 	rotate = dssdev->driver->get_rotate(dssdev);
157 	return snprintf(buf, PAGE_SIZE, "%u\n", rotate);
158 }
159 
160 static ssize_t display_rotate_store(struct omap_dss_device *dssdev,
161 	const char *buf, size_t size)
162 {
163 	int rot, r;
164 
165 	if (!dssdev->driver->set_rotate || !dssdev->driver->get_rotate)
166 		return -ENOENT;
167 
168 	r = kstrtoint(buf, 0, &rot);
169 	if (r)
170 		return r;
171 
172 	r = dssdev->driver->set_rotate(dssdev, rot);
173 	if (r)
174 		return r;
175 
176 	return size;
177 }
178 
179 static ssize_t display_mirror_show(struct omap_dss_device *dssdev, char *buf)
180 {
181 	int mirror;
182 	if (!dssdev->driver->get_mirror)
183 		return -ENOENT;
184 	mirror = dssdev->driver->get_mirror(dssdev);
185 	return snprintf(buf, PAGE_SIZE, "%u\n", mirror);
186 }
187 
188 static ssize_t display_mirror_store(struct omap_dss_device *dssdev,
189 	const char *buf, size_t size)
190 {
191 	int r;
192 	bool mirror;
193 
194 	if (!dssdev->driver->set_mirror || !dssdev->driver->get_mirror)
195 		return -ENOENT;
196 
197 	r = strtobool(buf, &mirror);
198 	if (r)
199 		return r;
200 
201 	r = dssdev->driver->set_mirror(dssdev, mirror);
202 	if (r)
203 		return r;
204 
205 	return size;
206 }
207 
208 static ssize_t display_wss_show(struct omap_dss_device *dssdev, char *buf)
209 {
210 	unsigned int wss;
211 
212 	if (!dssdev->driver->get_wss)
213 		return -ENOENT;
214 
215 	wss = dssdev->driver->get_wss(dssdev);
216 
217 	return snprintf(buf, PAGE_SIZE, "0x%05x\n", wss);
218 }
219 
220 static ssize_t display_wss_store(struct omap_dss_device *dssdev,
221 	const char *buf, size_t size)
222 {
223 	u32 wss;
224 	int r;
225 
226 	if (!dssdev->driver->get_wss || !dssdev->driver->set_wss)
227 		return -ENOENT;
228 
229 	r = kstrtou32(buf, 0, &wss);
230 	if (r)
231 		return r;
232 
233 	if (wss > 0xfffff)
234 		return -EINVAL;
235 
236 	r = dssdev->driver->set_wss(dssdev, wss);
237 	if (r)
238 		return r;
239 
240 	return size;
241 }
242 
243 struct display_attribute {
244 	struct attribute attr;
245 	ssize_t (*show)(struct omap_dss_device *, char *);
246 	ssize_t	(*store)(struct omap_dss_device *, const char *, size_t);
247 };
248 
249 #define DISPLAY_ATTR(_name, _mode, _show, _store) \
250 	struct display_attribute display_attr_##_name = \
251 	__ATTR(_name, _mode, _show, _store)
252 
253 static DISPLAY_ATTR(name, S_IRUGO, display_name_show, NULL);
254 static DISPLAY_ATTR(display_name, S_IRUGO, display_name_show, NULL);
255 static DISPLAY_ATTR(enabled, S_IRUGO|S_IWUSR,
256 		display_enabled_show, display_enabled_store);
257 static DISPLAY_ATTR(tear_elim, S_IRUGO|S_IWUSR,
258 		display_tear_show, display_tear_store);
259 static DISPLAY_ATTR(timings, S_IRUGO|S_IWUSR,
260 		display_timings_show, display_timings_store);
261 static DISPLAY_ATTR(rotate, S_IRUGO|S_IWUSR,
262 		display_rotate_show, display_rotate_store);
263 static DISPLAY_ATTR(mirror, S_IRUGO|S_IWUSR,
264 		display_mirror_show, display_mirror_store);
265 static DISPLAY_ATTR(wss, S_IRUGO|S_IWUSR,
266 		display_wss_show, display_wss_store);
267 
268 static struct attribute *display_sysfs_attrs[] = {
269 	&display_attr_name.attr,
270 	&display_attr_display_name.attr,
271 	&display_attr_enabled.attr,
272 	&display_attr_tear_elim.attr,
273 	&display_attr_timings.attr,
274 	&display_attr_rotate.attr,
275 	&display_attr_mirror.attr,
276 	&display_attr_wss.attr,
277 	NULL
278 };
279 
280 static ssize_t display_attr_show(struct kobject *kobj, struct attribute *attr,
281 		char *buf)
282 {
283 	struct omap_dss_device *dssdev;
284 	struct display_attribute *display_attr;
285 
286 	dssdev = container_of(kobj, struct omap_dss_device, kobj);
287 	display_attr = container_of(attr, struct display_attribute, attr);
288 
289 	if (!display_attr->show)
290 		return -ENOENT;
291 
292 	return display_attr->show(dssdev, buf);
293 }
294 
295 static ssize_t display_attr_store(struct kobject *kobj, struct attribute *attr,
296 		const char *buf, size_t size)
297 {
298 	struct omap_dss_device *dssdev;
299 	struct display_attribute *display_attr;
300 
301 	dssdev = container_of(kobj, struct omap_dss_device, kobj);
302 	display_attr = container_of(attr, struct display_attribute, attr);
303 
304 	if (!display_attr->store)
305 		return -ENOENT;
306 
307 	return display_attr->store(dssdev, buf, size);
308 }
309 
310 static const struct sysfs_ops display_sysfs_ops = {
311 	.show = display_attr_show,
312 	.store = display_attr_store,
313 };
314 
315 static struct kobj_type display_ktype = {
316 	.sysfs_ops = &display_sysfs_ops,
317 	.default_attrs = display_sysfs_attrs,
318 };
319 
320 int display_init_sysfs(struct platform_device *pdev)
321 {
322 	struct omap_dss_device *dssdev = NULL;
323 	int r;
324 
325 	for_each_dss_dev(dssdev) {
326 		r = kobject_init_and_add(&dssdev->kobj, &display_ktype,
327 			&pdev->dev.kobj, "%s", dssdev->alias);
328 		if (r) {
329 			DSSERR("failed to create sysfs files\n");
330 			omap_dss_put_device(dssdev);
331 			goto err;
332 		}
333 	}
334 
335 	return 0;
336 
337 err:
338 	display_uninit_sysfs(pdev);
339 
340 	return r;
341 }
342 
343 void display_uninit_sysfs(struct platform_device *pdev)
344 {
345 	struct omap_dss_device *dssdev = NULL;
346 
347 	for_each_dss_dev(dssdev) {
348 		if (kobject_name(&dssdev->kobj) == NULL)
349 			continue;
350 
351 		kobject_del(&dssdev->kobj);
352 		kobject_put(&dssdev->kobj);
353 
354 		memset(&dssdev->kobj, 0, sizeof(dssdev->kobj));
355 	}
356 }
357