6b74f73fb5245bef81031ae40d810bd2a6fa8d2d
[android-sdk/kernel-video.git] / drivers / video / fbdev / omap2 / dss / core.c
1 /*
2  * linux/drivers/video/omap2/dss/core.c
3  *
4  * Copyright (C) 2009 Nokia Corporation
5  * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
6  *
7  * Some code and ideas taken from drivers/video/omap/ driver
8  * by Imre Deak.
9  *
10  * This program is free software; you can redistribute it and/or modify it
11  * under the terms of the GNU General Public License version 2 as published by
12  * the Free Software Foundation.
13  *
14  * This program is distributed in the hope that it will be useful, but WITHOUT
15  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
16  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
17  * more details.
18  *
19  * You should have received a copy of the GNU General Public License along with
20  * this program.  If not, see <http://www.gnu.org/licenses/>.
21  */
23 #define DSS_SUBSYS_NAME "CORE"
25 #include <linux/kernel.h>
26 #include <linux/module.h>
27 #include <linux/clk.h>
28 #include <linux/err.h>
29 #include <linux/platform_device.h>
30 #include <linux/seq_file.h>
31 #include <linux/debugfs.h>
32 #include <linux/io.h>
33 #include <linux/device.h>
34 #include <linux/regulator/consumer.h>
35 #include <linux/suspend.h>
36 #include <linux/slab.h>
38 #include <video/omapdss.h>
40 #include "dss.h"
41 #include "dss_features.h"
43 static struct {
44         struct platform_device *pdev;
46         const char *default_display_name;
47 } core;
49 static char *def_disp_name;
50 module_param_named(def_disp, def_disp_name, charp, 0);
51 MODULE_PARM_DESC(def_disp, "default display name");
53 static bool dss_initialized;
55 const char *omapdss_get_default_display_name(void)
56 {
57         return core.default_display_name;
58 }
59 EXPORT_SYMBOL(omapdss_get_default_display_name);
61 enum omapdss_version omapdss_get_version(void)
62 {
63         struct omap_dss_board_info *pdata = core.pdev->dev.platform_data;
64         return pdata->version;
65 }
66 EXPORT_SYMBOL(omapdss_get_version);
68 bool omapdss_is_initialized(void)
69 {
70         return dss_initialized;
71 }
72 EXPORT_SYMBOL(omapdss_is_initialized);
74 struct platform_device *dss_get_core_pdev(void)
75 {
76         return core.pdev;
77 }
79 int dss_dsi_enable_pads(int dsi_id, unsigned lane_mask)
80 {
81         struct omap_dss_board_info *board_data = core.pdev->dev.platform_data;
83         if (!board_data->dsi_enable_pads)
84                 return -ENOENT;
86         return board_data->dsi_enable_pads(dsi_id, lane_mask);
87 }
89 void dss_dsi_disable_pads(int dsi_id, unsigned lane_mask)
90 {
91         struct omap_dss_board_info *board_data = core.pdev->dev.platform_data;
93         if (!board_data->dsi_disable_pads)
94                 return;
96         return board_data->dsi_disable_pads(dsi_id, lane_mask);
97 }
99 int dss_set_min_bus_tput(struct device *dev, unsigned long tput)
101         struct omap_dss_board_info *pdata = core.pdev->dev.platform_data;
103         if (pdata->set_min_bus_tput)
104                 return pdata->set_min_bus_tput(dev, tput);
105         else
106                 return 0;
109 #if defined(CONFIG_OMAP2_DSS_DEBUGFS)
110 static int dss_debug_show(struct seq_file *s, void *unused)
112         void (*func)(struct seq_file *) = s->private;
113         func(s);
114         return 0;
117 static int dss_debug_open(struct inode *inode, struct file *file)
119         return single_open(file, dss_debug_show, inode->i_private);
122 static const struct file_operations dss_debug_fops = {
123         .open           = dss_debug_open,
124         .read           = seq_read,
125         .llseek         = seq_lseek,
126         .release        = single_release,
127 };
129 static struct dentry *dss_debugfs_dir;
131 static int dss_initialize_debugfs(void)
133         dss_debugfs_dir = debugfs_create_dir("omapdss", NULL);
134         if (IS_ERR(dss_debugfs_dir)) {
135                 int err = PTR_ERR(dss_debugfs_dir);
136                 dss_debugfs_dir = NULL;
137                 return err;
138         }
140         debugfs_create_file("clk", S_IRUGO, dss_debugfs_dir,
141                         &dss_debug_dump_clocks, &dss_debug_fops);
143         return 0;
146 static void dss_uninitialize_debugfs(void)
148         if (dss_debugfs_dir)
149                 debugfs_remove_recursive(dss_debugfs_dir);
152 int dss_debugfs_create_file(const char *name, void (*write)(struct seq_file *))
154         struct dentry *d;
156         d = debugfs_create_file(name, S_IRUGO, dss_debugfs_dir,
157                         write, &dss_debug_fops);
159         return PTR_ERR_OR_ZERO(d);
161 #else /* CONFIG_OMAP2_DSS_DEBUGFS */
162 static inline int dss_initialize_debugfs(void)
164         return 0;
166 static inline void dss_uninitialize_debugfs(void)
169 int dss_debugfs_create_file(const char *name, void (*write)(struct seq_file *))
171         return 0;
173 #endif /* CONFIG_OMAP2_DSS_DEBUGFS */
175 /* PLATFORM DEVICE */
176 static int omap_dss_pm_notif(struct notifier_block *b, unsigned long v, void *d)
178         DSSDBG("pm notif %lu\n", v);
180         switch (v) {
181         case PM_SUSPEND_PREPARE:
182                 DSSDBG("suspending displays\n");
183                 return dss_suspend_all_devices();
185         case PM_POST_SUSPEND:
186                 DSSDBG("resuming displays\n");
187                 return dss_resume_all_devices();
189         default:
190                 return 0;
191         }
194 static struct notifier_block omap_dss_pm_notif_block = {
195         .notifier_call = omap_dss_pm_notif,
196 };
198 static int __init omap_dss_probe(struct platform_device *pdev)
200         struct omap_dss_board_info *pdata = pdev->dev.platform_data;
201         int r;
203         core.pdev = pdev;
205         dss_features_init(omapdss_get_version());
207         r = dss_initialize_debugfs();
208         if (r)
209                 goto err_debugfs;
211         if (def_disp_name)
212                 core.default_display_name = def_disp_name;
213         else if (pdata->default_display_name)
214                 core.default_display_name = pdata->default_display_name;
215         else if (pdata->default_device)
216                 core.default_display_name = pdata->default_device->name;
218         register_pm_notifier(&omap_dss_pm_notif_block);
220         return 0;
222 err_debugfs:
224         return r;
227 static int omap_dss_remove(struct platform_device *pdev)
229         unregister_pm_notifier(&omap_dss_pm_notif_block);
231         dss_uninitialize_debugfs();
233         return 0;
236 static void omap_dss_shutdown(struct platform_device *pdev)
238         DSSDBG("shutdown\n");
239         dss_disable_all_devices();
242 static struct platform_driver omap_dss_driver = {
243         .remove         = omap_dss_remove,
244         .shutdown       = omap_dss_shutdown,
245         .driver         = {
246                 .name   = "omapdss",
247                 .owner  = THIS_MODULE,
248         },
249 };
251 /* INIT */
252 static int (*dss_output_drv_reg_funcs[])(void) __initdata = {
253 #ifdef CONFIG_OMAP2_DSS_DSI
254         dsi_init_platform_driver,
255 #endif
256 #ifdef CONFIG_OMAP2_DSS_DPI
257         dpi_init_platform_driver,
258 #endif
259 #ifdef CONFIG_OMAP2_DSS_SDI
260         sdi_init_platform_driver,
261 #endif
262 #ifdef CONFIG_OMAP2_DSS_RFBI
263         rfbi_init_platform_driver,
264 #endif
265 #ifdef CONFIG_OMAP2_DSS_VENC
266         venc_init_platform_driver,
267 #endif
268 #ifdef CONFIG_OMAP4_DSS_HDMI
269         hdmi4_init_platform_driver,
270 #endif
271 #ifdef CONFIG_OMAP5_DSS_HDMI
272         hdmi5_init_platform_driver,
273 #endif
274 };
276 static void (*dss_output_drv_unreg_funcs[])(void) __exitdata = {
277 #ifdef CONFIG_OMAP2_DSS_DSI
278         dsi_uninit_platform_driver,
279 #endif
280 #ifdef CONFIG_OMAP2_DSS_DPI
281         dpi_uninit_platform_driver,
282 #endif
283 #ifdef CONFIG_OMAP2_DSS_SDI
284         sdi_uninit_platform_driver,
285 #endif
286 #ifdef CONFIG_OMAP2_DSS_RFBI
287         rfbi_uninit_platform_driver,
288 #endif
289 #ifdef CONFIG_OMAP2_DSS_VENC
290         venc_uninit_platform_driver,
291 #endif
292 #ifdef CONFIG_OMAP4_DSS_HDMI
293         hdmi4_uninit_platform_driver,
294 #endif
295 #ifdef CONFIG_OMAP5_DSS_HDMI
296         hdmi5_uninit_platform_driver,
297 #endif
298 };
300 static bool dss_output_drv_loaded[ARRAY_SIZE(dss_output_drv_reg_funcs)];
302 static int __init omap_dss_init(void)
304         int r;
305         int i;
307         r = platform_driver_probe(&omap_dss_driver, omap_dss_probe);
308         if (r)
309                 return r;
311         r = dss_init_platform_driver();
312         if (r) {
313                 DSSERR("Failed to initialize DSS platform driver\n");
314                 goto err_dss;
315         }
317         r = dispc_init_platform_driver();
318         if (r) {
319                 DSSERR("Failed to initialize dispc platform driver\n");
320                 goto err_dispc;
321         }
323         /*
324          * It's ok if the output-driver register fails. It happens, for example,
325          * when there is no output-device (e.g. SDI for OMAP4).
326          */
327         for (i = 0; i < ARRAY_SIZE(dss_output_drv_reg_funcs); ++i) {
328                 r = dss_output_drv_reg_funcs[i]();
329                 if (r == 0)
330                         dss_output_drv_loaded[i] = true;
331         }
333         dss_initialized = true;
335         return 0;
337 err_dispc:
338         dss_uninit_platform_driver();
339 err_dss:
340         platform_driver_unregister(&omap_dss_driver);
342         return r;
345 static void __exit omap_dss_exit(void)
347         int i;
349         for (i = 0; i < ARRAY_SIZE(dss_output_drv_unreg_funcs); ++i) {
350                 if (dss_output_drv_loaded[i])
351                         dss_output_drv_unreg_funcs[i]();
352         }
354         dispc_uninit_platform_driver();
355         dss_uninit_platform_driver();
357         platform_driver_unregister(&omap_dss_driver);
360 module_init(omap_dss_init);
361 module_exit(omap_dss_exit);
363 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@nokia.com>");
364 MODULE_DESCRIPTION("OMAP2/3 Display Subsystem");
365 MODULE_LICENSE("GPL v2");