2 * linux/drivers/video/omap2/dss/core.c
4 * Copyright (C) 2009 Nokia Corporation
5 * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
7 * Some code and ideas taken from drivers/video/omap/ driver
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.
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
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/>.
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>
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>
41 #include "dss_features.h"
44 struct platform_device *pdev;
46 struct regulator *vdds_dsi_reg;
47 struct regulator *vdds_sdi_reg;
49 const char *default_display_name;
52 static char *def_disp_name;
53 module_param_named(def_disp, def_disp_name, charp, 0);
54 MODULE_PARM_DESC(def_disp, "default display name");
56 static bool dss_initialized;
58 const char *omapdss_get_default_display_name(void)
60 return core.default_display_name;
62 EXPORT_SYMBOL(omapdss_get_default_display_name);
64 enum omapdss_version omapdss_get_version(void)
66 struct omap_dss_board_info *pdata = core.pdev->dev.platform_data;
67 return pdata->version;
69 EXPORT_SYMBOL(omapdss_get_version);
71 bool omapdss_is_initialized(void)
73 return dss_initialized;
75 EXPORT_SYMBOL(omapdss_is_initialized);
77 struct platform_device *dss_get_core_pdev(void)
84 struct regulator *dss_get_vdds_dsi(void)
86 struct regulator *reg;
88 if (core.vdds_dsi_reg != NULL)
89 return core.vdds_dsi_reg;
91 reg = regulator_get(&core.pdev->dev, "vdds_dsi");
93 core.vdds_dsi_reg = reg;
98 struct regulator *dss_get_vdds_sdi(void)
100 struct regulator *reg;
102 if (core.vdds_sdi_reg != NULL)
103 return core.vdds_sdi_reg;
105 reg = regulator_get(&core.pdev->dev, "vdds_sdi");
107 core.vdds_sdi_reg = reg;
112 int dss_dsi_enable_pads(int dsi_id, unsigned lane_mask)
114 struct omap_dss_board_info *board_data = core.pdev->dev.platform_data;
116 if (!board_data->dsi_enable_pads)
119 return board_data->dsi_enable_pads(dsi_id, lane_mask);
122 void dss_dsi_disable_pads(int dsi_id, unsigned lane_mask)
124 struct omap_dss_board_info *board_data = core.pdev->dev.platform_data;
126 if (!board_data->dsi_disable_pads)
129 return board_data->dsi_disable_pads(dsi_id, lane_mask);
132 int dss_set_min_bus_tput(struct device *dev, unsigned long tput)
134 struct omap_dss_board_info *pdata = core.pdev->dev.platform_data;
136 if (pdata->set_min_bus_tput)
137 return pdata->set_min_bus_tput(dev, tput);
142 #if defined(CONFIG_OMAP2_DSS_DEBUGFS)
143 static int dss_debug_show(struct seq_file *s, void *unused)
145 void (*func)(struct seq_file *) = s->private;
150 static int dss_debug_open(struct inode *inode, struct file *file)
152 return single_open(file, dss_debug_show, inode->i_private);
155 static const struct file_operations dss_debug_fops = {
156 .open = dss_debug_open,
159 .release = single_release,
162 static struct dentry *dss_debugfs_dir;
164 static int dss_initialize_debugfs(void)
166 dss_debugfs_dir = debugfs_create_dir("omapdss", NULL);
167 if (IS_ERR(dss_debugfs_dir)) {
168 int err = PTR_ERR(dss_debugfs_dir);
169 dss_debugfs_dir = NULL;
173 debugfs_create_file("clk", S_IRUGO, dss_debugfs_dir,
174 &dss_debug_dump_clocks, &dss_debug_fops);
179 static void dss_uninitialize_debugfs(void)
182 debugfs_remove_recursive(dss_debugfs_dir);
185 int dss_debugfs_create_file(const char *name, void (*write)(struct seq_file *))
189 d = debugfs_create_file(name, S_IRUGO, dss_debugfs_dir,
190 write, &dss_debug_fops);
194 #else /* CONFIG_OMAP2_DSS_DEBUGFS */
195 static inline int dss_initialize_debugfs(void)
199 static inline void dss_uninitialize_debugfs(void)
202 int dss_debugfs_create_file(const char *name, void (*write)(struct seq_file *))
206 #endif /* CONFIG_OMAP2_DSS_DEBUGFS */
208 /* PLATFORM DEVICE */
209 static int omap_dss_pm_notif(struct notifier_block *b, unsigned long v, void *d)
211 DSSDBG("pm notif %lu\n", v);
214 case PM_SUSPEND_PREPARE:
215 DSSDBG("suspending displays\n");
216 return dss_suspend_all_devices();
218 case PM_POST_SUSPEND:
219 DSSDBG("resuming displays\n");
220 return dss_resume_all_devices();
227 static struct notifier_block omap_dss_pm_notif_block = {
228 .notifier_call = omap_dss_pm_notif,
231 static int __init omap_dss_probe(struct platform_device *pdev)
233 struct omap_dss_board_info *pdata = pdev->dev.platform_data;
238 dss_features_init(omapdss_get_version());
240 r = dss_initialize_debugfs();
245 core.default_display_name = def_disp_name;
246 else if (pdata->default_device)
247 core.default_display_name = pdata->default_device->name;
249 register_pm_notifier(&omap_dss_pm_notif_block);
258 static int omap_dss_remove(struct platform_device *pdev)
260 unregister_pm_notifier(&omap_dss_pm_notif_block);
262 dss_uninitialize_debugfs();
267 static void omap_dss_shutdown(struct platform_device *pdev)
269 DSSDBG("shutdown\n");
270 dss_disable_all_devices();
273 static struct platform_driver omap_dss_driver = {
274 .remove = omap_dss_remove,
275 .shutdown = omap_dss_shutdown,
278 .owner = THIS_MODULE,
283 static int dss_bus_match(struct device *dev, struct device_driver *driver)
285 struct omap_dss_device *dssdev = to_dss_device(dev);
287 DSSDBG("bus_match. dev %s/%s, drv %s\n",
288 dev_name(dev), dssdev->driver_name, driver->name);
290 return strcmp(dssdev->driver_name, driver->name) == 0;
293 static ssize_t device_name_show(struct device *dev,
294 struct device_attribute *attr, char *buf)
296 struct omap_dss_device *dssdev = to_dss_device(dev);
297 return snprintf(buf, PAGE_SIZE, "%s\n",
302 static struct device_attribute default_dev_attrs[] = {
303 __ATTR(name, S_IRUGO, device_name_show, NULL),
307 static ssize_t driver_name_show(struct device_driver *drv, char *buf)
309 struct omap_dss_driver *dssdrv = to_dss_driver(drv);
310 return snprintf(buf, PAGE_SIZE, "%s\n",
311 dssdrv->driver.name ?
312 dssdrv->driver.name : "");
314 static struct driver_attribute default_drv_attrs[] = {
315 __ATTR(name, S_IRUGO, driver_name_show, NULL),
319 static struct bus_type dss_bus_type = {
321 .match = dss_bus_match,
322 .dev_attrs = default_dev_attrs,
323 .drv_attrs = default_drv_attrs,
326 static void dss_bus_release(struct device *dev)
328 DSSDBG("bus_release\n");
331 static struct device dss_bus = {
332 .release = dss_bus_release,
335 struct bus_type *dss_get_bus(void)
337 return &dss_bus_type;
341 static int dss_driver_probe(struct device *dev)
344 struct omap_dss_driver *dssdrv = to_dss_driver(dev->driver);
345 struct omap_dss_device *dssdev = to_dss_device(dev);
347 DSSDBG("driver_probe: dev %s/%s, drv %s\n",
348 dev_name(dev), dssdev->driver_name,
349 dssdrv->driver.name);
351 r = dssdrv->probe(dssdev);
354 DSSERR("driver probe failed: %d\n", r);
358 DSSDBG("probe done for device %s\n", dev_name(dev));
360 dssdev->driver = dssdrv;
365 static int dss_driver_remove(struct device *dev)
367 struct omap_dss_driver *dssdrv = to_dss_driver(dev->driver);
368 struct omap_dss_device *dssdev = to_dss_device(dev);
370 DSSDBG("driver_remove: dev %s/%s\n", dev_name(dev),
371 dssdev->driver_name);
373 dssdrv->remove(dssdev);
375 dssdev->driver = NULL;
380 int omap_dss_register_driver(struct omap_dss_driver *dssdriver)
382 dssdriver->driver.bus = &dss_bus_type;
383 dssdriver->driver.probe = dss_driver_probe;
384 dssdriver->driver.remove = dss_driver_remove;
386 if (dssdriver->get_resolution == NULL)
387 dssdriver->get_resolution = omapdss_default_get_resolution;
388 if (dssdriver->get_recommended_bpp == NULL)
389 dssdriver->get_recommended_bpp =
390 omapdss_default_get_recommended_bpp;
391 if (dssdriver->get_timings == NULL)
392 dssdriver->get_timings = omapdss_default_get_timings;
394 return driver_register(&dssdriver->driver);
396 EXPORT_SYMBOL(omap_dss_register_driver);
398 void omap_dss_unregister_driver(struct omap_dss_driver *dssdriver)
400 driver_unregister(&dssdriver->driver);
402 EXPORT_SYMBOL(omap_dss_unregister_driver);
406 static void omap_dss_dev_release(struct device *dev)
408 struct omap_dss_device *dssdev = to_dss_device(dev);
412 static int disp_num_counter;
414 struct omap_dss_device *dss_alloc_and_init_device(struct device *parent)
416 struct omap_dss_device *dssdev;
418 dssdev = kzalloc(sizeof(*dssdev), GFP_KERNEL);
422 dssdev->dev.bus = &dss_bus_type;
423 dssdev->dev.parent = parent;
424 dssdev->dev.release = omap_dss_dev_release;
425 dev_set_name(&dssdev->dev, "display%d", disp_num_counter++);
427 device_initialize(&dssdev->dev);
432 int dss_add_device(struct omap_dss_device *dssdev)
434 return device_add(&dssdev->dev);
437 void dss_put_device(struct omap_dss_device *dssdev)
439 put_device(&dssdev->dev);
442 void dss_unregister_device(struct omap_dss_device *dssdev)
444 device_unregister(&dssdev->dev);
447 static int dss_unregister_dss_dev(struct device *dev, void *data)
449 struct omap_dss_device *dssdev = to_dss_device(dev);
450 dss_unregister_device(dssdev);
454 void dss_unregister_child_devices(struct device *parent)
456 device_for_each_child(parent, NULL, dss_unregister_dss_dev);
459 void dss_copy_device_pdata(struct omap_dss_device *dst,
460 const struct omap_dss_device *src)
464 size_t dsize = sizeof(struct device);
466 memcpy(d + dsize, s + dsize, sizeof(struct omap_dss_device) - dsize);
470 static int __init omap_dss_bus_register(void)
474 r = bus_register(&dss_bus_type);
476 DSSERR("bus register failed\n");
480 dev_set_name(&dss_bus, "omapdss");
481 r = device_register(&dss_bus);
483 DSSERR("bus driver register failed\n");
484 bus_unregister(&dss_bus_type);
492 static int (*dss_output_drv_reg_funcs[])(void) __initdata = {
493 #ifdef CONFIG_OMAP2_DSS_DSI
494 dsi_init_platform_driver,
496 #ifdef CONFIG_OMAP2_DSS_DPI
497 dpi_init_platform_driver,
499 #ifdef CONFIG_OMAP2_DSS_SDI
500 sdi_init_platform_driver,
502 #ifdef CONFIG_OMAP2_DSS_RFBI
503 rfbi_init_platform_driver,
505 #ifdef CONFIG_OMAP2_DSS_VENC
506 venc_init_platform_driver,
508 #ifdef CONFIG_OMAP4_DSS_HDMI
509 hdmi_init_platform_driver,
513 static void (*dss_output_drv_unreg_funcs[])(void) __exitdata = {
514 #ifdef CONFIG_OMAP2_DSS_DSI
515 dsi_uninit_platform_driver,
517 #ifdef CONFIG_OMAP2_DSS_DPI
518 dpi_uninit_platform_driver,
520 #ifdef CONFIG_OMAP2_DSS_SDI
521 sdi_uninit_platform_driver,
523 #ifdef CONFIG_OMAP2_DSS_RFBI
524 rfbi_uninit_platform_driver,
526 #ifdef CONFIG_OMAP2_DSS_VENC
527 venc_uninit_platform_driver,
529 #ifdef CONFIG_OMAP4_DSS_HDMI
530 hdmi_uninit_platform_driver,
534 static bool dss_output_drv_loaded[ARRAY_SIZE(dss_output_drv_reg_funcs)];
536 static int __init omap_dss_register_drivers(void)
541 r = platform_driver_probe(&omap_dss_driver, omap_dss_probe);
545 r = dss_init_platform_driver();
547 DSSERR("Failed to initialize DSS platform driver\n");
551 r = dispc_init_platform_driver();
553 DSSERR("Failed to initialize dispc platform driver\n");
558 * It's ok if the output-driver register fails. It happens, for example,
559 * when there is no output-device (e.g. SDI for OMAP4).
561 for (i = 0; i < ARRAY_SIZE(dss_output_drv_reg_funcs); ++i) {
562 r = dss_output_drv_reg_funcs[i]();
564 dss_output_drv_loaded[i] = true;
570 dss_uninit_platform_driver();
572 platform_driver_unregister(&omap_dss_driver);
577 static void __exit omap_dss_unregister_drivers(void)
581 for (i = 0; i < ARRAY_SIZE(dss_output_drv_unreg_funcs); ++i) {
582 if (dss_output_drv_loaded[i])
583 dss_output_drv_unreg_funcs[i]();
586 dispc_uninit_platform_driver();
587 dss_uninit_platform_driver();
589 platform_driver_unregister(&omap_dss_driver);
592 #ifdef CONFIG_OMAP2_DSS_MODULE
593 static void omap_dss_bus_unregister(void)
595 device_unregister(&dss_bus);
597 bus_unregister(&dss_bus_type);
600 static int __init omap_dss_init(void)
604 r = omap_dss_bus_register();
608 r = omap_dss_register_drivers();
610 omap_dss_bus_unregister();
614 dss_initialized = true;
619 static void __exit omap_dss_exit(void)
621 if (core.vdds_dsi_reg != NULL) {
622 regulator_put(core.vdds_dsi_reg);
623 core.vdds_dsi_reg = NULL;
626 if (core.vdds_sdi_reg != NULL) {
627 regulator_put(core.vdds_sdi_reg);
628 core.vdds_sdi_reg = NULL;
631 omap_dss_unregister_drivers();
633 omap_dss_bus_unregister();
636 module_init(omap_dss_init);
637 module_exit(omap_dss_exit);
639 static int __init omap_dss_init(void)
641 return omap_dss_bus_register();
644 static int __init omap_dss_init2(void)
648 r = omap_dss_register_drivers();
652 dss_initialized = true;
657 core_initcall(omap_dss_init);
658 device_initcall(omap_dss_init2);
661 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@nokia.com>");
662 MODULE_DESCRIPTION("OMAP2/3 Display Subsystem");
663 MODULE_LICENSE("GPL v2");