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 const char *omapdss_get_default_display_name(void)
58 return core.default_display_name;
60 EXPORT_SYMBOL(omapdss_get_default_display_name);
62 enum omapdss_version omapdss_get_version(void)
64 struct omap_dss_board_info *pdata = core.pdev->dev.platform_data;
65 return pdata->version;
67 EXPORT_SYMBOL(omapdss_get_version);
69 struct platform_device *dss_get_core_pdev(void)
76 struct regulator *dss_get_vdds_dsi(void)
78 struct regulator *reg;
80 if (core.vdds_dsi_reg != NULL)
81 return core.vdds_dsi_reg;
83 reg = regulator_get(&core.pdev->dev, "vdds_dsi");
85 core.vdds_dsi_reg = reg;
90 struct regulator *dss_get_vdds_sdi(void)
92 struct regulator *reg;
94 if (core.vdds_sdi_reg != NULL)
95 return core.vdds_sdi_reg;
97 reg = regulator_get(&core.pdev->dev, "vdds_sdi");
99 core.vdds_sdi_reg = reg;
104 int dss_dsi_enable_pads(int dsi_id, unsigned lane_mask)
106 struct omap_dss_board_info *board_data = core.pdev->dev.platform_data;
108 if (!board_data->dsi_enable_pads)
111 return board_data->dsi_enable_pads(dsi_id, lane_mask);
114 void dss_dsi_disable_pads(int dsi_id, unsigned lane_mask)
116 struct omap_dss_board_info *board_data = core.pdev->dev.platform_data;
118 if (!board_data->dsi_disable_pads)
121 return board_data->dsi_disable_pads(dsi_id, lane_mask);
124 int dss_set_min_bus_tput(struct device *dev, unsigned long tput)
126 struct omap_dss_board_info *pdata = core.pdev->dev.platform_data;
128 if (pdata->set_min_bus_tput)
129 return pdata->set_min_bus_tput(dev, tput);
134 #if defined(CONFIG_OMAP2_DSS_DEBUGFS)
135 static int dss_debug_show(struct seq_file *s, void *unused)
137 void (*func)(struct seq_file *) = s->private;
142 static int dss_debug_open(struct inode *inode, struct file *file)
144 return single_open(file, dss_debug_show, inode->i_private);
147 static const struct file_operations dss_debug_fops = {
148 .open = dss_debug_open,
151 .release = single_release,
154 static struct dentry *dss_debugfs_dir;
156 static int dss_initialize_debugfs(void)
158 dss_debugfs_dir = debugfs_create_dir("omapdss", NULL);
159 if (IS_ERR(dss_debugfs_dir)) {
160 int err = PTR_ERR(dss_debugfs_dir);
161 dss_debugfs_dir = NULL;
165 debugfs_create_file("clk", S_IRUGO, dss_debugfs_dir,
166 &dss_debug_dump_clocks, &dss_debug_fops);
171 static void dss_uninitialize_debugfs(void)
174 debugfs_remove_recursive(dss_debugfs_dir);
177 int dss_debugfs_create_file(const char *name, void (*write)(struct seq_file *))
181 d = debugfs_create_file(name, S_IRUGO, dss_debugfs_dir,
182 write, &dss_debug_fops);
186 #else /* CONFIG_OMAP2_DSS_DEBUGFS */
187 static inline int dss_initialize_debugfs(void)
191 static inline void dss_uninitialize_debugfs(void)
194 int dss_debugfs_create_file(const char *name, void (*write)(struct seq_file *))
198 #endif /* CONFIG_OMAP2_DSS_DEBUGFS */
200 /* PLATFORM DEVICE */
201 static int omap_dss_pm_notif(struct notifier_block *b, unsigned long v, void *d)
203 DSSDBG("pm notif %lu\n", v);
206 case PM_SUSPEND_PREPARE:
207 DSSDBG("suspending displays\n");
208 return dss_suspend_all_devices();
210 case PM_POST_SUSPEND:
211 DSSDBG("resuming displays\n");
212 return dss_resume_all_devices();
219 static struct notifier_block omap_dss_pm_notif_block = {
220 .notifier_call = omap_dss_pm_notif,
223 static int __init omap_dss_probe(struct platform_device *pdev)
225 struct omap_dss_board_info *pdata = pdev->dev.platform_data;
230 dss_features_init(omapdss_get_version());
232 r = dss_initialize_debugfs();
237 core.default_display_name = def_disp_name;
238 else if (pdata->default_device)
239 core.default_display_name = pdata->default_device->name;
241 register_pm_notifier(&omap_dss_pm_notif_block);
250 static int omap_dss_remove(struct platform_device *pdev)
252 unregister_pm_notifier(&omap_dss_pm_notif_block);
254 dss_uninitialize_debugfs();
259 static void omap_dss_shutdown(struct platform_device *pdev)
261 DSSDBG("shutdown\n");
262 dss_disable_all_devices();
265 static struct platform_driver omap_dss_driver = {
266 .remove = omap_dss_remove,
267 .shutdown = omap_dss_shutdown,
270 .owner = THIS_MODULE,
275 static int dss_bus_match(struct device *dev, struct device_driver *driver)
277 struct omap_dss_device *dssdev = to_dss_device(dev);
279 DSSDBG("bus_match. dev %s/%s, drv %s\n",
280 dev_name(dev), dssdev->driver_name, driver->name);
282 return strcmp(dssdev->driver_name, driver->name) == 0;
285 static ssize_t device_name_show(struct device *dev,
286 struct device_attribute *attr, char *buf)
288 struct omap_dss_device *dssdev = to_dss_device(dev);
289 return snprintf(buf, PAGE_SIZE, "%s\n",
294 static struct device_attribute default_dev_attrs[] = {
295 __ATTR(name, S_IRUGO, device_name_show, NULL),
299 static ssize_t driver_name_show(struct device_driver *drv, char *buf)
301 struct omap_dss_driver *dssdrv = to_dss_driver(drv);
302 return snprintf(buf, PAGE_SIZE, "%s\n",
303 dssdrv->driver.name ?
304 dssdrv->driver.name : "");
306 static struct driver_attribute default_drv_attrs[] = {
307 __ATTR(name, S_IRUGO, driver_name_show, NULL),
311 static struct bus_type dss_bus_type = {
313 .match = dss_bus_match,
314 .dev_attrs = default_dev_attrs,
315 .drv_attrs = default_drv_attrs,
318 static void dss_bus_release(struct device *dev)
320 DSSDBG("bus_release\n");
323 static struct device dss_bus = {
324 .release = dss_bus_release,
327 struct bus_type *dss_get_bus(void)
329 return &dss_bus_type;
333 static int dss_driver_probe(struct device *dev)
336 struct omap_dss_driver *dssdrv = to_dss_driver(dev->driver);
337 struct omap_dss_device *dssdev = to_dss_device(dev);
339 DSSDBG("driver_probe: dev %s/%s, drv %s\n",
340 dev_name(dev), dssdev->driver_name,
341 dssdrv->driver.name);
343 r = dssdrv->probe(dssdev);
346 DSSERR("driver probe failed: %d\n", r);
350 DSSDBG("probe done for device %s\n", dev_name(dev));
352 dssdev->driver = dssdrv;
357 static int dss_driver_remove(struct device *dev)
359 struct omap_dss_driver *dssdrv = to_dss_driver(dev->driver);
360 struct omap_dss_device *dssdev = to_dss_device(dev);
362 DSSDBG("driver_remove: dev %s/%s\n", dev_name(dev),
363 dssdev->driver_name);
365 dssdrv->remove(dssdev);
367 dssdev->driver = NULL;
372 int omap_dss_register_driver(struct omap_dss_driver *dssdriver)
374 dssdriver->driver.bus = &dss_bus_type;
375 dssdriver->driver.probe = dss_driver_probe;
376 dssdriver->driver.remove = dss_driver_remove;
378 if (dssdriver->get_resolution == NULL)
379 dssdriver->get_resolution = omapdss_default_get_resolution;
380 if (dssdriver->get_recommended_bpp == NULL)
381 dssdriver->get_recommended_bpp =
382 omapdss_default_get_recommended_bpp;
383 if (dssdriver->get_timings == NULL)
384 dssdriver->get_timings = omapdss_default_get_timings;
386 return driver_register(&dssdriver->driver);
388 EXPORT_SYMBOL(omap_dss_register_driver);
390 void omap_dss_unregister_driver(struct omap_dss_driver *dssdriver)
392 driver_unregister(&dssdriver->driver);
394 EXPORT_SYMBOL(omap_dss_unregister_driver);
398 static void omap_dss_dev_release(struct device *dev)
400 struct omap_dss_device *dssdev = to_dss_device(dev);
404 static int disp_num_counter;
406 struct omap_dss_device *dss_alloc_and_init_device(struct device *parent)
408 struct omap_dss_device *dssdev;
410 dssdev = kzalloc(sizeof(*dssdev), GFP_KERNEL);
414 dssdev->dev.bus = &dss_bus_type;
415 dssdev->dev.parent = parent;
416 dssdev->dev.release = omap_dss_dev_release;
417 dev_set_name(&dssdev->dev, "display%d", disp_num_counter++);
419 device_initialize(&dssdev->dev);
424 int dss_add_device(struct omap_dss_device *dssdev)
426 return device_add(&dssdev->dev);
429 void dss_put_device(struct omap_dss_device *dssdev)
431 put_device(&dssdev->dev);
434 void dss_unregister_device(struct omap_dss_device *dssdev)
436 device_unregister(&dssdev->dev);
439 static int dss_unregister_dss_dev(struct device *dev, void *data)
441 struct omap_dss_device *dssdev = to_dss_device(dev);
442 dss_unregister_device(dssdev);
446 void dss_unregister_child_devices(struct device *parent)
448 device_for_each_child(parent, NULL, dss_unregister_dss_dev);
451 void dss_copy_device_pdata(struct omap_dss_device *dst,
452 const struct omap_dss_device *src)
456 size_t dsize = sizeof(struct device);
458 memcpy(d + dsize, s + dsize, sizeof(struct omap_dss_device) - dsize);
462 static int __init omap_dss_bus_register(void)
466 r = bus_register(&dss_bus_type);
468 DSSERR("bus register failed\n");
472 dev_set_name(&dss_bus, "omapdss");
473 r = device_register(&dss_bus);
475 DSSERR("bus driver register failed\n");
476 bus_unregister(&dss_bus_type);
484 static int (*dss_output_drv_reg_funcs[])(void) __initdata = {
485 #ifdef CONFIG_OMAP2_DSS_DSI
486 dsi_init_platform_driver,
488 #ifdef CONFIG_OMAP2_DSS_DPI
489 dpi_init_platform_driver,
491 #ifdef CONFIG_OMAP2_DSS_SDI
492 sdi_init_platform_driver,
494 #ifdef CONFIG_OMAP2_DSS_RFBI
495 rfbi_init_platform_driver,
497 #ifdef CONFIG_OMAP2_DSS_VENC
498 venc_init_platform_driver,
500 #ifdef CONFIG_OMAP4_DSS_HDMI
501 hdmi_init_platform_driver,
505 static void (*dss_output_drv_unreg_funcs[])(void) __exitdata = {
506 #ifdef CONFIG_OMAP2_DSS_DSI
507 dsi_uninit_platform_driver,
509 #ifdef CONFIG_OMAP2_DSS_DPI
510 dpi_uninit_platform_driver,
512 #ifdef CONFIG_OMAP2_DSS_SDI
513 sdi_uninit_platform_driver,
515 #ifdef CONFIG_OMAP2_DSS_RFBI
516 rfbi_uninit_platform_driver,
518 #ifdef CONFIG_OMAP2_DSS_VENC
519 venc_uninit_platform_driver,
521 #ifdef CONFIG_OMAP4_DSS_HDMI
522 hdmi_uninit_platform_driver,
526 static bool dss_output_drv_loaded[ARRAY_SIZE(dss_output_drv_reg_funcs)];
528 static int __init omap_dss_register_drivers(void)
533 r = platform_driver_probe(&omap_dss_driver, omap_dss_probe);
537 r = dss_init_platform_driver();
539 DSSERR("Failed to initialize DSS platform driver\n");
543 r = dispc_init_platform_driver();
545 DSSERR("Failed to initialize dispc platform driver\n");
550 * It's ok if the output-driver register fails. It happens, for example,
551 * when there is no output-device (e.g. SDI for OMAP4).
553 for (i = 0; i < ARRAY_SIZE(dss_output_drv_reg_funcs); ++i) {
554 r = dss_output_drv_reg_funcs[i]();
556 dss_output_drv_loaded[i] = true;
562 dss_uninit_platform_driver();
564 platform_driver_unregister(&omap_dss_driver);
569 static void __exit omap_dss_unregister_drivers(void)
573 for (i = 0; i < ARRAY_SIZE(dss_output_drv_unreg_funcs); ++i) {
574 if (dss_output_drv_loaded[i])
575 dss_output_drv_unreg_funcs[i]();
578 dispc_uninit_platform_driver();
579 dss_uninit_platform_driver();
581 platform_driver_unregister(&omap_dss_driver);
584 #ifdef CONFIG_OMAP2_DSS_MODULE
585 static void omap_dss_bus_unregister(void)
587 device_unregister(&dss_bus);
589 bus_unregister(&dss_bus_type);
592 static int __init omap_dss_init(void)
596 r = omap_dss_bus_register();
600 r = omap_dss_register_drivers();
602 omap_dss_bus_unregister();
609 static void __exit omap_dss_exit(void)
611 if (core.vdds_dsi_reg != NULL) {
612 regulator_put(core.vdds_dsi_reg);
613 core.vdds_dsi_reg = NULL;
616 if (core.vdds_sdi_reg != NULL) {
617 regulator_put(core.vdds_sdi_reg);
618 core.vdds_sdi_reg = NULL;
621 omap_dss_unregister_drivers();
623 omap_dss_bus_unregister();
626 module_init(omap_dss_init);
627 module_exit(omap_dss_exit);
629 static int __init omap_dss_init(void)
631 return omap_dss_bus_register();
634 static int __init omap_dss_init2(void)
636 return omap_dss_register_drivers();
639 core_initcall(omap_dss_init);
640 device_initcall(omap_dss_init2);
643 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@nokia.com>");
644 MODULE_DESCRIPTION("OMAP2/3 Display Subsystem");
645 MODULE_LICENSE("GPL v2");