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/*
* Copyright (C) ST-Ericsson AB 2010
*
* ST-Ericsson MCDE display bus driver
*
* Author: Marcus Lorentzon <marcus.xm.lorentzon@stericsson.com>
* for ST-Ericsson.
*
* License terms: GNU General Public License (GPL), version 2.
*/
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/notifier.h>
#include <video/mcde_display.h>
#include <video/mcde_dss.h>
#define to_mcde_display_driver(__drv) \
container_of((__drv), struct mcde_display_driver, driver)
static BLOCKING_NOTIFIER_HEAD(bus_notifier_list);
static int mcde_drv_suspend(struct device *_dev, pm_message_t state);
static int mcde_drv_resume(struct device *_dev);
struct bus_type mcde_bus_type;
static int mcde_suspend_device(struct device *dev, void *data)
{
pm_message_t* state = (pm_message_t *) data;
if (dev->driver && dev->driver->suspend)
return dev->driver->suspend(dev, *state);
return 0;
}
static int mcde_resume_device(struct device *dev, void *data)
{
if (dev->driver && dev->driver->resume)
return dev->driver->resume(dev);
return 0;
}
/* Bus driver */
static int mcde_bus_match(struct device *_dev, struct device_driver *driver)
{
pr_debug("Matching device %s with driver %s\n",
dev_name(_dev), driver->name);
return strncmp(dev_name(_dev), driver->name, strlen(driver->name)) == 0;
}
static int mcde_bus_suspend(struct device *_dev, pm_message_t state)
{
int ret;
ret = bus_for_each_dev(&mcde_bus_type, NULL, &state,
mcde_suspend_device);
if (ret) {
/* TODO Resume all suspended devices */
/* mcde_bus_resume(dev); */
return ret;
}
return 0;
}
static int mcde_bus_resume(struct device *_dev)
{
return bus_for_each_dev(&mcde_bus_type, NULL, NULL, mcde_resume_device);
}
struct bus_type mcde_bus_type = {
.name = "mcde_bus",
.match = mcde_bus_match,
.suspend = mcde_bus_suspend,
.resume = mcde_bus_resume,
};
static int mcde_drv_probe(struct device *_dev)
{
struct mcde_display_driver *drv = to_mcde_display_driver(_dev->driver);
struct mcde_display_device *dev = to_mcde_display_device(_dev);
return drv->probe(dev);
}
static int mcde_drv_remove(struct device *_dev)
{
struct mcde_display_driver *drv = to_mcde_display_driver(_dev->driver);
struct mcde_display_device *dev = to_mcde_display_device(_dev);
return drv->remove(dev);
}
static void mcde_drv_shutdown(struct device *_dev)
{
struct mcde_display_driver *drv = to_mcde_display_driver(_dev->driver);
struct mcde_display_device *dev = to_mcde_display_device(_dev);
drv->shutdown(dev);
}
static int mcde_drv_suspend(struct device *_dev, pm_message_t state)
{
struct mcde_display_driver *drv = to_mcde_display_driver(_dev->driver);
struct mcde_display_device *dev = to_mcde_display_device(_dev);
if (drv->suspend)
return drv->suspend(dev, state);
else
#if !defined(CONFIG_HAS_EARLYSUSPEND) && defined(CONFIG_PM)
return dev->set_power_mode(dev, MCDE_DISPLAY_PM_OFF);
#else
return 0;
#endif
}
static int mcde_drv_resume(struct device *_dev)
{
struct mcde_display_driver *drv = to_mcde_display_driver(_dev->driver);
struct mcde_display_device *dev = to_mcde_display_device(_dev);
if (drv->resume)
return drv->resume(dev);
else
#if !defined(CONFIG_HAS_EARLYSUSPEND) && defined(CONFIG_PM)
return dev->set_power_mode(dev, MCDE_DISPLAY_PM_STANDBY);
#else
return 0;
#endif
}
/* Bus device */
static void mcde_bus_release(struct device *dev)
{
}
struct device mcde_bus = {
.init_name = "mcde_bus",
.release = mcde_bus_release
};
/* Public bus API */
int mcde_display_driver_register(struct mcde_display_driver *drv)
{
drv->driver.bus = &mcde_bus_type;
if (drv->probe)
drv->driver.probe = mcde_drv_probe;
if (drv->remove)
drv->driver.remove = mcde_drv_remove;
if (drv->shutdown)
drv->driver.shutdown = mcde_drv_shutdown;
drv->driver.suspend = mcde_drv_suspend;
drv->driver.resume = mcde_drv_resume;
return driver_register(&drv->driver);
}
EXPORT_SYMBOL(mcde_display_driver_register);
void mcde_display_driver_unregister(struct mcde_display_driver *drv)
{
driver_unregister(&drv->driver);
}
EXPORT_SYMBOL(mcde_display_driver_unregister);
static void mcde_display_dev_release(struct device *dev)
{
/* Do nothing */
}
int mcde_display_device_register(struct mcde_display_device *dev)
{
/* Setup device */
if (!dev)
return -EINVAL;
dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
dev->dev.bus = &mcde_bus_type;
if (dev->dev.parent != NULL)
dev->dev.parent = &mcde_bus;
dev->dev.release = mcde_display_dev_release;
if (dev->id != -1)
dev_set_name(&dev->dev, "%s.%d", dev->name, dev->id);
else
dev_set_name(&dev->dev, dev->name);
mcde_display_init_device(dev);
return device_register(&dev->dev);
}
EXPORT_SYMBOL(mcde_display_device_register);
void mcde_display_device_unregister(struct mcde_display_device *dev)
{
device_unregister(&dev->dev);
}
EXPORT_SYMBOL(mcde_display_device_unregister);
/* Notifications */
int mcde_dss_register_notifier(struct notifier_block *nb)
{
return blocking_notifier_chain_register(&bus_notifier_list, nb);
}
EXPORT_SYMBOL(mcde_dss_register_notifier);
int mcde_dss_unregister_notifier(struct notifier_block *nb)
{
return blocking_notifier_chain_unregister(&bus_notifier_list, nb);
}
EXPORT_SYMBOL(mcde_dss_unregister_notifier);
static int bus_notify_callback(struct notifier_block *nb,
unsigned long event, void *dev)
{
struct mcde_display_device *ddev = to_mcde_display_device(dev);
if (event == BUS_NOTIFY_BOUND_DRIVER) {
ddev->initialized = true;
blocking_notifier_call_chain(&bus_notifier_list,
MCDE_DSS_EVENT_DISPLAY_REGISTERED, ddev);
} else if (event == BUS_NOTIFY_UNBIND_DRIVER) {
ddev->initialized = false;
blocking_notifier_call_chain(&bus_notifier_list,
MCDE_DSS_EVENT_DISPLAY_UNREGISTERED, ddev);
}
return 0;
}
struct notifier_block bus_nb = {
.notifier_call = bus_notify_callback,
};
/* Driver init/exit */
int __init mcde_display_init(void)
{
int ret;
ret = bus_register(&mcde_bus_type);
if (ret) {
pr_warning("Unable to register bus type\n");
goto no_bus_registration;
}
ret = device_register(&mcde_bus);
if (ret) {
pr_warning("Unable to register bus device\n");
goto no_device_registration;
}
ret = bus_register_notifier(&mcde_bus_type, &bus_nb);
if (ret) {
pr_warning("Unable to register bus notifier\n");
goto no_bus_notifier;
}
goto out;
no_bus_notifier:
device_unregister(&mcde_bus);
no_device_registration:
bus_unregister(&mcde_bus_type);
no_bus_registration:
out:
return ret;
}
void mcde_display_exit(void)
{
bus_unregister_notifier(&mcde_bus_type, &bus_nb);
device_unregister(&mcde_bus);
bus_unregister(&mcde_bus_type);
}
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