/*
* Copyright (c) 2011 Synaptics Incorporated
* Copyright (c) 2011 Unixphere
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/pm.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/rmi.h>
static struct rmi_function_list {
struct list_head list;
struct rmi_function_handler *fh;
} rmi_supported_functions;
static int rmi_bus_match(struct device *dev, struct device_driver *driver)
{
struct rmi_driver *rmi_driver;
struct rmi_device *rmi_dev;
struct rmi_device_platform_data *pdata;
pr_info("in function ____%s____ \n", __func__);
rmi_driver = to_rmi_driver(driver);
rmi_dev = to_rmi_device(dev);
pdata = to_rmi_platform_data(rmi_dev);
pr_info(" rmi_driver->driver.name = %s\n", rmi_driver->driver.name);
pr_info(" device:rmi_device = 0x%x \n", rmi_dev);
pr_info(" device:rmi_device:rmi_device_platform_data:driver_name = %s \n", pdata->driver_name);
pr_info(" rmi_device:driver = 0x%x \n", rmi_dev->driver);
if (!strcmp(pdata->driver_name, rmi_driver->driver.name)) {
rmi_dev->driver = rmi_driver;
pr_info(" names match, so now rmi_device:driver = 0x%x \n",rmi_dev->driver);
return 1;
}
pr_info(" names DO NOT match, so return nothing \n");
return 0;
}
#ifdef CONFIG_PM
static int rmi_bus_suspend(struct device *dev)
{
#ifdef GENERIC_SUBSYS_PM_OPS
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
if (pm && pm->suspend)
return pm->suspend(dev);
#endif
return 0;
}
static int rmi_bus_resume(struct device *dev)
{
#ifdef GENERIC_SUBSYS_PM_OPS
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
pr_info("in function ____%s____ \n", __func__);
if (pm && pm->resume)
return pm->resume(dev);
#endif
return 0;
}
#endif
static int rmi_bus_probe(struct device *dev)
{
struct rmi_driver *driver;
struct rmi_device *rmi_dev = to_rmi_device(dev);
pr_info("in function ____%s____ \n", __func__);
driver = rmi_dev->driver;
if (driver && driver->probe)
return driver->probe(rmi_dev);
return 0;
}
static int rmi_bus_remove(struct device *dev)
{
struct rmi_driver *driver;
struct rmi_device *rmi_dev = to_rmi_device(dev);
pr_info("in function ____%s____ \n", __func__);
driver = rmi_dev->driver;
if (driver && driver->remove)
return driver->remove(rmi_dev);
return 0;
}
static void rmi_bus_shutdown(struct device *dev)
{
struct rmi_driver *driver;
struct rmi_device *rmi_dev = to_rmi_device(dev);
driver = rmi_dev->driver;
if (driver && driver->shutdown)
driver->shutdown(rmi_dev);
}
static SIMPLE_DEV_PM_OPS(rmi_bus_pm_ops,
rmi_bus_suspend, rmi_bus_resume);
struct bus_type rmi_bus_type = {
.name = "rmi",
.match = rmi_bus_match,
.probe = rmi_bus_probe,
.remove = rmi_bus_remove,
.shutdown = rmi_bus_shutdown,
.pm = &rmi_bus_pm_ops
};
int rmi_register_phys_device(struct rmi_phys_device *phys)
{
static int phys_device_num;
struct rmi_device_platform_data *pdata = phys->dev->platform_data;
struct rmi_device *rmi_dev;
pr_info("in function ____%s____ \n", __func__);
if (!pdata) {
dev_err(phys->dev, "no platform data!\n");
return -EINVAL;
}
rmi_dev = kzalloc(sizeof(struct rmi_device), GFP_KERNEL);
if (!rmi_dev)
return -ENOMEM;
rmi_dev->phys = phys;
rmi_dev->dev.bus = &rmi_bus_type;
dev_set_name(&rmi_dev->dev, "sensor%02d", phys_device_num++);
phys->rmi_dev = rmi_dev;
pr_info(" registering physical device:\n");
pr_info(" dev.init_name = \n", rmi_dev->dev.init_name);
pr_info(" dev.bus->name = \n", rmi_dev->dev.bus->name);
return device_register(&rmi_dev->dev);
}
EXPORT_SYMBOL(rmi_register_phys_device);
void rmi_unregister_phys_device(struct rmi_phys_device *phys)
{
struct rmi_device *rmi_dev = phys->rmi_dev;
pr_info("in function ____%s____ \n", __func__);
device_unregister(&rmi_dev->dev);
kfree(rmi_dev);
}
EXPORT_SYMBOL(rmi_unregister_phys_device);
int rmi_register_driver(struct rmi_driver *driver)
{
pr_info("in function ____%s____ \n", __func__);
driver->driver.bus = &rmi_bus_type;
return driver_register(&driver->driver);
}
EXPORT_SYMBOL(rmi_register_driver);
static int __rmi_driver_remove(struct device *dev, void *data)
{
struct rmi_driver *driver = data;
struct rmi_device *rmi_dev = to_rmi_device(dev);
if (rmi_dev->driver == driver)
rmi_dev->driver = NULL;
return 0;
}
void rmi_unregister_driver(struct rmi_driver *driver)
{
bus_for_each_dev(&rmi_bus_type, NULL, driver, __rmi_driver_remove);
driver_unregister(&driver->driver);
}
EXPORT_SYMBOL(rmi_unregister_driver);
static int __rmi_bus_fh_add(struct device *dev, void *data)
{
struct rmi_driver *driver;
struct rmi_device *rmi_dev = to_rmi_device(dev);
pr_info("in function ____%s____ \n", __func__);
driver = rmi_dev->driver;
if (driver && driver->fh_add)
driver->fh_add(rmi_dev, data);
return 0;
}
int rmi_register_function_driver(struct rmi_function_handler *fh)
{
struct rmi_function_list *entry;
struct rmi_function_handler *fh_dup;
fh_dup = rmi_get_function_handler(fh->func);
if (fh_dup) {
pr_err("%s: function f%.2x already registered!\n", __func__,
fh->func);
return -EINVAL;
}
entry = kzalloc(sizeof(struct rmi_function_list), GFP_KERNEL);
if (!entry)
return -ENOMEM;
entry->fh = fh;
list_add_tail(&entry->list, &rmi_supported_functions.list);
/* notify devices of the new function handler */
bus_for_each_dev(&rmi_bus_type, NULL, fh, __rmi_bus_fh_add);
return 0;
}
EXPORT_SYMBOL(rmi_register_function_driver);
static int __rmi_bus_fh_remove(struct device *dev, void *data)
{
struct rmi_driver *driver;
struct rmi_device *rmi_dev = to_rmi_device(dev);
pr_info("in function ____%s____ \n", __func__);
driver = rmi_dev->driver;
if (driver && driver->fh_remove)
driver->fh_remove(rmi_dev, data);
return 0;
}
void rmi_unregister_function_driver(struct rmi_function_handler *fh)
{
struct rmi_function_list *entry, *n;
pr_info("in function ____%s____ \n", __func__);
/* notify devices of the removal of the function handler */
bus_for_each_dev(&rmi_bus_type, NULL, fh, __rmi_bus_fh_remove);
list_for_each_entry_safe(entry, n, &rmi_supported_functions.list, list)
if (entry->fh->func == fh->func) {
list_del(&entry->list);
kfree(entry);
}
}
EXPORT_SYMBOL(rmi_unregister_function_driver);
struct rmi_function_handler *rmi_get_function_handler(int id)
{
struct rmi_function_list *entry;
pr_info("in function ____%s____ \n", __func__);
list_for_each_entry(entry, &rmi_supported_functions.list, list)
if (entry->fh->func == id)
return entry->fh;
return NULL;
}
EXPORT_SYMBOL(rmi_get_function_handler);
static int __init rmi_bus_init(void)
{
int error;
pr_info("in function ____%s____ \n", __func__);
INIT_LIST_HEAD(&rmi_supported_functions.list);
error = bus_register(&rmi_bus_type);
if (error < 0) {
pr_err("%s: error registering the RMI bus: %d\n", __func__,
error);
return error;
}
pr_info("%s: successfully registered RMI bus.\n", __func__);
return 0;
}
static void __exit rmi_bus_exit(void)
{
struct rmi_function_list *entry, *n;
pr_info("in function ____%s____ \n", __func__);
list_for_each_entry_safe(entry, n, &rmi_supported_functions.list,
list) {
list_del(&entry->list);
kfree(entry);
}
bus_unregister(&rmi_bus_type);
}
module_init(rmi_bus_init);
module_exit(rmi_bus_exit);
MODULE_AUTHOR("Eric Andersson <eric.andersson@unixphere.com>");
MODULE_DESCRIPTION("RMI bus");
MODULE_LICENSE("GPL");
