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/*
* Copyright (c) 2017-2019, NVIDIA Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
*/
#include "device-group.h"
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/types.h>
#include "drivers/video/tegra/host/nvhost_acm.h"
struct camrtc_device_group {
struct device *dev;
char const *names_name;
int ndevices;
struct platform_device *devices[];
};
static int get_grouped_device(struct camrtc_device_group *grp,
struct device *dev, char const *name, int index)
{
struct device_node *np;
struct platform_device *pdev;
np = of_parse_phandle(dev->of_node, name, index);
if (np == NULL)
return 0;
pdev = of_find_device_by_node(np);
of_node_put(np);
if (pdev == NULL) {
dev_info(dev, "%s[%u] node has no device\n", name, index);
return 0;
}
if (pdev->dev.driver == NULL) {
dev_info(dev, "deferring, %s is not probed\n",
dev_name(&pdev->dev));
platform_device_put(pdev);
return -EPROBE_DEFER;
}
grp->devices[index] = pdev;
return 0;
}
static void camrtc_device_group_release(struct device *dev, void *res)
{
const struct camrtc_device_group *grp = res;
int i;
put_device(grp->dev);
for (i = 0; i < grp->ndevices; i++)
platform_device_put(grp->devices[i]);
}
struct camrtc_device_group *camrtc_device_group_get(
struct device *dev,
char const *property_name,
char const *names_property_name)
{
int index, err;
struct camrtc_device_group *grp;
int ndevices;
if (!dev || !dev->of_node)
return ERR_PTR(-EINVAL);
ndevices = of_count_phandle_with_args(dev->of_node,
property_name, NULL);
if (ndevices <= 0)
return ERR_PTR(-ENOENT);
grp = devres_alloc(camrtc_device_group_release,
offsetof(struct camrtc_device_group, devices[ndevices]),
GFP_KERNEL | __GFP_ZERO);
if (!grp)
return ERR_PTR(-ENOMEM);
grp->dev = get_device(dev);
grp->ndevices = ndevices;
grp->names_name = names_property_name;
for (index = 0; index < grp->ndevices; index++) {
err = get_grouped_device(grp, dev, property_name, index);
if (err) {
devres_free(grp);
return ERR_PTR(err);
}
}
devres_add(dev, grp);
return grp;
}
EXPORT_SYMBOL(camrtc_device_group_get);
static inline struct platform_device *platform_device_get(
struct platform_device *pdev)
{
if (pdev != NULL)
get_device(&pdev->dev);
return pdev;
}
struct platform_device *camrtc_device_get_byname(
struct camrtc_device_group *grp,
const char *device_name)
{
int index;
if (grp == NULL)
return ERR_PTR(-EINVAL);
if (grp->names_name == NULL)
return ERR_PTR(-ENOENT);
index = of_property_match_string(grp->dev->of_node, grp->names_name,
device_name);
if (index < 0)
return ERR_PTR(-ENODEV);
if (index >= grp->ndevices)
return ERR_PTR(-ENODEV);
return platform_device_get(grp->devices[index]);
}
int camrtc_device_group_busy(const struct camrtc_device_group *grp)
{
int err = -EINVAL, index, idle;
if (!grp)
return 0;
if (IS_ERR(grp))
return err;
for (index = 0; index < grp->ndevices; index++) {
if (!grp->devices[index])
continue;
err = nvhost_module_busy(grp->devices[index]);
if (err < 0)
goto error;
}
return 0;
error:
for (idle = 0; idle < index; idle++)
nvhost_module_idle(grp->devices[idle]);
return err;
}
EXPORT_SYMBOL(camrtc_device_group_busy);
void camrtc_device_group_idle(const struct camrtc_device_group *grp)
{
int index;
if (IS_ERR_OR_NULL(grp))
return;
for (index = 0; index < grp->ndevices; index++)
if (grp->devices[index])
nvhost_module_idle(grp->devices[index]);
}
EXPORT_SYMBOL(camrtc_device_group_idle);
void camrtc_device_group_reset(const struct camrtc_device_group *grp)
{
int index;
if (!grp)
return;
if (IS_ERR(grp))
return;
for (index = 0; index < grp->ndevices; index++) {
if (!grp->devices[index])
continue;
nvhost_module_reset(grp->devices[index], false);
}
}
EXPORT_SYMBOL(camrtc_device_group_reset);
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