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/*
* Qualcomm Technologies HIDMA Management SYS interface
*
* Copyright (c) 2015, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* 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.
*/
#include <linux/sysfs.h>
#include <linux/platform_device.h>
#include "hidma_mgmt.h"
struct hidma_chan_attr {
struct hidma_mgmt_dev *mdev;
int index;
struct kobj_attribute attr;
};
struct hidma_mgmt_fileinfo {
char *name;
int mode;
int (*get)(struct hidma_mgmt_dev *mdev);
int (*set)(struct hidma_mgmt_dev *mdev, u64 val);
};
#define IMPLEMENT_GETSET(name) \
static int get_##name(struct hidma_mgmt_dev *mdev) \
{ \
return mdev->name; \
} \
static int set_##name(struct hidma_mgmt_dev *mdev, u64 val) \
{ \
u64 tmp; \
int rc; \
\
tmp = mdev->name; \
mdev->name = val; \
rc = hidma_mgmt_setup(mdev); \
if (rc) \
mdev->name = tmp; \
return rc; \
}
#define DECLARE_ATTRIBUTE(name, mode) \
{#name, mode, get_##name, set_##name}
IMPLEMENT_GETSET(hw_version_major)
IMPLEMENT_GETSET(hw_version_minor)
IMPLEMENT_GETSET(max_wr_xactions)
IMPLEMENT_GETSET(max_rd_xactions)
IMPLEMENT_GETSET(max_write_request)
IMPLEMENT_GETSET(max_read_request)
IMPLEMENT_GETSET(dma_channels)
IMPLEMENT_GETSET(chreset_timeout_cycles)
static int set_priority(struct hidma_mgmt_dev *mdev, unsigned int i, u64 val)
{
u64 tmp;
int rc;
if (i >= mdev->dma_channels)
return -EINVAL;
tmp = mdev->priority[i];
mdev->priority[i] = val;
rc = hidma_mgmt_setup(mdev);
if (rc)
mdev->priority[i] = tmp;
return rc;
}
static int set_weight(struct hidma_mgmt_dev *mdev, unsigned int i, u64 val)
{
u64 tmp;
int rc;
if (i >= mdev->dma_channels)
return -EINVAL;
tmp = mdev->weight[i];
mdev->weight[i] = val;
rc = hidma_mgmt_setup(mdev);
if (rc)
mdev->weight[i] = tmp;
return rc;
}
static struct hidma_mgmt_fileinfo hidma_mgmt_files[] = {
DECLARE_ATTRIBUTE(hw_version_major, S_IRUGO),
DECLARE_ATTRIBUTE(hw_version_minor, S_IRUGO),
DECLARE_ATTRIBUTE(dma_channels, S_IRUGO),
DECLARE_ATTRIBUTE(chreset_timeout_cycles, S_IRUGO),
DECLARE_ATTRIBUTE(max_wr_xactions, S_IRUGO),
DECLARE_ATTRIBUTE(max_rd_xactions, S_IRUGO),
DECLARE_ATTRIBUTE(max_write_request, S_IRUGO),
DECLARE_ATTRIBUTE(max_read_request, S_IRUGO),
};
static ssize_t show_values(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct platform_device *pdev = to_platform_device(dev);
struct hidma_mgmt_dev *mdev = platform_get_drvdata(pdev);
unsigned int i;
buf[0] = 0;
for (i = 0; i < ARRAY_SIZE(hidma_mgmt_files); i++) {
if (strcmp(attr->attr.name, hidma_mgmt_files[i].name) == 0) {
sprintf(buf, "%d\n", hidma_mgmt_files[i].get(mdev));
break;
}
}
return strlen(buf);
}
static ssize_t set_values(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct platform_device *pdev = to_platform_device(dev);
struct hidma_mgmt_dev *mdev = platform_get_drvdata(pdev);
unsigned long tmp;
unsigned int i;
int rc;
rc = kstrtoul(buf, 0, &tmp);
if (rc)
return rc;
for (i = 0; i < ARRAY_SIZE(hidma_mgmt_files); i++) {
if (strcmp(attr->attr.name, hidma_mgmt_files[i].name) == 0) {
rc = hidma_mgmt_files[i].set(mdev, tmp);
if (rc)
return rc;
break;
}
}
return count;
}
static ssize_t show_values_channel(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
struct hidma_chan_attr *chattr;
struct hidma_mgmt_dev *mdev;
buf[0] = 0;
chattr = container_of(attr, struct hidma_chan_attr, attr);
mdev = chattr->mdev;
if (strcmp(attr->attr.name, "priority") == 0)
sprintf(buf, "%d\n", mdev->priority[chattr->index]);
else if (strcmp(attr->attr.name, "weight") == 0)
sprintf(buf, "%d\n", mdev->weight[chattr->index]);
return strlen(buf);
}
static ssize_t set_values_channel(struct kobject *kobj,
struct kobj_attribute *attr, const char *buf,
size_t count)
{
struct hidma_chan_attr *chattr;
struct hidma_mgmt_dev *mdev;
unsigned long tmp;
int rc;
chattr = container_of(attr, struct hidma_chan_attr, attr);
mdev = chattr->mdev;
rc = kstrtoul(buf, 0, &tmp);
if (rc)
return rc;
if (strcmp(attr->attr.name, "priority") == 0) {
rc = set_priority(mdev, chattr->index, tmp);
if (rc)
return rc;
} else if (strcmp(attr->attr.name, "weight") == 0) {
rc = set_weight(mdev, chattr->index, tmp);
if (rc)
return rc;
}
return count;
}
static int create_sysfs_entry(struct hidma_mgmt_dev *dev, char *name, int mode)
{
struct device_attribute *attrs;
char *name_copy;
attrs = devm_kmalloc(&dev->pdev->dev,
sizeof(struct device_attribute), GFP_KERNEL);
if (!attrs)
return -ENOMEM;
name_copy = devm_kstrdup(&dev->pdev->dev, name, GFP_KERNEL);
if (!name_copy)
return -ENOMEM;
attrs->attr.name = name_copy;
attrs->attr.mode = mode;
attrs->show = show_values;
attrs->store = set_values;
sysfs_attr_init(&attrs->attr);
return device_create_file(&dev->pdev->dev, attrs);
}
static int create_sysfs_entry_channel(struct hidma_mgmt_dev *mdev, char *name,
int mode, int index,
struct kobject *parent)
{
struct hidma_chan_attr *chattr;
char *name_copy;
chattr = devm_kmalloc(&mdev->pdev->dev, sizeof(*chattr), GFP_KERNEL);
if (!chattr)
return -ENOMEM;
name_copy = devm_kstrdup(&mdev->pdev->dev, name, GFP_KERNEL);
if (!name_copy)
return -ENOMEM;
chattr->mdev = mdev;
chattr->index = index;
chattr->attr.attr.name = name_copy;
chattr->attr.attr.mode = mode;
chattr->attr.show = show_values_channel;
chattr->attr.store = set_values_channel;
sysfs_attr_init(&chattr->attr.attr);
return sysfs_create_file(parent, &chattr->attr.attr);
}
int hidma_mgmt_init_sys(struct hidma_mgmt_dev *mdev)
{
unsigned int i;
int rc;
int required;
struct kobject *chanops;
required = sizeof(*mdev->chroots) * mdev->dma_channels;
mdev->chroots = devm_kmalloc(&mdev->pdev->dev, required, GFP_KERNEL);
if (!mdev->chroots)
return -ENOMEM;
chanops = kobject_create_and_add("chanops", &mdev->pdev->dev.kobj);
if (!chanops)
return -ENOMEM;
/* create each channel directory here */
for (i = 0; i < mdev->dma_channels; i++) {
char name[20];
snprintf(name, sizeof(name), "chan%d", i);
mdev->chroots[i] = kobject_create_and_add(name, chanops);
if (!mdev->chroots[i])
return -ENOMEM;
}
/* populate common parameters */
for (i = 0; i < ARRAY_SIZE(hidma_mgmt_files); i++) {
rc = create_sysfs_entry(mdev, hidma_mgmt_files[i].name,
hidma_mgmt_files[i].mode);
if (rc)
return rc;
}
/* populate parameters that are per channel */
for (i = 0; i < mdev->dma_channels; i++) {
rc = create_sysfs_entry_channel(mdev, "priority",
(S_IRUGO | S_IWUGO), i,
mdev->chroots[i]);
if (rc)
return rc;
rc = create_sysfs_entry_channel(mdev, "weight",
(S_IRUGO | S_IWUGO), i,
mdev->chroots[i]);
if (rc)
return rc;
}
return 0;
}
EXPORT_SYMBOL_GPL(hidma_mgmt_init_sys);
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