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