Quelle  pvrusb2-sysfs.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-only
/*
 *
 *  Copyright (C) 2005 Mike Isely <isely@pobox.com>
 */

#include <linux/string.h>
#include <linux/slab.h>
#include "pvrusb2-sysfs.h"
#include "pvrusb2-hdw.h"
#include "pvrusb2-debug.h"
#ifdef CONFIG_VIDEO_PVRUSB2_DEBUGIFC
#include "pvrusb2-debugifc.h"
#endif /* CONFIG_VIDEO_PVRUSB2_DEBUGIFC */

#define pvr2_sysfs_trace(...) pvr2_trace(PVR2_TRACE_SYSFS,__VA_ARGS__)

struct pvr2_sysfs {
 struct pvr2_channel channel;
 struct device *class_dev;
#ifdef CONFIG_VIDEO_PVRUSB2_DEBUGIFC
 struct pvr2_sysfs_debugifc *debugifc;
#endif /* CONFIG_VIDEO_PVRUSB2_DEBUGIFC */
 struct pvr2_sysfs_ctl_item *item_first;
 struct pvr2_sysfs_ctl_item *item_last;
 struct device_attribute attr_v4l_minor_number;
 struct device_attribute attr_v4l_radio_minor_number;
 struct device_attribute attr_unit_number;
 struct device_attribute attr_bus_info;
 struct device_attribute attr_hdw_name;
 struct device_attribute attr_hdw_desc;
 int v4l_minor_number_created_ok;
 int v4l_radio_minor_number_created_ok;
 int unit_number_created_ok;
 int bus_info_created_ok;
 int hdw_name_created_ok;
 int hdw_desc_created_ok;
};

#ifdef CONFIG_VIDEO_PVRUSB2_DEBUGIFC
struct pvr2_sysfs_debugifc {
 struct device_attribute attr_debugcmd;
 struct device_attribute attr_debuginfo;
 int debugcmd_created_ok;
 int debuginfo_created_ok;
};
#endif /* CONFIG_VIDEO_PVRUSB2_DEBUGIFC */

struct pvr2_sysfs_ctl_item {
 struct device_attribute attr_name;
 struct device_attribute attr_type;
 struct device_attribute attr_min;
 struct device_attribute attr_max;
 struct device_attribute attr_def;
 struct device_attribute attr_enum;
 struct device_attribute attr_bits;
 struct device_attribute attr_val;
 struct device_attribute attr_custom;
 struct pvr2_ctrl *cptr;
 int ctl_id;
 struct pvr2_sysfs *chptr;
 struct pvr2_sysfs_ctl_item *item_next;
 struct attribute *attr_gen[8];
 struct attribute_group grp;
 int created_ok;
 char name[80];
};

static ssize_t show_name(struct device *class_dev,
    struct device_attribute *attr,
    char *buf)
{
 struct pvr2_sysfs_ctl_item *cip;
 const char *name;
 cip = container_of(attr, struct pvr2_sysfs_ctl_item, attr_name);
 name = pvr2_ctrl_get_desc(cip->cptr);
 pvr2_sysfs_trace("pvr2_sysfs(%p) show_name(cid=%d) is %s",
    cip->chptr, cip->ctl_id, name);
 if (!name) return -EINVAL;
 return sysfs_emit(buf, "%s\n", name);
}

static ssize_t show_type(struct device *class_dev,
    struct device_attribute *attr,
    char *buf)
{
 struct pvr2_sysfs_ctl_item *cip;
 const char *name;
 enum pvr2_ctl_type tp;
 cip = container_of(attr, struct pvr2_sysfs_ctl_item, attr_type);
 tp = pvr2_ctrl_get_type(cip->cptr);
 switch (tp) {
 case pvr2_ctl_int: name = "integer"; break;
 case pvr2_ctl_enum: name = "enum"; break;
 case pvr2_ctl_bitmask: name = "bitmask"; break;
 case pvr2_ctl_bool: name = "boolean"; break;
 default: name = "?"; break;
 }
 pvr2_sysfs_trace("pvr2_sysfs(%p) show_type(cid=%d) is %s",
    cip->chptr, cip->ctl_id, name);
 return sysfs_emit(buf, "%s\n", name);
}

static ssize_t show_min(struct device *class_dev,
   struct device_attribute *attr,
   char *buf)
{
 struct pvr2_sysfs_ctl_item *cip;
 long val;
 cip = container_of(attr, struct pvr2_sysfs_ctl_item, attr_min);
 val = pvr2_ctrl_get_min(cip->cptr);
 pvr2_sysfs_trace("pvr2_sysfs(%p) show_min(cid=%d) is %ld",
    cip->chptr, cip->ctl_id, val);
 return sysfs_emit(buf, "%ld\n", val);
}

static ssize_t show_max(struct device *class_dev,
   struct device_attribute *attr,
   char *buf)
{
 struct pvr2_sysfs_ctl_item *cip;
 long val;
 cip = container_of(attr, struct pvr2_sysfs_ctl_item, attr_max);
 val = pvr2_ctrl_get_max(cip->cptr);
 pvr2_sysfs_trace("pvr2_sysfs(%p) show_max(cid=%d) is %ld",
    cip->chptr, cip->ctl_id, val);
 return sysfs_emit(buf, "%ld\n", val);
}

static ssize_t show_def(struct device *class_dev,
   struct device_attribute *attr,
   char *buf)
{
 struct pvr2_sysfs_ctl_item *cip;
 int val;
 int ret;
 unsigned int cnt = 0;
 cip = container_of(attr, struct pvr2_sysfs_ctl_item, attr_def);
 ret = pvr2_ctrl_get_def(cip->cptr, &val);
 if (ret < 0) return ret;
 ret = pvr2_ctrl_value_to_sym(cip->cptr, ~0, val,
         buf, PAGE_SIZE - 1, &cnt);
 pvr2_sysfs_trace("pvr2_sysfs(%p) show_def(cid=%d) is %.*s (%d)",
    cip->chptr, cip->ctl_id, cnt, buf, val);
 buf[cnt] = '\n';
 return cnt + 1;
}

static ssize_t show_val_norm(struct device *class_dev,
        struct device_attribute *attr,
        char *buf)
{
 struct pvr2_sysfs_ctl_item *cip;
 int val;
 int ret;
 unsigned int cnt = 0;
 cip = container_of(attr, struct pvr2_sysfs_ctl_item, attr_val);
 ret = pvr2_ctrl_get_value(cip->cptr, &val);
 if (ret < 0) return ret;
 ret = pvr2_ctrl_value_to_sym(cip->cptr, ~0, val,
         buf, PAGE_SIZE - 1, &cnt);
 pvr2_sysfs_trace("pvr2_sysfs(%p) show_val_norm(cid=%d) is %.*s (%d)",
    cip->chptr, cip->ctl_id, cnt, buf, val);
 buf[cnt] = '\n';
 return cnt+1;
}

static ssize_t show_val_custom(struct device *class_dev,
          struct device_attribute *attr,
          char *buf)
{
 struct pvr2_sysfs_ctl_item *cip;
 int val;
 int ret;
 unsigned int cnt = 0;
 cip = container_of(attr, struct pvr2_sysfs_ctl_item, attr_custom);
 ret = pvr2_ctrl_get_value(cip->cptr, &val);
 if (ret < 0) return ret;
 ret = pvr2_ctrl_custom_value_to_sym(cip->cptr, ~0, val,
         buf, PAGE_SIZE - 1, &cnt);
 pvr2_sysfs_trace("pvr2_sysfs(%p) show_val_custom(cid=%d) is %.*s (%d)",
    cip->chptr, cip->ctl_id, cnt, buf, val);
 buf[cnt] = '\n';
 return cnt+1;
}

static ssize_t show_enum(struct device *class_dev,
    struct device_attribute *attr,
    char *buf)
{
 struct pvr2_sysfs_ctl_item *cip;
 long val;
 unsigned int bcnt, ccnt, ecnt;
 cip = container_of(attr, struct pvr2_sysfs_ctl_item, attr_enum);
 ecnt = pvr2_ctrl_get_cnt(cip->cptr);
 bcnt = 0;
 for (val = 0; val < ecnt; val++) {
  pvr2_ctrl_get_valname(cip->cptr, val, buf + bcnt,
          PAGE_SIZE - bcnt, &ccnt);
  if (!ccnt) continue;
  bcnt += ccnt;
  if (bcnt >= PAGE_SIZE) break;
  buf[bcnt] = '\n';
  bcnt++;
 }
 pvr2_sysfs_trace("pvr2_sysfs(%p) show_enum(cid=%d)",
    cip->chptr, cip->ctl_id);
 return bcnt;
}

static ssize_t show_bits(struct device *class_dev,
    struct device_attribute *attr,
    char *buf)
{
 struct pvr2_sysfs_ctl_item *cip;
 int valid_bits, msk;
 unsigned int bcnt, ccnt;
 cip = container_of(attr, struct pvr2_sysfs_ctl_item, attr_bits);
 valid_bits = pvr2_ctrl_get_mask(cip->cptr);
 bcnt = 0;
 for (msk = 1; valid_bits; msk <<= 1) {
  if (!(msk & valid_bits)) continue;
  valid_bits &= ~msk;
  pvr2_ctrl_get_valname(cip->cptr, msk, buf + bcnt,
          PAGE_SIZE - bcnt, &ccnt);
  bcnt += ccnt;
  if (bcnt >= PAGE_SIZE) break;
  buf[bcnt] = '\n';
  bcnt++;
 }
 pvr2_sysfs_trace("pvr2_sysfs(%p) show_bits(cid=%d)",
    cip->chptr, cip->ctl_id);
 return bcnt;
}

static int store_val_any(struct pvr2_sysfs_ctl_item *cip, int customfl,
    const char *buf,unsigned int count)
{
 int ret;
 int mask,val;
 if (customfl) {
  ret = pvr2_ctrl_custom_sym_to_value(cip->cptr, buf, count,
          &mask, &val);
 } else {
  ret = pvr2_ctrl_sym_to_value(cip->cptr, buf, count,
          &mask, &val);
 }
 if (ret < 0) return ret;
 ret = pvr2_ctrl_set_mask_value(cip->cptr, mask, val);
 pvr2_hdw_commit_ctl(cip->chptr->channel.hdw);
 return ret;
}

static ssize_t store_val_norm(struct device *class_dev,
         struct device_attribute *attr,
         const char *buf, size_t count)
{
 struct pvr2_sysfs_ctl_item *cip;
 int ret;
 cip = container_of(attr, struct pvr2_sysfs_ctl_item, attr_val);
 pvr2_sysfs_trace("pvr2_sysfs(%p) store_val_norm(cid=%d) \"%.*s\"",
    cip->chptr, cip->ctl_id, (int)count, buf);
 ret = store_val_any(cip, 0, buf, count);
 if (!ret) ret = count;
 return ret;
}

static ssize_t store_val_custom(struct device *class_dev,
    struct device_attribute *attr,
    const char *buf, size_t count)
{
 struct pvr2_sysfs_ctl_item *cip;
 int ret;
 cip = container_of(attr, struct pvr2_sysfs_ctl_item, attr_custom);
 pvr2_sysfs_trace("pvr2_sysfs(%p) store_val_custom(cid=%d) \"%.*s\"",
    cip->chptr, cip->ctl_id, (int)count, buf);
 ret = store_val_any(cip, 1, buf, count);
 if (!ret) ret = count;
 return ret;
}

static void pvr2_sysfs_add_control(struct pvr2_sysfs *sfp,int ctl_id)
{
 struct pvr2_sysfs_ctl_item *cip;
 struct pvr2_ctrl *cptr;
 unsigned int cnt,acnt;
 int ret;

 cptr = pvr2_hdw_get_ctrl_by_index(sfp->channel.hdw,ctl_id);
 if (!cptr) return;

 cip = kzalloc(sizeof(*cip),GFP_KERNEL);
 if (!cip) return;
 pvr2_sysfs_trace("Creating pvr2_sysfs_ctl_item id=%p",cip);

 cip->cptr = cptr;
 cip->ctl_id = ctl_id;

 cip->chptr = sfp;
 cip->item_next = NULL;
 if (sfp->item_last) {
  sfp->item_last->item_next = cip;
 } else {
  sfp->item_first = cip;
 }
 sfp->item_last = cip;

 sysfs_attr_init(&cip->attr_name.attr);
 cip->attr_name.attr.name = "name";
 cip->attr_name.attr.mode = S_IRUGO;
 cip->attr_name.show = show_name;

 sysfs_attr_init(&cip->attr_type.attr);
 cip->attr_type.attr.name = "type";
 cip->attr_type.attr.mode = S_IRUGO;
 cip->attr_type.show = show_type;

 sysfs_attr_init(&cip->attr_min.attr);
 cip->attr_min.attr.name = "min_val";
 cip->attr_min.attr.mode = S_IRUGO;
 cip->attr_min.show = show_min;

 sysfs_attr_init(&cip->attr_max.attr);
 cip->attr_max.attr.name = "max_val";
 cip->attr_max.attr.mode = S_IRUGO;
 cip->attr_max.show = show_max;

 sysfs_attr_init(&cip->attr_def.attr);
 cip->attr_def.attr.name = "def_val";
 cip->attr_def.attr.mode = S_IRUGO;
 cip->attr_def.show = show_def;

 sysfs_attr_init(&cip->attr_val.attr);
 cip->attr_val.attr.name = "cur_val";
 cip->attr_val.attr.mode = S_IRUGO;

 sysfs_attr_init(&cip->attr_custom.attr);
 cip->attr_custom.attr.name = "custom_val";
 cip->attr_custom.attr.mode = S_IRUGO;

 sysfs_attr_init(&cip->attr_enum.attr);
 cip->attr_enum.attr.name = "enum_val";
 cip->attr_enum.attr.mode = S_IRUGO;
 cip->attr_enum.show = show_enum;

 sysfs_attr_init(&cip->attr_bits.attr);
 cip->attr_bits.attr.name = "bit_val";
 cip->attr_bits.attr.mode = S_IRUGO;
 cip->attr_bits.show = show_bits;

 if (pvr2_ctrl_is_writable(cptr)) {
  cip->attr_val.attr.mode |= S_IWUSR|S_IWGRP;
  cip->attr_custom.attr.mode |= S_IWUSR|S_IWGRP;
 }

 acnt = 0;
 cip->attr_gen[acnt++] = &cip->attr_name.attr;
 cip->attr_gen[acnt++] = &cip->attr_type.attr;
 cip->attr_gen[acnt++] = &cip->attr_val.attr;
 cip->attr_gen[acnt++] = &cip->attr_def.attr;
 cip->attr_val.show = show_val_norm;
 cip->attr_val.store = store_val_norm;
 if (pvr2_ctrl_has_custom_symbols(cptr)) {
  cip->attr_gen[acnt++] = &cip->attr_custom.attr;
  cip->attr_custom.show = show_val_custom;
  cip->attr_custom.store = store_val_custom;
 }
 switch (pvr2_ctrl_get_type(cptr)) {
 case pvr2_ctl_enum:
  // Control is an enumeration
  cip->attr_gen[acnt++] = &cip->attr_enum.attr;
  break;
 case pvr2_ctl_int:
  // Control is an integer
  cip->attr_gen[acnt++] = &cip->attr_min.attr;
  cip->attr_gen[acnt++] = &cip->attr_max.attr;
  break;
 case pvr2_ctl_bitmask:
  // Control is an bitmask
  cip->attr_gen[acnt++] = &cip->attr_bits.attr;
  break;
 default: break;
 }

 cnt = scnprintf(cip->name,sizeof(cip->name)-1,"ctl_%s",
   pvr2_ctrl_get_name(cptr));
 cip->name[cnt] = 0;
 cip->grp.name = cip->name;
 cip->grp.attrs = cip->attr_gen;

 ret = sysfs_create_group(&sfp->class_dev->kobj,&cip->grp);
 if (ret) {
  pvr2_trace(PVR2_TRACE_ERROR_LEGS,
      "sysfs_create_group error: %d",
      ret);
  return;
 }
 cip->created_ok = !0;
}

#ifdef CONFIG_VIDEO_PVRUSB2_DEBUGIFC
static ssize_t debuginfo_show(struct device *, struct device_attribute *,
         char *);
static ssize_t debugcmd_show(struct device *, struct device_attribute *,
        char *);
static ssize_t debugcmd_store(struct device *, struct device_attribute *,
         const char *, size_t count);

static void pvr2_sysfs_add_debugifc(struct pvr2_sysfs *sfp)
{
 struct pvr2_sysfs_debugifc *dip;
 int ret;

 dip = kzalloc(sizeof(*dip),GFP_KERNEL);
 if (!dip) return;
 sysfs_attr_init(&dip->attr_debugcmd.attr);
 dip->attr_debugcmd.attr.name = "debugcmd";
 dip->attr_debugcmd.attr.mode = S_IRUGO|S_IWUSR|S_IWGRP;
 dip->attr_debugcmd.show = debugcmd_show;
 dip->attr_debugcmd.store = debugcmd_store;
 sysfs_attr_init(&dip->attr_debuginfo.attr);
 dip->attr_debuginfo.attr.name = "debuginfo";
 dip->attr_debuginfo.attr.mode = S_IRUGO;
 dip->attr_debuginfo.show = debuginfo_show;
 sfp->debugifc = dip;
 ret = device_create_file(sfp->class_dev,&dip->attr_debugcmd);
 if (ret < 0) {
  pvr2_trace(PVR2_TRACE_ERROR_LEGS,
      "device_create_file error: %d",
      ret);
 } else {
  dip->debugcmd_created_ok = !0;
 }
 ret = device_create_file(sfp->class_dev,&dip->attr_debuginfo);
 if (ret < 0) {
  pvr2_trace(PVR2_TRACE_ERROR_LEGS,
      "device_create_file error: %d",
      ret);
 } else {
  dip->debuginfo_created_ok = !0;
 }
}


static void pvr2_sysfs_tear_down_debugifc(struct pvr2_sysfs *sfp)
{
 if (!sfp->debugifc) return;
 if (sfp->debugifc->debuginfo_created_ok) {
  device_remove_file(sfp->class_dev,
      &sfp->debugifc->attr_debuginfo);
 }
 if (sfp->debugifc->debugcmd_created_ok) {
  device_remove_file(sfp->class_dev,
      &sfp->debugifc->attr_debugcmd);
 }
 kfree(sfp->debugifc);
 sfp->debugifc = NULL;
}
#endif /* CONFIG_VIDEO_PVRUSB2_DEBUGIFC */


static void pvr2_sysfs_add_controls(struct pvr2_sysfs *sfp)
{
 unsigned int idx,cnt;
 cnt = pvr2_hdw_get_ctrl_count(sfp->channel.hdw);
 for (idx = 0; idx < cnt; idx++) {
  pvr2_sysfs_add_control(sfp,idx);
 }
}


static void pvr2_sysfs_tear_down_controls(struct pvr2_sysfs *sfp)
{
 struct pvr2_sysfs_ctl_item *cip1,*cip2;
 for (cip1 = sfp->item_first; cip1; cip1 = cip2) {
  cip2 = cip1->item_next;
  if (cip1->created_ok) {
   sysfs_remove_group(&sfp->class_dev->kobj,&cip1->grp);
  }
  pvr2_sysfs_trace("Destroying pvr2_sysfs_ctl_item id=%p",cip1);
  kfree(cip1);
 }
}


static void pvr2_sysfs_release(struct device *class_dev)
{
 pvr2_sysfs_trace("Releasing class_dev id=%p",class_dev);
 kfree(class_dev);
}


static struct class pvr2_class = {
 .name  = "pvrusb2",
 .dev_release = pvr2_sysfs_release,
};


static void class_dev_destroy(struct pvr2_sysfs *sfp)
{
 struct device *dev;
 if (!sfp->class_dev) return;
#ifdef CONFIG_VIDEO_PVRUSB2_DEBUGIFC
 pvr2_sysfs_tear_down_debugifc(sfp);
#endif /* CONFIG_VIDEO_PVRUSB2_DEBUGIFC */
 pvr2_sysfs_tear_down_controls(sfp);
 if (sfp->hdw_desc_created_ok) {
  device_remove_file(sfp->class_dev,
       &sfp->attr_hdw_desc);
 }
 if (sfp->hdw_name_created_ok) {
  device_remove_file(sfp->class_dev,
       &sfp->attr_hdw_name);
 }
 if (sfp->bus_info_created_ok) {
  device_remove_file(sfp->class_dev,
      &sfp->attr_bus_info);
 }
 if (sfp->v4l_minor_number_created_ok) {
  device_remove_file(sfp->class_dev,
      &sfp->attr_v4l_minor_number);
 }
 if (sfp->v4l_radio_minor_number_created_ok) {
  device_remove_file(sfp->class_dev,
      &sfp->attr_v4l_radio_minor_number);
 }
 if (sfp->unit_number_created_ok) {
  device_remove_file(sfp->class_dev,
      &sfp->attr_unit_number);
 }
 pvr2_sysfs_trace("Destroying class_dev id=%p",sfp->class_dev);
 dev_set_drvdata(sfp->class_dev, NULL);
 dev = sfp->class_dev->parent;
 sfp->class_dev->parent = NULL;
 put_device(dev);
 device_unregister(sfp->class_dev);
 sfp->class_dev = NULL;
}


static ssize_t v4l_minor_number_show(struct device *class_dev,
         struct device_attribute *attr, char *buf)
{
 struct pvr2_sysfs *sfp;
 sfp = dev_get_drvdata(class_dev);
 if (!sfp) return -EINVAL;
 return sysfs_emit(buf, "%d\n",
    pvr2_hdw_v4l_get_minor_number(sfp->channel.hdw,
             pvr2_v4l_type_video));
}


static ssize_t bus_info_show(struct device *class_dev,
        struct device_attribute *attr, char *buf)
{
 struct pvr2_sysfs *sfp;
 sfp = dev_get_drvdata(class_dev);
 if (!sfp) return -EINVAL;
 return sysfs_emit(buf, "%s\n",
    pvr2_hdw_get_bus_info(sfp->channel.hdw));
}


static ssize_t hdw_name_show(struct device *class_dev,
        struct device_attribute *attr, char *buf)
{
 struct pvr2_sysfs *sfp;
 sfp = dev_get_drvdata(class_dev);
 if (!sfp) return -EINVAL;
 return sysfs_emit(buf, "%s\n",
    pvr2_hdw_get_type(sfp->channel.hdw));
}


static ssize_t hdw_desc_show(struct device *class_dev,
        struct device_attribute *attr, char *buf)
{
 struct pvr2_sysfs *sfp;
 sfp = dev_get_drvdata(class_dev);
 if (!sfp) return -EINVAL;
 return sysfs_emit(buf, "%s\n",
    pvr2_hdw_get_desc(sfp->channel.hdw));
}


static ssize_t v4l_radio_minor_number_show(struct device *class_dev,
        struct device_attribute *attr,
        char *buf)
{
 struct pvr2_sysfs *sfp;
 sfp = dev_get_drvdata(class_dev);
 if (!sfp) return -EINVAL;
 return sysfs_emit(buf, "%d\n",
    pvr2_hdw_v4l_get_minor_number(sfp->channel.hdw,
             pvr2_v4l_type_radio));
}


static ssize_t unit_number_show(struct device *class_dev,
    struct device_attribute *attr, char *buf)
{
 struct pvr2_sysfs *sfp;
 sfp = dev_get_drvdata(class_dev);
 if (!sfp) return -EINVAL;
 return sysfs_emit(buf, "%d\n",
    pvr2_hdw_get_unit_number(sfp->channel.hdw));
}


static void class_dev_create(struct pvr2_sysfs *sfp)
{
 struct usb_device *usb_dev;
 struct device *class_dev;
 int ret;

 usb_dev = pvr2_hdw_get_dev(sfp->channel.hdw);
 if (!usb_dev) return;
 class_dev = kzalloc(sizeof(*class_dev),GFP_KERNEL);
 if (!class_dev) return;

 pvr2_sysfs_trace("Creating class_dev id=%p",class_dev);

 class_dev->class = &pvr2_class;

 dev_set_name(class_dev, "%s",
       pvr2_hdw_get_device_identifier(sfp->channel.hdw));

 class_dev->parent = get_device(&usb_dev->dev);

 sfp->class_dev = class_dev;
 dev_set_drvdata(class_dev, sfp);
 ret = device_register(class_dev);
 if (ret) {
  pvr2_trace(PVR2_TRACE_ERROR_LEGS,
      "device_register failed");
  put_device(class_dev);
  return;
 }

 sysfs_attr_init(&sfp->attr_v4l_minor_number.attr);
 sfp->attr_v4l_minor_number.attr.name = "v4l_minor_number";
 sfp->attr_v4l_minor_number.attr.mode = S_IRUGO;
 sfp->attr_v4l_minor_number.show = v4l_minor_number_show;
 sfp->attr_v4l_minor_number.store = NULL;
 ret = device_create_file(sfp->class_dev,
           &sfp->attr_v4l_minor_number);
 if (ret < 0) {
  pvr2_trace(PVR2_TRACE_ERROR_LEGS,
      "device_create_file error: %d",
      ret);
 } else {
  sfp->v4l_minor_number_created_ok = !0;
 }

 sysfs_attr_init(&sfp->attr_v4l_radio_minor_number.attr);
 sfp->attr_v4l_radio_minor_number.attr.name = "v4l_radio_minor_number";
 sfp->attr_v4l_radio_minor_number.attr.mode = S_IRUGO;
 sfp->attr_v4l_radio_minor_number.show = v4l_radio_minor_number_show;
 sfp->attr_v4l_radio_minor_number.store = NULL;
 ret = device_create_file(sfp->class_dev,
           &sfp->attr_v4l_radio_minor_number);
 if (ret < 0) {
  pvr2_trace(PVR2_TRACE_ERROR_LEGS,
      "device_create_file error: %d",
      ret);
 } else {
  sfp->v4l_radio_minor_number_created_ok = !0;
 }

 sysfs_attr_init(&sfp->attr_unit_number.attr);
 sfp->attr_unit_number.attr.name = "unit_number";
 sfp->attr_unit_number.attr.mode = S_IRUGO;
 sfp->attr_unit_number.show = unit_number_show;
 sfp->attr_unit_number.store = NULL;
 ret = device_create_file(sfp->class_dev,&sfp->attr_unit_number);
 if (ret < 0) {
  pvr2_trace(PVR2_TRACE_ERROR_LEGS,
      "device_create_file error: %d",
      ret);
 } else {
  sfp->unit_number_created_ok = !0;
 }

 sysfs_attr_init(&sfp->attr_bus_info.attr);
 sfp->attr_bus_info.attr.name = "bus_info_str";
 sfp->attr_bus_info.attr.mode = S_IRUGO;
 sfp->attr_bus_info.show = bus_info_show;
 sfp->attr_bus_info.store = NULL;
 ret = device_create_file(sfp->class_dev,
           &sfp->attr_bus_info);
 if (ret < 0) {
  pvr2_trace(PVR2_TRACE_ERROR_LEGS,
      "device_create_file error: %d",
      ret);
 } else {
  sfp->bus_info_created_ok = !0;
 }

 sysfs_attr_init(&sfp->attr_hdw_name.attr);
 sfp->attr_hdw_name.attr.name = "device_hardware_type";
 sfp->attr_hdw_name.attr.mode = S_IRUGO;
 sfp->attr_hdw_name.show = hdw_name_show;
 sfp->attr_hdw_name.store = NULL;
 ret = device_create_file(sfp->class_dev,
     &sfp->attr_hdw_name);
 if (ret < 0) {
  pvr2_trace(PVR2_TRACE_ERROR_LEGS,
      "device_create_file error: %d",
      ret);
 } else {
  sfp->hdw_name_created_ok = !0;
 }

 sysfs_attr_init(&sfp->attr_hdw_desc.attr);
 sfp->attr_hdw_desc.attr.name = "device_hardware_description";
 sfp->attr_hdw_desc.attr.mode = S_IRUGO;
 sfp->attr_hdw_desc.show = hdw_desc_show;
 sfp->attr_hdw_desc.store = NULL;
 ret = device_create_file(sfp->class_dev,
     &sfp->attr_hdw_desc);
 if (ret < 0) {
  pvr2_trace(PVR2_TRACE_ERROR_LEGS,
      "device_create_file error: %d",
      ret);
 } else {
  sfp->hdw_desc_created_ok = !0;
 }

 pvr2_sysfs_add_controls(sfp);
#ifdef CONFIG_VIDEO_PVRUSB2_DEBUGIFC
 pvr2_sysfs_add_debugifc(sfp);
#endif /* CONFIG_VIDEO_PVRUSB2_DEBUGIFC */
}


static void pvr2_sysfs_internal_check(struct pvr2_channel *chp)
{
 struct pvr2_sysfs *sfp;
 sfp = container_of(chp,struct pvr2_sysfs,channel);
 if (!sfp->channel.mc_head->disconnect_flag) return;
 pvr2_trace(PVR2_TRACE_STRUCT,"Destroying pvr2_sysfs id=%p",sfp);
 class_dev_destroy(sfp);
 pvr2_channel_done(&sfp->channel);
 kfree(sfp);
}


void pvr2_sysfs_create(struct pvr2_context *mp)
{
 struct pvr2_sysfs *sfp;
 sfp = kzalloc(sizeof(*sfp),GFP_KERNEL);
 if (!sfp)
  return;
 pvr2_trace(PVR2_TRACE_STRUCT,"Creating pvr2_sysfs id=%p",sfp);
 pvr2_channel_init(&sfp->channel,mp);
 sfp->channel.check_func = pvr2_sysfs_internal_check;

 class_dev_create(sfp);
}


void pvr2_sysfs_class_create(void)
{
 if (class_register(&pvr2_class))
  pvr2_sysfs_trace("Registration failed for pvr2_sysfs_class");
}


void pvr2_sysfs_class_destroy(void)
{
 class_unregister(&pvr2_class);
}


#ifdef CONFIG_VIDEO_PVRUSB2_DEBUGIFC
static ssize_t debuginfo_show(struct device *class_dev,
         struct device_attribute *attr, char *buf)
{
 struct pvr2_sysfs *sfp;
 sfp = dev_get_drvdata(class_dev);
 if (!sfp) return -EINVAL;
 pvr2_hdw_trigger_module_log(sfp->channel.hdw);
 return pvr2_debugifc_print_info(sfp->channel.hdw,buf,PAGE_SIZE);
}


static ssize_t debugcmd_show(struct device *class_dev,
        struct device_attribute *attr, char *buf)
{
 struct pvr2_sysfs *sfp;
 sfp = dev_get_drvdata(class_dev);
 if (!sfp) return -EINVAL;
 return pvr2_debugifc_print_status(sfp->channel.hdw,buf,PAGE_SIZE);
}


static ssize_t debugcmd_store(struct device *class_dev,
         struct device_attribute *attr,
         const char *buf, size_t count)
{
 struct pvr2_sysfs *sfp;
 int ret;

 sfp = dev_get_drvdata(class_dev);
 if (!sfp) return -EINVAL;

 ret = pvr2_debugifc_docmd(sfp->channel.hdw,buf,count);
 if (ret < 0) return ret;
 return count;
}
#endif /* CONFIG_VIDEO_PVRUSB2_DEBUGIFC */