/*
 *
 *
 *  Copyright (C) 2005 Mike Isely <isely@pobox.com>
 *
 *  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
 *
 *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#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];
};

struct pvr2_sysfs_class {
        struct class class;
};

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 scnprintf(buf, PAGE_SIZE, "%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);
        if (!name) return -EINVAL;
        return scnprintf(buf, PAGE_SIZE, "%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 scnprintf(buf, PAGE_SIZE, "%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 scnprintf(buf, PAGE_SIZE, "%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_class_release(struct class *class)
{
        struct pvr2_sysfs_class *clp;
        clp = container_of(class,struct pvr2_sysfs_class,class);
        pvr2_sysfs_trace("Destroying pvr2_sysfs_class id=%p",clp);
        kfree(clp);
}


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


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 scnprintf(buf,PAGE_SIZE,"%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 scnprintf(buf,PAGE_SIZE,"%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 scnprintf(buf,PAGE_SIZE,"%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 scnprintf(buf,PAGE_SIZE,"%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 scnprintf(buf,PAGE_SIZE,"%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 scnprintf(buf,PAGE_SIZE,"%d\n",
                         pvr2_hdw_get_unit_number(sfp->channel.hdw));
}


static void class_dev_create(struct pvr2_sysfs *sfp,
                             struct pvr2_sysfs_class *class_ptr)
{
        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 = &class_ptr->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);
}


struct pvr2_sysfs *pvr2_sysfs_create(struct pvr2_context *mp,
                                     struct pvr2_sysfs_class *class_ptr)
{
        struct pvr2_sysfs *sfp;
        sfp = kzalloc(sizeof(*sfp),GFP_KERNEL);
        if (!sfp) return sfp;
        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,class_ptr);
        return sfp;
}



struct pvr2_sysfs_class *pvr2_sysfs_class_create(void)
{
        struct pvr2_sysfs_class *clp;
        clp = kzalloc(sizeof(*clp),GFP_KERNEL);
        if (!clp) return clp;
        pvr2_sysfs_trace("Creating and registering pvr2_sysfs_class id=%p",
                         clp);
        clp->class.name = "pvrusb2";
        clp->class.class_release = pvr2_sysfs_class_release;
        clp->class.dev_release = pvr2_sysfs_release;
        if (class_register(&clp->class)) {
                pvr2_sysfs_trace(
                        "Registration failed for pvr2_sysfs_class id=%p",clp);
                kfree(clp);
                clp = NULL;
        }
        return clp;
}


void pvr2_sysfs_class_destroy(struct pvr2_sysfs_class *clp)
{
        pvr2_sysfs_trace("Unregistering pvr2_sysfs_class id=%p", clp);
        class_unregister(&clp->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 */


/*
  Stuff for Emacs to see, in order to encourage consistent editing style:
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  */