// SPDX-License-Identifier: GPL-2.0-only
/******************************************************************************

    AudioScience HPI driver
    Copyright (C) 1997-2014  AudioScience Inc. <support@audioscience.com>


\file hpicmn.c

 Common functions used by hpixxxx.c modules

(C) Copyright AudioScience Inc. 1998-2003
*******************************************************************************/
#define SOURCEFILE_NAME "hpicmn.c"

#include "hpi_internal.h"
#include "hpidebug.h"
#include "hpimsginit.h"

#include "hpicmn.h"

struct hpi_adapters_list {
        struct hpios_spinlock list_lock;
        struct hpi_adapter_obj adapter[HPI_MAX_ADAPTERS];
        u16 gw_num_adapters;
};

static struct hpi_adapters_list adapters;

/**
 * hpi_validate_response - Given an HPI Message that was sent out and
 * a response that was received, validate that the response has the
 * correct fields filled in, i.e ObjectType, Function etc
 * @phm: message
 * @phr: response
 */
u16 hpi_validate_response(struct hpi_message *phm, struct hpi_response *phr)
{
        if (phr->type != HPI_TYPE_RESPONSE) {
                HPI_DEBUG_LOG(ERROR, "header type %d invalid\n", phr->type);
                return HPI_ERROR_INVALID_RESPONSE;
        }

        if (phr->object != phm->object) {
                HPI_DEBUG_LOG(ERROR, "header object %d invalid\n",
                        phr->object);
                return HPI_ERROR_INVALID_RESPONSE;
        }

        if (phr->function != phm->function) {
                HPI_DEBUG_LOG(ERROR, "header function %d invalid\n",
                        phr->function);
                return HPI_ERROR_INVALID_RESPONSE;
        }

        return 0;
}

u16 hpi_add_adapter(struct hpi_adapter_obj *pao)
{
        u16 retval = 0;
        /*HPI_ASSERT(pao->type); */

        hpios_alistlock_lock(&adapters);

        if (pao->index >= HPI_MAX_ADAPTERS) {
                retval = HPI_ERROR_BAD_ADAPTER_NUMBER;
                goto unlock;
        }

        if (adapters.adapter[pao->index].type) {
                int a;
                for (a = HPI_MAX_ADAPTERS - 1; a >= 0; a--) {
                        if (!adapters.adapter[a].type) {
                                HPI_DEBUG_LOG(WARNING,
                                        "ASI%X duplicate index %d moved to %d\n",
                                        pao->type, pao->index, a);
                                pao->index = a;
                                break;
                        }
                }
                if (a < 0) {
                        retval = HPI_ERROR_DUPLICATE_ADAPTER_NUMBER;
                        goto unlock;
                }
        }
        adapters.adapter[pao->index] = *pao;
        hpios_dsplock_init(&adapters.adapter[pao->index]);
        adapters.gw_num_adapters++;

unlock:
        hpios_alistlock_unlock(&adapters);
        return retval;
}

void hpi_delete_adapter(struct hpi_adapter_obj *pao)
{
        if (!pao->type) {
                HPI_DEBUG_LOG(ERROR, "removing null adapter?\n");
                return;
        }

        hpios_alistlock_lock(&adapters);
        if (adapters.adapter[pao->index].type)
                adapters.gw_num_adapters--;
        memset(&adapters.adapter[pao->index], 0, sizeof(adapters.adapter[0]));
        hpios_alistlock_unlock(&adapters);
}

/**
 * hpi_find_adapter - FindAdapter returns a pointer to the struct
 * hpi_adapter_obj with index wAdapterIndex in an HPI_ADAPTERS_LIST
 * structure.
 * @adapter_index: value in [0, HPI_MAX_ADAPTERS[
 */
struct hpi_adapter_obj *hpi_find_adapter(u16 adapter_index)
{
        struct hpi_adapter_obj *pao = NULL;

        if (adapter_index >= HPI_MAX_ADAPTERS) {
                HPI_DEBUG_LOG(VERBOSE, "find_adapter invalid index %d\n",
                        adapter_index);
                return NULL;
        }

        pao = &adapters.adapter[adapter_index];
        if (pao->type != 0) {
                /*
                   HPI_DEBUG_LOG(VERBOSE, "Found adapter index %d\n",
                   wAdapterIndex);
                 */
                return pao;
        } else {
                /*
                   HPI_DEBUG_LOG(VERBOSE, "No adapter index %d\n",
                   wAdapterIndex);
                 */
                return NULL;
        }
}

/**
 * wipe_adapter_list - wipe an HPI_ADAPTERS_LIST structure.
 *
 */
static void wipe_adapter_list(void)
{
        memset(&adapters, 0, sizeof(adapters));
}

static void subsys_get_adapter(struct hpi_message *phm,
        struct hpi_response *phr)
{
        int count = phm->obj_index;
        u16 index = 0;

        /* find the nCount'th nonzero adapter in array */
        for (index = 0; index < HPI_MAX_ADAPTERS; index++) {
                if (adapters.adapter[index].type) {
                        if (!count)
                                break;
                        count--;
                }
        }

        if (index < HPI_MAX_ADAPTERS) {
                phr->u.s.adapter_index = adapters.adapter[index].index;
                phr->u.s.adapter_type = adapters.adapter[index].type;
        } else {
                phr->u.s.adapter_index = 0;
                phr->u.s.adapter_type = 0;
                phr->error = HPI_ERROR_INVALID_OBJ_INDEX;
        }
}

static unsigned int control_cache_alloc_check(struct hpi_control_cache *pC)
{
        unsigned int i;
        int cached = 0;
        if (!pC)
                return 0;

        if (pC->init)
                return pC->init;

        if (!pC->p_cache)
                return 0;

        if (pC->control_count && pC->cache_size_in_bytes) {
                char *p_master_cache;
                unsigned int byte_count = 0;

                p_master_cache = (char *)pC->p_cache;
                HPI_DEBUG_LOG(DEBUG, "check %d controls\n",
                        pC->control_count);
                for (i = 0; i < pC->control_count; i++) {
                        struct hpi_control_cache_info *info =
                                (struct hpi_control_cache_info *)
                                &p_master_cache[byte_count];
                        u16 control_index = info->control_index;

                        if (control_index >= pC->control_count) {
                                HPI_DEBUG_LOG(INFO,
                                        "adap %d control index %d out of range, cache not ready?\n",
                                        pC->adap_idx, control_index);
                                return 0;
                        }

                        if (!info->size_in32bit_words) {
                                if (!i) {
                                        HPI_DEBUG_LOG(INFO,
                                                "adap %d cache not ready?\n",
                                                pC->adap_idx);
                                        return 0;
                                }
                                /* The cache is invalid.
                                 * Minimum valid entry size is
                                 * sizeof(struct hpi_control_cache_info)
                                 */
                                HPI_DEBUG_LOG(ERROR,
                                        "adap %d zero size cache entry %d\n",
                                        pC->adap_idx, i);
                                break;
                        }

                        if (info->control_type) {
                                pC->p_info[control_index] = info;
                                cached++;
                        } else {        /* dummy cache entry */
                                pC->p_info[control_index] = NULL;
                        }

                        byte_count += info->size_in32bit_words * 4;

                        HPI_DEBUG_LOG(VERBOSE,
                                "cached %d, pinfo %p index %d type %d size %d\n",
                                cached, pC->p_info[info->control_index],
                                info->control_index, info->control_type,
                                info->size_in32bit_words);

                        /* quit loop early if whole cache has been scanned.
                         * dwControlCount is the maximum possible entries
                         * but some may be absent from the cache
                         */
                        if (byte_count >= pC->cache_size_in_bytes)
                                break;
                        /* have seen last control index */
                        if (info->control_index == pC->control_count - 1)
                                break;
                }

                if (byte_count != pC->cache_size_in_bytes)
                        HPI_DEBUG_LOG(WARNING,
                                "adap %d bytecount %d != cache size %d\n",
                                pC->adap_idx, byte_count,
                                pC->cache_size_in_bytes);
                else
                        HPI_DEBUG_LOG(DEBUG,
                                "adap %d cache good, bytecount == cache size = %d\n",
                                pC->adap_idx, byte_count);

                pC->init = (u16)cached;
        }
        return pC->init;
}

/** Find a control.
*/
static short find_control(u16 control_index,
        struct hpi_control_cache *p_cache, struct hpi_control_cache_info **pI)
{
        if (!control_cache_alloc_check(p_cache)) {
                HPI_DEBUG_LOG(VERBOSE,
                        "control_cache_alloc_check() failed %d\n",
                        control_index);
                return 0;
        }

        *pI = p_cache->p_info[control_index];
        if (!*pI) {
                HPI_DEBUG_LOG(VERBOSE, "Uncached Control %d\n",
                        control_index);
                return 0;
        } else {
                HPI_DEBUG_LOG(VERBOSE, "find_control() type %d\n",
                        (*pI)->control_type);
        }
        return 1;
}

/* allow unified treatment of several string fields within struct */
#define HPICMN_PAD_OFS_AND_SIZE(m)  {\
        offsetof(struct hpi_control_cache_pad, m), \
        sizeof(((struct hpi_control_cache_pad *)(NULL))->m) }

struct pad_ofs_size {
        unsigned int offset;
        unsigned int field_size;
};

static const struct pad_ofs_size pad_desc[] = {
        HPICMN_PAD_OFS_AND_SIZE(c_channel),     /* HPI_PAD_CHANNEL_NAME */
        HPICMN_PAD_OFS_AND_SIZE(c_artist),      /* HPI_PAD_ARTIST */
        HPICMN_PAD_OFS_AND_SIZE(c_title),       /* HPI_PAD_TITLE */
        HPICMN_PAD_OFS_AND_SIZE(c_comment),     /* HPI_PAD_COMMENT */
};

/** CheckControlCache checks the cache and fills the struct hpi_response
 * accordingly. It returns one if a cache hit occurred, zero otherwise.
 */
short hpi_check_control_cache_single(struct hpi_control_cache_single *pC,
        struct hpi_message *phm, struct hpi_response *phr)
{
        size_t response_size;
        short found = 1;

        /* set the default response size */
        response_size =
                sizeof(struct hpi_response_header) +
                sizeof(struct hpi_control_res);

        switch (pC->u.i.control_type) {

        case HPI_CONTROL_METER:
                if (phm->u.c.attribute == HPI_METER_PEAK) {
                        phr->u.c.an_log_value[0] = pC->u.meter.an_log_peak[0];
                        phr->u.c.an_log_value[1] = pC->u.meter.an_log_peak[1];
                } else if (phm->u.c.attribute == HPI_METER_RMS) {
                        if (pC->u.meter.an_logRMS[0] ==
                                HPI_CACHE_INVALID_SHORT) {
                                phr->error =
                                        HPI_ERROR_INVALID_CONTROL_ATTRIBUTE;
                                phr->u.c.an_log_value[0] = HPI_METER_MINIMUM;
                                phr->u.c.an_log_value[1] = HPI_METER_MINIMUM;
                        } else {
                                phr->u.c.an_log_value[0] =
                                        pC->u.meter.an_logRMS[0];
                                phr->u.c.an_log_value[1] =
                                        pC->u.meter.an_logRMS[1];
                        }
                } else
                        found = 0;
                break;
        case HPI_CONTROL_VOLUME:
                if (phm->u.c.attribute == HPI_VOLUME_GAIN) {
                        phr->u.c.an_log_value[0] = pC->u.vol.an_log[0];
                        phr->u.c.an_log_value[1] = pC->u.vol.an_log[1];
                } else if (phm->u.c.attribute == HPI_VOLUME_MUTE) {
                        if (pC->u.vol.flags & HPI_VOLUME_FLAG_HAS_MUTE) {
                                if (pC->u.vol.flags & HPI_VOLUME_FLAG_MUTED)
                                        phr->u.c.param1 =
                                                HPI_BITMASK_ALL_CHANNELS;
                                else
                                        phr->u.c.param1 = 0;
                        } else {
                                phr->error =
                                        HPI_ERROR_INVALID_CONTROL_ATTRIBUTE;
                                phr->u.c.param1 = 0;
                        }
                } else {
                        found = 0;
                }
                break;
        case HPI_CONTROL_MULTIPLEXER:
                if (phm->u.c.attribute == HPI_MULTIPLEXER_SOURCE) {
                        phr->u.c.param1 = pC->u.mux.source_node_type;
                        phr->u.c.param2 = pC->u.mux.source_node_index;
                } else {
                        found = 0;
                }
                break;
        case HPI_CONTROL_CHANNEL_MODE:
                if (phm->u.c.attribute == HPI_CHANNEL_MODE_MODE)
                        phr->u.c.param1 = pC->u.mode.mode;
                else
                        found = 0;
                break;
        case HPI_CONTROL_LEVEL:
                if (phm->u.c.attribute == HPI_LEVEL_GAIN) {
                        phr->u.c.an_log_value[0] = pC->u.level.an_log[0];
                        phr->u.c.an_log_value[1] = pC->u.level.an_log[1];
                } else
                        found = 0;
                break;
        case HPI_CONTROL_TUNER:
                if (phm->u.c.attribute == HPI_TUNER_FREQ)
                        phr->u.c.param1 = pC->u.tuner.freq_ink_hz;
                else if (phm->u.c.attribute == HPI_TUNER_BAND)
                        phr->u.c.param1 = pC->u.tuner.band;
                else if (phm->u.c.attribute == HPI_TUNER_LEVEL_AVG)
                        if (pC->u.tuner.s_level_avg ==
                                HPI_CACHE_INVALID_SHORT) {
                                phr->u.cu.tuner.s_level = 0;
                                phr->error =
                                        HPI_ERROR_INVALID_CONTROL_ATTRIBUTE;
                        } else
                                phr->u.cu.tuner.s_level =
                                        pC->u.tuner.s_level_avg;
                else
                        found = 0;
                break;
        case HPI_CONTROL_AESEBU_RECEIVER:
                if (phm->u.c.attribute == HPI_AESEBURX_ERRORSTATUS)
                        phr->u.c.param1 = pC->u.aes3rx.error_status;
                else if (phm->u.c.attribute == HPI_AESEBURX_FORMAT)
                        phr->u.c.param1 = pC->u.aes3rx.format;
                else
                        found = 0;
                break;
        case HPI_CONTROL_AESEBU_TRANSMITTER:
                if (phm->u.c.attribute == HPI_AESEBUTX_FORMAT)
                        phr->u.c.param1 = pC->u.aes3tx.format;
                else
                        found = 0;
                break;
        case HPI_CONTROL_TONEDETECTOR:
                if (phm->u.c.attribute == HPI_TONEDETECTOR_STATE)
                        phr->u.c.param1 = pC->u.tone.state;
                else
                        found = 0;
                break;
        case HPI_CONTROL_SILENCEDETECTOR:
                if (phm->u.c.attribute == HPI_SILENCEDETECTOR_STATE) {
                        phr->u.c.param1 = pC->u.silence.state;
                } else
                        found = 0;
                break;
        case HPI_CONTROL_MICROPHONE:
                if (phm->u.c.attribute == HPI_MICROPHONE_PHANTOM_POWER)
                        phr->u.c.param1 = pC->u.microphone.phantom_state;
                else
                        found = 0;
                break;
        case HPI_CONTROL_SAMPLECLOCK:
                if (phm->u.c.attribute == HPI_SAMPLECLOCK_SOURCE)
                        phr->u.c.param1 = pC->u.clk.source;
                else if (phm->u.c.attribute == HPI_SAMPLECLOCK_SOURCE_INDEX) {
                        if (pC->u.clk.source_index ==
                                HPI_CACHE_INVALID_UINT16) {
                                phr->u.c.param1 = 0;
                                phr->error =
                                        HPI_ERROR_INVALID_CONTROL_ATTRIBUTE;
                        } else
                                phr->u.c.param1 = pC->u.clk.source_index;
                } else if (phm->u.c.attribute == HPI_SAMPLECLOCK_SAMPLERATE)
                        phr->u.c.param1 = pC->u.clk.sample_rate;
                else
                        found = 0;
                break;
        case HPI_CONTROL_PAD:{
                        struct hpi_control_cache_pad *p_pad;
                        p_pad = (struct hpi_control_cache_pad *)pC;

                        if (!(p_pad->field_valid_flags & (1 <<
                                                HPI_CTL_ATTR_INDEX(phm->u.c.
                                                        attribute)))) {
                                phr->error =
                                        HPI_ERROR_INVALID_CONTROL_ATTRIBUTE;
                                break;
                        }

                        if (phm->u.c.attribute == HPI_PAD_PROGRAM_ID)
                                phr->u.c.param1 = p_pad->pI;
                        else if (phm->u.c.attribute == HPI_PAD_PROGRAM_TYPE)
                                phr->u.c.param1 = p_pad->pTY;
                        else {
                                unsigned int index =
                                        HPI_CTL_ATTR_INDEX(phm->u.c.
                                        attribute) - 1;
                                unsigned int offset = phm->u.c.param1;
                                unsigned int pad_string_len, field_size;
                                char *pad_string;
                                unsigned int tocopy;

                                if (index > ARRAY_SIZE(pad_desc) - 1) {
                                        phr->error =
                                                HPI_ERROR_INVALID_CONTROL_ATTRIBUTE;
                                        break;
                                }

                                pad_string =
                                        ((char *)p_pad) +
                                        pad_desc[index].offset;
                                field_size = pad_desc[index].field_size;
                                /* Ensure null terminator */
                                pad_string[field_size - 1] = 0;

                                pad_string_len = strlen(pad_string) + 1;

                                if (offset > pad_string_len) {
                                        phr->error =
                                                HPI_ERROR_INVALID_CONTROL_VALUE;
                                        break;
                                }

                                tocopy = pad_string_len - offset;
                                if (tocopy > sizeof(phr->u.cu.chars8.sz_data))
                                        tocopy = sizeof(phr->u.cu.chars8.
                                                sz_data);

                                memcpy(phr->u.cu.chars8.sz_data,
                                        &pad_string[offset], tocopy);

                                phr->u.cu.chars8.remaining_chars =
                                        pad_string_len - offset - tocopy;
                        }
                }
                break;
        default:
                found = 0;
                break;
        }

        HPI_DEBUG_LOG(VERBOSE, "%s Adap %d, Ctl %d, Type %d, Attr %d\n",
                found ? "Cached" : "Uncached", phm->adapter_index,
                pC->u.i.control_index, pC->u.i.control_type,
                phm->u.c.attribute);

        if (found) {
                phr->size = (u16)response_size;
                phr->type = HPI_TYPE_RESPONSE;
                phr->object = phm->object;
                phr->function = phm->function;
        }

        return found;
}

short hpi_check_control_cache(struct hpi_control_cache *p_cache,
        struct hpi_message *phm, struct hpi_response *phr)
{
        struct hpi_control_cache_info *pI;

        if (!find_control(phm->obj_index, p_cache, &pI)) {
                HPI_DEBUG_LOG(VERBOSE,
                        "HPICMN find_control() failed for adap %d\n",
                        phm->adapter_index);
                return 0;
        }

        phr->error = 0;
        phr->specific_error = 0;
        phr->version = 0;

        return hpi_check_control_cache_single((struct hpi_control_cache_single
                        *)pI, phm, phr);
}

/** Updates the cache with Set values.

Only update if no error.
Volume and Level return the limited values in the response, so use these
Multiplexer does so use sent values
*/
void hpi_cmn_control_cache_sync_to_msg_single(struct hpi_control_cache_single
        *pC, struct hpi_message *phm, struct hpi_response *phr)
{
        switch (pC->u.i.control_type) {
        case HPI_CONTROL_VOLUME:
                if (phm->u.c.attribute == HPI_VOLUME_GAIN) {
                        pC->u.vol.an_log[0] = phr->u.c.an_log_value[0];
                        pC->u.vol.an_log[1] = phr->u.c.an_log_value[1];
                } else if (phm->u.c.attribute == HPI_VOLUME_MUTE) {
                        if (phm->u.c.param1)
                                pC->u.vol.flags |= HPI_VOLUME_FLAG_MUTED;
                        else
                                pC->u.vol.flags &= ~HPI_VOLUME_FLAG_MUTED;
                }
                break;
        case HPI_CONTROL_MULTIPLEXER:
                /* mux does not return its setting on Set command. */
                if (phm->u.c.attribute == HPI_MULTIPLEXER_SOURCE) {
                        pC->u.mux.source_node_type = (u16)phm->u.c.param1;
                        pC->u.mux.source_node_index = (u16)phm->u.c.param2;
                }
                break;
        case HPI_CONTROL_CHANNEL_MODE:
                /* mode does not return its setting on Set command. */
                if (phm->u.c.attribute == HPI_CHANNEL_MODE_MODE)
                        pC->u.mode.mode = (u16)phm->u.c.param1;
                break;
        case HPI_CONTROL_LEVEL:
                if (phm->u.c.attribute == HPI_LEVEL_GAIN) {
                        pC->u.vol.an_log[0] = phr->u.c.an_log_value[0];
                        pC->u.vol.an_log[1] = phr->u.c.an_log_value[1];
                }
                break;
        case HPI_CONTROL_MICROPHONE:
                if (phm->u.c.attribute == HPI_MICROPHONE_PHANTOM_POWER)
                        pC->u.microphone.phantom_state = (u16)phm->u.c.param1;
                break;
        case HPI_CONTROL_AESEBU_TRANSMITTER:
                if (phm->u.c.attribute == HPI_AESEBUTX_FORMAT)
                        pC->u.aes3tx.format = phm->u.c.param1;
                break;
        case HPI_CONTROL_AESEBU_RECEIVER:
                if (phm->u.c.attribute == HPI_AESEBURX_FORMAT)
                        pC->u.aes3rx.format = phm->u.c.param1;
                break;
        case HPI_CONTROL_SAMPLECLOCK:
                if (phm->u.c.attribute == HPI_SAMPLECLOCK_SOURCE)
                        pC->u.clk.source = (u16)phm->u.c.param1;
                else if (phm->u.c.attribute == HPI_SAMPLECLOCK_SOURCE_INDEX)
                        pC->u.clk.source_index = (u16)phm->u.c.param1;
                else if (phm->u.c.attribute == HPI_SAMPLECLOCK_SAMPLERATE)
                        pC->u.clk.sample_rate = phm->u.c.param1;
                break;
        default:
                break;
        }
}

void hpi_cmn_control_cache_sync_to_msg(struct hpi_control_cache *p_cache,
        struct hpi_message *phm, struct hpi_response *phr)
{
        struct hpi_control_cache_single *pC;
        struct hpi_control_cache_info *pI;

        if (phr->error)
                return;

        if (!find_control(phm->obj_index, p_cache, &pI)) {
                HPI_DEBUG_LOG(VERBOSE,
                        "HPICMN find_control() failed for adap %d\n",
                        phm->adapter_index);
                return;
        }

        /* pC is the default cached control strucure.
           May be cast to something else in the following switch statement.
         */
        pC = (struct hpi_control_cache_single *)pI;

        hpi_cmn_control_cache_sync_to_msg_single(pC, phm, phr);
}

/** Allocate control cache.

\return Cache pointer, or NULL if allocation fails.
*/
struct hpi_control_cache *hpi_alloc_control_cache(const u32 control_count,
        const u32 size_in_bytes, u8 *p_dsp_control_buffer)
{
        struct hpi_control_cache *p_cache = kmalloc_obj(*p_cache);
        if (!p_cache)
                return NULL;

        p_cache->p_info =
                kzalloc_objs(*p_cache->p_info, control_count);
        if (!p_cache->p_info) {
                kfree(p_cache);
                return NULL;
        }

        p_cache->cache_size_in_bytes = size_in_bytes;
        p_cache->control_count = control_count;
        p_cache->p_cache = p_dsp_control_buffer;
        p_cache->init = 0;
        return p_cache;
}

void hpi_free_control_cache(struct hpi_control_cache *p_cache)
{
        if (p_cache) {
                kfree(p_cache->p_info);
                kfree(p_cache);
        }
}

static void subsys_message(struct hpi_message *phm, struct hpi_response *phr)
{
        hpi_init_response(phr, HPI_OBJ_SUBSYSTEM, phm->function, 0);

        switch (phm->function) {
        case HPI_SUBSYS_OPEN:
        case HPI_SUBSYS_CLOSE:
        case HPI_SUBSYS_DRIVER_UNLOAD:
                break;
        case HPI_SUBSYS_DRIVER_LOAD:
                wipe_adapter_list();
                hpios_alistlock_init(&adapters);
                break;
        case HPI_SUBSYS_GET_ADAPTER:
                subsys_get_adapter(phm, phr);
                break;
        case HPI_SUBSYS_GET_NUM_ADAPTERS:
                phr->u.s.num_adapters = adapters.gw_num_adapters;
                break;
        case HPI_SUBSYS_CREATE_ADAPTER:
                break;
        default:
                phr->error = HPI_ERROR_INVALID_FUNC;
                break;
        }
}

void HPI_COMMON(struct hpi_message *phm, struct hpi_response *phr)
{
        switch (phm->type) {
        case HPI_TYPE_REQUEST:
                switch (phm->object) {
                case HPI_OBJ_SUBSYSTEM:
                        subsys_message(phm, phr);
                        break;
                }
                break;

        default:
                phr->error = HPI_ERROR_INVALID_TYPE;
                break;
        }
}