ctsrc.c

Go to the documentation of this file.

#include "ctsrc.h"
#include "cthardware.h"
#include <linux/slab.h>

#define SRC_RESOURCE_NUM    256
#define SRCIMP_RESOURCE_NUM 256

static unsigned int conj_mask;

static int src_default_config_memrd(struct src *src);
static int src_default_config_memwr(struct src *src);
static int src_default_config_arcrw(struct src *src);

static int (*src_default_config[3])(struct src *) = {
    [MEMRD] = src_default_config_memrd,
    [MEMWR] = src_default_config_memwr,
    [ARCRW] = src_default_config_arcrw
};

static int src_set_state(struct src *src, unsigned int state)
{
    struct hw *hw;

    hw = src->rsc.hw;
    hw->src_set_state(src->rsc.ctrl_blk, state);

    return 0;
}

static int src_set_bm(struct src *src, unsigned int bm)
{
    struct hw *hw;

    hw = src->rsc.hw;
    hw->src_set_bm(src->rsc.ctrl_blk, bm);

    return 0;
}

static int src_set_sf(struct src *src, unsigned int sf)
{
    struct hw *hw;

    hw = src->rsc.hw;
    hw->src_set_sf(src->rsc.ctrl_blk, sf);

    return 0;
}

static int src_set_pm(struct src *src, unsigned int pm)
{
    struct hw *hw;

    hw = src->rsc.hw;
    hw->src_set_pm(src->rsc.ctrl_blk, pm);

    return 0;
}

static int src_set_rom(struct src *src, unsigned int rom)
{
    struct hw *hw;

    hw = src->rsc.hw;
    hw->src_set_rom(src->rsc.ctrl_blk, rom);

    return 0;
}

static int src_set_vo(struct src *src, unsigned int vo)
{
    struct hw *hw;

    hw = src->rsc.hw;
    hw->src_set_vo(src->rsc.ctrl_blk, vo);

    return 0;
}

static int src_set_st(struct src *src, unsigned int st)
{
    struct hw *hw;

    hw = src->rsc.hw;
    hw->src_set_st(src->rsc.ctrl_blk, st);

    return 0;
}

static int src_set_bp(struct src *src, unsigned int bp)
{
    struct hw *hw;

    hw = src->rsc.hw;
    hw->src_set_bp(src->rsc.ctrl_blk, bp);

    return 0;
}

static int src_set_cisz(struct src *src, unsigned int cisz)
{
    struct hw *hw;

    hw = src->rsc.hw;
    hw->src_set_cisz(src->rsc.ctrl_blk, cisz);

    return 0;
}

static int src_set_ca(struct src *src, unsigned int ca)
{
    struct hw *hw;

    hw = src->rsc.hw;
    hw->src_set_ca(src->rsc.ctrl_blk, ca);

    return 0;
}

static int src_set_sa(struct src *src, unsigned int sa)
{
    struct hw *hw;

    hw = src->rsc.hw;
    hw->src_set_sa(src->rsc.ctrl_blk, sa);

    return 0;
}

static int src_set_la(struct src *src, unsigned int la)
{
    struct hw *hw;

    hw = src->rsc.hw;
    hw->src_set_la(src->rsc.ctrl_blk, la);

    return 0;
}

static int src_set_pitch(struct src *src, unsigned int pitch)
{
    struct hw *hw;

    hw = src->rsc.hw;
    hw->src_set_pitch(src->rsc.ctrl_blk, pitch);

    return 0;
}

static int src_set_clear_zbufs(struct src *src)
{
    struct hw *hw;

    hw = src->rsc.hw;
    hw->src_set_clear_zbufs(src->rsc.ctrl_blk, 1);

    return 0;
}

static int src_commit_write(struct src *src)
{
    struct hw *hw;
    int i;
    unsigned int dirty = 0;

    hw = src->rsc.hw;
    src->rsc.ops->master(&src->rsc);
    if (src->rsc.msr > 1) {
        /* Save dirty flags for conjugate resource programming */
        dirty = hw->src_get_dirty(src->rsc.ctrl_blk) & conj_mask;
    }
    hw->src_commit_write(hw, src->rsc.ops->index(&src->rsc),
                        src->rsc.ctrl_blk);

    /* Program conjugate parameter mixer resources */
    if (MEMWR == src->mode)
        return 0;

    for (i = 1; i < src->rsc.msr; i++) {
        src->rsc.ops->next_conj(&src->rsc);
        hw->src_set_dirty(src->rsc.ctrl_blk, dirty);
        hw->src_commit_write(hw, src->rsc.ops->index(&src->rsc),
                            src->rsc.ctrl_blk);
    }
    src->rsc.ops->master(&src->rsc);

    return 0;
}

static int src_get_ca(struct src *src)
{
    struct hw *hw;

    hw = src->rsc.hw;
    return hw->src_get_ca(hw, src->rsc.ops->index(&src->rsc),
                        src->rsc.ctrl_blk);
}

static int src_init(struct src *src)
{
    src_default_config[src->mode](src);

    return 0;
}

static struct src *src_next_interleave(struct src *src)
{
    return src->intlv;
}

static int src_default_config_memrd(struct src *src)
{
    struct hw *hw = src->rsc.hw;
    unsigned int rsr, msr;

    hw->src_set_state(src->rsc.ctrl_blk, SRC_STATE_OFF);
    hw->src_set_bm(src->rsc.ctrl_blk, 1);
    for (rsr = 0, msr = src->rsc.msr; msr > 1; msr >>= 1)
        rsr++;

    hw->src_set_rsr(src->rsc.ctrl_blk, rsr);
    hw->src_set_sf(src->rsc.ctrl_blk, SRC_SF_S16);
    hw->src_set_wr(src->rsc.ctrl_blk, 0);
    hw->src_set_pm(src->rsc.ctrl_blk, 0);
    hw->src_set_rom(src->rsc.ctrl_blk, 0);
    hw->src_set_vo(src->rsc.ctrl_blk, 0);
    hw->src_set_st(src->rsc.ctrl_blk, 0);
    hw->src_set_ilsz(src->rsc.ctrl_blk, src->multi - 1);
    hw->src_set_cisz(src->rsc.ctrl_blk, 0x80);
    hw->src_set_sa(src->rsc.ctrl_blk, 0x0);
    hw->src_set_la(src->rsc.ctrl_blk, 0x1000);
    hw->src_set_ca(src->rsc.ctrl_blk, 0x80);
    hw->src_set_pitch(src->rsc.ctrl_blk, 0x1000000);
    hw->src_set_clear_zbufs(src->rsc.ctrl_blk, 1);

    src->rsc.ops->master(&src->rsc);
    hw->src_commit_write(hw, src->rsc.ops->index(&src->rsc),
                        src->rsc.ctrl_blk);

    for (msr = 1; msr < src->rsc.msr; msr++) {
        src->rsc.ops->next_conj(&src->rsc);
        hw->src_set_pitch(src->rsc.ctrl_blk, 0x1000000);
        hw->src_commit_write(hw, src->rsc.ops->index(&src->rsc),
                            src->rsc.ctrl_blk);
    }
    src->rsc.ops->master(&src->rsc);

    return 0;
}

static int src_default_config_memwr(struct src *src)
{
    struct hw *hw = src->rsc.hw;

    hw->src_set_state(src->rsc.ctrl_blk, SRC_STATE_OFF);
    hw->src_set_bm(src->rsc.ctrl_blk, 1);
    hw->src_set_rsr(src->rsc.ctrl_blk, 0);
    hw->src_set_sf(src->rsc.ctrl_blk, SRC_SF_S16);
    hw->src_set_wr(src->rsc.ctrl_blk, 1);
    hw->src_set_pm(src->rsc.ctrl_blk, 0);
    hw->src_set_rom(src->rsc.ctrl_blk, 0);
    hw->src_set_vo(src->rsc.ctrl_blk, 0);
    hw->src_set_st(src->rsc.ctrl_blk, 0);
    hw->src_set_ilsz(src->rsc.ctrl_blk, 0);
    hw->src_set_cisz(src->rsc.ctrl_blk, 0x80);
    hw->src_set_sa(src->rsc.ctrl_blk, 0x0);
    hw->src_set_la(src->rsc.ctrl_blk, 0x1000);
    hw->src_set_ca(src->rsc.ctrl_blk, 0x80);
    hw->src_set_pitch(src->rsc.ctrl_blk, 0x1000000);
    hw->src_set_clear_zbufs(src->rsc.ctrl_blk, 1);

    src->rsc.ops->master(&src->rsc);
    hw->src_commit_write(hw, src->rsc.ops->index(&src->rsc),
                        src->rsc.ctrl_blk);

    return 0;
}

static int src_default_config_arcrw(struct src *src)
{
    struct hw *hw = src->rsc.hw;
    unsigned int rsr, msr;
    unsigned int dirty;

    hw->src_set_state(src->rsc.ctrl_blk, SRC_STATE_OFF);
    hw->src_set_bm(src->rsc.ctrl_blk, 0);
    for (rsr = 0, msr = src->rsc.msr; msr > 1; msr >>= 1)
        rsr++;

    hw->src_set_rsr(src->rsc.ctrl_blk, rsr);
    hw->src_set_sf(src->rsc.ctrl_blk, SRC_SF_F32);
    hw->src_set_wr(src->rsc.ctrl_blk, 0);
    hw->src_set_pm(src->rsc.ctrl_blk, 0);
    hw->src_set_rom(src->rsc.ctrl_blk, 0);
    hw->src_set_vo(src->rsc.ctrl_blk, 0);
    hw->src_set_st(src->rsc.ctrl_blk, 0);
    hw->src_set_ilsz(src->rsc.ctrl_blk, 0);
    hw->src_set_cisz(src->rsc.ctrl_blk, 0x80);
    hw->src_set_sa(src->rsc.ctrl_blk, 0x0);
    /*hw->src_set_sa(src->rsc.ctrl_blk, 0x100);*/
    hw->src_set_la(src->rsc.ctrl_blk, 0x1000);
    /*hw->src_set_la(src->rsc.ctrl_blk, 0x03ffffe0);*/
    hw->src_set_ca(src->rsc.ctrl_blk, 0x80);
    hw->src_set_pitch(src->rsc.ctrl_blk, 0x1000000);
    hw->src_set_clear_zbufs(src->rsc.ctrl_blk, 1);

    dirty = hw->src_get_dirty(src->rsc.ctrl_blk);
    src->rsc.ops->master(&src->rsc);
    for (msr = 0; msr < src->rsc.msr; msr++) {
        hw->src_set_dirty(src->rsc.ctrl_blk, dirty);
        hw->src_commit_write(hw, src->rsc.ops->index(&src->rsc),
                            src->rsc.ctrl_blk);
        src->rsc.ops->next_conj(&src->rsc);
    }
    src->rsc.ops->master(&src->rsc);

    return 0;
}

static struct src_rsc_ops src_rsc_ops = {
    .set_state      = src_set_state,
    .set_bm         = src_set_bm,
    .set_sf         = src_set_sf,
    .set_pm         = src_set_pm,
    .set_rom        = src_set_rom,
    .set_vo         = src_set_vo,
    .set_st         = src_set_st,
    .set_bp         = src_set_bp,
    .set_cisz       = src_set_cisz,
    .set_ca         = src_set_ca,
    .set_sa         = src_set_sa,
    .set_la         = src_set_la,
    .set_pitch      = src_set_pitch,
    .set_clr_zbufs      = src_set_clear_zbufs,
    .commit_write       = src_commit_write,
    .get_ca         = src_get_ca,
    .init           = src_init,
    .next_interleave    = src_next_interleave,
};

static int
src_rsc_init(struct src *src, u32 idx,
         const struct src_desc *desc, struct src_mgr *mgr)
{
    int err;
    int i, n;
    struct src *p;

    n = (MEMRD == desc->mode) ? desc->multi : 1;
    for (i = 0, p = src; i < n; i++, p++) {
        err = rsc_init(&p->rsc, idx + i, SRC, desc->msr, mgr->mgr.hw);
        if (err)
            goto error1;

        /* Initialize src specific rsc operations */
        p->ops = &src_rsc_ops;
        p->multi = (0 == i) ? desc->multi : 1;
        p->mode = desc->mode;
        src_default_config[desc->mode](p);
        mgr->src_enable(mgr, p);
        p->intlv = p + 1;
    }
    (--p)->intlv = NULL;    /* Set @intlv of the last SRC to NULL */

    mgr->commit_write(mgr);

    return 0;

error1:
    for (i--, p--; i >= 0; i--, p--) {
        mgr->src_disable(mgr, p);
        rsc_uninit(&p->rsc);
    }
    mgr->commit_write(mgr);
    return err;
}

static int src_rsc_uninit(struct src *src, struct src_mgr *mgr)
{
    int i, n;
    struct src *p;

    n = (MEMRD == src->mode) ? src->multi : 1;
    for (i = 0, p = src; i < n; i++, p++) {
        mgr->src_disable(mgr, p);
        rsc_uninit(&p->rsc);
        p->multi = 0;
        p->ops = NULL;
        p->mode = NUM_SRCMODES;
        p->intlv = NULL;
    }
    mgr->commit_write(mgr);

    return 0;
}

static int
get_src_rsc(struct src_mgr *mgr, const struct src_desc *desc, struct src **rsrc)
{
    unsigned int idx = SRC_RESOURCE_NUM;
    int err;
    struct src *src;
    unsigned long flags;

    *rsrc = NULL;

    /* Check whether there are sufficient src resources to meet request. */
    spin_lock_irqsave(&mgr->mgr_lock, flags);
    if (MEMRD == desc->mode)
        err = mgr_get_resource(&mgr->mgr, desc->multi, &idx);
    else
        err = mgr_get_resource(&mgr->mgr, 1, &idx);

    spin_unlock_irqrestore(&mgr->mgr_lock, flags);
    if (err) {
        printk(KERN_ERR "ctxfi: Can't meet SRC resource request!\n");
        return err;
    }

    /* Allocate mem for master src resource */
    if (MEMRD == desc->mode)
        src = kcalloc(desc->multi, sizeof(*src), GFP_KERNEL);
    else
        src = kzalloc(sizeof(*src), GFP_KERNEL);

    if (!src) {
        err = -ENOMEM;
        goto error1;
    }

    err = src_rsc_init(src, idx, desc, mgr);
    if (err)
        goto error2;

    *rsrc = src;

    return 0;

error2:
    kfree(src);
error1:
    spin_lock_irqsave(&mgr->mgr_lock, flags);
    if (MEMRD == desc->mode)
        mgr_put_resource(&mgr->mgr, desc->multi, idx);
    else
        mgr_put_resource(&mgr->mgr, 1, idx);

    spin_unlock_irqrestore(&mgr->mgr_lock, flags);
    return err;
}

static int put_src_rsc(struct src_mgr *mgr, struct src *src)
{
    unsigned long flags;

    spin_lock_irqsave(&mgr->mgr_lock, flags);
    src->rsc.ops->master(&src->rsc);
    if (MEMRD == src->mode)
        mgr_put_resource(&mgr->mgr, src->multi,
                 src->rsc.ops->index(&src->rsc));
    else
        mgr_put_resource(&mgr->mgr, 1, src->rsc.ops->index(&src->rsc));

    spin_unlock_irqrestore(&mgr->mgr_lock, flags);
    src_rsc_uninit(src, mgr);
    kfree(src);

    return 0;
}

static int src_enable_s(struct src_mgr *mgr, struct src *src)
{
    struct hw *hw = mgr->mgr.hw;
    int i;

    src->rsc.ops->master(&src->rsc);
    for (i = 0; i < src->rsc.msr; i++) {
        hw->src_mgr_enbs_src(mgr->mgr.ctrl_blk,
                     src->rsc.ops->index(&src->rsc));
        src->rsc.ops->next_conj(&src->rsc);
    }
    src->rsc.ops->master(&src->rsc);

    return 0;
}

static int src_enable(struct src_mgr *mgr, struct src *src)
{
    struct hw *hw = mgr->mgr.hw;
    int i;

    src->rsc.ops->master(&src->rsc);
    for (i = 0; i < src->rsc.msr; i++) {
        hw->src_mgr_enb_src(mgr->mgr.ctrl_blk,
                    src->rsc.ops->index(&src->rsc));
        src->rsc.ops->next_conj(&src->rsc);
    }
    src->rsc.ops->master(&src->rsc);

    return 0;
}

static int src_disable(struct src_mgr *mgr, struct src *src)
{
    struct hw *hw = mgr->mgr.hw;
    int i;

    src->rsc.ops->master(&src->rsc);
    for (i = 0; i < src->rsc.msr; i++) {
        hw->src_mgr_dsb_src(mgr->mgr.ctrl_blk,
                    src->rsc.ops->index(&src->rsc));
        src->rsc.ops->next_conj(&src->rsc);
    }
    src->rsc.ops->master(&src->rsc);

    return 0;
}

static int src_mgr_commit_write(struct src_mgr *mgr)
{
    struct hw *hw = mgr->mgr.hw;

    hw->src_mgr_commit_write(hw, mgr->mgr.ctrl_blk);

    return 0;
}

int src_mgr_create(void *hw, struct src_mgr **rsrc_mgr)
{
    int err, i;
    struct src_mgr *src_mgr;

    *rsrc_mgr = NULL;
    src_mgr = kzalloc(sizeof(*src_mgr), GFP_KERNEL);
    if (!src_mgr)
        return -ENOMEM;

    err = rsc_mgr_init(&src_mgr->mgr, SRC, SRC_RESOURCE_NUM, hw);
    if (err)
        goto error1;

    spin_lock_init(&src_mgr->mgr_lock);
    conj_mask = ((struct hw *)hw)->src_dirty_conj_mask();

    src_mgr->get_src = get_src_rsc;
    src_mgr->put_src = put_src_rsc;
    src_mgr->src_enable_s = src_enable_s;
    src_mgr->src_enable = src_enable;
    src_mgr->src_disable = src_disable;
    src_mgr->commit_write = src_mgr_commit_write;

    /* Disable all SRC resources. */
    for (i = 0; i < 256; i++)
        ((struct hw *)hw)->src_mgr_dsb_src(src_mgr->mgr.ctrl_blk, i);

    ((struct hw *)hw)->src_mgr_commit_write(hw, src_mgr->mgr.ctrl_blk);

    *rsrc_mgr = src_mgr;

    return 0;

error1:
    kfree(src_mgr);
    return err;
}

int src_mgr_destroy(struct src_mgr *src_mgr)
{
    rsc_mgr_uninit(&src_mgr->mgr);
    kfree(src_mgr);

    return 0;
}

/* SRCIMP resource manager operations */

static int srcimp_master(struct rsc *rsc)
{
    rsc->conj = 0;
    return rsc->idx = container_of(rsc, struct srcimp, rsc)->idx[0];
}

static int srcimp_next_conj(struct rsc *rsc)
{
    rsc->conj++;
    return container_of(rsc, struct srcimp, rsc)->idx[rsc->conj];
}

static int srcimp_index(const struct rsc *rsc)
{
    return container_of(rsc, struct srcimp, rsc)->idx[rsc->conj];
}

static struct rsc_ops srcimp_basic_rsc_ops = {
    .master     = srcimp_master,
    .next_conj  = srcimp_next_conj,
    .index      = srcimp_index,
    .output_slot    = NULL,
};

static int srcimp_map(struct srcimp *srcimp, struct src *src, struct rsc *input)
{
    struct imapper *entry;
    int i;

    srcimp->rsc.ops->master(&srcimp->rsc);
    src->rsc.ops->master(&src->rsc);
    input->ops->master(input);

    /* Program master and conjugate resources */
    for (i = 0; i < srcimp->rsc.msr; i++) {
        entry = &srcimp->imappers[i];
        entry->slot = input->ops->output_slot(input);
        entry->user = src->rsc.ops->index(&src->rsc);
        entry->addr = srcimp->rsc.ops->index(&srcimp->rsc);
        srcimp->mgr->imap_add(srcimp->mgr, entry);
        srcimp->mapped |= (0x1 << i);

        srcimp->rsc.ops->next_conj(&srcimp->rsc);
        input->ops->next_conj(input);
    }

    srcimp->rsc.ops->master(&srcimp->rsc);
    input->ops->master(input);

    return 0;
}

static int srcimp_unmap(struct srcimp *srcimp)
{
    int i;

    /* Program master and conjugate resources */
    for (i = 0; i < srcimp->rsc.msr; i++) {
        if (srcimp->mapped & (0x1 << i)) {
            srcimp->mgr->imap_delete(srcimp->mgr,
                         &srcimp->imappers[i]);
            srcimp->mapped &= ~(0x1 << i);
        }
    }

    return 0;
}

static struct srcimp_rsc_ops srcimp_ops = {
    .map = srcimp_map,
    .unmap = srcimp_unmap
};

static int srcimp_rsc_init(struct srcimp *srcimp,
               const struct srcimp_desc *desc,
               struct srcimp_mgr *mgr)
{
    int err;

    err = rsc_init(&srcimp->rsc, srcimp->idx[0],
               SRCIMP, desc->msr, mgr->mgr.hw);
    if (err)
        return err;

    /* Reserve memory for imapper nodes */
    srcimp->imappers = kzalloc(sizeof(struct imapper)*desc->msr,
                   GFP_KERNEL);
    if (!srcimp->imappers) {
        err = -ENOMEM;
        goto error1;
    }

    /* Set srcimp specific operations */
    srcimp->rsc.ops = &srcimp_basic_rsc_ops;
    srcimp->ops = &srcimp_ops;
    srcimp->mgr = mgr;

    srcimp->rsc.ops->master(&srcimp->rsc);

    return 0;

error1:
    rsc_uninit(&srcimp->rsc);
    return err;
}

static int srcimp_rsc_uninit(struct srcimp *srcimp)
{
    if (NULL != srcimp->imappers) {
        kfree(srcimp->imappers);
        srcimp->imappers = NULL;
    }
    srcimp->ops = NULL;
    srcimp->mgr = NULL;
    rsc_uninit(&srcimp->rsc);

    return 0;
}

static int get_srcimp_rsc(struct srcimp_mgr *mgr,
              const struct srcimp_desc *desc,
              struct srcimp **rsrcimp)
{
    int err, i;
    unsigned int idx;
    struct srcimp *srcimp;
    unsigned long flags;

    *rsrcimp = NULL;

    /* Allocate mem for SRCIMP resource */
    srcimp = kzalloc(sizeof(*srcimp), GFP_KERNEL);
    if (!srcimp)
        return -ENOMEM;

    /* Check whether there are sufficient SRCIMP resources. */
    err = 0;
    spin_lock_irqsave(&mgr->mgr_lock, flags);
    for (i = 0; i < desc->msr; i++) {
        err = mgr_get_resource(&mgr->mgr, 1, &idx);
        if (err)
            break;

        srcimp->idx[i] = idx;
    }
    spin_unlock_irqrestore(&mgr->mgr_lock, flags);
    if (err) {
        printk(KERN_ERR "ctxfi: Can't meet SRCIMP resource request!\n");
        goto error1;
    }

    err = srcimp_rsc_init(srcimp, desc, mgr);
    if (err)
        goto error1;

    *rsrcimp = srcimp;

    return 0;

error1:
    spin_lock_irqsave(&mgr->mgr_lock, flags);
    for (i--; i >= 0; i--)
        mgr_put_resource(&mgr->mgr, 1, srcimp->idx[i]);

    spin_unlock_irqrestore(&mgr->mgr_lock, flags);
    kfree(srcimp);
    return err;
}

static int put_srcimp_rsc(struct srcimp_mgr *mgr, struct srcimp *srcimp)
{
    unsigned long flags;
    int i;

    spin_lock_irqsave(&mgr->mgr_lock, flags);
    for (i = 0; i < srcimp->rsc.msr; i++)
        mgr_put_resource(&mgr->mgr, 1, srcimp->idx[i]);

    spin_unlock_irqrestore(&mgr->mgr_lock, flags);
    srcimp_rsc_uninit(srcimp);
    kfree(srcimp);

    return 0;
}

static int srcimp_map_op(void *data, struct imapper *entry)
{
    struct rsc_mgr *mgr = &((struct srcimp_mgr *)data)->mgr;
    struct hw *hw = mgr->hw;

    hw->srcimp_mgr_set_imaparc(mgr->ctrl_blk, entry->slot);
    hw->srcimp_mgr_set_imapuser(mgr->ctrl_blk, entry->user);
    hw->srcimp_mgr_set_imapnxt(mgr->ctrl_blk, entry->next);
    hw->srcimp_mgr_set_imapaddr(mgr->ctrl_blk, entry->addr);
    hw->srcimp_mgr_commit_write(mgr->hw, mgr->ctrl_blk);

    return 0;
}

static int srcimp_imap_add(struct srcimp_mgr *mgr, struct imapper *entry)
{
    unsigned long flags;
    int err;

    spin_lock_irqsave(&mgr->imap_lock, flags);
    if ((0 == entry->addr) && (mgr->init_imap_added)) {
        input_mapper_delete(&mgr->imappers,
                    mgr->init_imap, srcimp_map_op, mgr);
        mgr->init_imap_added = 0;
    }
    err = input_mapper_add(&mgr->imappers, entry, srcimp_map_op, mgr);
    spin_unlock_irqrestore(&mgr->imap_lock, flags);

    return err;
}

static int srcimp_imap_delete(struct srcimp_mgr *mgr, struct imapper *entry)
{
    unsigned long flags;
    int err;

    spin_lock_irqsave(&mgr->imap_lock, flags);
    err = input_mapper_delete(&mgr->imappers, entry, srcimp_map_op, mgr);
    if (list_empty(&mgr->imappers)) {
        input_mapper_add(&mgr->imappers, mgr->init_imap,
                 srcimp_map_op, mgr);
        mgr->init_imap_added = 1;
    }
    spin_unlock_irqrestore(&mgr->imap_lock, flags);

    return err;
}

int srcimp_mgr_create(void *hw, struct srcimp_mgr **rsrcimp_mgr)
{
    int err;
    struct srcimp_mgr *srcimp_mgr;
    struct imapper *entry;

    *rsrcimp_mgr = NULL;
    srcimp_mgr = kzalloc(sizeof(*srcimp_mgr), GFP_KERNEL);
    if (!srcimp_mgr)
        return -ENOMEM;

    err = rsc_mgr_init(&srcimp_mgr->mgr, SRCIMP, SRCIMP_RESOURCE_NUM, hw);
    if (err)
        goto error1;

    spin_lock_init(&srcimp_mgr->mgr_lock);
    spin_lock_init(&srcimp_mgr->imap_lock);
    INIT_LIST_HEAD(&srcimp_mgr->imappers);
    entry = kzalloc(sizeof(*entry), GFP_KERNEL);
    if (!entry) {
        err = -ENOMEM;
        goto error2;
    }
    entry->slot = entry->addr = entry->next = entry->user = 0;
    list_add(&entry->list, &srcimp_mgr->imappers);
    srcimp_mgr->init_imap = entry;
    srcimp_mgr->init_imap_added = 1;

    srcimp_mgr->get_srcimp = get_srcimp_rsc;
    srcimp_mgr->put_srcimp = put_srcimp_rsc;
    srcimp_mgr->imap_add = srcimp_imap_add;
    srcimp_mgr->imap_delete = srcimp_imap_delete;

    *rsrcimp_mgr = srcimp_mgr;

    return 0;

error2:
    rsc_mgr_uninit(&srcimp_mgr->mgr);
error1:
    kfree(srcimp_mgr);
    return err;
}

int srcimp_mgr_destroy(struct srcimp_mgr *srcimp_mgr)
{
    unsigned long flags;

    /* free src input mapper list */
    spin_lock_irqsave(&srcimp_mgr->imap_lock, flags);
    free_input_mapper_list(&srcimp_mgr->imappers);
    spin_unlock_irqrestore(&srcimp_mgr->imap_lock, flags);

    rsc_mgr_uninit(&srcimp_mgr->mgr);
    kfree(srcimp_mgr);

    return 0;
}