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ctsrc.c

/**
 * Copyright (C) 2008, Creative Technology Ltd. All Rights Reserved.
 *
 * This source file is released under GPL v2 license (no other versions).
 * See the COPYING file included in the main directory of this source
 * distribution for the license terms and conditions.
 *
 * @File    ctsrc.c
 *
 * @Brief
 * This file contains the implementation of the Sample Rate Convertor
 * resource management object.
 *
 * @Author  Liu Chun
 * @Date    May 13 2008
 *
 */

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

#define SRC_RESOURCE_NUM      64
#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 = kzalloc(sizeof(*src)*desc->multi, 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;
}

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