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![Himanshu Jha](/assets/img/avatar_default.png)
kfree on NULL pointer is a no-op and therefore checking is redundant. Signed-off-by: Himanshu Jha <himanshujha199640@gmail.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
294 lines
5.5 KiB
C
294 lines
5.5 KiB
C
/**
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* Copyright (C) 2008, Creative Technology Ltd. All Rights Reserved.
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*
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* This source file is released under GPL v2 license (no other versions).
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* See the COPYING file included in the main directory of this source
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* distribution for the license terms and conditions.
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*
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* @File ctresource.c
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*
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* @Brief
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* This file contains the implementation of some generic helper functions.
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*
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* @Author Liu Chun
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* @Date May 15 2008
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*
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*/
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#include "ctresource.h"
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#include "cthardware.h"
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#include <linux/err.h>
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#include <linux/slab.h>
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#define AUDIO_SLOT_BLOCK_NUM 256
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/* Resource allocation based on bit-map management mechanism */
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static int
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get_resource(u8 *rscs, unsigned int amount,
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unsigned int multi, unsigned int *ridx)
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{
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int i, j, k, n;
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/* Check whether there are sufficient resources to meet request. */
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for (i = 0, n = multi; i < amount; i++) {
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j = i / 8;
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k = i % 8;
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if (rscs[j] & ((u8)1 << k)) {
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n = multi;
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continue;
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}
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if (!(--n))
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break; /* found sufficient contiguous resources */
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}
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if (i >= amount) {
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/* Can not find sufficient contiguous resources */
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return -ENOENT;
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}
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/* Mark the contiguous bits in resource bit-map as used */
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for (n = multi; n > 0; n--) {
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j = i / 8;
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k = i % 8;
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rscs[j] |= ((u8)1 << k);
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i--;
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}
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*ridx = i + 1;
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return 0;
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}
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static int put_resource(u8 *rscs, unsigned int multi, unsigned int idx)
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{
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unsigned int i, j, k, n;
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/* Mark the contiguous bits in resource bit-map as used */
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for (n = multi, i = idx; n > 0; n--) {
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j = i / 8;
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k = i % 8;
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rscs[j] &= ~((u8)1 << k);
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i++;
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}
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return 0;
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}
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int mgr_get_resource(struct rsc_mgr *mgr, unsigned int n, unsigned int *ridx)
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{
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int err;
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if (n > mgr->avail)
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return -ENOENT;
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err = get_resource(mgr->rscs, mgr->amount, n, ridx);
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if (!err)
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mgr->avail -= n;
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return err;
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}
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int mgr_put_resource(struct rsc_mgr *mgr, unsigned int n, unsigned int idx)
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{
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put_resource(mgr->rscs, n, idx);
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mgr->avail += n;
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return 0;
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}
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static unsigned char offset_in_audio_slot_block[NUM_RSCTYP] = {
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/* SRC channel is at Audio Ring slot 1 every 16 slots. */
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[SRC] = 0x1,
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[AMIXER] = 0x4,
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[SUM] = 0xc,
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};
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static int rsc_index(const struct rsc *rsc)
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{
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return rsc->conj;
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}
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static int audio_ring_slot(const struct rsc *rsc)
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{
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return (rsc->conj << 4) + offset_in_audio_slot_block[rsc->type];
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}
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static int rsc_next_conj(struct rsc *rsc)
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{
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unsigned int i;
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for (i = 0; (i < 8) && (!(rsc->msr & (0x1 << i))); )
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i++;
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rsc->conj += (AUDIO_SLOT_BLOCK_NUM >> i);
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return rsc->conj;
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}
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static int rsc_master(struct rsc *rsc)
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{
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return rsc->conj = rsc->idx;
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}
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static const struct rsc_ops rsc_generic_ops = {
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.index = rsc_index,
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.output_slot = audio_ring_slot,
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.master = rsc_master,
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.next_conj = rsc_next_conj,
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};
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int
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rsc_init(struct rsc *rsc, u32 idx, enum RSCTYP type, u32 msr, struct hw *hw)
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{
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int err = 0;
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rsc->idx = idx;
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rsc->conj = idx;
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rsc->type = type;
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rsc->msr = msr;
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rsc->hw = hw;
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rsc->ops = &rsc_generic_ops;
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if (!hw) {
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rsc->ctrl_blk = NULL;
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return 0;
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}
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switch (type) {
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case SRC:
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err = hw->src_rsc_get_ctrl_blk(&rsc->ctrl_blk);
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break;
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case AMIXER:
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err = hw->amixer_rsc_get_ctrl_blk(&rsc->ctrl_blk);
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break;
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case SRCIMP:
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case SUM:
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case DAIO:
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break;
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default:
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dev_err(((struct hw *)hw)->card->dev,
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"Invalid resource type value %d!\n", type);
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return -EINVAL;
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}
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if (err) {
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dev_err(((struct hw *)hw)->card->dev,
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"Failed to get resource control block!\n");
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return err;
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}
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return 0;
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}
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int rsc_uninit(struct rsc *rsc)
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{
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if ((NULL != rsc->hw) && (NULL != rsc->ctrl_blk)) {
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switch (rsc->type) {
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case SRC:
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rsc->hw->src_rsc_put_ctrl_blk(rsc->ctrl_blk);
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break;
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case AMIXER:
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rsc->hw->amixer_rsc_put_ctrl_blk(rsc->ctrl_blk);
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break;
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case SUM:
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case DAIO:
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break;
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default:
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dev_err(((struct hw *)rsc->hw)->card->dev,
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"Invalid resource type value %d!\n",
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rsc->type);
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break;
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}
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rsc->hw = rsc->ctrl_blk = NULL;
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}
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rsc->idx = rsc->conj = 0;
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rsc->type = NUM_RSCTYP;
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rsc->msr = 0;
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return 0;
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}
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int rsc_mgr_init(struct rsc_mgr *mgr, enum RSCTYP type,
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unsigned int amount, struct hw *hw)
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{
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int err = 0;
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mgr->type = NUM_RSCTYP;
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mgr->rscs = kzalloc(((amount + 8 - 1) / 8), GFP_KERNEL);
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if (!mgr->rscs)
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return -ENOMEM;
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switch (type) {
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case SRC:
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err = hw->src_mgr_get_ctrl_blk(&mgr->ctrl_blk);
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break;
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case SRCIMP:
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err = hw->srcimp_mgr_get_ctrl_blk(&mgr->ctrl_blk);
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break;
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case AMIXER:
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err = hw->amixer_mgr_get_ctrl_blk(&mgr->ctrl_blk);
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break;
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case DAIO:
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err = hw->daio_mgr_get_ctrl_blk(hw, &mgr->ctrl_blk);
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break;
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case SUM:
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break;
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default:
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dev_err(hw->card->dev,
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"Invalid resource type value %d!\n", type);
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err = -EINVAL;
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goto error;
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}
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if (err) {
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dev_err(hw->card->dev,
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"Failed to get manager control block!\n");
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goto error;
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}
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mgr->type = type;
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mgr->avail = mgr->amount = amount;
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mgr->hw = hw;
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return 0;
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error:
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kfree(mgr->rscs);
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return err;
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}
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int rsc_mgr_uninit(struct rsc_mgr *mgr)
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{
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kfree(mgr->rscs);
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mgr->rscs = NULL;
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if ((NULL != mgr->hw) && (NULL != mgr->ctrl_blk)) {
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switch (mgr->type) {
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case SRC:
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mgr->hw->src_mgr_put_ctrl_blk(mgr->ctrl_blk);
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break;
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case SRCIMP:
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mgr->hw->srcimp_mgr_put_ctrl_blk(mgr->ctrl_blk);
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break;
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case AMIXER:
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mgr->hw->amixer_mgr_put_ctrl_blk(mgr->ctrl_blk);
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break;
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case DAIO:
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mgr->hw->daio_mgr_put_ctrl_blk(mgr->ctrl_blk);
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break;
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case SUM:
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break;
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default:
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dev_err(((struct hw *)mgr->hw)->card->dev,
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"Invalid resource type value %d!\n",
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mgr->type);
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break;
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}
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mgr->hw = mgr->ctrl_blk = NULL;
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}
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mgr->type = NUM_RSCTYP;
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mgr->avail = mgr->amount = 0;
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return 0;
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}
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