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crypto: acomp - add support for 842 via scomp 

Add scomp backend for 842 compression algorithm.

Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
zero-colors
Giovanni Cabiddu 2016-10-21 13:19:52 +01:00 committed by Herbert Xu
parent 91d53d96e2
commit 6a8de3aefb
2 changed files with 80 additions and 2 deletions
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81
crypto/842.c
View File

@ -31,11 +31,46 @@
#include <linux/module.h>
#include <linux/crypto.h>
#include <linux/sw842.h>
#include <crypto/internal/scompress.h>
struct crypto842_ctx {
char wmem[SW842_MEM_COMPRESS]; /* working memory for compress */
void *wmem; /* working memory for compress */
};
static void *crypto842_alloc_ctx(struct crypto_scomp *tfm)
{
void *ctx;
ctx = kmalloc(SW842_MEM_COMPRESS, GFP_KERNEL);
if (!ctx)
return ERR_PTR(-ENOMEM);
return ctx;
}
static int crypto842_init(struct crypto_tfm *tfm)
{
struct crypto842_ctx *ctx = crypto_tfm_ctx(tfm);
ctx->wmem = crypto842_alloc_ctx(NULL);
if (IS_ERR(ctx->wmem))
return -ENOMEM;
return 0;
}
static void crypto842_free_ctx(struct crypto_scomp *tfm, void *ctx)
{
kfree(ctx);
}
static void crypto842_exit(struct crypto_tfm *tfm)
{
struct crypto842_ctx *ctx = crypto_tfm_ctx(tfm);
crypto842_free_ctx(NULL, ctx->wmem);
}
static int crypto842_compress(struct crypto_tfm *tfm,
const u8 *src, unsigned int slen,
u8 *dst, unsigned int *dlen)
@ -45,6 +80,13 @@ static int crypto842_compress(struct crypto_tfm *tfm,
return sw842_compress(src, slen, dst, dlen, ctx->wmem);
}
static int crypto842_scompress(struct crypto_scomp *tfm,
const u8 *src, unsigned int slen,
u8 *dst, unsigned int *dlen, void *ctx)
{
return sw842_compress(src, slen, dst, dlen, ctx);
}
static int crypto842_decompress(struct crypto_tfm *tfm,
const u8 *src, unsigned int slen,
u8 *dst, unsigned int *dlen)
@ -52,6 +94,13 @@ static int crypto842_decompress(struct crypto_tfm *tfm,
return sw842_decompress(src, slen, dst, dlen);
}
static int crypto842_sdecompress(struct crypto_scomp *tfm,
const u8 *src, unsigned int slen,
u8 *dst, unsigned int *dlen, void *ctx)
{
return sw842_decompress(src, slen, dst, dlen);
}
static struct crypto_alg alg = {
.cra_name = "842",
.cra_driver_name = "842-generic",
@ -59,20 +108,48 @@ static struct crypto_alg alg = {
.cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
.cra_ctxsize = sizeof(struct crypto842_ctx),
.cra_module = THIS_MODULE,
.cra_init = crypto842_init,
.cra_exit = crypto842_exit,
.cra_u = { .compress = {
.coa_compress = crypto842_compress,
.coa_decompress = crypto842_decompress } }
};
static struct scomp_alg scomp = {
.alloc_ctx = crypto842_alloc_ctx,
.free_ctx = crypto842_free_ctx,
.compress = crypto842_scompress,
.decompress = crypto842_sdecompress,
.base = {
.cra_name = "842",
.cra_driver_name = "842-scomp",
.cra_priority = 100,
.cra_module = THIS_MODULE,
}
};
static int __init crypto842_mod_init(void)
{
return crypto_register_alg(&alg);
int ret;
ret = crypto_register_alg(&alg);
if (ret)
return ret;
ret = crypto_register_scomp(&scomp);
if (ret) {
crypto_unregister_alg(&alg);
return ret;
}
return ret;
}
module_init(crypto842_mod_init);
static void __exit crypto842_mod_exit(void)
{
crypto_unregister_alg(&alg);
crypto_unregister_scomp(&scomp);
}
module_exit(crypto842_mod_exit);

1
crypto/Kconfig
View File

@ -1598,6 +1598,7 @@ config CRYPTO_LZO
config CRYPTO_842
tristate "842 compression algorithm"
select CRYPTO_ALGAPI
select CRYPTO_ACOMP2
select 842_COMPRESS
select 842_DECOMPRESS
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