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>

1 files changed, 79 insertions, 2 deletions

diff --git a/crypto/842.c b/crypto/842.c
index 98e387efb8c8..bc26dc942821 100644
--- a/crypto/842.c
+++ b/crypto/842.c
@@ -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);