diff options
Diffstat (limited to 'drivers/crypto/nx/nx-842.c')
| -rw-r--r-- | drivers/crypto/nx/nx-842.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/drivers/crypto/nx/nx-842.c b/drivers/crypto/nx/nx-842.c index f1f378eef373..160fe2d97336 100644 --- a/drivers/crypto/nx/nx-842.c +++ b/drivers/crypto/nx/nx-842.c @@ -86,6 +86,44 @@ static void put_driver(struct nx842_driver *driver) module_put(driver->owner); } +/** + * nx842_constraints + * + * This provides the driver's constraints. Different nx842 implementations + * may have varying requirements. The constraints are: + * @alignment: All buffers should be aligned to this + * @multiple: All buffer lengths should be a multiple of this + * @minimum: Buffer lengths must not be less than this amount + * @maximum: Buffer lengths must not be more than this amount + * + * The constraints apply to all buffers and lengths, both input and output, + * for both compression and decompression, except for the minimum which + * only applies to compression input and decompression output; the + * compressed data can be less than the minimum constraint. It can be + * assumed that compressed data will always adhere to the multiple + * constraint. + * + * The driver may succeed even if these constraints are violated; + * however the driver can return failure or suffer reduced performance + * if any constraint is not met. + */ +int nx842_constraints(struct nx842_constraints *c) +{ + struct nx842_driver *driver = get_driver(); + int ret = 0; + + if (!driver) + return -ENODEV; + + BUG_ON(!c); + memcpy(c, driver->constraints, sizeof(*c)); + + put_driver(driver); + + return ret; +} +EXPORT_SYMBOL_GPL(nx842_constraints); + int nx842_compress(const unsigned char *in, unsigned int in_len, unsigned char *out, unsigned int *out_len, void *wrkmem) |