From e24328974a88aa8541e94e8bb8dfa2ade1b3c45d Mon Sep 17 00:00:00 2001 From: Donggeun Yoo Date: Wed, 2 Sep 2026 00:21:26 +0900 Subject: iio: proximity: vl53l0x-i2c: claim direct mode for raw reads vl53l0x_read_raw() starts a single-shot ranging measurement and reads back the result. Once the triggered buffer is enabled the sensor runs in continuous mode and its data-ready interrupt is routed to the trigger, so a concurrent in_distance_raw read disturbs the streaming setup and never gets its completion, returning -ETIMEDOUT. The original submission claimed direct mode here, but it was dropped during review because the driver had no buffer support at the time [1]. Continuous (buffered) mode was later added without restoring the claim [2], reintroducing the conflict. Reject direct reads while buffered capture is active by claiming direct mode around the measurement, as the vl53l1x sibling already does. Fixes: 762186c6e7b1 ("iio: proximity: vl53l0x-i2c: Added continuous mode support") Link: https://lore.kernel.org/linux-iio/20180911160300.GA9212@himanshu-Vostro-3559/ [1] Link: https://lore.kernel.org/linux-iio/20240909101508.263085-3-abhashkumarjha123@gmail.com/ [2] Signed-off-by: Donggeun Yoo Cc: stable@vger.kernel.org Signed-off-by: Jonathan Cameron --- include/crypto/poly1305.h | 67 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 67 insertions(+) create mode 100644 include/crypto/poly1305.h (limited to 'include/crypto/poly1305.h') diff --git a/include/crypto/poly1305.h b/include/crypto/poly1305.h new file mode 100644 index 000000000..190beb427 --- /dev/null +++ b/include/crypto/poly1305.h @@ -0,0 +1,67 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Common values for the Poly1305 algorithm + */ + +#ifndef _CRYPTO_POLY1305_H +#define _CRYPTO_POLY1305_H + +#include + +#define POLY1305_BLOCK_SIZE 16 +#define POLY1305_KEY_SIZE 32 +#define POLY1305_DIGEST_SIZE 16 + +/* The poly1305_key and poly1305_state types are mostly opaque and + * implementation-defined. Limbs might be in base 2^64 or base 2^26, or + * different yet. The union type provided keeps these 64-bit aligned for the + * case in which this is implemented using 64x64 multiplies. + */ + +struct poly1305_key { + union { + u32 r[5]; + u64 r64[3]; + }; +}; + +struct poly1305_core_key { + struct poly1305_key key; + struct poly1305_key precomputed_s; +}; + +struct poly1305_state { + union { + u32 h[5]; + u64 h64[3]; + }; +}; + +/* Combined state for block function. */ +struct poly1305_block_state { + /* accumulator */ + struct poly1305_state h; + /* key */ + union { + struct poly1305_key opaque_r[CONFIG_CRYPTO_LIB_POLY1305_RSIZE]; + struct poly1305_core_key core_r; + }; +}; + +struct poly1305_desc_ctx { + /* partial buffer */ + u8 buf[POLY1305_BLOCK_SIZE]; + /* bytes used in partial buffer */ + unsigned int buflen; + /* finalize key */ + u32 s[4]; + struct poly1305_block_state state; +}; + +void poly1305_init(struct poly1305_desc_ctx *desc, + const u8 key[at_least POLY1305_KEY_SIZE]); +void poly1305_update(struct poly1305_desc_ctx *desc, + const u8 *src, unsigned int nbytes); +void poly1305_final(struct poly1305_desc_ctx *desc, u8 *digest); + +#endif -- cgit v1.3.1