From patchwork Sun Jun 30 20:54:10 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Thomas_Wei=C3=9Fschuh?= X-Patchwork-Id: 809158 Received: from todd.t-8ch.de (todd.t-8ch.de [159.69.126.157]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CB96F433D2; Sun, 30 Jun 2024 20:57:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=159.69.126.157 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719781027; cv=none; b=iIN8FSEgG4F+3VC4tYdOod6sJ2e41/GTh/X00eNx8U/YoAAYqQBzZpNsV7/sNBeuRf4m5a/zBKA8D8qBWw/YVSKK5AqkScY8+uRewjc578f+xfUHXyzdQCTq4T7R8HrrkXZPNEDmI+Kv+1X8xVrek60F5ErP1sqMfMaYWzDRC9M= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719781027; c=relaxed/simple; bh=HfNMeLsLGK3GWeWdm8PDMkaGehstSeUbS2E/1F3j/j8=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=LlSAX712eoJx0mm3uZlpOPoqqqlBSvI+QXSNOdJ20aBwHS5eDPgCc5/bi765SwhCoQYvuh4lejyeA+UnGa3jb7rEmLO+Qv8E32ZQJtXJt/32iDHUNSx8kHGX2V0JCmN59rCNo6imlB5yjURYMItFb//IHPy7hOJ8AgFxAdQV2Sk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=weissschuh.net; spf=pass smtp.mailfrom=weissschuh.net; dkim=pass (1024-bit key) header.d=weissschuh.net header.i=@weissschuh.net header.b=egr/LSvP; arc=none smtp.client-ip=159.69.126.157 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=weissschuh.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=weissschuh.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=weissschuh.net header.i=@weissschuh.net header.b="egr/LSvP" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=weissschuh.net; s=mail; t=1719781013; bh=HfNMeLsLGK3GWeWdm8PDMkaGehstSeUbS2E/1F3j/j8=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=egr/LSvPDvA3j/9HdQ6I3CE5Q+GS1MMGkd4YcDK+BsqN7xlMhPTJatqAL9wzu4mbD DFX2Amzxstl/cLJq0+3b7ho3jDV1gKfUin7krOfBccGpSSycmIXHdXZ8P7FbZwvi7O lwULwGlHLAqi2VPQ3ev6mwYnVfaM2dRbhglrln+s= From: =?utf-8?q?Thomas_Wei=C3=9Fschuh?= Date: Sun, 30 Jun 2024 22:54:10 +0200 Subject: [PATCH v5 3/5] platform/chrome: cros_ec_proto: Introduce cros_ec_get_cmd_versions() Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240630-cros_ec-charge-control-v5-3-8f649d018c52@weissschuh.net> References: <20240630-cros_ec-charge-control-v5-0-8f649d018c52@weissschuh.net> In-Reply-To: <20240630-cros_ec-charge-control-v5-0-8f649d018c52@weissschuh.net> To: Benson Leung , Guenter Roeck , Sebastian Reichel , =?utf-8?q?Thomas_Wei=C3=9Fschuh?= , "Rafael J. Wysocki" , Len Brown , Robert Moore , Tzung-Bi Shih Cc: chrome-platform@lists.linux.dev, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, Mario Limonciello , Dustin Howett , Stephen Horvath , Rajas Paranjpe , linux-acpi@vger.kernel.org, acpica-devel@lists.linux.dev, Matt Hartley , Kieran Levin , =?utf-8?q?Thomas_Wei=C3=9Fschuh?= X-Mailer: b4 0.14.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1719781012; l=2821; i=linux@weissschuh.net; s=20221212; h=from:subject:message-id; bh=HfNMeLsLGK3GWeWdm8PDMkaGehstSeUbS2E/1F3j/j8=; b=8384owFHstCikEunmP6XRgZQqzrhTs9O28evm8/2oNYKdsPzZ3MAYfO27KtPXanc3hbDGG1MR pKoHUW7jUyKAewTjrhCcFnGQbrbPZ8fQ8vyzkuW0WFsUwQVk+ZEKoWG X-Developer-Key: i=linux@weissschuh.net; a=ed25519; pk=KcycQgFPX2wGR5azS7RhpBqedglOZVgRPfdFSPB1LNw= Retrieving the supported versions of a command is a fairly common operation. Provide a helper for it. If the command is not supported at all the EC returns -EINVAL/EC_RES_INVALID_PARAMS. This error is translated into an empty version mask as that is easier to handle for callers and they don't need to know about the error details. Acked-by: Tzung-Bi Shih Signed-off-by: Thomas Weißschuh --- drivers/platform/chrome/cros_ec_proto.c | 35 +++++++++++++++++++++++++++++ include/linux/platform_data/cros_ec_proto.h | 2 ++ 2 files changed, 37 insertions(+) diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c index fe68be66ee98..f776fd42244f 100644 --- a/drivers/platform/chrome/cros_ec_proto.c +++ b/drivers/platform/chrome/cros_ec_proto.c @@ -5,6 +5,7 @@ #include #include +#include #include #include #include @@ -1069,3 +1070,37 @@ int cros_ec_cmd_readmem(struct cros_ec_device *ec_dev, u8 offset, u8 size, void ¶ms, sizeof(params), dest, size); } EXPORT_SYMBOL_GPL(cros_ec_cmd_readmem); + +/** + * cros_ec_get_cmd_versions - Get supported version mask. + * + * @ec_dev: EC device + * @cmd: Command to test + * + * Return: version mask on success, negative error number on failure. + */ +int cros_ec_get_cmd_versions(struct cros_ec_device *ec_dev, u16 cmd) +{ + struct ec_params_get_cmd_versions req_v0; + struct ec_params_get_cmd_versions_v1 req_v1; + struct ec_response_get_cmd_versions resp; + int ret; + + if (cmd <= U8_MAX) { + req_v0.cmd = cmd; + ret = cros_ec_cmd(ec_dev, 0, EC_CMD_GET_CMD_VERSIONS, + &req_v0, sizeof(req_v0), &resp, sizeof(resp)); + } else { + req_v1.cmd = cmd; + ret = cros_ec_cmd(ec_dev, 1, EC_CMD_GET_CMD_VERSIONS, + &req_v1, sizeof(req_v1), &resp, sizeof(resp)); + } + + if (ret == -EINVAL) + return 0; /* Command not implemented */ + else if (ret < 0) + return ret; + else + return resp.version_mask; +} +EXPORT_SYMBOL_GPL(cros_ec_get_cmd_versions); diff --git a/include/linux/platform_data/cros_ec_proto.h b/include/linux/platform_data/cros_ec_proto.h index 6e9225bdf903..b34ed0cc1f8d 100644 --- a/include/linux/platform_data/cros_ec_proto.h +++ b/include/linux/platform_data/cros_ec_proto.h @@ -263,6 +263,8 @@ int cros_ec_cmd(struct cros_ec_device *ec_dev, unsigned int version, int command int cros_ec_cmd_readmem(struct cros_ec_device *ec_dev, u8 offset, u8 size, void *dest); +int cros_ec_get_cmd_versions(struct cros_ec_device *ec_dev, u16 cmd); + /** * cros_ec_get_time_ns() - Return time in ns. *