From patchwork Sat Jun 8 08:12:43 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: 13690846 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 72DD1176AB4; Sat, 8 Jun 2024 08:12:48 +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=1717834372; cv=none; b=FyCtJdfdbEzLqS4GJaBEgCf6V5wQWqjOgLK89vMacbIE8ch3dZSpY27SMUmahlTpLx/DvZ6FtNhqijoqnLqEJNsW/dlIFc8Yd5X3LzXFTA88nFJXaQArPqKEDoiB1bP7etZWfjx/3L2DFk1g21zg3D297aUmORir4DkYCR81LRM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717834372; c=relaxed/simple; bh=fw/y4pJzNvdZK5afG+PBEc6PoUftleG4LWfjkyyWgdE=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=A2QkdPbwIRz6sEaHkddhNUCaAVCdf/Esue+aMckgU2EP4Z/VBr1KsCnwryiuCeHqkvl9ySNDb0xhyKn5B0L4VHnJm+7nri6IgtLRNKmwOWPLX/ryTiLsDhepBP49awog+dlquPHi1rU3GKtd68urNlcttR/eZDxGanoHqqU5Arw= 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=hDGxVpzr; 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="hDGxVpzr" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=weissschuh.net; s=mail; t=1717834365; bh=fw/y4pJzNvdZK5afG+PBEc6PoUftleG4LWfjkyyWgdE=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=hDGxVpzr4v6gAQwt4+MQ66E5eH90CFQbiNBcikb+fdfVzDvTZkLnreacjF7gg8eYu o4U5QADxXE1ci2VR0FtORdU5J4uMGh0gopS0D/JJN2gtNJFA3ba+9jLXKcnXUoqoTg kWnTz4N/sBiMPE1DZdSIEVV4UE+ZN2X3AmNRW/mk= From: =?utf-8?q?Thomas_Wei=C3=9Fschuh?= Date: Sat, 08 Jun 2024 10:12:43 +0200 Subject: [PATCH 1/5] platform/chrome: cros_ec_proto: Introduce cros_ec_cmd_versions() Precedence: bulk X-Mailing-List: linux-hwmon@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240608-cros_ec-hwmon-pwm-v1-1-d29dfc26fbc3@weissschuh.net> References: <20240608-cros_ec-hwmon-pwm-v1-0-d29dfc26fbc3@weissschuh.net> In-Reply-To: <20240608-cros_ec-hwmon-pwm-v1-0-d29dfc26fbc3@weissschuh.net> To: Benson Leung , Tzung-Bi Shih , Guenter Roeck , =?utf-8?q?Thomas_Wei=C3=9Fschuh?= , Jean Delvare , Guenter Roeck Cc: Dustin Howett , Mario Limonciello , Stephen Horvath , chrome-platform@lists.linux.dev, linux-kernel@vger.kernel.org, linux-hwmon@vger.kernel.org, =?utf-8?q?Thoma?= =?utf-8?q?s_Wei=C3=9Fschuh?= X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1717834364; l=2290; i=linux@weissschuh.net; s=20221212; h=from:subject:message-id; bh=fw/y4pJzNvdZK5afG+PBEc6PoUftleG4LWfjkyyWgdE=; b=Dapg4fmR1zg9VbRdnm6FMME0ObVhZaPf2rel7zyHMY2xz8MFj6Pzop/fpuX0q7arf5JIWX+7O Pu80aZ3RhZ9C809lKbIP9LCgv98GdKy2n8nHnVG6wiYFCByb5VpWuMZ 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. Signed-off-by: Thomas Weißschuh --- drivers/platform/chrome/cros_ec_proto.c | 26 ++++++++++++++++++++++++++ include/linux/platform_data/cros_ec_proto.h | 2 ++ 2 files changed, 28 insertions(+) diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c index fe68be66ee98..9cfe885a5301 100644 --- a/drivers/platform/chrome/cros_ec_proto.c +++ b/drivers/platform/chrome/cros_ec_proto.c @@ -1069,3 +1069,29 @@ 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_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_cmd_versions(struct cros_ec_device *ec_dev, u16 cmd) +{ + struct ec_params_get_cmd_versions_v1 req = {}; + struct ec_response_get_cmd_versions resp; + int ret; + + req.cmd = cmd; + ret = cros_ec_cmd(ec_dev, 1, EC_CMD_GET_CMD_VERSIONS, + &req, sizeof(req), &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_cmd_versions); diff --git a/include/linux/platform_data/cros_ec_proto.h b/include/linux/platform_data/cros_ec_proto.h index 6e9225bdf903..98ab5986f543 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_cmd_versions(struct cros_ec_device *ec_dev, u16 cmd); + /** * cros_ec_get_time_ns() - Return time in ns. *