From patchwork Tue May 7 16:29:22 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: 13657431 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 C95C716DEAE; Tue, 7 May 2024 16:29:31 +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=1715099373; cv=none; b=oDjaL1InRKYyZEcjVvVqbRnsV3X7ZOKVzSm0GlnTE50f7zcKJyC1h5zxQfnh6sDWDlVzoQdSl6hSrd6npXTVTrV52aAuzFV6gbtdv63wcnXzmtUIAHu2X1hyH44MEWYgdXNwTrhZSWXN4v8tqZcI14fJRZX0zBFhXaM6vLbvsCc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715099373; c=relaxed/simple; bh=HCMyhrEyLFujXuxhyn2vJharsJdwklcQIpTdK3j/XmQ=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=SwYCHEF/gfFdDj8ji/MnLhdfk3qAtTXailRRJuXDrS2AWxicQlqqJfRZ4AVZoGlgCYM4ZR2m3hAX8UN4hKuBnu7rSYjcOVxIgc50WoyGqx4g2e+8ONKNaxqE/DJwIM36C1ltKRyCPzCrWU8Ze0Sp4gaa/ntpg06CdnhZicKX+d8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none 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=fdx6JLA1; arc=none smtp.client-ip=159.69.126.157 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none 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="fdx6JLA1" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=weissschuh.net; s=mail; t=1715099369; bh=HCMyhrEyLFujXuxhyn2vJharsJdwklcQIpTdK3j/XmQ=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=fdx6JLA1LNHGHRhnS4My6GHROht4NnuPIBI/4u6RiGw11oMkQ1S9Q554j91fZiEyb 5mZT5jgEnuVCKqSeftBzQBcB+J6TEXJ2V/gBxdRwdAZtQwssxlKX4y0Y2MiY7CB6ln A1QzPSAQvkx3G7mnQgHN9gOeGQS32mD8Oq3wxgh8= From: =?utf-8?q?Thomas_Wei=C3=9Fschuh?= Date: Tue, 07 May 2024 18:29:22 +0200 Subject: [PATCH v2 1/2] hwmon: add ChromeOS EC driver Precedence: bulk X-Mailing-List: linux-hwmon@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240507-cros_ec-hwmon-v2-1-1222c5fca0f7@weissschuh.net> References: <20240507-cros_ec-hwmon-v2-0-1222c5fca0f7@weissschuh.net> In-Reply-To: <20240507-cros_ec-hwmon-v2-0-1222c5fca0f7@weissschuh.net> To: Jean Delvare , Guenter Roeck , Benson Leung , Lee Jones Cc: Guenter Roeck , linux-kernel@vger.kernel.org, linux-hwmon@vger.kernel.org, chrome-platform@lists.linux.dev, Dustin Howett , Mario Limonciello , Moritz Fischer , =?utf-8?q?Thomas_Wei=C3=9Fschuh?= X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1715099369; l=11569; i=linux@weissschuh.net; s=20221212; h=from:subject:message-id; bh=HCMyhrEyLFujXuxhyn2vJharsJdwklcQIpTdK3j/XmQ=; b=flz4ZSF7TKiDf707160wY0IS+qJPDd/H0FWMZYS+kvx54et8LJ+tLwvi3PDWrf9ZMrk9MG22f iCOgQmHOmInAPr3FPK/MO7GVIywTXjF4JmfZlAw4TM+SVTf88NRqI8T X-Developer-Key: i=linux@weissschuh.net; a=ed25519; pk=KcycQgFPX2wGR5azS7RhpBqedglOZVgRPfdFSPB1LNw= The ChromeOS Embedded Controller exposes fan speed and temperature readings. Expose this data through the hwmon subsystem. The driver is designed to be probed via the cros_ec mfd device. Signed-off-by: Thomas Weißschuh --- Documentation/hwmon/cros_ec_hwmon.rst | 26 ++++ Documentation/hwmon/index.rst | 1 + MAINTAINERS | 8 + drivers/hwmon/Kconfig | 11 ++ drivers/hwmon/Makefile | 1 + drivers/hwmon/cros_ec_hwmon.c | 269 ++++++++++++++++++++++++++++++++++ 6 files changed, 316 insertions(+) diff --git a/Documentation/hwmon/cros_ec_hwmon.rst b/Documentation/hwmon/cros_ec_hwmon.rst new file mode 100644 index 000000000000..aeb88c79d11b --- /dev/null +++ b/Documentation/hwmon/cros_ec_hwmon.rst @@ -0,0 +1,26 @@ +.. SPDX-License-Identifier: GPL-2.0-or-later + +Kernel driver cros_ec_hwmon +=========================== + +Supported chips: + + * ChromeOS embedded controllers connected via LPC + + Prefix: 'cros_ec' + + Addresses scanned: - + +Author: + + - Thomas Weißschuh + +Description +----------- + +This driver implements support for hardware monitoring commands exposed by the +ChromeOS embedded controller used in Chromebooks and other devices. + +The channel labels exposed via hwmon are retrieved from the EC itself. + +Fan and temperature readings are supported. diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst index 1ca7a4fe1f8f..355a83e66928 100644 --- a/Documentation/hwmon/index.rst +++ b/Documentation/hwmon/index.rst @@ -57,6 +57,7 @@ Hardware Monitoring Kernel Drivers coretemp corsair-cpro corsair-psu + cros_ec_hwmon da9052 da9055 dell-smm-hwmon diff --git a/MAINTAINERS b/MAINTAINERS index c23fda1aa1f0..aa5689169eca 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -4988,6 +4988,14 @@ S: Maintained F: Documentation/devicetree/bindings/sound/google,cros-ec-codec.yaml F: sound/soc/codecs/cros_ec_codec.* +CHROMEOS EC HARDWARE MONITORING +M: Thomas Weißschuh +L: chrome-platform@lists.linux.dev +L: linux-hwmon@vger.kernel.org +S: Maintained +F: Documentation/hwmon/chros_ec_hwmon.rst +F: drivers/hwmon/cros_ec_hwmon.c + CHROMEOS EC SUBDRIVERS M: Benson Leung R: Guenter Roeck diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index 83945397b6eb..c1284d42697f 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -506,6 +506,17 @@ config SENSORS_CORSAIR_PSU This driver can also be built as a module. If so, the module will be called corsair-psu. +config SENSORS_CROS_EC + tristate "ChromeOS Embedded Controller sensors" + depends on MFD_CROS_EC_DEV + default MFD_CROS_EC_DEV + help + If you say yes here you get support for ChromeOS Embedded Controller + sensors. + + This driver can also be built as a module. If so, the module + will be called cros_ec_hwmon. + config SENSORS_DRIVETEMP tristate "Hard disk drives with temperature sensors" depends on SCSI && ATA diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index 5c31808f6378..8519a6b36c00 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -64,6 +64,7 @@ obj-$(CONFIG_SENSORS_CHIPCAP2) += chipcap2.o obj-$(CONFIG_SENSORS_CORETEMP) += coretemp.o obj-$(CONFIG_SENSORS_CORSAIR_CPRO) += corsair-cpro.o obj-$(CONFIG_SENSORS_CORSAIR_PSU) += corsair-psu.o +obj-$(CONFIG_SENSORS_CROS_EC) += cros_ec_hwmon.o obj-$(CONFIG_SENSORS_DA9052_ADC)+= da9052-hwmon.o obj-$(CONFIG_SENSORS_DA9055)+= da9055-hwmon.o obj-$(CONFIG_SENSORS_DELL_SMM) += dell-smm-hwmon.o diff --git a/drivers/hwmon/cros_ec_hwmon.c b/drivers/hwmon/cros_ec_hwmon.c new file mode 100644 index 000000000000..d59d39df2ac4 --- /dev/null +++ b/drivers/hwmon/cros_ec_hwmon.c @@ -0,0 +1,269 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * ChromesOS EC driver for hwmon + * + * Copyright (C) 2024 Thomas Weißschuh + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define DRV_NAME "cros-ec-hwmon" + +struct cros_ec_hwmon_priv { + struct cros_ec_device *cros_ec; + u8 thermal_version; + const char *temp_sensor_names[EC_TEMP_SENSOR_ENTRIES + EC_TEMP_SENSOR_B_ENTRIES]; +}; + +static int cros_ec_hwmon_read_fan_speed(struct cros_ec_device *cros_ec, u8 index, u16 *speed) +{ + u16 data; + int ret; + + ret = cros_ec->cmd_readmem(cros_ec, EC_MEMMAP_FAN + index * 2, 2, &data); + if (ret < 0) + return ret; + + data = le16_to_cpu(data); + + if (data == EC_FAN_SPEED_NOT_PRESENT) + return -ENODEV; + + *speed = data; + return 0; +} + +static int cros_ec_hwmon_read_temp(struct cros_ec_device *cros_ec, u8 thermal_version, + u8 index, u8 *data) +{ + unsigned int offset; + int ret; + + if (index < EC_TEMP_SENSOR_ENTRIES) + offset = EC_MEMMAP_TEMP_SENSOR + index; + else + offset = EC_MEMMAP_TEMP_SENSOR_B + index - EC_TEMP_SENSOR_ENTRIES; + + ret = cros_ec->cmd_readmem(cros_ec, offset, 1, data); + if (ret < 0) + return ret; + + if (*data == EC_TEMP_SENSOR_NOT_PRESENT || + *data == EC_TEMP_SENSOR_ERROR || + *data == EC_TEMP_SENSOR_NOT_POWERED || + *data == EC_TEMP_SENSOR_NOT_CALIBRATED) + return -ENODEV; + + return 0; +} + +static int cros_ec_hwmon_read(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, long *val) +{ + struct cros_ec_hwmon_priv *priv = dev_get_drvdata(dev); + int ret = -ENODATA; + u16 speed; + u8 temp; + + if (type == hwmon_fan) { + ret = cros_ec_hwmon_read_fan_speed(priv->cros_ec, channel, &speed); + if (ret == 0) + *val = speed; + } else if (type == hwmon_temp) { + ret = cros_ec_hwmon_read_temp(priv->cros_ec, priv->thermal_version, channel, &temp); + if (ret == 0) + *val = kelvin_to_millicelsius((((long)temp) + EC_TEMP_SENSOR_OFFSET)); + } + + return ret; +} + +static int cros_ec_hwmon_get_temp_sensor_info(struct cros_ec_device *cros_ec, u8 id, + struct ec_response_temp_sensor_get_info *resp) +{ + int ret; + struct { + struct cros_ec_command msg; + union { + struct ec_params_temp_sensor_get_info req; + struct ec_response_temp_sensor_get_info resp; + } __packed data; + } __packed buf = { + .msg = { + .version = 0, + .command = EC_CMD_TEMP_SENSOR_GET_INFO, + .insize = sizeof(buf.data.resp), + .outsize = sizeof(buf.data.req), + }, + .data.req.id = id, + }; + + ret = cros_ec_cmd_xfer_status(cros_ec, &buf.msg); + if (ret < 0) + return ret; + + *resp = buf.data.resp; + return 0; +} + +static int cros_ec_hwmon_read_string(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, const char **str) +{ + struct cros_ec_hwmon_priv *priv = dev_get_drvdata(dev); + + if (type == hwmon_temp && attr == hwmon_temp_label) { + *str = priv->temp_sensor_names[channel]; + return 0; + } + + return -ENODATA; +} + +static umode_t cros_ec_hwmon_is_visible(const void *data, enum hwmon_sensor_types type, + u32 attr, int channel) +{ + const struct cros_ec_hwmon_priv *priv = data; + u16 speed; + + if (type == hwmon_fan) { + if (cros_ec_hwmon_read_fan_speed(priv->cros_ec, channel, &speed) == 0) + return 0444; + } else if (type == hwmon_temp) { + if (priv->temp_sensor_names[channel]) + return 0444; + } + + return 0; +} + +static const struct hwmon_channel_info * const cros_ec_hwmon_info[] = { + HWMON_CHANNEL_INFO(fan, + HWMON_F_INPUT, + HWMON_F_INPUT, + HWMON_F_INPUT, + HWMON_F_INPUT), + HWMON_CHANNEL_INFO(temp, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL), + NULL +}; + +static const struct hwmon_ops cros_ec_hwmon_ops = { + .read = cros_ec_hwmon_read, + .read_string = cros_ec_hwmon_read_string, + .is_visible = cros_ec_hwmon_is_visible, +}; + +static const struct hwmon_chip_info cros_ec_hwmon_chip_info = { + .ops = &cros_ec_hwmon_ops, + .info = cros_ec_hwmon_info, +}; + +static void cros_ec_hwmon_probe_temp_sensors(struct device *dev, struct cros_ec_hwmon_priv *priv) +{ + struct ec_response_temp_sensor_get_info info; + size_t candidates, i; + int ret; + u8 temp; + + if (priv->thermal_version < 2) + candidates = EC_TEMP_SENSOR_ENTRIES; + else + candidates = ARRAY_SIZE(priv->temp_sensor_names); + + for (i = 0; i < candidates; i++) { + if (cros_ec_hwmon_read_temp(priv->cros_ec, priv->thermal_version, i, &temp) != 0) + continue; + + ret = cros_ec_hwmon_get_temp_sensor_info(priv->cros_ec, i, &info); + if (ret < 0) + continue; + + priv->temp_sensor_names[i] = devm_kasprintf(dev, GFP_KERNEL, "%*s", + (int)sizeof(info.sensor_name), + info.sensor_name); + } +} + +static int cros_ec_hwmon_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct cros_ec_dev *ec_dev = dev_get_drvdata(dev->parent); + struct cros_ec_device *cros_ec = ec_dev->ec_dev; + struct cros_ec_hwmon_priv *priv; + struct device *hwmon_dev; + int ret; + + /* Not every platform supports direct reads */ + if (!cros_ec->cmd_readmem) + return -ENODEV; + + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->cros_ec = cros_ec; + + ret = priv->cros_ec->cmd_readmem(cros_ec, EC_MEMMAP_THERMAL_VERSION, + 1, &priv->thermal_version); + if (ret < 0) + return ret; + + /* Covers both fan and temp sensors */ + if (!priv->thermal_version) + return -ENODEV; + + cros_ec_hwmon_probe_temp_sensors(dev, priv); + + hwmon_dev = devm_hwmon_device_register_with_info(dev, "cros_ec", priv, + &cros_ec_hwmon_chip_info, NULL); + + return PTR_ERR_OR_ZERO(hwmon_dev); +} + +static const struct platform_device_id cros_ec_hwmon_id[] = { + { DRV_NAME, 0 }, + { } +}; + +static struct platform_driver cros_ec_hwmon_driver = { + .driver.name = DRV_NAME, + .probe = cros_ec_hwmon_probe, + .id_table = cros_ec_hwmon_id, +}; +module_platform_driver(cros_ec_hwmon_driver); + +MODULE_DEVICE_TABLE(platform, cros_ec_hwmon_id); +MODULE_DESCRIPTION("ChromeOS EC Hardware Monitoring Driver"); +MODULE_AUTHOR("Thomas Weißschuh