From patchwork Thu Jul 25 19:45:37 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Heiko Stuebner X-Patchwork-Id: 13742122 Received: from gloria.sntech.de (gloria.sntech.de [185.11.138.130]) (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 1B4B9770F5; Thu, 25 Jul 2024 19:46:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.11.138.130 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721936776; cv=none; b=deyW7DDtA6Zf3QemVXyIV6LqKeIHKlnnQJ9J4KrYn4ZCVeS24gpFqh2RVcKJrkL5kNQTHSpgADYt8tvuCHw+gLcdRJpR2f+OffXTHIOhUZS3If7JIA5U8FsLH1ykx96UyQ1Yo9GxU10ljmlB40BnRTltzAIDYury/w5aXYOnX+M= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721936776; c=relaxed/simple; bh=zfvUzOXtPa+5vynVkr2zPv4EPX+LZXeREtTWR71I2Pc=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=XwJO07vRLyMGWB0hV/qB9eIZ6h99YWxgLcWTU6WjIawdDioQp2ngWWiYyK6MMLRTFPxK6eavQYxQKDeuiOFhIjhuyz6TLLPV1o92H3LAZXEf3wzNu7YGIYDLllbae1WNat1JTYSNd9YxEGoRHRHxHhD3r8XPOWRYym9b5J8W4wg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=sntech.de; spf=pass smtp.mailfrom=sntech.de; arc=none smtp.client-ip=185.11.138.130 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=sntech.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sntech.de Received: from i5e860cdd.versanet.de ([94.134.12.221] helo=phil.lan) by gloria.sntech.de with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1sX4PQ-0001rD-Td; Thu, 25 Jul 2024 21:45:52 +0200 From: Heiko Stuebner To: lee@kernel.org, jdelvare@suse.com, linux@roeck-us.net, dmitry.torokhov@gmail.com, pavel@ucw.cz Cc: robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, heiko@sntech.de, ukleinek@debian.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-hwmon@vger.kernel.org, linux-input@vger.kernel.org, linux-leds@vger.kernel.org Subject: [PATCH 5/7] hwmon: add driver for the hwmon parts of qnap-mcu devices Date: Thu, 25 Jul 2024 21:45:37 +0200 Message-Id: <20240725194539.1780790-6-heiko@sntech.de> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240725194539.1780790-1-heiko@sntech.de> References: <20240725194539.1780790-1-heiko@sntech.de> Precedence: bulk X-Mailing-List: linux-hwmon@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The MCU can be found on network-attached-storage devices made by QNAP and provides access to fan control including reading back its RPM as well as reading the temperature of the NAS case. Signed-off-by: Heiko Stuebner --- drivers/hwmon/Kconfig | 12 ++ drivers/hwmon/Makefile | 1 + drivers/hwmon/qnap-mcu-hwmon.c | 352 +++++++++++++++++++++++++++++++++ 3 files changed, 365 insertions(+) create mode 100644 drivers/hwmon/qnap-mcu-hwmon.c diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index e14ae18a973b3..87b6ee463a967 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -1806,6 +1806,18 @@ config SENSORS_PWM_FAN This driver can also be built as a module. If so, the module will be called pwm-fan. +config SENSORS_QNAP_MCU_HWMON + tristate "QNAP MCU hardware monitoring" + depends on MFD_QNAP_MCU + depends on THERMAL || THERMAL=n + help + Say yes here to enable support for fans and temperatures sensors + connected to a QNAP MCU, as found in a number of QNAP network + attached storage devices. + + This driver can also be built as a module. If so, the module + will be called qnap-mcu-hwmon. + config SENSORS_RASPBERRYPI_HWMON tristate "Raspberry Pi voltage monitor" depends on RASPBERRYPI_FIRMWARE || (COMPILE_TEST && !RASPBERRYPI_FIRMWARE) diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index e3f25475d1f04..b72c6a059e4af 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -188,6 +188,7 @@ obj-$(CONFIG_SENSORS_POWERZ) += powerz.o obj-$(CONFIG_SENSORS_POWR1220) += powr1220.o obj-$(CONFIG_SENSORS_PT5161L) += pt5161l.o obj-$(CONFIG_SENSORS_PWM_FAN) += pwm-fan.o +obj-$(CONFIG_SENSORS_QNAP_MCU_HWMON) += qnap-mcu-hwmon.o obj-$(CONFIG_SENSORS_RASPBERRYPI_HWMON) += raspberrypi-hwmon.o obj-$(CONFIG_SENSORS_SBTSI) += sbtsi_temp.o obj-$(CONFIG_SENSORS_SBRMI) += sbrmi.o diff --git a/drivers/hwmon/qnap-mcu-hwmon.c b/drivers/hwmon/qnap-mcu-hwmon.c new file mode 100644 index 0000000000000..c4925ece165e2 --- /dev/null +++ b/drivers/hwmon/qnap-mcu-hwmon.c @@ -0,0 +1,352 @@ +// SPDX-License-Identifier: GPL-2.0-only + +/* + * Driver for hwmon elements found on QNAP-MCU devices + * + * Copyright (C) 2024 Heiko Stuebner + */ + +#include +#include +#include +#include +#include +#include + +struct qnap_mcu_hwmon { + struct qnap_mcu *mcu; + struct device *dev; + + unsigned int pwm_min; + unsigned int pwm_max; + + unsigned int pwm_value; + bool pwm_enabled; + + unsigned int fan_state; + unsigned int fan_max_state; + unsigned int *fan_cooling_levels; + + struct thermal_cooling_device *cdev; + struct hwmon_chip_info info; +}; + +static int qnap_mcu_hwmon_get_rpm(struct qnap_mcu_hwmon *hwm) +{ + u8 cmd[] = { + [0] = 0x40, /* @ */ + [1] = 0x46, /* F */ + [2] = 0x41 /* A */ + }; + u8 reply[6]; + int ret; + + /* poll the fan rpm */ + ret = qnap_mcu_exec(hwm->mcu, cmd, sizeof(cmd), reply, sizeof(reply)); + if (ret) + return ret; + + /* First 2 bytes must mirror the sent command */ + if (memcmp(cmd, reply, 2)) { + dev_err(hwm->dev, "malformed data received\n"); + return -EIO; + } + + return reply[4] * 450; +} + +static int qnap_mcu_hwmon_update_fan(struct qnap_mcu_hwmon *hwm) +{ + u8 cmd[] = { + [0] = 0x40, /* @ */ + [1] = 0x46, /* F */ + [2] = 0x57, /* W */ + [3] = 0x30, /* 0 ... fan-id? */ + [4] = hwm->pwm_enabled ? hwm->pwm_value : 0 + }; + + /* poll the fan rpm */ + return qnap_mcu_exec_with_ack(hwm->mcu, cmd, sizeof(cmd)); +} + +static int qnap_mcu_hwmon_get_temp(struct qnap_mcu_hwmon *hwm) +{ + u8 cmd[] = { + [0] = 0x40, /* @ */ + [1] = 0x54, /* T */ + [2] = 0x33 /* 3 */ + }; + u8 reply[4]; + int ret; + + /* poll the fan rpm */ + ret = qnap_mcu_exec(hwm->mcu, cmd, sizeof(cmd), reply, sizeof(reply)); + if (ret) + return ret; + + /* First bytes must mirror the sent command */ + if (memcmp(cmd, reply, sizeof(cmd))) { + dev_err(hwm->dev, "malformed data received\n"); + return -EIO; + } + + /* + * There is an unknown bit set in bit7. + * Bits [6:0] report the actual temperature as returned by the + * original qnap firmware-tools, so just drop bit7 for now. + */ + return reply[3] & 0x7f; +} + +static int qnap_mcu_hwmon_write(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, long val) +{ + struct qnap_mcu_hwmon *hwm = dev_get_drvdata(dev); + + switch (attr) { + case hwmon_pwm_input: + if (val < hwm->pwm_min || val > hwm->pwm_max) + return -EINVAL; + + hwm->pwm_value = val; + return qnap_mcu_hwmon_update_fan(hwm); + case hwmon_pwm_enable: + if (val < 0 || val > 1) + return -EINVAL; + + hwm->pwm_enabled = val; + return qnap_mcu_hwmon_update_fan(hwm); + default: + return -EOPNOTSUPP; + } + + return 0; +} + +static int qnap_mcu_hwmon_read(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, long *val) +{ + struct qnap_mcu_hwmon *hwm = dev_get_drvdata(dev); + + switch (type) { + case hwmon_pwm: + switch (attr) { + case hwmon_pwm_input: + *val = hwm->pwm_value; + return 0; + case hwmon_pwm_enable: + *val = hwm->pwm_enabled; + return 0; + } + return -EOPNOTSUPP; + case hwmon_fan: + *val = qnap_mcu_hwmon_get_rpm(hwm); + return 0; + case hwmon_temp: + *val = qnap_mcu_hwmon_get_temp(hwm); + return 0; + default: + return -EOPNOTSUPP; + } +} + +static umode_t qnap_mcu_hwmon_is_visible(const void *data, + enum hwmon_sensor_types type, + u32 attr, int channel) +{ + switch (type) { + case hwmon_temp: + return 0444; + + case hwmon_pwm: + return 0644; + + case hwmon_fan: + return 0444; + + default: + return 0; + } +} + +static const struct hwmon_ops qnap_mcu_hwmon_hwmon_ops = { + .is_visible = qnap_mcu_hwmon_is_visible, + .read = qnap_mcu_hwmon_read, + .write = qnap_mcu_hwmon_write, +}; + +/* thermal cooling device callbacks */ +static int qnap_mcu_hwmon_get_max_state(struct thermal_cooling_device *cdev, + unsigned long *state) +{ + struct qnap_mcu_hwmon *hwm = cdev->devdata; + + if (!hwm) + return -EINVAL; + + *state = hwm->fan_max_state; + + return 0; +} + +static int qnap_mcu_hwmon_get_cur_state(struct thermal_cooling_device *cdev, + unsigned long *state) +{ + struct qnap_mcu_hwmon *hwm = cdev->devdata; + + if (!hwm) + return -EINVAL; + + *state = hwm->fan_state; + + return 0; +} + +static int qnap_mcu_hwmon_set_cur_state(struct thermal_cooling_device *cdev, + unsigned long state) +{ + struct qnap_mcu_hwmon *hwm = cdev->devdata; + int ret; + + if (!hwm || (state > hwm->fan_max_state)) + return -EINVAL; + + if (state == hwm->fan_state) + return 0; + + if (hwm->fan_cooling_levels[state]) { + hwm->pwm_enabled = 1; + hwm->pwm_value = hwm->fan_cooling_levels[state]; + } else { + hwm->pwm_enabled = 0; + } + + ret = qnap_mcu_hwmon_update_fan(hwm); + if (ret) + return ret; + + hwm->fan_state = state; + + return ret; +} + +static const struct thermal_cooling_device_ops qnap_mcu_hwmon_cooling_ops = { + .get_max_state = qnap_mcu_hwmon_get_max_state, + .get_cur_state = qnap_mcu_hwmon_get_cur_state, + .set_cur_state = qnap_mcu_hwmon_set_cur_state, +}; + +static int qnap_mcu_hwmon_get_cooling_data(struct device *dev, struct qnap_mcu_hwmon *hwm) +{ + int num, i, ret; + + if (!device_property_present(dev->parent, "cooling-levels")) + return 0; + + ret = device_property_count_u32(dev->parent, "cooling-levels"); + if (ret <= 0) { + dev_err(dev, "Wrong data!\n"); + return ret ? : -EINVAL; + } + + num = ret; + hwm->fan_cooling_levels = devm_kcalloc(dev, num, sizeof(u32), + GFP_KERNEL); + if (!hwm->fan_cooling_levels) + return -ENOMEM; + + ret = device_property_read_u32_array(dev->parent, "cooling-levels", + hwm->fan_cooling_levels, num); + if (ret) { + dev_err(dev, "Property 'cooling-levels' cannot be read!\n"); + return ret; + } + + for (i = 0; i < num; i++) { + if (hwm->fan_cooling_levels[i] > hwm->pwm_max) { + dev_err(dev, "fan state[%d]:%d > %d\n", i, + hwm->fan_cooling_levels[i], hwm->pwm_max); + return -EINVAL; + } + } + + hwm->fan_max_state = num - 1; + + return 0; +} + +static const struct hwmon_channel_info * const qnap_mcu_hwmon_channels[] = { + HWMON_CHANNEL_INFO(pwm, HWMON_PWM_INPUT | HWMON_PWM_ENABLE), + HWMON_CHANNEL_INFO(fan, HWMON_F_INPUT), + HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT), + NULL +}; + +static int qnap_mcu_hwmon_probe(struct platform_device *pdev) +{ + struct qnap_mcu *mcu = dev_get_drvdata(pdev->dev.parent); + const struct qnap_mcu_variant *variant = qnap_mcu_get_variant_data(mcu); + struct qnap_mcu_hwmon *hwm; + struct thermal_cooling_device *cdev; + struct device *dev = &pdev->dev; + struct device *hwmon; + int ret; + + hwm = devm_kzalloc(dev, sizeof(*hwm), GFP_KERNEL); + if (!hwm) + return -ENOMEM; + + hwm->mcu = mcu; + hwm->dev = &pdev->dev; + hwm->pwm_min = variant->fan_pwm_min; + hwm->pwm_max = variant->fan_pwm_max; + + platform_set_drvdata(pdev, hwm); + + /* + * Set duty cycle to maximum allowed and enable PWM output as well as + * the regulator. In case of error nothing is changed + */ + hwm->pwm_value = hwm->pwm_max; + hwm->pwm_enabled = 1; + qnap_mcu_hwmon_update_fan(hwm); + + hwm->info.ops = &qnap_mcu_hwmon_hwmon_ops; + hwm->info.info = qnap_mcu_hwmon_channels; + + hwmon = devm_hwmon_device_register_with_info(dev, "qnapmcu", + hwm, &hwm->info, NULL); + if (IS_ERR(hwmon)) + return dev_err_probe(dev, PTR_ERR(hwmon), "Failed to register hwmon device\n"); + + ret = qnap_mcu_hwmon_get_cooling_data(dev, hwm); + if (ret) + return ret; + + hwm->fan_state = hwm->fan_max_state; + + if (IS_ENABLED(CONFIG_THERMAL)) { + cdev = devm_thermal_of_cooling_device_register(dev, + dev->parent->of_node, "qnap-mcu-hwmon", + hwm, &qnap_mcu_hwmon_cooling_ops); + if (IS_ERR(cdev)) + return dev_err_probe(dev, PTR_ERR(cdev), + "Failed to register qnap-mcu-hwmon as cooling device\n"); + hwm->cdev = cdev; + } + + return 0; +} + +static struct platform_driver qnap_mcu_hwmon_driver = { + .probe = qnap_mcu_hwmon_probe, + .driver = { + .name = "qnap-mcu-hwmon", + }, +}; +module_platform_driver(qnap_mcu_hwmon_driver); + +MODULE_ALIAS("platform:qnap-mcu-hwmon"); +MODULE_AUTHOR("Heiko Stuebner "); +MODULE_DESCRIPTION("QNAP MCU hwmon driver"); +MODULE_LICENSE("GPL");