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authorJonas Malaco <jonas@protocubo.io>2021-03-19 01:55:44 -0300
committerGuenter Roeck <linux@roeck-us.net>2021-04-20 06:50:14 -0700
commit82e3430dfa8c32f35ce24a5c628e3e221f168769 (patch)
treea35b7ad478d02c4f51fe40583f9732760ba29675 /drivers/hwmon
parentaf9a973040bd5c27dfa1c7b5e970b7cf9238b530 (diff)
downloadlinux-82e3430dfa8c32f35ce24a5c628e3e221f168769.tar.bz2
hwmon: add driver for NZXT Kraken X42/X52/X62/X72
These are "all-in-one" CPU liquid coolers that can be monitored and controlled through a proprietary USB HID protocol. While the models have differently sized radiators and come with varying numbers of fans, they are all indistinguishable at the software level. The driver exposes fan/pump speeds and coolant temperature through the standard hwmon sysfs interface. Fan and pump control, while supported by the devices, are not currently exposed. The firmware accepts up to 61 trip points per channel (fan/pump), but the same set of trip temperatures has to be maintained for both; with pwmX_auto_point_Y_temp attributes, users would need to maintain this invariant themselves. Instead, fan and pump control, as well as LED control (which the device also supports for 9 addressable RGB LEDs on the CPU water block) are left for existing and already mature user-space tools, which can still be used alongside the driver, thanks to hidraw. A link to one, which I also maintain, is provided in the documentation. The implementation is based on USB traffic analysis. It has been runtime tested on x86_64, both as a built-in driver and as a module. Signed-off-by: Jonas Malaco <jonas@protocubo.io> Link: https://lore.kernel.org/r/20210319045544.416138-1-jonas@protocubo.io [groeck: Removed unnecessary spinlock.h include] Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon')
-rw-r--r--drivers/hwmon/Kconfig10
-rw-r--r--drivers/hwmon/Makefile1
-rw-r--r--drivers/hwmon/nzxt-kraken2.c234
3 files changed, 245 insertions, 0 deletions
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 54f04e61fb83..0ddc974b102e 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -1492,6 +1492,16 @@ config SENSORS_NSA320
This driver can also be built as a module. If so, the module
will be called nsa320-hwmon.
+config SENSORS_NZXT_KRAKEN2
+ tristate "NZXT Kraken X42/X51/X62/X72 liquid coolers"
+ depends on USB_HID
+ help
+ If you say yes here you get support for hardware monitoring for the
+ NZXT Kraken X42/X52/X62/X72 all-in-one CPU liquid coolers.
+
+ This driver can also be built as a module. If so, the module
+ will be called nzxt-kraken2.
+
source "drivers/hwmon/occ/Kconfig"
config SENSORS_PCF8591
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index fe38e8a5c979..59e78bc212cf 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -155,6 +155,7 @@ obj-$(CONFIG_SENSORS_NCT7904) += nct7904.o
obj-$(CONFIG_SENSORS_NPCM7XX) += npcm750-pwm-fan.o
obj-$(CONFIG_SENSORS_NSA320) += nsa320-hwmon.o
obj-$(CONFIG_SENSORS_NTC_THERMISTOR) += ntc_thermistor.o
+obj-$(CONFIG_SENSORS_NZXT_KRAKEN2) += nzxt-kraken2.o
obj-$(CONFIG_SENSORS_PC87360) += pc87360.o
obj-$(CONFIG_SENSORS_PC87427) += pc87427.o
obj-$(CONFIG_SENSORS_PCF8591) += pcf8591.o
diff --git a/drivers/hwmon/nzxt-kraken2.c b/drivers/hwmon/nzxt-kraken2.c
new file mode 100644
index 000000000000..89f7ea4f42d4
--- /dev/null
+++ b/drivers/hwmon/nzxt-kraken2.c
@@ -0,0 +1,234 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * nzxt-kraken2.c - hwmon driver for NZXT Kraken X42/X52/X62/X72 coolers
+ *
+ * The device asynchronously sends HID reports (with id 0x04) twice a second to
+ * communicate current fan speed, pump speed and coolant temperature. The
+ * device does not respond to Get_Report requests for this status report.
+ *
+ * Copyright 2019-2021 Jonas Malaco <jonas@protocubo.io>
+ */
+
+#include <asm/unaligned.h>
+#include <linux/hid.h>
+#include <linux/hwmon.h>
+#include <linux/jiffies.h>
+#include <linux/module.h>
+
+#define STATUS_REPORT_ID 0x04
+#define STATUS_VALIDITY 2 /* seconds; equivalent to 4 missed updates */
+
+static const char *const kraken2_temp_label[] = {
+ "Coolant",
+};
+
+static const char *const kraken2_fan_label[] = {
+ "Fan",
+ "Pump",
+};
+
+struct kraken2_priv_data {
+ struct hid_device *hid_dev;
+ struct device *hwmon_dev;
+ s32 temp_input[1];
+ u16 fan_input[2];
+ unsigned long updated; /* jiffies */
+};
+
+static umode_t kraken2_is_visible(const void *data,
+ enum hwmon_sensor_types type,
+ u32 attr, int channel)
+{
+ return 0444;
+}
+
+static int kraken2_read(struct device *dev, enum hwmon_sensor_types type,
+ u32 attr, int channel, long *val)
+{
+ struct kraken2_priv_data *priv = dev_get_drvdata(dev);
+
+ if (time_after(jiffies, priv->updated + STATUS_VALIDITY * HZ))
+ return -ENODATA;
+
+ switch (type) {
+ case hwmon_temp:
+ *val = priv->temp_input[channel];
+ break;
+ case hwmon_fan:
+ *val = priv->fan_input[channel];
+ break;
+ default:
+ return -EOPNOTSUPP; /* unreachable */
+ }
+
+ return 0;
+}
+
+static int kraken2_read_string(struct device *dev, enum hwmon_sensor_types type,
+ u32 attr, int channel, const char **str)
+{
+ switch (type) {
+ case hwmon_temp:
+ *str = kraken2_temp_label[channel];
+ break;
+ case hwmon_fan:
+ *str = kraken2_fan_label[channel];
+ break;
+ default:
+ return -EOPNOTSUPP; /* unreachable */
+ }
+ return 0;
+}
+
+static const struct hwmon_ops kraken2_hwmon_ops = {
+ .is_visible = kraken2_is_visible,
+ .read = kraken2_read,
+ .read_string = kraken2_read_string,
+};
+
+static const struct hwmon_channel_info *kraken2_info[] = {
+ HWMON_CHANNEL_INFO(temp,
+ HWMON_T_INPUT | HWMON_T_LABEL),
+ HWMON_CHANNEL_INFO(fan,
+ HWMON_F_INPUT | HWMON_F_LABEL,
+ HWMON_F_INPUT | HWMON_F_LABEL),
+ NULL
+};
+
+static const struct hwmon_chip_info kraken2_chip_info = {
+ .ops = &kraken2_hwmon_ops,
+ .info = kraken2_info,
+};
+
+static int kraken2_raw_event(struct hid_device *hdev,
+ struct hid_report *report, u8 *data, int size)
+{
+ struct kraken2_priv_data *priv;
+
+ if (size < 7 || report->id != STATUS_REPORT_ID)
+ return 0;
+
+ priv = hid_get_drvdata(hdev);
+
+ /*
+ * The fractional byte of the coolant temperature has been observed to
+ * be in the interval [1,9], but some of these steps are also
+ * consistently skipped for certain integer parts.
+ *
+ * For the lack of a better idea, assume that the resolution is 0.1°C,
+ * and that the missing steps are artifacts of how the firmware
+ * processes the raw sensor data.
+ */
+ priv->temp_input[0] = data[1] * 1000 + data[2] * 100;
+
+ priv->fan_input[0] = get_unaligned_be16(data + 3);
+ priv->fan_input[1] = get_unaligned_be16(data + 5);
+
+ priv->updated = jiffies;
+
+ return 0;
+}
+
+static int kraken2_probe(struct hid_device *hdev,
+ const struct hid_device_id *id)
+{
+ struct kraken2_priv_data *priv;
+ int ret;
+
+ priv = devm_kzalloc(&hdev->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->hid_dev = hdev;
+ hid_set_drvdata(hdev, priv);
+
+ /*
+ * Initialize ->updated to STATUS_VALIDITY seconds in the past, making
+ * the initial empty data invalid for kraken2_read without the need for
+ * a special case there.
+ */
+ priv->updated = jiffies - STATUS_VALIDITY * HZ;
+
+ ret = hid_parse(hdev);
+ if (ret) {
+ hid_err(hdev, "hid parse failed with %d\n", ret);
+ return ret;
+ }
+
+ /*
+ * Enable hidraw so existing user-space tools can continue to work.
+ */
+ ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW);
+ if (ret) {
+ hid_err(hdev, "hid hw start failed with %d\n", ret);
+ goto fail_and_stop;
+ }
+
+ ret = hid_hw_open(hdev);
+ if (ret) {
+ hid_err(hdev, "hid hw open failed with %d\n", ret);
+ goto fail_and_close;
+ }
+
+ priv->hwmon_dev = hwmon_device_register_with_info(&hdev->dev, "kraken2",
+ priv, &kraken2_chip_info,
+ NULL);
+ if (IS_ERR(priv->hwmon_dev)) {
+ ret = PTR_ERR(priv->hwmon_dev);
+ hid_err(hdev, "hwmon registration failed with %d\n", ret);
+ goto fail_and_close;
+ }
+
+ return 0;
+
+fail_and_close:
+ hid_hw_close(hdev);
+fail_and_stop:
+ hid_hw_stop(hdev);
+ return ret;
+}
+
+static void kraken2_remove(struct hid_device *hdev)
+{
+ struct kraken2_priv_data *priv = hid_get_drvdata(hdev);
+
+ hwmon_device_unregister(priv->hwmon_dev);
+
+ hid_hw_close(hdev);
+ hid_hw_stop(hdev);
+}
+
+static const struct hid_device_id kraken2_table[] = {
+ { HID_USB_DEVICE(0x1e71, 0x170e) }, /* NZXT Kraken X42/X52/X62/X72 */
+ { }
+};
+
+MODULE_DEVICE_TABLE(hid, kraken2_table);
+
+static struct hid_driver kraken2_driver = {
+ .name = "nzxt-kraken2",
+ .id_table = kraken2_table,
+ .probe = kraken2_probe,
+ .remove = kraken2_remove,
+ .raw_event = kraken2_raw_event,
+};
+
+static int __init kraken2_init(void)
+{
+ return hid_register_driver(&kraken2_driver);
+}
+
+static void __exit kraken2_exit(void)
+{
+ hid_unregister_driver(&kraken2_driver);
+}
+
+/*
+ * When compiled into the kernel, initialize after the hid bus.
+ */
+late_initcall(kraken2_init);
+module_exit(kraken2_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jonas Malaco <jonas@protocubo.io>");
+MODULE_DESCRIPTION("Hwmon driver for NZXT Kraken X42/X52/X62/X72 coolers");