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Statically allocated array of pointed to hwmon_channel_info can be made const for safety. Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
235 lines
5.4 KiB
C
235 lines
5.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* nzxt-kraken2.c - hwmon driver for NZXT Kraken X42/X52/X62/X72 coolers
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*
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* The device asynchronously sends HID reports (with id 0x04) twice a second to
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* communicate current fan speed, pump speed and coolant temperature. The
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* device does not respond to Get_Report requests for this status report.
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*
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* Copyright 2019-2021 Jonas Malaco <jonas@protocubo.io>
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*/
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#include <asm/unaligned.h>
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#include <linux/hid.h>
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#include <linux/hwmon.h>
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#include <linux/jiffies.h>
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#include <linux/module.h>
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#define STATUS_REPORT_ID 0x04
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#define STATUS_VALIDITY 2 /* seconds; equivalent to 4 missed updates */
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static const char *const kraken2_temp_label[] = {
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"Coolant",
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};
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static const char *const kraken2_fan_label[] = {
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"Fan",
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"Pump",
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};
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struct kraken2_priv_data {
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struct hid_device *hid_dev;
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struct device *hwmon_dev;
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s32 temp_input[1];
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u16 fan_input[2];
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unsigned long updated; /* jiffies */
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};
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static umode_t kraken2_is_visible(const void *data,
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enum hwmon_sensor_types type,
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u32 attr, int channel)
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{
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return 0444;
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}
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static int kraken2_read(struct device *dev, enum hwmon_sensor_types type,
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u32 attr, int channel, long *val)
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{
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struct kraken2_priv_data *priv = dev_get_drvdata(dev);
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if (time_after(jiffies, priv->updated + STATUS_VALIDITY * HZ))
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return -ENODATA;
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switch (type) {
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case hwmon_temp:
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*val = priv->temp_input[channel];
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break;
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case hwmon_fan:
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*val = priv->fan_input[channel];
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break;
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default:
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return -EOPNOTSUPP; /* unreachable */
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}
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return 0;
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}
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static int kraken2_read_string(struct device *dev, enum hwmon_sensor_types type,
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u32 attr, int channel, const char **str)
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{
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switch (type) {
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case hwmon_temp:
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*str = kraken2_temp_label[channel];
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break;
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case hwmon_fan:
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*str = kraken2_fan_label[channel];
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break;
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default:
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return -EOPNOTSUPP; /* unreachable */
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}
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return 0;
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}
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static const struct hwmon_ops kraken2_hwmon_ops = {
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.is_visible = kraken2_is_visible,
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.read = kraken2_read,
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.read_string = kraken2_read_string,
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};
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static const struct hwmon_channel_info * const kraken2_info[] = {
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HWMON_CHANNEL_INFO(temp,
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HWMON_T_INPUT | HWMON_T_LABEL),
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HWMON_CHANNEL_INFO(fan,
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HWMON_F_INPUT | HWMON_F_LABEL,
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HWMON_F_INPUT | HWMON_F_LABEL),
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NULL
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};
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static const struct hwmon_chip_info kraken2_chip_info = {
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.ops = &kraken2_hwmon_ops,
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.info = kraken2_info,
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};
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static int kraken2_raw_event(struct hid_device *hdev,
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struct hid_report *report, u8 *data, int size)
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{
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struct kraken2_priv_data *priv;
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if (size < 7 || report->id != STATUS_REPORT_ID)
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return 0;
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priv = hid_get_drvdata(hdev);
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/*
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* The fractional byte of the coolant temperature has been observed to
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* be in the interval [1,9], but some of these steps are also
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* consistently skipped for certain integer parts.
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*
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* For the lack of a better idea, assume that the resolution is 0.1°C,
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* and that the missing steps are artifacts of how the firmware
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* processes the raw sensor data.
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*/
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priv->temp_input[0] = data[1] * 1000 + data[2] * 100;
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priv->fan_input[0] = get_unaligned_be16(data + 3);
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priv->fan_input[1] = get_unaligned_be16(data + 5);
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priv->updated = jiffies;
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return 0;
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}
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static int kraken2_probe(struct hid_device *hdev,
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const struct hid_device_id *id)
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{
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struct kraken2_priv_data *priv;
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int ret;
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priv = devm_kzalloc(&hdev->dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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priv->hid_dev = hdev;
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hid_set_drvdata(hdev, priv);
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/*
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* Initialize ->updated to STATUS_VALIDITY seconds in the past, making
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* the initial empty data invalid for kraken2_read without the need for
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* a special case there.
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*/
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priv->updated = jiffies - STATUS_VALIDITY * HZ;
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ret = hid_parse(hdev);
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if (ret) {
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hid_err(hdev, "hid parse failed with %d\n", ret);
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return ret;
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}
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/*
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* Enable hidraw so existing user-space tools can continue to work.
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*/
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ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW);
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if (ret) {
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hid_err(hdev, "hid hw start failed with %d\n", ret);
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goto fail_and_stop;
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}
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ret = hid_hw_open(hdev);
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if (ret) {
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hid_err(hdev, "hid hw open failed with %d\n", ret);
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goto fail_and_close;
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}
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priv->hwmon_dev = hwmon_device_register_with_info(&hdev->dev, "kraken2",
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priv, &kraken2_chip_info,
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NULL);
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if (IS_ERR(priv->hwmon_dev)) {
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ret = PTR_ERR(priv->hwmon_dev);
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hid_err(hdev, "hwmon registration failed with %d\n", ret);
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goto fail_and_close;
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}
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return 0;
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fail_and_close:
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hid_hw_close(hdev);
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fail_and_stop:
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hid_hw_stop(hdev);
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return ret;
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}
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static void kraken2_remove(struct hid_device *hdev)
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{
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struct kraken2_priv_data *priv = hid_get_drvdata(hdev);
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hwmon_device_unregister(priv->hwmon_dev);
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hid_hw_close(hdev);
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hid_hw_stop(hdev);
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}
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static const struct hid_device_id kraken2_table[] = {
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{ HID_USB_DEVICE(0x1e71, 0x170e) }, /* NZXT Kraken X42/X52/X62/X72 */
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{ }
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};
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MODULE_DEVICE_TABLE(hid, kraken2_table);
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static struct hid_driver kraken2_driver = {
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.name = "nzxt-kraken2",
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.id_table = kraken2_table,
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.probe = kraken2_probe,
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.remove = kraken2_remove,
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.raw_event = kraken2_raw_event,
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};
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static int __init kraken2_init(void)
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{
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return hid_register_driver(&kraken2_driver);
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}
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static void __exit kraken2_exit(void)
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{
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hid_unregister_driver(&kraken2_driver);
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}
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/*
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* When compiled into the kernel, initialize after the hid bus.
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*/
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late_initcall(kraken2_init);
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module_exit(kraken2_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Jonas Malaco <jonas@protocubo.io>");
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MODULE_DESCRIPTION("Hwmon driver for NZXT Kraken X42/X52/X62/X72 coolers");
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