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waterforce.c
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// SPDX-License-Identifier: GPL-2.0+
/*
* hwmon driver for Gigabyte AORUS Waterforce AIO coolers
*
* Copyright 2023 Aleksa Savic <[email protected]>
*/
#include <linux/debugfs.h>
#include <linux/hid.h>
#include <linux/hwmon.h>
#include <linux/jiffies.h>
#include <linux/module.h>
#include <asm/unaligned.h>
#define DRIVER_NAME "waterforce"
#define USB_VENDOR_ID_GIGABYTE 0x1044
#define USB_PRODUCT_ID_WATERFORCE_1 0x7a4d /* Gigabyte AORUS WATERFORCE X (240, 280, 360) */
#define USB_PRODUCT_ID_WATERFORCE_2 0x7a52 /* Gigabyte AORUS WATERFORCE X 360G */
#define USB_PRODUCT_ID_WATERFORCE_3 0x7a53 /* Gigabyte AORUS WATERFORCE EX 360 */
#define STATUS_VALIDITY 2 /* seconds */
#define MAX_REPORT_LENGTH 6144
#define FIRMWARE_F14_VER 14
#define MIN_FAN_RPM 750
#define LOWER_MAX_RPM 2800
#define DEFAULT_MAX_RPM 3200
#define WATERFORCE_TEMP_SENSOR 0xD
#define WATERFORCE_FAN_SPEED 0x02
#define WATERFORCE_PUMP_SPEED 0x05
#define WATERFORCE_FAN_DUTY 0x08
#define WATERFORCE_PUMP_DUTY 0x09
DECLARE_COMPLETION(status_report_received);
/* Control commands, inner offsets and lengths */
static const u8 get_status_cmd[] = { 0x99, 0xDA };
#define FIRMWARE_VER_START_OFFSET_1 2
#define FIRMWARE_VER_START_OFFSET_2 3
static const u8 get_firmware_ver_cmd[] = { 0x99, 0xD6 };
/* Offset in below command where CPU temp value should be set */
#define SET_CPU_TEMP_CMD_OFFSET 3
/* Sample command portraying 16c/32t, 5.5GHz CPU */
static const u8 set_cpu_temp_cmd_template[] = { 0x99, 0xE0, 0, 0, 0x20, 0x05, 0x05, 0x10, 0x30 };
/* Offset in below command where channel (pump or fan) should be set and their values */
#define SET_RPM_SPEED_CHANNEL_OFFSET 2
#define SET_RPM_SPEED_CHANNEL_FAN 0x0101
#define SET_RPM_SPEED_CHANNEL_PUMP 0x0402
/* Offsets in below command where RPM should be set */
static const u8 speed_cmd_offsets[] = { 5, 8, 11, 14 };
static const u8 set_rpm_speed_cmd_template[] = {
0x99, 0xE6, 0, 0, 0, 0, 0, 0x1E, 0, 0, 0x32, 0, 0, 0x41, 0, 0
};
#define GET_STATUS_CMD_LENGTH 2
#define GET_FIRMWARE_VER_CMD_LENGTH 2
#define SET_CPU_TEMP_CMD_LENGTH 9
#define SET_RPM_SPEED_OFFSETS_LENGTH 4
#define SET_RPM_SPEED_CMD_LENGTH 16
static const char *const waterforce_temp_label[] = {
"Coolant temp",
"User provided CPU temp"
};
static const char *const waterforce_speed_label[] = {
"Fan speed",
"Pump speed"
};
struct waterforce_data {
struct hid_device *hdev;
struct device *hwmon_dev;
struct dentry *debugfs;
struct mutex buffer_lock; /* For locking access to buffer */
struct completion fw_version_processed;
/* Sensor data */
s32 temp_input[1];
u16 speed_input[2]; /* Fan and pump speed in RPM */
u8 duty_input[2]; /* Fan and pump duty in 0-100% */
u8 *buffer;
int firmware_version;
int max_speed_rpm;
unsigned long updated; /* jiffies */
};
/*
* Writes the command to the device with the rest of the report (up to 64 bytes) filled
* with zeroes
*/
static int waterforce_write_expanded(struct waterforce_data *priv, const u8 *cmd, int cmd_length)
{
int ret;
mutex_lock(&priv->buffer_lock);
memset(priv->buffer, 0x00, MAX_REPORT_LENGTH);
memcpy(priv->buffer, cmd, cmd_length);
ret = hid_hw_output_report(priv->hdev, priv->buffer, MAX_REPORT_LENGTH);
mutex_unlock(&priv->buffer_lock);
return ret;
}
static int waterforce_get_status(struct waterforce_data *priv)
{
int ret;
reinit_completion(&status_report_received);
/* Send command for getting status */
ret = waterforce_write_expanded(priv, get_status_cmd, GET_STATUS_CMD_LENGTH);
if (ret < 0)
return ret;
if (!wait_for_completion_timeout
(&status_report_received, msecs_to_jiffies(STATUS_VALIDITY * 1000)))
return -ENODATA;
return 0;
}
static umode_t waterforce_is_visible(const void *data,
enum hwmon_sensor_types type, u32 attr, int channel)
{
switch (type) {
case hwmon_temp:
switch (attr) {
case hwmon_temp_label:
return 0444;
case hwmon_temp_input:
/* Special case to enable writing custom temp value to device, write only */
if (channel == 1)
return 0200;
return 0444;
default:
break;
}
break;
case hwmon_fan:
switch (attr) {
case hwmon_fan_label:
case hwmon_fan_input:
return 0444;
case hwmon_fan_target:
return 0200;
default:
break;
}
break;
case hwmon_pwm:
switch (attr) {
case hwmon_pwm_input:
return 0444;
default:
break;
}
break;
default:
break;
}
return 0;
}
static int waterforce_read(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long *val)
{
int ret;
struct waterforce_data *priv = dev_get_drvdata(dev);
if (time_after(jiffies, priv->updated + STATUS_VALIDITY * HZ)) {
/* Request status on demand */
ret = waterforce_get_status(priv);
if (ret < 0)
return -ENODATA;
}
switch (type) {
case hwmon_temp:
*val = priv->temp_input[channel];
break;
case hwmon_fan:
*val = priv->speed_input[channel];
break;
case hwmon_pwm:
switch (attr) {
case hwmon_pwm_input:
*val = DIV_ROUND_CLOSEST(priv->duty_input[channel] * 255, 100);
break;
default:
break;
}
break;
default:
return -EOPNOTSUPP; /* unreachable */
}
return 0;
}
static int waterforce_read_string(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, const char **str)
{
switch (type) {
case hwmon_temp:
*str = waterforce_temp_label[channel];
break;
case hwmon_fan:
*str = waterforce_speed_label[channel];
break;
default:
return -EOPNOTSUPP; /* unreachable */
}
return 0;
}
static int waterforce_get_fw_ver(struct hid_device *hdev)
{
int ret;
struct waterforce_data *priv = hid_get_drvdata(hdev);
ret = waterforce_write_expanded(priv, get_firmware_ver_cmd, GET_FIRMWARE_VER_CMD_LENGTH);
if (ret < 0)
return ret;
if (!wait_for_completion_timeout
(&priv->fw_version_processed, msecs_to_jiffies(STATUS_VALIDITY * 1000)))
return -ENODATA;
return 0;
}
static int waterforce_set_cpu_temp(struct waterforce_data *priv, long val)
{
int ret;
u8 set_cpu_temp_cmd[SET_CPU_TEMP_CMD_LENGTH];
if (val < 0 || val > 255)
return -EINVAL;
memcpy(set_cpu_temp_cmd, set_cpu_temp_cmd_template, SET_CPU_TEMP_CMD_LENGTH);
set_cpu_temp_cmd[SET_CPU_TEMP_CMD_OFFSET] = val;
ret = waterforce_write_expanded(priv, set_cpu_temp_cmd, SET_CPU_TEMP_CMD_LENGTH);
if (ret < 0)
return ret;
return 0;
}
static int waterforce_set_fan_speed(struct waterforce_data *priv, int channel, long val)
{
int i, ret;
u8 set_rpm_speed_cmd[SET_RPM_SPEED_CMD_LENGTH];
if (val < MIN_FAN_RPM || val > priv->max_speed_rpm)
return -EINVAL;
memcpy(set_rpm_speed_cmd, set_rpm_speed_cmd_template, SET_RPM_SPEED_CMD_LENGTH);
set_rpm_speed_cmd[SET_RPM_SPEED_CHANNEL_OFFSET+1] =
channel == 0 ? SET_RPM_SPEED_CHANNEL_FAN%256 : SET_RPM_SPEED_CHANNEL_PUMP%256;
set_rpm_speed_cmd[SET_RPM_SPEED_CHANNEL_OFFSET] =
channel == 0 ? SET_RPM_SPEED_CHANNEL_FAN/256 : SET_RPM_SPEED_CHANNEL_PUMP/256;
for (i = 0; i < SET_RPM_SPEED_OFFSETS_LENGTH; i++)
put_unaligned_be16(val, set_rpm_speed_cmd + speed_cmd_offsets[i]);
ret = waterforce_write_expanded(priv, set_rpm_speed_cmd, SET_RPM_SPEED_CMD_LENGTH);
if (ret < 0)
return ret;
return 0;
}
static int waterforce_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel,
long val)
{
struct waterforce_data *priv = dev_get_drvdata(dev);
switch (type) {
case hwmon_temp:
switch (attr) {
case hwmon_temp_input:
return waterforce_set_cpu_temp(priv, val);
default:
break;
}
break;
case hwmon_fan:
switch (attr) {
case hwmon_fan_target:
return waterforce_set_fan_speed(priv, channel, val);
default:
break;
}
break;
default:
return -EOPNOTSUPP;
}
return 0;
}
static const struct hwmon_ops waterforce_hwmon_ops = {
.is_visible = waterforce_is_visible,
.read = waterforce_read,
.read_string = waterforce_read_string,
.write = waterforce_write
};
static const struct hwmon_channel_info *waterforce_info[] = {
HWMON_CHANNEL_INFO(temp,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL),
HWMON_CHANNEL_INFO(fan,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_TARGET,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_TARGET),
HWMON_CHANNEL_INFO(pwm,
HWMON_PWM_INPUT,
HWMON_PWM_INPUT),
NULL
};
static const struct hwmon_chip_info waterforce_chip_info = {
.ops = &waterforce_hwmon_ops,
.info = waterforce_info,
};
static int waterforce_raw_event(struct hid_device *hdev, struct hid_report *report, u8 *data,
int size)
{
struct waterforce_data *priv = hid_get_drvdata(hdev);
if (data[0] == get_firmware_ver_cmd[0] && data[1] == get_firmware_ver_cmd[1]) {
/* Received a firmware version report */
priv->firmware_version =
data[FIRMWARE_VER_START_OFFSET_1] * 10 + data[FIRMWARE_VER_START_OFFSET_2];
complete(&priv->fw_version_processed);
return 0;
}
if (data[0] != get_status_cmd[0] || data[1] != get_status_cmd[1]) {
/* Device returned improper data */
hid_err_once(priv->hdev, "firmware or device is possibly damaged\n");
return 0;
}
priv->temp_input[0] = data[WATERFORCE_TEMP_SENSOR] * 1000;
priv->speed_input[0] = get_unaligned_le16(data + WATERFORCE_FAN_SPEED);
priv->speed_input[1] = get_unaligned_le16(data + WATERFORCE_PUMP_SPEED);
priv->duty_input[0] = data[WATERFORCE_FAN_DUTY];
priv->duty_input[1] = data[WATERFORCE_PUMP_DUTY];
complete(&status_report_received);
priv->updated = jiffies;
return 0;
}
#ifdef CONFIG_DEBUG_FS
static int firmware_version_show(struct seq_file *seqf, void *unused)
{
struct waterforce_data *priv = seqf->private;
seq_printf(seqf, "%u\n", priv->firmware_version);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(firmware_version);
static void waterforce_debugfs_init(struct waterforce_data *priv)
{
char name[64];
scnprintf(name, sizeof(name), "%s-%s", DRIVER_NAME, dev_name(&priv->hdev->dev));
priv->debugfs = debugfs_create_dir(name, NULL);
debugfs_create_file("firmware_version", 0444, priv->debugfs, priv, &firmware_version_fops);
}
#else
static void waterforce_debugfs_init(struct waterforce_data *priv)
{
}
#endif
static int waterforce_probe(struct hid_device *hdev, const struct hid_device_id *id)
{
struct waterforce_data *priv;
int ret;
priv = devm_kzalloc(&hdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->hdev = hdev;
hid_set_drvdata(hdev, priv);
/*
* Initialize ->updated to STATUS_VALIDITY seconds in the past, making
* the initial empty data invalid for waterforce_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->buffer = devm_kzalloc(&hdev->dev, MAX_REPORT_LENGTH, GFP_KERNEL);
if (!priv->buffer) {
ret = -ENOMEM;
goto fail_and_close;
}
mutex_init(&priv->buffer_lock);
init_completion(&priv->fw_version_processed);
priv->hwmon_dev = hwmon_device_register_with_info(&hdev->dev, "waterforce",
priv, &waterforce_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;
}
hid_device_io_start(hdev);
ret = waterforce_get_fw_ver(hdev);
if (ret < 0) {
hid_err(hdev, "fw version request failed with %d\n", ret);
goto fail_and_close;
}
hid_device_io_stop(hdev);
if (priv->firmware_version != FIRMWARE_F14_VER &&
hdev->product != USB_PRODUCT_ID_WATERFORCE_3)
priv->max_speed_rpm = LOWER_MAX_RPM;
else
priv->max_speed_rpm = DEFAULT_MAX_RPM;
waterforce_debugfs_init(priv);
return 0;
fail_and_close:
hid_hw_close(hdev);
fail_and_stop:
hid_hw_stop(hdev);
return ret;
}
static void waterforce_remove(struct hid_device *hdev)
{
struct waterforce_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 waterforce_table[] = {
{ HID_USB_DEVICE(USB_VENDOR_ID_GIGABYTE, USB_PRODUCT_ID_WATERFORCE_1) },
{ HID_USB_DEVICE(USB_VENDOR_ID_GIGABYTE, USB_PRODUCT_ID_WATERFORCE_2) },
{ HID_USB_DEVICE(USB_VENDOR_ID_GIGABYTE, USB_PRODUCT_ID_WATERFORCE_3) },
{ }
};
MODULE_DEVICE_TABLE(hid, waterforce_table);
static struct hid_driver waterforce_driver = {
.name = "waterforce",
.id_table = waterforce_table,
.probe = waterforce_probe,
.remove = waterforce_remove,
.raw_event = waterforce_raw_event,
};
static int __init waterforce_init(void)
{
return hid_register_driver(&waterforce_driver);
}
static void __exit waterforce_exit(void)
{
hid_unregister_driver(&waterforce_driver);
}
/*
* When compiled into the kernel, initialize after the hid bus.
*/
late_initcall(waterforce_init);
module_exit(waterforce_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Aleksa Savic <[email protected]>");
MODULE_DESCRIPTION("Hwmon driver for Gigabyte AORUS Waterforce AIO coolers");