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teensyloopctrl.c
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teensyloopctrl.c
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// SPDX-License-Identifier: GPL-2.0+
/*
* teensyloopctrl.c - hwmon driver for the Teensy Fan Controller
*
* Originally:
* liquidctl.c - hwmon driver for the NZXT Smart Device and Grid+ V3
*
* Copyright 2019 Jonas Malaco <jonas@protocubo.io>
*/
#include <linux/hid.h>
#include <linux/hwmon.h>
#include <linux/kernel.h>
#include <linux/module.h>
#define DRVNAME "teensyloopctrl"
#define MAX_REPORT_SIZE 65
struct tloopctrl_device_data {
struct hid_device *hid_dev;
struct device *hwmon_dev;
int temp_count;
int fan_count;
int pwm_count;
const char *const *temp_label;
const char *const *fan_label;
// const char *const *pwm_label;
u64 *temp_input;
long *fan_input;
u64 *pwm_input;
u8 *buf;
};
static umode_t tloopctrl_is_visible(const void *data,
enum hwmon_sensor_types type,
u32 attr, int channel) {
struct tloopctrl_device_data *ldata;
struct hid_device *hdev;
ldata = (struct tloopctrl_device_data *)data;
hdev = ldata->hid_dev;
if (hdev->dev_rsize < 10 || hdev->dev_rdesc[1] != 0xAB || hdev->dev_rdesc[2] != 0xFF || hdev->dev_rdesc[4] != 0x00 || hdev->dev_rdesc[5] != 0x02) {
// printk(KERN_WARNING "tloopctrl_is_visible() return: 0");
return 0;
}
else {
return S_IRUGO;
}
}
static int tloopctrl_read(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long *val) {
struct tloopctrl_device_data *ldata = dev_get_drvdata(dev);
switch (type) {
case hwmon_temp:
if (attr != hwmon_temp_input || channel >= ldata->temp_count)
return -EINVAL;
*val = (int)ldata->temp_input[channel];
break;
case hwmon_fan:
if (attr != hwmon_fan_input || channel >= ldata->fan_count)
return -EINVAL;
*val = ldata->fan_input[channel];
break;
case hwmon_pwm:
if (attr != hwmon_pwm_input || channel >= ldata->pwm_count)
return -EINVAL;
*val = (int)ldata->pwm_input[channel];
break;
default:
return -EINVAL;
}
return 0;
}
static int tloopctrl_read_string(struct device *dev,
enum hwmon_sensor_types type, u32 attr,
int channel, const char **str) {
struct tloopctrl_device_data *ldata = dev_get_drvdata(dev);
switch (type) {
case hwmon_temp:
if (attr != hwmon_temp_label || channel >= ldata->temp_count ||
!ldata->temp_label[channel])
return -EINVAL;
*str = ldata->temp_label[channel];
break;
case hwmon_fan:
if (attr != hwmon_fan_label || channel >= ldata->fan_count ||
!ldata->fan_label[channel])
return -EINVAL;
*str = ldata->fan_label[channel];
break;
// case hwmon_pwm:
// if (attr != hwmon_pwm_label || channel >= ldata->pwm_count ||
// !ldata->pwm_label[channel])
// return -EINVAL;
// *str = ldata->pwm_label[channel];
// break;
default:
return -EINVAL;
}
return 0;
}
static const struct hwmon_ops tloopctrl_hwmon_ops = {
.is_visible = tloopctrl_is_visible,
.read = tloopctrl_read,
.read_string = tloopctrl_read_string,
};
#define DEVNAME_TLOOPCTRL_DEVICE "teensyloopctrl"
#define TLOOPCTRL_DEVICE_TEMP_COUNT 7
#define TLOOPCTRL_DEVICE_FAN_COUNT 6
#define TLOOPCTRL_DEVICE_PWM_COUNT 1
static const u32 tloopctrl_device_fan_config[] = {
HWMON_F_INPUT,
HWMON_F_INPUT,
HWMON_F_INPUT,
HWMON_F_INPUT,
HWMON_F_INPUT,
HWMON_F_INPUT,
0
};
static const struct hwmon_channel_info tloopctrl_device_fan = {
.type = hwmon_fan,
.config = tloopctrl_device_fan_config,
};
static const u32 tloopctrl_device_temp_config[] = {
HWMON_T_INPUT,
HWMON_T_INPUT,
HWMON_T_INPUT,
HWMON_T_INPUT,
HWMON_T_INPUT,
HWMON_T_INPUT,
HWMON_T_INPUT,
0
};
static const struct hwmon_channel_info tloopctrl_device_temp = {
.type = hwmon_temp,
.config = tloopctrl_device_temp_config,
};
static const u32 tloopctrl_device_pwm_config[] = {
HWMON_PWM_INPUT,
0
};
static const struct hwmon_channel_info tloopctrl_device_pwm = {
.type = hwmon_pwm,
.config = tloopctrl_device_pwm_config,
};
static const struct hwmon_channel_info *tloopctrl_device_info[] = {
&tloopctrl_device_fan,
&tloopctrl_device_temp,
&tloopctrl_device_pwm,
NULL
};
static const struct hwmon_chip_info tloopctrl_device_chip_info = {
.ops = &tloopctrl_hwmon_ops,
.info = tloopctrl_device_info,
};
#define USB_VENDOR_ID_ARDUINO 0x16C0
#define USB_DEVICE_ID_TLOOPCTRL_DEVICE 0x0486
// TODO
#define STATUS_REPORT_ID 4
#define STATUS_MIN_BYTES 16
#define show_ctx() \
printk(KERN_DEBUG "%s:%d: irq: %lu, serving_softirq: %lu, nmi: %lu, task: %u\n", \
__FUNCTION__, __LINE__, in_irq(), in_serving_softirq(), in_nmi(), in_task());
static int tloopctrl_raw_event(struct hid_device *hdev,
struct hid_report *report, u8 *data, int size) {
struct tloopctrl_device_data *ldata;
/* TODO show_ctx(): in hard irq, how much should we do here? */
if (size <= 0 || report->maxfield != 1 || report->field[0]->application != 0xFFAB0200)
return 0;
ldata = hid_get_drvdata(hdev);
/* TODO reads don't need the latest data, but each store must be atomic */
switch (hdev->product) {
case USB_DEVICE_ID_TLOOPCTRL_DEVICE:
if (data[0] == 0xDA) {
ldata->temp_input[0] = le64_to_cpup((__le64 *) (data + 2)); // supplyTemp
ldata->temp_input[1] = le64_to_cpup((__le64 *) (data + 6)); // returnTemp
ldata->temp_input[2] = le64_to_cpup((__le64 *) (data + 10)); // caseTemp
ldata->temp_input[3] = le64_to_cpup((__le64 *) (data + 14)); // aux1Temp
ldata->temp_input[4] = le64_to_cpup((__le64 *) (data + 18)); // aux2Temp
ldata->temp_input[5] = le64_to_cpup((__le64 *) (data + 22)); // deltaT
// ldata->temp_input[5] = le64_to_cpup((__le64 *) (data + 26)); //
ldata->temp_input[6] = le64_to_cpup((__le64 *) (data + 30)); // setpoint
ldata->fan_input[0] = le16_to_cpup((__le16 *) (data + 34)); // rpm1
ldata->fan_input[1] = le16_to_cpup((__le16 *) (data + 39)); // rpm2
ldata->fan_input[2] = le16_to_cpup((__le16 *) (data + 44)); // rpm3
ldata->fan_input[3] = le16_to_cpup((__le16 *) (data + 49)); // rpm4
ldata->fan_input[4] = le16_to_cpup((__le16 *) (data + 54)); // rpm5
ldata->fan_input[5] = le16_to_cpup((__le16 *) (data + 59)); // rpm6
ldata->pwm_input[0] = 0;
// ldata->pwm_input[0] = le64_to_cpup((__le64 *) (data + 26)); // fan % (PID)
// ldata->pwm_input[0] = le64_to_cpup((__le64 *) (data + 26)); // fan % (%-tbl)
}
break;
default:
return 0;
}
return 0;
}
static int tloopctrl_initialize(struct tloopctrl_device_data *ldata) {
// TODO
int ret;
memset(ldata->buf, '\0', MAX_REPORT_SIZE);
*(ldata->buf) = 0; // report id ?
*(ldata->buf + 1) = 0; //0xC0;
*(ldata->buf + 2) = 0; //0xFF;
ret = hid_hw_output_report(ldata->hid_dev, ldata->buf, MAX_REPORT_SIZE);
//printk(KERN_WARNING "tloopctrl_initialize() ret: %d", ret);
if (ret < 0)
return ret;
if (ret != MAX_REPORT_SIZE)
return -EINVAL;
return 0;
}
static const struct hid_device_id tloopctrl_table[] = {
{HID_USB_DEVICE(USB_VENDOR_ID_ARDUINO, USB_DEVICE_ID_TLOOPCTRL_DEVICE)},
{}
};
MODULE_DEVICE_TABLE(hid, tloopctrl_table
);
static int tloopctrl_probe(struct hid_device *hdev,
const struct hid_device_id *id) {
struct tloopctrl_device_data *ldata;
struct device *hwmon_dev;
const struct hwmon_chip_info *chip_info;
char *chip_name;
int ret;
ldata = devm_kzalloc(&hdev->dev, sizeof(*ldata), GFP_KERNEL);
if (!ldata)
return -ENOMEM;
switch (hdev->product) {
case USB_DEVICE_ID_TLOOPCTRL_DEVICE:
chip_name = DEVNAME_TLOOPCTRL_DEVICE;
ldata->temp_count = TLOOPCTRL_DEVICE_TEMP_COUNT;
ldata->fan_count = TLOOPCTRL_DEVICE_FAN_COUNT;
ldata->pwm_count = TLOOPCTRL_DEVICE_PWM_COUNT;
ldata->temp_label = NULL;
ldata->fan_label = NULL;
// ldata->pwm_label = NULL;
chip_info = &tloopctrl_device_chip_info;
break;
default:
return -EINVAL;
}
hid_info(hdev, "device: %s\n", chip_name);
ldata->buf = devm_kmalloc(&hdev->dev, MAX_REPORT_SIZE, GFP_KERNEL);
if (!ldata->buf)
return -ENOMEM;
ldata->temp_input = devm_kcalloc(&hdev->dev, ldata->temp_count,
sizeof(*ldata->temp_input), GFP_KERNEL);
if (!ldata->temp_input)
return -ENOMEM;
ldata->fan_input = devm_kcalloc(&hdev->dev, ldata->fan_count,
sizeof(*ldata->fan_input), GFP_KERNEL);
if (!ldata->fan_input)
return -ENOMEM;
ldata->pwm_input = devm_kcalloc(&hdev->dev, ldata->pwm_count,
sizeof(*ldata->pwm_input), GFP_KERNEL);
if (!ldata->pwm_input)
return -ENOMEM;
ldata->hid_dev = hdev;
hid_set_drvdata(hdev, ldata);
ret = hid_parse(hdev);
if (ret) {
hid_err(hdev, "hid_parse failed with %d\n", ret);
return ret;
}
/* keep hidraw so user-space can (easily) take care of the other
* features of the device (e.g. LEDs) */
ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW);
if (ret) {
hid_err(hdev, "hid_hw_start failed with %d\n", ret);
goto rec_stop_hid;
}
ret = hid_hw_open(hdev);
if (ret) {
hid_err(hdev, "hid_hw_open failed with %d\n", ret);
goto rec_close_hid;
}
hwmon_dev = devm_hwmon_device_register_with_info(&hdev->dev, chip_name,
ldata, chip_info,
NULL);
if (IS_ERR(hwmon_dev)) {
hid_err(hdev, "failed to register hwmon device\n");
ret = PTR_ERR(hwmon_dev);
goto rec_close_hid;
}
ldata->hwmon_dev = hwmon_dev;
ret = tloopctrl_initialize(ldata);
if (ret) {
hid_err(hdev, "failed to initialize device");
goto rec_close_hid;
}
hid_info(hdev, "probing successful\n");
return 0;
rec_close_hid:
hid_hw_close(hdev);
rec_stop_hid:
hid_hw_stop(hdev);
return ret;
}
static void tloopctrl_remove(struct hid_device *hdev) {
hid_hw_close(hdev);
hid_hw_stop(hdev);
}
static struct hid_driver tloopctrl_driver = {
.name = DRVNAME,
.id_table = tloopctrl_table,
.probe = tloopctrl_probe,
.remove = tloopctrl_remove,
.raw_event = tloopctrl_raw_event,
};
module_hid_driver(tloopctrl_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jonas Malaco <jonas@protocubo.io>");
MODULE_AUTHOR("Jack Davis <c@jtd.me>");
MODULE_DESCRIPTION("Hwmon driver for Teensy Fan Controller");