summaryrefslogtreecommitdiff
path: root/drivers/hwmon/gigabyte_waterforce.c
blob: 27487e215bddff5a4110464868346910a7768b55 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
// SPDX-License-Identifier: GPL-2.0+
/*
 * hwmon driver for Gigabyte AORUS Waterforce AIO CPU coolers: X240, X280 and X360.
 *
 * Copyright 2023 Aleksa Savic <savicaleksa83@gmail.com>
 */

#include <linux/debugfs.h>
#include <linux/hid.h>
#include <linux/hwmon.h>
#include <linux/jiffies.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/unaligned.h>

#define DRIVER_NAME	"gigabyte_waterforce"

#define USB_VENDOR_ID_GIGABYTE		0x1044
#define USB_PRODUCT_ID_WATERFORCE	0x7a4d	/* Gigabyte AORUS WATERFORCE X240, X280 and X360 */

#define STATUS_VALIDITY		(2 * 1000)	/* ms */
#define MAX_REPORT_LENGTH	6144

#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

/* 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 };

/* Command lengths */
#define GET_STATUS_CMD_LENGTH		2
#define GET_FIRMWARE_VER_CMD_LENGTH	2

static const char *const waterforce_temp_label[] = {
	"Coolant 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;
	/* For locking access to buffer */
	struct mutex buffer_lock;
	/* For queueing multiple readers */
	struct mutex status_report_request_mutex;
	/* For reinitializing the completion below */
	spinlock_t status_report_request_lock;
	struct completion status_report_received;
	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;
	unsigned long updated;	/* jiffies */
};

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:
		case hwmon_temp_input:
			return 0444;
		default:
			break;
		}
		break;
	case hwmon_fan:
		switch (attr) {
		case hwmon_fan_label:
		case hwmon_fan_input:
			return 0444;
		default:
			break;
		}
		break;
	case hwmon_pwm:
		switch (attr) {
		case hwmon_pwm_input:
			return 0444;
		default:
			break;
		}
		break;
	default:
		break;
	}

	return 0;
}

/* Writes the command to the device with the rest of the report 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);

	memcpy_and_pad(priv->buffer, MAX_REPORT_LENGTH, cmd, cmd_length, 0x00);
	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 = mutex_lock_interruptible(&priv->status_report_request_mutex);

	if (ret < 0)
		return ret;

	if (!time_after(jiffies, priv->updated + msecs_to_jiffies(STATUS_VALIDITY))) {
		/* Data is up to date */
		goto unlock_and_return;
	}

	/*
	 * Disable raw event parsing for a moment to safely reinitialize the
	 * completion. Reinit is done because hidraw could have triggered
	 * the raw event parsing and marked the priv->status_report_received
	 * completion as done.
	 */
	spin_lock_bh(&priv->status_report_request_lock);
	reinit_completion(&priv->status_report_received);
	spin_unlock_bh(&priv->status_report_request_lock);

	/* Send command for getting status */
	ret = waterforce_write_expanded(priv, get_status_cmd, GET_STATUS_CMD_LENGTH);
	if (ret < 0)
		goto unlock_and_return;

	ret = wait_for_completion_interruptible_timeout(&priv->status_report_received,
							msecs_to_jiffies(STATUS_VALIDITY));
	if (ret == 0)
		ret = -ETIMEDOUT;

unlock_and_return:
	mutex_unlock(&priv->status_report_request_mutex);
	if (ret < 0)
		return ret;

	return 0;
}

static int waterforce_read(struct device *dev, enum hwmon_sensor_types type,
			   u32 attr, int channel, long *val)
{
	struct waterforce_data *priv = dev_get_drvdata(dev);
	int ret = waterforce_get_status(priv);

	if (ret < 0)
		return ret;

	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:
			return -EOPNOTSUPP;
		}
		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)
{
	struct waterforce_data *priv = hid_get_drvdata(hdev);
	int ret;

	ret = waterforce_write_expanded(priv, get_firmware_ver_cmd, GET_FIRMWARE_VER_CMD_LENGTH);
	if (ret < 0)
		return ret;

	ret = wait_for_completion_interruptible_timeout(&priv->fw_version_processed,
							msecs_to_jiffies(STATUS_VALIDITY));
	if (ret == 0)
		return -ETIMEDOUT;
	else if (ret < 0)
		return ret;

	return 0;
}

static const struct hwmon_ops waterforce_hwmon_ops = {
	.is_visible = waterforce_is_visible,
	.read = waterforce_read,
	.read_string = waterforce_read_string
};

static const struct hwmon_channel_info *waterforce_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),
	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];

		if (!completion_done(&priv->fw_version_processed))
			complete_all(&priv->fw_version_processed);
		return 0;
	}

	if (data[0] != get_status_cmd[0] || data[1] != get_status_cmd[1])
		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];

	spin_lock(&priv->status_report_request_lock);
	if (!completion_done(&priv->status_report_received))
		complete_all(&priv->status_report_received);
	spin_unlock(&priv->status_report_request_lock);

	priv->updated = jiffies;

	return 0;
}

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];

	if (!priv->firmware_version)
		return;	/* There's nothing to show in debugfs */

	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);
}

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 priv->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 - msecs_to_jiffies(STATUS_VALIDITY);

	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);
		return ret;
	}

	ret = hid_hw_open(hdev);
	if (ret) {
		hid_err(hdev, "hid hw open failed with %d\n", ret);
		goto fail_and_stop;
	}

	priv->buffer = devm_kzalloc(&hdev->dev, MAX_REPORT_LENGTH, GFP_KERNEL);
	if (!priv->buffer) {
		ret = -ENOMEM;
		goto fail_and_close;
	}

	mutex_init(&priv->status_report_request_mutex);
	mutex_init(&priv->buffer_lock);
	spin_lock_init(&priv->status_report_request_lock);
	init_completion(&priv->status_report_received);
	init_completion(&priv->fw_version_processed);

	hid_device_io_start(hdev);
	ret = waterforce_get_fw_ver(hdev);
	if (ret < 0)
		hid_warn(hdev, "fw version request failed with %d\n", ret);

	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;
	}

	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);

	debugfs_remove_recursive(priv->debugfs);
	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) },
	{ }
};

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 <savicaleksa83@gmail.com>");
MODULE_DESCRIPTION("Hwmon driver for Gigabyte AORUS Waterforce AIO coolers");