summaryrefslogtreecommitdiffstats
path: root/drivers/hwmon/oxp-sensors.c
blob: 8d3b0f86cc57a978041bbb602f5a205041790756 (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
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
// SPDX-License-Identifier: GPL-2.0+
/*
 * Platform driver for OneXPlayer, AOK ZOE, and Aya Neo Handhelds that expose
 * fan reading and control via hwmon sysfs.
 *
 * Old OXP boards have the same DMI strings and they are told apart by
 * the boot cpu vendor (Intel/AMD). Currently only AMD boards are
 * supported but the code is made to be simple to add other handheld
 * boards in the future.
 * Fan control is provided via pwm interface in the range [0-255].
 * Old AMD boards use [0-100] as range in the EC, the written value is
 * scaled to accommodate for that. Newer boards like the mini PRO and
 * AOK ZOE are not scaled but have the same EC layout.
 *
 * Copyright (C) 2022 Joaquín I. Aramendía <samsagax@gmail.com>
 */

#include <linux/acpi.h>
#include <linux/dmi.h>
#include <linux/hwmon.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/processor.h>

/* Handle ACPI lock mechanism */
static u32 oxp_mutex;

#define ACPI_LOCK_DELAY_MS	500

static bool lock_global_acpi_lock(void)
{
	return ACPI_SUCCESS(acpi_acquire_global_lock(ACPI_LOCK_DELAY_MS, &oxp_mutex));
}

static bool unlock_global_acpi_lock(void)
{
	return ACPI_SUCCESS(acpi_release_global_lock(oxp_mutex));
}

enum oxp_board {
	aok_zoe_a1 = 1,
	aya_neo_2,
	aya_neo_air,
	aya_neo_air_plus_mendo,
	aya_neo_air_pro,
	aya_neo_geek,
	oxp_mini_amd,
	oxp_mini_amd_a07,
	oxp_mini_amd_pro,
};

static enum oxp_board board;

/* Fan reading and PWM */
#define OXP_SENSOR_FAN_REG		0x76 /* Fan reading is 2 registers long */
#define OXP_SENSOR_PWM_ENABLE_REG	0x4A /* PWM enable is 1 register long */
#define OXP_SENSOR_PWM_REG		0x4B /* PWM reading is 1 register long */

/* Turbo button takeover function
 * Older boards have different values and EC registers
 * for the same function
 */
#define OXP_OLD_TURBO_SWITCH_REG	0x1E
#define OXP_OLD_TURBO_TAKE_VAL		0x01
#define OXP_OLD_TURBO_RETURN_VAL	0x00

#define OXP_TURBO_SWITCH_REG		0xF1
#define OXP_TURBO_TAKE_VAL		0x40
#define OXP_TURBO_RETURN_VAL		0x00

static const struct dmi_system_id dmi_table[] = {
	{
		.matches = {
			DMI_MATCH(DMI_BOARD_VENDOR, "AOKZOE"),
			DMI_EXACT_MATCH(DMI_BOARD_NAME, "AOKZOE A1 AR07"),
		},
		.driver_data = (void *)aok_zoe_a1,
	},
	{
		.matches = {
			DMI_MATCH(DMI_BOARD_VENDOR, "AOKZOE"),
			DMI_EXACT_MATCH(DMI_BOARD_NAME, "AOKZOE A1 Pro"),
		},
		.driver_data = (void *)aok_zoe_a1,
	},
	{
		.matches = {
			DMI_MATCH(DMI_BOARD_VENDOR, "AYANEO"),
			DMI_EXACT_MATCH(DMI_BOARD_NAME, "AYANEO 2"),
		},
		.driver_data = (void *)aya_neo_2,
	},
	{
		.matches = {
			DMI_MATCH(DMI_BOARD_VENDOR, "AYANEO"),
			DMI_EXACT_MATCH(DMI_BOARD_NAME, "AIR"),
		},
		.driver_data = (void *)aya_neo_air,
	},
	{
		.matches = {
			DMI_MATCH(DMI_BOARD_VENDOR, "AYANEO"),
			DMI_EXACT_MATCH(DMI_BOARD_NAME, "AB05-Mendocino"),
		},
		.driver_data = (void *)aya_neo_air_plus_mendo,
	},
	{
		.matches = {
			DMI_MATCH(DMI_BOARD_VENDOR, "AYANEO"),
			DMI_EXACT_MATCH(DMI_BOARD_NAME, "AIR Pro"),
		},
		.driver_data = (void *)aya_neo_air_pro,
	},
	{
		.matches = {
			DMI_MATCH(DMI_BOARD_VENDOR, "AYANEO"),
			DMI_EXACT_MATCH(DMI_BOARD_NAME, "GEEK"),
		},
		.driver_data = (void *)aya_neo_geek,
	},
	{
		.matches = {
			DMI_MATCH(DMI_BOARD_VENDOR, "ONE-NETBOOK"),
			DMI_EXACT_MATCH(DMI_BOARD_NAME, "ONE XPLAYER"),
		},
		.driver_data = (void *)oxp_mini_amd,
	},
	{
		.matches = {
			DMI_MATCH(DMI_BOARD_VENDOR, "ONE-NETBOOK"),
			DMI_EXACT_MATCH(DMI_BOARD_NAME, "ONEXPLAYER mini A07"),
		},
		.driver_data = (void *)oxp_mini_amd_a07,
	},
	{
		.matches = {
			DMI_MATCH(DMI_BOARD_VENDOR, "ONE-NETBOOK"),
			DMI_EXACT_MATCH(DMI_BOARD_NAME, "ONEXPLAYER Mini Pro"),
		},
		.driver_data = (void *)oxp_mini_amd_pro,
	},
	{},
};

/* Helper functions to handle EC read/write */
static int read_from_ec(u8 reg, int size, long *val)
{
	int i;
	int ret;
	u8 buffer;

	if (!lock_global_acpi_lock())
		return -EBUSY;

	*val = 0;
	for (i = 0; i < size; i++) {
		ret = ec_read(reg + i, &buffer);
		if (ret)
			return ret;
		*val <<= i * 8;
		*val += buffer;
	}

	if (!unlock_global_acpi_lock())
		return -EBUSY;

	return 0;
}

static int write_to_ec(u8 reg, u8 value)
{
	int ret;

	if (!lock_global_acpi_lock())
		return -EBUSY;

	ret = ec_write(reg, value);

	if (!unlock_global_acpi_lock())
		return -EBUSY;

	return ret;
}

/* Turbo button toggle functions */
static int tt_toggle_enable(void)
{
	u8 reg;
	u8 val;

	switch (board) {
	case oxp_mini_amd_a07:
		reg = OXP_OLD_TURBO_SWITCH_REG;
		val = OXP_OLD_TURBO_TAKE_VAL;
		break;
	case oxp_mini_amd_pro:
	case aok_zoe_a1:
		reg = OXP_TURBO_SWITCH_REG;
		val = OXP_TURBO_TAKE_VAL;
		break;
	default:
		return -EINVAL;
	}
	return write_to_ec(reg, val);
}

static int tt_toggle_disable(void)
{
	u8 reg;
	u8 val;

	switch (board) {
	case oxp_mini_amd_a07:
		reg = OXP_OLD_TURBO_SWITCH_REG;
		val = OXP_OLD_TURBO_RETURN_VAL;
		break;
	case oxp_mini_amd_pro:
	case aok_zoe_a1:
		reg = OXP_TURBO_SWITCH_REG;
		val = OXP_TURBO_RETURN_VAL;
		break;
	default:
		return -EINVAL;
	}
	return write_to_ec(reg, val);
}

/* Callbacks for turbo toggle attribute */
static umode_t tt_toggle_is_visible(struct kobject *kobj,
				    struct attribute *attr, int n)
{
	switch (board) {
	case aok_zoe_a1:
	case oxp_mini_amd_a07:
	case oxp_mini_amd_pro:
		return attr->mode;
	default:
		break;
	}
	return 0;
}

static ssize_t tt_toggle_store(struct device *dev,
			       struct device_attribute *attr, const char *buf,
			       size_t count)
{
	int rval;
	bool value;

	rval = kstrtobool(buf, &value);
	if (rval)
		return rval;

	if (value) {
		rval = tt_toggle_enable();
	} else {
		rval = tt_toggle_disable();
	}
	if (rval)
		return rval;

	return count;
}

static ssize_t tt_toggle_show(struct device *dev,
			      struct device_attribute *attr, char *buf)
{
	int retval;
	u8 reg;
	long val;

	switch (board) {
	case oxp_mini_amd_a07:
		reg = OXP_OLD_TURBO_SWITCH_REG;
		break;
	case oxp_mini_amd_pro:
	case aok_zoe_a1:
		reg = OXP_TURBO_SWITCH_REG;
		break;
	default:
		return -EINVAL;
	}

	retval = read_from_ec(reg, 1, &val);
	if (retval)
		return retval;

	return sysfs_emit(buf, "%d\n", !!val);
}

static DEVICE_ATTR_RW(tt_toggle);

/* PWM enable/disable functions */
static int oxp_pwm_enable(void)
{
	return write_to_ec(OXP_SENSOR_PWM_ENABLE_REG, 0x01);
}

static int oxp_pwm_disable(void)
{
	return write_to_ec(OXP_SENSOR_PWM_ENABLE_REG, 0x00);
}

/* Callbacks for hwmon interface */
static umode_t oxp_ec_hwmon_is_visible(const void *drvdata,
				       enum hwmon_sensor_types type, u32 attr, int channel)
{
	switch (type) {
	case hwmon_fan:
		return 0444;
	case hwmon_pwm:
		return 0644;
	default:
		return 0;
	}
}

static int oxp_platform_read(struct device *dev, enum hwmon_sensor_types type,
			     u32 attr, int channel, long *val)
{
	int ret;

	switch (type) {
	case hwmon_fan:
		switch (attr) {
		case hwmon_fan_input:
			return read_from_ec(OXP_SENSOR_FAN_REG, 2, val);
		default:
			break;
		}
		break;
	case hwmon_pwm:
		switch (attr) {
		case hwmon_pwm_input:
			ret = read_from_ec(OXP_SENSOR_PWM_REG, 1, val);
			if (ret)
				return ret;
			switch (board) {
			case aya_neo_2:
			case aya_neo_air:
			case aya_neo_air_plus_mendo:
			case aya_neo_air_pro:
			case aya_neo_geek:
			case oxp_mini_amd:
			case oxp_mini_amd_a07:
				*val = (*val * 255) / 100;
				break;
			case oxp_mini_amd_pro:
			case aok_zoe_a1:
			default:
				break;
			}
			return 0;
		case hwmon_pwm_enable:
			return read_from_ec(OXP_SENSOR_PWM_ENABLE_REG, 1, val);
		default:
			break;
		}
		break;
	default:
		break;
	}
	return -EOPNOTSUPP;
}

static int oxp_platform_write(struct device *dev, enum hwmon_sensor_types type,
			      u32 attr, int channel, long val)
{
	switch (type) {
	case hwmon_pwm:
		switch (attr) {
		case hwmon_pwm_enable:
			if (val == 1)
				return oxp_pwm_enable();
			else if (val == 0)
				return oxp_pwm_disable();
			return -EINVAL;
		case hwmon_pwm_input:
			if (val < 0 || val > 255)
				return -EINVAL;
			switch (board) {
			case aya_neo_2:
			case aya_neo_air:
			case aya_neo_air_plus_mendo:
			case aya_neo_air_pro:
			case aya_neo_geek:
			case oxp_mini_amd:
			case oxp_mini_amd_a07:
				val = (val * 100) / 255;
				break;
			case aok_zoe_a1:
			case oxp_mini_amd_pro:
			default:
				break;
			}
			return write_to_ec(OXP_SENSOR_PWM_REG, val);
		default:
			break;
		}
		break;
	default:
		break;
	}
	return -EOPNOTSUPP;
}

/* Known sensors in the OXP EC controllers */
static const struct hwmon_channel_info * const oxp_platform_sensors[] = {
	HWMON_CHANNEL_INFO(fan,
			   HWMON_F_INPUT),
	HWMON_CHANNEL_INFO(pwm,
			   HWMON_PWM_INPUT | HWMON_PWM_ENABLE),
	NULL,
};

static struct attribute *oxp_ec_attrs[] = {
	&dev_attr_tt_toggle.attr,
	NULL
};

static struct attribute_group oxp_ec_attribute_group = {
	.is_visible = tt_toggle_is_visible,
	.attrs = oxp_ec_attrs,
};

static const struct attribute_group *oxp_ec_groups[] = {
	&oxp_ec_attribute_group,
	NULL
};

static const struct hwmon_ops oxp_ec_hwmon_ops = {
	.is_visible = oxp_ec_hwmon_is_visible,
	.read = oxp_platform_read,
	.write = oxp_platform_write,
};

static const struct hwmon_chip_info oxp_ec_chip_info = {
	.ops = &oxp_ec_hwmon_ops,
	.info = oxp_platform_sensors,
};

/* Initialization logic */
static int oxp_platform_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct device *hwdev;

	hwdev = devm_hwmon_device_register_with_info(dev, "oxpec", NULL,
						     &oxp_ec_chip_info, NULL);

	return PTR_ERR_OR_ZERO(hwdev);
}

static struct platform_driver oxp_platform_driver = {
	.driver = {
		.name = "oxp-platform",
		.dev_groups = oxp_ec_groups,
	},
	.probe = oxp_platform_probe,
};

static struct platform_device *oxp_platform_device;

static int __init oxp_platform_init(void)
{
	const struct dmi_system_id *dmi_entry;

	/*
	 * Have to check for AMD processor here because DMI strings are the
	 * same between Intel and AMD boards, the only way to tell them apart
	 * is the CPU.
	 * Intel boards seem to have different EC registers and values to
	 * read/write.
	 */
	dmi_entry = dmi_first_match(dmi_table);
	if (!dmi_entry || boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
		return -ENODEV;

	board = (enum oxp_board)(unsigned long)dmi_entry->driver_data;

	oxp_platform_device =
		platform_create_bundle(&oxp_platform_driver,
				       oxp_platform_probe, NULL, 0, NULL, 0);

	return PTR_ERR_OR_ZERO(oxp_platform_device);
}

static void __exit oxp_platform_exit(void)
{
	platform_device_unregister(oxp_platform_device);
	platform_driver_unregister(&oxp_platform_driver);
}

MODULE_DEVICE_TABLE(dmi, dmi_table);

module_init(oxp_platform_init);
module_exit(oxp_platform_exit);

MODULE_AUTHOR("Joaquín Ignacio Aramendía <samsagax@gmail.com>");
MODULE_DESCRIPTION("Platform driver that handles EC sensors of OneXPlayer devices");
MODULE_LICENSE("GPL");