summaryrefslogtreecommitdiffstats
path: root/drivers/hwmon/pmbus/ucd9000.c
blob: 70cecb06f93cae04f52f8cd3ff02a3a327d406ef (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
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
/*
 * Hardware monitoring driver for UCD90xxx Sequencer and System Health
 * Controller series
 *
 * Copyright (C) 2011 Ericsson AB.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/debugfs.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/pmbus.h>
#include <linux/gpio.h>
#include <linux/gpio/driver.h>
#include "pmbus.h"

enum chips { ucd9000, ucd90120, ucd90124, ucd90160, ucd9090, ucd90910 };

#define UCD9000_MONITOR_CONFIG		0xd5
#define UCD9000_NUM_PAGES		0xd6
#define UCD9000_FAN_CONFIG_INDEX	0xe7
#define UCD9000_FAN_CONFIG		0xe8
#define UCD9000_MFR_STATUS		0xf3
#define UCD9000_GPIO_SELECT		0xfa
#define UCD9000_GPIO_CONFIG		0xfb
#define UCD9000_DEVICE_ID		0xfd

/* GPIO CONFIG bits */
#define UCD9000_GPIO_CONFIG_ENABLE	BIT(0)
#define UCD9000_GPIO_CONFIG_OUT_ENABLE	BIT(1)
#define UCD9000_GPIO_CONFIG_OUT_VALUE	BIT(2)
#define UCD9000_GPIO_CONFIG_STATUS	BIT(3)
#define UCD9000_GPIO_INPUT		0
#define UCD9000_GPIO_OUTPUT		1

#define UCD9000_MON_TYPE(x)	(((x) >> 5) & 0x07)
#define UCD9000_MON_PAGE(x)	((x) & 0x0f)

#define UCD9000_MON_VOLTAGE	1
#define UCD9000_MON_TEMPERATURE	2
#define UCD9000_MON_CURRENT	3
#define UCD9000_MON_VOLTAGE_HW	4

#define UCD9000_NUM_FAN		4

#define UCD9000_GPIO_NAME_LEN	16
#define UCD9090_NUM_GPIOS	23
#define UCD901XX_NUM_GPIOS	26
#define UCD90910_NUM_GPIOS	26

#define UCD9000_DEBUGFS_NAME_LEN	24
#define UCD9000_GPI_COUNT		8

struct ucd9000_data {
	u8 fan_data[UCD9000_NUM_FAN][I2C_SMBUS_BLOCK_MAX];
	struct pmbus_driver_info info;
#ifdef CONFIG_GPIOLIB
	struct gpio_chip gpio;
#endif
	struct dentry *debugfs;
};
#define to_ucd9000_data(_info) container_of(_info, struct ucd9000_data, info)

struct ucd9000_debugfs_entry {
	struct i2c_client *client;
	u8 index;
};

static int ucd9000_get_fan_config(struct i2c_client *client, int fan)
{
	int fan_config = 0;
	struct ucd9000_data *data
	  = to_ucd9000_data(pmbus_get_driver_info(client));

	if (data->fan_data[fan][3] & 1)
		fan_config |= PB_FAN_2_INSTALLED;   /* Use lower bit position */

	/* Pulses/revolution */
	fan_config |= (data->fan_data[fan][3] & 0x06) >> 1;

	return fan_config;
}

static int ucd9000_read_byte_data(struct i2c_client *client, int page, int reg)
{
	int ret = 0;
	int fan_config;

	switch (reg) {
	case PMBUS_FAN_CONFIG_12:
		if (page > 0)
			return -ENXIO;

		ret = ucd9000_get_fan_config(client, 0);
		if (ret < 0)
			return ret;
		fan_config = ret << 4;
		ret = ucd9000_get_fan_config(client, 1);
		if (ret < 0)
			return ret;
		fan_config |= ret;
		ret = fan_config;
		break;
	case PMBUS_FAN_CONFIG_34:
		if (page > 0)
			return -ENXIO;

		ret = ucd9000_get_fan_config(client, 2);
		if (ret < 0)
			return ret;
		fan_config = ret << 4;
		ret = ucd9000_get_fan_config(client, 3);
		if (ret < 0)
			return ret;
		fan_config |= ret;
		ret = fan_config;
		break;
	default:
		ret = -ENODATA;
		break;
	}
	return ret;
}

static const struct i2c_device_id ucd9000_id[] = {
	{"ucd9000", ucd9000},
	{"ucd90120", ucd90120},
	{"ucd90124", ucd90124},
	{"ucd90160", ucd90160},
	{"ucd9090", ucd9090},
	{"ucd90910", ucd90910},
	{}
};
MODULE_DEVICE_TABLE(i2c, ucd9000_id);

static const struct of_device_id ucd9000_of_match[] = {
	{
		.compatible = "ti,ucd9000",
		.data = (void *)ucd9000
	},
	{
		.compatible = "ti,ucd90120",
		.data = (void *)ucd90120
	},
	{
		.compatible = "ti,ucd90124",
		.data = (void *)ucd90124
	},
	{
		.compatible = "ti,ucd90160",
		.data = (void *)ucd90160
	},
	{
		.compatible = "ti,ucd9090",
		.data = (void *)ucd9090
	},
	{
		.compatible = "ti,ucd90910",
		.data = (void *)ucd90910
	},
	{ },
};
MODULE_DEVICE_TABLE(of, ucd9000_of_match);

#ifdef CONFIG_GPIOLIB
static int ucd9000_gpio_read_config(struct i2c_client *client,
				    unsigned int offset)
{
	int ret;

	/* No page set required */
	ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_SELECT, offset);
	if (ret < 0)
		return ret;

	return i2c_smbus_read_byte_data(client, UCD9000_GPIO_CONFIG);
}

static int ucd9000_gpio_get(struct gpio_chip *gc, unsigned int offset)
{
	struct i2c_client *client  = gpiochip_get_data(gc);
	int ret;

	ret = ucd9000_gpio_read_config(client, offset);
	if (ret < 0)
		return ret;

	return !!(ret & UCD9000_GPIO_CONFIG_STATUS);
}

static void ucd9000_gpio_set(struct gpio_chip *gc, unsigned int offset,
			     int value)
{
	struct i2c_client *client = gpiochip_get_data(gc);
	int ret;

	ret = ucd9000_gpio_read_config(client, offset);
	if (ret < 0) {
		dev_dbg(&client->dev, "failed to read GPIO %d config: %d\n",
			offset, ret);
		return;
	}

	if (value) {
		if (ret & UCD9000_GPIO_CONFIG_STATUS)
			return;

		ret |= UCD9000_GPIO_CONFIG_STATUS;
	} else {
		if (!(ret & UCD9000_GPIO_CONFIG_STATUS))
			return;

		ret &= ~UCD9000_GPIO_CONFIG_STATUS;
	}

	ret |= UCD9000_GPIO_CONFIG_ENABLE;

	/* Page set not required */
	ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, ret);
	if (ret < 0) {
		dev_dbg(&client->dev, "Failed to write GPIO %d config: %d\n",
			offset, ret);
		return;
	}

	ret &= ~UCD9000_GPIO_CONFIG_ENABLE;

	ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, ret);
	if (ret < 0)
		dev_dbg(&client->dev, "Failed to write GPIO %d config: %d\n",
			offset, ret);
}

static int ucd9000_gpio_get_direction(struct gpio_chip *gc,
				      unsigned int offset)
{
	struct i2c_client *client = gpiochip_get_data(gc);
	int ret;

	ret = ucd9000_gpio_read_config(client, offset);
	if (ret < 0)
		return ret;

	return !(ret & UCD9000_GPIO_CONFIG_OUT_ENABLE);
}

static int ucd9000_gpio_set_direction(struct gpio_chip *gc,
				      unsigned int offset, bool direction_out,
				      int requested_out)
{
	struct i2c_client *client = gpiochip_get_data(gc);
	int ret, config, out_val;

	ret = ucd9000_gpio_read_config(client, offset);
	if (ret < 0)
		return ret;

	if (direction_out) {
		out_val = requested_out ? UCD9000_GPIO_CONFIG_OUT_VALUE : 0;

		if (ret & UCD9000_GPIO_CONFIG_OUT_ENABLE) {
			if ((ret & UCD9000_GPIO_CONFIG_OUT_VALUE) == out_val)
				return 0;
		} else {
			ret |= UCD9000_GPIO_CONFIG_OUT_ENABLE;
		}

		if (out_val)
			ret |= UCD9000_GPIO_CONFIG_OUT_VALUE;
		else
			ret &= ~UCD9000_GPIO_CONFIG_OUT_VALUE;

	} else {
		if (!(ret & UCD9000_GPIO_CONFIG_OUT_ENABLE))
			return 0;

		ret &= ~UCD9000_GPIO_CONFIG_OUT_ENABLE;
	}

	ret |= UCD9000_GPIO_CONFIG_ENABLE;
	config = ret;

	/* Page set not required */
	ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, config);
	if (ret < 0)
		return ret;

	config &= ~UCD9000_GPIO_CONFIG_ENABLE;

	return i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, config);
}

static int ucd9000_gpio_direction_input(struct gpio_chip *gc,
					unsigned int offset)
{
	return ucd9000_gpio_set_direction(gc, offset, UCD9000_GPIO_INPUT, 0);
}

static int ucd9000_gpio_direction_output(struct gpio_chip *gc,
					 unsigned int offset, int val)
{
	return ucd9000_gpio_set_direction(gc, offset, UCD9000_GPIO_OUTPUT,
					  val);
}

static void ucd9000_probe_gpio(struct i2c_client *client,
			       const struct i2c_device_id *mid,
			       struct ucd9000_data *data)
{
	int rc;

	switch (mid->driver_data) {
	case ucd9090:
		data->gpio.ngpio = UCD9090_NUM_GPIOS;
		break;
	case ucd90120:
	case ucd90124:
	case ucd90160:
		data->gpio.ngpio = UCD901XX_NUM_GPIOS;
		break;
	case ucd90910:
		data->gpio.ngpio = UCD90910_NUM_GPIOS;
		break;
	default:
		return; /* GPIO support is optional. */
	}

	/*
	 * Pinmux support has not been added to the new gpio_chip.
	 * This support should be added when possible given the mux
	 * behavior of these IO devices.
	 */
	data->gpio.label = client->name;
	data->gpio.get_direction = ucd9000_gpio_get_direction;
	data->gpio.direction_input = ucd9000_gpio_direction_input;
	data->gpio.direction_output = ucd9000_gpio_direction_output;
	data->gpio.get = ucd9000_gpio_get;
	data->gpio.set = ucd9000_gpio_set;
	data->gpio.can_sleep = true;
	data->gpio.base = -1;
	data->gpio.parent = &client->dev;

	rc = devm_gpiochip_add_data(&client->dev, &data->gpio, client);
	if (rc)
		dev_warn(&client->dev, "Could not add gpiochip: %d\n", rc);
}
#else
static void ucd9000_probe_gpio(struct i2c_client *client,
			       const struct i2c_device_id *mid,
			       struct ucd9000_data *data)
{
}
#endif /* CONFIG_GPIOLIB */

#ifdef CONFIG_DEBUG_FS
static int ucd9000_get_mfr_status(struct i2c_client *client, u8 *buffer)
{
	int ret = pmbus_set_page(client, 0);

	if (ret < 0)
		return ret;

	return i2c_smbus_read_block_data(client, UCD9000_MFR_STATUS, buffer);
}

static int ucd9000_debugfs_show_mfr_status_bit(void *data, u64 *val)
{
	struct ucd9000_debugfs_entry *entry = data;
	struct i2c_client *client = entry->client;
	u8 buffer[I2C_SMBUS_BLOCK_MAX];
	int ret;

	ret = ucd9000_get_mfr_status(client, buffer);
	if (ret < 0)
		return ret;

	/*
	 * Attribute only created for devices with gpi fault bits at bits
	 * 16-23, which is the second byte of the response.
	 */
	*val = !!(buffer[1] & BIT(entry->index));

	return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(ucd9000_debugfs_mfr_status_bit,
			 ucd9000_debugfs_show_mfr_status_bit, NULL, "%1lld\n");

static ssize_t ucd9000_debugfs_read_mfr_status(struct file *file,
					       char __user *buf, size_t count,
					       loff_t *ppos)
{
	struct i2c_client *client = file->private_data;
	u8 buffer[I2C_SMBUS_BLOCK_MAX];
	char str[(I2C_SMBUS_BLOCK_MAX * 2) + 2];
	char *res;
	int rc;

	rc = ucd9000_get_mfr_status(client, buffer);
	if (rc < 0)
		return rc;

	res = bin2hex(str, buffer, min(rc, I2C_SMBUS_BLOCK_MAX));
	*res++ = '\n';
	*res = 0;

	return simple_read_from_buffer(buf, count, ppos, str, res - str);
}

static const struct file_operations ucd9000_debugfs_show_mfr_status_fops = {
	.llseek = noop_llseek,
	.read = ucd9000_debugfs_read_mfr_status,
	.open = simple_open,
};

static int ucd9000_init_debugfs(struct i2c_client *client,
				const struct i2c_device_id *mid,
				struct ucd9000_data *data)
{
	struct dentry *debugfs;
	struct ucd9000_debugfs_entry *entries;
	int i;
	char name[UCD9000_DEBUGFS_NAME_LEN];

	debugfs = pmbus_get_debugfs_dir(client);
	if (!debugfs)
		return -ENOENT;

	data->debugfs = debugfs_create_dir(client->name, debugfs);
	if (!data->debugfs)
		return -ENOENT;

	/*
	 * Of the chips this driver supports, only the UCD9090, UCD90160,
	 * and UCD90910 report GPI faults in their MFR_STATUS register, so only
	 * create the GPI fault debugfs attributes for those chips.
	 */
	if (mid->driver_data == ucd9090 || mid->driver_data == ucd90160 ||
	    mid->driver_data == ucd90910) {
		entries = devm_kzalloc(&client->dev,
				       sizeof(*entries) * UCD9000_GPI_COUNT,
				       GFP_KERNEL);
		if (!entries)
			return -ENOMEM;

		for (i = 0; i < UCD9000_GPI_COUNT; i++) {
			entries[i].client = client;
			entries[i].index = i;
			scnprintf(name, UCD9000_DEBUGFS_NAME_LEN,
				  "gpi%d_alarm", i + 1);
			debugfs_create_file(name, 0444, data->debugfs,
					    &entries[i],
					    &ucd9000_debugfs_mfr_status_bit);
		}
	}

	scnprintf(name, UCD9000_DEBUGFS_NAME_LEN, "mfr_status");
	debugfs_create_file(name, 0444, data->debugfs, client,
			    &ucd9000_debugfs_show_mfr_status_fops);

	return 0;
}
#else
static int ucd9000_init_debugfs(struct i2c_client *client,
				const struct i2c_device_id *mid,
				struct ucd9000_data *data)
{
	return 0;
}
#endif /* CONFIG_DEBUG_FS */

static int ucd9000_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
	struct ucd9000_data *data;
	struct pmbus_driver_info *info;
	const struct i2c_device_id *mid;
	enum chips chip;
	int i, ret;

	if (!i2c_check_functionality(client->adapter,
				     I2C_FUNC_SMBUS_BYTE_DATA |
				     I2C_FUNC_SMBUS_BLOCK_DATA))
		return -ENODEV;

	ret = i2c_smbus_read_block_data(client, UCD9000_DEVICE_ID,
					block_buffer);
	if (ret < 0) {
		dev_err(&client->dev, "Failed to read device ID\n");
		return ret;
	}
	block_buffer[ret] = '\0';
	dev_info(&client->dev, "Device ID %s\n", block_buffer);

	for (mid = ucd9000_id; mid->name[0]; mid++) {
		if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
			break;
	}
	if (!mid->name[0]) {
		dev_err(&client->dev, "Unsupported device\n");
		return -ENODEV;
	}

	if (client->dev.of_node)
		chip = (enum chips)of_device_get_match_data(&client->dev);
	else
		chip = id->driver_data;

	if (chip != ucd9000 && chip != mid->driver_data)
		dev_notice(&client->dev,
			   "Device mismatch: Configured %s, detected %s\n",
			   id->name, mid->name);

	data = devm_kzalloc(&client->dev, sizeof(struct ucd9000_data),
			    GFP_KERNEL);
	if (!data)
		return -ENOMEM;
	info = &data->info;

	ret = i2c_smbus_read_byte_data(client, UCD9000_NUM_PAGES);
	if (ret < 0) {
		dev_err(&client->dev,
			"Failed to read number of active pages\n");
		return ret;
	}
	info->pages = ret;
	if (!info->pages) {
		dev_err(&client->dev, "No pages configured\n");
		return -ENODEV;
	}

	/* The internal temperature sensor is always active */
	info->func[0] = PMBUS_HAVE_TEMP;

	/* Everything else is configurable */
	ret = i2c_smbus_read_block_data(client, UCD9000_MONITOR_CONFIG,
					block_buffer);
	if (ret <= 0) {
		dev_err(&client->dev, "Failed to read configuration data\n");
		return -ENODEV;
	}
	for (i = 0; i < ret; i++) {
		int page = UCD9000_MON_PAGE(block_buffer[i]);

		if (page >= info->pages)
			continue;

		switch (UCD9000_MON_TYPE(block_buffer[i])) {
		case UCD9000_MON_VOLTAGE:
		case UCD9000_MON_VOLTAGE_HW:
			info->func[page] |= PMBUS_HAVE_VOUT
			  | PMBUS_HAVE_STATUS_VOUT;
			break;
		case UCD9000_MON_TEMPERATURE:
			info->func[page] |= PMBUS_HAVE_TEMP2
			  | PMBUS_HAVE_STATUS_TEMP;
			break;
		case UCD9000_MON_CURRENT:
			info->func[page] |= PMBUS_HAVE_IOUT
			  | PMBUS_HAVE_STATUS_IOUT;
			break;
		default:
			break;
		}
	}

	/* Fan configuration */
	if (mid->driver_data == ucd90124) {
		for (i = 0; i < UCD9000_NUM_FAN; i++) {
			i2c_smbus_write_byte_data(client,
						  UCD9000_FAN_CONFIG_INDEX, i);
			ret = i2c_smbus_read_block_data(client,
							UCD9000_FAN_CONFIG,
							data->fan_data[i]);
			if (ret < 0)
				return ret;
		}
		i2c_smbus_write_byte_data(client, UCD9000_FAN_CONFIG_INDEX, 0);

		info->read_byte_data = ucd9000_read_byte_data;
		info->func[0] |= PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12
		  | PMBUS_HAVE_FAN34 | PMBUS_HAVE_STATUS_FAN34;
	}

	ucd9000_probe_gpio(client, mid, data);

	ret = pmbus_do_probe(client, mid, info);
	if (ret)
		return ret;

	ret = ucd9000_init_debugfs(client, mid, data);
	if (ret)
		dev_warn(&client->dev, "Failed to register debugfs: %d\n",
			 ret);

	return 0;
}

/* This is the driver that will be inserted */
static struct i2c_driver ucd9000_driver = {
	.driver = {
		.name = "ucd9000",
		.of_match_table = of_match_ptr(ucd9000_of_match),
	},
	.probe = ucd9000_probe,
	.remove = pmbus_do_remove,
	.id_table = ucd9000_id,
};

module_i2c_driver(ucd9000_driver);

MODULE_AUTHOR("Guenter Roeck");
MODULE_DESCRIPTION("PMBus driver for TI UCD90xxx");
MODULE_LICENSE("GPL");
OpenPOWER on IntegriCloud