1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Hardware monitoring driver for UCD90xxx Sequencer and System Health
4 * Controller series
5 *
6 * Copyright (C) 2011 Ericsson AB.
7 */
8
9 #include <linux/debugfs.h>
10 #include <linux/delay.h>
11 #include <linux/hex.h>
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/of.h>
15 #include <linux/init.h>
16 #include <linux/err.h>
17 #include <linux/slab.h>
18 #include <linux/i2c.h>
19 #include <linux/pmbus.h>
20 #include <linux/gpio/driver.h>
21 #include <linux/timekeeping.h>
22 #include "pmbus.h"
23
24 enum chips { ucd9000, ucd90120, ucd90124, ucd90160, ucd90320, ucd9090,
25 ucd90910 };
26
27 #define UCD9000_MONITOR_CONFIG 0xd5
28 #define UCD9000_NUM_PAGES 0xd6
29 #define UCD9000_FAN_CONFIG_INDEX 0xe7
30 #define UCD9000_FAN_CONFIG 0xe8
31 #define UCD9000_MFR_STATUS 0xf3
32 #define UCD9000_GPIO_SELECT 0xfa
33 #define UCD9000_GPIO_CONFIG 0xfb
34 #define UCD9000_DEVICE_ID 0xfd
35
36 /* GPIO CONFIG bits */
37 #define UCD9000_GPIO_CONFIG_ENABLE BIT(0)
38 #define UCD9000_GPIO_CONFIG_OUT_ENABLE BIT(1)
39 #define UCD9000_GPIO_CONFIG_OUT_VALUE BIT(2)
40 #define UCD9000_GPIO_CONFIG_STATUS BIT(3)
41 #define UCD9000_GPIO_INPUT 0
42 #define UCD9000_GPIO_OUTPUT 1
43
44 #define UCD9000_MON_TYPE(x) (((x) >> 5) & 0x07)
45 #define UCD9000_MON_PAGE(x) ((x) & 0x1f)
46
47 #define UCD9000_MON_VOLTAGE 1
48 #define UCD9000_MON_TEMPERATURE 2
49 #define UCD9000_MON_CURRENT 3
50 #define UCD9000_MON_VOLTAGE_HW 4
51
52 #define UCD9000_NUM_FAN 4
53
54 #define UCD9000_GPIO_NAME_LEN 16
55 #define UCD9090_NUM_GPIOS 23
56 #define UCD901XX_NUM_GPIOS 26
57 #define UCD90320_NUM_GPIOS 84
58 #define UCD90910_NUM_GPIOS 26
59
60 #define UCD9000_DEBUGFS_NAME_LEN 24
61 #define UCD9000_GPI_COUNT 8
62 #define UCD90320_GPI_COUNT 32
63
64 struct ucd9000_data {
65 u8 fan_data[UCD9000_NUM_FAN][I2C_SMBUS_BLOCK_MAX];
66 struct pmbus_driver_info info;
67 #ifdef CONFIG_GPIOLIB
68 struct gpio_chip gpio;
69 #endif
70 struct dentry *debugfs;
71 };
72 #define to_ucd9000_data(_info) container_of(_info, struct ucd9000_data, info)
73
74 struct ucd9000_debugfs_entry {
75 struct i2c_client *client;
76 u8 index;
77 };
78
79 /*
80 * It has been observed that the UCD90320 randomly fails register access when
81 * doing another access right on the back of a register write. To mitigate this
82 * make sure that there is a minimum delay between a write access and the
83 * following access. The 500 is based on experimental data. At a delay of
84 * 350us the issue seems to go away. Add a bit of extra margin to allow for
85 * system to system differences.
86 */
87 #define UCD90320_WAIT_DELAY_US 500
88
ucd9000_get_fan_config(struct i2c_client * client,int fan)89 static int ucd9000_get_fan_config(struct i2c_client *client, int fan)
90 {
91 int fan_config = 0;
92 struct ucd9000_data *data
93 = to_ucd9000_data(pmbus_get_driver_info(client));
94
95 if (data->fan_data[fan][3] & 1)
96 fan_config |= PB_FAN_2_INSTALLED; /* Use lower bit position */
97
98 /* Pulses/revolution */
99 fan_config |= (data->fan_data[fan][3] & 0x06) >> 1;
100
101 return fan_config;
102 }
103
ucd9000_read_byte_data(struct i2c_client * client,int page,int reg)104 static int ucd9000_read_byte_data(struct i2c_client *client, int page, int reg)
105 {
106 int ret = 0;
107 int fan_config;
108
109 switch (reg) {
110 case PMBUS_FAN_CONFIG_12:
111 if (page > 0)
112 return -ENXIO;
113
114 ret = ucd9000_get_fan_config(client, 0);
115 if (ret < 0)
116 return ret;
117 fan_config = ret << 4;
118 ret = ucd9000_get_fan_config(client, 1);
119 if (ret < 0)
120 return ret;
121 fan_config |= ret;
122 ret = fan_config;
123 break;
124 case PMBUS_FAN_CONFIG_34:
125 if (page > 0)
126 return -ENXIO;
127
128 ret = ucd9000_get_fan_config(client, 2);
129 if (ret < 0)
130 return ret;
131 fan_config = ret << 4;
132 ret = ucd9000_get_fan_config(client, 3);
133 if (ret < 0)
134 return ret;
135 fan_config |= ret;
136 ret = fan_config;
137 break;
138 default:
139 ret = -ENODATA;
140 break;
141 }
142 return ret;
143 }
144
145 static const struct i2c_device_id ucd9000_id[] = {
146 {"ucd9000", ucd9000},
147 {"ucd90120", ucd90120},
148 {"ucd90124", ucd90124},
149 {"ucd90160", ucd90160},
150 {"ucd90320", ucd90320},
151 {"ucd9090", ucd9090},
152 {"ucd90910", ucd90910},
153 {}
154 };
155 MODULE_DEVICE_TABLE(i2c, ucd9000_id);
156
157 static const struct of_device_id __maybe_unused ucd9000_of_match[] = {
158 {
159 .compatible = "ti,ucd9000",
160 .data = (void *)ucd9000
161 },
162 {
163 .compatible = "ti,ucd90120",
164 .data = (void *)ucd90120
165 },
166 {
167 .compatible = "ti,ucd90124",
168 .data = (void *)ucd90124
169 },
170 {
171 .compatible = "ti,ucd90160",
172 .data = (void *)ucd90160
173 },
174 {
175 .compatible = "ti,ucd90320",
176 .data = (void *)ucd90320
177 },
178 {
179 .compatible = "ti,ucd9090",
180 .data = (void *)ucd9090
181 },
182 {
183 .compatible = "ti,ucd90910",
184 .data = (void *)ucd90910
185 },
186 { },
187 };
188 MODULE_DEVICE_TABLE(of, ucd9000_of_match);
189
190 #ifdef CONFIG_GPIOLIB
ucd9000_gpio_read_config(struct i2c_client * client,unsigned int offset)191 static int ucd9000_gpio_read_config(struct i2c_client *client,
192 unsigned int offset)
193 {
194 int ret;
195
196 /* No page set required */
197 ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_SELECT, offset);
198 if (ret < 0)
199 return ret;
200
201 return i2c_smbus_read_byte_data(client, UCD9000_GPIO_CONFIG);
202 }
203
ucd9000_gpio_get(struct gpio_chip * gc,unsigned int offset)204 static int ucd9000_gpio_get(struct gpio_chip *gc, unsigned int offset)
205 {
206 struct i2c_client *client = gpiochip_get_data(gc);
207 int ret;
208
209 ret = ucd9000_gpio_read_config(client, offset);
210 if (ret < 0)
211 return ret;
212
213 return !!(ret & UCD9000_GPIO_CONFIG_STATUS);
214 }
215
ucd9000_gpio_set(struct gpio_chip * gc,unsigned int offset,int value)216 static int ucd9000_gpio_set(struct gpio_chip *gc, unsigned int offset,
217 int value)
218 {
219 struct i2c_client *client = gpiochip_get_data(gc);
220 int ret;
221
222 ret = ucd9000_gpio_read_config(client, offset);
223 if (ret < 0) {
224 dev_dbg(&client->dev, "failed to read GPIO %d config: %d\n",
225 offset, ret);
226 return ret;
227 }
228
229 if (value) {
230 if (ret & UCD9000_GPIO_CONFIG_OUT_VALUE)
231 return 0;
232
233 ret |= UCD9000_GPIO_CONFIG_OUT_VALUE;
234 } else {
235 if (!(ret & UCD9000_GPIO_CONFIG_OUT_VALUE))
236 return 0;
237
238 ret &= ~UCD9000_GPIO_CONFIG_OUT_VALUE;
239 }
240
241 ret |= UCD9000_GPIO_CONFIG_ENABLE;
242
243 /* Page set not required */
244 ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, ret);
245 if (ret < 0) {
246 dev_dbg(&client->dev, "Failed to write GPIO %d config: %d\n",
247 offset, ret);
248 return ret;
249 }
250
251 ret &= ~UCD9000_GPIO_CONFIG_ENABLE;
252
253 ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, ret);
254 if (ret < 0)
255 dev_dbg(&client->dev, "Failed to write GPIO %d config: %d\n",
256 offset, ret);
257
258 return ret;
259 }
260
ucd9000_gpio_get_direction(struct gpio_chip * gc,unsigned int offset)261 static int ucd9000_gpio_get_direction(struct gpio_chip *gc,
262 unsigned int offset)
263 {
264 struct i2c_client *client = gpiochip_get_data(gc);
265 int ret;
266
267 ret = ucd9000_gpio_read_config(client, offset);
268 if (ret < 0)
269 return ret;
270
271 return !(ret & UCD9000_GPIO_CONFIG_OUT_ENABLE);
272 }
273
ucd9000_gpio_set_direction(struct gpio_chip * gc,unsigned int offset,bool direction_out,int requested_out)274 static int ucd9000_gpio_set_direction(struct gpio_chip *gc,
275 unsigned int offset, bool direction_out,
276 int requested_out)
277 {
278 struct i2c_client *client = gpiochip_get_data(gc);
279 int ret, config, out_val;
280
281 ret = ucd9000_gpio_read_config(client, offset);
282 if (ret < 0)
283 return ret;
284
285 if (direction_out) {
286 out_val = requested_out ? UCD9000_GPIO_CONFIG_OUT_VALUE : 0;
287
288 if (ret & UCD9000_GPIO_CONFIG_OUT_ENABLE) {
289 if ((ret & UCD9000_GPIO_CONFIG_OUT_VALUE) == out_val)
290 return 0;
291 } else {
292 ret |= UCD9000_GPIO_CONFIG_OUT_ENABLE;
293 }
294
295 if (out_val)
296 ret |= UCD9000_GPIO_CONFIG_OUT_VALUE;
297 else
298 ret &= ~UCD9000_GPIO_CONFIG_OUT_VALUE;
299
300 } else {
301 if (!(ret & UCD9000_GPIO_CONFIG_OUT_ENABLE))
302 return 0;
303
304 ret &= ~UCD9000_GPIO_CONFIG_OUT_ENABLE;
305 }
306
307 ret |= UCD9000_GPIO_CONFIG_ENABLE;
308 config = ret;
309
310 /* Page set not required */
311 ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, config);
312 if (ret < 0)
313 return ret;
314
315 config &= ~UCD9000_GPIO_CONFIG_ENABLE;
316
317 return i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, config);
318 }
319
ucd9000_gpio_direction_input(struct gpio_chip * gc,unsigned int offset)320 static int ucd9000_gpio_direction_input(struct gpio_chip *gc,
321 unsigned int offset)
322 {
323 return ucd9000_gpio_set_direction(gc, offset, UCD9000_GPIO_INPUT, 0);
324 }
325
ucd9000_gpio_direction_output(struct gpio_chip * gc,unsigned int offset,int val)326 static int ucd9000_gpio_direction_output(struct gpio_chip *gc,
327 unsigned int offset, int val)
328 {
329 return ucd9000_gpio_set_direction(gc, offset, UCD9000_GPIO_OUTPUT,
330 val);
331 }
332
ucd9000_probe_gpio(struct i2c_client * client,const struct i2c_device_id * mid,struct ucd9000_data * data)333 static void ucd9000_probe_gpio(struct i2c_client *client,
334 const struct i2c_device_id *mid,
335 struct ucd9000_data *data)
336 {
337 int rc;
338
339 switch (mid->driver_data) {
340 case ucd9090:
341 data->gpio.ngpio = UCD9090_NUM_GPIOS;
342 break;
343 case ucd90120:
344 case ucd90124:
345 case ucd90160:
346 data->gpio.ngpio = UCD901XX_NUM_GPIOS;
347 break;
348 case ucd90320:
349 data->gpio.ngpio = UCD90320_NUM_GPIOS;
350 break;
351 case ucd90910:
352 data->gpio.ngpio = UCD90910_NUM_GPIOS;
353 break;
354 default:
355 return; /* GPIO support is optional. */
356 }
357
358 /*
359 * Pinmux support has not been added to the new gpio_chip.
360 * This support should be added when possible given the mux
361 * behavior of these IO devices.
362 */
363 data->gpio.label = client->name;
364 data->gpio.get_direction = ucd9000_gpio_get_direction;
365 data->gpio.direction_input = ucd9000_gpio_direction_input;
366 data->gpio.direction_output = ucd9000_gpio_direction_output;
367 data->gpio.get = ucd9000_gpio_get;
368 data->gpio.set = ucd9000_gpio_set;
369 data->gpio.can_sleep = true;
370 data->gpio.base = -1;
371 data->gpio.parent = &client->dev;
372
373 rc = devm_gpiochip_add_data(&client->dev, &data->gpio, client);
374 if (rc)
375 dev_warn(&client->dev, "Could not add gpiochip: %d\n", rc);
376 }
377 #else
ucd9000_probe_gpio(struct i2c_client * client,const struct i2c_device_id * mid,struct ucd9000_data * data)378 static void ucd9000_probe_gpio(struct i2c_client *client,
379 const struct i2c_device_id *mid,
380 struct ucd9000_data *data)
381 {
382 }
383 #endif /* CONFIG_GPIOLIB */
384
385 #ifdef CONFIG_DEBUG_FS
ucd9000_get_mfr_status(struct i2c_client * client,u8 * buffer)386 static int ucd9000_get_mfr_status(struct i2c_client *client, u8 *buffer)
387 {
388 int ret = pmbus_set_page(client, 0, 0xff);
389
390 if (ret < 0)
391 return ret;
392
393 return i2c_smbus_read_block_data(client, UCD9000_MFR_STATUS, buffer);
394 }
395
ucd9000_debugfs_show_mfr_status_bit(void * data,u64 * val)396 static int ucd9000_debugfs_show_mfr_status_bit(void *data, u64 *val)
397 {
398 struct ucd9000_debugfs_entry *entry = data;
399 struct i2c_client *client = entry->client;
400 u8 buffer[I2C_SMBUS_BLOCK_MAX];
401 int ret, i;
402
403 ret = ucd9000_get_mfr_status(client, buffer);
404 if (ret < 0)
405 return ret;
406
407 /*
408 * GPI fault bits are in sets of 8, two bytes from end of response.
409 */
410 i = ret - 3 - entry->index / 8;
411 if (i >= 0)
412 *val = !!(buffer[i] & BIT(entry->index % 8));
413
414 return 0;
415 }
416 DEFINE_DEBUGFS_ATTRIBUTE(ucd9000_debugfs_mfr_status_bit,
417 ucd9000_debugfs_show_mfr_status_bit, NULL, "%1lld\n");
418
ucd9000_debugfs_read_mfr_status(struct file * file,char __user * buf,size_t count,loff_t * ppos)419 static ssize_t ucd9000_debugfs_read_mfr_status(struct file *file,
420 char __user *buf, size_t count,
421 loff_t *ppos)
422 {
423 struct i2c_client *client = file->private_data;
424 u8 buffer[I2C_SMBUS_BLOCK_MAX];
425 char str[(I2C_SMBUS_BLOCK_MAX * 2) + 2];
426 char *res;
427 int rc;
428
429 rc = ucd9000_get_mfr_status(client, buffer);
430 if (rc < 0)
431 return rc;
432
433 res = bin2hex(str, buffer, min(rc, I2C_SMBUS_BLOCK_MAX));
434 *res++ = '\n';
435 *res = 0;
436
437 return simple_read_from_buffer(buf, count, ppos, str, res - str);
438 }
439
440 static const struct file_operations ucd9000_debugfs_show_mfr_status_fops = {
441 .llseek = noop_llseek,
442 .read = ucd9000_debugfs_read_mfr_status,
443 .open = simple_open,
444 };
445
ucd9000_init_debugfs(struct i2c_client * client,const struct i2c_device_id * mid,struct ucd9000_data * data)446 static int ucd9000_init_debugfs(struct i2c_client *client,
447 const struct i2c_device_id *mid,
448 struct ucd9000_data *data)
449 {
450 struct dentry *debugfs;
451 struct ucd9000_debugfs_entry *entries;
452 int i, gpi_count;
453 char name[UCD9000_DEBUGFS_NAME_LEN];
454
455 debugfs = pmbus_get_debugfs_dir(client);
456 if (!debugfs)
457 return -ENOENT;
458
459 data->debugfs = debugfs_create_dir(client->name, debugfs);
460
461 /*
462 * Of the chips this driver supports, only the UCD9090, UCD90160,
463 * UCD90320, and UCD90910 report GPI faults in their MFR_STATUS
464 * register, so only create the GPI fault debugfs attributes for those
465 * chips.
466 */
467 if (mid->driver_data == ucd9090 || mid->driver_data == ucd90160 ||
468 mid->driver_data == ucd90320 || mid->driver_data == ucd90910) {
469 gpi_count = mid->driver_data == ucd90320 ? UCD90320_GPI_COUNT
470 : UCD9000_GPI_COUNT;
471 entries = devm_kcalloc(&client->dev,
472 gpi_count, sizeof(*entries),
473 GFP_KERNEL);
474 if (!entries)
475 return -ENOMEM;
476
477 for (i = 0; i < gpi_count; i++) {
478 entries[i].client = client;
479 entries[i].index = i;
480 scnprintf(name, UCD9000_DEBUGFS_NAME_LEN,
481 "gpi%d_alarm", i + 1);
482 debugfs_create_file(name, 0444, data->debugfs,
483 &entries[i],
484 &ucd9000_debugfs_mfr_status_bit);
485 }
486 }
487
488 scnprintf(name, UCD9000_DEBUGFS_NAME_LEN, "mfr_status");
489 debugfs_create_file(name, 0444, data->debugfs, client,
490 &ucd9000_debugfs_show_mfr_status_fops);
491
492 return 0;
493 }
494 #else
ucd9000_init_debugfs(struct i2c_client * client,const struct i2c_device_id * mid,struct ucd9000_data * data)495 static int ucd9000_init_debugfs(struct i2c_client *client,
496 const struct i2c_device_id *mid,
497 struct ucd9000_data *data)
498 {
499 return 0;
500 }
501 #endif /* CONFIG_DEBUG_FS */
502
ucd9000_probe(struct i2c_client * client)503 static int ucd9000_probe(struct i2c_client *client)
504 {
505 u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
506 struct ucd9000_data *data;
507 struct pmbus_driver_info *info;
508 const struct i2c_device_id *mid;
509 enum chips chip;
510 int i, ret;
511
512 if (!i2c_check_functionality(client->adapter,
513 I2C_FUNC_SMBUS_BYTE_DATA |
514 I2C_FUNC_SMBUS_BLOCK_DATA))
515 return -ENODEV;
516
517 ret = i2c_smbus_read_block_data(client, UCD9000_DEVICE_ID,
518 block_buffer);
519 if (ret < 0) {
520 dev_err(&client->dev, "Failed to read device ID\n");
521 return ret;
522 }
523 block_buffer[ret] = '\0';
524 dev_info(&client->dev, "Device ID %s\n", block_buffer);
525
526 for (mid = ucd9000_id; mid->name[0]; mid++) {
527 if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
528 break;
529 }
530 if (!mid->name[0]) {
531 dev_err(&client->dev, "Unsupported device\n");
532 return -ENODEV;
533 }
534
535 if (client->dev.of_node)
536 chip = (uintptr_t)of_device_get_match_data(&client->dev);
537 else
538 chip = mid->driver_data;
539
540 if (chip != ucd9000 && strcmp(client->name, mid->name) != 0)
541 dev_notice(&client->dev,
542 "Device mismatch: Configured %s, detected %s\n",
543 client->name, mid->name);
544
545 data = devm_kzalloc(&client->dev, sizeof(struct ucd9000_data),
546 GFP_KERNEL);
547 if (!data)
548 return -ENOMEM;
549 info = &data->info;
550
551 ret = i2c_smbus_read_byte_data(client, UCD9000_NUM_PAGES);
552 if (ret < 0) {
553 dev_err(&client->dev,
554 "Failed to read number of active pages\n");
555 return ret;
556 }
557 info->pages = ret;
558 if (!info->pages) {
559 dev_err(&client->dev, "No pages configured\n");
560 return -ENODEV;
561 }
562
563 /* The internal temperature sensor is always active */
564 info->func[0] = PMBUS_HAVE_TEMP;
565
566 /* Everything else is configurable */
567 ret = i2c_smbus_read_block_data(client, UCD9000_MONITOR_CONFIG,
568 block_buffer);
569 if (ret <= 0) {
570 dev_err(&client->dev, "Failed to read configuration data\n");
571 return -ENODEV;
572 }
573 for (i = 0; i < ret; i++) {
574 int page = UCD9000_MON_PAGE(block_buffer[i]);
575
576 if (page >= info->pages)
577 continue;
578
579 switch (UCD9000_MON_TYPE(block_buffer[i])) {
580 case UCD9000_MON_VOLTAGE:
581 case UCD9000_MON_VOLTAGE_HW:
582 info->func[page] |= PMBUS_HAVE_VOUT
583 | PMBUS_HAVE_STATUS_VOUT;
584 break;
585 case UCD9000_MON_TEMPERATURE:
586 info->func[page] |= PMBUS_HAVE_TEMP2
587 | PMBUS_HAVE_STATUS_TEMP;
588 break;
589 case UCD9000_MON_CURRENT:
590 info->func[page] |= PMBUS_HAVE_IOUT
591 | PMBUS_HAVE_STATUS_IOUT;
592 break;
593 default:
594 break;
595 }
596 }
597
598 /* Fan configuration */
599 if (mid->driver_data == ucd90124) {
600 for (i = 0; i < UCD9000_NUM_FAN; i++) {
601 i2c_smbus_write_byte_data(client,
602 UCD9000_FAN_CONFIG_INDEX, i);
603 ret = i2c_smbus_read_block_data(client,
604 UCD9000_FAN_CONFIG,
605 data->fan_data[i]);
606 if (ret < 0)
607 return ret;
608 }
609 i2c_smbus_write_byte_data(client, UCD9000_FAN_CONFIG_INDEX, 0);
610
611 info->read_byte_data = ucd9000_read_byte_data;
612 info->func[0] |= PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12
613 | PMBUS_HAVE_FAN34 | PMBUS_HAVE_STATUS_FAN34;
614 } else if (mid->driver_data == ucd90320) {
615 /* Delay SMBus operations after a write */
616 info->write_delay = UCD90320_WAIT_DELAY_US;
617 }
618
619 ucd9000_probe_gpio(client, mid, data);
620
621 ret = pmbus_do_probe(client, info);
622 if (ret)
623 return ret;
624
625 ret = ucd9000_init_debugfs(client, mid, data);
626 if (ret)
627 dev_warn(&client->dev, "Failed to register debugfs: %d\n",
628 ret);
629
630 return 0;
631 }
632
633 /* This is the driver that will be inserted */
634 static struct i2c_driver ucd9000_driver = {
635 .driver = {
636 .name = "ucd9000",
637 .of_match_table = of_match_ptr(ucd9000_of_match),
638 },
639 .probe = ucd9000_probe,
640 .id_table = ucd9000_id,
641 };
642
643 module_i2c_driver(ucd9000_driver);
644
645 MODULE_AUTHOR("Guenter Roeck");
646 MODULE_DESCRIPTION("PMBus driver for TI UCD90xxx");
647 MODULE_LICENSE("GPL");
648 MODULE_IMPORT_NS("PMBUS");
649