xref: /openbmc/linux/drivers/hwmon/ftsteutates.c (revision 6a87e0f0)
1  // SPDX-License-Identifier: GPL-2.0-or-later
2  /*
3   * Support for the FTS Systemmonitoring Chip "Teutates"
4   *
5   * Copyright (C) 2016 Fujitsu Technology Solutions GmbH,
6   *		  Thilo Cestonaro <thilo.cestonaro@ts.fujitsu.com>
7   */
8  #include <linux/err.h>
9  #include <linux/hwmon.h>
10  #include <linux/i2c.h>
11  #include <linux/init.h>
12  #include <linux/jiffies.h>
13  #include <linux/math.h>
14  #include <linux/module.h>
15  #include <linux/mutex.h>
16  #include <linux/slab.h>
17  #include <linux/watchdog.h>
18  
19  #define FTS_DEVICE_ID_REG		0x0000
20  #define FTS_DEVICE_REVISION_REG		0x0001
21  #define FTS_DEVICE_STATUS_REG		0x0004
22  #define FTS_SATELLITE_STATUS_REG	0x0005
23  #define FTS_EVENT_STATUS_REG		0x0006
24  #define FTS_GLOBAL_CONTROL_REG		0x0007
25  
26  #define FTS_DEVICE_DETECT_REG_1		0x0C
27  #define FTS_DEVICE_DETECT_REG_2		0x0D
28  #define FTS_DEVICE_DETECT_REG_3		0x0E
29  
30  #define FTS_SENSOR_EVENT_REG		0x0010
31  
32  #define FTS_FAN_EVENT_REG		0x0014
33  #define FTS_FAN_PRESENT_REG		0x0015
34  
35  #define FTS_POWER_ON_TIME_COUNTER_A	0x007A
36  #define FTS_POWER_ON_TIME_COUNTER_B	0x007B
37  #define FTS_POWER_ON_TIME_COUNTER_C	0x007C
38  
39  #define FTS_PAGE_SELECT_REG		0x007F
40  
41  #define FTS_WATCHDOG_TIME_PRESET	0x000B
42  #define FTS_WATCHDOG_CONTROL		0x5081
43  
44  #define FTS_NO_FAN_SENSORS		0x08
45  #define FTS_NO_TEMP_SENSORS		0x10
46  #define FTS_NO_VOLT_SENSORS		0x04
47  
48  #define FTS_FAN_SOURCE_INVALID		0xff
49  
50  static const unsigned short normal_i2c[] = { 0x73, I2C_CLIENT_END };
51  
52  static const struct i2c_device_id fts_id[] = {
53  	{ "ftsteutates", 0 },
54  	{ }
55  };
56  MODULE_DEVICE_TABLE(i2c, fts_id);
57  
58  enum WATCHDOG_RESOLUTION {
59  	seconds = 1,
60  	minutes = 60
61  };
62  
63  struct fts_data {
64  	struct i2c_client *client;
65  	/* update sensor data lock */
66  	struct mutex update_lock;
67  	/* read/write register lock */
68  	struct mutex access_lock;
69  	unsigned long last_updated; /* in jiffies */
70  	struct watchdog_device wdd;
71  	enum WATCHDOG_RESOLUTION resolution;
72  	bool valid; /* false until following fields are valid */
73  
74  	u8 volt[FTS_NO_VOLT_SENSORS];
75  
76  	u8 temp_input[FTS_NO_TEMP_SENSORS];
77  	u8 temp_alarm;
78  
79  	u8 fan_present;
80  	u8 fan_input[FTS_NO_FAN_SENSORS]; /* in rps */
81  	u8 fan_source[FTS_NO_FAN_SENSORS];
82  	u8 fan_alarm;
83  };
84  
85  #define FTS_REG_FAN_INPUT(idx) ((idx) + 0x20)
86  #define FTS_REG_FAN_SOURCE(idx) ((idx) + 0x30)
87  #define FTS_REG_FAN_CONTROL(idx) (((idx) << 16) + 0x4881)
88  
89  #define FTS_REG_TEMP_INPUT(idx) ((idx) + 0x40)
90  #define FTS_REG_TEMP_CONTROL(idx) (((idx) << 16) + 0x0681)
91  
92  #define FTS_REG_VOLT(idx) ((idx) + 0x18)
93  
94  /*****************************************************************************/
95  /* I2C Helper functions							     */
96  /*****************************************************************************/
97  static int fts_read_byte(struct i2c_client *client, unsigned short reg)
98  {
99  	int ret;
100  	unsigned char page = reg >> 8;
101  	struct fts_data *data = dev_get_drvdata(&client->dev);
102  
103  	mutex_lock(&data->access_lock);
104  
105  	dev_dbg(&client->dev, "page select - page: 0x%.02x\n", page);
106  	ret = i2c_smbus_write_byte_data(client, FTS_PAGE_SELECT_REG, page);
107  	if (ret < 0)
108  		goto error;
109  
110  	reg &= 0xFF;
111  	ret = i2c_smbus_read_byte_data(client, reg);
112  	dev_dbg(&client->dev, "read - reg: 0x%.02x: val: 0x%.02x\n", reg, ret);
113  
114  error:
115  	mutex_unlock(&data->access_lock);
116  	return ret;
117  }
118  
119  static int fts_write_byte(struct i2c_client *client, unsigned short reg,
120  			  unsigned char value)
121  {
122  	int ret;
123  	unsigned char page = reg >> 8;
124  	struct fts_data *data = dev_get_drvdata(&client->dev);
125  
126  	mutex_lock(&data->access_lock);
127  
128  	dev_dbg(&client->dev, "page select - page: 0x%.02x\n", page);
129  	ret = i2c_smbus_write_byte_data(client, FTS_PAGE_SELECT_REG, page);
130  	if (ret < 0)
131  		goto error;
132  
133  	reg &= 0xFF;
134  	dev_dbg(&client->dev,
135  		"write - reg: 0x%.02x: val: 0x%.02x\n", reg, value);
136  	ret = i2c_smbus_write_byte_data(client, reg, value);
137  
138  error:
139  	mutex_unlock(&data->access_lock);
140  	return ret;
141  }
142  
143  /*****************************************************************************/
144  /* Data Updater Helper function						     */
145  /*****************************************************************************/
146  static int fts_update_device(struct fts_data *data)
147  {
148  	int i;
149  	int err = 0;
150  
151  	mutex_lock(&data->update_lock);
152  	if (!time_after(jiffies, data->last_updated + 2 * HZ) && data->valid)
153  		goto exit;
154  
155  	err = fts_read_byte(data->client, FTS_DEVICE_STATUS_REG);
156  	if (err < 0)
157  		goto exit;
158  
159  	data->valid = !!(err & 0x02); /* Data not ready yet */
160  	if (unlikely(!data->valid)) {
161  		err = -EAGAIN;
162  		goto exit;
163  	}
164  
165  	err = fts_read_byte(data->client, FTS_FAN_PRESENT_REG);
166  	if (err < 0)
167  		goto exit;
168  	data->fan_present = err;
169  
170  	err = fts_read_byte(data->client, FTS_FAN_EVENT_REG);
171  	if (err < 0)
172  		goto exit;
173  	data->fan_alarm = err;
174  
175  	for (i = 0; i < FTS_NO_FAN_SENSORS; i++) {
176  		if (data->fan_present & BIT(i)) {
177  			err = fts_read_byte(data->client, FTS_REG_FAN_INPUT(i));
178  			if (err < 0)
179  				goto exit;
180  			data->fan_input[i] = err;
181  
182  			err = fts_read_byte(data->client,
183  					    FTS_REG_FAN_SOURCE(i));
184  			if (err < 0)
185  				goto exit;
186  			data->fan_source[i] = err;
187  		} else {
188  			data->fan_input[i] = 0;
189  			data->fan_source[i] = FTS_FAN_SOURCE_INVALID;
190  		}
191  	}
192  
193  	err = fts_read_byte(data->client, FTS_SENSOR_EVENT_REG);
194  	if (err < 0)
195  		goto exit;
196  	data->temp_alarm = err;
197  
198  	for (i = 0; i < FTS_NO_TEMP_SENSORS; i++) {
199  		err = fts_read_byte(data->client, FTS_REG_TEMP_INPUT(i));
200  		if (err < 0)
201  			goto exit;
202  		data->temp_input[i] = err;
203  	}
204  
205  	for (i = 0; i < FTS_NO_VOLT_SENSORS; i++) {
206  		err = fts_read_byte(data->client, FTS_REG_VOLT(i));
207  		if (err < 0)
208  			goto exit;
209  		data->volt[i] = err;
210  	}
211  	data->last_updated = jiffies;
212  	err = 0;
213  exit:
214  	mutex_unlock(&data->update_lock);
215  	return err;
216  }
217  
218  /*****************************************************************************/
219  /* Watchdog functions							     */
220  /*****************************************************************************/
221  static int fts_wd_set_resolution(struct fts_data *data,
222  				 enum WATCHDOG_RESOLUTION resolution)
223  {
224  	int ret;
225  
226  	if (data->resolution == resolution)
227  		return 0;
228  
229  	ret = fts_read_byte(data->client, FTS_WATCHDOG_CONTROL);
230  	if (ret < 0)
231  		return ret;
232  
233  	if ((resolution == seconds && ret & BIT(1)) ||
234  	    (resolution == minutes && (ret & BIT(1)) == 0)) {
235  		data->resolution = resolution;
236  		return 0;
237  	}
238  
239  	if (resolution == seconds)
240  		ret |= BIT(1);
241  	else
242  		ret &= ~BIT(1);
243  
244  	ret = fts_write_byte(data->client, FTS_WATCHDOG_CONTROL, ret);
245  	if (ret < 0)
246  		return ret;
247  
248  	data->resolution = resolution;
249  	return ret;
250  }
251  
252  static int fts_wd_set_timeout(struct watchdog_device *wdd, unsigned int timeout)
253  {
254  	struct fts_data *data;
255  	enum WATCHDOG_RESOLUTION resolution = seconds;
256  	int ret;
257  
258  	data = watchdog_get_drvdata(wdd);
259  	/* switch watchdog resolution to minutes if timeout does not fit
260  	 * into a byte
261  	 */
262  	if (timeout > 0xFF) {
263  		timeout = DIV_ROUND_UP(timeout, 60) * 60;
264  		resolution = minutes;
265  	}
266  
267  	ret = fts_wd_set_resolution(data, resolution);
268  	if (ret < 0)
269  		return ret;
270  
271  	wdd->timeout = timeout;
272  	return 0;
273  }
274  
275  static int fts_wd_start(struct watchdog_device *wdd)
276  {
277  	struct fts_data *data = watchdog_get_drvdata(wdd);
278  
279  	return fts_write_byte(data->client, FTS_WATCHDOG_TIME_PRESET,
280  			      wdd->timeout / (u8)data->resolution);
281  }
282  
283  static int fts_wd_stop(struct watchdog_device *wdd)
284  {
285  	struct fts_data *data;
286  
287  	data = watchdog_get_drvdata(wdd);
288  	return fts_write_byte(data->client, FTS_WATCHDOG_TIME_PRESET, 0);
289  }
290  
291  static const struct watchdog_info fts_wd_info = {
292  	.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
293  	.identity = "FTS Teutates Hardware Watchdog",
294  };
295  
296  static const struct watchdog_ops fts_wd_ops = {
297  	.owner = THIS_MODULE,
298  	.start = fts_wd_start,
299  	.stop = fts_wd_stop,
300  	.set_timeout = fts_wd_set_timeout,
301  };
302  
303  static int fts_watchdog_init(struct fts_data *data)
304  {
305  	int timeout, ret;
306  
307  	watchdog_set_drvdata(&data->wdd, data);
308  
309  	timeout = fts_read_byte(data->client, FTS_WATCHDOG_TIME_PRESET);
310  	if (timeout < 0)
311  		return timeout;
312  
313  	/* watchdog not running, set timeout to a default of 60 sec. */
314  	if (timeout == 0) {
315  		ret = fts_wd_set_resolution(data, seconds);
316  		if (ret < 0)
317  			return ret;
318  		data->wdd.timeout = 60;
319  	} else {
320  		ret = fts_read_byte(data->client, FTS_WATCHDOG_CONTROL);
321  		if (ret < 0)
322  			return ret;
323  
324  		data->resolution = ret & BIT(1) ? seconds : minutes;
325  		data->wdd.timeout = timeout * (u8)data->resolution;
326  		set_bit(WDOG_HW_RUNNING, &data->wdd.status);
327  	}
328  
329  	/* Register our watchdog part */
330  	data->wdd.info = &fts_wd_info;
331  	data->wdd.ops = &fts_wd_ops;
332  	data->wdd.parent = &data->client->dev;
333  	data->wdd.min_timeout = 1;
334  
335  	/* max timeout 255 minutes. */
336  	data->wdd.max_hw_heartbeat_ms = 0xFF * 60 * MSEC_PER_SEC;
337  
338  	return devm_watchdog_register_device(&data->client->dev, &data->wdd);
339  }
340  
341  static umode_t fts_is_visible(const void *devdata, enum hwmon_sensor_types type, u32 attr,
342  			      int channel)
343  {
344  	switch (type) {
345  	case hwmon_temp:
346  		switch (attr) {
347  		case hwmon_temp_input:
348  		case hwmon_temp_fault:
349  			return 0444;
350  		case hwmon_temp_alarm:
351  			return 0644;
352  		default:
353  			break;
354  		}
355  		break;
356  	case hwmon_fan:
357  		switch (attr) {
358  		case hwmon_fan_input:
359  		case hwmon_fan_fault:
360  			return 0444;
361  		case hwmon_fan_alarm:
362  			return 0644;
363  		default:
364  			break;
365  		}
366  		break;
367  	case hwmon_pwm:
368  	case hwmon_in:
369  		return 0444;
370  	default:
371  		break;
372  	}
373  
374  	return 0;
375  }
376  
377  static int fts_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel,
378  		    long *val)
379  {
380  	struct fts_data *data = dev_get_drvdata(dev);
381  	int ret = fts_update_device(data);
382  
383  	if (ret < 0)
384  		return ret;
385  
386  	switch (type) {
387  	case hwmon_temp:
388  		switch (attr) {
389  		case hwmon_temp_input:
390  			*val = (data->temp_input[channel] - 64) * 1000;
391  
392  			return 0;
393  		case hwmon_temp_alarm:
394  			*val = !!(data->temp_alarm & BIT(channel));
395  
396  			return 0;
397  		case hwmon_temp_fault:
398  			/* 00h Temperature = Sensor Error */;
399  			*val = (data->temp_input[channel] == 0);
400  
401  			return 0;
402  		default:
403  			break;
404  		}
405  		break;
406  	case hwmon_fan:
407  		switch (attr) {
408  		case hwmon_fan_input:
409  			*val = data->fan_input[channel] * 60;
410  
411  			return 0;
412  		case hwmon_fan_alarm:
413  			*val = !!(data->fan_alarm & BIT(channel));
414  
415  			return 0;
416  		case hwmon_fan_fault:
417  			*val = !(data->fan_present & BIT(channel));
418  
419  			return 0;
420  		default:
421  			break;
422  		}
423  		break;
424  	case hwmon_pwm:
425  		switch (attr) {
426  		case hwmon_pwm_auto_channels_temp:
427  			if (data->fan_source[channel] == FTS_FAN_SOURCE_INVALID)
428  				*val = 0;
429  			else
430  				*val = BIT(data->fan_source[channel]);
431  
432  			return 0;
433  		default:
434  			break;
435  		}
436  		break;
437  	case hwmon_in:
438  		switch (attr) {
439  		case hwmon_in_input:
440  			*val = DIV_ROUND_CLOSEST(data->volt[channel] * 3300, 255);
441  
442  			return 0;
443  		default:
444  			break;
445  		}
446  		break;
447  	default:
448  		break;
449  	}
450  
451  	return -EOPNOTSUPP;
452  }
453  
454  static int fts_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel,
455  		     long val)
456  {
457  	struct fts_data *data = dev_get_drvdata(dev);
458  	int ret = fts_update_device(data);
459  
460  	if (ret < 0)
461  		return ret;
462  
463  	switch (type) {
464  	case hwmon_temp:
465  		switch (attr) {
466  		case hwmon_temp_alarm:
467  			if (val)
468  				return -EINVAL;
469  
470  			mutex_lock(&data->update_lock);
471  			ret = fts_read_byte(data->client, FTS_REG_TEMP_CONTROL(channel));
472  			if (ret >= 0)
473  				ret = fts_write_byte(data->client, FTS_REG_TEMP_CONTROL(channel),
474  						     ret | 0x1);
475  			if (ret >= 0)
476  				data->valid = false;
477  
478  			mutex_unlock(&data->update_lock);
479  			if (ret < 0)
480  				return ret;
481  
482  			return 0;
483  		default:
484  			break;
485  		}
486  		break;
487  	case hwmon_fan:
488  		switch (attr) {
489  		case hwmon_fan_alarm:
490  			if (val)
491  				return -EINVAL;
492  
493  			mutex_lock(&data->update_lock);
494  			ret = fts_read_byte(data->client, FTS_REG_FAN_CONTROL(channel));
495  			if (ret >= 0)
496  				ret = fts_write_byte(data->client, FTS_REG_FAN_CONTROL(channel),
497  						     ret | 0x1);
498  			if (ret >= 0)
499  				data->valid = false;
500  
501  			mutex_unlock(&data->update_lock);
502  			if (ret < 0)
503  				return ret;
504  
505  			return 0;
506  		default:
507  			break;
508  		}
509  		break;
510  	default:
511  		break;
512  	}
513  
514  	return -EOPNOTSUPP;
515  }
516  
517  static const struct hwmon_ops fts_ops = {
518  	.is_visible = fts_is_visible,
519  	.read = fts_read,
520  	.write = fts_write,
521  };
522  
523  static const struct hwmon_channel_info * const fts_info[] = {
524  	HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ),
525  	HWMON_CHANNEL_INFO(temp,
526  			   HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
527  			   HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
528  			   HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
529  			   HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
530  			   HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
531  			   HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
532  			   HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
533  			   HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
534  			   HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
535  			   HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
536  			   HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
537  			   HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
538  			   HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
539  			   HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
540  			   HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
541  			   HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT
542  			   ),
543  	HWMON_CHANNEL_INFO(fan,
544  			   HWMON_F_INPUT | HWMON_F_ALARM | HWMON_F_FAULT,
545  			   HWMON_F_INPUT | HWMON_F_ALARM | HWMON_F_FAULT,
546  			   HWMON_F_INPUT | HWMON_F_ALARM | HWMON_F_FAULT,
547  			   HWMON_F_INPUT | HWMON_F_ALARM | HWMON_F_FAULT,
548  			   HWMON_F_INPUT | HWMON_F_ALARM | HWMON_F_FAULT,
549  			   HWMON_F_INPUT | HWMON_F_ALARM | HWMON_F_FAULT,
550  			   HWMON_F_INPUT | HWMON_F_ALARM | HWMON_F_FAULT,
551  			   HWMON_F_INPUT | HWMON_F_ALARM | HWMON_F_FAULT
552  			   ),
553  	HWMON_CHANNEL_INFO(pwm,
554  			   HWMON_PWM_AUTO_CHANNELS_TEMP,
555  			   HWMON_PWM_AUTO_CHANNELS_TEMP,
556  			   HWMON_PWM_AUTO_CHANNELS_TEMP,
557  			   HWMON_PWM_AUTO_CHANNELS_TEMP,
558  			   HWMON_PWM_AUTO_CHANNELS_TEMP,
559  			   HWMON_PWM_AUTO_CHANNELS_TEMP,
560  			   HWMON_PWM_AUTO_CHANNELS_TEMP,
561  			   HWMON_PWM_AUTO_CHANNELS_TEMP
562  			   ),
563  	HWMON_CHANNEL_INFO(in,
564  			   HWMON_I_INPUT,
565  			   HWMON_I_INPUT,
566  			   HWMON_I_INPUT,
567  			   HWMON_I_INPUT
568  			   ),
569  	NULL
570  };
571  
572  static const struct hwmon_chip_info fts_chip_info = {
573  	.ops = &fts_ops,
574  	.info = fts_info,
575  };
576  
577  /*****************************************************************************/
578  /* Module initialization / remove functions				     */
579  /*****************************************************************************/
580  static int fts_detect(struct i2c_client *client,
581  		      struct i2c_board_info *info)
582  {
583  	int val;
584  
585  	/* detection works with revision greater or equal to 0x2b */
586  	val = i2c_smbus_read_byte_data(client, FTS_DEVICE_REVISION_REG);
587  	if (val < 0x2b)
588  		return -ENODEV;
589  
590  	/* Device Detect Regs must have 0x17 0x34 and 0x54 */
591  	val = i2c_smbus_read_byte_data(client, FTS_DEVICE_DETECT_REG_1);
592  	if (val != 0x17)
593  		return -ENODEV;
594  
595  	val = i2c_smbus_read_byte_data(client, FTS_DEVICE_DETECT_REG_2);
596  	if (val != 0x34)
597  		return -ENODEV;
598  
599  	val = i2c_smbus_read_byte_data(client, FTS_DEVICE_DETECT_REG_3);
600  	if (val != 0x54)
601  		return -ENODEV;
602  
603  	/*
604  	 * 0x10 == Baseboard Management Controller, 0x01 == Teutates
605  	 * Device ID Reg needs to be 0x11
606  	 */
607  	val = i2c_smbus_read_byte_data(client, FTS_DEVICE_ID_REG);
608  	if (val != 0x11)
609  		return -ENODEV;
610  
611  	strscpy(info->type, fts_id[0].name, I2C_NAME_SIZE);
612  	info->flags = 0;
613  	return 0;
614  }
615  
616  static int fts_probe(struct i2c_client *client)
617  {
618  	u8 revision;
619  	struct fts_data *data;
620  	int err;
621  	s8 deviceid;
622  	struct device *hwmon_dev;
623  
624  	if (client->addr != 0x73)
625  		return -ENODEV;
626  
627  	/* Baseboard Management Controller check */
628  	deviceid = i2c_smbus_read_byte_data(client, FTS_DEVICE_ID_REG);
629  	if (deviceid > 0 && (deviceid & 0xF0) == 0x10) {
630  		switch (deviceid & 0x0F) {
631  		case 0x01:
632  			break;
633  		default:
634  			dev_dbg(&client->dev,
635  				"No Baseboard Management Controller\n");
636  			return -ENODEV;
637  		}
638  	} else {
639  		dev_dbg(&client->dev, "No fujitsu board\n");
640  		return -ENODEV;
641  	}
642  
643  	data = devm_kzalloc(&client->dev, sizeof(struct fts_data),
644  			    GFP_KERNEL);
645  	if (!data)
646  		return -ENOMEM;
647  
648  	mutex_init(&data->update_lock);
649  	mutex_init(&data->access_lock);
650  	data->client = client;
651  	dev_set_drvdata(&client->dev, data);
652  
653  	err = i2c_smbus_read_byte_data(client, FTS_DEVICE_REVISION_REG);
654  	if (err < 0)
655  		return err;
656  	revision = err;
657  
658  	hwmon_dev = devm_hwmon_device_register_with_info(&client->dev, "ftsteutates", data,
659  							 &fts_chip_info, NULL);
660  	if (IS_ERR(hwmon_dev))
661  		return PTR_ERR(hwmon_dev);
662  
663  	err = fts_watchdog_init(data);
664  	if (err)
665  		return err;
666  
667  	dev_info(&client->dev, "Detected FTS Teutates chip, revision: %d.%d\n",
668  		 (revision & 0xF0) >> 4, revision & 0x0F);
669  	return 0;
670  }
671  
672  /*****************************************************************************/
673  /* Module Details							     */
674  /*****************************************************************************/
675  static struct i2c_driver fts_driver = {
676  	.class = I2C_CLASS_HWMON,
677  	.driver = {
678  		.name = "ftsteutates",
679  	},
680  	.id_table = fts_id,
681  	.probe = fts_probe,
682  	.detect = fts_detect,
683  	.address_list = normal_i2c,
684  };
685  
686  module_i2c_driver(fts_driver);
687  
688  MODULE_AUTHOR("Thilo Cestonaro <thilo.cestonaro@ts.fujitsu.com>");
689  MODULE_DESCRIPTION("FTS Teutates driver");
690  MODULE_LICENSE("GPL");
691