1/*
2 * emc2103.c - Support for SMSC EMC2103
3 * Copyright (c) 2010 SMSC
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18 */
19
20#include <linux/module.h>
21#include <linux/init.h>
22#include <linux/slab.h>
23#include <linux/jiffies.h>
24#include <linux/i2c.h>
25#include <linux/hwmon.h>
26#include <linux/hwmon-sysfs.h>
27#include <linux/err.h>
28#include <linux/mutex.h>
29
30/* Addresses scanned */
31static const unsigned short normal_i2c[] = { 0x2E, I2C_CLIENT_END };
32
33static const u8 REG_TEMP[4] = { 0x00, 0x02, 0x04, 0x06 };
34static const u8 REG_TEMP_MIN[4] = { 0x3c, 0x38, 0x39, 0x3a };
35static const u8 REG_TEMP_MAX[4] = { 0x34, 0x30, 0x31, 0x32 };
36
37#define REG_CONF1 0x20
38#define REG_TEMP_MAX_ALARM 0x24
39#define REG_TEMP_MIN_ALARM 0x25
40#define REG_FAN_CONF1 0x42
41#define REG_FAN_TARGET_LO 0x4c
42#define REG_FAN_TARGET_HI 0x4d
43#define REG_FAN_TACH_HI 0x4e
44#define REG_FAN_TACH_LO 0x4f
45#define REG_PRODUCT_ID 0xfd
46#define REG_MFG_ID 0xfe
47
48/* equation 4 from datasheet: rpm = (3932160 * multipler) / count */
49#define FAN_RPM_FACTOR 3932160
50
51/*
52 * 2103-2 and 2103-4's 3rd temperature sensor can be connected to two diodes
53 * in anti-parallel mode, and in this configuration both can be read
54 * independently (so we have 4 temperature inputs). The device can't
55 * detect if it's connected in this mode, so we have to manually enable
56 * it. Default is to leave the device in the state it's already in (-1).
57 * This parameter allows APD mode to be optionally forced on or off
58 */
59static int apd = -1;
60module_param(apd, bint, 0);
61MODULE_PARM_DESC(apd, "Set to zero to disable anti-parallel diode mode");
62
63struct temperature {
64 s8 degrees;
65 u8 fraction; /* 0-7 multiples of 0.125 */
66};
67
68struct emc2103_data {
69 struct i2c_client *client;
70 const struct attribute_group *groups[4];
71 struct mutex update_lock;
72 bool valid; /* registers are valid */
73 bool fan_rpm_control;
74 int temp_count; /* num of temp sensors */
75 unsigned long last_updated; /* in jiffies */
76 struct temperature temp[4]; /* internal + 3 external */
77 s8 temp_min[4]; /* no fractional part */
78 s8 temp_max[4]; /* no fractional part */
79 u8 temp_min_alarm;
80 u8 temp_max_alarm;
81 u8 fan_multiplier;
82 u16 fan_tach;
83 u16 fan_target;
84};
85
86static int read_u8_from_i2c(struct i2c_client *client, u8 i2c_reg, u8 *output)
87{
88 int status = i2c_smbus_read_byte_data(client, i2c_reg);
89 if (status < 0) {
90 dev_warn(&client->dev, "reg 0x%02x, err %d\n",
91 i2c_reg, status);
92 } else {
93 *output = status;
94 }
95 return status;
96}
97
98static void read_temp_from_i2c(struct i2c_client *client, u8 i2c_reg,
99 struct temperature *temp)
100{
101 u8 degrees, fractional;
102
103 if (read_u8_from_i2c(client, i2c_reg, &degrees) < 0)
104 return;
105
106 if (read_u8_from_i2c(client, i2c_reg + 1, &fractional) < 0)
107 return;
108
109 temp->degrees = degrees;
110 temp->fraction = (fractional & 0xe0) >> 5;
111}
112
113static void read_fan_from_i2c(struct i2c_client *client, u16 *output,
114 u8 hi_addr, u8 lo_addr)
115{
116 u8 high_byte, lo_byte;
117
118 if (read_u8_from_i2c(client, hi_addr, &high_byte) < 0)
119 return;
120
121 if (read_u8_from_i2c(client, lo_addr, &lo_byte) < 0)
122 return;
123
124 *output = ((u16)high_byte << 5) | (lo_byte >> 3);
125}
126
127static void write_fan_target_to_i2c(struct i2c_client *client, u16 new_target)
128{
129 u8 high_byte = (new_target & 0x1fe0) >> 5;
130 u8 low_byte = (new_target & 0x001f) << 3;
131 i2c_smbus_write_byte_data(client, REG_FAN_TARGET_LO, low_byte);
132 i2c_smbus_write_byte_data(client, REG_FAN_TARGET_HI, high_byte);
133}
134
135static void read_fan_config_from_i2c(struct i2c_client *client)
136
137{
138 struct emc2103_data *data = i2c_get_clientdata(client);
139 u8 conf1;
140
141 if (read_u8_from_i2c(client, REG_FAN_CONF1, &conf1) < 0)
142 return;
143
144 data->fan_multiplier = 1 << ((conf1 & 0x60) >> 5);
145 data->fan_rpm_control = (conf1 & 0x80) != 0;
146}
147
148static struct emc2103_data *emc2103_update_device(struct device *dev)
149{
150 struct emc2103_data *data = dev_get_drvdata(dev);
151 struct i2c_client *client = data->client;
152
153 mutex_lock(&data->update_lock);
154
155 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
156 || !data->valid) {
157 int i;
158
159 for (i = 0; i < data->temp_count; i++) {
160 read_temp_from_i2c(client, REG_TEMP[i], &data->temp[i]);
161 read_u8_from_i2c(client, REG_TEMP_MIN[i],
162 &data->temp_min[i]);
163 read_u8_from_i2c(client, REG_TEMP_MAX[i],
164 &data->temp_max[i]);
165 }
166
167 read_u8_from_i2c(client, REG_TEMP_MIN_ALARM,
168 &data->temp_min_alarm);
169 read_u8_from_i2c(client, REG_TEMP_MAX_ALARM,
170 &data->temp_max_alarm);
171
172 read_fan_from_i2c(client, &data->fan_tach,
173 REG_FAN_TACH_HI, REG_FAN_TACH_LO);
174 read_fan_from_i2c(client, &data->fan_target,
175 REG_FAN_TARGET_HI, REG_FAN_TARGET_LO);
176 read_fan_config_from_i2c(client);
177
178 data->last_updated = jiffies;
179 data->valid = true;
180 }
181
182 mutex_unlock(&data->update_lock);
183
184 return data;
185}
186
187static ssize_t
188temp_show(struct device *dev, struct device_attribute *da, char *buf)
189{
190 int nr = to_sensor_dev_attr(da)->index;
191 struct emc2103_data *data = emc2103_update_device(dev);
192 int millidegrees = data->temp[nr].degrees * 1000
193 + data->temp[nr].fraction * 125;
194 return sprintf(buf, "%d\n", millidegrees);
195}
196
197static ssize_t
198temp_min_show(struct device *dev, struct device_attribute *da, char *buf)
199{
200 int nr = to_sensor_dev_attr(da)->index;
201 struct emc2103_data *data = emc2103_update_device(dev);
202 int millidegrees = data->temp_min[nr] * 1000;
203 return sprintf(buf, "%d\n", millidegrees);
204}
205
206static ssize_t
207temp_max_show(struct device *dev, struct device_attribute *da, char *buf)
208{
209 int nr = to_sensor_dev_attr(da)->index;
210 struct emc2103_data *data = emc2103_update_device(dev);
211 int millidegrees = data->temp_max[nr] * 1000;
212 return sprintf(buf, "%d\n", millidegrees);
213}
214
215static ssize_t
216temp_fault_show(struct device *dev, struct device_attribute *da, char *buf)
217{
218 int nr = to_sensor_dev_attr(da)->index;
219 struct emc2103_data *data = emc2103_update_device(dev);
220 bool fault = (data->temp[nr].degrees == -128);
221 return sprintf(buf, "%d\n", fault ? 1 : 0);
222}
223
224static ssize_t
225temp_min_alarm_show(struct device *dev, struct device_attribute *da,
226 char *buf)
227{
228 int nr = to_sensor_dev_attr(da)->index;
229 struct emc2103_data *data = emc2103_update_device(dev);
230 bool alarm = data->temp_min_alarm & (1 << nr);
231 return sprintf(buf, "%d\n", alarm ? 1 : 0);
232}
233
234static ssize_t
235temp_max_alarm_show(struct device *dev, struct device_attribute *da,
236 char *buf)
237{
238 int nr = to_sensor_dev_attr(da)->index;
239 struct emc2103_data *data = emc2103_update_device(dev);
240 bool alarm = data->temp_max_alarm & (1 << nr);
241 return sprintf(buf, "%d\n", alarm ? 1 : 0);
242}
243
244static ssize_t temp_min_store(struct device *dev, struct device_attribute *da,
245 const char *buf, size_t count)
246{
247 int nr = to_sensor_dev_attr(da)->index;
248 struct emc2103_data *data = dev_get_drvdata(dev);
249 struct i2c_client *client = data->client;
250 long val;
251
252 int result = kstrtol(buf, 10, &val);
253 if (result < 0)
254 return result;
255
256 val = DIV_ROUND_CLOSEST(clamp_val(val, -63000, 127000), 1000);
257
258 mutex_lock(&data->update_lock);
259 data->temp_min[nr] = val;
260 i2c_smbus_write_byte_data(client, REG_TEMP_MIN[nr], val);
261 mutex_unlock(&data->update_lock);
262
263 return count;
264}
265
266static ssize_t temp_max_store(struct device *dev, struct device_attribute *da,
267 const char *buf, size_t count)
268{
269 int nr = to_sensor_dev_attr(da)->index;
270 struct emc2103_data *data = dev_get_drvdata(dev);
271 struct i2c_client *client = data->client;
272 long val;
273
274 int result = kstrtol(buf, 10, &val);
275 if (result < 0)
276 return result;
277
278 val = DIV_ROUND_CLOSEST(clamp_val(val, -63000, 127000), 1000);
279
280 mutex_lock(&data->update_lock);
281 data->temp_max[nr] = val;
282 i2c_smbus_write_byte_data(client, REG_TEMP_MAX[nr], val);
283 mutex_unlock(&data->update_lock);
284
285 return count;
286}
287
288static ssize_t
289fan1_input_show(struct device *dev, struct device_attribute *da, char *buf)
290{
291 struct emc2103_data *data = emc2103_update_device(dev);
292 int rpm = 0;
293 if (data->fan_tach != 0)
294 rpm = (FAN_RPM_FACTOR * data->fan_multiplier) / data->fan_tach;
295 return sprintf(buf, "%d\n", rpm);
296}
297
298static ssize_t
299fan1_div_show(struct device *dev, struct device_attribute *da, char *buf)
300{
301 struct emc2103_data *data = emc2103_update_device(dev);
302 int fan_div = 8 / data->fan_multiplier;
303 return sprintf(buf, "%d\n", fan_div);
304}
305
306/*
307 * Note: we also update the fan target here, because its value is
308 * determined in part by the fan clock divider. This follows the principle
309 * of least surprise; the user doesn't expect the fan target to change just
310 * because the divider changed.
311 */
312static ssize_t fan1_div_store(struct device *dev, struct device_attribute *da,
313 const char *buf, size_t count)
314{
315 struct emc2103_data *data = emc2103_update_device(dev);
316 struct i2c_client *client = data->client;
317 int new_range_bits, old_div = 8 / data->fan_multiplier;
318 long new_div;
319
320 int status = kstrtol(buf, 10, &new_div);
321 if (status < 0)
322 return status;
323
324 if (new_div == old_div) /* No change */
325 return count;
326
327 switch (new_div) {
328 case 1:
329 new_range_bits = 3;
330 break;
331 case 2:
332 new_range_bits = 2;
333 break;
334 case 4:
335 new_range_bits = 1;
336 break;
337 case 8:
338 new_range_bits = 0;
339 break;
340 default:
341 return -EINVAL;
342 }
343
344 mutex_lock(&data->update_lock);
345
346 status = i2c_smbus_read_byte_data(client, REG_FAN_CONF1);
347 if (status < 0) {
348 dev_dbg(&client->dev, "reg 0x%02x, err %d\n",
349 REG_FAN_CONF1, status);
350 mutex_unlock(&data->update_lock);
351 return status;
352 }
353 status &= 0x9F;
354 status |= (new_range_bits << 5);
355 i2c_smbus_write_byte_data(client, REG_FAN_CONF1, status);
356
357 data->fan_multiplier = 8 / new_div;
358
359 /* update fan target if high byte is not disabled */
360 if ((data->fan_target & 0x1fe0) != 0x1fe0) {
361 u16 new_target = (data->fan_target * old_div) / new_div;
362 data->fan_target = min(new_target, (u16)0x1fff);
363 write_fan_target_to_i2c(client, data->fan_target);
364 }
365
366 /* invalidate data to force re-read from hardware */
367 data->valid = false;
368
369 mutex_unlock(&data->update_lock);
370 return count;
371}
372
373static ssize_t
374fan1_target_show(struct device *dev, struct device_attribute *da, char *buf)
375{
376 struct emc2103_data *data = emc2103_update_device(dev);
377 int rpm = 0;
378
379 /* high byte of 0xff indicates disabled so return 0 */
380 if ((data->fan_target != 0) && ((data->fan_target & 0x1fe0) != 0x1fe0))
381 rpm = (FAN_RPM_FACTOR * data->fan_multiplier)
382 / data->fan_target;
383
384 return sprintf(buf, "%d\n", rpm);
385}
386
387static ssize_t fan1_target_store(struct device *dev,
388 struct device_attribute *da, const char *buf,
389 size_t count)
390{
391 struct emc2103_data *data = emc2103_update_device(dev);
392 struct i2c_client *client = data->client;
393 unsigned long rpm_target;
394
395 int result = kstrtoul(buf, 10, &rpm_target);
396 if (result < 0)
397 return result;
398
399 /* Datasheet states 16384 as maximum RPM target (table 3.2) */
400 rpm_target = clamp_val(rpm_target, 0, 16384);
401
402 mutex_lock(&data->update_lock);
403
404 if (rpm_target == 0)
405 data->fan_target = 0x1fff;
406 else
407 data->fan_target = clamp_val(
408 (FAN_RPM_FACTOR * data->fan_multiplier) / rpm_target,
409 0, 0x1fff);
410
411 write_fan_target_to_i2c(client, data->fan_target);
412
413 mutex_unlock(&data->update_lock);
414 return count;
415}
416
417static ssize_t
418fan1_fault_show(struct device *dev, struct device_attribute *da, char *buf)
419{
420 struct emc2103_data *data = emc2103_update_device(dev);
421 bool fault = ((data->fan_tach & 0x1fe0) == 0x1fe0);
422 return sprintf(buf, "%d\n", fault ? 1 : 0);
423}
424
425static ssize_t
426pwm1_enable_show(struct device *dev, struct device_attribute *da, char *buf)
427{
428 struct emc2103_data *data = emc2103_update_device(dev);
429 return sprintf(buf, "%d\n", data->fan_rpm_control ? 3 : 0);
430}
431
432static ssize_t pwm1_enable_store(struct device *dev,
433 struct device_attribute *da, const char *buf,
434 size_t count)
435{
436 struct emc2103_data *data = dev_get_drvdata(dev);
437 struct i2c_client *client = data->client;
438 long new_value;
439 u8 conf_reg;
440
441 int result = kstrtol(buf, 10, &new_value);
442 if (result < 0)
443 return result;
444
445 mutex_lock(&data->update_lock);
446 switch (new_value) {
447 case 0:
448 data->fan_rpm_control = false;
449 break;
450 case 3:
451 data->fan_rpm_control = true;
452 break;
453 default:
454 count = -EINVAL;
455 goto err;
456 }
457
458 result = read_u8_from_i2c(client, REG_FAN_CONF1, &conf_reg);
459 if (result) {
460 count = result;
461 goto err;
462 }
463
464 if (data->fan_rpm_control)
465 conf_reg |= 0x80;
466 else
467 conf_reg &= ~0x80;
468
469 i2c_smbus_write_byte_data(client, REG_FAN_CONF1, conf_reg);
470err:
471 mutex_unlock(&data->update_lock);
472 return count;
473}
474
475static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0);
476static SENSOR_DEVICE_ATTR_RW(temp1_min, temp_min, 0);
477static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_max, 0);
478static SENSOR_DEVICE_ATTR_RO(temp1_fault, temp_fault, 0);
479static SENSOR_DEVICE_ATTR_RO(temp1_min_alarm, temp_min_alarm, 0);
480static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, temp_max_alarm, 0);
481
482static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1);
483static SENSOR_DEVICE_ATTR_RW(temp2_min, temp_min, 1);
484static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_max, 1);
485static SENSOR_DEVICE_ATTR_RO(temp2_fault, temp_fault, 1);
486static SENSOR_DEVICE_ATTR_RO(temp2_min_alarm, temp_min_alarm, 1);
487static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, temp_max_alarm, 1);
488
489static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 2);
490static SENSOR_DEVICE_ATTR_RW(temp3_min, temp_min, 2);
491static SENSOR_DEVICE_ATTR_RW(temp3_max, temp_max, 2);
492static SENSOR_DEVICE_ATTR_RO(temp3_fault, temp_fault, 2);
493static SENSOR_DEVICE_ATTR_RO(temp3_min_alarm, temp_min_alarm, 2);
494static SENSOR_DEVICE_ATTR_RO(temp3_max_alarm, temp_max_alarm, 2);
495
496static SENSOR_DEVICE_ATTR_RO(temp4_input, temp, 3);
497static SENSOR_DEVICE_ATTR_RW(temp4_min, temp_min, 3);
498static SENSOR_DEVICE_ATTR_RW(temp4_max, temp_max, 3);
499static SENSOR_DEVICE_ATTR_RO(temp4_fault, temp_fault, 3);
500static SENSOR_DEVICE_ATTR_RO(temp4_min_alarm, temp_min_alarm, 3);
501static SENSOR_DEVICE_ATTR_RO(temp4_max_alarm, temp_max_alarm, 3);
502
503static DEVICE_ATTR_RO(fan1_input);
504static DEVICE_ATTR_RW(fan1_div);
505static DEVICE_ATTR_RW(fan1_target);
506static DEVICE_ATTR_RO(fan1_fault);
507
508static DEVICE_ATTR_RW(pwm1_enable);
509
510/* sensors present on all models */
511static struct attribute *emc2103_attributes[] = {
512 &sensor_dev_attr_temp1_input.dev_attr.attr,
513 &sensor_dev_attr_temp1_min.dev_attr.attr,
514 &sensor_dev_attr_temp1_max.dev_attr.attr,
515 &sensor_dev_attr_temp1_fault.dev_attr.attr,
516 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
517 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
518 &sensor_dev_attr_temp2_input.dev_attr.attr,
519 &sensor_dev_attr_temp2_min.dev_attr.attr,
520 &sensor_dev_attr_temp2_max.dev_attr.attr,
521 &sensor_dev_attr_temp2_fault.dev_attr.attr,
522 &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
523 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
524 &dev_attr_fan1_input.attr,
525 &dev_attr_fan1_div.attr,
526 &dev_attr_fan1_target.attr,
527 &dev_attr_fan1_fault.attr,
528 &dev_attr_pwm1_enable.attr,
529 NULL
530};
531
532/* extra temperature sensors only present on 2103-2 and 2103-4 */
533static struct attribute *emc2103_attributes_temp3[] = {
534 &sensor_dev_attr_temp3_input.dev_attr.attr,
535 &sensor_dev_attr_temp3_min.dev_attr.attr,
536 &sensor_dev_attr_temp3_max.dev_attr.attr,
537 &sensor_dev_attr_temp3_fault.dev_attr.attr,
538 &sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
539 &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
540 NULL
541};
542
543/* extra temperature sensors only present on 2103-2 and 2103-4 in APD mode */
544static struct attribute *emc2103_attributes_temp4[] = {
545 &sensor_dev_attr_temp4_input.dev_attr.attr,
546 &sensor_dev_attr_temp4_min.dev_attr.attr,
547 &sensor_dev_attr_temp4_max.dev_attr.attr,
548 &sensor_dev_attr_temp4_fault.dev_attr.attr,
549 &sensor_dev_attr_temp4_min_alarm.dev_attr.attr,
550 &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
551 NULL
552};
553
554static const struct attribute_group emc2103_group = {
555 .attrs = emc2103_attributes,
556};
557
558static const struct attribute_group emc2103_temp3_group = {
559 .attrs = emc2103_attributes_temp3,
560};
561
562static const struct attribute_group emc2103_temp4_group = {
563 .attrs = emc2103_attributes_temp4,
564};
565
566static int
567emc2103_probe(struct i2c_client *client, const struct i2c_device_id *id)
568{
569 struct emc2103_data *data;
570 struct device *hwmon_dev;
571 int status, idx = 0;
572
573 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
574 return -EIO;
575
576 data = devm_kzalloc(&client->dev, sizeof(struct emc2103_data),
577 GFP_KERNEL);
578 if (!data)
579 return -ENOMEM;
580
581 i2c_set_clientdata(client, data);
582 data->client = client;
583 mutex_init(&data->update_lock);
584
585 /* 2103-2 and 2103-4 have 3 external diodes, 2103-1 has 1 */
586 status = i2c_smbus_read_byte_data(client, REG_PRODUCT_ID);
587 if (status == 0x24) {
588 /* 2103-1 only has 1 external diode */
589 data->temp_count = 2;
590 } else {
591 /* 2103-2 and 2103-4 have 3 or 4 external diodes */
592 status = i2c_smbus_read_byte_data(client, REG_CONF1);
593 if (status < 0) {
594 dev_dbg(&client->dev, "reg 0x%02x, err %d\n", REG_CONF1,
595 status);
596 return status;
597 }
598
599 /* detect current state of hardware */
600 data->temp_count = (status & 0x01) ? 4 : 3;
601
602 /* force APD state if module parameter is set */
603 if (apd == 0) {
604 /* force APD mode off */
605 data->temp_count = 3;
606 status &= ~(0x01);
607 i2c_smbus_write_byte_data(client, REG_CONF1, status);
608 } else if (apd == 1) {
609 /* force APD mode on */
610 data->temp_count = 4;
611 status |= 0x01;
612 i2c_smbus_write_byte_data(client, REG_CONF1, status);
613 }
614 }
615
616 /* sysfs hooks */
617 data->groups[idx++] = &emc2103_group;
618 if (data->temp_count >= 3)
619 data->groups[idx++] = &emc2103_temp3_group;
620 if (data->temp_count == 4)
621 data->groups[idx++] = &emc2103_temp4_group;
622
623 hwmon_dev = devm_hwmon_device_register_with_groups(&client->dev,
624 client->name, data,
625 data->groups);
626 if (IS_ERR(hwmon_dev))
627 return PTR_ERR(hwmon_dev);
628
629 dev_info(&client->dev, "%s: sensor '%s'\n",
630 dev_name(hwmon_dev), client->name);
631
632 return 0;
633}
634
635static const struct i2c_device_id emc2103_ids[] = {
636 { "emc2103", 0, },
637 { /* LIST END */ }
638};
639MODULE_DEVICE_TABLE(i2c, emc2103_ids);
640
641/* Return 0 if detection is successful, -ENODEV otherwise */
642static int
643emc2103_detect(struct i2c_client *new_client, struct i2c_board_info *info)
644{
645 struct i2c_adapter *adapter = new_client->adapter;
646 int manufacturer, product;
647
648 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
649 return -ENODEV;
650
651 manufacturer = i2c_smbus_read_byte_data(new_client, REG_MFG_ID);
652 if (manufacturer != 0x5D)
653 return -ENODEV;
654
655 product = i2c_smbus_read_byte_data(new_client, REG_PRODUCT_ID);
656 if ((product != 0x24) && (product != 0x26))
657 return -ENODEV;
658
659 strlcpy(info->type, "emc2103", I2C_NAME_SIZE);
660
661 return 0;
662}
663
664static struct i2c_driver emc2103_driver = {
665 .class = I2C_CLASS_HWMON,
666 .driver = {
667 .name = "emc2103",
668 },
669 .probe = emc2103_probe,
670 .id_table = emc2103_ids,
671 .detect = emc2103_detect,
672 .address_list = normal_i2c,
673};
674
675module_i2c_driver(emc2103_driver);
676
677MODULE_AUTHOR("Steve Glendinning <steve.glendinning@shawell.net>");
678MODULE_DESCRIPTION("SMSC EMC2103 hwmon driver");
679MODULE_LICENSE("GPL");
680