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SG		 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/* 2103-2 and 2103-4's 3rd temperature sensor can be connected to two diodes
52 * in anti-parallel mode, and in this configuration both can be read
53 * independently (so we have 4 temperature inputs). The device can't
54 * detect if it's connected in this mode, so we have to manually enable
55 * it. Default is to leave the device in the state it's already in (-1).
56 * This parameter allows APD mode to be optionally forced on or off */
57static int apd = -1;
58module_param(apd, bool, 0);
59MODULE_PARM_DESC(init, "Set to zero to disable anti-parallel diode mode");
60
61struct temperature {
62 s8 degrees;
63 u8 fraction; /* 0-7 multiples of 0.125 */
64};
65
66struct emc2103_data {
67 struct device *hwmon_dev;
68 struct mutex update_lock;
69 bool valid; /* registers are valid */
70 bool fan_rpm_control;
71 int temp_count; /* num of temp sensors */
72 unsigned long last_updated; /* in jiffies */
73 struct temperature temp[4]; /* internal + 3 external */
74 s8 temp_min[4]; /* no fractional part */
75 s8 temp_max[4]; /* no fractional part */
76 u8 temp_min_alarm;
77 u8 temp_max_alarm;
78 u8 fan_multiplier;
79 u16 fan_tach;
80 u16 fan_target;
81};
82
83static int read_u8_from_i2c(struct i2c_client *client, u8 i2c_reg, u8 *output)
84{
85 int status = i2c_smbus_read_byte_data(client, i2c_reg);
86 if (status < 0) {
87 dev_warn(&client->dev, "reg 0x%02x, err %d\n",
88 i2c_reg, status);
89 } else {
90 *output = status;
91 }
92 return status;
93}
94
95static void read_temp_from_i2c(struct i2c_client *client, u8 i2c_reg,
96 struct temperature *temp)
97{
98 u8 degrees, fractional;
99
100 if (read_u8_from_i2c(client, i2c_reg, &degrees) < 0)
101 return;
102
103 if (read_u8_from_i2c(client, i2c_reg + 1, &fractional) < 0)
104 return;
105
106 temp->degrees = degrees;
107 temp->fraction = (fractional & 0xe0) >> 5;
108}
109
110static void read_fan_from_i2c(struct i2c_client *client, u16 *output,
111 u8 hi_addr, u8 lo_addr)
112{
113 u8 high_byte, lo_byte;
114
115 if (read_u8_from_i2c(client, hi_addr, &high_byte) < 0)
116 return;
117
118 if (read_u8_from_i2c(client, lo_addr, &lo_byte) < 0)
119 return;
120
121 *output = ((u16)high_byte << 5) | (lo_byte >> 3);
122}
123
124static void write_fan_target_to_i2c(struct i2c_client *client, u16 new_target)
125{
126 u8 high_byte = (new_target & 0x1fe0) >> 5;
127 u8 low_byte = (new_target & 0x001f) << 3;
128 i2c_smbus_write_byte_data(client, REG_FAN_TARGET_LO, low_byte);
129 i2c_smbus_write_byte_data(client, REG_FAN_TARGET_HI, high_byte);
130}
131
132static void read_fan_config_from_i2c(struct i2c_client *client)
133
134{
135 struct emc2103_data *data = i2c_get_clientdata(client);
136 u8 conf1;
137
138 if (read_u8_from_i2c(client, REG_FAN_CONF1, &conf1) < 0)
139 return;
140
141 data->fan_multiplier = 1 << ((conf1 & 0x60) >> 5);
142 data->fan_rpm_control = (conf1 & 0x80) != 0;
143}
144
145static struct emc2103_data *emc2103_update_device(struct device *dev)
146{
147 struct i2c_client *client = to_i2c_client(dev);
148 struct emc2103_data *data = i2c_get_clientdata(client);
149
150 mutex_lock(&data->update_lock);
151
152 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
153 || !data->valid) {
154 int i;
155
156 for (i = 0; i < data->temp_count; i++) {
157 read_temp_from_i2c(client, REG_TEMP[i], &data->temp[i]);
158 read_u8_from_i2c(client, REG_TEMP_MIN[i],
159 &data->temp_min[i]);
160 read_u8_from_i2c(client, REG_TEMP_MAX[i],
161 &data->temp_max[i]);
162 }
163
164 read_u8_from_i2c(client, REG_TEMP_MIN_ALARM,
165 &data->temp_min_alarm);
166 read_u8_from_i2c(client, REG_TEMP_MAX_ALARM,
167 &data->temp_max_alarm);
168
169 read_fan_from_i2c(client, &data->fan_tach,
170 REG_FAN_TACH_HI, REG_FAN_TACH_LO);
171 read_fan_from_i2c(client, &data->fan_target,
172 REG_FAN_TARGET_HI, REG_FAN_TARGET_LO);
173 read_fan_config_from_i2c(client);
174
175 data->last_updated = jiffies;
176 data->valid = true;
177 }
178
179 mutex_unlock(&data->update_lock);
180
181 return data;
182}
183
184static ssize_t
185show_temp(struct device *dev, struct device_attribute *da, char *buf)
186{
187 int nr = to_sensor_dev_attr(da)->index;
188 struct emc2103_data *data = emc2103_update_device(dev);
189 int millidegrees = data->temp[nr].degrees * 1000
190 + data->temp[nr].fraction * 125;
191 return sprintf(buf, "%d\n", millidegrees);
192}
193
194static ssize_t
195show_temp_min(struct device *dev, struct device_attribute *da, char *buf)
196{
197 int nr = to_sensor_dev_attr(da)->index;
198 struct emc2103_data *data = emc2103_update_device(dev);
199 int millidegrees = data->temp_min[nr] * 1000;
200 return sprintf(buf, "%d\n", millidegrees);
201}
202
203static ssize_t
204show_temp_max(struct device *dev, struct device_attribute *da, char *buf)
205{
206 int nr = to_sensor_dev_attr(da)->index;
207 struct emc2103_data *data = emc2103_update_device(dev);
208 int millidegrees = data->temp_max[nr] * 1000;
209 return sprintf(buf, "%d\n", millidegrees);
210}
211
212static ssize_t
213show_temp_fault(struct device *dev, struct device_attribute *da, char *buf)
214{
215 int nr = to_sensor_dev_attr(da)->index;
216 struct emc2103_data *data = emc2103_update_device(dev);
217 bool fault = (data->temp[nr].degrees == -128);
218 return sprintf(buf, "%d\n", fault ? 1 : 0);
219}
220
221static ssize_t
222show_temp_min_alarm(struct device *dev, struct device_attribute *da, char *buf)
223{
224 int nr = to_sensor_dev_attr(da)->index;
225 struct emc2103_data *data = emc2103_update_device(dev);
226 bool alarm = data->temp_min_alarm & (1 << nr);
227 return sprintf(buf, "%d\n", alarm ? 1 : 0);
228}
229
230static ssize_t
231show_temp_max_alarm(struct device *dev, struct device_attribute *da, char *buf)
232{
233 int nr = to_sensor_dev_attr(da)->index;
234 struct emc2103_data *data = emc2103_update_device(dev);
235 bool alarm = data->temp_max_alarm & (1 << nr);
236 return sprintf(buf, "%d\n", alarm ? 1 : 0);
237}
238
239static ssize_t set_temp_min(struct device *dev, struct device_attribute *da,
240 const char *buf, size_t count)
241{
242 int nr = to_sensor_dev_attr(da)->index;
243 struct i2c_client *client = to_i2c_client(dev);
244 struct emc2103_data *data = i2c_get_clientdata(client);
245 long val;
246
247 int result = strict_strtol(buf, 10, &val);
248 if (result < 0)
249 return -EINVAL;
250
251 val = DIV_ROUND_CLOSEST(val, 1000);
252 if ((val < -63) || (val > 127))
253 return -EINVAL;
254
255 mutex_lock(&data->update_lock);
256 data->temp_min[nr] = val;
257 i2c_smbus_write_byte_data(client, REG_TEMP_MIN[nr], val);
258 mutex_unlock(&data->update_lock);
259
260 return count;
261}
262
263static ssize_t set_temp_max(struct device *dev, struct device_attribute *da,
264 const char *buf, size_t count)
265{
266 int nr = to_sensor_dev_attr(da)->index;
267 struct i2c_client *client = to_i2c_client(dev);
268 struct emc2103_data *data = i2c_get_clientdata(client);
269 long val;
270
271 int result = strict_strtol(buf, 10, &val);
272 if (result < 0)
273 return -EINVAL;
274
275 val = DIV_ROUND_CLOSEST(val, 1000);
276 if ((val < -63) || (val > 127))
277 return -EINVAL;
278
279 mutex_lock(&data->update_lock);
280 data->temp_max[nr] = val;
281 i2c_smbus_write_byte_data(client, REG_TEMP_MAX[nr], val);
282 mutex_unlock(&data->update_lock);
283
284 return count;
285}
286
287static ssize_t
288show_fan(struct device *dev, struct device_attribute *da, char *buf)
289{
290 struct emc2103_data *data = emc2103_update_device(dev);
291 int rpm = 0;
292 if (data->fan_tach != 0)
293 rpm = (FAN_RPM_FACTOR * data->fan_multiplier) / data->fan_tach;
294 return sprintf(buf, "%d\n", rpm);
295}
296
297static ssize_t
298show_fan_div(struct device *dev, struct device_attribute *da, char *buf)
299{
300 struct emc2103_data *data = emc2103_update_device(dev);
301 int fan_div = 8 / data->fan_multiplier;
302 return sprintf(buf, "%d\n", fan_div);
303}
304
305/* Note: we also update the fan target here, because its value is
306 determined in part by the fan clock divider. This follows the principle
307 of least surprise; the user doesn't expect the fan target to change just
308 because the divider changed. */
309static ssize_t set_fan_div(struct device *dev, struct device_attribute *da,
310 const char *buf, size_t count)
311{
312 struct emc2103_data *data = emc2103_update_device(dev);
313 struct i2c_client *client = to_i2c_client(dev);
314 int new_range_bits, old_div = 8 / data->fan_multiplier;
315 long new_div;
316
317 int status = strict_strtol(buf, 10, &new_div);
318 if (status < 0)
319 return -EINVAL;
320
321 if (new_div == old_div) /* No change */
322 return count;
323
324 switch (new_div) {
325 case 1:
326 new_range_bits = 3;
327 break;
328 case 2:
329 new_range_bits = 2;
330 break;
331 case 4:
332 new_range_bits = 1;
333 break;
334 case 8:
335 new_range_bits = 0;
336 break;
337 default:
338 return -EINVAL;
339 }
340
341 mutex_lock(&data->update_lock);
342
343 status = i2c_smbus_read_byte_data(client, REG_FAN_CONF1);
344 if (status < 0) {
345 dev_dbg(&client->dev, "reg 0x%02x, err %d\n",
346 REG_FAN_CONF1, status);
347 mutex_unlock(&data->update_lock);
348 return -EIO;
349 }
350 status &= 0x9F;
351 status |= (new_range_bits << 5);
352 i2c_smbus_write_byte_data(client, REG_FAN_CONF1, status);
353
354 data->fan_multiplier = 8 / new_div;
355
356 /* update fan target if high byte is not disabled */
357 if ((data->fan_target & 0x1fe0) != 0x1fe0) {
358 u16 new_target = (data->fan_target * old_div) / new_div;
359 data->fan_target = min(new_target, (u16)0x1fff);
360 write_fan_target_to_i2c(client, data->fan_target);
361 }
362
363 /* invalidate data to force re-read from hardware */
364 data->valid = false;
365
366 mutex_unlock(&data->update_lock);
367 return count;
368}
369
370static ssize_t
371show_fan_target(struct device *dev, struct device_attribute *da, char *buf)
372{
373 struct emc2103_data *data = emc2103_update_device(dev);
374 int rpm = 0;
375
376 /* high byte of 0xff indicates disabled so return 0 */
377 if ((data->fan_target != 0) && ((data->fan_target & 0x1fe0) != 0x1fe0))
378 rpm = (FAN_RPM_FACTOR * data->fan_multiplier)
379 / data->fan_target;
380
381 return sprintf(buf, "%d\n", rpm);
382}
383
384static ssize_t set_fan_target(struct device *dev, struct device_attribute *da,
385 const char *buf, size_t count)
386{
387 struct emc2103_data *data = emc2103_update_device(dev);
388 struct i2c_client *client = to_i2c_client(dev);
389 long rpm_target;
390
391 int result = strict_strtol(buf, 10, &rpm_target);
392 if (result < 0)
393 return -EINVAL;
394
395 /* Datasheet states 16384 as maximum RPM target (table 3.2) */
396 if ((rpm_target < 0) || (rpm_target > 16384))
397 return -EINVAL;
398
399 mutex_lock(&data->update_lock);
400
401 if (rpm_target == 0)
402 data->fan_target = 0x1fff;
403 else
404 data->fan_target = SENSORS_LIMIT(
405 (FAN_RPM_FACTOR * data->fan_multiplier) / rpm_target,
406 0, 0x1fff);
407
408 write_fan_target_to_i2c(client, data->fan_target);
409
410 mutex_unlock(&data->update_lock);
411 return count;
412}
413
414static ssize_t
415show_fan_fault(struct device *dev, struct device_attribute *da, char *buf)
416{
417 struct emc2103_data *data = emc2103_update_device(dev);
418 bool fault = ((data->fan_tach & 0x1fe0) == 0x1fe0);
419 return sprintf(buf, "%d\n", fault ? 1 : 0);
420}
421
422static ssize_t
423show_pwm_enable(struct device *dev, struct device_attribute *da, char *buf)
424{
425 struct emc2103_data *data = emc2103_update_device(dev);
426 return sprintf(buf, "%d\n", data->fan_rpm_control ? 3 : 0);
427}
428
429static ssize_t set_pwm_enable(struct device *dev, struct device_attribute *da,
430 const char *buf, size_t count)
431{
432 struct i2c_client *client = to_i2c_client(dev);
433 struct emc2103_data *data = i2c_get_clientdata(client);
434 long new_value;
435 u8 conf_reg;
436
437 int result = strict_strtol(buf, 10, &new_value);
438 if (result < 0)
439 return -EINVAL;
440
441 mutex_lock(&data->update_lock);
442 switch (new_value) {
443 case 0:
444 data->fan_rpm_control = false;
445 break;
446 case 3:
447 data->fan_rpm_control = true;
448 break;
449 default:
450 mutex_unlock(&data->update_lock);
451 return -EINVAL;
452 }
453
454 read_u8_from_i2c(client, REG_FAN_CONF1, &conf_reg);
455
456 if (data->fan_rpm_control)
457 conf_reg |= 0x80;
458 else
459 conf_reg &= ~0x80;
460
461 i2c_smbus_write_byte_data(client, REG_FAN_CONF1, conf_reg);
462
463 mutex_unlock(&data->update_lock);
464 return count;
465}
466
467static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
468static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO | S_IWUSR, show_temp_min,
469 set_temp_min, 0);
470static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, show_temp_max,
471 set_temp_max, 0);
472static SENSOR_DEVICE_ATTR(temp1_fault, S_IRUGO, show_temp_fault, NULL, 0);
473static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_temp_min_alarm,
474 NULL, 0);
475static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_temp_max_alarm,
476 NULL, 0);
477
478static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
479static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO | S_IWUSR, show_temp_min,
480 set_temp_min, 1);
481static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO | S_IWUSR, show_temp_max,
482 set_temp_max, 1);
483static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_temp_fault, NULL, 1);
484static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_temp_min_alarm,
485 NULL, 1);
486static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_temp_max_alarm,
487 NULL, 1);
488
489static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
490static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO | S_IWUSR, show_temp_min,
491 set_temp_min, 2);
492static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO | S_IWUSR, show_temp_max,
493 set_temp_max, 2);
494static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_temp_fault, NULL, 2);
495static SENSOR_DEVICE_ATTR(temp3_min_alarm, S_IRUGO, show_temp_min_alarm,
496 NULL, 2);
497static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_temp_max_alarm,
498 NULL, 2);
499
500static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
501static SENSOR_DEVICE_ATTR(temp4_min, S_IRUGO | S_IWUSR, show_temp_min,
502 set_temp_min, 3);
503static SENSOR_DEVICE_ATTR(temp4_max, S_IRUGO | S_IWUSR, show_temp_max,
504 set_temp_max, 3);
505static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_temp_fault, NULL, 3);
506static SENSOR_DEVICE_ATTR(temp4_min_alarm, S_IRUGO, show_temp_min_alarm,
507 NULL, 3);
508static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_temp_max_alarm,
509 NULL, 3);
510
511static DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL);
512static DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR, show_fan_div, set_fan_div);
513static DEVICE_ATTR(fan1_target, S_IRUGO | S_IWUSR, show_fan_target,
514 set_fan_target);
515static DEVICE_ATTR(fan1_fault, S_IRUGO, show_fan_fault, NULL);
516
517static DEVICE_ATTR(pwm1_enable, S_IRUGO | S_IWUSR, show_pwm_enable,
518 set_pwm_enable);
519
520/* sensors present on all models */
521static struct attribute *emc2103_attributes[] = {
522 &sensor_dev_attr_temp1_input.dev_attr.attr,
523 &sensor_dev_attr_temp1_min.dev_attr.attr,
524 &sensor_dev_attr_temp1_max.dev_attr.attr,
525 &sensor_dev_attr_temp1_fault.dev_attr.attr,
526 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
527 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
528 &sensor_dev_attr_temp2_input.dev_attr.attr,
529 &sensor_dev_attr_temp2_min.dev_attr.attr,
530 &sensor_dev_attr_temp2_max.dev_attr.attr,
531 &sensor_dev_attr_temp2_fault.dev_attr.attr,
532 &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
533 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
534 &dev_attr_fan1_input.attr,
535 &dev_attr_fan1_div.attr,
536 &dev_attr_fan1_target.attr,
537 &dev_attr_fan1_fault.attr,
538 &dev_attr_pwm1_enable.attr,
539 NULL
540};
541
542/* extra temperature sensors only present on 2103-2 and 2103-4 */
543static struct attribute *emc2103_attributes_temp3[] = {
544 &sensor_dev_attr_temp3_input.dev_attr.attr,
545 &sensor_dev_attr_temp3_min.dev_attr.attr,
546 &sensor_dev_attr_temp3_max.dev_attr.attr,
547 &sensor_dev_attr_temp3_fault.dev_attr.attr,
548 &sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
549 &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
550 NULL
551};
552
553/* extra temperature sensors only present on 2103-2 and 2103-4 in APD mode */
554static struct attribute *emc2103_attributes_temp4[] = {
555 &sensor_dev_attr_temp4_input.dev_attr.attr,
556 &sensor_dev_attr_temp4_min.dev_attr.attr,
557 &sensor_dev_attr_temp4_max.dev_attr.attr,
558 &sensor_dev_attr_temp4_fault.dev_attr.attr,
559 &sensor_dev_attr_temp4_min_alarm.dev_attr.attr,
560 &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
561 NULL
562};
563
564static const struct attribute_group emc2103_group = {
565 .attrs = emc2103_attributes,
566};
567
568static const struct attribute_group emc2103_temp3_group = {
569 .attrs = emc2103_attributes_temp3,
570};
571
572static const struct attribute_group emc2103_temp4_group = {
573 .attrs = emc2103_attributes_temp4,
574};
575
576static int
577emc2103_probe(struct i2c_client *client, const struct i2c_device_id *id)
578{
579 struct emc2103_data *data;
580 int status;
581
582 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
583 return -EIO;
584
585 data = kzalloc(sizeof(struct emc2103_data), GFP_KERNEL);
586 if (!data)
587 return -ENOMEM;
588
589 i2c_set_clientdata(client, data);
590 mutex_init(&data->update_lock);
591
592 /* 2103-2 and 2103-4 have 3 external diodes, 2103-1 has 1 */
593 status = i2c_smbus_read_byte_data(client, REG_PRODUCT_ID);
594 if (status == 0x24) {
595 /* 2103-1 only has 1 external diode */
596 data->temp_count = 2;
597 } else {
598 /* 2103-2 and 2103-4 have 3 or 4 external diodes */
599 status = i2c_smbus_read_byte_data(client, REG_CONF1);
600 if (status < 0) {
601 dev_dbg(&client->dev, "reg 0x%02x, err %d\n", REG_CONF1,
602 status);
603 goto exit_free;
604 }
605
606 /* detect current state of hardware */
607 data->temp_count = (status & 0x01) ? 4 : 3;
608
609 /* force APD state if module parameter is set */
610 if (apd == 0) {
611 /* force APD mode off */
612 data->temp_count = 3;
613 status &= ~(0x01);
614 i2c_smbus_write_byte_data(client, REG_CONF1, status);
615 } else if (apd == 1) {
616 /* force APD mode on */
617 data->temp_count = 4;
618 status |= 0x01;
619 i2c_smbus_write_byte_data(client, REG_CONF1, status);
620 }
621 }
622
623 /* Register sysfs hooks */
624 status = sysfs_create_group(&client->dev.kobj, &emc2103_group);
625 if (status)
626 goto exit_free;
627
628 if (data->temp_count >= 3) {
629 status = sysfs_create_group(&client->dev.kobj,
630 &emc2103_temp3_group);
631 if (status)
632 goto exit_remove;
633 }
634
635 if (data->temp_count == 4) {
636 status = sysfs_create_group(&client->dev.kobj,
637 &emc2103_temp4_group);
638 if (status)
639 goto exit_remove_temp3;
640 }
641
642 data->hwmon_dev = hwmon_device_register(&client->dev);
643 if (IS_ERR(data->hwmon_dev)) {
644 status = PTR_ERR(data->hwmon_dev);
645 goto exit_remove_temp4;
646 }
647
648 dev_info(&client->dev, "%s: sensor '%s'\n",
649 dev_name(data->hwmon_dev), client->name);
650
651 return 0;
652
653exit_remove_temp4:
654 if (data->temp_count == 4)
655 sysfs_remove_group(&client->dev.kobj, &emc2103_temp4_group);
656exit_remove_temp3:
657 if (data->temp_count >= 3)
658 sysfs_remove_group(&client->dev.kobj, &emc2103_temp3_group);
659exit_remove:
660 sysfs_remove_group(&client->dev.kobj, &emc2103_group);
661exit_free:
662 kfree(data);
663 return status;
664}
665
666static int emc2103_remove(struct i2c_client *client)
667{
668 struct emc2103_data *data = i2c_get_clientdata(client);
669
670 hwmon_device_unregister(data->hwmon_dev);
671
672 if (data->temp_count == 4)
673 sysfs_remove_group(&client->dev.kobj, &emc2103_temp4_group);
674
675 if (data->temp_count >= 3)
676 sysfs_remove_group(&client->dev.kobj, &emc2103_temp3_group);
677
678 sysfs_remove_group(&client->dev.kobj, &emc2103_group);
679
680 kfree(data);
681 return 0;
682}
683
684static const struct i2c_device_id emc2103_ids[] = {
685 { "emc2103", 0, },
686 { /* LIST END */ }
687};
688MODULE_DEVICE_TABLE(i2c, emc2103_ids);
689
690/* Return 0 if detection is successful, -ENODEV otherwise */
691static int
692emc2103_detect(struct i2c_client *new_client, struct i2c_board_info *info)
693{
694 struct i2c_adapter *adapter = new_client->adapter;
695 int manufacturer, product;
696
697 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
698 return -ENODEV;
699
700 manufacturer = i2c_smbus_read_byte_data(new_client, REG_MFG_ID);
701 if (manufacturer != 0x5D)
702 return -ENODEV;
703
704 product = i2c_smbus_read_byte_data(new_client, REG_PRODUCT_ID);
705 if ((product != 0x24) && (product != 0x26))
706 return -ENODEV;
707
708 strlcpy(info->type, "emc2103", I2C_NAME_SIZE);
709
710 return 0;
711}
712
713static struct i2c_driver emc2103_driver = {
714 .class = I2C_CLASS_HWMON,
715 .driver = {
716 .name = "emc2103",
717 },
718 .probe = emc2103_probe,
719 .remove = emc2103_remove,
720 .id_table = emc2103_ids,
721 .detect = emc2103_detect,
722 .address_list = normal_i2c,
723};
724
725static int __init sensors_emc2103_init(void)
726{
727 return i2c_add_driver(&emc2103_driver);
728}
729
730static void __exit sensors_emc2103_exit(void)
731{
732 i2c_del_driver(&emc2103_driver);
733}
734
735MODULE_AUTHOR("Steve Glendinning <steve.glendinning@smsc.com>");
736MODULE_DESCRIPTION("SMSC EMC2103 hwmon driver");
737MODULE_LICENSE("GPL");
738
739module_init(sensors_emc2103_init);
740module_exit(sensors_emc2103_exit);
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