2 * emc6w201.c - Hardware monitoring driver for the SMSC EMC6W201
3 * Copyright (C) 2011 Jean Delvare <jdelvare@suse.de>
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.
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.
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.
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>
34 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
37 * The EMC6W201 registers
40 #define EMC6W201_REG_IN(nr) (0x20 + (nr))
41 #define EMC6W201_REG_TEMP(nr) (0x26 + (nr))
42 #define EMC6W201_REG_FAN(nr) (0x2C + (nr) * 2)
43 #define EMC6W201_REG_COMPANY 0x3E
44 #define EMC6W201_REG_VERSTEP 0x3F
45 #define EMC6W201_REG_CONFIG 0x40
46 #define EMC6W201_REG_IN_LOW(nr) (0x4A + (nr) * 2)
47 #define EMC6W201_REG_IN_HIGH(nr) (0x4B + (nr) * 2)
48 #define EMC6W201_REG_TEMP_LOW(nr) (0x56 + (nr) * 2)
49 #define EMC6W201_REG_TEMP_HIGH(nr) (0x57 + (nr) * 2)
50 #define EMC6W201_REG_FAN_MIN(nr) (0x62 + (nr) * 2)
52 enum subfeature { input, min, max };
58 struct emc6w201_data {
59 struct i2c_client *client;
60 struct mutex update_lock;
61 char valid; /* zero until following fields are valid */
62 unsigned long last_updated; /* in jiffies */
64 /* registers values */
71 * Combine LSB and MSB registers in a single value
72 * Locking: must be called with data->update_lock held
74 static u16 emc6w201_read16(struct i2c_client *client, u8 reg)
78 lsb = i2c_smbus_read_byte_data(client, reg);
79 msb = i2c_smbus_read_byte_data(client, reg + 1);
80 if (unlikely(lsb < 0 || msb < 0)) {
81 dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n",
83 return 0xFFFF; /* Arbitrary value */
86 return (msb << 8) | lsb;
90 * Write 16-bit value to LSB and MSB registers
91 * Locking: must be called with data->update_lock held
93 static int emc6w201_write16(struct i2c_client *client, u8 reg, u16 val)
97 err = i2c_smbus_write_byte_data(client, reg, val & 0xff);
99 err = i2c_smbus_write_byte_data(client, reg + 1, val >> 8);
100 if (unlikely(err < 0))
101 dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n",
107 /* Read 8-bit value from register */
108 static u8 emc6w201_read8(struct i2c_client *client, u8 reg)
112 val = i2c_smbus_read_byte_data(client, reg);
113 if (unlikely(val < 0)) {
114 dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n",
116 return 0x00; /* Arbitrary value */
122 /* Write 8-bit value to register */
123 static int emc6w201_write8(struct i2c_client *client, u8 reg, u8 val)
127 err = i2c_smbus_write_byte_data(client, reg, val);
128 if (unlikely(err < 0))
129 dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n",
135 static struct emc6w201_data *emc6w201_update_device(struct device *dev)
137 struct emc6w201_data *data = dev_get_drvdata(dev);
138 struct i2c_client *client = data->client;
141 mutex_lock(&data->update_lock);
143 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
144 for (nr = 0; nr < 6; nr++) {
145 data->in[input][nr] =
146 emc6w201_read8(client,
147 EMC6W201_REG_IN(nr));
149 emc6w201_read8(client,
150 EMC6W201_REG_IN_LOW(nr));
152 emc6w201_read8(client,
153 EMC6W201_REG_IN_HIGH(nr));
156 for (nr = 0; nr < 6; nr++) {
157 data->temp[input][nr] =
158 emc6w201_read8(client,
159 EMC6W201_REG_TEMP(nr));
160 data->temp[min][nr] =
161 emc6w201_read8(client,
162 EMC6W201_REG_TEMP_LOW(nr));
163 data->temp[max][nr] =
164 emc6w201_read8(client,
165 EMC6W201_REG_TEMP_HIGH(nr));
168 for (nr = 0; nr < 5; nr++) {
169 data->fan[input][nr] =
170 emc6w201_read16(client,
171 EMC6W201_REG_FAN(nr));
173 emc6w201_read16(client,
174 EMC6W201_REG_FAN_MIN(nr));
177 data->last_updated = jiffies;
181 mutex_unlock(&data->update_lock);
187 * Sysfs callback functions
190 static const s16 nominal_mv[6] = { 2500, 1500, 3300, 5000, 1500, 1500 };
192 static ssize_t show_in(struct device *dev, struct device_attribute *devattr,
195 struct emc6w201_data *data = emc6w201_update_device(dev);
196 int sf = to_sensor_dev_attr_2(devattr)->index;
197 int nr = to_sensor_dev_attr_2(devattr)->nr;
199 return sprintf(buf, "%u\n",
200 (unsigned)data->in[sf][nr] * nominal_mv[nr] / 0xC0);
203 static ssize_t set_in(struct device *dev, struct device_attribute *devattr,
204 const char *buf, size_t count)
206 struct emc6w201_data *data = dev_get_drvdata(dev);
207 struct i2c_client *client = data->client;
208 int sf = to_sensor_dev_attr_2(devattr)->index;
209 int nr = to_sensor_dev_attr_2(devattr)->nr;
214 err = kstrtol(buf, 10, &val);
218 val = DIV_ROUND_CLOSEST(val * 0xC0, nominal_mv[nr]);
219 reg = (sf == min) ? EMC6W201_REG_IN_LOW(nr)
220 : EMC6W201_REG_IN_HIGH(nr);
222 mutex_lock(&data->update_lock);
223 data->in[sf][nr] = clamp_val(val, 0, 255);
224 err = emc6w201_write8(client, reg, data->in[sf][nr]);
225 mutex_unlock(&data->update_lock);
227 return err < 0 ? err : count;
230 static ssize_t show_temp(struct device *dev, struct device_attribute *devattr,
233 struct emc6w201_data *data = emc6w201_update_device(dev);
234 int sf = to_sensor_dev_attr_2(devattr)->index;
235 int nr = to_sensor_dev_attr_2(devattr)->nr;
237 return sprintf(buf, "%d\n", (int)data->temp[sf][nr] * 1000);
240 static ssize_t set_temp(struct device *dev, struct device_attribute *devattr,
241 const char *buf, size_t count)
243 struct emc6w201_data *data = dev_get_drvdata(dev);
244 struct i2c_client *client = data->client;
245 int sf = to_sensor_dev_attr_2(devattr)->index;
246 int nr = to_sensor_dev_attr_2(devattr)->nr;
251 err = kstrtol(buf, 10, &val);
255 val = DIV_ROUND_CLOSEST(val, 1000);
256 reg = (sf == min) ? EMC6W201_REG_TEMP_LOW(nr)
257 : EMC6W201_REG_TEMP_HIGH(nr);
259 mutex_lock(&data->update_lock);
260 data->temp[sf][nr] = clamp_val(val, -127, 127);
261 err = emc6w201_write8(client, reg, data->temp[sf][nr]);
262 mutex_unlock(&data->update_lock);
264 return err < 0 ? err : count;
267 static ssize_t show_fan(struct device *dev, struct device_attribute *devattr,
270 struct emc6w201_data *data = emc6w201_update_device(dev);
271 int sf = to_sensor_dev_attr_2(devattr)->index;
272 int nr = to_sensor_dev_attr_2(devattr)->nr;
275 if (data->fan[sf][nr] == 0 || data->fan[sf][nr] == 0xFFFF)
278 rpm = 5400000U / data->fan[sf][nr];
280 return sprintf(buf, "%u\n", rpm);
283 static ssize_t set_fan(struct device *dev, struct device_attribute *devattr,
284 const char *buf, size_t count)
286 struct emc6w201_data *data = dev_get_drvdata(dev);
287 struct i2c_client *client = data->client;
288 int sf = to_sensor_dev_attr_2(devattr)->index;
289 int nr = to_sensor_dev_attr_2(devattr)->nr;
293 err = kstrtoul(buf, 10, &val);
300 val = DIV_ROUND_CLOSEST(5400000U, val);
301 val = clamp_val(val, 0, 0xFFFE);
304 mutex_lock(&data->update_lock);
305 data->fan[sf][nr] = val;
306 err = emc6w201_write16(client, EMC6W201_REG_FAN_MIN(nr),
308 mutex_unlock(&data->update_lock);
310 return err < 0 ? err : count;
313 static SENSOR_DEVICE_ATTR_2(in0_input, S_IRUGO, show_in, NULL, 0, input);
314 static SENSOR_DEVICE_ATTR_2(in0_min, S_IRUGO | S_IWUSR, show_in, set_in,
316 static SENSOR_DEVICE_ATTR_2(in0_max, S_IRUGO | S_IWUSR, show_in, set_in,
318 static SENSOR_DEVICE_ATTR_2(in1_input, S_IRUGO, show_in, NULL, 1, input);
319 static SENSOR_DEVICE_ATTR_2(in1_min, S_IRUGO | S_IWUSR, show_in, set_in,
321 static SENSOR_DEVICE_ATTR_2(in1_max, S_IRUGO | S_IWUSR, show_in, set_in,
323 static SENSOR_DEVICE_ATTR_2(in2_input, S_IRUGO, show_in, NULL, 2, input);
324 static SENSOR_DEVICE_ATTR_2(in2_min, S_IRUGO | S_IWUSR, show_in, set_in,
326 static SENSOR_DEVICE_ATTR_2(in2_max, S_IRUGO | S_IWUSR, show_in, set_in,
328 static SENSOR_DEVICE_ATTR_2(in3_input, S_IRUGO, show_in, NULL, 3, input);
329 static SENSOR_DEVICE_ATTR_2(in3_min, S_IRUGO | S_IWUSR, show_in, set_in,
331 static SENSOR_DEVICE_ATTR_2(in3_max, S_IRUGO | S_IWUSR, show_in, set_in,
333 static SENSOR_DEVICE_ATTR_2(in4_input, S_IRUGO, show_in, NULL, 4, input);
334 static SENSOR_DEVICE_ATTR_2(in4_min, S_IRUGO | S_IWUSR, show_in, set_in,
336 static SENSOR_DEVICE_ATTR_2(in4_max, S_IRUGO | S_IWUSR, show_in, set_in,
338 static SENSOR_DEVICE_ATTR_2(in5_input, S_IRUGO, show_in, NULL, 5, input);
339 static SENSOR_DEVICE_ATTR_2(in5_min, S_IRUGO | S_IWUSR, show_in, set_in,
341 static SENSOR_DEVICE_ATTR_2(in5_max, S_IRUGO | S_IWUSR, show_in, set_in,
344 static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, input);
345 static SENSOR_DEVICE_ATTR_2(temp1_min, S_IRUGO | S_IWUSR, show_temp, set_temp,
347 static SENSOR_DEVICE_ATTR_2(temp1_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
349 static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 1, input);
350 static SENSOR_DEVICE_ATTR_2(temp2_min, S_IRUGO | S_IWUSR, show_temp, set_temp,
352 static SENSOR_DEVICE_ATTR_2(temp2_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
354 static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 2, input);
355 static SENSOR_DEVICE_ATTR_2(temp3_min, S_IRUGO | S_IWUSR, show_temp, set_temp,
357 static SENSOR_DEVICE_ATTR_2(temp3_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
359 static SENSOR_DEVICE_ATTR_2(temp4_input, S_IRUGO, show_temp, NULL, 3, input);
360 static SENSOR_DEVICE_ATTR_2(temp4_min, S_IRUGO | S_IWUSR, show_temp, set_temp,
362 static SENSOR_DEVICE_ATTR_2(temp4_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
364 static SENSOR_DEVICE_ATTR_2(temp5_input, S_IRUGO, show_temp, NULL, 4, input);
365 static SENSOR_DEVICE_ATTR_2(temp5_min, S_IRUGO | S_IWUSR, show_temp, set_temp,
367 static SENSOR_DEVICE_ATTR_2(temp5_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
369 static SENSOR_DEVICE_ATTR_2(temp6_input, S_IRUGO, show_temp, NULL, 5, input);
370 static SENSOR_DEVICE_ATTR_2(temp6_min, S_IRUGO | S_IWUSR, show_temp, set_temp,
372 static SENSOR_DEVICE_ATTR_2(temp6_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
375 static SENSOR_DEVICE_ATTR_2(fan1_input, S_IRUGO, show_fan, NULL, 0, input);
376 static SENSOR_DEVICE_ATTR_2(fan1_min, S_IRUGO | S_IWUSR, show_fan, set_fan,
378 static SENSOR_DEVICE_ATTR_2(fan2_input, S_IRUGO, show_fan, NULL, 1, input);
379 static SENSOR_DEVICE_ATTR_2(fan2_min, S_IRUGO | S_IWUSR, show_fan, set_fan,
381 static SENSOR_DEVICE_ATTR_2(fan3_input, S_IRUGO, show_fan, NULL, 2, input);
382 static SENSOR_DEVICE_ATTR_2(fan3_min, S_IRUGO | S_IWUSR, show_fan, set_fan,
384 static SENSOR_DEVICE_ATTR_2(fan4_input, S_IRUGO, show_fan, NULL, 3, input);
385 static SENSOR_DEVICE_ATTR_2(fan4_min, S_IRUGO | S_IWUSR, show_fan, set_fan,
387 static SENSOR_DEVICE_ATTR_2(fan5_input, S_IRUGO, show_fan, NULL, 4, input);
388 static SENSOR_DEVICE_ATTR_2(fan5_min, S_IRUGO | S_IWUSR, show_fan, set_fan,
391 static struct attribute *emc6w201_attrs[] = {
392 &sensor_dev_attr_in0_input.dev_attr.attr,
393 &sensor_dev_attr_in0_min.dev_attr.attr,
394 &sensor_dev_attr_in0_max.dev_attr.attr,
395 &sensor_dev_attr_in1_input.dev_attr.attr,
396 &sensor_dev_attr_in1_min.dev_attr.attr,
397 &sensor_dev_attr_in1_max.dev_attr.attr,
398 &sensor_dev_attr_in2_input.dev_attr.attr,
399 &sensor_dev_attr_in2_min.dev_attr.attr,
400 &sensor_dev_attr_in2_max.dev_attr.attr,
401 &sensor_dev_attr_in3_input.dev_attr.attr,
402 &sensor_dev_attr_in3_min.dev_attr.attr,
403 &sensor_dev_attr_in3_max.dev_attr.attr,
404 &sensor_dev_attr_in4_input.dev_attr.attr,
405 &sensor_dev_attr_in4_min.dev_attr.attr,
406 &sensor_dev_attr_in4_max.dev_attr.attr,
407 &sensor_dev_attr_in5_input.dev_attr.attr,
408 &sensor_dev_attr_in5_min.dev_attr.attr,
409 &sensor_dev_attr_in5_max.dev_attr.attr,
411 &sensor_dev_attr_temp1_input.dev_attr.attr,
412 &sensor_dev_attr_temp1_min.dev_attr.attr,
413 &sensor_dev_attr_temp1_max.dev_attr.attr,
414 &sensor_dev_attr_temp2_input.dev_attr.attr,
415 &sensor_dev_attr_temp2_min.dev_attr.attr,
416 &sensor_dev_attr_temp2_max.dev_attr.attr,
417 &sensor_dev_attr_temp3_input.dev_attr.attr,
418 &sensor_dev_attr_temp3_min.dev_attr.attr,
419 &sensor_dev_attr_temp3_max.dev_attr.attr,
420 &sensor_dev_attr_temp4_input.dev_attr.attr,
421 &sensor_dev_attr_temp4_min.dev_attr.attr,
422 &sensor_dev_attr_temp4_max.dev_attr.attr,
423 &sensor_dev_attr_temp5_input.dev_attr.attr,
424 &sensor_dev_attr_temp5_min.dev_attr.attr,
425 &sensor_dev_attr_temp5_max.dev_attr.attr,
426 &sensor_dev_attr_temp6_input.dev_attr.attr,
427 &sensor_dev_attr_temp6_min.dev_attr.attr,
428 &sensor_dev_attr_temp6_max.dev_attr.attr,
430 &sensor_dev_attr_fan1_input.dev_attr.attr,
431 &sensor_dev_attr_fan1_min.dev_attr.attr,
432 &sensor_dev_attr_fan2_input.dev_attr.attr,
433 &sensor_dev_attr_fan2_min.dev_attr.attr,
434 &sensor_dev_attr_fan3_input.dev_attr.attr,
435 &sensor_dev_attr_fan3_min.dev_attr.attr,
436 &sensor_dev_attr_fan4_input.dev_attr.attr,
437 &sensor_dev_attr_fan4_min.dev_attr.attr,
438 &sensor_dev_attr_fan5_input.dev_attr.attr,
439 &sensor_dev_attr_fan5_min.dev_attr.attr,
443 ATTRIBUTE_GROUPS(emc6w201);
449 /* Return 0 if detection is successful, -ENODEV otherwise */
450 static int emc6w201_detect(struct i2c_client *client,
451 struct i2c_board_info *info)
453 struct i2c_adapter *adapter = client->adapter;
454 int company, verstep, config;
456 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
460 company = i2c_smbus_read_byte_data(client, EMC6W201_REG_COMPANY);
463 verstep = i2c_smbus_read_byte_data(client, EMC6W201_REG_VERSTEP);
464 if (verstep < 0 || (verstep & 0xF0) != 0xB0)
466 if ((verstep & 0x0F) > 2) {
467 dev_dbg(&client->dev, "Unknwown EMC6W201 stepping %d\n",
472 /* Check configuration */
473 config = i2c_smbus_read_byte_data(client, EMC6W201_REG_CONFIG);
474 if (config < 0 || (config & 0xF4) != 0x04)
476 if (!(config & 0x01)) {
477 dev_err(&client->dev, "Monitoring not enabled\n");
481 strlcpy(info->type, "emc6w201", I2C_NAME_SIZE);
486 static int emc6w201_probe(struct i2c_client *client,
487 const struct i2c_device_id *id)
489 struct device *dev = &client->dev;
490 struct emc6w201_data *data;
491 struct device *hwmon_dev;
493 data = devm_kzalloc(dev, sizeof(struct emc6w201_data), GFP_KERNEL);
497 data->client = client;
498 mutex_init(&data->update_lock);
500 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
503 return PTR_ERR_OR_ZERO(hwmon_dev);
506 static const struct i2c_device_id emc6w201_id[] = {
510 MODULE_DEVICE_TABLE(i2c, emc6w201_id);
512 static struct i2c_driver emc6w201_driver = {
513 .class = I2C_CLASS_HWMON,
517 .probe = emc6w201_probe,
518 .id_table = emc6w201_id,
519 .detect = emc6w201_detect,
520 .address_list = normal_i2c,
523 module_i2c_driver(emc6w201_driver);
525 MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
526 MODULE_DESCRIPTION("SMSC EMC6W201 hardware monitoring driver");
527 MODULE_LICENSE("GPL");