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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
31
32
33
34static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
35
36
37
38
39
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)
51
52enum { input, min, max } subfeature;
53
54
55
56
57
58struct emc6w201_data {
59 struct device *hwmon_dev;
60 struct mutex update_lock;
61 char valid;
62 unsigned long last_updated;
63
64
65 u8 in[3][6];
66 s8 temp[3][6];
67 u16 fan[2][5];
68};
69
70
71
72
73
74static u16 emc6w201_read16(struct i2c_client *client, u8 reg)
75{
76 int lsb, msb;
77
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",
82 16, "read", reg);
83 return 0xFFFF;
84 }
85
86 return (msb << 8) | lsb;
87}
88
89
90
91
92
93static int emc6w201_write16(struct i2c_client *client, u8 reg, u16 val)
94{
95 int err;
96
97 err = i2c_smbus_write_byte_data(client, reg, val & 0xff);
98 if (likely(!err))
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",
102 16, "write", reg);
103
104 return err;
105}
106
107
108static u8 emc6w201_read8(struct i2c_client *client, u8 reg)
109{
110 int val;
111
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",
115 8, "read", reg);
116 return 0x00;
117 }
118
119 return val;
120}
121
122
123static int emc6w201_write8(struct i2c_client *client, u8 reg, u8 val)
124{
125 int err;
126
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",
130 8, "write", reg);
131
132 return err;
133}
134
135static struct emc6w201_data *emc6w201_update_device(struct device *dev)
136{
137 struct i2c_client *client = to_i2c_client(dev);
138 struct emc6w201_data *data = i2c_get_clientdata(client);
139 int nr;
140
141 mutex_lock(&data->update_lock);
142
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));
148 data->in[min][nr] =
149 emc6w201_read8(client,
150 EMC6W201_REG_IN_LOW(nr));
151 data->in[max][nr] =
152 emc6w201_read8(client,
153 EMC6W201_REG_IN_HIGH(nr));
154 }
155
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));
166 }
167
168 for (nr = 0; nr < 5; nr++) {
169 data->fan[input][nr] =
170 emc6w201_read16(client,
171 EMC6W201_REG_FAN(nr));
172 data->fan[min][nr] =
173 emc6w201_read16(client,
174 EMC6W201_REG_FAN_MIN(nr));
175 }
176
177 data->last_updated = jiffies;
178 data->valid = 1;
179 }
180
181 mutex_unlock(&data->update_lock);
182
183 return data;
184}
185
186
187
188
189
190static const s16 nominal_mv[6] = { 2500, 1500, 3300, 5000, 1500, 1500 };
191
192static ssize_t show_in(struct device *dev, struct device_attribute *devattr,
193 char *buf)
194{
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;
198
199 return sprintf(buf, "%u\n",
200 (unsigned)data->in[sf][nr] * nominal_mv[nr] / 0xC0);
201}
202
203static ssize_t set_in(struct device *dev, struct device_attribute *devattr,
204 const char *buf, size_t count)
205{
206 struct i2c_client *client = to_i2c_client(dev);
207 struct emc6w201_data *data = i2c_get_clientdata(client);
208 int sf = to_sensor_dev_attr_2(devattr)->index;
209 int nr = to_sensor_dev_attr_2(devattr)->nr;
210 int err;
211 long val;
212 u8 reg;
213
214 err = kstrtol(buf, 10, &val);
215 if (err < 0)
216 return err;
217
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);
221
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);
226
227 return err < 0 ? err : count;
228}
229
230static ssize_t show_temp(struct device *dev, struct device_attribute *devattr,
231 char *buf)
232{
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;
236
237 return sprintf(buf, "%d\n", (int)data->temp[sf][nr] * 1000);
238}
239
240static ssize_t set_temp(struct device *dev, struct device_attribute *devattr,
241 const char *buf, size_t count)
242{
243 struct i2c_client *client = to_i2c_client(dev);
244 struct emc6w201_data *data = i2c_get_clientdata(client);
245 int sf = to_sensor_dev_attr_2(devattr)->index;
246 int nr = to_sensor_dev_attr_2(devattr)->nr;
247 int err;
248 long val;
249 u8 reg;
250
251 err = kstrtol(buf, 10, &val);
252 if (err < 0)
253 return err;
254
255 val /= 1000;
256 reg = (sf == min) ? EMC6W201_REG_TEMP_LOW(nr)
257 : EMC6W201_REG_TEMP_HIGH(nr);
258
259 mutex_lock(&data->update_lock);
260 data->temp[sf][nr] = clamp_val(val, -127, 128);
261 err = emc6w201_write8(client, reg, data->temp[sf][nr]);
262 mutex_unlock(&data->update_lock);
263
264 return err < 0 ? err : count;
265}
266
267static ssize_t show_fan(struct device *dev, struct device_attribute *devattr,
268 char *buf)
269{
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;
273 unsigned rpm;
274
275 if (data->fan[sf][nr] == 0 || data->fan[sf][nr] == 0xFFFF)
276 rpm = 0;
277 else
278 rpm = 5400000U / data->fan[sf][nr];
279
280 return sprintf(buf, "%u\n", rpm);
281}
282
283static ssize_t set_fan(struct device *dev, struct device_attribute *devattr,
284 const char *buf, size_t count)
285{
286 struct i2c_client *client = to_i2c_client(dev);
287 struct emc6w201_data *data = i2c_get_clientdata(client);
288 int sf = to_sensor_dev_attr_2(devattr)->index;
289 int nr = to_sensor_dev_attr_2(devattr)->nr;
290 int err;
291 unsigned long val;
292
293 err = kstrtoul(buf, 10, &val);
294 if (err < 0)
295 return err;
296
297 if (val == 0) {
298 val = 0xFFFF;
299 } else {
300 val = DIV_ROUND_CLOSEST(5400000U, val);
301 val = clamp_val(val, 0, 0xFFFE);
302 }
303
304 mutex_lock(&data->update_lock);
305 data->fan[sf][nr] = val;
306 err = emc6w201_write16(client, EMC6W201_REG_FAN_MIN(nr),
307 data->fan[sf][nr]);
308 mutex_unlock(&data->update_lock);
309
310 return err < 0 ? err : count;
311}
312
313static SENSOR_DEVICE_ATTR_2(in0_input, S_IRUGO, show_in, NULL, 0, input);
314static SENSOR_DEVICE_ATTR_2(in0_min, S_IRUGO | S_IWUSR, show_in, set_in,
315 0, min);
316static SENSOR_DEVICE_ATTR_2(in0_max, S_IRUGO | S_IWUSR, show_in, set_in,
317 0, max);
318static SENSOR_DEVICE_ATTR_2(in1_input, S_IRUGO, show_in, NULL, 1, input);
319static SENSOR_DEVICE_ATTR_2(in1_min, S_IRUGO | S_IWUSR, show_in, set_in,
320 1, min);
321static SENSOR_DEVICE_ATTR_2(in1_max, S_IRUGO | S_IWUSR, show_in, set_in,
322 1, max);
323static SENSOR_DEVICE_ATTR_2(in2_input, S_IRUGO, show_in, NULL, 2, input);
324static SENSOR_DEVICE_ATTR_2(in2_min, S_IRUGO | S_IWUSR, show_in, set_in,
325 2, min);
326static SENSOR_DEVICE_ATTR_2(in2_max, S_IRUGO | S_IWUSR, show_in, set_in,
327 2, max);
328static SENSOR_DEVICE_ATTR_2(in3_input, S_IRUGO, show_in, NULL, 3, input);
329static SENSOR_DEVICE_ATTR_2(in3_min, S_IRUGO | S_IWUSR, show_in, set_in,
330 3, min);
331static SENSOR_DEVICE_ATTR_2(in3_max, S_IRUGO | S_IWUSR, show_in, set_in,
332 3, max);
333static SENSOR_DEVICE_ATTR_2(in4_input, S_IRUGO, show_in, NULL, 4, input);
334static SENSOR_DEVICE_ATTR_2(in4_min, S_IRUGO | S_IWUSR, show_in, set_in,
335 4, min);
336static SENSOR_DEVICE_ATTR_2(in4_max, S_IRUGO | S_IWUSR, show_in, set_in,
337 4, max);
338static SENSOR_DEVICE_ATTR_2(in5_input, S_IRUGO, show_in, NULL, 5, input);
339static SENSOR_DEVICE_ATTR_2(in5_min, S_IRUGO | S_IWUSR, show_in, set_in,
340 5, min);
341static SENSOR_DEVICE_ATTR_2(in5_max, S_IRUGO | S_IWUSR, show_in, set_in,
342 5, max);
343
344static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, input);
345static SENSOR_DEVICE_ATTR_2(temp1_min, S_IRUGO | S_IWUSR, show_temp, set_temp,
346 0, min);
347static SENSOR_DEVICE_ATTR_2(temp1_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
348 0, max);
349static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 1, input);
350static SENSOR_DEVICE_ATTR_2(temp2_min, S_IRUGO | S_IWUSR, show_temp, set_temp,
351 1, min);
352static SENSOR_DEVICE_ATTR_2(temp2_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
353 1, max);
354static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 2, input);
355static SENSOR_DEVICE_ATTR_2(temp3_min, S_IRUGO | S_IWUSR, show_temp, set_temp,
356 2, min);
357static SENSOR_DEVICE_ATTR_2(temp3_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
358 2, max);
359static SENSOR_DEVICE_ATTR_2(temp4_input, S_IRUGO, show_temp, NULL, 3, input);
360static SENSOR_DEVICE_ATTR_2(temp4_min, S_IRUGO | S_IWUSR, show_temp, set_temp,
361 3, min);
362static SENSOR_DEVICE_ATTR_2(temp4_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
363 3, max);
364static SENSOR_DEVICE_ATTR_2(temp5_input, S_IRUGO, show_temp, NULL, 4, input);
365static SENSOR_DEVICE_ATTR_2(temp5_min, S_IRUGO | S_IWUSR, show_temp, set_temp,
366 4, min);
367static SENSOR_DEVICE_ATTR_2(temp5_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
368 4, max);
369static SENSOR_DEVICE_ATTR_2(temp6_input, S_IRUGO, show_temp, NULL, 5, input);
370static SENSOR_DEVICE_ATTR_2(temp6_min, S_IRUGO | S_IWUSR, show_temp, set_temp,
371 5, min);
372static SENSOR_DEVICE_ATTR_2(temp6_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
373 5, max);
374
375static SENSOR_DEVICE_ATTR_2(fan1_input, S_IRUGO, show_fan, NULL, 0, input);
376static SENSOR_DEVICE_ATTR_2(fan1_min, S_IRUGO | S_IWUSR, show_fan, set_fan,
377 0, min);
378static SENSOR_DEVICE_ATTR_2(fan2_input, S_IRUGO, show_fan, NULL, 1, input);
379static SENSOR_DEVICE_ATTR_2(fan2_min, S_IRUGO | S_IWUSR, show_fan, set_fan,
380 1, min);
381static SENSOR_DEVICE_ATTR_2(fan3_input, S_IRUGO, show_fan, NULL, 2, input);
382static SENSOR_DEVICE_ATTR_2(fan3_min, S_IRUGO | S_IWUSR, show_fan, set_fan,
383 2, min);
384static SENSOR_DEVICE_ATTR_2(fan4_input, S_IRUGO, show_fan, NULL, 3, input);
385static SENSOR_DEVICE_ATTR_2(fan4_min, S_IRUGO | S_IWUSR, show_fan, set_fan,
386 3, min);
387static SENSOR_DEVICE_ATTR_2(fan5_input, S_IRUGO, show_fan, NULL, 4, input);
388static SENSOR_DEVICE_ATTR_2(fan5_min, S_IRUGO | S_IWUSR, show_fan, set_fan,
389 4, min);
390
391static struct attribute *emc6w201_attributes[] = {
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,
410
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,
429
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,
440 NULL
441};
442
443static const struct attribute_group emc6w201_group = {
444 .attrs = emc6w201_attributes,
445};
446
447
448
449
450
451
452static int emc6w201_detect(struct i2c_client *client,
453 struct i2c_board_info *info)
454{
455 struct i2c_adapter *adapter = client->adapter;
456 int company, verstep, config;
457
458 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
459 return -ENODEV;
460
461
462 company = i2c_smbus_read_byte_data(client, EMC6W201_REG_COMPANY);
463 if (company != 0x5C)
464 return -ENODEV;
465 verstep = i2c_smbus_read_byte_data(client, EMC6W201_REG_VERSTEP);
466 if (verstep < 0 || (verstep & 0xF0) != 0xB0)
467 return -ENODEV;
468 if ((verstep & 0x0F) > 2) {
469 dev_dbg(&client->dev, "Unknwown EMC6W201 stepping %d\n",
470 verstep & 0x0F);
471 return -ENODEV;
472 }
473
474
475 config = i2c_smbus_read_byte_data(client, EMC6W201_REG_CONFIG);
476 if (config < 0 || (config & 0xF4) != 0x04)
477 return -ENODEV;
478 if (!(config & 0x01)) {
479 dev_err(&client->dev, "Monitoring not enabled\n");
480 return -ENODEV;
481 }
482
483 strlcpy(info->type, "emc6w201", I2C_NAME_SIZE);
484
485 return 0;
486}
487
488static int emc6w201_probe(struct i2c_client *client,
489 const struct i2c_device_id *id)
490{
491 struct emc6w201_data *data;
492 int err;
493
494 data = devm_kzalloc(&client->dev, sizeof(struct emc6w201_data),
495 GFP_KERNEL);
496 if (!data)
497 return -ENOMEM;
498
499 i2c_set_clientdata(client, data);
500 mutex_init(&data->update_lock);
501
502
503 err = sysfs_create_group(&client->dev.kobj, &emc6w201_group);
504 if (err)
505 return err;
506
507
508 data->hwmon_dev = hwmon_device_register(&client->dev);
509 if (IS_ERR(data->hwmon_dev)) {
510 err = PTR_ERR(data->hwmon_dev);
511 goto exit_remove;
512 }
513
514 return 0;
515
516 exit_remove:
517 sysfs_remove_group(&client->dev.kobj, &emc6w201_group);
518 return err;
519}
520
521static int emc6w201_remove(struct i2c_client *client)
522{
523 struct emc6w201_data *data = i2c_get_clientdata(client);
524
525 hwmon_device_unregister(data->hwmon_dev);
526 sysfs_remove_group(&client->dev.kobj, &emc6w201_group);
527
528 return 0;
529}
530
531static const struct i2c_device_id emc6w201_id[] = {
532 { "emc6w201", 0 },
533 { }
534};
535MODULE_DEVICE_TABLE(i2c, emc6w201_id);
536
537static struct i2c_driver emc6w201_driver = {
538 .class = I2C_CLASS_HWMON,
539 .driver = {
540 .name = "emc6w201",
541 },
542 .probe = emc6w201_probe,
543 .remove = emc6w201_remove,
544 .id_table = emc6w201_id,
545 .detect = emc6w201_detect,
546 .address_list = normal_i2c,
547};
548
549module_i2c_driver(emc6w201_driver);
550
551MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
552MODULE_DESCRIPTION("SMSC EMC6W201 hardware monitoring driver");
553MODULE_LICENSE("GPL");
554
