1
2
3
4
5
6
7
8
9#include <linux/module.h>
10#include <linux/init.h>
11#include <linux/slab.h>
12#include <linux/jiffies.h>
13#include <linux/i2c.h>
14#include <linux/hwmon.h>
15#include <linux/hwmon-sysfs.h>
16#include <linux/err.h>
17#include <linux/mutex.h>
18
19
20
21static const unsigned short normal_i2c[] = {
22 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
23
24enum chips {
25 adm1021, adm1023, max1617, max1617a, thmc10, lm84, gl523sm, mc1066 };
26
27
28
29
30
31
32#define ADM1021_REG_TEMP(nr) (nr)
33#define ADM1021_REG_STATUS 0x02
34
35#define ADM1021_REG_MAN_ID 0xFE
36
37#define ADM1021_REG_DEV_ID 0xFF
38
39#define ADM1021_REG_CONFIG_R 0x03
40#define ADM1021_REG_CONFIG_W 0x09
41#define ADM1021_REG_CONV_RATE_R 0x04
42#define ADM1021_REG_CONV_RATE_W 0x0A
43
44#define ADM1023_REG_REM_TEMP_PREC 0x10
45#define ADM1023_REG_REM_OFFSET 0x11
46#define ADM1023_REG_REM_OFFSET_PREC 0x12
47#define ADM1023_REG_REM_TOS_PREC 0x13
48#define ADM1023_REG_REM_THYST_PREC 0x14
49
50
51#define ADM1021_REG_TOS_R(nr) (0x05 + 2 * (nr))
52#define ADM1021_REG_TOS_W(nr) (0x0B + 2 * (nr))
53#define ADM1021_REG_THYST_R(nr) (0x06 + 2 * (nr))
54#define ADM1021_REG_THYST_W(nr) (0x0C + 2 * (nr))
55
56#define ADM1021_REG_ONESHOT 0x0F
57
58
59
60
61
62
63
64
65
66
67
68struct adm1021_data {
69 struct i2c_client *client;
70 enum chips type;
71
72 const struct attribute_group *groups[3];
73
74 struct mutex update_lock;
75 char valid;
76 char low_power;
77 unsigned long last_updated;
78
79 int temp_max[2];
80 int temp_min[2];
81 int temp[2];
82 u8 alarms;
83
84 u8 remote_temp_offset;
85 u8 remote_temp_offset_prec;
86};
87
88
89static bool read_only;
90
91static struct adm1021_data *adm1021_update_device(struct device *dev)
92{
93 struct adm1021_data *data = dev_get_drvdata(dev);
94 struct i2c_client *client = data->client;
95
96 mutex_lock(&data->update_lock);
97
98 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
99 || !data->valid) {
100 int i;
101
102 dev_dbg(dev, "Starting adm1021 update\n");
103
104 for (i = 0; i < 2; i++) {
105 data->temp[i] = 1000 *
106 (s8) i2c_smbus_read_byte_data(
107 client, ADM1021_REG_TEMP(i));
108 data->temp_max[i] = 1000 *
109 (s8) i2c_smbus_read_byte_data(
110 client, ADM1021_REG_TOS_R(i));
111 if (data->type != lm84) {
112 data->temp_min[i] = 1000 *
113 (s8) i2c_smbus_read_byte_data(client,
114 ADM1021_REG_THYST_R(i));
115 }
116 }
117 data->alarms = i2c_smbus_read_byte_data(client,
118 ADM1021_REG_STATUS) & 0x7c;
119 if (data->type == adm1023) {
120
121
122
123
124 data->temp[1] += 125 * (i2c_smbus_read_byte_data(
125 client, ADM1023_REG_REM_TEMP_PREC) >> 5);
126 data->temp_max[1] += 125 * (i2c_smbus_read_byte_data(
127 client, ADM1023_REG_REM_TOS_PREC) >> 5);
128 data->temp_min[1] += 125 * (i2c_smbus_read_byte_data(
129 client, ADM1023_REG_REM_THYST_PREC) >> 5);
130 data->remote_temp_offset =
131 i2c_smbus_read_byte_data(client,
132 ADM1023_REG_REM_OFFSET);
133 data->remote_temp_offset_prec =
134 i2c_smbus_read_byte_data(client,
135 ADM1023_REG_REM_OFFSET_PREC);
136 }
137 data->last_updated = jiffies;
138 data->valid = 1;
139 }
140
141 mutex_unlock(&data->update_lock);
142
143 return data;
144}
145
146static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
147 char *buf)
148{
149 int index = to_sensor_dev_attr(devattr)->index;
150 struct adm1021_data *data = adm1021_update_device(dev);
151
152 return sprintf(buf, "%d\n", data->temp[index]);
153}
154
155static ssize_t temp_max_show(struct device *dev,
156 struct device_attribute *devattr, char *buf)
157{
158 int index = to_sensor_dev_attr(devattr)->index;
159 struct adm1021_data *data = adm1021_update_device(dev);
160
161 return sprintf(buf, "%d\n", data->temp_max[index]);
162}
163
164static ssize_t temp_min_show(struct device *dev,
165 struct device_attribute *devattr, char *buf)
166{
167 int index = to_sensor_dev_attr(devattr)->index;
168 struct adm1021_data *data = adm1021_update_device(dev);
169
170 return sprintf(buf, "%d\n", data->temp_min[index]);
171}
172
173static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
174 char *buf)
175{
176 int index = to_sensor_dev_attr(attr)->index;
177 struct adm1021_data *data = adm1021_update_device(dev);
178 return sprintf(buf, "%u\n", (data->alarms >> index) & 1);
179}
180
181static ssize_t alarms_show(struct device *dev,
182 struct device_attribute *attr,
183 char *buf)
184{
185 struct adm1021_data *data = adm1021_update_device(dev);
186 return sprintf(buf, "%u\n", data->alarms);
187}
188
189static ssize_t temp_max_store(struct device *dev,
190 struct device_attribute *devattr,
191 const char *buf, size_t count)
192{
193 int index = to_sensor_dev_attr(devattr)->index;
194 struct adm1021_data *data = dev_get_drvdata(dev);
195 struct i2c_client *client = data->client;
196 long temp;
197 int reg_val, err;
198
199 err = kstrtol(buf, 10, &temp);
200 if (err)
201 return err;
202 temp /= 1000;
203
204 mutex_lock(&data->update_lock);
205 reg_val = clamp_val(temp, -128, 127);
206 data->temp_max[index] = reg_val * 1000;
207 if (!read_only)
208 i2c_smbus_write_byte_data(client, ADM1021_REG_TOS_W(index),
209 reg_val);
210 mutex_unlock(&data->update_lock);
211
212 return count;
213}
214
215static ssize_t temp_min_store(struct device *dev,
216 struct device_attribute *devattr,
217 const char *buf, size_t count)
218{
219 int index = to_sensor_dev_attr(devattr)->index;
220 struct adm1021_data *data = dev_get_drvdata(dev);
221 struct i2c_client *client = data->client;
222 long temp;
223 int reg_val, err;
224
225 err = kstrtol(buf, 10, &temp);
226 if (err)
227 return err;
228 temp /= 1000;
229
230 mutex_lock(&data->update_lock);
231 reg_val = clamp_val(temp, -128, 127);
232 data->temp_min[index] = reg_val * 1000;
233 if (!read_only)
234 i2c_smbus_write_byte_data(client, ADM1021_REG_THYST_W(index),
235 reg_val);
236 mutex_unlock(&data->update_lock);
237
238 return count;
239}
240
241static ssize_t low_power_show(struct device *dev,
242 struct device_attribute *devattr, char *buf)
243{
244 struct adm1021_data *data = adm1021_update_device(dev);
245 return sprintf(buf, "%d\n", data->low_power);
246}
247
248static ssize_t low_power_store(struct device *dev,
249 struct device_attribute *devattr,
250 const char *buf, size_t count)
251{
252 struct adm1021_data *data = dev_get_drvdata(dev);
253 struct i2c_client *client = data->client;
254 char low_power;
255 unsigned long val;
256 int err;
257
258 err = kstrtoul(buf, 10, &val);
259 if (err)
260 return err;
261 low_power = val != 0;
262
263 mutex_lock(&data->update_lock);
264 if (low_power != data->low_power) {
265 int config = i2c_smbus_read_byte_data(
266 client, ADM1021_REG_CONFIG_R);
267 data->low_power = low_power;
268 i2c_smbus_write_byte_data(client, ADM1021_REG_CONFIG_W,
269 (config & 0xBF) | (low_power << 6));
270 }
271 mutex_unlock(&data->update_lock);
272
273 return count;
274}
275
276
277static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0);
278static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_max, 0);
279static SENSOR_DEVICE_ATTR_RW(temp1_min, temp_min, 0);
280static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1);
281static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_max, 1);
282static SENSOR_DEVICE_ATTR_RW(temp2_min, temp_min, 1);
283static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 6);
284static SENSOR_DEVICE_ATTR_RO(temp1_min_alarm, alarm, 5);
285static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 4);
286static SENSOR_DEVICE_ATTR_RO(temp2_min_alarm, alarm, 3);
287static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 2);
288
289static DEVICE_ATTR_RO(alarms);
290static DEVICE_ATTR_RW(low_power);
291
292static struct attribute *adm1021_attributes[] = {
293 &sensor_dev_attr_temp1_max.dev_attr.attr,
294 &sensor_dev_attr_temp1_input.dev_attr.attr,
295 &sensor_dev_attr_temp2_max.dev_attr.attr,
296 &sensor_dev_attr_temp2_input.dev_attr.attr,
297 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
298 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
299 &sensor_dev_attr_temp2_fault.dev_attr.attr,
300 &dev_attr_alarms.attr,
301 &dev_attr_low_power.attr,
302 NULL
303};
304
305static const struct attribute_group adm1021_group = {
306 .attrs = adm1021_attributes,
307};
308
309static struct attribute *adm1021_min_attributes[] = {
310 &sensor_dev_attr_temp1_min.dev_attr.attr,
311 &sensor_dev_attr_temp2_min.dev_attr.attr,
312 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
313 &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
314 NULL
315};
316
317static const struct attribute_group adm1021_min_group = {
318 .attrs = adm1021_min_attributes,
319};
320
321
322static int adm1021_detect(struct i2c_client *client,
323 struct i2c_board_info *info)
324{
325 struct i2c_adapter *adapter = client->adapter;
326 const char *type_name;
327 int conv_rate, status, config, man_id, dev_id;
328
329 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
330 pr_debug("detect failed, smbus byte data not supported!\n");
331 return -ENODEV;
332 }
333
334 status = i2c_smbus_read_byte_data(client, ADM1021_REG_STATUS);
335 conv_rate = i2c_smbus_read_byte_data(client,
336 ADM1021_REG_CONV_RATE_R);
337 config = i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R);
338
339
340 if ((status & 0x03) || (config & 0x3F) || (conv_rate & 0xF8)) {
341 pr_debug("detect failed, chip not detected!\n");
342 return -ENODEV;
343 }
344
345
346 man_id = i2c_smbus_read_byte_data(client, ADM1021_REG_MAN_ID);
347 dev_id = i2c_smbus_read_byte_data(client, ADM1021_REG_DEV_ID);
348
349 if (man_id < 0 || dev_id < 0)
350 return -ENODEV;
351
352 if (man_id == 0x4d && dev_id == 0x01)
353 type_name = "max1617a";
354 else if (man_id == 0x41) {
355 if ((dev_id & 0xF0) == 0x30)
356 type_name = "adm1023";
357 else if ((dev_id & 0xF0) == 0x00)
358 type_name = "adm1021";
359 else
360 return -ENODEV;
361 } else if (man_id == 0x49)
362 type_name = "thmc10";
363 else if (man_id == 0x23)
364 type_name = "gl523sm";
365 else if (man_id == 0x54)
366 type_name = "mc1066";
367 else {
368 int lte, rte, lhi, rhi, llo, rlo;
369
370
371
372 llo = i2c_smbus_read_byte_data(client, ADM1021_REG_THYST_R(0));
373 rlo = i2c_smbus_read_byte_data(client, ADM1021_REG_THYST_R(1));
374
375
376 if (llo < 0 || rlo < 0)
377 return -ENODEV;
378
379 lte = i2c_smbus_read_byte_data(client, ADM1021_REG_TEMP(0));
380 rte = i2c_smbus_read_byte_data(client, ADM1021_REG_TEMP(1));
381 lhi = i2c_smbus_read_byte_data(client, ADM1021_REG_TOS_R(0));
382 rhi = i2c_smbus_read_byte_data(client, ADM1021_REG_TOS_R(1));
383
384
385
386
387
388 if ((s8)lte < 0 || (s8)rte < 0 || (s8)lhi < 0 || (s8)rhi < 0)
389 return -ENODEV;
390
391
392 if (lte == rte && lte == lhi && lte == rhi && lte == llo
393 && lte == rlo)
394 return -ENODEV;
395
396
397
398
399
400 if (conv_rate == 0x00
401 && (config & 0x7F) == 0x00
402 && (status & 0xAB) == 0x00) {
403 type_name = "lm84";
404 } else {
405
406 if ((s8)llo > lhi || (s8)rlo > rhi)
407 return -ENODEV;
408 type_name = "max1617";
409 }
410 }
411
412 pr_debug("Detected chip %s at adapter %d, address 0x%02x.\n",
413 type_name, i2c_adapter_id(adapter), client->addr);
414 strlcpy(info->type, type_name, I2C_NAME_SIZE);
415
416 return 0;
417}
418
419static void adm1021_init_client(struct i2c_client *client)
420{
421
422 i2c_smbus_write_byte_data(client, ADM1021_REG_CONFIG_W,
423 i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R) & 0xBF);
424
425 i2c_smbus_write_byte_data(client, ADM1021_REG_CONV_RATE_W, 0x04);
426}
427
428static int adm1021_probe(struct i2c_client *client,
429 const struct i2c_device_id *id)
430{
431 struct device *dev = &client->dev;
432 struct adm1021_data *data;
433 struct device *hwmon_dev;
434
435 data = devm_kzalloc(dev, sizeof(struct adm1021_data), GFP_KERNEL);
436 if (!data)
437 return -ENOMEM;
438
439 data->client = client;
440 data->type = id->driver_data;
441 mutex_init(&data->update_lock);
442
443
444 if (data->type != lm84 && !read_only)
445 adm1021_init_client(client);
446
447 data->groups[0] = &adm1021_group;
448 if (data->type != lm84)
449 data->groups[1] = &adm1021_min_group;
450
451 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
452 data, data->groups);
453
454 return PTR_ERR_OR_ZERO(hwmon_dev);
455}
456
457static const struct i2c_device_id adm1021_id[] = {
458 { "adm1021", adm1021 },
459 { "adm1023", adm1023 },
460 { "max1617", max1617 },
461 { "max1617a", max1617a },
462 { "thmc10", thmc10 },
463 { "lm84", lm84 },
464 { "gl523sm", gl523sm },
465 { "mc1066", mc1066 },
466 { }
467};
468MODULE_DEVICE_TABLE(i2c, adm1021_id);
469
470static struct i2c_driver adm1021_driver = {
471 .class = I2C_CLASS_HWMON,
472 .driver = {
473 .name = "adm1021",
474 },
475 .probe = adm1021_probe,
476 .id_table = adm1021_id,
477 .detect = adm1021_detect,
478 .address_list = normal_i2c,
479};
480
481module_i2c_driver(adm1021_driver);
482
483MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
484 "Philip Edelbrock <phil@netroedge.com>");
485MODULE_DESCRIPTION("adm1021 driver");
486MODULE_LICENSE("GPL");
487
488module_param(read_only, bool, 0);
489MODULE_PARM_DESC(read_only, "Don't set any values, read only mode");
490
