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1/*
2 * Copyright (C) 2011 Alexander Stein <alexander.stein@systec-electronic.com>
3 *
4 * The LM95245 is a sensor chip made by National Semiconductors.
5 * It reports up to two temperatures (its own plus an external one).
6 * Complete datasheet can be obtained from National's website at:
7 * http://www.national.com/ds.cgi/LM/LM95245.pdf
8 *
9 * This driver is based on lm95241.c
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 */
25
26#include <linux/module.h>
27#include <linux/init.h>
28#include <linux/slab.h>
29#include <linux/jiffies.h>
30#include <linux/i2c.h>
31#include <linux/hwmon.h>
32#include <linux/hwmon-sysfs.h>
33#include <linux/err.h>
34#include <linux/mutex.h>
35#include <linux/sysfs.h>
36
37#define DEVNAME "lm95245"
38
39static const unsigned short normal_i2c[] = {
40 0x18, 0x19, 0x29, 0x4c, 0x4d, I2C_CLIENT_END };
41
42/* LM95245 registers */
43/* general registers */
44#define LM95245_REG_RW_CONFIG1 0x03
45#define LM95245_REG_RW_CONVERS_RATE 0x04
46#define LM95245_REG_W_ONE_SHOT 0x0F
47
48/* diode configuration */
49#define LM95245_REG_RW_CONFIG2 0xBF
50#define LM95245_REG_RW_REMOTE_OFFH 0x11
51#define LM95245_REG_RW_REMOTE_OFFL 0x12
52
53/* status registers */
54#define LM95245_REG_R_STATUS1 0x02
55#define LM95245_REG_R_STATUS2 0x33
56
57/* limit registers */
58#define LM95245_REG_RW_REMOTE_OS_LIMIT 0x07
59#define LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT 0x20
60#define LM95245_REG_RW_REMOTE_TCRIT_LIMIT 0x19
61#define LM95245_REG_RW_COMMON_HYSTERESIS 0x21
62
63/* temperature signed */
64#define LM95245_REG_R_LOCAL_TEMPH_S 0x00
65#define LM95245_REG_R_LOCAL_TEMPL_S 0x30
66#define LM95245_REG_R_REMOTE_TEMPH_S 0x01
67#define LM95245_REG_R_REMOTE_TEMPL_S 0x10
68/* temperature unsigned */
69#define LM95245_REG_R_REMOTE_TEMPH_U 0x31
70#define LM95245_REG_R_REMOTE_TEMPL_U 0x32
71
72/* id registers */
73#define LM95245_REG_R_MAN_ID 0xFE
74#define LM95245_REG_R_CHIP_ID 0xFF
75
76/* LM95245 specific bitfields */
77#define CFG_STOP 0x40
78#define CFG_REMOTE_TCRIT_MASK 0x10
79#define CFG_REMOTE_OS_MASK 0x08
80#define CFG_LOCAL_TCRIT_MASK 0x04
81#define CFG_LOCAL_OS_MASK 0x02
82
83#define CFG2_OS_A0 0x40
84#define CFG2_DIODE_FAULT_OS 0x20
85#define CFG2_DIODE_FAULT_TCRIT 0x10
86#define CFG2_REMOTE_TT 0x08
87#define CFG2_REMOTE_FILTER_DIS 0x00
88#define CFG2_REMOTE_FILTER_EN 0x06
89
90/* conversation rate in ms */
91#define RATE_CR0063 0x00
92#define RATE_CR0364 0x01
93#define RATE_CR1000 0x02
94#define RATE_CR2500 0x03
95
96#define STATUS1_DIODE_FAULT 0x04
97#define STATUS1_RTCRIT 0x02
98#define STATUS1_LOC 0x01
99
100#define MANUFACTURER_ID 0x01
101#define DEFAULT_REVISION 0xB3
102
103static const u8 lm95245_reg_address[] = {
104 LM95245_REG_R_LOCAL_TEMPH_S,
105 LM95245_REG_R_LOCAL_TEMPL_S,
106 LM95245_REG_R_REMOTE_TEMPH_S,
107 LM95245_REG_R_REMOTE_TEMPL_S,
108 LM95245_REG_R_REMOTE_TEMPH_U,
109 LM95245_REG_R_REMOTE_TEMPL_U,
110 LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT,
111 LM95245_REG_RW_REMOTE_TCRIT_LIMIT,
112 LM95245_REG_RW_COMMON_HYSTERESIS,
113 LM95245_REG_R_STATUS1,
114};
115
116/* Client data (each client gets its own) */
117struct lm95245_data {
118 struct device *hwmon_dev;
119 struct mutex update_lock;
120 unsigned long last_updated; /* in jiffies */
121 unsigned long interval; /* in msecs */
122 bool valid; /* zero until following fields are valid */
123 /* registers values */
124 u8 regs[ARRAY_SIZE(lm95245_reg_address)];
125 u8 config1, config2;
126};
127
128/* Conversions */
129static int temp_from_reg_unsigned(u8 val_h, u8 val_l)
130{
131 return val_h * 1000 + val_l * 1000 / 256;
132}
133
134static int temp_from_reg_signed(u8 val_h, u8 val_l)
135{
136 if (val_h & 0x80)
137 return (val_h - 0x100) * 1000;
138 return temp_from_reg_unsigned(val_h, val_l);
139}
140
141static struct lm95245_data *lm95245_update_device(struct device *dev)
142{
143 struct i2c_client *client = to_i2c_client(dev);
144 struct lm95245_data *data = i2c_get_clientdata(client);
145
146 mutex_lock(&data->update_lock);
147
148 if (time_after(jiffies, data->last_updated
149 + msecs_to_jiffies(data->interval)) || !data->valid) {
150 int i;
151
152 dev_dbg(&client->dev, "Updating lm95245 data.\n");
153 for (i = 0; i < ARRAY_SIZE(lm95245_reg_address); i++)
154 data->regs[i]
155 = i2c_smbus_read_byte_data(client,
156 lm95245_reg_address[i]);
157 data->last_updated = jiffies;
158 data->valid = 1;
159 }
160
161 mutex_unlock(&data->update_lock);
162
163 return data;
164}
165
166static unsigned long lm95245_read_conversion_rate(struct i2c_client *client)
167{
168 int rate;
169 unsigned long interval;
170
171 rate = i2c_smbus_read_byte_data(client, LM95245_REG_RW_CONVERS_RATE);
172
173 switch (rate) {
174 case RATE_CR0063:
175 interval = 63;
176 break;
177 case RATE_CR0364:
178 interval = 364;
179 break;
180 case RATE_CR1000:
181 interval = 1000;
182 break;
183 case RATE_CR2500:
184 default:
185 interval = 2500;
186 break;
187 }
188
189 return interval;
190}
191
192static unsigned long lm95245_set_conversion_rate(struct i2c_client *client,
193 unsigned long interval)
194{
195 int rate;
196
197 if (interval <= 63) {
198 interval = 63;
199 rate = RATE_CR0063;
200 } else if (interval <= 364) {
201 interval = 364;
202 rate = RATE_CR0364;
203 } else if (interval <= 1000) {
204 interval = 1000;
205 rate = RATE_CR1000;
206 } else {
207 interval = 2500;
208 rate = RATE_CR2500;
209 }
210
211 i2c_smbus_write_byte_data(client, LM95245_REG_RW_CONVERS_RATE, rate);
212
213 return interval;
214}
215
216/* Sysfs stuff */
217static ssize_t show_input(struct device *dev, struct device_attribute *attr,
218 char *buf)
219{
220 struct lm95245_data *data = lm95245_update_device(dev);
221 int temp;
222 int index = to_sensor_dev_attr(attr)->index;
223
224 /*
225 * Index 0 (Local temp) is always signed
226 * Index 2 (Remote temp) has both signed and unsigned data
227 * use signed calculation for remote if signed bit is set
228 */
229 if (index == 0 || data->regs[index] & 0x80)
230 temp = temp_from_reg_signed(data->regs[index],
231 data->regs[index + 1]);
232 else
233 temp = temp_from_reg_unsigned(data->regs[index + 2],
234 data->regs[index + 3]);
235
236 return snprintf(buf, PAGE_SIZE - 1, "%d\n", temp);
237}
238
239static ssize_t show_limit(struct device *dev, struct device_attribute *attr,
240 char *buf)
241{
242 struct lm95245_data *data = lm95245_update_device(dev);
243 int index = to_sensor_dev_attr(attr)->index;
244
245 return snprintf(buf, PAGE_SIZE - 1, "%d\n",
246 data->regs[index] * 1000);
247}
248
249static ssize_t set_limit(struct device *dev, struct device_attribute *attr,
250 const char *buf, size_t count)
251{
252 struct i2c_client *client = to_i2c_client(dev);
253 struct lm95245_data *data = i2c_get_clientdata(client);
254 int index = to_sensor_dev_attr(attr)->index;
255 unsigned long val;
256
257 if (strict_strtoul(buf, 10, &val) < 0)
258 return -EINVAL;
259
260 val /= 1000;
261
262 val = SENSORS_LIMIT(val, 0, (index == 6 ? 127 : 255));
263
264 mutex_lock(&data->update_lock);
265
266 data->valid = 0;
267
268 i2c_smbus_write_byte_data(client, lm95245_reg_address[index], val);
269
270 mutex_unlock(&data->update_lock);
271
272 return count;
273}
274
275static ssize_t set_crit_hyst(struct device *dev, struct device_attribute *attr,
276 const char *buf, size_t count)
277{
278 struct i2c_client *client = to_i2c_client(dev);
279 struct lm95245_data *data = i2c_get_clientdata(client);
280 unsigned long val;
281
282 if (strict_strtoul(buf, 10, &val) < 0)
283 return -EINVAL;
284
285 val /= 1000;
286
287 val = SENSORS_LIMIT(val, 0, 31);
288
289 mutex_lock(&data->update_lock);
290
291 data->valid = 0;
292
293 /* shared crit hysteresis */
294 i2c_smbus_write_byte_data(client, LM95245_REG_RW_COMMON_HYSTERESIS,
295 val);
296
297 mutex_unlock(&data->update_lock);
298
299 return count;
300}
301
302static ssize_t show_type(struct device *dev, struct device_attribute *attr,
303 char *buf)
304{
305 struct i2c_client *client = to_i2c_client(dev);
306 struct lm95245_data *data = i2c_get_clientdata(client);
307
308 return snprintf(buf, PAGE_SIZE - 1,
309 data->config2 & CFG2_REMOTE_TT ? "1\n" : "2\n");
310}
311
312static ssize_t set_type(struct device *dev, struct device_attribute *attr,
313 const char *buf, size_t count)
314{
315 struct i2c_client *client = to_i2c_client(dev);
316 struct lm95245_data *data = i2c_get_clientdata(client);
317 unsigned long val;
318
319 if (strict_strtoul(buf, 10, &val) < 0)
320 return -EINVAL;
321 if (val != 1 && val != 2)
322 return -EINVAL;
323
324 mutex_lock(&data->update_lock);
325
326 if (val == 1)
327 data->config2 |= CFG2_REMOTE_TT;
328 else
329 data->config2 &= ~CFG2_REMOTE_TT;
330
331 data->valid = 0;
332
333 i2c_smbus_write_byte_data(client, LM95245_REG_RW_CONFIG2,
334 data->config2);
335
336 mutex_unlock(&data->update_lock);
337
338 return count;
339}
340
341static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
342 char *buf)
343{
344 struct lm95245_data *data = lm95245_update_device(dev);
345 int index = to_sensor_dev_attr(attr)->index;
346
347 return snprintf(buf, PAGE_SIZE - 1, "%d\n",
348 !!(data->regs[9] & index));
349}
350
351static ssize_t show_interval(struct device *dev, struct device_attribute *attr,
352 char *buf)
353{
354 struct lm95245_data *data = lm95245_update_device(dev);
355
356 return snprintf(buf, PAGE_SIZE - 1, "%lu\n", data->interval);
357}
358
359static ssize_t set_interval(struct device *dev, struct device_attribute *attr,
360 const char *buf, size_t count)
361{
362 struct i2c_client *client = to_i2c_client(dev);
363 struct lm95245_data *data = i2c_get_clientdata(client);
364 unsigned long val;
365
366 if (strict_strtoul(buf, 10, &val) < 0)
367 return -EINVAL;
368
369 mutex_lock(&data->update_lock);
370
371 data->interval = lm95245_set_conversion_rate(client, val);
372
373 mutex_unlock(&data->update_lock);
374
375 return count;
376}
377
378static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_input, NULL, 0);
379static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_limit,
380 set_limit, 6);
381static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_limit,
382 set_crit_hyst, 8);
383static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL,
384 STATUS1_LOC);
385
386static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_input, NULL, 2);
387static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_limit,
388 set_limit, 7);
389static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IWUSR | S_IRUGO, show_limit,
390 set_crit_hyst, 8);
391static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL,
392 STATUS1_RTCRIT);
393static SENSOR_DEVICE_ATTR(temp2_type, S_IWUSR | S_IRUGO, show_type,
394 set_type, 0);
395static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL,
396 STATUS1_DIODE_FAULT);
397
398static DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO, show_interval,
399 set_interval);
400
401static struct attribute *lm95245_attributes[] = {
402 &sensor_dev_attr_temp1_input.dev_attr.attr,
403 &sensor_dev_attr_temp1_crit.dev_attr.attr,
404 &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
405 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
406 &sensor_dev_attr_temp2_input.dev_attr.attr,
407 &sensor_dev_attr_temp2_crit.dev_attr.attr,
408 &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
409 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
410 &sensor_dev_attr_temp2_type.dev_attr.attr,
411 &sensor_dev_attr_temp2_fault.dev_attr.attr,
412 &dev_attr_update_interval.attr,
413 NULL
414};
415
416static const struct attribute_group lm95245_group = {
417 .attrs = lm95245_attributes,
418};
419
420/* Return 0 if detection is successful, -ENODEV otherwise */
421static int lm95245_detect(struct i2c_client *new_client,
422 struct i2c_board_info *info)
423{
424 struct i2c_adapter *adapter = new_client->adapter;
425
426 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
427 return -ENODEV;
428
429 if (i2c_smbus_read_byte_data(new_client, LM95245_REG_R_MAN_ID)
430 != MANUFACTURER_ID
431 || i2c_smbus_read_byte_data(new_client, LM95245_REG_R_CHIP_ID)
432 != DEFAULT_REVISION)
433 return -ENODEV;
434
435 strlcpy(info->type, DEVNAME, I2C_NAME_SIZE);
436 return 0;
437}
438
439static void lm95245_init_client(struct i2c_client *client)
440{
441 struct lm95245_data *data = i2c_get_clientdata(client);
442
443 data->valid = 0;
444 data->interval = lm95245_read_conversion_rate(client);
445
446 data->config1 = i2c_smbus_read_byte_data(client,
447 LM95245_REG_RW_CONFIG1);
448 data->config2 = i2c_smbus_read_byte_data(client,
449 LM95245_REG_RW_CONFIG2);
450
451 if (data->config1 & CFG_STOP) {
452 /* Clear the standby bit */
453 data->config1 &= ~CFG_STOP;
454 i2c_smbus_write_byte_data(client, LM95245_REG_RW_CONFIG1,
455 data->config1);
456 }
457}
458
459static int lm95245_probe(struct i2c_client *new_client,
460 const struct i2c_device_id *id)
461{
462 struct lm95245_data *data;
463 int err;
464
465 data = kzalloc(sizeof(struct lm95245_data), GFP_KERNEL);
466 if (!data) {
467 err = -ENOMEM;
468 goto exit;
469 }
470
471 i2c_set_clientdata(new_client, data);
472 mutex_init(&data->update_lock);
473
474 /* Initialize the LM95245 chip */
475 lm95245_init_client(new_client);
476
477 /* Register sysfs hooks */
478 err = sysfs_create_group(&new_client->dev.kobj, &lm95245_group);
479 if (err)
480 goto exit_free;
481
482 data->hwmon_dev = hwmon_device_register(&new_client->dev);
483 if (IS_ERR(data->hwmon_dev)) {
484 err = PTR_ERR(data->hwmon_dev);
485 goto exit_remove_files;
486 }
487
488 return 0;
489
490exit_remove_files:
491 sysfs_remove_group(&new_client->dev.kobj, &lm95245_group);
492exit_free:
493 kfree(data);
494exit:
495 return err;
496}
497
498static int lm95245_remove(struct i2c_client *client)
499{
500 struct lm95245_data *data = i2c_get_clientdata(client);
501
502 hwmon_device_unregister(data->hwmon_dev);
503 sysfs_remove_group(&client->dev.kobj, &lm95245_group);
504
505 kfree(data);
506 return 0;
507}
508
509/* Driver data (common to all clients) */
510static const struct i2c_device_id lm95245_id[] = {
511 { DEVNAME, 0 },
512 { }
513};
514MODULE_DEVICE_TABLE(i2c, lm95245_id);
515
516static struct i2c_driver lm95245_driver = {
517 .class = I2C_CLASS_HWMON,
518 .driver = {
519 .name = DEVNAME,
520 },
521 .probe = lm95245_probe,
522 .remove = lm95245_remove,
523 .id_table = lm95245_id,
524 .detect = lm95245_detect,
525 .address_list = normal_i2c,
526};
527
528static int __init sensors_lm95245_init(void)
529{
530 return i2c_add_driver(&lm95245_driver);
531}
532
533static void __exit sensors_lm95245_exit(void)
534{
535 i2c_del_driver(&lm95245_driver);
536}
537
538MODULE_AUTHOR("Alexander Stein <alexander.stein@systec-electronic.com>");
539MODULE_DESCRIPTION("LM95245 sensor driver");
540MODULE_LICENSE("GPL");
541
542module_init(sensors_lm95245_init);
543module_exit(sensors_lm95245_exit);
1/*
2 * Copyright (C) 2011 Alexander Stein <alexander.stein@systec-electronic.com>
3 *
4 * The LM95245 is a sensor chip made by TI / National Semiconductor.
5 * It reports up to two temperatures (its own plus an external one).
6 *
7 * This driver is based on lm95241.c
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 */
19
20#include <linux/err.h>
21#include <linux/init.h>
22#include <linux/hwmon.h>
23#include <linux/i2c.h>
24#include <linux/module.h>
25#include <linux/mutex.h>
26#include <linux/regmap.h>
27#include <linux/slab.h>
28
29static const unsigned short normal_i2c[] = {
30 0x18, 0x19, 0x29, 0x4c, 0x4d, I2C_CLIENT_END };
31
32/* LM95245 registers */
33/* general registers */
34#define LM95245_REG_RW_CONFIG1 0x03
35#define LM95245_REG_RW_CONVERS_RATE 0x04
36#define LM95245_REG_W_ONE_SHOT 0x0F
37
38/* diode configuration */
39#define LM95245_REG_RW_CONFIG2 0xBF
40#define LM95245_REG_RW_REMOTE_OFFH 0x11
41#define LM95245_REG_RW_REMOTE_OFFL 0x12
42
43/* status registers */
44#define LM95245_REG_R_STATUS1 0x02
45#define LM95245_REG_R_STATUS2 0x33
46
47/* limit registers */
48#define LM95245_REG_RW_REMOTE_OS_LIMIT 0x07
49#define LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT 0x20
50#define LM95245_REG_RW_REMOTE_TCRIT_LIMIT 0x19
51#define LM95245_REG_RW_COMMON_HYSTERESIS 0x21
52
53/* temperature signed */
54#define LM95245_REG_R_LOCAL_TEMPH_S 0x00
55#define LM95245_REG_R_LOCAL_TEMPL_S 0x30
56#define LM95245_REG_R_REMOTE_TEMPH_S 0x01
57#define LM95245_REG_R_REMOTE_TEMPL_S 0x10
58/* temperature unsigned */
59#define LM95245_REG_R_REMOTE_TEMPH_U 0x31
60#define LM95245_REG_R_REMOTE_TEMPL_U 0x32
61
62/* id registers */
63#define LM95245_REG_R_MAN_ID 0xFE
64#define LM95245_REG_R_CHIP_ID 0xFF
65
66/* LM95245 specific bitfields */
67#define CFG_STOP 0x40
68#define CFG_REMOTE_TCRIT_MASK 0x10
69#define CFG_REMOTE_OS_MASK 0x08
70#define CFG_LOCAL_TCRIT_MASK 0x04
71#define CFG_LOCAL_OS_MASK 0x02
72
73#define CFG2_OS_A0 0x40
74#define CFG2_DIODE_FAULT_OS 0x20
75#define CFG2_DIODE_FAULT_TCRIT 0x10
76#define CFG2_REMOTE_TT 0x08
77#define CFG2_REMOTE_FILTER_DIS 0x00
78#define CFG2_REMOTE_FILTER_EN 0x06
79
80/* conversation rate in ms */
81#define RATE_CR0063 0x00
82#define RATE_CR0364 0x01
83#define RATE_CR1000 0x02
84#define RATE_CR2500 0x03
85
86#define STATUS1_ROS 0x10
87#define STATUS1_DIODE_FAULT 0x04
88#define STATUS1_RTCRIT 0x02
89#define STATUS1_LOC 0x01
90
91#define MANUFACTURER_ID 0x01
92#define LM95235_REVISION 0xB1
93#define LM95245_REVISION 0xB3
94
95static const u8 lm95245_reg_address[] = {
96 LM95245_REG_R_LOCAL_TEMPH_S,
97 LM95245_REG_R_LOCAL_TEMPL_S,
98 LM95245_REG_R_REMOTE_TEMPH_S,
99 LM95245_REG_R_REMOTE_TEMPL_S,
100 LM95245_REG_R_REMOTE_TEMPH_U,
101 LM95245_REG_R_REMOTE_TEMPL_U,
102 LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT,
103 LM95245_REG_RW_REMOTE_TCRIT_LIMIT,
104 LM95245_REG_RW_COMMON_HYSTERESIS,
105 LM95245_REG_R_STATUS1,
106};
107
108/* Client data (each client gets its own) */
109struct lm95245_data {
110 struct regmap *regmap;
111 struct mutex update_lock;
112 int interval; /* in msecs */
113};
114
115/* Conversions */
116static int temp_from_reg_unsigned(u8 val_h, u8 val_l)
117{
118 return val_h * 1000 + val_l * 1000 / 256;
119}
120
121static int temp_from_reg_signed(u8 val_h, u8 val_l)
122{
123 if (val_h & 0x80)
124 return (val_h - 0x100) * 1000;
125 return temp_from_reg_unsigned(val_h, val_l);
126}
127
128static int lm95245_read_conversion_rate(struct lm95245_data *data)
129{
130 unsigned int rate;
131 int ret;
132
133 ret = regmap_read(data->regmap, LM95245_REG_RW_CONVERS_RATE, &rate);
134 if (ret < 0)
135 return ret;
136
137 switch (rate) {
138 case RATE_CR0063:
139 data->interval = 63;
140 break;
141 case RATE_CR0364:
142 data->interval = 364;
143 break;
144 case RATE_CR1000:
145 data->interval = 1000;
146 break;
147 case RATE_CR2500:
148 default:
149 data->interval = 2500;
150 break;
151 }
152 return 0;
153}
154
155static int lm95245_set_conversion_rate(struct lm95245_data *data, long interval)
156{
157 int ret, rate;
158
159 if (interval <= 63) {
160 interval = 63;
161 rate = RATE_CR0063;
162 } else if (interval <= 364) {
163 interval = 364;
164 rate = RATE_CR0364;
165 } else if (interval <= 1000) {
166 interval = 1000;
167 rate = RATE_CR1000;
168 } else {
169 interval = 2500;
170 rate = RATE_CR2500;
171 }
172
173 ret = regmap_write(data->regmap, LM95245_REG_RW_CONVERS_RATE, rate);
174 if (ret < 0)
175 return ret;
176
177 data->interval = interval;
178 return 0;
179}
180
181static int lm95245_read_temp(struct device *dev, u32 attr, int channel,
182 long *val)
183{
184 struct lm95245_data *data = dev_get_drvdata(dev);
185 struct regmap *regmap = data->regmap;
186 int ret, regl, regh, regvall, regvalh;
187
188 switch (attr) {
189 case hwmon_temp_input:
190 regl = channel ? LM95245_REG_R_REMOTE_TEMPL_S :
191 LM95245_REG_R_LOCAL_TEMPL_S;
192 regh = channel ? LM95245_REG_R_REMOTE_TEMPH_S :
193 LM95245_REG_R_LOCAL_TEMPH_S;
194 ret = regmap_read(regmap, regl, ®vall);
195 if (ret < 0)
196 return ret;
197 ret = regmap_read(regmap, regh, ®valh);
198 if (ret < 0)
199 return ret;
200 /*
201 * Local temp is always signed.
202 * Remote temp has both signed and unsigned data.
203 * Use signed calculation for remote if signed bit is set
204 * or if reported temperature is below signed limit.
205 */
206 if (!channel || (regvalh & 0x80) || regvalh < 0x7f) {
207 *val = temp_from_reg_signed(regvalh, regvall);
208 return 0;
209 }
210 ret = regmap_read(regmap, LM95245_REG_R_REMOTE_TEMPL_U,
211 ®vall);
212 if (ret < 0)
213 return ret;
214 ret = regmap_read(regmap, LM95245_REG_R_REMOTE_TEMPH_U,
215 ®valh);
216 if (ret < 0)
217 return ret;
218 *val = temp_from_reg_unsigned(regvalh, regvall);
219 return 0;
220 case hwmon_temp_max:
221 ret = regmap_read(regmap, LM95245_REG_RW_REMOTE_OS_LIMIT,
222 ®valh);
223 if (ret < 0)
224 return ret;
225 *val = regvalh * 1000;
226 return 0;
227 case hwmon_temp_crit:
228 regh = channel ? LM95245_REG_RW_REMOTE_TCRIT_LIMIT :
229 LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT;
230 ret = regmap_read(regmap, regh, ®valh);
231 if (ret < 0)
232 return ret;
233 *val = regvalh * 1000;
234 return 0;
235 case hwmon_temp_max_hyst:
236 ret = regmap_read(regmap, LM95245_REG_RW_REMOTE_OS_LIMIT,
237 ®valh);
238 if (ret < 0)
239 return ret;
240 ret = regmap_read(regmap, LM95245_REG_RW_COMMON_HYSTERESIS,
241 ®vall);
242 if (ret < 0)
243 return ret;
244 *val = (regvalh - regvall) * 1000;
245 return 0;
246 case hwmon_temp_crit_hyst:
247 regh = channel ? LM95245_REG_RW_REMOTE_TCRIT_LIMIT :
248 LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT;
249 ret = regmap_read(regmap, regh, ®valh);
250 if (ret < 0)
251 return ret;
252 ret = regmap_read(regmap, LM95245_REG_RW_COMMON_HYSTERESIS,
253 ®vall);
254 if (ret < 0)
255 return ret;
256 *val = (regvalh - regvall) * 1000;
257 return 0;
258 case hwmon_temp_type:
259 ret = regmap_read(regmap, LM95245_REG_RW_CONFIG2, ®valh);
260 if (ret < 0)
261 return ret;
262 *val = (regvalh & CFG2_REMOTE_TT) ? 1 : 2;
263 return 0;
264 case hwmon_temp_offset:
265 ret = regmap_read(regmap, LM95245_REG_RW_REMOTE_OFFL,
266 ®vall);
267 if (ret < 0)
268 return ret;
269 ret = regmap_read(regmap, LM95245_REG_RW_REMOTE_OFFH,
270 ®valh);
271 if (ret < 0)
272 return ret;
273 *val = temp_from_reg_signed(regvalh, regvall);
274 return 0;
275 case hwmon_temp_max_alarm:
276 ret = regmap_read(regmap, LM95245_REG_R_STATUS1, ®valh);
277 if (ret < 0)
278 return ret;
279 *val = !!(regvalh & STATUS1_ROS);
280 return 0;
281 case hwmon_temp_crit_alarm:
282 ret = regmap_read(regmap, LM95245_REG_R_STATUS1, ®valh);
283 if (ret < 0)
284 return ret;
285 *val = !!(regvalh & (channel ? STATUS1_RTCRIT : STATUS1_LOC));
286 return 0;
287 case hwmon_temp_fault:
288 ret = regmap_read(regmap, LM95245_REG_R_STATUS1, ®valh);
289 if (ret < 0)
290 return ret;
291 *val = !!(regvalh & STATUS1_DIODE_FAULT);
292 return 0;
293 default:
294 return -EOPNOTSUPP;
295 }
296}
297
298static int lm95245_write_temp(struct device *dev, u32 attr, int channel,
299 long val)
300{
301 struct lm95245_data *data = dev_get_drvdata(dev);
302 struct regmap *regmap = data->regmap;
303 unsigned int regval;
304 int ret, reg;
305
306 switch (attr) {
307 case hwmon_temp_max:
308 val = clamp_val(val / 1000, 0, 255);
309 ret = regmap_write(regmap, LM95245_REG_RW_REMOTE_OS_LIMIT, val);
310 return ret;
311 case hwmon_temp_crit:
312 reg = channel ? LM95245_REG_RW_REMOTE_TCRIT_LIMIT :
313 LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT;
314 val = clamp_val(val / 1000, 0, channel ? 255 : 127);
315 ret = regmap_write(regmap, reg, val);
316 return ret;
317 case hwmon_temp_crit_hyst:
318 mutex_lock(&data->update_lock);
319 ret = regmap_read(regmap, LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT,
320 ®val);
321 if (ret < 0) {
322 mutex_unlock(&data->update_lock);
323 return ret;
324 }
325 /* Clamp to reasonable range to prevent overflow */
326 val = clamp_val(val, -1000000, 1000000);
327 val = regval - val / 1000;
328 val = clamp_val(val, 0, 31);
329 ret = regmap_write(regmap, LM95245_REG_RW_COMMON_HYSTERESIS,
330 val);
331 mutex_unlock(&data->update_lock);
332 return ret;
333 case hwmon_temp_offset:
334 val = clamp_val(val, -128000, 127875);
335 val = val * 256 / 1000;
336 mutex_lock(&data->update_lock);
337 ret = regmap_write(regmap, LM95245_REG_RW_REMOTE_OFFL,
338 val & 0xe0);
339 if (ret < 0) {
340 mutex_unlock(&data->update_lock);
341 return ret;
342 }
343 ret = regmap_write(regmap, LM95245_REG_RW_REMOTE_OFFH,
344 (val >> 8) & 0xff);
345 mutex_unlock(&data->update_lock);
346 return ret;
347 case hwmon_temp_type:
348 if (val != 1 && val != 2)
349 return -EINVAL;
350 ret = regmap_update_bits(regmap, LM95245_REG_RW_CONFIG2,
351 CFG2_REMOTE_TT,
352 val == 1 ? CFG2_REMOTE_TT : 0);
353 return ret;
354 default:
355 return -EOPNOTSUPP;
356 }
357}
358
359static int lm95245_read_chip(struct device *dev, u32 attr, int channel,
360 long *val)
361{
362 struct lm95245_data *data = dev_get_drvdata(dev);
363
364 switch (attr) {
365 case hwmon_chip_update_interval:
366 *val = data->interval;
367 return 0;
368 default:
369 return -EOPNOTSUPP;
370 }
371}
372
373static int lm95245_write_chip(struct device *dev, u32 attr, int channel,
374 long val)
375{
376 struct lm95245_data *data = dev_get_drvdata(dev);
377 int ret;
378
379 switch (attr) {
380 case hwmon_chip_update_interval:
381 mutex_lock(&data->update_lock);
382 ret = lm95245_set_conversion_rate(data, val);
383 mutex_unlock(&data->update_lock);
384 return ret;
385 default:
386 return -EOPNOTSUPP;
387 }
388}
389
390static int lm95245_read(struct device *dev, enum hwmon_sensor_types type,
391 u32 attr, int channel, long *val)
392{
393 switch (type) {
394 case hwmon_chip:
395 return lm95245_read_chip(dev, attr, channel, val);
396 case hwmon_temp:
397 return lm95245_read_temp(dev, attr, channel, val);
398 default:
399 return -EOPNOTSUPP;
400 }
401}
402
403static int lm95245_write(struct device *dev, enum hwmon_sensor_types type,
404 u32 attr, int channel, long val)
405{
406 switch (type) {
407 case hwmon_chip:
408 return lm95245_write_chip(dev, attr, channel, val);
409 case hwmon_temp:
410 return lm95245_write_temp(dev, attr, channel, val);
411 default:
412 return -EOPNOTSUPP;
413 }
414}
415
416static umode_t lm95245_temp_is_visible(const void *data, u32 attr, int channel)
417{
418 switch (attr) {
419 case hwmon_temp_input:
420 case hwmon_temp_max_alarm:
421 case hwmon_temp_max_hyst:
422 case hwmon_temp_crit_alarm:
423 case hwmon_temp_fault:
424 return S_IRUGO;
425 case hwmon_temp_type:
426 case hwmon_temp_max:
427 case hwmon_temp_crit:
428 case hwmon_temp_offset:
429 return S_IRUGO | S_IWUSR;
430 case hwmon_temp_crit_hyst:
431 return (channel == 0) ? S_IRUGO | S_IWUSR : S_IRUGO;
432 default:
433 return 0;
434 }
435}
436
437static umode_t lm95245_is_visible(const void *data,
438 enum hwmon_sensor_types type,
439 u32 attr, int channel)
440{
441 switch (type) {
442 case hwmon_chip:
443 switch (attr) {
444 case hwmon_chip_update_interval:
445 return S_IRUGO | S_IWUSR;
446 default:
447 return 0;
448 }
449 case hwmon_temp:
450 return lm95245_temp_is_visible(data, attr, channel);
451 default:
452 return 0;
453 }
454}
455
456/* Return 0 if detection is successful, -ENODEV otherwise */
457static int lm95245_detect(struct i2c_client *new_client,
458 struct i2c_board_info *info)
459{
460 struct i2c_adapter *adapter = new_client->adapter;
461 int address = new_client->addr;
462 const char *name;
463 int rev, id;
464
465 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
466 return -ENODEV;
467
468 id = i2c_smbus_read_byte_data(new_client, LM95245_REG_R_MAN_ID);
469 if (id != MANUFACTURER_ID)
470 return -ENODEV;
471
472 rev = i2c_smbus_read_byte_data(new_client, LM95245_REG_R_CHIP_ID);
473 switch (rev) {
474 case LM95235_REVISION:
475 if (address != 0x18 && address != 0x29 && address != 0x4c)
476 return -ENODEV;
477 name = "lm95235";
478 break;
479 case LM95245_REVISION:
480 name = "lm95245";
481 break;
482 default:
483 return -ENODEV;
484 }
485
486 strlcpy(info->type, name, I2C_NAME_SIZE);
487 return 0;
488}
489
490static int lm95245_init_client(struct lm95245_data *data)
491{
492 int ret;
493
494 ret = lm95245_read_conversion_rate(data);
495 if (ret < 0)
496 return ret;
497
498 return regmap_update_bits(data->regmap, LM95245_REG_RW_CONFIG1,
499 CFG_STOP, 0);
500}
501
502static bool lm95245_is_writeable_reg(struct device *dev, unsigned int reg)
503{
504 switch (reg) {
505 case LM95245_REG_RW_CONFIG1:
506 case LM95245_REG_RW_CONVERS_RATE:
507 case LM95245_REG_W_ONE_SHOT:
508 case LM95245_REG_RW_CONFIG2:
509 case LM95245_REG_RW_REMOTE_OFFH:
510 case LM95245_REG_RW_REMOTE_OFFL:
511 case LM95245_REG_RW_REMOTE_OS_LIMIT:
512 case LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT:
513 case LM95245_REG_RW_REMOTE_TCRIT_LIMIT:
514 case LM95245_REG_RW_COMMON_HYSTERESIS:
515 return true;
516 default:
517 return false;
518 }
519}
520
521static bool lm95245_is_volatile_reg(struct device *dev, unsigned int reg)
522{
523 switch (reg) {
524 case LM95245_REG_R_STATUS1:
525 case LM95245_REG_R_STATUS2:
526 case LM95245_REG_R_LOCAL_TEMPH_S:
527 case LM95245_REG_R_LOCAL_TEMPL_S:
528 case LM95245_REG_R_REMOTE_TEMPH_S:
529 case LM95245_REG_R_REMOTE_TEMPL_S:
530 case LM95245_REG_R_REMOTE_TEMPH_U:
531 case LM95245_REG_R_REMOTE_TEMPL_U:
532 return true;
533 default:
534 return false;
535 }
536}
537
538static const struct regmap_config lm95245_regmap_config = {
539 .reg_bits = 8,
540 .val_bits = 8,
541 .writeable_reg = lm95245_is_writeable_reg,
542 .volatile_reg = lm95245_is_volatile_reg,
543 .cache_type = REGCACHE_RBTREE,
544 .use_single_rw = true,
545};
546
547static const u32 lm95245_chip_config[] = {
548 HWMON_C_UPDATE_INTERVAL,
549 0
550};
551
552static const struct hwmon_channel_info lm95245_chip = {
553 .type = hwmon_chip,
554 .config = lm95245_chip_config,
555};
556
557static const u32 lm95245_temp_config[] = {
558 HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_CRIT_ALARM,
559 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST | HWMON_T_CRIT |
560 HWMON_T_CRIT_HYST | HWMON_T_FAULT | HWMON_T_MAX_ALARM |
561 HWMON_T_CRIT_ALARM | HWMON_T_TYPE | HWMON_T_OFFSET,
562 0
563};
564
565static const struct hwmon_channel_info lm95245_temp = {
566 .type = hwmon_temp,
567 .config = lm95245_temp_config,
568};
569
570static const struct hwmon_channel_info *lm95245_info[] = {
571 &lm95245_chip,
572 &lm95245_temp,
573 NULL
574};
575
576static const struct hwmon_ops lm95245_hwmon_ops = {
577 .is_visible = lm95245_is_visible,
578 .read = lm95245_read,
579 .write = lm95245_write,
580};
581
582static const struct hwmon_chip_info lm95245_chip_info = {
583 .ops = &lm95245_hwmon_ops,
584 .info = lm95245_info,
585};
586
587static int lm95245_probe(struct i2c_client *client,
588 const struct i2c_device_id *id)
589{
590 struct device *dev = &client->dev;
591 struct lm95245_data *data;
592 struct device *hwmon_dev;
593 int ret;
594
595 data = devm_kzalloc(dev, sizeof(struct lm95245_data), GFP_KERNEL);
596 if (!data)
597 return -ENOMEM;
598
599 data->regmap = devm_regmap_init_i2c(client, &lm95245_regmap_config);
600 if (IS_ERR(data->regmap))
601 return PTR_ERR(data->regmap);
602
603 mutex_init(&data->update_lock);
604
605 /* Initialize the LM95245 chip */
606 ret = lm95245_init_client(data);
607 if (ret < 0)
608 return ret;
609
610 hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
611 data,
612 &lm95245_chip_info,
613 NULL);
614 return PTR_ERR_OR_ZERO(hwmon_dev);
615}
616
617/* Driver data (common to all clients) */
618static const struct i2c_device_id lm95245_id[] = {
619 { "lm95235", 0 },
620 { "lm95245", 0 },
621 { }
622};
623MODULE_DEVICE_TABLE(i2c, lm95245_id);
624
625static const struct of_device_id lm95245_of_match[] = {
626 { .compatible = "national,lm95235" },
627 { .compatible = "national,lm95245" },
628 { },
629};
630MODULE_DEVICE_TABLE(of, lm95245_of_match);
631
632static struct i2c_driver lm95245_driver = {
633 .class = I2C_CLASS_HWMON,
634 .driver = {
635 .name = "lm95245",
636 .of_match_table = of_match_ptr(lm95245_of_match),
637 },
638 .probe = lm95245_probe,
639 .id_table = lm95245_id,
640 .detect = lm95245_detect,
641 .address_list = normal_i2c,
642};
643
644module_i2c_driver(lm95245_driver);
645
646MODULE_AUTHOR("Alexander Stein <alexander.stein@systec-electronic.com>");
647MODULE_DESCRIPTION("LM95235/LM95245 sensor driver");
648MODULE_LICENSE("GPL");