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fffd80cc AS |
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 | ||
39 | static 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 | ||
103 | static 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) */ | |
117 | struct lm95245_data { | |
7276d55e | 118 | struct i2c_client *client; |
fffd80cc AS |
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 */ | |
129 | static int temp_from_reg_unsigned(u8 val_h, u8 val_l) | |
130 | { | |
131 | return val_h * 1000 + val_l * 1000 / 256; | |
132 | } | |
133 | ||
134 | static 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 | ||
141 | static struct lm95245_data *lm95245_update_device(struct device *dev) | |
142 | { | |
7276d55e GR |
143 | struct lm95245_data *data = dev_get_drvdata(dev); |
144 | struct i2c_client *client = data->client; | |
fffd80cc AS |
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 | ||
fffd80cc AS |
152 | for (i = 0; i < ARRAY_SIZE(lm95245_reg_address); i++) |
153 | data->regs[i] | |
154 | = i2c_smbus_read_byte_data(client, | |
155 | lm95245_reg_address[i]); | |
156 | data->last_updated = jiffies; | |
157 | data->valid = 1; | |
158 | } | |
159 | ||
160 | mutex_unlock(&data->update_lock); | |
161 | ||
162 | return data; | |
163 | } | |
164 | ||
165 | static unsigned long lm95245_read_conversion_rate(struct i2c_client *client) | |
166 | { | |
167 | int rate; | |
168 | unsigned long interval; | |
169 | ||
170 | rate = i2c_smbus_read_byte_data(client, LM95245_REG_RW_CONVERS_RATE); | |
171 | ||
172 | switch (rate) { | |
173 | case RATE_CR0063: | |
174 | interval = 63; | |
175 | break; | |
176 | case RATE_CR0364: | |
177 | interval = 364; | |
178 | break; | |
179 | case RATE_CR1000: | |
180 | interval = 1000; | |
181 | break; | |
182 | case RATE_CR2500: | |
183 | default: | |
184 | interval = 2500; | |
185 | break; | |
186 | } | |
187 | ||
188 | return interval; | |
189 | } | |
190 | ||
191 | static unsigned long lm95245_set_conversion_rate(struct i2c_client *client, | |
192 | unsigned long interval) | |
193 | { | |
194 | int rate; | |
195 | ||
196 | if (interval <= 63) { | |
197 | interval = 63; | |
198 | rate = RATE_CR0063; | |
199 | } else if (interval <= 364) { | |
200 | interval = 364; | |
201 | rate = RATE_CR0364; | |
202 | } else if (interval <= 1000) { | |
203 | interval = 1000; | |
204 | rate = RATE_CR1000; | |
205 | } else { | |
206 | interval = 2500; | |
207 | rate = RATE_CR2500; | |
208 | } | |
209 | ||
210 | i2c_smbus_write_byte_data(client, LM95245_REG_RW_CONVERS_RATE, rate); | |
211 | ||
212 | return interval; | |
213 | } | |
214 | ||
215 | /* Sysfs stuff */ | |
216 | static ssize_t show_input(struct device *dev, struct device_attribute *attr, | |
217 | char *buf) | |
218 | { | |
219 | struct lm95245_data *data = lm95245_update_device(dev); | |
220 | int temp; | |
221 | int index = to_sensor_dev_attr(attr)->index; | |
222 | ||
223 | /* | |
224 | * Index 0 (Local temp) is always signed | |
225 | * Index 2 (Remote temp) has both signed and unsigned data | |
226 | * use signed calculation for remote if signed bit is set | |
227 | */ | |
228 | if (index == 0 || data->regs[index] & 0x80) | |
229 | temp = temp_from_reg_signed(data->regs[index], | |
230 | data->regs[index + 1]); | |
231 | else | |
232 | temp = temp_from_reg_unsigned(data->regs[index + 2], | |
233 | data->regs[index + 3]); | |
234 | ||
235 | return snprintf(buf, PAGE_SIZE - 1, "%d\n", temp); | |
236 | } | |
237 | ||
238 | static ssize_t show_limit(struct device *dev, struct device_attribute *attr, | |
239 | char *buf) | |
240 | { | |
241 | struct lm95245_data *data = lm95245_update_device(dev); | |
242 | int index = to_sensor_dev_attr(attr)->index; | |
243 | ||
244 | return snprintf(buf, PAGE_SIZE - 1, "%d\n", | |
245 | data->regs[index] * 1000); | |
246 | } | |
247 | ||
248 | static ssize_t set_limit(struct device *dev, struct device_attribute *attr, | |
249 | const char *buf, size_t count) | |
250 | { | |
7276d55e | 251 | struct lm95245_data *data = dev_get_drvdata(dev); |
fffd80cc | 252 | int index = to_sensor_dev_attr(attr)->index; |
7276d55e | 253 | struct i2c_client *client = data->client; |
fffd80cc AS |
254 | unsigned long val; |
255 | ||
179c4fdb | 256 | if (kstrtoul(buf, 10, &val) < 0) |
fffd80cc AS |
257 | return -EINVAL; |
258 | ||
259 | val /= 1000; | |
260 | ||
2a844c14 | 261 | val = clamp_val(val, 0, (index == 6 ? 127 : 255)); |
fffd80cc AS |
262 | |
263 | mutex_lock(&data->update_lock); | |
264 | ||
265 | data->valid = 0; | |
266 | ||
267 | i2c_smbus_write_byte_data(client, lm95245_reg_address[index], val); | |
268 | ||
269 | mutex_unlock(&data->update_lock); | |
270 | ||
271 | return count; | |
272 | } | |
273 | ||
408c15ea GR |
274 | static ssize_t show_crit_hyst(struct device *dev, struct device_attribute *attr, |
275 | char *buf) | |
276 | { | |
277 | struct lm95245_data *data = lm95245_update_device(dev); | |
278 | int index = to_sensor_dev_attr(attr)->index; | |
279 | int hyst = data->regs[index] - data->regs[8]; | |
280 | ||
281 | return snprintf(buf, PAGE_SIZE - 1, "%d\n", hyst * 1000); | |
282 | } | |
283 | ||
fffd80cc AS |
284 | static ssize_t set_crit_hyst(struct device *dev, struct device_attribute *attr, |
285 | const char *buf, size_t count) | |
286 | { | |
7276d55e | 287 | struct lm95245_data *data = dev_get_drvdata(dev); |
408c15ea | 288 | int index = to_sensor_dev_attr(attr)->index; |
7276d55e | 289 | struct i2c_client *client = data->client; |
fffd80cc | 290 | unsigned long val; |
408c15ea | 291 | int hyst, limit; |
fffd80cc | 292 | |
179c4fdb | 293 | if (kstrtoul(buf, 10, &val) < 0) |
fffd80cc AS |
294 | return -EINVAL; |
295 | ||
fffd80cc AS |
296 | mutex_lock(&data->update_lock); |
297 | ||
408c15ea GR |
298 | limit = i2c_smbus_read_byte_data(client, lm95245_reg_address[index]); |
299 | hyst = limit - val / 1000; | |
300 | hyst = clamp_val(hyst, 0, 31); | |
301 | data->regs[8] = hyst; | |
fffd80cc AS |
302 | |
303 | /* shared crit hysteresis */ | |
304 | i2c_smbus_write_byte_data(client, LM95245_REG_RW_COMMON_HYSTERESIS, | |
408c15ea | 305 | hyst); |
fffd80cc AS |
306 | |
307 | mutex_unlock(&data->update_lock); | |
308 | ||
309 | return count; | |
310 | } | |
311 | ||
312 | static ssize_t show_type(struct device *dev, struct device_attribute *attr, | |
313 | char *buf) | |
314 | { | |
7276d55e | 315 | struct lm95245_data *data = dev_get_drvdata(dev); |
fffd80cc AS |
316 | |
317 | return snprintf(buf, PAGE_SIZE - 1, | |
318 | data->config2 & CFG2_REMOTE_TT ? "1\n" : "2\n"); | |
319 | } | |
320 | ||
321 | static ssize_t set_type(struct device *dev, struct device_attribute *attr, | |
322 | const char *buf, size_t count) | |
323 | { | |
7276d55e GR |
324 | struct lm95245_data *data = dev_get_drvdata(dev); |
325 | struct i2c_client *client = data->client; | |
fffd80cc AS |
326 | unsigned long val; |
327 | ||
179c4fdb | 328 | if (kstrtoul(buf, 10, &val) < 0) |
fffd80cc AS |
329 | return -EINVAL; |
330 | if (val != 1 && val != 2) | |
331 | return -EINVAL; | |
332 | ||
333 | mutex_lock(&data->update_lock); | |
334 | ||
335 | if (val == 1) | |
336 | data->config2 |= CFG2_REMOTE_TT; | |
337 | else | |
338 | data->config2 &= ~CFG2_REMOTE_TT; | |
339 | ||
340 | data->valid = 0; | |
341 | ||
342 | i2c_smbus_write_byte_data(client, LM95245_REG_RW_CONFIG2, | |
343 | data->config2); | |
344 | ||
345 | mutex_unlock(&data->update_lock); | |
346 | ||
347 | return count; | |
348 | } | |
349 | ||
350 | static ssize_t show_alarm(struct device *dev, struct device_attribute *attr, | |
351 | char *buf) | |
352 | { | |
353 | struct lm95245_data *data = lm95245_update_device(dev); | |
354 | int index = to_sensor_dev_attr(attr)->index; | |
355 | ||
356 | return snprintf(buf, PAGE_SIZE - 1, "%d\n", | |
357 | !!(data->regs[9] & index)); | |
358 | } | |
359 | ||
360 | static ssize_t show_interval(struct device *dev, struct device_attribute *attr, | |
361 | char *buf) | |
362 | { | |
363 | struct lm95245_data *data = lm95245_update_device(dev); | |
364 | ||
365 | return snprintf(buf, PAGE_SIZE - 1, "%lu\n", data->interval); | |
366 | } | |
367 | ||
368 | static ssize_t set_interval(struct device *dev, struct device_attribute *attr, | |
369 | const char *buf, size_t count) | |
370 | { | |
7276d55e GR |
371 | struct lm95245_data *data = dev_get_drvdata(dev); |
372 | struct i2c_client *client = data->client; | |
fffd80cc AS |
373 | unsigned long val; |
374 | ||
179c4fdb | 375 | if (kstrtoul(buf, 10, &val) < 0) |
fffd80cc AS |
376 | return -EINVAL; |
377 | ||
378 | mutex_lock(&data->update_lock); | |
379 | ||
380 | data->interval = lm95245_set_conversion_rate(client, val); | |
381 | ||
382 | mutex_unlock(&data->update_lock); | |
383 | ||
384 | return count; | |
385 | } | |
386 | ||
387 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_input, NULL, 0); | |
388 | static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_limit, | |
389 | set_limit, 6); | |
408c15ea GR |
390 | static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_crit_hyst, |
391 | set_crit_hyst, 6); | |
fffd80cc AS |
392 | static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, |
393 | STATUS1_LOC); | |
394 | ||
395 | static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_input, NULL, 2); | |
396 | static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_limit, | |
397 | set_limit, 7); | |
a41a8927 | 398 | static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_crit_hyst, NULL, 7); |
fffd80cc AS |
399 | static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, |
400 | STATUS1_RTCRIT); | |
401 | static SENSOR_DEVICE_ATTR(temp2_type, S_IWUSR | S_IRUGO, show_type, | |
402 | set_type, 0); | |
403 | static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, | |
404 | STATUS1_DIODE_FAULT); | |
405 | ||
406 | static DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO, show_interval, | |
407 | set_interval); | |
408 | ||
7276d55e | 409 | static struct attribute *lm95245_attrs[] = { |
fffd80cc AS |
410 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
411 | &sensor_dev_attr_temp1_crit.dev_attr.attr, | |
412 | &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr, | |
413 | &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, | |
414 | &sensor_dev_attr_temp2_input.dev_attr.attr, | |
415 | &sensor_dev_attr_temp2_crit.dev_attr.attr, | |
416 | &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr, | |
417 | &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr, | |
418 | &sensor_dev_attr_temp2_type.dev_attr.attr, | |
419 | &sensor_dev_attr_temp2_fault.dev_attr.attr, | |
420 | &dev_attr_update_interval.attr, | |
421 | NULL | |
422 | }; | |
7276d55e | 423 | ATTRIBUTE_GROUPS(lm95245); |
fffd80cc AS |
424 | |
425 | /* Return 0 if detection is successful, -ENODEV otherwise */ | |
426 | static int lm95245_detect(struct i2c_client *new_client, | |
427 | struct i2c_board_info *info) | |
428 | { | |
429 | struct i2c_adapter *adapter = new_client->adapter; | |
430 | ||
431 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
432 | return -ENODEV; | |
433 | ||
434 | if (i2c_smbus_read_byte_data(new_client, LM95245_REG_R_MAN_ID) | |
435 | != MANUFACTURER_ID | |
436 | || i2c_smbus_read_byte_data(new_client, LM95245_REG_R_CHIP_ID) | |
437 | != DEFAULT_REVISION) | |
438 | return -ENODEV; | |
439 | ||
440 | strlcpy(info->type, DEVNAME, I2C_NAME_SIZE); | |
441 | return 0; | |
442 | } | |
443 | ||
7276d55e GR |
444 | static void lm95245_init_client(struct i2c_client *client, |
445 | struct lm95245_data *data) | |
fffd80cc | 446 | { |
fffd80cc AS |
447 | data->interval = lm95245_read_conversion_rate(client); |
448 | ||
449 | data->config1 = i2c_smbus_read_byte_data(client, | |
450 | LM95245_REG_RW_CONFIG1); | |
451 | data->config2 = i2c_smbus_read_byte_data(client, | |
452 | LM95245_REG_RW_CONFIG2); | |
453 | ||
454 | if (data->config1 & CFG_STOP) { | |
455 | /* Clear the standby bit */ | |
456 | data->config1 &= ~CFG_STOP; | |
457 | i2c_smbus_write_byte_data(client, LM95245_REG_RW_CONFIG1, | |
458 | data->config1); | |
459 | } | |
460 | } | |
461 | ||
7276d55e | 462 | static int lm95245_probe(struct i2c_client *client, |
fffd80cc AS |
463 | const struct i2c_device_id *id) |
464 | { | |
7276d55e | 465 | struct device *dev = &client->dev; |
fffd80cc | 466 | struct lm95245_data *data; |
7276d55e | 467 | struct device *hwmon_dev; |
fffd80cc | 468 | |
7276d55e | 469 | data = devm_kzalloc(dev, sizeof(struct lm95245_data), GFP_KERNEL); |
a8dd946c GR |
470 | if (!data) |
471 | return -ENOMEM; | |
fffd80cc | 472 | |
7276d55e | 473 | data->client = client; |
fffd80cc AS |
474 | mutex_init(&data->update_lock); |
475 | ||
476 | /* Initialize the LM95245 chip */ | |
7276d55e | 477 | lm95245_init_client(client, data); |
fffd80cc | 478 | |
7276d55e GR |
479 | hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, |
480 | data, | |
481 | lm95245_groups); | |
482 | return PTR_ERR_OR_ZERO(hwmon_dev); | |
fffd80cc AS |
483 | } |
484 | ||
485 | /* Driver data (common to all clients) */ | |
486 | static const struct i2c_device_id lm95245_id[] = { | |
487 | { DEVNAME, 0 }, | |
488 | { } | |
489 | }; | |
490 | MODULE_DEVICE_TABLE(i2c, lm95245_id); | |
491 | ||
492 | static struct i2c_driver lm95245_driver = { | |
493 | .class = I2C_CLASS_HWMON, | |
494 | .driver = { | |
495 | .name = DEVNAME, | |
496 | }, | |
497 | .probe = lm95245_probe, | |
fffd80cc AS |
498 | .id_table = lm95245_id, |
499 | .detect = lm95245_detect, | |
500 | .address_list = normal_i2c, | |
501 | }; | |
502 | ||
f0967eea | 503 | module_i2c_driver(lm95245_driver); |
fffd80cc AS |
504 | |
505 | MODULE_AUTHOR("Alexander Stein <alexander.stein@systec-electronic.com>"); | |
506 | MODULE_DESCRIPTION("LM95245 sensor driver"); | |
507 | MODULE_LICENSE("GPL"); |