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1 | /* |
2 | * adm1021.c - Part of lm_sensors, Linux kernel modules for hardware |
3 | * monitoring |
4 | * Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> and |
5 | * Philip Edelbrock <phil@netroedge.com> |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify |
8 | * it under the terms of the GNU General Public License as published by |
9 | * the Free Software Foundation; either version 2 of the License, or |
10 | * (at your option) any later version. |
11 | * |
12 | * This program is distributed in the hope that it will be useful, |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
15 | * GNU General Public License for more details. |
16 | * |
17 | * You should have received a copy of the GNU General Public License |
18 | * along with this program; if not, write to the Free Software |
19 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
20 | */ |
21 | |
22 | #include <linux/module.h> |
23 | #include <linux/init.h> |
24 | #include <linux/slab.h> |
25 | #include <linux/jiffies.h> |
26 | #include <linux/i2c.h> |
27 | #include <linux/hwmon.h> |
28 | #include <linux/hwmon-sysfs.h> |
29 | #include <linux/err.h> |
30 | #include <linux/mutex.h> |
31 | |
32 | |
33 | /* Addresses to scan */ |
34 | static const unsigned short normal_i2c[] = { |
35 | 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END }; |
36 | |
37 | enum chips { |
38 | adm1021, adm1023, max1617, max1617a, thmc10, lm84, gl523sm, mc1066 }; |
39 | |
40 | /* adm1021 constants specified below */ |
41 | |
42 | /* The adm1021 registers */ |
43 | /* Read-only */ |
44 | /* For nr in 0-1 */ |
45 | #define ADM1021_REG_TEMP(nr) (nr) |
46 | #define ADM1021_REG_STATUS 0x02 |
47 | /* 0x41 = AD, 0x49 = TI, 0x4D = Maxim, 0x23 = Genesys , 0x54 = Onsemi */ |
48 | #define ADM1021_REG_MAN_ID 0xFE |
49 | /* ADM1021 = 0x0X, ADM1023 = 0x3X */ |
50 | #define ADM1021_REG_DEV_ID 0xFF |
51 | /* These use different addresses for reading/writing */ |
52 | #define ADM1021_REG_CONFIG_R 0x03 |
53 | #define ADM1021_REG_CONFIG_W 0x09 |
54 | #define ADM1021_REG_CONV_RATE_R 0x04 |
55 | #define ADM1021_REG_CONV_RATE_W 0x0A |
56 | /* These are for the ADM1023's additional precision on the remote temp sensor */ |
57 | #define ADM1023_REG_REM_TEMP_PREC 0x10 |
58 | #define ADM1023_REG_REM_OFFSET 0x11 |
59 | #define ADM1023_REG_REM_OFFSET_PREC 0x12 |
60 | #define ADM1023_REG_REM_TOS_PREC 0x13 |
61 | #define ADM1023_REG_REM_THYST_PREC 0x14 |
62 | /* limits */ |
63 | /* For nr in 0-1 */ |
64 | #define ADM1021_REG_TOS_R(nr) (0x05 + 2 * (nr)) |
65 | #define ADM1021_REG_TOS_W(nr) (0x0B + 2 * (nr)) |
66 | #define ADM1021_REG_THYST_R(nr) (0x06 + 2 * (nr)) |
67 | #define ADM1021_REG_THYST_W(nr) (0x0C + 2 * (nr)) |
68 | /* write-only */ |
69 | #define ADM1021_REG_ONESHOT 0x0F |
70 | |
71 | /* Initial values */ |
72 | |
73 | /* |
74 | * Note: Even though I left the low and high limits named os and hyst, |
75 | * they don't quite work like a thermostat the way the LM75 does. I.e., |
76 | * a lower temp than THYST actually triggers an alarm instead of |
77 | * clearing it. Weird, ey? --Phil |
78 | */ |
79 | |
80 | /* Each client has this additional data */ |
81 | struct adm1021_data { |
82 | struct device *hwmon_dev; |
83 | enum chips type; |
84 | |
85 | struct mutex update_lock; |
86 | char valid; /* !=0 if following fields are valid */ |
87 | char low_power; /* !=0 if device in low power mode */ |
88 | unsigned long last_updated; /* In jiffies */ |
89 | |
90 | int temp_max[2]; /* Register values */ |
91 | int temp_min[2]; |
92 | int temp[2]; |
93 | u8 alarms; |
94 | /* Special values for ADM1023 only */ |
95 | u8 remote_temp_offset; |
96 | u8 remote_temp_offset_prec; |
97 | }; |
98 | |
99 | static int adm1021_probe(struct i2c_client *client, |
100 | const struct i2c_device_id *id); |
101 | static int adm1021_detect(struct i2c_client *client, |
102 | struct i2c_board_info *info); |
103 | static void adm1021_init_client(struct i2c_client *client); |
104 | static int adm1021_remove(struct i2c_client *client); |
105 | static struct adm1021_data *adm1021_update_device(struct device *dev); |
106 | |
107 | /* (amalysh) read only mode, otherwise any limit's writing confuse BIOS */ |
108 | static bool read_only; |
109 | |
110 | |
111 | static const struct i2c_device_id adm1021_id[] = { |
112 | { "adm1021", adm1021 }, |
113 | { "adm1023", adm1023 }, |
114 | { "max1617", max1617 }, |
115 | { "max1617a", max1617a }, |
116 | { "thmc10", thmc10 }, |
117 | { "lm84", lm84 }, |
118 | { "gl523sm", gl523sm }, |
119 | { "mc1066", mc1066 }, |
120 | { } |
121 | }; |
122 | MODULE_DEVICE_TABLE(i2c, adm1021_id); |
123 | |
124 | /* This is the driver that will be inserted */ |
125 | static struct i2c_driver adm1021_driver = { |
126 | .class = I2C_CLASS_HWMON, |
127 | .driver = { |
128 | .name = "adm1021", |
129 | }, |
130 | .probe = adm1021_probe, |
131 | .remove = adm1021_remove, |
132 | .id_table = adm1021_id, |
133 | .detect = adm1021_detect, |
134 | .address_list = normal_i2c, |
135 | }; |
136 | |
137 | static ssize_t show_temp(struct device *dev, |
138 | struct device_attribute *devattr, char *buf) |
139 | { |
140 | int index = to_sensor_dev_attr(devattr)->index; |
141 | struct adm1021_data *data = adm1021_update_device(dev); |
142 | |
143 | return sprintf(buf, "%d\n", data->temp[index]); |
144 | } |
145 | |
146 | static ssize_t show_temp_max(struct device *dev, |
147 | struct device_attribute *devattr, 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_max[index]); |
153 | } |
154 | |
155 | static ssize_t show_temp_min(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_min[index]); |
162 | } |
163 | |
164 | static ssize_t show_alarm(struct device *dev, struct device_attribute *attr, |
165 | char *buf) |
166 | { |
167 | int index = to_sensor_dev_attr(attr)->index; |
168 | struct adm1021_data *data = adm1021_update_device(dev); |
169 | return sprintf(buf, "%u\n", (data->alarms >> index) & 1); |
170 | } |
171 | |
172 | static ssize_t show_alarms(struct device *dev, |
173 | struct device_attribute *attr, |
174 | char *buf) |
175 | { |
176 | struct adm1021_data *data = adm1021_update_device(dev); |
177 | return sprintf(buf, "%u\n", data->alarms); |
178 | } |
179 | |
180 | static ssize_t set_temp_max(struct device *dev, |
181 | struct device_attribute *devattr, |
182 | const char *buf, size_t count) |
183 | { |
184 | int index = to_sensor_dev_attr(devattr)->index; |
185 | struct i2c_client *client = to_i2c_client(dev); |
186 | struct adm1021_data *data = i2c_get_clientdata(client); |
187 | long temp; |
188 | int err; |
189 | |
190 | err = kstrtol(buf, 10, &temp); |
191 | if (err) |
192 | return err; |
193 | temp /= 1000; |
194 | |
195 | mutex_lock(&data->update_lock); |
196 | data->temp_max[index] = clamp_val(temp, -128, 127); |
197 | if (!read_only) |
198 | i2c_smbus_write_byte_data(client, ADM1021_REG_TOS_W(index), |
199 | data->temp_max[index]); |
200 | mutex_unlock(&data->update_lock); |
201 | |
202 | return count; |
203 | } |
204 | |
205 | static ssize_t set_temp_min(struct device *dev, |
206 | struct device_attribute *devattr, |
207 | const char *buf, size_t count) |
208 | { |
209 | int index = to_sensor_dev_attr(devattr)->index; |
210 | struct i2c_client *client = to_i2c_client(dev); |
211 | struct adm1021_data *data = i2c_get_clientdata(client); |
212 | long temp; |
213 | int err; |
214 | |
215 | err = kstrtol(buf, 10, &temp); |
216 | if (err) |
217 | return err; |
218 | temp /= 1000; |
219 | |
220 | mutex_lock(&data->update_lock); |
221 | data->temp_min[index] = clamp_val(temp, -128, 127); |
222 | if (!read_only) |
223 | i2c_smbus_write_byte_data(client, ADM1021_REG_THYST_W(index), |
224 | data->temp_min[index]); |
225 | mutex_unlock(&data->update_lock); |
226 | |
227 | return count; |
228 | } |
229 | |
230 | static ssize_t show_low_power(struct device *dev, |
231 | struct device_attribute *devattr, char *buf) |
232 | { |
233 | struct adm1021_data *data = adm1021_update_device(dev); |
234 | return sprintf(buf, "%d\n", data->low_power); |
235 | } |
236 | |
237 | static ssize_t set_low_power(struct device *dev, |
238 | struct device_attribute *devattr, |
239 | const char *buf, size_t count) |
240 | { |
241 | struct i2c_client *client = to_i2c_client(dev); |
242 | struct adm1021_data *data = i2c_get_clientdata(client); |
243 | char low_power; |
244 | unsigned long val; |
245 | int err; |
246 | |
247 | err = kstrtoul(buf, 10, &val); |
248 | if (err) |
249 | return err; |
250 | low_power = val != 0; |
251 | |
252 | mutex_lock(&data->update_lock); |
253 | if (low_power != data->low_power) { |
254 | int config = i2c_smbus_read_byte_data( |
255 | client, ADM1021_REG_CONFIG_R); |
256 | data->low_power = low_power; |
257 | i2c_smbus_write_byte_data(client, ADM1021_REG_CONFIG_W, |
258 | (config & 0xBF) | (low_power << 6)); |
259 | } |
260 | mutex_unlock(&data->update_lock); |
261 | |
262 | return count; |
263 | } |
264 | |
265 | |
266 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); |
267 | static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max, |
268 | set_temp_max, 0); |
269 | static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp_min, |
270 | set_temp_min, 0); |
271 | static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1); |
272 | static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_max, |
273 | set_temp_max, 1); |
274 | static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp_min, |
275 | set_temp_min, 1); |
276 | static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6); |
277 | static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 5); |
278 | static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4); |
279 | static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3); |
280 | static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2); |
281 | |
282 | static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); |
283 | static DEVICE_ATTR(low_power, S_IWUSR | S_IRUGO, show_low_power, set_low_power); |
284 | |
285 | static struct attribute *adm1021_attributes[] = { |
286 | &sensor_dev_attr_temp1_max.dev_attr.attr, |
287 | &sensor_dev_attr_temp1_min.dev_attr.attr, |
288 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
289 | &sensor_dev_attr_temp2_max.dev_attr.attr, |
290 | &sensor_dev_attr_temp2_min.dev_attr.attr, |
291 | &sensor_dev_attr_temp2_input.dev_attr.attr, |
292 | &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, |
293 | &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, |
294 | &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, |
295 | &sensor_dev_attr_temp2_min_alarm.dev_attr.attr, |
296 | &sensor_dev_attr_temp2_fault.dev_attr.attr, |
297 | &dev_attr_alarms.attr, |
298 | &dev_attr_low_power.attr, |
299 | NULL |
300 | }; |
301 | |
302 | static const struct attribute_group adm1021_group = { |
303 | .attrs = adm1021_attributes, |
304 | }; |
305 | |
306 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
307 | static int adm1021_detect(struct i2c_client *client, |
308 | struct i2c_board_info *info) |
309 | { |
310 | struct i2c_adapter *adapter = client->adapter; |
311 | const char *type_name; |
312 | int conv_rate, status, config, man_id, dev_id; |
313 | |
314 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { |
315 | pr_debug("adm1021: detect failed, " |
316 | "smbus byte data not supported!\n"); |
317 | return -ENODEV; |
318 | } |
319 | |
320 | status = i2c_smbus_read_byte_data(client, ADM1021_REG_STATUS); |
321 | conv_rate = i2c_smbus_read_byte_data(client, |
322 | ADM1021_REG_CONV_RATE_R); |
323 | config = i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R); |
324 | |
325 | /* Check unused bits */ |
326 | if ((status & 0x03) || (config & 0x3F) || (conv_rate & 0xF8)) { |
327 | pr_debug("adm1021: detect failed, chip not detected!\n"); |
328 | return -ENODEV; |
329 | } |
330 | |
331 | /* Determine the chip type. */ |
332 | man_id = i2c_smbus_read_byte_data(client, ADM1021_REG_MAN_ID); |
333 | dev_id = i2c_smbus_read_byte_data(client, ADM1021_REG_DEV_ID); |
334 | |
335 | if (man_id == 0x4d && dev_id == 0x01) |
336 | type_name = "max1617a"; |
337 | else if (man_id == 0x41) { |
338 | if ((dev_id & 0xF0) == 0x30) |
339 | type_name = "adm1023"; |
340 | else |
341 | type_name = "adm1021"; |
342 | } else if (man_id == 0x49) |
343 | type_name = "thmc10"; |
344 | else if (man_id == 0x23) |
345 | type_name = "gl523sm"; |
346 | else if (man_id == 0x54) |
347 | type_name = "mc1066"; |
348 | /* LM84 Mfr ID in a different place, and it has more unused bits */ |
349 | else if (conv_rate == 0x00 |
350 | && (config & 0x7F) == 0x00 |
351 | && (status & 0xAB) == 0x00) |
352 | type_name = "lm84"; |
353 | else |
354 | type_name = "max1617"; |
355 | |
356 | pr_debug("adm1021: Detected chip %s at adapter %d, address 0x%02x.\n", |
357 | type_name, i2c_adapter_id(adapter), client->addr); |
358 | strlcpy(info->type, type_name, I2C_NAME_SIZE); |
359 | |
360 | return 0; |
361 | } |
362 | |
363 | static int adm1021_probe(struct i2c_client *client, |
364 | const struct i2c_device_id *id) |
365 | { |
366 | struct adm1021_data *data; |
367 | int err; |
368 | |
369 | data = devm_kzalloc(&client->dev, sizeof(struct adm1021_data), |
370 | GFP_KERNEL); |
371 | if (!data) { |
372 | pr_debug("adm1021: detect failed, devm_kzalloc failed!\n"); |
373 | return -ENOMEM; |
374 | } |
375 | |
376 | i2c_set_clientdata(client, data); |
377 | data->type = id->driver_data; |
378 | mutex_init(&data->update_lock); |
379 | |
380 | /* Initialize the ADM1021 chip */ |
381 | if (data->type != lm84 && !read_only) |
382 | adm1021_init_client(client); |
383 | |
384 | /* Register sysfs hooks */ |
385 | err = sysfs_create_group(&client->dev.kobj, &adm1021_group); |
386 | if (err) |
387 | return err; |
388 | |
389 | data->hwmon_dev = hwmon_device_register(&client->dev); |
390 | if (IS_ERR(data->hwmon_dev)) { |
391 | err = PTR_ERR(data->hwmon_dev); |
392 | goto error; |
393 | } |
394 | |
395 | return 0; |
396 | |
397 | error: |
398 | sysfs_remove_group(&client->dev.kobj, &adm1021_group); |
399 | return err; |
400 | } |
401 | |
402 | static void adm1021_init_client(struct i2c_client *client) |
403 | { |
404 | /* Enable ADC and disable suspend mode */ |
405 | i2c_smbus_write_byte_data(client, ADM1021_REG_CONFIG_W, |
406 | i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R) & 0xBF); |
407 | /* Set Conversion rate to 1/sec (this can be tinkered with) */ |
408 | i2c_smbus_write_byte_data(client, ADM1021_REG_CONV_RATE_W, 0x04); |
409 | } |
410 | |
411 | static int adm1021_remove(struct i2c_client *client) |
412 | { |
413 | struct adm1021_data *data = i2c_get_clientdata(client); |
414 | |
415 | hwmon_device_unregister(data->hwmon_dev); |
416 | sysfs_remove_group(&client->dev.kobj, &adm1021_group); |
417 | |
418 | return 0; |
419 | } |
420 | |
421 | static struct adm1021_data *adm1021_update_device(struct device *dev) |
422 | { |
423 | struct i2c_client *client = to_i2c_client(dev); |
424 | struct adm1021_data *data = i2c_get_clientdata(client); |
425 | |
426 | mutex_lock(&data->update_lock); |
427 | |
428 | if (time_after(jiffies, data->last_updated + HZ + HZ / 2) |
429 | || !data->valid) { |
430 | int i; |
431 | |
432 | dev_dbg(&client->dev, "Starting adm1021 update\n"); |
433 | |
434 | for (i = 0; i < 2; i++) { |
435 | data->temp[i] = 1000 * |
436 | (s8) i2c_smbus_read_byte_data( |
437 | client, ADM1021_REG_TEMP(i)); |
438 | data->temp_max[i] = 1000 * |
439 | (s8) i2c_smbus_read_byte_data( |
440 | client, ADM1021_REG_TOS_R(i)); |
441 | data->temp_min[i] = 1000 * |
442 | (s8) i2c_smbus_read_byte_data( |
443 | client, ADM1021_REG_THYST_R(i)); |
444 | } |
445 | data->alarms = i2c_smbus_read_byte_data(client, |
446 | ADM1021_REG_STATUS) & 0x7c; |
447 | if (data->type == adm1023) { |
448 | /* |
449 | * The ADM1023 provides 3 extra bits of precision for |
450 | * the remote sensor in extra registers. |
451 | */ |
452 | data->temp[1] += 125 * (i2c_smbus_read_byte_data( |
453 | client, ADM1023_REG_REM_TEMP_PREC) >> 5); |
454 | data->temp_max[1] += 125 * (i2c_smbus_read_byte_data( |
455 | client, ADM1023_REG_REM_TOS_PREC) >> 5); |
456 | data->temp_min[1] += 125 * (i2c_smbus_read_byte_data( |
457 | client, ADM1023_REG_REM_THYST_PREC) >> 5); |
458 | data->remote_temp_offset = |
459 | i2c_smbus_read_byte_data(client, |
460 | ADM1023_REG_REM_OFFSET); |
461 | data->remote_temp_offset_prec = |
462 | i2c_smbus_read_byte_data(client, |
463 | ADM1023_REG_REM_OFFSET_PREC); |
464 | } |
465 | data->last_updated = jiffies; |
466 | data->valid = 1; |
467 | } |
468 | |
469 | mutex_unlock(&data->update_lock); |
470 | |
471 | return data; |
472 | } |
473 | |
474 | module_i2c_driver(adm1021_driver); |
475 | |
476 | MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and " |
477 | "Philip Edelbrock <phil@netroedge.com>"); |
478 | MODULE_DESCRIPTION("adm1021 driver"); |
479 | MODULE_LICENSE("GPL"); |
480 | |
481 | module_param(read_only, bool, 0); |
482 | MODULE_PARM_DESC(read_only, "Don't set any values, read only mode"); |
483 |
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