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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 | /* Note: Even though I left the low and high limits named os and hyst, |
74 | they don't quite work like a thermostat the way the LM75 does. I.e., |
75 | a lower temp than THYST actually triggers an alarm instead of |
76 | clearing it. Weird, ey? --Phil */ |
77 | |
78 | /* Each client has this additional data */ |
79 | struct adm1021_data { |
80 | struct device *hwmon_dev; |
81 | enum chips type; |
82 | |
83 | struct mutex update_lock; |
84 | char valid; /* !=0 if following fields are valid */ |
85 | char low_power; /* !=0 if device in low power mode */ |
86 | unsigned long last_updated; /* In jiffies */ |
87 | |
88 | int temp_max[2]; /* Register values */ |
89 | int temp_min[2]; |
90 | int temp[2]; |
91 | u8 alarms; |
92 | /* Special values for ADM1023 only */ |
93 | u8 remote_temp_offset; |
94 | u8 remote_temp_offset_prec; |
95 | }; |
96 | |
97 | static int adm1021_probe(struct i2c_client *client, |
98 | const struct i2c_device_id *id); |
99 | static int adm1021_detect(struct i2c_client *client, |
100 | struct i2c_board_info *info); |
101 | static void adm1021_init_client(struct i2c_client *client); |
102 | static int adm1021_remove(struct i2c_client *client); |
103 | static struct adm1021_data *adm1021_update_device(struct device *dev); |
104 | |
105 | /* (amalysh) read only mode, otherwise any limit's writing confuse BIOS */ |
106 | static int read_only; |
107 | |
108 | |
109 | static const struct i2c_device_id adm1021_id[] = { |
110 | { "adm1021", adm1021 }, |
111 | { "adm1023", adm1023 }, |
112 | { "max1617", max1617 }, |
113 | { "max1617a", max1617a }, |
114 | { "thmc10", thmc10 }, |
115 | { "lm84", lm84 }, |
116 | { "gl523sm", gl523sm }, |
117 | { "mc1066", mc1066 }, |
118 | { } |
119 | }; |
120 | MODULE_DEVICE_TABLE(i2c, adm1021_id); |
121 | |
122 | /* This is the driver that will be inserted */ |
123 | static struct i2c_driver adm1021_driver = { |
124 | .class = I2C_CLASS_HWMON, |
125 | .driver = { |
126 | .name = "adm1021", |
127 | }, |
128 | .probe = adm1021_probe, |
129 | .remove = adm1021_remove, |
130 | .id_table = adm1021_id, |
131 | .detect = adm1021_detect, |
132 | .address_list = normal_i2c, |
133 | }; |
134 | |
135 | static ssize_t show_temp(struct device *dev, |
136 | struct device_attribute *devattr, char *buf) |
137 | { |
138 | int index = to_sensor_dev_attr(devattr)->index; |
139 | struct adm1021_data *data = adm1021_update_device(dev); |
140 | |
141 | return sprintf(buf, "%d\n", data->temp[index]); |
142 | } |
143 | |
144 | static ssize_t show_temp_max(struct device *dev, |
145 | struct device_attribute *devattr, char *buf) |
146 | { |
147 | int index = to_sensor_dev_attr(devattr)->index; |
148 | struct adm1021_data *data = adm1021_update_device(dev); |
149 | |
150 | return sprintf(buf, "%d\n", data->temp_max[index]); |
151 | } |
152 | |
153 | static ssize_t show_temp_min(struct device *dev, |
154 | struct device_attribute *devattr, char *buf) |
155 | { |
156 | int index = to_sensor_dev_attr(devattr)->index; |
157 | struct adm1021_data *data = adm1021_update_device(dev); |
158 | |
159 | return sprintf(buf, "%d\n", data->temp_min[index]); |
160 | } |
161 | |
162 | static ssize_t show_alarm(struct device *dev, struct device_attribute *attr, |
163 | char *buf) |
164 | { |
165 | int index = to_sensor_dev_attr(attr)->index; |
166 | struct adm1021_data *data = adm1021_update_device(dev); |
167 | return sprintf(buf, "%u\n", (data->alarms >> index) & 1); |
168 | } |
169 | |
170 | static ssize_t show_alarms(struct device *dev, |
171 | struct device_attribute *attr, |
172 | char *buf) |
173 | { |
174 | struct adm1021_data *data = adm1021_update_device(dev); |
175 | return sprintf(buf, "%u\n", data->alarms); |
176 | } |
177 | |
178 | static ssize_t set_temp_max(struct device *dev, |
179 | struct device_attribute *devattr, |
180 | const char *buf, size_t count) |
181 | { |
182 | int index = to_sensor_dev_attr(devattr)->index; |
183 | struct i2c_client *client = to_i2c_client(dev); |
184 | struct adm1021_data *data = i2c_get_clientdata(client); |
185 | long temp = simple_strtol(buf, NULL, 10) / 1000; |
186 | |
187 | mutex_lock(&data->update_lock); |
188 | data->temp_max[index] = SENSORS_LIMIT(temp, -128, 127); |
189 | if (!read_only) |
190 | i2c_smbus_write_byte_data(client, ADM1021_REG_TOS_W(index), |
191 | data->temp_max[index]); |
192 | mutex_unlock(&data->update_lock); |
193 | |
194 | return count; |
195 | } |
196 | |
197 | static ssize_t set_temp_min(struct device *dev, |
198 | struct device_attribute *devattr, |
199 | const char *buf, size_t count) |
200 | { |
201 | int index = to_sensor_dev_attr(devattr)->index; |
202 | struct i2c_client *client = to_i2c_client(dev); |
203 | struct adm1021_data *data = i2c_get_clientdata(client); |
204 | long temp = simple_strtol(buf, NULL, 10) / 1000; |
205 | |
206 | mutex_lock(&data->update_lock); |
207 | data->temp_min[index] = SENSORS_LIMIT(temp, -128, 127); |
208 | if (!read_only) |
209 | i2c_smbus_write_byte_data(client, ADM1021_REG_THYST_W(index), |
210 | data->temp_min[index]); |
211 | mutex_unlock(&data->update_lock); |
212 | |
213 | return count; |
214 | } |
215 | |
216 | static ssize_t show_low_power(struct device *dev, |
217 | struct device_attribute *devattr, char *buf) |
218 | { |
219 | struct adm1021_data *data = adm1021_update_device(dev); |
220 | return sprintf(buf, "%d\n", data->low_power); |
221 | } |
222 | |
223 | static ssize_t set_low_power(struct device *dev, |
224 | struct device_attribute *devattr, |
225 | const char *buf, size_t count) |
226 | { |
227 | struct i2c_client *client = to_i2c_client(dev); |
228 | struct adm1021_data *data = i2c_get_clientdata(client); |
229 | int low_power = simple_strtol(buf, NULL, 10) != 0; |
230 | |
231 | mutex_lock(&data->update_lock); |
232 | if (low_power != data->low_power) { |
233 | int config = i2c_smbus_read_byte_data( |
234 | client, ADM1021_REG_CONFIG_R); |
235 | data->low_power = low_power; |
236 | i2c_smbus_write_byte_data(client, ADM1021_REG_CONFIG_W, |
237 | (config & 0xBF) | (low_power << 6)); |
238 | } |
239 | mutex_unlock(&data->update_lock); |
240 | |
241 | return count; |
242 | } |
243 | |
244 | |
245 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); |
246 | static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max, |
247 | set_temp_max, 0); |
248 | static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp_min, |
249 | set_temp_min, 0); |
250 | static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1); |
251 | static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_max, |
252 | set_temp_max, 1); |
253 | static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp_min, |
254 | set_temp_min, 1); |
255 | static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6); |
256 | static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 5); |
257 | static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4); |
258 | static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3); |
259 | static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2); |
260 | |
261 | static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); |
262 | static DEVICE_ATTR(low_power, S_IWUSR | S_IRUGO, show_low_power, set_low_power); |
263 | |
264 | static struct attribute *adm1021_attributes[] = { |
265 | &sensor_dev_attr_temp1_max.dev_attr.attr, |
266 | &sensor_dev_attr_temp1_min.dev_attr.attr, |
267 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
268 | &sensor_dev_attr_temp2_max.dev_attr.attr, |
269 | &sensor_dev_attr_temp2_min.dev_attr.attr, |
270 | &sensor_dev_attr_temp2_input.dev_attr.attr, |
271 | &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, |
272 | &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, |
273 | &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, |
274 | &sensor_dev_attr_temp2_min_alarm.dev_attr.attr, |
275 | &sensor_dev_attr_temp2_fault.dev_attr.attr, |
276 | &dev_attr_alarms.attr, |
277 | &dev_attr_low_power.attr, |
278 | NULL |
279 | }; |
280 | |
281 | static const struct attribute_group adm1021_group = { |
282 | .attrs = adm1021_attributes, |
283 | }; |
284 | |
285 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
286 | static int adm1021_detect(struct i2c_client *client, |
287 | struct i2c_board_info *info) |
288 | { |
289 | struct i2c_adapter *adapter = client->adapter; |
290 | const char *type_name; |
291 | int conv_rate, status, config, man_id, dev_id; |
292 | |
293 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { |
294 | pr_debug("adm1021: detect failed, " |
295 | "smbus byte data not supported!\n"); |
296 | return -ENODEV; |
297 | } |
298 | |
299 | status = i2c_smbus_read_byte_data(client, ADM1021_REG_STATUS); |
300 | conv_rate = i2c_smbus_read_byte_data(client, |
301 | ADM1021_REG_CONV_RATE_R); |
302 | config = i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R); |
303 | |
304 | /* Check unused bits */ |
305 | if ((status & 0x03) || (config & 0x3F) || (conv_rate & 0xF8)) { |
306 | pr_debug("adm1021: detect failed, chip not detected!\n"); |
307 | return -ENODEV; |
308 | } |
309 | |
310 | /* Determine the chip type. */ |
311 | man_id = i2c_smbus_read_byte_data(client, ADM1021_REG_MAN_ID); |
312 | dev_id = i2c_smbus_read_byte_data(client, ADM1021_REG_DEV_ID); |
313 | |
314 | if (man_id == 0x4d && dev_id == 0x01) |
315 | type_name = "max1617a"; |
316 | else if (man_id == 0x41) { |
317 | if ((dev_id & 0xF0) == 0x30) |
318 | type_name = "adm1023"; |
319 | else |
320 | type_name = "adm1021"; |
321 | } else if (man_id == 0x49) |
322 | type_name = "thmc10"; |
323 | else if (man_id == 0x23) |
324 | type_name = "gl523sm"; |
325 | else if (man_id == 0x54) |
326 | type_name = "mc1066"; |
327 | /* LM84 Mfr ID in a different place, and it has more unused bits */ |
328 | else if (conv_rate == 0x00 |
329 | && (config & 0x7F) == 0x00 |
330 | && (status & 0xAB) == 0x00) |
331 | type_name = "lm84"; |
332 | else |
333 | type_name = "max1617"; |
334 | |
335 | pr_debug("adm1021: Detected chip %s at adapter %d, address 0x%02x.\n", |
336 | type_name, i2c_adapter_id(adapter), client->addr); |
337 | strlcpy(info->type, type_name, I2C_NAME_SIZE); |
338 | |
339 | return 0; |
340 | } |
341 | |
342 | static int adm1021_probe(struct i2c_client *client, |
343 | const struct i2c_device_id *id) |
344 | { |
345 | struct adm1021_data *data; |
346 | int err; |
347 | |
348 | data = kzalloc(sizeof(struct adm1021_data), GFP_KERNEL); |
349 | if (!data) { |
350 | pr_debug("adm1021: detect failed, kzalloc failed!\n"); |
351 | err = -ENOMEM; |
352 | goto error0; |
353 | } |
354 | |
355 | i2c_set_clientdata(client, data); |
356 | data->type = id->driver_data; |
357 | mutex_init(&data->update_lock); |
358 | |
359 | /* Initialize the ADM1021 chip */ |
360 | if (data->type != lm84 && !read_only) |
361 | adm1021_init_client(client); |
362 | |
363 | /* Register sysfs hooks */ |
364 | if ((err = sysfs_create_group(&client->dev.kobj, &adm1021_group))) |
365 | goto error1; |
366 | |
367 | data->hwmon_dev = hwmon_device_register(&client->dev); |
368 | if (IS_ERR(data->hwmon_dev)) { |
369 | err = PTR_ERR(data->hwmon_dev); |
370 | goto error3; |
371 | } |
372 | |
373 | return 0; |
374 | |
375 | error3: |
376 | sysfs_remove_group(&client->dev.kobj, &adm1021_group); |
377 | error1: |
378 | kfree(data); |
379 | error0: |
380 | return err; |
381 | } |
382 | |
383 | static void adm1021_init_client(struct i2c_client *client) |
384 | { |
385 | /* Enable ADC and disable suspend mode */ |
386 | i2c_smbus_write_byte_data(client, ADM1021_REG_CONFIG_W, |
387 | i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R) & 0xBF); |
388 | /* Set Conversion rate to 1/sec (this can be tinkered with) */ |
389 | i2c_smbus_write_byte_data(client, ADM1021_REG_CONV_RATE_W, 0x04); |
390 | } |
391 | |
392 | static int adm1021_remove(struct i2c_client *client) |
393 | { |
394 | struct adm1021_data *data = i2c_get_clientdata(client); |
395 | |
396 | hwmon_device_unregister(data->hwmon_dev); |
397 | sysfs_remove_group(&client->dev.kobj, &adm1021_group); |
398 | |
399 | kfree(data); |
400 | return 0; |
401 | } |
402 | |
403 | static struct adm1021_data *adm1021_update_device(struct device *dev) |
404 | { |
405 | struct i2c_client *client = to_i2c_client(dev); |
406 | struct adm1021_data *data = i2c_get_clientdata(client); |
407 | |
408 | mutex_lock(&data->update_lock); |
409 | |
410 | if (time_after(jiffies, data->last_updated + HZ + HZ / 2) |
411 | || !data->valid) { |
412 | int i; |
413 | |
414 | dev_dbg(&client->dev, "Starting adm1021 update\n"); |
415 | |
416 | for (i = 0; i < 2; i++) { |
417 | data->temp[i] = 1000 * |
418 | (s8) i2c_smbus_read_byte_data( |
419 | client, ADM1021_REG_TEMP(i)); |
420 | data->temp_max[i] = 1000 * |
421 | (s8) i2c_smbus_read_byte_data( |
422 | client, ADM1021_REG_TOS_R(i)); |
423 | data->temp_min[i] = 1000 * |
424 | (s8) i2c_smbus_read_byte_data( |
425 | client, ADM1021_REG_THYST_R(i)); |
426 | } |
427 | data->alarms = i2c_smbus_read_byte_data(client, |
428 | ADM1021_REG_STATUS) & 0x7c; |
429 | if (data->type == adm1023) { |
430 | /* The ADM1023 provides 3 extra bits of precision for |
431 | * the remote sensor in extra registers. */ |
432 | data->temp[1] += 125 * (i2c_smbus_read_byte_data( |
433 | client, ADM1023_REG_REM_TEMP_PREC) >> 5); |
434 | data->temp_max[1] += 125 * (i2c_smbus_read_byte_data( |
435 | client, ADM1023_REG_REM_TOS_PREC) >> 5); |
436 | data->temp_min[1] += 125 * (i2c_smbus_read_byte_data( |
437 | client, ADM1023_REG_REM_THYST_PREC) >> 5); |
438 | data->remote_temp_offset = |
439 | i2c_smbus_read_byte_data(client, |
440 | ADM1023_REG_REM_OFFSET); |
441 | data->remote_temp_offset_prec = |
442 | i2c_smbus_read_byte_data(client, |
443 | ADM1023_REG_REM_OFFSET_PREC); |
444 | } |
445 | data->last_updated = jiffies; |
446 | data->valid = 1; |
447 | } |
448 | |
449 | mutex_unlock(&data->update_lock); |
450 | |
451 | return data; |
452 | } |
453 | |
454 | static int __init sensors_adm1021_init(void) |
455 | { |
456 | return i2c_add_driver(&adm1021_driver); |
457 | } |
458 | |
459 | static void __exit sensors_adm1021_exit(void) |
460 | { |
461 | i2c_del_driver(&adm1021_driver); |
462 | } |
463 | |
464 | MODULE_AUTHOR ("Frodo Looijaard <frodol@dds.nl> and " |
465 | "Philip Edelbrock <phil@netroedge.com>"); |
466 | MODULE_DESCRIPTION("adm1021 driver"); |
467 | MODULE_LICENSE("GPL"); |
468 | |
469 | module_param(read_only, bool, 0); |
470 | MODULE_PARM_DESC(read_only, "Don't set any values, read only mode"); |
471 | |
472 | module_init(sensors_adm1021_init) |
473 | module_exit(sensors_adm1021_exit) |
474 |
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