blob: 6a8642fa25fbd3850b287c712544a524397b83d8 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * lm83.c - Part of lm_sensors, Linux kernel modules for hardware
3 * monitoring
Jean Delvare2d457712006-09-24 20:52:15 +02004 * Copyright (C) 2003-2006 Jean Delvare <khali@linux-fr.org>
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 *
6 * Heavily inspired from the lm78, lm75 and adm1021 drivers. The LM83 is
7 * a sensor chip made by National Semiconductor. It reports up to four
8 * temperatures (its own plus up to three external ones) with a 1 deg
9 * resolution and a 3-4 deg accuracy. Complete datasheet can be obtained
10 * from National's website at:
11 * http://www.national.com/pf/LM/LM83.html
12 * Since the datasheet omits to give the chip stepping code, I give it
13 * here: 0x03 (at register 0xff).
14 *
Jordan Crouse43cb7eb2006-03-23 16:19:49 +010015 * Also supports the LM82 temp sensor, which is basically a stripped down
16 * model of the LM83. Datasheet is here:
17 * http://www.national.com/pf/LM/LM82.html
18 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070019 * This program is free software; you can redistribute it and/or modify
20 * it under the terms of the GNU General Public License as published by
21 * the Free Software Foundation; either version 2 of the License, or
22 * (at your option) any later version.
23 *
24 * This program is distributed in the hope that it will be useful,
25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27 * GNU General Public License for more details.
28 *
29 * You should have received a copy of the GNU General Public License
30 * along with this program; if not, write to the Free Software
31 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
32 */
33
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <linux/module.h>
35#include <linux/init.h>
36#include <linux/slab.h>
37#include <linux/jiffies.h>
38#include <linux/i2c.h>
Jean Delvare10c08f82005-06-06 19:34:45 +020039#include <linux/hwmon-sysfs.h>
Mark M. Hoffman943b0832005-07-15 21:39:18 -040040#include <linux/hwmon.h>
41#include <linux/err.h>
Ingo Molnar9a61bf62006-01-18 23:19:26 +010042#include <linux/mutex.h>
Jean Delvare0e39e012006-09-24 21:16:40 +020043#include <linux/sysfs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070044
45/*
46 * Addresses to scan
47 * Address is selected using 2 three-level pins, resulting in 9 possible
48 * addresses.
49 */
50
Mark M. Hoffman25e9c862008-02-17 22:28:03 -050051static const unsigned short normal_i2c[] = {
52 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
54/*
55 * Insmod parameters
56 */
57
Jordan Crouse43cb7eb2006-03-23 16:19:49 +010058I2C_CLIENT_INSMOD_2(lm83, lm82);
Linus Torvalds1da177e2005-04-16 15:20:36 -070059
60/*
61 * The LM83 registers
62 * Manufacturer ID is 0x01 for National Semiconductor.
63 */
64
65#define LM83_REG_R_MAN_ID 0xFE
66#define LM83_REG_R_CHIP_ID 0xFF
67#define LM83_REG_R_CONFIG 0x03
68#define LM83_REG_W_CONFIG 0x09
69#define LM83_REG_R_STATUS1 0x02
70#define LM83_REG_R_STATUS2 0x35
71#define LM83_REG_R_LOCAL_TEMP 0x00
72#define LM83_REG_R_LOCAL_HIGH 0x05
73#define LM83_REG_W_LOCAL_HIGH 0x0B
74#define LM83_REG_R_REMOTE1_TEMP 0x30
75#define LM83_REG_R_REMOTE1_HIGH 0x38
76#define LM83_REG_W_REMOTE1_HIGH 0x50
77#define LM83_REG_R_REMOTE2_TEMP 0x01
78#define LM83_REG_R_REMOTE2_HIGH 0x07
79#define LM83_REG_W_REMOTE2_HIGH 0x0D
80#define LM83_REG_R_REMOTE3_TEMP 0x31
81#define LM83_REG_R_REMOTE3_HIGH 0x3A
82#define LM83_REG_W_REMOTE3_HIGH 0x52
83#define LM83_REG_R_TCRIT 0x42
84#define LM83_REG_W_TCRIT 0x5A
85
86/*
87 * Conversions and various macros
Steven Cole44bbe872005-05-03 18:21:25 -060088 * The LM83 uses signed 8-bit values with LSB = 1 degree Celsius.
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 */
90
91#define TEMP_FROM_REG(val) ((val) * 1000)
92#define TEMP_TO_REG(val) ((val) <= -128000 ? -128 : \
93 (val) >= 127000 ? 127 : \
94 (val) < 0 ? ((val) - 500) / 1000 : \
95 ((val) + 500) / 1000)
96
97static const u8 LM83_REG_R_TEMP[] = {
98 LM83_REG_R_LOCAL_TEMP,
99 LM83_REG_R_REMOTE1_TEMP,
100 LM83_REG_R_REMOTE2_TEMP,
Jean Delvare1a86c052005-06-05 21:16:39 +0200101 LM83_REG_R_REMOTE3_TEMP,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 LM83_REG_R_LOCAL_HIGH,
103 LM83_REG_R_REMOTE1_HIGH,
104 LM83_REG_R_REMOTE2_HIGH,
Jean Delvare1a86c052005-06-05 21:16:39 +0200105 LM83_REG_R_REMOTE3_HIGH,
106 LM83_REG_R_TCRIT,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107};
108
109static const u8 LM83_REG_W_HIGH[] = {
110 LM83_REG_W_LOCAL_HIGH,
111 LM83_REG_W_REMOTE1_HIGH,
112 LM83_REG_W_REMOTE2_HIGH,
Jean Delvare1a86c052005-06-05 21:16:39 +0200113 LM83_REG_W_REMOTE3_HIGH,
114 LM83_REG_W_TCRIT,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115};
116
117/*
118 * Functions declaration
119 */
120
121static int lm83_attach_adapter(struct i2c_adapter *adapter);
122static int lm83_detect(struct i2c_adapter *adapter, int address, int kind);
123static int lm83_detach_client(struct i2c_client *client);
124static struct lm83_data *lm83_update_device(struct device *dev);
125
126/*
127 * Driver data (common to all clients)
128 */
129
130static struct i2c_driver lm83_driver = {
Laurent Riffardcdaf7932005-11-26 20:37:41 +0100131 .driver = {
Laurent Riffardcdaf7932005-11-26 20:37:41 +0100132 .name = "lm83",
133 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 .attach_adapter = lm83_attach_adapter,
135 .detach_client = lm83_detach_client,
136};
137
138/*
139 * Client data (each client gets its own)
140 */
141
142struct lm83_data {
143 struct i2c_client client;
Tony Jones1beeffe2007-08-20 13:46:20 -0700144 struct device *hwmon_dev;
Ingo Molnar9a61bf62006-01-18 23:19:26 +0100145 struct mutex update_lock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 char valid; /* zero until following fields are valid */
147 unsigned long last_updated; /* in jiffies */
148
149 /* registers values */
Jean Delvare1a86c052005-06-05 21:16:39 +0200150 s8 temp[9]; /* 0..3: input 1-4,
151 4..7: high limit 1-4,
152 8 : critical limit */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 u16 alarms; /* bitvector, combined */
154};
155
156/*
157 * Sysfs stuff
158 */
159
Jean Delvare1a86c052005-06-05 21:16:39 +0200160static ssize_t show_temp(struct device *dev, struct device_attribute *devattr,
161 char *buf)
162{
163 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
164 struct lm83_data *data = lm83_update_device(dev);
165 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167
Jean Delvare1a86c052005-06-05 21:16:39 +0200168static ssize_t set_temp(struct device *dev, struct device_attribute *devattr,
169 const char *buf, size_t count)
170{
171 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
172 struct i2c_client *client = to_i2c_client(dev);
173 struct lm83_data *data = i2c_get_clientdata(client);
174 long val = simple_strtol(buf, NULL, 10);
175 int nr = attr->index;
176
Ingo Molnar9a61bf62006-01-18 23:19:26 +0100177 mutex_lock(&data->update_lock);
Jean Delvare1a86c052005-06-05 21:16:39 +0200178 data->temp[nr] = TEMP_TO_REG(val);
179 i2c_smbus_write_byte_data(client, LM83_REG_W_HIGH[nr - 4],
180 data->temp[nr]);
Ingo Molnar9a61bf62006-01-18 23:19:26 +0100181 mutex_unlock(&data->update_lock);
Jean Delvare1a86c052005-06-05 21:16:39 +0200182 return count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184
Jean Delvare1a86c052005-06-05 21:16:39 +0200185static ssize_t show_alarms(struct device *dev, struct device_attribute *dummy,
186 char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187{
188 struct lm83_data *data = lm83_update_device(dev);
189 return sprintf(buf, "%d\n", data->alarms);
190}
191
Jean Delvare2d457712006-09-24 20:52:15 +0200192static ssize_t show_alarm(struct device *dev, struct device_attribute
193 *devattr, char *buf)
194{
195 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
196 struct lm83_data *data = lm83_update_device(dev);
197 int bitnr = attr->index;
198
199 return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
200}
201
Jean Delvare1a86c052005-06-05 21:16:39 +0200202static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
203static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
204static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
205static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
206static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp,
207 set_temp, 4);
208static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp,
209 set_temp, 5);
210static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR | S_IRUGO, show_temp,
211 set_temp, 6);
212static SENSOR_DEVICE_ATTR(temp4_max, S_IWUSR | S_IRUGO, show_temp,
213 set_temp, 7);
214static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp, NULL, 8);
215static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp, NULL, 8);
216static SENSOR_DEVICE_ATTR(temp3_crit, S_IWUSR | S_IRUGO, show_temp,
217 set_temp, 8);
218static SENSOR_DEVICE_ATTR(temp4_crit, S_IRUGO, show_temp, NULL, 8);
Jean Delvare2d457712006-09-24 20:52:15 +0200219
220/* Individual alarm files */
221static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 0);
222static SENSOR_DEVICE_ATTR(temp3_crit_alarm, S_IRUGO, show_alarm, NULL, 1);
Jean Delvare7817a392007-06-09 10:11:16 -0400223static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 2);
Jean Delvare2d457712006-09-24 20:52:15 +0200224static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL, 4);
225static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
226static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 8);
227static SENSOR_DEVICE_ATTR(temp4_crit_alarm, S_IRUGO, show_alarm, NULL, 9);
Jean Delvare7817a392007-06-09 10:11:16 -0400228static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_alarm, NULL, 10);
Jean Delvare2d457712006-09-24 20:52:15 +0200229static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_alarm, NULL, 12);
Jean Delvare7817a392007-06-09 10:11:16 -0400230static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 13);
Jean Delvare2d457712006-09-24 20:52:15 +0200231static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 15);
232/* Raw alarm file for compatibility */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
234
Jean Delvare0e39e012006-09-24 21:16:40 +0200235static struct attribute *lm83_attributes[] = {
236 &sensor_dev_attr_temp1_input.dev_attr.attr,
237 &sensor_dev_attr_temp3_input.dev_attr.attr,
238 &sensor_dev_attr_temp1_max.dev_attr.attr,
239 &sensor_dev_attr_temp3_max.dev_attr.attr,
240 &sensor_dev_attr_temp1_crit.dev_attr.attr,
241 &sensor_dev_attr_temp3_crit.dev_attr.attr,
242
243 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
244 &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
Jean Delvare7817a392007-06-09 10:11:16 -0400245 &sensor_dev_attr_temp3_fault.dev_attr.attr,
Jean Delvare0e39e012006-09-24 21:16:40 +0200246 &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
247 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
248 &dev_attr_alarms.attr,
249 NULL
250};
251
252static const struct attribute_group lm83_group = {
253 .attrs = lm83_attributes,
254};
255
256static struct attribute *lm83_attributes_opt[] = {
257 &sensor_dev_attr_temp2_input.dev_attr.attr,
258 &sensor_dev_attr_temp4_input.dev_attr.attr,
259 &sensor_dev_attr_temp2_max.dev_attr.attr,
260 &sensor_dev_attr_temp4_max.dev_attr.attr,
261 &sensor_dev_attr_temp2_crit.dev_attr.attr,
262 &sensor_dev_attr_temp4_crit.dev_attr.attr,
263
264 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
265 &sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
Jean Delvare7817a392007-06-09 10:11:16 -0400266 &sensor_dev_attr_temp4_fault.dev_attr.attr,
Jean Delvare0e39e012006-09-24 21:16:40 +0200267 &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
Jean Delvare7817a392007-06-09 10:11:16 -0400268 &sensor_dev_attr_temp2_fault.dev_attr.attr,
Jean Delvare0e39e012006-09-24 21:16:40 +0200269 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
270 NULL
271};
272
273static const struct attribute_group lm83_group_opt = {
274 .attrs = lm83_attributes_opt,
275};
276
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277/*
278 * Real code
279 */
280
281static int lm83_attach_adapter(struct i2c_adapter *adapter)
282{
283 if (!(adapter->class & I2C_CLASS_HWMON))
284 return 0;
Jean Delvare2ed2dc32005-07-31 21:42:02 +0200285 return i2c_probe(adapter, &addr_data, lm83_detect);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286}
287
288/*
289 * The following function does more than just detection. If detection
290 * succeeds, it also registers the new chip.
291 */
292static int lm83_detect(struct i2c_adapter *adapter, int address, int kind)
293{
294 struct i2c_client *new_client;
295 struct lm83_data *data;
296 int err = 0;
297 const char *name = "";
298
299 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
300 goto exit;
301
Deepak Saxenaba9c2e82005-10-17 23:08:32 +0200302 if (!(data = kzalloc(sizeof(struct lm83_data), GFP_KERNEL))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 err = -ENOMEM;
304 goto exit;
305 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306
307 /* The common I2C client data is placed right after the
308 * LM83-specific data. */
309 new_client = &data->client;
310 i2c_set_clientdata(new_client, data);
311 new_client->addr = address;
312 new_client->adapter = adapter;
313 new_client->driver = &lm83_driver;
314 new_client->flags = 0;
315
316 /* Now we do the detection and identification. A negative kind
317 * means that the driver was loaded with no force parameter
318 * (default), so we must both detect and identify the chip
319 * (actually there is only one possible kind of chip for now, LM83).
320 * A zero kind means that the driver was loaded with the force
321 * parameter, the detection step shall be skipped. A positive kind
322 * means that the driver was loaded with the force parameter and a
323 * given kind of chip is requested, so both the detection and the
324 * identification steps are skipped. */
325
326 /* Default to an LM83 if forced */
327 if (kind == 0)
328 kind = lm83;
329
330 if (kind < 0) { /* detection */
331 if (((i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS1)
332 & 0xA8) != 0x00) ||
333 ((i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS2)
334 & 0x48) != 0x00) ||
335 ((i2c_smbus_read_byte_data(new_client, LM83_REG_R_CONFIG)
336 & 0x41) != 0x00)) {
337 dev_dbg(&adapter->dev,
338 "LM83 detection failed at 0x%02x.\n", address);
339 goto exit_free;
340 }
341 }
342
343 if (kind <= 0) { /* identification */
344 u8 man_id, chip_id;
345
346 man_id = i2c_smbus_read_byte_data(new_client,
347 LM83_REG_R_MAN_ID);
348 chip_id = i2c_smbus_read_byte_data(new_client,
349 LM83_REG_R_CHIP_ID);
350
351 if (man_id == 0x01) { /* National Semiconductor */
352 if (chip_id == 0x03) {
353 kind = lm83;
Jordan Crouse43cb7eb2006-03-23 16:19:49 +0100354 } else
355 if (chip_id == 0x01) {
356 kind = lm82;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 }
358 }
359
360 if (kind <= 0) { /* identification failed */
361 dev_info(&adapter->dev,
362 "Unsupported chip (man_id=0x%02X, "
363 "chip_id=0x%02X).\n", man_id, chip_id);
364 goto exit_free;
365 }
366 }
367
368 if (kind == lm83) {
369 name = "lm83";
Jordan Crouse43cb7eb2006-03-23 16:19:49 +0100370 } else
371 if (kind == lm82) {
372 name = "lm82";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 }
374
375 /* We can fill in the remaining client fields */
376 strlcpy(new_client->name, name, I2C_NAME_SIZE);
377 data->valid = 0;
Ingo Molnar9a61bf62006-01-18 23:19:26 +0100378 mutex_init(&data->update_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379
380 /* Tell the I2C layer a new client has arrived */
381 if ((err = i2c_attach_client(new_client)))
382 goto exit_free;
383
384 /*
Jean Delvare0e39e012006-09-24 21:16:40 +0200385 * Register sysfs hooks
Jordan Crouse43cb7eb2006-03-23 16:19:49 +0100386 * The LM82 can only monitor one external diode which is
387 * at the same register as the LM83 temp3 entry - so we
388 * declare 1 and 3 common, and then 2 and 4 only for the LM83.
389 */
390
Jean Delvare0e39e012006-09-24 21:16:40 +0200391 if ((err = sysfs_create_group(&new_client->dev.kobj, &lm83_group)))
392 goto exit_detach;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393
Jordan Crouse43cb7eb2006-03-23 16:19:49 +0100394 if (kind == lm83) {
Jean Delvare0e39e012006-09-24 21:16:40 +0200395 if ((err = sysfs_create_group(&new_client->dev.kobj,
396 &lm83_group_opt)))
397 goto exit_remove_files;
398 }
Jordan Crouse43cb7eb2006-03-23 16:19:49 +0100399
Tony Jones1beeffe2007-08-20 13:46:20 -0700400 data->hwmon_dev = hwmon_device_register(&new_client->dev);
401 if (IS_ERR(data->hwmon_dev)) {
402 err = PTR_ERR(data->hwmon_dev);
Jean Delvare0e39e012006-09-24 21:16:40 +0200403 goto exit_remove_files;
Jordan Crouse43cb7eb2006-03-23 16:19:49 +0100404 }
405
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 return 0;
407
Jean Delvare0e39e012006-09-24 21:16:40 +0200408exit_remove_files:
409 sysfs_remove_group(&new_client->dev.kobj, &lm83_group);
410 sysfs_remove_group(&new_client->dev.kobj, &lm83_group_opt);
Mark M. Hoffman943b0832005-07-15 21:39:18 -0400411exit_detach:
412 i2c_detach_client(new_client);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413exit_free:
414 kfree(data);
415exit:
416 return err;
417}
418
419static int lm83_detach_client(struct i2c_client *client)
420{
Mark M. Hoffman943b0832005-07-15 21:39:18 -0400421 struct lm83_data *data = i2c_get_clientdata(client);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 int err;
423
Tony Jones1beeffe2007-08-20 13:46:20 -0700424 hwmon_device_unregister(data->hwmon_dev);
Jean Delvare0e39e012006-09-24 21:16:40 +0200425 sysfs_remove_group(&client->dev.kobj, &lm83_group);
426 sysfs_remove_group(&client->dev.kobj, &lm83_group_opt);
Mark M. Hoffman943b0832005-07-15 21:39:18 -0400427
Jean Delvare7bef5592005-07-27 22:14:49 +0200428 if ((err = i2c_detach_client(client)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430
Mark M. Hoffman943b0832005-07-15 21:39:18 -0400431 kfree(data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 return 0;
433}
434
435static struct lm83_data *lm83_update_device(struct device *dev)
436{
437 struct i2c_client *client = to_i2c_client(dev);
438 struct lm83_data *data = i2c_get_clientdata(client);
439
Ingo Molnar9a61bf62006-01-18 23:19:26 +0100440 mutex_lock(&data->update_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441
442 if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
443 int nr;
444
445 dev_dbg(&client->dev, "Updating lm83 data.\n");
Jean Delvare1a86c052005-06-05 21:16:39 +0200446 for (nr = 0; nr < 9; nr++) {
447 data->temp[nr] =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 i2c_smbus_read_byte_data(client,
449 LM83_REG_R_TEMP[nr]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 data->alarms =
452 i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS1)
453 + (i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS2)
454 << 8);
455
456 data->last_updated = jiffies;
457 data->valid = 1;
458 }
459
Ingo Molnar9a61bf62006-01-18 23:19:26 +0100460 mutex_unlock(&data->update_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461
462 return data;
463}
464
465static int __init sensors_lm83_init(void)
466{
467 return i2c_add_driver(&lm83_driver);
468}
469
470static void __exit sensors_lm83_exit(void)
471{
472 i2c_del_driver(&lm83_driver);
473}
474
475MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
476MODULE_DESCRIPTION("LM83 driver");
477MODULE_LICENSE("GPL");
478
479module_init(sensors_lm83_init);
480module_exit(sensors_lm83_exit);