drm/i915: Unlock mutex on i915_gem_fault() error path
[linux/fpc-iii.git] / drivers / hwmon / lm83.c
blobe59e2d1f080c9ba1ee279fb5f7cfba925672c295
1 /*
2 * lm83.c - Part of lm_sensors, Linux kernel modules for hardware
3 * monitoring
4 * Copyright (C) 2003-2008 Jean Delvare <khali@linux-fr.org>
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).
15 * 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
19 * 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.
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.
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.
34 #include <linux/module.h>
35 #include <linux/init.h>
36 #include <linux/slab.h>
37 #include <linux/jiffies.h>
38 #include <linux/i2c.h>
39 #include <linux/hwmon-sysfs.h>
40 #include <linux/hwmon.h>
41 #include <linux/err.h>
42 #include <linux/mutex.h>
43 #include <linux/sysfs.h>
46 * Addresses to scan
47 * Address is selected using 2 three-level pins, resulting in 9 possible
48 * addresses.
51 static const unsigned short normal_i2c[] = {
52 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
55 * Insmod parameters
58 I2C_CLIENT_INSMOD_2(lm83, lm82);
61 * The LM83 registers
62 * Manufacturer ID is 0x01 for National Semiconductor.
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
87 * Conversions and various macros
88 * The LM83 uses signed 8-bit values with LSB = 1 degree Celsius.
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)
97 static const u8 LM83_REG_R_TEMP[] = {
98 LM83_REG_R_LOCAL_TEMP,
99 LM83_REG_R_REMOTE1_TEMP,
100 LM83_REG_R_REMOTE2_TEMP,
101 LM83_REG_R_REMOTE3_TEMP,
102 LM83_REG_R_LOCAL_HIGH,
103 LM83_REG_R_REMOTE1_HIGH,
104 LM83_REG_R_REMOTE2_HIGH,
105 LM83_REG_R_REMOTE3_HIGH,
106 LM83_REG_R_TCRIT,
109 static const u8 LM83_REG_W_HIGH[] = {
110 LM83_REG_W_LOCAL_HIGH,
111 LM83_REG_W_REMOTE1_HIGH,
112 LM83_REG_W_REMOTE2_HIGH,
113 LM83_REG_W_REMOTE3_HIGH,
114 LM83_REG_W_TCRIT,
118 * Functions declaration
121 static int lm83_detect(struct i2c_client *new_client, int kind,
122 struct i2c_board_info *info);
123 static int lm83_probe(struct i2c_client *client,
124 const struct i2c_device_id *id);
125 static int lm83_remove(struct i2c_client *client);
126 static struct lm83_data *lm83_update_device(struct device *dev);
129 * Driver data (common to all clients)
132 static const struct i2c_device_id lm83_id[] = {
133 { "lm83", lm83 },
134 { "lm82", lm82 },
137 MODULE_DEVICE_TABLE(i2c, lm83_id);
139 static struct i2c_driver lm83_driver = {
140 .class = I2C_CLASS_HWMON,
141 .driver = {
142 .name = "lm83",
144 .probe = lm83_probe,
145 .remove = lm83_remove,
146 .id_table = lm83_id,
147 .detect = lm83_detect,
148 .address_data = &addr_data,
152 * Client data (each client gets its own)
155 struct lm83_data {
156 struct device *hwmon_dev;
157 struct mutex update_lock;
158 char valid; /* zero until following fields are valid */
159 unsigned long last_updated; /* in jiffies */
161 /* registers values */
162 s8 temp[9]; /* 0..3: input 1-4,
163 4..7: high limit 1-4,
164 8 : critical limit */
165 u16 alarms; /* bitvector, combined */
169 * Sysfs stuff
172 static ssize_t show_temp(struct device *dev, struct device_attribute *devattr,
173 char *buf)
175 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
176 struct lm83_data *data = lm83_update_device(dev);
177 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
180 static ssize_t set_temp(struct device *dev, struct device_attribute *devattr,
181 const char *buf, size_t count)
183 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
184 struct i2c_client *client = to_i2c_client(dev);
185 struct lm83_data *data = i2c_get_clientdata(client);
186 long val = simple_strtol(buf, NULL, 10);
187 int nr = attr->index;
189 mutex_lock(&data->update_lock);
190 data->temp[nr] = TEMP_TO_REG(val);
191 i2c_smbus_write_byte_data(client, LM83_REG_W_HIGH[nr - 4],
192 data->temp[nr]);
193 mutex_unlock(&data->update_lock);
194 return count;
197 static ssize_t show_alarms(struct device *dev, struct device_attribute *dummy,
198 char *buf)
200 struct lm83_data *data = lm83_update_device(dev);
201 return sprintf(buf, "%d\n", data->alarms);
204 static ssize_t show_alarm(struct device *dev, struct device_attribute
205 *devattr, char *buf)
207 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
208 struct lm83_data *data = lm83_update_device(dev);
209 int bitnr = attr->index;
211 return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
214 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
215 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
216 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
217 static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
218 static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp,
219 set_temp, 4);
220 static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp,
221 set_temp, 5);
222 static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR | S_IRUGO, show_temp,
223 set_temp, 6);
224 static SENSOR_DEVICE_ATTR(temp4_max, S_IWUSR | S_IRUGO, show_temp,
225 set_temp, 7);
226 static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp, NULL, 8);
227 static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp, NULL, 8);
228 static SENSOR_DEVICE_ATTR(temp3_crit, S_IWUSR | S_IRUGO, show_temp,
229 set_temp, 8);
230 static SENSOR_DEVICE_ATTR(temp4_crit, S_IRUGO, show_temp, NULL, 8);
232 /* Individual alarm files */
233 static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 0);
234 static SENSOR_DEVICE_ATTR(temp3_crit_alarm, S_IRUGO, show_alarm, NULL, 1);
235 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 2);
236 static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL, 4);
237 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
238 static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 8);
239 static SENSOR_DEVICE_ATTR(temp4_crit_alarm, S_IRUGO, show_alarm, NULL, 9);
240 static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_alarm, NULL, 10);
241 static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_alarm, NULL, 12);
242 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 13);
243 static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 15);
244 /* Raw alarm file for compatibility */
245 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
247 static struct attribute *lm83_attributes[] = {
248 &sensor_dev_attr_temp1_input.dev_attr.attr,
249 &sensor_dev_attr_temp3_input.dev_attr.attr,
250 &sensor_dev_attr_temp1_max.dev_attr.attr,
251 &sensor_dev_attr_temp3_max.dev_attr.attr,
252 &sensor_dev_attr_temp1_crit.dev_attr.attr,
253 &sensor_dev_attr_temp3_crit.dev_attr.attr,
255 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
256 &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
257 &sensor_dev_attr_temp3_fault.dev_attr.attr,
258 &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
259 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
260 &dev_attr_alarms.attr,
261 NULL
264 static const struct attribute_group lm83_group = {
265 .attrs = lm83_attributes,
268 static struct attribute *lm83_attributes_opt[] = {
269 &sensor_dev_attr_temp2_input.dev_attr.attr,
270 &sensor_dev_attr_temp4_input.dev_attr.attr,
271 &sensor_dev_attr_temp2_max.dev_attr.attr,
272 &sensor_dev_attr_temp4_max.dev_attr.attr,
273 &sensor_dev_attr_temp2_crit.dev_attr.attr,
274 &sensor_dev_attr_temp4_crit.dev_attr.attr,
276 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
277 &sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
278 &sensor_dev_attr_temp4_fault.dev_attr.attr,
279 &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
280 &sensor_dev_attr_temp2_fault.dev_attr.attr,
281 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
282 NULL
285 static const struct attribute_group lm83_group_opt = {
286 .attrs = lm83_attributes_opt,
290 * Real code
293 /* Return 0 if detection is successful, -ENODEV otherwise */
294 static int lm83_detect(struct i2c_client *new_client, int kind,
295 struct i2c_board_info *info)
297 struct i2c_adapter *adapter = new_client->adapter;
298 const char *name = "";
300 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
301 return -ENODEV;
303 /* Now we do the detection and identification. A negative kind
304 * means that the driver was loaded with no force parameter
305 * (default), so we must both detect and identify the chip
306 * (actually there is only one possible kind of chip for now, LM83).
307 * A zero kind means that the driver was loaded with the force
308 * parameter, the detection step shall be skipped. A positive kind
309 * means that the driver was loaded with the force parameter and a
310 * given kind of chip is requested, so both the detection and the
311 * identification steps are skipped. */
313 /* Default to an LM83 if forced */
314 if (kind == 0)
315 kind = lm83;
317 if (kind < 0) { /* detection */
318 if (((i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS1)
319 & 0xA8) != 0x00) ||
320 ((i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS2)
321 & 0x48) != 0x00) ||
322 ((i2c_smbus_read_byte_data(new_client, LM83_REG_R_CONFIG)
323 & 0x41) != 0x00)) {
324 dev_dbg(&adapter->dev,
325 "LM83 detection failed at 0x%02x.\n",
326 new_client->addr);
327 return -ENODEV;
331 if (kind <= 0) { /* identification */
332 u8 man_id, chip_id;
334 man_id = i2c_smbus_read_byte_data(new_client,
335 LM83_REG_R_MAN_ID);
336 chip_id = i2c_smbus_read_byte_data(new_client,
337 LM83_REG_R_CHIP_ID);
339 if (man_id == 0x01) { /* National Semiconductor */
340 if (chip_id == 0x03) {
341 kind = lm83;
342 } else
343 if (chip_id == 0x01) {
344 kind = lm82;
348 if (kind <= 0) { /* identification failed */
349 dev_info(&adapter->dev,
350 "Unsupported chip (man_id=0x%02X, "
351 "chip_id=0x%02X).\n", man_id, chip_id);
352 return -ENODEV;
356 if (kind == lm83) {
357 name = "lm83";
358 } else
359 if (kind == lm82) {
360 name = "lm82";
363 strlcpy(info->type, name, I2C_NAME_SIZE);
365 return 0;
368 static int lm83_probe(struct i2c_client *new_client,
369 const struct i2c_device_id *id)
371 struct lm83_data *data;
372 int err;
374 data = kzalloc(sizeof(struct lm83_data), GFP_KERNEL);
375 if (!data) {
376 err = -ENOMEM;
377 goto exit;
380 i2c_set_clientdata(new_client, data);
381 data->valid = 0;
382 mutex_init(&data->update_lock);
385 * Register sysfs hooks
386 * 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.
391 if ((err = sysfs_create_group(&new_client->dev.kobj, &lm83_group)))
392 goto exit_free;
394 if (id->driver_data == lm83) {
395 if ((err = sysfs_create_group(&new_client->dev.kobj,
396 &lm83_group_opt)))
397 goto exit_remove_files;
400 data->hwmon_dev = hwmon_device_register(&new_client->dev);
401 if (IS_ERR(data->hwmon_dev)) {
402 err = PTR_ERR(data->hwmon_dev);
403 goto exit_remove_files;
406 return 0;
408 exit_remove_files:
409 sysfs_remove_group(&new_client->dev.kobj, &lm83_group);
410 sysfs_remove_group(&new_client->dev.kobj, &lm83_group_opt);
411 exit_free:
412 kfree(data);
413 exit:
414 return err;
417 static int lm83_remove(struct i2c_client *client)
419 struct lm83_data *data = i2c_get_clientdata(client);
421 hwmon_device_unregister(data->hwmon_dev);
422 sysfs_remove_group(&client->dev.kobj, &lm83_group);
423 sysfs_remove_group(&client->dev.kobj, &lm83_group_opt);
425 kfree(data);
426 return 0;
429 static struct lm83_data *lm83_update_device(struct device *dev)
431 struct i2c_client *client = to_i2c_client(dev);
432 struct lm83_data *data = i2c_get_clientdata(client);
434 mutex_lock(&data->update_lock);
436 if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
437 int nr;
439 dev_dbg(&client->dev, "Updating lm83 data.\n");
440 for (nr = 0; nr < 9; nr++) {
441 data->temp[nr] =
442 i2c_smbus_read_byte_data(client,
443 LM83_REG_R_TEMP[nr]);
445 data->alarms =
446 i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS1)
447 + (i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS2)
448 << 8);
450 data->last_updated = jiffies;
451 data->valid = 1;
454 mutex_unlock(&data->update_lock);
456 return data;
459 static int __init sensors_lm83_init(void)
461 return i2c_add_driver(&lm83_driver);
464 static void __exit sensors_lm83_exit(void)
466 i2c_del_driver(&lm83_driver);
469 MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
470 MODULE_DESCRIPTION("LM83 driver");
471 MODULE_LICENSE("GPL");
473 module_init(sensors_lm83_init);
474 module_exit(sensors_lm83_exit);