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1/*
2 * lm83.c - Part of lm_sensors, Linux kernel modules for hardware
3 * monitoring
4 * Copyright (C) 2003-2009 Jean Delvare <jdelvare@suse.de>
5 *
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 *
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
18 *
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.
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
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>
44
45/*
46 * Addresses to scan
47 * Address is selected using 2 three-level pins, resulting in 9 possible
48 * addresses.
49 */
50
51static const unsigned short normal_i2c[] = {
52 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
53
54enum chips { lm83, lm82 };
55
56/*
57 * The LM83 registers
58 * Manufacturer ID is 0x01 for National Semiconductor.
59 */
60
61#define LM83_REG_R_MAN_ID 0xFE
62#define LM83_REG_R_CHIP_ID 0xFF
63#define LM83_REG_R_CONFIG 0x03
64#define LM83_REG_W_CONFIG 0x09
65#define LM83_REG_R_STATUS1 0x02
66#define LM83_REG_R_STATUS2 0x35
67#define LM83_REG_R_LOCAL_TEMP 0x00
68#define LM83_REG_R_LOCAL_HIGH 0x05
69#define LM83_REG_W_LOCAL_HIGH 0x0B
70#define LM83_REG_R_REMOTE1_TEMP 0x30
71#define LM83_REG_R_REMOTE1_HIGH 0x38
72#define LM83_REG_W_REMOTE1_HIGH 0x50
73#define LM83_REG_R_REMOTE2_TEMP 0x01
74#define LM83_REG_R_REMOTE2_HIGH 0x07
75#define LM83_REG_W_REMOTE2_HIGH 0x0D
76#define LM83_REG_R_REMOTE3_TEMP 0x31
77#define LM83_REG_R_REMOTE3_HIGH 0x3A
78#define LM83_REG_W_REMOTE3_HIGH 0x52
79#define LM83_REG_R_TCRIT 0x42
80#define LM83_REG_W_TCRIT 0x5A
81
82/*
83 * Conversions and various macros
84 * The LM83 uses signed 8-bit values with LSB = 1 degree Celsius.
85 */
86
87#define TEMP_FROM_REG(val) ((val) * 1000)
88#define TEMP_TO_REG(val) ((val) <= -128000 ? -128 : \
89 (val) >= 127000 ? 127 : \
90 (val) < 0 ? ((val) - 500) / 1000 : \
91 ((val) + 500) / 1000)
92
93static const u8 LM83_REG_R_TEMP[] = {
94 LM83_REG_R_LOCAL_TEMP,
95 LM83_REG_R_REMOTE1_TEMP,
96 LM83_REG_R_REMOTE2_TEMP,
97 LM83_REG_R_REMOTE3_TEMP,
98 LM83_REG_R_LOCAL_HIGH,
99 LM83_REG_R_REMOTE1_HIGH,
100 LM83_REG_R_REMOTE2_HIGH,
101 LM83_REG_R_REMOTE3_HIGH,
102 LM83_REG_R_TCRIT,
103};
104
105static const u8 LM83_REG_W_HIGH[] = {
106 LM83_REG_W_LOCAL_HIGH,
107 LM83_REG_W_REMOTE1_HIGH,
108 LM83_REG_W_REMOTE2_HIGH,
109 LM83_REG_W_REMOTE3_HIGH,
110 LM83_REG_W_TCRIT,
111};
112
113/*
114 * Functions declaration
115 */
116
117static int lm83_detect(struct i2c_client *new_client,
118 struct i2c_board_info *info);
119static int lm83_probe(struct i2c_client *client,
120 const struct i2c_device_id *id);
121static int lm83_remove(struct i2c_client *client);
122static struct lm83_data *lm83_update_device(struct device *dev);
123
124/*
125 * Driver data (common to all clients)
126 */
127
128static const struct i2c_device_id lm83_id[] = {
129 { "lm83", lm83 },
130 { "lm82", lm82 },
131 { }
132};
133MODULE_DEVICE_TABLE(i2c, lm83_id);
134
135static struct i2c_driver lm83_driver = {
136 .class = I2C_CLASS_HWMON,
137 .driver = {
138 .name = "lm83",
139 },
140 .probe = lm83_probe,
141 .remove = lm83_remove,
142 .id_table = lm83_id,
143 .detect = lm83_detect,
144 .address_list = normal_i2c,
145};
146
147/*
148 * Client data (each client gets its own)
149 */
150
151struct lm83_data {
152 struct device *hwmon_dev;
153 struct mutex update_lock;
154 char valid; /* zero until following fields are valid */
155 unsigned long last_updated; /* in jiffies */
156
157 /* registers values */
158 s8 temp[9]; /* 0..3: input 1-4,
159 4..7: high limit 1-4,
160 8 : critical limit */
161 u16 alarms; /* bitvector, combined */
162};
163
164/*
165 * Sysfs stuff
166 */
167
168static ssize_t show_temp(struct device *dev, struct device_attribute *devattr,
169 char *buf)
170{
171 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
172 struct lm83_data *data = lm83_update_device(dev);
173 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
174}
175
176static ssize_t set_temp(struct device *dev, struct device_attribute *devattr,
177 const char *buf, size_t count)
178{
179 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
180 struct i2c_client *client = to_i2c_client(dev);
181 struct lm83_data *data = i2c_get_clientdata(client);
182 long val;
183 int nr = attr->index;
184 int err;
185
186 err = kstrtol(buf, 10, &val);
187 if (err < 0)
188 return err;
189
190 mutex_lock(&data->update_lock);
191 data->temp[nr] = TEMP_TO_REG(val);
192 i2c_smbus_write_byte_data(client, LM83_REG_W_HIGH[nr - 4],
193 data->temp[nr]);
194 mutex_unlock(&data->update_lock);
195 return count;
196}
197
198static ssize_t show_alarms(struct device *dev, struct device_attribute *dummy,
199 char *buf)
200{
201 struct lm83_data *data = lm83_update_device(dev);
202 return sprintf(buf, "%d\n", data->alarms);
203}
204
205static ssize_t show_alarm(struct device *dev, struct device_attribute
206 *devattr, char *buf)
207{
208 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
209 struct lm83_data *data = lm83_update_device(dev);
210 int bitnr = attr->index;
211
212 return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
213}
214
215static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
216static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
217static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
218static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
219static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp,
220 set_temp, 4);
221static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp,
222 set_temp, 5);
223static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR | S_IRUGO, show_temp,
224 set_temp, 6);
225static SENSOR_DEVICE_ATTR(temp4_max, S_IWUSR | S_IRUGO, show_temp,
226 set_temp, 7);
227static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp, NULL, 8);
228static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp, NULL, 8);
229static SENSOR_DEVICE_ATTR(temp3_crit, S_IWUSR | S_IRUGO, show_temp,
230 set_temp, 8);
231static SENSOR_DEVICE_ATTR(temp4_crit, S_IRUGO, show_temp, NULL, 8);
232
233/* Individual alarm files */
234static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 0);
235static SENSOR_DEVICE_ATTR(temp3_crit_alarm, S_IRUGO, show_alarm, NULL, 1);
236static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 2);
237static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL, 4);
238static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
239static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 8);
240static SENSOR_DEVICE_ATTR(temp4_crit_alarm, S_IRUGO, show_alarm, NULL, 9);
241static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_alarm, NULL, 10);
242static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_alarm, NULL, 12);
243static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 13);
244static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 15);
245/* Raw alarm file for compatibility */
246static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
247
248static struct attribute *lm83_attributes[] = {
249 &sensor_dev_attr_temp1_input.dev_attr.attr,
250 &sensor_dev_attr_temp3_input.dev_attr.attr,
251 &sensor_dev_attr_temp1_max.dev_attr.attr,
252 &sensor_dev_attr_temp3_max.dev_attr.attr,
253 &sensor_dev_attr_temp1_crit.dev_attr.attr,
254 &sensor_dev_attr_temp3_crit.dev_attr.attr,
255
256 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
257 &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
258 &sensor_dev_attr_temp3_fault.dev_attr.attr,
259 &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
260 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
261 &dev_attr_alarms.attr,
262 NULL
263};
264
265static const struct attribute_group lm83_group = {
266 .attrs = lm83_attributes,
267};
268
269static struct attribute *lm83_attributes_opt[] = {
270 &sensor_dev_attr_temp2_input.dev_attr.attr,
271 &sensor_dev_attr_temp4_input.dev_attr.attr,
272 &sensor_dev_attr_temp2_max.dev_attr.attr,
273 &sensor_dev_attr_temp4_max.dev_attr.attr,
274 &sensor_dev_attr_temp2_crit.dev_attr.attr,
275 &sensor_dev_attr_temp4_crit.dev_attr.attr,
276
277 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
278 &sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
279 &sensor_dev_attr_temp4_fault.dev_attr.attr,
280 &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
281 &sensor_dev_attr_temp2_fault.dev_attr.attr,
282 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
283 NULL
284};
285
286static const struct attribute_group lm83_group_opt = {
287 .attrs = lm83_attributes_opt,
288};
289
290/*
291 * Real code
292 */
293
294/* Return 0 if detection is successful, -ENODEV otherwise */
295static int lm83_detect(struct i2c_client *new_client,
296 struct i2c_board_info *info)
297{
298 struct i2c_adapter *adapter = new_client->adapter;
299 const char *name;
300 u8 man_id, chip_id;
301
302 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
303 return -ENODEV;
304
305 /* Detection */
306 if ((i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS1) & 0xA8) ||
307 (i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS2) & 0x48) ||
308 (i2c_smbus_read_byte_data(new_client, LM83_REG_R_CONFIG) & 0x41)) {
309 dev_dbg(&adapter->dev, "LM83 detection failed at 0x%02x\n",
310 new_client->addr);
311 return -ENODEV;
312 }
313
314 /* Identification */
315 man_id = i2c_smbus_read_byte_data(new_client, LM83_REG_R_MAN_ID);
316 if (man_id != 0x01) /* National Semiconductor */
317 return -ENODEV;
318
319 chip_id = i2c_smbus_read_byte_data(new_client, LM83_REG_R_CHIP_ID);
320 switch (chip_id) {
321 case 0x03:
322 name = "lm83";
323 break;
324 case 0x01:
325 name = "lm82";
326 break;
327 default:
328 /* identification failed */
329 dev_info(&adapter->dev,
330 "Unsupported chip (man_id=0x%02X, chip_id=0x%02X)\n",
331 man_id, chip_id);
332 return -ENODEV;
333 }
334
335 strlcpy(info->type, name, I2C_NAME_SIZE);
336
337 return 0;
338}
339
340static int lm83_probe(struct i2c_client *new_client,
341 const struct i2c_device_id *id)
342{
343 struct lm83_data *data;
344 int err;
345
346 data = devm_kzalloc(&new_client->dev, sizeof(struct lm83_data),
347 GFP_KERNEL);
348 if (!data)
349 return -ENOMEM;
350
351 i2c_set_clientdata(new_client, data);
352 mutex_init(&data->update_lock);
353
354 /*
355 * Register sysfs hooks
356 * The LM82 can only monitor one external diode which is
357 * at the same register as the LM83 temp3 entry - so we
358 * declare 1 and 3 common, and then 2 and 4 only for the LM83.
359 */
360
361 err = sysfs_create_group(&new_client->dev.kobj, &lm83_group);
362 if (err)
363 return err;
364
365 if (id->driver_data == lm83) {
366 err = sysfs_create_group(&new_client->dev.kobj,
367 &lm83_group_opt);
368 if (err)
369 goto exit_remove_files;
370 }
371
372 data->hwmon_dev = hwmon_device_register(&new_client->dev);
373 if (IS_ERR(data->hwmon_dev)) {
374 err = PTR_ERR(data->hwmon_dev);
375 goto exit_remove_files;
376 }
377
378 return 0;
379
380exit_remove_files:
381 sysfs_remove_group(&new_client->dev.kobj, &lm83_group);
382 sysfs_remove_group(&new_client->dev.kobj, &lm83_group_opt);
383 return err;
384}
385
386static int lm83_remove(struct i2c_client *client)
387{
388 struct lm83_data *data = i2c_get_clientdata(client);
389
390 hwmon_device_unregister(data->hwmon_dev);
391 sysfs_remove_group(&client->dev.kobj, &lm83_group);
392 sysfs_remove_group(&client->dev.kobj, &lm83_group_opt);
393
394 return 0;
395}
396
397static struct lm83_data *lm83_update_device(struct device *dev)
398{
399 struct i2c_client *client = to_i2c_client(dev);
400 struct lm83_data *data = i2c_get_clientdata(client);
401
402 mutex_lock(&data->update_lock);
403
404 if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
405 int nr;
406
407 dev_dbg(&client->dev, "Updating lm83 data.\n");
408 for (nr = 0; nr < 9; nr++) {
409 data->temp[nr] =
410 i2c_smbus_read_byte_data(client,
411 LM83_REG_R_TEMP[nr]);
412 }
413 data->alarms =
414 i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS1)
415 + (i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS2)
416 << 8);
417
418 data->last_updated = jiffies;
419 data->valid = 1;
420 }
421
422 mutex_unlock(&data->update_lock);
423
424 return data;
425}
426
427module_i2c_driver(lm83_driver);
428
429MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
430MODULE_DESCRIPTION("LM83 driver");
431MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * lm83.c - Part of lm_sensors, Linux kernel modules for hardware
4 * monitoring
5 * Copyright (C) 2003-2009 Jean Delvare <jdelvare@suse.de>
6 *
7 * Heavily inspired from the lm78, lm75 and adm1021 drivers. The LM83 is
8 * a sensor chip made by National Semiconductor. It reports up to four
9 * temperatures (its own plus up to three external ones) with a 1 deg
10 * resolution and a 3-4 deg accuracy. Complete datasheet can be obtained
11 * from National's website at:
12 * http://www.national.com/pf/LM/LM83.html
13 * Since the datasheet omits to give the chip stepping code, I give it
14 * here: 0x03 (at register 0xff).
15 *
16 * Also supports the LM82 temp sensor, which is basically a stripped down
17 * model of the LM83. Datasheet is here:
18 * http://www.national.com/pf/LM/LM82.html
19 */
20
21#include <linux/module.h>
22#include <linux/init.h>
23#include <linux/slab.h>
24#include <linux/jiffies.h>
25#include <linux/i2c.h>
26#include <linux/hwmon-sysfs.h>
27#include <linux/hwmon.h>
28#include <linux/err.h>
29#include <linux/mutex.h>
30#include <linux/sysfs.h>
31
32/*
33 * Addresses to scan
34 * Address is selected using 2 three-level pins, resulting in 9 possible
35 * addresses.
36 */
37
38static const unsigned short normal_i2c[] = {
39 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
40
41enum chips { lm83, lm82 };
42
43/*
44 * The LM83 registers
45 * Manufacturer ID is 0x01 for National Semiconductor.
46 */
47
48#define LM83_REG_R_MAN_ID 0xFE
49#define LM83_REG_R_CHIP_ID 0xFF
50#define LM83_REG_R_CONFIG 0x03
51#define LM83_REG_W_CONFIG 0x09
52#define LM83_REG_R_STATUS1 0x02
53#define LM83_REG_R_STATUS2 0x35
54#define LM83_REG_R_LOCAL_TEMP 0x00
55#define LM83_REG_R_LOCAL_HIGH 0x05
56#define LM83_REG_W_LOCAL_HIGH 0x0B
57#define LM83_REG_R_REMOTE1_TEMP 0x30
58#define LM83_REG_R_REMOTE1_HIGH 0x38
59#define LM83_REG_W_REMOTE1_HIGH 0x50
60#define LM83_REG_R_REMOTE2_TEMP 0x01
61#define LM83_REG_R_REMOTE2_HIGH 0x07
62#define LM83_REG_W_REMOTE2_HIGH 0x0D
63#define LM83_REG_R_REMOTE3_TEMP 0x31
64#define LM83_REG_R_REMOTE3_HIGH 0x3A
65#define LM83_REG_W_REMOTE3_HIGH 0x52
66#define LM83_REG_R_TCRIT 0x42
67#define LM83_REG_W_TCRIT 0x5A
68
69/*
70 * Conversions and various macros
71 * The LM83 uses signed 8-bit values with LSB = 1 degree Celsius.
72 */
73
74#define TEMP_FROM_REG(val) ((val) * 1000)
75#define TEMP_TO_REG(val) ((val) <= -128000 ? -128 : \
76 (val) >= 127000 ? 127 : \
77 (val) < 0 ? ((val) - 500) / 1000 : \
78 ((val) + 500) / 1000)
79
80static const u8 LM83_REG_R_TEMP[] = {
81 LM83_REG_R_LOCAL_TEMP,
82 LM83_REG_R_REMOTE1_TEMP,
83 LM83_REG_R_REMOTE2_TEMP,
84 LM83_REG_R_REMOTE3_TEMP,
85 LM83_REG_R_LOCAL_HIGH,
86 LM83_REG_R_REMOTE1_HIGH,
87 LM83_REG_R_REMOTE2_HIGH,
88 LM83_REG_R_REMOTE3_HIGH,
89 LM83_REG_R_TCRIT,
90};
91
92static const u8 LM83_REG_W_HIGH[] = {
93 LM83_REG_W_LOCAL_HIGH,
94 LM83_REG_W_REMOTE1_HIGH,
95 LM83_REG_W_REMOTE2_HIGH,
96 LM83_REG_W_REMOTE3_HIGH,
97 LM83_REG_W_TCRIT,
98};
99
100/*
101 * Client data (each client gets its own)
102 */
103
104struct lm83_data {
105 struct i2c_client *client;
106 const struct attribute_group *groups[3];
107 struct mutex update_lock;
108 char valid; /* zero until following fields are valid */
109 unsigned long last_updated; /* in jiffies */
110
111 /* registers values */
112 s8 temp[9]; /* 0..3: input 1-4,
113 4..7: high limit 1-4,
114 8 : critical limit */
115 u16 alarms; /* bitvector, combined */
116};
117
118static struct lm83_data *lm83_update_device(struct device *dev)
119{
120 struct lm83_data *data = dev_get_drvdata(dev);
121 struct i2c_client *client = data->client;
122
123 mutex_lock(&data->update_lock);
124
125 if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
126 int nr;
127
128 dev_dbg(&client->dev, "Updating lm83 data.\n");
129 for (nr = 0; nr < 9; nr++) {
130 data->temp[nr] =
131 i2c_smbus_read_byte_data(client,
132 LM83_REG_R_TEMP[nr]);
133 }
134 data->alarms =
135 i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS1)
136 + (i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS2)
137 << 8);
138
139 data->last_updated = jiffies;
140 data->valid = 1;
141 }
142
143 mutex_unlock(&data->update_lock);
144
145 return data;
146}
147
148/*
149 * Sysfs stuff
150 */
151
152static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
153 char *buf)
154{
155 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
156 struct lm83_data *data = lm83_update_device(dev);
157 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
158}
159
160static ssize_t temp_store(struct device *dev,
161 struct device_attribute *devattr, const char *buf,
162 size_t count)
163{
164 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
165 struct lm83_data *data = dev_get_drvdata(dev);
166 struct i2c_client *client = data->client;
167 long val;
168 int nr = attr->index;
169 int err;
170
171 err = kstrtol(buf, 10, &val);
172 if (err < 0)
173 return err;
174
175 mutex_lock(&data->update_lock);
176 data->temp[nr] = TEMP_TO_REG(val);
177 i2c_smbus_write_byte_data(client, LM83_REG_W_HIGH[nr - 4],
178 data->temp[nr]);
179 mutex_unlock(&data->update_lock);
180 return count;
181}
182
183static ssize_t alarms_show(struct device *dev, struct device_attribute *dummy,
184 char *buf)
185{
186 struct lm83_data *data = lm83_update_device(dev);
187 return sprintf(buf, "%d\n", data->alarms);
188}
189
190static ssize_t alarm_show(struct device *dev,
191 struct device_attribute *devattr, char *buf)
192{
193 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
194 struct lm83_data *data = lm83_update_device(dev);
195 int bitnr = attr->index;
196
197 return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
198}
199
200static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0);
201static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1);
202static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 2);
203static SENSOR_DEVICE_ATTR_RO(temp4_input, temp, 3);
204static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, 4);
205static SENSOR_DEVICE_ATTR_RW(temp2_max, temp, 5);
206static SENSOR_DEVICE_ATTR_RW(temp3_max, temp, 6);
207static SENSOR_DEVICE_ATTR_RW(temp4_max, temp, 7);
208static SENSOR_DEVICE_ATTR_RO(temp1_crit, temp, 8);
209static SENSOR_DEVICE_ATTR_RO(temp2_crit, temp, 8);
210static SENSOR_DEVICE_ATTR_RW(temp3_crit, temp, 8);
211static SENSOR_DEVICE_ATTR_RO(temp4_crit, temp, 8);
212
213/* Individual alarm files */
214static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 0);
215static SENSOR_DEVICE_ATTR_RO(temp3_crit_alarm, alarm, 1);
216static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 2);
217static SENSOR_DEVICE_ATTR_RO(temp3_max_alarm, alarm, 4);
218static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 6);
219static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 8);
220static SENSOR_DEVICE_ATTR_RO(temp4_crit_alarm, alarm, 9);
221static SENSOR_DEVICE_ATTR_RO(temp4_fault, alarm, 10);
222static SENSOR_DEVICE_ATTR_RO(temp4_max_alarm, alarm, 12);
223static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 13);
224static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 15);
225/* Raw alarm file for compatibility */
226static DEVICE_ATTR_RO(alarms);
227
228static struct attribute *lm83_attributes[] = {
229 &sensor_dev_attr_temp1_input.dev_attr.attr,
230 &sensor_dev_attr_temp3_input.dev_attr.attr,
231 &sensor_dev_attr_temp1_max.dev_attr.attr,
232 &sensor_dev_attr_temp3_max.dev_attr.attr,
233 &sensor_dev_attr_temp1_crit.dev_attr.attr,
234 &sensor_dev_attr_temp3_crit.dev_attr.attr,
235
236 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
237 &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
238 &sensor_dev_attr_temp3_fault.dev_attr.attr,
239 &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
240 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
241 &dev_attr_alarms.attr,
242 NULL
243};
244
245static const struct attribute_group lm83_group = {
246 .attrs = lm83_attributes,
247};
248
249static struct attribute *lm83_attributes_opt[] = {
250 &sensor_dev_attr_temp2_input.dev_attr.attr,
251 &sensor_dev_attr_temp4_input.dev_attr.attr,
252 &sensor_dev_attr_temp2_max.dev_attr.attr,
253 &sensor_dev_attr_temp4_max.dev_attr.attr,
254 &sensor_dev_attr_temp2_crit.dev_attr.attr,
255 &sensor_dev_attr_temp4_crit.dev_attr.attr,
256
257 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
258 &sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
259 &sensor_dev_attr_temp4_fault.dev_attr.attr,
260 &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
261 &sensor_dev_attr_temp2_fault.dev_attr.attr,
262 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
263 NULL
264};
265
266static const struct attribute_group lm83_group_opt = {
267 .attrs = lm83_attributes_opt,
268};
269
270/*
271 * Real code
272 */
273
274/* Return 0 if detection is successful, -ENODEV otherwise */
275static int lm83_detect(struct i2c_client *new_client,
276 struct i2c_board_info *info)
277{
278 struct i2c_adapter *adapter = new_client->adapter;
279 const char *name;
280 u8 man_id, chip_id;
281
282 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
283 return -ENODEV;
284
285 /* Detection */
286 if ((i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS1) & 0xA8) ||
287 (i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS2) & 0x48) ||
288 (i2c_smbus_read_byte_data(new_client, LM83_REG_R_CONFIG) & 0x41)) {
289 dev_dbg(&adapter->dev, "LM83 detection failed at 0x%02x\n",
290 new_client->addr);
291 return -ENODEV;
292 }
293
294 /* Identification */
295 man_id = i2c_smbus_read_byte_data(new_client, LM83_REG_R_MAN_ID);
296 if (man_id != 0x01) /* National Semiconductor */
297 return -ENODEV;
298
299 chip_id = i2c_smbus_read_byte_data(new_client, LM83_REG_R_CHIP_ID);
300 switch (chip_id) {
301 case 0x03:
302 name = "lm83";
303 break;
304 case 0x01:
305 name = "lm82";
306 break;
307 default:
308 /* identification failed */
309 dev_info(&adapter->dev,
310 "Unsupported chip (man_id=0x%02X, chip_id=0x%02X)\n",
311 man_id, chip_id);
312 return -ENODEV;
313 }
314
315 strlcpy(info->type, name, I2C_NAME_SIZE);
316
317 return 0;
318}
319
320static int lm83_probe(struct i2c_client *new_client,
321 const struct i2c_device_id *id)
322{
323 struct device *hwmon_dev;
324 struct lm83_data *data;
325
326 data = devm_kzalloc(&new_client->dev, sizeof(struct lm83_data),
327 GFP_KERNEL);
328 if (!data)
329 return -ENOMEM;
330
331 data->client = new_client;
332 mutex_init(&data->update_lock);
333
334 /*
335 * Register sysfs hooks
336 * The LM82 can only monitor one external diode which is
337 * at the same register as the LM83 temp3 entry - so we
338 * declare 1 and 3 common, and then 2 and 4 only for the LM83.
339 */
340 data->groups[0] = &lm83_group;
341 if (id->driver_data == lm83)
342 data->groups[1] = &lm83_group_opt;
343
344 hwmon_dev = devm_hwmon_device_register_with_groups(&new_client->dev,
345 new_client->name,
346 data, data->groups);
347 return PTR_ERR_OR_ZERO(hwmon_dev);
348}
349
350/*
351 * Driver data (common to all clients)
352 */
353
354static const struct i2c_device_id lm83_id[] = {
355 { "lm83", lm83 },
356 { "lm82", lm82 },
357 { }
358};
359MODULE_DEVICE_TABLE(i2c, lm83_id);
360
361static struct i2c_driver lm83_driver = {
362 .class = I2C_CLASS_HWMON,
363 .driver = {
364 .name = "lm83",
365 },
366 .probe = lm83_probe,
367 .id_table = lm83_id,
368 .detect = lm83_detect,
369 .address_list = normal_i2c,
370};
371
372module_i2c_driver(lm83_driver);
373
374MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
375MODULE_DESCRIPTION("LM83 driver");
376MODULE_LICENSE("GPL");