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c942fddf | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * lm83.c - Part of lm_sensors, Linux kernel modules for hardware | |
4 | * monitoring | |
7c81c60f | 5 | * Copyright (C) 2003-2009 Jean Delvare <jdelvare@suse.de> |
1da177e4 LT |
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 | * | |
43cb7ebe JC |
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 | |
1da177e4 LT |
19 | */ |
20 | ||
1da177e4 LT |
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> | |
10c08f81 | 26 | #include <linux/hwmon-sysfs.h> |
943b0830 MH |
27 | #include <linux/hwmon.h> |
28 | #include <linux/err.h> | |
9a61bf63 | 29 | #include <linux/mutex.h> |
0e39e01c | 30 | #include <linux/sysfs.h> |
1da177e4 LT |
31 | |
32 | /* | |
33 | * Addresses to scan | |
34 | * Address is selected using 2 three-level pins, resulting in 9 possible | |
35 | * addresses. | |
36 | */ | |
37 | ||
25e9c86d MH |
38 | static const unsigned short normal_i2c[] = { |
39 | 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END }; | |
1da177e4 | 40 | |
e5e9f44c | 41 | enum chips { lm83, lm82 }; |
1da177e4 LT |
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 | |
44bbe87e | 71 | * The LM83 uses signed 8-bit values with LSB = 1 degree Celsius. |
1da177e4 LT |
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 | ||
80 | static const u8 LM83_REG_R_TEMP[] = { | |
81 | LM83_REG_R_LOCAL_TEMP, | |
82 | LM83_REG_R_REMOTE1_TEMP, | |
83 | LM83_REG_R_REMOTE2_TEMP, | |
1a86c051 | 84 | LM83_REG_R_REMOTE3_TEMP, |
1da177e4 LT |
85 | LM83_REG_R_LOCAL_HIGH, |
86 | LM83_REG_R_REMOTE1_HIGH, | |
87 | LM83_REG_R_REMOTE2_HIGH, | |
1a86c051 JD |
88 | LM83_REG_R_REMOTE3_HIGH, |
89 | LM83_REG_R_TCRIT, | |
1da177e4 LT |
90 | }; |
91 | ||
92 | static const u8 LM83_REG_W_HIGH[] = { | |
93 | LM83_REG_W_LOCAL_HIGH, | |
94 | LM83_REG_W_REMOTE1_HIGH, | |
95 | LM83_REG_W_REMOTE2_HIGH, | |
1a86c051 JD |
96 | LM83_REG_W_REMOTE3_HIGH, |
97 | LM83_REG_W_TCRIT, | |
1da177e4 LT |
98 | }; |
99 | ||
1da177e4 LT |
100 | /* |
101 | * Client data (each client gets its own) | |
102 | */ | |
103 | ||
104 | struct lm83_data { | |
a0ac840d GR |
105 | struct i2c_client *client; |
106 | const struct attribute_group *groups[3]; | |
9a61bf63 | 107 | struct mutex update_lock; |
1da177e4 LT |
108 | char valid; /* zero until following fields are valid */ |
109 | unsigned long last_updated; /* in jiffies */ | |
110 | ||
111 | /* registers values */ | |
1a86c051 JD |
112 | s8 temp[9]; /* 0..3: input 1-4, |
113 | 4..7: high limit 1-4, | |
114 | 8 : critical limit */ | |
1da177e4 LT |
115 | u16 alarms; /* bitvector, combined */ |
116 | }; | |
117 | ||
41936370 GR |
118 | static struct lm83_data *lm83_update_device(struct device *dev) |
119 | { | |
a0ac840d GR |
120 | struct lm83_data *data = dev_get_drvdata(dev); |
121 | struct i2c_client *client = data->client; | |
41936370 GR |
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 | ||
1da177e4 LT |
148 | /* |
149 | * Sysfs stuff | |
150 | */ | |
151 | ||
a9283c8f | 152 | static ssize_t temp_show(struct device *dev, struct device_attribute *devattr, |
1a86c051 JD |
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])); | |
1da177e4 | 158 | } |
1a86c051 | 159 | |
a9283c8f GR |
160 | static ssize_t temp_store(struct device *dev, |
161 | struct device_attribute *devattr, const char *buf, | |
162 | size_t count) | |
1a86c051 JD |
163 | { |
164 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
a0ac840d GR |
165 | struct lm83_data *data = dev_get_drvdata(dev); |
166 | struct i2c_client *client = data->client; | |
b3789a0d | 167 | long val; |
1a86c051 | 168 | int nr = attr->index; |
b3789a0d FM |
169 | int err; |
170 | ||
171 | err = kstrtol(buf, 10, &val); | |
172 | if (err < 0) | |
173 | return err; | |
1a86c051 | 174 | |
9a61bf63 | 175 | mutex_lock(&data->update_lock); |
1a86c051 JD |
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]); | |
9a61bf63 | 179 | mutex_unlock(&data->update_lock); |
1a86c051 | 180 | return count; |
1da177e4 | 181 | } |
1da177e4 | 182 | |
14c05198 | 183 | static ssize_t alarms_show(struct device *dev, struct device_attribute *dummy, |
1a86c051 | 184 | char *buf) |
1da177e4 LT |
185 | { |
186 | struct lm83_data *data = lm83_update_device(dev); | |
187 | return sprintf(buf, "%d\n", data->alarms); | |
188 | } | |
189 | ||
a9283c8f GR |
190 | static ssize_t alarm_show(struct device *dev, |
191 | struct device_attribute *devattr, char *buf) | |
2d45771e JD |
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 | ||
a9283c8f GR |
200 | static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0); |
201 | static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1); | |
202 | static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 2); | |
203 | static SENSOR_DEVICE_ATTR_RO(temp4_input, temp, 3); | |
204 | static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, 4); | |
205 | static SENSOR_DEVICE_ATTR_RW(temp2_max, temp, 5); | |
206 | static SENSOR_DEVICE_ATTR_RW(temp3_max, temp, 6); | |
207 | static SENSOR_DEVICE_ATTR_RW(temp4_max, temp, 7); | |
208 | static SENSOR_DEVICE_ATTR_RO(temp1_crit, temp, 8); | |
209 | static SENSOR_DEVICE_ATTR_RO(temp2_crit, temp, 8); | |
210 | static SENSOR_DEVICE_ATTR_RW(temp3_crit, temp, 8); | |
211 | static SENSOR_DEVICE_ATTR_RO(temp4_crit, temp, 8); | |
2d45771e JD |
212 | |
213 | /* Individual alarm files */ | |
a9283c8f GR |
214 | static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 0); |
215 | static SENSOR_DEVICE_ATTR_RO(temp3_crit_alarm, alarm, 1); | |
216 | static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 2); | |
217 | static SENSOR_DEVICE_ATTR_RO(temp3_max_alarm, alarm, 4); | |
218 | static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 6); | |
219 | static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 8); | |
220 | static SENSOR_DEVICE_ATTR_RO(temp4_crit_alarm, alarm, 9); | |
221 | static SENSOR_DEVICE_ATTR_RO(temp4_fault, alarm, 10); | |
222 | static SENSOR_DEVICE_ATTR_RO(temp4_max_alarm, alarm, 12); | |
223 | static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 13); | |
224 | static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 15); | |
2d45771e | 225 | /* Raw alarm file for compatibility */ |
14c05198 | 226 | static DEVICE_ATTR_RO(alarms); |
1da177e4 | 227 | |
0e39e01c JD |
228 | static 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, | |
7817a39e | 238 | &sensor_dev_attr_temp3_fault.dev_attr.attr, |
0e39e01c JD |
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 | ||
245 | static const struct attribute_group lm83_group = { | |
246 | .attrs = lm83_attributes, | |
247 | }; | |
248 | ||
249 | static 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, | |
7817a39e | 259 | &sensor_dev_attr_temp4_fault.dev_attr.attr, |
0e39e01c | 260 | &sensor_dev_attr_temp4_max_alarm.dev_attr.attr, |
7817a39e | 261 | &sensor_dev_attr_temp2_fault.dev_attr.attr, |
0e39e01c JD |
262 | &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, |
263 | NULL | |
264 | }; | |
265 | ||
266 | static const struct attribute_group lm83_group_opt = { | |
267 | .attrs = lm83_attributes_opt, | |
268 | }; | |
269 | ||
1da177e4 LT |
270 | /* |
271 | * Real code | |
272 | */ | |
273 | ||
b6aacdce | 274 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
310ec792 | 275 | static int lm83_detect(struct i2c_client *new_client, |
b6aacdce | 276 | struct i2c_board_info *info) |
1da177e4 | 277 | { |
b6aacdce | 278 | struct i2c_adapter *adapter = new_client->adapter; |
b57dc394 JD |
279 | const char *name; |
280 | u8 man_id, chip_id; | |
1da177e4 LT |
281 | |
282 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
b6aacdce | 283 | return -ENODEV; |
1da177e4 | 284 | |
b57dc394 JD |
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; | |
1da177e4 LT |
292 | } |
293 | ||
b57dc394 JD |
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; | |
1da177e4 | 298 | |
b57dc394 JD |
299 | chip_id = i2c_smbus_read_byte_data(new_client, LM83_REG_R_CHIP_ID); |
300 | switch (chip_id) { | |
301 | case 0x03: | |
1da177e4 | 302 | name = "lm83"; |
b57dc394 JD |
303 | break; |
304 | case 0x01: | |
43cb7ebe | 305 | name = "lm82"; |
b57dc394 JD |
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; | |
1da177e4 LT |
313 | } |
314 | ||
b6aacdce JD |
315 | strlcpy(info->type, name, I2C_NAME_SIZE); |
316 | ||
317 | return 0; | |
318 | } | |
319 | ||
320 | static int lm83_probe(struct i2c_client *new_client, | |
321 | const struct i2c_device_id *id) | |
322 | { | |
a0ac840d | 323 | struct device *hwmon_dev; |
b6aacdce | 324 | struct lm83_data *data; |
b6aacdce | 325 | |
c087f73a GR |
326 | data = devm_kzalloc(&new_client->dev, sizeof(struct lm83_data), |
327 | GFP_KERNEL); | |
328 | if (!data) | |
329 | return -ENOMEM; | |
b6aacdce | 330 | |
a0ac840d | 331 | data->client = new_client; |
9a61bf63 | 332 | mutex_init(&data->update_lock); |
1da177e4 | 333 | |
1da177e4 | 334 | /* |
0e39e01c | 335 | * Register sysfs hooks |
43cb7ebe JC |
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 | */ | |
a0ac840d GR |
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); | |
1da177e4 LT |
348 | } |
349 | ||
41936370 GR |
350 | /* |
351 | * Driver data (common to all clients) | |
352 | */ | |
1da177e4 | 353 | |
41936370 GR |
354 | static const struct i2c_device_id lm83_id[] = { |
355 | { "lm83", lm83 }, | |
356 | { "lm82", lm82 }, | |
357 | { } | |
358 | }; | |
359 | MODULE_DEVICE_TABLE(i2c, lm83_id); | |
1da177e4 | 360 | |
41936370 GR |
361 | static struct i2c_driver lm83_driver = { |
362 | .class = I2C_CLASS_HWMON, | |
363 | .driver = { | |
364 | .name = "lm83", | |
365 | }, | |
366 | .probe = lm83_probe, | |
41936370 GR |
367 | .id_table = lm83_id, |
368 | .detect = lm83_detect, | |
369 | .address_list = normal_i2c, | |
370 | }; | |
1da177e4 | 371 | |
f0967eea | 372 | module_i2c_driver(lm83_driver); |
1da177e4 | 373 | |
7c81c60f | 374 | MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>"); |
1da177e4 LT |
375 | MODULE_DESCRIPTION("LM83 driver"); |
376 | MODULE_LICENSE("GPL"); |