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1da177e4 LT |
1 | /* |
2 | * lm83.c - Part of lm_sensors, Linux kernel modules for hardware | |
3 | * monitoring | |
4 | * Copyright (C) 2003 Jean Delvare <khali@linux-fr.org> | |
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 | * This program is free software; you can redistribute it and/or modify | |
16 | * it under the terms of the GNU General Public License as published by | |
17 | * the Free Software Foundation; either version 2 of the License, or | |
18 | * (at your option) any later version. | |
19 | * | |
20 | * This program is distributed in the hope that it will be useful, | |
21 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
22 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
23 | * GNU General Public License for more details. | |
24 | * | |
25 | * You should have received a copy of the GNU General Public License | |
26 | * along with this program; if not, write to the Free Software | |
27 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
28 | */ | |
29 | ||
1da177e4 LT |
30 | #include <linux/module.h> |
31 | #include <linux/init.h> | |
32 | #include <linux/slab.h> | |
33 | #include <linux/jiffies.h> | |
34 | #include <linux/i2c.h> | |
35 | #include <linux/i2c-sensor.h> | |
36 | ||
37 | /* | |
38 | * Addresses to scan | |
39 | * Address is selected using 2 three-level pins, resulting in 9 possible | |
40 | * addresses. | |
41 | */ | |
42 | ||
43 | static unsigned short normal_i2c[] = { 0x18, 0x19, 0x1a, | |
44 | 0x29, 0x2a, 0x2b, | |
45 | 0x4c, 0x4d, 0x4e, | |
46 | I2C_CLIENT_END }; | |
47 | static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END }; | |
48 | ||
49 | /* | |
50 | * Insmod parameters | |
51 | */ | |
52 | ||
53 | SENSORS_INSMOD_1(lm83); | |
54 | ||
55 | /* | |
56 | * The LM83 registers | |
57 | * Manufacturer ID is 0x01 for National Semiconductor. | |
58 | */ | |
59 | ||
60 | #define LM83_REG_R_MAN_ID 0xFE | |
61 | #define LM83_REG_R_CHIP_ID 0xFF | |
62 | #define LM83_REG_R_CONFIG 0x03 | |
63 | #define LM83_REG_W_CONFIG 0x09 | |
64 | #define LM83_REG_R_STATUS1 0x02 | |
65 | #define LM83_REG_R_STATUS2 0x35 | |
66 | #define LM83_REG_R_LOCAL_TEMP 0x00 | |
67 | #define LM83_REG_R_LOCAL_HIGH 0x05 | |
68 | #define LM83_REG_W_LOCAL_HIGH 0x0B | |
69 | #define LM83_REG_R_REMOTE1_TEMP 0x30 | |
70 | #define LM83_REG_R_REMOTE1_HIGH 0x38 | |
71 | #define LM83_REG_W_REMOTE1_HIGH 0x50 | |
72 | #define LM83_REG_R_REMOTE2_TEMP 0x01 | |
73 | #define LM83_REG_R_REMOTE2_HIGH 0x07 | |
74 | #define LM83_REG_W_REMOTE2_HIGH 0x0D | |
75 | #define LM83_REG_R_REMOTE3_TEMP 0x31 | |
76 | #define LM83_REG_R_REMOTE3_HIGH 0x3A | |
77 | #define LM83_REG_W_REMOTE3_HIGH 0x52 | |
78 | #define LM83_REG_R_TCRIT 0x42 | |
79 | #define LM83_REG_W_TCRIT 0x5A | |
80 | ||
81 | /* | |
82 | * Conversions and various macros | |
44bbe87e | 83 | * The LM83 uses signed 8-bit values with LSB = 1 degree Celsius. |
1da177e4 LT |
84 | */ |
85 | ||
86 | #define TEMP_FROM_REG(val) ((val) * 1000) | |
87 | #define TEMP_TO_REG(val) ((val) <= -128000 ? -128 : \ | |
88 | (val) >= 127000 ? 127 : \ | |
89 | (val) < 0 ? ((val) - 500) / 1000 : \ | |
90 | ((val) + 500) / 1000) | |
91 | ||
92 | static const u8 LM83_REG_R_TEMP[] = { | |
93 | LM83_REG_R_LOCAL_TEMP, | |
94 | LM83_REG_R_REMOTE1_TEMP, | |
95 | LM83_REG_R_REMOTE2_TEMP, | |
96 | LM83_REG_R_REMOTE3_TEMP | |
97 | }; | |
98 | ||
99 | static const u8 LM83_REG_R_HIGH[] = { | |
100 | LM83_REG_R_LOCAL_HIGH, | |
101 | LM83_REG_R_REMOTE1_HIGH, | |
102 | LM83_REG_R_REMOTE2_HIGH, | |
103 | LM83_REG_R_REMOTE3_HIGH | |
104 | }; | |
105 | ||
106 | static const u8 LM83_REG_W_HIGH[] = { | |
107 | LM83_REG_W_LOCAL_HIGH, | |
108 | LM83_REG_W_REMOTE1_HIGH, | |
109 | LM83_REG_W_REMOTE2_HIGH, | |
110 | LM83_REG_W_REMOTE3_HIGH | |
111 | }; | |
112 | ||
113 | /* | |
114 | * Functions declaration | |
115 | */ | |
116 | ||
117 | static int lm83_attach_adapter(struct i2c_adapter *adapter); | |
118 | static int lm83_detect(struct i2c_adapter *adapter, int address, int kind); | |
119 | static int lm83_detach_client(struct i2c_client *client); | |
120 | static struct lm83_data *lm83_update_device(struct device *dev); | |
121 | ||
122 | /* | |
123 | * Driver data (common to all clients) | |
124 | */ | |
125 | ||
126 | static struct i2c_driver lm83_driver = { | |
127 | .owner = THIS_MODULE, | |
128 | .name = "lm83", | |
129 | .id = I2C_DRIVERID_LM83, | |
130 | .flags = I2C_DF_NOTIFY, | |
131 | .attach_adapter = lm83_attach_adapter, | |
132 | .detach_client = lm83_detach_client, | |
133 | }; | |
134 | ||
135 | /* | |
136 | * Client data (each client gets its own) | |
137 | */ | |
138 | ||
139 | struct lm83_data { | |
140 | struct i2c_client client; | |
141 | struct semaphore update_lock; | |
142 | char valid; /* zero until following fields are valid */ | |
143 | unsigned long last_updated; /* in jiffies */ | |
144 | ||
145 | /* registers values */ | |
146 | s8 temp_input[4]; | |
147 | s8 temp_high[4]; | |
148 | s8 temp_crit; | |
149 | u16 alarms; /* bitvector, combined */ | |
150 | }; | |
151 | ||
152 | /* | |
153 | * Sysfs stuff | |
154 | */ | |
155 | ||
156 | #define show_temp(suffix, value) \ | |
8627f9ba | 157 | static ssize_t show_temp_##suffix(struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
158 | { \ |
159 | struct lm83_data *data = lm83_update_device(dev); \ | |
160 | return sprintf(buf, "%d\n", TEMP_FROM_REG(data->value)); \ | |
161 | } | |
162 | show_temp(input1, temp_input[0]); | |
163 | show_temp(input2, temp_input[1]); | |
164 | show_temp(input3, temp_input[2]); | |
165 | show_temp(input4, temp_input[3]); | |
166 | show_temp(high1, temp_high[0]); | |
167 | show_temp(high2, temp_high[1]); | |
168 | show_temp(high3, temp_high[2]); | |
169 | show_temp(high4, temp_high[3]); | |
170 | show_temp(crit, temp_crit); | |
171 | ||
172 | #define set_temp(suffix, value, reg) \ | |
8627f9ba | 173 | static ssize_t set_temp_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \ |
1da177e4 LT |
174 | size_t count) \ |
175 | { \ | |
176 | struct i2c_client *client = to_i2c_client(dev); \ | |
177 | struct lm83_data *data = i2c_get_clientdata(client); \ | |
178 | long val = simple_strtol(buf, NULL, 10); \ | |
179 | \ | |
180 | down(&data->update_lock); \ | |
181 | data->value = TEMP_TO_REG(val); \ | |
182 | i2c_smbus_write_byte_data(client, reg, data->value); \ | |
183 | up(&data->update_lock); \ | |
184 | return count; \ | |
185 | } | |
186 | set_temp(high1, temp_high[0], LM83_REG_W_LOCAL_HIGH); | |
187 | set_temp(high2, temp_high[1], LM83_REG_W_REMOTE1_HIGH); | |
188 | set_temp(high3, temp_high[2], LM83_REG_W_REMOTE2_HIGH); | |
189 | set_temp(high4, temp_high[3], LM83_REG_W_REMOTE3_HIGH); | |
190 | set_temp(crit, temp_crit, LM83_REG_W_TCRIT); | |
191 | ||
8627f9ba | 192 | static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
193 | { |
194 | struct lm83_data *data = lm83_update_device(dev); | |
195 | return sprintf(buf, "%d\n", data->alarms); | |
196 | } | |
197 | ||
198 | static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL); | |
199 | static DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input2, NULL); | |
200 | static DEVICE_ATTR(temp3_input, S_IRUGO, show_temp_input3, NULL); | |
201 | static DEVICE_ATTR(temp4_input, S_IRUGO, show_temp_input4, NULL); | |
202 | static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_high1, | |
203 | set_temp_high1); | |
204 | static DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_high2, | |
205 | set_temp_high2); | |
206 | static DEVICE_ATTR(temp3_max, S_IWUSR | S_IRUGO, show_temp_high3, | |
207 | set_temp_high3); | |
208 | static DEVICE_ATTR(temp4_max, S_IWUSR | S_IRUGO, show_temp_high4, | |
209 | set_temp_high4); | |
210 | static DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp_crit, NULL); | |
211 | static DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp_crit, NULL); | |
212 | static DEVICE_ATTR(temp3_crit, S_IWUSR | S_IRUGO, show_temp_crit, | |
213 | set_temp_crit); | |
214 | static DEVICE_ATTR(temp4_crit, S_IRUGO, show_temp_crit, NULL); | |
215 | static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); | |
216 | ||
217 | /* | |
218 | * Real code | |
219 | */ | |
220 | ||
221 | static int lm83_attach_adapter(struct i2c_adapter *adapter) | |
222 | { | |
223 | if (!(adapter->class & I2C_CLASS_HWMON)) | |
224 | return 0; | |
225 | return i2c_detect(adapter, &addr_data, lm83_detect); | |
226 | } | |
227 | ||
228 | /* | |
229 | * The following function does more than just detection. If detection | |
230 | * succeeds, it also registers the new chip. | |
231 | */ | |
232 | static int lm83_detect(struct i2c_adapter *adapter, int address, int kind) | |
233 | { | |
234 | struct i2c_client *new_client; | |
235 | struct lm83_data *data; | |
236 | int err = 0; | |
237 | const char *name = ""; | |
238 | ||
239 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
240 | goto exit; | |
241 | ||
242 | if (!(data = kmalloc(sizeof(struct lm83_data), GFP_KERNEL))) { | |
243 | err = -ENOMEM; | |
244 | goto exit; | |
245 | } | |
246 | memset(data, 0, sizeof(struct lm83_data)); | |
247 | ||
248 | /* The common I2C client data is placed right after the | |
249 | * LM83-specific data. */ | |
250 | new_client = &data->client; | |
251 | i2c_set_clientdata(new_client, data); | |
252 | new_client->addr = address; | |
253 | new_client->adapter = adapter; | |
254 | new_client->driver = &lm83_driver; | |
255 | new_client->flags = 0; | |
256 | ||
257 | /* Now we do the detection and identification. A negative kind | |
258 | * means that the driver was loaded with no force parameter | |
259 | * (default), so we must both detect and identify the chip | |
260 | * (actually there is only one possible kind of chip for now, LM83). | |
261 | * A zero kind means that the driver was loaded with the force | |
262 | * parameter, the detection step shall be skipped. A positive kind | |
263 | * means that the driver was loaded with the force parameter and a | |
264 | * given kind of chip is requested, so both the detection and the | |
265 | * identification steps are skipped. */ | |
266 | ||
267 | /* Default to an LM83 if forced */ | |
268 | if (kind == 0) | |
269 | kind = lm83; | |
270 | ||
271 | if (kind < 0) { /* detection */ | |
272 | if (((i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS1) | |
273 | & 0xA8) != 0x00) || | |
274 | ((i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS2) | |
275 | & 0x48) != 0x00) || | |
276 | ((i2c_smbus_read_byte_data(new_client, LM83_REG_R_CONFIG) | |
277 | & 0x41) != 0x00)) { | |
278 | dev_dbg(&adapter->dev, | |
279 | "LM83 detection failed at 0x%02x.\n", address); | |
280 | goto exit_free; | |
281 | } | |
282 | } | |
283 | ||
284 | if (kind <= 0) { /* identification */ | |
285 | u8 man_id, chip_id; | |
286 | ||
287 | man_id = i2c_smbus_read_byte_data(new_client, | |
288 | LM83_REG_R_MAN_ID); | |
289 | chip_id = i2c_smbus_read_byte_data(new_client, | |
290 | LM83_REG_R_CHIP_ID); | |
291 | ||
292 | if (man_id == 0x01) { /* National Semiconductor */ | |
293 | if (chip_id == 0x03) { | |
294 | kind = lm83; | |
295 | } | |
296 | } | |
297 | ||
298 | if (kind <= 0) { /* identification failed */ | |
299 | dev_info(&adapter->dev, | |
300 | "Unsupported chip (man_id=0x%02X, " | |
301 | "chip_id=0x%02X).\n", man_id, chip_id); | |
302 | goto exit_free; | |
303 | } | |
304 | } | |
305 | ||
306 | if (kind == lm83) { | |
307 | name = "lm83"; | |
308 | } | |
309 | ||
310 | /* We can fill in the remaining client fields */ | |
311 | strlcpy(new_client->name, name, I2C_NAME_SIZE); | |
312 | data->valid = 0; | |
313 | init_MUTEX(&data->update_lock); | |
314 | ||
315 | /* Tell the I2C layer a new client has arrived */ | |
316 | if ((err = i2c_attach_client(new_client))) | |
317 | goto exit_free; | |
318 | ||
319 | /* | |
320 | * Initialize the LM83 chip | |
321 | * (Nothing to do for this one.) | |
322 | */ | |
323 | ||
324 | /* Register sysfs hooks */ | |
325 | device_create_file(&new_client->dev, &dev_attr_temp1_input); | |
326 | device_create_file(&new_client->dev, &dev_attr_temp2_input); | |
327 | device_create_file(&new_client->dev, &dev_attr_temp3_input); | |
328 | device_create_file(&new_client->dev, &dev_attr_temp4_input); | |
329 | device_create_file(&new_client->dev, &dev_attr_temp1_max); | |
330 | device_create_file(&new_client->dev, &dev_attr_temp2_max); | |
331 | device_create_file(&new_client->dev, &dev_attr_temp3_max); | |
332 | device_create_file(&new_client->dev, &dev_attr_temp4_max); | |
333 | device_create_file(&new_client->dev, &dev_attr_temp1_crit); | |
334 | device_create_file(&new_client->dev, &dev_attr_temp2_crit); | |
335 | device_create_file(&new_client->dev, &dev_attr_temp3_crit); | |
336 | device_create_file(&new_client->dev, &dev_attr_temp4_crit); | |
337 | device_create_file(&new_client->dev, &dev_attr_alarms); | |
338 | ||
339 | return 0; | |
340 | ||
341 | exit_free: | |
342 | kfree(data); | |
343 | exit: | |
344 | return err; | |
345 | } | |
346 | ||
347 | static int lm83_detach_client(struct i2c_client *client) | |
348 | { | |
349 | int err; | |
350 | ||
351 | if ((err = i2c_detach_client(client))) { | |
352 | dev_err(&client->dev, | |
353 | "Client deregistration failed, client not detached.\n"); | |
354 | return err; | |
355 | } | |
356 | ||
357 | kfree(i2c_get_clientdata(client)); | |
358 | return 0; | |
359 | } | |
360 | ||
361 | static struct lm83_data *lm83_update_device(struct device *dev) | |
362 | { | |
363 | struct i2c_client *client = to_i2c_client(dev); | |
364 | struct lm83_data *data = i2c_get_clientdata(client); | |
365 | ||
366 | down(&data->update_lock); | |
367 | ||
368 | if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) { | |
369 | int nr; | |
370 | ||
371 | dev_dbg(&client->dev, "Updating lm83 data.\n"); | |
372 | for (nr = 0; nr < 4 ; nr++) { | |
373 | data->temp_input[nr] = | |
374 | i2c_smbus_read_byte_data(client, | |
375 | LM83_REG_R_TEMP[nr]); | |
376 | data->temp_high[nr] = | |
377 | i2c_smbus_read_byte_data(client, | |
378 | LM83_REG_R_HIGH[nr]); | |
379 | } | |
380 | data->temp_crit = | |
381 | i2c_smbus_read_byte_data(client, LM83_REG_R_TCRIT); | |
382 | data->alarms = | |
383 | i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS1) | |
384 | + (i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS2) | |
385 | << 8); | |
386 | ||
387 | data->last_updated = jiffies; | |
388 | data->valid = 1; | |
389 | } | |
390 | ||
391 | up(&data->update_lock); | |
392 | ||
393 | return data; | |
394 | } | |
395 | ||
396 | static int __init sensors_lm83_init(void) | |
397 | { | |
398 | return i2c_add_driver(&lm83_driver); | |
399 | } | |
400 | ||
401 | static void __exit sensors_lm83_exit(void) | |
402 | { | |
403 | i2c_del_driver(&lm83_driver); | |
404 | } | |
405 | ||
406 | MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>"); | |
407 | MODULE_DESCRIPTION("LM83 driver"); | |
408 | MODULE_LICENSE("GPL"); | |
409 | ||
410 | module_init(sensors_lm83_init); | |
411 | module_exit(sensors_lm83_exit); |