1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * lm80.c - From lm_sensors, Linux kernel modules for hardware |
4 | * monitoring |
5 | * Copyright (C) 1998, 1999 Frodo Looijaard <frodol@dds.nl> |
6 | * and Philip Edelbrock <phil@netroedge.com> |
7 | * |
8 | * Ported to Linux 2.6 by Tiago Sousa <mirage@kaotik.org> |
9 | */ |
10 | |
11 | #include <linux/module.h> |
12 | #include <linux/init.h> |
13 | #include <linux/slab.h> |
14 | #include <linux/jiffies.h> |
15 | #include <linux/i2c.h> |
16 | #include <linux/hwmon.h> |
17 | #include <linux/hwmon-sysfs.h> |
18 | #include <linux/err.h> |
19 | #include <linux/mutex.h> |
20 | |
21 | /* Addresses to scan */ |
22 | static const unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, |
23 | 0x2e, 0x2f, I2C_CLIENT_END }; |
24 | |
25 | /* Many LM80 constants specified below */ |
26 | |
27 | /* The LM80 registers */ |
28 | #define LM80_REG_IN_MAX(nr) (0x2a + (nr) * 2) |
29 | #define LM80_REG_IN_MIN(nr) (0x2b + (nr) * 2) |
30 | #define LM80_REG_IN(nr) (0x20 + (nr)) |
31 | |
32 | #define LM80_REG_FAN1 0x28 |
33 | #define LM80_REG_FAN2 0x29 |
34 | #define LM80_REG_FAN_MIN(nr) (0x3b + (nr)) |
35 | |
36 | #define LM80_REG_TEMP 0x27 |
37 | #define LM80_REG_TEMP_HOT_MAX 0x38 |
38 | #define LM80_REG_TEMP_HOT_HYST 0x39 |
39 | #define LM80_REG_TEMP_OS_MAX 0x3a |
40 | #define LM80_REG_TEMP_OS_HYST 0x3b |
41 | |
42 | #define LM80_REG_CONFIG 0x00 |
43 | #define LM80_REG_ALARM1 0x01 |
44 | #define LM80_REG_ALARM2 0x02 |
45 | #define LM80_REG_MASK1 0x03 |
46 | #define LM80_REG_MASK2 0x04 |
47 | #define LM80_REG_FANDIV 0x05 |
48 | #define LM80_REG_RES 0x06 |
49 | |
50 | #define LM96080_REG_CONV_RATE 0x07 |
51 | #define LM96080_REG_MAN_ID 0x3e |
52 | #define LM96080_REG_DEV_ID 0x3f |
53 | |
54 | |
55 | /* |
56 | * Conversions. Rounding and limit checking is only done on the TO_REG |
57 | * variants. Note that you should be a bit careful with which arguments |
58 | * these macros are called: arguments may be evaluated more than once. |
59 | * Fixing this is just not worth it. |
60 | */ |
61 | |
62 | #define IN_TO_REG(val) (clamp_val(((val) + 5) / 10, 0, 255)) |
63 | #define IN_FROM_REG(val) ((val) * 10) |
64 | |
65 | static inline unsigned char FAN_TO_REG(unsigned rpm, unsigned div) |
66 | { |
67 | if (rpm == 0) |
68 | return 255; |
69 | rpm = clamp_val(rpm, 1, 1000000); |
70 | return clamp_val((1350000 + rpm * div / 2) / (rpm * div), 1, 254); |
71 | } |
72 | |
73 | #define FAN_FROM_REG(val, div) ((val) == 0 ? -1 : \ |
74 | (val) == 255 ? 0 : 1350000/((div) * (val))) |
75 | |
76 | #define TEMP_FROM_REG(reg) ((reg) * 125 / 32) |
77 | #define TEMP_TO_REG(temp) (DIV_ROUND_CLOSEST(clamp_val((temp), \ |
78 | -128000, 127000), 1000) << 8) |
79 | |
80 | #define DIV_FROM_REG(val) (1 << (val)) |
81 | |
82 | enum temp_index { |
83 | t_input = 0, |
84 | t_hot_max, |
85 | t_hot_hyst, |
86 | t_os_max, |
87 | t_os_hyst, |
88 | t_num_temp |
89 | }; |
90 | |
91 | static const u8 temp_regs[t_num_temp] = { |
92 | [t_input] = LM80_REG_TEMP, |
93 | [t_hot_max] = LM80_REG_TEMP_HOT_MAX, |
94 | [t_hot_hyst] = LM80_REG_TEMP_HOT_HYST, |
95 | [t_os_max] = LM80_REG_TEMP_OS_MAX, |
96 | [t_os_hyst] = LM80_REG_TEMP_OS_HYST, |
97 | }; |
98 | |
99 | enum in_index { |
100 | i_input = 0, |
101 | i_max, |
102 | i_min, |
103 | i_num_in |
104 | }; |
105 | |
106 | enum fan_index { |
107 | f_input, |
108 | f_min, |
109 | f_num_fan |
110 | }; |
111 | |
112 | /* |
113 | * Client data (each client gets its own) |
114 | */ |
115 | |
116 | struct lm80_data { |
117 | struct i2c_client *client; |
118 | struct mutex update_lock; |
119 | char error; /* !=0 if error occurred during last update */ |
120 | bool valid; /* true if following fields are valid */ |
121 | unsigned long last_updated; /* In jiffies */ |
122 | |
123 | u8 in[i_num_in][7]; /* Register value, 1st index is enum in_index */ |
124 | u8 fan[f_num_fan][2]; /* Register value, 1st index enum fan_index */ |
125 | u8 fan_div[2]; /* Register encoding, shifted right */ |
126 | s16 temp[t_num_temp]; /* Register values, normalized to 16 bit */ |
127 | u16 alarms; /* Register encoding, combined */ |
128 | }; |
129 | |
130 | static int lm80_read_value(struct i2c_client *client, u8 reg) |
131 | { |
132 | return i2c_smbus_read_byte_data(client, command: reg); |
133 | } |
134 | |
135 | static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value) |
136 | { |
137 | return i2c_smbus_write_byte_data(client, command: reg, value); |
138 | } |
139 | |
140 | /* Called when we have found a new LM80 and after read errors */ |
141 | static void lm80_init_client(struct i2c_client *client) |
142 | { |
143 | /* |
144 | * Reset all except Watchdog values and last conversion values |
145 | * This sets fan-divs to 2, among others. This makes most other |
146 | * initializations unnecessary |
147 | */ |
148 | lm80_write_value(client, LM80_REG_CONFIG, value: 0x80); |
149 | /* Set 11-bit temperature resolution */ |
150 | lm80_write_value(client, LM80_REG_RES, value: 0x08); |
151 | |
152 | /* Start monitoring */ |
153 | lm80_write_value(client, LM80_REG_CONFIG, value: 0x01); |
154 | } |
155 | |
156 | static struct lm80_data *lm80_update_device(struct device *dev) |
157 | { |
158 | struct lm80_data *data = dev_get_drvdata(dev); |
159 | struct i2c_client *client = data->client; |
160 | int i; |
161 | int rv; |
162 | int prev_rv; |
163 | struct lm80_data *ret = data; |
164 | |
165 | mutex_lock(&data->update_lock); |
166 | |
167 | if (data->error) |
168 | lm80_init_client(client); |
169 | |
170 | if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) { |
171 | dev_dbg(dev, "Starting lm80 update\n" ); |
172 | for (i = 0; i <= 6; i++) { |
173 | rv = lm80_read_value(client, LM80_REG_IN(i)); |
174 | if (rv < 0) |
175 | goto abort; |
176 | data->in[i_input][i] = rv; |
177 | |
178 | rv = lm80_read_value(client, LM80_REG_IN_MIN(i)); |
179 | if (rv < 0) |
180 | goto abort; |
181 | data->in[i_min][i] = rv; |
182 | |
183 | rv = lm80_read_value(client, LM80_REG_IN_MAX(i)); |
184 | if (rv < 0) |
185 | goto abort; |
186 | data->in[i_max][i] = rv; |
187 | } |
188 | |
189 | rv = lm80_read_value(client, LM80_REG_FAN1); |
190 | if (rv < 0) |
191 | goto abort; |
192 | data->fan[f_input][0] = rv; |
193 | |
194 | rv = lm80_read_value(client, LM80_REG_FAN_MIN(1)); |
195 | if (rv < 0) |
196 | goto abort; |
197 | data->fan[f_min][0] = rv; |
198 | |
199 | rv = lm80_read_value(client, LM80_REG_FAN2); |
200 | if (rv < 0) |
201 | goto abort; |
202 | data->fan[f_input][1] = rv; |
203 | |
204 | rv = lm80_read_value(client, LM80_REG_FAN_MIN(2)); |
205 | if (rv < 0) |
206 | goto abort; |
207 | data->fan[f_min][1] = rv; |
208 | |
209 | prev_rv = rv = lm80_read_value(client, LM80_REG_TEMP); |
210 | if (rv < 0) |
211 | goto abort; |
212 | rv = lm80_read_value(client, LM80_REG_RES); |
213 | if (rv < 0) |
214 | goto abort; |
215 | data->temp[t_input] = (prev_rv << 8) | (rv & 0xf0); |
216 | |
217 | for (i = t_input + 1; i < t_num_temp; i++) { |
218 | rv = lm80_read_value(client, reg: temp_regs[i]); |
219 | if (rv < 0) |
220 | goto abort; |
221 | data->temp[i] = rv << 8; |
222 | } |
223 | |
224 | rv = lm80_read_value(client, LM80_REG_FANDIV); |
225 | if (rv < 0) |
226 | goto abort; |
227 | data->fan_div[0] = (rv >> 2) & 0x03; |
228 | data->fan_div[1] = (rv >> 4) & 0x03; |
229 | |
230 | prev_rv = rv = lm80_read_value(client, LM80_REG_ALARM1); |
231 | if (rv < 0) |
232 | goto abort; |
233 | rv = lm80_read_value(client, LM80_REG_ALARM2); |
234 | if (rv < 0) |
235 | goto abort; |
236 | data->alarms = prev_rv + (rv << 8); |
237 | |
238 | data->last_updated = jiffies; |
239 | data->valid = true; |
240 | data->error = 0; |
241 | } |
242 | goto done; |
243 | |
244 | abort: |
245 | ret = ERR_PTR(error: rv); |
246 | data->valid = false; |
247 | data->error = 1; |
248 | |
249 | done: |
250 | mutex_unlock(lock: &data->update_lock); |
251 | |
252 | return ret; |
253 | } |
254 | |
255 | /* |
256 | * Sysfs stuff |
257 | */ |
258 | |
259 | static ssize_t in_show(struct device *dev, struct device_attribute *attr, |
260 | char *buf) |
261 | { |
262 | struct lm80_data *data = lm80_update_device(dev); |
263 | int index = to_sensor_dev_attr_2(attr)->index; |
264 | int nr = to_sensor_dev_attr_2(attr)->nr; |
265 | |
266 | if (IS_ERR(ptr: data)) |
267 | return PTR_ERR(ptr: data); |
268 | return sprintf(buf, fmt: "%d\n" , IN_FROM_REG(data->in[nr][index])); |
269 | } |
270 | |
271 | static ssize_t in_store(struct device *dev, struct device_attribute *attr, |
272 | const char *buf, size_t count) |
273 | { |
274 | struct lm80_data *data = dev_get_drvdata(dev); |
275 | struct i2c_client *client = data->client; |
276 | int index = to_sensor_dev_attr_2(attr)->index; |
277 | int nr = to_sensor_dev_attr_2(attr)->nr; |
278 | long val; |
279 | u8 reg; |
280 | int err = kstrtol(s: buf, base: 10, res: &val); |
281 | if (err < 0) |
282 | return err; |
283 | |
284 | reg = nr == i_min ? LM80_REG_IN_MIN(index) : LM80_REG_IN_MAX(index); |
285 | |
286 | mutex_lock(&data->update_lock); |
287 | data->in[nr][index] = IN_TO_REG(val); |
288 | lm80_write_value(client, reg, value: data->in[nr][index]); |
289 | mutex_unlock(lock: &data->update_lock); |
290 | return count; |
291 | } |
292 | |
293 | static ssize_t fan_show(struct device *dev, struct device_attribute *attr, |
294 | char *buf) |
295 | { |
296 | int index = to_sensor_dev_attr_2(attr)->index; |
297 | int nr = to_sensor_dev_attr_2(attr)->nr; |
298 | struct lm80_data *data = lm80_update_device(dev); |
299 | if (IS_ERR(ptr: data)) |
300 | return PTR_ERR(ptr: data); |
301 | return sprintf(buf, fmt: "%d\n" , FAN_FROM_REG(data->fan[nr][index], |
302 | DIV_FROM_REG(data->fan_div[index]))); |
303 | } |
304 | |
305 | static ssize_t fan_div_show(struct device *dev, struct device_attribute *attr, |
306 | char *buf) |
307 | { |
308 | int nr = to_sensor_dev_attr(attr)->index; |
309 | struct lm80_data *data = lm80_update_device(dev); |
310 | if (IS_ERR(ptr: data)) |
311 | return PTR_ERR(ptr: data); |
312 | return sprintf(buf, fmt: "%d\n" , DIV_FROM_REG(data->fan_div[nr])); |
313 | } |
314 | |
315 | static ssize_t fan_store(struct device *dev, struct device_attribute *attr, |
316 | const char *buf, size_t count) |
317 | { |
318 | int index = to_sensor_dev_attr_2(attr)->index; |
319 | int nr = to_sensor_dev_attr_2(attr)->nr; |
320 | struct lm80_data *data = dev_get_drvdata(dev); |
321 | struct i2c_client *client = data->client; |
322 | unsigned long val; |
323 | int err = kstrtoul(s: buf, base: 10, res: &val); |
324 | if (err < 0) |
325 | return err; |
326 | |
327 | mutex_lock(&data->update_lock); |
328 | data->fan[nr][index] = FAN_TO_REG(rpm: val, |
329 | DIV_FROM_REG(data->fan_div[index])); |
330 | lm80_write_value(client, LM80_REG_FAN_MIN(index + 1), |
331 | value: data->fan[nr][index]); |
332 | mutex_unlock(lock: &data->update_lock); |
333 | return count; |
334 | } |
335 | |
336 | /* |
337 | * Note: we save and restore the fan minimum here, because its value is |
338 | * determined in part by the fan divisor. This follows the principle of |
339 | * least surprise; the user doesn't expect the fan minimum to change just |
340 | * because the divisor changed. |
341 | */ |
342 | static ssize_t fan_div_store(struct device *dev, |
343 | struct device_attribute *attr, const char *buf, |
344 | size_t count) |
345 | { |
346 | int nr = to_sensor_dev_attr(attr)->index; |
347 | struct lm80_data *data = dev_get_drvdata(dev); |
348 | struct i2c_client *client = data->client; |
349 | unsigned long min, val; |
350 | u8 reg; |
351 | int rv; |
352 | |
353 | rv = kstrtoul(s: buf, base: 10, res: &val); |
354 | if (rv < 0) |
355 | return rv; |
356 | |
357 | /* Save fan_min */ |
358 | mutex_lock(&data->update_lock); |
359 | min = FAN_FROM_REG(data->fan[f_min][nr], |
360 | DIV_FROM_REG(data->fan_div[nr])); |
361 | |
362 | switch (val) { |
363 | case 1: |
364 | data->fan_div[nr] = 0; |
365 | break; |
366 | case 2: |
367 | data->fan_div[nr] = 1; |
368 | break; |
369 | case 4: |
370 | data->fan_div[nr] = 2; |
371 | break; |
372 | case 8: |
373 | data->fan_div[nr] = 3; |
374 | break; |
375 | default: |
376 | dev_err(dev, |
377 | "fan_div value %ld not supported. Choose one of 1, 2, 4 or 8!\n" , |
378 | val); |
379 | mutex_unlock(lock: &data->update_lock); |
380 | return -EINVAL; |
381 | } |
382 | |
383 | rv = lm80_read_value(client, LM80_REG_FANDIV); |
384 | if (rv < 0) { |
385 | mutex_unlock(lock: &data->update_lock); |
386 | return rv; |
387 | } |
388 | reg = (rv & ~(3 << (2 * (nr + 1)))) |
389 | | (data->fan_div[nr] << (2 * (nr + 1))); |
390 | lm80_write_value(client, LM80_REG_FANDIV, value: reg); |
391 | |
392 | /* Restore fan_min */ |
393 | data->fan[f_min][nr] = FAN_TO_REG(rpm: min, DIV_FROM_REG(data->fan_div[nr])); |
394 | lm80_write_value(client, LM80_REG_FAN_MIN(nr + 1), |
395 | value: data->fan[f_min][nr]); |
396 | mutex_unlock(lock: &data->update_lock); |
397 | |
398 | return count; |
399 | } |
400 | |
401 | static ssize_t temp_show(struct device *dev, struct device_attribute *devattr, |
402 | char *buf) |
403 | { |
404 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
405 | struct lm80_data *data = lm80_update_device(dev); |
406 | if (IS_ERR(ptr: data)) |
407 | return PTR_ERR(ptr: data); |
408 | return sprintf(buf, fmt: "%d\n" , TEMP_FROM_REG(data->temp[attr->index])); |
409 | } |
410 | |
411 | static ssize_t temp_store(struct device *dev, |
412 | struct device_attribute *devattr, const char *buf, |
413 | size_t count) |
414 | { |
415 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
416 | struct lm80_data *data = dev_get_drvdata(dev); |
417 | struct i2c_client *client = data->client; |
418 | int nr = attr->index; |
419 | long val; |
420 | int err = kstrtol(s: buf, base: 10, res: &val); |
421 | if (err < 0) |
422 | return err; |
423 | |
424 | mutex_lock(&data->update_lock); |
425 | data->temp[nr] = TEMP_TO_REG(val); |
426 | lm80_write_value(client, reg: temp_regs[nr], value: data->temp[nr] >> 8); |
427 | mutex_unlock(lock: &data->update_lock); |
428 | return count; |
429 | } |
430 | |
431 | static ssize_t alarms_show(struct device *dev, struct device_attribute *attr, |
432 | char *buf) |
433 | { |
434 | struct lm80_data *data = lm80_update_device(dev); |
435 | if (IS_ERR(ptr: data)) |
436 | return PTR_ERR(ptr: data); |
437 | return sprintf(buf, fmt: "%u\n" , data->alarms); |
438 | } |
439 | |
440 | static ssize_t alarm_show(struct device *dev, struct device_attribute *attr, |
441 | char *buf) |
442 | { |
443 | int bitnr = to_sensor_dev_attr(attr)->index; |
444 | struct lm80_data *data = lm80_update_device(dev); |
445 | if (IS_ERR(ptr: data)) |
446 | return PTR_ERR(ptr: data); |
447 | return sprintf(buf, fmt: "%u\n" , (data->alarms >> bitnr) & 1); |
448 | } |
449 | |
450 | static SENSOR_DEVICE_ATTR_2_RW(in0_min, in, i_min, 0); |
451 | static SENSOR_DEVICE_ATTR_2_RW(in1_min, in, i_min, 1); |
452 | static SENSOR_DEVICE_ATTR_2_RW(in2_min, in, i_min, 2); |
453 | static SENSOR_DEVICE_ATTR_2_RW(in3_min, in, i_min, 3); |
454 | static SENSOR_DEVICE_ATTR_2_RW(in4_min, in, i_min, 4); |
455 | static SENSOR_DEVICE_ATTR_2_RW(in5_min, in, i_min, 5); |
456 | static SENSOR_DEVICE_ATTR_2_RW(in6_min, in, i_min, 6); |
457 | static SENSOR_DEVICE_ATTR_2_RW(in0_max, in, i_max, 0); |
458 | static SENSOR_DEVICE_ATTR_2_RW(in1_max, in, i_max, 1); |
459 | static SENSOR_DEVICE_ATTR_2_RW(in2_max, in, i_max, 2); |
460 | static SENSOR_DEVICE_ATTR_2_RW(in3_max, in, i_max, 3); |
461 | static SENSOR_DEVICE_ATTR_2_RW(in4_max, in, i_max, 4); |
462 | static SENSOR_DEVICE_ATTR_2_RW(in5_max, in, i_max, 5); |
463 | static SENSOR_DEVICE_ATTR_2_RW(in6_max, in, i_max, 6); |
464 | static SENSOR_DEVICE_ATTR_2_RO(in0_input, in, i_input, 0); |
465 | static SENSOR_DEVICE_ATTR_2_RO(in1_input, in, i_input, 1); |
466 | static SENSOR_DEVICE_ATTR_2_RO(in2_input, in, i_input, 2); |
467 | static SENSOR_DEVICE_ATTR_2_RO(in3_input, in, i_input, 3); |
468 | static SENSOR_DEVICE_ATTR_2_RO(in4_input, in, i_input, 4); |
469 | static SENSOR_DEVICE_ATTR_2_RO(in5_input, in, i_input, 5); |
470 | static SENSOR_DEVICE_ATTR_2_RO(in6_input, in, i_input, 6); |
471 | static SENSOR_DEVICE_ATTR_2_RW(fan1_min, fan, f_min, 0); |
472 | static SENSOR_DEVICE_ATTR_2_RW(fan2_min, fan, f_min, 1); |
473 | static SENSOR_DEVICE_ATTR_2_RO(fan1_input, fan, f_input, 0); |
474 | static SENSOR_DEVICE_ATTR_2_RO(fan2_input, fan, f_input, 1); |
475 | static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0); |
476 | static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1); |
477 | static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, t_input); |
478 | static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, t_hot_max); |
479 | static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, temp, t_hot_hyst); |
480 | static SENSOR_DEVICE_ATTR_RW(temp1_crit, temp, t_os_max); |
481 | static SENSOR_DEVICE_ATTR_RW(temp1_crit_hyst, temp, t_os_hyst); |
482 | static DEVICE_ATTR_RO(alarms); |
483 | static SENSOR_DEVICE_ATTR_RO(in0_alarm, alarm, 0); |
484 | static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 1); |
485 | static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 2); |
486 | static SENSOR_DEVICE_ATTR_RO(in3_alarm, alarm, 3); |
487 | static SENSOR_DEVICE_ATTR_RO(in4_alarm, alarm, 4); |
488 | static SENSOR_DEVICE_ATTR_RO(in5_alarm, alarm, 5); |
489 | static SENSOR_DEVICE_ATTR_RO(in6_alarm, alarm, 6); |
490 | static SENSOR_DEVICE_ATTR_RO(fan1_alarm, alarm, 10); |
491 | static SENSOR_DEVICE_ATTR_RO(fan2_alarm, alarm, 11); |
492 | static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 8); |
493 | static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 13); |
494 | |
495 | /* |
496 | * Real code |
497 | */ |
498 | |
499 | static struct attribute *lm80_attrs[] = { |
500 | &sensor_dev_attr_in0_min.dev_attr.attr, |
501 | &sensor_dev_attr_in1_min.dev_attr.attr, |
502 | &sensor_dev_attr_in2_min.dev_attr.attr, |
503 | &sensor_dev_attr_in3_min.dev_attr.attr, |
504 | &sensor_dev_attr_in4_min.dev_attr.attr, |
505 | &sensor_dev_attr_in5_min.dev_attr.attr, |
506 | &sensor_dev_attr_in6_min.dev_attr.attr, |
507 | &sensor_dev_attr_in0_max.dev_attr.attr, |
508 | &sensor_dev_attr_in1_max.dev_attr.attr, |
509 | &sensor_dev_attr_in2_max.dev_attr.attr, |
510 | &sensor_dev_attr_in3_max.dev_attr.attr, |
511 | &sensor_dev_attr_in4_max.dev_attr.attr, |
512 | &sensor_dev_attr_in5_max.dev_attr.attr, |
513 | &sensor_dev_attr_in6_max.dev_attr.attr, |
514 | &sensor_dev_attr_in0_input.dev_attr.attr, |
515 | &sensor_dev_attr_in1_input.dev_attr.attr, |
516 | &sensor_dev_attr_in2_input.dev_attr.attr, |
517 | &sensor_dev_attr_in3_input.dev_attr.attr, |
518 | &sensor_dev_attr_in4_input.dev_attr.attr, |
519 | &sensor_dev_attr_in5_input.dev_attr.attr, |
520 | &sensor_dev_attr_in6_input.dev_attr.attr, |
521 | &sensor_dev_attr_fan1_min.dev_attr.attr, |
522 | &sensor_dev_attr_fan2_min.dev_attr.attr, |
523 | &sensor_dev_attr_fan1_input.dev_attr.attr, |
524 | &sensor_dev_attr_fan2_input.dev_attr.attr, |
525 | &sensor_dev_attr_fan1_div.dev_attr.attr, |
526 | &sensor_dev_attr_fan2_div.dev_attr.attr, |
527 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
528 | &sensor_dev_attr_temp1_max.dev_attr.attr, |
529 | &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, |
530 | &sensor_dev_attr_temp1_crit.dev_attr.attr, |
531 | &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr, |
532 | &dev_attr_alarms.attr, |
533 | &sensor_dev_attr_in0_alarm.dev_attr.attr, |
534 | &sensor_dev_attr_in1_alarm.dev_attr.attr, |
535 | &sensor_dev_attr_in2_alarm.dev_attr.attr, |
536 | &sensor_dev_attr_in3_alarm.dev_attr.attr, |
537 | &sensor_dev_attr_in4_alarm.dev_attr.attr, |
538 | &sensor_dev_attr_in5_alarm.dev_attr.attr, |
539 | &sensor_dev_attr_in6_alarm.dev_attr.attr, |
540 | &sensor_dev_attr_fan1_alarm.dev_attr.attr, |
541 | &sensor_dev_attr_fan2_alarm.dev_attr.attr, |
542 | &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, |
543 | &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, |
544 | NULL |
545 | }; |
546 | ATTRIBUTE_GROUPS(lm80); |
547 | |
548 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
549 | static int lm80_detect(struct i2c_client *client, struct i2c_board_info *info) |
550 | { |
551 | struct i2c_adapter *adapter = client->adapter; |
552 | int i, cur, man_id, dev_id; |
553 | const char *name = NULL; |
554 | |
555 | if (!i2c_check_functionality(adap: adapter, I2C_FUNC_SMBUS_BYTE_DATA)) |
556 | return -ENODEV; |
557 | |
558 | /* First check for unused bits, common to both chip types */ |
559 | if ((lm80_read_value(client, LM80_REG_ALARM2) & 0xc0) |
560 | || (lm80_read_value(client, LM80_REG_CONFIG) & 0x80)) |
561 | return -ENODEV; |
562 | |
563 | /* |
564 | * The LM96080 has manufacturer and stepping/die rev registers so we |
565 | * can just check that. The LM80 does not have such registers so we |
566 | * have to use a more expensive trick. |
567 | */ |
568 | man_id = lm80_read_value(client, LM96080_REG_MAN_ID); |
569 | dev_id = lm80_read_value(client, LM96080_REG_DEV_ID); |
570 | if (man_id == 0x01 && dev_id == 0x08) { |
571 | /* Check more unused bits for confirmation */ |
572 | if (lm80_read_value(client, LM96080_REG_CONV_RATE) & 0xfe) |
573 | return -ENODEV; |
574 | |
575 | name = "lm96080" ; |
576 | } else { |
577 | /* Check 6-bit addressing */ |
578 | for (i = 0x2a; i <= 0x3d; i++) { |
579 | cur = i2c_smbus_read_byte_data(client, command: i); |
580 | if ((i2c_smbus_read_byte_data(client, command: i + 0x40) != cur) |
581 | || (i2c_smbus_read_byte_data(client, command: i + 0x80) != cur) |
582 | || (i2c_smbus_read_byte_data(client, command: i + 0xc0) != cur)) |
583 | return -ENODEV; |
584 | } |
585 | |
586 | name = "lm80" ; |
587 | } |
588 | |
589 | strscpy(p: info->type, q: name, I2C_NAME_SIZE); |
590 | |
591 | return 0; |
592 | } |
593 | |
594 | static int lm80_probe(struct i2c_client *client) |
595 | { |
596 | struct device *dev = &client->dev; |
597 | struct device *hwmon_dev; |
598 | struct lm80_data *data; |
599 | |
600 | data = devm_kzalloc(dev, size: sizeof(struct lm80_data), GFP_KERNEL); |
601 | if (!data) |
602 | return -ENOMEM; |
603 | |
604 | data->client = client; |
605 | mutex_init(&data->update_lock); |
606 | |
607 | /* Initialize the LM80 chip */ |
608 | lm80_init_client(client); |
609 | |
610 | /* A few vars need to be filled upon startup */ |
611 | data->fan[f_min][0] = lm80_read_value(client, LM80_REG_FAN_MIN(1)); |
612 | data->fan[f_min][1] = lm80_read_value(client, LM80_REG_FAN_MIN(2)); |
613 | |
614 | hwmon_dev = devm_hwmon_device_register_with_groups(dev, name: client->name, |
615 | drvdata: data, groups: lm80_groups); |
616 | |
617 | return PTR_ERR_OR_ZERO(ptr: hwmon_dev); |
618 | } |
619 | |
620 | /* |
621 | * Driver data (common to all clients) |
622 | */ |
623 | |
624 | static const struct i2c_device_id lm80_id[] = { |
625 | { "lm80" , 0 }, |
626 | { "lm96080" , 1 }, |
627 | { } |
628 | }; |
629 | MODULE_DEVICE_TABLE(i2c, lm80_id); |
630 | |
631 | static struct i2c_driver lm80_driver = { |
632 | .class = I2C_CLASS_HWMON, |
633 | .driver = { |
634 | .name = "lm80" , |
635 | }, |
636 | .probe = lm80_probe, |
637 | .id_table = lm80_id, |
638 | .detect = lm80_detect, |
639 | .address_list = normal_i2c, |
640 | }; |
641 | |
642 | module_i2c_driver(lm80_driver); |
643 | |
644 | MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and " |
645 | "Philip Edelbrock <phil@netroedge.com>" ); |
646 | MODULE_DESCRIPTION("LM80 driver" ); |
647 | MODULE_LICENSE("GPL" ); |
648 | |