1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * lm87.c |
4 | * |
5 | * Copyright (C) 2000 Frodo Looijaard <frodol@dds.nl> |
6 | * Philip Edelbrock <phil@netroedge.com> |
7 | * Stephen Rousset <stephen.rousset@rocketlogix.com> |
8 | * Dan Eaton <dan.eaton@rocketlogix.com> |
9 | * Copyright (C) 2004-2008 Jean Delvare <jdelvare@suse.de> |
10 | * |
11 | * Original port to Linux 2.6 by Jeff Oliver. |
12 | * |
13 | * The LM87 is a sensor chip made by National Semiconductor. It monitors up |
14 | * to 8 voltages (including its own power source), up to three temperatures |
15 | * (its own plus up to two external ones) and up to two fans. The default |
16 | * configuration is 6 voltages, two temperatures and two fans (see below). |
17 | * Voltages are scaled internally with ratios such that the nominal value of |
18 | * each voltage correspond to a register value of 192 (which means a |
19 | * resolution of about 0.5% of the nominal value). Temperature values are |
20 | * reported with a 1 deg resolution and a 3-4 deg accuracy. Complete |
21 | * datasheet can be obtained from National's website at: |
22 | * http://www.national.com/pf/LM/LM87.html |
23 | * |
24 | * Some functions share pins, so not all functions are available at the same |
25 | * time. Which are depends on the hardware setup. This driver normally |
26 | * assumes that firmware configured the chip correctly. Where this is not |
27 | * the case, platform code must set the I2C client's platform_data to point |
28 | * to a u8 value to be written to the channel register. |
29 | * For reference, here is the list of exclusive functions: |
30 | * - in0+in5 (default) or temp3 |
31 | * - fan1 (default) or in6 |
32 | * - fan2 (default) or in7 |
33 | * - VID lines (default) or IRQ lines (not handled by this driver) |
34 | * |
35 | * The LM87 additionally features an analog output, supposedly usable to |
36 | * control the speed of a fan. All new chips use pulse width modulation |
37 | * instead. The LM87 is the only hardware monitoring chipset I know of |
38 | * which uses amplitude modulation. Be careful when using this feature. |
39 | * |
40 | * This driver also supports the ADM1024, a sensor chip made by Analog |
41 | * Devices. That chip is fully compatible with the LM87. Complete |
42 | * datasheet can be obtained from Analog's website at: |
43 | * https://www.analog.com/en/prod/0,2877,ADM1024,00.html |
44 | */ |
45 | |
46 | #include <linux/module.h> |
47 | #include <linux/init.h> |
48 | #include <linux/slab.h> |
49 | #include <linux/jiffies.h> |
50 | #include <linux/i2c.h> |
51 | #include <linux/hwmon.h> |
52 | #include <linux/hwmon-sysfs.h> |
53 | #include <linux/hwmon-vid.h> |
54 | #include <linux/err.h> |
55 | #include <linux/mutex.h> |
56 | #include <linux/regulator/consumer.h> |
57 | |
58 | /* |
59 | * Addresses to scan |
60 | * LM87 has three possible addresses: 0x2c, 0x2d and 0x2e. |
61 | */ |
62 | |
63 | static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END }; |
64 | |
65 | /* |
66 | * The LM87 registers |
67 | */ |
68 | |
69 | /* nr in 0..5 */ |
70 | #define LM87_REG_IN(nr) (0x20 + (nr)) |
71 | #define LM87_REG_IN_MAX(nr) (0x2B + (nr) * 2) |
72 | #define LM87_REG_IN_MIN(nr) (0x2C + (nr) * 2) |
73 | /* nr in 0..1 */ |
74 | #define LM87_REG_AIN(nr) (0x28 + (nr)) |
75 | #define LM87_REG_AIN_MIN(nr) (0x1A + (nr)) |
76 | #define LM87_REG_AIN_MAX(nr) (0x3B + (nr)) |
77 | |
78 | static u8 LM87_REG_TEMP[3] = { 0x27, 0x26, 0x20 }; |
79 | static u8 LM87_REG_TEMP_HIGH[3] = { 0x39, 0x37, 0x2B }; |
80 | static u8 LM87_REG_TEMP_LOW[3] = { 0x3A, 0x38, 0x2C }; |
81 | |
82 | #define LM87_REG_TEMP_HW_INT_LOCK 0x13 |
83 | #define LM87_REG_TEMP_HW_EXT_LOCK 0x14 |
84 | #define LM87_REG_TEMP_HW_INT 0x17 |
85 | #define LM87_REG_TEMP_HW_EXT 0x18 |
86 | |
87 | /* nr in 0..1 */ |
88 | #define LM87_REG_FAN(nr) (0x28 + (nr)) |
89 | #define LM87_REG_FAN_MIN(nr) (0x3B + (nr)) |
90 | #define LM87_REG_AOUT 0x19 |
91 | |
92 | #define LM87_REG_CONFIG 0x40 |
93 | #define LM87_REG_CHANNEL_MODE 0x16 |
94 | #define LM87_REG_VID_FAN_DIV 0x47 |
95 | #define LM87_REG_VID4 0x49 |
96 | |
97 | #define LM87_REG_ALARMS1 0x41 |
98 | #define LM87_REG_ALARMS2 0x42 |
99 | |
100 | #define LM87_REG_COMPANY_ID 0x3E |
101 | #define LM87_REG_REVISION 0x3F |
102 | |
103 | /* |
104 | * Conversions and various macros |
105 | * The LM87 uses signed 8-bit values for temperatures. |
106 | */ |
107 | |
108 | #define IN_FROM_REG(reg, scale) (((reg) * (scale) + 96) / 192) |
109 | #define IN_TO_REG(val, scale) ((val) <= 0 ? 0 : \ |
110 | (val) >= (scale) * 255 / 192 ? 255 : \ |
111 | ((val) * 192 + (scale) / 2) / (scale)) |
112 | |
113 | #define TEMP_FROM_REG(reg) ((reg) * 1000) |
114 | #define TEMP_TO_REG(val) ((val) <= -127500 ? -128 : \ |
115 | (val) >= 126500 ? 127 : \ |
116 | (((val) < 0 ? (val) - 500 : \ |
117 | (val) + 500) / 1000)) |
118 | |
119 | #define FAN_FROM_REG(reg, div) ((reg) == 255 || (reg) == 0 ? 0 : \ |
120 | (1350000 + (reg)*(div) / 2) / ((reg) * (div))) |
121 | #define FAN_TO_REG(val, div) ((val) * (div) * 255 <= 1350000 ? 255 : \ |
122 | (1350000 + (val)*(div) / 2) / ((val) * (div))) |
123 | |
124 | #define FAN_DIV_FROM_REG(reg) (1 << (reg)) |
125 | |
126 | /* analog out is 9.80mV/LSB */ |
127 | #define AOUT_FROM_REG(reg) (((reg) * 98 + 5) / 10) |
128 | #define AOUT_TO_REG(val) ((val) <= 0 ? 0 : \ |
129 | (val) >= 2500 ? 255 : \ |
130 | ((val) * 10 + 49) / 98) |
131 | |
132 | /* nr in 0..1 */ |
133 | #define CHAN_NO_FAN(nr) (1 << (nr)) |
134 | #define CHAN_TEMP3 (1 << 2) |
135 | #define CHAN_VCC_5V (1 << 3) |
136 | #define CHAN_NO_VID (1 << 7) |
137 | |
138 | /* |
139 | * Client data (each client gets its own) |
140 | */ |
141 | |
142 | struct lm87_data { |
143 | struct mutex update_lock; |
144 | bool valid; /* false until following fields are valid */ |
145 | unsigned long last_updated; /* In jiffies */ |
146 | |
147 | u8 channel; /* register value */ |
148 | u8 config; /* original register value */ |
149 | |
150 | u8 in[8]; /* register value */ |
151 | u8 in_max[8]; /* register value */ |
152 | u8 in_min[8]; /* register value */ |
153 | u16 in_scale[8]; |
154 | |
155 | s8 temp[3]; /* register value */ |
156 | s8 temp_high[3]; /* register value */ |
157 | s8 temp_low[3]; /* register value */ |
158 | s8 temp_crit_int; /* min of two register values */ |
159 | s8 temp_crit_ext; /* min of two register values */ |
160 | |
161 | u8 fan[2]; /* register value */ |
162 | u8 fan_min[2]; /* register value */ |
163 | u8 fan_div[2]; /* register value, shifted right */ |
164 | u8 aout; /* register value */ |
165 | |
166 | u16 alarms; /* register values, combined */ |
167 | u8 vid; /* register values, combined */ |
168 | u8 vrm; |
169 | |
170 | const struct attribute_group *attr_groups[6]; |
171 | }; |
172 | |
173 | static inline int lm87_read_value(struct i2c_client *client, u8 reg) |
174 | { |
175 | return i2c_smbus_read_byte_data(client, command: reg); |
176 | } |
177 | |
178 | static inline int lm87_write_value(struct i2c_client *client, u8 reg, u8 value) |
179 | { |
180 | return i2c_smbus_write_byte_data(client, command: reg, value); |
181 | } |
182 | |
183 | static struct lm87_data *lm87_update_device(struct device *dev) |
184 | { |
185 | struct i2c_client *client = dev_get_drvdata(dev); |
186 | struct lm87_data *data = i2c_get_clientdata(client); |
187 | |
188 | mutex_lock(&data->update_lock); |
189 | |
190 | if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { |
191 | int i, j; |
192 | |
193 | dev_dbg(&client->dev, "Updating data.\n" ); |
194 | |
195 | i = (data->channel & CHAN_TEMP3) ? 1 : 0; |
196 | j = (data->channel & CHAN_TEMP3) ? 5 : 6; |
197 | for (; i < j; i++) { |
198 | data->in[i] = lm87_read_value(client, |
199 | LM87_REG_IN(i)); |
200 | data->in_min[i] = lm87_read_value(client, |
201 | LM87_REG_IN_MIN(i)); |
202 | data->in_max[i] = lm87_read_value(client, |
203 | LM87_REG_IN_MAX(i)); |
204 | } |
205 | |
206 | for (i = 0; i < 2; i++) { |
207 | if (data->channel & CHAN_NO_FAN(i)) { |
208 | data->in[6+i] = lm87_read_value(client, |
209 | LM87_REG_AIN(i)); |
210 | data->in_max[6+i] = lm87_read_value(client, |
211 | LM87_REG_AIN_MAX(i)); |
212 | data->in_min[6+i] = lm87_read_value(client, |
213 | LM87_REG_AIN_MIN(i)); |
214 | |
215 | } else { |
216 | data->fan[i] = lm87_read_value(client, |
217 | LM87_REG_FAN(i)); |
218 | data->fan_min[i] = lm87_read_value(client, |
219 | LM87_REG_FAN_MIN(i)); |
220 | } |
221 | } |
222 | |
223 | j = (data->channel & CHAN_TEMP3) ? 3 : 2; |
224 | for (i = 0 ; i < j; i++) { |
225 | data->temp[i] = lm87_read_value(client, |
226 | reg: LM87_REG_TEMP[i]); |
227 | data->temp_high[i] = lm87_read_value(client, |
228 | reg: LM87_REG_TEMP_HIGH[i]); |
229 | data->temp_low[i] = lm87_read_value(client, |
230 | reg: LM87_REG_TEMP_LOW[i]); |
231 | } |
232 | |
233 | i = lm87_read_value(client, LM87_REG_TEMP_HW_INT_LOCK); |
234 | j = lm87_read_value(client, LM87_REG_TEMP_HW_INT); |
235 | data->temp_crit_int = min(i, j); |
236 | |
237 | i = lm87_read_value(client, LM87_REG_TEMP_HW_EXT_LOCK); |
238 | j = lm87_read_value(client, LM87_REG_TEMP_HW_EXT); |
239 | data->temp_crit_ext = min(i, j); |
240 | |
241 | i = lm87_read_value(client, LM87_REG_VID_FAN_DIV); |
242 | data->fan_div[0] = (i >> 4) & 0x03; |
243 | data->fan_div[1] = (i >> 6) & 0x03; |
244 | data->vid = (i & 0x0F) |
245 | | (lm87_read_value(client, LM87_REG_VID4) & 0x01) |
246 | << 4; |
247 | |
248 | data->alarms = lm87_read_value(client, LM87_REG_ALARMS1) |
249 | | (lm87_read_value(client, LM87_REG_ALARMS2) |
250 | << 8); |
251 | data->aout = lm87_read_value(client, LM87_REG_AOUT); |
252 | |
253 | data->last_updated = jiffies; |
254 | data->valid = true; |
255 | } |
256 | |
257 | mutex_unlock(lock: &data->update_lock); |
258 | |
259 | return data; |
260 | } |
261 | |
262 | /* |
263 | * Sysfs stuff |
264 | */ |
265 | |
266 | static ssize_t in_input_show(struct device *dev, |
267 | struct device_attribute *attr, char *buf) |
268 | { |
269 | struct lm87_data *data = lm87_update_device(dev); |
270 | int nr = to_sensor_dev_attr(attr)->index; |
271 | |
272 | return sprintf(buf, fmt: "%u\n" , IN_FROM_REG(data->in[nr], |
273 | data->in_scale[nr])); |
274 | } |
275 | |
276 | static ssize_t in_min_show(struct device *dev, struct device_attribute *attr, |
277 | char *buf) |
278 | { |
279 | struct lm87_data *data = lm87_update_device(dev); |
280 | int nr = to_sensor_dev_attr(attr)->index; |
281 | |
282 | return sprintf(buf, fmt: "%u\n" , IN_FROM_REG(data->in_min[nr], |
283 | data->in_scale[nr])); |
284 | } |
285 | |
286 | static ssize_t in_max_show(struct device *dev, struct device_attribute *attr, |
287 | char *buf) |
288 | { |
289 | struct lm87_data *data = lm87_update_device(dev); |
290 | int nr = to_sensor_dev_attr(attr)->index; |
291 | |
292 | return sprintf(buf, fmt: "%u\n" , IN_FROM_REG(data->in_max[nr], |
293 | data->in_scale[nr])); |
294 | } |
295 | |
296 | static ssize_t in_min_store(struct device *dev, struct device_attribute *attr, |
297 | const char *buf, size_t count) |
298 | { |
299 | struct i2c_client *client = dev_get_drvdata(dev); |
300 | struct lm87_data *data = i2c_get_clientdata(client); |
301 | int nr = to_sensor_dev_attr(attr)->index; |
302 | long val; |
303 | int err; |
304 | |
305 | err = kstrtol(s: buf, base: 10, res: &val); |
306 | if (err) |
307 | return err; |
308 | |
309 | mutex_lock(&data->update_lock); |
310 | data->in_min[nr] = IN_TO_REG(val, data->in_scale[nr]); |
311 | lm87_write_value(client, reg: nr < 6 ? LM87_REG_IN_MIN(nr) : |
312 | LM87_REG_AIN_MIN(nr - 6), value: data->in_min[nr]); |
313 | mutex_unlock(lock: &data->update_lock); |
314 | return count; |
315 | } |
316 | |
317 | static ssize_t in_max_store(struct device *dev, struct device_attribute *attr, |
318 | const char *buf, size_t count) |
319 | { |
320 | struct i2c_client *client = dev_get_drvdata(dev); |
321 | struct lm87_data *data = i2c_get_clientdata(client); |
322 | int nr = to_sensor_dev_attr(attr)->index; |
323 | long val; |
324 | int err; |
325 | |
326 | err = kstrtol(s: buf, base: 10, res: &val); |
327 | if (err) |
328 | return err; |
329 | |
330 | mutex_lock(&data->update_lock); |
331 | data->in_max[nr] = IN_TO_REG(val, data->in_scale[nr]); |
332 | lm87_write_value(client, reg: nr < 6 ? LM87_REG_IN_MAX(nr) : |
333 | LM87_REG_AIN_MAX(nr - 6), value: data->in_max[nr]); |
334 | mutex_unlock(lock: &data->update_lock); |
335 | return count; |
336 | } |
337 | |
338 | static SENSOR_DEVICE_ATTR_RO(in0_input, in_input, 0); |
339 | static SENSOR_DEVICE_ATTR_RW(in0_min, in_min, 0); |
340 | static SENSOR_DEVICE_ATTR_RW(in0_max, in_max, 0); |
341 | static SENSOR_DEVICE_ATTR_RO(in1_input, in_input, 1); |
342 | static SENSOR_DEVICE_ATTR_RW(in1_min, in_min, 1); |
343 | static SENSOR_DEVICE_ATTR_RW(in1_max, in_max, 1); |
344 | static SENSOR_DEVICE_ATTR_RO(in2_input, in_input, 2); |
345 | static SENSOR_DEVICE_ATTR_RW(in2_min, in_min, 2); |
346 | static SENSOR_DEVICE_ATTR_RW(in2_max, in_max, 2); |
347 | static SENSOR_DEVICE_ATTR_RO(in3_input, in_input, 3); |
348 | static SENSOR_DEVICE_ATTR_RW(in3_min, in_min, 3); |
349 | static SENSOR_DEVICE_ATTR_RW(in3_max, in_max, 3); |
350 | static SENSOR_DEVICE_ATTR_RO(in4_input, in_input, 4); |
351 | static SENSOR_DEVICE_ATTR_RW(in4_min, in_min, 4); |
352 | static SENSOR_DEVICE_ATTR_RW(in4_max, in_max, 4); |
353 | static SENSOR_DEVICE_ATTR_RO(in5_input, in_input, 5); |
354 | static SENSOR_DEVICE_ATTR_RW(in5_min, in_min, 5); |
355 | static SENSOR_DEVICE_ATTR_RW(in5_max, in_max, 5); |
356 | static SENSOR_DEVICE_ATTR_RO(in6_input, in_input, 6); |
357 | static SENSOR_DEVICE_ATTR_RW(in6_min, in_min, 6); |
358 | static SENSOR_DEVICE_ATTR_RW(in6_max, in_max, 6); |
359 | static SENSOR_DEVICE_ATTR_RO(in7_input, in_input, 7); |
360 | static SENSOR_DEVICE_ATTR_RW(in7_min, in_min, 7); |
361 | static SENSOR_DEVICE_ATTR_RW(in7_max, in_max, 7); |
362 | |
363 | static ssize_t temp_input_show(struct device *dev, |
364 | struct device_attribute *attr, char *buf) |
365 | { |
366 | struct lm87_data *data = lm87_update_device(dev); |
367 | int nr = to_sensor_dev_attr(attr)->index; |
368 | |
369 | return sprintf(buf, fmt: "%d\n" , TEMP_FROM_REG(data->temp[nr])); |
370 | } |
371 | |
372 | static ssize_t temp_low_show(struct device *dev, |
373 | struct device_attribute *attr, char *buf) |
374 | { |
375 | struct lm87_data *data = lm87_update_device(dev); |
376 | int nr = to_sensor_dev_attr(attr)->index; |
377 | |
378 | return sprintf(buf, fmt: "%d\n" , |
379 | TEMP_FROM_REG(data->temp_low[nr])); |
380 | } |
381 | |
382 | static ssize_t temp_high_show(struct device *dev, |
383 | struct device_attribute *attr, char *buf) |
384 | { |
385 | struct lm87_data *data = lm87_update_device(dev); |
386 | int nr = to_sensor_dev_attr(attr)->index; |
387 | |
388 | return sprintf(buf, fmt: "%d\n" , |
389 | TEMP_FROM_REG(data->temp_high[nr])); |
390 | } |
391 | |
392 | static ssize_t temp_low_store(struct device *dev, |
393 | struct device_attribute *attr, const char *buf, |
394 | size_t count) |
395 | { |
396 | struct i2c_client *client = dev_get_drvdata(dev); |
397 | struct lm87_data *data = i2c_get_clientdata(client); |
398 | int nr = to_sensor_dev_attr(attr)->index; |
399 | long val; |
400 | int err; |
401 | |
402 | err = kstrtol(s: buf, base: 10, res: &val); |
403 | if (err) |
404 | return err; |
405 | |
406 | mutex_lock(&data->update_lock); |
407 | data->temp_low[nr] = TEMP_TO_REG(val); |
408 | lm87_write_value(client, reg: LM87_REG_TEMP_LOW[nr], value: data->temp_low[nr]); |
409 | mutex_unlock(lock: &data->update_lock); |
410 | return count; |
411 | } |
412 | |
413 | static ssize_t temp_high_store(struct device *dev, |
414 | struct device_attribute *attr, const char *buf, |
415 | size_t count) |
416 | { |
417 | struct i2c_client *client = dev_get_drvdata(dev); |
418 | struct lm87_data *data = i2c_get_clientdata(client); |
419 | int nr = to_sensor_dev_attr(attr)->index; |
420 | long val; |
421 | int err; |
422 | |
423 | err = kstrtol(s: buf, base: 10, res: &val); |
424 | if (err) |
425 | return err; |
426 | |
427 | mutex_lock(&data->update_lock); |
428 | data->temp_high[nr] = TEMP_TO_REG(val); |
429 | lm87_write_value(client, reg: LM87_REG_TEMP_HIGH[nr], value: data->temp_high[nr]); |
430 | mutex_unlock(lock: &data->update_lock); |
431 | return count; |
432 | } |
433 | |
434 | static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0); |
435 | static SENSOR_DEVICE_ATTR_RW(temp1_min, temp_low, 0); |
436 | static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_high, 0); |
437 | static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1); |
438 | static SENSOR_DEVICE_ATTR_RW(temp2_min, temp_low, 1); |
439 | static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_high, 1); |
440 | static SENSOR_DEVICE_ATTR_RO(temp3_input, temp_input, 2); |
441 | static SENSOR_DEVICE_ATTR_RW(temp3_min, temp_low, 2); |
442 | static SENSOR_DEVICE_ATTR_RW(temp3_max, temp_high, 2); |
443 | |
444 | static ssize_t temp1_crit_show(struct device *dev, |
445 | struct device_attribute *attr, char *buf) |
446 | { |
447 | struct lm87_data *data = lm87_update_device(dev); |
448 | return sprintf(buf, fmt: "%d\n" , TEMP_FROM_REG(data->temp_crit_int)); |
449 | } |
450 | |
451 | static ssize_t temp2_crit_show(struct device *dev, |
452 | struct device_attribute *attr, char *buf) |
453 | { |
454 | struct lm87_data *data = lm87_update_device(dev); |
455 | return sprintf(buf, fmt: "%d\n" , TEMP_FROM_REG(data->temp_crit_ext)); |
456 | } |
457 | |
458 | static DEVICE_ATTR_RO(temp1_crit); |
459 | static DEVICE_ATTR_RO(temp2_crit); |
460 | static DEVICE_ATTR(temp3_crit, 0444, temp2_crit_show, NULL); |
461 | |
462 | static ssize_t fan_input_show(struct device *dev, |
463 | struct device_attribute *attr, char *buf) |
464 | { |
465 | struct lm87_data *data = lm87_update_device(dev); |
466 | int nr = to_sensor_dev_attr(attr)->index; |
467 | |
468 | return sprintf(buf, fmt: "%d\n" , FAN_FROM_REG(data->fan[nr], |
469 | FAN_DIV_FROM_REG(data->fan_div[nr]))); |
470 | } |
471 | |
472 | static ssize_t fan_min_show(struct device *dev, struct device_attribute *attr, |
473 | char *buf) |
474 | { |
475 | struct lm87_data *data = lm87_update_device(dev); |
476 | int nr = to_sensor_dev_attr(attr)->index; |
477 | |
478 | return sprintf(buf, fmt: "%d\n" , FAN_FROM_REG(data->fan_min[nr], |
479 | FAN_DIV_FROM_REG(data->fan_div[nr]))); |
480 | } |
481 | |
482 | static ssize_t fan_div_show(struct device *dev, struct device_attribute *attr, |
483 | char *buf) |
484 | { |
485 | struct lm87_data *data = lm87_update_device(dev); |
486 | int nr = to_sensor_dev_attr(attr)->index; |
487 | |
488 | return sprintf(buf, fmt: "%d\n" , |
489 | FAN_DIV_FROM_REG(data->fan_div[nr])); |
490 | } |
491 | |
492 | static ssize_t fan_min_store(struct device *dev, |
493 | struct device_attribute *attr, const char *buf, |
494 | size_t count) |
495 | { |
496 | struct i2c_client *client = dev_get_drvdata(dev); |
497 | struct lm87_data *data = i2c_get_clientdata(client); |
498 | int nr = to_sensor_dev_attr(attr)->index; |
499 | long val; |
500 | int err; |
501 | |
502 | err = kstrtol(s: buf, base: 10, res: &val); |
503 | if (err) |
504 | return err; |
505 | |
506 | mutex_lock(&data->update_lock); |
507 | data->fan_min[nr] = FAN_TO_REG(val, |
508 | FAN_DIV_FROM_REG(data->fan_div[nr])); |
509 | lm87_write_value(client, LM87_REG_FAN_MIN(nr), value: data->fan_min[nr]); |
510 | mutex_unlock(lock: &data->update_lock); |
511 | return count; |
512 | } |
513 | |
514 | /* |
515 | * Note: we save and restore the fan minimum here, because its value is |
516 | * determined in part by the fan clock divider. This follows the principle |
517 | * of least surprise; the user doesn't expect the fan minimum to change just |
518 | * because the divider changed. |
519 | */ |
520 | static ssize_t fan_div_store(struct device *dev, |
521 | struct device_attribute *attr, const char *buf, |
522 | size_t count) |
523 | { |
524 | struct i2c_client *client = dev_get_drvdata(dev); |
525 | struct lm87_data *data = i2c_get_clientdata(client); |
526 | int nr = to_sensor_dev_attr(attr)->index; |
527 | long val; |
528 | int err; |
529 | unsigned long min; |
530 | u8 reg; |
531 | |
532 | err = kstrtol(s: buf, base: 10, res: &val); |
533 | if (err) |
534 | return err; |
535 | |
536 | mutex_lock(&data->update_lock); |
537 | min = FAN_FROM_REG(data->fan_min[nr], |
538 | FAN_DIV_FROM_REG(data->fan_div[nr])); |
539 | |
540 | switch (val) { |
541 | case 1: |
542 | data->fan_div[nr] = 0; |
543 | break; |
544 | case 2: |
545 | data->fan_div[nr] = 1; |
546 | break; |
547 | case 4: |
548 | data->fan_div[nr] = 2; |
549 | break; |
550 | case 8: |
551 | data->fan_div[nr] = 3; |
552 | break; |
553 | default: |
554 | mutex_unlock(lock: &data->update_lock); |
555 | return -EINVAL; |
556 | } |
557 | |
558 | reg = lm87_read_value(client, LM87_REG_VID_FAN_DIV); |
559 | switch (nr) { |
560 | case 0: |
561 | reg = (reg & 0xCF) | (data->fan_div[0] << 4); |
562 | break; |
563 | case 1: |
564 | reg = (reg & 0x3F) | (data->fan_div[1] << 6); |
565 | break; |
566 | } |
567 | lm87_write_value(client, LM87_REG_VID_FAN_DIV, value: reg); |
568 | |
569 | data->fan_min[nr] = FAN_TO_REG(min, val); |
570 | lm87_write_value(client, LM87_REG_FAN_MIN(nr), |
571 | value: data->fan_min[nr]); |
572 | mutex_unlock(lock: &data->update_lock); |
573 | |
574 | return count; |
575 | } |
576 | |
577 | static SENSOR_DEVICE_ATTR_RO(fan1_input, fan_input, 0); |
578 | static SENSOR_DEVICE_ATTR_RW(fan1_min, fan_min, 0); |
579 | static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0); |
580 | static SENSOR_DEVICE_ATTR_RO(fan2_input, fan_input, 1); |
581 | static SENSOR_DEVICE_ATTR_RW(fan2_min, fan_min, 1); |
582 | static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1); |
583 | |
584 | static ssize_t alarms_show(struct device *dev, struct device_attribute *attr, |
585 | char *buf) |
586 | { |
587 | struct lm87_data *data = lm87_update_device(dev); |
588 | return sprintf(buf, fmt: "%d\n" , data->alarms); |
589 | } |
590 | static DEVICE_ATTR_RO(alarms); |
591 | |
592 | static ssize_t cpu0_vid_show(struct device *dev, |
593 | struct device_attribute *attr, char *buf) |
594 | { |
595 | struct lm87_data *data = lm87_update_device(dev); |
596 | return sprintf(buf, fmt: "%d\n" , vid_from_reg(val: data->vid, vrm: data->vrm)); |
597 | } |
598 | static DEVICE_ATTR_RO(cpu0_vid); |
599 | |
600 | static ssize_t vrm_show(struct device *dev, struct device_attribute *attr, |
601 | char *buf) |
602 | { |
603 | struct lm87_data *data = dev_get_drvdata(dev); |
604 | return sprintf(buf, fmt: "%d\n" , data->vrm); |
605 | } |
606 | static ssize_t vrm_store(struct device *dev, struct device_attribute *attr, |
607 | const char *buf, size_t count) |
608 | { |
609 | struct lm87_data *data = dev_get_drvdata(dev); |
610 | unsigned long val; |
611 | int err; |
612 | |
613 | err = kstrtoul(s: buf, base: 10, res: &val); |
614 | if (err) |
615 | return err; |
616 | |
617 | if (val > 255) |
618 | return -EINVAL; |
619 | |
620 | data->vrm = val; |
621 | return count; |
622 | } |
623 | static DEVICE_ATTR_RW(vrm); |
624 | |
625 | static ssize_t aout_output_show(struct device *dev, |
626 | struct device_attribute *attr, char *buf) |
627 | { |
628 | struct lm87_data *data = lm87_update_device(dev); |
629 | return sprintf(buf, fmt: "%d\n" , AOUT_FROM_REG(data->aout)); |
630 | } |
631 | static ssize_t aout_output_store(struct device *dev, |
632 | struct device_attribute *attr, |
633 | const char *buf, size_t count) |
634 | { |
635 | struct i2c_client *client = dev_get_drvdata(dev); |
636 | struct lm87_data *data = i2c_get_clientdata(client); |
637 | long val; |
638 | int err; |
639 | |
640 | err = kstrtol(s: buf, base: 10, res: &val); |
641 | if (err) |
642 | return err; |
643 | |
644 | mutex_lock(&data->update_lock); |
645 | data->aout = AOUT_TO_REG(val); |
646 | lm87_write_value(client, LM87_REG_AOUT, value: data->aout); |
647 | mutex_unlock(lock: &data->update_lock); |
648 | return count; |
649 | } |
650 | static DEVICE_ATTR_RW(aout_output); |
651 | |
652 | static ssize_t alarm_show(struct device *dev, struct device_attribute *attr, |
653 | char *buf) |
654 | { |
655 | struct lm87_data *data = lm87_update_device(dev); |
656 | int bitnr = to_sensor_dev_attr(attr)->index; |
657 | return sprintf(buf, fmt: "%u\n" , (data->alarms >> bitnr) & 1); |
658 | } |
659 | static SENSOR_DEVICE_ATTR_RO(in0_alarm, alarm, 0); |
660 | static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 1); |
661 | static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 2); |
662 | static SENSOR_DEVICE_ATTR_RO(in3_alarm, alarm, 3); |
663 | static SENSOR_DEVICE_ATTR_RO(in4_alarm, alarm, 8); |
664 | static SENSOR_DEVICE_ATTR_RO(in5_alarm, alarm, 9); |
665 | static SENSOR_DEVICE_ATTR_RO(in6_alarm, alarm, 6); |
666 | static SENSOR_DEVICE_ATTR_RO(in7_alarm, alarm, 7); |
667 | static SENSOR_DEVICE_ATTR_RO(temp1_alarm, alarm, 4); |
668 | static SENSOR_DEVICE_ATTR_RO(temp2_alarm, alarm, 5); |
669 | static SENSOR_DEVICE_ATTR_RO(temp3_alarm, alarm, 5); |
670 | static SENSOR_DEVICE_ATTR_RO(fan1_alarm, alarm, 6); |
671 | static SENSOR_DEVICE_ATTR_RO(fan2_alarm, alarm, 7); |
672 | static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 14); |
673 | static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 15); |
674 | |
675 | /* |
676 | * Real code |
677 | */ |
678 | |
679 | static struct attribute *lm87_attributes[] = { |
680 | &sensor_dev_attr_in1_input.dev_attr.attr, |
681 | &sensor_dev_attr_in1_min.dev_attr.attr, |
682 | &sensor_dev_attr_in1_max.dev_attr.attr, |
683 | &sensor_dev_attr_in1_alarm.dev_attr.attr, |
684 | &sensor_dev_attr_in2_input.dev_attr.attr, |
685 | &sensor_dev_attr_in2_min.dev_attr.attr, |
686 | &sensor_dev_attr_in2_max.dev_attr.attr, |
687 | &sensor_dev_attr_in2_alarm.dev_attr.attr, |
688 | &sensor_dev_attr_in3_input.dev_attr.attr, |
689 | &sensor_dev_attr_in3_min.dev_attr.attr, |
690 | &sensor_dev_attr_in3_max.dev_attr.attr, |
691 | &sensor_dev_attr_in3_alarm.dev_attr.attr, |
692 | &sensor_dev_attr_in4_input.dev_attr.attr, |
693 | &sensor_dev_attr_in4_min.dev_attr.attr, |
694 | &sensor_dev_attr_in4_max.dev_attr.attr, |
695 | &sensor_dev_attr_in4_alarm.dev_attr.attr, |
696 | |
697 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
698 | &sensor_dev_attr_temp1_max.dev_attr.attr, |
699 | &sensor_dev_attr_temp1_min.dev_attr.attr, |
700 | &dev_attr_temp1_crit.attr, |
701 | &sensor_dev_attr_temp1_alarm.dev_attr.attr, |
702 | &sensor_dev_attr_temp2_input.dev_attr.attr, |
703 | &sensor_dev_attr_temp2_max.dev_attr.attr, |
704 | &sensor_dev_attr_temp2_min.dev_attr.attr, |
705 | &dev_attr_temp2_crit.attr, |
706 | &sensor_dev_attr_temp2_alarm.dev_attr.attr, |
707 | &sensor_dev_attr_temp2_fault.dev_attr.attr, |
708 | |
709 | &dev_attr_alarms.attr, |
710 | &dev_attr_aout_output.attr, |
711 | |
712 | NULL |
713 | }; |
714 | |
715 | static const struct attribute_group lm87_group = { |
716 | .attrs = lm87_attributes, |
717 | }; |
718 | |
719 | static struct attribute *lm87_attributes_in6[] = { |
720 | &sensor_dev_attr_in6_input.dev_attr.attr, |
721 | &sensor_dev_attr_in6_min.dev_attr.attr, |
722 | &sensor_dev_attr_in6_max.dev_attr.attr, |
723 | &sensor_dev_attr_in6_alarm.dev_attr.attr, |
724 | NULL |
725 | }; |
726 | |
727 | static const struct attribute_group lm87_group_in6 = { |
728 | .attrs = lm87_attributes_in6, |
729 | }; |
730 | |
731 | static struct attribute *lm87_attributes_fan1[] = { |
732 | &sensor_dev_attr_fan1_input.dev_attr.attr, |
733 | &sensor_dev_attr_fan1_min.dev_attr.attr, |
734 | &sensor_dev_attr_fan1_div.dev_attr.attr, |
735 | &sensor_dev_attr_fan1_alarm.dev_attr.attr, |
736 | NULL |
737 | }; |
738 | |
739 | static const struct attribute_group lm87_group_fan1 = { |
740 | .attrs = lm87_attributes_fan1, |
741 | }; |
742 | |
743 | static struct attribute *lm87_attributes_in7[] = { |
744 | &sensor_dev_attr_in7_input.dev_attr.attr, |
745 | &sensor_dev_attr_in7_min.dev_attr.attr, |
746 | &sensor_dev_attr_in7_max.dev_attr.attr, |
747 | &sensor_dev_attr_in7_alarm.dev_attr.attr, |
748 | NULL |
749 | }; |
750 | |
751 | static const struct attribute_group lm87_group_in7 = { |
752 | .attrs = lm87_attributes_in7, |
753 | }; |
754 | |
755 | static struct attribute *lm87_attributes_fan2[] = { |
756 | &sensor_dev_attr_fan2_input.dev_attr.attr, |
757 | &sensor_dev_attr_fan2_min.dev_attr.attr, |
758 | &sensor_dev_attr_fan2_div.dev_attr.attr, |
759 | &sensor_dev_attr_fan2_alarm.dev_attr.attr, |
760 | NULL |
761 | }; |
762 | |
763 | static const struct attribute_group lm87_group_fan2 = { |
764 | .attrs = lm87_attributes_fan2, |
765 | }; |
766 | |
767 | static struct attribute *lm87_attributes_temp3[] = { |
768 | &sensor_dev_attr_temp3_input.dev_attr.attr, |
769 | &sensor_dev_attr_temp3_max.dev_attr.attr, |
770 | &sensor_dev_attr_temp3_min.dev_attr.attr, |
771 | &dev_attr_temp3_crit.attr, |
772 | &sensor_dev_attr_temp3_alarm.dev_attr.attr, |
773 | &sensor_dev_attr_temp3_fault.dev_attr.attr, |
774 | NULL |
775 | }; |
776 | |
777 | static const struct attribute_group lm87_group_temp3 = { |
778 | .attrs = lm87_attributes_temp3, |
779 | }; |
780 | |
781 | static struct attribute *lm87_attributes_in0_5[] = { |
782 | &sensor_dev_attr_in0_input.dev_attr.attr, |
783 | &sensor_dev_attr_in0_min.dev_attr.attr, |
784 | &sensor_dev_attr_in0_max.dev_attr.attr, |
785 | &sensor_dev_attr_in0_alarm.dev_attr.attr, |
786 | &sensor_dev_attr_in5_input.dev_attr.attr, |
787 | &sensor_dev_attr_in5_min.dev_attr.attr, |
788 | &sensor_dev_attr_in5_max.dev_attr.attr, |
789 | &sensor_dev_attr_in5_alarm.dev_attr.attr, |
790 | NULL |
791 | }; |
792 | |
793 | static const struct attribute_group lm87_group_in0_5 = { |
794 | .attrs = lm87_attributes_in0_5, |
795 | }; |
796 | |
797 | static struct attribute *lm87_attributes_vid[] = { |
798 | &dev_attr_cpu0_vid.attr, |
799 | &dev_attr_vrm.attr, |
800 | NULL |
801 | }; |
802 | |
803 | static const struct attribute_group lm87_group_vid = { |
804 | .attrs = lm87_attributes_vid, |
805 | }; |
806 | |
807 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
808 | static int lm87_detect(struct i2c_client *client, struct i2c_board_info *info) |
809 | { |
810 | struct i2c_adapter *adapter = client->adapter; |
811 | const char *name; |
812 | u8 cid, rev; |
813 | |
814 | if (!i2c_check_functionality(adap: adapter, I2C_FUNC_SMBUS_BYTE_DATA)) |
815 | return -ENODEV; |
816 | |
817 | if (lm87_read_value(client, LM87_REG_CONFIG) & 0x80) |
818 | return -ENODEV; |
819 | |
820 | /* Now, we do the remaining detection. */ |
821 | cid = lm87_read_value(client, LM87_REG_COMPANY_ID); |
822 | rev = lm87_read_value(client, LM87_REG_REVISION); |
823 | |
824 | if (cid == 0x02 /* National Semiconductor */ |
825 | && (rev >= 0x01 && rev <= 0x08)) |
826 | name = "lm87" ; |
827 | else if (cid == 0x41 /* Analog Devices */ |
828 | && (rev & 0xf0) == 0x10) |
829 | name = "adm1024" ; |
830 | else { |
831 | dev_dbg(&adapter->dev, "LM87 detection failed at 0x%02x\n" , |
832 | client->addr); |
833 | return -ENODEV; |
834 | } |
835 | |
836 | strscpy(p: info->type, q: name, I2C_NAME_SIZE); |
837 | |
838 | return 0; |
839 | } |
840 | |
841 | static void lm87_restore_config(void *arg) |
842 | { |
843 | struct i2c_client *client = arg; |
844 | struct lm87_data *data = i2c_get_clientdata(client); |
845 | |
846 | lm87_write_value(client, LM87_REG_CONFIG, value: data->config); |
847 | } |
848 | |
849 | static int lm87_init_client(struct i2c_client *client) |
850 | { |
851 | struct lm87_data *data = i2c_get_clientdata(client); |
852 | int rc; |
853 | struct device_node *of_node = client->dev.of_node; |
854 | u8 val = 0; |
855 | struct regulator *vcc = NULL; |
856 | |
857 | if (of_node) { |
858 | if (of_property_read_bool(np: of_node, propname: "has-temp3" )) |
859 | val |= CHAN_TEMP3; |
860 | if (of_property_read_bool(np: of_node, propname: "has-in6" )) |
861 | val |= CHAN_NO_FAN(0); |
862 | if (of_property_read_bool(np: of_node, propname: "has-in7" )) |
863 | val |= CHAN_NO_FAN(1); |
864 | vcc = devm_regulator_get_optional(dev: &client->dev, id: "vcc" ); |
865 | if (!IS_ERR(ptr: vcc)) { |
866 | if (regulator_get_voltage(regulator: vcc) == 5000000) |
867 | val |= CHAN_VCC_5V; |
868 | } |
869 | data->channel = val; |
870 | lm87_write_value(client, |
871 | LM87_REG_CHANNEL_MODE, value: data->channel); |
872 | } else if (dev_get_platdata(dev: &client->dev)) { |
873 | data->channel = *(u8 *)dev_get_platdata(dev: &client->dev); |
874 | lm87_write_value(client, |
875 | LM87_REG_CHANNEL_MODE, value: data->channel); |
876 | } else { |
877 | data->channel = lm87_read_value(client, LM87_REG_CHANNEL_MODE); |
878 | } |
879 | data->config = lm87_read_value(client, LM87_REG_CONFIG) & 0x6F; |
880 | |
881 | rc = devm_add_action(&client->dev, lm87_restore_config, client); |
882 | if (rc) |
883 | return rc; |
884 | |
885 | if (!(data->config & 0x01)) { |
886 | int i; |
887 | |
888 | /* Limits are left uninitialized after power-up */ |
889 | for (i = 1; i < 6; i++) { |
890 | lm87_write_value(client, LM87_REG_IN_MIN(i), value: 0x00); |
891 | lm87_write_value(client, LM87_REG_IN_MAX(i), value: 0xFF); |
892 | } |
893 | for (i = 0; i < 2; i++) { |
894 | lm87_write_value(client, reg: LM87_REG_TEMP_HIGH[i], value: 0x7F); |
895 | lm87_write_value(client, reg: LM87_REG_TEMP_LOW[i], value: 0x00); |
896 | lm87_write_value(client, LM87_REG_AIN_MIN(i), value: 0x00); |
897 | lm87_write_value(client, LM87_REG_AIN_MAX(i), value: 0xFF); |
898 | } |
899 | if (data->channel & CHAN_TEMP3) { |
900 | lm87_write_value(client, reg: LM87_REG_TEMP_HIGH[2], value: 0x7F); |
901 | lm87_write_value(client, reg: LM87_REG_TEMP_LOW[2], value: 0x00); |
902 | } else { |
903 | lm87_write_value(client, LM87_REG_IN_MIN(0), value: 0x00); |
904 | lm87_write_value(client, LM87_REG_IN_MAX(0), value: 0xFF); |
905 | } |
906 | } |
907 | |
908 | /* Make sure Start is set and INT#_Clear is clear */ |
909 | if ((data->config & 0x09) != 0x01) |
910 | lm87_write_value(client, LM87_REG_CONFIG, |
911 | value: (data->config & 0x77) | 0x01); |
912 | return 0; |
913 | } |
914 | |
915 | static int lm87_probe(struct i2c_client *client) |
916 | { |
917 | struct lm87_data *data; |
918 | struct device *hwmon_dev; |
919 | int err; |
920 | unsigned int group_tail = 0; |
921 | |
922 | data = devm_kzalloc(dev: &client->dev, size: sizeof(struct lm87_data), GFP_KERNEL); |
923 | if (!data) |
924 | return -ENOMEM; |
925 | |
926 | i2c_set_clientdata(client, data); |
927 | mutex_init(&data->update_lock); |
928 | |
929 | /* Initialize the LM87 chip */ |
930 | err = lm87_init_client(client); |
931 | if (err) |
932 | return err; |
933 | |
934 | data->in_scale[0] = 2500; |
935 | data->in_scale[1] = 2700; |
936 | data->in_scale[2] = (data->channel & CHAN_VCC_5V) ? 5000 : 3300; |
937 | data->in_scale[3] = 5000; |
938 | data->in_scale[4] = 12000; |
939 | data->in_scale[5] = 2700; |
940 | data->in_scale[6] = 1875; |
941 | data->in_scale[7] = 1875; |
942 | |
943 | /* |
944 | * Construct the list of attributes, the list depends on the |
945 | * configuration of the chip |
946 | */ |
947 | data->attr_groups[group_tail++] = &lm87_group; |
948 | if (data->channel & CHAN_NO_FAN(0)) |
949 | data->attr_groups[group_tail++] = &lm87_group_in6; |
950 | else |
951 | data->attr_groups[group_tail++] = &lm87_group_fan1; |
952 | |
953 | if (data->channel & CHAN_NO_FAN(1)) |
954 | data->attr_groups[group_tail++] = &lm87_group_in7; |
955 | else |
956 | data->attr_groups[group_tail++] = &lm87_group_fan2; |
957 | |
958 | if (data->channel & CHAN_TEMP3) |
959 | data->attr_groups[group_tail++] = &lm87_group_temp3; |
960 | else |
961 | data->attr_groups[group_tail++] = &lm87_group_in0_5; |
962 | |
963 | if (!(data->channel & CHAN_NO_VID)) { |
964 | data->vrm = vid_which_vrm(); |
965 | data->attr_groups[group_tail++] = &lm87_group_vid; |
966 | } |
967 | |
968 | hwmon_dev = devm_hwmon_device_register_with_groups( |
969 | dev: &client->dev, name: client->name, drvdata: client, groups: data->attr_groups); |
970 | return PTR_ERR_OR_ZERO(ptr: hwmon_dev); |
971 | } |
972 | |
973 | /* |
974 | * Driver data (common to all clients) |
975 | */ |
976 | |
977 | static const struct i2c_device_id lm87_id[] = { |
978 | { "lm87" , 0 }, |
979 | { "adm1024" , 0 }, |
980 | { } |
981 | }; |
982 | MODULE_DEVICE_TABLE(i2c, lm87_id); |
983 | |
984 | static const struct of_device_id lm87_of_match[] = { |
985 | { .compatible = "ti,lm87" }, |
986 | { .compatible = "adi,adm1024" }, |
987 | { }, |
988 | }; |
989 | MODULE_DEVICE_TABLE(of, lm87_of_match); |
990 | |
991 | static struct i2c_driver lm87_driver = { |
992 | .class = I2C_CLASS_HWMON, |
993 | .driver = { |
994 | .name = "lm87" , |
995 | .of_match_table = lm87_of_match, |
996 | }, |
997 | .probe = lm87_probe, |
998 | .id_table = lm87_id, |
999 | .detect = lm87_detect, |
1000 | .address_list = normal_i2c, |
1001 | }; |
1002 | |
1003 | module_i2c_driver(lm87_driver); |
1004 | |
1005 | MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de> and others" ); |
1006 | MODULE_DESCRIPTION("LM87 driver" ); |
1007 | MODULE_LICENSE("GPL" ); |
1008 | |