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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * adm1025.c
4 *
5 * Copyright (C) 2000 Chen-Yuan Wu <gwu@esoft.com>
6 * Copyright (C) 2003-2009 Jean Delvare <jdelvare@suse.de>
7 *
8 * The ADM1025 is a sensor chip made by Analog Devices. It reports up to 6
9 * voltages (including its own power source) and up to two temperatures
10 * (its own plus up to one external one). Voltages are scaled internally
11 * (which is not the common way) with ratios such that the nominal value
12 * of each voltage correspond to a register value of 192 (which means a
13 * resolution of about 0.5% of the nominal value). Temperature values are
14 * reported with a 1 deg resolution and a 3 deg accuracy. Complete
15 * datasheet can be obtained from Analog's website at:
16 * https://www.onsemi.com/PowerSolutions/product.do?id=ADM1025
17 *
18 * This driver also supports the ADM1025A, which differs from the ADM1025
19 * only in that it has "open-drain VID inputs while the ADM1025 has
20 * on-chip 100k pull-ups on the VID inputs". It doesn't make any
21 * difference for us.
22 *
23 * This driver also supports the NE1619, a sensor chip made by Philips.
24 * That chip is similar to the ADM1025A, with a few differences. The only
25 * difference that matters to us is that the NE1619 has only two possible
26 * addresses while the ADM1025A has a third one. Complete datasheet can be
27 * obtained from Philips's website at:
28 * http://www.semiconductors.philips.com/pip/NE1619DS.html
29 *
30 * Since the ADM1025 was the first chipset supported by this driver, most
31 * comments will refer to this chipset, but are actually general and
32 * concern all supported chipsets, unless mentioned otherwise.
33 */
34
35#include <linux/module.h>
36#include <linux/init.h>
37#include <linux/slab.h>
38#include <linux/jiffies.h>
39#include <linux/i2c.h>
40#include <linux/hwmon.h>
41#include <linux/hwmon-sysfs.h>
42#include <linux/hwmon-vid.h>
43#include <linux/err.h>
44#include <linux/mutex.h>
45
46/*
47 * Addresses to scan
48 * ADM1025 and ADM1025A have three possible addresses: 0x2c, 0x2d and 0x2e.
49 * NE1619 has two possible addresses: 0x2c and 0x2d.
50 */
51
52static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
53
54enum chips { adm1025, ne1619 };
55
56/*
57 * The ADM1025 registers
58 */
59
60#define ADM1025_REG_MAN_ID 0x3E
61#define ADM1025_REG_CHIP_ID 0x3F
62#define ADM1025_REG_CONFIG 0x40
63#define ADM1025_REG_STATUS1 0x41
64#define ADM1025_REG_STATUS2 0x42
65#define ADM1025_REG_IN(nr) (0x20 + (nr))
66#define ADM1025_REG_IN_MAX(nr) (0x2B + (nr) * 2)
67#define ADM1025_REG_IN_MIN(nr) (0x2C + (nr) * 2)
68#define ADM1025_REG_TEMP(nr) (0x26 + (nr))
69#define ADM1025_REG_TEMP_HIGH(nr) (0x37 + (nr) * 2)
70#define ADM1025_REG_TEMP_LOW(nr) (0x38 + (nr) * 2)
71#define ADM1025_REG_VID 0x47
72#define ADM1025_REG_VID4 0x49
73
74/*
75 * Conversions and various macros
76 * The ADM1025 uses signed 8-bit values for temperatures.
77 */
78
79static const int in_scale[6] = { 2500, 2250, 3300, 5000, 12000, 3300 };
80
81#define IN_FROM_REG(reg, scale) (((reg) * (scale) + 96) / 192)
82#define IN_TO_REG(val, scale) ((val) <= 0 ? 0 : \
83 (val) >= (scale) * 255 / 192 ? 255 : \
84 ((val) * 192 + (scale) / 2) / (scale))
85
86#define TEMP_FROM_REG(reg) ((reg) * 1000)
87#define TEMP_TO_REG(val) ((val) <= -127500 ? -128 : \
88 (val) >= 126500 ? 127 : \
89 (((val) < 0 ? (val) - 500 : \
90 (val) + 500) / 1000))
91
92/*
93 * Client data (each client gets its own)
94 */
95
96struct adm1025_data {
97 struct i2c_client *client;
98 const struct attribute_group *groups[3];
99 struct mutex update_lock;
100 char valid; /* zero until following fields are valid */
101 unsigned long last_updated; /* in jiffies */
102
103 u8 in[6]; /* register value */
104 u8 in_max[6]; /* register value */
105 u8 in_min[6]; /* register value */
106 s8 temp[2]; /* register value */
107 s8 temp_min[2]; /* register value */
108 s8 temp_max[2]; /* register value */
109 u16 alarms; /* register values, combined */
110 u8 vid; /* register values, combined */
111 u8 vrm;
112};
113
114static struct adm1025_data *adm1025_update_device(struct device *dev)
115{
116 struct adm1025_data *data = dev_get_drvdata(dev);
117 struct i2c_client *client = data->client;
118
119 mutex_lock(&data->update_lock);
120
121 if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
122 int i;
123
124 dev_dbg(&client->dev, "Updating data.\n");
125 for (i = 0; i < 6; i++) {
126 data->in[i] = i2c_smbus_read_byte_data(client,
127 ADM1025_REG_IN(i));
128 data->in_min[i] = i2c_smbus_read_byte_data(client,
129 ADM1025_REG_IN_MIN(i));
130 data->in_max[i] = i2c_smbus_read_byte_data(client,
131 ADM1025_REG_IN_MAX(i));
132 }
133 for (i = 0; i < 2; i++) {
134 data->temp[i] = i2c_smbus_read_byte_data(client,
135 ADM1025_REG_TEMP(i));
136 data->temp_min[i] = i2c_smbus_read_byte_data(client,
137 ADM1025_REG_TEMP_LOW(i));
138 data->temp_max[i] = i2c_smbus_read_byte_data(client,
139 ADM1025_REG_TEMP_HIGH(i));
140 }
141 data->alarms = i2c_smbus_read_byte_data(client,
142 ADM1025_REG_STATUS1)
143 | (i2c_smbus_read_byte_data(client,
144 ADM1025_REG_STATUS2) << 8);
145 data->vid = (i2c_smbus_read_byte_data(client,
146 ADM1025_REG_VID) & 0x0f)
147 | ((i2c_smbus_read_byte_data(client,
148 ADM1025_REG_VID4) & 0x01) << 4);
149
150 data->last_updated = jiffies;
151 data->valid = 1;
152 }
153
154 mutex_unlock(&data->update_lock);
155
156 return data;
157}
158
159/*
160 * Sysfs stuff
161 */
162
163static ssize_t
164in_show(struct device *dev, struct device_attribute *attr, char *buf)
165{
166 int index = to_sensor_dev_attr(attr)->index;
167 struct adm1025_data *data = adm1025_update_device(dev);
168 return sprintf(buf, "%u\n", IN_FROM_REG(data->in[index],
169 in_scale[index]));
170}
171
172static ssize_t
173in_min_show(struct device *dev, struct device_attribute *attr, char *buf)
174{
175 int index = to_sensor_dev_attr(attr)->index;
176 struct adm1025_data *data = adm1025_update_device(dev);
177 return sprintf(buf, "%u\n", IN_FROM_REG(data->in_min[index],
178 in_scale[index]));
179}
180
181static ssize_t
182in_max_show(struct device *dev, struct device_attribute *attr, char *buf)
183{
184 int index = to_sensor_dev_attr(attr)->index;
185 struct adm1025_data *data = adm1025_update_device(dev);
186 return sprintf(buf, "%u\n", IN_FROM_REG(data->in_max[index],
187 in_scale[index]));
188}
189
190static ssize_t
191temp_show(struct device *dev, struct device_attribute *attr, char *buf)
192{
193 int index = to_sensor_dev_attr(attr)->index;
194 struct adm1025_data *data = adm1025_update_device(dev);
195 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[index]));
196}
197
198static ssize_t
199temp_min_show(struct device *dev, struct device_attribute *attr, char *buf)
200{
201 int index = to_sensor_dev_attr(attr)->index;
202 struct adm1025_data *data = adm1025_update_device(dev);
203 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_min[index]));
204}
205
206static ssize_t
207temp_max_show(struct device *dev, struct device_attribute *attr, char *buf)
208{
209 int index = to_sensor_dev_attr(attr)->index;
210 struct adm1025_data *data = adm1025_update_device(dev);
211 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[index]));
212}
213
214static ssize_t in_min_store(struct device *dev, struct device_attribute *attr,
215 const char *buf, size_t count)
216{
217 int index = to_sensor_dev_attr(attr)->index;
218 struct adm1025_data *data = dev_get_drvdata(dev);
219 struct i2c_client *client = data->client;
220 long val;
221 int err;
222
223 err = kstrtol(buf, 10, &val);
224 if (err)
225 return err;
226
227 mutex_lock(&data->update_lock);
228 data->in_min[index] = IN_TO_REG(val, in_scale[index]);
229 i2c_smbus_write_byte_data(client, ADM1025_REG_IN_MIN(index),
230 data->in_min[index]);
231 mutex_unlock(&data->update_lock);
232 return count;
233}
234
235static ssize_t in_max_store(struct device *dev, struct device_attribute *attr,
236 const char *buf, size_t count)
237{
238 int index = to_sensor_dev_attr(attr)->index;
239 struct adm1025_data *data = dev_get_drvdata(dev);
240 struct i2c_client *client = data->client;
241 long val;
242 int err;
243
244 err = kstrtol(buf, 10, &val);
245 if (err)
246 return err;
247
248 mutex_lock(&data->update_lock);
249 data->in_max[index] = IN_TO_REG(val, in_scale[index]);
250 i2c_smbus_write_byte_data(client, ADM1025_REG_IN_MAX(index),
251 data->in_max[index]);
252 mutex_unlock(&data->update_lock);
253 return count;
254}
255
256static SENSOR_DEVICE_ATTR_RO(in0_input, in, 0);
257static SENSOR_DEVICE_ATTR_RW(in0_min, in_min, 0);
258static SENSOR_DEVICE_ATTR_RW(in0_max, in_max, 0);
259static SENSOR_DEVICE_ATTR_RO(in1_input, in, 1);
260static SENSOR_DEVICE_ATTR_RW(in1_min, in_min, 1);
261static SENSOR_DEVICE_ATTR_RW(in1_max, in_max, 1);
262static SENSOR_DEVICE_ATTR_RO(in2_input, in, 2);
263static SENSOR_DEVICE_ATTR_RW(in2_min, in_min, 2);
264static SENSOR_DEVICE_ATTR_RW(in2_max, in_max, 2);
265static SENSOR_DEVICE_ATTR_RO(in3_input, in, 3);
266static SENSOR_DEVICE_ATTR_RW(in3_min, in_min, 3);
267static SENSOR_DEVICE_ATTR_RW(in3_max, in_max, 3);
268static SENSOR_DEVICE_ATTR_RO(in4_input, in, 4);
269static SENSOR_DEVICE_ATTR_RW(in4_min, in_min, 4);
270static SENSOR_DEVICE_ATTR_RW(in4_max, in_max, 4);
271static SENSOR_DEVICE_ATTR_RO(in5_input, in, 5);
272static SENSOR_DEVICE_ATTR_RW(in5_min, in_min, 5);
273static SENSOR_DEVICE_ATTR_RW(in5_max, in_max, 5);
274
275static ssize_t temp_min_store(struct device *dev,
276 struct device_attribute *attr, const char *buf,
277 size_t count)
278{
279 int index = to_sensor_dev_attr(attr)->index;
280 struct adm1025_data *data = dev_get_drvdata(dev);
281 struct i2c_client *client = data->client;
282 long val;
283 int err;
284
285 err = kstrtol(buf, 10, &val);
286 if (err)
287 return err;
288
289 mutex_lock(&data->update_lock);
290 data->temp_min[index] = TEMP_TO_REG(val);
291 i2c_smbus_write_byte_data(client, ADM1025_REG_TEMP_LOW(index),
292 data->temp_min[index]);
293 mutex_unlock(&data->update_lock);
294 return count;
295}
296
297static ssize_t temp_max_store(struct device *dev,
298 struct device_attribute *attr, const char *buf,
299 size_t count)
300{
301 int index = to_sensor_dev_attr(attr)->index;
302 struct adm1025_data *data = dev_get_drvdata(dev);
303 struct i2c_client *client = data->client;
304 long val;
305 int err;
306
307 err = kstrtol(buf, 10, &val);
308 if (err)
309 return err;
310
311 mutex_lock(&data->update_lock);
312 data->temp_max[index] = TEMP_TO_REG(val);
313 i2c_smbus_write_byte_data(client, ADM1025_REG_TEMP_HIGH(index),
314 data->temp_max[index]);
315 mutex_unlock(&data->update_lock);
316 return count;
317}
318
319static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0);
320static SENSOR_DEVICE_ATTR_RW(temp1_min, temp_min, 0);
321static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_max, 0);
322static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1);
323static SENSOR_DEVICE_ATTR_RW(temp2_min, temp_min, 1);
324static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_max, 1);
325
326static ssize_t
327alarms_show(struct device *dev, struct device_attribute *attr, char *buf)
328{
329 struct adm1025_data *data = adm1025_update_device(dev);
330 return sprintf(buf, "%u\n", data->alarms);
331}
332static DEVICE_ATTR_RO(alarms);
333
334static ssize_t
335alarm_show(struct device *dev, struct device_attribute *attr, char *buf)
336{
337 int bitnr = to_sensor_dev_attr(attr)->index;
338 struct adm1025_data *data = adm1025_update_device(dev);
339 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
340}
341static SENSOR_DEVICE_ATTR_RO(in0_alarm, alarm, 0);
342static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 1);
343static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 2);
344static SENSOR_DEVICE_ATTR_RO(in3_alarm, alarm, 3);
345static SENSOR_DEVICE_ATTR_RO(in4_alarm, alarm, 8);
346static SENSOR_DEVICE_ATTR_RO(in5_alarm, alarm, 9);
347static SENSOR_DEVICE_ATTR_RO(temp1_alarm, alarm, 5);
348static SENSOR_DEVICE_ATTR_RO(temp2_alarm, alarm, 4);
349static SENSOR_DEVICE_ATTR_RO(temp1_fault, alarm, 14);
350
351static ssize_t
352cpu0_vid_show(struct device *dev, struct device_attribute *attr, char *buf)
353{
354 struct adm1025_data *data = adm1025_update_device(dev);
355 return sprintf(buf, "%u\n", vid_from_reg(data->vid, data->vrm));
356}
357static DEVICE_ATTR_RO(cpu0_vid);
358
359static ssize_t
360vrm_show(struct device *dev, struct device_attribute *attr, char *buf)
361{
362 struct adm1025_data *data = dev_get_drvdata(dev);
363 return sprintf(buf, "%u\n", data->vrm);
364}
365static ssize_t vrm_store(struct device *dev, struct device_attribute *attr,
366 const char *buf, size_t count)
367{
368 struct adm1025_data *data = dev_get_drvdata(dev);
369 unsigned long val;
370 int err;
371
372 err = kstrtoul(buf, 10, &val);
373 if (err)
374 return err;
375
376 if (val > 255)
377 return -EINVAL;
378
379 data->vrm = val;
380 return count;
381}
382static DEVICE_ATTR_RW(vrm);
383
384/*
385 * Real code
386 */
387
388static struct attribute *adm1025_attributes[] = {
389 &sensor_dev_attr_in0_input.dev_attr.attr,
390 &sensor_dev_attr_in1_input.dev_attr.attr,
391 &sensor_dev_attr_in2_input.dev_attr.attr,
392 &sensor_dev_attr_in3_input.dev_attr.attr,
393 &sensor_dev_attr_in5_input.dev_attr.attr,
394 &sensor_dev_attr_in0_min.dev_attr.attr,
395 &sensor_dev_attr_in1_min.dev_attr.attr,
396 &sensor_dev_attr_in2_min.dev_attr.attr,
397 &sensor_dev_attr_in3_min.dev_attr.attr,
398 &sensor_dev_attr_in5_min.dev_attr.attr,
399 &sensor_dev_attr_in0_max.dev_attr.attr,
400 &sensor_dev_attr_in1_max.dev_attr.attr,
401 &sensor_dev_attr_in2_max.dev_attr.attr,
402 &sensor_dev_attr_in3_max.dev_attr.attr,
403 &sensor_dev_attr_in5_max.dev_attr.attr,
404 &sensor_dev_attr_in0_alarm.dev_attr.attr,
405 &sensor_dev_attr_in1_alarm.dev_attr.attr,
406 &sensor_dev_attr_in2_alarm.dev_attr.attr,
407 &sensor_dev_attr_in3_alarm.dev_attr.attr,
408 &sensor_dev_attr_in5_alarm.dev_attr.attr,
409 &sensor_dev_attr_temp1_input.dev_attr.attr,
410 &sensor_dev_attr_temp2_input.dev_attr.attr,
411 &sensor_dev_attr_temp1_min.dev_attr.attr,
412 &sensor_dev_attr_temp2_min.dev_attr.attr,
413 &sensor_dev_attr_temp1_max.dev_attr.attr,
414 &sensor_dev_attr_temp2_max.dev_attr.attr,
415 &sensor_dev_attr_temp1_alarm.dev_attr.attr,
416 &sensor_dev_attr_temp2_alarm.dev_attr.attr,
417 &sensor_dev_attr_temp1_fault.dev_attr.attr,
418 &dev_attr_alarms.attr,
419 &dev_attr_cpu0_vid.attr,
420 &dev_attr_vrm.attr,
421 NULL
422};
423
424static const struct attribute_group adm1025_group = {
425 .attrs = adm1025_attributes,
426};
427
428static struct attribute *adm1025_attributes_in4[] = {
429 &sensor_dev_attr_in4_input.dev_attr.attr,
430 &sensor_dev_attr_in4_min.dev_attr.attr,
431 &sensor_dev_attr_in4_max.dev_attr.attr,
432 &sensor_dev_attr_in4_alarm.dev_attr.attr,
433 NULL
434};
435
436static const struct attribute_group adm1025_group_in4 = {
437 .attrs = adm1025_attributes_in4,
438};
439
440/* Return 0 if detection is successful, -ENODEV otherwise */
441static int adm1025_detect(struct i2c_client *client,
442 struct i2c_board_info *info)
443{
444 struct i2c_adapter *adapter = client->adapter;
445 const char *name;
446 u8 man_id, chip_id;
447
448 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
449 return -ENODEV;
450
451 /* Check for unused bits */
452 if ((i2c_smbus_read_byte_data(client, ADM1025_REG_CONFIG) & 0x80)
453 || (i2c_smbus_read_byte_data(client, ADM1025_REG_STATUS1) & 0xC0)
454 || (i2c_smbus_read_byte_data(client, ADM1025_REG_STATUS2) & 0xBC)) {
455 dev_dbg(&adapter->dev, "ADM1025 detection failed at 0x%02x\n",
456 client->addr);
457 return -ENODEV;
458 }
459
460 /* Identification */
461 chip_id = i2c_smbus_read_byte_data(client, ADM1025_REG_CHIP_ID);
462 if ((chip_id & 0xF0) != 0x20)
463 return -ENODEV;
464
465 man_id = i2c_smbus_read_byte_data(client, ADM1025_REG_MAN_ID);
466 if (man_id == 0x41)
467 name = "adm1025";
468 else if (man_id == 0xA1 && client->addr != 0x2E)
469 name = "ne1619";
470 else
471 return -ENODEV;
472
473 strlcpy(info->type, name, I2C_NAME_SIZE);
474
475 return 0;
476}
477
478static void adm1025_init_client(struct i2c_client *client)
479{
480 u8 reg;
481 struct adm1025_data *data = i2c_get_clientdata(client);
482 int i;
483
484 data->vrm = vid_which_vrm();
485
486 /*
487 * Set high limits
488 * Usually we avoid setting limits on driver init, but it happens
489 * that the ADM1025 comes with stupid default limits (all registers
490 * set to 0). In case the chip has not gone through any limit
491 * setting yet, we better set the high limits to the max so that
492 * no alarm triggers.
493 */
494 for (i = 0; i < 6; i++) {
495 reg = i2c_smbus_read_byte_data(client,
496 ADM1025_REG_IN_MAX(i));
497 if (reg == 0)
498 i2c_smbus_write_byte_data(client,
499 ADM1025_REG_IN_MAX(i),
500 0xFF);
501 }
502 for (i = 0; i < 2; i++) {
503 reg = i2c_smbus_read_byte_data(client,
504 ADM1025_REG_TEMP_HIGH(i));
505 if (reg == 0)
506 i2c_smbus_write_byte_data(client,
507 ADM1025_REG_TEMP_HIGH(i),
508 0x7F);
509 }
510
511 /*
512 * Start the conversions
513 */
514 reg = i2c_smbus_read_byte_data(client, ADM1025_REG_CONFIG);
515 if (!(reg & 0x01))
516 i2c_smbus_write_byte_data(client, ADM1025_REG_CONFIG,
517 (reg&0x7E)|0x01);
518}
519
520static int adm1025_probe(struct i2c_client *client,
521 const struct i2c_device_id *id)
522{
523 struct device *dev = &client->dev;
524 struct device *hwmon_dev;
525 struct adm1025_data *data;
526 u8 config;
527
528 data = devm_kzalloc(dev, sizeof(struct adm1025_data), GFP_KERNEL);
529 if (!data)
530 return -ENOMEM;
531
532 i2c_set_clientdata(client, data);
533 data->client = client;
534 mutex_init(&data->update_lock);
535
536 /* Initialize the ADM1025 chip */
537 adm1025_init_client(client);
538
539 /* sysfs hooks */
540 data->groups[0] = &adm1025_group;
541 /* Pin 11 is either in4 (+12V) or VID4 */
542 config = i2c_smbus_read_byte_data(client, ADM1025_REG_CONFIG);
543 if (!(config & 0x20))
544 data->groups[1] = &adm1025_group_in4;
545
546 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
547 data, data->groups);
548 return PTR_ERR_OR_ZERO(hwmon_dev);
549}
550
551static const struct i2c_device_id adm1025_id[] = {
552 { "adm1025", adm1025 },
553 { "ne1619", ne1619 },
554 { }
555};
556MODULE_DEVICE_TABLE(i2c, adm1025_id);
557
558static struct i2c_driver adm1025_driver = {
559 .class = I2C_CLASS_HWMON,
560 .driver = {
561 .name = "adm1025",
562 },
563 .probe = adm1025_probe,
564 .id_table = adm1025_id,
565 .detect = adm1025_detect,
566 .address_list = normal_i2c,
567};
568
569module_i2c_driver(adm1025_driver);
570
571MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
572MODULE_DESCRIPTION("ADM1025 driver");
573MODULE_LICENSE("GPL");
1/*
2 * adm1025.c
3 *
4 * Copyright (C) 2000 Chen-Yuan Wu <gwu@esoft.com>
5 * Copyright (C) 2003-2009 Jean Delvare <jdelvare@suse.de>
6 *
7 * The ADM1025 is a sensor chip made by Analog Devices. It reports up to 6
8 * voltages (including its own power source) and up to two temperatures
9 * (its own plus up to one external one). Voltages are scaled internally
10 * (which is not the common way) with ratios such that the nominal value
11 * of each voltage correspond to a register value of 192 (which means a
12 * resolution of about 0.5% of the nominal value). Temperature values are
13 * reported with a 1 deg resolution and a 3 deg accuracy. Complete
14 * datasheet can be obtained from Analog's website at:
15 * http://www.onsemi.com/PowerSolutions/product.do?id=ADM1025
16 *
17 * This driver also supports the ADM1025A, which differs from the ADM1025
18 * only in that it has "open-drain VID inputs while the ADM1025 has
19 * on-chip 100k pull-ups on the VID inputs". It doesn't make any
20 * difference for us.
21 *
22 * This driver also supports the NE1619, a sensor chip made by Philips.
23 * That chip is similar to the ADM1025A, with a few differences. The only
24 * difference that matters to us is that the NE1619 has only two possible
25 * addresses while the ADM1025A has a third one. Complete datasheet can be
26 * obtained from Philips's website at:
27 * http://www.semiconductors.philips.com/pip/NE1619DS.html
28 *
29 * Since the ADM1025 was the first chipset supported by this driver, most
30 * comments will refer to this chipset, but are actually general and
31 * concern all supported chipsets, unless mentioned otherwise.
32 *
33 * This program is free software; you can redistribute it and/or modify
34 * it under the terms of the GNU General Public License as published by
35 * the Free Software Foundation; either version 2 of the License, or
36 * (at your option) any later version.
37 *
38 * This program is distributed in the hope that it will be useful,
39 * but WITHOUT ANY WARRANTY; without even the implied warranty of
40 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
41 * GNU General Public License for more details.
42 *
43 * You should have received a copy of the GNU General Public License
44 * along with this program; if not, write to the Free Software
45 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
46 */
47
48#include <linux/module.h>
49#include <linux/init.h>
50#include <linux/slab.h>
51#include <linux/jiffies.h>
52#include <linux/i2c.h>
53#include <linux/hwmon.h>
54#include <linux/hwmon-sysfs.h>
55#include <linux/hwmon-vid.h>
56#include <linux/err.h>
57#include <linux/mutex.h>
58
59/*
60 * Addresses to scan
61 * ADM1025 and ADM1025A have three possible addresses: 0x2c, 0x2d and 0x2e.
62 * NE1619 has two possible addresses: 0x2c and 0x2d.
63 */
64
65static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
66
67enum chips { adm1025, ne1619 };
68
69/*
70 * The ADM1025 registers
71 */
72
73#define ADM1025_REG_MAN_ID 0x3E
74#define ADM1025_REG_CHIP_ID 0x3F
75#define ADM1025_REG_CONFIG 0x40
76#define ADM1025_REG_STATUS1 0x41
77#define ADM1025_REG_STATUS2 0x42
78#define ADM1025_REG_IN(nr) (0x20 + (nr))
79#define ADM1025_REG_IN_MAX(nr) (0x2B + (nr) * 2)
80#define ADM1025_REG_IN_MIN(nr) (0x2C + (nr) * 2)
81#define ADM1025_REG_TEMP(nr) (0x26 + (nr))
82#define ADM1025_REG_TEMP_HIGH(nr) (0x37 + (nr) * 2)
83#define ADM1025_REG_TEMP_LOW(nr) (0x38 + (nr) * 2)
84#define ADM1025_REG_VID 0x47
85#define ADM1025_REG_VID4 0x49
86
87/*
88 * Conversions and various macros
89 * The ADM1025 uses signed 8-bit values for temperatures.
90 */
91
92static const int in_scale[6] = { 2500, 2250, 3300, 5000, 12000, 3300 };
93
94#define IN_FROM_REG(reg, scale) (((reg) * (scale) + 96) / 192)
95#define IN_TO_REG(val, scale) ((val) <= 0 ? 0 : \
96 (val) * 192 >= (scale) * 255 ? 255 : \
97 ((val) * 192 + (scale) / 2) / (scale))
98
99#define TEMP_FROM_REG(reg) ((reg) * 1000)
100#define TEMP_TO_REG(val) ((val) <= -127500 ? -128 : \
101 (val) >= 126500 ? 127 : \
102 (((val) < 0 ? (val) - 500 : \
103 (val) + 500) / 1000))
104
105/*
106 * Functions declaration
107 */
108
109static int adm1025_probe(struct i2c_client *client,
110 const struct i2c_device_id *id);
111static int adm1025_detect(struct i2c_client *client,
112 struct i2c_board_info *info);
113static void adm1025_init_client(struct i2c_client *client);
114static int adm1025_remove(struct i2c_client *client);
115static struct adm1025_data *adm1025_update_device(struct device *dev);
116
117/*
118 * Driver data (common to all clients)
119 */
120
121static const struct i2c_device_id adm1025_id[] = {
122 { "adm1025", adm1025 },
123 { "ne1619", ne1619 },
124 { }
125};
126MODULE_DEVICE_TABLE(i2c, adm1025_id);
127
128static struct i2c_driver adm1025_driver = {
129 .class = I2C_CLASS_HWMON,
130 .driver = {
131 .name = "adm1025",
132 },
133 .probe = adm1025_probe,
134 .remove = adm1025_remove,
135 .id_table = adm1025_id,
136 .detect = adm1025_detect,
137 .address_list = normal_i2c,
138};
139
140/*
141 * Client data (each client gets its own)
142 */
143
144struct adm1025_data {
145 struct device *hwmon_dev;
146 struct mutex update_lock;
147 char valid; /* zero until following fields are valid */
148 unsigned long last_updated; /* in jiffies */
149
150 u8 in[6]; /* register value */
151 u8 in_max[6]; /* register value */
152 u8 in_min[6]; /* register value */
153 s8 temp[2]; /* register value */
154 s8 temp_min[2]; /* register value */
155 s8 temp_max[2]; /* register value */
156 u16 alarms; /* register values, combined */
157 u8 vid; /* register values, combined */
158 u8 vrm;
159};
160
161/*
162 * Sysfs stuff
163 */
164
165static ssize_t
166show_in(struct device *dev, struct device_attribute *attr, char *buf)
167{
168 int index = to_sensor_dev_attr(attr)->index;
169 struct adm1025_data *data = adm1025_update_device(dev);
170 return sprintf(buf, "%u\n", IN_FROM_REG(data->in[index],
171 in_scale[index]));
172}
173
174static ssize_t
175show_in_min(struct device *dev, struct device_attribute *attr, char *buf)
176{
177 int index = to_sensor_dev_attr(attr)->index;
178 struct adm1025_data *data = adm1025_update_device(dev);
179 return sprintf(buf, "%u\n", IN_FROM_REG(data->in_min[index],
180 in_scale[index]));
181}
182
183static ssize_t
184show_in_max(struct device *dev, struct device_attribute *attr, char *buf)
185{
186 int index = to_sensor_dev_attr(attr)->index;
187 struct adm1025_data *data = adm1025_update_device(dev);
188 return sprintf(buf, "%u\n", IN_FROM_REG(data->in_max[index],
189 in_scale[index]));
190}
191
192static ssize_t
193show_temp(struct device *dev, struct device_attribute *attr, char *buf)
194{
195 int index = to_sensor_dev_attr(attr)->index;
196 struct adm1025_data *data = adm1025_update_device(dev);
197 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[index]));
198}
199
200static ssize_t
201show_temp_min(struct device *dev, struct device_attribute *attr, char *buf)
202{
203 int index = to_sensor_dev_attr(attr)->index;
204 struct adm1025_data *data = adm1025_update_device(dev);
205 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_min[index]));
206}
207
208static ssize_t
209show_temp_max(struct device *dev, struct device_attribute *attr, char *buf)
210{
211 int index = to_sensor_dev_attr(attr)->index;
212 struct adm1025_data *data = adm1025_update_device(dev);
213 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[index]));
214}
215
216static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
217 const char *buf, size_t count)
218{
219 int index = to_sensor_dev_attr(attr)->index;
220 struct i2c_client *client = to_i2c_client(dev);
221 struct adm1025_data *data = i2c_get_clientdata(client);
222 long val;
223 int err;
224
225 err = kstrtol(buf, 10, &val);
226 if (err)
227 return err;
228
229 mutex_lock(&data->update_lock);
230 data->in_min[index] = IN_TO_REG(val, in_scale[index]);
231 i2c_smbus_write_byte_data(client, ADM1025_REG_IN_MIN(index),
232 data->in_min[index]);
233 mutex_unlock(&data->update_lock);
234 return count;
235}
236
237static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
238 const char *buf, size_t count)
239{
240 int index = to_sensor_dev_attr(attr)->index;
241 struct i2c_client *client = to_i2c_client(dev);
242 struct adm1025_data *data = i2c_get_clientdata(client);
243 long val;
244 int err;
245
246 err = kstrtol(buf, 10, &val);
247 if (err)
248 return err;
249
250 mutex_lock(&data->update_lock);
251 data->in_max[index] = IN_TO_REG(val, in_scale[index]);
252 i2c_smbus_write_byte_data(client, ADM1025_REG_IN_MAX(index),
253 data->in_max[index]);
254 mutex_unlock(&data->update_lock);
255 return count;
256}
257
258#define set_in(offset) \
259static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \
260 show_in, NULL, offset); \
261static SENSOR_DEVICE_ATTR(in##offset##_min, S_IWUSR | S_IRUGO, \
262 show_in_min, set_in_min, offset); \
263static SENSOR_DEVICE_ATTR(in##offset##_max, S_IWUSR | S_IRUGO, \
264 show_in_max, set_in_max, offset)
265set_in(0);
266set_in(1);
267set_in(2);
268set_in(3);
269set_in(4);
270set_in(5);
271
272static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
273 const char *buf, size_t count)
274{
275 int index = to_sensor_dev_attr(attr)->index;
276 struct i2c_client *client = to_i2c_client(dev);
277 struct adm1025_data *data = i2c_get_clientdata(client);
278 long val;
279 int err;
280
281 err = kstrtol(buf, 10, &val);
282 if (err)
283 return err;
284
285 mutex_lock(&data->update_lock);
286 data->temp_min[index] = TEMP_TO_REG(val);
287 i2c_smbus_write_byte_data(client, ADM1025_REG_TEMP_LOW(index),
288 data->temp_min[index]);
289 mutex_unlock(&data->update_lock);
290 return count;
291}
292
293static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
294 const char *buf, size_t count)
295{
296 int index = to_sensor_dev_attr(attr)->index;
297 struct i2c_client *client = to_i2c_client(dev);
298 struct adm1025_data *data = i2c_get_clientdata(client);
299 long val;
300 int err;
301
302 err = kstrtol(buf, 10, &val);
303 if (err)
304 return err;
305
306 mutex_lock(&data->update_lock);
307 data->temp_max[index] = TEMP_TO_REG(val);
308 i2c_smbus_write_byte_data(client, ADM1025_REG_TEMP_HIGH(index),
309 data->temp_max[index]);
310 mutex_unlock(&data->update_lock);
311 return count;
312}
313
314#define set_temp(offset) \
315static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO, \
316 show_temp, NULL, offset - 1); \
317static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IWUSR | S_IRUGO, \
318 show_temp_min, set_temp_min, offset - 1); \
319static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IWUSR | S_IRUGO, \
320 show_temp_max, set_temp_max, offset - 1)
321set_temp(1);
322set_temp(2);
323
324static ssize_t
325show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
326{
327 struct adm1025_data *data = adm1025_update_device(dev);
328 return sprintf(buf, "%u\n", data->alarms);
329}
330static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
331
332static ssize_t
333show_alarm(struct device *dev, struct device_attribute *attr, char *buf)
334{
335 int bitnr = to_sensor_dev_attr(attr)->index;
336 struct adm1025_data *data = adm1025_update_device(dev);
337 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
338}
339static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
340static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
341static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
342static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
343static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
344static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9);
345static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 5);
346static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 4);
347static SENSOR_DEVICE_ATTR(temp1_fault, S_IRUGO, show_alarm, NULL, 14);
348
349static ssize_t
350show_vid(struct device *dev, struct device_attribute *attr, char *buf)
351{
352 struct adm1025_data *data = adm1025_update_device(dev);
353 return sprintf(buf, "%u\n", vid_from_reg(data->vid, data->vrm));
354}
355static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
356
357static ssize_t
358show_vrm(struct device *dev, struct device_attribute *attr, char *buf)
359{
360 struct adm1025_data *data = dev_get_drvdata(dev);
361 return sprintf(buf, "%u\n", data->vrm);
362}
363static ssize_t set_vrm(struct device *dev, struct device_attribute *attr,
364 const char *buf, size_t count)
365{
366 struct adm1025_data *data = dev_get_drvdata(dev);
367 unsigned long val;
368 int err;
369
370 err = kstrtoul(buf, 10, &val);
371 if (err)
372 return err;
373
374 data->vrm = val;
375 return count;
376}
377static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm);
378
379/*
380 * Real code
381 */
382
383static struct attribute *adm1025_attributes[] = {
384 &sensor_dev_attr_in0_input.dev_attr.attr,
385 &sensor_dev_attr_in1_input.dev_attr.attr,
386 &sensor_dev_attr_in2_input.dev_attr.attr,
387 &sensor_dev_attr_in3_input.dev_attr.attr,
388 &sensor_dev_attr_in5_input.dev_attr.attr,
389 &sensor_dev_attr_in0_min.dev_attr.attr,
390 &sensor_dev_attr_in1_min.dev_attr.attr,
391 &sensor_dev_attr_in2_min.dev_attr.attr,
392 &sensor_dev_attr_in3_min.dev_attr.attr,
393 &sensor_dev_attr_in5_min.dev_attr.attr,
394 &sensor_dev_attr_in0_max.dev_attr.attr,
395 &sensor_dev_attr_in1_max.dev_attr.attr,
396 &sensor_dev_attr_in2_max.dev_attr.attr,
397 &sensor_dev_attr_in3_max.dev_attr.attr,
398 &sensor_dev_attr_in5_max.dev_attr.attr,
399 &sensor_dev_attr_in0_alarm.dev_attr.attr,
400 &sensor_dev_attr_in1_alarm.dev_attr.attr,
401 &sensor_dev_attr_in2_alarm.dev_attr.attr,
402 &sensor_dev_attr_in3_alarm.dev_attr.attr,
403 &sensor_dev_attr_in5_alarm.dev_attr.attr,
404 &sensor_dev_attr_temp1_input.dev_attr.attr,
405 &sensor_dev_attr_temp2_input.dev_attr.attr,
406 &sensor_dev_attr_temp1_min.dev_attr.attr,
407 &sensor_dev_attr_temp2_min.dev_attr.attr,
408 &sensor_dev_attr_temp1_max.dev_attr.attr,
409 &sensor_dev_attr_temp2_max.dev_attr.attr,
410 &sensor_dev_attr_temp1_alarm.dev_attr.attr,
411 &sensor_dev_attr_temp2_alarm.dev_attr.attr,
412 &sensor_dev_attr_temp1_fault.dev_attr.attr,
413 &dev_attr_alarms.attr,
414 &dev_attr_cpu0_vid.attr,
415 &dev_attr_vrm.attr,
416 NULL
417};
418
419static const struct attribute_group adm1025_group = {
420 .attrs = adm1025_attributes,
421};
422
423static struct attribute *adm1025_attributes_in4[] = {
424 &sensor_dev_attr_in4_input.dev_attr.attr,
425 &sensor_dev_attr_in4_min.dev_attr.attr,
426 &sensor_dev_attr_in4_max.dev_attr.attr,
427 &sensor_dev_attr_in4_alarm.dev_attr.attr,
428 NULL
429};
430
431static const struct attribute_group adm1025_group_in4 = {
432 .attrs = adm1025_attributes_in4,
433};
434
435/* Return 0 if detection is successful, -ENODEV otherwise */
436static int adm1025_detect(struct i2c_client *client,
437 struct i2c_board_info *info)
438{
439 struct i2c_adapter *adapter = client->adapter;
440 const char *name;
441 u8 man_id, chip_id;
442
443 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
444 return -ENODEV;
445
446 /* Check for unused bits */
447 if ((i2c_smbus_read_byte_data(client, ADM1025_REG_CONFIG) & 0x80)
448 || (i2c_smbus_read_byte_data(client, ADM1025_REG_STATUS1) & 0xC0)
449 || (i2c_smbus_read_byte_data(client, ADM1025_REG_STATUS2) & 0xBC)) {
450 dev_dbg(&adapter->dev, "ADM1025 detection failed at 0x%02x\n",
451 client->addr);
452 return -ENODEV;
453 }
454
455 /* Identification */
456 chip_id = i2c_smbus_read_byte_data(client, ADM1025_REG_CHIP_ID);
457 if ((chip_id & 0xF0) != 0x20)
458 return -ENODEV;
459
460 man_id = i2c_smbus_read_byte_data(client, ADM1025_REG_MAN_ID);
461 if (man_id == 0x41)
462 name = "adm1025";
463 else if (man_id == 0xA1 && client->addr != 0x2E)
464 name = "ne1619";
465 else
466 return -ENODEV;
467
468 strlcpy(info->type, name, I2C_NAME_SIZE);
469
470 return 0;
471}
472
473static int adm1025_probe(struct i2c_client *client,
474 const struct i2c_device_id *id)
475{
476 struct adm1025_data *data;
477 int err;
478 u8 config;
479
480 data = devm_kzalloc(&client->dev, sizeof(struct adm1025_data),
481 GFP_KERNEL);
482 if (!data)
483 return -ENOMEM;
484
485 i2c_set_clientdata(client, data);
486 mutex_init(&data->update_lock);
487
488 /* Initialize the ADM1025 chip */
489 adm1025_init_client(client);
490
491 /* Register sysfs hooks */
492 err = sysfs_create_group(&client->dev.kobj, &adm1025_group);
493 if (err)
494 return err;
495
496 /* Pin 11 is either in4 (+12V) or VID4 */
497 config = i2c_smbus_read_byte_data(client, ADM1025_REG_CONFIG);
498 if (!(config & 0x20)) {
499 err = sysfs_create_group(&client->dev.kobj, &adm1025_group_in4);
500 if (err)
501 goto exit_remove;
502 }
503
504 data->hwmon_dev = hwmon_device_register(&client->dev);
505 if (IS_ERR(data->hwmon_dev)) {
506 err = PTR_ERR(data->hwmon_dev);
507 goto exit_remove;
508 }
509
510 return 0;
511
512exit_remove:
513 sysfs_remove_group(&client->dev.kobj, &adm1025_group);
514 sysfs_remove_group(&client->dev.kobj, &adm1025_group_in4);
515 return err;
516}
517
518static void adm1025_init_client(struct i2c_client *client)
519{
520 u8 reg;
521 struct adm1025_data *data = i2c_get_clientdata(client);
522 int i;
523
524 data->vrm = vid_which_vrm();
525
526 /*
527 * Set high limits
528 * Usually we avoid setting limits on driver init, but it happens
529 * that the ADM1025 comes with stupid default limits (all registers
530 * set to 0). In case the chip has not gone through any limit
531 * setting yet, we better set the high limits to the max so that
532 * no alarm triggers.
533 */
534 for (i = 0; i < 6; i++) {
535 reg = i2c_smbus_read_byte_data(client,
536 ADM1025_REG_IN_MAX(i));
537 if (reg == 0)
538 i2c_smbus_write_byte_data(client,
539 ADM1025_REG_IN_MAX(i),
540 0xFF);
541 }
542 for (i = 0; i < 2; i++) {
543 reg = i2c_smbus_read_byte_data(client,
544 ADM1025_REG_TEMP_HIGH(i));
545 if (reg == 0)
546 i2c_smbus_write_byte_data(client,
547 ADM1025_REG_TEMP_HIGH(i),
548 0x7F);
549 }
550
551 /*
552 * Start the conversions
553 */
554 reg = i2c_smbus_read_byte_data(client, ADM1025_REG_CONFIG);
555 if (!(reg & 0x01))
556 i2c_smbus_write_byte_data(client, ADM1025_REG_CONFIG,
557 (reg&0x7E)|0x01);
558}
559
560static int adm1025_remove(struct i2c_client *client)
561{
562 struct adm1025_data *data = i2c_get_clientdata(client);
563
564 hwmon_device_unregister(data->hwmon_dev);
565 sysfs_remove_group(&client->dev.kobj, &adm1025_group);
566 sysfs_remove_group(&client->dev.kobj, &adm1025_group_in4);
567
568 return 0;
569}
570
571static struct adm1025_data *adm1025_update_device(struct device *dev)
572{
573 struct i2c_client *client = to_i2c_client(dev);
574 struct adm1025_data *data = i2c_get_clientdata(client);
575
576 mutex_lock(&data->update_lock);
577
578 if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
579 int i;
580
581 dev_dbg(&client->dev, "Updating data.\n");
582 for (i = 0; i < 6; i++) {
583 data->in[i] = i2c_smbus_read_byte_data(client,
584 ADM1025_REG_IN(i));
585 data->in_min[i] = i2c_smbus_read_byte_data(client,
586 ADM1025_REG_IN_MIN(i));
587 data->in_max[i] = i2c_smbus_read_byte_data(client,
588 ADM1025_REG_IN_MAX(i));
589 }
590 for (i = 0; i < 2; i++) {
591 data->temp[i] = i2c_smbus_read_byte_data(client,
592 ADM1025_REG_TEMP(i));
593 data->temp_min[i] = i2c_smbus_read_byte_data(client,
594 ADM1025_REG_TEMP_LOW(i));
595 data->temp_max[i] = i2c_smbus_read_byte_data(client,
596 ADM1025_REG_TEMP_HIGH(i));
597 }
598 data->alarms = i2c_smbus_read_byte_data(client,
599 ADM1025_REG_STATUS1)
600 | (i2c_smbus_read_byte_data(client,
601 ADM1025_REG_STATUS2) << 8);
602 data->vid = (i2c_smbus_read_byte_data(client,
603 ADM1025_REG_VID) & 0x0f)
604 | ((i2c_smbus_read_byte_data(client,
605 ADM1025_REG_VID4) & 0x01) << 4);
606
607 data->last_updated = jiffies;
608 data->valid = 1;
609 }
610
611 mutex_unlock(&data->update_lock);
612
613 return data;
614}
615
616module_i2c_driver(adm1025_driver);
617
618MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
619MODULE_DESCRIPTION("ADM1025 driver");
620MODULE_LICENSE("GPL");