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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * adm1021.c - Part of lm_sensors, Linux kernel modules for hardware
4 * monitoring
5 * Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> and
6 * Philip Edelbrock <phil@netroedge.com>
7 */
8
9#include <linux/module.h>
10#include <linux/init.h>
11#include <linux/slab.h>
12#include <linux/jiffies.h>
13#include <linux/i2c.h>
14#include <linux/hwmon.h>
15#include <linux/hwmon-sysfs.h>
16#include <linux/err.h>
17#include <linux/mutex.h>
18
19
20/* Addresses to scan */
21static const unsigned short normal_i2c[] = {
22 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
23
24enum chips {
25 adm1021, adm1023, max1617, max1617a, thmc10, lm84, gl523sm, mc1066 };
26
27/* adm1021 constants specified below */
28
29/* The adm1021 registers */
30/* Read-only */
31/* For nr in 0-1 */
32#define ADM1021_REG_TEMP(nr) (nr)
33#define ADM1021_REG_STATUS 0x02
34/* 0x41 = AD, 0x49 = TI, 0x4D = Maxim, 0x23 = Genesys , 0x54 = Onsemi */
35#define ADM1021_REG_MAN_ID 0xFE
36/* ADM1021 = 0x0X, ADM1023 = 0x3X */
37#define ADM1021_REG_DEV_ID 0xFF
38/* These use different addresses for reading/writing */
39#define ADM1021_REG_CONFIG_R 0x03
40#define ADM1021_REG_CONFIG_W 0x09
41#define ADM1021_REG_CONV_RATE_R 0x04
42#define ADM1021_REG_CONV_RATE_W 0x0A
43/* These are for the ADM1023's additional precision on the remote temp sensor */
44#define ADM1023_REG_REM_TEMP_PREC 0x10
45#define ADM1023_REG_REM_OFFSET 0x11
46#define ADM1023_REG_REM_OFFSET_PREC 0x12
47#define ADM1023_REG_REM_TOS_PREC 0x13
48#define ADM1023_REG_REM_THYST_PREC 0x14
49/* limits */
50/* For nr in 0-1 */
51#define ADM1021_REG_TOS_R(nr) (0x05 + 2 * (nr))
52#define ADM1021_REG_TOS_W(nr) (0x0B + 2 * (nr))
53#define ADM1021_REG_THYST_R(nr) (0x06 + 2 * (nr))
54#define ADM1021_REG_THYST_W(nr) (0x0C + 2 * (nr))
55/* write-only */
56#define ADM1021_REG_ONESHOT 0x0F
57
58/* Initial values */
59
60/*
61 * Note: Even though I left the low and high limits named os and hyst,
62 * they don't quite work like a thermostat the way the LM75 does. I.e.,
63 * a lower temp than THYST actually triggers an alarm instead of
64 * clearing it. Weird, ey? --Phil
65 */
66
67/* Each client has this additional data */
68struct adm1021_data {
69 struct i2c_client *client;
70 enum chips type;
71
72 const struct attribute_group *groups[3];
73
74 struct mutex update_lock;
75 bool valid; /* true if following fields are valid */
76 char low_power; /* !=0 if device in low power mode */
77 unsigned long last_updated; /* In jiffies */
78
79 int temp_max[2]; /* Register values */
80 int temp_min[2];
81 int temp[2];
82 u8 alarms;
83 /* Special values for ADM1023 only */
84 u8 remote_temp_offset;
85 u8 remote_temp_offset_prec;
86};
87
88/* (amalysh) read only mode, otherwise any limit's writing confuse BIOS */
89static bool read_only;
90
91static struct adm1021_data *adm1021_update_device(struct device *dev)
92{
93 struct adm1021_data *data = dev_get_drvdata(dev);
94 struct i2c_client *client = data->client;
95
96 mutex_lock(&data->update_lock);
97
98 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
99 || !data->valid) {
100 int i;
101
102 dev_dbg(dev, "Starting adm1021 update\n");
103
104 for (i = 0; i < 2; i++) {
105 data->temp[i] = 1000 *
106 (s8) i2c_smbus_read_byte_data(
107 client, ADM1021_REG_TEMP(i));
108 data->temp_max[i] = 1000 *
109 (s8) i2c_smbus_read_byte_data(
110 client, ADM1021_REG_TOS_R(i));
111 if (data->type != lm84) {
112 data->temp_min[i] = 1000 *
113 (s8) i2c_smbus_read_byte_data(client,
114 ADM1021_REG_THYST_R(i));
115 }
116 }
117 data->alarms = i2c_smbus_read_byte_data(client,
118 ADM1021_REG_STATUS) & 0x7c;
119 if (data->type == adm1023) {
120 /*
121 * The ADM1023 provides 3 extra bits of precision for
122 * the remote sensor in extra registers.
123 */
124 data->temp[1] += 125 * (i2c_smbus_read_byte_data(
125 client, ADM1023_REG_REM_TEMP_PREC) >> 5);
126 data->temp_max[1] += 125 * (i2c_smbus_read_byte_data(
127 client, ADM1023_REG_REM_TOS_PREC) >> 5);
128 data->temp_min[1] += 125 * (i2c_smbus_read_byte_data(
129 client, ADM1023_REG_REM_THYST_PREC) >> 5);
130 data->remote_temp_offset =
131 i2c_smbus_read_byte_data(client,
132 ADM1023_REG_REM_OFFSET);
133 data->remote_temp_offset_prec =
134 i2c_smbus_read_byte_data(client,
135 ADM1023_REG_REM_OFFSET_PREC);
136 }
137 data->last_updated = jiffies;
138 data->valid = true;
139 }
140
141 mutex_unlock(&data->update_lock);
142
143 return data;
144}
145
146static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
147 char *buf)
148{
149 int index = to_sensor_dev_attr(devattr)->index;
150 struct adm1021_data *data = adm1021_update_device(dev);
151
152 return sprintf(buf, "%d\n", data->temp[index]);
153}
154
155static ssize_t temp_max_show(struct device *dev,
156 struct device_attribute *devattr, char *buf)
157{
158 int index = to_sensor_dev_attr(devattr)->index;
159 struct adm1021_data *data = adm1021_update_device(dev);
160
161 return sprintf(buf, "%d\n", data->temp_max[index]);
162}
163
164static ssize_t temp_min_show(struct device *dev,
165 struct device_attribute *devattr, char *buf)
166{
167 int index = to_sensor_dev_attr(devattr)->index;
168 struct adm1021_data *data = adm1021_update_device(dev);
169
170 return sprintf(buf, "%d\n", data->temp_min[index]);
171}
172
173static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
174 char *buf)
175{
176 int index = to_sensor_dev_attr(attr)->index;
177 struct adm1021_data *data = adm1021_update_device(dev);
178 return sprintf(buf, "%u\n", (data->alarms >> index) & 1);
179}
180
181static ssize_t alarms_show(struct device *dev,
182 struct device_attribute *attr,
183 char *buf)
184{
185 struct adm1021_data *data = adm1021_update_device(dev);
186 return sprintf(buf, "%u\n", data->alarms);
187}
188
189static ssize_t temp_max_store(struct device *dev,
190 struct device_attribute *devattr,
191 const char *buf, size_t count)
192{
193 int index = to_sensor_dev_attr(devattr)->index;
194 struct adm1021_data *data = dev_get_drvdata(dev);
195 struct i2c_client *client = data->client;
196 long temp;
197 int reg_val, err;
198
199 err = kstrtol(buf, 10, &temp);
200 if (err)
201 return err;
202 temp /= 1000;
203
204 mutex_lock(&data->update_lock);
205 reg_val = clamp_val(temp, -128, 127);
206 data->temp_max[index] = reg_val * 1000;
207 if (!read_only)
208 i2c_smbus_write_byte_data(client, ADM1021_REG_TOS_W(index),
209 reg_val);
210 mutex_unlock(&data->update_lock);
211
212 return count;
213}
214
215static ssize_t temp_min_store(struct device *dev,
216 struct device_attribute *devattr,
217 const char *buf, size_t count)
218{
219 int index = to_sensor_dev_attr(devattr)->index;
220 struct adm1021_data *data = dev_get_drvdata(dev);
221 struct i2c_client *client = data->client;
222 long temp;
223 int reg_val, err;
224
225 err = kstrtol(buf, 10, &temp);
226 if (err)
227 return err;
228 temp /= 1000;
229
230 mutex_lock(&data->update_lock);
231 reg_val = clamp_val(temp, -128, 127);
232 data->temp_min[index] = reg_val * 1000;
233 if (!read_only)
234 i2c_smbus_write_byte_data(client, ADM1021_REG_THYST_W(index),
235 reg_val);
236 mutex_unlock(&data->update_lock);
237
238 return count;
239}
240
241static ssize_t low_power_show(struct device *dev,
242 struct device_attribute *devattr, char *buf)
243{
244 struct adm1021_data *data = adm1021_update_device(dev);
245 return sprintf(buf, "%d\n", data->low_power);
246}
247
248static ssize_t low_power_store(struct device *dev,
249 struct device_attribute *devattr,
250 const char *buf, size_t count)
251{
252 struct adm1021_data *data = dev_get_drvdata(dev);
253 struct i2c_client *client = data->client;
254 char low_power;
255 unsigned long val;
256 int err;
257
258 err = kstrtoul(buf, 10, &val);
259 if (err)
260 return err;
261 low_power = val != 0;
262
263 mutex_lock(&data->update_lock);
264 if (low_power != data->low_power) {
265 int config = i2c_smbus_read_byte_data(
266 client, ADM1021_REG_CONFIG_R);
267 data->low_power = low_power;
268 i2c_smbus_write_byte_data(client, ADM1021_REG_CONFIG_W,
269 (config & 0xBF) | (low_power << 6));
270 }
271 mutex_unlock(&data->update_lock);
272
273 return count;
274}
275
276
277static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0);
278static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_max, 0);
279static SENSOR_DEVICE_ATTR_RW(temp1_min, temp_min, 0);
280static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1);
281static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_max, 1);
282static SENSOR_DEVICE_ATTR_RW(temp2_min, temp_min, 1);
283static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 6);
284static SENSOR_DEVICE_ATTR_RO(temp1_min_alarm, alarm, 5);
285static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 4);
286static SENSOR_DEVICE_ATTR_RO(temp2_min_alarm, alarm, 3);
287static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 2);
288
289static DEVICE_ATTR_RO(alarms);
290static DEVICE_ATTR_RW(low_power);
291
292static struct attribute *adm1021_attributes[] = {
293 &sensor_dev_attr_temp1_max.dev_attr.attr,
294 &sensor_dev_attr_temp1_input.dev_attr.attr,
295 &sensor_dev_attr_temp2_max.dev_attr.attr,
296 &sensor_dev_attr_temp2_input.dev_attr.attr,
297 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
298 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
299 &sensor_dev_attr_temp2_fault.dev_attr.attr,
300 &dev_attr_alarms.attr,
301 &dev_attr_low_power.attr,
302 NULL
303};
304
305static const struct attribute_group adm1021_group = {
306 .attrs = adm1021_attributes,
307};
308
309static struct attribute *adm1021_min_attributes[] = {
310 &sensor_dev_attr_temp1_min.dev_attr.attr,
311 &sensor_dev_attr_temp2_min.dev_attr.attr,
312 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
313 &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
314 NULL
315};
316
317static const struct attribute_group adm1021_min_group = {
318 .attrs = adm1021_min_attributes,
319};
320
321/* Return 0 if detection is successful, -ENODEV otherwise */
322static int adm1021_detect(struct i2c_client *client,
323 struct i2c_board_info *info)
324{
325 struct i2c_adapter *adapter = client->adapter;
326 const char *type_name;
327 int reg, conv_rate, status, config, man_id, dev_id;
328
329 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
330 pr_debug("detect failed, smbus byte data not supported!\n");
331 return -ENODEV;
332 }
333
334 status = i2c_smbus_read_byte_data(client, ADM1021_REG_STATUS);
335 conv_rate = i2c_smbus_read_byte_data(client,
336 ADM1021_REG_CONV_RATE_R);
337 config = i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R);
338
339 /* Check unused bits */
340 if ((status & 0x03) || (config & 0x3F) || (conv_rate & 0xF8)) {
341 pr_debug("detect failed, chip not detected!\n");
342 return -ENODEV;
343 }
344
345 /* Determine the chip type. */
346 man_id = i2c_smbus_read_byte_data(client, ADM1021_REG_MAN_ID);
347 dev_id = i2c_smbus_read_byte_data(client, ADM1021_REG_DEV_ID);
348
349 if (man_id < 0 || dev_id < 0)
350 return -ENODEV;
351
352 if (man_id == 0x4d && dev_id == 0x01) {
353 /*
354 * dev_id 0x01 matches MAX6680, MAX6695, MAX6696, and possibly
355 * others. Read register which is unsupported on MAX1617 but
356 * exists on all those chips and compare with the dev_id
357 * register. If it matches, it may be a MAX1617A.
358 */
359 reg = i2c_smbus_read_byte_data(client,
360 ADM1023_REG_REM_TEMP_PREC);
361 if (reg != dev_id)
362 return -ENODEV;
363 type_name = "max1617a";
364 } else if (man_id == 0x41) {
365 if ((dev_id & 0xF0) == 0x30)
366 type_name = "adm1023";
367 else if ((dev_id & 0xF0) == 0x00)
368 type_name = "adm1021";
369 else
370 return -ENODEV;
371 } else if (man_id == 0x49)
372 type_name = "thmc10";
373 else if (man_id == 0x23)
374 type_name = "gl523sm";
375 else if (man_id == 0x54)
376 type_name = "mc1066";
377 else {
378 int lte, rte, lhi, rhi, llo, rlo;
379
380 /* extra checks for LM84 and MAX1617 to avoid misdetections */
381
382 llo = i2c_smbus_read_byte_data(client, ADM1021_REG_THYST_R(0));
383 rlo = i2c_smbus_read_byte_data(client, ADM1021_REG_THYST_R(1));
384
385 /* fail if any of the additional register reads failed */
386 if (llo < 0 || rlo < 0)
387 return -ENODEV;
388
389 lte = i2c_smbus_read_byte_data(client, ADM1021_REG_TEMP(0));
390 rte = i2c_smbus_read_byte_data(client, ADM1021_REG_TEMP(1));
391 lhi = i2c_smbus_read_byte_data(client, ADM1021_REG_TOS_R(0));
392 rhi = i2c_smbus_read_byte_data(client, ADM1021_REG_TOS_R(1));
393
394 /*
395 * Fail for negative temperatures and negative high limits.
396 * This check also catches read errors on the tested registers.
397 */
398 if ((s8)lte < 0 || (s8)rte < 0 || (s8)lhi < 0 || (s8)rhi < 0)
399 return -ENODEV;
400
401 /* fail if all registers hold the same value */
402 if (lte == rte && lte == lhi && lte == rhi && lte == llo
403 && lte == rlo)
404 return -ENODEV;
405
406 /*
407 * LM84 Mfr ID is in a different place,
408 * and it has more unused bits. Registers at 0xfe and 0xff
409 * are undefined and return the most recently read value,
410 * here the value of the configuration register.
411 */
412 if (conv_rate == 0x00
413 && man_id == config && dev_id == config
414 && (config & 0x7F) == 0x00
415 && (status & 0xAB) == 0x00) {
416 type_name = "lm84";
417 } else {
418 if ((config & 0x3f) || (status & 0x03))
419 return -ENODEV;
420 /* fail if low limits are larger than high limits */
421 if ((s8)llo > lhi || (s8)rlo > rhi)
422 return -ENODEV;
423 type_name = "max1617";
424 }
425 }
426
427 pr_debug("Detected chip %s at adapter %d, address 0x%02x.\n",
428 type_name, i2c_adapter_id(adapter), client->addr);
429 strscpy(info->type, type_name, I2C_NAME_SIZE);
430
431 return 0;
432}
433
434static void adm1021_init_client(struct i2c_client *client)
435{
436 /* Enable ADC and disable suspend mode */
437 i2c_smbus_write_byte_data(client, ADM1021_REG_CONFIG_W,
438 i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R) & 0xBF);
439 /* Set Conversion rate to 1/sec (this can be tinkered with) */
440 i2c_smbus_write_byte_data(client, ADM1021_REG_CONV_RATE_W, 0x04);
441}
442
443static const struct i2c_device_id adm1021_id[];
444
445static int adm1021_probe(struct i2c_client *client)
446{
447 struct device *dev = &client->dev;
448 struct adm1021_data *data;
449 struct device *hwmon_dev;
450
451 data = devm_kzalloc(dev, sizeof(struct adm1021_data), GFP_KERNEL);
452 if (!data)
453 return -ENOMEM;
454
455 data->client = client;
456 data->type = i2c_match_id(adm1021_id, client)->driver_data;
457 mutex_init(&data->update_lock);
458
459 /* Initialize the ADM1021 chip */
460 if (data->type != lm84 && !read_only)
461 adm1021_init_client(client);
462
463 data->groups[0] = &adm1021_group;
464 if (data->type != lm84)
465 data->groups[1] = &adm1021_min_group;
466
467 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
468 data, data->groups);
469
470 return PTR_ERR_OR_ZERO(hwmon_dev);
471}
472
473static const struct i2c_device_id adm1021_id[] = {
474 { "adm1021", adm1021 },
475 { "adm1023", adm1023 },
476 { "max1617", max1617 },
477 { "max1617a", max1617a },
478 { "thmc10", thmc10 },
479 { "lm84", lm84 },
480 { "gl523sm", gl523sm },
481 { "mc1066", mc1066 },
482 { }
483};
484MODULE_DEVICE_TABLE(i2c, adm1021_id);
485
486static struct i2c_driver adm1021_driver = {
487 .class = I2C_CLASS_HWMON,
488 .driver = {
489 .name = "adm1021",
490 },
491 .probe_new = adm1021_probe,
492 .id_table = adm1021_id,
493 .detect = adm1021_detect,
494 .address_list = normal_i2c,
495};
496
497module_i2c_driver(adm1021_driver);
498
499MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
500 "Philip Edelbrock <phil@netroedge.com>");
501MODULE_DESCRIPTION("adm1021 driver");
502MODULE_LICENSE("GPL");
503
504module_param(read_only, bool, 0);
505MODULE_PARM_DESC(read_only, "Don't set any values, read only mode");
1/*
2 * adm1021.c - Part of lm_sensors, Linux kernel modules for hardware
3 * monitoring
4 * Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> and
5 * Philip Edelbrock <phil@netroedge.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 */
21
22#include <linux/module.h>
23#include <linux/init.h>
24#include <linux/slab.h>
25#include <linux/jiffies.h>
26#include <linux/i2c.h>
27#include <linux/hwmon.h>
28#include <linux/hwmon-sysfs.h>
29#include <linux/err.h>
30#include <linux/mutex.h>
31
32
33/* Addresses to scan */
34static const unsigned short normal_i2c[] = {
35 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
36
37enum chips {
38 adm1021, adm1023, max1617, max1617a, thmc10, lm84, gl523sm, mc1066 };
39
40/* adm1021 constants specified below */
41
42/* The adm1021 registers */
43/* Read-only */
44/* For nr in 0-1 */
45#define ADM1021_REG_TEMP(nr) (nr)
46#define ADM1021_REG_STATUS 0x02
47/* 0x41 = AD, 0x49 = TI, 0x4D = Maxim, 0x23 = Genesys , 0x54 = Onsemi */
48#define ADM1021_REG_MAN_ID 0xFE
49/* ADM1021 = 0x0X, ADM1023 = 0x3X */
50#define ADM1021_REG_DEV_ID 0xFF
51/* These use different addresses for reading/writing */
52#define ADM1021_REG_CONFIG_R 0x03
53#define ADM1021_REG_CONFIG_W 0x09
54#define ADM1021_REG_CONV_RATE_R 0x04
55#define ADM1021_REG_CONV_RATE_W 0x0A
56/* These are for the ADM1023's additional precision on the remote temp sensor */
57#define ADM1023_REG_REM_TEMP_PREC 0x10
58#define ADM1023_REG_REM_OFFSET 0x11
59#define ADM1023_REG_REM_OFFSET_PREC 0x12
60#define ADM1023_REG_REM_TOS_PREC 0x13
61#define ADM1023_REG_REM_THYST_PREC 0x14
62/* limits */
63/* For nr in 0-1 */
64#define ADM1021_REG_TOS_R(nr) (0x05 + 2 * (nr))
65#define ADM1021_REG_TOS_W(nr) (0x0B + 2 * (nr))
66#define ADM1021_REG_THYST_R(nr) (0x06 + 2 * (nr))
67#define ADM1021_REG_THYST_W(nr) (0x0C + 2 * (nr))
68/* write-only */
69#define ADM1021_REG_ONESHOT 0x0F
70
71/* Initial values */
72
73/*
74 * Note: Even though I left the low and high limits named os and hyst,
75 * they don't quite work like a thermostat the way the LM75 does. I.e.,
76 * a lower temp than THYST actually triggers an alarm instead of
77 * clearing it. Weird, ey? --Phil
78 */
79
80/* Each client has this additional data */
81struct adm1021_data {
82 struct i2c_client *client;
83 enum chips type;
84
85 const struct attribute_group *groups[3];
86
87 struct mutex update_lock;
88 char valid; /* !=0 if following fields are valid */
89 char low_power; /* !=0 if device in low power mode */
90 unsigned long last_updated; /* In jiffies */
91
92 int temp_max[2]; /* Register values */
93 int temp_min[2];
94 int temp[2];
95 u8 alarms;
96 /* Special values for ADM1023 only */
97 u8 remote_temp_offset;
98 u8 remote_temp_offset_prec;
99};
100
101static int adm1021_probe(struct i2c_client *client,
102 const struct i2c_device_id *id);
103static int adm1021_detect(struct i2c_client *client,
104 struct i2c_board_info *info);
105static void adm1021_init_client(struct i2c_client *client);
106static struct adm1021_data *adm1021_update_device(struct device *dev);
107
108/* (amalysh) read only mode, otherwise any limit's writing confuse BIOS */
109static bool read_only;
110
111
112static const struct i2c_device_id adm1021_id[] = {
113 { "adm1021", adm1021 },
114 { "adm1023", adm1023 },
115 { "max1617", max1617 },
116 { "max1617a", max1617a },
117 { "thmc10", thmc10 },
118 { "lm84", lm84 },
119 { "gl523sm", gl523sm },
120 { "mc1066", mc1066 },
121 { }
122};
123MODULE_DEVICE_TABLE(i2c, adm1021_id);
124
125/* This is the driver that will be inserted */
126static struct i2c_driver adm1021_driver = {
127 .class = I2C_CLASS_HWMON,
128 .driver = {
129 .name = "adm1021",
130 },
131 .probe = adm1021_probe,
132 .id_table = adm1021_id,
133 .detect = adm1021_detect,
134 .address_list = normal_i2c,
135};
136
137static ssize_t show_temp(struct device *dev,
138 struct device_attribute *devattr, char *buf)
139{
140 int index = to_sensor_dev_attr(devattr)->index;
141 struct adm1021_data *data = adm1021_update_device(dev);
142
143 return sprintf(buf, "%d\n", data->temp[index]);
144}
145
146static ssize_t show_temp_max(struct device *dev,
147 struct device_attribute *devattr, char *buf)
148{
149 int index = to_sensor_dev_attr(devattr)->index;
150 struct adm1021_data *data = adm1021_update_device(dev);
151
152 return sprintf(buf, "%d\n", data->temp_max[index]);
153}
154
155static ssize_t show_temp_min(struct device *dev,
156 struct device_attribute *devattr, char *buf)
157{
158 int index = to_sensor_dev_attr(devattr)->index;
159 struct adm1021_data *data = adm1021_update_device(dev);
160
161 return sprintf(buf, "%d\n", data->temp_min[index]);
162}
163
164static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
165 char *buf)
166{
167 int index = to_sensor_dev_attr(attr)->index;
168 struct adm1021_data *data = adm1021_update_device(dev);
169 return sprintf(buf, "%u\n", (data->alarms >> index) & 1);
170}
171
172static ssize_t show_alarms(struct device *dev,
173 struct device_attribute *attr,
174 char *buf)
175{
176 struct adm1021_data *data = adm1021_update_device(dev);
177 return sprintf(buf, "%u\n", data->alarms);
178}
179
180static ssize_t set_temp_max(struct device *dev,
181 struct device_attribute *devattr,
182 const char *buf, size_t count)
183{
184 int index = to_sensor_dev_attr(devattr)->index;
185 struct adm1021_data *data = dev_get_drvdata(dev);
186 struct i2c_client *client = data->client;
187 long temp;
188 int err;
189
190 err = kstrtol(buf, 10, &temp);
191 if (err)
192 return err;
193 temp /= 1000;
194
195 mutex_lock(&data->update_lock);
196 data->temp_max[index] = clamp_val(temp, -128, 127);
197 if (!read_only)
198 i2c_smbus_write_byte_data(client, ADM1021_REG_TOS_W(index),
199 data->temp_max[index]);
200 mutex_unlock(&data->update_lock);
201
202 return count;
203}
204
205static ssize_t set_temp_min(struct device *dev,
206 struct device_attribute *devattr,
207 const char *buf, size_t count)
208{
209 int index = to_sensor_dev_attr(devattr)->index;
210 struct adm1021_data *data = dev_get_drvdata(dev);
211 struct i2c_client *client = data->client;
212 long temp;
213 int err;
214
215 err = kstrtol(buf, 10, &temp);
216 if (err)
217 return err;
218 temp /= 1000;
219
220 mutex_lock(&data->update_lock);
221 data->temp_min[index] = clamp_val(temp, -128, 127);
222 if (!read_only)
223 i2c_smbus_write_byte_data(client, ADM1021_REG_THYST_W(index),
224 data->temp_min[index]);
225 mutex_unlock(&data->update_lock);
226
227 return count;
228}
229
230static ssize_t show_low_power(struct device *dev,
231 struct device_attribute *devattr, char *buf)
232{
233 struct adm1021_data *data = adm1021_update_device(dev);
234 return sprintf(buf, "%d\n", data->low_power);
235}
236
237static ssize_t set_low_power(struct device *dev,
238 struct device_attribute *devattr,
239 const char *buf, size_t count)
240{
241 struct adm1021_data *data = dev_get_drvdata(dev);
242 struct i2c_client *client = data->client;
243 char low_power;
244 unsigned long val;
245 int err;
246
247 err = kstrtoul(buf, 10, &val);
248 if (err)
249 return err;
250 low_power = val != 0;
251
252 mutex_lock(&data->update_lock);
253 if (low_power != data->low_power) {
254 int config = i2c_smbus_read_byte_data(
255 client, ADM1021_REG_CONFIG_R);
256 data->low_power = low_power;
257 i2c_smbus_write_byte_data(client, ADM1021_REG_CONFIG_W,
258 (config & 0xBF) | (low_power << 6));
259 }
260 mutex_unlock(&data->update_lock);
261
262 return count;
263}
264
265
266static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
267static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max,
268 set_temp_max, 0);
269static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp_min,
270 set_temp_min, 0);
271static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
272static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_max,
273 set_temp_max, 1);
274static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp_min,
275 set_temp_min, 1);
276static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
277static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 5);
278static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
279static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3);
280static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
281
282static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
283static DEVICE_ATTR(low_power, S_IWUSR | S_IRUGO, show_low_power, set_low_power);
284
285static struct attribute *adm1021_attributes[] = {
286 &sensor_dev_attr_temp1_max.dev_attr.attr,
287 &sensor_dev_attr_temp1_input.dev_attr.attr,
288 &sensor_dev_attr_temp2_max.dev_attr.attr,
289 &sensor_dev_attr_temp2_input.dev_attr.attr,
290 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
291 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
292 &sensor_dev_attr_temp2_fault.dev_attr.attr,
293 &dev_attr_alarms.attr,
294 &dev_attr_low_power.attr,
295 NULL
296};
297
298static const struct attribute_group adm1021_group = {
299 .attrs = adm1021_attributes,
300};
301
302static struct attribute *adm1021_min_attributes[] = {
303 &sensor_dev_attr_temp1_min.dev_attr.attr,
304 &sensor_dev_attr_temp2_min.dev_attr.attr,
305 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
306 &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
307 NULL
308};
309
310static const struct attribute_group adm1021_min_group = {
311 .attrs = adm1021_min_attributes,
312};
313
314/* Return 0 if detection is successful, -ENODEV otherwise */
315static int adm1021_detect(struct i2c_client *client,
316 struct i2c_board_info *info)
317{
318 struct i2c_adapter *adapter = client->adapter;
319 const char *type_name;
320 int conv_rate, status, config, man_id, dev_id;
321
322 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
323 pr_debug("detect failed, smbus byte data not supported!\n");
324 return -ENODEV;
325 }
326
327 status = i2c_smbus_read_byte_data(client, ADM1021_REG_STATUS);
328 conv_rate = i2c_smbus_read_byte_data(client,
329 ADM1021_REG_CONV_RATE_R);
330 config = i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R);
331
332 /* Check unused bits */
333 if ((status & 0x03) || (config & 0x3F) || (conv_rate & 0xF8)) {
334 pr_debug("detect failed, chip not detected!\n");
335 return -ENODEV;
336 }
337
338 /* Determine the chip type. */
339 man_id = i2c_smbus_read_byte_data(client, ADM1021_REG_MAN_ID);
340 dev_id = i2c_smbus_read_byte_data(client, ADM1021_REG_DEV_ID);
341
342 if (man_id < 0 || dev_id < 0)
343 return -ENODEV;
344
345 if (man_id == 0x4d && dev_id == 0x01)
346 type_name = "max1617a";
347 else if (man_id == 0x41) {
348 if ((dev_id & 0xF0) == 0x30)
349 type_name = "adm1023";
350 else if ((dev_id & 0xF0) == 0x00)
351 type_name = "adm1021";
352 else
353 return -ENODEV;
354 } else if (man_id == 0x49)
355 type_name = "thmc10";
356 else if (man_id == 0x23)
357 type_name = "gl523sm";
358 else if (man_id == 0x54)
359 type_name = "mc1066";
360 else {
361 int lte, rte, lhi, rhi, llo, rlo;
362
363 /* extra checks for LM84 and MAX1617 to avoid misdetections */
364
365 llo = i2c_smbus_read_byte_data(client, ADM1021_REG_THYST_R(0));
366 rlo = i2c_smbus_read_byte_data(client, ADM1021_REG_THYST_R(1));
367
368 /* fail if any of the additional register reads failed */
369 if (llo < 0 || rlo < 0)
370 return -ENODEV;
371
372 lte = i2c_smbus_read_byte_data(client, ADM1021_REG_TEMP(0));
373 rte = i2c_smbus_read_byte_data(client, ADM1021_REG_TEMP(1));
374 lhi = i2c_smbus_read_byte_data(client, ADM1021_REG_TOS_R(0));
375 rhi = i2c_smbus_read_byte_data(client, ADM1021_REG_TOS_R(1));
376
377 /*
378 * Fail for negative temperatures and negative high limits.
379 * This check also catches read errors on the tested registers.
380 */
381 if ((s8)lte < 0 || (s8)rte < 0 || (s8)lhi < 0 || (s8)rhi < 0)
382 return -ENODEV;
383
384 /* fail if all registers hold the same value */
385 if (lte == rte && lte == lhi && lte == rhi && lte == llo
386 && lte == rlo)
387 return -ENODEV;
388
389 /*
390 * LM84 Mfr ID is in a different place,
391 * and it has more unused bits.
392 */
393 if (conv_rate == 0x00
394 && (config & 0x7F) == 0x00
395 && (status & 0xAB) == 0x00) {
396 type_name = "lm84";
397 } else {
398 /* fail if low limits are larger than high limits */
399 if ((s8)llo > lhi || (s8)rlo > rhi)
400 return -ENODEV;
401 type_name = "max1617";
402 }
403 }
404
405 pr_debug("Detected chip %s at adapter %d, address 0x%02x.\n",
406 type_name, i2c_adapter_id(adapter), client->addr);
407 strlcpy(info->type, type_name, I2C_NAME_SIZE);
408
409 return 0;
410}
411
412static int adm1021_probe(struct i2c_client *client,
413 const struct i2c_device_id *id)
414{
415 struct device *dev = &client->dev;
416 struct adm1021_data *data;
417 struct device *hwmon_dev;
418
419 data = devm_kzalloc(dev, sizeof(struct adm1021_data), GFP_KERNEL);
420 if (!data)
421 return -ENOMEM;
422
423 data->client = client;
424 data->type = id->driver_data;
425 mutex_init(&data->update_lock);
426
427 /* Initialize the ADM1021 chip */
428 if (data->type != lm84 && !read_only)
429 adm1021_init_client(client);
430
431 data->groups[0] = &adm1021_group;
432 if (data->type != lm84)
433 data->groups[1] = &adm1021_min_group;
434
435 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
436 data, data->groups);
437
438 return PTR_ERR_OR_ZERO(hwmon_dev);
439}
440
441static void adm1021_init_client(struct i2c_client *client)
442{
443 /* Enable ADC and disable suspend mode */
444 i2c_smbus_write_byte_data(client, ADM1021_REG_CONFIG_W,
445 i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R) & 0xBF);
446 /* Set Conversion rate to 1/sec (this can be tinkered with) */
447 i2c_smbus_write_byte_data(client, ADM1021_REG_CONV_RATE_W, 0x04);
448}
449
450static struct adm1021_data *adm1021_update_device(struct device *dev)
451{
452 struct adm1021_data *data = dev_get_drvdata(dev);
453 struct i2c_client *client = data->client;
454
455 mutex_lock(&data->update_lock);
456
457 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
458 || !data->valid) {
459 int i;
460
461 dev_dbg(dev, "Starting adm1021 update\n");
462
463 for (i = 0; i < 2; i++) {
464 data->temp[i] = 1000 *
465 (s8) i2c_smbus_read_byte_data(
466 client, ADM1021_REG_TEMP(i));
467 data->temp_max[i] = 1000 *
468 (s8) i2c_smbus_read_byte_data(
469 client, ADM1021_REG_TOS_R(i));
470 if (data->type != lm84) {
471 data->temp_min[i] = 1000 *
472 (s8) i2c_smbus_read_byte_data(client,
473 ADM1021_REG_THYST_R(i));
474 }
475 }
476 data->alarms = i2c_smbus_read_byte_data(client,
477 ADM1021_REG_STATUS) & 0x7c;
478 if (data->type == adm1023) {
479 /*
480 * The ADM1023 provides 3 extra bits of precision for
481 * the remote sensor in extra registers.
482 */
483 data->temp[1] += 125 * (i2c_smbus_read_byte_data(
484 client, ADM1023_REG_REM_TEMP_PREC) >> 5);
485 data->temp_max[1] += 125 * (i2c_smbus_read_byte_data(
486 client, ADM1023_REG_REM_TOS_PREC) >> 5);
487 data->temp_min[1] += 125 * (i2c_smbus_read_byte_data(
488 client, ADM1023_REG_REM_THYST_PREC) >> 5);
489 data->remote_temp_offset =
490 i2c_smbus_read_byte_data(client,
491 ADM1023_REG_REM_OFFSET);
492 data->remote_temp_offset_prec =
493 i2c_smbus_read_byte_data(client,
494 ADM1023_REG_REM_OFFSET_PREC);
495 }
496 data->last_updated = jiffies;
497 data->valid = 1;
498 }
499
500 mutex_unlock(&data->update_lock);
501
502 return data;
503}
504
505module_i2c_driver(adm1021_driver);
506
507MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
508 "Philip Edelbrock <phil@netroedge.com>");
509MODULE_DESCRIPTION("adm1021 driver");
510MODULE_LICENSE("GPL");
511
512module_param(read_only, bool, 0);
513MODULE_PARM_DESC(read_only, "Don't set any values, read only mode");