1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * adm1029.c - Part of lm_sensors, Linux kernel modules for hardware monitoring
4 *
5 * Copyright (C) 2006 Corentin LABBE <clabbe.montjoie@gmail.com>
6 *
7 * Based on LM83 Driver by Jean Delvare <jdelvare@suse.de>
8 *
9 * Give only processor, motherboard temperatures and fan tachs
10 * Very rare chip please let me know if you use it
11 *
12 * http://www.analog.com/UploadedFiles/Data_Sheets/ADM1029.pdf
13 */
14
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/slab.h>
18 #include <linux/jiffies.h>
19 #include <linux/i2c.h>
20 #include <linux/hwmon-sysfs.h>
21 #include <linux/hwmon.h>
22 #include <linux/err.h>
23 #include <linux/mutex.h>
24
25 /*
26 * Addresses to scan
27 */
28
29 static const unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d,
30 0x2e, 0x2f, I2C_CLIENT_END
31 };
32
33 /*
34 * The ADM1029 registers
35 * Manufacturer ID is 0x41 for Analog Devices
36 */
37
38 #define ADM1029_REG_MAN_ID 0x0D
39 #define ADM1029_REG_CHIP_ID 0x0E
40 #define ADM1029_REG_CONFIG 0x01
41 #define ADM1029_REG_NB_FAN_SUPPORT 0x02
42
43 #define ADM1029_REG_TEMP_DEVICES_INSTALLED 0x06
44
45 #define ADM1029_REG_LOCAL_TEMP 0xA0
46 #define ADM1029_REG_REMOTE1_TEMP 0xA1
47 #define ADM1029_REG_REMOTE2_TEMP 0xA2
48
49 #define ADM1029_REG_LOCAL_TEMP_HIGH 0x90
50 #define ADM1029_REG_REMOTE1_TEMP_HIGH 0x91
51 #define ADM1029_REG_REMOTE2_TEMP_HIGH 0x92
52
53 #define ADM1029_REG_LOCAL_TEMP_LOW 0x98
54 #define ADM1029_REG_REMOTE1_TEMP_LOW 0x99
55 #define ADM1029_REG_REMOTE2_TEMP_LOW 0x9A
56
57 #define ADM1029_REG_FAN1 0x70
58 #define ADM1029_REG_FAN2 0x71
59
60 #define ADM1029_REG_FAN1_MIN 0x78
61 #define ADM1029_REG_FAN2_MIN 0x79
62
63 #define ADM1029_REG_FAN1_CONFIG 0x68
64 #define ADM1029_REG_FAN2_CONFIG 0x69
65
66 #define TEMP_FROM_REG(val) ((val) * 1000)
67
68 #define DIV_FROM_REG(val) (1 << (((val) >> 6) - 1))
69
70 /* Registers to be checked by adm1029_update_device() */
71 static const u8 ADM1029_REG_TEMP[] = {
72 ADM1029_REG_LOCAL_TEMP,
73 ADM1029_REG_REMOTE1_TEMP,
74 ADM1029_REG_REMOTE2_TEMP,
75 ADM1029_REG_LOCAL_TEMP_HIGH,
76 ADM1029_REG_REMOTE1_TEMP_HIGH,
77 ADM1029_REG_REMOTE2_TEMP_HIGH,
78 ADM1029_REG_LOCAL_TEMP_LOW,
79 ADM1029_REG_REMOTE1_TEMP_LOW,
80 ADM1029_REG_REMOTE2_TEMP_LOW,
81 };
82
83 static const u8 ADM1029_REG_FAN[] = {
84 ADM1029_REG_FAN1,
85 ADM1029_REG_FAN2,
86 ADM1029_REG_FAN1_MIN,
87 ADM1029_REG_FAN2_MIN,
88 };
89
90 static const u8 ADM1029_REG_FAN_DIV[] = {
91 ADM1029_REG_FAN1_CONFIG,
92 ADM1029_REG_FAN2_CONFIG,
93 };
94
95 /*
96 * Client data (each client gets its own)
97 */
98
99 struct adm1029_data {
100 struct i2c_client *client;
101 struct mutex update_lock; /* protect register access */
102 bool valid; /* false until following fields are valid */
103 unsigned long last_updated; /* in jiffies */
104
105 /* registers values, signed for temperature, unsigned for other stuff */
106 s8 temp[ARRAY_SIZE(ADM1029_REG_TEMP)];
107 u8 fan[ARRAY_SIZE(ADM1029_REG_FAN)];
108 u8 fan_div[ARRAY_SIZE(ADM1029_REG_FAN_DIV)];
109 };
110
111 /*
112 * function that update the status of the chips (temperature for example)
113 */
adm1029_update_device(struct device * dev)114 static struct adm1029_data *adm1029_update_device(struct device *dev)
115 {
116 struct adm1029_data *data = dev_get_drvdata(dev);
117 struct i2c_client *client = data->client;
118
119 mutex_lock(&data->update_lock);
120 /*
121 * Use the "cache" Luke, don't recheck values
122 * if there are already checked not a long time later
123 */
124 if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
125 int nr;
126
127 dev_dbg(&client->dev, "Updating adm1029 data\n");
128
129 for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_TEMP); nr++) {
130 data->temp[nr] =
131 i2c_smbus_read_byte_data(client,
132 ADM1029_REG_TEMP[nr]);
133 }
134 for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_FAN); nr++) {
135 data->fan[nr] =
136 i2c_smbus_read_byte_data(client,
137 ADM1029_REG_FAN[nr]);
138 }
139 for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_FAN_DIV); nr++) {
140 data->fan_div[nr] =
141 i2c_smbus_read_byte_data(client,
142 ADM1029_REG_FAN_DIV[nr]);
143 }
144
145 data->last_updated = jiffies;
146 data->valid = true;
147 }
148
149 mutex_unlock(&data->update_lock);
150
151 return data;
152 }
153
154 /*
155 * Sysfs stuff
156 */
157
158 static ssize_t
temp_show(struct device * dev,struct device_attribute * devattr,char * buf)159 temp_show(struct device *dev, struct device_attribute *devattr, char *buf)
160 {
161 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
162 struct adm1029_data *data = adm1029_update_device(dev);
163
164 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
165 }
166
167 static ssize_t
fan_show(struct device * dev,struct device_attribute * devattr,char * buf)168 fan_show(struct device *dev, struct device_attribute *devattr, char *buf)
169 {
170 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
171 struct adm1029_data *data = adm1029_update_device(dev);
172 u16 val;
173
174 if (data->fan[attr->index] == 0 ||
175 (data->fan_div[attr->index] & 0xC0) == 0 ||
176 data->fan[attr->index] == 255) {
177 return sprintf(buf, "0\n");
178 }
179
180 val = 1880 * 120 / DIV_FROM_REG(data->fan_div[attr->index])
181 / data->fan[attr->index];
182 return sprintf(buf, "%d\n", val);
183 }
184
185 static ssize_t
fan_div_show(struct device * dev,struct device_attribute * devattr,char * buf)186 fan_div_show(struct device *dev, struct device_attribute *devattr, char *buf)
187 {
188 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
189 struct adm1029_data *data = adm1029_update_device(dev);
190
191 if ((data->fan_div[attr->index] & 0xC0) == 0)
192 return sprintf(buf, "0\n");
193 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index]));
194 }
195
fan_div_store(struct device * dev,struct device_attribute * devattr,const char * buf,size_t count)196 static ssize_t fan_div_store(struct device *dev,
197 struct device_attribute *devattr,
198 const char *buf, size_t count)
199 {
200 struct adm1029_data *data = dev_get_drvdata(dev);
201 struct i2c_client *client = data->client;
202 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
203 u8 reg;
204 long val;
205 int ret = kstrtol(buf, 10, &val);
206
207 if (ret < 0)
208 return ret;
209
210 mutex_lock(&data->update_lock);
211
212 /*Read actual config */
213 reg = i2c_smbus_read_byte_data(client,
214 ADM1029_REG_FAN_DIV[attr->index]);
215
216 switch (val) {
217 case 1:
218 val = 1;
219 break;
220 case 2:
221 val = 2;
222 break;
223 case 4:
224 val = 3;
225 break;
226 default:
227 mutex_unlock(&data->update_lock);
228 dev_err(&client->dev,
229 "fan_div value %ld not supported. Choose one of 1, 2 or 4!\n",
230 val);
231 return -EINVAL;
232 }
233 /* Update the value */
234 reg = (reg & 0x3F) | (val << 6);
235
236 /* Update the cache */
237 data->fan_div[attr->index] = reg;
238
239 /* Write value */
240 i2c_smbus_write_byte_data(client,
241 ADM1029_REG_FAN_DIV[attr->index], reg);
242 mutex_unlock(&data->update_lock);
243
244 return count;
245 }
246
247 /* Access rights on sysfs. */
248 static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0);
249 static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1);
250 static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 2);
251
252 static SENSOR_DEVICE_ATTR_RO(temp1_max, temp, 3);
253 static SENSOR_DEVICE_ATTR_RO(temp2_max, temp, 4);
254 static SENSOR_DEVICE_ATTR_RO(temp3_max, temp, 5);
255
256 static SENSOR_DEVICE_ATTR_RO(temp1_min, temp, 6);
257 static SENSOR_DEVICE_ATTR_RO(temp2_min, temp, 7);
258 static SENSOR_DEVICE_ATTR_RO(temp3_min, temp, 8);
259
260 static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0);
261 static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 1);
262
263 static SENSOR_DEVICE_ATTR_RO(fan1_min, fan, 2);
264 static SENSOR_DEVICE_ATTR_RO(fan2_min, fan, 3);
265
266 static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0);
267 static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1);
268
269 static struct attribute *adm1029_attrs[] = {
270 &sensor_dev_attr_temp1_input.dev_attr.attr,
271 &sensor_dev_attr_temp1_min.dev_attr.attr,
272 &sensor_dev_attr_temp1_max.dev_attr.attr,
273 &sensor_dev_attr_temp2_input.dev_attr.attr,
274 &sensor_dev_attr_temp2_min.dev_attr.attr,
275 &sensor_dev_attr_temp2_max.dev_attr.attr,
276 &sensor_dev_attr_temp3_input.dev_attr.attr,
277 &sensor_dev_attr_temp3_min.dev_attr.attr,
278 &sensor_dev_attr_temp3_max.dev_attr.attr,
279 &sensor_dev_attr_fan1_input.dev_attr.attr,
280 &sensor_dev_attr_fan2_input.dev_attr.attr,
281 &sensor_dev_attr_fan1_min.dev_attr.attr,
282 &sensor_dev_attr_fan2_min.dev_attr.attr,
283 &sensor_dev_attr_fan1_div.dev_attr.attr,
284 &sensor_dev_attr_fan2_div.dev_attr.attr,
285 NULL
286 };
287
288 ATTRIBUTE_GROUPS(adm1029);
289
290 /*
291 * Real code
292 */
293
294 /* Return 0 if detection is successful, -ENODEV otherwise */
adm1029_detect(struct i2c_client * client,struct i2c_board_info * info)295 static int adm1029_detect(struct i2c_client *client,
296 struct i2c_board_info *info)
297 {
298 struct i2c_adapter *adapter = client->adapter;
299 u8 man_id, chip_id, temp_devices_installed, nb_fan_support;
300
301 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
302 return -ENODEV;
303
304 /*
305 * ADM1029 doesn't have CHIP ID, check just MAN ID
306 * For better detection we check also ADM1029_TEMP_DEVICES_INSTALLED,
307 * ADM1029_REG_NB_FAN_SUPPORT and compare it with possible values
308 * documented
309 */
310
311 man_id = i2c_smbus_read_byte_data(client, ADM1029_REG_MAN_ID);
312 chip_id = i2c_smbus_read_byte_data(client, ADM1029_REG_CHIP_ID);
313 temp_devices_installed = i2c_smbus_read_byte_data(client,
314 ADM1029_REG_TEMP_DEVICES_INSTALLED);
315 nb_fan_support = i2c_smbus_read_byte_data(client,
316 ADM1029_REG_NB_FAN_SUPPORT);
317 /* 0x41 is Analog Devices */
318 if (man_id != 0x41 || (temp_devices_installed & 0xf9) != 0x01 ||
319 nb_fan_support != 0x03)
320 return -ENODEV;
321
322 if ((chip_id & 0xF0) != 0x00) {
323 /*
324 * There are no "official" CHIP ID, so actually
325 * we use Major/Minor revision for that
326 */
327 pr_info("Unknown major revision %x, please let us know\n",
328 chip_id);
329 return -ENODEV;
330 }
331
332 strscpy(info->type, "adm1029", I2C_NAME_SIZE);
333
334 return 0;
335 }
336
adm1029_init_client(struct i2c_client * client)337 static int adm1029_init_client(struct i2c_client *client)
338 {
339 u8 config;
340
341 config = i2c_smbus_read_byte_data(client, ADM1029_REG_CONFIG);
342 if ((config & 0x10) == 0) {
343 i2c_smbus_write_byte_data(client, ADM1029_REG_CONFIG,
344 config | 0x10);
345 }
346 /* recheck config */
347 config = i2c_smbus_read_byte_data(client, ADM1029_REG_CONFIG);
348 if ((config & 0x10) == 0) {
349 dev_err(&client->dev, "Initialization failed!\n");
350 return 0;
351 }
352 return 1;
353 }
354
adm1029_probe(struct i2c_client * client)355 static int adm1029_probe(struct i2c_client *client)
356 {
357 struct device *dev = &client->dev;
358 struct adm1029_data *data;
359 struct device *hwmon_dev;
360
361 data = devm_kzalloc(dev, sizeof(struct adm1029_data), GFP_KERNEL);
362 if (!data)
363 return -ENOMEM;
364
365 data->client = client;
366 mutex_init(&data->update_lock);
367
368 /*
369 * Initialize the ADM1029 chip
370 * Check config register
371 */
372 if (adm1029_init_client(client) == 0)
373 return -ENODEV;
374
375 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
376 data,
377 adm1029_groups);
378 return PTR_ERR_OR_ZERO(hwmon_dev);
379 }
380
381 static const struct i2c_device_id adm1029_id[] = {
382 { "adm1029", 0 },
383 { }
384 };
385 MODULE_DEVICE_TABLE(i2c, adm1029_id);
386
387 static struct i2c_driver adm1029_driver = {
388 .class = I2C_CLASS_HWMON,
389 .driver = {
390 .name = "adm1029",
391 },
392 .probe = adm1029_probe,
393 .id_table = adm1029_id,
394 .detect = adm1029_detect,
395 .address_list = normal_i2c,
396 };
397
398 module_i2c_driver(adm1029_driver);
399
400 MODULE_AUTHOR("Corentin LABBE <clabbe.montjoie@gmail.com>");
401 MODULE_DESCRIPTION("adm1029 driver");
402 MODULE_LICENSE("GPL v2");
403