xref: /linux/drivers/hwmon/adm1029.c (revision 02892f90a9851f508e557b3c75e93fc178310d5f)
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  */
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
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
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 	mutex_lock(&data->update_lock);
175 	if (data->fan[attr->index] == 0 ||
176 	    (data->fan_div[attr->index] & 0xC0) == 0 ||
177 	    data->fan[attr->index] == 255) {
178 		mutex_unlock(&data->update_lock);
179 		return sprintf(buf, "0\n");
180 	}
181 
182 	val = 1880 * 120 / DIV_FROM_REG(data->fan_div[attr->index])
183 	    / data->fan[attr->index];
184 	mutex_unlock(&data->update_lock);
185 	return sprintf(buf, "%d\n", val);
186 }
187 
188 static ssize_t
189 fan_div_show(struct device *dev, struct device_attribute *devattr, char *buf)
190 {
191 	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
192 	struct adm1029_data *data = adm1029_update_device(dev);
193 
194 	if ((data->fan_div[attr->index] & 0xC0) == 0)
195 		return sprintf(buf, "0\n");
196 	return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index]));
197 }
198 
199 static ssize_t fan_div_store(struct device *dev,
200 			     struct device_attribute *devattr,
201 			     const char *buf, size_t count)
202 {
203 	struct adm1029_data *data = dev_get_drvdata(dev);
204 	struct i2c_client *client = data->client;
205 	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
206 	u8 reg;
207 	long val;
208 	int ret = kstrtol(buf, 10, &val);
209 
210 	if (ret < 0)
211 		return ret;
212 
213 	mutex_lock(&data->update_lock);
214 
215 	/*Read actual config */
216 	reg = i2c_smbus_read_byte_data(client,
217 				       ADM1029_REG_FAN_DIV[attr->index]);
218 
219 	switch (val) {
220 	case 1:
221 		val = 1;
222 		break;
223 	case 2:
224 		val = 2;
225 		break;
226 	case 4:
227 		val = 3;
228 		break;
229 	default:
230 		mutex_unlock(&data->update_lock);
231 		dev_err(&client->dev,
232 			"fan_div value %ld not supported. Choose one of 1, 2 or 4!\n",
233 			val);
234 		return -EINVAL;
235 	}
236 	/* Update the value */
237 	reg = (reg & 0x3F) | (val << 6);
238 
239 	/* Update the cache */
240 	data->fan_div[attr->index] = reg;
241 
242 	/* Write value */
243 	i2c_smbus_write_byte_data(client,
244 				  ADM1029_REG_FAN_DIV[attr->index], reg);
245 	mutex_unlock(&data->update_lock);
246 
247 	return count;
248 }
249 
250 /* Access rights on sysfs. */
251 static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0);
252 static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1);
253 static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 2);
254 
255 static SENSOR_DEVICE_ATTR_RO(temp1_max, temp, 3);
256 static SENSOR_DEVICE_ATTR_RO(temp2_max, temp, 4);
257 static SENSOR_DEVICE_ATTR_RO(temp3_max, temp, 5);
258 
259 static SENSOR_DEVICE_ATTR_RO(temp1_min, temp, 6);
260 static SENSOR_DEVICE_ATTR_RO(temp2_min, temp, 7);
261 static SENSOR_DEVICE_ATTR_RO(temp3_min, temp, 8);
262 
263 static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0);
264 static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 1);
265 
266 static SENSOR_DEVICE_ATTR_RO(fan1_min, fan, 2);
267 static SENSOR_DEVICE_ATTR_RO(fan2_min, fan, 3);
268 
269 static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0);
270 static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1);
271 
272 static struct attribute *adm1029_attrs[] = {
273 	&sensor_dev_attr_temp1_input.dev_attr.attr,
274 	&sensor_dev_attr_temp1_min.dev_attr.attr,
275 	&sensor_dev_attr_temp1_max.dev_attr.attr,
276 	&sensor_dev_attr_temp2_input.dev_attr.attr,
277 	&sensor_dev_attr_temp2_min.dev_attr.attr,
278 	&sensor_dev_attr_temp2_max.dev_attr.attr,
279 	&sensor_dev_attr_temp3_input.dev_attr.attr,
280 	&sensor_dev_attr_temp3_min.dev_attr.attr,
281 	&sensor_dev_attr_temp3_max.dev_attr.attr,
282 	&sensor_dev_attr_fan1_input.dev_attr.attr,
283 	&sensor_dev_attr_fan2_input.dev_attr.attr,
284 	&sensor_dev_attr_fan1_min.dev_attr.attr,
285 	&sensor_dev_attr_fan2_min.dev_attr.attr,
286 	&sensor_dev_attr_fan1_div.dev_attr.attr,
287 	&sensor_dev_attr_fan2_div.dev_attr.attr,
288 	NULL
289 };
290 
291 ATTRIBUTE_GROUPS(adm1029);
292 
293 /*
294  * Real code
295  */
296 
297 /* Return 0 if detection is successful, -ENODEV otherwise */
298 static int adm1029_detect(struct i2c_client *client,
299 			  struct i2c_board_info *info)
300 {
301 	struct i2c_adapter *adapter = client->adapter;
302 	u8 man_id, chip_id, temp_devices_installed, nb_fan_support;
303 
304 	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
305 		return -ENODEV;
306 
307 	/*
308 	 * ADM1029 doesn't have CHIP ID, check just MAN ID
309 	 * For better detection we check also ADM1029_TEMP_DEVICES_INSTALLED,
310 	 * ADM1029_REG_NB_FAN_SUPPORT and compare it with possible values
311 	 * documented
312 	 */
313 
314 	man_id = i2c_smbus_read_byte_data(client, ADM1029_REG_MAN_ID);
315 	chip_id = i2c_smbus_read_byte_data(client, ADM1029_REG_CHIP_ID);
316 	temp_devices_installed = i2c_smbus_read_byte_data(client,
317 					ADM1029_REG_TEMP_DEVICES_INSTALLED);
318 	nb_fan_support = i2c_smbus_read_byte_data(client,
319 						  ADM1029_REG_NB_FAN_SUPPORT);
320 	/* 0x41 is Analog Devices */
321 	if (man_id != 0x41 || (temp_devices_installed & 0xf9) != 0x01 ||
322 	    nb_fan_support != 0x03)
323 		return -ENODEV;
324 
325 	if ((chip_id & 0xF0) != 0x00) {
326 		/*
327 		 * There are no "official" CHIP ID, so actually
328 		 * we use Major/Minor revision for that
329 		 */
330 		pr_info("Unknown major revision %x, please let us know\n",
331 			chip_id);
332 		return -ENODEV;
333 	}
334 
335 	strscpy(info->type, "adm1029", I2C_NAME_SIZE);
336 
337 	return 0;
338 }
339 
340 static int adm1029_init_client(struct i2c_client *client)
341 {
342 	u8 config;
343 
344 	config = i2c_smbus_read_byte_data(client, ADM1029_REG_CONFIG);
345 	if ((config & 0x10) == 0) {
346 		i2c_smbus_write_byte_data(client, ADM1029_REG_CONFIG,
347 					  config | 0x10);
348 	}
349 	/* recheck config */
350 	config = i2c_smbus_read_byte_data(client, ADM1029_REG_CONFIG);
351 	if ((config & 0x10) == 0) {
352 		dev_err(&client->dev, "Initialization failed!\n");
353 		return 0;
354 	}
355 	return 1;
356 }
357 
358 static int adm1029_probe(struct i2c_client *client)
359 {
360 	struct device *dev = &client->dev;
361 	struct adm1029_data *data;
362 	struct device *hwmon_dev;
363 
364 	data = devm_kzalloc(dev, sizeof(struct adm1029_data), GFP_KERNEL);
365 	if (!data)
366 		return -ENOMEM;
367 
368 	data->client = client;
369 	mutex_init(&data->update_lock);
370 
371 	/*
372 	 * Initialize the ADM1029 chip
373 	 * Check config register
374 	 */
375 	if (adm1029_init_client(client) == 0)
376 		return -ENODEV;
377 
378 	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
379 							   data,
380 							   adm1029_groups);
381 	return PTR_ERR_OR_ZERO(hwmon_dev);
382 }
383 
384 static const struct i2c_device_id adm1029_id[] = {
385 	{ "adm1029" },
386 	{ }
387 };
388 MODULE_DEVICE_TABLE(i2c, adm1029_id);
389 
390 static struct i2c_driver adm1029_driver = {
391 	.class		= I2C_CLASS_HWMON,
392 	.driver = {
393 		.name = "adm1029",
394 	},
395 	.probe		= adm1029_probe,
396 	.id_table	= adm1029_id,
397 	.detect		= adm1029_detect,
398 	.address_list	= normal_i2c,
399 };
400 
401 module_i2c_driver(adm1029_driver);
402 
403 MODULE_AUTHOR("Corentin LABBE <clabbe.montjoie@gmail.com>");
404 MODULE_DESCRIPTION("adm1029 driver");
405 MODULE_LICENSE("GPL v2");
406