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1da177e4 LT |
1 | /* |
2 | * lm90.c - Part of lm_sensors, Linux kernel modules for hardware | |
3 | * monitoring | |
6388a388 | 4 | * Copyright (C) 2003-2008 Jean Delvare <khali@linux-fr.org> |
1da177e4 LT |
5 | * |
6 | * Based on the lm83 driver. The LM90 is a sensor chip made by National | |
7 | * Semiconductor. It reports up to two temperatures (its own plus up to | |
8 | * one external one) with a 0.125 deg resolution (1 deg for local | |
9 | * temperature) and a 3-4 deg accuracy. Complete datasheet can be | |
10 | * obtained from National's website at: | |
11 | * http://www.national.com/pf/LM/LM90.html | |
12 | * | |
13 | * This driver also supports the LM89 and LM99, two other sensor chips | |
14 | * made by National Semiconductor. Both have an increased remote | |
15 | * temperature measurement accuracy (1 degree), and the LM99 | |
16 | * additionally shifts remote temperatures (measured and limits) by 16 | |
17 | * degrees, which allows for higher temperatures measurement. The | |
18 | * driver doesn't handle it since it can be done easily in user-space. | |
19 | * Complete datasheets can be obtained from National's website at: | |
20 | * http://www.national.com/pf/LM/LM89.html | |
21 | * http://www.national.com/pf/LM/LM99.html | |
44bbe87e | 22 | * Note that there is no way to differentiate between both chips. |
1da177e4 LT |
23 | * |
24 | * This driver also supports the LM86, another sensor chip made by | |
25 | * National Semiconductor. It is exactly similar to the LM90 except it | |
26 | * has a higher accuracy. | |
27 | * Complete datasheet can be obtained from National's website at: | |
28 | * http://www.national.com/pf/LM/LM86.html | |
29 | * | |
30 | * This driver also supports the ADM1032, a sensor chip made by Analog | |
31 | * Devices. That chip is similar to the LM90, with a few differences | |
32 | * that are not handled by this driver. Complete datasheet can be | |
33 | * obtained from Analog's website at: | |
90209b42 | 34 | * http://www.analog.com/en/prod/0,2877,ADM1032,00.html |
1da177e4 LT |
35 | * Among others, it has a higher accuracy than the LM90, much like the |
36 | * LM86 does. | |
37 | * | |
38 | * This driver also supports the MAX6657, MAX6658 and MAX6659 sensor | |
39 | * chips made by Maxim. These chips are similar to the LM86. Complete | |
40 | * datasheet can be obtained at Maxim's website at: | |
41 | * http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2578 | |
44bbe87e | 42 | * Note that there is no easy way to differentiate between the three |
1da177e4 | 43 | * variants. The extra address and features of the MAX6659 are not |
69f2f96d JD |
44 | * supported by this driver. These chips lack the remote temperature |
45 | * offset feature. | |
1da177e4 | 46 | * |
32c82a93 RB |
47 | * This driver also supports the MAX6680 and MAX6681, two other sensor |
48 | * chips made by Maxim. These are quite similar to the other Maxim | |
49 | * chips. Complete datasheet can be obtained at: | |
50 | * http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3370 | |
51 | * The MAX6680 and MAX6681 only differ in the pinout so they can be | |
52 | * treated identically. | |
53 | * | |
1da177e4 LT |
54 | * This driver also supports the ADT7461 chip from Analog Devices but |
55 | * only in its "compatability mode". If an ADT7461 chip is found but | |
56 | * is configured in non-compatible mode (where its temperature | |
57 | * register values are decoded differently) it is ignored by this | |
58 | * driver. Complete datasheet can be obtained from Analog's website | |
59 | * at: | |
90209b42 | 60 | * http://www.analog.com/en/prod/0,2877,ADT7461,00.html |
1da177e4 LT |
61 | * |
62 | * Since the LM90 was the first chipset supported by this driver, most | |
63 | * comments will refer to this chipset, but are actually general and | |
64 | * concern all supported chipsets, unless mentioned otherwise. | |
65 | * | |
66 | * This program is free software; you can redistribute it and/or modify | |
67 | * it under the terms of the GNU General Public License as published by | |
68 | * the Free Software Foundation; either version 2 of the License, or | |
69 | * (at your option) any later version. | |
70 | * | |
71 | * This program is distributed in the hope that it will be useful, | |
72 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
73 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
74 | * GNU General Public License for more details. | |
75 | * | |
76 | * You should have received a copy of the GNU General Public License | |
77 | * along with this program; if not, write to the Free Software | |
78 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
79 | */ | |
80 | ||
1da177e4 LT |
81 | #include <linux/module.h> |
82 | #include <linux/init.h> | |
83 | #include <linux/slab.h> | |
84 | #include <linux/jiffies.h> | |
85 | #include <linux/i2c.h> | |
10c08f81 | 86 | #include <linux/hwmon-sysfs.h> |
943b0830 MH |
87 | #include <linux/hwmon.h> |
88 | #include <linux/err.h> | |
9a61bf63 | 89 | #include <linux/mutex.h> |
0e39e01c | 90 | #include <linux/sysfs.h> |
1da177e4 LT |
91 | |
92 | /* | |
93 | * Addresses to scan | |
94 | * Address is fully defined internally and cannot be changed except for | |
32c82a93 | 95 | * MAX6659, MAX6680 and MAX6681. |
90209b42 JD |
96 | * LM86, LM89, LM90, LM99, ADM1032, ADM1032-1, ADT7461, MAX6657 and MAX6658 |
97 | * have address 0x4c. | |
98 | * ADM1032-2, ADT7461-2, LM89-1, and LM99-1 have address 0x4d. | |
1da177e4 | 99 | * MAX6659 can have address 0x4c, 0x4d or 0x4e (unsupported). |
32c82a93 RB |
100 | * MAX6680 and MAX6681 can have address 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, |
101 | * 0x4c, 0x4d or 0x4e. | |
1da177e4 LT |
102 | */ |
103 | ||
25e9c86d MH |
104 | static const unsigned short normal_i2c[] = { |
105 | 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END }; | |
1da177e4 LT |
106 | |
107 | /* | |
108 | * Insmod parameters | |
109 | */ | |
110 | ||
32c82a93 | 111 | I2C_CLIENT_INSMOD_7(lm90, adm1032, lm99, lm86, max6657, adt7461, max6680); |
1da177e4 LT |
112 | |
113 | /* | |
114 | * The LM90 registers | |
115 | */ | |
116 | ||
117 | #define LM90_REG_R_MAN_ID 0xFE | |
118 | #define LM90_REG_R_CHIP_ID 0xFF | |
119 | #define LM90_REG_R_CONFIG1 0x03 | |
120 | #define LM90_REG_W_CONFIG1 0x09 | |
121 | #define LM90_REG_R_CONFIG2 0xBF | |
122 | #define LM90_REG_W_CONFIG2 0xBF | |
123 | #define LM90_REG_R_CONVRATE 0x04 | |
124 | #define LM90_REG_W_CONVRATE 0x0A | |
125 | #define LM90_REG_R_STATUS 0x02 | |
126 | #define LM90_REG_R_LOCAL_TEMP 0x00 | |
127 | #define LM90_REG_R_LOCAL_HIGH 0x05 | |
128 | #define LM90_REG_W_LOCAL_HIGH 0x0B | |
129 | #define LM90_REG_R_LOCAL_LOW 0x06 | |
130 | #define LM90_REG_W_LOCAL_LOW 0x0C | |
131 | #define LM90_REG_R_LOCAL_CRIT 0x20 | |
132 | #define LM90_REG_W_LOCAL_CRIT 0x20 | |
133 | #define LM90_REG_R_REMOTE_TEMPH 0x01 | |
134 | #define LM90_REG_R_REMOTE_TEMPL 0x10 | |
135 | #define LM90_REG_R_REMOTE_OFFSH 0x11 | |
136 | #define LM90_REG_W_REMOTE_OFFSH 0x11 | |
137 | #define LM90_REG_R_REMOTE_OFFSL 0x12 | |
138 | #define LM90_REG_W_REMOTE_OFFSL 0x12 | |
139 | #define LM90_REG_R_REMOTE_HIGHH 0x07 | |
140 | #define LM90_REG_W_REMOTE_HIGHH 0x0D | |
141 | #define LM90_REG_R_REMOTE_HIGHL 0x13 | |
142 | #define LM90_REG_W_REMOTE_HIGHL 0x13 | |
143 | #define LM90_REG_R_REMOTE_LOWH 0x08 | |
144 | #define LM90_REG_W_REMOTE_LOWH 0x0E | |
145 | #define LM90_REG_R_REMOTE_LOWL 0x14 | |
146 | #define LM90_REG_W_REMOTE_LOWL 0x14 | |
147 | #define LM90_REG_R_REMOTE_CRIT 0x19 | |
148 | #define LM90_REG_W_REMOTE_CRIT 0x19 | |
149 | #define LM90_REG_R_TCRIT_HYST 0x21 | |
150 | #define LM90_REG_W_TCRIT_HYST 0x21 | |
151 | ||
152 | /* | |
153 | * Conversions and various macros | |
154 | * For local temperatures and limits, critical limits and the hysteresis | |
44bbe87e | 155 | * value, the LM90 uses signed 8-bit values with LSB = 1 degree Celsius. |
1da177e4 | 156 | * For remote temperatures and limits, it uses signed 11-bit values with |
44bbe87e | 157 | * LSB = 0.125 degree Celsius, left-justified in 16-bit registers. |
1da177e4 LT |
158 | */ |
159 | ||
160 | #define TEMP1_FROM_REG(val) ((val) * 1000) | |
161 | #define TEMP1_TO_REG(val) ((val) <= -128000 ? -128 : \ | |
162 | (val) >= 127000 ? 127 : \ | |
163 | (val) < 0 ? ((val) - 500) / 1000 : \ | |
164 | ((val) + 500) / 1000) | |
165 | #define TEMP2_FROM_REG(val) ((val) / 32 * 125) | |
166 | #define TEMP2_TO_REG(val) ((val) <= -128000 ? 0x8000 : \ | |
167 | (val) >= 127875 ? 0x7FE0 : \ | |
168 | (val) < 0 ? ((val) - 62) / 125 * 32 : \ | |
169 | ((val) + 62) / 125 * 32) | |
170 | #define HYST_TO_REG(val) ((val) <= 0 ? 0 : (val) >= 30500 ? 31 : \ | |
171 | ((val) + 500) / 1000) | |
172 | ||
173 | /* | |
174 | * ADT7461 is almost identical to LM90 except that attempts to write | |
175 | * values that are outside the range 0 < temp < 127 are treated as | |
176 | * the boundary value. | |
177 | */ | |
178 | ||
179 | #define TEMP1_TO_REG_ADT7461(val) ((val) <= 0 ? 0 : \ | |
180 | (val) >= 127000 ? 127 : \ | |
181 | ((val) + 500) / 1000) | |
182 | #define TEMP2_TO_REG_ADT7461(val) ((val) <= 0 ? 0 : \ | |
183 | (val) >= 127750 ? 0x7FC0 : \ | |
184 | ((val) + 125) / 250 * 64) | |
185 | ||
186 | /* | |
187 | * Functions declaration | |
188 | */ | |
189 | ||
9b0e8526 JD |
190 | static int lm90_detect(struct i2c_client *client, int kind, |
191 | struct i2c_board_info *info); | |
192 | static int lm90_probe(struct i2c_client *client, | |
193 | const struct i2c_device_id *id); | |
1da177e4 | 194 | static void lm90_init_client(struct i2c_client *client); |
9b0e8526 | 195 | static int lm90_remove(struct i2c_client *client); |
1da177e4 LT |
196 | static struct lm90_data *lm90_update_device(struct device *dev); |
197 | ||
198 | /* | |
199 | * Driver data (common to all clients) | |
200 | */ | |
201 | ||
9b0e8526 JD |
202 | static const struct i2c_device_id lm90_id[] = { |
203 | { "adm1032", adm1032 }, | |
204 | { "adt7461", adt7461 }, | |
205 | { "lm90", lm90 }, | |
206 | { "lm86", lm86 }, | |
207 | { "lm89", lm99 }, | |
208 | { "lm99", lm99 }, /* Missing temperature offset */ | |
209 | { "max6657", max6657 }, | |
210 | { "max6658", max6657 }, | |
211 | { "max6659", max6657 }, | |
212 | { "max6680", max6680 }, | |
213 | { "max6681", max6680 }, | |
214 | { } | |
215 | }; | |
216 | MODULE_DEVICE_TABLE(i2c, lm90_id); | |
217 | ||
1da177e4 | 218 | static struct i2c_driver lm90_driver = { |
9b0e8526 | 219 | .class = I2C_CLASS_HWMON, |
cdaf7934 | 220 | .driver = { |
cdaf7934 LR |
221 | .name = "lm90", |
222 | }, | |
9b0e8526 JD |
223 | .probe = lm90_probe, |
224 | .remove = lm90_remove, | |
225 | .id_table = lm90_id, | |
226 | .detect = lm90_detect, | |
227 | .address_data = &addr_data, | |
1da177e4 LT |
228 | }; |
229 | ||
230 | /* | |
231 | * Client data (each client gets its own) | |
232 | */ | |
233 | ||
234 | struct lm90_data { | |
1beeffe4 | 235 | struct device *hwmon_dev; |
9a61bf63 | 236 | struct mutex update_lock; |
1da177e4 LT |
237 | char valid; /* zero until following fields are valid */ |
238 | unsigned long last_updated; /* in jiffies */ | |
239 | int kind; | |
240 | ||
241 | /* registers values */ | |
30d7394b JD |
242 | s8 temp8[5]; /* 0: local input |
243 | 1: local low limit | |
244 | 2: local high limit | |
245 | 3: local critical limit | |
246 | 4: remote critical limit */ | |
69f2f96d | 247 | s16 temp11[4]; /* 0: remote input |
30d7394b | 248 | 1: remote low limit |
69f2f96d JD |
249 | 2: remote high limit |
250 | 3: remote offset (except max6657) */ | |
1da177e4 LT |
251 | u8 temp_hyst; |
252 | u8 alarms; /* bitvector */ | |
253 | }; | |
254 | ||
255 | /* | |
256 | * Sysfs stuff | |
257 | */ | |
258 | ||
30d7394b JD |
259 | static ssize_t show_temp8(struct device *dev, struct device_attribute *devattr, |
260 | char *buf) | |
261 | { | |
262 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
263 | struct lm90_data *data = lm90_update_device(dev); | |
264 | return sprintf(buf, "%d\n", TEMP1_FROM_REG(data->temp8[attr->index])); | |
265 | } | |
266 | ||
267 | static ssize_t set_temp8(struct device *dev, struct device_attribute *devattr, | |
268 | const char *buf, size_t count) | |
269 | { | |
270 | static const u8 reg[4] = { | |
271 | LM90_REG_W_LOCAL_LOW, | |
272 | LM90_REG_W_LOCAL_HIGH, | |
273 | LM90_REG_W_LOCAL_CRIT, | |
274 | LM90_REG_W_REMOTE_CRIT, | |
275 | }; | |
276 | ||
277 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
278 | struct i2c_client *client = to_i2c_client(dev); | |
279 | struct lm90_data *data = i2c_get_clientdata(client); | |
280 | long val = simple_strtol(buf, NULL, 10); | |
281 | int nr = attr->index; | |
282 | ||
9a61bf63 | 283 | mutex_lock(&data->update_lock); |
30d7394b JD |
284 | if (data->kind == adt7461) |
285 | data->temp8[nr] = TEMP1_TO_REG_ADT7461(val); | |
286 | else | |
287 | data->temp8[nr] = TEMP1_TO_REG(val); | |
288 | i2c_smbus_write_byte_data(client, reg[nr - 1], data->temp8[nr]); | |
9a61bf63 | 289 | mutex_unlock(&data->update_lock); |
30d7394b | 290 | return count; |
1da177e4 | 291 | } |
30d7394b JD |
292 | |
293 | static ssize_t show_temp11(struct device *dev, struct device_attribute *devattr, | |
294 | char *buf) | |
295 | { | |
296 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
297 | struct lm90_data *data = lm90_update_device(dev); | |
298 | return sprintf(buf, "%d\n", TEMP2_FROM_REG(data->temp11[attr->index])); | |
1da177e4 | 299 | } |
30d7394b JD |
300 | |
301 | static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr, | |
302 | const char *buf, size_t count) | |
303 | { | |
69f2f96d | 304 | static const u8 reg[6] = { |
30d7394b JD |
305 | LM90_REG_W_REMOTE_LOWH, |
306 | LM90_REG_W_REMOTE_LOWL, | |
307 | LM90_REG_W_REMOTE_HIGHH, | |
308 | LM90_REG_W_REMOTE_HIGHL, | |
69f2f96d JD |
309 | LM90_REG_W_REMOTE_OFFSH, |
310 | LM90_REG_W_REMOTE_OFFSL, | |
30d7394b JD |
311 | }; |
312 | ||
313 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
314 | struct i2c_client *client = to_i2c_client(dev); | |
315 | struct lm90_data *data = i2c_get_clientdata(client); | |
316 | long val = simple_strtol(buf, NULL, 10); | |
317 | int nr = attr->index; | |
318 | ||
9a61bf63 | 319 | mutex_lock(&data->update_lock); |
30d7394b JD |
320 | if (data->kind == adt7461) |
321 | data->temp11[nr] = TEMP2_TO_REG_ADT7461(val); | |
322 | else | |
323 | data->temp11[nr] = TEMP2_TO_REG(val); | |
324 | i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2], | |
325 | data->temp11[nr] >> 8); | |
326 | i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2 + 1], | |
327 | data->temp11[nr] & 0xff); | |
9a61bf63 | 328 | mutex_unlock(&data->update_lock); |
30d7394b | 329 | return count; |
1da177e4 | 330 | } |
30d7394b JD |
331 | |
332 | static ssize_t show_temphyst(struct device *dev, struct device_attribute *devattr, | |
333 | char *buf) | |
334 | { | |
335 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
336 | struct lm90_data *data = lm90_update_device(dev); | |
337 | return sprintf(buf, "%d\n", TEMP1_FROM_REG(data->temp8[attr->index]) | |
338 | - TEMP1_FROM_REG(data->temp_hyst)); | |
1da177e4 | 339 | } |
1da177e4 | 340 | |
30d7394b JD |
341 | static ssize_t set_temphyst(struct device *dev, struct device_attribute *dummy, |
342 | const char *buf, size_t count) | |
1da177e4 LT |
343 | { |
344 | struct i2c_client *client = to_i2c_client(dev); | |
345 | struct lm90_data *data = i2c_get_clientdata(client); | |
346 | long val = simple_strtol(buf, NULL, 10); | |
347 | long hyst; | |
348 | ||
9a61bf63 | 349 | mutex_lock(&data->update_lock); |
30d7394b | 350 | hyst = TEMP1_FROM_REG(data->temp8[3]) - val; |
1da177e4 LT |
351 | i2c_smbus_write_byte_data(client, LM90_REG_W_TCRIT_HYST, |
352 | HYST_TO_REG(hyst)); | |
9a61bf63 | 353 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
354 | return count; |
355 | } | |
356 | ||
30d7394b JD |
357 | static ssize_t show_alarms(struct device *dev, struct device_attribute *dummy, |
358 | char *buf) | |
1da177e4 LT |
359 | { |
360 | struct lm90_data *data = lm90_update_device(dev); | |
361 | return sprintf(buf, "%d\n", data->alarms); | |
362 | } | |
363 | ||
2d45771e JD |
364 | static ssize_t show_alarm(struct device *dev, struct device_attribute |
365 | *devattr, char *buf) | |
366 | { | |
367 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
368 | struct lm90_data *data = lm90_update_device(dev); | |
369 | int bitnr = attr->index; | |
370 | ||
371 | return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1); | |
372 | } | |
373 | ||
30d7394b JD |
374 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp8, NULL, 0); |
375 | static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp11, NULL, 0); | |
376 | static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp8, | |
377 | set_temp8, 1); | |
378 | static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp11, | |
379 | set_temp11, 1); | |
380 | static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp8, | |
381 | set_temp8, 2); | |
382 | static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp11, | |
383 | set_temp11, 2); | |
384 | static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp8, | |
385 | set_temp8, 3); | |
386 | static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp8, | |
387 | set_temp8, 4); | |
388 | static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temphyst, | |
389 | set_temphyst, 3); | |
390 | static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temphyst, NULL, 4); | |
69f2f96d JD |
391 | static SENSOR_DEVICE_ATTR(temp2_offset, S_IWUSR | S_IRUGO, show_temp11, |
392 | set_temp11, 3); | |
2d45771e JD |
393 | |
394 | /* Individual alarm files */ | |
395 | static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 0); | |
396 | static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1); | |
7817a39e | 397 | static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2); |
2d45771e JD |
398 | static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3); |
399 | static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4); | |
400 | static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 5); | |
401 | static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6); | |
402 | /* Raw alarm file for compatibility */ | |
1da177e4 LT |
403 | static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); |
404 | ||
0e39e01c JD |
405 | static struct attribute *lm90_attributes[] = { |
406 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
407 | &sensor_dev_attr_temp2_input.dev_attr.attr, | |
408 | &sensor_dev_attr_temp1_min.dev_attr.attr, | |
409 | &sensor_dev_attr_temp2_min.dev_attr.attr, | |
410 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
411 | &sensor_dev_attr_temp2_max.dev_attr.attr, | |
412 | &sensor_dev_attr_temp1_crit.dev_attr.attr, | |
413 | &sensor_dev_attr_temp2_crit.dev_attr.attr, | |
414 | &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr, | |
415 | &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr, | |
416 | ||
417 | &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, | |
418 | &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr, | |
7817a39e | 419 | &sensor_dev_attr_temp2_fault.dev_attr.attr, |
0e39e01c JD |
420 | &sensor_dev_attr_temp2_min_alarm.dev_attr.attr, |
421 | &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, | |
422 | &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, | |
423 | &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, | |
424 | &dev_attr_alarms.attr, | |
425 | NULL | |
426 | }; | |
427 | ||
428 | static const struct attribute_group lm90_group = { | |
429 | .attrs = lm90_attributes, | |
430 | }; | |
431 | ||
c3df5806 JD |
432 | /* pec used for ADM1032 only */ |
433 | static ssize_t show_pec(struct device *dev, struct device_attribute *dummy, | |
434 | char *buf) | |
435 | { | |
436 | struct i2c_client *client = to_i2c_client(dev); | |
437 | return sprintf(buf, "%d\n", !!(client->flags & I2C_CLIENT_PEC)); | |
438 | } | |
439 | ||
440 | static ssize_t set_pec(struct device *dev, struct device_attribute *dummy, | |
441 | const char *buf, size_t count) | |
442 | { | |
443 | struct i2c_client *client = to_i2c_client(dev); | |
444 | long val = simple_strtol(buf, NULL, 10); | |
445 | ||
446 | switch (val) { | |
447 | case 0: | |
448 | client->flags &= ~I2C_CLIENT_PEC; | |
449 | break; | |
450 | case 1: | |
451 | client->flags |= I2C_CLIENT_PEC; | |
452 | break; | |
453 | default: | |
454 | return -EINVAL; | |
455 | } | |
456 | ||
457 | return count; | |
458 | } | |
459 | ||
460 | static DEVICE_ATTR(pec, S_IWUSR | S_IRUGO, show_pec, set_pec); | |
461 | ||
1da177e4 LT |
462 | /* |
463 | * Real code | |
464 | */ | |
465 | ||
c3df5806 | 466 | /* The ADM1032 supports PEC but not on write byte transactions, so we need |
0966415d | 467 | to explicitly ask for a transaction without PEC. */ |
c3df5806 JD |
468 | static inline s32 adm1032_write_byte(struct i2c_client *client, u8 value) |
469 | { | |
470 | return i2c_smbus_xfer(client->adapter, client->addr, | |
471 | client->flags & ~I2C_CLIENT_PEC, | |
472 | I2C_SMBUS_WRITE, value, I2C_SMBUS_BYTE, NULL); | |
473 | } | |
474 | ||
475 | /* It is assumed that client->update_lock is held (unless we are in | |
476 | detection or initialization steps). This matters when PEC is enabled, | |
477 | because we don't want the address pointer to change between the write | |
478 | byte and the read byte transactions. */ | |
8256fe0f JD |
479 | static int lm90_read_reg(struct i2c_client* client, u8 reg, u8 *value) |
480 | { | |
481 | int err; | |
482 | ||
c3df5806 JD |
483 | if (client->flags & I2C_CLIENT_PEC) { |
484 | err = adm1032_write_byte(client, reg); | |
485 | if (err >= 0) | |
486 | err = i2c_smbus_read_byte(client); | |
487 | } else | |
488 | err = i2c_smbus_read_byte_data(client, reg); | |
8256fe0f JD |
489 | |
490 | if (err < 0) { | |
491 | dev_warn(&client->dev, "Register %#02x read failed (%d)\n", | |
492 | reg, err); | |
493 | return err; | |
494 | } | |
495 | *value = err; | |
496 | ||
497 | return 0; | |
498 | } | |
499 | ||
9b0e8526 JD |
500 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
501 | static int lm90_detect(struct i2c_client *new_client, int kind, | |
502 | struct i2c_board_info *info) | |
1da177e4 | 503 | { |
9b0e8526 JD |
504 | struct i2c_adapter *adapter = new_client->adapter; |
505 | int address = new_client->addr; | |
1da177e4 LT |
506 | const char *name = ""; |
507 | ||
508 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
9b0e8526 | 509 | return -ENODEV; |
1da177e4 LT |
510 | |
511 | /* | |
512 | * Now we do the remaining detection. A negative kind means that | |
513 | * the driver was loaded with no force parameter (default), so we | |
514 | * must both detect and identify the chip. A zero kind means that | |
515 | * the driver was loaded with the force parameter, the detection | |
516 | * step shall be skipped. A positive kind means that the driver | |
517 | * was loaded with the force parameter and a given kind of chip is | |
518 | * requested, so both the detection and the identification steps | |
519 | * are skipped. | |
520 | */ | |
521 | ||
522 | /* Default to an LM90 if forced */ | |
523 | if (kind == 0) | |
524 | kind = lm90; | |
525 | ||
526 | if (kind < 0) { /* detection and identification */ | |
e0ae87a4 JD |
527 | int man_id, chip_id, reg_config1, reg_convrate; |
528 | ||
529 | if ((man_id = i2c_smbus_read_byte_data(new_client, | |
530 | LM90_REG_R_MAN_ID)) < 0 | |
531 | || (chip_id = i2c_smbus_read_byte_data(new_client, | |
532 | LM90_REG_R_CHIP_ID)) < 0 | |
533 | || (reg_config1 = i2c_smbus_read_byte_data(new_client, | |
534 | LM90_REG_R_CONFIG1)) < 0 | |
535 | || (reg_convrate = i2c_smbus_read_byte_data(new_client, | |
536 | LM90_REG_R_CONVRATE)) < 0) | |
9b0e8526 | 537 | return -ENODEV; |
1da177e4 | 538 | |
32c82a93 RB |
539 | if ((address == 0x4C || address == 0x4D) |
540 | && man_id == 0x01) { /* National Semiconductor */ | |
e0ae87a4 | 541 | int reg_config2; |
1da177e4 | 542 | |
e0ae87a4 JD |
543 | if ((reg_config2 = i2c_smbus_read_byte_data(new_client, |
544 | LM90_REG_R_CONFIG2)) < 0) | |
9b0e8526 | 545 | return -ENODEV; |
1da177e4 LT |
546 | |
547 | if ((reg_config1 & 0x2A) == 0x00 | |
548 | && (reg_config2 & 0xF8) == 0x00 | |
549 | && reg_convrate <= 0x09) { | |
550 | if (address == 0x4C | |
551 | && (chip_id & 0xF0) == 0x20) { /* LM90 */ | |
552 | kind = lm90; | |
553 | } else | |
554 | if ((chip_id & 0xF0) == 0x30) { /* LM89/LM99 */ | |
555 | kind = lm99; | |
556 | } else | |
557 | if (address == 0x4C | |
558 | && (chip_id & 0xF0) == 0x10) { /* LM86 */ | |
559 | kind = lm86; | |
560 | } | |
561 | } | |
562 | } else | |
32c82a93 RB |
563 | if ((address == 0x4C || address == 0x4D) |
564 | && man_id == 0x41) { /* Analog Devices */ | |
90209b42 | 565 | if ((chip_id & 0xF0) == 0x40 /* ADM1032 */ |
1da177e4 LT |
566 | && (reg_config1 & 0x3F) == 0x00 |
567 | && reg_convrate <= 0x0A) { | |
568 | kind = adm1032; | |
569 | } else | |
90209b42 | 570 | if (chip_id == 0x51 /* ADT7461 */ |
1da177e4 LT |
571 | && (reg_config1 & 0x1F) == 0x00 /* check compat mode */ |
572 | && reg_convrate <= 0x0A) { | |
573 | kind = adt7461; | |
574 | } | |
575 | } else | |
576 | if (man_id == 0x4D) { /* Maxim */ | |
577 | /* | |
32c82a93 RB |
578 | * The MAX6657, MAX6658 and MAX6659 do NOT have a |
579 | * chip_id register. Reading from that address will | |
580 | * return the last read value, which in our case is | |
581 | * those of the man_id register. Likewise, the config1 | |
582 | * register seems to lack a low nibble, so the value | |
583 | * will be those of the previous read, so in our case | |
584 | * those of the man_id register. | |
1da177e4 LT |
585 | */ |
586 | if (chip_id == man_id | |
f5744e37 | 587 | && (address == 0x4C || address == 0x4D) |
1da177e4 LT |
588 | && (reg_config1 & 0x1F) == (man_id & 0x0F) |
589 | && reg_convrate <= 0x09) { | |
590 | kind = max6657; | |
32c82a93 RB |
591 | } else |
592 | /* The chip_id register of the MAX6680 and MAX6681 | |
593 | * holds the revision of the chip. | |
594 | * the lowest bit of the config1 register is unused | |
595 | * and should return zero when read, so should the | |
596 | * second to last bit of config1 (software reset) | |
597 | */ | |
598 | if (chip_id == 0x01 | |
599 | && (reg_config1 & 0x03) == 0x00 | |
600 | && reg_convrate <= 0x07) { | |
601 | kind = max6680; | |
1da177e4 LT |
602 | } |
603 | } | |
604 | ||
605 | if (kind <= 0) { /* identification failed */ | |
606 | dev_info(&adapter->dev, | |
607 | "Unsupported chip (man_id=0x%02X, " | |
608 | "chip_id=0x%02X).\n", man_id, chip_id); | |
9b0e8526 | 609 | return -ENODEV; |
1da177e4 LT |
610 | } |
611 | } | |
612 | ||
9b0e8526 | 613 | /* Fill the i2c board info */ |
1da177e4 LT |
614 | if (kind == lm90) { |
615 | name = "lm90"; | |
616 | } else if (kind == adm1032) { | |
617 | name = "adm1032"; | |
c3df5806 JD |
618 | /* The ADM1032 supports PEC, but only if combined |
619 | transactions are not used. */ | |
620 | if (i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE)) | |
9b0e8526 | 621 | info->flags |= I2C_CLIENT_PEC; |
1da177e4 LT |
622 | } else if (kind == lm99) { |
623 | name = "lm99"; | |
624 | } else if (kind == lm86) { | |
625 | name = "lm86"; | |
626 | } else if (kind == max6657) { | |
627 | name = "max6657"; | |
32c82a93 RB |
628 | } else if (kind == max6680) { |
629 | name = "max6680"; | |
1da177e4 LT |
630 | } else if (kind == adt7461) { |
631 | name = "adt7461"; | |
632 | } | |
9b0e8526 JD |
633 | strlcpy(info->type, name, I2C_NAME_SIZE); |
634 | ||
635 | return 0; | |
636 | } | |
637 | ||
638 | static int lm90_probe(struct i2c_client *new_client, | |
639 | const struct i2c_device_id *id) | |
640 | { | |
641 | struct i2c_adapter *adapter = to_i2c_adapter(new_client->dev.parent); | |
642 | struct lm90_data *data; | |
643 | int err; | |
1da177e4 | 644 | |
9b0e8526 JD |
645 | data = kzalloc(sizeof(struct lm90_data), GFP_KERNEL); |
646 | if (!data) { | |
647 | err = -ENOMEM; | |
648 | goto exit; | |
649 | } | |
650 | i2c_set_clientdata(new_client, data); | |
9a61bf63 | 651 | mutex_init(&data->update_lock); |
1da177e4 | 652 | |
9b0e8526 JD |
653 | /* Set the device type */ |
654 | data->kind = id->driver_data; | |
655 | if (data->kind == adm1032) { | |
656 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE)) | |
657 | new_client->flags &= ~I2C_CLIENT_PEC; | |
658 | } | |
1da177e4 LT |
659 | |
660 | /* Initialize the LM90 chip */ | |
661 | lm90_init_client(new_client); | |
662 | ||
663 | /* Register sysfs hooks */ | |
0e39e01c | 664 | if ((err = sysfs_create_group(&new_client->dev.kobj, &lm90_group))) |
9b0e8526 | 665 | goto exit_free; |
0e39e01c JD |
666 | if (new_client->flags & I2C_CLIENT_PEC) { |
667 | if ((err = device_create_file(&new_client->dev, | |
668 | &dev_attr_pec))) | |
669 | goto exit_remove_files; | |
670 | } | |
69f2f96d JD |
671 | if (data->kind != max6657) { |
672 | if ((err = device_create_file(&new_client->dev, | |
673 | &sensor_dev_attr_temp2_offset.dev_attr))) | |
674 | goto exit_remove_files; | |
675 | } | |
0e39e01c | 676 | |
1beeffe4 TJ |
677 | data->hwmon_dev = hwmon_device_register(&new_client->dev); |
678 | if (IS_ERR(data->hwmon_dev)) { | |
679 | err = PTR_ERR(data->hwmon_dev); | |
0e39e01c | 680 | goto exit_remove_files; |
943b0830 MH |
681 | } |
682 | ||
1da177e4 LT |
683 | return 0; |
684 | ||
0e39e01c JD |
685 | exit_remove_files: |
686 | sysfs_remove_group(&new_client->dev.kobj, &lm90_group); | |
687 | device_remove_file(&new_client->dev, &dev_attr_pec); | |
1da177e4 LT |
688 | exit_free: |
689 | kfree(data); | |
690 | exit: | |
691 | return err; | |
692 | } | |
693 | ||
694 | static void lm90_init_client(struct i2c_client *client) | |
695 | { | |
32c82a93 RB |
696 | u8 config, config_orig; |
697 | struct lm90_data *data = i2c_get_clientdata(client); | |
1da177e4 LT |
698 | |
699 | /* | |
700 | * Start the conversions. | |
701 | */ | |
702 | i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE, | |
703 | 5); /* 2 Hz */ | |
8256fe0f JD |
704 | if (lm90_read_reg(client, LM90_REG_R_CONFIG1, &config) < 0) { |
705 | dev_warn(&client->dev, "Initialization failed!\n"); | |
706 | return; | |
707 | } | |
32c82a93 RB |
708 | config_orig = config; |
709 | ||
710 | /* | |
711 | * Put MAX6680/MAX8881 into extended resolution (bit 0x10, | |
712 | * 0.125 degree resolution) and range (0x08, extend range | |
713 | * to -64 degree) mode for the remote temperature sensor. | |
714 | */ | |
715 | if (data->kind == max6680) { | |
716 | config |= 0x18; | |
717 | } | |
718 | ||
719 | config &= 0xBF; /* run */ | |
720 | if (config != config_orig) /* Only write if changed */ | |
721 | i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, config); | |
1da177e4 LT |
722 | } |
723 | ||
9b0e8526 | 724 | static int lm90_remove(struct i2c_client *client) |
1da177e4 | 725 | { |
943b0830 | 726 | struct lm90_data *data = i2c_get_clientdata(client); |
1da177e4 | 727 | |
1beeffe4 | 728 | hwmon_device_unregister(data->hwmon_dev); |
0e39e01c JD |
729 | sysfs_remove_group(&client->dev.kobj, &lm90_group); |
730 | device_remove_file(&client->dev, &dev_attr_pec); | |
69f2f96d JD |
731 | if (data->kind != max6657) |
732 | device_remove_file(&client->dev, | |
733 | &sensor_dev_attr_temp2_offset.dev_attr); | |
943b0830 | 734 | |
943b0830 | 735 | kfree(data); |
1da177e4 LT |
736 | return 0; |
737 | } | |
738 | ||
6388a388 JD |
739 | static int lm90_read16(struct i2c_client *client, u8 regh, u8 regl, u16 *value) |
740 | { | |
741 | int err; | |
742 | u8 oldh, newh, l; | |
743 | ||
744 | /* | |
745 | * There is a trick here. We have to read two registers to have the | |
746 | * sensor temperature, but we have to beware a conversion could occur | |
747 | * inbetween the readings. The datasheet says we should either use | |
748 | * the one-shot conversion register, which we don't want to do | |
749 | * (disables hardware monitoring) or monitor the busy bit, which is | |
750 | * impossible (we can't read the values and monitor that bit at the | |
751 | * exact same time). So the solution used here is to read the high | |
752 | * byte once, then the low byte, then the high byte again. If the new | |
753 | * high byte matches the old one, then we have a valid reading. Else | |
754 | * we have to read the low byte again, and now we believe we have a | |
755 | * correct reading. | |
756 | */ | |
757 | if ((err = lm90_read_reg(client, regh, &oldh)) | |
758 | || (err = lm90_read_reg(client, regl, &l)) | |
759 | || (err = lm90_read_reg(client, regh, &newh))) | |
760 | return err; | |
761 | if (oldh != newh) { | |
762 | err = lm90_read_reg(client, regl, &l); | |
763 | if (err) | |
764 | return err; | |
765 | } | |
766 | *value = (newh << 8) | l; | |
767 | ||
768 | return 0; | |
769 | } | |
770 | ||
1da177e4 LT |
771 | static struct lm90_data *lm90_update_device(struct device *dev) |
772 | { | |
773 | struct i2c_client *client = to_i2c_client(dev); | |
774 | struct lm90_data *data = i2c_get_clientdata(client); | |
775 | ||
9a61bf63 | 776 | mutex_lock(&data->update_lock); |
1da177e4 LT |
777 | |
778 | if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) { | |
6388a388 | 779 | u8 h, l; |
1da177e4 LT |
780 | |
781 | dev_dbg(&client->dev, "Updating lm90 data.\n"); | |
8256fe0f JD |
782 | lm90_read_reg(client, LM90_REG_R_LOCAL_TEMP, &data->temp8[0]); |
783 | lm90_read_reg(client, LM90_REG_R_LOCAL_LOW, &data->temp8[1]); | |
784 | lm90_read_reg(client, LM90_REG_R_LOCAL_HIGH, &data->temp8[2]); | |
785 | lm90_read_reg(client, LM90_REG_R_LOCAL_CRIT, &data->temp8[3]); | |
786 | lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT, &data->temp8[4]); | |
787 | lm90_read_reg(client, LM90_REG_R_TCRIT_HYST, &data->temp_hyst); | |
1da177e4 | 788 | |
6388a388 JD |
789 | lm90_read16(client, LM90_REG_R_REMOTE_TEMPH, |
790 | LM90_REG_R_REMOTE_TEMPL, &data->temp11[0]); | |
791 | ||
792 | if (lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &h) == 0 | |
8256fe0f | 793 | && lm90_read_reg(client, LM90_REG_R_REMOTE_LOWL, &l) == 0) |
6388a388 JD |
794 | data->temp11[1] = (h << 8) | l; |
795 | if (lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &h) == 0 | |
8256fe0f | 796 | && lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHL, &l) == 0) |
6388a388 | 797 | data->temp11[2] = (h << 8) | l; |
69f2f96d JD |
798 | if (data->kind != max6657) { |
799 | if (lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSH, | |
6388a388 | 800 | &h) == 0 |
69f2f96d JD |
801 | && lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSL, |
802 | &l) == 0) | |
6388a388 | 803 | data->temp11[3] = (h << 8) | l; |
69f2f96d | 804 | } |
8256fe0f | 805 | lm90_read_reg(client, LM90_REG_R_STATUS, &data->alarms); |
1da177e4 LT |
806 | |
807 | data->last_updated = jiffies; | |
808 | data->valid = 1; | |
809 | } | |
810 | ||
9a61bf63 | 811 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
812 | |
813 | return data; | |
814 | } | |
815 | ||
816 | static int __init sensors_lm90_init(void) | |
817 | { | |
818 | return i2c_add_driver(&lm90_driver); | |
819 | } | |
820 | ||
821 | static void __exit sensors_lm90_exit(void) | |
822 | { | |
823 | i2c_del_driver(&lm90_driver); | |
824 | } | |
825 | ||
826 | MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>"); | |
827 | MODULE_DESCRIPTION("LM90/ADM1032 driver"); | |
828 | MODULE_LICENSE("GPL"); | |
829 | ||
830 | module_init(sensors_lm90_init); | |
831 | module_exit(sensors_lm90_exit); |