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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 | |
a874a10c | 9 | * temperature) and a 3-4 deg accuracy. |
1da177e4 LT |
10 | * |
11 | * This driver also supports the LM89 and LM99, two other sensor chips | |
12 | * made by National Semiconductor. Both have an increased remote | |
13 | * temperature measurement accuracy (1 degree), and the LM99 | |
14 | * additionally shifts remote temperatures (measured and limits) by 16 | |
15 | * degrees, which allows for higher temperatures measurement. The | |
16 | * driver doesn't handle it since it can be done easily in user-space. | |
44bbe87e | 17 | * Note that there is no way to differentiate between both chips. |
1da177e4 LT |
18 | * |
19 | * This driver also supports the LM86, another sensor chip made by | |
20 | * National Semiconductor. It is exactly similar to the LM90 except it | |
21 | * has a higher accuracy. | |
1da177e4 LT |
22 | * |
23 | * This driver also supports the ADM1032, a sensor chip made by Analog | |
24 | * Devices. That chip is similar to the LM90, with a few differences | |
a874a10c JD |
25 | * that are not handled by this driver. Among others, it has a higher |
26 | * accuracy than the LM90, much like the LM86 does. | |
1da177e4 LT |
27 | * |
28 | * This driver also supports the MAX6657, MAX6658 and MAX6659 sensor | |
a874a10c | 29 | * chips made by Maxim. These chips are similar to the LM86. |
44bbe87e | 30 | * Note that there is no easy way to differentiate between the three |
1da177e4 | 31 | * variants. The extra address and features of the MAX6659 are not |
69f2f96d JD |
32 | * supported by this driver. These chips lack the remote temperature |
33 | * offset feature. | |
1da177e4 | 34 | * |
32c82a93 RB |
35 | * This driver also supports the MAX6680 and MAX6681, two other sensor |
36 | * chips made by Maxim. These are quite similar to the other Maxim | |
a874a10c JD |
37 | * chips. The MAX6680 and MAX6681 only differ in the pinout so they can |
38 | * be treated identically. | |
32c82a93 | 39 | * |
1da177e4 LT |
40 | * This driver also supports the ADT7461 chip from Analog Devices but |
41 | * only in its "compatability mode". If an ADT7461 chip is found but | |
42 | * is configured in non-compatible mode (where its temperature | |
43 | * register values are decoded differently) it is ignored by this | |
a874a10c | 44 | * driver. |
1da177e4 LT |
45 | * |
46 | * Since the LM90 was the first chipset supported by this driver, most | |
47 | * comments will refer to this chipset, but are actually general and | |
48 | * concern all supported chipsets, unless mentioned otherwise. | |
49 | * | |
50 | * This program is free software; you can redistribute it and/or modify | |
51 | * it under the terms of the GNU General Public License as published by | |
52 | * the Free Software Foundation; either version 2 of the License, or | |
53 | * (at your option) any later version. | |
54 | * | |
55 | * This program is distributed in the hope that it will be useful, | |
56 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
57 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
58 | * GNU General Public License for more details. | |
59 | * | |
60 | * You should have received a copy of the GNU General Public License | |
61 | * along with this program; if not, write to the Free Software | |
62 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
63 | */ | |
64 | ||
1da177e4 LT |
65 | #include <linux/module.h> |
66 | #include <linux/init.h> | |
67 | #include <linux/slab.h> | |
68 | #include <linux/jiffies.h> | |
69 | #include <linux/i2c.h> | |
10c08f81 | 70 | #include <linux/hwmon-sysfs.h> |
943b0830 MH |
71 | #include <linux/hwmon.h> |
72 | #include <linux/err.h> | |
9a61bf63 | 73 | #include <linux/mutex.h> |
0e39e01c | 74 | #include <linux/sysfs.h> |
1da177e4 LT |
75 | |
76 | /* | |
77 | * Addresses to scan | |
78 | * Address is fully defined internally and cannot be changed except for | |
32c82a93 | 79 | * MAX6659, MAX6680 and MAX6681. |
90209b42 JD |
80 | * LM86, LM89, LM90, LM99, ADM1032, ADM1032-1, ADT7461, MAX6657 and MAX6658 |
81 | * have address 0x4c. | |
82 | * ADM1032-2, ADT7461-2, LM89-1, and LM99-1 have address 0x4d. | |
1da177e4 | 83 | * MAX6659 can have address 0x4c, 0x4d or 0x4e (unsupported). |
32c82a93 RB |
84 | * MAX6680 and MAX6681 can have address 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, |
85 | * 0x4c, 0x4d or 0x4e. | |
1da177e4 LT |
86 | */ |
87 | ||
25e9c86d MH |
88 | static const unsigned short normal_i2c[] = { |
89 | 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END }; | |
1da177e4 LT |
90 | |
91 | /* | |
92 | * Insmod parameters | |
93 | */ | |
94 | ||
32c82a93 | 95 | I2C_CLIENT_INSMOD_7(lm90, adm1032, lm99, lm86, max6657, adt7461, max6680); |
1da177e4 LT |
96 | |
97 | /* | |
98 | * The LM90 registers | |
99 | */ | |
100 | ||
101 | #define LM90_REG_R_MAN_ID 0xFE | |
102 | #define LM90_REG_R_CHIP_ID 0xFF | |
103 | #define LM90_REG_R_CONFIG1 0x03 | |
104 | #define LM90_REG_W_CONFIG1 0x09 | |
105 | #define LM90_REG_R_CONFIG2 0xBF | |
106 | #define LM90_REG_W_CONFIG2 0xBF | |
107 | #define LM90_REG_R_CONVRATE 0x04 | |
108 | #define LM90_REG_W_CONVRATE 0x0A | |
109 | #define LM90_REG_R_STATUS 0x02 | |
110 | #define LM90_REG_R_LOCAL_TEMP 0x00 | |
111 | #define LM90_REG_R_LOCAL_HIGH 0x05 | |
112 | #define LM90_REG_W_LOCAL_HIGH 0x0B | |
113 | #define LM90_REG_R_LOCAL_LOW 0x06 | |
114 | #define LM90_REG_W_LOCAL_LOW 0x0C | |
115 | #define LM90_REG_R_LOCAL_CRIT 0x20 | |
116 | #define LM90_REG_W_LOCAL_CRIT 0x20 | |
117 | #define LM90_REG_R_REMOTE_TEMPH 0x01 | |
118 | #define LM90_REG_R_REMOTE_TEMPL 0x10 | |
119 | #define LM90_REG_R_REMOTE_OFFSH 0x11 | |
120 | #define LM90_REG_W_REMOTE_OFFSH 0x11 | |
121 | #define LM90_REG_R_REMOTE_OFFSL 0x12 | |
122 | #define LM90_REG_W_REMOTE_OFFSL 0x12 | |
123 | #define LM90_REG_R_REMOTE_HIGHH 0x07 | |
124 | #define LM90_REG_W_REMOTE_HIGHH 0x0D | |
125 | #define LM90_REG_R_REMOTE_HIGHL 0x13 | |
126 | #define LM90_REG_W_REMOTE_HIGHL 0x13 | |
127 | #define LM90_REG_R_REMOTE_LOWH 0x08 | |
128 | #define LM90_REG_W_REMOTE_LOWH 0x0E | |
129 | #define LM90_REG_R_REMOTE_LOWL 0x14 | |
130 | #define LM90_REG_W_REMOTE_LOWL 0x14 | |
131 | #define LM90_REG_R_REMOTE_CRIT 0x19 | |
132 | #define LM90_REG_W_REMOTE_CRIT 0x19 | |
133 | #define LM90_REG_R_TCRIT_HYST 0x21 | |
134 | #define LM90_REG_W_TCRIT_HYST 0x21 | |
135 | ||
f65e1708 JD |
136 | /* MAX6657-specific registers */ |
137 | ||
138 | #define MAX6657_REG_R_LOCAL_TEMPL 0x11 | |
139 | ||
1da177e4 LT |
140 | /* |
141 | * Functions declaration | |
142 | */ | |
143 | ||
9b0e8526 JD |
144 | static int lm90_detect(struct i2c_client *client, int kind, |
145 | struct i2c_board_info *info); | |
146 | static int lm90_probe(struct i2c_client *client, | |
147 | const struct i2c_device_id *id); | |
1da177e4 | 148 | static void lm90_init_client(struct i2c_client *client); |
9b0e8526 | 149 | static int lm90_remove(struct i2c_client *client); |
1da177e4 LT |
150 | static struct lm90_data *lm90_update_device(struct device *dev); |
151 | ||
152 | /* | |
153 | * Driver data (common to all clients) | |
154 | */ | |
155 | ||
9b0e8526 JD |
156 | static const struct i2c_device_id lm90_id[] = { |
157 | { "adm1032", adm1032 }, | |
158 | { "adt7461", adt7461 }, | |
159 | { "lm90", lm90 }, | |
160 | { "lm86", lm86 }, | |
161 | { "lm89", lm99 }, | |
162 | { "lm99", lm99 }, /* Missing temperature offset */ | |
163 | { "max6657", max6657 }, | |
164 | { "max6658", max6657 }, | |
165 | { "max6659", max6657 }, | |
166 | { "max6680", max6680 }, | |
167 | { "max6681", max6680 }, | |
168 | { } | |
169 | }; | |
170 | MODULE_DEVICE_TABLE(i2c, lm90_id); | |
171 | ||
1da177e4 | 172 | static struct i2c_driver lm90_driver = { |
9b0e8526 | 173 | .class = I2C_CLASS_HWMON, |
cdaf7934 | 174 | .driver = { |
cdaf7934 LR |
175 | .name = "lm90", |
176 | }, | |
9b0e8526 JD |
177 | .probe = lm90_probe, |
178 | .remove = lm90_remove, | |
179 | .id_table = lm90_id, | |
180 | .detect = lm90_detect, | |
181 | .address_data = &addr_data, | |
1da177e4 LT |
182 | }; |
183 | ||
184 | /* | |
185 | * Client data (each client gets its own) | |
186 | */ | |
187 | ||
188 | struct lm90_data { | |
1beeffe4 | 189 | struct device *hwmon_dev; |
9a61bf63 | 190 | struct mutex update_lock; |
1da177e4 LT |
191 | char valid; /* zero until following fields are valid */ |
192 | unsigned long last_updated; /* in jiffies */ | |
193 | int kind; | |
194 | ||
195 | /* registers values */ | |
f65e1708 JD |
196 | s8 temp8[4]; /* 0: local low limit |
197 | 1: local high limit | |
198 | 2: local critical limit | |
199 | 3: remote critical limit */ | |
200 | s16 temp11[5]; /* 0: remote input | |
30d7394b | 201 | 1: remote low limit |
69f2f96d | 202 | 2: remote high limit |
f65e1708 JD |
203 | 3: remote offset (except max6657) |
204 | 4: local input */ | |
1da177e4 LT |
205 | u8 temp_hyst; |
206 | u8 alarms; /* bitvector */ | |
207 | }; | |
208 | ||
cea50fe2 NC |
209 | /* |
210 | * Conversions | |
211 | * For local temperatures and limits, critical limits and the hysteresis | |
212 | * value, the LM90 uses signed 8-bit values with LSB = 1 degree Celsius. | |
213 | * For remote temperatures and limits, it uses signed 11-bit values with | |
214 | * LSB = 0.125 degree Celsius, left-justified in 16-bit registers. | |
215 | */ | |
216 | ||
217 | static inline int temp1_from_reg(s8 val) | |
218 | { | |
219 | return val * 1000; | |
220 | } | |
221 | ||
222 | static inline int temp2_from_reg(s16 val) | |
223 | { | |
224 | return val / 32 * 125; | |
225 | } | |
226 | ||
227 | static s8 temp1_to_reg(long val) | |
228 | { | |
229 | if (val <= -128000) | |
230 | return -128; | |
231 | if (val >= 127000) | |
232 | return 127; | |
233 | if (val < 0) | |
234 | return (val - 500) / 1000; | |
235 | return (val + 500) / 1000; | |
236 | } | |
237 | ||
238 | static s16 temp2_to_reg(long val) | |
239 | { | |
240 | if (val <= -128000) | |
241 | return 0x8000; | |
242 | if (val >= 127875) | |
243 | return 0x7FE0; | |
244 | if (val < 0) | |
245 | return (val - 62) / 125 * 32; | |
246 | return (val + 62) / 125 * 32; | |
247 | } | |
248 | ||
249 | static u8 hyst_to_reg(long val) | |
250 | { | |
251 | if (val <= 0) | |
252 | return 0; | |
253 | if (val >= 30500) | |
254 | return 31; | |
255 | return (val + 500) / 1000; | |
256 | } | |
257 | ||
258 | /* | |
259 | * ADT7461 is almost identical to LM90 except that attempts to write | |
260 | * values that are outside the range 0 < temp < 127 are treated as | |
261 | * the boundary value. | |
262 | */ | |
263 | static u8 temp1_to_reg_adt7461(long val) | |
264 | { | |
265 | if (val <= 0) | |
266 | return 0; | |
267 | if (val >= 127000) | |
268 | return 127; | |
269 | return (val + 500) / 1000; | |
270 | } | |
271 | ||
272 | static u16 temp2_to_reg_adt7461(long val) | |
273 | { | |
274 | if (val <= 0) | |
275 | return 0; | |
276 | if (val >= 127750) | |
277 | return 0x7FC0; | |
278 | return (val + 125) / 250 * 64; | |
279 | } | |
280 | ||
1da177e4 LT |
281 | /* |
282 | * Sysfs stuff | |
283 | */ | |
284 | ||
30d7394b JD |
285 | static ssize_t show_temp8(struct device *dev, struct device_attribute *devattr, |
286 | char *buf) | |
287 | { | |
288 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
289 | struct lm90_data *data = lm90_update_device(dev); | |
cea50fe2 | 290 | return sprintf(buf, "%d\n", temp1_from_reg(data->temp8[attr->index])); |
30d7394b JD |
291 | } |
292 | ||
293 | static ssize_t set_temp8(struct device *dev, struct device_attribute *devattr, | |
294 | const char *buf, size_t count) | |
295 | { | |
296 | static const u8 reg[4] = { | |
297 | LM90_REG_W_LOCAL_LOW, | |
298 | LM90_REG_W_LOCAL_HIGH, | |
299 | LM90_REG_W_LOCAL_CRIT, | |
300 | LM90_REG_W_REMOTE_CRIT, | |
301 | }; | |
302 | ||
303 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
304 | struct i2c_client *client = to_i2c_client(dev); | |
305 | struct lm90_data *data = i2c_get_clientdata(client); | |
306 | long val = simple_strtol(buf, NULL, 10); | |
307 | int nr = attr->index; | |
308 | ||
9a61bf63 | 309 | mutex_lock(&data->update_lock); |
30d7394b | 310 | if (data->kind == adt7461) |
cea50fe2 | 311 | data->temp8[nr] = temp1_to_reg_adt7461(val); |
30d7394b | 312 | else |
cea50fe2 | 313 | data->temp8[nr] = temp1_to_reg(val); |
f65e1708 | 314 | i2c_smbus_write_byte_data(client, reg[nr], data->temp8[nr]); |
9a61bf63 | 315 | mutex_unlock(&data->update_lock); |
30d7394b | 316 | return count; |
1da177e4 | 317 | } |
30d7394b JD |
318 | |
319 | static ssize_t show_temp11(struct device *dev, struct device_attribute *devattr, | |
320 | char *buf) | |
321 | { | |
322 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
323 | struct lm90_data *data = lm90_update_device(dev); | |
cea50fe2 | 324 | return sprintf(buf, "%d\n", temp2_from_reg(data->temp11[attr->index])); |
1da177e4 | 325 | } |
30d7394b JD |
326 | |
327 | static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr, | |
328 | const char *buf, size_t count) | |
329 | { | |
69f2f96d | 330 | static const u8 reg[6] = { |
30d7394b JD |
331 | LM90_REG_W_REMOTE_LOWH, |
332 | LM90_REG_W_REMOTE_LOWL, | |
333 | LM90_REG_W_REMOTE_HIGHH, | |
334 | LM90_REG_W_REMOTE_HIGHL, | |
69f2f96d JD |
335 | LM90_REG_W_REMOTE_OFFSH, |
336 | LM90_REG_W_REMOTE_OFFSL, | |
30d7394b JD |
337 | }; |
338 | ||
339 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
340 | struct i2c_client *client = to_i2c_client(dev); | |
341 | struct lm90_data *data = i2c_get_clientdata(client); | |
342 | long val = simple_strtol(buf, NULL, 10); | |
343 | int nr = attr->index; | |
344 | ||
9a61bf63 | 345 | mutex_lock(&data->update_lock); |
30d7394b | 346 | if (data->kind == adt7461) |
cea50fe2 | 347 | data->temp11[nr] = temp2_to_reg_adt7461(val); |
5f502a83 | 348 | else if (data->kind == max6657 || data->kind == max6680) |
cea50fe2 | 349 | data->temp11[nr] = temp1_to_reg(val) << 8; |
30d7394b | 350 | else |
cea50fe2 | 351 | data->temp11[nr] = temp2_to_reg(val); |
5f502a83 | 352 | |
30d7394b JD |
353 | i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2], |
354 | data->temp11[nr] >> 8); | |
5f502a83 JD |
355 | if (data->kind != max6657 && data->kind != max6680) |
356 | i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2 + 1], | |
357 | data->temp11[nr] & 0xff); | |
9a61bf63 | 358 | mutex_unlock(&data->update_lock); |
30d7394b | 359 | return count; |
1da177e4 | 360 | } |
30d7394b JD |
361 | |
362 | static ssize_t show_temphyst(struct device *dev, struct device_attribute *devattr, | |
363 | char *buf) | |
364 | { | |
365 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
366 | struct lm90_data *data = lm90_update_device(dev); | |
cea50fe2 NC |
367 | return sprintf(buf, "%d\n", temp1_from_reg(data->temp8[attr->index]) |
368 | - temp1_from_reg(data->temp_hyst)); | |
1da177e4 | 369 | } |
1da177e4 | 370 | |
30d7394b JD |
371 | static ssize_t set_temphyst(struct device *dev, struct device_attribute *dummy, |
372 | const char *buf, size_t count) | |
1da177e4 LT |
373 | { |
374 | struct i2c_client *client = to_i2c_client(dev); | |
375 | struct lm90_data *data = i2c_get_clientdata(client); | |
376 | long val = simple_strtol(buf, NULL, 10); | |
377 | long hyst; | |
378 | ||
9a61bf63 | 379 | mutex_lock(&data->update_lock); |
cea50fe2 | 380 | hyst = temp1_from_reg(data->temp8[2]) - val; |
1da177e4 | 381 | i2c_smbus_write_byte_data(client, LM90_REG_W_TCRIT_HYST, |
cea50fe2 | 382 | hyst_to_reg(hyst)); |
9a61bf63 | 383 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
384 | return count; |
385 | } | |
386 | ||
30d7394b JD |
387 | static ssize_t show_alarms(struct device *dev, struct device_attribute *dummy, |
388 | char *buf) | |
1da177e4 LT |
389 | { |
390 | struct lm90_data *data = lm90_update_device(dev); | |
391 | return sprintf(buf, "%d\n", data->alarms); | |
392 | } | |
393 | ||
2d45771e JD |
394 | static ssize_t show_alarm(struct device *dev, struct device_attribute |
395 | *devattr, char *buf) | |
396 | { | |
397 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
398 | struct lm90_data *data = lm90_update_device(dev); | |
399 | int bitnr = attr->index; | |
400 | ||
401 | return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1); | |
402 | } | |
403 | ||
f65e1708 | 404 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp11, NULL, 4); |
30d7394b JD |
405 | static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp11, NULL, 0); |
406 | static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp8, | |
f65e1708 | 407 | set_temp8, 0); |
30d7394b JD |
408 | static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp11, |
409 | set_temp11, 1); | |
410 | static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp8, | |
f65e1708 | 411 | set_temp8, 1); |
30d7394b JD |
412 | static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp11, |
413 | set_temp11, 2); | |
414 | static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp8, | |
f65e1708 | 415 | set_temp8, 2); |
30d7394b | 416 | static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp8, |
f65e1708 | 417 | set_temp8, 3); |
30d7394b | 418 | static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temphyst, |
f65e1708 JD |
419 | set_temphyst, 2); |
420 | static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temphyst, NULL, 3); | |
69f2f96d JD |
421 | static SENSOR_DEVICE_ATTR(temp2_offset, S_IWUSR | S_IRUGO, show_temp11, |
422 | set_temp11, 3); | |
2d45771e JD |
423 | |
424 | /* Individual alarm files */ | |
425 | static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 0); | |
426 | static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1); | |
7817a39e | 427 | static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2); |
2d45771e JD |
428 | static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3); |
429 | static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4); | |
430 | static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 5); | |
431 | static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6); | |
432 | /* Raw alarm file for compatibility */ | |
1da177e4 LT |
433 | static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); |
434 | ||
0e39e01c JD |
435 | static struct attribute *lm90_attributes[] = { |
436 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
437 | &sensor_dev_attr_temp2_input.dev_attr.attr, | |
438 | &sensor_dev_attr_temp1_min.dev_attr.attr, | |
439 | &sensor_dev_attr_temp2_min.dev_attr.attr, | |
440 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
441 | &sensor_dev_attr_temp2_max.dev_attr.attr, | |
442 | &sensor_dev_attr_temp1_crit.dev_attr.attr, | |
443 | &sensor_dev_attr_temp2_crit.dev_attr.attr, | |
444 | &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr, | |
445 | &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr, | |
446 | ||
447 | &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, | |
448 | &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr, | |
7817a39e | 449 | &sensor_dev_attr_temp2_fault.dev_attr.attr, |
0e39e01c JD |
450 | &sensor_dev_attr_temp2_min_alarm.dev_attr.attr, |
451 | &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, | |
452 | &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, | |
453 | &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, | |
454 | &dev_attr_alarms.attr, | |
455 | NULL | |
456 | }; | |
457 | ||
458 | static const struct attribute_group lm90_group = { | |
459 | .attrs = lm90_attributes, | |
460 | }; | |
461 | ||
c3df5806 JD |
462 | /* pec used for ADM1032 only */ |
463 | static ssize_t show_pec(struct device *dev, struct device_attribute *dummy, | |
464 | char *buf) | |
465 | { | |
466 | struct i2c_client *client = to_i2c_client(dev); | |
467 | return sprintf(buf, "%d\n", !!(client->flags & I2C_CLIENT_PEC)); | |
468 | } | |
469 | ||
470 | static ssize_t set_pec(struct device *dev, struct device_attribute *dummy, | |
471 | const char *buf, size_t count) | |
472 | { | |
473 | struct i2c_client *client = to_i2c_client(dev); | |
474 | long val = simple_strtol(buf, NULL, 10); | |
475 | ||
476 | switch (val) { | |
477 | case 0: | |
478 | client->flags &= ~I2C_CLIENT_PEC; | |
479 | break; | |
480 | case 1: | |
481 | client->flags |= I2C_CLIENT_PEC; | |
482 | break; | |
483 | default: | |
484 | return -EINVAL; | |
485 | } | |
486 | ||
487 | return count; | |
488 | } | |
489 | ||
490 | static DEVICE_ATTR(pec, S_IWUSR | S_IRUGO, show_pec, set_pec); | |
491 | ||
1da177e4 LT |
492 | /* |
493 | * Real code | |
494 | */ | |
495 | ||
c3df5806 | 496 | /* The ADM1032 supports PEC but not on write byte transactions, so we need |
0966415d | 497 | to explicitly ask for a transaction without PEC. */ |
c3df5806 JD |
498 | static inline s32 adm1032_write_byte(struct i2c_client *client, u8 value) |
499 | { | |
500 | return i2c_smbus_xfer(client->adapter, client->addr, | |
501 | client->flags & ~I2C_CLIENT_PEC, | |
502 | I2C_SMBUS_WRITE, value, I2C_SMBUS_BYTE, NULL); | |
503 | } | |
504 | ||
505 | /* It is assumed that client->update_lock is held (unless we are in | |
506 | detection or initialization steps). This matters when PEC is enabled, | |
507 | because we don't want the address pointer to change between the write | |
508 | byte and the read byte transactions. */ | |
8256fe0f JD |
509 | static int lm90_read_reg(struct i2c_client* client, u8 reg, u8 *value) |
510 | { | |
511 | int err; | |
512 | ||
c3df5806 JD |
513 | if (client->flags & I2C_CLIENT_PEC) { |
514 | err = adm1032_write_byte(client, reg); | |
515 | if (err >= 0) | |
516 | err = i2c_smbus_read_byte(client); | |
517 | } else | |
518 | err = i2c_smbus_read_byte_data(client, reg); | |
8256fe0f JD |
519 | |
520 | if (err < 0) { | |
521 | dev_warn(&client->dev, "Register %#02x read failed (%d)\n", | |
522 | reg, err); | |
523 | return err; | |
524 | } | |
525 | *value = err; | |
526 | ||
527 | return 0; | |
528 | } | |
529 | ||
9b0e8526 JD |
530 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
531 | static int lm90_detect(struct i2c_client *new_client, int kind, | |
532 | struct i2c_board_info *info) | |
1da177e4 | 533 | { |
9b0e8526 JD |
534 | struct i2c_adapter *adapter = new_client->adapter; |
535 | int address = new_client->addr; | |
1da177e4 LT |
536 | const char *name = ""; |
537 | ||
538 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
9b0e8526 | 539 | return -ENODEV; |
1da177e4 LT |
540 | |
541 | /* | |
542 | * Now we do the remaining detection. A negative kind means that | |
543 | * the driver was loaded with no force parameter (default), so we | |
544 | * must both detect and identify the chip. A zero kind means that | |
545 | * the driver was loaded with the force parameter, the detection | |
546 | * step shall be skipped. A positive kind means that the driver | |
547 | * was loaded with the force parameter and a given kind of chip is | |
548 | * requested, so both the detection and the identification steps | |
549 | * are skipped. | |
550 | */ | |
551 | ||
552 | /* Default to an LM90 if forced */ | |
553 | if (kind == 0) | |
554 | kind = lm90; | |
555 | ||
556 | if (kind < 0) { /* detection and identification */ | |
e0ae87a4 JD |
557 | int man_id, chip_id, reg_config1, reg_convrate; |
558 | ||
559 | if ((man_id = i2c_smbus_read_byte_data(new_client, | |
560 | LM90_REG_R_MAN_ID)) < 0 | |
561 | || (chip_id = i2c_smbus_read_byte_data(new_client, | |
562 | LM90_REG_R_CHIP_ID)) < 0 | |
563 | || (reg_config1 = i2c_smbus_read_byte_data(new_client, | |
564 | LM90_REG_R_CONFIG1)) < 0 | |
565 | || (reg_convrate = i2c_smbus_read_byte_data(new_client, | |
566 | LM90_REG_R_CONVRATE)) < 0) | |
9b0e8526 | 567 | return -ENODEV; |
1da177e4 | 568 | |
32c82a93 RB |
569 | if ((address == 0x4C || address == 0x4D) |
570 | && man_id == 0x01) { /* National Semiconductor */ | |
e0ae87a4 | 571 | int reg_config2; |
1da177e4 | 572 | |
e0ae87a4 JD |
573 | if ((reg_config2 = i2c_smbus_read_byte_data(new_client, |
574 | LM90_REG_R_CONFIG2)) < 0) | |
9b0e8526 | 575 | return -ENODEV; |
1da177e4 LT |
576 | |
577 | if ((reg_config1 & 0x2A) == 0x00 | |
578 | && (reg_config2 & 0xF8) == 0x00 | |
579 | && reg_convrate <= 0x09) { | |
580 | if (address == 0x4C | |
581 | && (chip_id & 0xF0) == 0x20) { /* LM90 */ | |
582 | kind = lm90; | |
583 | } else | |
584 | if ((chip_id & 0xF0) == 0x30) { /* LM89/LM99 */ | |
585 | kind = lm99; | |
586 | } else | |
587 | if (address == 0x4C | |
588 | && (chip_id & 0xF0) == 0x10) { /* LM86 */ | |
589 | kind = lm86; | |
590 | } | |
591 | } | |
592 | } else | |
32c82a93 RB |
593 | if ((address == 0x4C || address == 0x4D) |
594 | && man_id == 0x41) { /* Analog Devices */ | |
90209b42 | 595 | if ((chip_id & 0xF0) == 0x40 /* ADM1032 */ |
1da177e4 LT |
596 | && (reg_config1 & 0x3F) == 0x00 |
597 | && reg_convrate <= 0x0A) { | |
598 | kind = adm1032; | |
599 | } else | |
90209b42 | 600 | if (chip_id == 0x51 /* ADT7461 */ |
1da177e4 LT |
601 | && (reg_config1 & 0x1F) == 0x00 /* check compat mode */ |
602 | && reg_convrate <= 0x0A) { | |
603 | kind = adt7461; | |
604 | } | |
605 | } else | |
606 | if (man_id == 0x4D) { /* Maxim */ | |
607 | /* | |
32c82a93 RB |
608 | * The MAX6657, MAX6658 and MAX6659 do NOT have a |
609 | * chip_id register. Reading from that address will | |
610 | * return the last read value, which in our case is | |
611 | * those of the man_id register. Likewise, the config1 | |
612 | * register seems to lack a low nibble, so the value | |
613 | * will be those of the previous read, so in our case | |
614 | * those of the man_id register. | |
1da177e4 LT |
615 | */ |
616 | if (chip_id == man_id | |
f5744e37 | 617 | && (address == 0x4C || address == 0x4D) |
1da177e4 LT |
618 | && (reg_config1 & 0x1F) == (man_id & 0x0F) |
619 | && reg_convrate <= 0x09) { | |
620 | kind = max6657; | |
32c82a93 RB |
621 | } else |
622 | /* The chip_id register of the MAX6680 and MAX6681 | |
623 | * holds the revision of the chip. | |
624 | * the lowest bit of the config1 register is unused | |
625 | * and should return zero when read, so should the | |
626 | * second to last bit of config1 (software reset) | |
627 | */ | |
628 | if (chip_id == 0x01 | |
629 | && (reg_config1 & 0x03) == 0x00 | |
630 | && reg_convrate <= 0x07) { | |
631 | kind = max6680; | |
1da177e4 LT |
632 | } |
633 | } | |
634 | ||
635 | if (kind <= 0) { /* identification failed */ | |
636 | dev_info(&adapter->dev, | |
637 | "Unsupported chip (man_id=0x%02X, " | |
638 | "chip_id=0x%02X).\n", man_id, chip_id); | |
9b0e8526 | 639 | return -ENODEV; |
1da177e4 LT |
640 | } |
641 | } | |
642 | ||
9b0e8526 | 643 | /* Fill the i2c board info */ |
1da177e4 LT |
644 | if (kind == lm90) { |
645 | name = "lm90"; | |
646 | } else if (kind == adm1032) { | |
647 | name = "adm1032"; | |
c3df5806 JD |
648 | /* The ADM1032 supports PEC, but only if combined |
649 | transactions are not used. */ | |
650 | if (i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE)) | |
9b0e8526 | 651 | info->flags |= I2C_CLIENT_PEC; |
1da177e4 LT |
652 | } else if (kind == lm99) { |
653 | name = "lm99"; | |
654 | } else if (kind == lm86) { | |
655 | name = "lm86"; | |
656 | } else if (kind == max6657) { | |
657 | name = "max6657"; | |
32c82a93 RB |
658 | } else if (kind == max6680) { |
659 | name = "max6680"; | |
1da177e4 LT |
660 | } else if (kind == adt7461) { |
661 | name = "adt7461"; | |
662 | } | |
9b0e8526 JD |
663 | strlcpy(info->type, name, I2C_NAME_SIZE); |
664 | ||
665 | return 0; | |
666 | } | |
667 | ||
668 | static int lm90_probe(struct i2c_client *new_client, | |
669 | const struct i2c_device_id *id) | |
670 | { | |
671 | struct i2c_adapter *adapter = to_i2c_adapter(new_client->dev.parent); | |
672 | struct lm90_data *data; | |
673 | int err; | |
1da177e4 | 674 | |
9b0e8526 JD |
675 | data = kzalloc(sizeof(struct lm90_data), GFP_KERNEL); |
676 | if (!data) { | |
677 | err = -ENOMEM; | |
678 | goto exit; | |
679 | } | |
680 | i2c_set_clientdata(new_client, data); | |
9a61bf63 | 681 | mutex_init(&data->update_lock); |
1da177e4 | 682 | |
9b0e8526 JD |
683 | /* Set the device type */ |
684 | data->kind = id->driver_data; | |
685 | if (data->kind == adm1032) { | |
686 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE)) | |
687 | new_client->flags &= ~I2C_CLIENT_PEC; | |
688 | } | |
1da177e4 LT |
689 | |
690 | /* Initialize the LM90 chip */ | |
691 | lm90_init_client(new_client); | |
692 | ||
693 | /* Register sysfs hooks */ | |
0e39e01c | 694 | if ((err = sysfs_create_group(&new_client->dev.kobj, &lm90_group))) |
9b0e8526 | 695 | goto exit_free; |
0e39e01c JD |
696 | if (new_client->flags & I2C_CLIENT_PEC) { |
697 | if ((err = device_create_file(&new_client->dev, | |
698 | &dev_attr_pec))) | |
699 | goto exit_remove_files; | |
700 | } | |
69f2f96d JD |
701 | if (data->kind != max6657) { |
702 | if ((err = device_create_file(&new_client->dev, | |
703 | &sensor_dev_attr_temp2_offset.dev_attr))) | |
704 | goto exit_remove_files; | |
705 | } | |
0e39e01c | 706 | |
1beeffe4 TJ |
707 | data->hwmon_dev = hwmon_device_register(&new_client->dev); |
708 | if (IS_ERR(data->hwmon_dev)) { | |
709 | err = PTR_ERR(data->hwmon_dev); | |
0e39e01c | 710 | goto exit_remove_files; |
943b0830 MH |
711 | } |
712 | ||
1da177e4 LT |
713 | return 0; |
714 | ||
0e39e01c JD |
715 | exit_remove_files: |
716 | sysfs_remove_group(&new_client->dev.kobj, &lm90_group); | |
717 | device_remove_file(&new_client->dev, &dev_attr_pec); | |
1da177e4 LT |
718 | exit_free: |
719 | kfree(data); | |
720 | exit: | |
721 | return err; | |
722 | } | |
723 | ||
724 | static void lm90_init_client(struct i2c_client *client) | |
725 | { | |
32c82a93 RB |
726 | u8 config, config_orig; |
727 | struct lm90_data *data = i2c_get_clientdata(client); | |
1da177e4 LT |
728 | |
729 | /* | |
730 | * Start the conversions. | |
731 | */ | |
732 | i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE, | |
733 | 5); /* 2 Hz */ | |
8256fe0f JD |
734 | if (lm90_read_reg(client, LM90_REG_R_CONFIG1, &config) < 0) { |
735 | dev_warn(&client->dev, "Initialization failed!\n"); | |
736 | return; | |
737 | } | |
32c82a93 RB |
738 | config_orig = config; |
739 | ||
740 | /* | |
741 | * Put MAX6680/MAX8881 into extended resolution (bit 0x10, | |
742 | * 0.125 degree resolution) and range (0x08, extend range | |
743 | * to -64 degree) mode for the remote temperature sensor. | |
744 | */ | |
745 | if (data->kind == max6680) { | |
746 | config |= 0x18; | |
747 | } | |
748 | ||
749 | config &= 0xBF; /* run */ | |
750 | if (config != config_orig) /* Only write if changed */ | |
751 | i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, config); | |
1da177e4 LT |
752 | } |
753 | ||
9b0e8526 | 754 | static int lm90_remove(struct i2c_client *client) |
1da177e4 | 755 | { |
943b0830 | 756 | struct lm90_data *data = i2c_get_clientdata(client); |
1da177e4 | 757 | |
1beeffe4 | 758 | hwmon_device_unregister(data->hwmon_dev); |
0e39e01c JD |
759 | sysfs_remove_group(&client->dev.kobj, &lm90_group); |
760 | device_remove_file(&client->dev, &dev_attr_pec); | |
69f2f96d JD |
761 | if (data->kind != max6657) |
762 | device_remove_file(&client->dev, | |
763 | &sensor_dev_attr_temp2_offset.dev_attr); | |
943b0830 | 764 | |
943b0830 | 765 | kfree(data); |
1da177e4 LT |
766 | return 0; |
767 | } | |
768 | ||
6388a388 JD |
769 | static int lm90_read16(struct i2c_client *client, u8 regh, u8 regl, u16 *value) |
770 | { | |
771 | int err; | |
772 | u8 oldh, newh, l; | |
773 | ||
774 | /* | |
775 | * There is a trick here. We have to read two registers to have the | |
776 | * sensor temperature, but we have to beware a conversion could occur | |
777 | * inbetween the readings. The datasheet says we should either use | |
778 | * the one-shot conversion register, which we don't want to do | |
779 | * (disables hardware monitoring) or monitor the busy bit, which is | |
780 | * impossible (we can't read the values and monitor that bit at the | |
781 | * exact same time). So the solution used here is to read the high | |
782 | * byte once, then the low byte, then the high byte again. If the new | |
783 | * high byte matches the old one, then we have a valid reading. Else | |
784 | * we have to read the low byte again, and now we believe we have a | |
785 | * correct reading. | |
786 | */ | |
787 | if ((err = lm90_read_reg(client, regh, &oldh)) | |
788 | || (err = lm90_read_reg(client, regl, &l)) | |
789 | || (err = lm90_read_reg(client, regh, &newh))) | |
790 | return err; | |
791 | if (oldh != newh) { | |
792 | err = lm90_read_reg(client, regl, &l); | |
793 | if (err) | |
794 | return err; | |
795 | } | |
796 | *value = (newh << 8) | l; | |
797 | ||
798 | return 0; | |
799 | } | |
800 | ||
1da177e4 LT |
801 | static struct lm90_data *lm90_update_device(struct device *dev) |
802 | { | |
803 | struct i2c_client *client = to_i2c_client(dev); | |
804 | struct lm90_data *data = i2c_get_clientdata(client); | |
805 | ||
9a61bf63 | 806 | mutex_lock(&data->update_lock); |
1da177e4 LT |
807 | |
808 | if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) { | |
6388a388 | 809 | u8 h, l; |
1da177e4 LT |
810 | |
811 | dev_dbg(&client->dev, "Updating lm90 data.\n"); | |
f65e1708 JD |
812 | lm90_read_reg(client, LM90_REG_R_LOCAL_LOW, &data->temp8[0]); |
813 | lm90_read_reg(client, LM90_REG_R_LOCAL_HIGH, &data->temp8[1]); | |
814 | lm90_read_reg(client, LM90_REG_R_LOCAL_CRIT, &data->temp8[2]); | |
815 | lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT, &data->temp8[3]); | |
8256fe0f | 816 | lm90_read_reg(client, LM90_REG_R_TCRIT_HYST, &data->temp_hyst); |
1da177e4 | 817 | |
f65e1708 JD |
818 | if (data->kind == max6657) { |
819 | lm90_read16(client, LM90_REG_R_LOCAL_TEMP, | |
820 | MAX6657_REG_R_LOCAL_TEMPL, | |
821 | &data->temp11[4]); | |
822 | } else { | |
823 | if (lm90_read_reg(client, LM90_REG_R_LOCAL_TEMP, | |
824 | &h) == 0) | |
825 | data->temp11[4] = h << 8; | |
826 | } | |
6388a388 JD |
827 | lm90_read16(client, LM90_REG_R_REMOTE_TEMPH, |
828 | LM90_REG_R_REMOTE_TEMPL, &data->temp11[0]); | |
829 | ||
5f502a83 JD |
830 | if (lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &h) == 0) { |
831 | data->temp11[1] = h << 8; | |
832 | if (data->kind != max6657 && data->kind != max6680 | |
833 | && lm90_read_reg(client, LM90_REG_R_REMOTE_LOWL, | |
834 | &l) == 0) | |
835 | data->temp11[1] |= l; | |
836 | } | |
837 | if (lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &h) == 0) { | |
838 | data->temp11[2] = h << 8; | |
839 | if (data->kind != max6657 && data->kind != max6680 | |
840 | && lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHL, | |
841 | &l) == 0) | |
842 | data->temp11[2] |= l; | |
843 | } | |
844 | ||
69f2f96d JD |
845 | if (data->kind != max6657) { |
846 | if (lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSH, | |
6388a388 | 847 | &h) == 0 |
69f2f96d JD |
848 | && lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSL, |
849 | &l) == 0) | |
6388a388 | 850 | data->temp11[3] = (h << 8) | l; |
69f2f96d | 851 | } |
8256fe0f | 852 | lm90_read_reg(client, LM90_REG_R_STATUS, &data->alarms); |
1da177e4 LT |
853 | |
854 | data->last_updated = jiffies; | |
855 | data->valid = 1; | |
856 | } | |
857 | ||
9a61bf63 | 858 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
859 | |
860 | return data; | |
861 | } | |
862 | ||
863 | static int __init sensors_lm90_init(void) | |
864 | { | |
865 | return i2c_add_driver(&lm90_driver); | |
866 | } | |
867 | ||
868 | static void __exit sensors_lm90_exit(void) | |
869 | { | |
870 | i2c_del_driver(&lm90_driver); | |
871 | } | |
872 | ||
873 | MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>"); | |
874 | MODULE_DESCRIPTION("LM90/ADM1032 driver"); | |
875 | MODULE_LICENSE("GPL"); | |
876 | ||
877 | module_init(sensors_lm90_init); | |
878 | module_exit(sensors_lm90_exit); |