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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 | ||
f65e1708 JD |
152 | /* MAX6657-specific registers */ |
153 | ||
154 | #define MAX6657_REG_R_LOCAL_TEMPL 0x11 | |
155 | ||
1da177e4 LT |
156 | /* |
157 | * Conversions and various macros | |
158 | * For local temperatures and limits, critical limits and the hysteresis | |
44bbe87e | 159 | * value, the LM90 uses signed 8-bit values with LSB = 1 degree Celsius. |
1da177e4 | 160 | * For remote temperatures and limits, it uses signed 11-bit values with |
44bbe87e | 161 | * LSB = 0.125 degree Celsius, left-justified in 16-bit registers. |
1da177e4 LT |
162 | */ |
163 | ||
164 | #define TEMP1_FROM_REG(val) ((val) * 1000) | |
165 | #define TEMP1_TO_REG(val) ((val) <= -128000 ? -128 : \ | |
166 | (val) >= 127000 ? 127 : \ | |
167 | (val) < 0 ? ((val) - 500) / 1000 : \ | |
168 | ((val) + 500) / 1000) | |
169 | #define TEMP2_FROM_REG(val) ((val) / 32 * 125) | |
170 | #define TEMP2_TO_REG(val) ((val) <= -128000 ? 0x8000 : \ | |
171 | (val) >= 127875 ? 0x7FE0 : \ | |
172 | (val) < 0 ? ((val) - 62) / 125 * 32 : \ | |
173 | ((val) + 62) / 125 * 32) | |
174 | #define HYST_TO_REG(val) ((val) <= 0 ? 0 : (val) >= 30500 ? 31 : \ | |
175 | ((val) + 500) / 1000) | |
176 | ||
177 | /* | |
178 | * ADT7461 is almost identical to LM90 except that attempts to write | |
179 | * values that are outside the range 0 < temp < 127 are treated as | |
180 | * the boundary value. | |
181 | */ | |
182 | ||
183 | #define TEMP1_TO_REG_ADT7461(val) ((val) <= 0 ? 0 : \ | |
184 | (val) >= 127000 ? 127 : \ | |
185 | ((val) + 500) / 1000) | |
186 | #define TEMP2_TO_REG_ADT7461(val) ((val) <= 0 ? 0 : \ | |
187 | (val) >= 127750 ? 0x7FC0 : \ | |
188 | ((val) + 125) / 250 * 64) | |
189 | ||
190 | /* | |
191 | * Functions declaration | |
192 | */ | |
193 | ||
9b0e8526 JD |
194 | static int lm90_detect(struct i2c_client *client, int kind, |
195 | struct i2c_board_info *info); | |
196 | static int lm90_probe(struct i2c_client *client, | |
197 | const struct i2c_device_id *id); | |
1da177e4 | 198 | static void lm90_init_client(struct i2c_client *client); |
9b0e8526 | 199 | static int lm90_remove(struct i2c_client *client); |
1da177e4 LT |
200 | static struct lm90_data *lm90_update_device(struct device *dev); |
201 | ||
202 | /* | |
203 | * Driver data (common to all clients) | |
204 | */ | |
205 | ||
9b0e8526 JD |
206 | static const struct i2c_device_id lm90_id[] = { |
207 | { "adm1032", adm1032 }, | |
208 | { "adt7461", adt7461 }, | |
209 | { "lm90", lm90 }, | |
210 | { "lm86", lm86 }, | |
211 | { "lm89", lm99 }, | |
212 | { "lm99", lm99 }, /* Missing temperature offset */ | |
213 | { "max6657", max6657 }, | |
214 | { "max6658", max6657 }, | |
215 | { "max6659", max6657 }, | |
216 | { "max6680", max6680 }, | |
217 | { "max6681", max6680 }, | |
218 | { } | |
219 | }; | |
220 | MODULE_DEVICE_TABLE(i2c, lm90_id); | |
221 | ||
1da177e4 | 222 | static struct i2c_driver lm90_driver = { |
9b0e8526 | 223 | .class = I2C_CLASS_HWMON, |
cdaf7934 | 224 | .driver = { |
cdaf7934 LR |
225 | .name = "lm90", |
226 | }, | |
9b0e8526 JD |
227 | .probe = lm90_probe, |
228 | .remove = lm90_remove, | |
229 | .id_table = lm90_id, | |
230 | .detect = lm90_detect, | |
231 | .address_data = &addr_data, | |
1da177e4 LT |
232 | }; |
233 | ||
234 | /* | |
235 | * Client data (each client gets its own) | |
236 | */ | |
237 | ||
238 | struct lm90_data { | |
1beeffe4 | 239 | struct device *hwmon_dev; |
9a61bf63 | 240 | struct mutex update_lock; |
1da177e4 LT |
241 | char valid; /* zero until following fields are valid */ |
242 | unsigned long last_updated; /* in jiffies */ | |
243 | int kind; | |
244 | ||
245 | /* registers values */ | |
f65e1708 JD |
246 | s8 temp8[4]; /* 0: local low limit |
247 | 1: local high limit | |
248 | 2: local critical limit | |
249 | 3: remote critical limit */ | |
250 | s16 temp11[5]; /* 0: remote input | |
30d7394b | 251 | 1: remote low limit |
69f2f96d | 252 | 2: remote high limit |
f65e1708 JD |
253 | 3: remote offset (except max6657) |
254 | 4: local input */ | |
1da177e4 LT |
255 | u8 temp_hyst; |
256 | u8 alarms; /* bitvector */ | |
257 | }; | |
258 | ||
259 | /* | |
260 | * Sysfs stuff | |
261 | */ | |
262 | ||
30d7394b JD |
263 | static ssize_t show_temp8(struct device *dev, struct device_attribute *devattr, |
264 | char *buf) | |
265 | { | |
266 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
267 | struct lm90_data *data = lm90_update_device(dev); | |
268 | return sprintf(buf, "%d\n", TEMP1_FROM_REG(data->temp8[attr->index])); | |
269 | } | |
270 | ||
271 | static ssize_t set_temp8(struct device *dev, struct device_attribute *devattr, | |
272 | const char *buf, size_t count) | |
273 | { | |
274 | static const u8 reg[4] = { | |
275 | LM90_REG_W_LOCAL_LOW, | |
276 | LM90_REG_W_LOCAL_HIGH, | |
277 | LM90_REG_W_LOCAL_CRIT, | |
278 | LM90_REG_W_REMOTE_CRIT, | |
279 | }; | |
280 | ||
281 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
282 | struct i2c_client *client = to_i2c_client(dev); | |
283 | struct lm90_data *data = i2c_get_clientdata(client); | |
284 | long val = simple_strtol(buf, NULL, 10); | |
285 | int nr = attr->index; | |
286 | ||
9a61bf63 | 287 | mutex_lock(&data->update_lock); |
30d7394b JD |
288 | if (data->kind == adt7461) |
289 | data->temp8[nr] = TEMP1_TO_REG_ADT7461(val); | |
290 | else | |
291 | data->temp8[nr] = TEMP1_TO_REG(val); | |
f65e1708 | 292 | i2c_smbus_write_byte_data(client, reg[nr], data->temp8[nr]); |
9a61bf63 | 293 | mutex_unlock(&data->update_lock); |
30d7394b | 294 | return count; |
1da177e4 | 295 | } |
30d7394b JD |
296 | |
297 | static ssize_t show_temp11(struct device *dev, struct device_attribute *devattr, | |
298 | char *buf) | |
299 | { | |
300 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
301 | struct lm90_data *data = lm90_update_device(dev); | |
302 | return sprintf(buf, "%d\n", TEMP2_FROM_REG(data->temp11[attr->index])); | |
1da177e4 | 303 | } |
30d7394b JD |
304 | |
305 | static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr, | |
306 | const char *buf, size_t count) | |
307 | { | |
69f2f96d | 308 | static const u8 reg[6] = { |
30d7394b JD |
309 | LM90_REG_W_REMOTE_LOWH, |
310 | LM90_REG_W_REMOTE_LOWL, | |
311 | LM90_REG_W_REMOTE_HIGHH, | |
312 | LM90_REG_W_REMOTE_HIGHL, | |
69f2f96d JD |
313 | LM90_REG_W_REMOTE_OFFSH, |
314 | LM90_REG_W_REMOTE_OFFSL, | |
30d7394b JD |
315 | }; |
316 | ||
317 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
318 | struct i2c_client *client = to_i2c_client(dev); | |
319 | struct lm90_data *data = i2c_get_clientdata(client); | |
320 | long val = simple_strtol(buf, NULL, 10); | |
321 | int nr = attr->index; | |
322 | ||
9a61bf63 | 323 | mutex_lock(&data->update_lock); |
30d7394b JD |
324 | if (data->kind == adt7461) |
325 | data->temp11[nr] = TEMP2_TO_REG_ADT7461(val); | |
5f502a83 JD |
326 | else if (data->kind == max6657 || data->kind == max6680) |
327 | data->temp11[nr] = TEMP1_TO_REG(val) << 8; | |
30d7394b JD |
328 | else |
329 | data->temp11[nr] = TEMP2_TO_REG(val); | |
5f502a83 | 330 | |
30d7394b JD |
331 | i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2], |
332 | data->temp11[nr] >> 8); | |
5f502a83 JD |
333 | if (data->kind != max6657 && data->kind != max6680) |
334 | i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2 + 1], | |
335 | data->temp11[nr] & 0xff); | |
9a61bf63 | 336 | mutex_unlock(&data->update_lock); |
30d7394b | 337 | return count; |
1da177e4 | 338 | } |
30d7394b JD |
339 | |
340 | static ssize_t show_temphyst(struct device *dev, struct device_attribute *devattr, | |
341 | char *buf) | |
342 | { | |
343 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
344 | struct lm90_data *data = lm90_update_device(dev); | |
345 | return sprintf(buf, "%d\n", TEMP1_FROM_REG(data->temp8[attr->index]) | |
346 | - TEMP1_FROM_REG(data->temp_hyst)); | |
1da177e4 | 347 | } |
1da177e4 | 348 | |
30d7394b JD |
349 | static ssize_t set_temphyst(struct device *dev, struct device_attribute *dummy, |
350 | const char *buf, size_t count) | |
1da177e4 LT |
351 | { |
352 | struct i2c_client *client = to_i2c_client(dev); | |
353 | struct lm90_data *data = i2c_get_clientdata(client); | |
354 | long val = simple_strtol(buf, NULL, 10); | |
355 | long hyst; | |
356 | ||
9a61bf63 | 357 | mutex_lock(&data->update_lock); |
f65e1708 | 358 | hyst = TEMP1_FROM_REG(data->temp8[2]) - val; |
1da177e4 LT |
359 | i2c_smbus_write_byte_data(client, LM90_REG_W_TCRIT_HYST, |
360 | HYST_TO_REG(hyst)); | |
9a61bf63 | 361 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
362 | return count; |
363 | } | |
364 | ||
30d7394b JD |
365 | static ssize_t show_alarms(struct device *dev, struct device_attribute *dummy, |
366 | char *buf) | |
1da177e4 LT |
367 | { |
368 | struct lm90_data *data = lm90_update_device(dev); | |
369 | return sprintf(buf, "%d\n", data->alarms); | |
370 | } | |
371 | ||
2d45771e JD |
372 | static ssize_t show_alarm(struct device *dev, struct device_attribute |
373 | *devattr, char *buf) | |
374 | { | |
375 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
376 | struct lm90_data *data = lm90_update_device(dev); | |
377 | int bitnr = attr->index; | |
378 | ||
379 | return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1); | |
380 | } | |
381 | ||
f65e1708 | 382 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp11, NULL, 4); |
30d7394b JD |
383 | static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp11, NULL, 0); |
384 | static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp8, | |
f65e1708 | 385 | set_temp8, 0); |
30d7394b JD |
386 | static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp11, |
387 | set_temp11, 1); | |
388 | static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp8, | |
f65e1708 | 389 | set_temp8, 1); |
30d7394b JD |
390 | static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp11, |
391 | set_temp11, 2); | |
392 | static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp8, | |
f65e1708 | 393 | set_temp8, 2); |
30d7394b | 394 | static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp8, |
f65e1708 | 395 | set_temp8, 3); |
30d7394b | 396 | static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temphyst, |
f65e1708 JD |
397 | set_temphyst, 2); |
398 | static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temphyst, NULL, 3); | |
69f2f96d JD |
399 | static SENSOR_DEVICE_ATTR(temp2_offset, S_IWUSR | S_IRUGO, show_temp11, |
400 | set_temp11, 3); | |
2d45771e JD |
401 | |
402 | /* Individual alarm files */ | |
403 | static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 0); | |
404 | static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1); | |
7817a39e | 405 | static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2); |
2d45771e JD |
406 | static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3); |
407 | static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4); | |
408 | static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 5); | |
409 | static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6); | |
410 | /* Raw alarm file for compatibility */ | |
1da177e4 LT |
411 | static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); |
412 | ||
0e39e01c JD |
413 | static struct attribute *lm90_attributes[] = { |
414 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
415 | &sensor_dev_attr_temp2_input.dev_attr.attr, | |
416 | &sensor_dev_attr_temp1_min.dev_attr.attr, | |
417 | &sensor_dev_attr_temp2_min.dev_attr.attr, | |
418 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
419 | &sensor_dev_attr_temp2_max.dev_attr.attr, | |
420 | &sensor_dev_attr_temp1_crit.dev_attr.attr, | |
421 | &sensor_dev_attr_temp2_crit.dev_attr.attr, | |
422 | &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr, | |
423 | &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr, | |
424 | ||
425 | &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, | |
426 | &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr, | |
7817a39e | 427 | &sensor_dev_attr_temp2_fault.dev_attr.attr, |
0e39e01c JD |
428 | &sensor_dev_attr_temp2_min_alarm.dev_attr.attr, |
429 | &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, | |
430 | &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, | |
431 | &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, | |
432 | &dev_attr_alarms.attr, | |
433 | NULL | |
434 | }; | |
435 | ||
436 | static const struct attribute_group lm90_group = { | |
437 | .attrs = lm90_attributes, | |
438 | }; | |
439 | ||
c3df5806 JD |
440 | /* pec used for ADM1032 only */ |
441 | static ssize_t show_pec(struct device *dev, struct device_attribute *dummy, | |
442 | char *buf) | |
443 | { | |
444 | struct i2c_client *client = to_i2c_client(dev); | |
445 | return sprintf(buf, "%d\n", !!(client->flags & I2C_CLIENT_PEC)); | |
446 | } | |
447 | ||
448 | static ssize_t set_pec(struct device *dev, struct device_attribute *dummy, | |
449 | const char *buf, size_t count) | |
450 | { | |
451 | struct i2c_client *client = to_i2c_client(dev); | |
452 | long val = simple_strtol(buf, NULL, 10); | |
453 | ||
454 | switch (val) { | |
455 | case 0: | |
456 | client->flags &= ~I2C_CLIENT_PEC; | |
457 | break; | |
458 | case 1: | |
459 | client->flags |= I2C_CLIENT_PEC; | |
460 | break; | |
461 | default: | |
462 | return -EINVAL; | |
463 | } | |
464 | ||
465 | return count; | |
466 | } | |
467 | ||
468 | static DEVICE_ATTR(pec, S_IWUSR | S_IRUGO, show_pec, set_pec); | |
469 | ||
1da177e4 LT |
470 | /* |
471 | * Real code | |
472 | */ | |
473 | ||
c3df5806 | 474 | /* The ADM1032 supports PEC but not on write byte transactions, so we need |
0966415d | 475 | to explicitly ask for a transaction without PEC. */ |
c3df5806 JD |
476 | static inline s32 adm1032_write_byte(struct i2c_client *client, u8 value) |
477 | { | |
478 | return i2c_smbus_xfer(client->adapter, client->addr, | |
479 | client->flags & ~I2C_CLIENT_PEC, | |
480 | I2C_SMBUS_WRITE, value, I2C_SMBUS_BYTE, NULL); | |
481 | } | |
482 | ||
483 | /* It is assumed that client->update_lock is held (unless we are in | |
484 | detection or initialization steps). This matters when PEC is enabled, | |
485 | because we don't want the address pointer to change between the write | |
486 | byte and the read byte transactions. */ | |
8256fe0f JD |
487 | static int lm90_read_reg(struct i2c_client* client, u8 reg, u8 *value) |
488 | { | |
489 | int err; | |
490 | ||
c3df5806 JD |
491 | if (client->flags & I2C_CLIENT_PEC) { |
492 | err = adm1032_write_byte(client, reg); | |
493 | if (err >= 0) | |
494 | err = i2c_smbus_read_byte(client); | |
495 | } else | |
496 | err = i2c_smbus_read_byte_data(client, reg); | |
8256fe0f JD |
497 | |
498 | if (err < 0) { | |
499 | dev_warn(&client->dev, "Register %#02x read failed (%d)\n", | |
500 | reg, err); | |
501 | return err; | |
502 | } | |
503 | *value = err; | |
504 | ||
505 | return 0; | |
506 | } | |
507 | ||
9b0e8526 JD |
508 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
509 | static int lm90_detect(struct i2c_client *new_client, int kind, | |
510 | struct i2c_board_info *info) | |
1da177e4 | 511 | { |
9b0e8526 JD |
512 | struct i2c_adapter *adapter = new_client->adapter; |
513 | int address = new_client->addr; | |
1da177e4 LT |
514 | const char *name = ""; |
515 | ||
516 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
9b0e8526 | 517 | return -ENODEV; |
1da177e4 LT |
518 | |
519 | /* | |
520 | * Now we do the remaining detection. A negative kind means that | |
521 | * the driver was loaded with no force parameter (default), so we | |
522 | * must both detect and identify the chip. A zero kind means that | |
523 | * the driver was loaded with the force parameter, the detection | |
524 | * step shall be skipped. A positive kind means that the driver | |
525 | * was loaded with the force parameter and a given kind of chip is | |
526 | * requested, so both the detection and the identification steps | |
527 | * are skipped. | |
528 | */ | |
529 | ||
530 | /* Default to an LM90 if forced */ | |
531 | if (kind == 0) | |
532 | kind = lm90; | |
533 | ||
534 | if (kind < 0) { /* detection and identification */ | |
e0ae87a4 JD |
535 | int man_id, chip_id, reg_config1, reg_convrate; |
536 | ||
537 | if ((man_id = i2c_smbus_read_byte_data(new_client, | |
538 | LM90_REG_R_MAN_ID)) < 0 | |
539 | || (chip_id = i2c_smbus_read_byte_data(new_client, | |
540 | LM90_REG_R_CHIP_ID)) < 0 | |
541 | || (reg_config1 = i2c_smbus_read_byte_data(new_client, | |
542 | LM90_REG_R_CONFIG1)) < 0 | |
543 | || (reg_convrate = i2c_smbus_read_byte_data(new_client, | |
544 | LM90_REG_R_CONVRATE)) < 0) | |
9b0e8526 | 545 | return -ENODEV; |
1da177e4 | 546 | |
32c82a93 RB |
547 | if ((address == 0x4C || address == 0x4D) |
548 | && man_id == 0x01) { /* National Semiconductor */ | |
e0ae87a4 | 549 | int reg_config2; |
1da177e4 | 550 | |
e0ae87a4 JD |
551 | if ((reg_config2 = i2c_smbus_read_byte_data(new_client, |
552 | LM90_REG_R_CONFIG2)) < 0) | |
9b0e8526 | 553 | return -ENODEV; |
1da177e4 LT |
554 | |
555 | if ((reg_config1 & 0x2A) == 0x00 | |
556 | && (reg_config2 & 0xF8) == 0x00 | |
557 | && reg_convrate <= 0x09) { | |
558 | if (address == 0x4C | |
559 | && (chip_id & 0xF0) == 0x20) { /* LM90 */ | |
560 | kind = lm90; | |
561 | } else | |
562 | if ((chip_id & 0xF0) == 0x30) { /* LM89/LM99 */ | |
563 | kind = lm99; | |
564 | } else | |
565 | if (address == 0x4C | |
566 | && (chip_id & 0xF0) == 0x10) { /* LM86 */ | |
567 | kind = lm86; | |
568 | } | |
569 | } | |
570 | } else | |
32c82a93 RB |
571 | if ((address == 0x4C || address == 0x4D) |
572 | && man_id == 0x41) { /* Analog Devices */ | |
90209b42 | 573 | if ((chip_id & 0xF0) == 0x40 /* ADM1032 */ |
1da177e4 LT |
574 | && (reg_config1 & 0x3F) == 0x00 |
575 | && reg_convrate <= 0x0A) { | |
576 | kind = adm1032; | |
577 | } else | |
90209b42 | 578 | if (chip_id == 0x51 /* ADT7461 */ |
1da177e4 LT |
579 | && (reg_config1 & 0x1F) == 0x00 /* check compat mode */ |
580 | && reg_convrate <= 0x0A) { | |
581 | kind = adt7461; | |
582 | } | |
583 | } else | |
584 | if (man_id == 0x4D) { /* Maxim */ | |
585 | /* | |
32c82a93 RB |
586 | * The MAX6657, MAX6658 and MAX6659 do NOT have a |
587 | * chip_id register. Reading from that address will | |
588 | * return the last read value, which in our case is | |
589 | * those of the man_id register. Likewise, the config1 | |
590 | * register seems to lack a low nibble, so the value | |
591 | * will be those of the previous read, so in our case | |
592 | * those of the man_id register. | |
1da177e4 LT |
593 | */ |
594 | if (chip_id == man_id | |
f5744e37 | 595 | && (address == 0x4C || address == 0x4D) |
1da177e4 LT |
596 | && (reg_config1 & 0x1F) == (man_id & 0x0F) |
597 | && reg_convrate <= 0x09) { | |
598 | kind = max6657; | |
32c82a93 RB |
599 | } else |
600 | /* The chip_id register of the MAX6680 and MAX6681 | |
601 | * holds the revision of the chip. | |
602 | * the lowest bit of the config1 register is unused | |
603 | * and should return zero when read, so should the | |
604 | * second to last bit of config1 (software reset) | |
605 | */ | |
606 | if (chip_id == 0x01 | |
607 | && (reg_config1 & 0x03) == 0x00 | |
608 | && reg_convrate <= 0x07) { | |
609 | kind = max6680; | |
1da177e4 LT |
610 | } |
611 | } | |
612 | ||
613 | if (kind <= 0) { /* identification failed */ | |
614 | dev_info(&adapter->dev, | |
615 | "Unsupported chip (man_id=0x%02X, " | |
616 | "chip_id=0x%02X).\n", man_id, chip_id); | |
9b0e8526 | 617 | return -ENODEV; |
1da177e4 LT |
618 | } |
619 | } | |
620 | ||
9b0e8526 | 621 | /* Fill the i2c board info */ |
1da177e4 LT |
622 | if (kind == lm90) { |
623 | name = "lm90"; | |
624 | } else if (kind == adm1032) { | |
625 | name = "adm1032"; | |
c3df5806 JD |
626 | /* The ADM1032 supports PEC, but only if combined |
627 | transactions are not used. */ | |
628 | if (i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE)) | |
9b0e8526 | 629 | info->flags |= I2C_CLIENT_PEC; |
1da177e4 LT |
630 | } else if (kind == lm99) { |
631 | name = "lm99"; | |
632 | } else if (kind == lm86) { | |
633 | name = "lm86"; | |
634 | } else if (kind == max6657) { | |
635 | name = "max6657"; | |
32c82a93 RB |
636 | } else if (kind == max6680) { |
637 | name = "max6680"; | |
1da177e4 LT |
638 | } else if (kind == adt7461) { |
639 | name = "adt7461"; | |
640 | } | |
9b0e8526 JD |
641 | strlcpy(info->type, name, I2C_NAME_SIZE); |
642 | ||
643 | return 0; | |
644 | } | |
645 | ||
646 | static int lm90_probe(struct i2c_client *new_client, | |
647 | const struct i2c_device_id *id) | |
648 | { | |
649 | struct i2c_adapter *adapter = to_i2c_adapter(new_client->dev.parent); | |
650 | struct lm90_data *data; | |
651 | int err; | |
1da177e4 | 652 | |
9b0e8526 JD |
653 | data = kzalloc(sizeof(struct lm90_data), GFP_KERNEL); |
654 | if (!data) { | |
655 | err = -ENOMEM; | |
656 | goto exit; | |
657 | } | |
658 | i2c_set_clientdata(new_client, data); | |
9a61bf63 | 659 | mutex_init(&data->update_lock); |
1da177e4 | 660 | |
9b0e8526 JD |
661 | /* Set the device type */ |
662 | data->kind = id->driver_data; | |
663 | if (data->kind == adm1032) { | |
664 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE)) | |
665 | new_client->flags &= ~I2C_CLIENT_PEC; | |
666 | } | |
1da177e4 LT |
667 | |
668 | /* Initialize the LM90 chip */ | |
669 | lm90_init_client(new_client); | |
670 | ||
671 | /* Register sysfs hooks */ | |
0e39e01c | 672 | if ((err = sysfs_create_group(&new_client->dev.kobj, &lm90_group))) |
9b0e8526 | 673 | goto exit_free; |
0e39e01c JD |
674 | if (new_client->flags & I2C_CLIENT_PEC) { |
675 | if ((err = device_create_file(&new_client->dev, | |
676 | &dev_attr_pec))) | |
677 | goto exit_remove_files; | |
678 | } | |
69f2f96d JD |
679 | if (data->kind != max6657) { |
680 | if ((err = device_create_file(&new_client->dev, | |
681 | &sensor_dev_attr_temp2_offset.dev_attr))) | |
682 | goto exit_remove_files; | |
683 | } | |
0e39e01c | 684 | |
1beeffe4 TJ |
685 | data->hwmon_dev = hwmon_device_register(&new_client->dev); |
686 | if (IS_ERR(data->hwmon_dev)) { | |
687 | err = PTR_ERR(data->hwmon_dev); | |
0e39e01c | 688 | goto exit_remove_files; |
943b0830 MH |
689 | } |
690 | ||
1da177e4 LT |
691 | return 0; |
692 | ||
0e39e01c JD |
693 | exit_remove_files: |
694 | sysfs_remove_group(&new_client->dev.kobj, &lm90_group); | |
695 | device_remove_file(&new_client->dev, &dev_attr_pec); | |
1da177e4 LT |
696 | exit_free: |
697 | kfree(data); | |
698 | exit: | |
699 | return err; | |
700 | } | |
701 | ||
702 | static void lm90_init_client(struct i2c_client *client) | |
703 | { | |
32c82a93 RB |
704 | u8 config, config_orig; |
705 | struct lm90_data *data = i2c_get_clientdata(client); | |
1da177e4 LT |
706 | |
707 | /* | |
708 | * Start the conversions. | |
709 | */ | |
710 | i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE, | |
711 | 5); /* 2 Hz */ | |
8256fe0f JD |
712 | if (lm90_read_reg(client, LM90_REG_R_CONFIG1, &config) < 0) { |
713 | dev_warn(&client->dev, "Initialization failed!\n"); | |
714 | return; | |
715 | } | |
32c82a93 RB |
716 | config_orig = config; |
717 | ||
718 | /* | |
719 | * Put MAX6680/MAX8881 into extended resolution (bit 0x10, | |
720 | * 0.125 degree resolution) and range (0x08, extend range | |
721 | * to -64 degree) mode for the remote temperature sensor. | |
722 | */ | |
723 | if (data->kind == max6680) { | |
724 | config |= 0x18; | |
725 | } | |
726 | ||
727 | config &= 0xBF; /* run */ | |
728 | if (config != config_orig) /* Only write if changed */ | |
729 | i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, config); | |
1da177e4 LT |
730 | } |
731 | ||
9b0e8526 | 732 | static int lm90_remove(struct i2c_client *client) |
1da177e4 | 733 | { |
943b0830 | 734 | struct lm90_data *data = i2c_get_clientdata(client); |
1da177e4 | 735 | |
1beeffe4 | 736 | hwmon_device_unregister(data->hwmon_dev); |
0e39e01c JD |
737 | sysfs_remove_group(&client->dev.kobj, &lm90_group); |
738 | device_remove_file(&client->dev, &dev_attr_pec); | |
69f2f96d JD |
739 | if (data->kind != max6657) |
740 | device_remove_file(&client->dev, | |
741 | &sensor_dev_attr_temp2_offset.dev_attr); | |
943b0830 | 742 | |
943b0830 | 743 | kfree(data); |
1da177e4 LT |
744 | return 0; |
745 | } | |
746 | ||
6388a388 JD |
747 | static int lm90_read16(struct i2c_client *client, u8 regh, u8 regl, u16 *value) |
748 | { | |
749 | int err; | |
750 | u8 oldh, newh, l; | |
751 | ||
752 | /* | |
753 | * There is a trick here. We have to read two registers to have the | |
754 | * sensor temperature, but we have to beware a conversion could occur | |
755 | * inbetween the readings. The datasheet says we should either use | |
756 | * the one-shot conversion register, which we don't want to do | |
757 | * (disables hardware monitoring) or monitor the busy bit, which is | |
758 | * impossible (we can't read the values and monitor that bit at the | |
759 | * exact same time). So the solution used here is to read the high | |
760 | * byte once, then the low byte, then the high byte again. If the new | |
761 | * high byte matches the old one, then we have a valid reading. Else | |
762 | * we have to read the low byte again, and now we believe we have a | |
763 | * correct reading. | |
764 | */ | |
765 | if ((err = lm90_read_reg(client, regh, &oldh)) | |
766 | || (err = lm90_read_reg(client, regl, &l)) | |
767 | || (err = lm90_read_reg(client, regh, &newh))) | |
768 | return err; | |
769 | if (oldh != newh) { | |
770 | err = lm90_read_reg(client, regl, &l); | |
771 | if (err) | |
772 | return err; | |
773 | } | |
774 | *value = (newh << 8) | l; | |
775 | ||
776 | return 0; | |
777 | } | |
778 | ||
1da177e4 LT |
779 | static struct lm90_data *lm90_update_device(struct device *dev) |
780 | { | |
781 | struct i2c_client *client = to_i2c_client(dev); | |
782 | struct lm90_data *data = i2c_get_clientdata(client); | |
783 | ||
9a61bf63 | 784 | mutex_lock(&data->update_lock); |
1da177e4 LT |
785 | |
786 | if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) { | |
6388a388 | 787 | u8 h, l; |
1da177e4 LT |
788 | |
789 | dev_dbg(&client->dev, "Updating lm90 data.\n"); | |
f65e1708 JD |
790 | lm90_read_reg(client, LM90_REG_R_LOCAL_LOW, &data->temp8[0]); |
791 | lm90_read_reg(client, LM90_REG_R_LOCAL_HIGH, &data->temp8[1]); | |
792 | lm90_read_reg(client, LM90_REG_R_LOCAL_CRIT, &data->temp8[2]); | |
793 | lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT, &data->temp8[3]); | |
8256fe0f | 794 | lm90_read_reg(client, LM90_REG_R_TCRIT_HYST, &data->temp_hyst); |
1da177e4 | 795 | |
f65e1708 JD |
796 | if (data->kind == max6657) { |
797 | lm90_read16(client, LM90_REG_R_LOCAL_TEMP, | |
798 | MAX6657_REG_R_LOCAL_TEMPL, | |
799 | &data->temp11[4]); | |
800 | } else { | |
801 | if (lm90_read_reg(client, LM90_REG_R_LOCAL_TEMP, | |
802 | &h) == 0) | |
803 | data->temp11[4] = h << 8; | |
804 | } | |
6388a388 JD |
805 | lm90_read16(client, LM90_REG_R_REMOTE_TEMPH, |
806 | LM90_REG_R_REMOTE_TEMPL, &data->temp11[0]); | |
807 | ||
5f502a83 JD |
808 | if (lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &h) == 0) { |
809 | data->temp11[1] = h << 8; | |
810 | if (data->kind != max6657 && data->kind != max6680 | |
811 | && lm90_read_reg(client, LM90_REG_R_REMOTE_LOWL, | |
812 | &l) == 0) | |
813 | data->temp11[1] |= l; | |
814 | } | |
815 | if (lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &h) == 0) { | |
816 | data->temp11[2] = h << 8; | |
817 | if (data->kind != max6657 && data->kind != max6680 | |
818 | && lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHL, | |
819 | &l) == 0) | |
820 | data->temp11[2] |= l; | |
821 | } | |
822 | ||
69f2f96d JD |
823 | if (data->kind != max6657) { |
824 | if (lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSH, | |
6388a388 | 825 | &h) == 0 |
69f2f96d JD |
826 | && lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSL, |
827 | &l) == 0) | |
6388a388 | 828 | data->temp11[3] = (h << 8) | l; |
69f2f96d | 829 | } |
8256fe0f | 830 | lm90_read_reg(client, LM90_REG_R_STATUS, &data->alarms); |
1da177e4 LT |
831 | |
832 | data->last_updated = jiffies; | |
833 | data->valid = 1; | |
834 | } | |
835 | ||
9a61bf63 | 836 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
837 | |
838 | return data; | |
839 | } | |
840 | ||
841 | static int __init sensors_lm90_init(void) | |
842 | { | |
843 | return i2c_add_driver(&lm90_driver); | |
844 | } | |
845 | ||
846 | static void __exit sensors_lm90_exit(void) | |
847 | { | |
848 | i2c_del_driver(&lm90_driver); | |
849 | } | |
850 | ||
851 | MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>"); | |
852 | MODULE_DESCRIPTION("LM90/ADM1032 driver"); | |
853 | MODULE_LICENSE("GPL"); | |
854 | ||
855 | module_init(sensors_lm90_init); | |
856 | module_exit(sensors_lm90_exit); |