Commit | Line | Data |
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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 | |
97ae60bb | 15 | * degrees, which allows for higher temperatures measurement. |
44bbe87e | 16 | * Note that there is no way to differentiate between both chips. |
97ae60bb | 17 | * When device is auto-detected, the driver will assume an LM99. |
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 | * |
1a51e068 DW |
35 | * This driver also supports the MAX6646, MAX6647, MAX6648, MAX6649 and |
36 | * MAX6692 chips made by Maxim. These are again similar to the LM86, | |
37 | * but they use unsigned temperature values and can report temperatures | |
38 | * from 0 to 145 degrees. | |
271dabf5 | 39 | * |
32c82a93 RB |
40 | * This driver also supports the MAX6680 and MAX6681, two other sensor |
41 | * chips made by Maxim. These are quite similar to the other Maxim | |
a874a10c JD |
42 | * chips. The MAX6680 and MAX6681 only differ in the pinout so they can |
43 | * be treated identically. | |
32c82a93 | 44 | * |
23b2d477 NC |
45 | * This driver also supports the ADT7461 chip from Analog Devices. |
46 | * It's supported in both compatibility and extended mode. It is mostly | |
47 | * compatible with LM90 except for a data format difference for the | |
48 | * temperature value registers. | |
1da177e4 LT |
49 | * |
50 | * Since the LM90 was the first chipset supported by this driver, most | |
51 | * comments will refer to this chipset, but are actually general and | |
52 | * concern all supported chipsets, unless mentioned otherwise. | |
53 | * | |
54 | * This program is free software; you can redistribute it and/or modify | |
55 | * it under the terms of the GNU General Public License as published by | |
56 | * the Free Software Foundation; either version 2 of the License, or | |
57 | * (at your option) any later version. | |
58 | * | |
59 | * This program is distributed in the hope that it will be useful, | |
60 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
61 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
62 | * GNU General Public License for more details. | |
63 | * | |
64 | * You should have received a copy of the GNU General Public License | |
65 | * along with this program; if not, write to the Free Software | |
66 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
67 | */ | |
68 | ||
1da177e4 LT |
69 | #include <linux/module.h> |
70 | #include <linux/init.h> | |
71 | #include <linux/slab.h> | |
72 | #include <linux/jiffies.h> | |
73 | #include <linux/i2c.h> | |
10c08f81 | 74 | #include <linux/hwmon-sysfs.h> |
943b0830 MH |
75 | #include <linux/hwmon.h> |
76 | #include <linux/err.h> | |
9a61bf63 | 77 | #include <linux/mutex.h> |
0e39e01c | 78 | #include <linux/sysfs.h> |
1da177e4 LT |
79 | |
80 | /* | |
81 | * Addresses to scan | |
82 | * Address is fully defined internally and cannot be changed except for | |
32c82a93 | 83 | * MAX6659, MAX6680 and MAX6681. |
271dabf5 BH |
84 | * LM86, LM89, LM90, LM99, ADM1032, ADM1032-1, ADT7461, MAX6649, MAX6657 |
85 | * and MAX6658 have address 0x4c. | |
86 | * ADM1032-2, ADT7461-2, LM89-1, LM99-1 and MAX6646 have address 0x4d. | |
87 | * MAX6647 has address 0x4e. | |
1da177e4 | 88 | * MAX6659 can have address 0x4c, 0x4d or 0x4e (unsupported). |
32c82a93 RB |
89 | * MAX6680 and MAX6681 can have address 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, |
90 | * 0x4c, 0x4d or 0x4e. | |
1da177e4 LT |
91 | */ |
92 | ||
25e9c86d MH |
93 | static const unsigned short normal_i2c[] = { |
94 | 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END }; | |
1da177e4 LT |
95 | |
96 | /* | |
97 | * Insmod parameters | |
98 | */ | |
99 | ||
271dabf5 BH |
100 | I2C_CLIENT_INSMOD_8(lm90, adm1032, lm99, lm86, max6657, adt7461, max6680, |
101 | max6646); | |
1da177e4 LT |
102 | |
103 | /* | |
104 | * The LM90 registers | |
105 | */ | |
106 | ||
107 | #define LM90_REG_R_MAN_ID 0xFE | |
108 | #define LM90_REG_R_CHIP_ID 0xFF | |
109 | #define LM90_REG_R_CONFIG1 0x03 | |
110 | #define LM90_REG_W_CONFIG1 0x09 | |
111 | #define LM90_REG_R_CONFIG2 0xBF | |
112 | #define LM90_REG_W_CONFIG2 0xBF | |
113 | #define LM90_REG_R_CONVRATE 0x04 | |
114 | #define LM90_REG_W_CONVRATE 0x0A | |
115 | #define LM90_REG_R_STATUS 0x02 | |
116 | #define LM90_REG_R_LOCAL_TEMP 0x00 | |
117 | #define LM90_REG_R_LOCAL_HIGH 0x05 | |
118 | #define LM90_REG_W_LOCAL_HIGH 0x0B | |
119 | #define LM90_REG_R_LOCAL_LOW 0x06 | |
120 | #define LM90_REG_W_LOCAL_LOW 0x0C | |
121 | #define LM90_REG_R_LOCAL_CRIT 0x20 | |
122 | #define LM90_REG_W_LOCAL_CRIT 0x20 | |
123 | #define LM90_REG_R_REMOTE_TEMPH 0x01 | |
124 | #define LM90_REG_R_REMOTE_TEMPL 0x10 | |
125 | #define LM90_REG_R_REMOTE_OFFSH 0x11 | |
126 | #define LM90_REG_W_REMOTE_OFFSH 0x11 | |
127 | #define LM90_REG_R_REMOTE_OFFSL 0x12 | |
128 | #define LM90_REG_W_REMOTE_OFFSL 0x12 | |
129 | #define LM90_REG_R_REMOTE_HIGHH 0x07 | |
130 | #define LM90_REG_W_REMOTE_HIGHH 0x0D | |
131 | #define LM90_REG_R_REMOTE_HIGHL 0x13 | |
132 | #define LM90_REG_W_REMOTE_HIGHL 0x13 | |
133 | #define LM90_REG_R_REMOTE_LOWH 0x08 | |
134 | #define LM90_REG_W_REMOTE_LOWH 0x0E | |
135 | #define LM90_REG_R_REMOTE_LOWL 0x14 | |
136 | #define LM90_REG_W_REMOTE_LOWL 0x14 | |
137 | #define LM90_REG_R_REMOTE_CRIT 0x19 | |
138 | #define LM90_REG_W_REMOTE_CRIT 0x19 | |
139 | #define LM90_REG_R_TCRIT_HYST 0x21 | |
140 | #define LM90_REG_W_TCRIT_HYST 0x21 | |
141 | ||
271dabf5 | 142 | /* MAX6646/6647/6649/6657/6658/6659 registers */ |
f65e1708 JD |
143 | |
144 | #define MAX6657_REG_R_LOCAL_TEMPL 0x11 | |
145 | ||
23b2d477 NC |
146 | /* |
147 | * Device flags | |
148 | */ | |
149 | #define LM90_FLAG_ADT7461_EXT 0x01 /* ADT7461 extended mode */ | |
150 | ||
1da177e4 LT |
151 | /* |
152 | * Functions declaration | |
153 | */ | |
154 | ||
9b0e8526 JD |
155 | static int lm90_detect(struct i2c_client *client, int kind, |
156 | struct i2c_board_info *info); | |
157 | static int lm90_probe(struct i2c_client *client, | |
158 | const struct i2c_device_id *id); | |
1da177e4 | 159 | static void lm90_init_client(struct i2c_client *client); |
9b0e8526 | 160 | static int lm90_remove(struct i2c_client *client); |
1da177e4 LT |
161 | static struct lm90_data *lm90_update_device(struct device *dev); |
162 | ||
163 | /* | |
164 | * Driver data (common to all clients) | |
165 | */ | |
166 | ||
9b0e8526 JD |
167 | static const struct i2c_device_id lm90_id[] = { |
168 | { "adm1032", adm1032 }, | |
169 | { "adt7461", adt7461 }, | |
170 | { "lm90", lm90 }, | |
171 | { "lm86", lm86 }, | |
97ae60bb JD |
172 | { "lm89", lm86 }, |
173 | { "lm99", lm99 }, | |
271dabf5 BH |
174 | { "max6646", max6646 }, |
175 | { "max6647", max6646 }, | |
176 | { "max6649", max6646 }, | |
9b0e8526 JD |
177 | { "max6657", max6657 }, |
178 | { "max6658", max6657 }, | |
179 | { "max6659", max6657 }, | |
180 | { "max6680", max6680 }, | |
181 | { "max6681", max6680 }, | |
182 | { } | |
183 | }; | |
184 | MODULE_DEVICE_TABLE(i2c, lm90_id); | |
185 | ||
1da177e4 | 186 | static struct i2c_driver lm90_driver = { |
9b0e8526 | 187 | .class = I2C_CLASS_HWMON, |
cdaf7934 | 188 | .driver = { |
cdaf7934 LR |
189 | .name = "lm90", |
190 | }, | |
9b0e8526 JD |
191 | .probe = lm90_probe, |
192 | .remove = lm90_remove, | |
193 | .id_table = lm90_id, | |
194 | .detect = lm90_detect, | |
195 | .address_data = &addr_data, | |
1da177e4 LT |
196 | }; |
197 | ||
198 | /* | |
199 | * Client data (each client gets its own) | |
200 | */ | |
201 | ||
202 | struct lm90_data { | |
1beeffe4 | 203 | struct device *hwmon_dev; |
9a61bf63 | 204 | struct mutex update_lock; |
1da177e4 LT |
205 | char valid; /* zero until following fields are valid */ |
206 | unsigned long last_updated; /* in jiffies */ | |
207 | int kind; | |
23b2d477 | 208 | int flags; |
1da177e4 LT |
209 | |
210 | /* registers values */ | |
f65e1708 JD |
211 | s8 temp8[4]; /* 0: local low limit |
212 | 1: local high limit | |
213 | 2: local critical limit | |
214 | 3: remote critical limit */ | |
215 | s16 temp11[5]; /* 0: remote input | |
30d7394b | 216 | 1: remote low limit |
69f2f96d | 217 | 2: remote high limit |
271dabf5 | 218 | 3: remote offset (except max6646 and max6657) |
f65e1708 | 219 | 4: local input */ |
1da177e4 LT |
220 | u8 temp_hyst; |
221 | u8 alarms; /* bitvector */ | |
222 | }; | |
223 | ||
cea50fe2 NC |
224 | /* |
225 | * Conversions | |
226 | * For local temperatures and limits, critical limits and the hysteresis | |
227 | * value, the LM90 uses signed 8-bit values with LSB = 1 degree Celsius. | |
228 | * For remote temperatures and limits, it uses signed 11-bit values with | |
271dabf5 BH |
229 | * LSB = 0.125 degree Celsius, left-justified in 16-bit registers. Some |
230 | * Maxim chips use unsigned values. | |
cea50fe2 NC |
231 | */ |
232 | ||
9d4d3834 | 233 | static inline int temp_from_s8(s8 val) |
cea50fe2 NC |
234 | { |
235 | return val * 1000; | |
236 | } | |
237 | ||
271dabf5 BH |
238 | static inline int temp_from_u8(u8 val) |
239 | { | |
240 | return val * 1000; | |
241 | } | |
242 | ||
9d4d3834 | 243 | static inline int temp_from_s16(s16 val) |
cea50fe2 NC |
244 | { |
245 | return val / 32 * 125; | |
246 | } | |
247 | ||
271dabf5 BH |
248 | static inline int temp_from_u16(u16 val) |
249 | { | |
250 | return val / 32 * 125; | |
251 | } | |
252 | ||
9d4d3834 | 253 | static s8 temp_to_s8(long val) |
cea50fe2 NC |
254 | { |
255 | if (val <= -128000) | |
256 | return -128; | |
257 | if (val >= 127000) | |
258 | return 127; | |
259 | if (val < 0) | |
260 | return (val - 500) / 1000; | |
261 | return (val + 500) / 1000; | |
262 | } | |
263 | ||
271dabf5 BH |
264 | static u8 temp_to_u8(long val) |
265 | { | |
266 | if (val <= 0) | |
267 | return 0; | |
268 | if (val >= 255000) | |
269 | return 255; | |
270 | return (val + 500) / 1000; | |
271 | } | |
272 | ||
9d4d3834 | 273 | static s16 temp_to_s16(long val) |
cea50fe2 NC |
274 | { |
275 | if (val <= -128000) | |
276 | return 0x8000; | |
277 | if (val >= 127875) | |
278 | return 0x7FE0; | |
279 | if (val < 0) | |
280 | return (val - 62) / 125 * 32; | |
281 | return (val + 62) / 125 * 32; | |
282 | } | |
283 | ||
284 | static u8 hyst_to_reg(long val) | |
285 | { | |
286 | if (val <= 0) | |
287 | return 0; | |
288 | if (val >= 30500) | |
289 | return 31; | |
290 | return (val + 500) / 1000; | |
291 | } | |
292 | ||
293 | /* | |
23b2d477 NC |
294 | * ADT7461 in compatibility mode is almost identical to LM90 except that |
295 | * attempts to write values that are outside the range 0 < temp < 127 are | |
296 | * treated as the boundary value. | |
297 | * | |
298 | * ADT7461 in "extended mode" operation uses unsigned integers offset by | |
299 | * 64 (e.g., 0 -> -64 degC). The range is restricted to -64..191 degC. | |
cea50fe2 | 300 | */ |
9d4d3834 | 301 | static inline int temp_from_u8_adt7461(struct lm90_data *data, u8 val) |
cea50fe2 | 302 | { |
23b2d477 NC |
303 | if (data->flags & LM90_FLAG_ADT7461_EXT) |
304 | return (val - 64) * 1000; | |
305 | else | |
9d4d3834 | 306 | return temp_from_s8(val); |
cea50fe2 NC |
307 | } |
308 | ||
9d4d3834 | 309 | static inline int temp_from_u16_adt7461(struct lm90_data *data, u16 val) |
cea50fe2 | 310 | { |
23b2d477 NC |
311 | if (data->flags & LM90_FLAG_ADT7461_EXT) |
312 | return (val - 0x4000) / 64 * 250; | |
313 | else | |
9d4d3834 | 314 | return temp_from_s16(val); |
23b2d477 NC |
315 | } |
316 | ||
9d4d3834 | 317 | static u8 temp_to_u8_adt7461(struct lm90_data *data, long val) |
23b2d477 NC |
318 | { |
319 | if (data->flags & LM90_FLAG_ADT7461_EXT) { | |
320 | if (val <= -64000) | |
321 | return 0; | |
322 | if (val >= 191000) | |
323 | return 0xFF; | |
324 | return (val + 500 + 64000) / 1000; | |
325 | } else { | |
326 | if (val <= 0) | |
327 | return 0; | |
328 | if (val >= 127000) | |
329 | return 127; | |
330 | return (val + 500) / 1000; | |
331 | } | |
332 | } | |
333 | ||
9d4d3834 | 334 | static u16 temp_to_u16_adt7461(struct lm90_data *data, long val) |
23b2d477 NC |
335 | { |
336 | if (data->flags & LM90_FLAG_ADT7461_EXT) { | |
337 | if (val <= -64000) | |
338 | return 0; | |
339 | if (val >= 191750) | |
340 | return 0xFFC0; | |
341 | return (val + 64000 + 125) / 250 * 64; | |
342 | } else { | |
343 | if (val <= 0) | |
344 | return 0; | |
345 | if (val >= 127750) | |
346 | return 0x7FC0; | |
347 | return (val + 125) / 250 * 64; | |
348 | } | |
cea50fe2 NC |
349 | } |
350 | ||
1da177e4 LT |
351 | /* |
352 | * Sysfs stuff | |
353 | */ | |
354 | ||
30d7394b JD |
355 | static ssize_t show_temp8(struct device *dev, struct device_attribute *devattr, |
356 | char *buf) | |
357 | { | |
358 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
359 | struct lm90_data *data = lm90_update_device(dev); | |
23b2d477 NC |
360 | int temp; |
361 | ||
362 | if (data->kind == adt7461) | |
9d4d3834 | 363 | temp = temp_from_u8_adt7461(data, data->temp8[attr->index]); |
271dabf5 BH |
364 | else if (data->kind == max6646) |
365 | temp = temp_from_u8(data->temp8[attr->index]); | |
23b2d477 | 366 | else |
9d4d3834 | 367 | temp = temp_from_s8(data->temp8[attr->index]); |
23b2d477 | 368 | |
97ae60bb JD |
369 | /* +16 degrees offset for temp2 for the LM99 */ |
370 | if (data->kind == lm99 && attr->index == 3) | |
371 | temp += 16000; | |
372 | ||
23b2d477 | 373 | return sprintf(buf, "%d\n", temp); |
30d7394b JD |
374 | } |
375 | ||
376 | static ssize_t set_temp8(struct device *dev, struct device_attribute *devattr, | |
377 | const char *buf, size_t count) | |
378 | { | |
379 | static const u8 reg[4] = { | |
380 | LM90_REG_W_LOCAL_LOW, | |
381 | LM90_REG_W_LOCAL_HIGH, | |
382 | LM90_REG_W_LOCAL_CRIT, | |
383 | LM90_REG_W_REMOTE_CRIT, | |
384 | }; | |
385 | ||
386 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
387 | struct i2c_client *client = to_i2c_client(dev); | |
388 | struct lm90_data *data = i2c_get_clientdata(client); | |
389 | long val = simple_strtol(buf, NULL, 10); | |
390 | int nr = attr->index; | |
391 | ||
97ae60bb JD |
392 | /* +16 degrees offset for temp2 for the LM99 */ |
393 | if (data->kind == lm99 && attr->index == 3) | |
394 | val -= 16000; | |
395 | ||
9a61bf63 | 396 | mutex_lock(&data->update_lock); |
30d7394b | 397 | if (data->kind == adt7461) |
9d4d3834 | 398 | data->temp8[nr] = temp_to_u8_adt7461(data, val); |
271dabf5 BH |
399 | else if (data->kind == max6646) |
400 | data->temp8[nr] = temp_to_u8(val); | |
30d7394b | 401 | else |
9d4d3834 | 402 | data->temp8[nr] = temp_to_s8(val); |
f65e1708 | 403 | i2c_smbus_write_byte_data(client, reg[nr], data->temp8[nr]); |
9a61bf63 | 404 | mutex_unlock(&data->update_lock); |
30d7394b | 405 | return count; |
1da177e4 | 406 | } |
30d7394b JD |
407 | |
408 | static ssize_t show_temp11(struct device *dev, struct device_attribute *devattr, | |
409 | char *buf) | |
410 | { | |
411 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
412 | struct lm90_data *data = lm90_update_device(dev); | |
23b2d477 NC |
413 | int temp; |
414 | ||
415 | if (data->kind == adt7461) | |
9d4d3834 | 416 | temp = temp_from_u16_adt7461(data, data->temp11[attr->index]); |
271dabf5 BH |
417 | else if (data->kind == max6646) |
418 | temp = temp_from_u16(data->temp11[attr->index]); | |
23b2d477 | 419 | else |
9d4d3834 | 420 | temp = temp_from_s16(data->temp11[attr->index]); |
23b2d477 | 421 | |
97ae60bb JD |
422 | /* +16 degrees offset for temp2 for the LM99 */ |
423 | if (data->kind == lm99 && attr->index <= 2) | |
424 | temp += 16000; | |
425 | ||
23b2d477 | 426 | return sprintf(buf, "%d\n", temp); |
1da177e4 | 427 | } |
30d7394b JD |
428 | |
429 | static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr, | |
430 | const char *buf, size_t count) | |
431 | { | |
69f2f96d | 432 | static const u8 reg[6] = { |
30d7394b JD |
433 | LM90_REG_W_REMOTE_LOWH, |
434 | LM90_REG_W_REMOTE_LOWL, | |
435 | LM90_REG_W_REMOTE_HIGHH, | |
436 | LM90_REG_W_REMOTE_HIGHL, | |
69f2f96d JD |
437 | LM90_REG_W_REMOTE_OFFSH, |
438 | LM90_REG_W_REMOTE_OFFSL, | |
30d7394b JD |
439 | }; |
440 | ||
441 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
442 | struct i2c_client *client = to_i2c_client(dev); | |
443 | struct lm90_data *data = i2c_get_clientdata(client); | |
444 | long val = simple_strtol(buf, NULL, 10); | |
445 | int nr = attr->index; | |
446 | ||
97ae60bb JD |
447 | /* +16 degrees offset for temp2 for the LM99 */ |
448 | if (data->kind == lm99 && attr->index <= 2) | |
449 | val -= 16000; | |
450 | ||
9a61bf63 | 451 | mutex_lock(&data->update_lock); |
30d7394b | 452 | if (data->kind == adt7461) |
9d4d3834 | 453 | data->temp11[nr] = temp_to_u16_adt7461(data, val); |
5f502a83 | 454 | else if (data->kind == max6657 || data->kind == max6680) |
9d4d3834 | 455 | data->temp11[nr] = temp_to_s8(val) << 8; |
271dabf5 BH |
456 | else if (data->kind == max6646) |
457 | data->temp11[nr] = temp_to_u8(val) << 8; | |
30d7394b | 458 | else |
9d4d3834 | 459 | data->temp11[nr] = temp_to_s16(val); |
5f502a83 | 460 | |
30d7394b JD |
461 | i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2], |
462 | data->temp11[nr] >> 8); | |
271dabf5 BH |
463 | if (data->kind != max6657 && data->kind != max6680 |
464 | && data->kind != max6646) | |
5f502a83 JD |
465 | i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2 + 1], |
466 | data->temp11[nr] & 0xff); | |
9a61bf63 | 467 | mutex_unlock(&data->update_lock); |
30d7394b | 468 | return count; |
1da177e4 | 469 | } |
30d7394b JD |
470 | |
471 | static ssize_t show_temphyst(struct device *dev, struct device_attribute *devattr, | |
472 | char *buf) | |
473 | { | |
474 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
475 | struct lm90_data *data = lm90_update_device(dev); | |
23b2d477 NC |
476 | int temp; |
477 | ||
478 | if (data->kind == adt7461) | |
9d4d3834 | 479 | temp = temp_from_u8_adt7461(data, data->temp8[attr->index]); |
ec38fa2b JD |
480 | else if (data->kind == max6646) |
481 | temp = temp_from_u8(data->temp8[attr->index]); | |
23b2d477 | 482 | else |
9d4d3834 | 483 | temp = temp_from_s8(data->temp8[attr->index]); |
23b2d477 | 484 | |
97ae60bb JD |
485 | /* +16 degrees offset for temp2 for the LM99 */ |
486 | if (data->kind == lm99 && attr->index == 3) | |
487 | temp += 16000; | |
488 | ||
9d4d3834 | 489 | return sprintf(buf, "%d\n", temp - temp_from_s8(data->temp_hyst)); |
1da177e4 | 490 | } |
1da177e4 | 491 | |
30d7394b JD |
492 | static ssize_t set_temphyst(struct device *dev, struct device_attribute *dummy, |
493 | const char *buf, size_t count) | |
1da177e4 LT |
494 | { |
495 | struct i2c_client *client = to_i2c_client(dev); | |
496 | struct lm90_data *data = i2c_get_clientdata(client); | |
497 | long val = simple_strtol(buf, NULL, 10); | |
ec38fa2b | 498 | int temp; |
1da177e4 | 499 | |
9a61bf63 | 500 | mutex_lock(&data->update_lock); |
ec38fa2b JD |
501 | if (data->kind == adt7461) |
502 | temp = temp_from_u8_adt7461(data, data->temp8[2]); | |
503 | else if (data->kind == max6646) | |
504 | temp = temp_from_u8(data->temp8[2]); | |
505 | else | |
506 | temp = temp_from_s8(data->temp8[2]); | |
507 | ||
508 | data->temp_hyst = hyst_to_reg(temp - val); | |
1da177e4 | 509 | i2c_smbus_write_byte_data(client, LM90_REG_W_TCRIT_HYST, |
ec38fa2b | 510 | data->temp_hyst); |
9a61bf63 | 511 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
512 | return count; |
513 | } | |
514 | ||
30d7394b JD |
515 | static ssize_t show_alarms(struct device *dev, struct device_attribute *dummy, |
516 | char *buf) | |
1da177e4 LT |
517 | { |
518 | struct lm90_data *data = lm90_update_device(dev); | |
519 | return sprintf(buf, "%d\n", data->alarms); | |
520 | } | |
521 | ||
2d45771e JD |
522 | static ssize_t show_alarm(struct device *dev, struct device_attribute |
523 | *devattr, char *buf) | |
524 | { | |
525 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
526 | struct lm90_data *data = lm90_update_device(dev); | |
527 | int bitnr = attr->index; | |
528 | ||
529 | return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1); | |
530 | } | |
531 | ||
f65e1708 | 532 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp11, NULL, 4); |
30d7394b JD |
533 | static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp11, NULL, 0); |
534 | static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp8, | |
f65e1708 | 535 | set_temp8, 0); |
30d7394b JD |
536 | static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp11, |
537 | set_temp11, 1); | |
538 | static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp8, | |
f65e1708 | 539 | set_temp8, 1); |
30d7394b JD |
540 | static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp11, |
541 | set_temp11, 2); | |
542 | static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp8, | |
f65e1708 | 543 | set_temp8, 2); |
30d7394b | 544 | static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp8, |
f65e1708 | 545 | set_temp8, 3); |
30d7394b | 546 | static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temphyst, |
f65e1708 JD |
547 | set_temphyst, 2); |
548 | static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temphyst, NULL, 3); | |
69f2f96d JD |
549 | static SENSOR_DEVICE_ATTR(temp2_offset, S_IWUSR | S_IRUGO, show_temp11, |
550 | set_temp11, 3); | |
2d45771e JD |
551 | |
552 | /* Individual alarm files */ | |
553 | static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 0); | |
554 | static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1); | |
7817a39e | 555 | static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2); |
2d45771e JD |
556 | static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3); |
557 | static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4); | |
558 | static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 5); | |
559 | static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6); | |
560 | /* Raw alarm file for compatibility */ | |
1da177e4 LT |
561 | static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); |
562 | ||
0e39e01c JD |
563 | static struct attribute *lm90_attributes[] = { |
564 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
565 | &sensor_dev_attr_temp2_input.dev_attr.attr, | |
566 | &sensor_dev_attr_temp1_min.dev_attr.attr, | |
567 | &sensor_dev_attr_temp2_min.dev_attr.attr, | |
568 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
569 | &sensor_dev_attr_temp2_max.dev_attr.attr, | |
570 | &sensor_dev_attr_temp1_crit.dev_attr.attr, | |
571 | &sensor_dev_attr_temp2_crit.dev_attr.attr, | |
572 | &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr, | |
573 | &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr, | |
574 | ||
575 | &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, | |
576 | &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr, | |
7817a39e | 577 | &sensor_dev_attr_temp2_fault.dev_attr.attr, |
0e39e01c JD |
578 | &sensor_dev_attr_temp2_min_alarm.dev_attr.attr, |
579 | &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, | |
580 | &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, | |
581 | &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, | |
582 | &dev_attr_alarms.attr, | |
583 | NULL | |
584 | }; | |
585 | ||
586 | static const struct attribute_group lm90_group = { | |
587 | .attrs = lm90_attributes, | |
588 | }; | |
589 | ||
c3df5806 JD |
590 | /* pec used for ADM1032 only */ |
591 | static ssize_t show_pec(struct device *dev, struct device_attribute *dummy, | |
592 | char *buf) | |
593 | { | |
594 | struct i2c_client *client = to_i2c_client(dev); | |
595 | return sprintf(buf, "%d\n", !!(client->flags & I2C_CLIENT_PEC)); | |
596 | } | |
597 | ||
598 | static ssize_t set_pec(struct device *dev, struct device_attribute *dummy, | |
599 | const char *buf, size_t count) | |
600 | { | |
601 | struct i2c_client *client = to_i2c_client(dev); | |
602 | long val = simple_strtol(buf, NULL, 10); | |
603 | ||
604 | switch (val) { | |
605 | case 0: | |
606 | client->flags &= ~I2C_CLIENT_PEC; | |
607 | break; | |
608 | case 1: | |
609 | client->flags |= I2C_CLIENT_PEC; | |
610 | break; | |
611 | default: | |
612 | return -EINVAL; | |
613 | } | |
614 | ||
615 | return count; | |
616 | } | |
617 | ||
618 | static DEVICE_ATTR(pec, S_IWUSR | S_IRUGO, show_pec, set_pec); | |
619 | ||
1da177e4 LT |
620 | /* |
621 | * Real code | |
622 | */ | |
623 | ||
c3df5806 | 624 | /* The ADM1032 supports PEC but not on write byte transactions, so we need |
0966415d | 625 | to explicitly ask for a transaction without PEC. */ |
c3df5806 JD |
626 | static inline s32 adm1032_write_byte(struct i2c_client *client, u8 value) |
627 | { | |
628 | return i2c_smbus_xfer(client->adapter, client->addr, | |
629 | client->flags & ~I2C_CLIENT_PEC, | |
630 | I2C_SMBUS_WRITE, value, I2C_SMBUS_BYTE, NULL); | |
631 | } | |
632 | ||
633 | /* It is assumed that client->update_lock is held (unless we are in | |
634 | detection or initialization steps). This matters when PEC is enabled, | |
635 | because we don't want the address pointer to change between the write | |
636 | byte and the read byte transactions. */ | |
8256fe0f JD |
637 | static int lm90_read_reg(struct i2c_client* client, u8 reg, u8 *value) |
638 | { | |
639 | int err; | |
640 | ||
c3df5806 JD |
641 | if (client->flags & I2C_CLIENT_PEC) { |
642 | err = adm1032_write_byte(client, reg); | |
643 | if (err >= 0) | |
644 | err = i2c_smbus_read_byte(client); | |
645 | } else | |
646 | err = i2c_smbus_read_byte_data(client, reg); | |
8256fe0f JD |
647 | |
648 | if (err < 0) { | |
649 | dev_warn(&client->dev, "Register %#02x read failed (%d)\n", | |
650 | reg, err); | |
651 | return err; | |
652 | } | |
653 | *value = err; | |
654 | ||
655 | return 0; | |
656 | } | |
657 | ||
9b0e8526 JD |
658 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
659 | static int lm90_detect(struct i2c_client *new_client, int kind, | |
660 | struct i2c_board_info *info) | |
1da177e4 | 661 | { |
9b0e8526 JD |
662 | struct i2c_adapter *adapter = new_client->adapter; |
663 | int address = new_client->addr; | |
1da177e4 LT |
664 | const char *name = ""; |
665 | ||
666 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
9b0e8526 | 667 | return -ENODEV; |
1da177e4 LT |
668 | |
669 | /* | |
670 | * Now we do the remaining detection. A negative kind means that | |
671 | * the driver was loaded with no force parameter (default), so we | |
672 | * must both detect and identify the chip. A zero kind means that | |
673 | * the driver was loaded with the force parameter, the detection | |
674 | * step shall be skipped. A positive kind means that the driver | |
675 | * was loaded with the force parameter and a given kind of chip is | |
676 | * requested, so both the detection and the identification steps | |
677 | * are skipped. | |
678 | */ | |
679 | ||
680 | /* Default to an LM90 if forced */ | |
681 | if (kind == 0) | |
682 | kind = lm90; | |
683 | ||
684 | if (kind < 0) { /* detection and identification */ | |
e0ae87a4 JD |
685 | int man_id, chip_id, reg_config1, reg_convrate; |
686 | ||
687 | if ((man_id = i2c_smbus_read_byte_data(new_client, | |
688 | LM90_REG_R_MAN_ID)) < 0 | |
689 | || (chip_id = i2c_smbus_read_byte_data(new_client, | |
690 | LM90_REG_R_CHIP_ID)) < 0 | |
691 | || (reg_config1 = i2c_smbus_read_byte_data(new_client, | |
692 | LM90_REG_R_CONFIG1)) < 0 | |
693 | || (reg_convrate = i2c_smbus_read_byte_data(new_client, | |
694 | LM90_REG_R_CONVRATE)) < 0) | |
9b0e8526 | 695 | return -ENODEV; |
1da177e4 | 696 | |
32c82a93 RB |
697 | if ((address == 0x4C || address == 0x4D) |
698 | && man_id == 0x01) { /* National Semiconductor */ | |
e0ae87a4 | 699 | int reg_config2; |
1da177e4 | 700 | |
e0ae87a4 JD |
701 | if ((reg_config2 = i2c_smbus_read_byte_data(new_client, |
702 | LM90_REG_R_CONFIG2)) < 0) | |
9b0e8526 | 703 | return -ENODEV; |
1da177e4 LT |
704 | |
705 | if ((reg_config1 & 0x2A) == 0x00 | |
706 | && (reg_config2 & 0xF8) == 0x00 | |
707 | && reg_convrate <= 0x09) { | |
708 | if (address == 0x4C | |
709 | && (chip_id & 0xF0) == 0x20) { /* LM90 */ | |
710 | kind = lm90; | |
711 | } else | |
712 | if ((chip_id & 0xF0) == 0x30) { /* LM89/LM99 */ | |
713 | kind = lm99; | |
97ae60bb JD |
714 | dev_info(&adapter->dev, |
715 | "Assuming LM99 chip at " | |
716 | "0x%02x\n", address); | |
717 | dev_info(&adapter->dev, | |
718 | "If it is an LM89, pass " | |
719 | "force_lm86=%d,0x%02x when " | |
720 | "loading the lm90 driver\n", | |
721 | i2c_adapter_id(adapter), | |
722 | address); | |
1da177e4 LT |
723 | } else |
724 | if (address == 0x4C | |
725 | && (chip_id & 0xF0) == 0x10) { /* LM86 */ | |
726 | kind = lm86; | |
727 | } | |
728 | } | |
729 | } else | |
32c82a93 RB |
730 | if ((address == 0x4C || address == 0x4D) |
731 | && man_id == 0x41) { /* Analog Devices */ | |
90209b42 | 732 | if ((chip_id & 0xF0) == 0x40 /* ADM1032 */ |
1da177e4 LT |
733 | && (reg_config1 & 0x3F) == 0x00 |
734 | && reg_convrate <= 0x0A) { | |
735 | kind = adm1032; | |
736 | } else | |
90209b42 | 737 | if (chip_id == 0x51 /* ADT7461 */ |
23b2d477 | 738 | && (reg_config1 & 0x1B) == 0x00 |
1da177e4 LT |
739 | && reg_convrate <= 0x0A) { |
740 | kind = adt7461; | |
741 | } | |
742 | } else | |
743 | if (man_id == 0x4D) { /* Maxim */ | |
744 | /* | |
32c82a93 RB |
745 | * The MAX6657, MAX6658 and MAX6659 do NOT have a |
746 | * chip_id register. Reading from that address will | |
747 | * return the last read value, which in our case is | |
748 | * those of the man_id register. Likewise, the config1 | |
749 | * register seems to lack a low nibble, so the value | |
750 | * will be those of the previous read, so in our case | |
751 | * those of the man_id register. | |
1da177e4 LT |
752 | */ |
753 | if (chip_id == man_id | |
f5744e37 | 754 | && (address == 0x4C || address == 0x4D) |
1da177e4 LT |
755 | && (reg_config1 & 0x1F) == (man_id & 0x0F) |
756 | && reg_convrate <= 0x09) { | |
757 | kind = max6657; | |
32c82a93 RB |
758 | } else |
759 | /* The chip_id register of the MAX6680 and MAX6681 | |
760 | * holds the revision of the chip. | |
761 | * the lowest bit of the config1 register is unused | |
762 | * and should return zero when read, so should the | |
763 | * second to last bit of config1 (software reset) | |
764 | */ | |
765 | if (chip_id == 0x01 | |
766 | && (reg_config1 & 0x03) == 0x00 | |
767 | && reg_convrate <= 0x07) { | |
768 | kind = max6680; | |
271dabf5 BH |
769 | } else |
770 | /* The chip_id register of the MAX6646/6647/6649 | |
771 | * holds the revision of the chip. | |
772 | * The lowest 6 bits of the config1 register are | |
773 | * unused and should return zero when read. | |
774 | */ | |
775 | if (chip_id == 0x59 | |
776 | && (reg_config1 & 0x3f) == 0x00 | |
777 | && reg_convrate <= 0x07) { | |
778 | kind = max6646; | |
1da177e4 LT |
779 | } |
780 | } | |
781 | ||
782 | if (kind <= 0) { /* identification failed */ | |
4b4e7a72 JD |
783 | dev_dbg(&adapter->dev, |
784 | "Unsupported chip at 0x%02x (man_id=0x%02X, " | |
785 | "chip_id=0x%02X)\n", address, man_id, chip_id); | |
9b0e8526 | 786 | return -ENODEV; |
1da177e4 LT |
787 | } |
788 | } | |
789 | ||
9b0e8526 | 790 | /* Fill the i2c board info */ |
1da177e4 LT |
791 | if (kind == lm90) { |
792 | name = "lm90"; | |
793 | } else if (kind == adm1032) { | |
794 | name = "adm1032"; | |
c3df5806 JD |
795 | /* The ADM1032 supports PEC, but only if combined |
796 | transactions are not used. */ | |
797 | if (i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE)) | |
9b0e8526 | 798 | info->flags |= I2C_CLIENT_PEC; |
1da177e4 LT |
799 | } else if (kind == lm99) { |
800 | name = "lm99"; | |
801 | } else if (kind == lm86) { | |
802 | name = "lm86"; | |
803 | } else if (kind == max6657) { | |
804 | name = "max6657"; | |
32c82a93 RB |
805 | } else if (kind == max6680) { |
806 | name = "max6680"; | |
1da177e4 LT |
807 | } else if (kind == adt7461) { |
808 | name = "adt7461"; | |
271dabf5 BH |
809 | } else if (kind == max6646) { |
810 | name = "max6646"; | |
1da177e4 | 811 | } |
9b0e8526 JD |
812 | strlcpy(info->type, name, I2C_NAME_SIZE); |
813 | ||
814 | return 0; | |
815 | } | |
816 | ||
817 | static int lm90_probe(struct i2c_client *new_client, | |
818 | const struct i2c_device_id *id) | |
819 | { | |
820 | struct i2c_adapter *adapter = to_i2c_adapter(new_client->dev.parent); | |
821 | struct lm90_data *data; | |
822 | int err; | |
1da177e4 | 823 | |
9b0e8526 JD |
824 | data = kzalloc(sizeof(struct lm90_data), GFP_KERNEL); |
825 | if (!data) { | |
826 | err = -ENOMEM; | |
827 | goto exit; | |
828 | } | |
829 | i2c_set_clientdata(new_client, data); | |
9a61bf63 | 830 | mutex_init(&data->update_lock); |
1da177e4 | 831 | |
9b0e8526 JD |
832 | /* Set the device type */ |
833 | data->kind = id->driver_data; | |
834 | if (data->kind == adm1032) { | |
835 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE)) | |
836 | new_client->flags &= ~I2C_CLIENT_PEC; | |
837 | } | |
1da177e4 LT |
838 | |
839 | /* Initialize the LM90 chip */ | |
840 | lm90_init_client(new_client); | |
841 | ||
842 | /* Register sysfs hooks */ | |
0e39e01c | 843 | if ((err = sysfs_create_group(&new_client->dev.kobj, &lm90_group))) |
9b0e8526 | 844 | goto exit_free; |
0e39e01c JD |
845 | if (new_client->flags & I2C_CLIENT_PEC) { |
846 | if ((err = device_create_file(&new_client->dev, | |
847 | &dev_attr_pec))) | |
848 | goto exit_remove_files; | |
849 | } | |
271dabf5 | 850 | if (data->kind != max6657 && data->kind != max6646) { |
69f2f96d JD |
851 | if ((err = device_create_file(&new_client->dev, |
852 | &sensor_dev_attr_temp2_offset.dev_attr))) | |
853 | goto exit_remove_files; | |
854 | } | |
0e39e01c | 855 | |
1beeffe4 TJ |
856 | data->hwmon_dev = hwmon_device_register(&new_client->dev); |
857 | if (IS_ERR(data->hwmon_dev)) { | |
858 | err = PTR_ERR(data->hwmon_dev); | |
0e39e01c | 859 | goto exit_remove_files; |
943b0830 MH |
860 | } |
861 | ||
1da177e4 LT |
862 | return 0; |
863 | ||
0e39e01c JD |
864 | exit_remove_files: |
865 | sysfs_remove_group(&new_client->dev.kobj, &lm90_group); | |
866 | device_remove_file(&new_client->dev, &dev_attr_pec); | |
1da177e4 LT |
867 | exit_free: |
868 | kfree(data); | |
869 | exit: | |
870 | return err; | |
871 | } | |
872 | ||
873 | static void lm90_init_client(struct i2c_client *client) | |
874 | { | |
32c82a93 RB |
875 | u8 config, config_orig; |
876 | struct lm90_data *data = i2c_get_clientdata(client); | |
1da177e4 LT |
877 | |
878 | /* | |
879 | * Start the conversions. | |
880 | */ | |
881 | i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE, | |
882 | 5); /* 2 Hz */ | |
8256fe0f JD |
883 | if (lm90_read_reg(client, LM90_REG_R_CONFIG1, &config) < 0) { |
884 | dev_warn(&client->dev, "Initialization failed!\n"); | |
885 | return; | |
886 | } | |
32c82a93 RB |
887 | config_orig = config; |
888 | ||
23b2d477 NC |
889 | /* Check Temperature Range Select */ |
890 | if (data->kind == adt7461) { | |
891 | if (config & 0x04) | |
892 | data->flags |= LM90_FLAG_ADT7461_EXT; | |
893 | } | |
894 | ||
32c82a93 RB |
895 | /* |
896 | * Put MAX6680/MAX8881 into extended resolution (bit 0x10, | |
897 | * 0.125 degree resolution) and range (0x08, extend range | |
898 | * to -64 degree) mode for the remote temperature sensor. | |
899 | */ | |
900 | if (data->kind == max6680) { | |
901 | config |= 0x18; | |
902 | } | |
903 | ||
904 | config &= 0xBF; /* run */ | |
905 | if (config != config_orig) /* Only write if changed */ | |
906 | i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, config); | |
1da177e4 LT |
907 | } |
908 | ||
9b0e8526 | 909 | static int lm90_remove(struct i2c_client *client) |
1da177e4 | 910 | { |
943b0830 | 911 | struct lm90_data *data = i2c_get_clientdata(client); |
1da177e4 | 912 | |
1beeffe4 | 913 | hwmon_device_unregister(data->hwmon_dev); |
0e39e01c JD |
914 | sysfs_remove_group(&client->dev.kobj, &lm90_group); |
915 | device_remove_file(&client->dev, &dev_attr_pec); | |
271dabf5 | 916 | if (data->kind != max6657 && data->kind != max6646) |
69f2f96d JD |
917 | device_remove_file(&client->dev, |
918 | &sensor_dev_attr_temp2_offset.dev_attr); | |
943b0830 | 919 | |
943b0830 | 920 | kfree(data); |
1da177e4 LT |
921 | return 0; |
922 | } | |
923 | ||
6388a388 JD |
924 | static int lm90_read16(struct i2c_client *client, u8 regh, u8 regl, u16 *value) |
925 | { | |
926 | int err; | |
927 | u8 oldh, newh, l; | |
928 | ||
929 | /* | |
930 | * There is a trick here. We have to read two registers to have the | |
931 | * sensor temperature, but we have to beware a conversion could occur | |
932 | * inbetween the readings. The datasheet says we should either use | |
933 | * the one-shot conversion register, which we don't want to do | |
934 | * (disables hardware monitoring) or monitor the busy bit, which is | |
935 | * impossible (we can't read the values and monitor that bit at the | |
936 | * exact same time). So the solution used here is to read the high | |
937 | * byte once, then the low byte, then the high byte again. If the new | |
938 | * high byte matches the old one, then we have a valid reading. Else | |
939 | * we have to read the low byte again, and now we believe we have a | |
940 | * correct reading. | |
941 | */ | |
942 | if ((err = lm90_read_reg(client, regh, &oldh)) | |
943 | || (err = lm90_read_reg(client, regl, &l)) | |
944 | || (err = lm90_read_reg(client, regh, &newh))) | |
945 | return err; | |
946 | if (oldh != newh) { | |
947 | err = lm90_read_reg(client, regl, &l); | |
948 | if (err) | |
949 | return err; | |
950 | } | |
951 | *value = (newh << 8) | l; | |
952 | ||
953 | return 0; | |
954 | } | |
955 | ||
1da177e4 LT |
956 | static struct lm90_data *lm90_update_device(struct device *dev) |
957 | { | |
958 | struct i2c_client *client = to_i2c_client(dev); | |
959 | struct lm90_data *data = i2c_get_clientdata(client); | |
960 | ||
9a61bf63 | 961 | mutex_lock(&data->update_lock); |
1da177e4 LT |
962 | |
963 | if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) { | |
6388a388 | 964 | u8 h, l; |
1da177e4 LT |
965 | |
966 | dev_dbg(&client->dev, "Updating lm90 data.\n"); | |
f65e1708 JD |
967 | lm90_read_reg(client, LM90_REG_R_LOCAL_LOW, &data->temp8[0]); |
968 | lm90_read_reg(client, LM90_REG_R_LOCAL_HIGH, &data->temp8[1]); | |
969 | lm90_read_reg(client, LM90_REG_R_LOCAL_CRIT, &data->temp8[2]); | |
970 | lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT, &data->temp8[3]); | |
8256fe0f | 971 | lm90_read_reg(client, LM90_REG_R_TCRIT_HYST, &data->temp_hyst); |
1da177e4 | 972 | |
271dabf5 | 973 | if (data->kind == max6657 || data->kind == max6646) { |
f65e1708 JD |
974 | lm90_read16(client, LM90_REG_R_LOCAL_TEMP, |
975 | MAX6657_REG_R_LOCAL_TEMPL, | |
976 | &data->temp11[4]); | |
977 | } else { | |
978 | if (lm90_read_reg(client, LM90_REG_R_LOCAL_TEMP, | |
979 | &h) == 0) | |
980 | data->temp11[4] = h << 8; | |
981 | } | |
6388a388 JD |
982 | lm90_read16(client, LM90_REG_R_REMOTE_TEMPH, |
983 | LM90_REG_R_REMOTE_TEMPL, &data->temp11[0]); | |
984 | ||
5f502a83 JD |
985 | if (lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &h) == 0) { |
986 | data->temp11[1] = h << 8; | |
987 | if (data->kind != max6657 && data->kind != max6680 | |
271dabf5 | 988 | && data->kind != max6646 |
5f502a83 JD |
989 | && lm90_read_reg(client, LM90_REG_R_REMOTE_LOWL, |
990 | &l) == 0) | |
991 | data->temp11[1] |= l; | |
992 | } | |
993 | if (lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &h) == 0) { | |
994 | data->temp11[2] = h << 8; | |
995 | if (data->kind != max6657 && data->kind != max6680 | |
271dabf5 | 996 | && data->kind != max6646 |
5f502a83 JD |
997 | && lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHL, |
998 | &l) == 0) | |
999 | data->temp11[2] |= l; | |
1000 | } | |
1001 | ||
271dabf5 | 1002 | if (data->kind != max6657 && data->kind != max6646) { |
69f2f96d | 1003 | if (lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSH, |
6388a388 | 1004 | &h) == 0 |
69f2f96d JD |
1005 | && lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSL, |
1006 | &l) == 0) | |
6388a388 | 1007 | data->temp11[3] = (h << 8) | l; |
69f2f96d | 1008 | } |
8256fe0f | 1009 | lm90_read_reg(client, LM90_REG_R_STATUS, &data->alarms); |
1da177e4 LT |
1010 | |
1011 | data->last_updated = jiffies; | |
1012 | data->valid = 1; | |
1013 | } | |
1014 | ||
9a61bf63 | 1015 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
1016 | |
1017 | return data; | |
1018 | } | |
1019 | ||
1020 | static int __init sensors_lm90_init(void) | |
1021 | { | |
1022 | return i2c_add_driver(&lm90_driver); | |
1023 | } | |
1024 | ||
1025 | static void __exit sensors_lm90_exit(void) | |
1026 | { | |
1027 | i2c_del_driver(&lm90_driver); | |
1028 | } | |
1029 | ||
1030 | MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>"); | |
1031 | MODULE_DESCRIPTION("LM90/ADM1032 driver"); | |
1032 | MODULE_LICENSE("GPL"); | |
1033 | ||
1034 | module_init(sensors_lm90_init); | |
1035 | module_exit(sensors_lm90_exit); |