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1da177e4 LT |
1 | /* |
2 | * lm90.c - Part of lm_sensors, Linux kernel modules for hardware | |
3 | * monitoring | |
2d45771e | 4 | * Copyright (C) 2003-2006 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 LT |
43 | * variants. The extra address and features of the MAX6659 are not |
44 | * supported by this driver. | |
45 | * | |
46 | * This driver also supports the ADT7461 chip from Analog Devices but | |
47 | * only in its "compatability mode". If an ADT7461 chip is found but | |
48 | * is configured in non-compatible mode (where its temperature | |
49 | * register values are decoded differently) it is ignored by this | |
50 | * driver. Complete datasheet can be obtained from Analog's website | |
51 | * at: | |
90209b42 | 52 | * http://www.analog.com/en/prod/0,2877,ADT7461,00.html |
1da177e4 LT |
53 | * |
54 | * Since the LM90 was the first chipset supported by this driver, most | |
55 | * comments will refer to this chipset, but are actually general and | |
56 | * concern all supported chipsets, unless mentioned otherwise. | |
57 | * | |
58 | * This program is free software; you can redistribute it and/or modify | |
59 | * it under the terms of the GNU General Public License as published by | |
60 | * the Free Software Foundation; either version 2 of the License, or | |
61 | * (at your option) any later version. | |
62 | * | |
63 | * This program is distributed in the hope that it will be useful, | |
64 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
65 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
66 | * GNU General Public License for more details. | |
67 | * | |
68 | * You should have received a copy of the GNU General Public License | |
69 | * along with this program; if not, write to the Free Software | |
70 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
71 | */ | |
72 | ||
1da177e4 LT |
73 | #include <linux/module.h> |
74 | #include <linux/init.h> | |
75 | #include <linux/slab.h> | |
76 | #include <linux/jiffies.h> | |
77 | #include <linux/i2c.h> | |
10c08f81 | 78 | #include <linux/hwmon-sysfs.h> |
943b0830 MH |
79 | #include <linux/hwmon.h> |
80 | #include <linux/err.h> | |
9a61bf63 | 81 | #include <linux/mutex.h> |
0e39e01c | 82 | #include <linux/sysfs.h> |
1da177e4 LT |
83 | |
84 | /* | |
85 | * Addresses to scan | |
86 | * Address is fully defined internally and cannot be changed except for | |
87 | * MAX6659. | |
90209b42 JD |
88 | * LM86, LM89, LM90, LM99, ADM1032, ADM1032-1, ADT7461, MAX6657 and MAX6658 |
89 | * have address 0x4c. | |
90 | * ADM1032-2, ADT7461-2, LM89-1, and LM99-1 have address 0x4d. | |
1da177e4 | 91 | * MAX6659 can have address 0x4c, 0x4d or 0x4e (unsupported). |
1da177e4 LT |
92 | */ |
93 | ||
94 | static unsigned short normal_i2c[] = { 0x4c, 0x4d, I2C_CLIENT_END }; | |
1da177e4 LT |
95 | |
96 | /* | |
97 | * Insmod parameters | |
98 | */ | |
99 | ||
f4b50261 | 100 | I2C_CLIENT_INSMOD_6(lm90, adm1032, lm99, lm86, max6657, adt7461); |
1da177e4 LT |
101 | |
102 | /* | |
103 | * The LM90 registers | |
104 | */ | |
105 | ||
106 | #define LM90_REG_R_MAN_ID 0xFE | |
107 | #define LM90_REG_R_CHIP_ID 0xFF | |
108 | #define LM90_REG_R_CONFIG1 0x03 | |
109 | #define LM90_REG_W_CONFIG1 0x09 | |
110 | #define LM90_REG_R_CONFIG2 0xBF | |
111 | #define LM90_REG_W_CONFIG2 0xBF | |
112 | #define LM90_REG_R_CONVRATE 0x04 | |
113 | #define LM90_REG_W_CONVRATE 0x0A | |
114 | #define LM90_REG_R_STATUS 0x02 | |
115 | #define LM90_REG_R_LOCAL_TEMP 0x00 | |
116 | #define LM90_REG_R_LOCAL_HIGH 0x05 | |
117 | #define LM90_REG_W_LOCAL_HIGH 0x0B | |
118 | #define LM90_REG_R_LOCAL_LOW 0x06 | |
119 | #define LM90_REG_W_LOCAL_LOW 0x0C | |
120 | #define LM90_REG_R_LOCAL_CRIT 0x20 | |
121 | #define LM90_REG_W_LOCAL_CRIT 0x20 | |
122 | #define LM90_REG_R_REMOTE_TEMPH 0x01 | |
123 | #define LM90_REG_R_REMOTE_TEMPL 0x10 | |
124 | #define LM90_REG_R_REMOTE_OFFSH 0x11 | |
125 | #define LM90_REG_W_REMOTE_OFFSH 0x11 | |
126 | #define LM90_REG_R_REMOTE_OFFSL 0x12 | |
127 | #define LM90_REG_W_REMOTE_OFFSL 0x12 | |
128 | #define LM90_REG_R_REMOTE_HIGHH 0x07 | |
129 | #define LM90_REG_W_REMOTE_HIGHH 0x0D | |
130 | #define LM90_REG_R_REMOTE_HIGHL 0x13 | |
131 | #define LM90_REG_W_REMOTE_HIGHL 0x13 | |
132 | #define LM90_REG_R_REMOTE_LOWH 0x08 | |
133 | #define LM90_REG_W_REMOTE_LOWH 0x0E | |
134 | #define LM90_REG_R_REMOTE_LOWL 0x14 | |
135 | #define LM90_REG_W_REMOTE_LOWL 0x14 | |
136 | #define LM90_REG_R_REMOTE_CRIT 0x19 | |
137 | #define LM90_REG_W_REMOTE_CRIT 0x19 | |
138 | #define LM90_REG_R_TCRIT_HYST 0x21 | |
139 | #define LM90_REG_W_TCRIT_HYST 0x21 | |
140 | ||
141 | /* | |
142 | * Conversions and various macros | |
143 | * For local temperatures and limits, critical limits and the hysteresis | |
44bbe87e | 144 | * value, the LM90 uses signed 8-bit values with LSB = 1 degree Celsius. |
1da177e4 | 145 | * For remote temperatures and limits, it uses signed 11-bit values with |
44bbe87e | 146 | * LSB = 0.125 degree Celsius, left-justified in 16-bit registers. |
1da177e4 LT |
147 | */ |
148 | ||
149 | #define TEMP1_FROM_REG(val) ((val) * 1000) | |
150 | #define TEMP1_TO_REG(val) ((val) <= -128000 ? -128 : \ | |
151 | (val) >= 127000 ? 127 : \ | |
152 | (val) < 0 ? ((val) - 500) / 1000 : \ | |
153 | ((val) + 500) / 1000) | |
154 | #define TEMP2_FROM_REG(val) ((val) / 32 * 125) | |
155 | #define TEMP2_TO_REG(val) ((val) <= -128000 ? 0x8000 : \ | |
156 | (val) >= 127875 ? 0x7FE0 : \ | |
157 | (val) < 0 ? ((val) - 62) / 125 * 32 : \ | |
158 | ((val) + 62) / 125 * 32) | |
159 | #define HYST_TO_REG(val) ((val) <= 0 ? 0 : (val) >= 30500 ? 31 : \ | |
160 | ((val) + 500) / 1000) | |
161 | ||
162 | /* | |
163 | * ADT7461 is almost identical to LM90 except that attempts to write | |
164 | * values that are outside the range 0 < temp < 127 are treated as | |
165 | * the boundary value. | |
166 | */ | |
167 | ||
168 | #define TEMP1_TO_REG_ADT7461(val) ((val) <= 0 ? 0 : \ | |
169 | (val) >= 127000 ? 127 : \ | |
170 | ((val) + 500) / 1000) | |
171 | #define TEMP2_TO_REG_ADT7461(val) ((val) <= 0 ? 0 : \ | |
172 | (val) >= 127750 ? 0x7FC0 : \ | |
173 | ((val) + 125) / 250 * 64) | |
174 | ||
175 | /* | |
176 | * Functions declaration | |
177 | */ | |
178 | ||
179 | static int lm90_attach_adapter(struct i2c_adapter *adapter); | |
180 | static int lm90_detect(struct i2c_adapter *adapter, int address, | |
181 | int kind); | |
182 | static void lm90_init_client(struct i2c_client *client); | |
183 | static int lm90_detach_client(struct i2c_client *client); | |
184 | static struct lm90_data *lm90_update_device(struct device *dev); | |
185 | ||
186 | /* | |
187 | * Driver data (common to all clients) | |
188 | */ | |
189 | ||
190 | static struct i2c_driver lm90_driver = { | |
cdaf7934 | 191 | .driver = { |
cdaf7934 LR |
192 | .name = "lm90", |
193 | }, | |
1da177e4 | 194 | .id = I2C_DRIVERID_LM90, |
1da177e4 LT |
195 | .attach_adapter = lm90_attach_adapter, |
196 | .detach_client = lm90_detach_client, | |
197 | }; | |
198 | ||
199 | /* | |
200 | * Client data (each client gets its own) | |
201 | */ | |
202 | ||
203 | struct lm90_data { | |
204 | struct i2c_client client; | |
943b0830 | 205 | struct class_device *class_dev; |
9a61bf63 | 206 | struct mutex update_lock; |
1da177e4 LT |
207 | char valid; /* zero until following fields are valid */ |
208 | unsigned long last_updated; /* in jiffies */ | |
209 | int kind; | |
210 | ||
211 | /* registers values */ | |
30d7394b JD |
212 | s8 temp8[5]; /* 0: local input |
213 | 1: local low limit | |
214 | 2: local high limit | |
215 | 3: local critical limit | |
216 | 4: remote critical limit */ | |
217 | s16 temp11[3]; /* 0: remote input | |
218 | 1: remote low limit | |
219 | 2: remote high limit */ | |
1da177e4 LT |
220 | u8 temp_hyst; |
221 | u8 alarms; /* bitvector */ | |
222 | }; | |
223 | ||
224 | /* | |
225 | * Sysfs stuff | |
226 | */ | |
227 | ||
30d7394b JD |
228 | static ssize_t show_temp8(struct device *dev, struct device_attribute *devattr, |
229 | char *buf) | |
230 | { | |
231 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
232 | struct lm90_data *data = lm90_update_device(dev); | |
233 | return sprintf(buf, "%d\n", TEMP1_FROM_REG(data->temp8[attr->index])); | |
234 | } | |
235 | ||
236 | static ssize_t set_temp8(struct device *dev, struct device_attribute *devattr, | |
237 | const char *buf, size_t count) | |
238 | { | |
239 | static const u8 reg[4] = { | |
240 | LM90_REG_W_LOCAL_LOW, | |
241 | LM90_REG_W_LOCAL_HIGH, | |
242 | LM90_REG_W_LOCAL_CRIT, | |
243 | LM90_REG_W_REMOTE_CRIT, | |
244 | }; | |
245 | ||
246 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
247 | struct i2c_client *client = to_i2c_client(dev); | |
248 | struct lm90_data *data = i2c_get_clientdata(client); | |
249 | long val = simple_strtol(buf, NULL, 10); | |
250 | int nr = attr->index; | |
251 | ||
9a61bf63 | 252 | mutex_lock(&data->update_lock); |
30d7394b JD |
253 | if (data->kind == adt7461) |
254 | data->temp8[nr] = TEMP1_TO_REG_ADT7461(val); | |
255 | else | |
256 | data->temp8[nr] = TEMP1_TO_REG(val); | |
257 | i2c_smbus_write_byte_data(client, reg[nr - 1], data->temp8[nr]); | |
9a61bf63 | 258 | mutex_unlock(&data->update_lock); |
30d7394b | 259 | return count; |
1da177e4 | 260 | } |
30d7394b JD |
261 | |
262 | static ssize_t show_temp11(struct device *dev, struct device_attribute *devattr, | |
263 | char *buf) | |
264 | { | |
265 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
266 | struct lm90_data *data = lm90_update_device(dev); | |
267 | return sprintf(buf, "%d\n", TEMP2_FROM_REG(data->temp11[attr->index])); | |
1da177e4 | 268 | } |
30d7394b JD |
269 | |
270 | static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr, | |
271 | const char *buf, size_t count) | |
272 | { | |
273 | static const u8 reg[4] = { | |
274 | LM90_REG_W_REMOTE_LOWH, | |
275 | LM90_REG_W_REMOTE_LOWL, | |
276 | LM90_REG_W_REMOTE_HIGHH, | |
277 | LM90_REG_W_REMOTE_HIGHL, | |
278 | }; | |
279 | ||
280 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
281 | struct i2c_client *client = to_i2c_client(dev); | |
282 | struct lm90_data *data = i2c_get_clientdata(client); | |
283 | long val = simple_strtol(buf, NULL, 10); | |
284 | int nr = attr->index; | |
285 | ||
9a61bf63 | 286 | mutex_lock(&data->update_lock); |
30d7394b JD |
287 | if (data->kind == adt7461) |
288 | data->temp11[nr] = TEMP2_TO_REG_ADT7461(val); | |
289 | else | |
290 | data->temp11[nr] = TEMP2_TO_REG(val); | |
291 | i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2], | |
292 | data->temp11[nr] >> 8); | |
293 | i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2 + 1], | |
294 | data->temp11[nr] & 0xff); | |
9a61bf63 | 295 | mutex_unlock(&data->update_lock); |
30d7394b | 296 | return count; |
1da177e4 | 297 | } |
30d7394b JD |
298 | |
299 | static ssize_t show_temphyst(struct device *dev, struct device_attribute *devattr, | |
300 | char *buf) | |
301 | { | |
302 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
303 | struct lm90_data *data = lm90_update_device(dev); | |
304 | return sprintf(buf, "%d\n", TEMP1_FROM_REG(data->temp8[attr->index]) | |
305 | - TEMP1_FROM_REG(data->temp_hyst)); | |
1da177e4 | 306 | } |
1da177e4 | 307 | |
30d7394b JD |
308 | static ssize_t set_temphyst(struct device *dev, struct device_attribute *dummy, |
309 | const char *buf, size_t count) | |
1da177e4 LT |
310 | { |
311 | struct i2c_client *client = to_i2c_client(dev); | |
312 | struct lm90_data *data = i2c_get_clientdata(client); | |
313 | long val = simple_strtol(buf, NULL, 10); | |
314 | long hyst; | |
315 | ||
9a61bf63 | 316 | mutex_lock(&data->update_lock); |
30d7394b | 317 | hyst = TEMP1_FROM_REG(data->temp8[3]) - val; |
1da177e4 LT |
318 | i2c_smbus_write_byte_data(client, LM90_REG_W_TCRIT_HYST, |
319 | HYST_TO_REG(hyst)); | |
9a61bf63 | 320 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
321 | return count; |
322 | } | |
323 | ||
30d7394b JD |
324 | static ssize_t show_alarms(struct device *dev, struct device_attribute *dummy, |
325 | char *buf) | |
1da177e4 LT |
326 | { |
327 | struct lm90_data *data = lm90_update_device(dev); | |
328 | return sprintf(buf, "%d\n", data->alarms); | |
329 | } | |
330 | ||
2d45771e JD |
331 | static ssize_t show_alarm(struct device *dev, struct device_attribute |
332 | *devattr, char *buf) | |
333 | { | |
334 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
335 | struct lm90_data *data = lm90_update_device(dev); | |
336 | int bitnr = attr->index; | |
337 | ||
338 | return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1); | |
339 | } | |
340 | ||
30d7394b JD |
341 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp8, NULL, 0); |
342 | static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp11, NULL, 0); | |
343 | static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp8, | |
344 | set_temp8, 1); | |
345 | static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp11, | |
346 | set_temp11, 1); | |
347 | static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp8, | |
348 | set_temp8, 2); | |
349 | static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp11, | |
350 | set_temp11, 2); | |
351 | static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp8, | |
352 | set_temp8, 3); | |
353 | static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp8, | |
354 | set_temp8, 4); | |
355 | static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temphyst, | |
356 | set_temphyst, 3); | |
357 | static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temphyst, NULL, 4); | |
2d45771e JD |
358 | |
359 | /* Individual alarm files */ | |
360 | static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 0); | |
361 | static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1); | |
362 | static SENSOR_DEVICE_ATTR(temp2_input_fault, S_IRUGO, show_alarm, NULL, 2); | |
363 | static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3); | |
364 | static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4); | |
365 | static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 5); | |
366 | static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6); | |
367 | /* Raw alarm file for compatibility */ | |
1da177e4 LT |
368 | static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); |
369 | ||
0e39e01c JD |
370 | static struct attribute *lm90_attributes[] = { |
371 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
372 | &sensor_dev_attr_temp2_input.dev_attr.attr, | |
373 | &sensor_dev_attr_temp1_min.dev_attr.attr, | |
374 | &sensor_dev_attr_temp2_min.dev_attr.attr, | |
375 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
376 | &sensor_dev_attr_temp2_max.dev_attr.attr, | |
377 | &sensor_dev_attr_temp1_crit.dev_attr.attr, | |
378 | &sensor_dev_attr_temp2_crit.dev_attr.attr, | |
379 | &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr, | |
380 | &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr, | |
381 | ||
382 | &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, | |
383 | &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr, | |
384 | &sensor_dev_attr_temp2_input_fault.dev_attr.attr, | |
385 | &sensor_dev_attr_temp2_min_alarm.dev_attr.attr, | |
386 | &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, | |
387 | &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, | |
388 | &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, | |
389 | &dev_attr_alarms.attr, | |
390 | NULL | |
391 | }; | |
392 | ||
393 | static const struct attribute_group lm90_group = { | |
394 | .attrs = lm90_attributes, | |
395 | }; | |
396 | ||
c3df5806 JD |
397 | /* pec used for ADM1032 only */ |
398 | static ssize_t show_pec(struct device *dev, struct device_attribute *dummy, | |
399 | char *buf) | |
400 | { | |
401 | struct i2c_client *client = to_i2c_client(dev); | |
402 | return sprintf(buf, "%d\n", !!(client->flags & I2C_CLIENT_PEC)); | |
403 | } | |
404 | ||
405 | static ssize_t set_pec(struct device *dev, struct device_attribute *dummy, | |
406 | const char *buf, size_t count) | |
407 | { | |
408 | struct i2c_client *client = to_i2c_client(dev); | |
409 | long val = simple_strtol(buf, NULL, 10); | |
410 | ||
411 | switch (val) { | |
412 | case 0: | |
413 | client->flags &= ~I2C_CLIENT_PEC; | |
414 | break; | |
415 | case 1: | |
416 | client->flags |= I2C_CLIENT_PEC; | |
417 | break; | |
418 | default: | |
419 | return -EINVAL; | |
420 | } | |
421 | ||
422 | return count; | |
423 | } | |
424 | ||
425 | static DEVICE_ATTR(pec, S_IWUSR | S_IRUGO, show_pec, set_pec); | |
426 | ||
1da177e4 LT |
427 | /* |
428 | * Real code | |
429 | */ | |
430 | ||
c3df5806 JD |
431 | /* The ADM1032 supports PEC but not on write byte transactions, so we need |
432 | to explicitely ask for a transaction without PEC. */ | |
433 | static inline s32 adm1032_write_byte(struct i2c_client *client, u8 value) | |
434 | { | |
435 | return i2c_smbus_xfer(client->adapter, client->addr, | |
436 | client->flags & ~I2C_CLIENT_PEC, | |
437 | I2C_SMBUS_WRITE, value, I2C_SMBUS_BYTE, NULL); | |
438 | } | |
439 | ||
440 | /* It is assumed that client->update_lock is held (unless we are in | |
441 | detection or initialization steps). This matters when PEC is enabled, | |
442 | because we don't want the address pointer to change between the write | |
443 | byte and the read byte transactions. */ | |
8256fe0f JD |
444 | static int lm90_read_reg(struct i2c_client* client, u8 reg, u8 *value) |
445 | { | |
446 | int err; | |
447 | ||
c3df5806 JD |
448 | if (client->flags & I2C_CLIENT_PEC) { |
449 | err = adm1032_write_byte(client, reg); | |
450 | if (err >= 0) | |
451 | err = i2c_smbus_read_byte(client); | |
452 | } else | |
453 | err = i2c_smbus_read_byte_data(client, reg); | |
8256fe0f JD |
454 | |
455 | if (err < 0) { | |
456 | dev_warn(&client->dev, "Register %#02x read failed (%d)\n", | |
457 | reg, err); | |
458 | return err; | |
459 | } | |
460 | *value = err; | |
461 | ||
462 | return 0; | |
463 | } | |
464 | ||
1da177e4 LT |
465 | static int lm90_attach_adapter(struct i2c_adapter *adapter) |
466 | { | |
467 | if (!(adapter->class & I2C_CLASS_HWMON)) | |
468 | return 0; | |
2ed2dc3c | 469 | return i2c_probe(adapter, &addr_data, lm90_detect); |
1da177e4 LT |
470 | } |
471 | ||
472 | /* | |
473 | * The following function does more than just detection. If detection | |
474 | * succeeds, it also registers the new chip. | |
475 | */ | |
476 | static int lm90_detect(struct i2c_adapter *adapter, int address, int kind) | |
477 | { | |
478 | struct i2c_client *new_client; | |
479 | struct lm90_data *data; | |
480 | int err = 0; | |
481 | const char *name = ""; | |
482 | ||
483 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
484 | goto exit; | |
485 | ||
ba9c2e8d | 486 | if (!(data = kzalloc(sizeof(struct lm90_data), GFP_KERNEL))) { |
1da177e4 LT |
487 | err = -ENOMEM; |
488 | goto exit; | |
489 | } | |
1da177e4 LT |
490 | |
491 | /* The common I2C client data is placed right before the | |
492 | LM90-specific data. */ | |
493 | new_client = &data->client; | |
494 | i2c_set_clientdata(new_client, data); | |
495 | new_client->addr = address; | |
496 | new_client->adapter = adapter; | |
497 | new_client->driver = &lm90_driver; | |
498 | new_client->flags = 0; | |
499 | ||
500 | /* | |
501 | * Now we do the remaining detection. A negative kind means that | |
502 | * the driver was loaded with no force parameter (default), so we | |
503 | * must both detect and identify the chip. A zero kind means that | |
504 | * the driver was loaded with the force parameter, the detection | |
505 | * step shall be skipped. A positive kind means that the driver | |
506 | * was loaded with the force parameter and a given kind of chip is | |
507 | * requested, so both the detection and the identification steps | |
508 | * are skipped. | |
509 | */ | |
510 | ||
511 | /* Default to an LM90 if forced */ | |
512 | if (kind == 0) | |
513 | kind = lm90; | |
514 | ||
515 | if (kind < 0) { /* detection and identification */ | |
516 | u8 man_id, chip_id, reg_config1, reg_convrate; | |
517 | ||
8256fe0f JD |
518 | if (lm90_read_reg(new_client, LM90_REG_R_MAN_ID, |
519 | &man_id) < 0 | |
520 | || lm90_read_reg(new_client, LM90_REG_R_CHIP_ID, | |
521 | &chip_id) < 0 | |
522 | || lm90_read_reg(new_client, LM90_REG_R_CONFIG1, | |
523 | ®_config1) < 0 | |
524 | || lm90_read_reg(new_client, LM90_REG_R_CONVRATE, | |
525 | ®_convrate) < 0) | |
526 | goto exit_free; | |
1da177e4 LT |
527 | |
528 | if (man_id == 0x01) { /* National Semiconductor */ | |
529 | u8 reg_config2; | |
530 | ||
8256fe0f JD |
531 | if (lm90_read_reg(new_client, LM90_REG_R_CONFIG2, |
532 | ®_config2) < 0) | |
533 | goto exit_free; | |
1da177e4 LT |
534 | |
535 | if ((reg_config1 & 0x2A) == 0x00 | |
536 | && (reg_config2 & 0xF8) == 0x00 | |
537 | && reg_convrate <= 0x09) { | |
538 | if (address == 0x4C | |
539 | && (chip_id & 0xF0) == 0x20) { /* LM90 */ | |
540 | kind = lm90; | |
541 | } else | |
542 | if ((chip_id & 0xF0) == 0x30) { /* LM89/LM99 */ | |
543 | kind = lm99; | |
544 | } else | |
545 | if (address == 0x4C | |
546 | && (chip_id & 0xF0) == 0x10) { /* LM86 */ | |
547 | kind = lm86; | |
548 | } | |
549 | } | |
550 | } else | |
551 | if (man_id == 0x41) { /* Analog Devices */ | |
90209b42 | 552 | if ((chip_id & 0xF0) == 0x40 /* ADM1032 */ |
1da177e4 LT |
553 | && (reg_config1 & 0x3F) == 0x00 |
554 | && reg_convrate <= 0x0A) { | |
555 | kind = adm1032; | |
556 | } else | |
90209b42 | 557 | if (chip_id == 0x51 /* ADT7461 */ |
1da177e4 LT |
558 | && (reg_config1 & 0x1F) == 0x00 /* check compat mode */ |
559 | && reg_convrate <= 0x0A) { | |
560 | kind = adt7461; | |
561 | } | |
562 | } else | |
563 | if (man_id == 0x4D) { /* Maxim */ | |
564 | /* | |
565 | * The Maxim variants do NOT have a chip_id register. | |
566 | * Reading from that address will return the last read | |
567 | * value, which in our case is those of the man_id | |
568 | * register. Likewise, the config1 register seems to | |
569 | * lack a low nibble, so the value will be those of the | |
570 | * previous read, so in our case those of the man_id | |
571 | * register. | |
572 | */ | |
573 | if (chip_id == man_id | |
574 | && (reg_config1 & 0x1F) == (man_id & 0x0F) | |
575 | && reg_convrate <= 0x09) { | |
576 | kind = max6657; | |
577 | } | |
578 | } | |
579 | ||
580 | if (kind <= 0) { /* identification failed */ | |
581 | dev_info(&adapter->dev, | |
582 | "Unsupported chip (man_id=0x%02X, " | |
583 | "chip_id=0x%02X).\n", man_id, chip_id); | |
584 | goto exit_free; | |
585 | } | |
586 | } | |
587 | ||
588 | if (kind == lm90) { | |
589 | name = "lm90"; | |
590 | } else if (kind == adm1032) { | |
591 | name = "adm1032"; | |
c3df5806 JD |
592 | /* The ADM1032 supports PEC, but only if combined |
593 | transactions are not used. */ | |
594 | if (i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE)) | |
595 | new_client->flags |= I2C_CLIENT_PEC; | |
1da177e4 LT |
596 | } else if (kind == lm99) { |
597 | name = "lm99"; | |
598 | } else if (kind == lm86) { | |
599 | name = "lm86"; | |
600 | } else if (kind == max6657) { | |
601 | name = "max6657"; | |
602 | } else if (kind == adt7461) { | |
603 | name = "adt7461"; | |
604 | } | |
605 | ||
606 | /* We can fill in the remaining client fields */ | |
607 | strlcpy(new_client->name, name, I2C_NAME_SIZE); | |
608 | data->valid = 0; | |
609 | data->kind = kind; | |
9a61bf63 | 610 | mutex_init(&data->update_lock); |
1da177e4 LT |
611 | |
612 | /* Tell the I2C layer a new client has arrived */ | |
613 | if ((err = i2c_attach_client(new_client))) | |
614 | goto exit_free; | |
615 | ||
616 | /* Initialize the LM90 chip */ | |
617 | lm90_init_client(new_client); | |
618 | ||
619 | /* Register sysfs hooks */ | |
0e39e01c JD |
620 | if ((err = sysfs_create_group(&new_client->dev.kobj, &lm90_group))) |
621 | goto exit_detach; | |
622 | if (new_client->flags & I2C_CLIENT_PEC) { | |
623 | if ((err = device_create_file(&new_client->dev, | |
624 | &dev_attr_pec))) | |
625 | goto exit_remove_files; | |
626 | } | |
627 | ||
943b0830 MH |
628 | data->class_dev = hwmon_device_register(&new_client->dev); |
629 | if (IS_ERR(data->class_dev)) { | |
630 | err = PTR_ERR(data->class_dev); | |
0e39e01c | 631 | goto exit_remove_files; |
943b0830 MH |
632 | } |
633 | ||
1da177e4 LT |
634 | return 0; |
635 | ||
0e39e01c JD |
636 | exit_remove_files: |
637 | sysfs_remove_group(&new_client->dev.kobj, &lm90_group); | |
638 | device_remove_file(&new_client->dev, &dev_attr_pec); | |
943b0830 MH |
639 | exit_detach: |
640 | i2c_detach_client(new_client); | |
1da177e4 LT |
641 | exit_free: |
642 | kfree(data); | |
643 | exit: | |
644 | return err; | |
645 | } | |
646 | ||
647 | static void lm90_init_client(struct i2c_client *client) | |
648 | { | |
649 | u8 config; | |
650 | ||
651 | /* | |
652 | * Start the conversions. | |
653 | */ | |
654 | i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE, | |
655 | 5); /* 2 Hz */ | |
8256fe0f JD |
656 | if (lm90_read_reg(client, LM90_REG_R_CONFIG1, &config) < 0) { |
657 | dev_warn(&client->dev, "Initialization failed!\n"); | |
658 | return; | |
659 | } | |
1da177e4 LT |
660 | if (config & 0x40) |
661 | i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, | |
662 | config & 0xBF); /* run */ | |
663 | } | |
664 | ||
665 | static int lm90_detach_client(struct i2c_client *client) | |
666 | { | |
943b0830 | 667 | struct lm90_data *data = i2c_get_clientdata(client); |
1da177e4 LT |
668 | int err; |
669 | ||
943b0830 | 670 | hwmon_device_unregister(data->class_dev); |
0e39e01c JD |
671 | sysfs_remove_group(&client->dev.kobj, &lm90_group); |
672 | device_remove_file(&client->dev, &dev_attr_pec); | |
943b0830 | 673 | |
7bef5594 | 674 | if ((err = i2c_detach_client(client))) |
1da177e4 | 675 | return err; |
1da177e4 | 676 | |
943b0830 | 677 | kfree(data); |
1da177e4 LT |
678 | return 0; |
679 | } | |
680 | ||
681 | static struct lm90_data *lm90_update_device(struct device *dev) | |
682 | { | |
683 | struct i2c_client *client = to_i2c_client(dev); | |
684 | struct lm90_data *data = i2c_get_clientdata(client); | |
685 | ||
9a61bf63 | 686 | mutex_lock(&data->update_lock); |
1da177e4 LT |
687 | |
688 | if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) { | |
8256fe0f | 689 | u8 oldh, newh, l; |
1da177e4 LT |
690 | |
691 | dev_dbg(&client->dev, "Updating lm90 data.\n"); | |
8256fe0f JD |
692 | lm90_read_reg(client, LM90_REG_R_LOCAL_TEMP, &data->temp8[0]); |
693 | lm90_read_reg(client, LM90_REG_R_LOCAL_LOW, &data->temp8[1]); | |
694 | lm90_read_reg(client, LM90_REG_R_LOCAL_HIGH, &data->temp8[2]); | |
695 | lm90_read_reg(client, LM90_REG_R_LOCAL_CRIT, &data->temp8[3]); | |
696 | lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT, &data->temp8[4]); | |
697 | lm90_read_reg(client, LM90_REG_R_TCRIT_HYST, &data->temp_hyst); | |
1da177e4 LT |
698 | |
699 | /* | |
700 | * There is a trick here. We have to read two registers to | |
701 | * have the remote sensor temperature, but we have to beware | |
702 | * a conversion could occur inbetween the readings. The | |
703 | * datasheet says we should either use the one-shot | |
704 | * conversion register, which we don't want to do (disables | |
705 | * hardware monitoring) or monitor the busy bit, which is | |
706 | * impossible (we can't read the values and monitor that bit | |
707 | * at the exact same time). So the solution used here is to | |
708 | * read the high byte once, then the low byte, then the high | |
709 | * byte again. If the new high byte matches the old one, | |
710 | * then we have a valid reading. Else we have to read the low | |
711 | * byte again, and now we believe we have a correct reading. | |
712 | */ | |
8256fe0f JD |
713 | if (lm90_read_reg(client, LM90_REG_R_REMOTE_TEMPH, &oldh) == 0 |
714 | && lm90_read_reg(client, LM90_REG_R_REMOTE_TEMPL, &l) == 0 | |
715 | && lm90_read_reg(client, LM90_REG_R_REMOTE_TEMPH, &newh) == 0 | |
716 | && (newh == oldh | |
717 | || lm90_read_reg(client, LM90_REG_R_REMOTE_TEMPL, &l) == 0)) | |
718 | data->temp11[0] = (newh << 8) | l; | |
719 | ||
720 | if (lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &newh) == 0 | |
721 | && lm90_read_reg(client, LM90_REG_R_REMOTE_LOWL, &l) == 0) | |
722 | data->temp11[1] = (newh << 8) | l; | |
723 | if (lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &newh) == 0 | |
724 | && lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHL, &l) == 0) | |
725 | data->temp11[2] = (newh << 8) | l; | |
726 | lm90_read_reg(client, LM90_REG_R_STATUS, &data->alarms); | |
1da177e4 LT |
727 | |
728 | data->last_updated = jiffies; | |
729 | data->valid = 1; | |
730 | } | |
731 | ||
9a61bf63 | 732 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
733 | |
734 | return data; | |
735 | } | |
736 | ||
737 | static int __init sensors_lm90_init(void) | |
738 | { | |
739 | return i2c_add_driver(&lm90_driver); | |
740 | } | |
741 | ||
742 | static void __exit sensors_lm90_exit(void) | |
743 | { | |
744 | i2c_del_driver(&lm90_driver); | |
745 | } | |
746 | ||
747 | MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>"); | |
748 | MODULE_DESCRIPTION("LM90/ADM1032 driver"); | |
749 | MODULE_LICENSE("GPL"); | |
750 | ||
751 | module_init(sensors_lm90_init); | |
752 | module_exit(sensors_lm90_exit); |