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1da177e4 LT |
1 | /* |
2 | * lm90.c - Part of lm_sensors, Linux kernel modules for hardware | |
3 | * monitoring | |
4 | * Copyright (C) 2003-2004 Jean Delvare <khali@linux-fr.org> | |
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: | |
34 | * http://products.analog.com/products/info.asp?product=ADM1032 | |
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: | |
52 | * http://products.analog.com/products/info.asp?product=ADT7461 | |
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> | |
78 | #include <linux/i2c-sensor.h> | |
79 | ||
80 | /* | |
81 | * Addresses to scan | |
82 | * Address is fully defined internally and cannot be changed except for | |
83 | * MAX6659. | |
84 | * LM86, LM89, LM90, LM99, ADM1032, MAX6657 and MAX6658 have address 0x4c. | |
85 | * LM89-1, and LM99-1 have address 0x4d. | |
86 | * MAX6659 can have address 0x4c, 0x4d or 0x4e (unsupported). | |
87 | * ADT7461 always has address 0x4c. | |
88 | */ | |
89 | ||
90 | static unsigned short normal_i2c[] = { 0x4c, 0x4d, I2C_CLIENT_END }; | |
91 | static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END }; | |
92 | ||
93 | /* | |
94 | * Insmod parameters | |
95 | */ | |
96 | ||
97 | SENSORS_INSMOD_6(lm90, adm1032, lm99, lm86, max6657, adt7461); | |
98 | ||
99 | /* | |
100 | * The LM90 registers | |
101 | */ | |
102 | ||
103 | #define LM90_REG_R_MAN_ID 0xFE | |
104 | #define LM90_REG_R_CHIP_ID 0xFF | |
105 | #define LM90_REG_R_CONFIG1 0x03 | |
106 | #define LM90_REG_W_CONFIG1 0x09 | |
107 | #define LM90_REG_R_CONFIG2 0xBF | |
108 | #define LM90_REG_W_CONFIG2 0xBF | |
109 | #define LM90_REG_R_CONVRATE 0x04 | |
110 | #define LM90_REG_W_CONVRATE 0x0A | |
111 | #define LM90_REG_R_STATUS 0x02 | |
112 | #define LM90_REG_R_LOCAL_TEMP 0x00 | |
113 | #define LM90_REG_R_LOCAL_HIGH 0x05 | |
114 | #define LM90_REG_W_LOCAL_HIGH 0x0B | |
115 | #define LM90_REG_R_LOCAL_LOW 0x06 | |
116 | #define LM90_REG_W_LOCAL_LOW 0x0C | |
117 | #define LM90_REG_R_LOCAL_CRIT 0x20 | |
118 | #define LM90_REG_W_LOCAL_CRIT 0x20 | |
119 | #define LM90_REG_R_REMOTE_TEMPH 0x01 | |
120 | #define LM90_REG_R_REMOTE_TEMPL 0x10 | |
121 | #define LM90_REG_R_REMOTE_OFFSH 0x11 | |
122 | #define LM90_REG_W_REMOTE_OFFSH 0x11 | |
123 | #define LM90_REG_R_REMOTE_OFFSL 0x12 | |
124 | #define LM90_REG_W_REMOTE_OFFSL 0x12 | |
125 | #define LM90_REG_R_REMOTE_HIGHH 0x07 | |
126 | #define LM90_REG_W_REMOTE_HIGHH 0x0D | |
127 | #define LM90_REG_R_REMOTE_HIGHL 0x13 | |
128 | #define LM90_REG_W_REMOTE_HIGHL 0x13 | |
129 | #define LM90_REG_R_REMOTE_LOWH 0x08 | |
130 | #define LM90_REG_W_REMOTE_LOWH 0x0E | |
131 | #define LM90_REG_R_REMOTE_LOWL 0x14 | |
132 | #define LM90_REG_W_REMOTE_LOWL 0x14 | |
133 | #define LM90_REG_R_REMOTE_CRIT 0x19 | |
134 | #define LM90_REG_W_REMOTE_CRIT 0x19 | |
135 | #define LM90_REG_R_TCRIT_HYST 0x21 | |
136 | #define LM90_REG_W_TCRIT_HYST 0x21 | |
137 | ||
138 | /* | |
139 | * Conversions and various macros | |
140 | * For local temperatures and limits, critical limits and the hysteresis | |
44bbe87e | 141 | * value, the LM90 uses signed 8-bit values with LSB = 1 degree Celsius. |
1da177e4 | 142 | * For remote temperatures and limits, it uses signed 11-bit values with |
44bbe87e | 143 | * LSB = 0.125 degree Celsius, left-justified in 16-bit registers. |
1da177e4 LT |
144 | */ |
145 | ||
146 | #define TEMP1_FROM_REG(val) ((val) * 1000) | |
147 | #define TEMP1_TO_REG(val) ((val) <= -128000 ? -128 : \ | |
148 | (val) >= 127000 ? 127 : \ | |
149 | (val) < 0 ? ((val) - 500) / 1000 : \ | |
150 | ((val) + 500) / 1000) | |
151 | #define TEMP2_FROM_REG(val) ((val) / 32 * 125) | |
152 | #define TEMP2_TO_REG(val) ((val) <= -128000 ? 0x8000 : \ | |
153 | (val) >= 127875 ? 0x7FE0 : \ | |
154 | (val) < 0 ? ((val) - 62) / 125 * 32 : \ | |
155 | ((val) + 62) / 125 * 32) | |
156 | #define HYST_TO_REG(val) ((val) <= 0 ? 0 : (val) >= 30500 ? 31 : \ | |
157 | ((val) + 500) / 1000) | |
158 | ||
159 | /* | |
160 | * ADT7461 is almost identical to LM90 except that attempts to write | |
161 | * values that are outside the range 0 < temp < 127 are treated as | |
162 | * the boundary value. | |
163 | */ | |
164 | ||
165 | #define TEMP1_TO_REG_ADT7461(val) ((val) <= 0 ? 0 : \ | |
166 | (val) >= 127000 ? 127 : \ | |
167 | ((val) + 500) / 1000) | |
168 | #define TEMP2_TO_REG_ADT7461(val) ((val) <= 0 ? 0 : \ | |
169 | (val) >= 127750 ? 0x7FC0 : \ | |
170 | ((val) + 125) / 250 * 64) | |
171 | ||
172 | /* | |
173 | * Functions declaration | |
174 | */ | |
175 | ||
176 | static int lm90_attach_adapter(struct i2c_adapter *adapter); | |
177 | static int lm90_detect(struct i2c_adapter *adapter, int address, | |
178 | int kind); | |
179 | static void lm90_init_client(struct i2c_client *client); | |
180 | static int lm90_detach_client(struct i2c_client *client); | |
181 | static struct lm90_data *lm90_update_device(struct device *dev); | |
182 | ||
183 | /* | |
184 | * Driver data (common to all clients) | |
185 | */ | |
186 | ||
187 | static struct i2c_driver lm90_driver = { | |
188 | .owner = THIS_MODULE, | |
189 | .name = "lm90", | |
190 | .id = I2C_DRIVERID_LM90, | |
191 | .flags = I2C_DF_NOTIFY, | |
192 | .attach_adapter = lm90_attach_adapter, | |
193 | .detach_client = lm90_detach_client, | |
194 | }; | |
195 | ||
196 | /* | |
197 | * Client data (each client gets its own) | |
198 | */ | |
199 | ||
200 | struct lm90_data { | |
201 | struct i2c_client client; | |
202 | struct semaphore update_lock; | |
203 | char valid; /* zero until following fields are valid */ | |
204 | unsigned long last_updated; /* in jiffies */ | |
205 | int kind; | |
206 | ||
207 | /* registers values */ | |
208 | s8 temp_input1, temp_low1, temp_high1; /* local */ | |
209 | s16 temp_input2, temp_low2, temp_high2; /* remote, combined */ | |
210 | s8 temp_crit1, temp_crit2; | |
211 | u8 temp_hyst; | |
212 | u8 alarms; /* bitvector */ | |
213 | }; | |
214 | ||
215 | /* | |
216 | * Sysfs stuff | |
217 | */ | |
218 | ||
219 | #define show_temp(value, converter) \ | |
8627f9ba | 220 | static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
221 | { \ |
222 | struct lm90_data *data = lm90_update_device(dev); \ | |
223 | return sprintf(buf, "%d\n", converter(data->value)); \ | |
224 | } | |
225 | show_temp(temp_input1, TEMP1_FROM_REG); | |
226 | show_temp(temp_input2, TEMP2_FROM_REG); | |
227 | show_temp(temp_low1, TEMP1_FROM_REG); | |
228 | show_temp(temp_low2, TEMP2_FROM_REG); | |
229 | show_temp(temp_high1, TEMP1_FROM_REG); | |
230 | show_temp(temp_high2, TEMP2_FROM_REG); | |
231 | show_temp(temp_crit1, TEMP1_FROM_REG); | |
232 | show_temp(temp_crit2, TEMP1_FROM_REG); | |
233 | ||
234 | #define set_temp1(value, reg) \ | |
8627f9ba | 235 | static ssize_t set_##value(struct device *dev, struct device_attribute *attr, const char *buf, \ |
1da177e4 LT |
236 | size_t count) \ |
237 | { \ | |
238 | struct i2c_client *client = to_i2c_client(dev); \ | |
239 | struct lm90_data *data = i2c_get_clientdata(client); \ | |
240 | long val = simple_strtol(buf, NULL, 10); \ | |
241 | \ | |
242 | down(&data->update_lock); \ | |
243 | if (data->kind == adt7461) \ | |
244 | data->value = TEMP1_TO_REG_ADT7461(val); \ | |
245 | else \ | |
246 | data->value = TEMP1_TO_REG(val); \ | |
247 | i2c_smbus_write_byte_data(client, reg, data->value); \ | |
248 | up(&data->update_lock); \ | |
249 | return count; \ | |
250 | } | |
251 | #define set_temp2(value, regh, regl) \ | |
8627f9ba | 252 | static ssize_t set_##value(struct device *dev, struct device_attribute *attr, const char *buf, \ |
1da177e4 LT |
253 | size_t count) \ |
254 | { \ | |
255 | struct i2c_client *client = to_i2c_client(dev); \ | |
256 | struct lm90_data *data = i2c_get_clientdata(client); \ | |
257 | long val = simple_strtol(buf, NULL, 10); \ | |
258 | \ | |
259 | down(&data->update_lock); \ | |
260 | if (data->kind == adt7461) \ | |
261 | data->value = TEMP2_TO_REG_ADT7461(val); \ | |
262 | else \ | |
263 | data->value = TEMP2_TO_REG(val); \ | |
264 | i2c_smbus_write_byte_data(client, regh, data->value >> 8); \ | |
265 | i2c_smbus_write_byte_data(client, regl, data->value & 0xff); \ | |
266 | up(&data->update_lock); \ | |
267 | return count; \ | |
268 | } | |
269 | set_temp1(temp_low1, LM90_REG_W_LOCAL_LOW); | |
270 | set_temp2(temp_low2, LM90_REG_W_REMOTE_LOWH, LM90_REG_W_REMOTE_LOWL); | |
271 | set_temp1(temp_high1, LM90_REG_W_LOCAL_HIGH); | |
272 | set_temp2(temp_high2, LM90_REG_W_REMOTE_HIGHH, LM90_REG_W_REMOTE_HIGHL); | |
273 | set_temp1(temp_crit1, LM90_REG_W_LOCAL_CRIT); | |
274 | set_temp1(temp_crit2, LM90_REG_W_REMOTE_CRIT); | |
275 | ||
276 | #define show_temp_hyst(value, basereg) \ | |
8627f9ba | 277 | static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
278 | { \ |
279 | struct lm90_data *data = lm90_update_device(dev); \ | |
280 | return sprintf(buf, "%d\n", TEMP1_FROM_REG(data->basereg) \ | |
281 | - TEMP1_FROM_REG(data->temp_hyst)); \ | |
282 | } | |
283 | show_temp_hyst(temp_hyst1, temp_crit1); | |
284 | show_temp_hyst(temp_hyst2, temp_crit2); | |
285 | ||
8627f9ba | 286 | static ssize_t set_temp_hyst1(struct device *dev, struct device_attribute *attr, const char *buf, |
1da177e4 LT |
287 | size_t count) |
288 | { | |
289 | struct i2c_client *client = to_i2c_client(dev); | |
290 | struct lm90_data *data = i2c_get_clientdata(client); | |
291 | long val = simple_strtol(buf, NULL, 10); | |
292 | long hyst; | |
293 | ||
294 | down(&data->update_lock); | |
295 | hyst = TEMP1_FROM_REG(data->temp_crit1) - val; | |
296 | i2c_smbus_write_byte_data(client, LM90_REG_W_TCRIT_HYST, | |
297 | HYST_TO_REG(hyst)); | |
298 | up(&data->update_lock); | |
299 | return count; | |
300 | } | |
301 | ||
8627f9ba | 302 | static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
303 | { |
304 | struct lm90_data *data = lm90_update_device(dev); | |
305 | return sprintf(buf, "%d\n", data->alarms); | |
306 | } | |
307 | ||
308 | static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL); | |
309 | static DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input2, NULL); | |
310 | static DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp_low1, | |
311 | set_temp_low1); | |
312 | static DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp_low2, | |
313 | set_temp_low2); | |
314 | static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_high1, | |
315 | set_temp_high1); | |
316 | static DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_high2, | |
317 | set_temp_high2); | |
318 | static DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp_crit1, | |
319 | set_temp_crit1); | |
320 | static DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp_crit2, | |
321 | set_temp_crit2); | |
322 | static DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temp_hyst1, | |
323 | set_temp_hyst1); | |
324 | static DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temp_hyst2, NULL); | |
325 | static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); | |
326 | ||
327 | /* | |
328 | * Real code | |
329 | */ | |
330 | ||
331 | static int lm90_attach_adapter(struct i2c_adapter *adapter) | |
332 | { | |
333 | if (!(adapter->class & I2C_CLASS_HWMON)) | |
334 | return 0; | |
335 | return i2c_detect(adapter, &addr_data, lm90_detect); | |
336 | } | |
337 | ||
338 | /* | |
339 | * The following function does more than just detection. If detection | |
340 | * succeeds, it also registers the new chip. | |
341 | */ | |
342 | static int lm90_detect(struct i2c_adapter *adapter, int address, int kind) | |
343 | { | |
344 | struct i2c_client *new_client; | |
345 | struct lm90_data *data; | |
346 | int err = 0; | |
347 | const char *name = ""; | |
348 | ||
349 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
350 | goto exit; | |
351 | ||
352 | if (!(data = kmalloc(sizeof(struct lm90_data), GFP_KERNEL))) { | |
353 | err = -ENOMEM; | |
354 | goto exit; | |
355 | } | |
356 | memset(data, 0, sizeof(struct lm90_data)); | |
357 | ||
358 | /* The common I2C client data is placed right before the | |
359 | LM90-specific data. */ | |
360 | new_client = &data->client; | |
361 | i2c_set_clientdata(new_client, data); | |
362 | new_client->addr = address; | |
363 | new_client->adapter = adapter; | |
364 | new_client->driver = &lm90_driver; | |
365 | new_client->flags = 0; | |
366 | ||
367 | /* | |
368 | * Now we do the remaining detection. A negative kind means that | |
369 | * the driver was loaded with no force parameter (default), so we | |
370 | * must both detect and identify the chip. A zero kind means that | |
371 | * the driver was loaded with the force parameter, the detection | |
372 | * step shall be skipped. A positive kind means that the driver | |
373 | * was loaded with the force parameter and a given kind of chip is | |
374 | * requested, so both the detection and the identification steps | |
375 | * are skipped. | |
376 | */ | |
377 | ||
378 | /* Default to an LM90 if forced */ | |
379 | if (kind == 0) | |
380 | kind = lm90; | |
381 | ||
382 | if (kind < 0) { /* detection and identification */ | |
383 | u8 man_id, chip_id, reg_config1, reg_convrate; | |
384 | ||
385 | man_id = i2c_smbus_read_byte_data(new_client, | |
386 | LM90_REG_R_MAN_ID); | |
387 | chip_id = i2c_smbus_read_byte_data(new_client, | |
388 | LM90_REG_R_CHIP_ID); | |
389 | reg_config1 = i2c_smbus_read_byte_data(new_client, | |
390 | LM90_REG_R_CONFIG1); | |
391 | reg_convrate = i2c_smbus_read_byte_data(new_client, | |
392 | LM90_REG_R_CONVRATE); | |
393 | ||
394 | if (man_id == 0x01) { /* National Semiconductor */ | |
395 | u8 reg_config2; | |
396 | ||
397 | reg_config2 = i2c_smbus_read_byte_data(new_client, | |
398 | LM90_REG_R_CONFIG2); | |
399 | ||
400 | if ((reg_config1 & 0x2A) == 0x00 | |
401 | && (reg_config2 & 0xF8) == 0x00 | |
402 | && reg_convrate <= 0x09) { | |
403 | if (address == 0x4C | |
404 | && (chip_id & 0xF0) == 0x20) { /* LM90 */ | |
405 | kind = lm90; | |
406 | } else | |
407 | if ((chip_id & 0xF0) == 0x30) { /* LM89/LM99 */ | |
408 | kind = lm99; | |
409 | } else | |
410 | if (address == 0x4C | |
411 | && (chip_id & 0xF0) == 0x10) { /* LM86 */ | |
412 | kind = lm86; | |
413 | } | |
414 | } | |
415 | } else | |
416 | if (man_id == 0x41) { /* Analog Devices */ | |
417 | if (address == 0x4C | |
418 | && (chip_id & 0xF0) == 0x40 /* ADM1032 */ | |
419 | && (reg_config1 & 0x3F) == 0x00 | |
420 | && reg_convrate <= 0x0A) { | |
421 | kind = adm1032; | |
422 | } else | |
423 | if (address == 0x4c | |
424 | && chip_id == 0x51 /* ADT7461 */ | |
425 | && (reg_config1 & 0x1F) == 0x00 /* check compat mode */ | |
426 | && reg_convrate <= 0x0A) { | |
427 | kind = adt7461; | |
428 | } | |
429 | } else | |
430 | if (man_id == 0x4D) { /* Maxim */ | |
431 | /* | |
432 | * The Maxim variants do NOT have a chip_id register. | |
433 | * Reading from that address will return the last read | |
434 | * value, which in our case is those of the man_id | |
435 | * register. Likewise, the config1 register seems to | |
436 | * lack a low nibble, so the value will be those of the | |
437 | * previous read, so in our case those of the man_id | |
438 | * register. | |
439 | */ | |
440 | if (chip_id == man_id | |
441 | && (reg_config1 & 0x1F) == (man_id & 0x0F) | |
442 | && reg_convrate <= 0x09) { | |
443 | kind = max6657; | |
444 | } | |
445 | } | |
446 | ||
447 | if (kind <= 0) { /* identification failed */ | |
448 | dev_info(&adapter->dev, | |
449 | "Unsupported chip (man_id=0x%02X, " | |
450 | "chip_id=0x%02X).\n", man_id, chip_id); | |
451 | goto exit_free; | |
452 | } | |
453 | } | |
454 | ||
455 | if (kind == lm90) { | |
456 | name = "lm90"; | |
457 | } else if (kind == adm1032) { | |
458 | name = "adm1032"; | |
459 | } else if (kind == lm99) { | |
460 | name = "lm99"; | |
461 | } else if (kind == lm86) { | |
462 | name = "lm86"; | |
463 | } else if (kind == max6657) { | |
464 | name = "max6657"; | |
465 | } else if (kind == adt7461) { | |
466 | name = "adt7461"; | |
467 | } | |
468 | ||
469 | /* We can fill in the remaining client fields */ | |
470 | strlcpy(new_client->name, name, I2C_NAME_SIZE); | |
471 | data->valid = 0; | |
472 | data->kind = kind; | |
473 | init_MUTEX(&data->update_lock); | |
474 | ||
475 | /* Tell the I2C layer a new client has arrived */ | |
476 | if ((err = i2c_attach_client(new_client))) | |
477 | goto exit_free; | |
478 | ||
479 | /* Initialize the LM90 chip */ | |
480 | lm90_init_client(new_client); | |
481 | ||
482 | /* Register sysfs hooks */ | |
483 | device_create_file(&new_client->dev, &dev_attr_temp1_input); | |
484 | device_create_file(&new_client->dev, &dev_attr_temp2_input); | |
485 | device_create_file(&new_client->dev, &dev_attr_temp1_min); | |
486 | device_create_file(&new_client->dev, &dev_attr_temp2_min); | |
487 | device_create_file(&new_client->dev, &dev_attr_temp1_max); | |
488 | device_create_file(&new_client->dev, &dev_attr_temp2_max); | |
489 | device_create_file(&new_client->dev, &dev_attr_temp1_crit); | |
490 | device_create_file(&new_client->dev, &dev_attr_temp2_crit); | |
491 | device_create_file(&new_client->dev, &dev_attr_temp1_crit_hyst); | |
492 | device_create_file(&new_client->dev, &dev_attr_temp2_crit_hyst); | |
493 | device_create_file(&new_client->dev, &dev_attr_alarms); | |
494 | ||
495 | return 0; | |
496 | ||
497 | exit_free: | |
498 | kfree(data); | |
499 | exit: | |
500 | return err; | |
501 | } | |
502 | ||
503 | static void lm90_init_client(struct i2c_client *client) | |
504 | { | |
505 | u8 config; | |
506 | ||
507 | /* | |
508 | * Start the conversions. | |
509 | */ | |
510 | i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE, | |
511 | 5); /* 2 Hz */ | |
512 | config = i2c_smbus_read_byte_data(client, LM90_REG_R_CONFIG1); | |
513 | if (config & 0x40) | |
514 | i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, | |
515 | config & 0xBF); /* run */ | |
516 | } | |
517 | ||
518 | static int lm90_detach_client(struct i2c_client *client) | |
519 | { | |
520 | int err; | |
521 | ||
522 | if ((err = i2c_detach_client(client))) { | |
523 | dev_err(&client->dev, "Client deregistration failed, " | |
524 | "client not detached.\n"); | |
525 | return err; | |
526 | } | |
527 | ||
528 | kfree(i2c_get_clientdata(client)); | |
529 | return 0; | |
530 | } | |
531 | ||
532 | static struct lm90_data *lm90_update_device(struct device *dev) | |
533 | { | |
534 | struct i2c_client *client = to_i2c_client(dev); | |
535 | struct lm90_data *data = i2c_get_clientdata(client); | |
536 | ||
537 | down(&data->update_lock); | |
538 | ||
539 | if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) { | |
540 | u8 oldh, newh; | |
541 | ||
542 | dev_dbg(&client->dev, "Updating lm90 data.\n"); | |
543 | data->temp_input1 = i2c_smbus_read_byte_data(client, | |
544 | LM90_REG_R_LOCAL_TEMP); | |
545 | data->temp_high1 = i2c_smbus_read_byte_data(client, | |
546 | LM90_REG_R_LOCAL_HIGH); | |
547 | data->temp_low1 = i2c_smbus_read_byte_data(client, | |
548 | LM90_REG_R_LOCAL_LOW); | |
549 | data->temp_crit1 = i2c_smbus_read_byte_data(client, | |
550 | LM90_REG_R_LOCAL_CRIT); | |
551 | data->temp_crit2 = i2c_smbus_read_byte_data(client, | |
552 | LM90_REG_R_REMOTE_CRIT); | |
553 | data->temp_hyst = i2c_smbus_read_byte_data(client, | |
554 | LM90_REG_R_TCRIT_HYST); | |
555 | ||
556 | /* | |
557 | * There is a trick here. We have to read two registers to | |
558 | * have the remote sensor temperature, but we have to beware | |
559 | * a conversion could occur inbetween the readings. The | |
560 | * datasheet says we should either use the one-shot | |
561 | * conversion register, which we don't want to do (disables | |
562 | * hardware monitoring) or monitor the busy bit, which is | |
563 | * impossible (we can't read the values and monitor that bit | |
564 | * at the exact same time). So the solution used here is to | |
565 | * read the high byte once, then the low byte, then the high | |
566 | * byte again. If the new high byte matches the old one, | |
567 | * then we have a valid reading. Else we have to read the low | |
568 | * byte again, and now we believe we have a correct reading. | |
569 | */ | |
570 | oldh = i2c_smbus_read_byte_data(client, | |
571 | LM90_REG_R_REMOTE_TEMPH); | |
572 | data->temp_input2 = i2c_smbus_read_byte_data(client, | |
573 | LM90_REG_R_REMOTE_TEMPL); | |
574 | newh = i2c_smbus_read_byte_data(client, | |
575 | LM90_REG_R_REMOTE_TEMPH); | |
576 | if (newh != oldh) { | |
577 | data->temp_input2 = i2c_smbus_read_byte_data(client, | |
578 | LM90_REG_R_REMOTE_TEMPL); | |
579 | #ifdef DEBUG | |
580 | oldh = i2c_smbus_read_byte_data(client, | |
581 | LM90_REG_R_REMOTE_TEMPH); | |
582 | /* oldh is actually newer */ | |
583 | if (newh != oldh) | |
584 | dev_warn(&client->dev, "Remote temperature may be " | |
585 | "wrong.\n"); | |
586 | #endif | |
587 | } | |
588 | data->temp_input2 |= (newh << 8); | |
589 | ||
590 | data->temp_high2 = (i2c_smbus_read_byte_data(client, | |
591 | LM90_REG_R_REMOTE_HIGHH) << 8) + | |
592 | i2c_smbus_read_byte_data(client, | |
593 | LM90_REG_R_REMOTE_HIGHL); | |
594 | data->temp_low2 = (i2c_smbus_read_byte_data(client, | |
595 | LM90_REG_R_REMOTE_LOWH) << 8) + | |
596 | i2c_smbus_read_byte_data(client, | |
597 | LM90_REG_R_REMOTE_LOWL); | |
598 | data->alarms = i2c_smbus_read_byte_data(client, | |
599 | LM90_REG_R_STATUS); | |
600 | ||
601 | data->last_updated = jiffies; | |
602 | data->valid = 1; | |
603 | } | |
604 | ||
605 | up(&data->update_lock); | |
606 | ||
607 | return data; | |
608 | } | |
609 | ||
610 | static int __init sensors_lm90_init(void) | |
611 | { | |
612 | return i2c_add_driver(&lm90_driver); | |
613 | } | |
614 | ||
615 | static void __exit sensors_lm90_exit(void) | |
616 | { | |
617 | i2c_del_driver(&lm90_driver); | |
618 | } | |
619 | ||
620 | MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>"); | |
621 | MODULE_DESCRIPTION("LM90/ADM1032 driver"); | |
622 | MODULE_LICENSE("GPL"); | |
623 | ||
624 | module_init(sensors_lm90_init); | |
625 | module_exit(sensors_lm90_exit); |