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1da177e4 LT |
1 | /* |
2 | * adm1025.c | |
3 | * | |
4 | * Copyright (C) 2000 Chen-Yuan Wu <gwu@esoft.com> | |
5 | * Copyright (C) 2003-2004 Jean Delvare <khali@linux-fr.org> | |
6 | * | |
7 | * The ADM1025 is a sensor chip made by Analog Devices. It reports up to 6 | |
8 | * voltages (including its own power source) and up to two temperatures | |
9 | * (its own plus up to one external one). Voltages are scaled internally | |
10 | * (which is not the common way) with ratios such that the nominal value | |
11 | * of each voltage correspond to a register value of 192 (which means a | |
12 | * resolution of about 0.5% of the nominal value). Temperature values are | |
13 | * reported with a 1 deg resolution and a 3 deg accuracy. Complete | |
14 | * datasheet can be obtained from Analog's website at: | |
15 | * http://www.analog.com/Analog_Root/productPage/productHome/0,2121,ADM1025,00.html | |
16 | * | |
17 | * This driver also supports the ADM1025A, which differs from the ADM1025 | |
18 | * only in that it has "open-drain VID inputs while the ADM1025 has | |
19 | * on-chip 100k pull-ups on the VID inputs". It doesn't make any | |
20 | * difference for us. | |
21 | * | |
22 | * This driver also supports the NE1619, a sensor chip made by Philips. | |
23 | * That chip is similar to the ADM1025A, with a few differences. The only | |
24 | * difference that matters to us is that the NE1619 has only two possible | |
25 | * addresses while the ADM1025A has a third one. Complete datasheet can be | |
26 | * obtained from Philips's website at: | |
27 | * http://www.semiconductors.philips.com/pip/NE1619DS.html | |
28 | * | |
29 | * Since the ADM1025 was the first chipset supported by this driver, most | |
30 | * comments will refer to this chipset, but are actually general and | |
31 | * concern all supported chipsets, unless mentioned otherwise. | |
32 | * | |
33 | * This program is free software; you can redistribute it and/or modify | |
34 | * it under the terms of the GNU General Public License as published by | |
35 | * the Free Software Foundation; either version 2 of the License, or | |
36 | * (at your option) any later version. | |
37 | * | |
38 | * This program is distributed in the hope that it will be useful, | |
39 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
40 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
41 | * GNU General Public License for more details. | |
42 | * | |
43 | * You should have received a copy of the GNU General Public License | |
44 | * along with this program; if not, write to the Free Software | |
45 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
46 | */ | |
47 | ||
1da177e4 LT |
48 | #include <linux/module.h> |
49 | #include <linux/init.h> | |
50 | #include <linux/slab.h> | |
51 | #include <linux/jiffies.h> | |
52 | #include <linux/i2c.h> | |
53 | #include <linux/i2c-sensor.h> | |
54 | #include <linux/i2c-vid.h> | |
55 | ||
56 | /* | |
57 | * Addresses to scan | |
58 | * ADM1025 and ADM1025A have three possible addresses: 0x2c, 0x2d and 0x2e. | |
59 | * NE1619 has two possible addresses: 0x2c and 0x2d. | |
60 | */ | |
61 | ||
62 | static unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END }; | |
63 | static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END }; | |
64 | ||
65 | /* | |
66 | * Insmod parameters | |
67 | */ | |
68 | ||
69 | SENSORS_INSMOD_2(adm1025, ne1619); | |
70 | ||
71 | /* | |
72 | * The ADM1025 registers | |
73 | */ | |
74 | ||
75 | #define ADM1025_REG_MAN_ID 0x3E | |
76 | #define ADM1025_REG_CHIP_ID 0x3F | |
77 | #define ADM1025_REG_CONFIG 0x40 | |
78 | #define ADM1025_REG_STATUS1 0x41 | |
79 | #define ADM1025_REG_STATUS2 0x42 | |
80 | #define ADM1025_REG_IN(nr) (0x20 + (nr)) | |
81 | #define ADM1025_REG_IN_MAX(nr) (0x2B + (nr) * 2) | |
82 | #define ADM1025_REG_IN_MIN(nr) (0x2C + (nr) * 2) | |
83 | #define ADM1025_REG_TEMP(nr) (0x26 + (nr)) | |
84 | #define ADM1025_REG_TEMP_HIGH(nr) (0x37 + (nr) * 2) | |
85 | #define ADM1025_REG_TEMP_LOW(nr) (0x38 + (nr) * 2) | |
86 | #define ADM1025_REG_VID 0x47 | |
87 | #define ADM1025_REG_VID4 0x49 | |
88 | ||
89 | /* | |
90 | * Conversions and various macros | |
91 | * The ADM1025 uses signed 8-bit values for temperatures. | |
92 | */ | |
93 | ||
94 | static int in_scale[6] = { 2500, 2250, 3300, 5000, 12000, 3300 }; | |
95 | ||
96 | #define IN_FROM_REG(reg,scale) (((reg) * (scale) + 96) / 192) | |
97 | #define IN_TO_REG(val,scale) ((val) <= 0 ? 0 : \ | |
98 | (val) * 192 >= (scale) * 255 ? 255 : \ | |
99 | ((val) * 192 + (scale)/2) / (scale)) | |
100 | ||
101 | #define TEMP_FROM_REG(reg) ((reg) * 1000) | |
102 | #define TEMP_TO_REG(val) ((val) <= -127500 ? -128 : \ | |
103 | (val) >= 126500 ? 127 : \ | |
104 | (((val) < 0 ? (val)-500 : (val)+500) / 1000)) | |
105 | ||
106 | /* | |
107 | * Functions declaration | |
108 | */ | |
109 | ||
110 | static int adm1025_attach_adapter(struct i2c_adapter *adapter); | |
111 | static int adm1025_detect(struct i2c_adapter *adapter, int address, int kind); | |
112 | static void adm1025_init_client(struct i2c_client *client); | |
113 | static int adm1025_detach_client(struct i2c_client *client); | |
114 | static struct adm1025_data *adm1025_update_device(struct device *dev); | |
115 | ||
116 | /* | |
117 | * Driver data (common to all clients) | |
118 | */ | |
119 | ||
120 | static struct i2c_driver adm1025_driver = { | |
121 | .owner = THIS_MODULE, | |
122 | .name = "adm1025", | |
123 | .id = I2C_DRIVERID_ADM1025, | |
124 | .flags = I2C_DF_NOTIFY, | |
125 | .attach_adapter = adm1025_attach_adapter, | |
126 | .detach_client = adm1025_detach_client, | |
127 | }; | |
128 | ||
129 | /* | |
130 | * Client data (each client gets its own) | |
131 | */ | |
132 | ||
133 | struct adm1025_data { | |
134 | struct i2c_client client; | |
135 | struct semaphore update_lock; | |
136 | char valid; /* zero until following fields are valid */ | |
137 | unsigned long last_updated; /* in jiffies */ | |
138 | ||
139 | u8 in[6]; /* register value */ | |
140 | u8 in_max[6]; /* register value */ | |
141 | u8 in_min[6]; /* register value */ | |
142 | s8 temp[2]; /* register value */ | |
143 | s8 temp_min[2]; /* register value */ | |
144 | s8 temp_max[2]; /* register value */ | |
145 | u16 alarms; /* register values, combined */ | |
146 | u8 vid; /* register values, combined */ | |
147 | u8 vrm; | |
148 | }; | |
149 | ||
150 | /* | |
151 | * Sysfs stuff | |
152 | */ | |
153 | ||
154 | #define show_in(offset) \ | |
74880c06 | 155 | static ssize_t show_in##offset(struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
156 | { \ |
157 | struct adm1025_data *data = adm1025_update_device(dev); \ | |
158 | return sprintf(buf, "%u\n", IN_FROM_REG(data->in[offset], \ | |
159 | in_scale[offset])); \ | |
160 | } \ | |
74880c06 | 161 | static ssize_t show_in##offset##_min(struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
162 | { \ |
163 | struct adm1025_data *data = adm1025_update_device(dev); \ | |
164 | return sprintf(buf, "%u\n", IN_FROM_REG(data->in_min[offset], \ | |
165 | in_scale[offset])); \ | |
166 | } \ | |
74880c06 | 167 | static ssize_t show_in##offset##_max(struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
168 | { \ |
169 | struct adm1025_data *data = adm1025_update_device(dev); \ | |
170 | return sprintf(buf, "%u\n", IN_FROM_REG(data->in_max[offset], \ | |
171 | in_scale[offset])); \ | |
172 | } \ | |
173 | static DEVICE_ATTR(in##offset##_input, S_IRUGO, show_in##offset, NULL); | |
174 | show_in(0); | |
175 | show_in(1); | |
176 | show_in(2); | |
177 | show_in(3); | |
178 | show_in(4); | |
179 | show_in(5); | |
180 | ||
181 | #define show_temp(offset) \ | |
74880c06 | 182 | static ssize_t show_temp##offset(struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
183 | { \ |
184 | struct adm1025_data *data = adm1025_update_device(dev); \ | |
185 | return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[offset-1])); \ | |
186 | } \ | |
74880c06 | 187 | static ssize_t show_temp##offset##_min(struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
188 | { \ |
189 | struct adm1025_data *data = adm1025_update_device(dev); \ | |
190 | return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_min[offset-1])); \ | |
191 | } \ | |
74880c06 | 192 | static ssize_t show_temp##offset##_max(struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
193 | { \ |
194 | struct adm1025_data *data = adm1025_update_device(dev); \ | |
195 | return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[offset-1])); \ | |
196 | }\ | |
197 | static DEVICE_ATTR(temp##offset##_input, S_IRUGO, show_temp##offset, NULL); | |
198 | show_temp(1); | |
199 | show_temp(2); | |
200 | ||
201 | #define set_in(offset) \ | |
74880c06 | 202 | static ssize_t set_in##offset##_min(struct device *dev, struct device_attribute *attr, const char *buf, \ |
1da177e4 LT |
203 | size_t count) \ |
204 | { \ | |
205 | struct i2c_client *client = to_i2c_client(dev); \ | |
206 | struct adm1025_data *data = i2c_get_clientdata(client); \ | |
207 | long val = simple_strtol(buf, NULL, 10); \ | |
208 | \ | |
209 | down(&data->update_lock); \ | |
210 | data->in_min[offset] = IN_TO_REG(val, in_scale[offset]); \ | |
211 | i2c_smbus_write_byte_data(client, ADM1025_REG_IN_MIN(offset), \ | |
212 | data->in_min[offset]); \ | |
213 | up(&data->update_lock); \ | |
214 | return count; \ | |
215 | } \ | |
74880c06 | 216 | static ssize_t set_in##offset##_max(struct device *dev, struct device_attribute *attr, const char *buf, \ |
1da177e4 LT |
217 | size_t count) \ |
218 | { \ | |
219 | struct i2c_client *client = to_i2c_client(dev); \ | |
220 | struct adm1025_data *data = i2c_get_clientdata(client); \ | |
221 | long val = simple_strtol(buf, NULL, 10); \ | |
222 | \ | |
223 | down(&data->update_lock); \ | |
224 | data->in_max[offset] = IN_TO_REG(val, in_scale[offset]); \ | |
225 | i2c_smbus_write_byte_data(client, ADM1025_REG_IN_MAX(offset), \ | |
226 | data->in_max[offset]); \ | |
227 | up(&data->update_lock); \ | |
228 | return count; \ | |
229 | } \ | |
230 | static DEVICE_ATTR(in##offset##_min, S_IWUSR | S_IRUGO, \ | |
231 | show_in##offset##_min, set_in##offset##_min); \ | |
232 | static DEVICE_ATTR(in##offset##_max, S_IWUSR | S_IRUGO, \ | |
233 | show_in##offset##_max, set_in##offset##_max); | |
234 | set_in(0); | |
235 | set_in(1); | |
236 | set_in(2); | |
237 | set_in(3); | |
238 | set_in(4); | |
239 | set_in(5); | |
240 | ||
241 | #define set_temp(offset) \ | |
74880c06 | 242 | static ssize_t set_temp##offset##_min(struct device *dev, struct device_attribute *attr, const char *buf, \ |
1da177e4 LT |
243 | size_t count) \ |
244 | { \ | |
245 | struct i2c_client *client = to_i2c_client(dev); \ | |
246 | struct adm1025_data *data = i2c_get_clientdata(client); \ | |
247 | long val = simple_strtol(buf, NULL, 10); \ | |
248 | \ | |
249 | down(&data->update_lock); \ | |
250 | data->temp_min[offset-1] = TEMP_TO_REG(val); \ | |
251 | i2c_smbus_write_byte_data(client, ADM1025_REG_TEMP_LOW(offset-1), \ | |
252 | data->temp_min[offset-1]); \ | |
253 | up(&data->update_lock); \ | |
254 | return count; \ | |
255 | } \ | |
74880c06 | 256 | static ssize_t set_temp##offset##_max(struct device *dev, struct device_attribute *attr, const char *buf, \ |
1da177e4 LT |
257 | size_t count) \ |
258 | { \ | |
259 | struct i2c_client *client = to_i2c_client(dev); \ | |
260 | struct adm1025_data *data = i2c_get_clientdata(client); \ | |
261 | long val = simple_strtol(buf, NULL, 10); \ | |
262 | \ | |
263 | down(&data->update_lock); \ | |
264 | data->temp_max[offset-1] = TEMP_TO_REG(val); \ | |
265 | i2c_smbus_write_byte_data(client, ADM1025_REG_TEMP_HIGH(offset-1), \ | |
266 | data->temp_max[offset-1]); \ | |
267 | up(&data->update_lock); \ | |
268 | return count; \ | |
269 | } \ | |
270 | static DEVICE_ATTR(temp##offset##_min, S_IWUSR | S_IRUGO, \ | |
271 | show_temp##offset##_min, set_temp##offset##_min); \ | |
272 | static DEVICE_ATTR(temp##offset##_max, S_IWUSR | S_IRUGO, \ | |
273 | show_temp##offset##_max, set_temp##offset##_max); | |
274 | set_temp(1); | |
275 | set_temp(2); | |
276 | ||
74880c06 | 277 | static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
278 | { |
279 | struct adm1025_data *data = adm1025_update_device(dev); | |
280 | return sprintf(buf, "%u\n", data->alarms); | |
281 | } | |
282 | static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); | |
283 | ||
74880c06 | 284 | static ssize_t show_vid(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
285 | { |
286 | struct adm1025_data *data = adm1025_update_device(dev); | |
287 | return sprintf(buf, "%u\n", vid_from_reg(data->vid, data->vrm)); | |
288 | } | |
937df8df | 289 | /* in1_ref is deprecated in favour of cpu0_vid, remove after 2005-11-11 */ |
1da177e4 | 290 | static DEVICE_ATTR(in1_ref, S_IRUGO, show_vid, NULL); |
937df8df | 291 | static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL); |
1da177e4 | 292 | |
74880c06 | 293 | static ssize_t show_vrm(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
294 | { |
295 | struct adm1025_data *data = adm1025_update_device(dev); | |
296 | return sprintf(buf, "%u\n", data->vrm); | |
297 | } | |
74880c06 | 298 | static ssize_t set_vrm(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
299 | { |
300 | struct i2c_client *client = to_i2c_client(dev); | |
301 | struct adm1025_data *data = i2c_get_clientdata(client); | |
302 | data->vrm = simple_strtoul(buf, NULL, 10); | |
303 | return count; | |
304 | } | |
305 | static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm); | |
306 | ||
307 | /* | |
308 | * Real code | |
309 | */ | |
310 | ||
311 | static int adm1025_attach_adapter(struct i2c_adapter *adapter) | |
312 | { | |
313 | if (!(adapter->class & I2C_CLASS_HWMON)) | |
314 | return 0; | |
315 | return i2c_detect(adapter, &addr_data, adm1025_detect); | |
316 | } | |
317 | ||
318 | /* | |
319 | * The following function does more than just detection. If detection | |
320 | * succeeds, it also registers the new chip. | |
321 | */ | |
322 | static int adm1025_detect(struct i2c_adapter *adapter, int address, int kind) | |
323 | { | |
324 | struct i2c_client *new_client; | |
325 | struct adm1025_data *data; | |
326 | int err = 0; | |
327 | const char *name = ""; | |
328 | u8 config; | |
329 | ||
330 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
331 | goto exit; | |
332 | ||
333 | if (!(data = kmalloc(sizeof(struct adm1025_data), GFP_KERNEL))) { | |
334 | err = -ENOMEM; | |
335 | goto exit; | |
336 | } | |
337 | memset(data, 0, sizeof(struct adm1025_data)); | |
338 | ||
339 | /* The common I2C client data is placed right before the | |
340 | ADM1025-specific data. */ | |
341 | new_client = &data->client; | |
342 | i2c_set_clientdata(new_client, data); | |
343 | new_client->addr = address; | |
344 | new_client->adapter = adapter; | |
345 | new_client->driver = &adm1025_driver; | |
346 | new_client->flags = 0; | |
347 | ||
348 | /* | |
349 | * Now we do the remaining detection. A negative kind means that | |
350 | * the driver was loaded with no force parameter (default), so we | |
351 | * must both detect and identify the chip. A zero kind means that | |
352 | * the driver was loaded with the force parameter, the detection | |
353 | * step shall be skipped. A positive kind means that the driver | |
354 | * was loaded with the force parameter and a given kind of chip is | |
355 | * requested, so both the detection and the identification steps | |
356 | * are skipped. | |
357 | */ | |
358 | config = i2c_smbus_read_byte_data(new_client, ADM1025_REG_CONFIG); | |
359 | if (kind < 0) { /* detection */ | |
360 | if ((config & 0x80) != 0x00 | |
361 | || (i2c_smbus_read_byte_data(new_client, | |
362 | ADM1025_REG_STATUS1) & 0xC0) != 0x00 | |
363 | || (i2c_smbus_read_byte_data(new_client, | |
364 | ADM1025_REG_STATUS2) & 0xBC) != 0x00) { | |
365 | dev_dbg(&adapter->dev, | |
366 | "ADM1025 detection failed at 0x%02x.\n", | |
367 | address); | |
368 | goto exit_free; | |
369 | } | |
370 | } | |
371 | ||
372 | if (kind <= 0) { /* identification */ | |
373 | u8 man_id, chip_id; | |
374 | ||
375 | man_id = i2c_smbus_read_byte_data(new_client, | |
376 | ADM1025_REG_MAN_ID); | |
377 | chip_id = i2c_smbus_read_byte_data(new_client, | |
378 | ADM1025_REG_CHIP_ID); | |
379 | ||
380 | if (man_id == 0x41) { /* Analog Devices */ | |
381 | if ((chip_id & 0xF0) == 0x20) { /* ADM1025/ADM1025A */ | |
382 | kind = adm1025; | |
383 | } | |
384 | } else | |
385 | if (man_id == 0xA1) { /* Philips */ | |
386 | if (address != 0x2E | |
387 | && (chip_id & 0xF0) == 0x20) { /* NE1619 */ | |
388 | kind = ne1619; | |
389 | } | |
390 | } | |
391 | ||
392 | if (kind <= 0) { /* identification failed */ | |
393 | dev_info(&adapter->dev, | |
394 | "Unsupported chip (man_id=0x%02X, " | |
395 | "chip_id=0x%02X).\n", man_id, chip_id); | |
396 | goto exit_free; | |
397 | } | |
398 | } | |
399 | ||
400 | if (kind == adm1025) { | |
401 | name = "adm1025"; | |
402 | } else if (kind == ne1619) { | |
403 | name = "ne1619"; | |
404 | } | |
405 | ||
406 | /* We can fill in the remaining client fields */ | |
407 | strlcpy(new_client->name, name, I2C_NAME_SIZE); | |
408 | data->valid = 0; | |
409 | init_MUTEX(&data->update_lock); | |
410 | ||
411 | /* Tell the I2C layer a new client has arrived */ | |
412 | if ((err = i2c_attach_client(new_client))) | |
413 | goto exit_free; | |
414 | ||
415 | /* Initialize the ADM1025 chip */ | |
416 | adm1025_init_client(new_client); | |
417 | ||
418 | /* Register sysfs hooks */ | |
419 | device_create_file(&new_client->dev, &dev_attr_in0_input); | |
420 | device_create_file(&new_client->dev, &dev_attr_in1_input); | |
421 | device_create_file(&new_client->dev, &dev_attr_in2_input); | |
422 | device_create_file(&new_client->dev, &dev_attr_in3_input); | |
423 | device_create_file(&new_client->dev, &dev_attr_in5_input); | |
424 | device_create_file(&new_client->dev, &dev_attr_in0_min); | |
425 | device_create_file(&new_client->dev, &dev_attr_in1_min); | |
426 | device_create_file(&new_client->dev, &dev_attr_in2_min); | |
427 | device_create_file(&new_client->dev, &dev_attr_in3_min); | |
428 | device_create_file(&new_client->dev, &dev_attr_in5_min); | |
429 | device_create_file(&new_client->dev, &dev_attr_in0_max); | |
430 | device_create_file(&new_client->dev, &dev_attr_in1_max); | |
431 | device_create_file(&new_client->dev, &dev_attr_in2_max); | |
432 | device_create_file(&new_client->dev, &dev_attr_in3_max); | |
433 | device_create_file(&new_client->dev, &dev_attr_in5_max); | |
434 | device_create_file(&new_client->dev, &dev_attr_temp1_input); | |
435 | device_create_file(&new_client->dev, &dev_attr_temp2_input); | |
436 | device_create_file(&new_client->dev, &dev_attr_temp1_min); | |
437 | device_create_file(&new_client->dev, &dev_attr_temp2_min); | |
438 | device_create_file(&new_client->dev, &dev_attr_temp1_max); | |
439 | device_create_file(&new_client->dev, &dev_attr_temp2_max); | |
440 | device_create_file(&new_client->dev, &dev_attr_alarms); | |
937df8df | 441 | /* in1_ref is deprecated, remove after 2005-11-11 */ |
1da177e4 | 442 | device_create_file(&new_client->dev, &dev_attr_in1_ref); |
937df8df | 443 | device_create_file(&new_client->dev, &dev_attr_cpu0_vid); |
1da177e4 LT |
444 | device_create_file(&new_client->dev, &dev_attr_vrm); |
445 | ||
446 | /* Pin 11 is either in4 (+12V) or VID4 */ | |
447 | if (!(config & 0x20)) { | |
448 | device_create_file(&new_client->dev, &dev_attr_in4_input); | |
449 | device_create_file(&new_client->dev, &dev_attr_in4_min); | |
450 | device_create_file(&new_client->dev, &dev_attr_in4_max); | |
451 | } | |
452 | ||
453 | return 0; | |
454 | ||
455 | exit_free: | |
456 | kfree(data); | |
457 | exit: | |
458 | return err; | |
459 | } | |
460 | ||
461 | static void adm1025_init_client(struct i2c_client *client) | |
462 | { | |
463 | u8 reg; | |
464 | struct adm1025_data *data = i2c_get_clientdata(client); | |
465 | int i; | |
466 | ||
467 | data->vrm = i2c_which_vrm(); | |
468 | ||
469 | /* | |
470 | * Set high limits | |
471 | * Usually we avoid setting limits on driver init, but it happens | |
472 | * that the ADM1025 comes with stupid default limits (all registers | |
473 | * set to 0). In case the chip has not gone through any limit | |
474 | * setting yet, we better set the high limits to the max so that | |
475 | * no alarm triggers. | |
476 | */ | |
477 | for (i=0; i<6; i++) { | |
478 | reg = i2c_smbus_read_byte_data(client, | |
479 | ADM1025_REG_IN_MAX(i)); | |
480 | if (reg == 0) | |
481 | i2c_smbus_write_byte_data(client, | |
482 | ADM1025_REG_IN_MAX(i), | |
483 | 0xFF); | |
484 | } | |
485 | for (i=0; i<2; i++) { | |
486 | reg = i2c_smbus_read_byte_data(client, | |
487 | ADM1025_REG_TEMP_HIGH(i)); | |
488 | if (reg == 0) | |
489 | i2c_smbus_write_byte_data(client, | |
490 | ADM1025_REG_TEMP_HIGH(i), | |
491 | 0x7F); | |
492 | } | |
493 | ||
494 | /* | |
495 | * Start the conversions | |
496 | */ | |
497 | reg = i2c_smbus_read_byte_data(client, ADM1025_REG_CONFIG); | |
498 | if (!(reg & 0x01)) | |
499 | i2c_smbus_write_byte_data(client, ADM1025_REG_CONFIG, | |
500 | (reg&0x7E)|0x01); | |
501 | } | |
502 | ||
503 | static int adm1025_detach_client(struct i2c_client *client) | |
504 | { | |
505 | int err; | |
506 | ||
507 | if ((err = i2c_detach_client(client))) { | |
508 | dev_err(&client->dev, "Client deregistration failed, " | |
509 | "client not detached.\n"); | |
510 | return err; | |
511 | } | |
512 | ||
513 | kfree(i2c_get_clientdata(client)); | |
514 | return 0; | |
515 | } | |
516 | ||
517 | static struct adm1025_data *adm1025_update_device(struct device *dev) | |
518 | { | |
519 | struct i2c_client *client = to_i2c_client(dev); | |
520 | struct adm1025_data *data = i2c_get_clientdata(client); | |
521 | ||
522 | down(&data->update_lock); | |
523 | ||
524 | if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) { | |
525 | int i; | |
526 | ||
527 | dev_dbg(&client->dev, "Updating data.\n"); | |
528 | for (i=0; i<6; i++) { | |
529 | data->in[i] = i2c_smbus_read_byte_data(client, | |
530 | ADM1025_REG_IN(i)); | |
531 | data->in_min[i] = i2c_smbus_read_byte_data(client, | |
532 | ADM1025_REG_IN_MIN(i)); | |
533 | data->in_max[i] = i2c_smbus_read_byte_data(client, | |
534 | ADM1025_REG_IN_MAX(i)); | |
535 | } | |
536 | for (i=0; i<2; i++) { | |
537 | data->temp[i] = i2c_smbus_read_byte_data(client, | |
538 | ADM1025_REG_TEMP(i)); | |
539 | data->temp_min[i] = i2c_smbus_read_byte_data(client, | |
540 | ADM1025_REG_TEMP_LOW(i)); | |
541 | data->temp_max[i] = i2c_smbus_read_byte_data(client, | |
542 | ADM1025_REG_TEMP_HIGH(i)); | |
543 | } | |
544 | data->alarms = i2c_smbus_read_byte_data(client, | |
545 | ADM1025_REG_STATUS1) | |
546 | | (i2c_smbus_read_byte_data(client, | |
547 | ADM1025_REG_STATUS2) << 8); | |
548 | data->vid = (i2c_smbus_read_byte_data(client, | |
549 | ADM1025_REG_VID) & 0x0f) | |
550 | | ((i2c_smbus_read_byte_data(client, | |
551 | ADM1025_REG_VID4) & 0x01) << 4); | |
552 | ||
553 | data->last_updated = jiffies; | |
554 | data->valid = 1; | |
555 | } | |
556 | ||
557 | up(&data->update_lock); | |
558 | ||
559 | return data; | |
560 | } | |
561 | ||
562 | static int __init sensors_adm1025_init(void) | |
563 | { | |
564 | return i2c_add_driver(&adm1025_driver); | |
565 | } | |
566 | ||
567 | static void __exit sensors_adm1025_exit(void) | |
568 | { | |
569 | i2c_del_driver(&adm1025_driver); | |
570 | } | |
571 | ||
572 | MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>"); | |
573 | MODULE_DESCRIPTION("ADM1025 driver"); | |
574 | MODULE_LICENSE("GPL"); | |
575 | ||
576 | module_init(sensors_adm1025_init); | |
577 | module_exit(sensors_adm1025_exit); |