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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/i2c/chips/adm1025.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/i2c/chips/adm1025.c')
-rw-r--r--drivers/i2c/chips/adm1025.c574
1 files changed, 574 insertions, 0 deletions
diff --git a/drivers/i2c/chips/adm1025.c b/drivers/i2c/chips/adm1025.c
new file mode 100644
index 000000000000..e0771a3d05c9
--- /dev/null
+++ b/drivers/i2c/chips/adm1025.c
@@ -0,0 +1,574 @@
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
48#include <linux/config.h>
49#include <linux/module.h>
50#include <linux/init.h>
51#include <linux/slab.h>
52#include <linux/jiffies.h>
53#include <linux/i2c.h>
54#include <linux/i2c-sensor.h>
55#include <linux/i2c-vid.h>
56
57/*
58 * Addresses to scan
59 * ADM1025 and ADM1025A have three possible addresses: 0x2c, 0x2d and 0x2e.
60 * NE1619 has two possible addresses: 0x2c and 0x2d.
61 */
62
63static unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
64static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END };
65
66/*
67 * Insmod parameters
68 */
69
70SENSORS_INSMOD_2(adm1025, ne1619);
71
72/*
73 * The ADM1025 registers
74 */
75
76#define ADM1025_REG_MAN_ID 0x3E
77#define ADM1025_REG_CHIP_ID 0x3F
78#define ADM1025_REG_CONFIG 0x40
79#define ADM1025_REG_STATUS1 0x41
80#define ADM1025_REG_STATUS2 0x42
81#define ADM1025_REG_IN(nr) (0x20 + (nr))
82#define ADM1025_REG_IN_MAX(nr) (0x2B + (nr) * 2)
83#define ADM1025_REG_IN_MIN(nr) (0x2C + (nr) * 2)
84#define ADM1025_REG_TEMP(nr) (0x26 + (nr))
85#define ADM1025_REG_TEMP_HIGH(nr) (0x37 + (nr) * 2)
86#define ADM1025_REG_TEMP_LOW(nr) (0x38 + (nr) * 2)
87#define ADM1025_REG_VID 0x47
88#define ADM1025_REG_VID4 0x49
89
90/*
91 * Conversions and various macros
92 * The ADM1025 uses signed 8-bit values for temperatures.
93 */
94
95static int in_scale[6] = { 2500, 2250, 3300, 5000, 12000, 3300 };
96
97#define IN_FROM_REG(reg,scale) (((reg) * (scale) + 96) / 192)
98#define IN_TO_REG(val,scale) ((val) <= 0 ? 0 : \
99 (val) * 192 >= (scale) * 255 ? 255 : \
100 ((val) * 192 + (scale)/2) / (scale))
101
102#define TEMP_FROM_REG(reg) ((reg) * 1000)
103#define TEMP_TO_REG(val) ((val) <= -127500 ? -128 : \
104 (val) >= 126500 ? 127 : \
105 (((val) < 0 ? (val)-500 : (val)+500) / 1000))
106
107/*
108 * Functions declaration
109 */
110
111static int adm1025_attach_adapter(struct i2c_adapter *adapter);
112static int adm1025_detect(struct i2c_adapter *adapter, int address, int kind);
113static void adm1025_init_client(struct i2c_client *client);
114static int adm1025_detach_client(struct i2c_client *client);
115static struct adm1025_data *adm1025_update_device(struct device *dev);
116
117/*
118 * Driver data (common to all clients)
119 */
120
121static struct i2c_driver adm1025_driver = {
122 .owner = THIS_MODULE,
123 .name = "adm1025",
124 .id = I2C_DRIVERID_ADM1025,
125 .flags = I2C_DF_NOTIFY,
126 .attach_adapter = adm1025_attach_adapter,
127 .detach_client = adm1025_detach_client,
128};
129
130/*
131 * Client data (each client gets its own)
132 */
133
134struct adm1025_data {
135 struct i2c_client client;
136 struct semaphore update_lock;
137 char valid; /* zero until following fields are valid */
138 unsigned long last_updated; /* in jiffies */
139
140 u8 in[6]; /* register value */
141 u8 in_max[6]; /* register value */
142 u8 in_min[6]; /* register value */
143 s8 temp[2]; /* register value */
144 s8 temp_min[2]; /* register value */
145 s8 temp_max[2]; /* register value */
146 u16 alarms; /* register values, combined */
147 u8 vid; /* register values, combined */
148 u8 vrm;
149};
150
151/*
152 * Sysfs stuff
153 */
154
155#define show_in(offset) \
156static ssize_t show_in##offset(struct device *dev, char *buf) \
157{ \
158 struct adm1025_data *data = adm1025_update_device(dev); \
159 return sprintf(buf, "%u\n", IN_FROM_REG(data->in[offset], \
160 in_scale[offset])); \
161} \
162static ssize_t show_in##offset##_min(struct device *dev, char *buf) \
163{ \
164 struct adm1025_data *data = adm1025_update_device(dev); \
165 return sprintf(buf, "%u\n", IN_FROM_REG(data->in_min[offset], \
166 in_scale[offset])); \
167} \
168static ssize_t show_in##offset##_max(struct device *dev, char *buf) \
169{ \
170 struct adm1025_data *data = adm1025_update_device(dev); \
171 return sprintf(buf, "%u\n", IN_FROM_REG(data->in_max[offset], \
172 in_scale[offset])); \
173} \
174static DEVICE_ATTR(in##offset##_input, S_IRUGO, show_in##offset, NULL);
175show_in(0);
176show_in(1);
177show_in(2);
178show_in(3);
179show_in(4);
180show_in(5);
181
182#define show_temp(offset) \
183static ssize_t show_temp##offset(struct device *dev, char *buf) \
184{ \
185 struct adm1025_data *data = adm1025_update_device(dev); \
186 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[offset-1])); \
187} \
188static ssize_t show_temp##offset##_min(struct device *dev, char *buf) \
189{ \
190 struct adm1025_data *data = adm1025_update_device(dev); \
191 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_min[offset-1])); \
192} \
193static ssize_t show_temp##offset##_max(struct device *dev, char *buf) \
194{ \
195 struct adm1025_data *data = adm1025_update_device(dev); \
196 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[offset-1])); \
197}\
198static DEVICE_ATTR(temp##offset##_input, S_IRUGO, show_temp##offset, NULL);
199show_temp(1);
200show_temp(2);
201
202#define set_in(offset) \
203static ssize_t set_in##offset##_min(struct device *dev, const char *buf, \
204 size_t count) \
205{ \
206 struct i2c_client *client = to_i2c_client(dev); \
207 struct adm1025_data *data = i2c_get_clientdata(client); \
208 long val = simple_strtol(buf, NULL, 10); \
209 \
210 down(&data->update_lock); \
211 data->in_min[offset] = IN_TO_REG(val, in_scale[offset]); \
212 i2c_smbus_write_byte_data(client, ADM1025_REG_IN_MIN(offset), \
213 data->in_min[offset]); \
214 up(&data->update_lock); \
215 return count; \
216} \
217static ssize_t set_in##offset##_max(struct device *dev, const char *buf, \
218 size_t count) \
219{ \
220 struct i2c_client *client = to_i2c_client(dev); \
221 struct adm1025_data *data = i2c_get_clientdata(client); \
222 long val = simple_strtol(buf, NULL, 10); \
223 \
224 down(&data->update_lock); \
225 data->in_max[offset] = IN_TO_REG(val, in_scale[offset]); \
226 i2c_smbus_write_byte_data(client, ADM1025_REG_IN_MAX(offset), \
227 data->in_max[offset]); \
228 up(&data->update_lock); \
229 return count; \
230} \
231static DEVICE_ATTR(in##offset##_min, S_IWUSR | S_IRUGO, \
232 show_in##offset##_min, set_in##offset##_min); \
233static DEVICE_ATTR(in##offset##_max, S_IWUSR | S_IRUGO, \
234 show_in##offset##_max, set_in##offset##_max);
235set_in(0);
236set_in(1);
237set_in(2);
238set_in(3);
239set_in(4);
240set_in(5);
241
242#define set_temp(offset) \
243static ssize_t set_temp##offset##_min(struct device *dev, const char *buf, \
244 size_t count) \
245{ \
246 struct i2c_client *client = to_i2c_client(dev); \
247 struct adm1025_data *data = i2c_get_clientdata(client); \
248 long val = simple_strtol(buf, NULL, 10); \
249 \
250 down(&data->update_lock); \
251 data->temp_min[offset-1] = TEMP_TO_REG(val); \
252 i2c_smbus_write_byte_data(client, ADM1025_REG_TEMP_LOW(offset-1), \
253 data->temp_min[offset-1]); \
254 up(&data->update_lock); \
255 return count; \
256} \
257static ssize_t set_temp##offset##_max(struct device *dev, const char *buf, \
258 size_t count) \
259{ \
260 struct i2c_client *client = to_i2c_client(dev); \
261 struct adm1025_data *data = i2c_get_clientdata(client); \
262 long val = simple_strtol(buf, NULL, 10); \
263 \
264 down(&data->update_lock); \
265 data->temp_max[offset-1] = TEMP_TO_REG(val); \
266 i2c_smbus_write_byte_data(client, ADM1025_REG_TEMP_HIGH(offset-1), \
267 data->temp_max[offset-1]); \
268 up(&data->update_lock); \
269 return count; \
270} \
271static DEVICE_ATTR(temp##offset##_min, S_IWUSR | S_IRUGO, \
272 show_temp##offset##_min, set_temp##offset##_min); \
273static DEVICE_ATTR(temp##offset##_max, S_IWUSR | S_IRUGO, \
274 show_temp##offset##_max, set_temp##offset##_max);
275set_temp(1);
276set_temp(2);
277
278static ssize_t show_alarms(struct device *dev, char *buf)
279{
280 struct adm1025_data *data = adm1025_update_device(dev);
281 return sprintf(buf, "%u\n", data->alarms);
282}
283static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
284
285static ssize_t show_vid(struct device *dev, char *buf)
286{
287 struct adm1025_data *data = adm1025_update_device(dev);
288 return sprintf(buf, "%u\n", vid_from_reg(data->vid, data->vrm));
289}
290static DEVICE_ATTR(in1_ref, S_IRUGO, show_vid, NULL);
291
292static ssize_t show_vrm(struct device *dev, char *buf)
293{
294 struct adm1025_data *data = adm1025_update_device(dev);
295 return sprintf(buf, "%u\n", data->vrm);
296}
297static ssize_t set_vrm(struct device *dev, const char *buf, size_t count)
298{
299 struct i2c_client *client = to_i2c_client(dev);
300 struct adm1025_data *data = i2c_get_clientdata(client);
301 data->vrm = simple_strtoul(buf, NULL, 10);
302 return count;
303}
304static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm);
305
306/*
307 * Real code
308 */
309
310static int adm1025_attach_adapter(struct i2c_adapter *adapter)
311{
312 if (!(adapter->class & I2C_CLASS_HWMON))
313 return 0;
314 return i2c_detect(adapter, &addr_data, adm1025_detect);
315}
316
317/*
318 * The following function does more than just detection. If detection
319 * succeeds, it also registers the new chip.
320 */
321static int adm1025_detect(struct i2c_adapter *adapter, int address, int kind)
322{
323 struct i2c_client *new_client;
324 struct adm1025_data *data;
325 int err = 0;
326 const char *name = "";
327 u8 config;
328
329 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
330 goto exit;
331
332 if (!(data = kmalloc(sizeof(struct adm1025_data), GFP_KERNEL))) {
333 err = -ENOMEM;
334 goto exit;
335 }
336 memset(data, 0, sizeof(struct adm1025_data));
337
338 /* The common I2C client data is placed right before the
339 ADM1025-specific data. */
340 new_client = &data->client;
341 i2c_set_clientdata(new_client, data);
342 new_client->addr = address;
343 new_client->adapter = adapter;
344 new_client->driver = &adm1025_driver;
345 new_client->flags = 0;
346
347 /*
348 * Now we do the remaining detection. A negative kind means that
349 * the driver was loaded with no force parameter (default), so we
350 * must both detect and identify the chip. A zero kind means that
351 * the driver was loaded with the force parameter, the detection
352 * step shall be skipped. A positive kind means that the driver
353 * was loaded with the force parameter and a given kind of chip is
354 * requested, so both the detection and the identification steps
355 * are skipped.
356 */
357 config = i2c_smbus_read_byte_data(new_client, ADM1025_REG_CONFIG);
358 if (kind < 0) { /* detection */
359 if ((config & 0x80) != 0x00
360 || (i2c_smbus_read_byte_data(new_client,
361 ADM1025_REG_STATUS1) & 0xC0) != 0x00
362 || (i2c_smbus_read_byte_data(new_client,
363 ADM1025_REG_STATUS2) & 0xBC) != 0x00) {
364 dev_dbg(&adapter->dev,
365 "ADM1025 detection failed at 0x%02x.\n",
366 address);
367 goto exit_free;
368 }
369 }
370
371 if (kind <= 0) { /* identification */
372 u8 man_id, chip_id;
373
374 man_id = i2c_smbus_read_byte_data(new_client,
375 ADM1025_REG_MAN_ID);
376 chip_id = i2c_smbus_read_byte_data(new_client,
377 ADM1025_REG_CHIP_ID);
378
379 if (man_id == 0x41) { /* Analog Devices */
380 if ((chip_id & 0xF0) == 0x20) { /* ADM1025/ADM1025A */
381 kind = adm1025;
382 }
383 } else
384 if (man_id == 0xA1) { /* Philips */
385 if (address != 0x2E
386 && (chip_id & 0xF0) == 0x20) { /* NE1619 */
387 kind = ne1619;
388 }
389 }
390
391 if (kind <= 0) { /* identification failed */
392 dev_info(&adapter->dev,
393 "Unsupported chip (man_id=0x%02X, "
394 "chip_id=0x%02X).\n", man_id, chip_id);
395 goto exit_free;
396 }
397 }
398
399 if (kind == adm1025) {
400 name = "adm1025";
401 } else if (kind == ne1619) {
402 name = "ne1619";
403 }
404
405 /* We can fill in the remaining client fields */
406 strlcpy(new_client->name, name, I2C_NAME_SIZE);
407 data->valid = 0;
408 init_MUTEX(&data->update_lock);
409
410 /* Tell the I2C layer a new client has arrived */
411 if ((err = i2c_attach_client(new_client)))
412 goto exit_free;
413
414 /* Initialize the ADM1025 chip */
415 adm1025_init_client(new_client);
416
417 /* Register sysfs hooks */
418 device_create_file(&new_client->dev, &dev_attr_in0_input);
419 device_create_file(&new_client->dev, &dev_attr_in1_input);
420 device_create_file(&new_client->dev, &dev_attr_in2_input);
421 device_create_file(&new_client->dev, &dev_attr_in3_input);
422 device_create_file(&new_client->dev, &dev_attr_in5_input);
423 device_create_file(&new_client->dev, &dev_attr_in0_min);
424 device_create_file(&new_client->dev, &dev_attr_in1_min);
425 device_create_file(&new_client->dev, &dev_attr_in2_min);
426 device_create_file(&new_client->dev, &dev_attr_in3_min);
427 device_create_file(&new_client->dev, &dev_attr_in5_min);
428 device_create_file(&new_client->dev, &dev_attr_in0_max);
429 device_create_file(&new_client->dev, &dev_attr_in1_max);
430 device_create_file(&new_client->dev, &dev_attr_in2_max);
431 device_create_file(&new_client->dev, &dev_attr_in3_max);
432 device_create_file(&new_client->dev, &dev_attr_in5_max);
433 device_create_file(&new_client->dev, &dev_attr_temp1_input);
434 device_create_file(&new_client->dev, &dev_attr_temp2_input);
435 device_create_file(&new_client->dev, &dev_attr_temp1_min);
436 device_create_file(&new_client->dev, &dev_attr_temp2_min);
437 device_create_file(&new_client->dev, &dev_attr_temp1_max);
438 device_create_file(&new_client->dev, &dev_attr_temp2_max);
439 device_create_file(&new_client->dev, &dev_attr_alarms);
440 device_create_file(&new_client->dev, &dev_attr_in1_ref);
441 device_create_file(&new_client->dev, &dev_attr_vrm);
442
443 /* Pin 11 is either in4 (+12V) or VID4 */
444 if (!(config & 0x20)) {
445 device_create_file(&new_client->dev, &dev_attr_in4_input);
446 device_create_file(&new_client->dev, &dev_attr_in4_min);
447 device_create_file(&new_client->dev, &dev_attr_in4_max);
448 }
449
450 return 0;
451
452exit_free:
453 kfree(data);
454exit:
455 return err;
456}
457
458static void adm1025_init_client(struct i2c_client *client)
459{
460 u8 reg;
461 struct adm1025_data *data = i2c_get_clientdata(client);
462 int i;
463
464 data->vrm = i2c_which_vrm();
465
466 /*
467 * Set high limits
468 * Usually we avoid setting limits on driver init, but it happens
469 * that the ADM1025 comes with stupid default limits (all registers
470 * set to 0). In case the chip has not gone through any limit
471 * setting yet, we better set the high limits to the max so that
472 * no alarm triggers.
473 */
474 for (i=0; i<6; i++) {
475 reg = i2c_smbus_read_byte_data(client,
476 ADM1025_REG_IN_MAX(i));
477 if (reg == 0)
478 i2c_smbus_write_byte_data(client,
479 ADM1025_REG_IN_MAX(i),
480 0xFF);
481 }
482 for (i=0; i<2; i++) {
483 reg = i2c_smbus_read_byte_data(client,
484 ADM1025_REG_TEMP_HIGH(i));
485 if (reg == 0)
486 i2c_smbus_write_byte_data(client,
487 ADM1025_REG_TEMP_HIGH(i),
488 0x7F);
489 }
490
491 /*
492 * Start the conversions
493 */
494 reg = i2c_smbus_read_byte_data(client, ADM1025_REG_CONFIG);
495 if (!(reg & 0x01))
496 i2c_smbus_write_byte_data(client, ADM1025_REG_CONFIG,
497 (reg&0x7E)|0x01);
498}
499
500static int adm1025_detach_client(struct i2c_client *client)
501{
502 int err;
503
504 if ((err = i2c_detach_client(client))) {
505 dev_err(&client->dev, "Client deregistration failed, "
506 "client not detached.\n");
507 return err;
508 }
509
510 kfree(i2c_get_clientdata(client));
511 return 0;
512}
513
514static struct adm1025_data *adm1025_update_device(struct device *dev)
515{
516 struct i2c_client *client = to_i2c_client(dev);
517 struct adm1025_data *data = i2c_get_clientdata(client);
518
519 down(&data->update_lock);
520
521 if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
522 int i;
523
524 dev_dbg(&client->dev, "Updating data.\n");
525 for (i=0; i<6; i++) {
526 data->in[i] = i2c_smbus_read_byte_data(client,
527 ADM1025_REG_IN(i));
528 data->in_min[i] = i2c_smbus_read_byte_data(client,
529 ADM1025_REG_IN_MIN(i));
530 data->in_max[i] = i2c_smbus_read_byte_data(client,
531 ADM1025_REG_IN_MAX(i));
532 }
533 for (i=0; i<2; i++) {
534 data->temp[i] = i2c_smbus_read_byte_data(client,
535 ADM1025_REG_TEMP(i));
536 data->temp_min[i] = i2c_smbus_read_byte_data(client,
537 ADM1025_REG_TEMP_LOW(i));
538 data->temp_max[i] = i2c_smbus_read_byte_data(client,
539 ADM1025_REG_TEMP_HIGH(i));
540 }
541 data->alarms = i2c_smbus_read_byte_data(client,
542 ADM1025_REG_STATUS1)
543 | (i2c_smbus_read_byte_data(client,
544 ADM1025_REG_STATUS2) << 8);
545 data->vid = (i2c_smbus_read_byte_data(client,
546 ADM1025_REG_VID) & 0x0f)
547 | ((i2c_smbus_read_byte_data(client,
548 ADM1025_REG_VID4) & 0x01) << 4);
549
550 data->last_updated = jiffies;
551 data->valid = 1;
552 }
553
554 up(&data->update_lock);
555
556 return data;
557}
558
559static int __init sensors_adm1025_init(void)
560{
561 return i2c_add_driver(&adm1025_driver);
562}
563
564static void __exit sensors_adm1025_exit(void)
565{
566 i2c_del_driver(&adm1025_driver);
567}
568
569MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
570MODULE_DESCRIPTION("ADM1025 driver");
571MODULE_LICENSE("GPL");
572
573module_init(sensors_adm1025_init);
574module_exit(sensors_adm1025_exit);