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authorKrzysztof Helt <krzysztof.h1@wp.pl>2007-07-08 16:43:00 -0400
committerMark M. Hoffman <mhoffman@lightlink.com>2007-07-30 21:02:59 -0400
commitadd77c64ca8b00dae5dc0a6be9eb89f1514d21ea (patch)
tree91f998c9c203d877cce43cf0c08d05848d624973 /drivers/hwmon/thmc50.c
parent80ba80a9bf25d251237694c3fcee850a73324532 (diff)
hwmon: add support for THMC50 and ADM1022
This patch adds support for THMC50 and ADM1022 hardware monitoring chips. Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl> Acked-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com>
Diffstat (limited to 'drivers/hwmon/thmc50.c')
-rw-r--r--drivers/hwmon/thmc50.c440
1 files changed, 440 insertions, 0 deletions
diff --git a/drivers/hwmon/thmc50.c b/drivers/hwmon/thmc50.c
new file mode 100644
index 000000000000..9395b52d9b99
--- /dev/null
+++ b/drivers/hwmon/thmc50.c
@@ -0,0 +1,440 @@
1/*
2 thmc50.c - Part of lm_sensors, Linux kernel modules for hardware
3 monitoring
4 Copyright (C) 2007 Krzysztof Helt <krzysztof.h1@wp.pl>
5 Based on 2.4 driver by Frodo Looijaard <frodol@dds.nl> and
6 Philip Edelbrock <phil@netroedge.com>
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21*/
22
23#include <linux/module.h>
24#include <linux/init.h>
25#include <linux/slab.h>
26#include <linux/i2c.h>
27#include <linux/hwmon.h>
28#include <linux/hwmon-sysfs.h>
29#include <linux/err.h>
30#include <linux/mutex.h>
31
32MODULE_LICENSE("GPL");
33
34/* Addresses to scan */
35static unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
36
37/* Insmod parameters */
38I2C_CLIENT_INSMOD_2(thmc50, adm1022);
39I2C_CLIENT_MODULE_PARM(adm1022_temp3, "List of adapter,address pairs "
40 "to enable 3rd temperature (ADM1022 only)");
41
42/* Many THMC50 constants specified below */
43
44/* The THMC50 registers */
45#define THMC50_REG_CONF 0x40
46#define THMC50_REG_COMPANY_ID 0x3E
47#define THMC50_REG_DIE_CODE 0x3F
48#define THMC50_REG_ANALOG_OUT 0x19
49
50const static u8 THMC50_REG_TEMP[] = { 0x27, 0x26, 0x20 };
51const static u8 THMC50_REG_TEMP_MIN[] = { 0x3A, 0x38, 0x2C };
52const static u8 THMC50_REG_TEMP_MAX[] = { 0x39, 0x37, 0x2B };
53
54#define THMC50_REG_CONF_nFANOFF 0x20
55
56/* Each client has this additional data */
57struct thmc50_data {
58 struct i2c_client client;
59 struct class_device *class_dev;
60
61 struct mutex update_lock;
62 enum chips type;
63 unsigned long last_updated; /* In jiffies */
64 char has_temp3; /* !=0 if it is ADM1022 in temp3 mode */
65 char valid; /* !=0 if following fields are valid */
66
67 /* Register values */
68 s8 temp_input[3];
69 s8 temp_max[3];
70 s8 temp_min[3];
71 u8 analog_out;
72};
73
74static int thmc50_attach_adapter(struct i2c_adapter *adapter);
75static int thmc50_detach_client(struct i2c_client *client);
76static void thmc50_init_client(struct i2c_client *client);
77static struct thmc50_data *thmc50_update_device(struct device *dev);
78
79static struct i2c_driver thmc50_driver = {
80 .driver = {
81 .name = "thmc50",
82 },
83 .attach_adapter = thmc50_attach_adapter,
84 .detach_client = thmc50_detach_client,
85};
86
87static ssize_t show_analog_out(struct device *dev,
88 struct device_attribute *attr, char *buf)
89{
90 struct thmc50_data *data = thmc50_update_device(dev);
91 return sprintf(buf, "%d\n", data->analog_out);
92}
93
94static ssize_t set_analog_out(struct device *dev,
95 struct device_attribute *attr,
96 const char *buf, size_t count)
97{
98 struct i2c_client *client = to_i2c_client(dev);
99 struct thmc50_data *data = i2c_get_clientdata(client);
100 int tmp = simple_strtoul(buf, NULL, 10);
101 int config;
102
103 mutex_lock(&data->update_lock);
104 data->analog_out = SENSORS_LIMIT(tmp, 0, 255);
105 i2c_smbus_write_byte_data(client, THMC50_REG_ANALOG_OUT,
106 data->analog_out);
107
108 config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF);
109 if (data->analog_out == 0)
110 config &= ~THMC50_REG_CONF_nFANOFF;
111 else
112 config |= THMC50_REG_CONF_nFANOFF;
113 i2c_smbus_write_byte_data(client, THMC50_REG_CONF, config);
114
115 mutex_unlock(&data->update_lock);
116 return count;
117}
118
119/* There is only one PWM mode = DC */
120static ssize_t show_pwm_mode(struct device *dev, struct device_attribute *attr,
121 char *buf)
122{
123 return sprintf(buf, "0\n");
124}
125
126/* Temperatures */
127static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
128 char *buf)
129{
130 int nr = to_sensor_dev_attr(attr)->index;
131 struct thmc50_data *data = thmc50_update_device(dev);
132 return sprintf(buf, "%d\n", data->temp_input[nr] * 1000);
133}
134
135static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr,
136 char *buf)
137{
138 int nr = to_sensor_dev_attr(attr)->index;
139 struct thmc50_data *data = thmc50_update_device(dev);
140 return sprintf(buf, "%d\n", data->temp_min[nr] * 1000);
141}
142
143static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
144 const char *buf, size_t count)
145{
146 int nr = to_sensor_dev_attr(attr)->index;
147 struct i2c_client *client = to_i2c_client(dev);
148 struct thmc50_data *data = i2c_get_clientdata(client);
149 int val = simple_strtol(buf, NULL, 10);
150
151 mutex_lock(&data->update_lock);
152 data->temp_min[nr] = SENSORS_LIMIT(val / 1000, -128, 127);
153 i2c_smbus_write_byte_data(client, THMC50_REG_TEMP_MIN[nr],
154 data->temp_min[nr]);
155 mutex_unlock(&data->update_lock);
156 return count;
157}
158
159static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
160 char *buf)
161{
162 int nr = to_sensor_dev_attr(attr)->index;
163 struct thmc50_data *data = thmc50_update_device(dev);
164 return sprintf(buf, "%d\n", data->temp_max[nr] * 1000);
165}
166
167static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
168 const char *buf, size_t count)
169{
170 int nr = to_sensor_dev_attr(attr)->index;
171 struct i2c_client *client = to_i2c_client(dev);
172 struct thmc50_data *data = i2c_get_clientdata(client);
173 int val = simple_strtol(buf, NULL, 10);
174
175 mutex_lock(&data->update_lock);
176 data->temp_max[nr] = SENSORS_LIMIT(val / 1000, -128, 127);
177 i2c_smbus_write_byte_data(client, THMC50_REG_TEMP_MAX[nr],
178 data->temp_max[nr]);
179 mutex_unlock(&data->update_lock);
180 return count;
181}
182
183#define temp_reg(offset) \
184static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO, show_temp, \
185 NULL, offset - 1); \
186static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR, \
187 show_temp_min, set_temp_min, offset - 1); \
188static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR, \
189 show_temp_max, set_temp_max, offset - 1);
190
191temp_reg(1);
192temp_reg(2);
193temp_reg(3);
194
195static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_analog_out,
196 set_analog_out, 0);
197static SENSOR_DEVICE_ATTR(pwm1_mode, S_IRUGO, show_pwm_mode, NULL, 0);
198
199static struct attribute *thmc50_attributes[] = {
200 &sensor_dev_attr_temp1_max.dev_attr.attr,
201 &sensor_dev_attr_temp1_min.dev_attr.attr,
202 &sensor_dev_attr_temp1_input.dev_attr.attr,
203 &sensor_dev_attr_temp2_max.dev_attr.attr,
204 &sensor_dev_attr_temp2_min.dev_attr.attr,
205 &sensor_dev_attr_temp2_input.dev_attr.attr,
206 &sensor_dev_attr_pwm1.dev_attr.attr,
207 &sensor_dev_attr_pwm1_mode.dev_attr.attr,
208 NULL
209};
210
211static const struct attribute_group thmc50_group = {
212 .attrs = thmc50_attributes,
213};
214
215/* for ADM1022 3rd temperature mode */
216static struct attribute *adm1022_attributes[] = {
217 &sensor_dev_attr_temp3_max.dev_attr.attr,
218 &sensor_dev_attr_temp3_min.dev_attr.attr,
219 &sensor_dev_attr_temp3_input.dev_attr.attr,
220 NULL
221};
222
223static const struct attribute_group adm1022_group = {
224 .attrs = adm1022_attributes,
225};
226
227static int thmc50_detect(struct i2c_adapter *adapter, int address, int kind)
228{
229 unsigned company;
230 unsigned revision;
231 unsigned config;
232 struct i2c_client *client;
233 struct thmc50_data *data;
234 struct device *dev;
235 int err = 0;
236 const char *type_name = "";
237
238 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
239 pr_debug("thmc50: detect failed, "
240 "smbus byte data not supported!\n");
241 goto exit;
242 }
243
244 /* OK. For now, we presume we have a valid client. We now create the
245 client structure, even though we cannot fill it completely yet.
246 But it allows us to access thmc50 registers. */
247 if (!(data = kzalloc(sizeof(struct thmc50_data), GFP_KERNEL))) {
248 pr_debug("thmc50: detect failed, kzalloc failed!\n");
249 err = -ENOMEM;
250 goto exit;
251 }
252
253 client = &data->client;
254 i2c_set_clientdata(client, data);
255 client->addr = address;
256 client->adapter = adapter;
257 client->driver = &thmc50_driver;
258 dev = &client->dev;
259
260 pr_debug("thmc50: Probing for THMC50 at 0x%2X on bus %d\n",
261 client->addr, i2c_adapter_id(client->adapter));
262
263 /* Now, we do the remaining detection. */
264 company = i2c_smbus_read_byte_data(client, THMC50_REG_COMPANY_ID);
265 revision = i2c_smbus_read_byte_data(client, THMC50_REG_DIE_CODE);
266 config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF);
267
268 if (kind == 0)
269 kind = thmc50;
270 else if (kind < 0) {
271 err = -ENODEV;
272 if (revision >= 0xc0 && ((config & 0x10) == 0)) {
273 if (company == 0x49) {
274 kind = thmc50;
275 err = 0;
276 } else if (company == 0x41) {
277 kind = adm1022;
278 err = 0;
279 }
280 }
281 }
282 if (err == -ENODEV) {
283 pr_debug("thmc50: Detection of THMC50/ADM1022 failed\n");
284 goto exit_free;
285 }
286 pr_debug("thmc50: Detected %s (version %x, revision %x)\n",
287 type_name, (revision >> 4) - 0xc, revision & 0xf);
288 data->type = kind;
289
290 if (kind == thmc50)
291 type_name = "thmc50";
292 else if (kind == adm1022) {
293 int id = i2c_adapter_id(client->adapter);
294 int i;
295
296 type_name = "adm1022";
297 data->has_temp3 = (config >> 7) & 1; /* config MSB */
298 for (i = 0; i + 1 < adm1022_temp3_num; i += 2)
299 if (adm1022_temp3[i] == id &&
300 adm1022_temp3[i + 1] == address) {
301 /* enable 2nd remote temp */
302 data->has_temp3 = 1;
303 break;
304 }
305 }
306
307 /* Fill in the remaining client fields & put it into the global list */
308 strlcpy(client->name, type_name, I2C_NAME_SIZE);
309 mutex_init(&data->update_lock);
310
311 /* Tell the I2C layer a new client has arrived */
312 if ((err = i2c_attach_client(client)))
313 goto exit_free;
314
315 thmc50_init_client(client);
316
317 /* Register sysfs hooks */
318 if ((err = sysfs_create_group(&client->dev.kobj, &thmc50_group)))
319 goto exit_detach;
320
321 /* Register ADM1022 sysfs hooks */
322 if (data->type == adm1022)
323 if ((err = sysfs_create_group(&client->dev.kobj,
324 &adm1022_group)))
325 goto exit_remove_sysfs_thmc50;
326
327 /* Register a new directory entry with module sensors */
328 data->class_dev = hwmon_device_register(&client->dev);
329 if (IS_ERR(data->class_dev)) {
330 err = PTR_ERR(data->class_dev);
331 goto exit_remove_sysfs;
332 }
333
334 return 0;
335
336exit_remove_sysfs:
337 if (data->type == adm1022)
338 sysfs_remove_group(&client->dev.kobj, &adm1022_group);
339exit_remove_sysfs_thmc50:
340 sysfs_remove_group(&client->dev.kobj, &thmc50_group);
341exit_detach:
342 i2c_detach_client(client);
343exit_free:
344 kfree(data);
345exit:
346 return err;
347}
348
349static int thmc50_attach_adapter(struct i2c_adapter *adapter)
350{
351 if (!(adapter->class & I2C_CLASS_HWMON))
352 return 0;
353 return i2c_probe(adapter, &addr_data, thmc50_detect);
354}
355
356static int thmc50_detach_client(struct i2c_client *client)
357{
358 struct thmc50_data *data = i2c_get_clientdata(client);
359 int err;
360
361 hwmon_device_unregister(data->class_dev);
362 sysfs_remove_group(&client->dev.kobj, &thmc50_group);
363 if (data->type == adm1022)
364 sysfs_remove_group(&client->dev.kobj, &adm1022_group);
365
366 if ((err = i2c_detach_client(client)))
367 return err;
368
369 kfree(data);
370
371 return 0;
372}
373
374static void thmc50_init_client(struct i2c_client *client)
375{
376 struct thmc50_data *data = i2c_get_clientdata(client);
377 int config;
378
379 data->analog_out = i2c_smbus_read_byte_data(client,
380 THMC50_REG_ANALOG_OUT);
381 /* set up to at least 1 */
382 if (data->analog_out == 0) {
383 data->analog_out = 1;
384 i2c_smbus_write_byte_data(client, THMC50_REG_ANALOG_OUT,
385 data->analog_out);
386 }
387 config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF);
388 config |= 0x1; /* start the chip if it is in standby mode */
389 if (data->has_temp3)
390 config |= 0x80; /* enable 2nd remote temp */
391 i2c_smbus_write_byte_data(client, THMC50_REG_CONF, config);
392}
393
394static struct thmc50_data *thmc50_update_device(struct device *dev)
395{
396 struct i2c_client *client = to_i2c_client(dev);
397 struct thmc50_data *data = i2c_get_clientdata(client);
398 int timeout = HZ / 5 + (data->type == thmc50 ? HZ : 0);
399
400 mutex_lock(&data->update_lock);
401
402 if (time_after(jiffies, data->last_updated + timeout)
403 || !data->valid) {
404
405 int temps = data->has_temp3 ? 3 : 2;
406 int i;
407 for (i = 0; i < temps; i++) {
408 data->temp_input[i] = i2c_smbus_read_byte_data(client,
409 THMC50_REG_TEMP[i]);
410 data->temp_max[i] = i2c_smbus_read_byte_data(client,
411 THMC50_REG_TEMP_MAX[i]);
412 data->temp_min[i] = i2c_smbus_read_byte_data(client,
413 THMC50_REG_TEMP_MIN[i]);
414 }
415 data->analog_out =
416 i2c_smbus_read_byte_data(client, THMC50_REG_ANALOG_OUT);
417 data->last_updated = jiffies;
418 data->valid = 1;
419 }
420
421 mutex_unlock(&data->update_lock);
422
423 return data;
424}
425
426static int __init sm_thmc50_init(void)
427{
428 return i2c_add_driver(&thmc50_driver);
429}
430
431static void __exit sm_thmc50_exit(void)
432{
433 i2c_del_driver(&thmc50_driver);
434}
435
436MODULE_AUTHOR("Krzysztof Helt <krzysztof.h1@wp.pl>");
437MODULE_DESCRIPTION("THMC50 driver");
438
439module_init(sm_thmc50_init);
440module_exit(sm_thmc50_exit);