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[deliverable/linux.git] / drivers / hwmon / adm1021.c
1 /*
2 adm1021.c - Part of lm_sensors, Linux kernel modules for hardware
3 monitoring
4 Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> and
5 Philip Edelbrock <phil@netroedge.com>
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 */
21
22 #include <linux/module.h>
23 #include <linux/init.h>
24 #include <linux/slab.h>
25 #include <linux/jiffies.h>
26 #include <linux/i2c.h>
27 #include <linux/hwmon.h>
28 #include <linux/err.h>
29 #include <linux/mutex.h>
30
31
32 /* Addresses to scan */
33 static unsigned short normal_i2c[] = { 0x18, 0x19, 0x1a,
34 0x29, 0x2a, 0x2b,
35 0x4c, 0x4d, 0x4e,
36 I2C_CLIENT_END };
37
38 /* Insmod parameters */
39 I2C_CLIENT_INSMOD_8(adm1021, adm1023, max1617, max1617a, thmc10, lm84, gl523sm,
40 mc1066);
41
42 /* adm1021 constants specified below */
43
44 /* The adm1021 registers */
45 /* Read-only */
46 #define ADM1021_REG_TEMP 0x00
47 #define ADM1021_REG_REMOTE_TEMP 0x01
48 #define ADM1021_REG_STATUS 0x02
49 /* 0x41 = AD, 0x49 = TI, 0x4D = Maxim, 0x23 = Genesys , 0x54 = Onsemi */
50 #define ADM1021_REG_MAN_ID 0xFE
51 /* ADM1021 = 0x0X, ADM1023 = 0x3X */
52 #define ADM1021_REG_DEV_ID 0xFF
53 /* These use different addresses for reading/writing */
54 #define ADM1021_REG_CONFIG_R 0x03
55 #define ADM1021_REG_CONFIG_W 0x09
56 #define ADM1021_REG_CONV_RATE_R 0x04
57 #define ADM1021_REG_CONV_RATE_W 0x0A
58 /* These are for the ADM1023's additional precision on the remote temp sensor */
59 #define ADM1023_REG_REM_TEMP_PREC 0x10
60 #define ADM1023_REG_REM_OFFSET 0x11
61 #define ADM1023_REG_REM_OFFSET_PREC 0x12
62 #define ADM1023_REG_REM_TOS_PREC 0x13
63 #define ADM1023_REG_REM_THYST_PREC 0x14
64 /* limits */
65 #define ADM1021_REG_TOS_R 0x05
66 #define ADM1021_REG_TOS_W 0x0B
67 #define ADM1021_REG_REMOTE_TOS_R 0x07
68 #define ADM1021_REG_REMOTE_TOS_W 0x0D
69 #define ADM1021_REG_THYST_R 0x06
70 #define ADM1021_REG_THYST_W 0x0C
71 #define ADM1021_REG_REMOTE_THYST_R 0x08
72 #define ADM1021_REG_REMOTE_THYST_W 0x0E
73 /* write-only */
74 #define ADM1021_REG_ONESHOT 0x0F
75
76
77 /* Conversions. Rounding and limit checking is only done on the TO_REG
78 variants. Note that you should be a bit careful with which arguments
79 these macros are called: arguments may be evaluated more than once.
80 Fixing this is just not worth it. */
81 /* Conversions note: 1021 uses normal integer signed-byte format*/
82 #define TEMP_TO_REG(val) SENSORS_LIMIT((val) / 1000, -128, 127)
83
84 /* Initial values */
85
86 /* Note: Even though I left the low and high limits named os and hyst,
87 they don't quite work like a thermostat the way the LM75 does. I.e.,
88 a lower temp than THYST actually triggers an alarm instead of
89 clearing it. Weird, ey? --Phil */
90
91 /* Each client has this additional data */
92 struct adm1021_data {
93 struct i2c_client client;
94 struct class_device *class_dev;
95 enum chips type;
96
97 struct mutex update_lock;
98 char valid; /* !=0 if following fields are valid */
99 unsigned long last_updated; /* In jiffies */
100
101 s8 temp_max; /* Register values */
102 s8 temp_hyst;
103 s8 temp_input;
104 s8 remote_temp_max;
105 s8 remote_temp_hyst;
106 s8 remote_temp_input;
107 u8 alarms;
108 /* Special values for ADM1023 only */
109 u8 remote_temp_prec;
110 u8 remote_temp_os_prec;
111 u8 remote_temp_hyst_prec;
112 u8 remote_temp_offset;
113 u8 remote_temp_offset_prec;
114 };
115
116 static int adm1021_attach_adapter(struct i2c_adapter *adapter);
117 static int adm1021_detect(struct i2c_adapter *adapter, int address, int kind);
118 static void adm1021_init_client(struct i2c_client *client);
119 static int adm1021_detach_client(struct i2c_client *client);
120 static struct adm1021_data *adm1021_update_device(struct device *dev);
121
122 /* (amalysh) read only mode, otherwise any limit's writing confuse BIOS */
123 static int read_only;
124
125
126 /* This is the driver that will be inserted */
127 static struct i2c_driver adm1021_driver = {
128 .driver = {
129 .name = "adm1021",
130 },
131 .id = I2C_DRIVERID_ADM1021,
132 .attach_adapter = adm1021_attach_adapter,
133 .detach_client = adm1021_detach_client,
134 };
135
136 #define show(value) \
137 static ssize_t show_##value(struct device *dev, \
138 struct device_attribute *attr, char *buf) \
139 { \
140 struct adm1021_data *data = adm1021_update_device(dev); \
141 return sprintf(buf, "%d\n", 1000 * data->value); \
142 }
143 show(temp_max);
144 show(temp_hyst);
145 show(temp_input);
146 show(remote_temp_max);
147 show(remote_temp_hyst);
148 show(remote_temp_input);
149
150 static ssize_t show_alarms(struct device *dev,
151 struct device_attribute *attr,
152 char *buf)
153 {
154 struct adm1021_data *data = adm1021_update_device(dev);
155 return sprintf(buf, "%u\n", data->alarms);
156 }
157
158 #define set(value, reg) \
159 static ssize_t set_##value(struct device *dev, \
160 struct device_attribute *attr, \
161 const char *buf, size_t count) \
162 { \
163 struct i2c_client *client = to_i2c_client(dev); \
164 struct adm1021_data *data = i2c_get_clientdata(client); \
165 long temp = simple_strtol(buf, NULL, 10); \
166 \
167 mutex_lock(&data->update_lock); \
168 data->value = TEMP_TO_REG(temp); \
169 if (!read_only) \
170 i2c_smbus_write_byte_data(client, reg, data->value); \
171 mutex_unlock(&data->update_lock); \
172 return count; \
173 }
174 set(temp_max, ADM1021_REG_TOS_W);
175 set(temp_hyst, ADM1021_REG_THYST_W);
176 set(remote_temp_max, ADM1021_REG_REMOTE_TOS_W);
177 set(remote_temp_hyst, ADM1021_REG_REMOTE_THYST_W);
178
179 static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max, set_temp_max);
180 static DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp_hyst, set_temp_hyst);
181 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input, NULL);
182 static DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_remote_temp_max, set_remote_temp_max);
183 static DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_remote_temp_hyst, set_remote_temp_hyst);
184 static DEVICE_ATTR(temp2_input, S_IRUGO, show_remote_temp_input, NULL);
185 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
186
187
188 static int adm1021_attach_adapter(struct i2c_adapter *adapter)
189 {
190 if (!(adapter->class & I2C_CLASS_HWMON))
191 return 0;
192 return i2c_probe(adapter, &addr_data, adm1021_detect);
193 }
194
195 static struct attribute *adm1021_attributes[] = {
196 &dev_attr_temp1_max.attr,
197 &dev_attr_temp1_min.attr,
198 &dev_attr_temp1_input.attr,
199 &dev_attr_temp2_max.attr,
200 &dev_attr_temp2_min.attr,
201 &dev_attr_temp2_input.attr,
202 &dev_attr_alarms.attr,
203 NULL
204 };
205
206 static const struct attribute_group adm1021_group = {
207 .attrs = adm1021_attributes,
208 };
209
210 static int adm1021_detect(struct i2c_adapter *adapter, int address, int kind)
211 {
212 int i;
213 struct i2c_client *client;
214 struct adm1021_data *data;
215 int err = 0;
216 const char *type_name = "";
217 int conv_rate, status, config;
218
219 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
220 pr_debug("adm1021: detect failed, "
221 "smbus byte data not supported!\n");
222 goto error0;
223 }
224
225 /* OK. For now, we presume we have a valid client. We now create the
226 client structure, even though we cannot fill it completely yet.
227 But it allows us to access adm1021 register values. */
228
229 if (!(data = kzalloc(sizeof(struct adm1021_data), GFP_KERNEL))) {
230 pr_debug("adm1021: detect failed, kzalloc failed!\n");
231 err = -ENOMEM;
232 goto error0;
233 }
234
235 client = &data->client;
236 i2c_set_clientdata(client, data);
237 client->addr = address;
238 client->adapter = adapter;
239 client->driver = &adm1021_driver;
240 status = i2c_smbus_read_byte_data(client, ADM1021_REG_STATUS);
241 conv_rate = i2c_smbus_read_byte_data(client,
242 ADM1021_REG_CONV_RATE_R);
243 config = i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R);
244
245 /* Now, we do the remaining detection. */
246 if (kind < 0) {
247 if ((status & 0x03) != 0x00 || (config & 0x3F) != 0x00
248 || (conv_rate & 0xF8) != 0x00) {
249 pr_debug("adm1021: detect failed, "
250 "chip not detected!\n");
251 err = -ENODEV;
252 goto error1;
253 }
254 }
255
256 /* Determine the chip type. */
257 if (kind <= 0) {
258 i = i2c_smbus_read_byte_data(client, ADM1021_REG_MAN_ID);
259 if (i == 0x41)
260 if ((i2c_smbus_read_byte_data(client,
261 ADM1021_REG_DEV_ID) & 0xF0) == 0x30)
262 kind = adm1023;
263 else
264 kind = adm1021;
265 else if (i == 0x49)
266 kind = thmc10;
267 else if (i == 0x23)
268 kind = gl523sm;
269 else if ((i == 0x4d) &&
270 (i2c_smbus_read_byte_data(client,
271 ADM1021_REG_DEV_ID) == 0x01))
272 kind = max1617a;
273 else if (i == 0x54)
274 kind = mc1066;
275 /* LM84 Mfr ID in a different place, and it has more unused bits */
276 else if (conv_rate == 0x00
277 && (kind == 0 /* skip extra detection */
278 || ((config & 0x7F) == 0x00
279 && (status & 0xAB) == 0x00)))
280 kind = lm84;
281 else
282 kind = max1617;
283 }
284
285 if (kind == max1617) {
286 type_name = "max1617";
287 } else if (kind == max1617a) {
288 type_name = "max1617a";
289 } else if (kind == adm1021) {
290 type_name = "adm1021";
291 } else if (kind == adm1023) {
292 type_name = "adm1023";
293 } else if (kind == thmc10) {
294 type_name = "thmc10";
295 } else if (kind == lm84) {
296 type_name = "lm84";
297 } else if (kind == gl523sm) {
298 type_name = "gl523sm";
299 } else if (kind == mc1066) {
300 type_name = "mc1066";
301 }
302 pr_debug("adm1021: Detected chip %s at adapter %d, address 0x%02x.\n",
303 type_name, i2c_adapter_id(adapter), address);
304
305 /* Fill in the remaining client fields */
306 strlcpy(client->name, type_name, I2C_NAME_SIZE);
307 data->type = kind;
308 mutex_init(&data->update_lock);
309
310 /* Tell the I2C layer a new client has arrived */
311 if ((err = i2c_attach_client(client)))
312 goto error1;
313
314 /* Initialize the ADM1021 chip */
315 if (kind != lm84 && !read_only)
316 adm1021_init_client(client);
317
318 /* Register sysfs hooks */
319 if ((err = sysfs_create_group(&client->dev.kobj, &adm1021_group)))
320 goto error2;
321
322 data->class_dev = hwmon_device_register(&client->dev);
323 if (IS_ERR(data->class_dev)) {
324 err = PTR_ERR(data->class_dev);
325 goto error3;
326 }
327
328 return 0;
329
330 error3:
331 sysfs_remove_group(&client->dev.kobj, &adm1021_group);
332 error2:
333 i2c_detach_client(client);
334 error1:
335 kfree(data);
336 error0:
337 return err;
338 }
339
340 static void adm1021_init_client(struct i2c_client *client)
341 {
342 /* Enable ADC and disable suspend mode */
343 i2c_smbus_write_byte_data(client, ADM1021_REG_CONFIG_W,
344 i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R) & 0xBF);
345 /* Set Conversion rate to 1/sec (this can be tinkered with) */
346 i2c_smbus_write_byte_data(client, ADM1021_REG_CONV_RATE_W, 0x04);
347 }
348
349 static int adm1021_detach_client(struct i2c_client *client)
350 {
351 struct adm1021_data *data = i2c_get_clientdata(client);
352 int err;
353
354 hwmon_device_unregister(data->class_dev);
355 sysfs_remove_group(&client->dev.kobj, &adm1021_group);
356
357 if ((err = i2c_detach_client(client)))
358 return err;
359
360 kfree(data);
361 return 0;
362 }
363
364 static struct adm1021_data *adm1021_update_device(struct device *dev)
365 {
366 struct i2c_client *client = to_i2c_client(dev);
367 struct adm1021_data *data = i2c_get_clientdata(client);
368
369 mutex_lock(&data->update_lock);
370
371 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
372 || !data->valid) {
373 dev_dbg(&client->dev, "Starting adm1021 update\n");
374
375 data->temp_input = i2c_smbus_read_byte_data(client,
376 ADM1021_REG_TEMP);
377 data->temp_max = i2c_smbus_read_byte_data(client,
378 ADM1021_REG_TOS_R);
379 data->temp_hyst = i2c_smbus_read_byte_data(client,
380 ADM1021_REG_THYST_R);
381 data->remote_temp_input = i2c_smbus_read_byte_data(client,
382 ADM1021_REG_REMOTE_TEMP);
383 data->remote_temp_max = i2c_smbus_read_byte_data(client,
384 ADM1021_REG_REMOTE_TOS_R);
385 data->remote_temp_hyst = i2c_smbus_read_byte_data(client,
386 ADM1021_REG_REMOTE_THYST_R);
387 data->alarms = i2c_smbus_read_byte_data(client,
388 ADM1021_REG_STATUS) & 0x7c;
389 if (data->type == adm1023) {
390 data->remote_temp_prec =
391 i2c_smbus_read_byte_data(client,
392 ADM1023_REG_REM_TEMP_PREC);
393 data->remote_temp_os_prec =
394 i2c_smbus_read_byte_data(client,
395 ADM1023_REG_REM_TOS_PREC);
396 data->remote_temp_hyst_prec =
397 i2c_smbus_read_byte_data(client,
398 ADM1023_REG_REM_THYST_PREC);
399 data->remote_temp_offset =
400 i2c_smbus_read_byte_data(client,
401 ADM1023_REG_REM_OFFSET);
402 data->remote_temp_offset_prec =
403 i2c_smbus_read_byte_data(client,
404 ADM1023_REG_REM_OFFSET_PREC);
405 }
406 data->last_updated = jiffies;
407 data->valid = 1;
408 }
409
410 mutex_unlock(&data->update_lock);
411
412 return data;
413 }
414
415 static int __init sensors_adm1021_init(void)
416 {
417 return i2c_add_driver(&adm1021_driver);
418 }
419
420 static void __exit sensors_adm1021_exit(void)
421 {
422 i2c_del_driver(&adm1021_driver);
423 }
424
425 MODULE_AUTHOR ("Frodo Looijaard <frodol@dds.nl> and "
426 "Philip Edelbrock <phil@netroedge.com>");
427 MODULE_DESCRIPTION("adm1021 driver");
428 MODULE_LICENSE("GPL");
429
430 module_param(read_only, bool, 0);
431 MODULE_PARM_DESC(read_only, "Don't set any values, read only mode");
432
433 module_init(sensors_adm1021_init)
434 module_exit(sensors_adm1021_exit)
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