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-rw-r--r--drivers/hwmon/adm1021.c402
1 files changed, 402 insertions, 0 deletions
diff --git a/drivers/hwmon/adm1021.c b/drivers/hwmon/adm1021.c
new file mode 100644
index 000000000000..d2c774c32f45
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+++ b/drivers/hwmon/adm1021.c
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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/i2c-sensor.h>
28
29
30/* Addresses to scan */
31static unsigned short normal_i2c[] = { 0x18, 0x19, 0x1a,
32 0x29, 0x2a, 0x2b,
33 0x4c, 0x4d, 0x4e,
34 I2C_CLIENT_END };
35static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END };
36
37/* Insmod parameters */
38SENSORS_INSMOD_8(adm1021, adm1023, max1617, max1617a, thmc10, lm84, gl523sm, mc1066);
39
40/* adm1021 constants specified below */
41
42/* The adm1021 registers */
43/* Read-only */
44#define ADM1021_REG_TEMP 0x00
45#define ADM1021_REG_REMOTE_TEMP 0x01
46#define ADM1021_REG_STATUS 0x02
47#define ADM1021_REG_MAN_ID 0x0FE /* 0x41 = AMD, 0x49 = TI, 0x4D = Maxim, 0x23 = Genesys , 0x54 = Onsemi*/
48#define ADM1021_REG_DEV_ID 0x0FF /* ADM1021 = 0x0X, ADM1023 = 0x3X */
49#define ADM1021_REG_DIE_CODE 0x0FF /* MAX1617A */
50/* These use different addresses for reading/writing */
51#define ADM1021_REG_CONFIG_R 0x03
52#define ADM1021_REG_CONFIG_W 0x09
53#define ADM1021_REG_CONV_RATE_R 0x04
54#define ADM1021_REG_CONV_RATE_W 0x0A
55/* These are for the ADM1023's additional precision on the remote temp sensor */
56#define ADM1021_REG_REM_TEMP_PREC 0x010
57#define ADM1021_REG_REM_OFFSET 0x011
58#define ADM1021_REG_REM_OFFSET_PREC 0x012
59#define ADM1021_REG_REM_TOS_PREC 0x013
60#define ADM1021_REG_REM_THYST_PREC 0x014
61/* limits */
62#define ADM1021_REG_TOS_R 0x05
63#define ADM1021_REG_TOS_W 0x0B
64#define ADM1021_REG_REMOTE_TOS_R 0x07
65#define ADM1021_REG_REMOTE_TOS_W 0x0D
66#define ADM1021_REG_THYST_R 0x06
67#define ADM1021_REG_THYST_W 0x0C
68#define ADM1021_REG_REMOTE_THYST_R 0x08
69#define ADM1021_REG_REMOTE_THYST_W 0x0E
70/* write-only */
71#define ADM1021_REG_ONESHOT 0x0F
72
73
74/* Conversions. Rounding and limit checking is only done on the TO_REG
75 variants. Note that you should be a bit careful with which arguments
76 these macros are called: arguments may be evaluated more than once.
77 Fixing this is just not worth it. */
78/* Conversions note: 1021 uses normal integer signed-byte format*/
79#define TEMP_FROM_REG(val) (val > 127 ? (val-256)*1000 : val*1000)
80#define TEMP_TO_REG(val) (SENSORS_LIMIT((val < 0 ? (val/1000)+256 : val/1000),0,255))
81
82/* Initial values */
83
84/* Note: Even though I left the low and high limits named os and hyst,
85they don't quite work like a thermostat the way the LM75 does. I.e.,
86a lower temp than THYST actually triggers an alarm instead of
87clearing it. Weird, ey? --Phil */
88
89/* Each client has this additional data */
90struct adm1021_data {
91 struct i2c_client client;
92 enum chips type;
93
94 struct semaphore update_lock;
95 char valid; /* !=0 if following fields are valid */
96 unsigned long last_updated; /* In jiffies */
97
98 u8 temp_max; /* Register values */
99 u8 temp_hyst;
100 u8 temp_input;
101 u8 remote_temp_max;
102 u8 remote_temp_hyst;
103 u8 remote_temp_input;
104 u8 alarms;
105 /* Special values for ADM1023 only */
106 u8 remote_temp_prec;
107 u8 remote_temp_os_prec;
108 u8 remote_temp_hyst_prec;
109 u8 remote_temp_offset;
110 u8 remote_temp_offset_prec;
111};
112
113static int adm1021_attach_adapter(struct i2c_adapter *adapter);
114static int adm1021_detect(struct i2c_adapter *adapter, int address, int kind);
115static void adm1021_init_client(struct i2c_client *client);
116static int adm1021_detach_client(struct i2c_client *client);
117static int adm1021_read_value(struct i2c_client *client, u8 reg);
118static int adm1021_write_value(struct i2c_client *client, u8 reg,
119 u16 value);
120static struct adm1021_data *adm1021_update_device(struct device *dev);
121
122/* (amalysh) read only mode, otherwise any limit's writing confuse BIOS */
123static int read_only = 0;
124
125
126/* This is the driver that will be inserted */
127static struct i2c_driver adm1021_driver = {
128 .owner = THIS_MODULE,
129 .name = "adm1021",
130 .id = I2C_DRIVERID_ADM1021,
131 .flags = I2C_DF_NOTIFY,
132 .attach_adapter = adm1021_attach_adapter,
133 .detach_client = adm1021_detach_client,
134};
135
136#define show(value) \
137static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf) \
138{ \
139 struct adm1021_data *data = adm1021_update_device(dev); \
140 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->value)); \
141}
142show(temp_max);
143show(temp_hyst);
144show(temp_input);
145show(remote_temp_max);
146show(remote_temp_hyst);
147show(remote_temp_input);
148
149#define show2(value) \
150static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf) \
151{ \
152 struct adm1021_data *data = adm1021_update_device(dev); \
153 return sprintf(buf, "%d\n", data->value); \
154}
155show2(alarms);
156
157#define set(value, reg) \
158static ssize_t set_##value(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) \
159{ \
160 struct i2c_client *client = to_i2c_client(dev); \
161 struct adm1021_data *data = i2c_get_clientdata(client); \
162 int temp = simple_strtoul(buf, NULL, 10); \
163 \
164 down(&data->update_lock); \
165 data->value = TEMP_TO_REG(temp); \
166 adm1021_write_value(client, reg, data->value); \
167 up(&data->update_lock); \
168 return count; \
169}
170set(temp_max, ADM1021_REG_TOS_W);
171set(temp_hyst, ADM1021_REG_THYST_W);
172set(remote_temp_max, ADM1021_REG_REMOTE_TOS_W);
173set(remote_temp_hyst, ADM1021_REG_REMOTE_THYST_W);
174
175static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max, set_temp_max);
176static DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp_hyst, set_temp_hyst);
177static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input, NULL);
178static DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_remote_temp_max, set_remote_temp_max);
179static DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_remote_temp_hyst, set_remote_temp_hyst);
180static DEVICE_ATTR(temp2_input, S_IRUGO, show_remote_temp_input, NULL);
181static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
182
183
184static int adm1021_attach_adapter(struct i2c_adapter *adapter)
185{
186 if (!(adapter->class & I2C_CLASS_HWMON))
187 return 0;
188 return i2c_detect(adapter, &addr_data, adm1021_detect);
189}
190
191static int adm1021_detect(struct i2c_adapter *adapter, int address, int kind)
192{
193 int i;
194 struct i2c_client *new_client;
195 struct adm1021_data *data;
196 int err = 0;
197 const char *type_name = "";
198
199 /* Make sure we aren't probing the ISA bus!! This is just a safety check
200 at this moment; i2c_detect really won't call us. */
201#ifdef DEBUG
202 if (i2c_is_isa_adapter(adapter)) {
203 dev_dbg(&adapter->dev, "adm1021_detect called for an ISA bus adapter?!?\n");
204 return 0;
205 }
206#endif
207
208 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
209 goto error0;
210
211 /* OK. For now, we presume we have a valid client. We now create the
212 client structure, even though we cannot fill it completely yet.
213 But it allows us to access adm1021_{read,write}_value. */
214
215 if (!(data = kmalloc(sizeof(struct adm1021_data), GFP_KERNEL))) {
216 err = -ENOMEM;
217 goto error0;
218 }
219 memset(data, 0, sizeof(struct adm1021_data));
220
221 new_client = &data->client;
222 i2c_set_clientdata(new_client, data);
223 new_client->addr = address;
224 new_client->adapter = adapter;
225 new_client->driver = &adm1021_driver;
226 new_client->flags = 0;
227
228 /* Now, we do the remaining detection. */
229 if (kind < 0) {
230 if ((adm1021_read_value(new_client, ADM1021_REG_STATUS) & 0x03) != 0x00
231 || (adm1021_read_value(new_client, ADM1021_REG_CONFIG_R) & 0x3F) != 0x00
232 || (adm1021_read_value(new_client, ADM1021_REG_CONV_RATE_R) & 0xF8) != 0x00) {
233 err = -ENODEV;
234 goto error1;
235 }
236 }
237
238 /* Determine the chip type. */
239 if (kind <= 0) {
240 i = adm1021_read_value(new_client, ADM1021_REG_MAN_ID);
241 if (i == 0x41)
242 if ((adm1021_read_value(new_client, ADM1021_REG_DEV_ID) & 0x0F0) == 0x030)
243 kind = adm1023;
244 else
245 kind = adm1021;
246 else if (i == 0x49)
247 kind = thmc10;
248 else if (i == 0x23)
249 kind = gl523sm;
250 else if ((i == 0x4d) &&
251 (adm1021_read_value(new_client, ADM1021_REG_DEV_ID) == 0x01))
252 kind = max1617a;
253 else if (i == 0x54)
254 kind = mc1066;
255 /* LM84 Mfr ID in a different place, and it has more unused bits */
256 else if (adm1021_read_value(new_client, ADM1021_REG_CONV_RATE_R) == 0x00
257 && (kind == 0 /* skip extra detection */
258 || ((adm1021_read_value(new_client, ADM1021_REG_CONFIG_R) & 0x7F) == 0x00
259 && (adm1021_read_value(new_client, ADM1021_REG_STATUS) & 0xAB) == 0x00)))
260 kind = lm84;
261 else
262 kind = max1617;
263 }
264
265 if (kind == max1617) {
266 type_name = "max1617";
267 } else if (kind == max1617a) {
268 type_name = "max1617a";
269 } else if (kind == adm1021) {
270 type_name = "adm1021";
271 } else if (kind == adm1023) {
272 type_name = "adm1023";
273 } else if (kind == thmc10) {
274 type_name = "thmc10";
275 } else if (kind == lm84) {
276 type_name = "lm84";
277 } else if (kind == gl523sm) {
278 type_name = "gl523sm";
279 } else if (kind == mc1066) {
280 type_name = "mc1066";
281 }
282
283 /* Fill in the remaining client fields and put it into the global list */
284 strlcpy(new_client->name, type_name, I2C_NAME_SIZE);
285 data->type = kind;
286 data->valid = 0;
287 init_MUTEX(&data->update_lock);
288
289 /* Tell the I2C layer a new client has arrived */
290 if ((err = i2c_attach_client(new_client)))
291 goto error1;
292
293 /* Initialize the ADM1021 chip */
294 if (kind != lm84)
295 adm1021_init_client(new_client);
296
297 /* Register sysfs hooks */
298 device_create_file(&new_client->dev, &dev_attr_temp1_max);
299 device_create_file(&new_client->dev, &dev_attr_temp1_min);
300 device_create_file(&new_client->dev, &dev_attr_temp1_input);
301 device_create_file(&new_client->dev, &dev_attr_temp2_max);
302 device_create_file(&new_client->dev, &dev_attr_temp2_min);
303 device_create_file(&new_client->dev, &dev_attr_temp2_input);
304 device_create_file(&new_client->dev, &dev_attr_alarms);
305
306 return 0;
307
308error1:
309 kfree(data);
310error0:
311 return err;
312}
313
314static void adm1021_init_client(struct i2c_client *client)
315{
316 /* Enable ADC and disable suspend mode */
317 adm1021_write_value(client, ADM1021_REG_CONFIG_W,
318 adm1021_read_value(client, ADM1021_REG_CONFIG_R) & 0xBF);
319 /* Set Conversion rate to 1/sec (this can be tinkered with) */
320 adm1021_write_value(client, ADM1021_REG_CONV_RATE_W, 0x04);
321}
322
323static int adm1021_detach_client(struct i2c_client *client)
324{
325 int err;
326
327 if ((err = i2c_detach_client(client))) {
328 dev_err(&client->dev, "Client deregistration failed, client not detached.\n");
329 return err;
330 }
331
332 kfree(i2c_get_clientdata(client));
333 return 0;
334}
335
336/* All registers are byte-sized */
337static int adm1021_read_value(struct i2c_client *client, u8 reg)
338{
339 return i2c_smbus_read_byte_data(client, reg);
340}
341
342static int adm1021_write_value(struct i2c_client *client, u8 reg, u16 value)
343{
344 if (!read_only)
345 return i2c_smbus_write_byte_data(client, reg, value);
346 return 0;
347}
348
349static struct adm1021_data *adm1021_update_device(struct device *dev)
350{
351 struct i2c_client *client = to_i2c_client(dev);
352 struct adm1021_data *data = i2c_get_clientdata(client);
353
354 down(&data->update_lock);
355
356 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
357 || !data->valid) {
358 dev_dbg(&client->dev, "Starting adm1021 update\n");
359
360 data->temp_input = adm1021_read_value(client, ADM1021_REG_TEMP);
361 data->temp_max = adm1021_read_value(client, ADM1021_REG_TOS_R);
362 data->temp_hyst = adm1021_read_value(client, ADM1021_REG_THYST_R);
363 data->remote_temp_input = adm1021_read_value(client, ADM1021_REG_REMOTE_TEMP);
364 data->remote_temp_max = adm1021_read_value(client, ADM1021_REG_REMOTE_TOS_R);
365 data->remote_temp_hyst = adm1021_read_value(client, ADM1021_REG_REMOTE_THYST_R);
366 data->alarms = adm1021_read_value(client, ADM1021_REG_STATUS) & 0x7c;
367 if (data->type == adm1023) {
368 data->remote_temp_prec = adm1021_read_value(client, ADM1021_REG_REM_TEMP_PREC);
369 data->remote_temp_os_prec = adm1021_read_value(client, ADM1021_REG_REM_TOS_PREC);
370 data->remote_temp_hyst_prec = adm1021_read_value(client, ADM1021_REG_REM_THYST_PREC);
371 data->remote_temp_offset = adm1021_read_value(client, ADM1021_REG_REM_OFFSET);
372 data->remote_temp_offset_prec = adm1021_read_value(client, ADM1021_REG_REM_OFFSET_PREC);
373 }
374 data->last_updated = jiffies;
375 data->valid = 1;
376 }
377
378 up(&data->update_lock);
379
380 return data;
381}
382
383static int __init sensors_adm1021_init(void)
384{
385 return i2c_add_driver(&adm1021_driver);
386}
387
388static void __exit sensors_adm1021_exit(void)
389{
390 i2c_del_driver(&adm1021_driver);
391}
392
393MODULE_AUTHOR ("Frodo Looijaard <frodol@dds.nl> and "
394 "Philip Edelbrock <phil@netroedge.com>");
395MODULE_DESCRIPTION("adm1021 driver");
396MODULE_LICENSE("GPL");
397
398module_param(read_only, bool, 0);
399MODULE_PARM_DESC(read_only, "Don't set any values, read only mode");
400
401module_init(sensors_adm1021_init)
402module_exit(sensors_adm1021_exit)
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