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Diffstat (limited to 'drivers/i2c/chips/adm1021.c')
-rw-r--r--drivers/i2c/chips/adm1021.c411
1 files changed, 411 insertions, 0 deletions
diff --git a/drivers/i2c/chips/adm1021.c b/drivers/i2c/chips/adm1021.c
new file mode 100644
index 000000000000..9c59a370b6d9
--- /dev/null
+++ b/drivers/i2c/chips/adm1021.c
@@ -0,0 +1,411 @@
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/config.h>
23#include <linux/module.h>
24#include <linux/init.h>
25#include <linux/slab.h>
26#include <linux/jiffies.h>
27#include <linux/i2c.h>
28#include <linux/i2c-sensor.h>
29
30
31/* Addresses to scan */
32static unsigned short normal_i2c[] = { 0x18, 0x19, 0x1a,
33 0x29, 0x2a, 0x2b,
34 0x4c, 0x4d, 0x4e,
35 I2C_CLIENT_END };
36static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END };
37
38/* Insmod parameters */
39SENSORS_INSMOD_8(adm1021, adm1023, max1617, max1617a, thmc10, lm84, gl523sm, mc1066);
40
41/* adm1021 constants specified below */
42
43/* The adm1021 registers */
44/* Read-only */
45#define ADM1021_REG_TEMP 0x00
46#define ADM1021_REG_REMOTE_TEMP 0x01
47#define ADM1021_REG_STATUS 0x02
48#define ADM1021_REG_MAN_ID 0x0FE /* 0x41 = AMD, 0x49 = TI, 0x4D = Maxim, 0x23 = Genesys , 0x54 = Onsemi*/
49#define ADM1021_REG_DEV_ID 0x0FF /* ADM1021 = 0x0X, ADM1023 = 0x3X */
50#define ADM1021_REG_DIE_CODE 0x0FF /* MAX1617A */
51/* These use different addresses for reading/writing */
52#define ADM1021_REG_CONFIG_R 0x03
53#define ADM1021_REG_CONFIG_W 0x09
54#define ADM1021_REG_CONV_RATE_R 0x04
55#define ADM1021_REG_CONV_RATE_W 0x0A
56/* These are for the ADM1023's additional precision on the remote temp sensor */
57#define ADM1021_REG_REM_TEMP_PREC 0x010
58#define ADM1021_REG_REM_OFFSET 0x011
59#define ADM1021_REG_REM_OFFSET_PREC 0x012
60#define ADM1021_REG_REM_TOS_PREC 0x013
61#define ADM1021_REG_REM_THYST_PREC 0x014
62/* limits */
63#define ADM1021_REG_TOS_R 0x05
64#define ADM1021_REG_TOS_W 0x0B
65#define ADM1021_REG_REMOTE_TOS_R 0x07
66#define ADM1021_REG_REMOTE_TOS_W 0x0D
67#define ADM1021_REG_THYST_R 0x06
68#define ADM1021_REG_THYST_W 0x0C
69#define ADM1021_REG_REMOTE_THYST_R 0x08
70#define ADM1021_REG_REMOTE_THYST_W 0x0E
71/* write-only */
72#define ADM1021_REG_ONESHOT 0x0F
73
74
75/* Conversions. Rounding and limit checking is only done on the TO_REG
76 variants. Note that you should be a bit careful with which arguments
77 these macros are called: arguments may be evaluated more than once.
78 Fixing this is just not worth it. */
79/* Conversions note: 1021 uses normal integer signed-byte format*/
80#define TEMP_FROM_REG(val) (val > 127 ? (val-256)*1000 : val*1000)
81#define TEMP_TO_REG(val) (SENSORS_LIMIT((val < 0 ? (val/1000)+256 : val/1000),0,255))
82
83/* Initial values */
84
85/* Note: Even though I left the low and high limits named os and hyst,
86they don't quite work like a thermostat the way the LM75 does. I.e.,
87a lower temp than THYST actually triggers an alarm instead of
88clearing it. Weird, ey? --Phil */
89
90/* Each client has this additional data */
91struct adm1021_data {
92 struct i2c_client client;
93 enum chips type;
94
95 struct semaphore update_lock;
96 char valid; /* !=0 if following fields are valid */
97 unsigned long last_updated; /* In jiffies */
98
99 u8 temp_max; /* Register values */
100 u8 temp_hyst;
101 u8 temp_input;
102 u8 remote_temp_max;
103 u8 remote_temp_hyst;
104 u8 remote_temp_input;
105 u8 alarms;
106 /* special values for ADM1021 only */
107 u8 die_code;
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
116static int adm1021_attach_adapter(struct i2c_adapter *adapter);
117static int adm1021_detect(struct i2c_adapter *adapter, int address, int kind);
118static void adm1021_init_client(struct i2c_client *client);
119static int adm1021_detach_client(struct i2c_client *client);
120static int adm1021_read_value(struct i2c_client *client, u8 reg);
121static int adm1021_write_value(struct i2c_client *client, u8 reg,
122 u16 value);
123static struct adm1021_data *adm1021_update_device(struct device *dev);
124
125/* (amalysh) read only mode, otherwise any limit's writing confuse BIOS */
126static int read_only = 0;
127
128
129/* This is the driver that will be inserted */
130static struct i2c_driver adm1021_driver = {
131 .owner = THIS_MODULE,
132 .name = "adm1021",
133 .id = I2C_DRIVERID_ADM1021,
134 .flags = I2C_DF_NOTIFY,
135 .attach_adapter = adm1021_attach_adapter,
136 .detach_client = adm1021_detach_client,
137};
138
139#define show(value) \
140static ssize_t show_##value(struct device *dev, char *buf) \
141{ \
142 struct adm1021_data *data = adm1021_update_device(dev); \
143 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->value)); \
144}
145show(temp_max);
146show(temp_hyst);
147show(temp_input);
148show(remote_temp_max);
149show(remote_temp_hyst);
150show(remote_temp_input);
151
152#define show2(value) \
153static ssize_t show_##value(struct device *dev, char *buf) \
154{ \
155 struct adm1021_data *data = adm1021_update_device(dev); \
156 return sprintf(buf, "%d\n", data->value); \
157}
158show2(alarms);
159show2(die_code);
160
161#define set(value, reg) \
162static ssize_t set_##value(struct device *dev, const char *buf, size_t count) \
163{ \
164 struct i2c_client *client = to_i2c_client(dev); \
165 struct adm1021_data *data = i2c_get_clientdata(client); \
166 int temp = simple_strtoul(buf, NULL, 10); \
167 \
168 down(&data->update_lock); \
169 data->value = TEMP_TO_REG(temp); \
170 adm1021_write_value(client, reg, data->value); \
171 up(&data->update_lock); \
172 return count; \
173}
174set(temp_max, ADM1021_REG_TOS_W);
175set(temp_hyst, ADM1021_REG_THYST_W);
176set(remote_temp_max, ADM1021_REG_REMOTE_TOS_W);
177set(remote_temp_hyst, ADM1021_REG_REMOTE_THYST_W);
178
179static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max, set_temp_max);
180static DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp_hyst, set_temp_hyst);
181static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input, NULL);
182static DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_remote_temp_max, set_remote_temp_max);
183static DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_remote_temp_hyst, set_remote_temp_hyst);
184static DEVICE_ATTR(temp2_input, S_IRUGO, show_remote_temp_input, NULL);
185static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
186static DEVICE_ATTR(die_code, S_IRUGO, show_die_code, NULL);
187
188
189static int adm1021_attach_adapter(struct i2c_adapter *adapter)
190{
191 if (!(adapter->class & I2C_CLASS_HWMON))
192 return 0;
193 return i2c_detect(adapter, &addr_data, adm1021_detect);
194}
195
196static int adm1021_detect(struct i2c_adapter *adapter, int address, int kind)
197{
198 int i;
199 struct i2c_client *new_client;
200 struct adm1021_data *data;
201 int err = 0;
202 const char *type_name = "";
203
204 /* Make sure we aren't probing the ISA bus!! This is just a safety check
205 at this moment; i2c_detect really won't call us. */
206#ifdef DEBUG
207 if (i2c_is_isa_adapter(adapter)) {
208 dev_dbg(&adapter->dev, "adm1021_detect called for an ISA bus adapter?!?\n");
209 return 0;
210 }
211#endif
212
213 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
214 goto error0;
215
216 /* OK. For now, we presume we have a valid client. We now create the
217 client structure, even though we cannot fill it completely yet.
218 But it allows us to access adm1021_{read,write}_value. */
219
220 if (!(data = kmalloc(sizeof(struct adm1021_data), GFP_KERNEL))) {
221 err = -ENOMEM;
222 goto error0;
223 }
224 memset(data, 0, sizeof(struct adm1021_data));
225
226 new_client = &data->client;
227 i2c_set_clientdata(new_client, data);
228 new_client->addr = address;
229 new_client->adapter = adapter;
230 new_client->driver = &adm1021_driver;
231 new_client->flags = 0;
232
233 /* Now, we do the remaining detection. */
234 if (kind < 0) {
235 if ((adm1021_read_value(new_client, ADM1021_REG_STATUS) & 0x03) != 0x00
236 || (adm1021_read_value(new_client, ADM1021_REG_CONFIG_R) & 0x3F) != 0x00
237 || (adm1021_read_value(new_client, ADM1021_REG_CONV_RATE_R) & 0xF8) != 0x00) {
238 err = -ENODEV;
239 goto error1;
240 }
241 }
242
243 /* Determine the chip type. */
244 if (kind <= 0) {
245 i = adm1021_read_value(new_client, ADM1021_REG_MAN_ID);
246 if (i == 0x41)
247 if ((adm1021_read_value(new_client, ADM1021_REG_DEV_ID) & 0x0F0) == 0x030)
248 kind = adm1023;
249 else
250 kind = adm1021;
251 else if (i == 0x49)
252 kind = thmc10;
253 else if (i == 0x23)
254 kind = gl523sm;
255 else if ((i == 0x4d) &&
256 (adm1021_read_value(new_client, ADM1021_REG_DEV_ID) == 0x01))
257 kind = max1617a;
258 else if (i == 0x54)
259 kind = mc1066;
260 /* LM84 Mfr ID in a different place, and it has more unused bits */
261 else if (adm1021_read_value(new_client, ADM1021_REG_CONV_RATE_R) == 0x00
262 && (kind == 0 /* skip extra detection */
263 || ((adm1021_read_value(new_client, ADM1021_REG_CONFIG_R) & 0x7F) == 0x00
264 && (adm1021_read_value(new_client, ADM1021_REG_STATUS) & 0xAB) == 0x00)))
265 kind = lm84;
266 else
267 kind = max1617;
268 }
269
270 if (kind == max1617) {
271 type_name = "max1617";
272 } else if (kind == max1617a) {
273 type_name = "max1617a";
274 } else if (kind == adm1021) {
275 type_name = "adm1021";
276 } else if (kind == adm1023) {
277 type_name = "adm1023";
278 } else if (kind == thmc10) {
279 type_name = "thmc10";
280 } else if (kind == lm84) {
281 type_name = "lm84";
282 } else if (kind == gl523sm) {
283 type_name = "gl523sm";
284 } else if (kind == mc1066) {
285 type_name = "mc1066";
286 }
287
288 /* Fill in the remaining client fields and put it into the global list */
289 strlcpy(new_client->name, type_name, I2C_NAME_SIZE);
290 data->type = kind;
291 data->valid = 0;
292 init_MUTEX(&data->update_lock);
293
294 /* Tell the I2C layer a new client has arrived */
295 if ((err = i2c_attach_client(new_client)))
296 goto error1;
297
298 /* Initialize the ADM1021 chip */
299 if (kind != lm84)
300 adm1021_init_client(new_client);
301
302 /* Register sysfs hooks */
303 device_create_file(&new_client->dev, &dev_attr_temp1_max);
304 device_create_file(&new_client->dev, &dev_attr_temp1_min);
305 device_create_file(&new_client->dev, &dev_attr_temp1_input);
306 device_create_file(&new_client->dev, &dev_attr_temp2_max);
307 device_create_file(&new_client->dev, &dev_attr_temp2_min);
308 device_create_file(&new_client->dev, &dev_attr_temp2_input);
309 device_create_file(&new_client->dev, &dev_attr_alarms);
310 if (data->type == adm1021)
311 device_create_file(&new_client->dev, &dev_attr_die_code);
312
313 return 0;
314
315error1:
316 kfree(data);
317error0:
318 return err;
319}
320
321static void adm1021_init_client(struct i2c_client *client)
322{
323 /* Enable ADC and disable suspend mode */
324 adm1021_write_value(client, ADM1021_REG_CONFIG_W,
325 adm1021_read_value(client, ADM1021_REG_CONFIG_R) & 0xBF);
326 /* Set Conversion rate to 1/sec (this can be tinkered with) */
327 adm1021_write_value(client, ADM1021_REG_CONV_RATE_W, 0x04);
328}
329
330static int adm1021_detach_client(struct i2c_client *client)
331{
332 int err;
333
334 if ((err = i2c_detach_client(client))) {
335 dev_err(&client->dev, "Client deregistration failed, client not detached.\n");
336 return err;
337 }
338
339 kfree(i2c_get_clientdata(client));
340 return 0;
341}
342
343/* All registers are byte-sized */
344static int adm1021_read_value(struct i2c_client *client, u8 reg)
345{
346 return i2c_smbus_read_byte_data(client, reg);
347}
348
349static int adm1021_write_value(struct i2c_client *client, u8 reg, u16 value)
350{
351 if (!read_only)
352 return i2c_smbus_write_byte_data(client, reg, value);
353 return 0;
354}
355
356static struct adm1021_data *adm1021_update_device(struct device *dev)
357{
358 struct i2c_client *client = to_i2c_client(dev);
359 struct adm1021_data *data = i2c_get_clientdata(client);
360
361 down(&data->update_lock);
362
363 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
364 || !data->valid) {
365 dev_dbg(&client->dev, "Starting adm1021 update\n");
366
367 data->temp_input = adm1021_read_value(client, ADM1021_REG_TEMP);
368 data->temp_max = adm1021_read_value(client, ADM1021_REG_TOS_R);
369 data->temp_hyst = adm1021_read_value(client, ADM1021_REG_THYST_R);
370 data->remote_temp_input = adm1021_read_value(client, ADM1021_REG_REMOTE_TEMP);
371 data->remote_temp_max = adm1021_read_value(client, ADM1021_REG_REMOTE_TOS_R);
372 data->remote_temp_hyst = adm1021_read_value(client, ADM1021_REG_REMOTE_THYST_R);
373 data->alarms = adm1021_read_value(client, ADM1021_REG_STATUS) & 0x7c;
374 if (data->type == adm1021)
375 data->die_code = adm1021_read_value(client, ADM1021_REG_DIE_CODE);
376 if (data->type == adm1023) {
377 data->remote_temp_prec = adm1021_read_value(client, ADM1021_REG_REM_TEMP_PREC);
378 data->remote_temp_os_prec = adm1021_read_value(client, ADM1021_REG_REM_TOS_PREC);
379 data->remote_temp_hyst_prec = adm1021_read_value(client, ADM1021_REG_REM_THYST_PREC);
380 data->remote_temp_offset = adm1021_read_value(client, ADM1021_REG_REM_OFFSET);
381 data->remote_temp_offset_prec = adm1021_read_value(client, ADM1021_REG_REM_OFFSET_PREC);
382 }
383 data->last_updated = jiffies;
384 data->valid = 1;
385 }
386
387 up(&data->update_lock);
388
389 return data;
390}
391
392static int __init sensors_adm1021_init(void)
393{
394 return i2c_add_driver(&adm1021_driver);
395}
396
397static void __exit sensors_adm1021_exit(void)
398{
399 i2c_del_driver(&adm1021_driver);
400}
401
402MODULE_AUTHOR ("Frodo Looijaard <frodol@dds.nl> and "
403 "Philip Edelbrock <phil@netroedge.com>");
404MODULE_DESCRIPTION("adm1021 driver");
405MODULE_LICENSE("GPL");
406
407module_param(read_only, bool, 0);
408MODULE_PARM_DESC(read_only, "Don't set any values, read only mode");
409
410module_init(sensors_adm1021_init)
411module_exit(sensors_adm1021_exit)
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