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1da177e4 LT |
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 | ||
1da177e4 LT |
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 */ | |
31 | static unsigned short normal_i2c[] = { 0x18, 0x19, 0x1a, | |
32 | 0x29, 0x2a, 0x2b, | |
33 | 0x4c, 0x4d, 0x4e, | |
34 | I2C_CLIENT_END }; | |
35 | static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END }; | |
36 | ||
37 | /* Insmod parameters */ | |
38 | SENSORS_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, | |
85 | they don't quite work like a thermostat the way the LM75 does. I.e., | |
86 | a lower temp than THYST actually triggers an alarm instead of | |
87 | clearing it. Weird, ey? --Phil */ | |
88 | ||
89 | /* Each client has this additional data */ | |
90 | struct 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; | |
1da177e4 LT |
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 | ||
113 | static int adm1021_attach_adapter(struct i2c_adapter *adapter); | |
114 | static int adm1021_detect(struct i2c_adapter *adapter, int address, int kind); | |
115 | static void adm1021_init_client(struct i2c_client *client); | |
116 | static int adm1021_detach_client(struct i2c_client *client); | |
117 | static int adm1021_read_value(struct i2c_client *client, u8 reg); | |
118 | static int adm1021_write_value(struct i2c_client *client, u8 reg, | |
119 | u16 value); | |
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 = 0; | |
124 | ||
125 | ||
126 | /* This is the driver that will be inserted */ | |
127 | static 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) \ | |
74880c06 | 137 | static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
138 | { \ |
139 | struct adm1021_data *data = adm1021_update_device(dev); \ | |
140 | return sprintf(buf, "%d\n", TEMP_FROM_REG(data->value)); \ | |
141 | } | |
142 | show(temp_max); | |
143 | show(temp_hyst); | |
144 | show(temp_input); | |
145 | show(remote_temp_max); | |
146 | show(remote_temp_hyst); | |
147 | show(remote_temp_input); | |
148 | ||
149 | #define show2(value) \ | |
74880c06 | 150 | static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
151 | { \ |
152 | struct adm1021_data *data = adm1021_update_device(dev); \ | |
153 | return sprintf(buf, "%d\n", data->value); \ | |
154 | } | |
155 | show2(alarms); | |
1da177e4 LT |
156 | |
157 | #define set(value, reg) \ | |
74880c06 | 158 | static ssize_t set_##value(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) \ |
1da177e4 LT |
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 | } | |
170 | set(temp_max, ADM1021_REG_TOS_W); | |
171 | set(temp_hyst, ADM1021_REG_THYST_W); | |
172 | set(remote_temp_max, ADM1021_REG_REMOTE_TOS_W); | |
173 | set(remote_temp_hyst, ADM1021_REG_REMOTE_THYST_W); | |
174 | ||
175 | static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max, set_temp_max); | |
176 | static DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp_hyst, set_temp_hyst); | |
177 | static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input, NULL); | |
178 | static DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_remote_temp_max, set_remote_temp_max); | |
179 | static DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_remote_temp_hyst, set_remote_temp_hyst); | |
180 | static DEVICE_ATTR(temp2_input, S_IRUGO, show_remote_temp_input, NULL); | |
181 | static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); | |
1da177e4 LT |
182 | |
183 | ||
184 | static 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 | ||
191 | static 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); | |
1da177e4 LT |
305 | |
306 | return 0; | |
307 | ||
308 | error1: | |
309 | kfree(data); | |
310 | error0: | |
311 | return err; | |
312 | } | |
313 | ||
314 | static 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 | ||
323 | static 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 */ | |
337 | static int adm1021_read_value(struct i2c_client *client, u8 reg) | |
338 | { | |
339 | return i2c_smbus_read_byte_data(client, reg); | |
340 | } | |
341 | ||
342 | static 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 | ||
349 | static 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; | |
1da177e4 LT |
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 | ||
383 | static int __init sensors_adm1021_init(void) | |
384 | { | |
385 | return i2c_add_driver(&adm1021_driver); | |
386 | } | |
387 | ||
388 | static void __exit sensors_adm1021_exit(void) | |
389 | { | |
390 | i2c_del_driver(&adm1021_driver); | |
391 | } | |
392 | ||
393 | MODULE_AUTHOR ("Frodo Looijaard <frodol@dds.nl> and " | |
394 | "Philip Edelbrock <phil@netroedge.com>"); | |
395 | MODULE_DESCRIPTION("adm1021 driver"); | |
396 | MODULE_LICENSE("GPL"); | |
397 | ||
398 | module_param(read_only, bool, 0); | |
399 | MODULE_PARM_DESC(read_only, "Don't set any values, read only mode"); | |
400 | ||
401 | module_init(sensors_adm1021_init) | |
402 | module_exit(sensors_adm1021_exit) |