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hwmon: (lm80) Simplify TEMP_FROM_REG
[mirror_ubuntu-bionic-kernel.git] / drivers / hwmon / lm80.c
CommitLineData
1da177e4
LT		 1/*
2 * lm80.c - From lm_sensors, Linux kernel modules for hardware
1160631b 3 * monitoring
1da177e4 4 * Copyright (C) 1998, 1999 Frodo Looijaard <frodol@dds.nl>
1160631b 5 * and Philip Edelbrock <phil@netroedge.com>
1da177e4
LT		 6 *
7 * Ported to Linux 2.6 by Tiago Sousa <mirage@kaotik.org>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 */
23
1da177e4
LT		 24#include <linux/module.h>
25#include <linux/init.h>
26#include <linux/slab.h>
27#include <linux/jiffies.h>
28#include <linux/i2c.h>
943b0830 29#include <linux/hwmon.h>
f8181762 30#include <linux/hwmon-sysfs.h>
943b0830 31#include <linux/err.h>
9a61bf63 32#include <linux/mutex.h>
1da177e4
LT		 33
34/* Addresses to scan */
25e9c86d
MH		 35static const unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d,
36 0x2e, 0x2f, I2C_CLIENT_END };
1da177e4 37
1da177e4
LT		 38/* Many LM80 constants specified below */
39
40/* The LM80 registers */
41#define LM80_REG_IN_MAX(nr) (0x2a + (nr) * 2)
42#define LM80_REG_IN_MIN(nr) (0x2b + (nr) * 2)
43#define LM80_REG_IN(nr) (0x20 + (nr))
44
45#define LM80_REG_FAN1 0x28
46#define LM80_REG_FAN2 0x29
47#define LM80_REG_FAN_MIN(nr) (0x3b + (nr))
48
49#define LM80_REG_TEMP 0x27
50#define LM80_REG_TEMP_HOT_MAX 0x38
51#define LM80_REG_TEMP_HOT_HYST 0x39
52#define LM80_REG_TEMP_OS_MAX 0x3a
53#define LM80_REG_TEMP_OS_HYST 0x3b
54
55#define LM80_REG_CONFIG 0x00
56#define LM80_REG_ALARM1 0x01
57#define LM80_REG_ALARM2 0x02
58#define LM80_REG_MASK1 0x03
59#define LM80_REG_MASK2 0x04
60#define LM80_REG_FANDIV 0x05
61#define LM80_REG_RES 0x06
62
9908ad4c
JD		 63#define LM96080_REG_CONV_RATE 0x07
64#define LM96080_REG_MAN_ID 0x3e
65#define LM96080_REG_DEV_ID 0x3f
66
1da177e4 67
1160631b
GR		 68/*
69 * Conversions. Rounding and limit checking is only done on the TO_REG
70 * variants. Note that you should be a bit careful with which arguments
71 * these macros are called: arguments may be evaluated more than once.
72 * Fixing this is just not worth it.
73 */
1da177e4 74
2a844c14 75#define IN_TO_REG(val) (clamp_val(((val) + 5) / 10, 0, 255))
66b3b1f7 76#define IN_FROM_REG(val) ((val) * 10)
1da177e4
LT		 77
78static inline unsigned char FAN_TO_REG(unsigned rpm, unsigned div)
79{
80 if (rpm == 0)
81 return 255;
2a844c14
GR		 82 rpm = clamp_val(rpm, 1, 1000000);
83 return clamp_val((1350000 + rpm * div / 2) / (rpm * div), 1, 254);
1da177e4
LT		 84}
85
66b3b1f7
FM		 86#define FAN_FROM_REG(val, div) ((val) == 0 ? -1 : \
87 (val) == 255 ? 0 : 1350000/((div) * (val)))
1da177e4 88
9028ff8e 89#define TEMP_FROM_REG(temp) ((temp) * 125 / 32)
1da177e4 90
66b3b1f7
FM		 91#define TEMP_LIMIT_FROM_REG(val) (((val) > 0x80 ? \
92 (val) - 0x100 : (val)) * 1000)
1da177e4 93
2a844c14 94#define TEMP_LIMIT_TO_REG(val) clamp_val((val) < 0 ? \
66b3b1f7 95 ((val) - 500) / 1000 : ((val) + 500) / 1000, 0, 255)
1da177e4
LT		 96
97#define DIV_FROM_REG(val) (1 << (val))
98
99/*
100 * Client data (each client gets its own)
101 */
102
103struct lm80_data {
118c9a61 104 struct i2c_client *client;
9a61bf63 105 struct mutex update_lock;
96585f1a 106 char error; /* !=0 if error occurred during last update */
1da177e4
LT		 107 char valid; /* !=0 if following fields are valid */
108 unsigned long last_updated; /* In jiffies */
109
110 u8 in[7]; /* Register value */
111 u8 in_max[7]; /* Register value */
112 u8 in_min[7]; /* Register value */
113 u8 fan[2]; /* Register value */
114 u8 fan_min[2]; /* Register value */
115 u8 fan_div[2]; /* Register encoding, shifted right */
9028ff8e 116 s16 temp; /* Register values */
1da177e4
LT		 117 u8 temp_hot_max; /* Register value */
118 u8 temp_hot_hyst; /* Register value */
119 u8 temp_os_max; /* Register value */
120 u8 temp_os_hyst; /* Register value */
121 u16 alarms; /* Register encoding, combined */
122};
123
6cc37ee5 124/*
1da177e4
LT		 125 * Functions declaration
126 */
127
8c8bacc8
JD		 128static int lm80_probe(struct i2c_client *client,
129 const struct i2c_device_id *id);
310ec792 130static int lm80_detect(struct i2c_client *client, struct i2c_board_info *info);
1da177e4 131static void lm80_init_client(struct i2c_client *client);
1da177e4
LT		 132static struct lm80_data *lm80_update_device(struct device *dev);
133static int lm80_read_value(struct i2c_client *client, u8 reg);
134static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value);
135
136/*
137 * Driver data (common to all clients)
138 */
139
8c8bacc8 140static const struct i2c_device_id lm80_id[] = {
1f86df49 141 { "lm80", 0 },
9908ad4c 142 { "lm96080", 1 },
8c8bacc8
JD		 143 { }
144};
145MODULE_DEVICE_TABLE(i2c, lm80_id);
146
1da177e4 147static struct i2c_driver lm80_driver = {
8c8bacc8 148 .class = I2C_CLASS_HWMON,
cdaf7934 149 .driver = {
cdaf7934
LR		 150 .name = "lm80",
151 },
8c8bacc8 152 .probe = lm80_probe,
8c8bacc8
JD		 153 .id_table = lm80_id,
154 .detect = lm80_detect,
c3813d6a 155 .address_list = normal_i2c,
1da177e4
LT		 156};
157
158/*
159 * Sysfs stuff
160 */
161
162#define show_in(suffix, value) \
66b3b1f7
FM		 163static ssize_t show_in_##suffix(struct device *dev, \
164 struct device_attribute *attr, char *buf) \
1da177e4 165{ \
f8181762 166 int nr = to_sensor_dev_attr(attr)->index; \
1da177e4 167 struct lm80_data *data = lm80_update_device(dev); \
2faaa931
FM		 168 if (IS_ERR(data)) \
169 return PTR_ERR(data); \
f8181762 170 return sprintf(buf, "%d\n", IN_FROM_REG(data->value[nr])); \
1da177e4 171}
f8181762
JD		 172show_in(min, in_min)
173show_in(max, in_max)
174show_in(input, in)
1da177e4
LT		 175
176#define set_in(suffix, value, reg) \
66b3b1f7
FM		 177static ssize_t set_in_##suffix(struct device *dev, \
178 struct device_attribute *attr, const char *buf, size_t count) \
1da177e4 179{ \
f8181762 180 int nr = to_sensor_dev_attr(attr)->index; \
118c9a61
GR		 181 struct lm80_data *data = dev_get_drvdata(dev); \
182 struct i2c_client *client = data->client; \
6a9e7c4c
FM		 183 long val; \
184 int err = kstrtol(buf, 10, &val); \
185 if (err < 0) \
186 return err; \
66b3b1f7 187\
9a61bf63 188 mutex_lock(&data->update_lock);\
f8181762
JD		 189 data->value[nr] = IN_TO_REG(val); \
190 lm80_write_value(client, reg(nr), data->value[nr]); \
9a61bf63 191 mutex_unlock(&data->update_lock);\
1da177e4
LT		 192 return count; \
193}
f8181762
JD		 194set_in(min, in_min, LM80_REG_IN_MIN)
195set_in(max, in_max, LM80_REG_IN_MAX)
196
197#define show_fan(suffix, value) \
66b3b1f7
FM		 198static ssize_t show_fan_##suffix(struct device *dev, \
199 struct device_attribute *attr, char *buf) \
1da177e4 200{ \
f8181762 201 int nr = to_sensor_dev_attr(attr)->index; \
1da177e4 202 struct lm80_data *data = lm80_update_device(dev); \
2faaa931
FM		 203 if (IS_ERR(data)) \
204 return PTR_ERR(data); \
f8181762
JD		 205 return sprintf(buf, "%d\n", FAN_FROM_REG(data->value[nr], \
206 DIV_FROM_REG(data->fan_div[nr]))); \
1da177e4 207}
f8181762
JD		 208show_fan(min, fan_min)
209show_fan(input, fan)
1da177e4 210
f8181762
JD		 211static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr,
212 char *buf)
213{
214 int nr = to_sensor_dev_attr(attr)->index;
215 struct lm80_data *data = lm80_update_device(dev);
2faaa931
FM		 216 if (IS_ERR(data))
217 return PTR_ERR(data);
f8181762 218 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
1da177e4 219}
1da177e4 220
f8181762
JD		 221static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
222 const char *buf, size_t count)
223{
224 int nr = to_sensor_dev_attr(attr)->index;
118c9a61
GR		 225 struct lm80_data *data = dev_get_drvdata(dev);
226 struct i2c_client *client = data->client;
6a9e7c4c
FM		 227 unsigned long val;
228 int err = kstrtoul(buf, 10, &val);
229 if (err < 0)
230 return err;
f8181762
JD		 231
232 mutex_lock(&data->update_lock);
233 data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
234 lm80_write_value(client, LM80_REG_FAN_MIN(nr + 1), data->fan_min[nr]);
235 mutex_unlock(&data->update_lock);
236 return count;
1da177e4 237}
1da177e4 238
1160631b
GR		 239/*
240 * Note: we save and restore the fan minimum here, because its value is
241 * determined in part by the fan divisor. This follows the principle of
242 * least surprise; the user doesn't expect the fan minimum to change just
243 * because the divisor changed.
244 */
f8181762
JD		 245static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
246 const char *buf, size_t count)
1da177e4 247{
f8181762 248 int nr = to_sensor_dev_attr(attr)->index;
118c9a61
GR		 249 struct lm80_data *data = dev_get_drvdata(dev);
250 struct i2c_client *client = data->client;
6a9e7c4c 251 unsigned long min, val;
1da177e4 252 u8 reg;
6a9e7c4c
FM		 253 int err = kstrtoul(buf, 10, &val);
254 if (err < 0)
255 return err;
1da177e4
LT		 256
257 /* Save fan_min */
9a61bf63 258 mutex_lock(&data->update_lock);
1da177e4
LT		 259 min = FAN_FROM_REG(data->fan_min[nr],
260 DIV_FROM_REG(data->fan_div[nr]));
261
262 switch (val) {
66b3b1f7
FM		 263 case 1:
264 data->fan_div[nr] = 0;
265 break;
266 case 2:
267 data->fan_div[nr] = 1;
268 break;
269 case 4:
270 data->fan_div[nr] = 2;
271 break;
272 case 8:
273 data->fan_div[nr] = 3;
274 break;
1da177e4 275 default:
118c9a61 276 dev_err(dev,
b55f3757
GR		 277 "fan_div value %ld not supported. Choose one of 1, 2, 4 or 8!\n",
278 val);
9a61bf63 279 mutex_unlock(&data->update_lock);
1da177e4
LT		 280 return -EINVAL;
281 }
282
283 reg = (lm80_read_value(client, LM80_REG_FANDIV) & ~(3 << (2 * (nr + 1))))
284 | (data->fan_div[nr] << (2 * (nr + 1)));
285 lm80_write_value(client, LM80_REG_FANDIV, reg);
286
287 /* Restore fan_min */
288 data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
289 lm80_write_value(client, LM80_REG_FAN_MIN(nr + 1), data->fan_min[nr]);
9a61bf63 290 mutex_unlock(&data->update_lock);
1da177e4
LT		 291
292 return count;
293}
294
66b3b1f7
FM		 295static ssize_t show_temp_input1(struct device *dev,
296 struct device_attribute *attr, char *buf)
1da177e4
LT		 297{
298 struct lm80_data *data = lm80_update_device(dev);
2faaa931
FM		 299 if (IS_ERR(data))
300 return PTR_ERR(data);
9028ff8e 301 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp));
1da177e4
LT		 302}
303
304#define show_temp(suffix, value) \
66b3b1f7
FM		 305static ssize_t show_temp_##suffix(struct device *dev, \
306 struct device_attribute *attr, char *buf) \
1da177e4
LT		 307{ \
308 struct lm80_data *data = lm80_update_device(dev); \
2faaa931
FM		 309 if (IS_ERR(data)) \
310 return PTR_ERR(data); \
1da177e4
LT		 311 return sprintf(buf, "%d\n", TEMP_LIMIT_FROM_REG(data->value)); \
312}
313show_temp(hot_max, temp_hot_max);
314show_temp(hot_hyst, temp_hot_hyst);
315show_temp(os_max, temp_os_max);
316show_temp(os_hyst, temp_os_hyst);
317
318#define set_temp(suffix, value, reg) \
66b3b1f7
FM		 319static ssize_t set_temp_##suffix(struct device *dev, \
320 struct device_attribute *attr, const char *buf, size_t count) \
1da177e4 321{ \
118c9a61
GR		 322 struct lm80_data *data = dev_get_drvdata(dev); \
323 struct i2c_client *client = data->client; \
6a9e7c4c
FM		 324 long val; \
325 int err = kstrtol(buf, 10, &val); \
326 if (err < 0) \
327 return err; \
66b3b1f7 328\
9a61bf63 329 mutex_lock(&data->update_lock); \
1da177e4
LT		 330 data->value = TEMP_LIMIT_TO_REG(val); \
331 lm80_write_value(client, reg, data->value); \
9a61bf63 332 mutex_unlock(&data->update_lock); \
1da177e4
LT		 333 return count; \
334}
335set_temp(hot_max, temp_hot_max, LM80_REG_TEMP_HOT_MAX);
336set_temp(hot_hyst, temp_hot_hyst, LM80_REG_TEMP_HOT_HYST);
337set_temp(os_max, temp_os_max, LM80_REG_TEMP_OS_MAX);
338set_temp(os_hyst, temp_os_hyst, LM80_REG_TEMP_OS_HYST);
339
6cc37ee5
JD		 340static ssize_t show_alarms(struct device *dev, struct device_attribute *attr,
341 char *buf)
1da177e4
LT		 342{
343 struct lm80_data *data = lm80_update_device(dev);
2faaa931
FM		 344 if (IS_ERR(data))
345 return PTR_ERR(data);
1da177e4
LT		 346 return sprintf(buf, "%u\n", data->alarms);
347}
348
e84542f5
JD		 349static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
350 char *buf)
351{
352 int bitnr = to_sensor_dev_attr(attr)->index;
353 struct lm80_data *data = lm80_update_device(dev);
2faaa931
FM		 354 if (IS_ERR(data))
355 return PTR_ERR(data);
e84542f5
JD		 356 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
357}
358
f8181762
JD		 359static SENSOR_DEVICE_ATTR(in0_min, S_IWUSR | S_IRUGO,
360 show_in_min, set_in_min, 0);
361static SENSOR_DEVICE_ATTR(in1_min, S_IWUSR | S_IRUGO,
362 show_in_min, set_in_min, 1);
363static SENSOR_DEVICE_ATTR(in2_min, S_IWUSR | S_IRUGO,
364 show_in_min, set_in_min, 2);
365static SENSOR_DEVICE_ATTR(in3_min, S_IWUSR | S_IRUGO,
366 show_in_min, set_in_min, 3);
367static SENSOR_DEVICE_ATTR(in4_min, S_IWUSR | S_IRUGO,
368 show_in_min, set_in_min, 4);
369static SENSOR_DEVICE_ATTR(in5_min, S_IWUSR | S_IRUGO,
370 show_in_min, set_in_min, 5);
371static SENSOR_DEVICE_ATTR(in6_min, S_IWUSR | S_IRUGO,
372 show_in_min, set_in_min, 6);
373static SENSOR_DEVICE_ATTR(in0_max, S_IWUSR | S_IRUGO,
374 show_in_max, set_in_max, 0);
375static SENSOR_DEVICE_ATTR(in1_max, S_IWUSR | S_IRUGO,
376 show_in_max, set_in_max, 1);
377static SENSOR_DEVICE_ATTR(in2_max, S_IWUSR | S_IRUGO,
378 show_in_max, set_in_max, 2);
379static SENSOR_DEVICE_ATTR(in3_max, S_IWUSR | S_IRUGO,
380 show_in_max, set_in_max, 3);
381static SENSOR_DEVICE_ATTR(in4_max, S_IWUSR | S_IRUGO,
382 show_in_max, set_in_max, 4);
383static SENSOR_DEVICE_ATTR(in5_max, S_IWUSR | S_IRUGO,
384 show_in_max, set_in_max, 5);
385static SENSOR_DEVICE_ATTR(in6_max, S_IWUSR | S_IRUGO,
386 show_in_max, set_in_max, 6);
387static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, show_in_input, NULL, 0);
388static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_in_input, NULL, 1);
389static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_in_input, NULL, 2);
390static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_in_input, NULL, 3);
391static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_in_input, NULL, 4);
392static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, show_in_input, NULL, 5);
393static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, show_in_input, NULL, 6);
394static SENSOR_DEVICE_ATTR(fan1_min, S_IWUSR | S_IRUGO,
395 show_fan_min, set_fan_min, 0);
396static SENSOR_DEVICE_ATTR(fan2_min, S_IWUSR | S_IRUGO,
397 show_fan_min, set_fan_min, 1);
398static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input, NULL, 0);
399static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input, NULL, 1);
400static SENSOR_DEVICE_ATTR(fan1_div, S_IWUSR | S_IRUGO,
401 show_fan_div, set_fan_div, 0);
402static SENSOR_DEVICE_ATTR(fan2_div, S_IWUSR | S_IRUGO,
403 show_fan_div, set_fan_div, 1);
1da177e4
LT		 404static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
405static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_hot_max,
66b3b1f7 406 set_temp_hot_max);
1da177e4 407static DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, show_temp_hot_hyst,
66b3b1f7 408 set_temp_hot_hyst);
1da177e4 409static DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp_os_max,
66b3b1f7 410 set_temp_os_max);
1da177e4 411static DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temp_os_hyst,
66b3b1f7 412 set_temp_os_hyst);
1da177e4 413static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
e84542f5
JD		 414static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
415static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
416static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
417static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
418static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 4);
419static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 5);
420static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 6);
421static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 10);
422static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 11);
423static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 8);
424static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 13);
1da177e4
LT		 425
426/*
427 * Real code
428 */
429
118c9a61 430static struct attribute *lm80_attrs[] = {
f8181762
JD		 431 &sensor_dev_attr_in0_min.dev_attr.attr,
432 &sensor_dev_attr_in1_min.dev_attr.attr,
433 &sensor_dev_attr_in2_min.dev_attr.attr,
434 &sensor_dev_attr_in3_min.dev_attr.attr,
435 &sensor_dev_attr_in4_min.dev_attr.attr,
436 &sensor_dev_attr_in5_min.dev_attr.attr,
437 &sensor_dev_attr_in6_min.dev_attr.attr,
438 &sensor_dev_attr_in0_max.dev_attr.attr,
439 &sensor_dev_attr_in1_max.dev_attr.attr,
440 &sensor_dev_attr_in2_max.dev_attr.attr,
441 &sensor_dev_attr_in3_max.dev_attr.attr,
442 &sensor_dev_attr_in4_max.dev_attr.attr,
443 &sensor_dev_attr_in5_max.dev_attr.attr,
444 &sensor_dev_attr_in6_max.dev_attr.attr,
445 &sensor_dev_attr_in0_input.dev_attr.attr,
446 &sensor_dev_attr_in1_input.dev_attr.attr,
447 &sensor_dev_attr_in2_input.dev_attr.attr,
448 &sensor_dev_attr_in3_input.dev_attr.attr,
449 &sensor_dev_attr_in4_input.dev_attr.attr,
450 &sensor_dev_attr_in5_input.dev_attr.attr,
451 &sensor_dev_attr_in6_input.dev_attr.attr,
452 &sensor_dev_attr_fan1_min.dev_attr.attr,
453 &sensor_dev_attr_fan2_min.dev_attr.attr,
454 &sensor_dev_attr_fan1_input.dev_attr.attr,
455 &sensor_dev_attr_fan2_input.dev_attr.attr,
456 &sensor_dev_attr_fan1_div.dev_attr.attr,
457 &sensor_dev_attr_fan2_div.dev_attr.attr,
0501a381
MH		 458 &dev_attr_temp1_input.attr,
459 &dev_attr_temp1_max.attr,
460 &dev_attr_temp1_max_hyst.attr,
461 &dev_attr_temp1_crit.attr,
462 &dev_attr_temp1_crit_hyst.attr,
463 &dev_attr_alarms.attr,
e84542f5
JD		 464 &sensor_dev_attr_in0_alarm.dev_attr.attr,
465 &sensor_dev_attr_in1_alarm.dev_attr.attr,
466 &sensor_dev_attr_in2_alarm.dev_attr.attr,
467 &sensor_dev_attr_in3_alarm.dev_attr.attr,
468 &sensor_dev_attr_in4_alarm.dev_attr.attr,
469 &sensor_dev_attr_in5_alarm.dev_attr.attr,
470 &sensor_dev_attr_in6_alarm.dev_attr.attr,
471 &sensor_dev_attr_fan1_alarm.dev_attr.attr,
472 &sensor_dev_attr_fan2_alarm.dev_attr.attr,
473 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
474 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
0501a381
MH		 475 NULL
476};
118c9a61 477ATTRIBUTE_GROUPS(lm80);
0501a381 478
8c8bacc8 479/* Return 0 if detection is successful, -ENODEV otherwise */
310ec792 480static int lm80_detect(struct i2c_client *client, struct i2c_board_info *info)
1da177e4 481{
8c8bacc8 482 struct i2c_adapter *adapter = client->adapter;
9908ad4c
JD		 483 int i, cur, man_id, dev_id;
484 const char *name = NULL;
1da177e4
LT		 485
486 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
8c8bacc8 487 return -ENODEV;
1da177e4 488
9908ad4c
JD		 489 /* First check for unused bits, common to both chip types */
490 if ((lm80_read_value(client, LM80_REG_ALARM2) & 0xc0)
491 || (lm80_read_value(client, LM80_REG_CONFIG) & 0x80))
8c8bacc8 492 return -ENODEV;
9908ad4c
JD		 493
494 /*
495 * The LM96080 has manufacturer and stepping/die rev registers so we
496 * can just check that. The LM80 does not have such registers so we
497 * have to use a more expensive trick.
498 */
499 man_id = lm80_read_value(client, LM96080_REG_MAN_ID);
500 dev_id = lm80_read_value(client, LM96080_REG_DEV_ID);
501 if (man_id == 0x01 && dev_id == 0x08) {
502 /* Check more unused bits for confirmation */
503 if (lm80_read_value(client, LM96080_REG_CONV_RATE) & 0xfe)
66b3b1f7 504 return -ENODEV;
9908ad4c
JD		 505
506 name = "lm96080";
507 } else {
508 /* Check 6-bit addressing */
509 for (i = 0x2a; i <= 0x3d; i++) {
510 cur = i2c_smbus_read_byte_data(client, i);
511 if ((i2c_smbus_read_byte_data(client, i + 0x40) != cur)
512 || (i2c_smbus_read_byte_data(client, i + 0x80) != cur)
513 || (i2c_smbus_read_byte_data(client, i + 0xc0) != cur))
514 return -ENODEV;
515 }
516
517 name = "lm80";
1da177e4
LT		 518 }
519
9908ad4c 520 strlcpy(info->type, name, I2C_NAME_SIZE);
1da177e4 521
8c8bacc8
JD		 522 return 0;
523}
1da177e4 524
8c8bacc8
JD		 525static int lm80_probe(struct i2c_client *client,
526 const struct i2c_device_id *id)
527{
118c9a61
GR		 528 struct device *dev = &client->dev;
529 struct device *hwmon_dev;
8c8bacc8 530 struct lm80_data *data;
8c8bacc8 531
118c9a61 532 data = devm_kzalloc(dev, sizeof(struct lm80_data), GFP_KERNEL);
c38b2820
GR		 533 if (!data)
534 return -ENOMEM;
8c8bacc8 535
118c9a61 536 data->client = client;
8c8bacc8 537 mutex_init(&data->update_lock);
1da177e4
LT		 538
539 /* Initialize the LM80 chip */
6cc37ee5 540 lm80_init_client(client);
1da177e4
LT		 541
542 /* A few vars need to be filled upon startup */
6cc37ee5
JD		 543 data->fan_min[0] = lm80_read_value(client, LM80_REG_FAN_MIN(1));
544 data->fan_min[1] = lm80_read_value(client, LM80_REG_FAN_MIN(2));
1da177e4 545
118c9a61
GR		 546 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
547 data, lm80_groups);
943b0830 548
118c9a61 549 return PTR_ERR_OR_ZERO(hwmon_dev);
1da177e4
LT		 550}
551
552static int lm80_read_value(struct i2c_client *client, u8 reg)
553{
554 return i2c_smbus_read_byte_data(client, reg);
555}
556
557static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value)
558{
559 return i2c_smbus_write_byte_data(client, reg, value);
560}
561
562/* Called when we have found a new LM80. */
563static void lm80_init_client(struct i2c_client *client)
564{
1160631b
GR		 565 /*
566 * Reset all except Watchdog values and last conversion values
567 * This sets fan-divs to 2, among others. This makes most other
568 * initializations unnecessary
569 */
1da177e4
LT		 570 lm80_write_value(client, LM80_REG_CONFIG, 0x80);
571 /* Set 11-bit temperature resolution */
572 lm80_write_value(client, LM80_REG_RES, 0x08);
573
574 /* Start monitoring */
575 lm80_write_value(client, LM80_REG_CONFIG, 0x01);
576}
577
578static struct lm80_data *lm80_update_device(struct device *dev)
579{
118c9a61
GR		 580 struct lm80_data *data = dev_get_drvdata(dev);
581 struct i2c_client *client = data->client;
1da177e4 582 int i;
2faaa931
FM		 583 int rv;
584 int prev_rv;
585 struct lm80_data *ret = data;
1da177e4 586
9a61bf63 587 mutex_lock(&data->update_lock);
1da177e4 588
96585f1a
FM		 589 if (data->error)
590 lm80_init_client(client);
591
1da177e4 592 if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
118c9a61 593 dev_dbg(dev, "Starting lm80 update\n");
1da177e4 594 for (i = 0; i <= 6; i++) {
2faaa931
FM		 595 rv = lm80_read_value(client, LM80_REG_IN(i));
596 if (rv < 0)
597 goto abort;
598 data->in[i] = rv;
599
600 rv = lm80_read_value(client, LM80_REG_IN_MIN(i));
601 if (rv < 0)
602 goto abort;
603 data->in_min[i] = rv;
604
605 rv = lm80_read_value(client, LM80_REG_IN_MAX(i));
606 if (rv < 0)
607 goto abort;
608 data->in_max[i] = rv;
1da177e4 609 }
2faaa931
FM		 610
611 rv = lm80_read_value(client, LM80_REG_FAN1);
612 if (rv < 0)
613 goto abort;
614 data->fan[0] = rv;
615
616 rv = lm80_read_value(client, LM80_REG_FAN_MIN(1));
617 if (rv < 0)
618 goto abort;
619 data->fan_min[0] = rv;
620
621 rv = lm80_read_value(client, LM80_REG_FAN2);
622 if (rv < 0)
623 goto abort;
624 data->fan[1] = rv;
625
626 rv = lm80_read_value(client, LM80_REG_FAN_MIN(2));
627 if (rv < 0)
628 goto abort;
629 data->fan_min[1] = rv;
630
631 prev_rv = rv = lm80_read_value(client, LM80_REG_TEMP);
632 if (rv < 0)
633 goto abort;
634 rv = lm80_read_value(client, LM80_REG_RES);
635 if (rv < 0)
636 goto abort;
637 data->temp = (prev_rv << 8) | (rv & 0xf0);
638
639 rv = lm80_read_value(client, LM80_REG_TEMP_OS_MAX);
640 if (rv < 0)
641 goto abort;
642 data->temp_os_max = rv;
643
644 rv = lm80_read_value(client, LM80_REG_TEMP_OS_HYST);
645 if (rv < 0)
646 goto abort;
647 data->temp_os_hyst = rv;
648
649 rv = lm80_read_value(client, LM80_REG_TEMP_HOT_MAX);
650 if (rv < 0)
651 goto abort;
652 data->temp_hot_max = rv;
653
654 rv = lm80_read_value(client, LM80_REG_TEMP_HOT_HYST);
655 if (rv < 0)
656 goto abort;
657 data->temp_hot_hyst = rv;
658
659 rv = lm80_read_value(client, LM80_REG_FANDIV);
660 if (rv < 0)
661 goto abort;
662 data->fan_div[0] = (rv >> 2) & 0x03;
663 data->fan_div[1] = (rv >> 4) & 0x03;
664
665 prev_rv = rv = lm80_read_value(client, LM80_REG_ALARM1);
666 if (rv < 0)
667 goto abort;
668 rv = lm80_read_value(client, LM80_REG_ALARM2);
669 if (rv < 0)
670 goto abort;
671 data->alarms = prev_rv + (rv << 8);
672
1da177e4
LT		 673 data->last_updated = jiffies;
674 data->valid = 1;
96585f1a 675 data->error = 0;
1da177e4 676 }
2faaa931
FM		 677 goto done;
678
679abort:
680 ret = ERR_PTR(rv);
681 data->valid = 0;
96585f1a 682 data->error = 1;
1da177e4 683
2faaa931 684done:
9a61bf63 685 mutex_unlock(&data->update_lock);
1da177e4 686
2faaa931 687 return ret;
1da177e4
LT		 688}
689
f0967eea 690module_i2c_driver(lm80_driver);
1da177e4
LT		 691
692MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
693 "Philip Edelbrock <phil@netroedge.com>");
694MODULE_DESCRIPTION("LM80 driver");
695MODULE_LICENSE("GPL");
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