blob: 3eb4281689b565d3796a7ae82ee5ed4bd45b4773 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Guenter Roeck21d2a8f2012-01-14 12:45:47 -08002 * 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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070021
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/module.h>
23#include <linux/init.h>
24#include <linux/slab.h>
25#include <linux/jiffies.h>
26#include <linux/i2c.h>
Mark M. Hoffman943b0832005-07-15 21:39:18 -040027#include <linux/hwmon.h>
Krzysztof Helta8d6646e2007-09-09 19:51:14 +020028#include <linux/hwmon-sysfs.h>
Mark M. Hoffman943b0832005-07-15 21:39:18 -040029#include <linux/err.h>
Ingo Molnar9a61bf62006-01-18 23:19:26 +010030#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031
32
33/* Addresses to scan */
Mark M. Hoffman25e9c862008-02-17 22:28:03 -050034static const unsigned short normal_i2c[] = {
35 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
Jean Delvaree5e9f442009-12-14 21:17:27 +010037enum chips {
38 adm1021, adm1023, max1617, max1617a, thmc10, lm84, gl523sm, mc1066 };
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
40/* adm1021 constants specified below */
41
42/* The adm1021 registers */
43/* Read-only */
Krzysztof Helta8d6646e2007-09-09 19:51:14 +020044/* For nr in 0-1 */
45#define ADM1021_REG_TEMP(nr) (nr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070046#define ADM1021_REG_STATUS 0x02
Krzysztof Heltc83c41e2007-07-19 08:00:17 +020047/* 0x41 = AD, 0x49 = TI, 0x4D = Maxim, 0x23 = Genesys , 0x54 = Onsemi */
48#define ADM1021_REG_MAN_ID 0xFE
49/* ADM1021 = 0x0X, ADM1023 = 0x3X */
50#define ADM1021_REG_DEV_ID 0xFF
Linus Torvalds1da177e2005-04-16 15:20:36 -070051/* 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 */
Krzysztof Heltc83c41e2007-07-19 08:00:17 +020057#define ADM1023_REG_REM_TEMP_PREC 0x10
58#define ADM1023_REG_REM_OFFSET 0x11
59#define ADM1023_REG_REM_OFFSET_PREC 0x12
60#define ADM1023_REG_REM_TOS_PREC 0x13
61#define ADM1023_REG_REM_THYST_PREC 0x14
Linus Torvalds1da177e2005-04-16 15:20:36 -070062/* limits */
Krzysztof Helta8d6646e2007-09-09 19:51:14 +020063/* For nr in 0-1 */
64#define ADM1021_REG_TOS_R(nr) (0x05 + 2 * (nr))
65#define ADM1021_REG_TOS_W(nr) (0x0B + 2 * (nr))
66#define ADM1021_REG_THYST_R(nr) (0x06 + 2 * (nr))
67#define ADM1021_REG_THYST_W(nr) (0x0C + 2 * (nr))
Linus Torvalds1da177e2005-04-16 15:20:36 -070068/* write-only */
69#define ADM1021_REG_ONESHOT 0x0F
70
Linus Torvalds1da177e2005-04-16 15:20:36 -070071/* Initial values */
72
Guenter Roeck21d2a8f2012-01-14 12:45:47 -080073/*
74 * Note: Even though I left the low and high limits named os and hyst,
75 * they don't quite work like a thermostat the way the LM75 does. I.e.,
76 * a lower temp than THYST actually triggers an alarm instead of
77 * clearing it. Weird, ey? --Phil
78 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070079
80/* Each client has this additional data */
81struct adm1021_data {
Guenter Roeckc669ec82014-04-04 18:01:34 +020082 struct i2c_client *client;
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 enum chips type;
84
Guenter Roeckc669ec82014-04-04 18:01:34 +020085 const struct attribute_group *groups[3];
86
Ingo Molnar9a61bf62006-01-18 23:19:26 +010087 struct mutex update_lock;
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 char valid; /* !=0 if following fields are valid */
Michael Abbott905ffdc2009-09-21 17:04:47 -070089 char low_power; /* !=0 if device in low power mode */
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 unsigned long last_updated; /* In jiffies */
91
Michael Abbottf2668892009-09-21 17:04:46 -070092 int temp_max[2]; /* Register values */
93 int temp_min[2];
94 int temp[2];
Krzysztof Helta8d6646e2007-09-09 19:51:14 +020095 u8 alarms;
96 /* Special values for ADM1023 only */
Krzysztof Helta8d6646e2007-09-09 19:51:14 +020097 u8 remote_temp_offset;
98 u8 remote_temp_offset_prec;
Linus Torvalds1da177e2005-04-16 15:20:36 -070099};
100
Jean Delvare65817ed2008-07-16 19:30:08 +0200101static int adm1021_probe(struct i2c_client *client,
102 const struct i2c_device_id *id);
Jean Delvare310ec792009-12-14 21:17:23 +0100103static int adm1021_detect(struct i2c_client *client,
Jean Delvare65817ed2008-07-16 19:30:08 +0200104 struct i2c_board_info *info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105static void adm1021_init_client(struct i2c_client *client);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106static struct adm1021_data *adm1021_update_device(struct device *dev);
107
108/* (amalysh) read only mode, otherwise any limit's writing confuse BIOS */
Rusty Russell90ab5ee2012-01-13 09:32:20 +1030109static bool read_only;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110
111
Jean Delvare65817ed2008-07-16 19:30:08 +0200112static const struct i2c_device_id adm1021_id[] = {
113 { "adm1021", adm1021 },
114 { "adm1023", adm1023 },
115 { "max1617", max1617 },
116 { "max1617a", max1617a },
117 { "thmc10", thmc10 },
118 { "lm84", lm84 },
119 { "gl523sm", gl523sm },
120 { "mc1066", mc1066 },
121 { }
122};
123MODULE_DEVICE_TABLE(i2c, adm1021_id);
124
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125/* This is the driver that will be inserted */
126static struct i2c_driver adm1021_driver = {
Jean Delvare65817ed2008-07-16 19:30:08 +0200127 .class = I2C_CLASS_HWMON,
Laurent Riffardcdaf7932005-11-26 20:37:41 +0100128 .driver = {
Laurent Riffardcdaf7932005-11-26 20:37:41 +0100129 .name = "adm1021",
130 },
Jean Delvare65817ed2008-07-16 19:30:08 +0200131 .probe = adm1021_probe,
Jean Delvare65817ed2008-07-16 19:30:08 +0200132 .id_table = adm1021_id,
133 .detect = adm1021_detect,
Jean Delvarec3813d62009-12-14 21:17:25 +0100134 .address_list = normal_i2c,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135};
136
Krzysztof Helta8d6646e2007-09-09 19:51:14 +0200137static ssize_t show_temp(struct device *dev,
138 struct device_attribute *devattr, char *buf)
139{
140 int index = to_sensor_dev_attr(devattr)->index;
141 struct adm1021_data *data = adm1021_update_device(dev);
142
Michael Abbottf2668892009-09-21 17:04:46 -0700143 return sprintf(buf, "%d\n", data->temp[index]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144}
Krzysztof Helta8d6646e2007-09-09 19:51:14 +0200145
146static ssize_t show_temp_max(struct device *dev,
147 struct device_attribute *devattr, char *buf)
148{
149 int index = to_sensor_dev_attr(devattr)->index;
150 struct adm1021_data *data = adm1021_update_device(dev);
151
Michael Abbottf2668892009-09-21 17:04:46 -0700152 return sprintf(buf, "%d\n", data->temp_max[index]);
Krzysztof Helta8d6646e2007-09-09 19:51:14 +0200153}
154
155static ssize_t show_temp_min(struct device *dev,
156 struct device_attribute *devattr, char *buf)
157{
158 int index = to_sensor_dev_attr(devattr)->index;
159 struct adm1021_data *data = adm1021_update_device(dev);
160
Michael Abbottf2668892009-09-21 17:04:46 -0700161 return sprintf(buf, "%d\n", data->temp_min[index]);
Krzysztof Helta8d6646e2007-09-09 19:51:14 +0200162}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163
Krzysztof Helt739ba242007-09-09 19:16:03 +0200164static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
165 char *buf)
166{
167 int index = to_sensor_dev_attr(attr)->index;
168 struct adm1021_data *data = adm1021_update_device(dev);
169 return sprintf(buf, "%u\n", (data->alarms >> index) & 1);
170}
171
Krzysztof Heltc83c41e2007-07-19 08:00:17 +0200172static ssize_t show_alarms(struct device *dev,
173 struct device_attribute *attr,
174 char *buf)
175{
176 struct adm1021_data *data = adm1021_update_device(dev);
177 return sprintf(buf, "%u\n", data->alarms);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179
Krzysztof Helta8d6646e2007-09-09 19:51:14 +0200180static ssize_t set_temp_max(struct device *dev,
181 struct device_attribute *devattr,
182 const char *buf, size_t count)
183{
184 int index = to_sensor_dev_attr(devattr)->index;
Guenter Roeckc669ec82014-04-04 18:01:34 +0200185 struct adm1021_data *data = dev_get_drvdata(dev);
186 struct i2c_client *client = data->client;
Guenter Roeck21d2a8f2012-01-14 12:45:47 -0800187 long temp;
188 int err;
189
190 err = kstrtol(buf, 10, &temp);
191 if (err)
192 return err;
193 temp /= 1000;
Krzysztof Helta8d6646e2007-09-09 19:51:14 +0200194
195 mutex_lock(&data->update_lock);
Guenter Roeck2a844c12013-01-09 08:09:34 -0800196 data->temp_max[index] = clamp_val(temp, -128, 127);
Krzysztof Helta8d6646e2007-09-09 19:51:14 +0200197 if (!read_only)
198 i2c_smbus_write_byte_data(client, ADM1021_REG_TOS_W(index),
199 data->temp_max[index]);
200 mutex_unlock(&data->update_lock);
201
202 return count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204
Krzysztof Helta8d6646e2007-09-09 19:51:14 +0200205static ssize_t set_temp_min(struct device *dev,
206 struct device_attribute *devattr,
207 const char *buf, size_t count)
208{
209 int index = to_sensor_dev_attr(devattr)->index;
Guenter Roeckc669ec82014-04-04 18:01:34 +0200210 struct adm1021_data *data = dev_get_drvdata(dev);
211 struct i2c_client *client = data->client;
Guenter Roeck21d2a8f2012-01-14 12:45:47 -0800212 long temp;
213 int err;
214
215 err = kstrtol(buf, 10, &temp);
216 if (err)
217 return err;
218 temp /= 1000;
Krzysztof Helta8d6646e2007-09-09 19:51:14 +0200219
220 mutex_lock(&data->update_lock);
Guenter Roeck2a844c12013-01-09 08:09:34 -0800221 data->temp_min[index] = clamp_val(temp, -128, 127);
Krzysztof Helta8d6646e2007-09-09 19:51:14 +0200222 if (!read_only)
223 i2c_smbus_write_byte_data(client, ADM1021_REG_THYST_W(index),
224 data->temp_min[index]);
225 mutex_unlock(&data->update_lock);
226
227 return count;
228}
229
Michael Abbott905ffdc2009-09-21 17:04:47 -0700230static ssize_t show_low_power(struct device *dev,
231 struct device_attribute *devattr, char *buf)
232{
233 struct adm1021_data *data = adm1021_update_device(dev);
234 return sprintf(buf, "%d\n", data->low_power);
235}
236
237static ssize_t set_low_power(struct device *dev,
238 struct device_attribute *devattr,
239 const char *buf, size_t count)
240{
Guenter Roeckc669ec82014-04-04 18:01:34 +0200241 struct adm1021_data *data = dev_get_drvdata(dev);
242 struct i2c_client *client = data->client;
Guenter Roeck21d2a8f2012-01-14 12:45:47 -0800243 char low_power;
244 unsigned long val;
245 int err;
246
247 err = kstrtoul(buf, 10, &val);
248 if (err)
249 return err;
250 low_power = val != 0;
Michael Abbott905ffdc2009-09-21 17:04:47 -0700251
252 mutex_lock(&data->update_lock);
253 if (low_power != data->low_power) {
254 int config = i2c_smbus_read_byte_data(
255 client, ADM1021_REG_CONFIG_R);
256 data->low_power = low_power;
257 i2c_smbus_write_byte_data(client, ADM1021_REG_CONFIG_W,
258 (config & 0xBF) | (low_power << 6));
259 }
260 mutex_unlock(&data->update_lock);
261
262 return count;
263}
264
265
Krzysztof Helta8d6646e2007-09-09 19:51:14 +0200266static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
267static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max,
268 set_temp_max, 0);
269static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp_min,
270 set_temp_min, 0);
271static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
272static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_max,
273 set_temp_max, 1);
274static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp_min,
275 set_temp_min, 1);
Krzysztof Helt739ba242007-09-09 19:16:03 +0200276static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
277static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 5);
278static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
279static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3);
280static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
281
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
Michael Abbott905ffdc2009-09-21 17:04:47 -0700283static DEVICE_ATTR(low_power, S_IWUSR | S_IRUGO, show_low_power, set_low_power);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284
Mark M. Hoffman681c6f72006-09-24 21:15:35 +0200285static struct attribute *adm1021_attributes[] = {
Krzysztof Helta8d6646e2007-09-09 19:51:14 +0200286 &sensor_dev_attr_temp1_max.dev_attr.attr,
Krzysztof Helta8d6646e2007-09-09 19:51:14 +0200287 &sensor_dev_attr_temp1_input.dev_attr.attr,
288 &sensor_dev_attr_temp2_max.dev_attr.attr,
Krzysztof Helta8d6646e2007-09-09 19:51:14 +0200289 &sensor_dev_attr_temp2_input.dev_attr.attr,
Krzysztof Helt739ba242007-09-09 19:16:03 +0200290 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
Krzysztof Helt739ba242007-09-09 19:16:03 +0200291 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
Krzysztof Helt739ba242007-09-09 19:16:03 +0200292 &sensor_dev_attr_temp2_fault.dev_attr.attr,
Mark M. Hoffman681c6f72006-09-24 21:15:35 +0200293 &dev_attr_alarms.attr,
Michael Abbott905ffdc2009-09-21 17:04:47 -0700294 &dev_attr_low_power.attr,
Mark M. Hoffman681c6f72006-09-24 21:15:35 +0200295 NULL
296};
297
298static const struct attribute_group adm1021_group = {
299 .attrs = adm1021_attributes,
300};
301
Guenter Roeck68146a52013-06-06 10:30:10 -0700302static struct attribute *adm1021_min_attributes[] = {
303 &sensor_dev_attr_temp1_min.dev_attr.attr,
304 &sensor_dev_attr_temp2_min.dev_attr.attr,
305 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
306 &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
307 NULL
308};
309
310static const struct attribute_group adm1021_min_group = {
311 .attrs = adm1021_min_attributes,
312};
313
Jean Delvare65817ed2008-07-16 19:30:08 +0200314/* Return 0 if detection is successful, -ENODEV otherwise */
Jean Delvare310ec792009-12-14 21:17:23 +0100315static int adm1021_detect(struct i2c_client *client,
Jean Delvare65817ed2008-07-16 19:30:08 +0200316 struct i2c_board_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317{
Jean Delvare65817ed2008-07-16 19:30:08 +0200318 struct i2c_adapter *adapter = client->adapter;
Jean Delvare8007ea32009-12-09 20:35:51 +0100319 const char *type_name;
320 int conv_rate, status, config, man_id, dev_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321
Krzysztof Heltc83c41e2007-07-19 08:00:17 +0200322 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
Guenter Roeckb55f3752013-01-10 10:01:24 -0800323 pr_debug("detect failed, smbus byte data not supported!\n");
Jean Delvare65817ed2008-07-16 19:30:08 +0200324 return -ENODEV;
Krzysztof Heltc83c41e2007-07-19 08:00:17 +0200325 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
Krzysztof Heltc83c41e2007-07-19 08:00:17 +0200327 status = i2c_smbus_read_byte_data(client, ADM1021_REG_STATUS);
328 conv_rate = i2c_smbus_read_byte_data(client,
329 ADM1021_REG_CONV_RATE_R);
330 config = i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331
Jean Delvare8007ea32009-12-09 20:35:51 +0100332 /* Check unused bits */
333 if ((status & 0x03) || (config & 0x3F) || (conv_rate & 0xF8)) {
Guenter Roeckb55f3752013-01-10 10:01:24 -0800334 pr_debug("detect failed, chip not detected!\n");
Jean Delvare8007ea32009-12-09 20:35:51 +0100335 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 }
337
338 /* Determine the chip type. */
Jean Delvare8007ea32009-12-09 20:35:51 +0100339 man_id = i2c_smbus_read_byte_data(client, ADM1021_REG_MAN_ID);
340 dev_id = i2c_smbus_read_byte_data(client, ADM1021_REG_DEV_ID);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341
Guenter Roeck591bfcf2013-06-05 14:09:30 -0700342 if (man_id < 0 || dev_id < 0)
343 return -ENODEV;
344
Jean Delvare8007ea32009-12-09 20:35:51 +0100345 if (man_id == 0x4d && dev_id == 0x01)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 type_name = "max1617a";
Jean Delvare8007ea32009-12-09 20:35:51 +0100347 else if (man_id == 0x41) {
348 if ((dev_id & 0xF0) == 0x30)
349 type_name = "adm1023";
Guenter Roeck591bfcf2013-06-05 14:09:30 -0700350 else if ((dev_id & 0xF0) == 0x00)
Jean Delvare8007ea32009-12-09 20:35:51 +0100351 type_name = "adm1021";
Guenter Roeck591bfcf2013-06-05 14:09:30 -0700352 else
353 return -ENODEV;
Jean Delvare8007ea32009-12-09 20:35:51 +0100354 } else if (man_id == 0x49)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 type_name = "thmc10";
Jean Delvare8007ea32009-12-09 20:35:51 +0100356 else if (man_id == 0x23)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 type_name = "gl523sm";
Jean Delvare8007ea32009-12-09 20:35:51 +0100358 else if (man_id == 0x54)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 type_name = "mc1066";
Guenter Roeck591bfcf2013-06-05 14:09:30 -0700360 else {
361 int lte, rte, lhi, rhi, llo, rlo;
362
363 /* extra checks for LM84 and MAX1617 to avoid misdetections */
364
365 llo = i2c_smbus_read_byte_data(client, ADM1021_REG_THYST_R(0));
366 rlo = i2c_smbus_read_byte_data(client, ADM1021_REG_THYST_R(1));
367
368 /* fail if any of the additional register reads failed */
369 if (llo < 0 || rlo < 0)
370 return -ENODEV;
371
372 lte = i2c_smbus_read_byte_data(client, ADM1021_REG_TEMP(0));
373 rte = i2c_smbus_read_byte_data(client, ADM1021_REG_TEMP(1));
374 lhi = i2c_smbus_read_byte_data(client, ADM1021_REG_TOS_R(0));
375 rhi = i2c_smbus_read_byte_data(client, ADM1021_REG_TOS_R(1));
376
377 /*
378 * Fail for negative temperatures and negative high limits.
379 * This check also catches read errors on the tested registers.
380 */
381 if ((s8)lte < 0 || (s8)rte < 0 || (s8)lhi < 0 || (s8)rhi < 0)
382 return -ENODEV;
383
384 /* fail if all registers hold the same value */
385 if (lte == rte && lte == lhi && lte == rhi && lte == llo
386 && lte == rlo)
387 return -ENODEV;
388
389 /*
390 * LM84 Mfr ID is in a different place,
391 * and it has more unused bits.
392 */
393 if (conv_rate == 0x00
394 && (config & 0x7F) == 0x00
395 && (status & 0xAB) == 0x00) {
396 type_name = "lm84";
397 } else {
398 /* fail if low limits are larger than high limits */
399 if ((s8)llo > lhi || (s8)rlo > rhi)
400 return -ENODEV;
401 type_name = "max1617";
402 }
403 }
Jean Delvare8007ea32009-12-09 20:35:51 +0100404
Guenter Roeckb55f3752013-01-10 10:01:24 -0800405 pr_debug("Detected chip %s at adapter %d, address 0x%02x.\n",
Jean Delvare65817ed2008-07-16 19:30:08 +0200406 type_name, i2c_adapter_id(adapter), client->addr);
407 strlcpy(info->type, type_name, I2C_NAME_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408
Jean Delvare65817ed2008-07-16 19:30:08 +0200409 return 0;
410}
411
412static int adm1021_probe(struct i2c_client *client,
413 const struct i2c_device_id *id)
414{
Guenter Roeckc669ec82014-04-04 18:01:34 +0200415 struct device *dev = &client->dev;
Jean Delvare65817ed2008-07-16 19:30:08 +0200416 struct adm1021_data *data;
Guenter Roeckc669ec82014-04-04 18:01:34 +0200417 struct device *hwmon_dev;
Jean Delvare65817ed2008-07-16 19:30:08 +0200418
Guenter Roeckc669ec82014-04-04 18:01:34 +0200419 data = devm_kzalloc(dev, sizeof(struct adm1021_data), GFP_KERNEL);
Guenter Roeckb55f3752013-01-10 10:01:24 -0800420 if (!data)
Guenter Roeck06ce97d2012-06-02 09:57:58 -0700421 return -ENOMEM;
Jean Delvare65817ed2008-07-16 19:30:08 +0200422
Guenter Roeckc669ec82014-04-04 18:01:34 +0200423 data->client = client;
Jean Delvare65817ed2008-07-16 19:30:08 +0200424 data->type = id->driver_data;
Ingo Molnar9a61bf62006-01-18 23:19:26 +0100425 mutex_init(&data->update_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 /* Initialize the ADM1021 chip */
Jean Delvare65817ed2008-07-16 19:30:08 +0200428 if (data->type != lm84 && !read_only)
Krzysztof Heltc83c41e2007-07-19 08:00:17 +0200429 adm1021_init_client(client);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430
Guenter Roeckc669ec82014-04-04 18:01:34 +0200431 data->groups[0] = &adm1021_group;
432 if (data->type != lm84)
433 data->groups[1] = &adm1021_min_group;
Mark M. Hoffman681c6f72006-09-24 21:15:35 +0200434
Guenter Roeckc669ec82014-04-04 18:01:34 +0200435 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
436 data, data->groups);
Guenter Roeck68146a52013-06-06 10:30:10 -0700437
Guenter Roeckc669ec82014-04-04 18:01:34 +0200438 return PTR_ERR_OR_ZERO(hwmon_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439}
440
441static void adm1021_init_client(struct i2c_client *client)
442{
443 /* Enable ADC and disable suspend mode */
Krzysztof Heltc83c41e2007-07-19 08:00:17 +0200444 i2c_smbus_write_byte_data(client, ADM1021_REG_CONFIG_W,
445 i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R) & 0xBF);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 /* Set Conversion rate to 1/sec (this can be tinkered with) */
Krzysztof Heltc83c41e2007-07-19 08:00:17 +0200447 i2c_smbus_write_byte_data(client, ADM1021_REG_CONV_RATE_W, 0x04);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448}
449
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450static struct adm1021_data *adm1021_update_device(struct device *dev)
451{
Guenter Roeckc669ec82014-04-04 18:01:34 +0200452 struct adm1021_data *data = dev_get_drvdata(dev);
453 struct i2c_client *client = data->client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454
Ingo Molnar9a61bf62006-01-18 23:19:26 +0100455 mutex_lock(&data->update_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456
457 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
458 || !data->valid) {
Krzysztof Helta8d6646e2007-09-09 19:51:14 +0200459 int i;
460
Guenter Roeckc669ec82014-04-04 18:01:34 +0200461 dev_dbg(dev, "Starting adm1021 update\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462
Krzysztof Helta8d6646e2007-09-09 19:51:14 +0200463 for (i = 0; i < 2; i++) {
Michael Abbottf2668892009-09-21 17:04:46 -0700464 data->temp[i] = 1000 *
465 (s8) i2c_smbus_read_byte_data(
466 client, ADM1021_REG_TEMP(i));
467 data->temp_max[i] = 1000 *
468 (s8) i2c_smbus_read_byte_data(
469 client, ADM1021_REG_TOS_R(i));
Guenter Roeck68146a52013-06-06 10:30:10 -0700470 if (data->type != lm84) {
471 data->temp_min[i] = 1000 *
472 (s8) i2c_smbus_read_byte_data(client,
473 ADM1021_REG_THYST_R(i));
474 }
Krzysztof Helta8d6646e2007-09-09 19:51:14 +0200475 }
Krzysztof Heltc83c41e2007-07-19 08:00:17 +0200476 data->alarms = i2c_smbus_read_byte_data(client,
477 ADM1021_REG_STATUS) & 0x7c;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 if (data->type == adm1023) {
Guenter Roeck21d2a8f2012-01-14 12:45:47 -0800479 /*
480 * The ADM1023 provides 3 extra bits of precision for
481 * the remote sensor in extra registers.
482 */
Michael Abbottf2668892009-09-21 17:04:46 -0700483 data->temp[1] += 125 * (i2c_smbus_read_byte_data(
484 client, ADM1023_REG_REM_TEMP_PREC) >> 5);
485 data->temp_max[1] += 125 * (i2c_smbus_read_byte_data(
486 client, ADM1023_REG_REM_TOS_PREC) >> 5);
487 data->temp_min[1] += 125 * (i2c_smbus_read_byte_data(
488 client, ADM1023_REG_REM_THYST_PREC) >> 5);
Krzysztof Heltc83c41e2007-07-19 08:00:17 +0200489 data->remote_temp_offset =
490 i2c_smbus_read_byte_data(client,
491 ADM1023_REG_REM_OFFSET);
492 data->remote_temp_offset_prec =
493 i2c_smbus_read_byte_data(client,
494 ADM1023_REG_REM_OFFSET_PREC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 }
496 data->last_updated = jiffies;
497 data->valid = 1;
498 }
499
Ingo Molnar9a61bf62006-01-18 23:19:26 +0100500 mutex_unlock(&data->update_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501
502 return data;
503}
504
Axel Linf0967ee2012-01-20 15:38:18 +0800505module_i2c_driver(adm1021_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506
Guenter Roeck21d2a8f2012-01-14 12:45:47 -0800507MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 "Philip Edelbrock <phil@netroedge.com>");
509MODULE_DESCRIPTION("adm1021 driver");
510MODULE_LICENSE("GPL");
511
512module_param(read_only, bool, 0);
513MODULE_PARM_DESC(read_only, "Don't set any values, read only mode");