2 * max1619.c - Part of lm_sensors, Linux kernel modules for hardware
4 * Copyright (C) 2003-2004 Alexey Fisher <fishor@mail.ru>
5 * Jean Delvare <khali@linux-fr.org>
7 * Based on the lm90 driver. The MAX1619 is a sensor chip made by Maxim.
8 * It reports up to two temperatures (its own plus up to
9 * one external one). Complete datasheet can be
10 * obtained from Maxim's website at:
11 * http://pdfserv.maxim-ic.com/en/ds/MAX1619.pdf
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29 #include <linux/module.h>
30 #include <linux/init.h>
31 #include <linux/slab.h>
32 #include <linux/jiffies.h>
33 #include <linux/i2c.h>
34 #include <linux/hwmon.h>
35 #include <linux/hwmon-sysfs.h>
36 #include <linux/err.h>
37 #include <linux/mutex.h>
38 #include <linux/sysfs.h>
40 static const unsigned short normal_i2c[] = {
41 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
47 I2C_CLIENT_INSMOD_1(max1619);
50 * The MAX1619 registers
53 #define MAX1619_REG_R_MAN_ID 0xFE
54 #define MAX1619_REG_R_CHIP_ID 0xFF
55 #define MAX1619_REG_R_CONFIG 0x03
56 #define MAX1619_REG_W_CONFIG 0x09
57 #define MAX1619_REG_R_CONVRATE 0x04
58 #define MAX1619_REG_W_CONVRATE 0x0A
59 #define MAX1619_REG_R_STATUS 0x02
60 #define MAX1619_REG_R_LOCAL_TEMP 0x00
61 #define MAX1619_REG_R_REMOTE_TEMP 0x01
62 #define MAX1619_REG_R_REMOTE_HIGH 0x07
63 #define MAX1619_REG_W_REMOTE_HIGH 0x0D
64 #define MAX1619_REG_R_REMOTE_LOW 0x08
65 #define MAX1619_REG_W_REMOTE_LOW 0x0E
66 #define MAX1619_REG_R_REMOTE_CRIT 0x10
67 #define MAX1619_REG_W_REMOTE_CRIT 0x12
68 #define MAX1619_REG_R_TCRIT_HYST 0x11
69 #define MAX1619_REG_W_TCRIT_HYST 0x13
72 * Conversions and various macros
75 #define TEMP_FROM_REG(val) ((val & 0x80 ? val-0x100 : val) * 1000)
76 #define TEMP_TO_REG(val) ((val < 0 ? val+0x100*1000 : val) / 1000)
79 * Functions declaration
82 static int max1619_probe(struct i2c_client *client,
83 const struct i2c_device_id *id);
84 static int max1619_detect(struct i2c_client *client, int kind,
85 struct i2c_board_info *info);
86 static void max1619_init_client(struct i2c_client *client);
87 static int max1619_remove(struct i2c_client *client);
88 static struct max1619_data *max1619_update_device(struct device *dev);
91 * Driver data (common to all clients)
94 static const struct i2c_device_id max1619_id[] = {
95 { "max1619", max1619 },
98 MODULE_DEVICE_TABLE(i2c, max1619_id);
100 static struct i2c_driver max1619_driver = {
101 .class = I2C_CLASS_HWMON,
105 .probe = max1619_probe,
106 .remove = max1619_remove,
107 .id_table = max1619_id,
108 .detect = max1619_detect,
109 .address_data = &addr_data,
113 * Client data (each client gets its own)
116 struct max1619_data {
117 struct device *hwmon_dev;
118 struct mutex update_lock;
119 char valid; /* zero until following fields are valid */
120 unsigned long last_updated; /* in jiffies */
122 /* registers values */
123 u8 temp_input1; /* local */
124 u8 temp_input2, temp_low2, temp_high2; /* remote */
134 #define show_temp(value) \
135 static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf) \
137 struct max1619_data *data = max1619_update_device(dev); \
138 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->value)); \
140 show_temp(temp_input1);
141 show_temp(temp_input2);
142 show_temp(temp_low2);
143 show_temp(temp_high2);
144 show_temp(temp_crit2);
145 show_temp(temp_hyst2);
147 #define set_temp2(value, reg) \
148 static ssize_t set_##value(struct device *dev, struct device_attribute *attr, const char *buf, \
151 struct i2c_client *client = to_i2c_client(dev); \
152 struct max1619_data *data = i2c_get_clientdata(client); \
153 long val = simple_strtol(buf, NULL, 10); \
155 mutex_lock(&data->update_lock); \
156 data->value = TEMP_TO_REG(val); \
157 i2c_smbus_write_byte_data(client, reg, data->value); \
158 mutex_unlock(&data->update_lock); \
162 set_temp2(temp_low2, MAX1619_REG_W_REMOTE_LOW);
163 set_temp2(temp_high2, MAX1619_REG_W_REMOTE_HIGH);
164 set_temp2(temp_crit2, MAX1619_REG_W_REMOTE_CRIT);
165 set_temp2(temp_hyst2, MAX1619_REG_W_TCRIT_HYST);
167 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
169 struct max1619_data *data = max1619_update_device(dev);
170 return sprintf(buf, "%d\n", data->alarms);
173 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
176 int bitnr = to_sensor_dev_attr(attr)->index;
177 struct max1619_data *data = max1619_update_device(dev);
178 return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
181 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
182 static DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input2, NULL);
183 static DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp_low2,
185 static DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_high2,
187 static DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp_crit2,
189 static DEVICE_ATTR(temp2_crit_hyst, S_IWUSR | S_IRUGO, show_temp_hyst2,
191 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
192 static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1);
193 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
194 static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3);
195 static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
197 static struct attribute *max1619_attributes[] = {
198 &dev_attr_temp1_input.attr,
199 &dev_attr_temp2_input.attr,
200 &dev_attr_temp2_min.attr,
201 &dev_attr_temp2_max.attr,
202 &dev_attr_temp2_crit.attr,
203 &dev_attr_temp2_crit_hyst.attr,
205 &dev_attr_alarms.attr,
206 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
207 &sensor_dev_attr_temp2_fault.dev_attr.attr,
208 &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
209 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
213 static const struct attribute_group max1619_group = {
214 .attrs = max1619_attributes,
221 /* Return 0 if detection is successful, -ENODEV otherwise */
222 static int max1619_detect(struct i2c_client *new_client, int kind,
223 struct i2c_board_info *info)
225 struct i2c_adapter *adapter = new_client->adapter;
226 u8 reg_config=0, reg_convrate=0, reg_status=0;
228 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
232 * Now we do the remaining detection. A negative kind means that
233 * the driver was loaded with no force parameter (default), so we
234 * must both detect and identify the chip. A zero kind means that
235 * the driver was loaded with the force parameter, the detection
236 * step shall be skipped. A positive kind means that the driver
237 * was loaded with the force parameter and a given kind of chip is
238 * requested, so both the detection and the identification steps
241 if (kind < 0) { /* detection */
242 reg_config = i2c_smbus_read_byte_data(new_client,
243 MAX1619_REG_R_CONFIG);
244 reg_convrate = i2c_smbus_read_byte_data(new_client,
245 MAX1619_REG_R_CONVRATE);
246 reg_status = i2c_smbus_read_byte_data(new_client,
247 MAX1619_REG_R_STATUS);
248 if ((reg_config & 0x03) != 0x00
249 || reg_convrate > 0x07 || (reg_status & 0x61 ) !=0x00) {
250 dev_dbg(&adapter->dev,
251 "MAX1619 detection failed at 0x%02x.\n",
257 if (kind <= 0) { /* identification */
260 man_id = i2c_smbus_read_byte_data(new_client,
261 MAX1619_REG_R_MAN_ID);
262 chip_id = i2c_smbus_read_byte_data(new_client,
263 MAX1619_REG_R_CHIP_ID);
265 if ((man_id == 0x4D) && (chip_id == 0x04))
268 if (kind <= 0) { /* identification failed */
269 dev_info(&adapter->dev,
270 "Unsupported chip (man_id=0x%02X, "
271 "chip_id=0x%02X).\n", man_id, chip_id);
276 strlcpy(info->type, "max1619", I2C_NAME_SIZE);
281 static int max1619_probe(struct i2c_client *new_client,
282 const struct i2c_device_id *id)
284 struct max1619_data *data;
287 data = kzalloc(sizeof(struct max1619_data), GFP_KERNEL);
293 i2c_set_clientdata(new_client, data);
295 mutex_init(&data->update_lock);
297 /* Initialize the MAX1619 chip */
298 max1619_init_client(new_client);
300 /* Register sysfs hooks */
301 if ((err = sysfs_create_group(&new_client->dev.kobj, &max1619_group)))
304 data->hwmon_dev = hwmon_device_register(&new_client->dev);
305 if (IS_ERR(data->hwmon_dev)) {
306 err = PTR_ERR(data->hwmon_dev);
307 goto exit_remove_files;
313 sysfs_remove_group(&new_client->dev.kobj, &max1619_group);
320 static void max1619_init_client(struct i2c_client *client)
325 * Start the conversions.
327 i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONVRATE,
329 config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG);
331 i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONFIG,
332 config & 0xBF); /* run */
335 static int max1619_remove(struct i2c_client *client)
337 struct max1619_data *data = i2c_get_clientdata(client);
339 hwmon_device_unregister(data->hwmon_dev);
340 sysfs_remove_group(&client->dev.kobj, &max1619_group);
346 static struct max1619_data *max1619_update_device(struct device *dev)
348 struct i2c_client *client = to_i2c_client(dev);
349 struct max1619_data *data = i2c_get_clientdata(client);
351 mutex_lock(&data->update_lock);
353 if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
354 dev_dbg(&client->dev, "Updating max1619 data.\n");
355 data->temp_input1 = i2c_smbus_read_byte_data(client,
356 MAX1619_REG_R_LOCAL_TEMP);
357 data->temp_input2 = i2c_smbus_read_byte_data(client,
358 MAX1619_REG_R_REMOTE_TEMP);
359 data->temp_high2 = i2c_smbus_read_byte_data(client,
360 MAX1619_REG_R_REMOTE_HIGH);
361 data->temp_low2 = i2c_smbus_read_byte_data(client,
362 MAX1619_REG_R_REMOTE_LOW);
363 data->temp_crit2 = i2c_smbus_read_byte_data(client,
364 MAX1619_REG_R_REMOTE_CRIT);
365 data->temp_hyst2 = i2c_smbus_read_byte_data(client,
366 MAX1619_REG_R_TCRIT_HYST);
367 data->alarms = i2c_smbus_read_byte_data(client,
368 MAX1619_REG_R_STATUS);
370 data->last_updated = jiffies;
374 mutex_unlock(&data->update_lock);
379 static int __init sensors_max1619_init(void)
381 return i2c_add_driver(&max1619_driver);
384 static void __exit sensors_max1619_exit(void)
386 i2c_del_driver(&max1619_driver);
389 MODULE_AUTHOR("Alexey Fisher <fishor@mail.ru> and "
390 "Jean Delvare <khali@linux-fr.org>");
391 MODULE_DESCRIPTION("MAX1619 sensor driver");
392 MODULE_LICENSE("GPL");
394 module_init(sensors_max1619_init);
395 module_exit(sensors_max1619_exit);