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/err.h>
37 static unsigned short normal_i2c[] = { 0x18, 0x19, 0x1a,
46 I2C_CLIENT_INSMOD_1(max1619);
49 * The MAX1619 registers
52 #define MAX1619_REG_R_MAN_ID 0xFE
53 #define MAX1619_REG_R_CHIP_ID 0xFF
54 #define MAX1619_REG_R_CONFIG 0x03
55 #define MAX1619_REG_W_CONFIG 0x09
56 #define MAX1619_REG_R_CONVRATE 0x04
57 #define MAX1619_REG_W_CONVRATE 0x0A
58 #define MAX1619_REG_R_STATUS 0x02
59 #define MAX1619_REG_R_LOCAL_TEMP 0x00
60 #define MAX1619_REG_R_REMOTE_TEMP 0x01
61 #define MAX1619_REG_R_REMOTE_HIGH 0x07
62 #define MAX1619_REG_W_REMOTE_HIGH 0x0D
63 #define MAX1619_REG_R_REMOTE_LOW 0x08
64 #define MAX1619_REG_W_REMOTE_LOW 0x0E
65 #define MAX1619_REG_R_REMOTE_CRIT 0x10
66 #define MAX1619_REG_W_REMOTE_CRIT 0x12
67 #define MAX1619_REG_R_TCRIT_HYST 0x11
68 #define MAX1619_REG_W_TCRIT_HYST 0x13
71 * Conversions and various macros
74 #define TEMP_FROM_REG(val) ((val & 0x80 ? val-0x100 : val) * 1000)
75 #define TEMP_TO_REG(val) ((val < 0 ? val+0x100*1000 : val) / 1000)
78 * Functions declaration
81 static int max1619_attach_adapter(struct i2c_adapter *adapter);
82 static int max1619_detect(struct i2c_adapter *adapter, int address,
84 static void max1619_init_client(struct i2c_client *client);
85 static int max1619_detach_client(struct i2c_client *client);
86 static struct max1619_data *max1619_update_device(struct device *dev);
89 * Driver data (common to all clients)
92 static struct i2c_driver max1619_driver = {
95 .flags = I2C_DF_NOTIFY,
96 .attach_adapter = max1619_attach_adapter,
97 .detach_client = max1619_detach_client,
101 * Client data (each client gets its own)
104 struct max1619_data {
105 struct i2c_client client;
106 struct class_device *class_dev;
107 struct semaphore update_lock;
108 char valid; /* zero until following fields are valid */
109 unsigned long last_updated; /* in jiffies */
111 /* registers values */
112 u8 temp_input1; /* local */
113 u8 temp_input2, temp_low2, temp_high2; /* remote */
123 #define show_temp(value) \
124 static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf) \
126 struct max1619_data *data = max1619_update_device(dev); \
127 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->value)); \
129 show_temp(temp_input1);
130 show_temp(temp_input2);
131 show_temp(temp_low2);
132 show_temp(temp_high2);
133 show_temp(temp_crit2);
134 show_temp(temp_hyst2);
136 #define set_temp2(value, reg) \
137 static ssize_t set_##value(struct device *dev, struct device_attribute *attr, const char *buf, \
140 struct i2c_client *client = to_i2c_client(dev); \
141 struct max1619_data *data = i2c_get_clientdata(client); \
142 long val = simple_strtol(buf, NULL, 10); \
144 down(&data->update_lock); \
145 data->value = TEMP_TO_REG(val); \
146 i2c_smbus_write_byte_data(client, reg, data->value); \
147 up(&data->update_lock); \
151 set_temp2(temp_low2, MAX1619_REG_W_REMOTE_LOW);
152 set_temp2(temp_high2, MAX1619_REG_W_REMOTE_HIGH);
153 set_temp2(temp_crit2, MAX1619_REG_W_REMOTE_CRIT);
154 set_temp2(temp_hyst2, MAX1619_REG_W_TCRIT_HYST);
156 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
158 struct max1619_data *data = max1619_update_device(dev);
159 return sprintf(buf, "%d\n", data->alarms);
162 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
163 static DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input2, NULL);
164 static DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp_low2,
166 static DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_high2,
168 static DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp_crit2,
170 static DEVICE_ATTR(temp2_crit_hyst, S_IWUSR | S_IRUGO, show_temp_hyst2,
172 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
178 static int max1619_attach_adapter(struct i2c_adapter *adapter)
180 if (!(adapter->class & I2C_CLASS_HWMON))
182 return i2c_probe(adapter, &addr_data, max1619_detect);
186 * The following function does more than just detection. If detection
187 * succeeds, it also registers the new chip.
189 static int max1619_detect(struct i2c_adapter *adapter, int address, int kind)
191 struct i2c_client *new_client;
192 struct max1619_data *data;
194 const char *name = "";
195 u8 reg_config=0, reg_convrate=0, reg_status=0;
197 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
200 if (!(data = kzalloc(sizeof(struct max1619_data), GFP_KERNEL))) {
205 /* The common I2C client data is placed right before the
206 MAX1619-specific data. */
207 new_client = &data->client;
208 i2c_set_clientdata(new_client, data);
209 new_client->addr = address;
210 new_client->adapter = adapter;
211 new_client->driver = &max1619_driver;
212 new_client->flags = 0;
215 * Now we do the remaining detection. A negative kind means that
216 * the driver was loaded with no force parameter (default), so we
217 * must both detect and identify the chip. A zero kind means that
218 * the driver was loaded with the force parameter, the detection
219 * step shall be skipped. A positive kind means that the driver
220 * was loaded with the force parameter and a given kind of chip is
221 * requested, so both the detection and the identification steps
224 if (kind < 0) { /* detection */
225 reg_config = i2c_smbus_read_byte_data(new_client,
226 MAX1619_REG_R_CONFIG);
227 reg_convrate = i2c_smbus_read_byte_data(new_client,
228 MAX1619_REG_R_CONVRATE);
229 reg_status = i2c_smbus_read_byte_data(new_client,
230 MAX1619_REG_R_STATUS);
231 if ((reg_config & 0x03) != 0x00
232 || reg_convrate > 0x07 || (reg_status & 0x61 ) !=0x00) {
233 dev_dbg(&adapter->dev,
234 "MAX1619 detection failed at 0x%02x.\n",
240 if (kind <= 0) { /* identification */
242 man_id = i2c_smbus_read_byte_data(new_client,
243 MAX1619_REG_R_MAN_ID);
244 chip_id = i2c_smbus_read_byte_data(new_client,
245 MAX1619_REG_R_CHIP_ID);
247 if ((man_id == 0x4D) && (chip_id == 0x04)){
252 if (kind <= 0) { /* identification failed */
253 dev_info(&adapter->dev,
254 "Unsupported chip (man_id=0x%02X, "
255 "chip_id=0x%02X).\n", man_id, chip_id);
260 if (kind == max1619){
264 /* We can fill in the remaining client fields */
265 strlcpy(new_client->name, name, I2C_NAME_SIZE);
267 init_MUTEX(&data->update_lock);
269 /* Tell the I2C layer a new client has arrived */
270 if ((err = i2c_attach_client(new_client)))
273 /* Initialize the MAX1619 chip */
274 max1619_init_client(new_client);
276 /* Register sysfs hooks */
277 data->class_dev = hwmon_device_register(&new_client->dev);
278 if (IS_ERR(data->class_dev)) {
279 err = PTR_ERR(data->class_dev);
283 device_create_file(&new_client->dev, &dev_attr_temp1_input);
284 device_create_file(&new_client->dev, &dev_attr_temp2_input);
285 device_create_file(&new_client->dev, &dev_attr_temp2_min);
286 device_create_file(&new_client->dev, &dev_attr_temp2_max);
287 device_create_file(&new_client->dev, &dev_attr_temp2_crit);
288 device_create_file(&new_client->dev, &dev_attr_temp2_crit_hyst);
289 device_create_file(&new_client->dev, &dev_attr_alarms);
294 i2c_detach_client(new_client);
301 static void max1619_init_client(struct i2c_client *client)
306 * Start the conversions.
308 i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONVRATE,
310 config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG);
312 i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONFIG,
313 config & 0xBF); /* run */
316 static int max1619_detach_client(struct i2c_client *client)
318 struct max1619_data *data = i2c_get_clientdata(client);
321 hwmon_device_unregister(data->class_dev);
323 if ((err = i2c_detach_client(client)))
330 static struct max1619_data *max1619_update_device(struct device *dev)
332 struct i2c_client *client = to_i2c_client(dev);
333 struct max1619_data *data = i2c_get_clientdata(client);
335 down(&data->update_lock);
337 if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
338 dev_dbg(&client->dev, "Updating max1619 data.\n");
339 data->temp_input1 = i2c_smbus_read_byte_data(client,
340 MAX1619_REG_R_LOCAL_TEMP);
341 data->temp_input2 = i2c_smbus_read_byte_data(client,
342 MAX1619_REG_R_REMOTE_TEMP);
343 data->temp_high2 = i2c_smbus_read_byte_data(client,
344 MAX1619_REG_R_REMOTE_HIGH);
345 data->temp_low2 = i2c_smbus_read_byte_data(client,
346 MAX1619_REG_R_REMOTE_LOW);
347 data->temp_crit2 = i2c_smbus_read_byte_data(client,
348 MAX1619_REG_R_REMOTE_CRIT);
349 data->temp_hyst2 = i2c_smbus_read_byte_data(client,
350 MAX1619_REG_R_TCRIT_HYST);
351 data->alarms = i2c_smbus_read_byte_data(client,
352 MAX1619_REG_R_STATUS);
354 data->last_updated = jiffies;
358 up(&data->update_lock);
363 static int __init sensors_max1619_init(void)
365 return i2c_add_driver(&max1619_driver);
368 static void __exit sensors_max1619_exit(void)
370 i2c_del_driver(&max1619_driver);
373 MODULE_AUTHOR("Alexey Fisher <fishor@mail.ru> and "
374 "Jean Delvare <khali@linux-fr.org>");
375 MODULE_DESCRIPTION("MAX1619 sensor driver");
376 MODULE_LICENSE("GPL");
378 module_init(sensors_max1619_init);
379 module_exit(sensors_max1619_exit);