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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * max1619.c - Part of lm_sensors, Linux kernel modules for hardware
3 * monitoring
4 * Copyright (C) 2003-2004 Alexey Fisher <fishor@mail.ru>
5 * Jean Delvare <khali@linux-fr.org>
6 *
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
12 *
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.
17 *
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.
22 *
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.
26 */
27
28
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <linux/module.h>
30#include <linux/init.h>
31#include <linux/slab.h>
32#include <linux/jiffies.h>
33#include <linux/i2c.h>
Mark M. Hoffman943b0832005-07-15 21:39:18 -040034#include <linux/hwmon.h>
35#include <linux/err.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
37static unsigned short normal_i2c[] = { 0x18, 0x19, 0x1a,
38 0x29, 0x2a, 0x2b,
39 0x4c, 0x4d, 0x4e,
40 I2C_CLIENT_END };
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
42/*
43 * Insmod parameters
44 */
45
Jean Delvaref4b50262005-07-31 21:49:03 +020046I2C_CLIENT_INSMOD_1(max1619);
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
48/*
49 * The MAX1619 registers
50 */
51
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
69
70/*
71 * Conversions and various macros
72 */
73
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)
76
77/*
78 * Functions declaration
79 */
80
81static int max1619_attach_adapter(struct i2c_adapter *adapter);
82static int max1619_detect(struct i2c_adapter *adapter, int address,
83 int kind);
84static void max1619_init_client(struct i2c_client *client);
85static int max1619_detach_client(struct i2c_client *client);
86static struct max1619_data *max1619_update_device(struct device *dev);
87
88/*
89 * Driver data (common to all clients)
90 */
91
92static struct i2c_driver max1619_driver = {
93 .owner = THIS_MODULE,
94 .name = "max1619",
95 .flags = I2C_DF_NOTIFY,
96 .attach_adapter = max1619_attach_adapter,
97 .detach_client = max1619_detach_client,
98};
99
100/*
101 * Client data (each client gets its own)
102 */
103
104struct max1619_data {
105 struct i2c_client client;
Mark M. Hoffman943b0832005-07-15 21:39:18 -0400106 struct class_device *class_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 struct semaphore update_lock;
108 char valid; /* zero until following fields are valid */
109 unsigned long last_updated; /* in jiffies */
110
111 /* registers values */
112 u8 temp_input1; /* local */
113 u8 temp_input2, temp_low2, temp_high2; /* remote */
114 u8 temp_crit2;
115 u8 temp_hyst2;
116 u8 alarms;
117};
118
119/*
120 * Sysfs stuff
121 */
122
123#define show_temp(value) \
Yani Ioannou8627f9b2005-05-17 06:42:03 -0400124static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125{ \
126 struct max1619_data *data = max1619_update_device(dev); \
127 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->value)); \
128}
129show_temp(temp_input1);
130show_temp(temp_input2);
131show_temp(temp_low2);
132show_temp(temp_high2);
133show_temp(temp_crit2);
134show_temp(temp_hyst2);
135
136#define set_temp2(value, reg) \
Yani Ioannou8627f9b2005-05-17 06:42:03 -0400137static ssize_t set_##value(struct device *dev, struct device_attribute *attr, const char *buf, \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 size_t count) \
139{ \
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); \
143 \
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); \
148 return count; \
149}
150
151set_temp2(temp_low2, MAX1619_REG_W_REMOTE_LOW);
152set_temp2(temp_high2, MAX1619_REG_W_REMOTE_HIGH);
153set_temp2(temp_crit2, MAX1619_REG_W_REMOTE_CRIT);
154set_temp2(temp_hyst2, MAX1619_REG_W_TCRIT_HYST);
155
Yani Ioannou8627f9b2005-05-17 06:42:03 -0400156static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157{
158 struct max1619_data *data = max1619_update_device(dev);
159 return sprintf(buf, "%d\n", data->alarms);
160}
161
162static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
163static DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input2, NULL);
164static DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp_low2,
165 set_temp_low2);
166static DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_high2,
167 set_temp_high2);
168static DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp_crit2,
169 set_temp_crit2);
170static DEVICE_ATTR(temp2_crit_hyst, S_IWUSR | S_IRUGO, show_temp_hyst2,
171 set_temp_hyst2);
172static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
173
174/*
175 * Real code
176 */
177
178static int max1619_attach_adapter(struct i2c_adapter *adapter)
179{
180 if (!(adapter->class & I2C_CLASS_HWMON))
181 return 0;
Jean Delvare2ed2dc32005-07-31 21:42:02 +0200182 return i2c_probe(adapter, &addr_data, max1619_detect);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183}
184
185/*
186 * The following function does more than just detection. If detection
187 * succeeds, it also registers the new chip.
188 */
189static int max1619_detect(struct i2c_adapter *adapter, int address, int kind)
190{
191 struct i2c_client *new_client;
192 struct max1619_data *data;
193 int err = 0;
194 const char *name = "";
195 u8 reg_config=0, reg_convrate=0, reg_status=0;
196 u8 man_id, chip_id;
197 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
198 goto exit;
199
Deepak Saxenaba9c2e82005-10-17 23:08:32 +0200200 if (!(data = kzalloc(sizeof(struct max1619_data), GFP_KERNEL))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 err = -ENOMEM;
202 goto exit;
203 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204
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;
213
214 /*
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
222 * are skipped.
223 */
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",
235 address);
236 goto exit_free;
237 }
238 }
239
240 if (kind <= 0) { /* identification */
241
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);
246
247 if ((man_id == 0x4D) && (chip_id == 0x04)){
248 kind = max1619;
249 }
250 }
251
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);
256 goto exit_free;
257 }
258
259
260 if (kind == max1619){
261 name = "max1619";
262 }
263
264 /* We can fill in the remaining client fields */
265 strlcpy(new_client->name, name, I2C_NAME_SIZE);
266 data->valid = 0;
267 init_MUTEX(&data->update_lock);
268
269 /* Tell the I2C layer a new client has arrived */
270 if ((err = i2c_attach_client(new_client)))
271 goto exit_free;
272
273 /* Initialize the MAX1619 chip */
274 max1619_init_client(new_client);
275
276 /* Register sysfs hooks */
Mark M. Hoffman943b0832005-07-15 21:39:18 -0400277 data->class_dev = hwmon_device_register(&new_client->dev);
278 if (IS_ERR(data->class_dev)) {
279 err = PTR_ERR(data->class_dev);
280 goto exit_detach;
281 }
282
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 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);
290
291 return 0;
292
Mark M. Hoffman943b0832005-07-15 21:39:18 -0400293exit_detach:
294 i2c_detach_client(new_client);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295exit_free:
296 kfree(data);
297exit:
298 return err;
299}
300
301static void max1619_init_client(struct i2c_client *client)
302{
303 u8 config;
304
305 /*
306 * Start the conversions.
307 */
308 i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONVRATE,
309 5); /* 2 Hz */
310 config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG);
311 if (config & 0x40)
312 i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONFIG,
313 config & 0xBF); /* run */
314}
315
316static int max1619_detach_client(struct i2c_client *client)
317{
Mark M. Hoffman943b0832005-07-15 21:39:18 -0400318 struct max1619_data *data = i2c_get_clientdata(client);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 int err;
320
Mark M. Hoffman943b0832005-07-15 21:39:18 -0400321 hwmon_device_unregister(data->class_dev);
322
Jean Delvare7bef5592005-07-27 22:14:49 +0200323 if ((err = i2c_detach_client(client)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325
Mark M. Hoffman943b0832005-07-15 21:39:18 -0400326 kfree(data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 return 0;
328}
329
330static struct max1619_data *max1619_update_device(struct device *dev)
331{
332 struct i2c_client *client = to_i2c_client(dev);
333 struct max1619_data *data = i2c_get_clientdata(client);
334
335 down(&data->update_lock);
336
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);
353
354 data->last_updated = jiffies;
355 data->valid = 1;
356 }
357
358 up(&data->update_lock);
359
360 return data;
361}
362
363static int __init sensors_max1619_init(void)
364{
365 return i2c_add_driver(&max1619_driver);
366}
367
368static void __exit sensors_max1619_exit(void)
369{
370 i2c_del_driver(&max1619_driver);
371}
372
Jean Delvare368609c2005-07-29 12:15:07 -0700373MODULE_AUTHOR("Alexey Fisher <fishor@mail.ru> and "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 "Jean Delvare <khali@linux-fr.org>");
375MODULE_DESCRIPTION("MAX1619 sensor driver");
376MODULE_LICENSE("GPL");
377
378module_init(sensors_max1619_init);
379module_exit(sensors_max1619_exit);