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1da177e4 LT |
1 | /* |
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 | ||
1da177e4 LT |
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> | |
943b0830 | 34 | #include <linux/hwmon.h> |
71062ffc | 35 | #include <linux/hwmon-sysfs.h> |
943b0830 | 36 | #include <linux/err.h> |
9a61bf63 | 37 | #include <linux/mutex.h> |
a5ebe668 | 38 | #include <linux/sysfs.h> |
1da177e4 | 39 | |
25e9c86d MH |
40 | static const unsigned short normal_i2c[] = { |
41 | 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END }; | |
1da177e4 | 42 | |
1da177e4 LT |
43 | /* |
44 | * The MAX1619 registers | |
45 | */ | |
46 | ||
47 | #define MAX1619_REG_R_MAN_ID 0xFE | |
48 | #define MAX1619_REG_R_CHIP_ID 0xFF | |
49 | #define MAX1619_REG_R_CONFIG 0x03 | |
50 | #define MAX1619_REG_W_CONFIG 0x09 | |
51 | #define MAX1619_REG_R_CONVRATE 0x04 | |
52 | #define MAX1619_REG_W_CONVRATE 0x0A | |
53 | #define MAX1619_REG_R_STATUS 0x02 | |
54 | #define MAX1619_REG_R_LOCAL_TEMP 0x00 | |
55 | #define MAX1619_REG_R_REMOTE_TEMP 0x01 | |
56 | #define MAX1619_REG_R_REMOTE_HIGH 0x07 | |
57 | #define MAX1619_REG_W_REMOTE_HIGH 0x0D | |
58 | #define MAX1619_REG_R_REMOTE_LOW 0x08 | |
59 | #define MAX1619_REG_W_REMOTE_LOW 0x0E | |
60 | #define MAX1619_REG_R_REMOTE_CRIT 0x10 | |
61 | #define MAX1619_REG_W_REMOTE_CRIT 0x12 | |
62 | #define MAX1619_REG_R_TCRIT_HYST 0x11 | |
63 | #define MAX1619_REG_W_TCRIT_HYST 0x13 | |
64 | ||
65 | /* | |
a80e8ee6 | 66 | * Conversions |
1da177e4 LT |
67 | */ |
68 | ||
a80e8ee6 AM |
69 | static int temp_from_reg(int val) |
70 | { | |
71 | return (val & 0x80 ? val-0x100 : val) * 1000; | |
72 | } | |
73 | ||
74 | static int temp_to_reg(int val) | |
75 | { | |
76 | return (val < 0 ? val+0x100*1000 : val) / 1000; | |
77 | } | |
1da177e4 LT |
78 | |
79 | /* | |
80 | * Functions declaration | |
81 | */ | |
82 | ||
c6d3f6fa JD |
83 | static int max1619_probe(struct i2c_client *client, |
84 | const struct i2c_device_id *id); | |
310ec792 | 85 | static int max1619_detect(struct i2c_client *client, |
c6d3f6fa | 86 | struct i2c_board_info *info); |
1da177e4 | 87 | static void max1619_init_client(struct i2c_client *client); |
c6d3f6fa | 88 | static int max1619_remove(struct i2c_client *client); |
1da177e4 LT |
89 | static struct max1619_data *max1619_update_device(struct device *dev); |
90 | ||
91 | /* | |
92 | * Driver data (common to all clients) | |
93 | */ | |
94 | ||
c6d3f6fa | 95 | static const struct i2c_device_id max1619_id[] = { |
1f86df49 | 96 | { "max1619", 0 }, |
c6d3f6fa JD |
97 | { } |
98 | }; | |
99 | MODULE_DEVICE_TABLE(i2c, max1619_id); | |
100 | ||
1da177e4 | 101 | static struct i2c_driver max1619_driver = { |
c6d3f6fa | 102 | .class = I2C_CLASS_HWMON, |
cdaf7934 | 103 | .driver = { |
cdaf7934 LR |
104 | .name = "max1619", |
105 | }, | |
c6d3f6fa JD |
106 | .probe = max1619_probe, |
107 | .remove = max1619_remove, | |
108 | .id_table = max1619_id, | |
109 | .detect = max1619_detect, | |
c3813d6a | 110 | .address_list = normal_i2c, |
1da177e4 LT |
111 | }; |
112 | ||
113 | /* | |
114 | * Client data (each client gets its own) | |
115 | */ | |
116 | ||
117 | struct max1619_data { | |
1beeffe4 | 118 | struct device *hwmon_dev; |
9a61bf63 | 119 | struct mutex update_lock; |
1da177e4 LT |
120 | char valid; /* zero until following fields are valid */ |
121 | unsigned long last_updated; /* in jiffies */ | |
122 | ||
123 | /* registers values */ | |
124 | u8 temp_input1; /* local */ | |
125 | u8 temp_input2, temp_low2, temp_high2; /* remote */ | |
126 | u8 temp_crit2; | |
127 | u8 temp_hyst2; | |
128 | u8 alarms; | |
129 | }; | |
130 | ||
131 | /* | |
132 | * Sysfs stuff | |
133 | */ | |
134 | ||
135 | #define show_temp(value) \ | |
8627f9ba | 136 | static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
137 | { \ |
138 | struct max1619_data *data = max1619_update_device(dev); \ | |
a80e8ee6 | 139 | return sprintf(buf, "%d\n", temp_from_reg(data->value)); \ |
1da177e4 LT |
140 | } |
141 | show_temp(temp_input1); | |
142 | show_temp(temp_input2); | |
143 | show_temp(temp_low2); | |
144 | show_temp(temp_high2); | |
145 | show_temp(temp_crit2); | |
146 | show_temp(temp_hyst2); | |
147 | ||
148 | #define set_temp2(value, reg) \ | |
8627f9ba | 149 | static ssize_t set_##value(struct device *dev, struct device_attribute *attr, const char *buf, \ |
1da177e4 LT |
150 | size_t count) \ |
151 | { \ | |
152 | struct i2c_client *client = to_i2c_client(dev); \ | |
153 | struct max1619_data *data = i2c_get_clientdata(client); \ | |
154 | long val = simple_strtol(buf, NULL, 10); \ | |
155 | \ | |
9a61bf63 | 156 | mutex_lock(&data->update_lock); \ |
a80e8ee6 | 157 | data->value = temp_to_reg(val); \ |
1da177e4 | 158 | i2c_smbus_write_byte_data(client, reg, data->value); \ |
9a61bf63 | 159 | mutex_unlock(&data->update_lock); \ |
1da177e4 LT |
160 | return count; \ |
161 | } | |
162 | ||
163 | set_temp2(temp_low2, MAX1619_REG_W_REMOTE_LOW); | |
164 | set_temp2(temp_high2, MAX1619_REG_W_REMOTE_HIGH); | |
165 | set_temp2(temp_crit2, MAX1619_REG_W_REMOTE_CRIT); | |
166 | set_temp2(temp_hyst2, MAX1619_REG_W_TCRIT_HYST); | |
167 | ||
8627f9ba | 168 | static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
169 | { |
170 | struct max1619_data *data = max1619_update_device(dev); | |
171 | return sprintf(buf, "%d\n", data->alarms); | |
172 | } | |
173 | ||
71062ffc JD |
174 | static ssize_t show_alarm(struct device *dev, struct device_attribute *attr, |
175 | char *buf) | |
176 | { | |
177 | int bitnr = to_sensor_dev_attr(attr)->index; | |
178 | struct max1619_data *data = max1619_update_device(dev); | |
179 | return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1); | |
180 | } | |
181 | ||
1da177e4 LT |
182 | static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL); |
183 | static DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input2, NULL); | |
184 | static DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp_low2, | |
185 | set_temp_low2); | |
186 | static DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_high2, | |
187 | set_temp_high2); | |
188 | static DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp_crit2, | |
189 | set_temp_crit2); | |
190 | static DEVICE_ATTR(temp2_crit_hyst, S_IWUSR | S_IRUGO, show_temp_hyst2, | |
191 | set_temp_hyst2); | |
192 | static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); | |
71062ffc JD |
193 | static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1); |
194 | static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2); | |
195 | static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3); | |
196 | static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4); | |
1da177e4 | 197 | |
a5ebe668 JD |
198 | static struct attribute *max1619_attributes[] = { |
199 | &dev_attr_temp1_input.attr, | |
200 | &dev_attr_temp2_input.attr, | |
201 | &dev_attr_temp2_min.attr, | |
202 | &dev_attr_temp2_max.attr, | |
203 | &dev_attr_temp2_crit.attr, | |
204 | &dev_attr_temp2_crit_hyst.attr, | |
205 | ||
206 | &dev_attr_alarms.attr, | |
71062ffc JD |
207 | &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr, |
208 | &sensor_dev_attr_temp2_fault.dev_attr.attr, | |
209 | &sensor_dev_attr_temp2_min_alarm.dev_attr.attr, | |
210 | &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, | |
a5ebe668 JD |
211 | NULL |
212 | }; | |
213 | ||
214 | static const struct attribute_group max1619_group = { | |
215 | .attrs = max1619_attributes, | |
216 | }; | |
217 | ||
1da177e4 LT |
218 | /* |
219 | * Real code | |
220 | */ | |
221 | ||
c6d3f6fa | 222 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
310ec792 | 223 | static int max1619_detect(struct i2c_client *client, |
c6d3f6fa | 224 | struct i2c_board_info *info) |
1da177e4 | 225 | { |
52df6440 JD |
226 | struct i2c_adapter *adapter = client->adapter; |
227 | u8 reg_config, reg_convrate, reg_status, man_id, chip_id; | |
b0020e3f | 228 | |
1da177e4 | 229 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) |
c6d3f6fa | 230 | return -ENODEV; |
1da177e4 | 231 | |
52df6440 JD |
232 | /* detection */ |
233 | reg_config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG); | |
234 | reg_convrate = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONVRATE); | |
235 | reg_status = i2c_smbus_read_byte_data(client, MAX1619_REG_R_STATUS); | |
236 | if ((reg_config & 0x03) != 0x00 | |
237 | || reg_convrate > 0x07 || (reg_status & 0x61) != 0x00) { | |
238 | dev_dbg(&adapter->dev, "MAX1619 detection failed at 0x%02x\n", | |
239 | client->addr); | |
240 | return -ENODEV; | |
1da177e4 LT |
241 | } |
242 | ||
52df6440 JD |
243 | /* identification */ |
244 | man_id = i2c_smbus_read_byte_data(client, MAX1619_REG_R_MAN_ID); | |
245 | chip_id = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CHIP_ID); | |
246 | if (man_id != 0x4D || chip_id != 0x04) { | |
247 | dev_info(&adapter->dev, | |
248 | "Unsupported chip (man_id=0x%02X, chip_id=0x%02X).\n", | |
249 | man_id, chip_id); | |
250 | return -ENODEV; | |
b0020e3f | 251 | } |
1da177e4 | 252 | |
c6d3f6fa JD |
253 | strlcpy(info->type, "max1619", I2C_NAME_SIZE); |
254 | ||
255 | return 0; | |
256 | } | |
257 | ||
258 | static int max1619_probe(struct i2c_client *new_client, | |
259 | const struct i2c_device_id *id) | |
260 | { | |
261 | struct max1619_data *data; | |
262 | int err; | |
263 | ||
264 | data = kzalloc(sizeof(struct max1619_data), GFP_KERNEL); | |
265 | if (!data) { | |
266 | err = -ENOMEM; | |
267 | goto exit; | |
268 | } | |
1da177e4 | 269 | |
c6d3f6fa | 270 | i2c_set_clientdata(new_client, data); |
1da177e4 | 271 | data->valid = 0; |
9a61bf63 | 272 | mutex_init(&data->update_lock); |
1da177e4 | 273 | |
1da177e4 LT |
274 | /* Initialize the MAX1619 chip */ |
275 | max1619_init_client(new_client); | |
276 | ||
277 | /* Register sysfs hooks */ | |
a5ebe668 | 278 | if ((err = sysfs_create_group(&new_client->dev.kobj, &max1619_group))) |
c6d3f6fa | 279 | goto exit_free; |
a5ebe668 | 280 | |
1beeffe4 TJ |
281 | data->hwmon_dev = hwmon_device_register(&new_client->dev); |
282 | if (IS_ERR(data->hwmon_dev)) { | |
283 | err = PTR_ERR(data->hwmon_dev); | |
a5ebe668 | 284 | goto exit_remove_files; |
943b0830 MH |
285 | } |
286 | ||
1da177e4 LT |
287 | return 0; |
288 | ||
a5ebe668 JD |
289 | exit_remove_files: |
290 | sysfs_remove_group(&new_client->dev.kobj, &max1619_group); | |
1da177e4 LT |
291 | exit_free: |
292 | kfree(data); | |
293 | exit: | |
294 | return err; | |
295 | } | |
296 | ||
297 | static void max1619_init_client(struct i2c_client *client) | |
298 | { | |
299 | u8 config; | |
300 | ||
301 | /* | |
302 | * Start the conversions. | |
303 | */ | |
304 | i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONVRATE, | |
305 | 5); /* 2 Hz */ | |
306 | config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG); | |
307 | if (config & 0x40) | |
308 | i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONFIG, | |
309 | config & 0xBF); /* run */ | |
310 | } | |
311 | ||
c6d3f6fa | 312 | static int max1619_remove(struct i2c_client *client) |
1da177e4 | 313 | { |
943b0830 | 314 | struct max1619_data *data = i2c_get_clientdata(client); |
1da177e4 | 315 | |
1beeffe4 | 316 | hwmon_device_unregister(data->hwmon_dev); |
a5ebe668 | 317 | sysfs_remove_group(&client->dev.kobj, &max1619_group); |
943b0830 | 318 | |
943b0830 | 319 | kfree(data); |
1da177e4 LT |
320 | return 0; |
321 | } | |
322 | ||
323 | static struct max1619_data *max1619_update_device(struct device *dev) | |
324 | { | |
325 | struct i2c_client *client = to_i2c_client(dev); | |
326 | struct max1619_data *data = i2c_get_clientdata(client); | |
327 | ||
9a61bf63 | 328 | mutex_lock(&data->update_lock); |
1da177e4 LT |
329 | |
330 | if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) { | |
331 | dev_dbg(&client->dev, "Updating max1619 data.\n"); | |
332 | data->temp_input1 = i2c_smbus_read_byte_data(client, | |
333 | MAX1619_REG_R_LOCAL_TEMP); | |
334 | data->temp_input2 = i2c_smbus_read_byte_data(client, | |
335 | MAX1619_REG_R_REMOTE_TEMP); | |
336 | data->temp_high2 = i2c_smbus_read_byte_data(client, | |
337 | MAX1619_REG_R_REMOTE_HIGH); | |
338 | data->temp_low2 = i2c_smbus_read_byte_data(client, | |
339 | MAX1619_REG_R_REMOTE_LOW); | |
340 | data->temp_crit2 = i2c_smbus_read_byte_data(client, | |
341 | MAX1619_REG_R_REMOTE_CRIT); | |
342 | data->temp_hyst2 = i2c_smbus_read_byte_data(client, | |
343 | MAX1619_REG_R_TCRIT_HYST); | |
344 | data->alarms = i2c_smbus_read_byte_data(client, | |
345 | MAX1619_REG_R_STATUS); | |
346 | ||
347 | data->last_updated = jiffies; | |
348 | data->valid = 1; | |
349 | } | |
350 | ||
9a61bf63 | 351 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
352 | |
353 | return data; | |
354 | } | |
355 | ||
356 | static int __init sensors_max1619_init(void) | |
357 | { | |
358 | return i2c_add_driver(&max1619_driver); | |
359 | } | |
360 | ||
361 | static void __exit sensors_max1619_exit(void) | |
362 | { | |
363 | i2c_del_driver(&max1619_driver); | |
364 | } | |
365 | ||
368609c5 | 366 | MODULE_AUTHOR("Alexey Fisher <fishor@mail.ru> and " |
1da177e4 LT |
367 | "Jean Delvare <khali@linux-fr.org>"); |
368 | MODULE_DESCRIPTION("MAX1619 sensor driver"); | |
369 | MODULE_LICENSE("GPL"); | |
370 | ||
371 | module_init(sensors_max1619_init); | |
372 | module_exit(sensors_max1619_exit); |