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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 LT |
42 | |
43 | /* | |
44 | * Insmod parameters | |
45 | */ | |
46 | ||
f4b50261 | 47 | I2C_CLIENT_INSMOD_1(max1619); |
1da177e4 LT |
48 | |
49 | /* | |
50 | * The MAX1619 registers | |
51 | */ | |
52 | ||
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 | |
70 | ||
71 | /* | |
a80e8ee6 | 72 | * Conversions |
1da177e4 LT |
73 | */ |
74 | ||
a80e8ee6 AM |
75 | static int temp_from_reg(int val) |
76 | { | |
77 | return (val & 0x80 ? val-0x100 : val) * 1000; | |
78 | } | |
79 | ||
80 | static int temp_to_reg(int val) | |
81 | { | |
82 | return (val < 0 ? val+0x100*1000 : val) / 1000; | |
83 | } | |
1da177e4 LT |
84 | |
85 | /* | |
86 | * Functions declaration | |
87 | */ | |
88 | ||
c6d3f6fa JD |
89 | static int max1619_probe(struct i2c_client *client, |
90 | const struct i2c_device_id *id); | |
310ec792 | 91 | static int max1619_detect(struct i2c_client *client, |
c6d3f6fa | 92 | struct i2c_board_info *info); |
1da177e4 | 93 | static void max1619_init_client(struct i2c_client *client); |
c6d3f6fa | 94 | static int max1619_remove(struct i2c_client *client); |
1da177e4 LT |
95 | static struct max1619_data *max1619_update_device(struct device *dev); |
96 | ||
97 | /* | |
98 | * Driver data (common to all clients) | |
99 | */ | |
100 | ||
c6d3f6fa JD |
101 | static const struct i2c_device_id max1619_id[] = { |
102 | { "max1619", max1619 }, | |
103 | { } | |
104 | }; | |
105 | MODULE_DEVICE_TABLE(i2c, max1619_id); | |
106 | ||
1da177e4 | 107 | static struct i2c_driver max1619_driver = { |
c6d3f6fa | 108 | .class = I2C_CLASS_HWMON, |
cdaf7934 | 109 | .driver = { |
cdaf7934 LR |
110 | .name = "max1619", |
111 | }, | |
c6d3f6fa JD |
112 | .probe = max1619_probe, |
113 | .remove = max1619_remove, | |
114 | .id_table = max1619_id, | |
115 | .detect = max1619_detect, | |
c3813d6a | 116 | .address_list = normal_i2c, |
1da177e4 LT |
117 | }; |
118 | ||
119 | /* | |
120 | * Client data (each client gets its own) | |
121 | */ | |
122 | ||
123 | struct max1619_data { | |
1beeffe4 | 124 | struct device *hwmon_dev; |
9a61bf63 | 125 | struct mutex update_lock; |
1da177e4 LT |
126 | char valid; /* zero until following fields are valid */ |
127 | unsigned long last_updated; /* in jiffies */ | |
128 | ||
129 | /* registers values */ | |
130 | u8 temp_input1; /* local */ | |
131 | u8 temp_input2, temp_low2, temp_high2; /* remote */ | |
132 | u8 temp_crit2; | |
133 | u8 temp_hyst2; | |
134 | u8 alarms; | |
135 | }; | |
136 | ||
137 | /* | |
138 | * Sysfs stuff | |
139 | */ | |
140 | ||
141 | #define show_temp(value) \ | |
8627f9ba | 142 | static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
143 | { \ |
144 | struct max1619_data *data = max1619_update_device(dev); \ | |
a80e8ee6 | 145 | return sprintf(buf, "%d\n", temp_from_reg(data->value)); \ |
1da177e4 LT |
146 | } |
147 | show_temp(temp_input1); | |
148 | show_temp(temp_input2); | |
149 | show_temp(temp_low2); | |
150 | show_temp(temp_high2); | |
151 | show_temp(temp_crit2); | |
152 | show_temp(temp_hyst2); | |
153 | ||
154 | #define set_temp2(value, reg) \ | |
8627f9ba | 155 | static ssize_t set_##value(struct device *dev, struct device_attribute *attr, const char *buf, \ |
1da177e4 LT |
156 | size_t count) \ |
157 | { \ | |
158 | struct i2c_client *client = to_i2c_client(dev); \ | |
159 | struct max1619_data *data = i2c_get_clientdata(client); \ | |
160 | long val = simple_strtol(buf, NULL, 10); \ | |
161 | \ | |
9a61bf63 | 162 | mutex_lock(&data->update_lock); \ |
a80e8ee6 | 163 | data->value = temp_to_reg(val); \ |
1da177e4 | 164 | i2c_smbus_write_byte_data(client, reg, data->value); \ |
9a61bf63 | 165 | mutex_unlock(&data->update_lock); \ |
1da177e4 LT |
166 | return count; \ |
167 | } | |
168 | ||
169 | set_temp2(temp_low2, MAX1619_REG_W_REMOTE_LOW); | |
170 | set_temp2(temp_high2, MAX1619_REG_W_REMOTE_HIGH); | |
171 | set_temp2(temp_crit2, MAX1619_REG_W_REMOTE_CRIT); | |
172 | set_temp2(temp_hyst2, MAX1619_REG_W_TCRIT_HYST); | |
173 | ||
8627f9ba | 174 | static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
175 | { |
176 | struct max1619_data *data = max1619_update_device(dev); | |
177 | return sprintf(buf, "%d\n", data->alarms); | |
178 | } | |
179 | ||
71062ffc JD |
180 | static ssize_t show_alarm(struct device *dev, struct device_attribute *attr, |
181 | char *buf) | |
182 | { | |
183 | int bitnr = to_sensor_dev_attr(attr)->index; | |
184 | struct max1619_data *data = max1619_update_device(dev); | |
185 | return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1); | |
186 | } | |
187 | ||
1da177e4 LT |
188 | static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL); |
189 | static DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input2, NULL); | |
190 | static DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp_low2, | |
191 | set_temp_low2); | |
192 | static DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_high2, | |
193 | set_temp_high2); | |
194 | static DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp_crit2, | |
195 | set_temp_crit2); | |
196 | static DEVICE_ATTR(temp2_crit_hyst, S_IWUSR | S_IRUGO, show_temp_hyst2, | |
197 | set_temp_hyst2); | |
198 | static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); | |
71062ffc JD |
199 | static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1); |
200 | static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2); | |
201 | static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3); | |
202 | static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4); | |
1da177e4 | 203 | |
a5ebe668 JD |
204 | static struct attribute *max1619_attributes[] = { |
205 | &dev_attr_temp1_input.attr, | |
206 | &dev_attr_temp2_input.attr, | |
207 | &dev_attr_temp2_min.attr, | |
208 | &dev_attr_temp2_max.attr, | |
209 | &dev_attr_temp2_crit.attr, | |
210 | &dev_attr_temp2_crit_hyst.attr, | |
211 | ||
212 | &dev_attr_alarms.attr, | |
71062ffc JD |
213 | &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr, |
214 | &sensor_dev_attr_temp2_fault.dev_attr.attr, | |
215 | &sensor_dev_attr_temp2_min_alarm.dev_attr.attr, | |
216 | &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, | |
a5ebe668 JD |
217 | NULL |
218 | }; | |
219 | ||
220 | static const struct attribute_group max1619_group = { | |
221 | .attrs = max1619_attributes, | |
222 | }; | |
223 | ||
1da177e4 LT |
224 | /* |
225 | * Real code | |
226 | */ | |
227 | ||
c6d3f6fa | 228 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
310ec792 | 229 | static int max1619_detect(struct i2c_client *client, |
c6d3f6fa | 230 | struct i2c_board_info *info) |
1da177e4 | 231 | { |
52df6440 JD |
232 | struct i2c_adapter *adapter = client->adapter; |
233 | u8 reg_config, reg_convrate, reg_status, man_id, chip_id; | |
b0020e3f | 234 | |
1da177e4 | 235 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) |
c6d3f6fa | 236 | return -ENODEV; |
1da177e4 | 237 | |
52df6440 JD |
238 | /* detection */ |
239 | reg_config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG); | |
240 | reg_convrate = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONVRATE); | |
241 | reg_status = i2c_smbus_read_byte_data(client, MAX1619_REG_R_STATUS); | |
242 | if ((reg_config & 0x03) != 0x00 | |
243 | || reg_convrate > 0x07 || (reg_status & 0x61) != 0x00) { | |
244 | dev_dbg(&adapter->dev, "MAX1619 detection failed at 0x%02x\n", | |
245 | client->addr); | |
246 | return -ENODEV; | |
1da177e4 LT |
247 | } |
248 | ||
52df6440 JD |
249 | /* identification */ |
250 | man_id = i2c_smbus_read_byte_data(client, MAX1619_REG_R_MAN_ID); | |
251 | chip_id = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CHIP_ID); | |
252 | if (man_id != 0x4D || chip_id != 0x04) { | |
253 | dev_info(&adapter->dev, | |
254 | "Unsupported chip (man_id=0x%02X, chip_id=0x%02X).\n", | |
255 | man_id, chip_id); | |
256 | return -ENODEV; | |
b0020e3f | 257 | } |
1da177e4 | 258 | |
c6d3f6fa JD |
259 | strlcpy(info->type, "max1619", I2C_NAME_SIZE); |
260 | ||
261 | return 0; | |
262 | } | |
263 | ||
264 | static int max1619_probe(struct i2c_client *new_client, | |
265 | const struct i2c_device_id *id) | |
266 | { | |
267 | struct max1619_data *data; | |
268 | int err; | |
269 | ||
270 | data = kzalloc(sizeof(struct max1619_data), GFP_KERNEL); | |
271 | if (!data) { | |
272 | err = -ENOMEM; | |
273 | goto exit; | |
274 | } | |
1da177e4 | 275 | |
c6d3f6fa | 276 | i2c_set_clientdata(new_client, data); |
1da177e4 | 277 | data->valid = 0; |
9a61bf63 | 278 | mutex_init(&data->update_lock); |
1da177e4 | 279 | |
1da177e4 LT |
280 | /* Initialize the MAX1619 chip */ |
281 | max1619_init_client(new_client); | |
282 | ||
283 | /* Register sysfs hooks */ | |
a5ebe668 | 284 | if ((err = sysfs_create_group(&new_client->dev.kobj, &max1619_group))) |
c6d3f6fa | 285 | goto exit_free; |
a5ebe668 | 286 | |
1beeffe4 TJ |
287 | data->hwmon_dev = hwmon_device_register(&new_client->dev); |
288 | if (IS_ERR(data->hwmon_dev)) { | |
289 | err = PTR_ERR(data->hwmon_dev); | |
a5ebe668 | 290 | goto exit_remove_files; |
943b0830 MH |
291 | } |
292 | ||
1da177e4 LT |
293 | return 0; |
294 | ||
a5ebe668 JD |
295 | exit_remove_files: |
296 | sysfs_remove_group(&new_client->dev.kobj, &max1619_group); | |
1da177e4 LT |
297 | exit_free: |
298 | kfree(data); | |
299 | exit: | |
300 | return err; | |
301 | } | |
302 | ||
303 | static void max1619_init_client(struct i2c_client *client) | |
304 | { | |
305 | u8 config; | |
306 | ||
307 | /* | |
308 | * Start the conversions. | |
309 | */ | |
310 | i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONVRATE, | |
311 | 5); /* 2 Hz */ | |
312 | config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG); | |
313 | if (config & 0x40) | |
314 | i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONFIG, | |
315 | config & 0xBF); /* run */ | |
316 | } | |
317 | ||
c6d3f6fa | 318 | static int max1619_remove(struct i2c_client *client) |
1da177e4 | 319 | { |
943b0830 | 320 | struct max1619_data *data = i2c_get_clientdata(client); |
1da177e4 | 321 | |
1beeffe4 | 322 | hwmon_device_unregister(data->hwmon_dev); |
a5ebe668 | 323 | sysfs_remove_group(&client->dev.kobj, &max1619_group); |
943b0830 | 324 | |
943b0830 | 325 | kfree(data); |
1da177e4 LT |
326 | return 0; |
327 | } | |
328 | ||
329 | static struct max1619_data *max1619_update_device(struct device *dev) | |
330 | { | |
331 | struct i2c_client *client = to_i2c_client(dev); | |
332 | struct max1619_data *data = i2c_get_clientdata(client); | |
333 | ||
9a61bf63 | 334 | mutex_lock(&data->update_lock); |
1da177e4 LT |
335 | |
336 | if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) { | |
337 | dev_dbg(&client->dev, "Updating max1619 data.\n"); | |
338 | data->temp_input1 = i2c_smbus_read_byte_data(client, | |
339 | MAX1619_REG_R_LOCAL_TEMP); | |
340 | data->temp_input2 = i2c_smbus_read_byte_data(client, | |
341 | MAX1619_REG_R_REMOTE_TEMP); | |
342 | data->temp_high2 = i2c_smbus_read_byte_data(client, | |
343 | MAX1619_REG_R_REMOTE_HIGH); | |
344 | data->temp_low2 = i2c_smbus_read_byte_data(client, | |
345 | MAX1619_REG_R_REMOTE_LOW); | |
346 | data->temp_crit2 = i2c_smbus_read_byte_data(client, | |
347 | MAX1619_REG_R_REMOTE_CRIT); | |
348 | data->temp_hyst2 = i2c_smbus_read_byte_data(client, | |
349 | MAX1619_REG_R_TCRIT_HYST); | |
350 | data->alarms = i2c_smbus_read_byte_data(client, | |
351 | MAX1619_REG_R_STATUS); | |
352 | ||
353 | data->last_updated = jiffies; | |
354 | data->valid = 1; | |
355 | } | |
356 | ||
9a61bf63 | 357 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
358 | |
359 | return data; | |
360 | } | |
361 | ||
362 | static int __init sensors_max1619_init(void) | |
363 | { | |
364 | return i2c_add_driver(&max1619_driver); | |
365 | } | |
366 | ||
367 | static void __exit sensors_max1619_exit(void) | |
368 | { | |
369 | i2c_del_driver(&max1619_driver); | |
370 | } | |
371 | ||
368609c5 | 372 | MODULE_AUTHOR("Alexey Fisher <fishor@mail.ru> and " |
1da177e4 LT |
373 | "Jean Delvare <khali@linux-fr.org>"); |
374 | MODULE_DESCRIPTION("MAX1619 sensor driver"); | |
375 | MODULE_LICENSE("GPL"); | |
376 | ||
377 | module_init(sensors_max1619_init); | |
378 | module_exit(sensors_max1619_exit); |