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1da177e4 LT |
1 | /* |
2 | ds1621.c - Part of lm_sensors, Linux kernel modules for hardware | |
3 | monitoring | |
4 | Christian W. Zuckschwerdt <zany@triq.net> 2000-11-23 | |
5 | based on lm75.c by Frodo Looijaard <frodol@dds.nl> | |
6 | Ported to Linux 2.6 by Aurelien Jarno <aurelien@aurel32.net> with | |
7 | the help of Jean Delvare <khali@linux-fr.org> | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation; either version 2 of the License, or | |
12 | (at your option) any later version. | |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with this program; if not, write to the Free Software | |
21 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
22 | */ | |
23 | ||
24 | #include <linux/module.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/jiffies.h> | |
28 | #include <linux/i2c.h> | |
943b0830 | 29 | #include <linux/hwmon.h> |
46a2e71c | 30 | #include <linux/hwmon-sysfs.h> |
943b0830 | 31 | #include <linux/err.h> |
9a61bf63 | 32 | #include <linux/mutex.h> |
a5ebe668 | 33 | #include <linux/sysfs.h> |
1da177e4 LT |
34 | #include "lm75.h" |
35 | ||
36 | /* Addresses to scan */ | |
25e9c86d | 37 | static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c, |
1da177e4 | 38 | 0x4d, 0x4e, 0x4f, I2C_CLIENT_END }; |
1da177e4 LT |
39 | |
40 | /* Insmod parameters */ | |
f4b50261 | 41 | I2C_CLIENT_INSMOD_1(ds1621); |
1da177e4 LT |
42 | static int polarity = -1; |
43 | module_param(polarity, int, 0); | |
44 | MODULE_PARM_DESC(polarity, "Output's polarity: 0 = active high, 1 = active low"); | |
45 | ||
46 | /* Many DS1621 constants specified below */ | |
47 | /* Config register used for detection */ | |
48 | /* 7 6 5 4 3 2 1 0 */ | |
49 | /* |Done|THF |TLF |NVB | X | X |POL |1SHOT| */ | |
50 | #define DS1621_REG_CONFIG_NVB 0x10 | |
51 | #define DS1621_REG_CONFIG_POLARITY 0x02 | |
52 | #define DS1621_REG_CONFIG_1SHOT 0x01 | |
53 | #define DS1621_REG_CONFIG_DONE 0x80 | |
54 | ||
55 | /* The DS1621 registers */ | |
46a2e71c JD |
56 | static const u8 DS1621_REG_TEMP[3] = { |
57 | 0xAA, /* input, word, RO */ | |
58 | 0xA2, /* min, word, RW */ | |
59 | 0xA1, /* max, word, RW */ | |
60 | }; | |
1da177e4 LT |
61 | #define DS1621_REG_CONF 0xAC /* byte, RW */ |
62 | #define DS1621_COM_START 0xEE /* no data */ | |
63 | #define DS1621_COM_STOP 0x22 /* no data */ | |
64 | ||
65 | /* The DS1621 configuration register */ | |
66 | #define DS1621_ALARM_TEMP_HIGH 0x40 | |
67 | #define DS1621_ALARM_TEMP_LOW 0x20 | |
68 | ||
75819f01 | 69 | /* Conversions */ |
1da177e4 LT |
70 | #define ALARMS_FROM_REG(val) ((val) & \ |
71 | (DS1621_ALARM_TEMP_HIGH | DS1621_ALARM_TEMP_LOW)) | |
72 | ||
73 | /* Each client has this additional data */ | |
74 | struct ds1621_data { | |
1beeffe4 | 75 | struct device *hwmon_dev; |
9a61bf63 | 76 | struct mutex update_lock; |
1da177e4 LT |
77 | char valid; /* !=0 if following fields are valid */ |
78 | unsigned long last_updated; /* In jiffies */ | |
79 | ||
46a2e71c | 80 | u16 temp[3]; /* Register values, word */ |
1da177e4 LT |
81 | u8 conf; /* Register encoding, combined */ |
82 | }; | |
83 | ||
1da177e4 LT |
84 | /* All registers are word-sized, except for the configuration register. |
85 | DS1621 uses a high-byte first convention, which is exactly opposite to | |
75819f01 | 86 | the SMBus standard. */ |
1da177e4 LT |
87 | static int ds1621_read_value(struct i2c_client *client, u8 reg) |
88 | { | |
89 | if (reg == DS1621_REG_CONF) | |
90 | return i2c_smbus_read_byte_data(client, reg); | |
91 | else | |
92 | return swab16(i2c_smbus_read_word_data(client, reg)); | |
93 | } | |
94 | ||
1da177e4 LT |
95 | static int ds1621_write_value(struct i2c_client *client, u8 reg, u16 value) |
96 | { | |
97 | if (reg == DS1621_REG_CONF) | |
98 | return i2c_smbus_write_byte_data(client, reg, value); | |
99 | else | |
100 | return i2c_smbus_write_word_data(client, reg, swab16(value)); | |
101 | } | |
102 | ||
103 | static void ds1621_init_client(struct i2c_client *client) | |
104 | { | |
105 | int reg = ds1621_read_value(client, DS1621_REG_CONF); | |
44bbe87e | 106 | /* switch to continuous conversion mode */ |
1da177e4 LT |
107 | reg &= ~ DS1621_REG_CONFIG_1SHOT; |
108 | ||
109 | /* setup output polarity */ | |
110 | if (polarity == 0) | |
111 | reg &= ~DS1621_REG_CONFIG_POLARITY; | |
112 | else if (polarity == 1) | |
113 | reg |= DS1621_REG_CONFIG_POLARITY; | |
114 | ||
115 | ds1621_write_value(client, DS1621_REG_CONF, reg); | |
116 | ||
117 | /* start conversion */ | |
118 | i2c_smbus_write_byte(client, DS1621_COM_START); | |
119 | } | |
120 | ||
9202add6 JD |
121 | static struct ds1621_data *ds1621_update_client(struct device *dev) |
122 | { | |
123 | struct i2c_client *client = to_i2c_client(dev); | |
124 | struct ds1621_data *data = i2c_get_clientdata(client); | |
125 | u8 new_conf; | |
126 | ||
127 | mutex_lock(&data->update_lock); | |
128 | ||
129 | if (time_after(jiffies, data->last_updated + HZ + HZ / 2) | |
130 | || !data->valid) { | |
131 | int i; | |
132 | ||
133 | dev_dbg(&client->dev, "Starting ds1621 update\n"); | |
134 | ||
135 | data->conf = ds1621_read_value(client, DS1621_REG_CONF); | |
136 | ||
137 | for (i = 0; i < ARRAY_SIZE(data->temp); i++) | |
138 | data->temp[i] = ds1621_read_value(client, | |
139 | DS1621_REG_TEMP[i]); | |
140 | ||
141 | /* reset alarms if necessary */ | |
142 | new_conf = data->conf; | |
143 | if (data->temp[0] > data->temp[1]) /* input > min */ | |
144 | new_conf &= ~DS1621_ALARM_TEMP_LOW; | |
145 | if (data->temp[0] < data->temp[2]) /* input < max */ | |
146 | new_conf &= ~DS1621_ALARM_TEMP_HIGH; | |
147 | if (data->conf != new_conf) | |
148 | ds1621_write_value(client, DS1621_REG_CONF, | |
149 | new_conf); | |
150 | ||
151 | data->last_updated = jiffies; | |
152 | data->valid = 1; | |
153 | } | |
154 | ||
155 | mutex_unlock(&data->update_lock); | |
156 | ||
157 | return data; | |
158 | } | |
159 | ||
46a2e71c JD |
160 | static ssize_t show_temp(struct device *dev, struct device_attribute *da, |
161 | char *buf) | |
162 | { | |
163 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
164 | struct ds1621_data *data = ds1621_update_client(dev); | |
165 | return sprintf(buf, "%d\n", | |
166 | LM75_TEMP_FROM_REG(data->temp[attr->index])); | |
1da177e4 LT |
167 | } |
168 | ||
46a2e71c JD |
169 | static ssize_t set_temp(struct device *dev, struct device_attribute *da, |
170 | const char *buf, size_t count) | |
171 | { | |
172 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
173 | struct i2c_client *client = to_i2c_client(dev); | |
174 | struct ds1621_data *data = ds1621_update_client(dev); | |
5bfedac0 | 175 | u16 val = LM75_TEMP_TO_REG(simple_strtol(buf, NULL, 10)); |
1da177e4 | 176 | |
46a2e71c JD |
177 | mutex_lock(&data->update_lock); |
178 | data->temp[attr->index] = val; | |
179 | ds1621_write_value(client, DS1621_REG_TEMP[attr->index], | |
180 | data->temp[attr->index]); | |
181 | mutex_unlock(&data->update_lock); | |
182 | return count; | |
183 | } | |
1da177e4 | 184 | |
46a2e71c JD |
185 | static ssize_t show_alarms(struct device *dev, struct device_attribute *da, |
186 | char *buf) | |
1da177e4 LT |
187 | { |
188 | struct ds1621_data *data = ds1621_update_client(dev); | |
189 | return sprintf(buf, "%d\n", ALARMS_FROM_REG(data->conf)); | |
190 | } | |
191 | ||
87f0f31b JD |
192 | static ssize_t show_alarm(struct device *dev, struct device_attribute *da, |
193 | char *buf) | |
194 | { | |
195 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
196 | struct ds1621_data *data = ds1621_update_client(dev); | |
197 | return sprintf(buf, "%d\n", !!(data->conf & attr->index)); | |
198 | } | |
199 | ||
1da177e4 | 200 | static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); |
46a2e71c JD |
201 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); |
202 | static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp, set_temp, 1); | |
203 | static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp, set_temp, 2); | |
87f0f31b JD |
204 | static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, |
205 | DS1621_ALARM_TEMP_LOW); | |
206 | static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, | |
207 | DS1621_ALARM_TEMP_HIGH); | |
1da177e4 | 208 | |
a5ebe668 | 209 | static struct attribute *ds1621_attributes[] = { |
46a2e71c JD |
210 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
211 | &sensor_dev_attr_temp1_min.dev_attr.attr, | |
212 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
87f0f31b JD |
213 | &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, |
214 | &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, | |
a5ebe668 JD |
215 | &dev_attr_alarms.attr, |
216 | NULL | |
217 | }; | |
218 | ||
219 | static const struct attribute_group ds1621_group = { | |
220 | .attrs = ds1621_attributes, | |
221 | }; | |
222 | ||
1da177e4 | 223 | |
70313eab JD |
224 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
225 | static int ds1621_detect(struct i2c_client *client, int kind, | |
226 | struct i2c_board_info *info) | |
1da177e4 | 227 | { |
70313eab | 228 | struct i2c_adapter *adapter = client->adapter; |
1da177e4 | 229 | int conf, temp; |
70313eab | 230 | int i; |
1da177e4 LT |
231 | |
232 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | |
233 | | I2C_FUNC_SMBUS_WORD_DATA | |
234 | | I2C_FUNC_SMBUS_WRITE_BYTE)) | |
70313eab | 235 | return -ENODEV; |
1da177e4 LT |
236 | |
237 | /* Now, we do the remaining detection. It is lousy. */ | |
238 | if (kind < 0) { | |
239 | /* The NVB bit should be low if no EEPROM write has been | |
240 | requested during the latest 10ms, which is highly | |
241 | improbable in our case. */ | |
75819f01 | 242 | conf = ds1621_read_value(client, DS1621_REG_CONF); |
1da177e4 | 243 | if (conf & DS1621_REG_CONFIG_NVB) |
70313eab | 244 | return -ENODEV; |
1da177e4 | 245 | /* The 7 lowest bits of a temperature should always be 0. */ |
70313eab | 246 | for (i = 0; i < ARRAY_SIZE(DS1621_REG_TEMP); i++) { |
46a2e71c JD |
247 | temp = ds1621_read_value(client, DS1621_REG_TEMP[i]); |
248 | if (temp & 0x007f) | |
70313eab | 249 | return -ENODEV; |
46a2e71c | 250 | } |
1da177e4 LT |
251 | } |
252 | ||
70313eab | 253 | strlcpy(info->type, "ds1621", I2C_NAME_SIZE); |
1da177e4 | 254 | |
70313eab JD |
255 | return 0; |
256 | } | |
257 | ||
258 | static int ds1621_probe(struct i2c_client *client, | |
259 | const struct i2c_device_id *id) | |
260 | { | |
261 | struct ds1621_data *data; | |
262 | int err; | |
263 | ||
264 | data = kzalloc(sizeof(struct ds1621_data), GFP_KERNEL); | |
265 | if (!data) { | |
266 | err = -ENOMEM; | |
267 | goto exit; | |
268 | } | |
269 | ||
270 | i2c_set_clientdata(client, data); | |
271 | mutex_init(&data->update_lock); | |
1da177e4 LT |
272 | |
273 | /* Initialize the DS1621 chip */ | |
75819f01 | 274 | ds1621_init_client(client); |
1da177e4 LT |
275 | |
276 | /* Register sysfs hooks */ | |
75819f01 | 277 | if ((err = sysfs_create_group(&client->dev.kobj, &ds1621_group))) |
70313eab | 278 | goto exit_free; |
a5ebe668 | 279 | |
1beeffe4 TJ |
280 | data->hwmon_dev = hwmon_device_register(&client->dev); |
281 | if (IS_ERR(data->hwmon_dev)) { | |
282 | err = PTR_ERR(data->hwmon_dev); | |
a5ebe668 | 283 | goto exit_remove_files; |
943b0830 MH |
284 | } |
285 | ||
1da177e4 LT |
286 | return 0; |
287 | ||
a5ebe668 | 288 | exit_remove_files: |
75819f01 | 289 | sysfs_remove_group(&client->dev.kobj, &ds1621_group); |
1da177e4 LT |
290 | exit_free: |
291 | kfree(data); | |
292 | exit: | |
293 | return err; | |
294 | } | |
295 | ||
70313eab | 296 | static int ds1621_remove(struct i2c_client *client) |
1da177e4 | 297 | { |
943b0830 | 298 | struct ds1621_data *data = i2c_get_clientdata(client); |
1da177e4 | 299 | |
1beeffe4 | 300 | hwmon_device_unregister(data->hwmon_dev); |
a5ebe668 | 301 | sysfs_remove_group(&client->dev.kobj, &ds1621_group); |
943b0830 | 302 | |
943b0830 | 303 | kfree(data); |
1da177e4 LT |
304 | |
305 | return 0; | |
306 | } | |
307 | ||
9202add6 JD |
308 | static const struct i2c_device_id ds1621_id[] = { |
309 | { "ds1621", ds1621 }, | |
310 | { "ds1625", ds1621 }, | |
311 | { } | |
312 | }; | |
313 | MODULE_DEVICE_TABLE(i2c, ds1621_id); | |
1da177e4 | 314 | |
9202add6 JD |
315 | /* This is the driver that will be inserted */ |
316 | static struct i2c_driver ds1621_driver = { | |
317 | .class = I2C_CLASS_HWMON, | |
318 | .driver = { | |
319 | .name = "ds1621", | |
320 | }, | |
321 | .probe = ds1621_probe, | |
322 | .remove = ds1621_remove, | |
323 | .id_table = ds1621_id, | |
324 | .detect = ds1621_detect, | |
325 | .address_data = &addr_data, | |
326 | }; | |
1da177e4 LT |
327 | |
328 | static int __init ds1621_init(void) | |
329 | { | |
330 | return i2c_add_driver(&ds1621_driver); | |
331 | } | |
332 | ||
333 | static void __exit ds1621_exit(void) | |
334 | { | |
335 | i2c_del_driver(&ds1621_driver); | |
336 | } | |
337 | ||
338 | ||
339 | MODULE_AUTHOR("Christian W. Zuckschwerdt <zany@triq.net>"); | |
340 | MODULE_DESCRIPTION("DS1621 driver"); | |
341 | MODULE_LICENSE("GPL"); | |
342 | ||
343 | module_init(ds1621_init); | |
344 | module_exit(ds1621_exit); |