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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 { | |
75 | struct i2c_client client; | |
1beeffe4 | 76 | struct device *hwmon_dev; |
9a61bf63 | 77 | struct mutex update_lock; |
1da177e4 LT |
78 | char valid; /* !=0 if following fields are valid */ |
79 | unsigned long last_updated; /* In jiffies */ | |
80 | ||
46a2e71c | 81 | u16 temp[3]; /* Register values, word */ |
1da177e4 LT |
82 | u8 conf; /* Register encoding, combined */ |
83 | }; | |
84 | ||
85 | static int ds1621_attach_adapter(struct i2c_adapter *adapter); | |
86 | static int ds1621_detect(struct i2c_adapter *adapter, int address, | |
87 | int kind); | |
88 | static void ds1621_init_client(struct i2c_client *client); | |
89 | static int ds1621_detach_client(struct i2c_client *client); | |
90 | static struct ds1621_data *ds1621_update_client(struct device *dev); | |
91 | ||
92 | /* This is the driver that will be inserted */ | |
93 | static struct i2c_driver ds1621_driver = { | |
cdaf7934 | 94 | .driver = { |
cdaf7934 LR |
95 | .name = "ds1621", |
96 | }, | |
1da177e4 LT |
97 | .attach_adapter = ds1621_attach_adapter, |
98 | .detach_client = ds1621_detach_client, | |
99 | }; | |
100 | ||
101 | /* All registers are word-sized, except for the configuration register. | |
102 | DS1621 uses a high-byte first convention, which is exactly opposite to | |
75819f01 | 103 | the SMBus standard. */ |
1da177e4 LT |
104 | static int ds1621_read_value(struct i2c_client *client, u8 reg) |
105 | { | |
106 | if (reg == DS1621_REG_CONF) | |
107 | return i2c_smbus_read_byte_data(client, reg); | |
108 | else | |
109 | return swab16(i2c_smbus_read_word_data(client, reg)); | |
110 | } | |
111 | ||
1da177e4 LT |
112 | static int ds1621_write_value(struct i2c_client *client, u8 reg, u16 value) |
113 | { | |
114 | if (reg == DS1621_REG_CONF) | |
115 | return i2c_smbus_write_byte_data(client, reg, value); | |
116 | else | |
117 | return i2c_smbus_write_word_data(client, reg, swab16(value)); | |
118 | } | |
119 | ||
120 | static void ds1621_init_client(struct i2c_client *client) | |
121 | { | |
122 | int reg = ds1621_read_value(client, DS1621_REG_CONF); | |
44bbe87e | 123 | /* switch to continuous conversion mode */ |
1da177e4 LT |
124 | reg &= ~ DS1621_REG_CONFIG_1SHOT; |
125 | ||
126 | /* setup output polarity */ | |
127 | if (polarity == 0) | |
128 | reg &= ~DS1621_REG_CONFIG_POLARITY; | |
129 | else if (polarity == 1) | |
130 | reg |= DS1621_REG_CONFIG_POLARITY; | |
131 | ||
132 | ds1621_write_value(client, DS1621_REG_CONF, reg); | |
133 | ||
134 | /* start conversion */ | |
135 | i2c_smbus_write_byte(client, DS1621_COM_START); | |
136 | } | |
137 | ||
46a2e71c JD |
138 | static ssize_t show_temp(struct device *dev, struct device_attribute *da, |
139 | char *buf) | |
140 | { | |
141 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
142 | struct ds1621_data *data = ds1621_update_client(dev); | |
143 | return sprintf(buf, "%d\n", | |
144 | LM75_TEMP_FROM_REG(data->temp[attr->index])); | |
1da177e4 LT |
145 | } |
146 | ||
46a2e71c JD |
147 | static ssize_t set_temp(struct device *dev, struct device_attribute *da, |
148 | const char *buf, size_t count) | |
149 | { | |
150 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
151 | struct i2c_client *client = to_i2c_client(dev); | |
152 | struct ds1621_data *data = ds1621_update_client(dev); | |
5bfedac0 | 153 | u16 val = LM75_TEMP_TO_REG(simple_strtol(buf, NULL, 10)); |
1da177e4 | 154 | |
46a2e71c JD |
155 | mutex_lock(&data->update_lock); |
156 | data->temp[attr->index] = val; | |
157 | ds1621_write_value(client, DS1621_REG_TEMP[attr->index], | |
158 | data->temp[attr->index]); | |
159 | mutex_unlock(&data->update_lock); | |
160 | return count; | |
161 | } | |
1da177e4 | 162 | |
46a2e71c JD |
163 | static ssize_t show_alarms(struct device *dev, struct device_attribute *da, |
164 | char *buf) | |
1da177e4 LT |
165 | { |
166 | struct ds1621_data *data = ds1621_update_client(dev); | |
167 | return sprintf(buf, "%d\n", ALARMS_FROM_REG(data->conf)); | |
168 | } | |
169 | ||
87f0f31b JD |
170 | static ssize_t show_alarm(struct device *dev, struct device_attribute *da, |
171 | char *buf) | |
172 | { | |
173 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
174 | struct ds1621_data *data = ds1621_update_client(dev); | |
175 | return sprintf(buf, "%d\n", !!(data->conf & attr->index)); | |
176 | } | |
177 | ||
1da177e4 | 178 | static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); |
46a2e71c JD |
179 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); |
180 | static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp, set_temp, 1); | |
181 | static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp, set_temp, 2); | |
87f0f31b JD |
182 | static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, |
183 | DS1621_ALARM_TEMP_LOW); | |
184 | static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, | |
185 | DS1621_ALARM_TEMP_HIGH); | |
1da177e4 | 186 | |
a5ebe668 | 187 | static struct attribute *ds1621_attributes[] = { |
46a2e71c JD |
188 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
189 | &sensor_dev_attr_temp1_min.dev_attr.attr, | |
190 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
87f0f31b JD |
191 | &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, |
192 | &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, | |
a5ebe668 JD |
193 | &dev_attr_alarms.attr, |
194 | NULL | |
195 | }; | |
196 | ||
197 | static const struct attribute_group ds1621_group = { | |
198 | .attrs = ds1621_attributes, | |
199 | }; | |
200 | ||
1da177e4 LT |
201 | |
202 | static int ds1621_attach_adapter(struct i2c_adapter *adapter) | |
203 | { | |
ddec748f JD |
204 | if (!(adapter->class & I2C_CLASS_HWMON)) |
205 | return 0; | |
2ed2dc3c | 206 | return i2c_probe(adapter, &addr_data, ds1621_detect); |
1da177e4 LT |
207 | } |
208 | ||
2ed2dc3c | 209 | /* This function is called by i2c_probe */ |
c49efcef BD |
210 | static int ds1621_detect(struct i2c_adapter *adapter, int address, |
211 | int kind) | |
1da177e4 LT |
212 | { |
213 | int conf, temp; | |
75819f01 | 214 | struct i2c_client *client; |
1da177e4 | 215 | struct ds1621_data *data; |
46a2e71c | 216 | int i, err = 0; |
1da177e4 LT |
217 | |
218 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | |
219 | | I2C_FUNC_SMBUS_WORD_DATA | |
220 | | I2C_FUNC_SMBUS_WRITE_BYTE)) | |
221 | goto exit; | |
222 | ||
223 | /* OK. For now, we presume we have a valid client. We now create the | |
224 | client structure, even though we cannot fill it completely yet. | |
225 | But it allows us to access ds1621_{read,write}_value. */ | |
ba9c2e8d | 226 | if (!(data = kzalloc(sizeof(struct ds1621_data), GFP_KERNEL))) { |
1da177e4 LT |
227 | err = -ENOMEM; |
228 | goto exit; | |
229 | } | |
1da177e4 | 230 | |
75819f01 JD |
231 | client = &data->client; |
232 | i2c_set_clientdata(client, data); | |
233 | client->addr = address; | |
234 | client->adapter = adapter; | |
235 | client->driver = &ds1621_driver; | |
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 LT |
243 | if (conf & DS1621_REG_CONFIG_NVB) |
244 | goto exit_free; | |
245 | /* The 7 lowest bits of a temperature should always be 0. */ | |
46a2e71c JD |
246 | for (i = 0; i < ARRAY_SIZE(data->temp); i++) { |
247 | temp = ds1621_read_value(client, DS1621_REG_TEMP[i]); | |
248 | if (temp & 0x007f) | |
249 | goto exit_free; | |
250 | } | |
1da177e4 LT |
251 | } |
252 | ||
1da177e4 | 253 | /* Fill in remaining client fields and put it into the global list */ |
75819f01 | 254 | strlcpy(client->name, "ds1621", I2C_NAME_SIZE); |
9a61bf63 | 255 | mutex_init(&data->update_lock); |
1da177e4 LT |
256 | |
257 | /* Tell the I2C layer a new client has arrived */ | |
75819f01 | 258 | if ((err = i2c_attach_client(client))) |
1da177e4 LT |
259 | goto exit_free; |
260 | ||
261 | /* Initialize the DS1621 chip */ | |
75819f01 | 262 | ds1621_init_client(client); |
1da177e4 LT |
263 | |
264 | /* Register sysfs hooks */ | |
75819f01 | 265 | if ((err = sysfs_create_group(&client->dev.kobj, &ds1621_group))) |
a5ebe668 JD |
266 | goto exit_detach; |
267 | ||
1beeffe4 TJ |
268 | data->hwmon_dev = hwmon_device_register(&client->dev); |
269 | if (IS_ERR(data->hwmon_dev)) { | |
270 | err = PTR_ERR(data->hwmon_dev); | |
a5ebe668 | 271 | goto exit_remove_files; |
943b0830 MH |
272 | } |
273 | ||
1da177e4 LT |
274 | return 0; |
275 | ||
a5ebe668 | 276 | exit_remove_files: |
75819f01 | 277 | sysfs_remove_group(&client->dev.kobj, &ds1621_group); |
943b0830 | 278 | exit_detach: |
75819f01 | 279 | i2c_detach_client(client); |
1da177e4 LT |
280 | exit_free: |
281 | kfree(data); | |
282 | exit: | |
283 | return err; | |
284 | } | |
285 | ||
286 | static int ds1621_detach_client(struct i2c_client *client) | |
287 | { | |
943b0830 | 288 | struct ds1621_data *data = i2c_get_clientdata(client); |
1da177e4 LT |
289 | int err; |
290 | ||
1beeffe4 | 291 | hwmon_device_unregister(data->hwmon_dev); |
a5ebe668 | 292 | sysfs_remove_group(&client->dev.kobj, &ds1621_group); |
943b0830 | 293 | |
7bef5594 | 294 | if ((err = i2c_detach_client(client))) |
1da177e4 | 295 | return err; |
1da177e4 | 296 | |
943b0830 | 297 | kfree(data); |
1da177e4 LT |
298 | |
299 | return 0; | |
300 | } | |
301 | ||
302 | ||
303 | static struct ds1621_data *ds1621_update_client(struct device *dev) | |
304 | { | |
305 | struct i2c_client *client = to_i2c_client(dev); | |
306 | struct ds1621_data *data = i2c_get_clientdata(client); | |
307 | u8 new_conf; | |
308 | ||
9a61bf63 | 309 | mutex_lock(&data->update_lock); |
1da177e4 LT |
310 | |
311 | if (time_after(jiffies, data->last_updated + HZ + HZ / 2) | |
312 | || !data->valid) { | |
46a2e71c | 313 | int i; |
1da177e4 LT |
314 | |
315 | dev_dbg(&client->dev, "Starting ds1621 update\n"); | |
316 | ||
317 | data->conf = ds1621_read_value(client, DS1621_REG_CONF); | |
318 | ||
46a2e71c JD |
319 | for (i = 0; i < ARRAY_SIZE(data->temp); i++) |
320 | data->temp[i] = ds1621_read_value(client, | |
321 | DS1621_REG_TEMP[i]); | |
1da177e4 | 322 | |
44bbe87e | 323 | /* reset alarms if necessary */ |
1da177e4 | 324 | new_conf = data->conf; |
46a2e71c | 325 | if (data->temp[0] > data->temp[1]) /* input > min */ |
1da177e4 | 326 | new_conf &= ~DS1621_ALARM_TEMP_LOW; |
46a2e71c | 327 | if (data->temp[0] < data->temp[2]) /* input < max */ |
1da177e4 LT |
328 | new_conf &= ~DS1621_ALARM_TEMP_HIGH; |
329 | if (data->conf != new_conf) | |
330 | ds1621_write_value(client, DS1621_REG_CONF, | |
331 | new_conf); | |
332 | ||
333 | data->last_updated = jiffies; | |
334 | data->valid = 1; | |
335 | } | |
336 | ||
9a61bf63 | 337 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
338 | |
339 | return data; | |
340 | } | |
341 | ||
342 | static int __init ds1621_init(void) | |
343 | { | |
344 | return i2c_add_driver(&ds1621_driver); | |
345 | } | |
346 | ||
347 | static void __exit ds1621_exit(void) | |
348 | { | |
349 | i2c_del_driver(&ds1621_driver); | |
350 | } | |
351 | ||
352 | ||
353 | MODULE_AUTHOR("Christian W. Zuckschwerdt <zany@triq.net>"); | |
354 | MODULE_DESCRIPTION("DS1621 driver"); | |
355 | MODULE_LICENSE("GPL"); | |
356 | ||
357 | module_init(ds1621_init); | |
358 | module_exit(ds1621_exit); |