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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> |
29 | #include <linux/hwmon.h> |
30 | #include <linux/hwmon-sysfs.h> |
31 | #include <linux/err.h> |
32 | #include <linux/mutex.h> |
33 | #include <linux/sysfs.h> |
34 | #include "lm75.h" |
35 | |
36 | /* Addresses to scan */ |
37 | static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c, |
38 | 0x4d, 0x4e, 0x4f, I2C_CLIENT_END }; |
39 | |
40 | /* Insmod parameters */ |
41 | static int polarity = -1; |
42 | module_param(polarity, int, 0); |
43 | MODULE_PARM_DESC(polarity, "Output's polarity: 0 = active high, 1 = active low"); |
44 | |
45 | /* Many DS1621 constants specified below */ |
46 | /* Config register used for detection */ |
47 | /* 7 6 5 4 3 2 1 0 */ |
48 | /* |Done|THF |TLF |NVB | X | X |POL |1SHOT| */ |
49 | #define DS1621_REG_CONFIG_NVB 0x10 |
50 | #define DS1621_REG_CONFIG_POLARITY 0x02 |
51 | #define DS1621_REG_CONFIG_1SHOT 0x01 |
52 | #define DS1621_REG_CONFIG_DONE 0x80 |
53 | |
54 | /* The DS1621 registers */ |
55 | static const u8 DS1621_REG_TEMP[3] = { |
56 | 0xAA, /* input, word, RO */ |
57 | 0xA2, /* min, word, RW */ |
58 | 0xA1, /* max, word, RW */ |
59 | }; |
60 | #define DS1621_REG_CONF 0xAC /* byte, RW */ |
61 | #define DS1621_COM_START 0xEE /* no data */ |
62 | #define DS1621_COM_STOP 0x22 /* no data */ |
63 | |
64 | /* The DS1621 configuration register */ |
65 | #define DS1621_ALARM_TEMP_HIGH 0x40 |
66 | #define DS1621_ALARM_TEMP_LOW 0x20 |
67 | |
68 | /* Conversions */ |
69 | #define ALARMS_FROM_REG(val) ((val) & \ |
70 | (DS1621_ALARM_TEMP_HIGH | DS1621_ALARM_TEMP_LOW)) |
71 | |
72 | /* Each client has this additional data */ |
73 | struct ds1621_data { |
74 | struct device *hwmon_dev; |
75 | struct mutex update_lock; |
76 | char valid; /* !=0 if following fields are valid */ |
77 | unsigned long last_updated; /* In jiffies */ |
78 | |
79 | u16 temp[3]; /* Register values, word */ |
80 | u8 conf; /* Register encoding, combined */ |
81 | }; |
82 | |
83 | /* Temperature registers are word-sized. |
84 | DS1621 uses a high-byte first convention, which is exactly opposite to |
85 | the SMBus standard. */ |
86 | static int ds1621_read_temp(struct i2c_client *client, u8 reg) |
87 | { |
88 | int ret; |
89 | |
90 | ret = i2c_smbus_read_word_data(client, reg); |
91 | if (ret < 0) |
92 | return ret; |
93 | return swab16(ret); |
94 | } |
95 | |
96 | static int ds1621_write_temp(struct i2c_client *client, u8 reg, u16 value) |
97 | { |
98 | return i2c_smbus_write_word_data(client, reg, swab16(value)); |
99 | } |
100 | |
101 | static void ds1621_init_client(struct i2c_client *client) |
102 | { |
103 | u8 conf, new_conf; |
104 | |
105 | new_conf = conf = i2c_smbus_read_byte_data(client, DS1621_REG_CONF); |
106 | /* switch to continuous conversion mode */ |
107 | new_conf &= ~DS1621_REG_CONFIG_1SHOT; |
108 | |
109 | /* setup output polarity */ |
110 | if (polarity == 0) |
111 | new_conf &= ~DS1621_REG_CONFIG_POLARITY; |
112 | else if (polarity == 1) |
113 | new_conf |= DS1621_REG_CONFIG_POLARITY; |
114 | |
115 | if (conf != new_conf) |
116 | i2c_smbus_write_byte_data(client, DS1621_REG_CONF, new_conf); |
117 | |
118 | /* start conversion */ |
119 | i2c_smbus_write_byte(client, DS1621_COM_START); |
120 | } |
121 | |
122 | static struct ds1621_data *ds1621_update_client(struct device *dev) |
123 | { |
124 | struct i2c_client *client = to_i2c_client(dev); |
125 | struct ds1621_data *data = i2c_get_clientdata(client); |
126 | u8 new_conf; |
127 | |
128 | mutex_lock(&data->update_lock); |
129 | |
130 | if (time_after(jiffies, data->last_updated + HZ + HZ / 2) |
131 | || !data->valid) { |
132 | int i; |
133 | |
134 | dev_dbg(&client->dev, "Starting ds1621 update\n"); |
135 | |
136 | data->conf = i2c_smbus_read_byte_data(client, DS1621_REG_CONF); |
137 | |
138 | for (i = 0; i < ARRAY_SIZE(data->temp); i++) |
139 | data->temp[i] = ds1621_read_temp(client, |
140 | DS1621_REG_TEMP[i]); |
141 | |
142 | /* reset alarms if necessary */ |
143 | new_conf = data->conf; |
144 | if (data->temp[0] > data->temp[1]) /* input > min */ |
145 | new_conf &= ~DS1621_ALARM_TEMP_LOW; |
146 | if (data->temp[0] < data->temp[2]) /* input < max */ |
147 | new_conf &= ~DS1621_ALARM_TEMP_HIGH; |
148 | if (data->conf != new_conf) |
149 | i2c_smbus_write_byte_data(client, DS1621_REG_CONF, |
150 | new_conf); |
151 | |
152 | data->last_updated = jiffies; |
153 | data->valid = 1; |
154 | } |
155 | |
156 | mutex_unlock(&data->update_lock); |
157 | |
158 | return data; |
159 | } |
160 | |
161 | static ssize_t show_temp(struct device *dev, struct device_attribute *da, |
162 | char *buf) |
163 | { |
164 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
165 | struct ds1621_data *data = ds1621_update_client(dev); |
166 | return sprintf(buf, "%d\n", |
167 | LM75_TEMP_FROM_REG(data->temp[attr->index])); |
168 | } |
169 | |
170 | static ssize_t set_temp(struct device *dev, struct device_attribute *da, |
171 | const char *buf, size_t count) |
172 | { |
173 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
174 | struct i2c_client *client = to_i2c_client(dev); |
175 | struct ds1621_data *data = i2c_get_clientdata(client); |
176 | u16 val = LM75_TEMP_TO_REG(simple_strtol(buf, NULL, 10)); |
177 | |
178 | mutex_lock(&data->update_lock); |
179 | data->temp[attr->index] = val; |
180 | ds1621_write_temp(client, DS1621_REG_TEMP[attr->index], |
181 | data->temp[attr->index]); |
182 | mutex_unlock(&data->update_lock); |
183 | return count; |
184 | } |
185 | |
186 | static ssize_t show_alarms(struct device *dev, struct device_attribute *da, |
187 | char *buf) |
188 | { |
189 | struct ds1621_data *data = ds1621_update_client(dev); |
190 | return sprintf(buf, "%d\n", ALARMS_FROM_REG(data->conf)); |
191 | } |
192 | |
193 | static ssize_t show_alarm(struct device *dev, struct device_attribute *da, |
194 | char *buf) |
195 | { |
196 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
197 | struct ds1621_data *data = ds1621_update_client(dev); |
198 | return sprintf(buf, "%d\n", !!(data->conf & attr->index)); |
199 | } |
200 | |
201 | static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); |
202 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); |
203 | static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp, set_temp, 1); |
204 | static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp, set_temp, 2); |
205 | static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, |
206 | DS1621_ALARM_TEMP_LOW); |
207 | static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, |
208 | DS1621_ALARM_TEMP_HIGH); |
209 | |
210 | static struct attribute *ds1621_attributes[] = { |
211 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
212 | &sensor_dev_attr_temp1_min.dev_attr.attr, |
213 | &sensor_dev_attr_temp1_max.dev_attr.attr, |
214 | &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, |
215 | &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, |
216 | &dev_attr_alarms.attr, |
217 | NULL |
218 | }; |
219 | |
220 | static const struct attribute_group ds1621_group = { |
221 | .attrs = ds1621_attributes, |
222 | }; |
223 | |
224 | |
225 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
226 | static int ds1621_detect(struct i2c_client *client, |
227 | struct i2c_board_info *info) |
228 | { |
229 | struct i2c_adapter *adapter = client->adapter; |
230 | int conf, temp; |
231 | int i; |
232 | |
233 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
234 | | I2C_FUNC_SMBUS_WORD_DATA |
235 | | I2C_FUNC_SMBUS_WRITE_BYTE)) |
236 | return -ENODEV; |
237 | |
238 | /* Now, we do the remaining detection. It is lousy. */ |
239 | /* The NVB bit should be low if no EEPROM write has been requested |
240 | during the latest 10ms, which is highly improbable in our case. */ |
241 | conf = i2c_smbus_read_byte_data(client, DS1621_REG_CONF); |
242 | if (conf < 0 || conf & DS1621_REG_CONFIG_NVB) |
243 | return -ENODEV; |
244 | /* The 7 lowest bits of a temperature should always be 0. */ |
245 | for (i = 0; i < ARRAY_SIZE(DS1621_REG_TEMP); i++) { |
246 | temp = i2c_smbus_read_word_data(client, DS1621_REG_TEMP[i]); |
247 | if (temp < 0 || (temp & 0x7f00)) |
248 | return -ENODEV; |
249 | } |
250 | |
251 | strlcpy(info->type, "ds1621", I2C_NAME_SIZE); |
252 | |
253 | return 0; |
254 | } |
255 | |
256 | static int ds1621_probe(struct i2c_client *client, |
257 | const struct i2c_device_id *id) |
258 | { |
259 | struct ds1621_data *data; |
260 | int err; |
261 | |
262 | data = kzalloc(sizeof(struct ds1621_data), GFP_KERNEL); |
263 | if (!data) { |
264 | err = -ENOMEM; |
265 | goto exit; |
266 | } |
267 | |
268 | i2c_set_clientdata(client, data); |
269 | mutex_init(&data->update_lock); |
270 | |
271 | /* Initialize the DS1621 chip */ |
272 | ds1621_init_client(client); |
273 | |
274 | /* Register sysfs hooks */ |
275 | if ((err = sysfs_create_group(&client->dev.kobj, &ds1621_group))) |
276 | goto exit_free; |
277 | |
278 | data->hwmon_dev = hwmon_device_register(&client->dev); |
279 | if (IS_ERR(data->hwmon_dev)) { |
280 | err = PTR_ERR(data->hwmon_dev); |
281 | goto exit_remove_files; |
282 | } |
283 | |
284 | return 0; |
285 | |
286 | exit_remove_files: |
287 | sysfs_remove_group(&client->dev.kobj, &ds1621_group); |
288 | exit_free: |
289 | kfree(data); |
290 | exit: |
291 | return err; |
292 | } |
293 | |
294 | static int ds1621_remove(struct i2c_client *client) |
295 | { |
296 | struct ds1621_data *data = i2c_get_clientdata(client); |
297 | |
298 | hwmon_device_unregister(data->hwmon_dev); |
299 | sysfs_remove_group(&client->dev.kobj, &ds1621_group); |
300 | |
301 | kfree(data); |
302 | |
303 | return 0; |
304 | } |
305 | |
306 | static const struct i2c_device_id ds1621_id[] = { |
307 | { "ds1621", 0 }, |
308 | { "ds1625", 0 }, |
309 | { } |
310 | }; |
311 | MODULE_DEVICE_TABLE(i2c, ds1621_id); |
312 | |
313 | /* This is the driver that will be inserted */ |
314 | static struct i2c_driver ds1621_driver = { |
315 | .class = I2C_CLASS_HWMON, |
316 | .driver = { |
317 | .name = "ds1621", |
318 | }, |
319 | .probe = ds1621_probe, |
320 | .remove = ds1621_remove, |
321 | .id_table = ds1621_id, |
322 | .detect = ds1621_detect, |
323 | .address_list = normal_i2c, |
324 | }; |
325 | |
326 | static int __init ds1621_init(void) |
327 | { |
328 | return i2c_add_driver(&ds1621_driver); |
329 | } |
330 | |
331 | static void __exit ds1621_exit(void) |
332 | { |
333 | i2c_del_driver(&ds1621_driver); |
334 | } |
335 | |
336 | |
337 | MODULE_AUTHOR("Christian W. Zuckschwerdt <zany@triq.net>"); |
338 | MODULE_DESCRIPTION("DS1621 driver"); |
339 | MODULE_LICENSE("GPL"); |
340 | |
341 | module_init(ds1621_init); |
342 | module_exit(ds1621_exit); |
343 |
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