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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 MH |
29 | #include <linux/hwmon.h> |
30 | #include <linux/err.h> | |
1da177e4 LT |
31 | #include "lm75.h" |
32 | ||
33 | /* Addresses to scan */ | |
34 | static unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c, | |
35 | 0x4d, 0x4e, 0x4f, I2C_CLIENT_END }; | |
1da177e4 LT |
36 | |
37 | /* Insmod parameters */ | |
f4b50261 | 38 | I2C_CLIENT_INSMOD_1(ds1621); |
1da177e4 LT |
39 | static int polarity = -1; |
40 | module_param(polarity, int, 0); | |
41 | MODULE_PARM_DESC(polarity, "Output's polarity: 0 = active high, 1 = active low"); | |
42 | ||
43 | /* Many DS1621 constants specified below */ | |
44 | /* Config register used for detection */ | |
45 | /* 7 6 5 4 3 2 1 0 */ | |
46 | /* |Done|THF |TLF |NVB | X | X |POL |1SHOT| */ | |
47 | #define DS1621_REG_CONFIG_NVB 0x10 | |
48 | #define DS1621_REG_CONFIG_POLARITY 0x02 | |
49 | #define DS1621_REG_CONFIG_1SHOT 0x01 | |
50 | #define DS1621_REG_CONFIG_DONE 0x80 | |
51 | ||
52 | /* The DS1621 registers */ | |
53 | #define DS1621_REG_TEMP 0xAA /* word, RO */ | |
54 | #define DS1621_REG_TEMP_MIN 0xA1 /* word, RW */ | |
55 | #define DS1621_REG_TEMP_MAX 0xA2 /* word, RW */ | |
56 | #define DS1621_REG_CONF 0xAC /* byte, RW */ | |
57 | #define DS1621_COM_START 0xEE /* no data */ | |
58 | #define DS1621_COM_STOP 0x22 /* no data */ | |
59 | ||
60 | /* The DS1621 configuration register */ | |
61 | #define DS1621_ALARM_TEMP_HIGH 0x40 | |
62 | #define DS1621_ALARM_TEMP_LOW 0x20 | |
63 | ||
64 | /* Conversions. Rounding and limit checking is only done on the TO_REG | |
65 | variants. Note that you should be a bit careful with which arguments | |
66 | these macros are called: arguments may be evaluated more than once. | |
67 | Fixing this is just not worth it. */ | |
68 | #define ALARMS_FROM_REG(val) ((val) & \ | |
69 | (DS1621_ALARM_TEMP_HIGH | DS1621_ALARM_TEMP_LOW)) | |
70 | ||
71 | /* Each client has this additional data */ | |
72 | struct ds1621_data { | |
73 | struct i2c_client client; | |
943b0830 | 74 | struct class_device *class_dev; |
1da177e4 LT |
75 | struct semaphore update_lock; |
76 | char valid; /* !=0 if following fields are valid */ | |
77 | unsigned long last_updated; /* In jiffies */ | |
78 | ||
79 | u16 temp, temp_min, temp_max; /* Register values, word */ | |
80 | u8 conf; /* Register encoding, combined */ | |
81 | }; | |
82 | ||
83 | static int ds1621_attach_adapter(struct i2c_adapter *adapter); | |
84 | static int ds1621_detect(struct i2c_adapter *adapter, int address, | |
85 | int kind); | |
86 | static void ds1621_init_client(struct i2c_client *client); | |
87 | static int ds1621_detach_client(struct i2c_client *client); | |
88 | static struct ds1621_data *ds1621_update_client(struct device *dev); | |
89 | ||
90 | /* This is the driver that will be inserted */ | |
91 | static struct i2c_driver ds1621_driver = { | |
92 | .owner = THIS_MODULE, | |
93 | .name = "ds1621", | |
94 | .id = I2C_DRIVERID_DS1621, | |
95 | .flags = I2C_DF_NOTIFY, | |
96 | .attach_adapter = ds1621_attach_adapter, | |
97 | .detach_client = ds1621_detach_client, | |
98 | }; | |
99 | ||
100 | /* All registers are word-sized, except for the configuration register. | |
101 | DS1621 uses a high-byte first convention, which is exactly opposite to | |
102 | the usual practice. */ | |
103 | static int ds1621_read_value(struct i2c_client *client, u8 reg) | |
104 | { | |
105 | if (reg == DS1621_REG_CONF) | |
106 | return i2c_smbus_read_byte_data(client, reg); | |
107 | else | |
108 | return swab16(i2c_smbus_read_word_data(client, reg)); | |
109 | } | |
110 | ||
111 | /* All registers are word-sized, except for the configuration register. | |
112 | DS1621 uses a high-byte first convention, which is exactly opposite to | |
113 | the usual practice. */ | |
114 | static int ds1621_write_value(struct i2c_client *client, u8 reg, u16 value) | |
115 | { | |
116 | if (reg == DS1621_REG_CONF) | |
117 | return i2c_smbus_write_byte_data(client, reg, value); | |
118 | else | |
119 | return i2c_smbus_write_word_data(client, reg, swab16(value)); | |
120 | } | |
121 | ||
122 | static void ds1621_init_client(struct i2c_client *client) | |
123 | { | |
124 | int reg = ds1621_read_value(client, DS1621_REG_CONF); | |
44bbe87e | 125 | /* switch to continuous conversion mode */ |
1da177e4 LT |
126 | reg &= ~ DS1621_REG_CONFIG_1SHOT; |
127 | ||
128 | /* setup output polarity */ | |
129 | if (polarity == 0) | |
130 | reg &= ~DS1621_REG_CONFIG_POLARITY; | |
131 | else if (polarity == 1) | |
132 | reg |= DS1621_REG_CONFIG_POLARITY; | |
133 | ||
134 | ds1621_write_value(client, DS1621_REG_CONF, reg); | |
135 | ||
136 | /* start conversion */ | |
137 | i2c_smbus_write_byte(client, DS1621_COM_START); | |
138 | } | |
139 | ||
140 | #define show(value) \ | |
30f74292 | 141 | static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
142 | { \ |
143 | struct ds1621_data *data = ds1621_update_client(dev); \ | |
144 | return sprintf(buf, "%d\n", LM75_TEMP_FROM_REG(data->value)); \ | |
145 | } | |
146 | ||
147 | show(temp); | |
148 | show(temp_min); | |
149 | show(temp_max); | |
150 | ||
151 | #define set_temp(suffix, value, reg) \ | |
30f74292 | 152 | static ssize_t set_temp_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \ |
1da177e4 LT |
153 | size_t count) \ |
154 | { \ | |
155 | struct i2c_client *client = to_i2c_client(dev); \ | |
156 | struct ds1621_data *data = ds1621_update_client(dev); \ | |
157 | u16 val = LM75_TEMP_TO_REG(simple_strtoul(buf, NULL, 10)); \ | |
158 | \ | |
159 | down(&data->update_lock); \ | |
160 | data->value = val; \ | |
161 | ds1621_write_value(client, reg, data->value); \ | |
162 | up(&data->update_lock); \ | |
163 | return count; \ | |
164 | } | |
165 | ||
166 | set_temp(min, temp_min, DS1621_REG_TEMP_MIN); | |
167 | set_temp(max, temp_max, DS1621_REG_TEMP_MAX); | |
168 | ||
30f74292 | 169 | static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
170 | { |
171 | struct ds1621_data *data = ds1621_update_client(dev); | |
172 | return sprintf(buf, "%d\n", ALARMS_FROM_REG(data->conf)); | |
173 | } | |
174 | ||
175 | static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); | |
176 | static DEVICE_ATTR(temp1_input, S_IRUGO , show_temp, NULL); | |
177 | static DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO , show_temp_min, set_temp_min); | |
178 | static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max, set_temp_max); | |
179 | ||
180 | ||
181 | static int ds1621_attach_adapter(struct i2c_adapter *adapter) | |
182 | { | |
2ed2dc3c | 183 | return i2c_probe(adapter, &addr_data, ds1621_detect); |
1da177e4 LT |
184 | } |
185 | ||
2ed2dc3c | 186 | /* This function is called by i2c_probe */ |
1da177e4 LT |
187 | int ds1621_detect(struct i2c_adapter *adapter, int address, |
188 | int kind) | |
189 | { | |
190 | int conf, temp; | |
191 | struct i2c_client *new_client; | |
192 | struct ds1621_data *data; | |
193 | int err = 0; | |
194 | ||
195 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | |
196 | | I2C_FUNC_SMBUS_WORD_DATA | |
197 | | I2C_FUNC_SMBUS_WRITE_BYTE)) | |
198 | goto exit; | |
199 | ||
200 | /* OK. For now, we presume we have a valid client. We now create the | |
201 | client structure, even though we cannot fill it completely yet. | |
202 | But it allows us to access ds1621_{read,write}_value. */ | |
203 | if (!(data = kmalloc(sizeof(struct ds1621_data), GFP_KERNEL))) { | |
204 | err = -ENOMEM; | |
205 | goto exit; | |
206 | } | |
207 | memset(data, 0, sizeof(struct ds1621_data)); | |
208 | ||
209 | new_client = &data->client; | |
210 | i2c_set_clientdata(new_client, data); | |
211 | new_client->addr = address; | |
212 | new_client->adapter = adapter; | |
213 | new_client->driver = &ds1621_driver; | |
214 | new_client->flags = 0; | |
215 | ||
216 | ||
217 | /* Now, we do the remaining detection. It is lousy. */ | |
218 | if (kind < 0) { | |
219 | /* The NVB bit should be low if no EEPROM write has been | |
220 | requested during the latest 10ms, which is highly | |
221 | improbable in our case. */ | |
222 | conf = ds1621_read_value(new_client, DS1621_REG_CONF); | |
223 | if (conf & DS1621_REG_CONFIG_NVB) | |
224 | goto exit_free; | |
225 | /* The 7 lowest bits of a temperature should always be 0. */ | |
226 | temp = ds1621_read_value(new_client, DS1621_REG_TEMP); | |
227 | if (temp & 0x007f) | |
228 | goto exit_free; | |
229 | temp = ds1621_read_value(new_client, DS1621_REG_TEMP_MIN); | |
230 | if (temp & 0x007f) | |
231 | goto exit_free; | |
232 | temp = ds1621_read_value(new_client, DS1621_REG_TEMP_MAX); | |
233 | if (temp & 0x007f) | |
234 | goto exit_free; | |
235 | } | |
236 | ||
237 | /* Determine the chip type - only one kind supported! */ | |
238 | if (kind <= 0) | |
239 | kind = ds1621; | |
240 | ||
241 | /* Fill in remaining client fields and put it into the global list */ | |
242 | strlcpy(new_client->name, "ds1621", I2C_NAME_SIZE); | |
243 | data->valid = 0; | |
244 | init_MUTEX(&data->update_lock); | |
245 | ||
246 | /* Tell the I2C layer a new client has arrived */ | |
247 | if ((err = i2c_attach_client(new_client))) | |
248 | goto exit_free; | |
249 | ||
250 | /* Initialize the DS1621 chip */ | |
251 | ds1621_init_client(new_client); | |
252 | ||
253 | /* Register sysfs hooks */ | |
943b0830 MH |
254 | data->class_dev = hwmon_device_register(&new_client->dev); |
255 | if (IS_ERR(data->class_dev)) { | |
256 | err = PTR_ERR(data->class_dev); | |
257 | goto exit_detach; | |
258 | } | |
259 | ||
1da177e4 LT |
260 | device_create_file(&new_client->dev, &dev_attr_alarms); |
261 | device_create_file(&new_client->dev, &dev_attr_temp1_input); | |
262 | device_create_file(&new_client->dev, &dev_attr_temp1_min); | |
263 | device_create_file(&new_client->dev, &dev_attr_temp1_max); | |
264 | ||
265 | return 0; | |
266 | ||
267 | /* OK, this is not exactly good programming practice, usually. But it is | |
268 | very code-efficient in this case. */ | |
943b0830 MH |
269 | exit_detach: |
270 | i2c_detach_client(new_client); | |
1da177e4 LT |
271 | exit_free: |
272 | kfree(data); | |
273 | exit: | |
274 | return err; | |
275 | } | |
276 | ||
277 | static int ds1621_detach_client(struct i2c_client *client) | |
278 | { | |
943b0830 | 279 | struct ds1621_data *data = i2c_get_clientdata(client); |
1da177e4 LT |
280 | int err; |
281 | ||
943b0830 MH |
282 | hwmon_device_unregister(data->class_dev); |
283 | ||
7bef5594 | 284 | if ((err = i2c_detach_client(client))) |
1da177e4 | 285 | return err; |
1da177e4 | 286 | |
943b0830 | 287 | kfree(data); |
1da177e4 LT |
288 | |
289 | return 0; | |
290 | } | |
291 | ||
292 | ||
293 | static struct ds1621_data *ds1621_update_client(struct device *dev) | |
294 | { | |
295 | struct i2c_client *client = to_i2c_client(dev); | |
296 | struct ds1621_data *data = i2c_get_clientdata(client); | |
297 | u8 new_conf; | |
298 | ||
299 | down(&data->update_lock); | |
300 | ||
301 | if (time_after(jiffies, data->last_updated + HZ + HZ / 2) | |
302 | || !data->valid) { | |
303 | ||
304 | dev_dbg(&client->dev, "Starting ds1621 update\n"); | |
305 | ||
306 | data->conf = ds1621_read_value(client, DS1621_REG_CONF); | |
307 | ||
308 | data->temp = ds1621_read_value(client, DS1621_REG_TEMP); | |
309 | ||
310 | data->temp_min = ds1621_read_value(client, | |
311 | DS1621_REG_TEMP_MIN); | |
312 | data->temp_max = ds1621_read_value(client, | |
313 | DS1621_REG_TEMP_MAX); | |
314 | ||
44bbe87e | 315 | /* reset alarms if necessary */ |
1da177e4 LT |
316 | new_conf = data->conf; |
317 | if (data->temp < data->temp_min) | |
318 | new_conf &= ~DS1621_ALARM_TEMP_LOW; | |
319 | if (data->temp > data->temp_max) | |
320 | new_conf &= ~DS1621_ALARM_TEMP_HIGH; | |
321 | if (data->conf != new_conf) | |
322 | ds1621_write_value(client, DS1621_REG_CONF, | |
323 | new_conf); | |
324 | ||
325 | data->last_updated = jiffies; | |
326 | data->valid = 1; | |
327 | } | |
328 | ||
329 | up(&data->update_lock); | |
330 | ||
331 | return data; | |
332 | } | |
333 | ||
334 | static int __init ds1621_init(void) | |
335 | { | |
336 | return i2c_add_driver(&ds1621_driver); | |
337 | } | |
338 | ||
339 | static void __exit ds1621_exit(void) | |
340 | { | |
341 | i2c_del_driver(&ds1621_driver); | |
342 | } | |
343 | ||
344 | ||
345 | MODULE_AUTHOR("Christian W. Zuckschwerdt <zany@triq.net>"); | |
346 | MODULE_DESCRIPTION("DS1621 driver"); | |
347 | MODULE_LICENSE("GPL"); | |
348 | ||
349 | module_init(ds1621_init); | |
350 | module_exit(ds1621_exit); |