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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 | static void ds1621_init_client(struct i2c_client *client) |
84 | { |
85 | u8 conf, new_conf; |
86 | |
87 | new_conf = conf = i2c_smbus_read_byte_data(client, DS1621_REG_CONF); |
88 | /* switch to continuous conversion mode */ |
89 | new_conf &= ~DS1621_REG_CONFIG_1SHOT; |
90 | |
91 | /* setup output polarity */ |
92 | if (polarity == 0) |
93 | new_conf &= ~DS1621_REG_CONFIG_POLARITY; |
94 | else if (polarity == 1) |
95 | new_conf |= DS1621_REG_CONFIG_POLARITY; |
96 | |
97 | if (conf != new_conf) |
98 | i2c_smbus_write_byte_data(client, DS1621_REG_CONF, new_conf); |
99 | |
100 | /* start conversion */ |
101 | i2c_smbus_write_byte(client, DS1621_COM_START); |
102 | } |
103 | |
104 | static struct ds1621_data *ds1621_update_client(struct device *dev) |
105 | { |
106 | struct i2c_client *client = to_i2c_client(dev); |
107 | struct ds1621_data *data = i2c_get_clientdata(client); |
108 | u8 new_conf; |
109 | |
110 | mutex_lock(&data->update_lock); |
111 | |
112 | if (time_after(jiffies, data->last_updated + HZ + HZ / 2) |
113 | || !data->valid) { |
114 | int i; |
115 | |
116 | dev_dbg(&client->dev, "Starting ds1621 update\n"); |
117 | |
118 | data->conf = i2c_smbus_read_byte_data(client, DS1621_REG_CONF); |
119 | |
120 | for (i = 0; i < ARRAY_SIZE(data->temp); i++) |
121 | data->temp[i] = i2c_smbus_read_word_swapped(client, |
122 | DS1621_REG_TEMP[i]); |
123 | |
124 | /* reset alarms if necessary */ |
125 | new_conf = data->conf; |
126 | if (data->temp[0] > data->temp[1]) /* input > min */ |
127 | new_conf &= ~DS1621_ALARM_TEMP_LOW; |
128 | if (data->temp[0] < data->temp[2]) /* input < max */ |
129 | new_conf &= ~DS1621_ALARM_TEMP_HIGH; |
130 | if (data->conf != new_conf) |
131 | i2c_smbus_write_byte_data(client, DS1621_REG_CONF, |
132 | new_conf); |
133 | |
134 | data->last_updated = jiffies; |
135 | data->valid = 1; |
136 | } |
137 | |
138 | mutex_unlock(&data->update_lock); |
139 | |
140 | return data; |
141 | } |
142 | |
143 | static ssize_t show_temp(struct device *dev, struct device_attribute *da, |
144 | char *buf) |
145 | { |
146 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
147 | struct ds1621_data *data = ds1621_update_client(dev); |
148 | return sprintf(buf, "%d\n", |
149 | LM75_TEMP_FROM_REG(data->temp[attr->index])); |
150 | } |
151 | |
152 | static ssize_t set_temp(struct device *dev, struct device_attribute *da, |
153 | const char *buf, size_t count) |
154 | { |
155 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
156 | struct i2c_client *client = to_i2c_client(dev); |
157 | struct ds1621_data *data = i2c_get_clientdata(client); |
158 | long val; |
159 | int err; |
160 | |
161 | err = kstrtol(buf, 10, &val); |
162 | if (err) |
163 | return err; |
164 | |
165 | mutex_lock(&data->update_lock); |
166 | data->temp[attr->index] = LM75_TEMP_TO_REG(val); |
167 | i2c_smbus_write_word_swapped(client, DS1621_REG_TEMP[attr->index], |
168 | data->temp[attr->index]); |
169 | mutex_unlock(&data->update_lock); |
170 | return count; |
171 | } |
172 | |
173 | static ssize_t show_alarms(struct device *dev, struct device_attribute *da, |
174 | char *buf) |
175 | { |
176 | struct ds1621_data *data = ds1621_update_client(dev); |
177 | return sprintf(buf, "%d\n", ALARMS_FROM_REG(data->conf)); |
178 | } |
179 | |
180 | static ssize_t show_alarm(struct device *dev, struct device_attribute *da, |
181 | char *buf) |
182 | { |
183 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
184 | struct ds1621_data *data = ds1621_update_client(dev); |
185 | return sprintf(buf, "%d\n", !!(data->conf & attr->index)); |
186 | } |
187 | |
188 | static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); |
189 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); |
190 | static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp, set_temp, 1); |
191 | static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp, set_temp, 2); |
192 | static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, |
193 | DS1621_ALARM_TEMP_LOW); |
194 | static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, |
195 | DS1621_ALARM_TEMP_HIGH); |
196 | |
197 | static struct attribute *ds1621_attributes[] = { |
198 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
199 | &sensor_dev_attr_temp1_min.dev_attr.attr, |
200 | &sensor_dev_attr_temp1_max.dev_attr.attr, |
201 | &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, |
202 | &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, |
203 | &dev_attr_alarms.attr, |
204 | NULL |
205 | }; |
206 | |
207 | static const struct attribute_group ds1621_group = { |
208 | .attrs = ds1621_attributes, |
209 | }; |
210 | |
211 | |
212 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
213 | static int ds1621_detect(struct i2c_client *client, |
214 | struct i2c_board_info *info) |
215 | { |
216 | struct i2c_adapter *adapter = client->adapter; |
217 | int conf, temp; |
218 | int i; |
219 | |
220 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
221 | | I2C_FUNC_SMBUS_WORD_DATA |
222 | | I2C_FUNC_SMBUS_WRITE_BYTE)) |
223 | return -ENODEV; |
224 | |
225 | /* |
226 | * Now, we do the remaining detection. It is lousy. |
227 | * |
228 | * The NVB bit should be low if no EEPROM write has been requested |
229 | * during the latest 10ms, which is highly improbable in our case. |
230 | */ |
231 | conf = i2c_smbus_read_byte_data(client, DS1621_REG_CONF); |
232 | if (conf < 0 || conf & DS1621_REG_CONFIG_NVB) |
233 | return -ENODEV; |
234 | /* The 7 lowest bits of a temperature should always be 0. */ |
235 | for (i = 0; i < ARRAY_SIZE(DS1621_REG_TEMP); i++) { |
236 | temp = i2c_smbus_read_word_data(client, DS1621_REG_TEMP[i]); |
237 | if (temp < 0 || (temp & 0x7f00)) |
238 | return -ENODEV; |
239 | } |
240 | |
241 | strlcpy(info->type, "ds1621", I2C_NAME_SIZE); |
242 | |
243 | return 0; |
244 | } |
245 | |
246 | static int ds1621_probe(struct i2c_client *client, |
247 | const struct i2c_device_id *id) |
248 | { |
249 | struct ds1621_data *data; |
250 | int err; |
251 | |
252 | data = devm_kzalloc(&client->dev, sizeof(struct ds1621_data), |
253 | GFP_KERNEL); |
254 | if (!data) |
255 | return -ENOMEM; |
256 | |
257 | i2c_set_clientdata(client, data); |
258 | mutex_init(&data->update_lock); |
259 | |
260 | /* Initialize the DS1621 chip */ |
261 | ds1621_init_client(client); |
262 | |
263 | /* Register sysfs hooks */ |
264 | err = sysfs_create_group(&client->dev.kobj, &ds1621_group); |
265 | if (err) |
266 | return err; |
267 | |
268 | data->hwmon_dev = hwmon_device_register(&client->dev); |
269 | if (IS_ERR(data->hwmon_dev)) { |
270 | err = PTR_ERR(data->hwmon_dev); |
271 | goto exit_remove_files; |
272 | } |
273 | |
274 | return 0; |
275 | |
276 | exit_remove_files: |
277 | sysfs_remove_group(&client->dev.kobj, &ds1621_group); |
278 | return err; |
279 | } |
280 | |
281 | static int ds1621_remove(struct i2c_client *client) |
282 | { |
283 | struct ds1621_data *data = i2c_get_clientdata(client); |
284 | |
285 | hwmon_device_unregister(data->hwmon_dev); |
286 | sysfs_remove_group(&client->dev.kobj, &ds1621_group); |
287 | |
288 | return 0; |
289 | } |
290 | |
291 | static const struct i2c_device_id ds1621_id[] = { |
292 | { "ds1621", 0 }, |
293 | { "ds1625", 0 }, |
294 | { } |
295 | }; |
296 | MODULE_DEVICE_TABLE(i2c, ds1621_id); |
297 | |
298 | /* This is the driver that will be inserted */ |
299 | static struct i2c_driver ds1621_driver = { |
300 | .class = I2C_CLASS_HWMON, |
301 | .driver = { |
302 | .name = "ds1621", |
303 | }, |
304 | .probe = ds1621_probe, |
305 | .remove = ds1621_remove, |
306 | .id_table = ds1621_id, |
307 | .detect = ds1621_detect, |
308 | .address_list = normal_i2c, |
309 | }; |
310 | |
311 | module_i2c_driver(ds1621_driver); |
312 | |
313 | MODULE_AUTHOR("Christian W. Zuckschwerdt <zany@triq.net>"); |
314 | MODULE_DESCRIPTION("DS1621 driver"); |
315 | MODULE_LICENSE("GPL"); |
316 |
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