diff options
Diffstat (limited to 'drivers/hwmon/emc1403.c')
-rw-r--r-- | drivers/hwmon/emc1403.c | 344 |
1 files changed, 344 insertions, 0 deletions
diff --git a/drivers/hwmon/emc1403.c b/drivers/hwmon/emc1403.c new file mode 100644 index 000000000000..0e4b5642638d --- /dev/null +++ b/drivers/hwmon/emc1403.c | |||
@@ -0,0 +1,344 @@ | |||
1 | /* | ||
2 | * emc1403.c - SMSC Thermal Driver | ||
3 | * | ||
4 | * Copyright (C) 2008 Intel Corp | ||
5 | * | ||
6 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | ||
7 | * | ||
8 | * This program is free software; you can redistribute it and/or modify | ||
9 | * it under the terms of the GNU General Public License as published by | ||
10 | * the Free Software Foundation; version 2 of the License. | ||
11 | * | ||
12 | * This program is distributed in the hope that it will be useful, but | ||
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | ||
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
15 | * General Public License for more details. | ||
16 | * | ||
17 | * You should have received a copy of the GNU General Public License along | ||
18 | * with this program; if not, write to the Free Software Foundation, Inc., | ||
19 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | ||
20 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | ||
21 | * | ||
22 | * TODO | ||
23 | * - cache alarm and critical limit registers | ||
24 | * - add emc1404 support | ||
25 | */ | ||
26 | |||
27 | #include <linux/module.h> | ||
28 | #include <linux/init.h> | ||
29 | #include <linux/slab.h> | ||
30 | #include <linux/i2c.h> | ||
31 | #include <linux/hwmon.h> | ||
32 | #include <linux/hwmon-sysfs.h> | ||
33 | #include <linux/err.h> | ||
34 | #include <linux/sysfs.h> | ||
35 | #include <linux/mutex.h> | ||
36 | |||
37 | #define THERMAL_PID_REG 0xfd | ||
38 | #define THERMAL_SMSC_ID_REG 0xfe | ||
39 | #define THERMAL_REVISION_REG 0xff | ||
40 | |||
41 | struct thermal_data { | ||
42 | struct device *hwmon_dev; | ||
43 | struct mutex mutex; | ||
44 | /* Cache the hyst value so we don't keep re-reading it. In theory | ||
45 | we could cache it forever as nobody else should be writing it. */ | ||
46 | u8 cached_hyst; | ||
47 | unsigned long hyst_valid; | ||
48 | }; | ||
49 | |||
50 | static ssize_t show_temp(struct device *dev, | ||
51 | struct device_attribute *attr, char *buf) | ||
52 | { | ||
53 | struct i2c_client *client = to_i2c_client(dev); | ||
54 | struct sensor_device_attribute *sda = to_sensor_dev_attr(attr); | ||
55 | int retval = i2c_smbus_read_byte_data(client, sda->index); | ||
56 | |||
57 | if (retval < 0) | ||
58 | return retval; | ||
59 | return sprintf(buf, "%d000\n", retval); | ||
60 | } | ||
61 | |||
62 | static ssize_t show_bit(struct device *dev, | ||
63 | struct device_attribute *attr, char *buf) | ||
64 | { | ||
65 | struct i2c_client *client = to_i2c_client(dev); | ||
66 | struct sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr); | ||
67 | int retval = i2c_smbus_read_byte_data(client, sda->nr); | ||
68 | |||
69 | if (retval < 0) | ||
70 | return retval; | ||
71 | retval &= sda->index; | ||
72 | return sprintf(buf, "%d\n", retval ? 1 : 0); | ||
73 | } | ||
74 | |||
75 | static ssize_t store_temp(struct device *dev, | ||
76 | struct device_attribute *attr, const char *buf, size_t count) | ||
77 | { | ||
78 | struct sensor_device_attribute *sda = to_sensor_dev_attr(attr); | ||
79 | struct i2c_client *client = to_i2c_client(dev); | ||
80 | unsigned long val; | ||
81 | int retval; | ||
82 | |||
83 | if (strict_strtoul(buf, 10, &val)) | ||
84 | return -EINVAL; | ||
85 | retval = i2c_smbus_write_byte_data(client, sda->index, | ||
86 | DIV_ROUND_CLOSEST(val, 1000)); | ||
87 | if (retval < 0) | ||
88 | return retval; | ||
89 | return count; | ||
90 | } | ||
91 | |||
92 | static ssize_t show_hyst(struct device *dev, | ||
93 | struct device_attribute *attr, char *buf) | ||
94 | { | ||
95 | struct i2c_client *client = to_i2c_client(dev); | ||
96 | struct thermal_data *data = i2c_get_clientdata(client); | ||
97 | struct sensor_device_attribute *sda = to_sensor_dev_attr(attr); | ||
98 | int retval; | ||
99 | int hyst; | ||
100 | |||
101 | retval = i2c_smbus_read_byte_data(client, sda->index); | ||
102 | if (retval < 0) | ||
103 | return retval; | ||
104 | |||
105 | if (time_after(jiffies, data->hyst_valid)) { | ||
106 | hyst = i2c_smbus_read_byte_data(client, 0x21); | ||
107 | if (hyst < 0) | ||
108 | return retval; | ||
109 | data->cached_hyst = hyst; | ||
110 | data->hyst_valid = jiffies + HZ; | ||
111 | } | ||
112 | return sprintf(buf, "%d000\n", retval - data->cached_hyst); | ||
113 | } | ||
114 | |||
115 | static ssize_t store_hyst(struct device *dev, | ||
116 | struct device_attribute *attr, const char *buf, size_t count) | ||
117 | { | ||
118 | struct i2c_client *client = to_i2c_client(dev); | ||
119 | struct thermal_data *data = i2c_get_clientdata(client); | ||
120 | struct sensor_device_attribute *sda = to_sensor_dev_attr(attr); | ||
121 | int retval; | ||
122 | int hyst; | ||
123 | unsigned long val; | ||
124 | |||
125 | if (strict_strtoul(buf, 10, &val)) | ||
126 | return -EINVAL; | ||
127 | |||
128 | mutex_lock(&data->mutex); | ||
129 | retval = i2c_smbus_read_byte_data(client, sda->index); | ||
130 | if (retval < 0) | ||
131 | goto fail; | ||
132 | |||
133 | hyst = val - retval * 1000; | ||
134 | hyst = DIV_ROUND_CLOSEST(hyst, 1000); | ||
135 | if (hyst < 0 || hyst > 255) { | ||
136 | retval = -ERANGE; | ||
137 | goto fail; | ||
138 | } | ||
139 | |||
140 | retval = i2c_smbus_write_byte_data(client, 0x21, hyst); | ||
141 | if (retval == 0) { | ||
142 | retval = count; | ||
143 | data->cached_hyst = hyst; | ||
144 | data->hyst_valid = jiffies + HZ; | ||
145 | } | ||
146 | fail: | ||
147 | mutex_unlock(&data->mutex); | ||
148 | return retval; | ||
149 | } | ||
150 | |||
151 | /* | ||
152 | * Sensors. We pass the actual i2c register to the methods. | ||
153 | */ | ||
154 | |||
155 | static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO | S_IWUSR, | ||
156 | show_temp, store_temp, 0x06); | ||
157 | static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, | ||
158 | show_temp, store_temp, 0x05); | ||
159 | static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO | S_IWUSR, | ||
160 | show_temp, store_temp, 0x20); | ||
161 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0x00); | ||
162 | static SENSOR_DEVICE_ATTR_2(temp1_min_alarm, S_IRUGO, | ||
163 | show_bit, NULL, 0x36, 0x01); | ||
164 | static SENSOR_DEVICE_ATTR_2(temp1_max_alarm, S_IRUGO, | ||
165 | show_bit, NULL, 0x35, 0x01); | ||
166 | static SENSOR_DEVICE_ATTR_2(temp1_crit_alarm, S_IRUGO, | ||
167 | show_bit, NULL, 0x37, 0x01); | ||
168 | static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO | S_IWUSR, | ||
169 | show_hyst, store_hyst, 0x20); | ||
170 | |||
171 | static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO | S_IWUSR, | ||
172 | show_temp, store_temp, 0x08); | ||
173 | static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO | S_IWUSR, | ||
174 | show_temp, store_temp, 0x07); | ||
175 | static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO | S_IWUSR, | ||
176 | show_temp, store_temp, 0x19); | ||
177 | static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 0x01); | ||
178 | static SENSOR_DEVICE_ATTR_2(temp2_min_alarm, S_IRUGO, | ||
179 | show_bit, NULL, 0x36, 0x02); | ||
180 | static SENSOR_DEVICE_ATTR_2(temp2_max_alarm, S_IRUGO, | ||
181 | show_bit, NULL, 0x35, 0x02); | ||
182 | static SENSOR_DEVICE_ATTR_2(temp2_crit_alarm, S_IRUGO, | ||
183 | show_bit, NULL, 0x37, 0x02); | ||
184 | static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO | S_IWUSR, | ||
185 | show_hyst, store_hyst, 0x19); | ||
186 | |||
187 | static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO | S_IWUSR, | ||
188 | show_temp, store_temp, 0x16); | ||
189 | static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO | S_IWUSR, | ||
190 | show_temp, store_temp, 0x15); | ||
191 | static SENSOR_DEVICE_ATTR(temp3_crit, S_IRUGO | S_IWUSR, | ||
192 | show_temp, store_temp, 0x1A); | ||
193 | static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 0x23); | ||
194 | static SENSOR_DEVICE_ATTR_2(temp3_min_alarm, S_IRUGO, | ||
195 | show_bit, NULL, 0x36, 0x04); | ||
196 | static SENSOR_DEVICE_ATTR_2(temp3_max_alarm, S_IRUGO, | ||
197 | show_bit, NULL, 0x35, 0x04); | ||
198 | static SENSOR_DEVICE_ATTR_2(temp3_crit_alarm, S_IRUGO, | ||
199 | show_bit, NULL, 0x37, 0x04); | ||
200 | static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO | S_IWUSR, | ||
201 | show_hyst, store_hyst, 0x1A); | ||
202 | |||
203 | static struct attribute *mid_att_thermal[] = { | ||
204 | &sensor_dev_attr_temp1_min.dev_attr.attr, | ||
205 | &sensor_dev_attr_temp1_max.dev_attr.attr, | ||
206 | &sensor_dev_attr_temp1_crit.dev_attr.attr, | ||
207 | &sensor_dev_attr_temp1_input.dev_attr.attr, | ||
208 | &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, | ||
209 | &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, | ||
210 | &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, | ||
211 | &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr, | ||
212 | &sensor_dev_attr_temp2_min.dev_attr.attr, | ||
213 | &sensor_dev_attr_temp2_max.dev_attr.attr, | ||
214 | &sensor_dev_attr_temp2_crit.dev_attr.attr, | ||
215 | &sensor_dev_attr_temp2_input.dev_attr.attr, | ||
216 | &sensor_dev_attr_temp2_min_alarm.dev_attr.attr, | ||
217 | &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, | ||
218 | &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr, | ||
219 | &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr, | ||
220 | &sensor_dev_attr_temp3_min.dev_attr.attr, | ||
221 | &sensor_dev_attr_temp3_max.dev_attr.attr, | ||
222 | &sensor_dev_attr_temp3_crit.dev_attr.attr, | ||
223 | &sensor_dev_attr_temp3_input.dev_attr.attr, | ||
224 | &sensor_dev_attr_temp3_min_alarm.dev_attr.attr, | ||
225 | &sensor_dev_attr_temp3_max_alarm.dev_attr.attr, | ||
226 | &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr, | ||
227 | &sensor_dev_attr_temp3_crit_hyst.dev_attr.attr, | ||
228 | NULL | ||
229 | }; | ||
230 | |||
231 | static const struct attribute_group m_thermal_gr = { | ||
232 | .attrs = mid_att_thermal | ||
233 | }; | ||
234 | |||
235 | static int emc1403_detect(struct i2c_client *client, | ||
236 | struct i2c_board_info *info) | ||
237 | { | ||
238 | int id; | ||
239 | /* Check if thermal chip is SMSC and EMC1403 */ | ||
240 | |||
241 | id = i2c_smbus_read_byte_data(client, THERMAL_SMSC_ID_REG); | ||
242 | if (id != 0x5d) | ||
243 | return -ENODEV; | ||
244 | |||
245 | /* Note: 0x25 is the 1404 which is very similar and this | ||
246 | driver could be extended */ | ||
247 | id = i2c_smbus_read_byte_data(client, THERMAL_PID_REG); | ||
248 | if (id != 0x21) | ||
249 | return -ENODEV; | ||
250 | |||
251 | id = i2c_smbus_read_byte_data(client, THERMAL_REVISION_REG); | ||
252 | if (id != 0x01) | ||
253 | return -ENODEV; | ||
254 | |||
255 | strlcpy(info->type, "emc1403", I2C_NAME_SIZE); | ||
256 | return 0; | ||
257 | } | ||
258 | |||
259 | static int emc1403_probe(struct i2c_client *client, | ||
260 | const struct i2c_device_id *id) | ||
261 | { | ||
262 | int res; | ||
263 | struct thermal_data *data; | ||
264 | |||
265 | data = kzalloc(sizeof(struct thermal_data), GFP_KERNEL); | ||
266 | if (data == NULL) { | ||
267 | dev_warn(&client->dev, "out of memory"); | ||
268 | return -ENOMEM; | ||
269 | } | ||
270 | |||
271 | i2c_set_clientdata(client, data); | ||
272 | mutex_init(&data->mutex); | ||
273 | data->hyst_valid = jiffies - 1; /* Expired */ | ||
274 | |||
275 | res = sysfs_create_group(&client->dev.kobj, &m_thermal_gr); | ||
276 | if (res) { | ||
277 | dev_warn(&client->dev, "create group failed\n"); | ||
278 | hwmon_device_unregister(data->hwmon_dev); | ||
279 | goto thermal_error1; | ||
280 | } | ||
281 | data->hwmon_dev = hwmon_device_register(&client->dev); | ||
282 | if (IS_ERR(data->hwmon_dev)) { | ||
283 | res = PTR_ERR(data->hwmon_dev); | ||
284 | dev_warn(&client->dev, "register hwmon dev failed\n"); | ||
285 | goto thermal_error2; | ||
286 | } | ||
287 | dev_info(&client->dev, "EMC1403 Thermal chip found\n"); | ||
288 | return res; | ||
289 | |||
290 | thermal_error2: | ||
291 | sysfs_remove_group(&client->dev.kobj, &m_thermal_gr); | ||
292 | thermal_error1: | ||
293 | kfree(data); | ||
294 | return res; | ||
295 | } | ||
296 | |||
297 | static int emc1403_remove(struct i2c_client *client) | ||
298 | { | ||
299 | struct thermal_data *data = i2c_get_clientdata(client); | ||
300 | |||
301 | hwmon_device_unregister(data->hwmon_dev); | ||
302 | sysfs_remove_group(&client->dev.kobj, &m_thermal_gr); | ||
303 | kfree(data); | ||
304 | return 0; | ||
305 | } | ||
306 | |||
307 | static const unsigned short emc1403_address_list[] = { | ||
308 | 0x18, 0x2a, 0x4c, 0x4d, I2C_CLIENT_END | ||
309 | }; | ||
310 | |||
311 | static const struct i2c_device_id emc1403_idtable[] = { | ||
312 | { "emc1403", 0 }, | ||
313 | { } | ||
314 | }; | ||
315 | MODULE_DEVICE_TABLE(i2c, emc1403_idtable); | ||
316 | |||
317 | static struct i2c_driver sensor_emc1403 = { | ||
318 | .class = I2C_CLASS_HWMON, | ||
319 | .driver = { | ||
320 | .name = "emc1403", | ||
321 | }, | ||
322 | .detect = emc1403_detect, | ||
323 | .probe = emc1403_probe, | ||
324 | .remove = emc1403_remove, | ||
325 | .id_table = emc1403_idtable, | ||
326 | .address_list = emc1403_address_list, | ||
327 | }; | ||
328 | |||
329 | static int __init sensor_emc1403_init(void) | ||
330 | { | ||
331 | return i2c_add_driver(&sensor_emc1403); | ||
332 | } | ||
333 | |||
334 | static void __exit sensor_emc1403_exit(void) | ||
335 | { | ||
336 | i2c_del_driver(&sensor_emc1403); | ||
337 | } | ||
338 | |||
339 | module_init(sensor_emc1403_init); | ||
340 | module_exit(sensor_emc1403_exit); | ||
341 | |||
342 | MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com"); | ||
343 | MODULE_DESCRIPTION("emc1403 Thermal Driver"); | ||
344 | MODULE_LICENSE("GPL v2"); | ||