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dac6831e KT |
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"); |