Commit | Line | Data |
---|---|---|
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; | |
4bebced8 GR |
44 | /* |
45 | * Cache the hyst value so we don't keep re-reading it. In theory | |
46 | * we could cache it forever as nobody else should be writing it. | |
47 | */ | |
dac6831e KT |
48 | u8 cached_hyst; |
49 | unsigned long hyst_valid; | |
50 | }; | |
51 | ||
52 | static ssize_t show_temp(struct device *dev, | |
53 | struct device_attribute *attr, char *buf) | |
54 | { | |
55 | struct i2c_client *client = to_i2c_client(dev); | |
56 | struct sensor_device_attribute *sda = to_sensor_dev_attr(attr); | |
57 | int retval = i2c_smbus_read_byte_data(client, sda->index); | |
58 | ||
59 | if (retval < 0) | |
60 | return retval; | |
61 | return sprintf(buf, "%d000\n", retval); | |
62 | } | |
63 | ||
64 | static ssize_t show_bit(struct device *dev, | |
65 | struct device_attribute *attr, char *buf) | |
66 | { | |
67 | struct i2c_client *client = to_i2c_client(dev); | |
68 | struct sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr); | |
69 | int retval = i2c_smbus_read_byte_data(client, sda->nr); | |
70 | ||
71 | if (retval < 0) | |
72 | return retval; | |
73 | retval &= sda->index; | |
74 | return sprintf(buf, "%d\n", retval ? 1 : 0); | |
75 | } | |
76 | ||
77 | static ssize_t store_temp(struct device *dev, | |
78 | struct device_attribute *attr, const char *buf, size_t count) | |
79 | { | |
80 | struct sensor_device_attribute *sda = to_sensor_dev_attr(attr); | |
81 | struct i2c_client *client = to_i2c_client(dev); | |
82 | unsigned long val; | |
83 | int retval; | |
84 | ||
179c4fdb | 85 | if (kstrtoul(buf, 10, &val)) |
dac6831e KT |
86 | return -EINVAL; |
87 | retval = i2c_smbus_write_byte_data(client, sda->index, | |
88 | DIV_ROUND_CLOSEST(val, 1000)); | |
89 | if (retval < 0) | |
90 | return retval; | |
91 | return count; | |
92 | } | |
93 | ||
960f12f4 AC |
94 | static ssize_t store_bit(struct device *dev, |
95 | struct device_attribute *attr, const char *buf, size_t count) | |
96 | { | |
97 | struct i2c_client *client = to_i2c_client(dev); | |
98 | struct thermal_data *data = i2c_get_clientdata(client); | |
99 | struct sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr); | |
100 | unsigned long val; | |
101 | int retval; | |
102 | ||
179c4fdb | 103 | if (kstrtoul(buf, 10, &val)) |
960f12f4 AC |
104 | return -EINVAL; |
105 | ||
106 | mutex_lock(&data->mutex); | |
107 | retval = i2c_smbus_read_byte_data(client, sda->nr); | |
108 | if (retval < 0) | |
109 | goto fail; | |
110 | ||
111 | retval &= ~sda->index; | |
112 | if (val) | |
113 | retval |= sda->index; | |
114 | ||
115 | retval = i2c_smbus_write_byte_data(client, sda->index, retval); | |
116 | if (retval == 0) | |
117 | retval = count; | |
118 | fail: | |
119 | mutex_unlock(&data->mutex); | |
120 | return retval; | |
121 | } | |
122 | ||
dac6831e KT |
123 | static ssize_t show_hyst(struct device *dev, |
124 | struct device_attribute *attr, char *buf) | |
125 | { | |
126 | struct i2c_client *client = to_i2c_client(dev); | |
127 | struct thermal_data *data = i2c_get_clientdata(client); | |
128 | struct sensor_device_attribute *sda = to_sensor_dev_attr(attr); | |
129 | int retval; | |
130 | int hyst; | |
131 | ||
132 | retval = i2c_smbus_read_byte_data(client, sda->index); | |
133 | if (retval < 0) | |
134 | return retval; | |
135 | ||
136 | if (time_after(jiffies, data->hyst_valid)) { | |
137 | hyst = i2c_smbus_read_byte_data(client, 0x21); | |
138 | if (hyst < 0) | |
139 | return retval; | |
140 | data->cached_hyst = hyst; | |
141 | data->hyst_valid = jiffies + HZ; | |
142 | } | |
143 | return sprintf(buf, "%d000\n", retval - data->cached_hyst); | |
144 | } | |
145 | ||
146 | static ssize_t store_hyst(struct device *dev, | |
147 | struct device_attribute *attr, const char *buf, size_t count) | |
148 | { | |
149 | struct i2c_client *client = to_i2c_client(dev); | |
150 | struct thermal_data *data = i2c_get_clientdata(client); | |
151 | struct sensor_device_attribute *sda = to_sensor_dev_attr(attr); | |
152 | int retval; | |
153 | int hyst; | |
154 | unsigned long val; | |
155 | ||
179c4fdb | 156 | if (kstrtoul(buf, 10, &val)) |
dac6831e KT |
157 | return -EINVAL; |
158 | ||
159 | mutex_lock(&data->mutex); | |
160 | retval = i2c_smbus_read_byte_data(client, sda->index); | |
161 | if (retval < 0) | |
162 | goto fail; | |
163 | ||
164 | hyst = val - retval * 1000; | |
165 | hyst = DIV_ROUND_CLOSEST(hyst, 1000); | |
166 | if (hyst < 0 || hyst > 255) { | |
167 | retval = -ERANGE; | |
168 | goto fail; | |
169 | } | |
170 | ||
171 | retval = i2c_smbus_write_byte_data(client, 0x21, hyst); | |
172 | if (retval == 0) { | |
173 | retval = count; | |
174 | data->cached_hyst = hyst; | |
175 | data->hyst_valid = jiffies + HZ; | |
176 | } | |
177 | fail: | |
178 | mutex_unlock(&data->mutex); | |
179 | return retval; | |
180 | } | |
181 | ||
182 | /* | |
183 | * Sensors. We pass the actual i2c register to the methods. | |
184 | */ | |
185 | ||
186 | static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO | S_IWUSR, | |
187 | show_temp, store_temp, 0x06); | |
188 | static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, | |
189 | show_temp, store_temp, 0x05); | |
190 | static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO | S_IWUSR, | |
191 | show_temp, store_temp, 0x20); | |
192 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0x00); | |
193 | static SENSOR_DEVICE_ATTR_2(temp1_min_alarm, S_IRUGO, | |
194 | show_bit, NULL, 0x36, 0x01); | |
195 | static SENSOR_DEVICE_ATTR_2(temp1_max_alarm, S_IRUGO, | |
196 | show_bit, NULL, 0x35, 0x01); | |
197 | static SENSOR_DEVICE_ATTR_2(temp1_crit_alarm, S_IRUGO, | |
198 | show_bit, NULL, 0x37, 0x01); | |
199 | static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO | S_IWUSR, | |
200 | show_hyst, store_hyst, 0x20); | |
201 | ||
202 | static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO | S_IWUSR, | |
203 | show_temp, store_temp, 0x08); | |
204 | static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO | S_IWUSR, | |
205 | show_temp, store_temp, 0x07); | |
206 | static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO | S_IWUSR, | |
207 | show_temp, store_temp, 0x19); | |
208 | static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 0x01); | |
209 | static SENSOR_DEVICE_ATTR_2(temp2_min_alarm, S_IRUGO, | |
210 | show_bit, NULL, 0x36, 0x02); | |
211 | static SENSOR_DEVICE_ATTR_2(temp2_max_alarm, S_IRUGO, | |
212 | show_bit, NULL, 0x35, 0x02); | |
213 | static SENSOR_DEVICE_ATTR_2(temp2_crit_alarm, S_IRUGO, | |
214 | show_bit, NULL, 0x37, 0x02); | |
215 | static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO | S_IWUSR, | |
216 | show_hyst, store_hyst, 0x19); | |
217 | ||
218 | static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO | S_IWUSR, | |
219 | show_temp, store_temp, 0x16); | |
220 | static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO | S_IWUSR, | |
221 | show_temp, store_temp, 0x15); | |
222 | static SENSOR_DEVICE_ATTR(temp3_crit, S_IRUGO | S_IWUSR, | |
223 | show_temp, store_temp, 0x1A); | |
224 | static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 0x23); | |
225 | static SENSOR_DEVICE_ATTR_2(temp3_min_alarm, S_IRUGO, | |
226 | show_bit, NULL, 0x36, 0x04); | |
227 | static SENSOR_DEVICE_ATTR_2(temp3_max_alarm, S_IRUGO, | |
228 | show_bit, NULL, 0x35, 0x04); | |
229 | static SENSOR_DEVICE_ATTR_2(temp3_crit_alarm, S_IRUGO, | |
230 | show_bit, NULL, 0x37, 0x04); | |
231 | static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO | S_IWUSR, | |
232 | show_hyst, store_hyst, 0x1A); | |
233 | ||
960f12f4 AC |
234 | static SENSOR_DEVICE_ATTR_2(power_state, S_IRUGO | S_IWUSR, |
235 | show_bit, store_bit, 0x03, 0x40); | |
236 | ||
dac6831e KT |
237 | static struct attribute *mid_att_thermal[] = { |
238 | &sensor_dev_attr_temp1_min.dev_attr.attr, | |
239 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
240 | &sensor_dev_attr_temp1_crit.dev_attr.attr, | |
241 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
242 | &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, | |
243 | &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, | |
244 | &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, | |
245 | &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr, | |
246 | &sensor_dev_attr_temp2_min.dev_attr.attr, | |
247 | &sensor_dev_attr_temp2_max.dev_attr.attr, | |
248 | &sensor_dev_attr_temp2_crit.dev_attr.attr, | |
249 | &sensor_dev_attr_temp2_input.dev_attr.attr, | |
250 | &sensor_dev_attr_temp2_min_alarm.dev_attr.attr, | |
251 | &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, | |
252 | &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr, | |
253 | &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr, | |
254 | &sensor_dev_attr_temp3_min.dev_attr.attr, | |
255 | &sensor_dev_attr_temp3_max.dev_attr.attr, | |
256 | &sensor_dev_attr_temp3_crit.dev_attr.attr, | |
257 | &sensor_dev_attr_temp3_input.dev_attr.attr, | |
258 | &sensor_dev_attr_temp3_min_alarm.dev_attr.attr, | |
259 | &sensor_dev_attr_temp3_max_alarm.dev_attr.attr, | |
260 | &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr, | |
261 | &sensor_dev_attr_temp3_crit_hyst.dev_attr.attr, | |
960f12f4 | 262 | &sensor_dev_attr_power_state.dev_attr.attr, |
dac6831e KT |
263 | NULL |
264 | }; | |
265 | ||
266 | static const struct attribute_group m_thermal_gr = { | |
267 | .attrs = mid_att_thermal | |
268 | }; | |
269 | ||
270 | static int emc1403_detect(struct i2c_client *client, | |
271 | struct i2c_board_info *info) | |
272 | { | |
273 | int id; | |
7a1b76f2 | 274 | /* Check if thermal chip is SMSC and EMC1403 or EMC1423 */ |
dac6831e KT |
275 | |
276 | id = i2c_smbus_read_byte_data(client, THERMAL_SMSC_ID_REG); | |
277 | if (id != 0x5d) | |
278 | return -ENODEV; | |
279 | ||
7a1b76f2 JL |
280 | id = i2c_smbus_read_byte_data(client, THERMAL_PID_REG); |
281 | switch (id) { | |
282 | case 0x21: | |
283 | strlcpy(info->type, "emc1403", I2C_NAME_SIZE); | |
284 | break; | |
285 | case 0x23: | |
286 | strlcpy(info->type, "emc1423", I2C_NAME_SIZE); | |
287 | break; | |
4bebced8 GR |
288 | /* |
289 | * Note: 0x25 is the 1404 which is very similar and this | |
290 | * driver could be extended | |
291 | */ | |
7a1b76f2 | 292 | default: |
dac6831e | 293 | return -ENODEV; |
7a1b76f2 | 294 | } |
dac6831e KT |
295 | |
296 | id = i2c_smbus_read_byte_data(client, THERMAL_REVISION_REG); | |
297 | if (id != 0x01) | |
298 | return -ENODEV; | |
299 | ||
dac6831e KT |
300 | return 0; |
301 | } | |
302 | ||
303 | static int emc1403_probe(struct i2c_client *client, | |
304 | const struct i2c_device_id *id) | |
305 | { | |
306 | int res; | |
307 | struct thermal_data *data; | |
308 | ||
309 | data = kzalloc(sizeof(struct thermal_data), GFP_KERNEL); | |
310 | if (data == NULL) { | |
311 | dev_warn(&client->dev, "out of memory"); | |
312 | return -ENOMEM; | |
313 | } | |
314 | ||
315 | i2c_set_clientdata(client, data); | |
316 | mutex_init(&data->mutex); | |
317 | data->hyst_valid = jiffies - 1; /* Expired */ | |
318 | ||
319 | res = sysfs_create_group(&client->dev.kobj, &m_thermal_gr); | |
320 | if (res) { | |
321 | dev_warn(&client->dev, "create group failed\n"); | |
dac6831e KT |
322 | goto thermal_error1; |
323 | } | |
324 | data->hwmon_dev = hwmon_device_register(&client->dev); | |
325 | if (IS_ERR(data->hwmon_dev)) { | |
326 | res = PTR_ERR(data->hwmon_dev); | |
327 | dev_warn(&client->dev, "register hwmon dev failed\n"); | |
328 | goto thermal_error2; | |
329 | } | |
330 | dev_info(&client->dev, "EMC1403 Thermal chip found\n"); | |
331 | return res; | |
332 | ||
333 | thermal_error2: | |
334 | sysfs_remove_group(&client->dev.kobj, &m_thermal_gr); | |
335 | thermal_error1: | |
336 | kfree(data); | |
337 | return res; | |
338 | } | |
339 | ||
340 | static int emc1403_remove(struct i2c_client *client) | |
341 | { | |
342 | struct thermal_data *data = i2c_get_clientdata(client); | |
343 | ||
344 | hwmon_device_unregister(data->hwmon_dev); | |
345 | sysfs_remove_group(&client->dev.kobj, &m_thermal_gr); | |
346 | kfree(data); | |
347 | return 0; | |
348 | } | |
349 | ||
350 | static const unsigned short emc1403_address_list[] = { | |
bcf721d1 | 351 | 0x18, 0x29, 0x4c, 0x4d, I2C_CLIENT_END |
dac6831e KT |
352 | }; |
353 | ||
354 | static const struct i2c_device_id emc1403_idtable[] = { | |
355 | { "emc1403", 0 }, | |
7a1b76f2 | 356 | { "emc1423", 0 }, |
dac6831e KT |
357 | { } |
358 | }; | |
359 | MODULE_DEVICE_TABLE(i2c, emc1403_idtable); | |
360 | ||
361 | static struct i2c_driver sensor_emc1403 = { | |
362 | .class = I2C_CLASS_HWMON, | |
363 | .driver = { | |
364 | .name = "emc1403", | |
365 | }, | |
366 | .detect = emc1403_detect, | |
367 | .probe = emc1403_probe, | |
368 | .remove = emc1403_remove, | |
369 | .id_table = emc1403_idtable, | |
370 | .address_list = emc1403_address_list, | |
371 | }; | |
372 | ||
f0967eea | 373 | module_i2c_driver(sensor_emc1403); |
dac6831e KT |
374 | |
375 | MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com"); | |
376 | MODULE_DESCRIPTION("emc1403 Thermal Driver"); | |
377 | MODULE_LICENSE("GPL v2"); |