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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 | ||
960f12f4 AC |
92 | static ssize_t store_bit(struct device *dev, |
93 | struct device_attribute *attr, const char *buf, size_t count) | |
94 | { | |
95 | struct i2c_client *client = to_i2c_client(dev); | |
96 | struct thermal_data *data = i2c_get_clientdata(client); | |
97 | struct sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr); | |
98 | unsigned long val; | |
99 | int retval; | |
100 | ||
101 | if (strict_strtoul(buf, 10, &val)) | |
102 | return -EINVAL; | |
103 | ||
104 | mutex_lock(&data->mutex); | |
105 | retval = i2c_smbus_read_byte_data(client, sda->nr); | |
106 | if (retval < 0) | |
107 | goto fail; | |
108 | ||
109 | retval &= ~sda->index; | |
110 | if (val) | |
111 | retval |= sda->index; | |
112 | ||
113 | retval = i2c_smbus_write_byte_data(client, sda->index, retval); | |
114 | if (retval == 0) | |
115 | retval = count; | |
116 | fail: | |
117 | mutex_unlock(&data->mutex); | |
118 | return retval; | |
119 | } | |
120 | ||
dac6831e KT |
121 | static ssize_t show_hyst(struct device *dev, |
122 | struct device_attribute *attr, char *buf) | |
123 | { | |
124 | struct i2c_client *client = to_i2c_client(dev); | |
125 | struct thermal_data *data = i2c_get_clientdata(client); | |
126 | struct sensor_device_attribute *sda = to_sensor_dev_attr(attr); | |
127 | int retval; | |
128 | int hyst; | |
129 | ||
130 | retval = i2c_smbus_read_byte_data(client, sda->index); | |
131 | if (retval < 0) | |
132 | return retval; | |
133 | ||
134 | if (time_after(jiffies, data->hyst_valid)) { | |
135 | hyst = i2c_smbus_read_byte_data(client, 0x21); | |
136 | if (hyst < 0) | |
137 | return retval; | |
138 | data->cached_hyst = hyst; | |
139 | data->hyst_valid = jiffies + HZ; | |
140 | } | |
141 | return sprintf(buf, "%d000\n", retval - data->cached_hyst); | |
142 | } | |
143 | ||
144 | static ssize_t store_hyst(struct device *dev, | |
145 | struct device_attribute *attr, const char *buf, size_t count) | |
146 | { | |
147 | struct i2c_client *client = to_i2c_client(dev); | |
148 | struct thermal_data *data = i2c_get_clientdata(client); | |
149 | struct sensor_device_attribute *sda = to_sensor_dev_attr(attr); | |
150 | int retval; | |
151 | int hyst; | |
152 | unsigned long val; | |
153 | ||
154 | if (strict_strtoul(buf, 10, &val)) | |
155 | return -EINVAL; | |
156 | ||
157 | mutex_lock(&data->mutex); | |
158 | retval = i2c_smbus_read_byte_data(client, sda->index); | |
159 | if (retval < 0) | |
160 | goto fail; | |
161 | ||
162 | hyst = val - retval * 1000; | |
163 | hyst = DIV_ROUND_CLOSEST(hyst, 1000); | |
164 | if (hyst < 0 || hyst > 255) { | |
165 | retval = -ERANGE; | |
166 | goto fail; | |
167 | } | |
168 | ||
169 | retval = i2c_smbus_write_byte_data(client, 0x21, hyst); | |
170 | if (retval == 0) { | |
171 | retval = count; | |
172 | data->cached_hyst = hyst; | |
173 | data->hyst_valid = jiffies + HZ; | |
174 | } | |
175 | fail: | |
176 | mutex_unlock(&data->mutex); | |
177 | return retval; | |
178 | } | |
179 | ||
180 | /* | |
181 | * Sensors. We pass the actual i2c register to the methods. | |
182 | */ | |
183 | ||
184 | static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO | S_IWUSR, | |
185 | show_temp, store_temp, 0x06); | |
186 | static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, | |
187 | show_temp, store_temp, 0x05); | |
188 | static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO | S_IWUSR, | |
189 | show_temp, store_temp, 0x20); | |
190 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0x00); | |
191 | static SENSOR_DEVICE_ATTR_2(temp1_min_alarm, S_IRUGO, | |
192 | show_bit, NULL, 0x36, 0x01); | |
193 | static SENSOR_DEVICE_ATTR_2(temp1_max_alarm, S_IRUGO, | |
194 | show_bit, NULL, 0x35, 0x01); | |
195 | static SENSOR_DEVICE_ATTR_2(temp1_crit_alarm, S_IRUGO, | |
196 | show_bit, NULL, 0x37, 0x01); | |
197 | static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO | S_IWUSR, | |
198 | show_hyst, store_hyst, 0x20); | |
199 | ||
200 | static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO | S_IWUSR, | |
201 | show_temp, store_temp, 0x08); | |
202 | static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO | S_IWUSR, | |
203 | show_temp, store_temp, 0x07); | |
204 | static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO | S_IWUSR, | |
205 | show_temp, store_temp, 0x19); | |
206 | static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 0x01); | |
207 | static SENSOR_DEVICE_ATTR_2(temp2_min_alarm, S_IRUGO, | |
208 | show_bit, NULL, 0x36, 0x02); | |
209 | static SENSOR_DEVICE_ATTR_2(temp2_max_alarm, S_IRUGO, | |
210 | show_bit, NULL, 0x35, 0x02); | |
211 | static SENSOR_DEVICE_ATTR_2(temp2_crit_alarm, S_IRUGO, | |
212 | show_bit, NULL, 0x37, 0x02); | |
213 | static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO | S_IWUSR, | |
214 | show_hyst, store_hyst, 0x19); | |
215 | ||
216 | static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO | S_IWUSR, | |
217 | show_temp, store_temp, 0x16); | |
218 | static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO | S_IWUSR, | |
219 | show_temp, store_temp, 0x15); | |
220 | static SENSOR_DEVICE_ATTR(temp3_crit, S_IRUGO | S_IWUSR, | |
221 | show_temp, store_temp, 0x1A); | |
222 | static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 0x23); | |
223 | static SENSOR_DEVICE_ATTR_2(temp3_min_alarm, S_IRUGO, | |
224 | show_bit, NULL, 0x36, 0x04); | |
225 | static SENSOR_DEVICE_ATTR_2(temp3_max_alarm, S_IRUGO, | |
226 | show_bit, NULL, 0x35, 0x04); | |
227 | static SENSOR_DEVICE_ATTR_2(temp3_crit_alarm, S_IRUGO, | |
228 | show_bit, NULL, 0x37, 0x04); | |
229 | static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO | S_IWUSR, | |
230 | show_hyst, store_hyst, 0x1A); | |
231 | ||
960f12f4 AC |
232 | static SENSOR_DEVICE_ATTR_2(power_state, S_IRUGO | S_IWUSR, |
233 | show_bit, store_bit, 0x03, 0x40); | |
234 | ||
dac6831e KT |
235 | static struct attribute *mid_att_thermal[] = { |
236 | &sensor_dev_attr_temp1_min.dev_attr.attr, | |
237 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
238 | &sensor_dev_attr_temp1_crit.dev_attr.attr, | |
239 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
240 | &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, | |
241 | &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, | |
242 | &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, | |
243 | &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr, | |
244 | &sensor_dev_attr_temp2_min.dev_attr.attr, | |
245 | &sensor_dev_attr_temp2_max.dev_attr.attr, | |
246 | &sensor_dev_attr_temp2_crit.dev_attr.attr, | |
247 | &sensor_dev_attr_temp2_input.dev_attr.attr, | |
248 | &sensor_dev_attr_temp2_min_alarm.dev_attr.attr, | |
249 | &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, | |
250 | &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr, | |
251 | &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr, | |
252 | &sensor_dev_attr_temp3_min.dev_attr.attr, | |
253 | &sensor_dev_attr_temp3_max.dev_attr.attr, | |
254 | &sensor_dev_attr_temp3_crit.dev_attr.attr, | |
255 | &sensor_dev_attr_temp3_input.dev_attr.attr, | |
256 | &sensor_dev_attr_temp3_min_alarm.dev_attr.attr, | |
257 | &sensor_dev_attr_temp3_max_alarm.dev_attr.attr, | |
258 | &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr, | |
259 | &sensor_dev_attr_temp3_crit_hyst.dev_attr.attr, | |
960f12f4 | 260 | &sensor_dev_attr_power_state.dev_attr.attr, |
dac6831e KT |
261 | NULL |
262 | }; | |
263 | ||
264 | static const struct attribute_group m_thermal_gr = { | |
265 | .attrs = mid_att_thermal | |
266 | }; | |
267 | ||
268 | static int emc1403_detect(struct i2c_client *client, | |
269 | struct i2c_board_info *info) | |
270 | { | |
271 | int id; | |
7a1b76f2 | 272 | /* Check if thermal chip is SMSC and EMC1403 or EMC1423 */ |
dac6831e KT |
273 | |
274 | id = i2c_smbus_read_byte_data(client, THERMAL_SMSC_ID_REG); | |
275 | if (id != 0x5d) | |
276 | return -ENODEV; | |
277 | ||
7a1b76f2 JL |
278 | id = i2c_smbus_read_byte_data(client, THERMAL_PID_REG); |
279 | switch (id) { | |
280 | case 0x21: | |
281 | strlcpy(info->type, "emc1403", I2C_NAME_SIZE); | |
282 | break; | |
283 | case 0x23: | |
284 | strlcpy(info->type, "emc1423", I2C_NAME_SIZE); | |
285 | break; | |
dac6831e KT |
286 | /* Note: 0x25 is the 1404 which is very similar and this |
287 | driver could be extended */ | |
7a1b76f2 | 288 | default: |
dac6831e | 289 | return -ENODEV; |
7a1b76f2 | 290 | } |
dac6831e KT |
291 | |
292 | id = i2c_smbus_read_byte_data(client, THERMAL_REVISION_REG); | |
293 | if (id != 0x01) | |
294 | return -ENODEV; | |
295 | ||
dac6831e KT |
296 | return 0; |
297 | } | |
298 | ||
299 | static int emc1403_probe(struct i2c_client *client, | |
300 | const struct i2c_device_id *id) | |
301 | { | |
302 | int res; | |
303 | struct thermal_data *data; | |
304 | ||
305 | data = kzalloc(sizeof(struct thermal_data), GFP_KERNEL); | |
306 | if (data == NULL) { | |
307 | dev_warn(&client->dev, "out of memory"); | |
308 | return -ENOMEM; | |
309 | } | |
310 | ||
311 | i2c_set_clientdata(client, data); | |
312 | mutex_init(&data->mutex); | |
313 | data->hyst_valid = jiffies - 1; /* Expired */ | |
314 | ||
315 | res = sysfs_create_group(&client->dev.kobj, &m_thermal_gr); | |
316 | if (res) { | |
317 | dev_warn(&client->dev, "create group failed\n"); | |
dac6831e KT |
318 | goto thermal_error1; |
319 | } | |
320 | data->hwmon_dev = hwmon_device_register(&client->dev); | |
321 | if (IS_ERR(data->hwmon_dev)) { | |
322 | res = PTR_ERR(data->hwmon_dev); | |
323 | dev_warn(&client->dev, "register hwmon dev failed\n"); | |
324 | goto thermal_error2; | |
325 | } | |
326 | dev_info(&client->dev, "EMC1403 Thermal chip found\n"); | |
327 | return res; | |
328 | ||
329 | thermal_error2: | |
330 | sysfs_remove_group(&client->dev.kobj, &m_thermal_gr); | |
331 | thermal_error1: | |
332 | kfree(data); | |
333 | return res; | |
334 | } | |
335 | ||
336 | static int emc1403_remove(struct i2c_client *client) | |
337 | { | |
338 | struct thermal_data *data = i2c_get_clientdata(client); | |
339 | ||
340 | hwmon_device_unregister(data->hwmon_dev); | |
341 | sysfs_remove_group(&client->dev.kobj, &m_thermal_gr); | |
342 | kfree(data); | |
343 | return 0; | |
344 | } | |
345 | ||
346 | static const unsigned short emc1403_address_list[] = { | |
bcf721d1 | 347 | 0x18, 0x29, 0x4c, 0x4d, I2C_CLIENT_END |
dac6831e KT |
348 | }; |
349 | ||
350 | static const struct i2c_device_id emc1403_idtable[] = { | |
351 | { "emc1403", 0 }, | |
7a1b76f2 | 352 | { "emc1423", 0 }, |
dac6831e KT |
353 | { } |
354 | }; | |
355 | MODULE_DEVICE_TABLE(i2c, emc1403_idtable); | |
356 | ||
357 | static struct i2c_driver sensor_emc1403 = { | |
358 | .class = I2C_CLASS_HWMON, | |
359 | .driver = { | |
360 | .name = "emc1403", | |
361 | }, | |
362 | .detect = emc1403_detect, | |
363 | .probe = emc1403_probe, | |
364 | .remove = emc1403_remove, | |
365 | .id_table = emc1403_idtable, | |
366 | .address_list = emc1403_address_list, | |
367 | }; | |
368 | ||
369 | static int __init sensor_emc1403_init(void) | |
370 | { | |
371 | return i2c_add_driver(&sensor_emc1403); | |
372 | } | |
373 | ||
374 | static void __exit sensor_emc1403_exit(void) | |
375 | { | |
376 | i2c_del_driver(&sensor_emc1403); | |
377 | } | |
378 | ||
379 | module_init(sensor_emc1403_init); | |
380 | module_exit(sensor_emc1403_exit); | |
381 | ||
382 | MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com"); | |
383 | MODULE_DESCRIPTION("emc1403 Thermal Driver"); | |
384 | MODULE_LICENSE("GPL v2"); |