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Diffstat (limited to 'drivers/hwmon/emc1403.c')
-rw-r--r--drivers/hwmon/emc1403.c344
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
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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
41struct 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
50static 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
62static 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
75static 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
92static 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
115static 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 }
146fail:
147 mutex_unlock(&data->mutex);
148 return retval;
149}
150
151/*
152 * Sensors. We pass the actual i2c register to the methods.
153 */
154
155static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO | S_IWUSR,
156 show_temp, store_temp, 0x06);
157static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR,
158 show_temp, store_temp, 0x05);
159static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO | S_IWUSR,
160 show_temp, store_temp, 0x20);
161static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0x00);
162static SENSOR_DEVICE_ATTR_2(temp1_min_alarm, S_IRUGO,
163 show_bit, NULL, 0x36, 0x01);
164static SENSOR_DEVICE_ATTR_2(temp1_max_alarm, S_IRUGO,
165 show_bit, NULL, 0x35, 0x01);
166static SENSOR_DEVICE_ATTR_2(temp1_crit_alarm, S_IRUGO,
167 show_bit, NULL, 0x37, 0x01);
168static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO | S_IWUSR,
169 show_hyst, store_hyst, 0x20);
170
171static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO | S_IWUSR,
172 show_temp, store_temp, 0x08);
173static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO | S_IWUSR,
174 show_temp, store_temp, 0x07);
175static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO | S_IWUSR,
176 show_temp, store_temp, 0x19);
177static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 0x01);
178static SENSOR_DEVICE_ATTR_2(temp2_min_alarm, S_IRUGO,
179 show_bit, NULL, 0x36, 0x02);
180static SENSOR_DEVICE_ATTR_2(temp2_max_alarm, S_IRUGO,
181 show_bit, NULL, 0x35, 0x02);
182static SENSOR_DEVICE_ATTR_2(temp2_crit_alarm, S_IRUGO,
183 show_bit, NULL, 0x37, 0x02);
184static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO | S_IWUSR,
185 show_hyst, store_hyst, 0x19);
186
187static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO | S_IWUSR,
188 show_temp, store_temp, 0x16);
189static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO | S_IWUSR,
190 show_temp, store_temp, 0x15);
191static SENSOR_DEVICE_ATTR(temp3_crit, S_IRUGO | S_IWUSR,
192 show_temp, store_temp, 0x1A);
193static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 0x23);
194static SENSOR_DEVICE_ATTR_2(temp3_min_alarm, S_IRUGO,
195 show_bit, NULL, 0x36, 0x04);
196static SENSOR_DEVICE_ATTR_2(temp3_max_alarm, S_IRUGO,
197 show_bit, NULL, 0x35, 0x04);
198static SENSOR_DEVICE_ATTR_2(temp3_crit_alarm, S_IRUGO,
199 show_bit, NULL, 0x37, 0x04);
200static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO | S_IWUSR,
201 show_hyst, store_hyst, 0x1A);
202
203static 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
231static const struct attribute_group m_thermal_gr = {
232 .attrs = mid_att_thermal
233};
234
235static 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
259static 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
290thermal_error2:
291 sysfs_remove_group(&client->dev.kobj, &m_thermal_gr);
292thermal_error1:
293 kfree(data);
294 return res;
295}
296
297static 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
307static const unsigned short emc1403_address_list[] = {
308 0x18, 0x2a, 0x4c, 0x4d, I2C_CLIENT_END
309};
310
311static const struct i2c_device_id emc1403_idtable[] = {
312 { "emc1403", 0 },
313 { }
314};
315MODULE_DEVICE_TABLE(i2c, emc1403_idtable);
316
317static 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
329static int __init sensor_emc1403_init(void)
330{
331 return i2c_add_driver(&sensor_emc1403);
332}
333
334static void __exit sensor_emc1403_exit(void)
335{
336 i2c_del_driver(&sensor_emc1403);
337}
338
339module_init(sensor_emc1403_init);
340module_exit(sensor_emc1403_exit);
341
342MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com");
343MODULE_DESCRIPTION("emc1403 Thermal Driver");
344MODULE_LICENSE("GPL v2");