aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/hwmon/emc1403.c
blob: 76eeb6cb145ec570e42c86e0b32773dbafad2912 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
/*
 * emc1403.c - SMSC Thermal Driver
 *
 * Copyright (C) 2008 Intel Corp
 *
 *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 * TODO
 *	-	cache alarm and critical limit registers
 *	-	add emc1404 support
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/sysfs.h>
#include <linux/mutex.h>

#define THERMAL_PID_REG		0xfd
#define THERMAL_SMSC_ID_REG	0xfe
#define THERMAL_REVISION_REG	0xff

struct thermal_data {
	struct device *hwmon_dev;
	struct mutex mutex;
	/* Cache the hyst value so we don't keep re-reading it. In theory
	   we could cache it forever as nobody else should be writing it. */
	u8 cached_hyst;
	unsigned long hyst_valid;
};

static ssize_t show_temp(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
	int retval = i2c_smbus_read_byte_data(client, sda->index);

	if (retval < 0)
		return retval;
	return sprintf(buf, "%d000\n", retval);
}

static ssize_t show_bit(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr);
	int retval = i2c_smbus_read_byte_data(client, sda->nr);

	if (retval < 0)
		return retval;
	retval &= sda->index;
	return sprintf(buf, "%d\n", retval ? 1 : 0);
}

static ssize_t store_temp(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
	struct i2c_client *client = to_i2c_client(dev);
	unsigned long val;
	int retval;

	if (strict_strtoul(buf, 10, &val))
		return -EINVAL;
	retval = i2c_smbus_write_byte_data(client, sda->index,
					DIV_ROUND_CLOSEST(val, 1000));
	if (retval < 0)
		return retval;
	return count;
}

static ssize_t store_bit(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct thermal_data *data = i2c_get_clientdata(client);
	struct sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr);
	unsigned long val;
	int retval;

	if (strict_strtoul(buf, 10, &val))
		return -EINVAL;

	mutex_lock(&data->mutex);
	retval = i2c_smbus_read_byte_data(client, sda->nr);
	if (retval < 0)
		goto fail;

	retval &= ~sda->index;
	if (val)
		retval |= sda->index;

	retval = i2c_smbus_write_byte_data(client, sda->index, retval);
	if (retval == 0)
		retval = count;
fail:
	mutex_unlock(&data->mutex);
	return retval;
}

static ssize_t show_hyst(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct thermal_data *data = i2c_get_clientdata(client);
	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
	int retval;
	int hyst;

	retval = i2c_smbus_read_byte_data(client, sda->index);
	if (retval < 0)
		return retval;

	if (time_after(jiffies, data->hyst_valid)) {
		hyst = i2c_smbus_read_byte_data(client, 0x21);
		if (hyst < 0)
			return retval;
		data->cached_hyst = hyst;
		data->hyst_valid = jiffies + HZ;
	}
	return sprintf(buf, "%d000\n", retval - data->cached_hyst);
}

static ssize_t store_hyst(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct thermal_data *data = i2c_get_clientdata(client);
	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
	int retval;
	int hyst;
	unsigned long val;

	if (strict_strtoul(buf, 10, &val))
		return -EINVAL;

	mutex_lock(&data->mutex);
	retval = i2c_smbus_read_byte_data(client, sda->index);
	if (retval < 0)
		goto fail;

	hyst = val - retval * 1000;
	hyst = DIV_ROUND_CLOSEST(hyst, 1000);
	if (hyst < 0 || hyst > 255) {
		retval = -ERANGE;
		goto fail;
	}

	retval = i2c_smbus_write_byte_data(client, 0x21, hyst);
	if (retval == 0) {
		retval = count;
		data->cached_hyst = hyst;
		data->hyst_valid = jiffies + HZ;
	}
fail:
	mutex_unlock(&data->mutex);
	return retval;
}

/*
 *	Sensors. We pass the actual i2c register to the methods.
 */

static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO | S_IWUSR,
	show_temp, store_temp, 0x06);
static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR,
	show_temp, store_temp, 0x05);
static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO | S_IWUSR,
	show_temp, store_temp, 0x20);
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0x00);
static SENSOR_DEVICE_ATTR_2(temp1_min_alarm, S_IRUGO,
	show_bit, NULL, 0x36, 0x01);
static SENSOR_DEVICE_ATTR_2(temp1_max_alarm, S_IRUGO,
	show_bit, NULL, 0x35, 0x01);
static SENSOR_DEVICE_ATTR_2(temp1_crit_alarm, S_IRUGO,
	show_bit, NULL, 0x37, 0x01);
static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO | S_IWUSR,
	show_hyst, store_hyst, 0x20);

static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO | S_IWUSR,
	show_temp, store_temp, 0x08);
static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO | S_IWUSR,
	show_temp, store_temp, 0x07);
static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO | S_IWUSR,
	show_temp, store_temp, 0x19);
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 0x01);
static SENSOR_DEVICE_ATTR_2(temp2_min_alarm, S_IRUGO,
	show_bit, NULL, 0x36, 0x02);
static SENSOR_DEVICE_ATTR_2(temp2_max_alarm, S_IRUGO,
	show_bit, NULL, 0x35, 0x02);
static SENSOR_DEVICE_ATTR_2(temp2_crit_alarm, S_IRUGO,
	show_bit, NULL, 0x37, 0x02);
static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO | S_IWUSR,
	show_hyst, store_hyst, 0x19);

static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO | S_IWUSR,
	show_temp, store_temp, 0x16);
static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO | S_IWUSR,
	show_temp, store_temp, 0x15);
static SENSOR_DEVICE_ATTR(temp3_crit, S_IRUGO | S_IWUSR,
	show_temp, store_temp, 0x1A);
static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 0x23);
static SENSOR_DEVICE_ATTR_2(temp3_min_alarm, S_IRUGO,
	show_bit, NULL, 0x36, 0x04);
static SENSOR_DEVICE_ATTR_2(temp3_max_alarm, S_IRUGO,
	show_bit, NULL, 0x35, 0x04);
static SENSOR_DEVICE_ATTR_2(temp3_crit_alarm, S_IRUGO,
	show_bit, NULL, 0x37, 0x04);
static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO | S_IWUSR,
	show_hyst, store_hyst, 0x1A);

static SENSOR_DEVICE_ATTR_2(power_state, S_IRUGO | S_IWUSR,
	show_bit, store_bit, 0x03, 0x40);

static struct attribute *mid_att_thermal[] = {
	&sensor_dev_attr_temp1_min.dev_attr.attr,
	&sensor_dev_attr_temp1_max.dev_attr.attr,
	&sensor_dev_attr_temp1_crit.dev_attr.attr,
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
	&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
	&sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
	&sensor_dev_attr_temp2_min.dev_attr.attr,
	&sensor_dev_attr_temp2_max.dev_attr.attr,
	&sensor_dev_attr_temp2_crit.dev_attr.attr,
	&sensor_dev_attr_temp2_input.dev_attr.attr,
	&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
	&sensor_dev_attr_temp3_min.dev_attr.attr,
	&sensor_dev_attr_temp3_max.dev_attr.attr,
	&sensor_dev_attr_temp3_crit.dev_attr.attr,
	&sensor_dev_attr_temp3_input.dev_attr.attr,
	&sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
	&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
	&sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
	&sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
	&sensor_dev_attr_power_state.dev_attr.attr,
	NULL
};

static const struct attribute_group m_thermal_gr = {
	.attrs = mid_att_thermal
};

static int emc1403_detect(struct i2c_client *client,
			struct i2c_board_info *info)
{
	int id;
	/* Check if thermal chip is SMSC and EMC1403 or EMC1423 */

	id = i2c_smbus_read_byte_data(client, THERMAL_SMSC_ID_REG);
	if (id != 0x5d)
		return -ENODEV;

	id = i2c_smbus_read_byte_data(client, THERMAL_PID_REG);
	switch (id) {
		case 0x21:
			strlcpy(info->type, "emc1403", I2C_NAME_SIZE);
			break;
		case 0x23:
			strlcpy(info->type, "emc1423", I2C_NAME_SIZE);
			break;
		/* Note: 0x25 is the 1404 which is very similar and this
		   driver could be extended */
		default:
			return -ENODEV;
	}
	id = i2c_smbus_read_byte_data(client, THERMAL_REVISION_REG);
	if (id != 0x01)
		return -ENODEV;
	return 0;
}

static int emc1403_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	int res;
	struct thermal_data *data;

	data = kzalloc(sizeof(struct thermal_data), GFP_KERNEL);
	if (data == NULL) {
		dev_warn(&client->dev, "out of memory");
		return -ENOMEM;
	}

	i2c_set_clientdata(client, data);
	mutex_init(&data->mutex);
	data->hyst_valid = jiffies - 1;		/* Expired */

	res = sysfs_create_group(&client->dev.kobj, &m_thermal_gr);
	if (res) {
		dev_warn(&client->dev, "create group failed\n");
		goto thermal_error1;
	}
	data->hwmon_dev = hwmon_device_register(&client->dev);
	if (IS_ERR(data->hwmon_dev)) {
		res = PTR_ERR(data->hwmon_dev);
		dev_warn(&client->dev, "register hwmon dev failed\n");
		goto thermal_error2;
	}
	dev_info(&client->dev, "EMC1403 Thermal chip found\n");
	return res;

thermal_error2:
	sysfs_remove_group(&client->dev.kobj, &m_thermal_gr);
thermal_error1:
	kfree(data);
	return res;
}

static int emc1403_remove(struct i2c_client *client)
{
	struct thermal_data *data = i2c_get_clientdata(client);

	hwmon_device_unregister(data->hwmon_dev);
	sysfs_remove_group(&client->dev.kobj, &m_thermal_gr);
	kfree(data);
	return 0;
}

static const unsigned short emc1403_address_list[] = {
	0x18, 0x2a, 0x4c, 0x4d, I2C_CLIENT_END
};

static const struct i2c_device_id emc1403_idtable[] = {
	{ "emc1403", 0 },
	{ "emc1423", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, emc1403_idtable);

static struct i2c_driver sensor_emc1403 = {
	.class = I2C_CLASS_HWMON,
	.driver = {
		.name = "emc1403",
	},
	.detect = emc1403_detect,
	.probe = emc1403_probe,
	.remove = emc1403_remove,
	.id_table = emc1403_idtable,
	.address_list = emc1403_address_list,
};

static int __init sensor_emc1403_init(void)
{
	return i2c_add_driver(&sensor_emc1403);
}

static void  __exit sensor_emc1403_exit(void)
{
	i2c_del_driver(&sensor_emc1403);
}

module_init(sensor_emc1403_init);
module_exit(sensor_emc1403_exit);

MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com");
MODULE_DESCRIPTION("emc1403 Thermal Driver");
MODULE_LICENSE("GPL v2");