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authorSean MacLennan <seanm@seanm.ca>2008-08-06 16:41:05 -0400
committerJean Delvare <khali@mahadeva.delvare>2008-08-06 16:41:05 -0400
commit6c633c3025c75f5fcf3a76d375faff34e3be021b (patch)
tree0b9f8b6c8a14e74b5e9820a7b326a86df77939fd /drivers
parent84f768c1633cfc547d82b9dc671ffea2f3785542 (diff)
hwmon: ad7414 driver
Driver for the Analog Devices AD7414 temperature monitoring chip. Signed-off-by: Sean MacLennan <smaclennan@pikatech.com> Signed-off-by: Jean Delvare <khali@linux-fr.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/hwmon/Kconfig10
-rw-r--r--drivers/hwmon/Makefile1
-rw-r--r--drivers/hwmon/ad7414.c268
3 files changed, 279 insertions, 0 deletions
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 7fe392899908..bf4ebfb86fa5 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -57,6 +57,16 @@ config SENSORS_ABITUGURU3
57 This driver can also be built as a module. If so, the module 57 This driver can also be built as a module. If so, the module
58 will be called abituguru3. 58 will be called abituguru3.
59 59
60config SENSORS_AD7414
61 tristate "Analog Devices AD7414"
62 depends on I2C && EXPERIMENTAL
63 help
64 If you say yes here you get support for the Analog Devices
65 AD7414 temperature monitoring chip.
66
67 This driver can also be built as a module. If so, the module
68 will be called ad7414.
69
60config SENSORS_AD7418 70config SENSORS_AD7418
61 tristate "Analog Devices AD7416, AD7417 and AD7418" 71 tristate "Analog Devices AD7416, AD7417 and AD7418"
62 depends on I2C && EXPERIMENTAL 72 depends on I2C && EXPERIMENTAL
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index d098677e08de..7943e5cefb06 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -15,6 +15,7 @@ obj-$(CONFIG_SENSORS_W83791D) += w83791d.o
15 15
16obj-$(CONFIG_SENSORS_ABITUGURU) += abituguru.o 16obj-$(CONFIG_SENSORS_ABITUGURU) += abituguru.o
17obj-$(CONFIG_SENSORS_ABITUGURU3)+= abituguru3.o 17obj-$(CONFIG_SENSORS_ABITUGURU3)+= abituguru3.o
18obj-$(CONFIG_SENSORS_AD7414) += ad7414.o
18obj-$(CONFIG_SENSORS_AD7418) += ad7418.o 19obj-$(CONFIG_SENSORS_AD7418) += ad7418.o
19obj-$(CONFIG_SENSORS_ADM1021) += adm1021.o 20obj-$(CONFIG_SENSORS_ADM1021) += adm1021.o
20obj-$(CONFIG_SENSORS_ADM1025) += adm1025.o 21obj-$(CONFIG_SENSORS_ADM1025) += adm1025.o
diff --git a/drivers/hwmon/ad7414.c b/drivers/hwmon/ad7414.c
new file mode 100644
index 000000000000..ce8d94fbfd7e
--- /dev/null
+++ b/drivers/hwmon/ad7414.c
@@ -0,0 +1,268 @@
1/*
2 * An hwmon driver for the Analog Devices AD7414
3 *
4 * Copyright 2006 Stefan Roese <sr at denx.de>, DENX Software Engineering
5 *
6 * Copyright (c) 2008 PIKA Technologies
7 * Sean MacLennan <smaclennan@pikatech.com>
8 *
9 * Copyright (c) 2008 Spansion Inc.
10 * Frank Edelhaeuser <frank.edelhaeuser at spansion.com>
11 * (converted to "new style" I2C driver model, removed checkpatch.pl warnings)
12 *
13 * Based on ad7418.c
14 * Copyright 2006 Tower Technologies, Alessandro Zummo <a.zummo at towertech.it>
15 *
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2 of the License, or
19 * (at your option) any later version.
20 */
21
22#include <linux/module.h>
23#include <linux/jiffies.h>
24#include <linux/i2c.h>
25#include <linux/hwmon.h>
26#include <linux/hwmon-sysfs.h>
27#include <linux/err.h>
28#include <linux/mutex.h>
29#include <linux/sysfs.h>
30
31
32/* AD7414 registers */
33#define AD7414_REG_TEMP 0x00
34#define AD7414_REG_CONF 0x01
35#define AD7414_REG_T_HIGH 0x02
36#define AD7414_REG_T_LOW 0x03
37
38static u8 AD7414_REG_LIMIT[] = { AD7414_REG_T_HIGH, AD7414_REG_T_LOW };
39
40struct ad7414_data {
41 struct device *hwmon_dev;
42 struct mutex lock; /* atomic read data updates */
43 char valid; /* !=0 if following fields are valid */
44 unsigned long next_update; /* In jiffies */
45 s16 temp_input; /* Register values */
46 s8 temps[ARRAY_SIZE(AD7414_REG_LIMIT)];
47};
48
49/* REG: (0.25C/bit, two's complement) << 6 */
50static inline int ad7414_temp_from_reg(s16 reg)
51{
52 /* use integer division instead of equivalent right shift to
53 * guarantee arithmetic shift and preserve the sign
54 */
55 return ((int)reg / 64) * 250;
56}
57
58static inline int ad7414_read(struct i2c_client *client, u8 reg)
59{
60 if (reg == AD7414_REG_TEMP) {
61 int value = i2c_smbus_read_word_data(client, reg);
62 return (value < 0) ? value : swab16(value);
63 } else
64 return i2c_smbus_read_byte_data(client, reg);
65}
66
67static inline int ad7414_write(struct i2c_client *client, u8 reg, u8 value)
68{
69 return i2c_smbus_write_byte_data(client, reg, value);
70}
71
72struct ad7414_data *ad7414_update_device(struct device *dev)
73{
74 struct i2c_client *client = to_i2c_client(dev);
75 struct ad7414_data *data = i2c_get_clientdata(client);
76
77 mutex_lock(&data->lock);
78
79 if (time_after(jiffies, data->next_update) || !data->valid) {
80 int value, i;
81
82 dev_dbg(&client->dev, "starting ad7414 update\n");
83
84 value = ad7414_read(client, AD7414_REG_TEMP);
85 if (value < 0)
86 dev_dbg(&client->dev, "AD7414_REG_TEMP err %d\n",
87 value);
88 else
89 data->temp_input = value;
90
91 for (i = 0; i < ARRAY_SIZE(AD7414_REG_LIMIT); ++i) {
92 value = ad7414_read(client, AD7414_REG_LIMIT[i]);
93 if (value < 0)
94 dev_dbg(&client->dev, "AD7414 reg %d err %d\n",
95 AD7414_REG_LIMIT[i], value);
96 else
97 data->temps[i] = value;
98 }
99
100 data->next_update = jiffies + HZ + HZ / 2;
101 data->valid = 1;
102 }
103
104 mutex_unlock(&data->lock);
105
106 return data;
107}
108
109static ssize_t show_temp_input(struct device *dev,
110 struct device_attribute *attr, char *buf)
111{
112 struct ad7414_data *data = ad7414_update_device(dev);
113 return sprintf(buf, "%d\n", ad7414_temp_from_reg(data->temp_input));
114}
115static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input, NULL, 0);
116
117static ssize_t show_max_min(struct device *dev, struct device_attribute *attr,
118 char *buf)
119{
120 int index = to_sensor_dev_attr(attr)->index;
121 struct ad7414_data *data = ad7414_update_device(dev);
122 return sprintf(buf, "%d\n", data->temps[index] * 1000);
123}
124
125static ssize_t set_max_min(struct device *dev,
126 struct device_attribute *attr,
127 const char *buf, size_t count)
128{
129 struct i2c_client *client = to_i2c_client(dev);
130 struct ad7414_data *data = i2c_get_clientdata(client);
131 int index = to_sensor_dev_attr(attr)->index;
132 u8 reg = AD7414_REG_LIMIT[index];
133 long temp = simple_strtol(buf, NULL, 10);
134
135 temp = SENSORS_LIMIT(temp, -40000, 85000);
136 temp = (temp + (temp < 0 ? -500 : 500)) / 1000;
137
138 mutex_lock(&data->lock);
139 data->temps[index] = temp;
140 ad7414_write(client, reg, temp);
141 mutex_unlock(&data->lock);
142 return count;
143}
144
145static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
146 show_max_min, set_max_min, 0);
147static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO,
148 show_max_min, set_max_min, 1);
149
150static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
151 char *buf)
152{
153 int bitnr = to_sensor_dev_attr(attr)->index;
154 struct ad7414_data *data = ad7414_update_device(dev);
155 int value = (data->temp_input >> bitnr) & 1;
156 return sprintf(buf, "%d\n", value);
157}
158
159static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 3);
160static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 4);
161
162static struct attribute *ad7414_attributes[] = {
163 &sensor_dev_attr_temp1_input.dev_attr.attr,
164 &sensor_dev_attr_temp1_max.dev_attr.attr,
165 &sensor_dev_attr_temp1_min.dev_attr.attr,
166 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
167 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
168 NULL
169};
170
171static const struct attribute_group ad7414_group = {
172 .attrs = ad7414_attributes,
173};
174
175static int ad7414_probe(struct i2c_client *client,
176 const struct i2c_device_id *dev_id)
177{
178 struct ad7414_data *data;
179 int conf;
180 int err = 0;
181
182 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA |
183 I2C_FUNC_SMBUS_READ_WORD_DATA))
184 goto exit;
185
186 data = kzalloc(sizeof(struct ad7414_data), GFP_KERNEL);
187 if (!data) {
188 err = -ENOMEM;
189 goto exit;
190 }
191
192 i2c_set_clientdata(client, data);
193 mutex_init(&data->lock);
194
195 dev_info(&client->dev, "chip found\n");
196
197 /* Make sure the chip is powered up. */
198 conf = i2c_smbus_read_byte_data(client, AD7414_REG_CONF);
199 if (conf < 0)
200 dev_warn(&client->dev,
201 "ad7414_probe unable to read config register.\n");
202 else {
203 conf &= ~(1 << 7);
204 i2c_smbus_write_byte_data(client, AD7414_REG_CONF, conf);
205 }
206
207 /* Register sysfs hooks */
208 err = sysfs_create_group(&client->dev.kobj, &ad7414_group);
209 if (err)
210 goto exit_free;
211
212 data->hwmon_dev = hwmon_device_register(&client->dev);
213 if (IS_ERR(data->hwmon_dev)) {
214 err = PTR_ERR(data->hwmon_dev);
215 goto exit_remove;
216 }
217
218 return 0;
219
220exit_remove:
221 sysfs_remove_group(&client->dev.kobj, &ad7414_group);
222exit_free:
223 kfree(data);
224exit:
225 return err;
226}
227
228static int __devexit ad7414_remove(struct i2c_client *client)
229{
230 struct ad7414_data *data = i2c_get_clientdata(client);
231
232 hwmon_device_unregister(data->hwmon_dev);
233 sysfs_remove_group(&client->dev.kobj, &ad7414_group);
234 kfree(data);
235 return 0;
236}
237
238static const struct i2c_device_id ad7414_id[] = {
239 { "ad7414", 0 },
240 {}
241};
242
243static struct i2c_driver ad7414_driver = {
244 .driver = {
245 .name = "ad7414",
246 },
247 .probe = ad7414_probe,
248 .remove = __devexit_p(ad7414_remove),
249 .id_table = ad7414_id,
250};
251
252static int __init ad7414_init(void)
253{
254 return i2c_add_driver(&ad7414_driver);
255}
256module_init(ad7414_init);
257
258static void __exit ad7414_exit(void)
259{
260 i2c_del_driver(&ad7414_driver);
261}
262module_exit(ad7414_exit);
263
264MODULE_AUTHOR("Stefan Roese <sr at denx.de>, "
265 "Frank Edelhaeuser <frank.edelhaeuser at spansion.com>");
266
267MODULE_DESCRIPTION("AD7414 driver");
268MODULE_LICENSE("GPL");