5 * Copyright (C) 2007, CenoSYS (www.cenosys.com).
6 * Copyright (C) 2009, Bollore telecom (www.bolloretelecom.eu).
8 * Guillaume Ligneul <guillaume.ligneul@gmail.com>
9 * Adrien Demarez <adrien.demarez@bolloretelecom.eu>
10 * Jeremy Laine <jeremy.laine@bolloretelecom.eu>
12 * This software program is licensed subject to the GNU General Public License
13 * (GPL).Version 2,June 1991, available at
14 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
17 #include <linux/module.h>
18 #include <linux/init.h>
19 #include <linux/i2c.h>
20 #include <linux/hwmon.h>
21 #include <linux/hwmon-sysfs.h>
22 #include <linux/err.h>
25 /* Addresses scanned */
26 static const unsigned short normal_i2c
[] = { 0x48, 0x49, 0x4a, 0x4c,
27 0x4d, 0x4e, I2C_CLIENT_END
};
30 #define LM73_REG_INPUT 0x00
31 #define LM73_REG_CONF 0x01
32 #define LM73_REG_MAX 0x02
33 #define LM73_REG_MIN 0x03
34 #define LM73_REG_CTRL 0x04
35 #define LM73_REG_ID 0x07
37 #define LM73_ID 0x9001 /* or 0x190 after a swab16() */
38 #define DRVNAME "lm73"
39 #define LM73_TEMP_MIN (-40)
40 #define LM73_TEMP_MAX 150
42 /*-----------------------------------------------------------------------*/
45 static ssize_t
set_temp(struct device
*dev
, struct device_attribute
*da
,
46 const char *buf
, size_t count
)
48 struct sensor_device_attribute
*attr
= to_sensor_dev_attr(da
);
49 struct i2c_client
*client
= to_i2c_client(dev
);
53 int status
= strict_strtol(buf
, 10, &temp
);
58 value
= (short) SENSORS_LIMIT(temp
/250, (LM73_TEMP_MIN
*4),
59 (LM73_TEMP_MAX
*4)) << 5;
60 i2c_smbus_write_word_data(client
, attr
->index
, swab16(value
));
64 static ssize_t
show_temp(struct device
*dev
, struct device_attribute
*da
,
67 struct sensor_device_attribute
*attr
= to_sensor_dev_attr(da
);
68 struct i2c_client
*client
= to_i2c_client(dev
);
69 /* use integer division instead of equivalent right shift to
70 guarantee arithmetic shift and preserve the sign */
71 int temp
= ((s16
) (swab16(i2c_smbus_read_word_data(client
,
72 attr
->index
)))*250) / 32;
73 return sprintf(buf
, "%d\n", temp
);
77 /*-----------------------------------------------------------------------*/
79 /* sysfs attributes for hwmon */
81 static SENSOR_DEVICE_ATTR(temp1_max
, S_IWUSR
| S_IRUGO
,
82 show_temp
, set_temp
, LM73_REG_MAX
);
83 static SENSOR_DEVICE_ATTR(temp1_min
, S_IWUSR
| S_IRUGO
,
84 show_temp
, set_temp
, LM73_REG_MIN
);
85 static SENSOR_DEVICE_ATTR(temp1_input
, S_IRUGO
,
86 show_temp
, NULL
, LM73_REG_INPUT
);
89 static struct attribute
*lm73_attributes
[] = {
90 &sensor_dev_attr_temp1_input
.dev_attr
.attr
,
91 &sensor_dev_attr_temp1_max
.dev_attr
.attr
,
92 &sensor_dev_attr_temp1_min
.dev_attr
.attr
,
97 static const struct attribute_group lm73_group
= {
98 .attrs
= lm73_attributes
,
101 /*-----------------------------------------------------------------------*/
103 /* device probe and removal */
106 lm73_probe(struct i2c_client
*client
, const struct i2c_device_id
*id
)
108 struct device
*hwmon_dev
;
111 /* Register sysfs hooks */
112 status
= sysfs_create_group(&client
->dev
.kobj
, &lm73_group
);
116 hwmon_dev
= hwmon_device_register(&client
->dev
);
117 if (IS_ERR(hwmon_dev
)) {
118 status
= PTR_ERR(hwmon_dev
);
121 i2c_set_clientdata(client
, hwmon_dev
);
123 dev_info(&client
->dev
, "%s: sensor '%s'\n",
124 dev_name(hwmon_dev
), client
->name
);
129 sysfs_remove_group(&client
->dev
.kobj
, &lm73_group
);
133 static int lm73_remove(struct i2c_client
*client
)
135 struct device
*hwmon_dev
= i2c_get_clientdata(client
);
137 hwmon_device_unregister(hwmon_dev
);
138 sysfs_remove_group(&client
->dev
.kobj
, &lm73_group
);
139 i2c_set_clientdata(client
, NULL
);
143 static const struct i2c_device_id lm73_ids
[] = {
147 MODULE_DEVICE_TABLE(i2c
, lm73_ids
);
149 /* Return 0 if detection is successful, -ENODEV otherwise */
150 static int lm73_detect(struct i2c_client
*new_client
,
151 struct i2c_board_info
*info
)
153 struct i2c_adapter
*adapter
= new_client
->adapter
;
157 if (!i2c_check_functionality(adapter
, I2C_FUNC_SMBUS_BYTE_DATA
|
158 I2C_FUNC_SMBUS_WORD_DATA
))
161 /* Check device ID */
162 id
= i2c_smbus_read_word_data(new_client
, LM73_REG_ID
);
163 ctrl
= i2c_smbus_read_byte_data(new_client
, LM73_REG_CTRL
);
164 if ((id
!= LM73_ID
) || (ctrl
& 0x10))
167 strlcpy(info
->type
, "lm73", I2C_NAME_SIZE
);
172 static struct i2c_driver lm73_driver
= {
173 .class = I2C_CLASS_HWMON
,
178 .remove
= lm73_remove
,
179 .id_table
= lm73_ids
,
180 .detect
= lm73_detect
,
181 .address_list
= normal_i2c
,
186 static int __init
sensors_lm73_init(void)
188 return i2c_add_driver(&lm73_driver
);
191 static void __exit
sensors_lm73_exit(void)
193 i2c_del_driver(&lm73_driver
);
196 MODULE_AUTHOR("Guillaume Ligneul <guillaume.ligneul@gmail.com>");
197 MODULE_DESCRIPTION("LM73 driver");
198 MODULE_LICENSE("GPL");
200 module_init(sensors_lm73_init
);
201 module_exit(sensors_lm73_exit
);