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4e233cbe AD |
1 | /* |
2 | * LM73 Sensor driver | |
3 | * Based on LM75 | |
4 | * | |
5 | * Copyright (C) 2007, CenoSYS (www.cenosys.com). | |
6 | * Copyright (C) 2009, Bollore telecom (www.bolloretelecom.eu). | |
7 | * | |
8 | * Guillaume Ligneul <guillaume.ligneul@gmail.com> | |
9 | * Adrien Demarez <adrien.demarez@bolloretelecom.eu> | |
10 | * Jeremy Laine <jeremy.laine@bolloretelecom.eu> | |
11 | * | |
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 | |
15 | */ | |
16 | ||
17 | #include <linux/module.h> | |
18 | #include <linux/init.h> | |
4e233cbe AD |
19 | #include <linux/i2c.h> |
20 | #include <linux/hwmon.h> | |
21 | #include <linux/hwmon-sysfs.h> | |
22 | #include <linux/err.h> | |
23 | ||
24 | ||
25 | /* Addresses scanned */ | |
26 | static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4c, | |
27 | 0x4d, 0x4e, I2C_CLIENT_END }; | |
28 | ||
4e233cbe AD |
29 | /* LM73 registers */ |
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 | |
36 | ||
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 | |
41 | ||
42 | /*-----------------------------------------------------------------------*/ | |
43 | ||
44 | ||
45 | static ssize_t set_temp(struct device *dev, struct device_attribute *da, | |
46 | const char *buf, size_t count) | |
47 | { | |
48 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
49 | struct i2c_client *client = to_i2c_client(dev); | |
50 | long temp; | |
51 | short value; | |
52 | ||
53 | int status = strict_strtol(buf, 10, &temp); | |
54 | if (status < 0) | |
55 | return status; | |
56 | ||
57 | /* Write value */ | |
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)); | |
61 | return count; | |
62 | } | |
63 | ||
64 | static ssize_t show_temp(struct device *dev, struct device_attribute *da, | |
65 | char *buf) | |
66 | { | |
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); | |
74 | } | |
75 | ||
76 | ||
77 | /*-----------------------------------------------------------------------*/ | |
78 | ||
79 | /* sysfs attributes for hwmon */ | |
80 | ||
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); | |
87 | ||
88 | ||
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, | |
93 | ||
94 | NULL | |
95 | }; | |
96 | ||
97 | static const struct attribute_group lm73_group = { | |
98 | .attrs = lm73_attributes, | |
99 | }; | |
100 | ||
101 | /*-----------------------------------------------------------------------*/ | |
102 | ||
103 | /* device probe and removal */ | |
104 | ||
105 | static int | |
106 | lm73_probe(struct i2c_client *client, const struct i2c_device_id *id) | |
107 | { | |
108 | struct device *hwmon_dev; | |
109 | int status; | |
110 | ||
111 | /* Register sysfs hooks */ | |
112 | status = sysfs_create_group(&client->dev.kobj, &lm73_group); | |
113 | if (status) | |
114 | return status; | |
115 | ||
116 | hwmon_dev = hwmon_device_register(&client->dev); | |
117 | if (IS_ERR(hwmon_dev)) { | |
118 | status = PTR_ERR(hwmon_dev); | |
119 | goto exit_remove; | |
120 | } | |
121 | i2c_set_clientdata(client, hwmon_dev); | |
122 | ||
123 | dev_info(&client->dev, "%s: sensor '%s'\n", | |
124 | dev_name(hwmon_dev), client->name); | |
125 | ||
126 | return 0; | |
127 | ||
128 | exit_remove: | |
129 | sysfs_remove_group(&client->dev.kobj, &lm73_group); | |
130 | return status; | |
131 | } | |
132 | ||
133 | static int lm73_remove(struct i2c_client *client) | |
134 | { | |
135 | struct device *hwmon_dev = i2c_get_clientdata(client); | |
136 | ||
137 | hwmon_device_unregister(hwmon_dev); | |
138 | sysfs_remove_group(&client->dev.kobj, &lm73_group); | |
4e233cbe AD |
139 | return 0; |
140 | } | |
141 | ||
142 | static const struct i2c_device_id lm73_ids[] = { | |
1f86df49 | 143 | { "lm73", 0 }, |
4e233cbe AD |
144 | { /* LIST END */ } |
145 | }; | |
146 | MODULE_DEVICE_TABLE(i2c, lm73_ids); | |
147 | ||
148 | /* Return 0 if detection is successful, -ENODEV otherwise */ | |
310ec792 | 149 | static int lm73_detect(struct i2c_client *new_client, |
4e233cbe AD |
150 | struct i2c_board_info *info) |
151 | { | |
152 | struct i2c_adapter *adapter = new_client->adapter; | |
153 | u16 id; | |
154 | u8 ctrl; | |
155 | ||
156 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | | |
157 | I2C_FUNC_SMBUS_WORD_DATA)) | |
158 | return -ENODEV; | |
159 | ||
160 | /* Check device ID */ | |
161 | id = i2c_smbus_read_word_data(new_client, LM73_REG_ID); | |
162 | ctrl = i2c_smbus_read_byte_data(new_client, LM73_REG_CTRL); | |
163 | if ((id != LM73_ID) || (ctrl & 0x10)) | |
164 | return -ENODEV; | |
165 | ||
166 | strlcpy(info->type, "lm73", I2C_NAME_SIZE); | |
167 | ||
168 | return 0; | |
169 | } | |
170 | ||
171 | static struct i2c_driver lm73_driver = { | |
172 | .class = I2C_CLASS_HWMON, | |
173 | .driver = { | |
174 | .name = "lm73", | |
175 | }, | |
176 | .probe = lm73_probe, | |
177 | .remove = lm73_remove, | |
178 | .id_table = lm73_ids, | |
179 | .detect = lm73_detect, | |
c3813d6a | 180 | .address_list = normal_i2c, |
4e233cbe AD |
181 | }; |
182 | ||
183 | /* module glue */ | |
184 | ||
185 | static int __init sensors_lm73_init(void) | |
186 | { | |
187 | return i2c_add_driver(&lm73_driver); | |
188 | } | |
189 | ||
190 | static void __exit sensors_lm73_exit(void) | |
191 | { | |
192 | i2c_del_driver(&lm73_driver); | |
193 | } | |
194 | ||
195 | MODULE_AUTHOR("Guillaume Ligneul <guillaume.ligneul@gmail.com>"); | |
196 | MODULE_DESCRIPTION("LM73 driver"); | |
197 | MODULE_LICENSE("GPL"); | |
198 | ||
199 | module_init(sensors_lm73_init); | |
200 | module_exit(sensors_lm73_exit); |