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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 | ||
90f4102c | 37 | #define LM73_ID 0x9001 /* 0x0190, byte-swapped */ |
4e233cbe | 38 | #define DRVNAME "lm73" |
91bba688 GR |
39 | #define LM73_TEMP_MIN (-256000 / 250) |
40 | #define LM73_TEMP_MAX (255750 / 250) | |
4e233cbe AD |
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; | |
0602934f | 52 | s32 err; |
4e233cbe | 53 | |
179c4fdb | 54 | int status = kstrtol(buf, 10, &temp); |
4e233cbe AD |
55 | if (status < 0) |
56 | return status; | |
57 | ||
58 | /* Write value */ | |
91bba688 | 59 | value = clamp_val(temp / 250, LM73_TEMP_MIN, LM73_TEMP_MAX) << 5; |
0602934f CV |
60 | err = i2c_smbus_write_word_swapped(client, attr->index, value); |
61 | return (err < 0) ? err : count; | |
4e233cbe AD |
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); | |
0602934f CV |
69 | int temp; |
70 | ||
71 | s32 err = i2c_smbus_read_word_swapped(client, attr->index); | |
72 | if (err < 0) | |
73 | return err; | |
74 | ||
4e233cbe AD |
75 | /* use integer division instead of equivalent right shift to |
76 | guarantee arithmetic shift and preserve the sign */ | |
0602934f CV |
77 | temp = (((s16) err) * 250) / 32; |
78 | return scnprintf(buf, PAGE_SIZE, "%d\n", temp); | |
4e233cbe AD |
79 | } |
80 | ||
81 | ||
82 | /*-----------------------------------------------------------------------*/ | |
83 | ||
84 | /* sysfs attributes for hwmon */ | |
85 | ||
86 | static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, | |
87 | show_temp, set_temp, LM73_REG_MAX); | |
88 | static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, | |
89 | show_temp, set_temp, LM73_REG_MIN); | |
90 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, | |
91 | show_temp, NULL, LM73_REG_INPUT); | |
92 | ||
93 | ||
94 | static struct attribute *lm73_attributes[] = { | |
95 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
96 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
97 | &sensor_dev_attr_temp1_min.dev_attr.attr, | |
98 | ||
99 | NULL | |
100 | }; | |
101 | ||
102 | static const struct attribute_group lm73_group = { | |
103 | .attrs = lm73_attributes, | |
104 | }; | |
105 | ||
106 | /*-----------------------------------------------------------------------*/ | |
107 | ||
108 | /* device probe and removal */ | |
109 | ||
110 | static int | |
111 | lm73_probe(struct i2c_client *client, const struct i2c_device_id *id) | |
112 | { | |
113 | struct device *hwmon_dev; | |
114 | int status; | |
115 | ||
116 | /* Register sysfs hooks */ | |
117 | status = sysfs_create_group(&client->dev.kobj, &lm73_group); | |
118 | if (status) | |
119 | return status; | |
120 | ||
121 | hwmon_dev = hwmon_device_register(&client->dev); | |
122 | if (IS_ERR(hwmon_dev)) { | |
123 | status = PTR_ERR(hwmon_dev); | |
124 | goto exit_remove; | |
125 | } | |
126 | i2c_set_clientdata(client, hwmon_dev); | |
127 | ||
128 | dev_info(&client->dev, "%s: sensor '%s'\n", | |
129 | dev_name(hwmon_dev), client->name); | |
130 | ||
131 | return 0; | |
132 | ||
133 | exit_remove: | |
134 | sysfs_remove_group(&client->dev.kobj, &lm73_group); | |
135 | return status; | |
136 | } | |
137 | ||
138 | static int lm73_remove(struct i2c_client *client) | |
139 | { | |
140 | struct device *hwmon_dev = i2c_get_clientdata(client); | |
141 | ||
142 | hwmon_device_unregister(hwmon_dev); | |
143 | sysfs_remove_group(&client->dev.kobj, &lm73_group); | |
4e233cbe AD |
144 | return 0; |
145 | } | |
146 | ||
147 | static const struct i2c_device_id lm73_ids[] = { | |
1f86df49 | 148 | { "lm73", 0 }, |
4e233cbe AD |
149 | { /* LIST END */ } |
150 | }; | |
151 | MODULE_DEVICE_TABLE(i2c, lm73_ids); | |
152 | ||
153 | /* Return 0 if detection is successful, -ENODEV otherwise */ | |
310ec792 | 154 | static int lm73_detect(struct i2c_client *new_client, |
4e233cbe AD |
155 | struct i2c_board_info *info) |
156 | { | |
157 | struct i2c_adapter *adapter = new_client->adapter; | |
24d6e2a8 | 158 | int id, ctrl, conf; |
4e233cbe AD |
159 | |
160 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | | |
161 | I2C_FUNC_SMBUS_WORD_DATA)) | |
162 | return -ENODEV; | |
163 | ||
24d6e2a8 JD |
164 | /* |
165 | * Do as much detection as possible with byte reads first, as word | |
166 | * reads can confuse other devices. | |
167 | */ | |
168 | ctrl = i2c_smbus_read_byte_data(new_client, LM73_REG_CTRL); | |
169 | if (ctrl < 0 || (ctrl & 0x10)) | |
170 | return -ENODEV; | |
171 | ||
172 | conf = i2c_smbus_read_byte_data(new_client, LM73_REG_CONF); | |
173 | if (conf < 0 || (conf & 0x0c)) | |
174 | return -ENODEV; | |
175 | ||
176 | id = i2c_smbus_read_byte_data(new_client, LM73_REG_ID); | |
177 | if (id < 0 || id != (LM73_ID & 0xff)) | |
178 | return -ENODEV; | |
179 | ||
4e233cbe AD |
180 | /* Check device ID */ |
181 | id = i2c_smbus_read_word_data(new_client, LM73_REG_ID); | |
24d6e2a8 | 182 | if (id < 0 || id != LM73_ID) |
4e233cbe AD |
183 | return -ENODEV; |
184 | ||
185 | strlcpy(info->type, "lm73", I2C_NAME_SIZE); | |
186 | ||
187 | return 0; | |
188 | } | |
189 | ||
190 | static struct i2c_driver lm73_driver = { | |
191 | .class = I2C_CLASS_HWMON, | |
192 | .driver = { | |
193 | .name = "lm73", | |
194 | }, | |
195 | .probe = lm73_probe, | |
196 | .remove = lm73_remove, | |
197 | .id_table = lm73_ids, | |
198 | .detect = lm73_detect, | |
c3813d6a | 199 | .address_list = normal_i2c, |
4e233cbe AD |
200 | }; |
201 | ||
f0967eea | 202 | module_i2c_driver(lm73_driver); |
4e233cbe AD |
203 | |
204 | MODULE_AUTHOR("Guillaume Ligneul <guillaume.ligneul@gmail.com>"); | |
205 | MODULE_DESCRIPTION("LM73 driver"); | |
206 | MODULE_LICENSE("GPL"); |