diff options
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/hwmon/lm75.c | 35 |
1 files changed, 30 insertions, 5 deletions
diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c index 7e3ef134f1d2..84a55eacd903 100644 --- a/drivers/hwmon/lm75.c +++ b/drivers/hwmon/lm75.c | |||
@@ -27,6 +27,8 @@ | |||
27 | #include <linux/hwmon-sysfs.h> | 27 | #include <linux/hwmon-sysfs.h> |
28 | #include <linux/err.h> | 28 | #include <linux/err.h> |
29 | #include <linux/mutex.h> | 29 | #include <linux/mutex.h> |
30 | #include <linux/of.h> | ||
31 | #include <linux/thermal.h> | ||
30 | #include "lm75.h" | 32 | #include "lm75.h" |
31 | 33 | ||
32 | 34 | ||
@@ -71,6 +73,7 @@ static const u8 LM75_REG_TEMP[3] = { | |||
71 | /* Each client has this additional data */ | 73 | /* Each client has this additional data */ |
72 | struct lm75_data { | 74 | struct lm75_data { |
73 | struct device *hwmon_dev; | 75 | struct device *hwmon_dev; |
76 | struct thermal_zone_device *tz; | ||
74 | struct mutex update_lock; | 77 | struct mutex update_lock; |
75 | u8 orig_conf; | 78 | u8 orig_conf; |
76 | u8 resolution; /* In bits, between 9 and 12 */ | 79 | u8 resolution; /* In bits, between 9 and 12 */ |
@@ -91,22 +94,36 @@ static struct lm75_data *lm75_update_device(struct device *dev); | |||
91 | 94 | ||
92 | /*-----------------------------------------------------------------------*/ | 95 | /*-----------------------------------------------------------------------*/ |
93 | 96 | ||
97 | static inline long lm75_reg_to_mc(s16 temp, u8 resolution) | ||
98 | { | ||
99 | return ((temp >> (16 - resolution)) * 1000) >> (resolution - 8); | ||
100 | } | ||
101 | |||
94 | /* sysfs attributes for hwmon */ | 102 | /* sysfs attributes for hwmon */ |
95 | 103 | ||
104 | static int lm75_read_temp(void *dev, long *temp) | ||
105 | { | ||
106 | struct lm75_data *data = lm75_update_device(dev); | ||
107 | |||
108 | if (IS_ERR(data)) | ||
109 | return PTR_ERR(data); | ||
110 | |||
111 | *temp = lm75_reg_to_mc(data->temp[0], data->resolution); | ||
112 | |||
113 | return 0; | ||
114 | } | ||
115 | |||
96 | static ssize_t show_temp(struct device *dev, struct device_attribute *da, | 116 | static ssize_t show_temp(struct device *dev, struct device_attribute *da, |
97 | char *buf) | 117 | char *buf) |
98 | { | 118 | { |
99 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | 119 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
100 | struct lm75_data *data = lm75_update_device(dev); | 120 | struct lm75_data *data = lm75_update_device(dev); |
101 | long temp; | ||
102 | 121 | ||
103 | if (IS_ERR(data)) | 122 | if (IS_ERR(data)) |
104 | return PTR_ERR(data); | 123 | return PTR_ERR(data); |
105 | 124 | ||
106 | temp = ((data->temp[attr->index] >> (16 - data->resolution)) * 1000) | 125 | return sprintf(buf, "%ld\n", lm75_reg_to_mc(data->temp[attr->index], |
107 | >> (data->resolution - 8); | 126 | data->resolution)); |
108 | |||
109 | return sprintf(buf, "%ld\n", temp); | ||
110 | } | 127 | } |
111 | 128 | ||
112 | static ssize_t set_temp(struct device *dev, struct device_attribute *da, | 129 | static ssize_t set_temp(struct device *dev, struct device_attribute *da, |
@@ -273,6 +290,13 @@ lm75_probe(struct i2c_client *client, const struct i2c_device_id *id) | |||
273 | goto exit_remove; | 290 | goto exit_remove; |
274 | } | 291 | } |
275 | 292 | ||
293 | data->tz = thermal_zone_of_sensor_register(&client->dev, | ||
294 | 0, | ||
295 | &client->dev, | ||
296 | lm75_read_temp, NULL); | ||
297 | if (IS_ERR(data->tz)) | ||
298 | data->tz = NULL; | ||
299 | |||
276 | dev_info(&client->dev, "%s: sensor '%s'\n", | 300 | dev_info(&client->dev, "%s: sensor '%s'\n", |
277 | dev_name(data->hwmon_dev), client->name); | 301 | dev_name(data->hwmon_dev), client->name); |
278 | 302 | ||
@@ -287,6 +311,7 @@ static int lm75_remove(struct i2c_client *client) | |||
287 | { | 311 | { |
288 | struct lm75_data *data = i2c_get_clientdata(client); | 312 | struct lm75_data *data = i2c_get_clientdata(client); |
289 | 313 | ||
314 | thermal_zone_of_sensor_unregister(&client->dev, data->tz); | ||
290 | hwmon_device_unregister(data->hwmon_dev); | 315 | hwmon_device_unregister(data->hwmon_dev); |
291 | sysfs_remove_group(&client->dev.kobj, &lm75_group); | 316 | sysfs_remove_group(&client->dev.kobj, &lm75_group); |
292 | lm75_write_value(client, LM75_REG_CONF, data->orig_conf); | 317 | lm75_write_value(client, LM75_REG_CONF, data->orig_conf); |