* @last_update: time of last update (jiffies)
* @temperature: cached temperature measurement value
* @humidity: cached humidity measurement value
+ * @write_length: length for I2C measurement request
*/
struct hih6130 {
- struct device *hwmon_dev;
+ struct i2c_client *client;
struct mutex lock;
bool valid;
unsigned long last_update;
int temperature;
int humidity;
+ size_t write_length;
};
/**
*/
static inline int hih6130_temp_ticks_to_millicelsius(int ticks)
{
-
ticks = ticks >> 2;
/*
* from data sheet section 5.0
*/
static inline int hih6130_rh_ticks_to_per_cent_mille(int ticks)
{
-
ticks &= ~0xC000; /* clear status bits */
/*
* from data sheet section 4.0
/**
* hih6130_update_measurements() - get updated measurements from device
- * @client: I2C client device
+ * @dev: device
*
* Returns 0 on success, else negative errno.
*/
-static int hih6130_update_measurements(struct i2c_client *client)
+static int hih6130_update_measurements(struct device *dev)
{
+ struct hih6130 *hih6130 = dev_get_drvdata(dev);
+ struct i2c_client *client = hih6130->client;
int ret = 0;
int t;
- struct hih6130 *hih6130 = i2c_get_clientdata(client);
unsigned char tmp[4];
struct i2c_msg msgs[1] = {
{
*/
if (time_after(jiffies, hih6130->last_update + HZ) || !hih6130->valid) {
- /* write to slave address, no data, to request a measurement */
- ret = i2c_master_send(client, tmp, 0);
+ /*
+ * Write to slave address to request a measurement.
+ * According with the datasheet it should be with no data, but
+ * for systems with I2C bus drivers that do not allow zero
+ * length packets we write one dummy byte to allow sensor
+ * measurements on them.
+ */
+ tmp[0] = 0;
+ ret = i2c_master_send(client, tmp, hih6130->write_length);
if (ret < 0)
goto out;
struct device_attribute *attr,
char *buf)
{
- struct i2c_client *client = to_i2c_client(dev);
- struct hih6130 *hih6130 = i2c_get_clientdata(client);
- int ret = hih6130_update_measurements(client);
+ struct hih6130 *hih6130 = dev_get_drvdata(dev);
+ int ret;
+
+ ret = hih6130_update_measurements(dev);
if (ret < 0)
return ret;
return sprintf(buf, "%d\n", hih6130->temperature);
static ssize_t hih6130_show_humidity(struct device *dev,
struct device_attribute *attr, char *buf)
{
- struct i2c_client *client = to_i2c_client(dev);
- struct hih6130 *hih6130 = i2c_get_clientdata(client);
- int ret = hih6130_update_measurements(client);
+ struct hih6130 *hih6130 = dev_get_drvdata(dev);
+ int ret;
+
+ ret = hih6130_update_measurements(dev);
if (ret < 0)
return ret;
return sprintf(buf, "%d\n", hih6130->humidity);
static SENSOR_DEVICE_ATTR(humidity1_input, S_IRUGO, hih6130_show_humidity,
NULL, 0);
-static struct attribute *hih6130_attributes[] = {
+static struct attribute *hih6130_attrs[] = {
&sensor_dev_attr_temp1_input.dev_attr.attr,
&sensor_dev_attr_humidity1_input.dev_attr.attr,
NULL
};
-static const struct attribute_group hih6130_attr_group = {
- .attrs = hih6130_attributes,
-};
+ATTRIBUTE_GROUPS(hih6130);
-/**
- * hih6130_probe() - probe device
- * @client: I2C client device
- * @id: device ID
- *
- * Called by the I2C core when an entry in the ID table matches a
- * device's name.
- * Returns 0 on success.
- */
static int hih6130_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
+ struct device *dev = &client->dev;
struct hih6130 *hih6130;
- int err;
+ struct device *hwmon_dev;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
dev_err(&client->dev, "adapter does not support true I2C\n");
return -ENODEV;
}
- hih6130 = devm_kzalloc(&client->dev, sizeof(*hih6130), GFP_KERNEL);
+ hih6130 = devm_kzalloc(dev, sizeof(*hih6130), GFP_KERNEL);
if (!hih6130)
return -ENOMEM;
- i2c_set_clientdata(client, hih6130);
-
+ hih6130->client = client;
mutex_init(&hih6130->lock);
- err = sysfs_create_group(&client->dev.kobj, &hih6130_attr_group);
- if (err) {
- dev_dbg(&client->dev, "could not create sysfs files\n");
- return err;
- }
-
- hih6130->hwmon_dev = hwmon_device_register(&client->dev);
- if (IS_ERR(hih6130->hwmon_dev)) {
- dev_dbg(&client->dev, "unable to register hwmon device\n");
- err = PTR_ERR(hih6130->hwmon_dev);
- goto fail_remove_sysfs;
- }
-
- return 0;
-
-fail_remove_sysfs:
- sysfs_remove_group(&client->dev.kobj, &hih6130_attr_group);
- return err;
-}
-
-/**
- * hih6130_remove() - remove device
- * @client: I2C client device
- */
-static int hih6130_remove(struct i2c_client *client)
-{
- struct hih6130 *hih6130 = i2c_get_clientdata(client);
-
- hwmon_device_unregister(hih6130->hwmon_dev);
- sysfs_remove_group(&client->dev.kobj, &hih6130_attr_group);
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_QUICK))
+ hih6130->write_length = 1;
- return 0;
+ hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
+ hih6130,
+ hih6130_groups);
+ return PTR_ERR_OR_ZERO(hwmon_dev);
}
/* Device ID table */
static struct i2c_driver hih6130_driver = {
.driver.name = "hih6130",
.probe = hih6130_probe,
- .remove = hih6130_remove,
.id_table = hih6130_id,
};
projects / firefly-linux-kernel-4.4.55.git / blobdiff