forge/linux-uconsole
1
0
Fork 0
Code Issues 1 Pull requests Projects Releases Packages Wiki Activity Actions

staging:iio:hmc5843: Add pointer to i2c client to data struct

Browse source 
and use it to simplify code

Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Peter Meerwald 2013-09-19 20:35:00 +01:00 • committed by Jonathan Cameron
commit 8a5c191324
1 changed files with 25 additions and 36 deletions
Download patch file Download diff file Expand all files Collapse all files

61
drivers/staging/iio/magnetometer/hmc5843.c
View file

@ -182,6 +182,7 @@ struct hmc5843_chip_info {
/* Each client has this additional data */
struct hmc5843_data {
struct i2c_client *client;
struct mutex lock;
u8 rate;
u8 meas_conf;
@ -200,18 +201,15 @@ static s32 hmc5843_configure(struct i2c_client *client,
}
/* Return the measurement value from the specified channel */
static int hmc5843_read_measurement(struct iio_dev *indio_dev,
int address,
int *val)
static int hmc5843_read_measurement(struct hmc5843_data *data,
int address, int *val)
{
struct i2c_client *client = to_i2c_client(indio_dev->dev.parent);
struct hmc5843_data *data = iio_priv(indio_dev);
s32 result;
int tries = 150;
mutex_lock(&data->lock);
while (tries-- > 0) {
result = i2c_smbus_read_byte_data(client,
result = i2c_smbus_read_byte_data(data->client,
HMC5843_STATUS_REG);
if (result & HMC5843_DATA_READY)
break;
@ -219,12 +217,12 @@ static int hmc5843_read_measurement(struct iio_dev *indio_dev,
}
if (tries < 0) {
dev_err(&client->dev, "data not ready\n");
dev_err(&data->client->dev, "data not ready\n");
mutex_unlock(&data->lock);
return -EIO;
}
result = i2c_smbus_read_word_swapped(client, address);
result = i2c_smbus_read_word_swapped(data->client, address);
mutex_unlock(&data->lock);
if (result < 0)
return -EINVAL;
@ -318,15 +316,13 @@ static IIO_DEVICE_ATTR(operating_mode,
* and BN.
*
*/
static s32 hmc5843_set_meas_conf(struct i2c_client *client,
u8 meas_conf)
static s32 hmc5843_set_meas_conf(struct hmc5843_data *data, u8 meas_conf)
{
struct iio_dev *indio_dev = i2c_get_clientdata(client);
struct hmc5843_data *data = iio_priv(indio_dev);
u8 reg_val;
reg_val = (meas_conf & HMC5843_MEAS_CONF_MASK) |
(data->rate << HMC5843_RATE_OFFSET);
return i2c_smbus_write_byte_data(client, HMC5843_CONFIG_REG_A, reg_val);
return i2c_smbus_write_byte_data(data->client, HMC5843_CONFIG_REG_A,
reg_val);
}
static ssize_t hmc5843_show_measurement_configuration(struct device *dev,
@ -344,7 +340,6 @@ static ssize_t hmc5843_set_measurement_configuration(struct device *dev,
size_t count)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct i2c_client *client = to_i2c_client(indio_dev->dev.parent);
struct hmc5843_data *data = iio_priv(indio_dev);
unsigned long meas_conf = 0;
int error;
@ -357,7 +352,7 @@ static ssize_t hmc5843_set_measurement_configuration(struct device *dev,
mutex_lock(&data->lock);
dev_dbg(dev, "set measurement configuration to %lu\n", meas_conf);
if (hmc5843_set_meas_conf(client, meas_conf)) {
if (hmc5843_set_meas_conf(data, meas_conf)) {
count = -EINVAL;
goto exit;
}
@ -396,21 +391,19 @@ static ssize_t hmc5843_show_sampling_frequencies_available(struct device *dev,
static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(hmc5843_show_sampling_frequencies_available);
static s32 hmc5843_set_rate(struct i2c_client *client,
u8 rate)
static s32 hmc5843_set_rate(struct hmc5843_data *data, u8 rate)
{
struct iio_dev *indio_dev = i2c_get_clientdata(client);
struct hmc5843_data *data = iio_priv(indio_dev);
u8 reg_val;
if (rate >= HMC5843_RATE_NOT_USED) {
dev_err(&client->dev,
dev_err(&data->client->dev,
"data output rate is not supported\n");
return -EINVAL;
}
reg_val = data->meas_conf | (rate << HMC5843_RATE_OFFSET);
return i2c_smbus_write_byte_data(client, HMC5843_CONFIG_REG_A, reg_val);
return i2c_smbus_write_byte_data(data->client, HMC5843_CONFIG_REG_A,
reg_val);
}
static int hmc5843_check_sampling_frequency(struct hmc5843_data *data,
@ -433,20 +426,19 @@ static ssize_t hmc5843_set_sampling_frequency(struct device *dev,
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct i2c_client *client = to_i2c_client(indio_dev->dev.parent);
struct hmc5843_data *data = iio_priv(indio_dev);
int rate;
rate = hmc5843_check_sampling_frequency(data, buf);
if (rate < 0) {
dev_err(&client->dev,
dev_err(&data->client->dev,
"sampling frequency is not supported\n");
return rate;
}
mutex_lock(&data->lock);
dev_dbg(dev, "set rate to %d\n", rate);
if (hmc5843_set_rate(client, rate)) {
if (hmc5843_set_rate(data, rate)) {
count = -EINVAL;
goto exit;
}
@ -461,12 +453,11 @@ static ssize_t hmc5843_show_sampling_frequency(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct i2c_client *client = to_i2c_client(indio_dev->dev.parent);
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
struct hmc5843_data *data = iio_priv(indio_dev);
s32 rate;
rate = i2c_smbus_read_byte_data(client, this_attr->address);
rate = i2c_smbus_read_byte_data(data->client, this_attr->address);
if (rate < 0)
return rate;
rate = (rate & HMC5843_RATE_BITMASK) >> HMC5843_RATE_OFFSET;
@ -497,7 +488,6 @@ static ssize_t hmc5843_set_range_gain(struct device *dev,
size_t count)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct i2c_client *client = to_i2c_client(indio_dev->dev.parent);
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
struct hmc5843_data *data = iio_priv(indio_dev);
unsigned long range = 0;
@ -518,7 +508,7 @@ static ssize_t hmc5843_set_range_gain(struct device *dev,
data->range = range;
range = range << HMC5843_RANGE_GAIN_OFFSET;
if (i2c_smbus_write_byte_data(client, this_attr->address, range))
if (i2c_smbus_write_byte_data(data->client, this_attr->address, range))
count = -EINVAL;
exit:
@ -541,9 +531,7 @@ static int hmc5843_read_raw(struct iio_dev *indio_dev,
switch (mask) {
case IIO_CHAN_INFO_RAW:
return hmc5843_read_measurement(indio_dev,
chan->address,
val);
return hmc5843_read_measurement(data, chan->address, val);
case IIO_CHAN_INFO_SCALE:
*val = 0;
*val2 = data->variant->regval_to_nanoscale[data->range];
@ -621,8 +609,8 @@ static void hmc5843_init_client(struct i2c_client *client,
data->variant = &hmc5843_chip_info_tbl[id->driver_data];
indio_dev->channels = data->variant->channels;
indio_dev->num_channels = 3;
hmc5843_set_meas_conf(client, data->meas_conf);
hmc5843_set_rate(client, data->rate);
hmc5843_set_meas_conf(data, data->meas_conf);
hmc5843_set_rate(data, data->rate);
hmc5843_configure(client, data->operating_mode);
i2c_smbus_write_byte_data(client, HMC5843_CONFIG_REG_B, data->range);
mutex_init(&data->lock);
@ -649,6 +637,7 @@ static int hmc5843_probe(struct i2c_client *client,
/* default settings at probe */
data = iio_priv(indio_dev);
data->client = client;
data->meas_conf = HMC5843_MEAS_CONF_NORMAL;
data->range = HMC5843_RANGE_GAIN_DEFAULT;
data->operating_mode = HMC5843_MODE_CONVERSION_CONTINUOUS;
@ -687,10 +676,10 @@ static int hmc5843_suspend(struct device *dev)
static int hmc5843_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct hmc5843_data *data = iio_priv(i2c_get_clientdata(client));
struct hmc5843_data *data = iio_priv(i2c_get_clientdata(
to_i2c_client(dev)));
hmc5843_configure(client, data->operating_mode);
hmc5843_configure(data->client, data->operating_mode);
return 0;
}