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staging: iio: rework sampling rate setting in hmc5843 

Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Meerwald 2012-05-17 02:28:08 +02:00 committed by Greg Kroah-Hartman
parent 64255031bd
commit 13f6eb69b1
1 changed files with 23 additions and 26 deletions
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49
drivers/staging/iio/magnetometer/hmc5843.c
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@ -85,14 +85,6 @@
*/
#define HMC5843_RATE_OFFSET 0x02
#define HMC5843_RATE_BITMASK 0x1C
#define RATE_5 0x00
#define RATE_10 0x01
#define RATE_20 0x02
#define RATE_50 0x03
#define RATE_100 0x04
#define RATE_200 0x05
#define RATE_500 0x06
#define HMC5843_RATE_NOT_USED 0x07
/*
@ -342,6 +334,21 @@ static s32 hmc5843_set_rate(struct i2c_client *client,
return i2c_smbus_write_byte_data(client, HMC5843_CONFIG_REG_A, reg_val);
}
static int hmc5843_check_sampling_frequency(struct hmc5843_data *data,
const char *buf)
{
const char * const *samp_freq = regval_to_samp_freq;
int i;
for (i = 0; i < HMC5843_RATE_NOT_USED; i++) {
if (strncmp(buf, samp_freq[i],
strlen(samp_freq[i])) == 0)
return i;
}
return -EINVAL;
}
static ssize_t set_sampling_frequency(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
@ -350,27 +357,17 @@ static ssize_t 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);
unsigned long rate = 0;
int rate;
if (strncmp(buf, "0.5" , 3) == 0)
rate = RATE_5;
else if (strncmp(buf, "1" , 1) == 0)
rate = RATE_10;
else if (strncmp(buf, "2", 1) == 0)
rate = RATE_20;
else if (strncmp(buf, "5", 1) == 0)
rate = RATE_50;
else if (strncmp(buf, "10", 2) == 0)
rate = RATE_100;
else if (strncmp(buf, "20" , 2) == 0)
rate = RATE_200;
else if (strncmp(buf, "50" , 2) == 0)
rate = RATE_500;
else
return -EINVAL;
rate = hmc5843_check_sampling_frequency(data, buf);
if (rate < 0) {
dev_err(&client->dev,
"sampling frequency is not supported\n");
return rate;
}
mutex_lock(&data->lock);
dev_dbg(dev, "set rate to %lu\n", rate);
dev_dbg(dev, "set rate to %d\n", rate);
if (hmc5843_set_rate(client, rate)) {
count = -EINVAL;
goto exit;