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| author | Peter Meerwald <pmeerw@pmeerw.net> | 2013-10-16 22:19:00 (GMT) |
|---|---|---|
| committer | Jonathan Cameron <jic23@kernel.org> | 2013-10-17 22:52:16 (GMT) |
| commit | 9d5ad0c3e7b853544476f3fbe264515aae0f6106 (patch) | |
| tree | 2cbfa77f7a6067ea7b9f222b35c88c78bf131a86 | |
| parent | f3f755197b0436f212d11c5bb960e8ff3a784747 (diff) | |
| download | linux-fsl-qoriq-9d5ad0c3e7b853544476f3fbe264515aae0f6106.tar.xz | |
staging:iio:hmc5843: Check initialization and chip identifier
Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
| -rw-r--r-- | drivers/staging/iio/magnetometer/hmc5843.c | 33 |
1 files changed, 27 insertions, 6 deletions
diff --git a/drivers/staging/iio/magnetometer/hmc5843.c b/drivers/staging/iio/magnetometer/hmc5843.c index c819b8e..7e688dd 100644 --- a/drivers/staging/iio/magnetometer/hmc5843.c +++ b/drivers/staging/iio/magnetometer/hmc5843.c @@ -33,6 +33,7 @@ #define HMC5843_MODE_REG 0x02 #define HMC5843_DATA_OUT_MSB_REGS 0x03 #define HMC5843_STATUS_REG 0x09 +#define HMC5843_ID_REG 0x0a enum hmc5843_ids { HMC5843_ID, @@ -497,12 +498,30 @@ static const struct hmc5843_chip_info hmc5843_chip_info_tbl[] = { }, }; -static void hmc5843_init(struct hmc5843_data *data) +static int hmc5843_init(struct hmc5843_data *data) { - hmc5843_set_meas_conf(data, HMC5843_MEAS_CONF_NORMAL); - hmc5843_set_samp_freq(data, HMC5843_RATE_DEFAULT); - hmc5843_set_range_gain(data, HMC5843_RANGE_GAIN_DEFAULT); - hmc5843_set_mode(data, HMC5843_MODE_CONVERSION_CONTINUOUS); + int ret; + u8 id[3]; + + ret = i2c_smbus_read_i2c_block_data(data->client, HMC5843_ID_REG, + sizeof(id), id); + if (ret < 0) + return ret; + if (id[0] != 'H' || id[1] != '4' || id[2] != '3') { + dev_err(&data->client->dev, "no HMC5843/5883/5883L sensor\n"); + return -ENODEV; + } + + ret = hmc5843_set_meas_conf(data, HMC5843_MEAS_CONF_NORMAL); + if (ret < 0) + return ret; + ret = hmc5843_set_samp_freq(data, HMC5843_RATE_DEFAULT); + if (ret < 0) + return ret; + ret = hmc5843_set_range_gain(data, HMC5843_RANGE_GAIN_DEFAULT); + if (ret < 0) + return ret; + return hmc5843_set_mode(data, HMC5843_MODE_CONVERSION_CONTINUOUS); } static const struct iio_info hmc5843_info = { @@ -541,7 +560,9 @@ static int hmc5843_probe(struct i2c_client *client, indio_dev->num_channels = 4; indio_dev->available_scan_masks = hmc5843_scan_masks; - hmc5843_init(data); + ret = hmc5843_init(data); + if (ret < 0) + return ret; ret = iio_triggered_buffer_setup(indio_dev, NULL, hmc5843_trigger_handler, NULL); |