#define ADIS16080_DIN_WRITE (1 << 15)
+struct adis16080_chip_info {
+ int scale_val;
+ int scale_val2;
+};
+
/**
* struct adis16080_state - device instance specific data
* @us: actual spi_device to write data
+ * @info: chip specific parameters
* @buf: transmit or receive buffer
- * @buf_lock: mutex to protect tx and rx
**/
struct adis16080_state {
struct spi_device *us;
- struct mutex buf_lock;
+ const struct adis16080_chip_info *info;
- u8 buf[2] ____cacheline_aligned;
+ __be16 buf ____cacheline_aligned;
};
-static int adis16080_spi_write(struct iio_dev *indio_dev,
- u16 val)
+static int adis16080_read_sample(struct iio_dev *indio_dev,
+ u16 addr, int *val)
{
- int ret;
struct adis16080_state *st = iio_priv(indio_dev);
-
- mutex_lock(&st->buf_lock);
- st->buf[0] = val >> 8;
- st->buf[1] = val;
-
- ret = spi_write(st->us, st->buf, 2);
- mutex_unlock(&st->buf_lock);
-
- return ret;
-}
-
-static int adis16080_spi_read(struct iio_dev *indio_dev,
- u16 *val)
-{
+ struct spi_message m;
int ret;
- struct adis16080_state *st = iio_priv(indio_dev);
+ struct spi_transfer t[] = {
+ {
+ .tx_buf = &st->buf,
+ .len = 2,
+ .cs_change = 1,
+ }, {
+ .rx_buf = &st->buf,
+ .len = 2,
+ },
+ };
- mutex_lock(&st->buf_lock);
+ st->buf = cpu_to_be16(addr | ADIS16080_DIN_WRITE);
- ret = spi_read(st->us, st->buf, 2);
+ spi_message_init(&m);
+ spi_message_add_tail(&t[0], &m);
+ spi_message_add_tail(&t[1], &m);
+ ret = spi_sync(st->us, &m);
if (ret == 0)
- *val = sign_extend32(((st->buf[0] & 0xF) << 8) | st->buf[1], 11);
- mutex_unlock(&st->buf_lock);
+ *val = sign_extend32(be16_to_cpu(st->buf), 11);
return ret;
}
int *val2,
long mask)
{
- int ret = -EINVAL;
- u16 ut = 0;
- /* Take the iio_dev status lock */
+ struct adis16080_state *st = iio_priv(indio_dev);
+ int ret;
- mutex_lock(&indio_dev->mlock);
switch (mask) {
case IIO_CHAN_INFO_RAW:
- ret = adis16080_spi_write(indio_dev,
- chan->address |
- ADIS16080_DIN_WRITE);
- if (ret < 0)
- break;
- ret = adis16080_spi_read(indio_dev, &ut);
- if (ret < 0)
- break;
- *val = ut;
- ret = IIO_VAL_INT;
+ mutex_lock(&indio_dev->mlock);
+ ret = adis16080_read_sample(indio_dev, chan->address, val);
+ mutex_unlock(&indio_dev->mlock);
+ return ret ? ret : IIO_VAL_INT;
+ case IIO_CHAN_INFO_SCALE:
+ switch (chan->type) {
+ case IIO_ANGL_VEL:
+ *val = st->info->scale_val;
+ *val2 = st->info->scale_val2;
+ return IIO_VAL_FRACTIONAL;
+ case IIO_VOLTAGE:
+ /* VREF = 5V, 12 bits */
+ *val = 5000;
+ *val2 = 12;
+ return IIO_VAL_FRACTIONAL_LOG2;
+ case IIO_TEMP:
+ /* 85 C = 585, 25 C = 0 */
+ *val = 85000 - 25000;
+ *val2 = 585;
+ return IIO_VAL_FRACTIONAL;
+ default:
+ return -EINVAL;
+ }
+ case IIO_CHAN_INFO_OFFSET:
+ switch (chan->type) {
+ case IIO_VOLTAGE:
+ /* 2.5 V = 0 */
+ *val = 2048;
+ return IIO_VAL_INT;
+ case IIO_TEMP:
+ /* 85 C = 585, 25 C = 0 */
+ *val = DIV_ROUND_CLOSEST(25 * 585, 85 - 25);
+ return IIO_VAL_INT;
+ default:
+ return -EINVAL;
+ }
+ default:
break;
}
- mutex_unlock(&indio_dev->mlock);
- return ret;
+ return -EINVAL;
}
static const struct iio_chan_spec adis16080_channels[] = {
.type = IIO_ANGL_VEL,
.modified = 1,
.channel2 = IIO_MOD_Z,
- .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
+ .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
+ IIO_CHAN_INFO_SCALE_SEPARATE_BIT,
.address = ADIS16080_DIN_GYRO,
}, {
.type = IIO_VOLTAGE,
.indexed = 1,
.channel = 0,
- .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
+ .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
+ IIO_CHAN_INFO_SCALE_SEPARATE_BIT |
+ IIO_CHAN_INFO_OFFSET_SEPARATE_BIT,
.address = ADIS16080_DIN_AIN1,
}, {
.type = IIO_VOLTAGE,
.indexed = 1,
.channel = 1,
- .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
+ .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
+ IIO_CHAN_INFO_SCALE_SEPARATE_BIT |
+ IIO_CHAN_INFO_OFFSET_SEPARATE_BIT,
.address = ADIS16080_DIN_AIN2,
}, {
.type = IIO_TEMP,
.indexed = 1,
.channel = 0,
- .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
+ .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
+ IIO_CHAN_INFO_SCALE_SEPARATE_BIT |
+ IIO_CHAN_INFO_OFFSET_SEPARATE_BIT,
.address = ADIS16080_DIN_TEMP,
}
};
.driver_module = THIS_MODULE,
};
+enum {
+ ID_ADIS16080,
+ ID_ADIS16100,
+};
+
+static const struct adis16080_chip_info adis16080_chip_info[] = {
+ [ID_ADIS16080] = {
+ /* 80 degree = 819, 819 rad = 46925 degree */
+ .scale_val = 80,
+ .scale_val2 = 46925,
+ },
+ [ID_ADIS16100] = {
+ /* 300 degree = 1230, 1230 rad = 70474 degree */
+ .scale_val = 300,
+ .scale_val2 = 70474,
+ },
+};
+
static int adis16080_probe(struct spi_device *spi)
{
+ const struct spi_device_id *id = spi_get_device_id(spi);
int ret;
struct adis16080_state *st;
struct iio_dev *indio_dev;
/* Allocate the comms buffers */
st->us = spi;
- mutex_init(&st->buf_lock);
+ st->info = &adis16080_chip_info[id->driver_data];
indio_dev->name = spi->dev.driver->name;
indio_dev->channels = adis16080_channels;
return 0;
}
+static const struct spi_device_id adis16080_ids[] = {
+ { "adis16080", ID_ADIS16080 },
+ { "adis16100", ID_ADIS16100 },
+ {},
+};
+MODULE_DEVICE_TABLE(spi, adis16080_ids);
+
static struct spi_driver adis16080_driver = {
.driver = {
.name = "adis16080",
},
.probe = adis16080_probe,
.remove = adis16080_remove,
+ .id_table = adis16080_ids,
};
module_spi_driver(adis16080_driver);
MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
MODULE_DESCRIPTION("Analog Devices ADIS16080/100 Yaw Rate Gyroscope Driver");
MODULE_LICENSE("GPL v2");
-MODULE_ALIAS("spi:adis16080");
projects / cascardo / linux.git / blobdiff