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authorSrinivas Pandruvada <srinivas.pandruvada@linux.intel.com>2014-05-08 22:58:00 +0100
committerJonathan Cameron <jic23@kernel.org>2014-08-07 11:27:41 +0100
commita735e3d7f03ab40d746290954baaf535719d9025 (patch)
tree2fce9f451e56e6775dc0e6864eea20be9be0c249 /drivers/iio/accel
parent124e1b1d0924ca51ded8bb6f52844b2bc9e485f7 (diff)
iio: accel: kxcjk-1013: Set adjustable range
This chip can support 3 different ranges. Allowing range specification. Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'drivers/iio/accel')
-rw-r--r--drivers/iio/accel/kxcjk-1013.c100
1 files changed, 95 insertions, 5 deletions
diff --git a/drivers/iio/accel/kxcjk-1013.c b/drivers/iio/accel/kxcjk-1013.c
index b32bdd10e0c4..57c515bf0fd2 100644
--- a/drivers/iio/accel/kxcjk-1013.c
+++ b/drivers/iio/accel/kxcjk-1013.c
@@ -82,6 +82,7 @@ struct kxcjk1013_data {
struct mutex mutex;
s16 buffer[8];
u8 odr_bits;
+ u8 range;
bool active_high_intr;
bool trigger_on;
};
@@ -97,6 +98,12 @@ enum kxcjk1013_mode {
OPERATION,
};
+enum kxcjk1013_range {
+ KXCJK1013_RANGE_2G,
+ KXCJK1013_RANGE_4G,
+ KXCJK1013_RANGE_8G,
+};
+
static const struct {
int val;
int val2;
@@ -116,6 +123,14 @@ static const struct {
{0x02, 21000}, {0x03, 11000}, {0x04, 6400},
{0x05, 3900}, {0x06, 2700}, {0x07, 2100} };
+static const struct {
+ u16 scale;
+ u8 gsel_0;
+ u8 gsel_1;
+} KXCJK1013_scale_table[] = { {9582, 0, 0},
+ {19163, 1, 0},
+ {38326, 0, 1} };
+
static int kxcjk1013_set_mode(struct kxcjk1013_data *data,
enum kxcjk1013_mode mode)
{
@@ -161,6 +176,32 @@ static int kxcjk1013_get_mode(struct kxcjk1013_data *data,
return 0;
}
+static int kxcjk1013_set_range(struct kxcjk1013_data *data, int range_index)
+{
+ int ret;
+
+ ret = i2c_smbus_read_byte_data(data->client, KXCJK1013_REG_CTRL1);
+ if (ret < 0) {
+ dev_err(&data->client->dev, "Error reading reg_ctrl1\n");
+ return ret;
+ }
+
+ ret |= (KXCJK1013_scale_table[range_index].gsel_0 << 3);
+ ret |= (KXCJK1013_scale_table[range_index].gsel_1 << 4);
+
+ ret = i2c_smbus_write_byte_data(data->client,
+ KXCJK1013_REG_CTRL1,
+ ret);
+ if (ret < 0) {
+ dev_err(&data->client->dev, "Error writing reg_ctrl1\n");
+ return ret;
+ }
+
+ data->range = range_index;
+
+ return 0;
+}
+
static int kxcjk1013_chip_init(struct kxcjk1013_data *data)
{
int ret;
@@ -183,10 +224,6 @@ static int kxcjk1013_chip_init(struct kxcjk1013_data *data)
return ret;
}
- /* Setting range to 4G */
- ret |= KXCJK1013_REG_CTRL1_BIT_GSEL0;
- ret &= ~KXCJK1013_REG_CTRL1_BIT_GSEL1;
-
/* Set 12 bit mode */
ret |= KXCJK1013_REG_CTRL1_BIT_RES;
@@ -197,6 +234,14 @@ static int kxcjk1013_chip_init(struct kxcjk1013_data *data)
return ret;
}
+ /* Setting range to 4G */
+ ret = kxcjk1013_set_range(data, KXCJK1013_RANGE_4G);
+ if (ret < 0)
+ return ret;
+
+ data->range = KXCJK1013_RANGE_4G;
+
+
ret = i2c_smbus_read_byte_data(data->client, KXCJK1013_REG_DATA_CTRL);
if (ret < 0) {
dev_err(&data->client->dev, "Error reading reg_data_ctrl\n");
@@ -403,6 +448,40 @@ static int kxcjk1013_get_acc_reg(struct kxcjk1013_data *data, int axis)
return ret;
}
+static int kxcjk1013_set_scale(struct kxcjk1013_data *data, int val)
+{
+ int ret, i;
+ enum kxcjk1013_mode store_mode;
+
+
+ for (i = 0; i < ARRAY_SIZE(KXCJK1013_scale_table); ++i) {
+ if (KXCJK1013_scale_table[i].scale == val) {
+
+ ret = kxcjk1013_get_mode(data, &store_mode);
+ if (ret < 0)
+ return ret;
+
+ ret = kxcjk1013_set_mode(data, STANDBY);
+ if (ret < 0)
+ return ret;
+
+ ret = kxcjk1013_set_range(data, i);
+ if (ret < 0)
+ return ret;
+
+ if (store_mode == OPERATION) {
+ ret = kxcjk1013_set_mode(data, OPERATION);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+ }
+ }
+
+ return -EINVAL;
+}
+
static int kxcjk1013_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan, int *val,
int *val2, long mask)
@@ -439,7 +518,7 @@ static int kxcjk1013_read_raw(struct iio_dev *indio_dev,
case IIO_CHAN_INFO_SCALE:
*val = 0;
- *val2 = 19163; /* range +-4g (4/2047*9.806650) */
+ *val2 = KXCJK1013_scale_table[data->range].scale;
return IIO_VAL_INT_PLUS_MICRO;
case IIO_CHAN_INFO_SAMP_FREQ:
@@ -466,6 +545,14 @@ static int kxcjk1013_write_raw(struct iio_dev *indio_dev,
ret = kxcjk1013_set_odr(data, val, val2);
mutex_unlock(&data->mutex);
break;
+ case IIO_CHAN_INFO_SCALE:
+ if (val)
+ return -EINVAL;
+
+ mutex_lock(&data->mutex);
+ ret = kxcjk1013_set_scale(data, val2);
+ mutex_unlock(&data->mutex);
+ break;
default:
ret = -EINVAL;
}
@@ -487,8 +574,11 @@ static int kxcjk1013_validate_trigger(struct iio_dev *indio_dev,
static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(
"0.781000 1.563000 3.125000 6.250000 12.500000 25 50 100 200 400 800 1600");
+static IIO_CONST_ATTR(in_accel_scale_available, "0.009582 0.019163 0.038326");
+
static struct attribute *kxcjk1013_attributes[] = {
&iio_const_attr_sampling_frequency_available.dev_attr.attr,
+ &iio_const_attr_in_accel_scale_available.dev_attr.attr,
NULL,
};