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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>
This commit is contained in:
Srinivas Pandruvada 2014-05-08 22:58:00 +01:00 committed by Jonathan Cameron
parent 124e1b1d09
commit a735e3d7f0
1 changed files with 95 additions and 5 deletions
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100
drivers/iio/accel/kxcjk-1013.c
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@ -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,
};