This chip can operate in two modes. In one mode it can issue periodic
interrupts based on sample rate setting or when there is a motion.
Using events mechanism to allow configuration and receive events.
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxxxxxxxx>
---
drivers/iio/accel/kxcjk-1013.c | 238 +++++++++++++++++++++++++++++++++++++++--
1 file changed, 230 insertions(+), 8 deletions(-)
diff --git a/drivers/iio/accel/kxcjk-1013.c b/drivers/iio/accel/kxcjk-1013.c
index 975f8a6..f5bb682 100644
--- a/drivers/iio/accel/kxcjk-1013.c
+++ b/drivers/iio/accel/kxcjk-1013.c
@@ -27,6 +27,7 @@
#include <linux/iio/sysfs.h>
#include <linux/iio/buffer.h>
#include <linux/iio/trigger.h>
+#include <linux/iio/events.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/iio/accel/kxcjk_1013.h>
@@ -92,6 +93,9 @@ struct kxcjk1013_data {
u8 odr_bits;
u8 range;
bool active_high_intr;
+ int ev_enable_state;
+ int wake_thres;
+ int wake_dur;
bool trigger_on;
};
@@ -116,6 +120,23 @@ static const struct {
{200, 0, 0x04}, {400, 0, 0x05}, {800, 0, 0x06},
{1600, 0, 0x07} };
+static const struct {
+ int val;
+ int val2;
+ int odr_bits;
+} wake_odr_data_rate_table[] = { {0, 781000, 0x00},
+ {1, 563000, 0x01},
+ {3, 125000, 0x02},
+ {6, 250000, 0x03},
+ {12, 500000, 0x04},
+ {25, 0, 0x05},
+ {50, 0, 0x06},
+ {100, 0, 0x06},
+ {200, 0, 0x06},
+ {400, 0, 0x06},
+ {800, 0, 0x06},
+ {1600, 0, 0x06} };
+
/* Refer to section 4 of the specification */
static const struct {
int odr_bits;
@@ -283,10 +304,36 @@ static int kxcjk1013_set_power_state(struct kxcjk1013_data *data, bool on)
return 0;
}
+static int kxcjk1013_chip_update_thresholds(struct kxcjk1013_data *data)
+{
+ int ret;
+
+ ret = i2c_smbus_write_byte_data(data->client,
+ KXCJK1013_REG_WAKE_TIMER,
+ data->wake_dur);
+ if (ret < 0) {
+ dev_err(&data->client->dev,
+ "Error writing reg_wake_timer\n");
+ return ret;
+ }
+
+ ret = i2c_smbus_write_byte_data(data->client,
+ KXCJK1013_REG_WAKE_THRES,
+ data->wake_thres);
+ if (ret < 0) {
+ dev_err(&data->client->dev,
+ "Error writing reg_wake_thres\n");
+ return ret;
+ }
+
+ return 0;
+}
+
static int kxcjk1013_chip_setup_interrupt(struct kxcjk1013_data *data,
bool status)
{
int ret;
+ u8 intr_bit;
enum kxcjk1013_mode store_mode;
ret = kxcjk1013_get_mode(data, &store_mode);
@@ -316,6 +363,16 @@ static int kxcjk1013_chip_setup_interrupt(struct kxcjk1013_data *data,
return ret;
}
+ if (data->wake_thres) {
+ if (status) {
+ ret = kxcjk1013_chip_update_thresholds(data);
+ if (ret < 0)
+ return ret;
+ }
+ intr_bit = KXCJK1013_REG_CTRL1_BIT_WUFE;
+ } else
+ intr_bit = KXCJK1013_REG_CTRL1_BIT_DRDY;
+
ret = i2c_smbus_read_byte_data(data->client, KXCJK1013_REG_CTRL1);
if (ret < 0) {
dev_err(&data->client->dev, "Error reading reg_ctrl1\n");
@@ -323,9 +380,10 @@ static int kxcjk1013_chip_setup_interrupt(struct kxcjk1013_data *data,
}
if (status)
- ret |= KXCJK1013_REG_CTRL1_BIT_DRDY;
+ ret |= intr_bit;
else
- ret &= ~KXCJK1013_REG_CTRL1_BIT_DRDY;
+ ret &= ~(KXCJK1013_REG_CTRL1_BIT_WUFE |
+ KXCJK1013_REG_CTRL1_BIT_DRDY);
ret = i2c_smbus_write_byte_data(data->client,
KXCJK1013_REG_CTRL1, ret);
@@ -357,6 +415,20 @@ static int kxcjk1013_convert_freq_to_bit(int val, int val2)
return -EINVAL;
}
+static int kxcjk1013_convert_wake_odr_to_bit(int val, int val2)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(wake_odr_data_rate_table); ++i) {
+ if (wake_odr_data_rate_table[i].val == val &&
+ wake_odr_data_rate_table[i].val2 == val2) {
+ return wake_odr_data_rate_table[i].odr_bits;
+ }
+ }
+
+ return -EINVAL;
+}
+
static int kxcjk1013_set_odr(struct kxcjk1013_data *data, int val, int val2)
{
int ret;
@@ -385,6 +457,17 @@ static int kxcjk1013_set_odr(struct kxcjk1013_data *data, int val, int val2)
data->odr_bits = odr_bits;
+ odr_bits = kxcjk1013_convert_wake_odr_to_bit(val, val2);
+ if (odr_bits < 0)
+ return odr_bits;
+
+ ret = i2c_smbus_write_byte_data(data->client, KXCJK1013_REG_CTRL2,
+ odr_bits);
+ if (ret < 0) {
+ dev_err(&data->client->dev, "Error writing reg_ctrl2\n");
+ return ret;
+ }
+
if (store_mode == OPERATION) {
ret = kxcjk1013_set_mode(data, OPERATION);
if (ret < 0)
@@ -567,6 +650,94 @@ static int kxcjk1013_write_raw(struct iio_dev *indio_dev,
return ret;
}
+static int kxcjk1013_read_event(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir,
+ enum iio_event_info info,
+ int *val, int *val2)
+{
+ struct kxcjk1013_data *data = iio_priv(indio_dev);
+
+ *val2 = 0;
+ switch (info) {
+ case IIO_EV_INFO_VALUE:
+ *val = data->wake_thres;
+ break;
+ case IIO_EV_INFO_PERIOD:
+ *val = data->wake_dur;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return IIO_VAL_INT;
+}
+
+static int kxcjk1013_write_event(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir,
+ enum iio_event_info info,
+ int val, int val2)
+{
+ struct kxcjk1013_data *data = iio_priv(indio_dev);
+
+ switch (info) {
+ case IIO_EV_INFO_VALUE:
+ data->wake_thres = val;
+ break;
+ case IIO_EV_INFO_PERIOD:
+ data->wake_dur = val;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int kxcjk1013_read_event_config(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir)
+{
+
+ struct kxcjk1013_data *data = iio_priv(indio_dev);
+
+ return data->ev_enable_state;
+}
+
+static int kxcjk1013_write_event_config(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir,
+ int state)
+{
+ struct kxcjk1013_data *data = iio_priv(indio_dev);
+ int ret;
+
+ if (data->trigger_on)
+ return -EAGAIN;
+
+ if (state && data->ev_enable_state)
+ return 0;
+
+ mutex_lock(&data->mutex);
+ ret = kxcjk1013_chip_setup_interrupt(data, state);
+ if (!ret) {
+ ret = kxcjk1013_set_power_state(data, state);
+ if (ret < 0) {
+ mutex_unlock(&data->mutex);
+ return ret;
+ }
+ }
+ data->ev_enable_state = state;
+ mutex_unlock(&data->mutex);
+
+ return 0;
+}
+
static int kxcjk1013_validate_trigger(struct iio_dev *indio_dev,
struct iio_trigger *trig)
{
@@ -593,6 +764,14 @@ static const struct attribute_group kxcjk1013_attrs_group = {
.attrs = kxcjk1013_attributes,
};
+static const struct iio_event_spec kxcjk1013_event = {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_EITHER,
+ .mask_separate = BIT(IIO_EV_INFO_VALUE) |
+ BIT(IIO_EV_INFO_ENABLE) |
+ BIT(IIO_EV_INFO_PERIOD)
+};
+
#define KXCJK1013_CHANNEL(_axis) { \
.type = IIO_ACCEL, \
.modified = 1, \
@@ -608,6 +787,8 @@ static const struct attribute_group kxcjk1013_attrs_group = {
.shift = 4, \
.endianness = IIO_LE, \
}, \
+ .event_spec = &kxcjk1013_event, \
+ .num_event_specs = 1 \
}
static const struct iio_chan_spec kxcjk1013_channels[] = {
@@ -621,6 +802,10 @@ static const struct iio_info kxcjk1013_info = {
.attrs = &kxcjk1013_attrs_group,
.read_raw = kxcjk1013_read_raw,
.write_raw = kxcjk1013_write_raw,
+ .read_event_value = kxcjk1013_read_event,
+ .write_event_value = kxcjk1013_write_event,
+ .write_event_config = kxcjk1013_write_event_config,
+ .read_event_config = kxcjk1013_read_event_config,
.validate_trigger = kxcjk1013_validate_trigger,
.driver_module = THIS_MODULE,
};
@@ -675,6 +860,9 @@ static int kxcjk1013_data_rdy_trigger_set_state(struct iio_trigger *trig,
struct kxcjk1013_data *data = iio_priv(indio_dev);
int ret;
+ if (data->ev_enable_state)
+ return -EAGAIN;
+
if (state && data->trigger_on)
return 0;
@@ -699,6 +887,38 @@ static const struct iio_trigger_ops kxcjk1013_trigger_ops = {
.owner = THIS_MODULE,
};
+static irqreturn_t kxcjk1013_event_handler(int irq, void *private)
+{
+ struct iio_dev *indio_dev = private;
+ struct kxcjk1013_data *data = iio_priv(indio_dev);
+ int ret;
+
+ iio_push_event(indio_dev, IIO_MOD_EVENT_CODE(IIO_ACCEL,
+ 0,
+ IIO_MOD_X_OR_Y_OR_Z,
+ IIO_EV_TYPE_THRESH,
+ IIO_EV_DIR_EITHER),
+ iio_get_time_ns());
+
+ ret = i2c_smbus_read_byte_data(data->client, KXCJK1013_REG_INT_REL);
+ if (ret < 0)
+ dev_err(&data->client->dev, "Error reading reg_int_rel\n");
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t kxcjk1013_data_rdy_trig_poll(int irq, void *private)
+{
+ struct iio_dev *indio_dev = private;
+ struct kxcjk1013_data *data = iio_priv(indio_dev);
+
+ if (data->trigger_on) {
+ iio_trigger_poll(data->trig);
+ return IRQ_HANDLED;
+ } else
+ return IRQ_WAKE_THREAD;
+}
+
static int kxcjk1013_acpi_gpio_probe(struct i2c_client *client,
struct kxcjk1013_data *data)
{
@@ -783,11 +1003,13 @@ static int kxcjk1013_probe(struct i2c_client *client,
data->trig_mode = true;
- ret = devm_request_irq(&client->dev, client->irq,
- iio_trigger_generic_data_rdy_poll,
- IRQF_TRIGGER_RISING,
- KXCJK1013_IRQ_NAME,
- trig);
+ ret = devm_request_threaded_irq(&client->dev, client->irq,
+ kxcjk1013_data_rdy_trig_poll,
+ kxcjk1013_event_handler,
+ IRQF_TRIGGER_RISING |
+ IRQF_ONESHOT,
+ KXCJK1013_IRQ_NAME,
+ indio_dev);
if (ret) {
dev_err(&client->dev, "unable to request IRQ\n");
goto err_trigger_free;
@@ -889,7 +1111,7 @@ static int kxcjk1013_resume(struct device *dev)
mutex_lock(&data->mutex);
/* Check, if the suspend occured while active */
- if (data->trigger_on)
+ if (data->trigger_on || data->ev_enable_state)
ret = kxcjk1013_set_mode(data, OPERATION);
mutex_unlock(&data->mutex);
--
1.7.11.7
--
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