This patch adds sysfs read/write support for upper and lower irq
thresholds. So it's possible that only on certain lux ranges the
irq triggered measurement happens.
Signed-off-by: Christoph Fritz <chf.fritz@xxxxxxxxxxxxxx>
---
.../ABI/testing/sysfs-bus-iio-light-isl76683 | 17 +++++++
drivers/iio/light/isl76683.c | 58 ++++++++++++++++++++--
2 files changed, 71 insertions(+), 4 deletions(-)
create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-light-isl76683
diff --git a/Documentation/ABI/testing/sysfs-bus-iio-light-isl76683 b/Documentation/ABI/testing/sysfs-bus-iio-light-isl76683
new file mode 100644
index 0000000..c7e08d7
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-iio-light-isl76683
@@ -0,0 +1,17 @@
+What: /sys/bus/iio/devices/iio:deviceX/in_illuminance_threshold_low
+Date: November 2017
+KernelVersion: 4.15.0
+Contact: linux-iio@xxxxxxxxxxxxxxx
+Description:
+ Raw value of lower threshold for the interrupt.
+ Reading returns 8-bit MSB data of a 16-bit threshold.
+ Writing 0...255 represents 8-bit MSB data of a 16-bit threshold.
+
+What: /sys/bus/iio/devices/iio:deviceX/in_illuminance_threshold_up
+Date: November 2017
+KernelVersion: 4.15.0
+Contact: linux-iio@xxxxxxxxxxxxxxx
+Description:
+ Raw value of upper threshold for the interrupt.
+ Reading returns 8-bit MSB data of a 16-bit threshold.
+ Writing 0...255 represents 8-bit MSB data of a 16-bit threshold.
diff --git a/drivers/iio/light/isl76683.c b/drivers/iio/light/isl76683.c
index b730276..889fb85 100644
--- a/drivers/iio/light/isl76683.c
+++ b/drivers/iio/light/isl76683.c
@@ -74,11 +74,14 @@ static const int isl76683_lux_ranges_available[] = {
#define ISL76683_KOHM_MAX 1000
#define ISL76683_INTPERS_DEFAULT 0x0
#define ISL76683_THR_DEFAULT 0x7f
+#define ISL76683_THR_MAX 0xFF
struct isl76683_chip {
enum isl76683_lux_range luxrange;
int external_resistor;
enum isl76683_dmode photodiode;
+ int threshold_up;
+ int threshold_low;
struct i2c_client *client;
struct regmap *rmp;
struct completion irq_complete;
@@ -159,13 +162,11 @@ static int isl76683_set_config(struct isl76683_chip *chip)
if (ret < 0)
return ret;
- ret = regmap_write(chip->rmp, ISL76683_REG_THR_HI,
- ISL76683_THR_DEFAULT);
+ ret = regmap_write(chip->rmp, ISL76683_REG_THR_HI, chip->threshold_up);
if (ret < 0)
return ret;
- ret = regmap_write(chip->rmp, ISL76683_REG_THR_LO,
- ISL76683_THR_DEFAULT);
+ ret = regmap_write(chip->rmp, ISL76683_REG_THR_LO, chip->threshold_low);
if (ret < 0)
return ret;
@@ -415,11 +416,58 @@ static int isl76683_write_raw(struct iio_dev *indio_dev,
return -EINVAL;
}
+#define ISL76683_SYSFS_STORE(ident, _max) \
+static ssize_t in_illuminance_##ident##_store(struct device *dev, \
+ struct device_attribute *attr, \
+ const char *buf, size_t len) \
+{ \
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev); \
+ struct isl76683_chip *chip = iio_priv(indio_dev); \
+ unsigned int val; \
+ int ret; \
+ \
+ if (kstrtouint(buf, 10, &val)) \
+ return -EINVAL; \
+ \
+ if (val > _max) \
+ return -EINVAL; \
+ \
+ mutex_lock(&chip->lock); \
+ chip->ident = val; \
+ ret = isl76683_set_config(chip); \
+ mutex_unlock(&chip->lock); \
+ \
+ if (ret) \
+ return -EIO; \
+ \
+ return len; \
+}
+
+ISL76683_SYSFS_STORE(threshold_low, ISL76683_THR_MAX)
+ISL76683_SYSFS_STORE(threshold_up, ISL76683_THR_MAX)
+
+#define ISL76683_SYSFS_SHOW(ident, show_val) \
+static ssize_t in_illuminance_##ident##_show(struct device *dev, \
+ struct device_attribute *attr, char *buf) \
+{ \
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev); \
+ struct isl76683_chip *chip = iio_priv(indio_dev); \
+ \
+ return snprintf(buf, PAGE_SIZE, "%i\n", show_val); \
+}
+
+ISL76683_SYSFS_SHOW(threshold_up, chip->threshold_up)
+ISL76683_SYSFS_SHOW(threshold_low, chip->threshold_low)
+
static IIO_CONST_ATTR(in_illuminance_hardwaregain_available,
ISL76683_LUXRANGE_STR);
+static IIO_DEVICE_ATTR_RW(in_illuminance_threshold_up, 0);
+static IIO_DEVICE_ATTR_RW(in_illuminance_threshold_low, 0);
static struct attribute *isl76683_attributes[] = {
&iio_const_attr_in_illuminance_hardwaregain_available.dev_attr.attr,
+ &iio_dev_attr_in_illuminance_threshold_up.dev_attr.attr,
+ &iio_dev_attr_in_illuminance_threshold_low.dev_attr.attr,
NULL
};
@@ -535,6 +583,8 @@ static int isl76683_probe(struct i2c_client *client,
chip->luxrange = ISL76683_LUX_RANGE_DEFAULT;
chip->external_resistor = rs;
chip->photodiode = ISL76683_DIODE_DEFAULT;
+ chip->threshold_up = ISL76683_THR_DEFAULT;
+ chip->threshold_low = ISL76683_THR_DEFAULT;
chip->buffer_running = false;
chip->rmp = devm_regmap_init_i2c(client, &isl76683_regmap_config);
--
2.1.4
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