[PATCH 1/7] iio: light: al3320a slightly improve code formatting

[PATCH 1/7] iio: light: al3320a slightly improve code formatting

[David Heidelberg]

Modified to be in part with al3010 driver.

Signed-off-by: David Heidelberg <david@ixit.cz>
---
 drivers/iio/light/al3320a.c | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/drivers/iio/light/al3320a.c b/drivers/iio/light/al3320a.c
index a21aa99e74e4..613830b7df6e 100644
--- a/drivers/iio/light/al3320a.c
+++ b/drivers/iio/light/al3320a.c
@@ -38,6 +38,11 @@
 
 #define AL3320A_GAIN_SHIFT		1
 #define AL3320A_GAIN_MASK		(BIT(2) | BIT(1))
+#define AL3320A_GAIN_READ(g) \
+	(((g) & AL3320A_GAIN_MASK) >> AL3320A_GAIN_SHIFT)
+#define AL3320A_GAIN_WRITE(g) \
+	(((g) << AL3320A_GAIN_SHIFT) & AL3320A_GAIN_MASK)
+
 
 /* chip params default values */
 #define AL3320A_DEFAULT_MEAN_TIME	4
@@ -90,7 +95,7 @@ static int al3320a_init(struct al3320a_data *data)
 		return ret;
 
 	ret = i2c_smbus_write_byte_data(data->client, AL3320A_REG_CONFIG_RANGE,
-					AL3320A_RANGE_3 << AL3320A_GAIN_SHIFT);
+					AL3320A_GAIN_WRITE(AL3320A_RANGE_3));
 	if (ret < 0)
 		return ret;
 
@@ -133,7 +138,7 @@ static int al3320a_read_raw(struct iio_dev *indio_dev,
 		if (ret < 0)
 			return ret;
 
-		ret = (ret & AL3320A_GAIN_MASK) >> AL3320A_GAIN_SHIFT;
+		ret = AL3320A_GAIN_READ(ret);
 		*val = al3320a_scales[ret][0];
 		*val2 = al3320a_scales[ret][1];
 
@@ -152,11 +157,13 @@ static int al3320a_write_raw(struct iio_dev *indio_dev,
 	switch (mask) {
 	case IIO_CHAN_INFO_SCALE:
 		for (i = 0; i < ARRAY_SIZE(al3320a_scales); i++) {
-			if (val == al3320a_scales[i][0] &&
-			    val2 == al3320a_scales[i][1])
-				return i2c_smbus_write_byte_data(data->client,
-					AL3320A_REG_CONFIG_RANGE,
-					i << AL3320A_GAIN_SHIFT);
+			if (val != al3320a_scales[i][0] ||
+			    val2 != al3320a_scales[i][1])
+				continue;
+
+			return i2c_smbus_write_byte_data(data->client,
+						AL3320A_REG_CONFIG_RANGE,
+						AL3320A_GAIN_WRITE(i));
 		}
 		break;
 	}
-- 
2.25.0

[PATCH 2/7] iio: light: add Dyna-Image AL3010 driver

[David Heidelberg]

Based on:
- 3320A in-kernel driver
- https://www.spinics.net/lists/linux-iio/msg25145.html
- https://lore.kernel.org/patchwork/patch/684179/

I decided to keep it aside of AL3320A due to different approach and much
simpler design of 3010.

Tested on Nexus 7 2012 (grouper/tilapia).

Tested-by: David Heidelberg <david@ixit.cz>
Tested-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: David Heidelberg <david@ixit.cz>
---
 drivers/iio/light/Kconfig  |  10 ++
 drivers/iio/light/Makefile |   1 +
 drivers/iio/light/al3010.c | 218 +++++++++++++++++++++++++++++++++++++
 3 files changed, 229 insertions(+)
 create mode 100644 drivers/iio/light/al3010.c

diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
index 9968f982fbc7..43d9b830279d 100644
--- a/drivers/iio/light/Kconfig
+++ b/drivers/iio/light/Kconfig
@@ -43,6 +43,16 @@ config ADUX1020
 	 To compile this driver as a module, choose M here: the
 	 module will be called adux1020.
 
+config AL3010
+	tristate "AL3010 ambient light sensor"
+	depends on I2C
+	help
+	  Say Y here if you want to build a driver for the Dyna Image AL3010
+	  ambient light sensor.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called al3010.
+
 config AL3320A
 	tristate "AL3320A ambient light sensor"
 	depends on I2C
diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile
index c98d1cefb861..88bb93550fcc 100644
--- a/drivers/iio/light/Makefile
+++ b/drivers/iio/light/Makefile
@@ -7,6 +7,7 @@
 obj-$(CONFIG_ACPI_ALS)		+= acpi-als.o
 obj-$(CONFIG_ADJD_S311)		+= adjd_s311.o
 obj-$(CONFIG_ADUX1020)		+= adux1020.o
+obj-$(CONFIG_AL3010)		+= al3010.o
 obj-$(CONFIG_AL3320A)		+= al3320a.o
 obj-$(CONFIG_APDS9300)		+= apds9300.o
 obj-$(CONFIG_APDS9960)		+= apds9960.o
diff --git a/drivers/iio/light/al3010.c b/drivers/iio/light/al3010.c
new file mode 100644
index 000000000000..863854415d5d
--- /dev/null
+++ b/drivers/iio/light/al3010.c
@@ -0,0 +1,218 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * AL3010 - Dyna Image Ambient Light Sensor
+ *
+ * Copyright (c) 2014, Intel Corporation.
+ * Copyright (c) 2016, Dyna-Image Corp.
+ *
+ * IIO driver for AL3010 (7-bit I2C slave address 0x1C).
+ *
+ * TODO: interrupt support, thresholds
+ */
+
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+#define AL3010_DRV_NAME "al3010"
+
+#define AL3010_REG_SYSTEM		0x00
+#define AL3010_REG_DATA_LOW		0x0c
+#define AL3010_REG_CONFIG		0x10
+
+#define AL3010_CONFIG_DISABLE		0x00
+#define AL3010_CONFIG_ENABLE		0x01
+
+#define AL3010_GAIN_SHIFT		4
+#define AL3010_GAIN_MASK		(BIT(6) | BIT(5) | BIT(4))
+
+#define AL3010_GAIN_READ(g) \
+	(((g) & AL3010_GAIN_MASK) >> AL3010_GAIN_SHIFT)
+
+#define AL3010_GAIN_WRITE(g) \
+	(((g) << AL3010_GAIN_SHIFT) & AL3010_GAIN_MASK)
+
+#define AL3010_SCALE_AVAILABLE "1.1872 0.2968 0.0742 0.018"
+
+enum al3xxxx_range {
+	AL3XXX_RANGE_1, /* 77806 lx */
+	AL3XXX_RANGE_2, /* 19542 lx */
+	AL3XXX_RANGE_3, /*  4863 lx */
+	AL3XXX_RANGE_4  /*  1216 lx */
+};
+
+static const int al3010_scales[][2] = {
+	{0, 1187200}, {0, 296800}, {0, 74200}, {0, 18600}
+};
+
+struct al3010_data {
+	struct i2c_client *client;
+};
+
+static const struct iio_chan_spec al3010_channels[] = {
+	{
+		.type	= IIO_LIGHT,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+				      BIT(IIO_CHAN_INFO_SCALE),
+	}
+};
+
+static IIO_CONST_ATTR(in_illuminance_scale_available, AL3010_SCALE_AVAILABLE);
+
+static struct attribute *al3010_attributes[] = {
+	&iio_const_attr_in_illuminance_scale_available.dev_attr.attr,
+	NULL,
+};
+
+static const struct attribute_group al3010_attribute_group = {
+	.attrs = al3010_attributes,
+};
+
+static int al3010_init(struct al3010_data *data)
+{
+	int ret;
+
+	/* power on */
+	ret = i2c_smbus_write_byte_data(data->client, AL3010_REG_SYSTEM,
+					AL3010_CONFIG_ENABLE);
+	if (ret < 0)
+		return ret;
+
+	ret = i2c_smbus_write_byte_data(data->client, AL3010_REG_CONFIG,
+					AL3010_GAIN_WRITE(AL3XXX_RANGE_3));
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int al3010_read_raw(struct iio_dev *indio_dev,
+			   struct iio_chan_spec const *chan, int *val,
+			   int *val2, long mask)
+{
+	struct al3010_data *data = iio_priv(indio_dev);
+	int ret;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		/*
+		 * ALS ADC value is stored in two adjacent registers:
+		 * - low byte of output is stored at AL3010_REG_DATA_LOW
+		 * - high byte of output is stored at AL3010_REG_DATA_LOW + 1
+		 */
+		ret = i2c_smbus_read_word_data(data->client,
+					       AL3010_REG_DATA_LOW);
+		if (ret < 0)
+			return ret;
+		*val = ret;
+		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_SCALE:
+		ret = i2c_smbus_read_byte_data(data->client,
+					       AL3010_REG_CONFIG);
+		if (ret < 0)
+			return ret;
+
+		ret = AL3010_GAIN_READ(ret);
+		*val = al3010_scales[ret][0];
+		*val2 = al3010_scales[ret][1];
+
+		return IIO_VAL_INT_PLUS_MICRO;
+	}
+	return -EINVAL;
+}
+
+static int al3010_write_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *chan, int val,
+			    int val2, long mask)
+{
+	struct al3010_data *data = iio_priv(indio_dev);
+	int i;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_SCALE:
+		for (i = 0; i < ARRAY_SIZE(al3010_scales); i++) {
+			if (val != al3010_scales[i][0] ||
+			    val2 != al3010_scales[i][1])
+				continue;
+
+			return i2c_smbus_write_byte_data(data->client,
+						AL3010_REG_CONFIG,
+						AL3010_GAIN_WRITE(i));
+		}
+		break;
+	}
+	return -EINVAL;
+}
+
+static const struct iio_info al3010_info = {
+	.read_raw	= al3010_read_raw,
+	.write_raw	= al3010_write_raw,
+	.attrs		= &al3010_attribute_group,
+};
+
+static int al3010_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
+{
+	struct al3010_data *data;
+	struct iio_dev *indio_dev;
+	int ret;
+
+	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	data = iio_priv(indio_dev);
+	i2c_set_clientdata(client, indio_dev);
+	data->client = client;
+
+	indio_dev->dev.parent = &client->dev;
+	indio_dev->info = &al3010_info;
+	indio_dev->name = AL3010_DRV_NAME;
+	indio_dev->channels = al3010_channels;
+	indio_dev->num_channels = ARRAY_SIZE(al3010_channels);
+	indio_dev->modes = INDIO_DIRECT_MODE;
+
+	ret = al3010_init(data);
+	if (ret < 0) {
+		dev_err(&client->dev, "al3010 chip init failed\n");
+		return ret;
+	}
+	return devm_iio_device_register(&client->dev, indio_dev);
+}
+
+static int al3010_remove(struct i2c_client *client)
+{
+	return i2c_smbus_write_byte_data(client, AL3010_REG_SYSTEM,
+					 AL3010_CONFIG_DISABLE);
+}
+
+static const struct i2c_device_id al3010_id[] = {
+	{"al3010", 0},
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, al3010_id);
+
+static const struct of_device_id al3010_of_match[] = {
+	{ .compatible = "dynaimage,al3010", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, al3010_of_match);
+
+static struct i2c_driver al3010_driver = {
+	.driver = {
+		.name = AL3010_DRV_NAME,
+		.of_match_table = al3010_of_match,
+	},
+	.probe		= al3010_probe,
+	.remove		= al3010_remove,
+	.id_table	= al3010_id,
+};
+
+module_i2c_driver(al3010_driver);
+
+MODULE_AUTHOR("Daniel Baluta <daniel.baluta@intel.com>");
+MODULE_DESCRIPTION("AL3010 Ambient Light Sensor driver");
+MODULE_LICENSE("GPL v2");
-- 
2.25.0

[PATCH 3/7] dt-bindings: iio: light: add support for Dyna-Image AL3320A

[David Heidelberg]

This commit add dt-bindings support to al3320a driver and vendor-prefix
dynaimage.
Partly based on unmerged commit:
"iio: Add Dyna-Image AP3223 ambient light and proximity driver"

Signed-off-by: David Heidelberg <david@ixit.cz>
---
 .../bindings/iio/light/al3320a.yaml           | 40 +++++++++++++++++++
 .../devicetree/bindings/vendor-prefixes.yaml  |  2 +
 2 files changed, 42 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/light/al3320a.yaml

diff --git a/Documentation/devicetree/bindings/iio/light/al3320a.yaml b/Documentation/devicetree/bindings/iio/light/al3320a.yaml
new file mode 100644
index 000000000000..5b6b0061dee7
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/light/al3320a.yaml
@@ -0,0 +1,40 @@
+# SPDX-License-Identifier: (GPL-2.0-only)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/light/al3320a.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Dyna-Image AL3320A sensor
+
+maintainers:
+  - Daniel Baluta <daniel.baluta@intel.com>
+
+properties:
+  compatible:
+    const: dynaimage,al3320a
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  vdd-supply:
+    description: Regulator that provides power to the sensor
+
+required:
+  - compatible
+  - reg
+  - interrupt
+  - vdd-supply
+
+examples:
+  - |
+    i2c {
+        al3320a@1c {
+            compatible = "dynaimage,al3320a";
+            reg = <0x1c>;
+            vdd-supply = <&vdd_reg>;
+            interrupts = <0 99 4>;
+        };
+    };
diff --git a/Documentation/devicetree/bindings/vendor-prefixes.yaml b/Documentation/devicetree/bindings/vendor-prefixes.yaml
index 3dab8150dae7..b36588769cbd 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.yaml
+++ b/Documentation/devicetree/bindings/vendor-prefixes.yaml
@@ -265,6 +265,8 @@ patternProperties:
     description: Dragino Technology Co., Limited
   "^dserve,.*":
     description: dServe Technology B.V.
+  "^dynaimage,.*":
+    description: Dyna-Image
   "^ea,.*":
     description: Embedded Artists AB
   "^ebs-systart,.*":
-- 
2.25.0

[PATCH 4/7] dt-bindings: iio: light: add support for Dyna-Image AL3010

[David Heidelberg]

The Dyna-Image AL3010 is a 16-bit digital ambient light sensor which
provides a multiple gain function with linear response over a dynamic
range 1216/4863/19452/77806.

Signed-off-by: David Heidelberg <david@ixit.cz>
---
 .../devicetree/bindings/iio/light/al3010.yaml | 40 +++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/light/al3010.yaml

diff --git a/Documentation/devicetree/bindings/iio/light/al3010.yaml b/Documentation/devicetree/bindings/iio/light/al3010.yaml
new file mode 100644
index 000000000000..9cd1f34a6d63
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/light/al3010.yaml
@@ -0,0 +1,40 @@
+# SPDX-License-Identifier: (GPL-2.0-only)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/light/al3010.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Dyna-Image AL3010 sensor
+
+maintainers:
+  - David Heidelberg <david@ixit.cz>
+
+properties:
+  compatible:
+    const: dynaimage,al3010
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  vdd-supply:
+    description: Regulator that provides power to the sensor
+
+required:
+  - compatible
+  - reg
+  - interrupt
+  - vdd-supply
+
+examples:
+  - |
+    i2c {
+        al3010@1c {
+            compatible = "dynaimage,al3010";
+            reg = <0x1c>;
+            vdd-supply = <&vdd_reg>;
+            interrupts = <0 99 4>;
+        };
+    };
-- 
2.25.0

[PATCH 5/7] iio: light: al3010 implement suspend support

[David Heidelberg]

AL3010 is fairly simple chip, so for suspend is enough to disable and
later enable it again.

Signed-off-by: David Heidelberg <david@ixit.cz>
---
 drivers/iio/light/al3010.c | 30 +++++++++++++++++++++++++-----
 1 file changed, 25 insertions(+), 5 deletions(-)

diff --git a/drivers/iio/light/al3010.c b/drivers/iio/light/al3010.c
index 863854415d5d..29e54e2bfc81 100644
--- a/drivers/iio/light/al3010.c
+++ b/drivers/iio/light/al3010.c
@@ -8,6 +8,9 @@
  * IIO driver for AL3010 (7-bit I2C slave address 0x1C).
  *
  * TODO: interrupt support, thresholds
+ * When the driver will get support for interrupt handling, then interrupt
+ * will need to be disabled before turning sensor OFF in order to avoid
+ * potential races with the interrupt handling.
  */
 
 #include <linux/i2c.h>
@@ -71,13 +74,18 @@ static const struct attribute_group al3010_attribute_group = {
 	.attrs = al3010_attributes,
 };
 
+static int al3010_set_pwr(struct i2c_client *client, bool pwr)
+{
+	u8 val = pwr ? AL3010_CONFIG_ENABLE : AL3010_CONFIG_DISABLE;
+	return i2c_smbus_write_byte_data(client, AL3010_REG_SYSTEM, val);
+}
+
 static int al3010_init(struct al3010_data *data)
 {
 	int ret;
 
-	/* power on */
-	ret = i2c_smbus_write_byte_data(data->client, AL3010_REG_SYSTEM,
-					AL3010_CONFIG_ENABLE);
+	ret = al3010_set_pwr(data->client, true);
+
 	if (ret < 0)
 		return ret;
 
@@ -185,10 +193,21 @@ static int al3010_probe(struct i2c_client *client,
 
 static int al3010_remove(struct i2c_client *client)
 {
-	return i2c_smbus_write_byte_data(client, AL3010_REG_SYSTEM,
-					 AL3010_CONFIG_DISABLE);
+	return al3010_set_pwr(client, false);
 }
 
+static int __maybe_unused al3010_suspend(struct device *dev)
+{
+	return al3010_set_pwr(to_i2c_client(dev), false);
+}
+
+static int __maybe_unused al3010_resume(struct device *dev)
+{
+	return al3010_set_pwr(to_i2c_client(dev), true);
+}
+
+SIMPLE_DEV_PM_OPS(al3010_pm_ops, al3010_suspend, al3010_resume);
+
 static const struct i2c_device_id al3010_id[] = {
 	{"al3010", 0},
 	{}
@@ -205,6 +224,7 @@ static struct i2c_driver al3010_driver = {
 	.driver = {
 		.name = AL3010_DRV_NAME,
 		.of_match_table = al3010_of_match,
+		.pm = &al3010_pm_ops,
 	},
 	.probe		= al3010_probe,
 	.remove		= al3010_remove,
-- 
2.25.0

[PATCH 6/7] iio: light: al3320a implement suspend support

[David Heidelberg]

AL3320a is fairly simple chip, so for suspend is enough to disable and
later enable it again.

Signed-off-by: David Heidelberg <david@ixit.cz>
---
 drivers/iio/light/al3320a.c | 31 ++++++++++++++++++++++++++-----
 1 file changed, 26 insertions(+), 5 deletions(-)

diff --git a/drivers/iio/light/al3320a.c b/drivers/iio/light/al3320a.c
index 613830b7df6e..d99f9d139b5f 100644
--- a/drivers/iio/light/al3320a.c
+++ b/drivers/iio/light/al3320a.c
@@ -7,6 +7,9 @@
  * IIO driver for AL3320A (7-bit I2C slave address 0x1C).
  *
  * TODO: interrupt support, thresholds
+ * When the driver will get support for interrupt handling, then interrupt
+ * will need to be disabled before turning sensor OFF in order to avoid
+ * potential races with the interrupt handling.
  */
 
 #include <linux/module.h>
@@ -84,13 +87,19 @@ static const struct attribute_group al3320a_attribute_group = {
 	.attrs = al3320a_attributes,
 };
 
+static int al3320a_set_pwr(struct i2c_client *client, bool pwr)
+{
+	u8 val = pwr ? AL3320A_CONFIG_ENABLE : AL3320A_CONFIG_DISABLE;
+	return i2c_smbus_write_byte_data(data->client, AL3320A_REG_CONFIG, val);
+}
+
+
 static int al3320a_init(struct al3320a_data *data)
 {
 	int ret;
 
-	/* power on */
-	ret = i2c_smbus_write_byte_data(data->client, AL3320A_REG_CONFIG,
-					AL3320A_CONFIG_ENABLE);
+	ret = al3320a_set_pwr(data->client, true);
+
 	if (ret < 0)
 		return ret;
 
@@ -208,10 +217,21 @@ static int al3320a_probe(struct i2c_client *client,
 
 static int al3320a_remove(struct i2c_client *client)
 {
-	return i2c_smbus_write_byte_data(client, AL3320A_REG_CONFIG,
-					 AL3320A_CONFIG_DISABLE);
+	return al3320a_set_pwr(client, false);
+}
+
+static int __maybe_unused al3320a_suspend(struct device *dev)
+{
+	return al3320a_set_pwr(to_i2c_client(dev), false);
+}
+
+static int __maybe_unused al3320a_resume(struct device *dev)
+{
+	return al3320a_set_pwr(to_i2c_client(dev), true);
 }
 
+SIMPLE_DEV_PM_OPS(al3320a_pm_ops, al3320a_suspend, al3320a_resume);
+
 static const struct i2c_device_id al3320a_id[] = {
 	{"al3320a", 0},
 	{}
@@ -221,6 +241,7 @@ MODULE_DEVICE_TABLE(i2c, al3320a_id);
 static struct i2c_driver al3320a_driver = {
 	.driver = {
 		.name = AL3320A_DRV_NAME,
+		.pm = &al3320a_pm_ops,
 	},
 	.probe		= al3320a_probe,
 	.remove		= al3320a_remove,
-- 
2.25.0

[PATCH 7/7] iio: light: al3320a allow module autoload when defined in dts

[David Heidelberg]

- also drop init.h and alphabetically sort

Signed-off-by: David Heidelberg <david@ixit.cz>
---
 drivers/iio/light/al3320a.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/light/al3320a.c b/drivers/iio/light/al3320a.c
index d99f9d139b5f..d66c85b27907 100644
--- a/drivers/iio/light/al3320a.c
+++ b/drivers/iio/light/al3320a.c
@@ -12,9 +12,9 @@
  * potential races with the interrupt handling.
  */
 
-#include <linux/module.h>
-#include <linux/init.h>
 #include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of.h>
 
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
@@ -238,9 +238,16 @@ static const struct i2c_device_id al3320a_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, al3320a_id);
 
+static const struct of_device_id al3320a_of_match[] = {
+	{ .compatible = "dynaimage,al3320a", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, al3320a_of_match);
+
 static struct i2c_driver al3320a_driver = {
 	.driver = {
 		.name = AL3320A_DRV_NAME,
+		.of_match_table = al3320a_of_match,
 		.pm = &al3320a_pm_ops,
 	},
 	.probe		= al3320a_probe,
-- 
2.25.0