diff mbox series

[v3,1/2] iio: proximity: vl53l0x-i2c: Added sensor ID check

Message ID 20240903035636.9559-2-abhashkumarjha123@gmail.com (mailing list archive)
State Changes Requested
Headers show
Series Continuous mode support for VL53l0x | expand

Commit Message

Abhash Jha Sept. 3, 2024, 3:56 a.m. UTC
The commit adds a check for the sensor's model ID. We read the model
identification register (0xC0) and expect a value of 0xEE.

Signed-off-by: Abhash Jha <abhashkumarjha123@gmail.com>
---
 drivers/iio/proximity/vl53l0x-i2c.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

Comments

Jonathan Cameron Sept. 7, 2024, 4:40 p.m. UTC | #1
On Tue,  3 Sep 2024 09:26:35 +0530
Abhash Jha <abhashkumarjha123@gmail.com> wrote:

> The commit adds a check for the sensor's model ID. We read the model
> identification register (0xC0) and expect a value of 0xEE.
> 
> Signed-off-by: Abhash Jha <abhashkumarjha123@gmail.com>
Hi Abhash,

Small comment on the message below

> ---
>  drivers/iio/proximity/vl53l0x-i2c.c | 13 +++++++++++--
>  1 file changed, 11 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/iio/proximity/vl53l0x-i2c.c b/drivers/iio/proximity/vl53l0x-i2c.c
> index 8d4f3f849..31d6aeb95 100644
> --- a/drivers/iio/proximity/vl53l0x-i2c.c
> +++ b/drivers/iio/proximity/vl53l0x-i2c.c
> @@ -39,8 +39,11 @@
>  
>  #define VL_REG_RESULT_INT_STATUS			0x13
>  #define VL_REG_RESULT_RANGE_STATUS			0x14
> +#define VL_REG_IDENTIFICATION_MODEL_ID			0xC0
>  #define VL_REG_RESULT_RANGE_STATUS_COMPLETE		BIT(0)
>  
> +#define VL53L0X_MODEL_ID_VAL				0xEE
> +
>  struct vl53l0x_data {
>  	struct i2c_client *client;
>  	struct completion completion;
> @@ -223,6 +226,7 @@ static int vl53l0x_probe(struct i2c_client *client)
>  	struct vl53l0x_data *data;
>  	struct iio_dev *indio_dev;
>  	int error;
> +	int ret;
>  
>  	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
>  	if (!indio_dev)
> @@ -237,6 +241,13 @@ static int vl53l0x_probe(struct i2c_client *client)
>  				     I2C_FUNC_SMBUS_BYTE_DATA))
>  		return -EOPNOTSUPP;
>  
> +	ret = i2c_smbus_read_byte_data(data->client, VL_REG_IDENTIFICATION_MODEL_ID);
> +	if (ret < 0)
> +		return -EINVAL;
> +
> +	if (ret != VL53L0X_MODEL_ID_VAL)
> +		dev_info(&client->dev, "Received invalid model id: 0x%x", ret);
Unknown model id:

It's probably valid, we just don't know what it means!

> +
>  	data->vdd_supply = devm_regulator_get(&client->dev, "vdd");
>  	if (IS_ERR(data->vdd_supply))
>  		return dev_err_probe(&client->dev, PTR_ERR(data->vdd_supply),
> @@ -265,8 +276,6 @@ static int vl53l0x_probe(struct i2c_client *client)
>  
>  	/* usage of interrupt is optional */
>  	if (client->irq) {
> -		int ret;
> -
>  		init_completion(&data->completion);
>  
>  		ret = vl53l0x_configure_irq(client, indio_dev);
diff mbox series

Patch

diff --git a/drivers/iio/proximity/vl53l0x-i2c.c b/drivers/iio/proximity/vl53l0x-i2c.c
index 8d4f3f849..31d6aeb95 100644
--- a/drivers/iio/proximity/vl53l0x-i2c.c
+++ b/drivers/iio/proximity/vl53l0x-i2c.c
@@ -39,8 +39,11 @@ 
 
 #define VL_REG_RESULT_INT_STATUS			0x13
 #define VL_REG_RESULT_RANGE_STATUS			0x14
+#define VL_REG_IDENTIFICATION_MODEL_ID			0xC0
 #define VL_REG_RESULT_RANGE_STATUS_COMPLETE		BIT(0)
 
+#define VL53L0X_MODEL_ID_VAL				0xEE
+
 struct vl53l0x_data {
 	struct i2c_client *client;
 	struct completion completion;
@@ -223,6 +226,7 @@  static int vl53l0x_probe(struct i2c_client *client)
 	struct vl53l0x_data *data;
 	struct iio_dev *indio_dev;
 	int error;
+	int ret;
 
 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
 	if (!indio_dev)
@@ -237,6 +241,13 @@  static int vl53l0x_probe(struct i2c_client *client)
 				     I2C_FUNC_SMBUS_BYTE_DATA))
 		return -EOPNOTSUPP;
 
+	ret = i2c_smbus_read_byte_data(data->client, VL_REG_IDENTIFICATION_MODEL_ID);
+	if (ret < 0)
+		return -EINVAL;
+
+	if (ret != VL53L0X_MODEL_ID_VAL)
+		dev_info(&client->dev, "Received invalid model id: 0x%x", ret);
+
 	data->vdd_supply = devm_regulator_get(&client->dev, "vdd");
 	if (IS_ERR(data->vdd_supply))
 		return dev_err_probe(&client->dev, PTR_ERR(data->vdd_supply),
@@ -265,8 +276,6 @@  static int vl53l0x_probe(struct i2c_client *client)
 
 	/* usage of interrupt is optional */
 	if (client->irq) {
-		int ret;
-
 		init_completion(&data->completion);
 
 		ret = vl53l0x_configure_irq(client, indio_dev);