From: André Apitzsch <git@xxxxxxxxxxx> Check the chip ID and stop probing if it is no imx214 sensor. Signed-off-by: André Apitzsch <git@xxxxxxxxxxx> --- drivers/media/i2c/imx214.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/drivers/media/i2c/imx214.c b/drivers/media/i2c/imx214.c index ce6d8a90f4a1..6493a9b9ea88 100644 --- a/drivers/media/i2c/imx214.c +++ b/drivers/media/i2c/imx214.c @@ -20,6 +20,10 @@ #include <media/v4l2-fwnode.h> #include <media/v4l2-subdev.h> +/* Chip ID */ +#define IMX214_REG_CHIP_ID CCI_REG16(0x0016) +#define IMX214_CHIP_ID 0x0214 + #define IMX214_REG_MODE_SELECT CCI_REG8(0x0100) #define IMX214_MODE_STANDBY 0x00 #define IMX214_MODE_STREAMING 0x01 @@ -1168,6 +1172,27 @@ static int imx214_get_regulators(struct device *dev, struct imx214 *imx214) imx214->supplies); } +/* Verify chip ID */ +static int imx214_identify_module(struct imx214 *imx214) +{ + struct i2c_client *client = v4l2_get_subdevdata(&imx214->sd); + int ret; + u64 val; + + ret = cci_read(imx214->regmap, IMX214_REG_CHIP_ID, &val, NULL); + if (ret) + return dev_err_probe(&client->dev, ret, + "failed to read chip id %x\n", + IMX214_CHIP_ID); + + if (val != IMX214_CHIP_ID) + return dev_err_probe(&client->dev, -EIO, + "chip id mismatch: %x!=%llx\n", + IMX214_CHIP_ID, val); + + return 0; +} + static int imx214_parse_fwnode(struct device *dev, struct imx214 *imx214) { struct fwnode_handle *endpoint; @@ -1261,6 +1286,10 @@ static int imx214_probe(struct i2c_client *client) */ imx214_power_on(imx214->dev); + ret = imx214_identify_module(imx214); + if (ret) + goto error_power_off; + pm_runtime_set_active(imx214->dev); pm_runtime_enable(imx214->dev); pm_runtime_idle(imx214->dev); -- 2.46.0