On Fri, 2019-12-27 at 15:21 +0300, Andrey Konovalov wrote:
> From: Dave Stevenson <dave.stevenson@xxxxxxxxxxxxxxx>
>
> Adds a driver for the 8MPix Sony IMX219 CSI2 sensor.
> Whilst the sensor supports 2 or 4 CSI2 data lanes, this driver
> currently only supports 2 lanes.
> 8MPix @ 15fps, 1080P @ 30fps (cropped FOV), and 1640x1232 (2x2 binned)
> @ 30fps are currently supported.
>
> Signed-off-by: Dave Stevenson <dave.stevenson@xxxxxxxxxxxxxxx>
> Signed-off-by: Andrey Konovalov <andrey.konovalov@xxxxxxxxxx>
> ---
> drivers/media/i2c/Kconfig | 12 +
> drivers/media/i2c/Makefile | 1 +
> drivers/media/i2c/imx219.c | 1240 ++++++++++++++++++++++++++++++++++++
> 3 files changed, 1253 insertions(+)
> create mode 100644 drivers/media/i2c/imx219.c
>
>
[..]
> +
> +static int imx219_probe(struct i2c_client *client,
> + const struct i2c_device_id *id)
> +{
> + struct device *dev = &client->dev;
> + struct fwnode_handle *endpoint;
> + struct imx219 *imx219;
> + int ret;
> +
> + imx219 = devm_kzalloc(&client->dev, sizeof(*imx219), GFP_KERNEL);
> + if (!imx219)
> + return -ENOMEM;
> +
> + imx219->dev = dev;
> +
> + v4l2_i2c_subdev_init(&imx219->sd, client, &imx219_subdev_ops);
> +
> + /* Get CSI2 bus config */
> + endpoint = fwnode_graph_get_next_endpoint(dev_fwnode(&client->dev),
> + NULL);
> + if (!endpoint) {
> + dev_err(dev, "endpoint node not found\n");
> + return -EINVAL;
> + }
> +
> + ret = v4l2_fwnode_endpoint_parse(endpoint, &imx219->ep);
> + fwnode_handle_put(endpoint);
> + if (ret) {
> + dev_err(dev, "Could not parse endpoint\n");
> + return ret;
> + }
> +
> + /* Get system clock (xclk) */
> + imx219->xclk = devm_clk_get(dev, "xclk");
> + if (IS_ERR(imx219->xclk)) {
> + dev_err(dev, "failed to get xclk\n");
> + return PTR_ERR(imx219->xclk);
> + }
> +
> + imx219->xclk_freq = clk_get_rate(imx219->xclk);
> + if (imx219->xclk_freq != IMX219_XCLK_FREQ) {
> + dev_err(dev, "xclk frequency not supported: %d Hz\n",
> + imx219->xclk_freq);
> + return -EINVAL;
> + }
> +
> + ret = imx219_get_regulators(imx219);
> + if (ret)
> + return ret;
> +
I think printing an error if you can't regulators
(as the core will stay silent), is a good idea.
Just got bitten by this while trying the driver with
a RPI camera module v2, and the RKISP1 patches that
we recently posted on this mailing list.
(did _very_ limited testing, but working nicely so far).
> + /* Request optional enable pin */
> + imx219->xclr_gpio = devm_gpiod_get_optional(dev, "xclr",
> + GPIOD_OUT_HIGH);
> +
> + /*
> + * The sensor must be powered for imx219_identify_module()
> + * to be able to read the CHIP_ID register
> + */
> + ret = imx219_power_on(dev);
> + if (ret)
> + return ret;
> +
> + ret = imx219_identify_module(imx219);
> + if (ret)
> + goto error_power_off;
> +
> + /* Set default mode to max resolution */
> + imx219->mode = &supported_modes[0];
> +
> + ret = imx219_init_controls(imx219);
> + if (ret)
> + goto error_power_off;
> +
> + /* Initialize subdev */
> + imx219->sd.internal_ops = &imx219_internal_ops;
> + imx219->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> + imx219->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
> +
> + /* Initialize source pad */
> + imx219->pad.flags = MEDIA_PAD_FL_SOURCE;
> +
> + ret = media_entity_pads_init(&imx219->sd.entity, 1, &imx219->pad);
> + if (ret)
> + goto error_handler_free;
> +
> + ret = v4l2_async_register_subdev_sensor_common(&imx219->sd);
> + if (ret < 0)
> + goto error_media_entity;
> +
Ditto on these last two, it's possible to get silent
failures here, which are a bit annoying to debug.
Thanks,
Ezequiel
