Le 28/09/2022 à 00:21, Mikhail Rudenko a écrit :
Add a V4L2 sub-device driver for OmniVision OV4689 image sensor. This
is a 4 Mpx image sensor using the I2C bus for control and the CSI-2
bus for data.
This driver supports following features:
- manual exposure and analog gain control support
- test pattern support
- media controller support
- runtime PM support
- support following resolutions:
+ 2688x1520 at 30 fps
The driver provides all mandatory V4L2 controls for compatibility with
libcamera. The sensor supports 1/2/4-lane CSI-2 modes, but the driver
implements 4 lane mode only at this moment.
Hi,
a few nitpick below.
CJ
Signed-off-by: Mikhail Rudenko <mike.rudenko-Re5JQEeQqe8AvxtiuMwx3w@xxxxxxxxxxxxxxxx>
---
[...]
+static int ov4689_check_sensor_id(struct ov4689 *ov4689,
+ struct i2c_client *client)
+{
+ struct device *dev = &ov4689->client->dev;
+ u32 id = 0;
+ int ret;
+
+ ret = ov4689_read_reg(client, OV4689_REG_CHIP_ID,
+ OV4689_REG_VALUE_16BIT, &id);
+ if (id != CHIP_ID) {
+ dev_err(dev, "Unexpected sensor id(%06x), ret(%d)\n", id, ret);
+ return -ENODEV;
return ret?
(otherwise what is the point of -EINVAL and -EIO in ov4689_read_reg()?)
+ }
+
+ dev_info(dev, "Detected OV%06x sensor\n", CHIP_ID);
+
+ return 0;
+}
[...]
+static int ov4689_probe(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ struct v4l2_subdev *sd;
+ struct ov4689 *ov4689;
+ int ret;
+
+ ret = ov4689_check_hwcfg(dev);
+ if (ret)
+ return ret;
+
+ ov4689 = devm_kzalloc(dev, sizeof(*ov4689), GFP_KERNEL);
+ if (!ov4689)
+ return -ENOMEM;
+
+ ov4689->client = client;
+ ov4689->cur_mode = &supported_modes[OV4689_MODE_2688_1520];
+
+ ov4689->xvclk = devm_clk_get_optional(dev, NULL);
+ if (IS_ERR(ov4689->xvclk)) {
+ return dev_err_probe(dev, PTR_ERR(ov4689->xvclk),
+ "Failed to get external clock\n");
+ }
+
+ if (!ov4689->xvclk) {
+ dev_dbg(dev,
+ "No clock provided, using clock-frequency property\n");
+ device_property_read_u32(dev, "clock-frequency", &ov4689->clock_rate);
+ } else {
+ ov4689->clock_rate = clk_get_rate(ov4689->xvclk);
+ }
+
+ if (ov4689->clock_rate != OV4689_XVCLK_FREQ) {
+ dev_err(dev,
+ "External clock rate mismatch: got %d Hz, expected %d Hz\n",
+ ov4689->clock_rate, OV4689_XVCLK_FREQ);
+ return -EINVAL;
+ }
+
+ ov4689->reset_gpio = devm_gpiod_get_optional(dev, "reset",
+ GPIOD_OUT_LOW);
+ if (IS_ERR(ov4689->reset_gpio)) {
+ dev_err(dev, "Failed to get reset-gpios\n");
+ return PTR_ERR(ov4689->reset_gpio);
+ }
+
+ ov4689->pwdn_gpio = devm_gpiod_get_optional(dev, "pwdn", GPIOD_OUT_LOW);
+ if (IS_ERR(ov4689->pwdn_gpio)) {
+ dev_err(dev, "Failed to get pwdn-gpios\n");
+ return PTR_ERR(ov4689->pwdn_gpio);
+ }
+
+ ret = ov4689_configure_regulators(ov4689);
+ if (ret) {
+ dev_err(dev, "Failed to get power regulators\n");
dev_err_probe()?
I think that devm_regulator_bulk_get() can return -EPROBE_DEFER)
+ return ret;
+ }
+
+ mutex_init(&ov4689->mutex);
+
+ sd = &ov4689->subdev;
+ v4l2_i2c_subdev_init(sd, client, &ov4689_subdev_ops);
+ ret = ov4689_initialize_controls(ov4689);
+ if (ret)
+ goto err_destroy_mutex;
+
+ ret = ov4689_power_on(dev);
+ if (ret)
+ goto err_free_handler;
+
+ ret = ov4689_check_sensor_id(ov4689, client);
+ if (ret)
+ goto err_power_off;
+
+#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
+ sd->internal_ops = &ov4689_internal_ops;
+ sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+#endif
+#if defined(CONFIG_MEDIA_CONTROLLER)
+ ov4689->pad.flags = MEDIA_PAD_FL_SOURCE;
+ sd->entity.function = MEDIA_ENT_F_CAM_SENSOR;
+ ret = media_entity_pads_init(&sd->entity, 1, &ov4689->pad);
+ if (ret < 0)
+ goto err_power_off;
+#endif
+
+ ret = v4l2_async_register_subdev_sensor(sd);
+ if (ret) {
+ dev_err(dev, "v4l2 async register subdev failed\n");
+ goto err_clean_entity;
+ }
+
+ pm_runtime_set_active(dev);
+ pm_runtime_enable(dev);
+ pm_runtime_idle(dev);
+
+ return 0;
+
+err_clean_entity:
+ media_entity_cleanup(&sd->entity);
+err_power_off:
+ ov4689_power_off(dev);
+err_free_handler:
+ v4l2_ctrl_handler_free(&ov4689->ctrl_handler);
+err_destroy_mutex:
+ mutex_destroy(&ov4689->mutex);
+
+ return ret;
+}
[...]
