Hi Todor,
Thanks for the patch, few comments below.
On 05/18/2016 02:50 PM, Todor Tomov wrote:
> The ov5645 sensor from Omnivision supports up to 2592x1944
> and CSI2 interface.
>
> The driver adds support for the following modes:
> - 1280x960
> - 1920x1080
> - 2592x1944
>
> Output format is packed 8bit UYVY.
>
> Signed-off-by: Todor Tomov <todor.tomov@xxxxxxxxxx>
> ---
> drivers/media/i2c/Kconfig | 11 +
> drivers/media/i2c/Makefile | 1 +
> drivers/media/i2c/ov5645.c | 1425 ++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 1437 insertions(+)
> create mode 100644 drivers/media/i2c/ov5645.c
>
> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> index 521bbf1..aa17eba 100644
> --- a/drivers/media/i2c/Kconfig
> +++ b/drivers/media/i2c/Kconfig
> @@ -490,6 +490,17 @@ config VIDEO_OV2659
> To compile this driver as a module, choose M here: the
> module will be called ov2659.
>
> +config VIDEO_OV5645
> + tristate "OmniVision OV5645 sensor support"
> + depends on I2C && VIDEO_V4L2
> + depends on MEDIA_CAMERA_SUPPORT
depends on OF ?
<cut>
> +
> +struct ov5645 {
> + struct i2c_client *i2c_client;
> + struct device *dev;
> + struct v4l2_subdev sd;
> + struct media_pad pad;
> + struct v4l2_of_endpoint ep;
> + struct v4l2_mbus_framefmt fmt;
> + struct v4l2_rect crop;
> + struct clk *xclk;
> + u32 xclk_freq;
this become unused?
> +
> + struct regulator *io_regulator;
> + struct regulator *core_regulator;
> + struct regulator *analog_regulator;
> +
> + enum ov5645_mode current_mode;
> +
> + /* Cached control values */
> + struct v4l2_ctrl_handler ctrls;
> + struct v4l2_ctrl *saturation;
> + struct v4l2_ctrl *hflip;
> + struct v4l2_ctrl *vflip;
> + struct v4l2_ctrl *autogain;
> + struct v4l2_ctrl *autoexposure;
> + struct v4l2_ctrl *awb;
> + struct v4l2_ctrl *pattern;
> +
> + struct mutex power_lock; /* lock to protect power state */
> + int power;
> +
> + struct gpio_desc *pwdn_gpio;
> + struct gpio_desc *rst_gpio;
> +};
> +
> +static inline struct ov5645 *to_ov5645(struct v4l2_subdev *sd)
> +{
> + return container_of(sd, struct ov5645, sd);
> +}
<cut>
> +static int ov5645_s_power(struct v4l2_subdev *sd, int on)
> +{
> + struct ov5645 *ov5645 = to_ov5645(sd);
> + int ret = 0;
> +
> + dev_dbg(ov5645->dev, "%s: on = %d\n", __func__, on);
> +
> + mutex_lock(&ov5645->power_lock);
> +
> + /* If the power count is modified from 0 to != 0 or from != 0 to 0,
> + * update the power state.
> + */
> + if (ov5645->power == !on) {
> + if (on) {
> + ret = ov5645_set_power_on(ov5645);
> + if (ret < 0) {
> + dev_err(ov5645->dev, "could not set power %s\n",
> + on ? "on" : "off");
> + goto exit;
> + }
> +
> + ret = ov5645_init(ov5645);
> + if (ret < 0) {
> + dev_err(ov5645->dev,
> + "could not set init registers\n");
> + goto exit;
> + }
> +
> + ov5645_write_reg(ov5645, OV5645_SYSTEM_CTRL0,
> + OV5645_SYSTEM_CTRL0_STOP);
please check the error code.
> + } else {
> + ov5645_set_power_off(ov5645);
> + }
> +
> + /* Update the power count. */
> + ov5645->power += on ? 1 : -1;
> + WARN_ON(ov5645->power < 0);
> + }
> +
> +exit:
> + mutex_unlock(&ov5645->power_lock);
> +
> + return ret;
> +}
> +
<cut>
> +
> +static int ov5645_registered(struct v4l2_subdev *subdev)
> +{
> + struct i2c_client *client = v4l2_get_subdevdata(subdev);
> + struct ov5645 *ov5645 = to_ov5645(subdev);
> + u8 chip_id_high, chip_id_low;
> + int ret;
> +
> + ov5645_s_power(&ov5645->sd, true);
check for error here and on the other places where call s_power.
> +
> + ret = ov5645_read_reg(ov5645, OV5645_CHIP_ID_HIGH_REG, &chip_id_high);
> + if (ret < 0 || chip_id_high != OV5645_CHIP_ID_HIGH) {
> + dev_err(ov5645->dev, "could not read ID high\n");
> + ret = -ENODEV;
> + goto reg_power_off;
> + }
> + ret = ov5645_read_reg(ov5645, OV5645_CHIP_ID_LOW_REG, &chip_id_low);
> + if (ret < 0 || chip_id_low != OV5645_CHIP_ID_LOW) {
> + dev_err(ov5645->dev, "could not read ID low\n");
> + ret = -ENODEV;
> + goto reg_power_off;
> + }
> +
> + dev_info(&client->dev, "OV5645 detected at address 0x%02x\n",
> + client->addr);
> +
> + ov5645_s_power(&ov5645->sd, false);
> +
> + return 0;
> +
> +reg_power_off:
> + ov5645_s_power(&ov5645->sd, false);
> + return ret;
> +}
> +
> +static int ov5645_s_stream(struct v4l2_subdev *subdev, int enable)
> +{
> + struct ov5645 *ov5645 = to_ov5645(subdev);
> + int ret;
> +
> + dev_dbg(ov5645->dev, "%s: enable = %d\n", __func__, enable);
> +
> + if (enable) {
> + ret = ov5645_change_mode(ov5645, ov5645->current_mode);
> + if (ret < 0) {
> + dev_err(ov5645->dev, "could not set mode %d\n",
> + ov5645->current_mode);
> + return ret;
> + }
> + ret = v4l2_ctrl_handler_setup(&ov5645->ctrls);
> + if (ret < 0) {
> + dev_err(ov5645->dev, "could not sync v4l2 controls\n");
> + return ret;
> + }
> + ov5645_write_reg(ov5645, OV5645_SYSTEM_CTRL0,
> + OV5645_SYSTEM_CTRL0_START);
Error code check here and below.
> + } else {
> + ov5645_write_reg(ov5645, OV5645_SYSTEM_CTRL0,
> + OV5645_SYSTEM_CTRL0_STOP);
> + }
> +
> + return 0;
> +}
<cut>
> +static int ov5645_probe(struct i2c_client *client,
> + const struct i2c_device_id *id)
> +{
> + struct device *dev = &client->dev;
> + struct device_node *endpoint;
> + struct ov5645 *ov5645;
> + int ret = 0;
no need to initialize
<cut>
> +
> + ov5645->io_regulator = devm_regulator_get(dev, "dovdd");
> + if (IS_ERR(ov5645->io_regulator)) {
> + switch(PTR_ERR(ov5645->io_regulator)) {
> + case -ENODEV:
> + /* Regulator is optional so this is ok - continue */
if the regulator is optional then use devm_regulator_get_optional, thus
you can avoid checking ov5645->io_regulator for NULL.
and the error handling will be simply
if (IS_ERR(ret_reg))
return PTR_ERR(ret_reg);
<cut>
> +
> + ov5645->pwdn_gpio = devm_gpiod_get(dev, "pwdn", GPIOD_OUT_LOW);
> + if (IS_ERR(ov5645->pwdn_gpio)) {
> + switch(PTR_ERR(ov5645->pwdn_gpio)) {
> + case -ENOENT:
> + /* GPIO is optional so this is ok - continue */
you can use devm_gpiod_get_optional then.
> + ov5645->pwdn_gpio = NULL;
> + dev_dbg(dev, "power down gpio not present\n");
> + break;
> + case -EPROBE_DEFER:
> + dev_dbg(dev, "power down gpio probe defered\n");
> + return -EPROBE_DEFER;
> + default:
> + dev_err(dev, "cannot get power down gpio\n");
> + return PTR_ERR(ov5645->pwdn_gpio);
> + }
> + }
--
regards,
Stan
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