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    Subject[PATCH v5 8/9] Input: goodix - add sysfs interface to dump config
    Date
    Goodix devices have a configuration information register area that
    specify various parameters for the device. The configuration information
    has a specific format described in the Goodix datasheet. It includes X/Y
    resolution, maximum supported touch points, interrupt flags, various
    sesitivity factors and settings for advanced features (like gesture
    recognition).

    Export a sysfs interface that would allow reading the configuration
    information. The default device configuration can be used as a starting
    point for creating a valid configuration firmware used by the device at
    init time to update its configuration.

    This sysfs interface will be exported only if the gpio pins are properly
    initialized from ACPI/DT.

    Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
    ---
    drivers/input/touchscreen/goodix.c | 23 +++++++++++++++++++++++
    1 file changed, 23 insertions(+)

    diff --git a/drivers/input/touchscreen/goodix.c b/drivers/input/touchscreen/goodix.c
    index 33a7b81..3179767 100644
    --- a/drivers/input/touchscreen/goodix.c
    +++ b/drivers/input/touchscreen/goodix.c
    @@ -530,12 +530,35 @@ static ssize_t goodix_esd_timeout_store(struct device *dev,
    return count;
    }

    +static ssize_t goodix_dump_config_show(struct device *dev,
    + struct device_attribute *attr, char *buf)
    +{
    + struct goodix_ts_data *ts = dev_get_drvdata(dev);
    + u8 config[GOODIX_CONFIG_MAX_LENGTH];
    + int error, count = 0, i;
    +
    + error = goodix_i2c_read(ts->client, GOODIX_REG_CONFIG_DATA,
    + config, ts->cfg_len);
    + if (error) {
    + dev_warn(&ts->client->dev,
    + "Error reading config (%d)\n", error);
    + return error;
    + }
    +
    + for (i = 0; i < ts->cfg_len; i++)
    + count += scnprintf(buf + count, PAGE_SIZE - count, "%02x ",
    + config[i]);
    + return count;
    +}
    +
    /* ESD timeout in ms. Default disabled (0). Recommended 2000 ms. */
    static DEVICE_ATTR(esd_timeout, S_IRUGO | S_IWUSR, goodix_esd_timeout_show,
    goodix_esd_timeout_store);
    +static DEVICE_ATTR(dump_config, S_IRUGO, goodix_dump_config_show, NULL);

    static struct attribute *goodix_attrs[] = {
    &dev_attr_esd_timeout.attr,
    + &dev_attr_dump_config.attr,
    NULL
    };

    --
    1.9.1


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