[PATCH v9 7/9] Input: goodix - add sysfs interface to dump config

Irina Tirdea
2015-10-12T15:25:22Z

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>
Tested-by: Bastien Nocera <hadess@hadess.net>
Tested-by: Aleksei Mamlin <mamlinav@gmail.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 a271df9..01a2634 100644
--- a/drivers/input/touchscreen/goodix.c
+++ b/drivers/input/touchscreen/goodix.c
@@ -508,12 +508,35 @@ 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