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From:   Shawn Guo <shawn.guo@linaro.org>
To:     Nick Dyer <nick@shmanahar.org>,
        Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc:     Loic Poulain <loic.poulain@linaro.org>,
        linux-input@vger.kernel.org, linux-kernel@vger.kernel.org,
        Shawn Guo <shawn.guo@linaro.org>
Subject: [PATCH] Input: atmel_mxt_ts - add config_crc sysfs entry
Date:   Tue, 29 Jun 2021 10:30:23 +0800
Message-Id: <20210629023023.32017-1-shawn.guo@linaro.org>
Precedence: bulk

It's useful for checking the config version that is currently installed
on the device.

The code is taken from downstream maXTouch_linux tree.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
---
 drivers/input/touchscreen/atmel_mxt_ts.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index 05de92c0293b..41a3d4df3ebd 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -3002,16 +3002,27 @@ static ssize_t mxt_update_fw_store(struct device *dev,
 	return count;
 }
 
+/* Configuration crc check sum is returned as hex xxxxxx */
+static ssize_t mxt_config_crc_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct mxt_data *data = dev_get_drvdata(dev);
+
+	return scnprintf(buf, PAGE_SIZE, "%06x\n", data->config_crc);
+}
+
 static DEVICE_ATTR(fw_version, S_IRUGO, mxt_fw_version_show, NULL);
 static DEVICE_ATTR(hw_version, S_IRUGO, mxt_hw_version_show, NULL);
 static DEVICE_ATTR(object, S_IRUGO, mxt_object_show, NULL);
 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, mxt_update_fw_store);
+static DEVICE_ATTR(config_crc, S_IRUGO, mxt_config_crc_show, NULL);
 
 static struct attribute *mxt_attrs[] = {
 	&dev_attr_fw_version.attr,
 	&dev_attr_hw_version.attr,
 	&dev_attr_object.attr,
 	&dev_attr_update_fw.attr,
+	&dev_attr_config_crc.attr,
 	NULL
 };
 
-- 
2.17.1