[PATCH v9 24/55] Input: atmel_mxt_ts - add config checksum attribute to sysfs

[Jiada Wang]

From: karl tsou <karl.funlab@xxxxxxxxx>

Add config checksum attribute to sysfs

Signed-off-by: karl tsou <karl.funlab@xxxxxxxxx>
Signed-off-by: Nick Dyer <nick.dyer@xxxxxxxxxxx>
(cherry picked from ndyer/linux/for-upstream commit 03477477ddbe5dcad42853ab3f84166a8f807acf)
[gdavis: Forward port and fix conflicts.]
Signed-off-by: George G. Davis <george_davis@xxxxxxxxxx>
[jiada: Add commit description
	Rename mxt_config_crc_show to config_crc_show
	Replace DEVICE_ATTR with DEVICE_ATTR_RO]
Signed-off-by: Jiada Wang <jiada_wang@xxxxxxxxxx>
---
 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 dfc20c0ca0a5..67931cf64629 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -3128,6 +3128,15 @@ static int mxt_configure_objects(struct mxt_data *data,
 	return error;
 }
 
+/* Configuration crc check sum is returned as hex xxxxxx */
+static ssize_t 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);
+}
+
 /* Firmware Version is returned as Major.Minor.Build */
 static ssize_t fw_version_show(struct device *dev,
 			       struct device_attribute *attr, char *buf)
@@ -3481,12 +3490,14 @@ static DEVICE_ATTR_RO(fw_version);
 static DEVICE_ATTR_RO(hw_version);
 static DEVICE_ATTR(object, S_IRUGO, mxt_object_show, NULL);
 static DEVICE_ATTR_WO(update_cfg);
+static DEVICE_ATTR_RO(config_crc);
 
 static struct attribute *mxt_attrs[] = {
 	&dev_attr_fw_version.attr,
 	&dev_attr_hw_version.attr,
 	&dev_attr_object.attr,
 	&dev_attr_update_cfg.attr,
+	&dev_attr_config_crc.attr,
 	NULL
 };
 
-- 
2.17.1