[2/2] Input: melfas_mip4 - add fw_name sysfs attribute

[Sangwon Jee <jeesw@melfas.com>]

To support user firmware file name, add fw_name sysfs attribute 
and modify to use fw_name variable instead of predefined value.

Signed-off-by: Sangwon Jee <jeesw@melfas.com>
---
 drivers/input/touchscreen/melfas_mip4.c | 46 +++++++++++++++++++++++++++++++--
 1 file changed, 44 insertions(+), 2 deletions(-)

diff --git a/drivers/input/touchscreen/melfas_mip4.c b/drivers/input/touchscreen/melfas_mip4.c
index 8739cb7..ae9c428 100644
--- a/drivers/input/touchscreen/melfas_mip4.c
+++ b/drivers/input/touchscreen/melfas_mip4.c
@@ -162,6 +162,7 @@ struct mip4_ts {
 	char product_name[16];
 	u16 product_id;
 	char ic_name[4];
+	char *fw_name;
 
 	unsigned int max_x;
 	unsigned int max_y;
@@ -1285,11 +1286,11 @@ static ssize_t mip4_sysfs_fw_update(struct device *dev,
 	const struct firmware *fw;
 	int error;
 
-	error = request_firmware(&fw, MIP4_FW_NAME, dev);
+	error = request_firmware(&fw, ts->fw_name, dev);
 	if (error) {
 		dev_err(&ts->client->dev,
 			"Failed to retrieve firmware %s: %d\n",
-			MIP4_FW_NAME, error);
+			ts->fw_name, error);
 		return error;
 	}
 
@@ -1403,11 +1404,51 @@ static ssize_t mip4_sysfs_read_ic_name(struct device *dev,
 
 static DEVICE_ATTR(ic_name, S_IRUGO, mip4_sysfs_read_ic_name, NULL);
 
+static ssize_t mip4_sysfs_read_fw_name(struct device *dev,
+					  struct device_attribute *attr,
+					  char *buf)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct mip4_ts *ts = i2c_get_clientdata(client);
+	size_t count;
+
+	mutex_lock(&ts->input->mutex);
+
+	count = snprintf(buf, PAGE_SIZE, "%s\n", ts->fw_name);
+
+	mutex_unlock(&ts->input->mutex);
+
+	return count;
+}
+
+static ssize_t mip4_sysfs_write_fw_name(struct device *dev,
+					struct device_attribute *attr,
+					const char *buf,
+					size_t count)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct mip4_ts *ts = i2c_get_clientdata(client);
+	char *filename;
+
+	filename = devm_kzalloc(dev, count - 1, GFP_KERNEL);
+	memcpy(filename, buf, count - 1);
+
+	ts->fw_name = devm_kstrdup(dev, filename, GFP_KERNEL);
+
+	devm_kfree(dev, filename);
+
+	return count;
+}
+
+static DEVICE_ATTR(fw_name, S_IRUGO | S_IWUSR,
+			mip4_sysfs_read_fw_name, mip4_sysfs_write_fw_name);
+
 static struct attribute *mip4_attrs[] = {
 	&dev_attr_fw_version.attr,
 	&dev_attr_hw_version.attr,
 	&dev_attr_product_id.attr,
 	&dev_attr_ic_name.attr,
+	&dev_attr_fw_name.attr,
 	&dev_attr_update_fw.attr,
 	NULL,
 };
@@ -1444,6 +1485,7 @@ static int mip4_probe(struct i2c_client *client, const struct i2c_device_id *id)
 
 	ts->client = client;
 	ts->input = input;
+	ts->fw_name = devm_kstrdup(&client->dev, MIP4_FW_NAME, GFP_KERNEL);
 
 	snprintf(ts->phys, sizeof(ts->phys),
 		 "%s/input0", dev_name(&client->dev));
-- 
1.9.1