[PATCH v3 20/49] Input: atmel_mxt_ts - refactor firmware flash to extract context into struct

[Jiada Wang <jiada_wang@mentor.com>]

From: Nick Dyer <nick.dyer@itdev.co.uk>

Signed-off-by: Nick Dyer <nick.dyer@itdev.co.uk>
(cherry picked from ndyer/linux/for-upstream commit 1bbe20ff3dcd6612e7942c495929eae5c138ece2)
Signed-off-by: George G. Davis <george_davis@mentor.com>
Signed-off-by: Jiada Wang <jiada_wang@mentor.com>
---
 drivers/input/touchscreen/atmel_mxt_ts.c | 59 +++++++++++++++---------
 1 file changed, 36 insertions(+), 23 deletions(-)

diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index 69e34294688c..711ce39f38ca 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -291,6 +291,22 @@ struct mxt_cfg {
 	struct mxt_info info;
 };
 
+/* Firmware frame structure */
+struct mxt_fw_frame {
+	__be16 size;
+	u8 data[];
+};
+
+/* Firmware update context */
+struct mxt_flash {
+	const struct firmware *fw;
+	struct mxt_fw_frame *frame;
+	loff_t pos;
+	size_t frame_size;
+	unsigned int count;
+	unsigned int retry;
+};
+
 /* Each client has this additional data */
 struct mxt_data {
 	struct i2c_client *client;
@@ -3244,21 +3260,17 @@ static int mxt_check_firmware_format(struct device *dev,
 static int mxt_load_fw(struct device *dev)
 {
 	struct mxt_data *data = dev_get_drvdata(dev);
-	const struct firmware *fw = NULL;
-	unsigned int frame_size;
-	unsigned int pos = 0;
-	unsigned int retry = 0;
-	unsigned int frame = 0;
+	struct mxt_flash f = { 0, };
 	int ret;
 
-	ret = request_firmware(&fw, data->fw_name, dev);
+	ret = request_firmware(&f.fw, data->fw_name, dev);
 	if (ret) {
 		dev_err(dev, "Unable to open firmware %s\n", data->fw_name);
 		return ret;
 	}
 
 	/* Check for incorrect enc file */
-	ret = mxt_check_firmware_format(dev, fw);
+	ret = mxt_check_firmware_format(dev, f.fw);
 	if (ret)
 		goto release_firmware;
 
@@ -3312,41 +3324,42 @@ static int mxt_load_fw(struct device *dev)
 			goto disable_irq;
 	}
 
-	while (pos < fw->size) {
+	while (f.pos < f.fw->size) {
+		f.frame = (struct mxt_fw_frame *)(f.fw->data + f.pos);
+
 		ret = mxt_check_bootloader(data, MXT_WAITING_FRAME_DATA, true);
 		if (ret)
 			goto disable_irq;
 
-		frame_size = ((*(fw->data + pos) << 8) | *(fw->data + pos + 1));
-
 		/* Take account of CRC bytes */
-		frame_size += 2;
+		f.frame_size = __be16_to_cpu(f.frame->size) + 2U;
 
 		/* Write one frame to device */
-		ret = mxt_bootloader_write(data, fw->data + pos, frame_size);
+		ret = mxt_bootloader_write(data, f.fw->data + f.pos,
+					   f.frame_size);
 		if (ret)
 			goto disable_irq;
 
 		ret = mxt_check_bootloader(data, MXT_FRAME_CRC_PASS, true);
 		if (ret) {
-			retry++;
+			f.retry++;
 
 			/* Back off by 20ms per retry */
-			msleep(retry * 20);
+			msleep(f.retry * 20);
 
-			if (retry > 20) {
+			if (f.retry > 20) {
 				dev_err(dev, "Retry count exceeded\n");
 				goto disable_irq;
 			}
 		} else {
-			retry = 0;
-			pos += frame_size;
-			frame++;
+			f.retry = 0;
+			f.pos += f.frame_size;
+			f.count++;
 		}
 
-		if (frame % 50 == 0)
-			dev_dbg(dev, "Sent %d frames, %d/%zd bytes\n",
-				frame, pos, fw->size);
+		if (f.count % 50 == 0)
+			dev_dbg(dev, "Sent %u frames, %lld/%zu bytes\n",
+				f.count, f.pos, f.fw->size);
 	}
 
 	/* Wait for flash. */
@@ -3355,7 +3368,7 @@ static int mxt_load_fw(struct device *dev)
 	if (ret)
 		goto disable_irq;
 
-	dev_dbg(dev, "Sent %d frames, %d bytes\n", frame, pos);
+	dev_dbg(dev, "Sent %u frames, %lld bytes\n", f.count, f.pos);
 
 	/*
 	 * Wait for device to reset. Some bootloader versions do not assert
@@ -3369,7 +3382,7 @@ static int mxt_load_fw(struct device *dev)
 disable_irq:
 	disable_irq(data->irq);
 release_firmware:
-	release_firmware(fw);
+	release_firmware(f.fw);
 	return ret;
 }
 
-- 
2.19.2