linux-kernel - [PATCH v8 24/52] Input: atmel_mxt_ts - combine bootloader version query with probe

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Message-ID: <20200319150016.61398-25-jiada_wang@mentor.com>
Date:   Thu, 19 Mar 2020 07:59:48 -0700
From:   Jiada Wang <jiada_wang@...tor.com>
To:     <nick@...anahar.org>, <dmitry.torokhov@...il.com>,
        <jikos@...nel.org>, <benjamin.tissoires@...hat.com>,
        <bsz@...ihalf.com>, <rydberg@...math.org>
CC:     <linux-input@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <erosca@...adit-jv.com>, <Andrew_Gabbasov@...tor.com>,
        <jiada_wang@...tor.com>
Subject: [PATCH v8 24/52] Input: atmel_mxt_ts - combine bootloader version query with probe

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

This removes some complexity from the bootloader state machine, and means
that we always output some debug about the version as soon as we start
talking to the bootloader.

Signed-off-by: Nick Dyer <nick.dyer@...ev.co.uk>
(cherry picked from ndyer/linux/for-upstream commit a2d141f170c80fea6663af98aab0be32abc0ddb0)
Signed-off-by: George G. Davis <george_davis@...tor.com>
Signed-off-by: Jiada Wang <jiada_wang@...tor.com>
---
 drivers/input/touchscreen/atmel_mxt_ts.c | 45 +++++++-----------------
 1 file changed, 13 insertions(+), 32 deletions(-)

diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index b4d0835ba196..d3d6e4e60f67 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -558,47 +558,31 @@ static int mxt_probe_bootloader(struct mxt_data *data, bool alt_address)
 {
 	struct device *dev = &data->client->dev;
 	int error;
-	u8 val;
-	bool crc_failure;
+	u8 buf[3];
+	bool crc_failure, extended_id;
 
 	error = mxt_lookup_bootloader_address(data, alt_address);
 	if (error)
 		return error;
 
-	error = mxt_bootloader_read(data, &val, 1);
+	/* Check bootloader status and version information */
+	error = mxt_bootloader_read(data, buf, sizeof(buf));
 	if (error)
 		return error;
 
-	/* Check app crc fail mode */
-	crc_failure = (val & ~MXT_BOOT_STATUS_MASK) == MXT_APP_CRC_FAIL;
+	crc_failure = (buf[0] & ~MXT_BOOT_STATUS_MASK) == MXT_APP_CRC_FAIL;
+	extended_id = buf[0] & MXT_BOOT_EXTENDED_ID;
 
-	dev_err(dev, "Detected bootloader, status:%02X%s\n",
-			val, crc_failure ? ", APP_CRC_FAIL" : "");
+	dev_info(dev, "Found bootloader addr:%02x ID:%u%s%u%s\n",
+		 data->bootloader_addr,
+		 extended_id ? (buf[1] & MXT_BOOT_ID_MASK) : buf[0],
+		 extended_id ? " version:" : "",
+		 extended_id ? buf[2] : 0,
+		 crc_failure ? ", APP_CRC_FAIL" : "");
 
 	return 0;
 }
 
-static u8 mxt_get_bootloader_version(struct mxt_data *data, u8 val)
-{
-	struct device *dev = &data->client->dev;
-	u8 buf[3];
-
-	if (val & MXT_BOOT_EXTENDED_ID) {
-		if (mxt_bootloader_read(data, &buf[0], 3) != 0) {
-			dev_err(dev, "%s: i2c failure\n", __func__);
-			return val;
-		}
-
-		dev_dbg(dev, "Bootloader ID:%d Version:%d\n", buf[1], buf[2]);
-
-		return buf[0];
-	} else {
-		dev_dbg(dev, "Bootloader ID:%d\n", val & MXT_BOOT_ID_MASK);
-
-		return val;
-	}
-}
-
 static int mxt_check_bootloader(struct mxt_data *data, unsigned int state,
 				bool wait)
 {
@@ -632,9 +616,6 @@ static int mxt_check_bootloader(struct mxt_data *data, unsigned int state,
 	if (ret)
 		return ret;
 
-	if (state == MXT_WAITING_BOOTLOAD_CMD)
-		val = mxt_get_bootloader_version(data, val);
-
 	switch (state) {
 	case MXT_WAITING_BOOTLOAD_CMD:
 	case MXT_WAITING_FRAME_DATA:
@@ -3283,7 +3264,7 @@ static int mxt_enter_bootloader(struct mxt_data *data)
 		msleep(MXT_RESET_TIME);
 
 		/* Do not need to scan since we know family ID */
-		ret = mxt_lookup_bootloader_address(data, 0);
+		ret = mxt_probe_bootloader(data, 0);
 		if (ret)
 			return ret;
 
-- 
2.17.1