linux-kernel - [PATCH v9 46/55] Input: Atmel: improve error handling in mxt

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Message-ID: <20200325133334.19346-47-jiada_wang@mentor.com>
Date:   Wed, 25 Mar 2020 06:33:25 -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 v9 46/55] Input: Atmel: improve error handling in mxt_initialize()

From: Deepak Das <deepak_das@...tor.com>

Currently mxt_initialize() tries to probe bootloader mode
even if valid bootloader address is not specified.

This commit modifies mxt_initialize() to return error
if Device is not in appmode and bootloader address is
not specified.

This commit also returns error code from mxt_send_bootloader_cmd()
in mxt_initialize().

Signed-off-by: Deepak Das <deepak_das@...tor.com>
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 | 58 +++++++++++++++++-------
 1 file changed, 41 insertions(+), 17 deletions(-)

diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index 0f7ee987a9c5..258dcd8a68e5 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -716,17 +716,13 @@ static int mxt_lookup_bootloader_address(struct mxt_data *data, bool retry)
 	return 0;
 }
 
-static int mxt_probe_bootloader(struct mxt_data *data, bool alt_address)
+static int mxt_probe_bootloader(struct mxt_data *data)
 {
 	struct device *dev = &data->client->dev;
 	int error;
 	u8 buf[3];
 	bool crc_failure, extended_id;
 
-	error = mxt_lookup_bootloader_address(data, alt_address);
-	if (error)
-		return error;
-
 	/* Check bootloader status and version information */
 	error = mxt_bootloader_read(data, buf, sizeof(buf));
 	if (error)
@@ -2922,6 +2918,32 @@ static void mxt_config_cb(const struct firmware *cfg, void *ctx)
 	release_firmware(cfg);
 }
 
+static int mxt_bootloader_status(struct mxt_data *data)
+{
+	struct i2c_client *client = data->client;
+	int error;
+
+	error = mxt_lookup_bootloader_address(data, false);
+	if (error) {
+		dev_info(&client->dev,
+			 "Bootloader address is not specified\n");
+		return error;
+	}
+	/* Check bootloader state */
+	error = mxt_probe_bootloader(data);
+	if (error) {
+		dev_info(&client->dev, "Trying alternate bootloader address\n");
+		mxt_lookup_bootloader_address(data, true);
+		error = mxt_probe_bootloader(data);
+		if (error) {
+			dev_err(&client->dev,
+				"Chip is not in appmode or bootloader mode\n");
+			return error;
+		}
+	}
+	return 0;
+}
+
 static int mxt_initialize(struct mxt_data *data)
 {
 	struct i2c_client *client = data->client;
@@ -2933,16 +2955,13 @@ static int mxt_initialize(struct mxt_data *data)
 		if (!error)
 			break;
 
-		/* Check bootloader state */
-		error = mxt_probe_bootloader(data, false);
-		if (error) {
-			dev_info(&client->dev, "Trying alternate bootloader address\n");
-			error = mxt_probe_bootloader(data, true);
-			if (error) {
-				/* Chip is not in appmode or bootloader mode */
-				return error;
-			}
-		}
+		dev_info(&client->dev,
+			 "info block read failed (%d), so try bootloader method\n",
+			 error);
+
+		error = mxt_bootloader_status(data);
+		if (error)
+			return error;
 
 		/* OK, we are in bootloader, see if we can recover */
 		if (++recovery_attempts > 1) {
@@ -2956,7 +2975,9 @@ static int mxt_initialize(struct mxt_data *data)
 		}
 
 		/* Attempt to exit bootloader into app mode */
-		mxt_send_bootloader_cmd(data, false);
+		error = mxt_send_bootloader_cmd(data, false);
+		if (error)
+			return error;
 		msleep(MXT_FW_RESET_TIME);
 	}
 
@@ -3648,8 +3669,11 @@ static int mxt_enter_bootloader(struct mxt_data *data)
 
 		msleep(MXT_RESET_TIME);
 
+		ret = mxt_lookup_bootloader_address(data, false);
+		if (ret)
+			return ret;
 		/* Do not need to scan since we know family ID */
-		ret = mxt_probe_bootloader(data, 0);
+		ret = mxt_probe_bootloader(data);
 		if (ret)
 			return ret;
 
-- 
2.17.1