[PATCH v2 5/9] Input: iqs5xx - close bootloader using hardware reset

From: Jeff LaBundy <jeff@labundy.com>
To: dmitry.torokhov@gmail.com, robh+dt@kernel.org
Cc: linux-input@vger.kernel.org, devicetree@vger.kernel.org,
	Jeff LaBundy <jeff@labundy.com>
Subject: [PATCH v2 5/9] Input: iqs5xx - close bootloader using hardware reset
Date: Sat, 13 Mar 2021 13:12:32 -0600	[thread overview]
Message-ID: <20210313191236.4366-6-jeff@labundy.com> (raw)
In-Reply-To: <20210313191236.4366-1-jeff@labundy.com>

The bootloader can be closed using the 'execute' command (0x02) or
hardware reset. Rather than using the former option for successful
firmware update procedures and reserving the latter for recovering
the device upon failure, simply use hardware reset for all cases.

The post-bootloader initialization delay increases marginally when
triggered by a hardware reset, so increase the wait time to ensure
the device does not subsequently fail to respond.

As part of this change, refactor the return path to avoid an extra
assignment and to make the logic a bit smaller.

Signed-off-by: Jeff LaBundy <jeff@labundy.com>
---
Changes in v2:
 - None

 drivers/input/touchscreen/iqs5xx.c | 24 +++++++-----------------
 1 file changed, 7 insertions(+), 17 deletions(-)

diff --git a/drivers/input/touchscreen/iqs5xx.c b/drivers/input/touchscreen/iqs5xx.c
index 0920516124c7..a990c176abf7 100644
--- a/drivers/input/touchscreen/iqs5xx.c
+++ b/drivers/input/touchscreen/iqs5xx.c
@@ -832,7 +832,7 @@ static int iqs5xx_fw_file_parse(struct i2c_client *client,
 static int iqs5xx_fw_file_write(struct i2c_client *client, const char *fw_file)
 {
 	struct iqs5xx_private *iqs5xx = i2c_get_clientdata(client);
-	int error, error_bl = 0;
+	int error, error_init = 0;
 	u8 *pmap;

 	if (iqs5xx->dev_id_info.bl_status == IQS5XX_BL_STATUS_NONE)
@@ -875,21 +875,14 @@ static int iqs5xx_fw_file_write(struct i2c_client *client, const char *fw_file)
 	error = iqs5xx_bl_verify(client, IQS5XX_CSTM,
 				 pmap + IQS5XX_CHKSM_LEN + IQS5XX_APP_LEN,
 				 IQS5XX_CSTM_LEN);
-	if (error)
-		goto err_reset;
-
-	error = iqs5xx_bl_cmd(client, IQS5XX_BL_CMD_EXEC, 0);

 err_reset:
-	if (error) {
-		iqs5xx_reset(client);
-		usleep_range(10000, 10100);
-	}
+	iqs5xx_reset(client);
+	usleep_range(15000, 15100);

-	error_bl = error;
-	error = iqs5xx_dev_init(client);
-	if (!error && !iqs5xx->dev_id_info.bl_status)
-		error = -EINVAL;
+	error_init = iqs5xx_dev_init(client);
+	if (!iqs5xx->dev_id_info.bl_status)
+		error_init = error_init ? : -EINVAL;

 	enable_irq(client->irq);

@@ -898,10 +891,7 @@ static int iqs5xx_fw_file_write(struct i2c_client *client, const char *fw_file)
 err_kfree:
 	kfree(pmap);

-	if (error_bl)
-		return error_bl;
-
-	return error;
+	return error ? : error_init;
 }

 static ssize_t fw_file_store(struct device *dev,
--
2.17.1

