linux-kernel - [PATCH 51/53] Input: atmel_mxt_ts - Allow specification of firmware file name

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Date:	Wed,  5 Jun 2013 18:37:44 +0100
From:	Nick Dyer <nick.dyer@...ev.co.uk>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Daniel Kurtz <djkurtz@...omium.org>,
	Henrik Rydberg <rydberg@...omail.se>,
	Joonyoung Shim <jy0922.shim@...sung.com>,
	Alan.Bowens@...el.com, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org, pmeerw@...erw.net,
	bleung@...omium.org, olofj@...omium.org
Cc:	Nick Dyer <nick.dyer@...ev.co.uk>
Subject: [PATCH 51/53] Input: atmel_mxt_ts - Allow specification of firmware file name

On platforms which have multiple device instances using this driver, the
firmware may be different on each device. This patch makes the user give the
name of the firmware file when flashing.

This also prevents accidental triggering of the firmware load process.

Signed-off-by: Nick Dyer <nick.dyer@...ev.co.uk>
Acked-by: Benson Leung <bleung@...omium.org>
---
 drivers/input/touchscreen/atmel_mxt_ts.c |   45 ++++++++++++++++++++++++++----
 1 file changed, 39 insertions(+), 6 deletions(-)

diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index 2b5d876..3a74371 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -27,8 +27,7 @@
 #include <linux/regulator/consumer.h>
 #include <linux/gpio.h>
 
-/* Firmware files */
-#define MXT_FW_NAME		"maxtouch.fw"
+/* Configuration file */
 #define MXT_CFG_NAME		"maxtouch.cfg"
 #define MXT_CFG_MAGIC		"OBP_RAW V1"
 
@@ -248,6 +247,7 @@ struct mxt_data {
 	bool use_regulator;
 	struct regulator *reg_vdd;
 	struct regulator *reg_avdd;
+	char *fw_name;
 
 	/* Cached parameters from object table */
 	u16 T5_address;
@@ -2369,7 +2369,7 @@ static int mxt_check_firmware_format(struct device *dev,
 	return -1;
 }
 
-static int mxt_load_fw(struct device *dev, const char *fn)
+static int mxt_load_fw(struct device *dev)
 {
 	struct mxt_data *data = dev_get_drvdata(dev);
 	const struct firmware *fw = NULL;
@@ -2379,9 +2379,9 @@ static int mxt_load_fw(struct device *dev, const char *fn)
 	unsigned int frame = 0;
 	int ret;
 
-	ret = request_firmware(&fw, fn, dev);
+	ret = request_firmware(&fw, data->fw_name, dev);
 	if (ret) {
-		dev_err(dev, "Unable to open firmware %s\n", fn);
+		dev_err(dev, "Unable to open firmware %s\n", data->fw_name);
 		return ret;
 	}
 
@@ -2496,6 +2496,35 @@ release_firmware:
 	return ret;
 }
 
+static int mxt_update_file_name(struct device *dev, char **file_name,
+				const char *buf, size_t count)
+{
+	char *file_name_tmp;
+
+	/* Simple sanity check */
+	if (count > 64) {
+		dev_warn(dev, "File name too long\n");
+		return -EINVAL;
+	}
+
+	file_name_tmp = krealloc(*file_name, count + 1, GFP_KERNEL);
+	if (!file_name_tmp) {
+		dev_warn(dev, "no memory\n");
+		return -ENOMEM;
+	}
+
+	*file_name = file_name_tmp;
+	memcpy(*file_name, buf, count);
+
+	/* Echo into the sysfs entry may append newline at the end of buf */
+	if (buf[count - 1] == '\n')
+		(*file_name)[count - 1] = '\0';
+	else
+		(*file_name)[count] = '\0';
+
+	return 0;
+}
+
 static ssize_t mxt_update_fw_store(struct device *dev,
 					struct device_attribute *attr,
 					const char *buf, size_t count)
@@ -2503,7 +2532,11 @@ static ssize_t mxt_update_fw_store(struct device *dev,
 	struct mxt_data *data = dev_get_drvdata(dev);
 	int error;
 
-	error = mxt_load_fw(dev, MXT_FW_NAME);
+	error = mxt_update_file_name(dev, &data->fw_name, buf, count);
+	if (error)
+		return error;
+
+	error = mxt_load_fw(dev);
 	if (error) {
 		dev_err(dev, "The firmware update failed(%d)\n", error);
 		count = error;
-- 
1.7.10.4

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