[PATCH v2] i3c: master: Replace sprintf() with sysfs_emit() family

[PATCH v2] i3c: master: Replace sprintf() with sysfs_emit() family

[Maxwell Doose]

Replace sprintf() function calls with sysfs_emit() and
sysfs_emit_at() function calls where appropriate. This will help
harden the driver and help modernize it. While at it, add missing
newlines at the end of some sysfs_emit() (formerly sprintf()) calls.

Signed-off-by: Maxwell Doose <m32285159@gmail.com>
---
 v2:
 - Change commit message to use imperative voice as suggested by Frank
   Li.

 drivers/i3c/master.c | 26 +++++++++++++-------------
 1 file changed, 13 insertions(+), 13 deletions(-)

diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
index 9e6be49bebb2..c0d19eae06b9 100644
--- a/drivers/i3c/master.c
+++ b/drivers/i3c/master.c
@@ -174,7 +174,7 @@ static ssize_t bcr_show(struct device *dev,
 
 	i3c_bus_normaluse_lock(bus);
 	desc = dev_to_i3cdesc(dev);
-	ret = sprintf(buf, "0x%02x\n", desc->info.bcr);
+	ret = sysfs_emit(buf, "0x%02x\n", desc->info.bcr);
 	i3c_bus_normaluse_unlock(bus);
 
 	return ret;
@@ -191,7 +191,7 @@ static ssize_t dcr_show(struct device *dev,
 
 	i3c_bus_normaluse_lock(bus);
 	desc = dev_to_i3cdesc(dev);
-	ret = sprintf(buf, "0x%02x\n", desc->info.dcr);
+	ret = sysfs_emit(buf, "0x%02x\n", desc->info.dcr);
 	i3c_bus_normaluse_unlock(bus);
 
 	return ret;
@@ -208,7 +208,7 @@ static ssize_t pid_show(struct device *dev,
 
 	i3c_bus_normaluse_lock(bus);
 	desc = dev_to_i3cdesc(dev);
-	ret = sprintf(buf, "%llx\n", desc->info.pid);
+	ret = sysfs_emit(buf, "%llx\n", desc->info.pid);
 	i3c_bus_normaluse_unlock(bus);
 
 	return ret;
@@ -225,7 +225,7 @@ static ssize_t dynamic_address_show(struct device *dev,
 
 	i3c_bus_normaluse_lock(bus);
 	desc = dev_to_i3cdesc(dev);
-	ret = sprintf(buf, "%02x\n", desc->info.dyn_addr);
+	ret = sysfs_emit(buf, "%02x\n", desc->info.dyn_addr);
 	i3c_bus_normaluse_unlock(bus);
 
 	return ret;
@@ -256,7 +256,7 @@ static ssize_t hdrcap_show(struct device *dev,
 		if (!hdrcap_strings[mode])
 			continue;
 
-		ret = sprintf(buf + offset, offset ? " %s" : "%s",
+		ret = sysfs_emit_at(buf, offset, offset ? " %s" : "%s",
 			      hdrcap_strings[mode]);
 		if (ret < 0)
 			goto out;
@@ -264,7 +264,7 @@ static ssize_t hdrcap_show(struct device *dev,
 		offset += ret;
 	}
 
-	ret = sprintf(buf + offset, "\n");
+	ret = sysfs_emit_at(buf, offset, "\n");
 	if (ret < 0)
 		goto out;
 
@@ -290,10 +290,10 @@ static ssize_t modalias_show(struct device *dev,
 	ext = I3C_PID_EXTRA_INFO(devinfo.pid);
 
 	if (I3C_PID_RND_LOWER_32BITS(devinfo.pid))
-		return sprintf(buf, "i3c:dcr%02Xmanuf%04X", devinfo.dcr,
+		return sysfs_emit(buf, "i3c:dcr%02Xmanuf%04X\n", devinfo.dcr,
 			       manuf);
 
-	return sprintf(buf, "i3c:dcr%02Xmanuf%04Xpart%04Xext%04X",
+	return sysfs_emit(buf, "i3c:dcr%02Xmanuf%04Xpart%04Xext%04X\n",
 		       devinfo.dcr, manuf, part, ext);
 }
 static DEVICE_ATTR_RO(modalias);
@@ -578,9 +578,9 @@ static ssize_t mode_show(struct device *dev,
 	if (i3cbus->mode < 0 ||
 	    i3cbus->mode >= ARRAY_SIZE(i3c_bus_mode_strings) ||
 	    !i3c_bus_mode_strings[i3cbus->mode])
-		ret = sprintf(buf, "unknown\n");
+		ret = sysfs_emit(buf, "unknown\n");
 	else
-		ret = sprintf(buf, "%s\n", i3c_bus_mode_strings[i3cbus->mode]);
+		ret = sysfs_emit(buf, "%s\n", i3c_bus_mode_strings[i3cbus->mode]);
 	i3c_bus_normaluse_unlock(i3cbus);
 
 	return ret;
@@ -595,7 +595,7 @@ static ssize_t current_master_show(struct device *dev,
 	ssize_t ret;
 
 	i3c_bus_normaluse_lock(i3cbus);
-	ret = sprintf(buf, "%d-%llx\n", i3cbus->id,
+	ret = sysfs_emit(buf, "%d-%llx\n", i3cbus->id,
 		      i3cbus->cur_master->info.pid);
 	i3c_bus_normaluse_unlock(i3cbus);
 
@@ -611,7 +611,7 @@ static ssize_t i3c_scl_frequency_show(struct device *dev,
 	ssize_t ret;
 
 	i3c_bus_normaluse_lock(i3cbus);
-	ret = sprintf(buf, "%ld\n", i3cbus->scl_rate.i3c);
+	ret = sysfs_emit(buf, "%ld\n", i3cbus->scl_rate.i3c);
 	i3c_bus_normaluse_unlock(i3cbus);
 
 	return ret;
@@ -626,7 +626,7 @@ static ssize_t i2c_scl_frequency_show(struct device *dev,
 	ssize_t ret;
 
 	i3c_bus_normaluse_lock(i3cbus);
-	ret = sprintf(buf, "%ld\n", i3cbus->scl_rate.i2c);
+	ret = sysfs_emit(buf, "%ld\n", i3cbus->scl_rate.i2c);
 	i3c_bus_normaluse_unlock(i3cbus);
 
 	return ret;
-- 
2.53.0

Re: [PATCH v2] i3c: master: Replace sprintf() with sysfs_emit() family

[Frank Li]

On Tue, Apr 21, 2026 at 04:48:37PM -0500, Maxwell Doose wrote:
> Replace sprintf() function calls with sysfs_emit() and
> sysfs_emit_at() function calls where appropriate. This will help
> harden the driver and help modernize it. While at it, add missing
> newlines at the end of some sysfs_emit() (formerly sprintf()) calls.
>
> Signed-off-by: Maxwell Doose <m32285159@gmail.com>
> ---
Reviewed-by: Frank Li <Frank.Li@nxp.com>
>  v2:
>  - Change commit message to use imperative voice as suggested by Frank
>    Li.
>
>  drivers/i3c/master.c | 26 +++++++++++++-------------
>  1 file changed, 13 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
> index 9e6be49bebb2..c0d19eae06b9 100644
> --- a/drivers/i3c/master.c
> +++ b/drivers/i3c/master.c
> @@ -174,7 +174,7 @@ static ssize_t bcr_show(struct device *dev,
>
>  	i3c_bus_normaluse_lock(bus);
>  	desc = dev_to_i3cdesc(dev);
> -	ret = sprintf(buf, "0x%02x\n", desc->info.bcr);
> +	ret = sysfs_emit(buf, "0x%02x\n", desc->info.bcr);
>  	i3c_bus_normaluse_unlock(bus);
>
>  	return ret;
> @@ -191,7 +191,7 @@ static ssize_t dcr_show(struct device *dev,
>
>  	i3c_bus_normaluse_lock(bus);
>  	desc = dev_to_i3cdesc(dev);
> -	ret = sprintf(buf, "0x%02x\n", desc->info.dcr);
> +	ret = sysfs_emit(buf, "0x%02x\n", desc->info.dcr);
>  	i3c_bus_normaluse_unlock(bus);
>
>  	return ret;
> @@ -208,7 +208,7 @@ static ssize_t pid_show(struct device *dev,
>
>  	i3c_bus_normaluse_lock(bus);
>  	desc = dev_to_i3cdesc(dev);
> -	ret = sprintf(buf, "%llx\n", desc->info.pid);
> +	ret = sysfs_emit(buf, "%llx\n", desc->info.pid);
>  	i3c_bus_normaluse_unlock(bus);
>
>  	return ret;
> @@ -225,7 +225,7 @@ static ssize_t dynamic_address_show(struct device *dev,
>
>  	i3c_bus_normaluse_lock(bus);
>  	desc = dev_to_i3cdesc(dev);
> -	ret = sprintf(buf, "%02x\n", desc->info.dyn_addr);
> +	ret = sysfs_emit(buf, "%02x\n", desc->info.dyn_addr);
>  	i3c_bus_normaluse_unlock(bus);
>
>  	return ret;
> @@ -256,7 +256,7 @@ static ssize_t hdrcap_show(struct device *dev,
>  		if (!hdrcap_strings[mode])
>  			continue;
>
> -		ret = sprintf(buf + offset, offset ? " %s" : "%s",
> +		ret = sysfs_emit_at(buf, offset, offset ? " %s" : "%s",
>  			      hdrcap_strings[mode]);
>  		if (ret < 0)
>  			goto out;
> @@ -264,7 +264,7 @@ static ssize_t hdrcap_show(struct device *dev,
>  		offset += ret;
>  	}
>
> -	ret = sprintf(buf + offset, "\n");
> +	ret = sysfs_emit_at(buf, offset, "\n");
>  	if (ret < 0)
>  		goto out;
>
> @@ -290,10 +290,10 @@ static ssize_t modalias_show(struct device *dev,
>  	ext = I3C_PID_EXTRA_INFO(devinfo.pid);
>
>  	if (I3C_PID_RND_LOWER_32BITS(devinfo.pid))
> -		return sprintf(buf, "i3c:dcr%02Xmanuf%04X", devinfo.dcr,
> +		return sysfs_emit(buf, "i3c:dcr%02Xmanuf%04X\n", devinfo.dcr,
>  			       manuf);
>
> -	return sprintf(buf, "i3c:dcr%02Xmanuf%04Xpart%04Xext%04X",
> +	return sysfs_emit(buf, "i3c:dcr%02Xmanuf%04Xpart%04Xext%04X\n",
>  		       devinfo.dcr, manuf, part, ext);
>  }
>  static DEVICE_ATTR_RO(modalias);
> @@ -578,9 +578,9 @@ static ssize_t mode_show(struct device *dev,
>  	if (i3cbus->mode < 0 ||
>  	    i3cbus->mode >= ARRAY_SIZE(i3c_bus_mode_strings) ||
>  	    !i3c_bus_mode_strings[i3cbus->mode])
> -		ret = sprintf(buf, "unknown\n");
> +		ret = sysfs_emit(buf, "unknown\n");
>  	else
> -		ret = sprintf(buf, "%s\n", i3c_bus_mode_strings[i3cbus->mode]);
> +		ret = sysfs_emit(buf, "%s\n", i3c_bus_mode_strings[i3cbus->mode]);
>  	i3c_bus_normaluse_unlock(i3cbus);
>
>  	return ret;
> @@ -595,7 +595,7 @@ static ssize_t current_master_show(struct device *dev,
>  	ssize_t ret;
>
>  	i3c_bus_normaluse_lock(i3cbus);
> -	ret = sprintf(buf, "%d-%llx\n", i3cbus->id,
> +	ret = sysfs_emit(buf, "%d-%llx\n", i3cbus->id,
>  		      i3cbus->cur_master->info.pid);
>  	i3c_bus_normaluse_unlock(i3cbus);
>
> @@ -611,7 +611,7 @@ static ssize_t i3c_scl_frequency_show(struct device *dev,
>  	ssize_t ret;
>
>  	i3c_bus_normaluse_lock(i3cbus);
> -	ret = sprintf(buf, "%ld\n", i3cbus->scl_rate.i3c);
> +	ret = sysfs_emit(buf, "%ld\n", i3cbus->scl_rate.i3c);
>  	i3c_bus_normaluse_unlock(i3cbus);
>
>  	return ret;
> @@ -626,7 +626,7 @@ static ssize_t i2c_scl_frequency_show(struct device *dev,
>  	ssize_t ret;
>
>  	i3c_bus_normaluse_lock(i3cbus);
> -	ret = sprintf(buf, "%ld\n", i3cbus->scl_rate.i2c);
> +	ret = sysfs_emit(buf, "%ld\n", i3cbus->scl_rate.i2c);
>  	i3c_bus_normaluse_unlock(i3cbus);
>
>  	return ret;
> --
> 2.53.0
>
>
> --
> linux-i3c mailing list
> linux-i3c@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-i3c

Re: [PATCH v2] i3c: master: Replace sprintf() with sysfs_emit() family

[Alexandre Belloni]

On Tue, 21 Apr 2026 16:48:37 -0500, Maxwell Doose wrote:
> Replace sprintf() function calls with sysfs_emit() and
> sysfs_emit_at() function calls where appropriate. This will help
> harden the driver and help modernize it. While at it, add missing
> newlines at the end of some sysfs_emit() (formerly sprintf()) calls.

Applied, thanks!

[1/1] i3c: master: Replace sprintf() with sysfs_emit() family
      https://git.kernel.org/i3c/c/14236919b0e6

Best regards,

-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com