[PATCH v4 1/4] HID: hid-picolcd*: Convert sprintf() family to sysfs_emit() family

[PATCH v4 1/4] HID: hid-picolcd*: Convert sprintf() family to sysfs_emit() family

[Li Zhijian]

Per filesystems/sysfs.rst, show() should only use sysfs_emit()
or sysfs_emit_at() when formatting the value to be returned to user space.

coccinelle complains that there are still a couple of functions that use
snprintf(). Convert them to sysfs_emit().

sprintf() and scnprintf() will be converted as well if they have.

Generally, this patch is generated by
make coccicheck M=<path/to/file> MODE=patch \
COCCI=scripts/coccinelle/api/device_attr_show.cocci

No functional change intended

CC: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
CC: "Bruno Prémont" <bonbons@linux-vserver.org>
CC: Jiri Kosina <jikos@kernel.org>
CC: Benjamin Tissoires <benjamin.tissoires@redhat.com>
CC: linux-input@vger.kernel.org
Signed-off-by: Li Zhijian <lizhijian@fujitsu.com>
---
V4:
   Kill 'if (ret >= PAGE_SIZE)' which is always false in this context and sysfs_emit_at() is able to handle this case. # CJ
V3:
   Convert more file(drivers/hid/hid-picolcd_fb.c) as suggested by Bruno

This is a part of the work "Fix coccicheck device_attr_show warnings"[1]
Split them per subsystem so that the maintainer can review it easily
[1] https://lore.kernel.org/lkml/20240116041129.3937800-1-lizhijian@fujitsu.com/
---
 drivers/hid/hid-picolcd_core.c | 6 +++---
 drivers/hid/hid-picolcd_fb.c   | 8 +++-----
 2 files changed, 6 insertions(+), 8 deletions(-)

diff --git a/drivers/hid/hid-picolcd_core.c b/drivers/hid/hid-picolcd_core.c
index bbda231a7ce3..fa46fb6eab3f 100644
--- a/drivers/hid/hid-picolcd_core.c
+++ b/drivers/hid/hid-picolcd_core.c
@@ -256,9 +256,9 @@ static ssize_t picolcd_operation_mode_show(struct device *dev,
 	struct picolcd_data *data = dev_get_drvdata(dev);
 
 	if (data->status & PICOLCD_BOOTLOADER)
-		return snprintf(buf, PAGE_SIZE, "[bootloader] lcd\n");
+		return sysfs_emit(buf, "[bootloader] lcd\n");
 	else
-		return snprintf(buf, PAGE_SIZE, "bootloader [lcd]\n");
+		return sysfs_emit(buf, "bootloader [lcd]\n");
 }
 
 static ssize_t picolcd_operation_mode_store(struct device *dev,
@@ -301,7 +301,7 @@ static ssize_t picolcd_operation_mode_delay_show(struct device *dev,
 {
 	struct picolcd_data *data = dev_get_drvdata(dev);
 
-	return snprintf(buf, PAGE_SIZE, "%hu\n", data->opmode_delay);
+	return sysfs_emit(buf, "%hu\n", data->opmode_delay);
 }
 
 static ssize_t picolcd_operation_mode_delay_store(struct device *dev,
diff --git a/drivers/hid/hid-picolcd_fb.c b/drivers/hid/hid-picolcd_fb.c
index d7dddd99d325..063f9c01d2f7 100644
--- a/drivers/hid/hid-picolcd_fb.c
+++ b/drivers/hid/hid-picolcd_fb.c
@@ -421,12 +421,10 @@ static ssize_t picolcd_fb_update_rate_show(struct device *dev,
 	size_t ret = 0;
 
 	for (i = 1; i <= PICOLCDFB_UPDATE_RATE_LIMIT; i++)
-		if (ret >= PAGE_SIZE)
-			break;
-		else if (i == fb_update_rate)
-			ret += scnprintf(buf+ret, PAGE_SIZE-ret, "[%u] ", i);
+		if (i == fb_update_rate)
+			ret += sysfs_emit_at(buf, ret, "[%u] ", i);
 		else
-			ret += scnprintf(buf+ret, PAGE_SIZE-ret, "%u ", i);
+			ret += sysfs_emit_at(buf, ret, "%u ", i);
 	if (ret > 0)
 		buf[min(ret, (size_t)PAGE_SIZE)-1] = '\n';
 	return ret;
-- 
2.29.2

[PATCH v4 2/4] HID: hid-sensor-custom: Convert sprintf() family to sysfs_emit() family

[Li Zhijian]

Per filesystems/sysfs.rst, show() should only use sysfs_emit()
or sysfs_emit_at() when formatting the value to be returned to user space.

coccinelle complains that there are still a couple of functions that use
snprintf(). Convert them to sysfs_emit().

sprintf() and scnprintf() will be converted as well if they have.

Generally, this patch is generated by
make coccicheck M=<path/to/file> MODE=patch \
COCCI=scripts/coccinelle/api/device_attr_show.cocci

No functional change intended

CC: Jiri Kosina <jikos@kernel.org>
CC: Jonathan Cameron <jic23@kernel.org>
CC: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
CC: Benjamin Tissoires <benjamin.tissoires@redhat.com>
CC: linux-input@vger.kernel.org
CC: linux-iio@vger.kernel.org
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Li Zhijian <lizhijian@fujitsu.com>
---
V3:
   rewrap the line as will be under 80 chars and add Reviewed-by # Jonathan
This is a part of the work "Fix coccicheck device_attr_show warnings"[1]
Split them per subsystem so that the maintainer can review it easily
[1] https://lore.kernel.org/lkml/20240116041129.3937800-1-lizhijian@fujitsu.com/
---
 drivers/hid/hid-sensor-custom.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/hid/hid-sensor-custom.c b/drivers/hid/hid-sensor-custom.c
index d85398721659..ac214777d7d9 100644
--- a/drivers/hid/hid-sensor-custom.c
+++ b/drivers/hid/hid-sensor-custom.c
@@ -155,7 +155,7 @@ static ssize_t enable_sensor_show(struct device *dev,
 {
 	struct hid_sensor_custom *sensor_inst = dev_get_drvdata(dev);
 
-	return sprintf(buf, "%d\n", sensor_inst->enable);
+	return sysfs_emit(buf, "%d\n", sensor_inst->enable);
 }
 
 static int set_power_report_state(struct hid_sensor_custom *sensor_inst,
@@ -372,14 +372,13 @@ static ssize_t show_value(struct device *dev, struct device_attribute *attr,
 				     sizeof(struct hid_custom_usage_desc),
 				     usage_id_cmp);
 		if (usage_desc)
-			return snprintf(buf, PAGE_SIZE, "%s\n",
-					usage_desc->desc);
+			return sysfs_emit(buf, "%s\n", usage_desc->desc);
 		else
-			return sprintf(buf, "not-specified\n");
+			return sysfs_emit(buf, "not-specified\n");
 	 } else
 		return -EINVAL;
 
-	return sprintf(buf, "%d\n", value);
+	return sysfs_emit(buf, "%d\n", value);
 }
 
 static ssize_t store_value(struct device *dev, struct device_attribute *attr,
-- 
2.29.2

Re: [PATCH v4 2/4] HID: hid-sensor-custom: Convert sprintf() family to sysfs_emit() family

[Jonathan Cameron]

On Tue, 19 Mar 2024 13:45:25 +0800
Li Zhijian <lizhijian@fujitsu.com> wrote:

> Per filesystems/sysfs.rst, show() should only use sysfs_emit()
> or sysfs_emit_at() when formatting the value to be returned to user space.
> 
> coccinelle complains that there are still a couple of functions that use
> snprintf(). Convert them to sysfs_emit().
> 
> sprintf() and scnprintf() will be converted as well if they have.
> 
> Generally, this patch is generated by
> make coccicheck M=<path/to/file> MODE=patch \
> COCCI=scripts/coccinelle/api/device_attr_show.cocci
> 
> No functional change intended
> 
> CC: Jiri Kosina <jikos@kernel.org>
> CC: Jonathan Cameron <jic23@kernel.org>
> CC: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
> CC: Benjamin Tissoires <benjamin.tissoires@redhat.com>
> CC: linux-input@vger.kernel.org
> CC: linux-iio@vger.kernel.org

As a general rule, don't have cc's of lists up here. It makes
a mess of the logs. Also once you have another tag drop CC of
same person (even if it's a different email address).

We don't want to fill the git log with useless information.

I think git is fine picking up CC's from below the --- so you
can add them there if it simplifies how you send your patch
sets out.


> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> Signed-off-by: Li Zhijian <lizhijian@fujitsu.com>
> ---
> V3:
>    rewrap the line as will be under 80 chars and add Reviewed-by # Jonathan
> This is a part of the work "Fix coccicheck device_attr_show warnings"[1]
> Split them per subsystem so that the maintainer can review it easily
> [1] https://lore.kernel.org/lkml/20240116041129.3937800-1-lizhijian@fujitsu.com/
> ---
>  drivers/hid/hid-sensor-custom.c | 9 ++++-----
>  1 file changed, 4 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/hid/hid-sensor-custom.c b/drivers/hid/hid-sensor-custom.c
> index d85398721659..ac214777d7d9 100644
> --- a/drivers/hid/hid-sensor-custom.c
> +++ b/drivers/hid/hid-sensor-custom.c
> @@ -155,7 +155,7 @@ static ssize_t enable_sensor_show(struct device *dev,
>  {
>  	struct hid_sensor_custom *sensor_inst = dev_get_drvdata(dev);
>  
> -	return sprintf(buf, "%d\n", sensor_inst->enable);
> +	return sysfs_emit(buf, "%d\n", sensor_inst->enable);
>  }
>  
>  static int set_power_report_state(struct hid_sensor_custom *sensor_inst,
> @@ -372,14 +372,13 @@ static ssize_t show_value(struct device *dev, struct device_attribute *attr,
>  				     sizeof(struct hid_custom_usage_desc),
>  				     usage_id_cmp);
>  		if (usage_desc)
> -			return snprintf(buf, PAGE_SIZE, "%s\n",
> -					usage_desc->desc);
> +			return sysfs_emit(buf, "%s\n", usage_desc->desc);
>  		else
> -			return sprintf(buf, "not-specified\n");
> +			return sysfs_emit(buf, "not-specified\n");
>  	 } else
>  		return -EINVAL;
>  
> -	return sprintf(buf, "%d\n", value);
> +	return sysfs_emit(buf, "%d\n", value);
>  }
>  
>  static ssize_t store_value(struct device *dev, struct device_attribute *attr,

Re: [PATCH v4 2/4] HID: hid-sensor-custom: Convert sprintf() family to sysfs_emit() family

[Zhijian Li (Fujitsu)]

On 24/03/2024 20:16, Jonathan Cameron wrote:
> On Tue, 19 Mar 2024 13:45:25 +0800
> Li Zhijian <lizhijian@fujitsu.com> wrote:
> 
>> Per filesystems/sysfs.rst, show() should only use sysfs_emit()
>> or sysfs_emit_at() when formatting the value to be returned to user space.
>>
>> coccinelle complains that there are still a couple of functions that use
>> snprintf(). Convert them to sysfs_emit().
>>
>> sprintf() and scnprintf() will be converted as well if they have.
>>
>> Generally, this patch is generated by
>> make coccicheck M=<path/to/file> MODE=patch \
>> COCCI=scripts/coccinelle/api/device_attr_show.cocci
>>
>> No functional change intended
>>
>> CC: Jiri Kosina <jikos@kernel.org>
>> CC: Jonathan Cameron <jic23@kernel.org>
>> CC: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
>> CC: Benjamin Tissoires <benjamin.tissoires@redhat.com>
>> CC: linux-input@vger.kernel.org
>> CC: linux-iio@vger.kernel.org
> 
> As a general rule, don't have cc's of lists up here. It makes
> a mess of the logs. Also once you have another tag drop CC of
> same person (even if it's a different email address).
> 

Thank you Jonathan.

Understood!

> We don't want to fill the git log with useless information.
> 
> I think git is fine picking up CC's from below the --- so you
> can add them there if it simplifies how you send your patch
> sets out.

Great, it sounds good to me.


Thanks
Zhijian


> 
> 
>> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
>> Signed-off-by: Li Zhijian <lizhijian@fujitsu.com>
>> ---
>> V3:
>>     rewrap the line as will be under 80 chars and add Reviewed-by # Jonathan
>> This is a part of the work "Fix coccicheck device_attr_show warnings"[1]
>> Split them per subsystem so that the maintainer can review it easily
>> [1] https://lore.kernel.org/lkml/20240116041129.3937800-1-lizhijian@fujitsu.com/
>> ---
>>   drivers/hid/hid-sensor-custom.c | 9 ++++-----
>>   1 file changed, 4 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/hid/hid-sensor-custom.c b/drivers/hid/hid-sensor-custom.c
>> index d85398721659..ac214777d7d9 100644
>> --- a/drivers/hid/hid-sensor-custom.c
>> +++ b/drivers/hid/hid-sensor-custom.c
>> @@ -155,7 +155,7 @@ static ssize_t enable_sensor_show(struct device *dev,
>>   {
>>   	struct hid_sensor_custom *sensor_inst = dev_get_drvdata(dev);
>>   
>> -	return sprintf(buf, "%d\n", sensor_inst->enable);
>> +	return sysfs_emit(buf, "%d\n", sensor_inst->enable);
>>   }
>>   
>>   static int set_power_report_state(struct hid_sensor_custom *sensor_inst,
>> @@ -372,14 +372,13 @@ static ssize_t show_value(struct device *dev, struct device_attribute *attr,
>>   				     sizeof(struct hid_custom_usage_desc),
>>   				     usage_id_cmp);
>>   		if (usage_desc)
>> -			return snprintf(buf, PAGE_SIZE, "%s\n",
>> -					usage_desc->desc);
>> +			return sysfs_emit(buf, "%s\n", usage_desc->desc);
>>   		else
>> -			return sprintf(buf, "not-specified\n");
>> +			return sysfs_emit(buf, "not-specified\n");
>>   	 } else
>>   		return -EINVAL;
>>   
>> -	return sprintf(buf, "%d\n", value);
>> +	return sysfs_emit(buf, "%d\n", value);
>>   }
>>   
>>   static ssize_t store_value(struct device *dev, struct device_attribute *attr,
> 

[PATCH v4 3/4] HID: roccat: Convert sprintf() family to sysfs_emit() family

[Li Zhijian]

Per filesystems/sysfs.rst, show() should only use sysfs_emit()
or sysfs_emit_at() when formatting the value to be returned to user space.

coccinelle complains that there are still a couple of functions that use
snprintf(). Convert them to sysfs_emit().

sprintf() and scnprintf() will be converted as well if they have.

Generally, this patch is generated by
make coccicheck M=<path/to/file> MODE=patch \
COCCI=scripts/coccinelle/api/device_attr_show.cocci

No functional change intended

CC: Stefan Achatz <erazor_de@users.sourceforge.net>
CC: Jiri Kosina <jikos@kernel.org>
CC: Benjamin Tissoires <benjamin.tissoires@redhat.com>
CC: linux-input@vger.kernel.org
Signed-off-by: Li Zhijian <lizhijian@fujitsu.com>
---
This is a part of the work "Fix coccicheck device_attr_show warnings"[1]
Split them per subsystem so that the maintainer can review it easily
[1] https://lore.kernel.org/lkml/20240116041129.3937800-1-lizhijian@fujitsu.com/
---
 drivers/hid/hid-roccat-isku.c     |  2 +-
 drivers/hid/hid-roccat-kone.c     | 12 ++++++------
 drivers/hid/hid-roccat-koneplus.c |  4 ++--
 drivers/hid/hid-roccat-kovaplus.c | 10 +++++-----
 drivers/hid/hid-roccat-pyra.c     |  6 +++---
 5 files changed, 17 insertions(+), 17 deletions(-)

diff --git a/drivers/hid/hid-roccat-isku.c b/drivers/hid/hid-roccat-isku.c
index 458060403397..0cd6208fb371 100644
--- a/drivers/hid/hid-roccat-isku.c
+++ b/drivers/hid/hid-roccat-isku.c
@@ -61,7 +61,7 @@ static ssize_t isku_sysfs_show_actual_profile(struct device *dev,
 {
 	struct isku_device *isku =
 			hid_get_drvdata(dev_get_drvdata(dev->parent->parent));
-	return snprintf(buf, PAGE_SIZE, "%d\n", isku->actual_profile);
+	return sysfs_emit(buf, "%d\n", isku->actual_profile);
 }
 
 static ssize_t isku_sysfs_set_actual_profile(struct device *dev,
diff --git a/drivers/hid/hid-roccat-kone.c b/drivers/hid/hid-roccat-kone.c
index 00a1abc7e839..3f8f459edcf3 100644
--- a/drivers/hid/hid-roccat-kone.c
+++ b/drivers/hid/hid-roccat-kone.c
@@ -400,7 +400,7 @@ static ssize_t kone_sysfs_show_actual_profile(struct device *dev,
 {
 	struct kone_device *kone =
 			hid_get_drvdata(dev_get_drvdata(dev->parent->parent));
-	return snprintf(buf, PAGE_SIZE, "%d\n", kone->actual_profile);
+	return sysfs_emit(buf, "%d\n", kone->actual_profile);
 }
 static DEVICE_ATTR(actual_profile, 0440, kone_sysfs_show_actual_profile, NULL);
 
@@ -409,7 +409,7 @@ static ssize_t kone_sysfs_show_actual_dpi(struct device *dev,
 {
 	struct kone_device *kone =
 			hid_get_drvdata(dev_get_drvdata(dev->parent->parent));
-	return snprintf(buf, PAGE_SIZE, "%d\n", kone->actual_dpi);
+	return sysfs_emit(buf, "%d\n", kone->actual_dpi);
 }
 static DEVICE_ATTR(actual_dpi, 0440, kone_sysfs_show_actual_dpi, NULL);
 
@@ -432,7 +432,7 @@ static ssize_t kone_sysfs_show_weight(struct device *dev,
 
 	if (retval)
 		return retval;
-	return snprintf(buf, PAGE_SIZE, "%d\n", weight);
+	return sysfs_emit(buf, "%d\n", weight);
 }
 static DEVICE_ATTR(weight, 0440, kone_sysfs_show_weight, NULL);
 
@@ -441,7 +441,7 @@ static ssize_t kone_sysfs_show_firmware_version(struct device *dev,
 {
 	struct kone_device *kone =
 			hid_get_drvdata(dev_get_drvdata(dev->parent->parent));
-	return snprintf(buf, PAGE_SIZE, "%d\n", kone->firmware_version);
+	return sysfs_emit(buf, "%d\n", kone->firmware_version);
 }
 static DEVICE_ATTR(firmware_version, 0440, kone_sysfs_show_firmware_version,
 		   NULL);
@@ -451,7 +451,7 @@ static ssize_t kone_sysfs_show_tcu(struct device *dev,
 {
 	struct kone_device *kone =
 			hid_get_drvdata(dev_get_drvdata(dev->parent->parent));
-	return snprintf(buf, PAGE_SIZE, "%d\n", kone->settings.tcu);
+	return sysfs_emit(buf, "%d\n", kone->settings.tcu);
 }
 
 static int kone_tcu_command(struct usb_device *usb_dev, int number)
@@ -553,7 +553,7 @@ static ssize_t kone_sysfs_show_startup_profile(struct device *dev,
 {
 	struct kone_device *kone =
 			hid_get_drvdata(dev_get_drvdata(dev->parent->parent));
-	return snprintf(buf, PAGE_SIZE, "%d\n", kone->settings.startup_profile);
+	return sysfs_emit(buf, "%d\n", kone->settings.startup_profile);
 }
 
 static ssize_t kone_sysfs_set_startup_profile(struct device *dev,
diff --git a/drivers/hid/hid-roccat-koneplus.c b/drivers/hid/hid-roccat-koneplus.c
index 22b895436a7c..8ccb3b14a1a9 100644
--- a/drivers/hid/hid-roccat-koneplus.c
+++ b/drivers/hid/hid-roccat-koneplus.c
@@ -242,7 +242,7 @@ static ssize_t koneplus_sysfs_show_actual_profile(struct device *dev,
 {
 	struct koneplus_device *koneplus =
 			hid_get_drvdata(dev_get_drvdata(dev->parent->parent));
-	return snprintf(buf, PAGE_SIZE, "%d\n", koneplus->actual_profile);
+	return sysfs_emit(buf, "%d\n", koneplus->actual_profile);
 }
 
 static ssize_t koneplus_sysfs_set_actual_profile(struct device *dev,
@@ -309,7 +309,7 @@ static ssize_t koneplus_sysfs_show_firmware_version(struct device *dev,
 			&info, KONEPLUS_SIZE_INFO);
 	mutex_unlock(&koneplus->koneplus_lock);
 
-	return snprintf(buf, PAGE_SIZE, "%d\n", info.firmware_version);
+	return sysfs_emit(buf, "%d\n", info.firmware_version);
 }
 static DEVICE_ATTR(firmware_version, 0440,
 		   koneplus_sysfs_show_firmware_version, NULL);
diff --git a/drivers/hid/hid-roccat-kovaplus.c b/drivers/hid/hid-roccat-kovaplus.c
index 86af538c10d6..748d4d7cb2fc 100644
--- a/drivers/hid/hid-roccat-kovaplus.c
+++ b/drivers/hid/hid-roccat-kovaplus.c
@@ -272,7 +272,7 @@ static ssize_t kovaplus_sysfs_show_actual_profile(struct device *dev,
 {
 	struct kovaplus_device *kovaplus =
 			hid_get_drvdata(dev_get_drvdata(dev->parent->parent));
-	return snprintf(buf, PAGE_SIZE, "%d\n", kovaplus->actual_profile);
+	return sysfs_emit(buf, "%d\n", kovaplus->actual_profile);
 }
 
 static ssize_t kovaplus_sysfs_set_actual_profile(struct device *dev,
@@ -325,7 +325,7 @@ static ssize_t kovaplus_sysfs_show_actual_cpi(struct device *dev,
 {
 	struct kovaplus_device *kovaplus =
 			hid_get_drvdata(dev_get_drvdata(dev->parent->parent));
-	return snprintf(buf, PAGE_SIZE, "%d\n", kovaplus->actual_cpi);
+	return sysfs_emit(buf, "%d\n", kovaplus->actual_cpi);
 }
 static DEVICE_ATTR(actual_cpi, 0440, kovaplus_sysfs_show_actual_cpi, NULL);
 
@@ -334,7 +334,7 @@ static ssize_t kovaplus_sysfs_show_actual_sensitivity_x(struct device *dev,
 {
 	struct kovaplus_device *kovaplus =
 			hid_get_drvdata(dev_get_drvdata(dev->parent->parent));
-	return snprintf(buf, PAGE_SIZE, "%d\n", kovaplus->actual_x_sensitivity);
+	return sysfs_emit(buf, "%d\n", kovaplus->actual_x_sensitivity);
 }
 static DEVICE_ATTR(actual_sensitivity_x, 0440,
 		   kovaplus_sysfs_show_actual_sensitivity_x, NULL);
@@ -344,7 +344,7 @@ static ssize_t kovaplus_sysfs_show_actual_sensitivity_y(struct device *dev,
 {
 	struct kovaplus_device *kovaplus =
 			hid_get_drvdata(dev_get_drvdata(dev->parent->parent));
-	return snprintf(buf, PAGE_SIZE, "%d\n", kovaplus->actual_y_sensitivity);
+	return sysfs_emit(buf, "%d\n", kovaplus->actual_y_sensitivity);
 }
 static DEVICE_ATTR(actual_sensitivity_y, 0440,
 		   kovaplus_sysfs_show_actual_sensitivity_y, NULL);
@@ -365,7 +365,7 @@ static ssize_t kovaplus_sysfs_show_firmware_version(struct device *dev,
 			&info, KOVAPLUS_SIZE_INFO);
 	mutex_unlock(&kovaplus->kovaplus_lock);
 
-	return snprintf(buf, PAGE_SIZE, "%d\n", info.firmware_version);
+	return sysfs_emit(buf, "%d\n", info.firmware_version);
 }
 static DEVICE_ATTR(firmware_version, 0440,
 		   kovaplus_sysfs_show_firmware_version, NULL);
diff --git a/drivers/hid/hid-roccat-pyra.c b/drivers/hid/hid-roccat-pyra.c
index 5663b9cd9c69..eeb3d38cd805 100644
--- a/drivers/hid/hid-roccat-pyra.c
+++ b/drivers/hid/hid-roccat-pyra.c
@@ -283,7 +283,7 @@ static ssize_t pyra_sysfs_show_actual_cpi(struct device *dev,
 {
 	struct pyra_device *pyra =
 			hid_get_drvdata(dev_get_drvdata(dev->parent->parent));
-	return snprintf(buf, PAGE_SIZE, "%d\n", pyra->actual_cpi);
+	return sysfs_emit(buf, "%d\n", pyra->actual_cpi);
 }
 static DEVICE_ATTR(actual_cpi, 0440, pyra_sysfs_show_actual_cpi, NULL);
 
@@ -300,7 +300,7 @@ static ssize_t pyra_sysfs_show_actual_profile(struct device *dev,
 			&settings, PYRA_SIZE_SETTINGS);
 	mutex_unlock(&pyra->pyra_lock);
 
-	return snprintf(buf, PAGE_SIZE, "%d\n", settings.startup_profile);
+	return sysfs_emit(buf, "%d\n", settings.startup_profile);
 }
 static DEVICE_ATTR(actual_profile, 0440, pyra_sysfs_show_actual_profile, NULL);
 static DEVICE_ATTR(startup_profile, 0440, pyra_sysfs_show_actual_profile, NULL);
@@ -321,7 +321,7 @@ static ssize_t pyra_sysfs_show_firmware_version(struct device *dev,
 			&info, PYRA_SIZE_INFO);
 	mutex_unlock(&pyra->pyra_lock);
 
-	return snprintf(buf, PAGE_SIZE, "%d\n", info.firmware_version);
+	return sysfs_emit(buf, "%d\n", info.firmware_version);
 }
 static DEVICE_ATTR(firmware_version, 0440, pyra_sysfs_show_firmware_version,
 		   NULL);
-- 
2.29.2

[PATCH v4 4/4] HID: corsair,lenovo: Convert sprintf() family to sysfs_emit() family

[Li Zhijian]

Per filesystems/sysfs.rst, show() should only use sysfs_emit()
or sysfs_emit_at() when formatting the value to be returned to user space.

coccinelle complains that there are still a couple of functions that use
snprintf(). Convert them to sysfs_emit().

sprintf() and scnprintf() will be converted as well if they have.

Generally, this patch is generated by
make coccicheck M=<path/to/file> MODE=patch \
COCCI=scripts/coccinelle/api/device_attr_show.cocci

No functional change intended

CC: Jiri Kosina <jikos@kernel.org>
CC: Benjamin Tissoires <benjamin.tissoires@redhat.com>
CC: linux-input@vger.kernel.org
Signed-off-by: Li Zhijian <lizhijian@fujitsu.com>
---
This is a part of the work "Fix coccicheck device_attr_show warnings"[1]
Split them per subsystem so that the maintainer can review it easily
[1] https://lore.kernel.org/lkml/20240116041129.3937800-1-lizhijian@fujitsu.com/
---
 drivers/hid/hid-corsair.c |  4 ++--
 drivers/hid/hid-lenovo.c  | 23 ++++++++++-------------
 2 files changed, 12 insertions(+), 15 deletions(-)

diff --git a/drivers/hid/hid-corsair.c b/drivers/hid/hid-corsair.c
index 8c895c820b67..702f50e9841d 100644
--- a/drivers/hid/hid-corsair.c
+++ b/drivers/hid/hid-corsair.c
@@ -298,7 +298,7 @@ static ssize_t k90_show_macro_mode(struct device *dev,
 		goto out;
 	}
 
-	ret = snprintf(buf, PAGE_SIZE, "%s\n", macro_mode);
+	ret = sysfs_emit(buf, "%s\n", macro_mode);
 out:
 	kfree(data);
 
@@ -367,7 +367,7 @@ static ssize_t k90_show_current_profile(struct device *dev,
 		goto out;
 	}
 
-	ret = snprintf(buf, PAGE_SIZE, "%d\n", current_profile);
+	ret = sysfs_emit(buf, "%d\n", current_profile);
 out:
 	kfree(data);
 
diff --git a/drivers/hid/hid-lenovo.c b/drivers/hid/hid-lenovo.c
index f86c1ea83a03..e6b2ae68b8fb 100644
--- a/drivers/hid/hid-lenovo.c
+++ b/drivers/hid/hid-lenovo.c
@@ -555,7 +555,7 @@ static ssize_t attr_fn_lock_show(struct device *dev,
 	struct hid_device *hdev = to_hid_device(dev);
 	struct lenovo_drvdata *data = hid_get_drvdata(hdev);
 
-	return snprintf(buf, PAGE_SIZE, "%u\n", data->fn_lock);
+	return sysfs_emit(buf, "%u\n", data->fn_lock);
 }
 
 static ssize_t attr_fn_lock_store(struct device *dev,
@@ -599,8 +599,7 @@ static ssize_t attr_sensitivity_show_cptkbd(struct device *dev,
 	struct hid_device *hdev = to_hid_device(dev);
 	struct lenovo_drvdata *cptkbd_data = hid_get_drvdata(hdev);
 
-	return snprintf(buf, PAGE_SIZE, "%u\n",
-		cptkbd_data->sensitivity);
+	return sysfs_emit(buf, "%u\n", cptkbd_data->sensitivity);
 }
 
 static ssize_t attr_sensitivity_store_cptkbd(struct device *dev,
@@ -628,8 +627,8 @@ static ssize_t attr_middleclick_workaround_show_cptkbd(struct device *dev,
 	struct hid_device *hdev = to_hid_device(dev);
 	struct lenovo_drvdata *cptkbd_data = hid_get_drvdata(hdev);
 
-	return snprintf(buf, PAGE_SIZE, "%u\n",
-		cptkbd_data->middleclick_workaround_cptkbd);
+	return sysfs_emit(buf, "%u\n",
+			  cptkbd_data->middleclick_workaround_cptkbd);
 }
 
 static ssize_t attr_middleclick_workaround_store_cptkbd(struct device *dev,
@@ -809,7 +808,7 @@ static ssize_t attr_press_to_select_show_tpkbd(struct device *dev,
 	struct hid_device *hdev = to_hid_device(dev);
 	struct lenovo_drvdata *data_pointer = hid_get_drvdata(hdev);
 
-	return snprintf(buf, PAGE_SIZE, "%u\n", data_pointer->press_to_select);
+	return sysfs_emit(buf, "%u\n", data_pointer->press_to_select);
 }
 
 static ssize_t attr_press_to_select_store_tpkbd(struct device *dev,
@@ -839,7 +838,7 @@ static ssize_t attr_dragging_show_tpkbd(struct device *dev,
 	struct hid_device *hdev = to_hid_device(dev);
 	struct lenovo_drvdata *data_pointer = hid_get_drvdata(hdev);
 
-	return snprintf(buf, PAGE_SIZE, "%u\n", data_pointer->dragging);
+	return sysfs_emit(buf, "%u\n", data_pointer->dragging);
 }
 
 static ssize_t attr_dragging_store_tpkbd(struct device *dev,
@@ -869,7 +868,7 @@ static ssize_t attr_release_to_select_show_tpkbd(struct device *dev,
 	struct hid_device *hdev = to_hid_device(dev);
 	struct lenovo_drvdata *data_pointer = hid_get_drvdata(hdev);
 
-	return snprintf(buf, PAGE_SIZE, "%u\n", data_pointer->release_to_select);
+	return sysfs_emit(buf, "%u\n", data_pointer->release_to_select);
 }
 
 static ssize_t attr_release_to_select_store_tpkbd(struct device *dev,
@@ -899,7 +898,7 @@ static ssize_t attr_select_right_show_tpkbd(struct device *dev,
 	struct hid_device *hdev = to_hid_device(dev);
 	struct lenovo_drvdata *data_pointer = hid_get_drvdata(hdev);
 
-	return snprintf(buf, PAGE_SIZE, "%u\n", data_pointer->select_right);
+	return sysfs_emit(buf, "%u\n", data_pointer->select_right);
 }
 
 static ssize_t attr_select_right_store_tpkbd(struct device *dev,
@@ -929,8 +928,7 @@ static ssize_t attr_sensitivity_show_tpkbd(struct device *dev,
 	struct hid_device *hdev = to_hid_device(dev);
 	struct lenovo_drvdata *data_pointer = hid_get_drvdata(hdev);
 
-	return snprintf(buf, PAGE_SIZE, "%u\n",
-		data_pointer->sensitivity);
+	return sysfs_emit(buf, "%u\n", data_pointer->sensitivity);
 }
 
 static ssize_t attr_sensitivity_store_tpkbd(struct device *dev,
@@ -958,8 +956,7 @@ static ssize_t attr_press_speed_show_tpkbd(struct device *dev,
 	struct hid_device *hdev = to_hid_device(dev);
 	struct lenovo_drvdata *data_pointer = hid_get_drvdata(hdev);
 
-	return snprintf(buf, PAGE_SIZE, "%u\n",
-		data_pointer->press_speed);
+	return sysfs_emit(buf, "%u\n", data_pointer->press_speed);
 }
 
 static ssize_t attr_press_speed_store_tpkbd(struct device *dev,
-- 
2.29.2

Re: [PATCH v4 1/4] HID: hid-picolcd*: Convert sprintf() family to sysfs_emit() family

[Jiri Kosina]

I have now applied the series, thanks.

-- 
Jiri Kosina
SUSE Labs