[PATCH v3 1/4] HID: hid-picolcd*: Convert sprintf/scnprintf to sysfs_emit/sysfs_emit_at

[PATCH v3 1/4] HID: hid-picolcd*: Convert sprintf/scnprintf to sysfs_emit/sysfs_emit_at

[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().

scnprintf() will be converted as weel 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: "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>
---
V3:
   Covert 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/
Signed-off-by: Li Zhijian <lizhijian@fujitsu.com>
---
 drivers/hid/hid-picolcd_core.c | 6 +++---
 drivers/hid/hid-picolcd_fb.c   | 4 ++--
 2 files changed, 5 insertions(+), 5 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..369c78d70e66 100644
--- a/drivers/hid/hid-picolcd_fb.c
+++ b/drivers/hid/hid-picolcd_fb.c
@@ -424,9 +424,9 @@ static ssize_t picolcd_fb_update_rate_show(struct device *dev,
 		if (ret >= PAGE_SIZE)
 			break;
 		else if (i == fb_update_rate)
-			ret += scnprintf(buf+ret, PAGE_SIZE-ret, "[%u] ", i);
+			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 v3 2/4] HID: hid-sensor-custom: Convert sprintf/snprintf to sysfs_emit

[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() will be converted as weel 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

[PATCH v3 3/4] HID: roccat: Convert sprintf/snprintf to sysfs_emit

[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() will be converted as weel 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 v3 4/4] HID: corsair,lenovo: Convert sprintf/snprintf to sysfs_emit

[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() will be converted as weel 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  | 19 ++++++++-----------
 2 files changed, 10 insertions(+), 13 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 149a3c74346b..26768c319361 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,
@@ -789,7 +788,7 @@ 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,
@@ -819,7 +818,7 @@ 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,
@@ -849,7 +848,7 @@ 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,
@@ -879,7 +878,7 @@ 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,
@@ -909,8 +908,7 @@ 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,
@@ -938,8 +936,7 @@ 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 v3 1/4] HID: hid-picolcd*: Convert sprintf/scnprintf to sysfs_emit/sysfs_emit_at

[Christophe JAILLET]

Le 18/03/2024 à 02:28, Li Zhijian a écrit :
> 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().
> 
> scnprintf() will be converted as weel 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: "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>
> ---
> V3:
>     Covert 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/
> Signed-off-by: Li Zhijian <lizhijian@fujitsu.com>
> ---
>   drivers/hid/hid-picolcd_core.c | 6 +++---
>   drivers/hid/hid-picolcd_fb.c   | 4 ++--
>   2 files changed, 5 insertions(+), 5 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..369c78d70e66 100644
> --- a/drivers/hid/hid-picolcd_fb.c
> +++ b/drivers/hid/hid-picolcd_fb.c
> @@ -424,9 +424,9 @@ static ssize_t picolcd_fb_update_rate_show(struct device *dev,

Hi,

just above we have:
	for (i = 1; i <= PICOLCDFB_UPDATE_RATE_LIMIT; i++)

>   		if (ret >= PAGE_SIZE)
>   			break;

and PICOLCDFB_UPDATE_RATE_LIMIT is 10, so it is not possible to have ret 
 >= PAGE_SIZE. Should it happen, sysfs_emit_at() handles it.
So, this test can also be removed, IMHO.

CJ

>   		else if (i == fb_update_rate)
> -			ret += scnprintf(buf+ret, PAGE_SIZE-ret, "[%u] ", i);
> +			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;

Re: [PATCH v3 1/4] HID: hid-picolcd*: Convert sprintf/scnprintf to sysfs_emit/sysfs_emit_at

[Zhijian Li (Fujitsu)]

On 19/03/2024 02:17, Christophe JAILLET wrote:
> Le 18/03/2024 à 02:28, Li Zhijian a écrit :
>> 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().
>>
>> scnprintf() will be converted as weel 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: "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>
>> ---
>> V3:
>>     Covert 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/
>> Signed-off-by: Li Zhijian <lizhijian@fujitsu.com>
>> ---
>>   drivers/hid/hid-picolcd_core.c | 6 +++---
>>   drivers/hid/hid-picolcd_fb.c   | 4 ++--
>>   2 files changed, 5 insertions(+), 5 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..369c78d70e66 100644
>> --- a/drivers/hid/hid-picolcd_fb.c
>> +++ b/drivers/hid/hid-picolcd_fb.c
>> @@ -424,9 +424,9 @@ static ssize_t picolcd_fb_update_rate_show(struct device *dev,
> 
> Hi,
> 
> just above we have:
>      for (i = 1; i <= PICOLCDFB_UPDATE_RATE_LIMIT; i++)
> 
>>           if (ret >= PAGE_SIZE)
>>               break;
> 
> and PICOLCDFB_UPDATE_RATE_LIMIT is 10, so it is not possible to have ret >= PAGE_SIZE. Should it happen, sysfs_emit_at() handles it.
> So, this test can also be removed, IMHO.

Good catch, i will update it.


Thanks
Zhijian

> 
> CJ
> 
>>           else if (i == fb_update_rate)
>> -            ret += scnprintf(buf+ret, PAGE_SIZE-ret, "[%u] ", i);
>> +            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;
>