2022-09-28 03:01:36

by ye xingchen

Subject: [PATCH linux-next v2] backlight: use sysfs_emit() to instead of scnprintf()

From: ye xingchen <[email protected]>

Replace the open-code with sysfs_emit() to simplify the code.

Signed-off-by: ye xingchen <[email protected]>
---
v1 -> v2
Add the rest of this fixes for this pattern in the 'drivers/video/backlight' directory.
drivers/video/backlight/lm3533_bl.c | 10 +++++-----
drivers/video/backlight/lp855x_bl.c | 4 ++--
2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/video/backlight/lm3533_bl.c b/drivers/video/backlight/lm3533_bl.c
index 1df1b6643c0b..5e2ce9285245 100644
--- a/drivers/video/backlight/lm3533_bl.c
+++ b/drivers/video/backlight/lm3533_bl.c
@@ -66,7 +66,7 @@ static ssize_t show_id(struct device *dev,
{
struct lm3533_bl *bl = dev_get_drvdata(dev);

- return scnprintf(buf, PAGE_SIZE, "%d\n", bl->id);
+ return sysfs_emit(buf, "%d\n", bl->id);
}

static ssize_t show_als_channel(struct device *dev,
@@ -75,7 +75,7 @@ static ssize_t show_als_channel(struct device *dev,
struct lm3533_bl *bl = dev_get_drvdata(dev);
unsigned channel = lm3533_bl_get_ctrlbank_id(bl);

- return scnprintf(buf, PAGE_SIZE, "%u\n", channel);
+ return sysfs_emit(buf, "%u\n", channel);
}

static ssize_t show_als_en(struct device *dev,
@@ -95,7 +95,7 @@ static ssize_t show_als_en(struct device *dev,
mask = 1 << (2 * ctrlbank);
enable = val & mask;

- return scnprintf(buf, PAGE_SIZE, "%d\n", enable);
+ return sysfs_emit(buf, "%d\n", enable);
}

static ssize_t store_als_en(struct device *dev,
@@ -147,7 +147,7 @@ static ssize_t show_linear(struct device *dev,
else
linear = 0;

- return scnprintf(buf, PAGE_SIZE, "%x\n", linear);
+ return sysfs_emit(buf, "%x\n", linear);
}

static ssize_t store_linear(struct device *dev,
@@ -190,7 +190,7 @@ static ssize_t show_pwm(struct device *dev,
if (ret)
return ret;

- return scnprintf(buf, PAGE_SIZE, "%u\n", val);
+ return sysfs_emit(buf, "%u\n", val);
}

static ssize_t store_pwm(struct device *dev,
diff --git a/drivers/video/backlight/lp855x_bl.c b/drivers/video/backlight/lp855x_bl.c
index bd0bdeae23a4..fafc1a9e76ef 100644
--- a/drivers/video/backlight/lp855x_bl.c
+++ b/drivers/video/backlight/lp855x_bl.c
@@ -293,7 +293,7 @@ static ssize_t lp855x_get_chip_id(struct device *dev,
{
struct lp855x *lp = dev_get_drvdata(dev);

- return scnprintf(buf, PAGE_SIZE, "%s\n", lp->chipname);
+ return sysfs_emit(buf, "%s\n", lp->chipname);
}

static ssize_t lp855x_get_bl_ctl_mode(struct device *dev,
@@ -307,7 +307,7 @@ static ssize_t lp855x_get_bl_ctl_mode(struct device *dev,
else if (lp->mode == REGISTER_BASED)
strmode = "register based";

- return scnprintf(buf, PAGE_SIZE, "%s\n", strmode);
+ return sysfs_emit(buf, "%s\n", strmode);
}

static DEVICE_ATTR(chip_id, S_IRUGO, lp855x_get_chip_id, NULL);
--
2.25.1

2022-09-28 09:01:08

by Daniel Thompson

Subject: Re: [PATCH linux-next v2] backlight: use sysfs_emit() to instead of scnprintf()

On Wed, Sep 28, 2022 at 01:41:15AM +0000, [email protected] wrote:
> From: ye xingchen <[email protected]>
>
> Replace the open-code with sysfs_emit() to simplify the code.
>
> Signed-off-by: ye xingchen <[email protected]>
> ---
> v1 -> v2
> Add the rest of this fixes for this pattern in the 'drivers/video/backlight' directory.
> drivers/video/backlight/lm3533_bl.c | 10 +++++-----
> drivers/video/backlight/lp855x_bl.c | 4 ++--

What happened to the lp8788 fixes?


Daniel.


> 2 files changed, 7 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/video/backlight/lm3533_bl.c b/drivers/video/backlight/lm3533_bl.c
> index 1df1b6643c0b..5e2ce9285245 100644
> --- a/drivers/video/backlight/lm3533_bl.c
> +++ b/drivers/video/backlight/lm3533_bl.c
> @@ -66,7 +66,7 @@ static ssize_t show_id(struct device *dev,
> {
> struct lm3533_bl *bl = dev_get_drvdata(dev);
>
> - return scnprintf(buf, PAGE_SIZE, "%d\n", bl->id);
> + return sysfs_emit(buf, "%d\n", bl->id);
> }
>
> static ssize_t show_als_channel(struct device *dev,
> @@ -75,7 +75,7 @@ static ssize_t show_als_channel(struct device *dev,
> struct lm3533_bl *bl = dev_get_drvdata(dev);
> unsigned channel = lm3533_bl_get_ctrlbank_id(bl);
>
> - return scnprintf(buf, PAGE_SIZE, "%u\n", channel);
> + return sysfs_emit(buf, "%u\n", channel);
> }
>
> static ssize_t show_als_en(struct device *dev,
> @@ -95,7 +95,7 @@ static ssize_t show_als_en(struct device *dev,
> mask = 1 << (2 * ctrlbank);
> enable = val & mask;
>
> - return scnprintf(buf, PAGE_SIZE, "%d\n", enable);
> + return sysfs_emit(buf, "%d\n", enable);
> }
>
> static ssize_t store_als_en(struct device *dev,
> @@ -147,7 +147,7 @@ static ssize_t show_linear(struct device *dev,
> else
> linear = 0;
>
> - return scnprintf(buf, PAGE_SIZE, "%x\n", linear);
> + return sysfs_emit(buf, "%x\n", linear);
> }
>
> static ssize_t store_linear(struct device *dev,
> @@ -190,7 +190,7 @@ static ssize_t show_pwm(struct device *dev,
> if (ret)
> return ret;
>
> - return scnprintf(buf, PAGE_SIZE, "%u\n", val);
> + return sysfs_emit(buf, "%u\n", val);
> }
>
> static ssize_t store_pwm(struct device *dev,
> diff --git a/drivers/video/backlight/lp855x_bl.c b/drivers/video/backlight/lp855x_bl.c
> index bd0bdeae23a4..fafc1a9e76ef 100644
> --- a/drivers/video/backlight/lp855x_bl.c
> +++ b/drivers/video/backlight/lp855x_bl.c
> @@ -293,7 +293,7 @@ static ssize_t lp855x_get_chip_id(struct device *dev,
> {
> struct lp855x *lp = dev_get_drvdata(dev);
>
> - return scnprintf(buf, PAGE_SIZE, "%s\n", lp->chipname);
> + return sysfs_emit(buf, "%s\n", lp->chipname);
> }
>
> static ssize_t lp855x_get_bl_ctl_mode(struct device *dev,
> @@ -307,7 +307,7 @@ static ssize_t lp855x_get_bl_ctl_mode(struct device *dev,
> else if (lp->mode == REGISTER_BASED)
> strmode = "register based";
>
> - return scnprintf(buf, PAGE_SIZE, "%s\n", strmode);
> + return sysfs_emit(buf, "%s\n", strmode);
> }
>
> static DEVICE_ATTR(chip_id, S_IRUGO, lp855x_get_chip_id, NULL);
> --
> 2.25.1
>
>