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MLK-12932-01: pwm backlight: Add fb name check feature 

Add fb name check function pwm_backlight_check_fb_name(),
pwm driver can banding to fb with fb name when driver working
in device tree architecture.

Signed-off-by: Sandor Yu <Sandor.yu@nxp.com>
Signed-off-by: Vipul Kumar <vipul_kumar@mentor.com>
This commit is contained in:
Sandor Yu 2019-01-08 17:42:10 +05:30 committed by Dong Aisheng
parent 219d54332a
commit 4fa439eff9
2 changed files with 20 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/video/backlight/pwm_bl.c
View File

@ -38,6 +38,7 @@ struct pwm_bl_data {
int brightness);
int (*check_fb)(struct device *, struct fb_info *);
void (*exit)(struct device *);
char fb_id[16];
};
static void pwm_backlight_power_on(struct pwm_bl_data *pb)
@ -222,6 +223,17 @@ int pwm_backlight_brightness_default(struct device *dev,
return 0;
}
static int pwm_backlight_check_fb_name(struct device *dev, struct fb_info *info)
{
struct backlight_device *bl = dev_get_drvdata(dev);
struct pwm_bl_data *pb = bl_get_data(bl);
if (strcmp(info->fix.id, pb->fb_id) == 0)
return true;
return false;
}
static int pwm_backlight_parse_dt(struct device *dev,
struct platform_pwm_backlight_data *data)
{
@ -234,12 +246,18 @@ static int pwm_backlight_parse_dt(struct device *dev,
int length;
u32 value;
int ret;
const char *names;
if (!node)
return -ENODEV;
memset(data, 0, sizeof(*data));
if (!of_property_read_string(node, "fb-names", &names)) {
strcpy(data->fb_id, names);
data->check_fb = &pwm_backlight_check_fb_name;
}
/*
* These values are optional and set as 0 by default, the out values
* are modified only if a valid u32 value can be decoded.
@ -361,7 +379,6 @@ static int pwm_backlight_parse_dt(struct device *dev,
data->max_brightness--;
}
return 0;
}
@ -484,6 +501,7 @@ static int pwm_backlight_probe(struct platform_device *pdev)
pb->enabled = false;
pb->post_pwm_on_delay = data->post_pwm_on_delay;
pb->pwm_off_delay = data->pwm_off_delay;
strcpy(pb->fb_id, data->fb_id);
pb->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
GPIOD_ASIS);

1
include/linux/pwm_backlight.h
View File

@ -23,6 +23,7 @@ struct platform_pwm_backlight_data {
void (*notify_after)(struct device *dev, int brightness);
void (*exit)(struct device *dev);
int (*check_fb)(struct device *dev, struct fb_info *info);
char fb_id[16];
};
#endif