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auxdisplay: linedisp: encapsulate container_of usage within to_linedisp

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Replace direct container_of() calls with a to_linedisp() helper function
throughout the line-display auxdisplay library module. This abstraction
prepares for upcoming dual-mode support where linedisp context retrieval
will need to handle both dedicated child devices and attached parent
auxdisplay devices.

No functional changes in this patch.

Signed-off-by: Jean-François Lessard <jefflessard3@gmail.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
This commit is contained in:
Jean-François Lessard 2025-09-18 08:13:12 -04:00 committed by Andy Shevchenko
parent 1cdaf601ef
commit 66c9380948
1 changed files with 13 additions and 8 deletions
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21
drivers/auxdisplay/line-display.c
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@ -31,6 +31,11 @@
#define DEFAULT_SCROLL_RATE (HZ / 2) #define DEFAULT_SCROLL_RATE (HZ / 2)
static struct linedisp *to_linedisp(struct device *dev)
{
return container_of(dev, struct linedisp, dev);
}
/** /**
* linedisp_scroll() - scroll the display by a character * linedisp_scroll() - scroll the display by a character
* @t: really a pointer to the private data structure * @t: really a pointer to the private data structure
@ -133,7 +138,7 @@ static int linedisp_display(struct linedisp *linedisp, const char *msg,
static ssize_t message_show(struct device *dev, struct device_attribute *attr, static ssize_t message_show(struct device *dev, struct device_attribute *attr,
char *buf) char *buf)
{ {
struct linedisp *linedisp = container_of(dev, struct linedisp, dev); struct linedisp *linedisp = to_linedisp(dev);
return sysfs_emit(buf, "%s\n", linedisp->message); return sysfs_emit(buf, "%s\n", linedisp->message);
} }
@ -152,7 +157,7 @@ static ssize_t message_show(struct device *dev, struct device_attribute *attr,
static ssize_t message_store(struct device *dev, struct device_attribute *attr, static ssize_t message_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count) const char *buf, size_t count)
{ {
struct linedisp *linedisp = container_of(dev, struct linedisp, dev); struct linedisp *linedisp = to_linedisp(dev);
int err; int err;
err = linedisp_display(linedisp, buf, count); err = linedisp_display(linedisp, buf, count);
@ -164,7 +169,7 @@ static DEVICE_ATTR_RW(message);
static ssize_t scroll_step_ms_show(struct device *dev, static ssize_t scroll_step_ms_show(struct device *dev,
struct device_attribute *attr, char *buf) struct device_attribute *attr, char *buf)
{ {
struct linedisp *linedisp = container_of(dev, struct linedisp, dev); struct linedisp *linedisp = to_linedisp(dev);
return sysfs_emit(buf, "%u\n", jiffies_to_msecs(linedisp->scroll_rate)); return sysfs_emit(buf, "%u\n", jiffies_to_msecs(linedisp->scroll_rate));
} }
@ -173,7 +178,7 @@ static ssize_t scroll_step_ms_store(struct device *dev,
struct device_attribute *attr, struct device_attribute *attr,
const char *buf, size_t count) const char *buf, size_t count)
{ {
struct linedisp *linedisp = container_of(dev, struct linedisp, dev); struct linedisp *linedisp = to_linedisp(dev);
unsigned int ms; unsigned int ms;
int err; int err;
@ -195,7 +200,7 @@ static DEVICE_ATTR_RW(scroll_step_ms);
static ssize_t map_seg_show(struct device *dev, struct device_attribute *attr, char *buf) static ssize_t map_seg_show(struct device *dev, struct device_attribute *attr, char *buf)
{ {
struct linedisp *linedisp = container_of(dev, struct linedisp, dev); struct linedisp *linedisp = to_linedisp(dev);
struct linedisp_map *map = linedisp->map; struct linedisp_map *map = linedisp->map;
memcpy(buf, &map->map, map->size); memcpy(buf, &map->map, map->size);
@ -205,7 +210,7 @@ static ssize_t map_seg_show(struct device *dev, struct device_attribute *attr, c
static ssize_t map_seg_store(struct device *dev, struct device_attribute *attr, static ssize_t map_seg_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count) const char *buf, size_t count)
{ {
struct linedisp *linedisp = container_of(dev, struct linedisp, dev); struct linedisp *linedisp = to_linedisp(dev);
struct linedisp_map *map = linedisp->map; struct linedisp_map *map = linedisp->map;
if (count != map->size) if (count != map->size)
@ -232,7 +237,7 @@ static struct attribute *linedisp_attrs[] = {
static umode_t linedisp_attr_is_visible(struct kobject *kobj, struct attribute *attr, int n) static umode_t linedisp_attr_is_visible(struct kobject *kobj, struct attribute *attr, int n)
{ {
struct device *dev = kobj_to_dev(kobj); struct device *dev = kobj_to_dev(kobj);
struct linedisp *linedisp = container_of(dev, struct linedisp, dev); struct linedisp *linedisp = to_linedisp(dev);
struct linedisp_map *map = linedisp->map; struct linedisp_map *map = linedisp->map;
umode_t mode = attr->mode; umode_t mode = attr->mode;
@ -263,7 +268,7 @@ static DEFINE_IDA(linedisp_id);
static void linedisp_release(struct device *dev) static void linedisp_release(struct device *dev)
{ {
struct linedisp *linedisp = container_of(dev, struct linedisp, dev); struct linedisp *linedisp = to_linedisp(dev);
kfree(linedisp->map); kfree(linedisp->map);
kfree(linedisp->message); kfree(linedisp->message);