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path: root/drivers/auxdisplay/line-display.c
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Diffstat (limited to 'drivers/auxdisplay/line-display.c')
-rw-r--r--drivers/auxdisplay/line-display.c166
1 files changed, 148 insertions, 18 deletions
diff --git a/drivers/auxdisplay/line-display.c b/drivers/auxdisplay/line-display.c
index 03e7f104aa..e2b546210f 100644
--- a/drivers/auxdisplay/line-display.c
+++ b/drivers/auxdisplay/line-display.c
@@ -10,13 +10,21 @@
#include <generated/utsrelease.h>
+#include <linux/container_of.h>
#include <linux/device.h>
+#include <linux/export.h>
+#include <linux/idr.h>
+#include <linux/jiffies.h>
+#include <linux/kstrtox.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/sysfs.h>
#include <linux/timer.h>
+#include <linux/map_to_7segment.h>
+#include <linux/map_to_14segment.h>
+
#include "line-display.h"
#define DEFAULT_SCROLL_RATE (HZ / 2)
@@ -45,7 +53,7 @@ static void linedisp_scroll(struct timer_list *t)
}
/* update the display */
- linedisp->update(linedisp);
+ linedisp->ops->update(linedisp);
/* move on to the next character */
linedisp->scroll_pos++;
@@ -89,7 +97,7 @@ static int linedisp_display(struct linedisp *linedisp, const char *msg,
linedisp->message = NULL;
linedisp->message_len = 0;
memset(linedisp->buf, ' ', linedisp->num_chars);
- linedisp->update(linedisp);
+ linedisp->ops->update(linedisp);
return 0;
}
@@ -165,9 +173,11 @@ static ssize_t scroll_step_ms_store(struct device *dev,
{
struct linedisp *linedisp = container_of(dev, struct linedisp, dev);
unsigned int ms;
+ int err;
- if (kstrtouint(buf, 10, &ms) != 0)
- return -EINVAL;
+ err = kstrtouint(buf, 10, &ms);
+ if (err)
+ return err;
linedisp->scroll_rate = msecs_to_jiffies(ms);
if (linedisp->message && linedisp->message_len > linedisp->num_chars) {
@@ -181,45 +191,165 @@ static ssize_t scroll_step_ms_store(struct device *dev,
static DEVICE_ATTR_RW(scroll_step_ms);
+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_map *map = linedisp->map;
+
+ memcpy(buf, &map->map, map->size);
+ return map->size;
+}
+
+static ssize_t map_seg_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct linedisp *linedisp = container_of(dev, struct linedisp, dev);
+ struct linedisp_map *map = linedisp->map;
+
+ if (count != map->size)
+ return -EINVAL;
+
+ memcpy(&map->map, buf, count);
+ return count;
+}
+
+static const SEG7_DEFAULT_MAP(initial_map_seg7);
+static DEVICE_ATTR(map_seg7, 0644, map_seg_show, map_seg_store);
+
+static const SEG14_DEFAULT_MAP(initial_map_seg14);
+static DEVICE_ATTR(map_seg14, 0644, map_seg_show, map_seg_store);
+
static struct attribute *linedisp_attrs[] = {
&dev_attr_message.attr,
&dev_attr_scroll_step_ms.attr,
- NULL,
+ &dev_attr_map_seg7.attr,
+ &dev_attr_map_seg14.attr,
+ NULL
+};
+
+static umode_t linedisp_attr_is_visible(struct kobject *kobj, struct attribute *attr, int n)
+{
+ struct device *dev = kobj_to_dev(kobj);
+ struct linedisp *linedisp = container_of(dev, struct linedisp, dev);
+ struct linedisp_map *map = linedisp->map;
+ umode_t mode = attr->mode;
+
+ if (attr == &dev_attr_map_seg7.attr) {
+ if (!map)
+ return 0;
+ if (map->type != LINEDISP_MAP_SEG7)
+ return 0;
+ }
+
+ if (attr == &dev_attr_map_seg14.attr) {
+ if (!map)
+ return 0;
+ if (map->type != LINEDISP_MAP_SEG14)
+ return 0;
+ }
+
+ return mode;
};
-ATTRIBUTE_GROUPS(linedisp);
+
+static const struct attribute_group linedisp_group = {
+ .is_visible = linedisp_attr_is_visible,
+ .attrs = linedisp_attrs,
+};
+__ATTRIBUTE_GROUPS(linedisp);
+
+static DEFINE_IDA(linedisp_id);
+
+static void linedisp_release(struct device *dev)
+{
+ struct linedisp *linedisp = container_of(dev, struct linedisp, dev);
+
+ kfree(linedisp->map);
+ kfree(linedisp->message);
+ kfree(linedisp->buf);
+ ida_free(&linedisp_id, linedisp->id);
+}
static const struct device_type linedisp_type = {
.groups = linedisp_groups,
+ .release = linedisp_release,
};
+static int linedisp_init_map(struct linedisp *linedisp)
+{
+ struct linedisp_map *map;
+ int err;
+
+ if (!linedisp->ops->get_map_type)
+ return 0;
+
+ err = linedisp->ops->get_map_type(linedisp);
+ if (err < 0)
+ return err;
+
+ map = kmalloc(sizeof(*map), GFP_KERNEL);
+ if (!map)
+ return -ENOMEM;
+
+ map->type = err;
+
+ /* assign initial mapping */
+ switch (map->type) {
+ case LINEDISP_MAP_SEG7:
+ map->map.seg7 = initial_map_seg7;
+ map->size = sizeof(map->map.seg7);
+ break;
+ case LINEDISP_MAP_SEG14:
+ map->map.seg14 = initial_map_seg14;
+ map->size = sizeof(map->map.seg14);
+ break;
+ default:
+ kfree(map);
+ return -EINVAL;
+ }
+
+ linedisp->map = map;
+
+ return 0;
+}
+
/**
* linedisp_register - register a character line display
* @linedisp: pointer to character line display structure
* @parent: parent device
* @num_chars: the number of characters that can be displayed
- * @buf: pointer to a buffer that can hold @num_chars characters
- * @update: Function called to update the display. This must not sleep!
+ * @ops: character line display operations
*
* Return: zero on success, else a negative error code.
*/
int linedisp_register(struct linedisp *linedisp, struct device *parent,
- unsigned int num_chars, char *buf,
- void (*update)(struct linedisp *linedisp))
+ unsigned int num_chars, const struct linedisp_ops *ops)
{
- static atomic_t linedisp_id = ATOMIC_INIT(-1);
int err;
memset(linedisp, 0, sizeof(*linedisp));
linedisp->dev.parent = parent;
linedisp->dev.type = &linedisp_type;
- linedisp->update = update;
- linedisp->buf = buf;
+ linedisp->ops = ops;
linedisp->num_chars = num_chars;
linedisp->scroll_rate = DEFAULT_SCROLL_RATE;
+ err = ida_alloc(&linedisp_id, GFP_KERNEL);
+ if (err < 0)
+ return err;
+ linedisp->id = err;
+
device_initialize(&linedisp->dev);
- dev_set_name(&linedisp->dev, "linedisp.%lu",
- (unsigned long)atomic_inc_return(&linedisp_id));
+ dev_set_name(&linedisp->dev, "linedisp.%u", linedisp->id);
+
+ err = -ENOMEM;
+ linedisp->buf = kzalloc(linedisp->num_chars, GFP_KERNEL);
+ if (!linedisp->buf)
+ goto out_put_device;
+
+ /* initialise a character mapping, if required */
+ err = linedisp_init_map(linedisp);
+ if (err)
+ goto out_put_device;
/* initialise a timer for scrolling the message */
timer_setup(&linedisp->timer, linedisp_scroll, 0);
@@ -239,10 +369,11 @@ out_del_dev:
device_del(&linedisp->dev);
out_del_timer:
del_timer_sync(&linedisp->timer);
+out_put_device:
put_device(&linedisp->dev);
return err;
}
-EXPORT_SYMBOL_GPL(linedisp_register);
+EXPORT_SYMBOL_NS_GPL(linedisp_register, LINEDISP);
/**
* linedisp_unregister - unregister a character line display
@@ -253,9 +384,8 @@ void linedisp_unregister(struct linedisp *linedisp)
{
device_del(&linedisp->dev);
del_timer_sync(&linedisp->timer);
- kfree(linedisp->message);
put_device(&linedisp->dev);
}
-EXPORT_SYMBOL_GPL(linedisp_unregister);
+EXPORT_SYMBOL_NS_GPL(linedisp_unregister, LINEDISP);
MODULE_LICENSE("GPL");