Dmitry Torokhov wrote:
> Hi Mauro,
>
> On Thu, Mar 11, 2010 at 12:46:19PM -0300, Mauro Carvalho Chehab wrote:
>> In order to allow userspace programs to autoload an IR table, a link is
>> needed to point to the corresponding input device.
>>
>> $ tree /sys/class/irrcv/irrcv0
>> /sys/class/irrcv/irrcv0
>> |-- current_protocol
>> |-- input -> ../../../pci0000:00/0000:00:0b.1/usb1/1-3/input/input22
>> |-- power
>> | `-- wakeup
>> |-- subsystem -> ../../../../class/irrcv
>> `-- uevent
>>
>> It is now easy to associate an irrcv device with the corresponding
>> device node, at the input interface.
>>
>
> I guess the question is why don't you make input device a child of your
> irrcvX device? Then I believe driver core will link them properly. It
> will also ensure proper power management hierarchy.
>
> That probably will require you changing from class_dev into device but
> that's the direction kernel is going to anyway.
Done, see enclosed. It is now using class_register/device_register. The
newly created device for irrcv is used as the parent for input_dev->dev.
The resulting code looked cleaner after the change ;)
Cheers,
Mauro
---
V4L/DVB: ir: use a real device instead of a virtual class
Change the ir-sysfs approach to create irrcv0 as a device, instead of
using class_dev. Also, change the way input is registered, in order
to make its parent to be the irrcv device.
Due to this change, now the event device is created under
/sys/class/ir/irrcv class:
/sys/class/irrcv/irrcv0/
|-- current_protocol
|-- device -> ../../../1-3
|-- input9
| |-- capabilities
| | |-- abs
...
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
diff --git a/drivers/media/IR/ir-keytable.c b/drivers/media/IR/ir-keytable.c
index 0903f53..c9c0a54 100644
--- a/drivers/media/IR/ir-keytable.c
+++ b/drivers/media/IR/ir-keytable.c
@@ -448,22 +448,15 @@ int ir_input_register(struct input_dev *input_dev,
input_dev->setkeycode = ir_setkeycode;
input_set_drvdata(input_dev, ir_dev);
- rc = input_register_device(input_dev);
- if (rc < 0)
- goto err;
-
rc = ir_register_class(input_dev);
- if (rc < 0) {
- input_unregister_device(input_dev);
+ if (rc < 0)
goto err;
- }
return 0;
err:
kfree(rc_tab->scan);
kfree(ir_dev);
- input_set_drvdata(input_dev, NULL);
return rc;
}
EXPORT_SYMBOL_GPL(ir_input_register);
@@ -492,7 +485,6 @@ void ir_input_unregister(struct input_dev *dev)
ir_unregister_class(dev);
kfree(ir_dev);
- input_unregister_device(dev);
}
EXPORT_SYMBOL_GPL(ir_input_unregister);
diff --git a/drivers/media/IR/ir-sysfs.c b/drivers/media/IR/ir-sysfs.c
index bf5fbcd..1bb011a 100644
--- a/drivers/media/IR/ir-sysfs.c
+++ b/drivers/media/IR/ir-sysfs.c
@@ -22,7 +22,15 @@
static unsigned long ir_core_dev_number;
/* class for /sys/class/irrcv */
-static struct class *ir_input_class;
+static char *ir_devnode(struct device *dev, mode_t *mode)
+{
+ return kasprintf(GFP_KERNEL, "irrcv/%s", dev_name(dev));
+}
+
+struct class ir_input_class = {
+ .name = "irrcv",
+ .devnode = ir_devnode,
+};
/**
* show_protocol() - shows the current IR protocol
@@ -128,6 +136,20 @@ static struct attribute *ir_dev_attrs[] = {
NULL,
};
+static struct attribute_group ir_dev_attr_grp = {
+ .attrs =ir_dev_attrs,
+};
+
+static const struct attribute_group *ir_dev_attr_groups[] = {
+ &ir_dev_attr_grp,
+ NULL
+};
+
+static struct device_type ir_dev_type = {
+ .groups = ir_dev_attr_groups,
+};
+
+
/**
* ir_register_class() - creates the sysfs for /sys/class/irrcv/irrcv?
* @input_dev: the struct input_dev descriptor of the device
@@ -137,7 +159,7 @@ static struct attribute *ir_dev_attrs[] = {
int ir_register_class(struct input_dev *input_dev)
{
int rc;
- struct kobject *kobj;
+ const char *path;
struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
int devno = find_first_zero_bit(&ir_core_dev_number,
@@ -146,19 +168,31 @@ int ir_register_class(struct input_dev *input_dev)
if (unlikely(devno < 0))
return devno;
- ir_dev->attr.attrs = ir_dev_attrs;
- ir_dev->class_dev = device_create(ir_input_class, NULL,
- input_dev->dev.devt, ir_dev,
- "irrcv%d", devno);
- kobj = &ir_dev->class_dev->kobj;
-
- printk(KERN_WARNING "Creating IR device %s\n", kobject_name(kobj));
- rc = sysfs_create_group(kobj, &ir_dev->attr);
- if (unlikely(rc < 0)) {
- device_destroy(ir_input_class, input_dev->dev.devt);
- return -ENOMEM;
+ ir_dev->dev.type = &ir_dev_type;
+ ir_dev->dev.class = &ir_input_class;
+ ir_dev->dev.parent = input_dev->dev.parent;
+ dev_set_name(&ir_dev->dev, "irrcv%d", devno);
+ rc = device_register(&ir_dev->dev);
+ if (rc)
+ return rc;
+
+
+ input_dev->dev.parent = &ir_dev->dev;
+ rc = input_register_device(input_dev);
+ if (rc < 0) {
+ device_del(&ir_dev->dev);
+ return rc;
}
+ __module_get(THIS_MODULE);
+
+ path = kobject_get_path(&input_dev->dev.kobj, GFP_KERNEL);
+ printk(KERN_INFO "%s: %s associated with sysfs %s\n",
+ dev_name(&ir_dev->dev),
+ input_dev->name ? input_dev->name : "Unspecified device",
+ path ? path : "N/A");
+ kfree(path);
+
ir_dev->devno = devno;
set_bit(devno, &ir_core_dev_number);
@@ -175,16 +209,12 @@ int ir_register_class(struct input_dev *input_dev)
void ir_unregister_class(struct input_dev *input_dev)
{
struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
- struct kobject *kobj;
clear_bit(ir_dev->devno, &ir_core_dev_number);
+ input_unregister_device(input_dev);
+ device_del(&ir_dev->dev);
- kobj = &ir_dev->class_dev->kobj;
-
- sysfs_remove_group(kobj, &ir_dev->attr);
- device_destroy(ir_input_class, input_dev->dev.devt);
-
- kfree(ir_dev->attr.name);
+ module_put(THIS_MODULE);
}
/*
@@ -193,10 +223,10 @@ void ir_unregister_class(struct input_dev *input_dev)
static int __init ir_core_init(void)
{
- ir_input_class = class_create(THIS_MODULE, "irrcv");
- if (IS_ERR(ir_input_class)) {
+ int rc = class_register(&ir_input_class);
+ if (rc) {
printk(KERN_ERR "ir_core: unable to register irrcv class\n");
- return PTR_ERR(ir_input_class);
+ return rc;
}
return 0;
@@ -204,7 +234,7 @@ static int __init ir_core_init(void)
static void __exit ir_core_exit(void)
{
- class_destroy(ir_input_class);
+ class_unregister(&ir_input_class);
}
module_init(ir_core_init);
diff --git a/include/media/ir-core.h b/include/media/ir-core.h
index 61c223b..ce9f347 100644
--- a/include/media/ir-core.h
+++ b/include/media/ir-core.h
@@ -47,11 +47,9 @@ struct ir_dev_props {
struct ir_input_dev {
- struct input_dev *dev; /* Input device*/
+ struct device dev; /* device */
struct ir_scancode_table rc_tab; /* scan/key table */
unsigned long devno; /* device number */
- struct attribute_group attr; /* IR attributes */
- struct device *class_dev; /* virtual class dev */
const struct ir_dev_props *props; /* Device properties */
};
#define to_ir_input_dev(_attr) container_of(_attr, struct ir_input_dev, attr)
--
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