diff options
author | Hans Verkuil <hverkuil@xs4all.nl> | 2009-02-14 09:54:23 -0500 |
---|---|---|
committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2009-03-30 11:42:50 -0400 |
commit | 3a63e4492fbc7aa7f99d4368822da1382ec6fe03 (patch) | |
tree | d9d50f32757e7acde5f7ce3ecb22866b1cf51023 | |
parent | 62cfdacc9431cad7f9093e91b17ea68d684188ae (diff) |
V4L/DVB (10643): v4l2-device: allow a NULL parent device when registering.
Some drivers (e.g. for ISA devices) have no parent device because there
is no associated bus driver. Allow the parent device to be NULL in
those cases when registering v4l2_device.
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
-rw-r--r-- | Documentation/video4linux/v4l2-framework.txt | 10 | ||||
-rw-r--r-- | drivers/media/video/v4l2-device.c | 37 | ||||
-rw-r--r-- | include/media/v4l2-device.h | 31 |
3 files changed, 48 insertions, 30 deletions
diff --git a/Documentation/video4linux/v4l2-framework.txt b/Documentation/video4linux/v4l2-framework.txt index 48cdf86248cb..e1620e2a38ff 100644 --- a/Documentation/video4linux/v4l2-framework.txt +++ b/Documentation/video4linux/v4l2-framework.txt | |||
@@ -84,12 +84,14 @@ You must register the device instance: | |||
84 | v4l2_device_register(struct device *dev, struct v4l2_device *v4l2_dev); | 84 | v4l2_device_register(struct device *dev, struct v4l2_device *v4l2_dev); |
85 | 85 | ||
86 | Registration will initialize the v4l2_device struct and link dev->driver_data | 86 | Registration will initialize the v4l2_device struct and link dev->driver_data |
87 | to v4l2_dev. Registration will also set v4l2_dev->name to a value derived from | 87 | to v4l2_dev. If v4l2_dev->name is empty then it will be set to a value derived |
88 | dev (driver name followed by the bus_id, to be precise). You may change the | 88 | from dev (driver name followed by the bus_id, to be precise). If you set it |
89 | name after registration if you want. | 89 | up before calling v4l2_device_register then it will be untouched. If dev is |
90 | NULL, then you *must* setup v4l2_dev->name before calling v4l2_device_register. | ||
90 | 91 | ||
91 | The first 'dev' argument is normally the struct device pointer of a pci_dev, | 92 | The first 'dev' argument is normally the struct device pointer of a pci_dev, |
92 | usb_device or platform_device. | 93 | usb_device or platform_device. It is rare for dev to be NULL, but it happens |
94 | with ISA devices, for example. | ||
93 | 95 | ||
94 | You unregister with: | 96 | You unregister with: |
95 | 97 | ||
diff --git a/drivers/media/video/v4l2-device.c b/drivers/media/video/v4l2-device.c index 8a4b74f3129f..3330ffb7d010 100644 --- a/drivers/media/video/v4l2-device.c +++ b/drivers/media/video/v4l2-device.c | |||
@@ -26,15 +26,24 @@ | |||
26 | 26 | ||
27 | int v4l2_device_register(struct device *dev, struct v4l2_device *v4l2_dev) | 27 | int v4l2_device_register(struct device *dev, struct v4l2_device *v4l2_dev) |
28 | { | 28 | { |
29 | if (dev == NULL || v4l2_dev == NULL) | 29 | if (v4l2_dev == NULL) |
30 | return -EINVAL; | 30 | return -EINVAL; |
31 | /* Warn if we apparently re-register a device */ | 31 | |
32 | WARN_ON(dev_get_drvdata(dev) != NULL); | ||
33 | INIT_LIST_HEAD(&v4l2_dev->subdevs); | 32 | INIT_LIST_HEAD(&v4l2_dev->subdevs); |
34 | spin_lock_init(&v4l2_dev->lock); | 33 | spin_lock_init(&v4l2_dev->lock); |
35 | v4l2_dev->dev = dev; | 34 | v4l2_dev->dev = dev; |
36 | snprintf(v4l2_dev->name, sizeof(v4l2_dev->name), "%s %s", | 35 | if (dev == NULL) { |
36 | /* If dev == NULL, then name must be filled in by the caller */ | ||
37 | WARN_ON(!v4l2_dev->name[0]); | ||
38 | return 0; | ||
39 | } | ||
40 | |||
41 | /* Set name to driver name + device name if it is empty. */ | ||
42 | if (!v4l2_dev->name[0]) | ||
43 | snprintf(v4l2_dev->name, sizeof(v4l2_dev->name), "%s %s", | ||
37 | dev->driver->name, dev_name(dev)); | 44 | dev->driver->name, dev_name(dev)); |
45 | if (dev_get_drvdata(dev)) | ||
46 | v4l2_warn(v4l2_dev, "Non-NULL drvdata on register\n"); | ||
38 | dev_set_drvdata(dev, v4l2_dev); | 47 | dev_set_drvdata(dev, v4l2_dev); |
39 | return 0; | 48 | return 0; |
40 | } | 49 | } |
@@ -44,10 +53,11 @@ void v4l2_device_unregister(struct v4l2_device *v4l2_dev) | |||
44 | { | 53 | { |
45 | struct v4l2_subdev *sd, *next; | 54 | struct v4l2_subdev *sd, *next; |
46 | 55 | ||
47 | if (v4l2_dev == NULL || v4l2_dev->dev == NULL) | 56 | if (v4l2_dev == NULL) |
48 | return; | 57 | return; |
49 | dev_set_drvdata(v4l2_dev->dev, NULL); | 58 | if (v4l2_dev->dev) |
50 | /* unregister subdevs */ | 59 | dev_set_drvdata(v4l2_dev->dev, NULL); |
60 | /* Unregister subdevs */ | ||
51 | list_for_each_entry_safe(sd, next, &v4l2_dev->subdevs, list) | 61 | list_for_each_entry_safe(sd, next, &v4l2_dev->subdevs, list) |
52 | v4l2_device_unregister_subdev(sd); | 62 | v4l2_device_unregister_subdev(sd); |
53 | 63 | ||
@@ -55,19 +65,20 @@ void v4l2_device_unregister(struct v4l2_device *v4l2_dev) | |||
55 | } | 65 | } |
56 | EXPORT_SYMBOL_GPL(v4l2_device_unregister); | 66 | EXPORT_SYMBOL_GPL(v4l2_device_unregister); |
57 | 67 | ||
58 | int v4l2_device_register_subdev(struct v4l2_device *dev, struct v4l2_subdev *sd) | 68 | int v4l2_device_register_subdev(struct v4l2_device *v4l2_dev, |
69 | struct v4l2_subdev *sd) | ||
59 | { | 70 | { |
60 | /* Check for valid input */ | 71 | /* Check for valid input */ |
61 | if (dev == NULL || sd == NULL || !sd->name[0]) | 72 | if (v4l2_dev == NULL || sd == NULL || !sd->name[0]) |
62 | return -EINVAL; | 73 | return -EINVAL; |
63 | /* Warn if we apparently re-register a subdev */ | 74 | /* Warn if we apparently re-register a subdev */ |
64 | WARN_ON(sd->dev != NULL); | 75 | WARN_ON(sd->dev != NULL); |
65 | if (!try_module_get(sd->owner)) | 76 | if (!try_module_get(sd->owner)) |
66 | return -ENODEV; | 77 | return -ENODEV; |
67 | sd->dev = dev; | 78 | sd->dev = v4l2_dev; |
68 | spin_lock(&dev->lock); | 79 | spin_lock(&v4l2_dev->lock); |
69 | list_add_tail(&sd->list, &dev->subdevs); | 80 | list_add_tail(&sd->list, &v4l2_dev->subdevs); |
70 | spin_unlock(&dev->lock); | 81 | spin_unlock(&v4l2_dev->lock); |
71 | return 0; | 82 | return 0; |
72 | } | 83 | } |
73 | EXPORT_SYMBOL_GPL(v4l2_device_register_subdev); | 84 | EXPORT_SYMBOL_GPL(v4l2_device_register_subdev); |
diff --git a/include/media/v4l2-device.h b/include/media/v4l2-device.h index 55e41afd95ef..5d7146dc2913 100644 --- a/include/media/v4l2-device.h +++ b/include/media/v4l2-device.h | |||
@@ -33,7 +33,9 @@ | |||
33 | #define V4L2_DEVICE_NAME_SIZE (BUS_ID_SIZE + 16) | 33 | #define V4L2_DEVICE_NAME_SIZE (BUS_ID_SIZE + 16) |
34 | 34 | ||
35 | struct v4l2_device { | 35 | struct v4l2_device { |
36 | /* dev->driver_data points to this struct */ | 36 | /* dev->driver_data points to this struct. |
37 | Note: dev might be NULL if there is no parent device | ||
38 | as is the case with e.g. ISA devices. */ | ||
37 | struct device *dev; | 39 | struct device *dev; |
38 | /* used to keep track of the registered subdevs */ | 40 | /* used to keep track of the registered subdevs */ |
39 | struct list_head subdevs; | 41 | struct list_head subdevs; |
@@ -44,7 +46,9 @@ struct v4l2_device { | |||
44 | char name[V4L2_DEVICE_NAME_SIZE]; | 46 | char name[V4L2_DEVICE_NAME_SIZE]; |
45 | }; | 47 | }; |
46 | 48 | ||
47 | /* Initialize v4l2_dev and make dev->driver_data point to v4l2_dev */ | 49 | /* Initialize v4l2_dev and make dev->driver_data point to v4l2_dev. |
50 | dev may be NULL in rare cases (ISA devices). In that case you | ||
51 | must fill in the v4l2_dev->name field before calling this function. */ | ||
48 | int __must_check v4l2_device_register(struct device *dev, struct v4l2_device *v4l2_dev); | 52 | int __must_check v4l2_device_register(struct device *dev, struct v4l2_device *v4l2_dev); |
49 | /* Set v4l2_dev->dev->driver_data to NULL and unregister all sub-devices */ | 53 | /* Set v4l2_dev->dev->driver_data to NULL and unregister all sub-devices */ |
50 | void v4l2_device_unregister(struct v4l2_device *v4l2_dev); | 54 | void v4l2_device_unregister(struct v4l2_device *v4l2_dev); |
@@ -52,23 +56,24 @@ void v4l2_device_unregister(struct v4l2_device *v4l2_dev); | |||
52 | /* Register a subdev with a v4l2 device. While registered the subdev module | 56 | /* Register a subdev with a v4l2 device. While registered the subdev module |
53 | is marked as in-use. An error is returned if the module is no longer | 57 | is marked as in-use. An error is returned if the module is no longer |
54 | loaded when you attempt to register it. */ | 58 | loaded when you attempt to register it. */ |
55 | int __must_check v4l2_device_register_subdev(struct v4l2_device *dev, struct v4l2_subdev *sd); | 59 | int __must_check v4l2_device_register_subdev(struct v4l2_device *v4l2_dev, |
60 | struct v4l2_subdev *sd); | ||
56 | /* Unregister a subdev with a v4l2 device. Can also be called if the subdev | 61 | /* Unregister a subdev with a v4l2 device. Can also be called if the subdev |
57 | wasn't registered. In that case it will do nothing. */ | 62 | wasn't registered. In that case it will do nothing. */ |
58 | void v4l2_device_unregister_subdev(struct v4l2_subdev *sd); | 63 | void v4l2_device_unregister_subdev(struct v4l2_subdev *sd); |
59 | 64 | ||
60 | /* Iterate over all subdevs. */ | 65 | /* Iterate over all subdevs. */ |
61 | #define v4l2_device_for_each_subdev(sd, dev) \ | 66 | #define v4l2_device_for_each_subdev(sd, v4l2_dev) \ |
62 | list_for_each_entry(sd, &(dev)->subdevs, list) | 67 | list_for_each_entry(sd, &(v4l2_dev)->subdevs, list) |
63 | 68 | ||
64 | /* Call the specified callback for all subdevs matching the condition. | 69 | /* Call the specified callback for all subdevs matching the condition. |
65 | Ignore any errors. Note that you cannot add or delete a subdev | 70 | Ignore any errors. Note that you cannot add or delete a subdev |
66 | while walking the subdevs list. */ | 71 | while walking the subdevs list. */ |
67 | #define __v4l2_device_call_subdevs(dev, cond, o, f, args...) \ | 72 | #define __v4l2_device_call_subdevs(v4l2_dev, cond, o, f, args...) \ |
68 | do { \ | 73 | do { \ |
69 | struct v4l2_subdev *sd; \ | 74 | struct v4l2_subdev *sd; \ |
70 | \ | 75 | \ |
71 | list_for_each_entry(sd, &(dev)->subdevs, list) \ | 76 | list_for_each_entry(sd, &(v4l2_dev)->subdevs, list) \ |
72 | if ((cond) && sd->ops->o && sd->ops->o->f) \ | 77 | if ((cond) && sd->ops->o && sd->ops->o->f) \ |
73 | sd->ops->o->f(sd , ##args); \ | 78 | sd->ops->o->f(sd , ##args); \ |
74 | } while (0) | 79 | } while (0) |
@@ -77,12 +82,12 @@ void v4l2_device_unregister_subdev(struct v4l2_subdev *sd); | |||
77 | If the callback returns an error other than 0 or -ENOIOCTLCMD, then | 82 | If the callback returns an error other than 0 or -ENOIOCTLCMD, then |
78 | return with that error code. Note that you cannot add or delete a | 83 | return with that error code. Note that you cannot add or delete a |
79 | subdev while walking the subdevs list. */ | 84 | subdev while walking the subdevs list. */ |
80 | #define __v4l2_device_call_subdevs_until_err(dev, cond, o, f, args...) \ | 85 | #define __v4l2_device_call_subdevs_until_err(v4l2_dev, cond, o, f, args...) \ |
81 | ({ \ | 86 | ({ \ |
82 | struct v4l2_subdev *sd; \ | 87 | struct v4l2_subdev *sd; \ |
83 | long err = 0; \ | 88 | long err = 0; \ |
84 | \ | 89 | \ |
85 | list_for_each_entry(sd, &(dev)->subdevs, list) { \ | 90 | list_for_each_entry(sd, &(v4l2_dev)->subdevs, list) { \ |
86 | if ((cond) && sd->ops->o && sd->ops->o->f) \ | 91 | if ((cond) && sd->ops->o && sd->ops->o->f) \ |
87 | err = sd->ops->o->f(sd , ##args); \ | 92 | err = sd->ops->o->f(sd , ##args); \ |
88 | if (err && err != -ENOIOCTLCMD) \ | 93 | if (err && err != -ENOIOCTLCMD) \ |
@@ -94,16 +99,16 @@ void v4l2_device_unregister_subdev(struct v4l2_subdev *sd); | |||
94 | /* Call the specified callback for all subdevs matching grp_id (if 0, then | 99 | /* Call the specified callback for all subdevs matching grp_id (if 0, then |
95 | match them all). Ignore any errors. Note that you cannot add or delete | 100 | match them all). Ignore any errors. Note that you cannot add or delete |
96 | a subdev while walking the subdevs list. */ | 101 | a subdev while walking the subdevs list. */ |
97 | #define v4l2_device_call_all(dev, grpid, o, f, args...) \ | 102 | #define v4l2_device_call_all(v4l2_dev, grpid, o, f, args...) \ |
98 | __v4l2_device_call_subdevs(dev, \ | 103 | __v4l2_device_call_subdevs(v4l2_dev, \ |
99 | !(grpid) || sd->grp_id == (grpid), o, f , ##args) | 104 | !(grpid) || sd->grp_id == (grpid), o, f , ##args) |
100 | 105 | ||
101 | /* Call the specified callback for all subdevs matching grp_id (if 0, then | 106 | /* Call the specified callback for all subdevs matching grp_id (if 0, then |
102 | match them all). If the callback returns an error other than 0 or | 107 | match them all). If the callback returns an error other than 0 or |
103 | -ENOIOCTLCMD, then return with that error code. Note that you cannot | 108 | -ENOIOCTLCMD, then return with that error code. Note that you cannot |
104 | add or delete a subdev while walking the subdevs list. */ | 109 | add or delete a subdev while walking the subdevs list. */ |
105 | #define v4l2_device_call_until_err(dev, grpid, o, f, args...) \ | 110 | #define v4l2_device_call_until_err(v4l2_dev, grpid, o, f, args...) \ |
106 | __v4l2_device_call_subdevs_until_err(dev, \ | 111 | __v4l2_device_call_subdevs_until_err(v4l2_dev, \ |
107 | !(grpid) || sd->grp_id == (grpid), o, f , ##args) | 112 | !(grpid) || sd->grp_id == (grpid), o, f , ##args) |
108 | 113 | ||
109 | #endif | 114 | #endif |