Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 | /*
V4L2 device support header.
Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _V4L2_DEVICE_H
#define _V4L2_DEVICE_H
#include <media/media-device.h>
#include <media/v4l2-subdev.h>
#include <media/v4l2-dev.h>
/* Each instance of a V4L2 device should create the v4l2_device struct,
either stand-alone or embedded in a larger struct.
It allows easy access to sub-devices (see v4l2-subdev.h) and provides
basic V4L2 device-level support.
*/
#define V4L2_DEVICE_NAME_SIZE (20 + 16)
struct v4l2_ctrl_handler;
struct v4l2_device {
/* dev->driver_data points to this struct.
Note: dev might be NULL if there is no parent device
as is the case with e.g. ISA devices. */
struct device *dev;
#if defined(CONFIG_MEDIA_CONTROLLER)
struct media_device *mdev;
#endif
/* used to keep track of the registered subdevs */
struct list_head subdevs;
/* lock this struct; can be used by the driver as well if this
struct is embedded into a larger struct. */
spinlock_t lock;
/* unique device name, by default the driver name + bus ID */
char name[V4L2_DEVICE_NAME_SIZE];
/* notify callback called by some sub-devices. */
void (*notify)(struct v4l2_subdev *sd,
unsigned int notification, void *arg);
/* The control handler. May be NULL. */
struct v4l2_ctrl_handler *ctrl_handler;
/* Device's priority state */
struct v4l2_prio_state prio;
/* Keep track of the references to this struct. */
struct kref ref;
/* Release function that is called when the ref count goes to 0. */
void (*release)(struct v4l2_device *v4l2_dev);
};
static inline void v4l2_device_get(struct v4l2_device *v4l2_dev)
{
kref_get(&v4l2_dev->ref);
}
int v4l2_device_put(struct v4l2_device *v4l2_dev);
/* Initialize v4l2_dev and make dev->driver_data point to v4l2_dev.
dev may be NULL in rare cases (ISA devices). In that case you
must fill in the v4l2_dev->name field before calling this function. */
int __must_check v4l2_device_register(struct device *dev, struct v4l2_device *v4l2_dev);
/* Optional function to initialize the name field of struct v4l2_device using
the driver name and a driver-global atomic_t instance.
This function will increment the instance counter and returns the instance
value used in the name.
Example:
static atomic_t drv_instance = ATOMIC_INIT(0);
...
instance = v4l2_device_set_name(&v4l2_dev, "foo", &drv_instance);
The first time this is called the name field will be set to foo0 and
this function returns 0. If the name ends with a digit (e.g. cx18),
then the name will be set to cx18-0 since cx180 looks really odd. */
int v4l2_device_set_name(struct v4l2_device *v4l2_dev, const char *basename,
atomic_t *instance);
/* Set v4l2_dev->dev to NULL. Call when the USB parent disconnects.
Since the parent disappears this ensures that v4l2_dev doesn't have an
invalid parent pointer. */
void v4l2_device_disconnect(struct v4l2_device *v4l2_dev);
/* Unregister all sub-devices and any other resources related to v4l2_dev. */
void v4l2_device_unregister(struct v4l2_device *v4l2_dev);
/* Register a subdev with a v4l2 device. While registered the subdev module
is marked as in-use. An error is returned if the module is no longer
loaded when you attempt to register it. */
int __must_check v4l2_device_register_subdev(struct v4l2_device *v4l2_dev,
struct v4l2_subdev *sd);
/* Unregister a subdev with a v4l2 device. Can also be called if the subdev
wasn't registered. In that case it will do nothing. */
void v4l2_device_unregister_subdev(struct v4l2_subdev *sd);
/* Register device nodes for all subdev of the v4l2 device that are marked with
* the V4L2_SUBDEV_FL_HAS_DEVNODE flag.
*/
int __must_check
v4l2_device_register_subdev_nodes(struct v4l2_device *v4l2_dev);
/* Send a notification to v4l2_device. */
static inline void v4l2_subdev_notify(struct v4l2_subdev *sd,
unsigned int notification, void *arg)
{
if (sd && sd->v4l2_dev && sd->v4l2_dev->notify)
sd->v4l2_dev->notify(sd, notification, arg);
}
/* Iterate over all subdevs. */
#define v4l2_device_for_each_subdev(sd, v4l2_dev) \
list_for_each_entry(sd, &(v4l2_dev)->subdevs, list)
/* Call the specified callback for all subdevs matching the condition.
Ignore any errors. Note that you cannot add or delete a subdev
while walking the subdevs list. */
#define __v4l2_device_call_subdevs_p(v4l2_dev, sd, cond, o, f, args...) \
do { \
list_for_each_entry((sd), &(v4l2_dev)->subdevs, list) \
if ((cond) && (sd)->ops->o && (sd)->ops->o->f) \
(sd)->ops->o->f((sd) , ##args); \
} while (0)
#define __v4l2_device_call_subdevs(v4l2_dev, cond, o, f, args...) \
do { \
struct v4l2_subdev *__sd; \
\
__v4l2_device_call_subdevs_p(v4l2_dev, __sd, cond, o, \
f , ##args); \
} while (0)
/* Call the specified callback for all subdevs matching the condition.
If the callback returns an error other than 0 or -ENOIOCTLCMD, then
return with that error code. Note that you cannot add or delete a
subdev while walking the subdevs list. */
#define __v4l2_device_call_subdevs_until_err_p(v4l2_dev, sd, cond, o, f, args...) \
({ \
long __err = 0; \
\
list_for_each_entry((sd), &(v4l2_dev)->subdevs, list) { \
if ((cond) && (sd)->ops->o && (sd)->ops->o->f) \
__err = (sd)->ops->o->f((sd) , ##args); \
if (__err && __err != -ENOIOCTLCMD) \
break; \
} \
(__err == -ENOIOCTLCMD) ? 0 : __err; \
})
#define __v4l2_device_call_subdevs_until_err(v4l2_dev, cond, o, f, args...) \
({ \
struct v4l2_subdev *__sd; \
__v4l2_device_call_subdevs_until_err_p(v4l2_dev, __sd, cond, o, \
f , ##args); \
})
/* Call the specified callback for all subdevs matching grp_id (if 0, then
match them all). Ignore any errors. Note that you cannot add or delete
a subdev while walking the subdevs list. */
#define v4l2_device_call_all(v4l2_dev, grpid, o, f, args...) \
do { \
struct v4l2_subdev *__sd; \
\
__v4l2_device_call_subdevs_p(v4l2_dev, __sd, \
!(grpid) || __sd->grp_id == (grpid), o, f , \
##args); \
} while (0)
/* Call the specified callback for all subdevs matching grp_id (if 0, then
match them all). If the callback returns an error other than 0 or
-ENOIOCTLCMD, then return with that error code. Note that you cannot
add or delete a subdev while walking the subdevs list. */
#define v4l2_device_call_until_err(v4l2_dev, grpid, o, f, args...) \
({ \
struct v4l2_subdev *__sd; \
__v4l2_device_call_subdevs_until_err_p(v4l2_dev, __sd, \
!(grpid) || __sd->grp_id == (grpid), o, f , \
##args); \
})
/*
* Call the specified callback for all subdevs where grp_id & grpmsk != 0
* (if grpmsk == `0, then match them all). Ignore any errors. Note that you
* cannot add or delete a subdev while walking the subdevs list.
*/
#define v4l2_device_mask_call_all(v4l2_dev, grpmsk, o, f, args...) \
do { \
struct v4l2_subdev *__sd; \
\
__v4l2_device_call_subdevs_p(v4l2_dev, __sd, \
!(grpmsk) || (__sd->grp_id & (grpmsk)), o, f , \
##args); \
} while (0)
/*
* Call the specified callback for all subdevs where grp_id & grpmsk != 0
* (if grpmsk == `0, then match them all). If the callback returns an error
* other than 0 or -ENOIOCTLCMD, then return with that error code. Note that
* you cannot add or delete a subdev while walking the subdevs list.
*/
#define v4l2_device_mask_call_until_err(v4l2_dev, grpmsk, o, f, args...) \
({ \
struct v4l2_subdev *__sd; \
__v4l2_device_call_subdevs_until_err_p(v4l2_dev, __sd, \
!(grpmsk) || (__sd->grp_id & (grpmsk)), o, f , \
##args); \
})
/*
* Does any subdev with matching grpid (or all if grpid == 0) has the given
* op?
*/
#define v4l2_device_has_op(v4l2_dev, grpid, o, f) \
({ \
struct v4l2_subdev *__sd; \
bool __result = false; \
list_for_each_entry(__sd, &(v4l2_dev)->subdevs, list) { \
if ((grpid) && __sd->grp_id != (grpid)) \
continue; \
if (v4l2_subdev_has_op(__sd, o, f)) { \
__result = true; \
break; \
} \
} \
__result; \
})
/*
* Does any subdev with matching grpmsk (or all if grpmsk == 0) has the given
* op?
*/
#define v4l2_device_mask_has_op(v4l2_dev, grpmsk, o, f) \
({ \
struct v4l2_subdev *__sd; \
bool __result = false; \
list_for_each_entry(__sd, &(v4l2_dev)->subdevs, list) { \
if ((grpmsk) && !(__sd->grp_id & (grpmsk))) \
continue; \
if (v4l2_subdev_has_op(__sd, o, f)) { \
__result = true; \
break; \
} \
} \
__result; \
})
#endif
|