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| 1 | /* |
| 2 | V4L2 device support header. |
| 3 | |
| 4 | Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl> |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 2 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program; if not, write to the Free Software |
| 18 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 | */ |
| 20 | |
| 21 | #ifndef _V4L2_DEVICE_H |
| 22 | #define _V4L2_DEVICE_H |
| 23 | |
| 24 | #include <media/v4l2-subdev.h> |
| 25 | |
| 26 | /* Each instance of a V4L2 device should create the v4l2_device struct, |
| 27 | either stand-alone or embedded in a larger struct. |
| 28 | |
| 29 | It allows easy access to sub-devices (see v4l2-subdev.h) and provides |
| 30 | basic V4L2 device-level support. |
| 31 | */ |
| 32 | |
| 33 | #define V4L2_DEVICE_NAME_SIZE (20 + 16) |
| 34 | |
| 35 | struct v4l2_device { |
| 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. */ |
| 39 | struct device *dev; |
| 40 | /* used to keep track of the registered subdevs */ |
| 41 | struct list_head subdevs; |
| 42 | /* lock this struct; can be used by the driver as well if this |
| 43 | struct is embedded into a larger struct. */ |
| 44 | spinlock_t lock; |
| 45 | /* unique device name, by default the driver name + bus ID */ |
| 46 | char name[V4L2_DEVICE_NAME_SIZE]; |
| 47 | /* notify callback called by some sub-devices. */ |
| 48 | void (*notify)(struct v4l2_subdev *sd, |
| 49 | unsigned int notification, void *arg); |
| 50 | }; |
| 51 | |
| 52 | /* Initialize v4l2_dev and make dev->driver_data point to v4l2_dev. |
| 53 | dev may be NULL in rare cases (ISA devices). In that case you |
| 54 | must fill in the v4l2_dev->name field before calling this function. */ |
| 55 | int __must_check v4l2_device_register(struct device *dev, struct v4l2_device *v4l2_dev); |
| 56 | |
| 57 | /* Optional function to initialize the name field of struct v4l2_device using |
| 58 | the driver name and a driver-global atomic_t instance. |
| 59 | This function will increment the instance counter and returns the instance |
| 60 | value used in the name. |
| 61 | |
| 62 | Example: |
| 63 | |
| 64 | static atomic_t drv_instance = ATOMIC_INIT(0); |
| 65 | |
| 66 | ... |
| 67 | |
| 68 | instance = v4l2_device_set_name(&v4l2_dev, "foo", &drv_instance); |
| 69 | |
| 70 | The first time this is called the name field will be set to foo0 and |
| 71 | this function returns 0. If the name ends with a digit (e.g. cx18), |
| 72 | then the name will be set to cx18-0 since cx180 looks really odd. */ |
| 73 | int v4l2_device_set_name(struct v4l2_device *v4l2_dev, const char *basename, |
| 74 | atomic_t *instance); |
| 75 | |
| 76 | /* Set v4l2_dev->dev to NULL. Call when the USB parent disconnects. |
| 77 | Since the parent disappears this ensures that v4l2_dev doesn't have an |
| 78 | invalid parent pointer. */ |
| 79 | void v4l2_device_disconnect(struct v4l2_device *v4l2_dev); |
| 80 | |
| 81 | /* Unregister all sub-devices and any other resources related to v4l2_dev. */ |
| 82 | void v4l2_device_unregister(struct v4l2_device *v4l2_dev); |
| 83 | |
| 84 | /* Register a subdev with a v4l2 device. While registered the subdev module |
| 85 | is marked as in-use. An error is returned if the module is no longer |
| 86 | loaded when you attempt to register it. */ |
| 87 | int __must_check v4l2_device_register_subdev(struct v4l2_device *v4l2_dev, |
| 88 | struct v4l2_subdev *sd); |
| 89 | /* Unregister a subdev with a v4l2 device. Can also be called if the subdev |
| 90 | wasn't registered. In that case it will do nothing. */ |
| 91 | void v4l2_device_unregister_subdev(struct v4l2_subdev *sd); |
| 92 | |
| 93 | /* Iterate over all subdevs. */ |
| 94 | #define v4l2_device_for_each_subdev(sd, v4l2_dev) \ |
| 95 | list_for_each_entry(sd, &(v4l2_dev)->subdevs, list) |
| 96 | |
| 97 | /* Call the specified callback for all subdevs matching the condition. |
| 98 | Ignore any errors. Note that you cannot add or delete a subdev |
| 99 | while walking the subdevs list. */ |
| 100 | #define __v4l2_device_call_subdevs(v4l2_dev, cond, o, f, args...) \ |
| 101 | do { \ |
| 102 | struct v4l2_subdev *sd; \ |
| 103 | \ |
| 104 | list_for_each_entry(sd, &(v4l2_dev)->subdevs, list) \ |
| 105 | if ((cond) && sd->ops->o && sd->ops->o->f) \ |
| 106 | sd->ops->o->f(sd , ##args); \ |
| 107 | } while (0) |
| 108 | |
| 109 | /* Call the specified callback for all subdevs matching the condition. |
| 110 | If the callback returns an error other than 0 or -ENOIOCTLCMD, then |
| 111 | return with that error code. Note that you cannot add or delete a |
| 112 | subdev while walking the subdevs list. */ |
| 113 | #define __v4l2_device_call_subdevs_until_err(v4l2_dev, cond, o, f, args...) \ |
| 114 | ({ \ |
| 115 | struct v4l2_subdev *sd; \ |
| 116 | long err = 0; \ |
| 117 | \ |
| 118 | list_for_each_entry(sd, &(v4l2_dev)->subdevs, list) { \ |
| 119 | if ((cond) && sd->ops->o && sd->ops->o->f) \ |
| 120 | err = sd->ops->o->f(sd , ##args); \ |
| 121 | if (err && err != -ENOIOCTLCMD) \ |
| 122 | break; \ |
| 123 | } \ |
| 124 | (err == -ENOIOCTLCMD) ? 0 : err; \ |
| 125 | }) |
| 126 | |
| 127 | /* Call the specified callback for all subdevs matching grp_id (if 0, then |
| 128 | match them all). Ignore any errors. Note that you cannot add or delete |
| 129 | a subdev while walking the subdevs list. */ |
| 130 | #define v4l2_device_call_all(v4l2_dev, grpid, o, f, args...) \ |
| 131 | __v4l2_device_call_subdevs(v4l2_dev, \ |
| 132 | !(grpid) || sd->grp_id == (grpid), o, f , ##args) |
| 133 | |
| 134 | /* Call the specified callback for all subdevs matching grp_id (if 0, then |
| 135 | match them all). If the callback returns an error other than 0 or |
| 136 | -ENOIOCTLCMD, then return with that error code. Note that you cannot |
| 137 | add or delete a subdev while walking the subdevs list. */ |
| 138 | #define v4l2_device_call_until_err(v4l2_dev, grpid, o, f, args...) \ |
| 139 | __v4l2_device_call_subdevs_until_err(v4l2_dev, \ |
| 140 | !(grpid) || sd->grp_id == (grpid), o, f , ##args) |
| 141 | |
| 142 | #endif |
| 143 |
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