include/media/v4l2-common.h

   1 /*
   2     v4l2 common internal API header
   3
   4     This header contains internal shared ioctl definitions for use by the
   5     internal low-level v4l2 drivers.
   6     Each ioctl begins with VIDIOC_INT_ to clearly mark that it is an internal
   7     define,
   8
   9     Copyright (C) 2005  Hans Verkuil <hverkuil@xs4all.nl>
  10
  11     This program is free software; you can redistribute it and/or modify
  12     it under the terms of the GNU General Public License as published by
  13     the Free Software Foundation; either version 2 of the License, or
  14     (at your option) any later version.
  15
  16     This program is distributed in the hope that it will be useful,
  17     but WITHOUT ANY WARRANTY; without even the implied warranty of
  18     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19     GNU General Public License for more details.
  20
  21     You should have received a copy of the GNU General Public License
  22     along with this program; if not, write to the Free Software
  23     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  24  */
  25
  26 #ifndef V4L2_COMMON_H_
  27 #define V4L2_COMMON_H_
  28
  29 #include <media/v4l2-dev.h>
  30
  31 /* Common printk constucts for v4l-i2c drivers. These macros create a unique
  32    prefix consisting of the driver name, the adapter number and the i2c
  33    address. */
  34 #define v4l_printk(level, name, adapter, addr, fmt, arg...) \
  35         printk(level "%s %d-%04x: " fmt, name, i2c_adapter_id(adapter), addr , ## arg)
  36
  37 #define v4l_client_printk(level, client, fmt, arg...)                       \
  38         v4l_printk(level, (client)->driver->driver.name, (client)->adapter, \
  39                    (client)->addr, fmt , ## arg)
  40
  41 #define v4l_err(client, fmt, arg...) \
  42         v4l_client_printk(KERN_ERR, client, fmt , ## arg)
  43
  44 #define v4l_warn(client, fmt, arg...) \
  45         v4l_client_printk(KERN_WARNING, client, fmt , ## arg)
  46
  47 #define v4l_info(client, fmt, arg...) \
  48         v4l_client_printk(KERN_INFO, client, fmt , ## arg)
  49
  50 /* These three macros assume that the debug level is set with a module
  51    parameter called 'debug'. */
  52 #define v4l_dbg(level, debug, client, fmt, arg...)                           \
  53         do {                                                                 \
  54                 if (debug >= (level))                                        \
  55                         v4l_client_printk(KERN_DEBUG, client, fmt , ## arg); \
  56         } while (0)
  57
  58 /* ------------------------------------------------------------------------- */
  59
  60 /* These printk constructs can be used with v4l2_device and v4l2_subdev */
  61 #define v4l2_printk(level, dev, fmt, arg...) \
  62         printk(level "%s: " fmt, (dev)->name , ## arg)
  63
  64 #define v4l2_err(dev, fmt, arg...) \
  65         v4l2_printk(KERN_ERR, dev, fmt , ## arg)
  66
  67 #define v4l2_warn(dev, fmt, arg...) \
  68         v4l2_printk(KERN_WARNING, dev, fmt , ## arg)
  69
  70 #define v4l2_info(dev, fmt, arg...) \
  71         v4l2_printk(KERN_INFO, dev, fmt , ## arg)
  72
  73 /* These three macros assume that the debug level is set with a module
  74    parameter called 'debug'. */
  75 #define v4l2_dbg(level, debug, dev, fmt, arg...)                        \
  76         do {                                                            \
  77                 if (debug >= (level))                                   \
  78                         v4l2_printk(KERN_DEBUG, dev, fmt , ## arg);     \
  79         } while (0)
  80
  81 /* ------------------------------------------------------------------------- */
  82
  83 /* Priority helper functions */
  84
  85 struct v4l2_prio_state {
  86         atomic_t prios[4];
  87 };
  88 void v4l2_prio_init(struct v4l2_prio_state *global);
  89 int v4l2_prio_change(struct v4l2_prio_state *global, enum v4l2_priority *local,
  90                      enum v4l2_priority new);
  91 void v4l2_prio_open(struct v4l2_prio_state *global, enum v4l2_priority *local);
  92 void v4l2_prio_close(struct v4l2_prio_state *global, enum v4l2_priority local);
  93 enum v4l2_priority v4l2_prio_max(struct v4l2_prio_state *global);
  94 int v4l2_prio_check(struct v4l2_prio_state *global, enum v4l2_priority local);
  95
  96 /* ------------------------------------------------------------------------- */
  97
  98 /* Control helper functions */
  99
 100 int v4l2_ctrl_check(struct v4l2_ext_control *ctrl, struct v4l2_queryctrl *qctrl,
 101                 const char * const *menu_items);
 102 const char *v4l2_ctrl_get_name(u32 id);
 103 const char * const *v4l2_ctrl_get_menu(u32 id);
 104 int v4l2_ctrl_query_fill(struct v4l2_queryctrl *qctrl, s32 min, s32 max, s32 step, s32 def);
 105 int v4l2_ctrl_query_menu(struct v4l2_querymenu *qmenu,
 106                 struct v4l2_queryctrl *qctrl, const char * const *menu_items);
 107 #define V4L2_CTRL_MENU_IDS_END (0xffffffff)
 108 int v4l2_ctrl_query_menu_valid_items(struct v4l2_querymenu *qmenu, const u32 *ids);
 109
 110 /* Note: ctrl_classes points to an array of u32 pointers. Each u32 array is a
 111    0-terminated array of control IDs. Each array must be sorted low to high
 112    and belong to the same control class. The array of u32 pointers must also
 113    be sorted, from low class IDs to high class IDs. */
 114 u32 v4l2_ctrl_next(const u32 * const *ctrl_classes, u32 id);
 115
 116 /* ------------------------------------------------------------------------- */
 117
 118 /* Register/chip ident helper function */
 119
 120 struct i2c_client; /* forward reference */
 121 int v4l2_chip_match_i2c_client(struct i2c_client *c, const struct v4l2_dbg_match *match);
 122 int v4l2_chip_ident_i2c_client(struct i2c_client *c, struct v4l2_dbg_chip_ident *chip,
 123                 u32 ident, u32 revision);
 124 int v4l2_chip_match_host(const struct v4l2_dbg_match *match);
 125
 126 /* ------------------------------------------------------------------------- */
 127
 128 /* I2C Helper functions */
 129
 130 struct i2c_driver;
 131 struct i2c_adapter;
 132 struct i2c_client;
 133 struct i2c_device_id;
 134 struct v4l2_device;
 135 struct v4l2_subdev;
 136 struct v4l2_subdev_ops;
 137
 138
 139 /* Load an i2c module and return an initialized v4l2_subdev struct.
 140    The client_type argument is the name of the chip that's on the adapter. */
 141 struct v4l2_subdev *v4l2_i2c_new_subdev(struct v4l2_device *v4l2_dev,
 142                 struct i2c_adapter *adapter, const char *client_type,
 143                 u8 addr, const unsigned short *probe_addrs);
 144
 145 struct i2c_board_info;
 146
 147 struct v4l2_subdev *v4l2_i2c_new_subdev_board(struct v4l2_device *v4l2_dev,
 148                 struct i2c_adapter *adapter, struct i2c_board_info *info,
 149                 const unsigned short *probe_addrs);
 150
 151 /* Initialize an v4l2_subdev with data from an i2c_client struct */
 152 void v4l2_i2c_subdev_init(struct v4l2_subdev *sd, struct i2c_client *client,
 153                 const struct v4l2_subdev_ops *ops);
 154 /* Return i2c client address of v4l2_subdev. */
 155 unsigned short v4l2_i2c_subdev_addr(struct v4l2_subdev *sd);
 156
 157 enum v4l2_i2c_tuner_type {
 158         ADDRS_RADIO,    /* Radio tuner addresses */
 159         ADDRS_DEMOD,    /* Demod tuner addresses */
 160         ADDRS_TV,       /* TV tuner addresses */
 161         /* TV tuner addresses if demod is present, this excludes
 162            addresses used by the demodulator from the list of
 163            candidates. */
 164         ADDRS_TV_WITH_DEMOD,
 165 };
 166 /* Return a list of I2C tuner addresses to probe. Use only if the tuner
 167    addresses are unknown. */
 168 const unsigned short *v4l2_i2c_tuner_addrs(enum v4l2_i2c_tuner_type type);
 169
 170 /* ------------------------------------------------------------------------- */
 171
 172 /* SPI Helper functions */
 173 #if defined(CONFIG_SPI)
 174
 175 #include <linux/spi/spi.h>
 176
 177 struct spi_device;
 178
 179 /* Load an spi module and return an initialized v4l2_subdev struct.
 180    The client_type argument is the name of the chip that's on the adapter. */
 181 struct v4l2_subdev *v4l2_spi_new_subdev(struct v4l2_device *v4l2_dev,
 182                 struct spi_master *master, struct spi_board_info *info);
 183
 184 /* Initialize an v4l2_subdev with data from an spi_device struct */
 185 void v4l2_spi_subdev_init(struct v4l2_subdev *sd, struct spi_device *spi,
 186                 const struct v4l2_subdev_ops *ops);
 187 #endif
 188
 189 /* ------------------------------------------------------------------------- */
 190
 191 /* Note: these remaining ioctls/structs should be removed as well, but they are
 192    still used in tuner-simple.c (TUNER_SET_CONFIG), cx18/ivtv (RESET) and
 193    v4l2-int-device.h (v4l2_routing). To remove these ioctls some more cleanup
 194    is needed in those modules. */
 195
 196 /* s_config */
 197 struct v4l2_priv_tun_config {
 198         int tuner;
 199         void *priv;
 200 };
 201 #define TUNER_SET_CONFIG           _IOW('d', 92, struct v4l2_priv_tun_config)
 202
 203 #define VIDIOC_INT_RESET                _IOW ('d', 102, u32)
 204
 205 struct v4l2_routing {
 206         u32 input;
 207         u32 output;
 208 };
 209
 210 /* ------------------------------------------------------------------------- */
 211
 212 /* Miscellaneous helper functions */
 213
 214 void v4l_bound_align_image(unsigned int *w, unsigned int wmin,
 215                            unsigned int wmax, unsigned int walign,
 216                            unsigned int *h, unsigned int hmin,
 217                            unsigned int hmax, unsigned int halign,
 218                            unsigned int salign);
 219 int v4l_fill_dv_preset_info(u32 preset, struct v4l2_dv_enum_preset *info);
 220
 221 struct v4l2_discrete_probe {
 222         const struct v4l2_frmsize_discrete      *sizes;
 223         int                                     num_sizes;
 224 };
 225
 226 const struct v4l2_frmsize_discrete *v4l2_find_nearest_format(
 227                 const struct v4l2_discrete_probe *probe,
 228                 s32 width, s32 height);
 229
 230 #endif /* V4L2_COMMON_H_ */