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Linux/include/media/v4l2-common.h

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  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)->dev.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 /* Add a version of v4l_dbg to be used on drivers using dev_foo() macros */
 59 #define dev_dbg_lvl(__dev, __level, __debug, __fmt, __arg...)           \
 60         do {                                                            \
 61                 if (__debug >= (__level))                               \
 62                         dev_printk(KERN_DEBUG, __dev, __fmt, ##__arg);  \
 63         } while (0)
 64 
 65 /* ------------------------------------------------------------------------- */
 66 
 67 /* These printk constructs can be used with v4l2_device and v4l2_subdev */
 68 #define v4l2_printk(level, dev, fmt, arg...) \
 69         printk(level "%s: " fmt, (dev)->name , ## arg)
 70 
 71 #define v4l2_err(dev, fmt, arg...) \
 72         v4l2_printk(KERN_ERR, dev, fmt , ## arg)
 73 
 74 #define v4l2_warn(dev, fmt, arg...) \
 75         v4l2_printk(KERN_WARNING, dev, fmt , ## arg)
 76 
 77 #define v4l2_info(dev, fmt, arg...) \
 78         v4l2_printk(KERN_INFO, dev, fmt , ## arg)
 79 
 80 /* These three macros assume that the debug level is set with a module
 81    parameter called 'debug'. */
 82 #define v4l2_dbg(level, debug, dev, fmt, arg...)                        \
 83         do {                                                            \
 84                 if (debug >= (level))                                   \
 85                         v4l2_printk(KERN_DEBUG, dev, fmt , ## arg);     \
 86         } while (0)
 87 
 88 /**
 89  * v4l2_ctrl_query_fill- Fill in a struct v4l2_queryctrl
 90  *
 91  * @qctrl: pointer to the &struct v4l2_queryctrl to be filled
 92  * @min: minimum value for the control
 93  * @max: maximum value for the control
 94  * @step: control step
 95  * @def: default value for the control
 96  *
 97  * Fills the &struct v4l2_queryctrl fields for the query control.
 98  *
 99  * .. note::
100  *
101  *    This function assumes that the @qctrl->id field is filled.
102  *
103  * Returns -EINVAL if the control is not known by the V4L2 core, 0 on success.
104  */
105 
106 int v4l2_ctrl_query_fill(struct v4l2_queryctrl *qctrl,
107                          s32 min, s32 max, s32 step, s32 def);
108 
109 /* ------------------------------------------------------------------------- */
110 
111 /* I2C Helper functions */
112 
113 struct i2c_driver;
114 struct i2c_adapter;
115 struct i2c_client;
116 struct i2c_device_id;
117 struct v4l2_device;
118 struct v4l2_subdev;
119 struct v4l2_subdev_ops;
120 
121 /**
122  * v4l2_i2c_new_subdev - Load an i2c module and return an initialized
123  *      &struct v4l2_subdev.
124  *
125  * @v4l2_dev: pointer to &struct v4l2_device
126  * @adapter: pointer to struct i2c_adapter
127  * @client_type:  name of the chip that's on the adapter.
128  * @addr: I2C address. If zero, it will use @probe_addrs
129  * @probe_addrs: array with a list of address. The last entry at such
130  *      array should be %I2C_CLIENT_END.
131  *
132  * returns a &struct v4l2_subdev pointer.
133  */
134 struct v4l2_subdev *v4l2_i2c_new_subdev(struct v4l2_device *v4l2_dev,
135                 struct i2c_adapter *adapter, const char *client_type,
136                 u8 addr, const unsigned short *probe_addrs);
137 
138 struct i2c_board_info;
139 
140 /**
141  * v4l2_i2c_new_subdev_board - Load an i2c module and return an initialized
142  *      &struct v4l2_subdev.
143  *
144  * @v4l2_dev: pointer to &struct v4l2_device
145  * @adapter: pointer to struct i2c_adapter
146  * @info: pointer to struct i2c_board_info used to replace the irq,
147  *       platform_data and addr arguments.
148  * @probe_addrs: array with a list of address. The last entry at such
149  *      array should be %I2C_CLIENT_END.
150  *
151  * returns a &struct v4l2_subdev pointer.
152  */
153 struct v4l2_subdev *v4l2_i2c_new_subdev_board(struct v4l2_device *v4l2_dev,
154                 struct i2c_adapter *adapter, struct i2c_board_info *info,
155                 const unsigned short *probe_addrs);
156 
157 /**
158  * v4l2_i2c_subdev_init - Initializes a &struct v4l2_subdev with data from
159  *      an i2c_client struct.
160  *
161  * @sd: pointer to &struct v4l2_subdev
162  * @client: pointer to struct i2c_client
163  * @ops: pointer to &struct v4l2_subdev_ops
164  */
165 void v4l2_i2c_subdev_init(struct v4l2_subdev *sd, struct i2c_client *client,
166                 const struct v4l2_subdev_ops *ops);
167 
168 /**
169  * v4l2_i2c_subdev_addr - returns i2c client address of &struct v4l2_subdev.
170  *
171  * @sd: pointer to &struct v4l2_subdev
172  *
173  * Returns the address of an I2C sub-device
174  */
175 unsigned short v4l2_i2c_subdev_addr(struct v4l2_subdev *sd);
176 
177 enum v4l2_i2c_tuner_type {
178         ADDRS_RADIO,    /* Radio tuner addresses */
179         ADDRS_DEMOD,    /* Demod tuner addresses */
180         ADDRS_TV,       /* TV tuner addresses */
181         /* TV tuner addresses if demod is present, this excludes
182            addresses used by the demodulator from the list of
183            candidates. */
184         ADDRS_TV_WITH_DEMOD,
185 };
186 /* Return a list of I2C tuner addresses to probe. Use only if the tuner
187    addresses are unknown. */
188 const unsigned short *v4l2_i2c_tuner_addrs(enum v4l2_i2c_tuner_type type);
189 
190 /* ------------------------------------------------------------------------- */
191 
192 /* SPI Helper functions */
193 #if defined(CONFIG_SPI)
194 
195 #include <linux/spi/spi.h>
196 
197 struct spi_device;
198 
199 /**
200  *  v4l2_spi_new_subdev - Load an spi module and return an initialized
201  *      &struct v4l2_subdev.
202  *
203  *
204  * @v4l2_dev: pointer to &struct v4l2_device.
205  * @master: pointer to struct spi_master.
206  * @info: pointer to struct spi_board_info.
207  *
208  * returns a &struct v4l2_subdev pointer.
209  */
210 struct v4l2_subdev *v4l2_spi_new_subdev(struct v4l2_device *v4l2_dev,
211                 struct spi_master *master, struct spi_board_info *info);
212 
213 /**
214  * v4l2_spi_subdev_init - Initialize a v4l2_subdev with data from an
215  *      spi_device struct.
216  *
217  * @sd: pointer to &struct v4l2_subdev
218  * @spi: pointer to struct spi_device.
219  * @ops: pointer to &struct v4l2_subdev_ops
220  */
221 void v4l2_spi_subdev_init(struct v4l2_subdev *sd, struct spi_device *spi,
222                 const struct v4l2_subdev_ops *ops);
223 #endif
224 
225 /* ------------------------------------------------------------------------- */
226 
227 /* Note: these remaining ioctls/structs should be removed as well, but they are
228    still used in tuner-simple.c (TUNER_SET_CONFIG), cx18/ivtv (RESET) and
229    v4l2-int-device.h (v4l2_routing). To remove these ioctls some more cleanup
230    is needed in those modules. */
231 
232 /* s_config */
233 struct v4l2_priv_tun_config {
234         int tuner;
235         void *priv;
236 };
237 #define TUNER_SET_CONFIG           _IOW('d', 92, struct v4l2_priv_tun_config)
238 
239 #define VIDIOC_INT_RESET                _IOW ('d', 102, u32)
240 
241 struct v4l2_routing {
242         u32 input;
243         u32 output;
244 };
245 
246 /* ------------------------------------------------------------------------- */
247 
248 /* Miscellaneous helper functions */
249 
250 void v4l_bound_align_image(unsigned int *w, unsigned int wmin,
251                            unsigned int wmax, unsigned int walign,
252                            unsigned int *h, unsigned int hmin,
253                            unsigned int hmax, unsigned int halign,
254                            unsigned int salign);
255 
256 struct v4l2_discrete_probe {
257         const struct v4l2_frmsize_discrete      *sizes;
258         int                                     num_sizes;
259 };
260 
261 const struct v4l2_frmsize_discrete *v4l2_find_nearest_format(
262                 const struct v4l2_discrete_probe *probe,
263                 s32 width, s32 height);
264 
265 void v4l2_get_timestamp(struct timeval *tv);
266 
267 #endif /* V4L2_COMMON_H_ */
268 

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