Root/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
85struct v4l2_prio_state {
86    atomic_t prios[4];
87};
88int v4l2_prio_init(struct v4l2_prio_state *global);
89int v4l2_prio_change(struct v4l2_prio_state *global, enum v4l2_priority *local,
90             enum v4l2_priority new);
91int v4l2_prio_open(struct v4l2_prio_state *global, enum v4l2_priority *local);
92int v4l2_prio_close(struct v4l2_prio_state *global, enum v4l2_priority *local);
93enum v4l2_priority v4l2_prio_max(struct v4l2_prio_state *global);
94int v4l2_prio_check(struct v4l2_prio_state *global, enum v4l2_priority *local);
95
96/* ------------------------------------------------------------------------- */
97
98/* Control helper functions */
99
100int v4l2_ctrl_check(struct v4l2_ext_control *ctrl, struct v4l2_queryctrl *qctrl,
101        const char **menu_items);
102const char *v4l2_ctrl_get_name(u32 id);
103const char **v4l2_ctrl_get_menu(u32 id);
104int v4l2_ctrl_query_fill(struct v4l2_queryctrl *qctrl, s32 min, s32 max, s32 step, s32 def);
105int v4l2_ctrl_query_menu(struct v4l2_querymenu *qmenu,
106        struct v4l2_queryctrl *qctrl, const char **menu_items);
107#define V4L2_CTRL_MENU_IDS_END (0xffffffff)
108int 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. */
114u32 v4l2_ctrl_next(const u32 * const *ctrl_classes, u32 id);
115
116/* ------------------------------------------------------------------------- */
117
118/* Register/chip ident helper function */
119
120struct i2c_client; /* forward reference */
121int v4l2_chip_match_i2c_client(struct i2c_client *c, const struct v4l2_dbg_match *match);
122int v4l2_chip_ident_i2c_client(struct i2c_client *c, struct v4l2_dbg_chip_ident *chip,
123        u32 ident, u32 revision);
124int v4l2_chip_match_host(const struct v4l2_dbg_match *match);
125
126/* ------------------------------------------------------------------------- */
127
128/* I2C Helper functions */
129
130struct i2c_driver;
131struct i2c_adapter;
132struct i2c_client;
133struct i2c_device_id;
134struct v4l2_device;
135struct v4l2_subdev;
136struct v4l2_subdev_ops;
137
138
139/* Load an i2c module and return an initialized v4l2_subdev struct.
140   Only call request_module if module_name != NULL.
141   The client_type argument is the name of the chip that's on the adapter. */
142struct v4l2_subdev *v4l2_i2c_new_subdev_cfg(struct v4l2_device *v4l2_dev,
143        struct i2c_adapter *adapter,
144        const char *module_name, const char *client_type,
145        int irq, void *platform_data,
146        u8 addr, const unsigned short *probe_addrs);
147
148/* Load an i2c module and return an initialized v4l2_subdev struct.
149   Only call request_module if module_name != NULL.
150   The client_type argument is the name of the chip that's on the adapter. */
151static inline struct v4l2_subdev *v4l2_i2c_new_subdev(struct v4l2_device *v4l2_dev,
152        struct i2c_adapter *adapter,
153        const char *module_name, const char *client_type,
154        u8 addr, const unsigned short *probe_addrs)
155{
156    return v4l2_i2c_new_subdev_cfg(v4l2_dev, adapter, module_name,
157                client_type, 0, NULL, addr, probe_addrs);
158}
159
160struct i2c_board_info;
161
162struct v4l2_subdev *v4l2_i2c_new_subdev_board(struct v4l2_device *v4l2_dev,
163        struct i2c_adapter *adapter, const char *module_name,
164        struct i2c_board_info *info, const unsigned short *probe_addrs);
165
166/* Initialize an v4l2_subdev with data from an i2c_client struct */
167void v4l2_i2c_subdev_init(struct v4l2_subdev *sd, struct i2c_client *client,
168        const struct v4l2_subdev_ops *ops);
169/* Return i2c client address of v4l2_subdev. */
170unsigned short v4l2_i2c_subdev_addr(struct v4l2_subdev *sd);
171
172enum v4l2_i2c_tuner_type {
173    ADDRS_RADIO, /* Radio tuner addresses */
174    ADDRS_DEMOD, /* Demod tuner addresses */
175    ADDRS_TV, /* TV tuner addresses */
176    /* TV tuner addresses if demod is present, this excludes
177       addresses used by the demodulator from the list of
178       candidates. */
179    ADDRS_TV_WITH_DEMOD,
180};
181/* Return a list of I2C tuner addresses to probe. Use only if the tuner
182   addresses are unknown. */
183const unsigned short *v4l2_i2c_tuner_addrs(enum v4l2_i2c_tuner_type type);
184
185/* ------------------------------------------------------------------------- */
186
187/* Note: these remaining ioctls/structs should be removed as well, but they are
188   still used in tuner-simple.c (TUNER_SET_CONFIG), cx18/ivtv (RESET) and
189   v4l2-int-device.h (v4l2_routing). To remove these ioctls some more cleanup
190   is needed in those modules. */
191
192/* s_config */
193struct v4l2_priv_tun_config {
194    int tuner;
195    void *priv;
196};
197#define TUNER_SET_CONFIG _IOW('d', 92, struct v4l2_priv_tun_config)
198
199#define VIDIOC_INT_RESET _IOW ('d', 102, u32)
200
201struct v4l2_routing {
202    u32 input;
203    u32 output;
204};
205
206/* ------------------------------------------------------------------------- */
207
208/* Miscellaneous helper functions */
209
210void v4l_bound_align_image(unsigned int *w, unsigned int wmin,
211               unsigned int wmax, unsigned int walign,
212               unsigned int *h, unsigned int hmin,
213               unsigned int hmax, unsigned int halign,
214               unsigned int salign);
215
216#endif /* V4L2_COMMON_H_ */
217

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