xref: /openbmc/linux/include/media/v4l2-common.h (revision b6dcefde)
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 int 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 int v4l2_prio_open(struct v4l2_prio_state *global, enum v4l2_priority *local);
92 int 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 **menu_items);
102 const char *v4l2_ctrl_get_name(u32 id);
103 const char **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 **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    Only call request_module if module_name != NULL.
141    The client_type argument is the name of the chip that's on the adapter. */
142 struct 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. */
151 static 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 
160 struct i2c_board_info;
161 
162 struct 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 */
167 void 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. */
170 unsigned short v4l2_i2c_subdev_addr(struct v4l2_subdev *sd);
171 
172 enum 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. */
183 const 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 */
193 struct 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 
201 struct v4l2_routing {
202 	u32 input;
203 	u32 output;
204 };
205 
206 /* ------------------------------------------------------------------------- */
207 
208 /* Miscellaneous helper functions */
209 
210 void 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 int v4l_fill_dv_preset_info(u32 preset, struct v4l2_dv_enum_preset *info);
216 #endif /* V4L2_COMMON_H_ */
217