2 * camera image capture (abstract) bus driver header
4 * Copyright (C) 2006, Sascha Hauer, Pengutronix
5 * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
15 #include <linux/mutex.h>
17 #include <linux/videodev2.h>
18 #include <media/videobuf-core.h>
19 #include <media/v4l2-device.h>
21 struct soc_camera_device {
22 struct list_head list;
24 struct device *pdev; /* Platform device */
25 struct v4l2_rect rect_current; /* Current window */
26 struct v4l2_rect rect_max; /* Maximum window */
27 unsigned short width_min;
28 unsigned short height_min;
29 unsigned short y_skip_top; /* Lines to skip at the top */
31 unsigned short exposure;
32 unsigned char iface; /* Host number */
33 unsigned char devnum; /* Device number per host */
34 unsigned char buswidth; /* See comment in .c */
35 struct soc_camera_sense *sense; /* See comment in struct definition */
36 struct soc_camera_ops *ops;
37 struct video_device *vdev;
38 const struct soc_camera_data_format *current_fmt;
39 const struct soc_camera_data_format *formats;
41 struct soc_camera_format_xlate *user_formats;
43 enum v4l2_field field; /* Preserve field over close() */
44 void *host_priv; /* Per-device host private data */
45 /* soc_camera.c private count. Only accessed with .video_lock held */
47 struct mutex video_lock; /* Protects device data */
50 struct soc_camera_file {
51 struct soc_camera_device *icd;
52 struct videobuf_queue vb_vidq;
55 struct soc_camera_host {
56 struct v4l2_device v4l2_dev;
57 struct list_head list;
58 unsigned char nr; /* Host number */
61 struct soc_camera_host_ops *ops;
64 struct soc_camera_host_ops {
66 int (*add)(struct soc_camera_device *);
67 void (*remove)(struct soc_camera_device *);
68 int (*suspend)(struct soc_camera_device *, pm_message_t);
69 int (*resume)(struct soc_camera_device *);
70 int (*get_formats)(struct soc_camera_device *, int,
71 struct soc_camera_format_xlate *);
72 int (*set_crop)(struct soc_camera_device *, struct v4l2_rect *);
73 int (*set_fmt)(struct soc_camera_device *, struct v4l2_format *);
74 int (*try_fmt)(struct soc_camera_device *, struct v4l2_format *);
75 void (*init_videobuf)(struct videobuf_queue *,
76 struct soc_camera_device *);
77 int (*reqbufs)(struct soc_camera_file *, struct v4l2_requestbuffers *);
78 int (*querycap)(struct soc_camera_host *, struct v4l2_capability *);
79 int (*set_bus_param)(struct soc_camera_device *, __u32);
80 int (*get_ctrl)(struct soc_camera_device *, struct v4l2_control *);
81 int (*set_ctrl)(struct soc_camera_device *, struct v4l2_control *);
82 unsigned int (*poll)(struct file *, poll_table *);
83 const struct v4l2_queryctrl *controls;
87 #define SOCAM_SENSOR_INVERT_PCLK (1 << 0)
88 #define SOCAM_SENSOR_INVERT_MCLK (1 << 1)
89 #define SOCAM_SENSOR_INVERT_HSYNC (1 << 2)
90 #define SOCAM_SENSOR_INVERT_VSYNC (1 << 3)
91 #define SOCAM_SENSOR_INVERT_DATA (1 << 4)
93 struct i2c_board_info;
95 struct soc_camera_link {
96 /* Camera bus id, used to match a camera and a bus */
98 /* Per camera SOCAM_SENSOR_* bus flags */
101 struct i2c_board_info *board_info;
102 const char *module_name;
104 * For non-I2C devices platform platform has to provide methods to
105 * add a device to the system and to remove
107 int (*add_device)(struct soc_camera_link *, struct device *);
108 void (*del_device)(struct soc_camera_link *);
109 /* Optional callbacks to power on or off and reset the sensor */
110 int (*power)(struct device *, int);
111 int (*reset)(struct device *);
113 * some platforms may support different data widths than the sensors
114 * native ones due to different data line routing. Let the board code
115 * overwrite the width flags.
117 int (*set_bus_param)(struct soc_camera_link *, unsigned long flags);
118 unsigned long (*query_bus_param)(struct soc_camera_link *);
119 void (*free_bus)(struct soc_camera_link *);
122 static inline struct soc_camera_device *to_soc_camera_dev(struct device *dev)
124 return container_of(dev, struct soc_camera_device, dev);
127 static inline struct soc_camera_host *to_soc_camera_host(struct device *dev)
129 struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
131 return container_of(v4l2_dev, struct soc_camera_host, v4l2_dev);
134 static inline struct soc_camera_link *to_soc_camera_link(struct soc_camera_device *icd)
136 return icd->dev.platform_data;
139 static inline struct device *to_soc_camera_control(struct soc_camera_device *icd)
141 return dev_get_drvdata(&icd->dev);
144 int soc_camera_host_register(struct soc_camera_host *ici);
145 void soc_camera_host_unregister(struct soc_camera_host *ici);
147 const struct soc_camera_data_format *soc_camera_format_by_fourcc(
148 struct soc_camera_device *icd, unsigned int fourcc);
149 const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
150 struct soc_camera_device *icd, unsigned int fourcc);
152 struct soc_camera_data_format {
156 enum v4l2_colorspace colorspace;
160 * struct soc_camera_format_xlate - match between host and sensor formats
161 * @cam_fmt: sensor format provided by the sensor
162 * @host_fmt: host format after host translation from cam_fmt
163 * @buswidth: bus width for this format
165 * Host and sensor translation structure. Used in table of host and sensor
166 * formats matchings in soc_camera_device. A host can override the generic list
167 * generation by implementing get_formats(), and use it for format checks and
170 struct soc_camera_format_xlate {
171 const struct soc_camera_data_format *cam_fmt;
172 const struct soc_camera_data_format *host_fmt;
173 unsigned char buswidth;
176 struct soc_camera_ops {
177 int (*suspend)(struct soc_camera_device *, pm_message_t state);
178 int (*resume)(struct soc_camera_device *);
179 int (*init)(struct soc_camera_device *);
180 int (*release)(struct soc_camera_device *);
181 int (*set_crop)(struct soc_camera_device *, struct v4l2_rect *);
182 unsigned long (*query_bus_param)(struct soc_camera_device *);
183 int (*set_bus_param)(struct soc_camera_device *, unsigned long);
184 int (*get_chip_id)(struct soc_camera_device *,
185 struct v4l2_dbg_chip_ident *);
186 int (*set_std)(struct soc_camera_device *, v4l2_std_id *);
187 int (*enum_input)(struct soc_camera_device *, struct v4l2_input *);
188 const struct v4l2_queryctrl *controls;
192 #define SOCAM_SENSE_PCLK_CHANGED (1 << 0)
195 * This struct can be attached to struct soc_camera_device by the host driver
196 * to request sense from the camera, for example, when calling .set_fmt(). The
197 * host then can check which flags are set and verify respective values if any.
198 * For example, if SOCAM_SENSE_PCLK_CHANGED is set, it means, pixclock has
199 * changed during this operation. After completion the host should detach sense.
201 * @flags ored SOCAM_SENSE_* flags
202 * @master_clock if the host wants to be informed about pixel-clock
203 * change, it better set master_clock.
204 * @pixel_clock_max maximum pixel clock frequency supported by the host,
205 * camera is not allowed to exceed this.
206 * @pixel_clock if the camera driver changed pixel clock during this
207 * operation, it sets SOCAM_SENSE_PCLK_CHANGED, uses
208 * master_clock to calculate the new pixel-clock and
211 struct soc_camera_sense {
213 unsigned long master_clock;
214 unsigned long pixel_clock_max;
215 unsigned long pixel_clock;
218 static inline struct v4l2_queryctrl const *soc_camera_find_qctrl(
219 struct soc_camera_ops *ops, int id)
223 for (i = 0; i < ops->num_controls; i++)
224 if (ops->controls[i].id == id)
225 return &ops->controls[i];
230 #define SOCAM_MASTER (1 << 0)
231 #define SOCAM_SLAVE (1 << 1)
232 #define SOCAM_HSYNC_ACTIVE_HIGH (1 << 2)
233 #define SOCAM_HSYNC_ACTIVE_LOW (1 << 3)
234 #define SOCAM_VSYNC_ACTIVE_HIGH (1 << 4)
235 #define SOCAM_VSYNC_ACTIVE_LOW (1 << 5)
236 #define SOCAM_DATAWIDTH_4 (1 << 6)
237 #define SOCAM_DATAWIDTH_8 (1 << 7)
238 #define SOCAM_DATAWIDTH_9 (1 << 8)
239 #define SOCAM_DATAWIDTH_10 (1 << 9)
240 #define SOCAM_DATAWIDTH_15 (1 << 10)
241 #define SOCAM_DATAWIDTH_16 (1 << 11)
242 #define SOCAM_PCLK_SAMPLE_RISING (1 << 12)
243 #define SOCAM_PCLK_SAMPLE_FALLING (1 << 13)
244 #define SOCAM_DATA_ACTIVE_HIGH (1 << 14)
245 #define SOCAM_DATA_ACTIVE_LOW (1 << 15)
247 #define SOCAM_DATAWIDTH_MASK (SOCAM_DATAWIDTH_4 | SOCAM_DATAWIDTH_8 | \
248 SOCAM_DATAWIDTH_9 | SOCAM_DATAWIDTH_10 | \
249 SOCAM_DATAWIDTH_15 | SOCAM_DATAWIDTH_16)
251 static inline unsigned long soc_camera_bus_param_compatible(
252 unsigned long camera_flags, unsigned long bus_flags)
254 unsigned long common_flags, hsync, vsync, pclk, data, buswidth, mode;
256 common_flags = camera_flags & bus_flags;
258 hsync = common_flags & (SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW);
259 vsync = common_flags & (SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW);
260 pclk = common_flags & (SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING);
261 data = common_flags & (SOCAM_DATA_ACTIVE_HIGH | SOCAM_DATA_ACTIVE_LOW);
262 mode = common_flags & (SOCAM_MASTER | SOCAM_SLAVE);
263 buswidth = common_flags & SOCAM_DATAWIDTH_MASK;
265 return (!hsync || !vsync || !pclk || !data || !mode || !buswidth) ? 0 :
269 extern unsigned long soc_camera_apply_sensor_flags(struct soc_camera_link *icl,
270 unsigned long flags);