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/bitops.h>
16 #include <linux/device.h>
17 #include <linux/mutex.h>
19 #include <linux/videodev2.h>
20 #include <media/videobuf-core.h>
21 #include <media/videobuf2-core.h>
22 #include <media/v4l2-ctrls.h>
23 #include <media/v4l2-device.h>
26 struct soc_camera_link;
28 struct soc_camera_device {
29 struct list_head list; /* list of all registered devices */
30 struct soc_camera_link *link;
31 struct device *pdev; /* Platform device */
32 struct device *parent; /* Camera host device */
33 struct device *control; /* E.g., the i2c client */
36 u32 bytesperline; /* for padding, zero if unused */
38 enum v4l2_colorspace colorspace;
39 unsigned char iface; /* Host number */
40 unsigned char devnum; /* Device number per host */
41 struct soc_camera_sense *sense; /* See comment in struct definition */
42 struct video_device *vdev;
43 struct v4l2_ctrl_handler ctrl_handler;
44 const struct soc_camera_format_xlate *current_fmt;
45 struct soc_camera_format_xlate *user_formats;
47 enum v4l2_field field; /* Preserve field over close() */
48 void *host_priv; /* Per-device host private data */
49 /* soc_camera.c private count. Only accessed with .video_lock held */
51 struct mutex video_lock; /* Protects device data */
52 struct file *streamer; /* stream owner */
54 struct videobuf_queue vb_vidq;
55 struct vb2_queue vb2_vidq;
59 /* Host supports programmable stride */
60 #define SOCAM_HOST_CAP_STRIDE (1 << 0)
62 struct soc_camera_host {
63 struct v4l2_device v4l2_dev;
64 struct list_head list;
65 struct mutex host_lock; /* Protect during probing */
66 unsigned char nr; /* Host number */
70 struct soc_camera_host_ops *ops;
73 struct soc_camera_host_ops {
75 int (*add)(struct soc_camera_device *);
76 void (*remove)(struct soc_camera_device *);
78 * .get_formats() is called for each client device format, but
79 * .put_formats() is only called once. Further, if any of the calls to
80 * .get_formats() fail, .put_formats() will not be called at all, the
81 * failing .get_formats() must then clean up internally.
83 int (*get_formats)(struct soc_camera_device *, unsigned int,
84 struct soc_camera_format_xlate *);
85 void (*put_formats)(struct soc_camera_device *);
86 int (*cropcap)(struct soc_camera_device *, struct v4l2_cropcap *);
87 int (*get_crop)(struct soc_camera_device *, struct v4l2_crop *);
88 int (*set_crop)(struct soc_camera_device *, struct v4l2_crop *);
90 * The difference to .set_crop() is, that .set_livecrop is not allowed
91 * to change the output sizes
93 int (*set_livecrop)(struct soc_camera_device *, struct v4l2_crop *);
94 int (*set_fmt)(struct soc_camera_device *, struct v4l2_format *);
95 int (*try_fmt)(struct soc_camera_device *, struct v4l2_format *);
96 void (*init_videobuf)(struct videobuf_queue *,
97 struct soc_camera_device *);
98 int (*init_videobuf2)(struct vb2_queue *,
99 struct soc_camera_device *);
100 int (*reqbufs)(struct soc_camera_device *, struct v4l2_requestbuffers *);
101 int (*querycap)(struct soc_camera_host *, struct v4l2_capability *);
102 int (*set_bus_param)(struct soc_camera_device *);
103 int (*get_parm)(struct soc_camera_device *, struct v4l2_streamparm *);
104 int (*set_parm)(struct soc_camera_device *, struct v4l2_streamparm *);
105 int (*enum_framesizes)(struct soc_camera_device *, struct v4l2_frmsizeenum *);
106 unsigned int (*poll)(struct file *, poll_table *);
109 #define SOCAM_SENSOR_INVERT_PCLK (1 << 0)
110 #define SOCAM_SENSOR_INVERT_MCLK (1 << 1)
111 #define SOCAM_SENSOR_INVERT_HSYNC (1 << 2)
112 #define SOCAM_SENSOR_INVERT_VSYNC (1 << 3)
113 #define SOCAM_SENSOR_INVERT_DATA (1 << 4)
115 struct i2c_board_info;
116 struct regulator_bulk_data;
118 struct soc_camera_link {
119 /* Camera bus id, used to match a camera and a bus */
121 /* Per camera SOCAM_SENSOR_* bus flags */
124 struct i2c_board_info *board_info;
125 const char *module_name;
128 /* Optional regulators that have to be managed on power on/off events */
129 struct regulator_bulk_data *regulators;
133 * For non-I2C devices platform has to provide methods to add a device
134 * to the system and to remove it
136 int (*add_device)(struct soc_camera_device *);
137 void (*del_device)(struct soc_camera_device *);
138 /* Optional callbacks to power on or off and reset the sensor */
139 int (*power)(struct device *, int);
140 int (*reset)(struct device *);
142 * some platforms may support different data widths than the sensors
143 * native ones due to different data line routing. Let the board code
144 * overwrite the width flags.
146 int (*set_bus_param)(struct soc_camera_link *, unsigned long flags);
147 unsigned long (*query_bus_param)(struct soc_camera_link *);
148 void (*free_bus)(struct soc_camera_link *);
151 static inline struct soc_camera_host *to_soc_camera_host(
152 const struct device *dev)
154 struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
156 return container_of(v4l2_dev, struct soc_camera_host, v4l2_dev);
159 static inline struct soc_camera_link *to_soc_camera_link(
160 const struct soc_camera_device *icd)
165 static inline struct device *to_soc_camera_control(
166 const struct soc_camera_device *icd)
171 static inline struct v4l2_subdev *soc_camera_to_subdev(
172 const struct soc_camera_device *icd)
174 struct device *control = to_soc_camera_control(icd);
175 return dev_get_drvdata(control);
178 int soc_camera_host_register(struct soc_camera_host *ici);
179 void soc_camera_host_unregister(struct soc_camera_host *ici);
181 const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
182 struct soc_camera_device *icd, unsigned int fourcc);
185 * struct soc_camera_format_xlate - match between host and sensor formats
186 * @code: code of a sensor provided format
187 * @host_fmt: host format after host translation from code
189 * Host and sensor translation structure. Used in table of host and sensor
190 * formats matchings in soc_camera_device. A host can override the generic list
191 * generation by implementing get_formats(), and use it for format checks and
194 struct soc_camera_format_xlate {
195 enum v4l2_mbus_pixelcode code;
196 const struct soc_mbus_pixelfmt *host_fmt;
199 #define SOCAM_SENSE_PCLK_CHANGED (1 << 0)
202 * This struct can be attached to struct soc_camera_device by the host driver
203 * to request sense from the camera, for example, when calling .set_fmt(). The
204 * host then can check which flags are set and verify respective values if any.
205 * For example, if SOCAM_SENSE_PCLK_CHANGED is set, it means, pixclock has
206 * changed during this operation. After completion the host should detach sense.
208 * @flags ored SOCAM_SENSE_* flags
209 * @master_clock if the host wants to be informed about pixel-clock
210 * change, it better set master_clock.
211 * @pixel_clock_max maximum pixel clock frequency supported by the host,
212 * camera is not allowed to exceed this.
213 * @pixel_clock if the camera driver changed pixel clock during this
214 * operation, it sets SOCAM_SENSE_PCLK_CHANGED, uses
215 * master_clock to calculate the new pixel-clock and
218 struct soc_camera_sense {
220 unsigned long master_clock;
221 unsigned long pixel_clock_max;
222 unsigned long pixel_clock;
225 #define SOCAM_DATAWIDTH(x) BIT((x) - 1)
226 #define SOCAM_DATAWIDTH_4 SOCAM_DATAWIDTH(4)
227 #define SOCAM_DATAWIDTH_8 SOCAM_DATAWIDTH(8)
228 #define SOCAM_DATAWIDTH_9 SOCAM_DATAWIDTH(9)
229 #define SOCAM_DATAWIDTH_10 SOCAM_DATAWIDTH(10)
230 #define SOCAM_DATAWIDTH_15 SOCAM_DATAWIDTH(15)
231 #define SOCAM_DATAWIDTH_16 SOCAM_DATAWIDTH(16)
233 #define SOCAM_DATAWIDTH_MASK (SOCAM_DATAWIDTH_4 | SOCAM_DATAWIDTH_8 | \
234 SOCAM_DATAWIDTH_9 | SOCAM_DATAWIDTH_10 | \
235 SOCAM_DATAWIDTH_15 | SOCAM_DATAWIDTH_16)
237 static inline void soc_camera_limit_side(int *start, int *length,
238 unsigned int start_min,
239 unsigned int length_min, unsigned int length_max)
241 if (*length < length_min)
242 *length = length_min;
243 else if (*length > length_max)
244 *length = length_max;
246 if (*start < start_min)
248 else if (*start > start_min + length_max - *length)
249 *start = start_min + length_max - *length;
252 unsigned long soc_camera_apply_sensor_flags(struct soc_camera_link *icl,
253 unsigned long flags);
254 unsigned long soc_camera_apply_board_flags(struct soc_camera_link *icl,
255 const struct v4l2_mbus_config *cfg);
257 /* This is only temporary here - until v4l2-subdev begins to link to video_device */
258 #include <linux/i2c.h>
259 static inline struct video_device *soc_camera_i2c_to_vdev(const struct i2c_client *client)
261 struct v4l2_subdev *sd = i2c_get_clientdata(client);
262 struct soc_camera_device *icd = v4l2_get_subdev_hostdata(sd);
263 return icd ? icd->vdev : NULL;
266 static inline struct soc_camera_link *soc_camera_i2c_to_link(const struct i2c_client *client)
268 return client->dev.platform_data;
271 static inline struct v4l2_subdev *soc_camera_vdev_to_subdev(const struct video_device *vdev)
273 struct soc_camera_device *icd = dev_get_drvdata(vdev->parent);
274 return soc_camera_to_subdev(icd);
277 static inline struct soc_camera_device *soc_camera_from_vb2q(const struct vb2_queue *vq)
279 return container_of(vq, struct soc_camera_device, vb2_vidq);
282 static inline struct soc_camera_device *soc_camera_from_vbq(const struct videobuf_queue *vq)
284 return container_of(vq, struct soc_camera_device, vb_vidq);
287 static inline u32 soc_camera_grp_id(const struct soc_camera_device *icd)
289 return (icd->iface << 8) | (icd->devnum + 1);
292 void soc_camera_lock(struct vb2_queue *vq);
293 void soc_camera_unlock(struct vb2_queue *vq);