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 */
27 unsigned short y_skip_top; /* Lines to skip at the top */
28 unsigned char iface; /* Host number */
29 unsigned char devnum; /* Device number per host */
30 unsigned char buswidth; /* See comment in .c */
31 struct soc_camera_sense *sense; /* See comment in struct definition */
32 struct soc_camera_ops *ops;
33 struct video_device *vdev;
34 const struct soc_camera_data_format *current_fmt;
35 const struct soc_camera_data_format *formats;
37 struct soc_camera_format_xlate *user_formats;
39 enum v4l2_field field; /* Preserve field over close() */
40 void *host_priv; /* Per-device host private data */
41 /* soc_camera.c private count. Only accessed with .video_lock held */
43 struct mutex video_lock; /* Protects device data */
46 struct soc_camera_file {
47 struct soc_camera_device *icd;
48 struct videobuf_queue vb_vidq;
51 struct soc_camera_host {
52 struct v4l2_device v4l2_dev;
53 struct list_head list;
54 unsigned char nr; /* Host number */
57 struct soc_camera_host_ops *ops;
60 struct soc_camera_host_ops {
62 int (*add)(struct soc_camera_device *);
63 void (*remove)(struct soc_camera_device *);
64 int (*suspend)(struct soc_camera_device *, pm_message_t);
65 int (*resume)(struct soc_camera_device *);
67 * .get_formats() is called for each client device format, but
68 * .put_formats() is only called once. Further, if any of the calls to
69 * .get_formats() fail, .put_formats() will not be called at all, the
70 * failing .get_formats() must then clean up internally.
72 int (*get_formats)(struct soc_camera_device *, int,
73 struct soc_camera_format_xlate *);
74 void (*put_formats)(struct soc_camera_device *);
75 int (*cropcap)(struct soc_camera_device *, struct v4l2_cropcap *);
76 int (*get_crop)(struct soc_camera_device *, struct v4l2_crop *);
77 int (*set_crop)(struct soc_camera_device *, struct v4l2_crop *);
78 int (*set_fmt)(struct soc_camera_device *, struct v4l2_format *);
79 int (*try_fmt)(struct soc_camera_device *, struct v4l2_format *);
80 void (*init_videobuf)(struct videobuf_queue *,
81 struct soc_camera_device *);
82 int (*reqbufs)(struct soc_camera_file *, struct v4l2_requestbuffers *);
83 int (*querycap)(struct soc_camera_host *, struct v4l2_capability *);
84 int (*set_bus_param)(struct soc_camera_device *, __u32);
85 int (*get_ctrl)(struct soc_camera_device *, struct v4l2_control *);
86 int (*set_ctrl)(struct soc_camera_device *, struct v4l2_control *);
87 unsigned int (*poll)(struct file *, poll_table *);
88 const struct v4l2_queryctrl *controls;
92 #define SOCAM_SENSOR_INVERT_PCLK (1 << 0)
93 #define SOCAM_SENSOR_INVERT_MCLK (1 << 1)
94 #define SOCAM_SENSOR_INVERT_HSYNC (1 << 2)
95 #define SOCAM_SENSOR_INVERT_VSYNC (1 << 3)
96 #define SOCAM_SENSOR_INVERT_DATA (1 << 4)
98 struct i2c_board_info;
100 struct soc_camera_link {
101 /* Camera bus id, used to match a camera and a bus */
103 /* Per camera SOCAM_SENSOR_* bus flags */
106 struct i2c_board_info *board_info;
107 const char *module_name;
109 * For non-I2C devices platform platform has to provide methods to
110 * add a device to the system and to remove
112 int (*add_device)(struct soc_camera_link *, struct device *);
113 void (*del_device)(struct soc_camera_link *);
114 /* Optional callbacks to power on or off and reset the sensor */
115 int (*power)(struct device *, int);
116 int (*reset)(struct device *);
118 * some platforms may support different data widths than the sensors
119 * native ones due to different data line routing. Let the board code
120 * overwrite the width flags.
122 int (*set_bus_param)(struct soc_camera_link *, unsigned long flags);
123 unsigned long (*query_bus_param)(struct soc_camera_link *);
124 void (*free_bus)(struct soc_camera_link *);
127 static inline struct soc_camera_device *to_soc_camera_dev(
128 const struct device *dev)
130 return container_of(dev, struct soc_camera_device, dev);
133 static inline struct soc_camera_host *to_soc_camera_host(
134 const struct device *dev)
136 struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
138 return container_of(v4l2_dev, struct soc_camera_host, v4l2_dev);
141 static inline struct soc_camera_link *to_soc_camera_link(
142 const struct soc_camera_device *icd)
144 return icd->dev.platform_data;
147 static inline struct device *to_soc_camera_control(
148 const struct soc_camera_device *icd)
150 return dev_get_drvdata(&icd->dev);
153 static inline struct v4l2_subdev *soc_camera_to_subdev(
154 const struct soc_camera_device *icd)
156 struct device *control = to_soc_camera_control(icd);
157 return dev_get_drvdata(control);
160 int soc_camera_host_register(struct soc_camera_host *ici);
161 void soc_camera_host_unregister(struct soc_camera_host *ici);
163 const struct soc_camera_data_format *soc_camera_format_by_fourcc(
164 struct soc_camera_device *icd, unsigned int fourcc);
165 const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
166 struct soc_camera_device *icd, unsigned int fourcc);
168 struct soc_camera_data_format {
172 enum v4l2_colorspace colorspace;
176 * struct soc_camera_format_xlate - match between host and sensor formats
177 * @cam_fmt: sensor format provided by the sensor
178 * @host_fmt: host format after host translation from cam_fmt
179 * @buswidth: bus width for this format
181 * Host and sensor translation structure. Used in table of host and sensor
182 * formats matchings in soc_camera_device. A host can override the generic list
183 * generation by implementing get_formats(), and use it for format checks and
186 struct soc_camera_format_xlate {
187 const struct soc_camera_data_format *cam_fmt;
188 const struct soc_camera_data_format *host_fmt;
189 unsigned char buswidth;
192 struct soc_camera_ops {
193 int (*suspend)(struct soc_camera_device *, pm_message_t state);
194 int (*resume)(struct soc_camera_device *);
195 unsigned long (*query_bus_param)(struct soc_camera_device *);
196 int (*set_bus_param)(struct soc_camera_device *, unsigned long);
197 int (*enum_input)(struct soc_camera_device *, struct v4l2_input *);
198 const struct v4l2_queryctrl *controls;
202 #define SOCAM_SENSE_PCLK_CHANGED (1 << 0)
205 * This struct can be attached to struct soc_camera_device by the host driver
206 * to request sense from the camera, for example, when calling .set_fmt(). The
207 * host then can check which flags are set and verify respective values if any.
208 * For example, if SOCAM_SENSE_PCLK_CHANGED is set, it means, pixclock has
209 * changed during this operation. After completion the host should detach sense.
211 * @flags ored SOCAM_SENSE_* flags
212 * @master_clock if the host wants to be informed about pixel-clock
213 * change, it better set master_clock.
214 * @pixel_clock_max maximum pixel clock frequency supported by the host,
215 * camera is not allowed to exceed this.
216 * @pixel_clock if the camera driver changed pixel clock during this
217 * operation, it sets SOCAM_SENSE_PCLK_CHANGED, uses
218 * master_clock to calculate the new pixel-clock and
221 struct soc_camera_sense {
223 unsigned long master_clock;
224 unsigned long pixel_clock_max;
225 unsigned long pixel_clock;
228 static inline struct v4l2_queryctrl const *soc_camera_find_qctrl(
229 struct soc_camera_ops *ops, int id)
233 for (i = 0; i < ops->num_controls; i++)
234 if (ops->controls[i].id == id)
235 return &ops->controls[i];
240 #define SOCAM_MASTER (1 << 0)
241 #define SOCAM_SLAVE (1 << 1)
242 #define SOCAM_HSYNC_ACTIVE_HIGH (1 << 2)
243 #define SOCAM_HSYNC_ACTIVE_LOW (1 << 3)
244 #define SOCAM_VSYNC_ACTIVE_HIGH (1 << 4)
245 #define SOCAM_VSYNC_ACTIVE_LOW (1 << 5)
246 #define SOCAM_DATAWIDTH_4 (1 << 6)
247 #define SOCAM_DATAWIDTH_8 (1 << 7)
248 #define SOCAM_DATAWIDTH_9 (1 << 8)
249 #define SOCAM_DATAWIDTH_10 (1 << 9)
250 #define SOCAM_DATAWIDTH_15 (1 << 10)
251 #define SOCAM_DATAWIDTH_16 (1 << 11)
252 #define SOCAM_PCLK_SAMPLE_RISING (1 << 12)
253 #define SOCAM_PCLK_SAMPLE_FALLING (1 << 13)
254 #define SOCAM_DATA_ACTIVE_HIGH (1 << 14)
255 #define SOCAM_DATA_ACTIVE_LOW (1 << 15)
257 #define SOCAM_DATAWIDTH_MASK (SOCAM_DATAWIDTH_4 | SOCAM_DATAWIDTH_8 | \
258 SOCAM_DATAWIDTH_9 | SOCAM_DATAWIDTH_10 | \
259 SOCAM_DATAWIDTH_15 | SOCAM_DATAWIDTH_16)
261 static inline unsigned long soc_camera_bus_param_compatible(
262 unsigned long camera_flags, unsigned long bus_flags)
264 unsigned long common_flags, hsync, vsync, pclk, data, buswidth, mode;
266 common_flags = camera_flags & bus_flags;
268 hsync = common_flags & (SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW);
269 vsync = common_flags & (SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW);
270 pclk = common_flags & (SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING);
271 data = common_flags & (SOCAM_DATA_ACTIVE_HIGH | SOCAM_DATA_ACTIVE_LOW);
272 mode = common_flags & (SOCAM_MASTER | SOCAM_SLAVE);
273 buswidth = common_flags & SOCAM_DATAWIDTH_MASK;
275 return (!hsync || !vsync || !pclk || !data || !mode || !buswidth) ? 0 :
279 static inline void soc_camera_limit_side(unsigned int *start,
280 unsigned int *length, unsigned int start_min,
281 unsigned int length_min, unsigned int length_max)
283 if (*length < length_min)
284 *length = length_min;
285 else if (*length > length_max)
286 *length = length_max;
288 if (*start < start_min)
290 else if (*start > start_min + length_max - *length)
291 *start = start_min + length_max - *length;
294 extern unsigned long soc_camera_apply_sensor_flags(struct soc_camera_link *icl,
295 unsigned long flags);