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 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 *);
71 * .get_formats() is called for each client device format, but
72 * .put_formats() is only called once. Further, if any of the calls to
73 * .get_formats() fail, .put_formats() will not be called at all, the
74 * failing .get_formats() must then clean up internally.
76 int (*get_formats)(struct soc_camera_device *, int,
77 struct soc_camera_format_xlate *);
78 void (*put_formats)(struct soc_camera_device *);
79 int (*cropcap)(struct soc_camera_device *, struct v4l2_cropcap *);
80 int (*get_crop)(struct soc_camera_device *, struct v4l2_crop *);
81 int (*set_crop)(struct soc_camera_device *, struct v4l2_crop *);
82 int (*set_fmt)(struct soc_camera_device *, struct v4l2_format *);
83 int (*try_fmt)(struct soc_camera_device *, struct v4l2_format *);
84 void (*init_videobuf)(struct videobuf_queue *,
85 struct soc_camera_device *);
86 int (*reqbufs)(struct soc_camera_file *, struct v4l2_requestbuffers *);
87 int (*querycap)(struct soc_camera_host *, struct v4l2_capability *);
88 int (*set_bus_param)(struct soc_camera_device *, __u32);
89 int (*get_ctrl)(struct soc_camera_device *, struct v4l2_control *);
90 int (*set_ctrl)(struct soc_camera_device *, struct v4l2_control *);
91 unsigned int (*poll)(struct file *, poll_table *);
92 const struct v4l2_queryctrl *controls;
96 #define SOCAM_SENSOR_INVERT_PCLK (1 << 0)
97 #define SOCAM_SENSOR_INVERT_MCLK (1 << 1)
98 #define SOCAM_SENSOR_INVERT_HSYNC (1 << 2)
99 #define SOCAM_SENSOR_INVERT_VSYNC (1 << 3)
100 #define SOCAM_SENSOR_INVERT_DATA (1 << 4)
102 struct i2c_board_info;
104 struct soc_camera_link {
105 /* Camera bus id, used to match a camera and a bus */
107 /* Per camera SOCAM_SENSOR_* bus flags */
110 struct i2c_board_info *board_info;
111 const char *module_name;
113 * For non-I2C devices platform platform has to provide methods to
114 * add a device to the system and to remove
116 int (*add_device)(struct soc_camera_link *, struct device *);
117 void (*del_device)(struct soc_camera_link *);
118 /* Optional callbacks to power on or off and reset the sensor */
119 int (*power)(struct device *, int);
120 int (*reset)(struct device *);
122 * some platforms may support different data widths than the sensors
123 * native ones due to different data line routing. Let the board code
124 * overwrite the width flags.
126 int (*set_bus_param)(struct soc_camera_link *, unsigned long flags);
127 unsigned long (*query_bus_param)(struct soc_camera_link *);
128 void (*free_bus)(struct soc_camera_link *);
131 static inline struct soc_camera_device *to_soc_camera_dev(const struct device *dev)
133 return container_of(dev, struct soc_camera_device, dev);
136 static inline struct soc_camera_host *to_soc_camera_host(const struct device *dev)
138 struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
140 return container_of(v4l2_dev, struct soc_camera_host, v4l2_dev);
143 static inline struct soc_camera_link *to_soc_camera_link(const struct soc_camera_device *icd)
145 return icd->dev.platform_data;
148 static inline struct device *to_soc_camera_control(const struct soc_camera_device *icd)
150 return dev_get_drvdata(&icd->dev);
153 static inline struct v4l2_subdev *soc_camera_to_subdev(const struct soc_camera_device *icd)
155 struct device *control = to_soc_camera_control(icd);
156 return dev_get_drvdata(control);
159 int soc_camera_host_register(struct soc_camera_host *ici);
160 void soc_camera_host_unregister(struct soc_camera_host *ici);
162 const struct soc_camera_data_format *soc_camera_format_by_fourcc(
163 struct soc_camera_device *icd, unsigned int fourcc);
164 const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
165 struct soc_camera_device *icd, unsigned int fourcc);
167 struct soc_camera_data_format {
171 enum v4l2_colorspace colorspace;
175 * struct soc_camera_format_xlate - match between host and sensor formats
176 * @cam_fmt: sensor format provided by the sensor
177 * @host_fmt: host format after host translation from cam_fmt
178 * @buswidth: bus width for this format
180 * Host and sensor translation structure. Used in table of host and sensor
181 * formats matchings in soc_camera_device. A host can override the generic list
182 * generation by implementing get_formats(), and use it for format checks and
185 struct soc_camera_format_xlate {
186 const struct soc_camera_data_format *cam_fmt;
187 const struct soc_camera_data_format *host_fmt;
188 unsigned char buswidth;
191 struct soc_camera_ops {
192 int (*suspend)(struct soc_camera_device *, pm_message_t state);
193 int (*resume)(struct soc_camera_device *);
194 int (*init)(struct soc_camera_device *);
195 int (*release)(struct soc_camera_device *);
196 unsigned long (*query_bus_param)(struct soc_camera_device *);
197 int (*set_bus_param)(struct soc_camera_device *, unsigned long);
198 int (*get_chip_id)(struct soc_camera_device *,
199 struct v4l2_dbg_chip_ident *);
200 int (*enum_input)(struct soc_camera_device *, struct v4l2_input *);
201 const struct v4l2_queryctrl *controls;
205 #define SOCAM_SENSE_PCLK_CHANGED (1 << 0)
208 * This struct can be attached to struct soc_camera_device by the host driver
209 * to request sense from the camera, for example, when calling .set_fmt(). The
210 * host then can check which flags are set and verify respective values if any.
211 * For example, if SOCAM_SENSE_PCLK_CHANGED is set, it means, pixclock has
212 * changed during this operation. After completion the host should detach sense.
214 * @flags ored SOCAM_SENSE_* flags
215 * @master_clock if the host wants to be informed about pixel-clock
216 * change, it better set master_clock.
217 * @pixel_clock_max maximum pixel clock frequency supported by the host,
218 * camera is not allowed to exceed this.
219 * @pixel_clock if the camera driver changed pixel clock during this
220 * operation, it sets SOCAM_SENSE_PCLK_CHANGED, uses
221 * master_clock to calculate the new pixel-clock and
224 struct soc_camera_sense {
226 unsigned long master_clock;
227 unsigned long pixel_clock_max;
228 unsigned long pixel_clock;
231 static inline struct v4l2_queryctrl const *soc_camera_find_qctrl(
232 struct soc_camera_ops *ops, int id)
236 for (i = 0; i < ops->num_controls; i++)
237 if (ops->controls[i].id == id)
238 return &ops->controls[i];
243 #define SOCAM_MASTER (1 << 0)
244 #define SOCAM_SLAVE (1 << 1)
245 #define SOCAM_HSYNC_ACTIVE_HIGH (1 << 2)
246 #define SOCAM_HSYNC_ACTIVE_LOW (1 << 3)
247 #define SOCAM_VSYNC_ACTIVE_HIGH (1 << 4)
248 #define SOCAM_VSYNC_ACTIVE_LOW (1 << 5)
249 #define SOCAM_DATAWIDTH_4 (1 << 6)
250 #define SOCAM_DATAWIDTH_8 (1 << 7)
251 #define SOCAM_DATAWIDTH_9 (1 << 8)
252 #define SOCAM_DATAWIDTH_10 (1 << 9)
253 #define SOCAM_DATAWIDTH_15 (1 << 10)
254 #define SOCAM_DATAWIDTH_16 (1 << 11)
255 #define SOCAM_PCLK_SAMPLE_RISING (1 << 12)
256 #define SOCAM_PCLK_SAMPLE_FALLING (1 << 13)
257 #define SOCAM_DATA_ACTIVE_HIGH (1 << 14)
258 #define SOCAM_DATA_ACTIVE_LOW (1 << 15)
260 #define SOCAM_DATAWIDTH_MASK (SOCAM_DATAWIDTH_4 | SOCAM_DATAWIDTH_8 | \
261 SOCAM_DATAWIDTH_9 | SOCAM_DATAWIDTH_10 | \
262 SOCAM_DATAWIDTH_15 | SOCAM_DATAWIDTH_16)
264 static inline unsigned long soc_camera_bus_param_compatible(
265 unsigned long camera_flags, unsigned long bus_flags)
267 unsigned long common_flags, hsync, vsync, pclk, data, buswidth, mode;
269 common_flags = camera_flags & bus_flags;
271 hsync = common_flags & (SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW);
272 vsync = common_flags & (SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW);
273 pclk = common_flags & (SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING);
274 data = common_flags & (SOCAM_DATA_ACTIVE_HIGH | SOCAM_DATA_ACTIVE_LOW);
275 mode = common_flags & (SOCAM_MASTER | SOCAM_SLAVE);
276 buswidth = common_flags & SOCAM_DATAWIDTH_MASK;
278 return (!hsync || !vsync || !pclk || !data || !mode || !buswidth) ? 0 :
282 static inline void soc_camera_limit_side(unsigned int *start,
283 unsigned int *length, unsigned int start_min,
284 unsigned int length_min, unsigned int length_max)
286 if (*length < length_min)
287 *length = length_min;
288 else if (*length > length_max)
289 *length = length_max;
291 if (*start < start_min)
293 else if (*start > start_min + length_max - *length)
294 *start = start_min + length_max - *length;
297 extern unsigned long soc_camera_apply_sensor_flags(struct soc_camera_link *icl,
298 unsigned long flags);