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1 | /* |
2 | * camera image capture (abstract) bus driver header |
3 | * |
4 | * Copyright (C) 2006, Sascha Hauer, Pengutronix |
5 | * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de> |
6 | * |
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. |
10 | */ |
11 | |
12 | #ifndef SOC_CAMERA_H |
13 | #define SOC_CAMERA_H |
14 | |
15 | #include <linux/bitops.h> |
16 | #include <linux/device.h> |
17 | #include <linux/mutex.h> |
18 | #include <linux/pm.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> |
24 | |
25 | struct file; |
26 | struct soc_camera_link; |
27 | |
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 */ |
34 | s32 user_width; |
35 | s32 user_height; |
36 | u32 bytesperline; /* for padding, zero if unused */ |
37 | u32 sizeimage; |
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; |
46 | int num_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 */ |
50 | int use_count; |
51 | struct mutex video_lock; /* Protects device data */ |
52 | struct file *streamer; /* stream owner */ |
53 | union { |
54 | struct videobuf_queue vb_vidq; |
55 | struct vb2_queue vb2_vidq; |
56 | }; |
57 | }; |
58 | |
59 | /* Host supports programmable stride */ |
60 | #define SOCAM_HOST_CAP_STRIDE (1 << 0) |
61 | |
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 */ |
67 | u32 capabilities; |
68 | void *priv; |
69 | const char *drv_name; |
70 | struct soc_camera_host_ops *ops; |
71 | }; |
72 | |
73 | struct soc_camera_host_ops { |
74 | struct module *owner; |
75 | int (*add)(struct soc_camera_device *); |
76 | void (*remove)(struct soc_camera_device *); |
77 | /* |
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. |
82 | */ |
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 *); |
89 | /* |
90 | * The difference to .set_crop() is, that .set_livecrop is not allowed |
91 | * to change the output sizes |
92 | */ |
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 *); |
107 | }; |
108 | |
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) |
114 | |
115 | struct i2c_board_info; |
116 | struct regulator_bulk_data; |
117 | |
118 | struct soc_camera_link { |
119 | /* Camera bus id, used to match a camera and a bus */ |
120 | int bus_id; |
121 | /* Per camera SOCAM_SENSOR_* bus flags */ |
122 | unsigned long flags; |
123 | int i2c_adapter_id; |
124 | struct i2c_board_info *board_info; |
125 | const char *module_name; |
126 | void *priv; |
127 | |
128 | /* Optional regulators that have to be managed on power on/off events */ |
129 | struct regulator_bulk_data *regulators; |
130 | int num_regulators; |
131 | |
132 | /* |
133 | * For non-I2C devices platform has to provide methods to add a device |
134 | * to the system and to remove it |
135 | */ |
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 *); |
141 | /* |
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. |
145 | */ |
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 *); |
149 | }; |
150 | |
151 | static inline struct soc_camera_host *to_soc_camera_host( |
152 | const struct device *dev) |
153 | { |
154 | struct v4l2_device *v4l2_dev = dev_get_drvdata(dev); |
155 | |
156 | return container_of(v4l2_dev, struct soc_camera_host, v4l2_dev); |
157 | } |
158 | |
159 | static inline struct soc_camera_link *to_soc_camera_link( |
160 | const struct soc_camera_device *icd) |
161 | { |
162 | return icd->link; |
163 | } |
164 | |
165 | static inline struct device *to_soc_camera_control( |
166 | const struct soc_camera_device *icd) |
167 | { |
168 | return icd->control; |
169 | } |
170 | |
171 | static inline struct v4l2_subdev *soc_camera_to_subdev( |
172 | const struct soc_camera_device *icd) |
173 | { |
174 | struct device *control = to_soc_camera_control(icd); |
175 | return dev_get_drvdata(control); |
176 | } |
177 | |
178 | int soc_camera_host_register(struct soc_camera_host *ici); |
179 | void soc_camera_host_unregister(struct soc_camera_host *ici); |
180 | |
181 | const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc( |
182 | struct soc_camera_device *icd, unsigned int fourcc); |
183 | |
184 | /** |
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 |
188 | * |
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 |
192 | * format setup. |
193 | */ |
194 | struct soc_camera_format_xlate { |
195 | enum v4l2_mbus_pixelcode code; |
196 | const struct soc_mbus_pixelfmt *host_fmt; |
197 | }; |
198 | |
199 | #define SOCAM_SENSE_PCLK_CHANGED (1 << 0) |
200 | |
201 | /** |
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. |
207 | * |
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 |
216 | * sets this field. |
217 | */ |
218 | struct soc_camera_sense { |
219 | unsigned long flags; |
220 | unsigned long master_clock; |
221 | unsigned long pixel_clock_max; |
222 | unsigned long pixel_clock; |
223 | }; |
224 | |
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) |
232 | |
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) |
236 | |
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) |
240 | { |
241 | if (*length < length_min) |
242 | *length = length_min; |
243 | else if (*length > length_max) |
244 | *length = length_max; |
245 | |
246 | if (*start < start_min) |
247 | *start = start_min; |
248 | else if (*start > start_min + length_max - *length) |
249 | *start = start_min + length_max - *length; |
250 | } |
251 | |
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); |
256 | |
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) |
260 | { |
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; |
264 | } |
265 | |
266 | static inline struct soc_camera_link *soc_camera_i2c_to_link(const struct i2c_client *client) |
267 | { |
268 | return client->dev.platform_data; |
269 | } |
270 | |
271 | static inline struct v4l2_subdev *soc_camera_vdev_to_subdev(const struct video_device *vdev) |
272 | { |
273 | struct soc_camera_device *icd = dev_get_drvdata(vdev->parent); |
274 | return soc_camera_to_subdev(icd); |
275 | } |
276 | |
277 | static inline struct soc_camera_device *soc_camera_from_vb2q(const struct vb2_queue *vq) |
278 | { |
279 | return container_of(vq, struct soc_camera_device, vb2_vidq); |
280 | } |
281 | |
282 | static inline struct soc_camera_device *soc_camera_from_vbq(const struct videobuf_queue *vq) |
283 | { |
284 | return container_of(vq, struct soc_camera_device, vb_vidq); |
285 | } |
286 | |
287 | static inline u32 soc_camera_grp_id(const struct soc_camera_device *icd) |
288 | { |
289 | return (icd->iface << 8) | (icd->devnum + 1); |
290 | } |
291 | |
292 | void soc_camera_lock(struct vb2_queue *vq); |
293 | void soc_camera_unlock(struct vb2_queue *vq); |
294 | |
295 | #endif |
296 |
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