include/media/soc_camera.h

   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-async.h>
  23 #include <media/v4l2-ctrls.h>
  24 #include <media/v4l2-device.h>
  25
  26 struct file;
  27 struct soc_camera_desc;
  28 struct soc_camera_async_client;
  29
  30 struct soc_camera_device {
  31         struct list_head list;          /* list of all registered devices */
  32         struct soc_camera_desc *sdesc;
  33         struct device *pdev;            /* Platform device */
  34         struct device *parent;          /* Camera host device */
  35         struct device *control;         /* E.g., the i2c client */
  36         s32 user_width;
  37         s32 user_height;
  38         u32 bytesperline;               /* for padding, zero if unused */
  39         u32 sizeimage;
  40         enum v4l2_colorspace colorspace;
  41         unsigned char iface;            /* Host number */
  42         unsigned char devnum;           /* Device number per host */
  43         struct soc_camera_sense *sense; /* See comment in struct definition */
  44         struct video_device *vdev;
  45         struct v4l2_ctrl_handler ctrl_handler;
  46         const struct soc_camera_format_xlate *current_fmt;
  47         struct soc_camera_format_xlate *user_formats;
  48         int num_user_formats;
  49         enum v4l2_field field;          /* Preserve field over close() */
  50         void *host_priv;                /* Per-device host private data */
  51         /* soc_camera.c private count. Only accessed with .host_lock held */
  52         int use_count;
  53         struct file *streamer;          /* stream owner */
  54         struct v4l2_clk *clk;
  55         /* Asynchronous subdevice management */
  56         struct soc_camera_async_client *sasc;
  57         /* video buffer queue */
  58         union {
  59                 struct videobuf_queue vb_vidq;
  60                 struct vb2_queue vb2_vidq;
  61         };
  62 };
  63
  64 /* Host supports programmable stride */
  65 #define SOCAM_HOST_CAP_STRIDE           (1 << 0)
  66
  67 enum soc_camera_subdev_role {
  68         SOCAM_SUBDEV_DATA_SOURCE = 1,
  69         SOCAM_SUBDEV_DATA_SINK,
  70         SOCAM_SUBDEV_DATA_PROCESSOR,
  71 };
  72
  73 struct soc_camera_async_subdev {
  74         struct v4l2_async_subdev asd;
  75         enum soc_camera_subdev_role role;
  76 };
  77
  78 struct soc_camera_host {
  79         struct v4l2_device v4l2_dev;
  80         struct list_head list;
  81         struct mutex host_lock;         /* Main synchronisation lock */
  82         struct mutex clk_lock;          /* Protect pipeline modifications */
  83         unsigned char nr;               /* Host number */
  84         u32 capabilities;
  85         struct soc_camera_device *icd;  /* Currently attached client */
  86         void *priv;
  87         const char *drv_name;
  88         struct soc_camera_host_ops *ops;
  89         struct v4l2_async_subdev **asd; /* Flat array, arranged in groups */
  90         unsigned int *asd_sizes;        /* 0-terminated array of asd group sizes */
  91 };
  92
  93 struct soc_camera_host_ops {
  94         struct module *owner;
  95         int (*add)(struct soc_camera_device *);
  96         void (*remove)(struct soc_camera_device *);
  97         int (*clock_start)(struct soc_camera_host *);
  98         void (*clock_stop)(struct soc_camera_host *);
  99         /*
 100          * .get_formats() is called for each client device format, but
 101          * .put_formats() is only called once. Further, if any of the calls to
 102          * .get_formats() fail, .put_formats() will not be called at all, the
 103          * failing .get_formats() must then clean up internally.
 104          */
 105         int (*get_formats)(struct soc_camera_device *, unsigned int,
 106                            struct soc_camera_format_xlate *);
 107         void (*put_formats)(struct soc_camera_device *);
 108         int (*cropcap)(struct soc_camera_device *, struct v4l2_cropcap *);
 109         int (*get_crop)(struct soc_camera_device *, struct v4l2_crop *);
 110         int (*set_crop)(struct soc_camera_device *, const struct v4l2_crop *);
 111         int (*get_selection)(struct soc_camera_device *, struct v4l2_selection *);
 112         int (*set_selection)(struct soc_camera_device *, struct v4l2_selection *);
 113         /*
 114          * The difference to .set_crop() is, that .set_livecrop is not allowed
 115          * to change the output sizes
 116          */
 117         int (*set_livecrop)(struct soc_camera_device *, const struct v4l2_crop *);
 118         int (*set_fmt)(struct soc_camera_device *, struct v4l2_format *);
 119         int (*try_fmt)(struct soc_camera_device *, struct v4l2_format *);
 120         void (*init_videobuf)(struct videobuf_queue *,
 121                               struct soc_camera_device *);
 122         int (*init_videobuf2)(struct vb2_queue *,
 123                               struct soc_camera_device *);
 124         int (*reqbufs)(struct soc_camera_device *, struct v4l2_requestbuffers *);
 125         int (*querycap)(struct soc_camera_host *, struct v4l2_capability *);
 126         int (*set_bus_param)(struct soc_camera_device *);
 127         int (*get_parm)(struct soc_camera_device *, struct v4l2_streamparm *);
 128         int (*set_parm)(struct soc_camera_device *, struct v4l2_streamparm *);
 129         int (*enum_framesizes)(struct soc_camera_device *, struct v4l2_frmsizeenum *);
 130         unsigned int (*poll)(struct file *, poll_table *);
 131 };
 132
 133 #define SOCAM_SENSOR_INVERT_PCLK        (1 << 0)
 134 #define SOCAM_SENSOR_INVERT_MCLK        (1 << 1)
 135 #define SOCAM_SENSOR_INVERT_HSYNC       (1 << 2)
 136 #define SOCAM_SENSOR_INVERT_VSYNC       (1 << 3)
 137 #define SOCAM_SENSOR_INVERT_DATA        (1 << 4)
 138
 139 struct i2c_board_info;
 140 struct regulator_bulk_data;
 141
 142 struct soc_camera_subdev_desc {
 143         /* Per camera SOCAM_SENSOR_* bus flags */
 144         unsigned long flags;
 145
 146         /* sensor driver private platform data */
 147         void *drv_priv;
 148
 149         /* Optional regulators that have to be managed on power on/off events */
 150         struct regulator_bulk_data *regulators;
 151         int num_regulators;
 152
 153         /* Optional callbacks to power on or off and reset the sensor */
 154         int (*power)(struct device *, int);
 155         int (*reset)(struct device *);
 156
 157         /*
 158          * some platforms may support different data widths than the sensors
 159          * native ones due to different data line routing. Let the board code
 160          * overwrite the width flags.
 161          */
 162         int (*set_bus_param)(struct soc_camera_subdev_desc *, unsigned long flags);
 163         unsigned long (*query_bus_param)(struct soc_camera_subdev_desc *);
 164         void (*free_bus)(struct soc_camera_subdev_desc *);
 165 };
 166
 167 struct soc_camera_host_desc {
 168         /* Camera bus id, used to match a camera and a bus */
 169         int bus_id;
 170         int i2c_adapter_id;
 171         struct i2c_board_info *board_info;
 172         const char *module_name;
 173
 174         /*
 175          * For non-I2C devices platform has to provide methods to add a device
 176          * to the system and to remove it
 177          */
 178         int (*add_device)(struct soc_camera_device *);
 179         void (*del_device)(struct soc_camera_device *);
 180 };
 181
 182 /*
 183  * Platform data for "soc-camera-pdrv"
 184  * This MUST be kept binary-identical to struct soc_camera_link below, until
 185  * it is completely replaced by this one, after which we can split it into its
 186  * two components.
 187  */
 188 struct soc_camera_desc {
 189         struct soc_camera_subdev_desc subdev_desc;
 190         struct soc_camera_host_desc host_desc;
 191 };
 192
 193 /* Prepare to replace this struct: don't change its layout any more! */
 194 struct soc_camera_link {
 195         /*
 196          * Subdevice part - keep at top and compatible to
 197          * struct soc_camera_subdev_desc
 198          */
 199
 200         /* Per camera SOCAM_SENSOR_* bus flags */
 201         unsigned long flags;
 202
 203         void *priv;
 204
 205         /* Optional regulators that have to be managed on power on/off events */
 206         struct regulator_bulk_data *regulators;
 207         int num_regulators;
 208
 209         /* Optional callbacks to power on or off and reset the sensor */
 210         int (*power)(struct device *, int);
 211         int (*reset)(struct device *);
 212         /*
 213          * some platforms may support different data widths than the sensors
 214          * native ones due to different data line routing. Let the board code
 215          * overwrite the width flags.
 216          */
 217         int (*set_bus_param)(struct soc_camera_link *, unsigned long flags);
 218         unsigned long (*query_bus_param)(struct soc_camera_link *);
 219         void (*free_bus)(struct soc_camera_link *);
 220
 221         /*
 222          * Host part - keep at bottom and compatible to
 223          * struct soc_camera_host_desc
 224          */
 225
 226         /* Camera bus id, used to match a camera and a bus */
 227         int bus_id;
 228         int i2c_adapter_id;
 229         struct i2c_board_info *board_info;
 230         const char *module_name;
 231
 232         /*
 233          * For non-I2C devices platform has to provide methods to add a device
 234          * to the system and to remove it
 235          */
 236         int (*add_device)(struct soc_camera_device *);
 237         void (*del_device)(struct soc_camera_device *);
 238 };
 239
 240 static inline struct soc_camera_host *to_soc_camera_host(
 241         const struct device *dev)
 242 {
 243         struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
 244
 245         return container_of(v4l2_dev, struct soc_camera_host, v4l2_dev);
 246 }
 247
 248 static inline struct soc_camera_desc *to_soc_camera_desc(
 249         const struct soc_camera_device *icd)
 250 {
 251         return icd->sdesc;
 252 }
 253
 254 static inline struct device *to_soc_camera_control(
 255         const struct soc_camera_device *icd)
 256 {
 257         return icd->control;
 258 }
 259
 260 static inline struct v4l2_subdev *soc_camera_to_subdev(
 261         const struct soc_camera_device *icd)
 262 {
 263         struct device *control = to_soc_camera_control(icd);
 264         return dev_get_drvdata(control);
 265 }
 266
 267 int soc_camera_host_register(struct soc_camera_host *ici);
 268 void soc_camera_host_unregister(struct soc_camera_host *ici);
 269
 270 const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
 271         struct soc_camera_device *icd, unsigned int fourcc);
 272
 273 /**
 274  * struct soc_camera_format_xlate - match between host and sensor formats
 275  * @code: code of a sensor provided format
 276  * @host_fmt: host format after host translation from code
 277  *
 278  * Host and sensor translation structure. Used in table of host and sensor
 279  * formats matchings in soc_camera_device. A host can override the generic list
 280  * generation by implementing get_formats(), and use it for format checks and
 281  * format setup.
 282  */
 283 struct soc_camera_format_xlate {
 284         enum v4l2_mbus_pixelcode code;
 285         const struct soc_mbus_pixelfmt *host_fmt;
 286 };
 287
 288 #define SOCAM_SENSE_PCLK_CHANGED        (1 << 0)
 289
 290 /**
 291  * This struct can be attached to struct soc_camera_device by the host driver
 292  * to request sense from the camera, for example, when calling .set_fmt(). The
 293  * host then can check which flags are set and verify respective values if any.
 294  * For example, if SOCAM_SENSE_PCLK_CHANGED is set, it means, pixclock has
 295  * changed during this operation. After completion the host should detach sense.
 296  *
 297  * @flags               ored SOCAM_SENSE_* flags
 298  * @master_clock        if the host wants to be informed about pixel-clock
 299  *                      change, it better set master_clock.
 300  * @pixel_clock_max     maximum pixel clock frequency supported by the host,
 301  *                      camera is not allowed to exceed this.
 302  * @pixel_clock         if the camera driver changed pixel clock during this
 303  *                      operation, it sets SOCAM_SENSE_PCLK_CHANGED, uses
 304  *                      master_clock to calculate the new pixel-clock and
 305  *                      sets this field.
 306  */
 307 struct soc_camera_sense {
 308         unsigned long flags;
 309         unsigned long master_clock;
 310         unsigned long pixel_clock_max;
 311         unsigned long pixel_clock;
 312 };
 313
 314 #define SOCAM_DATAWIDTH(x)      BIT((x) - 1)
 315 #define SOCAM_DATAWIDTH_4       SOCAM_DATAWIDTH(4)
 316 #define SOCAM_DATAWIDTH_8       SOCAM_DATAWIDTH(8)
 317 #define SOCAM_DATAWIDTH_9       SOCAM_DATAWIDTH(9)
 318 #define SOCAM_DATAWIDTH_10      SOCAM_DATAWIDTH(10)
 319 #define SOCAM_DATAWIDTH_12      SOCAM_DATAWIDTH(12)
 320 #define SOCAM_DATAWIDTH_15      SOCAM_DATAWIDTH(15)
 321 #define SOCAM_DATAWIDTH_16      SOCAM_DATAWIDTH(16)
 322 #define SOCAM_DATAWIDTH_18      SOCAM_DATAWIDTH(18)
 323 #define SOCAM_DATAWIDTH_24      SOCAM_DATAWIDTH(24)
 324
 325 #define SOCAM_DATAWIDTH_MASK (SOCAM_DATAWIDTH_4 | SOCAM_DATAWIDTH_8 | \
 326                               SOCAM_DATAWIDTH_9 | SOCAM_DATAWIDTH_10 | \
 327                               SOCAM_DATAWIDTH_12 | SOCAM_DATAWIDTH_15 | \
 328                               SOCAM_DATAWIDTH_16 | SOCAM_DATAWIDTH_18 | \
 329                               SOCAM_DATAWIDTH_24)
 330
 331 static inline void soc_camera_limit_side(int *start, int *length,
 332                 unsigned int start_min,
 333                 unsigned int length_min, unsigned int length_max)
 334 {
 335         if (*length < length_min)
 336                 *length = length_min;
 337         else if (*length > length_max)
 338                 *length = length_max;
 339
 340         if (*start < start_min)
 341                 *start = start_min;
 342         else if (*start > start_min + length_max - *length)
 343                 *start = start_min + length_max - *length;
 344 }
 345
 346 unsigned long soc_camera_apply_board_flags(struct soc_camera_subdev_desc *ssdd,
 347                                            const struct v4l2_mbus_config *cfg);
 348
 349 int soc_camera_power_init(struct device *dev, struct soc_camera_subdev_desc *ssdd);
 350 int soc_camera_power_on(struct device *dev, struct soc_camera_subdev_desc *ssdd,
 351                         struct v4l2_clk *clk);
 352 int soc_camera_power_off(struct device *dev, struct soc_camera_subdev_desc *ssdd,
 353                          struct v4l2_clk *clk);
 354
 355 static inline int soc_camera_set_power(struct device *dev,
 356                 struct soc_camera_subdev_desc *ssdd, struct v4l2_clk *clk, bool on)
 357 {
 358         return on ? soc_camera_power_on(dev, ssdd, clk)
 359                   : soc_camera_power_off(dev, ssdd, clk);
 360 }
 361
 362 /* This is only temporary here - until v4l2-subdev begins to link to video_device */
 363 #include <linux/i2c.h>
 364 static inline struct video_device *soc_camera_i2c_to_vdev(const struct i2c_client *client)
 365 {
 366         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 367         struct soc_camera_device *icd = v4l2_get_subdev_hostdata(sd);
 368         return icd ? icd->vdev : NULL;
 369 }
 370
 371 static inline struct soc_camera_subdev_desc *soc_camera_i2c_to_desc(const struct i2c_client *client)
 372 {
 373         return client->dev.platform_data;
 374 }
 375
 376 static inline struct v4l2_subdev *soc_camera_vdev_to_subdev(struct video_device *vdev)
 377 {
 378         struct soc_camera_device *icd = video_get_drvdata(vdev);
 379         return soc_camera_to_subdev(icd);
 380 }
 381
 382 static inline struct soc_camera_device *soc_camera_from_vb2q(const struct vb2_queue *vq)
 383 {
 384         return container_of(vq, struct soc_camera_device, vb2_vidq);
 385 }
 386
 387 static inline struct soc_camera_device *soc_camera_from_vbq(const struct videobuf_queue *vq)
 388 {
 389         return container_of(vq, struct soc_camera_device, vb_vidq);
 390 }
 391
 392 static inline u32 soc_camera_grp_id(const struct soc_camera_device *icd)
 393 {
 394         return (icd->iface << 8) | (icd->devnum + 1);
 395 }
 396
 397 void soc_camera_lock(struct vb2_queue *vq);
 398 void soc_camera_unlock(struct vb2_queue *vq);
 399
 400 #endif