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-v4l2.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 (*get_selection)(struct soc_camera_device *, struct v4l2_selection *);
 109         int (*set_selection)(struct soc_camera_device *, struct v4l2_selection *);
 110         /*
 111          * The difference to .set_selection() is, that .set_liveselection is not allowed
 112          * to change the output sizes
 113          */
 114         int (*set_liveselection)(struct soc_camera_device *, struct v4l2_selection *);
 115         int (*set_fmt)(struct soc_camera_device *, struct v4l2_format *);
 116         int (*try_fmt)(struct soc_camera_device *, struct v4l2_format *);
 117         void (*init_videobuf)(struct videobuf_queue *,
 118                               struct soc_camera_device *);
 119         int (*init_videobuf2)(struct vb2_queue *,
 120                               struct soc_camera_device *);
 121         int (*reqbufs)(struct soc_camera_device *, struct v4l2_requestbuffers *);
 122         int (*querycap)(struct soc_camera_host *, struct v4l2_capability *);
 123         int (*set_bus_param)(struct soc_camera_device *);
 124         int (*get_parm)(struct soc_camera_device *, struct v4l2_streamparm *);
 125         int (*set_parm)(struct soc_camera_device *, struct v4l2_streamparm *);
 126         int (*enum_framesizes)(struct soc_camera_device *, struct v4l2_frmsizeenum *);
 127         unsigned int (*poll)(struct file *, poll_table *);
 128 };
 129
 130 #define SOCAM_SENSOR_INVERT_PCLK        (1 << 0)
 131 #define SOCAM_SENSOR_INVERT_MCLK        (1 << 1)
 132 #define SOCAM_SENSOR_INVERT_HSYNC       (1 << 2)
 133 #define SOCAM_SENSOR_INVERT_VSYNC       (1 << 3)
 134 #define SOCAM_SENSOR_INVERT_DATA        (1 << 4)
 135
 136 struct i2c_board_info;
 137 struct regulator_bulk_data;
 138
 139 struct soc_camera_subdev_desc {
 140         /* Per camera SOCAM_SENSOR_* bus flags */
 141         unsigned long flags;
 142
 143         /* sensor driver private platform data */
 144         void *drv_priv;
 145
 146         /*
 147          * Set unbalanced_power to true to deal with legacy drivers, failing to
 148          * balance their calls to subdevice's .s_power() method. clock_state is
 149          * then used internally by helper functions, it shouldn't be touched by
 150          * drivers or the platform code.
 151          */
 152         bool unbalanced_power;
 153         unsigned long clock_state;
 154
 155         /* Optional callbacks to power on or off and reset the sensor */
 156         int (*power)(struct device *, int);
 157         int (*reset)(struct device *);
 158
 159         /*
 160          * some platforms may support different data widths than the sensors
 161          * native ones due to different data line routing. Let the board code
 162          * overwrite the width flags.
 163          */
 164         int (*set_bus_param)(struct soc_camera_subdev_desc *, unsigned long flags);
 165         unsigned long (*query_bus_param)(struct soc_camera_subdev_desc *);
 166         void (*free_bus)(struct soc_camera_subdev_desc *);
 167
 168         /* Optional regulators that have to be managed on power on/off events */
 169         struct v4l2_subdev_platform_data sd_pdata;
 170 };
 171
 172 struct soc_camera_host_desc {
 173         /* Camera bus id, used to match a camera and a bus */
 174         int bus_id;
 175         int i2c_adapter_id;
 176         struct i2c_board_info *board_info;
 177         const char *module_name;
 178
 179         /*
 180          * For non-I2C devices platform has to provide methods to add a device
 181          * to the system and to remove it
 182          */
 183         int (*add_device)(struct soc_camera_device *);
 184         void (*del_device)(struct soc_camera_device *);
 185 };
 186
 187 /*
 188  * Platform data for "soc-camera-pdrv"
 189  * This MUST be kept binary-identical to struct soc_camera_link below, until
 190  * it is completely replaced by this one, after which we can split it into its
 191  * two components.
 192  */
 193 struct soc_camera_desc {
 194         struct soc_camera_subdev_desc subdev_desc;
 195         struct soc_camera_host_desc host_desc;
 196 };
 197
 198 /* Prepare to replace this struct: don't change its layout any more! */
 199 struct soc_camera_link {
 200         /*
 201          * Subdevice part - keep at top and compatible to
 202          * struct soc_camera_subdev_desc
 203          */
 204
 205         /* Per camera SOCAM_SENSOR_* bus flags */
 206         unsigned long flags;
 207
 208         void *priv;
 209
 210         /* Set by platforms to handle misbehaving drivers */
 211         bool unbalanced_power;
 212         /* Used by soc-camera helper functions */
 213         unsigned long clock_state;
 214
 215         /* Optional callbacks to power on or off and reset the sensor */
 216         int (*power)(struct device *, int);
 217         int (*reset)(struct device *);
 218         /*
 219          * some platforms may support different data widths than the sensors
 220          * native ones due to different data line routing. Let the board code
 221          * overwrite the width flags.
 222          */
 223         int (*set_bus_param)(struct soc_camera_link *, unsigned long flags);
 224         unsigned long (*query_bus_param)(struct soc_camera_link *);
 225         void (*free_bus)(struct soc_camera_link *);
 226
 227         /* Optional regulators that have to be managed on power on/off events */
 228         struct regulator_bulk_data *regulators;
 229         int num_regulators;
 230
 231         void *host_priv;
 232
 233         /*
 234          * Host part - keep at bottom and compatible to
 235          * struct soc_camera_host_desc
 236          */
 237
 238         /* Camera bus id, used to match a camera and a bus */
 239         int bus_id;
 240         int i2c_adapter_id;
 241         struct i2c_board_info *board_info;
 242         const char *module_name;
 243
 244         /*
 245          * For non-I2C devices platform has to provide methods to add a device
 246          * to the system and to remove it
 247          */
 248         int (*add_device)(struct soc_camera_device *);
 249         void (*del_device)(struct soc_camera_device *);
 250 };
 251
 252 static inline struct soc_camera_host *to_soc_camera_host(
 253         const struct device *dev)
 254 {
 255         struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
 256
 257         return container_of(v4l2_dev, struct soc_camera_host, v4l2_dev);
 258 }
 259
 260 static inline struct soc_camera_desc *to_soc_camera_desc(
 261         const struct soc_camera_device *icd)
 262 {
 263         return icd->sdesc;
 264 }
 265
 266 static inline struct device *to_soc_camera_control(
 267         const struct soc_camera_device *icd)
 268 {
 269         return icd->control;
 270 }
 271
 272 static inline struct v4l2_subdev *soc_camera_to_subdev(
 273         const struct soc_camera_device *icd)
 274 {
 275         struct device *control = to_soc_camera_control(icd);
 276         return dev_get_drvdata(control);
 277 }
 278
 279 int soc_camera_host_register(struct soc_camera_host *ici);
 280 void soc_camera_host_unregister(struct soc_camera_host *ici);
 281
 282 const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
 283         struct soc_camera_device *icd, unsigned int fourcc);
 284
 285 /**
 286  * struct soc_camera_format_xlate - match between host and sensor formats
 287  * @code: code of a sensor provided format
 288  * @host_fmt: host format after host translation from code
 289  *
 290  * Host and sensor translation structure. Used in table of host and sensor
 291  * formats matchings in soc_camera_device. A host can override the generic list
 292  * generation by implementing get_formats(), and use it for format checks and
 293  * format setup.
 294  */
 295 struct soc_camera_format_xlate {
 296         u32 code;
 297         const struct soc_mbus_pixelfmt *host_fmt;
 298 };
 299
 300 #define SOCAM_SENSE_PCLK_CHANGED        (1 << 0)
 301
 302 /**
 303  * This struct can be attached to struct soc_camera_device by the host driver
 304  * to request sense from the camera, for example, when calling .set_fmt(). The
 305  * host then can check which flags are set and verify respective values if any.
 306  * For example, if SOCAM_SENSE_PCLK_CHANGED is set, it means, pixclock has
 307  * changed during this operation. After completion the host should detach sense.
 308  *
 309  * @flags               ored SOCAM_SENSE_* flags
 310  * @master_clock        if the host wants to be informed about pixel-clock
 311  *                      change, it better set master_clock.
 312  * @pixel_clock_max     maximum pixel clock frequency supported by the host,
 313  *                      camera is not allowed to exceed this.
 314  * @pixel_clock         if the camera driver changed pixel clock during this
 315  *                      operation, it sets SOCAM_SENSE_PCLK_CHANGED, uses
 316  *                      master_clock to calculate the new pixel-clock and
 317  *                      sets this field.
 318  */
 319 struct soc_camera_sense {
 320         unsigned long flags;
 321         unsigned long master_clock;
 322         unsigned long pixel_clock_max;
 323         unsigned long pixel_clock;
 324 };
 325
 326 #define SOCAM_DATAWIDTH(x)      BIT((x) - 1)
 327 #define SOCAM_DATAWIDTH_4       SOCAM_DATAWIDTH(4)
 328 #define SOCAM_DATAWIDTH_8       SOCAM_DATAWIDTH(8)
 329 #define SOCAM_DATAWIDTH_9       SOCAM_DATAWIDTH(9)
 330 #define SOCAM_DATAWIDTH_10      SOCAM_DATAWIDTH(10)
 331 #define SOCAM_DATAWIDTH_12      SOCAM_DATAWIDTH(12)
 332 #define SOCAM_DATAWIDTH_15      SOCAM_DATAWIDTH(15)
 333 #define SOCAM_DATAWIDTH_16      SOCAM_DATAWIDTH(16)
 334 #define SOCAM_DATAWIDTH_18      SOCAM_DATAWIDTH(18)
 335 #define SOCAM_DATAWIDTH_24      SOCAM_DATAWIDTH(24)
 336
 337 #define SOCAM_DATAWIDTH_MASK (SOCAM_DATAWIDTH_4 | SOCAM_DATAWIDTH_8 | \
 338                               SOCAM_DATAWIDTH_9 | SOCAM_DATAWIDTH_10 | \
 339                               SOCAM_DATAWIDTH_12 | SOCAM_DATAWIDTH_15 | \
 340                               SOCAM_DATAWIDTH_16 | SOCAM_DATAWIDTH_18 | \
 341                               SOCAM_DATAWIDTH_24)
 342
 343 static inline void soc_camera_limit_side(int *start, int *length,
 344                 unsigned int start_min,
 345                 unsigned int length_min, unsigned int length_max)
 346 {
 347         if (*length < length_min)
 348                 *length = length_min;
 349         else if (*length > length_max)
 350                 *length = length_max;
 351
 352         if (*start < start_min)
 353                 *start = start_min;
 354         else if (*start > start_min + length_max - *length)
 355                 *start = start_min + length_max - *length;
 356 }
 357
 358 unsigned long soc_camera_apply_board_flags(struct soc_camera_subdev_desc *ssdd,
 359                                            const struct v4l2_mbus_config *cfg);
 360
 361 int soc_camera_power_init(struct device *dev, struct soc_camera_subdev_desc *ssdd);
 362 int soc_camera_power_on(struct device *dev, struct soc_camera_subdev_desc *ssdd,
 363                         struct v4l2_clk *clk);
 364 int soc_camera_power_off(struct device *dev, struct soc_camera_subdev_desc *ssdd,
 365                          struct v4l2_clk *clk);
 366
 367 static inline int soc_camera_set_power(struct device *dev,
 368                 struct soc_camera_subdev_desc *ssdd, struct v4l2_clk *clk, bool on)
 369 {
 370         return on ? soc_camera_power_on(dev, ssdd, clk)
 371                   : soc_camera_power_off(dev, ssdd, clk);
 372 }
 373
 374 /* This is only temporary here - until v4l2-subdev begins to link to video_device */
 375 #include <linux/i2c.h>
 376 static inline struct video_device *soc_camera_i2c_to_vdev(const struct i2c_client *client)
 377 {
 378         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 379         struct soc_camera_device *icd = v4l2_get_subdev_hostdata(sd);
 380         return icd ? icd->vdev : NULL;
 381 }
 382
 383 static inline struct soc_camera_subdev_desc *soc_camera_i2c_to_desc(const struct i2c_client *client)
 384 {
 385         return client->dev.platform_data;
 386 }
 387
 388 static inline struct v4l2_subdev *soc_camera_vdev_to_subdev(struct video_device *vdev)
 389 {
 390         struct soc_camera_device *icd = video_get_drvdata(vdev);
 391         return soc_camera_to_subdev(icd);
 392 }
 393
 394 static inline struct soc_camera_device *soc_camera_from_vb2q(const struct vb2_queue *vq)
 395 {
 396         return container_of(vq, struct soc_camera_device, vb2_vidq);
 397 }
 398
 399 static inline struct soc_camera_device *soc_camera_from_vbq(const struct videobuf_queue *vq)
 400 {
 401         return container_of(vq, struct soc_camera_device, vb_vidq);
 402 }
 403
 404 static inline u32 soc_camera_grp_id(const struct soc_camera_device *icd)
 405 {
 406         return (icd->iface << 8) | (icd->devnum + 1);
 407 }
 408
 409 void soc_camera_lock(struct vb2_queue *vq);
 410 void soc_camera_unlock(struct vb2_queue *vq);
 411
 412 #endif