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/videobuf2-v4l2.h>
  21 #include <media/v4l2-async.h>
  22 #include <media/v4l2-ctrls.h>
  23 #include <media/v4l2-device.h>
  24
  25 struct file;
  26 struct soc_camera_desc;
  27 struct soc_camera_async_client;
  28
  29 struct soc_camera_device {
  30         struct list_head list;          /* list of all registered devices */
  31         struct soc_camera_desc *sdesc;
  32         struct device *pdev;            /* Platform device */
  33         struct device *parent;          /* Camera host device */
  34         struct device *control;         /* E.g., the i2c client */
  35         s32 user_width;
  36         s32 user_height;
  37         u32 bytesperline;               /* for padding, zero if unused */
  38         u32 sizeimage;
  39         enum v4l2_colorspace colorspace;
  40         unsigned char iface;            /* Host number */
  41         unsigned char devnum;           /* Device number per host */
  42         struct soc_camera_sense *sense; /* See comment in struct definition */
  43         struct video_device *vdev;
  44         struct v4l2_ctrl_handler ctrl_handler;
  45         const struct soc_camera_format_xlate *current_fmt;
  46         struct soc_camera_format_xlate *user_formats;
  47         int num_user_formats;
  48         enum v4l2_field field;          /* Preserve field over close() */
  49         void *host_priv;                /* Per-device host private data */
  50         /* soc_camera.c private count. Only accessed with .host_lock held */
  51         int use_count;
  52         struct file *streamer;          /* stream owner */
  53         struct v4l2_clk *clk;
  54         /* Asynchronous subdevice management */
  55         struct soc_camera_async_client *sasc;
  56         /* video buffer queue */
  57         struct vb2_queue vb2_vidq;
  58 };
  59
  60 /* Host supports programmable stride */
  61 #define SOCAM_HOST_CAP_STRIDE           (1 << 0)
  62
  63 enum soc_camera_subdev_role {
  64         SOCAM_SUBDEV_DATA_SOURCE = 1,
  65         SOCAM_SUBDEV_DATA_SINK,
  66         SOCAM_SUBDEV_DATA_PROCESSOR,
  67 };
  68
  69 struct soc_camera_async_subdev {
  70         struct v4l2_async_subdev asd;
  71         enum soc_camera_subdev_role role;
  72 };
  73
  74 struct soc_camera_host {
  75         struct v4l2_device v4l2_dev;
  76         struct list_head list;
  77         struct mutex host_lock;         /* Main synchronisation lock */
  78         struct mutex clk_lock;          /* Protect pipeline modifications */
  79         unsigned char nr;               /* Host number */
  80         u32 capabilities;
  81         struct soc_camera_device *icd;  /* Currently attached client */
  82         void *priv;
  83         const char *drv_name;
  84         struct soc_camera_host_ops *ops;
  85         struct v4l2_async_subdev **asd; /* Flat array, arranged in groups */
  86         unsigned int *asd_sizes;        /* 0-terminated array of asd group sizes */
  87 };
  88
  89 struct soc_camera_host_ops {
  90         struct module *owner;
  91         int (*add)(struct soc_camera_device *);
  92         void (*remove)(struct soc_camera_device *);
  93         int (*clock_start)(struct soc_camera_host *);
  94         void (*clock_stop)(struct soc_camera_host *);
  95         /*
  96          * .get_formats() is called for each client device format, but
  97          * .put_formats() is only called once. Further, if any of the calls to
  98          * .get_formats() fail, .put_formats() will not be called at all, the
  99          * failing .get_formats() must then clean up internally.
 100          */
 101         int (*get_formats)(struct soc_camera_device *, unsigned int,
 102                            struct soc_camera_format_xlate *);
 103         void (*put_formats)(struct soc_camera_device *);
 104         int (*get_selection)(struct soc_camera_device *, struct v4l2_selection *);
 105         int (*set_selection)(struct soc_camera_device *, struct v4l2_selection *);
 106         /*
 107          * The difference to .set_selection() is, that .set_liveselection is not allowed
 108          * to change the output sizes
 109          */
 110         int (*set_liveselection)(struct soc_camera_device *, struct v4l2_selection *);
 111         int (*set_fmt)(struct soc_camera_device *, struct v4l2_format *);
 112         int (*try_fmt)(struct soc_camera_device *, struct v4l2_format *);
 113         int (*init_videobuf2)(struct vb2_queue *,
 114                               struct soc_camera_device *);
 115         int (*querycap)(struct soc_camera_host *, struct v4l2_capability *);
 116         int (*set_bus_param)(struct soc_camera_device *);
 117         int (*get_parm)(struct soc_camera_device *, struct v4l2_streamparm *);
 118         int (*set_parm)(struct soc_camera_device *, struct v4l2_streamparm *);
 119         int (*enum_framesizes)(struct soc_camera_device *, struct v4l2_frmsizeenum *);
 120         unsigned int (*poll)(struct file *, poll_table *);
 121 };
 122
 123 #define SOCAM_SENSOR_INVERT_PCLK        (1 << 0)
 124 #define SOCAM_SENSOR_INVERT_MCLK        (1 << 1)
 125 #define SOCAM_SENSOR_INVERT_HSYNC       (1 << 2)
 126 #define SOCAM_SENSOR_INVERT_VSYNC       (1 << 3)
 127 #define SOCAM_SENSOR_INVERT_DATA        (1 << 4)
 128
 129 struct i2c_board_info;
 130 struct regulator_bulk_data;
 131
 132 struct soc_camera_subdev_desc {
 133         /* Per camera SOCAM_SENSOR_* bus flags */
 134         unsigned long flags;
 135
 136         /* sensor driver private platform data */
 137         void *drv_priv;
 138
 139         /*
 140          * Set unbalanced_power to true to deal with legacy drivers, failing to
 141          * balance their calls to subdevice's .s_power() method. clock_state is
 142          * then used internally by helper functions, it shouldn't be touched by
 143          * drivers or the platform code.
 144          */
 145         bool unbalanced_power;
 146         unsigned long clock_state;
 147
 148         /* Optional callbacks to power on or off and reset the sensor */
 149         int (*power)(struct device *, int);
 150         int (*reset)(struct device *);
 151
 152         /*
 153          * some platforms may support different data widths than the sensors
 154          * native ones due to different data line routing. Let the board code
 155          * overwrite the width flags.
 156          */
 157         int (*set_bus_param)(struct soc_camera_subdev_desc *, unsigned long flags);
 158         unsigned long (*query_bus_param)(struct soc_camera_subdev_desc *);
 159         void (*free_bus)(struct soc_camera_subdev_desc *);
 160
 161         /* Optional regulators that have to be managed on power on/off events */
 162         struct v4l2_subdev_platform_data sd_pdata;
 163 };
 164
 165 struct soc_camera_host_desc {
 166         /* Camera bus id, used to match a camera and a bus */
 167         int bus_id;
 168         int i2c_adapter_id;
 169         struct i2c_board_info *board_info;
 170         const char *module_name;
 171
 172         /*
 173          * For non-I2C devices platform has to provide methods to add a device
 174          * to the system and to remove it
 175          */
 176         int (*add_device)(struct soc_camera_device *);
 177         void (*del_device)(struct soc_camera_device *);
 178 };
 179
 180 /*
 181  * Platform data for "soc-camera-pdrv"
 182  * This MUST be kept binary-identical to struct soc_camera_link below, until
 183  * it is completely replaced by this one, after which we can split it into its
 184  * two components.
 185  */
 186 struct soc_camera_desc {
 187         struct soc_camera_subdev_desc subdev_desc;
 188         struct soc_camera_host_desc host_desc;
 189 };
 190
 191 /* Prepare to replace this struct: don't change its layout any more! */
 192 struct soc_camera_link {
 193         /*
 194          * Subdevice part - keep at top and compatible to
 195          * struct soc_camera_subdev_desc
 196          */
 197
 198         /* Per camera SOCAM_SENSOR_* bus flags */
 199         unsigned long flags;
 200
 201         void *priv;
 202
 203         /* Set by platforms to handle misbehaving drivers */
 204         bool unbalanced_power;
 205         /* Used by soc-camera helper functions */
 206         unsigned long clock_state;
 207
 208         /* Optional callbacks to power on or off and reset the sensor */
 209         int (*power)(struct device *, int);
 210         int (*reset)(struct device *);
 211         /*
 212          * some platforms may support different data widths than the sensors
 213          * native ones due to different data line routing. Let the board code
 214          * overwrite the width flags.
 215          */
 216         int (*set_bus_param)(struct soc_camera_link *, unsigned long flags);
 217         unsigned long (*query_bus_param)(struct soc_camera_link *);
 218         void (*free_bus)(struct soc_camera_link *);
 219
 220         /* Optional regulators that have to be managed on power on/off events */
 221         struct regulator_bulk_data *regulators;
 222         int num_regulators;
 223
 224         void *host_priv;
 225
 226         /*
 227          * Host part - keep at bottom and compatible to
 228          * struct soc_camera_host_desc
 229          */
 230
 231         /* Camera bus id, used to match a camera and a bus */
 232         int bus_id;
 233         int i2c_adapter_id;
 234         struct i2c_board_info *board_info;
 235         const char *module_name;
 236
 237         /*
 238          * For non-I2C devices platform has to provide methods to add a device
 239          * to the system and to remove it
 240          */
 241         int (*add_device)(struct soc_camera_device *);
 242         void (*del_device)(struct soc_camera_device *);
 243 };
 244
 245 static inline struct soc_camera_host *to_soc_camera_host(
 246         const struct device *dev)
 247 {
 248         struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
 249
 250         return container_of(v4l2_dev, struct soc_camera_host, v4l2_dev);
 251 }
 252
 253 static inline struct soc_camera_desc *to_soc_camera_desc(
 254         const struct soc_camera_device *icd)
 255 {
 256         return icd->sdesc;
 257 }
 258
 259 static inline struct device *to_soc_camera_control(
 260         const struct soc_camera_device *icd)
 261 {
 262         return icd->control;
 263 }
 264
 265 static inline struct v4l2_subdev *soc_camera_to_subdev(
 266         const struct soc_camera_device *icd)
 267 {
 268         struct device *control = to_soc_camera_control(icd);
 269         return dev_get_drvdata(control);
 270 }
 271
 272 int soc_camera_host_register(struct soc_camera_host *ici);
 273 void soc_camera_host_unregister(struct soc_camera_host *ici);
 274
 275 const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
 276         struct soc_camera_device *icd, unsigned int fourcc);
 277
 278 /**
 279  * struct soc_camera_format_xlate - match between host and sensor formats
 280  * @code: code of a sensor provided format
 281  * @host_fmt: host format after host translation from code
 282  *
 283  * Host and sensor translation structure. Used in table of host and sensor
 284  * formats matchings in soc_camera_device. A host can override the generic list
 285  * generation by implementing get_formats(), and use it for format checks and
 286  * format setup.
 287  */
 288 struct soc_camera_format_xlate {
 289         u32 code;
 290         const struct soc_mbus_pixelfmt *host_fmt;
 291 };
 292
 293 #define SOCAM_SENSE_PCLK_CHANGED        (1 << 0)
 294
 295 /**
 296  * This struct can be attached to struct soc_camera_device by the host driver
 297  * to request sense from the camera, for example, when calling .set_fmt(). The
 298  * host then can check which flags are set and verify respective values if any.
 299  * For example, if SOCAM_SENSE_PCLK_CHANGED is set, it means, pixclock has
 300  * changed during this operation. After completion the host should detach sense.
 301  *
 302  * @flags               ored SOCAM_SENSE_* flags
 303  * @master_clock        if the host wants to be informed about pixel-clock
 304  *                      change, it better set master_clock.
 305  * @pixel_clock_max     maximum pixel clock frequency supported by the host,
 306  *                      camera is not allowed to exceed this.
 307  * @pixel_clock         if the camera driver changed pixel clock during this
 308  *                      operation, it sets SOCAM_SENSE_PCLK_CHANGED, uses
 309  *                      master_clock to calculate the new pixel-clock and
 310  *                      sets this field.
 311  */
 312 struct soc_camera_sense {
 313         unsigned long flags;
 314         unsigned long master_clock;
 315         unsigned long pixel_clock_max;
 316         unsigned long pixel_clock;
 317 };
 318
 319 #define SOCAM_DATAWIDTH(x)      BIT((x) - 1)
 320 #define SOCAM_DATAWIDTH_4       SOCAM_DATAWIDTH(4)
 321 #define SOCAM_DATAWIDTH_8       SOCAM_DATAWIDTH(8)
 322 #define SOCAM_DATAWIDTH_9       SOCAM_DATAWIDTH(9)
 323 #define SOCAM_DATAWIDTH_10      SOCAM_DATAWIDTH(10)
 324 #define SOCAM_DATAWIDTH_12      SOCAM_DATAWIDTH(12)
 325 #define SOCAM_DATAWIDTH_15      SOCAM_DATAWIDTH(15)
 326 #define SOCAM_DATAWIDTH_16      SOCAM_DATAWIDTH(16)
 327 #define SOCAM_DATAWIDTH_18      SOCAM_DATAWIDTH(18)
 328 #define SOCAM_DATAWIDTH_24      SOCAM_DATAWIDTH(24)
 329
 330 #define SOCAM_DATAWIDTH_MASK (SOCAM_DATAWIDTH_4 | SOCAM_DATAWIDTH_8 | \
 331                               SOCAM_DATAWIDTH_9 | SOCAM_DATAWIDTH_10 | \
 332                               SOCAM_DATAWIDTH_12 | SOCAM_DATAWIDTH_15 | \
 333                               SOCAM_DATAWIDTH_16 | SOCAM_DATAWIDTH_18 | \
 334                               SOCAM_DATAWIDTH_24)
 335
 336 static inline void soc_camera_limit_side(int *start, int *length,
 337                 unsigned int start_min,
 338                 unsigned int length_min, unsigned int length_max)
 339 {
 340         if (*length < length_min)
 341                 *length = length_min;
 342         else if (*length > length_max)
 343                 *length = length_max;
 344
 345         if (*start < start_min)
 346                 *start = start_min;
 347         else if (*start > start_min + length_max - *length)
 348                 *start = start_min + length_max - *length;
 349 }
 350
 351 unsigned long soc_camera_apply_board_flags(struct soc_camera_subdev_desc *ssdd,
 352                                            const struct v4l2_mbus_config *cfg);
 353
 354 int soc_camera_power_init(struct device *dev, struct soc_camera_subdev_desc *ssdd);
 355 int soc_camera_power_on(struct device *dev, struct soc_camera_subdev_desc *ssdd,
 356                         struct v4l2_clk *clk);
 357 int soc_camera_power_off(struct device *dev, struct soc_camera_subdev_desc *ssdd,
 358                          struct v4l2_clk *clk);
 359
 360 static inline int soc_camera_set_power(struct device *dev,
 361                 struct soc_camera_subdev_desc *ssdd, struct v4l2_clk *clk, bool on)
 362 {
 363         return on ? soc_camera_power_on(dev, ssdd, clk)
 364                   : soc_camera_power_off(dev, ssdd, clk);
 365 }
 366
 367 /* This is only temporary here - until v4l2-subdev begins to link to video_device */
 368 #include <linux/i2c.h>
 369 static inline struct video_device *soc_camera_i2c_to_vdev(const struct i2c_client *client)
 370 {
 371         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 372         struct soc_camera_device *icd = v4l2_get_subdev_hostdata(sd);
 373         return icd ? icd->vdev : NULL;
 374 }
 375
 376 static inline struct soc_camera_subdev_desc *soc_camera_i2c_to_desc(const struct i2c_client *client)
 377 {
 378         return client->dev.platform_data;
 379 }
 380
 381 static inline struct v4l2_subdev *soc_camera_vdev_to_subdev(struct video_device *vdev)
 382 {
 383         struct soc_camera_device *icd = video_get_drvdata(vdev);
 384         return soc_camera_to_subdev(icd);
 385 }
 386
 387 static inline struct soc_camera_device *soc_camera_from_vb2q(const struct vb2_queue *vq)
 388 {
 389         return container_of(vq, struct soc_camera_device, vb2_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