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