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_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