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/device.h>
  16 #include <linux/mutex.h>
  17 #include <linux/pm.h>
  18 #include <linux/videodev2.h>
  19 #include <media/videobuf-core.h>
  20 #include <media/videobuf2-core.h>
  21 #include <media/v4l2-device.h>
  22
  23 extern struct bus_type soc_camera_bus_type;
  24
  25 struct file;
  26
  27 struct soc_camera_device {
  28         struct list_head list;
  29         struct device dev;
  30         struct device *pdev;            /* Platform device */
  31         s32 user_width;
  32         s32 user_height;
  33         u32 bytesperline;               /* for padding, zero if unused */
  34         u32 sizeimage;
  35         enum v4l2_colorspace colorspace;
  36         unsigned char iface;            /* Host number */
  37         unsigned char devnum;           /* Device number per host */
  38         struct soc_camera_sense *sense; /* See comment in struct definition */
  39         struct soc_camera_ops *ops;
  40         struct video_device *vdev;
  41         const struct soc_camera_format_xlate *current_fmt;
  42         struct soc_camera_format_xlate *user_formats;
  43         int num_user_formats;
  44         enum v4l2_field field;          /* Preserve field over close() */
  45         void *host_priv;                /* Per-device host private data */
  46         /* soc_camera.c private count. Only accessed with .video_lock held */
  47         int use_count;
  48         struct mutex video_lock;        /* Protects device data */
  49         struct file *streamer;          /* stream owner */
  50         union {
  51                 struct videobuf_queue vb_vidq;
  52                 struct vb2_queue vb2_vidq;
  53         };
  54 };
  55
  56 struct soc_camera_host {
  57         struct v4l2_device v4l2_dev;
  58         struct list_head list;
  59         unsigned char nr;                               /* Host number */
  60         void *priv;
  61         const char *drv_name;
  62         struct soc_camera_host_ops *ops;
  63 };
  64
  65 struct soc_camera_host_ops {
  66         struct module *owner;
  67         int (*add)(struct soc_camera_device *);
  68         void (*remove)(struct soc_camera_device *);
  69         int (*suspend)(struct soc_camera_device *, pm_message_t);
  70         int (*resume)(struct soc_camera_device *);
  71         /*
  72          * .get_formats() is called for each client device format, but
  73          * .put_formats() is only called once. Further, if any of the calls to
  74          * .get_formats() fail, .put_formats() will not be called at all, the
  75          * failing .get_formats() must then clean up internally.
  76          */
  77         int (*get_formats)(struct soc_camera_device *, unsigned int,
  78                            struct soc_camera_format_xlate *);
  79         void (*put_formats)(struct soc_camera_device *);
  80         int (*cropcap)(struct soc_camera_device *, struct v4l2_cropcap *);
  81         int (*get_crop)(struct soc_camera_device *, struct v4l2_crop *);
  82         int (*set_crop)(struct soc_camera_device *, struct v4l2_crop *);
  83         int (*set_fmt)(struct soc_camera_device *, struct v4l2_format *);
  84         int (*try_fmt)(struct soc_camera_device *, struct v4l2_format *);
  85         void (*init_videobuf)(struct videobuf_queue *,
  86                               struct soc_camera_device *);
  87         int (*init_videobuf2)(struct vb2_queue *,
  88                               struct soc_camera_device *);
  89         int (*reqbufs)(struct soc_camera_device *, struct v4l2_requestbuffers *);
  90         int (*querycap)(struct soc_camera_host *, struct v4l2_capability *);
  91         int (*set_bus_param)(struct soc_camera_device *, __u32);
  92         int (*get_ctrl)(struct soc_camera_device *, struct v4l2_control *);
  93         int (*set_ctrl)(struct soc_camera_device *, struct v4l2_control *);
  94         int (*get_parm)(struct soc_camera_device *, struct v4l2_streamparm *);
  95         int (*set_parm)(struct soc_camera_device *, struct v4l2_streamparm *);
  96         int (*enum_fsizes)(struct soc_camera_device *, struct v4l2_frmsizeenum *);
  97         unsigned int (*poll)(struct file *, poll_table *);
  98         const struct v4l2_queryctrl *controls;
  99         int num_controls;
 100 };
 101
 102 #define SOCAM_SENSOR_INVERT_PCLK        (1 << 0)
 103 #define SOCAM_SENSOR_INVERT_MCLK        (1 << 1)
 104 #define SOCAM_SENSOR_INVERT_HSYNC       (1 << 2)
 105 #define SOCAM_SENSOR_INVERT_VSYNC       (1 << 3)
 106 #define SOCAM_SENSOR_INVERT_DATA        (1 << 4)
 107
 108 struct i2c_board_info;
 109 struct regulator_bulk_data;
 110
 111 struct soc_camera_link {
 112         /* Camera bus id, used to match a camera and a bus */
 113         int bus_id;
 114         /* Per camera SOCAM_SENSOR_* bus flags */
 115         unsigned long flags;
 116         int i2c_adapter_id;
 117         struct i2c_board_info *board_info;
 118         const char *module_name;
 119         void *priv;
 120
 121         /* Optional regulators that have to be managed on power on/off events */
 122         struct regulator_bulk_data *regulators;
 123         int num_regulators;
 124
 125         /*
 126          * For non-I2C devices platform platform has to provide methods to
 127          * add a device to the system and to remove
 128          */
 129         int (*add_device)(struct soc_camera_link *, struct device *);
 130         void (*del_device)(struct soc_camera_link *);
 131         /* Optional callbacks to power on or off and reset the sensor */
 132         int (*power)(struct device *, int);
 133         int (*reset)(struct device *);
 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_link *, unsigned long flags);
 140         unsigned long (*query_bus_param)(struct soc_camera_link *);
 141         void (*free_bus)(struct soc_camera_link *);
 142 };
 143
 144 static inline struct soc_camera_device *to_soc_camera_dev(
 145         const struct device *dev)
 146 {
 147         return container_of(dev, struct soc_camera_device, dev);
 148 }
 149
 150 static inline struct soc_camera_host *to_soc_camera_host(
 151         const struct device *dev)
 152 {
 153         struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
 154
 155         return container_of(v4l2_dev, struct soc_camera_host, v4l2_dev);
 156 }
 157
 158 static inline struct soc_camera_link *to_soc_camera_link(
 159         const struct soc_camera_device *icd)
 160 {
 161         return icd->dev.platform_data;
 162 }
 163
 164 static inline struct device *to_soc_camera_control(
 165         const struct soc_camera_device *icd)
 166 {
 167         return dev_get_drvdata(&icd->dev);
 168 }
 169
 170 static inline struct v4l2_subdev *soc_camera_to_subdev(
 171         const struct soc_camera_device *icd)
 172 {
 173         struct device *control = to_soc_camera_control(icd);
 174         return dev_get_drvdata(control);
 175 }
 176
 177 int soc_camera_host_register(struct soc_camera_host *ici);
 178 void soc_camera_host_unregister(struct soc_camera_host *ici);
 179
 180 const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
 181         struct soc_camera_device *icd, unsigned int fourcc);
 182
 183 /**
 184  * struct soc_camera_format_xlate - match between host and sensor formats
 185  * @code: code of a sensor provided format
 186  * @host_fmt: host format after host translation from code
 187  *
 188  * Host and sensor translation structure. Used in table of host and sensor
 189  * formats matchings in soc_camera_device. A host can override the generic list
 190  * generation by implementing get_formats(), and use it for format checks and
 191  * format setup.
 192  */
 193 struct soc_camera_format_xlate {
 194         enum v4l2_mbus_pixelcode code;
 195         const struct soc_mbus_pixelfmt *host_fmt;
 196 };
 197
 198 struct soc_camera_ops {
 199         int (*suspend)(struct soc_camera_device *, pm_message_t state);
 200         int (*resume)(struct soc_camera_device *);
 201         unsigned long (*query_bus_param)(struct soc_camera_device *);
 202         int (*set_bus_param)(struct soc_camera_device *, unsigned long);
 203         int (*enum_input)(struct soc_camera_device *, struct v4l2_input *);
 204         const struct v4l2_queryctrl *controls;
 205         int num_controls;
 206 };
 207
 208 #define SOCAM_SENSE_PCLK_CHANGED        (1 << 0)
 209
 210 /**
 211  * This struct can be attached to struct soc_camera_device by the host driver
 212  * to request sense from the camera, for example, when calling .set_fmt(). The
 213  * host then can check which flags are set and verify respective values if any.
 214  * For example, if SOCAM_SENSE_PCLK_CHANGED is set, it means, pixclock has
 215  * changed during this operation. After completion the host should detach sense.
 216  *
 217  * @flags               ored SOCAM_SENSE_* flags
 218  * @master_clock        if the host wants to be informed about pixel-clock
 219  *                      change, it better set master_clock.
 220  * @pixel_clock_max     maximum pixel clock frequency supported by the host,
 221  *                      camera is not allowed to exceed this.
 222  * @pixel_clock         if the camera driver changed pixel clock during this
 223  *                      operation, it sets SOCAM_SENSE_PCLK_CHANGED, uses
 224  *                      master_clock to calculate the new pixel-clock and
 225  *                      sets this field.
 226  */
 227 struct soc_camera_sense {
 228         unsigned long flags;
 229         unsigned long master_clock;
 230         unsigned long pixel_clock_max;
 231         unsigned long pixel_clock;
 232 };
 233
 234 static inline struct v4l2_queryctrl const *soc_camera_find_qctrl(
 235         struct soc_camera_ops *ops, int id)
 236 {
 237         int i;
 238
 239         for (i = 0; i < ops->num_controls; i++)
 240                 if (ops->controls[i].id == id)
 241                         return &ops->controls[i];
 242
 243         return NULL;
 244 }
 245
 246 #define SOCAM_MASTER                    (1 << 0)
 247 #define SOCAM_SLAVE                     (1 << 1)
 248 #define SOCAM_HSYNC_ACTIVE_HIGH         (1 << 2)
 249 #define SOCAM_HSYNC_ACTIVE_LOW          (1 << 3)
 250 #define SOCAM_VSYNC_ACTIVE_HIGH         (1 << 4)
 251 #define SOCAM_VSYNC_ACTIVE_LOW          (1 << 5)
 252 #define SOCAM_DATAWIDTH_4               (1 << 6)
 253 #define SOCAM_DATAWIDTH_8               (1 << 7)
 254 #define SOCAM_DATAWIDTH_9               (1 << 8)
 255 #define SOCAM_DATAWIDTH_10              (1 << 9)
 256 #define SOCAM_DATAWIDTH_15              (1 << 10)
 257 #define SOCAM_DATAWIDTH_16              (1 << 11)
 258 #define SOCAM_PCLK_SAMPLE_RISING        (1 << 12)
 259 #define SOCAM_PCLK_SAMPLE_FALLING       (1 << 13)
 260 #define SOCAM_DATA_ACTIVE_HIGH          (1 << 14)
 261 #define SOCAM_DATA_ACTIVE_LOW           (1 << 15)
 262
 263 #define SOCAM_DATAWIDTH_MASK (SOCAM_DATAWIDTH_4 | SOCAM_DATAWIDTH_8 | \
 264                               SOCAM_DATAWIDTH_9 | SOCAM_DATAWIDTH_10 | \
 265                               SOCAM_DATAWIDTH_15 | SOCAM_DATAWIDTH_16)
 266
 267 static inline unsigned long soc_camera_bus_param_compatible(
 268                         unsigned long camera_flags, unsigned long bus_flags)
 269 {
 270         unsigned long common_flags, hsync, vsync, pclk, data, buswidth, mode;
 271
 272         common_flags = camera_flags & bus_flags;
 273
 274         hsync = common_flags & (SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW);
 275         vsync = common_flags & (SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW);
 276         pclk = common_flags & (SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING);
 277         data = common_flags & (SOCAM_DATA_ACTIVE_HIGH | SOCAM_DATA_ACTIVE_LOW);
 278         mode = common_flags & (SOCAM_MASTER | SOCAM_SLAVE);
 279         buswidth = common_flags & SOCAM_DATAWIDTH_MASK;
 280
 281         return (!hsync || !vsync || !pclk || !data || !mode || !buswidth) ? 0 :
 282                 common_flags;
 283 }
 284
 285 static inline void soc_camera_limit_side(int *start, int *length,
 286                 unsigned int start_min,
 287                 unsigned int length_min, unsigned int length_max)
 288 {
 289         if (*length < length_min)
 290                 *length = length_min;
 291         else if (*length > length_max)
 292                 *length = length_max;
 293
 294         if (*start < start_min)
 295                 *start = start_min;
 296         else if (*start > start_min + length_max - *length)
 297                 *start = start_min + length_max - *length;
 298 }
 299
 300 extern unsigned long soc_camera_apply_sensor_flags(struct soc_camera_link *icl,
 301                                                    unsigned long flags);
 302
 303 /* This is only temporary here - until v4l2-subdev begins to link to video_device */
 304 #include <linux/i2c.h>
 305 static inline struct video_device *soc_camera_i2c_to_vdev(struct i2c_client *client)
 306 {
 307         struct soc_camera_device *icd = client->dev.platform_data;
 308         return icd->vdev;
 309 }
 310
 311 static inline struct soc_camera_device *soc_camera_from_vb2q(struct vb2_queue *vq)
 312 {
 313         return container_of(vq, struct soc_camera_device, vb2_vidq);
 314 }
 315
 316 static inline struct soc_camera_device *soc_camera_from_vbq(struct videobuf_queue *vq)
 317 {
 318         return container_of(vq, struct soc_camera_device, vb_vidq);
 319 }
 320
 321 void soc_camera_lock(struct vb2_queue *vq);
 322 void soc_camera_unlock(struct vb2_queue *vq);
 323
 324 #endif