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/v4l2-device.h>
  21
  22 extern struct bus_type soc_camera_bus_type;
  23
  24 struct file;
  25
  26 struct soc_camera_device {
  27         struct list_head list;
  28         struct device dev;
  29         struct device *pdev;            /* Platform device */
  30         s32 user_width;
  31         s32 user_height;
  32         enum v4l2_colorspace colorspace;
  33         unsigned char iface;            /* Host number */
  34         unsigned char devnum;           /* Device number per host */
  35         struct soc_camera_sense *sense; /* See comment in struct definition */
  36         struct soc_camera_ops *ops;
  37         struct video_device *vdev;
  38         const struct soc_camera_format_xlate *current_fmt;
  39         struct soc_camera_format_xlate *user_formats;
  40         int num_user_formats;
  41         enum v4l2_field field;          /* Preserve field over close() */
  42         void *host_priv;                /* Per-device host private data */
  43         /* soc_camera.c private count. Only accessed with .video_lock held */
  44         int use_count;
  45         struct mutex video_lock;        /* Protects device data */
  46         struct file *streamer;          /* stream owner */
  47         struct videobuf_queue vb_vidq;
  48 };
  49
  50 struct soc_camera_host {
  51         struct v4l2_device v4l2_dev;
  52         struct list_head list;
  53         unsigned char nr;                               /* Host number */
  54         void *priv;
  55         const char *drv_name;
  56         struct soc_camera_host_ops *ops;
  57 };
  58
  59 struct soc_camera_host_ops {
  60         struct module *owner;
  61         int (*add)(struct soc_camera_device *);
  62         void (*remove)(struct soc_camera_device *);
  63         int (*suspend)(struct soc_camera_device *, pm_message_t);
  64         int (*resume)(struct soc_camera_device *);
  65         /*
  66          * .get_formats() is called for each client device format, but
  67          * .put_formats() is only called once. Further, if any of the calls to
  68          * .get_formats() fail, .put_formats() will not be called at all, the
  69          * failing .get_formats() must then clean up internally.
  70          */
  71         int (*get_formats)(struct soc_camera_device *, unsigned int,
  72                            struct soc_camera_format_xlate *);
  73         void (*put_formats)(struct soc_camera_device *);
  74         int (*cropcap)(struct soc_camera_device *, struct v4l2_cropcap *);
  75         int (*get_crop)(struct soc_camera_device *, struct v4l2_crop *);
  76         int (*set_crop)(struct soc_camera_device *, struct v4l2_crop *);
  77         int (*set_fmt)(struct soc_camera_device *, struct v4l2_format *);
  78         int (*try_fmt)(struct soc_camera_device *, struct v4l2_format *);
  79         void (*init_videobuf)(struct videobuf_queue *,
  80                               struct soc_camera_device *);
  81         int (*reqbufs)(struct soc_camera_device *, struct v4l2_requestbuffers *);
  82         int (*querycap)(struct soc_camera_host *, struct v4l2_capability *);
  83         int (*set_bus_param)(struct soc_camera_device *, __u32);
  84         int (*get_ctrl)(struct soc_camera_device *, struct v4l2_control *);
  85         int (*set_ctrl)(struct soc_camera_device *, struct v4l2_control *);
  86         int (*get_parm)(struct soc_camera_device *, struct v4l2_streamparm *);
  87         int (*set_parm)(struct soc_camera_device *, struct v4l2_streamparm *);
  88         unsigned int (*poll)(struct file *, poll_table *);
  89         const struct v4l2_queryctrl *controls;
  90         int num_controls;
  91 };
  92
  93 #define SOCAM_SENSOR_INVERT_PCLK        (1 << 0)
  94 #define SOCAM_SENSOR_INVERT_MCLK        (1 << 1)
  95 #define SOCAM_SENSOR_INVERT_HSYNC       (1 << 2)
  96 #define SOCAM_SENSOR_INVERT_VSYNC       (1 << 3)
  97 #define SOCAM_SENSOR_INVERT_DATA        (1 << 4)
  98
  99 struct i2c_board_info;
 100
 101 struct soc_camera_link {
 102         /* Camera bus id, used to match a camera and a bus */
 103         int bus_id;
 104         /* Per camera SOCAM_SENSOR_* bus flags */
 105         unsigned long flags;
 106         int i2c_adapter_id;
 107         struct i2c_board_info *board_info;
 108         const char *module_name;
 109         void *priv;
 110
 111         /*
 112          * For non-I2C devices platform platform has to provide methods to
 113          * add a device to the system and to remove
 114          */
 115         int (*add_device)(struct soc_camera_link *, struct device *);
 116         void (*del_device)(struct soc_camera_link *);
 117         /* Optional callbacks to power on or off and reset the sensor */
 118         int (*power)(struct device *, int);
 119         int (*reset)(struct device *);
 120         /*
 121          * some platforms may support different data widths than the sensors
 122          * native ones due to different data line routing. Let the board code
 123          * overwrite the width flags.
 124          */
 125         int (*set_bus_param)(struct soc_camera_link *, unsigned long flags);
 126         unsigned long (*query_bus_param)(struct soc_camera_link *);
 127         void (*free_bus)(struct soc_camera_link *);
 128 };
 129
 130 static inline struct soc_camera_device *to_soc_camera_dev(
 131         const struct device *dev)
 132 {
 133         return container_of(dev, struct soc_camera_device, dev);
 134 }
 135
 136 static inline struct soc_camera_host *to_soc_camera_host(
 137         const struct device *dev)
 138 {
 139         struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
 140
 141         return container_of(v4l2_dev, struct soc_camera_host, v4l2_dev);
 142 }
 143
 144 static inline struct soc_camera_link *to_soc_camera_link(
 145         const struct soc_camera_device *icd)
 146 {
 147         return icd->dev.platform_data;
 148 }
 149
 150 static inline struct device *to_soc_camera_control(
 151         const struct soc_camera_device *icd)
 152 {
 153         return dev_get_drvdata(&icd->dev);
 154 }
 155
 156 static inline struct v4l2_subdev *soc_camera_to_subdev(
 157         const struct soc_camera_device *icd)
 158 {
 159         struct device *control = to_soc_camera_control(icd);
 160         return dev_get_drvdata(control);
 161 }
 162
 163 int soc_camera_host_register(struct soc_camera_host *ici);
 164 void soc_camera_host_unregister(struct soc_camera_host *ici);
 165
 166 const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
 167         struct soc_camera_device *icd, unsigned int fourcc);
 168
 169 /**
 170  * struct soc_camera_format_xlate - match between host and sensor formats
 171  * @code: code of a sensor provided format
 172  * @host_fmt: host format after host translation from code
 173  *
 174  * Host and sensor translation structure. Used in table of host and sensor
 175  * formats matchings in soc_camera_device. A host can override the generic list
 176  * generation by implementing get_formats(), and use it for format checks and
 177  * format setup.
 178  */
 179 struct soc_camera_format_xlate {
 180         enum v4l2_mbus_pixelcode code;
 181         const struct soc_mbus_pixelfmt *host_fmt;
 182 };
 183
 184 struct soc_camera_ops {
 185         int (*suspend)(struct soc_camera_device *, pm_message_t state);
 186         int (*resume)(struct soc_camera_device *);
 187         unsigned long (*query_bus_param)(struct soc_camera_device *);
 188         int (*set_bus_param)(struct soc_camera_device *, unsigned long);
 189         int (*enum_input)(struct soc_camera_device *, struct v4l2_input *);
 190         const struct v4l2_queryctrl *controls;
 191         int num_controls;
 192 };
 193
 194 #define SOCAM_SENSE_PCLK_CHANGED        (1 << 0)
 195
 196 /**
 197  * This struct can be attached to struct soc_camera_device by the host driver
 198  * to request sense from the camera, for example, when calling .set_fmt(). The
 199  * host then can check which flags are set and verify respective values if any.
 200  * For example, if SOCAM_SENSE_PCLK_CHANGED is set, it means, pixclock has
 201  * changed during this operation. After completion the host should detach sense.
 202  *
 203  * @flags               ored SOCAM_SENSE_* flags
 204  * @master_clock        if the host wants to be informed about pixel-clock
 205  *                      change, it better set master_clock.
 206  * @pixel_clock_max     maximum pixel clock frequency supported by the host,
 207  *                      camera is not allowed to exceed this.
 208  * @pixel_clock         if the camera driver changed pixel clock during this
 209  *                      operation, it sets SOCAM_SENSE_PCLK_CHANGED, uses
 210  *                      master_clock to calculate the new pixel-clock and
 211  *                      sets this field.
 212  */
 213 struct soc_camera_sense {
 214         unsigned long flags;
 215         unsigned long master_clock;
 216         unsigned long pixel_clock_max;
 217         unsigned long pixel_clock;
 218 };
 219
 220 static inline struct v4l2_queryctrl const *soc_camera_find_qctrl(
 221         struct soc_camera_ops *ops, int id)
 222 {
 223         int i;
 224
 225         for (i = 0; i < ops->num_controls; i++)
 226                 if (ops->controls[i].id == id)
 227                         return &ops->controls[i];
 228
 229         return NULL;
 230 }
 231
 232 #define SOCAM_MASTER                    (1 << 0)
 233 #define SOCAM_SLAVE                     (1 << 1)
 234 #define SOCAM_HSYNC_ACTIVE_HIGH         (1 << 2)
 235 #define SOCAM_HSYNC_ACTIVE_LOW          (1 << 3)
 236 #define SOCAM_VSYNC_ACTIVE_HIGH         (1 << 4)
 237 #define SOCAM_VSYNC_ACTIVE_LOW          (1 << 5)
 238 #define SOCAM_DATAWIDTH_4               (1 << 6)
 239 #define SOCAM_DATAWIDTH_8               (1 << 7)
 240 #define SOCAM_DATAWIDTH_9               (1 << 8)
 241 #define SOCAM_DATAWIDTH_10              (1 << 9)
 242 #define SOCAM_DATAWIDTH_15              (1 << 10)
 243 #define SOCAM_DATAWIDTH_16              (1 << 11)
 244 #define SOCAM_PCLK_SAMPLE_RISING        (1 << 12)
 245 #define SOCAM_PCLK_SAMPLE_FALLING       (1 << 13)
 246 #define SOCAM_DATA_ACTIVE_HIGH          (1 << 14)
 247 #define SOCAM_DATA_ACTIVE_LOW           (1 << 15)
 248
 249 #define SOCAM_DATAWIDTH_MASK (SOCAM_DATAWIDTH_4 | SOCAM_DATAWIDTH_8 | \
 250                               SOCAM_DATAWIDTH_9 | SOCAM_DATAWIDTH_10 | \
 251                               SOCAM_DATAWIDTH_15 | SOCAM_DATAWIDTH_16)
 252
 253 static inline unsigned long soc_camera_bus_param_compatible(
 254                         unsigned long camera_flags, unsigned long bus_flags)
 255 {
 256         unsigned long common_flags, hsync, vsync, pclk, data, buswidth, mode;
 257
 258         common_flags = camera_flags & bus_flags;
 259
 260         hsync = common_flags & (SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW);
 261         vsync = common_flags & (SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW);
 262         pclk = common_flags & (SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING);
 263         data = common_flags & (SOCAM_DATA_ACTIVE_HIGH | SOCAM_DATA_ACTIVE_LOW);
 264         mode = common_flags & (SOCAM_MASTER | SOCAM_SLAVE);
 265         buswidth = common_flags & SOCAM_DATAWIDTH_MASK;
 266
 267         return (!hsync || !vsync || !pclk || !data || !mode || !buswidth) ? 0 :
 268                 common_flags;
 269 }
 270
 271 static inline void soc_camera_limit_side(int *start, int *length,
 272                 unsigned int start_min,
 273                 unsigned int length_min, unsigned int length_max)
 274 {
 275         if (*length < length_min)
 276                 *length = length_min;
 277         else if (*length > length_max)
 278                 *length = length_max;
 279
 280         if (*start < start_min)
 281                 *start = start_min;
 282         else if (*start > start_min + length_max - *length)
 283                 *start = start_min + length_max - *length;
 284 }
 285
 286 extern unsigned long soc_camera_apply_sensor_flags(struct soc_camera_link *icl,
 287                                                    unsigned long flags);
 288
 289 /* This is only temporary here - until v4l2-subdev begins to link to video_device */
 290 #include <linux/i2c.h>
 291 static inline struct video_device *soc_camera_i2c_to_vdev(struct i2c_client *client)
 292 {
 293         struct soc_camera_device *icd = client->dev.platform_data;
 294         return icd->vdev;
 295 }
 296
 297 #endif