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/mutex.h>
  16 #include <linux/pm.h>
  17 #include <linux/videodev2.h>
  18 #include <media/videobuf-core.h>
  19
  20 struct soc_camera_device {
  21         struct list_head list;
  22         struct device dev;
  23         struct device *control;
  24         unsigned short width;           /* Current window */
  25         unsigned short height;          /* sizes */
  26         unsigned short x_min;           /* Camera capabilities */
  27         unsigned short y_min;
  28         unsigned short x_current;       /* Current window location */
  29         unsigned short y_current;
  30         unsigned short width_min;
  31         unsigned short width_max;
  32         unsigned short height_min;
  33         unsigned short height_max;
  34         unsigned short y_skip_top;      /* Lines to skip at the top */
  35         unsigned short gain;
  36         unsigned short exposure;
  37         unsigned char iface;            /* Host number */
  38         unsigned char devnum;           /* Device number per host */
  39         unsigned char buswidth;         /* See comment in .c */
  40         struct soc_camera_sense *sense; /* See comment in struct definition */
  41         struct soc_camera_ops *ops;
  42         struct video_device *vdev;
  43         const struct soc_camera_data_format *current_fmt;
  44         const struct soc_camera_data_format *formats;
  45         int num_formats;
  46         struct soc_camera_format_xlate *user_formats;
  47         int num_user_formats;
  48         enum v4l2_field field;          /* Preserve field over close() */
  49         struct module *owner;
  50         void *host_priv;                /* Per-device host private data */
  51         /* soc_camera.c private count. Only accessed with .video_lock held */
  52         int use_count;
  53         struct mutex video_lock;        /* Protects device data */
  54 };
  55
  56 struct soc_camera_file {
  57         struct soc_camera_device *icd;
  58         struct videobuf_queue vb_vidq;
  59 };
  60
  61 struct soc_camera_host {
  62         struct list_head list;
  63         struct device *dev;
  64         unsigned char nr;                               /* Host number */
  65         void *priv;
  66         const char *drv_name;
  67         struct soc_camera_host_ops *ops;
  68 };
  69
  70 struct soc_camera_host_ops {
  71         struct module *owner;
  72         int (*add)(struct soc_camera_device *);
  73         void (*remove)(struct soc_camera_device *);
  74         int (*suspend)(struct soc_camera_device *, pm_message_t);
  75         int (*resume)(struct soc_camera_device *);
  76         int (*get_formats)(struct soc_camera_device *, int,
  77                            struct soc_camera_format_xlate *);
  78         int (*set_crop)(struct soc_camera_device *, struct v4l2_rect *);
  79         int (*set_fmt)(struct soc_camera_device *, struct v4l2_format *);
  80         int (*try_fmt)(struct soc_camera_device *, struct v4l2_format *);
  81         void (*init_videobuf)(struct videobuf_queue *,
  82                               struct soc_camera_device *);
  83         int (*reqbufs)(struct soc_camera_file *, struct v4l2_requestbuffers *);
  84         int (*querycap)(struct soc_camera_host *, struct v4l2_capability *);
  85         int (*set_bus_param)(struct soc_camera_device *, __u32);
  86         unsigned int (*poll)(struct file *, poll_table *);
  87 };
  88
  89 #define SOCAM_SENSOR_INVERT_PCLK        (1 << 0)
  90 #define SOCAM_SENSOR_INVERT_MCLK        (1 << 1)
  91 #define SOCAM_SENSOR_INVERT_HSYNC       (1 << 2)
  92 #define SOCAM_SENSOR_INVERT_VSYNC       (1 << 3)
  93 #define SOCAM_SENSOR_INVERT_DATA        (1 << 4)
  94
  95 struct i2c_board_info;
  96
  97 struct soc_camera_link {
  98         /* Camera bus id, used to match a camera and a bus */
  99         int bus_id;
 100         /* Per camera SOCAM_SENSOR_* bus flags */
 101         unsigned long flags;
 102         int i2c_adapter_id;
 103         struct i2c_board_info *board_info;
 104         const char *module_name;
 105         /* Optional callbacks to power on or off and reset the sensor */
 106         int (*power)(struct device *, int);
 107         int (*reset)(struct device *);
 108         /*
 109          * some platforms may support different data widths than the sensors
 110          * native ones due to different data line routing. Let the board code
 111          * overwrite the width flags.
 112          */
 113         int (*set_bus_param)(struct soc_camera_link *, unsigned long flags);
 114         unsigned long (*query_bus_param)(struct soc_camera_link *);
 115         void (*free_bus)(struct soc_camera_link *);
 116 };
 117
 118 static inline struct soc_camera_device *to_soc_camera_dev(struct device *dev)
 119 {
 120         return container_of(dev, struct soc_camera_device, dev);
 121 }
 122
 123 static inline struct soc_camera_host *to_soc_camera_host(struct device *dev)
 124 {
 125         return dev_get_drvdata(dev);
 126 }
 127
 128 extern int soc_camera_host_register(struct soc_camera_host *ici);
 129 extern void soc_camera_host_unregister(struct soc_camera_host *ici);
 130 extern int soc_camera_device_register(struct soc_camera_device *icd);
 131 extern void soc_camera_device_unregister(struct soc_camera_device *icd);
 132
 133 extern int soc_camera_video_start(struct soc_camera_device *icd);
 134 extern void soc_camera_video_stop(struct soc_camera_device *icd);
 135
 136 extern const struct soc_camera_data_format *soc_camera_format_by_fourcc(
 137         struct soc_camera_device *icd, unsigned int fourcc);
 138 extern const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
 139         struct soc_camera_device *icd, unsigned int fourcc);
 140
 141 struct soc_camera_data_format {
 142         const char *name;
 143         unsigned int depth;
 144         __u32 fourcc;
 145         enum v4l2_colorspace colorspace;
 146 };
 147
 148 /**
 149  * struct soc_camera_format_xlate - match between host and sensor formats
 150  * @cam_fmt: sensor format provided by the sensor
 151  * @host_fmt: host format after host translation from cam_fmt
 152  * @buswidth: bus width for this format
 153  *
 154  * Host and sensor translation structure. Used in table of host and sensor
 155  * formats matchings in soc_camera_device. A host can override the generic list
 156  * generation by implementing get_formats(), and use it for format checks and
 157  * format setup.
 158  */
 159 struct soc_camera_format_xlate {
 160         const struct soc_camera_data_format *cam_fmt;
 161         const struct soc_camera_data_format *host_fmt;
 162         unsigned char buswidth;
 163 };
 164
 165 struct soc_camera_ops {
 166         struct module *owner;
 167         int (*probe)(struct soc_camera_device *);
 168         void (*remove)(struct soc_camera_device *);
 169         int (*suspend)(struct soc_camera_device *, pm_message_t state);
 170         int (*resume)(struct soc_camera_device *);
 171         int (*init)(struct soc_camera_device *);
 172         int (*release)(struct soc_camera_device *);
 173         int (*start_capture)(struct soc_camera_device *);
 174         int (*stop_capture)(struct soc_camera_device *);
 175         int (*set_crop)(struct soc_camera_device *, struct v4l2_rect *);
 176         int (*set_fmt)(struct soc_camera_device *, struct v4l2_format *);
 177         int (*try_fmt)(struct soc_camera_device *, struct v4l2_format *);
 178         unsigned long (*query_bus_param)(struct soc_camera_device *);
 179         int (*set_bus_param)(struct soc_camera_device *, unsigned long);
 180         int (*get_chip_id)(struct soc_camera_device *,
 181                            struct v4l2_dbg_chip_ident *);
 182         int (*set_std)(struct soc_camera_device *, v4l2_std_id *);
 183         int (*enum_input)(struct soc_camera_device *, struct v4l2_input *);
 184 #ifdef CONFIG_VIDEO_ADV_DEBUG
 185         int (*get_register)(struct soc_camera_device *, struct v4l2_dbg_register *);
 186         int (*set_register)(struct soc_camera_device *, struct v4l2_dbg_register *);
 187 #endif
 188         int (*get_control)(struct soc_camera_device *, struct v4l2_control *);
 189         int (*set_control)(struct soc_camera_device *, struct v4l2_control *);
 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 extern unsigned long soc_camera_apply_sensor_flags(struct soc_camera_link *icl,
 272                                                    unsigned long flags);
 273
 274 #endif