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 #include <media/v4l2-device.h>
  20
  21 struct soc_camera_device {
  22         struct list_head list;
  23         struct device dev;
  24         struct device *pdev;            /* Platform device */
  25         s32 user_width;
  26         s32 user_height;
  27         enum v4l2_colorspace colorspace;
  28         unsigned char iface;            /* Host number */
  29         unsigned char devnum;           /* Device number per host */
  30         struct soc_camera_sense *sense; /* See comment in struct definition */
  31         struct soc_camera_ops *ops;
  32         struct video_device *vdev;
  33         const struct soc_camera_format_xlate *current_fmt;
  34         struct soc_camera_format_xlate *user_formats;
  35         int num_user_formats;
  36         enum v4l2_field field;          /* Preserve field over close() */
  37         void *host_priv;                /* Per-device host private data */
  38         /* soc_camera.c private count. Only accessed with .video_lock held */
  39         int use_count;
  40         struct mutex video_lock;        /* Protects device data */
  41 };
  42
  43 struct soc_camera_file {
  44         struct soc_camera_device *icd;
  45         struct videobuf_queue vb_vidq;
  46 };
  47
  48 struct soc_camera_host {
  49         struct v4l2_device v4l2_dev;
  50         struct list_head list;
  51         unsigned char nr;                               /* Host number */
  52         void *priv;
  53         const char *drv_name;
  54         struct soc_camera_host_ops *ops;
  55 };
  56
  57 struct soc_camera_host_ops {
  58         struct module *owner;
  59         int (*add)(struct soc_camera_device *);
  60         void (*remove)(struct soc_camera_device *);
  61         int (*suspend)(struct soc_camera_device *, pm_message_t);
  62         int (*resume)(struct soc_camera_device *);
  63         /*
  64          * .get_formats() is called for each client device format, but
  65          * .put_formats() is only called once. Further, if any of the calls to
  66          * .get_formats() fail, .put_formats() will not be called at all, the
  67          * failing .get_formats() must then clean up internally.
  68          */
  69         int (*get_formats)(struct soc_camera_device *, int,
  70                            struct soc_camera_format_xlate *);
  71         void (*put_formats)(struct soc_camera_device *);
  72         int (*cropcap)(struct soc_camera_device *, struct v4l2_cropcap *);
  73         int (*get_crop)(struct soc_camera_device *, struct v4l2_crop *);
  74         int (*set_crop)(struct soc_camera_device *, struct v4l2_crop *);
  75         int (*set_fmt)(struct soc_camera_device *, struct v4l2_format *);
  76         int (*try_fmt)(struct soc_camera_device *, struct v4l2_format *);
  77         void (*init_videobuf)(struct videobuf_queue *,
  78                               struct soc_camera_device *);
  79         int (*reqbufs)(struct soc_camera_file *, struct v4l2_requestbuffers *);
  80         int (*querycap)(struct soc_camera_host *, struct v4l2_capability *);
  81         int (*set_bus_param)(struct soc_camera_device *, __u32);
  82         int (*get_ctrl)(struct soc_camera_device *, struct v4l2_control *);
  83         int (*set_ctrl)(struct soc_camera_device *, struct v4l2_control *);
  84         int (*get_parm)(struct soc_camera_device *, struct v4l2_streamparm *);
  85         int (*set_parm)(struct soc_camera_device *, struct v4l2_streamparm *);
  86         unsigned int (*poll)(struct file *, poll_table *);
  87         const struct v4l2_queryctrl *controls;
  88         int num_controls;
  89 };
  90
  91 #define SOCAM_SENSOR_INVERT_PCLK        (1 << 0)
  92 #define SOCAM_SENSOR_INVERT_MCLK        (1 << 1)
  93 #define SOCAM_SENSOR_INVERT_HSYNC       (1 << 2)
  94 #define SOCAM_SENSOR_INVERT_VSYNC       (1 << 3)
  95 #define SOCAM_SENSOR_INVERT_DATA        (1 << 4)
  96
  97 struct i2c_board_info;
  98
  99 struct soc_camera_link {
 100         /* Camera bus id, used to match a camera and a bus */
 101         int bus_id;
 102         /* Per camera SOCAM_SENSOR_* bus flags */
 103         unsigned long flags;
 104         int i2c_adapter_id;
 105         struct i2c_board_info *board_info;
 106         const char *module_name;
 107         void *priv;
 108
 109         /*
 110          * For non-I2C devices platform platform has to provide methods to
 111          * add a device to the system and to remove
 112          */
 113         int (*add_device)(struct soc_camera_link *, struct device *);
 114         void (*del_device)(struct soc_camera_link *);
 115         /* Optional callbacks to power on or off and reset the sensor */
 116         int (*power)(struct device *, int);
 117         int (*reset)(struct device *);
 118         /*
 119          * some platforms may support different data widths than the sensors
 120          * native ones due to different data line routing. Let the board code
 121          * overwrite the width flags.
 122          */
 123         int (*set_bus_param)(struct soc_camera_link *, unsigned long flags);
 124         unsigned long (*query_bus_param)(struct soc_camera_link *);
 125         void (*free_bus)(struct soc_camera_link *);
 126 };
 127
 128 static inline struct soc_camera_device *to_soc_camera_dev(
 129         const struct device *dev)
 130 {
 131         return container_of(dev, struct soc_camera_device, dev);
 132 }
 133
 134 static inline struct soc_camera_host *to_soc_camera_host(
 135         const struct device *dev)
 136 {
 137         struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
 138
 139         return container_of(v4l2_dev, struct soc_camera_host, v4l2_dev);
 140 }
 141
 142 static inline struct soc_camera_link *to_soc_camera_link(
 143         const struct soc_camera_device *icd)
 144 {
 145         return icd->dev.platform_data;
 146 }
 147
 148 static inline struct device *to_soc_camera_control(
 149         const struct soc_camera_device *icd)
 150 {
 151         return dev_get_drvdata(&icd->dev);
 152 }
 153
 154 static inline struct v4l2_subdev *soc_camera_to_subdev(
 155         const struct soc_camera_device *icd)
 156 {
 157         struct device *control = to_soc_camera_control(icd);
 158         return dev_get_drvdata(control);
 159 }
 160
 161 int soc_camera_host_register(struct soc_camera_host *ici);
 162 void soc_camera_host_unregister(struct soc_camera_host *ici);
 163
 164 const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
 165         struct soc_camera_device *icd, unsigned int fourcc);
 166
 167 /**
 168  * struct soc_camera_format_xlate - match between host and sensor formats
 169  * @code: code of a sensor provided format
 170  * @host_fmt: host format after host translation from code
 171  *
 172  * Host and sensor translation structure. Used in table of host and sensor
 173  * formats matchings in soc_camera_device. A host can override the generic list
 174  * generation by implementing get_formats(), and use it for format checks and
 175  * format setup.
 176  */
 177 struct soc_camera_format_xlate {
 178         enum v4l2_mbus_pixelcode code;
 179         const struct soc_mbus_pixelfmt *host_fmt;
 180 };
 181
 182 struct soc_camera_ops {
 183         int (*suspend)(struct soc_camera_device *, pm_message_t state);
 184         int (*resume)(struct soc_camera_device *);
 185         unsigned long (*query_bus_param)(struct soc_camera_device *);
 186         int (*set_bus_param)(struct soc_camera_device *, unsigned long);
 187         int (*enum_input)(struct soc_camera_device *, struct v4l2_input *);
 188         const struct v4l2_queryctrl *controls;
 189         int num_controls;
 190 };
 191
 192 #define SOCAM_SENSE_PCLK_CHANGED        (1 << 0)
 193
 194 /**
 195  * This struct can be attached to struct soc_camera_device by the host driver
 196  * to request sense from the camera, for example, when calling .set_fmt(). The
 197  * host then can check which flags are set and verify respective values if any.
 198  * For example, if SOCAM_SENSE_PCLK_CHANGED is set, it means, pixclock has
 199  * changed during this operation. After completion the host should detach sense.
 200  *
 201  * @flags               ored SOCAM_SENSE_* flags
 202  * @master_clock        if the host wants to be informed about pixel-clock
 203  *                      change, it better set master_clock.
 204  * @pixel_clock_max     maximum pixel clock frequency supported by the host,
 205  *                      camera is not allowed to exceed this.
 206  * @pixel_clock         if the camera driver changed pixel clock during this
 207  *                      operation, it sets SOCAM_SENSE_PCLK_CHANGED, uses
 208  *                      master_clock to calculate the new pixel-clock and
 209  *                      sets this field.
 210  */
 211 struct soc_camera_sense {
 212         unsigned long flags;
 213         unsigned long master_clock;
 214         unsigned long pixel_clock_max;
 215         unsigned long pixel_clock;
 216 };
 217
 218 static inline struct v4l2_queryctrl const *soc_camera_find_qctrl(
 219         struct soc_camera_ops *ops, int id)
 220 {
 221         int i;
 222
 223         for (i = 0; i < ops->num_controls; i++)
 224                 if (ops->controls[i].id == id)
 225                         return &ops->controls[i];
 226
 227         return NULL;
 228 }
 229
 230 #define SOCAM_MASTER                    (1 << 0)
 231 #define SOCAM_SLAVE                     (1 << 1)
 232 #define SOCAM_HSYNC_ACTIVE_HIGH         (1 << 2)
 233 #define SOCAM_HSYNC_ACTIVE_LOW          (1 << 3)
 234 #define SOCAM_VSYNC_ACTIVE_HIGH         (1 << 4)
 235 #define SOCAM_VSYNC_ACTIVE_LOW          (1 << 5)
 236 #define SOCAM_DATAWIDTH_4               (1 << 6)
 237 #define SOCAM_DATAWIDTH_8               (1 << 7)
 238 #define SOCAM_DATAWIDTH_9               (1 << 8)
 239 #define SOCAM_DATAWIDTH_10              (1 << 9)
 240 #define SOCAM_DATAWIDTH_15              (1 << 10)
 241 #define SOCAM_DATAWIDTH_16              (1 << 11)
 242 #define SOCAM_PCLK_SAMPLE_RISING        (1 << 12)
 243 #define SOCAM_PCLK_SAMPLE_FALLING       (1 << 13)
 244 #define SOCAM_DATA_ACTIVE_HIGH          (1 << 14)
 245 #define SOCAM_DATA_ACTIVE_LOW           (1 << 15)
 246
 247 #define SOCAM_DATAWIDTH_MASK (SOCAM_DATAWIDTH_4 | SOCAM_DATAWIDTH_8 | \
 248                               SOCAM_DATAWIDTH_9 | SOCAM_DATAWIDTH_10 | \
 249                               SOCAM_DATAWIDTH_15 | SOCAM_DATAWIDTH_16)
 250
 251 static inline unsigned long soc_camera_bus_param_compatible(
 252                         unsigned long camera_flags, unsigned long bus_flags)
 253 {
 254         unsigned long common_flags, hsync, vsync, pclk, data, buswidth, mode;
 255
 256         common_flags = camera_flags & bus_flags;
 257
 258         hsync = common_flags & (SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW);
 259         vsync = common_flags & (SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW);
 260         pclk = common_flags & (SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING);
 261         data = common_flags & (SOCAM_DATA_ACTIVE_HIGH | SOCAM_DATA_ACTIVE_LOW);
 262         mode = common_flags & (SOCAM_MASTER | SOCAM_SLAVE);
 263         buswidth = common_flags & SOCAM_DATAWIDTH_MASK;
 264
 265         return (!hsync || !vsync || !pclk || !data || !mode || !buswidth) ? 0 :
 266                 common_flags;
 267 }
 268
 269 static inline void soc_camera_limit_side(unsigned int *start,
 270                 unsigned int *length, unsigned int start_min,
 271                 unsigned int length_min, unsigned int length_max)
 272 {
 273         if (*length < length_min)
 274                 *length = length_min;
 275         else if (*length > length_max)
 276                 *length = length_max;
 277
 278         if (*start < start_min)
 279                 *start = start_min;
 280         else if (*start > start_min + length_max - *length)
 281                 *start = start_min + length_max - *length;
 282 }
 283
 284 extern unsigned long soc_camera_apply_sensor_flags(struct soc_camera_link *icl,
 285                                                    unsigned long flags);
 286
 287 #endif