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         unsigned int (*poll)(struct file *, poll_table *);
  85         const struct v4l2_queryctrl *controls;
  86         int num_controls;
  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         void *priv;
 106
 107         /*
 108          * For non-I2C devices platform platform has to provide methods to
 109          * add a device to the system and to remove
 110          */
 111         int (*add_device)(struct soc_camera_link *, struct device *);
 112         void (*del_device)(struct soc_camera_link *);
 113         /* Optional callbacks to power on or off and reset the sensor */
 114         int (*power)(struct device *, int);
 115         int (*reset)(struct device *);
 116         /*
 117          * some platforms may support different data widths than the sensors
 118          * native ones due to different data line routing. Let the board code
 119          * overwrite the width flags.
 120          */
 121         int (*set_bus_param)(struct soc_camera_link *, unsigned long flags);
 122         unsigned long (*query_bus_param)(struct soc_camera_link *);
 123         void (*free_bus)(struct soc_camera_link *);
 124 };
 125
 126 static inline struct soc_camera_device *to_soc_camera_dev(
 127         const struct device *dev)
 128 {
 129         return container_of(dev, struct soc_camera_device, dev);
 130 }
 131
 132 static inline struct soc_camera_host *to_soc_camera_host(
 133         const struct device *dev)
 134 {
 135         struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
 136
 137         return container_of(v4l2_dev, struct soc_camera_host, v4l2_dev);
 138 }
 139
 140 static inline struct soc_camera_link *to_soc_camera_link(
 141         const struct soc_camera_device *icd)
 142 {
 143         return icd->dev.platform_data;
 144 }
 145
 146 static inline struct device *to_soc_camera_control(
 147         const struct soc_camera_device *icd)
 148 {
 149         return dev_get_drvdata(&icd->dev);
 150 }
 151
 152 static inline struct v4l2_subdev *soc_camera_to_subdev(
 153         const struct soc_camera_device *icd)
 154 {
 155         struct device *control = to_soc_camera_control(icd);
 156         return dev_get_drvdata(control);
 157 }
 158
 159 int soc_camera_host_register(struct soc_camera_host *ici);
 160 void soc_camera_host_unregister(struct soc_camera_host *ici);
 161
 162 const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
 163         struct soc_camera_device *icd, unsigned int fourcc);
 164
 165 /**
 166  * struct soc_camera_format_xlate - match between host and sensor formats
 167  * @code: code of a sensor provided format
 168  * @host_fmt: host format after host translation from code
 169  *
 170  * Host and sensor translation structure. Used in table of host and sensor
 171  * formats matchings in soc_camera_device. A host can override the generic list
 172  * generation by implementing get_formats(), and use it for format checks and
 173  * format setup.
 174  */
 175 struct soc_camera_format_xlate {
 176         enum v4l2_mbus_pixelcode code;
 177         const struct soc_mbus_pixelfmt *host_fmt;
 178 };
 179
 180 struct soc_camera_ops {
 181         int (*suspend)(struct soc_camera_device *, pm_message_t state);
 182         int (*resume)(struct soc_camera_device *);
 183         unsigned long (*query_bus_param)(struct soc_camera_device *);
 184         int (*set_bus_param)(struct soc_camera_device *, unsigned long);
 185         int (*enum_input)(struct soc_camera_device *, struct v4l2_input *);
 186         const struct v4l2_queryctrl *controls;
 187         int num_controls;
 188 };
 189
 190 #define SOCAM_SENSE_PCLK_CHANGED        (1 << 0)
 191
 192 /**
 193  * This struct can be attached to struct soc_camera_device by the host driver
 194  * to request sense from the camera, for example, when calling .set_fmt(). The
 195  * host then can check which flags are set and verify respective values if any.
 196  * For example, if SOCAM_SENSE_PCLK_CHANGED is set, it means, pixclock has
 197  * changed during this operation. After completion the host should detach sense.
 198  *
 199  * @flags               ored SOCAM_SENSE_* flags
 200  * @master_clock        if the host wants to be informed about pixel-clock
 201  *                      change, it better set master_clock.
 202  * @pixel_clock_max     maximum pixel clock frequency supported by the host,
 203  *                      camera is not allowed to exceed this.
 204  * @pixel_clock         if the camera driver changed pixel clock during this
 205  *                      operation, it sets SOCAM_SENSE_PCLK_CHANGED, uses
 206  *                      master_clock to calculate the new pixel-clock and
 207  *                      sets this field.
 208  */
 209 struct soc_camera_sense {
 210         unsigned long flags;
 211         unsigned long master_clock;
 212         unsigned long pixel_clock_max;
 213         unsigned long pixel_clock;
 214 };
 215
 216 static inline struct v4l2_queryctrl const *soc_camera_find_qctrl(
 217         struct soc_camera_ops *ops, int id)
 218 {
 219         int i;
 220
 221         for (i = 0; i < ops->num_controls; i++)
 222                 if (ops->controls[i].id == id)
 223                         return &ops->controls[i];
 224
 225         return NULL;
 226 }
 227
 228 #define SOCAM_MASTER                    (1 << 0)
 229 #define SOCAM_SLAVE                     (1 << 1)
 230 #define SOCAM_HSYNC_ACTIVE_HIGH         (1 << 2)
 231 #define SOCAM_HSYNC_ACTIVE_LOW          (1 << 3)
 232 #define SOCAM_VSYNC_ACTIVE_HIGH         (1 << 4)
 233 #define SOCAM_VSYNC_ACTIVE_LOW          (1 << 5)
 234 #define SOCAM_DATAWIDTH_4               (1 << 6)
 235 #define SOCAM_DATAWIDTH_8               (1 << 7)
 236 #define SOCAM_DATAWIDTH_9               (1 << 8)
 237 #define SOCAM_DATAWIDTH_10              (1 << 9)
 238 #define SOCAM_DATAWIDTH_15              (1 << 10)
 239 #define SOCAM_DATAWIDTH_16              (1 << 11)
 240 #define SOCAM_PCLK_SAMPLE_RISING        (1 << 12)
 241 #define SOCAM_PCLK_SAMPLE_FALLING       (1 << 13)
 242 #define SOCAM_DATA_ACTIVE_HIGH          (1 << 14)
 243 #define SOCAM_DATA_ACTIVE_LOW           (1 << 15)
 244
 245 #define SOCAM_DATAWIDTH_MASK (SOCAM_DATAWIDTH_4 | SOCAM_DATAWIDTH_8 | \
 246                               SOCAM_DATAWIDTH_9 | SOCAM_DATAWIDTH_10 | \
 247                               SOCAM_DATAWIDTH_15 | SOCAM_DATAWIDTH_16)
 248
 249 static inline unsigned long soc_camera_bus_param_compatible(
 250                         unsigned long camera_flags, unsigned long bus_flags)
 251 {
 252         unsigned long common_flags, hsync, vsync, pclk, data, buswidth, mode;
 253
 254         common_flags = camera_flags & bus_flags;
 255
 256         hsync = common_flags & (SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW);
 257         vsync = common_flags & (SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW);
 258         pclk = common_flags & (SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING);
 259         data = common_flags & (SOCAM_DATA_ACTIVE_HIGH | SOCAM_DATA_ACTIVE_LOW);
 260         mode = common_flags & (SOCAM_MASTER | SOCAM_SLAVE);
 261         buswidth = common_flags & SOCAM_DATAWIDTH_MASK;
 262
 263         return (!hsync || !vsync || !pclk || !data || !mode || !buswidth) ? 0 :
 264                 common_flags;
 265 }
 266
 267 static inline void soc_camera_limit_side(unsigned int *start,
 268                 unsigned int *length, unsigned int start_min,
 269                 unsigned int length_min, unsigned int length_max)
 270 {
 271         if (*length < length_min)
 272                 *length = length_min;
 273         else if (*length > length_max)
 274                 *length = length_max;
 275
 276         if (*start < start_min)
 277                 *start = start_min;
 278         else if (*start > start_min + length_max - *length)
 279                 *start = start_min + length_max - *length;
 280 }
 281
 282 extern unsigned long soc_camera_apply_sensor_flags(struct soc_camera_link *icl,
 283                                                    unsigned long flags);
 284
 285 #endif