soc_camera.h 9.9 KB

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  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. #ifndef SOC_CAMERA_H
  12. #define SOC_CAMERA_H
  13. #include <linux/mutex.h>
  14. #include <linux/pm.h>
  15. #include <linux/videodev2.h>
  16. #include <media/videobuf-core.h>
  17. #include <media/v4l2-device.h>
  18. struct soc_camera_device {
  19. struct list_head list;
  20. struct device dev;
  21. struct device *pdev; /* Platform device */
  22. s32 user_width;
  23. s32 user_height;
  24. unsigned char iface; /* Host number */
  25. unsigned char devnum; /* Device number per host */
  26. unsigned char buswidth; /* See comment in .c */
  27. struct soc_camera_sense *sense; /* See comment in struct definition */
  28. struct soc_camera_ops *ops;
  29. struct video_device *vdev;
  30. const struct soc_camera_data_format *current_fmt;
  31. const struct soc_camera_data_format *formats;
  32. int num_formats;
  33. struct soc_camera_format_xlate *user_formats;
  34. int num_user_formats;
  35. enum v4l2_field field; /* Preserve field over close() */
  36. void *host_priv; /* Per-device host private data */
  37. /* soc_camera.c private count. Only accessed with .video_lock held */
  38. int use_count;
  39. struct mutex video_lock; /* Protects device data */
  40. };
  41. struct soc_camera_file {
  42. struct soc_camera_device *icd;
  43. struct videobuf_queue vb_vidq;
  44. };
  45. struct soc_camera_host {
  46. struct v4l2_device v4l2_dev;
  47. struct list_head list;
  48. unsigned char nr; /* Host number */
  49. void *priv;
  50. const char *drv_name;
  51. struct soc_camera_host_ops *ops;
  52. };
  53. struct soc_camera_host_ops {
  54. struct module *owner;
  55. int (*add)(struct soc_camera_device *);
  56. void (*remove)(struct soc_camera_device *);
  57. int (*suspend)(struct soc_camera_device *, pm_message_t);
  58. int (*resume)(struct soc_camera_device *);
  59. /*
  60. * .get_formats() is called for each client device format, but
  61. * .put_formats() is only called once. Further, if any of the calls to
  62. * .get_formats() fail, .put_formats() will not be called at all, the
  63. * failing .get_formats() must then clean up internally.
  64. */
  65. int (*get_formats)(struct soc_camera_device *, int,
  66. struct soc_camera_format_xlate *);
  67. void (*put_formats)(struct soc_camera_device *);
  68. int (*cropcap)(struct soc_camera_device *, struct v4l2_cropcap *);
  69. int (*get_crop)(struct soc_camera_device *, struct v4l2_crop *);
  70. int (*set_crop)(struct soc_camera_device *, struct v4l2_crop *);
  71. int (*set_fmt)(struct soc_camera_device *, struct v4l2_format *);
  72. int (*try_fmt)(struct soc_camera_device *, struct v4l2_format *);
  73. void (*init_videobuf)(struct videobuf_queue *,
  74. struct soc_camera_device *);
  75. int (*reqbufs)(struct soc_camera_file *, struct v4l2_requestbuffers *);
  76. int (*querycap)(struct soc_camera_host *, struct v4l2_capability *);
  77. int (*set_bus_param)(struct soc_camera_device *, __u32);
  78. int (*get_ctrl)(struct soc_camera_device *, struct v4l2_control *);
  79. int (*set_ctrl)(struct soc_camera_device *, struct v4l2_control *);
  80. unsigned int (*poll)(struct file *, poll_table *);
  81. const struct v4l2_queryctrl *controls;
  82. int num_controls;
  83. };
  84. #define SOCAM_SENSOR_INVERT_PCLK (1 << 0)
  85. #define SOCAM_SENSOR_INVERT_MCLK (1 << 1)
  86. #define SOCAM_SENSOR_INVERT_HSYNC (1 << 2)
  87. #define SOCAM_SENSOR_INVERT_VSYNC (1 << 3)
  88. #define SOCAM_SENSOR_INVERT_DATA (1 << 4)
  89. struct i2c_board_info;
  90. struct soc_camera_link {
  91. /* Camera bus id, used to match a camera and a bus */
  92. int bus_id;
  93. /* Per camera SOCAM_SENSOR_* bus flags */
  94. unsigned long flags;
  95. int i2c_adapter_id;
  96. struct i2c_board_info *board_info;
  97. const char *module_name;
  98. /*
  99. * For non-I2C devices platform platform has to provide methods to
  100. * add a device to the system and to remove
  101. */
  102. int (*add_device)(struct soc_camera_link *, struct device *);
  103. void (*del_device)(struct soc_camera_link *);
  104. /* Optional callbacks to power on or off and reset the sensor */
  105. int (*power)(struct device *, int);
  106. int (*reset)(struct device *);
  107. /*
  108. * some platforms may support different data widths than the sensors
  109. * native ones due to different data line routing. Let the board code
  110. * overwrite the width flags.
  111. */
  112. int (*set_bus_param)(struct soc_camera_link *, unsigned long flags);
  113. unsigned long (*query_bus_param)(struct soc_camera_link *);
  114. void (*free_bus)(struct soc_camera_link *);
  115. };
  116. static inline struct soc_camera_device *to_soc_camera_dev(
  117. const struct device *dev)
  118. {
  119. return container_of(dev, struct soc_camera_device, dev);
  120. }
  121. static inline struct soc_camera_host *to_soc_camera_host(
  122. const struct device *dev)
  123. {
  124. struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
  125. return container_of(v4l2_dev, struct soc_camera_host, v4l2_dev);
  126. }
  127. static inline struct soc_camera_link *to_soc_camera_link(
  128. const struct soc_camera_device *icd)
  129. {
  130. return icd->dev.platform_data;
  131. }
  132. static inline struct device *to_soc_camera_control(
  133. const struct soc_camera_device *icd)
  134. {
  135. return dev_get_drvdata(&icd->dev);
  136. }
  137. static inline struct v4l2_subdev *soc_camera_to_subdev(
  138. const struct soc_camera_device *icd)
  139. {
  140. struct device *control = to_soc_camera_control(icd);
  141. return dev_get_drvdata(control);
  142. }
  143. int soc_camera_host_register(struct soc_camera_host *ici);
  144. void soc_camera_host_unregister(struct soc_camera_host *ici);
  145. const struct soc_camera_data_format *soc_camera_format_by_fourcc(
  146. struct soc_camera_device *icd, unsigned int fourcc);
  147. const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
  148. struct soc_camera_device *icd, unsigned int fourcc);
  149. struct soc_camera_data_format {
  150. const char *name;
  151. unsigned int depth;
  152. __u32 fourcc;
  153. enum v4l2_colorspace colorspace;
  154. };
  155. /**
  156. * struct soc_camera_format_xlate - match between host and sensor formats
  157. * @cam_fmt: sensor format provided by the sensor
  158. * @host_fmt: host format after host translation from cam_fmt
  159. * @buswidth: bus width for this format
  160. *
  161. * Host and sensor translation structure. Used in table of host and sensor
  162. * formats matchings in soc_camera_device. A host can override the generic list
  163. * generation by implementing get_formats(), and use it for format checks and
  164. * format setup.
  165. */
  166. struct soc_camera_format_xlate {
  167. const struct soc_camera_data_format *cam_fmt;
  168. const struct soc_camera_data_format *host_fmt;
  169. unsigned char buswidth;
  170. };
  171. struct soc_camera_ops {
  172. int (*suspend)(struct soc_camera_device *, pm_message_t state);
  173. int (*resume)(struct soc_camera_device *);
  174. unsigned long (*query_bus_param)(struct soc_camera_device *);
  175. int (*set_bus_param)(struct soc_camera_device *, unsigned long);
  176. int (*enum_input)(struct soc_camera_device *, struct v4l2_input *);
  177. const struct v4l2_queryctrl *controls;
  178. int num_controls;
  179. };
  180. #define SOCAM_SENSE_PCLK_CHANGED (1 << 0)
  181. /**
  182. * This struct can be attached to struct soc_camera_device by the host driver
  183. * to request sense from the camera, for example, when calling .set_fmt(). The
  184. * host then can check which flags are set and verify respective values if any.
  185. * For example, if SOCAM_SENSE_PCLK_CHANGED is set, it means, pixclock has
  186. * changed during this operation. After completion the host should detach sense.
  187. *
  188. * @flags ored SOCAM_SENSE_* flags
  189. * @master_clock if the host wants to be informed about pixel-clock
  190. * change, it better set master_clock.
  191. * @pixel_clock_max maximum pixel clock frequency supported by the host,
  192. * camera is not allowed to exceed this.
  193. * @pixel_clock if the camera driver changed pixel clock during this
  194. * operation, it sets SOCAM_SENSE_PCLK_CHANGED, uses
  195. * master_clock to calculate the new pixel-clock and
  196. * sets this field.
  197. */
  198. struct soc_camera_sense {
  199. unsigned long flags;
  200. unsigned long master_clock;
  201. unsigned long pixel_clock_max;
  202. unsigned long pixel_clock;
  203. };
  204. static inline struct v4l2_queryctrl const *soc_camera_find_qctrl(
  205. struct soc_camera_ops *ops, int id)
  206. {
  207. int i;
  208. for (i = 0; i < ops->num_controls; i++)
  209. if (ops->controls[i].id == id)
  210. return &ops->controls[i];
  211. return NULL;
  212. }
  213. #define SOCAM_MASTER (1 << 0)
  214. #define SOCAM_SLAVE (1 << 1)
  215. #define SOCAM_HSYNC_ACTIVE_HIGH (1 << 2)
  216. #define SOCAM_HSYNC_ACTIVE_LOW (1 << 3)
  217. #define SOCAM_VSYNC_ACTIVE_HIGH (1 << 4)
  218. #define SOCAM_VSYNC_ACTIVE_LOW (1 << 5)
  219. #define SOCAM_DATAWIDTH_4 (1 << 6)
  220. #define SOCAM_DATAWIDTH_8 (1 << 7)
  221. #define SOCAM_DATAWIDTH_9 (1 << 8)
  222. #define SOCAM_DATAWIDTH_10 (1 << 9)
  223. #define SOCAM_DATAWIDTH_15 (1 << 10)
  224. #define SOCAM_DATAWIDTH_16 (1 << 11)
  225. #define SOCAM_PCLK_SAMPLE_RISING (1 << 12)
  226. #define SOCAM_PCLK_SAMPLE_FALLING (1 << 13)
  227. #define SOCAM_DATA_ACTIVE_HIGH (1 << 14)
  228. #define SOCAM_DATA_ACTIVE_LOW (1 << 15)
  229. #define SOCAM_DATAWIDTH_MASK (SOCAM_DATAWIDTH_4 | SOCAM_DATAWIDTH_8 | \
  230. SOCAM_DATAWIDTH_9 | SOCAM_DATAWIDTH_10 | \
  231. SOCAM_DATAWIDTH_15 | SOCAM_DATAWIDTH_16)
  232. static inline unsigned long soc_camera_bus_param_compatible(
  233. unsigned long camera_flags, unsigned long bus_flags)
  234. {
  235. unsigned long common_flags, hsync, vsync, pclk, data, buswidth, mode;
  236. common_flags = camera_flags & bus_flags;
  237. hsync = common_flags & (SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW);
  238. vsync = common_flags & (SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW);
  239. pclk = common_flags & (SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING);
  240. data = common_flags & (SOCAM_DATA_ACTIVE_HIGH | SOCAM_DATA_ACTIVE_LOW);
  241. mode = common_flags & (SOCAM_MASTER | SOCAM_SLAVE);
  242. buswidth = common_flags & SOCAM_DATAWIDTH_MASK;
  243. return (!hsync || !vsync || !pclk || !data || !mode || !buswidth) ? 0 :
  244. common_flags;
  245. }
  246. static inline void soc_camera_limit_side(unsigned int *start,
  247. unsigned int *length, unsigned int start_min,
  248. unsigned int length_min, unsigned int length_max)
  249. {
  250. if (*length < length_min)
  251. *length = length_min;
  252. else if (*length > length_max)
  253. *length = length_max;
  254. if (*start < start_min)
  255. *start = start_min;
  256. else if (*start > start_min + length_max - *length)
  257. *start = start_min + length_max - *length;
  258. }
  259. extern unsigned long soc_camera_apply_sensor_flags(struct soc_camera_link *icl,
  260. unsigned long flags);
  261. #endif