include/drm/tinydrm/tinydrm-helpers.h

   1 /*
   2  * Copyright (C) 2016 Noralf Trønnes
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  */
   9
  10 #ifndef __LINUX_TINYDRM_HELPERS_H
  11 #define __LINUX_TINYDRM_HELPERS_H
  12
  13 struct backlight_device;
  14 struct tinydrm_device;
  15 struct drm_clip_rect;
  16 struct spi_transfer;
  17 struct spi_message;
  18 struct spi_device;
  19 struct device;
  20
  21 /**
  22  * tinydrm_machine_little_endian - Machine is little endian
  23  *
  24  * Returns:
  25  * true if *defined(__LITTLE_ENDIAN)*, false otherwise
  26  */
  27 static inline bool tinydrm_machine_little_endian(void)
  28 {
  29 #if defined(__LITTLE_ENDIAN)
  30         return true;
  31 #else
  32         return false;
  33 #endif
  34 }
  35
  36 bool tinydrm_merge_clips(struct drm_clip_rect *dst,
  37                          struct drm_clip_rect *src, unsigned int num_clips,
  38                          unsigned int flags, u32 max_width, u32 max_height);
  39 void tinydrm_memcpy(void *dst, void *vaddr, struct drm_framebuffer *fb,
  40                     struct drm_clip_rect *clip);
  41 void tinydrm_swab16(u16 *dst, void *vaddr, struct drm_framebuffer *fb,
  42                     struct drm_clip_rect *clip);
  43 void tinydrm_xrgb8888_to_rgb565(u16 *dst, void *vaddr,
  44                                 struct drm_framebuffer *fb,
  45                                 struct drm_clip_rect *clip, bool swap);
  46 void tinydrm_xrgb8888_to_gray8(u8 *dst, void *vaddr, struct drm_framebuffer *fb,
  47                                struct drm_clip_rect *clip);
  48
  49 struct backlight_device *tinydrm_of_find_backlight(struct device *dev);
  50 int tinydrm_enable_backlight(struct backlight_device *backlight);
  51 int tinydrm_disable_backlight(struct backlight_device *backlight);
  52
  53 size_t tinydrm_spi_max_transfer_size(struct spi_device *spi, size_t max_len);
  54 bool tinydrm_spi_bpw_supported(struct spi_device *spi, u8 bpw);
  55 int tinydrm_spi_transfer(struct spi_device *spi, u32 speed_hz,
  56                          struct spi_transfer *header, u8 bpw, const void *buf,
  57                          size_t len);
  58 void _tinydrm_dbg_spi_message(struct spi_device *spi, struct spi_message *m);
  59
  60 #ifdef DEBUG
  61 /**
  62  * tinydrm_dbg_spi_message - Dump SPI message
  63  * @spi: SPI device
  64  * @m: SPI message
  65  *
  66  * Dumps info about the transfers in a SPI message including buffer content.
  67  * DEBUG has to be defined for this function to be enabled alongside setting
  68  * the DRM_UT_DRIVER bit of &drm_debug.
  69  */
  70 static inline void tinydrm_dbg_spi_message(struct spi_device *spi,
  71                                            struct spi_message *m)
  72 {
  73         if (drm_debug & DRM_UT_DRIVER)
  74                 _tinydrm_dbg_spi_message(spi, m);
  75 }
  76 #else
  77 static inline void tinydrm_dbg_spi_message(struct spi_device *spi,
  78                                            struct spi_message *m)
  79 {
  80 }
  81 #endif /* DEBUG */
  82
  83 #endif /* __LINUX_TINYDRM_HELPERS_H */