LXR linux/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
  13struct backlight_device;
  14struct tinydrm_device;
  15struct drm_clip_rect;
  16struct spi_transfer;
  17struct spi_message;
  18struct spi_device;
  19struct device;
  20
  21/**
  22 * tinydrm_machine_little_endian - Machine is little endian
  23 *
  24 * Returns:
  25 * true if *defined(__LITTLE_ENDIAN)*, false otherwise
  26 */
  27static 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
  36bool 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);
  39void tinydrm_memcpy(void *dst, void *vaddr, struct drm_framebuffer *fb,
  40                    struct drm_clip_rect *clip);
  41void tinydrm_swab16(u16 *dst, void *vaddr, struct drm_framebuffer *fb,
  42                    struct drm_clip_rect *clip);
  43void tinydrm_xrgb8888_to_rgb565(u16 *dst, void *vaddr,
  44                                struct drm_framebuffer *fb,
  45                                struct drm_clip_rect *clip, bool swap);
  46
  47struct backlight_device *tinydrm_of_find_backlight(struct device *dev);
  48int tinydrm_enable_backlight(struct backlight_device *backlight);
  49int tinydrm_disable_backlight(struct backlight_device *backlight);
  50
  51size_t tinydrm_spi_max_transfer_size(struct spi_device *spi, size_t max_len);
  52bool tinydrm_spi_bpw_supported(struct spi_device *spi, u8 bpw);
  53int tinydrm_spi_transfer(struct spi_device *spi, u32 speed_hz,
  54                         struct spi_transfer *header, u8 bpw, const void *buf,
  55                         size_t len);
  56void _tinydrm_dbg_spi_message(struct spi_device *spi, struct spi_message *m);
  57
  58#ifdef DEBUG
  59/**
  60 * tinydrm_dbg_spi_message - Dump SPI message
  61 * @spi: SPI device
  62 * @m: SPI message
  63 *
  64 * Dumps info about the transfers in a SPI message including buffer content.
  65 * DEBUG has to be defined for this function to be enabled alongside setting
  66 * the DRM_UT_DRIVER bit of &drm_debug.
  67 */
  68static inline void tinydrm_dbg_spi_message(struct spi_device *spi,
  69                                           struct spi_message *m)
  70{
  71        if (drm_debug & DRM_UT_DRIVER)
  72                _tinydrm_dbg_spi_message(spi, m);
  73}
  74#else
  75static inline void tinydrm_dbg_spi_message(struct spi_device *spi,
  76                                           struct spi_message *m)
  77{
  78}
  79#endif /* DEBUG */
  80
  81#endif /* __LINUX_TINYDRM_HELPERS_H */
  82