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);
46void tinydrm_xrgb8888_to_gray8(u8 *dst, void *vaddr, struct drm_framebuffer *fb,
47			       struct drm_clip_rect *clip);
48
49size_t tinydrm_spi_max_transfer_size(struct spi_device *spi, size_t max_len);
50bool tinydrm_spi_bpw_supported(struct spi_device *spi, u8 bpw);
51int tinydrm_spi_transfer(struct spi_device *spi, u32 speed_hz,
52			 struct spi_transfer *header, u8 bpw, const void *buf,
53			 size_t len);
54void _tinydrm_dbg_spi_message(struct spi_device *spi, struct spi_message *m);
55
56#ifdef DEBUG
57/**
58 * tinydrm_dbg_spi_message - Dump SPI message
59 * @spi: SPI device
60 * @m: SPI message
61 *
62 * Dumps info about the transfers in a SPI message including buffer content.
63 * DEBUG has to be defined for this function to be enabled alongside setting
64 * the DRM_UT_DRIVER bit of &drm_debug.
65 */
66static inline void tinydrm_dbg_spi_message(struct spi_device *spi,
67					   struct spi_message *m)
68{
69	if (drm_debug & DRM_UT_DRIVER)
70		_tinydrm_dbg_spi_message(spi, m);
71}
72#else
73static inline void tinydrm_dbg_spi_message(struct spi_device *spi,
74					   struct spi_message *m)
75{
76}
77#endif /* DEBUG */
78
79#endif /* __LINUX_TINYDRM_HELPERS_H */