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drm/tinydrm: Add helper functions

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Add common functionality needed by many tinydrm drivers.

Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Noralf Trønnes 2017-01-22 00:19:51 +01:00
parent fa201ac2c6
commit 9f69eb5c36
5 changed files with 572 additions and 1 deletions
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100
include/drm/tinydrm/tinydrm-helpers.h Normal file
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/*
* Copyright (C) 2016 Noralf Trønnes
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#ifndef __LINUX_TINYDRM_HELPERS_H
#define __LINUX_TINYDRM_HELPERS_H
struct backlight_device;
struct tinydrm_device;
struct drm_clip_rect;
struct spi_transfer;
struct spi_message;
struct spi_device;
struct device;
/**
* tinydrm_machine_little_endian - Machine is little endian
*
* Returns:
* true if *defined(__LITTLE_ENDIAN)*, false otherwise
*/
static inline bool tinydrm_machine_little_endian(void)
{
#if defined(__LITTLE_ENDIAN)
return true;
#else
return false;
#endif
}
bool tinydrm_merge_clips(struct drm_clip_rect *dst,
struct drm_clip_rect *src, unsigned int num_clips,
unsigned int flags, u32 max_width, u32 max_height);
void tinydrm_memcpy(void *dst, void *vaddr, struct drm_framebuffer *fb,
struct drm_clip_rect *clip);
void tinydrm_swab16(u16 *dst, void *vaddr, struct drm_framebuffer *fb,
struct drm_clip_rect *clip);
void tinydrm_xrgb8888_to_rgb565(u16 *dst, void *vaddr,
struct drm_framebuffer *fb,
struct drm_clip_rect *clip, bool swap);
#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
struct backlight_device *tinydrm_of_find_backlight(struct device *dev);
int tinydrm_enable_backlight(struct backlight_device *backlight);
int tinydrm_disable_backlight(struct backlight_device *backlight);
#else
static inline struct backlight_device *
tinydrm_of_find_backlight(struct device *dev)
{
return NULL;
}
static inline int tinydrm_enable_backlight(struct backlight_device *backlight)
{
return 0;
}
static inline int
tinydrm_disable_backlight(struct backlight_device *backlight)
{
return 0;
}
#endif
size_t tinydrm_spi_max_transfer_size(struct spi_device *spi, size_t max_len);
bool tinydrm_spi_bpw_supported(struct spi_device *spi, u8 bpw);
int tinydrm_spi_transfer(struct spi_device *spi, u32 speed_hz,
struct spi_transfer *header, u8 bpw, const void *buf,
size_t len);
void _tinydrm_dbg_spi_message(struct spi_device *spi, struct spi_message *m);
#ifdef DEBUG
/**
* tinydrm_dbg_spi_message - Dump SPI message
* @spi: SPI device
* @m: SPI message
*
* Dumps info about the transfers in a SPI message including buffer content.
* DEBUG has to be defined for this function to be enabled alongside setting
* the DRM_UT_DRIVER bit of &drm_debug.
*/
static inline void tinydrm_dbg_spi_message(struct spi_device *spi,
struct spi_message *m)
{
if (drm_debug & DRM_UT_DRIVER)
_tinydrm_dbg_spi_message(spi, m);
}
#else
static inline void tinydrm_dbg_spi_message(struct spi_device *spi,
struct spi_message *m)
{
}
#endif /* DEBUG */
#endif /* __LINUX_TINYDRM_HELPERS_H */