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/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2023-02-25 GuEe-GUI the first version
*/
#include <rtthread.h>
#include <rtdevice.h>
#include <mmu.h>
#include <rpi-sense.h>
struct rpisense_framebuffer
{
struct rt_graphic_device parent;
struct rpisense *rpisense;
rt_uint8_t *gamma;
rt_uint8_t vram[128];
rt_uint8_t vram_work[193];
rt_uint8_t gamma_user[32];
};
#define raw_to_rpisense_framebuffer(raw) rt_container_of(raw, struct rpisense_framebuffer, parent)
static rt_uint8_t gamma_default[32] =
{
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01,
0x02, 0x02, 0x03, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0e, 0x0f, 0x11,
0x12, 0x14, 0x15, 0x17, 0x19, 0x1b, 0x1d, 0x1f,
};
static rt_uint8_t gamma_low[32] =
{
0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02,
0x03, 0x03, 0x03, 0x04, 0x04, 0x05, 0x05, 0x06,
0x06, 0x07, 0x07, 0x08, 0x08, 0x09, 0x0a, 0x0a,
};
static void rpisense_fb_deferred_io(struct rpisense_framebuffer *rpisense_fb)
{
rt_uint8_t *gamma = rpisense_fb->gamma;
rt_uint8_t *vram_work = rpisense_fb->vram_work;
rt_uint16_t *vram = (rt_uint16_t *)rpisense_fb->vram;
struct rt_graphic_plane *primary_plane = rpisense_fb->parent.primary_plane;
vram_work[0] = 0;
for (int y = 0; y < primary_plane->height; ++y)
{
for (int x = 0; x < primary_plane->width; ++x)
{
vram_work[(y * 24) + x + 1] = gamma[(vram[(y * 8) + x] >> 11) & 0x1f];
vram_work[(y * 24) + (x + 8) + 1] = gamma[(vram[(y * 8) + x] >> 6) & 0x1f];
vram_work[(y * 24) + (x + 16) + 1] = gamma[(vram[(y * 8) + x]) & 0x1f];
}
}
rpisense_block_write(rpisense_fb->rpisense,
(const void *)vram_work, sizeof(rpisense_fb->vram_work));
}
static rt_err_t rpisense_fb_plane_update(struct rt_graphic_plane *plane,
struct rt_device_rect_info *rect)
{
struct rpisense_framebuffer *rpisense_fb = raw_to_rpisense_framebuffer(plane->graphic);
rpisense_fb_deferred_io(rpisense_fb);
return RT_EOK;
}
static rt_err_t rpisense_fb_plane_fb_remap(struct rt_graphic_plane *plane,
rt_uint32_t mode, struct rt_device_rect_info *rect)
{
struct rpisense_framebuffer *rpisense_fb = raw_to_rpisense_framebuffer(plane->graphic);
plane->line_length = 16;
plane->bits_per_pixel = 16;
plane->framebuffer = rpisense_fb->vram;
plane->screen_len = sizeof(rpisense_fb->vram);
plane->framebuffer_len = sizeof(rpisense_fb->vram);
return RT_EOK;
}
static const struct rt_graphic_plane_ops rpisense_fb_plane_ops =
{
.update = rpisense_fb_plane_update,
.fb_remap = rpisense_fb_plane_fb_remap,
};
static rt_err_t rpisense_fb_wait_vsync(struct rt_graphic_device *gdev)
{
struct rpisense_framebuffer *rpisense_fb = raw_to_rpisense_framebuffer(gdev);
rpisense_fb_deferred_io(rpisense_fb);
return RT_EOK;
}
static rt_err_t rpisense_fb_control(struct rt_graphic_device *gdev, int cmd, void *args)
{
rt_err_t err = RT_EOK;
struct rpisense_framebuffer *rpisense_fb = raw_to_rpisense_framebuffer(gdev);
switch (cmd)
{
case SENSEFB_FBIOGET_GAMMA:
rt_memcpy(args, rpisense_fb->gamma, sizeof(rpisense_fb->gamma_user));
break;
case SENSEFB_FBIOSET_GAMMA:
rt_memcpy(rpisense_fb->gamma_user, args, sizeof(rpisense_fb->gamma_user));
rpisense_fb->gamma = rpisense_fb->gamma_user;
break;
case SENSEFB_FBIORESET_GAMMA:
switch ((rt_ubase_t)args)
{
case 0:
rpisense_fb->gamma = gamma_default;
break;
case 1:
rpisense_fb->gamma = gamma_low;
break;
case 2:
rpisense_fb->gamma = rpisense_fb->gamma_user;
break;
default:
err = -RT_EINVAL;
break;
}
break;
default:
err = -RT_ENOSYS;
break;
}
return err;
}
static const struct rt_graphic_device_ops rpisense_fb_ops =
{
.wait_vsync = rpisense_fb_wait_vsync,
.control = rpisense_fb_control,
};
static rt_uint32_t rpisense_fb_modes[] =
{
RTGRAPHIC_PIXEL_FORMAT_RGB565,
};
static rt_err_t rpisense_fb_probe(struct rt_platform_device *pdev)
{
rt_err_t err;
struct rpisense *rpisense = pdev->priv;
struct rpisense_framebuffer *rpisense_fb = rt_calloc(1, sizeof(*rpisense_fb));
if (!rpisense_fb)
{
return -RT_ENOMEM;
}
rpisense_fb->rpisense = rpisense;
rpisense_fb->gamma = gamma_default;
rpisense_fb->parent.ops = &rpisense_fb_ops;
if ((err = rt_graphic_device_simple_register(&rpisense_fb->parent,
8, 8, 0, &rpisense_fb_plane_ops,
rpisense_fb_modes, RT_ARRAY_SIZE(rpisense_fb_modes))))
{
goto _fail;
}
return RT_EOK;
_fail:
rt_free(rpisense_fb);
return err;
}
static rt_err_t rpisense_fb_remove(struct rt_platform_device *pdev)
{
struct rt_device *dev = &pdev->parent;
rt_device_unregister(&pdev->parent);
rt_free(rt_container_of(dev->user_data, struct rpisense_framebuffer, parent));
return RT_EOK;
}
static struct rt_platform_driver rpisense_fb_driver =
{
.name = "rpi-sense-fb",
.probe = rpisense_fb_probe,
.remove = rpisense_fb_remove,
};
RT_PLATFORM_DRIVER_EXPORT(rpisense_fb_driver);
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