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rpisense-fb: add low-light mode and gamma control #1104

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Aug 17, 2015
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rpisense-fb: add low-light mode and gamma control #1104

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68 changes: 63 additions & 5 deletions drivers/video/fbdev/rpisense-fb.c
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Original file line number Diff line number Diff line change
Expand Up @@ -19,29 +19,43 @@
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/init.h>

#include <linux/mfd/rpisense/framebuffer.h>
#include <linux/mfd/rpisense/core.h>

static bool lowlight;
module_param(lowlight, bool, 0);
MODULE_PARM_DESC(lowlight, "Reduce LED matrix brightness to one third");

struct rpisense *rpisense;

struct rpisense_fb_param {
char __iomem *vmem;
u8 *vmem_work;
u32 vmemsize;
u8 gamma[32];
u8 *gamma;
};

static u8 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 u8 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 u8 gamma_user[32];

static struct rpisense_fb_param rpisense_fb_param = {
.vmem = NULL,
.vmemsize = 128,
.gamma = {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,},
.gamma = gamma_default,
};

static struct fb_deferred_io rpisense_fb_defio;
Expand Down Expand Up @@ -127,13 +141,54 @@ static struct fb_deferred_io rpisense_fb_defio = {
.deferred_io = rpisense_fb_deferred_io,
};

static int rpisense_fb_ioctl(struct fb_info *info, unsigned int cmd,
unsigned long arg)
{
switch (cmd) {
case SENSEFB_FBIOGET_GAMMA:
if (copy_to_user((void __user *) arg, rpisense_fb_param.gamma,
sizeof(u8[32])))
return -EFAULT;
return 0;
case SENSEFB_FBIOSET_GAMMA:
if (copy_from_user(gamma_user, (void __user *)arg,
sizeof(u8[32])))
return -EFAULT;
rpisense_fb_param.gamma = gamma_user;
schedule_delayed_work(&info->deferred_work,
rpisense_fb_defio.delay);
return 0;
case SENSEFB_FBIORESET_GAMMA:
switch (arg) {
case 0:
rpisense_fb_param.gamma = gamma_default;
break;
case 1:
rpisense_fb_param.gamma = gamma_low;
break;
case 2:
rpisense_fb_param.gamma = gamma_user;
break;
default:
return -EINVAL;
}
schedule_delayed_work(&info->deferred_work,
rpisense_fb_defio.delay);
break;
default:
return -EINVAL;
}
return 0;
}

static struct fb_ops rpisense_fb_ops = {
.owner = THIS_MODULE,
.fb_read = fb_sys_read,
.fb_write = rpisense_fb_write,
.fb_fillrect = rpisense_fb_fillrect,
.fb_copyarea = rpisense_fb_copyarea,
.fb_imageblit = rpisense_fb_imageblit,
.fb_ioctl = rpisense_fb_ioctl,
};

static int rpisense_fb_probe(struct platform_device *pdev)
Expand Down Expand Up @@ -171,6 +226,9 @@ static int rpisense_fb_probe(struct platform_device *pdev)
info->screen_base = rpisense_fb_param.vmem;
info->screen_size = rpisense_fb_param.vmemsize;

if (lowlight)
rpisense_fb_param.gamma = gamma_low;

fb_deferred_io_init(info);

ret = register_framebuffer(info);
Expand Down
6 changes: 5 additions & 1 deletion include/linux/mfd/rpisense/framebuffer.h
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Original file line number Diff line number Diff line change
Expand Up @@ -16,7 +16,11 @@
#ifndef __LINUX_RPISENSE_FB_H_
#define __LINUX_RPISENSE_FB_H_

#include <linux/platform_device.h>
#define SENSEFB_FBIO_IOC_MAGIC 0xF1

#define SENSEFB_FBIOGET_GAMMA _IO(SENSEFB_FBIO_IOC_MAGIC, 0)
#define SENSEFB_FBIOSET_GAMMA _IO(SENSEFB_FBIO_IOC_MAGIC, 1)
#define SENSEFB_FBIORESET_GAMMA _IO(SENSEFB_FBIO_IOC_MAGIC, 2)

struct rpisense;

Expand Down