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From 15cf5667c9508d18808e0edf95acbff0313ef954 Mon Sep 17 00:00:00 2001
From: Serge Schneider <serge@raspberrypi.org>
Date: Mon, 17 Aug 2015 18:06:16 +0100
Subject: [PATCH 161/203] rpisense-fb: add low-light mode and gamma control
---
drivers/video/fbdev/rpisense-fb.c | 68 +++++++++++++++++++++++++++++---
include/linux/mfd/rpisense/framebuffer.h | 6 ++-
2 files changed, 68 insertions(+), 6 deletions(-)
--- a/drivers/video/fbdev/rpisense-fb.c
+++ b/drivers/video/fbdev/rpisense-fb.c
@@ -19,6 +19,7 @@
#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>
@@ -26,22 +27,35 @@
#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;
@@ -127,6 +141,46 @@ static struct fb_deferred_io rpisense_fb
.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,
@@ -134,6 +188,7 @@ static struct fb_ops rpisense_fb_ops = {
.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)
@@ -171,6 +226,9 @@ static int rpisense_fb_probe(struct plat
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);
--- a/include/linux/mfd/rpisense/framebuffer.h
+++ b/include/linux/mfd/rpisense/framebuffer.h
@@ -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;
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