electronics/lw35-upgrade
1
0
Fork 0
Code Issues 6 Pull Requests Releases Wiki Activity

display: kernel-driver: rework color-to-bw conversion

Browse Source
This commit is contained in:
Markus Koch 2019-11-01 19:51:10 +01:00
parent f0f671c6fb
commit 1e4ba2c739
1 changed files with 15 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
display/kernel-driver/lmg6202ulyt.c
View File

@ -8,8 +8,7 @@
#include <linux/gpio/consumer.h> #include <linux/gpio/consumer.h>
#include <linux/fb.h> #include <linux/fb.h>
#define BPP 8 // 8 #define BPP 16
#define PIX_THRESHOLD 0
#define LMGE_GPIO 100 #define LMGE_GPIO 100
#define LMGE_OTHER 99 #define LMGE_OTHER 99
@ -21,9 +20,9 @@ MODULE_AUTHOR("Markus Koch");
MODULE_DESCRIPTION("lmg6202ulyt display driver"); MODULE_DESCRIPTION("lmg6202ulyt display driver");
MODULE_VERSION("0.1"); MODULE_VERSION("0.1");
static char *testparam = "param"; static int pix_threshold = 0;
module_param(testparam, charp, S_IRUGO); module_param(pix_threshold, int, 0);
MODULE_PARM_DESC(testparam, "A test parameter"); MODULE_PARM_DESC(pix_threshold, "Black / White threshold. 0-255");
static struct of_device_id lmg6202ulyt_dt_ids[] = { static struct of_device_id lmg6202ulyt_dt_ids[] = {
{ .compatible = "hitachi,lmg6202ulyt", }, { .compatible = "hitachi,lmg6202ulyt", },
@ -122,7 +121,9 @@ static int lmg6202ulyt_init_fix(struct lmg6202ulyt_priv *priv)
else else
fix->visual = FB_VISUAL_TRUECOLOR; fix->visual = FB_VISUAL_TRUECOLOR;
printk(KERN_INFO "lmg6202ulyt: Using %d bpp.\n", var->bits_per_pixel); printk(KERN_INFO "lmg6202ulyt: Using %d bpp (%s).\n",
var->bits_per_pixel,
(var->grayscale ? "grayscale" : "truecolor"));
return 0; return 0;
} }
@ -209,6 +210,7 @@ void lmg6202ulyt_deferred_io(struct fb_info *info, struct list_head *pagelist)
int i; int i;
int blk; int blk;
char __iomem *pixel; char __iomem *pixel;
char pixval;
int txsz; int txsz;
spi_write(priv->spi, buf, 5); spi_write(priv->spi, buf, 5);
@ -219,7 +221,13 @@ void lmg6202ulyt_deferred_io(struct fb_info *info, struct list_head *pagelist)
buf[0] = 1; buf[0] = 1;
for (i = 0; i < BLOCKSIZE * 8; i++) { for (i = 0; i < BLOCKSIZE * 8; i++) {
if (*pixel > PIX_THRESHOLD) { #if BPP == 8
pixval = *(pixel);
#else
pixval = *(pixel + 1);
// TODO: We should have more cases here for higher BPPs
#endif
if (pixval > pix_threshold) {
buf[(i / 8) + 1] |= (1 << (7 - (i % 8))); buf[(i / 8) + 1] |= (1 << (7 - (i % 8)));
} }
if (pixel >= info->screen_base + info->screen_size - ((info->var.bits_per_pixel) / 8)) if (pixel >= info->screen_base + info->screen_size - ((info->var.bits_per_pixel) / 8))