forked from Minki/linux
staging: fbtft: add fb_ssd1306 driver
This commit adds the fb_ssd1306 driver from the fbtft project at https://github.com/notro/fbtft. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Noralf Tronnes <notro@tronnes.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thomas Petazzoni
Greg Kroah-Hartman
parent
5dc5e4fb11
commit
39837b9158
@ -103,3 +103,9 @@ config FB_TFT_SSD1289
|
||||
depends on FB_TFT
|
||||
help
|
||||
Framebuffer support for SSD1289
|
||||
|
||||
config FB_TFT_SSD1306
|
||||
tristate "FB driver for the SSD1306 OLED Controller"
|
||||
depends on FB_TFT
|
||||
help
|
||||
Framebuffer support for SSD1306
|
||||
|
||||
@ -19,3 +19,4 @@ obj-$(CONFIG_FB_TFT_RA8875) += fb_ra8875.o
|
||||
obj-$(CONFIG_FB_TFT_S6D02A1) += fb_s6d02a1.o
|
||||
obj-$(CONFIG_FB_TFT_S6D1121) += fb_s6d1121.o
|
||||
obj-$(CONFIG_FB_TFT_SSD1289) += fb_ssd1289.o
|
||||
obj-$(CONFIG_FB_TFT_SSD1306) += fb_ssd1306.o
|
||||
|
||||
229
drivers/staging/fbtft/fb_ssd1306.c
Normal file
229
drivers/staging/fbtft/fb_ssd1306.c
Normal file
@ -0,0 +1,229 @@
|
||||
/*
|
||||
* FB driver for the SSD1306 OLED Controller
|
||||
*
|
||||
* Copyright (C) 2013 Noralf Tronnes
|
||||
*
|
||||
* 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.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, write to the Free Software
|
||||
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
||||
*/
|
||||
|
||||
#include <linux/module.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/gpio.h>
|
||||
#include <linux/delay.h>
|
||||
|
||||
#include "fbtft.h"
|
||||
|
||||
#define DRVNAME "fb_ssd1306"
|
||||
#define WIDTH 128
|
||||
#define HEIGHT 64
|
||||
|
||||
|
||||
/*
|
||||
write_reg() caveat:
|
||||
|
||||
This doesn't work because D/C has to be LOW for both values:
|
||||
write_reg(par, val1, val2);
|
||||
|
||||
Do it like this:
|
||||
write_reg(par, val1);
|
||||
write_reg(par, val2);
|
||||
*/
|
||||
|
||||
/* Init sequence taken from the Adafruit SSD1306 Arduino library */
|
||||
static int init_display(struct fbtft_par *par)
|
||||
{
|
||||
fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
|
||||
|
||||
par->fbtftops.reset(par);
|
||||
|
||||
if (par->gamma.curves[0] == 0) {
|
||||
mutex_lock(&par->gamma.lock);
|
||||
if (par->info->var.yres == 64)
|
||||
par->gamma.curves[0] = 0xCF;
|
||||
else
|
||||
par->gamma.curves[0] = 0x8F;
|
||||
mutex_unlock(&par->gamma.lock);
|
||||
}
|
||||
|
||||
/* Set Display OFF */
|
||||
write_reg(par, 0xAE);
|
||||
|
||||
/* Set Display Clock Divide Ratio/ Oscillator Frequency */
|
||||
write_reg(par, 0xD5);
|
||||
write_reg(par, 0x80);
|
||||
|
||||
/* Set Multiplex Ratio */
|
||||
write_reg(par, 0xA8);
|
||||
if (par->info->var.yres == 64)
|
||||
write_reg(par, 0x3F);
|
||||
else
|
||||
write_reg(par, 0x1F);
|
||||
|
||||
/* Set Display Offset */
|
||||
write_reg(par, 0xD3);
|
||||
write_reg(par, 0x0);
|
||||
|
||||
/* Set Display Start Line */
|
||||
write_reg(par, 0x40 | 0x0);
|
||||
|
||||
/* Charge Pump Setting */
|
||||
write_reg(par, 0x8D);
|
||||
/* A[2] = 1b, Enable charge pump during display on */
|
||||
write_reg(par, 0x14);
|
||||
|
||||
/* Set Memory Addressing Mode */
|
||||
write_reg(par, 0x20);
|
||||
/* Vertical addressing mode */
|
||||
write_reg(par, 0x01);
|
||||
|
||||
/*Set Segment Re-map */
|
||||
/* column address 127 is mapped to SEG0 */
|
||||
write_reg(par, 0xA0 | 0x1);
|
||||
|
||||
/* Set COM Output Scan Direction */
|
||||
/* remapped mode. Scan from COM[N-1] to COM0 */
|
||||
write_reg(par, 0xC8);
|
||||
|
||||
/* Set COM Pins Hardware Configuration */
|
||||
write_reg(par, 0xDA);
|
||||
if (par->info->var.yres == 64)
|
||||
/* A[4]=1b, Alternative COM pin configuration */
|
||||
write_reg(par, 0x12);
|
||||
else
|
||||
/* A[4]=0b, Sequential COM pin configuration */
|
||||
write_reg(par, 0x02);
|
||||
|
||||
/* Set Pre-charge Period */
|
||||
write_reg(par, 0xD9);
|
||||
write_reg(par, 0xF1);
|
||||
|
||||
/* Set VCOMH Deselect Level */
|
||||
write_reg(par, 0xDB);
|
||||
/* according to the datasheet, this value is out of bounds */
|
||||
write_reg(par, 0x40);
|
||||
|
||||
/* Entire Display ON */
|
||||
/* Resume to RAM content display. Output follows RAM content */
|
||||
write_reg(par, 0xA4);
|
||||
|
||||
/* Set Normal Display
|
||||
0 in RAM: OFF in display panel
|
||||
1 in RAM: ON in display panel */
|
||||
write_reg(par, 0xA6);
|
||||
|
||||
/* Set Display ON */
|
||||
write_reg(par, 0xAF);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
|
||||
{
|
||||
fbtft_par_dbg(DEBUG_SET_ADDR_WIN, par,
|
||||
"%s(xs=%d, ys=%d, xe=%d, ye=%d)\n", __func__, xs, ys, xe, ye);
|
||||
|
||||
/* Set Lower Column Start Address for Page Addressing Mode */
|
||||
write_reg(par, 0x00 | 0x0);
|
||||
/* Set Higher Column Start Address for Page Addressing Mode */
|
||||
write_reg(par, 0x10 | 0x0);
|
||||
/* Set Display Start Line */
|
||||
write_reg(par, 0x40 | 0x0);
|
||||
}
|
||||
|
||||
static int blank(struct fbtft_par *par, bool on)
|
||||
{
|
||||
fbtft_par_dbg(DEBUG_BLANK, par, "%s(blank=%s)\n",
|
||||
__func__, on ? "true" : "false");
|
||||
|
||||
if (on)
|
||||
write_reg(par, 0xAE);
|
||||
else
|
||||
write_reg(par, 0xAF);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Gamma is used to control Contrast */
|
||||
static int set_gamma(struct fbtft_par *par, unsigned long *curves)
|
||||
{
|
||||
fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
|
||||
|
||||
/* apply mask */
|
||||
curves[0] &= 0xFF;
|
||||
|
||||
/* Set Contrast Control for BANK0 */
|
||||
write_reg(par, 0x81);
|
||||
write_reg(par, curves[0]);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int write_vmem(struct fbtft_par *par, size_t offset, size_t len)
|
||||
{
|
||||
u16 *vmem16 = (u16 *)par->info->screen_base;
|
||||
u8 *buf = par->txbuf.buf;
|
||||
int x, y, i;
|
||||
int ret = 0;
|
||||
|
||||
fbtft_par_dbg(DEBUG_WRITE_VMEM, par, "%s()\n", __func__);
|
||||
|
||||
for (x = 0; x < par->info->var.xres; x++) {
|
||||
for (y = 0; y < par->info->var.yres/8; y++) {
|
||||
*buf = 0x00;
|
||||
for (i = 0; i < 8; i++)
|
||||
*buf |= (vmem16[(y*8+i)*par->info->var.xres+x] ? 1 : 0) << i;
|
||||
buf++;
|
||||
}
|
||||
}
|
||||
|
||||
/* Write data */
|
||||
gpio_set_value(par->gpio.dc, 1);
|
||||
ret = par->fbtftops.write(par, par->txbuf.buf,
|
||||
par->info->var.xres*par->info->var.yres/8);
|
||||
if (ret < 0)
|
||||
dev_err(par->info->device,
|
||||
"%s: write failed and returned: %d\n", __func__, ret);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
|
||||
static struct fbtft_display display = {
|
||||
.regwidth = 8,
|
||||
.width = WIDTH,
|
||||
.height = HEIGHT,
|
||||
.gamma_num = 1,
|
||||
.gamma_len = 1,
|
||||
.gamma = "00",
|
||||
.fbtftops = {
|
||||
.write_vmem = write_vmem,
|
||||
.init_display = init_display,
|
||||
.set_addr_win = set_addr_win,
|
||||
.blank = blank,
|
||||
.set_gamma = set_gamma,
|
||||
},
|
||||
};
|
||||
|
||||
|
||||
FBTFT_REGISTER_DRIVER(DRVNAME, "solomon,ssd1306", &display);
|
||||
|
||||
MODULE_ALIAS("spi:" DRVNAME);
|
||||
MODULE_ALIAS("platform:" DRVNAME);
|
||||
MODULE_ALIAS("spi:ssd1306");
|
||||
MODULE_ALIAS("platform:ssd1306");
|
||||
|
||||
MODULE_DESCRIPTION("SSD1306 OLED Driver");
|
||||
MODULE_AUTHOR("Noralf Tronnes");
|
||||
MODULE_LICENSE("GPL");
|
||||
Loading…
Reference in New Issue
Block a user