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author | Heiner Kallweit <hkallweit1@gmail.com> | 2017-02-28 08:10:38 +0100 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-03-06 09:17:08 +0100 |
commit | 079306e979d7f8bb1081ce43c7fc1fa8c1d45d55 (patch) | |
tree | 95d4bb80d5f938aed0c84cf68de7671af2b75fb3 /drivers/staging | |
parent | 2fad31423d1db01a341b4a7fac697e1af128c281 (diff) | |
download | op-kernel-dev-079306e979d7f8bb1081ce43c7fc1fa8c1d45d55.zip op-kernel-dev-079306e979d7f8bb1081ce43c7fc1fa8c1d45d55.tar.gz |
staging: fbtft: add adriver for SH1106
This patch adds support for the SH1106 OLED controller chip.
It's similar to the SSD1306, however it supports only a subset of
commands and the internal video memory has a different width.
Major differences:
- Internal video memory has a width of 132 pixels
- Only a subset of commands is supported
- Only page addressing mode is supported, no support for vertical and
horizontal addressing
- SPI frequency limited to 2 MHz according to the datasheet
Successfully tested with a 1.3" OLED display with this chip and
SPI interface.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging')
-rw-r--r-- | drivers/staging/fbtft/Kconfig | 6 | ||||
-rw-r--r-- | drivers/staging/fbtft/Makefile | 1 | ||||
-rw-r--r-- | drivers/staging/fbtft/fb_sh1106.c | 203 |
3 files changed, 210 insertions, 0 deletions
diff --git a/drivers/staging/fbtft/Kconfig b/drivers/staging/fbtft/Kconfig index 6f5e824..dba6767 100644 --- a/drivers/staging/fbtft/Kconfig +++ b/drivers/staging/fbtft/Kconfig @@ -111,6 +111,12 @@ config FB_TFT_S6D1121 help Generic Framebuffer support for S6D1121 +config FB_TFT_SH1106 + tristate "FB driver for the SH1106 OLED Controller" + depends on FB_TFT + help + Framebuffer support for SH1106 + config FB_TFT_SSD1289 tristate "FB driver for the SSD1289 LCD Controller" depends on FB_TFT diff --git a/drivers/staging/fbtft/Makefile b/drivers/staging/fbtft/Makefile index 2725ea9..05ae9fb 100644 --- a/drivers/staging/fbtft/Makefile +++ b/drivers/staging/fbtft/Makefile @@ -20,6 +20,7 @@ obj-$(CONFIG_FB_TFT_PCD8544) += fb_pcd8544.o obj-$(CONFIG_FB_TFT_RA8875) += fb_ra8875.o obj-$(CONFIG_FB_TFT_S6D02A1) += fb_s6d02a1.o obj-$(CONFIG_FB_TFT_S6D1121) += fb_s6d1121.o +obj-$(CONFIG_FB_TFT_SH1106) += fb_sh1106.o obj-$(CONFIG_FB_TFT_SSD1289) += fb_ssd1289.o obj-$(CONFIG_FB_TFT_SSD1305) += fb_ssd1305.o obj-$(CONFIG_FB_TFT_SSD1306) += fb_ssd1306.o diff --git a/drivers/staging/fbtft/fb_sh1106.c b/drivers/staging/fbtft/fb_sh1106.c new file mode 100644 index 0000000..b7896e5 --- /dev/null +++ b/drivers/staging/fbtft/fb_sh1106.c @@ -0,0 +1,203 @@ +/* + * FB driver for the SH1106 OLED Controller + * Based on the SSD1306 driver by Noralf Tronnes + * + * Copyright (C) 2017 Heiner Kallweit + * + * 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. + */ + +#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_sh1106" +#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 based on the Adafruit SSD1306 Arduino library */ +static int init_display(struct fbtft_par *par) +{ + if (!par->info->var.xres || par->info->var.xres > WIDTH || + !par->info->var.yres || par->info->var.yres > HEIGHT || + par->info->var.yres % 8) { + dev_err(par->info->device, "Invalid screen size\n"); + return -EINVAL; + } + + if (par->info->var.rotate) { + dev_err(par->info->device, "Display rotation not supported\n"); + return -EINVAL; + } + + par->fbtftops.reset(par); + + /* 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); + write_reg(par, par->info->var.yres - 1); + + /* Set Display Offset */ + write_reg(par, 0xD3); + write_reg(par, 0x0); + + /* Set Display Start Line */ + write_reg(par, 0x40 | 0x0); + + /* 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 if (par->info->var.yres == 48) + /* 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); + write_reg(par, 0x40); + + /* Set Display ON */ + write_reg(par, 0xAF); + + msleep(150); + + return 0; +} + +static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye) +{ +} + +static int blank(struct fbtft_par *par, bool on) +{ + fbtft_par_dbg(DEBUG_BLANK, par, "%s(blank=%s)\n", + __func__, on ? "true" : "false"); + + write_reg(par, on ? 0xAE : 0xAF); + + return 0; +} + +/* Gamma is used to control Contrast */ +static int set_gamma(struct fbtft_par *par, u32 *curves) +{ + /* 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_buffer; + u32 xres = par->info->var.xres; + int page, page_start, page_end, x, i, ret; + u8 *buf = par->txbuf.buf; + + /* offset refers to vmem with 2 bytes element size */ + page_start = offset / (8 * 2 * xres); + page_end = DIV_ROUND_UP(offset + len, 8 * 2 * xres); + + for (page = page_start; page < page_end; page++) { + /* set page */ + write_reg(par, 0xb0 | page); + /* set column to 2 to compensate for vidmem width 132 */ + write_reg(par, 0x00 | 2); + write_reg(par, 0x10 | 0); + + memset(buf, 0, xres); + for (x = 0; x < xres; x++) + for (i = 0; i < 8; i++) + if (vmem16[(page * 8 + i) * xres + x]) + buf[x] |= BIT(i); + + /* Write data */ + gpio_set_value(par->gpio.dc, 1); + ret = par->fbtftops.write(par, buf, xres); + if (ret < 0) { + dev_err(par->info->device, + "write failed and returned: %d\n", ret); + return ret; + } + } + + return 0; +} + +static struct fbtft_display display = { + .regwidth = 8, + .width = WIDTH, + .height = HEIGHT, + .txbuflen = WIDTH, + .gamma_num = 1, + .gamma_len = 1, + /* set default contrast to 0xcd = 80% */ + .gamma = "cd", + .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, "sinowealth,sh1106", &display); + +MODULE_ALIAS("spi:" DRVNAME); +MODULE_ALIAS("platform:" DRVNAME); +MODULE_ALIAS("spi:sh1106"); +MODULE_ALIAS("platform:sh1106"); + +MODULE_DESCRIPTION("SH1106 OLED Driver"); +MODULE_AUTHOR("Heiner Kallweit"); +MODULE_LICENSE("GPL"); |