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Merge pull request raspberrypi#50 from asmecher/master
Add support for SSD1331
2 parents e207c4e + e4f01a8 commit 663a4b2

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‎Kconfig

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Original file line numberDiff line numberDiff line change
@@ -50,6 +50,12 @@ config FB_TFT_SSD1289
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help
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Framebuffer support for SSD1289
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config FB_TFT_SSD1331
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tristate "FB driver for the SSD1331 LCD Controller"
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depends on FB_TFT
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help
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Framebuffer support for SSD1331
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config FB_TFT_SSD1351
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tristate "FB driver for the SSD1351 LCD Controller"
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depends on FB_TFT

‎Makefile

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Original file line numberDiff line numberDiff line change
@@ -10,6 +10,7 @@ obj-$(CONFIG_FB_TFT_ILI9325) += fb_ili9325.o
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obj-$(CONFIG_FB_TFT_ILI9341) += fb_ili9341.o
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obj-$(CONFIG_FB_TFT_PCD8544) += fb_pcd8544.o
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obj-$(CONFIG_FB_TFT_SSD1289) += fb_ssd1289.o
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obj-$(CONFIG_FB_TFT_SSD1331) += fb_ssd1331.o
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obj-$(CONFIG_FB_TFT_SSD1351) += fb_ssd1351.o
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obj-$(CONFIG_FB_TFT_ST7735R) += fb_st7735r.o
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obj-$(CONFIG_FB_TFT_WATTEROTT) += fb_watterott.o

‎fb_ssd1331.c

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@@ -0,0 +1,203 @@
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/gpio.h>
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#include <linux/spi/spi.h>
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#include <linux/delay.h>
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#include "fbtft.h"
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#define DRVNAME "fb_ssd1331"
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#define WIDTH 96
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#define HEIGHT 64
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#define GAMMA_NUM 1
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#define GAMMA_LEN 63
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#define DEFAULT_GAMMA "0 2 2 2 2 2 2 2 " \
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"2 2 2 2 2 2 2 2 " \
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"2 2 2 2 2 2 2 2 " \
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"2 2 2 2 2 2 2 2 " \
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"2 2 2 2 2 2 2 2 " \
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"2 2 2 2 2 2 2 2 " \
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"2 2 2 2 2 2 2 2 " \
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"2 2 2 2 2 2 2" \
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static int init_display(struct fbtft_par *par)
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{
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fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
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par->fbtftops.reset(par);
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write_reg(par, 0xae); /* Display Off */
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write_reg(par, 0xa0, 0x70 | (par->bgr << 2)); /* Set Colour Depth */
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write_reg(par, 0x72); // RGB colour
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write_reg(par, 0xa1, 0x00); /* Set Display Start Line */
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write_reg(par, 0xa2, 0x00); /* Set Display Offset */
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write_reg(par, 0xa4); /* NORMALDISPLAY */
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write_reg(par, 0xa8, 0x3f); // Set multiplex
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write_reg(par, 0xad, 0x8e); // Set master
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// write_reg(par, 0xb0, 0x0b); // Set power mode
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write_reg(par, 0xb1, 0x31); // Precharge
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write_reg(par, 0xb3, 0xf0); // Clock div
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write_reg(par, 0x8a, 0x64); // Precharge A
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write_reg(par, 0x8b, 0x78); // Precharge B
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write_reg(par, 0x8c, 0x64); // Precharge C
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write_reg(par, 0xbb, 0x3a); // Precharge level
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write_reg(par, 0xbe, 0x3e); // vcomh
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write_reg(par, 0x87, 0x06); // Master current
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write_reg(par, 0x81, 0x91); // Contrast A
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write_reg(par, 0x82, 0x50); // Contrast B
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write_reg(par, 0x83, 0x7d); // Contrast C
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write_reg(par, 0xaf); /* Set Sleep Mode Display On */
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return 0;
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}
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static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
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{
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fbtft_par_dbg(DEBUG_SET_ADDR_WIN, par,
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"%s(xs=%d, ys=%d, xe=%d, ye=%d)\n", __func__, xs, ys, xe, ye);
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write_reg(par, 0x15, xs, xe);
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write_reg(par, 0x75, ys, ye);
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}
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static void write_reg8_bus8(struct fbtft_par *par, int len, ...)
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{
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va_list args;
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int i, ret;
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u8 *buf = (u8 *)par->buf;
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if (unlikely(par->debug & DEBUG_WRITE_REGISTER)) {
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va_start(args, len);
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for (i = 0; i < len; i++) {
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buf[i] = (u8)va_arg(args, unsigned int);
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}
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va_end(args);
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fbtft_par_dbg_hex(DEBUG_WRITE_REGISTER, par, par->info->device, u8, buf, len, "%s: ", __func__);
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}
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va_start(args, len);
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*buf = (u8)va_arg(args, unsigned int);
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if (par->gpio.dc != -1)
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gpio_set_value(par->gpio.dc, 0);
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ret = par->fbtftops.write(par, par->buf, sizeof(u8));
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if (ret < 0) {
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va_end(args);
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dev_err(par->info->device, "%s: write() failed and returned %d\n", __func__, ret);
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return;
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}
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len--;
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if (len) {
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i = len;
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while (i--) {
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*buf++ = (u8)va_arg(args, unsigned int);
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}
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ret = par->fbtftops.write(par, par->buf, len * (sizeof(u8)));
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if (ret < 0) {
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va_end(args);
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dev_err(par->info->device, "%s: write() failed and returned %d\n", __func__, ret);
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return;
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}
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}
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if (par->gpio.dc != -1)
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gpio_set_value(par->gpio.dc, 1);
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va_end(args);
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}
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/*
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Grayscale Lookup Table
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GS1 - GS63
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The driver Gamma curve contains the relative values between the entries
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in the Lookup table.
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From datasheet:
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8.8 Gray Scale Decoder
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there are total 180 Gamma Settings (Setting 0 to Setting 180)
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available for the Gray Scale table.
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The gray scale is defined in incremental way, with reference
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to the length of previous table entry:
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Setting of GS1 has to be >= 0
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Setting of GS2 has to be > Setting of GS1 +1
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Setting of GS3 has to be > Setting of GS2 +1
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:
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Setting of GS63 has to be > Setting of GS62 +1
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*/
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static int set_gamma(struct fbtft_par *par, unsigned long *curves)
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{
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unsigned long tmp[GAMMA_NUM * GAMMA_LEN];
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int i, acc = 0;
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fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
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for (i = 0; i < 63; i++) {
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if (i > 0 && curves[i] < 2) {
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dev_err(par->info->device,
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"Illegal value in Grayscale Lookup Table at index %d. " \
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"Must be greater than 1\n", i);
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return -EINVAL;
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}
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acc += curves[i];
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tmp[i] = acc;
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if (acc > 180) {
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dev_err(par->info->device,
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"Illegal value(s) in Grayscale Lookup Table. " \
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"At index=%d, the accumulated value has exceeded 180\n", i);
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return -EINVAL;
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}
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}
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write_reg(par, 0xB8,
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tmp[0], tmp[1], tmp[2], tmp[3], tmp[4], tmp[5], tmp[6], tmp[7],
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tmp[8], tmp[9], tmp[10], tmp[11], tmp[12], tmp[13], tmp[14], tmp[15],
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tmp[16], tmp[17], tmp[18], tmp[19], tmp[20], tmp[21], tmp[22], tmp[23],
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tmp[24], tmp[25], tmp[26], tmp[27], tmp[28], tmp[29], tmp[30], tmp[31],
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tmp[32], tmp[33], tmp[34], tmp[35], tmp[36], tmp[37], tmp[38], tmp[39],
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tmp[40], tmp[41], tmp[42], tmp[43], tmp[44], tmp[45], tmp[46], tmp[47],
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tmp[48], tmp[49], tmp[50], tmp[51], tmp[52], tmp[53], tmp[54], tmp[55],
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tmp[56], tmp[57], tmp[58], tmp[59], tmp[60], tmp[61], tmp[62]);
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return 0;
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}
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static int blank(struct fbtft_par *par, bool on)
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{
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fbtft_par_dbg(DEBUG_BLANK, par, "%s(blank=%s)\n",
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__func__, on ? "true" : "false");
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if (on)
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write_reg(par, 0xAE);
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else
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write_reg(par, 0xAF);
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return 0;
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}
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static struct fbtft_display display = {
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.regwidth = 8,
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.width = WIDTH,
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.height = HEIGHT,
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.gamma_num = GAMMA_NUM,
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.gamma_len = GAMMA_LEN,
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.gamma = DEFAULT_GAMMA,
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.fbtftops = {
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.write_register = write_reg8_bus8,
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.init_display = init_display,
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.set_addr_win = set_addr_win,
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.set_gamma = set_gamma,
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.blank = blank,
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},
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};
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FBTFT_REGISTER_DRIVER(DRVNAME, &display);
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MODULE_ALIAS("spi:" DRVNAME);
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MODULE_ALIAS("platform:" DRVNAME);
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MODULE_DESCRIPTION("SSD1331 OLED Driver");
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MODULE_AUTHOR("Alec Smecher (adapted from SSD1351 by James Davies)");
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MODULE_LICENSE("GPL");

‎fbtft_device.c

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Original file line numberDiff line numberDiff line change
@@ -260,6 +260,23 @@ static struct fbtft_device_display displays[] = {
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},
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}
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}
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}, {
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.name = "ssd1331",
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.spi = &(struct spi_board_info) {
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.modalias = "fb_ssd1331",
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.max_speed_hz = 20000000,
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.mode = SPI_MODE_3,
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.platform_data = &(struct fbtft_platform_data) {
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.display = {
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.buswidth = 8,
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},
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.gpios = (const struct fbtft_gpio []) {
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{ "reset", 24 },
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{ "dc", 25 },
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{},
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},
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}
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}
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}, {
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.name = "hy28a",
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.spi = &(struct spi_board_info) {

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