That patch adds support for SSD1325 controller.
That is 4bpp grayscale OLED display controller present in several
displays eq: Winstar WEX012864
Signed-off-by: Alexey Mednyy <swexru@xxxxxxxxx>
---
drivers/staging/fbtft/Kconfig | 6 ++
drivers/staging/fbtft/Makefile | 1 +
drivers/staging/fbtft/fb_ssd1325.c | 205 +++++++++++++++++++++++++++++++++++++
3 files changed, 212 insertions(+)
create mode 100644 drivers/staging/fbtft/fb_ssd1325.c
diff --git a/drivers/staging/fbtft/Kconfig b/drivers/staging/fbtft/Kconfig
index 0bfc776..6f5e824 100644
--- a/drivers/staging/fbtft/Kconfig
+++ b/drivers/staging/fbtft/Kconfig
@@ -129,6 +129,12 @@ config FB_TFT_SSD1306
help
Framebuffer support for SSD1306
+config FB_TFT_SSD1325
+ tristate "FB driver for the SSD1325 OLED Controller"
+ depends on FB_TFT
+ help
+ Framebuffer support for SSD1305
+
config FB_TFT_SSD1331
tristate "FB driver for the SSD1331 LCD Controller"
depends on FB_TFT
diff --git a/drivers/staging/fbtft/Makefile b/drivers/staging/fbtft/Makefile
index 1ddc764..2725ea9 100644
--- a/drivers/staging/fbtft/Makefile
+++ b/drivers/staging/fbtft/Makefile
@@ -23,6 +23,7 @@ obj-$(CONFIG_FB_TFT_S6D1121) += fb_s6d1121.o
obj-$(CONFIG_FB_TFT_SSD1289) += fb_ssd1289.o
obj-$(CONFIG_FB_TFT_SSD1305) += fb_ssd1305.o
obj-$(CONFIG_FB_TFT_SSD1306) += fb_ssd1306.o
+obj-$(CONFIG_FB_TFT_SSD1305) += fb_ssd1325.o
obj-$(CONFIG_FB_TFT_SSD1331) += fb_ssd1331.o
obj-$(CONFIG_FB_TFT_SSD1351) += fb_ssd1351.o
obj-$(CONFIG_FB_TFT_ST7735R) += fb_st7735r.o
diff --git a/drivers/staging/fbtft/fb_ssd1325.c b/drivers/staging/fbtft/fb_ssd1325.c
new file mode 100644
index 0000000..15078bf
--- /dev/null
+++ b/drivers/staging/fbtft/fb_ssd1325.c
@@ -0,0 +1,205 @@
+/*
+ * FB driver for the SSD1325 OLED Controller
+ *
+ * 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_ssd1325"
+
+#define WIDTH 128
+#define HEIGHT 64
+#define GAMMA_NUM 1
+#define GAMMA_LEN 15
+#define DEFAULT_GAMMA "7 1 1 1 1 2 2 3 3 4 4 5 5 6 6"
+
+/*
+ * 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)
+{
+ par->fbtftops.reset(par);
+
+ gpio_set_value(par->gpio.cs, 0);
+
+ write_reg(par, 0xb3);
+ write_reg(par, 0xf0);
+ write_reg(par, 0xae);
+ write_reg(par, 0xa1);
+ write_reg(par, 0x00);
+ write_reg(par, 0xa8);
+ write_reg(par, 0x3f);
+ write_reg(par, 0xa0);
+ write_reg(par, 0x45);
+ write_reg(par, 0xa2);
+ write_reg(par, 0x40);
+ write_reg(par, 0x75);
+ write_reg(par, 0x00);
+ write_reg(par, 0x3f);
+ write_reg(par, 0x15);
+ write_reg(par, 0x00);
+ write_reg(par, 0x7f);
+ write_reg(par, 0xa4);
+ write_reg(par, 0xaf);
+
+ return 0;
+}
+
+static uint8_t rgb565_to_g16(u16 pixel)
+{
+ u16 b = pixel & 0x1f;
+ u16 g = (pixel & (0x3f << 5)) >> 5;
+ u16 r = (pixel & (0x1f << (5 + 6))) >> (5 + 6);
+
+ pixel = (299 * r + 587 * g + 114 * b) / 195;
+ if (pixel > 255)
+ pixel = 255;
+ return (uint8_t)pixel / 16;
+}
+
+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);
+
+ write_reg(par, 0x75);
+ write_reg(par, 0x00);
+ write_reg(par, 0x3f);
+ write_reg(par, 0x15);
+ write_reg(par, 0x00);
+ write_reg(par, 0x7f);
+}
+
+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;
+}
+
+/*
+ * Grayscale Lookup Table
+ * GS1 - GS15
+ * The "Gamma curve" contains the relative values between the entries
+ * in the Lookup table.
+ *
+ * 0 = Setting of GS1 < Setting of GS2 < Setting of GS3.....<
+ * Setting of GS14 < Setting of GS15
+ */
+static int set_gamma(struct fbtft_par *par, unsigned long *curves)
+{
+ int i;
+
+ fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
+
+ for (i = 0; i < GAMMA_LEN; i++) {
+ if (i > 0 && curves[i] < 1) {
+ dev_err(par->info->device,
+ "Illegal value in Grayscale Lookup Table at index %d.\n"
+ "Must be greater than 0\n", i);
+ return -EINVAL;
+ }
+ if (curves[i] > 7) {
+ dev_err(par->info->device,
+ "Illegal value(s) in Grayscale Lookup Table.\n"
+ "At index=%d, the accumulated value has exceeded 7\n",
+ i);
+ return -EINVAL;
+ }
+ }
+ write_reg(par, 0xB8);
+ for (i = 0; i < 8; i++)
+ write_reg(par, (curves[i] & 0xFF));
+ return 0;
+}
+
+static int write_vmem(struct fbtft_par *par, size_t offset, size_t len)
+{
+ u16 *vmem16 = (u16 *)par->info->screen_buffer;
+ u8 *buf = par->txbuf.buf;
+ u8 n1;
+ u8 n2;
+ int y, x;
+ int ret;
+
+ for (x = 0; x < par->info->var.xres; x++) {
+ if (x % 2)
+ continue;
+ for (y = 0; y < par->info->var.yres; y++) {
+ n1 = rgb565_to_g16(vmem16[y * par->info->var.xres + x]);
+ n2 = rgb565_to_g16(vmem16
+ [y * par->info->var.xres + x + 1]);
+ *buf = (n1 << 4) | n2;
+ buf++;
+ }
+ }
+
+ gpio_set_value(par->gpio.dc, 1);
+
+ /* Write data */
+ ret = par->fbtftops.write(par, par->txbuf.buf,
+ par->info->var.xres * par->info->var.yres / 2);
+ 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,
+ .txbuflen = WIDTH * HEIGHT / 2,
+ .gamma_num = GAMMA_NUM,
+ .gamma_len = GAMMA_LEN,
+ .gamma = DEFAULT_GAMMA,
+ .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,ssd1325", &display);
+
+MODULE_ALIAS("spi:" DRVNAME);
+MODULE_ALIAS("platform:" DRVNAME);
+MODULE_ALIAS("spi:ssd1325");
+MODULE_ALIAS("platform:ssd1325");
+
+MODULE_DESCRIPTION("SSD1325 OLED Driver");
+MODULE_AUTHOR("Alexey Mednyy");
+MODULE_LICENSE("GPL");
--
2.5.0
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