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155 lines
4.2 KiB
Diff
155 lines
4.2 KiB
Diff
From dbce7b846300f8c8ffed1256b6201bb1590181b4 Mon Sep 17 00:00:00 2001
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From: Alan <Alan>
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Date: Sat, 20 May 2023 14:33:52 +0800
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Subject: Add: FB_TFT ST7796S driver
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---
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drivers/staging/fbtft/Kconfig | 10 +++
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drivers/staging/fbtft/Makefile | 1 +
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drivers/staging/fbtft/fb_st7796s.c | 100 +++++++++++++++++++++++++++++
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3 files changed, 111 insertions(+)
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create mode 100644 drivers/staging/fbtft/fb_st7796s.c
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diff --git a/drivers/staging/fbtft/Kconfig b/drivers/staging/fbtft/Kconfig
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index 5dda3c65a38e..8e491c9f6c0e 100644
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--- a/drivers/staging/fbtft/Kconfig
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+++ b/drivers/staging/fbtft/Kconfig
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@@ -172,6 +172,16 @@ config FB_TFT_ST7789V
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Say Y if you have such a display that utilizes this controller.
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+config FB_TFT_ST7796S
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+ tristate "FB driver for the ST7796S LCD Controller"
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+ depends on FB_TFT
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+ help
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+ This enables generic framebuffer support for the Sitronix ST7796S
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+ display controller. The controller is intended for small color
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+ displays with a resolution of up to 480x320 pixels.
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+
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+ Say Y if you have such a display that utilizes this controller.
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+
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config FB_TFT_TINYLCD
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tristate "FB driver for tinylcd.com display"
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depends on FB_TFT
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diff --git a/drivers/staging/fbtft/Makefile b/drivers/staging/fbtft/Makefile
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index e9cdf0f0a7da..7b2098b8a1bd 100644
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--- a/drivers/staging/fbtft/Makefile
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+++ b/drivers/staging/fbtft/Makefile
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@@ -31,6 +31,7 @@ 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_ST7789V) += fb_st7789v.o
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+obj-$(CONFIG_FB_TFT_ST7796S) += fb_st7796s.o
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obj-$(CONFIG_FB_TFT_TINYLCD) += fb_tinylcd.o
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obj-$(CONFIG_FB_TFT_TLS8204) += fb_tls8204.o
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obj-$(CONFIG_FB_TFT_UC1611) += fb_uc1611.o
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diff --git a/drivers/staging/fbtft/fb_st7796s.c b/drivers/staging/fbtft/fb_st7796s.c
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new file mode 100644
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index 000000000000..cad489cef595
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--- /dev/null
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+++ b/drivers/staging/fbtft/fb_st7796s.c
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@@ -0,0 +1,100 @@
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+// SPDX-License-Identifier: GPL-2.0+
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+/*
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+ * FB driver for the ST7796S LCD Controller
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+ *
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+ * Copyright (c) 2023 Alan Ma
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+ * Copyright (c) 2014 Petr Olivka
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+ * Copyright (c) 2013 Noralf Tronnes
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+ */
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+
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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/delay.h>
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+#include <video/mipi_display.h>
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+
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+#include "fbtft.h"
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+
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+#define DRVNAME "fb_st7796s"
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+#define WIDTH 480
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+#define HEIGHT 320
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+
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+static const s16 default_init_sequence[] = {
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+ -1, 0xC0, 0x0C, 0x02,
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+ -1, 0xC1, 0x44,
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+ -1, 0xC5, 0x00, 0x16, 0x80,
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+ -1, 0x36, 0x28,
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+ /* Interface Mode Control */
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+ -1, 0x3A, 0x55,
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+ -1, 0XB0, 0x00,
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+ /* Frame rate 70HZ */
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+ -1, 0xB1, 0xB0,
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+ -1, 0xB4, 0x02,
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+ /* RGB/MCU Interface Control */
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+ -1, 0xB6, 0x02, 0x02,
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+ -1, 0xE9, 0x00,
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+ -1, 0XF7, 0xA9, 0x51, 0x2C, 0x82,
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+ /* SLP_OUT - Sleep out */
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+ -1, MIPI_DCS_EXIT_SLEEP_MODE,
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+ -2, 50,
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+ /* DISP_ON */
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+ -1, MIPI_DCS_SET_DISPLAY_ON,
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+ -3
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+};
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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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+ write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS,
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+ xs >> 8, xs & 0xff, xe >> 8, xe & 0xff);
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+
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+ write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS,
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+ ys >> 8, ys & 0xff, ye >> 8, ye & 0xff);
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+
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+ write_reg(par, MIPI_DCS_WRITE_MEMORY_START);
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+}
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+
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+static int set_var(struct fbtft_par *par)
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+{
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+ switch (par->info->var.rotate) {
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+ case 270:
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+ write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
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+ 0x80 | (par->bgr << 3));
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+ break;
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+ case 180:
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+ write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
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+ 0xE0 | (par->bgr << 3));
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+ break;
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+ case 90:
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+ write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
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+ 0x40 | (par->bgr << 3));
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+ break;
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+ default:
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+ write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
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+ 0x20 | (par->bgr << 3));
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+ break;
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+ }
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+
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+ return 0;
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+}
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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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+ .init_sequence = default_init_sequence,
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+ .fbtftops = {
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+ .set_addr_win = set_addr_win,
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+ .set_var = set_var,
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+ },
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+};
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+
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+FBTFT_REGISTER_DRIVER(DRVNAME, "sitronix,st7796s", &display);
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+
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+MODULE_ALIAS("spi:" DRVNAME);
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+MODULE_ALIAS("platform:" DRVNAME);
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+MODULE_ALIAS("spi:st7796s");
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+MODULE_ALIAS("platform:st7796s");
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+
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+MODULE_DESCRIPTION("FB driver for the ST7796S LCD Controller");
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+MODULE_AUTHOR("Alan Ma");
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+MODULE_LICENSE("GPL");
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--
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2.35.3
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