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List: linux-driver-devel
Subject: [PATCH 24/29] staging: fbtft: add fb_uc1701 driver
From: Thomas Petazzoni <thomas.petazzoni () free-electrons ! com>
Date: 2014-12-31 9:11:32
Message-ID: 1420017097-12461-25-git-send-email-thomas.petazzoni () free-electrons ! com
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This commit adds the fb_uc1701 driver from the fbtft project at
https://github.com/notro/fbtft.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
---
drivers/staging/fbtft/Kconfig | 6 ++
drivers/staging/fbtft/Makefile | 1 +
drivers/staging/fbtft/fb_uc1701.c | 210 ++++++++++++++++++++++++++++++++++++++
3 files changed, 217 insertions(+)
create mode 100644 drivers/staging/fbtft/fb_uc1701.c
diff --git a/drivers/staging/fbtft/Kconfig b/drivers/staging/fbtft/Kconfig
index 73c181c..fb3f4df 100644
--- a/drivers/staging/fbtft/Kconfig
+++ b/drivers/staging/fbtft/Kconfig
@@ -139,3 +139,9 @@ config FB_TFT_TLS8204
depends on FB_TFT
help
Generic Framebuffer support for TLS8204
+
+config FB_TFT_UC1701
+ tristate "FB driver for the UC1701 LCD Controller"
+ depends on FB_TFT
+ help
+ Generic Framebuffer support for UC1701
diff --git a/drivers/staging/fbtft/Makefile b/drivers/staging/fbtft/Makefile
index 5fa20f0..732b219 100644
--- a/drivers/staging/fbtft/Makefile
+++ b/drivers/staging/fbtft/Makefile
@@ -25,3 +25,4 @@ obj-$(CONFIG_FB_TFT_SSD1351) += fb_ssd1351.o
obj-$(CONFIG_FB_TFT_ST7735R) += fb_st7735r.o
obj-$(CONFIG_FB_TFT_TINYLCD) += fb_tinylcd.o
obj-$(CONFIG_FB_TFT_TLS8204) += fb_tls8204.o
+obj-$(CONFIG_FB_TFT_UC1701) += fb_uc1701.o
diff --git a/drivers/staging/fbtft/fb_uc1701.c b/drivers/staging/fbtft/fb_uc1701.c
new file mode 100644
index 0000000..d70ac52
--- /dev/null
+++ b/drivers/staging/fbtft/fb_uc1701.c
@@ -0,0 +1,210 @@
+/*
+ * FB driver for the UC1701 LCD Controller
+ *
+ * The display is monochrome and the video memory is RGB565.
+ * Any pixel value except 0 turns the pixel on.
+ *
+ * Copyright (C) 2014 Juergen Holzmann
+ *
+ * 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/spi/spi.h>
+#include <linux/delay.h>
+
+#include "fbtft.h"
+
+#define DRVNAME "fb_uc1701"
+#define WIDTH 102
+#define HEIGHT 64
+#define PAGES (HEIGHT/8)
+
+/* 1: Display on/off */
+#define LCD_DISPLAY_ENABLE 0xAE
+/* 2: display start line set */
+#define LCD_START_LINE 0x40
+/* 3: Page address set (lower 4 bits select one of the pages) */
+#define LCD_PAGE_ADDRESS 0xB0
+/* 4: column address */
+#define LCD_COL_ADDRESS 0x10
+/* 8: select orientation */
+#define LCD_BOTTOMVIEW 0xA0
+/* 9: inverted display */
+#define LCD_DISPLAY_INVERT 0xA6
+/* 10: show memory content or switch all pixels on */
+#define LCD_ALL_PIXEL 0xA4
+/* 11: lcd bias set */
+#define LCD_BIAS 0xA2
+/* 14: Reset Controller */
+#define LCD_RESET_CMD 0xE2
+/* 15: output mode select (turns display upside-down) */
+#define LCD_SCAN_DIR 0xC0
+/* 16: power control set */
+#define LCD_POWER_CONTROL 0x28
+/* 17: voltage regulator resistor ratio set */
+#define LCD_VOLTAGE 0x20
+/* 18: Volume mode set */
+#define LCD_VOLUME_MODE 0x81
+/* 22: NOP command */
+#define LCD_NO_OP 0xE3
+/* 25: advanced program control */
+#define LCD_ADV_PROG_CTRL 0xFA
+/* 25: advanced program control2 */
+#define LCD_ADV_PROG_CTRL2 0x10
+#define LCD_TEMPCOMP_HIGH 0x80
+/* column offset for normal orientation */
+#define SHIFT_ADDR_NORMAL 0
+/* column offset for bottom view orientation */
+#define SHIFT_ADDR_TOPVIEW 30
+
+
+static int init_display(struct fbtft_par *par)
+{
+ fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
+
+ par->fbtftops.reset(par);
+
+ /* softreset of LCD */
+ write_reg(par, LCD_RESET_CMD);
+ mdelay(10);
+
+ /* set startpoint */
+ /* LCD_START_LINE | (pos & 0x3F) */
+ write_reg(par, LCD_START_LINE);
+
+ /* select orientation BOTTOMVIEW */
+ write_reg(par, LCD_BOTTOMVIEW | 1);
+ /* output mode select (turns display upside-down) */
+ write_reg(par, LCD_SCAN_DIR | 0x00);
+
+ /* Normal Pixel mode */
+ write_reg(par, LCD_ALL_PIXEL | 0);
+
+ /* positive display */
+ write_reg(par, LCD_DISPLAY_INVERT | 0);
+
+ /* bias 1/9 */
+ write_reg(par, LCD_BIAS | 0);
+
+ /* power control mode: all features on */
+ /* LCD_POWER_CONTROL | (val&0x07) */
+ write_reg(par, LCD_POWER_CONTROL | 0x07);
+
+ /* set voltage regulator R/R */
+ /* LCD_VOLTAGE | (val&0x07) */
+ write_reg(par, LCD_VOLTAGE | 0x07);
+
+ /* volume mode set */
+ /* LCD_VOLUME_MODE,val&0x3f,LCD_NO_OP */
+ write_reg(par, LCD_VOLUME_MODE);
+ /* LCD_VOLUME_MODE,val&0x3f,LCD_NO_OP */
+ write_reg(par, 0x09);
+ /* ???? */
+ /* LCD_VOLUME_MODE,val&0x3f,LCD_NO_OP */
+ write_reg(par, LCD_NO_OP);
+
+ /* advanced program control */
+ write_reg(par, LCD_ADV_PROG_CTRL);
+ write_reg(par, LCD_ADV_PROG_CTRL2|LCD_TEMPCOMP_HIGH);
+
+ /* enable display */
+ write_reg(par, LCD_DISPLAY_ENABLE | 1);
+
+ 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);
+
+ /* goto address */
+ /* LCD_PAGE_ADDRESS | ((page) & 0x1F),
+ (((col)+SHIFT_ADDR_NORMAL) & 0x0F),
+ LCD_COL_ADDRESS | ((((col)+SHIFT_ADDR_NORMAL)>>4) & 0x0F) */
+ write_reg(par, LCD_PAGE_ADDRESS);
+ /* LCD_PAGE_ADDRESS | ((page) & 0x1F),
+ (((col)+SHIFT_ADDR_NORMAL) & 0x0F),
+ LCD_COL_ADDRESS | ((((col)+SHIFT_ADDR_NORMAL)>>4) & 0x0F) */
+ write_reg(par, 0x00);
+ /* LCD_PAGE_ADDRESS | ((page) & 0x1F),
+ (((col)+SHIFT_ADDR_NORMAL) & 0x0F),
+ LCD_COL_ADDRESS | ((((col)+SHIFT_ADDR_NORMAL)>>4) & 0x0F) */
+ write_reg(par, LCD_COL_ADDRESS);
+}
+
+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 (y = 0; y < PAGES; y++) {
+ buf = par->txbuf.buf;
+ for (x = 0; x < WIDTH; x++) {
+ *buf = 0x00;
+ for (i = 0; i < 8; i++)
+ *buf |= (vmem16[((y*8*WIDTH)+(i*WIDTH))+x] ? 1 : 0) << i;
+ buf++;
+ }
+ /* LCD_PAGE_ADDRESS | ((page) & 0x1F),
+ (((col)+SHIFT_ADDR_NORMAL) & 0x0F),
+ LCD_COL_ADDRESS | ((((col)+SHIFT_ADDR_NORMAL)>>4) & 0x0F) */
+ write_reg(par, LCD_PAGE_ADDRESS|(u8)y);
+ /* LCD_PAGE_ADDRESS | ((page) & 0x1F),
+ (((col)+SHIFT_ADDR_NORMAL) & 0x0F),
+ LCD_COL_ADDRESS | ((((col)+SHIFT_ADDR_NORMAL)>>4) & 0x0F) */
+ write_reg(par, 0x00);
+ /* LCD_PAGE_ADDRESS | ((page) & 0x1F),
+ (((col)+SHIFT_ADDR_NORMAL) & 0x0F),
+ LCD_COL_ADDRESS | ((((col)+SHIFT_ADDR_NORMAL)>>4) & 0x0F) */
+ write_reg(par, LCD_COL_ADDRESS);
+ gpio_set_value(par->gpio.dc, 1);
+ ret = par->fbtftops.write(par, par->txbuf.buf, WIDTH);
+ gpio_set_value(par->gpio.dc, 0);
+ }
+
+ 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,
+ .fbtftops = {
+ .init_display = init_display,
+ .set_addr_win = set_addr_win,
+ .write_vmem = write_vmem,
+ },
+ .backlight = 1,
+};
+FBTFT_REGISTER_DRIVER(DRVNAME, "UltraChip,uc1701", &display);
+
+MODULE_ALIAS("spi:" DRVNAME);
+MODULE_ALIAS("spi:uc1701");
+
+MODULE_DESCRIPTION("FB driver for the UC1701 LCD Controller");
+MODULE_AUTHOR("Juergen Holzmann");
+MODULE_LICENSE("GPL");
--
2.1.0
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