staging: fbtft: add fb_uc1701 driver

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>
Signed-off-by: Noralf Tronnes <notro@tronnes.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/fbtft/Kconfig b/drivers/staging/fbtft/Kconfig
index 73c181c..fb3f4df 100644 (file)
--- 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 (file)
--- 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 (file)
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");