staging: fbtft: add fb_upd161704 driver

This commit adds the fb_upd161704 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 fb3f4df..886a48c 100644 (file)
--- a/drivers/staging/fbtft/Kconfig
+++ b/drivers/staging/fbtft/Kconfig
@@ -145,3 +145,9 @@ config FB_TFT_UC1701
        depends on FB_TFT
        help
          Generic Framebuffer support for UC1701
+
+config FB_TFT_UPD161704
+       tristate "FB driver for the uPD161704 LCD Controller"
+       depends on FB_TFT
+       help
+         Generic Framebuffer support for uPD161704

diff --git a/drivers/staging/fbtft/Makefile b/drivers/staging/fbtft/Makefile
index 732b219..dca2a45 100644 (file)
--- a/drivers/staging/fbtft/Makefile
+++ b/drivers/staging/fbtft/Makefile
@@ -26,3 +26,4 @@ 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
+obj-$(CONFIG_FB_TFT_UPD161704)   += fb_upd161704.o

diff --git a/drivers/staging/fbtft/fb_upd161704.c b/drivers/staging/fbtft/fb_upd161704.c
new file mode 100644 (file)
index 0000000..fff57b3
--- /dev/null
+++ b/drivers/staging/fbtft/fb_upd161704.c
@@ -0,0 +1,206 @@
+/*
+ * FB driver for the uPD161704 LCD Controller
+ *
+ * Copyright (C) 2014 Seong-Woo Kim
+ *
+ * Based on fb_ili9325.c by Noralf Tronnes
+ * Based on ili9325.c by Jeroen Domburg
+ * Init code from UTFT library by Henning Karlsen
+ *
+ * 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/delay.h>
+
+#include "fbtft.h"
+
+#define DRVNAME                "fb_upd161704"
+#define WIDTH          240
+#define HEIGHT         320
+#define BPP            16
+
+static int init_display(struct fbtft_par *par)
+{
+       fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
+
+       par->fbtftops.reset(par);
+
+       if (par->gpio.cs != -1)
+               gpio_set_value(par->gpio.cs, 0);  /* Activate chip */
+
+       /* Initialization sequence from Lib_UTFT */
+
+       /* register reset */
+       write_reg(par, 0x0003,0x0001);  /* Soft reset */
+
+       /* oscillator start */
+       write_reg(par, 0x003A,0x0001);  /*Oscillator 0: stop, 1: operation */
+       udelay(100);
+
+       /* y-setting */
+       write_reg(par, 0x0024,0x007B);  /* amplitude setting */
+       udelay(10);
+       write_reg(par, 0x0025,0x003B);  /* amplitude setting */
+       write_reg(par, 0x0026,0x0034);  /* amplitude setting */
+       udelay(10);
+       write_reg(par, 0x0027,0x0004);  /* amplitude setting */
+       write_reg(par, 0x0052,0x0025);  /* circuit setting 1 */
+       udelay(10);
+       write_reg(par, 0x0053,0x0033);  /* circuit setting 2 */
+       write_reg(par, 0x0061,0x001C);  /* adjustment V10 positive polarity */
+       udelay(10);
+       write_reg(par, 0x0062,0x002C);  /* adjustment V9 negative polarity */
+       write_reg(par, 0x0063,0x0022);  /* adjustment V34 positive polarity */
+       udelay(10);
+       write_reg(par, 0x0064,0x0027);  /* adjustment V31 negative polarity */
+       udelay(10);
+       write_reg(par, 0x0065,0x0014);  /* adjustment V61 negative polarity */
+       udelay(10);
+       write_reg(par, 0x0066,0x0010);  /* adjustment V61 negative polarity */
+       
+       /* Basical clock for 1 line (BASECOUNT[7:0]) number specified */
+       write_reg(par, 0x002E,0x002D);
+       
+       /* Power supply setting */
+       write_reg(par, 0x0019,0x0000);  /* DC/DC output setting */
+       udelay(200);
+       write_reg(par, 0x001A,0x1000);  /* DC/DC frequency setting */
+       write_reg(par, 0x001B,0x0023);  /* DC/DC rising setting */
+       write_reg(par, 0x001C,0x0C01);  /* Regulator voltage setting */
+       write_reg(par, 0x001D,0x0000);  /* Regulator current setting */
+       write_reg(par, 0x001E,0x0009);  /* VCOM output setting */
+       write_reg(par, 0x001F,0x0035);  /* VCOM amplitude setting */
+       write_reg(par, 0x0020,0x0015);  /* VCOMM cencter setting */
+       write_reg(par, 0x0018,0x1E7B);  /* DC/DC operation setting */
+
+       /* windows setting */
+       write_reg(par, 0x0008,0x0000);  /* Minimum X address */
+       write_reg(par, 0x0009,0x00EF);  /* Maximum X address */
+       write_reg(par, 0x000a,0x0000);  /* Minimum Y address */
+       write_reg(par, 0x000b,0x013F);  /* Maximum Y address */
+
+       /* LCD display area setting */
+       write_reg(par, 0x0029,0x0000);  /* [LCDSIZE]  X MIN. size set */
+       write_reg(par, 0x002A,0x0000);  /* [LCDSIZE]  Y MIN. size set */
+       write_reg(par, 0x002B,0x00EF);  /* [LCDSIZE]  X MAX. size set */
+       write_reg(par, 0x002C,0x013F);  /* [LCDSIZE]  Y MAX. size set */
+
+       /* Gate scan setting */
+       write_reg(par, 0x0032,0x0002);
+       
+       /* n line inversion line number */
+       write_reg(par, 0x0033,0x0000);
+
+       /* Line inversion/frame inversion/interlace setting */
+       write_reg(par, 0x0037,0x0000);
+       
+       /* Gate scan operation setting register */
+       write_reg(par, 0x003B,0x0001);
+       
+       /* Color mode */
+       /*GS = 0: 260-k color (64 gray scale), GS = 1: 8 color (2 gray scale) */
+       write_reg(par, 0x0004,0x0000);
+
+       /* RAM control register */
+       write_reg(par, 0x0005,0x0000);  /*Window access 00:Normal, 10:Window */
+
+       /* Display setting register 2 */
+       write_reg(par, 0x0001,0x0000);
+
+       /* display setting */
+       write_reg(par, 0x0000,0x0000);  /* display on */
+
+       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);
+       switch (par->info->var.rotate) {
+       /* R20h = Horizontal GRAM Start Address */
+       /* R21h = Vertical GRAM Start Address */
+       case 0:
+               write_reg(par, 0x0006, xs);
+               write_reg(par, 0x0007, ys);
+               break;
+       case 180:
+               write_reg(par, 0x0006, WIDTH - 1 - xs);
+               write_reg(par, 0x0007, HEIGHT - 1 - ys);
+               break;
+       case 270:
+               write_reg(par, 0x0006, WIDTH - 1 - ys);
+               write_reg(par, 0x0007, xs);
+               break;
+       case 90:
+               write_reg(par, 0x0006, ys);
+               write_reg(par, 0x0007, HEIGHT - 1 - xs);
+               break;
+       }
+
+       write_reg(par, 0x0e); /* Write Data to GRAM */
+}
+
+static int set_var(struct fbtft_par *par)
+{
+       fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
+
+       switch (par->info->var.rotate) {
+       /* AM: GRAM update direction */
+       case 0:
+               write_reg(par, 0x01, 0x0000);
+               write_reg(par, 0x05, 0x0000);
+               break;
+       case 180:
+               write_reg(par, 0x01, 0x00C0);
+               write_reg(par, 0x05, 0x0000);
+               break;
+       case 270:
+               write_reg(par, 0x01, 0x0080);
+               write_reg(par, 0x05, 0x0001);
+               break;
+       case 90:
+               write_reg(par, 0x01, 0x0040);
+               write_reg(par, 0x05, 0x0001);
+               break;
+       }
+
+       return 0;
+}
+
+static struct fbtft_display display = {
+       .regwidth = 16,
+       .width = WIDTH,
+       .height = HEIGHT,
+       .fbtftops = {
+               .init_display = init_display,
+               .set_addr_win = set_addr_win,
+               .set_var = set_var,
+       },
+};
+FBTFT_REGISTER_DRIVER(DRVNAME, "nec,upd161704", &display);
+
+MODULE_ALIAS("spi:" DRVNAME);
+MODULE_ALIAS("platform:" DRVNAME);
+MODULE_ALIAS("spi:upd161704");
+MODULE_ALIAS("platform:upd161704");
+
+MODULE_DESCRIPTION("FB driver for the uPD161704 LCD Controller");
+MODULE_AUTHOR("Seong-Woo Kim");
+MODULE_LICENSE("GPL");