staging: fbtft: add fb_ili9340 driver

This commit adds the fb_ili9340 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 24b9d91..6295acf 100644 (file)
--- a/drivers/staging/fbtft/Kconfig
+++ b/drivers/staging/fbtft/Kconfig
@@ -49,3 +49,9 @@ config FB_TFT_ILI9325
        depends on FB_TFT
        help
          Generic Framebuffer support for ILI9325
+
+config FB_TFT_ILI9340
+       tristate "FB driver for the ILI9340 LCD Controller"
+       depends on FB_TFT
+       help
+         Generic Framebuffer support for ILI9340

diff --git a/drivers/staging/fbtft/Makefile b/drivers/staging/fbtft/Makefile
index 09d4697..aa65da8 100644 (file)
--- a/drivers/staging/fbtft/Makefile
+++ b/drivers/staging/fbtft/Makefile
@@ -10,3 +10,4 @@ obj-$(CONFIG_FB_TFT_HX8347D)     += fb_hx8347d.o
 obj-$(CONFIG_FB_TFT_HX8353D)     += fb_hx8353d.o
 obj-$(CONFIG_FB_TFT_ILI9320)     += fb_ili9320.o
 obj-$(CONFIG_FB_TFT_ILI9325)     += fb_ili9325.o
+obj-$(CONFIG_FB_TFT_ILI9340)     += fb_ili9340.o

diff --git a/drivers/staging/fbtft/fb_ili9340.c b/drivers/staging/fbtft/fb_ili9340.c
new file mode 100644 (file)
index 0000000..985687d
--- /dev/null
+++ b/drivers/staging/fbtft/fb_ili9340.c
@@ -0,0 +1,163 @@
+/*
+ * FB driver for the ILI9340 LCD Controller
+ *
+ * Copyright (C) 2013 Noralf Tronnes
+ *
+ * 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_ili9340"
+#define WIDTH          240
+#define HEIGHT         320
+
+
+/* Init sequence taken from: Arduino Library for the Adafruit 2.2" display */
+static int init_display(struct fbtft_par *par)
+{
+       fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
+
+       par->fbtftops.reset(par);
+
+       write_reg(par, 0xEF, 0x03, 0x80, 0x02);
+       write_reg(par, 0xCF, 0x00 , 0XC1 , 0X30);
+       write_reg(par, 0xED, 0x64 , 0x03 , 0X12 , 0X81);
+       write_reg(par, 0xE8, 0x85 , 0x00 , 0x78);
+       write_reg(par, 0xCB, 0x39 , 0x2C , 0x00 , 0x34 , 0x02);
+       write_reg(par, 0xF7, 0x20);
+       write_reg(par, 0xEA, 0x00 , 0x00);
+
+       /* Power Control 1 */
+       write_reg(par, 0xC0, 0x23);
+
+       /* Power Control 2 */
+       write_reg(par, 0xC1, 0x10);
+
+       /* VCOM Control 1 */
+       write_reg(par, 0xC5, 0x3e, 0x28);
+
+       /* VCOM Control 2 */
+       write_reg(par, 0xC7, 0x86);
+
+       /* COLMOD: Pixel Format Set */
+       /* 16 bits/pixel */
+       write_reg(par, 0x3A, 0x55);
+
+       /* Frame Rate Control */
+       /* Division ratio = fosc, Frame Rate = 79Hz */
+       write_reg(par, 0xB1, 0x00, 0x18);
+
+       /* Display Function Control */
+       write_reg(par, 0xB6, 0x08, 0x82, 0x27);
+
+       /* Gamma Function Disable */
+       write_reg(par, 0xF2, 0x00);
+
+       /* Gamma curve selected  */
+       write_reg(par, 0x26, 0x01);
+
+       /* Positive Gamma Correction */
+       write_reg(par, 0xE0,
+               0x0F, 0x31, 0x2B, 0x0C, 0x0E, 0x08, 0x4E, 0xF1,
+               0x37, 0x07, 0x10, 0x03, 0x0E, 0x09, 0x00);
+
+       /* Negative Gamma Correction */
+       write_reg(par, 0xE1,
+               0x00, 0x0E, 0x14, 0x03, 0x11, 0x07, 0x31, 0xC1,
+               0x48, 0x08, 0x0F, 0x0C, 0x31, 0x36, 0x0F);
+
+       /* Sleep OUT */
+       write_reg(par, 0x11);
+
+       mdelay(120);
+
+       /* Display ON */
+       write_reg(par, 0x29);
+
+       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);
+
+       /* Column address */
+       write_reg(par, 0x2A, xs >> 8, xs & 0xFF, xe >> 8, xe & 0xFF);
+
+       /* Row adress */
+       write_reg(par, 0x2B, ys >> 8, ys & 0xFF, ye >> 8, ye & 0xFF);
+
+       /* Memory write */
+       write_reg(par, 0x2C);
+}
+
+#define ILI9340_MADCTL_MV  0x20
+#define ILI9340_MADCTL_MX  0x40
+#define ILI9340_MADCTL_MY  0x80
+static int set_var(struct fbtft_par *par)
+{
+       u8 val;
+
+       fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
+
+       switch (par->info->var.rotate) {
+       case 270:
+               val = ILI9340_MADCTL_MV;
+               break;
+       case 180:
+               val = ILI9340_MADCTL_MY;
+               break;
+       case 90:
+               val = ILI9340_MADCTL_MV | ILI9340_MADCTL_MY | ILI9340_MADCTL_MX;
+               break;
+       default:
+               val = ILI9340_MADCTL_MX;
+               break;
+       }
+       /* Memory Access Control  */
+       write_reg(par, 0x36, val | (par->bgr << 3));
+
+       return 0;
+}
+
+
+static struct fbtft_display display = {
+       .regwidth = 8,
+       .width = WIDTH,
+       .height = HEIGHT,
+       .fbtftops = {
+               .init_display = init_display,
+               .set_addr_win = set_addr_win,
+               .set_var = set_var,
+       },
+};
+FBTFT_REGISTER_DRIVER(DRVNAME, "ilitek,ili9340", &display);
+
+MODULE_ALIAS("spi:" DRVNAME);
+MODULE_ALIAS("platform:" DRVNAME);
+MODULE_ALIAS("spi:ili9340");
+MODULE_ALIAS("platform:ili9340");
+
+MODULE_DESCRIPTION("FB driver for the ILI9340 LCD Controller");
+MODULE_AUTHOR("Noralf Tronnes");
+MODULE_LICENSE("GPL");