staging: fbtft: add fb_ili9341 driver

This commit adds the fb_ili9341 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 6295acf..ee09e9d 100644 (file)
--- a/drivers/staging/fbtft/Kconfig
+++ b/drivers/staging/fbtft/Kconfig
@@ -55,3 +55,9 @@ config FB_TFT_ILI9340
        depends on FB_TFT
        help
          Generic Framebuffer support for ILI9340
+
+config FB_TFT_ILI9341
+       tristate "FB driver for the ILI9341 LCD Controller"
+       depends on FB_TFT
+       help
+         Generic Framebuffer support for ILI9341

diff --git a/drivers/staging/fbtft/Makefile b/drivers/staging/fbtft/Makefile
index aa65da8..a83a685 100644 (file)
--- a/drivers/staging/fbtft/Makefile
+++ b/drivers/staging/fbtft/Makefile
@@ -11,3 +11,4 @@ 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
+obj-$(CONFIG_FB_TFT_ILI9341)     += fb_ili9341.o

diff --git a/drivers/staging/fbtft/fb_ili9341.c b/drivers/staging/fbtft/fb_ili9341.c
new file mode 100644 (file)
index 0000000..225b2d8
--- /dev/null
+++ b/drivers/staging/fbtft/fb_ili9341.c
@@ -0,0 +1,179 @@
+/*
+ * FB driver for the ILI9341 LCD display controller
+ *
+ * This display uses 9-bit SPI: Data/Command bit + 8 data bits
+ * For platforms that doesn't support 9-bit, the driver is capable
+ * of emulating this using 8-bit transfer.
+ * This is done by transfering eight 9-bit words in 9 bytes.
+ *
+ * Copyright (C) 2013 Christian Vogelgsang
+ * Based on adafruit22fb.c by 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/delay.h>
+
+#include "fbtft.h"
+
+#define DRVNAME                "fb_ili9341"
+#define WIDTH          240
+#define HEIGHT         320
+#define TXBUFLEN       (4 * PAGE_SIZE)
+#define DEFAULT_GAMMA  "1F 1A 18 0A 0F 06 45 87 32 0A 07 02 07 05 00\n" \
+                       "00 25 27 05 10 09 3A 78 4D 05 18 0D 38 3A 1F"
+
+
+static int init_display(struct fbtft_par *par)
+{
+       fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
+
+       par->fbtftops.reset(par);
+
+       /* startup sequence for MI0283QT-9A */
+       write_reg(par, 0x01); /* software reset */
+       mdelay(5);
+       write_reg(par, 0x28); /* display off */
+       /* --------------------------------------------------------- */
+       write_reg(par, 0xCF, 0x00, 0x83, 0x30);
+       write_reg(par, 0xED, 0x64, 0x03, 0x12, 0x81);
+       write_reg(par, 0xE8, 0x85, 0x01, 0x79);
+       write_reg(par, 0xCB, 0x39, 0X2C, 0x00, 0x34, 0x02);
+       write_reg(par, 0xF7, 0x20);
+       write_reg(par, 0xEA, 0x00, 0x00);
+       /* ------------power control-------------------------------- */
+       write_reg(par, 0xC0, 0x26);
+       write_reg(par, 0xC1, 0x11);
+       /* ------------VCOM --------- */
+       write_reg(par, 0xC5, 0x35, 0x3E);
+       write_reg(par, 0xC7, 0xBE);
+       /* ------------memory access control------------------------ */
+       write_reg(par, 0x3A, 0x55); /* 16bit pixel */
+       /* ------------frame rate----------------------------------- */
+       write_reg(par, 0xB1, 0x00, 0x1B);
+       /* ------------Gamma---------------------------------------- */
+       /* write_reg(par, 0xF2, 0x08); */ /* Gamma Function Disable */
+       write_reg(par, 0x26, 0x01);
+       /* ------------display-------------------------------------- */
+       write_reg(par, 0xB7, 0x07); /* entry mode set */
+       write_reg(par, 0xB6, 0x0A, 0x82, 0x27, 0x00);
+       write_reg(par, 0x11); /* sleep out */
+       mdelay(100);
+       write_reg(par, 0x29); /* display on */
+       mdelay(20);
+
+       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 set */
+       write_reg(par, 0x2A,
+               (xs >> 8) & 0xFF, xs & 0xFF, (xe >> 8) & 0xFF, xe & 0xFF);
+
+       /* Row adress set */
+       write_reg(par, 0x2B,
+               (ys >> 8) & 0xFF, ys & 0xFF, (ye >> 8) & 0xFF, ye & 0xFF);
+
+       /* Memory write */
+       write_reg(par, 0x2C);
+}
+
+#define MEM_Y   (7) /* MY row address order */
+#define MEM_X   (6) /* MX column address order */
+#define MEM_V   (5) /* MV row / column exchange */
+#define MEM_L   (4) /* ML vertical refresh order */
+#define MEM_H   (2) /* MH horizontal refresh order */
+#define MEM_BGR (3) /* RGB-BGR Order */
+static int set_var(struct fbtft_par *par)
+{
+       fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
+
+       switch (par->info->var.rotate) {
+       case 0:
+               write_reg(par, 0x36, (1 << MEM_X) | (par->bgr << MEM_BGR));
+               break;
+       case 270:
+               write_reg(par, 0x36,
+                       (1<<MEM_V) | (1 << MEM_L) | (par->bgr << MEM_BGR));
+               break;
+       case 180:
+               write_reg(par, 0x36, (1 << MEM_Y) | (par->bgr << MEM_BGR));
+               break;
+       case 90:
+               write_reg(par, 0x36, (1 << MEM_Y) | (1 << MEM_X) |
+                                    (1 << MEM_V) | (par->bgr << MEM_BGR));
+               break;
+       }
+
+       return 0;
+}
+
+/*
+  Gamma string format:
+    Positive: Par1 Par2 [...] Par15
+    Negative: Par1 Par2 [...] Par15
+*/
+#define CURVE(num, idx)  curves[num*par->gamma.num_values + idx]
+static int set_gamma(struct fbtft_par *par, unsigned long *curves)
+{
+       int i;
+
+       fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
+
+       for (i = 0; i < par->gamma.num_curves; i++)
+               write_reg(par, 0xE0 + i,
+                       CURVE(i, 0), CURVE(i, 1), CURVE(i, 2),
+                       CURVE(i, 3), CURVE(i, 4), CURVE(i, 5),
+                       CURVE(i, 6), CURVE(i, 7), CURVE(i, 8),
+                       CURVE(i, 9), CURVE(i, 10), CURVE(i, 11),
+                       CURVE(i, 12), CURVE(i, 13), CURVE(i, 14));
+
+       return 0;
+}
+#undef CURVE
+
+
+static struct fbtft_display display = {
+       .regwidth = 8,
+       .width = WIDTH,
+       .height = HEIGHT,
+       .txbuflen = TXBUFLEN,
+       .gamma_num = 2,
+       .gamma_len = 15,
+       .gamma = DEFAULT_GAMMA,
+       .fbtftops = {
+               .init_display = init_display,
+               .set_addr_win = set_addr_win,
+               .set_var = set_var,
+               .set_gamma = set_gamma,
+       },
+};
+FBTFT_REGISTER_DRIVER(DRVNAME, "ilitek,ili9341", &display);
+
+MODULE_ALIAS("spi:" DRVNAME);
+MODULE_ALIAS("platform:" DRVNAME);
+MODULE_ALIAS("spi:ili9341");
+MODULE_ALIAS("platform:ili9341");
+
+MODULE_DESCRIPTION("FB driver for the ILI9341 LCD display controller");
+MODULE_AUTHOR("Christian Vogelgsang");
+MODULE_LICENSE("GPL");