staging: fbtft: add fb_ili9320 driver
authorThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Wed, 31 Dec 2014 09:11:15 +0000 (10:11 +0100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Sun, 18 Jan 2015 00:46:46 +0000 (16:46 -0800)
This commit adds the fb_ili9320 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>
drivers/staging/fbtft/Kconfig
drivers/staging/fbtft/Makefile
drivers/staging/fbtft/fb_ili9320.c [new file with mode: 0644]

index 015429b..eb57f19 100644 (file)
@@ -37,3 +37,9 @@ config FB_TFT_HX8353D
        depends on FB_TFT
        help
          Generic Framebuffer support for HX8353D
+
+config FB_TFT_ILI9320
+       tristate "FB driver for the ILI9320 LCD Controller"
+       depends on FB_TFT
+       help
+         Generic Framebuffer support for ILI9320
index 766e285..e101cb6 100644 (file)
@@ -8,3 +8,4 @@ obj-$(CONFIG_FB_TFT_BD663474)    += fb_bd663474.o
 obj-$(CONFIG_FB_TFT_HX8340BN)    += fb_hx8340bn.o
 obj-$(CONFIG_FB_TFT_HX8347D)     += fb_hx8347d.o
 obj-$(CONFIG_FB_TFT_HX8353D)     += fb_hx8353d.o
+obj-$(CONFIG_FB_TFT_ILI9320)     += fb_ili9320.o
diff --git a/drivers/staging/fbtft/fb_ili9320.c b/drivers/staging/fbtft/fb_ili9320.c
new file mode 100644 (file)
index 0000000..b26d893
--- /dev/null
@@ -0,0 +1,234 @@
+/*
+ * FB driver for the ILI9320 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/spi/spi.h>
+#include <linux/delay.h>
+
+#include "fbtft.h"
+
+#define DRVNAME                "fb_ili9320"
+#define WIDTH          240
+#define HEIGHT         320
+#define DEFAULT_GAMMA  "07 07 6 0 0 0 5 5 4 0\n" \
+                       "07 08 4 7 5 1 2 0 7 7"
+
+
+static unsigned read_devicecode(struct fbtft_par *par)
+{
+       int ret;
+       u8 rxbuf[8] = {0, };
+
+       write_reg(par, 0x0000);
+       ret = par->fbtftops.read(par, rxbuf, 4);
+       return (rxbuf[2] << 8) | rxbuf[3];
+}
+
+static int init_display(struct fbtft_par *par)
+{
+       unsigned devcode;
+       fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
+
+       par->fbtftops.reset(par);
+
+       devcode = read_devicecode(par);
+       fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "Device code: 0x%04X\n",
+               devcode);
+       if ((devcode != 0x0000) && (devcode != 0x9320))
+               dev_warn(par->info->device,
+                       "Unrecognized Device code: 0x%04X (expected 0x9320)\n",
+                       devcode);
+
+       /* Initialization sequence from ILI9320 Application Notes */
+
+       /* *********** Start Initial Sequence ********* */
+       write_reg(par, 0x00E5, 0x8000); /* Set the Vcore voltage and this setting is must. */
+       write_reg(par, 0x0000, 0x0001); /* Start internal OSC. */
+       write_reg(par, 0x0001, 0x0100); /* set SS and SM bit */
+       write_reg(par, 0x0002, 0x0700); /* set 1 line inversion */
+       write_reg(par, 0x0004, 0x0000); /* Resize register */
+       write_reg(par, 0x0008, 0x0202); /* set the back and front porch */
+       write_reg(par, 0x0009, 0x0000); /* set non-display area refresh cycle */
+       write_reg(par, 0x000A, 0x0000); /* FMARK function */
+       write_reg(par, 0x000C, 0x0000); /* RGB interface setting */
+       write_reg(par, 0x000D, 0x0000); /* Frame marker Position */
+       write_reg(par, 0x000F, 0x0000); /* RGB interface polarity */
+
+       /* ***********Power On sequence *************** */
+       write_reg(par, 0x0010, 0x0000); /* SAP, BT[3:0], AP, DSTB, SLP, STB */
+       write_reg(par, 0x0011, 0x0007); /* DC1[2:0], DC0[2:0], VC[2:0] */
+       write_reg(par, 0x0012, 0x0000); /* VREG1OUT voltage */
+       write_reg(par, 0x0013, 0x0000); /* VDV[4:0] for VCOM amplitude */
+       mdelay(200); /* Dis-charge capacitor power voltage */
+       write_reg(par, 0x0010, 0x17B0); /* SAP, BT[3:0], AP, DSTB, SLP, STB */
+       write_reg(par, 0x0011, 0x0031); /* R11h=0x0031 at VCI=3.3V DC1[2:0], DC0[2:0], VC[2:0] */
+       mdelay(50);
+       write_reg(par, 0x0012, 0x0138); /* R12h=0x0138 at VCI=3.3V VREG1OUT voltage */
+       mdelay(50);
+       write_reg(par, 0x0013, 0x1800); /* R13h=0x1800 at VCI=3.3V VDV[4:0] for VCOM amplitude */
+       write_reg(par, 0x0029, 0x0008); /* R29h=0x0008 at VCI=3.3V VCM[4:0] for VCOMH */
+       mdelay(50);
+       write_reg(par, 0x0020, 0x0000); /* GRAM horizontal Address */
+       write_reg(par, 0x0021, 0x0000); /* GRAM Vertical Address */
+
+       /* ------------------ Set GRAM area --------------- */
+       write_reg(par, 0x0050, 0x0000); /* Horizontal GRAM Start Address */
+       write_reg(par, 0x0051, 0x00EF); /* Horizontal GRAM End Address */
+       write_reg(par, 0x0052, 0x0000); /* Vertical GRAM Start Address */
+       write_reg(par, 0x0053, 0x013F); /* Vertical GRAM Start Address */
+       write_reg(par, 0x0060, 0x2700); /* Gate Scan Line */
+       write_reg(par, 0x0061, 0x0001); /* NDL,VLE, REV */
+       write_reg(par, 0x006A, 0x0000); /* set scrolling line */
+
+       /* -------------- Partial Display Control --------- */
+       write_reg(par, 0x0080, 0x0000);
+       write_reg(par, 0x0081, 0x0000);
+       write_reg(par, 0x0082, 0x0000);
+       write_reg(par, 0x0083, 0x0000);
+       write_reg(par, 0x0084, 0x0000);
+       write_reg(par, 0x0085, 0x0000);
+
+       /* -------------- Panel Control ------------------- */
+       write_reg(par, 0x0090, 0x0010);
+       write_reg(par, 0x0092, 0x0000);
+       write_reg(par, 0x0093, 0x0003);
+       write_reg(par, 0x0095, 0x0110);
+       write_reg(par, 0x0097, 0x0000);
+       write_reg(par, 0x0098, 0x0000);
+       write_reg(par, 0x0007, 0x0173); /* 262K color and 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, 0x0020, xs);
+               write_reg(par, 0x0021, ys);
+               break;
+       case 180:
+               write_reg(par, 0x0020, WIDTH - 1 - xs);
+               write_reg(par, 0x0021, HEIGHT - 1 - ys);
+               break;
+       case 270:
+               write_reg(par, 0x0020, WIDTH - 1 - ys);
+               write_reg(par, 0x0021, xs);
+               break;
+       case 90:
+               write_reg(par, 0x0020, ys);
+               write_reg(par, 0x0021, HEIGHT - 1 - xs);
+               break;
+       }
+       write_reg(par, 0x0022); /* 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) {
+       case 0:
+               write_reg(par, 0x3, (par->bgr << 12) | 0x30);
+               break;
+       case 270:
+               write_reg(par, 0x3, (par->bgr << 12) | 0x28);
+               break;
+       case 180:
+               write_reg(par, 0x3, (par->bgr << 12) | 0x00);
+               break;
+       case 90:
+               write_reg(par, 0x3, (par->bgr << 12) | 0x18);
+               break;
+       }
+       return 0;
+}
+
+/*
+  Gamma string format:
+    VRP0 VRP1 RP0 RP1 KP0 KP1 KP2 KP3 KP4 KP5
+    VRN0 VRN1 RN0 RN1 KN0 KN1 KN2 KN3 KN4 KN5
+*/
+#define CURVE(num, idx)  curves[num*par->gamma.num_values + idx]
+static int set_gamma(struct fbtft_par *par, unsigned long *curves)
+{
+       unsigned long mask[] = {
+               0b11111, 0b11111, 0b111, 0b111, 0b111,
+               0b111, 0b111, 0b111, 0b111, 0b111,
+               0b11111, 0b11111, 0b111, 0b111, 0b111,
+               0b111, 0b111, 0b111, 0b111, 0b111 };
+       int i, j;
+
+       fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
+
+       /* apply mask */
+       for (i = 0; i < 2; i++)
+               for (j = 0; j < 10; j++)
+                       CURVE(i, j) &= mask[i*par->gamma.num_values + j];
+
+       write_reg(par, 0x0030, CURVE(0, 5) << 8 | CURVE(0, 4));
+       write_reg(par, 0x0031, CURVE(0, 7) << 8 | CURVE(0, 6));
+       write_reg(par, 0x0032, CURVE(0, 9) << 8 | CURVE(0, 8));
+       write_reg(par, 0x0035, CURVE(0, 3) << 8 | CURVE(0, 2));
+       write_reg(par, 0x0036, CURVE(0, 1) << 8 | CURVE(0, 0));
+
+       write_reg(par, 0x0037, CURVE(1, 5) << 8 | CURVE(1, 4));
+       write_reg(par, 0x0038, CURVE(1, 7) << 8 | CURVE(1, 6));
+       write_reg(par, 0x0039, CURVE(1, 9) << 8 | CURVE(1, 8));
+       write_reg(par, 0x003C, CURVE(1, 3) << 8 | CURVE(1, 2));
+       write_reg(par, 0x003D, CURVE(1, 1) << 8 | CURVE(1, 0));
+
+       return 0;
+}
+#undef CURVE
+
+
+static struct fbtft_display display = {
+       .regwidth = 16,
+       .width = WIDTH,
+       .height = HEIGHT,
+       .gamma_num = 2,
+       .gamma_len = 10,
+       .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,ili9320", &display);
+
+MODULE_ALIAS("spi:" DRVNAME);
+MODULE_ALIAS("platform:" DRVNAME);
+MODULE_ALIAS("spi:ili9320");
+MODULE_ALIAS("platform:ili9320");
+
+MODULE_DESCRIPTION("FB driver for the ILI9320 LCD Controller");
+MODULE_AUTHOR("Noralf Tronnes");
+MODULE_LICENSE("GPL");