[PATCH 07/29] staging: fbtft: add fb_ili9320 driver
Thomas Petazzoni
thomas.petazzoni at free-electrons.com
Wed Dec 31 09:11:15 UTC 2014
This commit adds the fb_ili9320 driver from the fbtft project at
https://github.com/notro/fbtft.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>
---
drivers/staging/fbtft/Kconfig | 6 +
drivers/staging/fbtft/Makefile | 1 +
drivers/staging/fbtft/fb_ili9320.c | 234 +++++++++++++++++++++++++++++++++++++
3 files changed, 241 insertions(+)
create mode 100644 drivers/staging/fbtft/fb_ili9320.c
diff --git a/drivers/staging/fbtft/Kconfig b/drivers/staging/fbtft/Kconfig
index 015429b..eb57f19 100644
--- a/drivers/staging/fbtft/Kconfig
+++ b/drivers/staging/fbtft/Kconfig
@@ -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
diff --git a/drivers/staging/fbtft/Makefile b/drivers/staging/fbtft/Makefile
index 766e285..e101cb6 100644
--- a/drivers/staging/fbtft/Makefile
+++ b/drivers/staging/fbtft/Makefile
@@ -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
index 0000000..b26d893
--- /dev/null
+++ b/drivers/staging/fbtft/fb_ili9320.c
@@ -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");
--
2.1.0
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