staging: fbtft: Add support for Himax HX8357D controller

The Himax HX8357D is used e.g. by the Adafruit PITFT Plus 3.5".
Adafruit added HX8357D support to an own fork of fbtft and support
Raspbian only (https://github.com/adafruit/adafruit-rpi-fbtft/).
They don't intend to push it upstream but gave me the ok to do so.
Original author: Sean Cross <[e-mail]>

I just applied small changes to the driver to align it with the other
fbtft drivers.
- add "compatible" argument to FBTFT_REGISTER_DRIVER call
- add missing MODULE_ALIAS declarations

Tested successfully with this display on an RPI2 under Arch Linux ARM
(kernel 3.18.13).

Signed-off-by: Heiner Kallweit <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/fbtft/Kconfig

···
 	help
 	  Generic Framebuffer support for HX8353D
 
+config FB_TFT_HX8357D
+	tristate "FB driver for the HX8357D LCD Controller"
+	depends on FB_TFT
+	help
+	  Generic Framebuffer support for HX8357D
+
 config FB_TFT_ILI9163
 	tristate "FB driver for the ILI9163 LCD Controller"
 	depends on FB_TFT

drivers/staging/fbtft/Makefile

···
 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_HX8357D)     += fb_hx8357d.o
 obj-$(CONFIG_FB_TFT_ILI9163)     += fb_ili9163.o
 obj-$(CONFIG_FB_TFT_ILI9320)     += fb_ili9320.o
 obj-$(CONFIG_FB_TFT_ILI9325)     += fb_ili9325.o

drivers/staging/fbtft/fb_hx8357d.c

···
+/*
+ * FB driver for the HX8357D LCD Controller
+ * Copyright (C) 2015 Adafruit Industries
+ *
+ * Based on the HX8347D FB driver
+ * Copyright (C) 2013 Christian Vogelgsang
+ *
+ * Based on driver code found here: https://github.com/watterott/r61505u-Adapter
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+
+#include "fbtft.h"
+#include "fb_hx8357d.h"
+
+#define DRVNAME		"fb_hx8357d"
+#define WIDTH		320
+#define HEIGHT		480
+
+
+static int init_display(struct fbtft_par *par)
+{
+	fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
+
+	par->fbtftops.reset(par);
+
+	/* Reset things like Gamma */
+	write_reg(par, HX8357B_SWRESET);
+	usleep_range(5000, 7000);
+
+	/* setextc */
+	write_reg(par, HX8357D_SETC, 0xFF, 0x83, 0x57);
+	msleep(150);
+
+	/* setRGB which also enables SDO */
+	write_reg(par, HX8357_SETRGB, 0x00, 0x00, 0x06, 0x06);
+
+	/* -1.52V */
+	write_reg(par, HX8357D_SETCOM, 0x25);
+
+	/* Normal mode 70Hz, Idle mode 55 Hz */
+	write_reg(par, HX8357_SETOSC, 0x68);
+
+	/* Set Panel - BGR, Gate direction swapped */
+	write_reg(par, HX8357_SETPANEL, 0x05);
+
+	write_reg(par, HX8357_SETPWR1,
+		0x00,  /* Not deep standby */
+		0x15,  /* BT */
+		0x1C,  /* VSPR */
+		0x1C,  /* VSNR */
+		0x83,  /* AP */
+		0xAA);  /* FS */
+
+	write_reg(par, HX8357D_SETSTBA,
+		0x50,  /* OPON normal */
+		0x50,  /* OPON idle */
+		0x01,  /* STBA */
+		0x3C,  /* STBA */
+		0x1E,  /* STBA */
+		0x08);  /* GEN */
+
+	write_reg(par, HX8357D_SETCYC,
+		0x02,  /* NW 0x02 */
+		0x40,  /* RTN */
+		0x00,  /* DIV */
+		0x2A,  /* DUM */
+		0x2A,  /* DUM */
+		0x0D,  /* GDON */
+		0x78);  /* GDOFF */
+
+	write_reg(par, HX8357D_SETGAMMA,
+		0x02,
+		0x0A,
+		0x11,
+		0x1d,
+		0x23,
+		0x35,
+		0x41,
+		0x4b,
+		0x4b,
+		0x42,
+		0x3A,
+		0x27,
+		0x1B,
+		0x08,
+		0x09,
+		0x03,
+		0x02,
+		0x0A,
+		0x11,
+		0x1d,
+		0x23,
+		0x35,
+		0x41,
+		0x4b,
+		0x4b,
+		0x42,
+		0x3A,
+		0x27,
+		0x1B,
+		0x08,
+		0x09,
+		0x03,
+		0x00,
+		0x01);
+
+	/* 16 bit */
+	write_reg(par, HX8357_COLMOD, 0x55);
+
+	write_reg(par, HX8357_MADCTL, 0xC0);
+
+	/* TE off */
+	write_reg(par, HX8357_TEON, 0x00);
+
+	/* tear line */
+	write_reg(par, HX8357_TEARLINE, 0x00, 0x02);
+
+	/* Exit Sleep */
+	write_reg(par, HX8357_SLPOUT);
+	msleep(150);
+
+	/* display on */
+	write_reg(par, HX8357_DISPON);
+	usleep_range(5000, 7000);
+
+	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 addr set */
+	write_reg(par, HX8357_CASET,
+		xs >> 8, xs & 0xff,  /* XSTART */
+		xe >> 8, xe & 0xff); /* XEND */
+
+	/* Row addr set */
+	write_reg(par, HX8357_PASET,
+		ys >> 8, ys & 0xff,  /* YSTART */
+		ye >> 8, ye & 0xff); /* YEND */
+
+	/* write to RAM */
+	write_reg(par, HX8357_RAMWR);
+}
+
+#define HX8357D_MADCTL_MY  0x80
+#define HX8357D_MADCTL_MX  0x40
+#define HX8357D_MADCTL_MV  0x20
+#define HX8357D_MADCTL_ML  0x10
+#define HX8357D_MADCTL_RGB 0x00
+#define HX8357D_MADCTL_BGR 0x08
+#define HX8357D_MADCTL_MH  0x04
+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 = HX8357D_MADCTL_MV | HX8357D_MADCTL_MX;
+		break;
+	case 180:
+		val = 0;
+		break;
+	case 90:
+		val = HX8357D_MADCTL_MV | HX8357D_MADCTL_MY;
+		break;
+	default:
+		val = HX8357D_MADCTL_MX | HX8357D_MADCTL_MY;
+		break;
+	}
+
+	val |= (par->bgr ? HX8357D_MADCTL_RGB : HX8357D_MADCTL_BGR);
+
+	/* Memory Access Control */
+	write_reg(par, HX8357_MADCTL, val);
+
+	return 0;
+}
+
+static struct fbtft_display display = {
+	.regwidth = 8,
+	.width = WIDTH,
+	.height = HEIGHT,
+	.gamma_num = 2,
+	.gamma_len = 14,
+	.fbtftops = {
+		.init_display = init_display,
+		.set_addr_win = set_addr_win,
+		.set_var = set_var,
+	},
+};
+FBTFT_REGISTER_DRIVER(DRVNAME, "himax,hx8357d", &display);
+
+MODULE_ALIAS("spi:" DRVNAME);
+MODULE_ALIAS("platform:" DRVNAME);
+MODULE_ALIAS("spi:hx8357d");
+MODULE_ALIAS("platform:hx8357d");
+
+MODULE_DESCRIPTION("FB driver for the HX8357D LCD Controller");
+MODULE_AUTHOR("Sean Cross <[e-mail]>");
+MODULE_LICENSE("GPL");

drivers/staging/fbtft/fb_hx8357d.h

···
+/***************************************************
+  This is our library for the Adafruit  ILI9341 Breakout and Shield
+  ----> http://www.adafruit.com/products/1651
+
+  Check out the links above for our tutorials and wiring diagrams
+  These displays use SPI to communicate, 4 or 5 pins are required to
+  interface (RST is optional)
+  Adafruit invests time and resources providing this open source code,
+  please support Adafruit and open-source hardware by purchasing
+  products from Adafruit!
+
+  Written by Limor Fried/Ladyada for Adafruit Industries.
+  MIT license, all text above must be included in any redistribution
+ ****************************************************/
+
+#ifndef __HX8357_H__
+#define __HX8357_H__
+
+#define HX8357D 0xD
+#define HX8357B 0xB
+
+#define HX8357_TFTWIDTH  320
+#define HX8357_TFTHEIGHT 480
+
+#define HX8357B_NOP     0x00
+#define HX8357B_SWRESET 0x01
+#define HX8357B_RDDID   0x04
+#define HX8357B_RDDST   0x09
+
+#define HX8357B_RDPOWMODE  0x0A
+#define HX8357B_RDMADCTL  0x0B
+#define HX8357B_RDCOLMOD  0x0C
+#define HX8357B_RDDIM  0x0D
+#define HX8357B_RDDSDR  0x0F
+
+#define HX8357_SLPIN   0x10
+#define HX8357_SLPOUT  0x11
+#define HX8357B_PTLON   0x12
+#define HX8357B_NORON   0x13
+
+#define HX8357_INVOFF  0x20
+#define HX8357_INVON   0x21
+#define HX8357_DISPOFF 0x28
+#define HX8357_DISPON  0x29
+
+#define HX8357_CASET   0x2A
+#define HX8357_PASET   0x2B
+#define HX8357_RAMWR   0x2C
+#define HX8357_RAMRD   0x2E
+
+#define HX8357B_PTLAR   0x30
+#define HX8357_TEON  0x35
+#define HX8357_TEARLINE  0x44
+#define HX8357_MADCTL  0x36
+#define HX8357_COLMOD  0x3A
+
+#define HX8357_SETOSC 0xB0
+#define HX8357_SETPWR1 0xB1
+#define HX8357B_SETDISPLAY 0xB2
+#define HX8357_SETRGB 0xB3
+#define HX8357D_SETCOM  0xB6
+
+#define HX8357B_SETDISPMODE  0xB4
+#define HX8357D_SETCYC  0xB4
+#define HX8357B_SETOTP 0xB7
+#define HX8357D_SETC 0xB9
+
+#define HX8357B_SET_PANEL_DRIVING 0xC0
+#define HX8357D_SETSTBA 0xC0
+#define HX8357B_SETDGC  0xC1
+#define HX8357B_SETID  0xC3
+#define HX8357B_SETDDB  0xC4
+#define HX8357B_SETDISPLAYFRAME 0xC5
+#define HX8357B_GAMMASET 0xC8
+#define HX8357B_SETCABC  0xC9
+#define HX8357_SETPANEL  0xCC
+
+#define HX8357B_SETPOWER 0xD0
+#define HX8357B_SETVCOM 0xD1
+#define HX8357B_SETPWRNORMAL 0xD2
+
+#define HX8357B_RDID1   0xDA
+#define HX8357B_RDID2   0xDB
+#define HX8357B_RDID3   0xDC
+#define HX8357B_RDID4   0xDD
+
+#define HX8357D_SETGAMMA 0xE0
+
+#define HX8357B_SETGAMMA 0xC8
+#define HX8357B_SETPANELRELATED  0xE9
+
+/* Color definitions */
+#define	HX8357_BLACK   0x0000
+#define	HX8357_BLUE    0x001F
+#define	HX8357_RED     0xF800
+#define	HX8357_GREEN   0x07E0
+#define HX8357_CYAN    0x07FF
+#define HX8357_MAGENTA 0xF81F
+#define HX8357_YELLOW  0xFFE0
+#define HX8357_WHITE   0xFFFF
+
+#endif /* __HX8357_H__ */