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/*
* 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 <xobs@kosagi.com>");
MODULE_LICENSE("GPL");
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