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staging: fbtft: add fb_upd161704 driver
This commit adds the fb_upd161704 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>
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/* | ||
* FB driver for the uPD161704 LCD Controller | ||
* | ||
* Copyright (C) 2014 Seong-Woo Kim | ||
* | ||
* Based on fb_ili9325.c by Noralf Tronnes | ||
* Based on ili9325.c by Jeroen Domburg | ||
* Init code from UTFT library by Henning Karlsen | ||
* | ||
* 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. | ||
*/ | ||
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#include <linux/module.h> | ||
#include <linux/kernel.h> | ||
#include <linux/init.h> | ||
#include <linux/gpio.h> | ||
#include <linux/delay.h> | ||
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#include "fbtft.h" | ||
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#define DRVNAME "fb_upd161704" | ||
#define WIDTH 240 | ||
#define HEIGHT 320 | ||
#define BPP 16 | ||
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static int init_display(struct fbtft_par *par) | ||
{ | ||
fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__); | ||
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par->fbtftops.reset(par); | ||
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if (par->gpio.cs != -1) | ||
gpio_set_value(par->gpio.cs, 0); /* Activate chip */ | ||
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/* Initialization sequence from Lib_UTFT */ | ||
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/* register reset */ | ||
write_reg(par, 0x0003,0x0001); /* Soft reset */ | ||
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/* oscillator start */ | ||
write_reg(par, 0x003A,0x0001); /*Oscillator 0: stop, 1: operation */ | ||
udelay(100); | ||
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/* y-setting */ | ||
write_reg(par, 0x0024,0x007B); /* amplitude setting */ | ||
udelay(10); | ||
write_reg(par, 0x0025,0x003B); /* amplitude setting */ | ||
write_reg(par, 0x0026,0x0034); /* amplitude setting */ | ||
udelay(10); | ||
write_reg(par, 0x0027,0x0004); /* amplitude setting */ | ||
write_reg(par, 0x0052,0x0025); /* circuit setting 1 */ | ||
udelay(10); | ||
write_reg(par, 0x0053,0x0033); /* circuit setting 2 */ | ||
write_reg(par, 0x0061,0x001C); /* adjustment V10 positive polarity */ | ||
udelay(10); | ||
write_reg(par, 0x0062,0x002C); /* adjustment V9 negative polarity */ | ||
write_reg(par, 0x0063,0x0022); /* adjustment V34 positive polarity */ | ||
udelay(10); | ||
write_reg(par, 0x0064,0x0027); /* adjustment V31 negative polarity */ | ||
udelay(10); | ||
write_reg(par, 0x0065,0x0014); /* adjustment V61 negative polarity */ | ||
udelay(10); | ||
write_reg(par, 0x0066,0x0010); /* adjustment V61 negative polarity */ | ||
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/* Basical clock for 1 line (BASECOUNT[7:0]) number specified */ | ||
write_reg(par, 0x002E,0x002D); | ||
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/* Power supply setting */ | ||
write_reg(par, 0x0019,0x0000); /* DC/DC output setting */ | ||
udelay(200); | ||
write_reg(par, 0x001A,0x1000); /* DC/DC frequency setting */ | ||
write_reg(par, 0x001B,0x0023); /* DC/DC rising setting */ | ||
write_reg(par, 0x001C,0x0C01); /* Regulator voltage setting */ | ||
write_reg(par, 0x001D,0x0000); /* Regulator current setting */ | ||
write_reg(par, 0x001E,0x0009); /* VCOM output setting */ | ||
write_reg(par, 0x001F,0x0035); /* VCOM amplitude setting */ | ||
write_reg(par, 0x0020,0x0015); /* VCOMM cencter setting */ | ||
write_reg(par, 0x0018,0x1E7B); /* DC/DC operation setting */ | ||
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/* windows setting */ | ||
write_reg(par, 0x0008,0x0000); /* Minimum X address */ | ||
write_reg(par, 0x0009,0x00EF); /* Maximum X address */ | ||
write_reg(par, 0x000a,0x0000); /* Minimum Y address */ | ||
write_reg(par, 0x000b,0x013F); /* Maximum Y address */ | ||
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/* LCD display area setting */ | ||
write_reg(par, 0x0029,0x0000); /* [LCDSIZE] X MIN. size set */ | ||
write_reg(par, 0x002A,0x0000); /* [LCDSIZE] Y MIN. size set */ | ||
write_reg(par, 0x002B,0x00EF); /* [LCDSIZE] X MAX. size set */ | ||
write_reg(par, 0x002C,0x013F); /* [LCDSIZE] Y MAX. size set */ | ||
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/* Gate scan setting */ | ||
write_reg(par, 0x0032,0x0002); | ||
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/* n line inversion line number */ | ||
write_reg(par, 0x0033,0x0000); | ||
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/* Line inversion/frame inversion/interlace setting */ | ||
write_reg(par, 0x0037,0x0000); | ||
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/* Gate scan operation setting register */ | ||
write_reg(par, 0x003B,0x0001); | ||
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/* Color mode */ | ||
/*GS = 0: 260-k color (64 gray scale), GS = 1: 8 color (2 gray scale) */ | ||
write_reg(par, 0x0004,0x0000); | ||
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/* RAM control register */ | ||
write_reg(par, 0x0005,0x0000); /*Window access 00:Normal, 10:Window */ | ||
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/* Display setting register 2 */ | ||
write_reg(par, 0x0001,0x0000); | ||
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/* display setting */ | ||
write_reg(par, 0x0000,0x0000); /* display on */ | ||
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return 0; | ||
} | ||
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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, 0x0006, xs); | ||
write_reg(par, 0x0007, ys); | ||
break; | ||
case 180: | ||
write_reg(par, 0x0006, WIDTH - 1 - xs); | ||
write_reg(par, 0x0007, HEIGHT - 1 - ys); | ||
break; | ||
case 270: | ||
write_reg(par, 0x0006, WIDTH - 1 - ys); | ||
write_reg(par, 0x0007, xs); | ||
break; | ||
case 90: | ||
write_reg(par, 0x0006, ys); | ||
write_reg(par, 0x0007, HEIGHT - 1 - xs); | ||
break; | ||
} | ||
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write_reg(par, 0x0e); /* Write Data to GRAM */ | ||
} | ||
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static int set_var(struct fbtft_par *par) | ||
{ | ||
fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__); | ||
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switch (par->info->var.rotate) { | ||
/* AM: GRAM update direction */ | ||
case 0: | ||
write_reg(par, 0x01, 0x0000); | ||
write_reg(par, 0x05, 0x0000); | ||
break; | ||
case 180: | ||
write_reg(par, 0x01, 0x00C0); | ||
write_reg(par, 0x05, 0x0000); | ||
break; | ||
case 270: | ||
write_reg(par, 0x01, 0x0080); | ||
write_reg(par, 0x05, 0x0001); | ||
break; | ||
case 90: | ||
write_reg(par, 0x01, 0x0040); | ||
write_reg(par, 0x05, 0x0001); | ||
break; | ||
} | ||
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return 0; | ||
} | ||
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static struct fbtft_display display = { | ||
.regwidth = 16, | ||
.width = WIDTH, | ||
.height = HEIGHT, | ||
.fbtftops = { | ||
.init_display = init_display, | ||
.set_addr_win = set_addr_win, | ||
.set_var = set_var, | ||
}, | ||
}; | ||
FBTFT_REGISTER_DRIVER(DRVNAME, "nec,upd161704", &display); | ||
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MODULE_ALIAS("spi:" DRVNAME); | ||
MODULE_ALIAS("platform:" DRVNAME); | ||
MODULE_ALIAS("spi:upd161704"); | ||
MODULE_ALIAS("platform:upd161704"); | ||
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MODULE_DESCRIPTION("FB driver for the uPD161704 LCD Controller"); | ||
MODULE_AUTHOR("Seong-Woo Kim"); | ||
MODULE_LICENSE("GPL"); |