diff options
Diffstat (limited to 'drivers/staging/fbtft/fb_upd161704.c')
| -rw-r--r-- | drivers/staging/fbtft/fb_upd161704.c | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/drivers/staging/fbtft/fb_upd161704.c b/drivers/staging/fbtft/fb_upd161704.c new file mode 100644 index 000000000000..fff57b330ba2 --- /dev/null +++ b/drivers/staging/fbtft/fb_upd161704.c @@ -0,0 +1,206 @@ +/* + * 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. + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/gpio.h> +#include <linux/delay.h> + +#include "fbtft.h" + +#define DRVNAME "fb_upd161704" +#define WIDTH 240 +#define HEIGHT 320 +#define BPP 16 + +static int init_display(struct fbtft_par *par) +{ + fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__); + + par->fbtftops.reset(par); + + if (par->gpio.cs != -1) + gpio_set_value(par->gpio.cs, 0); /* Activate chip */ + + /* Initialization sequence from Lib_UTFT */ + + /* register reset */ + write_reg(par, 0x0003,0x0001); /* Soft reset */ + + /* oscillator start */ + write_reg(par, 0x003A,0x0001); /*Oscillator 0: stop, 1: operation */ + udelay(100); + + /* 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 */ + + /* Basical clock for 1 line (BASECOUNT[7:0]) number specified */ + write_reg(par, 0x002E,0x002D); + + /* 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 */ + + /* 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 */ + + /* 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 */ + + /* Gate scan setting */ + write_reg(par, 0x0032,0x0002); + + /* n line inversion line number */ + write_reg(par, 0x0033,0x0000); + + /* Line inversion/frame inversion/interlace setting */ + write_reg(par, 0x0037,0x0000); + + /* Gate scan operation setting register */ + write_reg(par, 0x003B,0x0001); + + /* Color mode */ + /*GS = 0: 260-k color (64 gray scale), GS = 1: 8 color (2 gray scale) */ + write_reg(par, 0x0004,0x0000); + + /* RAM control register */ + write_reg(par, 0x0005,0x0000); /*Window access 00:Normal, 10:Window */ + + /* Display setting register 2 */ + write_reg(par, 0x0001,0x0000); + + /* display setting */ + write_reg(par, 0x0000,0x0000); /* 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, 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; + } + + write_reg(par, 0x0e); /* 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) { + /* 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; + } + + return 0; +} + +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); + +MODULE_ALIAS("spi:" DRVNAME); +MODULE_ALIAS("platform:" DRVNAME); +MODULE_ALIAS("spi:upd161704"); +MODULE_ALIAS("platform:upd161704"); + +MODULE_DESCRIPTION("FB driver for the uPD161704 LCD Controller"); +MODULE_AUTHOR("Seong-Woo Kim"); +MODULE_LICENSE("GPL"); |