diff options
Diffstat (limited to 'drivers/staging/fbtft/fb_ili9340.c')
| -rw-r--r-- | drivers/staging/fbtft/fb_ili9340.c | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/drivers/staging/fbtft/fb_ili9340.c b/drivers/staging/fbtft/fb_ili9340.c new file mode 100644 index 000000000000..985687d94ec2 --- /dev/null +++ b/drivers/staging/fbtft/fb_ili9340.c @@ -0,0 +1,163 @@ +/* + * FB driver for the ILI9340 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/delay.h> + +#include "fbtft.h" + +#define DRVNAME "fb_ili9340" +#define WIDTH 240 +#define HEIGHT 320 + + +/* Init sequence taken from: Arduino Library for the Adafruit 2.2" display */ +static int init_display(struct fbtft_par *par) +{ + fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__); + + par->fbtftops.reset(par); + + write_reg(par, 0xEF, 0x03, 0x80, 0x02); + write_reg(par, 0xCF, 0x00 , 0XC1 , 0X30); + write_reg(par, 0xED, 0x64 , 0x03 , 0X12 , 0X81); + write_reg(par, 0xE8, 0x85 , 0x00 , 0x78); + write_reg(par, 0xCB, 0x39 , 0x2C , 0x00 , 0x34 , 0x02); + write_reg(par, 0xF7, 0x20); + write_reg(par, 0xEA, 0x00 , 0x00); + + /* Power Control 1 */ + write_reg(par, 0xC0, 0x23); + + /* Power Control 2 */ + write_reg(par, 0xC1, 0x10); + + /* VCOM Control 1 */ + write_reg(par, 0xC5, 0x3e, 0x28); + + /* VCOM Control 2 */ + write_reg(par, 0xC7, 0x86); + + /* COLMOD: Pixel Format Set */ + /* 16 bits/pixel */ + write_reg(par, 0x3A, 0x55); + + /* Frame Rate Control */ + /* Division ratio = fosc, Frame Rate = 79Hz */ + write_reg(par, 0xB1, 0x00, 0x18); + + /* Display Function Control */ + write_reg(par, 0xB6, 0x08, 0x82, 0x27); + + /* Gamma Function Disable */ + write_reg(par, 0xF2, 0x00); + + /* Gamma curve selected */ + write_reg(par, 0x26, 0x01); + + /* Positive Gamma Correction */ + write_reg(par, 0xE0, + 0x0F, 0x31, 0x2B, 0x0C, 0x0E, 0x08, 0x4E, 0xF1, + 0x37, 0x07, 0x10, 0x03, 0x0E, 0x09, 0x00); + + /* Negative Gamma Correction */ + write_reg(par, 0xE1, + 0x00, 0x0E, 0x14, 0x03, 0x11, 0x07, 0x31, 0xC1, + 0x48, 0x08, 0x0F, 0x0C, 0x31, 0x36, 0x0F); + + /* Sleep OUT */ + write_reg(par, 0x11); + + mdelay(120); + + /* Display ON */ + write_reg(par, 0x29); + + 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 address */ + write_reg(par, 0x2A, xs >> 8, xs & 0xFF, xe >> 8, xe & 0xFF); + + /* Row adress */ + write_reg(par, 0x2B, ys >> 8, ys & 0xFF, ye >> 8, ye & 0xFF); + + /* Memory write */ + write_reg(par, 0x2C); +} + +#define ILI9340_MADCTL_MV 0x20 +#define ILI9340_MADCTL_MX 0x40 +#define ILI9340_MADCTL_MY 0x80 +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 = ILI9340_MADCTL_MV; + break; + case 180: + val = ILI9340_MADCTL_MY; + break; + case 90: + val = ILI9340_MADCTL_MV | ILI9340_MADCTL_MY | ILI9340_MADCTL_MX; + break; + default: + val = ILI9340_MADCTL_MX; + break; + } + /* Memory Access Control */ + write_reg(par, 0x36, val | (par->bgr << 3)); + + return 0; +} + + +static struct fbtft_display display = { + .regwidth = 8, + .width = WIDTH, + .height = HEIGHT, + .fbtftops = { + .init_display = init_display, + .set_addr_win = set_addr_win, + .set_var = set_var, + }, +}; +FBTFT_REGISTER_DRIVER(DRVNAME, "ilitek,ili9340", &display); + +MODULE_ALIAS("spi:" DRVNAME); +MODULE_ALIAS("platform:" DRVNAME); +MODULE_ALIAS("spi:ili9340"); +MODULE_ALIAS("platform:ili9340"); + +MODULE_DESCRIPTION("FB driver for the ILI9340 LCD Controller"); +MODULE_AUTHOR("Noralf Tronnes"); +MODULE_LICENSE("GPL"); |