diff options
Diffstat (limited to 'drivers/staging/fbtft/fb_uc1701.c')
| -rw-r--r-- | drivers/staging/fbtft/fb_uc1701.c | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/drivers/staging/fbtft/fb_uc1701.c b/drivers/staging/fbtft/fb_uc1701.c new file mode 100644 index 000000000000..d70ac524278c --- /dev/null +++ b/drivers/staging/fbtft/fb_uc1701.c @@ -0,0 +1,210 @@ +/* + * FB driver for the UC1701 LCD Controller + * + * The display is monochrome and the video memory is RGB565. + * Any pixel value except 0 turns the pixel on. + * + * Copyright (C) 2014 Juergen Holzmann + * + * 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/spi/spi.h> +#include <linux/delay.h> + +#include "fbtft.h" + +#define DRVNAME "fb_uc1701" +#define WIDTH 102 +#define HEIGHT 64 +#define PAGES (HEIGHT/8) + +/* 1: Display on/off */ +#define LCD_DISPLAY_ENABLE 0xAE +/* 2: display start line set */ +#define LCD_START_LINE 0x40 +/* 3: Page address set (lower 4 bits select one of the pages) */ +#define LCD_PAGE_ADDRESS 0xB0 +/* 4: column address */ +#define LCD_COL_ADDRESS 0x10 +/* 8: select orientation */ +#define LCD_BOTTOMVIEW 0xA0 +/* 9: inverted display */ +#define LCD_DISPLAY_INVERT 0xA6 +/* 10: show memory content or switch all pixels on */ +#define LCD_ALL_PIXEL 0xA4 +/* 11: lcd bias set */ +#define LCD_BIAS 0xA2 +/* 14: Reset Controller */ +#define LCD_RESET_CMD 0xE2 +/* 15: output mode select (turns display upside-down) */ +#define LCD_SCAN_DIR 0xC0 +/* 16: power control set */ +#define LCD_POWER_CONTROL 0x28 +/* 17: voltage regulator resistor ratio set */ +#define LCD_VOLTAGE 0x20 +/* 18: Volume mode set */ +#define LCD_VOLUME_MODE 0x81 +/* 22: NOP command */ +#define LCD_NO_OP 0xE3 +/* 25: advanced program control */ +#define LCD_ADV_PROG_CTRL 0xFA +/* 25: advanced program control2 */ +#define LCD_ADV_PROG_CTRL2 0x10 +#define LCD_TEMPCOMP_HIGH 0x80 +/* column offset for normal orientation */ +#define SHIFT_ADDR_NORMAL 0 +/* column offset for bottom view orientation */ +#define SHIFT_ADDR_TOPVIEW 30 + + +static int init_display(struct fbtft_par *par) +{ + fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__); + + par->fbtftops.reset(par); + + /* softreset of LCD */ + write_reg(par, LCD_RESET_CMD); + mdelay(10); + + /* set startpoint */ + /* LCD_START_LINE | (pos & 0x3F) */ + write_reg(par, LCD_START_LINE); + + /* select orientation BOTTOMVIEW */ + write_reg(par, LCD_BOTTOMVIEW | 1); + /* output mode select (turns display upside-down) */ + write_reg(par, LCD_SCAN_DIR | 0x00); + + /* Normal Pixel mode */ + write_reg(par, LCD_ALL_PIXEL | 0); + + /* positive display */ + write_reg(par, LCD_DISPLAY_INVERT | 0); + + /* bias 1/9 */ + write_reg(par, LCD_BIAS | 0); + + /* power control mode: all features on */ + /* LCD_POWER_CONTROL | (val&0x07) */ + write_reg(par, LCD_POWER_CONTROL | 0x07); + + /* set voltage regulator R/R */ + /* LCD_VOLTAGE | (val&0x07) */ + write_reg(par, LCD_VOLTAGE | 0x07); + + /* volume mode set */ + /* LCD_VOLUME_MODE,val&0x3f,LCD_NO_OP */ + write_reg(par, LCD_VOLUME_MODE); + /* LCD_VOLUME_MODE,val&0x3f,LCD_NO_OP */ + write_reg(par, 0x09); + /* ???? */ + /* LCD_VOLUME_MODE,val&0x3f,LCD_NO_OP */ + write_reg(par, LCD_NO_OP); + + /* advanced program control */ + write_reg(par, LCD_ADV_PROG_CTRL); + write_reg(par, LCD_ADV_PROG_CTRL2|LCD_TEMPCOMP_HIGH); + + /* enable display */ + write_reg(par, LCD_DISPLAY_ENABLE | 1); + + 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); + + /* goto address */ + /* LCD_PAGE_ADDRESS | ((page) & 0x1F), + (((col)+SHIFT_ADDR_NORMAL) & 0x0F), + LCD_COL_ADDRESS | ((((col)+SHIFT_ADDR_NORMAL)>>4) & 0x0F) */ + write_reg(par, LCD_PAGE_ADDRESS); + /* LCD_PAGE_ADDRESS | ((page) & 0x1F), + (((col)+SHIFT_ADDR_NORMAL) & 0x0F), + LCD_COL_ADDRESS | ((((col)+SHIFT_ADDR_NORMAL)>>4) & 0x0F) */ + write_reg(par, 0x00); + /* LCD_PAGE_ADDRESS | ((page) & 0x1F), + (((col)+SHIFT_ADDR_NORMAL) & 0x0F), + LCD_COL_ADDRESS | ((((col)+SHIFT_ADDR_NORMAL)>>4) & 0x0F) */ + write_reg(par, LCD_COL_ADDRESS); +} + +static int write_vmem(struct fbtft_par *par, size_t offset, size_t len) +{ + u16 *vmem16 = (u16 *)par->info->screen_base; + u8 *buf = par->txbuf.buf; + int x, y, i; + int ret = 0; + + fbtft_par_dbg(DEBUG_WRITE_VMEM, par, "%s()\n", __func__); + + for (y = 0; y < PAGES; y++) { + buf = par->txbuf.buf; + for (x = 0; x < WIDTH; x++) { + *buf = 0x00; + for (i = 0; i < 8; i++) + *buf |= (vmem16[((y*8*WIDTH)+(i*WIDTH))+x] ? 1 : 0) << i; + buf++; + } + /* LCD_PAGE_ADDRESS | ((page) & 0x1F), + (((col)+SHIFT_ADDR_NORMAL) & 0x0F), + LCD_COL_ADDRESS | ((((col)+SHIFT_ADDR_NORMAL)>>4) & 0x0F) */ + write_reg(par, LCD_PAGE_ADDRESS|(u8)y); + /* LCD_PAGE_ADDRESS | ((page) & 0x1F), + (((col)+SHIFT_ADDR_NORMAL) & 0x0F), + LCD_COL_ADDRESS | ((((col)+SHIFT_ADDR_NORMAL)>>4) & 0x0F) */ + write_reg(par, 0x00); + /* LCD_PAGE_ADDRESS | ((page) & 0x1F), + (((col)+SHIFT_ADDR_NORMAL) & 0x0F), + LCD_COL_ADDRESS | ((((col)+SHIFT_ADDR_NORMAL)>>4) & 0x0F) */ + write_reg(par, LCD_COL_ADDRESS); + gpio_set_value(par->gpio.dc, 1); + ret = par->fbtftops.write(par, par->txbuf.buf, WIDTH); + gpio_set_value(par->gpio.dc, 0); + } + + if (ret < 0) + dev_err(par->info->device, "%s: write failed and returned: %d\n", __func__, ret); + + return ret; +} + + +static struct fbtft_display display = { + .regwidth = 8, + .width = WIDTH, + .height = HEIGHT, + .fbtftops = { + .init_display = init_display, + .set_addr_win = set_addr_win, + .write_vmem = write_vmem, + }, + .backlight = 1, +}; +FBTFT_REGISTER_DRIVER(DRVNAME, "UltraChip,uc1701", &display); + +MODULE_ALIAS("spi:" DRVNAME); +MODULE_ALIAS("spi:uc1701"); + +MODULE_DESCRIPTION("FB driver for the UC1701 LCD Controller"); +MODULE_AUTHOR("Juergen Holzmann"); +MODULE_LICENSE("GPL"); |