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staging: fbtft: add fb_pcd8544 driver
This commit adds the fb_pcd8544 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>
This commit is contained in:
Thomas Petazzoni
Greg Kroah-Hartman
parent
8d64b032aa
commit
39c3907243
3 changed files with 184 additions and 0 deletions
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@ -73,3 +73,9 @@ config FB_TFT_ILI9486
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depends on FB_TFT
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help
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Generic Framebuffer support for ILI9486
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config FB_TFT_PCD8544
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tristate "FB driver for the PCD8544 LCD Controller"
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depends on FB_TFT
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help
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Generic Framebuffer support for PCD8544
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@ -14,3 +14,4 @@ obj-$(CONFIG_FB_TFT_ILI9340) += fb_ili9340.o
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obj-$(CONFIG_FB_TFT_ILI9341) += fb_ili9341.o
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obj-$(CONFIG_FB_TFT_ILI9481) += fb_ili9481.o
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obj-$(CONFIG_FB_TFT_ILI9486) += fb_ili9486.o
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obj-$(CONFIG_FB_TFT_PCD8544) += fb_pcd8544.o
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177
drivers/staging/fbtft/fb_pcd8544.c
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177
drivers/staging/fbtft/fb_pcd8544.c
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@ -0,0 +1,177 @@
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/*
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* FB driver for the PCD8544 LCD Controller
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*
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* The display is monochrome and the video memory is RGB565.
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* Any pixel value except 0 turns the pixel on.
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*
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* Copyright (C) 2013 Noralf Tronnes
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/gpio.h>
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#include <linux/spi/spi.h>
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#include <linux/delay.h>
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#include "fbtft.h"
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#define DRVNAME "fb_pcd8544"
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#define WIDTH 84
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#define HEIGHT 48
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#define TXBUFLEN 84*6
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#define DEFAULT_GAMMA "40" /* gamma is used to control contrast in this driver */
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static unsigned tc = 0;
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module_param(tc, uint, 0);
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MODULE_PARM_DESC(tc, "TC[1:0] Temperature coefficient: 0-3 (default: 0)");
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static unsigned bs = 4;
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module_param(bs, uint, 0);
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MODULE_PARM_DESC(bs, "BS[2:0] Bias voltage level: 0-7 (default: 4)");
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static int init_display(struct fbtft_par *par)
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{
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fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
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par->fbtftops.reset(par);
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/* Function set */
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write_reg(par, 0x21); /* 5:1 1
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2:0 PD - Powerdown control: chip is active
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1:0 V - Entry mode: horizontal addressing
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0:1 H - Extended instruction set control: extended
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*/
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/* H=1 Temperature control */
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write_reg(par, 0x04 | (tc & 0x3)); /*
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2:1 1
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1:x TC1 - Temperature Coefficient: 0x10
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0:x TC0
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*/
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/* H=1 Bias system */
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write_reg(par, 0x10 | (bs & 0x7)); /*
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4:1 1
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3:0 0
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2:x BS2 - Bias System
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1:x BS1
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0:x BS0
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*/
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/* Function set */
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write_reg(par, 0x22); /* 5:1 1
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2:0 PD - Powerdown control: chip is active
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1:1 V - Entry mode: vertical addressing
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0:0 H - Extended instruction set control: basic
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*/
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/* H=0 Display control */
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write_reg(par, 0x08 | 4); /*
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3:1 1
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2:1 D - DE: 10=normal mode
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1:0 0
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0:0 E
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*/
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return 0;
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}
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static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
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{
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fbtft_par_dbg(DEBUG_SET_ADDR_WIN, par, "%s(xs=%d, ys=%d, xe=%d, ye=%d)\n", __func__, xs, ys, xe, ye);
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/* H=0 Set X address of RAM */
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write_reg(par, 0x80); /* 7:1 1
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6-0: X[6:0] - 0x00
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*/
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/* H=0 Set Y address of RAM */
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write_reg(par, 0x40); /* 7:0 0
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6:1 1
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2-0: Y[2:0] - 0x0
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*/
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}
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static int write_vmem(struct fbtft_par *par, size_t offset, size_t len)
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{
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u16 *vmem16 = (u16 *)par->info->screen_base;
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u8 *buf = par->txbuf.buf;
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int x, y, i;
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int ret = 0;
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fbtft_par_dbg(DEBUG_WRITE_VMEM, par, "%s()\n", __func__);
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for (x=0;x<84;x++) {
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for (y=0;y<6;y++) {
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*buf = 0x00;
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for (i=0;i<8;i++) {
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*buf |= (vmem16[(y*8+i)*84+x] ? 1 : 0) << i;
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}
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buf++;
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}
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}
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/* Write data */
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gpio_set_value(par->gpio.dc, 1);
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ret = par->fbtftops.write(par, par->txbuf.buf, 6*84);
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if (ret < 0)
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dev_err(par->info->device, "%s: write failed and returned: %d\n", __func__, ret);
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return ret;
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}
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static int set_gamma(struct fbtft_par *par, unsigned long *curves)
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{
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fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
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/* apply mask */
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curves[0] &= 0x7F;
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write_reg(par, 0x23); /* turn on extended instruction set */
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write_reg(par, 0x80 | curves[0]);
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write_reg(par, 0x22); /* turn off extended instruction set */
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return 0;
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}
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static struct fbtft_display display = {
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.regwidth = 8,
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.width = WIDTH,
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.height = HEIGHT,
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.txbuflen = TXBUFLEN,
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.gamma_num = 1,
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.gamma_len = 1,
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.gamma = DEFAULT_GAMMA,
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.fbtftops = {
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.init_display = init_display,
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.set_addr_win = set_addr_win,
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.write_vmem = write_vmem,
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.set_gamma = set_gamma,
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},
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.backlight = 1,
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};
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FBTFT_REGISTER_DRIVER(DRVNAME, "philips,pdc8544", &display);
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MODULE_ALIAS("spi:" DRVNAME);
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MODULE_ALIAS("spi:pdc8544");
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MODULE_DESCRIPTION("FB driver for the PCD8544 LCD Controller");
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MODULE_AUTHOR("Noralf Tronnes");
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MODULE_LICENSE("GPL");
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