staging: fbtft: add fb_tls8204 driver (9518dbc0) · Commits · e / devices / android_kernel_teracube_2e

drivers/staging/fbtft/Kconfig

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Original line number	Original line	Diff line number	Diff line
	@@ -133,3 +133,9 @@ config FB_TFT_TINYLCD
	depends on FB_TFT		depends on FB_TFT
	help		help
	Custom Framebuffer support for tinylcd.com display		Custom Framebuffer support for tinylcd.com display

			config FB_TFT_TLS8204
			tristate "FB driver for the TLS8204 LCD Controller"
			depends on FB_TFT
			help
			Generic Framebuffer support for TLS8204

drivers/staging/fbtft/Makefile

+1 −0

Original line number	Original line	Diff line number	Diff line
	@@ -24,3 +24,4 @@ obj-$(CONFIG_FB_TFT_SSD1331) += fb_ssd1331.o
	obj-$(CONFIG_FB_TFT_SSD1351) += fb_ssd1351.o		obj-$(CONFIG_FB_TFT_SSD1351) += fb_ssd1351.o
	obj-$(CONFIG_FB_TFT_ST7735R) += fb_st7735r.o		obj-$(CONFIG_FB_TFT_ST7735R) += fb_st7735r.o
	obj-$(CONFIG_FB_TFT_TINYLCD) += fb_tinylcd.o		obj-$(CONFIG_FB_TFT_TINYLCD) += fb_tinylcd.o
			obj-$(CONFIG_FB_TFT_TLS8204) += fb_tls8204.o

drivers/staging/fbtft/fb_tls8204.c

0 → 100644

+176 −0

Original line number	Original line	Diff line number	Diff line
			/*
			* FB driver for the TLS8204 LCD Controller
			*
			* The display is monochrome and the video memory is RGB565.
			* Any pixel value except 0 turns the pixel on.
			*
			* Copyright (C) 2013 Noralf Tronnes
			* Copyright (C) 2014 Michael Hope (adapted for the TLS8204)
			*
			* 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_tls8204"
			#define WIDTH 84
			#define HEIGHT 48
			#define TXBUFLEN WIDTH
			#define DEFAULT_GAMMA "40" /* gamma is used to control contrast in this driver */

			static unsigned bs = 4;
			module_param(bs, uint, 0);
			MODULE_PARM_DESC(bs, "BS[2:0] Bias voltage level: 0-7 (default: 4)");

			static int init_display(struct fbtft_par *par)
			{
			fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);

			par->fbtftops.reset(par);

			/* Enter extended command mode */
			write_reg(par, 0x21); /* 5:1 1
			2:0 PD - Powerdown control: chip is active
			1:0 V - Entry mode: horizontal addressing
			0:1 H - Extended instruction set control: extended
			*/

			/* H=1 Bias system */
			write_reg(par, 0x10 \| (bs & 0x7)); /*
			4:1 1
			3:0 0
			2:x BS2 - Bias System
			1:x BS1
			0:x BS0
			*/

			/* Set the address of the first display line. */
			write_reg(par, 0x04 \| (64 >> 6));
			write_reg(par, 0x40 \| (64 & 0x3F));

			/* Enter H=0 standard command mode */
			write_reg(par, 0x20);

			/* H=0 Display control */
			write_reg(par, 0x08 \| 4); /*
			3:1 1
			2:1 D - DE: 10=normal mode
			1:0 0
			0:0 E
			*/

			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);

			/* H=0 Set X address of RAM */
			write_reg(par, 0x80); /* 7:1 1
			6-0: X[6:0] - 0x00
			*/

			/* H=0 Set Y address of RAM */
			write_reg(par, 0x40); /* 7:0 0
			6:1 1
			2-0: Y[2:0] - 0x0
			*/
			}

			static int write_vmem(struct fbtft_par *par, size_t offset, size_t len)
			{
			u16 vmem16 = (u16 )par->info->screen_base;
			int x, y, i;
			int ret = 0;

			fbtft_par_dbg(DEBUG_WRITE_VMEM, par, "%s()\n", __func__);

			for (y = 0; y < HEIGHT/8; y++) {
			u8 *buf = par->txbuf.buf;
			/* The display is 102x68 but the LCD is 84x48. Set
			the write pointer at the start of each row. */
			gpio_set_value(par->gpio.dc, 0);
			write_reg(par, 0x80 \| 0);
			write_reg(par, 0x40 \| y);

			for (x = 0; x < WIDTH; x++) {
			u8 ch = 0;
			for (i = 0; i < 8*WIDTH; i += WIDTH) {
			ch >>= 1;
			if (vmem16[(y8WIDTH)+i+x])
			ch \|= 0x80;
			}
			*buf++ = ch;
			}
			/* Write the row */
			gpio_set_value(par->gpio.dc, 1);
			ret = par->fbtftops.write(par, par->txbuf.buf, WIDTH);
			if (ret < 0) {
			dev_err(par->info->device,
			"%s: write failed and returned: %d\n", __func__, ret);
			break;
			}
			}

			return ret;
			}

			static int set_gamma(struct fbtft_par par, unsigned long curves)
			{
			fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);

			/* apply mask */
			curves[0] &= 0x7F;

			write_reg(par, 0x21); /* turn on extended instruction set */
			write_reg(par, 0x80 \| curves[0]);
			write_reg(par, 0x20); /* turn off extended instruction set */

			return 0;
			}


			static struct fbtft_display display = {
			.regwidth = 8,
			.width = WIDTH,
			.height = HEIGHT,
			.txbuflen = TXBUFLEN,
			.gamma_num = 1,
			.gamma_len = 1,
			.gamma = DEFAULT_GAMMA,
			.fbtftops = {
			.init_display = init_display,
			.set_addr_win = set_addr_win,
			.write_vmem = write_vmem,
			.set_gamma = set_gamma,
			},
			.backlight = 1,
			};
			FBTFT_REGISTER_DRIVER(DRVNAME, "teralane,tls8204", &display);

			MODULE_ALIAS("spi:" DRVNAME);
			MODULE_ALIAS("spi:tls8204");

			MODULE_DESCRIPTION("FB driver for the TLS8204 LCD Controller");
			MODULE_AUTHOR("Michael Hope");
			MODULE_LICENSE("GPL");