path: root/drivers/video/auo_k190x.c

/*
 * Common code for AUO-K190X framebuffer drivers
 *
 * Copyright (C) 2012 Heiko Stuebner <heiko@sntech.de>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/gpio.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/fb.h>
#include <linux/delay.h>
#include <linux/uaccess.h>
#include <linux/vmalloc.h>
#include <linux/regulator/consumer.h>

#include <video/auo_k190xfb.h>

#include "auo_k190x.h"

struct panel_info {
	int w;
	int h;
};

/* table of panel specific parameters to be indexed into by the board drivers */
static struct panel_info panel_table[] = {
	/* standard 6" */
	[AUOK190X_RESOLUTION_800_600] = {
		.w = 800,
		.h = 600,
	},
	/* standard 9" */
	[AUOK190X_RESOLUTION_1024_768] = {
		.w = 1024,
		.h = 768,
	},
};

/*
 * private I80 interface to the board driver
 */

static void auok190x_issue_data(struct auok190xfb_par *par, u16 data)
{
	par->board->set_ctl(par, AUOK190X_I80_WR, 0);
	par->board->set_hdb(par, data);
	par->board->set_ctl(par, AUOK190X_I80_WR, 1);
}

static void auok190x_issue_cmd(struct auok190xfb_par *par, u16 data)
{
	par->board->set_ctl(par, AUOK190X_I80_DC, 0);
	auok190x_issue_data(par, data);
	par->board->set_ctl(par, AUOK190X_I80_DC, 1);
}

static int auok190x_issue_pixels(struct auok190xfb_par *par, int size,
				 u16 *data)
{
	struct device *dev = par->info->device;
	int i;
	u16 tmp;

	if (size & 3) {
		dev_err(dev, "issue_pixels: size %d must be a multiple of 4\n",
			size);
		return -EINVAL;
	}

	for (i = 0; i < (size >> 1); i++) {
		par->board->set_ctl(par, AUOK190X_I80_WR, 0);

		/* simple reduction of 8bit staticgray to 4bit gray
		 * combines 4 * 4bit pixel values into a 16bit value
		 */
		tmp  = (data[2*i] & 0xF0) >> 4;
		tmp |= (data[2*i] & 0xF000) >> 8;
		tmp |= (data[2*i+1] & 0xF0) << 4;
		tmp |= (data[2*i+1] & 0xF000);

		par->board->set_hdb(par, tmp);
		par->board->set_ctl(par, AUOK190X_I80_WR, 1);
	}

	return 0;
}

static u16 auok190x_read_data(struct auok190xfb_par *par)
{
	u16 data;

	par->board->set_ctl(par, AUOK190X_I80_OE, 0);
	data = par->board->get_hdb(par);
	par->board->set_ctl(par, AUOK190X_I80_OE, 1);

	return data;
}

/*
 * Command interface for the controller drivers
 */

void auok190x_send_command_nowait(struct auok190xfb_par *par, u16 data)
{
	par->board->set_ctl(par, AUOK190X_I80_CS, 0);
	auok190x_issue_cmd(par, data);
	par->board->set_ctl(par, AUOK190X_I80_CS, 1);
}
EXPORT_SYMBOL_GPL(auok190x_send_command_nowait);

void auok190x_send_cmdargs_nowait(struct auok190xfb_par *par, u16 cmd,
				  int argc, u16 *argv)
{
	int i;

	par->board->set_ctl(par, AUOK190X_I80_CS, 0);
	auok190x_issue_cmd(par, cmd);

	for (i = 0; i < argc; i++)
		auok190x_issue_data(par, argv[i]);
	par->board->set_ctl(par, AUOK190X_I80_CS, 1);
}
EXPORT_SYMBOL_GPL(auok190x_send_cmdargs_nowait);

int auok190x_send_command(struct auok190xfb_par *par, u16 data)
{
	int ret;

	ret = par->board->wait_for_rdy(par);
	if (ret