auo_k1900fb.c
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/*
* auok190xfb.c -- FB driver for AUO-K1900 controllers
*
* Copyright (C) 2011, 2012 Heiko Stuebner <heiko@sntech.de>
*
* based on broadsheetfb.c
*
* Copyright (C) 2008, Jaya Kumar
*
* 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.
*
* Layout is based on skeletonfb.c by James Simmons and Geert Uytterhoeven.
*
* This driver is written to be used with the AUO-K1900 display controller.
*
* It is intended to be architecture independent. A board specific driver
* must be used to perform all the physical IO interactions.
*
* The controller supports different update modes:
* mode0+1 16 step gray (4bit)
* mode2 4 step gray (2bit) - FIXME: add strange refresh
* mode3 2 step gray (1bit) - FIXME: add strange refresh
* mode4 handwriting mode (strange behaviour)
* mode5 automatic selection of update mode
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/list.h>
#include <linux/firmware.h>
#include <linux/gpio.h>
#include <linux/pm_runtime.h>
#include <video/auo_k190xfb.h>
#include "auo_k190x.h"
/*
* AUO-K1900 specific commands
*/
#define AUOK1900_CMD_PARTIALDISP 0x1001
#define AUOK1900_CMD_ROTATION 0x1006
#define AUOK1900_CMD_LUT_STOP 0x1009
#define AUOK1900_INIT_TEMP_AVERAGE (1 << 13)
#define AUOK1900_INIT_ROTATE(_x) ((_x & 0x3) << 10)
#define AUOK1900_INIT_RESOLUTION(_res) ((_res & 0x7) << 2)
static void auok1900_init(struct auok190xfb_par *par)
{
struct device *dev = par->info->device;
struct auok190x_board *board = par->board;
u16 init_param = 0;
pm_runtime_get_sync(dev);
init_param |= AUOK1900_INIT_TEMP_AVERAGE;
init_param |= AUOK1900_INIT_ROTATE(par->rotation);
init_param |= AUOK190X_INIT_INVERSE_WHITE;
init_param |= AUOK190X_INIT_FORMAT0;
init_param |= AUOK1900_INIT_RESOLUTION(par->resolution);
init_param |= AUOK190X_INIT_SHIFT_RIGHT;
auok190x_send_cmdargs(par, AUOK190X_CMD_INIT, 1, &init_param);
/* let the controller finish */
board->wait_for_rdy(par);
pm_runtime_mark_last_busy(dev);
pm_runtime_put_autosuspend(dev);
}
static void auok1900_update_region(struct auok190xfb_par *par, int mode,
u16 y1, u16 y2)
{
struct device *dev = par->info->device;
unsigned char *buf = (unsigned char *)par->info->screen_base;
int xres = par->info->var.xres;
int line_length = par->info->fix.line_length;
u16 args[4];
pm_runtime_get_sync(dev);
mutex_lock(&(par->io_lock));
/* y1 and y2 must be a multiple of 2 so drop the lowest bit */
y1 &= 0xfffe;
y2 &= 0xfffe;
dev_dbg(dev, "update (x,y,w,h,mode)=(%d,%d,%d,%d,%d)\n",
1, y1+1, xres, y2-y1, mode);
/* to FIX handle different partial update modes */
args[0] = mode | 1;
args[1] = y1 + 1;
args[2] = xres;
args[3] = y2 - y1;
buf += y1 * line_length;
auok190x_send_cmdargs_pixels(par, AUOK1900_CMD_PARTIALDISP, 4, args,
((y2 - y1) * line_length)/2, (u16 *) buf);
auok190x_send_command(par, AUOK190X_CMD_DATA_STOP);
par->update_cnt++;
mutex_unlock(&(par->io_lock));
pm_runtime_mark_last_busy(dev);
pm_runtime_put_autosuspend(dev);
}
static void auok1900fb_dpy_update_pages(struct auok190xfb_par *par,
u16 y1, u16 y2)
{
int mode;
if (par->update_mode < 0) {
mode = AUOK190X_UPDATE_MODE(1);
par->last_mode = -1;
} else {
mode = AUOK190X_UPDATE_MODE(par->update_mode);
par->last_mode = par->update_mode;
}
if (par->flash)
mode |= AUOK190X_UPDATE_NONFLASH;
auok1900_update_region(par, mode, y1, y2);
}
static void auok1900fb_dpy_update(struct auok190xfb_par *par)
{
int mode;
if (par->update_mode < 0) {
mode = AUOK190X_UPDATE_MODE(0);
par->last_mode = -1;
} else {
mode = AUOK190X_UPDATE_MODE(par->update_mode);
par->last_mode = par->update_mode;
}
if (par->flash)
mode |= AUOK190X_UPDATE_NONFLASH;
auok1900_update_region(par, mode, 0, par->info->var.yres);
par->update_cnt = 0;
}
static bool auok1900fb_need_refresh(struct auok190xfb_par *par)
{
return (par->update_cnt > 10);
}
static int auok1900fb_probe(struct platform_device *pdev)
{
struct auok190x_init_data init;
struct auok190x_board *board;
/* pick up board specific routines */
board = pdev->dev.platform_data;
if (!board)
return -EINVAL;
/* fill temporary init struct for common init */
init.id = "auo_k1900fb";
init.board = board;
init.update_partial = auok1900fb_dpy_update_pages;
init.update_all = auok1900fb_dpy_update;
init.need_refresh = auok1900fb_need_refresh;
init.init = auok1900_init;
return auok190x_common_probe(pdev, &init);
}
static int auok1900fb_remove(struct platform_device *pdev)
{
return auok190x_common_remove(pdev);
}
static struct platform_driver auok1900fb_driver = {
.probe = auok1900fb_probe,
.remove = auok1900fb_remove,
.driver = {
.owner = THIS_MODULE,
.name = "auo_k1900fb",
.pm = &auok190x_pm,
},
};
module_platform_driver(auok1900fb_driver);
MODULE_DESCRIPTION("framebuffer driver for the AUO-K1900 EPD controller");
MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");
MODULE_LICENSE("GPL");