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linux/drivers/video/auo_k1901fb.c
Heiko Stübner 53027cdf2a video: auo_k190x: add driver for AUO-K1901 variant 
This controller not only supports higher resolutions than the K1900
but concurrent updates as well. This results in a generally higher
display speed.

Signed-off-by: Heiko Stübner <heiko@sntech.de>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
2012-04-29 19:35:42 +00:00

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/*
* auok190xfb.c -- FB driver for AUO-K1901 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-K1901 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+3 4 step gray (2bit)
* mode4+5 2 step gray (1bit)
* - mode4 is described as "without LUT"
* mode7 automatic selection of update mode
*
* The most interesting difference to the K1900 is the ability to do screen
* updates in an asynchronous fashion. Where the K1900 needs to wait for the
* current update to complete, the K1901 can process later updates already.
*/
#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-K1901 specific commands
*/
#define AUOK1901_CMD_LUT_INTERFACE 0x0005
#define AUOK1901_CMD_DMA_START 0x1001
#define AUOK1901_CMD_CURSOR_START 0x1007
#define AUOK1901_CMD_CURSOR_STOP AUOK190X_CMD_DATA_STOP
#define AUOK1901_CMD_DDMA_START 0x1009
#define AUOK1901_INIT_GATE_PULSE_LOW (0 << 14)
#define AUOK1901_INIT_GATE_PULSE_HIGH (1 << 14)
#define AUOK1901_INIT_SINGLE_GATE (0 << 13)
#define AUOK1901_INIT_DOUBLE_GATE (1 << 13)
/* Bits to pixels
* Mode 15-12 11-8 7-4 3-0
* format2 2 T 1 T
* format3 1 T 2 T
* format4 T 2 T 1
* format5 T 1 T 2
*
* halftone modes:
* format6 2 2 1 1
* format7 1 1 2 2
*/
#define AUOK1901_INIT_FORMAT2 (1 << 7)
#define AUOK1901_INIT_FORMAT3 ((1 << 7) | (1 << 6))
#define AUOK1901_INIT_FORMAT4 (1 << 8)
#define AUOK1901_INIT_FORMAT5 ((1 << 8) | (1 << 6))
#define AUOK1901_INIT_FORMAT6 ((1 << 8) | (1 << 7))
#define AUOK1901_INIT_FORMAT7 ((1 << 8) | (1 << 7) | (1 << 6))
/* res[4] to bit 10
* res[3-0] to bits 5-2
*/
#define AUOK1901_INIT_RESOLUTION(_res) (((_res & (1 << 4)) << 6) \
| ((_res & 0xf) << 2))
/*
* portrait / landscape orientation in AUOK1901_CMD_DMA_START
*/
#define AUOK1901_DMA_ROTATE90(_rot) ((_rot & 1) << 13)
/*
* equivalent to 1 << 11, needs the ~ to have same rotation like K1900
*/
#define AUOK1901_DDMA_ROTATE180(_rot) ((~_rot & 2) << 10)
static void auok1901_init(struct auok190xfb_par *par)
{
struct auok190x_board *board = par->board;
u16 init_param = 0;
init_param |= AUOK190X_INIT_INVERSE_WHITE;
init_param |= AUOK190X_INIT_FORMAT0;
init_param |= AUOK1901_INIT_RESOLUTION(par->resolution);
init_param |= AUOK190X_INIT_SHIFT_LEFT;
auok190x_send_cmdargs(par, AUOK190X_CMD_INIT, 1, &init_param);
/* let the controller finish */
board->wait_for_rdy(par);
}
static void auok1901_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;
u16 args[5];
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);
/* K1901: first transfer the region data */
args[0] = AUOK1901_DMA_ROTATE90(par->rotation) | 1;
args[1] = y1 + 1;
args[2] = xres;
args[3] = y2 - y1;
buf += y1 * xres;
auok190x_send_cmdargs_pixels_nowait(par, AUOK1901_CMD_DMA_START, 4,
args, ((y2 - y1) * xres)/2,
(u16 *) buf);
auok190x_send_command_nowait(par, AUOK190X_CMD_DATA_STOP);
/* K1901: second tell the controller to update the region with mode */
args[0] = mode | AUOK1901_DDMA_ROTATE180(par->rotation);
args[1] = 1;
args[2] = y1 + 1;
args[3] = xres;
args[4] = y2 - y1;
auok190x_send_cmdargs_nowait(par, AUOK1901_CMD_DDMA_START, 5, args);
par->update_cnt++;
mutex_unlock(&(par->io_lock));
pm_runtime_mark_last_busy(dev);
pm_runtime_put_autosuspend(dev);
}
static void auok1901fb_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;
auok1901_update_region(par, mode, y1, y2);
}
static void auok1901fb_dpy_update(struct auok190xfb_par *par)
{
int mode;
/* When doing full updates, wait for the controller to be ready
* This will hopefully catch some hangs of the K1901
*/
par->board->wait_for_rdy(par);
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;
auok1901_update_region(par, mode, 0, par->info->var.yres);
par->update_cnt = 0;
}
static bool auok1901fb_need_refresh(struct auok190xfb_par *par)
{
return (par->update_cnt > 10);
}
static int __devinit auok1901fb_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_k1901fb";
init.board = board;
init.update_partial = auok1901fb_dpy_update_pages;
init.update_all = auok1901fb_dpy_update;
init.need_refresh = auok1901fb_need_refresh;
init.init = auok1901_init;
return auok190x_common_probe(pdev, &init);
}
static int __devexit auok1901fb_remove(struct platform_device *pdev)
{
return auok190x_common_remove(pdev);
}
static struct platform_driver auok1901fb_driver = {
.probe = auok1901fb_probe,
.remove = __devexit_p(auok1901fb_remove),
.driver = {
.owner = THIS_MODULE,
.name = "auo_k1901fb",
.pm = &auok190x_pm,
},
};
module_platform_driver(auok1901fb_driver);
MODULE_DESCRIPTION("framebuffer driver for the AUO-K1901 EPD controller");
MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");
MODULE_LICENSE("GPL");
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