linux/drivers/video/auo_k1900fb.c
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   1/*
   2 * auok190xfb.c -- FB driver for AUO-K1900 controllers
   3 *
   4 * Copyright (C) 2011, 2012 Heiko Stuebner <heiko@sntech.de>
   5 *
   6 * based on broadsheetfb.c
   7 *
   8 * Copyright (C) 2008, Jaya Kumar
   9 *
  10 * This program is free software; you can redistribute it and/or modify
  11 * it under the terms of the GNU General Public License version 2 as
  12 * published by the Free Software Foundation.
  13 *
  14 * Layout is based on skeletonfb.c by James Simmons and Geert Uytterhoeven.
  15 *
  16 * This driver is written to be used with the AUO-K1900 display controller.
  17 *
  18 * It is intended to be architecture independent. A board specific driver
  19 * must be used to perform all the physical IO interactions.
  20 *
  21 * The controller supports different update modes:
  22 * mode0+1 16 step gray (4bit)
  23 * mode2 4 step gray (2bit) - FIXME: add strange refresh
  24 * mode3 2 step gray (1bit) - FIXME: add strange refresh
  25 * mode4 handwriting mode (strange behaviour)
  26 * mode5 automatic selection of update mode
  27 */
  28
  29#include <linux/module.h>
  30#include <linux/kernel.h>
  31#include <linux/errno.h>
  32#include <linux/string.h>
  33#include <linux/mm.h>
  34#include <linux/slab.h>
  35#include <linux/delay.h>
  36#include <linux/interrupt.h>
  37#include <linux/fb.h>
  38#include <linux/init.h>
  39#include <linux/platform_device.h>
  40#include <linux/list.h>
  41#include <linux/firmware.h>
  42#include <linux/gpio.h>
  43#include <linux/pm_runtime.h>
  44
  45#include <video/auo_k190xfb.h>
  46
  47#include "auo_k190x.h"
  48
  49/*
  50 * AUO-K1900 specific commands
  51 */
  52
  53#define AUOK1900_CMD_PARTIALDISP        0x1001
  54#define AUOK1900_CMD_ROTATION           0x1006
  55#define AUOK1900_CMD_LUT_STOP           0x1009
  56
  57#define AUOK1900_INIT_TEMP_AVERAGE      (1 << 13)
  58#define AUOK1900_INIT_ROTATE(_x)        ((_x & 0x3) << 10)
  59#define AUOK1900_INIT_RESOLUTION(_res)  ((_res & 0x7) << 2)
  60
  61static void auok1900_init(struct auok190xfb_par *par)
  62{
  63        struct auok190x_board *board = par->board;
  64        u16 init_param = 0;
  65
  66        init_param |= AUOK1900_INIT_TEMP_AVERAGE;
  67        init_param |= AUOK1900_INIT_ROTATE(par->rotation);
  68        init_param |= AUOK190X_INIT_INVERSE_WHITE;
  69        init_param |= AUOK190X_INIT_FORMAT0;
  70        init_param |= AUOK1900_INIT_RESOLUTION(par->resolution);
  71        init_param |= AUOK190X_INIT_SHIFT_RIGHT;
  72
  73        auok190x_send_cmdargs(par, AUOK190X_CMD_INIT, 1, &init_param);
  74
  75        /* let the controller finish */
  76        board->wait_for_rdy(par);
  77}
  78
  79static void auok1900_update_region(struct auok190xfb_par *par, int mode,
  80                                                u16 y1, u16 y2)
  81{
  82        struct device *dev = par->info->device;
  83        unsigned char *buf = (unsigned char *)par->info->screen_base;
  84        int xres = par->info->var.xres;
  85        u16 args[4];
  86
  87        pm_runtime_get_sync(dev);
  88
  89        mutex_lock(&(par->io_lock));
  90
  91        /* y1 and y2 must be a multiple of 2 so drop the lowest bit */
  92        y1 &= 0xfffe;
  93        y2 &= 0xfffe;
  94
  95        dev_dbg(dev, "update (x,y,w,h,mode)=(%d,%d,%d,%d,%d)\n",
  96                1, y1+1, xres, y2-y1, mode);
  97
  98        /* to FIX handle different partial update modes */
  99        args[0] = mode | 1;
 100        args[1] = y1 + 1;
 101        args[2] = xres;
 102        args[3] = y2 - y1;
 103        buf += y1 * xres;
 104        auok190x_send_cmdargs_pixels(par, AUOK1900_CMD_PARTIALDISP, 4, args,
 105                                     ((y2 - y1) * xres)/2, (u16 *) buf);
 106        auok190x_send_command(par, AUOK190X_CMD_DATA_STOP);
 107
 108        par->update_cnt++;
 109
 110        mutex_unlock(&(par->io_lock));
 111
 112        pm_runtime_mark_last_busy(dev);
 113        pm_runtime_put_autosuspend(dev);
 114}
 115
 116static void auok1900fb_dpy_update_pages(struct auok190xfb_par *par,
 117                                                u16 y1, u16 y2)
 118{
 119        int mode;
 120
 121        if (par->update_mode < 0) {
 122                mode = AUOK190X_UPDATE_MODE(1);
 123                par->last_mode = -1;
 124        } else {
 125                mode = AUOK190X_UPDATE_MODE(par->update_mode);
 126                par->last_mode = par->update_mode;
 127        }
 128
 129        if (par->flash)
 130                mode |= AUOK190X_UPDATE_NONFLASH;
 131
 132        auok1900_update_region(par, mode, y1, y2);
 133}
 134
 135static void auok1900fb_dpy_update(struct auok190xfb_par *par)
 136{
 137        int mode;
 138
 139        if (par->update_mode < 0) {
 140                mode = AUOK190X_UPDATE_MODE(0);
 141                par->last_mode = -1;
 142        } else {
 143                mode = AUOK190X_UPDATE_MODE(par->update_mode);
 144                par->last_mode = par->update_mode;
 145        }
 146
 147        if (par->flash)
 148                mode |= AUOK190X_UPDATE_NONFLASH;
 149
 150        auok1900_update_region(par, mode, 0, par->info->var.yres);
 151        par->update_cnt = 0;
 152}
 153
 154static bool auok1900fb_need_refresh(struct auok190xfb_par *par)
 155{
 156        return (par->update_cnt > 10);
 157}
 158
 159static int __devinit auok1900fb_probe(struct platform_device *pdev)
 160{
 161        struct auok190x_init_data init;
 162        struct auok190x_board *board;
 163
 164        /* pick up board specific routines */
 165        board = pdev->dev.platform_data;
 166        if (!board)
 167                return -EINVAL;
 168
 169        /* fill temporary init struct for common init */
 170        init.id = "auo_k1900fb";
 171        init.board = board;
 172        init.update_partial = auok1900fb_dpy_update_pages;
 173        init.update_all = auok1900fb_dpy_update;
 174        init.need_refresh = auok1900fb_need_refresh;
 175        init.init = auok1900_init;
 176
 177        return auok190x_common_probe(pdev, &init);
 178}
 179
 180static int __devexit auok1900fb_remove(struct platform_device *pdev)
 181{
 182        return auok190x_common_remove(pdev);
 183}
 184
 185static struct platform_driver auok1900fb_driver = {
 186        .probe  = auok1900fb_probe,
 187        .remove = __devexit_p(auok1900fb_remove),
 188        .driver = {
 189                .owner  = THIS_MODULE,
 190                .name   = "auo_k1900fb",
 191                .pm = &auok190x_pm,
 192        },
 193};
 194module_platform_driver(auok1900fb_driver);
 195
 196MODULE_DESCRIPTION("framebuffer driver for the AUO-K1900 EPD controller");
 197MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");
 198MODULE_LICENSE("GPL");
 199
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