linux/drivers/video/auo_k1901fb.c
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   1/*
   2 * auok190xfb.c -- FB driver for AUO-K1901 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-K1901 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+3 4 step gray (2bit)
  24 * mode4+5 2 step gray (1bit)
  25 * - mode4 is described as "without LUT"
  26 * mode7 automatic selection of update mode
  27 *
  28 * The most interesting difference to the K1900 is the ability to do screen
  29 * updates in an asynchronous fashion. Where the K1900 needs to wait for the
  30 * current update to complete, the K1901 can process later updates already.
  31 */
  32
  33#include <linux/module.h>
  34#include <linux/kernel.h>
  35#include <linux/errno.h>
  36#include <linux/string.h>
  37#include <linux/mm.h>
  38#include <linux/slab.h>
  39#include <linux/delay.h>
  40#include <linux/interrupt.h>
  41#include <linux/fb.h>
  42#include <linux/init.h>
  43#include <linux/platform_device.h>
  44#include <linux/list.h>
  45#include <linux/firmware.h>
  46#include <linux/gpio.h>
  47#include <linux/pm_runtime.h>
  48
  49#include <video/auo_k190xfb.h>
  50
  51#include "auo_k190x.h"
  52
  53/*
  54 * AUO-K1901 specific commands
  55 */
  56
  57#define AUOK1901_CMD_LUT_INTERFACE      0x0005
  58#define AUOK1901_CMD_DMA_START          0x1001
  59#define AUOK1901_CMD_CURSOR_START       0x1007
  60#define AUOK1901_CMD_CURSOR_STOP        AUOK190X_CMD_DATA_STOP
  61#define AUOK1901_CMD_DDMA_START         0x1009
  62
  63#define AUOK1901_INIT_GATE_PULSE_LOW    (0 << 14)
  64#define AUOK1901_INIT_GATE_PULSE_HIGH   (1 << 14)
  65#define AUOK1901_INIT_SINGLE_GATE       (0 << 13)
  66#define AUOK1901_INIT_DOUBLE_GATE       (1 << 13)
  67
  68/* Bits to pixels
  69 *   Mode       15-12   11-8    7-4     3-0
  70 *   format2    2       T       1       T
  71 *   format3    1       T       2       T
  72 *   format4    T       2       T       1
  73 *   format5    T       1       T       2
  74 *
  75 *   halftone modes:
  76 *   format6    2       2       1       1
  77 *   format7    1       1       2       2
  78 */
  79#define AUOK1901_INIT_FORMAT2           (1 << 7)
  80#define AUOK1901_INIT_FORMAT3           ((1 << 7) | (1 << 6))
  81#define AUOK1901_INIT_FORMAT4           (1 << 8)
  82#define AUOK1901_INIT_FORMAT5           ((1 << 8) | (1 << 6))
  83#define AUOK1901_INIT_FORMAT6           ((1 << 8) | (1 << 7))
  84#define AUOK1901_INIT_FORMAT7           ((1 << 8) | (1 << 7) | (1 << 6))
  85
  86/* res[4] to bit 10
  87 * res[3-0] to bits 5-2
  88 */
  89#define AUOK1901_INIT_RESOLUTION(_res)  (((_res & (1 << 4)) << 6) \
  90                                         | ((_res & 0xf) << 2))
  91
  92/*
  93 * portrait / landscape orientation in AUOK1901_CMD_DMA_START
  94 */
  95#define AUOK1901_DMA_ROTATE90(_rot)             ((_rot & 1) << 13)
  96
  97/*
  98 * equivalent to 1 << 11, needs the ~ to have same rotation like K1900
  99 */
 100#define AUOK1901_DDMA_ROTATE180(_rot)           ((~_rot & 2) << 10)
 101
 102static void auok1901_init(struct auok190xfb_par *par)
 103{
 104        struct auok190x_board *board = par->board;
 105        u16 init_param = 0;
 106
 107        init_param |= AUOK190X_INIT_INVERSE_WHITE;
 108        init_param |= AUOK190X_INIT_FORMAT0;
 109        init_param |= AUOK1901_INIT_RESOLUTION(par->resolution);
 110        init_param |= AUOK190X_INIT_SHIFT_LEFT;
 111
 112        auok190x_send_cmdargs(par, AUOK190X_CMD_INIT, 1, &init_param);
 113
 114        /* let the controller finish */
 115        board->wait_for_rdy(par);
 116}
 117
 118static void auok1901_update_region(struct auok190xfb_par *par, int mode,
 119                                                u16 y1, u16 y2)
 120{
 121        struct device *dev = par->info->device;
 122        unsigned char *buf = (unsigned char *)par->info->screen_base;
 123        int xres = par->info->var.xres;
 124        u16 args[5];
 125
 126        pm_runtime_get_sync(dev);
 127
 128        mutex_lock(&(par->io_lock));
 129
 130        /* y1 and y2 must be a multiple of 2 so drop the lowest bit */
 131        y1 &= 0xfffe;
 132        y2 &= 0xfffe;
 133
 134        dev_dbg(dev, "update (x,y,w,h,mode)=(%d,%d,%d,%d,%d)\n",
 135                1, y1+1, xres, y2-y1, mode);
 136
 137        /* K1901: first transfer the region data */
 138        args[0] = AUOK1901_DMA_ROTATE90(par->rotation) | 1;
 139        args[1] = y1 + 1;
 140        args[2] = xres;
 141        args[3] = y2 - y1;
 142        buf += y1 * xres;
 143        auok190x_send_cmdargs_pixels_nowait(par, AUOK1901_CMD_DMA_START, 4,
 144                                            args, ((y2 - y1) * xres)/2,
 145                                            (u16 *) buf);
 146        auok190x_send_command_nowait(par, AUOK190X_CMD_DATA_STOP);
 147
 148        /* K1901: second tell the controller to update the region with mode */
 149        args[0] = mode | AUOK1901_DDMA_ROTATE180(par->rotation);
 150        args[1] = 1;
 151        args[2] = y1 + 1;
 152        args[3] = xres;
 153        args[4] = y2 - y1;
 154        auok190x_send_cmdargs_nowait(par, AUOK1901_CMD_DDMA_START, 5, args);
 155
 156        par->update_cnt++;
 157
 158        mutex_unlock(&(par->io_lock));
 159
 160        pm_runtime_mark_last_busy(dev);
 161        pm_runtime_put_autosuspend(dev);
 162}
 163
 164static void auok1901fb_dpy_update_pages(struct auok190xfb_par *par,
 165                                                u16 y1, u16 y2)
 166{
 167        int mode;
 168
 169        if (par->update_mode < 0) {
 170                mode = AUOK190X_UPDATE_MODE(1);
 171                par->last_mode = -1;
 172        } else {
 173                mode = AUOK190X_UPDATE_MODE(par->update_mode);
 174                par->last_mode = par->update_mode;
 175        }
 176
 177        if (par->flash)
 178                mode |= AUOK190X_UPDATE_NONFLASH;
 179
 180        auok1901_update_region(par, mode, y1, y2);
 181}
 182
 183static void auok1901fb_dpy_update(struct auok190xfb_par *par)
 184{
 185        int mode;
 186
 187        /* When doing full updates, wait for the controller to be ready
 188         * This will hopefully catch some hangs of the K1901
 189         */
 190        par->board->wait_for_rdy(par);
 191
 192        if (par->update_mode < 0) {
 193                mode = AUOK190X_UPDATE_MODE(0);
 194                par->last_mode = -1;
 195        } else {
 196                mode = AUOK190X_UPDATE_MODE(par->update_mode);
 197                par->last_mode = par->update_mode;
 198        }
 199
 200        if (par->flash)
 201                mode |= AUOK190X_UPDATE_NONFLASH;
 202
 203        auok1901_update_region(par, mode, 0, par->info->var.yres);
 204        par->update_cnt = 0;
 205}
 206
 207static bool auok1901fb_need_refresh(struct auok190xfb_par *par)
 208{
 209        return (par->update_cnt > 10);
 210}
 211
 212static int auok1901fb_probe(struct platform_device *pdev)
 213{
 214        struct auok190x_init_data init;
 215        struct auok190x_board *board;
 216
 217        /* pick up board specific routines */
 218        board = pdev->dev.platform_data;
 219        if (!board)
 220                return -EINVAL;
 221
 222        /* fill temporary init struct for common init */
 223        init.id = "auo_k1901fb";
 224        init.board = board;
 225        init.update_partial = auok1901fb_dpy_update_pages;
 226        init.update_all = auok1901fb_dpy_update;
 227        init.need_refresh = auok1901fb_need_refresh;
 228        init.init = auok1901_init;
 229
 230        return auok190x_common_probe(pdev, &init);
 231}
 232
 233static int auok1901fb_remove(struct platform_device *pdev)
 234{
 235        return auok190x_common_remove(pdev);
 236}
 237
 238static struct platform_driver auok1901fb_driver = {
 239        .probe  = auok1901fb_probe,
 240        .remove = auok1901fb_remove,
 241        .driver = {
 242                .owner  = THIS_MODULE,
 243                .name   = "auo_k1901fb",
 244                .pm = &auok190x_pm,
 245        },
 246};
 247module_platform_driver(auok1901fb_driver);
 248
 249MODULE_DESCRIPTION("framebuffer driver for the AUO-K1901 EPD controller");
 250MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");
 251MODULE_LICENSE("GPL");
 252
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