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 device *dev = par->info->device;
  64        struct auok190x_board *board = par->board;
  65        u16 init_param = 0;
  66
  67        pm_runtime_get_sync(dev);
  68
  69        init_param |= AUOK1900_INIT_TEMP_AVERAGE;
  70        init_param |= AUOK1900_INIT_ROTATE(par->rotation);
  71        init_param |= AUOK190X_INIT_INVERSE_WHITE;
  72        init_param |= AUOK190X_INIT_FORMAT0;
  73        init_param |= AUOK1900_INIT_RESOLUTION(par->resolution);
  74        init_param |= AUOK190X_INIT_SHIFT_RIGHT;
  75
  76        auok190x_send_cmdargs(par, AUOK190X_CMD_INIT, 1, &init_param);
  77
  78        /* let the controller finish */
  79        board->wait_for_rdy(par);
  80
  81        pm_runtime_mark_last_busy(dev);
  82        pm_runtime_put_autosuspend(dev);
  83}
  84
  85static void auok1900_update_region(struct auok190xfb_par *par, int mode,
  86                                                u16 y1, u16 y2)
  87{
  88        struct device *dev = par->info->device;
  89        unsigned char *buf = (unsigned char *)par->info->screen_base;
  90        int xres = par->info->var.xres;
  91        int line_length = par->info->fix.line_length;
  92        u16 args[4];
  93
  94        pm_runtime_get_sync(dev);
  95
  96        mutex_lock(&(par->io_lock));
  97
  98        /* y1 and y2 must be a multiple of 2 so drop the lowest bit */
  99        y1 &= 0xfffe;
 100        y2 &= 0xfffe;
 101
 102        dev_dbg(dev, "update (x,y,w,h,mode)=(%d,%d,%d,%d,%d)\n",
 103                1, y1+1, xres, y2-y1, mode);
 104
 105        /* to FIX handle different partial update modes */
 106        args[0] = mode | 1;
 107        args[1] = y1 + 1;
 108        args[2] = xres;
 109        args[3] = y2 - y1;
 110        buf += y1 * line_length;
 111        auok190x_send_cmdargs_pixels(par, AUOK1900_CMD_PARTIALDISP, 4, args,
 112                                     ((y2 - y1) * line_length)/2, (u16 *) buf);
 113        auok190x_send_command(par, AUOK190X_CMD_DATA_STOP);
 114
 115        par->update_cnt++;
 116
 117        mutex_unlock(&(par->io_lock));
 118
 119        pm_runtime_mark_last_busy(dev);
 120        pm_runtime_put_autosuspend(dev);
 121}
 122
 123static void auok1900fb_dpy_update_pages(struct auok190xfb_par *par,
 124                                                u16 y1, u16 y2)
 125{
 126        int mode;
 127
 128        if (par->update_mode < 0) {
 129                mode = AUOK190X_UPDATE_MODE(1);
 130                par->last_mode = -1;
 131        } else {
 132                mode = AUOK190X_UPDATE_MODE(par->update_mode);
 133                par->last_mode = par->update_mode;
 134        }
 135
 136        if (par->flash)
 137                mode |= AUOK190X_UPDATE_NONFLASH;
 138
 139        auok1900_update_region(par, mode, y1, y2);
 140}
 141
 142static void auok1900fb_dpy_update(struct auok190xfb_par *par)
 143{
 144        int mode;
 145
 146        if (par->update_mode < 0) {
 147                mode = AUOK190X_UPDATE_MODE(0);
 148                par->last_mode = -1;
 149        } else {
 150                mode = AUOK190X_UPDATE_MODE(par->update_mode);
 151                par->last_mode = par->update_mode;
 152        }
 153
 154        if (par->flash)
 155                mode |= AUOK190X_UPDATE_NONFLASH;
 156
 157        auok1900_update_region(par, mode, 0, par->info->var.yres);
 158        par->update_cnt = 0;
 159}
 160
 161static bool auok1900fb_need_refresh(struct auok190xfb_par *par)
 162{
 163        return (par->update_cnt > 10);
 164}
 165
 166static int auok1900fb_probe(struct platform_device *pdev)
 167{
 168        struct auok190x_init_data init;
 169        struct auok190x_board *board;
 170
 171        /* pick up board specific routines */
 172        board = pdev->dev.platform_data;
 173        if (!board)
 174                return -EINVAL;
 175
 176        /* fill temporary init struct for common init */
 177        init.id = "auo_k1900fb";
 178        init.board = board;
 179        init.update_partial = auok1900fb_dpy_update_pages;
 180        init.update_all = auok1900fb_dpy_update;
 181        init.need_refresh = auok1900fb_need_refresh;
 182        init.init = auok1900_init;
 183
 184        return auok190x_common_probe(pdev, &init);
 185}
 186
 187static int auok1900fb_remove(struct platform_device *pdev)
 188{
 189        return auok190x_common_remove(pdev);
 190}
 191
 192static struct platform_driver auok1900fb_driver = {
 193        .probe  = auok1900fb_probe,
 194        .remove = auok1900fb_remove,
 195        .driver = {
 196                .owner  = THIS_MODULE,
 197                .name   = "auo_k1900fb",
 198                .pm = &auok190x_pm,
 199        },
 200};
 201module_platform_driver(auok1900fb_driver);
 202
 203MODULE_DESCRIPTION("framebuffer driver for the AUO-K1900 EPD controller");
 204MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");
 205MODULE_LICENSE("GPL");
 206
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