drivers/video/auo_k1900fb.c

   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
  61 static 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
  79 static 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
 116 static 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
 135 static 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
 154 static bool auok1900fb_need_refresh(struct auok190xfb_par *par)
 155 {
 156         return (par->update_cnt > 10);
 157 }
 158
 159 static int 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
 180 static int auok1900fb_remove(struct platform_device *pdev)
 181 {
 182         return auok190x_common_remove(pdev);
 183 }
 184
 185 static struct platform_driver auok1900fb_driver = {
 186         .probe  = auok1900fb_probe,
 187         .remove = auok1900fb_remove,
 188         .driver = {
 189                 .owner  = THIS_MODULE,
 190                 .name   = "auo_k1900fb",
 191                 .pm = &auok190x_pm,
 192         },
 193 };
 194 module_platform_driver(auok1900fb_driver);
 195
 196 MODULE_DESCRIPTION("framebuffer driver for the AUO-K1900 EPD controller");
 197 MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");
 198 MODULE_LICENSE("GPL");