drivers/video/auo_k1901fb.c

   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
 102 static 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
 118 static 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
 164 static 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
 183 static 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
 207 static bool auok1901fb_need_refresh(struct auok190xfb_par *par)
 208 {
 209         return (par->update_cnt > 10);
 210 }
 211
 212 static 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
 233 static int auok1901fb_remove(struct platform_device *pdev)
 234 {
 235         return auok190x_common_remove(pdev);
 236 }
 237
 238 static 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 };
 247 module_platform_driver(auok1901fb_driver);
 248
 249 MODULE_DESCRIPTION("framebuffer driver for the AUO-K1901 EPD controller");
 250 MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");
 251 MODULE_LICENSE("GPL");