2 * auok190xfb.c -- FB driver for AUO-K1900 controllers
4 * Copyright (C) 2011, 2012 Heiko Stuebner <heiko@sntech.de>
6 * based on broadsheetfb.c
8 * Copyright (C) 2008, Jaya Kumar
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.
14 * Layout is based on skeletonfb.c by James Simmons and Geert Uytterhoeven.
16 * This driver is written to be used with the AUO-K1900 display controller.
18 * It is intended to be architecture independent. A board specific driver
19 * must be used to perform all the physical IO interactions.
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
29 #include <linux/module.h>
30 #include <linux/kernel.h>
31 #include <linux/errno.h>
32 #include <linux/string.h>
34 #include <linux/slab.h>
35 #include <linux/delay.h>
36 #include <linux/interrupt.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>
45 #include <video/auo_k190xfb.h>
47 #include "auo_k190x.h"
50 * AUO-K1900 specific commands
53 #define AUOK1900_CMD_PARTIALDISP 0x1001
54 #define AUOK1900_CMD_ROTATION 0x1006
55 #define AUOK1900_CMD_LUT_STOP 0x1009
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)
61 static void auok1900_init(struct auok190xfb_par *par)
63 struct device *dev = par->info->device;
64 struct auok190x_board *board = par->board;
67 pm_runtime_get_sync(dev);
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;
76 auok190x_send_cmdargs(par, AUOK190X_CMD_INIT, 1, &init_param);
78 /* let the controller finish */
79 board->wait_for_rdy(par);
81 pm_runtime_mark_last_busy(dev);
82 pm_runtime_put_autosuspend(dev);
85 static void auok1900_update_region(struct auok190xfb_par *par, int mode,
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;
94 pm_runtime_get_sync(dev);
96 mutex_lock(&(par->io_lock));
98 /* y1 and y2 must be a multiple of 2 so drop the lowest bit */
102 dev_dbg(dev, "update (x,y,w,h,mode)=(%d,%d,%d,%d,%d)\n",
103 1, y1+1, xres, y2-y1, mode);
105 /* to FIX handle different partial update modes */
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);
117 mutex_unlock(&(par->io_lock));
119 pm_runtime_mark_last_busy(dev);
120 pm_runtime_put_autosuspend(dev);
123 static void auok1900fb_dpy_update_pages(struct auok190xfb_par *par,
128 if (par->update_mode < 0) {
129 mode = AUOK190X_UPDATE_MODE(1);
132 mode = AUOK190X_UPDATE_MODE(par->update_mode);
133 par->last_mode = par->update_mode;
137 mode |= AUOK190X_UPDATE_NONFLASH;
139 auok1900_update_region(par, mode, y1, y2);
142 static void auok1900fb_dpy_update(struct auok190xfb_par *par)
146 if (par->update_mode < 0) {
147 mode = AUOK190X_UPDATE_MODE(0);
150 mode = AUOK190X_UPDATE_MODE(par->update_mode);
151 par->last_mode = par->update_mode;
155 mode |= AUOK190X_UPDATE_NONFLASH;
157 auok1900_update_region(par, mode, 0, par->info->var.yres);
161 static bool auok1900fb_need_refresh(struct auok190xfb_par *par)
163 return (par->update_cnt > 10);
166 static int auok1900fb_probe(struct platform_device *pdev)
168 struct auok190x_init_data init;
169 struct auok190x_board *board;
171 /* pick up board specific routines */
172 board = pdev->dev.platform_data;
176 /* fill temporary init struct for common init */
177 init.id = "auo_k1900fb";
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;
184 return auok190x_common_probe(pdev, &init);
187 static int auok1900fb_remove(struct platform_device *pdev)
189 return auok190x_common_remove(pdev);
192 static struct platform_driver auok1900fb_driver = {
193 .probe = auok1900fb_probe,
194 .remove = auok1900fb_remove,
196 .owner = THIS_MODULE,
197 .name = "auo_k1900fb",
201 module_platform_driver(auok1900fb_driver);
203 MODULE_DESCRIPTION("framebuffer driver for the AUO-K1900 EPD controller");
204 MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");
205 MODULE_LICENSE("GPL");