tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 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
79static 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
116static 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
135static 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
154static bool auok1900fb_need_refresh(struct auok190xfb_par *par)
155{
156 return (par->update_cnt > 10);
157}
158
159static 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
180static int auok1900fb_remove(struct platform_device *pdev)
181{
182 return auok190x_common_remove(pdev);
183}
184
185static 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};
194module_platform_driver(auok1900fb_driver);
195
196MODULE_DESCRIPTION("framebuffer driver for the AUO-K1900 EPD controller");
197MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");
198MODULE_LICENSE("GPL");