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-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
102static 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
118static 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
164static 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
183static 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
207static bool auok1901fb_need_refresh(struct auok190xfb_par *par)
208{
209 return (par->update_cnt > 10);
210}
211
212static int __devinit 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
233static int __devexit auok1901fb_remove(struct platform_device *pdev)
234{
235 return auok190x_common_remove(pdev);
236}
237
238static struct platform_driver auok1901fb_driver = {
239 .probe = auok1901fb_probe,
240 .remove = __devexit_p(auok1901fb_remove),
241 .driver = {
242 .owner = THIS_MODULE,
243 .name = "auo_k1901fb",
244 .pm = &auok190x_pm,
245 },
246};
247module_platform_driver(auok1901fb_driver);
248
249MODULE_DESCRIPTION("framebuffer driver for the AUO-K1901 EPD controller");
250MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");
251MODULE_LICENSE("GPL");