aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/video/fbdev/auo_k1901fb.c
blob: 12b9adcb75c54757155509ed2734ced2a6218c00 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
/*
 * auok190xfb.c -- FB driver for AUO-K1901 controllers
 *
 * Copyright (C) 2011, 2012 Heiko Stuebner <heiko@sntech.de>
 *
 * based on broadsheetfb.c
 *
 * Copyright (C) 2008, Jaya Kumar
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Layout is based on skeletonfb.c by James Simmons and Geert Uytterhoeven.
 *
 * This driver is written to be used with the AUO-K1901 display controller.
 *
 * It is intended to be architecture independent. A board specific driver
 * must be used to perform all the physical IO interactions.
 *
 * The controller supports different update modes:
 * mode0+1 16 step gray (4bit)
 * mode2+3 4 step gray (2bit)
 * mode4+5 2 step gray (1bit)
 * - mode4 is described as "without LUT"
 * mode7 automatic selection of update mode
 *
 * The most interesting difference to the K1900 is the ability to do screen
 * updates in an asynchronous fashion. Where the K1900 needs to wait for the
 * current update to complete, the K1901 can process later updates already.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/list.h>
#include <linux/firmware.h>
#include <linux/gpio.h>
#include <linux/pm_runtime.h>

#include <video/auo_k190xfb.h>

#include "auo_k190x.h"

/*
 * AUO-K1901 specific commands
 */

#define AUOK1901_CMD_LUT_INTERFACE	0x0005
#define AUOK1901_CMD_DMA_START		0x1001
#define AUOK1901_CMD_CURSOR_START	0x1007
#define AUOK1901_CMD_CURSOR_STOP	AUOK190X_CMD_DATA_STOP
#define AUOK1901_CMD_DDMA_START		0x1009

#define AUOK1901_INIT_GATE_PULSE_LOW	(0 << 14)
#define AUOK1901_INIT_GATE_PULSE_HIGH	(1 << 14)
#define AUOK1901_INIT_SINGLE_GATE	(0 << 13)
#define AUOK1901_INIT_DOUBLE_GATE	(1 << 13)

/* Bits to pixels
 *   Mode	15-12	11-8	7-4	3-0
 *   format2	2	T	1	T
 *   format3	1	T	2	T
 *   format4	T	2	T	1
 *   format5	T	1	T	2
 *
 *   halftone modes:
 *   format6	2	2	1	1
 *   format7	1	1	2	2
 */
#define AUOK1901_INIT_FORMAT2		(1 << 7)
#define AUOK1901_INIT_FORMAT3		((1 << 7) | (1 << 6))
#define AUOK1901_INIT_FORMAT4		(1 << 8)
#define AUOK1901_INIT_FORMAT5		((1 << 8) | (1 << 6))
#define AUOK1901_INIT_FORMAT6		((1 << 8) | (1 << 7))
#define AUOK1901_INIT_FORMAT7		((1 << 8) | (1 << 7) | (1 << 6))

/* res[4] to bit 10
 * res[3-0] to bits 5-2
 */
#define AUOK1901_INIT_RESOLUTION(_res)	(((_res & (1 << 4)) << 6) \
					 | ((_res & 0xf) << 2))

/*
 * portrait / landscape orientation in AUOK1901_CMD_DMA_START
 */
#define AUOK1901_DMA_ROTATE90(_rot)		((_rot & 1) << 13)

/*
 * equivalent to 1 << 11, needs the ~ to have same rotation like K1900
 */
#define AUOK1901_DDMA_ROTATE180(_rot)		((~_rot & 2) << 10)

static void auok1901_init(struct auok190xfb_par *par)
{
	struct device *dev = par->info->device;
	struct auok190x_board *board = par->board;
	u16 init_param = 0;

	pm_runtime_get_sync(dev);

	init_param |= AUOK190X_INIT_INVERSE_WHITE;
	init_param |= AUOK190X_INIT_FORMAT0;
	init_param |= AUOK1901_INIT_RESOLUTION(par->resolution);
	init_param |= AUOK190X_INIT_SHIFT_LEFT;

	auok190x_send_cmdargs(par, AUOK190X_CMD_INIT, 1, &init_param);

	/* let the controller finish */
	board->wait_for_rdy(par);

	pm_runtime_mark_last_busy(dev);
	pm_runtime_put_autosuspend(dev);
}

static void auok1901_update_region(struct auok190xfb_par *par, int mode,
						u16 y1, u16 y2)
{
	struct device *dev = par->info->device;
	unsigned char *buf = (unsigned char *)par->info->screen_base;
	int xres = par->info->var.xres;
	int line_length = par->info->fix.line_length;
	u16 args[5];

	pm_runtime_get_sync(dev);

	mutex_lock(&(par->io_lock));

	/* y1 and y2 must be a multiple of 2 so drop the lowest bit */
	y1 &= 0xfffe;
	y2 &= 0xfffe;

	dev_dbg(dev, "update (x,y,w,h,mode)=(%d,%d,%d,%d,%d)\n",
		1, y1+1, xres, y2-y1, mode);

	/* K1901: first transfer the region data */
	args[0] = AUOK1901_DMA_ROTATE90(par->rotation) | 1;
	args[1] = y1 + 1;
	args[2] = xres;
	args[3] = y2 - y1;
	buf += y1 * line_length;
	auok190x_send_cmdargs_pixels_nowait(par, AUOK1901_CMD_DMA_START, 4,
					    args, ((y2 - y1) * line_length)/2,
					    (u16 *) buf);
	auok190x_send_command_nowait(par, AUOK190X_CMD_DATA_STOP);

	/* K1901: second tell the controller to update the region with mode */
	args[0] = mode | AUOK1901_DDMA_ROTATE180(par->rotation);
	args[1] = 1;
	args[2] = y1 + 1;
	args[3] = xres;
	args[4] = y2 - y1;
	auok190x_send_cmdargs_nowait(par, AUOK1901_CMD_DDMA_START, 5, args);

	par->update_cnt++;

	mutex_unlock(&(par->io_lock));

	pm_runtime_mark_last_busy(dev);
	pm_runtime_put_autosuspend(dev);
}

static void auok1901fb_dpy_update_pages(struct auok190xfb_par *par,
						u16 y1, u16 y2)
{
	int mode;

	if (par->update_mode < 0) {
		mode = AUOK190X_UPDATE_MODE(1);
		par->last_mode = -1;
	} else {
		mode = AUOK190X_UPDATE_MODE(par->update_mode);
		par->last_mode = par->update_mode;
	}

	if (par->flash)
		mode |= AUOK190X_UPDATE_NONFLASH;

	auok1901_update_region(par, mode, y1, y2);
}

static void auok1901fb_dpy_update(struct auok190xfb_par *par)
{
	int mode;

	/* When doing full updates, wait for the controller to be ready
	 * This will hopefully catch some hangs of the K1901
	 */
	par->board->wait_for_rdy(par);

	if (par->update_mode < 0) {
		mode = AUOK190X_UPDATE_MODE(0);
		par->last_mode = -1;
	} else {
		mode = AUOK190X_UPDATE_MODE(par->update_mode);
		par->last_mode = par->update_mode;
	}

	if (par->flash)
		mode |= AUOK190X_UPDATE_NONFLASH;

	auok1901_update_region(par, mode, 0, par->info->var.yres);
	par->update_cnt = 0;
}

static bool auok1901fb_need_refresh(struct auok190xfb_par *par)
{
	return (par->update_cnt > 10);
}

static int auok1901fb_probe(struct platform_device *pdev)
{
	struct auok190x_init_data init;
	struct auok190x_board *board;

	/* pick up board specific routines */
	board = pdev->dev.platform_data;
	if (!board)
		return -EINVAL;

	/* fill temporary init struct for common init */
	init.id = "auo_k1901fb";
	init.board = board;
	init.update_partial = auok1901fb_dpy_update_pages;
	init.update_all = auok1901fb_dpy_update;
	init.need_refresh = auok1901fb_need_refresh;
	init.init = auok1901_init;

	return auok190x_common_probe(pdev, &init);
}

static int auok1901fb_remove(struct platform_device *pdev)
{
	return auok190x_common_remove(pdev);
}

static struct platform_driver auok1901fb_driver = {
	.probe	= auok1901fb_probe,
	.remove = auok1901fb_remove,
	.driver	= {
		.owner	= THIS_MODULE,
		.name	= "auo_k1901fb",
		.pm = &auok190x_pm,
	},
};
module_platform_driver(auok1901fb_driver);

MODULE_DESCRIPTION("framebuffer driver for the AUO-K1901 EPD controller");
MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");
MODULE_LICENSE("GPL");