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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 | |
61 | static 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 | |
79 | static 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 | |
116 | static 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 | |
135 | static 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 | |
154 | static bool auok1900fb_need_refresh(struct auok190xfb_par *par) |
155 | { |
156 | return (par->update_cnt > 10); |
157 | } |
158 | |
159 | static 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 | |
180 | static int auok1900fb_remove(struct platform_device *pdev) |
181 | { |
182 | return auok190x_common_remove(pdev); |
183 | } |
184 | |
185 | static 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 | }; |
194 | module_platform_driver(auok1900fb_driver); |
195 | |
196 | MODULE_DESCRIPTION("framebuffer driver for the AUO-K1900 EPD controller"); |
197 | MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>"); |
198 | MODULE_LICENSE("GPL"); |
199 |
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