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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - drivers/staging/fbtft/fb_uc1701.c
2 * FB driver for the UC1701 LCD Controller
4 * The display is monochrome and the video memory is RGB565.
5 * Any pixel value except 0 turns the pixel on.
7 * Copyright (C) 2014 Juergen Holzmann
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #include <linux/module.h>
25 #include <linux/kernel.h>
26 #include <linux/init.h>
27 #include <linux/gpio.h>
28 #include <linux/spi/spi.h>
29 #include <linux/delay.h>
33 #define DRVNAME "fb_uc1701"
36 #define PAGES (HEIGHT/8)
38 /* 1: Display on/off */
39 #define LCD_DISPLAY_ENABLE 0xAE
40 /* 2: display start line set */
41 #define LCD_START_LINE 0x40
42 /* 3: Page address set (lower 4 bits select one of the pages) */
43 #define LCD_PAGE_ADDRESS 0xB0
44 /* 4: column address */
45 #define LCD_COL_ADDRESS 0x10
46 /* 8: select orientation */
47 #define LCD_BOTTOMVIEW 0xA0
48 /* 9: inverted display */
49 #define LCD_DISPLAY_INVERT 0xA6
50 /* 10: show memory content or switch all pixels on */
51 #define LCD_ALL_PIXEL 0xA4
52 /* 11: lcd bias set */
54 /* 14: Reset Controller */
55 #define LCD_RESET_CMD 0xE2
56 /* 15: output mode select (turns display upside-down) */
57 #define LCD_SCAN_DIR 0xC0
58 /* 16: power control set */
59 #define LCD_POWER_CONTROL 0x28
60 /* 17: voltage regulator resistor ratio set */
61 #define LCD_VOLTAGE 0x20
62 /* 18: Volume mode set */
63 #define LCD_VOLUME_MODE 0x81
65 #define LCD_NO_OP 0xE3
66 /* 25: advanced program control */
67 #define LCD_ADV_PROG_CTRL 0xFA
68 /* 25: advanced program control2 */
69 #define LCD_ADV_PROG_CTRL2 0x10
70 #define LCD_TEMPCOMP_HIGH 0x80
71 /* column offset for normal orientation */
72 #define SHIFT_ADDR_NORMAL 0
73 /* column offset for bottom view orientation */
74 #define SHIFT_ADDR_TOPVIEW 30
77 static int init_display(struct fbtft_par
*par
)
79 fbtft_par_dbg(DEBUG_INIT_DISPLAY
, par
, "%s()\n", __func__
);
81 par
->fbtftops
.reset(par
);
83 /* softreset of LCD */
84 write_reg(par
, LCD_RESET_CMD
);
88 /* LCD_START_LINE | (pos & 0x3F) */
89 write_reg(par
, LCD_START_LINE
);
91 /* select orientation BOTTOMVIEW */
92 write_reg(par
, LCD_BOTTOMVIEW
| 1);
93 /* output mode select (turns display upside-down) */
94 write_reg(par
, LCD_SCAN_DIR
| 0x00);
96 /* Normal Pixel mode */
97 write_reg(par
, LCD_ALL_PIXEL
| 0);
99 /* positive display */
100 write_reg(par
, LCD_DISPLAY_INVERT
| 0);
103 write_reg(par
, LCD_BIAS
| 0);
105 /* power control mode: all features on */
106 /* LCD_POWER_CONTROL | (val&0x07) */
107 write_reg(par
, LCD_POWER_CONTROL
| 0x07);
109 /* set voltage regulator R/R */
110 /* LCD_VOLTAGE | (val&0x07) */
111 write_reg(par
, LCD_VOLTAGE
| 0x07);
113 /* volume mode set */
114 /* LCD_VOLUME_MODE,val&0x3f,LCD_NO_OP */
115 write_reg(par
, LCD_VOLUME_MODE
);
116 /* LCD_VOLUME_MODE,val&0x3f,LCD_NO_OP */
117 write_reg(par
, 0x09);
119 /* LCD_VOLUME_MODE,val&0x3f,LCD_NO_OP */
120 write_reg(par
, LCD_NO_OP
);
122 /* advanced program control */
123 write_reg(par
, LCD_ADV_PROG_CTRL
);
124 write_reg(par
, LCD_ADV_PROG_CTRL2
|LCD_TEMPCOMP_HIGH
);
127 write_reg(par
, LCD_DISPLAY_ENABLE
| 1);
132 static void set_addr_win(struct fbtft_par
*par
, int xs
, int ys
, int xe
, int ye
)
134 fbtft_par_dbg(DEBUG_SET_ADDR_WIN
, par
, "%s(xs=%d, ys=%d, xe=%d, ye=%d)\n", __func__
, xs
, ys
, xe
, ye
);
137 /* LCD_PAGE_ADDRESS | ((page) & 0x1F),
138 (((col)+SHIFT_ADDR_NORMAL) & 0x0F),
139 LCD_COL_ADDRESS | ((((col)+SHIFT_ADDR_NORMAL)>>4) & 0x0F) */
140 write_reg(par
, LCD_PAGE_ADDRESS
);
141 /* LCD_PAGE_ADDRESS | ((page) & 0x1F),
142 (((col)+SHIFT_ADDR_NORMAL) & 0x0F),
143 LCD_COL_ADDRESS | ((((col)+SHIFT_ADDR_NORMAL)>>4) & 0x0F) */
144 write_reg(par
, 0x00);
145 /* LCD_PAGE_ADDRESS | ((page) & 0x1F),
146 (((col)+SHIFT_ADDR_NORMAL) & 0x0F),
147 LCD_COL_ADDRESS | ((((col)+SHIFT_ADDR_NORMAL)>>4) & 0x0F) */
148 write_reg(par
, LCD_COL_ADDRESS
);
151 static int write_vmem(struct fbtft_par
*par
, size_t offset
, size_t len
)
153 u16
*vmem16
= (u16
*)par
->info
->screen_base
;
154 u8
*buf
= par
->txbuf
.buf
;
158 fbtft_par_dbg(DEBUG_WRITE_VMEM
, par
, "%s()\n", __func__
);
160 for (y
= 0; y
< PAGES
; y
++) {
161 buf
= par
->txbuf
.buf
;
162 for (x
= 0; x
< WIDTH
; x
++) {
164 for (i
= 0; i
< 8; i
++)
165 *buf
|= (vmem16
[((y
*8*WIDTH
)+(i
*WIDTH
))+x
] ? 1 : 0) << i
;
168 /* LCD_PAGE_ADDRESS | ((page) & 0x1F),
169 (((col)+SHIFT_ADDR_NORMAL) & 0x0F),
170 LCD_COL_ADDRESS | ((((col)+SHIFT_ADDR_NORMAL)>>4) & 0x0F) */
171 write_reg(par
, LCD_PAGE_ADDRESS
|(u8
)y
);
172 /* LCD_PAGE_ADDRESS | ((page) & 0x1F),
173 (((col)+SHIFT_ADDR_NORMAL) & 0x0F),
174 LCD_COL_ADDRESS | ((((col)+SHIFT_ADDR_NORMAL)>>4) & 0x0F) */
175 write_reg(par
, 0x00);
176 /* LCD_PAGE_ADDRESS | ((page) & 0x1F),
177 (((col)+SHIFT_ADDR_NORMAL) & 0x0F),
178 LCD_COL_ADDRESS | ((((col)+SHIFT_ADDR_NORMAL)>>4) & 0x0F) */
179 write_reg(par
, LCD_COL_ADDRESS
);
180 gpio_set_value(par
->gpio
.dc
, 1);
181 ret
= par
->fbtftops
.write(par
, par
->txbuf
.buf
, WIDTH
);
182 gpio_set_value(par
->gpio
.dc
, 0);
186 dev_err(par
->info
->device
, "%s: write failed and returned: %d\n", __func__
, ret
);
192 static struct fbtft_display display
= {
197 .init_display
= init_display
,
198 .set_addr_win
= set_addr_win
,
199 .write_vmem
= write_vmem
,
203 FBTFT_REGISTER_DRIVER(DRVNAME
, "UltraChip,uc1701", &display
);
205 MODULE_ALIAS("spi:" DRVNAME
);
206 MODULE_ALIAS("spi:uc1701");
208 MODULE_DESCRIPTION("FB driver for the UC1701 LCD Controller");
209 MODULE_AUTHOR("Juergen Holzmann");
210 MODULE_LICENSE("GPL");