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authorJaya Kumar <jayakumar.lkml@gmail.com>2008-04-28 05:15:40 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-28 11:58:41 -0400
commit0e27aa3dabb541edee9f23b37114856a528de01e (patch)
tree5516f7e6445f0bd95a1e4bbca2c3c678643b28a4 /drivers/video/n411.c
parent2422fbba0684ddf08898ec2f3cf23cb16a54b3f5 (diff)
fbdev: platforming hecubafb and n411
This patch splits hecubafb into the platform independent hecubafb and the platform dependent n411. Signed-off-by: Jaya Kumar <jayakumar.lkml@gmail.com> Cc: "Antonino A. Daplas" <adaplas@pol.net> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/video/n411.c')
-rw-r--r--drivers/video/n411.c202
1 files changed, 202 insertions, 0 deletions
diff --git a/drivers/video/n411.c b/drivers/video/n411.c
new file mode 100644
index 000000000000..935830fea7b6
--- /dev/null
+++ b/drivers/video/n411.c
@@ -0,0 +1,202 @@
1/*
2 * linux/drivers/video/n411.c -- Platform device for N411 EPD kit
3 *
4 * Copyright (C) 2008, Jaya Kumar
5 *
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file COPYING in the main directory of this archive for
8 * more details.
9 *
10 * Layout is based on skeletonfb.c by James Simmons and Geert Uytterhoeven.
11 *
12 * This driver is written to be used with the Hecuba display controller
13 * board, and tested with the EInk 800x600 display in 1 bit mode.
14 * The interface between Hecuba and the host is TTL based GPIO. The
15 * GPIO requirements are 8 writable data lines and 6 lines for control.
16 * Only 4 of the controls are actually used here but 6 for future use.
17 * The driver requires the IO addresses for data and control GPIO at
18 * load time. It is also possible to use this display with a standard
19 * PC parallel port.
20 *
21 * General notes:
22 * - User must set dio_addr=0xIOADDR cio_addr=0xIOADDR c2io_addr=0xIOADDR
23 *
24 */
25
26#include <linux/module.h>
27#include <linux/kernel.h>
28#include <linux/errno.h>
29#include <linux/string.h>
30#include <linux/delay.h>
31#include <linux/interrupt.h>
32#include <linux/fb.h>
33#include <linux/init.h>
34#include <linux/platform_device.h>
35#include <linux/list.h>
36#include <linux/uaccess.h>
37#include <linux/irq.h>
38
39#include <video/hecubafb.h>
40
41static unsigned long dio_addr;
42static unsigned long cio_addr;
43static unsigned long c2io_addr;
44static unsigned long splashval;
45static unsigned int nosplash;
46static unsigned char ctl;
47
48static void n411_set_ctl(struct hecubafb_par *par, unsigned char bit, unsigned
49 char state)
50{
51 switch (bit) {
52 case HCB_CD_BIT:
53 if (state)
54 ctl &= ~(HCB_CD_BIT);
55 else
56 ctl |= HCB_CD_BIT;
57 break;
58 case HCB_DS_BIT:
59 if (state)
60 ctl &= ~(HCB_DS_BIT);
61 else
62 ctl |= HCB_DS_BIT;
63 break;
64 }
65 outb(ctl, cio_addr);
66}
67
68static unsigned char n411_get_ctl(struct hecubafb_par *par)
69{
70 return inb(c2io_addr);
71}
72
73static void n411_set_data(struct hecubafb_par *par, unsigned char value)
74{
75 outb(value, dio_addr);
76}
77
78static void n411_wait_for_ack(struct hecubafb_par *par, int clear)
79{
80 int timeout;
81 unsigned char tmp;
82
83 timeout = 500;
84 do {
85 tmp = n411_get_ctl(par);
86 if ((tmp & HCB_ACK_BIT) && (!clear))
87 return;
88 else if (!(tmp & HCB_ACK_BIT) && (clear))
89 return;
90 udelay(1);
91 } while (timeout--);
92 printk(KERN_ERR "timed out waiting for ack\n");
93}
94
95static int n411_init_control(struct hecubafb_par *par)
96{
97 unsigned char tmp;
98 /* for init, we want the following setup to be set:
99 WUP = lo
100 ACK = hi
101 DS = hi
102 RW = hi
103 CD = lo
104 */
105
106 /* write WUP to lo, DS to hi, RW to hi, CD to lo */
107 ctl = HCB_WUP_BIT | HCB_RW_BIT | HCB_CD_BIT ;
108 n411_set_ctl(par, HCB_DS_BIT, 1);
109
110 /* check ACK is not lo */
111 tmp = n411_get_ctl(par);
112 if (tmp & HCB_ACK_BIT) {
113 printk(KERN_ERR "Fail because ACK is already low\n");
114 return -ENXIO;
115 }
116
117 return 0;
118}
119
120
121static int n411_init_board(struct hecubafb_par *par)
122{
123 int retval;
124
125 retval = n411_init_control(par);
126 if (retval)
127 return retval;
128
129 par->send_command(par, APOLLO_INIT_DISPLAY);
130 par->send_data(par, 0x81);
131
132 /* have to wait while display resets */
133 udelay(1000);
134
135 /* if we were told to splash the screen, we just clear it */
136 if (!nosplash) {
137 par->send_command(par, APOLLO_ERASE_DISPLAY);
138 par->send_data(par, splashval);
139 }
140
141 return 0;
142}
143
144static struct hecuba_board n411_board = {
145 .owner = THIS_MODULE,
146 .init = n411_init_board,
147 .set_ctl = n411_set_ctl,
148 .set_data = n411_set_data,
149 .wait_for_ack = n411_wait_for_ack,
150};
151
152static struct platform_device *n411_device;
153static int __init n411_init(void)
154{
155 int ret;
156 if (!dio_addr || !cio_addr || !c2io_addr) {
157 printk(KERN_WARNING "no IO addresses supplied\n");
158 return -EINVAL;
159 }
160
161 /* request our platform independent driver */
162 request_module("hecubafb");
163
164 n411_device = platform_device_alloc("hecubafb", -1);
165 if (!n411_device)
166 return -ENOMEM;
167
168 platform_device_add_data(n411_device, &n411_board, sizeof(n411_board));
169
170 /* this _add binds hecubafb to n411. hecubafb refcounts n411 */
171 ret = platform_device_add(n411_device);
172
173 if (ret)
174 platform_device_put(n411_device);
175
176 return ret;
177
178}
179
180static void __exit n411_exit(void)
181{
182 platform_device_unregister(n411_device);
183}
184
185module_init(n411_init);
186module_exit(n411_exit);
187
188module_param(nosplash, uint, 0);
189MODULE_PARM_DESC(nosplash, "Disable doing the splash screen");
190module_param(dio_addr, ulong, 0);
191MODULE_PARM_DESC(dio_addr, "IO address for data, eg: 0x480");
192module_param(cio_addr, ulong, 0);
193MODULE_PARM_DESC(cio_addr, "IO address for control, eg: 0x400");
194module_param(c2io_addr, ulong, 0);
195MODULE_PARM_DESC(c2io_addr, "IO address for secondary control, eg: 0x408");
196module_param(splashval, ulong, 0);
197MODULE_PARM_DESC(splashval, "Splash pattern: 0x00 is black, 0x01 is white");
198
199MODULE_DESCRIPTION("board driver for n411 hecuba/apollo epd kit");
200MODULE_AUTHOR("Jaya Kumar");
201MODULE_LICENSE("GPL");
202