2 * linux/drivers/video/n411.c -- Platform device for N411 EPD kit
4 * Copyright (C) 2008, Jaya Kumar
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
10 * Layout is based on skeletonfb.c by James Simmons and Geert Uytterhoeven.
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
22 * - User must set dio_addr=0xIOADDR cio_addr=0xIOADDR c2io_addr=0xIOADDR
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>
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>
39 #include <video/hecubafb.h>
41 static unsigned long dio_addr
;
42 static unsigned long cio_addr
;
43 static unsigned long c2io_addr
;
44 static unsigned long splashval
;
45 static unsigned int nosplash
;
46 static unsigned char ctl
;
48 static void n411_set_ctl(struct hecubafb_par
*par
, unsigned char bit
, unsigned
68 static unsigned char n411_get_ctl(struct hecubafb_par
*par
)
70 return inb(c2io_addr
);
73 static void n411_set_data(struct hecubafb_par
*par
, unsigned char value
)
75 outb(value
, dio_addr
);
78 static void n411_wait_for_ack(struct hecubafb_par
*par
, int clear
)
85 tmp
= n411_get_ctl(par
);
86 if ((tmp
& HCB_ACK_BIT
) && (!clear
))
88 else if (!(tmp
& HCB_ACK_BIT
) && (clear
))
92 printk(KERN_ERR
"timed out waiting for ack\n");
95 static int n411_init_control(struct hecubafb_par
*par
)
98 /* for init, we want the following setup to be set:
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);
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");
121 static int n411_init_board(struct hecubafb_par
*par
)
125 retval
= n411_init_control(par
);
129 par
->send_command(par
, APOLLO_INIT_DISPLAY
);
130 par
->send_data(par
, 0x81);
132 /* have to wait while display resets */
135 /* if we were told to splash the screen, we just clear it */
137 par
->send_command(par
, APOLLO_ERASE_DISPLAY
);
138 par
->send_data(par
, splashval
);
144 static 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
,
152 static struct platform_device
*n411_device
;
153 static int __init
n411_init(void)
156 if (!dio_addr
|| !cio_addr
|| !c2io_addr
) {
157 printk(KERN_WARNING
"no IO addresses supplied\n");
161 /* request our platform independent driver */
162 request_module("hecubafb");
164 n411_device
= platform_device_alloc("hecubafb", -1);
168 platform_device_add_data(n411_device
, &n411_board
, sizeof(n411_board
));
170 /* this _add binds hecubafb to n411. hecubafb refcounts n411 */
171 ret
= platform_device_add(n411_device
);
174 platform_device_put(n411_device
);
180 static void __exit
n411_exit(void)
182 platform_device_unregister(n411_device
);
185 module_init(n411_init
);
186 module_exit(n411_exit
);
188 module_param(nosplash
, uint
, 0);
189 MODULE_PARM_DESC(nosplash
, "Disable doing the splash screen");
190 module_param(dio_addr
, ulong
, 0);
191 MODULE_PARM_DESC(dio_addr
, "IO address for data, eg: 0x480");
192 module_param(cio_addr
, ulong
, 0);
193 MODULE_PARM_DESC(cio_addr
, "IO address for control, eg: 0x400");
194 module_param(c2io_addr
, ulong
, 0);
195 MODULE_PARM_DESC(c2io_addr
, "IO address for secondary control, eg: 0x408");
196 module_param(splashval
, ulong
, 0);
197 MODULE_PARM_DESC(splashval
, "Splash pattern: 0x00 is black, 0x01 is white");
199 MODULE_DESCRIPTION("board driver for n411 hecuba/apollo epd kit");
200 MODULE_AUTHOR("Jaya Kumar");
201 MODULE_LICENSE("GPL");
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