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![Jaya Kumar](/assets/img/avatar_default.png)
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>
202 lines
4.8 KiB
C
202 lines
4.8 KiB
C
/*
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* linux/drivers/video/n411.c -- Platform device for N411 EPD kit
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*
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* Copyright (C) 2008, Jaya Kumar
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive for
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* more details.
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*
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* Layout is based on skeletonfb.c by James Simmons and Geert Uytterhoeven.
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*
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* This driver is written to be used with the Hecuba display controller
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* board, and tested with the EInk 800x600 display in 1 bit mode.
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* The interface between Hecuba and the host is TTL based GPIO. The
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* GPIO requirements are 8 writable data lines and 6 lines for control.
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* Only 4 of the controls are actually used here but 6 for future use.
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* The driver requires the IO addresses for data and control GPIO at
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* load time. It is also possible to use this display with a standard
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* PC parallel port.
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*
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* General notes:
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* - User must set dio_addr=0xIOADDR cio_addr=0xIOADDR c2io_addr=0xIOADDR
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*
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/fb.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/list.h>
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#include <linux/uaccess.h>
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#include <linux/irq.h>
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#include <video/hecubafb.h>
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static unsigned long dio_addr;
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static unsigned long cio_addr;
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static unsigned long c2io_addr;
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static unsigned long splashval;
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static unsigned int nosplash;
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static unsigned char ctl;
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static void n411_set_ctl(struct hecubafb_par *par, unsigned char bit, unsigned
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char state)
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{
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switch (bit) {
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case HCB_CD_BIT:
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if (state)
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ctl &= ~(HCB_CD_BIT);
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else
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ctl |= HCB_CD_BIT;
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break;
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case HCB_DS_BIT:
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if (state)
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ctl &= ~(HCB_DS_BIT);
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else
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ctl |= HCB_DS_BIT;
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break;
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}
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outb(ctl, cio_addr);
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}
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static unsigned char n411_get_ctl(struct hecubafb_par *par)
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{
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return inb(c2io_addr);
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}
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static void n411_set_data(struct hecubafb_par *par, unsigned char value)
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{
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outb(value, dio_addr);
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}
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static void n411_wait_for_ack(struct hecubafb_par *par, int clear)
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{
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int timeout;
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unsigned char tmp;
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timeout = 500;
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do {
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tmp = n411_get_ctl(par);
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if ((tmp & HCB_ACK_BIT) && (!clear))
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return;
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else if (!(tmp & HCB_ACK_BIT) && (clear))
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return;
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udelay(1);
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} while (timeout--);
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printk(KERN_ERR "timed out waiting for ack\n");
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}
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static int n411_init_control(struct hecubafb_par *par)
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{
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unsigned char tmp;
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/* for init, we want the following setup to be set:
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WUP = lo
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ACK = hi
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DS = hi
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RW = hi
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CD = lo
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*/
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/* write WUP to lo, DS to hi, RW to hi, CD to lo */
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ctl = HCB_WUP_BIT | HCB_RW_BIT | HCB_CD_BIT ;
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n411_set_ctl(par, HCB_DS_BIT, 1);
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/* check ACK is not lo */
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tmp = n411_get_ctl(par);
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if (tmp & HCB_ACK_BIT) {
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printk(KERN_ERR "Fail because ACK is already low\n");
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return -ENXIO;
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}
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return 0;
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}
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static int n411_init_board(struct hecubafb_par *par)
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{
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int retval;
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retval = n411_init_control(par);
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if (retval)
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return retval;
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par->send_command(par, APOLLO_INIT_DISPLAY);
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par->send_data(par, 0x81);
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/* have to wait while display resets */
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udelay(1000);
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/* if we were told to splash the screen, we just clear it */
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if (!nosplash) {
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par->send_command(par, APOLLO_ERASE_DISPLAY);
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par->send_data(par, splashval);
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}
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return 0;
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}
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static struct hecuba_board n411_board = {
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.owner = THIS_MODULE,
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.init = n411_init_board,
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.set_ctl = n411_set_ctl,
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.set_data = n411_set_data,
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.wait_for_ack = n411_wait_for_ack,
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};
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static struct platform_device *n411_device;
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static int __init n411_init(void)
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{
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int ret;
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if (!dio_addr || !cio_addr || !c2io_addr) {
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printk(KERN_WARNING "no IO addresses supplied\n");
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return -EINVAL;
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}
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/* request our platform independent driver */
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request_module("hecubafb");
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n411_device = platform_device_alloc("hecubafb", -1);
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if (!n411_device)
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return -ENOMEM;
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platform_device_add_data(n411_device, &n411_board, sizeof(n411_board));
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/* this _add binds hecubafb to n411. hecubafb refcounts n411 */
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ret = platform_device_add(n411_device);
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if (ret)
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platform_device_put(n411_device);
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return ret;
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}
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static void __exit n411_exit(void)
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{
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platform_device_unregister(n411_device);
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}
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module_init(n411_init);
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module_exit(n411_exit);
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module_param(nosplash, uint, 0);
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MODULE_PARM_DESC(nosplash, "Disable doing the splash screen");
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module_param(dio_addr, ulong, 0);
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MODULE_PARM_DESC(dio_addr, "IO address for data, eg: 0x480");
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module_param(cio_addr, ulong, 0);
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MODULE_PARM_DESC(cio_addr, "IO address for control, eg: 0x400");
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module_param(c2io_addr, ulong, 0);
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MODULE_PARM_DESC(c2io_addr, "IO address for secondary control, eg: 0x408");
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module_param(splashval, ulong, 0);
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MODULE_PARM_DESC(splashval, "Splash pattern: 0x00 is black, 0x01 is white");
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MODULE_DESCRIPTION("board driver for n411 hecuba/apollo epd kit");
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MODULE_AUTHOR("Jaya Kumar");
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MODULE_LICENSE("GPL");
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