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208 lines
4.9 KiB
208 lines
4.9 KiB
/* |
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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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ret = platform_device_add_data(n411_device, &n411_board, |
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sizeof(n411_board)); |
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if (ret) |
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goto put_plat_device; |
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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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goto put_plat_device; |
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return 0; |
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put_plat_device: |
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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_hw(dio_addr, ulong, ioport, 0); |
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MODULE_PARM_DESC(dio_addr, "IO address for data, eg: 0x480"); |
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module_param_hw(cio_addr, ulong, ioport, 0); |
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MODULE_PARM_DESC(cio_addr, "IO address for control, eg: 0x400"); |
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module_param_hw(c2io_addr, ulong, ioport, 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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