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