--- /dev/null
+/*
+ * linux/drivers/video/hecubafb.c -- FB driver for Hecuba/Apollo controller
+ *
+ * Copyright (C) 2006, Jaya Kumar
+ * This work was sponsored by CIS(M) Sdn Bhd
+ *
+ * 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 work was possible because of apollo display code from E-Ink's website
+ * http://support.eink.com/community
+ * All information used to write this code is from public material made
+ * available by E-Ink on its support site. Some commands such as 0xA4
+ * were found by looping through cmd=0x00 thru 0xFF and supplying random
+ * values. There are other commands that the display is capable of,
+ * beyond the 5 used here but they are more complex.
+ *
+ * This driver is written to be used with the Hecuba display architecture.
+ * The actual display chip is called Apollo and the interface electronics
+ * it needs is called Hecuba.
+ *
+ * It is intended to be architecture independent. A board specific driver
+ * must be used to perform all the physical IO interactions. An example
+ * is provided as n411.c
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/vmalloc.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 <video/hecubafb.h>
+
+/* Display specific information */
+#define DPY_W 600
+#define DPY_H 800
+
+static struct fb_fix_screeninfo hecubafb_fix = {
+ .id = "hecubafb",
+ .type = FB_TYPE_PACKED_PIXELS,
+ .visual = FB_VISUAL_MONO01,
+ .xpanstep = 0,
+ .ypanstep = 0,
+ .ywrapstep = 0,
+ .line_length = DPY_W,
+ .accel = FB_ACCEL_NONE,
+};
+
+static struct fb_var_screeninfo hecubafb_var = {
+ .xres = DPY_W,
+ .yres = DPY_H,
+ .xres_virtual = DPY_W,
+ .yres_virtual = DPY_H,
+ .bits_per_pixel = 1,
+ .nonstd = 1,
+};
+
+/* main hecubafb functions */
+
+static void apollo_send_data(struct hecubafb_par *par, unsigned char data)
+{
+ /* set data */
+ par->board->set_data(par, data);
+
+ /* set DS low */
+ par->board->set_ctl(par, HCB_DS_BIT, 0);
+
+ /* wait for ack */
+ par->board->wait_for_ack(par, 0);
+
+ /* set DS hi */
+ par->board->set_ctl(par, HCB_DS_BIT, 1);
+
+ /* wait for ack to clear */
+ par->board->wait_for_ack(par, 1);
+}
+
+static void apollo_send_command(struct hecubafb_par *par, unsigned char data)
+{
+ /* command so set CD to high */
+ par->board->set_ctl(par, HCB_CD_BIT, 1);
+
+ /* actually strobe with command */
+ apollo_send_data(par, data);
+
+ /* clear CD back to low */
+ par->board->set_ctl(par, HCB_CD_BIT, 0);
+}
+
+static void hecubafb_dpy_update(struct hecubafb_par *par)
+{
+ int i;
+ unsigned char *buf = (unsigned char __force *)par->info->screen_base;
+
+ apollo_send_command(par, APOLLO_START_NEW_IMG);
+
+ for (i=0; i < (DPY_W*DPY_H/8); i++) {
+ apollo_send_data(par, *(buf++));
+ }
+
+ apollo_send_command(par, APOLLO_STOP_IMG_DATA);
+ apollo_send_command(par, APOLLO_DISPLAY_IMG);
+}
+
+/* this is called back from the deferred io workqueue */
+static void hecubafb_dpy_deferred_io(struct fb_info *info,
+ struct list_head *pagelist)
+{
+ hecubafb_dpy_update(info->par);
+}
+
+static void hecubafb_fillrect(struct fb_info *info,
+ const struct fb_fillrect *rect)
+{
+ struct hecubafb_par *par = info->par;
+
+ sys_fillrect(info, rect);
+
+ hecubafb_dpy_update(par);
+}
+
+static void hecubafb_copyarea(struct fb_info *info,
+ const struct fb_copyarea *area)
+{
+ struct hecubafb_par *par = info->par;
+
+ sys_copyarea(info, area);
+
+ hecubafb_dpy_update(par);
+}
+
+static void hecubafb_imageblit(struct fb_info *info,
+ const struct fb_image *image)
+{
+ struct hecubafb_par *par = info->par;
+
+ sys_imageblit(info, image);
+
+ hecubafb_dpy_update(par);
+}
+
+/*
+ * this is the slow path from userspace. they can seek and write to
+ * the fb. it's inefficient to do anything less than a full screen draw
+ */
+static ssize_t hecubafb_write(struct fb_info *info, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct hecubafb_par *par = info->par;
+ unsigned long p = *ppos;
+ void *dst;
+ int err = 0;
+ unsigned long total_size;
+
+ if (info->state != FBINFO_STATE_RUNNING)
+ return -EPERM;
+
+ total_size = info->fix.smem_len;
+
+ if (p > total_size)
+ return -EFBIG;
+
+ if (count > total_size) {
+ err = -EFBIG;
+ count = total_size;
+ }
+
+ if (count + p > total_size) {
+ if (!err)
+ err = -ENOSPC;
+
+ count = total_size - p;
+ }
+
+ dst = (void __force *) (info->screen_base + p);
+
+ if (copy_from_user(dst, buf, count))
+ err = -EFAULT;
+
+ if (!err)
+ *ppos += count;
+
+ hecubafb_dpy_update(par);
+
+ return (err) ? err : count;
+}
+
+static struct fb_ops hecubafb_ops = {
+ .owner = THIS_MODULE,
+ .fb_read = fb_sys_read,
+ .fb_write = hecubafb_write,
+ .fb_fillrect = hecubafb_fillrect,
+ .fb_copyarea = hecubafb_copyarea,
+ .fb_imageblit = hecubafb_imageblit,
+};
+
+static struct fb_deferred_io hecubafb_defio = {
+ .delay = HZ,
+ .deferred_io = hecubafb_dpy_deferred_io,
+};
+
+static int hecubafb_probe(struct platform_device *dev)
+{
+ struct fb_info *info;
+ struct hecuba_board *board;
+ int retval = -ENOMEM;
+ int videomemorysize;
+ unsigned char *videomemory;
+ struct hecubafb_par *par;
+
+ /* pick up board specific routines */
+ board = dev->dev.platform_data;
+ if (!board)
+ return -EINVAL;
+
+ /* try to count device specific driver, if can't, platform recalls */
+ if (!try_module_get(board->owner))
+ return -ENODEV;
+
+ videomemorysize = (DPY_W*DPY_H)/8;
+
+ videomemory = vzalloc(videomemorysize);
+ if (!videomemory)
+ goto err_videomem_alloc;
+
+ info = framebuffer_alloc(sizeof(struct hecubafb_par), &dev->dev);
+ if (!info)
+ goto err_fballoc;
+
+ info->screen_base = (char __force __iomem *)videomemory;
+ info->fbops = &hecubafb_ops;
+
+ info->var = hecubafb_var;
+ info->fix = hecubafb_fix;
+ info->fix.smem_len = videomemorysize;
+ par = info->par;
+ par->info = info;
+ par->board = board;
+ par->send_command = apollo_send_command;
+ par->send_data = apollo_send_data;
+
+ info->flags = FBINFO_FLAG_DEFAULT | FBINFO_VIRTFB;
+
+ info->fbdefio = &hecubafb_defio;
+ fb_deferred_io_init(info);
+
+ retval = register_framebuffer(info);
+ if (retval < 0)
+ goto err_fbreg;
+ platform_set_drvdata(dev, info);
+
+ fb_info(info, "Hecuba frame buffer device, using %dK of video memory\n",
+ videomemorysize >> 10);
+
+ /* this inits the dpy */
+ retval = par->board->init(par);
+ if (retval < 0)
+ goto err_fbreg;
+
+ return 0;
+err_fbreg:
+ framebuffer_release(info);
+err_fballoc:
+ vfree(videomemory);
+err_videomem_alloc:
+ module_put(board->owner);
+ return retval;
+}
+
+static int hecubafb_remove(struct platform_device *dev)
+{
+ struct fb_info *info = platform_get_drvdata(dev);
+
+ if (info) {
+ struct hecubafb_par *par = info->par;
+ fb_deferred_io_cleanup(info);
+ unregister_framebuffer(info);
+ vfree((void __force *)info->screen_base);
+ if (par->board->remove)
+ par->board->remove(par);
+ module_put(par->board->owner);
+ framebuffer_release(info);
+ }
+ return 0;
+}
+
+static struct platform_driver hecubafb_driver = {
+ .probe = hecubafb_probe,
+ .remove = hecubafb_remove,
+ .driver = {
+ .name = "hecubafb",
+ },
+};
+module_platform_driver(hecubafb_driver);
+
+MODULE_DESCRIPTION("fbdev driver for Hecuba/Apollo controller");
+MODULE_AUTHOR("Jaya Kumar");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff