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