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744d35d343
Deferred-I/O generator macros generate callbacks for struct fb_ops that operate on memory ranges in I/O address space or system address space. Rename the macros to use the _IOMEM_ and _SYSMEM_ infixes of their underlying helpers. Adapt all users. No functional changes. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Sam Ravnborg <sam@ravnborg.org> Acked-by: Helge Deller <deller@gmx.de> Link: https://patchwork.freedesktop.org/patch/msgid/20230729193157.15446-5-tzimmermann@suse.de
248 lines
6.0 KiB
C
248 lines
6.0 KiB
C
/*
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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 = par->info->screen_buffer;
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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, struct list_head *pagereflist)
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{
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hecubafb_dpy_update(info->par);
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}
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static void hecubafb_defio_damage_range(struct fb_info *info, off_t off, size_t len)
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{
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struct hecubafb_par *par = info->par;
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hecubafb_dpy_update(par);
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}
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static void hecubafb_defio_damage_area(struct fb_info *info, u32 x, u32 y,
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u32 width, u32 height)
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{
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struct hecubafb_par *par = info->par;
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hecubafb_dpy_update(par);
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}
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FB_GEN_DEFAULT_DEFERRED_SYSMEM_OPS(hecubafb,
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hecubafb_defio_damage_range,
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hecubafb_defio_damage_area)
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static const struct fb_ops hecubafb_ops = {
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.owner = THIS_MODULE,
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FB_DEFAULT_DEFERRED_OPS(hecubafb),
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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_buffer = 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_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 void 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(info->screen_buffer);
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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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}
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static struct platform_driver hecubafb_driver = {
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.probe = hecubafb_probe,
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.remove_new = 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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