![Jani Nikula](/assets/img/avatar_default.png)
Now that the fbops member of struct fb_info is const, we can start making the ops const as well. This does not cover all drivers; some actually modify the fbops struct, for example to adjust for different configurations, and others do more involved things that I'd rather not touch in practically obsolete drivers. Mostly this is the low hanging fruit where we can add "const" and be done with it. v3: - un-constify atyfb, mb862xx, nvidia and uvesabf (0day) v2: - fix typo (Christophe de Dinechin) - use "static const" instead of "const static" in mx3fb.c - also constify smscufx.c Cc: linux-fbdev@vger.kernel.org Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/ce67f14435f3af498f2e8bf35ce4be11f7504132.1575390740.git.jani.nikula@intel.com
311 lines
7.2 KiB
C
311 lines
7.2 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 = (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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