drivers/media/pci/mgb4/mgb4_regs.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2021-2022 Digiteq Automotive
   4  *     author: Martin Tuma <martin.tuma@digiteqautomotive.com>
   5  */
   6
   7 #include <linux/ioport.h>
   8 #include "mgb4_regs.h"
   9
  10 int mgb4_regs_map(struct resource *res, struct mgb4_regs *regs)
  11 {
  12         regs->mapbase = res->start;
  13         regs->mapsize = resource_size(res);
  14
  15         if (!request_mem_region(regs->mapbase, regs->mapsize, res->name))
  16                 return -EINVAL;
  17         regs->membase = ioremap(regs->mapbase, regs->mapsize);
  18         if (!regs->membase) {
  19                 release_mem_region(regs->mapbase, regs->mapsize);
  20                 return -EINVAL;
  21         }
  22
  23         return 0;
  24 }
  25
  26 void mgb4_regs_free(struct mgb4_regs *regs)
  27 {
  28         iounmap(regs->membase);
  29         release_mem_region(regs->mapbase, regs->mapsize);
  30 }