drivers/video/fbdev/via/via_aux_sii164.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright 2011 Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
   4  */
   5 /*
   6  * driver for Silicon Image SiI 164 PanelLink Transmitter
   7  */
   8
   9 #include <linux/slab.h>
  10 #include "via_aux.h"
  11
  12
  13 static const char *name = "SiI 164 PanelLink Transmitter";
  14
  15
  16 static void probe(struct via_aux_bus *bus, u8 addr)
  17 {
  18         struct via_aux_drv drv = {
  19                 .bus    =       bus,
  20                 .addr   =       addr,
  21                 .name   =       name};
  22         /* check vendor id and device id */
  23         const u8 id[] = {0x01, 0x00, 0x06, 0x00}, len = ARRAY_SIZE(id);
  24         u8 tmp[ARRAY_SIZE(id)];
  25
  26         if (!via_aux_read(&drv, 0x00, tmp, len) || memcmp(id, tmp, len))
  27                 return;
  28
  29         printk(KERN_INFO "viafb: Found %s at address 0x%x\n", name, addr);
  30         via_aux_add(&drv);
  31 }
  32
  33 void via_aux_sii164_probe(struct via_aux_bus *bus)
  34 {
  35         u8 i;
  36
  37         for (i = 0x38; i <= 0x3F; i++)
  38                 probe(bus, i);
  39 }