[Test_Module] Changing brightness in Toshiba notebooks with Phoenix Bios

["Renato S. Yamane" <renatoyamane@mandic.com.br>]

Forwarding from: Toshiba_Linux-Users (tlinux-users@linux.toshiba-dme.co.jp)

=============
I only tested on my Toshiba Satellite Pro A100 and it works.

To compile:
Edit a Makefile and add:
  obj-m := test.o

then run in the same directory:

 make -C /usr/src/linux SUBDIRS=`pwd` modules

Then make the file for the new device:

 mknod test_file c 181 0

Load de module:

 insmod test.ko

And now, if you are very very lucky, maybe it will work:

  echo 3 > test_file

But I warn: THE MOST PROBABLY THING WILL HAPPEN IS THE FREEZE OF THE
LAPTOP IF YOUR MODEL DOESN'T MATCH EXACTLY WITH THE MODEL I TESTED. If
you don't have a Phoenix BIOS don't try this, and if you have.. well..
it's your election x)

Here is the driver

test.c
=================== CUT HERE ===================
/*
* Module for Toshiba lcd bright change.
* I only made it for my Toshiba Satellite Pro A100 with Phoenix BIOS
* I don't know under which models it works (I suppose very few)
* The asm code I inserted I took it from a disass of the windows
* driver provided by Toshiba.
* WARNING:
* The driver does NOT make any tests if the model is valid or not
* so, the MOST probably effect of running this will be the hang of
* the laptop, or something worse.
* PLEASE DON'T USE THIS unless you really know what you are doing
* This module isn't made for give support to any Toshiba model,
* only for tests purpouses , sorry about it.
*
* Jaime F. <jaimeff@gmail.com>
* License: GNU/GPL
*/


#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/io.h>

#define DEVICE_NAME "lcd_bright"
#define MAJOR_NUM 181

char *ptr;

static ssize_t
device_write(struct file *file,
            const char __user * buffer, size_t length, loff_t * offset)
{
 char *addr;
 addr=(char *)__pa(ptr);
 addr+=0x10;

 strcpy(ptr, "INVTOS");
 //ptr+=10;
 *(ptr+16)=(char) buffer[0]-0x30;
 //printk("escribiendo %x\n", *ptr);
/*
 inb( 0x2e);
 inb( 0x2f);
 outb(7, 0x2e);
 outb(9, 0x2f);
 v3=inb(0x2f);
 outb2(0x2e, 0x55);
 outb2(0x2e, 7);
 outb2(0x2f,0x10);
 outb2(0x2e,0xe0);
 v4=inb(0x2f);
 outb2(0x2f,2);
 v5=inb(0x2f);
 outb2(0x2f,3);

 outb2(0x2e, 7);
 outb2(0x2f,9);
 outb2(0x2e,0x60);
 v1=inb(0x2f);
 outb2(0x2e,7);
 outb2(0x2f,0x10);
 outb2(0x2e,0xe0);
 outb2(0x2f,0);
 outb2(0x2e, 7);
 outb2(0x2f, 9);
 outb2 ( 0x2e, 0xaa);
 outb2 ( 0x400, 0xAF);
 v2=inb( 0x401);
 outb2( 0x400, 0xAF);
*/

 __asm__("cli\n"
       /*        "mov $0x01E4, %%eax\n"
                 "mov $0x00b0, %%dx\n"
                 "movb $0x02, 0xEF\n"
                 "out %%eax, %%dx\n"
*/
               "mov %0, %%edx\n"
               "mov %%edx, %%edi\n"
               "mov $0x20, %%ecx\n"
               "mov $0x8000f840, %%eax\n mov $0xcf8, %%edx\n out %%eax, 
%%dx\n"
               "mov $0xcfc, %%dx\n"
               "in %%dx, %%eax\n"
               "and $0x0000ff80, %%eax\n"
               "add $0x2c, %%eax\n"
               "mov %%ax, %%dx\n"
               "in %%dx, %%eax\n"
               "push %%eax\n"
//              "mov %%ax, %%dx\n"
               "xor %%eax, %%eax\n"
               "out %%eax, %%dx\n"
               "mov $0xA2E4, %%eax\n"
               "mov $0xb2, %%dx\n"
               "out %%eax, %%dx\n"
               "pop %%eax\n"
               "mov $0x102c, %%dx\n"
               "out %%eax, %%dx\n"
/*              "movl $0x10, %%edx\n\t"
               "movl %%edx, %%edi\n\t"
               "movl $0x20, %%ecx\n"
               "movw  $0x00E4, %%ax\n"
               "movb  $0x5, %%ah\n"
               "outw  %%ax, $0xb2\n"
               "movl %%eax, %0\n sti\n"
               */
       :
       :"r"(addr): "%eax", "%edx", "%ecx","%edi", "%esi");
 return length;
}

struct file_operations Fops = {
 .write = device_write,
};

int init_module()
{
 int ret_val;
 ptr=(char *)kmalloc(100, GFP_KERNEL);
 ptr+=10;
 ret_val = register_chrdev(MAJOR_NUM, DEVICE_NAME, &Fops);

 if (ret_val < 0)
 {
   printk(KERN_ALERT "El registro del dispositivo falló (%d)\n", ret_val);
   return ret_val;
 }

return 0;
}

void cleanup_module()
{
 int ret;

 ret = unregister_chrdev(MAJOR_NUM, DEVICE_NAME);

 if (ret < 0)
   printk(KERN_ALERT "Error: unregister_chrdev: %d\n", ret);
}

===================== CUT HERE ====================

Best Regards,
Renato S. Yamane
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