Commit ce0f1f11 authored by John Belmonte's avatar John Belmonte Committed by Len Brown

[PATCH] toshiba_acpi 0.17 from John Belmonte

Fix remote chance of invalid buffer access in write_video.
Support alternate HCI method path (recent "Phoenix BIOS" Toshiba's).
Signal more proc-write errors.
On proc-reads, report errors via printk instead of proc output.
Add log level and driver name prefix to all printk's.
Add missing __init and __exit function attributes.
Be explicit about vars for which code relies on zero-init of BSS.
parent 39aa655b
......@@ -2,7 +2,7 @@
* toshiba_acpi.c - Toshiba Laptop ACPI Extras
*
*
* Copyright (C) 2002-2003 John Belmonte
* Copyright (C) 2002-2004 John Belmonte
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
......@@ -33,7 +33,7 @@
*
*/
#define TOSHIBA_ACPI_VERSION "0.16"
#define TOSHIBA_ACPI_VERSION "0.17"
#define PROC_INTERFACE_VERSION 1
#include <linux/kernel.h>
......@@ -48,9 +48,15 @@ MODULE_AUTHOR("John Belmonte");
MODULE_DESCRIPTION("Toshiba Laptop ACPI Extras Driver");
MODULE_LICENSE("GPL");
#define MY_LOGPREFIX "toshiba_acpi: "
#define MY_ERR KERN_ERR MY_LOGPREFIX
#define MY_NOTICE KERN_NOTICE MY_LOGPREFIX
#define MY_INFO KERN_INFO MY_LOGPREFIX
/* Toshiba ACPI method paths */
#define METHOD_LCD_BRIGHTNESS "\\_SB_.PCI0.VGA_.LCD_._BCM"
#define METHOD_HCI "\\_SB_.VALD.GHCI"
#define METHOD_HCI_1 "\\_SB_.VALD.GHCI"
#define METHOD_HCI_2 "\\_SB_.VALZ.GHCI"
#define METHOD_VIDEO_OUT "\\_SB_.VALX.DSSX"
/* Toshiba HCI interface definitions
......@@ -120,6 +126,16 @@ snscanf(const char* str, int n, const char* format, ...)
/* acpi interface wrappers
*/
static int
is_valid_acpi_path(const char* methodName)
{
acpi_handle handle;
acpi_status status;
status = acpi_get_handle(0, (char*)methodName, &handle);
return !ACPI_FAILURE(status);
}
static int
write_acpi_int(const char* methodName, int val)
{
......@@ -154,6 +170,8 @@ read_acpi_int(const char* methodName, int* pVal)
}
#endif
static const char* method_hci /*= 0*/;
/* Perform a raw HCI call. Here we don't care about input or output buffer
* format.
*/
......@@ -177,7 +195,7 @@ hci_raw(const u32 in[HCI_WORDS], u32 out[HCI_WORDS])
results.length = sizeof(out_objs);
results.pointer = out_objs;
status = acpi_evaluate_object(0, METHOD_HCI, &params,
status = acpi_evaluate_object(0, (char*)method_hci, &params,
&results);
if ((status == AE_OK) && (out_objs->package.count <= HCI_WORDS)) {
for (i = 0; i < out_objs->package.count; ++i) {
......@@ -215,7 +233,7 @@ hci_read1(u32 reg, u32* out1, u32* result)
return status;
}
static struct proc_dir_entry* toshiba_proc_dir;
static struct proc_dir_entry* toshiba_proc_dir /*= 0*/;
static int force_fan;
static int last_key_event;
static int key_event_valid;
......@@ -270,7 +288,7 @@ read_lcd(char* p)
p += sprintf(p, "brightness_levels: %d\n",
HCI_LCD_BRIGHTNESS_LEVELS);
} else {
p += sprintf(p, "ERROR\n");
printk(MY_ERR "Error reading LCD brightness\n");
}
return p;
......@@ -310,7 +328,7 @@ read_video(char* p)
p += sprintf(p, "crt_out: %d\n", is_crt);
p += sprintf(p, "tv_out: %d\n", is_tv);
} else {
p += sprintf(p, "ERROR\n");
printk(MY_ERR "Error reading video out status\n");
}
return p;
......@@ -320,25 +338,31 @@ static unsigned long
write_video(const char* buffer, unsigned long count)
{
int value;
const char* buffer_end = buffer + count;
int remain = count;
int lcd_out = -1;
int crt_out = -1;
int tv_out = -1;
u32 hci_result;
int video_out;
/* scan expression. Multiple expressions may be delimited with ; */
do {
if (snscanf(buffer, count, " lcd_out : %i", &value) == 1)
/* scan expression. Multiple expressions may be delimited with ;
*
* NOTE: to keep scanning simple, invalid fields are ignored
*/
while (remain) {
if (snscanf(buffer, remain, " lcd_out : %i", &value) == 1)
lcd_out = value & 1;
else if (snscanf(buffer, count, " crt_out : %i", &value) == 1)
else if (snscanf(buffer, remain, " crt_out : %i", &value) == 1)
crt_out = value & 1;
else if (snscanf(buffer, count, " tv_out : %i", &value) == 1)
else if (snscanf(buffer, remain, " tv_out : %i", &value) == 1)
tv_out = value & 1;
/* advance to one character past the next ; */
do ++buffer;
while ((buffer < buffer_end) && (*(buffer-1) != ';'));
} while (buffer < buffer_end);
do {
++buffer;
--remain;
}
while (remain && *(buffer-1) != ';');
}
hci_read1(HCI_VIDEO_OUT, &video_out, &hci_result);
if (hci_result == HCI_SUCCESS) {
......@@ -353,6 +377,8 @@ write_video(const char* buffer, unsigned long count)
* video setting if something changed. */
if (new_video_out != video_out)
write_acpi_int(METHOD_VIDEO_OUT, new_video_out);
} else {
return -EFAULT;
}
return count;
......@@ -369,7 +395,7 @@ read_fan(char* p)
p += sprintf(p, "running: %d\n", (value > 0));
p += sprintf(p, "force_on: %d\n", force_fan);
} else {
p += sprintf(p, "ERROR\n");
printk(MY_ERR "Error reading fan status\n");
}
return p;
......@@ -413,8 +439,9 @@ read_keys(char* p)
* some machines where system events sporadically
* become disabled. */
hci_write1(HCI_SYSTEM_EVENT, 1, &hci_result);
printk(MY_NOTICE "Re-enabled hotkeys\n");
} else {
p += sprintf(p, "ERROR\n");
printk(MY_ERR "Error reading hotkey status\n");
goto end;
}
}
......@@ -465,7 +492,7 @@ ProcItem proc_items[] =
{ 0 , 0 , 0 },
};
static acpi_status
static acpi_status __init
add_device(void)
{
struct proc_dir_entry* proc;
......@@ -483,7 +510,7 @@ add_device(void)
return(AE_OK);
}
static acpi_status
static acpi_status __exit
remove_device(void)
{
ProcItem* item;
......@@ -497,15 +524,19 @@ static int __init
toshiba_acpi_init(void)
{
acpi_status status = AE_OK;
int value;
u32 hci_result;
/* simple device detection: try reading an HCI register */
hci_read1(HCI_LCD_BRIGHTNESS, &value, &hci_result);
if (hci_result != HCI_SUCCESS)
/* simple device detection: look for HCI method */
if (is_valid_acpi_path(METHOD_HCI_1))
method_hci = METHOD_HCI_1;
else if (is_valid_acpi_path(METHOD_HCI_2))
method_hci = METHOD_HCI_2;
else
return -ENODEV;
printk("Toshiba Laptop ACPI Extras version %s\n", TOSHIBA_ACPI_VERSION);
printk(MY_INFO "Toshiba Laptop ACPI Extras version %s\n",
TOSHIBA_ACPI_VERSION);
printk(MY_INFO " HCI method: %s\n", method_hci);
force_fan = 0;
key_event_valid = 0;
......
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