Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
This commit is contained in:
Linus Torvalds
575
drivers/acpi/toshiba_acpi.c
Normal file
575
drivers/acpi/toshiba_acpi.c
Normal file
@@ -0,0 +1,575 @@
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/*
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* toshiba_acpi.c - Toshiba Laptop ACPI Extras
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*
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*
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* Copyright (C) 2002-2004 John Belmonte
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*
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* The devolpment page for this driver is located at
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* http://memebeam.org/toys/ToshibaAcpiDriver.
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*
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* Credits:
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* Jonathan A. Buzzard - Toshiba HCI info, and critical tips on reverse
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* engineering the Windows drivers
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* Yasushi Nagato - changes for linux kernel 2.4 -> 2.5
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* Rob Miller - TV out and hotkeys help
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*
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*
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* TODO
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*
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*/
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#define TOSHIBA_ACPI_VERSION "0.18"
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#define PROC_INTERFACE_VERSION 1
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/proc_fs.h>
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#include <asm/uaccess.h>
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#include <acpi/acpi_drivers.h>
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MODULE_AUTHOR("John Belmonte");
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MODULE_DESCRIPTION("Toshiba Laptop ACPI Extras Driver");
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MODULE_LICENSE("GPL");
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#define MY_LOGPREFIX "toshiba_acpi: "
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#define MY_ERR KERN_ERR MY_LOGPREFIX
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#define MY_NOTICE KERN_NOTICE MY_LOGPREFIX
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#define MY_INFO KERN_INFO MY_LOGPREFIX
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/* Toshiba ACPI method paths */
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#define METHOD_LCD_BRIGHTNESS "\\_SB_.PCI0.VGA_.LCD_._BCM"
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#define METHOD_HCI_1 "\\_SB_.VALD.GHCI"
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#define METHOD_HCI_2 "\\_SB_.VALZ.GHCI"
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#define METHOD_VIDEO_OUT "\\_SB_.VALX.DSSX"
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/* Toshiba HCI interface definitions
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*
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* HCI is Toshiba's "Hardware Control Interface" which is supposed to
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* be uniform across all their models. Ideally we would just call
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* dedicated ACPI methods instead of using this primitive interface.
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* However the ACPI methods seem to be incomplete in some areas (for
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* example they allow setting, but not reading, the LCD brightness value),
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* so this is still useful.
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*/
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#define HCI_WORDS 6
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/* operations */
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#define HCI_SET 0xff00
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#define HCI_GET 0xfe00
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/* return codes */
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#define HCI_SUCCESS 0x0000
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#define HCI_FAILURE 0x1000
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#define HCI_NOT_SUPPORTED 0x8000
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#define HCI_EMPTY 0x8c00
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/* registers */
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#define HCI_FAN 0x0004
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#define HCI_SYSTEM_EVENT 0x0016
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#define HCI_VIDEO_OUT 0x001c
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#define HCI_HOTKEY_EVENT 0x001e
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#define HCI_LCD_BRIGHTNESS 0x002a
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/* field definitions */
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#define HCI_LCD_BRIGHTNESS_BITS 3
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#define HCI_LCD_BRIGHTNESS_SHIFT (16-HCI_LCD_BRIGHTNESS_BITS)
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#define HCI_LCD_BRIGHTNESS_LEVELS (1 << HCI_LCD_BRIGHTNESS_BITS)
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#define HCI_VIDEO_OUT_LCD 0x1
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#define HCI_VIDEO_OUT_CRT 0x2
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#define HCI_VIDEO_OUT_TV 0x4
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/* utility
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*/
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static __inline__ void
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_set_bit(u32* word, u32 mask, int value)
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{
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*word = (*word & ~mask) | (mask * value);
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}
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/* acpi interface wrappers
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*/
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static int
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is_valid_acpi_path(const char* methodName)
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{
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acpi_handle handle;
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acpi_status status;
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status = acpi_get_handle(NULL, (char*)methodName, &handle);
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return !ACPI_FAILURE(status);
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}
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static int
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write_acpi_int(const char* methodName, int val)
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{
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struct acpi_object_list params;
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union acpi_object in_objs[1];
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acpi_status status;
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params.count = sizeof(in_objs)/sizeof(in_objs[0]);
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params.pointer = in_objs;
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in_objs[0].type = ACPI_TYPE_INTEGER;
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in_objs[0].integer.value = val;
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status = acpi_evaluate_object(NULL, (char*)methodName, ¶ms, NULL);
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return (status == AE_OK);
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}
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#if 0
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static int
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read_acpi_int(const char* methodName, int* pVal)
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{
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struct acpi_buffer results;
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union acpi_object out_objs[1];
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acpi_status status;
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results.length = sizeof(out_objs);
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results.pointer = out_objs;
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status = acpi_evaluate_object(0, (char*)methodName, 0, &results);
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*pVal = out_objs[0].integer.value;
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return (status == AE_OK) && (out_objs[0].type == ACPI_TYPE_INTEGER);
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}
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#endif
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static const char* method_hci /*= 0*/;
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/* Perform a raw HCI call. Here we don't care about input or output buffer
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* format.
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*/
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static acpi_status
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hci_raw(const u32 in[HCI_WORDS], u32 out[HCI_WORDS])
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{
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struct acpi_object_list params;
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union acpi_object in_objs[HCI_WORDS];
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struct acpi_buffer results;
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union acpi_object out_objs[HCI_WORDS+1];
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acpi_status status;
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int i;
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params.count = HCI_WORDS;
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params.pointer = in_objs;
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for (i = 0; i < HCI_WORDS; ++i) {
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in_objs[i].type = ACPI_TYPE_INTEGER;
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in_objs[i].integer.value = in[i];
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}
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results.length = sizeof(out_objs);
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results.pointer = out_objs;
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status = acpi_evaluate_object(NULL, (char*)method_hci, ¶ms,
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&results);
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if ((status == AE_OK) && (out_objs->package.count <= HCI_WORDS)) {
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for (i = 0; i < out_objs->package.count; ++i) {
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out[i] = out_objs->package.elements[i].integer.value;
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}
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}
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return status;
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}
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/* common hci tasks (get or set one value)
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*
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* In addition to the ACPI status, the HCI system returns a result which
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* may be useful (such as "not supported").
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*/
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static acpi_status
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hci_write1(u32 reg, u32 in1, u32* result)
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{
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u32 in[HCI_WORDS] = { HCI_SET, reg, in1, 0, 0, 0 };
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u32 out[HCI_WORDS];
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acpi_status status = hci_raw(in, out);
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*result = (status == AE_OK) ? out[0] : HCI_FAILURE;
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return status;
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}
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static acpi_status
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hci_read1(u32 reg, u32* out1, u32* result)
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{
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u32 in[HCI_WORDS] = { HCI_GET, reg, 0, 0, 0, 0 };
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u32 out[HCI_WORDS];
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acpi_status status = hci_raw(in, out);
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*out1 = out[2];
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*result = (status == AE_OK) ? out[0] : HCI_FAILURE;
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return status;
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}
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static struct proc_dir_entry* toshiba_proc_dir /*= 0*/;
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static int force_fan;
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static int last_key_event;
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static int key_event_valid;
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typedef struct _ProcItem
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{
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const char* name;
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char* (*read_func)(char*);
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unsigned long (*write_func)(const char*, unsigned long);
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} ProcItem;
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/* proc file handlers
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*/
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static int
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dispatch_read(char* page, char** start, off_t off, int count, int* eof,
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ProcItem* item)
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{
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char* p = page;
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int len;
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if (off == 0)
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p = item->read_func(p);
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/* ISSUE: I don't understand this code */
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len = (p - page);
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if (len <= off+count) *eof = 1;
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*start = page + off;
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len -= off;
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if (len>count) len = count;
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if (len<0) len = 0;
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return len;
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}
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static int
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dispatch_write(struct file* file, const char __user * buffer,
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unsigned long count, ProcItem* item)
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{
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int result;
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char* tmp_buffer;
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/* Arg buffer points to userspace memory, which can't be accessed
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* directly. Since we're making a copy, zero-terminate the
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* destination so that sscanf can be used on it safely.
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*/
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tmp_buffer = kmalloc(count + 1, GFP_KERNEL);
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if (copy_from_user(tmp_buffer, buffer, count)) {
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result = -EFAULT;
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}
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else {
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tmp_buffer[count] = 0;
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result = item->write_func(tmp_buffer, count);
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}
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kfree(tmp_buffer);
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return result;
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}
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static char*
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read_lcd(char* p)
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{
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u32 hci_result;
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u32 value;
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hci_read1(HCI_LCD_BRIGHTNESS, &value, &hci_result);
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if (hci_result == HCI_SUCCESS) {
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value = value >> HCI_LCD_BRIGHTNESS_SHIFT;
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p += sprintf(p, "brightness: %d\n", value);
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p += sprintf(p, "brightness_levels: %d\n",
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HCI_LCD_BRIGHTNESS_LEVELS);
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} else {
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printk(MY_ERR "Error reading LCD brightness\n");
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}
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return p;
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}
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static unsigned long
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write_lcd(const char* buffer, unsigned long count)
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{
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int value;
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u32 hci_result;
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if (sscanf(buffer, " brightness : %i", &value) == 1 &&
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value >= 0 && value < HCI_LCD_BRIGHTNESS_LEVELS) {
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value = value << HCI_LCD_BRIGHTNESS_SHIFT;
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hci_write1(HCI_LCD_BRIGHTNESS, value, &hci_result);
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if (hci_result != HCI_SUCCESS)
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return -EFAULT;
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} else {
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return -EINVAL;
|
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}
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return count;
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}
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static char*
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read_video(char* p)
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{
|
||||
u32 hci_result;
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u32 value;
|
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|
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hci_read1(HCI_VIDEO_OUT, &value, &hci_result);
|
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if (hci_result == HCI_SUCCESS) {
|
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int is_lcd = (value & HCI_VIDEO_OUT_LCD) ? 1 : 0;
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int is_crt = (value & HCI_VIDEO_OUT_CRT) ? 1 : 0;
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||||
int is_tv = (value & HCI_VIDEO_OUT_TV ) ? 1 : 0;
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p += sprintf(p, "lcd_out: %d\n", is_lcd);
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||||
p += sprintf(p, "crt_out: %d\n", is_crt);
|
||||
p += sprintf(p, "tv_out: %d\n", is_tv);
|
||||
} else {
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printk(MY_ERR "Error reading video out status\n");
|
||||
}
|
||||
|
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return p;
|
||||
}
|
||||
|
||||
static unsigned long
|
||||
write_video(const char* buffer, unsigned long count)
|
||||
{
|
||||
int value;
|
||||
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 ;
|
||||
*
|
||||
* NOTE: to keep scanning simple, invalid fields are ignored
|
||||
*/
|
||||
while (remain) {
|
||||
if (sscanf(buffer, " lcd_out : %i", &value) == 1)
|
||||
lcd_out = value & 1;
|
||||
else if (sscanf(buffer, " crt_out : %i", &value) == 1)
|
||||
crt_out = value & 1;
|
||||
else if (sscanf(buffer, " tv_out : %i", &value) == 1)
|
||||
tv_out = value & 1;
|
||||
/* advance to one character past the next ; */
|
||||
do {
|
||||
++buffer;
|
||||
--remain;
|
||||
}
|
||||
while (remain && *(buffer-1) != ';');
|
||||
}
|
||||
|
||||
hci_read1(HCI_VIDEO_OUT, &video_out, &hci_result);
|
||||
if (hci_result == HCI_SUCCESS) {
|
||||
int new_video_out = video_out;
|
||||
if (lcd_out != -1)
|
||||
_set_bit(&new_video_out, HCI_VIDEO_OUT_LCD, lcd_out);
|
||||
if (crt_out != -1)
|
||||
_set_bit(&new_video_out, HCI_VIDEO_OUT_CRT, crt_out);
|
||||
if (tv_out != -1)
|
||||
_set_bit(&new_video_out, HCI_VIDEO_OUT_TV, tv_out);
|
||||
/* To avoid unnecessary video disruption, only write the new
|
||||
* 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;
|
||||
}
|
||||
|
||||
static char*
|
||||
read_fan(char* p)
|
||||
{
|
||||
u32 hci_result;
|
||||
u32 value;
|
||||
|
||||
hci_read1(HCI_FAN, &value, &hci_result);
|
||||
if (hci_result == HCI_SUCCESS) {
|
||||
p += sprintf(p, "running: %d\n", (value > 0));
|
||||
p += sprintf(p, "force_on: %d\n", force_fan);
|
||||
} else {
|
||||
printk(MY_ERR "Error reading fan status\n");
|
||||
}
|
||||
|
||||
return p;
|
||||
}
|
||||
|
||||
static unsigned long
|
||||
write_fan(const char* buffer, unsigned long count)
|
||||
{
|
||||
int value;
|
||||
u32 hci_result;
|
||||
|
||||
if (sscanf(buffer, " force_on : %i", &value) == 1 &&
|
||||
value >= 0 && value <= 1) {
|
||||
hci_write1(HCI_FAN, value, &hci_result);
|
||||
if (hci_result != HCI_SUCCESS)
|
||||
return -EFAULT;
|
||||
else
|
||||
force_fan = value;
|
||||
} else {
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
return count;
|
||||
}
|
||||
|
||||
static char*
|
||||
read_keys(char* p)
|
||||
{
|
||||
u32 hci_result;
|
||||
u32 value;
|
||||
|
||||
if (!key_event_valid) {
|
||||
hci_read1(HCI_SYSTEM_EVENT, &value, &hci_result);
|
||||
if (hci_result == HCI_SUCCESS) {
|
||||
key_event_valid = 1;
|
||||
last_key_event = value;
|
||||
} else if (hci_result == HCI_EMPTY) {
|
||||
/* better luck next time */
|
||||
} else if (hci_result == HCI_NOT_SUPPORTED) {
|
||||
/* This is a workaround for an unresolved issue on
|
||||
* some machines where system events sporadically
|
||||
* become disabled. */
|
||||
hci_write1(HCI_SYSTEM_EVENT, 1, &hci_result);
|
||||
printk(MY_NOTICE "Re-enabled hotkeys\n");
|
||||
} else {
|
||||
printk(MY_ERR "Error reading hotkey status\n");
|
||||
goto end;
|
||||
}
|
||||
}
|
||||
|
||||
p += sprintf(p, "hotkey_ready: %d\n", key_event_valid);
|
||||
p += sprintf(p, "hotkey: 0x%04x\n", last_key_event);
|
||||
|
||||
end:
|
||||
return p;
|
||||
}
|
||||
|
||||
static unsigned long
|
||||
write_keys(const char* buffer, unsigned long count)
|
||||
{
|
||||
int value;
|
||||
|
||||
if (sscanf(buffer, " hotkey_ready : %i", &value) == 1 &&
|
||||
value == 0) {
|
||||
key_event_valid = 0;
|
||||
} else {
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
return count;
|
||||
}
|
||||
|
||||
static char*
|
||||
read_version(char* p)
|
||||
{
|
||||
p += sprintf(p, "driver: %s\n", TOSHIBA_ACPI_VERSION);
|
||||
p += sprintf(p, "proc_interface: %d\n",
|
||||
PROC_INTERFACE_VERSION);
|
||||
return p;
|
||||
}
|
||||
|
||||
/* proc and module init
|
||||
*/
|
||||
|
||||
#define PROC_TOSHIBA "toshiba"
|
||||
|
||||
static ProcItem proc_items[] =
|
||||
{
|
||||
{ "lcd" , read_lcd , write_lcd },
|
||||
{ "video" , read_video , write_video },
|
||||
{ "fan" , read_fan , write_fan },
|
||||
{ "keys" , read_keys , write_keys },
|
||||
{ "version" , read_version , NULL },
|
||||
{ NULL }
|
||||
};
|
||||
|
||||
static acpi_status __init
|
||||
add_device(void)
|
||||
{
|
||||
struct proc_dir_entry* proc;
|
||||
ProcItem* item;
|
||||
|
||||
for (item = proc_items; item->name; ++item)
|
||||
{
|
||||
proc = create_proc_read_entry(item->name,
|
||||
S_IFREG | S_IRUGO | S_IWUSR,
|
||||
toshiba_proc_dir, (read_proc_t*)dispatch_read, item);
|
||||
if (proc)
|
||||
proc->owner = THIS_MODULE;
|
||||
if (proc && item->write_func)
|
||||
proc->write_proc = (write_proc_t*)dispatch_write;
|
||||
}
|
||||
|
||||
return AE_OK;
|
||||
}
|
||||
|
||||
static acpi_status __exit
|
||||
remove_device(void)
|
||||
{
|
||||
ProcItem* item;
|
||||
|
||||
for (item = proc_items; item->name; ++item)
|
||||
remove_proc_entry(item->name, toshiba_proc_dir);
|
||||
return AE_OK;
|
||||
}
|
||||
|
||||
static int __init
|
||||
toshiba_acpi_init(void)
|
||||
{
|
||||
acpi_status status = AE_OK;
|
||||
u32 hci_result;
|
||||
|
||||
if (acpi_disabled)
|
||||
return -ENODEV;
|
||||
/* 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(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;
|
||||
|
||||
/* enable event fifo */
|
||||
hci_write1(HCI_SYSTEM_EVENT, 1, &hci_result);
|
||||
|
||||
toshiba_proc_dir = proc_mkdir(PROC_TOSHIBA, acpi_root_dir);
|
||||
if (!toshiba_proc_dir) {
|
||||
status = AE_ERROR;
|
||||
} else {
|
||||
toshiba_proc_dir->owner = THIS_MODULE;
|
||||
status = add_device();
|
||||
if (ACPI_FAILURE(status))
|
||||
remove_proc_entry(PROC_TOSHIBA, acpi_root_dir);
|
||||
}
|
||||
|
||||
return (ACPI_SUCCESS(status)) ? 0 : -ENODEV;
|
||||
}
|
||||
|
||||
static void __exit
|
||||
toshiba_acpi_exit(void)
|
||||
{
|
||||
remove_device();
|
||||
|
||||
if (toshiba_proc_dir)
|
||||
remove_proc_entry(PROC_TOSHIBA, acpi_root_dir);
|
||||
|
||||
return;
|
||||
}
|
||||
|
||||
module_init(toshiba_acpi_init);
|
||||
module_exit(toshiba_acpi_exit);
|
||||
Reference in New Issue
Block a user