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Platform: add Samsung Laptop platform driver
This adds the samsung-laptop driver to the kernel. It now supports all known Samsung laptops that use the SABI interface. Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Matthew Garrett <mjg@redhat.com>
This commit is contained in:
Greg Kroah-Hartman
Matthew Garrett
parent
298f19b254
commit
2d70b73ae5
19
Documentation/ABI/testing/sysfs-driver-samsung-laptop
Normal file
19
Documentation/ABI/testing/sysfs-driver-samsung-laptop
Normal file
@ -0,0 +1,19 @@
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What: /sys/devices/platform/samsung/performance_level
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Date: January 1, 2010
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KernelVersion: 2.6.33
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Contact: Greg Kroah-Hartman <gregkh@suse.de>
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Description: Some Samsung laptops have different "performance levels"
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that are can be modified by a function key, and by this
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sysfs file. These values don't always make a whole lot
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of sense, but some users like to modify them to keep
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their fans quiet at all costs. Reading from this file
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will show the current performance level. Writing to the
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file can change this value.
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Valid options:
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"silent"
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"normal"
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"overclock"
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Note that not all laptops support all of these options.
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Specifically, not all support the "overclock" option,
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and it's still unknown if this value even changes
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anything, other than making the user feel a bit better.
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@ -739,4 +739,17 @@ config XO15_EBOOK
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This switch is triggered as the screen is rotated and folded down to
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convert the device into ebook form.
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config SAMSUNG_LAPTOP
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tristate "Samsung Laptop driver"
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depends on RFKILL && BACKLIGHT_CLASS_DEVICE && X86
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---help---
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This module implements a driver for a wide range of different
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Samsung laptops. It offers control over the different
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function keys, wireless LED, LCD backlight level, and
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sometimes provides a "performance_control" sysfs file to allow
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the performance level of the laptop to be changed.
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To compile this driver as a module, choose M here: the module
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will be called samsung-laptop.
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endif # X86_PLATFORM_DEVICES
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@ -40,4 +40,5 @@ obj-$(CONFIG_GPIO_INTEL_PMIC) += intel_pmic_gpio.o
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obj-$(CONFIG_XO1_RFKILL) += xo1-rfkill.o
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obj-$(CONFIG_XO15_EBOOK) += xo15-ebook.o
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obj-$(CONFIG_IBM_RTL) += ibm_rtl.o
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obj-$(CONFIG_SAMSUNG_LAPTOP) += samsung-laptop.o
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obj-$(CONFIG_INTEL_MFLD_THERMAL) += intel_mid_thermal.o
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832
drivers/platform/x86/samsung-laptop.c
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832
drivers/platform/x86/samsung-laptop.c
Normal file
@ -0,0 +1,832 @@
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/*
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* Samsung Laptop driver
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*
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* Copyright (C) 2009,2011 Greg Kroah-Hartman (gregkh@suse.de)
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* Copyright (C) 2009,2011 Novell Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/pci.h>
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#include <linux/backlight.h>
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#include <linux/fb.h>
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#include <linux/dmi.h>
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#include <linux/platform_device.h>
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#include <linux/rfkill.h>
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/*
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* This driver is needed because a number of Samsung laptops do not hook
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* their control settings through ACPI. So we have to poke around in the
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* BIOS to do things like brightness values, and "special" key controls.
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*/
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/*
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* We have 0 - 8 as valid brightness levels. The specs say that level 0 should
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* be reserved by the BIOS (which really doesn't make much sense), we tell
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* userspace that the value is 0 - 7 and then just tell the hardware 1 - 8
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*/
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#define MAX_BRIGHT 0x07
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#define SABI_IFACE_MAIN 0x00
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#define SABI_IFACE_SUB 0x02
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#define SABI_IFACE_COMPLETE 0x04
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#define SABI_IFACE_DATA 0x05
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/* Structure to get data back to the calling function */
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struct sabi_retval {
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u8 retval[20];
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};
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struct sabi_header_offsets {
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u8 port;
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u8 re_mem;
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u8 iface_func;
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u8 en_mem;
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u8 data_offset;
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u8 data_segment;
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};
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struct sabi_commands {
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/*
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* Brightness is 0 - 8, as described above.
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* Value 0 is for the BIOS to use
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*/
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u8 get_brightness;
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u8 set_brightness;
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/*
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* first byte:
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* 0x00 - wireless is off
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* 0x01 - wireless is on
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* second byte:
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* 0x02 - 3G is off
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* 0x03 - 3G is on
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* TODO, verify 3G is correct, that doesn't seem right...
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*/
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u8 get_wireless_button;
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u8 set_wireless_button;
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/* 0 is off, 1 is on */
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u8 get_backlight;
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u8 set_backlight;
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/*
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* 0x80 or 0x00 - no action
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* 0x81 - recovery key pressed
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*/
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u8 get_recovery_mode;
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u8 set_recovery_mode;
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/*
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* on seclinux: 0 is low, 1 is high,
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* on swsmi: 0 is normal, 1 is silent, 2 is turbo
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*/
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u8 get_performance_level;
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u8 set_performance_level;
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/*
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* Tell the BIOS that Linux is running on this machine.
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* 81 is on, 80 is off
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*/
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u8 set_linux;
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};
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struct sabi_performance_level {
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const char *name;
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u8 value;
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};
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struct sabi_config {
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const char *test_string;
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u16 main_function;
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const struct sabi_header_offsets header_offsets;
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const struct sabi_commands commands;
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const struct sabi_performance_level performance_levels[4];
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u8 min_brightness;
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u8 max_brightness;
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};
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static const struct sabi_config sabi_configs[] = {
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{
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.test_string = "SECLINUX",
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.main_function = 0x4c49,
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.header_offsets = {
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.port = 0x00,
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.re_mem = 0x02,
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.iface_func = 0x03,
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.en_mem = 0x04,
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.data_offset = 0x05,
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.data_segment = 0x07,
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},
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.commands = {
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.get_brightness = 0x00,
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.set_brightness = 0x01,
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.get_wireless_button = 0x02,
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.set_wireless_button = 0x03,
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.get_backlight = 0x04,
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.set_backlight = 0x05,
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.get_recovery_mode = 0x06,
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.set_recovery_mode = 0x07,
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.get_performance_level = 0x08,
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.set_performance_level = 0x09,
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.set_linux = 0x0a,
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},
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.performance_levels = {
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{
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.name = "silent",
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.value = 0,
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},
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{
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.name = "normal",
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.value = 1,
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},
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{ },
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},
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.min_brightness = 1,
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.max_brightness = 8,
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},
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{
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.test_string = "SwSmi@",
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.main_function = 0x5843,
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.header_offsets = {
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.port = 0x00,
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.re_mem = 0x04,
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.iface_func = 0x02,
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.en_mem = 0x03,
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.data_offset = 0x05,
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.data_segment = 0x07,
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},
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.commands = {
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.get_brightness = 0x10,
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.set_brightness = 0x11,
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.get_wireless_button = 0x12,
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.set_wireless_button = 0x13,
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.get_backlight = 0x2d,
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.set_backlight = 0x2e,
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.get_recovery_mode = 0xff,
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.set_recovery_mode = 0xff,
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.get_performance_level = 0x31,
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.set_performance_level = 0x32,
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.set_linux = 0xff,
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},
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.performance_levels = {
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{
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.name = "normal",
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.value = 0,
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},
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{
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.name = "silent",
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.value = 1,
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},
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{
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.name = "overclock",
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.value = 2,
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},
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{ },
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},
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.min_brightness = 0,
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.max_brightness = 8,
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},
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{ },
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};
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static const struct sabi_config *sabi_config;
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static void __iomem *sabi;
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static void __iomem *sabi_iface;
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static void __iomem *f0000_segment;
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static struct backlight_device *backlight_device;
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static struct mutex sabi_mutex;
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static struct platform_device *sdev;
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static struct rfkill *rfk;
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static int force;
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module_param(force, bool, 0);
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MODULE_PARM_DESC(force,
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"Disable the DMI check and forces the driver to be loaded");
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static int debug;
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module_param(debug, bool, S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(debug, "Debug enabled or not");
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static int sabi_get_command(u8 command, struct sabi_retval *sretval)
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{
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int retval = 0;
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u16 port = readw(sabi + sabi_config->header_offsets.port);
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u8 complete, iface_data;
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mutex_lock(&sabi_mutex);
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/* enable memory to be able to write to it */
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outb(readb(sabi + sabi_config->header_offsets.en_mem), port);
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/* write out the command */
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writew(sabi_config->main_function, sabi_iface + SABI_IFACE_MAIN);
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writew(command, sabi_iface + SABI_IFACE_SUB);
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writeb(0, sabi_iface + SABI_IFACE_COMPLETE);
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outb(readb(sabi + sabi_config->header_offsets.iface_func), port);
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/* write protect memory to make it safe */
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outb(readb(sabi + sabi_config->header_offsets.re_mem), port);
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/* see if the command actually succeeded */
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complete = readb(sabi_iface + SABI_IFACE_COMPLETE);
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iface_data = readb(sabi_iface + SABI_IFACE_DATA);
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if (complete != 0xaa || iface_data == 0xff) {
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pr_warn("SABI get command 0x%02x failed with completion flag 0x%02x and data 0x%02x\n",
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command, complete, iface_data);
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retval = -EINVAL;
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goto exit;
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}
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/*
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* Save off the data into a structure so the caller use it.
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* Right now we only want the first 4 bytes,
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* There are commands that need more, but not for the ones we
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* currently care about.
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*/
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sretval->retval[0] = readb(sabi_iface + SABI_IFACE_DATA);
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sretval->retval[1] = readb(sabi_iface + SABI_IFACE_DATA + 1);
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sretval->retval[2] = readb(sabi_iface + SABI_IFACE_DATA + 2);
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sretval->retval[3] = readb(sabi_iface + SABI_IFACE_DATA + 3);
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exit:
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mutex_unlock(&sabi_mutex);
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return retval;
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}
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static int sabi_set_command(u8 command, u8 data)
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{
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int retval = 0;
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u16 port = readw(sabi + sabi_config->header_offsets.port);
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u8 complete, iface_data;
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mutex_lock(&sabi_mutex);
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/* enable memory to be able to write to it */
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outb(readb(sabi + sabi_config->header_offsets.en_mem), port);
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/* write out the command */
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writew(sabi_config->main_function, sabi_iface + SABI_IFACE_MAIN);
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writew(command, sabi_iface + SABI_IFACE_SUB);
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writeb(0, sabi_iface + SABI_IFACE_COMPLETE);
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writeb(data, sabi_iface + SABI_IFACE_DATA);
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outb(readb(sabi + sabi_config->header_offsets.iface_func), port);
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/* write protect memory to make it safe */
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outb(readb(sabi + sabi_config->header_offsets.re_mem), port);
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/* see if the command actually succeeded */
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complete = readb(sabi_iface + SABI_IFACE_COMPLETE);
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iface_data = readb(sabi_iface + SABI_IFACE_DATA);
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if (complete != 0xaa || iface_data == 0xff) {
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pr_warn("SABI set command 0x%02x failed with completion flag 0x%02x and data 0x%02x\n",
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command, complete, iface_data);
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retval = -EINVAL;
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}
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mutex_unlock(&sabi_mutex);
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return retval;
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}
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static void test_backlight(void)
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{
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struct sabi_retval sretval;
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sabi_get_command(sabi_config->commands.get_backlight, &sretval);
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printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]);
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sabi_set_command(sabi_config->commands.set_backlight, 0);
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printk(KERN_DEBUG "backlight should be off\n");
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sabi_get_command(sabi_config->commands.get_backlight, &sretval);
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printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]);
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msleep(1000);
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sabi_set_command(sabi_config->commands.set_backlight, 1);
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printk(KERN_DEBUG "backlight should be on\n");
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sabi_get_command(sabi_config->commands.get_backlight, &sretval);
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printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]);
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}
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static void test_wireless(void)
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{
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struct sabi_retval sretval;
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sabi_get_command(sabi_config->commands.get_wireless_button, &sretval);
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printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]);
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sabi_set_command(sabi_config->commands.set_wireless_button, 0);
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printk(KERN_DEBUG "wireless led should be off\n");
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sabi_get_command(sabi_config->commands.get_wireless_button, &sretval);
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printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]);
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msleep(1000);
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sabi_set_command(sabi_config->commands.set_wireless_button, 1);
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printk(KERN_DEBUG "wireless led should be on\n");
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sabi_get_command(sabi_config->commands.get_wireless_button, &sretval);
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printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]);
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}
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static u8 read_brightness(void)
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{
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struct sabi_retval sretval;
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int user_brightness = 0;
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int retval;
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retval = sabi_get_command(sabi_config->commands.get_brightness,
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&sretval);
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if (!retval) {
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user_brightness = sretval.retval[0];
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if (user_brightness != 0)
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user_brightness -= sabi_config->min_brightness;
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}
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return user_brightness;
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}
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static void set_brightness(u8 user_brightness)
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{
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u8 user_level = user_brightness - sabi_config->min_brightness;
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sabi_set_command(sabi_config->commands.set_brightness, user_level);
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}
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static int get_brightness(struct backlight_device *bd)
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{
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return (int)read_brightness();
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}
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static int update_status(struct backlight_device *bd)
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{
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set_brightness(bd->props.brightness);
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if (bd->props.power == FB_BLANK_UNBLANK)
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sabi_set_command(sabi_config->commands.set_backlight, 1);
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else
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sabi_set_command(sabi_config->commands.set_backlight, 0);
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return 0;
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}
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static const struct backlight_ops backlight_ops = {
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.get_brightness = get_brightness,
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.update_status = update_status,
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};
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static int rfkill_set(void *data, bool blocked)
|
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{
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/* Do something with blocked...*/
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/*
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* blocked == false is on
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* blocked == true is off
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*/
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if (blocked)
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sabi_set_command(sabi_config->commands.set_wireless_button, 0);
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else
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sabi_set_command(sabi_config->commands.set_wireless_button, 1);
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return 0;
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}
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static struct rfkill_ops rfkill_ops = {
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.set_block = rfkill_set,
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};
|
||||
|
||||
static int init_wireless(struct platform_device *sdev)
|
||||
{
|
||||
int retval;
|
||||
|
||||
rfk = rfkill_alloc("samsung-wifi", &sdev->dev, RFKILL_TYPE_WLAN,
|
||||
&rfkill_ops, NULL);
|
||||
if (!rfk)
|
||||
return -ENOMEM;
|
||||
|
||||
retval = rfkill_register(rfk);
|
||||
if (retval) {
|
||||
rfkill_destroy(rfk);
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void destroy_wireless(void)
|
||||
{
|
||||
rfkill_unregister(rfk);
|
||||
rfkill_destroy(rfk);
|
||||
}
|
||||
|
||||
static ssize_t get_performance_level(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct sabi_retval sretval;
|
||||
int retval;
|
||||
int i;
|
||||
|
||||
/* Read the state */
|
||||
retval = sabi_get_command(sabi_config->commands.get_performance_level,
|
||||
&sretval);
|
||||
if (retval)
|
||||
return retval;
|
||||
|
||||
/* The logic is backwards, yeah, lots of fun... */
|
||||
for (i = 0; sabi_config->performance_levels[i].name; ++i) {
|
||||
if (sretval.retval[0] == sabi_config->performance_levels[i].value)
|
||||
return sprintf(buf, "%s\n", sabi_config->performance_levels[i].name);
|
||||
}
|
||||
return sprintf(buf, "%s\n", "unknown");
|
||||
}
|
||||
|
||||
static ssize_t set_performance_level(struct device *dev,
|
||||
struct device_attribute *attr, const char *buf,
|
||||
size_t count)
|
||||
{
|
||||
if (count >= 1) {
|
||||
int i;
|
||||
for (i = 0; sabi_config->performance_levels[i].name; ++i) {
|
||||
const struct sabi_performance_level *level =
|
||||
&sabi_config->performance_levels[i];
|
||||
if (!strncasecmp(level->name, buf, strlen(level->name))) {
|
||||
sabi_set_command(sabi_config->commands.set_performance_level,
|
||||
level->value);
|
||||
break;
|
||||
}
|
||||
}
|
||||
if (!sabi_config->performance_levels[i].name)
|
||||
return -EINVAL;
|
||||
}
|
||||
return count;
|
||||
}
|
||||
static DEVICE_ATTR(performance_level, S_IWUSR | S_IRUGO,
|
||||
get_performance_level, set_performance_level);
|
||||
|
||||
|
||||
static int __init dmi_check_cb(const struct dmi_system_id *id)
|
||||
{
|
||||
pr_info("found laptop model '%s'\n",
|
||||
id->ident);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct dmi_system_id __initdata samsung_dmi_table[] = {
|
||||
{
|
||||
.ident = "N128",
|
||||
.matches = {
|
||||
DMI_MATCH(DMI_SYS_VENDOR,
|
||||
"SAMSUNG ELECTRONICS CO., LTD."),
|
||||
DMI_MATCH(DMI_PRODUCT_NAME, "N128"),
|
||||
DMI_MATCH(DMI_BOARD_NAME, "N128"),
|
||||
},
|
||||
.callback = dmi_check_cb,
|
||||
},
|
||||
{
|
||||
.ident = "N130",
|
||||
.matches = {
|
||||
DMI_MATCH(DMI_SYS_VENDOR,
|
||||
"SAMSUNG ELECTRONICS CO., LTD."),
|
||||
DMI_MATCH(DMI_PRODUCT_NAME, "N130"),
|
||||
DMI_MATCH(DMI_BOARD_NAME, "N130"),
|
||||
},
|
||||
.callback = dmi_check_cb,
|
||||
},
|
||||
{
|
||||
.ident = "X125",
|
||||
.matches = {
|
||||
DMI_MATCH(DMI_SYS_VENDOR,
|
||||
"SAMSUNG ELECTRONICS CO., LTD."),
|
||||
DMI_MATCH(DMI_PRODUCT_NAME, "X125"),
|
||||
DMI_MATCH(DMI_BOARD_NAME, "X125"),
|
||||
},
|
||||
.callback = dmi_check_cb,
|
||||
},
|
||||
{
|
||||
.ident = "X120/X170",
|
||||
.matches = {
|
||||
DMI_MATCH(DMI_SYS_VENDOR,
|
||||
"SAMSUNG ELECTRONICS CO., LTD."),
|
||||
DMI_MATCH(DMI_PRODUCT_NAME, "X120/X170"),
|
||||
DMI_MATCH(DMI_BOARD_NAME, "X120/X170"),
|
||||
},
|
||||
.callback = dmi_check_cb,
|
||||
},
|
||||
{
|
||||
.ident = "NC10",
|
||||
.matches = {
|
||||
DMI_MATCH(DMI_SYS_VENDOR,
|
||||
"SAMSUNG ELECTRONICS CO., LTD."),
|
||||
DMI_MATCH(DMI_PRODUCT_NAME, "NC10"),
|
||||
DMI_MATCH(DMI_BOARD_NAME, "NC10"),
|
||||
},
|
||||
.callback = dmi_check_cb,
|
||||
},
|
||||
{
|
||||
.ident = "NP-Q45",
|
||||
.matches = {
|
||||
DMI_MATCH(DMI_SYS_VENDOR,
|
||||
"SAMSUNG ELECTRONICS CO., LTD."),
|
||||
DMI_MATCH(DMI_PRODUCT_NAME, "SQ45S70S"),
|
||||
DMI_MATCH(DMI_BOARD_NAME, "SQ45S70S"),
|
||||
},
|
||||
.callback = dmi_check_cb,
|
||||
},
|
||||
{
|
||||
.ident = "X360",
|
||||
.matches = {
|
||||
DMI_MATCH(DMI_SYS_VENDOR,
|
||||
"SAMSUNG ELECTRONICS CO., LTD."),
|
||||
DMI_MATCH(DMI_PRODUCT_NAME, "X360"),
|
||||
DMI_MATCH(DMI_BOARD_NAME, "X360"),
|
||||
},
|
||||
.callback = dmi_check_cb,
|
||||
},
|
||||
{
|
||||
.ident = "R518",
|
||||
.matches = {
|
||||
DMI_MATCH(DMI_SYS_VENDOR,
|
||||
"SAMSUNG ELECTRONICS CO., LTD."),
|
||||
DMI_MATCH(DMI_PRODUCT_NAME, "R518"),
|
||||
DMI_MATCH(DMI_BOARD_NAME, "R518"),
|
||||
},
|
||||
.callback = dmi_check_cb,
|
||||
},
|
||||
{
|
||||
.ident = "R519/R719",
|
||||
.matches = {
|
||||
DMI_MATCH(DMI_SYS_VENDOR,
|
||||
"SAMSUNG ELECTRONICS CO., LTD."),
|
||||
DMI_MATCH(DMI_PRODUCT_NAME, "R519/R719"),
|
||||
DMI_MATCH(DMI_BOARD_NAME, "R519/R719"),
|
||||
},
|
||||
.callback = dmi_check_cb,
|
||||
},
|
||||
{
|
||||
.ident = "N150/N210/N220",
|
||||
.matches = {
|
||||
DMI_MATCH(DMI_SYS_VENDOR,
|
||||
"SAMSUNG ELECTRONICS CO., LTD."),
|
||||
DMI_MATCH(DMI_PRODUCT_NAME, "N150/N210/N220"),
|
||||
DMI_MATCH(DMI_BOARD_NAME, "N150/N210/N220"),
|
||||
},
|
||||
.callback = dmi_check_cb,
|
||||
},
|
||||
{
|
||||
.ident = "N150P/N210P/N220P",
|
||||
.matches = {
|
||||
DMI_MATCH(DMI_SYS_VENDOR,
|
||||
"SAMSUNG ELECTRONICS CO., LTD."),
|
||||
DMI_MATCH(DMI_PRODUCT_NAME, "N150P/N210P/N220P"),
|
||||
DMI_MATCH(DMI_BOARD_NAME, "N150P/N210P/N220P"),
|
||||
},
|
||||
.callback = dmi_check_cb,
|
||||
},
|
||||
{
|
||||
.ident = "R530/R730",
|
||||
.matches = {
|
||||
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
|
||||
DMI_MATCH(DMI_PRODUCT_NAME, "R530/R730"),
|
||||
DMI_MATCH(DMI_BOARD_NAME, "R530/R730"),
|
||||
},
|
||||
.callback = dmi_check_cb,
|
||||
},
|
||||
{
|
||||
.ident = "NF110/NF210/NF310",
|
||||
.matches = {
|
||||
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
|
||||
DMI_MATCH(DMI_PRODUCT_NAME, "NF110/NF210/NF310"),
|
||||
DMI_MATCH(DMI_BOARD_NAME, "NF110/NF210/NF310"),
|
||||
},
|
||||
.callback = dmi_check_cb,
|
||||
},
|
||||
{
|
||||
.ident = "N145P/N250P/N260P",
|
||||
.matches = {
|
||||
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
|
||||
DMI_MATCH(DMI_PRODUCT_NAME, "N145P/N250P/N260P"),
|
||||
DMI_MATCH(DMI_BOARD_NAME, "N145P/N250P/N260P"),
|
||||
},
|
||||
.callback = dmi_check_cb,
|
||||
},
|
||||
{
|
||||
.ident = "R70/R71",
|
||||
.matches = {
|
||||
DMI_MATCH(DMI_SYS_VENDOR,
|
||||
"SAMSUNG ELECTRONICS CO., LTD."),
|
||||
DMI_MATCH(DMI_PRODUCT_NAME, "R70/R71"),
|
||||
DMI_MATCH(DMI_BOARD_NAME, "R70/R71"),
|
||||
},
|
||||
.callback = dmi_check_cb,
|
||||
},
|
||||
{
|
||||
.ident = "P460",
|
||||
.matches = {
|
||||
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
|
||||
DMI_MATCH(DMI_PRODUCT_NAME, "P460"),
|
||||
DMI_MATCH(DMI_BOARD_NAME, "P460"),
|
||||
},
|
||||
.callback = dmi_check_cb,
|
||||
},
|
||||
{ },
|
||||
};
|
||||
MODULE_DEVICE_TABLE(dmi, samsung_dmi_table);
|
||||
|
||||
static int find_signature(void __iomem *memcheck, const char *testStr)
|
||||
{
|
||||
int i = 0;
|
||||
int loca;
|
||||
|
||||
for (loca = 0; loca < 0xffff; loca++) {
|
||||
char temp = readb(memcheck + loca);
|
||||
|
||||
if (temp == testStr[i]) {
|
||||
if (i == strlen(testStr)-1)
|
||||
break;
|
||||
++i;
|
||||
} else {
|
||||
i = 0;
|
||||
}
|
||||
}
|
||||
return loca;
|
||||
}
|
||||
|
||||
static int __init samsung_init(void)
|
||||
{
|
||||
struct backlight_properties props;
|
||||
struct sabi_retval sretval;
|
||||
unsigned int ifaceP;
|
||||
int i;
|
||||
int loca;
|
||||
int retval;
|
||||
|
||||
mutex_init(&sabi_mutex);
|
||||
|
||||
if (!force && !dmi_check_system(samsung_dmi_table))
|
||||
return -ENODEV;
|
||||
|
||||
f0000_segment = ioremap_nocache(0xf0000, 0xffff);
|
||||
if (!f0000_segment) {
|
||||
pr_err("Can't map the segment at 0xf0000\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/* Try to find one of the signatures in memory to find the header */
|
||||
for (i = 0; sabi_configs[i].test_string != 0; ++i) {
|
||||
sabi_config = &sabi_configs[i];
|
||||
loca = find_signature(f0000_segment, sabi_config->test_string);
|
||||
if (loca != 0xffff)
|
||||
break;
|
||||
}
|
||||
|
||||
if (loca == 0xffff) {
|
||||
pr_err("This computer does not support SABI\n");
|
||||
goto error_no_signature;
|
||||
}
|
||||
|
||||
/* point to the SMI port Number */
|
||||
loca += 1;
|
||||
sabi = (f0000_segment + loca);
|
||||
|
||||
if (debug) {
|
||||
printk(KERN_DEBUG "This computer supports SABI==%x\n",
|
||||
loca + 0xf0000 - 6);
|
||||
printk(KERN_DEBUG "SABI header:\n");
|
||||
printk(KERN_DEBUG " SMI Port Number = 0x%04x\n",
|
||||
readw(sabi + sabi_config->header_offsets.port));
|
||||
printk(KERN_DEBUG " SMI Interface Function = 0x%02x\n",
|
||||
readb(sabi + sabi_config->header_offsets.iface_func));
|
||||
printk(KERN_DEBUG " SMI enable memory buffer = 0x%02x\n",
|
||||
readb(sabi + sabi_config->header_offsets.en_mem));
|
||||
printk(KERN_DEBUG " SMI restore memory buffer = 0x%02x\n",
|
||||
readb(sabi + sabi_config->header_offsets.re_mem));
|
||||
printk(KERN_DEBUG " SABI data offset = 0x%04x\n",
|
||||
readw(sabi + sabi_config->header_offsets.data_offset));
|
||||
printk(KERN_DEBUG " SABI data segment = 0x%04x\n",
|
||||
readw(sabi + sabi_config->header_offsets.data_segment));
|
||||
}
|
||||
|
||||
/* Get a pointer to the SABI Interface */
|
||||
ifaceP = (readw(sabi + sabi_config->header_offsets.data_segment) & 0x0ffff) << 4;
|
||||
ifaceP += readw(sabi + sabi_config->header_offsets.data_offset) & 0x0ffff;
|
||||
sabi_iface = ioremap_nocache(ifaceP, 16);
|
||||
if (!sabi_iface) {
|
||||
pr_err("Can't remap %x\n", ifaceP);
|
||||
goto exit;
|
||||
}
|
||||
if (debug) {
|
||||
printk(KERN_DEBUG "ifaceP = 0x%08x\n", ifaceP);
|
||||
printk(KERN_DEBUG "sabi_iface = %p\n", sabi_iface);
|
||||
|
||||
test_backlight();
|
||||
test_wireless();
|
||||
|
||||
retval = sabi_get_command(sabi_config->commands.get_brightness,
|
||||
&sretval);
|
||||
printk(KERN_DEBUG "brightness = 0x%02x\n", sretval.retval[0]);
|
||||
}
|
||||
|
||||
/* Turn on "Linux" mode in the BIOS */
|
||||
if (sabi_config->commands.set_linux != 0xff) {
|
||||
retval = sabi_set_command(sabi_config->commands.set_linux,
|
||||
0x81);
|
||||
if (retval) {
|
||||
pr_warn("Linux mode was not set!\n");
|
||||
goto error_no_platform;
|
||||
}
|
||||
}
|
||||
|
||||
/* knock up a platform device to hang stuff off of */
|
||||
sdev = platform_device_register_simple("samsung", -1, NULL, 0);
|
||||
if (IS_ERR(sdev))
|
||||
goto error_no_platform;
|
||||
|
||||
/* create a backlight device to talk to this one */
|
||||
memset(&props, 0, sizeof(struct backlight_properties));
|
||||
props.max_brightness = sabi_config->max_brightness;
|
||||
backlight_device = backlight_device_register("samsung", &sdev->dev,
|
||||
NULL, &backlight_ops,
|
||||
&props);
|
||||
if (IS_ERR(backlight_device))
|
||||
goto error_no_backlight;
|
||||
|
||||
backlight_device->props.brightness = read_brightness();
|
||||
backlight_device->props.power = FB_BLANK_UNBLANK;
|
||||
backlight_update_status(backlight_device);
|
||||
|
||||
retval = init_wireless(sdev);
|
||||
if (retval)
|
||||
goto error_no_rfk;
|
||||
|
||||
retval = device_create_file(&sdev->dev, &dev_attr_performance_level);
|
||||
if (retval)
|
||||
goto error_file_create;
|
||||
|
||||
exit:
|
||||
return 0;
|
||||
|
||||
error_file_create:
|
||||
destroy_wireless();
|
||||
|
||||
error_no_rfk:
|
||||
backlight_device_unregister(backlight_device);
|
||||
|
||||
error_no_backlight:
|
||||
platform_device_unregister(sdev);
|
||||
|
||||
error_no_platform:
|
||||
iounmap(sabi_iface);
|
||||
|
||||
error_no_signature:
|
||||
iounmap(f0000_segment);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
static void __exit samsung_exit(void)
|
||||
{
|
||||
/* Turn off "Linux" mode in the BIOS */
|
||||
if (sabi_config->commands.set_linux != 0xff)
|
||||
sabi_set_command(sabi_config->commands.set_linux, 0x80);
|
||||
|
||||
device_remove_file(&sdev->dev, &dev_attr_performance_level);
|
||||
backlight_device_unregister(backlight_device);
|
||||
destroy_wireless();
|
||||
iounmap(sabi_iface);
|
||||
iounmap(f0000_segment);
|
||||
platform_device_unregister(sdev);
|
||||
}
|
||||
|
||||
module_init(samsung_init);
|
||||
module_exit(samsung_exit);
|
||||
|
||||
MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@suse.de>");
|
||||
MODULE_DESCRIPTION("Samsung Backlight driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
Loading…
Reference in New Issue
Block a user