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bbswitch-g14
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Merge branch 'master' into hack-lenovo

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hack-lenovo
Peter Wu 12 years ago
parent f5a4f5f364 b12b017f3a
commit 2d00d70ec7
3 changed files with 89 additions and 42 deletions
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21
Makefile
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@ -5,12 +5,27 @@ KVERSION := $(shell uname -r)
KDIR := /lib/modules/$(KVERSION)/build
PWD := "$$(pwd)"
ifdef DEBUG
CFLAGS_$(obj-m) := -DDEBUG
endif
default:
$(MAKE) -C $(KDIR) M=$(PWD) modules
clean:
$(MAKE) -C $(KDIR) M=$(PWD) clean
$(MAKE) O=$(PWD) -C $(KDIR) M=$(PWD) clean
load:
-/sbin/rmmod $(modname)
/sbin/insmod $(modname).ko
-rmmod $(modname)
insmod $(modname).ko
install:
mkdir -p /lib/modules/$(KVERSION)/misc/$(modname)
install -m 0755 -o root -g root $(modname).ko /lib/modules/$(KVERSION)/misc/$(modname)
depmod -a
uninstall:
rm /lib/modules/$(KVERSION)/misc/$(modname)/$(modname).ko
rmdir /lib/modules/$(KVERSION)/misc/$(modname)
rmdir /lib/modules/$(KVERSION)/misc
depmod -a

5
NEWS
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@ -1,4 +1,9 @@
Version 0.5 - 22 October 2012
* Improved compatibility with older DKMS versions.
* Set device state to D3cold instead of D3hot.
* Only print DSM method call results when debugging is enabled.
* Fixed runtime power management regression in Linux 3.6.
Version 0.4.2 - 26 April 2012

105
bbswitch.c
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@ -9,14 +9,17 @@
* Get status
* # cat /proc/acpi/bbswitch
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/pci.h>
#include <linux/acpi.h>
#include <linux/module.h>
#include <asm/uaccess.h>
#include <linux/suspend.h>
#include <linux/seq_file.h>
#include <linux/pm_runtime.h>
#define BBSWITCH_VERSION "0.4.2"
#define BBSWITCH_VERSION "0.5"
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Toggle the discrete graphics card");
@ -69,7 +72,7 @@ static acpi_handle dis_handle;
/* used for keeping the PM event handler */
static struct notifier_block nb;
/* whether the card was off before suspend or not; on: 0, off: 1 */
int dis_before_suspend_disabled;
static int dis_before_suspend_disabled;
static char *buffer_to_string(const char *buffer, size_t n, char *target) {
int i;
@ -114,8 +117,7 @@ static int acpi_call_dsm(acpi_handle handle, const char muid[16], int revid,
char muid_str[5 * 16];
char args_str[5 * 4];
printk(KERN_WARNING "bbswitch: failed to evaluate _DSM {%s} 0x%X 0x%X"
" {%s}: %s\n",
pr_warn("failed to evaluate _DSM {%s} 0x%X 0x%X {%s}: %s\n",
buffer_to_string(muid, 16, muid_str), revid, func,
buffer_to_string(args, 4, args_str), acpi_format_exception(err));
return err;
@ -134,8 +136,8 @@ static int acpi_call_dsm(acpi_handle handle, const char muid[16], int revid,
*result |= (obj->buffer.pointer[3] << 24);
}
} else {
printk(KERN_WARNING "bbswitch: _DSM call yields an unsupported result"
" type: %X\n", obj->type);
pr_warn("_DSM call yields an unsupported result type: %#x\n",
obj->type);
}
kfree(output.pointer);
@ -165,8 +167,7 @@ static int bbswitch_optimus_dsm(void) {
// failure
return 1;
}
printk(KERN_DEBUG "bbswitch: Result of Optimus _DSM call: %08X\n",
result);
pr_debug("Result of Optimus _DSM call: %08X\n", result);
}
return 0;
}
@ -181,8 +182,7 @@ static int bbswitch_acpi_off(void) {
// failure
return 1;
}
printk(KERN_DEBUG "bbswitch: Result of _DSM call for OFF: %08X\n",
result);
pr_debug("Result of _DSM call for OFF: %08X\n", result);
}
return 0;
}
@ -197,8 +197,7 @@ static int bbswitch_acpi_on(void) {
// failure
return 1;
}
printk(KERN_DEBUG "bbswitch: Result of _DSM call for ON: %08X\n",
result);
pr_debug("Result of _DSM call for ON: %08X\n", result);
}
return 0;
}
@ -221,47 +220,54 @@ static void bbswitch_off(void) {
// to prevent the system from possibly locking up, don't disable the device
// if it's still in use by a driver (i.e. nouveau or nvidia)
if (dis_dev->driver) {
printk(KERN_WARNING "bbswitch: device %s is in use by driver '%s', "
"refusing OFF\n", dev_name(&dis_dev->dev), dis_dev->driver->name);
pr_warn("device %s is in use by driver '%s', refusing OFF\n",
dev_name(&dis_dev->dev), dis_dev->driver->name);
return;
}
printk(KERN_INFO "bbswitch: disabling discrete graphics\n");
pr_info("disabling discrete graphics\n");
if (bbswitch_optimus_dsm()) {
printk(KERN_WARNING "bbswitch: Optimus ACPI call failed, the device is"
" not disabled\n");
pr_warn("Optimus ACPI call failed, the device is not disabled\n");
return;
}
pci_save_state(dis_dev);
pci_clear_master(dis_dev);
pci_disable_device(dis_dev);
pci_set_power_state(dis_dev, PCI_D3hot);
pci_set_power_state(dis_dev, PCI_D3cold);
if (bbswitch_acpi_off())
printk(KERN_WARNING "bbswitch: The discrete card could not be disabled"
" by a _DSM call\n");
pr_warn("The discrete card could not be disabled by a _DSM call\n");
}
static void bbswitch_on(void) {
if (!is_card_disabled())
return;
printk(KERN_INFO "bbswitch: enabling discrete graphics\n");
pr_info("enabling discrete graphics\n");
if (bbswitch_acpi_on())
printk(KERN_WARNING "bbswitch: The discrete card could not be enabled"
" by a _DSM call\n");
pr_warn("The discrete card could not be enabled by a _DSM call\n");
pci_set_power_state(dis_dev, PCI_D0);
pci_restore_state(dis_dev);
if (pci_enable_device(dis_dev))
printk(KERN_WARNING "bbswitch: failed to enable %s\n",
dev_name(&dis_dev->dev));
pr_warn("failed to enable %s\n", dev_name(&dis_dev->dev));
pci_set_master(dis_dev);
}
/* power bus so we can read PCI configuration space */
static void dis_dev_get(void) {
if (dis_dev->bus && dis_dev->bus->self)
pm_runtime_get_sync(&dis_dev->bus->self->dev);
}
static void dis_dev_put(void) {
if (dis_dev->bus && dis_dev->bus->self)
pm_runtime_put_sync(&dis_dev->bus->self->dev);
}
static ssize_t bbswitch_proc_write(struct file *fp, const char __user *buff,
size_t len, loff_t *off) {
char cmd[8];
@ -272,19 +278,25 @@ static ssize_t bbswitch_proc_write(struct file *fp, const char __user *buff,
if (copy_from_user(cmd, buff, len))
return -EFAULT;
dis_dev_get();
if (strncmp(cmd, "OFF", 3) == 0)
bbswitch_off();
if (strncmp(cmd, "ON", 2) == 0)
bbswitch_on();
dis_dev_put();
return len;
}
static int bbswitch_proc_show(struct seq_file *seqfp, void *p) {
// show the card state. Example output: 0000:01:00:00 ON
dis_dev_get();
seq_printf(seqfp, "%s %s\n", dev_name(&dis_dev->dev),
is_card_disabled() ? "OFF" : "ON");
dis_dev_put();
return 0;
}
static int bbswitch_proc_open(struct inode *inode, struct file *file) {
@ -296,19 +308,24 @@ static int bbswitch_pm_handler(struct notifier_block *nbp,
switch (event_type) {
case PM_HIBERNATION_PREPARE:
case PM_SUSPEND_PREPARE:
dis_dev_get();
dis_before_suspend_disabled = is_card_disabled();
// enable the device before suspend to avoid the PCI config space from
// being saved incorrectly
if (dis_before_suspend_disabled)
bbswitch_on();
dis_dev_put();
break;
case PM_POST_HIBERNATION:
case PM_POST_SUSPEND:
case PM_POST_RESTORE:
// after suspend, the card is on, but if it was off before suspend,
// disable it again
if (dis_before_suspend_disabled)
if (dis_before_suspend_disabled) {
dis_dev_get();
bbswitch_off();
dis_dev_put();
}
break;
case PM_RESTORE_PREPARE:
// deliberately don't do anything as it does not occur before suspend
@ -332,7 +349,7 @@ static int __init bbswitch_init(void) {
struct pci_dev *pdev = NULL;
acpi_handle igd_handle = NULL;
printk(KERN_INFO "bbswitch: version %s\n", BBSWITCH_VERSION);
pr_info("version %s\n", BBSWITCH_VERSION);
while ((pdev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, pdev)) != NULL) {
struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
@ -345,8 +362,8 @@ static int __init bbswitch_init(void) {
handle = DEVICE_ACPI_HANDLE(&pdev->dev);
if (!handle) {
printk(KERN_WARNING "bbswitch: cannot find ACPI handle for VGA"
" device %s\n", dev_name(&pdev->dev));
pr_warn("cannot find ACPI handle for VGA device %s\n",
dev_name(&pdev->dev));
continue;
}
@ -354,56 +371,60 @@ static int __init bbswitch_init(void) {
if (pdev->vendor == PCI_VENDOR_ID_INTEL) {
igd_handle = handle;
printk(KERN_INFO "bbswitch: Found integrated VGA device %s: %s\n",
pr_info("Found integrated VGA device %s: %s\n",
dev_name(&pdev->dev), (char *)buf.pointer);
} else {
dis_dev = pdev;
dis_handle = handle;
printk(KERN_INFO "bbswitch: Found discrete VGA device %s: %s\n",
pr_info("Found discrete VGA device %s: %s\n",
dev_name(&pdev->dev), (char *)buf.pointer);
}
kfree(buf.pointer);
}
if (dis_dev == NULL) {
printk(KERN_ERR "bbswitch: No discrete VGA device found\n");
pr_err("No discrete VGA device found\n");
return -ENODEV;
}
if (has_dsm_func(acpi_optimus_dsm_muid, 0x100, 0x1A)) {
dsm_type = DSM_TYPE_OPTIMUS;
printk(KERN_INFO "bbswitch: detected an Optimus _DSM function\n");
pr_info("detected an Optimus _DSM function\n");
} else if (has_dsm_func(acpi_nvidia_dsm_muid, 0x102, 0x3)) {
dsm_type = DSM_TYPE_NVIDIA;
printk(KERN_INFO "bbswitch: detected a nVidia _DSM function\n");
pr_info("detected a nVidia _DSM function\n");
} else {
/* At least two Acer machines are known to use the intel ACPI handle
* with the legacy nvidia DSM */
dis_handle = igd_handle;
if (has_dsm_func(acpi_nvidia_dsm_muid, 0x102, 0x3)) {
dsm_type = DSM_TYPE_NVIDIA;
printk(KERN_INFO "bbswitch: detected a nVidia _DSM function on the"
pr_info("detected a nVidia _DSM function on the"
" integrated video card\n");
} else {
printk(KERN_ERR "bbswitch: No suitable _DSM call found.\n");
pr_err("No suitable _DSM call found.\n");
return -ENODEV;
}
}
acpi_entry = proc_create("bbswitch", 0664, acpi_root_dir, &bbswitch_fops);
if (acpi_entry == NULL) {
printk(KERN_ERR "bbswitch: Couldn't create proc entry\n");
pr_err("Couldn't create proc entry\n");
return -ENOMEM;
}
dis_dev_get();
if (load_state == CARD_ON)
bbswitch_on();
else if (load_state == CARD_OFF)
bbswitch_off();
printk(KERN_INFO "bbswitch: Succesfully loaded. Discrete card %s is %s\n",
pr_info("Succesfully loaded. Discrete card %s is %s\n",
dev_name(&dis_dev->dev), is_card_disabled() ? "off" : "on");
dis_dev_put();
nb.notifier_call = &bbswitch_pm_handler;
register_pm_notifier(&nb);
@ -413,17 +434,23 @@ static int __init bbswitch_init(void) {
static void __exit bbswitch_exit(void) {
remove_proc_entry("bbswitch", acpi_root_dir);
dis_dev_get();
if (unload_state == CARD_ON)
bbswitch_on();
else if (unload_state == CARD_OFF)
bbswitch_off();
printk(KERN_INFO "bbswitch: Unloaded. Discrete card %s is %s\n",
pr_info("Unloaded. Discrete card %s is %s\n",
dev_name(&dis_dev->dev), is_card_disabled() ? "off" : "on");
dis_dev_put();
if (nb.notifier_call)
unregister_pm_notifier(&nb);
}
module_init(bbswitch_init);
module_exit(bbswitch_exit);
/* vim: set sw=4 ts=4 et: */

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