shark/bbswitch-g14
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Base on/off state on the device state, not a hardcoded flag

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This commit is contained in:
Lekensteyn
2011-12-10 22:17:57 +01:00
parent 0bd5ce93d7
commit 1b3bc0b862
1 changed files with 19 additions and 9 deletions
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28
bbswitch.c
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@@ -22,7 +22,6 @@ static const char acpi_optimus_dsm_muid[] = {
static struct pci_dev *dis_dev;
static acpi_handle dis_handle;
static int dis_enabled = 1;
/* shamelessly taken from nouveau_acpi.c */
static int acpi_optimus_dsm(acpi_handle handle, int func, char *args,
@@ -88,8 +87,19 @@ static void bbswitch_acpi_on(void) {
}
// Returns 1 if the card is disabled, 0 if enabled
static int is_card_disabled(void) {
u32 cfg_word;
// read first config word which contains Vendor and Device ID. If all bits
// are enabled, the device is assumed to be off
pci_read_config_dword(dis_dev, 0, &cfg_word);
// if one of the bits is not enabled (the card is enabled), the inverted
// result will be non-zero and hence logical not will make it 0 ("false")
return !~cfg_word;
}
static void bbswitch_off(void) {
if (!dis_enabled)
if (is_card_disabled())
return;
printk(KERN_INFO "bbswitch: disabling discrete graphics\n");
@@ -100,12 +110,10 @@ static void bbswitch_off(void) {
pci_set_power_state(dis_dev, PCI_D3hot);
bbswitch_acpi_off();
dis_enabled = 0;
}
static void bbswitch_on(void) {
if (dis_enabled)
if (!is_card_disabled())
return;
printk(KERN_INFO "bbswitch: enabling discrete graphics\n");
@@ -118,8 +126,6 @@ static void bbswitch_on(void) {
printk(KERN_WARNING "bbswitch: failed to enable %s\n",
dev_name(&dis_dev->dev));
pci_set_master(dis_dev);
dis_enabled = 1;
}
static int bbswitch_write(struct file *filp, const char __user *buff,
@@ -145,8 +151,9 @@ static int bbswitch_write(struct file *filp, const char __user *buff,
static int bbswitch_read(char *page, char **start, off_t off,
int count, int *eof, void *data) {
int len = 0;
return len;
// show the card state. Example output: 0000:01:00:00 ON
return snprintf(page, count, "%s %s\n", dev_name(&dis_dev->dev),
is_card_disabled() ? "OFF" : "ON");
}
static int __init bbswitch_init(void) {
@@ -183,6 +190,9 @@ static int __init bbswitch_init(void) {
return -ENOMEM;
}
printk(KERN_INFO "bbswitch: Succesfully loaded. Discrete card %s is %s\n",
dev_name(&dis_dev->dev), is_card_disabled() ? "off" : "on");
acpi_entry->write_proc = bbswitch_write;
acpi_entry->read_proc = bbswitch_read;