diff options
| -rw-r--r-- | arch/x86/platform/olpc/olpc-xo15-sci.c | 72 |
1 files changed, 71 insertions, 1 deletions
diff --git a/arch/x86/platform/olpc/olpc-xo15-sci.c b/arch/x86/platform/olpc/olpc-xo15-sci.c index 2b235b77d9a..23e5b9d7977 100644 --- a/arch/x86/platform/olpc/olpc-xo15-sci.c +++ b/arch/x86/platform/olpc/olpc-xo15-sci.c @@ -23,7 +23,66 @@ #define XO15_SCI_CLASS DRV_NAME #define XO15_SCI_DEVICE_NAME "OLPC XO-1.5 SCI" -static unsigned long xo15_sci_gpe; +static unsigned long xo15_sci_gpe; +static bool lid_wake_on_close; + +/* + * The normal ACPI LID wakeup behavior is wake-on-open, but not + * wake-on-close. This is implemented as standard by the XO-1.5 DSDT. + * + * We provide here a sysfs attribute that will additionally enable + * wake-on-close behavior. This is useful (e.g.) when we oportunistically + * suspend with the display running; if the lid is then closed, we want to + * wake up to turn the display off. + * + * This is controlled through a custom method in the XO-1.5 DSDT. + */ +static int set_lid_wake_behavior(bool wake_on_close) +{ + struct acpi_object_list arg_list; + union acpi_object arg; + acpi_status status; + + arg_list.count = 1; + arg_list.pointer = &arg; + arg.type = ACPI_TYPE_INTEGER; + arg.integer.value = wake_on_close; + + status = acpi_evaluate_object(NULL, "\\_SB.PCI0.LID.LIDW", &arg_list, NULL); + if (ACPI_FAILURE(status)) { + pr_warning(PFX "failed to set lid behavior\n"); + return 1; + } + + lid_wake_on_close = wake_on_close; + + return 0; +} + +static ssize_t +lid_wake_on_close_show(struct kobject *s, struct kobj_attribute *attr, char *buf) +{ + return sprintf(buf, "%u\n", lid_wake_on_close); +} + +static ssize_t lid_wake_on_close_store(struct kobject *s, + struct kobj_attribute *attr, + const char *buf, size_t n) +{ + unsigned int val; + + if (sscanf(buf, "%u", &val) != 1) + return -EINVAL; + + set_lid_wake_behavior(!!val); + + return n; +} + +static struct kobj_attribute lid_wake_on_close_attr = + __ATTR(lid_wake_on_close, 0644, + lid_wake_on_close_show, + lid_wake_on_close_store); static void battery_status_changed(void) { @@ -91,6 +150,7 @@ static int xo15_sci_add(struct acpi_device *device) { unsigned long long tmp; acpi_status status; + int r; if (!device) return -EINVAL; @@ -112,6 +172,10 @@ static int xo15_sci_add(struct acpi_device *device) dev_info(&device->dev, "Initialized, GPE = 0x%lx\n", xo15_sci_gpe); + r = sysfs_create_file(&device->dev.kobj, &lid_wake_on_close_attr.attr); + if (r) + goto err_sysfs; + /* Flush queue, and enable all SCI events */ process_sci_queue(); olpc_ec_mask_write(EC_SCI_SRC_ALL); @@ -123,6 +187,11 @@ static int xo15_sci_add(struct acpi_device *device) device_init_wakeup(&device->dev, true); return 0; + +err_sysfs: + acpi_remove_gpe_handler(NULL, xo15_sci_gpe, xo15_sci_gpe_handler); + cancel_work_sync(&sci_work); + return r; } static int xo15_sci_remove(struct acpi_device *device, int type) @@ -130,6 +199,7 @@ static int xo15_sci_remove(struct acpi_device *device, int type) acpi_disable_gpe(NULL, xo15_sci_gpe); acpi_remove_gpe_handler(NULL, xo15_sci_gpe, xo15_sci_gpe_handler); cancel_work_sync(&sci_work); + sysfs_remove_file(&device->dev.kobj, &lid_wake_on_close_attr.attr); return 0; } |