@@ -35,6 +35,7 @@
#include <linux/pci.h>
#include <linux/pci_hotplug.h>
#include <linux/leds.h>
+#include <linux/dmi.h>
#define EEEPC_LAPTOP_VERSION "0.1"
#define EEEPC_LAPTOP_NAME "Eee PC Hotkey Driver"
@@ -159,6 +160,7 @@ struct eeepc_laptop {
acpi_handle handle; /* the handle of the acpi device */
u32 cm_supported; /* the control methods supported
by this BIOS */
+ bool cpufv_disabled;
u16 event_count[128]; /* count for each event */
struct platform_device *platform_device;
@@ -378,6 +380,8 @@ static ssize_t store_cpufv(struct device *dev,
struct eeepc_cpufv c;
int rv, value;
+ if (eeepc->cpufv_disabled)
+ return -EPERM;
if (get_cpufv(eeepc, &c))
return -ENODEV;
rv = parse_arg(buf, count, &value);
@@ -389,6 +393,41 @@ static ssize_t store_cpufv(struct device *dev,
return rv;
}
+static ssize_t show_cpufv_disabled(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct eeepc_laptop *eeepc = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%d\n", eeepc->cpufv_disabled);
+}
+
+static ssize_t store_cpufv_disabled(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct eeepc_laptop *eeepc = dev_get_drvdata(dev);
+ int rv, value;
+
+ rv = parse_arg(buf, count, &value);
+ if (rv < 0)
+ return rv;
+
+ switch (value) {
+ case 0:
+ if (eeepc->cpufv_disabled)
+ pr_warning("cpufv enabled (not officially supported "
+ "on this model)\n");
+ eeepc->cpufv_disabled = false;
+ return rv;
+ case 1:
+ return -EPERM;
+ default:
+ return -EINVAL;
+ }
+}
+
+
static struct device_attribute dev_attr_cpufv = {
.attr = {
.name = "cpufv",
@@ -404,12 +443,22 @@ static struct device_attribute dev_attr_available_cpufv = {
.show = show_available_cpufv
};
+static struct device_attribute dev_attr_cpufv_disabled = {
+ .attr = {
+ .name = "cpufv_disabled",
+ .mode = 0644 },
+ .show = show_cpufv_disabled,
+ .store = store_cpufv_disabled
+};
+
+
static struct attribute *platform_attributes[] = {
&dev_attr_camera.attr,
&dev_attr_cardr.attr,
&dev_attr_disp.attr,
&dev_attr_cpufv.attr,
&dev_attr_available_cpufv.attr,
+ &dev_attr_cpufv_disabled.attr,
NULL
};
@@ -1261,6 +1310,42 @@ static void eeepc_acpi_notify(struct acpi_device *device, u32 event)
}
}
+static void eeepc_dmi_check(struct eeepc_laptop *eeepc)
+{
+ const char *model;
+
+ /*
+ * Blacklist for setting cpufv (cpu speed).
+ *
+ * EeePC 4G ("701") implements CFVS, but it is not supported
+ * by the pre-installed OS, and the original option to change it
+ * in the BIOS setup screen was removed in later versions.
+ *
+ * Judging by the lack of "Super Hybrid Engine" on Asus product pages,
+ * this applies to all "701" models (4G/4G Surf/2G Surf).
+ *
+ * So Asus made a deliberate decision not to support it on this model.
+ * We have several reports that using it can cause the system to hang
+ *
+ * The hang has also been reported on a "702" (Model name "8G"?).
+ *
+ * We avoid dmi_check_system() / dmi_match(), because they use
+ * substring matching. We don't want to affect the "701SD"
+ * and "701SDX" models, because they do support S.H.E.
+ */
+
+ model = dmi_get_system_info(DMI_PRODUCT_NAME);
+ if (!model)
+ return;
+
+ if (strcmp(model, "701") == 0 || strcmp(model, "702") == 0) {
+ eeepc->cpufv_disabled = true;
+ pr_info("model %s does not officially support setting cpu "
+ "speed\n", model);
+ pr_info("cpufv disabled to avoid instability\n");
+ }
+}
+
static void cmsg_quirk(struct eeepc_laptop *eeepc, int cm, const char *name)
{
int dummy;
@@ -1342,6 +1427,8 @@ static int __devinit eeepc_acpi_add(struct acpi_device *device)
strcpy(acpi_device_class(device), EEEPC_ACPI_CLASS);
device->driver_data = eeepc;
+ eeepc_dmi_check(eeepc);
+
result = eeepc_acpi_init(eeepc, device);
if (result)
goto fail_platform;