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122 lines
3.8 KiB
C
122 lines
3.8 KiB
C
/**
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* Very ugly hack to work around a wrongly detected ACPI handle, see
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* https://bugzilla.kernel.org/show_bug.cgi?id=42696
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* https://bugzilla.kernel.org/show_bug.cgi?id=60829
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/acpi.h>
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#include <linux/dmi.h>
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Dirty ACPI handle hack for Lenovo IdeaPad Y[45]70");
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MODULE_AUTHOR("Peter Lekensteyn <lekensteyn@gmail.com>");
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MODULE_VERSION("0.0.2");
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static struct pci_dev *dis_dev;
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static acpi_handle orig_handle;
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/**
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* Returns true if the system needs an ACPI handle hack
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*/
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static bool __init need_acpi_handle_hack(void) {
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return dmi_match(DMI_PRODUCT_VERSION, "Lenovo IdeaPad Y470 ")
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|| dmi_match(DMI_PRODUCT_VERSION, "Lenovo IdeaPad Y480")
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|| dmi_match(DMI_PRODUCT_VERSION, "Lenovo IdeaPad Y570 ")
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|| dmi_match(DMI_PRODUCT_VERSION, "LENOVO IDEAPAD Y570 ") /* sys-product-name: PIQY0 */
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|| dmi_match(DMI_PRODUCT_VERSION, "Lenovo IdeaPad Y580")
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|| dmi_match(DMI_PRODUCT_VERSION, "Lenovo IdeaPad U510")
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|| dmi_match(DMI_PRODUCT_VERSION, "PSPLBE-01V00HFR") /* TOSHIBA SATELLITE P870 */
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|| dmi_match(DMI_PRODUCT_VERSION, "PSPLBA-02300S") /* TOSHIBA Satellite P870 */
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|| dmi_match(DMI_PRODUCT_VERSION, "PSPLFE-00E009FR") /* TOSHIBA Satellite P870 */
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|| dmi_match(DMI_PRODUCT_VERSION, "Lenovo G580")
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|| dmi_match(DMI_PRODUCT_VERSION, "Lenovo G780")
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|| dmi_match(DMI_PRODUCT_VERSION, "Lenovo IdeaPad Z500")
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|| (dmi_match(DMI_SYS_VENDOR, "LENOVO") && dmi_match(DMI_PRODUCT_NAME, "PIQY0")) /* Lenovo IdeaPad Y570 */
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|| dmi_match(DMI_PRODUCT_NAME, "Aspire V5-573G")
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;
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}
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static struct pci_dev __init *get_discrete_device(void) {
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struct pci_dev *pdev = NULL;
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while ((pdev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, pdev)) != NULL) {
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int pci_class = pdev->class >> 8;
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if (pci_class != PCI_CLASS_DISPLAY_VGA &&
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pci_class != PCI_CLASS_DISPLAY_3D)
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continue;
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if (pdev->vendor != PCI_VENDOR_ID_INTEL) {
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return pdev;
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}
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}
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return NULL;
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}
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/**
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* Very ugly hack to set the ACPI handle, do not use this as exemplary code!
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*/
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static void dev_set_acpi_handle(struct pci_dev *pdev, acpi_handle handle) {
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pdev->dev.archdata.acpi_handle = handle;
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}
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static int __init hack_apply(void) {
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acpi_handle tmp_handle, new_handle;
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struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
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if (!need_acpi_handle_hack()) {
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pr_err("Machine does not need ACPI handle hack\n");
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return -ENODEV;
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}
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dis_dev = get_discrete_device();
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if (!dis_dev) {
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pr_err("No discrete video card found\n");
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return -ENODEV;
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}
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orig_handle = DEVICE_ACPI_HANDLE(&dis_dev->dev);
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if (!orig_handle) {
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pr_err("No ACPI handle found for discrete video card\n");
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goto free_dev;
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}
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if (ACPI_FAILURE(acpi_get_name(orig_handle, ACPI_SINGLE_NAME, &buf))) {
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pr_err("Could not acquire name for discrete video card\n");
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goto free_dev;
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}
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if (strcmp((char *)buf.pointer, "PEGP") == 0) {
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pr_err("Handle has already been changed to PEGP\n");
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goto free_name;
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}
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/* \_SB.PCI0.PEG0.VGA_ -> \_SB.PCI0.PEG0.PEGP */
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if (ACPI_FAILURE(acpi_get_parent(orig_handle, &tmp_handle))) {
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pr_err("No parent device found for %s\n", (char *)buf.pointer);
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goto free_name;
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}
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if (ACPI_FAILURE(acpi_get_handle(tmp_handle, "PEGP", &new_handle))) {
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pr_err("No PEGP handle found on %s\n", (char *)buf.pointer);
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goto free_name;
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}
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pr_info("Setting new ACPI handle for discrete video card\n");
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dev_set_acpi_handle(dis_dev, new_handle);
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kfree(buf.pointer);
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pci_dev_put(dis_dev);
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return 0;
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free_name:
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kfree(buf.pointer);
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free_dev:
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pci_dev_put(dis_dev);
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return -ENODEV;
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}
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static void __exit hack_undo(void) {
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if (orig_handle) {
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pr_info("Restoring original ACPI handle for discrete"
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" video card\n");
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dev_set_acpi_handle(dis_dev, orig_handle);
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}
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}
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module_init(hack_apply);
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module_exit(hack_undo);
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