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98 lines
2.8 KiB
C
98 lines
2.8 KiB
C
9 years ago
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/*
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* TODO merge into main bbswitch module.
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* TODO on ON call device_release_driver
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* TODO how to bind to a specific device from kernel space? Can't use
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* driver_probe_device (https://lkml.org/lkml/2014/2/14/628). Maybe use
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* driver_override or new_id/bind/remove_id from userspace?
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/pci.h>
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#include <linux/module.h>
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#include <linux/pm_runtime.h>
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#include <linux/delay.h>
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Toggle the discrete graphics card (PCI driver)");
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MODULE_AUTHOR("Peter Wu <peter@lekensteyn.nl>");
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static int bbswitch_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
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{
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/* TODO how to discover devices? */
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/* Prevent kernel from detaching the PCI device for some devices that
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* generate hotplug events. The graphics card is typically not physically
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* removable. */
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pci_ignore_hotplug(dev);
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pm_runtime_set_active(&dev->dev); /* clear any errors */
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pm_runtime_allow(&dev->dev);
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pm_runtime_put_noidle(&dev->dev);
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return 0;
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}
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static void bbswitch_pci_remove(struct pci_dev *dev)
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{
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pm_runtime_get_noresume(&dev->dev);
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}
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static int bbswitch_runtime_suspend(struct device *dev) {
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struct pci_dev *pdev = to_pci_dev(dev);
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pr_info("disabling discrete graphics\n");
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/* TODO if _PR3 is not supported, call Optimus DSM here. */
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/* TODO for v1 Optimus, call DSM here. */
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/* Save state now that the device is still awake, makes PCI layer happy */
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pci_save_state(pdev);
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/* TODO if _PR3 is supported, should this be PCI_D3hot? */
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pci_set_power_state(pdev, PCI_D3cold);
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mdelay(1000);
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return 0;
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}
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static int bbswitch_runtime_resume(struct device *dev) {
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pr_info("enabling discrete graphics\n");
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/* TODO for v1 Optimus, call DSM here. */
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/* Nothing to do for Optimus, the PCI layer already moved into D0 state. */
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mdelay(1000);
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return 0;
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}
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static struct dev_pm_ops bbswitch_pm_ops = {
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.runtime_suspend = bbswitch_runtime_suspend,
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.runtime_resume = bbswitch_runtime_resume,
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/* No runtime_idle callback, the default zero delay is sufficient. */
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};
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static struct pci_driver bbswitch_pci_driver = {
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.name = KBUILD_MODNAME,
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.id_table = NULL, /* will be added dynamically */
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.probe = bbswitch_pci_probe,
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.remove = bbswitch_pci_remove,
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.driver.pm = &bbswitch_pm_ops,
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};
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static int __init bbswitch_dev_init(void) {
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int ret;
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ret = pci_register_driver(&bbswitch_pci_driver);
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#if 0
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ret = pci_add_dynid(&bbswitch_pci_driver, PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID,
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PCI_ANY_ID, PCI_ANY_ID, PCI_BASE_CLASS_DISPLAY << 16, 0xff0000);
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#endif
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return ret;
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}
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static void __exit bbswitch_dev_exit(void) {
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pci_unregister_driver(&bbswitch_pci_driver);
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}
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module_init(bbswitch_dev_init);
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module_exit(bbswitch_dev_exit);
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/* vim: set sw=4 ts=4 et: */
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