try again!

Required for 'struct proc_ops' since v5.7-rc1 with commit df23e2be3d24
("acpi: Remove header dependency").

bbswitch.c

@@ -31,10 +31,12 @@
 #include <linux/pci.h>
 #include <linux/acpi.h>
 #include <linux/module.h>
-#include <asm/uaccess.h>
+#include <linux/uaccess.h>
 #include <linux/suspend.h>
 #include <linux/seq_file.h>
 #include <linux/pm_runtime.h>
+#include <linux/proc_fs.h>
+#include <linux/version.h>
 
 #define BBSWITCH_VERSION "0.8"
 
@@ -285,7 +287,7 @@ static void bbswitch_on(void) {
         return;
 
     pr_info("enabling discrete graphics\n");
-
+    //pci_bridge_secondary_bus_reset(dis_dev);
     if (bbswitch_acpi_on())
         pr_warn("The discrete card could not be enabled by a _DSM call\n");
 
@@ -375,6 +377,15 @@ static int bbswitch_pm_handler(struct notifier_block *nbp,
     return 0;
 }
 
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 6, 0)
+static struct proc_ops bbswitch_fops = {
+    .proc_open   = bbswitch_proc_open,
+    .proc_read   = seq_read,
+    .proc_write  = bbswitch_proc_write,
+    .proc_lseek  = seq_lseek,
+    .proc_release= single_release
+};
+#else
 static struct file_operations bbswitch_fops = {
     .open   = bbswitch_proc_open,
     .read   = seq_read,
@@ -382,6 +393,7 @@ static struct file_operations bbswitch_fops = {
     .llseek = seq_lseek,
     .release= single_release
 };
+#endif
 
 static struct notifier_block nb = {
     .notifier_call = &bbswitch_pm_handler
@@ -418,12 +430,13 @@ static int __init bbswitch_init(void) {
 
         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buf);
 
-        if (pdev->vendor == PCI_VENDOR_ID_INTEL) {
+        if (pdev->vendor == PCI_VENDOR_ID_ATI) {
             igd_handle = handle;
             pr_info("Found integrated VGA device %s: %s\n",
                 dev_name(&pdev->dev), (char *)buf.pointer);
         } else {
             dis_dev = pdev;
+            pci_d3cold_enable(pdev);
             dis_handle = handle;
             pr_info("Found discrete VGA device %s: %s\n",
                 dev_name(&pdev->dev), (char *)buf.pointer);