PCI example added

9 files changed, 242 insertions, 0 deletions

diff --git a/kernel-devel/module-basics/vain_pci/Makefile b/kernel-devel/module-basics/vain_pci/Makefile
new file mode 100644
index 0000000..3c10921
--- /dev/null
+++ b/kernel-devel/module-basics/vain_pci/Makefile
@@ -0,0 +1,13 @@
+# If KERNELRELEASE is defined, we've been invoked from the
+# kernel build system and can use its language.
+ifneq ($(KERNELRELEASE),)
+    obj-m := vain_pci.o
+
+# Otherwise we were called directly from the command
+# line; invoke the kernel build system.
+else
+    KERNELDIR ?= /lib/modules/$(shell uname -r)/build
+    PWD := $(shell pwd)
+default:
+	$(MAKE) -C $(KERNELDIR) M=$(PWD) modules
+endif
\ No newline at end of file
diff --git a/kernel-devel/module-basics/vain_pci/vain_pci.c b/kernel-devel/module-basics/vain_pci/vain_pci.c
new file mode 100644
index 0000000..ff95d0d
--- /dev/null
+++ b/kernel-devel/module-basics/vain_pci/vain_pci.c
@@ -0,0 +1,6 @@
+#include "vain_pci_1.c"
+#include "vain_pci_2.c"
+#include "vain_pci_3.c"
+#include "vain_pci_4.c"
+#include "vain_pci_5.c"
+#include "vain_pci_6.c"
diff --git a/kernel-devel/module-basics/vain_pci/vain_pci_1.c b/kernel-devel/module-basics/vain_pci/vain_pci_1.c
new file mode 100644
index 0000000..d60b230
--- /dev/null
+++ b/kernel-devel/module-basics/vain_pci/vain_pci_1.c
@@ -0,0 +1,19 @@
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+
+#define PCI_VENDOR_ID_ILLEGAL_VENDOR 0xffff
+#define PCI_DEVICE_ID_ILLEGAL_VENDOR_DEVICE 0x2342
+
+struct vain_pci_info {
+	void __iomem *base;
+	struct pci_dev *pdev;
+	spinlock_t lock;
+};
+
+static struct pci_device_id vain_pci_ids[] __devinitdata = {
+	{PCI_VENDOR_ID_ILLEGAL_VENDOR, PCI_DEVICE_ID_ILLEGAL_VENDOR_DEVICE,
+	 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
+	{0, }
+};
+MODULE_DEVICE_TABLE(pci, vain_pci_ids);
diff --git a/kernel-devel/module-basics/vain_pci/vain_pci_2.c b/kernel-devel/module-basics/vain_pci/vain_pci_2.c
new file mode 100644
index 0000000..cc4118d
--- /dev/null
+++ b/kernel-devel/module-basics/vain_pci/vain_pci_2.c
@@ -0,0 +1,22 @@
+static int __devinit vain_pci_probe(struct pci_dev *pdev,
+				    const struct pci_device_id *ent)
+{
+	struct vain_pci_info *info;
+	int ret;
+
+	dev_dbg(&pdev->dev, "Init, new card found\n");
+
+	info = kzalloc(sizeof(struct vain_pci_info), GFP_KERNEL);
+	if (unlikely(!info)) {
+		dev_err(&pdev->dev, "Could not allocate memory\n");
+		ret = -ENOMEM;
+		goto err_free;
+	}
+
+	info->pdev = pdev;
+
+	ret = pci_enable_device(pdev);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to enable PCI Device\n");
+		goto err_free;
+	}
diff --git a/kernel-devel/module-basics/vain_pci/vain_pci_3.c b/kernel-devel/module-basics/vain_pci/vain_pci_3.c
new file mode 100644
index 0000000..77bee68
--- /dev/null
+++ b/kernel-devel/module-basics/vain_pci/vain_pci_3.c
@@ -0,0 +1,17 @@
+	ret = pci_request_regions(pdev, "vain_pci");
+	if (ret) {
+		dev_err(&pdev->dev, "I/O address 0x%04x already in use\n",
+			(int) /* nozomi_private.io_addr */ 0);
+		goto err_disable_device;
+	}
+
+	info->base = pci_ioremap_bar(pdev, 0);
+	if (!info->base) {
+		dev_err(&pdev->dev, "Unable to map card MMIO\n");
+		ret = -ENODEV;
+		goto err_rel_regs;
+	}
+
+	pci_set_drvdata(pdev, info);
+
+	return 0;
diff --git a/kernel-devel/module-basics/vain_pci/vain_pci_4.c b/kernel-devel/module-basics/vain_pci/vain_pci_4.c
new file mode 100644
index 0000000..f238f22
--- /dev/null
+++ b/kernel-devel/module-basics/vain_pci/vain_pci_4.c
@@ -0,0 +1,21 @@
+err_rel_regs:
+	pci_release_regions(pdev);
+err_disable_device:
+	pci_disable_device(pdev);
+err_free:
+	kfree(info);
+
+	return ret;
+}
+
+static void __devexit vain_pci_remove(struct pci_dev *pdev)
+{
+	struct vain_pci_info *info = pci_get_drvdata(pdev);
+
+	iounmap(info->base);
+	pci_release_regions(pdev);
+	pci_disable_device(pdev);
+	pci_set_drvdata(pdev, NULL);
+
+	kfree (info);
+}
diff --git a/kernel-devel/module-basics/vain_pci/vain_pci_5.c b/kernel-devel/module-basics/vain_pci/vain_pci_5.c
new file mode 100644
index 0000000..6bdc314
--- /dev/null
+++ b/kernel-devel/module-basics/vain_pci/vain_pci_5.c
@@ -0,0 +1,23 @@
+static struct pci_driver vain_pci_driver = {
+	.name =		"vain_pci",
+	.id_table =	vain_pci_ids,
+	.probe =	vain_pci_probe,
+	.remove =	__devexit_p(vain_pci_remove),
+};
+
+static int vain_pci_init(void)
+{
+	int err;
+
+	err = pci_register_driver(&vain_pci_driver);
+
+	if (!err)
+		printk(KERN_INFO "vain_pci_init: done\n");
+	return err;
+}
+
+static void vain_pci_exit(void)
+{
+	pci_unregister_driver(&vain_pci_driver);
+	printk(KERN_INFO "vain_pci_exit: done\n");
+}
diff --git a/kernel-devel/module-basics/vain_pci/vain_pci_6.c b/kernel-devel/module-basics/vain_pci/vain_pci_6.c
new file mode 100644
index 0000000..d672a25
--- /dev/null
+++ b/kernel-devel/module-basics/vain_pci/vain_pci_6.c
@@ -0,0 +1,7 @@
+module_init(vain_pci_init);
+module_exit(vain_pci_exit);
+
+MODULE_AUTHOR("Benedikt Spranger <b.spranger@linutronix.de>");
+MODULE_DESCRIPTION("a more or less useless PCI module");
+MODULE_LICENSE("GPL v2");
+MODULE_VERSION("0815");
diff --git a/kernel-devel/module-basics/vain_pci/vain_pci_orig.c b/kernel-devel/module-basics/vain_pci/vain_pci_orig.c
new file mode 100644
index 0000000..d84a54e
--- /dev/null
+++ b/kernel-devel/module-basics/vain_pci/vain_pci_orig.c
@@ -0,0 +1,114 @@
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+
+#define PCI_VENDOR_ID_ILLEGAL_VENDOR 0xffff
+#define PCI_DEVICE_ID_ILLEGAL_VENDOR_DEVICE 0x2342
+
+struct vain_pci_info {
+	void __iomem *base;
+	struct pci_dev *pdev;
+	spinlock_t lock;
+};
+
+static struct pci_device_id vain_pci_ids[] __devinitdata = {
+	{PCI_VENDOR_ID_ILLEGAL_VENDOR, PCI_DEVICE_ID_ILLEGAL_VENDOR_DEVICE,
+	 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
+	{0, }
+};
+MODULE_DEVICE_TABLE(pci, vain_pci_ids);
+
+static int __devinit vain_pci_probe(struct pci_dev *pdev,
+				    const struct pci_device_id *ent)
+{
+	struct vain_pci_info *info;
+	int ret;
+
+	dev_dbg(&pdev->dev, "Init, new card found\n");
+
+	info = kzalloc(sizeof(struct vain_pci_info), GFP_KERNEL);
+	if (unlikely(!info)) {
+		dev_err(&pdev->dev, "Could not allocate memory\n");
+		ret = -ENOMEM;
+		goto err_free;
+	}
+
+	info->pdev = pdev;
+
+	ret = pci_enable_device(pdev);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to enable PCI Device\n");
+		goto err_free;
+	}
+
+	ret = pci_request_regions(pdev, "vain_pci");
+	if (ret) {
+		dev_err(&pdev->dev, "I/O address 0x%04x already in use\n",
+			(int) /* nozomi_private.io_addr */ 0);
+		goto err_disable_device;
+	}
+
+	info->base = pci_ioremap_bar(pdev, 0);
+	if (!info->base) {
+		dev_err(&pdev->dev, "Unable to map card MMIO\n");
+		ret = -ENODEV;
+		goto err_rel_regs;
+	}
+
+	pci_set_drvdata(pdev, info);
+
+	return 0;
+
+err_rel_regs:
+	pci_release_regions(pdev);
+err_disable_device:
+	pci_disable_device(pdev);
+err_free:
+	kfree(info);
+
+	return ret;
+}
+
+static void __devexit vain_pci_remove(struct pci_dev *pdev)
+{
+	struct vain_pci_info *info = pci_get_drvdata(pdev);
+
+	iounmap(info->base);
+	pci_release_regions(pdev);
+	pci_disable_device(pdev);
+	pci_set_drvdata(pdev, NULL);
+
+	kfree (info);
+}
+
+static struct pci_driver vain_pci_driver = {
+	.name =		"vain_pci",
+	.id_table =	vain_pci_ids,
+	.probe =	vain_pci_probe,
+	.remove =	__devexit_p(vain_pci_remove),
+};
+
+static int vain_pci_init(void)
+{
+	int err;
+
+	err = pci_register_driver(&vain_pci_driver);
+
+	if (!err)
+		printk(KERN_INFO "vain_pci_init: done\n");
+	return err;
+}
+
+static void vain_pci_exit(void)
+{
+	pci_unregister_driver(&vain_pci_driver);
+	printk(KERN_INFO "vain_pci_exit: done\n");
+}
+
+module_init(vain_pci_init);
+module_exit(vain_pci_exit);
+
+MODULE_AUTHOR("Benedikt Spranger <b.spranger@linutronix.de>");
+MODULE_DESCRIPTION("a more or less useless PCI module");
+MODULE_LICENSE("GPL v2");
+MODULE_VERSION("0815");