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22#include <linux/device.h>
23#include <linux/module.h>
24#include <linux/pci.h>
25#include <linux/slab.h>
26#include <linux/uio_driver.h>
27
28#define DRIVER_VERSION "0.01.0"
29#define DRIVER_AUTHOR "Michael S. Tsirkin <mst@redhat.com>"
30#define DRIVER_DESC "Generic UIO driver for PCI 2.3 devices"
31
32struct uio_pci_generic_dev {
33 struct uio_info info;
34 struct pci_dev *pdev;
35};
36
37static inline struct uio_pci_generic_dev *
38to_uio_pci_generic_dev(struct uio_info *info)
39{
40 return container_of(info, struct uio_pci_generic_dev, info);
41}
42
43
44
45static irqreturn_t irqhandler(int irq, struct uio_info *info)
46{
47 struct uio_pci_generic_dev *gdev = to_uio_pci_generic_dev(info);
48
49 if (!pci_check_and_mask_intx(gdev->pdev))
50 return IRQ_NONE;
51
52
53 return IRQ_HANDLED;
54}
55
56static int probe(struct pci_dev *pdev,
57 const struct pci_device_id *id)
58{
59 struct uio_pci_generic_dev *gdev;
60 int err;
61
62 err = pci_enable_device(pdev);
63 if (err) {
64 dev_err(&pdev->dev, "%s: pci_enable_device failed: %d\n",
65 __func__, err);
66 return err;
67 }
68
69 if (pdev->irq && !pci_intx_mask_supported(pdev)) {
70 err = -ENODEV;
71 goto err_verify;
72 }
73
74 gdev = kzalloc(sizeof(struct uio_pci_generic_dev), GFP_KERNEL);
75 if (!gdev) {
76 err = -ENOMEM;
77 goto err_alloc;
78 }
79
80 gdev->info.name = "uio_pci_generic";
81 gdev->info.version = DRIVER_VERSION;
82 gdev->pdev = pdev;
83 if (pdev->irq) {
84 gdev->info.irq = pdev->irq;
85 gdev->info.irq_flags = IRQF_SHARED;
86 gdev->info.handler = irqhandler;
87 } else {
88 dev_warn(&pdev->dev, "No IRQ assigned to device: "
89 "no support for interrupts?\n");
90 }
91
92 err = uio_register_device(&pdev->dev, &gdev->info);
93 if (err)
94 goto err_register;
95 pci_set_drvdata(pdev, gdev);
96
97 return 0;
98err_register:
99 kfree(gdev);
100err_alloc:
101err_verify:
102 pci_disable_device(pdev);
103 return err;
104}
105
106static void remove(struct pci_dev *pdev)
107{
108 struct uio_pci_generic_dev *gdev = pci_get_drvdata(pdev);
109
110 uio_unregister_device(&gdev->info);
111 pci_disable_device(pdev);
112 kfree(gdev);
113}
114
115static struct pci_driver uio_pci_driver = {
116 .name = "uio_pci_generic",
117 .id_table = NULL,
118 .probe = probe,
119 .remove = remove,
120};
121
122module_pci_driver(uio_pci_driver);
123MODULE_VERSION(DRIVER_VERSION);
124MODULE_LICENSE("GPL v2");
125MODULE_AUTHOR(DRIVER_AUTHOR);
126MODULE_DESCRIPTION(DRIVER_DESC);
127