1 /*
2 * comedi_pci.c
3 * Comedi PCI driver specific functions.
4 *
5 * COMEDI - Linux Control and Measurement Device Interface
6 * Copyright (C) 1997-2000 David A. Schleef <ds@schleef.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 */
18
19 #include <linux/pci.h>
20 #include <linux/interrupt.h>
21
22 #include "comedidev.h"
23
24 /**
25 * comedi_to_pci_dev() - comedi_device pointer to pci_dev pointer.
26 * @dev: comedi_device struct
27 */
comedi_to_pci_dev(struct comedi_device * dev)28 struct pci_dev *comedi_to_pci_dev(struct comedi_device *dev)
29 {
30 return dev->hw_dev ? to_pci_dev(dev->hw_dev) : NULL;
31 }
32 EXPORT_SYMBOL_GPL(comedi_to_pci_dev);
33
34 /**
35 * comedi_pci_enable() - Enable the PCI device and request the regions.
36 * @dev: comedi_device struct
37 */
comedi_pci_enable(struct comedi_device * dev)38 int comedi_pci_enable(struct comedi_device *dev)
39 {
40 struct pci_dev *pcidev = comedi_to_pci_dev(dev);
41 int rc;
42
43 if (!pcidev)
44 return -ENODEV;
45
46 rc = pci_enable_device(pcidev);
47 if (rc < 0)
48 return rc;
49
50 rc = pci_request_regions(pcidev, dev->board_name);
51 if (rc < 0)
52 pci_disable_device(pcidev);
53 else
54 dev->ioenabled = true;
55
56 return rc;
57 }
58 EXPORT_SYMBOL_GPL(comedi_pci_enable);
59
60 /**
61 * comedi_pci_disable() - Release the regions and disable the PCI device.
62 * @dev: comedi_device struct
63 */
comedi_pci_disable(struct comedi_device * dev)64 void comedi_pci_disable(struct comedi_device *dev)
65 {
66 struct pci_dev *pcidev = comedi_to_pci_dev(dev);
67
68 if (pcidev && dev->ioenabled) {
69 pci_release_regions(pcidev);
70 pci_disable_device(pcidev);
71 }
72 dev->ioenabled = false;
73 }
74 EXPORT_SYMBOL_GPL(comedi_pci_disable);
75
76 /**
77 * comedi_pci_detach() - A generic (*detach) function for PCI drivers.
78 * @dev: comedi_device struct
79 */
comedi_pci_detach(struct comedi_device * dev)80 void comedi_pci_detach(struct comedi_device *dev)
81 {
82 struct pci_dev *pcidev = comedi_to_pci_dev(dev);
83
84 if (!pcidev || !dev->ioenabled)
85 return;
86
87 if (dev->irq) {
88 free_irq(dev->irq, dev);
89 dev->irq = 0;
90 }
91 if (dev->mmio) {
92 iounmap(dev->mmio);
93 dev->mmio = NULL;
94 }
95 comedi_pci_disable(dev);
96 }
97 EXPORT_SYMBOL_GPL(comedi_pci_detach);
98
99 /**
100 * comedi_pci_auto_config() - Configure/probe a comedi PCI driver.
101 * @pcidev: pci_dev struct
102 * @driver: comedi_driver struct
103 * @context: driver specific data, passed to comedi_auto_config()
104 *
105 * Typically called from the pci_driver (*probe) function.
106 */
comedi_pci_auto_config(struct pci_dev * pcidev,struct comedi_driver * driver,unsigned long context)107 int comedi_pci_auto_config(struct pci_dev *pcidev,
108 struct comedi_driver *driver,
109 unsigned long context)
110 {
111 return comedi_auto_config(&pcidev->dev, driver, context);
112 }
113 EXPORT_SYMBOL_GPL(comedi_pci_auto_config);
114
115 /**
116 * comedi_pci_auto_unconfig() - Unconfigure/remove a comedi PCI driver.
117 * @pcidev: pci_dev struct
118 *
119 * Typically called from the pci_driver (*remove) function.
120 */
comedi_pci_auto_unconfig(struct pci_dev * pcidev)121 void comedi_pci_auto_unconfig(struct pci_dev *pcidev)
122 {
123 comedi_auto_unconfig(&pcidev->dev);
124 }
125 EXPORT_SYMBOL_GPL(comedi_pci_auto_unconfig);
126
127 /**
128 * comedi_pci_driver_register() - Register a comedi PCI driver.
129 * @comedi_driver: comedi_driver struct
130 * @pci_driver: pci_driver struct
131 *
132 * This function is used for the module_init() of comedi PCI drivers.
133 * Do not call it directly, use the module_comedi_pci_driver() helper
134 * macro instead.
135 */
comedi_pci_driver_register(struct comedi_driver * comedi_driver,struct pci_driver * pci_driver)136 int comedi_pci_driver_register(struct comedi_driver *comedi_driver,
137 struct pci_driver *pci_driver)
138 {
139 int ret;
140
141 ret = comedi_driver_register(comedi_driver);
142 if (ret < 0)
143 return ret;
144
145 ret = pci_register_driver(pci_driver);
146 if (ret < 0) {
147 comedi_driver_unregister(comedi_driver);
148 return ret;
149 }
150
151 return 0;
152 }
153 EXPORT_SYMBOL_GPL(comedi_pci_driver_register);
154
155 /**
156 * comedi_pci_driver_unregister() - Unregister a comedi PCI driver.
157 * @comedi_driver: comedi_driver struct
158 * @pci_driver: pci_driver struct
159 *
160 * This function is used for the module_exit() of comedi PCI drivers.
161 * Do not call it directly, use the module_comedi_pci_driver() helper
162 * macro instead.
163 */
comedi_pci_driver_unregister(struct comedi_driver * comedi_driver,struct pci_driver * pci_driver)164 void comedi_pci_driver_unregister(struct comedi_driver *comedi_driver,
165 struct pci_driver *pci_driver)
166 {
167 pci_unregister_driver(pci_driver);
168 comedi_driver_unregister(comedi_driver);
169 }
170 EXPORT_SYMBOL_GPL(comedi_pci_driver_unregister);
171