blob: cdd6c8efc9f8ccadef82a989f2269ffd17f01151 [file] [log] [blame]
David Vrabelda389ea2008-09-17 16:34:12 +01001/*
2 * Bus for UWB Multi-interface Controller capabilities.
3 *
4 * Copyright (C) 2007 Cambridge Silicon Radio Ltd.
5 *
6 * This file is released under the GNU GPL v2.
7 */
8#include <linux/kernel.h>
9#include <linux/sysfs.h>
10#include <linux/workqueue.h>
11#include <linux/uwb/umc.h>
12#include <linux/pci.h>
13
David Vrabel307ba6d2008-11-07 17:37:33 +000014static int umc_bus_pre_reset_helper(struct device *dev, void *data)
David Vrabelda389ea2008-09-17 16:34:12 +010015{
David Vrabel307ba6d2008-11-07 17:37:33 +000016 int ret = 0;
David Vrabelda389ea2008-09-17 16:34:12 +010017
David Vrabel307ba6d2008-11-07 17:37:33 +000018 if (dev->driver) {
19 struct umc_dev *umc = to_umc_dev(dev);
20 struct umc_driver *umc_drv = to_umc_driver(dev->driver);
21
22 if (umc_drv->pre_reset)
23 ret = umc_drv->pre_reset(umc);
24 else
25 device_release_driver(dev);
26 }
27 return ret;
28}
29
30static int umc_bus_post_reset_helper(struct device *dev, void *data)
31{
32 int ret = 0;
33
34 if (dev->driver) {
35 struct umc_dev *umc = to_umc_dev(dev);
36 struct umc_driver *umc_drv = to_umc_driver(dev->driver);
37
38 if (umc_drv->post_reset)
39 ret = umc_drv->post_reset(umc);
40 } else
41 ret = device_attach(dev);
42
43 return ret;
David Vrabelda389ea2008-09-17 16:34:12 +010044}
45
46/**
47 * umc_controller_reset - reset the whole UMC controller
48 * @umc: the UMC device for the radio controller.
49 *
David Vrabel307ba6d2008-11-07 17:37:33 +000050 * Drivers or all capabilities of the controller will have their
51 * pre_reset methods called or be unbound from their device. Then all
52 * post_reset methods will be called or the drivers will be rebound.
53 *
54 * Radio controllers must provide pre_reset and post_reset methods and
55 * reset the hardware in their start method.
David Vrabelda389ea2008-09-17 16:34:12 +010056 *
57 * If this is called while a probe() or remove() is in progress it
58 * will return -EAGAIN and not perform the reset.
59 */
60int umc_controller_reset(struct umc_dev *umc)
61{
62 struct device *parent = umc->dev.parent;
David Vrabel307ba6d2008-11-07 17:37:33 +000063 int ret = 0;
David Vrabelda389ea2008-09-17 16:34:12 +010064
David Vrabel307ba6d2008-11-07 17:37:33 +000065 if(down_trylock(&parent->sem))
David Vrabelda389ea2008-09-17 16:34:12 +010066 return -EAGAIN;
David Vrabel307ba6d2008-11-07 17:37:33 +000067 ret = device_for_each_child(parent, parent, umc_bus_pre_reset_helper);
68 if (ret >= 0)
David Vrabel0396c212009-08-25 16:41:06 +010069 ret = device_for_each_child(parent, parent, umc_bus_post_reset_helper);
David Vrabelda389ea2008-09-17 16:34:12 +010070 up(&parent->sem);
71
72 return ret;
73}
74EXPORT_SYMBOL_GPL(umc_controller_reset);
75
76/**
77 * umc_match_pci_id - match a UMC driver to a UMC device's parent PCI device.
78 * @umc_drv: umc driver with match_data pointing to a zero-terminated
79 * table of pci_device_id's.
80 * @umc: umc device whose parent is to be matched.
81 */
82int umc_match_pci_id(struct umc_driver *umc_drv, struct umc_dev *umc)
83{
84 const struct pci_device_id *id_table = umc_drv->match_data;
85 struct pci_dev *pci;
86
87 if (umc->dev.parent->bus != &pci_bus_type)
88 return 0;
89
90 pci = to_pci_dev(umc->dev.parent);
91 return pci_match_id(id_table, pci) != NULL;
92}
93EXPORT_SYMBOL_GPL(umc_match_pci_id);
94
95static int umc_bus_rescan_helper(struct device *dev, void *data)
96{
97 int ret = 0;
98
99 if (!dev->driver)
100 ret = device_attach(dev);
101
David Vrabel307ba6d2008-11-07 17:37:33 +0000102 return ret;
David Vrabelda389ea2008-09-17 16:34:12 +0100103}
104
David Vrabel307ba6d2008-11-07 17:37:33 +0000105static void umc_bus_rescan(struct device *parent)
David Vrabelda389ea2008-09-17 16:34:12 +0100106{
107 int err;
108
109 /*
110 * We can't use bus_rescan_devices() here as it deadlocks when
111 * it tries to retake the dev->parent semaphore.
112 */
David Vrabel307ba6d2008-11-07 17:37:33 +0000113 err = device_for_each_child(parent, NULL, umc_bus_rescan_helper);
David Vrabelda389ea2008-09-17 16:34:12 +0100114 if (err < 0)
115 printk(KERN_WARNING "%s: rescan of bus failed: %d\n",
116 KBUILD_MODNAME, err);
117}
118
119static int umc_bus_match(struct device *dev, struct device_driver *drv)
120{
121 struct umc_dev *umc = to_umc_dev(dev);
122 struct umc_driver *umc_driver = to_umc_driver(drv);
123
124 if (umc->cap_id == umc_driver->cap_id) {
125 if (umc_driver->match)
126 return umc_driver->match(umc_driver, umc);
127 else
128 return 1;
129 }
130 return 0;
131}
132
133static int umc_device_probe(struct device *dev)
134{
135 struct umc_dev *umc;
136 struct umc_driver *umc_driver;
137 int err;
138
139 umc_driver = to_umc_driver(dev->driver);
140 umc = to_umc_dev(dev);
141
142 get_device(dev);
143 err = umc_driver->probe(umc);
144 if (err)
145 put_device(dev);
146 else
David Vrabel307ba6d2008-11-07 17:37:33 +0000147 umc_bus_rescan(dev->parent);
David Vrabelda389ea2008-09-17 16:34:12 +0100148
149 return err;
150}
151
152static int umc_device_remove(struct device *dev)
153{
154 struct umc_dev *umc;
155 struct umc_driver *umc_driver;
156
157 umc_driver = to_umc_driver(dev->driver);
158 umc = to_umc_dev(dev);
159
160 umc_driver->remove(umc);
161 put_device(dev);
162 return 0;
163}
164
165static int umc_device_suspend(struct device *dev, pm_message_t state)
166{
167 struct umc_dev *umc;
168 struct umc_driver *umc_driver;
169 int err = 0;
170
171 umc = to_umc_dev(dev);
172
173 if (dev->driver) {
174 umc_driver = to_umc_driver(dev->driver);
175 if (umc_driver->suspend)
176 err = umc_driver->suspend(umc, state);
177 }
178 return err;
179}
180
181static int umc_device_resume(struct device *dev)
182{
183 struct umc_dev *umc;
184 struct umc_driver *umc_driver;
185 int err = 0;
186
187 umc = to_umc_dev(dev);
188
189 if (dev->driver) {
190 umc_driver = to_umc_driver(dev->driver);
191 if (umc_driver->resume)
192 err = umc_driver->resume(umc);
193 }
194 return err;
195}
196
197static ssize_t capability_id_show(struct device *dev, struct device_attribute *attr, char *buf)
198{
199 struct umc_dev *umc = to_umc_dev(dev);
200
201 return sprintf(buf, "0x%02x\n", umc->cap_id);
202}
203
204static ssize_t version_show(struct device *dev, struct device_attribute *attr, char *buf)
205{
206 struct umc_dev *umc = to_umc_dev(dev);
207
208 return sprintf(buf, "0x%04x\n", umc->version);
209}
210
211static struct device_attribute umc_dev_attrs[] = {
212 __ATTR_RO(capability_id),
213 __ATTR_RO(version),
214 __ATTR_NULL,
215};
216
217struct bus_type umc_bus_type = {
218 .name = "umc",
219 .match = umc_bus_match,
220 .probe = umc_device_probe,
221 .remove = umc_device_remove,
222 .suspend = umc_device_suspend,
223 .resume = umc_device_resume,
224 .dev_attrs = umc_dev_attrs,
225};
226EXPORT_SYMBOL_GPL(umc_bus_type);
227
228static int __init umc_bus_init(void)
229{
230 return bus_register(&umc_bus_type);
231}
232module_init(umc_bus_init);
233
234static void __exit umc_bus_exit(void)
235{
236 bus_unregister(&umc_bus_type);
237}
238module_exit(umc_bus_exit);
239
240MODULE_DESCRIPTION("UWB Multi-interface Controller capability bus");
241MODULE_AUTHOR("Cambridge Silicon Radio Ltd.");
242MODULE_LICENSE("GPL");