tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Support for Xilinx SPI platform devices
3 * Copyright (c) 2009 Intel Corporation
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17 */
18
19/* Supports:
20 * Xilinx SPI devices as platform devices
21 *
22 * Inspired by xilinx_spi.c, 2002-2007 (c) MontaVista Software, Inc.
23 */
24
25#include <linux/module.h>
26#include <linux/init.h>
27#include <linux/interrupt.h>
28#include <linux/io.h>
29#include <linux/platform_device.h>
30
31#include <linux/spi/spi.h>
32#include <linux/spi/spi_bitbang.h>
33#include <linux/spi/xilinx_spi.h>
34
35#include "xilinx_spi.h"
36
37static int __devinit xilinx_spi_probe(struct platform_device *dev)
38{
39 struct xspi_platform_data *pdata;
40 struct resource *r;
41 int irq;
42 struct spi_master *master;
43 u8 i;
44
45 pdata = dev->dev.platform_data;
46 if (!pdata)
47 return -ENODEV;
48
49 r = platform_get_resource(dev, IORESOURCE_MEM, 0);
50 if (!r)
51 return -ENODEV;
52
53 irq = platform_get_irq(dev, 0);
54 if (irq < 0)
55 return -ENXIO;
56
57 master = xilinx_spi_init(&dev->dev, r, irq, dev->id);
58 if (!master)
59 return -ENODEV;
60
61 for (i = 0; i < pdata->num_devices; i++)
62 spi_new_device(master, pdata->devices + i);
63
64 platform_set_drvdata(dev, master);
65 return 0;
66}
67
68static int __devexit xilinx_spi_remove(struct platform_device *dev)
69{
70 xilinx_spi_deinit(platform_get_drvdata(dev));
71 platform_set_drvdata(dev, 0);
72
73 return 0;
74}
75
76/* work with hotplug and coldplug */
77MODULE_ALIAS("platform:" XILINX_SPI_NAME);
78
79static struct platform_driver xilinx_spi_driver = {
80 .probe = xilinx_spi_probe,
81 .remove = __devexit_p(xilinx_spi_remove),
82 .driver = {
83 .name = XILINX_SPI_NAME,
84 .owner = THIS_MODULE,
85 },
86};
87
88static int __init xilinx_spi_pltfm_init(void)
89{
90 return platform_driver_register(&xilinx_spi_driver);
91}
92module_init(xilinx_spi_pltfm_init);
93
94static void __exit xilinx_spi_pltfm_exit(void)
95{
96 platform_driver_unregister(&xilinx_spi_driver);
97}
98module_exit(xilinx_spi_pltfm_exit);
99
100MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
101MODULE_DESCRIPTION("Xilinx SPI platform driver");
102MODULE_LICENSE("GPL v2");