release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/spi/xilinx_spi_pltfm.c

   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
  37 static 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
  68 static 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 */
  77 MODULE_ALIAS("platform:" XILINX_SPI_NAME);
  78
  79 static 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
  88 static int __init xilinx_spi_pltfm_init(void)
  89 {
  90         return platform_driver_register(&xilinx_spi_driver);
  91 }
  92 module_init(xilinx_spi_pltfm_init);
  93
  94 static void __exit xilinx_spi_pltfm_exit(void)
  95 {
  96         platform_driver_unregister(&xilinx_spi_driver);
  97 }
  98 module_exit(xilinx_spi_pltfm_exit);
  99
 100 MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
 101 MODULE_DESCRIPTION("Xilinx SPI platform driver");
 102 MODULE_LICENSE("GPL v2");