drivers/message/i2o/bus-osm.c

   1 /*
   2  *      Bus Adapter OSM
   3  *
   4  *      Copyright (C) 2005      Markus Lidel <Markus.Lidel@shadowconnect.com>
   5  *
   6  *      This program is free software; you can redistribute it and/or modify it
   7  *      under the terms of the GNU General Public License as published by the
   8  *      Free Software Foundation; either version 2 of the License, or (at your
   9  *      option) any later version.
  10  *
  11  *      Fixes/additions:
  12  *              Markus Lidel <Markus.Lidel@shadowconnect.com>
  13  *                      initial version.
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/i2o.h>
  18
  19 #define OSM_NAME        "bus-osm"
  20 #define OSM_VERSION     "$Rev$"
  21 #define OSM_DESCRIPTION "I2O Bus Adapter OSM"
  22
  23 static struct i2o_driver i2o_bus_driver;
  24
  25 /* Bus OSM class handling definition */
  26 static struct i2o_class_id i2o_bus_class_id[] = {
  27         {I2O_CLASS_BUS_ADAPTER},
  28         {I2O_CLASS_END}
  29 };
  30
  31 /**
  32  *      i2o_bus_scan - Scan the bus for new devices
  33  *      @dev: I2O device of the bus, which should be scanned
  34  *
  35  *      Scans the bus dev for new / removed devices. After the scan a new LCT
  36  *      will be fetched automatically.
  37  *
  38  *      Returns 0 on success or negative error code on failure.
  39  */
  40 static int i2o_bus_scan(struct i2o_device *dev)
  41 {
  42         struct i2o_message __iomem *msg;
  43         u32 m;
  44
  45         m = i2o_msg_get_wait(dev->iop, &msg, I2O_TIMEOUT_MESSAGE_GET);
  46         if (m == I2O_QUEUE_EMPTY)
  47                 return -ETIMEDOUT;
  48
  49         writel(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]);
  50         writel(I2O_CMD_BUS_SCAN << 24 | HOST_TID << 12 | dev->lct_data.tid,
  51                &msg->u.head[1]);
  52
  53         return i2o_msg_post_wait(dev->iop, m, 60);
  54 };
  55
  56 /**
  57  *      i2o_bus_store_scan - Scan the I2O Bus Adapter
  58  *      @d: device which should be scanned
  59  *
  60  *      Returns count.
  61  */
  62 static ssize_t i2o_bus_store_scan(struct device *d, struct device_attribute *attr, const char *buf,
  63                                   size_t count)
  64 {
  65         struct i2o_device *i2o_dev = to_i2o_device(d);
  66         int rc;
  67
  68         if ((rc = i2o_bus_scan(i2o_dev)))
  69                 osm_warn("bus scan failed %d\n", rc);
  70
  71         return count;
  72 }
  73
  74 /* Bus Adapter OSM device attributes */
  75 static DEVICE_ATTR(scan, S_IWUSR, NULL, i2o_bus_store_scan);
  76
  77 /**
  78  *      i2o_bus_probe - verify if dev is a I2O Bus Adapter device and install it
  79  *      @dev: device to verify if it is a I2O Bus Adapter device
  80  *
  81  *      Because we want all Bus Adapters always return 0.
  82  *
  83  *      Returns 0.
  84  */
  85 static int i2o_bus_probe(struct device *dev)
  86 {
  87         struct i2o_device *i2o_dev = to_i2o_device(get_device(dev));
  88
  89         device_create_file(dev, &dev_attr_scan);
  90
  91         osm_info("device added (TID: %03x)\n", i2o_dev->lct_data.tid);
  92
  93         return 0;
  94 };
  95
  96 /**
  97  *      i2o_bus_remove - remove the I2O Bus Adapter device from the system again
  98  *      @dev: I2O Bus Adapter device which should be removed
  99  *
 100  *      Always returns 0.
 101  */
 102 static int i2o_bus_remove(struct device *dev)
 103 {
 104         struct i2o_device *i2o_dev = to_i2o_device(dev);
 105
 106         device_remove_file(dev, &dev_attr_scan);
 107
 108         put_device(dev);
 109
 110         osm_info("device removed (TID: %03x)\n", i2o_dev->lct_data.tid);
 111
 112         return 0;
 113 };
 114
 115 /* Bus Adapter OSM driver struct */
 116 static struct i2o_driver i2o_bus_driver = {
 117         .name = OSM_NAME,
 118         .classes = i2o_bus_class_id,
 119         .driver = {
 120                    .probe = i2o_bus_probe,
 121                    .remove = i2o_bus_remove,
 122                    },
 123 };
 124
 125 /**
 126  *      i2o_bus_init - Bus Adapter OSM initialization function
 127  *
 128  *      Only register the Bus Adapter OSM in the I2O core.
 129  *
 130  *      Returns 0 on success or negative error code on failure.
 131  */
 132 static int __init i2o_bus_init(void)
 133 {
 134         int rc;
 135
 136         printk(KERN_INFO OSM_DESCRIPTION " v" OSM_VERSION "\n");
 137
 138         /* Register Bus Adapter OSM into I2O core */
 139         rc = i2o_driver_register(&i2o_bus_driver);
 140         if (rc) {
 141                 osm_err("Could not register Bus Adapter OSM\n");
 142                 return rc;
 143         }
 144
 145         return 0;
 146 };
 147
 148 /**
 149  *      i2o_bus_exit - Bus Adapter OSM exit function
 150  *
 151  *      Unregisters Bus Adapter OSM from I2O core.
 152  */
 153 static void __exit i2o_bus_exit(void)
 154 {
 155         i2o_driver_unregister(&i2o_bus_driver);
 156 };
 157
 158 MODULE_AUTHOR("Markus Lidel <Markus.Lidel@shadowconnect.com>");
 159 MODULE_LICENSE("GPL");
 160 MODULE_DESCRIPTION(OSM_DESCRIPTION);
 161 MODULE_VERSION(OSM_VERSION);
 162
 163 module_init(i2o_bus_init);
 164 module_exit(i2o_bus_exit);