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     "1.317"
  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 *msg;
  43
  44         msg = i2o_msg_get_wait(dev->iop, I2O_TIMEOUT_MESSAGE_GET);
  45         if (IS_ERR(msg))
  46                 return -ETIMEDOUT;
  47
  48         msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0);
  49         msg->u.head[1] =
  50             cpu_to_le32(I2O_CMD_BUS_SCAN << 24 | HOST_TID << 12 | dev->lct_data.
  51                         tid);
  52
  53         return i2o_msg_post_wait(dev->iop, msg, 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,
  63                                   struct device_attribute *attr,
  64                                   const char *buf, size_t count)
  65 {
  66         struct i2o_device *i2o_dev = to_i2o_device(d);
  67         int rc;
  68
  69         if ((rc = i2o_bus_scan(i2o_dev)))
  70                 osm_warn("bus scan failed %d\n", rc);
  71
  72         return count;
  73 }
  74
  75 /* Bus Adapter OSM device attributes */
  76 static DEVICE_ATTR(scan, S_IWUSR, NULL, i2o_bus_store_scan);
  77
  78 /**
  79  *      i2o_bus_probe - verify if dev is a I2O Bus Adapter device and install it
  80  *      @dev: device to verify if it is a I2O Bus Adapter device
  81  *
  82  *      Because we want all Bus Adapters always return 0.
  83  *      Except when we fail.  Then we are sad.
  84  *
  85  *      Returns 0, except when we fail to excel.
  86  */
  87 static int i2o_bus_probe(struct device *dev)
  88 {
  89         struct i2o_device *i2o_dev = to_i2o_device(get_device(dev));
  90         int rc;
  91
  92         rc = device_create_file(dev, &dev_attr_scan);
  93         if (rc)
  94                 goto err_out;
  95
  96         osm_info("device added (TID: %03x)\n", i2o_dev->lct_data.tid);
  97
  98         return 0;
  99
 100 err_out:
 101         put_device(dev);
 102         return rc;
 103 };
 104
 105 /**
 106  *      i2o_bus_remove - remove the I2O Bus Adapter device from the system again
 107  *      @dev: I2O Bus Adapter device which should be removed
 108  *
 109  *      Always returns 0.
 110  */
 111 static int i2o_bus_remove(struct device *dev)
 112 {
 113         struct i2o_device *i2o_dev = to_i2o_device(dev);
 114
 115         device_remove_file(dev, &dev_attr_scan);
 116
 117         put_device(dev);
 118
 119         osm_info("device removed (TID: %03x)\n", i2o_dev->lct_data.tid);
 120
 121         return 0;
 122 };
 123
 124 /* Bus Adapter OSM driver struct */
 125 static struct i2o_driver i2o_bus_driver = {
 126         .name = OSM_NAME,
 127         .classes = i2o_bus_class_id,
 128         .driver = {
 129                    .probe = i2o_bus_probe,
 130                    .remove = i2o_bus_remove,
 131                    },
 132 };
 133
 134 /**
 135  *      i2o_bus_init - Bus Adapter OSM initialization function
 136  *
 137  *      Only register the Bus Adapter OSM in the I2O core.
 138  *
 139  *      Returns 0 on success or negative error code on failure.
 140  */
 141 static int __init i2o_bus_init(void)
 142 {
 143         int rc;
 144
 145         printk(KERN_INFO OSM_DESCRIPTION " v" OSM_VERSION "\n");
 146
 147         /* Register Bus Adapter OSM into I2O core */
 148         rc = i2o_driver_register(&i2o_bus_driver);
 149         if (rc) {
 150                 osm_err("Could not register Bus Adapter OSM\n");
 151                 return rc;
 152         }
 153
 154         return 0;
 155 };
 156
 157 /**
 158  *      i2o_bus_exit - Bus Adapter OSM exit function
 159  *
 160  *      Unregisters Bus Adapter OSM from I2O core.
 161  */
 162 static void __exit i2o_bus_exit(void)
 163 {
 164         i2o_driver_unregister(&i2o_bus_driver);
 165 };
 166
 167 MODULE_AUTHOR("Markus Lidel <Markus.Lidel@shadowconnect.com>");
 168 MODULE_LICENSE("GPL");
 169 MODULE_DESCRIPTION(OSM_DESCRIPTION);
 170 MODULE_VERSION(OSM_VERSION);
 171
 172 module_init(i2o_bus_init);
 173 module_exit(i2o_bus_exit);