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![Federico Vaga](/assets/img/avatar_default.png)
There was not any kind of protection against carrier driver removal. In this way, device driver can 'get' the carrier driver when it is using it. Signed-off-by: Federico Vaga <federico.vaga@cern.ch> Acked-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
507 lines
12 KiB
C
507 lines
12 KiB
C
/*
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* Industry-pack bus support functions.
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*
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* Copyright (C) 2011-2012 CERN (www.cern.ch)
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* Author: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; version 2 of the License.
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/idr.h>
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#include <linux/io.h>
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#include <linux/ipack.h>
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#define to_ipack_dev(device) container_of(device, struct ipack_device, dev)
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#define to_ipack_driver(drv) container_of(drv, struct ipack_driver, driver)
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static DEFINE_IDA(ipack_ida);
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static void ipack_device_release(struct device *dev)
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{
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struct ipack_device *device = to_ipack_dev(dev);
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kfree(device->id);
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device->release(device);
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}
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static inline const struct ipack_device_id *
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ipack_match_one_device(const struct ipack_device_id *id,
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const struct ipack_device *device)
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{
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if ((id->format == IPACK_ANY_FORMAT ||
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id->format == device->id_format) &&
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(id->vendor == IPACK_ANY_ID || id->vendor == device->id_vendor) &&
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(id->device == IPACK_ANY_ID || id->device == device->id_device))
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return id;
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return NULL;
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}
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static const struct ipack_device_id *
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ipack_match_id(const struct ipack_device_id *ids, struct ipack_device *idev)
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{
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if (ids) {
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while (ids->vendor || ids->device) {
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if (ipack_match_one_device(ids, idev))
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return ids;
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ids++;
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}
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}
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return NULL;
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}
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static int ipack_bus_match(struct device *dev, struct device_driver *drv)
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{
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struct ipack_device *idev = to_ipack_dev(dev);
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struct ipack_driver *idrv = to_ipack_driver(drv);
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const struct ipack_device_id *found_id;
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found_id = ipack_match_id(idrv->id_table, idev);
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return found_id ? 1 : 0;
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}
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static int ipack_bus_probe(struct device *device)
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{
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struct ipack_device *dev = to_ipack_dev(device);
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struct ipack_driver *drv = to_ipack_driver(device->driver);
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if (!drv->ops->probe)
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return -EINVAL;
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return drv->ops->probe(dev);
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}
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static int ipack_bus_remove(struct device *device)
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{
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struct ipack_device *dev = to_ipack_dev(device);
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struct ipack_driver *drv = to_ipack_driver(device->driver);
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if (!drv->ops->remove)
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return -EINVAL;
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drv->ops->remove(dev);
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return 0;
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}
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static int ipack_uevent(struct device *dev, struct kobj_uevent_env *env)
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{
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struct ipack_device *idev;
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if (!dev)
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return -ENODEV;
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idev = to_ipack_dev(dev);
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if (add_uevent_var(env,
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"MODALIAS=ipack:f%02Xv%08Xd%08X", idev->id_format,
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idev->id_vendor, idev->id_device))
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return -ENOMEM;
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return 0;
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}
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#define ipack_device_attr(field, format_string) \
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static ssize_t \
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field##_show(struct device *dev, struct device_attribute *attr, \
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char *buf) \
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{ \
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struct ipack_device *idev = to_ipack_dev(dev); \
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return sprintf(buf, format_string, idev->field); \
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}
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static ssize_t id_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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unsigned int i, c, l, s;
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struct ipack_device *idev = to_ipack_dev(dev);
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switch (idev->id_format) {
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case IPACK_ID_VERSION_1:
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l = 0x7; s = 1; break;
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case IPACK_ID_VERSION_2:
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l = 0xf; s = 2; break;
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default:
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return -EIO;
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}
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c = 0;
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for (i = 0; i < idev->id_avail; i++) {
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if (i > 0) {
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if ((i & l) == 0)
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buf[c++] = '\n';
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else if ((i & s) == 0)
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buf[c++] = ' ';
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}
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sprintf(&buf[c], "%02x", idev->id[i]);
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c += 2;
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}
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buf[c++] = '\n';
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return c;
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}
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static ssize_t
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id_vendor_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct ipack_device *idev = to_ipack_dev(dev);
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switch (idev->id_format) {
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case IPACK_ID_VERSION_1:
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return sprintf(buf, "0x%02x\n", idev->id_vendor);
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case IPACK_ID_VERSION_2:
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return sprintf(buf, "0x%06x\n", idev->id_vendor);
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default:
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return -EIO;
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}
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}
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static ssize_t
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id_device_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct ipack_device *idev = to_ipack_dev(dev);
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switch (idev->id_format) {
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case IPACK_ID_VERSION_1:
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return sprintf(buf, "0x%02x\n", idev->id_device);
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case IPACK_ID_VERSION_2:
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return sprintf(buf, "0x%04x\n", idev->id_device);
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default:
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return -EIO;
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}
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}
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static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct ipack_device *idev = to_ipack_dev(dev);
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return sprintf(buf, "ipac:f%02Xv%08Xd%08X", idev->id_format,
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idev->id_vendor, idev->id_device);
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}
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ipack_device_attr(id_format, "0x%hhu\n");
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static DEVICE_ATTR_RO(id);
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static DEVICE_ATTR_RO(id_device);
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static DEVICE_ATTR_RO(id_format);
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static DEVICE_ATTR_RO(id_vendor);
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static DEVICE_ATTR_RO(modalias);
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static struct attribute *ipack_attrs[] = {
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&dev_attr_id.attr,
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&dev_attr_id_device.attr,
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&dev_attr_id_format.attr,
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&dev_attr_id_vendor.attr,
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&dev_attr_modalias.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(ipack);
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static struct bus_type ipack_bus_type = {
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.name = "ipack",
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.probe = ipack_bus_probe,
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.match = ipack_bus_match,
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.remove = ipack_bus_remove,
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.dev_groups = ipack_groups,
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.uevent = ipack_uevent,
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};
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struct ipack_bus_device *ipack_bus_register(struct device *parent, int slots,
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const struct ipack_bus_ops *ops,
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struct module *owner)
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{
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int bus_nr;
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struct ipack_bus_device *bus;
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bus = kzalloc(sizeof(struct ipack_bus_device), GFP_KERNEL);
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if (!bus)
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return NULL;
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bus_nr = ida_simple_get(&ipack_ida, 0, 0, GFP_KERNEL);
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if (bus_nr < 0) {
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kfree(bus);
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return NULL;
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}
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bus->bus_nr = bus_nr;
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bus->parent = parent;
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bus->slots = slots;
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bus->ops = ops;
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bus->owner = owner;
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return bus;
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}
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EXPORT_SYMBOL_GPL(ipack_bus_register);
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static int ipack_unregister_bus_member(struct device *dev, void *data)
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{
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struct ipack_device *idev = to_ipack_dev(dev);
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struct ipack_bus_device *bus = data;
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if (idev->bus == bus)
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ipack_device_del(idev);
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return 1;
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}
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int ipack_bus_unregister(struct ipack_bus_device *bus)
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{
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bus_for_each_dev(&ipack_bus_type, NULL, bus,
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ipack_unregister_bus_member);
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ida_simple_remove(&ipack_ida, bus->bus_nr);
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kfree(bus);
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return 0;
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}
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EXPORT_SYMBOL_GPL(ipack_bus_unregister);
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int ipack_driver_register(struct ipack_driver *edrv, struct module *owner,
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const char *name)
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{
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edrv->driver.owner = owner;
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edrv->driver.name = name;
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edrv->driver.bus = &ipack_bus_type;
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return driver_register(&edrv->driver);
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}
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EXPORT_SYMBOL_GPL(ipack_driver_register);
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void ipack_driver_unregister(struct ipack_driver *edrv)
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{
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driver_unregister(&edrv->driver);
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}
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EXPORT_SYMBOL_GPL(ipack_driver_unregister);
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static u16 ipack_crc_byte(u16 crc, u8 c)
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{
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int i;
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crc ^= c << 8;
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for (i = 0; i < 8; i++)
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crc = (crc << 1) ^ ((crc & 0x8000) ? 0x1021 : 0);
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return crc;
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}
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/*
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* The algorithm in lib/crc-ccitt.c does not seem to apply since it uses the
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* opposite bit ordering.
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*/
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static u8 ipack_calc_crc1(struct ipack_device *dev)
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{
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u8 c;
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u16 crc;
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unsigned int i;
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crc = 0xffff;
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for (i = 0; i < dev->id_avail; i++) {
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c = (i != 11) ? dev->id[i] : 0;
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crc = ipack_crc_byte(crc, c);
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}
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crc = ~crc;
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return crc & 0xff;
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}
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static u16 ipack_calc_crc2(struct ipack_device *dev)
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{
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u8 c;
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u16 crc;
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unsigned int i;
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crc = 0xffff;
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for (i = 0; i < dev->id_avail; i++) {
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c = ((i != 0x18) && (i != 0x19)) ? dev->id[i] : 0;
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crc = ipack_crc_byte(crc, c);
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}
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crc = ~crc;
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return crc;
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}
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static void ipack_parse_id1(struct ipack_device *dev)
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{
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u8 *id = dev->id;
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u8 crc;
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dev->id_vendor = id[4];
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dev->id_device = id[5];
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dev->speed_8mhz = 1;
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dev->speed_32mhz = (id[7] == 'H');
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crc = ipack_calc_crc1(dev);
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dev->id_crc_correct = (crc == id[11]);
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if (!dev->id_crc_correct) {
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dev_warn(&dev->dev, "ID CRC invalid found 0x%x, expected 0x%x.\n",
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id[11], crc);
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}
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}
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static void ipack_parse_id2(struct ipack_device *dev)
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{
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__be16 *id = (__be16 *) dev->id;
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u16 flags, crc;
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dev->id_vendor = ((be16_to_cpu(id[3]) & 0xff) << 16)
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+ be16_to_cpu(id[4]);
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dev->id_device = be16_to_cpu(id[5]);
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flags = be16_to_cpu(id[10]);
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dev->speed_8mhz = !!(flags & 2);
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dev->speed_32mhz = !!(flags & 4);
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crc = ipack_calc_crc2(dev);
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dev->id_crc_correct = (crc == be16_to_cpu(id[12]));
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if (!dev->id_crc_correct) {
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dev_warn(&dev->dev, "ID CRC invalid found 0x%x, expected 0x%x.\n",
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id[11], crc);
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}
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}
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static int ipack_device_read_id(struct ipack_device *dev)
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{
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u8 __iomem *idmem;
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int i;
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int ret = 0;
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idmem = ioremap(dev->region[IPACK_ID_SPACE].start,
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dev->region[IPACK_ID_SPACE].size);
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if (!idmem) {
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dev_err(&dev->dev, "error mapping memory\n");
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return -ENOMEM;
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}
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/* Determine ID PROM Data Format. If we find the ids "IPAC" or "IPAH"
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* we are dealing with a IndustryPack format 1 device. If we detect
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* "VITA4 " (16 bit big endian formatted) we are dealing with a
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* IndustryPack format 2 device */
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if ((ioread8(idmem + 1) == 'I') &&
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(ioread8(idmem + 3) == 'P') &&
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(ioread8(idmem + 5) == 'A') &&
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((ioread8(idmem + 7) == 'C') ||
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(ioread8(idmem + 7) == 'H'))) {
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dev->id_format = IPACK_ID_VERSION_1;
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dev->id_avail = ioread8(idmem + 0x15);
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if ((dev->id_avail < 0x0c) || (dev->id_avail > 0x40)) {
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dev_warn(&dev->dev, "invalid id size");
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dev->id_avail = 0x0c;
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}
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} else if ((ioread8(idmem + 0) == 'I') &&
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(ioread8(idmem + 1) == 'V') &&
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(ioread8(idmem + 2) == 'A') &&
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(ioread8(idmem + 3) == 'T') &&
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(ioread8(idmem + 4) == ' ') &&
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(ioread8(idmem + 5) == '4')) {
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dev->id_format = IPACK_ID_VERSION_2;
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dev->id_avail = ioread16be(idmem + 0x16);
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if ((dev->id_avail < 0x1a) || (dev->id_avail > 0x40)) {
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dev_warn(&dev->dev, "invalid id size");
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dev->id_avail = 0x1a;
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}
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} else {
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dev->id_format = IPACK_ID_VERSION_INVALID;
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dev->id_avail = 0;
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}
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if (!dev->id_avail) {
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ret = -ENODEV;
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goto out;
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}
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/* Obtain the amount of memory required to store a copy of the complete
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* ID ROM contents */
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dev->id = kmalloc(dev->id_avail, GFP_KERNEL);
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if (!dev->id) {
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dev_err(&dev->dev, "dev->id alloc failed.\n");
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ret = -ENOMEM;
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goto out;
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}
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for (i = 0; i < dev->id_avail; i++) {
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if (dev->id_format == IPACK_ID_VERSION_1)
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dev->id[i] = ioread8(idmem + (i << 1) + 1);
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else
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dev->id[i] = ioread8(idmem + i);
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}
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/* now we can finally work with the copy */
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switch (dev->id_format) {
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case IPACK_ID_VERSION_1:
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ipack_parse_id1(dev);
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break;
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case IPACK_ID_VERSION_2:
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ipack_parse_id2(dev);
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break;
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}
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out:
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iounmap(idmem);
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return ret;
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}
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int ipack_device_init(struct ipack_device *dev)
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{
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int ret;
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dev->dev.bus = &ipack_bus_type;
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dev->dev.release = ipack_device_release;
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dev->dev.parent = dev->bus->parent;
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dev_set_name(&dev->dev,
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"ipack-dev.%u.%u", dev->bus->bus_nr, dev->slot);
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device_initialize(&dev->dev);
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if (dev->bus->ops->set_clockrate(dev, 8))
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dev_warn(&dev->dev, "failed to switch to 8 MHz operation for reading of device ID.\n");
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if (dev->bus->ops->reset_timeout(dev))
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dev_warn(&dev->dev, "failed to reset potential timeout.");
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ret = ipack_device_read_id(dev);
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if (ret < 0) {
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dev_err(&dev->dev, "error reading device id section.\n");
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return ret;
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}
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/* if the device supports 32 MHz operation, use it. */
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if (dev->speed_32mhz) {
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ret = dev->bus->ops->set_clockrate(dev, 32);
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if (ret < 0)
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dev_err(&dev->dev, "failed to switch to 32 MHz operation.\n");
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(ipack_device_init);
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int ipack_device_add(struct ipack_device *dev)
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{
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return device_add(&dev->dev);
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}
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EXPORT_SYMBOL_GPL(ipack_device_add);
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void ipack_device_del(struct ipack_device *dev)
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{
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device_del(&dev->dev);
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ipack_put_device(dev);
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}
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EXPORT_SYMBOL_GPL(ipack_device_del);
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void ipack_get_device(struct ipack_device *dev)
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{
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get_device(&dev->dev);
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}
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EXPORT_SYMBOL_GPL(ipack_get_device);
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void ipack_put_device(struct ipack_device *dev)
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{
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put_device(&dev->dev);
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}
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EXPORT_SYMBOL_GPL(ipack_put_device);
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static int __init ipack_init(void)
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{
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ida_init(&ipack_ida);
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return bus_register(&ipack_bus_type);
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}
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static void __exit ipack_exit(void)
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{
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bus_unregister(&ipack_bus_type);
|
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ida_destroy(&ipack_ida);
|
|
}
|
|
|
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module_init(ipack_init);
|
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module_exit(ipack_exit);
|
|
|
|
MODULE_AUTHOR("Samuel Iglesias Gonsalvez <siglesias@igalia.com>");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("Industry-pack bus core");
|