firewire: Add device probing and sysfs integration.
Signed-off-by: Kristian Høgsberg <krh@redhat.com> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Kristian Høgsberg
committed by
Stefan Richter
Stefan Richter
parent
3038e353cf
commit
19a15b937b
613
drivers/firewire/fw-device.c
Normal file
613
drivers/firewire/fw-device.c
Normal file
@@ -0,0 +1,613 @@
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/* -*- c-basic-offset: 8 -*-
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*
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* fw-device.c - Device probing and sysfs code.
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*
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* Copyright (C) 2005-2006 Kristian Hoegsberg <krh@bitplanet.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <linux/module.h>
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#include <linux/wait.h>
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#include <linux/errno.h>
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#include <linux/kthread.h>
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#include <linux/device.h>
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#include <linux/delay.h>
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#include "fw-transaction.h"
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#include "fw-topology.h"
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#include "fw-device.h"
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void fw_csr_iterator_init(struct fw_csr_iterator *ci, u32 * p)
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{
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ci->p = p + 1;
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ci->end = ci->p + (p[0] >> 16);
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}
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EXPORT_SYMBOL(fw_csr_iterator_init);
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int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value)
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{
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*key = *ci->p >> 24;
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*value = *ci->p & 0xffffff;
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return ci->p++ < ci->end;
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}
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EXPORT_SYMBOL(fw_csr_iterator_next);
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static int is_fw_unit(struct device *dev);
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static int match_unit_directory(u32 * directory, struct fw_device_id *id)
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{
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struct fw_csr_iterator ci;
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int key, value, match;
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match = 0;
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fw_csr_iterator_init(&ci, directory);
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while (fw_csr_iterator_next(&ci, &key, &value)) {
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if (key == CSR_VENDOR && value == id->vendor)
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match |= FW_MATCH_VENDOR;
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if (key == CSR_MODEL && value == id->model)
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match |= FW_MATCH_MODEL;
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if (key == CSR_SPECIFIER_ID && value == id->specifier_id)
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match |= FW_MATCH_SPECIFIER_ID;
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if (key == CSR_VERSION && value == id->version)
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match |= FW_MATCH_VERSION;
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}
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return (match & id->match_flags) == id->match_flags;
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}
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static int fw_unit_match(struct device *dev, struct device_driver *drv)
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{
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struct fw_unit *unit = fw_unit(dev);
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struct fw_driver *driver = fw_driver(drv);
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int i;
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/* We only allow binding to fw_units. */
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if (!is_fw_unit(dev))
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return 0;
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for (i = 0; driver->id_table[i].match_flags != 0; i++) {
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if (match_unit_directory(unit->directory, &driver->id_table[i]))
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return 1;
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}
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return 0;
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}
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static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size)
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{
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struct fw_device *device = fw_device(unit->device.parent);
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struct fw_csr_iterator ci;
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int key, value;
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int vendor = 0;
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int model = 0;
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int specifier_id = 0;
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int version = 0;
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fw_csr_iterator_init(&ci, &device->config_rom[5]);
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while (fw_csr_iterator_next(&ci, &key, &value)) {
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switch (key) {
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case CSR_VENDOR:
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vendor = value;
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break;
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case CSR_MODEL:
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model = value;
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break;
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}
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}
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fw_csr_iterator_init(&ci, unit->directory);
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while (fw_csr_iterator_next(&ci, &key, &value)) {
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switch (key) {
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case CSR_SPECIFIER_ID:
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specifier_id = value;
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break;
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case CSR_VERSION:
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version = value;
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break;
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}
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}
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return snprintf(buffer, buffer_size,
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"ieee1394:ven%08Xmo%08Xsp%08Xver%08X",
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vendor, model, specifier_id, version);
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}
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static int
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fw_unit_uevent(struct device *dev, char **envp, int num_envp,
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char *buffer, int buffer_size)
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{
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struct fw_unit *unit = fw_unit(dev);
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char modalias[64];
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int length = 0;
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int i = 0;
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if (!is_fw_unit(dev))
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goto out;
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get_modalias(unit, modalias, sizeof modalias);
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if (add_uevent_var(envp, num_envp, &i,
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buffer, buffer_size, &length,
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"MODALIAS=%s", modalias))
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return -ENOMEM;
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out:
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envp[i] = NULL;
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return 0;
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}
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struct bus_type fw_bus_type = {
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.name = "fw",
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.match = fw_unit_match,
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.uevent = fw_unit_uevent
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};
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EXPORT_SYMBOL(fw_bus_type);
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extern struct fw_device *fw_device_get(struct fw_device *device)
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{
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get_device(&device->device);
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return device;
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}
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extern void fw_device_put(struct fw_device *device)
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{
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put_device(&device->device);
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}
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static void fw_device_release(struct device *dev)
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{
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struct fw_device *device = fw_device(dev);
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unsigned long flags;
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/* Take the card lock so we don't set this to NULL while a
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* FW_NODE_UPDATED callback is being handled. */
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spin_lock_irqsave(&device->card->lock, flags);
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device->node->data = NULL;
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spin_unlock_irqrestore(&device->card->lock, flags);
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fw_node_put(device->node);
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fw_card_put(device->card);
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kfree(device->config_rom);
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kfree(device);
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}
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int fw_device_enable_phys_dma(struct fw_device *device)
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{
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return device->card->driver->enable_phys_dma(device->card,
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device->node_id,
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device->generation);
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}
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EXPORT_SYMBOL(fw_device_enable_phys_dma);
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static ssize_t
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show_modalias_attribute(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct fw_unit *unit = fw_unit(dev);
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int length;
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length = get_modalias(unit, buf, PAGE_SIZE);
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strcpy(buf + length, "\n");
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return length + 1;
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}
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static struct device_attribute modalias_attribute = {
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.attr = {.name = "modalias",.mode = S_IRUGO},
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.show = show_modalias_attribute
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};
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static ssize_t
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show_config_rom_attribute(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct fw_device *device = fw_device(dev);
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memcpy(buf, device->config_rom, device->config_rom_length * 4);
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return device->config_rom_length * 4;
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}
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static struct device_attribute config_rom_attribute = {
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.attr = {.name = "config_rom",.mode = S_IRUGO},
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.show = show_config_rom_attribute,
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};
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struct read_quadlet_callback_data {
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struct completion done;
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int rcode;
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u32 data;
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};
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static void
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complete_transaction(struct fw_card *card, int rcode,
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void *payload, size_t length, void *data)
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{
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struct read_quadlet_callback_data *callback_data = data;
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if (rcode == RCODE_COMPLETE)
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callback_data->data = be32_to_cpu(*(__be32 *)payload);
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callback_data->rcode = rcode;
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complete(&callback_data->done);
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}
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static int read_rom(struct fw_device *device, int index, u32 * data)
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{
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struct read_quadlet_callback_data callback_data;
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struct fw_transaction t;
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u64 offset;
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init_completion(&callback_data.done);
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offset = 0xfffff0000400ULL + index * 4;
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fw_send_request(device->card, &t, TCODE_READ_QUADLET_REQUEST,
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device->node_id | LOCAL_BUS,
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device->generation, SCODE_100,
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offset, NULL, 4, complete_transaction, &callback_data);
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wait_for_completion(&callback_data.done);
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*data = callback_data.data;
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return callback_data.rcode;
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}
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static int read_bus_info_block(struct fw_device *device)
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{
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static u32 rom[256];
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u32 stack[16], sp, key;
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int i, end, length;
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/* First read the bus info block. */
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for (i = 0; i < 5; i++) {
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if (read_rom(device, i, &rom[i]) != RCODE_COMPLETE)
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return -1;
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/* As per IEEE1212 7.2, during power-up, devices can
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* reply with a 0 for the first quadlet of the config
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* rom to indicate that they are booting (for example,
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* if the firmware is on the disk of a external
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* harddisk). In that case we just fail, and the
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* retry mechanism will try again later. */
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if (i == 0 && rom[i] == 0)
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return -1;
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}
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/* Now parse the config rom. The config rom is a recursive
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* directory structure so we parse it using a stack of
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* references to the blocks that make up the structure. We
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* push a reference to the root directory on the stack to
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* start things off. */
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length = i;
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sp = 0;
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stack[sp++] = 0xc0000005;
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while (sp > 0) {
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/* Pop the next block reference of the stack. The
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* lower 24 bits is the offset into the config rom,
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* the upper 8 bits are the type of the reference the
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* block. */
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key = stack[--sp];
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i = key & 0xffffff;
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if (i >= ARRAY_SIZE(rom))
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/* The reference points outside the standard
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* config rom area, something's fishy. */
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return -1;
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/* Read header quadlet for the block to get the length. */
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if (read_rom(device, i, &rom[i]) != RCODE_COMPLETE)
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return -1;
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end = i + (rom[i] >> 16) + 1;
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i++;
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if (end > ARRAY_SIZE(rom))
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/* This block extends outside standard config
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* area (and the array we're reading it
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* into). That's broken, so ignore this
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* device. */
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return -1;
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/* Now read in the block. If this is a directory
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* block, check the entries as we read them to see if
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* it references another block, and push it in that case. */
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while (i < end) {
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if (read_rom(device, i, &rom[i]) != RCODE_COMPLETE)
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return -1;
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if ((key >> 30) == 3 && (rom[i] >> 30) > 1 &&
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sp < ARRAY_SIZE(stack))
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stack[sp++] = i + rom[i];
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i++;
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}
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if (length < i)
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length = i;
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}
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device->config_rom = kmalloc(length * 4, GFP_KERNEL);
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if (device->config_rom == NULL)
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return -1;
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memcpy(device->config_rom, rom, length * 4);
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device->config_rom_length = length;
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return 0;
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}
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static void fw_unit_release(struct device *dev)
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{
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struct fw_unit *unit = fw_unit(dev);
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kfree(unit);
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}
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static int is_fw_unit(struct device *dev)
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{
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return dev->release == fw_unit_release;
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}
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static void create_units(struct fw_device *device)
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{
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struct fw_csr_iterator ci;
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struct fw_unit *unit;
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int key, value, i;
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i = 0;
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fw_csr_iterator_init(&ci, &device->config_rom[5]);
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while (fw_csr_iterator_next(&ci, &key, &value)) {
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if (key != (CSR_UNIT | CSR_DIRECTORY))
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continue;
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/* Get the address of the unit directory and try to
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* match the drivers id_tables against it. */
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unit = kzalloc(sizeof *unit, GFP_KERNEL);
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if (unit == NULL) {
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fw_error("failed to allocate memory for unit\n");
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continue;
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}
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unit->directory = ci.p + value - 1;
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unit->device.bus = &fw_bus_type;
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unit->device.release = fw_unit_release;
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unit->device.parent = &device->device;
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snprintf(unit->device.bus_id, sizeof unit->device.bus_id,
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"%s.%d", device->device.bus_id, i++);
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if (device_register(&unit->device) < 0) {
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kfree(unit);
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continue;
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}
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if (device_create_file(&unit->device, &modalias_attribute) < 0) {
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device_unregister(&unit->device);
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kfree(unit);
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}
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}
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}
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static int shutdown_unit(struct device *device, void *data)
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{
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struct fw_unit *unit = fw_unit(device);
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if (is_fw_unit(device)) {
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device_remove_file(&unit->device, &modalias_attribute);
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device_unregister(&unit->device);
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}
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return 0;
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}
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static void fw_device_shutdown(struct work_struct *work)
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{
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struct fw_device *device =
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container_of(work, struct fw_device, work.work);
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device_remove_file(&device->device, &config_rom_attribute);
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cdev_del(&device->cdev);
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unregister_chrdev_region(device->device.devt, 1);
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device_for_each_child(&device->device, NULL, shutdown_unit);
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device_unregister(&device->device);
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}
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/* These defines control the retry behavior for reading the config
|
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* rom. It shouldn't be necessary to tweak these; if the device
|
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* doesn't respond to a config rom read within 10 seconds, it's not
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* going to respond at all. As for the initial delay, a lot of
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* devices will be able to respond within half a second after bus
|
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* reset. On the other hand, it's not really worth being more
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* aggressive than that, since it scales pretty well; if 10 devices
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* are plugged in, they're all getting read within one second. */
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#define MAX_RETRIES 5
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#define RETRY_DELAY (2 * HZ)
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#define INITIAL_DELAY (HZ / 2)
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static void fw_device_init(struct work_struct *work)
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{
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static int serial;
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struct fw_device *device =
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container_of(work, struct fw_device, work.work);
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/* All failure paths here set node->data to NULL, so that we
|
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* don't try to do device_for_each_child() on a kfree()'d
|
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* device. */
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if (read_bus_info_block(device) < 0) {
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if (device->config_rom_retries < MAX_RETRIES) {
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device->config_rom_retries++;
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schedule_delayed_work(&device->work, RETRY_DELAY);
|
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} else {
|
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fw_notify("giving up on config rom for node id %d\n",
|
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device->node_id);
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fw_device_release(&device->device);
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}
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return;
|
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}
|
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|
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device->device.bus = &fw_bus_type;
|
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device->device.release = fw_device_release;
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device->device.parent = device->card->device;
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snprintf(device->device.bus_id, sizeof device->device.bus_id,
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"fw%d", serial++);
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if (alloc_chrdev_region(&device->device.devt, 0, 1, "fw")) {
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fw_error("Failed to register char device region.\n");
|
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goto error;
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}
|
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cdev_init(&device->cdev, &fw_device_ops);
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device->cdev.owner = THIS_MODULE;
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kobject_set_name(&device->cdev.kobj, device->device.bus_id);
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if (cdev_add(&device->cdev, device->device.devt, 1)) {
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fw_error("Failed to register char device.\n");
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goto error;
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}
|
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|
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if (device_add(&device->device)) {
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fw_error("Failed to add device.\n");
|
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goto error;
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}
|
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|
||||
if (device_create_file(&device->device, &config_rom_attribute) < 0) {
|
||||
fw_error("Failed to create config rom file.\n");
|
||||
goto error_with_device;
|
||||
}
|
||||
|
||||
create_units(device);
|
||||
|
||||
/* Transition the device to running state. If it got pulled
|
||||
* out from under us while we did the intialization work, we
|
||||
* have to shut down the device again here. Normally, though,
|
||||
* fw_node_event will be responsible for shutting it down when
|
||||
* necessary. We have to use the atomic cmpxchg here to avoid
|
||||
* racing with the FW_NODE_DESTROYED case in
|
||||
* fw_node_event(). */
|
||||
if (cmpxchg(&device->state,
|
||||
FW_DEVICE_INITIALIZING,
|
||||
FW_DEVICE_RUNNING) == FW_DEVICE_SHUTDOWN)
|
||||
fw_device_shutdown(&device->work.work);
|
||||
else
|
||||
fw_notify("created new fw device %s (%d config rom retries)\n",
|
||||
device->device.bus_id, device->config_rom_retries);
|
||||
|
||||
/* Reschedule the IRM work if we just finished reading the
|
||||
* root node config rom. If this races with a bus reset we
|
||||
* just end up running the IRM work a couple of extra times -
|
||||
* pretty harmless. */
|
||||
if (device->node == device->card->root_node)
|
||||
schedule_delayed_work(&device->card->work, 0);
|
||||
|
||||
return;
|
||||
|
||||
error_with_device:
|
||||
device_del(&device->device);
|
||||
error:
|
||||
cdev_del(&device->cdev);
|
||||
unregister_chrdev_region(device->device.devt, 1);
|
||||
put_device(&device->device);
|
||||
}
|
||||
|
||||
static int update_unit(struct device *dev, void *data)
|
||||
{
|
||||
struct fw_unit *unit = fw_unit(dev);
|
||||
struct fw_driver *driver = (struct fw_driver *)dev->driver;
|
||||
|
||||
if (is_fw_unit(dev) && driver != NULL && driver->update != NULL)
|
||||
driver->update(unit);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
void fw_node_event(struct fw_card *card, struct fw_node *node, int event)
|
||||
{
|
||||
struct fw_device *device;
|
||||
|
||||
/* Ignore events for the local node (i.e. the node that
|
||||
* corresponds to the ieee1394 controller in this linux box). */
|
||||
if (node == card->local_node)
|
||||
return;
|
||||
|
||||
switch (event) {
|
||||
case FW_NODE_CREATED:
|
||||
case FW_NODE_LINK_ON:
|
||||
if (!node->link_on)
|
||||
break;
|
||||
|
||||
device = kzalloc(sizeof(*device), GFP_ATOMIC);
|
||||
if (device == NULL)
|
||||
break;
|
||||
|
||||
/* Do minimal intialization of the device here, the
|
||||
* rest will happen in fw_device_init(). We need the
|
||||
* card and node so we can read the config rom and we
|
||||
* need to do device_initialize() now so
|
||||
* device_for_each_child() in FW_NODE_UPDATED is
|
||||
* doesn't freak out. */
|
||||
device_initialize(&device->device);
|
||||
device->state = FW_DEVICE_INITIALIZING;
|
||||
device->card = fw_card_get(card);
|
||||
device->node = fw_node_get(node);
|
||||
device->node_id = node->node_id;
|
||||
device->generation = card->generation;
|
||||
|
||||
/* Set the node data to point back to this device so
|
||||
* FW_NODE_UPDATED callbacks can update the node_id
|
||||
* and generation for the device. */
|
||||
node->data = device;
|
||||
|
||||
/* Many devices are slow to respond after bus resets,
|
||||
* especially if they are bus powered and go through
|
||||
* power-up after getting plugged in. We schedule the
|
||||
* first config rom scan half a second after bus reset. */
|
||||
INIT_DELAYED_WORK(&device->work, fw_device_init);
|
||||
schedule_delayed_work(&device->work, INITIAL_DELAY);
|
||||
break;
|
||||
|
||||
case FW_NODE_UPDATED:
|
||||
if (!node->link_on || node->data == NULL)
|
||||
break;
|
||||
|
||||
device = node->data;
|
||||
device->node_id = node->node_id;
|
||||
device->generation = card->generation;
|
||||
device_for_each_child(&device->device, NULL, update_unit);
|
||||
break;
|
||||
|
||||
case FW_NODE_DESTROYED:
|
||||
case FW_NODE_LINK_OFF:
|
||||
if (!node->data)
|
||||
break;
|
||||
|
||||
/* Destroy the device associated with the node. There
|
||||
* are two cases here: either the device is fully
|
||||
* initialized (FW_DEVICE_RUNNING) or we're in the
|
||||
* process of reading its config rom
|
||||
* (FW_DEVICE_INITIALIZING). If it is fully
|
||||
* initialized we can reuse device->work to schedule a
|
||||
* full fw_device_shutdown(). If not, there's work
|
||||
* scheduled to read it's config rom, and we just put
|
||||
* the device in shutdown state to have that code fail
|
||||
* to create the device. */
|
||||
device = node->data;
|
||||
if (xchg(&device->state,
|
||||
FW_DEVICE_SHUTDOWN) == FW_DEVICE_RUNNING) {
|
||||
INIT_DELAYED_WORK(&device->work, fw_device_shutdown);
|
||||
schedule_delayed_work(&device->work, 0);
|
||||
}
|
||||
break;
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user