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920 lines
21 KiB
920 lines
21 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* cs.c -- Kernel Card Services - core services |
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* |
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* The initial developer of the original code is David A. Hinds |
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* <[email protected]>. Portions created by David A. Hinds |
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* are Copyright (C) 1999 David A. Hinds. All Rights Reserved. |
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* |
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* (C) 1999 David A. Hinds |
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*/ |
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#include <linux/module.h> |
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#include <linux/moduleparam.h> |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <linux/string.h> |
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#include <linux/major.h> |
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#include <linux/errno.h> |
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#include <linux/slab.h> |
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#include <linux/mm.h> |
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#include <linux/interrupt.h> |
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#include <linux/timer.h> |
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#include <linux/ioport.h> |
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#include <linux/delay.h> |
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#include <linux/pm.h> |
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#include <linux/device.h> |
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#include <linux/kthread.h> |
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#include <linux/freezer.h> |
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#include <asm/irq.h> |
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#include <pcmcia/ss.h> |
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#include <pcmcia/cistpl.h> |
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#include <pcmcia/cisreg.h> |
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#include <pcmcia/ds.h> |
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#include "cs_internal.h" |
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/* Module parameters */ |
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MODULE_AUTHOR("David Hinds <[email protected]>"); |
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MODULE_DESCRIPTION("Linux Kernel Card Services"); |
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MODULE_LICENSE("GPL"); |
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#define INT_MODULE_PARM(n, v) static int n = v; module_param(n, int, 0444) |
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INT_MODULE_PARM(setup_delay, 10); /* centiseconds */ |
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INT_MODULE_PARM(resume_delay, 20); /* centiseconds */ |
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INT_MODULE_PARM(shutdown_delay, 3); /* centiseconds */ |
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INT_MODULE_PARM(vcc_settle, 40); /* centiseconds */ |
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INT_MODULE_PARM(reset_time, 10); /* usecs */ |
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INT_MODULE_PARM(unreset_delay, 10); /* centiseconds */ |
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INT_MODULE_PARM(unreset_check, 10); /* centiseconds */ |
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INT_MODULE_PARM(unreset_limit, 30); /* unreset_check's */ |
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/* Access speed for attribute memory windows */ |
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INT_MODULE_PARM(cis_speed, 300); /* ns */ |
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socket_state_t dead_socket = { |
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.csc_mask = SS_DETECT, |
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}; |
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EXPORT_SYMBOL(dead_socket); |
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/* List of all sockets, protected by a rwsem */ |
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LIST_HEAD(pcmcia_socket_list); |
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EXPORT_SYMBOL(pcmcia_socket_list); |
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DECLARE_RWSEM(pcmcia_socket_list_rwsem); |
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EXPORT_SYMBOL(pcmcia_socket_list_rwsem); |
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struct pcmcia_socket *pcmcia_get_socket(struct pcmcia_socket *skt) |
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{ |
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struct device *dev = get_device(&skt->dev); |
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if (!dev) |
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return NULL; |
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return dev_get_drvdata(dev); |
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} |
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EXPORT_SYMBOL(pcmcia_get_socket); |
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void pcmcia_put_socket(struct pcmcia_socket *skt) |
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{ |
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put_device(&skt->dev); |
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} |
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EXPORT_SYMBOL(pcmcia_put_socket); |
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static void pcmcia_release_socket(struct device *dev) |
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{ |
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struct pcmcia_socket *socket = dev_get_drvdata(dev); |
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complete(&socket->socket_released); |
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} |
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static int pccardd(void *__skt); |
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/** |
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* pcmcia_register_socket - add a new pcmcia socket device |
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* @socket: the &socket to register |
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*/ |
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int pcmcia_register_socket(struct pcmcia_socket *socket) |
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{ |
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struct task_struct *tsk; |
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int ret; |
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if (!socket || !socket->ops || !socket->dev.parent || !socket->resource_ops) |
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return -EINVAL; |
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dev_dbg(&socket->dev, "pcmcia_register_socket(0x%p)\n", socket->ops); |
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/* try to obtain a socket number [yes, it gets ugly if we |
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* register more than 2^sizeof(unsigned int) pcmcia |
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* sockets... but the socket number is deprecated |
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* anyways, so I don't care] */ |
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down_write(&pcmcia_socket_list_rwsem); |
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if (list_empty(&pcmcia_socket_list)) |
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socket->sock = 0; |
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else { |
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unsigned int found, i = 1; |
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struct pcmcia_socket *tmp; |
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do { |
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found = 1; |
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list_for_each_entry(tmp, &pcmcia_socket_list, socket_list) { |
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if (tmp->sock == i) |
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found = 0; |
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} |
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i++; |
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} while (!found); |
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socket->sock = i - 1; |
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} |
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list_add_tail(&socket->socket_list, &pcmcia_socket_list); |
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up_write(&pcmcia_socket_list_rwsem); |
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#ifndef CONFIG_CARDBUS |
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/* |
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* If we do not support Cardbus, ensure that |
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* the Cardbus socket capability is disabled. |
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*/ |
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socket->features &= ~SS_CAP_CARDBUS; |
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#endif |
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/* set proper values in socket->dev */ |
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dev_set_drvdata(&socket->dev, socket); |
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socket->dev.class = &pcmcia_socket_class; |
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dev_set_name(&socket->dev, "pcmcia_socket%u", socket->sock); |
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/* base address = 0, map = 0 */ |
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socket->cis_mem.flags = 0; |
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socket->cis_mem.speed = cis_speed; |
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INIT_LIST_HEAD(&socket->cis_cache); |
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init_completion(&socket->socket_released); |
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init_completion(&socket->thread_done); |
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mutex_init(&socket->skt_mutex); |
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mutex_init(&socket->ops_mutex); |
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spin_lock_init(&socket->thread_lock); |
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if (socket->resource_ops->init) { |
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mutex_lock(&socket->ops_mutex); |
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ret = socket->resource_ops->init(socket); |
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mutex_unlock(&socket->ops_mutex); |
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if (ret) |
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goto err; |
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} |
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tsk = kthread_run(pccardd, socket, "pccardd"); |
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if (IS_ERR(tsk)) { |
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ret = PTR_ERR(tsk); |
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goto err; |
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} |
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wait_for_completion(&socket->thread_done); |
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if (!socket->thread) { |
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dev_warn(&socket->dev, |
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"PCMCIA: warning: socket thread did not start\n"); |
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return -EIO; |
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} |
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pcmcia_parse_events(socket, SS_DETECT); |
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/* |
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* Let's try to get the PCMCIA module for 16-bit PCMCIA support. |
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* If it fails, it doesn't matter -- we still have 32-bit CardBus |
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* support to offer, so this is not a failure mode. |
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*/ |
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request_module_nowait("pcmcia"); |
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return 0; |
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err: |
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down_write(&pcmcia_socket_list_rwsem); |
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list_del(&socket->socket_list); |
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up_write(&pcmcia_socket_list_rwsem); |
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return ret; |
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} /* pcmcia_register_socket */ |
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EXPORT_SYMBOL(pcmcia_register_socket); |
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/** |
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* pcmcia_unregister_socket - remove a pcmcia socket device |
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* @socket: the &socket to unregister |
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*/ |
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void pcmcia_unregister_socket(struct pcmcia_socket *socket) |
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{ |
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if (!socket) |
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return; |
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dev_dbg(&socket->dev, "pcmcia_unregister_socket(0x%p)\n", socket->ops); |
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if (socket->thread) |
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kthread_stop(socket->thread); |
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/* remove from our own list */ |
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down_write(&pcmcia_socket_list_rwsem); |
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list_del(&socket->socket_list); |
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up_write(&pcmcia_socket_list_rwsem); |
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/* wait for sysfs to drop all references */ |
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if (socket->resource_ops->exit) { |
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mutex_lock(&socket->ops_mutex); |
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socket->resource_ops->exit(socket); |
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mutex_unlock(&socket->ops_mutex); |
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} |
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wait_for_completion(&socket->socket_released); |
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} /* pcmcia_unregister_socket */ |
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EXPORT_SYMBOL(pcmcia_unregister_socket); |
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struct pcmcia_socket *pcmcia_get_socket_by_nr(unsigned int nr) |
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{ |
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struct pcmcia_socket *s; |
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down_read(&pcmcia_socket_list_rwsem); |
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list_for_each_entry(s, &pcmcia_socket_list, socket_list) |
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if (s->sock == nr) { |
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up_read(&pcmcia_socket_list_rwsem); |
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return s; |
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} |
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up_read(&pcmcia_socket_list_rwsem); |
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return NULL; |
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} |
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EXPORT_SYMBOL(pcmcia_get_socket_by_nr); |
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static int socket_reset(struct pcmcia_socket *skt) |
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{ |
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int status, i; |
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dev_dbg(&skt->dev, "reset\n"); |
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skt->socket.flags |= SS_OUTPUT_ENA | SS_RESET; |
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skt->ops->set_socket(skt, &skt->socket); |
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udelay((long)reset_time); |
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skt->socket.flags &= ~SS_RESET; |
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skt->ops->set_socket(skt, &skt->socket); |
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msleep(unreset_delay * 10); |
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for (i = 0; i < unreset_limit; i++) { |
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skt->ops->get_status(skt, &status); |
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if (!(status & SS_DETECT)) |
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return -ENODEV; |
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if (status & SS_READY) |
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return 0; |
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msleep(unreset_check * 10); |
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} |
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dev_err(&skt->dev, "time out after reset\n"); |
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return -ETIMEDOUT; |
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} |
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/* |
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* socket_setup() and socket_shutdown() are called by the main event handler |
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* when card insertion and removal events are received. |
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* socket_setup() turns on socket power and resets the socket, in two stages. |
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* socket_shutdown() unconfigures a socket and turns off socket power. |
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*/ |
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static void socket_shutdown(struct pcmcia_socket *s) |
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{ |
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int status; |
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dev_dbg(&s->dev, "shutdown\n"); |
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if (s->callback) |
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s->callback->remove(s); |
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mutex_lock(&s->ops_mutex); |
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s->state &= SOCKET_INUSE | SOCKET_PRESENT; |
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msleep(shutdown_delay * 10); |
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s->state &= SOCKET_INUSE; |
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/* Blank out the socket state */ |
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s->socket = dead_socket; |
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s->ops->init(s); |
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s->ops->set_socket(s, &s->socket); |
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s->lock_count = 0; |
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kfree(s->fake_cis); |
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s->fake_cis = NULL; |
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s->functions = 0; |
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/* From here on we can be sure that only we (that is, the |
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* pccardd thread) accesses this socket, and all (16-bit) |
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* PCMCIA interactions are gone. Therefore, release |
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* ops_mutex so that we don't get a sysfs-related lockdep |
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* warning. |
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*/ |
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mutex_unlock(&s->ops_mutex); |
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#ifdef CONFIG_CARDBUS |
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cb_free(s); |
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#endif |
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/* give socket some time to power down */ |
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msleep(100); |
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s->ops->get_status(s, &status); |
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if (status & SS_POWERON) { |
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dev_err(&s->dev, |
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"*** DANGER *** unable to remove socket power\n"); |
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} |
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s->state &= ~SOCKET_INUSE; |
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} |
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static int socket_setup(struct pcmcia_socket *skt, int initial_delay) |
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{ |
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int status, i; |
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dev_dbg(&skt->dev, "setup\n"); |
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skt->ops->get_status(skt, &status); |
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if (!(status & SS_DETECT)) |
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return -ENODEV; |
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msleep(initial_delay * 10); |
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for (i = 0; i < 100; i++) { |
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skt->ops->get_status(skt, &status); |
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if (!(status & SS_DETECT)) |
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return -ENODEV; |
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if (!(status & SS_PENDING)) |
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break; |
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msleep(100); |
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} |
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if (status & SS_PENDING) { |
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dev_err(&skt->dev, "voltage interrogation timed out\n"); |
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return -ETIMEDOUT; |
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} |
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if (status & SS_CARDBUS) { |
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if (!(skt->features & SS_CAP_CARDBUS)) { |
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dev_err(&skt->dev, "cardbus cards are not supported\n"); |
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return -EINVAL; |
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} |
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skt->state |= SOCKET_CARDBUS; |
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} else |
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skt->state &= ~SOCKET_CARDBUS; |
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/* |
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* Decode the card voltage requirements, and apply power to the card. |
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*/ |
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if (status & SS_3VCARD) |
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skt->socket.Vcc = skt->socket.Vpp = 33; |
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else if (!(status & SS_XVCARD)) |
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skt->socket.Vcc = skt->socket.Vpp = 50; |
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else { |
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dev_err(&skt->dev, "unsupported voltage key\n"); |
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return -EIO; |
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} |
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if (skt->power_hook) |
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skt->power_hook(skt, HOOK_POWER_PRE); |
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skt->socket.flags = 0; |
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skt->ops->set_socket(skt, &skt->socket); |
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/* |
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* Wait "vcc_settle" for the supply to stabilise. |
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*/ |
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msleep(vcc_settle * 10); |
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skt->ops->get_status(skt, &status); |
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if (!(status & SS_POWERON)) { |
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dev_err(&skt->dev, "unable to apply power\n"); |
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return -EIO; |
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} |
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status = socket_reset(skt); |
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if (skt->power_hook) |
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skt->power_hook(skt, HOOK_POWER_POST); |
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return status; |
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} |
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/* |
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* Handle card insertion. Setup the socket, reset the card, |
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* and then tell the rest of PCMCIA that a card is present. |
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*/ |
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static int socket_insert(struct pcmcia_socket *skt) |
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{ |
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int ret; |
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dev_dbg(&skt->dev, "insert\n"); |
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mutex_lock(&skt->ops_mutex); |
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if (skt->state & SOCKET_INUSE) { |
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mutex_unlock(&skt->ops_mutex); |
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return -EINVAL; |
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} |
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skt->state |= SOCKET_INUSE; |
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ret = socket_setup(skt, setup_delay); |
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if (ret == 0) { |
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skt->state |= SOCKET_PRESENT; |
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dev_notice(&skt->dev, "pccard: %s card inserted into slot %d\n", |
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(skt->state & SOCKET_CARDBUS) ? "CardBus" : "PCMCIA", |
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skt->sock); |
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#ifdef CONFIG_CARDBUS |
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if (skt->state & SOCKET_CARDBUS) { |
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cb_alloc(skt); |
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skt->state |= SOCKET_CARDBUS_CONFIG; |
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} |
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#endif |
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dev_dbg(&skt->dev, "insert done\n"); |
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mutex_unlock(&skt->ops_mutex); |
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if (!(skt->state & SOCKET_CARDBUS) && (skt->callback)) |
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skt->callback->add(skt); |
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} else { |
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mutex_unlock(&skt->ops_mutex); |
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socket_shutdown(skt); |
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} |
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return ret; |
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} |
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static int socket_suspend(struct pcmcia_socket *skt) |
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{ |
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if ((skt->state & SOCKET_SUSPEND) && !(skt->state & SOCKET_IN_RESUME)) |
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return -EBUSY; |
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mutex_lock(&skt->ops_mutex); |
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/* store state on first suspend, but not after spurious wakeups */ |
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if (!(skt->state & SOCKET_IN_RESUME)) |
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skt->suspended_state = skt->state; |
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skt->socket = dead_socket; |
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skt->ops->set_socket(skt, &skt->socket); |
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if (skt->ops->suspend) |
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skt->ops->suspend(skt); |
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skt->state |= SOCKET_SUSPEND; |
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skt->state &= ~SOCKET_IN_RESUME; |
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mutex_unlock(&skt->ops_mutex); |
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return 0; |
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} |
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static int socket_early_resume(struct pcmcia_socket *skt) |
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{ |
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mutex_lock(&skt->ops_mutex); |
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skt->socket = dead_socket; |
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skt->ops->init(skt); |
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skt->ops->set_socket(skt, &skt->socket); |
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if (skt->state & SOCKET_PRESENT) |
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skt->resume_status = socket_setup(skt, resume_delay); |
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skt->state |= SOCKET_IN_RESUME; |
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mutex_unlock(&skt->ops_mutex); |
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return 0; |
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} |
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static int socket_late_resume(struct pcmcia_socket *skt) |
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{ |
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int ret = 0; |
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mutex_lock(&skt->ops_mutex); |
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skt->state &= ~(SOCKET_SUSPEND | SOCKET_IN_RESUME); |
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mutex_unlock(&skt->ops_mutex); |
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if (!(skt->state & SOCKET_PRESENT)) { |
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ret = socket_insert(skt); |
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if (ret == -ENODEV) |
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ret = 0; |
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return ret; |
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} |
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if (skt->resume_status) { |
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socket_shutdown(skt); |
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return 0; |
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} |
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if (skt->suspended_state != skt->state) { |
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dev_dbg(&skt->dev, |
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"suspend state 0x%x != resume state 0x%x\n", |
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skt->suspended_state, skt->state); |
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socket_shutdown(skt); |
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return socket_insert(skt); |
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} |
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if (!(skt->state & SOCKET_CARDBUS) && (skt->callback)) |
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ret = skt->callback->early_resume(skt); |
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return ret; |
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} |
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/* |
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* Finalize the resume. In case of a cardbus socket, we have |
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* to rebind the devices as we can't be certain that it has been |
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* replaced, or not. |
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*/ |
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static int socket_complete_resume(struct pcmcia_socket *skt) |
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{ |
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int ret = 0; |
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#ifdef CONFIG_CARDBUS |
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if (skt->state & SOCKET_CARDBUS) { |
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/* We can't be sure the CardBus card is the same |
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* as the one previously inserted. Therefore, remove |
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* and re-add... */ |
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cb_free(skt); |
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ret = cb_alloc(skt); |
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if (ret) |
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cb_free(skt); |
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} |
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#endif |
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return ret; |
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} |
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/* |
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* Resume a socket. If a card is present, verify its CIS against |
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* our cached copy. If they are different, the card has been |
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* replaced, and we need to tell the drivers. |
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*/ |
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static int socket_resume(struct pcmcia_socket *skt) |
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{ |
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int err; |
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if (!(skt->state & SOCKET_SUSPEND)) |
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return -EBUSY; |
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socket_early_resume(skt); |
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err = socket_late_resume(skt); |
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if (!err) |
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err = socket_complete_resume(skt); |
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return err; |
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} |
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static void socket_remove(struct pcmcia_socket *skt) |
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{ |
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dev_notice(&skt->dev, "pccard: card ejected from slot %d\n", skt->sock); |
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socket_shutdown(skt); |
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} |
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/* |
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* Process a socket card detect status change. |
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* |
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* If we don't have a card already present, delay the detect event for |
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* about 20ms (to be on the safe side) before reading the socket status. |
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* |
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* Some i82365-based systems send multiple SS_DETECT events during card |
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* insertion, and the "card present" status bit seems to bounce. This |
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* will probably be true with GPIO-based card detection systems after |
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* the product has aged. |
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*/ |
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static void socket_detect_change(struct pcmcia_socket *skt) |
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{ |
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if (!(skt->state & SOCKET_SUSPEND)) { |
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int status; |
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if (!(skt->state & SOCKET_PRESENT)) |
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msleep(20); |
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skt->ops->get_status(skt, &status); |
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if ((skt->state & SOCKET_PRESENT) && |
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!(status & SS_DETECT)) |
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socket_remove(skt); |
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if (!(skt->state & SOCKET_PRESENT) && |
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(status & SS_DETECT)) |
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socket_insert(skt); |
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} |
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} |
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static int pccardd(void *__skt) |
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{ |
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struct pcmcia_socket *skt = __skt; |
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int ret; |
|
|
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skt->thread = current; |
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skt->socket = dead_socket; |
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skt->ops->init(skt); |
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skt->ops->set_socket(skt, &skt->socket); |
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|
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/* register with the device core */ |
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ret = device_register(&skt->dev); |
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if (ret) { |
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dev_warn(&skt->dev, "PCMCIA: unable to register socket\n"); |
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skt->thread = NULL; |
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complete(&skt->thread_done); |
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return 0; |
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} |
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ret = pccard_sysfs_add_socket(&skt->dev); |
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if (ret) |
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dev_warn(&skt->dev, "err %d adding socket attributes\n", ret); |
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|
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complete(&skt->thread_done); |
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|
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/* wait for userspace to catch up */ |
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msleep(250); |
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|
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set_freezable(); |
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for (;;) { |
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unsigned long flags; |
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unsigned int events; |
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unsigned int sysfs_events; |
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|
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spin_lock_irqsave(&skt->thread_lock, flags); |
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events = skt->thread_events; |
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skt->thread_events = 0; |
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sysfs_events = skt->sysfs_events; |
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skt->sysfs_events = 0; |
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spin_unlock_irqrestore(&skt->thread_lock, flags); |
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|
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mutex_lock(&skt->skt_mutex); |
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if (events & SS_DETECT) |
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socket_detect_change(skt); |
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|
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if (sysfs_events) { |
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if (sysfs_events & PCMCIA_UEVENT_EJECT) |
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socket_remove(skt); |
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if (sysfs_events & PCMCIA_UEVENT_INSERT) |
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socket_insert(skt); |
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if ((sysfs_events & PCMCIA_UEVENT_SUSPEND) && |
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!(skt->state & SOCKET_CARDBUS)) { |
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if (skt->callback) |
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ret = skt->callback->suspend(skt); |
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else |
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ret = 0; |
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if (!ret) { |
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socket_suspend(skt); |
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msleep(100); |
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} |
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} |
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if ((sysfs_events & PCMCIA_UEVENT_RESUME) && |
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!(skt->state & SOCKET_CARDBUS)) { |
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ret = socket_resume(skt); |
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if (!ret && skt->callback) |
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skt->callback->resume(skt); |
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} |
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if ((sysfs_events & PCMCIA_UEVENT_REQUERY) && |
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!(skt->state & SOCKET_CARDBUS)) { |
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if (!ret && skt->callback) |
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skt->callback->requery(skt); |
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} |
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} |
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mutex_unlock(&skt->skt_mutex); |
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|
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if (events || sysfs_events) |
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continue; |
|
|
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if (kthread_should_stop()) |
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break; |
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|
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set_current_state(TASK_INTERRUPTIBLE); |
|
|
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schedule(); |
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|
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/* make sure we are running */ |
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__set_current_state(TASK_RUNNING); |
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|
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try_to_freeze(); |
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} |
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|
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/* shut down socket, if a device is still present */ |
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if (skt->state & SOCKET_PRESENT) { |
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mutex_lock(&skt->skt_mutex); |
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socket_remove(skt); |
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mutex_unlock(&skt->skt_mutex); |
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} |
|
|
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/* remove from the device core */ |
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pccard_sysfs_remove_socket(&skt->dev); |
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device_unregister(&skt->dev); |
|
|
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return 0; |
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} |
|
|
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/* |
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* Yenta (at least) probes interrupts before registering the socket and |
|
* starting the handler thread. |
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*/ |
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void pcmcia_parse_events(struct pcmcia_socket *s, u_int events) |
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{ |
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unsigned long flags; |
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dev_dbg(&s->dev, "parse_events: events %08x\n", events); |
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if (s->thread) { |
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spin_lock_irqsave(&s->thread_lock, flags); |
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s->thread_events |= events; |
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spin_unlock_irqrestore(&s->thread_lock, flags); |
|
|
|
wake_up_process(s->thread); |
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} |
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} /* pcmcia_parse_events */ |
|
EXPORT_SYMBOL(pcmcia_parse_events); |
|
|
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/** |
|
* pcmcia_parse_uevents() - tell pccardd to issue manual commands |
|
* @s: the PCMCIA socket we wan't to command |
|
* @events: events to pass to pccardd |
|
* |
|
* userspace-issued insert, eject, suspend and resume commands must be |
|
* handled by pccardd to avoid any sysfs-related deadlocks. Valid events |
|
* are PCMCIA_UEVENT_EJECT (for eject), PCMCIA_UEVENT__INSERT (for insert), |
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* PCMCIA_UEVENT_RESUME (for resume), PCMCIA_UEVENT_SUSPEND (for suspend) |
|
* and PCMCIA_UEVENT_REQUERY (for re-querying the PCMCIA card). |
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*/ |
|
void pcmcia_parse_uevents(struct pcmcia_socket *s, u_int events) |
|
{ |
|
unsigned long flags; |
|
dev_dbg(&s->dev, "parse_uevents: events %08x\n", events); |
|
if (s->thread) { |
|
spin_lock_irqsave(&s->thread_lock, flags); |
|
s->sysfs_events |= events; |
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spin_unlock_irqrestore(&s->thread_lock, flags); |
|
|
|
wake_up_process(s->thread); |
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} |
|
} |
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EXPORT_SYMBOL(pcmcia_parse_uevents); |
|
|
|
|
|
/* register pcmcia_callback */ |
|
int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c) |
|
{ |
|
int ret = 0; |
|
|
|
/* s->skt_mutex also protects s->callback */ |
|
mutex_lock(&s->skt_mutex); |
|
|
|
if (c) { |
|
/* registration */ |
|
if (s->callback) { |
|
ret = -EBUSY; |
|
goto err; |
|
} |
|
|
|
s->callback = c; |
|
|
|
if ((s->state & (SOCKET_PRESENT|SOCKET_CARDBUS)) == SOCKET_PRESENT) |
|
s->callback->add(s); |
|
} else |
|
s->callback = NULL; |
|
err: |
|
mutex_unlock(&s->skt_mutex); |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL(pccard_register_pcmcia); |
|
|
|
|
|
/* I'm not sure which "reset" function this is supposed to use, |
|
* but for now, it uses the low-level interface's reset, not the |
|
* CIS register. |
|
*/ |
|
|
|
int pcmcia_reset_card(struct pcmcia_socket *skt) |
|
{ |
|
int ret; |
|
|
|
dev_dbg(&skt->dev, "resetting socket\n"); |
|
|
|
mutex_lock(&skt->skt_mutex); |
|
do { |
|
if (!(skt->state & SOCKET_PRESENT)) { |
|
dev_dbg(&skt->dev, "can't reset, not present\n"); |
|
ret = -ENODEV; |
|
break; |
|
} |
|
if (skt->state & SOCKET_SUSPEND) { |
|
dev_dbg(&skt->dev, "can't reset, suspended\n"); |
|
ret = -EBUSY; |
|
break; |
|
} |
|
if (skt->state & SOCKET_CARDBUS) { |
|
dev_dbg(&skt->dev, "can't reset, is cardbus\n"); |
|
ret = -EPERM; |
|
break; |
|
} |
|
|
|
if (skt->callback) |
|
skt->callback->suspend(skt); |
|
mutex_lock(&skt->ops_mutex); |
|
ret = socket_reset(skt); |
|
mutex_unlock(&skt->ops_mutex); |
|
if ((ret == 0) && (skt->callback)) |
|
skt->callback->resume(skt); |
|
|
|
ret = 0; |
|
} while (0); |
|
mutex_unlock(&skt->skt_mutex); |
|
|
|
return ret; |
|
} /* reset_card */ |
|
EXPORT_SYMBOL(pcmcia_reset_card); |
|
|
|
|
|
static int pcmcia_socket_uevent(struct device *dev, |
|
struct kobj_uevent_env *env) |
|
{ |
|
struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev); |
|
|
|
if (add_uevent_var(env, "SOCKET_NO=%u", s->sock)) |
|
return -ENOMEM; |
|
|
|
return 0; |
|
} |
|
|
|
|
|
static struct completion pcmcia_unload; |
|
|
|
static void pcmcia_release_socket_class(struct class *data) |
|
{ |
|
complete(&pcmcia_unload); |
|
} |
|
|
|
|
|
#ifdef CONFIG_PM |
|
|
|
static int __pcmcia_pm_op(struct device *dev, |
|
int (*callback) (struct pcmcia_socket *skt)) |
|
{ |
|
struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev); |
|
int ret; |
|
|
|
mutex_lock(&s->skt_mutex); |
|
ret = callback(s); |
|
mutex_unlock(&s->skt_mutex); |
|
|
|
return ret; |
|
} |
|
|
|
static int pcmcia_socket_dev_suspend_noirq(struct device *dev) |
|
{ |
|
return __pcmcia_pm_op(dev, socket_suspend); |
|
} |
|
|
|
static int pcmcia_socket_dev_resume_noirq(struct device *dev) |
|
{ |
|
return __pcmcia_pm_op(dev, socket_early_resume); |
|
} |
|
|
|
static int __used pcmcia_socket_dev_resume(struct device *dev) |
|
{ |
|
return __pcmcia_pm_op(dev, socket_late_resume); |
|
} |
|
|
|
static void __used pcmcia_socket_dev_complete(struct device *dev) |
|
{ |
|
WARN(__pcmcia_pm_op(dev, socket_complete_resume), |
|
"failed to complete resume"); |
|
} |
|
|
|
static const struct dev_pm_ops pcmcia_socket_pm_ops = { |
|
/* dev_resume may be called with IRQs enabled */ |
|
SET_SYSTEM_SLEEP_PM_OPS(NULL, |
|
pcmcia_socket_dev_resume) |
|
|
|
/* late suspend must be called with IRQs disabled */ |
|
.suspend_noirq = pcmcia_socket_dev_suspend_noirq, |
|
.freeze_noirq = pcmcia_socket_dev_suspend_noirq, |
|
.poweroff_noirq = pcmcia_socket_dev_suspend_noirq, |
|
|
|
/* early resume must be called with IRQs disabled */ |
|
.resume_noirq = pcmcia_socket_dev_resume_noirq, |
|
.thaw_noirq = pcmcia_socket_dev_resume_noirq, |
|
.restore_noirq = pcmcia_socket_dev_resume_noirq, |
|
.complete = pcmcia_socket_dev_complete, |
|
}; |
|
|
|
#define PCMCIA_SOCKET_CLASS_PM_OPS (&pcmcia_socket_pm_ops) |
|
|
|
#else /* CONFIG_PM */ |
|
|
|
#define PCMCIA_SOCKET_CLASS_PM_OPS NULL |
|
|
|
#endif /* CONFIG_PM */ |
|
|
|
struct class pcmcia_socket_class = { |
|
.name = "pcmcia_socket", |
|
.dev_uevent = pcmcia_socket_uevent, |
|
.dev_release = pcmcia_release_socket, |
|
.class_release = pcmcia_release_socket_class, |
|
.pm = PCMCIA_SOCKET_CLASS_PM_OPS, |
|
}; |
|
EXPORT_SYMBOL(pcmcia_socket_class); |
|
|
|
|
|
static int __init init_pcmcia_cs(void) |
|
{ |
|
init_completion(&pcmcia_unload); |
|
return class_register(&pcmcia_socket_class); |
|
} |
|
|
|
static void __exit exit_pcmcia_cs(void) |
|
{ |
|
class_unregister(&pcmcia_socket_class); |
|
wait_for_completion(&pcmcia_unload); |
|
} |
|
|
|
subsys_initcall(init_pcmcia_cs); |
|
module_exit(exit_pcmcia_cs); |
|
|
|
|