pci_hotplug_core.c

audio driver for hotplug pci on linux 2.6.27

/*
 * PCI HotPlug Controller Core
 *
 * Copyright (C) 2001-2002 Greg Kroah-Hartman ([e-mail])
 * Copyright (C) 2001-2002 IBM Corp.
 *
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 * NON INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Send feedback to <[e-mail]>
 *
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/list.h>
#include <linux/kobject.h>
#include <linux/sysfs.h>
#include <linux/pagemap.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/mutex.h>
#include <linux/pci.h>
#include <linux/pci_hotplug.h>
#include <asm/uaccess.h>
#include "../pci.h"

#define MY_NAME	"pci_hotplug"

#define dbg(fmt, arg...) do { if (debug) printk(KERN_DEBUG "%s: %s: " fmt , MY_NAME , __func__ , ## arg); } while (0)
#define err(format, arg...) printk(KERN_ERR "%s: " format , MY_NAME , ## arg)
#define info(format, arg...) printk(KERN_INFO "%s: " format , MY_NAME , ## arg)
#define warn(format, arg...) printk(KERN_WARNING "%s: " format , MY_NAME , ## arg)


/* local variables */
static int debug;

#define DRIVER_VERSION	"0.5"
#define DRIVER_AUTHOR	"Greg Kroah-Hartman <[e-mail]>, Scott Murray <[e-mail]>"
#define DRIVER_DESC	"PCI Hot Plug PCI Core"


//////////////////////////////////////////////////////////////////

static LIST_HEAD(pci_hotplug_slot_list);
static DEFINE_MUTEX(pci_hp_mutex);

/* these strings match up with the values in pci_bus_speed */
static char *pci_bus_speed_strings[] = {
	"33 MHz PCI",		/* 0x00 */
	"66 MHz PCI",		/* 0x01 */
	"66 MHz PCIX", 		/* 0x02 */
	"100 MHz PCIX",		/* 0x03 */
	"133 MHz PCIX",		/* 0x04 */
	NULL,			/* 0x05 */
	NULL,			/* 0x06 */
	NULL,			/* 0x07 */
	NULL,			/* 0x08 */
	"66 MHz PCIX 266",	/* 0x09 */
	"100 MHz PCIX 266",	/* 0x0a */
	"133 MHz PCIX 266",	/* 0x0b */
	NULL,			/* 0x0c */
	NULL,			/* 0x0d */
	NULL,			/* 0x0e */
	NULL,			/* 0x0f */
	NULL,			/* 0x10 */
	"66 MHz PCIX 533",	/* 0x11 */
	"100 MHz PCIX 533",	/* 0x12 */
	"133 MHz PCIX 533",	/* 0x13 */
	"25 GBps PCI-E",	/* 0x14 */
};

#ifdef CONFIG_HOTPLUG_PCI_CPCI
extern int cpci_hotplug_init(int debug);
extern void cpci_hotplug_exit(void);
#else
static inline int cpci_hotplug_init(int debug) { return 0; }
static inline void cpci_hotplug_exit(void) { }
#endif

/* Weee, fun with macros... */
#define GET_STATUS(name,type)	\
static int get_##name (struct hotplug_slot *slot, type *value)		\
{									\
	struct hotplug_slot_ops *ops = slot->ops;			\
	int retval = 0;							\
	if (try_module_get(ops->owner)) {				\
		if (ops->get_##name)					\
			retval = ops->get_##name(slot, value);		\
		else							\
			*value = slot->info->name;			\
		module_put(ops->owner);					\
	}								\
	return retval;							\
}

GET_STATUS(power_status, u8)
GET_STATUS(attention_status, u8)
GET_STATUS(latch_status, u8)
GET_STATUS(adapter_status, u8)
GET_STATUS(max_bus_speed, enum pci_bus_speed)
GET_STATUS(cur_bus_speed, enum pci_bus_speed)

static ssize_t power_read_file(struct pci_slot *slot, char *buf)
{
	int retval;
	u8 value;

	retval = get_power_status(slot->hotplug, &value);
	if (retval)
		goto exit;
	retval = sprintf (buf, "%d\n", value);
exit:
	return retval;
}

static ssize_t power_write_file(struct pci_slot *pci_slot, const char *buf,
		size_t count)
{
	struct hotplug_slot *slot = pci_slot->hotplug;
	unsigned long lpower;
	u8 power;
	int retval = 0;

	lpower = simple_strtoul (buf, NULL, 10);
	power = (u8)(lpower & 0xff);
	dbg ("power = %d\n", power);

	if (!try_module_get(slot->ops->owner)) {
		retval = -ENODEV;
		goto exit;
	}
	switch (power) {
		case 0:
			if (slot->ops->disable_slot)
				retval = slot->ops->disable_slot(slot);
			break;

		case 1:
			if (slot->ops->enable_slot)
				retval = slot->ops->enable_slot(slot);
			break;

		default:
			err ("Illegal value specified for power\n");
			retval = -EINVAL;
	}
	module_put(slot->ops->owner);

exit:	
	if (retval)
		return retval;
	return count;
}

static struct pci_slot_attribute hotplug_slot_attr_power = {
	.attr = {.name = "power", .mode = S_IFREG | S_IRUGO | S_IWUSR},
	.show = power_read_file,
	.store = power_write_file
};

static ssize_t attention_read_file(struct pci_slot *slot, char *buf)
{
	int retval;
	u8 value;

	retval = get_attention_status(slot->hotplug, &value);
	if (retval)
		goto exit;
	retval = sprintf(buf, "%d\n", value);

exit:
	return retval;
}

static ssize_t attention_write_file(struct pci_slot *slot, const char *buf,
		size_t count)
{
	struct hotplug_slot_ops *ops = slot->hotplug->ops;
	unsigned long lattention;
	u8 attention;
	int retval = 0;

	lattention = simple_strtoul (buf, NULL, 10);
	attention = (u8)(lattention & 0xff);
	dbg (" - attention = %d\n", attention);

	if (!try_module_get(ops->owner)) {
		retval = -ENODEV;
		goto exit;
	}
	if (ops->set_attention_status)
		retval = ops->set_attention_status(slot->hotplug, attention);
	module_put(ops->owner);

exit:	
	if (retval)
		return retval;
	return count;
}

static struct pci_slot_attribute hotplug_slot_attr_attention = {
	.attr = {.name = "attention", .mode = S_IFREG | S_IRUGO | S_IWUSR},
	.show = attention_read_file,
	.store = attention_write_file
};

static ssize_t latch_read_file(struct pci_slot *slot, char *buf)
{
	int retval;
	u8 value;

	retval = get_latch_status(slot->hotplug, &value);
	if (retval)
		goto exit;
	retval = sprintf (buf, "%d\n", value);

exit:
	return retval;
}

static struct pci_slot_attribute hotplug_slot_attr_latch = {
	.attr = {.name = "latch", .mode = S_IFREG | S_IRUGO},
	.show = latch_read_file,
};

static ssize_t presence_read_file(struct pci_slot *slot, char *buf)
{
	int retval;
	u8 value;

	retval = get_adapter_status(slot->hotplug, &value);
	if (retval)
		goto exit;
	retval = sprintf (buf, "%d\n", value);

exit:
	return retval;
}

static struct pci_slot_attribute hotplug_slot_attr_presence = {
	.attr = {.name = "adapter", .mode = S_IFREG | S_IRUGO},
	.show = presence_read_file,
};

static char *unknown_speed = "Unknown bus speed";

static ssize_t max_bus_speed_read_file(struct pci_slot *slot, char *buf)
{
	char *speed_string;
	int retval;
	enum pci_bus_speed value;
	
	retval = get_max_bus_speed(slot->hotplug, &value);
	if (retval)
		goto exit;

	if (value == PCI_SPEED_UNKNOWN)
		speed_string = unknown_speed;
	else
		speed_string = pci_bus_speed_strings[value];
	
	retval = sprintf (buf, "%s\n", speed_string);

exit:
	return retval;
}

static struct pci_slot_attribute hotplug_slot_attr_max_bus_speed = {
	.attr = {.name = "max_bus_speed", .mode = S_IFREG | S_IRUGO},
	.show = max_bus_speed_read_file,
};

static ssize_t cur_bus_speed_read_file(struct pci_slot *slot, char *buf)
{
	char *speed_string;
	int retval;
	enum pci_bus_speed value;

	retval = get_cur_bus_speed(slot->hotplug, &value);
	if (retval)
		goto exit;

	if (value == PCI_SPEED_UNKNOWN)
		speed_string = unknown_speed;
	else
		speed_string = pci_bus_speed_strings[value];
	
	retval = sprintf (buf, "%s\n", speed_string);

exit:
	return retval;
}

static struct pci_slot_attribute hotplug_slot_attr_cur_bus_speed = {
	.attr = {.name = "cur_bus_speed", .mode = S_IFREG | S_IRUGO},
	.show = cur_bus_speed_read_file,
};

static ssize_t test_write_file(struct pci_slot *pci_slot, const char *buf,
		size_t count)
{
	struct hotplug_slot *slot = pci_slot->hotplug;
	unsigned long ltest;
	u32 test;
	int retval = 0;

	ltest = simple_strtoul (buf, NULL, 10);
	test = (u32)(ltest & 0xffffffff);
	dbg ("test = %d\n", test);

	if (!try_module_get(slot->ops->owner)) {
		retval = -ENODEV;
		goto exit;
	}
	if (slot->ops->hardware_test)
		retval = slot->ops->hardware_test(slot, test);
	module_put(slot->ops->owner);

exit:	
	if (retval)
		return retval;
	return count;
}

static struct pci_slot_attribute hotplug_slot_attr_test = {