240 lines
5.6 KiB
C
240 lines
5.6 KiB
C
/*
|
|
* linux/drivers/mfd/mcp-core.c
|
|
*
|
|
* Copyright (C) 2001 Russell King
|
|
*
|
|
* 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.
|
|
*
|
|
* Generic MCP (Multimedia Communications Port) layer. All MCP locking
|
|
* is solely held within this file.
|
|
*/
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/device.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/string.h>
|
|
#include <linux/mfd/mcp.h>
|
|
|
|
|
|
#define to_mcp(d) container_of(d, struct mcp, attached_device)
|
|
#define to_mcp_driver(d) container_of(d, struct mcp_driver, drv)
|
|
|
|
static int mcp_bus_match(struct device *dev, struct device_driver *drv)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static int mcp_bus_probe(struct device *dev)
|
|
{
|
|
struct mcp *mcp = to_mcp(dev);
|
|
struct mcp_driver *drv = to_mcp_driver(dev->driver);
|
|
|
|
return drv->probe(mcp);
|
|
}
|
|
|
|
static int mcp_bus_remove(struct device *dev)
|
|
{
|
|
struct mcp *mcp = to_mcp(dev);
|
|
struct mcp_driver *drv = to_mcp_driver(dev->driver);
|
|
|
|
drv->remove(mcp);
|
|
return 0;
|
|
}
|
|
|
|
static struct bus_type mcp_bus_type = {
|
|
.name = "mcp",
|
|
.match = mcp_bus_match,
|
|
.probe = mcp_bus_probe,
|
|
.remove = mcp_bus_remove,
|
|
};
|
|
|
|
/**
|
|
* mcp_set_telecom_divisor - set the telecom divisor
|
|
* @mcp: MCP interface structure
|
|
* @div: SIB clock divisor
|
|
*
|
|
* Set the telecom divisor on the MCP interface. The resulting
|
|
* sample rate is SIBCLOCK/div.
|
|
*/
|
|
void mcp_set_telecom_divisor(struct mcp *mcp, unsigned int div)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&mcp->lock, flags);
|
|
mcp->ops->set_telecom_divisor(mcp, div);
|
|
spin_unlock_irqrestore(&mcp->lock, flags);
|
|
}
|
|
EXPORT_SYMBOL(mcp_set_telecom_divisor);
|
|
|
|
/**
|
|
* mcp_set_audio_divisor - set the audio divisor
|
|
* @mcp: MCP interface structure
|
|
* @div: SIB clock divisor
|
|
*
|
|
* Set the audio divisor on the MCP interface.
|
|
*/
|
|
void mcp_set_audio_divisor(struct mcp *mcp, unsigned int div)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&mcp->lock, flags);
|
|
mcp->ops->set_audio_divisor(mcp, div);
|
|
spin_unlock_irqrestore(&mcp->lock, flags);
|
|
}
|
|
EXPORT_SYMBOL(mcp_set_audio_divisor);
|
|
|
|
/**
|
|
* mcp_reg_write - write a device register
|
|
* @mcp: MCP interface structure
|
|
* @reg: 4-bit register index
|
|
* @val: 16-bit data value
|
|
*
|
|
* Write a device register. The MCP interface must be enabled
|
|
* to prevent this function hanging.
|
|
*/
|
|
void mcp_reg_write(struct mcp *mcp, unsigned int reg, unsigned int val)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&mcp->lock, flags);
|
|
mcp->ops->reg_write(mcp, reg, val);
|
|
spin_unlock_irqrestore(&mcp->lock, flags);
|
|
}
|
|
EXPORT_SYMBOL(mcp_reg_write);
|
|
|
|
/**
|
|
* mcp_reg_read - read a device register
|
|
* @mcp: MCP interface structure
|
|
* @reg: 4-bit register index
|
|
*
|
|
* Read a device register and return its value. The MCP interface
|
|
* must be enabled to prevent this function hanging.
|
|
*/
|
|
unsigned int mcp_reg_read(struct mcp *mcp, unsigned int reg)
|
|
{
|
|
unsigned long flags;
|
|
unsigned int val;
|
|
|
|
spin_lock_irqsave(&mcp->lock, flags);
|
|
val = mcp->ops->reg_read(mcp, reg);
|
|
spin_unlock_irqrestore(&mcp->lock, flags);
|
|
|
|
return val;
|
|
}
|
|
EXPORT_SYMBOL(mcp_reg_read);
|
|
|
|
/**
|
|
* mcp_enable - enable the MCP interface
|
|
* @mcp: MCP interface to enable
|
|
*
|
|
* Enable the MCP interface. Each call to mcp_enable will need
|
|
* a corresponding call to mcp_disable to disable the interface.
|
|
*/
|
|
void mcp_enable(struct mcp *mcp)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&mcp->lock, flags);
|
|
if (mcp->use_count++ == 0)
|
|
mcp->ops->enable(mcp);
|
|
spin_unlock_irqrestore(&mcp->lock, flags);
|
|
}
|
|
EXPORT_SYMBOL(mcp_enable);
|
|
|
|
/**
|
|
* mcp_disable - disable the MCP interface
|
|
* @mcp: MCP interface to disable
|
|
*
|
|
* Disable the MCP interface. The MCP interface will only be
|
|
* disabled once the number of calls to mcp_enable matches the
|
|
* number of calls to mcp_disable.
|
|
*/
|
|
void mcp_disable(struct mcp *mcp)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&mcp->lock, flags);
|
|
if (--mcp->use_count == 0)
|
|
mcp->ops->disable(mcp);
|
|
spin_unlock_irqrestore(&mcp->lock, flags);
|
|
}
|
|
EXPORT_SYMBOL(mcp_disable);
|
|
|
|
static void mcp_release(struct device *dev)
|
|
{
|
|
struct mcp *mcp = container_of(dev, struct mcp, attached_device);
|
|
|
|
kfree(mcp);
|
|
}
|
|
|
|
struct mcp *mcp_host_alloc(struct device *parent, size_t size)
|
|
{
|
|
struct mcp *mcp;
|
|
|
|
mcp = kzalloc(sizeof(struct mcp) + size, GFP_KERNEL);
|
|
if (mcp) {
|
|
spin_lock_init(&mcp->lock);
|
|
device_initialize(&mcp->attached_device);
|
|
mcp->attached_device.parent = parent;
|
|
mcp->attached_device.bus = &mcp_bus_type;
|
|
mcp->attached_device.dma_mask = parent->dma_mask;
|
|
mcp->attached_device.release = mcp_release;
|
|
}
|
|
return mcp;
|
|
}
|
|
EXPORT_SYMBOL(mcp_host_alloc);
|
|
|
|
int mcp_host_add(struct mcp *mcp, void *pdata)
|
|
{
|
|
mcp->attached_device.platform_data = pdata;
|
|
dev_set_name(&mcp->attached_device, "mcp0");
|
|
return device_add(&mcp->attached_device);
|
|
}
|
|
EXPORT_SYMBOL(mcp_host_add);
|
|
|
|
void mcp_host_del(struct mcp *mcp)
|
|
{
|
|
device_del(&mcp->attached_device);
|
|
}
|
|
EXPORT_SYMBOL(mcp_host_del);
|
|
|
|
void mcp_host_free(struct mcp *mcp)
|
|
{
|
|
put_device(&mcp->attached_device);
|
|
}
|
|
EXPORT_SYMBOL(mcp_host_free);
|
|
|
|
int mcp_driver_register(struct mcp_driver *mcpdrv)
|
|
{
|
|
mcpdrv->drv.bus = &mcp_bus_type;
|
|
return driver_register(&mcpdrv->drv);
|
|
}
|
|
EXPORT_SYMBOL(mcp_driver_register);
|
|
|
|
void mcp_driver_unregister(struct mcp_driver *mcpdrv)
|
|
{
|
|
driver_unregister(&mcpdrv->drv);
|
|
}
|
|
EXPORT_SYMBOL(mcp_driver_unregister);
|
|
|
|
static int __init mcp_init(void)
|
|
{
|
|
return bus_register(&mcp_bus_type);
|
|
}
|
|
|
|
static void __exit mcp_exit(void)
|
|
{
|
|
bus_unregister(&mcp_bus_type);
|
|
}
|
|
|
|
module_init(mcp_init);
|
|
module_exit(mcp_exit);
|
|
|
|
MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
|
|
MODULE_DESCRIPTION("Core multimedia communications port driver");
|
|
MODULE_LICENSE("GPL");
|