297 lines
6.8 KiB
C
297 lines
6.8 KiB
C
/*
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* linux/drivers/mfd/mcp-core.c
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*
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* Copyright (C) 2001 Russell King
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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.
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*
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* Generic MCP (Multimedia Communications Port) layer. All MCP locking
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* is solely held within this file.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/smp.h>
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#include <linux/device.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/mfd/mcp.h>
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#include <mach/dma.h>
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#include <asm/system.h>
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#define to_mcp(d) container_of(d, struct mcp, attached_device)
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#define to_mcp_driver(d) container_of(d, struct mcp_driver, drv)
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static const struct mcp_device_id *mcp_match_id(const struct mcp_device_id *id,
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const char *codec)
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{
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while (id->name[0]) {
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if (strcmp(codec, id->name) == 0)
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return id;
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id++;
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}
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return NULL;
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}
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const struct mcp_device_id *mcp_get_device_id(const struct mcp *mcp)
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{
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const struct mcp_driver *driver =
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to_mcp_driver(mcp->attached_device.driver);
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return mcp_match_id(driver->id_table, mcp->codec);
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}
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EXPORT_SYMBOL(mcp_get_device_id);
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static int mcp_bus_match(struct device *dev, struct device_driver *drv)
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{
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const struct mcp *mcp = to_mcp(dev);
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const struct mcp_driver *driver = to_mcp_driver(drv);
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if (driver->id_table)
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return !!mcp_match_id(driver->id_table, mcp->codec);
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return 0;
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}
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static int mcp_bus_probe(struct device *dev)
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{
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struct mcp *mcp = to_mcp(dev);
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struct mcp_driver *drv = to_mcp_driver(dev->driver);
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return drv->probe(mcp);
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}
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static int mcp_bus_remove(struct device *dev)
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{
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struct mcp *mcp = to_mcp(dev);
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struct mcp_driver *drv = to_mcp_driver(dev->driver);
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drv->remove(mcp);
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return 0;
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}
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static int mcp_bus_suspend(struct device *dev, pm_message_t state)
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{
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struct mcp *mcp = to_mcp(dev);
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int ret = 0;
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if (dev->driver) {
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struct mcp_driver *drv = to_mcp_driver(dev->driver);
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ret = drv->suspend(mcp, state);
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}
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return ret;
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}
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static int mcp_bus_resume(struct device *dev)
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{
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struct mcp *mcp = to_mcp(dev);
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int ret = 0;
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if (dev->driver) {
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struct mcp_driver *drv = to_mcp_driver(dev->driver);
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ret = drv->resume(mcp);
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}
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return ret;
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}
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static int mcp_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
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{
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struct mcp *mcp = to_mcp(dev);
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add_uevent_var(env, "MODALIAS=%s%s", MCP_MODULE_PREFIX, mcp->codec);
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return 0;
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}
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static struct bus_type mcp_bus_type = {
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.name = "mcp",
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.match = mcp_bus_match,
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.uevent = mcp_bus_uevent,
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.probe = mcp_bus_probe,
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.remove = mcp_bus_remove,
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.suspend = mcp_bus_suspend,
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.resume = mcp_bus_resume,
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};
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/**
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* mcp_set_telecom_divisor - set the telecom divisor
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* @mcp: MCP interface structure
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* @div: SIB clock divisor
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*
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* Set the telecom divisor on the MCP interface. The resulting
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* sample rate is SIBCLOCK/div.
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*/
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void mcp_set_telecom_divisor(struct mcp *mcp, unsigned int div)
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{
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spin_lock_irq(&mcp->lock);
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mcp->ops->set_telecom_divisor(mcp, div);
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spin_unlock_irq(&mcp->lock);
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}
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EXPORT_SYMBOL(mcp_set_telecom_divisor);
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/**
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* mcp_set_audio_divisor - set the audio divisor
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* @mcp: MCP interface structure
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* @div: SIB clock divisor
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*
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* Set the audio divisor on the MCP interface.
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*/
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void mcp_set_audio_divisor(struct mcp *mcp, unsigned int div)
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{
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spin_lock_irq(&mcp->lock);
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mcp->ops->set_audio_divisor(mcp, div);
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spin_unlock_irq(&mcp->lock);
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}
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EXPORT_SYMBOL(mcp_set_audio_divisor);
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/**
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* mcp_reg_write - write a device register
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* @mcp: MCP interface structure
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* @reg: 4-bit register index
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* @val: 16-bit data value
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*
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* Write a device register. The MCP interface must be enabled
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* to prevent this function hanging.
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*/
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void mcp_reg_write(struct mcp *mcp, unsigned int reg, unsigned int val)
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{
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unsigned long flags;
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spin_lock_irqsave(&mcp->lock, flags);
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mcp->ops->reg_write(mcp, reg, val);
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spin_unlock_irqrestore(&mcp->lock, flags);
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}
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EXPORT_SYMBOL(mcp_reg_write);
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/**
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* mcp_reg_read - read a device register
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* @mcp: MCP interface structure
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* @reg: 4-bit register index
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*
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* Read a device register and return its value. The MCP interface
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* must be enabled to prevent this function hanging.
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*/
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unsigned int mcp_reg_read(struct mcp *mcp, unsigned int reg)
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{
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unsigned long flags;
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unsigned int val;
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spin_lock_irqsave(&mcp->lock, flags);
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val = mcp->ops->reg_read(mcp, reg);
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spin_unlock_irqrestore(&mcp->lock, flags);
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return val;
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}
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EXPORT_SYMBOL(mcp_reg_read);
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/**
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* mcp_enable - enable the MCP interface
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* @mcp: MCP interface to enable
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*
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* Enable the MCP interface. Each call to mcp_enable will need
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* a corresponding call to mcp_disable to disable the interface.
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*/
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void mcp_enable(struct mcp *mcp)
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{
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spin_lock_irq(&mcp->lock);
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if (mcp->use_count++ == 0)
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mcp->ops->enable(mcp);
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spin_unlock_irq(&mcp->lock);
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}
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EXPORT_SYMBOL(mcp_enable);
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/**
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* mcp_disable - disable the MCP interface
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* @mcp: MCP interface to disable
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*
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* Disable the MCP interface. The MCP interface will only be
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* disabled once the number of calls to mcp_enable matches the
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* number of calls to mcp_disable.
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*/
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void mcp_disable(struct mcp *mcp)
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{
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unsigned long flags;
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spin_lock_irqsave(&mcp->lock, flags);
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if (--mcp->use_count == 0)
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mcp->ops->disable(mcp);
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spin_unlock_irqrestore(&mcp->lock, flags);
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}
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EXPORT_SYMBOL(mcp_disable);
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static void mcp_release(struct device *dev)
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{
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struct mcp *mcp = container_of(dev, struct mcp, attached_device);
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kfree(mcp);
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}
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struct mcp *mcp_host_alloc(struct device *parent, size_t size)
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{
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struct mcp *mcp;
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mcp = kzalloc(sizeof(struct mcp) + size, GFP_KERNEL);
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if (mcp) {
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spin_lock_init(&mcp->lock);
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mcp->attached_device.parent = parent;
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mcp->attached_device.bus = &mcp_bus_type;
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mcp->attached_device.dma_mask = parent->dma_mask;
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mcp->attached_device.release = mcp_release;
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}
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return mcp;
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}
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EXPORT_SYMBOL(mcp_host_alloc);
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int mcp_host_register(struct mcp *mcp, void *pdata)
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{
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if (!mcp->codec)
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return -EINVAL;
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mcp->attached_device.platform_data = pdata;
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dev_set_name(&mcp->attached_device, "mcp0");
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request_module("%s%s", MCP_MODULE_PREFIX, mcp->codec);
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return device_register(&mcp->attached_device);
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}
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EXPORT_SYMBOL(mcp_host_register);
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void mcp_host_unregister(struct mcp *mcp)
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{
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device_unregister(&mcp->attached_device);
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}
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EXPORT_SYMBOL(mcp_host_unregister);
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int mcp_driver_register(struct mcp_driver *mcpdrv)
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{
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mcpdrv->drv.bus = &mcp_bus_type;
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return driver_register(&mcpdrv->drv);
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}
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EXPORT_SYMBOL(mcp_driver_register);
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void mcp_driver_unregister(struct mcp_driver *mcpdrv)
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{
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driver_unregister(&mcpdrv->drv);
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}
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EXPORT_SYMBOL(mcp_driver_unregister);
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static int __init mcp_init(void)
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{
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return bus_register(&mcp_bus_type);
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}
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static void __exit mcp_exit(void)
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{
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bus_unregister(&mcp_bus_type);
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}
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module_init(mcp_init);
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module_exit(mcp_exit);
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MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
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MODULE_DESCRIPTION("Core multimedia communications port driver");
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MODULE_LICENSE("GPL");
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