+++ /dev/null
-/*!
-
- \file smschar.c
-
- \brief Implementation of smscore client for cdev based access
-
- \par Copyright (c), 2005-2008 Siano Mobile Silicon, Inc.
-
- \par This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License version 3 as
- published by the Free Software Foundation;
-
- Software distributed under the License is distributed on an "AS
- IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
- implied.
-
- \author Anatoly Greenblat
-
-*/
-
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/init.h>
-
-#include <linux/kernel.h> /* printk() */
-#include <linux/fs.h> /* everything... */
-#include <linux/types.h> /* size_t */
-#include <linux/cdev.h>
-#include <linux/sched.h>
-#include <asm/system.h> /* cli(), *_flags */
-#include <asm/uaccess.h> /* copy_*_user */
-
-#include "smskdefs.h" // page, scatterlist, kmutex
-#include "smscoreapi.h"
-#include "smstypes.h"
-
-#include "smscharioctl.h"
-
-#define SMS_CHR_MAX_Q_LEN 10 // max number of packets allowed to be pending on queue
-#define SMSCHAR_NR_DEVS 7
-
-typedef struct _smschar_device
-{
- struct cdev cdev; //!< Char device structure - kernel's device model representation
-
- wait_queue_head_t waitq; /* Processes waiting */
- spinlock_t lock; //!< critical section
- int pending_count;
- struct list_head pending_data; //!< list of pending data
-
- smscore_buffer_t *currentcb;
-
- int device_index;
-
- smscore_device_t *coredev;
- smscore_client_t *smsclient;
-} smschar_device_t;
-
-//! Holds the major number of the device node. may be changed at load time.
-int smschar_major = 251;
-
-//! Holds the first minor number of the device node. may be changed at load time.
-int smschar_minor = 0;
-
-// macros that allow the load time parameters change
-module_param ( smschar_major, int, S_IRUGO );
-module_param ( smschar_minor, int, S_IRUGO );
-
-#ifdef SMSCHAR_DEBUG
-
- #undef PERROR
-# define PERROR(fmt, args...) printk( KERN_INFO "smschar error: line %d- %s(): " fmt,__LINE__, __FUNCTION__, ## args)
- #undef PWARNING
-# define PWARNING(fmt, args...) printk( KERN_INFO "smschar warning: line %d- %s(): " fmt,__LINE__, __FUNCTION__, ## args)
- #undef PDEBUG /* undef it, just in case */
-# define PDEBUG(fmt, args...) printk( KERN_INFO "smschar - %s(): " fmt, __FUNCTION__, ## args)
-
-#else /* not debugging: nothing */
-
- #define PDEBUG(fmt, args...)
- #define PERROR(fmt, args...)
- #define PWARNING(fmt, args...)
-
-#endif
-
-smschar_device_t smschar_devices[SMSCHAR_NR_DEVS];
-static int g_smschar_inuse = 0;
-
-/**
- * unregisters sms client and returns all queued buffers
- *
- * @param dev pointer to the client context (smschar parameters block)
- *
- */
-void smschar_unregister_client(smschar_device_t* dev)
-{
- unsigned long flags;
-
- if (dev->coredev && dev->smsclient)
- {
- wake_up_interruptible(&dev->waitq);
-
- spin_lock_irqsave(&dev->lock, flags);
-
- while (!list_empty(&dev->pending_data))
- {
- smscore_buffer_t *cb = (smscore_buffer_t *) dev->pending_data.next;
- list_del(&cb->entry);
-
- smscore_putbuffer(dev->coredev, cb);
-
- dev->pending_count --;
- }
-
- if (dev->currentcb)
- {
- smscore_putbuffer(dev->coredev, dev->currentcb);
- dev->currentcb = NULL;
- dev->pending_count --;
- }
-
- smscore_unregister_client(dev->smsclient);
- dev->smsclient = NULL;
-
- spin_unlock_irqrestore(&dev->lock, flags);
- }
-}
-
-/**
- * queues incoming buffers into buffers queue
- *
- * @param context pointer to the client context (smschar parameters block)
- * @param cb pointer to incoming buffer descriptor
- *
- * @return 0 on success, <0 on queue overflow.
- */
-int smschar_onresponse(void *context, smscore_buffer_t *cb)
-{
- smschar_device_t *dev = context;
- unsigned long flags;
-
- spin_lock_irqsave(&dev->lock, flags);
-
- if (dev->pending_count > SMS_CHR_MAX_Q_LEN)
- {
- spin_unlock_irqrestore(&dev->lock, flags);
- return -EBUSY;
- }
-
- dev->pending_count ++;
-
- // if data channel, remove header
- if (dev->device_index)
- {
- cb->size -= sizeof(SmsMsgHdr_ST);
- cb->offset += sizeof(SmsMsgHdr_ST);
- }
-
- list_add_tail(&cb->entry, &dev->pending_data);
- spin_unlock_irqrestore(&dev->lock, flags);
-
- if (waitqueue_active(&dev->waitq))
- wake_up_interruptible(&dev->waitq);
-
- return 0;
-}
-
-/**
- * handles device removal event
- *
- * @param context pointer to the client context (smschar parameters block)
- *
- */
-void smschar_onremove(void *context)
-{
- smschar_device_t *dev = (smschar_device_t *) context;
-
- smschar_unregister_client(dev);
- dev->coredev = NULL;
-}
-
-/**
- * registers client associated with the node
- *
- * @param inode Inode concerned.
- * @param file File concerned.
- *
- * @return 0 on success, <0 on error.
- */
-int smschar_open (struct inode *inode, struct file *file)
-{
- smschar_device_t *dev = container_of(inode->i_cdev, smschar_device_t, cdev);
- int rc = -ENODEV;
-
- PDEBUG("entering index %d\n", dev->device_index);
-
- if (dev->coredev)
- {
- smsclient_params_t params;
-
- params.initial_id = dev->device_index ? dev->device_index : SMS_HOST_LIB;
- params.data_type = dev->device_index ? MSG_SMS_DAB_CHANNEL : 0;
- params.onresponse_handler = smschar_onresponse;
- params.onremove_handler = smschar_onremove;
- params.context = dev;
-
- rc = smscore_register_client(dev->coredev, ¶ms, &dev->smsclient);
- if (!rc)
- {
- file->private_data = dev;
- }
- }
-
- PDEBUG("exiting, rc %d\n", rc);
-
- return rc;
-}
-
-/**
- * unregisters client associated with the node
- *
- * @param inode Inode concerned.
- * @param file File concerned.
- *
- */
-int smschar_release(struct inode *inode, struct file *file)
-{
- smschar_unregister_client(file->private_data);
-
- PDEBUG("exiting\n");
-
- return 0;
-}
-
-/**
- * copies data from buffers in incoming queue into a user buffer
- *
- * @param file File structure.
- * @param buf Source buffer.
- * @param count Size of source buffer.
- * @param f_pos Position in file (ignored).
- *
- * @return Number of bytes read, or <0 on error.
- */
-ssize_t smschar_read ( struct file * file, char __user * buf, size_t count, loff_t * f_pos )
-{
- smschar_device_t *dev = file->private_data;
- unsigned long flags;
- int copied = 0;
-
- if (!dev->coredev || !dev->smsclient)
- {
- PERROR("no client\n");
- return -ENODEV;
- }
-
- while (copied != count)
- {
- if (0 > wait_event_interruptible(dev->waitq, !list_empty(&dev->pending_data)))
- {
- PERROR("wait_event_interruptible error\n");
- return -ENODEV;
- }
-
- if (!dev->smsclient)
- {
- PERROR("no client\n");
- return -ENODEV;
- }
-
- spin_lock_irqsave(&dev->lock, flags);
-
- while (!list_empty(&dev->pending_data) && (copied != count))
- {
- smscore_buffer_t *cb = (smscore_buffer_t *) dev->pending_data.next;
- int actual_size = min(((int) count - copied), cb->size);
-
- copy_to_user(&buf[copied], &((char*)cb->p)[cb->offset], actual_size);
-
- copied += actual_size;
- cb->offset += actual_size;
- cb->size -= actual_size;
-
- if (!cb->size)
- {
- list_del(&cb->entry);
- smscore_putbuffer(dev->coredev, cb);
-
- dev->pending_count --;
- }
- }
-
- spin_unlock_irqrestore(&dev->lock, flags);
- }
-
- return copied;
-}
-
-/**
- * sends the buffer to the associated device
- *
- * @param file File structure.
- * @param buf Source buffer.
- * @param count Size of source buffer.
- * @param f_pos Position in file (ignored).
- *
- * @return Number of bytes read, or <0 on error.
- */
-ssize_t smschar_write(struct file *file, const char __user *buf, size_t count, loff_t *f_pos)
-{
- smschar_device_t *dev = file->private_data;
- void *buffer;
-
- if (!dev->smsclient)
- {
- PERROR("no client\n");
- return -ENODEV;
- }
-
- buffer = kmalloc(ALIGN(count, SMS_ALLOC_ALIGNMENT) + SMS_DMA_ALIGNMENT, GFP_KERNEL | GFP_DMA);
- if (buffer)
- {
- void *msg_buffer = (void*) SMS_ALIGN_ADDRESS(buffer);
-
- if (!copy_from_user(msg_buffer, buf, count))
- smsclient_sendrequest(dev->smsclient, msg_buffer, count);
- else
- count = 0;
-
- kfree(buffer);
- }
-
- return count;
-}
-
-int smschar_mmap(struct file *file, struct vm_area_struct *vma)
-{
- smschar_device_t *dev = file->private_data;
- return smscore_map_common_buffer(dev->coredev, vma);
-}
-
-/**
- * waits until buffer inserted into a queue. when inserted buffer offset are reported
- * to the calling process. previously reported buffer is returned to smscore pool
- *
- * @param dev pointer to smschar parameters block
- * @param touser pointer to a structure that receives incoming buffer offsets
- *
- * @return 0 on success, <0 on error.
- */
-int smschar_wait_get_buffer(smschar_device_t* dev, smschar_buffer_t* touser)
-{
- unsigned long flags;
- int rc;
-
- spin_lock_irqsave(&dev->lock, flags);
-
- if (dev->currentcb)
- {
- smscore_putbuffer(dev->coredev, dev->currentcb);
- dev->currentcb = NULL;
- dev->pending_count --;
- }
-
- spin_unlock_irqrestore(&dev->lock, flags);
-
- rc = wait_event_interruptible(dev->waitq, !list_empty(&dev->pending_data));
- if (rc < 0)
- {
- PERROR("wait_event_interruptible error\n");
- return rc;
- }
-
- if (!dev->smsclient)
- {
- PERROR("no client\n");
- return -ENODEV;
- }
-
- spin_lock_irqsave(&dev->lock, flags);
-
- if (!list_empty(&dev->pending_data))
- {
- smscore_buffer_t *cb = (smscore_buffer_t *) dev->pending_data.next;
-
- touser->offset = cb->offset_in_common + cb->offset;
- touser->size = cb->size;
-
- list_del(&cb->entry);
-
- dev->currentcb = cb;
- }
- else
- {
- touser->offset = 0;
- touser->size = 0;
- }
-
- spin_unlock_irqrestore(&dev->lock, flags);
-
- return 0;
-}
-
-int smschar_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
-{
- smschar_device_t *dev = file->private_data;
- void __user *up = (void __user *) arg;
-
- if (!dev->coredev || !dev->smsclient)
- {
- PERROR("no client\n");
- return -ENODEV;
- }
-
- switch(cmd)
- {
- case SMSCHAR_SET_DEVICE_MODE:
- return smscore_set_device_mode(dev->coredev, (int) arg);
-
- case SMSCHAR_GET_DEVICE_MODE:
- {
- if (put_user(smscore_get_device_mode(dev->coredev), (int*) up))
- return -EFAULT;
-
- break;
- }
-
- case SMSCHAR_GET_BUFFER_SIZE:
- {
- if (put_user(smscore_get_common_buffer_size(dev->coredev), (int*) up))
- return -EFAULT;
-
- break;
- }
-
- case SMSCHAR_WAIT_GET_BUFFER:
- {
- smschar_buffer_t touser;
- int rc;
-
- rc = smschar_wait_get_buffer(dev, &touser);
- if (rc < 0)
- return rc;
-
- if (copy_to_user(up, &touser, sizeof(smschar_buffer_t)))
- return -EFAULT;
-
- break;
- }
-
- default:
- return -ENOIOCTLCMD;
- }
-
- return 0;
-}
-
-struct file_operations smschar_fops =
-{
- .owner = THIS_MODULE,
- .read = smschar_read,
- .write = smschar_write,
- .open = smschar_open,
- .release = smschar_release,
- .mmap = smschar_mmap,
- .ioctl = smschar_ioctl,
-};
-
-static int smschar_setup_cdev ( smschar_device_t *dev, int index )
-{
- int rc, devno = MKDEV ( smschar_major, smschar_minor + index );
-
- cdev_init ( &dev->cdev, &smschar_fops );
-
- dev->cdev.owner = THIS_MODULE;
- dev->cdev.ops = &smschar_fops;
-
- kobject_set_name(&dev->cdev.kobj, "Siano_sms%d", index);
-
- rc = cdev_add ( &dev->cdev, devno, 1 );
-
- PDEBUG("exiting %p %d, rc %d\n", dev, index, rc);
-
- return rc;
-}
-
-/**
- * smschar callback that called when device plugged in/out. the function
- * register or unregisters char device interface according to plug in/out
- *
- * @param coredev pointer to device that is being plugged in/out
- * @param device pointer to system device object
- * @param arrival 1 on plug-on, 0 othewise
- *
- * @return 0 on success, <0 on error.
- */
-int smschar_hotplug(smscore_device_t* coredev, struct device* device, int arrival)
-{
- int rc = 0, i;
-
- PDEBUG("entering %d\n", arrival);
-
- if (arrival)
- {
- // currently only 1 instance supported
- if (!g_smschar_inuse)
- {
- /* data notification callbacks assignment */
- memset ( smschar_devices, 0, SMSCHAR_NR_DEVS * sizeof ( smschar_device_t ) );
-
- /* Initialize each device. */
- for (i = 0; i < SMSCHAR_NR_DEVS; i++)
- {
- smschar_setup_cdev ( &smschar_devices[i], i );
-
- INIT_LIST_HEAD(&smschar_devices[i].pending_data);
- spin_lock_init(&smschar_devices[i].lock);
- init_waitqueue_head(&smschar_devices[i].waitq);
-
- smschar_devices[i].coredev = coredev;
- smschar_devices[i].device_index = i;
- }
-
- g_smschar_inuse = 1;
- }
- }
- else
- {
- // currently only 1 instance supported
- if (g_smschar_inuse)
- {
- /* Get rid of our char dev entries */
- for(i = 0; i < SMSCHAR_NR_DEVS; i++)
- cdev_del(&smschar_devices[i].cdev);
-
- g_smschar_inuse = 0;
- }
- }
-
- PDEBUG("exiting, rc %d\n", rc);
-
- return rc; /* succeed */
-}
-
-int smschar_initialize(void)
-{
- dev_t devno = MKDEV ( smschar_major, smschar_minor );
- int rc;
-
- if(smschar_major)
- {
- rc = register_chrdev_region ( devno, SMSCHAR_NR_DEVS, "smschar" );
- }
- else
- {
- rc = alloc_chrdev_region ( &devno, smschar_minor, SMSCHAR_NR_DEVS, "smschar" );
- smschar_major = MAJOR ( devno );
- }
-
- if (rc < 0)
- {
- PWARNING ( "smschar: can't get major %d\n", smschar_major );
- return rc;
- }
-
- return smscore_register_hotplug(smschar_hotplug);
-}
-EXPORT_SYMBOL(smschar_initialize);
-
-void smschar_terminate(void)
-{
- dev_t devno = MKDEV ( smschar_major, smschar_minor );
-
- unregister_chrdev_region(devno, SMSCHAR_NR_DEVS);
- smscore_unregister_hotplug(smschar_hotplug);
-}
-EXPORT_SYMBOL(smschar_terminate);
projects / linux-2.6 / commitdiff