+++ /dev/null
-/* -----------------------------------------------------------------------------
- * Copyright (c) 2011 Ozmo Inc
- * Released under the GNU General Public License Version 2 (GPLv2).
- * -----------------------------------------------------------------------------
- */
-#include <linux/module.h>
-#include <linux/fs.h>
-#include <linux/cdev.h>
-#include <linux/uaccess.h>
-#include <linux/netdevice.h>
-#include <linux/etherdevice.h>
-#include <linux/poll.h>
-#include <linux/sched.h>
-#include "ozdbg.h"
-#include "ozprotocol.h"
-#include "ozappif.h"
-#include "ozeltbuf.h"
-#include "ozpd.h"
-#include "ozproto.h"
-#include "ozcdev.h"
-
-#define OZ_RD_BUF_SZ 256
-struct oz_cdev {
- dev_t devnum;
- struct cdev cdev;
- wait_queue_head_t rdq;
- spinlock_t lock;
- u8 active_addr[ETH_ALEN];
- struct oz_pd *active_pd;
-};
-
-/* Per PD context for the serial service stored in the PD. */
-struct oz_serial_ctx {
- atomic_t ref_count;
- u8 tx_seq_num;
- u8 rx_seq_num;
- u8 rd_buf[OZ_RD_BUF_SZ];
- int rd_in;
- int rd_out;
-};
-
-static struct oz_cdev g_cdev;
-static struct class *g_oz_class;
-
-/*
- * Context: process and softirq
- */
-static struct oz_serial_ctx *oz_cdev_claim_ctx(struct oz_pd *pd)
-{
- struct oz_serial_ctx *ctx;
-
- spin_lock_bh(&pd->app_lock[OZ_APPID_SERIAL]);
- ctx = (struct oz_serial_ctx *) pd->app_ctx[OZ_APPID_SERIAL];
- if (ctx)
- atomic_inc(&ctx->ref_count);
- spin_unlock_bh(&pd->app_lock[OZ_APPID_SERIAL]);
- return ctx;
-}
-
-/*
- * Context: softirq or process
- */
-static void oz_cdev_release_ctx(struct oz_serial_ctx *ctx)
-{
- if (atomic_dec_and_test(&ctx->ref_count)) {
- oz_dbg(ON, "Dealloc serial context\n");
- kfree(ctx);
- }
-}
-
-/*
- * Context: process
- */
-static int oz_cdev_open(struct inode *inode, struct file *filp)
-{
- struct oz_cdev *dev = container_of(inode->i_cdev, struct oz_cdev, cdev);
-
- oz_dbg(ON, "major = %d minor = %d\n", imajor(inode), iminor(inode));
-
- filp->private_data = dev;
- return 0;
-}
-
-/*
- * Context: process
- */
-static int oz_cdev_release(struct inode *inode, struct file *filp)
-{
- return 0;
-}
-
-/*
- * Context: process
- */
-static ssize_t oz_cdev_read(struct file *filp, char __user *buf, size_t count,
- loff_t *fpos)
-{
- int n;
- int ix;
-
- struct oz_pd *pd;
- struct oz_serial_ctx *ctx;
-
- spin_lock_bh(&g_cdev.lock);
- pd = g_cdev.active_pd;
- if (pd)
- oz_pd_get(pd);
- spin_unlock_bh(&g_cdev.lock);
- if (pd == NULL)
- return -1;
- ctx = oz_cdev_claim_ctx(pd);
- if (ctx == NULL)
- goto out2;
- n = ctx->rd_in - ctx->rd_out;
- if (n < 0)
- n += OZ_RD_BUF_SZ;
- if (count > n)
- count = n;
- ix = ctx->rd_out;
- n = OZ_RD_BUF_SZ - ix;
- if (n > count)
- n = count;
- if (copy_to_user(buf, &ctx->rd_buf[ix], n)) {
- count = 0;
- goto out1;
- }
- ix += n;
- if (ix == OZ_RD_BUF_SZ)
- ix = 0;
- if (n < count) {
- if (copy_to_user(&buf[n], ctx->rd_buf, count-n)) {
- count = 0;
- goto out1;
- }
- ix = count-n;
- }
- ctx->rd_out = ix;
-out1:
- oz_cdev_release_ctx(ctx);
-out2:
- oz_pd_put(pd);
- return count;
-}
-
-/*
- * Context: process
- */
-static ssize_t oz_cdev_write(struct file *filp, const char __user *buf,
- size_t count, loff_t *fpos)
-{
- struct oz_pd *pd;
- struct oz_elt_buf *eb;
- struct oz_elt_info *ei;
- struct oz_elt *elt;
- struct oz_app_hdr *app_hdr;
- struct oz_serial_ctx *ctx;
-
- if (count > sizeof(ei->data) - sizeof(*elt) - sizeof(*app_hdr))
- return -EINVAL;
-
- spin_lock_bh(&g_cdev.lock);
- pd = g_cdev.active_pd;
- if (pd)
- oz_pd_get(pd);
- spin_unlock_bh(&g_cdev.lock);
- if (pd == NULL)
- return -ENXIO;
- if (!(pd->state & OZ_PD_S_CONNECTED))
- return -EAGAIN;
- eb = &pd->elt_buff;
- ei = oz_elt_info_alloc(eb);
- if (ei == NULL) {
- count = 0;
- goto out;
- }
- elt = (struct oz_elt *)ei->data;
- app_hdr = (struct oz_app_hdr *)(elt+1);
- elt->length = sizeof(struct oz_app_hdr) + count;
- elt->type = OZ_ELT_APP_DATA;
- ei->app_id = OZ_APPID_SERIAL;
- ei->length = elt->length + sizeof(struct oz_elt);
- app_hdr->app_id = OZ_APPID_SERIAL;
- if (copy_from_user(app_hdr+1, buf, count))
- goto out;
- spin_lock_bh(&pd->app_lock[OZ_APPID_USB]);
- ctx = (struct oz_serial_ctx *) pd->app_ctx[OZ_APPID_SERIAL];
- if (ctx) {
- app_hdr->elt_seq_num = ctx->tx_seq_num++;
- if (ctx->tx_seq_num == 0)
- ctx->tx_seq_num = 1;
- spin_lock(&eb->lock);
- if (oz_queue_elt_info(eb, 0, 0, ei) == 0)
- ei = NULL;
- spin_unlock(&eb->lock);
- }
- spin_unlock_bh(&pd->app_lock[OZ_APPID_USB]);
-out:
- if (ei) {
- count = 0;
- spin_lock_bh(&eb->lock);
- oz_elt_info_free(eb, ei);
- spin_unlock_bh(&eb->lock);
- }
- oz_pd_put(pd);
- return count;
-}
-
-/*
- * Context: process
- */
-static int oz_set_active_pd(const u8 *addr)
-{
- int rc = 0;
- struct oz_pd *pd;
- struct oz_pd *old_pd;
-
- pd = oz_pd_find(addr);
- if (pd) {
- spin_lock_bh(&g_cdev.lock);
- ether_addr_copy(g_cdev.active_addr, addr);
- old_pd = g_cdev.active_pd;
- g_cdev.active_pd = pd;
- spin_unlock_bh(&g_cdev.lock);
- if (old_pd)
- oz_pd_put(old_pd);
- } else {
- if (is_zero_ether_addr(addr)) {
- spin_lock_bh(&g_cdev.lock);
- pd = g_cdev.active_pd;
- g_cdev.active_pd = NULL;
- memset(g_cdev.active_addr, 0,
- sizeof(g_cdev.active_addr));
- spin_unlock_bh(&g_cdev.lock);
- if (pd)
- oz_pd_put(pd);
- } else {
- rc = -1;
- }
- }
- return rc;
-}
-
-/*
- * Context: process
- */
-static long oz_cdev_ioctl(struct file *filp, unsigned int cmd,
- unsigned long arg)
-{
- int rc = 0;
-
- if (_IOC_TYPE(cmd) != OZ_IOCTL_MAGIC)
- return -ENOTTY;
- if (_IOC_NR(cmd) > OZ_IOCTL_MAX)
- return -ENOTTY;
- if (_IOC_DIR(cmd) & _IOC_READ)
- rc = !access_ok(VERIFY_WRITE, (void __user *)arg,
- _IOC_SIZE(cmd));
- else if (_IOC_DIR(cmd) & _IOC_WRITE)
- rc = !access_ok(VERIFY_READ, (void __user *)arg,
- _IOC_SIZE(cmd));
- if (rc)
- return -EFAULT;
- switch (cmd) {
- case OZ_IOCTL_GET_PD_LIST: {
- struct oz_pd_list list;
-
- oz_dbg(ON, "OZ_IOCTL_GET_PD_LIST\n");
- memset(&list, 0, sizeof(list));
- list.count = oz_get_pd_list(list.addr, OZ_MAX_PDS);
- if (copy_to_user((void __user *)arg, &list,
- sizeof(list)))
- return -EFAULT;
- }
- break;
- case OZ_IOCTL_SET_ACTIVE_PD: {
- u8 addr[ETH_ALEN];
-
- oz_dbg(ON, "OZ_IOCTL_SET_ACTIVE_PD\n");
- if (copy_from_user(addr, (void __user *)arg, ETH_ALEN))
- return -EFAULT;
- rc = oz_set_active_pd(addr);
- }
- break;
- case OZ_IOCTL_GET_ACTIVE_PD: {
- u8 addr[ETH_ALEN];
-
- oz_dbg(ON, "OZ_IOCTL_GET_ACTIVE_PD\n");
- spin_lock_bh(&g_cdev.lock);
- ether_addr_copy(addr, g_cdev.active_addr);
- spin_unlock_bh(&g_cdev.lock);
- if (copy_to_user((void __user *)arg, addr, ETH_ALEN))
- return -EFAULT;
- }
- break;
- case OZ_IOCTL_ADD_BINDING:
- case OZ_IOCTL_REMOVE_BINDING: {
- struct oz_binding_info b;
-
- if (copy_from_user(&b, (void __user *)arg,
- sizeof(struct oz_binding_info))) {
- return -EFAULT;
- }
- /* Make sure name is null terminated. */
- b.name[OZ_MAX_BINDING_LEN-1] = 0;
- if (cmd == OZ_IOCTL_ADD_BINDING)
- oz_binding_add(b.name);
- else
- oz_binding_remove(b.name);
- }
- break;
- }
- return rc;
-}
-
-/*
- * Context: process
- */
-static unsigned int oz_cdev_poll(struct file *filp, poll_table *wait)
-{
- unsigned int ret = 0;
- struct oz_cdev *dev = filp->private_data;
-
- oz_dbg(ON, "Poll called wait = %p\n", wait);
- spin_lock_bh(&dev->lock);
- if (dev->active_pd) {
- struct oz_serial_ctx *ctx = oz_cdev_claim_ctx(dev->active_pd);
-
- if (ctx) {
- if (ctx->rd_in != ctx->rd_out)
- ret |= POLLIN | POLLRDNORM;
- oz_cdev_release_ctx(ctx);
- }
- }
- spin_unlock_bh(&dev->lock);
- if (wait)
- poll_wait(filp, &dev->rdq, wait);
- return ret;
-}
-
-/*
- */
-static const struct file_operations oz_fops = {
- .owner = THIS_MODULE,
- .open = oz_cdev_open,
- .release = oz_cdev_release,
- .read = oz_cdev_read,
- .write = oz_cdev_write,
- .unlocked_ioctl = oz_cdev_ioctl,
- .poll = oz_cdev_poll
-};
-
-/*
- * Context: process
- */
-int oz_cdev_register(void)
-{
- int err;
- struct device *dev;
-
- memset(&g_cdev, 0, sizeof(g_cdev));
- err = alloc_chrdev_region(&g_cdev.devnum, 0, 1, "ozwpan");
- if (err < 0)
- return err;
- oz_dbg(ON, "Alloc dev number %d:%d\n",
- MAJOR(g_cdev.devnum), MINOR(g_cdev.devnum));
- cdev_init(&g_cdev.cdev, &oz_fops);
- g_cdev.cdev.owner = THIS_MODULE;
- spin_lock_init(&g_cdev.lock);
- init_waitqueue_head(&g_cdev.rdq);
- err = cdev_add(&g_cdev.cdev, g_cdev.devnum, 1);
- if (err < 0) {
- oz_dbg(ON, "Failed to add cdev\n");
- goto unregister;
- }
- g_oz_class = class_create(THIS_MODULE, "ozmo_wpan");
- if (IS_ERR(g_oz_class)) {
- oz_dbg(ON, "Failed to register ozmo_wpan class\n");
- err = PTR_ERR(g_oz_class);
- goto delete;
- }
- dev = device_create(g_oz_class, NULL, g_cdev.devnum, NULL, "ozwpan");
- if (IS_ERR(dev)) {
- oz_dbg(ON, "Failed to create sysfs entry for cdev\n");
- err = PTR_ERR(dev);
- goto delete;
- }
- return 0;
-
-delete:
- cdev_del(&g_cdev.cdev);
-unregister:
- unregister_chrdev_region(g_cdev.devnum, 1);
- return err;
-}
-
-/*
- * Context: process
- */
-int oz_cdev_deregister(void)
-{
- cdev_del(&g_cdev.cdev);
- unregister_chrdev_region(g_cdev.devnum, 1);
- if (g_oz_class) {
- device_destroy(g_oz_class, g_cdev.devnum);
- class_destroy(g_oz_class);
- }
- return 0;
-}
-
-/*
- * Context: process
- */
-int oz_cdev_init(void)
-{
- oz_app_enable(OZ_APPID_SERIAL, 1);
- return 0;
-}
-
-/*
- * Context: process
- */
-void oz_cdev_term(void)
-{
- oz_app_enable(OZ_APPID_SERIAL, 0);
-}
-
-/*
- * Context: softirq-serialized
- */
-int oz_cdev_start(struct oz_pd *pd, int resume)
-{
- struct oz_serial_ctx *ctx;
- struct oz_serial_ctx *old_ctx;
-
- if (resume) {
- oz_dbg(ON, "Serial service resumed\n");
- return 0;
- }
- ctx = kzalloc(sizeof(struct oz_serial_ctx), GFP_ATOMIC);
- if (ctx == NULL)
- return -ENOMEM;
- atomic_set(&ctx->ref_count, 1);
- ctx->tx_seq_num = 1;
- spin_lock_bh(&pd->app_lock[OZ_APPID_SERIAL]);
- old_ctx = pd->app_ctx[OZ_APPID_SERIAL];
- if (old_ctx) {
- spin_unlock_bh(&pd->app_lock[OZ_APPID_SERIAL]);
- kfree(ctx);
- } else {
- pd->app_ctx[OZ_APPID_SERIAL] = ctx;
- spin_unlock_bh(&pd->app_lock[OZ_APPID_SERIAL]);
- }
- spin_lock(&g_cdev.lock);
- if ((g_cdev.active_pd == NULL) &&
- ether_addr_equal(pd->mac_addr, g_cdev.active_addr)) {
- oz_pd_get(pd);
- g_cdev.active_pd = pd;
- oz_dbg(ON, "Active PD arrived\n");
- }
- spin_unlock(&g_cdev.lock);
- oz_dbg(ON, "Serial service started\n");
- return 0;
-}
-
-/*
- * Context: softirq or process
- */
-void oz_cdev_stop(struct oz_pd *pd, int pause)
-{
- struct oz_serial_ctx *ctx;
-
- if (pause) {
- oz_dbg(ON, "Serial service paused\n");
- return;
- }
- spin_lock_bh(&pd->app_lock[OZ_APPID_SERIAL]);
- ctx = (struct oz_serial_ctx *) pd->app_ctx[OZ_APPID_SERIAL];
- pd->app_ctx[OZ_APPID_SERIAL] = NULL;
- spin_unlock_bh(&pd->app_lock[OZ_APPID_SERIAL]);
- if (ctx)
- oz_cdev_release_ctx(ctx);
- spin_lock(&g_cdev.lock);
- if (pd == g_cdev.active_pd)
- g_cdev.active_pd = NULL;
- else
- pd = NULL;
- spin_unlock(&g_cdev.lock);
- if (pd) {
- oz_pd_put(pd);
- oz_dbg(ON, "Active PD departed\n");
- }
- oz_dbg(ON, "Serial service stopped\n");
-}
-
-/*
- * Context: softirq-serialized
- */
-void oz_cdev_rx(struct oz_pd *pd, struct oz_elt *elt)
-{
- struct oz_serial_ctx *ctx;
- struct oz_app_hdr *app_hdr;
- u8 *data;
- int len;
- int space;
- int copy_sz;
- int ix;
-
- ctx = oz_cdev_claim_ctx(pd);
- if (ctx == NULL) {
- oz_dbg(ON, "Cannot claim serial context\n");
- return;
- }
-
- app_hdr = (struct oz_app_hdr *)(elt+1);
- /* If sequence number is non-zero then check it is not a duplicate.
- */
- if (app_hdr->elt_seq_num != 0) {
- if (((ctx->rx_seq_num - app_hdr->elt_seq_num) & 0x80) == 0) {
- /* Reject duplicate element. */
- oz_dbg(ON, "Duplicate element:%02x %02x\n",
- app_hdr->elt_seq_num, ctx->rx_seq_num);
- goto out;
- }
- }
- ctx->rx_seq_num = app_hdr->elt_seq_num;
- len = elt->length - sizeof(struct oz_app_hdr);
- data = ((u8 *)(elt+1)) + sizeof(struct oz_app_hdr);
- if (len <= 0)
- goto out;
- space = ctx->rd_out - ctx->rd_in - 1;
- if (space < 0)
- space += OZ_RD_BUF_SZ;
- if (len > space) {
- oz_dbg(ON, "Not enough space:%d %d\n", len, space);
- len = space;
- }
- ix = ctx->rd_in;
- copy_sz = OZ_RD_BUF_SZ - ix;
- if (copy_sz > len)
- copy_sz = len;
- memcpy(&ctx->rd_buf[ix], data, copy_sz);
- len -= copy_sz;
- ix += copy_sz;
- if (ix == OZ_RD_BUF_SZ)
- ix = 0;
- if (len) {
- memcpy(ctx->rd_buf, data+copy_sz, len);
- ix = len;
- }
- ctx->rd_in = ix;
- wake_up(&g_cdev.rdq);
-out:
- oz_cdev_release_ctx(ctx);
-}
Code Review / kvmfornfv.git / blobdiff