diff options
Diffstat (limited to 'kernel/drivers/staging/ozwpan/ozcdev.c')
-rw-r--r-- | kernel/drivers/staging/ozwpan/ozcdev.c | 554 |
1 files changed, 0 insertions, 554 deletions
diff --git a/kernel/drivers/staging/ozwpan/ozcdev.c b/kernel/drivers/staging/ozwpan/ozcdev.c deleted file mode 100644 index da0e1fd50..000000000 --- a/kernel/drivers/staging/ozwpan/ozcdev.c +++ /dev/null @@ -1,554 +0,0 @@ -/* ----------------------------------------------------------------------------- - * 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); -} |