1 /* -----------------------------------------------------------------------------
2 * Copyright (c) 2011 Ozmo Inc
3 * Released under the GNU General Public License Version 2 (GPLv2).
4 * -----------------------------------------------------------------------------
6 #include <linux/module.h>
8 #include <linux/cdev.h>
9 #include <linux/uaccess.h>
10 #include <linux/netdevice.h>
11 #include <linux/etherdevice.h>
12 #include <linux/poll.h>
13 #include <linux/sched.h>
15 #include "ozprotocol.h"
22 #define OZ_RD_BUF_SZ 256
26 wait_queue_head_t rdq;
28 u8 active_addr[ETH_ALEN];
29 struct oz_pd *active_pd;
32 /* Per PD context for the serial service stored in the PD. */
33 struct oz_serial_ctx {
37 u8 rd_buf[OZ_RD_BUF_SZ];
42 static struct oz_cdev g_cdev;
43 static struct class *g_oz_class;
46 * Context: process and softirq
48 static struct oz_serial_ctx *oz_cdev_claim_ctx(struct oz_pd *pd)
50 struct oz_serial_ctx *ctx;
52 spin_lock_bh(&pd->app_lock[OZ_APPID_SERIAL]);
53 ctx = (struct oz_serial_ctx *) pd->app_ctx[OZ_APPID_SERIAL];
55 atomic_inc(&ctx->ref_count);
56 spin_unlock_bh(&pd->app_lock[OZ_APPID_SERIAL]);
61 * Context: softirq or process
63 static void oz_cdev_release_ctx(struct oz_serial_ctx *ctx)
65 if (atomic_dec_and_test(&ctx->ref_count)) {
66 oz_dbg(ON, "Dealloc serial context\n");
74 static int oz_cdev_open(struct inode *inode, struct file *filp)
76 struct oz_cdev *dev = container_of(inode->i_cdev, struct oz_cdev, cdev);
78 oz_dbg(ON, "major = %d minor = %d\n", imajor(inode), iminor(inode));
80 filp->private_data = dev;
87 static int oz_cdev_release(struct inode *inode, struct file *filp)
95 static ssize_t oz_cdev_read(struct file *filp, char __user *buf, size_t count,
102 struct oz_serial_ctx *ctx;
104 spin_lock_bh(&g_cdev.lock);
105 pd = g_cdev.active_pd;
108 spin_unlock_bh(&g_cdev.lock);
111 ctx = oz_cdev_claim_ctx(pd);
114 n = ctx->rd_in - ctx->rd_out;
120 n = OZ_RD_BUF_SZ - ix;
123 if (copy_to_user(buf, &ctx->rd_buf[ix], n)) {
128 if (ix == OZ_RD_BUF_SZ)
131 if (copy_to_user(&buf[n], ctx->rd_buf, count-n)) {
139 oz_cdev_release_ctx(ctx);
148 static ssize_t oz_cdev_write(struct file *filp, const char __user *buf,
149 size_t count, loff_t *fpos)
152 struct oz_elt_buf *eb;
153 struct oz_elt_info *ei;
155 struct oz_app_hdr *app_hdr;
156 struct oz_serial_ctx *ctx;
158 if (count > sizeof(ei->data) - sizeof(*elt) - sizeof(*app_hdr))
161 spin_lock_bh(&g_cdev.lock);
162 pd = g_cdev.active_pd;
165 spin_unlock_bh(&g_cdev.lock);
168 if (!(pd->state & OZ_PD_S_CONNECTED))
171 ei = oz_elt_info_alloc(eb);
176 elt = (struct oz_elt *)ei->data;
177 app_hdr = (struct oz_app_hdr *)(elt+1);
178 elt->length = sizeof(struct oz_app_hdr) + count;
179 elt->type = OZ_ELT_APP_DATA;
180 ei->app_id = OZ_APPID_SERIAL;
181 ei->length = elt->length + sizeof(struct oz_elt);
182 app_hdr->app_id = OZ_APPID_SERIAL;
183 if (copy_from_user(app_hdr+1, buf, count))
185 spin_lock_bh(&pd->app_lock[OZ_APPID_USB]);
186 ctx = (struct oz_serial_ctx *) pd->app_ctx[OZ_APPID_SERIAL];
188 app_hdr->elt_seq_num = ctx->tx_seq_num++;
189 if (ctx->tx_seq_num == 0)
191 spin_lock(&eb->lock);
192 if (oz_queue_elt_info(eb, 0, 0, ei) == 0)
194 spin_unlock(&eb->lock);
196 spin_unlock_bh(&pd->app_lock[OZ_APPID_USB]);
200 spin_lock_bh(&eb->lock);
201 oz_elt_info_free(eb, ei);
202 spin_unlock_bh(&eb->lock);
211 static int oz_set_active_pd(const u8 *addr)
215 struct oz_pd *old_pd;
217 pd = oz_pd_find(addr);
219 spin_lock_bh(&g_cdev.lock);
220 ether_addr_copy(g_cdev.active_addr, addr);
221 old_pd = g_cdev.active_pd;
222 g_cdev.active_pd = pd;
223 spin_unlock_bh(&g_cdev.lock);
227 if (is_zero_ether_addr(addr)) {
228 spin_lock_bh(&g_cdev.lock);
229 pd = g_cdev.active_pd;
230 g_cdev.active_pd = NULL;
231 memset(g_cdev.active_addr, 0,
232 sizeof(g_cdev.active_addr));
233 spin_unlock_bh(&g_cdev.lock);
246 static long oz_cdev_ioctl(struct file *filp, unsigned int cmd,
251 if (_IOC_TYPE(cmd) != OZ_IOCTL_MAGIC)
253 if (_IOC_NR(cmd) > OZ_IOCTL_MAX)
255 if (_IOC_DIR(cmd) & _IOC_READ)
256 rc = !access_ok(VERIFY_WRITE, (void __user *)arg,
258 else if (_IOC_DIR(cmd) & _IOC_WRITE)
259 rc = !access_ok(VERIFY_READ, (void __user *)arg,
264 case OZ_IOCTL_GET_PD_LIST: {
265 struct oz_pd_list list;
267 oz_dbg(ON, "OZ_IOCTL_GET_PD_LIST\n");
268 memset(&list, 0, sizeof(list));
269 list.count = oz_get_pd_list(list.addr, OZ_MAX_PDS);
270 if (copy_to_user((void __user *)arg, &list,
275 case OZ_IOCTL_SET_ACTIVE_PD: {
278 oz_dbg(ON, "OZ_IOCTL_SET_ACTIVE_PD\n");
279 if (copy_from_user(addr, (void __user *)arg, ETH_ALEN))
281 rc = oz_set_active_pd(addr);
284 case OZ_IOCTL_GET_ACTIVE_PD: {
287 oz_dbg(ON, "OZ_IOCTL_GET_ACTIVE_PD\n");
288 spin_lock_bh(&g_cdev.lock);
289 ether_addr_copy(addr, g_cdev.active_addr);
290 spin_unlock_bh(&g_cdev.lock);
291 if (copy_to_user((void __user *)arg, addr, ETH_ALEN))
295 case OZ_IOCTL_ADD_BINDING:
296 case OZ_IOCTL_REMOVE_BINDING: {
297 struct oz_binding_info b;
299 if (copy_from_user(&b, (void __user *)arg,
300 sizeof(struct oz_binding_info))) {
303 /* Make sure name is null terminated. */
304 b.name[OZ_MAX_BINDING_LEN-1] = 0;
305 if (cmd == OZ_IOCTL_ADD_BINDING)
306 oz_binding_add(b.name);
308 oz_binding_remove(b.name);
318 static unsigned int oz_cdev_poll(struct file *filp, poll_table *wait)
320 unsigned int ret = 0;
321 struct oz_cdev *dev = filp->private_data;
323 oz_dbg(ON, "Poll called wait = %p\n", wait);
324 spin_lock_bh(&dev->lock);
325 if (dev->active_pd) {
326 struct oz_serial_ctx *ctx = oz_cdev_claim_ctx(dev->active_pd);
329 if (ctx->rd_in != ctx->rd_out)
330 ret |= POLLIN | POLLRDNORM;
331 oz_cdev_release_ctx(ctx);
334 spin_unlock_bh(&dev->lock);
336 poll_wait(filp, &dev->rdq, wait);
342 static const struct file_operations oz_fops = {
343 .owner = THIS_MODULE,
344 .open = oz_cdev_open,
345 .release = oz_cdev_release,
346 .read = oz_cdev_read,
347 .write = oz_cdev_write,
348 .unlocked_ioctl = oz_cdev_ioctl,
355 int oz_cdev_register(void)
360 memset(&g_cdev, 0, sizeof(g_cdev));
361 err = alloc_chrdev_region(&g_cdev.devnum, 0, 1, "ozwpan");
364 oz_dbg(ON, "Alloc dev number %d:%d\n",
365 MAJOR(g_cdev.devnum), MINOR(g_cdev.devnum));
366 cdev_init(&g_cdev.cdev, &oz_fops);
367 g_cdev.cdev.owner = THIS_MODULE;
368 spin_lock_init(&g_cdev.lock);
369 init_waitqueue_head(&g_cdev.rdq);
370 err = cdev_add(&g_cdev.cdev, g_cdev.devnum, 1);
372 oz_dbg(ON, "Failed to add cdev\n");
375 g_oz_class = class_create(THIS_MODULE, "ozmo_wpan");
376 if (IS_ERR(g_oz_class)) {
377 oz_dbg(ON, "Failed to register ozmo_wpan class\n");
378 err = PTR_ERR(g_oz_class);
381 dev = device_create(g_oz_class, NULL, g_cdev.devnum, NULL, "ozwpan");
383 oz_dbg(ON, "Failed to create sysfs entry for cdev\n");
390 cdev_del(&g_cdev.cdev);
392 unregister_chrdev_region(g_cdev.devnum, 1);
399 int oz_cdev_deregister(void)
401 cdev_del(&g_cdev.cdev);
402 unregister_chrdev_region(g_cdev.devnum, 1);
404 device_destroy(g_oz_class, g_cdev.devnum);
405 class_destroy(g_oz_class);
413 int oz_cdev_init(void)
415 oz_app_enable(OZ_APPID_SERIAL, 1);
422 void oz_cdev_term(void)
424 oz_app_enable(OZ_APPID_SERIAL, 0);
428 * Context: softirq-serialized
430 int oz_cdev_start(struct oz_pd *pd, int resume)
432 struct oz_serial_ctx *ctx;
433 struct oz_serial_ctx *old_ctx;
436 oz_dbg(ON, "Serial service resumed\n");
439 ctx = kzalloc(sizeof(struct oz_serial_ctx), GFP_ATOMIC);
442 atomic_set(&ctx->ref_count, 1);
444 spin_lock_bh(&pd->app_lock[OZ_APPID_SERIAL]);
445 old_ctx = pd->app_ctx[OZ_APPID_SERIAL];
447 spin_unlock_bh(&pd->app_lock[OZ_APPID_SERIAL]);
450 pd->app_ctx[OZ_APPID_SERIAL] = ctx;
451 spin_unlock_bh(&pd->app_lock[OZ_APPID_SERIAL]);
453 spin_lock(&g_cdev.lock);
454 if ((g_cdev.active_pd == NULL) &&
455 ether_addr_equal(pd->mac_addr, g_cdev.active_addr)) {
457 g_cdev.active_pd = pd;
458 oz_dbg(ON, "Active PD arrived\n");
460 spin_unlock(&g_cdev.lock);
461 oz_dbg(ON, "Serial service started\n");
466 * Context: softirq or process
468 void oz_cdev_stop(struct oz_pd *pd, int pause)
470 struct oz_serial_ctx *ctx;
473 oz_dbg(ON, "Serial service paused\n");
476 spin_lock_bh(&pd->app_lock[OZ_APPID_SERIAL]);
477 ctx = (struct oz_serial_ctx *) pd->app_ctx[OZ_APPID_SERIAL];
478 pd->app_ctx[OZ_APPID_SERIAL] = NULL;
479 spin_unlock_bh(&pd->app_lock[OZ_APPID_SERIAL]);
481 oz_cdev_release_ctx(ctx);
482 spin_lock(&g_cdev.lock);
483 if (pd == g_cdev.active_pd)
484 g_cdev.active_pd = NULL;
487 spin_unlock(&g_cdev.lock);
490 oz_dbg(ON, "Active PD departed\n");
492 oz_dbg(ON, "Serial service stopped\n");
496 * Context: softirq-serialized
498 void oz_cdev_rx(struct oz_pd *pd, struct oz_elt *elt)
500 struct oz_serial_ctx *ctx;
501 struct oz_app_hdr *app_hdr;
508 ctx = oz_cdev_claim_ctx(pd);
510 oz_dbg(ON, "Cannot claim serial context\n");
514 app_hdr = (struct oz_app_hdr *)(elt+1);
515 /* If sequence number is non-zero then check it is not a duplicate.
517 if (app_hdr->elt_seq_num != 0) {
518 if (((ctx->rx_seq_num - app_hdr->elt_seq_num) & 0x80) == 0) {
519 /* Reject duplicate element. */
520 oz_dbg(ON, "Duplicate element:%02x %02x\n",
521 app_hdr->elt_seq_num, ctx->rx_seq_num);
525 ctx->rx_seq_num = app_hdr->elt_seq_num;
526 len = elt->length - sizeof(struct oz_app_hdr);
527 data = ((u8 *)(elt+1)) + sizeof(struct oz_app_hdr);
530 space = ctx->rd_out - ctx->rd_in - 1;
532 space += OZ_RD_BUF_SZ;
534 oz_dbg(ON, "Not enough space:%d %d\n", len, space);
538 copy_sz = OZ_RD_BUF_SZ - ix;
541 memcpy(&ctx->rd_buf[ix], data, copy_sz);
544 if (ix == OZ_RD_BUF_SZ)
547 memcpy(ctx->rd_buf, data+copy_sz, len);
551 wake_up(&g_cdev.rdq);
553 oz_cdev_release_ctx(ctx);