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-1]);
53 ctx = (struct oz_serial_ctx *)pd->app_ctx[OZ_APPID_SERIAL-1];
55 atomic_inc(&ctx->ref_count);
56 spin_unlock_bh(&pd->app_lock[OZ_APPID_SERIAL-1]);
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 spin_lock_bh(&g_cdev.lock);
159 pd = g_cdev.active_pd;
162 spin_unlock_bh(&g_cdev.lock);
165 if (!(pd->state & OZ_PD_S_CONNECTED))
168 ei = oz_elt_info_alloc(eb);
173 elt = (struct oz_elt *)ei->data;
174 app_hdr = (struct oz_app_hdr *)(elt+1);
175 elt->length = sizeof(struct oz_app_hdr) + count;
176 elt->type = OZ_ELT_APP_DATA;
177 ei->app_id = OZ_APPID_SERIAL;
178 ei->length = elt->length + sizeof(struct oz_elt);
179 app_hdr->app_id = OZ_APPID_SERIAL;
180 if (copy_from_user(app_hdr+1, buf, count))
182 spin_lock_bh(&pd->app_lock[OZ_APPID_USB-1]);
183 ctx = (struct oz_serial_ctx *)pd->app_ctx[OZ_APPID_SERIAL-1];
185 app_hdr->elt_seq_num = ctx->tx_seq_num++;
186 if (ctx->tx_seq_num == 0)
188 spin_lock(&eb->lock);
189 if (oz_queue_elt_info(eb, 0, 0, ei) == 0)
191 spin_unlock(&eb->lock);
193 spin_unlock_bh(&pd->app_lock[OZ_APPID_USB-1]);
197 spin_lock_bh(&eb->lock);
198 oz_elt_info_free(eb, ei);
199 spin_unlock_bh(&eb->lock);
208 static int oz_set_active_pd(const u8 *addr)
212 struct oz_pd *old_pd;
214 pd = oz_pd_find(addr);
216 spin_lock_bh(&g_cdev.lock);
217 memcpy(g_cdev.active_addr, addr, ETH_ALEN);
218 old_pd = g_cdev.active_pd;
219 g_cdev.active_pd = pd;
220 spin_unlock_bh(&g_cdev.lock);
224 if (is_zero_ether_addr(addr)) {
225 spin_lock_bh(&g_cdev.lock);
226 pd = g_cdev.active_pd;
227 g_cdev.active_pd = NULL;
228 memset(g_cdev.active_addr, 0,
229 sizeof(g_cdev.active_addr));
230 spin_unlock_bh(&g_cdev.lock);
243 static long oz_cdev_ioctl(struct file *filp, unsigned int cmd,
248 if (_IOC_TYPE(cmd) != OZ_IOCTL_MAGIC)
250 if (_IOC_NR(cmd) > OZ_IOCTL_MAX)
252 if (_IOC_DIR(cmd) & _IOC_READ)
253 rc = !access_ok(VERIFY_WRITE, (void __user *)arg,
255 else if (_IOC_DIR(cmd) & _IOC_WRITE)
256 rc = !access_ok(VERIFY_READ, (void __user *)arg,
261 case OZ_IOCTL_GET_PD_LIST: {
262 struct oz_pd_list list;
263 oz_dbg(ON, "OZ_IOCTL_GET_PD_LIST\n");
264 memset(&list, 0, sizeof(list));
265 list.count = oz_get_pd_list(list.addr, OZ_MAX_PDS);
266 if (copy_to_user((void __user *)arg, &list,
271 case OZ_IOCTL_SET_ACTIVE_PD: {
273 oz_dbg(ON, "OZ_IOCTL_SET_ACTIVE_PD\n");
274 if (copy_from_user(addr, (void __user *)arg, ETH_ALEN))
276 rc = oz_set_active_pd(addr);
279 case OZ_IOCTL_GET_ACTIVE_PD: {
281 oz_dbg(ON, "OZ_IOCTL_GET_ACTIVE_PD\n");
282 spin_lock_bh(&g_cdev.lock);
283 memcpy(addr, g_cdev.active_addr, ETH_ALEN);
284 spin_unlock_bh(&g_cdev.lock);
285 if (copy_to_user((void __user *)arg, addr, ETH_ALEN))
289 case OZ_IOCTL_ADD_BINDING:
290 case OZ_IOCTL_REMOVE_BINDING: {
291 struct oz_binding_info b;
292 if (copy_from_user(&b, (void __user *)arg,
293 sizeof(struct oz_binding_info))) {
296 /* Make sure name is null terminated. */
297 b.name[OZ_MAX_BINDING_LEN-1] = 0;
298 if (cmd == OZ_IOCTL_ADD_BINDING)
299 oz_binding_add(b.name);
301 oz_binding_remove(b.name);
311 static unsigned int oz_cdev_poll(struct file *filp, poll_table *wait)
313 unsigned int ret = 0;
314 struct oz_cdev *dev = filp->private_data;
316 oz_dbg(ON, "Poll called wait = %p\n", wait);
317 spin_lock_bh(&dev->lock);
318 if (dev->active_pd) {
319 struct oz_serial_ctx *ctx = oz_cdev_claim_ctx(dev->active_pd);
321 if (ctx->rd_in != ctx->rd_out)
322 ret |= POLLIN | POLLRDNORM;
323 oz_cdev_release_ctx(ctx);
326 spin_unlock_bh(&dev->lock);
328 poll_wait(filp, &dev->rdq, wait);
334 static const struct file_operations oz_fops = {
335 .owner = THIS_MODULE,
336 .open = oz_cdev_open,
337 .release = oz_cdev_release,
338 .read = oz_cdev_read,
339 .write = oz_cdev_write,
340 .unlocked_ioctl = oz_cdev_ioctl,
347 int oz_cdev_register(void)
352 memset(&g_cdev, 0, sizeof(g_cdev));
353 err = alloc_chrdev_region(&g_cdev.devnum, 0, 1, "ozwpan");
356 oz_dbg(ON, "Alloc dev number %d:%d\n",
357 MAJOR(g_cdev.devnum), MINOR(g_cdev.devnum));
358 cdev_init(&g_cdev.cdev, &oz_fops);
359 g_cdev.cdev.owner = THIS_MODULE;
360 g_cdev.cdev.ops = &oz_fops;
361 spin_lock_init(&g_cdev.lock);
362 init_waitqueue_head(&g_cdev.rdq);
363 err = cdev_add(&g_cdev.cdev, g_cdev.devnum, 1);
365 oz_dbg(ON, "Failed to add cdev\n");
368 g_oz_class = class_create(THIS_MODULE, "ozmo_wpan");
369 if (IS_ERR(g_oz_class)) {
370 oz_dbg(ON, "Failed to register ozmo_wpan class\n");
371 err = PTR_ERR(g_oz_class);
374 dev = device_create(g_oz_class, NULL, g_cdev.devnum, NULL, "ozwpan");
376 oz_dbg(ON, "Failed to create sysfs entry for cdev\n");
383 cdev_del(&g_cdev.cdev);
385 unregister_chrdev_region(g_cdev.devnum, 1);
392 int oz_cdev_deregister(void)
394 cdev_del(&g_cdev.cdev);
395 unregister_chrdev_region(g_cdev.devnum, 1);
397 device_destroy(g_oz_class, g_cdev.devnum);
398 class_destroy(g_oz_class);
406 int oz_cdev_init(void)
408 oz_app_enable(OZ_APPID_SERIAL, 1);
415 void oz_cdev_term(void)
417 oz_app_enable(OZ_APPID_SERIAL, 0);
421 * Context: softirq-serialized
423 int oz_cdev_start(struct oz_pd *pd, int resume)
425 struct oz_serial_ctx *ctx;
426 struct oz_serial_ctx *old_ctx;
429 oz_dbg(ON, "Serial service resumed\n");
432 ctx = kzalloc(sizeof(struct oz_serial_ctx), GFP_ATOMIC);
435 atomic_set(&ctx->ref_count, 1);
437 spin_lock_bh(&pd->app_lock[OZ_APPID_SERIAL-1]);
438 old_ctx = pd->app_ctx[OZ_APPID_SERIAL-1];
440 spin_unlock_bh(&pd->app_lock[OZ_APPID_SERIAL-1]);
443 pd->app_ctx[OZ_APPID_SERIAL-1] = ctx;
444 spin_unlock_bh(&pd->app_lock[OZ_APPID_SERIAL-1]);
446 spin_lock(&g_cdev.lock);
447 if ((g_cdev.active_pd == NULL) &&
448 (memcmp(pd->mac_addr, g_cdev.active_addr, ETH_ALEN) == 0)) {
450 g_cdev.active_pd = pd;
451 oz_dbg(ON, "Active PD arrived\n");
453 spin_unlock(&g_cdev.lock);
454 oz_dbg(ON, "Serial service started\n");
459 * Context: softirq or process
461 void oz_cdev_stop(struct oz_pd *pd, int pause)
463 struct oz_serial_ctx *ctx;
466 oz_dbg(ON, "Serial service paused\n");
469 spin_lock_bh(&pd->app_lock[OZ_APPID_SERIAL-1]);
470 ctx = (struct oz_serial_ctx *)pd->app_ctx[OZ_APPID_SERIAL-1];
471 pd->app_ctx[OZ_APPID_SERIAL-1] = NULL;
472 spin_unlock_bh(&pd->app_lock[OZ_APPID_SERIAL-1]);
474 oz_cdev_release_ctx(ctx);
475 spin_lock(&g_cdev.lock);
476 if (pd == g_cdev.active_pd)
477 g_cdev.active_pd = NULL;
480 spin_unlock(&g_cdev.lock);
483 oz_dbg(ON, "Active PD departed\n");
485 oz_dbg(ON, "Serial service stopped\n");
489 * Context: softirq-serialized
491 void oz_cdev_rx(struct oz_pd *pd, struct oz_elt *elt)
493 struct oz_serial_ctx *ctx;
494 struct oz_app_hdr *app_hdr;
501 ctx = oz_cdev_claim_ctx(pd);
503 oz_dbg(ON, "Cannot claim serial context\n");
507 app_hdr = (struct oz_app_hdr *)(elt+1);
508 /* If sequence number is non-zero then check it is not a duplicate.
510 if (app_hdr->elt_seq_num != 0) {
511 if (((ctx->rx_seq_num - app_hdr->elt_seq_num) & 0x80) == 0) {
512 /* Reject duplicate element. */
513 oz_dbg(ON, "Duplicate element:%02x %02x\n",
514 app_hdr->elt_seq_num, ctx->rx_seq_num);
518 ctx->rx_seq_num = app_hdr->elt_seq_num;
519 len = elt->length - sizeof(struct oz_app_hdr);
520 data = ((u8 *)(elt+1)) + sizeof(struct oz_app_hdr);
523 space = ctx->rd_out - ctx->rd_in - 1;
525 space += OZ_RD_BUF_SZ;
527 oz_dbg(ON, "Not enough space:%d %d\n", len, space);
531 copy_sz = OZ_RD_BUF_SZ - ix;
534 memcpy(&ctx->rd_buf[ix], data, copy_sz);
537 if (ix == OZ_RD_BUF_SZ)
540 memcpy(ctx->rd_buf, data+copy_sz, len);
544 wake_up(&g_cdev.rdq);
546 oz_cdev_release_ctx(ctx);