1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * av7110_ca.c: CA and CI stuff
4 *
5 * Copyright (C) 1999-2002 Ralph Metzler
6 * & Marcus Metzler for convergence integrated media GmbH
7 *
8 * originally based on code by:
9 * Copyright (C) 1998,1999 Christian Theiss <mistert@rz.fh-augsburg.de>
10 *
11 * the project's page is at https://linuxtv.org
12 */
13
14 #include <linux/kernel.h>
15 #include <linux/types.h>
16 #include <linux/delay.h>
17 #include <linux/fs.h>
18 #include <linux/timer.h>
19 #include <linux/poll.h>
20 #include <linux/gfp.h>
21
22 #include "av7110.h"
23 #include "av7110_hw.h"
24 #include "av7110_ca.h"
25
26
CI_handle(struct av7110 * av7110,u8 * data,u16 len)27 void CI_handle(struct av7110 *av7110, u8 *data, u16 len)
28 {
29 dprintk(8, "av7110:%p\n",av7110);
30
31 if (len < 3)
32 return;
33 switch (data[0]) {
34 case CI_MSG_CI_INFO:
35 if (data[2] != 1 && data[2] != 2)
36 break;
37 switch (data[1]) {
38 case 0:
39 av7110->ci_slot[data[2] - 1].flags = 0;
40 break;
41 case 1:
42 av7110->ci_slot[data[2] - 1].flags |= CA_CI_MODULE_PRESENT;
43 break;
44 case 2:
45 av7110->ci_slot[data[2] - 1].flags |= CA_CI_MODULE_READY;
46 break;
47 }
48 break;
49 case CI_SWITCH_PRG_REPLY:
50 //av7110->ci_stat=data[1];
51 break;
52 default:
53 break;
54 }
55 }
56
57
ci_get_data(struct dvb_ringbuffer * cibuf,u8 * data,int len)58 void ci_get_data(struct dvb_ringbuffer *cibuf, u8 *data, int len)
59 {
60 if (dvb_ringbuffer_free(cibuf) < len + 2)
61 return;
62
63 DVB_RINGBUFFER_WRITE_BYTE(cibuf, len >> 8);
64 DVB_RINGBUFFER_WRITE_BYTE(cibuf, len & 0xff);
65 dvb_ringbuffer_write(cibuf, data, len);
66 wake_up_interruptible(&cibuf->queue);
67 }
68
69
70 /******************************************************************************
71 * CI link layer file ops
72 ******************************************************************************/
73
ci_ll_init(struct dvb_ringbuffer * cirbuf,struct dvb_ringbuffer * ciwbuf,int size)74 static int ci_ll_init(struct dvb_ringbuffer *cirbuf, struct dvb_ringbuffer *ciwbuf, int size)
75 {
76 struct dvb_ringbuffer *tab[] = { cirbuf, ciwbuf, NULL }, **p;
77 void *data;
78
79 for (p = tab; *p; p++) {
80 data = vmalloc(size);
81 if (!data) {
82 while (p-- != tab) {
83 vfree(p[0]->data);
84 p[0]->data = NULL;
85 }
86 return -ENOMEM;
87 }
88 dvb_ringbuffer_init(*p, data, size);
89 }
90 return 0;
91 }
92
ci_ll_flush(struct dvb_ringbuffer * cirbuf,struct dvb_ringbuffer * ciwbuf)93 static void ci_ll_flush(struct dvb_ringbuffer *cirbuf, struct dvb_ringbuffer *ciwbuf)
94 {
95 dvb_ringbuffer_flush_spinlock_wakeup(cirbuf);
96 dvb_ringbuffer_flush_spinlock_wakeup(ciwbuf);
97 }
98
ci_ll_release(struct dvb_ringbuffer * cirbuf,struct dvb_ringbuffer * ciwbuf)99 static void ci_ll_release(struct dvb_ringbuffer *cirbuf, struct dvb_ringbuffer *ciwbuf)
100 {
101 vfree(cirbuf->data);
102 cirbuf->data = NULL;
103 vfree(ciwbuf->data);
104 ciwbuf->data = NULL;
105 }
106
ci_ll_reset(struct dvb_ringbuffer * cibuf,struct file * file,int slots,struct ca_slot_info * slot)107 static int ci_ll_reset(struct dvb_ringbuffer *cibuf, struct file *file,
108 int slots, struct ca_slot_info *slot)
109 {
110 int i;
111 int len = 0;
112 u8 msg[8] = { 0x00, 0x06, 0x00, 0x00, 0xff, 0x02, 0x00, 0x00 };
113
114 for (i = 0; i < 2; i++) {
115 if (slots & (1 << i))
116 len += 8;
117 }
118
119 if (dvb_ringbuffer_free(cibuf) < len)
120 return -EBUSY;
121
122 for (i = 0; i < 2; i++) {
123 if (slots & (1 << i)) {
124 msg[2] = i;
125 dvb_ringbuffer_write(cibuf, msg, 8);
126 slot[i].flags = 0;
127 }
128 }
129
130 return 0;
131 }
132
ci_ll_write(struct dvb_ringbuffer * cibuf,struct file * file,const char __user * buf,size_t count,loff_t * ppos)133 static ssize_t ci_ll_write(struct dvb_ringbuffer *cibuf, struct file *file,
134 const char __user *buf, size_t count, loff_t *ppos)
135 {
136 int free;
137 int non_blocking = file->f_flags & O_NONBLOCK;
138 u8 *page = (u8 *)__get_free_page(GFP_USER);
139 int res;
140
141 if (!page)
142 return -ENOMEM;
143
144 res = -EINVAL;
145 if (count > 2048)
146 goto out;
147
148 res = -EFAULT;
149 if (copy_from_user(page, buf, count))
150 goto out;
151
152 free = dvb_ringbuffer_free(cibuf);
153 if (count + 2 > free) {
154 res = -EWOULDBLOCK;
155 if (non_blocking)
156 goto out;
157 res = -ERESTARTSYS;
158 if (wait_event_interruptible(cibuf->queue,
159 (dvb_ringbuffer_free(cibuf) >= count + 2)))
160 goto out;
161 }
162
163 DVB_RINGBUFFER_WRITE_BYTE(cibuf, count >> 8);
164 DVB_RINGBUFFER_WRITE_BYTE(cibuf, count & 0xff);
165
166 res = dvb_ringbuffer_write(cibuf, page, count);
167 out:
168 free_page((unsigned long)page);
169 return res;
170 }
171
ci_ll_read(struct dvb_ringbuffer * cibuf,struct file * file,char __user * buf,size_t count,loff_t * ppos)172 static ssize_t ci_ll_read(struct dvb_ringbuffer *cibuf, struct file *file,
173 char __user *buf, size_t count, loff_t *ppos)
174 {
175 int avail;
176 int non_blocking = file->f_flags & O_NONBLOCK;
177 ssize_t len;
178
179 if (!cibuf->data || !count)
180 return 0;
181 if (non_blocking && (dvb_ringbuffer_empty(cibuf)))
182 return -EWOULDBLOCK;
183 if (wait_event_interruptible(cibuf->queue,
184 !dvb_ringbuffer_empty(cibuf)))
185 return -ERESTARTSYS;
186 avail = dvb_ringbuffer_avail(cibuf);
187 if (avail < 4)
188 return 0;
189 len = DVB_RINGBUFFER_PEEK(cibuf, 0) << 8;
190 len |= DVB_RINGBUFFER_PEEK(cibuf, 1);
191 if (avail < len + 2 || count < len)
192 return -EINVAL;
193 DVB_RINGBUFFER_SKIP(cibuf, 2);
194
195 return dvb_ringbuffer_read_user(cibuf, buf, len);
196 }
197
dvb_ca_open(struct inode * inode,struct file * file)198 static int dvb_ca_open(struct inode *inode, struct file *file)
199 {
200 struct dvb_device *dvbdev = file->private_data;
201 struct av7110 *av7110 = dvbdev->priv;
202 int err = dvb_generic_open(inode, file);
203
204 dprintk(8, "av7110:%p\n",av7110);
205
206 if (err < 0)
207 return err;
208 ci_ll_flush(&av7110->ci_rbuffer, &av7110->ci_wbuffer);
209 return 0;
210 }
211
dvb_ca_poll(struct file * file,poll_table * wait)212 static __poll_t dvb_ca_poll (struct file *file, poll_table *wait)
213 {
214 struct dvb_device *dvbdev = file->private_data;
215 struct av7110 *av7110 = dvbdev->priv;
216 struct dvb_ringbuffer *rbuf = &av7110->ci_rbuffer;
217 struct dvb_ringbuffer *wbuf = &av7110->ci_wbuffer;
218 __poll_t mask = 0;
219
220 dprintk(8, "av7110:%p\n",av7110);
221
222 poll_wait(file, &rbuf->queue, wait);
223 poll_wait(file, &wbuf->queue, wait);
224
225 if (!dvb_ringbuffer_empty(rbuf))
226 mask |= (EPOLLIN | EPOLLRDNORM);
227
228 if (dvb_ringbuffer_free(wbuf) > 1024)
229 mask |= (EPOLLOUT | EPOLLWRNORM);
230
231 return mask;
232 }
233
dvb_ca_ioctl(struct file * file,unsigned int cmd,void * parg)234 static int dvb_ca_ioctl(struct file *file, unsigned int cmd, void *parg)
235 {
236 struct dvb_device *dvbdev = file->private_data;
237 struct av7110 *av7110 = dvbdev->priv;
238 unsigned long arg = (unsigned long) parg;
239 int ret = 0;
240
241 dprintk(8, "av7110:%p\n",av7110);
242
243 if (mutex_lock_interruptible(&av7110->ioctl_mutex))
244 return -ERESTARTSYS;
245
246 switch (cmd) {
247 case CA_RESET:
248 ret = ci_ll_reset(&av7110->ci_wbuffer, file, arg,
249 &av7110->ci_slot[0]);
250 break;
251 case CA_GET_CAP:
252 {
253 struct ca_caps cap;
254
255 cap.slot_num = 2;
256 cap.slot_type = (FW_CI_LL_SUPPORT(av7110->arm_app) ?
257 CA_CI_LINK : CA_CI) | CA_DESCR;
258 cap.descr_num = 16;
259 cap.descr_type = CA_ECD;
260 memcpy(parg, &cap, sizeof(cap));
261 break;
262 }
263
264 case CA_GET_SLOT_INFO:
265 {
266 struct ca_slot_info *info=(struct ca_slot_info *)parg;
267
268 if (info->num < 0 || info->num > 1) {
269 mutex_unlock(&av7110->ioctl_mutex);
270 return -EINVAL;
271 }
272 av7110->ci_slot[info->num].num = info->num;
273 av7110->ci_slot[info->num].type = FW_CI_LL_SUPPORT(av7110->arm_app) ?
274 CA_CI_LINK : CA_CI;
275 memcpy(info, &av7110->ci_slot[info->num], sizeof(struct ca_slot_info));
276 break;
277 }
278
279 case CA_GET_MSG:
280 break;
281
282 case CA_SEND_MSG:
283 break;
284
285 case CA_GET_DESCR_INFO:
286 {
287 struct ca_descr_info info;
288
289 info.num = 16;
290 info.type = CA_ECD;
291 memcpy(parg, &info, sizeof (info));
292 break;
293 }
294
295 case CA_SET_DESCR:
296 {
297 struct ca_descr *descr = (struct ca_descr*) parg;
298
299 if (descr->index >= 16 || descr->parity > 1) {
300 mutex_unlock(&av7110->ioctl_mutex);
301 return -EINVAL;
302 }
303 av7110_fw_cmd(av7110, COMTYPE_PIDFILTER, SetDescr, 5,
304 (descr->index<<8)|descr->parity,
305 (descr->cw[0]<<8)|descr->cw[1],
306 (descr->cw[2]<<8)|descr->cw[3],
307 (descr->cw[4]<<8)|descr->cw[5],
308 (descr->cw[6]<<8)|descr->cw[7]);
309 break;
310 }
311
312 default:
313 ret = -EINVAL;
314 break;
315 }
316
317 mutex_unlock(&av7110->ioctl_mutex);
318 return ret;
319 }
320
dvb_ca_write(struct file * file,const char __user * buf,size_t count,loff_t * ppos)321 static ssize_t dvb_ca_write(struct file *file, const char __user *buf,
322 size_t count, loff_t *ppos)
323 {
324 struct dvb_device *dvbdev = file->private_data;
325 struct av7110 *av7110 = dvbdev->priv;
326
327 dprintk(8, "av7110:%p\n",av7110);
328 return ci_ll_write(&av7110->ci_wbuffer, file, buf, count, ppos);
329 }
330
dvb_ca_read(struct file * file,char __user * buf,size_t count,loff_t * ppos)331 static ssize_t dvb_ca_read(struct file *file, char __user *buf,
332 size_t count, loff_t *ppos)
333 {
334 struct dvb_device *dvbdev = file->private_data;
335 struct av7110 *av7110 = dvbdev->priv;
336
337 dprintk(8, "av7110:%p\n",av7110);
338 return ci_ll_read(&av7110->ci_rbuffer, file, buf, count, ppos);
339 }
340
341 static const struct file_operations dvb_ca_fops = {
342 .owner = THIS_MODULE,
343 .read = dvb_ca_read,
344 .write = dvb_ca_write,
345 .unlocked_ioctl = dvb_generic_ioctl,
346 .open = dvb_ca_open,
347 .release = dvb_generic_release,
348 .poll = dvb_ca_poll,
349 .llseek = default_llseek,
350 };
351
352 static struct dvb_device dvbdev_ca = {
353 .priv = NULL,
354 .users = 1,
355 .writers = 1,
356 .fops = &dvb_ca_fops,
357 .kernel_ioctl = dvb_ca_ioctl,
358 };
359
360
av7110_ca_register(struct av7110 * av7110)361 int av7110_ca_register(struct av7110 *av7110)
362 {
363 return dvb_register_device(&av7110->dvb_adapter, &av7110->ca_dev,
364 &dvbdev_ca, av7110, DVB_DEVICE_CA, 0);
365 }
366
av7110_ca_unregister(struct av7110 * av7110)367 void av7110_ca_unregister(struct av7110 *av7110)
368 {
369 dvb_unregister_device(av7110->ca_dev);
370 }
371
av7110_ca_init(struct av7110 * av7110)372 int av7110_ca_init(struct av7110* av7110)
373 {
374 return ci_ll_init(&av7110->ci_rbuffer, &av7110->ci_wbuffer, 8192);
375 }
376
av7110_ca_exit(struct av7110 * av7110)377 void av7110_ca_exit(struct av7110* av7110)
378 {
379 ci_ll_release(&av7110->ci_rbuffer, &av7110->ci_wbuffer);
380 }
381
