1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Abilis Systems Single DVB-T Receiver
4 * Copyright (C) 2008 Pierrick Hascoet <pierrick.hascoet@abilis.com>
5 * Copyright (C) 2010 Devin Heitmueller <dheitmueller@kernellabs.com>
6 */
7 #include <linux/kernel.h>
8 #include <linux/errno.h>
9 #include <linux/slab.h>
10 #include <linux/mm.h>
11 #include <linux/usb.h>
12
13 #include "as102_drv.h"
14 #include "as102_usb_drv.h"
15 #include "as102_fw.h"
16
17 static void as102_usb_disconnect(struct usb_interface *interface);
18 static int as102_usb_probe(struct usb_interface *interface,
19 const struct usb_device_id *id);
20
21 static int as102_usb_start_stream(struct as102_dev_t *dev);
22 static void as102_usb_stop_stream(struct as102_dev_t *dev);
23
24 static int as102_open(struct inode *inode, struct file *file);
25 static int as102_release(struct inode *inode, struct file *file);
26
27 static const struct usb_device_id as102_usb_id_table[] = {
28 { USB_DEVICE(AS102_USB_DEVICE_VENDOR_ID, AS102_USB_DEVICE_PID_0001) },
29 { USB_DEVICE(PCTV_74E_USB_VID, PCTV_74E_USB_PID) },
30 { USB_DEVICE(ELGATO_EYETV_DTT_USB_VID, ELGATO_EYETV_DTT_USB_PID) },
31 { USB_DEVICE(NBOX_DVBT_DONGLE_USB_VID, NBOX_DVBT_DONGLE_USB_PID) },
32 { USB_DEVICE(SKY_IT_DIGITAL_KEY_USB_VID, SKY_IT_DIGITAL_KEY_USB_PID) },
33 { } /* Terminating entry */
34 };
35
36 /* Note that this table must always have the same number of entries as the
37 as102_usb_id_table struct */
38 static const char * const as102_device_names[] = {
39 AS102_REFERENCE_DESIGN,
40 AS102_PCTV_74E,
41 AS102_ELGATO_EYETV_DTT_NAME,
42 AS102_NBOX_DVBT_DONGLE_NAME,
43 AS102_SKY_IT_DIGITAL_KEY_NAME,
44 NULL /* Terminating entry */
45 };
46
47 /* eLNA configuration: devices built on the reference design work best
48 with 0xA0, while custom designs seem to require 0xC0 */
49 static uint8_t const as102_elna_cfg[] = {
50 0xA0,
51 0xC0,
52 0xC0,
53 0xA0,
54 0xA0,
55 0x00 /* Terminating entry */
56 };
57
58 struct usb_driver as102_usb_driver = {
59 .name = DRIVER_FULL_NAME,
60 .probe = as102_usb_probe,
61 .disconnect = as102_usb_disconnect,
62 .id_table = as102_usb_id_table
63 };
64
65 static const struct file_operations as102_dev_fops = {
66 .owner = THIS_MODULE,
67 .open = as102_open,
68 .release = as102_release,
69 };
70
71 static struct usb_class_driver as102_usb_class_driver = {
72 .name = "aton2-%d",
73 .fops = &as102_dev_fops,
74 .minor_base = AS102_DEVICE_MAJOR,
75 };
76
as102_usb_xfer_cmd(struct as10x_bus_adapter_t * bus_adap,unsigned char * send_buf,int send_buf_len,unsigned char * recv_buf,int recv_buf_len)77 static int as102_usb_xfer_cmd(struct as10x_bus_adapter_t *bus_adap,
78 unsigned char *send_buf, int send_buf_len,
79 unsigned char *recv_buf, int recv_buf_len)
80 {
81 int ret = 0;
82
83 if (send_buf != NULL) {
84 ret = usb_control_msg(bus_adap->usb_dev,
85 usb_sndctrlpipe(bus_adap->usb_dev, 0),
86 AS102_USB_DEVICE_TX_CTRL_CMD,
87 USB_DIR_OUT | USB_TYPE_VENDOR |
88 USB_RECIP_DEVICE,
89 bus_adap->cmd_xid, /* value */
90 0, /* index */
91 send_buf, send_buf_len,
92 USB_CTRL_SET_TIMEOUT /* 200 */);
93 if (ret < 0) {
94 dev_dbg(&bus_adap->usb_dev->dev,
95 "usb_control_msg(send) failed, err %i\n", ret);
96 return ret;
97 }
98
99 if (ret != send_buf_len) {
100 dev_dbg(&bus_adap->usb_dev->dev,
101 "only wrote %d of %d bytes\n", ret, send_buf_len);
102 return -1;
103 }
104 }
105
106 if (recv_buf != NULL) {
107 #ifdef TRACE
108 dev_dbg(bus_adap->usb_dev->dev,
109 "want to read: %d bytes\n", recv_buf_len);
110 #endif
111 ret = usb_control_msg(bus_adap->usb_dev,
112 usb_rcvctrlpipe(bus_adap->usb_dev, 0),
113 AS102_USB_DEVICE_RX_CTRL_CMD,
114 USB_DIR_IN | USB_TYPE_VENDOR |
115 USB_RECIP_DEVICE,
116 bus_adap->cmd_xid, /* value */
117 0, /* index */
118 recv_buf, recv_buf_len,
119 USB_CTRL_GET_TIMEOUT /* 200 */);
120 if (ret < 0) {
121 dev_dbg(&bus_adap->usb_dev->dev,
122 "usb_control_msg(recv) failed, err %i\n", ret);
123 return ret;
124 }
125 #ifdef TRACE
126 dev_dbg(bus_adap->usb_dev->dev,
127 "read %d bytes\n", recv_buf_len);
128 #endif
129 }
130
131 return ret;
132 }
133
as102_send_ep1(struct as10x_bus_adapter_t * bus_adap,unsigned char * send_buf,int send_buf_len,int swap32)134 static int as102_send_ep1(struct as10x_bus_adapter_t *bus_adap,
135 unsigned char *send_buf,
136 int send_buf_len,
137 int swap32)
138 {
139 int ret, actual_len;
140
141 ret = usb_bulk_msg(bus_adap->usb_dev,
142 usb_sndbulkpipe(bus_adap->usb_dev, 1),
143 send_buf, send_buf_len, &actual_len, 200);
144 if (ret) {
145 dev_dbg(&bus_adap->usb_dev->dev,
146 "usb_bulk_msg(send) failed, err %i\n", ret);
147 return ret;
148 }
149
150 if (actual_len != send_buf_len) {
151 dev_dbg(&bus_adap->usb_dev->dev, "only wrote %d of %d bytes\n",
152 actual_len, send_buf_len);
153 return -1;
154 }
155 return actual_len;
156 }
157
as102_read_ep2(struct as10x_bus_adapter_t * bus_adap,unsigned char * recv_buf,int recv_buf_len)158 static int as102_read_ep2(struct as10x_bus_adapter_t *bus_adap,
159 unsigned char *recv_buf, int recv_buf_len)
160 {
161 int ret, actual_len;
162
163 if (recv_buf == NULL)
164 return -EINVAL;
165
166 ret = usb_bulk_msg(bus_adap->usb_dev,
167 usb_rcvbulkpipe(bus_adap->usb_dev, 2),
168 recv_buf, recv_buf_len, &actual_len, 200);
169 if (ret) {
170 dev_dbg(&bus_adap->usb_dev->dev,
171 "usb_bulk_msg(recv) failed, err %i\n", ret);
172 return ret;
173 }
174
175 if (actual_len != recv_buf_len) {
176 dev_dbg(&bus_adap->usb_dev->dev, "only read %d of %d bytes\n",
177 actual_len, recv_buf_len);
178 return -1;
179 }
180 return actual_len;
181 }
182
183 static const struct as102_priv_ops_t as102_priv_ops = {
184 .upload_fw_pkt = as102_send_ep1,
185 .xfer_cmd = as102_usb_xfer_cmd,
186 .as102_read_ep2 = as102_read_ep2,
187 .start_stream = as102_usb_start_stream,
188 .stop_stream = as102_usb_stop_stream,
189 };
190
as102_submit_urb_stream(struct as102_dev_t * dev,struct urb * urb)191 static int as102_submit_urb_stream(struct as102_dev_t *dev, struct urb *urb)
192 {
193 int err;
194
195 usb_fill_bulk_urb(urb,
196 dev->bus_adap.usb_dev,
197 usb_rcvbulkpipe(dev->bus_adap.usb_dev, 0x2),
198 urb->transfer_buffer,
199 AS102_USB_BUF_SIZE,
200 as102_urb_stream_irq,
201 dev);
202
203 err = usb_submit_urb(urb, GFP_ATOMIC);
204 if (err)
205 dev_dbg(&urb->dev->dev,
206 "%s: usb_submit_urb failed\n", __func__);
207
208 return err;
209 }
210
as102_urb_stream_irq(struct urb * urb)211 void as102_urb_stream_irq(struct urb *urb)
212 {
213 struct as102_dev_t *as102_dev = urb->context;
214
215 if (urb->actual_length > 0) {
216 dvb_dmx_swfilter(&as102_dev->dvb_dmx,
217 urb->transfer_buffer,
218 urb->actual_length);
219 } else {
220 if (urb->actual_length == 0)
221 memset(urb->transfer_buffer, 0, AS102_USB_BUF_SIZE);
222 }
223
224 /* is not stopped, re-submit urb */
225 if (as102_dev->streaming)
226 as102_submit_urb_stream(as102_dev, urb);
227 }
228
as102_free_usb_stream_buffer(struct as102_dev_t * dev)229 static void as102_free_usb_stream_buffer(struct as102_dev_t *dev)
230 {
231 int i;
232
233 for (i = 0; i < MAX_STREAM_URB; i++)
234 usb_free_urb(dev->stream_urb[i]);
235
236 usb_free_coherent(dev->bus_adap.usb_dev,
237 MAX_STREAM_URB * AS102_USB_BUF_SIZE,
238 dev->stream,
239 dev->dma_addr);
240 }
241
as102_alloc_usb_stream_buffer(struct as102_dev_t * dev)242 static int as102_alloc_usb_stream_buffer(struct as102_dev_t *dev)
243 {
244 int i;
245
246 dev->stream = usb_alloc_coherent(dev->bus_adap.usb_dev,
247 MAX_STREAM_URB * AS102_USB_BUF_SIZE,
248 GFP_KERNEL,
249 &dev->dma_addr);
250 if (!dev->stream) {
251 dev_dbg(&dev->bus_adap.usb_dev->dev,
252 "%s: usb_buffer_alloc failed\n", __func__);
253 return -ENOMEM;
254 }
255
256 memset(dev->stream, 0, MAX_STREAM_URB * AS102_USB_BUF_SIZE);
257
258 /* init urb buffers */
259 for (i = 0; i < MAX_STREAM_URB; i++) {
260 struct urb *urb;
261
262 urb = usb_alloc_urb(0, GFP_KERNEL);
263 if (urb == NULL) {
264 as102_free_usb_stream_buffer(dev);
265 return -ENOMEM;
266 }
267
268 urb->transfer_buffer = dev->stream + (i * AS102_USB_BUF_SIZE);
269 urb->transfer_dma = dev->dma_addr + (i * AS102_USB_BUF_SIZE);
270 urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
271 urb->transfer_buffer_length = AS102_USB_BUF_SIZE;
272
273 dev->stream_urb[i] = urb;
274 }
275 return 0;
276 }
277
as102_usb_stop_stream(struct as102_dev_t * dev)278 static void as102_usb_stop_stream(struct as102_dev_t *dev)
279 {
280 int i;
281
282 for (i = 0; i < MAX_STREAM_URB; i++)
283 usb_kill_urb(dev->stream_urb[i]);
284 }
285
as102_usb_start_stream(struct as102_dev_t * dev)286 static int as102_usb_start_stream(struct as102_dev_t *dev)
287 {
288 int i, ret = 0;
289
290 for (i = 0; i < MAX_STREAM_URB; i++) {
291 ret = as102_submit_urb_stream(dev, dev->stream_urb[i]);
292 if (ret) {
293 as102_usb_stop_stream(dev);
294 return ret;
295 }
296 }
297
298 return 0;
299 }
300
as102_usb_release(struct kref * kref)301 static void as102_usb_release(struct kref *kref)
302 {
303 struct as102_dev_t *as102_dev;
304
305 as102_dev = container_of(kref, struct as102_dev_t, kref);
306 usb_put_dev(as102_dev->bus_adap.usb_dev);
307 kfree(as102_dev);
308 }
309
as102_usb_disconnect(struct usb_interface * intf)310 static void as102_usb_disconnect(struct usb_interface *intf)
311 {
312 struct as102_dev_t *as102_dev;
313
314 /* extract as102_dev_t from usb_device private data */
315 as102_dev = usb_get_intfdata(intf);
316
317 /* unregister dvb layer */
318 as102_dvb_unregister(as102_dev);
319
320 /* free usb buffers */
321 as102_free_usb_stream_buffer(as102_dev);
322
323 usb_set_intfdata(intf, NULL);
324
325 /* usb unregister device */
326 usb_deregister_dev(intf, &as102_usb_class_driver);
327
328 /* decrement usage counter */
329 kref_put(&as102_dev->kref, as102_usb_release);
330
331 pr_info("%s: device has been disconnected\n", DRIVER_NAME);
332 }
333
as102_usb_probe(struct usb_interface * intf,const struct usb_device_id * id)334 static int as102_usb_probe(struct usb_interface *intf,
335 const struct usb_device_id *id)
336 {
337 int ret;
338 struct as102_dev_t *as102_dev;
339 int i;
340
341 /* This should never actually happen */
342 if (ARRAY_SIZE(as102_usb_id_table) !=
343 (sizeof(as102_device_names) / sizeof(const char *))) {
344 pr_err("Device names table invalid size");
345 return -EINVAL;
346 }
347
348 as102_dev = kzalloc(sizeof(struct as102_dev_t), GFP_KERNEL);
349 if (as102_dev == NULL)
350 return -ENOMEM;
351
352 /* Assign the user-friendly device name */
353 for (i = 0; i < ARRAY_SIZE(as102_usb_id_table); i++) {
354 if (id == &as102_usb_id_table[i]) {
355 as102_dev->name = as102_device_names[i];
356 as102_dev->elna_cfg = as102_elna_cfg[i];
357 }
358 }
359
360 if (as102_dev->name == NULL)
361 as102_dev->name = "Unknown AS102 device";
362
363 /* set private callback functions */
364 as102_dev->bus_adap.ops = &as102_priv_ops;
365
366 /* init cmd token for usb bus */
367 as102_dev->bus_adap.cmd = &as102_dev->bus_adap.token.usb.c;
368 as102_dev->bus_adap.rsp = &as102_dev->bus_adap.token.usb.r;
369
370 /* init kernel device reference */
371 kref_init(&as102_dev->kref);
372
373 /* store as102 device to usb_device private data */
374 usb_set_intfdata(intf, (void *) as102_dev);
375
376 /* store in as102 device the usb_device pointer */
377 as102_dev->bus_adap.usb_dev = usb_get_dev(interface_to_usbdev(intf));
378
379 /* we can register the device now, as it is ready */
380 ret = usb_register_dev(intf, &as102_usb_class_driver);
381 if (ret < 0) {
382 /* something prevented us from registering this driver */
383 dev_err(&intf->dev,
384 "%s: usb_register_dev() failed (errno = %d)\n",
385 __func__, ret);
386 goto failed;
387 }
388
389 pr_info("%s: device has been detected\n", DRIVER_NAME);
390
391 /* request buffer allocation for streaming */
392 ret = as102_alloc_usb_stream_buffer(as102_dev);
393 if (ret != 0)
394 goto failed_stream;
395
396 /* register dvb layer */
397 ret = as102_dvb_register(as102_dev);
398 if (ret != 0)
399 goto failed_dvb;
400
401 return ret;
402
403 failed_dvb:
404 as102_free_usb_stream_buffer(as102_dev);
405 failed_stream:
406 usb_deregister_dev(intf, &as102_usb_class_driver);
407 failed:
408 usb_put_dev(as102_dev->bus_adap.usb_dev);
409 usb_set_intfdata(intf, NULL);
410 kfree(as102_dev);
411 return ret;
412 }
413
as102_open(struct inode * inode,struct file * file)414 static int as102_open(struct inode *inode, struct file *file)
415 {
416 int ret = 0, minor = 0;
417 struct usb_interface *intf = NULL;
418 struct as102_dev_t *dev = NULL;
419
420 /* read minor from inode */
421 minor = iminor(inode);
422
423 /* fetch device from usb interface */
424 intf = usb_find_interface(&as102_usb_driver, minor);
425 if (intf == NULL) {
426 pr_err("%s: can't find device for minor %d\n",
427 __func__, minor);
428 ret = -ENODEV;
429 goto exit;
430 }
431
432 /* get our device */
433 dev = usb_get_intfdata(intf);
434 if (dev == NULL) {
435 ret = -EFAULT;
436 goto exit;
437 }
438
439 /* save our device object in the file's private structure */
440 file->private_data = dev;
441
442 /* increment our usage count for the device */
443 kref_get(&dev->kref);
444
445 exit:
446 return ret;
447 }
448
as102_release(struct inode * inode,struct file * file)449 static int as102_release(struct inode *inode, struct file *file)
450 {
451 struct as102_dev_t *dev = NULL;
452
453 dev = file->private_data;
454 if (dev != NULL) {
455 /* decrement the count on our device */
456 kref_put(&dev->kref, as102_usb_release);
457 }
458
459 return 0;
460 }
461
462 MODULE_DEVICE_TABLE(usb, as102_usb_id_table);
463