1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Jeilin JL2005B/C/D library
4  *
5  * Copyright (C) 2011 Theodore Kilgore <kilgota@auburn.edu>
6  */
7 
8 #define MODULE_NAME "jl2005bcd"
9 
10 #include <linux/workqueue.h>
11 #include <linux/slab.h>
12 #include "gspca.h"
13 
14 
15 MODULE_AUTHOR("Theodore Kilgore <kilgota@auburn.edu>");
16 MODULE_DESCRIPTION("JL2005B/C/D USB Camera Driver");
17 MODULE_LICENSE("GPL");
18 
19 /* Default timeouts, in ms */
20 #define JL2005C_CMD_TIMEOUT 500
21 #define JL2005C_DATA_TIMEOUT 1000
22 
23 /* Maximum transfer size to use. */
24 #define JL2005C_MAX_TRANSFER 0x200
25 #define FRAME_HEADER_LEN 16
26 
27 
28 /* specific webcam descriptor */
29 struct sd {
30 	struct gspca_dev gspca_dev;  /* !! must be the first item */
31 	unsigned char firmware_id[6];
32 	const struct v4l2_pix_format *cap_mode;
33 	/* Driver stuff */
34 	struct work_struct work_struct;
35 	u8 frame_brightness;
36 	int block_size;	/* block size of camera */
37 	int vga;	/* 1 if vga cam, 0 if cif cam */
38 };
39 
40 
41 /* Camera has two resolution settings. What they are depends on model. */
42 static const struct v4l2_pix_format cif_mode[] = {
43 	{176, 144, V4L2_PIX_FMT_JL2005BCD, V4L2_FIELD_NONE,
44 		.bytesperline = 176,
45 		.sizeimage = 176 * 144,
46 		.colorspace = V4L2_COLORSPACE_SRGB,
47 		.priv = 0},
48 	{352, 288, V4L2_PIX_FMT_JL2005BCD, V4L2_FIELD_NONE,
49 		.bytesperline = 352,
50 		.sizeimage = 352 * 288,
51 		.colorspace = V4L2_COLORSPACE_SRGB,
52 		.priv = 0},
53 };
54 
55 static const struct v4l2_pix_format vga_mode[] = {
56 	{320, 240, V4L2_PIX_FMT_JL2005BCD, V4L2_FIELD_NONE,
57 		.bytesperline = 320,
58 		.sizeimage = 320 * 240,
59 		.colorspace = V4L2_COLORSPACE_SRGB,
60 		.priv = 0},
61 	{640, 480, V4L2_PIX_FMT_JL2005BCD, V4L2_FIELD_NONE,
62 		.bytesperline = 640,
63 		.sizeimage = 640 * 480,
64 		.colorspace = V4L2_COLORSPACE_SRGB,
65 		.priv = 0},
66 };
67 
68 /*
69  * cam uses endpoint 0x03 to send commands, 0x84 for read commands,
70  * and 0x82 for bulk data transfer.
71  */
72 
73 /* All commands are two bytes only */
jl2005c_write2(struct gspca_dev * gspca_dev,unsigned char * command)74 static int jl2005c_write2(struct gspca_dev *gspca_dev, unsigned char *command)
75 {
76 	int retval;
77 
78 	memcpy(gspca_dev->usb_buf, command, 2);
79 	retval = usb_bulk_msg(gspca_dev->dev,
80 			usb_sndbulkpipe(gspca_dev->dev, 3),
81 			gspca_dev->usb_buf, 2, NULL, 500);
82 	if (retval < 0)
83 		pr_err("command write [%02x] error %d\n",
84 		       gspca_dev->usb_buf[0], retval);
85 	return retval;
86 }
87 
88 /* Response to a command is one byte in usb_buf[0], only if requested. */
jl2005c_read1(struct gspca_dev * gspca_dev)89 static int jl2005c_read1(struct gspca_dev *gspca_dev)
90 {
91 	int retval;
92 
93 	retval = usb_bulk_msg(gspca_dev->dev,
94 				usb_rcvbulkpipe(gspca_dev->dev, 0x84),
95 				gspca_dev->usb_buf, 1, NULL, 500);
96 	if (retval < 0)
97 		pr_err("read command [0x%02x] error %d\n",
98 		       gspca_dev->usb_buf[0], retval);
99 	return retval;
100 }
101 
102 /* Response appears in gspca_dev->usb_buf[0] */
jl2005c_read_reg(struct gspca_dev * gspca_dev,unsigned char reg)103 static int jl2005c_read_reg(struct gspca_dev *gspca_dev, unsigned char reg)
104 {
105 	int retval;
106 
107 	static u8 instruction[2] = {0x95, 0x00};
108 	/* put register to read in byte 1 */
109 	instruction[1] = reg;
110 	/* Send the read request */
111 	retval = jl2005c_write2(gspca_dev, instruction);
112 	if (retval < 0)
113 		return retval;
114 	retval = jl2005c_read1(gspca_dev);
115 
116 	return retval;
117 }
118 
jl2005c_start_new_frame(struct gspca_dev * gspca_dev)119 static int jl2005c_start_new_frame(struct gspca_dev *gspca_dev)
120 {
121 	int i;
122 	int retval;
123 	int frame_brightness = 0;
124 
125 	static u8 instruction[2] = {0x7f, 0x01};
126 
127 	retval = jl2005c_write2(gspca_dev, instruction);
128 	if (retval < 0)
129 		return retval;
130 
131 	i = 0;
132 	while (i < 20 && !frame_brightness) {
133 		/* If we tried 20 times, give up. */
134 		retval = jl2005c_read_reg(gspca_dev, 0x7e);
135 		if (retval < 0)
136 			return retval;
137 		frame_brightness = gspca_dev->usb_buf[0];
138 		retval = jl2005c_read_reg(gspca_dev, 0x7d);
139 		if (retval < 0)
140 			return retval;
141 		i++;
142 	}
143 	gspca_dbg(gspca_dev, D_FRAM, "frame_brightness is 0x%02x\n",
144 		  gspca_dev->usb_buf[0]);
145 	return retval;
146 }
147 
jl2005c_write_reg(struct gspca_dev * gspca_dev,unsigned char reg,unsigned char value)148 static int jl2005c_write_reg(struct gspca_dev *gspca_dev, unsigned char reg,
149 						    unsigned char value)
150 {
151 	int retval;
152 	u8 instruction[2];
153 
154 	instruction[0] = reg;
155 	instruction[1] = value;
156 
157 	retval = jl2005c_write2(gspca_dev, instruction);
158 	if (retval < 0)
159 			return retval;
160 
161 	return retval;
162 }
163 
jl2005c_get_firmware_id(struct gspca_dev * gspca_dev)164 static int jl2005c_get_firmware_id(struct gspca_dev *gspca_dev)
165 {
166 	struct sd *sd = (struct sd *)gspca_dev;
167 	int i = 0;
168 	int retval;
169 	static const unsigned char regs_to_read[] = {
170 		0x57, 0x02, 0x03, 0x5d, 0x5e, 0x5f
171 	};
172 
173 	gspca_dbg(gspca_dev, D_PROBE, "Running jl2005c_get_firmware_id\n");
174 	/* Read the first ID byte once for warmup */
175 	retval = jl2005c_read_reg(gspca_dev, regs_to_read[0]);
176 	gspca_dbg(gspca_dev, D_PROBE, "response is %02x\n",
177 		  gspca_dev->usb_buf[0]);
178 	if (retval < 0)
179 		return retval;
180 	/* Now actually get the ID string */
181 	for (i = 0; i < 6; i++) {
182 		retval = jl2005c_read_reg(gspca_dev, regs_to_read[i]);
183 		if (retval < 0)
184 			return retval;
185 		sd->firmware_id[i] = gspca_dev->usb_buf[0];
186 	}
187 	gspca_dbg(gspca_dev, D_PROBE, "firmware ID is %02x%02x%02x%02x%02x%02x\n",
188 		  sd->firmware_id[0],
189 		  sd->firmware_id[1],
190 		  sd->firmware_id[2],
191 		  sd->firmware_id[3],
192 		  sd->firmware_id[4],
193 		  sd->firmware_id[5]);
194 	return 0;
195 }
196 
jl2005c_stream_start_vga_lg(struct gspca_dev * gspca_dev)197 static int jl2005c_stream_start_vga_lg
198 		    (struct gspca_dev *gspca_dev)
199 {
200 	int i;
201 	int retval = -1;
202 	static u8 instruction[][2] = {
203 		{0x05, 0x00},
204 		{0x7c, 0x00},
205 		{0x7d, 0x18},
206 		{0x02, 0x00},
207 		{0x01, 0x00},
208 		{0x04, 0x52},
209 	};
210 
211 	for (i = 0; i < ARRAY_SIZE(instruction); i++) {
212 		msleep(60);
213 		retval = jl2005c_write2(gspca_dev, instruction[i]);
214 		if (retval < 0)
215 			return retval;
216 	}
217 	msleep(60);
218 	return retval;
219 }
220 
jl2005c_stream_start_vga_small(struct gspca_dev * gspca_dev)221 static int jl2005c_stream_start_vga_small(struct gspca_dev *gspca_dev)
222 {
223 	int i;
224 	int retval = -1;
225 	static u8 instruction[][2] = {
226 		{0x06, 0x00},
227 		{0x7c, 0x00},
228 		{0x7d, 0x1a},
229 		{0x02, 0x00},
230 		{0x01, 0x00},
231 		{0x04, 0x52},
232 	};
233 
234 	for (i = 0; i < ARRAY_SIZE(instruction); i++) {
235 		msleep(60);
236 		retval = jl2005c_write2(gspca_dev, instruction[i]);
237 		if (retval < 0)
238 			return retval;
239 	}
240 	msleep(60);
241 	return retval;
242 }
243 
jl2005c_stream_start_cif_lg(struct gspca_dev * gspca_dev)244 static int jl2005c_stream_start_cif_lg(struct gspca_dev *gspca_dev)
245 {
246 	int i;
247 	int retval = -1;
248 	static u8 instruction[][2] = {
249 		{0x05, 0x00},
250 		{0x7c, 0x00},
251 		{0x7d, 0x30},
252 		{0x02, 0x00},
253 		{0x01, 0x00},
254 		{0x04, 0x42},
255 	};
256 
257 	for (i = 0; i < ARRAY_SIZE(instruction); i++) {
258 		msleep(60);
259 		retval = jl2005c_write2(gspca_dev, instruction[i]);
260 		if (retval < 0)
261 			return retval;
262 	}
263 	msleep(60);
264 	return retval;
265 }
266 
jl2005c_stream_start_cif_small(struct gspca_dev * gspca_dev)267 static int jl2005c_stream_start_cif_small(struct gspca_dev *gspca_dev)
268 {
269 	int i;
270 	int retval = -1;
271 	static u8 instruction[][2] = {
272 		{0x06, 0x00},
273 		{0x7c, 0x00},
274 		{0x7d, 0x32},
275 		{0x02, 0x00},
276 		{0x01, 0x00},
277 		{0x04, 0x42},
278 	};
279 
280 	for (i = 0; i < ARRAY_SIZE(instruction); i++) {
281 		msleep(60);
282 		retval = jl2005c_write2(gspca_dev, instruction[i]);
283 		if (retval < 0)
284 			return retval;
285 	}
286 	msleep(60);
287 	return retval;
288 }
289 
290 
jl2005c_stop(struct gspca_dev * gspca_dev)291 static int jl2005c_stop(struct gspca_dev *gspca_dev)
292 {
293 	return jl2005c_write_reg(gspca_dev, 0x07, 0x00);
294 }
295 
296 /*
297  * This function is called as a workqueue function and runs whenever the camera
298  * is streaming data. Because it is a workqueue function it is allowed to sleep
299  * so we can use synchronous USB calls. To avoid possible collisions with other
300  * threads attempting to use gspca_dev->usb_buf we take the usb_lock when
301  * performing USB operations using it. In practice we don't really need this
302  * as the camera doesn't provide any controls.
303  */
jl2005c_dostream(struct work_struct * work)304 static void jl2005c_dostream(struct work_struct *work)
305 {
306 	struct sd *dev = container_of(work, struct sd, work_struct);
307 	struct gspca_dev *gspca_dev = &dev->gspca_dev;
308 	int bytes_left = 0; /* bytes remaining in current frame. */
309 	int data_len;   /* size to use for the next read. */
310 	int header_read = 0;
311 	unsigned char header_sig[2] = {0x4a, 0x4c};
312 	int act_len;
313 	int packet_type;
314 	int ret;
315 	u8 *buffer;
316 
317 	buffer = kmalloc(JL2005C_MAX_TRANSFER, GFP_KERNEL);
318 	if (!buffer) {
319 		pr_err("Couldn't allocate USB buffer\n");
320 		goto quit_stream;
321 	}
322 
323 	while (gspca_dev->present && gspca_dev->streaming) {
324 #ifdef CONFIG_PM
325 		if (gspca_dev->frozen)
326 			break;
327 #endif
328 		/* Check if this is a new frame. If so, start the frame first */
329 		if (!header_read) {
330 			mutex_lock(&gspca_dev->usb_lock);
331 			ret = jl2005c_start_new_frame(gspca_dev);
332 			mutex_unlock(&gspca_dev->usb_lock);
333 			if (ret < 0)
334 				goto quit_stream;
335 			ret = usb_bulk_msg(gspca_dev->dev,
336 				usb_rcvbulkpipe(gspca_dev->dev, 0x82),
337 				buffer, JL2005C_MAX_TRANSFER, &act_len,
338 				JL2005C_DATA_TIMEOUT);
339 			gspca_dbg(gspca_dev, D_PACK,
340 				  "Got %d bytes out of %d for header\n",
341 				  act_len, JL2005C_MAX_TRANSFER);
342 			if (ret < 0 || act_len < JL2005C_MAX_TRANSFER)
343 				goto quit_stream;
344 			/* Check whether we actually got the first blodk */
345 			if (memcmp(header_sig, buffer, 2) != 0) {
346 				pr_err("First block is not the first block\n");
347 				goto quit_stream;
348 			}
349 			/* total size to fetch is byte 7, times blocksize
350 			 * of which we already got act_len */
351 			bytes_left = buffer[0x07] * dev->block_size - act_len;
352 			gspca_dbg(gspca_dev, D_PACK, "bytes_left = 0x%x\n",
353 				  bytes_left);
354 			/* We keep the header. It has other information, too.*/
355 			packet_type = FIRST_PACKET;
356 			gspca_frame_add(gspca_dev, packet_type,
357 					buffer, act_len);
358 			header_read = 1;
359 		}
360 		while (bytes_left > 0 && gspca_dev->present) {
361 			data_len = bytes_left > JL2005C_MAX_TRANSFER ?
362 				JL2005C_MAX_TRANSFER : bytes_left;
363 			ret = usb_bulk_msg(gspca_dev->dev,
364 				usb_rcvbulkpipe(gspca_dev->dev, 0x82),
365 				buffer, data_len, &act_len,
366 				JL2005C_DATA_TIMEOUT);
367 			if (ret < 0 || act_len < data_len)
368 				goto quit_stream;
369 			gspca_dbg(gspca_dev, D_PACK,
370 				  "Got %d bytes out of %d for frame\n",
371 				  data_len, bytes_left);
372 			bytes_left -= data_len;
373 			if (bytes_left == 0) {
374 				packet_type = LAST_PACKET;
375 				header_read = 0;
376 			} else
377 				packet_type = INTER_PACKET;
378 			gspca_frame_add(gspca_dev, packet_type,
379 					buffer, data_len);
380 		}
381 	}
382 quit_stream:
383 	if (gspca_dev->present) {
384 		mutex_lock(&gspca_dev->usb_lock);
385 		jl2005c_stop(gspca_dev);
386 		mutex_unlock(&gspca_dev->usb_lock);
387 	}
388 	kfree(buffer);
389 }
390 
391 
392 
393 
394 /* This function is called at probe time */
sd_config(struct gspca_dev * gspca_dev,const struct usb_device_id * id)395 static int sd_config(struct gspca_dev *gspca_dev,
396 			const struct usb_device_id *id)
397 {
398 	struct cam *cam;
399 	struct sd *sd = (struct sd *) gspca_dev;
400 
401 	cam = &gspca_dev->cam;
402 	/* We don't use the buffer gspca allocates so make it small. */
403 	cam->bulk_size = 64;
404 	cam->bulk = 1;
405 	/* For the rest, the camera needs to be detected */
406 	jl2005c_get_firmware_id(gspca_dev);
407 	/* Here are some known firmware IDs
408 	 * First some JL2005B cameras
409 	 * {0x41, 0x07, 0x04, 0x2c, 0xe8, 0xf2}	Sakar KidzCam
410 	 * {0x45, 0x02, 0x08, 0xb9, 0x00, 0xd2}	No-name JL2005B
411 	 * JL2005C cameras
412 	 * {0x01, 0x0c, 0x16, 0x10, 0xf8, 0xc8}	Argus DC-1512
413 	 * {0x12, 0x04, 0x03, 0xc0, 0x00, 0xd8}	ICarly
414 	 * {0x86, 0x08, 0x05, 0x02, 0x00, 0xd4}	Jazz
415 	 *
416 	 * Based upon this scanty evidence, we can detect a CIF camera by
417 	 * testing byte 0 for 0x4x.
418 	 */
419 	if ((sd->firmware_id[0] & 0xf0) == 0x40) {
420 		cam->cam_mode	= cif_mode;
421 		cam->nmodes	= ARRAY_SIZE(cif_mode);
422 		sd->block_size	= 0x80;
423 	} else {
424 		cam->cam_mode	= vga_mode;
425 		cam->nmodes	= ARRAY_SIZE(vga_mode);
426 		sd->block_size	= 0x200;
427 	}
428 
429 	INIT_WORK(&sd->work_struct, jl2005c_dostream);
430 
431 	return 0;
432 }
433 
434 /* this function is called at probe and resume time */
sd_init(struct gspca_dev * gspca_dev)435 static int sd_init(struct gspca_dev *gspca_dev)
436 {
437 	return 0;
438 }
439 
sd_start(struct gspca_dev * gspca_dev)440 static int sd_start(struct gspca_dev *gspca_dev)
441 {
442 
443 	struct sd *sd = (struct sd *) gspca_dev;
444 	sd->cap_mode = gspca_dev->cam.cam_mode;
445 
446 	switch (gspca_dev->pixfmt.width) {
447 	case 640:
448 		gspca_dbg(gspca_dev, D_STREAM, "Start streaming at vga resolution\n");
449 		jl2005c_stream_start_vga_lg(gspca_dev);
450 		break;
451 	case 320:
452 		gspca_dbg(gspca_dev, D_STREAM, "Start streaming at qvga resolution\n");
453 		jl2005c_stream_start_vga_small(gspca_dev);
454 		break;
455 	case 352:
456 		gspca_dbg(gspca_dev, D_STREAM, "Start streaming at cif resolution\n");
457 		jl2005c_stream_start_cif_lg(gspca_dev);
458 		break;
459 	case 176:
460 		gspca_dbg(gspca_dev, D_STREAM, "Start streaming at qcif resolution\n");
461 		jl2005c_stream_start_cif_small(gspca_dev);
462 		break;
463 	default:
464 		pr_err("Unknown resolution specified\n");
465 		return -1;
466 	}
467 
468 	schedule_work(&sd->work_struct);
469 
470 	return 0;
471 }
472 
473 /* called on streamoff with alt==0 and on disconnect */
474 /* the usb_lock is held at entry - restore on exit */
sd_stop0(struct gspca_dev * gspca_dev)475 static void sd_stop0(struct gspca_dev *gspca_dev)
476 {
477 	struct sd *dev = (struct sd *) gspca_dev;
478 
479 	/* wait for the work queue to terminate */
480 	mutex_unlock(&gspca_dev->usb_lock);
481 	/* This waits for sq905c_dostream to finish */
482 	flush_work(&dev->work_struct);
483 	mutex_lock(&gspca_dev->usb_lock);
484 }
485 
486 
487 
488 /* sub-driver description */
489 static const struct sd_desc sd_desc = {
490 	.name = MODULE_NAME,
491 	.config = sd_config,
492 	.init = sd_init,
493 	.start = sd_start,
494 	.stop0 = sd_stop0,
495 };
496 
497 /* -- module initialisation -- */
498 static const struct usb_device_id device_table[] = {
499 	{USB_DEVICE(0x0979, 0x0227)},
500 	{}
501 };
502 MODULE_DEVICE_TABLE(usb, device_table);
503 
504 /* -- device connect -- */
sd_probe(struct usb_interface * intf,const struct usb_device_id * id)505 static int sd_probe(struct usb_interface *intf,
506 				const struct usb_device_id *id)
507 {
508 	return gspca_dev_probe(intf, id, &sd_desc, sizeof(struct sd),
509 				THIS_MODULE);
510 }
511 
512 static struct usb_driver sd_driver = {
513 	.name = MODULE_NAME,
514 	.id_table = device_table,
515 	.probe = sd_probe,
516 	.disconnect = gspca_disconnect,
517 #ifdef CONFIG_PM
518 	.suspend = gspca_suspend,
519 	.resume = gspca_resume,
520 	.reset_resume = gspca_resume,
521 #endif
522 };
523 
524 module_usb_driver(sd_driver);
525