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 */
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. */
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] */
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 
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 
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 
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 = -1;
169 	unsigned char regs_to_read[] = {0x57, 0x02, 0x03, 0x5d, 0x5e, 0x5f};
170 
171 	gspca_dbg(gspca_dev, D_PROBE, "Running jl2005c_get_firmware_id\n");
172 	/* Read the first ID byte once for warmup */
173 	retval = jl2005c_read_reg(gspca_dev, regs_to_read[0]);
174 	gspca_dbg(gspca_dev, D_PROBE, "response is %02x\n",
175 		  gspca_dev->usb_buf[0]);
176 	if (retval < 0)
177 		return retval;
178 	/* Now actually get the ID string */
179 	for (i = 0; i < 6; i++) {
180 		retval = jl2005c_read_reg(gspca_dev, regs_to_read[i]);
181 		if (retval < 0)
182 			return retval;
183 		sd->firmware_id[i] = gspca_dev->usb_buf[0];
184 	}
185 	gspca_dbg(gspca_dev, D_PROBE, "firmware ID is %02x%02x%02x%02x%02x%02x\n",
186 		  sd->firmware_id[0],
187 		  sd->firmware_id[1],
188 		  sd->firmware_id[2],
189 		  sd->firmware_id[3],
190 		  sd->firmware_id[4],
191 		  sd->firmware_id[5]);
192 	return 0;
193 }
194 
195 static int jl2005c_stream_start_vga_lg
196 		    (struct gspca_dev *gspca_dev)
197 {
198 	int i;
199 	int retval = -1;
200 	static u8 instruction[][2] = {
201 		{0x05, 0x00},
202 		{0x7c, 0x00},
203 		{0x7d, 0x18},
204 		{0x02, 0x00},
205 		{0x01, 0x00},
206 		{0x04, 0x52},
207 	};
208 
209 	for (i = 0; i < ARRAY_SIZE(instruction); i++) {
210 		msleep(60);
211 		retval = jl2005c_write2(gspca_dev, instruction[i]);
212 		if (retval < 0)
213 			return retval;
214 	}
215 	msleep(60);
216 	return retval;
217 }
218 
219 static int jl2005c_stream_start_vga_small(struct gspca_dev *gspca_dev)
220 {
221 	int i;
222 	int retval = -1;
223 	static u8 instruction[][2] = {
224 		{0x06, 0x00},
225 		{0x7c, 0x00},
226 		{0x7d, 0x1a},
227 		{0x02, 0x00},
228 		{0x01, 0x00},
229 		{0x04, 0x52},
230 	};
231 
232 	for (i = 0; i < ARRAY_SIZE(instruction); i++) {
233 		msleep(60);
234 		retval = jl2005c_write2(gspca_dev, instruction[i]);
235 		if (retval < 0)
236 			return retval;
237 	}
238 	msleep(60);
239 	return retval;
240 }
241 
242 static int jl2005c_stream_start_cif_lg(struct gspca_dev *gspca_dev)
243 {
244 	int i;
245 	int retval = -1;
246 	static u8 instruction[][2] = {
247 		{0x05, 0x00},
248 		{0x7c, 0x00},
249 		{0x7d, 0x30},
250 		{0x02, 0x00},
251 		{0x01, 0x00},
252 		{0x04, 0x42},
253 	};
254 
255 	for (i = 0; i < ARRAY_SIZE(instruction); i++) {
256 		msleep(60);
257 		retval = jl2005c_write2(gspca_dev, instruction[i]);
258 		if (retval < 0)
259 			return retval;
260 	}
261 	msleep(60);
262 	return retval;
263 }
264 
265 static int jl2005c_stream_start_cif_small(struct gspca_dev *gspca_dev)
266 {
267 	int i;
268 	int retval = -1;
269 	static u8 instruction[][2] = {
270 		{0x06, 0x00},
271 		{0x7c, 0x00},
272 		{0x7d, 0x32},
273 		{0x02, 0x00},
274 		{0x01, 0x00},
275 		{0x04, 0x42},
276 	};
277 
278 	for (i = 0; i < ARRAY_SIZE(instruction); i++) {
279 		msleep(60);
280 		retval = jl2005c_write2(gspca_dev, instruction[i]);
281 		if (retval < 0)
282 			return retval;
283 	}
284 	msleep(60);
285 	return retval;
286 }
287 
288 
289 static int jl2005c_stop(struct gspca_dev *gspca_dev)
290 {
291 	return jl2005c_write_reg(gspca_dev, 0x07, 0x00);
292 }
293 
294 /*
295  * This function is called as a workqueue function and runs whenever the camera
296  * is streaming data. Because it is a workqueue function it is allowed to sleep
297  * so we can use synchronous USB calls. To avoid possible collisions with other
298  * threads attempting to use gspca_dev->usb_buf we take the usb_lock when
299  * performing USB operations using it. In practice we don't really need this
300  * as the camera doesn't provide any controls.
301  */
302 static void jl2005c_dostream(struct work_struct *work)
303 {
304 	struct sd *dev = container_of(work, struct sd, work_struct);
305 	struct gspca_dev *gspca_dev = &dev->gspca_dev;
306 	int bytes_left = 0; /* bytes remaining in current frame. */
307 	int data_len;   /* size to use for the next read. */
308 	int header_read = 0;
309 	unsigned char header_sig[2] = {0x4a, 0x4c};
310 	int act_len;
311 	int packet_type;
312 	int ret;
313 	u8 *buffer;
314 
315 	buffer = kmalloc(JL2005C_MAX_TRANSFER, GFP_KERNEL);
316 	if (!buffer) {
317 		pr_err("Couldn't allocate USB buffer\n");
318 		goto quit_stream;
319 	}
320 
321 	while (gspca_dev->present && gspca_dev->streaming) {
322 #ifdef CONFIG_PM
323 		if (gspca_dev->frozen)
324 			break;
325 #endif
326 		/* Check if this is a new frame. If so, start the frame first */
327 		if (!header_read) {
328 			mutex_lock(&gspca_dev->usb_lock);
329 			ret = jl2005c_start_new_frame(gspca_dev);
330 			mutex_unlock(&gspca_dev->usb_lock);
331 			if (ret < 0)
332 				goto quit_stream;
333 			ret = usb_bulk_msg(gspca_dev->dev,
334 				usb_rcvbulkpipe(gspca_dev->dev, 0x82),
335 				buffer, JL2005C_MAX_TRANSFER, &act_len,
336 				JL2005C_DATA_TIMEOUT);
337 			gspca_dbg(gspca_dev, D_PACK,
338 				  "Got %d bytes out of %d for header\n",
339 				  act_len, JL2005C_MAX_TRANSFER);
340 			if (ret < 0 || act_len < JL2005C_MAX_TRANSFER)
341 				goto quit_stream;
342 			/* Check whether we actually got the first blodk */
343 			if (memcmp(header_sig, buffer, 2) != 0) {
344 				pr_err("First block is not the first block\n");
345 				goto quit_stream;
346 			}
347 			/* total size to fetch is byte 7, times blocksize
348 			 * of which we already got act_len */
349 			bytes_left = buffer[0x07] * dev->block_size - act_len;
350 			gspca_dbg(gspca_dev, D_PACK, "bytes_left = 0x%x\n",
351 				  bytes_left);
352 			/* We keep the header. It has other information, too.*/
353 			packet_type = FIRST_PACKET;
354 			gspca_frame_add(gspca_dev, packet_type,
355 					buffer, act_len);
356 			header_read = 1;
357 		}
358 		while (bytes_left > 0 && gspca_dev->present) {
359 			data_len = bytes_left > JL2005C_MAX_TRANSFER ?
360 				JL2005C_MAX_TRANSFER : bytes_left;
361 			ret = usb_bulk_msg(gspca_dev->dev,
362 				usb_rcvbulkpipe(gspca_dev->dev, 0x82),
363 				buffer, data_len, &act_len,
364 				JL2005C_DATA_TIMEOUT);
365 			if (ret < 0 || act_len < data_len)
366 				goto quit_stream;
367 			gspca_dbg(gspca_dev, D_PACK,
368 				  "Got %d bytes out of %d for frame\n",
369 				  data_len, bytes_left);
370 			bytes_left -= data_len;
371 			if (bytes_left == 0) {
372 				packet_type = LAST_PACKET;
373 				header_read = 0;
374 			} else
375 				packet_type = INTER_PACKET;
376 			gspca_frame_add(gspca_dev, packet_type,
377 					buffer, data_len);
378 		}
379 	}
380 quit_stream:
381 	if (gspca_dev->present) {
382 		mutex_lock(&gspca_dev->usb_lock);
383 		jl2005c_stop(gspca_dev);
384 		mutex_unlock(&gspca_dev->usb_lock);
385 	}
386 	kfree(buffer);
387 }
388 
389 
390 
391 
392 /* This function is called at probe time */
393 static int sd_config(struct gspca_dev *gspca_dev,
394 			const struct usb_device_id *id)
395 {
396 	struct cam *cam;
397 	struct sd *sd = (struct sd *) gspca_dev;
398 
399 	cam = &gspca_dev->cam;
400 	/* We don't use the buffer gspca allocates so make it small. */
401 	cam->bulk_size = 64;
402 	cam->bulk = 1;
403 	/* For the rest, the camera needs to be detected */
404 	jl2005c_get_firmware_id(gspca_dev);
405 	/* Here are some known firmware IDs
406 	 * First some JL2005B cameras
407 	 * {0x41, 0x07, 0x04, 0x2c, 0xe8, 0xf2}	Sakar KidzCam
408 	 * {0x45, 0x02, 0x08, 0xb9, 0x00, 0xd2}	No-name JL2005B
409 	 * JL2005C cameras
410 	 * {0x01, 0x0c, 0x16, 0x10, 0xf8, 0xc8}	Argus DC-1512
411 	 * {0x12, 0x04, 0x03, 0xc0, 0x00, 0xd8}	ICarly
412 	 * {0x86, 0x08, 0x05, 0x02, 0x00, 0xd4}	Jazz
413 	 *
414 	 * Based upon this scanty evidence, we can detect a CIF camera by
415 	 * testing byte 0 for 0x4x.
416 	 */
417 	if ((sd->firmware_id[0] & 0xf0) == 0x40) {
418 		cam->cam_mode	= cif_mode;
419 		cam->nmodes	= ARRAY_SIZE(cif_mode);
420 		sd->block_size	= 0x80;
421 	} else {
422 		cam->cam_mode	= vga_mode;
423 		cam->nmodes	= ARRAY_SIZE(vga_mode);
424 		sd->block_size	= 0x200;
425 	}
426 
427 	INIT_WORK(&sd->work_struct, jl2005c_dostream);
428 
429 	return 0;
430 }
431 
432 /* this function is called at probe and resume time */
433 static int sd_init(struct gspca_dev *gspca_dev)
434 {
435 	return 0;
436 }
437 
438 static int sd_start(struct gspca_dev *gspca_dev)
439 {
440 
441 	struct sd *sd = (struct sd *) gspca_dev;
442 	sd->cap_mode = gspca_dev->cam.cam_mode;
443 
444 	switch (gspca_dev->pixfmt.width) {
445 	case 640:
446 		gspca_dbg(gspca_dev, D_STREAM, "Start streaming at vga resolution\n");
447 		jl2005c_stream_start_vga_lg(gspca_dev);
448 		break;
449 	case 320:
450 		gspca_dbg(gspca_dev, D_STREAM, "Start streaming at qvga resolution\n");
451 		jl2005c_stream_start_vga_small(gspca_dev);
452 		break;
453 	case 352:
454 		gspca_dbg(gspca_dev, D_STREAM, "Start streaming at cif resolution\n");
455 		jl2005c_stream_start_cif_lg(gspca_dev);
456 		break;
457 	case 176:
458 		gspca_dbg(gspca_dev, D_STREAM, "Start streaming at qcif resolution\n");
459 		jl2005c_stream_start_cif_small(gspca_dev);
460 		break;
461 	default:
462 		pr_err("Unknown resolution specified\n");
463 		return -1;
464 	}
465 
466 	schedule_work(&sd->work_struct);
467 
468 	return 0;
469 }
470 
471 /* called on streamoff with alt==0 and on disconnect */
472 /* the usb_lock is held at entry - restore on exit */
473 static void sd_stop0(struct gspca_dev *gspca_dev)
474 {
475 	struct sd *dev = (struct sd *) gspca_dev;
476 
477 	/* wait for the work queue to terminate */
478 	mutex_unlock(&gspca_dev->usb_lock);
479 	/* This waits for sq905c_dostream to finish */
480 	flush_work(&dev->work_struct);
481 	mutex_lock(&gspca_dev->usb_lock);
482 }
483 
484 
485 
486 /* sub-driver description */
487 static const struct sd_desc sd_desc = {
488 	.name = MODULE_NAME,
489 	.config = sd_config,
490 	.init = sd_init,
491 	.start = sd_start,
492 	.stop0 = sd_stop0,
493 };
494 
495 /* -- module initialisation -- */
496 static const struct usb_device_id device_table[] = {
497 	{USB_DEVICE(0x0979, 0x0227)},
498 	{}
499 };
500 MODULE_DEVICE_TABLE(usb, device_table);
501 
502 /* -- device connect -- */
503 static int sd_probe(struct usb_interface *intf,
504 				const struct usb_device_id *id)
505 {
506 	return gspca_dev_probe(intf, id, &sd_desc, sizeof(struct sd),
507 				THIS_MODULE);
508 }
509 
510 static struct usb_driver sd_driver = {
511 	.name = MODULE_NAME,
512 	.id_table = device_table,
513 	.probe = sd_probe,
514 	.disconnect = gspca_disconnect,
515 #ifdef CONFIG_PM
516 	.suspend = gspca_suspend,
517 	.resume = gspca_resume,
518 	.reset_resume = gspca_resume,
519 #endif
520 };
521 
522 module_usb_driver(sd_driver);
523