1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * SQ905 subdriver
4 *
5 * Copyright (C) 2008, 2009 Adam Baker and Theodore Kilgore
6 */
7
8/*
9 * History and Acknowledgments
10 *
11 * The original Linux driver for SQ905 based cameras was written by
12 * Marcell Lengyel and further developed by many other contributors
13 * and is available from http://sourceforge.net/projects/sqcam/
14 *
15 * This driver takes advantage of the reverse engineering work done for
16 * that driver and for libgphoto2 but shares no code with them.
17 *
18 * This driver has used as a base the finepix driver and other gspca
19 * based drivers and may still contain code fragments taken from those
20 * drivers.
21 */
22
23#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24
25#define MODULE_NAME "sq905"
26
27#include <linux/workqueue.h>
28#include <linux/slab.h>
29#include "gspca.h"
30
31MODULE_AUTHOR("Adam Baker <linux@baker-net.org.uk>, Theodore Kilgore <kilgota@auburn.edu>");
32MODULE_DESCRIPTION("GSPCA/SQ905 USB Camera Driver");
33MODULE_LICENSE("GPL");
34
35/* Default timeouts, in ms */
36#define SQ905_CMD_TIMEOUT 500
37#define SQ905_DATA_TIMEOUT 1000
38
39/* Maximum transfer size to use. */
40#define SQ905_MAX_TRANSFER 0x8000
41#define FRAME_HEADER_LEN 64
42
43/* The known modes, or registers. These go in the "value" slot. */
44
45/* 00 is "none" obviously */
46
47#define SQ905_BULK_READ 0x03 /* precedes any bulk read */
48#define SQ905_COMMAND 0x06 /* precedes the command codes below */
49#define SQ905_PING 0x07 /* when reading an "idling" command */
50#define SQ905_READ_DONE 0xc0 /* ack bulk read completed */
51
52/* Any non-zero value in the bottom 2 bits of the 2nd byte of
53 * the ID appears to indicate the camera can do 640*480. If the
54 * LSB of that byte is set the image is just upside down, otherwise
55 * it is rotated 180 degrees. */
56#define SQ905_HIRES_MASK 0x00000300
57#define SQ905_ORIENTATION_MASK 0x00000100
58
59/* Some command codes. These go in the "index" slot. */
60
61#define SQ905_ID 0xf0 /* asks for model string */
62#define SQ905_CONFIG 0x20 /* gets photo alloc. table, not used here */
63#define SQ905_DATA 0x30 /* accesses photo data, not used here */
64#define SQ905_CLEAR 0xa0 /* clear everything */
65#define SQ905_CAPTURE_LOW 0x60 /* Starts capture at 160x120 */
66#define SQ905_CAPTURE_MED 0x61 /* Starts capture at 320x240 */
67#define SQ905_CAPTURE_HIGH 0x62 /* Starts capture at 640x480 (some cams only) */
68/* note that the capture command also controls the output dimensions */
69
70/* Structure to hold all of our device specific stuff */
71struct sd {
72 struct gspca_dev gspca_dev; /* !! must be the first item */
73
74 /*
75 * Driver stuff
76 */
77 struct work_struct work_struct;
78 struct workqueue_struct *work_thread;
79};
80
81static struct v4l2_pix_format sq905_mode[] = {
82 { 160, 120, V4L2_PIX_FMT_SBGGR8, V4L2_FIELD_NONE,
83 .bytesperline = 160,
84 .sizeimage = 160 * 120,
85 .colorspace = V4L2_COLORSPACE_SRGB,
86 .priv = 0},
87 { 320, 240, V4L2_PIX_FMT_SBGGR8, V4L2_FIELD_NONE,
88 .bytesperline = 320,
89 .sizeimage = 320 * 240,
90 .colorspace = V4L2_COLORSPACE_SRGB,
91 .priv = 0},
92 { 640, 480, V4L2_PIX_FMT_SBGGR8, V4L2_FIELD_NONE,
93 .bytesperline = 640,
94 .sizeimage = 640 * 480,
95 .colorspace = V4L2_COLORSPACE_SRGB,
96 .priv = 0}
97};
98
99/*
100 * Send a command to the camera.
101 */
102static int sq905_command(struct gspca_dev *gspca_dev, u16 index)
103{
104 int ret;
105
106 gspca_dev->usb_buf[0] = '\0';
107 ret = usb_control_msg(dev: gspca_dev->dev,
108 usb_sndctrlpipe(gspca_dev->dev, 0),
109 USB_REQ_SYNCH_FRAME, /* request */
110 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
111 SQ905_COMMAND, index, data: gspca_dev->usb_buf, size: 1,
112 SQ905_CMD_TIMEOUT);
113 if (ret < 0) {
114 pr_err("%s: usb_control_msg failed (%d)\n", __func__, ret);
115 return ret;
116 }
117
118 ret = usb_control_msg(dev: gspca_dev->dev,
119 usb_rcvctrlpipe(gspca_dev->dev, 0),
120 USB_REQ_SYNCH_FRAME, /* request */
121 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
122 SQ905_PING, index: 0, data: gspca_dev->usb_buf, size: 1,
123 SQ905_CMD_TIMEOUT);
124 if (ret < 0) {
125 pr_err("%s: usb_control_msg failed 2 (%d)\n", __func__, ret);
126 return ret;
127 }
128
129 return 0;
130}
131
132/*
133 * Acknowledge the end of a frame - see warning on sq905_command.
134 */
135static int sq905_ack_frame(struct gspca_dev *gspca_dev)
136{
137 int ret;
138
139 gspca_dev->usb_buf[0] = '\0';
140 ret = usb_control_msg(dev: gspca_dev->dev,
141 usb_sndctrlpipe(gspca_dev->dev, 0),
142 USB_REQ_SYNCH_FRAME, /* request */
143 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
144 SQ905_READ_DONE, index: 0, data: gspca_dev->usb_buf, size: 1,
145 SQ905_CMD_TIMEOUT);
146 if (ret < 0) {
147 pr_err("%s: usb_control_msg failed (%d)\n", __func__, ret);
148 return ret;
149 }
150
151 return 0;
152}
153
154/*
155 * request and read a block of data - see warning on sq905_command.
156 */
157static int
158sq905_read_data(struct gspca_dev *gspca_dev, u8 *data, int size, int need_lock)
159{
160 int ret;
161 int act_len = 0;
162
163 gspca_dev->usb_buf[0] = '\0';
164 if (need_lock)
165 mutex_lock(&gspca_dev->usb_lock);
166 ret = usb_control_msg(dev: gspca_dev->dev,
167 usb_sndctrlpipe(gspca_dev->dev, 0),
168 USB_REQ_SYNCH_FRAME, /* request */
169 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
170 SQ905_BULK_READ, index: size, data: gspca_dev->usb_buf,
171 size: 1, SQ905_CMD_TIMEOUT);
172 if (need_lock)
173 mutex_unlock(lock: &gspca_dev->usb_lock);
174 if (ret < 0) {
175 pr_err("%s: usb_control_msg failed (%d)\n", __func__, ret);
176 return ret;
177 }
178 ret = usb_bulk_msg(usb_dev: gspca_dev->dev,
179 usb_rcvbulkpipe(gspca_dev->dev, 0x81),
180 data, len: size, actual_length: &act_len, SQ905_DATA_TIMEOUT);
181
182 /* successful, it returns 0, otherwise negative */
183 if (ret < 0 || act_len != size) {
184 pr_err("bulk read fail (%d) len %d/%d\n", ret, act_len, size);
185 return -EIO;
186 }
187 return 0;
188}
189
190/*
191 * This function is called as a workqueue function and runs whenever the camera
192 * is streaming data. Because it is a workqueue function it is allowed to sleep
193 * so we can use synchronous USB calls. To avoid possible collisions with other
194 * threads attempting to use gspca_dev->usb_buf we take the usb_lock when
195 * performing USB operations using it. In practice we don't really need this
196 * as the camera doesn't provide any controls.
197 */
198static void sq905_dostream(struct work_struct *work)
199{
200 struct sd *dev = container_of(work, struct sd, work_struct);
201 struct gspca_dev *gspca_dev = &dev->gspca_dev;
202 int bytes_left; /* bytes remaining in current frame. */
203 int data_len; /* size to use for the next read. */
204 int header_read; /* true if we have already read the frame header. */
205 int packet_type;
206 int frame_sz;
207 int ret;
208 u8 *data;
209 u8 *buffer;
210
211 buffer = kmalloc(SQ905_MAX_TRANSFER, GFP_KERNEL);
212 if (!buffer) {
213 pr_err("Couldn't allocate USB buffer\n");
214 goto quit_stream;
215 }
216
217 frame_sz = gspca_dev->cam.cam_mode[gspca_dev->curr_mode].sizeimage
218 + FRAME_HEADER_LEN;
219
220 while (gspca_dev->present && gspca_dev->streaming) {
221#ifdef CONFIG_PM
222 if (gspca_dev->frozen)
223 break;
224#endif
225 /* request some data and then read it until we have
226 * a complete frame. */
227 bytes_left = frame_sz;
228 header_read = 0;
229
230 /* Note we do not check for gspca_dev->streaming here, as
231 we must finish reading an entire frame, otherwise the
232 next time we stream we start reading in the middle of a
233 frame. */
234 while (bytes_left > 0 && gspca_dev->present) {
235 data_len = bytes_left > SQ905_MAX_TRANSFER ?
236 SQ905_MAX_TRANSFER : bytes_left;
237 ret = sq905_read_data(gspca_dev, data: buffer, size: data_len, need_lock: 1);
238 if (ret < 0)
239 goto quit_stream;
240 gspca_dbg(gspca_dev, D_PACK,
241 "Got %d bytes out of %d for frame\n",
242 data_len, bytes_left);
243 bytes_left -= data_len;
244 data = buffer;
245 if (!header_read) {
246 packet_type = FIRST_PACKET;
247 /* The first 64 bytes of each frame are
248 * a header full of FF 00 bytes */
249 data += FRAME_HEADER_LEN;
250 data_len -= FRAME_HEADER_LEN;
251 header_read = 1;
252 } else if (bytes_left == 0) {
253 packet_type = LAST_PACKET;
254 } else {
255 packet_type = INTER_PACKET;
256 }
257 gspca_frame_add(gspca_dev, packet_type,
258 data, len: data_len);
259 /* If entire frame fits in one packet we still
260 need to add a LAST_PACKET */
261 if (packet_type == FIRST_PACKET &&
262 bytes_left == 0)
263 gspca_frame_add(gspca_dev, packet_type: LAST_PACKET,
264 NULL, len: 0);
265 }
266 if (gspca_dev->present) {
267 /* acknowledge the frame */
268 mutex_lock(&gspca_dev->usb_lock);
269 ret = sq905_ack_frame(gspca_dev);
270 mutex_unlock(lock: &gspca_dev->usb_lock);
271 if (ret < 0)
272 goto quit_stream;
273 }
274 }
275quit_stream:
276 if (gspca_dev->present) {
277 mutex_lock(&gspca_dev->usb_lock);
278 sq905_command(gspca_dev, SQ905_CLEAR);
279 mutex_unlock(lock: &gspca_dev->usb_lock);
280 }
281 kfree(objp: buffer);
282}
283
284/* This function is called at probe time just before sd_init */
285static int sd_config(struct gspca_dev *gspca_dev,
286 const struct usb_device_id *id)
287{
288 struct cam *cam = &gspca_dev->cam;
289 struct sd *dev = (struct sd *) gspca_dev;
290
291 /* We don't use the buffer gspca allocates so make it small. */
292 cam->bulk = 1;
293 cam->bulk_size = 64;
294
295 INIT_WORK(&dev->work_struct, sq905_dostream);
296
297 return 0;
298}
299
300/* called on streamoff with alt==0 and on disconnect */
301/* the usb_lock is held at entry - restore on exit */
302static void sd_stop0(struct gspca_dev *gspca_dev)
303{
304 struct sd *dev = (struct sd *) gspca_dev;
305
306 /* wait for the work queue to terminate */
307 mutex_unlock(lock: &gspca_dev->usb_lock);
308 /* This waits for sq905_dostream to finish */
309 destroy_workqueue(wq: dev->work_thread);
310 dev->work_thread = NULL;
311 mutex_lock(&gspca_dev->usb_lock);
312}
313
314/* this function is called at probe and resume time */
315static int sd_init(struct gspca_dev *gspca_dev)
316{
317 u32 ident;
318 int ret;
319
320 /* connect to the camera and read
321 * the model ID and process that and put it away.
322 */
323 ret = sq905_command(gspca_dev, SQ905_CLEAR);
324 if (ret < 0)
325 return ret;
326 ret = sq905_command(gspca_dev, SQ905_ID);
327 if (ret < 0)
328 return ret;
329 ret = sq905_read_data(gspca_dev, data: gspca_dev->usb_buf, size: 4, need_lock: 0);
330 if (ret < 0)
331 return ret;
332 /* usb_buf is allocated with kmalloc so is aligned.
333 * Camera model number is the right way round if we assume this
334 * reverse engineered ID is supposed to be big endian. */
335 ident = be32_to_cpup(p: (__be32 *)gspca_dev->usb_buf);
336 ret = sq905_command(gspca_dev, SQ905_CLEAR);
337 if (ret < 0)
338 return ret;
339 gspca_dbg(gspca_dev, D_CONF, "SQ905 camera ID %08x detected\n", ident);
340 gspca_dev->cam.cam_mode = sq905_mode;
341 gspca_dev->cam.nmodes = ARRAY_SIZE(sq905_mode);
342 if (!(ident & SQ905_HIRES_MASK))
343 gspca_dev->cam.nmodes--;
344
345 if (ident & SQ905_ORIENTATION_MASK)
346 gspca_dev->cam.input_flags = V4L2_IN_ST_VFLIP;
347 else
348 gspca_dev->cam.input_flags = V4L2_IN_ST_VFLIP |
349 V4L2_IN_ST_HFLIP;
350 return 0;
351}
352
353/* Set up for getting frames. */
354static int sd_start(struct gspca_dev *gspca_dev)
355{
356 struct sd *dev = (struct sd *) gspca_dev;
357 int ret;
358
359 /* "Open the shutter" and set size, to start capture */
360 switch (gspca_dev->curr_mode) {
361 default:
362/* case 2: */
363 gspca_dbg(gspca_dev, D_STREAM, "Start streaming at high resolution\n");
364 ret = sq905_command(gspca_dev: &dev->gspca_dev, SQ905_CAPTURE_HIGH);
365 break;
366 case 1:
367 gspca_dbg(gspca_dev, D_STREAM, "Start streaming at medium resolution\n");
368 ret = sq905_command(gspca_dev: &dev->gspca_dev, SQ905_CAPTURE_MED);
369 break;
370 case 0:
371 gspca_dbg(gspca_dev, D_STREAM, "Start streaming at low resolution\n");
372 ret = sq905_command(gspca_dev: &dev->gspca_dev, SQ905_CAPTURE_LOW);
373 }
374
375 if (ret < 0) {
376 gspca_err(gspca_dev, "Start streaming command failed\n");
377 return ret;
378 }
379 /* Start the workqueue function to do the streaming */
380 dev->work_thread = create_singlethread_workqueue(MODULE_NAME);
381 if (!dev->work_thread)
382 return -ENOMEM;
383
384 queue_work(wq: dev->work_thread, work: &dev->work_struct);
385
386 return 0;
387}
388
389/* Table of supported USB devices */
390static const struct usb_device_id device_table[] = {
391 {USB_DEVICE(0x2770, 0x9120)},
392 {}
393};
394
395MODULE_DEVICE_TABLE(usb, device_table);
396
397/* sub-driver description */
398static const struct sd_desc sd_desc = {
399 .name = MODULE_NAME,
400 .config = sd_config,
401 .init = sd_init,
402 .start = sd_start,
403 .stop0 = sd_stop0,
404};
405
406/* -- device connect -- */
407static int sd_probe(struct usb_interface *intf,
408 const struct usb_device_id *id)
409{
410 return gspca_dev_probe(intf, id,
411 sd_desc: &sd_desc,
412 dev_size: sizeof(struct sd),
413 THIS_MODULE);
414}
415
416static struct usb_driver sd_driver = {
417 .name = MODULE_NAME,
418 .id_table = device_table,
419 .probe = sd_probe,
420 .disconnect = gspca_disconnect,
421#ifdef CONFIG_PM
422 .suspend = gspca_suspend,
423 .resume = gspca_resume,
424 .reset_resume = gspca_resume,
425#endif
426};
427
428module_usb_driver(sd_driver);
429

source code of linux/drivers/media/usb/gspca/sq905.c