1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * gspca ViCam subdriver
4 *
5 * Copyright (C) 2011 Hans de Goede <hdegoede@redhat.com>
6 *
7 * Based on the usbvideo vicam driver, which is:
8 *
9 * Copyright (c) 2002 Joe Burks (jburks@wavicle.org),
10 * Chris Cheney (chris.cheney@gmail.com),
11 * Pavel Machek (pavel@ucw.cz),
12 * John Tyner (jtyner@cs.ucr.edu),
13 * Monroe Williams (monroe@pobox.com)
14 */
15
16 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
17
18 #define MODULE_NAME "vicam"
19 #define HEADER_SIZE 64
20
21 #include <linux/workqueue.h>
22 #include <linux/slab.h>
23 #include <linux/firmware.h>
24 #include <linux/ihex.h>
25 #include "gspca.h"
26
27 #define VICAM_FIRMWARE "vicam/firmware.fw"
28
29 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
30 MODULE_DESCRIPTION("GSPCA ViCam USB Camera Driver");
31 MODULE_LICENSE("GPL");
32 MODULE_FIRMWARE(VICAM_FIRMWARE);
33
34 struct sd {
35 struct gspca_dev gspca_dev; /* !! must be the first item */
36 struct work_struct work_struct;
37 };
38
39 /* The vicam sensor has a resolution of 512 x 244, with I believe square
40 pixels, but this is forced to a 4:3 ratio by optics. So it has
41 non square pixels :( */
42 static struct v4l2_pix_format vicam_mode[] = {
43 { 256, 122, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
44 .bytesperline = 256,
45 .sizeimage = 256 * 122,
46 .colorspace = V4L2_COLORSPACE_SRGB,},
47 /* 2 modes with somewhat more square pixels */
48 { 256, 200, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
49 .bytesperline = 256,
50 .sizeimage = 256 * 200,
51 .colorspace = V4L2_COLORSPACE_SRGB,},
52 { 256, 240, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
53 .bytesperline = 256,
54 .sizeimage = 256 * 240,
55 .colorspace = V4L2_COLORSPACE_SRGB,},
56 #if 0 /* This mode has extremely non square pixels, testing use only */
57 { 512, 122, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
58 .bytesperline = 512,
59 .sizeimage = 512 * 122,
60 .colorspace = V4L2_COLORSPACE_SRGB,},
61 #endif
62 { 512, 244, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
63 .bytesperline = 512,
64 .sizeimage = 512 * 244,
65 .colorspace = V4L2_COLORSPACE_SRGB,},
66 };
67
vicam_control_msg(struct gspca_dev * gspca_dev,u8 request,u16 value,u16 index,u8 * data,u16 len)68 static int vicam_control_msg(struct gspca_dev *gspca_dev, u8 request,
69 u16 value, u16 index, u8 *data, u16 len)
70 {
71 int ret;
72
73 ret = usb_control_msg(gspca_dev->dev,
74 usb_sndctrlpipe(gspca_dev->dev, 0),
75 request,
76 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
77 value, index, data, len, 1000);
78 if (ret < 0)
79 pr_err("control msg req %02X error %d\n", request, ret);
80
81 return ret;
82 }
83
vicam_set_camera_power(struct gspca_dev * gspca_dev,int state)84 static int vicam_set_camera_power(struct gspca_dev *gspca_dev, int state)
85 {
86 int ret;
87
88 ret = vicam_control_msg(gspca_dev, 0x50, state, 0, NULL, 0);
89 if (ret < 0)
90 return ret;
91
92 if (state)
93 ret = vicam_control_msg(gspca_dev, 0x55, 1, 0, NULL, 0);
94
95 return ret;
96 }
97
98 /*
99 * request and read a block of data
100 */
vicam_read_frame(struct gspca_dev * gspca_dev,u8 * data,int size)101 static int vicam_read_frame(struct gspca_dev *gspca_dev, u8 *data, int size)
102 {
103 int ret, unscaled_height, act_len = 0;
104 u8 *req_data = gspca_dev->usb_buf;
105 s32 expo = v4l2_ctrl_g_ctrl(gspca_dev->exposure);
106 s32 gain = v4l2_ctrl_g_ctrl(gspca_dev->gain);
107
108 memset(req_data, 0, 16);
109 req_data[0] = gain;
110 if (gspca_dev->pixfmt.width == 256)
111 req_data[1] |= 0x01; /* low nibble x-scale */
112 if (gspca_dev->pixfmt.height <= 122) {
113 req_data[1] |= 0x10; /* high nibble y-scale */
114 unscaled_height = gspca_dev->pixfmt.height * 2;
115 } else
116 unscaled_height = gspca_dev->pixfmt.height;
117 req_data[2] = 0x90; /* unknown, does not seem to do anything */
118 if (unscaled_height <= 200)
119 req_data[3] = 0x06; /* vend? */
120 else if (unscaled_height <= 242) /* Yes 242 not 240 */
121 req_data[3] = 0x07; /* vend? */
122 else /* Up to 244 lines with req_data[3] == 0x08 */
123 req_data[3] = 0x08; /* vend? */
124
125 if (expo < 256) {
126 /* Frame rate maxed out, use partial frame expo time */
127 req_data[4] = 255 - expo;
128 req_data[5] = 0x00;
129 req_data[6] = 0x00;
130 req_data[7] = 0x01;
131 } else {
132 /* Modify frame rate */
133 req_data[4] = 0x00;
134 req_data[5] = 0x00;
135 req_data[6] = expo & 0xFF;
136 req_data[7] = expo >> 8;
137 }
138 req_data[8] = ((244 - unscaled_height) / 2) & ~0x01; /* vstart */
139 /* bytes 9-15 do not seem to affect exposure or image quality */
140
141 mutex_lock(&gspca_dev->usb_lock);
142 ret = vicam_control_msg(gspca_dev, 0x51, 0x80, 0, req_data, 16);
143 mutex_unlock(&gspca_dev->usb_lock);
144 if (ret < 0)
145 return ret;
146
147 ret = usb_bulk_msg(gspca_dev->dev,
148 usb_rcvbulkpipe(gspca_dev->dev, 0x81),
149 data, size, &act_len, 10000);
150 /* successful, it returns 0, otherwise negative */
151 if (ret < 0 || act_len != size) {
152 pr_err("bulk read fail (%d) len %d/%d\n",
153 ret, act_len, size);
154 return -EIO;
155 }
156 return 0;
157 }
158
159 /*
160 * This function is called as a workqueue function and runs whenever the camera
161 * is streaming data. Because it is a workqueue function it is allowed to sleep
162 * so we can use synchronous USB calls. To avoid possible collisions with other
163 * threads attempting to use gspca_dev->usb_buf we take the usb_lock when
164 * performing USB operations using it. In practice we don't really need this
165 * as the cameras controls are only written from the workqueue.
166 */
vicam_dostream(struct work_struct * work)167 static void vicam_dostream(struct work_struct *work)
168 {
169 struct sd *sd = container_of(work, struct sd, work_struct);
170 struct gspca_dev *gspca_dev = &sd->gspca_dev;
171 int ret, frame_sz;
172 u8 *buffer;
173
174 frame_sz = gspca_dev->cam.cam_mode[gspca_dev->curr_mode].sizeimage +
175 HEADER_SIZE;
176 buffer = kmalloc(frame_sz, GFP_KERNEL);
177 if (!buffer) {
178 pr_err("Couldn't allocate USB buffer\n");
179 goto exit;
180 }
181
182 while (gspca_dev->present && gspca_dev->streaming) {
183 #ifdef CONFIG_PM
184 if (gspca_dev->frozen)
185 break;
186 #endif
187 ret = vicam_read_frame(gspca_dev, buffer, frame_sz);
188 if (ret < 0)
189 break;
190
191 /* Note the frame header contents seem to be completely
192 constant, they do not change with either image, or
193 settings. So we simply discard it. The frames have
194 a very similar 64 byte footer, which we don't even
195 bother reading from the cam */
196 gspca_frame_add(gspca_dev, FIRST_PACKET,
197 buffer + HEADER_SIZE,
198 frame_sz - HEADER_SIZE);
199 gspca_frame_add(gspca_dev, LAST_PACKET, NULL, 0);
200 }
201 exit:
202 kfree(buffer);
203 }
204
205 /* This function is called at probe time just before sd_init */
sd_config(struct gspca_dev * gspca_dev,const struct usb_device_id * id)206 static int sd_config(struct gspca_dev *gspca_dev,
207 const struct usb_device_id *id)
208 {
209 struct cam *cam = &gspca_dev->cam;
210 struct sd *sd = (struct sd *)gspca_dev;
211
212 /* We don't use the buffer gspca allocates so make it small. */
213 cam->bulk = 1;
214 cam->bulk_size = 64;
215 cam->cam_mode = vicam_mode;
216 cam->nmodes = ARRAY_SIZE(vicam_mode);
217
218 INIT_WORK(&sd->work_struct, vicam_dostream);
219
220 return 0;
221 }
222
223 /* this function is called at probe and resume time */
sd_init(struct gspca_dev * gspca_dev)224 static int sd_init(struct gspca_dev *gspca_dev)
225 {
226 int ret;
227 const struct ihex_binrec *rec;
228 const struct firmware *fw;
229 u8 *firmware_buf;
230
231 ret = request_ihex_firmware(&fw, VICAM_FIRMWARE,
232 &gspca_dev->dev->dev);
233 if (ret) {
234 pr_err("Failed to load \"vicam/firmware.fw\": %d\n", ret);
235 return ret;
236 }
237
238 firmware_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
239 if (!firmware_buf) {
240 ret = -ENOMEM;
241 goto exit;
242 }
243 for (rec = (void *)fw->data; rec; rec = ihex_next_binrec(rec)) {
244 memcpy(firmware_buf, rec->data, be16_to_cpu(rec->len));
245 ret = vicam_control_msg(gspca_dev, 0xff, 0, 0, firmware_buf,
246 be16_to_cpu(rec->len));
247 if (ret < 0)
248 break;
249 }
250
251 kfree(firmware_buf);
252 exit:
253 release_firmware(fw);
254 return ret;
255 }
256
257 /* Set up for getting frames. */
sd_start(struct gspca_dev * gspca_dev)258 static int sd_start(struct gspca_dev *gspca_dev)
259 {
260 struct sd *sd = (struct sd *)gspca_dev;
261 int ret;
262
263 ret = vicam_set_camera_power(gspca_dev, 1);
264 if (ret < 0)
265 return ret;
266
267 schedule_work(&sd->work_struct);
268
269 return 0;
270 }
271
272 /* called on streamoff with alt==0 and on disconnect */
273 /* the usb_lock is held at entry - restore on exit */
sd_stop0(struct gspca_dev * gspca_dev)274 static void sd_stop0(struct gspca_dev *gspca_dev)
275 {
276 struct sd *dev = (struct sd *)gspca_dev;
277
278 /* wait for the work queue to terminate */
279 mutex_unlock(&gspca_dev->usb_lock);
280 /* This waits for vicam_dostream to finish */
281 flush_work(&dev->work_struct);
282 mutex_lock(&gspca_dev->usb_lock);
283
284 if (gspca_dev->present)
285 vicam_set_camera_power(gspca_dev, 0);
286 }
287
sd_init_controls(struct gspca_dev * gspca_dev)288 static int sd_init_controls(struct gspca_dev *gspca_dev)
289 {
290 struct v4l2_ctrl_handler *hdl = &gspca_dev->ctrl_handler;
291
292 gspca_dev->vdev.ctrl_handler = hdl;
293 v4l2_ctrl_handler_init(hdl, 2);
294 gspca_dev->exposure = v4l2_ctrl_new_std(hdl, NULL,
295 V4L2_CID_EXPOSURE, 0, 2047, 1, 256);
296 gspca_dev->gain = v4l2_ctrl_new_std(hdl, NULL,
297 V4L2_CID_GAIN, 0, 255, 1, 200);
298
299 if (hdl->error) {
300 pr_err("Could not initialize controls\n");
301 return hdl->error;
302 }
303 return 0;
304 }
305
306 /* Table of supported USB devices */
307 static const struct usb_device_id device_table[] = {
308 {USB_DEVICE(0x04c1, 0x009d)},
309 {USB_DEVICE(0x0602, 0x1001)},
310 {}
311 };
312
313 MODULE_DEVICE_TABLE(usb, device_table);
314
315 /* sub-driver description */
316 static const struct sd_desc sd_desc = {
317 .name = MODULE_NAME,
318 .config = sd_config,
319 .init = sd_init,
320 .init_controls = sd_init_controls,
321 .start = sd_start,
322 .stop0 = sd_stop0,
323 };
324
325 /* -- device connect -- */
sd_probe(struct usb_interface * intf,const struct usb_device_id * id)326 static int sd_probe(struct usb_interface *intf,
327 const struct usb_device_id *id)
328 {
329 return gspca_dev_probe(intf, id,
330 &sd_desc,
331 sizeof(struct sd),
332 THIS_MODULE);
333 }
334
335 static struct usb_driver sd_driver = {
336 .name = MODULE_NAME,
337 .id_table = device_table,
338 .probe = sd_probe,
339 .disconnect = gspca_disconnect,
340 #ifdef CONFIG_PM
341 .suspend = gspca_suspend,
342 .resume = gspca_resume,
343 .reset_resume = gspca_resume,
344 #endif
345 };
346
347 module_usb_driver(sd_driver);
348