Merge remote-tracking branch 'ftrace/for-next'
[deliverable/linux.git] / drivers / media / usb / gspca / benq.c
CommitLineData
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1/*
2 * Benq DC E300 subdriver
3 *
4 * Copyright (C) 2009 Jean-Francois Moine (http://moinejf.free.fr)
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
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21#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
22
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23#define MODULE_NAME "benq"
24
25#include "gspca.h"
26
27MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
28MODULE_DESCRIPTION("Benq DC E300 USB Camera Driver");
29MODULE_LICENSE("GPL");
30
31/* specific webcam descriptor */
32struct sd {
33 struct gspca_dev gspca_dev; /* !! must be the first item */
34};
35
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36static const struct v4l2_pix_format vga_mode[] = {
37 {320, 240, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
38 .bytesperline = 320,
39 .sizeimage = 320 * 240 * 3 / 8 + 590,
40 .colorspace = V4L2_COLORSPACE_JPEG},
41};
42
43static void sd_isoc_irq(struct urb *urb);
44
45/* -- write a register -- */
46static void reg_w(struct gspca_dev *gspca_dev,
47 u16 value, u16 index)
48{
49 struct usb_device *dev = gspca_dev->dev;
50 int ret;
51
52 if (gspca_dev->usb_err < 0)
53 return;
54 ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
55 0x02,
56 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
57 value,
58 index,
59 NULL,
60 0,
61 500);
62 if (ret < 0) {
133a9fe9 63 pr_err("reg_w err %d\n", ret);
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64 gspca_dev->usb_err = ret;
65 }
66}
67
68/* this function is called at probe time */
69static int sd_config(struct gspca_dev *gspca_dev,
70 const struct usb_device_id *id)
71{
72 gspca_dev->cam.cam_mode = vga_mode;
73 gspca_dev->cam.nmodes = ARRAY_SIZE(vga_mode);
74 gspca_dev->cam.no_urb_create = 1;
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75 return 0;
76}
77
78/* this function is called at probe and resume time */
79static int sd_init(struct gspca_dev *gspca_dev)
80{
81 return 0;
82}
83
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84/* -- start the camera -- */
85static int sd_start(struct gspca_dev *gspca_dev)
86{
87 struct urb *urb;
88 int i, n;
89
90 /* create 4 URBs - 2 on endpoint 0x83 and 2 on 0x082 */
91#if MAX_NURBS < 4
92#error "Not enough URBs in the gspca table"
93#endif
94#define SD_PKT_SZ 64
95#define SD_NPKT 32
96 for (n = 0; n < 4; n++) {
97 urb = usb_alloc_urb(SD_NPKT, GFP_KERNEL);
60e36999 98 if (!urb)
0a71d9ce 99 return -ENOMEM;
0a71d9ce 100 gspca_dev->urb[n] = urb;
997ea58e 101 urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
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102 SD_PKT_SZ * SD_NPKT,
103 GFP_KERNEL,
104 &urb->transfer_dma);
105
106 if (urb->transfer_buffer == NULL) {
133a9fe9 107 pr_err("usb_alloc_coherent failed\n");
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108 return -ENOMEM;
109 }
110 urb->dev = gspca_dev->dev;
111 urb->context = gspca_dev;
112 urb->transfer_buffer_length = SD_PKT_SZ * SD_NPKT;
113 urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
114 n & 1 ? 0x82 : 0x83);
115 urb->transfer_flags = URB_ISO_ASAP
116 | URB_NO_TRANSFER_DMA_MAP;
117 urb->interval = 1;
118 urb->complete = sd_isoc_irq;
119 urb->number_of_packets = SD_NPKT;
120 for (i = 0; i < SD_NPKT; i++) {
121 urb->iso_frame_desc[i].length = SD_PKT_SZ;
122 urb->iso_frame_desc[i].offset = SD_PKT_SZ * i;
123 }
124 }
125
126 return gspca_dev->usb_err;
127}
128
129static void sd_stopN(struct gspca_dev *gspca_dev)
130{
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131 struct usb_interface *intf;
132
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133 reg_w(gspca_dev, 0x003c, 0x0003);
134 reg_w(gspca_dev, 0x003c, 0x0004);
135 reg_w(gspca_dev, 0x003c, 0x0005);
136 reg_w(gspca_dev, 0x003c, 0x0006);
137 reg_w(gspca_dev, 0x003c, 0x0007);
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138
139 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
780e3121 140 usb_set_interface(gspca_dev->dev, gspca_dev->iface,
6121ca57 141 intf->num_altsetting - 1);
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142}
143
144static void sd_pkt_scan(struct gspca_dev *gspca_dev,
145 u8 *data, /* isoc packet */
146 int len) /* iso packet length */
147{
148 /* unused */
149}
150
151/* reception of an URB */
152static void sd_isoc_irq(struct urb *urb)
153{
154 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
155 struct urb *urb0;
156 u8 *data;
157 int i, st;
158
159 PDEBUG(D_PACK, "sd isoc irq");
160 if (!gspca_dev->streaming)
161 return;
162 if (urb->status != 0) {
163 if (urb->status == -ESHUTDOWN)
164 return; /* disconnection */
165#ifdef CONFIG_PM
166 if (gspca_dev->frozen)
167 return;
168#endif
133a9fe9 169 pr_err("urb status: %d\n", urb->status);
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170 return;
171 }
172
173 /* if this is a control URN (ep 0x83), wait */
174 if (urb == gspca_dev->urb[0] || urb == gspca_dev->urb[2])
175 return;
176
177 /* scan both received URBs */
178 if (urb == gspca_dev->urb[1])
179 urb0 = gspca_dev->urb[0];
180 else
181 urb0 = gspca_dev->urb[2];
182 for (i = 0; i < urb->number_of_packets; i++) {
183
184 /* check the packet status and length */
185 if (urb0->iso_frame_desc[i].actual_length != SD_PKT_SZ
186 || urb->iso_frame_desc[i].actual_length != SD_PKT_SZ) {
c93396e1 187 PERR("ISOC bad lengths %d / %d",
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188 urb0->iso_frame_desc[i].actual_length,
189 urb->iso_frame_desc[i].actual_length);
190 gspca_dev->last_packet_type = DISCARD_PACKET;
191 continue;
192 }
193 st = urb0->iso_frame_desc[i].status;
194 if (st == 0)
195 st = urb->iso_frame_desc[i].status;
196 if (st) {
133a9fe9 197 pr_err("ISOC data error: [%d] status=%d\n",
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198 i, st);
199 gspca_dev->last_packet_type = DISCARD_PACKET;
200 continue;
201 }
202
203 /*
204 * The images are received in URBs of different endpoints
205 * (0x83 and 0x82).
206 * Image pieces in URBs of ep 0x83 are continuated in URBs of
207 * ep 0x82 of the same index.
208 * The packets in the URBs of endpoint 0x83 start with:
209 * - 80 ba/bb 00 00 = start of image followed by 'ff d8'
210 * - 04 ba/bb oo oo = image piece
211 * where 'oo oo' is the image offset
212 (not cheked)
213 * - (other -> bad frame)
214 * The images are JPEG encoded with full header and
215 * normal ff escape.
216 * The end of image ('ff d9') may occur in any URB.
217 * (not cheked)
218 */
219 data = (u8 *) urb0->transfer_buffer
220 + urb0->iso_frame_desc[i].offset;
221 if (data[0] == 0x80 && (data[1] & 0xfe) == 0xba) {
222
223 /* new image */
224 gspca_frame_add(gspca_dev, LAST_PACKET,
225 NULL, 0);
226 gspca_frame_add(gspca_dev, FIRST_PACKET,
227 data + 4, SD_PKT_SZ - 4);
228 } else if (data[0] == 0x04 && (data[1] & 0xfe) == 0xba) {
229 gspca_frame_add(gspca_dev, INTER_PACKET,
230 data + 4, SD_PKT_SZ - 4);
231 } else {
232 gspca_dev->last_packet_type = DISCARD_PACKET;
233 continue;
234 }
235 data = (u8 *) urb->transfer_buffer
236 + urb->iso_frame_desc[i].offset;
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237 gspca_frame_add(gspca_dev, INTER_PACKET,
238 data, SD_PKT_SZ);
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239 }
240
241 /* resubmit the URBs */
242 st = usb_submit_urb(urb0, GFP_ATOMIC);
243 if (st < 0)
133a9fe9 244 pr_err("usb_submit_urb(0) ret %d\n", st);
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245 st = usb_submit_urb(urb, GFP_ATOMIC);
246 if (st < 0)
133a9fe9 247 pr_err("usb_submit_urb() ret %d\n", st);
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248}
249
250/* sub-driver description */
251static const struct sd_desc sd_desc = {
252 .name = MODULE_NAME,
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253 .config = sd_config,
254 .init = sd_init,
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255 .start = sd_start,
256 .stopN = sd_stopN,
257 .pkt_scan = sd_pkt_scan,
258};
259
260/* -- module initialisation -- */
95c967c1 261static const struct usb_device_id device_table[] = {
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262 {USB_DEVICE(0x04a5, 0x3035)},
263 {}
264};
265MODULE_DEVICE_TABLE(usb, device_table);
266
267/* -- device connect -- */
268static int sd_probe(struct usb_interface *intf,
269 const struct usb_device_id *id)
270{
271 return gspca_dev_probe(intf, id, &sd_desc, sizeof(struct sd),
272 THIS_MODULE);
273}
274
275static struct usb_driver sd_driver = {
276 .name = MODULE_NAME,
277 .id_table = device_table,
278 .probe = sd_probe,
279 .disconnect = gspca_disconnect,
280#ifdef CONFIG_PM
281 .suspend = gspca_suspend,
282 .resume = gspca_resume,
8bb58964 283 .reset_resume = gspca_resume,
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284#endif
285};
286
ecb3b2b3 287module_usb_driver(sd_driver);
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