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776338e1 JS |
1 | /* dvb-usb-urb.c is part of the DVB USB library. |
2 | * | |
3 | * Copyright (C) 2004-5 Patrick Boettcher (patrick.boettcher@desy.de) | |
4 | * see dvb-usb-init.c for copyright information. | |
5 | * | |
6 | * This file contains functions for initializing and handling the | |
7 | * USB and URB stuff. | |
8 | */ | |
9 | #include "dvb-usb-common.h" | |
10 | ||
11 | int dvb_usb_generic_rw(struct dvb_usb_device *d, u8 *wbuf, u16 wlen, u8 *rbuf, | |
12 | u16 rlen, int delay_ms) | |
13 | { | |
14 | int actlen,ret = -ENOMEM; | |
15 | ||
16 | if (d->props.generic_bulk_ctrl_endpoint == 0) { | |
17 | err("endpoint for generic control not specified."); | |
18 | return -EINVAL; | |
19 | } | |
20 | ||
21 | if (wbuf == NULL || wlen == 0) | |
22 | return -EINVAL; | |
23 | ||
24 | if ((ret = down_interruptible(&d->usb_sem))) | |
25 | return ret; | |
26 | ||
27 | debug_dump(wbuf,wlen,deb_xfer); | |
28 | ||
29 | ret = usb_bulk_msg(d->udev,usb_sndbulkpipe(d->udev, | |
30 | d->props.generic_bulk_ctrl_endpoint), wbuf,wlen,&actlen, | |
31 | 2*HZ); | |
32 | ||
33 | if (ret) | |
34 | err("bulk message failed: %d (%d/%d)",ret,wlen,actlen); | |
35 | else | |
36 | ret = actlen != wlen ? -1 : 0; | |
37 | ||
38 | /* an answer is expected, and no error before */ | |
39 | if (!ret && rbuf && rlen) { | |
40 | if (delay_ms) | |
41 | msleep(delay_ms); | |
42 | ||
43 | ret = usb_bulk_msg(d->udev,usb_rcvbulkpipe(d->udev, | |
44 | d->props.generic_bulk_ctrl_endpoint),rbuf,rlen,&actlen, | |
45 | 2*HZ); | |
46 | ||
47 | if (ret) | |
48 | err("recv bulk message failed: %d",ret); | |
49 | else | |
50 | debug_dump(rbuf,actlen,deb_xfer); | |
51 | } | |
52 | ||
53 | up(&d->usb_sem); | |
54 | return ret; | |
55 | } | |
56 | EXPORT_SYMBOL(dvb_usb_generic_rw); | |
57 | ||
58 | int dvb_usb_generic_write(struct dvb_usb_device *d, u8 *buf, u16 len) | |
59 | { | |
60 | return dvb_usb_generic_rw(d,buf,len,NULL,0,0); | |
61 | } | |
62 | EXPORT_SYMBOL(dvb_usb_generic_write); | |
63 | ||
64 | static void dvb_usb_bulk_urb_complete(struct urb *urb, struct pt_regs *ptregs) | |
65 | { | |
66 | struct dvb_usb_device *d = urb->context; | |
67 | ||
68 | deb_ts("bulk urb completed. feedcount: %d, status: %d, length: %d\n",d->feedcount,urb->status, | |
69 | urb->actual_length); | |
70 | ||
71 | switch (urb->status) { | |
72 | case 0: /* success */ | |
73 | case -ETIMEDOUT: /* NAK */ | |
74 | break; | |
75 | case -ECONNRESET: /* kill */ | |
76 | case -ENOENT: | |
77 | case -ESHUTDOWN: | |
78 | return; | |
79 | default: /* error */ | |
80 | deb_ts("urb completition error %d.", urb->status); | |
81 | break; | |
82 | } | |
83 | ||
84 | if (d->feedcount > 0 && urb->actual_length > 0) { | |
85 | if (d->state & DVB_USB_STATE_DVB) | |
86 | dvb_dmx_swfilter(&d->demux, (u8*) urb->transfer_buffer,urb->actual_length); | |
87 | } else | |
88 | deb_ts("URB dropped because of feedcount.\n"); | |
89 | ||
90 | usb_submit_urb(urb,GFP_ATOMIC); | |
91 | } | |
92 | ||
93 | int dvb_usb_urb_kill(struct dvb_usb_device *d) | |
94 | { | |
95 | int i; | |
96 | for (i = 0; i < d->urbs_submitted; i++) { | |
97 | deb_info("killing URB no. %d.\n",i); | |
98 | ||
99 | /* stop the URB */ | |
100 | usb_kill_urb(d->urb_list[i]); | |
101 | } | |
102 | d->urbs_submitted = 0; | |
103 | return 0; | |
104 | } | |
105 | ||
106 | int dvb_usb_urb_submit(struct dvb_usb_device *d) | |
107 | { | |
108 | int i,ret; | |
109 | for (i = 0; i < d->urbs_initialized; i++) { | |
110 | deb_info("submitting URB no. %d\n",i); | |
111 | if ((ret = usb_submit_urb(d->urb_list[i],GFP_ATOMIC))) { | |
112 | err("could not submit URB no. %d - get them all back\n",i); | |
113 | dvb_usb_urb_kill(d); | |
114 | return ret; | |
115 | } | |
116 | d->urbs_submitted++; | |
117 | } | |
118 | return 0; | |
119 | } | |
120 | ||
121 | static int dvb_usb_bulk_urb_init(struct dvb_usb_device *d) | |
122 | { | |
123 | int i,bufsize = d->props.urb.count * d->props.urb.u.bulk.buffersize; | |
124 | ||
125 | deb_info("allocate %d bytes as buffersize for all URBs\n",bufsize); | |
126 | /* allocate the actual buffer for the URBs */ | |
127 | if ((d->buffer = usb_buffer_alloc(d->udev, bufsize, SLAB_ATOMIC, &d->dma_handle)) == NULL) { | |
128 | deb_info("not enough memory for urb-buffer allocation.\n"); | |
129 | return -ENOMEM; | |
130 | } | |
131 | deb_info("allocation successful\n"); | |
132 | memset(d->buffer,0,bufsize); | |
133 | ||
134 | d->state |= DVB_USB_STATE_URB_BUF; | |
135 | ||
136 | /* allocate the URBs */ | |
137 | for (i = 0; i < d->props.urb.count; i++) { | |
138 | if (!(d->urb_list[i] = usb_alloc_urb(0,GFP_ATOMIC))) { | |
139 | return -ENOMEM; | |
140 | } | |
141 | ||
142 | usb_fill_bulk_urb( d->urb_list[i], d->udev, | |
143 | usb_rcvbulkpipe(d->udev,d->props.urb.endpoint), | |
144 | &d->buffer[i*d->props.urb.u.bulk.buffersize], | |
145 | d->props.urb.u.bulk.buffersize, | |
146 | dvb_usb_bulk_urb_complete, d); | |
147 | ||
148 | d->urb_list[i]->transfer_flags = 0; | |
149 | d->urbs_initialized++; | |
150 | } | |
151 | return 0; | |
152 | } | |
153 | ||
154 | int dvb_usb_urb_init(struct dvb_usb_device *d) | |
155 | { | |
156 | /* | |
157 | * when reloading the driver w/o replugging the device | |
158 | * sometimes a timeout occures, this helps | |
159 | */ | |
160 | if (d->props.generic_bulk_ctrl_endpoint != 0) { | |
161 | usb_clear_halt(d->udev,usb_sndbulkpipe(d->udev,d->props.generic_bulk_ctrl_endpoint)); | |
162 | usb_clear_halt(d->udev,usb_rcvbulkpipe(d->udev,d->props.generic_bulk_ctrl_endpoint)); | |
163 | } | |
164 | usb_clear_halt(d->udev,usb_rcvbulkpipe(d->udev,d->props.urb.endpoint)); | |
165 | ||
166 | /* allocate the array for the data transfer URBs */ | |
167 | d->urb_list = kmalloc(d->props.urb.count * sizeof(struct urb *),GFP_KERNEL); | |
168 | if (d->urb_list == NULL) | |
169 | return -ENOMEM; | |
170 | memset(d->urb_list,0,d->props.urb.count * sizeof(struct urb *)); | |
171 | d->state |= DVB_USB_STATE_URB_LIST; | |
172 | ||
173 | switch (d->props.urb.type) { | |
174 | case DVB_USB_BULK: | |
175 | return dvb_usb_bulk_urb_init(d); | |
176 | case DVB_USB_ISOC: | |
177 | err("isochronous transfer not yet implemented in dvb-usb."); | |
178 | return -EINVAL; | |
179 | default: | |
180 | err("unkown URB-type for data transfer."); | |
181 | return -EINVAL; | |
182 | } | |
183 | } | |
184 | ||
185 | int dvb_usb_urb_exit(struct dvb_usb_device *d) | |
186 | { | |
187 | int i; | |
188 | ||
189 | dvb_usb_urb_kill(d); | |
190 | ||
191 | if (d->state & DVB_USB_STATE_URB_LIST) { | |
192 | for (i = 0; i < d->urbs_initialized; i++) { | |
193 | if (d->urb_list[i] != NULL) { | |
194 | deb_info("freeing URB no. %d.\n",i); | |
195 | /* free the URBs */ | |
196 | usb_free_urb(d->urb_list[i]); | |
197 | } | |
198 | } | |
199 | d->urbs_initialized = 0; | |
200 | /* free the urb array */ | |
201 | kfree(d->urb_list); | |
202 | d->state &= ~DVB_USB_STATE_URB_LIST; | |
203 | } | |
204 | ||
205 | if (d->state & DVB_USB_STATE_URB_BUF) | |
206 | usb_buffer_free(d->udev, d->props.urb.u.bulk.buffersize * d->props.urb.count, | |
207 | d->buffer, d->dma_handle); | |
208 | ||
209 | d->state &= ~DVB_USB_STATE_URB_BUF; | |
210 | return 0; | |
211 | } |