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526 lines
12 KiB
526 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* STK1160 driver |
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* |
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* Copyright (C) 2012 Ezequiel Garcia |
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* <elezegarcia--a.t--gmail.com> |
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* |
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* Based on Easycap driver by R.M. Thomas |
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* Copyright (C) 2010 R.M. Thomas |
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* <rmthomas--a.t--sciolus.org> |
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*/ |
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#include <linux/module.h> |
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#include <linux/usb.h> |
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#include <linux/slab.h> |
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#include <linux/ratelimit.h> |
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#include "stk1160.h" |
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static unsigned int debug; |
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module_param(debug, int, 0644); |
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MODULE_PARM_DESC(debug, "enable debug messages"); |
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static inline void print_err_status(struct stk1160 *dev, |
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int packet, int status) |
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{ |
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char *errmsg = "Unknown"; |
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switch (status) { |
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case -ENOENT: |
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errmsg = "unlinked synchronously"; |
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break; |
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case -ECONNRESET: |
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errmsg = "unlinked asynchronously"; |
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break; |
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case -ENOSR: |
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errmsg = "Buffer error (overrun)"; |
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break; |
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case -EPIPE: |
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errmsg = "Stalled (device not responding)"; |
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break; |
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case -EOVERFLOW: |
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errmsg = "Babble (bad cable?)"; |
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break; |
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case -EPROTO: |
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errmsg = "Bit-stuff error (bad cable?)"; |
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break; |
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case -EILSEQ: |
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errmsg = "CRC/Timeout (could be anything)"; |
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break; |
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case -ETIME: |
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errmsg = "Device does not respond"; |
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break; |
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} |
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if (packet < 0) |
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printk_ratelimited(KERN_WARNING "URB status %d [%s].\n", |
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status, errmsg); |
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else |
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printk_ratelimited(KERN_INFO "URB packet %d, status %d [%s].\n", |
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packet, status, errmsg); |
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} |
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static inline |
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struct stk1160_buffer *stk1160_next_buffer(struct stk1160 *dev) |
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{ |
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struct stk1160_buffer *buf = NULL; |
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unsigned long flags = 0; |
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/* Current buffer must be NULL when this functions gets called */ |
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WARN_ON(dev->isoc_ctl.buf); |
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spin_lock_irqsave(&dev->buf_lock, flags); |
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if (!list_empty(&dev->avail_bufs)) { |
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buf = list_first_entry(&dev->avail_bufs, |
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struct stk1160_buffer, list); |
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list_del(&buf->list); |
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} |
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spin_unlock_irqrestore(&dev->buf_lock, flags); |
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return buf; |
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} |
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static inline |
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void stk1160_buffer_done(struct stk1160 *dev) |
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{ |
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struct stk1160_buffer *buf = dev->isoc_ctl.buf; |
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buf->vb.sequence = dev->sequence++; |
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buf->vb.field = V4L2_FIELD_INTERLACED; |
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buf->vb.vb2_buf.timestamp = ktime_get_ns(); |
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vb2_set_plane_payload(&buf->vb.vb2_buf, 0, buf->bytesused); |
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vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_DONE); |
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dev->isoc_ctl.buf = NULL; |
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} |
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static inline |
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void stk1160_copy_video(struct stk1160 *dev, u8 *src, int len) |
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{ |
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int linesdone, lineoff, lencopy; |
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int bytesperline = dev->width * 2; |
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struct stk1160_buffer *buf = dev->isoc_ctl.buf; |
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u8 *dst = buf->mem; |
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int remain; |
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/* |
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* TODO: These stk1160_dbg are very spammy! |
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* We should 1) check why we are getting them |
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* and 2) add ratelimit. |
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* |
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* UPDATE: One of the reasons (the only one?) for getting these |
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* is incorrect standard (mismatch between expected and configured). |
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* So perhaps, we could add a counter for errors. When the counter |
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* reaches some value, we simply stop streaming. |
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*/ |
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len -= 4; |
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src += 4; |
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remain = len; |
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linesdone = buf->pos / bytesperline; |
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lineoff = buf->pos % bytesperline; /* offset in current line */ |
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if (!buf->odd) |
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dst += bytesperline; |
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/* Multiply linesdone by two, to take account of the other field */ |
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dst += linesdone * bytesperline * 2 + lineoff; |
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/* Copy the remaining of current line */ |
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if (remain < (bytesperline - lineoff)) |
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lencopy = remain; |
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else |
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lencopy = bytesperline - lineoff; |
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/* |
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* Check if we have enough space left in the buffer. |
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* In that case, we force loop exit after copy. |
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*/ |
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if (lencopy > buf->bytesused - buf->length) { |
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lencopy = buf->bytesused - buf->length; |
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remain = lencopy; |
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} |
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/* Check if the copy is done */ |
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if (lencopy == 0 || remain == 0) |
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return; |
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/* Let the bug hunt begin! sanity checks! */ |
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if (lencopy < 0) { |
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stk1160_dbg("copy skipped: negative lencopy\n"); |
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return; |
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} |
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if ((unsigned long)dst + lencopy > |
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(unsigned long)buf->mem + buf->length) { |
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printk_ratelimited(KERN_WARNING "stk1160: buffer overflow detected\n"); |
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return; |
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} |
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memcpy(dst, src, lencopy); |
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buf->bytesused += lencopy; |
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buf->pos += lencopy; |
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remain -= lencopy; |
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/* Copy current field line by line, interlacing with the other field */ |
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while (remain > 0) { |
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dst += lencopy + bytesperline; |
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src += lencopy; |
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/* Copy one line at a time */ |
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if (remain < bytesperline) |
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lencopy = remain; |
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else |
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lencopy = bytesperline; |
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/* |
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* Check if we have enough space left in the buffer. |
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* In that case, we force loop exit after copy. |
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*/ |
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if (lencopy > buf->bytesused - buf->length) { |
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lencopy = buf->bytesused - buf->length; |
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remain = lencopy; |
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} |
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/* Check if the copy is done */ |
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if (lencopy == 0 || remain == 0) |
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return; |
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if (lencopy < 0) { |
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printk_ratelimited(KERN_WARNING "stk1160: negative lencopy detected\n"); |
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return; |
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} |
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if ((unsigned long)dst + lencopy > |
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(unsigned long)buf->mem + buf->length) { |
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printk_ratelimited(KERN_WARNING "stk1160: buffer overflow detected\n"); |
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return; |
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} |
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memcpy(dst, src, lencopy); |
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remain -= lencopy; |
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buf->bytesused += lencopy; |
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buf->pos += lencopy; |
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} |
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} |
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/* |
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* Controls the isoc copy of each urb packet |
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*/ |
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static void stk1160_process_isoc(struct stk1160 *dev, struct urb *urb) |
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{ |
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int i, len, status; |
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u8 *p; |
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if (!dev) { |
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stk1160_warn("%s called with null device\n", __func__); |
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return; |
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} |
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if (urb->status < 0) { |
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/* Print status and drop current packet (or field?) */ |
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print_err_status(dev, -1, urb->status); |
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return; |
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} |
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for (i = 0; i < urb->number_of_packets; i++) { |
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status = urb->iso_frame_desc[i].status; |
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if (status < 0) { |
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print_err_status(dev, i, status); |
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continue; |
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} |
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/* Get packet actual length and pointer to data */ |
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p = urb->transfer_buffer + urb->iso_frame_desc[i].offset; |
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len = urb->iso_frame_desc[i].actual_length; |
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/* Empty packet */ |
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if (len <= 4) |
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continue; |
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/* |
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* An 8-byte packet sequence means end of field. |
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* So if we don't have any packet, we start receiving one now |
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* and if we do have a packet, then we are done with it. |
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* |
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* These end of field packets are always 0xc0 or 0x80, |
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* but not always 8-byte long so we don't check packet length. |
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*/ |
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if (p[0] == 0xc0) { |
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/* |
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* If first byte is 0xc0 then we received |
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* second field, and frame has ended. |
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*/ |
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if (dev->isoc_ctl.buf != NULL) |
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stk1160_buffer_done(dev); |
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dev->isoc_ctl.buf = stk1160_next_buffer(dev); |
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if (dev->isoc_ctl.buf == NULL) |
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return; |
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} |
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/* |
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* If we don't have a buffer here, then it means we |
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* haven't found the start mark sequence. |
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*/ |
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if (dev->isoc_ctl.buf == NULL) |
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continue; |
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if (p[0] == 0xc0 || p[0] == 0x80) { |
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/* We set next packet parity and |
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* continue to get next one |
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*/ |
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dev->isoc_ctl.buf->odd = *p & 0x40; |
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dev->isoc_ctl.buf->pos = 0; |
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continue; |
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} |
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stk1160_copy_video(dev, p, len); |
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} |
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} |
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/* |
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* IRQ callback, called by URB callback |
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*/ |
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static void stk1160_isoc_irq(struct urb *urb) |
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{ |
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int i, rc; |
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struct stk1160 *dev = urb->context; |
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switch (urb->status) { |
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case 0: |
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break; |
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case -ECONNRESET: /* kill */ |
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case -ENOENT: |
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case -ESHUTDOWN: |
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/* TODO: check uvc driver: he frees the queue here */ |
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return; |
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default: |
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stk1160_err("urb error! status %d\n", urb->status); |
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return; |
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} |
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stk1160_process_isoc(dev, urb); |
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/* Reset urb buffers */ |
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for (i = 0; i < urb->number_of_packets; i++) { |
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urb->iso_frame_desc[i].status = 0; |
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urb->iso_frame_desc[i].actual_length = 0; |
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} |
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rc = usb_submit_urb(urb, GFP_ATOMIC); |
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if (rc) |
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stk1160_err("urb re-submit failed (%d)\n", rc); |
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} |
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/* |
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* Cancel urbs |
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* This function can't be called in atomic context |
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*/ |
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void stk1160_cancel_isoc(struct stk1160 *dev) |
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{ |
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int i, num_bufs = dev->isoc_ctl.num_bufs; |
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/* |
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* This check is not necessary, but we add it |
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* to avoid a spurious debug message |
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*/ |
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if (!num_bufs) |
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return; |
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stk1160_dbg("killing %d urbs...\n", num_bufs); |
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for (i = 0; i < num_bufs; i++) { |
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/* |
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* To kill urbs we can't be in atomic context. |
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* We don't care for NULL pointer since |
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* usb_kill_urb allows it. |
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*/ |
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usb_kill_urb(dev->isoc_ctl.urb[i]); |
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} |
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stk1160_dbg("all urbs killed\n"); |
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} |
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/* |
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* Releases urb and transfer buffers |
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* Obviusly, associated urb must be killed before releasing it. |
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*/ |
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void stk1160_free_isoc(struct stk1160 *dev) |
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{ |
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struct urb *urb; |
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int i, num_bufs = dev->isoc_ctl.num_bufs; |
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stk1160_dbg("freeing %d urb buffers...\n", num_bufs); |
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for (i = 0; i < num_bufs; i++) { |
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urb = dev->isoc_ctl.urb[i]; |
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if (urb) { |
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if (dev->isoc_ctl.transfer_buffer[i]) { |
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#ifndef CONFIG_DMA_NONCOHERENT |
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usb_free_coherent(dev->udev, |
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urb->transfer_buffer_length, |
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dev->isoc_ctl.transfer_buffer[i], |
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urb->transfer_dma); |
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#else |
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kfree(dev->isoc_ctl.transfer_buffer[i]); |
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#endif |
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} |
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usb_free_urb(urb); |
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dev->isoc_ctl.urb[i] = NULL; |
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} |
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dev->isoc_ctl.transfer_buffer[i] = NULL; |
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} |
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kfree(dev->isoc_ctl.urb); |
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kfree(dev->isoc_ctl.transfer_buffer); |
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dev->isoc_ctl.urb = NULL; |
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dev->isoc_ctl.transfer_buffer = NULL; |
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dev->isoc_ctl.num_bufs = 0; |
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stk1160_dbg("all urb buffers freed\n"); |
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} |
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/* |
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* Helper for cancelling and freeing urbs |
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* This function can't be called in atomic context |
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*/ |
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void stk1160_uninit_isoc(struct stk1160 *dev) |
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{ |
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stk1160_cancel_isoc(dev); |
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stk1160_free_isoc(dev); |
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} |
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/* |
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* Allocate URBs |
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*/ |
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int stk1160_alloc_isoc(struct stk1160 *dev) |
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{ |
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struct urb *urb; |
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int i, j, k, sb_size, max_packets, num_bufs; |
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/* |
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* It may be necessary to release isoc here, |
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* since isoc are only released on disconnection. |
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* (see new_pkt_size flag) |
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*/ |
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if (dev->isoc_ctl.num_bufs) |
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stk1160_uninit_isoc(dev); |
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stk1160_dbg("allocating urbs...\n"); |
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num_bufs = STK1160_NUM_BUFS; |
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max_packets = STK1160_NUM_PACKETS; |
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sb_size = max_packets * dev->max_pkt_size; |
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dev->isoc_ctl.buf = NULL; |
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dev->isoc_ctl.max_pkt_size = dev->max_pkt_size; |
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dev->isoc_ctl.urb = kcalloc(num_bufs, sizeof(void *), GFP_KERNEL); |
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if (!dev->isoc_ctl.urb) { |
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stk1160_err("out of memory for urb array\n"); |
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return -ENOMEM; |
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} |
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dev->isoc_ctl.transfer_buffer = kcalloc(num_bufs, sizeof(void *), |
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GFP_KERNEL); |
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if (!dev->isoc_ctl.transfer_buffer) { |
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stk1160_err("out of memory for usb transfers\n"); |
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kfree(dev->isoc_ctl.urb); |
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return -ENOMEM; |
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} |
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/* allocate urbs and transfer buffers */ |
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for (i = 0; i < num_bufs; i++) { |
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urb = usb_alloc_urb(max_packets, GFP_KERNEL); |
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if (!urb) |
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goto free_i_bufs; |
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dev->isoc_ctl.urb[i] = urb; |
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#ifndef CONFIG_DMA_NONCOHERENT |
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dev->isoc_ctl.transfer_buffer[i] = usb_alloc_coherent(dev->udev, |
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sb_size, GFP_KERNEL, &urb->transfer_dma); |
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#else |
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dev->isoc_ctl.transfer_buffer[i] = kmalloc(sb_size, GFP_KERNEL); |
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#endif |
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if (!dev->isoc_ctl.transfer_buffer[i]) { |
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stk1160_err("cannot alloc %d bytes for tx[%d] buffer\n", |
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sb_size, i); |
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/* Not enough transfer buffers, so just give up */ |
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if (i < STK1160_MIN_BUFS) |
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goto free_i_bufs; |
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goto nomore_tx_bufs; |
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} |
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memset(dev->isoc_ctl.transfer_buffer[i], 0, sb_size); |
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/* |
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* FIXME: Where can I get the endpoint? |
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*/ |
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urb->dev = dev->udev; |
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urb->pipe = usb_rcvisocpipe(dev->udev, STK1160_EP_VIDEO); |
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urb->transfer_buffer = dev->isoc_ctl.transfer_buffer[i]; |
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urb->transfer_buffer_length = sb_size; |
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urb->complete = stk1160_isoc_irq; |
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urb->context = dev; |
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urb->interval = 1; |
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urb->start_frame = 0; |
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urb->number_of_packets = max_packets; |
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#ifndef CONFIG_DMA_NONCOHERENT |
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urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP; |
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#else |
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urb->transfer_flags = URB_ISO_ASAP; |
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#endif |
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k = 0; |
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for (j = 0; j < max_packets; j++) { |
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urb->iso_frame_desc[j].offset = k; |
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urb->iso_frame_desc[j].length = |
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dev->isoc_ctl.max_pkt_size; |
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k += dev->isoc_ctl.max_pkt_size; |
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} |
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} |
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stk1160_dbg("%d urbs allocated\n", num_bufs); |
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/* At last we can say we have some buffers */ |
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dev->isoc_ctl.num_bufs = num_bufs; |
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return 0; |
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nomore_tx_bufs: |
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/* |
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* Failed to allocate desired buffer count. However, we may have |
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* enough to work fine, so we just free the extra urb, |
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* store the allocated count and keep going, fingers crossed! |
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*/ |
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usb_free_urb(dev->isoc_ctl.urb[i]); |
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dev->isoc_ctl.urb[i] = NULL; |
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stk1160_warn("%d urbs allocated. Trying to continue...\n", i - 1); |
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dev->isoc_ctl.num_bufs = i - 1; |
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return 0; |
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free_i_bufs: |
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/* Save the allocated buffers so far, so we can properly free them */ |
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dev->isoc_ctl.num_bufs = i+1; |
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stk1160_free_isoc(dev); |
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return -ENOMEM; |
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} |
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