From c3d8692758dfaaf0049d6112c94c819de9237577 Mon Sep 17 00:00:00 2001 From: Patrice Chotard Date: Mon, 18 Apr 2011 17:37:06 -0300 Subject: [PATCH] [media] gspca - jeilinj: suppress workqueue MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Signed-off-by: Patrice CHOTARD Signed-off-by: Jean-François Moine Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/gspca/jeilinj.c | 192 +++++++++++----------------- 1 file changed, 77 insertions(+), 115 deletions(-) diff --git a/drivers/media/video/gspca/jeilinj.c b/drivers/media/video/gspca/jeilinj.c index 36dae38b1e38..33de1771b191 100644 --- a/drivers/media/video/gspca/jeilinj.c +++ b/drivers/media/video/gspca/jeilinj.c @@ -5,6 +5,7 @@ * download raw JPEG data. * * Copyright (C) 2009 Theodore Kilgore + * Copyright (C) 2011 Patrice Chotard * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -23,7 +24,6 @@ #define MODULE_NAME "jeilinj" -#include #include #include "gspca.h" #include "jpeg.h" @@ -38,25 +38,23 @@ MODULE_LICENSE("GPL"); /* Maximum transfer size to use. */ #define JEILINJ_MAX_TRANSFER 0x200 - #define FRAME_HEADER_LEN 0x10 +#define FRAME_START 0xFFFFFFFF /* Structure to hold all of our device specific stuff */ struct sd { struct gspca_dev gspca_dev; /* !! must be the first item */ + int blocks_left; const struct v4l2_pix_format *cap_mode; /* Driver stuff */ - struct work_struct work_struct; - struct workqueue_struct *work_thread; u8 quality; /* image quality */ - u8 jpegqual; /* webcam quality */ u8 jpeg_hdr[JPEG_HDR_SZ]; }; - struct jlj_command { - unsigned char instruction[2]; - unsigned char ack_wanted; - }; +struct jlj_command { + unsigned char instruction[2]; + unsigned char ack_wanted; +}; /* AFAICT these cameras will only do 320x240. */ static struct v4l2_pix_format jlj_mode[] = { @@ -107,6 +105,7 @@ static int jlj_start(struct gspca_dev *gspca_dev) int i; int retval = -1; u8 response = 0xff; + struct sd *sd = (struct sd *) gspca_dev; struct jlj_command start_commands[] = { {{0x71, 0x81}, 0}, {{0x70, 0x05}, 0}, @@ -136,6 +135,8 @@ static int jlj_start(struct gspca_dev *gspca_dev) {{0x71, 0x80}, 0}, {{0x70, 0x07}, 0} }; + + sd->blocks_left = 0; for (i = 0; i < ARRAY_SIZE(start_commands); i++) { retval = jlj_write2(gspca_dev, start_commands[i].instruction); if (retval < 0) @@ -149,102 +150,47 @@ static int jlj_start(struct gspca_dev *gspca_dev) return retval; } -static int jlj_stop(struct gspca_dev *gspca_dev) -{ - int i; - int retval; - struct jlj_command stop_commands[] = { - {{0x71, 0x00}, 0}, - {{0x70, 0x09}, 0}, - {{0x71, 0x80}, 0}, - {{0x70, 0x05}, 0} - }; - for (i = 0; i < ARRAY_SIZE(stop_commands); i++) { - retval = jlj_write2(gspca_dev, stop_commands[i].instruction); - if (retval < 0) - return retval; - } - return retval; -} - -/* This function is called as a workqueue function and runs whenever the camera - * is streaming data. Because it is a workqueue function it is allowed to sleep - * so we can use synchronous USB calls. To avoid possible collisions with other - * threads attempting to use the camera's USB interface the gspca usb_lock is - * used when performing the one USB control operation inside the workqueue, - * which tells the camera to close the stream. In practice the only thing - * which needs to be protected against is the usb_set_interface call that - * gspca makes during stream_off. Otherwise the camera doesn't provide any - * controls that the user could try to change. - */ - -static void jlj_dostream(struct work_struct *work) +static void sd_pkt_scan(struct gspca_dev *gspca_dev, + u8 *data, int len) { - struct sd *dev = container_of(work, struct sd, work_struct); - struct gspca_dev *gspca_dev = &dev->gspca_dev; - int blocks_left; /* 0x200-sized blocks remaining in current frame. */ - int act_len; + struct sd *sd = (struct sd *) gspca_dev; int packet_type; - int ret; - u8 *buffer; + u32 header_marker; - buffer = kmalloc(JEILINJ_MAX_TRANSFER, GFP_KERNEL | GFP_DMA); - if (!buffer) { - err("Couldn't allocate USB buffer"); - goto quit_stream; + PDEBUG(D_STREAM, "Got %d bytes out of %d for Block 0", + len, JEILINJ_MAX_TRANSFER); + if (len != JEILINJ_MAX_TRANSFER) { + PDEBUG(D_PACK, "bad length"); + goto discard; } - while (gspca_dev->present && gspca_dev->streaming) { - /* - * Now request data block 0. Line 0 reports the size - * to download, in blocks of size 0x200, and also tells the - * "actual" data size, in bytes, which seems best to ignore. - */ - ret = usb_bulk_msg(gspca_dev->dev, - usb_rcvbulkpipe(gspca_dev->dev, 0x82), - buffer, JEILINJ_MAX_TRANSFER, &act_len, - JEILINJ_DATA_TIMEOUT); - PDEBUG(D_STREAM, - "Got %d bytes out of %d for Block 0", - act_len, JEILINJ_MAX_TRANSFER); - if (ret < 0 || act_len < FRAME_HEADER_LEN) - goto quit_stream; - blocks_left = buffer[0x0a] - 1; - PDEBUG(D_STREAM, "blocks_left = 0x%x", blocks_left); - + /* check if it's start of frame */ + header_marker = ((u32 *)data)[0]; + if (header_marker == FRAME_START) { + sd->blocks_left = data[0x0a] - 1; + PDEBUG(D_STREAM, "blocks_left = 0x%x", sd->blocks_left); /* Start a new frame, and add the JPEG header, first thing */ gspca_frame_add(gspca_dev, FIRST_PACKET, - dev->jpeg_hdr, JPEG_HDR_SZ); + sd->jpeg_hdr, JPEG_HDR_SZ); /* Toss line 0 of data block 0, keep the rest. */ gspca_frame_add(gspca_dev, INTER_PACKET, - buffer + FRAME_HEADER_LEN, + data + FRAME_HEADER_LEN, JEILINJ_MAX_TRANSFER - FRAME_HEADER_LEN); - - while (blocks_left > 0) { - if (!gspca_dev->present) - goto quit_stream; - ret = usb_bulk_msg(gspca_dev->dev, - usb_rcvbulkpipe(gspca_dev->dev, 0x82), - buffer, JEILINJ_MAX_TRANSFER, &act_len, - JEILINJ_DATA_TIMEOUT); - if (ret < 0 || act_len < JEILINJ_MAX_TRANSFER) - goto quit_stream; - PDEBUG(D_STREAM, - "%d blocks remaining for frame", blocks_left); - blocks_left -= 1; - if (blocks_left == 0) - packet_type = LAST_PACKET; - else - packet_type = INTER_PACKET; - gspca_frame_add(gspca_dev, packet_type, - buffer, JEILINJ_MAX_TRANSFER); - } - } -quit_stream: - mutex_lock(&gspca_dev->usb_lock); - if (gspca_dev->present) - jlj_stop(gspca_dev); - mutex_unlock(&gspca_dev->usb_lock); - kfree(buffer); + } else if (sd->blocks_left > 0) { + PDEBUG(D_STREAM, "%d blocks remaining for frame", + sd->blocks_left); + sd->blocks_left -= 1; + if (sd->blocks_left == 0) + packet_type = LAST_PACKET; + else + packet_type = INTER_PACKET; + gspca_frame_add(gspca_dev, packet_type, + data, JEILINJ_MAX_TRANSFER); + } else + goto discard; + return; +discard: + /* Discard data until a new frame starts. */ + gspca_dev->last_packet_type = DISCARD_PACKET; } /* This function is called at probe time just before sd_init */ @@ -255,31 +201,50 @@ static int sd_config(struct gspca_dev *gspca_dev, struct sd *dev = (struct sd *) gspca_dev; dev->quality = 85; - dev->jpegqual = 85; PDEBUG(D_PROBE, "JEILINJ camera detected" " (vid/pid 0x%04X:0x%04X)", id->idVendor, id->idProduct); cam->cam_mode = jlj_mode; cam->nmodes = 1; cam->bulk = 1; - /* We don't use the buffer gspca allocates so make it small. */ - cam->bulk_size = 32; - INIT_WORK(&dev->work_struct, jlj_dostream); + cam->bulk_nurbs = 1; + cam->bulk_size = JEILINJ_MAX_TRANSFER; return 0; } -/* called on streamoff with alt==0 and on disconnect */ -/* the usb_lock is held at entry - restore on exit */ -static void sd_stop0(struct gspca_dev *gspca_dev) +static void sd_stopN(struct gspca_dev *gspca_dev) { - struct sd *dev = (struct sd *) gspca_dev; + int i; + u8 *buf; + u8 stop_commands[][2] = { + {0x71, 0x00}, + {0x70, 0x09}, + {0x71, 0x80}, + {0x70, 0x05} + }; + + for (;;) { + /* get the image remaining blocks */ + usb_bulk_msg(gspca_dev->dev, + gspca_dev->urb[0]->pipe, + gspca_dev->urb[0]->transfer_buffer, + JEILINJ_MAX_TRANSFER, NULL, + JEILINJ_DATA_TIMEOUT); - /* wait for the work queue to terminate */ - mutex_unlock(&gspca_dev->usb_lock); - /* This waits for jlj_dostream to finish */ - destroy_workqueue(dev->work_thread); - dev->work_thread = NULL; - mutex_lock(&gspca_dev->usb_lock); + /* search for 0xff 0xd9 (EOF for JPEG) */ + i = 0; + buf = gspca_dev->urb[0]->transfer_buffer; + while ((i < (JEILINJ_MAX_TRANSFER - 1)) && + ((buf[i] != 0xff) || (buf[i+1] != 0xd9))) + i++; + + if (i != (JEILINJ_MAX_TRANSFER - 1)) + /* last remaining block found */ + break; + } + + for (i = 0; i < ARRAY_SIZE(stop_commands); i++) + jlj_write2(gspca_dev, stop_commands[i]); } /* this function is called at probe and resume time */ @@ -304,10 +269,6 @@ static int sd_start(struct gspca_dev *gspca_dev) PDEBUG(D_ERR, "Start streaming command failed"); return ret; } - /* Start the workqueue function to do the streaming */ - dev->work_thread = create_singlethread_workqueue(MODULE_NAME); - queue_work(dev->work_thread, &dev->work_struct); - return 0; } @@ -325,7 +286,8 @@ static const struct sd_desc sd_desc = { .config = sd_config, .init = sd_init, .start = sd_start, - .stop0 = sd_stop0, + .stopN = sd_stopN, + .pkt_scan = sd_pkt_scan, }; /* -- device connect -- */ -- 2.30.2