X-Git-Url: https://git.ao2.it/libam7xxx.git/blobdiff_plain/701cb208fb160d2f14aff1b9cd425c481e2b003a..c71788d6309eafd1d0bdc503ebb75055c43c0416:/src/am7xxx.c diff --git a/src/am7xxx.c b/src/am7xxx.c index 7122658..89eaab4 100644 --- a/src/am7xxx.c +++ b/src/am7xxx.c @@ -1,6 +1,6 @@ /* am7xxx - communication with AM7xxx based USB Pico Projectors and DPFs * - * Copyright (C) 2012 Antonio Ospite + * Copyright (C) 2012-2014 Antonio Ospite * * 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 @@ -385,8 +385,8 @@ static int read_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len) ret = libusb_bulk_transfer(dev->usb_device, 0x81, buffer, len, &transferred, 0); if (ret != 0 || (unsigned int)transferred != len) { - error(dev->ctx, "ret: %d\ttransferred: %d (expected %u)\n", - ret, transferred, len); + error(dev->ctx, "%s. Transferred: %d (expected %u)\n", + libusb_error_name(ret), transferred, len); return ret; } @@ -404,8 +404,8 @@ static int send_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len) ret = libusb_bulk_transfer(dev->usb_device, 0x1, buffer, len, &transferred, 0); if (ret != 0 || (unsigned int)transferred != len) { - error(dev->ctx, "ret: %d\ttransferred: %d (expected %u)\n", - ret, transferred, len); + error(dev->ctx, "%s. Transferred: %d (expected %u)\n", + libusb_error_name(ret), transferred, len); return ret; } @@ -702,6 +702,83 @@ static am7xxx_device *find_device(am7xxx_context *ctx, return current; } +static int open_device(am7xxx_context *ctx, + unsigned int device_index, + libusb_device *usb_dev, + am7xxx_device **dev) +{ + int ret; + int current_configuration; + + *dev = find_device(ctx, device_index); + if (*dev == NULL) { + ret = -ENODEV; + goto out; + } + + /* the usb device has already been opened */ + if ((*dev)->usb_device) { + debug(ctx, "(*dev)->usb_device already set\n"); + ret = 1; + goto out; + } + + ret = libusb_open(usb_dev, &((*dev)->usb_device)); + if (ret < 0) { + debug(ctx, "libusb_open failed: %s\n", libusb_error_name(ret)); + goto out; + } + + /* XXX, the device is now open, if any of the calls below fail we need + * to close it again before bailing out. + */ + + current_configuration = -1; + libusb_get_configuration((*dev)->usb_device, ¤t_configuration); + if (current_configuration != (*dev)->desc->configuration) { + ret = libusb_set_configuration((*dev)->usb_device, + (*dev)->desc->configuration); + if (ret < 0) { + debug(ctx, "libusb_set_configuration failed: %s\n", + libusb_error_name(ret)); + debug(ctx, "Cannot set configuration %hhu\n", + (*dev)->desc->configuration); + goto out_libusb_close; + } + } + + libusb_set_auto_detach_kernel_driver((*dev)->usb_device, 1); + + ret = libusb_claim_interface((*dev)->usb_device, + (*dev)->desc->interface_number); + if (ret < 0) { + debug(ctx, "libusb_claim_interface failed: %s\n", + libusb_error_name(ret)); + debug(ctx, "Cannot claim interface %hhu\n", + (*dev)->desc->interface_number); + goto out_libusb_close; + } + + /* Checking that the configuration has not changed, as suggested in + * http://libusb.sourceforge.net/api-1.0/caveats.html + */ + current_configuration = -1; + libusb_get_configuration((*dev)->usb_device, ¤t_configuration); + if (current_configuration != (*dev)->desc->configuration) { + debug(ctx, "libusb configuration changed\n"); + debug(ctx, "Cannot claim interface %hhu\n", + (*dev)->desc->interface_number); + goto out_libusb_close; + } +out: + return ret; + +out_libusb_close: + libusb_close((*dev)->usb_device); + (*dev)->usb_device = NULL; + return ret; +} + typedef enum { SCAN_OP_BUILD_DEVLIST, SCAN_OP_OPEN_DEVICE, @@ -711,13 +788,14 @@ typedef enum { * This is where the central logic of multi-device support is. * * When 'op' == SCAN_OP_BUILD_DEVLIST the parameters 'open_device_index' and - * 'dev' are ignored; the function returns 0 on success and a negative value + * 'dev' are ignored; the function returns 0 on success or a negative value * on error. * * When 'op' == SCAN_OP_OPEN_DEVICE the function opens the supported USB * device with index 'open_device_index' and returns the correspondent - * am7xxx_device in the 'dev' parameter; the function returns 0 on success, - * 1 if the device was already open and a negative value on error. + * am7xxx_device in the 'dev' parameter; the function returns the value from + * open_device(), which is 0 on success, 1 if the device was already open or + * a negative value on error. * * NOTES: * if scan_devices() fails when called with 'op' == SCAN_OP_BUILD_DEVLIST, @@ -728,7 +806,7 @@ static int scan_devices(am7xxx_context *ctx, scan_op op, unsigned int open_device_index, am7xxx_device **dev) { ssize_t num_devices; - libusb_device** list; + libusb_device **list; unsigned int current_index; int i; int ret; @@ -780,51 +858,16 @@ static int scan_devices(am7xxx_context *ctx, scan_op op, } else if (op == SCAN_OP_OPEN_DEVICE && current_index == open_device_index) { - *dev = find_device(ctx, open_device_index); - if (*dev == NULL) { - ret = -ENODEV; - goto out; - } - - /* the usb device has already been opened */ - if ((*dev)->usb_device) { - debug(ctx, "(*dev)->usb_device already set\n"); - ret = 1; - goto out; - } - - ret = libusb_open(list[i], &((*dev)->usb_device)); - if (ret < 0) { - debug(ctx, "libusb_open failed\n"); - goto out; - } - - /* XXX, the device is now open, if any - * of the calls below fail we need to - * close it again before bailing out. - */ - - ret = libusb_set_configuration((*dev)->usb_device, - (*dev)->desc->configuration); - if (ret < 0) { - debug(ctx, "libusb_set_configuration failed\n"); - debug(ctx, "Cannot set configuration %hhu\n", - (*dev)->desc->configuration); - goto out_libusb_close; - } - - ret = libusb_claim_interface((*dev)->usb_device, - (*dev)->desc->interface_number); - if (ret < 0) { - debug(ctx, "libusb_claim_interface failed\n"); - debug(ctx, "Cannot claim interface %hhu\n", - (*dev)->desc->interface_number); -out_libusb_close: - libusb_close((*dev)->usb_device); - (*dev)->usb_device = NULL; - goto out; - } + ret = open_device(ctx, + open_device_index, + list[i], + dev); + if (ret < 0) + debug(ctx, "open_device failed\n"); + /* exit the loop unconditionally after + * attempting to open the device + * requested by the user */ goto out; } current_index++; @@ -832,7 +875,8 @@ out_libusb_close: } } - /* if we made it up to here we didn't find any device to open */ + /* if we made it up to here when op == SCAN_OP_OPEN_DEVICE, + * no devices to open had been found. */ if (op == SCAN_OP_OPEN_DEVICE) { error(ctx, "Cannot find any device to open\n"); ret = -ENODEV;