From 2bd30b8dc75b823dd7bbef9d7bc68e1fd7ecee5c Mon Sep 17 00:00:00 2001 From: Sang-Heon Jeon Date: Mon, 24 Aug 2026 01:18:14 +0900 Subject: coccinelle: alloc_cast: drop removed allocators - pci_alloc_consistent() and pci_zalloc_consistent() were removed by commit 7968778914e5 ("PCI: Remove the deprecated "pci-dma-compat.h" API") - kmem_alloc() was removed by commit f078d4ea8276 ("xfs: convert kmem_alloc() to kmalloc()") - kmem_zalloc() was removed by commit 10634530f7ba ("xfs: convert kmem_zalloc() to kzalloc()") - kmem_zone_alloc() and kmem_zone_zalloc() were removed by commit bae633a4a283 ("xfs: remove xfs_zone_{alloc,zalloc} helpers") So drop them from the rules. No functional change. Signed-off-by: Sang-Heon Jeon Signed-off-by: Julia Lawall --- sound/usb/helper.c | 167 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 167 insertions(+) create mode 100644 sound/usb/helper.c (limited to 'sound/usb/helper.c') diff --git a/sound/usb/helper.c b/sound/usb/helper.c new file mode 100644 index 000000000..497d2b27f --- /dev/null +++ b/sound/usb/helper.c @@ -0,0 +1,167 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + */ + +#include +#include +#include + +#include "usbaudio.h" +#include "helper.h" +#include "quirks.h" + +/* + * combine bytes and get an integer value + */ +unsigned int snd_usb_combine_bytes(unsigned char *bytes, int size) +{ + switch (size) { + case 1: return *bytes; + case 2: return combine_word(bytes); + case 3: return combine_triple(bytes); + case 4: return combine_quad(bytes); + default: return 0; + } +} + +/* + * parse descriptor buffer and return the pointer starting the given + * descriptor type. + */ +void *snd_usb_find_desc(void *descstart, int desclen, void *after, u8 dtype) +{ + u8 *p, *end, *next; + + p = descstart; + end = p + desclen; + for (; p < end;) { + if (p[0] < 2) + return NULL; + next = p + p[0]; + if (next > end) + return NULL; + if (p[1] == dtype && (!after || (void *)p > after)) { + return p; + } + p = next; + } + return NULL; +} + +/* + * find a class-specified interface descriptor with the given subtype. + */ +void *snd_usb_find_csint_desc(void *buffer, int buflen, void *after, u8 dsubtype) +{ + unsigned char *p = after; + + while ((p = snd_usb_find_desc(buffer, buflen, p, + USB_DT_CS_INTERFACE)) != NULL) { + if (p[0] >= 3 && p[2] == dsubtype) + return p; + } + return NULL; +} +EXPORT_SYMBOL_GPL(snd_usb_find_csint_desc); + +/* + * Wrapper for usb_control_msg(). + * Allocates a temp buffer to prevent dmaing from/to the stack. + */ +int snd_usb_ctl_msg(struct usb_device *dev, unsigned int pipe, __u8 request, + __u8 requesttype, __u16 value, __u16 index, void *data, + __u16 size) +{ + int err; + void *buf = NULL; + int timeout; + + if (usb_pipe_type_check(dev, pipe)) + return -EINVAL; + + if (size > 0) { + buf = kmemdup(data, size, GFP_KERNEL); + if (!buf) + return -ENOMEM; + } + + if (requesttype & USB_DIR_IN) + timeout = USB_CTRL_GET_TIMEOUT; + else + timeout = USB_CTRL_SET_TIMEOUT; + + err = usb_control_msg(dev, pipe, request, requesttype, + value, index, buf, size, timeout); + + if (size > 0) { + memcpy(data, buf, size); + kfree(buf); + } + + snd_usb_ctl_msg_quirk(dev, pipe, request, requesttype, + value, index, data, size); + + return err; +} + +unsigned char snd_usb_parse_datainterval(struct snd_usb_audio *chip, + struct usb_host_interface *alts) +{ + switch (snd_usb_get_speed(chip->dev)) { + case USB_SPEED_HIGH: + case USB_SPEED_SUPER: + case USB_SPEED_SUPER_PLUS: + if (get_endpoint(alts, 0)->bInterval >= 1 && + get_endpoint(alts, 0)->bInterval <= 4) + return get_endpoint(alts, 0)->bInterval - 1; + break; + default: + break; + } + return 0; +} + +struct usb_host_interface * +snd_usb_get_host_interface(struct snd_usb_audio *chip, int ifnum, int altsetting) +{ + struct usb_interface *iface; + + iface = usb_ifnum_to_if(chip->dev, ifnum); + if (!iface) + return NULL; + return usb_altnum_to_altsetting(iface, altsetting); +} + +int snd_usb_add_ctrl_interface_link(struct snd_usb_audio *chip, int ifnum, + int ctrlif) +{ + struct usb_device *dev = chip->dev; + struct usb_host_interface *host_iface; + + if (chip->num_intf_to_ctrl >= MAX_CARD_INTERFACES) { + dev_info(&dev->dev, "Too many interfaces assigned to the single USB-audio card\n"); + return -EINVAL; + } + + /* find audiocontrol interface */ + host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0]; + + chip->intf_to_ctrl[chip->num_intf_to_ctrl].interface = ifnum; + chip->intf_to_ctrl[chip->num_intf_to_ctrl].ctrl_intf = host_iface; + chip->num_intf_to_ctrl++; + + return 0; +} + +struct usb_host_interface *snd_usb_find_ctrl_interface(struct snd_usb_audio *chip, + int ifnum) +{ + int i; + + for (i = 0; i < chip->num_intf_to_ctrl; ++i) + if (chip->intf_to_ctrl[i].interface == ifnum) + return chip->intf_to_ctrl[i].ctrl_intf; + + /* Fallback to first audiocontrol interface */ + return chip->ctrl_intf; +} -- cgit v1.3.1