blob: 5a1974e7b1ec7cb78ef84535aba22a22903399a9 [file] [log] [blame]
/* Copyright (c) 2016-2017, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/debugfs.h>
#include <linux/usb/audio.h>
#include <linux/usb/audio-v2.h>
#include <linux/uaccess.h>
#include <sound/pcm.h>
#include <sound/core.h>
#include <sound/asound.h>
#include <linux/usb.h>
#include <linux/qmi_encdec.h>
#include <soc/qcom/msm_qmi_interface.h>
#include <linux/iommu.h>
#include <linux/platform_device.h>
#include "usbaudio.h"
#include "card.h"
#include "helper.h"
#include "pcm.h"
#include "usb_audio_qmi_v01.h"
#define SND_PCM_CARD_NUM_MASK 0xffff0000
#define SND_PCM_DEV_NUM_MASK 0xff00
#define SND_PCM_STREAM_DIRECTION 0xff
#define PREPEND_SID_TO_IOVA(iova, sid) (u64)(((u64)(iova)) | \
(((u64)sid) << 32))
/* event ring iova base address */
#define IOVA_BASE 0x1000
#define IOVA_DCBA_BASE 0x2000
#define IOVA_XFER_RING_BASE (IOVA_DCBA_BASE + PAGE_SIZE * (SNDRV_CARDS + 1))
#define IOVA_XFER_BUF_BASE (IOVA_XFER_RING_BASE + PAGE_SIZE * SNDRV_CARDS * 32)
#define IOVA_XFER_RING_MAX (IOVA_XFER_BUF_BASE - PAGE_SIZE)
#define IOVA_XFER_BUF_MAX (0xfffff000 - PAGE_SIZE)
#define MAX_XFER_BUFF_LEN (24 * PAGE_SIZE)
struct iova_info {
struct list_head list;
unsigned long start_iova;
size_t size;
bool in_use;
};
struct intf_info {
unsigned long data_xfer_ring_va;
size_t data_xfer_ring_size;
unsigned long sync_xfer_ring_va;
size_t sync_xfer_ring_size;
unsigned long xfer_buf_va;
size_t xfer_buf_size;
phys_addr_t xfer_buf_pa;
u8 *xfer_buf;
u8 intf_num;
u8 pcm_card_num;
u8 pcm_dev_num;
u8 direction;
bool in_use;
};
struct uaudio_dev {
struct usb_device *udev;
/* audio control interface */
struct usb_host_interface *ctrl_intf;
unsigned int card_num;
atomic_t in_use;
struct kref kref;
unsigned long dcba_iova;
size_t dcba_size;
wait_queue_head_t disconnect_wq;
/* interface specific */
int num_intf;
struct intf_info *info;
};
static struct uaudio_dev uadev[SNDRV_CARDS];
struct uaudio_qmi_dev {
struct device *dev;
u32 sid;
u32 intr_num;
struct iommu_domain *domain;
/* list to keep track of available iova */
struct list_head dcba_list;
size_t dcba_iova_size;
unsigned long curr_dcba_iova;
struct list_head xfer_ring_list;
size_t xfer_ring_iova_size;
unsigned long curr_xfer_ring_iova;
struct list_head xfer_buf_list;
size_t xfer_buf_iova_size;
unsigned long curr_xfer_buf_iova;
/* bit fields representing pcm card enabled */
unsigned long card_slot;
/* cache event ring phys addr */
u64 er_phys_addr;
};
static struct uaudio_qmi_dev *uaudio_qdev;
struct uaudio_qmi_svc {
struct qmi_handle *uaudio_svc_hdl;
void *curr_conn;
struct work_struct recv_msg_work;
struct work_struct qmi_disconnect_work;
struct workqueue_struct *uaudio_wq;
ktime_t t_request_recvd;
ktime_t t_resp_sent;
};
static struct uaudio_qmi_svc *uaudio_svc;
static struct msg_desc uaudio_stream_req_desc = {
.max_msg_len = QMI_UAUDIO_STREAM_REQ_MSG_V01_MAX_MSG_LEN,
.msg_id = QMI_UAUDIO_STREAM_REQ_V01,
.ei_array = qmi_uaudio_stream_req_msg_v01_ei,
};
static struct msg_desc uaudio_stream_resp_desc = {
.max_msg_len = QMI_UAUDIO_STREAM_RESP_MSG_V01_MAX_MSG_LEN,
.msg_id = QMI_UAUDIO_STREAM_RESP_V01,
.ei_array = qmi_uaudio_stream_resp_msg_v01_ei,
};
static struct msg_desc uaudio_stream_ind_desc = {
.max_msg_len = QMI_UAUDIO_STREAM_IND_MSG_V01_MAX_MSG_LEN,
.msg_id = QMI_UADUIO_STREAM_IND_V01,
.ei_array = qmi_uaudio_stream_ind_msg_v01_ei,
};
enum mem_type {
MEM_EVENT_RING,
MEM_DCBA,
MEM_XFER_RING,
MEM_XFER_BUF,
};
enum usb_qmi_audio_format {
USB_QMI_PCM_FORMAT_S8 = 0,
USB_QMI_PCM_FORMAT_U8,
USB_QMI_PCM_FORMAT_S16_LE,
USB_QMI_PCM_FORMAT_S16_BE,
USB_QMI_PCM_FORMAT_U16_LE,
USB_QMI_PCM_FORMAT_U16_BE,
USB_QMI_PCM_FORMAT_S24_LE,
USB_QMI_PCM_FORMAT_S24_BE,
USB_QMI_PCM_FORMAT_U24_LE,
USB_QMI_PCM_FORMAT_U24_BE,
USB_QMI_PCM_FORMAT_S24_3LE,
USB_QMI_PCM_FORMAT_S24_3BE,
USB_QMI_PCM_FORMAT_U24_3LE,
USB_QMI_PCM_FORMAT_U24_3BE,
USB_QMI_PCM_FORMAT_S32_LE,
USB_QMI_PCM_FORMAT_S32_BE,
USB_QMI_PCM_FORMAT_U32_LE,
USB_QMI_PCM_FORMAT_U32_BE,
};
static unsigned long uaudio_get_iova(unsigned long *curr_iova,
size_t *curr_iova_size, struct list_head *head, size_t size)
{
struct iova_info *info, *new_info = NULL;
struct list_head *curr_head;
unsigned long va = 0;
size_t tmp_size = size;
bool found = false;
if (size % PAGE_SIZE) {
pr_err("%s: size %zu is not page size multiple\n", __func__,
size);
goto done;
}
if (size > *curr_iova_size) {
pr_err("%s: size %zu > curr size %zu\n", __func__, size,
*curr_iova_size);
goto done;
}
if (*curr_iova_size == 0) {
pr_err("%s: iova mapping is full\n", __func__);
goto done;
}
list_for_each_entry(info, head, list) {
/* exact size iova_info */
if (!info->in_use && info->size == size) {
info->in_use = true;
va = info->start_iova;
*curr_iova_size -= size;
found = true;
pr_debug("%s: exact size :%zu found\n", __func__, size);
goto done;
} else if (!info->in_use && tmp_size >= info->size) {
if (!new_info)
new_info = info;
pr_debug("%s: partial size: %zu found\n", __func__,
info->size);
tmp_size -= info->size;
if (tmp_size)
continue;
va = new_info->start_iova;
for (curr_head = &new_info->list; curr_head !=
&info->list; curr_head = curr_head->next) {
new_info = list_entry(curr_head, struct
iova_info, list);
new_info->in_use = true;
}
info->in_use = true;
*curr_iova_size -= size;
found = true;
goto done;
} else {
/* iova region in use */
new_info = NULL;
tmp_size = size;
}
}
info = kzalloc(sizeof(struct iova_info), GFP_KERNEL);
if (!info) {
va = 0;
goto done;
}
va = info->start_iova = *curr_iova;
info->size = size;
info->in_use = true;
*curr_iova += size;
*curr_iova_size -= size;
found = true;
list_add_tail(&info->list, head);
done:
if (!found)
pr_err("%s: unable to find %zu size iova\n", __func__, size);
else
pr_debug("%s: va:%lu curr_iova:%lu curr_iova_size:%zu\n",
__func__, va, *curr_iova, *curr_iova_size);
return va;
}
static unsigned long uaudio_iommu_map(enum mem_type mtype, phys_addr_t pa,
size_t size)
{
unsigned long va = 0;
bool map = true;
int ret;
switch (mtype) {
case MEM_EVENT_RING:
va = IOVA_BASE;
/* er already mapped */
if (uaudio_qdev->er_phys_addr == pa)
map = false;
break;
case MEM_DCBA:
va = uaudio_get_iova(&uaudio_qdev->curr_dcba_iova,
&uaudio_qdev->dcba_iova_size, &uaudio_qdev->dcba_list, size);
break;
case MEM_XFER_RING:
va = uaudio_get_iova(&uaudio_qdev->curr_xfer_ring_iova,
&uaudio_qdev->xfer_ring_iova_size, &uaudio_qdev->xfer_ring_list,
size);
break;
case MEM_XFER_BUF:
va = uaudio_get_iova(&uaudio_qdev->curr_xfer_buf_iova,
&uaudio_qdev->xfer_buf_iova_size, &uaudio_qdev->xfer_buf_list,
size);
break;
default:
pr_err("%s: unknown mem type %d\n", __func__, mtype);
}
if (!va)
map = false;
if (!map)
goto done;
pr_debug("%s: map pa %pa to iova %lu for memtype %d\n", __func__, &pa,
va, mtype);
ret = iommu_map(uaudio_qdev->domain, va, pa, size,
IOMMU_READ | IOMMU_WRITE | IOMMU_MMIO);
if (ret)
pr_err("%s:failed to map pa:%pa iova:%lu memtype:%d ret:%d\n",
__func__, &pa, va, mtype, ret);
done:
return va;
}
static void uaudio_put_iova(unsigned long va, size_t size, struct list_head
*head, size_t *curr_iova_size)
{
struct iova_info *info;
size_t tmp_size = size;
bool found = false;
list_for_each_entry(info, head, list) {
if (info->start_iova == va) {
if (!info->in_use) {
pr_err("%s: va %lu is not in use\n", __func__,
va);
return;
}
found = true;
info->in_use = false;
if (info->size == size)
goto done;
}
if (found && tmp_size >= info->size) {
info->in_use = false;
tmp_size -= info->size;
if (!tmp_size)
goto done;
}
}
if (!found) {
pr_err("%s: unable to find the va %lu\n", __func__, va);
return;
}
done:
*curr_iova_size += size;
pr_debug("%s: curr_iova_size %zu\n", __func__, *curr_iova_size);
}
static void uaudio_iommu_unmap(enum mem_type mtype, unsigned long va,
size_t size)
{
size_t umap_size;
bool unmap = true;
if (!va || !size)
return;
switch (mtype) {
case MEM_EVENT_RING:
if (uaudio_qdev->er_phys_addr)
uaudio_qdev->er_phys_addr = 0;
else
unmap = false;
break;
case MEM_DCBA:
uaudio_put_iova(va, size, &uaudio_qdev->dcba_list,
&uaudio_qdev->dcba_iova_size);
break;
case MEM_XFER_RING:
uaudio_put_iova(va, size, &uaudio_qdev->xfer_ring_list,
&uaudio_qdev->xfer_ring_iova_size);
break;
case MEM_XFER_BUF:
uaudio_put_iova(va, size, &uaudio_qdev->xfer_buf_list,
&uaudio_qdev->xfer_buf_iova_size);
break;
default:
pr_err("%s: unknown mem type %d\n", __func__, mtype);
unmap = false;
}
if (!unmap)
return;
pr_debug("%s: unmap iova %lu for memtype %d\n", __func__, va, mtype);
umap_size = iommu_unmap(uaudio_qdev->domain, va, size);
if (umap_size != size)
pr_err("%s: unmapped size %zu for iova %lu\n", __func__,
umap_size, va);
}
static int prepare_qmi_response(struct snd_usb_substream *subs,
struct qmi_uaudio_stream_req_msg_v01 *req_msg,
struct qmi_uaudio_stream_resp_msg_v01 *resp, int info_idx)
{
struct usb_interface *iface;
struct usb_host_interface *alts;
struct usb_interface_descriptor *altsd;
struct usb_host_endpoint *ep;
struct uac_format_type_i_continuous_descriptor *fmt;
struct uac_format_type_i_discrete_descriptor *fmt_v1;
struct uac_format_type_i_ext_descriptor *fmt_v2;
struct uac1_as_header_descriptor *as;
int ret = -ENODEV;
int protocol, card_num, pcm_dev_num;
void *hdr_ptr;
u8 *xfer_buf;
u32 len, mult, remainder, xfer_buf_len;
unsigned long va, tr_data_va = 0, tr_sync_va = 0, dcba_va = 0,
xfer_buf_va = 0;
phys_addr_t xhci_pa, xfer_buf_pa;
iface = usb_ifnum_to_if(subs->dev, subs->interface);
if (!iface) {
pr_err("%s: interface # %d does not exist\n", __func__,
subs->interface);
goto err;
}
pcm_dev_num = (req_msg->usb_token & SND_PCM_DEV_NUM_MASK) >> 8;
card_num = (req_msg->usb_token & SND_PCM_CARD_NUM_MASK) >> 16;
xfer_buf_len = req_msg->xfer_buff_size;
alts = &iface->altsetting[subs->altset_idx];
altsd = get_iface_desc(alts);
protocol = altsd->bInterfaceProtocol;
/* get format type */
fmt = snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL,
UAC_FORMAT_TYPE);
if (!fmt) {
pr_err("%s: %u:%d : no UAC_FORMAT_TYPE desc\n", __func__,
subs->interface, subs->altset_idx);
goto err;
}
if (!uadev[card_num].ctrl_intf) {
pr_err("%s: audio ctrl intf info not cached\n", __func__);
goto err;
}
hdr_ptr = snd_usb_find_csint_desc(uadev[card_num].ctrl_intf->extra,
uadev[card_num].ctrl_intf->extralen,
NULL, UAC_HEADER);
if (!hdr_ptr) {
pr_err("%s: no UAC_HEADER desc\n", __func__);
goto err;
}
if (protocol == UAC_VERSION_1) {
as = snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL,
UAC_AS_GENERAL);
if (!as) {
pr_err("%s: %u:%d : no UAC_AS_GENERAL desc\n", __func__,
subs->interface, subs->altset_idx);
goto err;
}
resp->data_path_delay = as->bDelay;
resp->data_path_delay_valid = 1;
fmt_v1 = (struct uac_format_type_i_discrete_descriptor *)fmt;
resp->usb_audio_subslot_size = fmt_v1->bSubframeSize;
resp->usb_audio_subslot_size_valid = 1;
resp->usb_audio_spec_revision =
((struct uac1_ac_header_descriptor *)hdr_ptr)->bcdADC;
resp->usb_audio_spec_revision_valid = 1;
} else if (protocol == UAC_VERSION_2) {
fmt_v2 = (struct uac_format_type_i_ext_descriptor *)fmt;
resp->usb_audio_subslot_size = fmt_v2->bSubslotSize;
resp->usb_audio_subslot_size_valid = 1;
resp->usb_audio_spec_revision =
((struct uac2_ac_header_descriptor *)hdr_ptr)->bcdADC;
resp->usb_audio_spec_revision_valid = 1;
} else {
pr_err("%s: unknown protocol version %x\n", __func__, protocol);
goto err;
}
resp->slot_id = subs->dev->slot_id;
resp->slot_id_valid = 1;
memcpy(&resp->std_as_opr_intf_desc, &alts->desc, sizeof(alts->desc));
resp->std_as_opr_intf_desc_valid = 1;
ep = usb_pipe_endpoint(subs->dev, subs->data_endpoint->pipe);
if (!ep) {
pr_err("%s: data ep # %d context is null\n", __func__,
subs->data_endpoint->ep_num);
goto err;
}
memcpy(&resp->std_as_data_ep_desc, &ep->desc, sizeof(ep->desc));
resp->std_as_data_ep_desc_valid = 1;
xhci_pa = usb_get_xfer_ring_dma_addr(subs->dev, ep);
if (!xhci_pa) {
pr_err("%s:failed to get data ep ring dma address\n", __func__);
goto err;
}
resp->xhci_mem_info.tr_data.pa = xhci_pa;
if (subs->sync_endpoint) {
ep = usb_pipe_endpoint(subs->dev, subs->sync_endpoint->pipe);
if (!ep) {
pr_debug("%s: implicit fb on data ep\n", __func__);
goto skip_sync_ep;
}
memcpy(&resp->std_as_sync_ep_desc, &ep->desc, sizeof(ep->desc));
resp->std_as_sync_ep_desc_valid = 1;
xhci_pa = usb_get_xfer_ring_dma_addr(subs->dev, ep);
if (!xhci_pa) {
pr_err("%s:failed to get sync ep ring dma address\n",
__func__);
goto err;
}
resp->xhci_mem_info.tr_sync.pa = xhci_pa;
}
skip_sync_ep:
resp->interrupter_num = uaudio_qdev->intr_num;
resp->interrupter_num_valid = 1;
/* map xhci data structures PA memory to iova */
/* event ring */
ret = usb_sec_event_ring_setup(subs->dev, resp->interrupter_num);
if (ret) {
pr_err("%s: failed to setup sec event ring ret %d\n", __func__,
ret);
goto err;
}
xhci_pa = usb_get_sec_event_ring_dma_addr(subs->dev,
resp->interrupter_num);
if (!xhci_pa) {
pr_err("%s: failed to get sec event ring dma address\n",
__func__);
goto err;
}
va = uaudio_iommu_map(MEM_EVENT_RING, xhci_pa, PAGE_SIZE);
if (!va)
goto err;
resp->xhci_mem_info.evt_ring.va = PREPEND_SID_TO_IOVA(va,
uaudio_qdev->sid);
resp->xhci_mem_info.evt_ring.pa = xhci_pa;
resp->xhci_mem_info.evt_ring.size = PAGE_SIZE;
uaudio_qdev->er_phys_addr = xhci_pa;
/* dcba */
xhci_pa = usb_get_dcba_dma_addr(subs->dev);
if (!xhci_pa) {
pr_err("%s:failed to get dcba dma address\n", __func__);
goto unmap_er;
}
if (!uadev[card_num].dcba_iova) { /* mappped per usb device */
va = uaudio_iommu_map(MEM_DCBA, xhci_pa, PAGE_SIZE);
if (!va)
goto unmap_er;
uadev[card_num].dcba_iova = va;
uadev[card_num].dcba_size = PAGE_SIZE;
}
dcba_va = uadev[card_num].dcba_iova;
resp->xhci_mem_info.dcba.va = PREPEND_SID_TO_IOVA(dcba_va,
uaudio_qdev->sid);
resp->xhci_mem_info.dcba.pa = xhci_pa;
resp->xhci_mem_info.dcba.size = PAGE_SIZE;
/* data transfer ring */
xhci_pa = resp->xhci_mem_info.tr_data.pa;
va = uaudio_iommu_map(MEM_XFER_RING, xhci_pa, PAGE_SIZE);
if (!va)
goto unmap_dcba;
tr_data_va = va;
resp->xhci_mem_info.tr_data.va = PREPEND_SID_TO_IOVA(va,
uaudio_qdev->sid);
resp->xhci_mem_info.tr_data.size = PAGE_SIZE;
/* sync transfer ring */
if (!resp->xhci_mem_info.tr_sync.pa)
goto skip_sync;
xhci_pa = resp->xhci_mem_info.tr_sync.pa;
va = uaudio_iommu_map(MEM_XFER_RING, xhci_pa, PAGE_SIZE);
if (!va)
goto unmap_data;
tr_sync_va = va;
resp->xhci_mem_info.tr_sync.va = PREPEND_SID_TO_IOVA(va,
uaudio_qdev->sid);
resp->xhci_mem_info.tr_sync.size = PAGE_SIZE;
skip_sync:
/* xfer buffer, multiple of 4K only */
if (!xfer_buf_len)
xfer_buf_len = PAGE_SIZE;
mult = xfer_buf_len / PAGE_SIZE;
remainder = xfer_buf_len % PAGE_SIZE;
len = mult * PAGE_SIZE;
len += remainder ? PAGE_SIZE : 0;
if (len > MAX_XFER_BUFF_LEN) {
pr_err("%s: req buf len %d > max buf len %lu, setting %lu\n",
__func__, len, MAX_XFER_BUFF_LEN, MAX_XFER_BUFF_LEN);
len = MAX_XFER_BUFF_LEN;
}
xfer_buf = usb_alloc_coherent(subs->dev, len, GFP_KERNEL, &xfer_buf_pa);
if (!xfer_buf)
goto unmap_sync;
resp->xhci_mem_info.xfer_buff.pa = xfer_buf_pa;
resp->xhci_mem_info.xfer_buff.size = len;
va = uaudio_iommu_map(MEM_XFER_BUF, xfer_buf_pa, len);
if (!va)
goto unmap_sync;
xfer_buf_va = va;
resp->xhci_mem_info.xfer_buff.va = PREPEND_SID_TO_IOVA(va,
uaudio_qdev->sid);
resp->xhci_mem_info_valid = 1;
if (!atomic_read(&uadev[card_num].in_use)) {
kref_init(&uadev[card_num].kref);
init_waitqueue_head(&uadev[card_num].disconnect_wq);
uadev[card_num].num_intf =
subs->dev->config->desc.bNumInterfaces;
uadev[card_num].info =
kzalloc(sizeof(struct intf_info) *
uadev[card_num].num_intf, GFP_KERNEL);
if (!uadev[card_num].info) {
ret = -ENOMEM;
goto unmap_xfer_buf;
}
uadev[card_num].udev = subs->dev;
atomic_set(&uadev[card_num].in_use, 1);
} else {
kref_get(&uadev[card_num].kref);
}
uadev[card_num].card_num = card_num;
/* cache intf specific info to use it for unmap and free xfer buf */
uadev[card_num].info[info_idx].data_xfer_ring_va = tr_data_va;
uadev[card_num].info[info_idx].data_xfer_ring_size = PAGE_SIZE;
uadev[card_num].info[info_idx].sync_xfer_ring_va = tr_sync_va;
uadev[card_num].info[info_idx].sync_xfer_ring_size = PAGE_SIZE;
uadev[card_num].info[info_idx].xfer_buf_va = xfer_buf_va;
uadev[card_num].info[info_idx].xfer_buf_pa = xfer_buf_pa;
uadev[card_num].info[info_idx].xfer_buf_size = len;
uadev[card_num].info[info_idx].xfer_buf = xfer_buf;
uadev[card_num].info[info_idx].pcm_card_num = card_num;
uadev[card_num].info[info_idx].pcm_dev_num = pcm_dev_num;
uadev[card_num].info[info_idx].direction = subs->direction;
uadev[card_num].info[info_idx].intf_num = subs->interface;
uadev[card_num].info[info_idx].in_use = true;
set_bit(card_num, &uaudio_qdev->card_slot);
return 0;
unmap_xfer_buf:
uaudio_iommu_unmap(MEM_XFER_BUF, xfer_buf_va, len);
unmap_sync:
usb_free_coherent(subs->dev, len, xfer_buf, xfer_buf_pa);
uaudio_iommu_unmap(MEM_XFER_RING, tr_sync_va, PAGE_SIZE);
unmap_data:
uaudio_iommu_unmap(MEM_XFER_RING, tr_data_va, PAGE_SIZE);
unmap_dcba:
uaudio_iommu_unmap(MEM_DCBA, dcba_va, PAGE_SIZE);
unmap_er:
uaudio_iommu_unmap(MEM_EVENT_RING, IOVA_BASE, PAGE_SIZE);
err:
return ret;
}
static void uaudio_dev_intf_cleanup(struct usb_device *udev,
struct intf_info *info)
{
uaudio_iommu_unmap(MEM_XFER_RING, info->data_xfer_ring_va,
info->data_xfer_ring_size);
info->data_xfer_ring_va = 0;
info->data_xfer_ring_size = 0;
uaudio_iommu_unmap(MEM_XFER_RING, info->sync_xfer_ring_va,
info->sync_xfer_ring_size);
info->sync_xfer_ring_va = 0;
info->sync_xfer_ring_size = 0;
uaudio_iommu_unmap(MEM_XFER_BUF, info->xfer_buf_va,
info->xfer_buf_size);
info->xfer_buf_va = 0;
usb_free_coherent(udev, info->xfer_buf_size,
info->xfer_buf, info->xfer_buf_pa);
info->xfer_buf_size = 0;
info->xfer_buf = NULL;
info->xfer_buf_pa = 0;
info->in_use = false;
}
static void uaudio_dev_cleanup(struct uaudio_dev *dev)
{
int if_idx;
/* free xfer buffer and unmap xfer ring and buf per interface */
for (if_idx = 0; if_idx < dev->num_intf; if_idx++) {
if (!dev->info[if_idx].in_use)
continue;
uaudio_dev_intf_cleanup(dev->udev, &dev->info[if_idx]);
pr_debug("%s: release resources: intf# %d card# %d\n", __func__,
dev->info[if_idx].intf_num, dev->card_num);
}
/* iommu_unmap dcba iova for a usb device */
uaudio_iommu_unmap(MEM_DCBA, dev->dcba_iova, dev->dcba_size);
dev->dcba_iova = 0;
dev->dcba_size = 0;
dev->num_intf = 0;
/* free interface info */
kfree(dev->info);
dev->info = NULL;
clear_bit(dev->card_num, &uaudio_qdev->card_slot);
/* all audio devices are disconnected */
if (!uaudio_qdev->card_slot) {
uaudio_iommu_unmap(MEM_EVENT_RING, IOVA_BASE, PAGE_SIZE);
usb_sec_event_ring_cleanup(dev->udev, uaudio_qdev->intr_num);
pr_debug("%s: all audio devices disconnected\n", __func__);
}
dev->udev = NULL;
}
static void uaudio_disconnect_cb(struct snd_usb_audio *chip)
{
int ret;
struct uaudio_dev *dev;
int card_num = chip->card_num;
struct uaudio_qmi_svc *svc = uaudio_svc;
struct qmi_uaudio_stream_ind_msg_v01 disconnect_ind = {0};
pr_debug("%s: for card# %d\n", __func__, card_num);
if (card_num >= SNDRV_CARDS) {
pr_err("%s: invalid card number\n", __func__);
return;
}
mutex_lock(&chip->dev_lock);
dev = &uadev[card_num];
/* clean up */
if (!dev->udev) {
pr_debug("%s: no clean up required\n", __func__);
goto done;
}
if (atomic_read(&dev->in_use)) {
mutex_unlock(&chip->dev_lock);
pr_debug("%s: sending qmi indication disconnect\n", __func__);
disconnect_ind.dev_event = USB_AUDIO_DEV_DISCONNECT_V01;
disconnect_ind.slot_id = dev->udev->slot_id;
ret = qmi_send_ind(svc->uaudio_svc_hdl, svc->curr_conn,
&uaudio_stream_ind_desc, &disconnect_ind,
sizeof(disconnect_ind));
if (ret < 0) {
pr_err("%s: qmi send failed wiht err: %d\n",
__func__, ret);
return;
}
ret = wait_event_interruptible(dev->disconnect_wq,
!atomic_read(&dev->in_use));
if (ret < 0) {
pr_debug("%s: failed with ret %d\n", __func__, ret);
return;
}
mutex_lock(&chip->dev_lock);
}
uaudio_dev_cleanup(dev);
done:
mutex_unlock(&chip->dev_lock);
}
static void uaudio_dev_release(struct kref *kref)
{
struct uaudio_dev *dev = container_of(kref, struct uaudio_dev, kref);
pr_debug("%s for dev %pK\n", __func__, dev);
atomic_set(&dev->in_use, 0);
clear_bit(dev->card_num, &uaudio_qdev->card_slot);
/* all audio devices are disconnected */
if (!uaudio_qdev->card_slot) {
usb_sec_event_ring_cleanup(dev->udev, uaudio_qdev->intr_num);
uaudio_iommu_unmap(MEM_EVENT_RING, IOVA_BASE, PAGE_SIZE);
pr_debug("%s: all audio devices disconnected\n", __func__);
}
wake_up(&dev->disconnect_wq);
}
/* maps audio format received over QMI to asound.h based pcm format */
static int map_pcm_format(unsigned int fmt_received)
{
switch (fmt_received) {
case USB_QMI_PCM_FORMAT_S8:
return SNDRV_PCM_FORMAT_S8;
case USB_QMI_PCM_FORMAT_U8:
return SNDRV_PCM_FORMAT_U8;
case USB_QMI_PCM_FORMAT_S16_LE:
return SNDRV_PCM_FORMAT_S16_LE;
case USB_QMI_PCM_FORMAT_S16_BE:
return SNDRV_PCM_FORMAT_S16_BE;
case USB_QMI_PCM_FORMAT_U16_LE:
return SNDRV_PCM_FORMAT_U16_LE;
case USB_QMI_PCM_FORMAT_U16_BE:
return SNDRV_PCM_FORMAT_U16_BE;
case USB_QMI_PCM_FORMAT_S24_LE:
return SNDRV_PCM_FORMAT_S24_LE;
case USB_QMI_PCM_FORMAT_S24_BE:
return SNDRV_PCM_FORMAT_S24_BE;
case USB_QMI_PCM_FORMAT_U24_LE:
return SNDRV_PCM_FORMAT_U24_LE;
case USB_QMI_PCM_FORMAT_U24_BE:
return SNDRV_PCM_FORMAT_U24_BE;
case USB_QMI_PCM_FORMAT_S24_3LE:
return SNDRV_PCM_FORMAT_S24_3LE;
case USB_QMI_PCM_FORMAT_S24_3BE:
return SNDRV_PCM_FORMAT_S24_3BE;
case USB_QMI_PCM_FORMAT_U24_3LE:
return SNDRV_PCM_FORMAT_U24_3LE;
case USB_QMI_PCM_FORMAT_U24_3BE:
return SNDRV_PCM_FORMAT_U24_3BE;
case USB_QMI_PCM_FORMAT_S32_LE:
return SNDRV_PCM_FORMAT_S32_LE;
case USB_QMI_PCM_FORMAT_S32_BE:
return SNDRV_PCM_FORMAT_S32_BE;
case USB_QMI_PCM_FORMAT_U32_LE:
return SNDRV_PCM_FORMAT_U32_LE;
case USB_QMI_PCM_FORMAT_U32_BE:
return SNDRV_PCM_FORMAT_U32_BE;
default:
return -EINVAL;
}
}
static int info_idx_from_ifnum(int card_num, int intf_num, bool enable)
{
int i;
/*
* default index 0 is used when info is allocated upon
* first enable audio stream req for a pcm device
*/
if (enable && !uadev[card_num].info)
return 0;
for (i = 0; i < uadev[card_num].num_intf; i++) {
if (enable && !uadev[card_num].info[i].in_use)
return i;
else if (!enable &&
uadev[card_num].info[i].intf_num == intf_num)
return i;
}
return -EINVAL;
}
static int handle_uaudio_stream_req(void *req_h, void *req)
{
struct qmi_uaudio_stream_req_msg_v01 *req_msg;
struct qmi_uaudio_stream_resp_msg_v01 resp = {{0}, 0};
struct snd_usb_substream *subs;
struct snd_usb_audio *chip = NULL;
struct uaudio_qmi_svc *svc = uaudio_svc;
struct intf_info *info;
int pcm_format;
u8 pcm_card_num, pcm_dev_num, direction;
int info_idx = -EINVAL, ret = 0;
req_msg = (struct qmi_uaudio_stream_req_msg_v01 *)req;
if (!req_msg->audio_format_valid || !req_msg->bit_rate_valid ||
!req_msg->number_of_ch_valid || !req_msg->xfer_buff_size_valid) {
pr_err("%s: invalid request msg\n", __func__);
ret = -EINVAL;
goto response;
}
direction = req_msg->usb_token & SND_PCM_STREAM_DIRECTION;
pcm_dev_num = (req_msg->usb_token & SND_PCM_DEV_NUM_MASK) >> 8;
pcm_card_num = (req_msg->usb_token & SND_PCM_CARD_NUM_MASK) >> 16;
pr_debug("%s:card#:%d dev#:%d dir:%d en:%d fmt:%d rate:%d #ch:%d\n",
__func__, pcm_card_num, pcm_dev_num, direction, req_msg->enable,
req_msg->audio_format, req_msg->bit_rate,
req_msg->number_of_ch);
if (pcm_card_num >= SNDRV_CARDS) {
pr_err("%s: invalid card # %u", __func__, pcm_card_num);
ret = -EINVAL;
goto response;
}
pcm_format = map_pcm_format(req_msg->audio_format);
if (pcm_format == -EINVAL) {
pr_err("%s: unsupported pcm format received %d\n",
__func__, req_msg->audio_format);
ret = -EINVAL;
goto response;
}
subs = find_snd_usb_substream(pcm_card_num, pcm_dev_num, direction,
&chip, uaudio_disconnect_cb);
if (!subs || !chip || atomic_read(&chip->shutdown)) {
pr_err("%s: can't find substream for card# %u, dev# %u dir%u\n",
__func__, pcm_card_num, pcm_dev_num, direction);
ret = -ENODEV;
goto response;
}
mutex_lock(&chip->dev_lock);
info_idx = info_idx_from_ifnum(pcm_card_num, subs->interface,
req_msg->enable);
if (atomic_read(&chip->shutdown) || !subs->stream || !subs->stream->pcm
|| !subs->stream->chip) {
ret = -ENODEV;
mutex_unlock(&chip->dev_lock);
goto response;
}
if (req_msg->enable) {
if (info_idx < 0) {
pr_err("%s interface# %d already in use card# %d\n",
__func__, subs->interface, pcm_card_num);
ret = -EBUSY;
mutex_unlock(&chip->dev_lock);
goto response;
}
}
subs->pcm_format = pcm_format;
subs->channels = req_msg->number_of_ch;
subs->cur_rate = req_msg->bit_rate;
uadev[pcm_card_num].ctrl_intf = chip->ctrl_intf;
ret = snd_usb_enable_audio_stream(subs, req_msg->enable);
if (!ret && req_msg->enable)
ret = prepare_qmi_response(subs, req_msg, &resp, info_idx);
mutex_unlock(&chip->dev_lock);
response:
if (!req_msg->enable && ret != -EINVAL) {
if (info_idx >= 0) {
mutex_lock(&chip->dev_lock);
info = &uadev[pcm_card_num].info[info_idx];
uaudio_dev_intf_cleanup(uadev[pcm_card_num].udev, info);
pr_debug("%s:release resources: intf# %d card# %d\n",
__func__, subs->interface, pcm_card_num);
mutex_unlock(&chip->dev_lock);
}
if (atomic_read(&uadev[pcm_card_num].in_use))
kref_put(&uadev[pcm_card_num].kref,
uaudio_dev_release);
}
resp.usb_token = req_msg->usb_token;
resp.usb_token_valid = 1;
resp.internal_status = ret;
resp.internal_status_valid = 1;
resp.status = ret ? USB_AUDIO_STREAM_REQ_FAILURE_V01 : ret;
resp.status_valid = 1;
ret = qmi_send_resp_from_cb(svc->uaudio_svc_hdl, svc->curr_conn, req_h,
&uaudio_stream_resp_desc, &resp, sizeof(resp));
svc->t_resp_sent = ktime_get();
pr_debug("%s: t_resp sent - t_req recvd (in ms) %lld\n", __func__,
ktime_to_ms(ktime_sub(svc->t_resp_sent, svc->t_request_recvd)));
return ret;
}
static int uaudio_qmi_svc_connect_cb(struct qmi_handle *handle,
void *conn_h)
{
struct uaudio_qmi_svc *svc = uaudio_svc;
if (svc->uaudio_svc_hdl != handle || !conn_h) {
pr_err("%s: handle mismatch\n", __func__);
return -EINVAL;
}
if (svc->curr_conn) {
pr_err("%s: Service is busy\n", __func__);
return -ECONNREFUSED;
}
svc->curr_conn = conn_h;
return 0;
}
static void uaudio_qmi_disconnect_work(struct work_struct *w)
{
struct intf_info *info;
int idx, if_idx;
struct snd_usb_substream *subs;
struct snd_usb_audio *chip = NULL;
/* find all active intf for set alt 0 and cleanup usb audio dev */
for (idx = 0; idx < SNDRV_CARDS; idx++) {
if (!atomic_read(&uadev[idx].in_use))
continue;
for (if_idx = 0; if_idx < uadev[idx].num_intf; if_idx++) {
if (!uadev[idx].info || !uadev[idx].info[if_idx].in_use)
continue;
info = &uadev[idx].info[if_idx];
subs = find_snd_usb_substream(info->pcm_card_num,
info->pcm_dev_num,
info->direction,
&chip,
uaudio_disconnect_cb);
if (!subs || !chip || atomic_read(&chip->shutdown)) {
pr_debug("%s:no subs for c#%u, dev#%u dir%u\n",
__func__, info->pcm_card_num,
info->pcm_dev_num,
info->direction);
continue;
}
snd_usb_enable_audio_stream(subs, 0);
}
atomic_set(&uadev[idx].in_use, 0);
mutex_lock(&chip->dev_lock);
uaudio_dev_cleanup(&uadev[idx]);
mutex_unlock(&chip->dev_lock);
}
}
static int uaudio_qmi_svc_disconnect_cb(struct qmi_handle *handle,
void *conn_h)
{
struct uaudio_qmi_svc *svc = uaudio_svc;
if (svc->uaudio_svc_hdl != handle || svc->curr_conn != conn_h) {
pr_err("%s: handle mismatch\n", __func__);
return -EINVAL;
}
svc->curr_conn = NULL;
queue_work(svc->uaudio_wq, &svc->qmi_disconnect_work);
return 0;
}
static int uaudio_qmi_svc_req_cb(struct qmi_handle *handle, void *conn_h,
void *req_h, unsigned int msg_id, void *req)
{
int ret;
struct uaudio_qmi_svc *svc = uaudio_svc;
if (svc->uaudio_svc_hdl != handle || svc->curr_conn != conn_h) {
pr_err("%s: handle mismatch\n", __func__);
return -EINVAL;
}
switch (msg_id) {
case QMI_UAUDIO_STREAM_REQ_V01:
ret = handle_uaudio_stream_req(req_h, req);
break;
default:
ret = -ENOTSUPP;
break;
}
return ret;
}
static int uaudio_qmi_svc_req_desc_cb(unsigned int msg_id,
struct msg_desc **req_desc)
{
int ret;
pr_debug("%s: msg_id %d\n", __func__, msg_id);
switch (msg_id) {
case QMI_UAUDIO_STREAM_REQ_V01:
*req_desc = &uaudio_stream_req_desc;
ret = sizeof(struct qmi_uaudio_stream_req_msg_v01);
break;
default:
ret = -ENOTSUPP;
break;
}
return ret;
}
static void uaudio_qmi_svc_recv_msg(struct work_struct *w)
{
int ret;
struct uaudio_qmi_svc *svc = container_of(w, struct uaudio_qmi_svc,
recv_msg_work);
do {
pr_debug("%s: Notified about a Receive Event", __func__);
} while ((ret = qmi_recv_msg(svc->uaudio_svc_hdl)) == 0);
if (ret != -ENOMSG)
pr_err("%s: Error receiving message\n", __func__);
}
static void uaudio_qmi_svc_ntfy(struct qmi_handle *handle,
enum qmi_event_type event, void *priv)
{
struct uaudio_qmi_svc *svc = uaudio_svc;
pr_debug("%s: event %d", __func__, event);
svc->t_request_recvd = ktime_get();
switch (event) {
case QMI_RECV_MSG:
queue_work(svc->uaudio_wq, &svc->recv_msg_work);
break;
default:
break;
}
}
static struct qmi_svc_ops_options uaudio_svc_ops_options = {
.version = 1,
.service_id = UAUDIO_STREAM_SERVICE_ID_V01,
.service_vers = UAUDIO_STREAM_SERVICE_VERS_V01,
.connect_cb = uaudio_qmi_svc_connect_cb,
.disconnect_cb = uaudio_qmi_svc_disconnect_cb,
.req_desc_cb = uaudio_qmi_svc_req_desc_cb,
.req_cb = uaudio_qmi_svc_req_cb,
};
static int uaudio_qmi_plat_probe(struct platform_device *pdev)
{
int ret;
struct device_node *node = pdev->dev.of_node;
uaudio_qdev = devm_kzalloc(&pdev->dev, sizeof(struct uaudio_qmi_dev),
GFP_KERNEL);
if (!uaudio_qdev)
return -ENOMEM;
uaudio_qdev->dev = &pdev->dev;
ret = of_property_read_u32(node, "qcom,usb-audio-stream-id",
&uaudio_qdev->sid);
if (ret) {
dev_err(&pdev->dev, "failed to read sid.\n");
return -ENODEV;
}
ret = of_property_read_u32(node, "qcom,usb-audio-intr-num",
&uaudio_qdev->intr_num);
if (ret) {
dev_err(&pdev->dev, "failed to read intr num.\n");
return -ENODEV;
}
uaudio_qdev->domain = iommu_domain_alloc(pdev->dev.bus);
if (!uaudio_qdev->domain) {
dev_err(&pdev->dev, "failed to allocate iommu domain\n");
return -ENODEV;
}
/* attach to external processor iommu */
ret = iommu_attach_device(uaudio_qdev->domain, &pdev->dev);
if (ret) {
dev_err(&pdev->dev, "failed to attach device ret = %d\n", ret);
goto free_domain;
}
/* initialize dcba, xfer ring and xfer buf iova list */
INIT_LIST_HEAD(&uaudio_qdev->dcba_list);
uaudio_qdev->curr_dcba_iova = IOVA_DCBA_BASE;
uaudio_qdev->dcba_iova_size = SNDRV_CARDS * PAGE_SIZE;
INIT_LIST_HEAD(&uaudio_qdev->xfer_ring_list);
uaudio_qdev->curr_xfer_ring_iova = IOVA_XFER_RING_BASE;
uaudio_qdev->xfer_ring_iova_size =
IOVA_XFER_RING_MAX - IOVA_XFER_RING_BASE;
INIT_LIST_HEAD(&uaudio_qdev->xfer_buf_list);
uaudio_qdev->curr_xfer_buf_iova = IOVA_XFER_BUF_BASE;
uaudio_qdev->xfer_buf_iova_size =
IOVA_XFER_BUF_MAX - IOVA_XFER_BUF_BASE;
return 0;
free_domain:
iommu_domain_free(uaudio_qdev->domain);
return ret;
}
static int uaudio_qmi_plat_remove(struct platform_device *pdev)
{
iommu_detach_device(uaudio_qdev->domain, &pdev->dev);
iommu_domain_free(uaudio_qdev->domain);
uaudio_qdev->domain = NULL;
return 0;
}
static const struct of_device_id of_uaudio_matach[] = {
{
.compatible = "qcom,usb-audio-qmi-dev",
},
{ },
};
MODULE_DEVICE_TABLE(of, of_uaudio_matach);
static struct platform_driver uaudio_qmi_driver = {
.probe = uaudio_qmi_plat_probe,
.remove = uaudio_qmi_plat_remove,
.driver = {
.name = "uaudio-qmi",
.of_match_table = of_uaudio_matach,
},
};
static int uaudio_qmi_svc_init(void)
{
int ret;
struct uaudio_qmi_svc *svc;
svc = kzalloc(sizeof(struct uaudio_qmi_svc), GFP_KERNEL);
if (!svc)
return -ENOMEM;
svc->uaudio_wq = create_singlethread_workqueue("uaudio_svc");
if (!svc->uaudio_wq) {
ret = -ENOMEM;
goto free_svc;
}
svc->uaudio_svc_hdl = qmi_handle_create(uaudio_qmi_svc_ntfy, NULL);
if (!svc->uaudio_svc_hdl) {
pr_err("%s: Error creating svc_hdl\n", __func__);
ret = -EFAULT;
goto destroy_uaudio_wq;
}
ret = qmi_svc_register(svc->uaudio_svc_hdl, &uaudio_svc_ops_options);
if (ret < 0) {
pr_err("%s:Error registering uaudio svc %d\n", __func__, ret);
goto destroy_svc_handle;
}
INIT_WORK(&svc->recv_msg_work, uaudio_qmi_svc_recv_msg);
INIT_WORK(&svc->qmi_disconnect_work, uaudio_qmi_disconnect_work);
uaudio_svc = svc;
return 0;
destroy_svc_handle:
qmi_handle_destroy(svc->uaudio_svc_hdl);
destroy_uaudio_wq:
destroy_workqueue(svc->uaudio_wq);
free_svc:
kfree(svc);
return ret;
}
static void uaudio_qmi_svc_exit(void)
{
struct uaudio_qmi_svc *svc = uaudio_svc;
qmi_svc_unregister(svc->uaudio_svc_hdl);
flush_workqueue(svc->uaudio_wq);
qmi_handle_destroy(svc->uaudio_svc_hdl);
destroy_workqueue(svc->uaudio_wq);
kfree(svc);
uaudio_svc = NULL;
}
static int __init uaudio_qmi_plat_init(void)
{
int ret;
ret = platform_driver_register(&uaudio_qmi_driver);
if (ret)
return ret;
return uaudio_qmi_svc_init();
}
static void __exit uaudio_qmi_plat_exit(void)
{
uaudio_qmi_svc_exit();
platform_driver_unregister(&uaudio_qmi_driver);
}
module_init(uaudio_qmi_plat_init);
module_exit(uaudio_qmi_plat_exit);
MODULE_DESCRIPTION("USB AUDIO QMI Service Driver");
MODULE_LICENSE("GPL v2");