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usb: gadget: Add snapshot of USB QDSS function driver

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This change adds USB QDSS function driver which allows communication
between USB BAM and QDSS BAM for QDSS debug functionality over USB.
This snapshot is taken as of msm-4.19 kernel commit <b318a6e04625>
("Merge "msm: ipa4: Fix to use common PM handle for coalescing and
default pipe"").

Change-Id: I07919f9453552bec5e420afad32a1bc65c761fd7
Signed-off-by: Mayank Rana <mrana@codeaurora.org>
This commit is contained in:
Mayank Rana
2019-10-21 16:01:51 -07:00
committed by Gerrit - the friendly Code Review server
parent cc4575e377
commit 9dff3d36df
6 changed files with 1549 additions and 0 deletions
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94
include/linux/usb/usb_qdss.h Normal file
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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (c) 2012-2013, 2017-2019 The Linux Foundation. All rights reserved.
*/
#ifndef __LINUX_USB_QDSS_H
#define __LINUX_USB_QDSS_H
#include <linux/kernel.h>
#define USB_QDSS_CH_MDM "qdss_mdm"
#define USB_QDSS_CH_MSM "qdss"
struct qdss_request {
char *buf;
int length;
int actual;
int status;
void *context;
struct scatterlist *sg;
unsigned int num_sgs;
unsigned int num_mapped_sgs;
};
struct usb_qdss_ch {
const char *name;
struct list_head list;
void (*notify)(void *priv, unsigned int event,
struct qdss_request *d_req, struct usb_qdss_ch *ch);
void *priv;
void *priv_usb;
int app_conn;
};
enum qdss_state {
USB_QDSS_CONNECT,
USB_QDSS_DISCONNECT,
USB_QDSS_CTRL_READ_DONE,
USB_QDSS_DATA_WRITE_DONE,
USB_QDSS_CTRL_WRITE_DONE,
};
#if IS_ENABLED(CONFIG_USB_F_QDSS)
struct usb_qdss_ch *usb_qdss_open(const char *name, void *priv,
void (*notify)(void *priv, unsigned int event,
struct qdss_request *d_req, struct usb_qdss_ch *ch));
void usb_qdss_close(struct usb_qdss_ch *ch);
int usb_qdss_alloc_req(struct usb_qdss_ch *ch, int n_write, int n_read);
void usb_qdss_free_req(struct usb_qdss_ch *ch);
int usb_qdss_read(struct usb_qdss_ch *ch, struct qdss_request *d_req);
int usb_qdss_write(struct usb_qdss_ch *ch, struct qdss_request *d_req);
int usb_qdss_ctrl_write(struct usb_qdss_ch *ch, struct qdss_request *d_req);
int usb_qdss_ctrl_read(struct usb_qdss_ch *ch, struct qdss_request *d_req);
#else
static inline struct usb_qdss_ch *usb_qdss_open(const char *name, void *priv,
void (*n)(void *, unsigned int event,
struct qdss_request *d, struct usb_qdss_ch *c))
{
return ERR_PTR(-ENODEV);
}
static inline int usb_qdss_read(struct usb_qdss_ch *c, struct qdss_request *d)
{
return -ENODEV;
}
static inline int usb_qdss_write(struct usb_qdss_ch *c, struct qdss_request *d)
{
return -ENODEV;
}
static inline int usb_qdss_ctrl_write(struct usb_qdss_ch *c,
struct qdss_request *d)
{
return -ENODEV;
}
static inline int usb_qdss_ctrl_read(struct usb_qdss_ch *c,
struct qdss_request *d)
{
return -ENODEV;
}
static inline int usb_qdss_alloc_req(struct usb_qdss_ch *c, int n_wr, int n_rd)
{
return -ENODEV;
}
static inline void usb_qdss_close(struct usb_qdss_ch *ch) { }
static inline void usb_qdss_free_req(struct usb_qdss_ch *ch) { }
#endif /* CONFIG_USB_F_QDSS */
#endif