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android_kernel_samsung_msm8976/drivers/usb/gadget/f_qc_rndis.c

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/*
* f_qc_rndis.c -- RNDIS link function driver
*
* Copyright (C) 2003-2005,2008 David Brownell
* Copyright (C) 2003-2004 Robert Schwebel, Benedikt Spranger
* Copyright (C) 2008 Nokia Corporation
* Copyright (C) 2009 Samsung Electronics
* Author: Michal Nazarewicz (mina86@mina86.com)
* Copyright (c) 2012-2017, 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
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* #define VERBOSE_DEBUG */
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/etherdevice.h>
#include <linux/atomic.h>
#include "u_ether.h"
#include "u_qc_ether.h"
#include "rndis.h"
#include "u_bam_data.h"
#include <linux/rndis_ipa.h>
unsigned int rndis_dl_max_xfer_size = 9216;
module_param(rndis_dl_max_xfer_size, uint, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(rndis_dl_max_xfer_size,
"Max size of bus transfer to host");
/*
* This function is an RNDIS Ethernet port -- a Microsoft protocol that's
* been promoted instead of the standard CDC Ethernet. The published RNDIS
* spec is ambiguous, incomplete, and needlessly complex. Variants such as
* ActiveSync have even worse status in terms of specification.
*
* In short: it's a protocol controlled by (and for) Microsoft, not for an
* Open ecosystem or markets. Linux supports it *only* because Microsoft
* doesn't support the CDC Ethernet standard.
*
* The RNDIS data transfer model is complex, with multiple Ethernet packets
* per USB message, and out of band data. The control model is built around
* what's essentially an "RNDIS RPC" protocol. It's all wrapped in a CDC ACM
* (modem, not Ethernet) veneer, with those ACM descriptors being entirely
* useless (they're ignored). RNDIS expects to be the only function in its
* configuration, so it's no real help if you need composite devices; and
* it expects to be the first configuration too.
*
* There is a single technical advantage of RNDIS over CDC Ethernet, if you
* discount the fluff that its RPC can be made to deliver: it doesn't need
* a NOP altsetting for the data interface. That lets it work on some of the
* "so smart it's stupid" hardware which takes over configuration changes
* from the software, and adds restrictions like "no altsettings".
*
* Unfortunately MSFT's RNDIS drivers are buggy. They hang or oops, and
* have all sorts of contrary-to-specification oddities that can prevent
* them from working sanely. Since bugfixes (or accurate specs, letting
* Linux work around those bugs) are unlikely to ever come from MSFT, you
* may want to avoid using RNDIS on purely operational grounds.
*
* Omissions from the RNDIS 1.0 specification include:
*
* - Power management ... references data that's scattered around lots
* of other documentation, which is incorrect/incomplete there too.
*
* - There are various undocumented protocol requirements, like the need
* to send garbage in some control-OUT messages.
*
* - MS-Windows drivers sometimes emit undocumented requests.
*
* This function is based on RNDIS link function driver and
* contains MSM specific implementation.
*/
struct f_rndis_qc {
struct qc_gether port;
u8 ctrl_id, data_id;
u8 ethaddr[ETH_ALEN];
u32 vendorID;
u8 ul_max_pkt_per_xfer;
u8 pkt_alignment_factor;
u32 max_pkt_size;
const char *manufacturer;
int config;
atomic_t ioctl_excl;
atomic_t open_excl;
struct usb_ep *notify;
struct usb_request *notify_req;
atomic_t notify_count;
struct data_port bam_port;
enum transport_type xport;
u8 port_num;
bool net_ready_trigger;
};
static struct ipa_usb_init_params rndis_ipa_params;
static spinlock_t rndis_lock;
static bool rndis_ipa_supported;
static void rndis_qc_open(struct qc_gether *geth);
static inline struct f_rndis_qc *func_to_rndis_qc(struct usb_function *f)
{
return container_of(f, struct f_rndis_qc, port.func);
}
/* peak (theoretical) bulk transfer rate in bits-per-second */
static unsigned int rndis_qc_bitrate(struct usb_gadget *g)
{
if (gadget_is_superspeed(g) && g->speed == USB_SPEED_SUPER)
return 13 * 1024 * 8 * 1000 * 8;
else if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH)
return 13 * 512 * 8 * 1000 * 8;
else
return 19 * 64 * 1 * 1000 * 8;
}
/*-------------------------------------------------------------------------*/
#define RNDIS_QC_LOG2_STATUS_INTERVAL_MSEC 5 /* 1 << 5 == 32 msec */
#define RNDIS_QC_STATUS_BYTECOUNT 8 /* 8 bytes data */
/* currently only one rndis instance is supported - port
* index 0.
*/
#define RNDIS_QC_NO_PORTS 1
#define RNDIS_QC_ACTIVE_PORT 0
/* default max packets per tarnsfer value */
#define DEFAULT_MAX_PKT_PER_XFER 15
/* default pkt alignment factor */
#define DEFAULT_PKT_ALIGNMENT_FACTOR 4
#define RNDIS_QC_IOCTL_MAGIC 'i'
#define RNDIS_QC_GET_MAX_PKT_PER_XFER _IOR(RNDIS_QC_IOCTL_MAGIC, 1, u8)
#define RNDIS_QC_GET_MAX_PKT_SIZE _IOR(RNDIS_QC_IOCTL_MAGIC, 2, u32)
/* interface descriptor: */
static struct usb_interface_descriptor rndis_qc_control_intf = {
.bLength = sizeof rndis_qc_control_intf,
.bDescriptorType = USB_DT_INTERFACE,
/* .bInterfaceNumber = DYNAMIC */
/* status endpoint is optional; this could be patched later */
.bNumEndpoints = 1,
.bInterfaceClass = USB_CLASS_COMM,
.bInterfaceSubClass = USB_CDC_SUBCLASS_ACM,
.bInterfaceProtocol = USB_CDC_ACM_PROTO_VENDOR,
/* .iInterface = DYNAMIC */
};
static struct usb_cdc_header_desc rndis_qc_header_desc = {
.bLength = sizeof rndis_qc_header_desc,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = USB_CDC_HEADER_TYPE,
.bcdCDC = cpu_to_le16(0x0110),
};
static struct usb_cdc_call_mgmt_descriptor rndis_qc_call_mgmt_descriptor = {
.bLength = sizeof rndis_qc_call_mgmt_descriptor,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = USB_CDC_CALL_MANAGEMENT_TYPE,
.bmCapabilities = 0x00,
.bDataInterface = 0x01,
};
static struct usb_cdc_acm_descriptor rndis_qc_acm_descriptor = {
.bLength = sizeof rndis_qc_acm_descriptor,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = USB_CDC_ACM_TYPE,
.bmCapabilities = 0x00,
};
#if defined(CONFIG_USB_RNDIS_VZW_REQ)
/* In VZW Models size of MTU is fixed using Devguru AVD Descriptor */
struct usb_qc_rndis_mtu_avd_descriptor {
__u8 bLength;
__u8 bDescriptorType;
__u8 bDescriptorSubType;
__u16 bDAU1_Type;
__u16 bDAU1_Length;
__u32 bDAU1_Value;
__u16 bDAU2_Type;
__u16 bDAU2_Length;
__u8 bDAU2_Value;
} __attribute__ ((packed));
static struct usb_qc_rndis_mtu_avd_descriptor rndis_qc_avd_descriptor = {
.bLength = 0x10,
.bDescriptorType = 0x24,
.bDescriptorSubType = 0x80,
/* First DAU = MTU Size */
.bDAU1_Type = 0x000A,
.bDAU1_Length = 0x0004,
.bDAU1_Value = 0x00000594, /* 1428Byte */
/* Second DAU = Rndis version */
.bDAU2_Type = 0x000B,
.bDAU2_Length = 0x0001,
.bDAU2_Value = 0x01, /* Rndis5.1 */
};
#endif
static struct usb_cdc_union_desc rndis_qc_union_desc = {
.bLength = sizeof(rndis_qc_union_desc),
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = USB_CDC_UNION_TYPE,
/* .bMasterInterface0 = DYNAMIC */
/* .bSlaveInterface0 = DYNAMIC */
};
/* the data interface has two bulk endpoints */
static struct usb_interface_descriptor rndis_qc_data_intf = {
.bLength = sizeof rndis_qc_data_intf,
.bDescriptorType = USB_DT_INTERFACE,
/* .bInterfaceNumber = DYNAMIC */
.bNumEndpoints = 2,
.bInterfaceClass = USB_CLASS_CDC_DATA,
.bInterfaceSubClass = 0,
.bInterfaceProtocol = 0,
/* .iInterface = DYNAMIC */
};
static struct usb_interface_assoc_descriptor
rndis_qc_iad_descriptor = {
.bLength = sizeof rndis_qc_iad_descriptor,
.bDescriptorType = USB_DT_INTERFACE_ASSOCIATION,
.bFirstInterface = 0, /* XXX, hardcoded */
.bInterfaceCount = 2, /* control + data */
.bFunctionClass = USB_CLASS_COMM,
.bFunctionSubClass = USB_CDC_SUBCLASS_ETHERNET,
.bFunctionProtocol = USB_CDC_PROTO_NONE,
/* .iFunction = DYNAMIC */
};
/* full speed support: */
static struct usb_endpoint_descriptor rndis_qc_fs_notify_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_INT,
.wMaxPacketSize = cpu_to_le16(RNDIS_QC_STATUS_BYTECOUNT),
.bInterval = 1 << RNDIS_QC_LOG2_STATUS_INTERVAL_MSEC,
};
static struct usb_endpoint_descriptor rndis_qc_fs_in_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
};
static struct usb_endpoint_descriptor rndis_qc_fs_out_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_OUT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
};
static struct usb_descriptor_header *eth_qc_fs_function[] = {
(struct usb_descriptor_header *) &rndis_qc_iad_descriptor,
/* control interface matches ACM, not Ethernet */
(struct usb_descriptor_header *) &rndis_qc_control_intf,
(struct usb_descriptor_header *) &rndis_qc_header_desc,
(struct usb_descriptor_header *) &rndis_qc_call_mgmt_descriptor,
(struct usb_descriptor_header *) &rndis_qc_acm_descriptor,
(struct usb_descriptor_header *) &rndis_qc_union_desc,
(struct usb_descriptor_header *) &rndis_qc_fs_notify_desc,
/* data interface has no altsetting */
(struct usb_descriptor_header *) &rndis_qc_data_intf,
(struct usb_descriptor_header *) &rndis_qc_fs_in_desc,
(struct usb_descriptor_header *) &rndis_qc_fs_out_desc,
#if defined(CONFIG_USB_RNDIS_VZW_REQ)
(struct usb_descriptor_header *) &rndis_qc_avd_descriptor,
#endif
NULL,
};
/* high speed support: */
static struct usb_endpoint_descriptor rndis_qc_hs_notify_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_INT,
.wMaxPacketSize = cpu_to_le16(RNDIS_QC_STATUS_BYTECOUNT),
.bInterval = RNDIS_QC_LOG2_STATUS_INTERVAL_MSEC + 4,
};
static struct usb_endpoint_descriptor rndis_qc_hs_in_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = cpu_to_le16(512),
};
static struct usb_endpoint_descriptor rndis_qc_hs_out_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_OUT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = cpu_to_le16(512),
};
static struct usb_descriptor_header *eth_qc_hs_function[] = {
(struct usb_descriptor_header *) &rndis_qc_iad_descriptor,
/* control interface matches ACM, not Ethernet */
(struct usb_descriptor_header *) &rndis_qc_control_intf,
(struct usb_descriptor_header *) &rndis_qc_header_desc,
(struct usb_descriptor_header *) &rndis_qc_call_mgmt_descriptor,
(struct usb_descriptor_header *) &rndis_qc_acm_descriptor,
(struct usb_descriptor_header *) &rndis_qc_union_desc,
(struct usb_descriptor_header *) &rndis_qc_hs_notify_desc,
/* data interface has no altsetting */
(struct usb_descriptor_header *) &rndis_qc_data_intf,
(struct usb_descriptor_header *) &rndis_qc_hs_in_desc,
(struct usb_descriptor_header *) &rndis_qc_hs_out_desc,
#if defined(CONFIG_USB_RNDIS_VZW_REQ)
(struct usb_descriptor_header *) &rndis_qc_avd_descriptor,
#endif
NULL,
};
/* super speed support: */
static struct usb_endpoint_descriptor rndis_qc_ss_notify_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_INT,
.wMaxPacketSize = cpu_to_le16(STATUS_BYTECOUNT),
.bInterval = LOG2_STATUS_INTERVAL_MSEC + 4,
};
static struct usb_ss_ep_comp_descriptor rndis_qc_ss_intr_comp_desc = {
.bLength = sizeof ss_intr_comp_desc,
.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
/* the following 3 values can be tweaked if necessary */
/* .bMaxBurst = 0, */
/* .bmAttributes = 0, */
.wBytesPerInterval = cpu_to_le16(STATUS_BYTECOUNT),
};
static struct usb_endpoint_descriptor rndis_qc_ss_in_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = cpu_to_le16(1024),
};
static struct usb_endpoint_descriptor rndis_qc_ss_out_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_OUT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = cpu_to_le16(1024),
};
static struct usb_ss_ep_comp_descriptor rndis_qc_ss_bulk_comp_desc = {
.bLength = sizeof ss_bulk_comp_desc,
.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
/* the following 2 values can be tweaked if necessary */
/* .bMaxBurst = 0, */
/* .bmAttributes = 0, */
};
static struct usb_descriptor_header *eth_qc_ss_function[] = {
(struct usb_descriptor_header *) &rndis_qc_iad_descriptor,
/* control interface matches ACM, not Ethernet */
(struct usb_descriptor_header *) &rndis_qc_control_intf,
(struct usb_descriptor_header *) &rndis_qc_header_desc,
(struct usb_descriptor_header *) &rndis_qc_call_mgmt_descriptor,
(struct usb_descriptor_header *) &rndis_qc_acm_descriptor,
(struct usb_descriptor_header *) &rndis_qc_union_desc,
(struct usb_descriptor_header *) &rndis_qc_ss_notify_desc,
(struct usb_descriptor_header *) &rndis_qc_ss_intr_comp_desc,
/* data interface has no altsetting */
(struct usb_descriptor_header *) &rndis_qc_data_intf,
(struct usb_descriptor_header *) &rndis_qc_ss_in_desc,
(struct usb_descriptor_header *) &rndis_qc_ss_bulk_comp_desc,
(struct usb_descriptor_header *) &rndis_qc_ss_out_desc,
(struct usb_descriptor_header *) &rndis_qc_ss_bulk_comp_desc,
#if defined(CONFIG_USB_RNDIS_VZW_REQ)
(struct usb_descriptor_header *) &rndis_qc_avd_descriptor,
#endif
NULL,
};
/* string descriptors: */
static struct usb_string rndis_qc_string_defs[] = {
[0].s = "RNDIS Communications Control",
[1].s = "RNDIS Ethernet Data",
[2].s = "RNDIS",
{ } /* end of list */
};
static struct usb_gadget_strings rndis_qc_string_table = {
.language = 0x0409, /* en-us */
.strings = rndis_qc_string_defs,
};
static struct usb_gadget_strings *rndis_qc_strings[] = {
&rndis_qc_string_table,
NULL,
};
struct f_rndis_qc *_rndis_qc;
static inline int rndis_qc_lock(atomic_t *excl)
{
if (atomic_inc_return(excl) == 1) {
return 0;
} else {
atomic_dec(excl);
return -EBUSY;
}
}
static inline void rndis_qc_unlock(atomic_t *excl)
{
atomic_dec(excl);
}
/*-------------------------------------------------------------------------*/
static struct sk_buff *rndis_qc_add_header(struct qc_gether *port,
struct sk_buff *skb)
{
struct sk_buff *skb2;
skb2 = skb_realloc_headroom(skb, sizeof(struct rndis_packet_msg_type));
if (skb2)
rndis_add_hdr(skb2);
dev_kfree_skb_any(skb);
return skb2;
}
int rndis_qc_rm_hdr(struct qc_gether *port,
struct sk_buff *skb,
struct sk_buff_head *list)
{
/* tmp points to a struct rndis_packet_msg_type */
__le32 *tmp = (void *)skb->data;
/* MessageType, MessageLength */
if (cpu_to_le32(RNDIS_MSG_PACKET)
!= get_unaligned(tmp++)) {
dev_kfree_skb_any(skb);
return -EINVAL;
}
tmp++;
/* DataOffset, DataLength */
if (!skb_pull(skb, get_unaligned_le32(tmp++) + 8)) {
dev_kfree_skb_any(skb);
return -EOVERFLOW;
}
skb_trim(skb, get_unaligned_le32(tmp++));
skb_queue_tail(list, skb);
return 0;
}
static void rndis_qc_response_available(void *_rndis)
{
struct f_rndis_qc *rndis = _rndis;
struct usb_request *req = rndis->notify_req;
__le32 *data = req->buf;
int status;
if (atomic_inc_return(&rndis->notify_count) != 1)
return;
/* Send RNDIS RESPONSE_AVAILABLE notification; a
* USB_CDC_NOTIFY_RESPONSE_AVAILABLE "should" work too
*
* This is the only notification defined by RNDIS.
*/
data[0] = cpu_to_le32(1);
data[1] = cpu_to_le32(0);
status = usb_ep_queue(rndis->notify, req, GFP_ATOMIC);
if (status) {
atomic_dec(&rndis->notify_count);
pr_info("notify/0 --> %d\n", status);
}
}
static void rndis_qc_response_complete(struct usb_ep *ep,
struct usb_request *req)
{
struct f_rndis_qc *rndis = req->context;
int status = req->status;
struct usb_composite_dev *cdev;
if (!rndis->port.func.config || !rndis->port.func.config->cdev) {
pr_err("%s(): cdev or config is NULL.\n", __func__);
return;
} else {
cdev = rndis->port.func.config->cdev;
}
/* after TX:
* - USB_CDC_GET_ENCAPSULATED_RESPONSE (ep0/control)
* - RNDIS_RESPONSE_AVAILABLE (status/irq)
*/
switch (status) {
case -ECONNRESET:
case -ESHUTDOWN:
/* connection gone */
atomic_set(&rndis->notify_count, 0);
break;
default:
pr_info("RNDIS %s response error %d, %d/%d\n",
ep->name, status,
req->actual, req->length);
/* FALLTHROUGH */
case 0:
if (ep != rndis->notify)
break;
/* handle multiple pending RNDIS_RESPONSE_AVAILABLE
* notifications by resending until we're done
*/
if (atomic_dec_and_test(&rndis->notify_count))
break;
status = usb_ep_queue(rndis->notify, req, GFP_ATOMIC);
if (status) {
atomic_dec(&rndis->notify_count);
DBG(cdev, "notify/1 --> %d\n", status);
}
break;
}
}
static void rndis_qc_command_complete(struct usb_ep *ep,
struct usb_request *req)
{
struct f_rndis_qc *rndis = req->context;
int status;
rndis_init_msg_type *buf;
u32 ul_max_xfer_size, dl_max_xfer_size;
/* received RNDIS command from USB_CDC_SEND_ENCAPSULATED_COMMAND */
status = rndis_msg_parser(rndis->config, (u8 *) req->buf);
if (status < 0)
pr_err("RNDIS command error %d, %d/%d\n",
status, req->actual, req->length);
buf = (rndis_init_msg_type *)req->buf;
if (buf->MessageType == RNDIS_MSG_INIT) {
ul_max_xfer_size = rndis_get_ul_max_xfer_size(rndis->config);
u_bam_data_set_ul_max_xfer_size(ul_max_xfer_size);
/*
* For consistent data throughput from IPA, it is required to
* fine tune aggregation byte limit as 7KB. RNDIS IPA driver
* use provided this value to calculate aggregation byte limit
* and program IPA hardware for aggregation.
* Host provides 8KB or 16KB as Max Transfer size, hence select
* minimum out of host provided value and optimum transfer size
* to get 7KB as aggregation byte limit.
*/
if (rndis_dl_max_xfer_size)
dl_max_xfer_size = min_t(u32, rndis_dl_max_xfer_size,
rndis_get_dl_max_xfer_size(rndis->config));
else
dl_max_xfer_size =
rndis_get_dl_max_xfer_size(rndis->config);
u_bam_data_set_dl_max_xfer_size(dl_max_xfer_size);
}
}
static int
rndis_qc_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
{
struct f_rndis_qc *rndis = func_to_rndis_qc(f);
struct usb_composite_dev *cdev = f->config->cdev;
struct usb_request *req = cdev->req;
int value = -EOPNOTSUPP;
u16 w_index = le16_to_cpu(ctrl->wIndex);
u16 w_value = le16_to_cpu(ctrl->wValue);
u16 w_length = le16_to_cpu(ctrl->wLength);
/* composite driver infrastructure handles everything except
* CDC class messages; interface activation uses set_alt().
*/
pr_debug("%s: Enter\n", __func__);
switch ((ctrl->bRequestType << 8) | ctrl->bRequest) {
/* RNDIS uses the CDC command encapsulation mechanism to implement
* an RPC scheme, with much getting/setting of attributes by OID.
*/
case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
| USB_CDC_SEND_ENCAPSULATED_COMMAND:
if (w_value || w_index != rndis->ctrl_id)
goto invalid;
/* read the request; process it later */
value = w_length;
req->complete = rndis_qc_command_complete;
/* later, rndis_response_available() sends a notification */
break;
case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
| USB_CDC_GET_ENCAPSULATED_RESPONSE:
if (w_value || w_index != rndis->ctrl_id)
goto invalid;
else {
u8 *buf;
u32 n;
/* return the result */
buf = rndis_get_next_response(rndis->config, &n);
if (buf) {
memcpy(req->buf, buf, n);
req->complete = rndis_qc_response_complete;
rndis_free_response(rndis->config, buf);
value = n;
}
/* else stalls ... spec says to avoid that */
}
break;
default:
invalid:
VDBG(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
ctrl->bRequestType, ctrl->bRequest,
w_value, w_index, w_length);
}
/* respond with data transfer or status phase? */
if (value >= 0) {
DBG(cdev, "rndis req%02x.%02x v%04x i%04x l%d\n",
ctrl->bRequestType, ctrl->bRequest,
w_value, w_index, w_length);
req->context = rndis;
req->zero = (value < w_length);
req->length = value;
value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
if (value < 0)
pr_err("rndis response on err %d\n", value);
}
/* device either stalls (value < 0) or reports success */
return value;
}
static int rndis_qc_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
{
struct f_rndis_qc *rndis = func_to_rndis_qc(f);
struct usb_composite_dev *cdev = f->config->cdev;
/* we know alt == 0 */
if (intf == rndis->ctrl_id) {
if (rndis->notify->driver_data) {
VDBG(cdev, "reset rndis control %d\n", intf);
usb_ep_disable(rndis->notify);
}
if (!rndis->notify->desc) {
VDBG(cdev, "init rndis ctrl %d\n", intf);
if (config_ep_by_speed(cdev->gadget, f, rndis->notify))
goto fail;
}
usb_ep_enable(rndis->notify);
rndis->notify->driver_data = rndis;
} else if (intf == rndis->data_id) {
struct net_device *net;
rndis->net_ready_trigger = false;
if (rndis->port.in_ep->driver_data) {
DBG(cdev, "reset rndis\n");
/* rndis->port is needed for disconnecting the BAM data
* path. Only after the BAM data path is disconnected,
* we can disconnect the port from the network layer.
*/
bam_data_disconnect(&rndis->bam_port, USB_FUNC_RNDIS,
rndis->port_num);
if (rndis->xport != USB_GADGET_XPORT_BAM2BAM_IPA)
gether_qc_disconnect_name(&rndis->port,
"rndis0");
}
if (!rndis->port.in_ep->desc || !rndis->port.out_ep->desc) {
DBG(cdev, "init rndis\n");
if (config_ep_by_speed(cdev->gadget, f,
rndis->port.in_ep) ||
config_ep_by_speed(cdev->gadget, f,
rndis->port.out_ep)) {
rndis->port.in_ep->desc = NULL;
rndis->port.out_ep->desc = NULL;
goto fail;
}
}
if (rndis->xport == USB_GADGET_XPORT_BAM2BAM_IPA &&
gadget_is_dwc3(cdev->gadget)) {
if (msm_ep_config(rndis->port.in_ep) ||
msm_ep_config(rndis->port.out_ep)) {
pr_err("%s: ep_config failed\n",
__func__);
goto fail;
}
} else
pr_debug("RNDIS is being used with non DWC3 core\n");
/* Avoid ZLPs; they can be troublesome. */
rndis->port.is_zlp_ok = false;
/* RNDIS should be in the "RNDIS uninitialized" state,
* either never activated or after rndis_uninit().
*
* We don't want data to flow here until a nonzero packet
* filter is set, at which point it enters "RNDIS data
* initialized" state ... but we do want the endpoints
* to be activated. It's a strange little state.
*
* REVISIT the RNDIS gadget code has done this wrong for a
* very long time. We need another call to the link layer
* code -- gether_updown(...bool) maybe -- to do it right.
*/
rndis->port.cdc_filter = 0;
rndis->bam_port.cdev = cdev;
rndis->bam_port.func = &rndis->port.func;
rndis->bam_port.in = rndis->port.in_ep;
rndis->bam_port.out = rndis->port.out_ep;
if (bam_data_connect(&rndis->bam_port, rndis->xport,
rndis->port_num, USB_FUNC_RNDIS))
goto fail;
DBG(cdev, "RNDIS RX/TX early activation ...\n");
if (rndis->xport != USB_GADGET_XPORT_BAM2BAM_IPA) {
net = gether_qc_connect_name(&rndis->port, "rndis0",
false);
} else {
rndis_qc_open(&rndis->port);
net = gether_qc_get_net("rndis0");
}
if (IS_ERR(net))
return PTR_ERR(net);
rndis_set_param_dev(rndis->config, net,
&rndis->port.cdc_filter);
} else
goto fail;
return 0;
fail:
return -EINVAL;
}
static void rndis_qc_disable(struct usb_function *f)
{
struct f_rndis_qc *rndis = func_to_rndis_qc(f);
struct usb_composite_dev *cdev = f->config->cdev;
if (!rndis->notify->driver_data)
return;
pr_info("rndis deactivated\n");
rndis_uninit(rndis->config);
bam_data_disconnect(&rndis->bam_port, USB_FUNC_RNDIS, rndis->port_num);
if (rndis->xport != USB_GADGET_XPORT_BAM2BAM_IPA)
gether_qc_disconnect_name(&rndis->port, "rndis0");
if (rndis->xport == USB_GADGET_XPORT_BAM2BAM_IPA &&
gadget_is_dwc3(cdev->gadget)) {
msm_ep_unconfig(rndis->port.out_ep);
msm_ep_unconfig(rndis->port.in_ep);
}
usb_ep_disable(rndis->notify);
rndis->notify->driver_data = NULL;
}
static void rndis_qc_suspend(struct usb_function *f)
{
struct f_rndis_qc *rndis = func_to_rndis_qc(f);
bool remote_wakeup_allowed;
if (f->config->cdev->gadget->speed == USB_SPEED_SUPER)
remote_wakeup_allowed = f->func_wakeup_allowed;
else
remote_wakeup_allowed = f->config->cdev->gadget->remote_wakeup;
pr_info("%s(): start rndis suspend: remote_wakeup_allowed:%d\n:",
__func__, remote_wakeup_allowed);
if (!remote_wakeup_allowed) {
/* This is required as Linux host side RNDIS driver doesn't
* send RNDIS_MESSAGE_PACKET_FILTER before suspending USB bus.
* Hence we perform same operations explicitly here for Linux
* host case. In case of windows, this RNDIS state machine is
* already updated due to receiving of PACKET_FILTER.
*/
rndis_flow_control(rndis->config, true);
pr_debug("%s(): Disconnecting\n", __func__);
}
bam_data_suspend(&rndis->bam_port, rndis->port_num, USB_FUNC_RNDIS,
remote_wakeup_allowed);
pr_debug("rndis suspended\n");
}
static void rndis_qc_resume(struct usb_function *f)
{
struct f_rndis_qc *rndis = func_to_rndis_qc(f);
bool remote_wakeup_allowed;
pr_debug("%s: rndis resumed\n", __func__);
/* Nothing to do if DATA interface wasn't initialized */
if (!rndis->bam_port.cdev) {
pr_debug("data interface was not up\n");
return;
}
if (f->config->cdev->gadget->speed == USB_SPEED_SUPER)
remote_wakeup_allowed = f->func_wakeup_allowed;
else
remote_wakeup_allowed = f->config->cdev->gadget->remote_wakeup;
bam_data_resume(&rndis->bam_port, rndis->port_num, USB_FUNC_RNDIS,
remote_wakeup_allowed);
if (!remote_wakeup_allowed) {
if (rndis->xport == USB_GADGET_XPORT_BAM2BAM_IPA)
rndis_qc_open(&rndis->port);
/*
* Linux Host doesn't sends RNDIS_MSG_INIT or non-zero value
* set with RNDIS_MESSAGE_PACKET_FILTER after performing bus
* resume. Hence trigger USB IPA transfer functionality
* explicitly here. For Windows host case is also being
* handle with RNDIS state machine.
*/
rndis_flow_control(rndis->config, false);
}
pr_debug("%s: RNDIS resume completed\n", __func__);
}
/*-------------------------------------------------------------------------*/
/*
* This isn't quite the same mechanism as CDC Ethernet, since the
* notification scheme passes less data, but the same set of link
* states must be tested. A key difference is that altsettings are
* not used to tell whether the link should send packets or not.
*/
static void rndis_qc_open(struct qc_gether *geth)
{
struct f_rndis_qc *rndis = func_to_rndis_qc(&geth->func);
struct usb_composite_dev *cdev = geth->func.config->cdev;
DBG(cdev, "%s\n", __func__);
rndis_set_param_medium(rndis->config, RNDIS_MEDIUM_802_3,
rndis_qc_bitrate(cdev->gadget) / 100);
rndis_signal_connect(rndis->config);
}
static void rndis_qc_close(struct qc_gether *geth)
{
struct f_rndis_qc *rndis = func_to_rndis_qc(&geth->func);
DBG(geth->func.config->cdev, "%s\n", __func__);
rndis_set_param_medium(rndis->config, RNDIS_MEDIUM_802_3, 0);
rndis_signal_disconnect(rndis->config);
}
/*-------------------------------------------------------------------------*/
/* ethernet function driver setup/binding */
static int
rndis_qc_bind(struct usb_configuration *c, struct usb_function *f)
{
struct usb_composite_dev *cdev = c->cdev;
struct f_rndis_qc *rndis = func_to_rndis_qc(f);
int status;
struct usb_ep *ep;
/* allocate instance-specific interface IDs */
status = usb_interface_id(c, f);
if (status < 0)
goto fail;
rndis->ctrl_id = status;
rndis_qc_iad_descriptor.bFirstInterface = status;
rndis_qc_control_intf.bInterfaceNumber = status;
rndis_qc_union_desc.bMasterInterface0 = status;
status = usb_interface_id(c, f);
if (status < 0)
goto fail;
rndis->data_id = status;
rndis_qc_data_intf.bInterfaceNumber = status;
rndis_qc_union_desc.bSlaveInterface0 = status;
status = -ENODEV;
/* allocate instance-specific endpoints */
ep = usb_ep_autoconfig(cdev->gadget, &rndis_qc_fs_in_desc);
if (!ep)
goto fail;
rndis->port.in_ep = ep;
ep->driver_data = cdev; /* claim */
ep = usb_ep_autoconfig(cdev->gadget, &rndis_qc_fs_out_desc);
if (!ep)
goto fail;
rndis->port.out_ep = ep;
ep->driver_data = cdev; /* claim */
/* NOTE: a status/notification endpoint is, strictly speaking,
* optional. We don't treat it that way though! It's simpler,
* and some newer profiles don't treat it as optional.
*/
ep = usb_ep_autoconfig(cdev->gadget, &rndis_qc_fs_notify_desc);
if (!ep)
goto fail;
rndis->notify = ep;
ep->driver_data = cdev; /* claim */
status = -ENOMEM;
/* allocate notification request and buffer */
rndis->notify_req = usb_ep_alloc_request(ep, GFP_KERNEL);
if (!rndis->notify_req)
goto fail;
rndis->notify_req->buf = kmalloc(RNDIS_QC_STATUS_BYTECOUNT, GFP_KERNEL);
if (!rndis->notify_req->buf)
goto fail;
rndis->notify_req->length = RNDIS_QC_STATUS_BYTECOUNT;
rndis->notify_req->context = rndis;
rndis->notify_req->complete = rndis_qc_response_complete;
/* copy descriptors, and track endpoint copies */
f->fs_descriptors = usb_copy_descriptors(eth_qc_fs_function);
if (!f->fs_descriptors)
goto fail;
/* support all relevant hardware speeds... we expect that when
* hardware is dual speed, all bulk-capable endpoints work at
* both speeds
*/
if (gadget_is_dualspeed(c->cdev->gadget)) {
rndis_qc_hs_in_desc.bEndpointAddress =
rndis_qc_fs_in_desc.bEndpointAddress;
rndis_qc_hs_out_desc.bEndpointAddress =
rndis_qc_fs_out_desc.bEndpointAddress;
rndis_qc_hs_notify_desc.bEndpointAddress =
rndis_qc_fs_notify_desc.bEndpointAddress;
/* copy descriptors, and track endpoint copies */
f->hs_descriptors = usb_copy_descriptors(eth_qc_hs_function);
if (!f->hs_descriptors)
goto fail;
}
if (gadget_is_superspeed(c->cdev->gadget)) {
rndis_qc_ss_in_desc.bEndpointAddress =
rndis_qc_fs_in_desc.bEndpointAddress;
rndis_qc_ss_out_desc.bEndpointAddress =
rndis_qc_fs_out_desc.bEndpointAddress;
rndis_qc_ss_notify_desc.bEndpointAddress =
rndis_qc_fs_notify_desc.bEndpointAddress;
/* copy descriptors, and track endpoint copies */
f->ss_descriptors = usb_copy_descriptors(eth_qc_ss_function);
if (!f->ss_descriptors)
goto fail;
}
rndis->port.open = rndis_qc_open;
rndis->port.close = rndis_qc_close;
status = rndis_register(rndis_qc_response_available, rndis);
if (status < 0)
goto fail;
rndis->config = status;
rndis_set_param_medium(rndis->config, RNDIS_MEDIUM_802_3, 0);
rndis_set_host_mac(rndis->config, rndis->ethaddr);
if (rndis->manufacturer && rndis->vendorID &&
rndis_set_param_vendor(rndis->config, rndis->vendorID,
rndis->manufacturer))
goto fail;
pr_debug("%s(): max_pkt_per_xfer:%d\n", __func__,
rndis->ul_max_pkt_per_xfer);
rndis_set_max_pkt_xfer(rndis->config, rndis->ul_max_pkt_per_xfer);
/* In case of aggregated packets QC device will request
* aliment to 4 (2^2).
*/
pr_debug("%s(): pkt_alignment_factor:%d\n", __func__,
rndis->pkt_alignment_factor);
rndis_set_pkt_alignment_factor(rndis->config,
rndis->pkt_alignment_factor);
/* NOTE: all that is done without knowing or caring about
* the network link ... which is unavailable to this code
* until we're activated via set_alt().
*/
DBG(cdev, "RNDIS: %s speed IN/%s OUT/%s NOTIFY/%s\n",
gadget_is_superspeed(c->cdev->gadget) ? "super" :
gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
rndis->port.in_ep->name, rndis->port.out_ep->name,
rndis->notify->name);
return 0;
fail:
if (gadget_is_superspeed(c->cdev->gadget) && f->ss_descriptors)
usb_free_descriptors(f->ss_descriptors);
if (gadget_is_dualspeed(c->cdev->gadget) && f->hs_descriptors)
usb_free_descriptors(f->hs_descriptors);
if (f->fs_descriptors)
usb_free_descriptors(f->fs_descriptors);
if (rndis->notify_req) {
kfree(rndis->notify_req->buf);
usb_ep_free_request(rndis->notify, rndis->notify_req);
}
/* we might as well release our claims on endpoints */
if (rndis->notify)
rndis->notify->driver_data = NULL;
if (rndis->port.out_ep->desc)
rndis->port.out_ep->driver_data = NULL;
if (rndis->port.in_ep->desc)
rndis->port.in_ep->driver_data = NULL;
pr_err("%s: can't bind, err %d\n", f->name, status);
return status;
}
static void
rndis_qc_unbind(struct usb_configuration *c, struct usb_function *f)
{
struct f_rndis_qc *rndis = func_to_rndis_qc(f);
unsigned long flags;
pr_debug("rndis_qc_unbind: free\n");
rndis_deregister(rndis->config);
rndis_exit();
if (gadget_is_dualspeed(c->cdev->gadget))
usb_free_descriptors(f->hs_descriptors);
usb_free_descriptors(f->fs_descriptors);
kfree(rndis->notify_req->buf);
usb_ep_free_request(rndis->notify, rndis->notify_req);
if (rndis->xport == USB_GADGET_XPORT_BAM2BAM_IPA) {
/*
* call flush_workqueue to make sure that any pending
* disconnect_work() from u_bam_data.c file is being
* flushed before calling this rndis_ipa_cleanup API
* as rndis ipa disconnect API is required to be
* called before this.
*/
bam_data_flush_workqueue();
rndis_ipa_cleanup(rndis_ipa_params.private);
rndis_ipa_supported = false;
}
spin_lock_irqsave(&rndis_lock, flags);
kfree(rndis);
_rndis_qc = NULL;
spin_unlock_irqrestore(&rndis_lock, flags);
}
bool is_rndis_ipa_supported(void)
{
return rndis_ipa_supported;
}
void rndis_ipa_reset_trigger(void)
{
struct f_rndis_qc *rndis;
unsigned long flags;
spin_lock_irqsave(&rndis_lock, flags);
rndis = _rndis_qc;
if (!rndis) {
pr_err("%s: No RNDIS instance", __func__);
spin_unlock_irqrestore(&rndis_lock, flags);
return;
}
rndis->net_ready_trigger = false;
spin_unlock_irqrestore(&rndis_lock, flags);
}
/*
* Callback let RNDIS_IPA trigger us when network interface is up
* and userspace is ready to answer DHCP requests
*/
void rndis_net_ready_notify(void)
{
struct f_rndis_qc *rndis;
unsigned long flags;
int port_num;
spin_lock_irqsave(&rndis_lock, flags);
rndis = _rndis_qc;
if (!rndis) {
pr_err("%s: No RNDIS instance", __func__);
spin_unlock_irqrestore(&rndis_lock, flags);
return;
}
if (rndis->net_ready_trigger) {
pr_err("%s: Already triggered", __func__);
spin_unlock_irqrestore(&rndis_lock, flags);
return;
}
pr_debug("%s: Set net_ready_trigger", __func__);
rndis->net_ready_trigger = true;
spin_unlock_irqrestore(&rndis_lock, flags);
port_num = (u_bam_data_func_to_port(USB_FUNC_RNDIS,
RNDIS_QC_ACTIVE_PORT));
if (port_num < 0)
return;
bam_data_start_rx_tx(port_num);
}
/* Some controllers can't support RNDIS ... */
static inline bool can_support_rndis_qc(struct usb_configuration *c)
{
/* everything else is *presumably* fine */
return true;
}
/**
* rndis_qc_bind_config - add RNDIS network link to a configuration
* @c: the configuration to support the network link
* @ethaddr: a buffer in which the ethernet address of the host side
* side of the link was recorded
* Context: single threaded during gadget setup
*
* Returns zero on success, else negative errno.
*
* Caller must have called @gether_setup(). Caller is also responsible
* for calling @gether_cleanup() before module unload.
*/
int
rndis_qc_bind_config(struct usb_configuration *c, u8 ethaddr[ETH_ALEN])
{
return rndis_qc_bind_config_vendor(c, ethaddr, 0, NULL, 1, 0, NULL);
}
int
rndis_qc_bind_config_vendor(struct usb_configuration *c, u8 ethaddr[ETH_ALEN],
u32 vendorID, const char *manufacturer,
u8 max_pkt_per_xfer,
u8 pkt_alignment_factor,
char *xport_name)
{
struct f_rndis_qc *rndis;
int status;
if (!can_support_rndis_qc(c) || !ethaddr) {
pr_debug("%s: invalid argument\n", __func__);
return -EINVAL;
}
/* setup RNDIS itself */
status = rndis_init();
if (status < 0)
return status;
/* maybe allocate device-global string IDs */
if (rndis_qc_string_defs[0].id == 0) {
/* control interface label */
status = usb_string_id(c->cdev);
if (status < 0)
return status;
rndis_qc_string_defs[0].id = status;
rndis_qc_control_intf.iInterface = status;
/* data interface label */
status = usb_string_id(c->cdev);
if (status < 0)
return status;
rndis_qc_string_defs[1].id = status;
rndis_qc_data_intf.iInterface = status;
/* IAD iFunction label */
status = usb_string_id(c->cdev);
if (status < 0)
return status;
rndis_qc_string_defs[2].id = status;
rndis_qc_iad_descriptor.iFunction = status;
}
/* allocate and initialize one new instance */
status = -ENOMEM;
rndis = kzalloc(sizeof *rndis, GFP_KERNEL);
if (!rndis) {
pr_err("%s: fail allocate and initialize new instance\n",
__func__);
goto fail;
}
rndis->xport = str_to_xport(xport_name);
/* export host's Ethernet address in CDC format */
if (rndis->xport == USB_GADGET_XPORT_BAM2BAM_IPA) {
gether_qc_get_macs(rndis_ipa_params.device_ethaddr,
rndis_ipa_params.host_ethaddr);
pr_debug("setting host_ethaddr=%pM, device_ethaddr=%pM\n",
rndis_ipa_params.host_ethaddr,
rndis_ipa_params.device_ethaddr);
rndis_ipa_supported = true;
#ifdef CONFIG_USB_ANDROID_SAMSUNG_COMPOSITE
memcpy(rndis->ethaddr, ethaddr, ETH_ALEN);
printk(KERN_DEBUG "usb: set unique host mac\n");
#else
memcpy(rndis->ethaddr, &rndis_ipa_params.host_ethaddr,
ETH_ALEN);
#endif
rndis_ipa_params.device_ready_notify = rndis_net_ready_notify;
} else
memcpy(rndis->ethaddr, ethaddr, ETH_ALEN);
rndis->vendorID = vendorID;
rndis->manufacturer = manufacturer;
/* if max_pkt_per_xfer was not configured set to default value */
rndis->ul_max_pkt_per_xfer =
max_pkt_per_xfer ? max_pkt_per_xfer :
DEFAULT_MAX_PKT_PER_XFER;
u_bam_data_set_ul_max_pkt_num(rndis->ul_max_pkt_per_xfer);
/*
* Check no RNDIS aggregation, and alignment if not mentioned,
* use alignment factor as zero. If aggregated RNDIS data transfer,
* max packet per transfer would be default if it is not set
* explicitly, and same way use alignment factor as 2 by default.
* This would eliminate need of writing to sysfs if default RNDIS
* aggregation setting required. Writing to both sysfs entries,
* those values will always override default values.
*/
if ((rndis->pkt_alignment_factor == 0) &&
(rndis->ul_max_pkt_per_xfer == 1))
rndis->pkt_alignment_factor = 0;
else
rndis->pkt_alignment_factor = pkt_alignment_factor ?
pkt_alignment_factor :
DEFAULT_PKT_ALIGNMENT_FACTOR;
/* RNDIS activates when the host changes this filter */
rndis->port.cdc_filter = 0;
/* RNDIS has special (and complex) framing */
rndis->port.header_len = sizeof(struct rndis_packet_msg_type);
rndis->port.wrap = rndis_qc_add_header;
rndis->port.unwrap = rndis_qc_rm_hdr;
rndis->port.func.name = "rndis";
rndis->port.func.strings = rndis_qc_strings;
/* descriptors are per-instance copies */
rndis->port.func.bind = rndis_qc_bind;
rndis->port.func.unbind = rndis_qc_unbind;
rndis->port.func.set_alt = rndis_qc_set_alt;
rndis->port.func.setup = rndis_qc_setup;
rndis->port.func.disable = rndis_qc_disable;
rndis->port.func.suspend = rndis_qc_suspend;
rndis->port.func.resume = rndis_qc_resume;
if (rndis->xport == USB_GADGET_XPORT_BAM2BAM_IPA) {
status = rndis_ipa_init(&rndis_ipa_params);
if (status) {
pr_err("%s: failed to init rndis_ipa\n", __func__);
goto fail;
}
}
status = usb_add_function(c, &rndis->port.func);
if (status) {
if (rndis->xport == USB_GADGET_XPORT_BAM2BAM_IPA)
rndis_ipa_cleanup(rndis_ipa_params.private);
goto fail;
}
_rndis_qc = rndis;
return 0;
fail:
kfree(rndis);
_rndis_qc = NULL;
rndis_exit();
return status;
}
static int rndis_qc_open_dev(struct inode *ip, struct file *fp)
{
int ret = 0;
unsigned long flags;
pr_info("Open rndis QC driver\n");
spin_lock_irqsave(&rndis_lock, flags);
if (!_rndis_qc) {
pr_err("rndis_qc_dev not created yet\n");
ret = -ENODEV;
goto fail;
}
if (rndis_qc_lock(&_rndis_qc->open_excl)) {
pr_err("Already opened\n");
ret = -EBUSY;
goto fail;
}
fp->private_data = _rndis_qc;
fail:
spin_unlock_irqrestore(&rndis_lock, flags);
if (!ret)
pr_info("rndis QC file opened\n");
return ret;
}
static int rndis_qc_release_dev(struct inode *ip, struct file *fp)
{
unsigned long flags;
pr_info("Close rndis QC file\n");
spin_lock_irqsave(&rndis_lock, flags);
if (!_rndis_qc) {
pr_err("rndis_qc_dev not present\n");
spin_unlock_irqrestore(&rndis_lock, flags);
return -ENODEV;
}
rndis_qc_unlock(&_rndis_qc->open_excl);
spin_unlock_irqrestore(&rndis_lock, flags);
return 0;
}
static long rndis_qc_ioctl(struct file *fp, unsigned cmd, unsigned long arg)
{
u8 qc_max_pkt_per_xfer = 0;
u32 qc_max_pkt_size = 0;
int ret = 0;
unsigned long flags;
spin_lock_irqsave(&rndis_lock, flags);
if (!_rndis_qc) {
pr_err("rndis_qc_dev not present\n");
ret = -ENODEV;
goto fail;
}
qc_max_pkt_per_xfer = _rndis_qc->ul_max_pkt_per_xfer;
qc_max_pkt_size = _rndis_qc->max_pkt_size;
if (rndis_qc_lock(&_rndis_qc->ioctl_excl)) {
ret = -EBUSY;
goto fail;
}
spin_unlock_irqrestore(&rndis_lock, flags);
pr_info("Received command %d\n", cmd);
switch (cmd) {
case RNDIS_QC_GET_MAX_PKT_PER_XFER:
ret = copy_to_user((void __user *)arg,
&qc_max_pkt_per_xfer,
sizeof(qc_max_pkt_per_xfer));
if (ret) {
pr_err("copying to user space failed\n");
ret = -EFAULT;
}
pr_info("Sent UL max packets per xfer %d\n",
qc_max_pkt_per_xfer);
break;
case RNDIS_QC_GET_MAX_PKT_SIZE:
ret = copy_to_user((void __user *)arg,
&qc_max_pkt_size,
sizeof(qc_max_pkt_size));
if (ret) {
pr_err("copying to user space failed\n");
ret = -EFAULT;
}
pr_debug("Sent max packet size %d\n",
qc_max_pkt_size);
break;
default:
pr_err("Unsupported IOCTL\n");
ret = -EINVAL;
}
spin_lock_irqsave(&rndis_lock, flags);
if (!_rndis_qc) {
pr_err("rndis_qc_dev not present\n");
ret = -ENODEV;
goto fail;
}
rndis_qc_unlock(&_rndis_qc->ioctl_excl);
fail:
spin_unlock_irqrestore(&rndis_lock, flags);
return ret;
}
static const struct file_operations rndis_qc_fops = {
.owner = THIS_MODULE,
.open = rndis_qc_open_dev,
.release = rndis_qc_release_dev,
.unlocked_ioctl = rndis_qc_ioctl,
};
static struct miscdevice rndis_qc_device = {
.minor = MISC_DYNAMIC_MINOR,
.name = "android_rndis_qc",
.fops = &rndis_qc_fops,
};
static int rndis_qc_init(void)
{
int ret;
pr_info("initialize rndis QC instance\n");
spin_lock_init(&rndis_lock);
ret = misc_register(&rndis_qc_device);
if (ret)
pr_err("rndis QC driver failed to register\n");
ret = bam_data_setup(USB_FUNC_RNDIS, RNDIS_QC_NO_PORTS);
if (ret) {
pr_err("bam_data_setup failed err: %d\n", ret);
return ret;
}
return ret;
}
static void rndis_qc_cleanup(void)
{
pr_info("rndis QC cleanup\n");
misc_deregister(&rndis_qc_device);
}
void *rndis_qc_get_ipa_rx_cb(void)
{
return rndis_ipa_params.ipa_rx_notify;
}
void *rndis_qc_get_ipa_tx_cb(void)
{
return rndis_ipa_params.ipa_tx_notify;
}
void *rndis_qc_get_ipa_priv(void)
{
return rndis_ipa_params.private;
}
bool rndis_qc_get_skip_ep_config(void)
{
return rndis_ipa_params.skip_ep_cfg;
}
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