blob: a7166e24bbad9bb0ad3d967f5364b5c8af667c0c [file] [log] [blame]
/*
* Copyright (c) 2011, 2013-2018, The Linux Foundation. All rights reserved.
* Linux Foundation chooses to take subject only to the GPLv2 license terms,
* and distributes only under these terms.
*
* This code also borrows from drivers/usb/gadget/u_serial.c, which is
* Copyright (C) 2000 - 2003 Al Borchers (alborchers@steinerpoint.com)
* Copyright (C) 2008 David Brownell
* Copyright (C) 2008 by Nokia Corporation
* Copyright (C) 1999 - 2002 Greg Kroah-Hartman (greg@kroah.com)
* Copyright (C) 2000 Peter Berger (pberger@brimson.com)
*
* f_cdev_read() API implementation is using borrowed code from
* drivers/usb/gadget/legacy/printer.c, which is
* Copyright (C) 2003-2005 David Brownell
* Copyright (C) 2006 Craig W. Nadler
*
* 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.
*/
#ifdef pr_fmt
#undef pr_fmt
#endif
#define pr_fmt(fmt) "%s: " fmt, __func__
#include <linux/wait.h>
#include <linux/poll.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/cdev.h>
#include <linux/spinlock.h>
#include <linux/usb/gadget.h>
#include <linux/usb/cdc.h>
#include <linux/usb/composite.h>
#include <linux/module.h>
#include <asm/ioctls.h>
#include <asm-generic/termios.h>
#define DEVICE_NAME "at_usb"
#define MODULE_NAME "msm_usb_bridge"
#define NUM_INSTANCE 3
#define MAX_CDEV_INST_NAME 15
#define MAX_CDEV_FUNC_NAME 5
#define BRIDGE_RX_QUEUE_SIZE 8
#define BRIDGE_RX_BUF_SIZE 2048
#define BRIDGE_TX_QUEUE_SIZE 8
#define BRIDGE_TX_BUF_SIZE 2048
#define GS_LOG2_NOTIFY_INTERVAL 5 /* 1 << 5 == 32 msec */
#define GS_NOTIFY_MAXPACKET 10 /* notification + 2 bytes */
struct cserial {
struct usb_function func;
struct usb_ep *in;
struct usb_ep *out;
struct usb_ep *notify;
struct usb_request *notify_req;
struct usb_cdc_line_coding port_line_coding;
u8 pending;
u8 q_again;
u8 data_id;
u16 serial_state;
u16 port_handshake_bits;
/* control signal callbacks*/
unsigned int (*get_dtr)(struct cserial *p);
unsigned int (*get_rts)(struct cserial *p);
/* notification callbacks */
void (*connect)(struct cserial *p);
void (*disconnect)(struct cserial *p);
int (*send_break)(struct cserial *p, int duration);
unsigned int (*send_carrier_detect)(struct cserial *p,
unsigned int val);
unsigned int (*send_ring_indicator)(struct cserial *p,
unsigned int val);
int (*send_modem_ctrl_bits)(struct cserial *p, int ctrl_bits);
/* notification changes to modem */
void (*notify_modem)(void *port, int ctrl_bits);
};
struct f_cdev {
struct cdev fcdev_cdev;
struct device *dev;
unsigned int port_num;
char name[sizeof(DEVICE_NAME) + 2];
int minor;
spinlock_t port_lock;
wait_queue_head_t open_wq;
wait_queue_head_t read_wq;
struct list_head read_pool;
struct list_head read_queued;
struct list_head write_pool;
/* current active USB RX request */
struct usb_request *current_rx_req;
/* number of pending bytes */
size_t pending_rx_bytes;
/* current USB RX buffer */
u8 *current_rx_buf;
struct cserial port_usb;
#define ACM_CTRL_DTR 0x01
#define ACM_CTRL_RTS 0x02
#define ACM_CTRL_DCD 0x01
#define ACM_CTRL_DSR 0x02
#define ACM_CTRL_BRK 0x04
#define ACM_CTRL_RI 0x08
unsigned int cbits_to_modem;
bool cbits_updated;
struct workqueue_struct *fcdev_wq;
bool is_connected;
bool port_open;
unsigned long nbytes_from_host;
unsigned long nbytes_to_host;
unsigned long nbytes_to_port_bridge;
unsigned long nbytes_from_port_bridge;
};
struct f_cdev_opts {
struct usb_function_instance func_inst;
struct f_cdev *port;
char *func_name;
u8 port_num;
};
static int major, minors;
struct class *fcdev_classp;
static DEFINE_IDA(chardev_ida);
static DEFINE_MUTEX(chardev_ida_lock);
static int usb_cser_alloc_chardev_region(void);
static void usb_cser_chardev_deinit(void);
static void usb_cser_read_complete(struct usb_ep *ep, struct usb_request *req);
static int usb_cser_connect(struct f_cdev *port);
static void usb_cser_disconnect(struct f_cdev *port);
static struct f_cdev *f_cdev_alloc(char *func_name, int portno);
static void usb_cser_free_req(struct usb_ep *ep, struct usb_request *req);
static struct usb_interface_descriptor cser_interface_desc = {
.bLength = USB_DT_INTERFACE_SIZE,
.bDescriptorType = USB_DT_INTERFACE,
/* .bInterfaceNumber = DYNAMIC */
.bNumEndpoints = 3,
.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
.bInterfaceSubClass = 0,
.bInterfaceProtocol = 0,
/* .iInterface = DYNAMIC */
};
static struct usb_cdc_header_desc cser_header_desc = {
.bLength = sizeof(cser_header_desc),
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = USB_CDC_HEADER_TYPE,
.bcdCDC = cpu_to_le16(0x0110),
};
static struct usb_cdc_call_mgmt_descriptor
cser_call_mgmt_descriptor = {
.bLength = sizeof(cser_call_mgmt_descriptor),
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = USB_CDC_CALL_MANAGEMENT_TYPE,
.bmCapabilities = 0,
/* .bDataInterface = DYNAMIC */
};
static struct usb_cdc_acm_descriptor cser_descriptor = {
.bLength = sizeof(cser_descriptor),
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = USB_CDC_ACM_TYPE,
.bmCapabilities = USB_CDC_CAP_LINE,
};
static struct usb_cdc_union_desc cser_union_desc = {
.bLength = sizeof(cser_union_desc),
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = USB_CDC_UNION_TYPE,
/* .bMasterInterface0 = DYNAMIC */
/* .bSlaveInterface0 = DYNAMIC */
};
/* full speed support: */
static struct usb_endpoint_descriptor cser_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(GS_NOTIFY_MAXPACKET),
.bInterval = 1 << GS_LOG2_NOTIFY_INTERVAL,
};
static struct usb_endpoint_descriptor cser_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 cser_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 *cser_fs_function[] = {
(struct usb_descriptor_header *) &cser_interface_desc,
(struct usb_descriptor_header *) &cser_header_desc,
(struct usb_descriptor_header *) &cser_call_mgmt_descriptor,
(struct usb_descriptor_header *) &cser_descriptor,
(struct usb_descriptor_header *) &cser_union_desc,
(struct usb_descriptor_header *) &cser_fs_notify_desc,
(struct usb_descriptor_header *) &cser_fs_in_desc,
(struct usb_descriptor_header *) &cser_fs_out_desc,
NULL,
};
/* high speed support: */
static struct usb_endpoint_descriptor cser_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(GS_NOTIFY_MAXPACKET),
.bInterval = GS_LOG2_NOTIFY_INTERVAL+4,
};
static struct usb_endpoint_descriptor cser_hs_in_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = cpu_to_le16(512),
};
static struct usb_endpoint_descriptor cser_hs_out_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = cpu_to_le16(512),
};
static struct usb_descriptor_header *cser_hs_function[] = {
(struct usb_descriptor_header *) &cser_interface_desc,
(struct usb_descriptor_header *) &cser_header_desc,
(struct usb_descriptor_header *) &cser_call_mgmt_descriptor,
(struct usb_descriptor_header *) &cser_descriptor,
(struct usb_descriptor_header *) &cser_union_desc,
(struct usb_descriptor_header *) &cser_hs_notify_desc,
(struct usb_descriptor_header *) &cser_hs_in_desc,
(struct usb_descriptor_header *) &cser_hs_out_desc,
NULL,
};
static struct usb_endpoint_descriptor cser_ss_in_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = cpu_to_le16(1024),
};
static struct usb_endpoint_descriptor cser_ss_out_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = cpu_to_le16(1024),
};
static struct usb_ss_ep_comp_descriptor cser_ss_bulk_comp_desc = {
.bLength = sizeof(cser_ss_bulk_comp_desc),
.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
};
static struct usb_endpoint_descriptor cser_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(GS_NOTIFY_MAXPACKET),
.bInterval = GS_LOG2_NOTIFY_INTERVAL+4,
};
static struct usb_ss_ep_comp_descriptor cser_ss_notify_comp_desc = {
.bLength = sizeof(cser_ss_notify_comp_desc),
.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
/* the following 2 values can be tweaked if necessary */
/* .bMaxBurst = 0, */
/* .bmAttributes = 0, */
.wBytesPerInterval = cpu_to_le16(GS_NOTIFY_MAXPACKET),
};
static struct usb_descriptor_header *cser_ss_function[] = {
(struct usb_descriptor_header *) &cser_interface_desc,
(struct usb_descriptor_header *) &cser_header_desc,
(struct usb_descriptor_header *) &cser_call_mgmt_descriptor,
(struct usb_descriptor_header *) &cser_descriptor,
(struct usb_descriptor_header *) &cser_union_desc,
(struct usb_descriptor_header *) &cser_ss_notify_desc,
(struct usb_descriptor_header *) &cser_ss_notify_comp_desc,
(struct usb_descriptor_header *) &cser_ss_in_desc,
(struct usb_descriptor_header *) &cser_ss_bulk_comp_desc,
(struct usb_descriptor_header *) &cser_ss_out_desc,
(struct usb_descriptor_header *) &cser_ss_bulk_comp_desc,
NULL,
};
/* string descriptors: */
static struct usb_string cser_string_defs[] = {
[0].s = "CDEV Serial",
{ } /* end of list */
};
static struct usb_gadget_strings cser_string_table = {
.language = 0x0409, /* en-us */
.strings = cser_string_defs,
};
static struct usb_gadget_strings *usb_cser_strings[] = {
&cser_string_table,
NULL,
};
static inline struct f_cdev *func_to_port(struct usb_function *f)
{
return container_of(f, struct f_cdev, port_usb.func);
}
static inline struct f_cdev *cser_to_port(struct cserial *cser)
{
return container_of(cser, struct f_cdev, port_usb);
}
static unsigned int convert_acm_sigs_to_uart(unsigned int acm_sig)
{
unsigned int uart_sig = 0;
acm_sig &= (ACM_CTRL_DTR | ACM_CTRL_RTS);
if (acm_sig & ACM_CTRL_DTR)
uart_sig |= TIOCM_DTR;
if (acm_sig & ACM_CTRL_RTS)
uart_sig |= TIOCM_RTS;
return uart_sig;
}
static void port_complete_set_line_coding(struct usb_ep *ep,
struct usb_request *req)
{
struct f_cdev *port = ep->driver_data;
struct usb_composite_dev *cdev = port->port_usb.func.config->cdev;
if (req->status != 0) {
dev_dbg(&cdev->gadget->dev, "port(%s) completion, err %d\n",
port->name, req->status);
return;
}
/* normal completion */
if (req->actual != sizeof(port->port_usb.port_line_coding)) {
dev_dbg(&cdev->gadget->dev, "port(%s) short resp, len %d\n",
port->name, req->actual);
usb_ep_set_halt(ep);
} else {
struct usb_cdc_line_coding *value = req->buf;
port->port_usb.port_line_coding = *value;
}
}
static void usb_cser_free_func(struct usb_function *f)
{
/* Do nothing as cser_alloc() doesn't alloc anything. */
}
static int
usb_cser_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
{
struct f_cdev *port = func_to_port(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);
switch ((ctrl->bRequestType << 8) | ctrl->bRequest) {
/* SET_LINE_CODING ... just read and save what the host sends */
case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
| USB_CDC_REQ_SET_LINE_CODING:
if (w_length != sizeof(struct usb_cdc_line_coding))
goto invalid;
value = w_length;
cdev->gadget->ep0->driver_data = port;
req->complete = port_complete_set_line_coding;
break;
/* GET_LINE_CODING ... return what host sent, or initial value */
case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
| USB_CDC_REQ_GET_LINE_CODING:
value = min_t(unsigned int, w_length,
sizeof(struct usb_cdc_line_coding));
memcpy(req->buf, &port->port_usb.port_line_coding, value);
break;
case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
| USB_CDC_REQ_SET_CONTROL_LINE_STATE:
value = 0;
port->port_usb.port_handshake_bits = w_value;
pr_debug("USB_CDC_REQ_SET_CONTROL_LINE_STATE: DTR:%d RST:%d\n",
w_value & ACM_CTRL_DTR ? 1 : 0,
w_value & ACM_CTRL_RTS ? 1 : 0);
if (port->port_usb.notify_modem)
port->port_usb.notify_modem(port, w_value);
break;
default:
invalid:
dev_dbg(&cdev->gadget->dev,
"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) {
dev_dbg(&cdev->gadget->dev,
"port(%s) req%02x.%02x v%04x i%04x l%d\n",
port->name, ctrl->bRequestType, ctrl->bRequest,
w_value, w_index, w_length);
req->zero = 0;
req->length = value;
value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
if (value < 0)
pr_err("port response on (%s), err %d\n",
port->name, value);
}
/* device either stalls (value < 0) or reports success */
return value;
}
static int usb_cser_set_alt(struct usb_function *f, unsigned int intf,
unsigned int alt)
{
struct f_cdev *port = func_to_port(f);
struct usb_composite_dev *cdev = f->config->cdev;
int rc = 0;
if (port->port_usb.notify->driver_data) {
dev_dbg(&cdev->gadget->dev,
"reset port(%s)\n", port->name);
usb_ep_disable(port->port_usb.notify);
}
if (!port->port_usb.notify->desc) {
if (config_ep_by_speed(cdev->gadget, f,
port->port_usb.notify)) {
port->port_usb.notify->desc = NULL;
return -EINVAL;
}
}
rc = usb_ep_enable(port->port_usb.notify);
if (rc) {
dev_err(&cdev->gadget->dev, "can't enable %s, result %d\n",
port->port_usb.notify->name, rc);
return rc;
}
port->port_usb.notify->driver_data = port;
if (port->port_usb.in->driver_data) {
dev_dbg(&cdev->gadget->dev,
"reset port(%s)\n", port->name);
usb_cser_disconnect(port);
}
if (!port->port_usb.in->desc || !port->port_usb.out->desc) {
dev_dbg(&cdev->gadget->dev,
"activate port(%s)\n", port->name);
if (config_ep_by_speed(cdev->gadget, f, port->port_usb.in) ||
config_ep_by_speed(cdev->gadget, f,
port->port_usb.out)) {
port->port_usb.in->desc = NULL;
port->port_usb.out->desc = NULL;
return -EINVAL;
}
}
usb_cser_connect(port);
return rc;
}
static void usb_cser_disable(struct usb_function *f)
{
struct f_cdev *port = func_to_port(f);
struct usb_composite_dev *cdev = f->config->cdev;
dev_dbg(&cdev->gadget->dev,
"port(%s) deactivated\n", port->name);
usb_cser_disconnect(port);
usb_ep_disable(port->port_usb.notify);
port->port_usb.notify->driver_data = NULL;
}
static int usb_cser_notify(struct f_cdev *port, u8 type, u16 value,
void *data, unsigned int length)
{
struct usb_ep *ep = port->port_usb.notify;
struct usb_request *req;
struct usb_cdc_notification *notify;
const unsigned int len = sizeof(*notify) + length;
void *buf;
int status;
unsigned long flags;
spin_lock_irqsave(&port->port_lock, flags);
if (!port->is_connected) {
spin_unlock_irqrestore(&port->port_lock, flags);
pr_debug("%s: port disconnected\n", __func__);
return -ENODEV;
}
req = port->port_usb.notify_req;
req->length = len;
notify = req->buf;
buf = notify + 1;
notify->bmRequestType = USB_DIR_IN | USB_TYPE_CLASS
| USB_RECIP_INTERFACE;
notify->bNotificationType = type;
notify->wValue = cpu_to_le16(value);
notify->wIndex = cpu_to_le16(port->port_usb.data_id);
notify->wLength = cpu_to_le16(length);
/* 2 byte data copy */
memcpy(buf, data, length);
spin_unlock_irqrestore(&port->port_lock, flags);
status = usb_ep_queue(ep, req, GFP_ATOMIC);
if (status < 0) {
pr_err("port %s can't notify serial state, %d\n",
port->name, status);
spin_lock_irqsave(&port->port_lock, flags);
port->port_usb.pending = false;
spin_unlock_irqrestore(&port->port_lock, flags);
}
return status;
}
static int port_notify_serial_state(struct cserial *cser)
{
struct f_cdev *port = cser_to_port(cser);
int status;
unsigned long flags;
struct usb_composite_dev *cdev = port->port_usb.func.config->cdev;
spin_lock_irqsave(&port->port_lock, flags);
if (!port->port_usb.pending) {
port->port_usb.pending = true;
spin_unlock_irqrestore(&port->port_lock, flags);
dev_dbg(&cdev->gadget->dev, "port %d serial state %04x\n",
port->port_num, port->port_usb.serial_state);
status = usb_cser_notify(port, USB_CDC_NOTIFY_SERIAL_STATE,
0, &port->port_usb.serial_state,
sizeof(port->port_usb.serial_state));
spin_lock_irqsave(&port->port_lock, flags);
} else {
port->port_usb.q_again = true;
status = 0;
}
spin_unlock_irqrestore(&port->port_lock, flags);
return status;
}
static void usb_cser_notify_complete(struct usb_ep *ep, struct usb_request *req)
{
struct f_cdev *port = req->context;
unsigned long flags;
spin_lock_irqsave(&port->port_lock, flags);
port->port_usb.pending = false;
if (req->status != -ESHUTDOWN && port->port_usb.q_again) {
port->port_usb.q_again = false;
spin_unlock_irqrestore(&port->port_lock, flags);
port_notify_serial_state(&port->port_usb);
spin_lock_irqsave(&port->port_lock, flags);
}
spin_unlock_irqrestore(&port->port_lock, flags);
}
static void dun_cser_connect(struct cserial *cser)
{
cser->serial_state |= ACM_CTRL_DSR | ACM_CTRL_DCD;
port_notify_serial_state(cser);
}
unsigned int dun_cser_get_dtr(struct cserial *cser)
{
if (cser->port_handshake_bits & ACM_CTRL_DTR)
return 1;
else
return 0;
}
unsigned int dun_cser_get_rts(struct cserial *cser)
{
if (cser->port_handshake_bits & ACM_CTRL_RTS)
return 1;
else
return 0;
}
unsigned int dun_cser_send_carrier_detect(struct cserial *cser,
unsigned int yes)
{
u16 state;
state = cser->serial_state;
state &= ~ACM_CTRL_DCD;
if (yes)
state |= ACM_CTRL_DCD;
cser->serial_state = state;
return port_notify_serial_state(cser);
}
unsigned int dun_cser_send_ring_indicator(struct cserial *cser,
unsigned int yes)
{
u16 state;
state = cser->serial_state;
state &= ~ACM_CTRL_RI;
if (yes)
state |= ACM_CTRL_RI;
cser->serial_state = state;
return port_notify_serial_state(cser);
}
static void dun_cser_disconnect(struct cserial *cser)
{
cser->serial_state &= ~(ACM_CTRL_DSR | ACM_CTRL_DCD);
port_notify_serial_state(cser);
}
static int dun_cser_send_break(struct cserial *cser, int duration)
{
u16 state;
state = cser->serial_state;
state &= ~ACM_CTRL_BRK;
if (duration)
state |= ACM_CTRL_BRK;
cser->serial_state = state;
return port_notify_serial_state(cser);
}
static int dun_cser_send_ctrl_bits(struct cserial *cser, int ctrl_bits)
{
cser->serial_state = ctrl_bits;
return port_notify_serial_state(cser);
}
static void usb_cser_free_req(struct usb_ep *ep, struct usb_request *req)
{
if (req) {
kfree(req->buf);
usb_ep_free_request(ep, req);
req = NULL;
}
}
static void usb_cser_free_requests(struct usb_ep *ep, struct list_head *head)
{
struct usb_request *req;
while (!list_empty(head)) {
req = list_entry(head->next, struct usb_request, list);
list_del_init(&req->list);
usb_cser_free_req(ep, req);
}
}
static struct usb_request *
usb_cser_alloc_req(struct usb_ep *ep, unsigned int len, size_t extra_sz,
gfp_t flags)
{
struct usb_request *req;
req = usb_ep_alloc_request(ep, flags);
if (!req) {
pr_err("usb alloc request failed\n");
return 0;
}
req->length = len;
req->buf = kmalloc(len + extra_sz, flags);
if (!req->buf) {
pr_err("request buf allocation failed\n");
usb_ep_free_request(ep, req);
return 0;
}
return req;
}
static int usb_cser_bind(struct usb_configuration *c, struct usb_function *f)
{
struct usb_composite_dev *cdev = c->cdev;
struct f_cdev *port = func_to_port(f);
int status;
struct usb_ep *ep;
if (cser_string_defs[0].id == 0) {
status = usb_string_id(c->cdev);
if (status < 0)
return status;
cser_string_defs[0].id = status;
}
status = usb_interface_id(c, f);
if (status < 0)
goto fail;
port->port_usb.data_id = status;
cser_interface_desc.bInterfaceNumber = status;
status = -ENODEV;
ep = usb_ep_autoconfig(cdev->gadget, &cser_fs_in_desc);
if (!ep)
goto fail;
port->port_usb.in = ep;
ep->driver_data = cdev;
ep = usb_ep_autoconfig(cdev->gadget, &cser_fs_out_desc);
if (!ep)
goto fail;
port->port_usb.out = ep;
ep->driver_data = cdev;
ep = usb_ep_autoconfig(cdev->gadget, &cser_fs_notify_desc);
if (!ep)
goto fail;
port->port_usb.notify = ep;
ep->driver_data = cdev;
/* allocate notification */
port->port_usb.notify_req = usb_cser_alloc_req(ep,
sizeof(struct usb_cdc_notification) + 2,
cdev->gadget->extra_buf_alloc, GFP_KERNEL);
if (!port->port_usb.notify_req)
goto fail;
port->port_usb.notify_req->complete = usb_cser_notify_complete;
port->port_usb.notify_req->context = port;
cser_hs_in_desc.bEndpointAddress = cser_fs_in_desc.bEndpointAddress;
cser_hs_out_desc.bEndpointAddress = cser_fs_out_desc.bEndpointAddress;
cser_ss_in_desc.bEndpointAddress = cser_fs_in_desc.bEndpointAddress;
cser_ss_out_desc.bEndpointAddress = cser_fs_out_desc.bEndpointAddress;
if (gadget_is_dualspeed(c->cdev->gadget)) {
cser_hs_notify_desc.bEndpointAddress =
cser_fs_notify_desc.bEndpointAddress;
}
if (gadget_is_superspeed(c->cdev->gadget)) {
cser_ss_notify_desc.bEndpointAddress =
cser_fs_notify_desc.bEndpointAddress;
}
status = usb_assign_descriptors(f, cser_fs_function, cser_hs_function,
cser_ss_function, NULL);
if (status)
goto fail;
dev_dbg(&cdev->gadget->dev, "usb serial port(%d): %s speed IN/%s OUT/%s\n",
port->port_num,
gadget_is_superspeed(c->cdev->gadget) ? "super" :
gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
port->port_usb.in->name, port->port_usb.out->name);
return 0;
fail:
if (port->port_usb.notify_req)
usb_cser_free_req(port->port_usb.notify,
port->port_usb.notify_req);
if (port->port_usb.notify)
port->port_usb.notify->driver_data = NULL;
if (port->port_usb.out)
port->port_usb.out->driver_data = NULL;
if (port->port_usb.in)
port->port_usb.in->driver_data = NULL;
pr_err("%s: can't bind, err %d\n", f->name, status);
return status;
}
static void cser_free_inst(struct usb_function_instance *fi)
{
struct f_cdev_opts *opts;
opts = container_of(fi, struct f_cdev_opts, func_inst);
if (opts->port) {
device_destroy(fcdev_classp, MKDEV(major, opts->port->minor));
cdev_del(&opts->port->fcdev_cdev);
}
usb_cser_chardev_deinit();
kfree(opts->func_name);
kfree(opts->port);
kfree(opts);
}
static void usb_cser_unbind(struct usb_configuration *c, struct usb_function *f)
{
struct f_cdev *port = func_to_port(f);
usb_free_all_descriptors(f);
usb_cser_free_req(port->port_usb.notify, port->port_usb.notify_req);
}
static int usb_cser_alloc_requests(struct usb_ep *ep, struct list_head *head,
int num, int size, size_t extra_sz,
void (*cb)(struct usb_ep *ep, struct usb_request *))
{
int i;
struct usb_request *req;
pr_debug("ep:%pK head:%p num:%d size:%d cb:%p",
ep, head, num, size, cb);
for (i = 0; i < num; i++) {
req = usb_cser_alloc_req(ep, size, extra_sz, GFP_ATOMIC);
if (!req) {
pr_debug("req allocated:%d\n", i);
return list_empty(head) ? -ENOMEM : 0;
}
req->complete = cb;
list_add_tail(&req->list, head);
}
return 0;
}
static void usb_cser_start_rx(struct f_cdev *port)
{
struct list_head *pool;
struct usb_ep *ep;
unsigned long flags;
int ret;
pr_debug("start RX(USB OUT)\n");
if (!port) {
pr_err("port is null\n");
return;
}
spin_lock_irqsave(&port->port_lock, flags);
if (!(port->is_connected && port->port_open)) {
spin_unlock_irqrestore(&port->port_lock, flags);
pr_debug("can't start rx.\n");
return;
}
pool = &port->read_pool;
ep = port->port_usb.out;
while (!list_empty(pool)) {
struct usb_request *req;
req = list_entry(pool->next, struct usb_request, list);
list_del_init(&req->list);
req->length = BRIDGE_RX_BUF_SIZE;
req->complete = usb_cser_read_complete;
spin_unlock_irqrestore(&port->port_lock, flags);
ret = usb_ep_queue(ep, req, GFP_KERNEL);
spin_lock_irqsave(&port->port_lock, flags);
if (ret) {
pr_err("port(%d):%pK usb ep(%s) queue failed\n",
port->port_num, port, ep->name);
list_add(&req->list, pool);
break;
}
}
spin_unlock_irqrestore(&port->port_lock, flags);
}
static void usb_cser_read_complete(struct usb_ep *ep, struct usb_request *req)
{
struct f_cdev *port = ep->driver_data;
unsigned long flags;
pr_debug("ep:(%pK)(%s) port:%p req_status:%d req->actual:%u\n",
ep, ep->name, port, req->status, req->actual);
if (!port) {
pr_err("port is null\n");
return;
}
spin_lock_irqsave(&port->port_lock, flags);
if (!port->port_open || req->status || !req->actual) {
list_add_tail(&req->list, &port->read_pool);
spin_unlock_irqrestore(&port->port_lock, flags);
return;
}
port->nbytes_from_host += req->actual;
list_add_tail(&req->list, &port->read_queued);
spin_unlock_irqrestore(&port->port_lock, flags);
wake_up(&port->read_wq);
}
static void usb_cser_write_complete(struct usb_ep *ep, struct usb_request *req)
{
unsigned long flags;
struct f_cdev *port = ep->driver_data;
pr_debug("ep:(%pK)(%s) port:%p req_stats:%d\n",
ep, ep->name, port, req->status);
if (!port) {
pr_err("port is null\n");
return;
}
spin_lock_irqsave(&port->port_lock, flags);
port->nbytes_to_host += req->actual;
list_add_tail(&req->list, &port->write_pool);
spin_unlock_irqrestore(&port->port_lock, flags);
switch (req->status) {
default:
pr_debug("unexpected %s status %d\n", ep->name, req->status);
/* FALL THROUGH */
case 0:
/* normal completion */
break;
case -ESHUTDOWN:
/* disconnect */
pr_debug("%s shutdown\n", ep->name);
break;
}
}
static void usb_cser_start_io(struct f_cdev *port)
{
struct usb_function *f = &port->port_usb.func;
struct usb_composite_dev *cdev = f->config->cdev;
int ret = -ENODEV;
unsigned long flags;
pr_debug("port: %pK\n", port);
spin_lock_irqsave(&port->port_lock, flags);
if (!port->is_connected)
goto start_io_out;
port->current_rx_req = NULL;
port->pending_rx_bytes = 0;
port->current_rx_buf = NULL;
ret = usb_cser_alloc_requests(port->port_usb.out,
&port->read_pool,
BRIDGE_RX_QUEUE_SIZE, BRIDGE_RX_BUF_SIZE, 0,
usb_cser_read_complete);
if (ret) {
pr_err("unable to allocate out requests\n");
goto start_io_out;
}
ret = usb_cser_alloc_requests(port->port_usb.in,
&port->write_pool,
BRIDGE_TX_QUEUE_SIZE, BRIDGE_TX_BUF_SIZE,
cdev->gadget->extra_buf_alloc,
usb_cser_write_complete);
if (ret) {
usb_cser_free_requests(port->port_usb.out, &port->read_pool);
pr_err("unable to allocate IN requests\n");
goto start_io_out;
}
start_io_out:
spin_unlock_irqrestore(&port->port_lock, flags);
if (ret)
return;
usb_cser_start_rx(port);
}
static void usb_cser_stop_io(struct f_cdev *port)
{
struct usb_ep *in;
struct usb_ep *out;
unsigned long flags;
pr_debug("port:%pK\n", port);
in = port->port_usb.in;
out = port->port_usb.out;
/* disable endpoints, aborting down any active I/O */
usb_ep_disable(out);
out->driver_data = NULL;
usb_ep_disable(in);
in->driver_data = NULL;
spin_lock_irqsave(&port->port_lock, flags);
if (port->current_rx_req != NULL) {
kfree(port->current_rx_req->buf);
usb_ep_free_request(out, port->current_rx_req);
}
port->pending_rx_bytes = 0;
port->current_rx_buf = NULL;
usb_cser_free_requests(out, &port->read_queued);
usb_cser_free_requests(out, &port->read_pool);
usb_cser_free_requests(in, &port->write_pool);
spin_unlock_irqrestore(&port->port_lock, flags);
}
int f_cdev_open(struct inode *inode, struct file *file)
{
int ret;
unsigned long flags;
struct f_cdev *port;
port = container_of(inode->i_cdev, struct f_cdev, fcdev_cdev);
if (!port) {
pr_err("Port is NULL.\n");
return -EINVAL;
}
if (port && port->port_open) {
pr_err("port is already opened.\n");
return -EBUSY;
}
file->private_data = port;
pr_debug("opening port(%s)(%pK)\n", port->name, port);
ret = wait_event_interruptible(port->open_wq,
port->is_connected);
if (ret) {
pr_debug("open interrupted.\n");
return ret;
}
spin_lock_irqsave(&port->port_lock, flags);
port->port_open = true;
spin_unlock_irqrestore(&port->port_lock, flags);
usb_cser_start_rx(port);
pr_debug("port(%s)(%pK) open is success\n", port->name, port);
return 0;
}
int f_cdev_release(struct inode *inode, struct file *file)
{
unsigned long flags;
struct f_cdev *port;
port = file->private_data;
if (!port) {
pr_err("port is NULL.\n");
return -EINVAL;
}
spin_lock_irqsave(&port->port_lock, flags);
port->port_open = false;
port->cbits_updated = false;
spin_unlock_irqrestore(&port->port_lock, flags);
pr_debug("port(%s)(%pK) is closed.\n", port->name, port);
return 0;
}
ssize_t f_cdev_read(struct file *file,
char __user *buf,
size_t count,
loff_t *ppos)
{
unsigned long flags;
struct f_cdev *port;
struct usb_request *req;
struct list_head *pool;
struct usb_request *current_rx_req;
size_t pending_rx_bytes, bytes_copied = 0, size;
u8 *current_rx_buf;
port = file->private_data;
if (!port) {
pr_err("port is NULL.\n");
return -EINVAL;
}
pr_debug("read on port(%s)(%pK) count:%zu\n", port->name, port, count);
spin_lock_irqsave(&port->port_lock, flags);
current_rx_req = port->current_rx_req;
pending_rx_bytes = port->pending_rx_bytes;
current_rx_buf = port->current_rx_buf;
port->current_rx_req = NULL;
port->current_rx_buf = NULL;
port->pending_rx_bytes = 0;
bytes_copied = 0;
if (list_empty(&port->read_queued) && !pending_rx_bytes) {
spin_unlock_irqrestore(&port->port_lock, flags);
pr_debug("%s(): read_queued list is empty.\n", __func__);
goto start_rx;
}
/*
* Consider below cases:
* 1. If available read buffer size (i.e. count value) is greater than
* available data as part of one USB OUT request buffer, then consider
* copying multiple USB OUT request buffers until read buffer is filled.
* 2. If available read buffer size (i.e. count value) is smaller than
* available data as part of one USB OUT request buffer, then copy this
* buffer data across multiple read() call until whole USB OUT request
* buffer is copied.
*/
while ((pending_rx_bytes || !list_empty(&port->read_queued)) && count) {
if (pending_rx_bytes == 0) {
pool = &port->read_queued;
req = list_first_entry(pool, struct usb_request, list);
list_del_init(&req->list);
current_rx_req = req;
pending_rx_bytes = req->actual;
current_rx_buf = req->buf;
}
spin_unlock_irqrestore(&port->port_lock, flags);
size = count;
if (size > pending_rx_bytes)
size = pending_rx_bytes;
pr_debug("pending_rx_bytes:%zu count:%zu size:%zu\n",
pending_rx_bytes, count, size);
size -= copy_to_user(buf, current_rx_buf, size);
port->nbytes_to_port_bridge += size;
bytes_copied += size;
count -= size;
buf += size;
spin_lock_irqsave(&port->port_lock, flags);
if (!port->is_connected) {
list_add_tail(&current_rx_req->list, &port->read_pool);
spin_unlock_irqrestore(&port->port_lock, flags);
return -EAGAIN;
}
/*
* partial data available, then update pending_rx_bytes,
* otherwise add USB request back to read_pool for next data.
*/
if (size < pending_rx_bytes) {
pending_rx_bytes -= size;
current_rx_buf += size;
} else {
list_add_tail(&current_rx_req->list, &port->read_pool);
pending_rx_bytes = 0;
current_rx_req = NULL;
current_rx_buf = NULL;
}
}
port->pending_rx_bytes = pending_rx_bytes;
port->current_rx_buf = current_rx_buf;
port->current_rx_req = current_rx_req;
spin_unlock_irqrestore(&port->port_lock, flags);
start_rx:
usb_cser_start_rx(port);
return bytes_copied;
}
ssize_t f_cdev_write(struct file *file,
const char __user *buf,
size_t count,
loff_t *ppos)
{
int ret;
unsigned long flags;
struct f_cdev *port;
struct usb_request *req;
struct list_head *pool;
unsigned int xfer_size;
struct usb_ep *in;
port = file->private_data;
if (!port) {
pr_err("port is NULL.\n");
return -EINVAL;
}
spin_lock_irqsave(&port->port_lock, flags);
pr_debug("write on port(%s)(%pK)\n", port->name, port);
if (!port->is_connected) {
spin_unlock_irqrestore(&port->port_lock, flags);
pr_err("%s: cable is disconnected.\n", __func__);
return -ENODEV;
}
if (list_empty(&port->write_pool)) {
spin_unlock_irqrestore(&port->port_lock, flags);
pr_debug("%s: Request list is empty.\n", __func__);
return 0;
}
in = port->port_usb.in;
pool = &port->write_pool;
req = list_first_entry(pool, struct usb_request, list);
list_del_init(&req->list);
spin_unlock_irqrestore(&port->port_lock, flags);
pr_debug("%s: write buf size:%zu\n", __func__, count);
if (count > BRIDGE_TX_BUF_SIZE)
xfer_size = BRIDGE_TX_BUF_SIZE;
else
xfer_size = count;
ret = copy_from_user(req->buf, buf, xfer_size);
if (ret) {
pr_err("copy_from_user failed: err %d\n", ret);
ret = -EFAULT;
} else {
req->length = xfer_size;
req->zero = 1;
ret = usb_ep_queue(in, req, GFP_KERNEL);
if (ret) {
pr_err("EP QUEUE failed:%d\n", ret);
ret = -EIO;
goto err_exit;
}
spin_lock_irqsave(&port->port_lock, flags);
port->nbytes_from_port_bridge += req->length;
spin_unlock_irqrestore(&port->port_lock, flags);
}
err_exit:
if (ret) {
spin_lock_irqsave(&port->port_lock, flags);
/* USB cable is connected, add it back otherwise free request */
if (port->is_connected)
list_add(&req->list, &port->write_pool);
else
usb_cser_free_req(in, req);
spin_unlock_irqrestore(&port->port_lock, flags);
return ret;
}
return xfer_size;
}
static unsigned int f_cdev_poll(struct file *file, poll_table *wait)
{
unsigned int mask = 0;
struct f_cdev *port;
unsigned long flags;
port = file->private_data;
if (port && port->is_connected) {
poll_wait(file, &port->read_wq, wait);
spin_lock_irqsave(&port->port_lock, flags);
if (!list_empty(&port->read_queued)) {
mask |= POLLIN | POLLRDNORM;
pr_debug("sets POLLIN for %s\n", port->name);
}
if (port->cbits_updated) {
mask |= POLLPRI;
pr_debug("sets POLLPRI for %s\n", port->name);
}
spin_unlock_irqrestore(&port->port_lock, flags);
} else {
pr_err("Failed due to NULL device or disconnected.\n");
mask = POLLERR;
}
return mask;
}
static int f_cdev_tiocmget(struct f_cdev *port)
{
struct cserial *cser;
unsigned int result = 0;
if (!port) {
pr_err("port is NULL.\n");
return -ENODEV;
}
cser = &port->port_usb;
if (cser->get_dtr)
result |= (cser->get_dtr(cser) ? TIOCM_DTR : 0);
if (cser->get_rts)
result |= (cser->get_rts(cser) ? TIOCM_RTS : 0);
if (cser->serial_state & TIOCM_CD)
result |= TIOCM_CD;
if (cser->serial_state & TIOCM_RI)
result |= TIOCM_RI;
return result;
}
static int f_cdev_tiocmset(struct f_cdev *port,
unsigned int set, unsigned int clear)
{
struct cserial *cser;
int status = 0;
if (!port) {
pr_err("port is NULL.\n");
return -ENODEV;
}
cser = &port->port_usb;
if (set & TIOCM_RI) {
if (cser->send_ring_indicator) {
cser->serial_state |= TIOCM_RI;
status = cser->send_ring_indicator(cser, 1);
}
}
if (clear & TIOCM_RI) {
if (cser->send_ring_indicator) {
cser->serial_state &= ~TIOCM_RI;
status = cser->send_ring_indicator(cser, 0);
}
}
if (set & TIOCM_CD) {
if (cser->send_carrier_detect) {
cser->serial_state |= TIOCM_CD;
status = cser->send_carrier_detect(cser, 1);
}
}
if (clear & TIOCM_CD) {
if (cser->send_carrier_detect) {
cser->serial_state &= ~TIOCM_CD;
status = cser->send_carrier_detect(cser, 0);
}
}
return status;
}
static long f_cdev_ioctl(struct file *fp, unsigned int cmd,
unsigned long arg)
{
long ret = 0;
int i = 0;
uint32_t val;
struct f_cdev *port;
port = fp->private_data;
if (!port) {
pr_err("port is null.\n");
return POLLERR;
}
switch (cmd) {
case TIOCMBIC:
case TIOCMBIS:
case TIOCMSET:
pr_debug("TIOCMSET on port(%s)%pK\n", port->name, port);
i = get_user(val, (uint32_t *)arg);
if (i) {
pr_err("Error getting TIOCMSET value\n");
return i;
}
ret = f_cdev_tiocmset(port, val, ~val);
break;
case TIOCMGET:
pr_debug("TIOCMGET on port(%s)%pK\n", port->name, port);
ret = f_cdev_tiocmget(port);
if (ret >= 0) {
ret = put_user(ret, (uint32_t *)arg);
port->cbits_updated = false;
}
break;
default:
pr_err("Received cmd:%d not supported\n", cmd);
ret = -ENOIOCTLCMD;
break;
}
return ret;
}
static void usb_cser_notify_modem(void *fport, int ctrl_bits)
{
int temp;
struct f_cdev *port = fport;
if (!port) {
pr_err("port is null\n");
return;
}
pr_debug("port(%s): ctrl_bits:%x\n", port->name, ctrl_bits);
temp = convert_acm_sigs_to_uart(ctrl_bits);
if (temp == port->cbits_to_modem)
return;
port->cbits_to_modem = temp;
port->cbits_updated = true;
wake_up(&port->read_wq);
}
int usb_cser_connect(struct f_cdev *port)
{
unsigned long flags;
int ret;
struct cserial *cser;
if (!port) {
pr_err("port is NULL.\n");
return -ENODEV;
}
pr_debug("port(%s) (%pK)\n", port->name, port);
cser = &port->port_usb;
cser->notify_modem = usb_cser_notify_modem;
ret = usb_ep_enable(cser->in);
if (ret) {
pr_err("usb_ep_enable failed eptype:IN ep:%pK, err:%d",
cser->in, ret);
return ret;
}
cser->in->driver_data = port;
ret = usb_ep_enable(cser->out);
if (ret) {
pr_err("usb_ep_enable failed eptype:OUT ep:%pK, err: %d",
cser->out, ret);
cser->in->driver_data = 0;
return ret;
}
cser->out->driver_data = port;
spin_lock_irqsave(&port->port_lock, flags);
cser->pending = false;
cser->q_again = false;
port->is_connected = true;
spin_unlock_irqrestore(&port->port_lock, flags);
usb_cser_start_io(port);
wake_up(&port->open_wq);
return 0;
}
void usb_cser_disconnect(struct f_cdev *port)
{
unsigned long flags;
usb_cser_stop_io(port);
/* lower DTR to modem */
usb_cser_notify_modem(port, 0);
spin_lock_irqsave(&port->port_lock, flags);
port->is_connected = false;
port->nbytes_from_host = port->nbytes_to_host = 0;
port->nbytes_to_port_bridge = 0;
spin_unlock_irqrestore(&port->port_lock, flags);
}
static const struct file_operations f_cdev_fops = {
.owner = THIS_MODULE,
.open = f_cdev_open,
.release = f_cdev_release,
.read = f_cdev_read,
.write = f_cdev_write,
.poll = f_cdev_poll,
.unlocked_ioctl = f_cdev_ioctl,
.compat_ioctl = f_cdev_ioctl,
};
static struct f_cdev *f_cdev_alloc(char *func_name, int portno)
{
int ret;
dev_t dev;
struct device *device;
struct f_cdev *port;
port = kzalloc(sizeof(struct f_cdev), GFP_KERNEL);
if (!port) {
ret = -ENOMEM;
return ERR_PTR(ret);
}
mutex_lock(&chardev_ida_lock);
if (idr_is_empty(&chardev_ida.idr)) {
ret = usb_cser_alloc_chardev_region();
if (ret) {
mutex_unlock(&chardev_ida_lock);
pr_err("alloc chardev failed\n");
goto err_alloc_chardev;
}
}
ret = ida_simple_get(&chardev_ida, 0, 0, GFP_KERNEL);
if (ret >= NUM_INSTANCE) {
ida_simple_remove(&chardev_ida, ret);
mutex_unlock(&chardev_ida_lock);
ret = -ENODEV;
goto err_get_ida;
}
port->port_num = portno;
port->minor = ret;
mutex_unlock(&chardev_ida_lock);
snprintf(port->name, sizeof(port->name), "%s%d", DEVICE_NAME, portno);
spin_lock_init(&port->port_lock);
init_waitqueue_head(&port->open_wq);
init_waitqueue_head(&port->read_wq);
INIT_LIST_HEAD(&port->read_pool);
INIT_LIST_HEAD(&port->read_queued);
INIT_LIST_HEAD(&port->write_pool);
port->fcdev_wq = create_singlethread_workqueue(port->name);
if (!port->fcdev_wq) {
pr_err("Unable to create workqueue fcdev_wq for port:%s\n",
port->name);
ret = -ENOMEM;
goto err_get_ida;
}
/* create char device */
cdev_init(&port->fcdev_cdev, &f_cdev_fops);
dev = MKDEV(major, port->minor);
ret = cdev_add(&port->fcdev_cdev, dev, 1);
if (ret) {
pr_err("Failed to add cdev for port(%s)\n", port->name);
goto err_cdev_add;
}
device = device_create(fcdev_classp, NULL, dev, NULL, port->name);
if (IS_ERR(device)) {
ret = PTR_ERR(device);
goto err_create_dev;
}
pr_info("port_name:%s (%pK) portno:(%d)\n",
port->name, port, port->port_num);
return port;
err_create_dev:
cdev_del(&port->fcdev_cdev);
err_cdev_add:
destroy_workqueue(port->fcdev_wq);
err_get_ida:
usb_cser_chardev_deinit();
err_alloc_chardev:
kfree(port);
return ERR_PTR(ret);
}
static void usb_cser_chardev_deinit(void)
{
if (idr_is_empty(&chardev_ida.idr)) {
if (major) {
unregister_chrdev_region(MKDEV(major, 0), minors);
major = minors = 0;
}
if (!IS_ERR_OR_NULL(fcdev_classp))
class_destroy(fcdev_classp);
}
}
static int usb_cser_alloc_chardev_region(void)
{
int ret;
dev_t dev;
ret = alloc_chrdev_region(&dev,
0,
NUM_INSTANCE,
MODULE_NAME);
if (ret) {
pr_err("alloc_chrdev_region() failed ret:%i\n", ret);
return ret;
}
major = MAJOR(dev);
minors = NUM_INSTANCE;
fcdev_classp = class_create(THIS_MODULE, MODULE_NAME);
if (IS_ERR(fcdev_classp)) {
pr_err("class_create() failed ENOMEM\n");
ret = -ENOMEM;
}
return 0;
}
static inline struct f_cdev_opts *to_f_cdev_opts(struct config_item *item)
{
return container_of(to_config_group(item), struct f_cdev_opts,
func_inst.group);
}
static struct f_cdev_opts *to_fi_cdev_opts(struct usb_function_instance *fi)
{
return container_of(fi, struct f_cdev_opts, func_inst);
}
static void cserial_attr_release(struct config_item *item)
{
struct f_cdev_opts *opts = to_f_cdev_opts(item);
usb_put_function_instance(&opts->func_inst);
}
static struct configfs_item_operations cserial_item_ops = {
.release = cserial_attr_release,
};
static ssize_t usb_cser_status_show(struct config_item *item, char *page)
{
struct f_cdev *port = to_f_cdev_opts(item)->port;
char *buf;
unsigned long flags;
int temp = 0;
int ret;
buf = kzalloc(sizeof(char) * 512, GFP_KERNEL);
if (!buf)
return -ENOMEM;
spin_lock_irqsave(&port->port_lock, flags);
temp += scnprintf(buf + temp, 512 - temp,
"###PORT:%s###\n"
"port_no:%d\n"
"func:%s\n"
"nbytes_to_host: %lu\n"
"nbytes_from_host: %lu\n"
"nbytes_to_port_bridge: %lu\n"
"nbytes_from_port_bridge: %lu\n"
"cbits_to_modem: %u\n"
"Port Opened: %s\n",
port->name,
port->port_num,
to_f_cdev_opts(item)->func_name,
port->nbytes_to_host,
port->nbytes_from_host,
port->nbytes_to_port_bridge,
port->nbytes_from_port_bridge,
port->cbits_to_modem,
(port->port_open ? "Opened" : "Closed"));
spin_unlock_irqrestore(&port->port_lock, flags);
ret = scnprintf(page, temp, buf);
kfree(buf);
return ret;
}
static ssize_t usb_cser_status_store(struct config_item *item,
const char *page, size_t len)
{
struct f_cdev *port = to_f_cdev_opts(item)->port;
unsigned long flags;
u8 stats;
if (page == NULL) {
pr_err("Invalid buffer");
return len;
}
if (kstrtou8(page, 0, &stats) != 0 || stats != 0) {
pr_err("(%u)Wrong value. enter 0 to clear.\n", stats);
return len;
}
spin_lock_irqsave(&port->port_lock, flags);
port->nbytes_to_host = port->nbytes_from_host = 0;
port->nbytes_to_port_bridge = port->nbytes_from_port_bridge = 0;
spin_unlock_irqrestore(&port->port_lock, flags);
return len;
}
CONFIGFS_ATTR(usb_cser_, status);
static struct configfs_attribute *cserial_attrs[] = {
&usb_cser_attr_status,
NULL,
};
static struct config_item_type cserial_func_type = {
.ct_item_ops = &cserial_item_ops,
.ct_attrs = cserial_attrs,
.ct_owner = THIS_MODULE,
};
static int cser_set_inst_name(struct usb_function_instance *f, const char *name)
{
struct f_cdev_opts *opts =
container_of(f, struct f_cdev_opts, func_inst);
char *ptr, *str;
size_t name_len, str_size;
int ret;
struct f_cdev *port;
name_len = strlen(name) + 1;
if (name_len > MAX_CDEV_INST_NAME)
return -ENAMETOOLONG;
/* expect name as cdev.<func>.<port_num> */
str = strnchr(name, strlen(name), '.');
if (!str) {
pr_err("invalid input (%s)\n", name);
return -EINVAL;
}
/* get function name */
str_size = name_len - strlen(str);
if (str_size > MAX_CDEV_FUNC_NAME)
return -ENAMETOOLONG;
ptr = kstrndup(name, str_size - 1, GFP_KERNEL);
if (!ptr) {
pr_err("error:%ld\n", PTR_ERR(ptr));
return -ENOMEM;
}
opts->func_name = ptr;
/* get port number */
str = strrchr(name, '.');
if (!str) {
pr_err("err: port number not found\n");
return -EINVAL;
}
pr_debug("str:%s\n", str);
*str = '\0';
str++;
ret = kstrtou8(str, 0, &opts->port_num);
if (ret) {
pr_err("erro: not able to get port number\n");
return -EINVAL;
}
pr_debug("gser: port_num:%d func_name:%s\n",
opts->port_num, opts->func_name);
port = f_cdev_alloc(opts->func_name, opts->port_num);
if (IS_ERR(port)) {
pr_err("Failed to create cdev port(%d)\n", opts->port_num);
return -ENOMEM;
}
opts->port = port;
/* For DUN functionality only sets control signal handling */
if (!strcmp(opts->func_name, "dun")) {
port->port_usb.connect = dun_cser_connect;
port->port_usb.get_dtr = dun_cser_get_dtr;
port->port_usb.get_rts = dun_cser_get_rts;
port->port_usb.send_carrier_detect =
dun_cser_send_carrier_detect;
port->port_usb.send_ring_indicator =
dun_cser_send_ring_indicator;
port->port_usb.send_modem_ctrl_bits = dun_cser_send_ctrl_bits;
port->port_usb.disconnect = dun_cser_disconnect;
port->port_usb.send_break = dun_cser_send_break;
}
return 0;
}
static struct usb_function_instance *cser_alloc_inst(void)
{
struct f_cdev_opts *opts;
opts = kzalloc(sizeof(*opts), GFP_KERNEL);
if (!opts)
return ERR_PTR(-ENOMEM);
opts->func_inst.free_func_inst = cser_free_inst;
opts->func_inst.set_inst_name = cser_set_inst_name;
config_group_init_type_name(&opts->func_inst.group, "",
&cserial_func_type);
return &opts->func_inst;
}
static struct usb_function *cser_alloc(struct usb_function_instance *fi)
{
struct f_cdev_opts *opts = to_fi_cdev_opts(fi);
struct f_cdev *port = opts->port;
port->port_usb.func.name = "cser";
port->port_usb.func.strings = usb_cser_strings;
port->port_usb.func.bind = usb_cser_bind;
port->port_usb.func.unbind = usb_cser_unbind;
port->port_usb.func.set_alt = usb_cser_set_alt;
port->port_usb.func.disable = usb_cser_disable;
port->port_usb.func.setup = usb_cser_setup;
port->port_usb.func.free_func = usb_cser_free_func;
return &port->port_usb.func;
}
DECLARE_USB_FUNCTION_INIT(cser, cser_alloc_inst, cser_alloc);
MODULE_DESCRIPTION("USB Serial Character Driver");
MODULE_LICENSE("GPL v2");