| /* |
| * 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_uart_sigs_to_acm(unsigned int uart_sig) |
| { |
| unsigned int acm_sig = 0; |
| |
| /* should this needs to be in calling functions ??? */ |
| uart_sig &= (TIOCM_RI | TIOCM_CD | TIOCM_DSR); |
| |
| if (uart_sig & TIOCM_RI) |
| acm_sig |= ACM_CTRL_RI; |
| if (uart_sig & TIOCM_CD) |
| acm_sig |= ACM_CTRL_DCD; |
| if (uart_sig & TIOCM_DSR) |
| acm_sig |= ACM_CTRL_DSR; |
| |
| return acm_sig; |
| } |
| |
| 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(¤t_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(¤t_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; |
| |
| if (cser->serial_state & TIOCM_DSR) |
| result |= TIOCM_DSR; |
| 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); |
| } |
| } |
| |
| if (set & TIOCM_DSR) |
| cser->serial_state |= TIOCM_DSR; |
| |
| if (clear & TIOCM_DSR) |
| cser->serial_state &= ~TIOCM_DSR; |
| |
| 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; |
| struct cserial *cser; |
| |
| cser = &port->port_usb; |
| 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; |
| |
| /* if DTR is high, update latest modem info to laptop */ |
| if (port->cbits_to_modem & TIOCM_DTR) { |
| unsigned int result; |
| unsigned int cbits_to_laptop; |
| |
| result = f_cdev_tiocmget(port); |
| cbits_to_laptop = convert_uart_sigs_to_acm(result); |
| if (cser->send_modem_ctrl_bits) |
| cser->send_modem_ctrl_bits(cser, cbits_to_laptop); |
| } |
| |
| 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"); |