| // SPDX-License-Identifier: GPL-2.0+ |
| /** |
| * drivers/usb/class/usbtmc.c - USB Test & Measurement class driver |
| * |
| * Copyright (C) 2007 Stefan Kopp, Gechingen, Germany |
| * Copyright (C) 2008 Novell, Inc. |
| * Copyright (C) 2008 Greg Kroah-Hartman <gregkh@suse.de> |
| */ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include <linux/module.h> |
| #include <linux/kernel.h> |
| #include <linux/fs.h> |
| #include <linux/uaccess.h> |
| #include <linux/kref.h> |
| #include <linux/slab.h> |
| #include <linux/poll.h> |
| #include <linux/mutex.h> |
| #include <linux/usb.h> |
| #include <linux/compat.h> |
| #include <linux/usb/tmc.h> |
| |
| |
| #define USBTMC_HEADER_SIZE 12 |
| #define USBTMC_MINOR_BASE 176 |
| |
| /* |
| * Size of driver internal IO buffer. Must be multiple of 4 and at least as |
| * large as wMaxPacketSize (which is usually 512 bytes). |
| */ |
| #define USBTMC_SIZE_IOBUFFER 2048 |
| |
| /* Minimum USB timeout (in milliseconds) */ |
| #define USBTMC_MIN_TIMEOUT 100 |
| /* Default USB timeout (in milliseconds) */ |
| #define USBTMC_TIMEOUT 5000 |
| |
| /* |
| * Maximum number of read cycles to empty bulk in endpoint during CLEAR and |
| * ABORT_BULK_IN requests. Ends the loop if (for whatever reason) a short |
| * packet is never read. |
| */ |
| #define USBTMC_MAX_READS_TO_CLEAR_BULK_IN 100 |
| |
| static const struct usb_device_id usbtmc_devices[] = { |
| { USB_INTERFACE_INFO(USB_CLASS_APP_SPEC, 3, 0), }, |
| { USB_INTERFACE_INFO(USB_CLASS_APP_SPEC, 3, 1), }, |
| { 0, } /* terminating entry */ |
| }; |
| MODULE_DEVICE_TABLE(usb, usbtmc_devices); |
| |
| /* |
| * This structure is the capabilities for the device |
| * See section 4.2.1.8 of the USBTMC specification, |
| * and section 4.2.2 of the USBTMC usb488 subclass |
| * specification for details. |
| */ |
| struct usbtmc_dev_capabilities { |
| __u8 interface_capabilities; |
| __u8 device_capabilities; |
| __u8 usb488_interface_capabilities; |
| __u8 usb488_device_capabilities; |
| }; |
| |
| /* This structure holds private data for each USBTMC device. One copy is |
| * allocated for each USBTMC device in the driver's probe function. |
| */ |
| struct usbtmc_device_data { |
| const struct usb_device_id *id; |
| struct usb_device *usb_dev; |
| struct usb_interface *intf; |
| struct list_head file_list; |
| |
| unsigned int bulk_in; |
| unsigned int bulk_out; |
| |
| u8 bTag; |
| u8 bTag_last_write; /* needed for abort */ |
| u8 bTag_last_read; /* needed for abort */ |
| |
| /* data for interrupt in endpoint handling */ |
| u8 bNotify1; |
| u8 bNotify2; |
| u16 ifnum; |
| u8 iin_bTag; |
| u8 *iin_buffer; |
| atomic_t iin_data_valid; |
| unsigned int iin_ep; |
| int iin_ep_present; |
| int iin_interval; |
| struct urb *iin_urb; |
| u16 iin_wMaxPacketSize; |
| |
| /* coalesced usb488_caps from usbtmc_dev_capabilities */ |
| __u8 usb488_caps; |
| |
| /* attributes from the USB TMC spec for this device */ |
| u8 TermChar; |
| bool TermCharEnabled; |
| bool auto_abort; |
| |
| bool zombie; /* fd of disconnected device */ |
| |
| struct usbtmc_dev_capabilities capabilities; |
| struct kref kref; |
| struct mutex io_mutex; /* only one i/o function running at a time */ |
| wait_queue_head_t waitq; |
| struct fasync_struct *fasync; |
| spinlock_t dev_lock; /* lock for file_list */ |
| }; |
| #define to_usbtmc_data(d) container_of(d, struct usbtmc_device_data, kref) |
| |
| /* |
| * This structure holds private data for each USBTMC file handle. |
| */ |
| struct usbtmc_file_data { |
| struct usbtmc_device_data *data; |
| struct list_head file_elem; |
| |
| u32 timeout; |
| u8 srq_byte; |
| atomic_t srq_asserted; |
| u8 eom_val; |
| u8 term_char; |
| bool term_char_enabled; |
| }; |
| |
| /* Forward declarations */ |
| static struct usb_driver usbtmc_driver; |
| |
| static void usbtmc_delete(struct kref *kref) |
| { |
| struct usbtmc_device_data *data = to_usbtmc_data(kref); |
| |
| usb_put_dev(data->usb_dev); |
| kfree(data); |
| } |
| |
| static int usbtmc_open(struct inode *inode, struct file *filp) |
| { |
| struct usb_interface *intf; |
| struct usbtmc_device_data *data; |
| struct usbtmc_file_data *file_data; |
| |
| intf = usb_find_interface(&usbtmc_driver, iminor(inode)); |
| if (!intf) { |
| pr_err("can not find device for minor %d", iminor(inode)); |
| return -ENODEV; |
| } |
| |
| file_data = kzalloc(sizeof(*file_data), GFP_KERNEL); |
| if (!file_data) |
| return -ENOMEM; |
| |
| data = usb_get_intfdata(intf); |
| /* Protect reference to data from file structure until release */ |
| kref_get(&data->kref); |
| |
| mutex_lock(&data->io_mutex); |
| file_data->data = data; |
| |
| /* copy default values from device settings */ |
| file_data->timeout = USBTMC_TIMEOUT; |
| file_data->term_char = data->TermChar; |
| file_data->term_char_enabled = data->TermCharEnabled; |
| file_data->eom_val = 1; |
| |
| INIT_LIST_HEAD(&file_data->file_elem); |
| spin_lock_irq(&data->dev_lock); |
| list_add_tail(&file_data->file_elem, &data->file_list); |
| spin_unlock_irq(&data->dev_lock); |
| mutex_unlock(&data->io_mutex); |
| |
| /* Store pointer in file structure's private data field */ |
| filp->private_data = file_data; |
| |
| return 0; |
| } |
| |
| static int usbtmc_release(struct inode *inode, struct file *file) |
| { |
| struct usbtmc_file_data *file_data = file->private_data; |
| |
| /* prevent IO _AND_ usbtmc_interrupt */ |
| mutex_lock(&file_data->data->io_mutex); |
| spin_lock_irq(&file_data->data->dev_lock); |
| |
| list_del(&file_data->file_elem); |
| |
| spin_unlock_irq(&file_data->data->dev_lock); |
| mutex_unlock(&file_data->data->io_mutex); |
| |
| kref_put(&file_data->data->kref, usbtmc_delete); |
| file_data->data = NULL; |
| kfree(file_data); |
| return 0; |
| } |
| |
| static int usbtmc_ioctl_abort_bulk_in(struct usbtmc_device_data *data) |
| { |
| u8 *buffer; |
| struct device *dev; |
| int rv; |
| int n; |
| int actual; |
| struct usb_host_interface *current_setting; |
| int max_size; |
| |
| dev = &data->intf->dev; |
| buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL); |
| if (!buffer) |
| return -ENOMEM; |
| |
| rv = usb_control_msg(data->usb_dev, |
| usb_rcvctrlpipe(data->usb_dev, 0), |
| USBTMC_REQUEST_INITIATE_ABORT_BULK_IN, |
| USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT, |
| data->bTag_last_read, data->bulk_in, |
| buffer, 2, USBTMC_TIMEOUT); |
| |
| if (rv < 0) { |
| dev_err(dev, "usb_control_msg returned %d\n", rv); |
| goto exit; |
| } |
| |
| dev_dbg(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]); |
| |
| if (buffer[0] == USBTMC_STATUS_FAILED) { |
| rv = 0; |
| goto exit; |
| } |
| |
| if (buffer[0] != USBTMC_STATUS_SUCCESS) { |
| dev_err(dev, "INITIATE_ABORT_BULK_IN returned %x\n", |
| buffer[0]); |
| rv = -EPERM; |
| goto exit; |
| } |
| |
| max_size = 0; |
| current_setting = data->intf->cur_altsetting; |
| for (n = 0; n < current_setting->desc.bNumEndpoints; n++) |
| if (current_setting->endpoint[n].desc.bEndpointAddress == |
| data->bulk_in) |
| max_size = usb_endpoint_maxp(¤t_setting->endpoint[n].desc); |
| |
| if (max_size == 0) { |
| dev_err(dev, "Couldn't get wMaxPacketSize\n"); |
| rv = -EPERM; |
| goto exit; |
| } |
| |
| dev_dbg(&data->intf->dev, "wMaxPacketSize is %d\n", max_size); |
| |
| n = 0; |
| |
| do { |
| dev_dbg(dev, "Reading from bulk in EP\n"); |
| |
| rv = usb_bulk_msg(data->usb_dev, |
| usb_rcvbulkpipe(data->usb_dev, |
| data->bulk_in), |
| buffer, USBTMC_SIZE_IOBUFFER, |
| &actual, USBTMC_TIMEOUT); |
| |
| n++; |
| |
| if (rv < 0) { |
| dev_err(dev, "usb_bulk_msg returned %d\n", rv); |
| goto exit; |
| } |
| } while ((actual == max_size) && |
| (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN)); |
| |
| if (actual == max_size) { |
| dev_err(dev, "Couldn't clear device buffer within %d cycles\n", |
| USBTMC_MAX_READS_TO_CLEAR_BULK_IN); |
| rv = -EPERM; |
| goto exit; |
| } |
| |
| n = 0; |
| |
| usbtmc_abort_bulk_in_status: |
| rv = usb_control_msg(data->usb_dev, |
| usb_rcvctrlpipe(data->usb_dev, 0), |
| USBTMC_REQUEST_CHECK_ABORT_BULK_IN_STATUS, |
| USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT, |
| 0, data->bulk_in, buffer, 0x08, |
| USBTMC_TIMEOUT); |
| |
| if (rv < 0) { |
| dev_err(dev, "usb_control_msg returned %d\n", rv); |
| goto exit; |
| } |
| |
| dev_dbg(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]); |
| |
| if (buffer[0] == USBTMC_STATUS_SUCCESS) { |
| rv = 0; |
| goto exit; |
| } |
| |
| if (buffer[0] != USBTMC_STATUS_PENDING) { |
| dev_err(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]); |
| rv = -EPERM; |
| goto exit; |
| } |
| |
| if (buffer[1] == 1) |
| do { |
| dev_dbg(dev, "Reading from bulk in EP\n"); |
| |
| rv = usb_bulk_msg(data->usb_dev, |
| usb_rcvbulkpipe(data->usb_dev, |
| data->bulk_in), |
| buffer, USBTMC_SIZE_IOBUFFER, |
| &actual, USBTMC_TIMEOUT); |
| |
| n++; |
| |
| if (rv < 0) { |
| dev_err(dev, "usb_bulk_msg returned %d\n", rv); |
| goto exit; |
| } |
| } while ((actual == max_size) && |
| (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN)); |
| |
| if (actual == max_size) { |
| dev_err(dev, "Couldn't clear device buffer within %d cycles\n", |
| USBTMC_MAX_READS_TO_CLEAR_BULK_IN); |
| rv = -EPERM; |
| goto exit; |
| } |
| |
| goto usbtmc_abort_bulk_in_status; |
| |
| exit: |
| kfree(buffer); |
| return rv; |
| |
| } |
| |
| static int usbtmc_ioctl_abort_bulk_out_tag(struct usbtmc_device_data *data, |
| u8 tag) |
| { |
| struct device *dev; |
| u8 *buffer; |
| int rv; |
| int n; |
| |
| dev = &data->intf->dev; |
| |
| buffer = kmalloc(8, GFP_KERNEL); |
| if (!buffer) |
| return -ENOMEM; |
| |
| rv = usb_control_msg(data->usb_dev, |
| usb_rcvctrlpipe(data->usb_dev, 0), |
| USBTMC_REQUEST_INITIATE_ABORT_BULK_OUT, |
| USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT, |
| tag, data->bulk_out, |
| buffer, 2, USB_CTRL_GET_TIMEOUT); |
| |
| if (rv < 0) { |
| dev_err(dev, "usb_control_msg returned %d\n", rv); |
| goto exit; |
| } |
| |
| dev_dbg(dev, "INITIATE_ABORT_BULK_OUT returned %x\n", buffer[0]); |
| |
| if (buffer[0] != USBTMC_STATUS_SUCCESS) { |
| dev_err(dev, "INITIATE_ABORT_BULK_OUT returned %x\n", |
| buffer[0]); |
| rv = -EPERM; |
| goto exit; |
| } |
| |
| n = 0; |
| |
| usbtmc_abort_bulk_out_check_status: |
| /* do not stress device with subsequent requests */ |
| msleep(50); |
| rv = usb_control_msg(data->usb_dev, |
| usb_rcvctrlpipe(data->usb_dev, 0), |
| USBTMC_REQUEST_CHECK_ABORT_BULK_OUT_STATUS, |
| USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT, |
| 0, data->bulk_out, buffer, 0x08, |
| USB_CTRL_GET_TIMEOUT); |
| n++; |
| if (rv < 0) { |
| dev_err(dev, "usb_control_msg returned %d\n", rv); |
| goto exit; |
| } |
| |
| dev_dbg(dev, "CHECK_ABORT_BULK_OUT returned %x\n", buffer[0]); |
| |
| if (buffer[0] == USBTMC_STATUS_SUCCESS) |
| goto usbtmc_abort_bulk_out_clear_halt; |
| |
| if ((buffer[0] == USBTMC_STATUS_PENDING) && |
| (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN)) |
| goto usbtmc_abort_bulk_out_check_status; |
| |
| rv = -EPERM; |
| goto exit; |
| |
| usbtmc_abort_bulk_out_clear_halt: |
| rv = usb_clear_halt(data->usb_dev, |
| usb_sndbulkpipe(data->usb_dev, data->bulk_out)); |
| |
| if (rv < 0) { |
| dev_err(dev, "usb_control_msg returned %d\n", rv); |
| goto exit; |
| } |
| rv = 0; |
| |
| exit: |
| kfree(buffer); |
| return rv; |
| } |
| |
| static int usbtmc_ioctl_abort_bulk_out(struct usbtmc_device_data *data) |
| { |
| return usbtmc_ioctl_abort_bulk_out_tag(data, data->bTag_last_write); |
| } |
| |
| static int usbtmc488_ioctl_read_stb(struct usbtmc_file_data *file_data, |
| void __user *arg) |
| { |
| struct usbtmc_device_data *data = file_data->data; |
| struct device *dev = &data->intf->dev; |
| int srq_asserted = 0; |
| u8 *buffer; |
| u8 tag; |
| __u8 stb; |
| int rv; |
| |
| dev_dbg(dev, "Enter ioctl_read_stb iin_ep_present: %d\n", |
| data->iin_ep_present); |
| |
| spin_lock_irq(&data->dev_lock); |
| srq_asserted = atomic_xchg(&file_data->srq_asserted, srq_asserted); |
| if (srq_asserted) { |
| /* a STB with SRQ is already received */ |
| stb = file_data->srq_byte; |
| spin_unlock_irq(&data->dev_lock); |
| rv = put_user(stb, (__u8 __user *)arg); |
| dev_dbg(dev, "stb:0x%02x with srq received %d\n", |
| (unsigned int)stb, rv); |
| return rv; |
| } |
| spin_unlock_irq(&data->dev_lock); |
| |
| buffer = kmalloc(8, GFP_KERNEL); |
| if (!buffer) |
| return -ENOMEM; |
| |
| atomic_set(&data->iin_data_valid, 0); |
| |
| rv = usb_control_msg(data->usb_dev, |
| usb_rcvctrlpipe(data->usb_dev, 0), |
| USBTMC488_REQUEST_READ_STATUS_BYTE, |
| USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, |
| data->iin_bTag, |
| data->ifnum, |
| buffer, 0x03, USBTMC_TIMEOUT); |
| if (rv < 0) { |
| dev_err(dev, "stb usb_control_msg returned %d\n", rv); |
| goto exit; |
| } |
| |
| if (buffer[0] != USBTMC_STATUS_SUCCESS) { |
| dev_err(dev, "control status returned %x\n", buffer[0]); |
| rv = -EIO; |
| goto exit; |
| } |
| |
| if (data->iin_ep_present) { |
| rv = wait_event_interruptible_timeout( |
| data->waitq, |
| atomic_read(&data->iin_data_valid) != 0, |
| file_data->timeout); |
| if (rv < 0) { |
| dev_dbg(dev, "wait interrupted %d\n", rv); |
| goto exit; |
| } |
| |
| if (rv == 0) { |
| dev_dbg(dev, "wait timed out\n"); |
| rv = -ETIMEDOUT; |
| goto exit; |
| } |
| |
| tag = data->bNotify1 & 0x7f; |
| if (tag != data->iin_bTag) { |
| dev_err(dev, "expected bTag %x got %x\n", |
| data->iin_bTag, tag); |
| } |
| |
| stb = data->bNotify2; |
| } else { |
| stb = buffer[2]; |
| } |
| |
| rv = put_user(stb, (__u8 __user *)arg); |
| dev_dbg(dev, "stb:0x%02x received %d\n", (unsigned int)stb, rv); |
| |
| exit: |
| /* bump interrupt bTag */ |
| data->iin_bTag += 1; |
| if (data->iin_bTag > 127) |
| /* 1 is for SRQ see USBTMC-USB488 subclass spec section 4.3.1 */ |
| data->iin_bTag = 2; |
| |
| kfree(buffer); |
| return rv; |
| } |
| |
| static int usbtmc488_ioctl_simple(struct usbtmc_device_data *data, |
| void __user *arg, unsigned int cmd) |
| { |
| struct device *dev = &data->intf->dev; |
| __u8 val; |
| u8 *buffer; |
| u16 wValue; |
| int rv; |
| |
| if (!(data->usb488_caps & USBTMC488_CAPABILITY_SIMPLE)) |
| return -EINVAL; |
| |
| buffer = kmalloc(8, GFP_KERNEL); |
| if (!buffer) |
| return -ENOMEM; |
| |
| if (cmd == USBTMC488_REQUEST_REN_CONTROL) { |
| rv = copy_from_user(&val, arg, sizeof(val)); |
| if (rv) { |
| rv = -EFAULT; |
| goto exit; |
| } |
| wValue = val ? 1 : 0; |
| } else { |
| wValue = 0; |
| } |
| |
| rv = usb_control_msg(data->usb_dev, |
| usb_rcvctrlpipe(data->usb_dev, 0), |
| cmd, |
| USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, |
| wValue, |
| data->ifnum, |
| buffer, 0x01, USBTMC_TIMEOUT); |
| if (rv < 0) { |
| dev_err(dev, "simple usb_control_msg failed %d\n", rv); |
| goto exit; |
| } else if (rv != 1) { |
| dev_warn(dev, "simple usb_control_msg returned %d\n", rv); |
| rv = -EIO; |
| goto exit; |
| } |
| |
| if (buffer[0] != USBTMC_STATUS_SUCCESS) { |
| dev_err(dev, "simple control status returned %x\n", buffer[0]); |
| rv = -EIO; |
| goto exit; |
| } |
| rv = 0; |
| |
| exit: |
| kfree(buffer); |
| return rv; |
| } |
| |
| /* |
| * Sends a TRIGGER Bulk-OUT command message |
| * See the USBTMC-USB488 specification, Table 2. |
| * |
| * Also updates bTag_last_write. |
| */ |
| static int usbtmc488_ioctl_trigger(struct usbtmc_file_data *file_data) |
| { |
| struct usbtmc_device_data *data = file_data->data; |
| int retval; |
| u8 *buffer; |
| int actual; |
| |
| buffer = kzalloc(USBTMC_HEADER_SIZE, GFP_KERNEL); |
| if (!buffer) |
| return -ENOMEM; |
| |
| buffer[0] = 128; |
| buffer[1] = data->bTag; |
| buffer[2] = ~data->bTag; |
| |
| retval = usb_bulk_msg(data->usb_dev, |
| usb_sndbulkpipe(data->usb_dev, |
| data->bulk_out), |
| buffer, USBTMC_HEADER_SIZE, |
| &actual, file_data->timeout); |
| |
| /* Store bTag (in case we need to abort) */ |
| data->bTag_last_write = data->bTag; |
| |
| /* Increment bTag -- and increment again if zero */ |
| data->bTag++; |
| if (!data->bTag) |
| data->bTag++; |
| |
| kfree(buffer); |
| if (retval < 0) { |
| dev_err(&data->intf->dev, "%s returned %d\n", |
| __func__, retval); |
| return retval; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Sends a REQUEST_DEV_DEP_MSG_IN message on the Bulk-OUT endpoint. |
| * @transfer_size: number of bytes to request from the device. |
| * |
| * See the USBTMC specification, Table 4. |
| * |
| * Also updates bTag_last_write. |
| */ |
| static int send_request_dev_dep_msg_in(struct usbtmc_file_data *file_data, |
| size_t transfer_size) |
| { |
| struct usbtmc_device_data *data = file_data->data; |
| int retval; |
| u8 *buffer; |
| int actual; |
| |
| buffer = kmalloc(USBTMC_HEADER_SIZE, GFP_KERNEL); |
| if (!buffer) |
| return -ENOMEM; |
| /* Setup IO buffer for REQUEST_DEV_DEP_MSG_IN message |
| * Refer to class specs for details |
| */ |
| buffer[0] = 2; |
| buffer[1] = data->bTag; |
| buffer[2] = ~data->bTag; |
| buffer[3] = 0; /* Reserved */ |
| buffer[4] = transfer_size >> 0; |
| buffer[5] = transfer_size >> 8; |
| buffer[6] = transfer_size >> 16; |
| buffer[7] = transfer_size >> 24; |
| buffer[8] = file_data->term_char_enabled * 2; |
| /* Use term character? */ |
| buffer[9] = file_data->term_char; |
| buffer[10] = 0; /* Reserved */ |
| buffer[11] = 0; /* Reserved */ |
| |
| /* Send bulk URB */ |
| retval = usb_bulk_msg(data->usb_dev, |
| usb_sndbulkpipe(data->usb_dev, |
| data->bulk_out), |
| buffer, USBTMC_HEADER_SIZE, |
| &actual, file_data->timeout); |
| |
| /* Store bTag (in case we need to abort) */ |
| data->bTag_last_write = data->bTag; |
| |
| /* Increment bTag -- and increment again if zero */ |
| data->bTag++; |
| if (!data->bTag) |
| data->bTag++; |
| |
| kfree(buffer); |
| if (retval < 0) { |
| dev_err(&data->intf->dev, "usb_bulk_msg in send_request_dev_dep_msg_in() returned %d\n", retval); |
| return retval; |
| } |
| |
| return 0; |
| } |
| |
| static ssize_t usbtmc_read(struct file *filp, char __user *buf, |
| size_t count, loff_t *f_pos) |
| { |
| struct usbtmc_file_data *file_data; |
| struct usbtmc_device_data *data; |
| struct device *dev; |
| u32 n_characters; |
| u8 *buffer; |
| int actual; |
| size_t done; |
| size_t remaining; |
| int retval; |
| size_t this_part; |
| |
| /* Get pointer to private data structure */ |
| file_data = filp->private_data; |
| data = file_data->data; |
| dev = &data->intf->dev; |
| |
| buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL); |
| if (!buffer) |
| return -ENOMEM; |
| |
| mutex_lock(&data->io_mutex); |
| if (data->zombie) { |
| retval = -ENODEV; |
| goto exit; |
| } |
| |
| dev_dbg(dev, "usb_bulk_msg_in: count(%zu)\n", count); |
| |
| retval = send_request_dev_dep_msg_in(file_data, count); |
| |
| if (retval < 0) { |
| if (data->auto_abort) |
| usbtmc_ioctl_abort_bulk_out(data); |
| goto exit; |
| } |
| |
| /* Loop until we have fetched everything we requested */ |
| remaining = count; |
| this_part = remaining; |
| done = 0; |
| |
| while (remaining > 0) { |
| /* Send bulk URB */ |
| retval = usb_bulk_msg(data->usb_dev, |
| usb_rcvbulkpipe(data->usb_dev, |
| data->bulk_in), |
| buffer, USBTMC_SIZE_IOBUFFER, &actual, |
| file_data->timeout); |
| |
| dev_dbg(dev, "usb_bulk_msg: retval(%u), done(%zu), remaining(%zu), actual(%d)\n", retval, done, remaining, actual); |
| |
| /* Store bTag (in case we need to abort) */ |
| data->bTag_last_read = data->bTag; |
| |
| if (retval < 0) { |
| dev_dbg(dev, "Unable to read data, error %d\n", retval); |
| if (data->auto_abort) |
| usbtmc_ioctl_abort_bulk_in(data); |
| goto exit; |
| } |
| |
| /* Parse header in first packet */ |
| if (done == 0) { |
| /* Sanity checks for the header */ |
| if (actual < USBTMC_HEADER_SIZE) { |
| dev_err(dev, "Device sent too small first packet: %u < %u\n", actual, USBTMC_HEADER_SIZE); |
| if (data->auto_abort) |
| usbtmc_ioctl_abort_bulk_in(data); |
| goto exit; |
| } |
| |
| if (buffer[0] != 2) { |
| dev_err(dev, "Device sent reply with wrong MsgID: %u != 2\n", buffer[0]); |
| if (data->auto_abort) |
| usbtmc_ioctl_abort_bulk_in(data); |
| goto exit; |
| } |
| |
| if (buffer[1] != data->bTag_last_write) { |
| dev_err(dev, "Device sent reply with wrong bTag: %u != %u\n", buffer[1], data->bTag_last_write); |
| if (data->auto_abort) |
| usbtmc_ioctl_abort_bulk_in(data); |
| goto exit; |
| } |
| |
| /* How many characters did the instrument send? */ |
| n_characters = buffer[4] + |
| (buffer[5] << 8) + |
| (buffer[6] << 16) + |
| (buffer[7] << 24); |
| |
| if (n_characters > this_part) { |
| dev_err(dev, "Device wants to return more data than requested: %u > %zu\n", n_characters, count); |
| if (data->auto_abort) |
| usbtmc_ioctl_abort_bulk_in(data); |
| goto exit; |
| } |
| |
| /* Remove the USBTMC header */ |
| actual -= USBTMC_HEADER_SIZE; |
| |
| /* Check if the message is smaller than requested */ |
| if (remaining > n_characters) |
| remaining = n_characters; |
| /* Remove padding if it exists */ |
| if (actual > remaining) |
| actual = remaining; |
| |
| dev_dbg(dev, "Bulk-IN header: N_characters(%u), bTransAttr(%u)\n", n_characters, buffer[8]); |
| |
| remaining -= actual; |
| |
| /* Terminate if end-of-message bit received from device */ |
| if ((buffer[8] & 0x01) && (actual >= n_characters)) |
| remaining = 0; |
| |
| dev_dbg(dev, "Bulk-IN header: remaining(%zu), buf(%p), buffer(%p) done(%zu)\n", remaining,buf,buffer,done); |
| |
| |
| /* Copy buffer to user space */ |
| if (copy_to_user(buf + done, &buffer[USBTMC_HEADER_SIZE], actual)) { |
| /* There must have been an addressing problem */ |
| retval = -EFAULT; |
| goto exit; |
| } |
| done += actual; |
| } |
| else { |
| if (actual > remaining) |
| actual = remaining; |
| |
| remaining -= actual; |
| |
| dev_dbg(dev, "Bulk-IN header cont: actual(%u), done(%zu), remaining(%zu), buf(%p), buffer(%p)\n", actual, done, remaining,buf,buffer); |
| |
| /* Copy buffer to user space */ |
| if (copy_to_user(buf + done, buffer, actual)) { |
| /* There must have been an addressing problem */ |
| retval = -EFAULT; |
| goto exit; |
| } |
| done += actual; |
| } |
| } |
| |
| /* Update file position value */ |
| *f_pos = *f_pos + done; |
| retval = done; |
| |
| exit: |
| mutex_unlock(&data->io_mutex); |
| kfree(buffer); |
| return retval; |
| } |
| |
| static ssize_t usbtmc_write(struct file *filp, const char __user *buf, |
| size_t count, loff_t *f_pos) |
| { |
| struct usbtmc_file_data *file_data; |
| struct usbtmc_device_data *data; |
| u8 *buffer; |
| int retval; |
| int actual; |
| unsigned long int n_bytes; |
| int remaining; |
| int done; |
| int this_part; |
| |
| file_data = filp->private_data; |
| data = file_data->data; |
| |
| buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL); |
| if (!buffer) |
| return -ENOMEM; |
| |
| mutex_lock(&data->io_mutex); |
| if (data->zombie) { |
| retval = -ENODEV; |
| goto exit; |
| } |
| |
| remaining = count; |
| done = 0; |
| |
| while (remaining > 0) { |
| if (remaining > USBTMC_SIZE_IOBUFFER - USBTMC_HEADER_SIZE) { |
| this_part = USBTMC_SIZE_IOBUFFER - USBTMC_HEADER_SIZE; |
| buffer[8] = 0; |
| } else { |
| this_part = remaining; |
| buffer[8] = file_data->eom_val; |
| } |
| |
| /* Setup IO buffer for DEV_DEP_MSG_OUT message */ |
| buffer[0] = 1; |
| buffer[1] = data->bTag; |
| buffer[2] = ~data->bTag; |
| buffer[3] = 0; /* Reserved */ |
| buffer[4] = this_part >> 0; |
| buffer[5] = this_part >> 8; |
| buffer[6] = this_part >> 16; |
| buffer[7] = this_part >> 24; |
| /* buffer[8] is set above... */ |
| buffer[9] = 0; /* Reserved */ |
| buffer[10] = 0; /* Reserved */ |
| buffer[11] = 0; /* Reserved */ |
| |
| if (copy_from_user(&buffer[USBTMC_HEADER_SIZE], buf + done, this_part)) { |
| retval = -EFAULT; |
| goto exit; |
| } |
| |
| n_bytes = roundup(USBTMC_HEADER_SIZE + this_part, 4); |
| memset(buffer + USBTMC_HEADER_SIZE + this_part, 0, n_bytes - (USBTMC_HEADER_SIZE + this_part)); |
| |
| do { |
| retval = usb_bulk_msg(data->usb_dev, |
| usb_sndbulkpipe(data->usb_dev, |
| data->bulk_out), |
| buffer, n_bytes, |
| &actual, file_data->timeout); |
| if (retval != 0) |
| break; |
| n_bytes -= actual; |
| } while (n_bytes); |
| |
| data->bTag_last_write = data->bTag; |
| data->bTag++; |
| |
| if (!data->bTag) |
| data->bTag++; |
| |
| if (retval < 0) { |
| dev_err(&data->intf->dev, |
| "Unable to send data, error %d\n", retval); |
| if (data->auto_abort) |
| usbtmc_ioctl_abort_bulk_out(data); |
| goto exit; |
| } |
| |
| remaining -= this_part; |
| done += this_part; |
| } |
| |
| retval = count; |
| exit: |
| mutex_unlock(&data->io_mutex); |
| kfree(buffer); |
| return retval; |
| } |
| |
| static int usbtmc_ioctl_clear(struct usbtmc_device_data *data) |
| { |
| struct usb_host_interface *current_setting; |
| struct usb_endpoint_descriptor *desc; |
| struct device *dev; |
| u8 *buffer; |
| int rv; |
| int n; |
| int actual = 0; |
| int max_size; |
| |
| dev = &data->intf->dev; |
| |
| dev_dbg(dev, "Sending INITIATE_CLEAR request\n"); |
| |
| buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL); |
| if (!buffer) |
| return -ENOMEM; |
| |
| rv = usb_control_msg(data->usb_dev, |
| usb_rcvctrlpipe(data->usb_dev, 0), |
| USBTMC_REQUEST_INITIATE_CLEAR, |
| USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, |
| 0, 0, buffer, 1, USBTMC_TIMEOUT); |
| if (rv < 0) { |
| dev_err(dev, "usb_control_msg returned %d\n", rv); |
| goto exit; |
| } |
| |
| dev_dbg(dev, "INITIATE_CLEAR returned %x\n", buffer[0]); |
| |
| if (buffer[0] != USBTMC_STATUS_SUCCESS) { |
| dev_err(dev, "INITIATE_CLEAR returned %x\n", buffer[0]); |
| rv = -EPERM; |
| goto exit; |
| } |
| |
| max_size = 0; |
| current_setting = data->intf->cur_altsetting; |
| for (n = 0; n < current_setting->desc.bNumEndpoints; n++) { |
| desc = ¤t_setting->endpoint[n].desc; |
| if (desc->bEndpointAddress == data->bulk_in) |
| max_size = usb_endpoint_maxp(desc); |
| } |
| |
| if (max_size == 0) { |
| dev_err(dev, "Couldn't get wMaxPacketSize\n"); |
| rv = -EPERM; |
| goto exit; |
| } |
| |
| dev_dbg(dev, "wMaxPacketSize is %d\n", max_size); |
| |
| n = 0; |
| |
| usbtmc_clear_check_status: |
| |
| dev_dbg(dev, "Sending CHECK_CLEAR_STATUS request\n"); |
| |
| rv = usb_control_msg(data->usb_dev, |
| usb_rcvctrlpipe(data->usb_dev, 0), |
| USBTMC_REQUEST_CHECK_CLEAR_STATUS, |
| USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, |
| 0, 0, buffer, 2, USBTMC_TIMEOUT); |
| if (rv < 0) { |
| dev_err(dev, "usb_control_msg returned %d\n", rv); |
| goto exit; |
| } |
| |
| dev_dbg(dev, "CHECK_CLEAR_STATUS returned %x\n", buffer[0]); |
| |
| if (buffer[0] == USBTMC_STATUS_SUCCESS) |
| goto usbtmc_clear_bulk_out_halt; |
| |
| if (buffer[0] != USBTMC_STATUS_PENDING) { |
| dev_err(dev, "CHECK_CLEAR_STATUS returned %x\n", buffer[0]); |
| rv = -EPERM; |
| goto exit; |
| } |
| |
| if (buffer[1] == 1) |
| do { |
| dev_dbg(dev, "Reading from bulk in EP\n"); |
| |
| actual = 0; |
| rv = usb_bulk_msg(data->usb_dev, |
| usb_rcvbulkpipe(data->usb_dev, |
| data->bulk_in), |
| buffer, USBTMC_SIZE_IOBUFFER, |
| &actual, USBTMC_TIMEOUT); |
| n++; |
| |
| if (rv < 0) { |
| dev_err(dev, "usb_control_msg returned %d\n", |
| rv); |
| goto exit; |
| } |
| } while ((actual == max_size) && |
| (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN)); |
| |
| if (actual == max_size) { |
| dev_err(dev, "Couldn't clear device buffer within %d cycles\n", |
| USBTMC_MAX_READS_TO_CLEAR_BULK_IN); |
| rv = -EPERM; |
| goto exit; |
| } |
| |
| goto usbtmc_clear_check_status; |
| |
| usbtmc_clear_bulk_out_halt: |
| |
| rv = usb_clear_halt(data->usb_dev, |
| usb_sndbulkpipe(data->usb_dev, data->bulk_out)); |
| if (rv < 0) { |
| dev_err(dev, "usb_control_msg returned %d\n", rv); |
| goto exit; |
| } |
| rv = 0; |
| |
| exit: |
| kfree(buffer); |
| return rv; |
| } |
| |
| static int usbtmc_ioctl_clear_out_halt(struct usbtmc_device_data *data) |
| { |
| int rv; |
| |
| rv = usb_clear_halt(data->usb_dev, |
| usb_sndbulkpipe(data->usb_dev, data->bulk_out)); |
| |
| if (rv < 0) { |
| dev_err(&data->usb_dev->dev, "usb_control_msg returned %d\n", |
| rv); |
| return rv; |
| } |
| return 0; |
| } |
| |
| static int usbtmc_ioctl_clear_in_halt(struct usbtmc_device_data *data) |
| { |
| int rv; |
| |
| rv = usb_clear_halt(data->usb_dev, |
| usb_rcvbulkpipe(data->usb_dev, data->bulk_in)); |
| |
| if (rv < 0) { |
| dev_err(&data->usb_dev->dev, "usb_control_msg returned %d\n", |
| rv); |
| return rv; |
| } |
| return 0; |
| } |
| |
| static int get_capabilities(struct usbtmc_device_data *data) |
| { |
| struct device *dev = &data->usb_dev->dev; |
| char *buffer; |
| int rv = 0; |
| |
| buffer = kmalloc(0x18, GFP_KERNEL); |
| if (!buffer) |
| return -ENOMEM; |
| |
| rv = usb_control_msg(data->usb_dev, usb_rcvctrlpipe(data->usb_dev, 0), |
| USBTMC_REQUEST_GET_CAPABILITIES, |
| USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, |
| 0, 0, buffer, 0x18, USBTMC_TIMEOUT); |
| if (rv < 0) { |
| dev_err(dev, "usb_control_msg returned %d\n", rv); |
| goto err_out; |
| } |
| |
| dev_dbg(dev, "GET_CAPABILITIES returned %x\n", buffer[0]); |
| if (buffer[0] != USBTMC_STATUS_SUCCESS) { |
| dev_err(dev, "GET_CAPABILITIES returned %x\n", buffer[0]); |
| rv = -EPERM; |
| goto err_out; |
| } |
| dev_dbg(dev, "Interface capabilities are %x\n", buffer[4]); |
| dev_dbg(dev, "Device capabilities are %x\n", buffer[5]); |
| dev_dbg(dev, "USB488 interface capabilities are %x\n", buffer[14]); |
| dev_dbg(dev, "USB488 device capabilities are %x\n", buffer[15]); |
| |
| data->capabilities.interface_capabilities = buffer[4]; |
| data->capabilities.device_capabilities = buffer[5]; |
| data->capabilities.usb488_interface_capabilities = buffer[14]; |
| data->capabilities.usb488_device_capabilities = buffer[15]; |
| data->usb488_caps = (buffer[14] & 0x07) | ((buffer[15] & 0x0f) << 4); |
| rv = 0; |
| |
| err_out: |
| kfree(buffer); |
| return rv; |
| } |
| |
| #define capability_attribute(name) \ |
| static ssize_t name##_show(struct device *dev, \ |
| struct device_attribute *attr, char *buf) \ |
| { \ |
| struct usb_interface *intf = to_usb_interface(dev); \ |
| struct usbtmc_device_data *data = usb_get_intfdata(intf); \ |
| \ |
| return sprintf(buf, "%d\n", data->capabilities.name); \ |
| } \ |
| static DEVICE_ATTR_RO(name) |
| |
| capability_attribute(interface_capabilities); |
| capability_attribute(device_capabilities); |
| capability_attribute(usb488_interface_capabilities); |
| capability_attribute(usb488_device_capabilities); |
| |
| static struct attribute *capability_attrs[] = { |
| &dev_attr_interface_capabilities.attr, |
| &dev_attr_device_capabilities.attr, |
| &dev_attr_usb488_interface_capabilities.attr, |
| &dev_attr_usb488_device_capabilities.attr, |
| NULL, |
| }; |
| |
| static const struct attribute_group capability_attr_grp = { |
| .attrs = capability_attrs, |
| }; |
| |
| static ssize_t TermChar_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct usb_interface *intf = to_usb_interface(dev); |
| struct usbtmc_device_data *data = usb_get_intfdata(intf); |
| |
| return sprintf(buf, "%c\n", data->TermChar); |
| } |
| |
| static ssize_t TermChar_store(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t count) |
| { |
| struct usb_interface *intf = to_usb_interface(dev); |
| struct usbtmc_device_data *data = usb_get_intfdata(intf); |
| |
| if (count < 1) |
| return -EINVAL; |
| data->TermChar = buf[0]; |
| return count; |
| } |
| static DEVICE_ATTR_RW(TermChar); |
| |
| #define data_attribute(name) \ |
| static ssize_t name##_show(struct device *dev, \ |
| struct device_attribute *attr, char *buf) \ |
| { \ |
| struct usb_interface *intf = to_usb_interface(dev); \ |
| struct usbtmc_device_data *data = usb_get_intfdata(intf); \ |
| \ |
| return sprintf(buf, "%d\n", data->name); \ |
| } \ |
| static ssize_t name##_store(struct device *dev, \ |
| struct device_attribute *attr, \ |
| const char *buf, size_t count) \ |
| { \ |
| struct usb_interface *intf = to_usb_interface(dev); \ |
| struct usbtmc_device_data *data = usb_get_intfdata(intf); \ |
| ssize_t result; \ |
| unsigned val; \ |
| \ |
| result = sscanf(buf, "%u\n", &val); \ |
| if (result != 1) \ |
| result = -EINVAL; \ |
| data->name = val; \ |
| if (result < 0) \ |
| return result; \ |
| else \ |
| return count; \ |
| } \ |
| static DEVICE_ATTR_RW(name) |
| |
| data_attribute(TermCharEnabled); |
| data_attribute(auto_abort); |
| |
| static struct attribute *data_attrs[] = { |
| &dev_attr_TermChar.attr, |
| &dev_attr_TermCharEnabled.attr, |
| &dev_attr_auto_abort.attr, |
| NULL, |
| }; |
| |
| static const struct attribute_group data_attr_grp = { |
| .attrs = data_attrs, |
| }; |
| |
| static int usbtmc_ioctl_indicator_pulse(struct usbtmc_device_data *data) |
| { |
| struct device *dev; |
| u8 *buffer; |
| int rv; |
| |
| dev = &data->intf->dev; |
| |
| buffer = kmalloc(2, GFP_KERNEL); |
| if (!buffer) |
| return -ENOMEM; |
| |
| rv = usb_control_msg(data->usb_dev, |
| usb_rcvctrlpipe(data->usb_dev, 0), |
| USBTMC_REQUEST_INDICATOR_PULSE, |
| USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, |
| 0, 0, buffer, 0x01, USBTMC_TIMEOUT); |
| |
| if (rv < 0) { |
| dev_err(dev, "usb_control_msg returned %d\n", rv); |
| goto exit; |
| } |
| |
| dev_dbg(dev, "INDICATOR_PULSE returned %x\n", buffer[0]); |
| |
| if (buffer[0] != USBTMC_STATUS_SUCCESS) { |
| dev_err(dev, "INDICATOR_PULSE returned %x\n", buffer[0]); |
| rv = -EPERM; |
| goto exit; |
| } |
| rv = 0; |
| |
| exit: |
| kfree(buffer); |
| return rv; |
| } |
| |
| /* |
| * Get the usb timeout value |
| */ |
| static int usbtmc_ioctl_get_timeout(struct usbtmc_file_data *file_data, |
| void __user *arg) |
| { |
| u32 timeout; |
| |
| timeout = file_data->timeout; |
| |
| return put_user(timeout, (__u32 __user *)arg); |
| } |
| |
| /* |
| * Set the usb timeout value |
| */ |
| static int usbtmc_ioctl_set_timeout(struct usbtmc_file_data *file_data, |
| void __user *arg) |
| { |
| u32 timeout; |
| |
| if (get_user(timeout, (__u32 __user *)arg)) |
| return -EFAULT; |
| |
| /* Note that timeout = 0 means |
| * MAX_SCHEDULE_TIMEOUT in usb_control_msg |
| */ |
| if (timeout < USBTMC_MIN_TIMEOUT) |
| return -EINVAL; |
| |
| file_data->timeout = timeout; |
| |
| return 0; |
| } |
| |
| /* |
| * enables/disables sending EOM on write |
| */ |
| static int usbtmc_ioctl_eom_enable(struct usbtmc_file_data *file_data, |
| void __user *arg) |
| { |
| u8 eom_enable; |
| |
| if (copy_from_user(&eom_enable, arg, sizeof(eom_enable))) |
| return -EFAULT; |
| |
| if (eom_enable > 1) |
| return -EINVAL; |
| |
| file_data->eom_val = eom_enable; |
| |
| return 0; |
| } |
| |
| /* |
| * Configure termination character for read() |
| */ |
| static int usbtmc_ioctl_config_termc(struct usbtmc_file_data *file_data, |
| void __user *arg) |
| { |
| struct usbtmc_termchar termc; |
| |
| if (copy_from_user(&termc, arg, sizeof(termc))) |
| return -EFAULT; |
| |
| if ((termc.term_char_enabled > 1) || |
| (termc.term_char_enabled && |
| !(file_data->data->capabilities.device_capabilities & 1))) |
| return -EINVAL; |
| |
| file_data->term_char = termc.term_char; |
| file_data->term_char_enabled = termc.term_char_enabled; |
| |
| return 0; |
| } |
| |
| static long usbtmc_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
| { |
| struct usbtmc_file_data *file_data; |
| struct usbtmc_device_data *data; |
| int retval = -EBADRQC; |
| |
| file_data = file->private_data; |
| data = file_data->data; |
| |
| mutex_lock(&data->io_mutex); |
| if (data->zombie) { |
| retval = -ENODEV; |
| goto skip_io_on_zombie; |
| } |
| |
| switch (cmd) { |
| case USBTMC_IOCTL_CLEAR_OUT_HALT: |
| retval = usbtmc_ioctl_clear_out_halt(data); |
| break; |
| |
| case USBTMC_IOCTL_CLEAR_IN_HALT: |
| retval = usbtmc_ioctl_clear_in_halt(data); |
| break; |
| |
| case USBTMC_IOCTL_INDICATOR_PULSE: |
| retval = usbtmc_ioctl_indicator_pulse(data); |
| break; |
| |
| case USBTMC_IOCTL_CLEAR: |
| retval = usbtmc_ioctl_clear(data); |
| break; |
| |
| case USBTMC_IOCTL_ABORT_BULK_OUT: |
| retval = usbtmc_ioctl_abort_bulk_out(data); |
| break; |
| |
| case USBTMC_IOCTL_ABORT_BULK_IN: |
| retval = usbtmc_ioctl_abort_bulk_in(data); |
| break; |
| |
| case USBTMC_IOCTL_GET_TIMEOUT: |
| retval = usbtmc_ioctl_get_timeout(file_data, |
| (void __user *)arg); |
| break; |
| |
| case USBTMC_IOCTL_SET_TIMEOUT: |
| retval = usbtmc_ioctl_set_timeout(file_data, |
| (void __user *)arg); |
| break; |
| |
| case USBTMC_IOCTL_EOM_ENABLE: |
| retval = usbtmc_ioctl_eom_enable(file_data, |
| (void __user *)arg); |
| break; |
| |
| case USBTMC_IOCTL_CONFIG_TERMCHAR: |
| retval = usbtmc_ioctl_config_termc(file_data, |
| (void __user *)arg); |
| break; |
| |
| case USBTMC488_IOCTL_GET_CAPS: |
| retval = copy_to_user((void __user *)arg, |
| &data->usb488_caps, |
| sizeof(data->usb488_caps)); |
| if (retval) |
| retval = -EFAULT; |
| break; |
| |
| case USBTMC488_IOCTL_READ_STB: |
| retval = usbtmc488_ioctl_read_stb(file_data, |
| (void __user *)arg); |
| break; |
| |
| case USBTMC488_IOCTL_REN_CONTROL: |
| retval = usbtmc488_ioctl_simple(data, (void __user *)arg, |
| USBTMC488_REQUEST_REN_CONTROL); |
| break; |
| |
| case USBTMC488_IOCTL_GOTO_LOCAL: |
| retval = usbtmc488_ioctl_simple(data, (void __user *)arg, |
| USBTMC488_REQUEST_GOTO_LOCAL); |
| break; |
| |
| case USBTMC488_IOCTL_LOCAL_LOCKOUT: |
| retval = usbtmc488_ioctl_simple(data, (void __user *)arg, |
| USBTMC488_REQUEST_LOCAL_LOCKOUT); |
| break; |
| |
| case USBTMC488_IOCTL_TRIGGER: |
| retval = usbtmc488_ioctl_trigger(file_data); |
| break; |
| } |
| |
| skip_io_on_zombie: |
| mutex_unlock(&data->io_mutex); |
| return retval; |
| } |
| |
| static int usbtmc_fasync(int fd, struct file *file, int on) |
| { |
| struct usbtmc_file_data *file_data = file->private_data; |
| |
| return fasync_helper(fd, file, on, &file_data->data->fasync); |
| } |
| |
| static __poll_t usbtmc_poll(struct file *file, poll_table *wait) |
| { |
| struct usbtmc_file_data *file_data = file->private_data; |
| struct usbtmc_device_data *data = file_data->data; |
| __poll_t mask; |
| |
| mutex_lock(&data->io_mutex); |
| |
| if (data->zombie) { |
| mask = EPOLLHUP | EPOLLERR; |
| goto no_poll; |
| } |
| |
| poll_wait(file, &data->waitq, wait); |
| |
| mask = (atomic_read(&file_data->srq_asserted)) ? EPOLLPRI : 0; |
| |
| no_poll: |
| mutex_unlock(&data->io_mutex); |
| return mask; |
| } |
| |
| static const struct file_operations fops = { |
| .owner = THIS_MODULE, |
| .read = usbtmc_read, |
| .write = usbtmc_write, |
| .open = usbtmc_open, |
| .release = usbtmc_release, |
| .unlocked_ioctl = usbtmc_ioctl, |
| #ifdef CONFIG_COMPAT |
| .compat_ioctl = usbtmc_ioctl, |
| #endif |
| .fasync = usbtmc_fasync, |
| .poll = usbtmc_poll, |
| .llseek = default_llseek, |
| }; |
| |
| static struct usb_class_driver usbtmc_class = { |
| .name = "usbtmc%d", |
| .fops = &fops, |
| .minor_base = USBTMC_MINOR_BASE, |
| }; |
| |
| static void usbtmc_interrupt(struct urb *urb) |
| { |
| struct usbtmc_device_data *data = urb->context; |
| struct device *dev = &data->intf->dev; |
| int status = urb->status; |
| int rv; |
| |
| dev_dbg(&data->intf->dev, "int status: %d len %d\n", |
| status, urb->actual_length); |
| |
| switch (status) { |
| case 0: /* SUCCESS */ |
| /* check for valid STB notification */ |
| if (data->iin_buffer[0] > 0x81) { |
| data->bNotify1 = data->iin_buffer[0]; |
| data->bNotify2 = data->iin_buffer[1]; |
| atomic_set(&data->iin_data_valid, 1); |
| wake_up_interruptible(&data->waitq); |
| goto exit; |
| } |
| /* check for SRQ notification */ |
| if (data->iin_buffer[0] == 0x81) { |
| unsigned long flags; |
| struct list_head *elem; |
| |
| if (data->fasync) |
| kill_fasync(&data->fasync, |
| SIGIO, POLL_PRI); |
| |
| spin_lock_irqsave(&data->dev_lock, flags); |
| list_for_each(elem, &data->file_list) { |
| struct usbtmc_file_data *file_data; |
| |
| file_data = list_entry(elem, |
| struct usbtmc_file_data, |
| file_elem); |
| file_data->srq_byte = data->iin_buffer[1]; |
| atomic_set(&file_data->srq_asserted, 1); |
| } |
| spin_unlock_irqrestore(&data->dev_lock, flags); |
| |
| dev_dbg(dev, "srq received bTag %x stb %x\n", |
| (unsigned int)data->iin_buffer[0], |
| (unsigned int)data->iin_buffer[1]); |
| wake_up_interruptible_all(&data->waitq); |
| goto exit; |
| } |
| dev_warn(dev, "invalid notification: %x\n", |
| data->iin_buffer[0]); |
| break; |
| case -EOVERFLOW: |
| dev_err(dev, "overflow with length %d, actual length is %d\n", |
| data->iin_wMaxPacketSize, urb->actual_length); |
| /* fall through */ |
| default: |
| /* urb terminated, clean up */ |
| dev_dbg(dev, "urb terminated, status: %d\n", status); |
| return; |
| } |
| exit: |
| rv = usb_submit_urb(urb, GFP_ATOMIC); |
| if (rv) |
| dev_err(dev, "usb_submit_urb failed: %d\n", rv); |
| } |
| |
| static void usbtmc_free_int(struct usbtmc_device_data *data) |
| { |
| if (!data->iin_ep_present || !data->iin_urb) |
| return; |
| usb_kill_urb(data->iin_urb); |
| kfree(data->iin_buffer); |
| usb_free_urb(data->iin_urb); |
| kref_put(&data->kref, usbtmc_delete); |
| } |
| |
| static int usbtmc_probe(struct usb_interface *intf, |
| const struct usb_device_id *id) |
| { |
| struct usbtmc_device_data *data; |
| struct usb_host_interface *iface_desc; |
| struct usb_endpoint_descriptor *bulk_in, *bulk_out, *int_in; |
| int retcode; |
| |
| dev_dbg(&intf->dev, "%s called\n", __func__); |
| |
| data = kzalloc(sizeof(*data), GFP_KERNEL); |
| if (!data) |
| return -ENOMEM; |
| |
| data->intf = intf; |
| data->id = id; |
| data->usb_dev = usb_get_dev(interface_to_usbdev(intf)); |
| usb_set_intfdata(intf, data); |
| kref_init(&data->kref); |
| mutex_init(&data->io_mutex); |
| init_waitqueue_head(&data->waitq); |
| atomic_set(&data->iin_data_valid, 0); |
| INIT_LIST_HEAD(&data->file_list); |
| spin_lock_init(&data->dev_lock); |
| |
| data->zombie = 0; |
| |
| /* Initialize USBTMC bTag and other fields */ |
| data->bTag = 1; |
| data->TermCharEnabled = 0; |
| data->TermChar = '\n'; |
| /* 2 <= bTag <= 127 USBTMC-USB488 subclass specification 4.3.1 */ |
| data->iin_bTag = 2; |
| |
| /* USBTMC devices have only one setting, so use that */ |
| iface_desc = data->intf->cur_altsetting; |
| data->ifnum = iface_desc->desc.bInterfaceNumber; |
| |
| /* Find bulk endpoints */ |
| retcode = usb_find_common_endpoints(iface_desc, |
| &bulk_in, &bulk_out, NULL, NULL); |
| if (retcode) { |
| dev_err(&intf->dev, "bulk endpoints not found\n"); |
| goto err_put; |
| } |
| |
| data->bulk_in = bulk_in->bEndpointAddress; |
| dev_dbg(&intf->dev, "Found bulk in endpoint at %u\n", data->bulk_in); |
| |
| data->bulk_out = bulk_out->bEndpointAddress; |
| dev_dbg(&intf->dev, "Found Bulk out endpoint at %u\n", data->bulk_out); |
| |
| /* Find int endpoint */ |
| retcode = usb_find_int_in_endpoint(iface_desc, &int_in); |
| if (!retcode) { |
| data->iin_ep_present = 1; |
| data->iin_ep = int_in->bEndpointAddress; |
| data->iin_wMaxPacketSize = usb_endpoint_maxp(int_in); |
| data->iin_interval = int_in->bInterval; |
| dev_dbg(&intf->dev, "Found Int in endpoint at %u\n", |
| data->iin_ep); |
| } |
| |
| retcode = get_capabilities(data); |
| if (retcode) |
| dev_err(&intf->dev, "can't read capabilities\n"); |
| else |
| retcode = sysfs_create_group(&intf->dev.kobj, |
| &capability_attr_grp); |
| |
| if (data->iin_ep_present) { |
| /* allocate int urb */ |
| data->iin_urb = usb_alloc_urb(0, GFP_KERNEL); |
| if (!data->iin_urb) { |
| retcode = -ENOMEM; |
| goto error_register; |
| } |
| |
| /* Protect interrupt in endpoint data until iin_urb is freed */ |
| kref_get(&data->kref); |
| |
| /* allocate buffer for interrupt in */ |
| data->iin_buffer = kmalloc(data->iin_wMaxPacketSize, |
| GFP_KERNEL); |
| if (!data->iin_buffer) { |
| retcode = -ENOMEM; |
| goto error_register; |
| } |
| |
| /* fill interrupt urb */ |
| usb_fill_int_urb(data->iin_urb, data->usb_dev, |
| usb_rcvintpipe(data->usb_dev, data->iin_ep), |
| data->iin_buffer, data->iin_wMaxPacketSize, |
| usbtmc_interrupt, |
| data, data->iin_interval); |
| |
| retcode = usb_submit_urb(data->iin_urb, GFP_KERNEL); |
| if (retcode) { |
| dev_err(&intf->dev, "Failed to submit iin_urb\n"); |
| goto error_register; |
| } |
| } |
| |
| retcode = sysfs_create_group(&intf->dev.kobj, &data_attr_grp); |
| |
| retcode = usb_register_dev(intf, &usbtmc_class); |
| if (retcode) { |
| dev_err(&intf->dev, "Not able to get a minor" |
| " (base %u, slice default): %d\n", USBTMC_MINOR_BASE, |
| retcode); |
| goto error_register; |
| } |
| dev_dbg(&intf->dev, "Using minor number %d\n", intf->minor); |
| |
| return 0; |
| |
| error_register: |
| sysfs_remove_group(&intf->dev.kobj, &capability_attr_grp); |
| sysfs_remove_group(&intf->dev.kobj, &data_attr_grp); |
| usbtmc_free_int(data); |
| err_put: |
| kref_put(&data->kref, usbtmc_delete); |
| return retcode; |
| } |
| |
| static void usbtmc_disconnect(struct usb_interface *intf) |
| { |
| struct usbtmc_device_data *data = usb_get_intfdata(intf); |
| |
| usb_deregister_dev(intf, &usbtmc_class); |
| sysfs_remove_group(&intf->dev.kobj, &capability_attr_grp); |
| sysfs_remove_group(&intf->dev.kobj, &data_attr_grp); |
| mutex_lock(&data->io_mutex); |
| data->zombie = 1; |
| wake_up_interruptible_all(&data->waitq); |
| mutex_unlock(&data->io_mutex); |
| usbtmc_free_int(data); |
| kref_put(&data->kref, usbtmc_delete); |
| } |
| |
| static int usbtmc_suspend(struct usb_interface *intf, pm_message_t message) |
| { |
| /* this driver does not have pending URBs */ |
| return 0; |
| } |
| |
| static int usbtmc_resume(struct usb_interface *intf) |
| { |
| return 0; |
| } |
| |
| static struct usb_driver usbtmc_driver = { |
| .name = "usbtmc", |
| .id_table = usbtmc_devices, |
| .probe = usbtmc_probe, |
| .disconnect = usbtmc_disconnect, |
| .suspend = usbtmc_suspend, |
| .resume = usbtmc_resume, |
| }; |
| |
| module_usb_driver(usbtmc_driver); |
| |
| MODULE_LICENSE("GPL"); |