/** * 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 * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * 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. * * The GNU General Public License is available at * http://www.gnu.org/copyleft/gpl.html. */ #include #include #include #include #include #include #include #include #include #include #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 /* 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; unsigned int bulk_in; unsigned int bulk_out; u8 bTag; u8 bTag_last_write; /* needed for abort */ u8 bTag_last_read; /* needed for abort */ /* 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 */ }; #define to_usbtmc_data(d) container_of(d, struct usbtmc_device_data, kref) /* 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; int retval = 0; intf = usb_find_interface(&usbtmc_driver, iminor(inode)); if (!intf) { printk(KERN_ERR KBUILD_MODNAME ": can not find device for minor %d", iminor(inode)); retval = -ENODEV; goto exit; } data = usb_get_intfdata(intf); kref_get(&data->kref); /* Store pointer in file structure's private data field */ filp->private_data = data; exit: return retval; } static int usbtmc_release(struct inode *inode, struct file *file) { struct usbtmc_device_data *data = file->private_data; kref_put(&data->kref, usbtmc_delete); 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(struct usbtmc_device_data *data) { 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, data->bTag_last_write, data->bulk_out, 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_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: 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, USBTMC_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 ssize_t usbtmc_read(struct file *filp, char __user *buf, size_t count, loff_t *f_pos) { 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 */ data = filp->private_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; } remaining = count; done = 0; while (remaining > 0) { if (remaining > USBTMC_SIZE_IOBUFFER - 12 - 3) this_part = USBTMC_SIZE_IOBUFFER - 12 - 3; else this_part = remaining; /* Setup IO buffer for 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] = (this_part) & 255; buffer[5] = ((this_part) >> 8) & 255; buffer[6] = ((this_part) >> 16) & 255; buffer[7] = ((this_part) >> 24) & 255; buffer[8] = data->TermCharEnabled * 2; /* Use term character? */ buffer[9] = data->TermChar; 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, 12, &actual, USBTMC_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)++; if (retval < 0) { dev_err(dev, "usb_bulk_msg returned %d\n", retval); if (data->auto_abort) usbtmc_ioctl_abort_bulk_out(data); goto exit; } /* Send bulk URB */ retval = usb_bulk_msg(data->usb_dev, usb_rcvbulkpipe(data->usb_dev, data->bulk_in), buffer, USBTMC_SIZE_IOBUFFER, &actual, USBTMC_TIMEOUT); /* Store bTag (in case we need to abort) */ data->bTag_last_read = data->bTag; if (retval < 0) { dev_err(dev, "Unable to read data, error %d\n", retval); 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); /* Ensure the instrument doesn't lie about it */ if(n_characters > actual - 12) { dev_err(dev, "Device lies about message size: %u > %d\n", n_characters, actual - 12); n_characters = actual - 12; } /* Ensure the instrument doesn't send more back than requested */ if(n_characters > this_part) { dev_err(dev, "Device returns more than requested: %zu > %zu\n", done + n_characters, done + this_part); n_characters = this_part; } /* Bound amount of data received by amount of data requested */ if (n_characters > this_part) n_characters = this_part; /* Copy buffer to user space */ if (copy_to_user(buf + done, &buffer[12], n_characters)) { /* There must have been an addressing problem */ retval = -EFAULT; goto exit; } done += n_characters; /* Terminate if end-of-message bit received from device */ if ((buffer[8] & 0x01) && (actual >= n_characters + 12)) remaining = 0; else remaining -= n_characters; } /* 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_device_data *data; u8 *buffer; int retval; int actual; unsigned long int n_bytes; int remaining; int done; int this_part; data = filp->private_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 - 12) { this_part = USBTMC_SIZE_IOBUFFER - 12; buffer[8] = 0; } else { this_part = remaining; buffer[8] = 1; } /* 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 & 255; buffer[5] = (this_part >> 8) & 255; buffer[6] = (this_part >> 16) & 255; buffer[7] = (this_part >> 24) & 255; /* buffer[8] is set above... */ buffer[9] = 0; /* Reserved */ buffer[10] = 0; /* Reserved */ buffer[11] = 0; /* Reserved */ if (copy_from_user(&buffer[12], buf + done, this_part)) { retval = -EFAULT; goto exit; } n_bytes = roundup(12 + this_part, 4); memset(buffer + 12 + this_part, 0, n_bytes - (12 + this_part)); do { retval = usb_bulk_msg(data->usb_dev, usb_sndbulkpipe(data->usb_dev, data->bulk_out), buffer, n_bytes, &actual, USBTMC_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; 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"); 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) { u8 *buffer; int rv; buffer = kmalloc(2, GFP_KERNEL); if (!buffer) return -ENOMEM; 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); goto exit; } rv = 0; exit: kfree(buffer); return rv; } static int usbtmc_ioctl_clear_in_halt(struct usbtmc_device_data *data) { u8 *buffer; int rv; buffer = kmalloc(2, GFP_KERNEL); if (!buffer) return -ENOMEM; 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); goto exit; } rv = 0; exit: kfree(buffer); return rv; } 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]; rv = 0; err_out: kfree(buffer); return rv; } #define capability_attribute(name) \ static ssize_t show_##name(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(name, S_IRUGO, show_##name, NULL) 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 struct attribute_group capability_attr_grp = { .attrs = capability_attrs, }; static ssize_t show_TermChar(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 store_TermChar(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(TermChar, S_IRUGO, show_TermChar, store_TermChar); #define data_attribute(name) \ static ssize_t show_##name(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 store_##name(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(name, S_IRUGO, show_##name, store_##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 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; } static long usbtmc_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { struct usbtmc_device_data *data; int retval = -EBADRQC; data = file->private_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; } skip_io_on_zombie: mutex_unlock(&data->io_mutex); return retval; } 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, .llseek = default_llseek, }; static struct usb_class_driver usbtmc_class = { .name = "usbtmc%d", .fops = &fops, .minor_base = USBTMC_MINOR_BASE, }; 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 *endpoint; int n; int retcode; dev_dbg(&intf->dev, "%s called\n", __func__); data = kmalloc(sizeof(struct usbtmc_device_data), GFP_KERNEL); if (!data) { dev_err(&intf->dev, "Unable to allocate kernel memory\n"); 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); data->zombie = 0; /* Initialize USBTMC bTag and other fields */ data->bTag = 1; data->TermCharEnabled = 0; data->TermChar = '\n'; /* USBTMC devices have only one setting, so use that */ iface_desc = data->intf->cur_altsetting; /* Find bulk in endpoint */ for (n = 0; n < iface_desc->desc.bNumEndpoints; n++) { endpoint = &iface_desc->endpoint[n].desc; if (usb_endpoint_is_bulk_in(endpoint)) { data->bulk_in = endpoint->bEndpointAddress; dev_dbg(&intf->dev, "Found bulk in endpoint at %u\n", data->bulk_in); break; } } /* Find bulk out endpoint */ for (n = 0; n < iface_desc->desc.bNumEndpoints; n++) { endpoint = &iface_desc->endpoint[n].desc; if (usb_endpoint_is_bulk_out(endpoint)) { data->bulk_out = endpoint->bEndpointAddress; dev_dbg(&intf->dev, "Found Bulk out endpoint at %u\n", data->bulk_out); break; } } 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); 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); kref_put(&data->kref, usbtmc_delete); return retcode; } static void usbtmc_disconnect(struct usb_interface *intf) { struct usbtmc_device_data *data; dev_dbg(&intf->dev, "usbtmc_disconnect called\n"); 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; mutex_unlock(&data->io_mutex); 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, }; static int __init usbtmc_init(void) { int retcode; retcode = usb_register(&usbtmc_driver); if (retcode) printk(KERN_ERR KBUILD_MODNAME": Unable to register driver\n"); return retcode; } module_init(usbtmc_init); static void __exit usbtmc_exit(void) { usb_deregister(&usbtmc_driver); } module_exit(usbtmc_exit); MODULE_LICENSE("GPL");