diff options
Diffstat (limited to 'drivers/usb/misc')
| -rw-r--r-- | drivers/usb/misc/Kconfig | 13 | ||||
| -rw-r--r-- | drivers/usb/misc/Makefile | 1 | ||||
| -rw-r--r-- | drivers/usb/misc/appledisplay.c | 2 | ||||
| -rw-r--r-- | drivers/usb/misc/chaoskey.c | 532 | ||||
| -rw-r--r-- | drivers/usb/misc/legousbtower.c | 6 | ||||
| -rw-r--r-- | drivers/usb/misc/usb3503.c | 47 |
6 files changed, 574 insertions, 27 deletions
diff --git a/drivers/usb/misc/Kconfig b/drivers/usb/misc/Kconfig index 76d77206e011..f7a7fc21be8a 100644 --- a/drivers/usb/misc/Kconfig +++ b/drivers/usb/misc/Kconfig @@ -255,3 +255,16 @@ config USB_LINK_LAYER_TEST This driver is for generating specific traffic for Super Speed Link Layer Test Device. Say Y only when you want to conduct USB Super Speed Link Layer Test for host controllers. + +config USB_CHAOSKEY + tristate "ChaosKey random number generator driver support" + depends on HW_RANDOM + help + Say Y here if you want to connect an AltusMetrum ChaosKey to + your computer's USB port. The ChaosKey is a hardware random + number generator which hooks into the kernel entropy pool to + ensure a large supply of entropy for /dev/random and + /dev/urandom and also provides direct access via /dev/chaoskeyX + + To compile this driver as a module, choose M here: the + module will be called chaoskey. diff --git a/drivers/usb/misc/Makefile b/drivers/usb/misc/Makefile index 65b0402c1ca1..45fd4ac39d3e 100644 --- a/drivers/usb/misc/Makefile +++ b/drivers/usb/misc/Makefile @@ -25,6 +25,7 @@ obj-$(CONFIG_USB_USS720) += uss720.o obj-$(CONFIG_USB_SEVSEG) += usbsevseg.o obj-$(CONFIG_USB_YUREX) += yurex.o obj-$(CONFIG_USB_HSIC_USB3503) += usb3503.o +obj-$(CONFIG_USB_CHAOSKEY) += chaoskey.o obj-$(CONFIG_USB_SISUSBVGA) += sisusbvga/ obj-$(CONFIG_USB_LINK_LAYER_TEST) += lvstest.o diff --git a/drivers/usb/misc/appledisplay.c b/drivers/usb/misc/appledisplay.c index b3d245ef46ef..a0a3827b4aff 100644 --- a/drivers/usb/misc/appledisplay.c +++ b/drivers/usb/misc/appledisplay.c @@ -329,7 +329,7 @@ error: pdata->urbdata, pdata->urb->transfer_dma); usb_free_urb(pdata->urb); } - if (pdata->bd && !IS_ERR(pdata->bd)) + if (!IS_ERR(pdata->bd)) backlight_device_unregister(pdata->bd); kfree(pdata->msgdata); } diff --git a/drivers/usb/misc/chaoskey.c b/drivers/usb/misc/chaoskey.c new file mode 100644 index 000000000000..3ad5d19e4d04 --- /dev/null +++ b/drivers/usb/misc/chaoskey.c @@ -0,0 +1,532 @@ +/* + * chaoskey - driver for ChaosKey device from Altus Metrum. + * + * This device provides true random numbers using a noise source based + * on a reverse-biased p-n junction in avalanche breakdown. More + * details can be found at http://chaoskey.org + * + * The driver connects to the kernel hardware RNG interface to provide + * entropy for /dev/random and other kernel activities. It also offers + * a separate /dev/ entry to allow for direct access to the random + * bit stream. + * + * Copyright © 2015 Keith Packard <keithp@keithp.com> + * + * 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; version 2 of the License. + * + * 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. + */ + +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/usb.h> +#include <linux/wait.h> +#include <linux/hw_random.h> +#include <linux/mutex.h> +#include <linux/uaccess.h> + +static struct usb_driver chaoskey_driver; +static struct usb_class_driver chaoskey_class; +static int chaoskey_rng_read(struct hwrng *rng, void *data, + size_t max, bool wait); + +#define usb_dbg(usb_if, format, arg...) \ + dev_dbg(&(usb_if)->dev, format, ## arg) + +#define usb_err(usb_if, format, arg...) \ + dev_err(&(usb_if)->dev, format, ## arg) + +/* Version Information */ +#define DRIVER_VERSION "v0.1" +#define DRIVER_AUTHOR "Keith Packard, keithp@keithp.com" +#define DRIVER_DESC "Altus Metrum ChaosKey driver" +#define DRIVER_SHORT "chaoskey" + +MODULE_VERSION(DRIVER_VERSION); +MODULE_AUTHOR(DRIVER_AUTHOR); +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_LICENSE("GPL"); + +#define CHAOSKEY_VENDOR_ID 0x1d50 /* OpenMoko */ +#define CHAOSKEY_PRODUCT_ID 0x60c6 /* ChaosKey */ + +#define CHAOSKEY_BUF_LEN 64 /* max size of USB full speed packet */ + +#define NAK_TIMEOUT (HZ) /* stall/wait timeout for device */ + +#ifdef CONFIG_USB_DYNAMIC_MINORS +#define USB_CHAOSKEY_MINOR_BASE 0 +#else + +/* IOWARRIOR_MINOR_BASE + 16, not official yet */ +#define USB_CHAOSKEY_MINOR_BASE 224 +#endif + +static const struct usb_device_id chaoskey_table[] = { + { USB_DEVICE(CHAOSKEY_VENDOR_ID, CHAOSKEY_PRODUCT_ID) }, + { }, +}; +MODULE_DEVICE_TABLE(usb, chaoskey_table); + +/* Driver-local specific stuff */ +struct chaoskey { + struct usb_interface *interface; + char in_ep; + struct mutex lock; + struct mutex rng_lock; + int open; /* open count */ + int present; /* device not disconnected */ + int size; /* size of buf */ + int valid; /* bytes of buf read */ + int used; /* bytes of buf consumed */ + char *name; /* product + serial */ + struct hwrng hwrng; /* Embedded struct for hwrng */ + int hwrng_registered; /* registered with hwrng API */ + wait_queue_head_t wait_q; /* for timeouts */ + char *buf; +}; + +static void chaoskey_free(struct chaoskey *dev) +{ + usb_dbg(dev->interface, "free"); + kfree(dev->name); + kfree(dev->buf); + kfree(dev); +} + +static int chaoskey_probe(struct usb_interface *interface, + const struct usb_device_id *id) +{ + struct usb_device *udev = interface_to_usbdev(interface); + struct usb_host_interface *altsetting = interface->cur_altsetting; + int i; + int in_ep = -1; + struct chaoskey *dev; + int result; + int size; + + usb_dbg(interface, "probe %s-%s", udev->product, udev->serial); + + /* Find the first bulk IN endpoint and its packet size */ + for (i = 0; i < altsetting->desc.bNumEndpoints; i++) { + if (usb_endpoint_is_bulk_in(&altsetting->endpoint[i].desc)) { + in_ep = usb_endpoint_num(&altsetting->endpoint[i].desc); + size = usb_endpoint_maxp(&altsetting->endpoint[i].desc); + break; + } + } + + /* Validate endpoint and size */ + if (in_ep == -1) { + usb_dbg(interface, "no IN endpoint found"); + return -ENODEV; + } + if (size <= 0) { + usb_dbg(interface, "invalid size (%d)", size); + return -ENODEV; + } + + if (size > CHAOSKEY_BUF_LEN) { + usb_dbg(interface, "size reduced from %d to %d\n", + size, CHAOSKEY_BUF_LEN); + size = CHAOSKEY_BUF_LEN; + } + + /* Looks good, allocate and initialize */ + + dev = kzalloc(sizeof(struct chaoskey), GFP_KERNEL); + + if (dev == NULL) + return -ENOMEM; + + dev->buf = kmalloc(size, GFP_KERNEL); + + if (dev->buf == NULL) { + kfree(dev); + return -ENOMEM; + } + + /* Construct a name using the product and serial values. Each + * device needs a unique name for the hwrng code + */ + + if (udev->product && udev->serial) { + dev->name = kmalloc(strlen(udev->product) + 1 + + strlen(udev->serial) + 1, GFP_KERNEL); + if (dev->name == NULL) { + kfree(dev->buf); + kfree(dev); + return -ENOMEM; + } + + strcpy(dev->name, udev->product); + strcat(dev->name, "-"); + strcat(dev->name, udev->serial); + } + + dev->interface = interface; + + dev->in_ep = in_ep; + + dev->size = size; + dev->present = 1; + + init_waitqueue_head(&dev->wait_q); + + mutex_init(&dev->lock); + mutex_init(&dev->rng_lock); + + usb_set_intfdata(interface, dev); + + result = usb_register_dev(interface, &chaoskey_class); + if (result) { + usb_err(interface, "Unable to allocate minor number."); + usb_set_intfdata(interface, NULL); + chaoskey_free(dev); + return result; + } + + dev->hwrng.name = dev->name ? dev->name : chaoskey_driver.name; + dev->hwrng.read = chaoskey_rng_read; + + /* Set the 'quality' metric. Quality is measured in units of + * 1/1024's of a bit ("mills"). This should be set to 1024, + * but there is a bug in the hwrng core which masks it with + * 1023. + * + * The patch that has been merged to the crypto development + * tree for that bug limits the value to 1024 at most, so by + * setting this to 1024 + 1023, we get 1023 before the fix is + * merged and 1024 afterwards. We'll patch this driver once + * both bits of code are in the same tree. + */ + dev->hwrng.quality = 1024 + 1023; + + dev->hwrng_registered = (hwrng_register(&dev->hwrng) == 0); + if (!dev->hwrng_registered) + usb_err(interface, "Unable to register with hwrng"); + + usb_enable_autosuspend(udev); + + usb_dbg(interface, "chaoskey probe success, size %d", dev->size); + return 0; +} + +static void chaoskey_disconnect(struct usb_interface *interface) +{ + struct chaoskey *dev; + + usb_dbg(interface, "disconnect"); + dev = usb_get_intfdata(interface); + if (!dev) { + usb_dbg(interface, "disconnect failed - no dev"); + return; + } + + if (dev->hwrng_registered) + hwrng_unregister(&dev->hwrng); + + usb_deregister_dev(interface, &chaoskey_class); + + usb_set_intfdata(interface, NULL); + mutex_lock(&dev->lock); + + dev->present = 0; + + if (!dev->open) { + mutex_unlock(&dev->lock); + chaoskey_free(dev); + } else + mutex_unlock(&dev->lock); + + usb_dbg(interface, "disconnect done"); +} + +static int chaoskey_open(struct inode *inode, struct file *file) +{ + struct chaoskey *dev; + struct usb_interface *interface; + + /* get the interface from minor number and driver information */ + interface = usb_find_interface(&chaoskey_driver, iminor(inode)); + if (!interface) + return -ENODEV; + + usb_dbg(interface, "open"); + + dev = usb_get_intfdata(interface); + if (!dev) { + usb_dbg(interface, "open (dev)"); + return -ENODEV; + } + + file->private_data = dev; + mutex_lock(&dev->lock); + ++dev->open; + mutex_unlock(&dev->lock); + + usb_dbg(interface, "open success"); + return 0; +} + +static int chaoskey_release(struct inode *inode, struct file *file) +{ + struct chaoskey *dev = file->private_data; + struct usb_interface *interface; + + if (dev == NULL) + return -ENODEV; + + interface = dev->interface; + + usb_dbg(interface, "release"); + + mutex_lock(&dev->lock); + + usb_dbg(interface, "open count at release is %d", dev->open); + + if (dev->open <= 0) { + usb_dbg(interface, "invalid open count (%d)", dev->open); + mutex_unlock(&dev->lock); + return -ENODEV; + } + + --dev->open; + + if (!dev->present) { + if (dev->open == 0) { + mutex_unlock(&dev->lock); + chaoskey_free(dev); + } else + mutex_unlock(&dev->lock); + } else + mutex_unlock(&dev->lock); + + usb_dbg(interface, "release success"); + return 0; +} + +/* Fill the buffer. Called with dev->lock held + */ +static int _chaoskey_fill(struct chaoskey *dev) +{ + DEFINE_WAIT(wait); + int result; + int this_read; + struct usb_device *udev = interface_to_usbdev(dev->interface); + + usb_dbg(dev->interface, "fill"); + + /* Return immediately if someone called before the buffer was + * empty */ + if (dev->valid != dev->used) { + usb_dbg(dev->interface, "not empty yet (valid %d used %d)", + dev->valid, dev->used); + return 0; + } + + /* Bail if the device has been removed */ + if (!dev->present) { + usb_dbg(dev->interface, "device not present"); + return -ENODEV; + } + + /* Make sure the device is awake */ + result = usb_autopm_get_interface(dev->interface); + if (result) { + usb_dbg(dev->interface, "wakeup failed (result %d)", result); + return result; + } + + result = usb_bulk_msg(udev, + usb_rcvbulkpipe(udev, dev->in_ep), + dev->buf, dev->size, &this_read, + NAK_TIMEOUT); + + /* Let the device go back to sleep eventually */ + usb_autopm_put_interface(dev->interface); + + if (result == 0) { + dev->valid = this_read; + dev->used = 0; + } + + usb_dbg(dev->interface, "bulk_msg result %d this_read %d", + result, this_read); + + return result; +} + +static ssize_t chaoskey_read(struct file *file, + char __user *buffer, + size_t count, + loff_t *ppos) +{ + struct chaoskey *dev; + ssize_t read_count = 0; + int this_time; + int result = 0; + unsigned long remain; + + dev = file->private_data; + + if (dev == NULL || !dev->present) + return -ENODEV; + + usb_dbg(dev->interface, "read %zu", count); + + while (count > 0) { + + /* Grab the rng_lock briefly to ensure that the hwrng interface + * gets priority over other user access + */ + result = mutex_lock_interruptible(&dev->rng_lock); + if (result) + goto bail; + mutex_unlock(&dev->rng_lock); + + result = mutex_lock_interruptible(&dev->lock); + if (result) + goto bail; + if (dev->valid == dev->used) { + result = _chaoskey_fill(dev); + if (result) { + mutex_unlock(&dev->lock); + goto bail; + } + + /* Read returned zero bytes */ + if (dev->used == dev->valid) { + mutex_unlock(&dev->lock); + goto bail; + } + } + + this_time = dev->valid - dev->used; + if (this_time > count) + this_time = count; + + remain = copy_to_user(buffer, dev->buf + dev->used, this_time); + if (remain) { + result = -EFAULT; + + /* Consume the bytes that were copied so we don't leak + * data to user space + */ + dev->used += this_time - remain; + mutex_unlock(&dev->lock); + goto bail; + } + + count -= this_time; + read_count += this_time; + buffer += this_time; + dev->used += this_time; + mutex_unlock(&dev->lock); + } +bail: + if (read_count) { + usb_dbg(dev->interface, "read %zu bytes", read_count); + return read_count; + } + usb_dbg(dev->interface, "empty read, result %d", result); + return result; +} + +static int chaoskey_rng_read(struct hwrng *rng, void *data, + size_t max, bool wait) +{ + struct chaoskey *dev = container_of(rng, struct chaoskey, hwrng); + int this_time; + + usb_dbg(dev->interface, "rng_read max %zu wait %d", max, wait); + + if (!dev->present) { + usb_dbg(dev->interface, "device not present"); + return 0; + } + + /* Hold the rng_lock until we acquire the device lock so that + * this operation gets priority over other user access to the + * device + */ + mutex_lock(&dev->rng_lock); + + mutex_lock(&dev->lock); + + mutex_unlock(&dev->rng_lock); + + /* Try to fill the buffer if empty. It doesn't actually matter + * if _chaoskey_fill works; we'll just return zero bytes as + * the buffer will still be empty + */ + if (dev->valid == dev->used) + (void) _chaoskey_fill(dev); + + this_time = dev->valid - dev->used; + if (this_time > max) + this_time = max; + + memcpy(data, dev->buf, this_time); + + dev->used += this_time; + + mutex_unlock(&dev->lock); + + usb_dbg(dev->interface, "rng_read this_time %d\n", this_time); + return this_time; +} + +#ifdef CONFIG_PM +static int chaoskey_suspend(struct usb_interface *interface, + pm_message_t message) +{ + usb_dbg(interface, "suspend"); + return 0; +} + +static int chaoskey_resume(struct usb_interface *interface) +{ + usb_dbg(interface, "resume"); + return 0; +} +#else +#define chaoskey_suspend NULL +#define chaoskey_resume NULL +#endif + +/* file operation pointers */ +static const struct file_operations chaoskey_fops = { + .owner = THIS_MODULE, + .read = chaoskey_read, + .open = chaoskey_open, + .release = chaoskey_release, + .llseek = default_llseek, +}; + +/* class driver information */ +static struct usb_class_driver chaoskey_class = { + .name = "chaoskey%d", + .fops = &chaoskey_fops, + .minor_base = USB_CHAOSKEY_MINOR_BASE, +}; + +/* usb specific object needed to register this driver with the usb subsystem */ +static struct usb_driver chaoskey_driver = { + .name = DRIVER_SHORT, + .probe = chaoskey_probe, + .disconnect = chaoskey_disconnect, + .suspend = chaoskey_suspend, + .resume = chaoskey_resume, + .reset_resume = chaoskey_resume, + .id_table = chaoskey_table, + .supports_autosuspend = 1, +}; + +module_usb_driver(chaoskey_driver); + diff --git a/drivers/usb/misc/legousbtower.c b/drivers/usb/misc/legousbtower.c index 97cd9e24bd25..7771be3ac178 100644 --- a/drivers/usb/misc/legousbtower.c +++ b/drivers/usb/misc/legousbtower.c @@ -574,7 +574,7 @@ static ssize_t tower_read (struct file *file, char __user *buffer, size_t count, } if (read_timeout) { - timeout = jiffies + read_timeout * HZ / 1000; + timeout = jiffies + msecs_to_jiffies(read_timeout); } /* wait for data */ @@ -592,7 +592,7 @@ static ssize_t tower_read (struct file *file, char __user *buffer, size_t count, /* reset read timeout during read or write activity */ if (read_timeout && (dev->read_buffer_length || dev->interrupt_out_busy)) { - timeout = jiffies + read_timeout * HZ / 1000; + timeout = jiffies + msecs_to_jiffies(read_timeout); } /* check for read timeout */ if (read_timeout && time_after (jiffies, timeout)) { @@ -831,7 +831,7 @@ static int tower_probe (struct usb_interface *interface, const struct usb_device dev->read_buffer_length = 0; dev->read_packet_length = 0; spin_lock_init (&dev->read_buffer_lock); - dev->packet_timeout_jiffies = packet_timeout * HZ / 1000; + dev->packet_timeout_jiffies = msecs_to_jiffies(packet_timeout); dev->read_last_arrival = jiffies; init_waitqueue_head (&dev->read_wait); diff --git a/drivers/usb/misc/usb3503.c b/drivers/usb/misc/usb3503.c index 258d2f546e43..64ff5b91752d 100644 --- a/drivers/usb/misc/usb3503.c +++ b/drivers/usb/misc/usb3503.c @@ -186,8 +186,31 @@ static int usb3503_probe(struct usb3503 *hub) hub->mode = pdata->initial_mode; } else if (np) { struct clk *clk; + u32 rate = 0; hub->port_off_mask = 0; + if (!of_property_read_u32(np, "refclk-frequency", &rate)) { + switch (rate) { + case 38400000: + case 26000000: + case 19200000: + case 12000000: + hub->secondary_ref_clk = 0; + break; + case 24000000: + case 27000000: + case 25000000: + case 50000000: + hub->secondary_ref_clk = 1; + break; + default: + dev_err(dev, + "unsupported reference clock rate (%d)\n", + (int) rate); + return -EINVAL; + } + } + clk = devm_clk_get(dev, "refclk"); if (IS_ERR(clk) && PTR_ERR(clk) != -ENOENT) { dev_err(dev, "unable to request refclk (%ld)\n", @@ -196,31 +219,9 @@ static int usb3503_probe(struct usb3503 *hub) } if (!IS_ERR(clk)) { - u32 rate = 0; hub->clk = clk; - if (!of_property_read_u32(np, "refclk-frequency", - &rate)) { - - switch (rate) { - case 38400000: - case 26000000: - case 19200000: - case 12000000: - hub->secondary_ref_clk = 0; - break; - case 24000000: - case 27000000: - case 25000000: - case 50000000: - hub->secondary_ref_clk = 1; - break; - default: - dev_err(dev, - "unsupported reference clock rate (%d)\n", - (int) rate); - return -EINVAL; - } + if (rate != 0) { err = clk_set_rate(hub->clk, rate); if (err) { dev_err(dev, |