/* ZD1211 USB-WLAN driver for Linux * * Copyright (C) 2005-2007 Ulrich Kunitz * Copyright (C) 2006-2007 Daniel Drake * Copyright (C) 2006-2007 Michael Wu * * 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. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include #include #include #include #include #include #include #include #include #include #include #include #include "zd_def.h" #include "zd_mac.h" #include "zd_usb.h" static struct usb_device_id usb_ids[] = { /* ZD1211 */ { USB_DEVICE(0x0105, 0x145f), .driver_info = DEVICE_ZD1211 }, { USB_DEVICE(0x0586, 0x3401), .driver_info = DEVICE_ZD1211 }, { USB_DEVICE(0x0586, 0x3402), .driver_info = DEVICE_ZD1211 }, { USB_DEVICE(0x0586, 0x3407), .driver_info = DEVICE_ZD1211 }, { USB_DEVICE(0x0586, 0x3409), .driver_info = DEVICE_ZD1211 }, { USB_DEVICE(0x079b, 0x004a), .driver_info = DEVICE_ZD1211 }, { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211 }, { USB_DEVICE(0x0ace, 0x1211), .driver_info = DEVICE_ZD1211 }, { USB_DEVICE(0x0ace, 0xa211), .driver_info = DEVICE_ZD1211 }, { USB_DEVICE(0x0b05, 0x170c), .driver_info = DEVICE_ZD1211 }, { USB_DEVICE(0x0b3b, 0x1630), .driver_info = DEVICE_ZD1211 }, { USB_DEVICE(0x0b3b, 0x5630), .driver_info = DEVICE_ZD1211 }, { USB_DEVICE(0x0df6, 0x9071), .driver_info = DEVICE_ZD1211 }, { USB_DEVICE(0x0df6, 0x9075), .driver_info = DEVICE_ZD1211 }, { USB_DEVICE(0x126f, 0xa006), .driver_info = DEVICE_ZD1211 }, { USB_DEVICE(0x129b, 0x1666), .driver_info = DEVICE_ZD1211 }, { USB_DEVICE(0x13b1, 0x001e), .driver_info = DEVICE_ZD1211 }, { USB_DEVICE(0x1435, 0x0711), .driver_info = DEVICE_ZD1211 }, { USB_DEVICE(0x14ea, 0xab10), .driver_info = DEVICE_ZD1211 }, { USB_DEVICE(0x14ea, 0xab13), .driver_info = DEVICE_ZD1211 }, { USB_DEVICE(0x157e, 0x300a), .driver_info = DEVICE_ZD1211 }, { USB_DEVICE(0x157e, 0x300b), .driver_info = DEVICE_ZD1211 }, { USB_DEVICE(0x157e, 0x3204), .driver_info = DEVICE_ZD1211 }, { USB_DEVICE(0x157e, 0x3207), .driver_info = DEVICE_ZD1211 }, { USB_DEVICE(0x1740, 0x2000), .driver_info = DEVICE_ZD1211 }, { USB_DEVICE(0x6891, 0xa727), .driver_info = DEVICE_ZD1211 }, /* ZD1211B */ { USB_DEVICE(0x0053, 0x5301), .driver_info = DEVICE_ZD1211B }, { USB_DEVICE(0x0409, 0x0248), .driver_info = DEVICE_ZD1211B }, { USB_DEVICE(0x0411, 0x00da), .driver_info = DEVICE_ZD1211B }, { USB_DEVICE(0x0471, 0x1236), .driver_info = DEVICE_ZD1211B }, { USB_DEVICE(0x0471, 0x1237), .driver_info = DEVICE_ZD1211B }, { USB_DEVICE(0x050d, 0x705c), .driver_info = DEVICE_ZD1211B }, { USB_DEVICE(0x054c, 0x0257), .driver_info = DEVICE_ZD1211B }, { USB_DEVICE(0x0586, 0x340a), .driver_info = DEVICE_ZD1211B }, { USB_DEVICE(0x0586, 0x340f), .driver_info = DEVICE_ZD1211B }, { USB_DEVICE(0x0586, 0x3410), .driver_info = DEVICE_ZD1211B }, { USB_DEVICE(0x0586, 0x3412), .driver_info = DEVICE_ZD1211B }, { USB_DEVICE(0x0586, 0x3413), .driver_info = DEVICE_ZD1211B }, { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B }, { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211B }, { USB_DEVICE(0x07fa, 0x1196), .driver_info = DEVICE_ZD1211B }, { USB_DEVICE(0x083a, 0x4505), .driver_info = DEVICE_ZD1211B }, { USB_DEVICE(0x083a, 0xe501), .driver_info = DEVICE_ZD1211B }, { USB_DEVICE(0x083a, 0xe503), .driver_info = DEVICE_ZD1211B }, { USB_DEVICE(0x083a, 0xe506), .driver_info = DEVICE_ZD1211B }, { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B }, { USB_DEVICE(0x0ace, 0xb215), .driver_info = DEVICE_ZD1211B }, { USB_DEVICE(0x0b05, 0x171b), .driver_info = DEVICE_ZD1211B }, { USB_DEVICE(0x0baf, 0x0121), .driver_info = DEVICE_ZD1211B }, { USB_DEVICE(0x0cde, 0x001a), .driver_info = DEVICE_ZD1211B }, { USB_DEVICE(0x0df6, 0x0036), .driver_info = DEVICE_ZD1211B }, { USB_DEVICE(0x129b, 0x1667), .driver_info = DEVICE_ZD1211B }, { USB_DEVICE(0x13b1, 0x0024), .driver_info = DEVICE_ZD1211B }, { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B }, { USB_DEVICE(0x1582, 0x6003), .driver_info = DEVICE_ZD1211B }, { USB_DEVICE(0x2019, 0x5303), .driver_info = DEVICE_ZD1211B }, { USB_DEVICE(0x2019, 0xed01), .driver_info = DEVICE_ZD1211B }, /* "Driverless" devices that need ejecting */ { USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER }, { USB_DEVICE(0x0ace, 0x20ff), .driver_info = DEVICE_INSTALLER }, {} }; MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip."); MODULE_AUTHOR("Ulrich Kunitz"); MODULE_AUTHOR("Daniel Drake"); MODULE_VERSION("1.0"); MODULE_DEVICE_TABLE(usb, usb_ids); #define FW_ZD1211_PREFIX "zd1211/zd1211_" #define FW_ZD1211B_PREFIX "zd1211/zd1211b_" static bool check_read_regs(struct zd_usb *usb, struct usb_req_read_regs *req, unsigned int count); /* USB device initialization */ static void int_urb_complete(struct urb *urb); static int request_fw_file( const struct firmware **fw, const char *name, struct device *device) { int r; dev_dbg_f(device, "fw name %s\n", name); r = request_firmware(fw, name, device); if (r) dev_err(device, "Could not load firmware file %s. Error number %d\n", name, r); return r; } static inline u16 get_bcdDevice(const struct usb_device *udev) { return le16_to_cpu(udev->descriptor.bcdDevice); } enum upload_code_flags { REBOOT = 1, }; /* Ensures that MAX_TRANSFER_SIZE is even. */ #define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1) static int upload_code(struct usb_device *udev, const u8 *data, size_t size, u16 code_offset, int flags) { u8 *p; int r; /* USB request blocks need "kmalloced" buffers. */ p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL); if (!p) { dev_err(&udev->dev, "out of memory\n"); r = -ENOMEM; goto error; } size &= ~1; while (size > 0) { size_t transfer_size = size <= MAX_TRANSFER_SIZE ? size : MAX_TRANSFER_SIZE; dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size); memcpy(p, data, transfer_size); r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), USB_REQ_FIRMWARE_DOWNLOAD, USB_DIR_OUT | USB_TYPE_VENDOR, code_offset, 0, p, transfer_size, 1000 /* ms */); if (r < 0) { dev_err(&udev->dev, "USB control request for firmware upload" " failed. Error number %d\n", r); goto error; } transfer_size = r & ~1; size -= transfer_size; data += transfer_size; code_offset += transfer_size/sizeof(u16); } if (flags & REBOOT) { u8 ret; /* Use "DMA-aware" buffer. */ r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), USB_REQ_FIRMWARE_CONFIRM, USB_DIR_IN | USB_TYPE_VENDOR, 0, 0, p, sizeof(ret), 5000 /* ms */); if (r != sizeof(ret)) { dev_err(&udev->dev, "control request firmeware confirmation failed." " Return value %d\n", r); if (r >= 0) r = -ENODEV; goto error; } ret = p[0]; if (ret & 0x80) { dev_err(&udev->dev, "Internal error while downloading." " Firmware confirm return value %#04x\n", (unsigned int)ret); r = -ENODEV; goto error; } dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n", (unsigned int)ret); } r = 0; error: kfree(p); return r; } static u16 get_word(const void *data, u16 offset) { const __le16 *p = data; return le16_to_cpu(p[offset]); } static char *get_fw_name(struct zd_usb *usb, char *buffer, size_t size, const char* postfix) { scnprintf(buffer, size, "%s%s", usb->is_zd1211b ? FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX, postfix); return buffer; } static int handle_version_mismatch(struct zd_usb *usb, const struct firmware *ub_fw) { struct usb_device *udev = zd_usb_to_usbdev(usb); const struct firmware *ur_fw = NULL; int offset; int r = 0; char fw_name[128]; r = request_fw_file(&ur_fw, get_fw_name(usb, fw_name, sizeof(fw_name), "ur"), &udev->dev); if (r) goto error; r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START, REBOOT); if (r) goto error; offset = (E2P_BOOT_CODE_OFFSET * sizeof(u16)); r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset, E2P_START + E2P_BOOT_CODE_OFFSET, REBOOT); /* At this point, the vendor driver downloads the whole firmware * image, hacks around with version IDs, and uploads it again, * completely overwriting the boot code. We do not do this here as * it is not required on any tested devices, and it is suspected to * cause problems. */ error: release_firmware(ur_fw); return r; } static int upload_firmware(struct zd_usb *usb) { int r; u16 fw_bcdDevice; u16 bcdDevice; struct usb_device *udev = zd_usb_to_usbdev(usb); const struct firmware *ub_fw = NULL; const struct firmware *uph_fw = NULL; char fw_name[128]; bcdDevice = get_bcdDevice(udev); r = request_fw_file(&ub_fw, get_fw_name(usb, fw_name, sizeof(fw_name), "ub"), &udev->dev); if (r) goto error; fw_bcdDevice = get_word(ub_fw->data, E2P_DATA_OFFSET); if (fw_bcdDevice != bcdDevice) { dev_info(&udev->dev, "firmware version %#06x and device bootcode version " "%#06x differ\n", fw_bcdDevice, bcdDevice); if (bcdDevice <= 0x4313) dev_warn(&udev->dev, "device has old bootcode, please " "report success or failure\n"); r = handle_version_mismatch(usb, ub_fw); if (r) goto error; } else { dev_dbg_f(&udev->dev, "firmware device id %#06x is equal to the " "actual device id\n", fw_bcdDevice); } r = request_fw_file(&uph_fw, get_fw_name(usb, fw_name, sizeof(fw_name), "uphr"), &udev->dev); if (r) goto error; r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START, REBOOT); if (r) { dev_err(&udev->dev, "Could not upload firmware code uph. Error number %d\n", r); } /* FALL-THROUGH */ error: release_firmware(ub_fw); release_firmware(uph_fw); return r; } MODULE_FIRMWARE(FW_ZD1211B_PREFIX "ur"); MODULE_FIRMWARE(FW_ZD1211_PREFIX "ur"); MODULE_FIRMWARE(FW_ZD1211B_PREFIX "ub"); MODULE_FIRMWARE(FW_ZD1211_PREFIX "ub"); MODULE_FIRMWARE(FW_ZD1211B_PREFIX "uphr"); MODULE_FIRMWARE(FW_ZD1211_PREFIX "uphr"); /* Read data from device address space using "firmware interface" which does * not require firmware to be loaded. */ int zd_usb_read_fw(struct zd_usb *usb, zd_addr_t addr, u8 *data, u16 len) { int r; struct usb_device *udev = zd_usb_to_usbdev(usb); u8 *buf; /* Use "DMA-aware" buffer. */ buf = kmalloc(len, GFP_KERNEL); if (!buf) return -ENOMEM; r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), USB_REQ_FIRMWARE_READ_DATA, USB_DIR_IN | 0x40, addr, 0, buf, len, 5000); if (r < 0) { dev_err(&udev->dev, "read over firmware interface failed: %d\n", r); goto exit; } else if (r != len) { dev_err(&udev->dev, "incomplete read over firmware interface: %d/%d\n", r, len); r = -EIO; goto exit; } r = 0; memcpy(data, buf, len); exit: kfree(buf); return r; } #define urb_dev(urb) (&(urb)->dev->dev) static inline void handle_regs_int_override(struct urb *urb) { struct zd_usb *usb = urb->context; struct zd_usb_interrupt *intr = &usb->intr; spin_lock(&intr->lock); if (atomic_read(&intr->read_regs_enabled)) { atomic_set(&intr->read_regs_enabled, 0); intr->read_regs_int_overridden = 1; complete(&intr->read_regs.completion); } spin_unlock(&intr->lock); } static inline void handle_regs_int(struct urb *urb) { struct zd_usb *usb = urb->context; struct zd_usb_interrupt *intr = &usb->intr; int len; u16 int_num; ZD_ASSERT(in_interrupt()); spin_lock(&intr->lock); int_num = le16_to_cpu(*(__le16 *)(urb->transfer_buffer+2)); if (int_num == CR_INTERRUPT) { struct zd_mac *mac = zd_hw_mac(zd_usb_to_hw(urb->context)); spin_lock(&mac->lock); memcpy(&mac->intr_buffer, urb->transfer_buffer, USB_MAX_EP_INT_BUFFER); spin_unlock(&mac->lock); schedule_work(&mac->process_intr); } else if (atomic_read(&intr->read_regs_enabled)) { len = urb->actual_length; intr->read_regs.length = urb->actual_length; if (len > sizeof(intr->read_regs.buffer)) len = sizeof(intr->read_regs.buffer); memcpy(intr->read_regs.buffer, urb->transfer_buffer, len); /* Sometimes USB_INT_ID_REGS is not overridden, but comes after * USB_INT_ID_RETRY_FAILED. Read-reg retry then gets this * delayed USB_INT_ID_REGS, but leaves USB_INT_ID_REGS of * retry unhandled. Next read-reg command then might catch * this wrong USB_INT_ID_REGS. Fix by ignoring wrong reads. */ if (!check_read_regs(usb, intr->read_regs.req, intr->read_regs.req_count)) goto out; atomic_set(&intr->read_regs_enabled, 0); intr->read_regs_int_overridden = 0; complete(&intr->read_regs.completion); goto out; } out: spin_unlock(&intr->lock); /* CR_INTERRUPT might override read_reg too. */ if (int_num == CR_INTERRUPT && atomic_read(&intr->read_regs_enabled)) handle_regs_int_override(urb); } static void int_urb_complete(struct urb *urb) { int r; struct usb_int_header *hdr; struct zd_usb *usb; struct zd_usb_interrupt *intr; switch (urb->status) { case 0: break; case -ESHUTDOWN: case -EINVAL: case -ENODEV: case -ENOENT: case -ECONNRESET: case -EPIPE: dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status); return; default: dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status); goto resubmit; } if (urb->actual_length < sizeof(hdr)) { dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb); goto resubmit; } hdr = urb->transfer_buffer; if (hdr->type != USB_INT_TYPE) { dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb); goto resubmit; } /* USB_INT_ID_RETRY_FAILED triggered by tx-urb submit can override * pending USB_INT_ID_REGS causing read command timeout. */ usb = urb->context; intr = &usb->intr; if (hdr->id != USB_INT_ID_REGS && atomic_read(&intr->read_regs_enabled)) handle_regs_int_override(urb); switch (hdr->id) { case USB_INT_ID_REGS: handle_regs_int(urb); break; case USB_INT_ID_RETRY_FAILED: zd_mac_tx_failed(urb); break; default: dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb, (unsigned int)hdr->id); goto resubmit; } resubmit: r = usb_submit_urb(urb, GFP_ATOMIC); if (r) { dev_dbg_f(urb_dev(urb), "error: resubmit urb %p err code %d\n", urb, r); /* TODO: add worker to reset intr->urb */ } return; } static inline int int_urb_interval(struct usb_device *udev) { switch (udev->speed) { case USB_SPEED_HIGH: return 4; case USB_SPEED_LOW: return 10; case USB_SPEED_FULL: default: return 1; } } static inline int usb_int_enabled(struct zd_usb *usb) { unsigned long flags; struct zd_usb_interrupt *intr = &usb->intr; struct urb *urb; spin_lock_irqsave(&intr->lock, flags); urb = intr->urb; spin_unlock_irqrestore(&intr->lock, flags); return urb != NULL; } int zd_usb_enable_int(struct zd_usb *usb) { int r; struct usb_device *udev = zd_usb_to_usbdev(usb); struct zd_usb_interrupt *intr = &usb->intr; struct urb *urb; dev_dbg_f(zd_usb_dev(usb), "\n"); urb = usb_alloc_urb(0, GFP_KERNEL); if (!urb) { r = -ENOMEM; goto out; } ZD_ASSERT(!irqs_disabled()); spin_lock_irq(&intr->lock); if (intr->urb) { spin_unlock_irq(&intr->lock); r = 0; goto error_free_urb; } intr->urb = urb; spin_unlock_irq(&intr->lock); r = -ENOMEM; intr->buffer = usb_alloc_coherent(udev, USB_MAX_EP_INT_BUFFER, GFP_KERNEL, &intr->buffer_dma); if (!intr->buffer) { dev_dbg_f(zd_usb_dev(usb), "couldn't allocate transfer_buffer\n"); goto error_set_urb_null; } usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN), intr->buffer, USB_MAX_EP_INT_BUFFER, int_urb_complete, usb, intr->interval); urb->transfer_dma = intr->buffer_dma; urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb); r = usb_submit_urb(urb, GFP_KERNEL); if (r) { dev_dbg_f(zd_usb_dev(usb), "Couldn't submit urb. Error number %d\n", r); goto error; } return 0; error: usb_free_coherent(udev, USB_MAX_EP_INT_BUFFER, intr->buffer, intr->buffer_dma); error_set_urb_null: spin_lock_irq(&intr->lock); intr->urb = NULL; spin_unlock_irq(&intr->lock); error_free_urb: usb_free_urb(urb); out: return r; } void zd_usb_disable_int(struct zd_usb *usb) { unsigned long flags; struct usb_device *udev = zd_usb_to_usbdev(usb); struct zd_usb_interrupt *intr = &usb->intr; struct urb *urb; void *buffer; dma_addr_t buffer_dma; spin_lock_irqsave(&intr->lock, flags); urb = intr->urb; if (!urb) { spin_unlock_irqrestore(&intr->lock, flags); return; } intr->urb = NULL; buffer = intr->buffer; buffer_dma = intr->buffer_dma; intr->buffer = NULL; spin_unlock_irqrestore(&intr->lock, flags); usb_kill_urb(urb); dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb); usb_free_urb(urb); if (buffer) usb_free_coherent(udev, USB_MAX_EP_INT_BUFFER, buffer, buffer_dma); } static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer, unsigned int length) { int i; const struct rx_length_info *length_info; if (length < sizeof(struct rx_length_info)) { /* It's not a complete packet anyhow. */ dev_dbg_f(zd_usb_dev(usb), "invalid, small RX packet : %d\n", length); return; } length_info = (struct rx_length_info *) (buffer + length - sizeof(struct rx_length_info)); /* It might be that three frames are merged into a single URB * transaction. We have to check for the length info tag. * * While testing we discovered that length_info might be unaligned, * because if USB transactions are merged, the last packet will not * be padded. Unaligned access might also happen if the length_info * structure is not present. */ if (get_unaligned_le16(&length_info->tag) == RX_LENGTH_INFO_TAG) { unsigned int l, k, n; for (i = 0, l = 0;; i++) { k = get_unaligned_le16(&length_info->length[i]); if (k == 0) return; n = l+k; if (n > length) return; zd_mac_rx(zd_usb_to_hw(usb), buffer+l, k); if (i >= 2) return; l = (n+3) & ~3; } } else { zd_mac_rx(zd_usb_to_hw(usb), buffer, length); } } static void rx_urb_complete(struct urb *urb) { int r; struct zd_usb *usb; struct zd_usb_rx *rx; const u8 *buffer; unsigned int length; switch (urb->status) { case 0: break; case -ESHUTDOWN: case -EINVAL: case -ENODEV: case -ENOENT: case -ECONNRESET: case -EPIPE: dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status); return; default: dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status); goto resubmit; } buffer = urb->transfer_buffer; length = urb->actual_length; usb = urb->context; rx = &usb->rx; tasklet_schedule(&rx->reset_timer_tasklet); if (length%rx->usb_packet_size > rx->usb_packet_size-4) { /* If there is an old first fragment, we don't care. */ dev_dbg_f(urb_dev(urb), "*** first fragment ***\n"); ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment)); spin_lock(&rx->lock); memcpy(rx->fragment, buffer, length); rx->fragment_length = length; spin_unlock(&rx->lock); goto resubmit; } spin_lock(&rx->lock); if (rx->fragment_length > 0) { /* We are on a second fragment, we believe */ ZD_ASSERT(length + rx->fragment_length <= ARRAY_SIZE(rx->fragment)); dev_dbg_f(urb_dev(urb), "*** second fragment ***\n"); memcpy(rx->fragment+rx->fragment_length, buffer, length); handle_rx_packet(usb, rx->fragment, rx->fragment_length + length); rx->fragment_length = 0; spin_unlock(&rx->lock); } else { spin_unlock(&rx->lock); handle_rx_packet(usb, buffer, length); } resubmit: r = usb_submit_urb(urb, GFP_ATOMIC); if (r) dev_dbg_f(urb_dev(urb), "urb %p resubmit error %d\n", urb, r); } static struct urb *alloc_rx_urb(struct zd_usb *usb) { struct usb_device *udev = zd_usb_to_usbdev(usb); struct urb *urb; void *buffer; urb = usb_alloc_urb(0, GFP_KERNEL); if (!urb) return NULL; buffer = usb_alloc_coherent(udev, USB_MAX_RX_SIZE, GFP_KERNEL, &urb->transfer_dma); if (!buffer) { usb_free_urb(urb); return NULL; } usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN), buffer, USB_MAX_RX_SIZE, rx_urb_complete, usb); urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; return urb; } static void free_rx_urb(struct urb *urb) { if (!urb) return; usb_free_coherent(urb->dev, urb->transfer_buffer_length, urb->transfer_buffer, urb->transfer_dma); usb_free_urb(urb); } static int __zd_usb_enable_rx(struct zd_usb *usb) { int i, r; struct zd_usb_rx *rx = &usb->rx; struct urb **urbs; dev_dbg_f(zd_usb_dev(usb), "\n"); r = -ENOMEM; urbs = kcalloc(RX_URBS_COUNT, sizeof(struct urb *), GFP_KERNEL); if (!urbs) goto error; for (i = 0; i < RX_URBS_COUNT; i++) { urbs[i] = alloc_rx_urb(usb); if (!urbs[i]) goto error; } ZD_ASSERT(!irqs_disabled()); spin_lock_irq(&rx->lock); if (rx->urbs) { spin_unlock_irq(&rx->lock); r = 0; goto error; } rx->urbs = urbs; rx->urbs_count = RX_URBS_COUNT; spin_unlock_irq(&rx->lock); for (i = 0; i < RX_URBS_COUNT; i++) { r = usb_submit_urb(urbs[i], GFP_KERNEL); if (r) goto error_submit; } return 0; error_submit: for (i = 0; i < RX_URBS_COUNT; i++) { usb_kill_urb(urbs[i]); } spin_lock_irq(&rx->lock); rx->urbs = NULL; rx->urbs_count = 0; spin_unlock_irq(&rx->lock); error: if (urbs) { for (i = 0; i < RX_URBS_COUNT; i++) free_rx_urb(urbs[i]); } return r; } int zd_usb_enable_rx(struct zd_usb *usb) { int r; struct zd_usb_rx *rx = &usb->rx; mutex_lock(&rx->setup_mutex); r = __zd_usb_enable_rx(usb); mutex_unlock(&rx->setup_mutex); zd_usb_reset_rx_idle_timer(usb); return r; } static void __zd_usb_disable_rx(struct zd_usb *usb) { int i; unsigned long flags; struct urb **urbs; unsigned int count; struct zd_usb_rx *rx = &usb->rx; spin_lock_irqsave(&rx->lock, flags); urbs = rx->urbs; count = rx->urbs_count; spin_unlock_irqrestore(&rx->lock, flags); if (!urbs) return; for (i = 0; i < count; i++) { usb_kill_urb(urbs[i]); free_rx_urb(urbs[i]); } kfree(urbs); spin_lock_irqsave(&rx->lock, flags); rx->urbs = NULL; rx->urbs_count = 0; spin_unlock_irqrestore(&rx->lock, flags); } void zd_usb_disable_rx(struct zd_usb *usb) { struct zd_usb_rx *rx = &usb->rx; mutex_lock(&rx->setup_mutex); __zd_usb_disable_rx(usb); mutex_unlock(&rx->setup_mutex); tasklet_kill(&rx->reset_timer_tasklet); cancel_delayed_work_sync(&rx->idle_work); } static void zd_usb_reset_rx(struct zd_usb *usb) { bool do_reset; struct zd_usb_rx *rx = &usb->rx; unsigned long flags; mutex_lock(&rx->setup_mutex); spin_lock_irqsave(&rx->lock, flags); do_reset = rx->urbs != NULL; spin_unlock_irqrestore(&rx->lock, flags); if (do_reset) { __zd_usb_disable_rx(usb); __zd_usb_enable_rx(usb); } mutex_unlock(&rx->setup_mutex); if (do_reset) zd_usb_reset_rx_idle_timer(usb); } /** * zd_usb_disable_tx - disable transmission * @usb: the zd1211rw-private USB structure * * Frees all URBs in the free list and marks the transmission as disabled. */ void zd_usb_disable_tx(struct zd_usb *usb) { struct zd_usb_tx *tx = &usb->tx; unsigned long flags; atomic_set(&tx->enabled, 0); /* kill all submitted tx-urbs */ usb_kill_anchored_urbs(&tx->submitted); spin_lock_irqsave(&tx->lock, flags); WARN_ON(!skb_queue_empty(&tx->submitted_skbs)); WARN_ON(tx->submitted_urbs != 0); tx->submitted_urbs = 0; spin_unlock_irqrestore(&tx->lock, flags); /* The stopped state is ignored, relying on ieee80211_wake_queues() * in a potentionally following zd_usb_enable_tx(). */ } /** * zd_usb_enable_tx - enables transmission * @usb: a &struct zd_usb pointer * * This function enables transmission and prepares the &zd_usb_tx data * structure. */ void zd_usb_enable_tx(struct zd_usb *usb) { unsigned long flags; struct zd_usb_tx *tx = &usb->tx; spin_lock_irqsave(&tx->lock, flags); atomic_set(&tx->enabled, 1); tx->submitted_urbs = 0; ieee80211_wake_queues(zd_usb_to_hw(usb)); tx->stopped = 0; spin_unlock_irqrestore(&tx->lock, flags); } static void tx_dec_submitted_urbs(struct zd_usb *usb) { struct zd_usb_tx *tx = &usb->tx; unsigned long flags; spin_lock_irqsave(&tx->lock, flags); --tx->submitted_urbs; if (tx->stopped && tx->submitted_urbs <= ZD_USB_TX_LOW) { ieee80211_wake_queues(zd_usb_to_hw(usb)); tx->stopped = 0; } spin_unlock_irqrestore(&tx->lock, flags); } static void tx_inc_submitted_urbs(struct zd_usb *usb) { struct zd_usb_tx *tx = &usb->tx; unsigned long flags; spin_lock_irqsave(&tx->lock, flags); ++tx->submitted_urbs; if (!tx->stopped && tx->submitted_urbs > ZD_USB_TX_HIGH) { ieee80211_stop_queues(zd_usb_to_hw(usb)); tx->stopped = 1; } spin_unlock_irqrestore(&tx->lock, flags); } /** * tx_urb_complete - completes the execution of an URB * @urb: a URB * * This function is called if the URB has been transferred to a device or an * error has happened. */ static void tx_urb_complete(struct urb *urb) { int r; struct sk_buff *skb; struct ieee80211_tx_info *info; struct zd_usb *usb; struct zd_usb_tx *tx; skb = (struct sk_buff *)urb->context; info = IEEE80211_SKB_CB(skb); /* * grab 'usb' pointer before handing off the skb (since * it might be freed by zd_mac_tx_to_dev or mac80211) */ usb = &zd_hw_mac(info->rate_driver_data[0])->chip.usb; tx = &usb->tx; switch (urb->status) { case 0: break; case -ESHUTDOWN: case -EINVAL: case -ENODEV: case -ENOENT: case -ECONNRESET: case -EPIPE: dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status); break; default: dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status); goto resubmit; } free_urb: skb_unlink(skb, &usb->tx.submitted_skbs); zd_mac_tx_to_dev(skb, urb->status); usb_free_urb(urb); tx_dec_submitted_urbs(usb); return; resubmit: usb_anchor_urb(urb, &tx->submitted); r = usb_submit_urb(urb, GFP_ATOMIC); if (r) { usb_unanchor_urb(urb); dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r); goto free_urb; } } /** * zd_usb_tx: initiates transfer of a frame of the device * * @usb: the zd1211rw-private USB structure * @skb: a &struct sk_buff pointer * * This function tranmits a frame to the device. It doesn't wait for * completion. The frame must contain the control set and have all the * control set information available. * * The function returns 0 if the transfer has been successfully initiated. */ int zd_usb_tx(struct zd_usb *usb, struct sk_buff *skb) { int r; struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); struct usb_device *udev = zd_usb_to_usbdev(usb); struct urb *urb; struct zd_usb_tx *tx = &usb->tx; if (!atomic_read(&tx->enabled)) { r = -ENOENT; goto out; } urb = usb_alloc_urb(0, GFP_ATOMIC); if (!urb) { r = -ENOMEM; goto out; } usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT), skb->data, skb->len, tx_urb_complete, skb); info->rate_driver_data[1] = (void *)jiffies; skb_queue_tail(&tx->submitted_skbs, skb); usb_anchor_urb(urb, &tx->submitted); r = usb_submit_urb(urb, GFP_ATOMIC); if (r) { dev_dbg_f(zd_usb_dev(usb), "error submit urb %p %d\n", urb, r); usb_unanchor_urb(urb); skb_unlink(skb, &tx->submitted_skbs); goto error; } tx_inc_submitted_urbs(usb); return 0; error: usb_free_urb(urb); out: return r; } static bool zd_tx_timeout(struct zd_usb *usb) { struct zd_usb_tx *tx = &usb->tx; struct sk_buff_head *q = &tx->submitted_skbs; struct sk_buff *skb, *skbnext; struct ieee80211_tx_info *info; unsigned long flags, trans_start; bool have_timedout = false; spin_lock_irqsave(&q->lock, flags); skb_queue_walk_safe(q, skb, skbnext) { info = IEEE80211_SKB_CB(skb); trans_start = (unsigned long)info->rate_driver_data[1]; if (time_is_before_jiffies(trans_start + ZD_TX_TIMEOUT)) { have_timedout = true; break; } } spin_unlock_irqrestore(&q->lock, flags); return have_timedout; } static void zd_tx_watchdog_handler(struct work_struct *work) { struct zd_usb *usb = container_of(work, struct zd_usb, tx.watchdog_work.work); struct zd_usb_tx *tx = &usb->tx; if (!atomic_read(&tx->enabled) || !tx->watchdog_enabled) goto out; if (!zd_tx_timeout(usb)) goto out; /* TX halted, try reset */ dev_warn(zd_usb_dev(usb), "TX-stall detected, resetting device..."); usb_queue_reset_device(usb->intf); /* reset will stop this worker, don't rearm */ return; out: queue_delayed_work(zd_workqueue, &tx->watchdog_work, ZD_TX_WATCHDOG_INTERVAL); } void zd_tx_watchdog_enable(struct zd_usb *usb) { struct zd_usb_tx *tx = &usb->tx; if (!tx->watchdog_enabled) { dev_dbg_f(zd_usb_dev(usb), "\n"); queue_delayed_work(zd_workqueue, &tx->watchdog_work, ZD_TX_WATCHDOG_INTERVAL); tx->watchdog_enabled = 1; } } void zd_tx_watchdog_disable(struct zd_usb *usb) { struct zd_usb_tx *tx = &usb->tx; if (tx->watchdog_enabled) { dev_dbg_f(zd_usb_dev(usb), "\n"); tx->watchdog_enabled = 0; cancel_delayed_work_sync(&tx->watchdog_work); } } static void zd_rx_idle_timer_handler(struct work_struct *work) { struct zd_usb *usb = container_of(work, struct zd_usb, rx.idle_work.work); struct zd_mac *mac = zd_usb_to_mac(usb); if (!test_bit(ZD_DEVICE_RUNNING, &mac->flags)) return; dev_dbg_f(zd_usb_dev(usb), "\n"); /* 30 seconds since last rx, reset rx */ zd_usb_reset_rx(usb); } static void zd_usb_reset_rx_idle_timer_tasklet(unsigned long param) { struct zd_usb *usb = (struct zd_usb *)param; zd_usb_reset_rx_idle_timer(usb); } void zd_usb_reset_rx_idle_timer(struct zd_usb *usb) { struct zd_usb_rx *rx = &usb->rx; cancel_delayed_work(&rx->idle_work); queue_delayed_work(zd_workqueue, &rx->idle_work, ZD_RX_IDLE_INTERVAL); } static inline void init_usb_interrupt(struct zd_usb *usb) { struct zd_usb_interrupt *intr = &usb->intr; spin_lock_init(&intr->lock); intr->interval = int_urb_interval(zd_usb_to_usbdev(usb)); init_completion(&intr->read_regs.completion); atomic_set(&intr->read_regs_enabled, 0); intr->read_regs.cr_int_addr = cpu_to_le16((u16)CR_INTERRUPT); } static inline void init_usb_rx(struct zd_usb *usb) { struct zd_usb_rx *rx = &usb->rx; spin_lock_init(&rx->lock); mutex_init(&rx->setup_mutex); if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) { rx->usb_packet_size = 512; } else { rx->usb_packet_size = 64; } ZD_ASSERT(rx->fragment_length == 0); INIT_DELAYED_WORK(&rx->idle_work, zd_rx_idle_timer_handler); rx->reset_timer_tasklet.func = zd_usb_reset_rx_idle_timer_tasklet; rx->reset_timer_tasklet.data = (unsigned long)usb; } static inline void init_usb_tx(struct zd_usb *usb) { struct zd_usb_tx *tx = &usb->tx; spin_lock_init(&tx->lock); atomic_set(&tx->enabled, 0); tx->stopped = 0; skb_queue_head_init(&tx->submitted_skbs); init_usb_anchor(&tx->submitted); tx->submitted_urbs = 0; tx->watchdog_enabled = 0; INIT_DELAYED_WORK(&tx->watchdog_work, zd_tx_watchdog_handler); } void zd_usb_init(struct zd_usb *usb, struct ieee80211_hw *hw, struct usb_interface *intf) { memset(usb, 0, sizeof(*usb)); usb->intf = usb_get_intf(intf); usb_set_intfdata(usb->intf, hw); init_usb_anchor(&usb->submitted_cmds); init_usb_interrupt(usb); init_usb_tx(usb); init_usb_rx(usb); } void zd_usb_clear(struct zd_usb *usb) { usb_set_intfdata(usb->intf, NULL); usb_put_intf(usb->intf); ZD_MEMCLEAR(usb, sizeof(*usb)); /* FIXME: usb_interrupt, usb_tx, usb_rx? */ } static const char *speed(enum usb_device_speed speed) { switch (speed) { case USB_SPEED_LOW: return "low"; case USB_SPEED_FULL: return "full"; case USB_SPEED_HIGH: return "high"; default: return "unknown speed"; } } static int scnprint_id(struct usb_device *udev, char *buffer, size_t size) { return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s", le16_to_cpu(udev->descriptor.idVendor), le16_to_cpu(udev->descriptor.idProduct), get_bcdDevice(udev), speed(udev->speed)); } int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size) { struct usb_device *udev = interface_to_usbdev(usb->intf); return scnprint_id(udev, buffer, size); } #ifdef DEBUG static void print_id(struct usb_device *udev) { char buffer[40]; scnprint_id(udev, buffer, sizeof(buffer)); buffer[sizeof(buffer)-1] = 0; dev_dbg_f(&udev->dev, "%s\n", buffer); } #else #define print_id(udev) do { } while (0) #endif static int eject_installer(struct usb_interface *intf) { struct usb_device *udev = interface_to_usbdev(intf); struct usb_host_interface *iface_desc = &intf->altsetting[0]; struct usb_endpoint_descriptor *endpoint; unsigned char *cmd; u8 bulk_out_ep; int r; /* Find bulk out endpoint */ for (r = 1; r >= 0; r--) { endpoint = &iface_desc->endpoint[r].desc; if (usb_endpoint_dir_out(endpoint) && usb_endpoint_xfer_bulk(endpoint)) { bulk_out_ep = endpoint->bEndpointAddress; break; } } if (r == -1) { dev_err(&udev->dev, "zd1211rw: Could not find bulk out endpoint\n"); return -ENODEV; } cmd = kzalloc(31, GFP_KERNEL); if (cmd == NULL) return -ENODEV; /* USB bulk command block */ cmd[0] = 0x55; /* bulk command signature */ cmd[1] = 0x53; /* bulk command signature */ cmd[2] = 0x42; /* bulk command signature */ cmd[3] = 0x43; /* bulk command signature */ cmd[14] = 6; /* command length */ cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */ cmd[19] = 0x2; /* eject disc */ dev_info(&udev->dev, "Ejecting virtual installer media...\n"); r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep), cmd, 31, NULL, 2000); kfree(cmd); if (r) return r; /* At this point, the device disconnects and reconnects with the real * ID numbers. */ usb_set_intfdata(intf, NULL); return 0; } int zd_usb_init_hw(struct zd_usb *usb) { int r; struct zd_mac *mac = zd_usb_to_mac(usb); dev_dbg_f(zd_usb_dev(usb), "\n"); r = upload_firmware(usb); if (r) { dev_err(zd_usb_dev(usb), "couldn't load firmware. Error number %d\n", r); return r; } r = usb_reset_configuration(zd_usb_to_usbdev(usb)); if (r) { dev_dbg_f(zd_usb_dev(usb), "couldn't reset configuration. Error number %d\n", r); return r; } r = zd_mac_init_hw(mac->hw); if (r) { dev_dbg_f(zd_usb_dev(usb), "couldn't initialize mac. Error number %d\n", r); return r; } usb->initialized = 1; return 0; } static int probe(struct usb_interface *intf, const struct usb_device_id *id) { int r; struct usb_device *udev = interface_to_usbdev(intf); struct zd_usb *usb; struct ieee80211_hw *hw = NULL; print_id(udev); if (id->driver_info & DEVICE_INSTALLER) return eject_installer(intf); switch (udev->speed) { case USB_SPEED_LOW: case USB_SPEED_FULL: case USB_SPEED_HIGH: break; default: dev_dbg_f(&intf->dev, "Unknown USB speed\n"); r = -ENODEV; goto error; } r = usb_reset_device(udev); if (r) { dev_err(&intf->dev, "couldn't reset usb device. Error number %d\n", r); goto error; } hw = zd_mac_alloc_hw(intf); if (hw == NULL) { r = -ENOMEM; goto error; } usb = &zd_hw_mac(hw)->chip.usb; usb->is_zd1211b = (id->driver_info == DEVICE_ZD1211B) != 0; r = zd_mac_preinit_hw(hw); if (r) { dev_dbg_f(&intf->dev, "couldn't initialize mac. Error number %d\n", r); goto error; } r = ieee80211_register_hw(hw); if (r) { dev_dbg_f(&intf->dev, "couldn't register device. Error number %d\n", r); goto error; } dev_dbg_f(&intf->dev, "successful\n"); dev_info(&intf->dev, "%s\n", wiphy_name(hw->wiphy)); return 0; error: usb_reset_device(interface_to_usbdev(intf)); if (hw) { zd_mac_clear(zd_hw_mac(hw)); ieee80211_free_hw(hw); } return r; } static void disconnect(struct usb_interface *intf) { struct ieee80211_hw *hw = zd_intf_to_hw(intf); struct zd_mac *mac; struct zd_usb *usb; /* Either something really bad happened, or we're just dealing with * a DEVICE_INSTALLER. */ if (hw == NULL) return; mac = zd_hw_mac(hw); usb = &mac->chip.usb; dev_dbg_f(zd_usb_dev(usb), "\n"); ieee80211_unregister_hw(hw); /* Just in case something has gone wrong! */ zd_usb_disable_tx(usb); zd_usb_disable_rx(usb); zd_usb_disable_int(usb); /* If the disconnect has been caused by a removal of the * driver module, the reset allows reloading of the driver. If the * reset will not be executed here, the upload of the firmware in the * probe function caused by the reloading of the driver will fail. */ usb_reset_device(interface_to_usbdev(intf)); zd_mac_clear(mac); ieee80211_free_hw(hw); dev_dbg(&intf->dev, "disconnected\n"); } static void zd_usb_resume(struct zd_usb *usb) { struct zd_mac *mac = zd_usb_to_mac(usb); int r; dev_dbg_f(zd_usb_dev(usb), "\n"); r = zd_op_start(zd_usb_to_hw(usb)); if (r < 0) { dev_warn(zd_usb_dev(usb), "Device resume failed " "with error code %d. Retrying...\n", r); if (usb->was_running) set_bit(ZD_DEVICE_RUNNING, &mac->flags); usb_queue_reset_device(usb->intf); return; } if (mac->type != NL80211_IFTYPE_UNSPECIFIED) { r = zd_restore_settings(mac); if (r < 0) { dev_dbg(zd_usb_dev(usb), "failed to restore settings, %d\n", r); return; } } } static void zd_usb_stop(struct zd_usb *usb) { dev_dbg_f(zd_usb_dev(usb), "\n"); zd_op_stop(zd_usb_to_hw(usb)); zd_usb_disable_tx(usb); zd_usb_disable_rx(usb); zd_usb_disable_int(usb); usb->initialized = 0; } static int pre_reset(struct usb_interface *intf) { struct ieee80211_hw *hw = usb_get_intfdata(intf); struct zd_mac *mac; struct zd_usb *usb; if (!hw || intf->condition != USB_INTERFACE_BOUND) return 0; mac = zd_hw_mac(hw); usb = &mac->chip.usb; usb->was_running = test_bit(ZD_DEVICE_RUNNING, &mac->flags); zd_usb_stop(usb); mutex_lock(&mac->chip.mutex); return 0; } static int post_reset(struct usb_interface *intf) { struct ieee80211_hw *hw = usb_get_intfdata(intf); struct zd_mac *mac; struct zd_usb *usb; if (!hw || intf->condition != USB_INTERFACE_BOUND) return 0; mac = zd_hw_mac(hw); usb = &mac->chip.usb; mutex_unlock(&mac->chip.mutex); if (usb->was_running) zd_usb_resume(usb); return 0; } static struct usb_driver driver = { .name = KBUILD_MODNAME, .id_table = usb_ids, .probe = probe, .disconnect = disconnect, .pre_reset = pre_reset, .post_reset = post_reset, #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,5,0)) .disable_hub_initiated_lpm = 1, #endif }; struct workqueue_struct *zd_workqueue; static int __init usb_init(void) { int r; pr_debug("%s usb_init()\n", driver.name); zd_workqueue = create_singlethread_workqueue(driver.name); if (zd_workqueue == NULL) { printk(KERN_ERR "%s couldn't create workqueue\n", driver.name); return -ENOMEM; } r = usb_register(&driver); if (r) { destroy_workqueue(zd_workqueue); printk(KERN_ERR "%s usb_register() failed. Error number %d\n", driver.name, r); return r; } pr_debug("%s initialized\n", driver.name); return 0; } static void __exit usb_exit(void) { pr_debug("%s usb_exit()\n", driver.name); usb_deregister(&driver); destroy_workqueue(zd_workqueue); } module_init(usb_init); module_exit(usb_exit); static int zd_ep_regs_out_msg(struct usb_device *udev, void *data, int len, int *actual_length, int timeout) { /* In USB 2.0 mode EP_REGS_OUT endpoint is interrupt type. However in * USB 1.1 mode endpoint is bulk. Select correct type URB by endpoint * descriptor. */ struct usb_host_endpoint *ep; unsigned int pipe; pipe = usb_sndintpipe(udev, EP_REGS_OUT); ep = usb_pipe_endpoint(udev, pipe); if (!ep) return -EINVAL; if (usb_endpoint_xfer_int(&ep->desc)) { return usb_interrupt_msg(udev, pipe, data, len, actual_length, timeout); } else { pipe = usb_sndbulkpipe(udev, EP_REGS_OUT); return usb_bulk_msg(udev, pipe, data, len, actual_length, timeout); } } static int usb_int_regs_length(unsigned int count) { return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data); } static void prepare_read_regs_int(struct zd_usb *usb, struct usb_req_read_regs *req, unsigned int count) { struct zd_usb_interrupt *intr = &usb->intr; spin_lock_irq(&intr->lock); atomic_set(&intr->read_regs_enabled, 1); intr->read_regs.req = req; intr->read_regs.req_count = count; INIT_COMPLETION(intr->read_regs.completion); spin_unlock_irq(&intr->lock); } static void disable_read_regs_int(struct zd_usb *usb) { struct zd_usb_interrupt *intr = &usb->intr; spin_lock_irq(&intr->lock); atomic_set(&intr->read_regs_enabled, 0); spin_unlock_irq(&intr->lock); } static bool check_read_regs(struct zd_usb *usb, struct usb_req_read_regs *req, unsigned int count) { int i; struct zd_usb_interrupt *intr = &usb->intr; struct read_regs_int *rr = &intr->read_regs; struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer; /* The created block size seems to be larger than expected. * However results appear to be correct. */ if (rr->length < usb_int_regs_length(count)) { dev_dbg_f(zd_usb_dev(usb), "error: actual length %d less than expected %d\n", rr->length, usb_int_regs_length(count)); return false; } if (rr->length > sizeof(rr->buffer)) { dev_dbg_f(zd_usb_dev(usb), "error: actual length %d exceeds buffer size %zu\n", rr->length, sizeof(rr->buffer)); return false; } for (i = 0; i < count; i++) { struct reg_data *rd = ®s->regs[i]; if (rd->addr != req->addr[i]) { dev_dbg_f(zd_usb_dev(usb), "rd[%d] addr %#06hx expected %#06hx\n", i, le16_to_cpu(rd->addr), le16_to_cpu(req->addr[i])); return false; } } return true; } static int get_results(struct zd_usb *usb, u16 *values, struct usb_req_read_regs *req, unsigned int count, bool *retry) { int r; int i; struct zd_usb_interrupt *intr = &usb->intr; struct read_regs_int *rr = &intr->read_regs; struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer; spin_lock_irq(&intr->lock); r = -EIO; /* Read failed because firmware bug? */ *retry = !!intr->read_regs_int_overridden; if (*retry) goto error_unlock; if (!check_read_regs(usb, req, count)) { dev_dbg_f(zd_usb_dev(usb), "error: invalid read regs\n"); goto error_unlock; } for (i = 0; i < count; i++) { struct reg_data *rd = ®s->regs[i]; values[i] = le16_to_cpu(rd->value); } r = 0; error_unlock: spin_unlock_irq(&intr->lock); return r; } int zd_usb_ioread16v(struct zd_usb *usb, u16 *values, const zd_addr_t *addresses, unsigned int count) { int r, i, req_len, actual_req_len, try_count = 0; struct usb_device *udev; struct usb_req_read_regs *req = NULL; unsigned long timeout; bool retry = false; if (count < 1) { dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n"); return -EINVAL; } if (count > USB_MAX_IOREAD16_COUNT) { dev_dbg_f(zd_usb_dev(usb), "error: count %u exceeds possible max %u\n", count, USB_MAX_IOREAD16_COUNT); return -EINVAL; } if (in_atomic()) { dev_dbg_f(zd_usb_dev(usb), "error: io in atomic context not supported\n"); return -EWOULDBLOCK; } if (!usb_int_enabled(usb)) { dev_dbg_f(zd_usb_dev(usb), "error: usb interrupt not enabled\n"); return -EWOULDBLOCK; } ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex)); BUILD_BUG_ON(sizeof(struct usb_req_read_regs) + USB_MAX_IOREAD16_COUNT * sizeof(__le16) > sizeof(usb->req_buf)); BUG_ON(sizeof(struct usb_req_read_regs) + count * sizeof(__le16) > sizeof(usb->req_buf)); req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16); req = (void *)usb->req_buf; req->id = cpu_to_le16(USB_REQ_READ_REGS); for (i = 0; i < count; i++) req->addr[i] = cpu_to_le16((u16)addresses[i]); retry_read: try_count++; udev = zd_usb_to_usbdev(usb); prepare_read_regs_int(usb, req, count); r = zd_ep_regs_out_msg(udev, req, req_len, &actual_req_len, 50 /*ms*/); if (r) { dev_dbg_f(zd_usb_dev(usb), "error in zd_ep_regs_out_msg(). Error number %d\n", r); goto error; } if (req_len != actual_req_len) { dev_dbg_f(zd_usb_dev(usb), "error in zd_ep_regs_out_msg()\n" " req_len %d != actual_req_len %d\n", req_len, actual_req_len); r = -EIO; goto error; } timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion, msecs_to_jiffies(50)); if (!timeout) { disable_read_regs_int(usb); dev_dbg_f(zd_usb_dev(usb), "read timed out\n"); r = -ETIMEDOUT; goto error; } r = get_results(usb, values, req, count, &retry); if (retry && try_count < 20) { dev_dbg_f(zd_usb_dev(usb), "read retry, tries so far: %d\n", try_count); goto retry_read; } error: return r; } static void iowrite16v_urb_complete(struct urb *urb) { struct zd_usb *usb = urb->context; if (urb->status && !usb->cmd_error) usb->cmd_error = urb->status; if (!usb->cmd_error && urb->actual_length != urb->transfer_buffer_length) usb->cmd_error = -EIO; } static int zd_submit_waiting_urb(struct zd_usb *usb, bool last) { int r = 0; struct urb *urb = usb->urb_async_waiting; if (!urb) return 0; usb->urb_async_waiting = NULL; if (!last) urb->transfer_flags |= URB_NO_INTERRUPT; usb_anchor_urb(urb, &usb->submitted_cmds); r = usb_submit_urb(urb, GFP_KERNEL); if (r) { usb_unanchor_urb(urb); dev_dbg_f(zd_usb_dev(usb), "error in usb_submit_urb(). Error number %d\n", r); goto error; } /* fall-through with r == 0 */ error: usb_free_urb(urb); return r; } void zd_usb_iowrite16v_async_start(struct zd_usb *usb) { ZD_ASSERT(usb_anchor_empty(&usb->submitted_cmds)); ZD_ASSERT(usb->urb_async_waiting == NULL); ZD_ASSERT(!usb->in_async); ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex)); usb->in_async = 1; usb->cmd_error = 0; usb->urb_async_waiting = NULL; } int zd_usb_iowrite16v_async_end(struct zd_usb *usb, unsigned int timeout) { int r; ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex)); ZD_ASSERT(usb->in_async); /* Submit last iowrite16v URB */ r = zd_submit_waiting_urb(usb, true); if (r) { dev_dbg_f(zd_usb_dev(usb), "error in zd_submit_waiting_usb(). " "Error number %d\n", r); usb_kill_anchored_urbs(&usb->submitted_cmds); goto error; } if (timeout) timeout = usb_wait_anchor_empty_timeout(&usb->submitted_cmds, timeout); if (!timeout) { usb_kill_anchored_urbs(&usb->submitted_cmds); if (usb->cmd_error == -ENOENT) { dev_dbg_f(zd_usb_dev(usb), "timed out"); r = -ETIMEDOUT; goto error; } } r = usb->cmd_error; error: usb->in_async = 0; return r; } int zd_usb_iowrite16v_async(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs, unsigned int count) { int r; struct usb_device *udev; struct usb_req_write_regs *req = NULL; int i, req_len; struct urb *urb; struct usb_host_endpoint *ep; ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex)); ZD_ASSERT(usb->in_async); if (count == 0) return 0; if (count > USB_MAX_IOWRITE16_COUNT) { dev_dbg_f(zd_usb_dev(usb), "error: count %u exceeds possible max %u\n", count, USB_MAX_IOWRITE16_COUNT); return -EINVAL; } if (in_atomic()) { dev_dbg_f(zd_usb_dev(usb), "error: io in atomic context not supported\n"); return -EWOULDBLOCK; } udev = zd_usb_to_usbdev(usb); ep = usb_pipe_endpoint(udev, usb_sndintpipe(udev, EP_REGS_OUT)); if (!ep) return -ENOENT; urb = usb_alloc_urb(0, GFP_KERNEL); if (!urb) return -ENOMEM; req_len = sizeof(struct usb_req_write_regs) + count * sizeof(struct reg_data); req = kmalloc(req_len, GFP_KERNEL); if (!req) { r = -ENOMEM; goto error; } req->id = cpu_to_le16(USB_REQ_WRITE_REGS); for (i = 0; i < count; i++) { struct reg_data *rw = &req->reg_writes[i]; rw->addr = cpu_to_le16((u16)ioreqs[i].addr); rw->value = cpu_to_le16(ioreqs[i].value); } /* In USB 2.0 mode endpoint is interrupt type. However in USB 1.1 mode * endpoint is bulk. Select correct type URB by endpoint descriptor. */ if (usb_endpoint_xfer_int(&ep->desc)) usb_fill_int_urb(urb, udev, usb_sndintpipe(udev, EP_REGS_OUT), req, req_len, iowrite16v_urb_complete, usb, ep->desc.bInterval); else usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_REGS_OUT), req, req_len, iowrite16v_urb_complete, usb); urb->transfer_flags |= URB_FREE_BUFFER; /* Submit previous URB */ r = zd_submit_waiting_urb(usb, false); if (r) { dev_dbg_f(zd_usb_dev(usb), "error in zd_submit_waiting_usb(). " "Error number %d\n", r); goto error; } /* Delay submit so that URB_NO_INTERRUPT flag can be set for all URBs * of currect batch except for very last. */ usb->urb_async_waiting = urb; return 0; error: usb_free_urb(urb); return r; } int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs, unsigned int count) { int r; zd_usb_iowrite16v_async_start(usb); r = zd_usb_iowrite16v_async(usb, ioreqs, count); if (r) { zd_usb_iowrite16v_async_end(usb, 0); return r; } return zd_usb_iowrite16v_async_end(usb, 50 /* ms */); } int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits) { int r; struct usb_device *udev; struct usb_req_rfwrite *req = NULL; int i, req_len, actual_req_len; u16 bit_value_template; if (in_atomic()) { dev_dbg_f(zd_usb_dev(usb), "error: io in atomic context not supported\n"); return -EWOULDBLOCK; } if (bits < USB_MIN_RFWRITE_BIT_COUNT) { dev_dbg_f(zd_usb_dev(usb), "error: bits %d are smaller than" " USB_MIN_RFWRITE_BIT_COUNT %d\n", bits, USB_MIN_RFWRITE_BIT_COUNT); return -EINVAL; } if (bits > USB_MAX_RFWRITE_BIT_COUNT) { dev_dbg_f(zd_usb_dev(usb), "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n", bits, USB_MAX_RFWRITE_BIT_COUNT); return -EINVAL; } #ifdef DEBUG if (value & (~0UL << bits)) { dev_dbg_f(zd_usb_dev(usb), "error: value %#09x has bits >= %d set\n", value, bits); return -EINVAL; } #endif /* DEBUG */ dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits); r = zd_usb_ioread16(usb, &bit_value_template, ZD_CR203); if (r) { dev_dbg_f(zd_usb_dev(usb), "error %d: Couldn't read ZD_CR203\n", r); return r; } bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA); ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex)); BUILD_BUG_ON(sizeof(struct usb_req_rfwrite) + USB_MAX_RFWRITE_BIT_COUNT * sizeof(__le16) > sizeof(usb->req_buf)); BUG_ON(sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16) > sizeof(usb->req_buf)); req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16); req = (void *)usb->req_buf; req->id = cpu_to_le16(USB_REQ_WRITE_RF); /* 1: 3683a, but not used in ZYDAS driver */ req->value = cpu_to_le16(2); req->bits = cpu_to_le16(bits); for (i = 0; i < bits; i++) { u16 bv = bit_value_template; if (value & (1 << (bits-1-i))) bv |= RF_DATA; req->bit_values[i] = cpu_to_le16(bv); } udev = zd_usb_to_usbdev(usb); r = zd_ep_regs_out_msg(udev, req, req_len, &actual_req_len, 50 /*ms*/); if (r) { dev_dbg_f(zd_usb_dev(usb), "error in zd_ep_regs_out_msg(). Error number %d\n", r); goto out; } if (req_len != actual_req_len) { dev_dbg_f(zd_usb_dev(usb), "error in zd_ep_regs_out_msg()" " req_len %d != actual_req_len %d\n", req_len, actual_req_len); r = -EIO; goto out; } /* FALL-THROUGH with r == 0 */ out: return r; }