diff options
Diffstat (limited to 'drivers/staging/ced1401/ced_ioc.c')
| -rw-r--r-- | drivers/staging/ced1401/ced_ioc.c | 1613 |
1 files changed, 0 insertions, 1613 deletions
diff --git a/drivers/staging/ced1401/ced_ioc.c b/drivers/staging/ced1401/ced_ioc.c deleted file mode 100644 index 8cb6ea9..0000000 --- a/drivers/staging/ced1401/ced_ioc.c +++ /dev/null @@ -1,1613 +0,0 @@ -/* ced_ioc.c - ioctl part of the 1401 usb device driver for linux. - Copyright (C) 2010 Cambridge Electronic Design Ltd - Author Greg P Smith (greg@ced.co.uk) - - 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. -*/ -#include <linux/kernel.h> -#include <linux/errno.h> -#include <linux/slab.h> -#include <linux/module.h> -#include <linux/kref.h> -#include <linux/uaccess.h> -#include <linux/usb.h> -#include <linux/mutex.h> -#include <linux/page-flags.h> -#include <linux/pagemap.h> -#include <linux/jiffies.h> - -#include "usb1401.h" - -/**************************************************************************** -** ced_flush_out_buff -** -** Empties the Output buffer and sets int lines. Used from user level only -****************************************************************************/ -static void ced_flush_out_buff(struct ced_data *ced) -{ - dev_dbg(&ced->interface->dev, "%s: current_state=%d\n", - __func__, ced->current_state); - - /* Do nothing if hardware in trouble */ - if (ced->current_state == U14ERR_TIME) - return; - /* Kill off any pending I/O */ - /* CharSend_Cancel(ced); */ - spin_lock_irq(&ced->char_out_lock); - ced->num_output = 0; - ced->out_buff_get = 0; - ced->out_buff_put = 0; - spin_unlock_irq(&ced->char_out_lock); -} - -/**************************************************************************** -** -** ced_flush_in_buff -** -** Empties the input buffer and sets int lines -****************************************************************************/ -static void ced_flush_in_buff(struct ced_data *ced) -{ - dev_dbg(&ced->interface->dev, "%s: current_state=%d\n", - __func__, ced->current_state); - - if (ced->current_state == U14ERR_TIME) - return; /* Do nothing if hardware in trouble */ - - /* Kill off any pending I/O */ - /* CharRead_Cancel(pDevObject); */ - spin_lock_irq(&ced->char_in_lock); - ced->num_input = 0; - ced->in_buff_get = 0; - ced->in_buff_put = 0; - spin_unlock_irq(&ced->char_in_lock); -} - -/**************************************************************************** -** ced_put_chars -** -** Utility routine to copy chars into the output buffer and fire them off. -** called from user mode, holds char_out_lock. -****************************************************************************/ -static int ced_put_chars(struct ced_data *ced, const char *ch, - unsigned int count) -{ - int ret; - - spin_lock_irq(&ced->char_out_lock); /* get the output spin lock */ - if ((OUTBUF_SZ - ced->num_output) >= count) { - unsigned int u; - - for (u = 0; u < count; u++) { - ced->output_buffer[ced->out_buff_put++] = ch[u]; - if (ced->out_buff_put >= OUTBUF_SZ) - ced->out_buff_put = 0; - } - ced->num_output += count; - spin_unlock_irq(&ced->char_out_lock); - - /* ...give a chance to transmit data */ - ret = ced_send_chars(ced); - } else { - ret = U14ERR_NOOUT; /* no room at the out (ha-ha) */ - spin_unlock_irq(&ced->char_out_lock); - } - return ret; -} - -/***************************************************************************** -** Add the data in "data" local pointer of length n to the output buffer, and -** trigger an output transfer if this is appropriate. User mode. -** Holds the io_mutex -*****************************************************************************/ -int ced_send_string(struct ced_data *ced, const char __user *data, - unsigned int n) -{ - int ret = U14ERR_NOERROR; /* assume all will be well */ - char buffer[OUTBUF_SZ + 1]; /* space in our address space */ - /* for characters */ - if (n > OUTBUF_SZ) /* check space in local buffer... */ - return U14ERR_NOOUT; /* ...too many characters */ - if (copy_from_user(buffer, data, n)) - return -EFAULT; - buffer[n] = 0; /* terminate for debug purposes */ - - mutex_lock(&ced->io_mutex); /* Protect disconnect from new i/o */ - if (n > 0) { /* do nothing if nowt to do! */ - dev_dbg(&ced->interface->dev, "%s: n=%d>%s<\n", - __func__, n, buffer); - ret = ced_put_chars(ced, buffer, n); - } - - ced_allowi(ced); /* make sure we have input int */ - mutex_unlock(&ced->io_mutex); - - return ret; -} - -/**************************************************************************** -** ced_send_char -** -** Sends a single character to the 1401. User mode, holds io_mutex. -****************************************************************************/ -int ced_send_char(struct ced_data *ced, char c) -{ - int ret; - - mutex_lock(&ced->io_mutex); /* Protect disconnect from new i/o */ - ret = ced_put_chars(ced, &c, 1); - dev_dbg(&ced->interface->dev, "ced_send_char >%c< (0x%02x)\n", c, c); - ced_allowi(ced); /* Make sure char reads are running */ - mutex_unlock(&ced->io_mutex); - return ret; -} - -/*************************************************************************** -** -** ced_get_state -** -** Retrieves state information from the 1401, adjusts the 1401 state held -** in the device extension to indicate the current 1401 type. -** -** *state is updated with information about the 1401 state as returned by the -** 1401. The low byte is a code for what 1401 is doing: -** -** 0 normal 1401 operation -** 1 sending chars to host -** 2 sending block data to host -** 3 reading block data from host -** 4 sending an escape sequence to the host -** 0x80 1401 is executing self-test, in which case the upper word -** is the last error code seen (or zero for no new error). -** -** *error is updated with error information if a self-test error code -** is returned in the upper word of state. -** -** both state and error are set to -1 if there are comms problems, and -** to zero if there is a simple failure. -** -** return error code (U14ERR_NOERROR for OK) -*/ -int ced_get_state(struct ced_data *ced, __u32 *state, __u32 *error) -{ - int got; - - dev_dbg(&ced->interface->dev, "%s: entry\n", __func__); - - *state = 0xFFFFFFFF; /* Start off with invalid state */ - got = usb_control_msg(ced->udev, usb_rcvctrlpipe(ced->udev, 0), - GET_STATUS, (D_TO_H | VENDOR | DEVREQ), 0, 0, - ced->stat_buf, sizeof(ced->stat_buf), HZ); - if (got != sizeof(ced->stat_buf)) { - dev_err(&ced->interface->dev, - "%s: FAILED, return code %d\n", __func__, got); - /* Indicate that things are very wrong indeed */ - ced->current_state = U14ERR_TIME; - *state = 0; /* Force status values to a known state */ - *error = 0; - } else { - int device; - - dev_dbg(&ced->interface->dev, - "%s: Success, state: 0x%x, 0x%x\n", - __func__, ced->stat_buf[0], ced->stat_buf[1]); - - /* Return the state values to the calling code */ - *state = ced->stat_buf[0]; - - *error = ced->stat_buf[1]; - - /* 1401 type code value */ - device = ced->udev->descriptor.bcdDevice >> 8; - switch (device) { /* so we can clean up current state */ - case 0: - ced->current_state = U14ERR_U1401; - break; - - default: /* allow lots of device codes for future 1401s */ - if ((device >= 1) && (device <= 23)) - ced->current_state = (short)(device + 6); - else - ced->current_state = U14ERR_ILL; - break; - } - } - - return ced->current_state >= 0 ? U14ERR_NOERROR : ced->current_state; -} - -/**************************************************************************** -** ced_read_write_cancel -** -** Kills off staged read\write request from the USB if one is pending. -****************************************************************************/ -int ced_read_write_cancel(struct ced_data *ced) -{ - dev_dbg(&ced->interface->dev, "%s: entry %d\n", - __func__, ced->staged_urb_pending); -#ifdef NOT_WRITTEN_YET - int ntStatus = STATUS_SUCCESS; - bool bResult = false; - unsigned int i; - - /* We can fill this in when we know how we will implement the staged */ - /* transfer stuff */ - spin_lock_irq(&ced->staged_lock); - - if (ced->staged_urb_pending) {/* anything to be cancelled? */ - /* May need more... */ - dev_info(&ced->interface - dev, - "ced_read_write_cancel about to cancel Urb\n"); - /* Clear the staging done flag */ - /* KeClearEvent(&ced->StagingDoneEvent); */ - USB_ASSERT(ced->pStagedIrp != NULL); - - /* Release the spinlock first otherwise the completion */ - /* routine may hang on the spinlock while this function */ - /* hands waiting for the event. */ - spin_unlock_irq(&ced->staged_lock); - - /* Actually do the cancel */ - bResult = IoCancelIrp(ced->pStagedIrp); - if (bResult) { - LARGE_INTEGER timeout; - - /* Use a timeout of 1 second */ - timeout.QuadPart = -10000000; - dev_info(&ced->interface - dev, - "%s: about to wait till done\n", __func__); - ntStatus = - KeWaitForSingleObject(&ced->StagingDoneEvent, - Executive, KernelMode, FALSE, - &timeout); - } else { - dev_info(&ced->interface - dev, - "%s: cancellation failed\n", __func__); - ntStatus = U14ERR_FAIL; - } - USB_KdPrint(DBGLVL_DEFAULT, - ("ced_read_write_cancel ntStatus = 0x%x decimal %d\n", - ntStatus, ntStatus)); - } else - spin_unlock_irq(&ced->staged_lock); - - dev_info(&ced->interface - dev, "%s: done\n", __func__); - return ntStatus; -#else - return U14ERR_NOERROR; -#endif - -} - -/*************************************************************************** -** ced_in_self_test - utility to check in self test. Return 1 for ST, 0 for not -** or a -ve error code if we failed for some reason. -***************************************************************************/ -static int ced_in_self_test(struct ced_data *ced, unsigned int *stat) -{ - unsigned int state, error; - int ret = ced_get_state(ced, &state, &error); /* see if in self-test */ - - if (ret == U14ERR_NOERROR) /* if all still OK */ - ret = (state == (unsigned int)-1) || /* TX problem or... */ - ((state & 0xff) == 0x80); /* ...self test */ - *stat = state; /* return actual state */ - return ret; -} - -/*************************************************************************** -** ced_is_1401 - ALWAYS CALLED HOLDING THE io_mutex -** -** Tests for the current state of the 1401. Sets current_state: -** -** U14ERR_NOIF 1401 i/f card not installed (not done here) -** U14ERR_OFF 1401 apparently not switched on -** U14ERR_NC 1401 appears to be not connected -** U14ERR_ILL 1401 if it is there its not very well at all -** U14ERR_TIME 1401 appears OK, but doesn't communicate - very bad -** U14ERR_STD 1401 OK and ready for use -** U14ERR_PLUS 1401+ OK and ready for use -** U14ERR_U1401 Micro1401 OK and ready for use -** U14ERR_POWER Power1401 OK and ready for use -** U14ERR_U14012 Micro1401 mkII OK and ready for use -** -** Returns TRUE if a 1401 detected and OK, else FALSE -****************************************************************************/ -static bool ced_is_1401(struct ced_data *ced) -{ - int ret; - - dev_dbg(&ced->interface->dev, "%s\n", __func__); - - ced_draw_down(ced); /* wait for, then kill outstanding Urbs */ - ced_flush_in_buff(ced); /* Clear out input buffer & pipe */ - ced_flush_out_buff(ced); /* Clear output buffer & pipe */ - - /* The next call returns 0 if OK, but has returned 1 in the past, */ - /* meaning that usb_unlock_device() is needed... now it always is */ - ret = usb_lock_device_for_reset(ced->udev, ced->interface); - - /* release the io_mutex because if we don't, we will deadlock due to */ - /* system calls back into the driver. */ - mutex_unlock(&ced->io_mutex); /* locked, so we will not get */ - /* system calls */ - if (ret >= 0) { /* if we failed */ - ret = usb_reset_device(ced->udev); /* try to do the reset */ - usb_unlock_device(ced->udev); /* undo the lock */ - } - - mutex_lock(&ced->io_mutex); /* hold stuff off while we wait */ - ced->dma_flag = MODE_CHAR; /* Clear DMA mode flag regardless! */ - if (ret == 0) { /* if all is OK still */ - unsigned int state; - - ret = ced_in_self_test(ced, &state); /* see if likely in */ - /* self test */ - if (ret > 0) { /* do we need to wait for self-test? */ - /* when to give up */ - unsigned long timeout = jiffies + 30 * HZ; - - while ((ret > 0) && time_before(jiffies, timeout)) { - schedule(); /* let other stuff run */ - - /* see if done yet */ - ret = ced_in_self_test(ced, &state); - } - } - - if (ret == 0) /* if all is OK... */ - /* then success is that the state is 0 */ - ret = state == 0; - } else - ret = 0; /* we failed */ - ced->force_reset = false; /* Clear forced reset flag now */ - - return ret > 0; -} - -/**************************************************************************** -** ced_quick_check - ALWAYS CALLED HOLDING THE io_mutex -** This is used to test for a 1401. It will try to do a quick check if all is -** OK, that is the 1401 was OK the last time it was asked, and there is no DMA -** in progress, and if the bTestBuff flag is set, the character buffers must be -** empty too. If the quick check shows that the state is still the same, then -** all is OK. -** -** If any of the above conditions are not met, or if the state or type of the -** 1401 has changed since the previous test, the full ced_is_1401 test is done, -** but only if can_reset is also TRUE. -** -** The return value is TRUE if a useable 1401 is found, FALSE if not -*/ -static bool ced_quick_check(struct ced_data *ced, bool test_buff, - bool can_reset) -{ - bool ret = false; /* assume it will fail and we will reset */ - bool short_test; - - short_test = ((ced->dma_flag == MODE_CHAR) && /* no DMA running */ - (!ced->force_reset) && /* Not had a real reset forced */ - /* No 1401 errors stored */ - (ced->current_state >= U14ERR_STD)); - - dev_dbg(&ced->interface->dev, - "%s: DMAFlag:%d, state:%d, force:%d, testBuff:%d, short:%d\n", - __func__, ced->dma_flag, ced->current_state, ced->force_reset, - test_buff, short_test); - - if ((test_buff) && /* Buffer check requested, and... */ - (ced->num_input || ced->num_output)) {/* ...characters were in */ - /* the buffer? */ - short_test = false; /* Then do the full test */ - dev_dbg(&ced->interface->dev, - "%s: will reset as buffers not empty\n", __func__); - } - - if (short_test || !can_reset) { /* Still OK to try the short test? */ - /* Always test if no reset - we */ - /* want state update */ - unsigned int state, error; - - dev_dbg(&ced->interface->dev, "%s: ced_get_state\n", __func__); - - /* Check on the 1401 state */ - if (ced_get_state(ced, &state, &error) == U14ERR_NOERROR) { - /* If call worked, check the status value */ - if ((state & 0xFF) == 0) - ret = true; /* If that was zero, all is OK, */ - /* no reset needed */ - } - } - - if (!ret && can_reset) { /* If all not OK, then */ - dev_info(&ced->interface->dev, "%s: ced_is_1401 %d %d %d %d\n", - __func__, short_test, ced->current_state, test_buff, - ced->force_reset); - ret = ced_is_1401(ced); /* do full test */ - } - - return ret; -} - -/**************************************************************************** -** ced_reset -** -** Resets the 1401 and empties the i/o buffers -*****************************************************************************/ -int ced_reset(struct ced_data *ced) -{ - mutex_lock(&ced->io_mutex); /* Protect disconnect from new i/o */ - dev_dbg(&ced->interface->dev, "%s: About to call ced_quick_check\n", - __func__); - ced_quick_check(ced, true, true); /* Check 1401, reset if not OK */ - mutex_unlock(&ced->io_mutex); - return U14ERR_NOERROR; -} - -/**************************************************************************** -** ced_get_char -** -** Gets a single character from the 1401 -****************************************************************************/ -int ced_get_char(struct ced_data *ced) -{ - int ret = U14ERR_NOIN; /* assume we will get nothing */ - - mutex_lock(&ced->io_mutex); /* Protect disconnect from new i/o */ - - dev_dbg(&ced->interface->dev, "%s\n", __func__); - - ced_allowi(ced); /* Make sure char reads are running */ - ced_send_chars(ced); /* and send any buffered chars */ - - spin_lock_irq(&ced->char_in_lock); - if (ced->num_input > 0) { /* worth looking */ - ret = ced->input_buffer[ced->in_buff_get++]; - if (ced->in_buff_get >= INBUF_SZ) - ced->in_buff_get = 0; - ced->num_input--; - } else - ret = U14ERR_NOIN; /* no input data to read */ - spin_unlock_irq(&ced->char_in_lock); - - ced_allowi(ced); /* Make sure char reads are running */ - - mutex_unlock(&ced->io_mutex); /* Protect disconnect from new i/o */ - return ret; -} - -/**************************************************************************** -** ced_get_string -** -** Gets a string from the 1401. Returns chars up to the next CR or when -** there are no more to read or nowhere to put them. CR is translated to -** 0 and counted as a character. If the string does not end in a 0, we will -** add one, if there is room, but it is not counted as a character. -** -** returns the count of characters (including the terminator, or 0 if none -** or a negative error code. -****************************************************************************/ -int ced_get_string(struct ced_data *ced, char __user *user, int n) -{ - int available; /* character in the buffer */ - int ret = U14ERR_NOIN; - - if (n <= 0) - return -ENOMEM; - - mutex_lock(&ced->io_mutex); /* Protect disconnect from new i/o */ - ced_allowi(ced); /* Make sure char reads are running */ - ced_send_chars(ced); /* and send any buffered chars */ - - spin_lock_irq(&ced->char_in_lock); - available = ced->num_input; /* characters available now */ - if (available > n) /* read max of space in user... */ - available = n; /* ...or input characters */ - - if (available > 0) { /* worth looking? */ - char buffer[INBUF_SZ + 1]; /* space for a linear copy of data */ - int got = 0; - int n_copy_to_user; /* number to copy to user */ - char data; - - do { - data = ced->input_buffer[ced->in_buff_get++]; - if (data == CR_CHAR) /* replace CR with zero */ - data = (char)0; - - if (ced->in_buff_get >= INBUF_SZ) - ced->in_buff_get = 0; /* wrap buffer pointer */ - - buffer[got++] = data; /* save the output */ - } while ((got < available) && data); - - n_copy_to_user = got; /* what to copy... */ - if (data) { /* do we need null */ - buffer[got] = (char)0; /* make it tidy */ - if (got < n) /* if space in user buffer... */ - ++n_copy_to_user; /* ...copy the 0 as well. */ - } - - ced->num_input -= got; - spin_unlock_irq(&ced->char_in_lock); - - dev_dbg(&ced->interface->dev, "%s: read %d characters >%s<\n", - __func__, got, buffer); - if (copy_to_user(user, buffer, n_copy_to_user)) - ret = -EFAULT; - else - ret = got; /* report characters read */ - } else - spin_unlock_irq(&ced->char_in_lock); - - ced_allowi(ced); /* Make sure char reads are running */ - mutex_unlock(&ced->io_mutex); /* Protect disconnect from new i/o */ - - return ret; -} - -/******************************************************************************* -** Get count of characters in the inout buffer. -*******************************************************************************/ -int ced_stat_1401(struct ced_data *ced) -{ - int ret; - - mutex_lock(&ced->io_mutex); /* Protect disconnect from new i/o */ - ced_allowi(ced); /* make sure we allow pending chars */ - ced_send_chars(ced); /* in both directions */ - ret = ced->num_input; /* no lock as single read */ - mutex_unlock(&ced->io_mutex); /* Protect disconnect from new i/o */ - return ret; -} - -/**************************************************************************** -** ced_line_count -** -** Returns the number of newline chars in the buffer. There is no need for -** any fancy interlocks as we only read the interrupt routine data, and the -** system is arranged so nothing can be destroyed. -****************************************************************************/ -int ced_line_count(struct ced_data *ced) -{ - int ret = 0; /* will be count of line ends */ - - mutex_lock(&ced->io_mutex); /* Protect disconnect from new i/o */ - ced_allowi(ced); /* Make sure char reads are running */ - ced_send_chars(ced); /* and send any buffered chars */ - spin_lock_irq(&ced->char_in_lock); /* Get protection */ - - if (ced->num_input > 0) { /* worth looking? */ - /* start at first available */ - unsigned int index = ced->in_buff_get; - /* Position for search end */ - unsigned int end = ced->in_buff_put; - - do { - if (ced->input_buffer[index++] == CR_CHAR) - ++ret; /* inc count if CR */ - - if (index >= INBUF_SZ) /* see if we fall off buff */ - index = 0; - } while (index != end); /* go to last available */ - } - - spin_unlock_irq(&ced->char_in_lock); - dev_dbg(&ced->interface->dev, "%s: returned %d\n", __func__, ret); - mutex_unlock(&ced->io_mutex); /* Protect disconnect from new i/o */ - return ret; -} - -/**************************************************************************** -** ced_get_out_buf_space -** -** Gets the space in the output buffer. Called from user code. -*****************************************************************************/ -int ced_get_out_buf_space(struct ced_data *ced) -{ - int ret; - - mutex_lock(&ced->io_mutex); /* Protect disconnect from new i/o */ - - ced_send_chars(ced); /* send any buffered chars */ - - /* no lock needed for single read */ - ret = (int)(OUTBUF_SZ - ced->num_output); - - dev_dbg(&ced->interface->dev, "%s: %d\n", __func__, ret); - - mutex_unlock(&ced->io_mutex); /* Protect disconnect from new i/o */ - return ret; -} - -/**************************************************************************** -** -** ced_clear_area -** -** Clears up a transfer area. This is always called in the context of a user -** request, never from a call-back. -****************************************************************************/ -int ced_clear_area(struct ced_data *ced, int area) -{ - int ret = U14ERR_NOERROR; - - if ((area < 0) || (area >= MAX_TRANSAREAS)) { - ret = U14ERR_BADAREA; - dev_err(&ced->interface->dev, "%s: Attempt to clear area %d\n", - __func__, area); - } else { - /* to save typing */ - struct transarea *ta = &ced->trans_def[area]; - - if (!ta->used) /* if not used... */ - ret = U14ERR_NOTSET; /* ...nothing to be done */ - else { - /* We must save the memory we return as we shouldn't */ - /* mess with memory while holding a spin lock. */ - struct page **pages = NULL; /*save page address list*/ - int n_pages = 0; /* and number of pages */ - int np; - - dev_dbg(&ced->interface->dev, "%s: area %d\n", - __func__, area); - spin_lock_irq(&ced->staged_lock); - if ((ced->staged_id == area) - && (ced->dma_flag > MODE_CHAR)) { - /* cannot delete as in use */ - ret = U14ERR_UNLOCKFAIL; - dev_err(&ced->interface->dev, - "%s: call on area %d while active\n", - __func__, area); - } else { - pages = ta->pages; /* save page address list */ - n_pages = ta->n_pages; /* and page count */ - if (ta->event_sz)/* if events flagging in use */ - /* release anything that was waiting */ - wake_up_interruptible(&ta->event); - - if (ced->xfer_waiting - && (ced->dma_info.ident == area)) - /* Cannot have pending xfer if */ - /* area cleared */ - ced->xfer_waiting = false; - - /* Clean out the struct transarea except for */ - /* the wait queue, which is at the end. This */ - /* sets used to false and event_sz to 0 to */ - /* say area not used and no events. */ - memset(ta, 0, - sizeof(struct transarea) - - sizeof(wait_queue_head_t)); - } - spin_unlock_irq(&ced->staged_lock); - - if (pages) { /* if we decided to release the memory */ - /* Now we must undo the pinning down of the */ - /* pages. We will assume the worst and mark */ - /* all the pages as dirty. Don't be tempted */ - /* to move this up above as you must not be */ - /* holding a spin lock to do this stuff as */ - /* it is not atomic. */ - dev_dbg(&ced->interface->dev, - "%s: n_pages=%d\n", - __func__, n_pages); - - for (np = 0; np < n_pages; ++np) { - if (pages[np]) { - SetPageDirty(pages[np]); - page_cache_release(pages[np]); - } - } - - kfree(pages); - dev_dbg(&ced->interface->dev, - "%s: kfree(pages) done\n", __func__); - } - } - } - - return ret; -} - -/**************************************************************************** -** ced_set_area -** -** Sets up a transfer area - the functional part. Called by both -** ced_set_transfer and ced_set_circular. -****************************************************************************/ -static int ced_set_area(struct ced_data *ced, int area, char __user *buf, - unsigned int length, bool circular, bool circ_to_host) -{ - /* Start by working out the page aligned start of the area and the */ - /* size of the area in pages, allowing for the start not being */ - /* aligned and the end needing to be rounded up to a page boundary. */ - unsigned long start = ((unsigned long)buf) & PAGE_MASK; - unsigned int offset = ((unsigned long)buf) & (PAGE_SIZE - 1); - int len = (length + offset + PAGE_SIZE - 1) >> PAGE_SHIFT; - - struct transarea *ta = &ced->trans_def[area]; /* to save typing */ - struct page **pages = NULL; /* space for page tables */ - int n_pages = 0; /* and number of pages */ - - int ret = ced_clear_area(ced, area); /* see if OK to use this area */ - - if ((ret != U14ERR_NOTSET) && /* if not area unused and... */ - (ret != U14ERR_NOERROR)) /* ...not all OK, then... */ - return ret; /* ...we cannot use this area */ - - /* if we cannot access the memory... */ - if (!access_ok(VERIFY_WRITE, buf, length)) - return -EFAULT; /* ...then we are done */ - - /* Now allocate space to hold the page pointer and */ - /* virtual address pointer tables */ - pages = kmalloc(len * sizeof(struct page *), GFP_KERNEL); - if (!pages) { - ret = U14ERR_NOMEMORY; - goto error; - } - dev_dbg(&ced->interface->dev, "%s: %p, length=%06x, circular %d\n", - __func__, buf, length, circular); - - /* To pin down user pages we must first */ - /* acquire the mapping semaphore. */ - n_pages = get_user_pages_fast(start, len, 1, pages); - dev_dbg(&ced->interface->dev, "%s: n_pages = %d\n", __func__, n_pages); - - if (n_pages > 0) { /* if we succeeded */ - /* If you are tempted to use page_address (form LDD3), forget */ - /* it. You MUST use kmap() or kmap_atomic() to get a virtual */ - /* address. page_address will give you (null) or at least it */ - /* does in this context with an x86 machine. */ - spin_lock_irq(&ced->staged_lock); - ta->buff = buf; /* keep start of region (user address) */ - ta->base_offset = offset; /* save offset in first page */ - /* to start of xfer */ - ta->length = length; /* Size if the region in bytes */ - ta->pages = pages; /* list of pages that are used by buffer */ - ta->n_pages = n_pages; /* number of pages */ - - ta->circular = circular; - ta->circ_to_host = circ_to_host; - - ta->blocks[0].offset = 0; - ta->blocks[0].size = 0; - ta->blocks[1].offset = 0; - ta->blocks[1].size = 0; - ta->used = true; /* This is now a used block */ - - spin_unlock_irq(&ced->staged_lock); - ret = U14ERR_NOERROR; /* say all was well */ - } else { - ret = U14ERR_LOCKFAIL; - goto error; - } - - return ret; - -error: - kfree(pages); - return ret; -} - -/**************************************************************************** -** ced_set_transfer -** -** Sets up a transfer area record. If the area is already set, we attempt to -** unset it. Unsetting will fail if the area is booked, and a transfer to that -** area is in progress. Otherwise, we will release the area and re-assign it. -****************************************************************************/ -int ced_set_transfer(struct ced_data *ced, - struct transfer_area_desc __user *utd) -{ - int ret; - struct transfer_area_desc td; - - if (copy_from_user(&td, utd, sizeof(td))) - return -EFAULT; - - mutex_lock(&ced->io_mutex); - dev_dbg(&ced->interface->dev, "%s: area:%d, size:%08x\n", - __func__, td.wAreaNum, td.dwLength); - /* The strange cast is done so that we don't get warnings in 32-bit */ - /* linux about the size of the pointer. The pointer is always passed */ - /* as a 64-bit object so that we don't have problems using a 32-bit */ - /* program on a 64-bit system. unsigned long is 64-bits on a 64-bit */ - /* system. */ - ret = - ced_set_area(ced, td.wAreaNum, - (char __user *)((unsigned long)td.lpvBuff), td.dwLength, - false, false); - mutex_unlock(&ced->io_mutex); - return ret; -} - -/**************************************************************************** -** ced_unset_transfer -** Erases a transfer area record -****************************************************************************/ -int ced_unset_transfer(struct ced_data *ced, int area) -{ - int ret; - - mutex_lock(&ced->io_mutex); - ret = ced_clear_area(ced, area); - mutex_unlock(&ced->io_mutex); - return ret; -} - -/**************************************************************************** -** ced_set_event -** Creates an event that we can test for based on a transfer to/from an area. -** The area must be setup for a transfer. We attempt to simulate the Windows -** driver behavior for events (as we don't actually use them), which is to -** pretend that whatever the user asked for was achieved, so we return 1 if -** try to create one, and 0 if they ask to remove (assuming all else was OK). -****************************************************************************/ -int ced_set_event(struct ced_data *ced, struct transfer_event __user *ute) -{ - int ret = U14ERR_NOERROR; - struct transfer_event te; - struct transarea *ta; - - /* get a local copy of the data */ - if (copy_from_user(&te, ute, sizeof(te))) - return -EFAULT; - - if (te.wAreaNum >= MAX_TRANSAREAS) /* the area must exist */ - return U14ERR_BADAREA; - - ta = &ced->trans_def[te.wAreaNum]; - - /* make sure we have no competitor */ - mutex_lock(&ced->io_mutex); - spin_lock_irq(&ced->staged_lock); - - if (ta->used) { /* area must be in use */ - ta->event_st = te.dwStart; /* set area regions */ - - /* set size (0 cancels it) */ - ta->event_sz = te.dwLength; - - /* set the direction */ - ta->event_to_host = te.wFlags & 1; - ta->wake_up = 0; /* zero the wake up count */ - } else - ret = U14ERR_NOTSET; - - spin_unlock_irq(&ced->staged_lock); - mutex_unlock(&ced->io_mutex); - - return ret == - U14ERR_NOERROR ? (te.iSetEvent ? 1 : U14ERR_NOERROR) : ret; -} - -/**************************************************************************** -** ced_wait_event -** Sleep the process with a timeout waiting for an event. Returns the number -** of times that a block met the event condition since we last cleared it or -** 0 if timed out, or -ve error (bad area or not set, or signal). -****************************************************************************/ -int ced_wait_event(struct ced_data *ced, int area, int time_out) -{ - int ret; - int wait; - struct transarea *ta; - - if ((unsigned)area >= MAX_TRANSAREAS) - return U14ERR_BADAREA; - - ta = &ced->trans_def[area]; - - /* convert timeout to jiffies */ - time_out = (time_out * HZ + 999) / 1000; - - /* We cannot wait holding the mutex, but we check the flags */ - /* while holding it. This may well be pointless as another */ - /* thread could get in between releasing it and the wait */ - /* call. However, this would have to clear the wake_up flag. */ - /* However, the !ta->used may help us in this case. */ - - /* make sure we have no competitor */ - mutex_lock(&ced->io_mutex); - if (!ta->used || !ta->event_sz) /* check something to */ - /* wait for... */ - return U14ERR_NOTSET; /* ...else we do nothing */ - mutex_unlock(&ced->io_mutex); - - if (time_out) - wait = wait_event_interruptible_timeout(ta->event, - ta->wake_up || - !ta->used, - time_out); - else - wait = wait_event_interruptible(ta->event, - ta->wake_up || - !ta->used); - - if (wait) - ret = -ERESTARTSYS; /* oops - we have had a SIGNAL */ - else - ret = ta->wake_up; /* else the wakeup count */ - - spin_lock_irq(&ced->staged_lock); - ta->wake_up = 0; /* clear the flag */ - spin_unlock_irq(&ced->staged_lock); - - return ret; -} - -/**************************************************************************** -** ced_test_event -** Test the event to see if a ced_wait_event would return immediately. Returns -** the number of times a block completed since the last call, or 0 if none or a -** negative error. -****************************************************************************/ -int ced_test_event(struct ced_data *ced, int area) -{ - int ret; - - if ((unsigned)area >= MAX_TRANSAREAS) - ret = U14ERR_BADAREA; - else { - struct transarea *ta = &ced->trans_def[area]; - - /* make sure we have no competitor */ - mutex_lock(&ced->io_mutex); - spin_lock_irq(&ced->staged_lock); - ret = ta->wake_up; /* get wakeup count since last call */ - ta->wake_up = 0; /* clear the count */ - spin_unlock_irq(&ced->staged_lock); - mutex_unlock(&ced->io_mutex); - } - return ret; -} - -/**************************************************************************** -** ced_get_transferInfo -** Puts the current state of the 1401 in a TGET_TX_BLOCK. -*****************************************************************************/ -int ced_get_transfer(struct ced_data *ced, TGET_TX_BLOCK __user *utx) -{ - int ret = U14ERR_NOERROR; - unsigned int dwIdent; - - mutex_lock(&ced->io_mutex); - dwIdent = ced->staged_id; /* area ident for last xfer */ - if (dwIdent >= MAX_TRANSAREAS) - ret = U14ERR_BADAREA; - else { - /* Return the best information we have - we */ - /* don't have physical addresses */ - TGET_TX_BLOCK *tx; - - tx = kzalloc(sizeof(*tx), GFP_KERNEL); - if (!tx) { - mutex_unlock(&ced->io_mutex); - return -ENOMEM; - } - tx->size = ced->trans_def[dwIdent].length; - tx->linear = (long long)((long)ced->trans_def[dwIdent].buff); - /* how many blocks we could return */ - tx->avail = GET_TX_MAXENTRIES; - tx->used = 1; /* number we actually return */ - tx->entries[0].physical = - (long long)(tx->linear + ced->staged_offset); - tx->entries[0].size = tx->size; - - if (copy_to_user(utx, tx, sizeof(*tx))) - ret = -EFAULT; - kfree(tx); - } - mutex_unlock(&ced->io_mutex); - return ret; -} - -/**************************************************************************** -** ced_kill_io -** -** Empties the host i/o buffers -****************************************************************************/ -int ced_kill_io(struct ced_data *ced) -{ - dev_dbg(&ced->interface->dev, "%s\n", __func__); - mutex_lock(&ced->io_mutex); - ced_flush_out_buff(ced); - ced_flush_in_buff(ced); - mutex_unlock(&ced->io_mutex); - return U14ERR_NOERROR; -} - -/**************************************************************************** -** ced_state_of_1401 -** -** Puts the current state of the 1401 in the Irp return buffer. -*****************************************************************************/ -int ced_state_of_1401(struct ced_data *ced) -{ - int ret; - - mutex_lock(&ced->io_mutex); - - ced_quick_check(ced, false, false); /* get state up to date, no reset */ - ret = ced->current_state; - - mutex_unlock(&ced->io_mutex); - dev_dbg(&ced->interface->dev, "%s: %d\n", __func__, ret); - - return ret; -} - -/**************************************************************************** -** ced_start_self_test -** -** Initiates a self-test cycle. The assumption is that we have no interrupts -** active, so we should make sure that this is the case. -*****************************************************************************/ -int ced_start_self_test(struct ced_data *ced) -{ - int got; - - mutex_lock(&ced->io_mutex); - dev_dbg(&ced->interface->dev, "%s\n", __func__); - - ced_draw_down(ced); /* wait for, then kill outstanding Urbs */ - ced_flush_in_buff(ced); /* Clear out input buffer & pipe */ - ced_flush_out_buff(ced); /* Clear output buffer & pipe */ - /* so things stay tidy */ - /* ced_read_write_cancel(pDeviceObject); */ - ced->dma_flag = MODE_CHAR; /* Clear DMA mode flags here */ - - got = usb_control_msg(ced->udev, usb_rcvctrlpipe(ced->udev, 0), - DB_SELFTEST, (H_TO_D | VENDOR | DEVREQ), - 0, 0, NULL, 0, HZ); /* allow 1 second timeout */ - ced->self_test_time = jiffies + HZ * 30; /* 30 seconds into the */ - /* future */ - - mutex_unlock(&ced->io_mutex); - if (got < 0) - dev_err(&ced->interface->dev, "%s: err=%d\n", __func__, got); - return got < 0 ? U14ERR_FAIL : U14ERR_NOERROR; -} - -/**************************************************************************** -** ced_check_self_test -** -** Check progress of a self-test cycle -****************************************************************************/ -int ced_check_self_test(struct ced_data *ced, TGET_SELFTEST __user *ugst) -{ - unsigned int state, error; - int ret; - TGET_SELFTEST gst; /* local work space */ - - memset(&gst, 0, sizeof(gst)); /* clear out the space (sets code 0) */ - - mutex_lock(&ced->io_mutex); - - dev_dbg(&ced->interface->dev, "%s\n", __func__); - ret = ced_get_state(ced, &state, &error); - if (ret == U14ERR_NOERROR) /* Only accept zero if it happens twice */ - ret = ced_get_state(ced, &state, &error); - - if (ret != U14ERR_NOERROR) { /* Self-test can cause comms errors */ - /* so we assume still testing */ - dev_err(&ced->interface->dev, - "%s: ced_get_state=%d, assuming still testing\n", - __func__, ret); - state = 0x80; /* Force still-testing, no error */ - error = 0; - ret = U14ERR_NOERROR; - } - - if ((state == -1) && (error == -1)) {/* If ced_get_state had problems */ - dev_err(&ced->interface->dev, - "%s: ced_get_state failed, assuming still testing\n", - __func__); - state = 0x80; /* Force still-testing, no error */ - error = 0; - } - - if ((state & 0xFF) == 0x80) { /* If we are still in self-test */ - if (state & 0x00FF0000) { /* Have we got an error? */ - /* read the error code */ - gst.code = (state & 0x00FF0000) >> 16; - gst.x = error & 0x0000FFFF; /* Error data X */ - gst.y = (error & 0xFFFF0000) >> 16; /* and data Y */ - dev_dbg(&ced->interface->dev, - "Self-test error code %d\n", gst.code); - } else { /* No error, check for timeout */ - unsigned long now = jiffies; /* get current time */ - - if (time_after(now, ced->self_test_time)) { - gst.code = -2; /* Flag the timeout */ - dev_dbg(&ced->interface->dev, - "Self-test timed-out\n"); - } else - dev_dbg(&ced->interface->dev, - "Self-test on-going\n"); - } - } else { - gst.code = -1; /* Flag the test is done */ - dev_dbg(&ced->interface->dev, "Self-test done\n"); - } - - if (gst.code < 0) { /* If we have a problem or finished */ - /* If using the 2890 we should reset properly */ - if ((ced->n_pipes == 4) && (ced->type <= TYPEPOWER)) - ced_is_1401(ced); /* Get 1401 reset and OK */ - else - /* Otherwise check without reset unless problems */ - ced_quick_check(ced, true, true); - } - mutex_unlock(&ced->io_mutex); - - if (copy_to_user(ugst, &gst, sizeof(gst))) - return -EFAULT; - - return ret; -} - -/**************************************************************************** -** ced_type_of_1401 -** -** Returns code for standard, plus, micro1401, power1401 or none -****************************************************************************/ -int ced_type_of_1401(struct ced_data *ced) -{ - int ret = TYPEUNKNOWN; - - mutex_lock(&ced->io_mutex); - dev_dbg(&ced->interface->dev, "%s\n", __func__); - - switch (ced->type) { - case TYPE1401: - ret = U14ERR_STD; - break; /* Handle these types directly */ - case TYPEPLUS: - ret = U14ERR_PLUS; - break; - case TYPEU1401: - ret = U14ERR_U1401; - break; - default: - if ((ced->type >= TYPEPOWER) && (ced->type <= 25)) - ret = ced->type + 4; /* We can calculate types */ - else /* for up-coming 1401 designs */ - ret = TYPEUNKNOWN; /* Don't know or not there */ - } - dev_dbg(&ced->interface->dev, "%s %d\n", __func__, ret); - mutex_unlock(&ced->io_mutex); - - return ret; -} - -/**************************************************************************** -** ced_transfer_flags -** -** Returns flags on block transfer abilities -****************************************************************************/ -int ced_transfer_flags(struct ced_data *ced) -{ - /* we always have multiple DMA area diagnostics, notify and circular */ - int ret = U14TF_MULTIA | U14TF_DIAG | - U14TF_NOTIFY | U14TF_CIRCTH; - - dev_dbg(&ced->interface->dev, "%s\n", __func__); - mutex_lock(&ced->io_mutex); - if (ced->is_usb2) /* Set flag for USB2 if appropriate */ - ret |= U14TF_USB2; - mutex_unlock(&ced->io_mutex); - - return ret; -} - -/*************************************************************************** -** ced_dbg_cmd -** Issues a debug\diagnostic command to the 1401 along with a 32-bit datum -** This is a utility command used for dbg operations. -*/ -static int ced_dbg_cmd(struct ced_data *ced, unsigned char cmd, - unsigned int data) -{ - int ret; - - dev_dbg(&ced->interface->dev, "%s: entry\n", __func__); - ret = usb_control_msg(ced->udev, usb_sndctrlpipe(ced->udev, 0), cmd, - (H_TO_D | VENDOR | DEVREQ), - (unsigned short)data, - (unsigned short)(data >> 16), NULL, 0, HZ); - /* allow 1 second timeout */ - if (ret < 0) - dev_err(&ced->interface->dev, "%s: fail code=%d\n", - __func__, ret); - - return ret; -} - -/**************************************************************************** -** ced_dbg_peek -** -** Execute the diagnostic peek operation. Uses address, width and repeats. -****************************************************************************/ -int ced_dbg_peek(struct ced_data *ced, TDBGBLOCK __user *udb) -{ - int ret; - TDBGBLOCK db; - - if (copy_from_user(&db, udb, sizeof(db))) - return -EFAULT; - - mutex_lock(&ced->io_mutex); - dev_dbg(&ced->interface->dev, "%s: @ %08x\n", __func__, db.iAddr); - - ret = ced_dbg_cmd(ced, DB_SETADD, db.iAddr); - if (ret == U14ERR_NOERROR) - ret = ced_dbg_cmd(ced, DB_WIDTH, db.iWidth); - if (ret == U14ERR_NOERROR) - ret = ced_dbg_cmd(ced, DB_REPEATS, db.iRepeats); - if (ret == U14ERR_NOERROR) - ret = ced_dbg_cmd(ced, DB_PEEK, 0); - mutex_unlock(&ced->io_mutex); - - return ret; -} - -/**************************************************************************** -** ced_dbg_poke -** -** Execute the diagnostic poke operation. Parameters are in the CSBLOCK struct -** in order address, size, repeats and value to poke. -****************************************************************************/ -int ced_dbg_poke(struct ced_data *ced, TDBGBLOCK __user *udb) -{ - int ret; - TDBGBLOCK db; - - if (copy_from_user(&db, udb, sizeof(db))) - return -EFAULT; - - mutex_lock(&ced->io_mutex); - dev_dbg(&ced->interface->dev, "%s: @ %08x\n", __func__, db.iAddr); - - ret = ced_dbg_cmd(ced, DB_SETADD, db.iAddr); - if (ret == U14ERR_NOERROR) - ret = ced_dbg_cmd(ced, DB_WIDTH, db.iWidth); - if (ret == U14ERR_NOERROR) - ret = ced_dbg_cmd(ced, DB_REPEATS, db.iRepeats); - if (ret == U14ERR_NOERROR) - ret = ced_dbg_cmd(ced, DB_POKE, db.iData); - mutex_unlock(&ced->io_mutex); - - return ret; -} - -/**************************************************************************** -** ced_dbg_ramp_data -** -** Execute the diagnostic ramp data operation. Parameters are in the CSBLOCK -** struct in order address, default, enable mask, size and repeats. -****************************************************************************/ -int ced_dbg_ramp_data(struct ced_data *ced, TDBGBLOCK __user *udb) -{ - int ret; - TDBGBLOCK db; - - if (copy_from_user(&db, udb, sizeof(db))) - return -EFAULT; - - mutex_lock(&ced->io_mutex); - dev_dbg(&ced->interface->dev, "%s: @ %08x\n", __func__, db.iAddr); - - ret = ced_dbg_cmd(ced, DB_SETADD, db.iAddr); - if (ret == U14ERR_NOERROR) - ret = ced_dbg_cmd(ced, DB_SETDEF, db.iDefault); - if (ret == U14ERR_NOERROR) - ret = ced_dbg_cmd(ced, DB_SETMASK, db.iMask); - if (ret == U14ERR_NOERROR) - ret = ced_dbg_cmd(ced, DB_WIDTH, db.iWidth); - if (ret == U14ERR_NOERROR) - ret = ced_dbg_cmd(ced, DB_REPEATS, db.iRepeats); - if (ret == U14ERR_NOERROR) - ret = ced_dbg_cmd(ced, DB_RAMPD, 0); - mutex_unlock(&ced->io_mutex); - - return ret; -} - -/**************************************************************************** -** ced_dbg_ramp_addr -** -** Execute the diagnostic ramp address operation -****************************************************************************/ -int ced_dbg_ramp_addr(struct ced_data *ced, TDBGBLOCK __user *udb) -{ - int ret; - TDBGBLOCK db; - - if (copy_from_user(&db, udb, sizeof(db))) - return -EFAULT; - - mutex_lock(&ced->io_mutex); - dev_dbg(&ced->interface->dev, "%s\n", __func__); - - ret = ced_dbg_cmd(ced, DB_SETDEF, db.iDefault); - if (ret == U14ERR_NOERROR) - ret = ced_dbg_cmd(ced, DB_SETMASK, db.iMask); - if (ret == U14ERR_NOERROR) - ret = ced_dbg_cmd(ced, DB_WIDTH, db.iWidth); - if (ret == U14ERR_NOERROR) - ret = ced_dbg_cmd(ced, DB_REPEATS, db.iRepeats); - if (ret == U14ERR_NOERROR) - ret = ced_dbg_cmd(ced, DB_RAMPA, 0); - mutex_unlock(&ced->io_mutex); - - return ret; -} - -/**************************************************************************** -** ced_dbg_get_data -** -** Retrieve the data resulting from the last debug Peek operation -****************************************************************************/ -int ced_dbg_get_data(struct ced_data *ced, TDBGBLOCK __user *udb) -{ - int ret; - TDBGBLOCK db; - - memset(&db, 0, sizeof(db)); /* fill returned block with 0s */ - - mutex_lock(&ced->io_mutex); - dev_dbg(&ced->interface->dev, "%s\n", __func__); - - /* Read back the last peeked value from the 1401. */ - ret = usb_control_msg(ced->udev, usb_rcvctrlpipe(ced->udev, 0), - DB_DATA, (D_TO_H | VENDOR | DEVREQ), 0, 0, - &db.iData, sizeof(db.iData), HZ); - if (ret == sizeof(db.iData)) { - if (copy_to_user(udb, &db, sizeof(db))) - ret = -EFAULT; - else - ret = U14ERR_NOERROR; - } else - dev_err(&ced->interface->dev, "%s: failed, code %d\n", - __func__, ret); - - mutex_unlock(&ced->io_mutex); - - return ret; -} - -/**************************************************************************** -** ced_dbg_stop_loop -** -** Stop any never-ending debug loop, we just call ced_get_state for USB -** -****************************************************************************/ -int ced_dbg_stop_loop(struct ced_data *ced) -{ - int ret; - unsigned int uState, uErr; - - mutex_lock(&ced->io_mutex); - dev_dbg(&ced->interface->dev, "%s\n", __func__); - ret = ced_get_state(ced, &uState, &uErr); - mutex_unlock(&ced->io_mutex); - - return ret; -} - -/**************************************************************************** -** ced_set_circular -** -** Sets up a transfer area record for circular transfers. If the area is -** already set, we attempt to unset it. Unsetting will fail if the area is -** booked and a transfer to that area is in progress. Otherwise, we will -** release the area and re-assign it. -****************************************************************************/ -int ced_set_circular(struct ced_data *ced, - struct transfer_area_desc __user *utd) -{ - int ret; - bool to_host; - struct transfer_area_desc td; - - if (copy_from_user(&td, utd, sizeof(td))) - return -EFAULT; - - mutex_lock(&ced->io_mutex); - dev_dbg(&ced->interface->dev, "%s: area:%d, size:%08x\n", - __func__, td.wAreaNum, td.dwLength); - to_host = td.eSize != 0; /* this is used as the tohost flag */ - - /* The strange cast is done so that we don't get warnings in 32-bit */ - /* linux about the size of the pointer. The pointer is always passed */ - /* as a 64-bit object so that we don't have problems using a 32-bit */ - /* program on a 64-bit system. unsigned long is 64-bits on a 64-bit */ - /* system. */ - ret = - ced_set_area(ced, td.wAreaNum, - (char __user *)((unsigned long)td.lpvBuff), td.dwLength, - true, to_host); - mutex_unlock(&ced->io_mutex); - return ret; -} - -/**************************************************************************** -** ced_get_circ_block -** -** Return the next available block of circularly-transferred data. -****************************************************************************/ -int ced_get_circ_block(struct ced_data *ced, TCIRCBLOCK __user *ucb) -{ - int ret = U14ERR_NOERROR; - unsigned int area; - TCIRCBLOCK cb; - - dev_dbg(&ced->interface->dev, "%s\n", __func__); - - if (copy_from_user(&cb, ucb, sizeof(cb))) - return -EFAULT; - - mutex_lock(&ced->io_mutex); - - area = cb.nArea; /* Retrieve parameters first */ - cb.dwOffset = 0; /* set default result (nothing) */ - cb.dwSize = 0; - - if (area < MAX_TRANSAREAS) { /* The area number must be OK */ - /* Pointer to relevant info */ - struct transarea *ta = &ced->trans_def[area]; - - spin_lock_irq(&ced->staged_lock); /* Lock others out */ - - if ((ta->used) && (ta->circular) && /* Must be circular area */ - (ta->circ_to_host)) { /* For now at least must be to host */ - if (ta->blocks[0].size > 0) { /* Got anything? */ - cb.dwOffset = ta->blocks[0].offset; - cb.dwSize = ta->blocks[0].size; - dev_dbg(&ced->interface->dev, - "%s: return block 0: %d bytes at %d\n", - __func__, cb.dwSize, cb.dwOffset); - } - } else - ret = U14ERR_NOTSET; - - spin_unlock_irq(&ced->staged_lock); - } else - ret = U14ERR_BADAREA; - - if (copy_to_user(ucb, &cb, sizeof(cb))) - ret = -EFAULT; - - mutex_unlock(&ced->io_mutex); - return ret; -} - -/**************************************************************************** -** ced_free_circ_block -** -** Frees a block of circularly-transferred data and returns the next one. -****************************************************************************/ -int ced_free_circ_block(struct ced_data *ced, TCIRCBLOCK __user *ucb) -{ - int ret = U14ERR_NOERROR; - unsigned int area, start, size; - TCIRCBLOCK cb; - - dev_dbg(&ced->interface->dev, "%s\n", __func__); - - if (copy_from_user(&cb, ucb, sizeof(cb))) - return -EFAULT; - - mutex_lock(&ced->io_mutex); - - area = cb.nArea; /* Retrieve parameters first */ - start = cb.dwOffset; - size = cb.dwSize; - cb.dwOffset = 0; /* then set default result (nothing) */ - cb.dwSize = 0; - - if (area < MAX_TRANSAREAS) { /* The area number must be OK */ - /* Pointer to relevant info */ - struct transarea *ta = &ced->trans_def[area]; - - spin_lock_irq(&ced->staged_lock); /* Lock others out */ - - if ((ta->used) && (ta->circular) && /* Must be circular area */ - (ta->circ_to_host)) { /* For now at least must be to host */ - bool waiting = false; - - if ((ta->blocks[0].size >= size) && /* Got anything? */ - /* Must be legal data */ - (ta->blocks[0].offset == start)) { - ta->blocks[0].size -= size; - ta->blocks[0].offset += size; - - /* Have we emptied this block? */ - if (ta->blocks[0].size == 0) { - /* Is there a second block? */ - if (ta->blocks[1].size) { - /* Copy down block 2 data */ - ta->blocks[0] = ta->blocks[1]; - /* and mark the second */ - /* block as unused */ - ta->blocks[1].size = 0; - ta->blocks[1].offset = 0; - } else - ta->blocks[0].offset = 0; - } - - dev_dbg(&ced->interface->dev, - "%s: free %d bytes at %d, " - "return %d bytes at %d, wait=%d\n", - __func__, size, start, - ta->blocks[0].size, - ta->blocks[0].offset, - ced->xfer_waiting); - - /* Return the next available block of */ - /* memory as well */ - if (ta->blocks[0].size > 0) {/* Got anything? */ - cb.dwOffset = - ta->blocks[0].offset; - cb.dwSize = ta->blocks[0].size; - } - - waiting = ced->xfer_waiting; - if (waiting && ced->staged_urb_pending) { - dev_err(&ced->interface->dev, - "%s: ERROR: waiting xfer and " - "staged Urb pending!\n", - __func__); - waiting = false; - } - } else { - dev_err(&ced->interface->dev, - "%s: ERROR: freeing %d bytes at %d, " - "block 0 is %d bytes at %d\n", - __func__, size, start, - ta->blocks[0].size, - ta->blocks[0].offset); - ret = U14ERR_NOMEMORY; - } - - /* If we have one, kick off pending transfer */ - if (waiting) { /* Got a block xfer waiting? */ - int RWMStat = - ced_read_write_mem(ced, - !ced->dma_info.outward, - ced->dma_info.ident, - ced->dma_info.offset, - ced->dma_info.size); - if (RWMStat != U14ERR_NOERROR) - dev_err(&ced->interface->dev, - "%s: rw setup failed %d\n", - __func__, RWMStat); - } - } else - ret = U14ERR_NOTSET; - - spin_unlock_irq(&ced->staged_lock); - } else - ret = U14ERR_BADAREA; - - if (copy_to_user(ucb, &cb, sizeof(cb))) - ret = -EFAULT; - - mutex_unlock(&ced->io_mutex); - return ret; -} |
