diff options
Diffstat (limited to 'drivers/staging/comedi/drivers.c')
| -rw-r--r-- | drivers/staging/comedi/drivers.c | 1198 |
1 files changed, 510 insertions, 688 deletions
diff --git a/drivers/staging/comedi/drivers.c b/drivers/staging/comedi/drivers.c index 4a29ed737e3..299726f39e2 100644 --- a/drivers/staging/comedi/drivers.c +++ b/drivers/staging/comedi/drivers.c @@ -14,26 +14,15 @@ 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., 675 Mass Ave, Cambridge, MA 02139, USA. - */ -#define _GNU_SOURCE - -#define __NO_VERSION__ -#include "comedi_fops.h" #include <linux/device.h> #include <linux/module.h> -#include <linux/pci.h> -#include <linux/usb.h> #include <linux/errno.h> +#include <linux/kconfig.h> #include <linux/kernel.h> #include <linux/sched.h> #include <linux/fcntl.h> -#include <linux/delay.h> #include <linux/ioport.h> #include <linux/mm.h> #include <linux/slab.h> @@ -42,29 +31,80 @@ #include <linux/cdev.h> #include <linux/dma-mapping.h> #include <linux/io.h> -#include <asm/system.h> +#include <linux/interrupt.h> +#include <linux/firmware.h> #include "comedidev.h" -#include "internal.h" - -static int postconfig(struct comedi_device *dev); -static int insn_rw_emulate_bits(struct comedi_device *dev, - struct comedi_subdevice *s, - struct comedi_insn *insn, unsigned int *data); -static void *comedi_recognize(struct comedi_driver *driv, const char *name); -static void comedi_report_boards(struct comedi_driver *driv); -static int poll_invalid(struct comedi_device *dev, struct comedi_subdevice *s); +#include "comedi_internal.h" struct comedi_driver *comedi_drivers; +DEFINE_MUTEX(comedi_drivers_list_lock); + +int comedi_set_hw_dev(struct comedi_device *dev, struct device *hw_dev) +{ + if (hw_dev == dev->hw_dev) + return 0; + if (dev->hw_dev != NULL) + return -EEXIST; + dev->hw_dev = get_device(hw_dev); + return 0; +} +EXPORT_SYMBOL_GPL(comedi_set_hw_dev); + +static void comedi_clear_hw_dev(struct comedi_device *dev) +{ + put_device(dev->hw_dev); + dev->hw_dev = NULL; +} + +/** + * comedi_alloc_devpriv() - Allocate memory for the device private data. + * @dev: comedi_device struct + * @size: size of the memory to allocate + */ +void *comedi_alloc_devpriv(struct comedi_device *dev, size_t size) +{ + dev->private = kzalloc(size, GFP_KERNEL); + return dev->private; +} +EXPORT_SYMBOL_GPL(comedi_alloc_devpriv); + +int comedi_alloc_subdevices(struct comedi_device *dev, int num_subdevices) +{ + struct comedi_subdevice *s; + int i; -static void cleanup_device(struct comedi_device *dev) + if (num_subdevices < 1) + return -EINVAL; + + s = kcalloc(num_subdevices, sizeof(*s), GFP_KERNEL); + if (!s) + return -ENOMEM; + dev->subdevices = s; + dev->n_subdevices = num_subdevices; + + for (i = 0; i < num_subdevices; ++i) { + s = &dev->subdevices[i]; + s->device = dev; + s->index = i; + s->async_dma_dir = DMA_NONE; + spin_lock_init(&s->spin_lock); + s->minor = -1; + } + return 0; +} +EXPORT_SYMBOL_GPL(comedi_alloc_subdevices); + +static void comedi_device_detach_cleanup(struct comedi_device *dev) { int i; struct comedi_subdevice *s; if (dev->subdevices) { for (i = 0; i < dev->n_subdevices; i++) { - s = dev->subdevices + i; + s = &dev->subdevices[i]; + if (s->runflags & SRF_FREE_SPRIV) + kfree(s->private); comedi_free_subdevice_minor(s); if (s->async) { comedi_buf_alloc(dev, s, 0); @@ -81,202 +121,240 @@ static void cleanup_device(struct comedi_device *dev) dev->board_name = NULL; dev->board_ptr = NULL; dev->iobase = 0; + dev->iolen = 0; + dev->ioenabled = false; dev->irq = 0; dev->read_subdev = NULL; dev->write_subdev = NULL; dev->open = NULL; dev->close = NULL; - comedi_set_hw_dev(dev, NULL); + comedi_clear_hw_dev(dev); } -static void __comedi_device_detach(struct comedi_device *dev) +void comedi_device_detach(struct comedi_device *dev) { - dev->attached = 0; + comedi_device_cancel_all(dev); + down_write(&dev->attach_lock); + dev->attached = false; + dev->detach_count++; if (dev->driver) dev->driver->detach(dev); - else - printk(KERN_WARNING - "BUG: dev->driver=NULL in comedi_device_detach()\n"); - cleanup_device(dev); + comedi_device_detach_cleanup(dev); + up_write(&dev->attach_lock); } -void comedi_device_detach(struct comedi_device *dev) +static int poll_invalid(struct comedi_device *dev, struct comedi_subdevice *s) { - if (!dev->attached) - return; - __comedi_device_detach(dev); + return -EINVAL; } -int comedi_device_attach(struct comedi_device *dev, struct comedi_devconfig *it) +int insn_inval(struct comedi_device *dev, struct comedi_subdevice *s, + struct comedi_insn *insn, unsigned int *data) { - struct comedi_driver *driv; - int ret; - - if (dev->attached) - return -EBUSY; - - for (driv = comedi_drivers; driv; driv = driv->next) { - if (!try_module_get(driv->module)) { - printk - (KERN_INFO "comedi: failed to increment module count, skipping\n"); - continue; - } - if (driv->num_names) { - dev->board_ptr = comedi_recognize(driv, it->board_name); - if (dev->board_ptr == NULL) { - module_put(driv->module); - continue; - } - } else { - if (strcmp(driv->driver_name, it->board_name)) { - module_put(driv->module); - continue; - } - } - /* initialize dev->driver here so - * comedi_error() can be called from attach */ - dev->driver = driv; - ret = driv->attach(dev, it); - if (ret < 0) { - module_put(dev->driver->module); - __comedi_device_detach(dev); - return ret; - } - goto attached; - } + return -EINVAL; +} - /* recognize has failed if we get here */ - /* report valid board names before returning error */ - for (driv = comedi_drivers; driv; driv = driv->next) { - if (!try_module_get(driv->module)) { - printk(KERN_INFO - "comedi: failed to increment module count\n"); - continue; - } - comedi_report_boards(driv); - module_put(driv->module); - } - return -EIO; +/** + * comedi_timeout() - busy-wait for a driver condition to occur. + * @dev: comedi_device struct + * @s: comedi_subdevice struct + * @insn: comedi_insn struct + * @cb: callback to check for the condition + * @context: private context from the driver + */ +int comedi_timeout(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_insn *insn, + int (*cb)(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_insn *insn, + unsigned long context), + unsigned long context) +{ + unsigned long timeout = jiffies + msecs_to_jiffies(COMEDI_TIMEOUT_MS); + int ret; -attached: - /* do a little post-config cleanup */ - ret = postconfig(dev); - module_put(dev->driver->module); - if (ret < 0) { - __comedi_device_detach(dev); - return ret; + while (time_before(jiffies, timeout)) { + ret = cb(dev, s, insn, context); + if (ret != -EBUSY) + return ret; /* success (0) or non EBUSY errno */ + cpu_relax(); } - - if (!dev->board_name) { - printk(KERN_WARNING "BUG: dev->board_name=<%p>\n", - dev->board_name); - dev->board_name = "BUG"; + return -ETIMEDOUT; +} +EXPORT_SYMBOL_GPL(comedi_timeout); + +/** + * comedi_dio_insn_config() - boilerplate (*insn_config) for DIO subdevices. + * @dev: comedi_device struct + * @s: comedi_subdevice struct + * @insn: comedi_insn struct + * @data: parameters for the @insn + * @mask: io_bits mask for grouped channels + */ +int comedi_dio_insn_config(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_insn *insn, + unsigned int *data, + unsigned int mask) +{ + unsigned int chan_mask = 1 << CR_CHAN(insn->chanspec); + + if (!mask) + mask = chan_mask; + + switch (data[0]) { + case INSN_CONFIG_DIO_INPUT: + s->io_bits &= ~mask; + break; + + case INSN_CONFIG_DIO_OUTPUT: + s->io_bits |= mask; + break; + + case INSN_CONFIG_DIO_QUERY: + data[1] = (s->io_bits & mask) ? COMEDI_OUTPUT : COMEDI_INPUT; + return insn->n; + + default: + return -EINVAL; } - smp_wmb(); - dev->attached = 1; return 0; } +EXPORT_SYMBOL_GPL(comedi_dio_insn_config); -int comedi_driver_register(struct comedi_driver *driver) +/** + * comedi_dio_update_state() - update the internal state of DIO subdevices. + * @s: comedi_subdevice struct + * @data: the channel mask and bits to update + */ +unsigned int comedi_dio_update_state(struct comedi_subdevice *s, + unsigned int *data) { - driver->next = comedi_drivers; - comedi_drivers = driver; + unsigned int chanmask = (s->n_chan < 32) ? ((1 << s->n_chan) - 1) + : 0xffffffff; + unsigned int mask = data[0] & chanmask; + unsigned int bits = data[1]; - return 0; + if (mask) { + s->state &= ~mask; + s->state |= (bits & mask); + } + + return mask; } -EXPORT_SYMBOL(comedi_driver_register); +EXPORT_SYMBOL_GPL(comedi_dio_update_state); -int comedi_driver_unregister(struct comedi_driver *driver) +static int insn_rw_emulate_bits(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_insn *insn, unsigned int *data) { - struct comedi_driver *prev; - int i; + struct comedi_insn new_insn; + int ret; + static const unsigned channels_per_bitfield = 32; - /* check for devices using this driver */ - for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) { - struct comedi_device_file_info *dev_file_info = - comedi_get_device_file_info(i); - struct comedi_device *dev; + unsigned chan = CR_CHAN(insn->chanspec); + const unsigned base_bitfield_channel = + (chan < channels_per_bitfield) ? 0 : chan; + unsigned int new_data[2]; - if (dev_file_info == NULL) - continue; - dev = dev_file_info->device; + memset(new_data, 0, sizeof(new_data)); + memset(&new_insn, 0, sizeof(new_insn)); + new_insn.insn = INSN_BITS; + new_insn.chanspec = base_bitfield_channel; + new_insn.n = 2; + new_insn.subdev = insn->subdev; - mutex_lock(&dev->mutex); - if (dev->attached && dev->driver == driver) { - if (dev->use_count) - printk - (KERN_WARNING "BUG! detaching device with use_count=%d\n", - dev->use_count); - comedi_device_detach(dev); - } - mutex_unlock(&dev->mutex); + if (insn->insn == INSN_WRITE) { + if (!(s->subdev_flags & SDF_WRITABLE)) + return -EINVAL; + new_data[0] = 1 << (chan - base_bitfield_channel); /* mask */ + new_data[1] = data[0] ? (1 << (chan - base_bitfield_channel)) + : 0; /* bits */ } - if (comedi_drivers == driver) { - comedi_drivers = driver->next; - return 0; + ret = s->insn_bits(dev, s, &new_insn, new_data); + if (ret < 0) + return ret; + + if (insn->insn == INSN_READ) + data[0] = (new_data[1] >> (chan - base_bitfield_channel)) & 1; + + return 1; +} + +static int __comedi_device_postconfig_async(struct comedi_device *dev, + struct comedi_subdevice *s) +{ + struct comedi_async *async; + unsigned int buf_size; + int ret; + + if ((s->subdev_flags & (SDF_CMD_READ | SDF_CMD_WRITE)) == 0) { + dev_warn(dev->class_dev, + "async subdevices must support SDF_CMD_READ or SDF_CMD_WRITE\n"); + return -EINVAL; + } + if (!s->do_cmdtest) { + dev_warn(dev->class_dev, + "async subdevices must have a do_cmdtest() function\n"); + return -EINVAL; } - for (prev = comedi_drivers; prev->next; prev = prev->next) { - if (prev->next == driver) { - prev->next = driver->next; - return 0; - } + async = kzalloc(sizeof(*async), GFP_KERNEL); + if (!async) + return -ENOMEM; + + init_waitqueue_head(&async->wait_head); + s->async = async; + + async->max_bufsize = comedi_default_buf_maxsize_kb * 1024; + buf_size = comedi_default_buf_size_kb * 1024; + if (buf_size > async->max_bufsize) + buf_size = async->max_bufsize; + + if (comedi_buf_alloc(dev, s, buf_size) < 0) { + dev_warn(dev->class_dev, "Buffer allocation failed\n"); + return -ENOMEM; } - return -EINVAL; + if (s->buf_change) { + ret = s->buf_change(dev, s, buf_size); + if (ret < 0) + return ret; + } + + comedi_alloc_subdevice_minor(s); + + return 0; } -EXPORT_SYMBOL(comedi_driver_unregister); -static int postconfig(struct comedi_device *dev) +static int __comedi_device_postconfig(struct comedi_device *dev) { - int i; struct comedi_subdevice *s; - struct comedi_async *async = NULL; int ret; + int i; for (i = 0; i < dev->n_subdevices; i++) { - s = dev->subdevices + i; + s = &dev->subdevices[i]; if (s->type == COMEDI_SUBD_UNUSED) continue; + if (s->type == COMEDI_SUBD_DO) { + if (s->n_chan < 32) + s->io_bits = (1 << s->n_chan) - 1; + else + s->io_bits = 0xffffffff; + } + if (s->len_chanlist == 0) s->len_chanlist = 1; if (s->do_cmd) { - BUG_ON((s->subdev_flags & (SDF_CMD_READ | - SDF_CMD_WRITE)) == 0); - BUG_ON(!s->do_cmdtest); - - async = - kzalloc(sizeof(struct comedi_async), GFP_KERNEL); - if (async == NULL) { - printk(KERN_INFO - "failed to allocate async struct\n"); - return -ENOMEM; - } - init_waitqueue_head(&async->wait_head); - async->subdevice = s; - s->async = async; - -#define DEFAULT_BUF_MAXSIZE (64*1024) -#define DEFAULT_BUF_SIZE (64*1024) - - async->max_bufsize = DEFAULT_BUF_MAXSIZE; - - async->prealloc_buf = NULL; - async->prealloc_bufsz = 0; - if (comedi_buf_alloc(dev, s, DEFAULT_BUF_SIZE) < 0) { - printk(KERN_INFO "Buffer allocation failed\n"); - return -ENOMEM; - } - if (s->buf_change) { - ret = s->buf_change(dev, s, DEFAULT_BUF_SIZE); - if (ret < 0) - return ret; - } - comedi_alloc_subdevice_minor(dev, s); + ret = __comedi_device_postconfig_async(dev, s); + if (ret) + return ret; } if (!s->range_table && !s->range_table_list) @@ -303,18 +381,55 @@ static int postconfig(struct comedi_device *dev) return 0; } -/* generic recognize function for drivers - * that register their supported board names */ +/* do a little post-config cleanup */ +static int comedi_device_postconfig(struct comedi_device *dev) +{ + int ret; + + ret = __comedi_device_postconfig(dev); + if (ret < 0) + return ret; + down_write(&dev->attach_lock); + dev->attached = true; + up_write(&dev->attach_lock); + return 0; +} + +/* + * Generic recognize function for drivers that register their supported + * board names. + * + * 'driv->board_name' points to a 'const char *' member within the + * zeroth element of an array of some private board information + * structure, say 'struct foo_board' containing a member 'const char + * *board_name' that is initialized to point to a board name string that + * is one of the candidates matched against this function's 'name' + * parameter. + * + * 'driv->offset' is the size of the private board information + * structure, say 'sizeof(struct foo_board)', and 'driv->num_names' is + * the length of the array of private board information structures. + * + * If one of the board names in the array of private board information + * structures matches the name supplied to this function, the function + * returns a pointer to the pointer to the board name, otherwise it + * returns NULL. The return value ends up in the 'board_ptr' member of + * a 'struct comedi_device' that the low-level comedi driver's + * 'attach()' hook can convert to a point to a particular element of its + * array of private board information structures by subtracting the + * offset of the member that points to the board name. (No subtraction + * is required if the board name pointer is the first member of the + * private board information structure, which is generally the case.) + */ static void *comedi_recognize(struct comedi_driver *driv, const char *name) { - unsigned i; - const char *const *name_ptr = driv->board_name; + char **name_ptr = (char **)driv->board_name; + int i; + for (i = 0; i < driv->num_names; i++) { if (strcmp(*name_ptr, name) == 0) - return (void *)name_ptr; - name_ptr = - (const char *const *)((const char *)name_ptr + - driv->offset); + return name_ptr; + name_ptr = (void *)name_ptr + driv->offset; } return NULL; @@ -325,580 +440,287 @@ static void comedi_report_boards(struct comedi_driver *driv) unsigned int i; const char *const *name_ptr; - printk(KERN_INFO "comedi: valid board names for %s driver are:\n", - driv->driver_name); + pr_info("comedi: valid board names for %s driver are:\n", + driv->driver_name); name_ptr = driv->board_name; for (i = 0; i < driv->num_names; i++) { - printk(KERN_INFO " %s\n", *name_ptr); + pr_info(" %s\n", *name_ptr); name_ptr = (const char **)((char *)name_ptr + driv->offset); } if (driv->num_names == 0) - printk(KERN_INFO " %s\n", driv->driver_name); -} - -static int poll_invalid(struct comedi_device *dev, struct comedi_subdevice *s) -{ - return -EINVAL; -} - -int insn_inval(struct comedi_device *dev, struct comedi_subdevice *s, - struct comedi_insn *insn, unsigned int *data) -{ - return -EINVAL; -} - -static int insn_rw_emulate_bits(struct comedi_device *dev, - struct comedi_subdevice *s, - struct comedi_insn *insn, unsigned int *data) -{ - struct comedi_insn new_insn; + pr_info(" %s\n", driv->driver_name); +} + +/** + * comedi_load_firmware() - Request and load firmware for a device. + * @dev: comedi_device struct + * @hw_device: device struct for the comedi_device + * @name: the name of the firmware image + * @cb: callback to the upload the firmware image + * @context: private context from the driver + */ +int comedi_load_firmware(struct comedi_device *dev, + struct device *device, + const char *name, + int (*cb)(struct comedi_device *dev, + const u8 *data, size_t size, + unsigned long context), + unsigned long context) +{ + const struct firmware *fw; int ret; - static const unsigned channels_per_bitfield = 32; - unsigned chan = CR_CHAN(insn->chanspec); - const unsigned base_bitfield_channel = - (chan < channels_per_bitfield) ? 0 : chan; - unsigned int new_data[2]; - memset(new_data, 0, sizeof(new_data)); - memset(&new_insn, 0, sizeof(new_insn)); - new_insn.insn = INSN_BITS; - new_insn.chanspec = base_bitfield_channel; - new_insn.n = 2; - new_insn.data = new_data; - new_insn.subdev = insn->subdev; + if (!cb) + return -EINVAL; - if (insn->insn == INSN_WRITE) { - if (!(s->subdev_flags & SDF_WRITABLE)) - return -EINVAL; - new_data[0] = 1 << (chan - base_bitfield_channel); /* mask */ - new_data[1] = data[0] ? (1 << (chan - base_bitfield_channel)) - : 0; /* bits */ + ret = request_firmware(&fw, name, device); + if (ret == 0) { + ret = cb(dev, fw->data, fw->size, context); + release_firmware(fw); } - ret = s->insn_bits(dev, s, &new_insn, new_data); - if (ret < 0) - return ret; - - if (insn->insn == INSN_READ) - data[0] = (new_data[1] >> (chan - base_bitfield_channel)) & 1; - - return 1; + return ret < 0 ? ret : 0; } +EXPORT_SYMBOL_GPL(comedi_load_firmware); -static inline unsigned long uvirt_to_kva(pgd_t *pgd, unsigned long adr) +/** + * __comedi_request_region() - Request an I/O reqion for a legacy driver. + * @dev: comedi_device struct + * @start: base address of the I/O reqion + * @len: length of the I/O region + */ +int __comedi_request_region(struct comedi_device *dev, + unsigned long start, unsigned long len) { - unsigned long ret = 0UL; - pmd_t *pmd; - pte_t *ptep, pte; - pud_t *pud; - - if (!pgd_none(*pgd)) { - pud = pud_offset(pgd, adr); - pmd = pmd_offset(pud, adr); - if (!pmd_none(*pmd)) { - ptep = pte_offset_kernel(pmd, adr); - pte = *ptep; - if (pte_present(pte)) { - ret = (unsigned long) - page_address(pte_page(pte)); - ret |= (adr & (PAGE_SIZE - 1)); - } - } + if (!start) { + dev_warn(dev->class_dev, + "%s: a I/O base address must be specified\n", + dev->board_name); + return -EINVAL; } - return ret; -} -static inline unsigned long kvirt_to_kva(unsigned long adr) -{ - unsigned long va, kva; - - va = adr; - kva = uvirt_to_kva(pgd_offset_k(va), va); + if (!request_region(start, len, dev->board_name)) { + dev_warn(dev->class_dev, "%s: I/O port conflict (%#lx,%lu)\n", + dev->board_name, start, len); + return -EIO; + } - return kva; + return 0; } +EXPORT_SYMBOL_GPL(__comedi_request_region); -int comedi_buf_alloc(struct comedi_device *dev, struct comedi_subdevice *s, - unsigned long new_size) +/** + * comedi_request_region() - Request an I/O reqion for a legacy driver. + * @dev: comedi_device struct + * @start: base address of the I/O reqion + * @len: length of the I/O region + */ +int comedi_request_region(struct comedi_device *dev, + unsigned long start, unsigned long len) { - struct comedi_async *async = s->async; - - /* Round up new_size to multiple of PAGE_SIZE */ - new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK; - - /* if no change is required, do nothing */ - if (async->prealloc_buf && async->prealloc_bufsz == new_size) - return 0; + int ret; - /* deallocate old buffer */ - if (async->prealloc_buf) { - vunmap(async->prealloc_buf); - async->prealloc_buf = NULL; - async->prealloc_bufsz = 0; - } - if (async->buf_page_list) { - unsigned i; - for (i = 0; i < async->n_buf_pages; ++i) { - if (async->buf_page_list[i].virt_addr) { - clear_bit(PG_reserved, &(virt_to_page(async->buf_page_list[i].virt_addr)->flags)); - if (s->async_dma_dir != DMA_NONE) { - dma_free_coherent(dev->hw_dev, - PAGE_SIZE, - async-> - buf_page_list - [i].virt_addr, - async-> - buf_page_list - [i].dma_addr); - } else { - free_page((unsigned long) - async->buf_page_list[i]. - virt_addr); - } - } - } - vfree(async->buf_page_list); - async->buf_page_list = NULL; - async->n_buf_pages = 0; + ret = __comedi_request_region(dev, start, len); + if (ret == 0) { + dev->iobase = start; + dev->iolen = len; } - /* allocate new buffer */ - if (new_size) { - unsigned i = 0; - unsigned n_pages = new_size >> PAGE_SHIFT; - struct page **pages = NULL; - - async->buf_page_list = - vmalloc(sizeof(struct comedi_buf_page) * n_pages); - if (async->buf_page_list) { - memset(async->buf_page_list, 0, - sizeof(struct comedi_buf_page) * n_pages); - pages = vmalloc(sizeof(struct page *) * n_pages); - } - if (pages) { - for (i = 0; i < n_pages; i++) { - if (s->async_dma_dir != DMA_NONE) { - async->buf_page_list[i].virt_addr = - dma_alloc_coherent(dev->hw_dev, - PAGE_SIZE, - &async-> - buf_page_list - [i].dma_addr, - GFP_KERNEL | - __GFP_COMP); - } else { - async->buf_page_list[i].virt_addr = - (void *) - get_zeroed_page(GFP_KERNEL); - } - if (async->buf_page_list[i].virt_addr == NULL) - break; - - set_bit(PG_reserved, - &(virt_to_page(async->buf_page_list[i].virt_addr)->flags)); - pages[i] = virt_to_page(async->buf_page_list[i].virt_addr); - } - } - if (i == n_pages) { - async->prealloc_buf = - vmap(pages, n_pages, VM_MAP, PAGE_KERNEL_NOCACHE); - } - vfree(pages); - - if (async->prealloc_buf == NULL) { - /* Some allocation failed above. */ - if (async->buf_page_list) { - for (i = 0; i < n_pages; i++) { - if (async->buf_page_list[i].virt_addr == - NULL) { - break; - } - clear_bit(PG_reserved, &(virt_to_page(async->buf_page_list[i].virt_addr)->flags)); - if (s->async_dma_dir != DMA_NONE) { - dma_free_coherent(dev->hw_dev, - PAGE_SIZE, - async-> - buf_page_list - [i].virt_addr, - async-> - buf_page_list - [i].dma_addr); - } else { - free_page((unsigned long) - async->buf_page_list - [i].virt_addr); - } - } - vfree(async->buf_page_list); - async->buf_page_list = NULL; - } - return -ENOMEM; - } - async->n_buf_pages = n_pages; - } - async->prealloc_bufsz = new_size; - return 0; + return ret; } +EXPORT_SYMBOL_GPL(comedi_request_region); -/* munging is applied to data by core as it passes between user - * and kernel space */ -static unsigned int comedi_buf_munge(struct comedi_async *async, - unsigned int num_bytes) +/** + * comedi_legacy_detach() - A generic (*detach) function for legacy drivers. + * @dev: comedi_device struct + */ +void comedi_legacy_detach(struct comedi_device *dev) { - struct comedi_subdevice *s = async->subdevice; - unsigned int count = 0; - const unsigned num_sample_bytes = bytes_per_sample(s); - - if (s->munge == NULL || (async->cmd.flags & CMDF_RAWDATA)) { - async->munge_count += num_bytes; - BUG_ON((int)(async->munge_count - async->buf_write_count) > 0); - return num_bytes; + if (dev->irq) { + free_irq(dev->irq, dev); + dev->irq = 0; } - /* don't munge partial samples */ - num_bytes -= num_bytes % num_sample_bytes; - while (count < num_bytes) { - int block_size; - - block_size = num_bytes - count; - if (block_size < 0) { - printk(KERN_WARNING - "%s: %s: bug! block_size is negative\n", - __FILE__, __func__); - break; - } - if ((int)(async->munge_ptr + block_size - - async->prealloc_bufsz) > 0) - block_size = async->prealloc_bufsz - async->munge_ptr; - - s->munge(s->device, s, async->prealloc_buf + async->munge_ptr, - block_size, async->munge_chan); - - smp_wmb(); /* barrier insures data is munged in buffer - * before munge_count is incremented */ - - async->munge_chan += block_size / num_sample_bytes; - async->munge_chan %= async->cmd.chanlist_len; - async->munge_count += block_size; - async->munge_ptr += block_size; - async->munge_ptr %= async->prealloc_bufsz; - count += block_size; + if (dev->iobase && dev->iolen) { + release_region(dev->iobase, dev->iolen); + dev->iobase = 0; + dev->iolen = 0; } - BUG_ON((int)(async->munge_count - async->buf_write_count) > 0); - return count; } +EXPORT_SYMBOL_GPL(comedi_legacy_detach); -unsigned int comedi_buf_write_n_available(struct comedi_async *async) -{ - unsigned int free_end; - unsigned int nbytes; - - if (async == NULL) - return 0; - - free_end = async->buf_read_count + async->prealloc_bufsz; - nbytes = free_end - async->buf_write_alloc_count; - nbytes -= nbytes % bytes_per_sample(async->subdevice); - /* barrier insures the read of buf_read_count in this - query occurs before any following writes to the buffer which - might be based on the return value from this query. - */ - smp_mb(); - return nbytes; -} - -/* allocates chunk for the writer from free buffer space */ -unsigned int comedi_buf_write_alloc(struct comedi_async *async, - unsigned int nbytes) -{ - unsigned int free_end = async->buf_read_count + async->prealloc_bufsz; - - if ((int)(async->buf_write_alloc_count + nbytes - free_end) > 0) - nbytes = free_end - async->buf_write_alloc_count; - - async->buf_write_alloc_count += nbytes; - /* barrier insures the read of buf_read_count above occurs before - we write data to the write-alloc'ed buffer space */ - smp_mb(); - return nbytes; -} -EXPORT_SYMBOL(comedi_buf_write_alloc); - -/* allocates nothing unless it can completely fulfill the request */ -unsigned int comedi_buf_write_alloc_strict(struct comedi_async *async, - unsigned int nbytes) +int comedi_device_attach(struct comedi_device *dev, struct comedi_devconfig *it) { - unsigned int free_end = async->buf_read_count + async->prealloc_bufsz; - - if ((int)(async->buf_write_alloc_count + nbytes - free_end) > 0) - nbytes = 0; + struct comedi_driver *driv; + int ret; - async->buf_write_alloc_count += nbytes; - /* barrier insures the read of buf_read_count above occurs before - we write data to the write-alloc'ed buffer space */ - smp_mb(); - return nbytes; -} + if (dev->attached) + return -EBUSY; -/* transfers a chunk from writer to filled buffer space */ -unsigned comedi_buf_write_free(struct comedi_async *async, unsigned int nbytes) -{ - if ((int)(async->buf_write_count + nbytes - - async->buf_write_alloc_count) > 0) { - printk - (KERN_INFO "comedi: attempted to write-free more bytes than have been write-allocated.\n"); - nbytes = async->buf_write_alloc_count - async->buf_write_count; + mutex_lock(&comedi_drivers_list_lock); + for (driv = comedi_drivers; driv; driv = driv->next) { + if (!try_module_get(driv->module)) + continue; + if (driv->num_names) { + dev->board_ptr = comedi_recognize(driv, it->board_name); + if (dev->board_ptr) + break; + } else if (strcmp(driv->driver_name, it->board_name) == 0) + break; + module_put(driv->module); } - async->buf_write_count += nbytes; - async->buf_write_ptr += nbytes; - comedi_buf_munge(async, async->buf_write_count - async->munge_count); - if (async->buf_write_ptr >= async->prealloc_bufsz) - async->buf_write_ptr %= async->prealloc_bufsz; - - return nbytes; -} -EXPORT_SYMBOL(comedi_buf_write_free); - -/* allocates a chunk for the reader from filled (and munged) buffer space */ -unsigned comedi_buf_read_alloc(struct comedi_async *async, unsigned nbytes) -{ - if ((int)(async->buf_read_alloc_count + nbytes - async->munge_count) > - 0) { - nbytes = async->munge_count - async->buf_read_alloc_count; + if (driv == NULL) { + /* recognize has failed if we get here */ + /* report valid board names before returning error */ + for (driv = comedi_drivers; driv; driv = driv->next) { + if (!try_module_get(driv->module)) + continue; + comedi_report_boards(driv); + module_put(driv->module); + } + ret = -EIO; + goto out; } - async->buf_read_alloc_count += nbytes; - /* barrier insures read of munge_count occurs before we actually read - data out of buffer */ - smp_rmb(); - return nbytes; -} -EXPORT_SYMBOL(comedi_buf_read_alloc); - -/* transfers control of a chunk from reader to free buffer space */ -unsigned comedi_buf_read_free(struct comedi_async *async, unsigned int nbytes) -{ - /* barrier insures data has been read out of - * buffer before read count is incremented */ - smp_mb(); - if ((int)(async->buf_read_count + nbytes - - async->buf_read_alloc_count) > 0) { - printk(KERN_INFO - "comedi: attempted to read-free more bytes than have been read-allocated.\n"); - nbytes = async->buf_read_alloc_count - async->buf_read_count; + if (driv->attach == NULL) { + /* driver does not support manual configuration */ + dev_warn(dev->class_dev, + "driver '%s' does not support attach using comedi_config\n", + driv->driver_name); + module_put(driv->module); + ret = -ENOSYS; + goto out; } - async->buf_read_count += nbytes; - async->buf_read_ptr += nbytes; - async->buf_read_ptr %= async->prealloc_bufsz; - return nbytes; -} -EXPORT_SYMBOL(comedi_buf_read_free); - -void comedi_buf_memcpy_to(struct comedi_async *async, unsigned int offset, - const void *data, unsigned int num_bytes) -{ - unsigned int write_ptr = async->buf_write_ptr + offset; - - if (write_ptr >= async->prealloc_bufsz) - write_ptr %= async->prealloc_bufsz; - - while (num_bytes) { - unsigned int block_size; - - if (write_ptr + num_bytes > async->prealloc_bufsz) - block_size = async->prealloc_bufsz - write_ptr; - else - block_size = num_bytes; - - memcpy(async->prealloc_buf + write_ptr, data, block_size); - - data += block_size; - num_bytes -= block_size; - - write_ptr = 0; + /* initialize dev->driver here so + * comedi_error() can be called from attach */ + dev->driver = driv; + dev->board_name = dev->board_ptr ? *(const char **)dev->board_ptr + : dev->driver->driver_name; + ret = driv->attach(dev, it); + if (ret >= 0) + ret = comedi_device_postconfig(dev); + if (ret < 0) { + comedi_device_detach(dev); + module_put(driv->module); } + /* On success, the driver module count has been incremented. */ +out: + mutex_unlock(&comedi_drivers_list_lock); + return ret; } -EXPORT_SYMBOL(comedi_buf_memcpy_to); -void comedi_buf_memcpy_from(struct comedi_async *async, unsigned int offset, - void *dest, unsigned int nbytes) +int comedi_auto_config(struct device *hardware_device, + struct comedi_driver *driver, unsigned long context) { - void *src; - unsigned int read_ptr = async->buf_read_ptr + offset; - - if (read_ptr >= async->prealloc_bufsz) - read_ptr %= async->prealloc_bufsz; - - while (nbytes) { - unsigned int block_size; - - src = async->prealloc_buf + read_ptr; - - if (nbytes >= async->prealloc_bufsz - read_ptr) - block_size = async->prealloc_bufsz - read_ptr; - else - block_size = nbytes; + struct comedi_device *dev; + int ret; - memcpy(dest, src, block_size); - nbytes -= block_size; - dest += block_size; - read_ptr = 0; + if (!hardware_device) { + pr_warn("BUG! comedi_auto_config called with NULL hardware_device\n"); + return -EINVAL; } -} -EXPORT_SYMBOL(comedi_buf_memcpy_from); - -unsigned int comedi_buf_read_n_available(struct comedi_async *async) -{ - unsigned num_bytes; - - if (async == NULL) - return 0; - num_bytes = async->munge_count - async->buf_read_count; - /* barrier insures the read of munge_count in this - query occurs before any following reads of the buffer which - might be based on the return value from this query. - */ - smp_rmb(); - return num_bytes; -} -EXPORT_SYMBOL(comedi_buf_read_n_available); - -int comedi_buf_get(struct comedi_async *async, short *x) -{ - unsigned int n = comedi_buf_read_n_available(async); - - if (n < sizeof(short)) - return 0; - comedi_buf_read_alloc(async, sizeof(short)); - *x = *(short *)(async->prealloc_buf + async->buf_read_ptr); - comedi_buf_read_free(async, sizeof(short)); - return 1; -} -EXPORT_SYMBOL(comedi_buf_get); - -int comedi_buf_put(struct comedi_async *async, short x) -{ - unsigned int n = comedi_buf_write_alloc_strict(async, sizeof(short)); - - if (n < sizeof(short)) { - async->events |= COMEDI_CB_ERROR; - return 0; + if (!driver) { + dev_warn(hardware_device, + "BUG! comedi_auto_config called with NULL comedi driver\n"); + return -EINVAL; } - *(short *)(async->prealloc_buf + async->buf_write_ptr) = x; - comedi_buf_write_free(async, sizeof(short)); - return 1; -} -EXPORT_SYMBOL(comedi_buf_put); - -void comedi_reset_async_buf(struct comedi_async *async) -{ - async->buf_write_alloc_count = 0; - async->buf_write_count = 0; - async->buf_read_alloc_count = 0; - async->buf_read_count = 0; - async->buf_write_ptr = 0; - async->buf_read_ptr = 0; - - async->cur_chan = 0; - async->scan_progress = 0; - async->munge_chan = 0; - async->munge_count = 0; - async->munge_ptr = 0; - - async->events = 0; -} - -static int comedi_auto_config(struct device *hardware_device, - const char *board_name, const int *options, - unsigned num_options) -{ - struct comedi_devconfig it; - int minor; - struct comedi_device_file_info *dev_file_info; - int retval; - unsigned *private_data = NULL; - - if (!comedi_autoconfig) { - dev_set_drvdata(hardware_device, NULL); - return 0; + if (!driver->auto_attach) { + dev_warn(hardware_device, + "BUG! comedi driver '%s' has no auto_attach handler\n", + driver->driver_name); + return -EINVAL; } - minor = comedi_alloc_board_minor(hardware_device); - if (minor < 0) - return minor; - - private_data = kmalloc(sizeof(unsigned), GFP_KERNEL); - if (private_data == NULL) { - retval = -ENOMEM; - goto cleanup; + dev = comedi_alloc_board_minor(hardware_device); + if (IS_ERR(dev)) { + dev_warn(hardware_device, + "driver '%s' could not create device.\n", + driver->driver_name); + return PTR_ERR(dev); } - *private_data = minor; - dev_set_drvdata(hardware_device, private_data); - - dev_file_info = comedi_get_device_file_info(minor); - - memset(&it, 0, sizeof(it)); - strncpy(it.board_name, board_name, COMEDI_NAMELEN); - it.board_name[COMEDI_NAMELEN - 1] = '\0'; - BUG_ON(num_options > COMEDI_NDEVCONFOPTS); - memcpy(it.options, options, num_options * sizeof(int)); + /* Note: comedi_alloc_board_minor() locked dev->mutex. */ - mutex_lock(&dev_file_info->device->mutex); - retval = comedi_device_attach(dev_file_info->device, &it); - mutex_unlock(&dev_file_info->device->mutex); + dev->driver = driver; + dev->board_name = dev->driver->driver_name; + ret = driver->auto_attach(dev, context); + if (ret >= 0) + ret = comedi_device_postconfig(dev); + mutex_unlock(&dev->mutex); -cleanup: - if (retval < 0) { - kfree(private_data); - comedi_free_board_minor(minor); + if (ret < 0) { + dev_warn(hardware_device, + "driver '%s' failed to auto-configure device.\n", + driver->driver_name); + comedi_release_hardware_device(hardware_device); + } else { + /* + * class_dev should be set properly here + * after a successful auto config + */ + dev_info(dev->class_dev, + "driver '%s' has successfully auto-configured '%s'.\n", + driver->driver_name, dev->board_name); } - return retval; + return ret; } +EXPORT_SYMBOL_GPL(comedi_auto_config); -static void comedi_auto_unconfig(struct device *hardware_device) +void comedi_auto_unconfig(struct device *hardware_device) { - unsigned *minor = (unsigned *)dev_get_drvdata(hardware_device); - if (minor == NULL) + if (hardware_device == NULL) return; - - BUG_ON(*minor >= COMEDI_NUM_BOARD_MINORS); - - comedi_free_board_minor(*minor); - dev_set_drvdata(hardware_device, NULL); - kfree(minor); + comedi_release_hardware_device(hardware_device); } +EXPORT_SYMBOL_GPL(comedi_auto_unconfig); -int comedi_pci_auto_config(struct pci_dev *pcidev, const char *board_name) +int comedi_driver_register(struct comedi_driver *driver) { - int options[2]; - - /* pci bus */ - options[0] = pcidev->bus->number; - /* pci slot */ - options[1] = PCI_SLOT(pcidev->devfn); + mutex_lock(&comedi_drivers_list_lock); + driver->next = comedi_drivers; + comedi_drivers = driver; + mutex_unlock(&comedi_drivers_list_lock); - return comedi_auto_config(&pcidev->dev, board_name, - options, ARRAY_SIZE(options)); + return 0; } -EXPORT_SYMBOL_GPL(comedi_pci_auto_config); +EXPORT_SYMBOL_GPL(comedi_driver_register); -void comedi_pci_auto_unconfig(struct pci_dev *pcidev) +void comedi_driver_unregister(struct comedi_driver *driver) { - comedi_auto_unconfig(&pcidev->dev); -} -EXPORT_SYMBOL_GPL(comedi_pci_auto_unconfig); + struct comedi_driver *prev; + int i; -int comedi_usb_auto_config(struct usb_device *usbdev, const char *board_name) -{ - BUG_ON(usbdev == NULL); - return comedi_auto_config(&usbdev->dev, board_name, NULL, 0); -} -EXPORT_SYMBOL_GPL(comedi_usb_auto_config); + /* unlink the driver */ + mutex_lock(&comedi_drivers_list_lock); + if (comedi_drivers == driver) { + comedi_drivers = driver->next; + } else { + for (prev = comedi_drivers; prev->next; prev = prev->next) { + if (prev->next == driver) { + prev->next = driver->next; + break; + } + } + } + mutex_unlock(&comedi_drivers_list_lock); -void comedi_usb_auto_unconfig(struct usb_device *usbdev) -{ - BUG_ON(usbdev == NULL); - comedi_auto_unconfig(&usbdev->dev); + /* check for devices using this driver */ + for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) { + struct comedi_device *dev = comedi_dev_get_from_minor(i); + + if (!dev) + continue; + + mutex_lock(&dev->mutex); + if (dev->attached && dev->driver == driver) { + if (dev->use_count) + dev_warn(dev->class_dev, + "BUG! detaching device with use_count=%d\n", + dev->use_count); + comedi_device_detach(dev); + } + mutex_unlock(&dev->mutex); + comedi_dev_put(dev); + } } -EXPORT_SYMBOL_GPL(comedi_usb_auto_unconfig); +EXPORT_SYMBOL_GPL(comedi_driver_unregister); |