| /* |
| comedi/comedi_fops.c |
| comedi kernel module |
| |
| COMEDI - Linux Control and Measurement Device Interface |
| Copyright (C) 1997-2000 David A. Schleef <ds@schleef.org> |
| |
| 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., 675 Mass Ave, Cambridge, MA 02139, USA. |
| |
| */ |
| |
| #undef DEBUG |
| |
| #define __NO_VERSION__ |
| #include "comedi_fops.h" |
| #include "comedi_compat32.h" |
| |
| #include <linux/module.h> |
| #include <linux/errno.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> |
| #include <linux/kmod.h> |
| #include <linux/poll.h> |
| #include <linux/init.h> |
| #include <linux/device.h> |
| #include <linux/vmalloc.h> |
| #include <linux/fs.h> |
| #include "comedidev.h" |
| #include <linux/cdev.h> |
| #include <linux/stat.h> |
| |
| #include <linux/io.h> |
| #include <linux/uaccess.h> |
| |
| #include "internal.h" |
| |
| MODULE_AUTHOR("http://www.comedi.org"); |
| MODULE_DESCRIPTION("Comedi core module"); |
| MODULE_LICENSE("GPL"); |
| |
| #ifdef CONFIG_COMEDI_DEBUG |
| int comedi_debug; |
| EXPORT_SYMBOL(comedi_debug); |
| module_param(comedi_debug, int, 0644); |
| #endif |
| |
| int comedi_autoconfig = 1; |
| module_param(comedi_autoconfig, bool, 0444); |
| |
| static int comedi_num_legacy_minors; |
| module_param(comedi_num_legacy_minors, int, 0444); |
| |
| static DEFINE_SPINLOCK(comedi_file_info_table_lock); |
| static struct comedi_device_file_info |
| *comedi_file_info_table[COMEDI_NUM_MINORS]; |
| |
| static int do_devconfig_ioctl(struct comedi_device *dev, |
| struct comedi_devconfig __user *arg); |
| static int do_bufconfig_ioctl(struct comedi_device *dev, |
| struct comedi_bufconfig __user *arg); |
| static int do_devinfo_ioctl(struct comedi_device *dev, |
| struct comedi_devinfo __user *arg, |
| struct file *file); |
| static int do_subdinfo_ioctl(struct comedi_device *dev, |
| struct comedi_subdinfo __user *arg, void *file); |
| static int do_chaninfo_ioctl(struct comedi_device *dev, |
| struct comedi_chaninfo __user *arg); |
| static int do_bufinfo_ioctl(struct comedi_device *dev, |
| struct comedi_bufinfo __user *arg, void *file); |
| static int do_cmd_ioctl(struct comedi_device *dev, |
| struct comedi_cmd __user *arg, void *file); |
| static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg, |
| void *file); |
| static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg, |
| void *file); |
| static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg, |
| void *file); |
| static int do_cmdtest_ioctl(struct comedi_device *dev, |
| struct comedi_cmd __user *arg, void *file); |
| static int do_insnlist_ioctl(struct comedi_device *dev, |
| struct comedi_insnlist __user *arg, void *file); |
| static int do_insn_ioctl(struct comedi_device *dev, |
| struct comedi_insn __user *arg, void *file); |
| static int do_poll_ioctl(struct comedi_device *dev, unsigned int subd, |
| void *file); |
| |
| extern void do_become_nonbusy(struct comedi_device *dev, |
| struct comedi_subdevice *s); |
| static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s); |
| |
| static int comedi_fasync(int fd, struct file *file, int on); |
| |
| static int is_device_busy(struct comedi_device *dev); |
| static int resize_async_buffer(struct comedi_device *dev, |
| struct comedi_subdevice *s, |
| struct comedi_async *async, unsigned new_size); |
| |
| /* declarations for sysfs attribute files */ |
| static struct device_attribute dev_attr_max_read_buffer_kb; |
| static struct device_attribute dev_attr_read_buffer_kb; |
| static struct device_attribute dev_attr_max_write_buffer_kb; |
| static struct device_attribute dev_attr_write_buffer_kb; |
| |
| static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd, |
| unsigned long arg) |
| { |
| const unsigned minor = iminor(file->f_dentry->d_inode); |
| struct comedi_device_file_info *dev_file_info = |
| comedi_get_device_file_info(minor); |
| struct comedi_device *dev; |
| int rc; |
| |
| if (dev_file_info == NULL || dev_file_info->device == NULL) |
| return -ENODEV; |
| dev = dev_file_info->device; |
| |
| mutex_lock(&dev->mutex); |
| |
| /* Device config is special, because it must work on |
| * an unconfigured device. */ |
| if (cmd == COMEDI_DEVCONFIG) { |
| rc = do_devconfig_ioctl(dev, |
| (struct comedi_devconfig __user *)arg); |
| goto done; |
| } |
| |
| if (!dev->attached) { |
| DPRINTK("no driver configured on /dev/comedi%i\n", dev->minor); |
| rc = -ENODEV; |
| goto done; |
| } |
| |
| switch (cmd) { |
| case COMEDI_BUFCONFIG: |
| rc = do_bufconfig_ioctl(dev, |
| (struct comedi_bufconfig __user *)arg); |
| break; |
| case COMEDI_DEVINFO: |
| rc = do_devinfo_ioctl(dev, (struct comedi_devinfo __user *)arg, |
| file); |
| break; |
| case COMEDI_SUBDINFO: |
| rc = do_subdinfo_ioctl(dev, |
| (struct comedi_subdinfo __user *)arg, |
| file); |
| break; |
| case COMEDI_CHANINFO: |
| rc = do_chaninfo_ioctl(dev, (void __user *)arg); |
| break; |
| case COMEDI_RANGEINFO: |
| rc = do_rangeinfo_ioctl(dev, (void __user *)arg); |
| break; |
| case COMEDI_BUFINFO: |
| rc = do_bufinfo_ioctl(dev, |
| (struct comedi_bufinfo __user *)arg, |
| file); |
| break; |
| case COMEDI_LOCK: |
| rc = do_lock_ioctl(dev, arg, file); |
| break; |
| case COMEDI_UNLOCK: |
| rc = do_unlock_ioctl(dev, arg, file); |
| break; |
| case COMEDI_CANCEL: |
| rc = do_cancel_ioctl(dev, arg, file); |
| break; |
| case COMEDI_CMD: |
| rc = do_cmd_ioctl(dev, (struct comedi_cmd __user *)arg, file); |
| break; |
| case COMEDI_CMDTEST: |
| rc = do_cmdtest_ioctl(dev, (struct comedi_cmd __user *)arg, |
| file); |
| break; |
| case COMEDI_INSNLIST: |
| rc = do_insnlist_ioctl(dev, |
| (struct comedi_insnlist __user *)arg, |
| file); |
| break; |
| case COMEDI_INSN: |
| rc = do_insn_ioctl(dev, (struct comedi_insn __user *)arg, |
| file); |
| break; |
| case COMEDI_POLL: |
| rc = do_poll_ioctl(dev, arg, file); |
| break; |
| default: |
| rc = -ENOTTY; |
| break; |
| } |
| |
| done: |
| mutex_unlock(&dev->mutex); |
| return rc; |
| } |
| |
| /* |
| COMEDI_DEVCONFIG |
| device config ioctl |
| |
| arg: |
| pointer to devconfig structure |
| |
| reads: |
| devconfig structure at arg |
| |
| writes: |
| none |
| */ |
| static int do_devconfig_ioctl(struct comedi_device *dev, |
| struct comedi_devconfig __user *arg) |
| { |
| struct comedi_devconfig it; |
| int ret; |
| unsigned char *aux_data = NULL; |
| int aux_len; |
| |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EPERM; |
| |
| if (arg == NULL) { |
| if (is_device_busy(dev)) |
| return -EBUSY; |
| if (dev->attached) { |
| struct module *driver_module = dev->driver->module; |
| comedi_device_detach(dev); |
| module_put(driver_module); |
| } |
| return 0; |
| } |
| |
| if (copy_from_user(&it, arg, sizeof(struct comedi_devconfig))) |
| return -EFAULT; |
| |
| it.board_name[COMEDI_NAMELEN - 1] = 0; |
| |
| if (comedi_aux_data(it.options, 0) && |
| it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) { |
| int bit_shift; |
| aux_len = it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]; |
| if (aux_len < 0) |
| return -EFAULT; |
| |
| aux_data = vmalloc(aux_len); |
| if (!aux_data) |
| return -ENOMEM; |
| |
| if (copy_from_user(aux_data, |
| comedi_aux_data(it.options, 0), aux_len)) { |
| vfree(aux_data); |
| return -EFAULT; |
| } |
| it.options[COMEDI_DEVCONF_AUX_DATA_LO] = |
| (unsigned long)aux_data; |
| if (sizeof(void *) > sizeof(int)) { |
| bit_shift = sizeof(int) * 8; |
| it.options[COMEDI_DEVCONF_AUX_DATA_HI] = |
| ((unsigned long)aux_data) >> bit_shift; |
| } else |
| it.options[COMEDI_DEVCONF_AUX_DATA_HI] = 0; |
| } |
| |
| ret = comedi_device_attach(dev, &it); |
| if (ret == 0) { |
| if (!try_module_get(dev->driver->module)) { |
| comedi_device_detach(dev); |
| return -ENOSYS; |
| } |
| } |
| |
| if (aux_data) |
| vfree(aux_data); |
| |
| return ret; |
| } |
| |
| /* |
| COMEDI_BUFCONFIG |
| buffer configuration ioctl |
| |
| arg: |
| pointer to bufconfig structure |
| |
| reads: |
| bufconfig at arg |
| |
| writes: |
| modified bufconfig at arg |
| |
| */ |
| static int do_bufconfig_ioctl(struct comedi_device *dev, |
| struct comedi_bufconfig __user *arg) |
| { |
| struct comedi_bufconfig bc; |
| struct comedi_async *async; |
| struct comedi_subdevice *s; |
| int retval = 0; |
| |
| if (copy_from_user(&bc, arg, sizeof(struct comedi_bufconfig))) |
| return -EFAULT; |
| |
| if (bc.subdevice >= dev->n_subdevices || bc.subdevice < 0) |
| return -EINVAL; |
| |
| s = dev->subdevices + bc.subdevice; |
| async = s->async; |
| |
| if (!async) { |
| DPRINTK("subdevice does not have async capability\n"); |
| bc.size = 0; |
| bc.maximum_size = 0; |
| goto copyback; |
| } |
| |
| if (bc.maximum_size) { |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EPERM; |
| |
| async->max_bufsize = bc.maximum_size; |
| } |
| |
| if (bc.size) { |
| retval = resize_async_buffer(dev, s, async, bc.size); |
| if (retval < 0) |
| return retval; |
| } |
| |
| bc.size = async->prealloc_bufsz; |
| bc.maximum_size = async->max_bufsize; |
| |
| copyback: |
| if (copy_to_user(arg, &bc, sizeof(struct comedi_bufconfig))) |
| return -EFAULT; |
| |
| return 0; |
| } |
| |
| /* |
| COMEDI_DEVINFO |
| device info ioctl |
| |
| arg: |
| pointer to devinfo structure |
| |
| reads: |
| none |
| |
| writes: |
| devinfo structure |
| |
| */ |
| static int do_devinfo_ioctl(struct comedi_device *dev, |
| struct comedi_devinfo __user *arg, |
| struct file *file) |
| { |
| struct comedi_devinfo devinfo; |
| const unsigned minor = iminor(file->f_dentry->d_inode); |
| struct comedi_device_file_info *dev_file_info = |
| comedi_get_device_file_info(minor); |
| struct comedi_subdevice *read_subdev = |
| comedi_get_read_subdevice(dev_file_info); |
| struct comedi_subdevice *write_subdev = |
| comedi_get_write_subdevice(dev_file_info); |
| |
| memset(&devinfo, 0, sizeof(devinfo)); |
| |
| /* fill devinfo structure */ |
| devinfo.version_code = COMEDI_VERSION_CODE; |
| devinfo.n_subdevs = dev->n_subdevices; |
| memcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN); |
| memcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN); |
| |
| if (read_subdev) |
| devinfo.read_subdevice = read_subdev - dev->subdevices; |
| else |
| devinfo.read_subdevice = -1; |
| |
| if (write_subdev) |
| devinfo.write_subdevice = write_subdev - dev->subdevices; |
| else |
| devinfo.write_subdevice = -1; |
| |
| if (copy_to_user(arg, &devinfo, sizeof(struct comedi_devinfo))) |
| return -EFAULT; |
| |
| return 0; |
| } |
| |
| /* |
| COMEDI_SUBDINFO |
| subdevice info ioctl |
| |
| arg: |
| pointer to array of subdevice info structures |
| |
| reads: |
| none |
| |
| writes: |
| array of subdevice info structures at arg |
| |
| */ |
| static int do_subdinfo_ioctl(struct comedi_device *dev, |
| struct comedi_subdinfo __user *arg, void *file) |
| { |
| int ret, i; |
| struct comedi_subdinfo *tmp, *us; |
| struct comedi_subdevice *s; |
| |
| tmp = |
| kcalloc(dev->n_subdevices, sizeof(struct comedi_subdinfo), |
| GFP_KERNEL); |
| if (!tmp) |
| return -ENOMEM; |
| |
| /* fill subdinfo structs */ |
| for (i = 0; i < dev->n_subdevices; i++) { |
| s = dev->subdevices + i; |
| us = tmp + i; |
| |
| us->type = s->type; |
| us->n_chan = s->n_chan; |
| us->subd_flags = s->subdev_flags; |
| if (comedi_get_subdevice_runflags(s) & SRF_RUNNING) |
| us->subd_flags |= SDF_RUNNING; |
| #define TIMER_nanosec 5 /* backwards compatibility */ |
| us->timer_type = TIMER_nanosec; |
| us->len_chanlist = s->len_chanlist; |
| us->maxdata = s->maxdata; |
| if (s->range_table) { |
| us->range_type = |
| (i << 24) | (0 << 16) | (s->range_table->length); |
| } else { |
| us->range_type = 0; /* XXX */ |
| } |
| us->flags = s->flags; |
| |
| if (s->busy) |
| us->subd_flags |= SDF_BUSY; |
| if (s->busy == file) |
| us->subd_flags |= SDF_BUSY_OWNER; |
| if (s->lock) |
| us->subd_flags |= SDF_LOCKED; |
| if (s->lock == file) |
| us->subd_flags |= SDF_LOCK_OWNER; |
| if (!s->maxdata && s->maxdata_list) |
| us->subd_flags |= SDF_MAXDATA; |
| if (s->flaglist) |
| us->subd_flags |= SDF_FLAGS; |
| if (s->range_table_list) |
| us->subd_flags |= SDF_RANGETYPE; |
| if (s->do_cmd) |
| us->subd_flags |= SDF_CMD; |
| |
| if (s->insn_bits != &insn_inval) |
| us->insn_bits_support = COMEDI_SUPPORTED; |
| else |
| us->insn_bits_support = COMEDI_UNSUPPORTED; |
| |
| us->settling_time_0 = s->settling_time_0; |
| } |
| |
| ret = copy_to_user(arg, tmp, |
| dev->n_subdevices * sizeof(struct comedi_subdinfo)); |
| |
| kfree(tmp); |
| |
| return ret ? -EFAULT : 0; |
| } |
| |
| /* |
| COMEDI_CHANINFO |
| subdevice info ioctl |
| |
| arg: |
| pointer to chaninfo structure |
| |
| reads: |
| chaninfo structure at arg |
| |
| writes: |
| arrays at elements of chaninfo structure |
| |
| */ |
| static int do_chaninfo_ioctl(struct comedi_device *dev, |
| struct comedi_chaninfo __user *arg) |
| { |
| struct comedi_subdevice *s; |
| struct comedi_chaninfo it; |
| |
| if (copy_from_user(&it, arg, sizeof(struct comedi_chaninfo))) |
| return -EFAULT; |
| |
| if (it.subdev >= dev->n_subdevices) |
| return -EINVAL; |
| s = dev->subdevices + it.subdev; |
| |
| if (it.maxdata_list) { |
| if (s->maxdata || !s->maxdata_list) |
| return -EINVAL; |
| if (copy_to_user(it.maxdata_list, s->maxdata_list, |
| s->n_chan * sizeof(unsigned int))) |
| return -EFAULT; |
| } |
| |
| if (it.flaglist) { |
| if (!s->flaglist) |
| return -EINVAL; |
| if (copy_to_user(it.flaglist, s->flaglist, |
| s->n_chan * sizeof(unsigned int))) |
| return -EFAULT; |
| } |
| |
| if (it.rangelist) { |
| int i; |
| |
| if (!s->range_table_list) |
| return -EINVAL; |
| for (i = 0; i < s->n_chan; i++) { |
| int x; |
| |
| x = (dev->minor << 28) | (it.subdev << 24) | (i << 16) | |
| (s->range_table_list[i]->length); |
| if (put_user(x, it.rangelist + i)) |
| return -EFAULT; |
| } |
| #if 0 |
| if (copy_to_user(it.rangelist, s->range_type_list, |
| s->n_chan * sizeof(unsigned int))) |
| return -EFAULT; |
| #endif |
| } |
| |
| return 0; |
| } |
| |
| /* |
| COMEDI_BUFINFO |
| buffer information ioctl |
| |
| arg: |
| pointer to bufinfo structure |
| |
| reads: |
| bufinfo at arg |
| |
| writes: |
| modified bufinfo at arg |
| |
| */ |
| static int do_bufinfo_ioctl(struct comedi_device *dev, |
| struct comedi_bufinfo __user *arg, void *file) |
| { |
| struct comedi_bufinfo bi; |
| struct comedi_subdevice *s; |
| struct comedi_async *async; |
| |
| if (copy_from_user(&bi, arg, sizeof(struct comedi_bufinfo))) |
| return -EFAULT; |
| |
| if (bi.subdevice >= dev->n_subdevices || bi.subdevice < 0) |
| return -EINVAL; |
| |
| s = dev->subdevices + bi.subdevice; |
| |
| if (s->lock && s->lock != file) |
| return -EACCES; |
| |
| async = s->async; |
| |
| if (!async) { |
| DPRINTK("subdevice does not have async capability\n"); |
| bi.buf_write_ptr = 0; |
| bi.buf_read_ptr = 0; |
| bi.buf_write_count = 0; |
| bi.buf_read_count = 0; |
| bi.bytes_read = 0; |
| bi.bytes_written = 0; |
| goto copyback; |
| } |
| if (!s->busy) { |
| bi.bytes_read = 0; |
| bi.bytes_written = 0; |
| goto copyback_position; |
| } |
| if (s->busy != file) |
| return -EACCES; |
| |
| if (bi.bytes_read && (s->subdev_flags & SDF_CMD_READ)) { |
| bi.bytes_read = comedi_buf_read_alloc(async, bi.bytes_read); |
| comedi_buf_read_free(async, bi.bytes_read); |
| |
| if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR | |
| SRF_RUNNING)) |
| && async->buf_write_count == async->buf_read_count) { |
| do_become_nonbusy(dev, s); |
| } |
| } |
| |
| if (bi.bytes_written && (s->subdev_flags & SDF_CMD_WRITE)) { |
| bi.bytes_written = |
| comedi_buf_write_alloc(async, bi.bytes_written); |
| comedi_buf_write_free(async, bi.bytes_written); |
| } |
| |
| copyback_position: |
| bi.buf_write_count = async->buf_write_count; |
| bi.buf_write_ptr = async->buf_write_ptr; |
| bi.buf_read_count = async->buf_read_count; |
| bi.buf_read_ptr = async->buf_read_ptr; |
| |
| copyback: |
| if (copy_to_user(arg, &bi, sizeof(struct comedi_bufinfo))) |
| return -EFAULT; |
| |
| return 0; |
| } |
| |
| static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn, |
| unsigned int *data, void *file); |
| /* |
| * COMEDI_INSNLIST |
| * synchronous instructions |
| * |
| * arg: |
| * pointer to sync cmd structure |
| * |
| * reads: |
| * sync cmd struct at arg |
| * instruction list |
| * data (for writes) |
| * |
| * writes: |
| * data (for reads) |
| */ |
| /* arbitrary limits */ |
| #define MAX_SAMPLES 256 |
| static int do_insnlist_ioctl(struct comedi_device *dev, |
| struct comedi_insnlist __user *arg, void *file) |
| { |
| struct comedi_insnlist insnlist; |
| struct comedi_insn *insns = NULL; |
| unsigned int *data = NULL; |
| int i = 0; |
| int ret = 0; |
| |
| if (copy_from_user(&insnlist, arg, sizeof(struct comedi_insnlist))) |
| return -EFAULT; |
| |
| data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL); |
| if (!data) { |
| DPRINTK("kmalloc failed\n"); |
| ret = -ENOMEM; |
| goto error; |
| } |
| |
| insns = |
| kmalloc(sizeof(struct comedi_insn) * insnlist.n_insns, GFP_KERNEL); |
| if (!insns) { |
| DPRINTK("kmalloc failed\n"); |
| ret = -ENOMEM; |
| goto error; |
| } |
| |
| if (copy_from_user(insns, insnlist.insns, |
| sizeof(struct comedi_insn) * insnlist.n_insns)) { |
| DPRINTK("copy_from_user failed\n"); |
| ret = -EFAULT; |
| goto error; |
| } |
| |
| for (i = 0; i < insnlist.n_insns; i++) { |
| if (insns[i].n > MAX_SAMPLES) { |
| DPRINTK("number of samples too large\n"); |
| ret = -EINVAL; |
| goto error; |
| } |
| if (insns[i].insn & INSN_MASK_WRITE) { |
| if (copy_from_user(data, insns[i].data, |
| insns[i].n * sizeof(unsigned int))) { |
| DPRINTK("copy_from_user failed\n"); |
| ret = -EFAULT; |
| goto error; |
| } |
| } |
| ret = parse_insn(dev, insns + i, data, file); |
| if (ret < 0) |
| goto error; |
| if (insns[i].insn & INSN_MASK_READ) { |
| if (copy_to_user(insns[i].data, data, |
| insns[i].n * sizeof(unsigned int))) { |
| DPRINTK("copy_to_user failed\n"); |
| ret = -EFAULT; |
| goto error; |
| } |
| } |
| if (need_resched()) |
| schedule(); |
| } |
| |
| error: |
| kfree(insns); |
| kfree(data); |
| |
| if (ret < 0) |
| return ret; |
| return i; |
| } |
| |
| static int check_insn_config_length(struct comedi_insn *insn, |
| unsigned int *data) |
| { |
| if (insn->n < 1) |
| return -EINVAL; |
| |
| switch (data[0]) { |
| case INSN_CONFIG_DIO_OUTPUT: |
| case INSN_CONFIG_DIO_INPUT: |
| case INSN_CONFIG_DISARM: |
| case INSN_CONFIG_RESET: |
| if (insn->n == 1) |
| return 0; |
| break; |
| case INSN_CONFIG_ARM: |
| case INSN_CONFIG_DIO_QUERY: |
| case INSN_CONFIG_BLOCK_SIZE: |
| case INSN_CONFIG_FILTER: |
| case INSN_CONFIG_SERIAL_CLOCK: |
| case INSN_CONFIG_BIDIRECTIONAL_DATA: |
| case INSN_CONFIG_ALT_SOURCE: |
| case INSN_CONFIG_SET_COUNTER_MODE: |
| case INSN_CONFIG_8254_READ_STATUS: |
| case INSN_CONFIG_SET_ROUTING: |
| case INSN_CONFIG_GET_ROUTING: |
| case INSN_CONFIG_GET_PWM_STATUS: |
| case INSN_CONFIG_PWM_SET_PERIOD: |
| case INSN_CONFIG_PWM_GET_PERIOD: |
| if (insn->n == 2) |
| return 0; |
| break; |
| case INSN_CONFIG_SET_GATE_SRC: |
| case INSN_CONFIG_GET_GATE_SRC: |
| case INSN_CONFIG_SET_CLOCK_SRC: |
| case INSN_CONFIG_GET_CLOCK_SRC: |
| case INSN_CONFIG_SET_OTHER_SRC: |
| case INSN_CONFIG_GET_COUNTER_STATUS: |
| case INSN_CONFIG_PWM_SET_H_BRIDGE: |
| case INSN_CONFIG_PWM_GET_H_BRIDGE: |
| case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE: |
| if (insn->n == 3) |
| return 0; |
| break; |
| case INSN_CONFIG_PWM_OUTPUT: |
| case INSN_CONFIG_ANALOG_TRIG: |
| if (insn->n == 5) |
| return 0; |
| break; |
| /* by default we allow the insn since we don't have checks for |
| * all possible cases yet */ |
| default: |
| printk(KERN_WARNING |
| "comedi: no check for data length of config insn id " |
| "%i is implemented.\n" |
| " Add a check to %s in %s.\n" |
| " Assuming n=%i is correct.\n", data[0], __func__, |
| __FILE__, insn->n); |
| return 0; |
| break; |
| } |
| return -EINVAL; |
| } |
| |
| static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn, |
| unsigned int *data, void *file) |
| { |
| struct comedi_subdevice *s; |
| int ret = 0; |
| int i; |
| |
| if (insn->insn & INSN_MASK_SPECIAL) { |
| /* a non-subdevice instruction */ |
| |
| switch (insn->insn) { |
| case INSN_GTOD: |
| { |
| struct timeval tv; |
| |
| if (insn->n != 2) { |
| ret = -EINVAL; |
| break; |
| } |
| |
| do_gettimeofday(&tv); |
| data[0] = tv.tv_sec; |
| data[1] = tv.tv_usec; |
| ret = 2; |
| |
| break; |
| } |
| case INSN_WAIT: |
| if (insn->n != 1 || data[0] >= 100000) { |
| ret = -EINVAL; |
| break; |
| } |
| udelay(data[0] / 1000); |
| ret = 1; |
| break; |
| case INSN_INTTRIG: |
| if (insn->n != 1) { |
| ret = -EINVAL; |
| break; |
| } |
| if (insn->subdev >= dev->n_subdevices) { |
| DPRINTK("%d not usable subdevice\n", |
| insn->subdev); |
| ret = -EINVAL; |
| break; |
| } |
| s = dev->subdevices + insn->subdev; |
| if (!s->async) { |
| DPRINTK("no async\n"); |
| ret = -EINVAL; |
| break; |
| } |
| if (!s->async->inttrig) { |
| DPRINTK("no inttrig\n"); |
| ret = -EAGAIN; |
| break; |
| } |
| ret = s->async->inttrig(dev, s, insn->data[0]); |
| if (ret >= 0) |
| ret = 1; |
| break; |
| default: |
| DPRINTK("invalid insn\n"); |
| ret = -EINVAL; |
| break; |
| } |
| } else { |
| /* a subdevice instruction */ |
| unsigned int maxdata; |
| |
| if (insn->subdev >= dev->n_subdevices) { |
| DPRINTK("subdevice %d out of range\n", insn->subdev); |
| ret = -EINVAL; |
| goto out; |
| } |
| s = dev->subdevices + insn->subdev; |
| |
| if (s->type == COMEDI_SUBD_UNUSED) { |
| DPRINTK("%d not usable subdevice\n", insn->subdev); |
| ret = -EIO; |
| goto out; |
| } |
| |
| /* are we locked? (ioctl lock) */ |
| if (s->lock && s->lock != file) { |
| DPRINTK("device locked\n"); |
| ret = -EACCES; |
| goto out; |
| } |
| |
| ret = comedi_check_chanlist(s, 1, &insn->chanspec); |
| if (ret < 0) { |
| ret = -EINVAL; |
| DPRINTK("bad chanspec\n"); |
| goto out; |
| } |
| |
| if (s->busy) { |
| ret = -EBUSY; |
| goto out; |
| } |
| /* This looks arbitrary. It is. */ |
| s->busy = &parse_insn; |
| switch (insn->insn) { |
| case INSN_READ: |
| ret = s->insn_read(dev, s, insn, data); |
| break; |
| case INSN_WRITE: |
| maxdata = s->maxdata_list |
| ? s->maxdata_list[CR_CHAN(insn->chanspec)] |
| : s->maxdata; |
| for (i = 0; i < insn->n; ++i) { |
| if (data[i] > maxdata) { |
| ret = -EINVAL; |
| DPRINTK("bad data value(s)\n"); |
| break; |
| } |
| } |
| if (ret == 0) |
| ret = s->insn_write(dev, s, insn, data); |
| break; |
| case INSN_BITS: |
| if (insn->n != 2) { |
| ret = -EINVAL; |
| break; |
| } |
| ret = s->insn_bits(dev, s, insn, data); |
| break; |
| case INSN_CONFIG: |
| ret = check_insn_config_length(insn, data); |
| if (ret) |
| break; |
| ret = s->insn_config(dev, s, insn, data); |
| break; |
| default: |
| ret = -EINVAL; |
| break; |
| } |
| |
| s->busy = NULL; |
| } |
| |
| out: |
| return ret; |
| } |
| |
| /* |
| * COMEDI_INSN |
| * synchronous instructions |
| * |
| * arg: |
| * pointer to insn |
| * |
| * reads: |
| * struct comedi_insn struct at arg |
| * data (for writes) |
| * |
| * writes: |
| * data (for reads) |
| */ |
| static int do_insn_ioctl(struct comedi_device *dev, |
| struct comedi_insn __user *arg, void *file) |
| { |
| struct comedi_insn insn; |
| unsigned int *data = NULL; |
| int ret = 0; |
| |
| data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL); |
| if (!data) { |
| ret = -ENOMEM; |
| goto error; |
| } |
| |
| if (copy_from_user(&insn, arg, sizeof(struct comedi_insn))) { |
| ret = -EFAULT; |
| goto error; |
| } |
| |
| /* This is where the behavior of insn and insnlist deviate. */ |
| if (insn.n > MAX_SAMPLES) |
| insn.n = MAX_SAMPLES; |
| if (insn.insn & INSN_MASK_WRITE) { |
| if (copy_from_user(data, |
| insn.data, |
| insn.n * sizeof(unsigned int))) { |
| ret = -EFAULT; |
| goto error; |
| } |
| } |
| ret = parse_insn(dev, &insn, data, file); |
| if (ret < 0) |
| goto error; |
| if (insn.insn & INSN_MASK_READ) { |
| if (copy_to_user(insn.data, |
| data, |
| insn.n * sizeof(unsigned int))) { |
| ret = -EFAULT; |
| goto error; |
| } |
| } |
| ret = insn.n; |
| |
| error: |
| kfree(data); |
| |
| return ret; |
| } |
| |
| static void comedi_set_subdevice_runflags(struct comedi_subdevice *s, |
| unsigned mask, unsigned bits) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&s->spin_lock, flags); |
| s->runflags &= ~mask; |
| s->runflags |= (bits & mask); |
| spin_unlock_irqrestore(&s->spin_lock, flags); |
| } |
| |
| static int do_cmd_ioctl(struct comedi_device *dev, |
| struct comedi_cmd __user *cmd, void *file) |
| { |
| struct comedi_cmd user_cmd; |
| struct comedi_subdevice *s; |
| struct comedi_async *async; |
| int ret = 0; |
| unsigned int __user *chanlist_saver = NULL; |
| |
| if (copy_from_user(&user_cmd, cmd, sizeof(struct comedi_cmd))) { |
| DPRINTK("bad cmd address\n"); |
| return -EFAULT; |
| } |
| /* save user's chanlist pointer so it can be restored later */ |
| chanlist_saver = user_cmd.chanlist; |
| |
| if (user_cmd.subdev >= dev->n_subdevices) { |
| DPRINTK("%d no such subdevice\n", user_cmd.subdev); |
| return -ENODEV; |
| } |
| |
| s = dev->subdevices + user_cmd.subdev; |
| async = s->async; |
| |
| if (s->type == COMEDI_SUBD_UNUSED) { |
| DPRINTK("%d not valid subdevice\n", user_cmd.subdev); |
| return -EIO; |
| } |
| |
| if (!s->do_cmd || !s->do_cmdtest || !s->async) { |
| DPRINTK("subdevice %i does not support commands\n", |
| user_cmd.subdev); |
| return -EIO; |
| } |
| |
| /* are we locked? (ioctl lock) */ |
| if (s->lock && s->lock != file) { |
| DPRINTK("subdevice locked\n"); |
| return -EACCES; |
| } |
| |
| /* are we busy? */ |
| if (s->busy) { |
| DPRINTK("subdevice busy\n"); |
| return -EBUSY; |
| } |
| s->busy = file; |
| |
| /* make sure channel/gain list isn't too long */ |
| if (user_cmd.chanlist_len > s->len_chanlist) { |
| DPRINTK("channel/gain list too long %u > %d\n", |
| user_cmd.chanlist_len, s->len_chanlist); |
| ret = -EINVAL; |
| goto cleanup; |
| } |
| |
| /* make sure channel/gain list isn't too short */ |
| if (user_cmd.chanlist_len < 1) { |
| DPRINTK("channel/gain list too short %u < 1\n", |
| user_cmd.chanlist_len); |
| ret = -EINVAL; |
| goto cleanup; |
| } |
| |
| kfree(async->cmd.chanlist); |
| async->cmd = user_cmd; |
| async->cmd.data = NULL; |
| /* load channel/gain list */ |
| async->cmd.chanlist = |
| kmalloc(async->cmd.chanlist_len * sizeof(int), GFP_KERNEL); |
| if (!async->cmd.chanlist) { |
| DPRINTK("allocation failed\n"); |
| ret = -ENOMEM; |
| goto cleanup; |
| } |
| |
| if (copy_from_user(async->cmd.chanlist, user_cmd.chanlist, |
| async->cmd.chanlist_len * sizeof(int))) { |
| DPRINTK("fault reading chanlist\n"); |
| ret = -EFAULT; |
| goto cleanup; |
| } |
| |
| /* make sure each element in channel/gain list is valid */ |
| ret = comedi_check_chanlist(s, |
| async->cmd.chanlist_len, |
| async->cmd.chanlist); |
| if (ret < 0) { |
| DPRINTK("bad chanlist\n"); |
| goto cleanup; |
| } |
| |
| ret = s->do_cmdtest(dev, s, &async->cmd); |
| |
| if (async->cmd.flags & TRIG_BOGUS || ret) { |
| DPRINTK("test returned %d\n", ret); |
| user_cmd = async->cmd; |
| /* restore chanlist pointer before copying back */ |
| user_cmd.chanlist = chanlist_saver; |
| user_cmd.data = NULL; |
| if (copy_to_user(cmd, &user_cmd, sizeof(struct comedi_cmd))) { |
| DPRINTK("fault writing cmd\n"); |
| ret = -EFAULT; |
| goto cleanup; |
| } |
| ret = -EAGAIN; |
| goto cleanup; |
| } |
| |
| if (!async->prealloc_bufsz) { |
| ret = -ENOMEM; |
| DPRINTK("no buffer (?)\n"); |
| goto cleanup; |
| } |
| |
| comedi_reset_async_buf(async); |
| |
| async->cb_mask = |
| COMEDI_CB_EOA | COMEDI_CB_BLOCK | COMEDI_CB_ERROR | |
| COMEDI_CB_OVERFLOW; |
| if (async->cmd.flags & TRIG_WAKE_EOS) |
| async->cb_mask |= COMEDI_CB_EOS; |
| |
| comedi_set_subdevice_runflags(s, ~0, SRF_USER | SRF_RUNNING); |
| |
| ret = s->do_cmd(dev, s); |
| if (ret == 0) |
| return 0; |
| |
| cleanup: |
| do_become_nonbusy(dev, s); |
| |
| return ret; |
| } |
| |
| /* |
| COMEDI_CMDTEST |
| command testing ioctl |
| |
| arg: |
| pointer to cmd structure |
| |
| reads: |
| cmd structure at arg |
| channel/range list |
| |
| writes: |
| modified cmd structure at arg |
| |
| */ |
| static int do_cmdtest_ioctl(struct comedi_device *dev, |
| struct comedi_cmd __user *arg, void *file) |
| { |
| struct comedi_cmd user_cmd; |
| struct comedi_subdevice *s; |
| int ret = 0; |
| unsigned int *chanlist = NULL; |
| unsigned int __user *chanlist_saver = NULL; |
| |
| if (copy_from_user(&user_cmd, arg, sizeof(struct comedi_cmd))) { |
| DPRINTK("bad cmd address\n"); |
| return -EFAULT; |
| } |
| /* save user's chanlist pointer so it can be restored later */ |
| chanlist_saver = user_cmd.chanlist; |
| |
| if (user_cmd.subdev >= dev->n_subdevices) { |
| DPRINTK("%d no such subdevice\n", user_cmd.subdev); |
| return -ENODEV; |
| } |
| |
| s = dev->subdevices + user_cmd.subdev; |
| if (s->type == COMEDI_SUBD_UNUSED) { |
| DPRINTK("%d not valid subdevice\n", user_cmd.subdev); |
| return -EIO; |
| } |
| |
| if (!s->do_cmd || !s->do_cmdtest) { |
| DPRINTK("subdevice %i does not support commands\n", |
| user_cmd.subdev); |
| return -EIO; |
| } |
| |
| /* make sure channel/gain list isn't too long */ |
| if (user_cmd.chanlist_len > s->len_chanlist) { |
| DPRINTK("channel/gain list too long %d > %d\n", |
| user_cmd.chanlist_len, s->len_chanlist); |
| ret = -EINVAL; |
| goto cleanup; |
| } |
| |
| /* load channel/gain list */ |
| if (user_cmd.chanlist) { |
| chanlist = |
| kmalloc(user_cmd.chanlist_len * sizeof(int), GFP_KERNEL); |
| if (!chanlist) { |
| DPRINTK("allocation failed\n"); |
| ret = -ENOMEM; |
| goto cleanup; |
| } |
| |
| if (copy_from_user(chanlist, user_cmd.chanlist, |
| user_cmd.chanlist_len * sizeof(int))) { |
| DPRINTK("fault reading chanlist\n"); |
| ret = -EFAULT; |
| goto cleanup; |
| } |
| |
| /* make sure each element in channel/gain list is valid */ |
| ret = comedi_check_chanlist(s, user_cmd.chanlist_len, chanlist); |
| if (ret < 0) { |
| DPRINTK("bad chanlist\n"); |
| goto cleanup; |
| } |
| |
| user_cmd.chanlist = chanlist; |
| } |
| |
| ret = s->do_cmdtest(dev, s, &user_cmd); |
| |
| /* restore chanlist pointer before copying back */ |
| user_cmd.chanlist = chanlist_saver; |
| |
| if (copy_to_user(arg, &user_cmd, sizeof(struct comedi_cmd))) { |
| DPRINTK("bad cmd address\n"); |
| ret = -EFAULT; |
| goto cleanup; |
| } |
| cleanup: |
| kfree(chanlist); |
| |
| return ret; |
| } |
| |
| /* |
| COMEDI_LOCK |
| lock subdevice |
| |
| arg: |
| subdevice number |
| |
| reads: |
| none |
| |
| writes: |
| none |
| |
| */ |
| |
| static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg, |
| void *file) |
| { |
| int ret = 0; |
| unsigned long flags; |
| struct comedi_subdevice *s; |
| |
| if (arg >= dev->n_subdevices) |
| return -EINVAL; |
| s = dev->subdevices + arg; |
| |
| spin_lock_irqsave(&s->spin_lock, flags); |
| if (s->busy || s->lock) |
| ret = -EBUSY; |
| else |
| s->lock = file; |
| spin_unlock_irqrestore(&s->spin_lock, flags); |
| |
| if (ret < 0) |
| return ret; |
| |
| #if 0 |
| if (s->lock_f) |
| ret = s->lock_f(dev, s); |
| #endif |
| |
| return ret; |
| } |
| |
| /* |
| COMEDI_UNLOCK |
| unlock subdevice |
| |
| arg: |
| subdevice number |
| |
| reads: |
| none |
| |
| writes: |
| none |
| |
| This function isn't protected by the semaphore, since |
| we already own the lock. |
| */ |
| static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg, |
| void *file) |
| { |
| struct comedi_subdevice *s; |
| |
| if (arg >= dev->n_subdevices) |
| return -EINVAL; |
| s = dev->subdevices + arg; |
| |
| if (s->busy) |
| return -EBUSY; |
| |
| if (s->lock && s->lock != file) |
| return -EACCES; |
| |
| if (s->lock == file) { |
| #if 0 |
| if (s->unlock) |
| s->unlock(dev, s); |
| #endif |
| |
| s->lock = NULL; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| COMEDI_CANCEL |
| cancel acquisition ioctl |
| |
| arg: |
| subdevice number |
| |
| reads: |
| nothing |
| |
| writes: |
| nothing |
| |
| */ |
| static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg, |
| void *file) |
| { |
| struct comedi_subdevice *s; |
| |
| if (arg >= dev->n_subdevices) |
| return -EINVAL; |
| s = dev->subdevices + arg; |
| if (s->async == NULL) |
| return -EINVAL; |
| |
| if (s->lock && s->lock != file) |
| return -EACCES; |
| |
| if (!s->busy) |
| return 0; |
| |
| if (s->busy != file) |
| return -EBUSY; |
| |
| return do_cancel(dev, s); |
| } |
| |
| /* |
| COMEDI_POLL ioctl |
| instructs driver to synchronize buffers |
| |
| arg: |
| subdevice number |
| |
| reads: |
| nothing |
| |
| writes: |
| nothing |
| |
| */ |
| static int do_poll_ioctl(struct comedi_device *dev, unsigned int arg, |
| void *file) |
| { |
| struct comedi_subdevice *s; |
| |
| if (arg >= dev->n_subdevices) |
| return -EINVAL; |
| s = dev->subdevices + arg; |
| |
| if (s->lock && s->lock != file) |
| return -EACCES; |
| |
| if (!s->busy) |
| return 0; |
| |
| if (s->busy != file) |
| return -EBUSY; |
| |
| if (s->poll) |
| return s->poll(dev, s); |
| |
| return -EINVAL; |
| } |
| |
| static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s) |
| { |
| int ret = 0; |
| |
| if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) && s->cancel) |
| ret = s->cancel(dev, s); |
| |
| do_become_nonbusy(dev, s); |
| |
| return ret; |
| } |
| |
| static void comedi_unmap(struct vm_area_struct *area) |
| { |
| struct comedi_async *async; |
| struct comedi_device *dev; |
| |
| async = area->vm_private_data; |
| dev = async->subdevice->device; |
| |
| mutex_lock(&dev->mutex); |
| async->mmap_count--; |
| mutex_unlock(&dev->mutex); |
| } |
| |
| static struct vm_operations_struct comedi_vm_ops = { |
| .close = comedi_unmap, |
| }; |
| |
| static int comedi_mmap(struct file *file, struct vm_area_struct *vma) |
| { |
| const unsigned minor = iminor(file->f_dentry->d_inode); |
| struct comedi_device_file_info *dev_file_info = |
| comedi_get_device_file_info(minor); |
| struct comedi_device *dev = dev_file_info->device; |
| struct comedi_async *async = NULL; |
| unsigned long start = vma->vm_start; |
| unsigned long size; |
| int n_pages; |
| int i; |
| int retval; |
| struct comedi_subdevice *s; |
| |
| mutex_lock(&dev->mutex); |
| if (!dev->attached) { |
| DPRINTK("no driver configured on comedi%i\n", dev->minor); |
| retval = -ENODEV; |
| goto done; |
| } |
| if (vma->vm_flags & VM_WRITE) |
| s = comedi_get_write_subdevice(dev_file_info); |
| else |
| s = comedi_get_read_subdevice(dev_file_info); |
| |
| if (s == NULL) { |
| retval = -EINVAL; |
| goto done; |
| } |
| async = s->async; |
| if (async == NULL) { |
| retval = -EINVAL; |
| goto done; |
| } |
| |
| if (vma->vm_pgoff != 0) { |
| DPRINTK("comedi: mmap() offset must be 0.\n"); |
| retval = -EINVAL; |
| goto done; |
| } |
| |
| size = vma->vm_end - vma->vm_start; |
| if (size > async->prealloc_bufsz) { |
| retval = -EFAULT; |
| goto done; |
| } |
| if (size & (~PAGE_MASK)) { |
| retval = -EFAULT; |
| goto done; |
| } |
| |
| n_pages = size >> PAGE_SHIFT; |
| for (i = 0; i < n_pages; ++i) { |
| if (remap_pfn_range(vma, start, |
| page_to_pfn(virt_to_page |
| (async->buf_page_list |
| [i].virt_addr)), PAGE_SIZE, |
| PAGE_SHARED)) { |
| retval = -EAGAIN; |
| goto done; |
| } |
| start += PAGE_SIZE; |
| } |
| |
| vma->vm_ops = &comedi_vm_ops; |
| vma->vm_private_data = async; |
| |
| async->mmap_count++; |
| |
| retval = 0; |
| done: |
| mutex_unlock(&dev->mutex); |
| return retval; |
| } |
| |
| static unsigned int comedi_poll(struct file *file, poll_table * wait) |
| { |
| unsigned int mask = 0; |
| const unsigned minor = iminor(file->f_dentry->d_inode); |
| struct comedi_device_file_info *dev_file_info = |
| comedi_get_device_file_info(minor); |
| struct comedi_device *dev = dev_file_info->device; |
| struct comedi_subdevice *read_subdev; |
| struct comedi_subdevice *write_subdev; |
| |
| mutex_lock(&dev->mutex); |
| if (!dev->attached) { |
| DPRINTK("no driver configured on comedi%i\n", dev->minor); |
| mutex_unlock(&dev->mutex); |
| return 0; |
| } |
| |
| mask = 0; |
| read_subdev = comedi_get_read_subdevice(dev_file_info); |
| if (read_subdev) { |
| poll_wait(file, &read_subdev->async->wait_head, wait); |
| if (!read_subdev->busy |
| || comedi_buf_read_n_available(read_subdev->async) > 0 |
| || !(comedi_get_subdevice_runflags(read_subdev) & |
| SRF_RUNNING)) { |
| mask |= POLLIN | POLLRDNORM; |
| } |
| } |
| write_subdev = comedi_get_write_subdevice(dev_file_info); |
| if (write_subdev) { |
| poll_wait(file, &write_subdev->async->wait_head, wait); |
| comedi_buf_write_alloc(write_subdev->async, |
| write_subdev->async->prealloc_bufsz); |
| if (!write_subdev->busy |
| || !(comedi_get_subdevice_runflags(write_subdev) & |
| SRF_RUNNING) |
| || comedi_buf_write_n_allocated(write_subdev->async) >= |
| bytes_per_sample(write_subdev->async->subdevice)) { |
| mask |= POLLOUT | POLLWRNORM; |
| } |
| } |
| |
| mutex_unlock(&dev->mutex); |
| return mask; |
| } |
| |
| static ssize_t comedi_write(struct file *file, const char __user *buf, |
| size_t nbytes, loff_t *offset) |
| { |
| struct comedi_subdevice *s; |
| struct comedi_async *async; |
| int n, m, count = 0, retval = 0; |
| DECLARE_WAITQUEUE(wait, current); |
| const unsigned minor = iminor(file->f_dentry->d_inode); |
| struct comedi_device_file_info *dev_file_info = |
| comedi_get_device_file_info(minor); |
| struct comedi_device *dev = dev_file_info->device; |
| |
| if (!dev->attached) { |
| DPRINTK("no driver configured on comedi%i\n", dev->minor); |
| retval = -ENODEV; |
| goto done; |
| } |
| |
| s = comedi_get_write_subdevice(dev_file_info); |
| if (s == NULL) { |
| retval = -EIO; |
| goto done; |
| } |
| async = s->async; |
| |
| if (!nbytes) { |
| retval = 0; |
| goto done; |
| } |
| if (!s->busy) { |
| retval = 0; |
| goto done; |
| } |
| if (s->busy != file) { |
| retval = -EACCES; |
| goto done; |
| } |
| add_wait_queue(&async->wait_head, &wait); |
| while (nbytes > 0 && !retval) { |
| set_current_state(TASK_INTERRUPTIBLE); |
| |
| if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) { |
| if (count == 0) { |
| if (comedi_get_subdevice_runflags(s) & |
| SRF_ERROR) { |
| retval = -EPIPE; |
| } else { |
| retval = 0; |
| } |
| do_become_nonbusy(dev, s); |
| } |
| break; |
| } |
| |
| n = nbytes; |
| |
| m = n; |
| if (async->buf_write_ptr + m > async->prealloc_bufsz) |
| m = async->prealloc_bufsz - async->buf_write_ptr; |
| comedi_buf_write_alloc(async, async->prealloc_bufsz); |
| if (m > comedi_buf_write_n_allocated(async)) |
| m = comedi_buf_write_n_allocated(async); |
| if (m < n) |
| n = m; |
| |
| if (n == 0) { |
| if (file->f_flags & O_NONBLOCK) { |
| retval = -EAGAIN; |
| break; |
| } |
| if (signal_pending(current)) { |
| retval = -ERESTARTSYS; |
| break; |
| } |
| schedule(); |
| if (!s->busy) |
| break; |
| if (s->busy != file) { |
| retval = -EACCES; |
| break; |
| } |
| continue; |
| } |
| |
| m = copy_from_user(async->prealloc_buf + async->buf_write_ptr, |
| buf, n); |
| if (m) { |
| n -= m; |
| retval = -EFAULT; |
| } |
| comedi_buf_write_free(async, n); |
| |
| count += n; |
| nbytes -= n; |
| |
| buf += n; |
| break; /* makes device work like a pipe */ |
| } |
| set_current_state(TASK_RUNNING); |
| remove_wait_queue(&async->wait_head, &wait); |
| |
| done: |
| return count ? count : retval; |
| } |
| |
| static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes, |
| loff_t *offset) |
| { |
| struct comedi_subdevice *s; |
| struct comedi_async *async; |
| int n, m, count = 0, retval = 0; |
| DECLARE_WAITQUEUE(wait, current); |
| const unsigned minor = iminor(file->f_dentry->d_inode); |
| struct comedi_device_file_info *dev_file_info = |
| comedi_get_device_file_info(minor); |
| struct comedi_device *dev = dev_file_info->device; |
| |
| if (!dev->attached) { |
| DPRINTK("no driver configured on comedi%i\n", dev->minor); |
| retval = -ENODEV; |
| goto done; |
| } |
| |
| s = comedi_get_read_subdevice(dev_file_info); |
| if (s == NULL) { |
| retval = -EIO; |
| goto done; |
| } |
| async = s->async; |
| if (!nbytes) { |
| retval = 0; |
| goto done; |
| } |
| if (!s->busy) { |
| retval = 0; |
| goto done; |
| } |
| if (s->busy != file) { |
| retval = -EACCES; |
| goto done; |
| } |
| |
| add_wait_queue(&async->wait_head, &wait); |
| while (nbytes > 0 && !retval) { |
| set_current_state(TASK_INTERRUPTIBLE); |
| |
| n = nbytes; |
| |
| m = comedi_buf_read_n_available(async); |
| /* printk("%d available\n",m); */ |
| if (async->buf_read_ptr + m > async->prealloc_bufsz) |
| m = async->prealloc_bufsz - async->buf_read_ptr; |
| /* printk("%d contiguous\n",m); */ |
| if (m < n) |
| n = m; |
| |
| if (n == 0) { |
| if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) { |
| do_become_nonbusy(dev, s); |
| if (comedi_get_subdevice_runflags(s) & |
| SRF_ERROR) { |
| retval = -EPIPE; |
| } else { |
| retval = 0; |
| } |
| break; |
| } |
| if (file->f_flags & O_NONBLOCK) { |
| retval = -EAGAIN; |
| break; |
| } |
| if (signal_pending(current)) { |
| retval = -ERESTARTSYS; |
| break; |
| } |
| schedule(); |
| if (!s->busy) { |
| retval = 0; |
| break; |
| } |
| if (s->busy != file) { |
| retval = -EACCES; |
| break; |
| } |
| continue; |
| } |
| m = copy_to_user(buf, async->prealloc_buf + |
| async->buf_read_ptr, n); |
| if (m) { |
| n -= m; |
| retval = -EFAULT; |
| } |
| |
| comedi_buf_read_alloc(async, n); |
| comedi_buf_read_free(async, n); |
| |
| count += n; |
| nbytes -= n; |
| |
| buf += n; |
| break; /* makes device work like a pipe */ |
| } |
| if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR | SRF_RUNNING)) && |
| async->buf_read_count - async->buf_write_count == 0) { |
| do_become_nonbusy(dev, s); |
| } |
| set_current_state(TASK_RUNNING); |
| remove_wait_queue(&async->wait_head, &wait); |
| |
| done: |
| return count ? count : retval; |
| } |
| |
| /* |
| This function restores a subdevice to an idle state. |
| */ |
| void do_become_nonbusy(struct comedi_device *dev, struct comedi_subdevice *s) |
| { |
| struct comedi_async *async = s->async; |
| |
| comedi_set_subdevice_runflags(s, SRF_RUNNING, 0); |
| if (async) { |
| comedi_reset_async_buf(async); |
| async->inttrig = NULL; |
| } else { |
| printk(KERN_ERR |
| "BUG: (?) do_become_nonbusy called with async=0\n"); |
| } |
| |
| s->busy = NULL; |
| } |
| |
| static int comedi_open(struct inode *inode, struct file *file) |
| { |
| const unsigned minor = iminor(inode); |
| struct comedi_device_file_info *dev_file_info = |
| comedi_get_device_file_info(minor); |
| struct comedi_device *dev = |
| dev_file_info ? dev_file_info->device : NULL; |
| |
| if (dev == NULL) { |
| DPRINTK("invalid minor number\n"); |
| return -ENODEV; |
| } |
| |
| /* This is slightly hacky, but we want module autoloading |
| * to work for root. |
| * case: user opens device, attached -> ok |
| * case: user opens device, unattached, in_request_module=0 -> autoload |
| * case: user opens device, unattached, in_request_module=1 -> fail |
| * case: root opens device, attached -> ok |
| * case: root opens device, unattached, in_request_module=1 -> ok |
| * (typically called from modprobe) |
| * case: root opens device, unattached, in_request_module=0 -> autoload |
| * |
| * The last could be changed to "-> ok", which would deny root |
| * autoloading. |
| */ |
| mutex_lock(&dev->mutex); |
| if (dev->attached) |
| goto ok; |
| if (!capable(CAP_NET_ADMIN) && dev->in_request_module) { |
| DPRINTK("in request module\n"); |
| mutex_unlock(&dev->mutex); |
| return -ENODEV; |
| } |
| if (capable(CAP_NET_ADMIN) && dev->in_request_module) |
| goto ok; |
| |
| dev->in_request_module = 1; |
| |
| #ifdef CONFIG_KMOD |
| mutex_unlock(&dev->mutex); |
| request_module("char-major-%i-%i", COMEDI_MAJOR, dev->minor); |
| mutex_lock(&dev->mutex); |
| #endif |
| |
| dev->in_request_module = 0; |
| |
| if (!dev->attached && !capable(CAP_NET_ADMIN)) { |
| DPRINTK("not attached and not CAP_NET_ADMIN\n"); |
| mutex_unlock(&dev->mutex); |
| return -ENODEV; |
| } |
| ok: |
| __module_get(THIS_MODULE); |
| |
| if (dev->attached) { |
| if (!try_module_get(dev->driver->module)) { |
| module_put(THIS_MODULE); |
| mutex_unlock(&dev->mutex); |
| return -ENOSYS; |
| } |
| } |
| |
| if (dev->attached && dev->use_count == 0 && dev->open) { |
| int rc = dev->open(dev); |
| if (rc < 0) { |
| module_put(dev->driver->module); |
| module_put(THIS_MODULE); |
| mutex_unlock(&dev->mutex); |
| return rc; |
| } |
| } |
| |
| dev->use_count++; |
| |
| mutex_unlock(&dev->mutex); |
| |
| return 0; |
| } |
| |
| static int comedi_close(struct inode *inode, struct file *file) |
| { |
| const unsigned minor = iminor(inode); |
| struct comedi_device_file_info *dev_file_info = |
| comedi_get_device_file_info(minor); |
| struct comedi_device *dev = dev_file_info->device; |
| struct comedi_subdevice *s = NULL; |
| int i; |
| |
| mutex_lock(&dev->mutex); |
| |
| if (dev->subdevices) { |
| for (i = 0; i < dev->n_subdevices; i++) { |
| s = dev->subdevices + i; |
| |
| if (s->busy == file) |
| do_cancel(dev, s); |
| if (s->lock == file) |
| s->lock = NULL; |
| } |
| } |
| if (dev->attached && dev->use_count == 1 && dev->close) |
| dev->close(dev); |
| |
| module_put(THIS_MODULE); |
| if (dev->attached) |
| module_put(dev->driver->module); |
| |
| dev->use_count--; |
| |
| mutex_unlock(&dev->mutex); |
| |
| if (file->f_flags & FASYNC) |
| comedi_fasync(-1, file, 0); |
| |
| return 0; |
| } |
| |
| static int comedi_fasync(int fd, struct file *file, int on) |
| { |
| const unsigned minor = iminor(file->f_dentry->d_inode); |
| struct comedi_device_file_info *dev_file_info = |
| comedi_get_device_file_info(minor); |
| |
| struct comedi_device *dev = dev_file_info->device; |
| |
| return fasync_helper(fd, file, on, &dev->async_queue); |
| } |
| |
| const struct file_operations comedi_fops = { |
| .owner = THIS_MODULE, |
| .unlocked_ioctl = comedi_unlocked_ioctl, |
| .compat_ioctl = comedi_compat_ioctl, |
| .open = comedi_open, |
| .release = comedi_close, |
| .read = comedi_read, |
| .write = comedi_write, |
| .mmap = comedi_mmap, |
| .poll = comedi_poll, |
| .fasync = comedi_fasync, |
| .llseek = noop_llseek, |
| }; |
| |
| struct class *comedi_class; |
| static struct cdev comedi_cdev; |
| |
| static void comedi_cleanup_legacy_minors(void) |
| { |
| unsigned i; |
| |
| for (i = 0; i < comedi_num_legacy_minors; i++) |
| comedi_free_board_minor(i); |
| } |
| |
| static int __init comedi_init(void) |
| { |
| int i; |
| int retval; |
| |
| printk(KERN_INFO "comedi: version " COMEDI_RELEASE |
| " - http://www.comedi.org\n"); |
| |
| if (comedi_num_legacy_minors < 0 || |
| comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) { |
| printk(KERN_ERR "comedi: error: invalid value for module " |
| "parameter \"comedi_num_legacy_minors\". Valid values " |
| "are 0 through %i.\n", COMEDI_NUM_BOARD_MINORS); |
| return -EINVAL; |
| } |
| |
| /* |
| * comedi is unusable if both comedi_autoconfig and |
| * comedi_num_legacy_minors are zero, so we might as well adjust the |
| * defaults in that case |
| */ |
| if (comedi_autoconfig == 0 && comedi_num_legacy_minors == 0) |
| comedi_num_legacy_minors = 16; |
| |
| memset(comedi_file_info_table, 0, |
| sizeof(struct comedi_device_file_info *) * COMEDI_NUM_MINORS); |
| |
| retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0), |
| COMEDI_NUM_MINORS, "comedi"); |
| if (retval) |
| return -EIO; |
| cdev_init(&comedi_cdev, &comedi_fops); |
| comedi_cdev.owner = THIS_MODULE; |
| kobject_set_name(&comedi_cdev.kobj, "comedi"); |
| if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) { |
| unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), |
| COMEDI_NUM_MINORS); |
| return -EIO; |
| } |
| comedi_class = class_create(THIS_MODULE, "comedi"); |
| if (IS_ERR(comedi_class)) { |
| printk(KERN_ERR "comedi: failed to create class"); |
| cdev_del(&comedi_cdev); |
| unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), |
| COMEDI_NUM_MINORS); |
| return PTR_ERR(comedi_class); |
| } |
| |
| /* XXX requires /proc interface */ |
| comedi_proc_init(); |
| |
| /* create devices files for legacy/manual use */ |
| for (i = 0; i < comedi_num_legacy_minors; i++) { |
| int minor; |
| minor = comedi_alloc_board_minor(NULL); |
| if (minor < 0) { |
| comedi_cleanup_legacy_minors(); |
| cdev_del(&comedi_cdev); |
| unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), |
| COMEDI_NUM_MINORS); |
| return minor; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static void __exit comedi_cleanup(void) |
| { |
| int i; |
| |
| comedi_cleanup_legacy_minors(); |
| for (i = 0; i < COMEDI_NUM_MINORS; ++i) |
| BUG_ON(comedi_file_info_table[i]); |
| |
| class_destroy(comedi_class); |
| cdev_del(&comedi_cdev); |
| unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS); |
| |
| comedi_proc_cleanup(); |
| } |
| |
| module_init(comedi_init); |
| module_exit(comedi_cleanup); |
| |
| void comedi_error(const struct comedi_device *dev, const char *s) |
| { |
| printk(KERN_ERR "comedi%d: %s: %s\n", dev->minor, |
| dev->driver->driver_name, s); |
| } |
| EXPORT_SYMBOL(comedi_error); |
| |
| void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s) |
| { |
| struct comedi_async *async = s->async; |
| unsigned runflags = 0; |
| unsigned runflags_mask = 0; |
| |
| /* DPRINTK("comedi_event 0x%x\n",mask); */ |
| |
| if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) == 0) |
| return; |
| |
| if (s-> |
| async->events & (COMEDI_CB_EOA | COMEDI_CB_ERROR | |
| COMEDI_CB_OVERFLOW)) { |
| runflags_mask |= SRF_RUNNING; |
| } |
| /* remember if an error event has occured, so an error |
| * can be returned the next time the user does a read() */ |
| if (s->async->events & (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)) { |
| runflags_mask |= SRF_ERROR; |
| runflags |= SRF_ERROR; |
| } |
| if (runflags_mask) { |
| /*sets SRF_ERROR and SRF_RUNNING together atomically */ |
| comedi_set_subdevice_runflags(s, runflags_mask, runflags); |
| } |
| |
| if (async->cb_mask & s->async->events) { |
| if (comedi_get_subdevice_runflags(s) & SRF_USER) { |
| wake_up_interruptible(&async->wait_head); |
| if (s->subdev_flags & SDF_CMD_READ) |
| kill_fasync(&dev->async_queue, SIGIO, POLL_IN); |
| if (s->subdev_flags & SDF_CMD_WRITE) |
| kill_fasync(&dev->async_queue, SIGIO, POLL_OUT); |
| } else { |
| if (async->cb_func) |
| async->cb_func(s->async->events, async->cb_arg); |
| } |
| } |
| s->async->events = 0; |
| } |
| EXPORT_SYMBOL(comedi_event); |
| |
| unsigned comedi_get_subdevice_runflags(struct comedi_subdevice *s) |
| { |
| unsigned long flags; |
| unsigned runflags; |
| |
| spin_lock_irqsave(&s->spin_lock, flags); |
| runflags = s->runflags; |
| spin_unlock_irqrestore(&s->spin_lock, flags); |
| return runflags; |
| } |
| EXPORT_SYMBOL(comedi_get_subdevice_runflags); |
| |
| static int is_device_busy(struct comedi_device *dev) |
| { |
| struct comedi_subdevice *s; |
| int i; |
| |
| if (!dev->attached) |
| return 0; |
| |
| for (i = 0; i < dev->n_subdevices; i++) { |
| s = dev->subdevices + i; |
| if (s->busy) |
| return 1; |
| if (s->async && s->async->mmap_count) |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| static void comedi_device_init(struct comedi_device *dev) |
| { |
| memset(dev, 0, sizeof(struct comedi_device)); |
| spin_lock_init(&dev->spinlock); |
| mutex_init(&dev->mutex); |
| dev->minor = -1; |
| } |
| |
| static void comedi_device_cleanup(struct comedi_device *dev) |
| { |
| if (dev == NULL) |
| return; |
| mutex_lock(&dev->mutex); |
| comedi_device_detach(dev); |
| mutex_unlock(&dev->mutex); |
| mutex_destroy(&dev->mutex); |
| } |
| |
| int comedi_alloc_board_minor(struct device *hardware_device) |
| { |
| unsigned long flags; |
| struct comedi_device_file_info *info; |
| struct device *csdev; |
| unsigned i; |
| int retval; |
| |
| info = kzalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL); |
| if (info == NULL) |
| return -ENOMEM; |
| info->device = kzalloc(sizeof(struct comedi_device), GFP_KERNEL); |
| if (info->device == NULL) { |
| kfree(info); |
| return -ENOMEM; |
| } |
| comedi_device_init(info->device); |
| spin_lock_irqsave(&comedi_file_info_table_lock, flags); |
| for (i = 0; i < COMEDI_NUM_BOARD_MINORS; ++i) { |
| if (comedi_file_info_table[i] == NULL) { |
| comedi_file_info_table[i] = info; |
| break; |
| } |
| } |
| spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); |
| if (i == COMEDI_NUM_BOARD_MINORS) { |
| comedi_device_cleanup(info->device); |
| kfree(info->device); |
| kfree(info); |
| printk(KERN_ERR |
| "comedi: error: " |
| "ran out of minor numbers for board device files.\n"); |
| return -EBUSY; |
| } |
| info->device->minor = i; |
| csdev = COMEDI_DEVICE_CREATE(comedi_class, NULL, |
| MKDEV(COMEDI_MAJOR, i), NULL, |
| hardware_device, "comedi%i", i); |
| if (!IS_ERR(csdev)) |
| info->device->class_dev = csdev; |
| dev_set_drvdata(csdev, info); |
| retval = device_create_file(csdev, &dev_attr_max_read_buffer_kb); |
| if (retval) { |
| printk(KERN_ERR |
| "comedi: " |
| "failed to create sysfs attribute file \"%s\".\n", |
| dev_attr_max_read_buffer_kb.attr.name); |
| comedi_free_board_minor(i); |
| return retval; |
| } |
| retval = device_create_file(csdev, &dev_attr_read_buffer_kb); |
| if (retval) { |
| printk(KERN_ERR |
| "comedi: " |
| "failed to create sysfs attribute file \"%s\".\n", |
| dev_attr_read_buffer_kb.attr.name); |
| comedi_free_board_minor(i); |
| return retval; |
| } |
| retval = device_create_file(csdev, &dev_attr_max_write_buffer_kb); |
| if (retval) { |
| printk(KERN_ERR |
| "comedi: " |
| "failed to create sysfs attribute file \"%s\".\n", |
| dev_attr_max_write_buffer_kb.attr.name); |
| comedi_free_board_minor(i); |
| return retval; |
| } |
| retval = device_create_file(csdev, &dev_attr_write_buffer_kb); |
| if (retval) { |
| printk(KERN_ERR |
| "comedi: " |
| "failed to create sysfs attribute file \"%s\".\n", |
| dev_attr_write_buffer_kb.attr.name); |
| comedi_free_board_minor(i); |
| return retval; |
| } |
| return i; |
| } |
| |
| void comedi_free_board_minor(unsigned minor) |
| { |
| unsigned long flags; |
| struct comedi_device_file_info *info; |
| |
| BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS); |
| spin_lock_irqsave(&comedi_file_info_table_lock, flags); |
| info = comedi_file_info_table[minor]; |
| comedi_file_info_table[minor] = NULL; |
| spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); |
| |
| if (info) { |
| struct comedi_device *dev = info->device; |
| if (dev) { |
| if (dev->class_dev) { |
| device_destroy(comedi_class, |
| MKDEV(COMEDI_MAJOR, dev->minor)); |
| } |
| comedi_device_cleanup(dev); |
| kfree(dev); |
| } |
| kfree(info); |
| } |
| } |
| |
| int comedi_alloc_subdevice_minor(struct comedi_device *dev, |
| struct comedi_subdevice *s) |
| { |
| unsigned long flags; |
| struct comedi_device_file_info *info; |
| struct device *csdev; |
| unsigned i; |
| int retval; |
| |
| info = kmalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL); |
| if (info == NULL) |
| return -ENOMEM; |
| info->device = dev; |
| info->read_subdevice = s; |
| info->write_subdevice = s; |
| spin_lock_irqsave(&comedi_file_info_table_lock, flags); |
| for (i = COMEDI_FIRST_SUBDEVICE_MINOR; i < COMEDI_NUM_MINORS; ++i) { |
| if (comedi_file_info_table[i] == NULL) { |
| comedi_file_info_table[i] = info; |
| break; |
| } |
| } |
| spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); |
| if (i == COMEDI_NUM_MINORS) { |
| kfree(info); |
| printk(KERN_ERR |
| "comedi: error: " |
| "ran out of minor numbers for board device files.\n"); |
| return -EBUSY; |
| } |
| s->minor = i; |
| csdev = COMEDI_DEVICE_CREATE(comedi_class, dev->class_dev, |
| MKDEV(COMEDI_MAJOR, i), NULL, NULL, |
| "comedi%i_subd%i", dev->minor, |
| (int)(s - dev->subdevices)); |
| if (!IS_ERR(csdev)) |
| s->class_dev = csdev; |
| dev_set_drvdata(csdev, info); |
| retval = device_create_file(csdev, &dev_attr_max_read_buffer_kb); |
| if (retval) { |
| printk(KERN_ERR |
| "comedi: " |
| "failed to create sysfs attribute file \"%s\".\n", |
| dev_attr_max_read_buffer_kb.attr.name); |
| comedi_free_subdevice_minor(s); |
| return retval; |
| } |
| retval = device_create_file(csdev, &dev_attr_read_buffer_kb); |
| if (retval) { |
| printk(KERN_ERR |
| "comedi: " |
| "failed to create sysfs attribute file \"%s\".\n", |
| dev_attr_read_buffer_kb.attr.name); |
| comedi_free_subdevice_minor(s); |
| return retval; |
| } |
| retval = device_create_file(csdev, &dev_attr_max_write_buffer_kb); |
| if (retval) { |
| printk(KERN_ERR |
| "comedi: " |
| "failed to create sysfs attribute file \"%s\".\n", |
| dev_attr_max_write_buffer_kb.attr.name); |
| comedi_free_subdevice_minor(s); |
| return retval; |
| } |
| retval = device_create_file(csdev, &dev_attr_write_buffer_kb); |
| if (retval) { |
| printk(KERN_ERR |
| "comedi: " |
| "failed to create sysfs attribute file \"%s\".\n", |
| dev_attr_write_buffer_kb.attr.name); |
| comedi_free_subdevice_minor(s); |
| return retval; |
| } |
| return i; |
| } |
| |
| void comedi_free_subdevice_minor(struct comedi_subdevice *s) |
| { |
| unsigned long flags; |
| struct comedi_device_file_info *info; |
| |
| if (s == NULL) |
| return; |
| if (s->minor < 0) |
| return; |
| |
| BUG_ON(s->minor >= COMEDI_NUM_MINORS); |
| BUG_ON(s->minor < COMEDI_FIRST_SUBDEVICE_MINOR); |
| |
| spin_lock_irqsave(&comedi_file_info_table_lock, flags); |
| info = comedi_file_info_table[s->minor]; |
| comedi_file_info_table[s->minor] = NULL; |
| spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); |
| |
| if (s->class_dev) { |
| device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor)); |
| s->class_dev = NULL; |
| } |
| kfree(info); |
| } |
| |
| struct comedi_device_file_info *comedi_get_device_file_info(unsigned minor) |
| { |
| unsigned long flags; |
| struct comedi_device_file_info *info; |
| |
| BUG_ON(minor >= COMEDI_NUM_MINORS); |
| spin_lock_irqsave(&comedi_file_info_table_lock, flags); |
| info = comedi_file_info_table[minor]; |
| spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); |
| return info; |
| } |
| EXPORT_SYMBOL_GPL(comedi_get_device_file_info); |
| |
| static int resize_async_buffer(struct comedi_device *dev, |
| struct comedi_subdevice *s, |
| struct comedi_async *async, unsigned new_size) |
| { |
| int retval; |
| |
| if (new_size > async->max_bufsize) |
| return -EPERM; |
| |
| if (s->busy) { |
| DPRINTK("subdevice is busy, cannot resize buffer\n"); |
| return -EBUSY; |
| } |
| if (async->mmap_count) { |
| DPRINTK("subdevice is mmapped, cannot resize buffer\n"); |
| return -EBUSY; |
| } |
| |
| if (!async->prealloc_buf) |
| return -EINVAL; |
| |
| /* make sure buffer is an integral number of pages |
| * (we round up) */ |
| new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK; |
| |
| retval = comedi_buf_alloc(dev, s, new_size); |
| if (retval < 0) |
| return retval; |
| |
| if (s->buf_change) { |
| retval = s->buf_change(dev, s, new_size); |
| if (retval < 0) |
| return retval; |
| } |
| |
| DPRINTK("comedi%i subd %d buffer resized to %i bytes\n", |
| dev->minor, (int)(s - dev->subdevices), async->prealloc_bufsz); |
| return 0; |
| } |
| |
| /* sysfs attribute files */ |
| |
| static const unsigned bytes_per_kibi = 1024; |
| |
| static ssize_t show_max_read_buffer_kb(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| ssize_t retval; |
| struct comedi_device_file_info *info = dev_get_drvdata(dev); |
| unsigned max_buffer_size_kb = 0; |
| struct comedi_subdevice *const read_subdevice = |
| comedi_get_read_subdevice(info); |
| |
| mutex_lock(&info->device->mutex); |
| if (read_subdevice && |
| (read_subdevice->subdev_flags & SDF_CMD_READ) && |
| read_subdevice->async) { |
| max_buffer_size_kb = read_subdevice->async->max_bufsize / |
| bytes_per_kibi; |
| } |
| retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb); |
| mutex_unlock(&info->device->mutex); |
| |
| return retval; |
| } |
| |
| static ssize_t store_max_read_buffer_kb(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t count) |
| { |
| struct comedi_device_file_info *info = dev_get_drvdata(dev); |
| unsigned long new_max_size_kb; |
| uint64_t new_max_size; |
| struct comedi_subdevice *const read_subdevice = |
| comedi_get_read_subdevice(info); |
| |
| if (strict_strtoul(buf, 10, &new_max_size_kb)) |
| return -EINVAL; |
| if (new_max_size_kb != (uint32_t) new_max_size_kb) |
| return -EINVAL; |
| new_max_size = ((uint64_t) new_max_size_kb) * bytes_per_kibi; |
| if (new_max_size != (uint32_t) new_max_size) |
| return -EINVAL; |
| |
| mutex_lock(&info->device->mutex); |
| if (read_subdevice == NULL || |
| (read_subdevice->subdev_flags & SDF_CMD_READ) == 0 || |
| read_subdevice->async == NULL) { |
| mutex_unlock(&info->device->mutex); |
| return -EINVAL; |
| } |
| read_subdevice->async->max_bufsize = new_max_size; |
| mutex_unlock(&info->device->mutex); |
| |
| return count; |
| } |
| |
| static struct device_attribute dev_attr_max_read_buffer_kb = { |
| .attr = { |
| .name = "max_read_buffer_kb", |
| .mode = S_IRUGO | S_IWUSR}, |
| .show = &show_max_read_buffer_kb, |
| .store = &store_max_read_buffer_kb |
| }; |
| |
| static ssize_t show_read_buffer_kb(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| ssize_t retval; |
| struct comedi_device_file_info *info = dev_get_drvdata(dev); |
| unsigned buffer_size_kb = 0; |
| struct comedi_subdevice *const read_subdevice = |
| comedi_get_read_subdevice(info); |
| |
| mutex_lock(&info->device->mutex); |
| if (read_subdevice && |
| (read_subdevice->subdev_flags & SDF_CMD_READ) && |
| read_subdevice->async) { |
| buffer_size_kb = read_subdevice->async->prealloc_bufsz / |
| bytes_per_kibi; |
| } |
| retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb); |
| mutex_unlock(&info->device->mutex); |
| |
| return retval; |
| } |
| |
| static ssize_t store_read_buffer_kb(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t count) |
| { |
| struct comedi_device_file_info *info = dev_get_drvdata(dev); |
| unsigned long new_size_kb; |
| uint64_t new_size; |
| int retval; |
| struct comedi_subdevice *const read_subdevice = |
| comedi_get_read_subdevice(info); |
| |
| if (strict_strtoul(buf, 10, &new_size_kb)) |
| return -EINVAL; |
| if (new_size_kb != (uint32_t) new_size_kb) |
| return -EINVAL; |
| new_size = ((uint64_t) new_size_kb) * bytes_per_kibi; |
| if (new_size != (uint32_t) new_size) |
| return -EINVAL; |
| |
| mutex_lock(&info->device->mutex); |
| if (read_subdevice == NULL || |
| (read_subdevice->subdev_flags & SDF_CMD_READ) == 0 || |
| read_subdevice->async == NULL) { |
| mutex_unlock(&info->device->mutex); |
| return -EINVAL; |
| } |
| retval = resize_async_buffer(info->device, read_subdevice, |
| read_subdevice->async, new_size); |
| mutex_unlock(&info->device->mutex); |
| |
| if (retval < 0) |
| return retval; |
| return count; |
| } |
| |
| static struct device_attribute dev_attr_read_buffer_kb = { |
| .attr = { |
| .name = "read_buffer_kb", |
| .mode = S_IRUGO | S_IWUSR | S_IWGRP}, |
| .show = &show_read_buffer_kb, |
| .store = &store_read_buffer_kb |
| }; |
| |
| static ssize_t show_max_write_buffer_kb(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| ssize_t retval; |
| struct comedi_device_file_info *info = dev_get_drvdata(dev); |
| unsigned max_buffer_size_kb = 0; |
| struct comedi_subdevice *const write_subdevice = |
| comedi_get_write_subdevice(info); |
| |
| mutex_lock(&info->device->mutex); |
| if (write_subdevice && |
| (write_subdevice->subdev_flags & SDF_CMD_WRITE) && |
| write_subdevice->async) { |
| max_buffer_size_kb = write_subdevice->async->max_bufsize / |
| bytes_per_kibi; |
| } |
| retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb); |
| mutex_unlock(&info->device->mutex); |
| |
| return retval; |
| } |
| |
| static ssize_t store_max_write_buffer_kb(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t count) |
| { |
| struct comedi_device_file_info *info = dev_get_drvdata(dev); |
| unsigned long new_max_size_kb; |
| uint64_t new_max_size; |
| struct comedi_subdevice *const write_subdevice = |
| comedi_get_write_subdevice(info); |
| |
| if (strict_strtoul(buf, 10, &new_max_size_kb)) |
| return -EINVAL; |
| if (new_max_size_kb != (uint32_t) new_max_size_kb) |
| return -EINVAL; |
| new_max_size = ((uint64_t) new_max_size_kb) * bytes_per_kibi; |
| if (new_max_size != (uint32_t) new_max_size) |
| return -EINVAL; |
| |
| mutex_lock(&info->device->mutex); |
| if (write_subdevice == NULL || |
| (write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 || |
| write_subdevice->async == NULL) { |
| mutex_unlock(&info->device->mutex); |
| return -EINVAL; |
| } |
| write_subdevice->async->max_bufsize = new_max_size; |
| mutex_unlock(&info->device->mutex); |
| |
| return count; |
| } |
| |
| static struct device_attribute dev_attr_max_write_buffer_kb = { |
| .attr = { |
| .name = "max_write_buffer_kb", |
| .mode = S_IRUGO | S_IWUSR}, |
| .show = &show_max_write_buffer_kb, |
| .store = &store_max_write_buffer_kb |
| }; |
| |
| static ssize_t show_write_buffer_kb(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| ssize_t retval; |
| struct comedi_device_file_info *info = dev_get_drvdata(dev); |
| unsigned buffer_size_kb = 0; |
| struct comedi_subdevice *const write_subdevice = |
| comedi_get_write_subdevice(info); |
| |
| mutex_lock(&info->device->mutex); |
| if (write_subdevice && |
| (write_subdevice->subdev_flags & SDF_CMD_WRITE) && |
| write_subdevice->async) { |
| buffer_size_kb = write_subdevice->async->prealloc_bufsz / |
| bytes_per_kibi; |
| } |
| retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb); |
| mutex_unlock(&info->device->mutex); |
| |
| return retval; |
| } |
| |
| static ssize_t store_write_buffer_kb(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t count) |
| { |
| struct comedi_device_file_info *info = dev_get_drvdata(dev); |
| unsigned long new_size_kb; |
| uint64_t new_size; |
| int retval; |
| struct comedi_subdevice *const write_subdevice = |
| comedi_get_write_subdevice(info); |
| |
| if (strict_strtoul(buf, 10, &new_size_kb)) |
| return -EINVAL; |
| if (new_size_kb != (uint32_t) new_size_kb) |
| return -EINVAL; |
| new_size = ((uint64_t) new_size_kb) * bytes_per_kibi; |
| if (new_size != (uint32_t) new_size) |
| return -EINVAL; |
| |
| mutex_lock(&info->device->mutex); |
| if (write_subdevice == NULL || |
| (write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 || |
| write_subdevice->async == NULL) { |
| mutex_unlock(&info->device->mutex); |
| return -EINVAL; |
| } |
| retval = resize_async_buffer(info->device, write_subdevice, |
| write_subdevice->async, new_size); |
| mutex_unlock(&info->device->mutex); |
| |
| if (retval < 0) |
| return retval; |
| return count; |
| } |
| |
| static struct device_attribute dev_attr_write_buffer_kb = { |
| .attr = { |
| .name = "write_buffer_kb", |
| .mode = S_IRUGO | S_IWUSR | S_IWGRP}, |
| .show = &show_write_buffer_kb, |
| .store = &store_write_buffer_kb |
| }; |