diff options
Diffstat (limited to 'drivers/staging/comedi/kcomedilib/kcomedilib_main.c')
| -rw-r--r-- | drivers/staging/comedi/kcomedilib/kcomedilib_main.c | 255 |
1 files changed, 0 insertions, 255 deletions
diff --git a/drivers/staging/comedi/kcomedilib/kcomedilib_main.c b/drivers/staging/comedi/kcomedilib/kcomedilib_main.c deleted file mode 100644 index df9bba1b69ed..000000000000 --- a/drivers/staging/comedi/kcomedilib/kcomedilib_main.c +++ /dev/null @@ -1,255 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0+ -/* - * kcomedilib/kcomedilib.c - * a comedlib interface for kernel modules - * - * COMEDI - Linux Control and Measurement Device Interface - * Copyright (C) 1997-2000 David A. Schleef <ds@schleef.org> - */ - -#include <linux/module.h> - -#include <linux/errno.h> -#include <linux/kernel.h> -#include <linux/sched.h> -#include <linux/fcntl.h> -#include <linux/mm.h> -#include <linux/io.h> - -#include "../comedi.h" -#include "../comedilib.h" -#include "../comedidev.h" - -MODULE_AUTHOR("David Schleef <ds@schleef.org>"); -MODULE_DESCRIPTION("Comedi kernel library"); -MODULE_LICENSE("GPL"); - -struct comedi_device *comedi_open(const char *filename) -{ - struct comedi_device *dev, *retval = NULL; - unsigned int minor; - - if (strncmp(filename, "/dev/comedi", 11) != 0) - return NULL; - - if (kstrtouint(filename + 11, 0, &minor)) - return NULL; - - if (minor >= COMEDI_NUM_BOARD_MINORS) - return NULL; - - dev = comedi_dev_get_from_minor(minor); - if (!dev) - return NULL; - - down_read(&dev->attach_lock); - if (dev->attached) - retval = dev; - else - retval = NULL; - up_read(&dev->attach_lock); - - if (!retval) - comedi_dev_put(dev); - - return retval; -} -EXPORT_SYMBOL_GPL(comedi_open); - -int comedi_close(struct comedi_device *dev) -{ - comedi_dev_put(dev); - return 0; -} -EXPORT_SYMBOL_GPL(comedi_close); - -static int comedi_do_insn(struct comedi_device *dev, - struct comedi_insn *insn, - unsigned int *data) -{ - struct comedi_subdevice *s; - int ret; - - mutex_lock(&dev->mutex); - - if (!dev->attached) { - ret = -EINVAL; - goto error; - } - - /* a subdevice instruction */ - if (insn->subdev >= dev->n_subdevices) { - ret = -EINVAL; - goto error; - } - s = &dev->subdevices[insn->subdev]; - - if (s->type == COMEDI_SUBD_UNUSED) { - dev_err(dev->class_dev, - "%d not usable subdevice\n", insn->subdev); - ret = -EIO; - goto error; - } - - /* XXX check lock */ - - ret = comedi_check_chanlist(s, 1, &insn->chanspec); - if (ret < 0) { - dev_err(dev->class_dev, "bad chanspec\n"); - ret = -EINVAL; - goto error; - } - - if (s->busy) { - ret = -EBUSY; - goto error; - } - s->busy = dev; - - switch (insn->insn) { - case INSN_BITS: - ret = s->insn_bits(dev, s, insn, data); - break; - case INSN_CONFIG: - /* XXX should check instruction length */ - ret = s->insn_config(dev, s, insn, data); - break; - default: - ret = -EINVAL; - break; - } - - s->busy = NULL; -error: - - mutex_unlock(&dev->mutex); - return ret; -} - -int comedi_dio_get_config(struct comedi_device *dev, unsigned int subdev, - unsigned int chan, unsigned int *io) -{ - struct comedi_insn insn; - unsigned int data[2]; - int ret; - - memset(&insn, 0, sizeof(insn)); - insn.insn = INSN_CONFIG; - insn.n = 2; - insn.subdev = subdev; - insn.chanspec = CR_PACK(chan, 0, 0); - data[0] = INSN_CONFIG_DIO_QUERY; - data[1] = 0; - ret = comedi_do_insn(dev, &insn, data); - if (ret >= 0) - *io = data[1]; - return ret; -} -EXPORT_SYMBOL_GPL(comedi_dio_get_config); - -int comedi_dio_config(struct comedi_device *dev, unsigned int subdev, - unsigned int chan, unsigned int io) -{ - struct comedi_insn insn; - - memset(&insn, 0, sizeof(insn)); - insn.insn = INSN_CONFIG; - insn.n = 1; - insn.subdev = subdev; - insn.chanspec = CR_PACK(chan, 0, 0); - - return comedi_do_insn(dev, &insn, &io); -} -EXPORT_SYMBOL_GPL(comedi_dio_config); - -int comedi_dio_bitfield2(struct comedi_device *dev, unsigned int subdev, - unsigned int mask, unsigned int *bits, - unsigned int base_channel) -{ - struct comedi_insn insn; - unsigned int data[2]; - unsigned int n_chan; - unsigned int shift; - int ret; - - base_channel = CR_CHAN(base_channel); - n_chan = comedi_get_n_channels(dev, subdev); - if (base_channel >= n_chan) - return -EINVAL; - - memset(&insn, 0, sizeof(insn)); - insn.insn = INSN_BITS; - insn.chanspec = base_channel; - insn.n = 2; - insn.subdev = subdev; - - data[0] = mask; - data[1] = *bits; - - /* - * Most drivers ignore the base channel in insn->chanspec. - * Fix this here if the subdevice has <= 32 channels. - */ - if (n_chan <= 32) { - shift = base_channel; - if (shift) { - insn.chanspec = 0; - data[0] <<= shift; - data[1] <<= shift; - } - } else { - shift = 0; - } - - ret = comedi_do_insn(dev, &insn, data); - *bits = data[1] >> shift; - return ret; -} -EXPORT_SYMBOL_GPL(comedi_dio_bitfield2); - -int comedi_find_subdevice_by_type(struct comedi_device *dev, int type, - unsigned int subd) -{ - struct comedi_subdevice *s; - int ret = -ENODEV; - - down_read(&dev->attach_lock); - if (dev->attached) - for (; subd < dev->n_subdevices; subd++) { - s = &dev->subdevices[subd]; - if (s->type == type) { - ret = subd; - break; - } - } - up_read(&dev->attach_lock); - return ret; -} -EXPORT_SYMBOL_GPL(comedi_find_subdevice_by_type); - -int comedi_get_n_channels(struct comedi_device *dev, unsigned int subdevice) -{ - int n; - - down_read(&dev->attach_lock); - if (!dev->attached || subdevice >= dev->n_subdevices) - n = 0; - else - n = dev->subdevices[subdevice].n_chan; - up_read(&dev->attach_lock); - - return n; -} -EXPORT_SYMBOL_GPL(comedi_get_n_channels); - -static int __init kcomedilib_module_init(void) -{ - return 0; -} - -static void __exit kcomedilib_module_exit(void) -{ -} - -module_init(kcomedilib_module_init); -module_exit(kcomedilib_module_exit); 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