Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 255 insertions, 0 deletions

diff --git a/drivers/comedi/kcomedilib/kcomedilib_main.c b/drivers/comedi/kcomedilib/kcomedilib_main.c
new file mode 100644
index 000000000..43fbe1a63
--- /dev/null
+++ b/drivers/comedi/kcomedilib/kcomedilib_main.c
@@ -0,0 +1,255 @@
+// 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 <linux/comedi.h>
+#include <linux/comedi/comedidev.h>
+#include <linux/comedi/comedilib.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);