staging: comedi: move out of staging directory

The comedi code came into the kernel back in 2008, but traces its
lifetime to much much earlier.  It's been polished and buffed and
there's really nothing preventing it from being part of the "real"
portion of the kernel.

So move it to drivers/comedi/ as it belongs there.

Many thanks to the hundreds of developers who did the work to make this
happen.

Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: H Hartley Sweeten <hsweeten@visionengravers.com>
Link: https://lore.kernel.org/r/YHauop4u3sP6lz8j@kroah.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 282 insertions, 0 deletions

diff --git a/drivers/comedi/drivers/ni_670x.c b/drivers/comedi/drivers/ni_670x.c
new file mode 100644
index 000000000000..c197e47486be
--- /dev/null
+++ b/drivers/comedi/drivers/ni_670x.c
@@ -0,0 +1,282 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Comedi driver for NI 670x devices
+ *
+ * COMEDI - Linux Control and Measurement Device Interface
+ * Copyright (C) 1997-2001 David A. Schleef <ds@schleef.org>
+ */
+
+/*
+ * Driver: ni_670x
+ * Description: National Instruments 670x
+ * Author: Bart Joris <bjoris@advalvas.be>
+ * Updated: Wed, 11 Dec 2002 18:25:35 -0800
+ * Devices: [National Instruments] PCI-6703 (ni_670x), PCI-6704
+ * Status: unknown
+ *
+ * Commands are not supported.
+ *
+ * Manuals:
+ *   322110a.pdf	PCI/PXI-6704 User Manual
+ *   322110b.pdf	PCI/PXI-6703/6704 User Manual
+ */
+
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+
+#include "../comedi_pci.h"
+
+#define AO_VALUE_OFFSET			0x00
+#define	AO_CHAN_OFFSET			0x0c
+#define	AO_STATUS_OFFSET		0x10
+#define AO_CONTROL_OFFSET		0x10
+#define	DIO_PORT0_DIR_OFFSET	0x20
+#define	DIO_PORT0_DATA_OFFSET	0x24
+#define	DIO_PORT1_DIR_OFFSET	0x28
+#define	DIO_PORT1_DATA_OFFSET	0x2c
+#define	MISC_STATUS_OFFSET		0x14
+#define	MISC_CONTROL_OFFSET		0x14
+
+enum ni_670x_boardid {
+	BOARD_PCI6703,
+	BOARD_PXI6704,
+	BOARD_PCI6704,
+};
+
+struct ni_670x_board {
+	const char *name;
+	unsigned short ao_chans;
+};
+
+static const struct ni_670x_board ni_670x_boards[] = {
+	[BOARD_PCI6703] = {
+		.name		= "PCI-6703",
+		.ao_chans	= 16,
+	},
+	[BOARD_PXI6704] = {
+		.name		= "PXI-6704",
+		.ao_chans	= 32,
+	},
+	[BOARD_PCI6704] = {
+		.name		= "PCI-6704",
+		.ao_chans	= 32,
+	},
+};
+
+struct ni_670x_private {
+	int boardtype;
+	int dio;
+};
+
+static int ni_670x_ao_insn_write(struct comedi_device *dev,
+				 struct comedi_subdevice *s,
+				 struct comedi_insn *insn,
+				 unsigned int *data)
+{
+	unsigned int chan = CR_CHAN(insn->chanspec);
+	unsigned int val = s->readback[chan];
+	int i;
+
+	/*
+	 * Channel number mapping:
+	 *
+	 * NI 6703/ NI 6704 | NI 6704 Only
+	 * -------------------------------
+	 * vch(0)  :  0     | ich(16) :  1
+	 * vch(1)  :  2     | ich(17) :  3
+	 * ...              | ...
+	 * vch(15) : 30     | ich(31) : 31
+	 */
+	for (i = 0; i < insn->n; i++) {
+		val = data[i];
+		/* First write in channel register which channel to use */
+		writel(((chan & 15) << 1) | ((chan & 16) >> 4),
+		       dev->mmio + AO_CHAN_OFFSET);
+		/* write channel value */
+		writel(val, dev->mmio + AO_VALUE_OFFSET);
+	}
+	s->readback[chan] = val;
+
+	return insn->n;
+}
+
+static int ni_670x_dio_insn_bits(struct comedi_device *dev,
+				 struct comedi_subdevice *s,
+				 struct comedi_insn *insn,
+				 unsigned int *data)
+{
+	if (comedi_dio_update_state(s, data))
+		writel(s->state, dev->mmio + DIO_PORT0_DATA_OFFSET);
+
+	data[1] = readl(dev->mmio + DIO_PORT0_DATA_OFFSET);
+
+	return insn->n;
+}
+
+static int ni_670x_dio_insn_config(struct comedi_device *dev,
+				   struct comedi_subdevice *s,
+				   struct comedi_insn *insn,
+				   unsigned int *data)
+{
+	int ret;
+
+	ret = comedi_dio_insn_config(dev, s, insn, data, 0);
+	if (ret)
+		return ret;
+
+	writel(s->io_bits, dev->mmio + DIO_PORT0_DIR_OFFSET);
+
+	return insn->n;
+}
+
+/* ripped from mite.h and mite_setup2() to avoid mite dependency */
+#define MITE_IODWBSR	0xc0	 /* IO Device Window Base Size Register */
+#define WENAB		BIT(7) /* window enable */
+
+static int ni_670x_mite_init(struct pci_dev *pcidev)
+{
+	void __iomem *mite_base;
+	u32 main_phys_addr;
+
+	/* ioremap the MITE registers (BAR 0) temporarily */
+	mite_base = pci_ioremap_bar(pcidev, 0);
+	if (!mite_base)
+		return -ENOMEM;
+
+	/* set data window to main registers (BAR 1) */
+	main_phys_addr = pci_resource_start(pcidev, 1);
+	writel(main_phys_addr | WENAB, mite_base + MITE_IODWBSR);
+
+	/* finished with MITE registers */
+	iounmap(mite_base);
+	return 0;
+}
+
+static int ni_670x_auto_attach(struct comedi_device *dev,
+			       unsigned long context)
+{
+	struct pci_dev *pcidev = comedi_to_pci_dev(dev);
+	const struct ni_670x_board *board = NULL;
+	struct ni_670x_private *devpriv;
+	struct comedi_subdevice *s;
+	int ret;
+	int i;
+
+	if (context < ARRAY_SIZE(ni_670x_boards))
+		board = &ni_670x_boards[context];
+	if (!board)
+		return -ENODEV;
+	dev->board_ptr = board;
+	dev->board_name = board->name;
+
+	ret = comedi_pci_enable(dev);
+	if (ret)
+		return ret;
+
+	devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
+	if (!devpriv)
+		return -ENOMEM;
+
+	ret = ni_670x_mite_init(pcidev);
+	if (ret)
+		return ret;
+
+	dev->mmio = pci_ioremap_bar(pcidev, 1);
+	if (!dev->mmio)
+		return -ENOMEM;
+
+	ret = comedi_alloc_subdevices(dev, 2);
+	if (ret)
+		return ret;
+
+	s = &dev->subdevices[0];
+	/* analog output subdevice */
+	s->type = COMEDI_SUBD_AO;
+	s->subdev_flags = SDF_WRITABLE;
+	s->n_chan = board->ao_chans;
+	s->maxdata = 0xffff;
+	if (s->n_chan == 32) {
+		const struct comedi_lrange **range_table_list;
+
+		range_table_list = kmalloc_array(32,
+						 sizeof(struct comedi_lrange *),
+						 GFP_KERNEL);
+		if (!range_table_list)
+			return -ENOMEM;
+		s->range_table_list = range_table_list;
+		for (i = 0; i < 16; i++) {
+			range_table_list[i] = &range_bipolar10;
+			range_table_list[16 + i] = &range_0_20mA;
+		}
+	} else {
+		s->range_table = &range_bipolar10;
+	}
+	s->insn_write = ni_670x_ao_insn_write;
+
+	ret = comedi_alloc_subdev_readback(s);
+	if (ret)
+		return ret;
+
+	s = &dev->subdevices[1];
+	/* digital i/o subdevice */
+	s->type = COMEDI_SUBD_DIO;
+	s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
+	s->n_chan = 8;
+	s->maxdata = 1;
+	s->range_table = &range_digital;
+	s->insn_bits = ni_670x_dio_insn_bits;
+	s->insn_config = ni_670x_dio_insn_config;
+
+	/* Config of misc registers */
+	writel(0x10, dev->mmio + MISC_CONTROL_OFFSET);
+	/* Config of ao registers */
+	writel(0x00, dev->mmio + AO_CONTROL_OFFSET);
+
+	return 0;
+}
+
+static void ni_670x_detach(struct comedi_device *dev)
+{
+	struct comedi_subdevice *s;
+
+	comedi_pci_detach(dev);
+	if (dev->n_subdevices) {
+		s = &dev->subdevices[0];
+		if (s)
+			kfree(s->range_table_list);
+	}
+}
+
+static struct comedi_driver ni_670x_driver = {
+	.driver_name	= "ni_670x",
+	.module		= THIS_MODULE,
+	.auto_attach	= ni_670x_auto_attach,
+	.detach		= ni_670x_detach,
+};
+
+static int ni_670x_pci_probe(struct pci_dev *dev,
+			     const struct pci_device_id *id)
+{
+	return comedi_pci_auto_config(dev, &ni_670x_driver, id->driver_data);
+}
+
+static const struct pci_device_id ni_670x_pci_table[] = {
+	{ PCI_VDEVICE(NI, 0x1290), BOARD_PCI6704 },
+	{ PCI_VDEVICE(NI, 0x1920), BOARD_PXI6704 },
+	{ PCI_VDEVICE(NI, 0x2c90), BOARD_PCI6703 },
+	{ 0 }
+};
+MODULE_DEVICE_TABLE(pci, ni_670x_pci_table);
+
+static struct pci_driver ni_670x_pci_driver = {
+	.name		= "ni_670x",
+	.id_table	= ni_670x_pci_table,
+	.probe		= ni_670x_pci_probe,
+	.remove		= comedi_pci_auto_unconfig,
+};
+module_comedi_pci_driver(ni_670x_driver, ni_670x_pci_driver);
+
+MODULE_AUTHOR("Comedi https://www.comedi.org");
+MODULE_DESCRIPTION("Comedi low-level driver");
+MODULE_LICENSE("GPL");