Staging: comedi: add usb dt9812 driver

Data Translation DT9812 USB driver

From: Anders Blomdell <anders.blomdell@control.lth.se>
Cc: David Schleef <ds@schleef.org>
Cc: Frank Mori Hess <fmhess@users.sourceforge.net>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/comedi/drivers/Makefile

@@ -10,3 +10,4 @@ obj-$(CONFIG_COMEDI_PCI_DRIVERS)	+= mite.o
 # Comedi USB drivers
 obj-$(CONFIG_COMEDI_USB_DRIVERS)	+= usbdux.o
 obj-$(CONFIG_COMEDI_USB_DRIVERS)	+= usbduxfast.o
+obj-$(CONFIG_COMEDI_USB_DRIVERS)	+= dt9812.o

drivers/staging/comedi/drivers/dt9812.c

+/*
+ * comedi/drivers/dt9812.c
+ *   COMEDI driver for DataTranslation DT9812 USB module
+ *
+ * Copyright (C) 2005 Anders Blomdell <anders.blomdell@control.lth.se>
+ *
+ * COMEDI - Linux Control and Measurement Device Interface
+ *
+ * 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.
+ *
+ */
+
+/*
+Driver: dt9812
+Description: Data Translation DT9812 USB module
+Author: anders.blomdell@control.lth.se (Anders Blomdell)
+Status: in development
+Devices: [Data Translation] DT9812 (dt9812)
+Updated: Sun Nov 20 20:18:34 EST 2005
+
+This driver works, but bulk transfers not implemented. Might be a starting point
+for someone else. I found out too late that USB has too high latencies (>1 ms)
+for my needs.
+*/
+
+/*
+ * Nota Bene:
+ *   1. All writes to command pipe has to be 32 bytes (ISP1181B SHRTP=0 ?)
+ *   2. The DDK source (as of sep 2005) is in error regarding the
+ *      input MUX bits (example code says P4, but firmware schematics
+ *      says P1).
+ */
+
+#include <linux/version.h>
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/kref.h>
+#include <asm/uaccess.h>
+#include <linux/usb.h>
+#include "../comedidev.h"
+#include "dt9812.h"
+
+#define DT9812_NUM_SLOTS 16
+
+static DECLARE_MUTEX(dt9812_mutex);
+
+static struct usb_device_id dt9812_table[] = {
+	{USB_DEVICE(0x0867, 0x9812)},
+	{}			/* Terminating entry */
+};
+
+MODULE_DEVICE_TABLE(usb, dt9812_table);
+
+typedef struct usb_dt9812 {
+	struct slot_dt9812 *slot;
+	struct usb_device *udev;
+	struct usb_interface *interface;
+	u16 vendor;
+	u16 product;
+	u16 device;
+	u32 serial;
+	struct {
+		__u8 addr;
+		size_t size;
+	} message_pipe, command_write, command_read, write_stream, read_stream;
+	struct kref kref;
+	u16 analog_out_shadow[2];
+	u8 digital_out_shadow;
+} usb_dt9812_t;
+
+typedef struct comedi_dt9812 {
+	struct slot_dt9812 *slot;
+	u32 serial;
+} comedi_dt9812_t;
+
+typedef struct slot_dt9812 {
+	struct semaphore mutex;
+	u32 serial;
+	usb_dt9812_t *usb;
+	comedi_dt9812_t *comedi;
+} slot_dt9812_t;
+
+static const comedi_lrange dt9812_10_ain_range = { 1, {
+			BIP_RANGE(10),
+	}
+};
+
+static const comedi_lrange dt9812_2pt5_ain_range = { 1, {
+			UNI_RANGE(2.5),
+	}
+};
+
+static const comedi_lrange dt9812_10_aout_range = { 1, {
+			BIP_RANGE(10),
+	}
+};
+
+static const comedi_lrange dt9812_2pt5_aout_range = { 1, {
+			UNI_RANGE(2.5),
+	}
+};
+
+static slot_dt9812_t dt9812[DT9812_NUM_SLOTS];
+
+// Useful shorthand access to private data
+#define devpriv ((comedi_dt9812_t *)dev->private)
+
+static inline usb_dt9812_t *to_dt9812_dev(struct kref *d)
+{
+	return container_of(d, usb_dt9812_t, kref);
+}
+
+static void dt9812_delete(struct kref *kref)
+{
+	usb_dt9812_t *dev = to_dt9812_dev(kref);
+
+	usb_put_dev(dev->udev);
+	kfree(dev);
+}
+
+static int dt9812_read_info(usb_dt9812_t * dev,
+	int offset, void *buf, size_t buf_size)
+{
+	dt9812_usb_cmd_t cmd;
+	int count, retval;
+
+	cmd.cmd = cpu_to_le32(DT9812_R_FLASH_DATA);
+	cmd.u.flash_data_info.address =
+		cpu_to_le16(DT9812_DIAGS_BOARD_INFO_ADDR + offset);
+	cmd.u.flash_data_info.numbytes = cpu_to_le16(buf_size);
+
+	count = 32;
+	retval = usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, dev->command_write.addr), &cmd, 32,	// DT9812 only responds to 32 byte writes!!
+		&count, HZ * 1);
+	if (retval == 0) {
+		retval = usb_bulk_msg(dev->udev,
+			usb_rcvbulkpipe(dev->udev, dev->command_read.addr),
+			buf, buf_size, &count, HZ * 1);
+	}
+	return retval;
+}
+
+static int dt9812_read_multiple_registers(usb_dt9812_t * dev,
+	int reg_count, u8 * address, u8 * value)
+{
+	dt9812_usb_cmd_t cmd;
+	int i, count, retval;
+
+	cmd.cmd = cpu_to_le32(DT9812_R_MULTI_BYTE_REG);
+	cmd.u.read_multi_info.count = reg_count;
+	for (i = 0; i < reg_count; i++) {
+		cmd.u.read_multi_info.address[i] = address[i];
+	}
+	count = 32;
+	retval = usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, dev->command_write.addr), &cmd, 32,	// DT9812 only responds to 32 byte writes!!
+		&count, HZ * 1);
+	if (retval == 0) {
+		retval = usb_bulk_msg(dev->udev,
+			usb_rcvbulkpipe(dev->udev, dev->command_read.addr),
+			value, reg_count, &count, HZ * 1);
+	}
+	return retval;
+}
+
+static int dt9812_write_multiple_registers(usb_dt9812_t * dev,
+	int reg_count, u8 * address, u8 * value)
+{
+	dt9812_usb_cmd_t cmd;
+	int i, count, retval;
+
+	cmd.cmd = cpu_to_le32(DT9812_W_MULTI_BYTE_REG);
+	cmd.u.read_multi_info.count = reg_count;
+	for (i = 0; i < reg_count; i++) {
+		cmd.u.write_multi_info.write[i].address = address[i];
+		cmd.u.write_multi_info.write[i].value = value[i];
+	}
+	retval = usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, dev->command_write.addr), &cmd, 32,	// DT9812 only responds to 32 byte writes!!
+		&count, HZ * 1);
+	return retval;
+}
+
+static int dt9812_rmw_multiple_registers(usb_dt9812_t * dev,
+	int reg_count, dt9812_rmw_byte_t rmw[])
+{
+	dt9812_usb_cmd_t cmd;
+	int i, count, retval;
+
+	cmd.cmd = cpu_to_le32(DT9812_RMW_MULTI_BYTE_REG);
+	cmd.u.rmw_multi_info.count = reg_count;
+	for (i = 0; i < reg_count; i++) {
+		cmd.u.rmw_multi_info.rmw[i] = rmw[i];
+	}
+	retval = usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, dev->command_write.addr), &cmd, 32,	// DT9812 only responds to 32 byte writes!!
+		&count, HZ * 1);
+	return retval;
+}
+
+static int dt9812_digital_in(slot_dt9812_t * slot, u8 * bits)
+{
+	int result = -ENODEV;
+
+	down(&slot->mutex);
+	if (slot->usb) {
+		u8 reg[2] = { F020_SFR_P3, F020_SFR_P1 };
+		u8 value[2];
+
+		result = dt9812_read_multiple_registers(slot->usb, 2, reg,
+			value);
+		if (result == 0) {
+			// bits 0-6 in F020_SFR_P3 are bits 0-6 in the digital input port
+			// bit 3 in F020_SFR_P1 is bit 7 in the digital input port
+			*bits = (value[0] & 0x7f) | ((value[1] & 0x08) << 4);
+//    printk("%2.2x, %2.2x -> %2.2x\n", value[0], value[1], *bits);
+		}
+	}
+	up(&slot->mutex);
+
+	return result;
+}
+
+static int dt9812_digital_out(slot_dt9812_t * slot, u8 bits)
+{
+	int result = -ENODEV;
+
+	down(&slot->mutex);
+	if (slot->usb) {
+		u8 reg[1];
+		u8 value[1];
+
+		reg[0] = F020_SFR_P2;
+		value[0] = bits;
+		result = dt9812_write_multiple_registers(slot->usb, 1, reg,
+			value);
+		slot->usb->digital_out_shadow = bits;
+	}
+	up(&slot->mutex);
+	return result;
+}
+
+static int dt9812_digital_out_shadow(slot_dt9812_t * slot, u8 * bits)
+{
+	int result = -ENODEV;
+
+	down(&slot->mutex);
+	if (slot->usb) {
+		*bits = slot->usb->digital_out_shadow;
+		result = 0;
+	}
+	up(&slot->mutex);
+	return result;
+}
+
+static void dt9812_configure_mux(usb_dt9812_t * dev,
+	dt9812_rmw_byte_t * rmw, int channel)
+{
+	if (dev->device == DT9812_DEVID_DT9812_10) {
+		// In the DT9812/10V MUX is selected by P1.5-7
+		rmw->address = F020_SFR_P1;
+		rmw->and_mask = 0xe0;
+		rmw->or_value = channel << 5;
+	} else {
+		// In the DT9812/2.5V, the internal mux is selected by bits 0:2
+		rmw->address = F020_SFR_AMX0SL;
+		rmw->and_mask = 0xff;
+		rmw->or_value = channel & 0x07;
+	}
+}
+
+static void dt9812_configure_gain(usb_dt9812_t * dev,
+	dt9812_rmw_byte_t * rmw, dt9812_gain_t gain)
+{
+	if (dev->device == DT9812_DEVID_DT9812_10) {
+		// In the DT9812/10V, there is an external gain of 0.5
+		gain <<= 1;
+	}
+
+	rmw->address = F020_SFR_ADC0CF;
+	rmw->and_mask =
+		F020_MASK_ADC0CF_AMP0GN2 |
+		F020_MASK_ADC0CF_AMP0GN1 | F020_MASK_ADC0CF_AMP0GN0;
+	switch (gain) {
+		// 000 -> Gain =  1
+		// 001 -> Gain =  2
+		// 010 -> Gain =  4
+		// 011 -> Gain =  8
+		// 10x -> Gain = 16
+		// 11x -> Gain =  0.5
+	case DT9812_GAIN_0PT5:{
+			rmw->or_value = F020_MASK_ADC0CF_AMP0GN2
+				|| F020_MASK_ADC0CF_AMP0GN1;
+		}
+		break;
+	case DT9812_GAIN_1:{
+			rmw->or_value = 0x00;
+		}
+		break;
+	case DT9812_GAIN_2:{
+			rmw->or_value = F020_MASK_ADC0CF_AMP0GN0;
+		}
+		break;
+	case DT9812_GAIN_4:{
+			rmw->or_value = F020_MASK_ADC0CF_AMP0GN1;
+		}
+		break;
+	case DT9812_GAIN_8:{
+			rmw->or_value = F020_MASK_ADC0CF_AMP0GN1
+				|| F020_MASK_ADC0CF_AMP0GN0;
+		}
+		break;
+	case DT9812_GAIN_16:{
+			rmw->or_value = F020_MASK_ADC0CF_AMP0GN2;
+		}
+		break;
+	default:{
+			err("Illegal gain %d\n", gain);
+		}
+	}
+}
+
+static int dt9812_analog_in(slot_dt9812_t * slot,
+	int channel, u16 * value, dt9812_gain_t gain)
+{
+	int result = -ENODEV;
+
+	down(&slot->mutex);
+	if (slot->usb) {
+		dt9812_rmw_byte_t rmw[3];
+
+		// 1 select the gain
+		dt9812_configure_gain(slot->usb, &rmw[0], gain);
+
+		// 2 set the MUX to select the channel
+		dt9812_configure_mux(slot->usb, &rmw[1], channel);
+
+		// 3 start conversion
+		rmw[2].address = F020_SFR_ADC0CN;
+		rmw[2].and_mask = 0xff;
+		rmw[2].or_value =
+			F020_MASK_ADC0CN_AD0EN | F020_MASK_ADC0CN_AD0BUSY;
+
+		result = dt9812_rmw_multiple_registers(slot->usb, 3, rmw);
+		if (result == 0) {
+			// read the status and ADC
+			u8 reg[3] = { F020_SFR_ADC0CN, F020_SFR_ADC0H,
+				F020_SFR_ADC0L
+			};
+			u8 val[3];
+			result = dt9812_read_multiple_registers(slot->usb, 3,
+				reg, val);
+			if (result == 0) {
+				// An ADC conversion takes 16 SAR clocks cycles, i.e. about 9us.
+				// Therefore, between the instant that AD0BUSY was set via
+				// dt9812_rmw_multiple_registers and the read of AD0BUSY via
+				// dt9812_read_multiple_registers, the conversion
+				// should be complete since these two operations require two USB
+				// transactions each taking at least a millisecond to complete.
+				// However, lets make sure that conversion is finished.
+				if ((val[0] & (F020_MASK_ADC0CN_AD0INT |
+							F020_MASK_ADC0CN_AD0BUSY))
+					== F020_MASK_ADC0CN_AD0INT) {
+					switch (slot->usb->device) {
+					case DT9812_DEVID_DT9812_10:{
+							// For DT9812-10V the personality module set the encoding to 2's
+							// complement. Hence, convert it before returning it
+							*value = ((val[1] << 8)
+								| val[2]) +
+								0x800;
+						}
+						break;
+					case DT9812_DEVID_DT9812_2PT5:{
+							*value = (val[1] << 8) |
+								val[2];
+						}
+						break;
+					}
+				}
+			}
+		}
+	}
+	up(&slot->mutex);
+	return result;
+}
+
+static int dt9812_analog_out_shadow(slot_dt9812_t * slot, int channel,
+	u16 * value)
+{
+	int result = -ENODEV;
+
+	down(&slot->mutex);
+	if (slot->usb) {
+		*value = slot->usb->analog_out_shadow[channel];
+		result = 0;
+	}
+	up(&slot->mutex);
+
+	return result;
+}
+
+static int dt9812_analog_out(slot_dt9812_t * slot, int channel, u16 value)
+{
+	int result = -ENODEV;
+
+	down(&slot->mutex);
+	if (slot->usb) {
+		dt9812_rmw_byte_t rmw[3];
+
+		switch (channel) {
+		case 0:{
+				// 1. Set DAC mode
+				rmw[0].address = F020_SFR_DAC0CN;
+				rmw[0].and_mask = 0xff;
+				rmw[0].or_value = F020_MASK_DACxCN_DACxEN;
+
+				// 2 load low byte of DAC value first
+				rmw[1].address = F020_SFR_DAC0L;
+				rmw[1].and_mask = 0xff;
+				rmw[1].or_value = value & 0xff;
+
+				// 3 load high byte of DAC value next to latch the 12-bit value
+				rmw[2].address = F020_SFR_DAC0H;
+				rmw[2].and_mask = 0xff;
+				rmw[2].or_value = (value >> 8) & 0xf;
+			}
+			break;
+		case 1:{
+				// 1. Set DAC mode
+				rmw[0].address = F020_SFR_DAC1CN;
+				rmw[0].and_mask = 0xff;
+				rmw[0].or_value = F020_MASK_DACxCN_DACxEN;
+
+				// 2 load low byte of DAC value first
+				rmw[1].address = F020_SFR_DAC1L;
+				rmw[1].and_mask = 0xff;
+				rmw[1].or_value = value & 0xff;
+
+				// 3 load high byte of DAC value next to latch the 12-bit value
+				rmw[2].address = F020_SFR_DAC1H;
+				rmw[2].and_mask = 0xff;
+				rmw[2].or_value = (value >> 8) & 0xf;
+			}
+			break;
+		}
+		result = dt9812_rmw_multiple_registers(slot->usb, 3, rmw);
+		slot->usb->analog_out_shadow[channel] = value;
+	}
+	up(&slot->mutex);
+
+	return result;
+}
+
+/*
+ * USB framework functions
+ */
+
+static int dt9812_probe(struct usb_interface *interface,
+	const struct usb_device_id *id)
+{
+	int retval = -ENOMEM;
+	usb_dt9812_t *dev = NULL;
+	struct usb_host_interface *iface_desc;
+	struct usb_endpoint_descriptor *endpoint;
+	int i;
+	u8 fw;
+
+	// allocate memory for our device state and initialize it
+	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+	if (dev == NULL) {
+		err("Out of memory");
+		goto error;
+	}
+	kref_init(&dev->kref);
+
+	dev->udev = usb_get_dev(interface_to_usbdev(interface));
+	dev->interface = interface;
+
+	// Check endpoints
+	iface_desc = interface->cur_altsetting;
+
+	if (iface_desc->desc.bNumEndpoints != 5) {
+		err("Wrong number of endpints.");
+		retval = -ENODEV;
+		goto error;
+	}
+
+	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
+		int direction = -1;
+		endpoint = &iface_desc->endpoint[i].desc;
+		switch (i) {
+		case 0:{
+				direction = USB_DIR_IN;
+				dev->message_pipe.addr =
+					endpoint->bEndpointAddress;
+				dev->message_pipe.size =
+					le16_to_cpu(endpoint->wMaxPacketSize);
+			}
+			break;
+		case 1:{
+				direction = USB_DIR_OUT;
+				dev->command_write.addr =
+					endpoint->bEndpointAddress;
+				dev->command_write.size =
+					le16_to_cpu(endpoint->wMaxPacketSize);
+			}
+			break;
+		case 2:{
+				direction = USB_DIR_IN;
+				dev->command_read.addr =
+					endpoint->bEndpointAddress;
+				dev->command_read.size =
+					le16_to_cpu(endpoint->wMaxPacketSize);
+			}
+			break;
+		case 3:{
+				direction = USB_DIR_OUT;
+				dev->write_stream.addr =
+					endpoint->bEndpointAddress;
+				dev->write_stream.size =
+					le16_to_cpu(endpoint->wMaxPacketSize);
+			}
+			break;
+		case 4:{
+				direction = USB_DIR_IN;
+				dev->read_stream.addr =
+					endpoint->bEndpointAddress;
+				dev->read_stream.size =
+					le16_to_cpu(endpoint->wMaxPacketSize);
+			}
+			break;
+		}
+		if ((endpoint->bEndpointAddress & USB_DIR_IN) != direction) {
+			err("Endpoint has wrong direction.");
+			retval = -ENODEV;
+			goto error;
+		}
+	}
+	if (dt9812_read_info(dev, 0, &fw, sizeof(fw)) != 0) {
+		// Seems like a configuration reset is necessary if driver
+		// is reloaded while device is attached
+		int i;
+
+		usb_reset_configuration(dev->udev);
+		for (i = 0; i < 10; i++) {
+			retval = dt9812_read_info(dev, 1, &fw, sizeof(fw));
+			if (retval == 0) {
+				printk("usb_reset_configuration succeded after %d iterations\n", i);
+				break;
+			}
+		}
+	}
+
+	if (dt9812_read_info(dev, 1, &dev->vendor, sizeof(dev->vendor)) != 0) {
+		err("Failed to read vendor.");
+		retval = -ENODEV;
+		goto error;
+	}
+	if (dt9812_read_info(dev, 3, &dev->product, sizeof(dev->product)) != 0) {
+		err("Failed to read product.");
+		retval = -ENODEV;
+		goto error;
+	}
+	if (dt9812_read_info(dev, 5, &dev->device, sizeof(dev->device)) != 0) {
+		err("Failed to read device.");
+		retval = -ENODEV;
+		goto error;
+	}
+	if (dt9812_read_info(dev, 7, &dev->serial, sizeof(dev->serial)) != 0) {
+		err("Failed to read serial.");
+		retval = -ENODEV;
+		goto error;
+	}
+
+	dev->vendor = le16_to_cpu(dev->vendor);
+	dev->product = le16_to_cpu(dev->product);
+	dev->device = le16_to_cpu(dev->device);
+	dev->serial = le32_to_cpu(dev->serial);
+	switch (dev->device) {
+	case DT9812_DEVID_DT9812_10:{
+			dev->analog_out_shadow[0] = 0x0800;
+			dev->analog_out_shadow[1] = 0x800;
+		}
+		break;
+	case DT9812_DEVID_DT9812_2PT5:{
+			dev->analog_out_shadow[0] = 0x0000;
+			dev->analog_out_shadow[1] = 0x0000;
+		}
+		break;
+	}
+	dev->digital_out_shadow = 0;
+
+	// save our data pointer in this interface device a
+	usb_set_intfdata(interface, dev);
+
+	// let the user know what node this device is now attached to
+	dev_info(&interface->dev, "USB DT9812 (%4.4x.%4.4x.%4.4x) #0x%8.8x\n",
+		 dev->vendor, dev->product, dev->device, dev->serial);
+
+	down(&dt9812_mutex);
+	{
+		// Find a slot for the USB device
+		slot_dt9812_t *first = NULL;
+		slot_dt9812_t *best = NULL;
+
+		for (i = 0; i < DT9812_NUM_SLOTS; i++) {
+			if (!first && !dt9812[i].usb && dt9812[i].serial == 0) {
+				first = &dt9812[i];
+			}
+			if (!best && dt9812[i].serial == dev->serial) {
+				best = &dt9812[i];
+			}
+		}
+
+		if (!best) {
+			best = first;
+		}
+
+		if (best) {
+			down(&best->mutex);
+			best->usb = dev;
+			dev->slot = best;
+			up(&best->mutex);
+		}
+	}
+	up(&dt9812_mutex);
+
+	return 0;
+
+      error:
+	if (dev) {
+		kref_put(&dev->kref, dt9812_delete);
+	}
+	return retval;
+}
+
+static void dt9812_disconnect(struct usb_interface *interface)
+{
+	usb_dt9812_t *dev;
+	int minor = interface->minor;
+
+	down(&dt9812_mutex);
+	dev = usb_get_intfdata(interface);
+	if (dev->slot) {
+		down(&dev->slot->mutex);
+		dev->slot->usb = NULL;
+		up(&dev->slot->mutex);
+		dev->slot = NULL;
+	}
+	usb_set_intfdata(interface, NULL);
+	up(&dt9812_mutex);
+
+	/* queue final destruction */
+	kref_put(&dev->kref, dt9812_delete);
+
+	dev_info(&interface->dev, "USB Dt9812 #%d now disconnected\n", minor);
+}
+
+static struct usb_driver dt9812_usb_driver = {
+#ifdef COMEDI_HAVE_USB_DRIVER_OWNER
+	.owner = THIS_MODULE,
+#endif
+	.name = "dt9812",
+	.probe = dt9812_probe,
+	.disconnect = dt9812_disconnect,
+	.id_table = dt9812_table,
+};
+
+/*
+ * Comedi functions
+ */
+
+static void dt9812_comedi_open(comedi_device * dev)
+{
+	down(&devpriv->slot->mutex);
+	if (devpriv->slot->usb) {
+		// We have an attached device, fill in current range info
+		comedi_subdevice *s;
+
+		s = &dev->subdevices[0];
+		s->n_chan = 8;
+		s->maxdata = 1;
+
+		s = &dev->subdevices[1];
+		s->n_chan = 8;
+		s->maxdata = 1;
+
+		s = &dev->subdevices[2];
+		s->n_chan = 8;
+		switch (devpriv->slot->usb->device) {
+		case 0:{
+				s->maxdata = 4095;
+				s->range_table = &dt9812_10_ain_range;
+			}
+			break;
+		case 1:{
+				s->maxdata = 4095;
+				s->range_table = &dt9812_2pt5_ain_range;
+			}
+			break;
+		}
+
+		s = &dev->subdevices[3];
+		s->n_chan = 2;
+		switch (devpriv->slot->usb->device) {
+		case 0:{
+				s->maxdata = 4095;
+				s->range_table = &dt9812_10_aout_range;
+			}
+			break;
+		case 1:{
+				s->maxdata = 4095;
+				s->range_table = &dt9812_2pt5_aout_range;
+			}
+			break;
+		}
+	}
+	up(&devpriv->slot->mutex);
+}
+
+static int dt9812_di_rinsn(comedi_device * dev, comedi_subdevice * s,
+	comedi_insn * insn, lsampl_t * data)
+{
+	int n;
+	u8 bits = 0;
+
+	dt9812_digital_in(devpriv->slot, &bits);
+	for (n = 0; n < insn->n; n++) {
+		data[n] = ((1 << insn->chanspec) & bits) != 0;
+	}
+	return n;
+}
+
+static int dt9812_do_winsn(comedi_device * dev, comedi_subdevice * s,
+	comedi_insn * insn, lsampl_t * data)
+{
+	int n;
+	u8 bits = 0;
+
+	dt9812_digital_out_shadow(devpriv->slot, &bits);
+	for (n = 0; n < insn->n; n++) {
+		u8 mask = 1 << insn->chanspec;
+
+		bits &= ~mask;
+		if (data[n]) {
+			bits |= mask;
+		}
+	}
+	dt9812_digital_out(devpriv->slot, bits);
+	return n;
+}
+
+static int dt9812_ai_rinsn(comedi_device * dev, comedi_subdevice * s,
+	comedi_insn * insn, lsampl_t * data)
+{
+	int n;
+
+	for (n = 0; n < insn->n; n++) {
+		u16 value = 0;
+
+		dt9812_analog_in(devpriv->slot, insn->chanspec, &value,
+			DT9812_GAIN_1);
+		data[n] = value;
+	}
+	return n;
+}
+
+static int dt9812_ao_rinsn(comedi_device * dev, comedi_subdevice * s,
+	comedi_insn * insn, lsampl_t * data)
+{
+	int n;
+
+	for (n = 0; n < insn->n; n++) {
+		u16 value = 0;
+
+		dt9812_analog_out_shadow(devpriv->slot, insn->chanspec, &value);
+		data[n] = value;
+	}
+	return n;
+}
+
+static int dt9812_ao_winsn(comedi_device * dev, comedi_subdevice * s,
+	comedi_insn * insn, lsampl_t * data)
+{
+	int n;
+
+	for (n = 0; n < insn->n; n++) {
+		dt9812_analog_out(devpriv->slot, insn->chanspec, data[n]);
+	}
+	return n;
+}
+
+static int dt9812_attach(comedi_device * dev, comedi_devconfig * it)
+{
+	int i;
+	comedi_subdevice *s;
+
+	dev->board_name = "dt9812";
+
+	if (alloc_private(dev, sizeof(comedi_dt9812_t)) < 0) {
+		return -ENOMEM;
+	}
+	// Special open routine, since USB unit may be unattached at
+	// comedi_config time, hence range can not be determined
+	dev->open = dt9812_comedi_open;
+
+	devpriv->serial = it->options[0];
+
+	// Allocate subdevices
+	if (alloc_subdevices(dev, 4) < 0) {
+		return -ENOMEM;
+	}
+
+	/* digital input subdevice */
+	s = dev->subdevices + 0;
+	s->type = COMEDI_SUBD_DI;
+	s->subdev_flags = SDF_READABLE;
+	s->n_chan = 0;
+	s->maxdata = 1;
+	s->range_table = &range_digital;
+	s->insn_read = &dt9812_di_rinsn;
+
+	/* digital output subdevice */
+	s = dev->subdevices + 1;
+	s->type = COMEDI_SUBD_DO;
+	s->subdev_flags = SDF_WRITEABLE;
+	s->n_chan = 0;
+	s->maxdata = 1;
+	s->range_table = &range_digital;
+	s->insn_write = &dt9812_do_winsn;
+
+	/* analog input subdevice */
+	s = dev->subdevices + 2;
+	s->type = COMEDI_SUBD_AI;
+	s->subdev_flags = SDF_READABLE | SDF_GROUND;
+	s->n_chan = 0;
+	s->maxdata = 1;
+	s->range_table = 0;
+	s->insn_read = &dt9812_ai_rinsn;
+
+	/* analog output subdevice */
+	s = dev->subdevices + 3;
+	s->type = COMEDI_SUBD_AO;
+	s->subdev_flags = SDF_WRITEABLE;
+	s->n_chan = 0;
+	s->maxdata = 1;
+	s->range_table = 0;
+	s->insn_write = &dt9812_ao_winsn;
+	s->insn_read = &dt9812_ao_rinsn;
+
+	printk("comedi%d: successfully attached to dt9812.\n", dev->minor);
+
+	down(&dt9812_mutex);
+	// Find a slot for the comedi device
+	{
+		slot_dt9812_t *first = NULL;
+		slot_dt9812_t *best = NULL;
+		for (i = 0; i < DT9812_NUM_SLOTS; i++) {
+			if (!first && !dt9812[i].comedi) {
+				// First free slot from comedi side
+				first = &dt9812[i];
+			}
+			if (!best &&
+				dt9812[i].usb
+				&& dt9812[i].usb->serial == devpriv->serial) {
+				// We have an attaced device with matching ID
+				best = &dt9812[i];
+			}
+		}
+		if (!best) {
+			best = first;
+		}
+		if (best) {
+			down(&best->mutex);
+			best->comedi = devpriv;
+			best->serial = devpriv->serial;
+			devpriv->slot = best;
+			up(&best->mutex);
+		}
+	}
+	up(&dt9812_mutex);
+
+	return 0;
+}
+
+static int dt9812_detach(comedi_device * dev)
+{
+
+	return 0;
+}
+
+static comedi_driver dt9812_comedi_driver = {
+	.module = THIS_MODULE,
+	.driver_name = "dt9812",
+	.attach = dt9812_attach,
+	.detach = dt9812_detach,
+};
+
+static int __init usb_dt9812_init(void)
+{
+	int result, i;
+
+	// Initialize all driver slots
+	for (i = 0; i < DT9812_NUM_SLOTS; i++) {
+		init_MUTEX(&dt9812[i].mutex);
+		dt9812[i].serial = 0;
+		dt9812[i].usb = NULL;
+		dt9812[i].comedi = NULL;
+	}
+	dt9812[12].serial = 0x0;
+
+	// register with the USB subsystem
+	result = usb_register(&dt9812_usb_driver);
+	if (result) {
+		err("usb_register failed. Error number %d", result);
+	}
+	// register with comedi
+	result = comedi_driver_register(&dt9812_comedi_driver);
+	if (result) {
+		usb_deregister(&dt9812_usb_driver);
+		err("comedi_driver_register failed. Error number %d", result);
+	}
+
+	return result;
+}
+
+static void __exit usb_dt9812_exit(void)
+{
+	// unregister with comedi
+	comedi_driver_unregister(&dt9812_comedi_driver);
+
+	/* deregister this driver with the USB subsystem */
+	usb_deregister(&dt9812_usb_driver);
+}
+
+module_init(usb_dt9812_init);
+module_exit(usb_dt9812_exit);
+
+MODULE_AUTHOR("Anders Blomdell <anders.blomdell@control.lth.se>");
+MODULE_DESCRIPTION("Comedi DT9812 driver");
+MODULE_LICENSE("GPL");
+
+#endif // LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)

drivers/staging/comedi/drivers/dt9812.h

+#ifndef __DT9812_H__
+#define __DT9812_H__
+
+#define DT9812_DIAGS_BOARD_INFO_ADDR        0xFBFF
+#define DT9812_MAX_WRITE_CMD_PIPE_SIZE      32
+#define DT9812_MAX_READ_CMD_PIPE_SIZE       32
+
+/*
+ * See Silican Laboratories C8051F020/1/2/3 manual
+ */
+#define F020_SFR_P4                       0x84
+#define F020_SFR_P1                       0x90
+#define F020_SFR_P2                       0xa0
+#define F020_SFR_P3                       0xb0
+#define F020_SFR_AMX0CF                   0xba
+#define F020_SFR_AMX0SL                   0xbb
+#define F020_SFR_ADC0CF                   0xbc
+#define F020_SFR_ADC0L                    0xbe
+#define F020_SFR_ADC0H                    0xbf
+#define F020_SFR_DAC0L                    0xd2
+#define F020_SFR_DAC0H                    0xd3
+#define F020_SFR_DAC0CN                   0xd4
+#define F020_SFR_DAC1L                    0xd5
+#define F020_SFR_DAC1H                    0xd6
+#define F020_SFR_DAC1CN                   0xd7
+#define F020_SFR_ADC0CN                   0xe8
+
+#define F020_MASK_ADC0CF_AMP0GN0          0x01
+#define F020_MASK_ADC0CF_AMP0GN1          0x02
+#define F020_MASK_ADC0CF_AMP0GN2          0x04
+
+#define F020_MASK_ADC0CN_AD0EN            0x80
+#define F020_MASK_ADC0CN_AD0INT           0x20
+#define F020_MASK_ADC0CN_AD0BUSY          0x10
+
+#define F020_MASK_DACxCN_DACxEN           0x80
+
+typedef enum {			//                      A/D      D/A     DI   DO    CT
+	DT9812_DEVID_DT9812_10,	//    8        2       8    8     1   +/- 10V
+	DT9812_DEVID_DT9812_2PT5,	//    8        2       8    8     1   0-2.44V
+#if 0
+	DT9812_DEVID_DT9813,	//    16       2       4    4     1   +/- 10V
+	DT9812_DEVID_DT9814	//    24       2       0    0     1   +/- 10V
+#endif
+} dt9812_devid_t;
+
+typedef enum {
+	DT9812_GAIN_0PT25 = 1,
+	DT9812_GAIN_0PT5 = 2,
+	DT9812_GAIN_1 = 4,
+	DT9812_GAIN_2 = 8,
+	DT9812_GAIN_4 = 16,
+	DT9812_GAIN_8 = 32,
+	DT9812_GAIN_16 = 64,
+} dt9812_gain_t;
+
+typedef enum {
+	DT9812_LEAST_USB_FIRMWARE_CMD_CODE = 0,
+	DT9812_W_FLASH_DATA = 0,	// Write Flash memory
+	DT9812_R_FLASH_DATA = 1,	// Read Flash memory (misc config info)
+
+	// Register read/write commands for processor
+	DT9812_R_SINGLE_BYTE_REG = 2,	// Read a single byte of USB memory
+	DT9812_W_SINGLE_BYTE_REG = 3,	// Write a single byte of USB memory
+	DT9812_R_MULTI_BYTE_REG = 4,	// Multiple Reads of USB memory
+	DT9812_W_MULTI_BYTE_REG = 5,	// Multiple Writes of USB memory
+	DT9812_RMW_SINGLE_BYTE_REG = 6,	// Read, (AND) with mask, OR value,
+	// then write (single)
+	DT9812_RMW_MULTI_BYTE_REG = 7,	// Read, (AND) with mask, OR value,
+	// then write (multiple)
+
+	// Register read/write commands for SMBus
+	DT9812_R_SINGLE_BYTE_SMBUS = 8,	// Read a single byte of SMBus
+	DT9812_W_SINGLE_BYTE_SMBUS = 9,	// Write a single byte of SMBus
+	DT9812_R_MULTI_BYTE_SMBUS = 10,	// Multiple Reads of SMBus
+	DT9812_W_MULTI_BYTE_SMBUS = 11,	// Multiple Writes of SMBus
+
+	// Register read/write commands for a device
+	DT9812_R_SINGLE_BYTE_DEV = 12,	// Read a single byte of a device
+	DT9812_W_SINGLE_BYTE_DEV = 13,	// Write a single byte of a device
+	DT9812_R_MULTI_BYTE_DEV = 14,	// Multiple Reads of a device
+	DT9812_W_MULTI_BYTE_DEV = 15,	// Multiple Writes of a device
+
+	DT9812_W_DAC_THRESHOLD = 16,	// Not sure if we'll need this
+
+	DT9812_W_INT_ON_CHANGE_MASK = 17,	// Set interrupt on change mask
+
+	DT9812_W_CGL = 18,	// Write (or Clear) the CGL for the ADC
+	DT9812_R_MULTI_BYTE_USBMEM = 19,	// Multiple Reads of USB memory
+	DT9812_W_MULTI_BYTE_USBMEM = 20,	// Multiple Writes to USB memory
+
+	DT9812_START_SUBSYSTEM = 21,	// Issue a start command to a
+	// given subsystem
+	DT9812_STOP_SUBSYSTEM = 22,	// Issue a stop command to a
+	// given subsystem
+
+	DT9812_CALIBRATE_POT = 23,	//calibrate the board using CAL_POT_CMD
+	DT9812_W_DAC_FIFO_SIZE = 24,	// set the DAC FIFO size
+	DT9812_W_CGL_DAC = 25,	// Write (or Clear) the CGL for the DAC
+	DT9812_R_SINGLE_VALUE_CMD = 26,	// Read a single value from a subsystem
+	DT9812_W_SINGLE_VALUE_CMD = 27,	// Write a single value to a subsystem
+	DT9812_MAX_USB_FIRMWARE_CMD_CODE	// Valid DT9812_USB_FIRMWARE_CMD_CODE's
+		// will be less than this number
+} dt9812_usb_firmware_cmd_t;
+
+typedef struct {
+	u16 numbytes;
+	u16 address;
+} dt9812_flash_data_t;
+
+#define DT9812_MAX_NUM_MULTI_BYTE_RDS  \
+    ((DT9812_MAX_WRITE_CMD_PIPE_SIZE - 4 - 1) / sizeof(u8))
+
+typedef struct {
+	u8 count;
+	u8 address[DT9812_MAX_NUM_MULTI_BYTE_RDS];
+} dt9812_read_multi_t;
+
+typedef struct {
+	u8 address;
+	u8 value;
+} dt9812_write_byte_t;
+
+#define DT9812_MAX_NUM_MULTI_BYTE_WRTS  \
+    ((DT9812_MAX_WRITE_CMD_PIPE_SIZE - 4 - 1) / sizeof(dt9812_write_byte_t))
+
+typedef struct {
+	u8 count;
+	dt9812_write_byte_t write[DT9812_MAX_NUM_MULTI_BYTE_WRTS];
+} dt9812_write_multi_t;
+
+typedef struct {
+	u8 address;
+	u8 and_mask;
+	u8 or_value;
+} dt9812_rmw_byte_t;
+
+#define DT9812_MAX_NUM_MULTI_BYTE_RMWS  \
+    ((DT9812_MAX_WRITE_CMD_PIPE_SIZE - 4 - 1) / sizeof(dt9812_rmw_byte_t))
+
+typedef struct {
+	u8 count;
+	dt9812_rmw_byte_t rmw[DT9812_MAX_NUM_MULTI_BYTE_RMWS];
+} dt9812_rmw_multi_t;
+
+typedef struct dt9812_usb_cmd {
+
+	u32 cmd;
+	union {
+		dt9812_flash_data_t flash_data_info;
+		dt9812_read_multi_t read_multi_info;
+		dt9812_write_multi_t write_multi_info;
+		dt9812_rmw_multi_t rmw_multi_info;
+	} u;
+#if 0
+	WRITE_BYTE_INFO WriteByteInfo;
+	READ_BYTE_INFO ReadByteInfo;
+	WRITE_MULTI_INFO WriteMultiInfo;
+	READ_MULTI_INFO ReadMultiInfo;
+	RMW_BYTE_INFO RMWByteInfo;
+	RMW_MULTI_INFO RMWMultiInfo;
+	DAC_THRESHOLD_INFO DacThresholdInfo;
+	INT_ON_CHANGE_MASK_INFO IntOnChangeMaskInfo;
+	CGL_INFO CglInfo;
+	SUBSYSTEM_INFO SubsystemInfo;
+	CAL_POT_CMD CalPotCmd;
+	WRITE_DEV_BYTE_INFO WriteDevByteInfo;
+	READ_DEV_BYTE_INFO ReadDevByteInfo;
+	WRITE_DEV_MULTI_INFO WriteDevMultiInfo;
+	READ_DEV_MULTI_INFO ReadDevMultiInfo;
+	READ_SINGLE_VALUE_INFO ReadSingleValueInfo;
+	WRITE_SINGLE_VALUE_INFO WriteSingleValueInfo;
+#endif
+} dt9812_usb_cmd_t;
+
+#endif