2 * comedi/drivers/dt9812.c
3 * COMEDI driver for DataTranslation DT9812 USB module
5 * Copyright (C) 2005 Anders Blomdell <anders.blomdell@control.lth.se>
7 * COMEDI - Linux Control and Measurement Device Interface
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
22 * Description: Data Translation DT9812 USB module
23 * Devices: [Data Translation] DT9812 (dt9812)
24 * Author: anders.blomdell@control.lth.se (Anders Blomdell)
25 * Status: in development
26 * Updated: Sun Nov 20 20:18:34 EST 2005
28 * This driver works, but bulk transfers not implemented. Might be a
29 * starting point for someone else. I found out too late that USB has
30 * too high latencies (>1 ms) for my needs.
35 * 1. All writes to command pipe has to be 32 bytes (ISP1181B SHRTP=0 ?)
36 * 2. The DDK source (as of sep 2005) is in error regarding the
37 * input MUX bits (example code says P4, but firmware schematics
41 #include <linux/kernel.h>
42 #include <linux/module.h>
43 #include <linux/errno.h>
44 #include <linux/uaccess.h>
46 #include "../comedi_usb.h"
48 #define DT9812_DIAGS_BOARD_INFO_ADDR 0xFBFF
49 #define DT9812_MAX_WRITE_CMD_PIPE_SIZE 32
50 #define DT9812_MAX_READ_CMD_PIPE_SIZE 32
52 /* usb_bulk_msg() timout in milliseconds */
53 #define DT9812_USB_TIMEOUT 1000
56 * See Silican Laboratories C8051F020/1/2/3 manual
58 #define F020_SFR_P4 0x84
59 #define F020_SFR_P1 0x90
60 #define F020_SFR_P2 0xa0
61 #define F020_SFR_P3 0xb0
62 #define F020_SFR_AMX0CF 0xba
63 #define F020_SFR_AMX0SL 0xbb
64 #define F020_SFR_ADC0CF 0xbc
65 #define F020_SFR_ADC0L 0xbe
66 #define F020_SFR_ADC0H 0xbf
67 #define F020_SFR_DAC0L 0xd2
68 #define F020_SFR_DAC0H 0xd3
69 #define F020_SFR_DAC0CN 0xd4
70 #define F020_SFR_DAC1L 0xd5
71 #define F020_SFR_DAC1H 0xd6
72 #define F020_SFR_DAC1CN 0xd7
73 #define F020_SFR_ADC0CN 0xe8
75 #define F020_MASK_ADC0CF_AMP0GN0 0x01
76 #define F020_MASK_ADC0CF_AMP0GN1 0x02
77 #define F020_MASK_ADC0CF_AMP0GN2 0x04
79 #define F020_MASK_ADC0CN_AD0EN 0x80
80 #define F020_MASK_ADC0CN_AD0INT 0x20
81 #define F020_MASK_ADC0CN_AD0BUSY 0x10
83 #define F020_MASK_DACXCN_DACXEN 0x80
86 /* A/D D/A DI DO CT */
87 DT9812_DEVID_DT9812_10, /* 8 2 8 8 1 +/- 10V */
88 DT9812_DEVID_DT9812_2PT5, /* 8 2 8 8 1 0-2.44V */
92 DT9812_GAIN_0PT25 = 1,
102 DT9812_LEAST_USB_FIRMWARE_CMD_CODE = 0,
103 /* Write Flash memory */
104 DT9812_W_FLASH_DATA = 0,
105 /* Read Flash memory misc config info */
106 DT9812_R_FLASH_DATA = 1,
109 * Register read/write commands for processor
112 /* Read a single byte of USB memory */
113 DT9812_R_SINGLE_BYTE_REG = 2,
114 /* Write a single byte of USB memory */
115 DT9812_W_SINGLE_BYTE_REG = 3,
116 /* Multiple Reads of USB memory */
117 DT9812_R_MULTI_BYTE_REG = 4,
118 /* Multiple Writes of USB memory */
119 DT9812_W_MULTI_BYTE_REG = 5,
120 /* Read, (AND) with mask, OR value, then write (single) */
121 DT9812_RMW_SINGLE_BYTE_REG = 6,
122 /* Read, (AND) with mask, OR value, then write (multiple) */
123 DT9812_RMW_MULTI_BYTE_REG = 7,
126 * Register read/write commands for SMBus
129 /* Read a single byte of SMBus */
130 DT9812_R_SINGLE_BYTE_SMBUS = 8,
131 /* Write a single byte of SMBus */
132 DT9812_W_SINGLE_BYTE_SMBUS = 9,
133 /* Multiple Reads of SMBus */
134 DT9812_R_MULTI_BYTE_SMBUS = 10,
135 /* Multiple Writes of SMBus */
136 DT9812_W_MULTI_BYTE_SMBUS = 11,
139 * Register read/write commands for a device
142 /* Read a single byte of a device */
143 DT9812_R_SINGLE_BYTE_DEV = 12,
144 /* Write a single byte of a device */
145 DT9812_W_SINGLE_BYTE_DEV = 13,
146 /* Multiple Reads of a device */
147 DT9812_R_MULTI_BYTE_DEV = 14,
148 /* Multiple Writes of a device */
149 DT9812_W_MULTI_BYTE_DEV = 15,
151 /* Not sure if we'll need this */
152 DT9812_W_DAC_THRESHOLD = 16,
154 /* Set interrupt on change mask */
155 DT9812_W_INT_ON_CHANGE_MASK = 17,
157 /* Write (or Clear) the CGL for the ADC */
159 /* Multiple Reads of USB memory */
160 DT9812_R_MULTI_BYTE_USBMEM = 19,
161 /* Multiple Writes to USB memory */
162 DT9812_W_MULTI_BYTE_USBMEM = 20,
164 /* Issue a start command to a given subsystem */
165 DT9812_START_SUBSYSTEM = 21,
166 /* Issue a stop command to a given subsystem */
167 DT9812_STOP_SUBSYSTEM = 22,
169 /* calibrate the board using CAL_POT_CMD */
170 DT9812_CALIBRATE_POT = 23,
171 /* set the DAC FIFO size */
172 DT9812_W_DAC_FIFO_SIZE = 24,
173 /* Write or Clear the CGL for the DAC */
174 DT9812_W_CGL_DAC = 25,
175 /* Read a single value from a subsystem */
176 DT9812_R_SINGLE_VALUE_CMD = 26,
177 /* Write a single value to a subsystem */
178 DT9812_W_SINGLE_VALUE_CMD = 27,
179 /* Valid DT9812_USB_FIRMWARE_CMD_CODE's will be less than this number */
180 DT9812_MAX_USB_FIRMWARE_CMD_CODE,
183 struct dt9812_flash_data {
188 #define DT9812_MAX_NUM_MULTI_BYTE_RDS \
189 ((DT9812_MAX_WRITE_CMD_PIPE_SIZE - 4 - 1) / sizeof(u8))
191 struct dt9812_read_multi {
193 u8 address[DT9812_MAX_NUM_MULTI_BYTE_RDS];
196 struct dt9812_write_byte {
201 #define DT9812_MAX_NUM_MULTI_BYTE_WRTS \
202 ((DT9812_MAX_WRITE_CMD_PIPE_SIZE - 4 - 1) / \
203 sizeof(struct dt9812_write_byte))
205 struct dt9812_write_multi {
207 struct dt9812_write_byte write[DT9812_MAX_NUM_MULTI_BYTE_WRTS];
210 struct dt9812_rmw_byte {
216 #define DT9812_MAX_NUM_MULTI_BYTE_RMWS \
217 ((DT9812_MAX_WRITE_CMD_PIPE_SIZE - 4 - 1) / \
218 sizeof(struct dt9812_rmw_byte))
220 struct dt9812_rmw_multi {
222 struct dt9812_rmw_byte rmw[DT9812_MAX_NUM_MULTI_BYTE_RMWS];
225 struct dt9812_usb_cmd {
228 struct dt9812_flash_data flash_data_info;
229 struct dt9812_read_multi read_multi_info;
230 struct dt9812_write_multi write_multi_info;
231 struct dt9812_rmw_multi rmw_multi_info;
235 struct dt9812_private {
244 static int dt9812_read_info(struct comedi_device *dev,
245 int offset, void *buf, size_t buf_size)
247 struct usb_device *usb = comedi_to_usb_dev(dev);
248 struct dt9812_private *devpriv = dev->private;
249 struct dt9812_usb_cmd cmd;
252 cmd.cmd = cpu_to_le32(DT9812_R_FLASH_DATA);
253 cmd.u.flash_data_info.address =
254 cpu_to_le16(DT9812_DIAGS_BOARD_INFO_ADDR + offset);
255 cmd.u.flash_data_info.numbytes = cpu_to_le16(buf_size);
257 /* DT9812 only responds to 32 byte writes!! */
258 ret = usb_bulk_msg(usb, usb_sndbulkpipe(usb, devpriv->cmd_wr.addr),
259 &cmd, 32, &count, DT9812_USB_TIMEOUT);
263 return usb_bulk_msg(usb, usb_rcvbulkpipe(usb, devpriv->cmd_rd.addr),
264 buf, buf_size, &count, DT9812_USB_TIMEOUT);
267 static int dt9812_read_multiple_registers(struct comedi_device *dev,
268 int reg_count, u8 *address,
271 struct usb_device *usb = comedi_to_usb_dev(dev);
272 struct dt9812_private *devpriv = dev->private;
273 struct dt9812_usb_cmd cmd;
276 cmd.cmd = cpu_to_le32(DT9812_R_MULTI_BYTE_REG);
277 cmd.u.read_multi_info.count = reg_count;
278 for (i = 0; i < reg_count; i++)
279 cmd.u.read_multi_info.address[i] = address[i];
281 /* DT9812 only responds to 32 byte writes!! */
282 ret = usb_bulk_msg(usb, usb_sndbulkpipe(usb, devpriv->cmd_wr.addr),
283 &cmd, 32, &count, DT9812_USB_TIMEOUT);
287 return usb_bulk_msg(usb, usb_rcvbulkpipe(usb, devpriv->cmd_rd.addr),
288 value, reg_count, &count, DT9812_USB_TIMEOUT);
291 static int dt9812_write_multiple_registers(struct comedi_device *dev,
292 int reg_count, u8 *address,
295 struct usb_device *usb = comedi_to_usb_dev(dev);
296 struct dt9812_private *devpriv = dev->private;
297 struct dt9812_usb_cmd cmd;
300 cmd.cmd = cpu_to_le32(DT9812_W_MULTI_BYTE_REG);
301 cmd.u.read_multi_info.count = reg_count;
302 for (i = 0; i < reg_count; i++) {
303 cmd.u.write_multi_info.write[i].address = address[i];
304 cmd.u.write_multi_info.write[i].value = value[i];
307 /* DT9812 only responds to 32 byte writes!! */
308 return usb_bulk_msg(usb, usb_sndbulkpipe(usb, devpriv->cmd_wr.addr),
309 &cmd, 32, &count, DT9812_USB_TIMEOUT);
312 static int dt9812_rmw_multiple_registers(struct comedi_device *dev,
314 struct dt9812_rmw_byte *rmw)
316 struct usb_device *usb = comedi_to_usb_dev(dev);
317 struct dt9812_private *devpriv = dev->private;
318 struct dt9812_usb_cmd cmd;
321 cmd.cmd = cpu_to_le32(DT9812_RMW_MULTI_BYTE_REG);
322 cmd.u.rmw_multi_info.count = reg_count;
323 for (i = 0; i < reg_count; i++)
324 cmd.u.rmw_multi_info.rmw[i] = rmw[i];
326 /* DT9812 only responds to 32 byte writes!! */
327 return usb_bulk_msg(usb, usb_sndbulkpipe(usb, devpriv->cmd_wr.addr),
328 &cmd, 32, &count, DT9812_USB_TIMEOUT);
331 static int dt9812_digital_in(struct comedi_device *dev, u8 *bits)
333 struct dt9812_private *devpriv = dev->private;
334 u8 reg[2] = { F020_SFR_P3, F020_SFR_P1 };
338 mutex_lock(&devpriv->mut);
339 ret = dt9812_read_multiple_registers(dev, 2, reg, value);
342 * bits 0-6 in F020_SFR_P3 are bits 0-6 in the digital
343 * input port bit 3 in F020_SFR_P1 is bit 7 in the
346 *bits = (value[0] & 0x7f) | ((value[1] & 0x08) << 4);
348 mutex_unlock(&devpriv->mut);
353 static int dt9812_digital_out(struct comedi_device *dev, u8 bits)
355 struct dt9812_private *devpriv = dev->private;
356 u8 reg[1] = { F020_SFR_P2 };
357 u8 value[1] = { bits };
360 mutex_lock(&devpriv->mut);
361 ret = dt9812_write_multiple_registers(dev, 1, reg, value);
362 mutex_unlock(&devpriv->mut);
367 static void dt9812_configure_mux(struct comedi_device *dev,
368 struct dt9812_rmw_byte *rmw, int channel)
370 struct dt9812_private *devpriv = dev->private;
372 if (devpriv->device == DT9812_DEVID_DT9812_10) {
373 /* In the DT9812/10V MUX is selected by P1.5-7 */
374 rmw->address = F020_SFR_P1;
375 rmw->and_mask = 0xe0;
376 rmw->or_value = channel << 5;
378 /* In the DT9812/2.5V, internal mux is selected by bits 0:2 */
379 rmw->address = F020_SFR_AMX0SL;
380 rmw->and_mask = 0xff;
381 rmw->or_value = channel & 0x07;
385 static void dt9812_configure_gain(struct comedi_device *dev,
386 struct dt9812_rmw_byte *rmw,
387 enum dt9812_gain gain)
389 struct dt9812_private *devpriv = dev->private;
391 /* In the DT9812/10V, there is an external gain of 0.5 */
392 if (devpriv->device == DT9812_DEVID_DT9812_10)
395 rmw->address = F020_SFR_ADC0CF;
396 rmw->and_mask = F020_MASK_ADC0CF_AMP0GN2 |
397 F020_MASK_ADC0CF_AMP0GN1 |
398 F020_MASK_ADC0CF_AMP0GN0;
409 case DT9812_GAIN_0PT5:
410 rmw->or_value = F020_MASK_ADC0CF_AMP0GN2 |
411 F020_MASK_ADC0CF_AMP0GN1;
414 /* this should never happen, just use a gain of 1 */
416 rmw->or_value = 0x00;
419 rmw->or_value = F020_MASK_ADC0CF_AMP0GN0;
422 rmw->or_value = F020_MASK_ADC0CF_AMP0GN1;
425 rmw->or_value = F020_MASK_ADC0CF_AMP0GN1 |
426 F020_MASK_ADC0CF_AMP0GN0;
429 rmw->or_value = F020_MASK_ADC0CF_AMP0GN2;
434 static int dt9812_analog_in(struct comedi_device *dev,
435 int channel, u16 *value, enum dt9812_gain gain)
437 struct dt9812_private *devpriv = dev->private;
438 struct dt9812_rmw_byte rmw[3];
447 mutex_lock(&devpriv->mut);
449 /* 1 select the gain */
450 dt9812_configure_gain(dev, &rmw[0], gain);
452 /* 2 set the MUX to select the channel */
453 dt9812_configure_mux(dev, &rmw[1], channel);
455 /* 3 start conversion */
456 rmw[2].address = F020_SFR_ADC0CN;
457 rmw[2].and_mask = 0xff;
458 rmw[2].or_value = F020_MASK_ADC0CN_AD0EN | F020_MASK_ADC0CN_AD0BUSY;
460 ret = dt9812_rmw_multiple_registers(dev, 3, rmw);
464 /* read the status and ADC */
465 ret = dt9812_read_multiple_registers(dev, 3, reg, val);
470 * An ADC conversion takes 16 SAR clocks cycles, i.e. about 9us.
471 * Therefore, between the instant that AD0BUSY was set via
472 * dt9812_rmw_multiple_registers and the read of AD0BUSY via
473 * dt9812_read_multiple_registers, the conversion should be complete
474 * since these two operations require two USB transactions each taking
475 * at least a millisecond to complete. However, lets make sure that
476 * conversion is finished.
478 if ((val[0] & (F020_MASK_ADC0CN_AD0INT | F020_MASK_ADC0CN_AD0BUSY)) ==
479 F020_MASK_ADC0CN_AD0INT) {
480 switch (devpriv->device) {
481 case DT9812_DEVID_DT9812_10:
483 * For DT9812-10V the personality module set the
484 * encoding to 2's complement. Hence, convert it before
487 *value = ((val[1] << 8) | val[2]) + 0x800;
489 case DT9812_DEVID_DT9812_2PT5:
490 *value = (val[1] << 8) | val[2];
496 mutex_unlock(&devpriv->mut);
501 static int dt9812_analog_out(struct comedi_device *dev, int channel, u16 value)
503 struct dt9812_private *devpriv = dev->private;
504 struct dt9812_rmw_byte rmw[3];
507 mutex_lock(&devpriv->mut);
511 /* 1. Set DAC mode */
512 rmw[0].address = F020_SFR_DAC0CN;
513 rmw[0].and_mask = 0xff;
514 rmw[0].or_value = F020_MASK_DACXCN_DACXEN;
516 /* 2. load lsb of DAC value first */
517 rmw[1].address = F020_SFR_DAC0L;
518 rmw[1].and_mask = 0xff;
519 rmw[1].or_value = value & 0xff;
521 /* 3. load msb of DAC value next to latch the 12-bit value */
522 rmw[2].address = F020_SFR_DAC0H;
523 rmw[2].and_mask = 0xff;
524 rmw[2].or_value = (value >> 8) & 0xf;
528 /* 1. Set DAC mode */
529 rmw[0].address = F020_SFR_DAC1CN;
530 rmw[0].and_mask = 0xff;
531 rmw[0].or_value = F020_MASK_DACXCN_DACXEN;
533 /* 2. load lsb of DAC value first */
534 rmw[1].address = F020_SFR_DAC1L;
535 rmw[1].and_mask = 0xff;
536 rmw[1].or_value = value & 0xff;
538 /* 3. load msb of DAC value next to latch the 12-bit value */
539 rmw[2].address = F020_SFR_DAC1H;
540 rmw[2].and_mask = 0xff;
541 rmw[2].or_value = (value >> 8) & 0xf;
544 ret = dt9812_rmw_multiple_registers(dev, 3, rmw);
546 mutex_unlock(&devpriv->mut);
551 static int dt9812_di_insn_bits(struct comedi_device *dev,
552 struct comedi_subdevice *s,
553 struct comedi_insn *insn,
559 ret = dt9812_digital_in(dev, &bits);
568 static int dt9812_do_insn_bits(struct comedi_device *dev,
569 struct comedi_subdevice *s,
570 struct comedi_insn *insn,
573 if (comedi_dio_update_state(s, data))
574 dt9812_digital_out(dev, s->state);
581 static int dt9812_ai_insn_read(struct comedi_device *dev,
582 struct comedi_subdevice *s,
583 struct comedi_insn *insn,
586 unsigned int chan = CR_CHAN(insn->chanspec);
591 for (i = 0; i < insn->n; i++) {
592 ret = dt9812_analog_in(dev, chan, &val, DT9812_GAIN_1);
601 static int dt9812_ao_insn_read(struct comedi_device *dev,
602 struct comedi_subdevice *s,
603 struct comedi_insn *insn,
606 struct dt9812_private *devpriv = dev->private;
609 mutex_lock(&devpriv->mut);
610 ret = comedi_readback_insn_read(dev, s, insn, data);
611 mutex_unlock(&devpriv->mut);
616 static int dt9812_ao_insn_write(struct comedi_device *dev,
617 struct comedi_subdevice *s,
618 struct comedi_insn *insn,
621 unsigned int chan = CR_CHAN(insn->chanspec);
624 for (i = 0; i < insn->n; i++) {
625 unsigned int val = data[i];
628 ret = dt9812_analog_out(dev, chan, val);
632 s->readback[chan] = val;
638 static int dt9812_find_endpoints(struct comedi_device *dev)
640 struct usb_interface *intf = comedi_to_usb_interface(dev);
641 struct usb_host_interface *host = intf->cur_altsetting;
642 struct dt9812_private *devpriv = dev->private;
643 struct usb_endpoint_descriptor *ep;
646 if (host->desc.bNumEndpoints != 5) {
647 dev_err(dev->class_dev, "Wrong number of endpoints\n");
651 for (i = 0; i < host->desc.bNumEndpoints; ++i) {
654 ep = &host->endpoint[i].desc;
657 /* unused message pipe */
662 devpriv->cmd_wr.addr = ep->bEndpointAddress;
663 devpriv->cmd_wr.size = le16_to_cpu(ep->wMaxPacketSize);
667 devpriv->cmd_rd.addr = ep->bEndpointAddress;
668 devpriv->cmd_rd.size = le16_to_cpu(ep->wMaxPacketSize);
671 /* unused write stream */
675 /* unused read stream */
679 if ((ep->bEndpointAddress & USB_DIR_IN) != dir) {
680 dev_err(dev->class_dev,
681 "Endpoint has wrong direction\n");
688 static int dt9812_reset_device(struct comedi_device *dev)
690 struct usb_device *usb = comedi_to_usb_dev(dev);
691 struct dt9812_private *devpriv = dev->private;
701 ret = dt9812_read_info(dev, 0, &tmp8, sizeof(tmp8));
704 * Seems like a configuration reset is necessary if driver is
705 * reloaded while device is attached
707 usb_reset_configuration(usb);
708 for (i = 0; i < 10; i++) {
709 ret = dt9812_read_info(dev, 1, &tmp8, sizeof(tmp8));
714 dev_err(dev->class_dev,
715 "unable to reset configuration\n");
720 ret = dt9812_read_info(dev, 1, &tmp16, sizeof(tmp16));
722 dev_err(dev->class_dev, "failed to read vendor id\n");
725 vendor = le16_to_cpu(tmp16);
727 ret = dt9812_read_info(dev, 3, &tmp16, sizeof(tmp16));
729 dev_err(dev->class_dev, "failed to read product id\n");
732 product = le16_to_cpu(tmp16);
734 ret = dt9812_read_info(dev, 5, &tmp16, sizeof(tmp16));
736 dev_err(dev->class_dev, "failed to read device id\n");
739 devpriv->device = le16_to_cpu(tmp16);
741 ret = dt9812_read_info(dev, 7, &tmp32, sizeof(tmp32));
743 dev_err(dev->class_dev, "failed to read serial number\n");
746 serial = le32_to_cpu(tmp32);
748 /* let the user know what node this device is now attached to */
749 dev_info(dev->class_dev, "USB DT9812 (%4.4x.%4.4x.%4.4x) #0x%8.8x\n",
750 vendor, product, devpriv->device, serial);
752 if (devpriv->device != DT9812_DEVID_DT9812_10 &&
753 devpriv->device != DT9812_DEVID_DT9812_2PT5) {
754 dev_err(dev->class_dev, "Unsupported device!\n");
761 static int dt9812_auto_attach(struct comedi_device *dev,
762 unsigned long context)
764 struct usb_interface *intf = comedi_to_usb_interface(dev);
765 struct dt9812_private *devpriv;
766 struct comedi_subdevice *s;
771 devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
775 mutex_init(&devpriv->mut);
776 usb_set_intfdata(intf, devpriv);
778 ret = dt9812_find_endpoints(dev);
782 ret = dt9812_reset_device(dev);
786 is_unipolar = (devpriv->device == DT9812_DEVID_DT9812_2PT5);
788 ret = comedi_alloc_subdevices(dev, 4);
792 /* Digital Input subdevice */
793 s = &dev->subdevices[0];
794 s->type = COMEDI_SUBD_DI;
795 s->subdev_flags = SDF_READABLE;
798 s->range_table = &range_digital;
799 s->insn_bits = dt9812_di_insn_bits;
801 /* Digital Output subdevice */
802 s = &dev->subdevices[1];
803 s->type = COMEDI_SUBD_DO;
804 s->subdev_flags = SDF_WRITABLE;
807 s->range_table = &range_digital;
808 s->insn_bits = dt9812_do_insn_bits;
810 /* Analog Input subdevice */
811 s = &dev->subdevices[2];
812 s->type = COMEDI_SUBD_AI;
813 s->subdev_flags = SDF_READABLE | SDF_GROUND;
816 s->range_table = is_unipolar ? &range_unipolar2_5 : &range_bipolar10;
817 s->insn_read = dt9812_ai_insn_read;
819 /* Analog Output subdevice */
820 s = &dev->subdevices[3];
821 s->type = COMEDI_SUBD_AO;
822 s->subdev_flags = SDF_WRITABLE;
825 s->range_table = is_unipolar ? &range_unipolar2_5 : &range_bipolar10;
826 s->insn_write = dt9812_ao_insn_write;
827 s->insn_read = dt9812_ao_insn_read;
829 ret = comedi_alloc_subdev_readback(s);
833 for (i = 0; i < s->n_chan; i++)
834 s->readback[i] = is_unipolar ? 0x0000 : 0x0800;
839 static void dt9812_detach(struct comedi_device *dev)
841 struct usb_interface *intf = comedi_to_usb_interface(dev);
842 struct dt9812_private *devpriv = dev->private;
847 mutex_lock(&devpriv->mut);
849 usb_set_intfdata(intf, NULL);
851 mutex_unlock(&devpriv->mut);
854 static struct comedi_driver dt9812_driver = {
855 .driver_name = "dt9812",
856 .module = THIS_MODULE,
857 .auto_attach = dt9812_auto_attach,
858 .detach = dt9812_detach,
861 static int dt9812_usb_probe(struct usb_interface *intf,
862 const struct usb_device_id *id)
864 return comedi_usb_auto_config(intf, &dt9812_driver, id->driver_info);
867 static const struct usb_device_id dt9812_usb_table[] = {
868 { USB_DEVICE(0x0867, 0x9812) },
871 MODULE_DEVICE_TABLE(usb, dt9812_usb_table);
873 static struct usb_driver dt9812_usb_driver = {
875 .id_table = dt9812_usb_table,
876 .probe = dt9812_usb_probe,
877 .disconnect = comedi_usb_auto_unconfig,
879 module_comedi_usb_driver(dt9812_driver, dt9812_usb_driver);
881 MODULE_AUTHOR("Anders Blomdell <anders.blomdell@control.lth.se>");
882 MODULE_DESCRIPTION("Comedi DT9812 driver");
883 MODULE_LICENSE("GPL");