1 // SPDX-License-Identifier: GPL-2.0+
3 * comedi/drivers/dt9812.c
4 * COMEDI driver for DataTranslation DT9812 USB module
6 * Copyright (C) 2005 Anders Blomdell <anders.blomdell@control.lth.se>
8 * COMEDI - Linux Control and Measurement Device Interface
13 * Description: Data Translation DT9812 USB module
14 * Devices: [Data Translation] DT9812 (dt9812)
15 * Author: anders.blomdell@control.lth.se (Anders Blomdell)
16 * Status: in development
17 * Updated: Sun Nov 20 20:18:34 EST 2005
19 * This driver works, but bulk transfers not implemented. Might be a
20 * starting point for someone else. I found out too late that USB has
21 * too high latencies (>1 ms) for my needs.
26 * 1. All writes to command pipe has to be 32 bytes (ISP1181B SHRTP=0 ?)
27 * 2. The DDK source (as of sep 2005) is in error regarding the
28 * input MUX bits (example code says P4, but firmware schematics
32 #include <linux/kernel.h>
33 #include <linux/module.h>
34 #include <linux/errno.h>
35 #include <linux/uaccess.h>
37 #include "../comedi_usb.h"
39 #define DT9812_DIAGS_BOARD_INFO_ADDR 0xFBFF
40 #define DT9812_MAX_WRITE_CMD_PIPE_SIZE 32
41 #define DT9812_MAX_READ_CMD_PIPE_SIZE 32
43 /* usb_bulk_msg() timeout in milliseconds */
44 #define DT9812_USB_TIMEOUT 1000
47 * See Silican Laboratories C8051F020/1/2/3 manual
49 #define F020_SFR_P4 0x84
50 #define F020_SFR_P1 0x90
51 #define F020_SFR_P2 0xa0
52 #define F020_SFR_P3 0xb0
53 #define F020_SFR_AMX0CF 0xba
54 #define F020_SFR_AMX0SL 0xbb
55 #define F020_SFR_ADC0CF 0xbc
56 #define F020_SFR_ADC0L 0xbe
57 #define F020_SFR_ADC0H 0xbf
58 #define F020_SFR_DAC0L 0xd2
59 #define F020_SFR_DAC0H 0xd3
60 #define F020_SFR_DAC0CN 0xd4
61 #define F020_SFR_DAC1L 0xd5
62 #define F020_SFR_DAC1H 0xd6
63 #define F020_SFR_DAC1CN 0xd7
64 #define F020_SFR_ADC0CN 0xe8
66 #define F020_MASK_ADC0CF_AMP0GN0 0x01
67 #define F020_MASK_ADC0CF_AMP0GN1 0x02
68 #define F020_MASK_ADC0CF_AMP0GN2 0x04
70 #define F020_MASK_ADC0CN_AD0EN 0x80
71 #define F020_MASK_ADC0CN_AD0INT 0x20
72 #define F020_MASK_ADC0CN_AD0BUSY 0x10
74 #define F020_MASK_DACXCN_DACXEN 0x80
77 /* A/D D/A DI DO CT */
78 DT9812_DEVID_DT9812_10, /* 8 2 8 8 1 +/- 10V */
79 DT9812_DEVID_DT9812_2PT5, /* 8 2 8 8 1 0-2.44V */
83 DT9812_GAIN_0PT25 = 1,
93 DT9812_LEAST_USB_FIRMWARE_CMD_CODE = 0,
94 /* Write Flash memory */
95 DT9812_W_FLASH_DATA = 0,
96 /* Read Flash memory misc config info */
97 DT9812_R_FLASH_DATA = 1,
100 * Register read/write commands for processor
103 /* Read a single byte of USB memory */
104 DT9812_R_SINGLE_BYTE_REG = 2,
105 /* Write a single byte of USB memory */
106 DT9812_W_SINGLE_BYTE_REG = 3,
107 /* Multiple Reads of USB memory */
108 DT9812_R_MULTI_BYTE_REG = 4,
109 /* Multiple Writes of USB memory */
110 DT9812_W_MULTI_BYTE_REG = 5,
111 /* Read, (AND) with mask, OR value, then write (single) */
112 DT9812_RMW_SINGLE_BYTE_REG = 6,
113 /* Read, (AND) with mask, OR value, then write (multiple) */
114 DT9812_RMW_MULTI_BYTE_REG = 7,
117 * Register read/write commands for SMBus
120 /* Read a single byte of SMBus */
121 DT9812_R_SINGLE_BYTE_SMBUS = 8,
122 /* Write a single byte of SMBus */
123 DT9812_W_SINGLE_BYTE_SMBUS = 9,
124 /* Multiple Reads of SMBus */
125 DT9812_R_MULTI_BYTE_SMBUS = 10,
126 /* Multiple Writes of SMBus */
127 DT9812_W_MULTI_BYTE_SMBUS = 11,
130 * Register read/write commands for a device
133 /* Read a single byte of a device */
134 DT9812_R_SINGLE_BYTE_DEV = 12,
135 /* Write a single byte of a device */
136 DT9812_W_SINGLE_BYTE_DEV = 13,
137 /* Multiple Reads of a device */
138 DT9812_R_MULTI_BYTE_DEV = 14,
139 /* Multiple Writes of a device */
140 DT9812_W_MULTI_BYTE_DEV = 15,
142 /* Not sure if we'll need this */
143 DT9812_W_DAC_THRESHOLD = 16,
145 /* Set interrupt on change mask */
146 DT9812_W_INT_ON_CHANGE_MASK = 17,
148 /* Write (or Clear) the CGL for the ADC */
150 /* Multiple Reads of USB memory */
151 DT9812_R_MULTI_BYTE_USBMEM = 19,
152 /* Multiple Writes to USB memory */
153 DT9812_W_MULTI_BYTE_USBMEM = 20,
155 /* Issue a start command to a given subsystem */
156 DT9812_START_SUBSYSTEM = 21,
157 /* Issue a stop command to a given subsystem */
158 DT9812_STOP_SUBSYSTEM = 22,
160 /* calibrate the board using CAL_POT_CMD */
161 DT9812_CALIBRATE_POT = 23,
162 /* set the DAC FIFO size */
163 DT9812_W_DAC_FIFO_SIZE = 24,
164 /* Write or Clear the CGL for the DAC */
165 DT9812_W_CGL_DAC = 25,
166 /* Read a single value from a subsystem */
167 DT9812_R_SINGLE_VALUE_CMD = 26,
168 /* Write a single value to a subsystem */
169 DT9812_W_SINGLE_VALUE_CMD = 27,
170 /* Valid DT9812_USB_FIRMWARE_CMD_CODE's will be less than this number */
171 DT9812_MAX_USB_FIRMWARE_CMD_CODE,
174 struct dt9812_flash_data {
179 #define DT9812_MAX_NUM_MULTI_BYTE_RDS \
180 ((DT9812_MAX_WRITE_CMD_PIPE_SIZE - 4 - 1) / sizeof(u8))
182 struct dt9812_read_multi {
184 u8 address[DT9812_MAX_NUM_MULTI_BYTE_RDS];
187 struct dt9812_write_byte {
192 #define DT9812_MAX_NUM_MULTI_BYTE_WRTS \
193 ((DT9812_MAX_WRITE_CMD_PIPE_SIZE - 4 - 1) / \
194 sizeof(struct dt9812_write_byte))
196 struct dt9812_write_multi {
198 struct dt9812_write_byte write[DT9812_MAX_NUM_MULTI_BYTE_WRTS];
201 struct dt9812_rmw_byte {
207 #define DT9812_MAX_NUM_MULTI_BYTE_RMWS \
208 ((DT9812_MAX_WRITE_CMD_PIPE_SIZE - 4 - 1) / \
209 sizeof(struct dt9812_rmw_byte))
211 struct dt9812_rmw_multi {
213 struct dt9812_rmw_byte rmw[DT9812_MAX_NUM_MULTI_BYTE_RMWS];
216 struct dt9812_usb_cmd {
219 struct dt9812_flash_data flash_data_info;
220 struct dt9812_read_multi read_multi_info;
221 struct dt9812_write_multi write_multi_info;
222 struct dt9812_rmw_multi rmw_multi_info;
226 struct dt9812_private {
235 static int dt9812_read_info(struct comedi_device *dev,
236 int offset, void *buf, size_t buf_size)
238 struct usb_device *usb = comedi_to_usb_dev(dev);
239 struct dt9812_private *devpriv = dev->private;
240 struct dt9812_usb_cmd cmd;
243 cmd.cmd = cpu_to_le32(DT9812_R_FLASH_DATA);
244 cmd.u.flash_data_info.address =
245 cpu_to_le16(DT9812_DIAGS_BOARD_INFO_ADDR + offset);
246 cmd.u.flash_data_info.numbytes = cpu_to_le16(buf_size);
248 /* DT9812 only responds to 32 byte writes!! */
249 ret = usb_bulk_msg(usb, usb_sndbulkpipe(usb, devpriv->cmd_wr.addr),
250 &cmd, 32, &count, DT9812_USB_TIMEOUT);
254 return usb_bulk_msg(usb, usb_rcvbulkpipe(usb, devpriv->cmd_rd.addr),
255 buf, buf_size, &count, DT9812_USB_TIMEOUT);
258 static int dt9812_read_multiple_registers(struct comedi_device *dev,
259 int reg_count, u8 *address,
262 struct usb_device *usb = comedi_to_usb_dev(dev);
263 struct dt9812_private *devpriv = dev->private;
264 struct dt9812_usb_cmd cmd;
267 cmd.cmd = cpu_to_le32(DT9812_R_MULTI_BYTE_REG);
268 cmd.u.read_multi_info.count = reg_count;
269 for (i = 0; i < reg_count; i++)
270 cmd.u.read_multi_info.address[i] = address[i];
272 /* DT9812 only responds to 32 byte writes!! */
273 ret = usb_bulk_msg(usb, usb_sndbulkpipe(usb, devpriv->cmd_wr.addr),
274 &cmd, 32, &count, DT9812_USB_TIMEOUT);
278 return usb_bulk_msg(usb, usb_rcvbulkpipe(usb, devpriv->cmd_rd.addr),
279 value, reg_count, &count, DT9812_USB_TIMEOUT);
282 static int dt9812_write_multiple_registers(struct comedi_device *dev,
283 int reg_count, u8 *address,
286 struct usb_device *usb = comedi_to_usb_dev(dev);
287 struct dt9812_private *devpriv = dev->private;
288 struct dt9812_usb_cmd cmd;
291 cmd.cmd = cpu_to_le32(DT9812_W_MULTI_BYTE_REG);
292 cmd.u.read_multi_info.count = reg_count;
293 for (i = 0; i < reg_count; i++) {
294 cmd.u.write_multi_info.write[i].address = address[i];
295 cmd.u.write_multi_info.write[i].value = value[i];
298 /* DT9812 only responds to 32 byte writes!! */
299 return usb_bulk_msg(usb, usb_sndbulkpipe(usb, devpriv->cmd_wr.addr),
300 &cmd, 32, &count, DT9812_USB_TIMEOUT);
303 static int dt9812_rmw_multiple_registers(struct comedi_device *dev,
305 struct dt9812_rmw_byte *rmw)
307 struct usb_device *usb = comedi_to_usb_dev(dev);
308 struct dt9812_private *devpriv = dev->private;
309 struct dt9812_usb_cmd cmd;
312 cmd.cmd = cpu_to_le32(DT9812_RMW_MULTI_BYTE_REG);
313 cmd.u.rmw_multi_info.count = reg_count;
314 for (i = 0; i < reg_count; i++)
315 cmd.u.rmw_multi_info.rmw[i] = rmw[i];
317 /* DT9812 only responds to 32 byte writes!! */
318 return usb_bulk_msg(usb, usb_sndbulkpipe(usb, devpriv->cmd_wr.addr),
319 &cmd, 32, &count, DT9812_USB_TIMEOUT);
322 static int dt9812_digital_in(struct comedi_device *dev, u8 *bits)
324 struct dt9812_private *devpriv = dev->private;
325 u8 reg[2] = { F020_SFR_P3, F020_SFR_P1 };
329 mutex_lock(&devpriv->mut);
330 ret = dt9812_read_multiple_registers(dev, 2, reg, value);
333 * bits 0-6 in F020_SFR_P3 are bits 0-6 in the digital
334 * input port bit 3 in F020_SFR_P1 is bit 7 in the
337 *bits = (value[0] & 0x7f) | ((value[1] & 0x08) << 4);
339 mutex_unlock(&devpriv->mut);
344 static int dt9812_digital_out(struct comedi_device *dev, u8 bits)
346 struct dt9812_private *devpriv = dev->private;
347 u8 reg[1] = { F020_SFR_P2 };
348 u8 value[1] = { bits };
351 mutex_lock(&devpriv->mut);
352 ret = dt9812_write_multiple_registers(dev, 1, reg, value);
353 mutex_unlock(&devpriv->mut);
358 static void dt9812_configure_mux(struct comedi_device *dev,
359 struct dt9812_rmw_byte *rmw, int channel)
361 struct dt9812_private *devpriv = dev->private;
363 if (devpriv->device == DT9812_DEVID_DT9812_10) {
364 /* In the DT9812/10V MUX is selected by P1.5-7 */
365 rmw->address = F020_SFR_P1;
366 rmw->and_mask = 0xe0;
367 rmw->or_value = channel << 5;
369 /* In the DT9812/2.5V, internal mux is selected by bits 0:2 */
370 rmw->address = F020_SFR_AMX0SL;
371 rmw->and_mask = 0xff;
372 rmw->or_value = channel & 0x07;
376 static void dt9812_configure_gain(struct comedi_device *dev,
377 struct dt9812_rmw_byte *rmw,
378 enum dt9812_gain gain)
380 struct dt9812_private *devpriv = dev->private;
382 /* In the DT9812/10V, there is an external gain of 0.5 */
383 if (devpriv->device == DT9812_DEVID_DT9812_10)
386 rmw->address = F020_SFR_ADC0CF;
387 rmw->and_mask = F020_MASK_ADC0CF_AMP0GN2 |
388 F020_MASK_ADC0CF_AMP0GN1 |
389 F020_MASK_ADC0CF_AMP0GN0;
400 case DT9812_GAIN_0PT5:
401 rmw->or_value = F020_MASK_ADC0CF_AMP0GN2 |
402 F020_MASK_ADC0CF_AMP0GN1;
405 /* this should never happen, just use a gain of 1 */
407 rmw->or_value = 0x00;
410 rmw->or_value = F020_MASK_ADC0CF_AMP0GN0;
413 rmw->or_value = F020_MASK_ADC0CF_AMP0GN1;
416 rmw->or_value = F020_MASK_ADC0CF_AMP0GN1 |
417 F020_MASK_ADC0CF_AMP0GN0;
420 rmw->or_value = F020_MASK_ADC0CF_AMP0GN2;
425 static int dt9812_analog_in(struct comedi_device *dev,
426 int channel, u16 *value, enum dt9812_gain gain)
428 struct dt9812_private *devpriv = dev->private;
429 struct dt9812_rmw_byte rmw[3];
438 mutex_lock(&devpriv->mut);
440 /* 1 select the gain */
441 dt9812_configure_gain(dev, &rmw[0], gain);
443 /* 2 set the MUX to select the channel */
444 dt9812_configure_mux(dev, &rmw[1], channel);
446 /* 3 start conversion */
447 rmw[2].address = F020_SFR_ADC0CN;
448 rmw[2].and_mask = 0xff;
449 rmw[2].or_value = F020_MASK_ADC0CN_AD0EN | F020_MASK_ADC0CN_AD0BUSY;
451 ret = dt9812_rmw_multiple_registers(dev, 3, rmw);
455 /* read the status and ADC */
456 ret = dt9812_read_multiple_registers(dev, 3, reg, val);
461 * An ADC conversion takes 16 SAR clocks cycles, i.e. about 9us.
462 * Therefore, between the instant that AD0BUSY was set via
463 * dt9812_rmw_multiple_registers and the read of AD0BUSY via
464 * dt9812_read_multiple_registers, the conversion should be complete
465 * since these two operations require two USB transactions each taking
466 * at least a millisecond to complete. However, lets make sure that
467 * conversion is finished.
469 if ((val[0] & (F020_MASK_ADC0CN_AD0INT | F020_MASK_ADC0CN_AD0BUSY)) ==
470 F020_MASK_ADC0CN_AD0INT) {
471 switch (devpriv->device) {
472 case DT9812_DEVID_DT9812_10:
474 * For DT9812-10V the personality module set the
475 * encoding to 2's complement. Hence, convert it before
478 *value = ((val[1] << 8) | val[2]) + 0x800;
480 case DT9812_DEVID_DT9812_2PT5:
481 *value = (val[1] << 8) | val[2];
487 mutex_unlock(&devpriv->mut);
492 static int dt9812_analog_out(struct comedi_device *dev, int channel, u16 value)
494 struct dt9812_private *devpriv = dev->private;
495 struct dt9812_rmw_byte rmw[3];
498 mutex_lock(&devpriv->mut);
502 /* 1. Set DAC mode */
503 rmw[0].address = F020_SFR_DAC0CN;
504 rmw[0].and_mask = 0xff;
505 rmw[0].or_value = F020_MASK_DACXCN_DACXEN;
507 /* 2. load lsb of DAC value first */
508 rmw[1].address = F020_SFR_DAC0L;
509 rmw[1].and_mask = 0xff;
510 rmw[1].or_value = value & 0xff;
512 /* 3. load msb of DAC value next to latch the 12-bit value */
513 rmw[2].address = F020_SFR_DAC0H;
514 rmw[2].and_mask = 0xff;
515 rmw[2].or_value = (value >> 8) & 0xf;
519 /* 1. Set DAC mode */
520 rmw[0].address = F020_SFR_DAC1CN;
521 rmw[0].and_mask = 0xff;
522 rmw[0].or_value = F020_MASK_DACXCN_DACXEN;
524 /* 2. load lsb of DAC value first */
525 rmw[1].address = F020_SFR_DAC1L;
526 rmw[1].and_mask = 0xff;
527 rmw[1].or_value = value & 0xff;
529 /* 3. load msb of DAC value next to latch the 12-bit value */
530 rmw[2].address = F020_SFR_DAC1H;
531 rmw[2].and_mask = 0xff;
532 rmw[2].or_value = (value >> 8) & 0xf;
535 ret = dt9812_rmw_multiple_registers(dev, 3, rmw);
537 mutex_unlock(&devpriv->mut);
542 static int dt9812_di_insn_bits(struct comedi_device *dev,
543 struct comedi_subdevice *s,
544 struct comedi_insn *insn,
550 ret = dt9812_digital_in(dev, &bits);
559 static int dt9812_do_insn_bits(struct comedi_device *dev,
560 struct comedi_subdevice *s,
561 struct comedi_insn *insn,
564 if (comedi_dio_update_state(s, data))
565 dt9812_digital_out(dev, s->state);
572 static int dt9812_ai_insn_read(struct comedi_device *dev,
573 struct comedi_subdevice *s,
574 struct comedi_insn *insn,
577 unsigned int chan = CR_CHAN(insn->chanspec);
582 for (i = 0; i < insn->n; i++) {
583 ret = dt9812_analog_in(dev, chan, &val, DT9812_GAIN_1);
592 static int dt9812_ao_insn_read(struct comedi_device *dev,
593 struct comedi_subdevice *s,
594 struct comedi_insn *insn,
597 struct dt9812_private *devpriv = dev->private;
600 mutex_lock(&devpriv->mut);
601 ret = comedi_readback_insn_read(dev, s, insn, data);
602 mutex_unlock(&devpriv->mut);
607 static int dt9812_ao_insn_write(struct comedi_device *dev,
608 struct comedi_subdevice *s,
609 struct comedi_insn *insn,
612 unsigned int chan = CR_CHAN(insn->chanspec);
615 for (i = 0; i < insn->n; i++) {
616 unsigned int val = data[i];
619 ret = dt9812_analog_out(dev, chan, val);
623 s->readback[chan] = val;
629 static int dt9812_find_endpoints(struct comedi_device *dev)
631 struct usb_interface *intf = comedi_to_usb_interface(dev);
632 struct usb_host_interface *host = intf->cur_altsetting;
633 struct dt9812_private *devpriv = dev->private;
634 struct usb_endpoint_descriptor *ep;
637 if (host->desc.bNumEndpoints != 5) {
638 dev_err(dev->class_dev, "Wrong number of endpoints\n");
642 for (i = 0; i < host->desc.bNumEndpoints; ++i) {
645 ep = &host->endpoint[i].desc;
648 /* unused message pipe */
653 devpriv->cmd_wr.addr = ep->bEndpointAddress;
654 devpriv->cmd_wr.size = usb_endpoint_maxp(ep);
658 devpriv->cmd_rd.addr = ep->bEndpointAddress;
659 devpriv->cmd_rd.size = usb_endpoint_maxp(ep);
662 /* unused write stream */
666 /* unused read stream */
670 if ((ep->bEndpointAddress & USB_DIR_IN) != dir) {
671 dev_err(dev->class_dev,
672 "Endpoint has wrong direction\n");
679 static int dt9812_reset_device(struct comedi_device *dev)
681 struct usb_device *usb = comedi_to_usb_dev(dev);
682 struct dt9812_private *devpriv = dev->private;
692 ret = dt9812_read_info(dev, 0, &tmp8, sizeof(tmp8));
695 * Seems like a configuration reset is necessary if driver is
696 * reloaded while device is attached
698 usb_reset_configuration(usb);
699 for (i = 0; i < 10; i++) {
700 ret = dt9812_read_info(dev, 1, &tmp8, sizeof(tmp8));
705 dev_err(dev->class_dev,
706 "unable to reset configuration\n");
711 ret = dt9812_read_info(dev, 1, &tmp16, sizeof(tmp16));
713 dev_err(dev->class_dev, "failed to read vendor id\n");
716 vendor = le16_to_cpu(tmp16);
718 ret = dt9812_read_info(dev, 3, &tmp16, sizeof(tmp16));
720 dev_err(dev->class_dev, "failed to read product id\n");
723 product = le16_to_cpu(tmp16);
725 ret = dt9812_read_info(dev, 5, &tmp16, sizeof(tmp16));
727 dev_err(dev->class_dev, "failed to read device id\n");
730 devpriv->device = le16_to_cpu(tmp16);
732 ret = dt9812_read_info(dev, 7, &tmp32, sizeof(tmp32));
734 dev_err(dev->class_dev, "failed to read serial number\n");
737 serial = le32_to_cpu(tmp32);
739 /* let the user know what node this device is now attached to */
740 dev_info(dev->class_dev, "USB DT9812 (%4.4x.%4.4x.%4.4x) #0x%8.8x\n",
741 vendor, product, devpriv->device, serial);
743 if (devpriv->device != DT9812_DEVID_DT9812_10 &&
744 devpriv->device != DT9812_DEVID_DT9812_2PT5) {
745 dev_err(dev->class_dev, "Unsupported device!\n");
752 static int dt9812_auto_attach(struct comedi_device *dev,
753 unsigned long context)
755 struct usb_interface *intf = comedi_to_usb_interface(dev);
756 struct dt9812_private *devpriv;
757 struct comedi_subdevice *s;
762 devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
766 mutex_init(&devpriv->mut);
767 usb_set_intfdata(intf, devpriv);
769 ret = dt9812_find_endpoints(dev);
773 ret = dt9812_reset_device(dev);
777 is_unipolar = (devpriv->device == DT9812_DEVID_DT9812_2PT5);
779 ret = comedi_alloc_subdevices(dev, 4);
783 /* Digital Input subdevice */
784 s = &dev->subdevices[0];
785 s->type = COMEDI_SUBD_DI;
786 s->subdev_flags = SDF_READABLE;
789 s->range_table = &range_digital;
790 s->insn_bits = dt9812_di_insn_bits;
792 /* Digital Output subdevice */
793 s = &dev->subdevices[1];
794 s->type = COMEDI_SUBD_DO;
795 s->subdev_flags = SDF_WRITABLE;
798 s->range_table = &range_digital;
799 s->insn_bits = dt9812_do_insn_bits;
801 /* Analog Input subdevice */
802 s = &dev->subdevices[2];
803 s->type = COMEDI_SUBD_AI;
804 s->subdev_flags = SDF_READABLE | SDF_GROUND;
807 s->range_table = is_unipolar ? &range_unipolar2_5 : &range_bipolar10;
808 s->insn_read = dt9812_ai_insn_read;
810 /* Analog Output subdevice */
811 s = &dev->subdevices[3];
812 s->type = COMEDI_SUBD_AO;
813 s->subdev_flags = SDF_WRITABLE;
816 s->range_table = is_unipolar ? &range_unipolar2_5 : &range_bipolar10;
817 s->insn_write = dt9812_ao_insn_write;
818 s->insn_read = dt9812_ao_insn_read;
820 ret = comedi_alloc_subdev_readback(s);
824 for (i = 0; i < s->n_chan; i++)
825 s->readback[i] = is_unipolar ? 0x0000 : 0x0800;
830 static void dt9812_detach(struct comedi_device *dev)
832 struct usb_interface *intf = comedi_to_usb_interface(dev);
833 struct dt9812_private *devpriv = dev->private;
838 mutex_destroy(&devpriv->mut);
839 usb_set_intfdata(intf, NULL);
842 static struct comedi_driver dt9812_driver = {
843 .driver_name = "dt9812",
844 .module = THIS_MODULE,
845 .auto_attach = dt9812_auto_attach,
846 .detach = dt9812_detach,
849 static int dt9812_usb_probe(struct usb_interface *intf,
850 const struct usb_device_id *id)
852 return comedi_usb_auto_config(intf, &dt9812_driver, id->driver_info);
855 static const struct usb_device_id dt9812_usb_table[] = {
856 { USB_DEVICE(0x0867, 0x9812) },
859 MODULE_DEVICE_TABLE(usb, dt9812_usb_table);
861 static struct usb_driver dt9812_usb_driver = {
863 .id_table = dt9812_usb_table,
864 .probe = dt9812_usb_probe,
865 .disconnect = comedi_usb_auto_unconfig,
867 module_comedi_usb_driver(dt9812_driver, dt9812_usb_driver);
869 MODULE_AUTHOR("Anders Blomdell <anders.blomdell@control.lth.se>");
870 MODULE_DESCRIPTION("Comedi DT9812 driver");
871 MODULE_LICENSE("GPL");