// SPDX-License-Identifier: GPL-2.0+ /* * comedi/drivers/dt9812.c * COMEDI driver for DataTranslation DT9812 USB module * * Copyright (C) 2005 Anders Blomdell * * COMEDI - Linux Control and Measurement Device Interface */ /* * Driver: dt9812 * Description: Data Translation DT9812 USB module * Devices: [Data Translation] DT9812 (dt9812) * Author: anders.blomdell@control.lth.se (Anders Blomdell) * Status: in development * 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 #include #include #include #include "../comedi_usb.h" #define DT9812_DIAGS_BOARD_INFO_ADDR 0xFBFF #define DT9812_MAX_WRITE_CMD_PIPE_SIZE 32 #define DT9812_MAX_READ_CMD_PIPE_SIZE 32 /* usb_bulk_msg() timout in milliseconds */ #define DT9812_USB_TIMEOUT 1000 /* * 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 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 */ }; enum dt9812_gain { 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, }; enum { DT9812_LEAST_USB_FIRMWARE_CMD_CODE = 0, /* Write Flash memory */ DT9812_W_FLASH_DATA = 0, /* Read Flash memory misc config info */ DT9812_R_FLASH_DATA = 1, /* * Register read/write commands for processor */ /* Read a single byte of USB memory */ DT9812_R_SINGLE_BYTE_REG = 2, /* Write a single byte of USB memory */ DT9812_W_SINGLE_BYTE_REG = 3, /* Multiple Reads of USB memory */ DT9812_R_MULTI_BYTE_REG = 4, /* Multiple Writes of USB memory */ DT9812_W_MULTI_BYTE_REG = 5, /* Read, (AND) with mask, OR value, then write (single) */ DT9812_RMW_SINGLE_BYTE_REG = 6, /* Read, (AND) with mask, OR value, then write (multiple) */ DT9812_RMW_MULTI_BYTE_REG = 7, /* * Register read/write commands for SMBus */ /* Read a single byte of SMBus */ DT9812_R_SINGLE_BYTE_SMBUS = 8, /* Write a single byte of SMBus */ DT9812_W_SINGLE_BYTE_SMBUS = 9, /* Multiple Reads of SMBus */ DT9812_R_MULTI_BYTE_SMBUS = 10, /* Multiple Writes of SMBus */ DT9812_W_MULTI_BYTE_SMBUS = 11, /* * Register read/write commands for a device */ /* Read a single byte of a device */ DT9812_R_SINGLE_BYTE_DEV = 12, /* Write a single byte of a device */ DT9812_W_SINGLE_BYTE_DEV = 13, /* Multiple Reads of a device */ DT9812_R_MULTI_BYTE_DEV = 14, /* Multiple Writes of a device */ DT9812_W_MULTI_BYTE_DEV = 15, /* Not sure if we'll need this */ DT9812_W_DAC_THRESHOLD = 16, /* Set interrupt on change mask */ DT9812_W_INT_ON_CHANGE_MASK = 17, /* Write (or Clear) the CGL for the ADC */ DT9812_W_CGL = 18, /* Multiple Reads of USB memory */ DT9812_R_MULTI_BYTE_USBMEM = 19, /* Multiple Writes to USB memory */ DT9812_W_MULTI_BYTE_USBMEM = 20, /* Issue a start command to a given subsystem */ DT9812_START_SUBSYSTEM = 21, /* Issue a stop command to a given subsystem */ DT9812_STOP_SUBSYSTEM = 22, /* calibrate the board using CAL_POT_CMD */ DT9812_CALIBRATE_POT = 23, /* set the DAC FIFO size */ DT9812_W_DAC_FIFO_SIZE = 24, /* Write or Clear the CGL for the DAC */ DT9812_W_CGL_DAC = 25, /* Read a single value from a subsystem */ DT9812_R_SINGLE_VALUE_CMD = 26, /* Write a single value to a subsystem */ DT9812_W_SINGLE_VALUE_CMD = 27, /* Valid DT9812_USB_FIRMWARE_CMD_CODE's will be less than this number */ DT9812_MAX_USB_FIRMWARE_CMD_CODE, }; struct dt9812_flash_data { __le16 numbytes; __le16 address; }; #define DT9812_MAX_NUM_MULTI_BYTE_RDS \ ((DT9812_MAX_WRITE_CMD_PIPE_SIZE - 4 - 1) / sizeof(u8)) struct dt9812_read_multi { u8 count; u8 address[DT9812_MAX_NUM_MULTI_BYTE_RDS]; }; struct dt9812_write_byte { u8 address; u8 value; }; #define DT9812_MAX_NUM_MULTI_BYTE_WRTS \ ((DT9812_MAX_WRITE_CMD_PIPE_SIZE - 4 - 1) / \ sizeof(struct dt9812_write_byte)) struct dt9812_write_multi { u8 count; struct dt9812_write_byte write[DT9812_MAX_NUM_MULTI_BYTE_WRTS]; }; struct dt9812_rmw_byte { u8 address; u8 and_mask; u8 or_value; }; #define DT9812_MAX_NUM_MULTI_BYTE_RMWS \ ((DT9812_MAX_WRITE_CMD_PIPE_SIZE - 4 - 1) / \ sizeof(struct dt9812_rmw_byte)) struct dt9812_rmw_multi { u8 count; struct dt9812_rmw_byte rmw[DT9812_MAX_NUM_MULTI_BYTE_RMWS]; }; struct dt9812_usb_cmd { __le32 cmd; union { struct dt9812_flash_data flash_data_info; struct dt9812_read_multi read_multi_info; struct dt9812_write_multi write_multi_info; struct dt9812_rmw_multi rmw_multi_info; } u; }; struct dt9812_private { struct mutex mut; struct { __u8 addr; size_t size; } cmd_wr, cmd_rd; u16 device; }; static int dt9812_read_info(struct comedi_device *dev, int offset, void *buf, size_t buf_size) { struct usb_device *usb = comedi_to_usb_dev(dev); struct dt9812_private *devpriv = dev->private; struct dt9812_usb_cmd cmd; int count, ret; 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); /* DT9812 only responds to 32 byte writes!! */ ret = usb_bulk_msg(usb, usb_sndbulkpipe(usb, devpriv->cmd_wr.addr), &cmd, 32, &count, DT9812_USB_TIMEOUT); if (ret) return ret; return usb_bulk_msg(usb, usb_rcvbulkpipe(usb, devpriv->cmd_rd.addr), buf, buf_size, &count, DT9812_USB_TIMEOUT); } static int dt9812_read_multiple_registers(struct comedi_device *dev, int reg_count, u8 *address, u8 *value) { struct usb_device *usb = comedi_to_usb_dev(dev); struct dt9812_private *devpriv = dev->private; struct dt9812_usb_cmd cmd; int i, count, ret; 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]; /* DT9812 only responds to 32 byte writes!! */ ret = usb_bulk_msg(usb, usb_sndbulkpipe(usb, devpriv->cmd_wr.addr), &cmd, 32, &count, DT9812_USB_TIMEOUT); if (ret) return ret; return usb_bulk_msg(usb, usb_rcvbulkpipe(usb, devpriv->cmd_rd.addr), value, reg_count, &count, DT9812_USB_TIMEOUT); } static int dt9812_write_multiple_registers(struct comedi_device *dev, int reg_count, u8 *address, u8 *value) { struct usb_device *usb = comedi_to_usb_dev(dev); struct dt9812_private *devpriv = dev->private; struct dt9812_usb_cmd cmd; int i, count; 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]; } /* DT9812 only responds to 32 byte writes!! */ return usb_bulk_msg(usb, usb_sndbulkpipe(usb, devpriv->cmd_wr.addr), &cmd, 32, &count, DT9812_USB_TIMEOUT); } static int dt9812_rmw_multiple_registers(struct comedi_device *dev, int reg_count, struct dt9812_rmw_byte *rmw) { struct usb_device *usb = comedi_to_usb_dev(dev); struct dt9812_private *devpriv = dev->private; struct dt9812_usb_cmd cmd; int i, count; 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]; /* DT9812 only responds to 32 byte writes!! */ return usb_bulk_msg(usb, usb_sndbulkpipe(usb, devpriv->cmd_wr.addr), &cmd, 32, &count, DT9812_USB_TIMEOUT); } static int dt9812_digital_in(struct comedi_device *dev, u8 *bits) { struct dt9812_private *devpriv = dev->private; u8 reg[2] = { F020_SFR_P3, F020_SFR_P1 }; u8 value[2]; int ret; mutex_lock(&devpriv->mut); ret = dt9812_read_multiple_registers(dev, 2, reg, value); if (ret == 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); } mutex_unlock(&devpriv->mut); return ret; } static int dt9812_digital_out(struct comedi_device *dev, u8 bits) { struct dt9812_private *devpriv = dev->private; u8 reg[1] = { F020_SFR_P2 }; u8 value[1] = { bits }; int ret; mutex_lock(&devpriv->mut); ret = dt9812_write_multiple_registers(dev, 1, reg, value); mutex_unlock(&devpriv->mut); return ret; } static void dt9812_configure_mux(struct comedi_device *dev, struct dt9812_rmw_byte *rmw, int channel) { struct dt9812_private *devpriv = dev->private; if (devpriv->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, 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(struct comedi_device *dev, struct dt9812_rmw_byte *rmw, enum dt9812_gain gain) { struct dt9812_private *devpriv = dev->private; /* In the DT9812/10V, there is an external gain of 0.5 */ if (devpriv->device == DT9812_DEVID_DT9812_10) 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; default: /* this should never happen, just use a gain of 1 */ 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; } } static int dt9812_analog_in(struct comedi_device *dev, int channel, u16 *value, enum dt9812_gain gain) { struct dt9812_private *devpriv = dev->private; struct dt9812_rmw_byte rmw[3]; u8 reg[3] = { F020_SFR_ADC0CN, F020_SFR_ADC0H, F020_SFR_ADC0L }; u8 val[3]; int ret; mutex_lock(&devpriv->mut); /* 1 select the gain */ dt9812_configure_gain(dev, &rmw[0], gain); /* 2 set the MUX to select the channel */ dt9812_configure_mux(dev, &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; ret = dt9812_rmw_multiple_registers(dev, 3, rmw); if (ret) goto exit; /* read the status and ADC */ ret = dt9812_read_multiple_registers(dev, 3, reg, val); if (ret) goto exit; /* * 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 (devpriv->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; } } exit: mutex_unlock(&devpriv->mut); return ret; } static int dt9812_analog_out(struct comedi_device *dev, int channel, u16 value) { struct dt9812_private *devpriv = dev->private; struct dt9812_rmw_byte rmw[3]; int ret; mutex_lock(&devpriv->mut); 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 lsb of DAC value first */ rmw[1].address = F020_SFR_DAC0L; rmw[1].and_mask = 0xff; rmw[1].or_value = value & 0xff; /* 3. load msb 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 lsb of DAC value first */ rmw[1].address = F020_SFR_DAC1L; rmw[1].and_mask = 0xff; rmw[1].or_value = value & 0xff; /* 3. load msb 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; } ret = dt9812_rmw_multiple_registers(dev, 3, rmw); mutex_unlock(&devpriv->mut); return ret; } static int dt9812_di_insn_bits(struct comedi_device *dev, struct comedi_subdevice *s, struct comedi_insn *insn, unsigned int *data) { u8 bits = 0; int ret; ret = dt9812_digital_in(dev, &bits); if (ret) return ret; data[1] = bits; return insn->n; } static int dt9812_do_insn_bits(struct comedi_device *dev, struct comedi_subdevice *s, struct comedi_insn *insn, unsigned int *data) { if (comedi_dio_update_state(s, data)) dt9812_digital_out(dev, s->state); data[1] = s->state; return insn->n; } static int dt9812_ai_insn_read(struct comedi_device *dev, struct comedi_subdevice *s, struct comedi_insn *insn, unsigned int *data) { unsigned int chan = CR_CHAN(insn->chanspec); u16 val = 0; int ret; int i; for (i = 0; i < insn->n; i++) { ret = dt9812_analog_in(dev, chan, &val, DT9812_GAIN_1); if (ret) return ret; data[i] = val; } return insn->n; } static int dt9812_ao_insn_read(struct comedi_device *dev, struct comedi_subdevice *s, struct comedi_insn *insn, unsigned int *data) { struct dt9812_private *devpriv = dev->private; int ret; mutex_lock(&devpriv->mut); ret = comedi_readback_insn_read(dev, s, insn, data); mutex_unlock(&devpriv->mut); return ret; } static int dt9812_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); int i; for (i = 0; i < insn->n; i++) { unsigned int val = data[i]; int ret; ret = dt9812_analog_out(dev, chan, val); if (ret) return ret; s->readback[chan] = val; } return insn->n; } static int dt9812_find_endpoints(struct comedi_device *dev) { struct usb_interface *intf = comedi_to_usb_interface(dev); struct usb_host_interface *host = intf->cur_altsetting; struct dt9812_private *devpriv = dev->private; struct usb_endpoint_descriptor *ep; int i; if (host->desc.bNumEndpoints != 5) { dev_err(dev->class_dev, "Wrong number of endpoints\n"); return -ENODEV; } for (i = 0; i < host->desc.bNumEndpoints; ++i) { int dir = -1; ep = &host->endpoint[i].desc; switch (i) { case 0: /* unused message pipe */ dir = USB_DIR_IN; break; case 1: dir = USB_DIR_OUT; devpriv->cmd_wr.addr = ep->bEndpointAddress; devpriv->cmd_wr.size = usb_endpoint_maxp(ep); break; case 2: dir = USB_DIR_IN; devpriv->cmd_rd.addr = ep->bEndpointAddress; devpriv->cmd_rd.size = usb_endpoint_maxp(ep); break; case 3: /* unused write stream */ dir = USB_DIR_OUT; break; case 4: /* unused read stream */ dir = USB_DIR_IN; break; } if ((ep->bEndpointAddress & USB_DIR_IN) != dir) { dev_err(dev->class_dev, "Endpoint has wrong direction\n"); return -ENODEV; } } return 0; } static int dt9812_reset_device(struct comedi_device *dev) { struct usb_device *usb = comedi_to_usb_dev(dev); struct dt9812_private *devpriv = dev->private; u32 serial; u16 vendor; u16 product; u8 tmp8; __le16 tmp16; __le32 tmp32; int ret; int i; ret = dt9812_read_info(dev, 0, &tmp8, sizeof(tmp8)); if (ret) { /* * Seems like a configuration reset is necessary if driver is * reloaded while device is attached */ usb_reset_configuration(usb); for (i = 0; i < 10; i++) { ret = dt9812_read_info(dev, 1, &tmp8, sizeof(tmp8)); if (ret == 0) break; } if (ret) { dev_err(dev->class_dev, "unable to reset configuration\n"); return ret; } } ret = dt9812_read_info(dev, 1, &tmp16, sizeof(tmp16)); if (ret) { dev_err(dev->class_dev, "failed to read vendor id\n"); return ret; } vendor = le16_to_cpu(tmp16); ret = dt9812_read_info(dev, 3, &tmp16, sizeof(tmp16)); if (ret) { dev_err(dev->class_dev, "failed to read product id\n"); return ret; } product = le16_to_cpu(tmp16); ret = dt9812_read_info(dev, 5, &tmp16, sizeof(tmp16)); if (ret) { dev_err(dev->class_dev, "failed to read device id\n"); return ret; } devpriv->device = le16_to_cpu(tmp16); ret = dt9812_read_info(dev, 7, &tmp32, sizeof(tmp32)); if (ret) { dev_err(dev->class_dev, "failed to read serial number\n"); return ret; } serial = le32_to_cpu(tmp32); /* let the user know what node this device is now attached to */ dev_info(dev->class_dev, "USB DT9812 (%4.4x.%4.4x.%4.4x) #0x%8.8x\n", vendor, product, devpriv->device, serial); if (devpriv->device != DT9812_DEVID_DT9812_10 && devpriv->device != DT9812_DEVID_DT9812_2PT5) { dev_err(dev->class_dev, "Unsupported device!\n"); return -EINVAL; } return 0; } static int dt9812_auto_attach(struct comedi_device *dev, unsigned long context) { struct usb_interface *intf = comedi_to_usb_interface(dev); struct dt9812_private *devpriv; struct comedi_subdevice *s; bool is_unipolar; int ret; int i; devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv)); if (!devpriv) return -ENOMEM; mutex_init(&devpriv->mut); usb_set_intfdata(intf, devpriv); ret = dt9812_find_endpoints(dev); if (ret) return ret; ret = dt9812_reset_device(dev); if (ret) return ret; is_unipolar = (devpriv->device == DT9812_DEVID_DT9812_2PT5); ret = comedi_alloc_subdevices(dev, 4); if (ret) return ret; /* Digital Input subdevice */ s = &dev->subdevices[0]; s->type = COMEDI_SUBD_DI; s->subdev_flags = SDF_READABLE; s->n_chan = 8; s->maxdata = 1; s->range_table = &range_digital; s->insn_bits = dt9812_di_insn_bits; /* Digital Output subdevice */ s = &dev->subdevices[1]; s->type = COMEDI_SUBD_DO; s->subdev_flags = SDF_WRITABLE; s->n_chan = 8; s->maxdata = 1; s->range_table = &range_digital; s->insn_bits = dt9812_do_insn_bits; /* Analog Input subdevice */ s = &dev->subdevices[2]; s->type = COMEDI_SUBD_AI; s->subdev_flags = SDF_READABLE | SDF_GROUND; s->n_chan = 8; s->maxdata = 0x0fff; s->range_table = is_unipolar ? &range_unipolar2_5 : &range_bipolar10; s->insn_read = dt9812_ai_insn_read; /* Analog Output subdevice */ s = &dev->subdevices[3]; s->type = COMEDI_SUBD_AO; s->subdev_flags = SDF_WRITABLE; s->n_chan = 2; s->maxdata = 0x0fff; s->range_table = is_unipolar ? &range_unipolar2_5 : &range_bipolar10; s->insn_write = dt9812_ao_insn_write; s->insn_read = dt9812_ao_insn_read; ret = comedi_alloc_subdev_readback(s); if (ret) return ret; for (i = 0; i < s->n_chan; i++) s->readback[i] = is_unipolar ? 0x0000 : 0x0800; return 0; } static void dt9812_detach(struct comedi_device *dev) { struct usb_interface *intf = comedi_to_usb_interface(dev); struct dt9812_private *devpriv = dev->private; if (!devpriv) return; mutex_lock(&devpriv->mut); usb_set_intfdata(intf, NULL); mutex_unlock(&devpriv->mut); } static struct comedi_driver dt9812_driver = { .driver_name = "dt9812", .module = THIS_MODULE, .auto_attach = dt9812_auto_attach, .detach = dt9812_detach, }; static int dt9812_usb_probe(struct usb_interface *intf, const struct usb_device_id *id) { return comedi_usb_auto_config(intf, &dt9812_driver, id->driver_info); } static const struct usb_device_id dt9812_usb_table[] = { { USB_DEVICE(0x0867, 0x9812) }, { } }; MODULE_DEVICE_TABLE(usb, dt9812_usb_table); static struct usb_driver dt9812_usb_driver = { .name = "dt9812", .id_table = dt9812_usb_table, .probe = dt9812_usb_probe, .disconnect = comedi_usb_auto_unconfig, }; module_comedi_usb_driver(dt9812_driver, dt9812_usb_driver); MODULE_AUTHOR("Anders Blomdell "); MODULE_DESCRIPTION("Comedi DT9812 driver"); MODULE_LICENSE("GPL");