diff options
Diffstat (limited to 'kernel/drivers/staging/comedi/drivers/dt2815.c')
| -rw-r--r-- | kernel/drivers/staging/comedi/drivers/dt2815.c | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/kernel/drivers/staging/comedi/drivers/dt2815.c b/kernel/drivers/staging/comedi/drivers/dt2815.c new file mode 100644 index 000000000..fb08569c1 --- /dev/null +++ b/kernel/drivers/staging/comedi/drivers/dt2815.c @@ -0,0 +1,223 @@ +/* + comedi/drivers/dt2815.c + Hardware driver for Data Translation DT2815 + + COMEDI - Linux Control and Measurement Device Interface + Copyright (C) 1999 Anders Blomdell <anders.blomdell@control.lth.se> + + 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. + */ +/* +Driver: dt2815 +Description: Data Translation DT2815 +Author: ds +Status: mostly complete, untested +Devices: [Data Translation] DT2815 (dt2815) + +I'm not sure anyone has ever tested this board. If you have information +contrary, please update. + +Configuration options: + [0] - I/O port base base address + [1] - IRQ (unused) + [2] - Voltage unipolar/bipolar configuration + 0 == unipolar 5V (0V -- +5V) + 1 == bipolar 5V (-5V -- +5V) + [3] - Current offset configuration + 0 == disabled (0mA -- +32mAV) + 1 == enabled (+4mA -- +20mAV) + [4] - Firmware program configuration + 0 == program 1 (see manual table 5-4) + 1 == program 2 (see manual table 5-4) + 2 == program 3 (see manual table 5-4) + 3 == program 4 (see manual table 5-4) + [5] - Analog output 0 range configuration + 0 == voltage + 1 == current + [6] - Analog output 1 range configuration (same options) + [7] - Analog output 2 range configuration (same options) + [8] - Analog output 3 range configuration (same options) + [9] - Analog output 4 range configuration (same options) + [10] - Analog output 5 range configuration (same options) + [11] - Analog output 6 range configuration (same options) + [12] - Analog output 7 range configuration (same options) +*/ + +#include <linux/module.h> +#include "../comedidev.h" + +#include <linux/delay.h> + +#define DT2815_DATA 0 +#define DT2815_STATUS 1 + +struct dt2815_private { + const struct comedi_lrange *range_type_list[8]; + unsigned int ao_readback[8]; +}; + +static int dt2815_ao_status(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_insn *insn, + unsigned long context) +{ + unsigned int status; + + status = inb(dev->iobase + DT2815_STATUS); + if (status == context) + return 0; + return -EBUSY; +} + +static int dt2815_ao_insn_read(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_insn *insn, unsigned int *data) +{ + struct dt2815_private *devpriv = dev->private; + int i; + int chan = CR_CHAN(insn->chanspec); + + for (i = 0; i < insn->n; i++) + data[i] = devpriv->ao_readback[chan]; + + return i; +} + +static int dt2815_ao_insn(struct comedi_device *dev, struct comedi_subdevice *s, + struct comedi_insn *insn, unsigned int *data) +{ + struct dt2815_private *devpriv = dev->private; + int i; + int chan = CR_CHAN(insn->chanspec); + unsigned int lo, hi; + int ret; + + for (i = 0; i < insn->n; i++) { + lo = ((data[i] & 0x0f) << 4) | (chan << 1) | 0x01; + hi = (data[i] & 0xff0) >> 4; + + ret = comedi_timeout(dev, s, insn, dt2815_ao_status, 0x00); + if (ret) + return ret; + + outb(lo, dev->iobase + DT2815_DATA); + + ret = comedi_timeout(dev, s, insn, dt2815_ao_status, 0x10); + if (ret) + return ret; + + devpriv->ao_readback[chan] = data[i]; + } + return i; +} + +/* + options[0] Board base address + options[1] IRQ (not applicable) + options[2] Voltage unipolar/bipolar configuration + 0 == unipolar 5V (0V -- +5V) + 1 == bipolar 5V (-5V -- +5V) + options[3] Current offset configuration + 0 == disabled (0mA -- +32mAV) + 1 == enabled (+4mA -- +20mAV) + options[4] Firmware program configuration + 0 == program 1 (see manual table 5-4) + 1 == program 2 (see manual table 5-4) + 2 == program 3 (see manual table 5-4) + 3 == program 4 (see manual table 5-4) + options[5] Analog output 0 range configuration + 0 == voltage + 1 == current + options[6] Analog output 1 range configuration + ... + options[12] Analog output 7 range configuration + 0 == voltage + 1 == current + */ + +static int dt2815_attach(struct comedi_device *dev, struct comedi_devconfig *it) +{ + struct dt2815_private *devpriv; + struct comedi_subdevice *s; + int i; + const struct comedi_lrange *current_range_type, *voltage_range_type; + int ret; + + ret = comedi_request_region(dev, it->options[0], 0x2); + if (ret) + return ret; + + ret = comedi_alloc_subdevices(dev, 1); + if (ret) + return ret; + + devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv)); + if (!devpriv) + return -ENOMEM; + + s = &dev->subdevices[0]; + /* ao subdevice */ + s->type = COMEDI_SUBD_AO; + s->subdev_flags = SDF_WRITABLE; + s->maxdata = 0xfff; + s->n_chan = 8; + s->insn_write = dt2815_ao_insn; + s->insn_read = dt2815_ao_insn_read; + s->range_table_list = devpriv->range_type_list; + + current_range_type = (it->options[3]) + ? &range_4_20mA : &range_0_32mA; + voltage_range_type = (it->options[2]) + ? &range_bipolar5 : &range_unipolar5; + for (i = 0; i < 8; i++) { + devpriv->range_type_list[i] = (it->options[5 + i]) + ? current_range_type : voltage_range_type; + } + + /* Init the 2815 */ + outb(0x00, dev->iobase + DT2815_STATUS); + for (i = 0; i < 100; i++) { + /* This is incredibly slow (approx 20 ms) */ + unsigned int status; + + udelay(1000); + status = inb(dev->iobase + DT2815_STATUS); + if (status == 4) { + unsigned int program; + + program = (it->options[4] & 0x3) << 3 | 0x7; + outb(program, dev->iobase + DT2815_DATA); + dev_dbg(dev->class_dev, "program: 0x%x (@t=%d)\n", + program, i); + break; + } else if (status != 0x00) { + dev_dbg(dev->class_dev, + "unexpected status 0x%x (@t=%d)\n", + status, i); + if (status & 0x60) + outb(0x00, dev->iobase + DT2815_STATUS); + } + } + + return 0; +} + +static struct comedi_driver dt2815_driver = { + .driver_name = "dt2815", + .module = THIS_MODULE, + .attach = dt2815_attach, + .detach = comedi_legacy_detach, +}; +module_comedi_driver(dt2815_driver); + +MODULE_AUTHOR("Comedi http://www.comedi.org"); +MODULE_DESCRIPTION("Comedi low-level driver"); +MODULE_LICENSE("GPL"); |