diff options
Diffstat (limited to 'drivers/comedi/drivers/dt2817.c')
| -rw-r--r-- | drivers/comedi/drivers/dt2817.c | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/drivers/comedi/drivers/dt2817.c b/drivers/comedi/drivers/dt2817.c new file mode 100644 index 000000000000..7c1463e835d3 --- /dev/null +++ b/drivers/comedi/drivers/dt2817.c @@ -0,0 +1,140 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * comedi/drivers/dt2817.c + * Hardware driver for Data Translation DT2817 + * + * COMEDI - Linux Control and Measurement Device Interface + * Copyright (C) 1998 David A. Schleef <ds@schleef.org> + */ +/* + * Driver: dt2817 + * Description: Data Translation DT2817 + * Author: ds + * Status: complete + * Devices: [Data Translation] DT2817 (dt2817) + * + * A very simple digital I/O card. Four banks of 8 lines, each bank + * is configurable for input or output. One wonders why it takes a + * 50 page manual to describe this thing. + * + * The driver (which, btw, is much less than 50 pages) has 1 subdevice + * with 32 channels, configurable in groups of 8. + * + * Configuration options: + * [0] - I/O port base base address + */ + +#include <linux/module.h> +#include "../comedidev.h" + +#define DT2817_CR 0 +#define DT2817_DATA 1 + +static int dt2817_dio_insn_config(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_insn *insn, + unsigned int *data) +{ + unsigned int chan = CR_CHAN(insn->chanspec); + unsigned int oe = 0; + unsigned int mask; + int ret; + + if (chan < 8) + mask = 0x000000ff; + else if (chan < 16) + mask = 0x0000ff00; + else if (chan < 24) + mask = 0x00ff0000; + else + mask = 0xff000000; + + ret = comedi_dio_insn_config(dev, s, insn, data, mask); + if (ret) + return ret; + + if (s->io_bits & 0x000000ff) + oe |= 0x1; + if (s->io_bits & 0x0000ff00) + oe |= 0x2; + if (s->io_bits & 0x00ff0000) + oe |= 0x4; + if (s->io_bits & 0xff000000) + oe |= 0x8; + + outb(oe, dev->iobase + DT2817_CR); + + return insn->n; +} + +static int dt2817_dio_insn_bits(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_insn *insn, + unsigned int *data) +{ + unsigned long iobase = dev->iobase + DT2817_DATA; + unsigned int mask; + unsigned int val; + + mask = comedi_dio_update_state(s, data); + if (mask) { + if (mask & 0x000000ff) + outb(s->state & 0xff, iobase + 0); + if (mask & 0x0000ff00) + outb((s->state >> 8) & 0xff, iobase + 1); + if (mask & 0x00ff0000) + outb((s->state >> 16) & 0xff, iobase + 2); + if (mask & 0xff000000) + outb((s->state >> 24) & 0xff, iobase + 3); + } + + val = inb(iobase + 0); + val |= (inb(iobase + 1) << 8); + val |= (inb(iobase + 2) << 16); + val |= (inb(iobase + 3) << 24); + + data[1] = val; + + return insn->n; +} + +static int dt2817_attach(struct comedi_device *dev, struct comedi_devconfig *it) +{ + int ret; + struct comedi_subdevice *s; + + ret = comedi_request_region(dev, it->options[0], 0x5); + if (ret) + return ret; + + ret = comedi_alloc_subdevices(dev, 1); + if (ret) + return ret; + + s = &dev->subdevices[0]; + + s->n_chan = 32; + s->type = COMEDI_SUBD_DIO; + s->subdev_flags = SDF_READABLE | SDF_WRITABLE; + s->range_table = &range_digital; + s->maxdata = 1; + s->insn_bits = dt2817_dio_insn_bits; + s->insn_config = dt2817_dio_insn_config; + + s->state = 0; + outb(0, dev->iobase + DT2817_CR); + + return 0; +} + +static struct comedi_driver dt2817_driver = { + .driver_name = "dt2817", + .module = THIS_MODULE, + .attach = dt2817_attach, + .detach = comedi_legacy_detach, +}; +module_comedi_driver(dt2817_driver); + +MODULE_AUTHOR("Comedi https://www.comedi.org"); +MODULE_DESCRIPTION("Comedi low-level driver"); +MODULE_LICENSE("GPL"); |