diff options
Diffstat (limited to 'drivers/comedi/drivers/aio_iiro_16.c')
| -rw-r--r-- | drivers/comedi/drivers/aio_iiro_16.c | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/drivers/comedi/drivers/aio_iiro_16.c b/drivers/comedi/drivers/aio_iiro_16.c new file mode 100644 index 000000000000..fe3876235075 --- /dev/null +++ b/drivers/comedi/drivers/aio_iiro_16.c @@ -0,0 +1,235 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * aio_iiro_16.c + * Comedi driver for Access I/O Products 104-IIRO-16 board + * Copyright (C) 2006 C&C Technologies, Inc. + */ + +/* + * Driver: aio_iiro_16 + * Description: Access I/O Products PC/104 Isolated Input/Relay Output Board + * Author: Zachary Ware <zach.ware@cctechnol.com> + * Devices: [Access I/O] 104-IIRO-16 (aio_iiro_16) + * Status: experimental + * + * Configuration Options: + * [0] - I/O port base address + * [1] - IRQ (optional) + * + * The board supports interrupts on change of state of the digital inputs. + * The sample data returned by the async command indicates which inputs + * changed state and the current state of the inputs: + * + * Bit 23 - IRQ Enable (1) / Disable (0) + * Bit 17 - Input 8-15 Changed State (1 = Changed, 0 = No Change) + * Bit 16 - Input 0-7 Changed State (1 = Changed, 0 = No Change) + * Bit 15 - Digital input 15 + * ... + * Bit 0 - Digital input 0 + */ + +#include <linux/module.h> +#include <linux/interrupt.h> + +#include "../comedidev.h" + +#define AIO_IIRO_16_RELAY_0_7 0x00 +#define AIO_IIRO_16_INPUT_0_7 0x01 +#define AIO_IIRO_16_IRQ 0x02 +#define AIO_IIRO_16_RELAY_8_15 0x04 +#define AIO_IIRO_16_INPUT_8_15 0x05 +#define AIO_IIRO_16_STATUS 0x07 +#define AIO_IIRO_16_STATUS_IRQE BIT(7) +#define AIO_IIRO_16_STATUS_INPUT_8_15 BIT(1) +#define AIO_IIRO_16_STATUS_INPUT_0_7 BIT(0) + +static unsigned int aio_iiro_16_read_inputs(struct comedi_device *dev) +{ + unsigned int val; + + val = inb(dev->iobase + AIO_IIRO_16_INPUT_0_7); + val |= inb(dev->iobase + AIO_IIRO_16_INPUT_8_15) << 8; + + return val; +} + +static irqreturn_t aio_iiro_16_cos(int irq, void *d) +{ + struct comedi_device *dev = d; + struct comedi_subdevice *s = dev->read_subdev; + unsigned int status; + unsigned int val; + + status = inb(dev->iobase + AIO_IIRO_16_STATUS); + if (!(status & AIO_IIRO_16_STATUS_IRQE)) + return IRQ_NONE; + + val = aio_iiro_16_read_inputs(dev); + val |= (status << 16); + + comedi_buf_write_samples(s, &val, 1); + comedi_handle_events(dev, s); + + return IRQ_HANDLED; +} + +static void aio_iiro_enable_irq(struct comedi_device *dev, bool enable) +{ + if (enable) + inb(dev->iobase + AIO_IIRO_16_IRQ); + else + outb(0, dev->iobase + AIO_IIRO_16_IRQ); +} + +static int aio_iiro_16_cos_cancel(struct comedi_device *dev, + struct comedi_subdevice *s) +{ + aio_iiro_enable_irq(dev, false); + + return 0; +} + +static int aio_iiro_16_cos_cmd(struct comedi_device *dev, + struct comedi_subdevice *s) +{ + aio_iiro_enable_irq(dev, true); + + return 0; +} + +static int aio_iiro_16_cos_cmdtest(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_cmd *cmd) +{ + int err = 0; + + /* Step 1 : check if triggers are trivially valid */ + + err |= comedi_check_trigger_src(&cmd->start_src, TRIG_NOW); + err |= comedi_check_trigger_src(&cmd->scan_begin_src, TRIG_EXT); + err |= comedi_check_trigger_src(&cmd->convert_src, TRIG_FOLLOW); + err |= comedi_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT); + err |= comedi_check_trigger_src(&cmd->stop_src, TRIG_NONE); + + if (err) + return 1; + + /* Step 2a : make sure trigger sources are unique */ + /* Step 2b : and mutually compatible */ + + /* Step 3: check if arguments are trivially valid */ + + err |= comedi_check_trigger_arg_is(&cmd->start_arg, 0); + err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, 0); + err |= comedi_check_trigger_arg_is(&cmd->convert_arg, 0); + err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg, + cmd->chanlist_len); + err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0); + + if (err) + return 3; + + /* Step 4: fix up any arguments */ + + /* Step 5: check channel list if it exists */ + + return 0; +} + +static int aio_iiro_16_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)) { + outb(s->state & 0xff, dev->iobase + AIO_IIRO_16_RELAY_0_7); + outb((s->state >> 8) & 0xff, + dev->iobase + AIO_IIRO_16_RELAY_8_15); + } + + data[1] = s->state; + + return insn->n; +} + +static int aio_iiro_16_di_insn_bits(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_insn *insn, + unsigned int *data) +{ + data[1] = aio_iiro_16_read_inputs(dev); + + return insn->n; +} + +static int aio_iiro_16_attach(struct comedi_device *dev, + struct comedi_devconfig *it) +{ + struct comedi_subdevice *s; + int ret; + + ret = comedi_request_region(dev, it->options[0], 0x8); + if (ret) + return ret; + + aio_iiro_enable_irq(dev, false); + + /* + * Digital input change of state interrupts are optionally supported + * using IRQ 2-7, 10-12, 14, or 15. + */ + if ((1 << it->options[1]) & 0xdcfc) { + ret = request_irq(it->options[1], aio_iiro_16_cos, 0, + dev->board_name, dev); + if (ret == 0) + dev->irq = it->options[1]; + } + + ret = comedi_alloc_subdevices(dev, 2); + if (ret) + return ret; + + /* Digital Output subdevice */ + s = &dev->subdevices[0]; + s->type = COMEDI_SUBD_DO; + s->subdev_flags = SDF_WRITABLE; + s->n_chan = 16; + s->maxdata = 1; + s->range_table = &range_digital; + s->insn_bits = aio_iiro_16_do_insn_bits; + + /* get the initial state of the relays */ + s->state = inb(dev->iobase + AIO_IIRO_16_RELAY_0_7) | + (inb(dev->iobase + AIO_IIRO_16_RELAY_8_15) << 8); + + /* Digital Input subdevice */ + s = &dev->subdevices[1]; + s->type = COMEDI_SUBD_DI; + s->subdev_flags = SDF_READABLE; + s->n_chan = 16; + s->maxdata = 1; + s->range_table = &range_digital; + s->insn_bits = aio_iiro_16_di_insn_bits; + if (dev->irq) { + dev->read_subdev = s; + s->subdev_flags |= SDF_CMD_READ | SDF_LSAMPL; + s->len_chanlist = 1; + s->do_cmdtest = aio_iiro_16_cos_cmdtest; + s->do_cmd = aio_iiro_16_cos_cmd; + s->cancel = aio_iiro_16_cos_cancel; + } + + return 0; +} + +static struct comedi_driver aio_iiro_16_driver = { + .driver_name = "aio_iiro_16", + .module = THIS_MODULE, + .attach = aio_iiro_16_attach, + .detach = comedi_legacy_detach, +}; +module_comedi_driver(aio_iiro_16_driver); + +MODULE_AUTHOR("Comedi https://www.comedi.org"); +MODULE_DESCRIPTION("Comedi driver for Access I/O Products 104-IIRO-16 board"); +MODULE_LICENSE("GPL"); |