diff options
Diffstat (limited to 'drivers/comedi/drivers/amplc_pc236_common.c')
| -rw-r--r-- | drivers/comedi/drivers/amplc_pc236_common.c | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/drivers/comedi/drivers/amplc_pc236_common.c b/drivers/comedi/drivers/amplc_pc236_common.c new file mode 100644 index 000000000000..981d281e87a1 --- /dev/null +++ b/drivers/comedi/drivers/amplc_pc236_common.c @@ -0,0 +1,193 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * comedi/drivers/amplc_pc236_common.c + * Common support code for "amplc_pc236" and "amplc_pci236". + * + * Copyright (C) 2002-2014 MEV Ltd. <https://www.mev.co.uk/> + * + * COMEDI - Linux Control and Measurement Device Interface + * Copyright (C) 2000 David A. Schleef <ds@schleef.org> + */ + +#include <linux/module.h> +#include <linux/interrupt.h> + +#include "../comedidev.h" + +#include "amplc_pc236.h" +#include "8255.h" + +static void pc236_intr_update(struct comedi_device *dev, bool enable) +{ + const struct pc236_board *board = dev->board_ptr; + struct pc236_private *devpriv = dev->private; + unsigned long flags; + + spin_lock_irqsave(&dev->spinlock, flags); + devpriv->enable_irq = enable; + if (board->intr_update_cb) + board->intr_update_cb(dev, enable); + spin_unlock_irqrestore(&dev->spinlock, flags); +} + +/* + * This function is called when an interrupt occurs to check whether + * the interrupt has been marked as enabled and was generated by the + * board. If so, the function prepares the hardware for the next + * interrupt. + * Returns false if the interrupt should be ignored. + */ +static bool pc236_intr_check(struct comedi_device *dev) +{ + const struct pc236_board *board = dev->board_ptr; + struct pc236_private *devpriv = dev->private; + bool retval = false; + unsigned long flags; + + spin_lock_irqsave(&dev->spinlock, flags); + if (devpriv->enable_irq) { + if (board->intr_chk_clr_cb) + retval = board->intr_chk_clr_cb(dev); + else + retval = true; + } + spin_unlock_irqrestore(&dev->spinlock, flags); + + return retval; +} + +static int pc236_intr_insn(struct comedi_device *dev, + struct comedi_subdevice *s, struct comedi_insn *insn, + unsigned int *data) +{ + data[1] = 0; + return insn->n; +} + +static int pc236_intr_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 it 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 pc236_intr_cmd(struct comedi_device *dev, struct comedi_subdevice *s) +{ + pc236_intr_update(dev, true); + + return 0; +} + +static int pc236_intr_cancel(struct comedi_device *dev, + struct comedi_subdevice *s) +{ + pc236_intr_update(dev, false); + + return 0; +} + +static irqreturn_t pc236_interrupt(int irq, void *d) +{ + struct comedi_device *dev = d; + struct comedi_subdevice *s = dev->read_subdev; + bool handled; + + handled = pc236_intr_check(dev); + if (dev->attached && handled) { + unsigned short val = 0; + + comedi_buf_write_samples(s, &val, 1); + comedi_handle_events(dev, s); + } + return IRQ_RETVAL(handled); +} + +int amplc_pc236_common_attach(struct comedi_device *dev, unsigned long iobase, + unsigned int irq, unsigned long req_irq_flags) +{ + struct comedi_subdevice *s; + int ret; + + dev->iobase = iobase; + + ret = comedi_alloc_subdevices(dev, 2); + if (ret) + return ret; + + s = &dev->subdevices[0]; + /* digital i/o subdevice (8255) */ + ret = subdev_8255_init(dev, s, NULL, 0x00); + if (ret) + return ret; + + s = &dev->subdevices[1]; + dev->read_subdev = s; + s->type = COMEDI_SUBD_UNUSED; + pc236_intr_update(dev, false); + if (irq) { + if (request_irq(irq, pc236_interrupt, req_irq_flags, + dev->board_name, dev) >= 0) { + dev->irq = irq; + s->type = COMEDI_SUBD_DI; + s->subdev_flags = SDF_READABLE | SDF_CMD_READ; + s->n_chan = 1; + s->maxdata = 1; + s->range_table = &range_digital; + s->insn_bits = pc236_intr_insn; + s->len_chanlist = 1; + s->do_cmdtest = pc236_intr_cmdtest; + s->do_cmd = pc236_intr_cmd; + s->cancel = pc236_intr_cancel; + } + } + + return 0; +} +EXPORT_SYMBOL_GPL(amplc_pc236_common_attach); + +static int __init amplc_pc236_common_init(void) +{ + return 0; +} +module_init(amplc_pc236_common_init); + +static void __exit amplc_pc236_common_exit(void) +{ +} +module_exit(amplc_pc236_common_exit); + +MODULE_AUTHOR("Comedi https://www.comedi.org"); +MODULE_DESCRIPTION("Comedi helper for amplc_pc236 and amplc_pci236"); +MODULE_LICENSE("GPL"); |