diff options
Diffstat (limited to 'drivers/staging/comedi/drivers/amplc_pc236_common.c')
| -rw-r--r-- | drivers/staging/comedi/drivers/amplc_pc236_common.c | 193 |
1 files changed, 0 insertions, 193 deletions
diff --git a/drivers/staging/comedi/drivers/amplc_pc236_common.c b/drivers/staging/comedi/drivers/amplc_pc236_common.c deleted file mode 100644 index 981d281e87a1..000000000000 --- a/drivers/staging/comedi/drivers/amplc_pc236_common.c +++ /dev/null @@ -1,193 +0,0 @@ -// 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"); |