// SPDX-License-Identifier: GPL-2.0+ /* * Comedi driver for National Instruments AT-A2150 boards * Copyright (C) 2001, 2002 Frank Mori Hess <[email protected]> * * COMEDI - Linux Control and Measurement Device Interface * Copyright (C) 2000 David A. Schleef <[email protected]> */ /* * Driver: ni_at_a2150 * Description: National Instruments AT-A2150 * Author: Frank Mori Hess * Status: works * Devices: [National Instruments] AT-A2150C (at_a2150c), AT-2150S (at_a2150s) * * Configuration options: * [0] - I/O port base address * [1] - IRQ (optional, required for timed conversions) * [2] - DMA (optional, required for timed conversions) * * Yet another driver for obsolete hardware brought to you by Frank Hess. * Testing and debugging help provided by Dave Andruczyk. * * If you want to ac couple the board's inputs, use AREF_OTHER. * * The only difference in the boards is their master clock frequencies. * * References (from ftp://ftp.natinst.com/support/manuals): * 320360.pdf AT-A2150 User Manual * * TODO: * - analog level triggering * - TRIG_WAKE_EOS */ #include <linux/module.h> #include <linux/delay.h> #include <linux/interrupt.h> #include <linux/slab.h> #include <linux/io.h> #include <linux/comedi/comedidev.h> #include <linux/comedi/comedi_8254.h> #include <linux/comedi/comedi_isadma.h> #define A2150_DMA_BUFFER_SIZE … /* Registers and bits */ #define CONFIG_REG … #define CHANNEL_BITS(x) … #define CHANNEL_MASK … #define CLOCK_SELECT_BITS(x) … #define CLOCK_DIVISOR_BITS(x) … #define CLOCK_MASK … /* enable (don't internally ground) channels 0 and 1 */ #define ENABLE0_BIT … /* enable (don't internally ground) channels 2 and 3 */ #define ENABLE1_BIT … #define AC0_BIT … #define AC1_BIT … #define APD_BIT … #define DPD_BIT … #define TRIGGER_REG … #define POST_TRIGGER_BITS … #define DELAY_TRIGGER_BITS … #define HW_TRIG_EN … #define FIFO_START_REG … #define FIFO_RESET_REG … #define FIFO_DATA_REG … #define DMA_TC_CLEAR_REG … #define STATUS_REG … #define FNE_BIT … #define OVFL_BIT … #define EDAQ_BIT … #define DCAL_BIT … #define INTR_BIT … /* dma terminal count interrupt has occurred */ #define DMA_TC_BIT … #define ID_BITS(x) … #define IRQ_DMA_CNTRL_REG … #define DMA_CHAN_BITS(x) … #define DMA_EN_BIT … #define IRQ_LVL_BITS(x) … #define FIFO_INTR_EN_BIT … #define FIFO_INTR_FHF_BIT … /* enable interrupt on dma terminal count */ #define DMA_INTR_EN_BIT … #define DMA_DEM_EN_BIT … #define I8253_BASE_REG … struct a2150_board { … }; /* analog input range */ static const struct comedi_lrange range_a2150 = …; /* enum must match board indices */ enum { … }; static const struct a2150_board a2150_boards[] = …; struct a2150_private { … }; /* interrupt service routine */ static irqreturn_t a2150_interrupt(int irq, void *d) { … } static int a2150_cancel(struct comedi_device *dev, struct comedi_subdevice *s) { … } /* * sets bits in devpriv->clock_bits to nearest approximation of requested * period, adjusts requested period to actual timing. */ static int a2150_get_timing(struct comedi_device *dev, unsigned int *period, unsigned int flags) { … } static int a2150_set_chanlist(struct comedi_device *dev, unsigned int start_channel, unsigned int num_channels) { … } static int a2150_ai_check_chanlist(struct comedi_device *dev, struct comedi_subdevice *s, struct comedi_cmd *cmd) { … } static int a2150_ai_cmdtest(struct comedi_device *dev, struct comedi_subdevice *s, struct comedi_cmd *cmd) { … } static int a2150_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s) { … } static int a2150_ai_eoc(struct comedi_device *dev, struct comedi_subdevice *s, struct comedi_insn *insn, unsigned long context) { … } static int a2150_ai_rinsn(struct comedi_device *dev, struct comedi_subdevice *s, struct comedi_insn *insn, unsigned int *data) { … } static void a2150_alloc_irq_and_dma(struct comedi_device *dev, struct comedi_devconfig *it) { … } static void a2150_free_dma(struct comedi_device *dev) { … } static const struct a2150_board *a2150_probe(struct comedi_device *dev) { … } static int a2150_attach(struct comedi_device *dev, struct comedi_devconfig *it) { const struct a2150_board *board; struct a2150_private *devpriv; struct comedi_subdevice *s; static const int timeout = 2000; int i; int ret; devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv)); if (!devpriv) return -ENOMEM; ret = comedi_request_region(dev, it->options[0], 0x1c); if (ret) return ret; board = a2150_probe(dev); if (!board) return -ENODEV; dev->board_ptr = board; dev->board_name = board->name; /* an IRQ and DMA are required to support async commands */ a2150_alloc_irq_and_dma(dev, it); dev->pacer = comedi_8254_io_alloc(dev->iobase + I8253_BASE_REG, 0, I8254_IO8, 0); if (IS_ERR(dev->pacer)) return PTR_ERR(dev->pacer); ret = comedi_alloc_subdevices(dev, 1); if (ret) return ret; /* analog input subdevice */ s = &dev->subdevices[0]; s->type = COMEDI_SUBD_AI; s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_OTHER; s->n_chan = 4; s->maxdata = 0xffff; s->range_table = &range_a2150; s->insn_read = a2150_ai_rinsn; if (dev->irq) { dev->read_subdev = s; s->subdev_flags |= SDF_CMD_READ; s->len_chanlist = s->n_chan; s->do_cmd = a2150_ai_cmd; s->do_cmdtest = a2150_ai_cmdtest; s->cancel = a2150_cancel; } /* set card's irq and dma levels */ outw(devpriv->irq_dma_bits, dev->iobase + IRQ_DMA_CNTRL_REG); /* reset and sync adc clock circuitry */ outw_p(DPD_BIT | APD_BIT, dev->iobase + CONFIG_REG); outw_p(DPD_BIT, dev->iobase + CONFIG_REG); /* initialize configuration register */ devpriv->config_bits = 0; outw(devpriv->config_bits, dev->iobase + CONFIG_REG); /* wait until offset calibration is done, then enable analog inputs */ for (i = 0; i < timeout; i++) { if ((DCAL_BIT & inw(dev->iobase + STATUS_REG)) == 0) break; usleep_range(1000, 3000); } if (i == timeout) { dev_err(dev->class_dev, "timed out waiting for offset calibration to complete\n"); return -ETIME; } devpriv->config_bits |= ENABLE0_BIT | ENABLE1_BIT; outw(devpriv->config_bits, dev->iobase + CONFIG_REG); return 0; }; static void a2150_detach(struct comedi_device *dev) { if (dev->iobase) outw(APD_BIT | DPD_BIT, dev->iobase + CONFIG_REG); a2150_free_dma(dev); comedi_legacy_detach(dev); }; static struct comedi_driver ni_at_a2150_driver = …; module_comedi_driver(…); MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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