X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=kernel%2Fdrivers%2Fstaging%2Fcomedi%2Fdrivers%2Fcomedi_parport.c;fp=kernel%2Fdrivers%2Fstaging%2Fcomedi%2Fdrivers%2Fcomedi_parport.c;h=15a4093efda13869c0be6be98429ff03fdf5cbd4;hb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;hp=0000000000000000000000000000000000000000;hpb=98260f3884f4a202f9ca5eabed40b1354c489b29;p=kvmfornfv.git diff --git a/kernel/drivers/staging/comedi/drivers/comedi_parport.c b/kernel/drivers/staging/comedi/drivers/comedi_parport.c new file mode 100644 index 000000000..15a4093ef --- /dev/null +++ b/kernel/drivers/staging/comedi/drivers/comedi_parport.c @@ -0,0 +1,314 @@ +/* + * comedi_parport.c + * Comedi driver for standard parallel port + * + * For more information see: + * http://retired.beyondlogic.org/spp/parallel.htm + * + * COMEDI - Linux Control and Measurement Device Interface + * Copyright (C) 1998,2001 David A. Schleef + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +/* + * Driver: comedi_parport + * Description: Standard PC parallel port + * Author: ds + * Status: works in immediate mode + * Devices: [standard] parallel port (comedi_parport) + * Updated: Tue, 30 Apr 2002 21:11:45 -0700 + * + * A cheap and easy way to get a few more digital I/O lines. Steal + * additional parallel ports from old computers or your neighbors' + * computers. + * + * Option list: + * 0: I/O port base for the parallel port. + * 1: IRQ (optional) + * + * Parallel Port Lines: + * + * pin subdev chan type name + * ----- ------ ---- ---- -------------- + * 1 2 0 DO strobe + * 2 0 0 DIO data 0 + * 3 0 1 DIO data 1 + * 4 0 2 DIO data 2 + * 5 0 3 DIO data 3 + * 6 0 4 DIO data 4 + * 7 0 5 DIO data 5 + * 8 0 6 DIO data 6 + * 9 0 7 DIO data 7 + * 10 1 3 DI ack + * 11 1 4 DI busy + * 12 1 2 DI paper out + * 13 1 1 DI select in + * 14 2 1 DO auto LF + * 15 1 0 DI error + * 16 2 2 DO init + * 17 2 3 DO select printer + * 18-25 ground + * + * When an IRQ is configured subdevice 3 pretends to be a digital + * input subdevice, but it always returns 0 when read. However, if + * you run a command with scan_begin_src=TRIG_EXT, it uses pin 10 + * as a external trigger, which can be used to wake up tasks. + */ + +#include +#include + +#include "../comedidev.h" + +/* + * Register map + */ +#define PARPORT_DATA_REG 0x00 +#define PARPORT_STATUS_REG 0x01 +#define PARPORT_CTRL_REG 0x02 +#define PARPORT_CTRL_IRQ_ENA (1 << 4) +#define PARPORT_CTRL_BIDIR_ENA (1 << 5) + +static int parport_data_reg_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, dev->iobase + PARPORT_DATA_REG); + + data[1] = inb(dev->iobase + PARPORT_DATA_REG); + + return insn->n; +} + +static int parport_data_reg_insn_config(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_insn *insn, + unsigned int *data) +{ + unsigned int ctrl; + int ret; + + ret = comedi_dio_insn_config(dev, s, insn, data, 0xff); + if (ret) + return ret; + + ctrl = inb(dev->iobase + PARPORT_CTRL_REG); + if (s->io_bits) + ctrl &= ~PARPORT_CTRL_BIDIR_ENA; + else + ctrl |= PARPORT_CTRL_BIDIR_ENA; + outb(ctrl, dev->iobase + PARPORT_CTRL_REG); + + return insn->n; +} + +static int parport_status_reg_insn_bits(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_insn *insn, + unsigned int *data) +{ + data[1] = inb(dev->iobase + PARPORT_STATUS_REG) >> 3; + + return insn->n; +} + +static int parport_ctrl_reg_insn_bits(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_insn *insn, + unsigned int *data) +{ + unsigned int ctrl; + + if (comedi_dio_update_state(s, data)) { + ctrl = inb(dev->iobase + PARPORT_CTRL_REG); + ctrl &= (PARPORT_CTRL_IRQ_ENA | PARPORT_CTRL_BIDIR_ENA); + ctrl |= s->state; + outb(ctrl, dev->iobase + PARPORT_CTRL_REG); + } + + data[1] = s->state; + + return insn->n; +} + +static int parport_intr_insn_bits(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_insn *insn, + unsigned int *data) +{ + data[1] = 0; + return insn->n; +} + +static int parport_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 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 parport_intr_cmd(struct comedi_device *dev, + struct comedi_subdevice *s) +{ + unsigned int ctrl; + + ctrl = inb(dev->iobase + PARPORT_CTRL_REG); + ctrl |= PARPORT_CTRL_IRQ_ENA; + outb(ctrl, dev->iobase + PARPORT_CTRL_REG); + + return 0; +} + +static int parport_intr_cancel(struct comedi_device *dev, + struct comedi_subdevice *s) +{ + unsigned int ctrl; + + ctrl = inb(dev->iobase + PARPORT_CTRL_REG); + ctrl &= ~PARPORT_CTRL_IRQ_ENA; + outb(ctrl, dev->iobase + PARPORT_CTRL_REG); + + return 0; +} + +static irqreturn_t parport_interrupt(int irq, void *d) +{ + struct comedi_device *dev = d; + struct comedi_subdevice *s = dev->read_subdev; + unsigned int ctrl; + + ctrl = inb(dev->iobase + PARPORT_CTRL_REG); + if (!(ctrl & PARPORT_CTRL_IRQ_ENA)) + return IRQ_NONE; + + comedi_buf_write_samples(s, &s->state, 1); + comedi_handle_events(dev, s); + + return IRQ_HANDLED; +} + +static int parport_attach(struct comedi_device *dev, + struct comedi_devconfig *it) +{ + struct comedi_subdevice *s; + int ret; + + ret = comedi_request_region(dev, it->options[0], 0x03); + if (ret) + return ret; + + if (it->options[1]) { + ret = request_irq(it->options[1], parport_interrupt, 0, + dev->board_name, dev); + if (ret == 0) + dev->irq = it->options[1]; + } + + ret = comedi_alloc_subdevices(dev, dev->irq ? 4 : 3); + if (ret) + return ret; + + /* Digial I/O subdevice - Parallel port DATA register */ + s = &dev->subdevices[0]; + s->type = COMEDI_SUBD_DIO; + s->subdev_flags = SDF_READABLE | SDF_WRITABLE; + s->n_chan = 8; + s->maxdata = 1; + s->range_table = &range_digital; + s->insn_bits = parport_data_reg_insn_bits; + s->insn_config = parport_data_reg_insn_config; + + /* Digial Input subdevice - Parallel port STATUS register */ + s = &dev->subdevices[1]; + s->type = COMEDI_SUBD_DI; + s->subdev_flags = SDF_READABLE; + s->n_chan = 5; + s->maxdata = 1; + s->range_table = &range_digital; + s->insn_bits = parport_status_reg_insn_bits; + + /* Digial Output subdevice - Parallel port CONTROL register */ + s = &dev->subdevices[2]; + s->type = COMEDI_SUBD_DO; + s->subdev_flags = SDF_WRITABLE; + s->n_chan = 4; + s->maxdata = 1; + s->range_table = &range_digital; + s->insn_bits = parport_ctrl_reg_insn_bits; + + if (dev->irq) { + /* Digial Input subdevice - Interrupt support */ + s = &dev->subdevices[3]; + dev->read_subdev = s; + 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 = parport_intr_insn_bits; + s->len_chanlist = 1; + s->do_cmdtest = parport_intr_cmdtest; + s->do_cmd = parport_intr_cmd; + s->cancel = parport_intr_cancel; + } + + outb(0, dev->iobase + PARPORT_DATA_REG); + outb(0, dev->iobase + PARPORT_CTRL_REG); + + return 0; +} + +static struct comedi_driver parport_driver = { + .driver_name = "comedi_parport", + .module = THIS_MODULE, + .attach = parport_attach, + .detach = comedi_legacy_detach, +}; +module_comedi_driver(parport_driver); + +MODULE_AUTHOR("Comedi http://www.comedi.org"); +MODULE_DESCRIPTION("Comedi: Standard parallel port driver"); +MODULE_LICENSE("GPL");