Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-13 23:51:39 +00:00
Code Issues Packages Projects Releases Wiki Activity
master
linux/drivers/comedi/drivers/pcl711.c
Ian Abbott fade5e5b0b comedi: comedi_8254: Replace comedi_8254_init() and comedi_8254_mm_init() 
`comedi_8254_init()` and `comedi_8254_mm_init()` return `NULL` on
failure, but the failure is not necessarily due to lack of memory.
Change them to return an `ERR_PTR` value on failure and rename the
functions to make it obvious the API has changed.  `comedi_8254_init()`
has been replaced with `comedi_8254_io_alloc()`, and
`comedi_8254_mm_init()` has been replaced with `comedi_8254_mm_alloc()`.

Cc: Arnd Bergmann <arnd@kernel.org>
Cc: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Link: https://lore.kernel.org/r/20230913170712.111719-4-abbotti@mev.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-10-05 13:34:04 +02:00

512 lines
12 KiB
C
Raw Permalink Blame History

// SPDX-License-Identifier: GPL-2.0+
/*
* pcl711.c
* Comedi driver for PC-LabCard PCL-711 and AdSys ACL-8112 and compatibles
* Copyright (C) 1998 David A. Schleef <ds@schleef.org>
* Janne Jalkanen <jalkanen@cs.hut.fi>
* Eric Bunn <ebu@cs.hut.fi>
*
* COMEDI - Linux Control and Measurement Device Interface
* Copyright (C) 1998 David A. Schleef <ds@schleef.org>
*/
/*
* Driver: pcl711
* Description: Advantech PCL-711 and 711b, ADLink ACL-8112
* Devices: [Advantech] PCL-711 (pcl711), PCL-711B (pcl711b),
* [ADLink] ACL-8112HG (acl8112hg), ACL-8112DG (acl8112dg)
* Author: David A. Schleef <ds@schleef.org>
* Janne Jalkanen <jalkanen@cs.hut.fi>
* Eric Bunn <ebu@cs.hut.fi>
* Updated:
* Status: mostly complete
*
* Configuration Options:
* [0] - I/O port base
* [1] - IRQ, optional
*/
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/comedi/comedidev.h>
#include <linux/comedi/comedi_8254.h>
/*
* I/O port register map
*/
#define PCL711_TIMER_BASE 0x00
#define PCL711_AI_LSB_REG 0x04
#define PCL711_AI_MSB_REG 0x05
#define PCL711_AI_MSB_DRDY BIT(4)
#define PCL711_AO_LSB_REG(x) (0x04 + ((x) * 2))
#define PCL711_AO_MSB_REG(x) (0x05 + ((x) * 2))
#define PCL711_DI_LSB_REG 0x06
#define PCL711_DI_MSB_REG 0x07
#define PCL711_INT_STAT_REG 0x08
#define PCL711_INT_STAT_CLR (0 << 0) /* any value will work */
#define PCL711_AI_GAIN_REG 0x09
#define PCL711_AI_GAIN(x) (((x) & 0xf) << 0)
#define PCL711_MUX_REG 0x0a
#define PCL711_MUX_CHAN(x) (((x) & 0xf) << 0)
#define PCL711_MUX_CS0 BIT(4)
#define PCL711_MUX_CS1 BIT(5)
#define PCL711_MUX_DIFF (PCL711_MUX_CS0 | PCL711_MUX_CS1)
#define PCL711_MODE_REG 0x0b
#define PCL711_MODE(x) (((x) & 0x7) << 0)
#define PCL711_MODE_DEFAULT PCL711_MODE(0)
#define PCL711_MODE_SOFTTRIG PCL711_MODE(1)
#define PCL711_MODE_EXT PCL711_MODE(2)
#define PCL711_MODE_EXT_IRQ PCL711_MODE(3)
#define PCL711_MODE_PACER PCL711_MODE(4)
#define PCL711_MODE_PACER_IRQ PCL711_MODE(6)
#define PCL711_MODE_IRQ(x) (((x) & 0x7) << 4)
#define PCL711_SOFTTRIG_REG 0x0c
#define PCL711_SOFTTRIG (0 << 0) /* any value will work */
#define PCL711_DO_LSB_REG 0x0d
#define PCL711_DO_MSB_REG 0x0e
static const struct comedi_lrange range_pcl711b_ai = {
5, {
BIP_RANGE(5),
BIP_RANGE(2.5),
BIP_RANGE(1.25),
BIP_RANGE(0.625),
BIP_RANGE(0.3125)
}
};
static const struct comedi_lrange range_acl8112hg_ai = {
12, {
BIP_RANGE(5),
BIP_RANGE(0.5),
BIP_RANGE(0.05),
BIP_RANGE(0.005),
UNI_RANGE(10),
UNI_RANGE(1),
UNI_RANGE(0.1),
UNI_RANGE(0.01),
BIP_RANGE(10),
BIP_RANGE(1),
BIP_RANGE(0.1),
BIP_RANGE(0.01)
}
};
static const struct comedi_lrange range_acl8112dg_ai = {
9, {
BIP_RANGE(5),
BIP_RANGE(2.5),
BIP_RANGE(1.25),
BIP_RANGE(0.625),
UNI_RANGE(10),
UNI_RANGE(5),
UNI_RANGE(2.5),
UNI_RANGE(1.25),
BIP_RANGE(10)
}
};
struct pcl711_board {
const char *name;
int n_aichan;
int n_aochan;
int maxirq;
const struct comedi_lrange *ai_range_type;
};
static const struct pcl711_board boardtypes[] = {
{
.name = "pcl711",
.n_aichan = 8,
.n_aochan = 1,
.ai_range_type = &range_bipolar5,
}, {
.name = "pcl711b",
.n_aichan = 8,
.n_aochan = 1,
.maxirq = 7,
.ai_range_type = &range_pcl711b_ai,
}, {
.name = "acl8112hg",
.n_aichan = 16,
.n_aochan = 2,
.maxirq = 15,
.ai_range_type = &range_acl8112hg_ai,
}, {
.name = "acl8112dg",
.n_aichan = 16,
.n_aochan = 2,
.maxirq = 15,
.ai_range_type = &range_acl8112dg_ai,
},
};
static void pcl711_ai_set_mode(struct comedi_device *dev, unsigned int mode)
{
/*
* The pcl711b board uses bits in the mode register to select the
* interrupt. The other boards supported by this driver all use
* jumpers on the board.
*
* Enables the interrupt when needed on the pcl711b board. These
* bits do nothing on the other boards.
*/
if (mode == PCL711_MODE_EXT_IRQ || mode == PCL711_MODE_PACER_IRQ)
mode |= PCL711_MODE_IRQ(dev->irq);
outb(mode, dev->iobase + PCL711_MODE_REG);
}
static unsigned int pcl711_ai_get_sample(struct comedi_device *dev,
struct comedi_subdevice *s)
{
unsigned int val;
val = inb(dev->iobase + PCL711_AI_MSB_REG) << 8;
val |= inb(dev->iobase + PCL711_AI_LSB_REG);
return val & s->maxdata;
}
static int pcl711_ai_cancel(struct comedi_device *dev,
struct comedi_subdevice *s)
{
outb(PCL711_INT_STAT_CLR, dev->iobase + PCL711_INT_STAT_REG);
pcl711_ai_set_mode(dev, PCL711_MODE_SOFTTRIG);
return 0;
}
static irqreturn_t pcl711_interrupt(int irq, void *d)
{
struct comedi_device *dev = d;
struct comedi_subdevice *s = dev->read_subdev;
struct comedi_cmd *cmd = &s->async->cmd;
unsigned short data;
if (!dev->attached) {
dev_err(dev->class_dev, "spurious interrupt\n");
return IRQ_HANDLED;
}
data = pcl711_ai_get_sample(dev, s);
outb(PCL711_INT_STAT_CLR, dev->iobase + PCL711_INT_STAT_REG);
comedi_buf_write_samples(s, &data, 1);
if (cmd->stop_src == TRIG_COUNT &&
s->async->scans_done >= cmd->stop_arg)
s->async->events |= COMEDI_CB_EOA;
comedi_handle_events(dev, s);
return IRQ_HANDLED;
}
static void pcl711_set_changain(struct comedi_device *dev,
struct comedi_subdevice *s,
unsigned int chanspec)
{
unsigned int chan = CR_CHAN(chanspec);
unsigned int range = CR_RANGE(chanspec);
unsigned int aref = CR_AREF(chanspec);
unsigned int mux = 0;
outb(PCL711_AI_GAIN(range), dev->iobase + PCL711_AI_GAIN_REG);
if (s->n_chan > 8) {
/* Select the correct MPC508A chip */
if (aref == AREF_DIFF) {
chan &= 0x7;
mux |= PCL711_MUX_DIFF;
} else {
if (chan < 8)
mux |= PCL711_MUX_CS0;
else
mux |= PCL711_MUX_CS1;
}
}
outb(mux | PCL711_MUX_CHAN(chan), dev->iobase + PCL711_MUX_REG);
}
static int pcl711_ai_eoc(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned long context)
{
unsigned int status;
status = inb(dev->iobase + PCL711_AI_MSB_REG);
if ((status & PCL711_AI_MSB_DRDY) == 0)
return 0;
return -EBUSY;
}
static int pcl711_ai_insn_read(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned int *data)
{
int ret;
int i;
pcl711_set_changain(dev, s, insn->chanspec);
pcl711_ai_set_mode(dev, PCL711_MODE_SOFTTRIG);
for (i = 0; i < insn->n; i++) {
outb(PCL711_SOFTTRIG, dev->iobase + PCL711_SOFTTRIG_REG);
ret = comedi_timeout(dev, s, insn, pcl711_ai_eoc, 0);
if (ret)
return ret;
data[i] = pcl711_ai_get_sample(dev, s);
}
return insn->n;
}
static int pcl711_ai_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_TIMER | TRIG_EXT);
err |= comedi_check_trigger_src(&cmd->convert_src, TRIG_NOW);
err |= comedi_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
err |= comedi_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE);
if (err)
return 1;
/* Step 2a : make sure trigger sources are unique */
err |= comedi_check_trigger_is_unique(cmd->scan_begin_src);
err |= comedi_check_trigger_is_unique(cmd->stop_src);
/* Step 2b : and mutually compatible */
if (err)
return 2;
/* Step 3: check if arguments are trivially valid */
err |= comedi_check_trigger_arg_is(&cmd->start_arg, 0);
if (cmd->scan_begin_src == TRIG_EXT) {
err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, 0);
} else {
#define MAX_SPEED 1000
err |= comedi_check_trigger_arg_min(&cmd->scan_begin_arg,
MAX_SPEED);
}
err |= comedi_check_trigger_arg_is(&cmd->convert_arg, 0);
err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg,
cmd->chanlist_len);
if (cmd->stop_src == TRIG_COUNT)
err |= comedi_check_trigger_arg_min(&cmd->stop_arg, 1);
else /* TRIG_NONE */
err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0);
if (err)
return 3;
/* step 4 */
if (cmd->scan_begin_src == TRIG_TIMER) {
unsigned int arg = cmd->scan_begin_arg;
comedi_8254_cascade_ns_to_timer(dev->pacer, &arg, cmd->flags);
err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, arg);
}
if (err)
return 4;
return 0;
}
static int pcl711_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
{
struct comedi_cmd *cmd = &s->async->cmd;
pcl711_set_changain(dev, s, cmd->chanlist[0]);
if (cmd->scan_begin_src == TRIG_TIMER) {
comedi_8254_update_divisors(dev->pacer);
comedi_8254_pacer_enable(dev->pacer, 1, 2, true);
outb(PCL711_INT_STAT_CLR, dev->iobase + PCL711_INT_STAT_REG);
pcl711_ai_set_mode(dev, PCL711_MODE_PACER_IRQ);
} else {
pcl711_ai_set_mode(dev, PCL711_MODE_EXT_IRQ);
}
return 0;
}
static void pcl711_ao_write(struct comedi_device *dev,
unsigned int chan, unsigned int val)
{
outb(val & 0xff, dev->iobase + PCL711_AO_LSB_REG(chan));
outb((val >> 8) & 0xff, dev->iobase + PCL711_AO_MSB_REG(chan));
}
static int pcl711_ao_insn_write(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned int *data)
{
unsigned int chan = CR_CHAN(insn->chanspec);
unsigned int val = s->readback[chan];
int i;
for (i = 0; i < insn->n; i++) {
val = data[i];
pcl711_ao_write(dev, chan, val);
}
s->readback[chan] = val;
return insn->n;
}
static int pcl711_di_insn_bits(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned int *data)
{
unsigned int val;
val = inb(dev->iobase + PCL711_DI_LSB_REG);
val |= (inb(dev->iobase + PCL711_DI_MSB_REG) << 8);
data[1] = val;
return insn->n;
}
static int pcl711_do_insn_bits(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned int *data)
{
unsigned int mask;
mask = comedi_dio_update_state(s, data);
if (mask) {
if (mask & 0x00ff)
outb(s->state & 0xff, dev->iobase + PCL711_DO_LSB_REG);
if (mask & 0xff00)
outb((s->state >> 8), dev->iobase + PCL711_DO_MSB_REG);
}
data[1] = s->state;
return insn->n;
}
static int pcl711_attach(struct comedi_device *dev, struct comedi_devconfig *it)
{
const struct pcl711_board *board = dev->board_ptr;
struct comedi_subdevice *s;
int ret;
ret = comedi_request_region(dev, it->options[0], 0x10);
if (ret)
return ret;
if (it->options[1] && it->options[1] <= board->maxirq) {
ret = request_irq(it->options[1], pcl711_interrupt, 0,
dev->board_name, dev);
if (ret == 0)
dev->irq = it->options[1];
}
dev->pacer = comedi_8254_io_alloc(dev->iobase + PCL711_TIMER_BASE,
I8254_OSC_BASE_2MHZ, I8254_IO8, 0);
if (IS_ERR(dev->pacer))
return PTR_ERR(dev->pacer);
ret = comedi_alloc_subdevices(dev, 4);
if (ret)
return ret;
/* Analog Input subdevice */
s = &dev->subdevices[0];
s->type = COMEDI_SUBD_AI;
s->subdev_flags = SDF_READABLE | SDF_GROUND;
if (board->n_aichan > 8)
s->subdev_flags |= SDF_DIFF;
s->n_chan = board->n_aichan;
s->maxdata = 0xfff;
s->range_table = board->ai_range_type;
s->insn_read = pcl711_ai_insn_read;
if (dev->irq) {
dev->read_subdev = s;
s->subdev_flags |= SDF_CMD_READ;
s->len_chanlist = 1;
s->do_cmdtest = pcl711_ai_cmdtest;
s->do_cmd = pcl711_ai_cmd;
s->cancel = pcl711_ai_cancel;
}
/* Analog Output subdevice */
s = &dev->subdevices[1];
s->type = COMEDI_SUBD_AO;
s->subdev_flags = SDF_WRITABLE;
s->n_chan = board->n_aochan;
s->maxdata = 0xfff;
s->range_table = &range_bipolar5;
s->insn_write = pcl711_ao_insn_write;
ret = comedi_alloc_subdev_readback(s);
if (ret)
return ret;
/* Digital Input subdevice */
s = &dev->subdevices[2];
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 = pcl711_di_insn_bits;
/* Digital Output subdevice */
s = &dev->subdevices[3];
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 = pcl711_do_insn_bits;
/* clear DAC */
pcl711_ao_write(dev, 0, 0x0);
pcl711_ao_write(dev, 1, 0x0);
return 0;
}
static struct comedi_driver pcl711_driver = {
.driver_name = "pcl711",
.module = THIS_MODULE,
.attach = pcl711_attach,
.detach = comedi_legacy_detach,
.board_name = &boardtypes[0].name,
.num_names = ARRAY_SIZE(boardtypes),
.offset = sizeof(struct pcl711_board),
};
module_comedi_driver(pcl711_driver);
MODULE_AUTHOR("Comedi https://www.comedi.org");
MODULE_DESCRIPTION("Comedi driver for PCL-711 compatible boards");
MODULE_LICENSE("GPL");
Reference in New Issue View Git Blame Copy Permalink