Staging: comedi: add pcm3724 driver

Driver Advantech PCM-3724 card

From: Drew Csillag <drew_csillag@yahoo.com>
Cc: David Schleef <ds@schleef.org>
Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: Frank Mori Hess <fmhess@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/staging/comedi/drivers/pcm3724.c b/drivers/staging/comedi/drivers/pcm3724.c
new file mode 100644 (file)
index 0000000..8e8015b
--- /dev/null
+++ b/drivers/staging/comedi/drivers/pcm3724.c
@@ -0,0 +1,306 @@
+/*
+    comedi/drivers/pcm724.c
+
+    Drew Csillag <drew_csillag@yahoo.com>
+
+    hardware driver for Advantech card:
+     card:   PCM-3724
+     driver: pcm3724
+
+    Options for PCM-3724
+     [0] - IO Base
+*/
+/*
+Driver: pcm3724
+Description: Advantech PCM-3724
+Author: Drew Csillag <drew_csillag@yahoo.com>
+Devices: [Advantech] PCM-3724 (pcm724)
+Status: tested
+
+This is driver for digital I/O boards PCM-3724 with 48 DIO.
+It needs 8255.o for operations and only immediate mode is supported.
+See the source for configuration details.
+
+Copy/pasted/hacked from pcm724.c
+*/
+/*
+ * check_driver overrides:
+ *   comedi_insn
+ */
+
+#include "../comedidev.h"
+
+#include <linux/ioport.h>
+#include <linux/delay.h>
+
+#include "8255.h"
+
+#define PCM3724_SIZE   16
+#define SIZE_8255      4
+
+#define BUF_C0 0x1
+#define BUF_B0 0x2
+#define BUF_A0 0x4
+#define BUF_C1 0x8
+#define BUF_B1 0x10
+#define BUF_A1 0x20
+
+#define GATE_A0 0x4
+#define GATE_B0        0x2
+#define GATE_C0        0x1
+#define GATE_A1        0x20
+#define GATE_B1        0x10
+#define GATE_C1 0x8
+
+/* from 8255.c */
+#define CR_CW          0x80
+#define _8255_CR 3
+#define CR_B_IO                0x02
+#define CR_B_MODE      0x04
+#define CR_C_IO                0x09
+#define CR_A_IO                0x10
+#define CR_A_MODE(a)   ((a)<<5)
+#define CR_CW          0x80
+
+static int pcm3724_attach(comedi_device * dev, comedi_devconfig * it);
+static int pcm3724_detach(comedi_device * dev);
+
+typedef struct {
+       const char *name;       // driver name
+       int dio;                // num of DIO
+       int numofports;         // num of 8255 subdevices
+       unsigned int IRQbits;   // allowed interrupts
+       unsigned int io_range;  // len of IO space
+} boardtype;
+
+//used to track configured dios
+typedef struct {
+       int dio_1;
+       int dio_2;
+} priv_pcm3724;
+static const boardtype boardtypes[] = {
+       {"pcm3724", 48, 2, 0x00fc, PCM3724_SIZE,},
+};
+
+#define n_boardtypes (sizeof(boardtypes)/sizeof(boardtype))
+#define this_board ((const boardtype *)dev->board_ptr)
+
+static comedi_driver driver_pcm3724 = {
+      driver_name:"pcm3724",
+      module:THIS_MODULE,
+      attach:pcm3724_attach,
+      detach:pcm3724_detach,
+      board_name:&boardtypes[0].name,
+      num_names:n_boardtypes,
+      offset:sizeof(boardtype),
+};
+
+COMEDI_INITCLEANUP(driver_pcm3724);
+
+//          (setq c-basic-offset 8)
+
+static int subdev_8255_cb(int dir, int port, int data, unsigned long arg)
+{
+       unsigned long iobase = arg;
+       unsigned char inbres;
+       //printk("8255cb %d %d %d %lx\n", dir,port,data,arg);
+       if (dir) {
+               //printk("8255 cb   outb(%x, %lx)\n", data, iobase+port);
+               outb(data, iobase + port);
+               return 0;
+       } else {
+               inbres = inb(iobase + port);
+               //printk("8255 cb   inb(%lx) = %x\n", iobase+port, inbres);
+               return inbres;
+       }
+}
+
+static int compute_buffer(int config, int devno, comedi_subdevice * s)
+{
+       /* 1 in io_bits indicates output */
+       if (s->io_bits & 0x0000ff) {
+               if (devno == 0) {
+                       config |= BUF_A0;
+               } else {
+                       config |= BUF_A1;
+               }
+       }
+       if (s->io_bits & 0x00ff00) {
+               if (devno == 0) {
+                       config |= BUF_B0;
+               } else {
+                       config |= BUF_B1;
+               }
+       }
+       if (s->io_bits & 0xff0000) {
+               if (devno == 0) {
+                       config |= BUF_C0;
+               } else {
+                       config |= BUF_C1;
+               }
+       }
+       return config;
+}
+
+static void do_3724_config(comedi_device * dev, comedi_subdevice * s,
+       int chanspec)
+{
+       int config;
+       int buffer_config;
+       unsigned long port_8255_cfg;
+
+       config = CR_CW;
+       buffer_config = 0;
+
+       /* 1 in io_bits indicates output, 1 in config indicates input */
+       if (!(s->io_bits & 0x0000ff)) {
+               config |= CR_A_IO;
+       }
+       if (!(s->io_bits & 0x00ff00)) {
+               config |= CR_B_IO;
+       }
+       if (!(s->io_bits & 0xff0000)) {
+               config |= CR_C_IO;
+       }
+
+       buffer_config = compute_buffer(0, 0, dev->subdevices);
+       buffer_config = compute_buffer(buffer_config, 1, (dev->subdevices) + 1);
+
+       if (s == dev->subdevices) {
+               port_8255_cfg = dev->iobase + _8255_CR;
+       } else {
+               port_8255_cfg = dev->iobase + SIZE_8255 + _8255_CR;
+       }
+       outb(buffer_config, dev->iobase + 8);   /* update buffer register */
+       //printk("pcm3724 buffer_config (%lx) %d, %x\n", dev->iobase + _8255_CR, chanspec, buffer_config);
+       outb(config, port_8255_cfg);
+}
+
+static void enable_chan(comedi_device * dev, comedi_subdevice * s, int chanspec)
+{
+       unsigned int mask;
+       int gatecfg;
+       priv_pcm3724 *priv;
+
+       gatecfg = 0;
+       priv = (priv_pcm3724 *) (dev->private);
+
+       mask = 1 << CR_CHAN(chanspec);
+       if (s == dev->subdevices) {     // subdev 0
+               priv->dio_1 |= mask;
+       } else {                //subdev 1
+               priv->dio_2 |= mask;
+       }
+       if (priv->dio_1 & 0xff0000) {
+               gatecfg |= GATE_C0;
+       }
+       if (priv->dio_1 & 0xff00) {
+               gatecfg |= GATE_B0;
+       }
+       if (priv->dio_1 & 0xff) {
+               gatecfg |= GATE_A0;
+       }
+       if (priv->dio_2 & 0xff0000) {
+               gatecfg |= GATE_C1;
+       }
+       if (priv->dio_2 & 0xff00) {
+               gatecfg |= GATE_B1;
+       }
+       if (priv->dio_2 & 0xff) {
+               gatecfg |= GATE_A1;
+       }
+       //      printk("gate control %x\n", gatecfg);
+       outb(gatecfg, dev->iobase + 9);
+}
+
+/* overriding the 8255 insn config */
+static int subdev_3724_insn_config(comedi_device * dev, comedi_subdevice * s,
+       comedi_insn * insn, lsampl_t * data)
+{
+       unsigned int mask;
+       unsigned int bits;
+
+       mask = 1 << CR_CHAN(insn->chanspec);
+       if (mask & 0x0000ff) {
+               bits = 0x0000ff;
+       } else if (mask & 0x00ff00) {
+               bits = 0x00ff00;
+       } else if (mask & 0x0f0000) {
+               bits = 0x0f0000;
+       } else {
+               bits = 0xf00000;
+       }
+
+       switch (data[0]) {
+       case INSN_CONFIG_DIO_INPUT:
+               s->io_bits &= ~bits;
+               break;
+       case INSN_CONFIG_DIO_OUTPUT:
+               s->io_bits |= bits;
+               break;
+       case INSN_CONFIG_DIO_QUERY:
+               data[1] = (s->io_bits & bits) ? COMEDI_OUTPUT : COMEDI_INPUT;
+               return insn->n;
+               break;
+       default:
+               return -EINVAL;
+       }
+
+       do_3724_config(dev, s, insn->chanspec);
+       enable_chan(dev, s, insn->chanspec);
+       return 1;
+}
+
+static int pcm3724_attach(comedi_device * dev, comedi_devconfig * it)
+{
+       unsigned long iobase;
+       unsigned int iorange;
+       int ret, i, n_subdevices;
+
+       iobase = it->options[0];
+       iorange = this_board->io_range;
+       if ((ret = alloc_private(dev, sizeof(priv_pcm3724))) < 0)
+               return -ENOMEM;
+
+       ((priv_pcm3724 *) (dev->private))->dio_1 = 0;
+       ((priv_pcm3724 *) (dev->private))->dio_2 = 0;
+
+       printk("comedi%d: pcm3724: board=%s, 0x%03lx ", dev->minor,
+               this_board->name, iobase);
+       if (!iobase || !request_region(iobase, iorange, "pcm3724")) {
+               printk("I/O port conflict\n");
+               return -EIO;
+       }
+
+       dev->iobase = iobase;
+       dev->board_name = this_board->name;
+       printk("\n");
+
+       n_subdevices = this_board->numofports;
+
+       if ((ret = alloc_subdevices(dev, n_subdevices)) < 0)
+               return ret;
+
+       for (i = 0; i < dev->n_subdevices; i++) {
+               subdev_8255_init(dev, dev->subdevices + i, subdev_8255_cb,
+                       (unsigned long)(dev->iobase + SIZE_8255 * i));
+               ((dev->subdevices) + i)->insn_config = subdev_3724_insn_config;
+       };
+       return 0;
+}
+
+static int pcm3724_detach(comedi_device * dev)
+{
+       int i;
+
+       if (dev->subdevices) {
+               for (i = 0; i < dev->n_subdevices; i++) {
+                       subdev_8255_cleanup(dev, dev->subdevices + i);
+               }
+       }
+       if (dev->iobase) {
+               release_region(dev->iobase, this_board->io_range);
+       }
+
+       return 0;
+}