#include "8255.h"
-struct subdev_8255_private {
- unsigned long regbase;
- int (*io)(struct comedi_device *, int, int, int, unsigned long);
-};
-
-static int subdev_8255_io(struct comedi_device *dev,
- int dir, int port, int data, unsigned long regbase)
-{
- if (dir) {
- outb(data, dev->iobase + regbase + port);
- return 0;
- }
- return inb(dev->iobase + regbase + port);
-}
-
-static int subdev_8255_mmio(struct comedi_device *dev,
- int dir, int port, int data, unsigned long regbase)
-{
- if (dir) {
- writeb(data, dev->mmio + regbase + port);
- return 0;
- }
- return readb(dev->mmio + regbase + port);
-}
-
-static int subdev_8255_insn(struct comedi_device *dev,
- struct comedi_subdevice *s,
- struct comedi_insn *insn,
- unsigned int *data)
-{
- struct subdev_8255_private *spriv = s->private;
- unsigned long regbase = spriv->regbase;
- unsigned int mask;
- unsigned int v;
-
- mask = comedi_dio_update_state(s, data);
- if (mask) {
- if (mask & 0xff)
- spriv->io(dev, 1, I8255_DATA_A_REG,
- s->state & 0xff, regbase);
- if (mask & 0xff00)
- spriv->io(dev, 1, I8255_DATA_B_REG,
- (s->state >> 8) & 0xff, regbase);
- if (mask & 0xff0000)
- spriv->io(dev, 1, I8255_DATA_C_REG,
- (s->state >> 16) & 0xff, regbase);
- }
-
- v = spriv->io(dev, 0, I8255_DATA_A_REG, 0, regbase);
- v |= (spriv->io(dev, 0, I8255_DATA_B_REG, 0, regbase) << 8);
- v |= (spriv->io(dev, 0, I8255_DATA_C_REG, 0, regbase) << 16);
-
- data[1] = v;
-
- return insn->n;
-}
-
-static void subdev_8255_do_config(struct comedi_device *dev,
- struct comedi_subdevice *s)
-{
- struct subdev_8255_private *spriv = s->private;
- unsigned long regbase = spriv->regbase;
- int config;
-
- config = I8255_CTRL_CW;
- /* 1 in io_bits indicates output, 1 in config indicates input */
- if (!(s->io_bits & 0x0000ff))
- config |= I8255_CTRL_A_IO;
- if (!(s->io_bits & 0x00ff00))
- config |= I8255_CTRL_B_IO;
- if (!(s->io_bits & 0x0f0000))
- config |= I8255_CTRL_C_LO_IO;
- if (!(s->io_bits & 0xf00000))
- config |= I8255_CTRL_C_HI_IO;
-
- spriv->io(dev, 1, I8255_CTRL_REG, config, regbase);
-}
-
-static int subdev_8255_insn_config(struct comedi_device *dev,
- struct comedi_subdevice *s,
- struct comedi_insn *insn,
- unsigned int *data)
-{
- unsigned int chan = CR_CHAN(insn->chanspec);
- unsigned int mask;
- int ret;
-
- if (chan < 8)
- mask = 0x0000ff;
- else if (chan < 16)
- mask = 0x00ff00;
- else if (chan < 20)
- mask = 0x0f0000;
- else
- mask = 0xf00000;
-
- ret = comedi_dio_insn_config(dev, s, insn, data, mask);
- if (ret)
- return ret;
-
- subdev_8255_do_config(dev, s);
-
- return insn->n;
-}
-
-static int __subdev_8255_init(struct comedi_device *dev,
- struct comedi_subdevice *s,
- int (*io)(struct comedi_device *,
- int, int, int, unsigned long),
- unsigned long regbase,
- bool is_mmio)
-{
- struct subdev_8255_private *spriv;
-
- spriv = comedi_alloc_spriv(s, sizeof(*spriv));
- if (!spriv)
- return -ENOMEM;
-
- if (io)
- spriv->io = io;
- else if (is_mmio)
- spriv->io = subdev_8255_mmio;
- else
- spriv->io = subdev_8255_io;
- spriv->regbase = regbase;
-
- s->type = COMEDI_SUBD_DIO;
- s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
- s->n_chan = 24;
- s->range_table = &range_digital;
- s->maxdata = 1;
- s->insn_bits = subdev_8255_insn;
- s->insn_config = subdev_8255_insn_config;
-
- subdev_8255_do_config(dev, s);
-
- return 0;
-}
-
-/**
- * subdev_8255_init - initialize DIO subdevice for driving I/O mapped 8255
- * @dev: comedi device owning subdevice
- * @s: comedi subdevice to initialize
- * @io: (optional) register I/O call-back function
- * @regbase: offset of 8255 registers from dev->iobase, or call-back context
- *
- * Initializes a comedi subdevice as a DIO subdevice driving an 8255 chip.
- *
- * If the optional I/O call-back function is provided, its prototype is of
- * the following form:
- *
- * int my_8255_callback(struct comedi_device *dev,
- * struct comedi_subdevice *s, int dir, int port,
- * int data, unsigned long regbase);
- *
- * where 'dev', 's', and 'regbase' match the values passed to this function,
- * 'port' is the 8255 port number 0 to 3 (including the control port), 'dir'
- * is the direction (0 for read, 1 for write) and 'data' is the value to be
- * written. It should return 0 if writing or the value read if reading.
- *
- * If the optional I/O call-back function is not provided, an internal
- * call-back function is used which uses consecutive I/O port addresses
- * starting at dev->iobase + regbase.
- *
- * Return: -ENOMEM if failed to allocate memory, zero on success.
- */
-int subdev_8255_init(struct comedi_device *dev, struct comedi_subdevice *s,
- int (*io)(struct comedi_device *,
- int, int, int, unsigned long),
- unsigned long regbase)
-{
- return __subdev_8255_init(dev, s, io, regbase, false);
-}
-EXPORT_SYMBOL_GPL(subdev_8255_init);
-
-/**
- * subdev_8255_mm_init - initialize DIO subdevice for driving mmio-mapped 8255
- * @dev: comedi device owning subdevice
- * @s: comedi subdevice to initialize
- * @io: (optional) register I/O call-back function
- * @regbase: offset of 8255 registers from dev->mmio, or call-back context
- *
- * Initializes a comedi subdevice as a DIO subdevice driving an 8255 chip.
- *
- * If the optional I/O call-back function is provided, its prototype is of
- * the following form:
- *
- * int my_8255_callback(struct comedi_device *dev,
- * struct comedi_subdevice *s, int dir, int port,
- * int data, unsigned long regbase);
- *
- * where 'dev', 's', and 'regbase' match the values passed to this function,
- * 'port' is the 8255 port number 0 to 3 (including the control port), 'dir'
- * is the direction (0 for read, 1 for write) and 'data' is the value to be
- * written. It should return 0 if writing or the value read if reading.
- *
- * If the optional I/O call-back function is not provided, an internal
- * call-back function is used which uses consecutive MMIO virtual addresses
- * starting at dev->mmio + regbase.
- *
- * Return: -ENOMEM if failed to allocate memory, zero on success.
- */
-int subdev_8255_mm_init(struct comedi_device *dev, struct comedi_subdevice *s,
- int (*io)(struct comedi_device *,
- int, int, int, unsigned long),
- unsigned long regbase)
-{
- return __subdev_8255_init(dev, s, io, regbase, true);
-}
-EXPORT_SYMBOL_GPL(subdev_8255_mm_init);
-
-/*
- * Start of the 8255 standalone device
- */
-
static int dev_8255_attach(struct comedi_device *dev,
struct comedi_devconfig *it)
{
s->type = COMEDI_SUBD_UNUSED;
} else {
ret = subdev_8255_init(dev, s, NULL, iobase);
- if (ret)
+ if (ret) {
+ /*
+ * Release the I/O port region here, as the
+ * "detach" handler cannot find it.
+ */
+ release_region(iobase, I8255_SIZE);
+ s->type = COMEDI_SUBD_UNUSED;
return ret;
+ }
}
}
static void dev_8255_detach(struct comedi_device *dev)
{
struct comedi_subdevice *s;
- struct subdev_8255_private *spriv;
int i;
for (i = 0; i < dev->n_subdevices; i++) {
s = &dev->subdevices[i];
if (s->type != COMEDI_SUBD_UNUSED) {
- spriv = s->private;
- release_region(spriv->regbase, I8255_SIZE);
+ unsigned long regbase = subdev_8255_regbase(s);
+
+ release_region(regbase, I8255_SIZE);
}
}
}
module_comedi_driver(dev_8255_driver);
MODULE_AUTHOR("Comedi http://www.comedi.org");
-MODULE_DESCRIPTION("Comedi low-level driver");
+MODULE_DESCRIPTION("Comedi driver for standalone 8255 devices");
MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff