#include <linux/comedi/comedi_8255.h>
struct subdev_8255_private {
- unsigned long regbase;
+ unsigned long context;
int (*io)(struct comedi_device *dev, int dir, int port, int data,
- unsigned long regbase);
+ unsigned long context);
};
static int subdev_8255_io(struct comedi_device *dev,
unsigned int *data)
{
struct subdev_8255_private *spriv = s->private;
- unsigned long regbase = spriv->regbase;
+ unsigned long context = spriv->context;
unsigned int mask;
unsigned int v;
if (mask) {
if (mask & 0xff)
spriv->io(dev, 1, I8255_DATA_A_REG,
- s->state & 0xff, regbase);
+ s->state & 0xff, context);
if (mask & 0xff00)
spriv->io(dev, 1, I8255_DATA_B_REG,
- (s->state >> 8) & 0xff, regbase);
+ (s->state >> 8) & 0xff, context);
if (mask & 0xff0000)
spriv->io(dev, 1, I8255_DATA_C_REG,
- (s->state >> 16) & 0xff, regbase);
+ (s->state >> 16) & 0xff, context);
}
- 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);
+ v = spriv->io(dev, 0, I8255_DATA_A_REG, 0, context);
+ v |= (spriv->io(dev, 0, I8255_DATA_B_REG, 0, context) << 8);
+ v |= (spriv->io(dev, 0, I8255_DATA_C_REG, 0, context) << 16);
data[1] = v;
struct comedi_subdevice *s)
{
struct subdev_8255_private *spriv = s->private;
- unsigned long regbase = spriv->regbase;
+ unsigned long context = spriv->context;
int config;
config = I8255_CTRL_CW;
if (!(s->io_bits & 0xf00000))
config |= I8255_CTRL_C_HI_IO;
- spriv->io(dev, 1, I8255_CTRL_REG, config, regbase);
+ spriv->io(dev, 1, I8255_CTRL_REG, config, context);
}
static int subdev_8255_insn_config(struct comedi_device *dev,
struct comedi_subdevice *s,
int (*io)(struct comedi_device *dev,
int dir, int port, int data,
- unsigned long regbase),
- unsigned long regbase,
- bool is_mmio)
+ unsigned long context),
+ unsigned long context)
{
struct subdev_8255_private *spriv;
+ if (!io)
+ return -EINVAL;
+
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;
+ spriv->context = context;
s->type = COMEDI_SUBD_DIO;
s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
}
/**
- * subdev_8255_init - initialize DIO subdevice for driving I/O mapped 8255
+ * subdev_8255_io_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
+ * @regbase: offset of 8255 registers from dev->iobase
*
* 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, int dir, int port,
- * int data, unsigned long regbase);
- *
- * where 'dev', 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 *dev, int dir, int port,
- int data, unsigned long regbase),
+int subdev_8255_io_init(struct comedi_device *dev, struct comedi_subdevice *s,
unsigned long regbase)
{
- return __subdev_8255_init(dev, s, io, regbase, false);
+ return __subdev_8255_init(dev, s, subdev_8255_io, regbase);
}
-EXPORT_SYMBOL_GPL(subdev_8255_init);
+EXPORT_SYMBOL_GPL(subdev_8255_io_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
+ * @regbase: offset of 8255 registers from dev->mmio
*
* 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:
+ * Return: -ENOMEM if failed to allocate memory, zero on success.
+ */
+int subdev_8255_mm_init(struct comedi_device *dev, struct comedi_subdevice *s,
+ unsigned long regbase)
+{
+ return __subdev_8255_init(dev, s, subdev_8255_mmio, regbase);
+}
+EXPORT_SYMBOL_GPL(subdev_8255_mm_init);
+
+/**
+ * subdev_8255_cb_init - initialize DIO subdevice for driving callback-mapped 8255
+ * @dev: comedi device owning subdevice
+ * @s: comedi subdevice to initialize
+ * @io: register I/O call-back function
+ * @context: call-back context
+ *
+ * Initializes a comedi subdevice as a DIO subdevice driving an 8255 chip.
+ *
+ * The prototype of the I/O call-back function is of the following form:
*
* int my_8255_callback(struct comedi_device *dev, int dir, int port,
- * int data, unsigned long regbase);
+ * int data, unsigned long context);
*
- * where 'dev', and 'regbase' match the values passed to this function,
+ * where 'dev', and 'context' 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 subdev_8255_cb_init(struct comedi_device *dev, struct comedi_subdevice *s,
int (*io)(struct comedi_device *dev, int dir, int port,
- int data, unsigned long regbase),
- unsigned long regbase)
+ int data, unsigned long context),
+ unsigned long context)
{
- return __subdev_8255_init(dev, s, io, regbase, true);
+ return __subdev_8255_init(dev, s, io, context);
}
-EXPORT_SYMBOL_GPL(subdev_8255_mm_init);
+EXPORT_SYMBOL_GPL(subdev_8255_cb_init);
/**
* subdev_8255_regbase - get offset of 8255 registers or call-back context
* @s: comedi subdevice
*
- * Returns the 'regbase' parameter that was previously passed to
- * subdev_8255_init() or subdev_8255_mm_init() to set up the subdevice.
- * Only valid if the subdevice was set up successfully.
+ * Returns the 'regbase' or 'context' parameter that was previously passed to
+ * subdev_8255_io_init(), subdev_8255_mm_init(), or subdev_8255_cb_init() to
+ * set up the subdevice. Only valid if the subdevice was set up successfully.
*/
unsigned long subdev_8255_regbase(struct comedi_subdevice *s)
{
struct subdev_8255_private *spriv = s->private;
- return spriv->regbase;
+ return spriv->context;
}
EXPORT_SYMBOL_GPL(subdev_8255_regbase);
projects / linux-2.6-microblaze.git / commitdiff