From 1de02225358988e8fd48d1dc3fd12336bbae258a Mon Sep 17 00:00:00 2001 From: H Hartley Sweeten Date: Fri, 22 Jun 2012 16:28:33 -0700 Subject: [PATCH] staging: comedi: ni_daq_700: remove the CALLBACK_* code This driver was originally copied from the 8255 driver. The 8255 uses a callback function to handle the io operations to the device. In this driver, the callback adds unneeded complexity. The CALLBACK_ARG for this driver is always 'dev->iobase' and the CALLBACK_FUNC is always 'subdev_700_cb'. The callback function is also overly complex for this driver. It takes a 'dir' parameter to determine if the io is a write or read, a 'port' parameter that is not used, a 'data' parameter that is only used for writes, and an 'arg' which is the iobase of the device. Unwind all of it and just put the outb()/inb() call in the code where needed. This allows getting rid of the private data completely. Refactor the code based on it's removal. Signed-off-by: H Hartley Sweeten Cc: Ian Abbott Cc: Frank Mori Hess Signed-off-by: Greg Kroah-Hartman --- drivers/staging/comedi/drivers/ni_daq_700.c | 46 ++--------------------------- 1 file changed, 2 insertions(+), 44 deletions(-) diff --git a/drivers/staging/comedi/drivers/ni_daq_700.c b/drivers/staging/comedi/drivers/ni_daq_700.c index 525f076..59f7632 100644 --- a/drivers/staging/comedi/drivers/ni_daq_700.c +++ b/drivers/staging/comedi/drivers/ni_daq_700.c @@ -66,28 +66,6 @@ struct dio700_board { #define DIO_W 0x04 #define DIO_R 0x05 -struct subdev_700_struct { - unsigned long cb_arg; - int (*cb_func) (int, int, int, unsigned long); -}; - -#define CALLBACK_ARG (((struct subdev_700_struct *)s->private)->cb_arg) -#define CALLBACK_FUNC (((struct subdev_700_struct *)s->private)->cb_func) -#define subdevpriv ((struct subdev_700_struct *)s->private) - -static int subdev_700_cb(int dir, int port, int data, unsigned long arg) -{ - /* port is always A for output and B for input (8255 emu) */ - unsigned long iobase = arg; - - if (dir) { - outb(data, iobase + DIO_W); - return 0; - } else { - return inb(iobase + DIO_R); - } -} - static int subdev_700_insn(struct comedi_device *dev, struct comedi_subdevice *s, struct comedi_insn *insn, unsigned int *data) @@ -97,12 +75,11 @@ static int subdev_700_insn(struct comedi_device *dev, s->state |= (data[0] & data[1]); if (data[0] & 0xff) - CALLBACK_FUNC(1, _700_DATA, s->state & 0xff, - CALLBACK_ARG); + outb(s->state & 0xff, dev->iobase + DIO_W); } data[1] = s->state & 0xff; - data[1] |= CALLBACK_FUNC(0, _700_DATA, 0, CALLBACK_ARG) << 8; + data[1] |= inb(dev->iobase + DIO_R); return insn->n; } @@ -142,16 +119,6 @@ static int subdev_700_init(struct comedi_device *dev, s->range_table = &range_digital; s->maxdata = 1; - s->private = kmalloc(sizeof(struct subdev_700_struct), GFP_KERNEL); - if (!s->private) - return -ENOMEM; - - CALLBACK_ARG = arg; - if (cb == NULL) - CALLBACK_FUNC = subdev_700_cb; - else - CALLBACK_FUNC = cb; - s->insn_bits = subdev_700_insn; s->insn_config = subdev_700_insn_config; @@ -161,13 +128,6 @@ static int subdev_700_init(struct comedi_device *dev, return 0; } -static void subdev_700_cleanup(struct comedi_device *dev, - struct comedi_subdevice *s) -{ - if (s->private) - kfree(s->private); -} - static int dio700_attach(struct comedi_device *dev, struct comedi_devconfig *it) { const struct dio700_board *thisboard = comedi_board(dev); @@ -224,8 +184,6 @@ static int dio700_attach(struct comedi_device *dev, struct comedi_devconfig *it) static void dio700_detach(struct comedi_device *dev) { - if (dev->subdevices) - subdev_700_cleanup(dev, dev->subdevices + 0); if (dev->irq) free_irq(dev->irq, dev); }; -- 2.7.4