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staging: comedi: quatech_daqp_cs: store private data in the comedi_device 

All the comedi_subdevices in this driver use the same 'local' private data.
Instead of storing the pointer to the private data in each subdevice, just
store it in the comedi_device.

Also, instead of passing the private data pointer to pcmcia_request_irq()
in link->priv, pass the comedi_device pointer. This allows removing the
comedi_device and comedi_subdevice pointers from the private data. We can
get them as needed from the void * in the interrupt function.

Fix the pcmcia suspend/resume functions so they use the comedi_device
pointer stored in link->priv to then get the private data pointer.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
H Hartley Sweeten 2013-02-04 16:42:56 -07:00 committed by Greg Kroah-Hartman
parent 9c1dcce9c6
commit c12717423e
1 changed files with 21 additions and 25 deletions
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46
drivers/staging/comedi/drivers/quatech_daqp_cs.c
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@ -68,8 +68,6 @@ struct local_info_t {
struct completion eos;
struct comedi_device *dev;
struct comedi_subdevice *s;
int count;
};
@ -169,7 +167,7 @@ static const struct comedi_lrange range_daqp_ai = {
static int daqp_ai_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
{
struct local_info_t *local = s->private;
struct local_info_t *local = dev->private;
if (local->stop)
return -EIO;
@ -196,13 +194,13 @@ static int daqp_ai_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
*/
static enum irqreturn daqp_interrupt(int irq, void *dev_id)
{
struct local_info_t *local = dev_id;
struct comedi_device *dev = local ? local->dev : NULL;
struct comedi_subdevice *s = local ? local->s : NULL;
struct comedi_device *dev = dev_id;
struct local_info_t *local = dev->private;
struct comedi_subdevice *s = dev->read_subdev;
int loop_limit = 10000;
int status;
if (!dev || !dev->attached || !s || s->private != local)
if (!dev->attached)
return IRQ_NONE;
switch (local->interrupt_mode) {
@ -270,7 +268,7 @@ static int daqp_ai_insn_read(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn, unsigned int *data)
{
struct local_info_t *local = s->private;
struct local_info_t *local = dev->private;
int i;
int v;
int counter = 10000;
@ -327,8 +325,6 @@ static int daqp_ai_insn_read(struct comedi_device *dev,
init_completion(&local->eos);
local->interrupt_mode = semaphore;
local->dev = dev;
local->s = s;
for (i = 0; i < insn->n; i++) {
@ -463,7 +459,7 @@ static int daqp_ai_cmdtest(struct comedi_device *dev,
static int daqp_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
{
struct local_info_t *local = s->private;
struct local_info_t *local = dev->private;
struct comedi_cmd *cmd = &s->async->cmd;
int counter;
int scanlist_start_on_every_entry;
@ -649,8 +645,6 @@ static int daqp_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
}
local->interrupt_mode = buffer;
local->dev = dev;
local->s = s;
/* Start conversion */
outb(DAQP_COMMAND_ARM | DAQP_COMMAND_FIFO_DATA,
@ -665,7 +659,7 @@ static int daqp_ao_insn_write(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn, unsigned int *data)
{
struct local_info_t *local = s->private;
struct local_info_t *local = dev->private;
int d;
unsigned int chan;
@ -692,7 +686,7 @@ static int daqp_di_insn_read(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn, unsigned int *data)
{
struct local_info_t *local = s->private;
struct local_info_t *local = dev->private;
if (local->stop)
return -EIO;
@ -708,7 +702,7 @@ static int daqp_do_insn_write(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn, unsigned int *data)
{
struct local_info_t *local = s->private;
struct local_info_t *local = dev->private;
if (local->stop)
return -EIO;
@ -732,6 +726,7 @@ static int daqp_auto_attach(struct comedi_device *dev,
local = kzalloc(sizeof(*local), GFP_KERNEL);
if (!local)
return -ENOMEM;
dev->private = local;
link->config_flags |= CONF_AUTO_SET_IO | CONF_ENABLE_IRQ;
ret = comedi_pcmcia_enable(dev);
@ -739,7 +734,7 @@ static int daqp_auto_attach(struct comedi_device *dev,
return ret;
dev->iobase = link->resource[0]->start;
link->priv = local;
link->priv = dev;
ret = pcmcia_request_irq(link, daqp_interrupt);
if (ret)
return ret;
@ -750,7 +745,6 @@ static int daqp_auto_attach(struct comedi_device *dev,
s = &dev->subdevices[0];
dev->read_subdev = s;
s->private = local;
s->type = COMEDI_SUBD_AI;
s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_DIFF | SDF_CMD_READ;
s->n_chan = 8;
@ -763,7 +757,6 @@ static int daqp_auto_attach(struct comedi_device *dev,
s->cancel = daqp_ai_cancel;
s = &dev->subdevices[1];
s->private = local;
s->type = COMEDI_SUBD_AO;
s->subdev_flags = SDF_WRITEABLE;
s->n_chan = 2;
@ -772,14 +765,12 @@ static int daqp_auto_attach(struct comedi_device *dev,
s->insn_write = daqp_ao_insn_write;
s = &dev->subdevices[2];
s->private = local;
s->type = COMEDI_SUBD_DI;
s->subdev_flags = SDF_READABLE;
s->n_chan = 1;
s->insn_read = daqp_di_insn_read;
s = &dev->subdevices[3];
s->private = local;
s->type = COMEDI_SUBD_DO;
s->subdev_flags = SDF_WRITEABLE;
s->n_chan = 1;
@ -798,18 +789,23 @@ static struct comedi_driver driver_daqp = {
static int daqp_cs_suspend(struct pcmcia_device *link)
{
struct local_info_t *local = link->priv;
struct comedi_device *dev = link->priv;
struct local_info_t *local = dev ? dev->private : NULL;
/* Mark the device as stopped, to block IO until later */
local->stop = 1;
if (local)
local->stop = 1;
return 0;
}
static int daqp_cs_resume(struct pcmcia_device *link)
{
struct local_info_t *local = link->priv;
struct comedi_device *dev = link->priv;
struct local_info_t *local = dev ? dev->private : NULL;
local->stop = 0;
if (local)
local->stop = 0;
return 0;
}