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staging: comedi: cb_pcidas: fix cb_pcidas_eeprom_insn_read()

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The comedi core expects (*insn_read) operations to return insn->n
data values. Refactor this function to work like the core expects.

For aesthetics, nvram_read() and use the comedi_timeout() helper
to handle the busy wait for the eeprom to be "ready".

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
H Hartley Sweeten 2015-10-13 17:47:57 -07:00 committed by Greg Kroah-Hartman
parent 73d38effd1
commit 16ded01b69
1 changed files with 38 additions and 42 deletions
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80
drivers/staging/comedi/drivers/cb_pcidas.c
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@ -466,44 +466,18 @@ static int cb_pcidas_ao_fifo_winsn(struct comedi_device *dev,
return insn->n;
}
static int wait_for_nvram_ready(unsigned long s5933_base_addr)
{
static const int timeout = 1000;
unsigned int i;
for (i = 0; i < timeout; i++) {
if ((inb(s5933_base_addr +
AMCC_OP_REG_MCSR_NVCMD) & MCSR_NV_BUSY)
== 0)
return 0;
udelay(1);
}
return -1;
}
static int nvram_read(struct comedi_device *dev, unsigned int address,
u8 *data)
static int cb_pcidas_eeprom_ready(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned long context)
{
struct cb_pcidas_private *devpriv = dev->private;
unsigned long iobase = devpriv->s5933_config;
unsigned int status;
if (wait_for_nvram_ready(iobase) < 0)
return -ETIMEDOUT;
outb(MCSR_NV_ENABLE | MCSR_NV_LOAD_LOW_ADDR,
iobase + AMCC_OP_REG_MCSR_NVCMD);
outb(address & 0xff, iobase + AMCC_OP_REG_MCSR_NVDATA);
outb(MCSR_NV_ENABLE | MCSR_NV_LOAD_HIGH_ADDR,
iobase + AMCC_OP_REG_MCSR_NVCMD);
outb((address >> 8) & 0xff, iobase + AMCC_OP_REG_MCSR_NVDATA);
outb(MCSR_NV_ENABLE | MCSR_NV_READ, iobase + AMCC_OP_REG_MCSR_NVCMD);
if (wait_for_nvram_ready(iobase) < 0)
return -ETIMEDOUT;
*data = inb(iobase + AMCC_OP_REG_MCSR_NVDATA);
return 0;
status = inb(devpriv->s5933_config + AMCC_OP_REG_MCSR_NVCMD);
if ((status & MCSR_NV_BUSY) == 0)
return 0;
return -EBUSY;
}
static int cb_pcidas_eeprom_insn_read(struct comedi_device *dev,
@ -511,16 +485,38 @@ static int cb_pcidas_eeprom_insn_read(struct comedi_device *dev,
struct comedi_insn *insn,
unsigned int *data)
{
u8 nvram_data;
int retval;
struct cb_pcidas_private *devpriv = dev->private;
unsigned int chan = CR_CHAN(insn->chanspec);
int ret;
int i;
retval = nvram_read(dev, CR_CHAN(insn->chanspec), &nvram_data);
if (retval < 0)
return retval;
for (i = 0; i < insn->n; i++) {
/* make sure eeprom is ready */
ret = comedi_timeout(dev, s, insn, cb_pcidas_eeprom_ready, 0);
if (ret)
return ret;
data[0] = nvram_data;
/* set address (chan) and read operation */
outb(MCSR_NV_ENABLE | MCSR_NV_LOAD_LOW_ADDR,
devpriv->s5933_config + AMCC_OP_REG_MCSR_NVCMD);
outb(chan & 0xff,
devpriv->s5933_config + AMCC_OP_REG_MCSR_NVDATA);
outb(MCSR_NV_ENABLE | MCSR_NV_LOAD_HIGH_ADDR,
devpriv->s5933_config + AMCC_OP_REG_MCSR_NVCMD);
outb((chan >> 8) & 0xff,
devpriv->s5933_config + AMCC_OP_REG_MCSR_NVDATA);
outb(MCSR_NV_ENABLE | MCSR_NV_READ,
devpriv->s5933_config + AMCC_OP_REG_MCSR_NVCMD);
return 1;
/* wait for data to be returned */
ret = comedi_timeout(dev, s, insn, cb_pcidas_eeprom_ready, 0);
if (ret)
return ret;
data[i] = inb(devpriv->s5933_config + AMCC_OP_REG_MCSR_NVDATA);
}
return insn->n;
}
static void cb_pcidas_calib_write(struct comedi_device *dev,